U.S. patent application number 16/479284 was filed with the patent office on 2019-12-19 for indoor unit.
This patent application is currently assigned to Daikin Industries, Ltd.. The applicant listed for this patent is DAIKIN INDUSTRIES, LTD.. Invention is credited to Yoshiteru NOUCHI, Masashi SAITOU, Kousuke SHIOHAMA, Tarou YASUMATSU.
Application Number | 20190383522 16/479284 |
Document ID | / |
Family ID | 62908481 |
Filed Date | 2019-12-19 |
United States Patent
Application |
20190383522 |
Kind Code |
A1 |
SHIOHAMA; Kousuke ; et
al. |
December 19, 2019 |
INDOOR UNIT
Abstract
An indoor unit, being configured to constitute a refrigeration
apparatus including a refrigerant circuit, includes: a heat
exchanger; and a plurality of refrigerant pipes. R32 refrigerant is
enclosed in the refrigerant circuit. At least one of the plurality
of refrigerant pipes that circulates the R32 refrigerant has an
outer diameter of (Do-1)/8 inches while another of the plurality of
refrigerant pipes that circulates R410A refrigerant has an outer
diameter of Do/8.
Inventors: |
SHIOHAMA; Kousuke; (Osaka,
JP) ; NOUCHI; Yoshiteru; (Osaka, JP) ;
YASUMATSU; Tarou; (Osaka, JP) ; SAITOU; Masashi;
(Osaka, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
DAIKIN INDUSTRIES, LTD. |
Osaka-shi, Osaka |
|
JP |
|
|
Assignee: |
Daikin Industries, Ltd.
Osaka-shi, Osaka
JP
|
Family ID: |
62908481 |
Appl. No.: |
16/479284 |
Filed: |
December 22, 2017 |
PCT Filed: |
December 22, 2017 |
PCT NO: |
PCT/JP2017/046194 |
371 Date: |
July 19, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F25B 41/00 20130101;
F24F 1/0059 20130101; F25B 41/06 20130101; F25B 1/00 20130101; F24F
1/00 20130101; F25B 41/04 20130101; F25B 2600/25 20130101 |
International
Class: |
F25B 1/00 20060101
F25B001/00; F24F 1/0059 20060101 F24F001/0059; F25B 41/04 20060101
F25B041/04; F25B 41/06 20060101 F25B041/06 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 20, 2017 |
JP |
2017-008436 |
Claims
1. An indoor unit being configured to constitute a refrigeration
apparatus including a refrigerant circuit, the indoor unit
comprising: a heat exchanger; and a plurality of refrigerant pipes,
R32 refrigerant is enclosed in the refrigerant circuit, and at
least one of the plurality of refrigerant pipes that circulates the
R32 refrigerant has an outer diameter of (Do-1)/8 inches while
another of the plurality of refrigerant pipes that circulates R410A
refrigerant has an outer diameter of Do/8.
2. An indoor unit being configured to constitute a refrigeration
apparatus including a refrigerant circuit, the indoor unit
comprising: a heat exchanger; and a plurality of refrigerant pipes,
wherein R32 refrigerant is enclosed in the refrigerant circuit, at
least one of the plurality of refrigerant pipes has an outer
diameter of 2/8 inches or less, and the refrigeration apparatus has
a rated capacity of 7.1 kW or more.
3. The indoor unit according to claim 1, wherein the plurality of
refrigerant pipes includes: a liquid refrigerant pipe; and a gas
refrigerant pipe, and refrigerant pipe circulates the R410A
refrigerant and has an outer diameter of Do/8 inches.
4. The indoor unit according to claim 3, wherein the heat exchanger
includes a refrigerant flow divider, and the liquid refrigerant
pipe is connected to the refrigerant flow divider.
5. The indoor unit according to claim 1, wherein the rated capacity
of the refrigeration apparatus is greater than or equal to 7.1 kW
and less than or equal to 16.0 kW.
6. A refrigeration apparatus including a refrigerant circuit that
implements a refrigeration cycle by flow of refrigerant, the
refrigeration apparatus comprising: the indoor unit according to
claim 1; an outdoor unit; and a connection pipe that connects the
indoor unit and the outdoor unit.
7. A refrigeration apparatus including a refrigerant circuit that
implements a refrigeration cycle by flow of refrigerant, the
refrigeration apparatus comprising: the indoor unit according to
claim 2; an outdoor unit; and a connection pipe that connects the
indoor unit and the outdoor unit.
Description
TECHNICAL FIELD
[0001] The present invention relates to an indoor unit.
BACKGROUND
[0002] A refrigerant circuit included in a refrigeration apparatus
such as an air conditioner is configured by an indoor unit and an
outdoor unit connected to each other. Many of the refrigerant
circuits of refrigeration apparatuses currently available in the
market use R410A refrigerant. Meanwhile, from the viewpoint of
suppressing global warming, R32 refrigerant having a smaller global
warming potential (GWP) than that of R410A refrigerant has also
been used in refrigeration apparatuses recently.
[0003] Patent Literature 1 (JP 5536817 B2) discloses an air
conditioner using R32 refrigerant. In this air conditioner, an
outer diameter of a connection pipe that connects an indoor unit
and an outdoor unit is set to be smaller than that in a case where
R410A refrigerant is enclosed in a refrigerant circuit. The purpose
of this configuration is to reduce the amount of refrigerant
enclosed in the refrigerant circuit or to reduce the amount of
piping materials used.
PATENT LITERATURE
[0004] [Patent Literature 1] JP 5536817 B2
[0005] In recent years, however, refrigeration apparatuses such as
air conditioners have been required not only to reduce the amount
of enclosed refrigerant and the amount of materials used, but also
to be installed in a smaller space through downsizing of the
apparatuses. Indoor units are also required to have a similar
configuration.
[0006] An indoor unit usually includes parts such as a heat
exchanger and, if necessary, an expansion valve. The indoor unit
also includes a refrigerant pipe connected to these parts. As long
as the refrigerant pipe has substantially the same outer diameter
as the conventional pipe, the downsizing of the indoor unit is
limited.
SUMMARY
[0007] Embodiments of the present invention downsize an indoor unit
including a refrigerant pipe.
[0008] An indoor unit according to one or more embodiments of the
present invention includes a heat exchanger and a plurality of
refrigerant pipes. The indoor unit can constitute a refrigeration
apparatus including a refrigerant circuit. R32 refrigerant is
enclosed in the refrigerant circuit. At least one of the plurality
of refrigerant pipes has an outer diameter of (Do-1)/8 inches.
Here, "Do/8 inches" represents an outer diameter of one of the
refrigerant pipes in a case where R410A refrigerant is enclosed in
the refrigerant circuit.
[0009] With this configuration, the R32 refrigerant is used, and
the outer diameter of at least one refrigerant pipe is smaller than
when R410A refrigerant is used. Therefore, the indoor unit can be
downsized and the installation space therefor can be reduced.
[0010] An indoor unit according to one or more embodiments of the
present invention includes a heat exchanger and a plurality of
refrigerant pipes. The indoor unit can constitute a refrigeration
apparatus including a refrigerant circuit. R32 refrigerant is
enclosed in the refrigerant circuit. At least one of the plurality
of refrigerant pipes has an outer diameter of 2/8 inches or less.
The refrigeration apparatus has a rated capacity of 7.1 kW or
more.
[0011] With this configuration, the R32 refrigerant is used, and
the outer diameter of at least one refrigerant pipe is 2/8 inches
or less. In a case where R410A refrigerant is used, it is often
difficult to reduce the outer diameter of the refrigerant pipe to
such a level. Therefore, the indoor unit can be downsized and the
installation space therefor can be reduced.
[0012] An indoor unit according to one or more embodiments of the
present invention is the indoor unit according to the first or
second aspect, wherein the plurality of refrigerant pipes includes
a liquid refrigerant pipe and a gas refrigerant pipe. The outer
diameter of the refrigerant pipe mentioned in the first or second
aspect is an outer diameter of the liquid refrigerant pipe.
[0013] With this configuration, the outer diameter of at least the
liquid refrigerant pipe is small. Therefore, the size reduction of
the liquid refrigerant pipe allows the indoor unit to be
downsized.
[0014] An indoor unit according to one or more embodiments of the
present invention is the indoor unit according to the third aspect,
wherein the heat exchanger includes a refrigerant flow divider. The
liquid refrigerant pipe is connected to the refrigerant flow
divider.
[0015] With this configuration, the liquid refrigerant pipe is
connected to the refrigerant flow divider of the heat exchanger. It
is therefore possible to downsize the indoor unit by reducing the
outer diameter of the liquid refrigerant pipe that is disposed to
be connected to the refrigerant flow divider.
[0016] An indoor unit according to one or more embodiments of the
present invention is the indoor unit according to any one of the
first to fourth aspects, wherein the rated capacity of the
refrigeration apparatus is in a range of 7.1 kW to 16.0 kW
inclusive.
[0017] With this configuration, the rated capacity of the
refrigeration apparatus including the indoor unit is in the range
of 7.1 kW to 16.0 kW inclusive. This makes it possible to reduce
the installation space for a refrigeration apparatus that has
relatively large rated power and is easily enlarged. The "rated
capacity" herein may alternatively be described as the "nominal
capacity" in a product catalog or an instruction manual of a
refrigeration apparatus.
[0018] A refrigeration apparatus according to one or more
embodiments of the present invention includes a refrigerant circuit
that implements a refrigeration cycle by flow of refrigerant. The
refrigeration apparatus includes an indoor unit, an outdoor unit,
and a connection pipe. The indoor unit is the one according to any
one of the first to fifth aspects. The connection pipe connects the
indoor unit and the outdoor unit.
[0019] With this configuration, at least one refrigerant pipe in
the indoor unit of the refrigeration apparatus has a small outer
diameter. Therefore, the refrigeration apparatus can be downsized
and the installation space therefor can be reduced.
[0020] The indoor units according to one or more embodiments of the
present invention are downsized, so that the installation space
therefor can be reduced.
[0021] The refrigeration apparatus according to one or more
embodiments of the present invention is downsized, so that the
installation space therefor can be reduced.
BRIEF DESCRIPTION OF DRAWINGS
[0022] FIG. 1 is a schematic diagram of a refrigeration apparatus 1
including an indoor unit 3 according to one or more embodiments of
the present invention.
[0023] FIG. 2 is a plan view of an internal configuration of the
indoor unit 3 according to one or more embodiments.
[0024] FIG. 3 is a side view of the internal configuration of the
indoor unit 3 according to one or more embodiments.
[0025] FIG. 4 is a plan view of a liquid refrigerant pipe 31 of the
indoor unit 3 according to one or more embodiments.
[0026] FIG. 5 is a side view of the liquid refrigerant pipe 31 of
the indoor unit 3 according to one or more embodiments.
[0027] FIG. 6 is a schematic diagram of a refrigeration apparatus 1
including an indoor unit 3 according to one or more
embodiments.
[0028] FIG. 7 is a schematic diagram of a refrigeration apparatus 1
including an indoor unit 3 according to one or more
embodiments.
DETAILED DESCRIPTION
[0029] Hereinafter, embodiments of the present invention and
modifications thereof will be described with reference to the
drawings. Note that a specific configuration of the indoor unit
according to the present invention is not limited to those in the
following embodiments and modifications, but can be changed without
departing from the spirit of the invention.
[0030] (1) Overall configuration of refrigeration apparatus 1
[0031] FIG. 1 illustrates a refrigeration apparatus 1 including an
indoor unit 3 according to one or more embodiments of the present
invention. The refrigeration apparatus 1 is configured as an air
conditioner, and can cool or heat the interior of a room in, for
example, a building through a vapor compression refrigeration
cycle. The refrigeration apparatus 1 includes an outdoor unit 2, an
indoor unit 3, and a liquid-refrigerant connection pipe 4 and a
gas-refrigerant connection pipe 5 that connect the outdoor unit 2
and the indoor unit 3. The outdoor unit 2, the indoor unit 3, the
liquid-refrigerant connection pipe 4, and the gas-refrigerant
connection pipe 5 constitute a vapor compression refrigerant
circuit 6. R32 refrigerant is enclosed in the refrigerant circuit
6.
[0032] A rated capacity of the refrigeration apparatus 1 is in the
range of 7.1 kW to 16.0 kW inclusive. The "rated capacity" herein
means a value equivalent to the "nominal capacity" described in a
product catalog or an instruction manual of the outdoor unit 2.
[0033] (2) Configuration of each part of refrigeration apparatus
1
[0034] (2-1) Outdoor unit 2
[0035] The outdoor unit 2 is installed outdoors. The outdoor unit 2
includes a low pressure receiver 7, a compressor 8, a four-way
switching valve 9, an outdoor heat exchanger 10, an expansion valve
11, a liquid-side shutoff valve 12, a gas-side shutoff valve 13,
and an outdoor fan 14. The compressor 8 includes a compressor body
8a and an attached receiver 8b. The outdoor unit 2 further includes
refrigerant pipes 15 to 21 that connect the parts. The
configuration of the outdoor unit 2 described here is merely an
example, and it is possible to use other configurations and parts
alternatively.
[0036] (2-2) Indoor unit 3
[0037] The indoor unit 3 is installed indoors. The indoor unit 3
includes an indoor heat exchanger 22, an indoor fan 24, a liquid
refrigerant pipe 31, and a gas refrigerant pipe 32. The indoor heat
exchanger 22 includes a refrigerant flow divider 25. The liquid
refrigerant pipe 31 connects the refrigerant flow divider 25 of the
indoor heat exchanger 22 to the liquid-refrigerant connection pipe
4. Here, the liquid refrigerant pipe 31 may be either separate from
or integral with the liquid-refrigerant connection pipe 4. The gas
refrigerant pipe 32 connects the indoor heat exchanger 22 and the
gas-refrigerant connection pipe 5. Here, the gas refrigerant pipe
32 may be either separate from or integral with the gas-refrigerant
connection pipe 5.
[0038] (2-3) Liquid-refrigerant connection pipe 4 and
gas-refrigerant connection pipe 5 The liquid-refrigerant connection
pipe 4 and the gas-refrigerant connection pipe 5 are constructed on
site when the refrigeration apparatus 1 configured as an air
conditioner is installed in an installation place in, for example,
a building. One end of the liquid-refrigerant connection pipe 4 is
connected to the liquid-side shutoff valve 12 of the outdoor unit
2. The other end of the liquid-refrigerant connection pipe 4 is
connected to a liquid-side end of the indoor heat exchanger 22 of
the indoor unit 3 directly, or indirectly through the liquid
refrigerant pipe 31 separate from the liquid-refrigerant connection
pipe 4. One end of the gas-refrigerant connection pipe 5 is
connected to the gas-side shutoff valve 13 of the outdoor unit 2.
The other end of the gas-refrigerant connection pipe 5 is connected
to a gas-side end of the indoor heat exchanger 22 of the indoor
unit 3 directly, or indirectly through the gas refrigerant pipe 32
separate from the gas-refrigerant connection pipe 5.
[0039] (3) Operation of refrigeration apparatus 1
[0040] At the time of cooling, the refrigeration apparatus 1
performs a refrigeration cycle in which the refrigerant is
circulated through the outdoor unit 2, the liquid-refrigerant
connection pipe 4, the indoor unit 3, and the gas-refrigerant
connection pipe 5 in that order. At this time, the indoor heat
exchanger 22 functions as a heat absorber that removes heat from
indoor air.
[0041] At the time of heating, the refrigeration apparatus 1
performs a refrigeration cycle in which the refrigerant is
circulated through the outdoor unit 2, the gas-refrigerant
connection pipe 5, the indoor unit 3, and the liquid-refrigerant
connection pipe 4 in that order. At this time, the indoor heat
exchanger 22 functions as a heat radiator that releases heat into
the indoor air.
[0042] (4) Detailed configuration of indoor unit 3
[0043] Generally, the indoor unit 3 is required to be installed in
a smaller space. The size of the indoor unit 3 tends to be larger
as the refrigeration apparatus 1 has a larger rated capacity. In
order to reduce the installation space for the indoor unit 3, it is
necessary to downsize the refrigerant pipes such as the liquid
refrigerant pipe 31 and the gas refrigerant pipe 32 as well as
downsizing the parts such as the indoor heat exchanger 22.
[0044] In this case, therefore, R32 refrigerant is enclosed in the
refrigerant circuit 6, and an outer diameter of the liquid
refrigerant pipe 31, among the refrigerant pipes 31 and 32, is
smaller than that in an outdoor unit used in a refrigeration
apparatus having the same rated capacity and in which R410A
refrigerant is enclosed in the refrigerant circuit 6. As described
above, the rated capacity of the refrigeration apparatus 1
according to one or more embodiments is in the range of 7.1 kW to
16.0 kW inclusive. In an indoor unit of a conventional
refrigeration apparatus having this level of rated capacity and
using R410A refrigerant, an outer diameter of a liquid refrigerant
pipe is, for example, 3/8 inches, and an outer diameter of a gas
refrigerant pipe is, for example, 5/8 inches. This is generically
referred to herein as "in the indoor unit for R410A, the outer
diameter of the refrigerant pipe is Do/8 inches".
[0045] On the other hand, an outer diameter of at least one of the
refrigerant pipes installed inside the indoor unit 3 of the
refrigeration apparatus 1 is set to (Do-1)/8 inches, which is one
size smaller than that in the indoor unit for R410A. For example,
the liquid refrigerant pipe 31 of the indoor unit 3 is manufactured
to have an outer diameter of 2/8 inches or less. With this
configuration, herein, the liquid refrigerant pipe 31 having a
reduced pipe diameter can reduce the installation space for the
indoor unit 3.
[0046] FIGS. 2 and 3 illustrate an internal configuration of the
indoor unit 3. The liquid refrigerant pipe 31 is connected to the
refrigerant flow divider 25 of the heat exchanger 22. The gas
refrigerant pipe 32 is connected to an end of the heat exchanger 22
without the refrigerant flow divider 25. As illustrated in FIGS. 4
and 5, the liquid refrigerant pipe 31 has a bent portion B1 and a
bent portion B2, which are bent. The shape of the liquid
refrigerant pipe 31 is not limited to this. For example, the liquid
refrigerant pipe 31 may have only one bent portion. Alternatively,
the liquid refrigerant pipe 31 may have three or more bent
portions.
[0047] In a case of reducing the outer diameter of the refrigerant
pipe having at least one bent portion, a bending radius of the bent
portion can be reduced as compared with before reducing the outer
diameter of the refrigerant pipe. Such a reduction in the bending
radius can lead to a further reduction in the space occupied by the
refrigerant pipe. Therefore, the bending radius is expected to be
reduced also at the bent portion B1 and the bent portion B2 in the
liquid refrigerant pipe 31 of one or more embodiments. This can
lead to a significant reduction in the installation space for the
indoor unit 3.
[0048] (5) Characteristics
[0049] (5-1)
[0050] The R32 refrigerant is used, and the outer diameter of at
least the liquid refrigerant pipe 31 is 2/8 inches or less, which
is smaller than when R410A refrigerant is used. Therefore, the
indoor unit 3 can be downsized and the installation space therefor
can be reduced.
[0051] (5-2)
[0052] The liquid refrigerant pipe 31 is connected to the
refrigerant flow divider 25 of the heat exchanger 22. It is
therefore possible to downsize the indoor unit 3 by reducing the
outer diameter of the liquid refrigerant pipe 31 that is designed
to be connected to the refrigerant flow divider 25.
[0053] (5-3)
[0054] The rated capacity of the refrigeration apparatus 1
including the indoor unit 3 is in the range of 7.1 kW to 16.0 kW
inclusive. Therefore, the refrigeration apparatus 1 having a rated
capacity in this range can be installed in a smaller space.
[0055] (5-4)
[0056] Since the refrigeration apparatus 1 includes such an indoor
unit 3, the installation space for the entire refrigeration
apparatus 1 can be reduced.
[0057] In one or more embodiments, the refrigerant circuit 6 in the
indoor unit 3 does not include an expansion valve. Alternatively,
as illustrated in FIG. 6, an indoor unit 3 may include an indoor
expansion valve 23. The indoor expansion valve 23 is provided on a
liquid refrigerant pipe 31. Therefore, the liquid refrigerant pipe
31 is divided into a first liquid pipe 33 and a second liquid pipe
34 by the indoor expansion valve 23. The first liquid pipe 33 is
connected to a heat exchanger 22 and the indoor expansion valve 23.
The second liquid pipe 34 connects the indoor expansion valve 23
and a liquid-refrigerant connection pipe 4. The second liquid pipe
34 may be either separate from or integral with the
liquid-refrigerant connection pipe 4.
[0058] An outer diameter of at least one of the refrigerant pipes
32, 33, and 34 is (Do-1)/8 inches, which is one size smaller than
Do/8 inches, i.e., the outer diameter of one of the refrigerant
pipes in the indoor unit of the refrigeration apparatus using R410
refrigerant. For example, the outer diameter of the first liquid
pipe 33 is reduced from 3/8 inches to 2/8 inches as in the above
described embodiments. With this configuration, the installation
space for the indoor unit 3 including the indoor expansion valve 23
can be reduced.
[0059] In one or more embodiments, the refrigeration apparatus 1 is
of a so-called pair type; in other words, one indoor unit 3 is
connected to one outdoor unit 2. Alternatively, as illustrated in
FIG. 7, a refrigeration apparatus 1 of a so-called multiple type
may be configured with a plurality of indoor units 3 connected to
one outdoor unit 2. Note that the indoor fan 24 is not illustrated
in the drawing. Alternatively, each indoor unit 3 may be a product
including the indoor expansion valve 23 according to the first
modification. This makes it possible to downsize the multiple-type
refrigeration apparatus 1.
[0060] In one or more embodiments, the refrigeration apparatus 1 is
configured as an air conditioner. Alternatively, the refrigeration
apparatus 1 may be configured as a freezer, a hot water supply
apparatus, or any other apparatus that uses a refrigeration cycle.
As a result, a refrigeration apparatus other than an air
conditioner can be downsized.
[0061] Although the disclosure has been described with respect to
only a limited number of embodiments, those skilled in the art,
having benefit of this disclosure, will appreciate that various
other embodiments may be devised without departing from the scope
of the present invention. Accordingly, the scope of the invention
should be limited only by the attached claims.
REFERENCE SIGNS LIST
[0062] 1 Refrigeration apparatus [0063] 2 Outdoor unit [0064] 3
Indoor unit [0065] 4 Liquid-refrigerant connection pipe [0066] 5
Gas-refrigerant connection pipe [0067] 6 Refrigerant circuit [0068]
22 Indoor heat exchanger [0069] 23 Indoor expansion valve [0070] 31
to 34 Refrigerant pipe
* * * * *