U.S. patent application number 17/041385 was filed with the patent office on 2021-02-04 for indoor unit of air conditioner.
This patent application is currently assigned to DAIKIN INDUSTRIES, LTD.. The applicant listed for this patent is DAIKIN INDUSTRIES, LTD.. Invention is credited to Zuozhou CHEN, Masahito HIGASHIDA, Kaname MARUYAMA, Satoshi NAKAI, Hideshi TANAKA, Hironobu TERAOKA, Masafumi UDA.
Application Number | 20210033288 17/041385 |
Document ID | / |
Family ID | 1000005178911 |
Filed Date | 2021-02-04 |
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United States Patent
Application |
20210033288 |
Kind Code |
A1 |
TERAOKA; Hironobu ; et
al. |
February 4, 2021 |
INDOOR UNIT OF AIR CONDITIONER
Abstract
This indoor unit of an air conditioner includes an indoor unit
body including an inlet and an outlet; a heat exchanger that
performs heat exchange on air drawn in from the inlet; and a
cross-flow fan configured to blow out air, which has undergone heat
exchange performed by the heat exchanger from the outlet. The
cross-flow fan includes a blow-out flow path formed by a lower
wall, left and right side walls, and an upper wall so that a
cross-sectional area gradually increases downward, with the
blow-out flow path guiding blown-out air to the outlet. The two
side walls are arranged to project out of the outlet at least when
an air conditioning operation is performed.
Inventors: |
TERAOKA; Hironobu;
(Osaka-shi, JP) ; TANAKA; Hideshi; (Osaka-shi,
JP) ; NAKAI; Satoshi; (Osaka-shi, JP) ;
HIGASHIDA; Masahito; (Osaka-shi, JP) ; UDA;
Masafumi; (Osaka-shi, JP) ; MARUYAMA; Kaname;
(Osaka-shi, JP) ; CHEN; Zuozhou; (Osaka-shi,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
DAIKIN INDUSTRIES, LTD. |
Osaka-shi, Osaka |
|
JP |
|
|
Assignee: |
DAIKIN INDUSTRIES, LTD.
Osaka-shi, Osaka
JP
|
Family ID: |
1000005178911 |
Appl. No.: |
17/041385 |
Filed: |
February 26, 2019 |
PCT Filed: |
February 26, 2019 |
PCT NO: |
PCT/JP2019/007257 |
371 Date: |
September 24, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F24F 1/0057 20190201;
F24F 13/24 20130101; F24F 1/0025 20130101; F24F 2013/247
20130101 |
International
Class: |
F24F 1/0025 20060101
F24F001/0025; F24F 1/0057 20060101 F24F001/0057 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 30, 2018 |
JP |
2018-070195 |
Claims
1. An indoor unit of an air conditioner, comprising: an indoor unit
main body including an inlet and an outlet; a heat exchanger that
performs heat exchange on air drawn in from the inlet; and a
cross-flow fan configured to blow out air, which has undergone heat
exchange performed by the heat exchanger, from the outlet, wherein
the cross-flow fan includes a blow-out flow path formed by a lower
wall, left and right side walls, and an upper wall so that a
cross-sectional area gradually increases downward, with the
blow-out flow path guiding blown-out air to the outlet, and the two
side walls are arranged to project out of the outlet at least when
an air conditioning operation is performed.
2. The indoor unit of an air conditioner according to claim 1,
wherein the lower wall is arranged to project out of the outlet at
least when an air conditioning operation is performed.
3. The indoor unit of an air conditioner according to claim 1,
wherein the upper wall is arranged to project out of the outlet at
least when an air conditioning operation is performed.
4. The indoor unit of an air conditioner according to claim 1,
wherein the blow-out flow path is formed to project out of the
outlet and so that a distance between the two side walls in a
sideward direction in the blow-out flow path at a downstream side
of the outlet is less than a sideward length of the outlet.
5. The indoor unit of an air conditioner according to claim 1,
further comprising: a movement mechanism configured to switch
between a stored state that does not project an element forming the
blow-out flow path including the side walls out of the outlet and a
projected state that projects at least the side walls out of the
outlet, wherein the movement mechanism is in the projected state
when an air conditioning operation is performed, and the movement
mechanism is in the stored state when an air conditioning operation
is stopped.
6. The indoor unit of an air conditioner according to claim 5,
wherein when surging occurs, the movement mechanism moves the
element to decrease a cross-sectional area of the blow-out flow
path at a portion projecting from the outlet.
7. The indoor unit of an air conditioner according to claim 1,
wherein the indoor unit is configured so that a ratio (H/D) of
height H of the indoor unit main body to outer diameter D of an
impeller of the cross-flow fan is less than 2.2.
8. The indoor unit of an air conditioner according to claim 2,
wherein the upper wall is arranged to project out of the outlet at
least when an air conditioning operation is performed.
9. The indoor unit of an air conditioner according to claim 2,
wherein the blow-out flow path is formed to project out of the
outlet and so that a distance between the two side walls in a
sideward direction in the blow-out flow path at a downstream side
of the outlet is less than a sideward length of the outlet.
10. The indoor unit of an air conditioner according to claim 3,
wherein the blow-out flow path is formed to project out of the
outlet and so that a distance between the two side walls in a
sideward direction in the blow-out flow path at a downstream side
of the outlet is less than a sideward length of the outlet.
11. The indoor unit of an air conditioner according to claim 2,
further comprising: a movement mechanism configured to switch
between a stored state that does not project an element forming the
blow-out flow path including the side walls out of the outlet and a
projected state that projects at least the side walls out of the
outlet, wherein the movement mechanism is in the projected state
when an air conditioning operation is performed, and the movement
mechanism is in the stored state when an air conditioning operation
is stopped.
12. The indoor unit of an air conditioner according to claim 3,
further comprising: a movement mechanism configured to switch
between a stored state that does not project an element forming the
blow-out flow path including the side walls out of the outlet and a
projected state that projects at least the side walls out of the
outlet, wherein the movement mechanism is in the projected state
when an air conditioning operation is performed, and the movement
mechanism is in the stored state when an air conditioning operation
is stopped.
13. The indoor unit of an air conditioner according to claim 4,
further comprising: a movement mechanism configured to switch
between a stored state that does not project an element forming the
blow-out flow path including the side walls out of the outlet and a
projected state that projects at least the side walls out of the
outlet, wherein the movement mechanism is in the projected state
when an air conditioning operation is performed, and the movement
mechanism is in the stored state when an air conditioning operation
is stopped.
14. The indoor unit of an air conditioner according to claim 2,
wherein the indoor unit is configured so that a ratio (H/D) of
height H of the indoor unit main body to outer diameter D of an
impeller of the cross-flow fan is less than 2.2.
15. The indoor unit of an air conditioner according to claim 3,
wherein the indoor unit is configured so that a ratio (H/D) of
height H of the indoor unit main body to outer diameter D of an
impeller of the cross-flow fan is less than 2.2.
16. The indoor unit of an air conditioner according to claim 4,
wherein the indoor unit is configured so that a ratio (H/D) of
height H of the indoor unit main body to outer diameter D of an
impeller of the cross-flow fan is less than 2.2.
17. The indoor unit of an air conditioner according to claim 5,
wherein the indoor unit is configured so that a ratio (H/D) of
height H of the indoor unit main body to outer diameter D of an
impeller of the cross-flow fan is less than 2.2.
18. The indoor unit of an air conditioner according to claim 6,
wherein the indoor unit is configured so that a ratio (H/D) of
height H of the indoor unit main body to outer diameter D of an
impeller of the cross-flow fan is less than 2.2.
Description
TECHNICAL FIELD
[0001] The present disclosure relates to an indoor unit of an air
conditioner.
BACKGROUND ART
[0002] Patent Document 1 discloses one example of the structure of
an indoor unit of an air conditioner in which a wall portion
extends upward from a guide surface of a flap at each of two
longitudinal ends of the flap.
PRIOR ART DOCUMENT
Patent Document
[0003] Patent Document 1: International Publication No.
2014/199590
SUMMARY OF THE INVENTION
Problems that the Invention is to Solve
[0004] In the indoor unit in Patent Document 1, when the flap is
located at a position such that air blown out of an outlet is
directed downward from the indoor unit, a gap becomes large between
the side walls of the flap and the outlet. This causes the
blown-out air to flow backward between the side walls and the
outlet, which results in surging.
[0005] One objective of the present disclosure is to provide an
indoor unit of an air conditioner that reduces the occurrence of
surging.
Means for Solving the Problems
[0006] An indoor unit of an air conditioner that solves the above
problems includes an indoor unit main body, a heat exchanger, and a
cross-flow fan. The indoor unit main body includes an inlet and an
outlet. The heat exchanger performs heat exchange on air drawn in
from the inlet. The cross-flow fan is configured to blow out air,
which has undergone heat exchange performed by the heat exchanger,
from the outlet. The cross-flow fan includes a blow-out flow path
formed by a lower wall, left and right side walls, and an upper
wall so that a cross-sectional area gradually increases downward.
The blow-out flow path guides blown-out air to the outlet. The side
walls are arranged to project out of the outlet at least when an
air conditioning operation is performed.
[0007] With this structure, the side walls restrict the air blown
out of the outlet from flowing sideward from the outlet. This
allows the blow-out flow path to be extended from the outlet. In
this manner, the static pressure in the blow-out flow path is
increased to increase the air volume of the blow-out flow path is
increased. Further, when the air flow resistance (internal pressure
loss) in the indoor unit main body is high, backflow of air from
the two sideward ends of the outlet is restricted. Thus, surging is
unlikely to occur.
[0008] In the above-described indoor unit of an air conditioner, it
is preferred that the lower wall be arranged to project out of the
outlet at least when an air conditioning operation is
performed.
[0009] With this structure, the lower wall projects out of the
outlet with the two side walls. Thus, the two side walls and the
lower wall restrict the air blown out of the outlet from flowing
sideward and downward from the outlet. This allows the blow-out
flow path to be extended from the outlet. In this manner, the
blow-out flow path serving as a diffuser is lengthened compared to
a structure that does not project the two side walls and the lower
wall out of the outlet. This further increases the static pressure
in the blow-out flow path and further increases the air volume of
the blow-out flow path. Also, when the air flow resistance
(internal pressure loss) in the indoor unit main body is high,
backflow of air from the two sideward ends and the lower part of
the outlet is restricted. Thus, surging is even less likely to
occur.
[0010] In the above-described indoor unit of an air conditioner, it
is preferred that the upper wall be arranged to project out of the
outlet at least when an air conditioning operation is
performed.
[0011] With this structure, the upper wall projects out of the
outlet with the two side walls. Thus, the two side walls and the
upper wall restrict the air blown out of the outlet from flowing
sideward and upward from the outlet. This allows the blow-out flow
path to be extended from the outlet. In this manner, the blow-out
flow path serving as a diffuser is lengthened compared to a
structure that does not project the two side walls and the upper
wall out of the outlet. This further increases the static pressure
in the blow-out flow path and further increases the air volume of
the blow-out flow path. Also, when the air flow resistance
(internal pressure loss) in the indoor unit main body is high,
backflow of air from the two sideward ends and the upper part of
the outlet is restricted. Thus, surging is even less likely to
occur.
[0012] In the above-described indoor unit of an air conditioner, it
is preferred that the blow-out flow path be formed to project out
of the outlet so that a distance between the left and right side
walls in a sideward direction in the blow-out flow path at a
downstream side of the outlet is less than a sideward length of the
outlet.
[0013] With this structure, the cross-sectional area of the
blow-out flow path at a downstream side of the outlet is decreased
so that the velocity of the air in the blow-out flow path at the
downstream side of the outlet is increased. This restricts backflow
of air from the outlet. Thus, surging is even less likely to
occur.
[0014] In the above-described indoor unit of an air conditioner, it
is preferred that the indoor unit further include a movement
mechanism configured to switch between a stored state that does not
project an element forming the blow-out flow path including the
side walls out of the outlet and a projected state that projects at
least the side walls out of the outlet. Preferably, the movement
mechanism is in the projected state when an air conditioning
operation is performed and in the stored state when an air
conditioning operation is stopped.
[0015] With this structure, the blow-out flow path projects out of
the indoor unit main body when an air conditioning operation is
performed. Thus, surging is unlikely to occur. Further, the
blow-out flow path is stored in the indoor unit main body when an
air conditioning operation is stopped. Thus, the aesthetic
appearance of the indoor unit is improved.
[0016] In the above-described indoor unit of an air conditioner, it
is preferred that when surging occurs, the movement mechanism move
the element to decrease a cross-sectional area of the blow-out flow
path at a portion projecting from the outlet.
[0017] With this structure, when surging occurs, the
cross-sectional area of the blow-out flow path at a downstream side
of the outlet is decreased so that the velocity in the air in the
blow-out flow path at the downstream side of the outlet is
increased. This restricts backflow of air from the outlet thereby
impeding surging.
[0018] In the above-described indoor unit of an air conditioner, it
is preferred that the indoor unit be configured so that a ratio
(H/D) of height H of the indoor unit main body to outer diameter D
of an impeller of the cross-flow fan is less than 2.2.
[0019] With this structure, the indoor unit main body uses the
cross-flow fan including the impeller with a relatively large outer
diameter. This allows noise and power consumption to be reduced
when an air conditioning operation is performed.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] FIG. 1 shows diagrams of an indoor unit of an air
conditioner in accordance with a first embodiment, in which FIG. 1A
is a perspective view of the indoor unit in a stored state, and
FIG. 1B is a perspective view of the indoor unit in a projected
state.
[0021] FIG. 2 shows diagrams of the indoor unit in FIG. 1, in which
FIG. 2A is a cross-sectional view of the indoor unit in the stored
state, and FIG. 2B is a cross-sectional view of the indoor unit in
the projected state.
[0022] FIG. 3 is a block diagram showing the electrical structure
of the air conditioner.
[0023] FIG. 4 is a flowchart illustrating one example of a
procedure for processing movement control executed by a control
unit of the indoor unit.
[0024] FIG. 5 shows diagrams of an indoor unit of an air
conditioner in accordance with a second embodiment, in which FIG.
5A is a perspective view of the indoor unit in a stored state, and
FIG. 5B is a perspective view of the indoor unit in a projected
state.
[0025] FIG. 6 shows diagrams of the indoor unit in FIG. 5, in which
FIG. 6A is a cross-sectional view of the indoor unit in the stored
state, and FIG. 6B is a cross-sectional view of the indoor unit in
the projected state.
[0026] FIG. 7 shows diagrams of an indoor unit of an air
conditioner in accordance with a third embodiment, in which FIG. 7A
is a perspective view of the indoor unit in a stored state, and
FIG. 7B is a perspective view of the indoor unit in a projected
state.
[0027] FIG. 8 shows diagrams of the indoor unit in FIG. 7, in which
FIG. 8A is a cross-sectional view of the indoor unit in the stored
state, and FIG. 8B is a cross-sectional view of the indoor unit in
the projected state.
[0028] FIG. 9 shows diagrams of an indoor unit of an air
conditioner in accordance with a fourth embodiment, in which FIG.
9A is a cross-sectional view of the indoor unit, and FIG. 9B is an
enlarged view of a blow-out flow path and its periphery shown in
FIG. 9A.
[0029] FIG. 10 shows diagrams of an indoor unit of an air
conditioner of a modified example, in which FIG. 10A is a
perspective view of the indoor unit in a stored state, and FIG. 10B
is a perspective view of the indoor unit in a projected state.
[0030] FIG. 11 shows diagrams of an indoor unit of an air
conditioner of a modified example, in which FIG. 11A is a
perspective view of the indoor unit in a stored state, and FIG. 11B
is a perspective view of the indoor unit in a projected state.
[0031] FIG. 12 shows diagrams of an indoor unit of an air
conditioner of a modified example, in which FIG. 12A is a
perspective view of the indoor unit in a stored state, and FIG. 12B
is a perspective view of the indoor unit in a projected state.
[0032] FIG. 13 shows diagrams of an indoor unit of an air
conditioner of a modified example, in which FIG. 13A is a
cross-sectional view of the indoor unit in a stored state, and FIG.
13B is a cross-sectional view of the indoor unit in a projected
state.
[0033] FIG. 14 shows diagrams of an indoor unit of an air
conditioner of a modified example, in which FIG. 14A is a
cross-sectional view of the indoor unit in a stored state, and FIG.
14B is a cross-sectional view of the indoor unit in a projected
state.
[0034] FIG. 15 shows diagrams of an indoor unit of an air
conditioner of a modified example, in which FIG. 15A is a
perspective view of the indoor unit, and FIG. 15B is an enlarged
view of part of FIG. 15A.
MODES FOR CARRYING OUT THE INVENTION
First Embodiment
[0035] An indoor unit 1 of an air conditioner in accordance with a
first embodiment will now be described with reference to FIGS. 1
and 4.
[0036] The indoor unit 1 of the present embodiment is of a
wall-mounted type and includes a rear portion attached to an indoor
wall WL. The indoor unit 1 is, for example, configured to perform a
cooling operation that cools an indoor space and a heating
operation that heats an indoor space.
[0037] As shown in FIGS. 1 and 2, the indoor unit 1 includes an
indoor unit main body 10. The indoor unit main body 10 has the form
of a box, in which a lateral direction (sideward direction of
indoor unit 1) coincides with the longitudinal direction, and
includes an inner space surrounded by a top surface portion 11, a
front surface portion 12, a rear surface portion 13, two side
surface portions 14, and a bottom surface portion 15. The indoor
unit 1 is mounted on the wall WL by coupling the rear surface
portion 13 to a mounting panel (not shown) on the wall WL with
screws or the like. The top surface portion 11 of the indoor unit
main body 10 includes an inlet 16, and the bottom surface portion
15 includes an outlet 17. The inlet 16 and the outlet 17 are each
arranged so that the lateral direction (sideward direction)
coincides with the longitudinal direction. The inlet 16 is formed
along the top surface portion 11. The outlet 17 is formed along the
bottom surface portion 15.
[0038] As shown in FIG. 2, the indoor unit 1 includes an air filter
21, an indoor heat exchanger 22, a cross-flow fan 23, and a flap
24. The air filter 21, the indoor heat exchanger 22, and the
cross-flow fan 23 are accommodated in the indoor unit main body
10.
[0039] The air filter 21 is coupled to the indoor unit main body 10
in a removable manner. The air filter 21 removes dust from indoor
air drawn in from the inlet 16. In a state in which the air filter
21 is attached to the indoor unit main body 10, the air filter 21
is located between the top surface portion 11 and the indoor heat
exchanger 22 of the indoor unit main body 10. In this manner, the
air filter 21 limits the collection of dust, which is suspended in
the indoor air, on the surface of the indoor heat exchanger 22.
[0040] The indoor heat exchanger 22 includes a plurality of fins
and a plurality of heat transfer tubes that extend through the
fins. The indoor heat exchanger 22 serves as an evaporator or a
condenser in accordance with an operation state of the indoor unit
1 and exchanges heat between a refrigerant flowing through the heat
transfer tubes and air flowing through the indoor heat exchanger
22.
[0041] The indoor heat exchanger 22 is arranged so that its front
end and rear end are bent downward in a side view. The indoor heat
exchanger 22 is arranged to surround the cross-flow fan 23 from
above.
[0042] The cross-flow fan 23 is located inside the indoor unit main
body 10 at a substantially central portion. The cross-flow fan 23
includes an impeller 25 and a fan case 27. The impeller 25 is
substantially cylindrical and has a lateral direction (sideward
direction) that coincides with the longitudinal direction. The fan
case 27 forms a blow-out flow path 26 that extends to the outlet
17. The blow-out flow path 26 is formed by a lower wall 26L, left
and right side walls 26S, and an upper wall 26U in a manner so that
its cross-sectional area gradually increases downward. In other
words, the cross-sectional area of the blow-out flow path 26
increases toward the outlet 17. In this manner, the blow-out flow
path 26 functions as a diffuser.
[0043] When the cross-flow fan 23 is being rotated and operated,
the indoor air drawn in from the inlet 16 flows through the indoor
heat exchanger 22 to the cross-flow fan 23. Then, the indoor air
flows from the cross-flow fan 23 through the blow-out flow path 26
and is blown out of the outlet 17 into the room.
[0044] The impeller 25 of the cross-flow fan 23 has an outer
diameter D, and the rear surface portion 13 of the indoor unit main
body 10 has a vertical dimension (up-down dimension) that
corresponds to a height H of the indoor unit main body 10.
Preferably, the outer diameter D is 126 mm or greater and less than
150 mm. Further preferably, the outer diameter D is 135 mm or
greater and less than 150 mm. Preferably, the height H of the
indoor unit main body 10 is 295 mm or less. Further preferably, the
height H of the indoor unit main body 10 is 250 mm or greater and
295 mm or less. Preferably, a ratio (H/D) of the height H of the
indoor unit main body 10 to the outer diameter D is less than 2.2.
Further preferably, the ratio (H/D) of the height H of the indoor
unit main body 10 to the outer diameter D is 1.6 or greater and
less than 2.2.
[0045] The flap 24 is arranged at a lower edge of the outlet 17 and
is rotatable relative to the indoor unit main body 10. The flap 24
has the form of a flat plate and its lateral direction (sideward
direction) coincides with the longitudinal direction. The flap 24
has a length in the longitudinal direction that is substantially
the same as that of the outlet 17. The flap 24 is configured to be
pivoted by a flap driving motor 28 (refer to FIG. 3) about a
rotation axis C1.
[0046] The indoor unit 1 of the present embodiment includes a
movement mechanism 29 that is configured to move the two side walls
26S of the blow-out flow path 26. More specifically, the two side
walls 26S each include a fixed side wall 26SF and a movable side
wall 26SM. The fixed side wall SF and the movable side wall 26SM
are arranged to be overlapped with each other in the lateral
direction (sideward direction). The movable side wall 26SM is
configured to be movable so as to slide relative to the fixed side
wall SF and project out of the outlet 17. The movement mechanism 29
moves the movable side walls 26SM. The movement mechanism 29
includes a first motor (not shown), which serves a drive source,
and a rotation-linear movement conversion mechanism (not shown),
which converts rotation of the first motor into linear movement in
a predetermined direction. One example of the movement mechanism 29
is a feed-screw mechanism. Further, in a state in which the movable
side walls 26SM project out of the outlet 17, the movement
mechanism 29 is configured to move the movable side walls 26SM so
as to decrease the cross-sectional area between the left and right
movable side walls 26SM. In one example, the movement mechanism 29
includes a second motor (not shown) that pivots each movable side
wall 26SM about a rotation axis C2 (refer to FIG. 2B). This allows
the distance between the left and right movable side walls 26SM in
the sideward direction to be changed at a projected end side. In
this manner, the movement mechanism 29 allows for switching between
a restricted state, in which the cross-sectional area between the
left and right movable side walls 26SM is decreased, and a normal
state, in which the cross-sectional area between the left and right
movable side walls 26SM is not decreased. In one example, in the
restricted state, the distance between the left and right movable
side walls 26SM in the sideward direction at the projected end side
is less than the sideward length of the outlet 17.
[0047] As shown in FIG. 3, the air conditioner includes an outdoor
control unit 7 that controls each of a compressor 3 of an outdoor
unit 2, a four-way switching valve 4, an outdoor fan 5, and an
expansion valve 6. In one example, the outdoor control unit 7
controls the operational frequency (Hz) of the compressor 3, the
rotational speed (rpm) of a motor of the outdoor fan 5, and the
open degree of the expansion valve 6. Further, the outdoor control
unit 7 switches the four-way switching valve 4 between a first
state, in which a refrigerant circuit of the air conditioner (not
shown) is in a cooling cycle, and a second state, in which the
refrigerant circuit is in a heating cycle.
[0048] The indoor unit 1 includes an indoor control unit 30. The
indoor control unit 30 includes a processor and storage. The
processor executes predetermined control programs, and the storage
stores information used for various types of control programs and
control processes. The processor includes, for example, a central
processing unit (CPU) or a micro-processing unit (MPU). The storage
includes, for example, a nonvolatile memory and a volatile memory.
The non-volatile memory includes, for example, a read-only memory
(ROM), a hard disk, and a flash memory. The volatile memory
includes, for example, a random-access memory (RAM). The indoor
control unit 30 may include one or more microcomputers. The outdoor
control unit 7 may be configured in the same manner as the indoor
control unit 30.
[0049] The indoor control unit 30 is configured to establish wired
or wireless communication with the outdoor control unit 7. Further,
the indoor control unit 30 is configured to establish wireless
communication with a remote controller 31. The indoor control unit
30 controls the cross-flow fan 23, the flap driving motor 28, and
the movement mechanism 29 based on operation instructions from the
remote controller 31. Further, the indoor control unit 30 transmits
the contents of an operation instruction from the remote controller
31 to the outdoor control unit 7. Based on the operation
instruction from the remote controller 31, the outdoor control unit
7 controls the operational frequency (Hz) of the compressor 3, the
rotational speed (rpm) of the outdoor fan 5, the open degree of the
expansion valve 6, and switching of the four-way switching valve 4
between the first state and the second state.
[0050] The indoor control unit 30 of the present embodiment
controls the movement mechanism 29 to switch between the stored
state, in which the movable side walls 26SM do not project out of
the outlet 17 as shown in FIGS. 1A and 2A, and the projected state,
in which the movable side walls 26SM project out of the outlet 17
as shown in FIGS. 1B and 2B. In one example, the indoor control
unit 30 controls the movement mechanism 29 to be in the projected
state when an air conditioning operation is performed and controls
the movement mechanism 29 to be in the stored state when an air
conditioning operation is stopped. In one example, as shown in
FIGS. 1B and 2B, in the projected state, the movable side walls
26SM are configured to entirely cover transverse sides (up-down
sides) of the outlet 17 in the projected state.
[0051] Also, when an air conditioning operation is stopped, the
indoor control unit 30 controls the flap driving motor 28 so that
the flap 24 covers the outlet 17 as shown in FIGS. 1A and 2A.
Further, when an air conditioning operation is performed, the
indoor control unit 30 controls the flap driving motor 28 so that
the flap 24 opens the outlet 17 as shown in FIGS. 1B and 2B. In
this manner, when an air conditioning operation is stopped, the
indoor unit 1 shown in FIGS. 1A and 2A is in a state in which the
movable side walls 26SM and the flap 24 do not project out of the
indoor unit main body 10. Further, when an air conditioning
operation is performed, the indoor unit 1 shown in FIGS. 1B and 2B
is in a state in which the movable side walls 26SM and the flap 24
project out of the indoor unit main body 10.
[0052] When an air conditioning operation is performed, the pivotal
position of the flap 24 can be freely changed. In one example, the
pivotal position of the flap 24 is changeable by an instruction
from the remote controller 31.
[0053] Further, when surging occurs, the indoor control unit 30
controls the movement mechanism 29 in the restricted state to
decrease the cross-sectional area between the left and right
movable side walls 26SM with the second motor that pivots each
movable side wall 26SM about the rotation axis C2 (refer to FIG.
2B). In the restricted state, the cross-sectional area of the
blow-out flow path 26 at a downstream side of the outlet 17 is
smaller than the cross-sectional area of the outlet 17. This
increases the velocity of the indoor air in the blow-out flow path
26 and impedes surging. Further, when surging is impeded, the
indoor control unit 30 controls the movement mechanism 29 to switch
from the restricted state to the normal state with the second
motor. Here, surging refers to noise (for example, rustling noise)
produced when the volume or pressure of the indoor air blown out of
the outlet 17 becomes unstable and backflow forms at the outlet 17.
Surging is likely to occur, for example, when the air filter 21 is
clogged with dust and the air flow resistance is increased or when
condensation is formed on the indoor heat exchanger 22.
[0054] In one example, surging is detected from the rotational
speed (rpm) of a fan motor (not shown) of the cross-flow fan 23.
More specifically, the indoor control unit 30 sets the rotational
speed of the fan motor in accordance with the operation instruction
from the remote controller 31. The rotational speed of the fan
motor that is set will be referred to as the set rotational speed.
The indoor control unit 30 determines whether the rotational speed
of the fan motor is in a tolerable rotational speed range that has
a predetermined width centered on the set rotational speed. When
the rotational speed of the fan motor is in the tolerable
rotational speed range, the rotational speed of the fan motor is
stable and the volume and pressure of the indoor air are less
likely to be unstable. Accordingly, the indoor control unit 30
determines that surging has not occurred. When the rotational speed
of the motor is outside the tolerable rotational speed range, the
rotational speed of the fan motor is unstable and the volume and
pressure of the indoor air are likely to be unstable. Accordingly,
the indoor control unit 30 determines that surging has occurred. In
the above-described detection of surging, the predetermined width
is used to determine whether surging has occurred due to variations
in the rotational speed of the fan motor and is set in advance
through tests or the like.
[0055] Alternatively, surging may be detected from the current
supplied to the fan motor of the cross-flow fan 23. More
specifically, the indoor control unit 30 determines whether the
current supplied to the fan motor is in a tolerable current range
that has a predetermined width centered on a current value
corresponding to the set rotational speed. When the current
supplied to the fan motor is in the tolerable current range, the
volume and pressure of the indoor air are stable and the current
supplied to the fan motor is stable. Accordingly, the indoor
control unit 30 determines that surging has not occurred. When the
current supplied to the fan motor is outside the tolerable current
range, the volume and pressure of the indoor air are unstable and
the current supplied to the fan motor is unstable. Accordingly, the
indoor control unit 30 determines that surging has occurred. The
predetermined width is used to determine whether surging has
occurred due to variations in the current supplied to the fan motor
and is set in advance through tests or the like.
[0056] One example of a processing procedure for a movement control
of the movement mechanism 29 executed by the indoor control unit 30
will now be described with reference to FIG. 4. This movement
control is executed over a period of time from when an air
conditioning operation starts to when it ends.
[0057] In step S11, the indoor control unit 30 determines whether
to start an air conditioning operation. In one example, when an
operation start instruction has been received from the remote
controller 31, the indoor control unit 30 determines to start an
air conditioning operation. Further, when an operation start
instruction has not been received, the indoor control unit 30
determines not to start an air conditioning operation.
[0058] When the indoor control unit 30 determines not to start an
air conditioning operation (step S11: NO), the indoor control unit
30 ends the process. In this case, the movable side walls 26SM are
maintained to be in the stored state. When the indoor control unit
30 determines to start an air conditioning operation (step S11:
YES), the indoor control unit 30 sets the movable side walls 26SM
in the projected state in step 12. This projects the movable side
walls 26SM out of the outlet 17. Subsequently, in step S13, the
indoor control unit 30 determines whether surging has occurred.
[0059] When determining that surging has occurred (step S13: YES),
the indoor control unit 30 controls the second motor of the
movement mechanism 29 to switch to the restricted state, in which
the cross-sectional area between the left and right movable side
walls 26SM is decreased, in step S14. Then, in step S15, the indoor
control unit 30 determines whether to end the air conditioning
operation. In one example, when an operation end instruction has
been received from the remote controller 31, the indoor control
unit 30 determines to end the air conditioning operation. Further,
when an operation end instruction has not been received, the indoor
control unit 30 determines not to end the air conditioning
operation.
[0060] When the indoor control unit 30 determines not to end the
air conditioning operation (step S15: NO), the indoor control unit
30 proceeds to step S13. When the indoor control unit 30 determines
to end the air conditioning operation (step S15: YES), the indoor
control unit 30 sets the movable side walls 26SM in the stored
state in step S16. This stores the movable side walls 26SM in the
indoor unit main body 10.
[0061] Further, when surging has not occurred (step S13: NO), the
indoor control unit 30 determines whether the movable side walls
26SM are in the restricted state in step S17. When the movable side
walls 26SM are in the restricted state (step S17: YES), the indoor
control unit 30 changes the movable side walls 26SM to the normal
state in step S18 and then proceeds to step S15. When the movable
side walls 26SM are in the normal state (step S17: NO), the indoor
control unit 30 maintains the movable side walls 26SM in the normal
state and then proceeds to step S15.
[0062] The operation of the present embodiment will now be
described.
[0063] If the outer diameter D of the impeller 25 of the cross-flow
fan 23 is increased to lower power consumption and reduce noise
without increasing the height H of the indoor unit main body 10 so
as to limit decreases in the ease of installation of the indoor
unit main body 10, the region that defines the blow-out flow path
26 of the cross-flow fan 23 in the indoor unit main body 10 would
be decreased and the blow-out flow path 26 would be shortened. When
the blow-out flow path 26 is shortened, the dynamic pressure of the
indoor air will not be sufficiently converted into the static
pressure in the blow-out flow path 26. This would decrease the air
volume and pressure in the cross-flow fan 23.
[0064] Also, when the air flow resistance inside the indoor unit
main body 10 is increased due to condensation on the indoor heat
exchanger 22 or clogging of the air filter 21, the velocity of the
indoor air in the blow-out flow path 26 will be decreased and
backflow from the outlet 17 is likely to be generated. As a result,
backflow of indoor air from the outlet 17 may cause surging that
destabilizes the flow of the indoor air blown out of the cross-flow
fan 23. Particularly, it is known that the velocity of indoor air
at the two sideward ends of the outlet 17 is slower than that at a
laterally central part of the outlet 17. Accordingly, backflow from
the outlet 17 is more likely to be generated at the two sideward
ends of the outlet 17.
[0065] In this respect, in the present embodiment, the movable side
walls 26SM project out of the outlet 17 when an air conditioning
operation is performed. This allows the blow-out flow path 26 to be
extended by an amount corresponding to the length of the movable
side walls 26SM. Furthermore, the movable side walls 26SM extend
from the two sideward ends of the outlet 17 to project out of the
outlet 17. This limits backflow of indoor air into the outlet 17
from an outer side of the two sideward ends of the outlet 17.
Consequently, surging is impeded and changes in the air volume and
pressure in the cross-flow fan 23 are limited.
[0066] The present embodiment has the following advantages.
[0067] (1-1) The movable side walls 26SM of the two side walls 26S
are arranged to project out of the outlet 17 at least when an air
conditioning operation is performed. With this structure, the
movable side walls 26SM restrict the indoor air blown out of the
outlet 17 from flowing sideward from the outlet 17. This allows the
blow-out flow path 26 to be extended from the outlet 17. In this
manner, the static pressure in the blow-out flow path 26 is
increased to increase the air volume of the blow-out flow path 26.
Further, when the air flow resistance (internal pressure loss)
inside the indoor unit main body 10 is increased due to, for
example, condensation on the indoor heat exchanger 22, clogging of
the air filter 21, or the like, backflow of indoor air from the two
ends of the outlet 17 is restricted. Thus, surging is unlikely to
occur.
[0068] (1-2) When surging occurs, the movement mechanism 29
decreases the distance between the two movable side walls 26SM so
that the distance is less than the sideward length of the outlet
17. With this structure, the cross-sectional area of the blow-out
flow path 26 at a downstream side of the outlet 17 is decreased so
that the velocity of indoor air in the blow-out flow path 26 at the
downstream side of the outlet 17 is increased. This restricts
backflow of indoor air from the outlet 17 and thereby impedes
surging.
[0069] (1-3) The indoor unit 1 includes the movement mechanism 29
that switches to the projected state, in which the movable side
walls 26SM project out of the outlet 17, when an air conditioning
operation is performed and switches to the stored state, in which
the movable side walls 26SM do not project out of the outlet 17,
when an air conditioning operation is stopped. With this structure,
the movable side walls 26SM project out of the indoor unit main
body 10 when an air conditioning operation is performed. Thus,
surging is unlikely to occur. Further, the movable side walls 26SM
are stored in the indoor unit main body 10 when an air conditioning
operation is stopped. Thus, the aesthetic appearance of the indoor
unit 1 is improved.
[0070] (1-4) The indoor unit 1 is configured so that the ratio
(H/D) of the height H of the indoor unit main body 10 to the outer
diameter D of the impeller 25 of the cross-flow fan 23 is less than
2.2. With this structure, the indoor unit main body 10 uses the
cross-flow fan 23 including the impeller 25 with a relatively large
outer diameter D. This allows noise and power consumption to be
reduced when the indoor unit 1 is operating.
[0071] (1-5) The indoor unit 1 is configured so that the ratio
(H/D) of the height H of the indoor unit main body 10 to the outer
diameter D of the impeller 25 of the cross-flow fan 23 is greater
than or equal to 1.6 and less than 2.2. This structure limits
decreases in the ease of setting of the indoor unit main body 10 in
addition to obtaining advantage (1-4).
[0072] (1-6) The height H of the indoor unit main body 10 is less
than or equal to 295 mm. This limits decreases in the ease of
installation of the indoor unit main body 10. Particularly, the
height H of the indoor unit main body 10 is greater than or equal
to 250 mm and less than or equal to 295 mm. In this case, the
cross-flow fan 23 including the impeller 25 that has a relatively
large outer diameter D can be used. This allows power consumption
and noise to be reduced while limiting decrease in the ease of
setting of the indoor unit main body 10.
Second Embodiment
[0073] An indoor unit 1 of an air conditioner in accordance with a
second embodiment will now be described with reference to FIGS. 5
and 6. The indoor unit 1 of the present embodiment differs from the
indoor unit 1 of the first embodiment in that the lower wall 26L of
the blow-out flow path 26 is projected out of the outlet 17
together with the two side walls 26S when an air conditioning
operation is performed. In the description hereafter, same
reference numerals are given to those elements that are the same as
the indoor unit 1 of the first embodiment. Such elements will not
be described in detail.
[0074] As shown in FIGS. 5B and 6B, the lower wall 26L includes a
fixed lower wall 26LF and a movable lower wall 26LM. The flap 24 is
coupled to a distal end of the movable lower wall 26LM and is
pivotal relative to the movable lower wall 26LM. The fixed lower
wall 26LF and the movable lower wall 26LM are overlapped with each
other in the vertical direction (up-down direction). The movable
lower wall 26LM is configured to be movable so as to slide relative
to the fixed lower wall 26LF and project out of the outlet 17.
[0075] The movement mechanism 29 of the present embodiment is
configured to move the movable side walls 26SM and the movable
lower wall 26LM. In one example, the movement mechanism 29 is
configured to move and slide the movable side walls 26SM relative
to the fixed side walls SF and move and slide the movable lower
wall 26LM relative to the fixed lower wall 26LF. The movement
mechanism 29 includes a first motor, a first rotation-linear
movement conversion mechanism that converts rotation of the first
motor into linear movement of the movable side walls 26SM, and a
second rotation-linear movement conversion mechanism that converts
rotation of the first motor into linear movement of the movable
lower wall 26LM. In other words, the movement mechanism 29 of the
present embodiment moves the movable side walls 26SM and the
movable lower wall 26LM with a single drive source.
[0076] The indoor control unit 30 of the present embodiment (refer
to FIG. 3) controls the movement mechanism 29 to switch between a
stored state, in which the movable side walls 26SM and the movable
lower wall 26LM do not project out of the outlet 17 as shown in
FIGS. 5A and 6A, and a projected state, in which the movable side
walls 26SM and the movable lower wall 26LM project out of the
outlet 17 as shown in FIGS. 5B and 6B. In one example, the indoor
control unit 30 controls the movement mechanism 29 in the projected
state when an air conditioning operation is performed and controls
the movement mechanism 29 in the stored state when an air
conditioning operation is stopped.
[0077] In the projected state, the movable side walls 26SM are
located above the sideward ends of the movable lower wall 26LM. The
movable side walls SM are arranged so that no gap is formed between
the movable side walls 26SM and the movable lower wall 26LM in the
vertical direction. Further, each movable side wall 26SM is pivotal
about the rotation axis C2 between the upper wall 26U and the
movable lower wall 26LM.
[0078] Also, the relationship of the outer diameter D of the
impeller 25 of the cross-flow fan 23 and the height H of the indoor
unit main body 10 of the present embodiment is the same as the
relationship of the outer diameter D of the impeller 25 of the
cross-flow fan 23 and the height H of the indoor unit main body 10
of the first embodiment.
[0079] The present embodiment has the following advantages in
addition to the advantages of the first embodiment.
[0080] (2-1) The movable side walls 26SM of the two side walls 26S
and the movable lower wall 26LM of the lower wall 26L are arranged
to project out of the outlet 17 at least when an air conditioning
operation is performed. With this structure, the movable side walls
26SM and the movable lower walls 26LM restrict the indoor air blown
out of the outlet 17 from flowing sideward and downward from the
outlet 17. This allows the blow-out flow path 26 to be extended
from the outlet 17. In this manner, the blow-out flow path 26
serving as a diffuser is lengthened compared to a structure that
does not project the two side walls 26S and the lower wall 26L out
of the outlet 17. This further increases the static pressure in the
blow-out flow path 26 and further increases the air volume of the
blow-out flow path 26. Also, when the air flow resistance (internal
pressure loss) in the indoor unit main body 10 is high, backflow of
indoor air from the two sideward ends and the lower part of the
outlet 17 is restricted. Thus, surging is even less likely to
occur.
[0081] (2-2) The indoor unit 1 includes the movement mechanism 29
that projects the movable side walls 26SM and the movable lower
wall 26LM out of the outlet 17 in the projected state when an air
conditioning operation is performed and does not project the
movable side walls 26SM and the movable lower wall 26LM out of the
outlet 17 in the stored state when an air conditioning operation is
stopped. With this structure, the movable side walls 26SM and the
movable lower wall 26LM project out of the indoor unit main body 10
when an air conditioning operation is performed. Thus, surging is
unlikely to occur. Further, the movable side walls 26SM and the
movable lower wall 26LM are stored in the indoor unit main body 10.
Thus, the aesthetic appearance of the indoor unit 1 is
improved.
Third Embodiment
[0082] An indoor unit 1 of an air conditioner in accordance with a
third embodiment will now be described with reference to FIGS. 7
and 8. The indoor unit 1 of the present embodiment differs from the
indoor unit 1 of the second embodiment in that the upper wall 26U
projects out of the outlet 17 together with the two side walls 26S
and the lower wall 26L of the blow-out flow path 26 when an air
conditioning operation is performed. In the description hereafter,
same reference numerals are given to those elements that are the
same as the indoor unit 1 of the second embodiment. Such elements
will not be described in detail.
[0083] The upper wall 26U of the present embodiment includes a
fixed upper wall 26UF and a movable upper wall 26UM. The fixed
upper wall 26UF and the movable upper wall 26UM are overlapped with
each other in the vertical direction (up-down direction). The
movable upper wall 26UM is configured to be movable so as to slide
relative to the fixed upper wall 26UF and project out of the outlet
17.
[0084] The movement mechanism 29 of the present embodiment is
configured to move the movable side walls 26SM, the movable lower
wall 26LM, and the movable upper wall 26UM. In one example, the
movement mechanism 29 is configured to move and slide the movable
side walls 26SM relative to the fixed side walls SF, move and slide
the movable lower wall 26LM relative to the fixed lower wall 26LF,
and move and slide the movable upper wall 26UM relative to the
fixed upper wall 26UF. The movement mechanism 29 includes a first
motor, a first rotation-linear movement conversion mechanism that
converts rotation of the first motor into linear movement of the
movable side walls 26SM, a second rotation-linear movement
conversion mechanism that converts rotation of the first motor into
linear movement of the movable lower wall 26LM, and a third
rotation-linear movement conversion mechanism that converts
rotation of the first motor into linear movement of the movable
upper wall 26UM. In other words, the movement mechanism 29 of the
present embodiment moves the movable side walls 26SM, the movable
lower wall 26LM, and the movable upper wall 26UM with a single
drive source.
[0085] The indoor control unit 30 of the present embodiment (refer
to FIG. 3) controls the movement mechanism 29 and switches between
a stored state, in which the movable side walls 26SM, the movable
lower wall 26LM, and the movable upper wall 26UM do not project out
of the outlet 17 as shown in FIGS. 7A and 7A, and a projected
state, in which the movable side walls 26SM, the movable lower wall
26LM, and the movable upper wall 26UM project out of the outlet 17
as shown in FIGS. 7Ba and 7B. In one example, the indoor control
unit 30 controls the movement mechanism 29 to be in the projected
state when an air conditioning operation is performed and controls
the movement mechanism 29 to be in the stored state when an air
conditioning operation is stopped.
[0086] In the present embodiment, as shown in FIGS. 7B and 8B, the
movable side walls 26SM are configured to entirely cover vertical
sides (up-down sides) of the movable lower wall 26LM and the
movable upper wall 26UM in the projected state. Specifically, in
the projected state, the movable side walls 26SM are located
between the movable lower wall 26LM and the movable upper wall 26UM
in the vertical direction and at sideward ends of the movable lower
wall 26LM and the movable upper wall 26UM. The movable side walls
SM are arranged so that no gap is formed between the movable side
walls 26SM and the movable lower wall 26LM in the vertical
direction. Further, each movable side wall 26SM is pivotal about
the rotation axis C2 between the movable upper wall 26UM and the
movable lower wall 26LM.
[0087] Also, the relationship of the outer diameter D of the
impeller 25 of the cross-flow fan 23 and the height H of the indoor
unit main body 10 of the present embodiment is the same as the
relationship of the outer diameter D of the impeller 25 of the
cross-flow fan 23 and the height H of the indoor unit main body 10
of the first embodiment.
[0088] The present embodiment has the following advantages in
addition to the advantages of the first and second embodiments.
[0089] (3-1) The movable side walls 26SM of the two side walls 26S,
the movable lower wall 26LM of the lower wall 26L, and the movable
upper wall 26UM of the upper wall 26U are arranged to project out
of the outlet 17 at least when an air conditioning operation is
performed. This allows the blow-out flow path 26, which is
surrounded by wall portions at the sideward sides and the vertical
sides, to be extended from the outlet 17. In this manner, the
blow-out flow path 26 serving as a diffuser is lengthened compared
to a structure that does not project the two side walls 26S, the
lower wall 26L, and the upper wall 26U out of the outlet 17. This
further increases the static pressure in the blow-out flow path 26
and further increases the air volume of the blow-out flow path 26.
Also, when the air flow resistance (internal pressure loss) in the
indoor unit main body 10 is high, backflow of indoor air from the
two sideward ends, the upper end, and the lower end of the outlet
17 is restricted. Thus, surging is even less likely to occur.
[0090] (3-2) The indoor unit 1 includes the movement mechanism 29
that projects the movable side walls 26SM, the movable lower wall
26LM, and the movable upper wall 26UM project out of the outlet 17
in the projected state when an air conditioning operation is
performed and does not project the movable side walls 26SM, the
movable lower wall 26LM, and the movable upper wall 26UM out of the
outlet 17 in the stored state when an air conditioning operation is
stopped. With this structure, the movable side walls 26SM, the
movable lower wall 26LM, and the movable upper wall 26UM project
out of the indoor unit main body 10 when an air conditioning
operation is performed. Thus, surging is unlikely to occur.
Further, the movable side walls 26SM, the movable lower wall 26LM,
and the movable upper wall 26UM are stored in the indoor unit main
body 10 when an air conditioning operation is stopped. This
improves the aesthetic appearance of the indoor unit 1.
Fourth Embodiment
[0091] An indoor unit 1 of an air conditioner in accordance with a
fourth embodiment will now be described with reference to FIG. 9.
The indoor unit 1 of the present embodiment differs from the indoor
unit 1 of the first embodiment in the structure of the cross-flow
fan 23. In the description hereafter, same reference numerals are
given to those elements that are the same as the indoor unit 1 of
the first embodiment. Such elements will not be described in
detail.
[0092] As shown in FIGS. 9A and 9B, in the indoor unit 1, the
cross-flow fan 23 includes a support 32 that pivotally supports the
flap 24 about the rotation axis C1. The support 32 is coupled to
the lower end of the indoor unit main body 10 in the vicinity of
the outlet 17. In other words, the support 32 forms the lower end
of the indoor unit main body 10. The support 32 has a portion
located closer to the outlet 17 to form part of the blow-out flow
path 26 (lower wall 26L). The support 32 is faced toward a tongue
26A of the upper wall 26U in a direction traversing the blow-out
flow path 26.
[0093] As shown in FIG. 9B, the distance between an intersection
point A, which is where a tangent VL inscribing the tongue 26A of
the upper wall 26U orthogonally intersects a flow path formation
surface 32X of the support 32 opposing the tongue 26A, and point B,
which is the lower end of the indoor unit main body 10, is referred
to as distance L. Further, the outer diameter of the impeller 25 of
the cross-flow fan 23 is referred to as the outer diameter D. In
the present embodiment, a ratio (L/D) of the distance L to the
outer diameter D is set to less than 0.05. Point B is located at
the downstream-most portion of the lower wall 26L of the blow-out
flow path 26. In the present embodiment, as shown in FIG. 9B, point
B is the lowermost point of the flow path formation surface 32X of
the support 32.
[0094] In the present embodiment, the movable side walls 26SM are
omitted from the two side walls 26S. Further, in the present
embodiment, the movement mechanism 29 includes the flap driving
motor 28 (refer to FIG. 3). The movement mechanism 29 is configured
to allow for switching between a stored state, in which the flap 24
forming the blow-out flow path 26 covers the outlet 17, and a
projected state, in which the flap 24 projects out of the outlet
17. In the same manner as the first embodiment, the movement
mechanism 29 is in the projected state when an air conditioning
operation is performed and in the stored state when an air
conditioning operation is stopped. In other words, as shown by the
broken lines in FIG. 9A, the flap 24 is pivoted relative to the
support 32 to cover the outlet 17 when an air conditioning
operation is stopped. Further, as shown by the solid lines in FIG.
9A, the flap 24 is pivoted relative to the support 32 to open the
outlet 17 when an air conditioning operation is performed. In the
projected state, the flap 24 is faced toward a flow path formation
surface 26X of the upper wall 26U.
[0095] The present embodiment has the following advantages.
[0096] (4-1) The flap 24 forming the lower wall of the blow-out
flow path 26 is configured to project out of the outlet 17 at least
when an air conditioning operation is performed. Further, the ratio
(L/D) of the distance L from the tangent VL, which inscribes the
tongue 26A of the cross-flow fan 23, to the point B, which is
located at the lower end of the indoor unit main body 10, to the
outer diameter D of the impeller 25 of the cross-flow fan 23 is
less than 0.05. This limits decreases in the ease of installation
of the indoor unit main body 10 and allows power consumption and
noise to be reduced by increasing and the outer diameter D of the
impeller 25 of the cross-flow fan 23. Also, the flap 24 projects
out of the outlet 17 so that the blow-out flow path 26, or the
diffuser, has a sufficient length. This maintains the functionality
of the diffuser. Consequently, adverse effects on the performance
of the indoor unit 1 will be limited.
[0097] (4-2) The indoor unit 1 includes the movement mechanism 29
that projects the flap 24 out of the outlet 17 in the projected
state when an air conditioning operation is performed and does not
project the flap 24 out of the outlet 17 in the stored state when
an air conditioning operation is stopped. This projects the flap 24
out of the indoor unit main body 10 when an air conditioning
operation is performed. Thus, surging is unlikely to occur.
Further, the flap 24 is stored in the indoor unit main body 10 when
an air conditioning operation is stopped. Thus, the aesthetic
appearance of the indoor unit 1 is improved.
Modified Examples
[0098] The description related with the above embodiments
exemplifies, without any intention to limit, applicable forms of an
indoor unit of an air conditioner according to the present
disclosure. In addition to the embodiments described above, the
indoor unit of an air conditioner in accordance with the present
disclosure is applicable to, for example, modified examples of the
above embodiments that are described below and combinations of at
least two of the modified examples that do not contradict each
other. In the modified examples described hereafter, same reference
numerals are given to those components that are the same as the
corresponding components of the above embodiments. Such components
will not be described in detail.
[0099] In the first to third embodiments, at least one of the two
side walls 26S, the lower wall 26L, and the upper wall 26U of the
blow-out flow path 26 may include a movable wall and a fixed wall.
More specifically, the indoor unit 1 may be configured in any one
of following manners (A1) to (A4).
[0100] (A1) The indoor unit 1 is configured so that each side wall
26S of the blow-out flow path 26 includes the movable side wall
26SM, the upper wall 26U includes the movable upper wall 26UM, and
the lower wall 26L does not include the movable lower wall 26LM.
With this structure, the movable side walls 26SM and the movable
upper wall 26UM project out of the outlet 17. Thus, the movable
side walls 26SM and the movable upper wall 26UM restrict the indoor
air blown out of the outlet 17 from flowing sideward and upward
from the outlet 17. This allows the blow-out flow path 26 to be
extended from the outlet 17. In this manner, the blow-out flow path
26 serving as a diffuser is lengthened compared to a structure that
does not project the two side walls 26S and the upper wall 26U out
of the outlet 17. This increases the static pressure in the
blow-out flow path 26 and increases the air volume of the blow-out
flow path 26. Further, when the air flow resistance (internal
pressure loss) in the indoor unit main body 10 is high, backflow of
air from the two sideward ends and the upper part of the outlet 17
is restricted. Thus, surging is even less likely to occur.
[0101] (A2) The indoor unit 1 is configured so that the lower wall
26L of the blow-out flow path 26 includes the movable lower wall
26LM, the upper wall 26U includes the movable upper wall 26UM, and
the two side walls 26S do not include the movable side walls 26SM.
With this structure, the movable lower wall 26LM projects out of
the outlet 17. Thus, the movable lower wall 26LM restricts the
indoor air blown out of the outlet 17 from flowing downward from
the outlet 17. This allows the blow-out flow path 26 to be extended
from the outlet 17. In this manner, the blow-out flow path 26
serving as a diffuser is lengthened compared to a structure that
does not project the lower wall 26L out of the outlet 17. This
increases the static pressure in the blow-out flow path 26 and
increases the air volume of the blow-out flow path 26. Further,
when the air flow resistance (internal pressure loss) in the indoor
unit main body 10 is high, backflow of air from the lower part of
the outlet 17 is restricted. Thus, surging is even less likely to
occur.
[0102] (A3) The indoor unit 1 is configured so that the lower wall
26L of the blow-out flow path 26 includes the movable lower wall
26LM, the two side walls 26S do not include the movable side walls
26SM, and the upper wall 26U does not include the movable upper
wall 26UM. With this structure, the movable lower wall 26LM
projects out of the outlet 17. Thus, the movable lower wall 26LM
restricts the indoor air blown out of the outlet 17 from flowing
downward from the outlet 17. This allows the blow-out flow path 26
to be extended from the outlet 17. In this manner, the blow-out
flow path 26 serving as a diffuser is lengthened compared to a
structure that does not project the lower wall 26L out of the
outlet 17. This increases the static pressure in the blow-out flow
path 26 and increases the air volume of the blow-out flow path 26.
Further, when the air flow resistance (internal pressure loss) in
the indoor unit main body 10 is high, backflow of air from the
lower part of the outlet 17 is restricted. Thus, surging is even
less likely to occur.
[0103] (A4) The indoor unit 1 is configured so that the upper wall
26U of the blow-out flow path 26 includes the movable upper wall
26UM, the two side walls 26S do not include the movable side walls
26SM, and the lower wall 26L does not include the movable lower
wall 26LM. With this structure, the movable upper wall 26UM
projects out of the outlet 17. Thus, movable upper wall 26UM
restricts the indoor air blown out of the outlet 17 from flowing
upward from the outlet 17. This allows the blow-out flow path 26 to
be extended from the outlet 17. In this manner, the blow-out flow
path 26 serving as a diffuser is lengthened compared to a structure
that does not project the upper wall 26U out of the outlet 17. This
increases the static pressure in the blow-out flow path 26 and
increases the air volume of the blow-out flow path 26. Further,
when the air flow resistance (internal pressure loss) in the indoor
unit main body 10 is high, backflow of air from the upper part of
the outlet 17 is restricted. Thus, surging is even less likely to
occur.
[0104] In the above-described first to third embodiments, the two
side walls 26S may be changed to have following configurations in
(B1) to (B3).
[0105] (B1) As shown in FIGS. 10A and 10B, the two side walls 26S
each include the movable side wall 26SM that is sectoral and
extends about rotation axis C3. The movement mechanism 29 includes
a driving motor that rotates the movable side walls 26SM about the
rotation axis C3. An output shaft of the driving motor may be
directly connected to the movable side walls 26SM. Alternatively,
the output shaft of the driving motor may be connected to the
movable side walls 26SM by a decelerator. The movement mechanism 29
moves and switches the movable side walls 26SM between a stored
state shown in FIG. 10A and a projected state shown in FIG. 10B. As
shown in FIG. 10A, in the stored state, the movable side walls 26SM
are stored in the indoor unit main body 10, that is, the movable
side walls 26SM do not project out of the outlet 17. As shown in
FIG. 10B, in the projected state, the movable side walls 26SM are
in a state projected out of the indoor unit main body 10, that is,
the movable side walls 26SM project out of the outlet 17. The
movable side walls 26SM shown in FIGS. 10A and 10B are arranged
next to lateral (sideward) end surfaces of the flap 24. Preferably,
no gap is formed between the movable side walls 26SM and the
sideward end surfaces of the flap 24.
[0106] (B2) As shown in FIGS. 11A and 11B, the two side walls 26S
each include the movable side wall 26SM that is rotated about a
rotation axis C4. The movement mechanism 29 includes a driving
motor that rotates the movable side walls 26SM about the rotation
axis C4. The output shaft of the driving motor may be directly
connected to the movable side walls 26SM. Alternatively, the output
shaft of the driving motor may be connected to the movable side
walls 26SM by a decelerator. The movement mechanism 29 moves and
switches the movable side walls 26SM between a stored state shown
in FIG. 11A and a projected state shown in FIG. 11B. As shown in
FIG. 11A, in the stored state, the movable side walls 26SM cover
the lateral (sideward) ends of the outlet 17, that is, the movable
side walls 26SM do not project out of the outlet 17. In the stored
state, the flap 24 is moved by the flap driving motor 28 (refer to
FIG. 3) to cover the outlet 17. In the stored state, the movable
side walls 26SM are rotated to cover the lateral (sideward) ends of
the flap 24. As shown in FIG. 11B, in the projected state, the
movable side walls 26SM are in a state projected out of the indoor
unit main body 10, that is the movable side walls 26SM project out
of the outlet 17. In one example, when the stored state is changed
to the projected state, the movable side walls 26SM are pivoted and
moved to an outer side of the flap 24 in the lateral direction
(sideward direction). Then, the flap 24 is pivoted to project out
of the outlet 17.
[0107] (B3) As shown in FIGS. 12A and 12B, the two side walls 26S
each include the movable side wall 26SM that is expandable. The
movable side wall 26SM has an accordion structure. The movement
mechanism 29 includes a motor that serves as a drive source and a
rotation-linear movement conversion mechanism that converts
rotation of the motor into linear movement of the movable side
walls 26SM in an expanding direction. The movement mechanism 29
moves and switches the movable side walls 26SM between a stored
state shown in FIG. 12A and a projected state shown in FIG. 12B. As
shown in FIG. 12A, in the stored state, the movable side walls 26SM
are retracted to be stored in the indoor unit main body 10, that
is, the movable side walls 26SM do not project out of the outlet
17. As shown in FIG. 12B, in the projected state, the movable side
walls SM are expanded to project out of the indoor unit main body
10, that is, the movable side walls SM are in a state projected out
of the outlet 17. The movable side walls 26SM in FIGS. 12A and 12B
are arranged adjacent to the flap 24 in the lateral direction
(sideward direction). Preferably, no gap is formed between the
movable side walls 26SM and the sideward end surfaces of the flap
24.
[0108] In the first to third embodiments, the movable side walls
26SM do not have to be configured to be rotated about the rotation
axis C2. In this case, the movable side walls 26SM may be
configured so that the distance between the movable side walls 26SM
in the sideward direction decreases toward the downstream side in
the blow-out flow path 26.
[0109] In the second and third embodiments, as shown in FIGS. 13A
and 13B, the movable lower wall 26LM of the lower wall 26L arranged
at the distal end of the fixed lower wall 26LF, which is the lower
end of the indoor unit main body 10, may be pivotal about a
rotation axis C5. The flap 24 is pivotally arranged at the distal
end of the movable lower wall 26LM. As shown in FIG. 13A, when an
air conditioning operation is stopped, the movement mechanism 29
pivots the movable lower wall 26LM to cover the outlet 17 in the
stored state. In this case, the outlet 17 is covered by the movable
lower wall 26LM and the flap 24. As shown in FIG. 13B, when an air
conditioning operation is performed, the movement mechanism 29
pivots and projects the movable lower wall 26LM out of the outlet
17 in the projected state. In this case, the outlet 17 is not
covered by the movable lower wall 26LM or the flap 24. In the
projected state, the flap driving motor 28 (refer to FIG. 3) may
freely change a pivotal position of the flap 24 relative to the
movable lower wall 26LM.
[0110] In the third embodiment, as shown in FIGS. 14A and 14B, the
movable upper wall 26UM of the upper wall 26U arranged at the
distal end of the fixed upper wall 26UF may be rotatable about a
rotation axis C6. As shown in FIG. 14A, when an air conditioning
operation is stopped, the movement mechanism 29 pivots the movable
upper wall 26UM to cover the outlet 17 in the stored state. When an
air conditioning operation is stopped, the flap driving motor 28
(refer to FIG. 3) moves the flap 24 so that the flap 24 also covers
the outlet 17. In this manner, the movable upper wall 26UM and the
flap 24 entirely cover the outlet 17. As shown in FIG. 14B, when an
air conditioning operation is performed, the movement mechanism 29
pivots and projects the movable upper wall 26UM out of the outlet
17 in the projected state. In this case, the outlet 17 is not
covered by the movable upper wall 26UM or the flap 24.
[0111] In the second embodiment, the movement mechanism 29 may
include a first movement mechanism that moves the movable side
walls 26SM and a second movement mechanism that moves the movable
lower wall 26LM. The first movement mechanism and the second
movement mechanism each include a motor and a rotation-linear
movement conversion mechanism that converts rotation of the
corresponding motor into linear movement. This allows the movable
side walls 26SM to be controlled separately from the movable lower
wall 26LM.
[0112] In the second and third embodiments, when surging occurs,
the movement mechanism 29 may rotate the flap 24 to decrease the
cross-sectional area of the blow-out flow path 26 at a downstream
side of the outlet 17.
[0113] In the third embodiment, the movement mechanism 29 may
include a first movement mechanism that moves the movable side
walls 26SM, a second movement mechanism that moves the movable
lower wall 26LM, and a third movement mechanism that moves the
movable upper wall 26UM. The first to third movement mechanisms
each include a motor and a rotation-linear movement conversion
mechanism that converts rotation of the corresponding motor into
linear movement. This allows for separate control of the movable
side walls 26SM, the movable lower wall 26LM, and the movable upper
wall 26UM.
[0114] In the third embodiment, the movement mechanism 29 may
include a first movement mechanism that moves the movable side
walls 26SM and the movable lower wall 26LM and a second movement
mechanism that moves the movable upper wall 26UM. The first and
second movement mechanisms each include a motor and a
rotation-linear movement conversion mechanism that converts
rotation of the corresponding motor into linear movement. This
allows the movable side walls 26SM and the movable lower wall 26LM
to be controlled separately from the movable upper wall 26UM.
[0115] In third embodiment, the movement mechanism 29 may include a
first movement mechanism that moves the movable side walls 26SM and
a second movement mechanism that moves the movable lower wall 26LM
and the movable upper wall 26UM. The first and second movement
mechanisms each include a motor and a rotation-linear movement
conversion mechanism that converts rotation of the corresponding
motor into linear movement. This allows the movable side walls 26SM
to be controlled separately from the movable lower wall 26LM and
the movable upper wall 26UM.
[0116] In the third embodiment, the movement mechanism 29 may
include a first movement mechanism that moves the movable side
walls 26SM and the movable upper wall 26UM and a second movement
mechanism that moves the movable lower wall 26LM. The first and
second movement mechanisms each include a motor and a
rotation-linear movement conversion mechanism that converts
rotation of the corresponding motor into linear movement. This
allows the movable side walls 26SM and the movable upper wall 26UM
to be controlled separately from the movable lower wall 26LM.
[0117] In the third embodiment, the blow-out flow path 26 may be
formed to project out of the outlet 17 so that the cross-sectional
area of the blow-out flow path 26 at a downstream side of the
outlet 17 is smaller than the cross-sectional area of the outlet
17. In one example, at least one of the movable side walls 26SM,
the movable lower wall 26LM, and the movable upper wall 26UM is
moved by the movement mechanism 29 so that the cross-sectional area
surrounded by the movable side walls 26SM, the movable lower wall
26LM, and the movable upper wall 26UM, which are elements of the
blow-out flow path 26, is smaller than the cross-sectional area of
the outlet 17. This increases the velocity in the blow-out flow
path 26 at a downstream side and restricts backflow of indoor air
from the outlet 17. Thus, surging is even less likely to occur.
[0118] In the fourth embodiment, the indoor unit 1 may be changed
in any one of following manners (C1) to (C4).
[0119] (C1) The indoor unit 1 further includes the movable side
walls 26SM and the movement mechanism 29 that moves the movable
side walls 26SM. In one example, the movable side walls 26SM and
the movement mechanism 29 have the same structure as the movable
side walls 26SM and the movement mechanism 29 of the first
embodiment. With this structure, the movable side walls 26SM
project out of the outlet 17. Thus, the movable side walls 26SM and
the movable upper wall 26UM restrict the indoor air blown out of
the outlet 17 from flowing sideward from the outlet 17. This allows
the blow-out flow path 26 to be extended from the outlet 17. In
this manner, the blow-out flow path 26 is lengthened compared to a
structure that does not project the two side walls 26S and the
upper wall 26U out of the outlet 17. This increases the static
pressure in the blow-out flow path 26 and increases the air volume
of the blow-out flow path 26. Further, when the air flow resistance
(internal pressure loss) in the indoor unit main body 10 is high,
backflow of air from the two sideward ends of the outlet 17 is
restricted. Thus, surging is even less likely to occur.
[0120] (C2) The indoor unit 1 further includes the movable lower
wall 26LM and the movement mechanism 29 that moves the movable
lower wall 26LM. In one example, the movable lower wall 26LM and
the movement mechanism 29 have the same structure as the movable
lower wall 26LM and the movement mechanism 29 of the second
embodiment. In this case, the flap 24 is rotatably arranged at the
distal end of the movable lower wall 26LM. With this structure, the
movable lower wall 26LM projects out of the outlet 17. Thus, the
movable lower wall 26LM restricts the indoor air blown out of the
outlet 17 from flowing downward from the outlet 17. This allows the
blow-out flow path 26 to be extended from the outlet 17. In this
manner, the blow-out flow path 26 serving as a diffuser is
lengthened compared to a structure that does not project the lower
wall 26L out of the outlet 17. This increases the static pressure
in the blow-out flow path 26 and increases the air volume of the
blow-out flow path 26. Further, when the air flow resistance
(internal pressure loss) in the indoor unit main body 10 is high,
backflow of air from the lower part of the outlet 17 is restricted.
Thus, surging is even less likely to occur.
[0121] (C3) The indoor unit 1 further includes the movable upper
wall 26UM and the movement mechanism 29 that moves the movable
upper wall 26UM. In one example, the movable upper wall 26UM and
the movement mechanism 29 have the same structure as the movable
upper wall 26UM and the movement mechanism 29 of the third
embodiment. With this structure, the movable upper wall 26UM
projects out of the outlet 17 and thus the movable upper wall 26UM
restricts the indoor air blown out of the outlet 17 from flowing
upward from the outlet 17. This allows the blow-out flow path 26 to
be extended from the outlet 17. In this manner, the blow-out flow
path 26, which functions as a diffuser, is lengthened compared to a
structure that does not project the upper wall 26U out of the
outlet 17. This increases the static pressure in the blow-out flow
path 26 and increases the air volume of the blow-out flow path 26.
Further, when the air flow resistance (internal pressure loss) in
the indoor unit main body 10 is high, backflow of air from the
upper part of the outlet 17 is restricted. Thus, surging is even
less likely to occur.
[0122] (C4) The indoor unit 1 further includes at least one of the
movable side walls 26SM, the movable lower wall 26LM, and the
movable upper wall 26UM and the movement mechanism 29 that moves at
least one of the movable side walls 26SM, the movable lower wall
26LM, and the movable upper wall 26UM. This structure has an
advantage of at least one of the above-described modified examples
(C1) to (C3).
[0123] In the first to fourth embodiments, the movement mechanism
29 may be omitted. In this case, the elements of the blow-out flow
path 26 are constantly in the projected state. In other words, at
least one of the two side walls 26S, the upper wall 26U, and the
lower wall 26L is arranged to project out of the outlet 17. In one
example, in the indoor unit 1 shown in FIGS. 15A and 15B, the two
side walls 26S, the upper wall 26U, and the lower wall 26L, which
are the elements of the blow-out flow path 26, are arranged to
project out of the outlet 17. In this case, for example, a
projection 26P may be arranged on each side wall 26S at a
downstream side of the outlet 17 so that the distance between the
two side walls 26S in the sideward direction at a downstream side
of the outlet 17 in the blow-out flow path 26 is less than the
sideward length of the outlet 17. In one example, as shown in FIGS.
15A and 15B, each projection 26P has the form of a substantially
three-sided pyramid such that the distance between the two side
walls 26S (distance between projections 26P in sideward direction)
decreases from the upper wall 26U toward the lower wall 26L.
Further, the projections 26P include surfaces 26PA opposed toward
each other in the sideward direction. The surfaces 26PA are formed
so that the distance between the projections 26P in the sideward
direction decreases toward a downstream side in the blow-out flow
path 26. The projection 26P may have any shape as long as the
distance between the two side walls 26S in the blow-out flow path
26 at a downstream side of the outlet 17 is less than the sideward
length of the outlet 17.
[0124] In the first to third embodiments, the projections 26P may
be arranged so that the distance between the two side walls 26S in
the sideward direction at a downstream side in the blow-out flow
path 26, which is extended by the two side walls 26S projected out
of the outlet 17, is constantly smaller than the distance between
the two side walls 26S in the sideward direction in the blow-out
flow path 26 at the side of the outlet 17 (upstream side). Thus,
the velocity in the blow-out flow path 26 at a downstream side is
increased. This restricts backflow of indoor air from the outlet 17
and thus surging is even less likely to occur.
[0125] It should be understood that the above-described disclosure
of the indoor unit of an air conditioner may be embodied in many
other specific forms within the scope and equivalence of the
present disclosure described in the appended claims.
* * * * *