U.S. patent application number 16/641523 was filed with the patent office on 2021-05-27 for compressor.
The applicant listed for this patent is Panasonic Intellectual Property Management Co., Ltd.. Invention is credited to Akinori FUKUDA, Daisuke FUNAKOSI, Keisuke NOBA, Hideto OKA, Kenji WATANABE.
Application Number | 20210156381 16/641523 |
Document ID | / |
Family ID | 1000005388607 |
Filed Date | 2021-05-27 |
United States Patent
Application |
20210156381 |
Kind Code |
A1 |
WATANABE; Kenji ; et
al. |
May 27, 2021 |
COMPRESSOR
Abstract
A compressor includes fixed scroll (6) and revolving scroll (7)
configuring compression mechanism (2), compression chamber (9),
intake chamber (11), discharge port (12), muffler (16), and
heat-insulating member (24) provided between fixed scroll (6) and
muffler (16). After a refrigerant gas taken into intake chamber
(11) is compressed by revolving scroll (7) revolving and
compression chamber (9) moving while changing a volume of
compression chamber (9), the refrigerant gas is discharged from
discharge port (12). The refrigerant gas discharged from discharge
port (12) is discharged into muffler space (14) formed by muffler
(16). Heat-insulating member (24) includes heat-insulating member
discharge port (25), lead valve (13), and recess (27).
Inventors: |
WATANABE; Kenji; (Shiga,
JP) ; FUKUDA; Akinori; (Shiga, JP) ; FUNAKOSI;
Daisuke; (Shiga, JP) ; OKA; Hideto; (Shiga,
JP) ; NOBA; Keisuke; (Shiga, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Panasonic Intellectual Property Management Co., Ltd. |
Osaka-shi, Osaka |
|
JP |
|
|
Family ID: |
1000005388607 |
Appl. No.: |
16/641523 |
Filed: |
August 2, 2018 |
PCT Filed: |
August 2, 2018 |
PCT NO: |
PCT/JP2018/028953 |
371 Date: |
February 24, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F04C 2240/60 20130101;
F04C 18/0261 20130101; F04C 2240/50 20130101; F04C 18/0215
20130101; F04C 2210/26 20130101; F04C 29/04 20130101 |
International
Class: |
F04C 18/02 20060101
F04C018/02 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 4, 2017 |
JP |
2017-169078 |
Claims
1. A compressor comprising: a fixed scroll and a revolving scroll
configuring a compression mechanism; a compression chamber formed
between the fixed scroll and the revolving scroll; an intake
chamber provided on an outer circumferential side of the fixed
scroll; a discharge port provided in a central part of the fixed
scroll; a muffler provided to cover the discharge port at an upper
part of the fixed scroll; and a heat-insulating member provided
between the fixed scroll and the muffler, wherein after a
refrigerant gas taken into the intake chamber is compressed by the
revolving scroll revolving and the compression chamber moving while
changing a volume of the compressor, the refrigerant gas is
discharged from the discharge port, the refrigerant gas discharged
from the discharge port is discharged into a muffler space formed
by the muffler, and the heat-insulating member includes a
heat-insulating member discharge port provided in a portion facing
the discharge port, a lead valve provided on a surface, of the
heat-insulating member, on a side opposite to a side facing the
fixed scroll, and a recess provided on the surface, of the
heat-insulating member, facing the fixed scroll and provided in a
360-degree area in a circumferential direction facing the intake
chamber.
2. The compressor according to claim 1, wherein in the
heat-insulating member, at least one of a rim of the
heat-insulating member discharge port provided corresponding to the
discharge port and an opening edge of the recess has a protruding
shape most protruding toward a side of the fixed scroll.
3. The compressor according to claim 1, wherein a portion close to
the heat-insulating member discharge port of the heat-insulating
member is fixed to the fixed scroll by a bolt.
4. The compressor according to claim 1, wherein the heat-insulating
member is formed of a porous material such as sintered metal.
5. The compressor according to claim 1, wherein a plurality of
plates is laminated to form the heat-insulating member.
6. The compressor according to claim 5, wherein the plurality of
plates includes plates having the recess.
Description
TECHNICAL FIELD
[0001] The present disclosure relates to a compressor used for a
cooling device such as a heating-cooling air conditioner and a
refrigerator, a heat pump type water heater, and the like.
BACKGROUND ART
[0002] Conventionally, a hermetic compressor used for a cooling
device, a water heater, and the like plays a role of compressing a
refrigerant gas returned from a refrigeration cycle in a
compression mechanism and sending the refrigerant gas to the
refrigeration cycle. The refrigerant gas returned from the
refrigeration cycle is supplied to a compression chamber formed in
the compression mechanism through an intake route. After that, the
refrigerant gas that has been compressed to have a high temperature
and high pressure is discharged from the compression mechanism into
an airtight container and sent from a discharge pipe provided in
the airtight container to the refrigeration cycle (for example, see
PTL 1).
[0003] FIG. 5 is a sectional view showing the compression mechanism
of the conventional scroll compressor described in PTL 1.
[0004] A low-temperature and low-pressure refrigerant gas passes
through intake pipe 101, is led to the intake chamber of fixed
scroll 102, and compressed by a volume change of compression
chamber 103 to have a high temperature and high pressure. After
that, the high-temperature and high-pressure refrigerant gas passes
through discharge port 104 at an upper part of fixed scroll 102, is
discharged into muffler space 106 configured with fixed scroll 102
and muffler 105 covering the upper part of fixed scroll 102, and is
sent from discharge pipe 108 to the refrigeration cycle through an
inside of airtight container 107 from muffler space 106.
CITATION LIST
Patent Literature
[0005] PTL 1: Unexamined Japanese Patent Publication No.
2007-247601
SUMMARY OF THE INVENTION
[0006] In the compressor having the configuration of FIG. 5,
however, the low-temperature refrigerant led to the intake chamber
of fixed scroll 102 is affected by heat (for example, being heated)
of the highest-temperature and highest-pressure refrigerant gas
discharged from discharge port 104 at the upper part of fixed
scroll 102 into muffler space 106.
[0007] As a result, the refrigerant gas expands when being confined
in compression chamber 103. Accordingly, a circulation amount of
the refrigerant gas decreases.
[0008] Moreover, since a refrigerant gas that is being compressed
in compression chamber 103 passes through fixed scroll 102 from
muffler space 106, the refrigerant gas is also affected by heat of
the high-temperature and high-pressure refrigerant gas. As a
result, the refrigerant gas expands, and a compression loss of a
refrigerant increases.
[0009] The present disclosure solves the conventional problems
described above, and an object of the present disclosure is to
provide a highly efficient compressor through suppression of a
decrease in a circulation amount of a refrigerant and reduction of
a compression loss of the refrigerant.
[0010] The compressor of the present disclosure includes a fixed
scroll and a revolving scroll configuring a compression mechanism,
a compression chamber formed between the fixed scroll and the
revolving scroll, an intake chamber provided on an outer
circumferential side of the fixed scroll, a discharge port provided
in a central part of the fixed scroll, a muffler provided to cover
the discharge port at an upper part of the fixed scroll, and a
heat-insulating member provided between the fixed scroll and the
muffler. After a refrigerant gas taken into the intake chamber is
compressed by the revolving scroll revolving and the compression
chamber moving while changing a volume of the compression chamber,
the refrigerant gas is discharged from the discharge port. The
refrigerant gas discharged from the discharge port is discharged
into a muffler space formed by the muffler. The heat-insulating
member includes a heat-insulating member discharge port provided in
a portion facing the discharge port, a lead valve provided on a
surface, of the heat-insulating member, on a side opposite to a
side facing the fixed scroll, and a recess provided on the surface,
of the heat-insulating member, facing the fixed scroll and provided
in a 360-degree area in a circumferential direction facing the
intake chamber.
[0011] By so doing, a high-temperature and high-pressure
refrigerant gas compressed in the compression chamber is discharged
from the heat-insulating member discharge port into the muffler
space. As a result, the high-temperature and high-pressure
refrigerant gas discharged into the muffler space gives an
influence of heat from the muffler space into the intake chamber.
However, against the influence of heat, the heat-insulating member
provided between the fixed scroll and the muffler serves as a
heat-insulating layer. Further, since a refrigerant gas and oil in
the refrigerant gas intrude into the recess provided in the
heat-insulating member and stay in the recess, the recess serves as
a second heat-insulating layer. These double heat-insulating layers
suppress the influence of heat from the muffler space through which
a highest-temperature and highest-pressure refrigerant passes into
the intake chamber and compression chamber before compression
starts when the fixed scroll has a lowest temperature. In
particular, the recess is provided in a 360-degree area, of the
heat-insulating member, in a circumferential direction on a surface
facing the fixed scroll. Therefore, the influence of heat from the
muffler space is extensively and effectively suppressed over a
substantially whole area of the intake chamber and the compression
chamber continued to the intake chamber. In addition, together with
the muffler space, the heat-insulating member suppresses the
influence of heat upon the compression chamber from a
high-temperature refrigerant in a space inside a container above
the muffler space. Accordingly, since an increase in a temperature
of the refrigerant is strongly suppressed (for example, blocked), a
decrease in a circulation amount of the refrigerant is prevented,
and an increase in a compression loss of the refrigerant is
suppressed. As a result, a highly efficient compressor can be
achieved.
[0012] According to the present disclosure, an increase in a
temperature of a refrigerant is suppressed, a decrease in a
circulation amount of the refrigerant is prevented, and an increase
in a compression loss of the refrigerant is suppressed. As a
result, a highly efficient compressor can be provided.
BRIEF DESCRIPTION OF DRAWINGS
[0013] FIG. 1 is a view showing one example of a cross section of a
compressor according to a first exemplary embodiment of the present
disclosure viewed from a side.
[0014] FIG. 2 is a view showing one example of a main part of the
compressor.
[0015] FIG. 3 is a plan view showing one example of a configuration
of the compressor.
[0016] FIG. 4 is a view showing one example of a heat-insulating
member of the compressor.
[0017] FIG. 5 is a view showing one example of a cross section of a
scroll compressor in a comparative example viewed from a side.
DESCRIPTION OF EMBODIMENT
[0018] The compressor of a first aspect the present disclosure
includes a fixed scroll and a revolving scroll configuring a
compression mechanism, a compression chamber formed between the
fixed scroll and the revolving scroll, an intake chamber provided
on an outer circumferential side of the fixed scroll, a discharge
port provided in a central part of the fixed scroll, a muffler
provided to cover the discharge port at an upper part of the fixed
scroll, and a heat-insulating member provided between the fixed
scroll and the muffler. After a refrigerant gas taken into the
intake chamber is compressed by the revolving scroll revolving and
the compression chamber moving while changing a volume of the
compression chamber, the refrigerant gas is discharged from the
discharge port. The refrigerant gas discharged from the discharge
port is discharged into a muffler space formed by the muffler. The
heat-insulating member includes a heat-insulating member discharge
port provided in a portion facing the discharge port, a lead valve
provided on a surface, of the heat-insulating member, on a side
opposite to a side facing the fixed scroll, and a recess provided
on the surface, of the heat-insulating member, facing the fixed
scroll and provided in a 360-degree area in a circumferential
direction facing the intake chamber.
[0019] By so doing, a high-temperature and high-pressure
refrigerant gas compressed in the compression chamber is discharged
from the heat-insulating member discharge port into the muffler
space. As a result, the high-temperature and high-pressure
refrigerant gas discharged into the muffler space gives an
influence of heat from the muffler space into the intake chamber.
However, against the influence of heat, the heat-insulating member
provided between the fixed scroll and the muffler serves as a
heat-insulating layer. Further, since a refrigerant gas and oil in
the refrigerant gas intrude into the recess provided in the
heat-insulating member and stay in the recess, the recess serves as
a second heat-insulating layer. These double heat-insulating layers
suppress the influence of heat from the muffler space through which
a highest-temperature and highest-pressure refrigerant passes into
the intake chamber and compression chamber before compression
starts when the fixed scroll has a lowest temperature. In
particular, the recess is provided in a 360-degree area, of the
heat-insulating member, in a circumferential direction on a surface
facing the fixed scroll. Therefore, the influence of heat from the
muffler space is extensively and effectively suppressed over a
substantially whole area of the intake chamber and the compression
chamber continued to the intake chamber. Moreover, together with
the muffler space, the heat-insulating member suppresses the
influence of heat from a high-temperature refrigerant in a space
inside a container above the muffler space into the compression
chamber. Accordingly, since an increase in a temperature of the
refrigerant is strongly suppressed, a decrease in a circulation
amount of the refrigerant is prevented, and an increase in a
compression loss of the refrigerant is suppressed. As a result, a
highly efficient compressor can be achieved.
[0020] In a second aspect of the present disclosure, the
heat-insulating member may have a configuration in which at least
one of a rim of the heat-insulating member discharge port provided
corresponding to the discharge port and an opening edge of the
recess has a protruding shape most protruding toward a side of the
fixed scroll.
[0021] By so doing, a portion having the protruding shape of the
heat-insulating member comes into pressure contact with the upper
surface of the fixed scroll. Accordingly, an area between the
discharge port and the recess is strongly blocked. This prevents a
decrease in a heat insulation effect by the recess due to a
circulation action generated between a high-temperature and
high-pressure refrigerant inside the discharge port and a
refrigerant inside the recess. As a result, a high heat insulation
effect by the recess is maintained. Therefore, the effect of
prevention of a decrease in the circulation amount of the
refrigerant due to an increase in the temperature of the
refrigerant, and the effect of suppression of an increase in the
compression loss of the refrigerant are further enhanced. As a
result, a highly efficient compressor can be achieved.
[0022] In a third aspect of the present disclosure, a portion close
to the heat-insulating member discharge port of the heat-insulating
member may be fixed to the fixed scroll by a bolt.
[0023] By so doing, the rim of the heat-insulating member discharge
port comes into close contact with the fixed scroll. Accordingly,
airtightness between the discharge port from which the
highest-temperature and highest-pressure refrigerant is discharged
and the recess improves. This prevents a decrease in the heat
insulation effect by the recess due to the circulation between the
high-temperature and high-pressure refrigerant inside the discharge
port and the refrigerant inside the recess. Accordingly, the high
heat insulation effect by the recess is maintained. Therefore, the
effect of prevention of a decrease in the circulation amount of the
refrigerant due to an increase in the temperature of the
refrigerant, and the effect of suppression of an increase in the
compression loss of the refrigerant are further enhanced.
[0024] As a result, a highly efficient compressor can be
achieved.
[0025] In a fourth aspect of the present disclosure, the
heat-insulating member may be formed of a porous material such as
sintered metal.
[0026] By so doing, the heat-insulating member has low heat
conductivity. Accordingly, the heat insulation effect of the
heat-insulating member is enhanced. As a result, the influence of
heat from a high-temperature and high-pressure refrigerant in the
muffler space, and the influence of heat from a refrigerant inside
the container above the muffler space are further strongly
suppressed. Therefore, a decrease in the circulation amount due to
an increase in the temperature of the refrigerant is effectively
suppressed, and an increase in the compression loss of the
refrigerant is suppressed. As a result, a highly efficient
compressor can be achieved.
[0027] In a fifth aspect of the present disclosure, a plurality of
plates may be laminated to form the heat-insulating member.
[0028] By so doing, in the heat-insulating member, heat conduction
decreases between the respective plates. Accordingly, the heat
insulation effect of the heat-insulating member is enhanced. As a
result, the influence of heat from the high-temperature and
high-pressure refrigerant in the muffler space, and the influence
of heat from the refrigerant inside the container above the muffler
space are further strongly suppressed. Moreover, among the
plurality of plates, when a thickness of plates facing the fixed
scroll is thin, the plates facing the fixed scroll have high
adhesion to the upper surface of the fixed scroll. As a result, the
circulation between the refrigerant inside the recess and the
high-temperature and high-pressure refrigerant inside the discharge
port is more reliably prevented. Therefore, a decrease in a
circulation amount due to an increase in the temperature of the
refrigerant is effectively suppressed, and an increase in the
compression loss of the refrigerant is suppressed. As a result, a
highly efficient compressor can be achieved.
[0029] In a sixth aspect of the present disclosure, the plurality
of plates may include a plate having a recess.
[0030] By so doing, a heat-insulating member having a recess is
formed without performing cutting and the like. Moreover, among the
plurality of plates, when a thickness of plates facing the fixed
scroll is thin, the plates having a recess have high adhesion to
the fixed scroll. As a result, the circulation between the
refrigerant inside the recess and the high-temperature and
high-pressure refrigerant inside the discharge port is strongly
prevented. Therefore, a decrease in the circulation amount of the
refrigerant due to an increase in the temperature is more
efficiently prevented, and an increase in the compression loss of
the refrigerant is suppressed. As a result, a highly efficient
compressor can be achieved.
[0031] Hereinafter, an exemplary embodiment of the present
disclosure will be described in detail with reference to the
drawings. Note that this exemplary embodiment does not limit the
present disclosure.
FIRST EXEMPLARY EMBODIMENT
[0032] FIG. 1 is a view showing one example of a cross section of
compressor 50 according to a first exemplary embodiment of the
present disclosure viewed from a side. FIG. 2 is a view showing one
example of a main part of compressor 50. Part (a) of FIG. 2 is a
sectional view, and part (b) of FIG. 2 is a detailed view showing
one example of a configuration of a heat-insulating member and a
fixed scroll. FIG. 3 is a plan view showing one example of a
configuration of compressor 50. Part (a) of FIG. 3 is a plan view
showing one example of heat-insulating member 24 of compressor 50.
Part (b) of FIG. 3 is a plan view showing one example of
compression chamber 9 of compressor 50.
[0033] FIG. 4 is a view showing one example of heat-insulating
member 24 of compressor 50. Part (a) of FIG. 4 is a plan view. Part
(b) of FIG. 4 is a view showing one example of a cross section.
Part (c) of FIG. 4 is a bottom view.
[0034] As shown in FIG. 1, compressor 50 of the present exemplary
embodiment includes airtight container 1, compression mechanism 2
disposed inside airtight container 1, and electric motor 3 disposed
inside airtight container 1.
[0035] Main bearing member 4 is fixed inside airtight container 1
by welding, shrinkage fitting, or the like. Shaft 5 is supported by
main bearing member 4.
[0036] Fixed scroll 6 is bolted to an upper part of main bearing
member 4. Revolving scroll 7 meshed with fixed scroll 6 is inserted
between fixed scroll 6 and main bearing member 4 so as to configure
scroll compression mechanism 2.
[0037] Rotation retaining mechanism 8 including an Oldham ring or
the like that prevents rotation of revolving scroll 7 and guides
revolving scroll 7 to have a circular orbit motion is provided
between revolving scroll 7 and main bearing member 4.
[0038] Rotation retaining mechanism 8 causes revolving scroll 7 to
have a circular orbit motion by eccentrically driving revolving
scroll 7 by eccentric shaft 5a on an upper end of shaft 5. By so
doing, compression chamber 9 formed between fixed scroll 6 and
revolving scroll 7 moves from an outer circumferential side toward
a central part while contracting a volume of compression chamber 9.
Through using of this motion, a refrigerant gas is taken in from
intake pipe 10 continued to a refrigeration cycle outside airtight
container 1 through intake chamber 11 provided in the fixed scroll
between intake pipe 10 and compression chamber 9 and always having
an intake pressure. The refrigerant gas taken in is compressed
after being confined in compression chamber 9. The refrigerant gas
that has reached a prescribed pressure pushes and opens lead valve
13 and is discharged from discharge port 12 in a central part of
fixed scroll 6.
[0039] The refrigerant gas that has been discharged after pushing
and opening lead valve 13 is discharged into muffler space 14, and
is sent to the refrigeration cycle from discharge pipe 17 through
space inside container 15 of airtight container 1. Note that
muffler space 14 is formed by muffler 16 whose circumference is
fixed by fixed scroll 6, and covers discharge port 12 and lead
valve 13.
[0040] On the other hand, pump 18 is provided on a lower end of
shaft 5 that revolves and drives revolving scroll 7. A suction port
of pump 18 is disposed so as to exist inside oil storage unit 19.
Pump 18 operates concurrently with a scroll compressor. Therefore,
pump 18 reliably pumps up oil in oil storage unit 19 provided at a
bottom of airtight container 1 regardless of a pressure condition
and an operation speed.
[0041] The oil pumped up by pump 18 is supplied to compression
mechanism 2 through oil supply hole 20 that penetrates through an
inside of shaft 5. Before or after the oil is pumped up by pump 18,
a foreign matter is removed from the oil by an oil filter or the
like. This prevents the foreign matter from being mixed into
compression mechanism 2. As a result, reliability of compression
mechanism 2 can be improved.
[0042] Pressure of the oil led to compression mechanism 2 is
approximately equivalent to a discharge pressure of the scroll
compressor. Moreover, the pressure of the oil led to compression
mechanism 2 also serves as a back pressure source for revolving
scroll 7. By so doing, revolving scroll 7 stably exerts a
prescribed compression function without leaving from or coming into
deviated contact with fixed scroll 6. Moreover, a part of the oil
intrudes into a fitting portion between eccentric shaft 5a and
revolving scroll 7, and bearing 21 between shaft 5 and main bearing
member 4, as though the oil has tried to find a place to escape by
a supply pressure and a weight of the oil, and drops after
lubricating the respective portions, to return to oil storage unit
19.
[0043] Another part of the oil supplied from oil supply hole 20 to
high pressure area 22 intrudes into back pressure chamber 23 in
which rotation retaining mechanism 8 is located through route 7a
formed by revolving scroll 7 and having a one-opening end in high
pressure area 22. The intruded oil plays a role of applying a back
pressure to revolving scroll 7 in back pressure chamber 23 in
addition to lubrication of a thrust sliding unit and a sliding unit
of rotation retaining mechanism 8.
[0044] As described above, the refrigerant gas to be compressed in
compression mechanism 2 is compressed after being taken into
compression chamber 9 between fixed scroll 6 and revolving scroll 7
via intake chamber 11 provided in fixed scroll 6. However, the
refrigerant gas to be compressed by compression mechanism 2 is
affected by heat of a highest-temperature and highest-pressure
refrigerant gas that is discharged from discharge port 12 of fixed
scroll 6 into muffler space 14.
[0045] Therefore, in the present disclosure, heat-insulating member
24 having a plate shape is provided between fixed scroll 6 and
muffler 16, and heat-insulating member 24 is configured so as to be
located between muffler space 14 and intake chamber 11. Moreover,
on a surface on a side of fixed scroll 6 in heat-insulating member
24, recess 27 (see FIGS. 3 and 4) is provided in a 360-degree area
(range) in a circumferential direction facing intake chamber
11.
[0046] Here, the 360-degree area in the circumferential direction
means that when the surface on the side of fixed scroll 6 of
heat-insulating member 24 is viewed from a front, recess 27 is
formed at 360.degree. around a substantially center part, that is,
along a whole circumference. Note that in a case of FIG. 3, recess
27 has a portion having a substantially annular shape and a portion
protruding from the substantially annular portion, but the present
disclosure is not limited to this example.
[0047] Recess 27 is connected to space inside container 15 (see
FIG. 2) via recess groove 27a.
[0048] Note that in a position, of heat-insulating member 24,
facing discharge port 12 of fixed scroll 6, heat-insulating member
discharge port 25 is formed. On a surface, of heat-insulating
member 24, opposite to the surface facing fixed scroll 6, lead
valve 13 that opens and closes heat-insulating member discharge
port 25 is provided.
[0049] Moreover, bolts (not shown) are inserted into holes 26
provided on an outer circumferential portion to fix heat-insulating
member 24 to fixed scroll 6 together with muffler 16.
[0050] In compressor 50 of the present exemplary embodiment
configured as described above, a high-temperature and high-pressure
refrigerant gas compressed in compression chamber 9 is discharged
from heat-insulating member discharge port 25 of heat-insulating
member 24 into muffler space 14. By so doing, the high-temperature
and high-pressure refrigerant gas discharged into muffler space 14
gives an influence of heat upon intake chamber 11 from muffler
space 14.
[0051] At this time, heat-insulating member 24 is located between
intake chamber 11 of fixed scroll 6 and muffler space 14, and
serves as a heat-insulating layer. By so doing, the influence of
heat of the high-temperature and high-pressure refrigerant inside
muffler space 14 upon intake chamber 11 is suppressed.
[0052] Moreover, recess 27 is formed in heat-insulating member 24.
A high-temperature and high-pressure refrigerant released into
space inside container 15 and oil inside the refrigerant intrude
into recess 27 via recess groove 27a and stay in recess 27. By so
doing, recess 27 has a lower temperature than the
highest-temperature and highest-pressure refrigerant inside muffler
space 14. Therefore, the stay of the refrigerant and oil inside
recess 27 serves as a second heat-insulating layer. By so doing, a
first heat insulation action by heat-insulating member 24 and a
second heat insulation action in recess 27 are combined together to
exert a powerful heat insulation effect.
[0053] In particular, recess 27 is provided over the 360-degree
area in the circumferential direction on the surface facing fixed
scroll 6 of heat-insulating member 24. Therefore, the influence of
heat from muffler space 14 is extensively and effectively
suppressed over a substantially whole area of intake chamber 11 and
compression chamber 9 continued to intake chamber 11.
[0054] As a result, an increase in the temperature of a refrigerant
in intake chamber 11 and compression chamber 9 by the influence of
heat from the refrigerant inside muffler space 14 is strongly
suppressed. Accordingly, a decrease in a circulation amount of the
refrigerant is prevented, volume efficiency improves, and an
increase in a compression loss of the refrigerant is suppressed. As
a result, a highly efficient compressor can be achieved.
[0055] Moreover, in the present exemplary embodiment, together with
muffler space 14, heat-insulating member 24 suppresses the
influence of heat from the high-temperature refrigerant in space
inside container 15 above the muffler space upon fixed scroll 6. As
a result, the temperature of fixed scroll 6 is maintained low. From
this perspective, a decrease in the circulation amount of the
refrigerant due to an increase in the temperature of the
refrigerant is prevented, the volume efficiency improves, and an
increase in the compression loss of the refrigerant is suppressed.
As a result, a highly efficient compressor can be achieved.
[0056] Here, in the present exemplary embodiment, as one example,
heat-insulating member 24 is formed of sintered metal. Therefore,
an increase in the temperature of the refrigerant is efficiently
suppressed. Sintered metal has low heat conductivity and a large
number of micro spaces. Since sintered metal has high heat
insulation, heat-insulating member 24 formed of sintered metal can
efficiently suppress the influence of heat from the
high-temperature refrigerant in muffler space 14 and space inside
container 15.
[0057] Through forming of heat-insulating member 24 with sintered
metal, the heat insulation effect by heat-insulating member 24 is
enhanced. Accordingly, an increase in the temperature of the
refrigerant is more efficiently suppressed, a decrease in the
circulation amount of the refrigerant is prevented, and an increase
in the compression loss of the refrigerant is suppressed. As a
result, a highly efficient compressor can be achieved.
[0058] Note that a material of heat-insulating member 24 is not
limited to a porous material such as sintered metal. For example,
as long as the material has low heat conductivity, any material
such as a resin material can be used.
[0059] Moreover, heat-insulating member 24 may be one sheet, or may
be configured through lamination of a plurality of plates. In
laminated heat-insulating member 24 configured through lamination
of the plurality of plates, heat conduction between the respective
plates is strongly suppressed. Therefore, the heat insulation
effect improves and thus this configuration is effective. Moreover,
among the plurality of plates configuring heat-insulating member
24, when a thickness of plates facing fixed scroll 6 is thin, for
example, when the thickness is as thin as approximately 1 mm,
adhesion of the plates facing fixed scroll 6 to an upper surface of
fixed scroll 6 improves. Accordingly, circulation between the
refrigerant inside recess 27 and the high-temperature and
high-pressure refrigerant inside discharge port 12 is more reliably
prevented. As a result, the heat insulation action by recess 27 is
more effectively exerted.
[0060] Note that in the present exemplary embodiment,
heat-insulating member 24 is a member having a prescribed shape in
advance. Heat-insulating member 24, however, may be formed, for
example, between fixed scroll 6 and muffler space 14 by injection
molding.
[0061] Moreover, bolts are inserted into holes 26 provided on the
outer circumferential portion of heat-insulating member 24 to fix
heat-insulating member 24 to fixed scroll 6 together with muffler
16. However, a portion close to heat-insulating member discharge
port 25 is preferably further fixed to fixed scroll 6 by bolts.
[0062] By so doing, the rim of heat-insulating member discharge
port 25 comes into close contact with fixed scroll 6 and an area
between discharge port 12 and recess 27 is strongly blocked.
Accordingly, airtightness between discharge port 12 from which the
highest-temperature and highest-pressure refrigerant is discharged
and recess 27 improves. As a result, a decrease in the heat
insulation effect of recess 27 due to the circulation between the
high-temperature and high-pressure refrigerant discharged from
discharge port 12 of fixed scroll 6 and the refrigerant inside
recess 27 is prevented. As a result, a high heat insulation effect
by recess 27 is maintained, a decrease in the circulation amount
due to an increase in the temperature of the refrigerant is
efficiently prevented, and an increase in the compression loss of
the refrigerant is suppressed. As a result, a highly efficient
compressor can be achieved.
[0063] Moreover, in heat-insulating member 24, the rime of
heat-insulating member discharge port 25 provided corresponding to
discharge port 12 of fixed scroll 6 has protruding shape 28 (see
FIG. 2) most protruding toward the side of the fixed scroll.
Therefore, a portion having protruding shape 28 strongly comes into
pressure contact with the upper surface of fixed scroll 6.
Accordingly, an area between discharge port 12 and recess 27 is
strongly blocked. Therefore, a decrease in the heat insulation
action by the refrigerant and oil inside recess 27 due to the
circulation between the high-temperature and high-pressure
refrigerant inside discharge port 12 and the refrigerant inside
recess 27 is more reliably prevented. By so doing, the heat
insulation effect by recess 27 improves. As a result, the influence
of heat by the high-temperature refrigerant inside muffler space 14
is further strongly suppressed. Accordingly, a decrease in the
circulation amount due to an increase in the temperature of the
refrigerant is more effectively prevented, and an increase in the
compression loss of the refrigerant is suppressed. As a result, a
highly efficient compressor can be achieved.
[0064] Note that, for example, instead of the rim of
heat-insulating member discharge port 25, an opening edge on a side
of the upper surface of the fixed scroll of recess 27 may have
protruding shape 28. This means that at least one of the rim of
heat-insulating member discharge port 25 and the opening edge on
the side of the upper surface of the fixed scroll of recess 27 may
have protruding shape 28. Moreover, through combination of
provision of protruding shape 28 and fixing of a bolt in the rim of
heat-insulating member discharge port 25, intrusion of the
high-temperature and high-pressure refrigerant into recess 27 is
more reliably prevented and thus this configuration is
effective.
[0065] Moreover, since heat-insulating member 24 is configured
through lamination of plates provided with recess 27 and plates
without a recess, recess 27 is formed without performing cutting.
Therefore, heat-insulating member 24 can be provided at a low cost.
In addition, since the plurality of plates provided with recess 27
and the plurality of plates without a recess are alternatively
laminated, a plurality of recesses 27 is formed in a lamination
direction. As a result, the heat insulation effect by recess 27 is
further enhanced.
[0066] Note that the influence of heat from muffler space 14 and
space inside container 15 into intake chamber 11 and compression
chamber 9 is further suppressed through formation of a
heat-insulating layer on heat-insulating member 24 and muffler 16.
Examples of the heat-insulating layer include resin coating, and
coating processing including hollow beads whose inside is vacuum or
air. However, the heat-insulating layer is not limited to these
examples.
[0067] As illustrated with reference to the exemplary embodiment
described above, the present disclosure can achieve a highly
efficient compressor by suppressing an increase in the temperature
of the refrigerant, preventing a decrease in the circulation amount
of the refrigerant, and suppressing an increase in the compression
loss of the refrigerant. The present disclosure, however, is not
limited to this exemplary embodiment. This means that the exemplary
embodiment disclosed this time should be considered as illustrative
in all respects and not restrictive. The scope of the present
disclosure is defined by the terms of the claims, rather than the
description above, and is intended to include any modifications
within the scope and meaning equivalent to the terms of the
claims.
INDUSTRIAL APPLICABILITY
[0068] As described above, the present disclosure achieves a highly
efficient compressor by suppressing an increase in a temperature of
a refrigerant, preventing a decrease in a circulation amount of the
refrigerant, and suppressing an increase in a compression loss of
the refrigerant. As a result, the present disclosure can be widely
used for various equipment using a refrigeration cycle.
REFERENCE MARKS IN THE DRAWINGS
[0069] 1, 107: airtight container [0070] 2: compression mechanism
[0071] 3: electric motor [0072] 4: main bearing member [0073] 5:
shaft [0074] 5a: eccentric shaft [0075] 6, 102: fixed scroll [0076]
7: revolving scroll [0077] 7a: route [0078] 8: rotation retaining
mechanism [0079] 9, 103: compression chamber [0080] 10, 101: intake
pipe [0081] 11: intake chamber [0082] 12, 104: discharge port
[0083] 13: lead valve [0084] 14, 106: muffler space [0085] 15:
space inside container [0086] 16, 105: muffler [0087] 17, 108:
discharge pipe [0088] 18: pump [0089] 19: oil storage unit [0090]
20: oil supply hole [0091] 21: bearing [0092] 22: high pressure
area [0093] 23: back pressure chamber [0094] 24: heat-insulating
member [0095] 25: heat-insulating member discharge port [0096] 26:
hole [0097] 27: recess [0098] 27a: recess groove [0099] 28:
protruding shape [0100] 50: compressor
* * * * *