U.S. patent application number 16/329391 was filed with the patent office on 2019-06-27 for electric compressor.
This patent application is currently assigned to IHI Corporation. The applicant listed for this patent is IHI Corporation. Invention is credited to Kuniaki IIZUKA, Tatsumi INOMATA, Takashi MORI, Takuya OZASA, Yuji SASAKI, Takashi YOSHIDA, Ryosuke YUMOTO.
Application Number | 20190195240 16/329391 |
Document ID | / |
Family ID | 61300722 |
Filed Date | 2019-06-27 |
United States Patent
Application |
20190195240 |
Kind Code |
A1 |
IIZUKA; Kuniaki ; et
al. |
June 27, 2019 |
ELECTRIC COMPRESSOR
Abstract
Provided is an electric compressor which includes a motor which
rotates a rotary shaft of a impeller; a housing which accommodates
the motor; a plate attached to the housing mounted with a control
circuit configured to drive and control the motor; and a
refrigerant flow passage provided between the housing and the
plate. At least a part of the refrigerant flow passage is formed by
a heat radiation fin provided on at least one of the housing and
the plate.
Inventors: |
IIZUKA; Kuniaki; (Koto-ku,
JP) ; YOSHIDA; Takashi; (Koto-ku, JP) ;
SASAKI; Yuji; (Koto-ku, JP) ; INOMATA; Tatsumi;
(Koto-ku, JP) ; OZASA; Takuya; (Koto-ku, JP)
; YUMOTO; Ryosuke; (Koto-ku, JP) ; MORI;
Takashi; (Koto-ku, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
IHI Corporation |
Koto-ku |
|
JP |
|
|
Assignee: |
IHI Corporation
Koto-ku
JP
|
Family ID: |
61300722 |
Appl. No.: |
16/329391 |
Filed: |
August 2, 2017 |
PCT Filed: |
August 2, 2017 |
PCT NO: |
PCT/JP2017/028024 |
371 Date: |
February 28, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F25B 31/026 20130101;
F04D 29/582 20130101; F04D 25/06 20130101; F04D 29/58 20130101;
F04B 39/06 20130101; F04B 39/00 20130101; F25B 31/006 20130101 |
International
Class: |
F04D 29/58 20060101
F04D029/58; F04D 25/06 20060101 F04D025/06; F25B 31/00 20060101
F25B031/00 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 1, 2016 |
JP |
2016-171000 |
Claims
1.-6. (canceled)
7. An electric compressor comprising: a motor which rotates a
rotary shaft of an impeller; a housing which accommodates the
motor; a plate attached to the housing and mounted with a control
circuit configured to drive and control the motor; and a
refrigerant flow passage provided between the housing and the
plate, wherein at least a part of the refrigerant flow passage is
formed by a heat radiation fin provided on at least one of the
housing and the plate.
8. The electric compressor according to claim 7, wherein the heat
radiation fin is provided on both the housing and the plate.
9. The electric compressor according to claim 8, wherein the heat
radiation fin provided on the housing side and the heat radiation
fin provided on the plate side are alternately arranged.
10. The electric compressor according to claim 7, further
comprising: a pair of bearings disposed to sandwich the motor
therebetween and supporting the rotary shaft, wherein the housing
includes a partition wall between one bearing on the side closer to
the plate among the pair of bearings and the plate, and a bearing
support portion which supports the one bearing is provided inside
the partition wall, and the refrigerant flow passage is provided
outside the partition wall facing the bearing support portion.
11. The electric compressor according to claim 7, wherein the
refrigerant flow passage is a one-pass meandering flow passage
having a folded portion, and the folded portion is bent.
12. The electric compressor according to claim 7, wherein a surface
area facing the refrigerant flow passage is larger on the plate
side than on the housing side.
Description
TECHNICAL FIELD
[0001] The present disclosure relates to an electric
compressor.
BACKGROUND ART
[0002] An electric compressor in which a compression unit and a
motor are integrated is known. For example, Patent Literature 1
discloses an electric compressor for compressing a refrigerant
which includes a housing for accommodating a motor, and a control
circuit such as a motor drive circuit. The control circuit is
mounted on a substrate plate, and the substrate plate is fixed to
an outer surface of a peripheral wall of the housing. On the other
hand, a suction path of a refrigerant gas serving as a refrigerant
flow passage is present in the housing, and heat radiation fins
protruding inward are provided on the peripheral wall of the
housing. The heat radiation fins can increase a surface area for
cooling the housing.
CITATION LIST
Patent Literature
[0003] Patent Literature 1: Japanese Unexamined Patent Publication
No. 2002-174178
SUMMARY OF INVENTION
Technical Problem
[0004] However, in related art, although it is advantageous for
cooling of the housing, there remains a problem in cooling of the
control circuit indirectly cooled via the housing.
[0005] The present disclosure describes an electric compressor that
can efficiently and effectively cool both the housing and the
control circuit with a common refrigerant flow passage.
Solution to Problem
[0006] An aspect of the present disclosure is an electric
compressor including: a motor which rotates a rotary shaft of an
impeller; a housing which accommodates the motor; a plate attached
to the housing and mounted with a control circuit configured to
drive and control the motor; and a refrigerant flow passage
provided between the housing and the plate. At least a part of the
refrigerant flow passage is formed by a heat radiation fin provided
on at least one of the housing and the plate.
Advantageous Effects of Invention
[0007] According to some aspects of the present disclosure, both
the housing and the control circuit can be efficiently and
effectively cooled by the common refrigerant flow passage.
BRIEF DESCRIPTION OF DRAWINGS
[0008] FIG. 1 is a cross-sectional view of an electric compressor
according to an embodiment of the present disclosure.
[0009] FIG. 2 is a cross-sectional view of the refrigerant flow
passage according to the embodiment, FIG. 2(a) is a cross-sectional
view taken along line II-II of FIG. 1, and FIG. 2(b) is a
cross-sectional view taken along line b-b of FIG. 2(a).
[0010] FIG. 3 is a view corresponding to FIG. 2, and is a
cross-sectional view illustrating a first modified example of the
refrigerant flow passage.
[0011] FIG. 4 is a view corresponding to FIG. 2, and is a
cross-sectional view illustrating a second modified example of the
refrigerant flow passage.
DESCRIPTION OF EMBODIMENTS
[0012] An aspect of the present disclosure is an electric
compressor which includes a motor which rotates a rotary shaft of
an impeller, a housing which accommodates the motor, a plate which
is attached to the housing and on which a control circuit
configured to drive and control the motor is mounted, and a
refrigerant flow passage provided between the housing and the
plate, wherein at least a part of the refrigerant flow passage is
formed by heat radiation fins provided on at least one of the
housing and the plate.
[0013] In the electric compressor, since the refrigerant flow
passage is formed between the housing and the plate, it is possible
to efficiently and effectively cool both the control circuit
mounted on the plate and the housing. Further, the refrigerant flow
passage is formed by the heat radiation fins, and the heat
radiation fins are provided on at least one of the housing and the
plate. As a result, it is also possible to positively provide the
heat radiation fins on a side desired to be preferentially cooled
among the housing and the control circuit, and it is also possible
to efficiently cool the housing and the control circuit.
[0014] In some embodiments, it is possible to provide the electric
compressor in which the heat radiation fin is provided on both the
housing and the plate. It is possible to more effectively cool both
the housing and the control circuit mounted on the plate.
[0015] In some embodiments, it is possible to provide the electric
compressor in which the heat radiation fins provided on the housing
side and the heat radiation fins provided on the plate side are
alternately arranged. The refrigerant flow passage is formed
between the heat radiation fins and the heat radiation fins
arranged alternately. As a result, it is advantageous for cooling
of both the housing and the control circuit mounted on the plate
without deviation.
[0016] In some embodiments, it is possible to provide the electric
compressor which thither includes a pair of bearings disposed to
sandwich the motor therebetween and supporting the rotary shaft,
wherein the housing includes a partition wall between one bearing
on the side closer to the plate among the pair of bearings and the
plate, and a bearing support portion which supports the one bearing
is provided inside the partition wall, and the refrigerant flow
passage is provided outside the partition wall facing the bearing
support portion. One bearing can also be effectively cooled via the
bearing support portion.
[0017] In some embodiments, it is possible to provide the electric
compressor in which the refrigerant flow passage is a one-pass
meandering flow passage having a folded portion, and the folded
portion curves. The curving of the folded portion makes it possible
to prevent the retention of the refrigerant passing through the
refrigerant flow passage.
[0018] In some embodiments, it is possible to provide the electric
compressor in which the surface area facing the refrigerant flow
passage is larger on the plate side than on the housing side. It is
possible to effectively cool the control circuit mounted on the
plate.
[0019] Hereinafter, an embodiment of the present disclosure will be
described with reference to the drawings. Incidentally, in the
description of the drawings, the same elements are denoted by the
same reference numerals, and repeated description will not be
provided.
[0020] An electric compressor 1 according to an embodiment will be
described with reference to FIG. 1. As illustrated in FIG. 1, the
electric compressor 1 is applied to, for example, an internal
combustion engine of a vehicle or a ship. The electric compressor 1
is provided with a compressor 7. The electric compressor 1 rotates
a compressor impeller (an example of an impeller) 8 by an
interaction between a rotor unit 13 and a stator unit 14 to
compress a fluid such as air and to generate compressed air. A
motor 5 is formed by the rotor unit 13 and the stator unit 14.
[0021] The electric compressor 1 includes a rotary shaft 12
rotatably supported within a housing 2, and the compressor impeller
8 fixed to a front end portion (one end portion) 12a of the rotary
shaft 12. The housing 2 includes a motor housing 3 that houses the
motor 5 (the rotor unit 13 and the stator unit 14), and an inverter
housing 4 that closes an opening of the other end side (a right
side in the drawing) of the motor housing 3. A compressor housing 6
which accommodates the compressor impeller 8 is provided on one end
side (a left side in the drawing) of the motor housing 3. The
compressor housing 6 includes a suction port 9, a scroll portion
10, and a discharge port 11.
[0022] The rotor unit 13 is fixed to a central portion of the
rotary shaft 12 in an axial direction, and includes one or a
plurality of permanent magnets (not illustrated) attached to the
rotary shaft 12. The stator unit 14 is fixed to an inner surface of
the motor housing 3 to surround the rotor unit 13, and includes a
coil portion (not illustrated) in which a conductive wire is wound.
When an alternating current flows in the coil portion of the stator
unit 14 through the conductive wire, the rotary shaft 12 and the
compressor impeller 8 rotate integrally due to the interaction
between the rotor unit 13 and the stator unit 14. When the
compressor impeller 8 rotates, the compressor impeller 8 sucks
outside air through the suction port 9, compresses the air through
the scroll portion 10, and discharges the air from the discharge
port 11. The compressed air discharged from the discharge port 11
is supplied to the aforementioned internal combustion engine.
[0023] The electric compressor 1 includes two bearings 20A and 20B
that rotatably support the rotary shaft 12 with respect to the
housing 2. The bearings 20A and 20B are attached to the rotary
shaft 12 by, for example, press-fitting or fitting with a gap. The
bearings 20A and 20B are disposed to sandwich the motor 5, and
support the rotary shaft 12 by holding two points. One bearing 20A
is provided at the end portion of the motor housing 3 on the
compressor impeller 8 side. The other bearing 20B is provided on a
support wall portion 23 that protrudes from the inverter housing 4
in the axial direction of the rotary shaft 12.
[0024] The inverter housing 4 is provided with a mechanism for
supplying a driving current to the stator unit 14. The inverter
housing 4 includes a disc-shaped end wall portion (an example of a
partition wall) 21 that closes an opening on the other end side of
the motor housing 3, and a peripheral wall portion 22 that connects
the outer peripheral portion of the end wall portion 21 and the
motor housing 3. A conductive wire 14a connected to the stator unit
14 is accommodated in the peripheral wall portion 22. The end wall
portion 21 is made of, for example, aluminum, but stainless steel
or carbon steel can also be adopted.
[0025] The above-described support wall portion (an example of the
bearing support portion) 23 has a base portion 41 protruding from
the center of the end wall portion 21 toward the inner side of the
rotary shaft 12 in the axial direction, a tubular sleeve receiver
42 further protruding inward from the base portion 41, and a sleeve
43 mounted on the outer periphery of the sleeve receiver 42. An
outer ring 51 of the bearing 20B is attached to the sleeve 43 by
fitting.
[0026] A module plate 31 is fixed on a side opposite to the inner
side of the end wall portion 21, that is, on the outer side the
rotary shaft 12 in the axial direction. On the module plate 31, a
module (an example of a control circuit) 32 which accommodates a
control unit such as an inverter is mounted. A driving control of
the electric motor is performed by the control unit of the module
32. A bus bar 33 is connected to the conductive wire 14a. The bus
bar 33 penetrates the end wall portion 21 and is connected to the
module 32. The bus bar 33 is a conductive member for supplying a
driving current, and is made of, for example, copper. Incidentally,
as the module plate 31, aluminum, copper, and other metal plates
can be adopted.
[0027] A refrigerant flow passage 60 is formed between the module
plate 31 and the end wall portion 21. More specifically, the
support wall portion 23 which supports the bearing 20B is provided
inside the end wall portion 21. The refrigerant flow passage 60 is
provided between the end wall portion 21 facing the support wall
portion 23 and the module plate 31. The inner sides of the module
32 of the module plate 31 and the inverter housing 4 are cooled by
a refrigerant Re (for example, refrigerant gas) passing through the
refrigerant flow passage 60. An inlet 61 and an outlet 62 (see FIG.
2) exist in the refrigerant flow passage 60. An inlet pipe 61a of
the refrigerant flow passage 60 is connected to the inlet 61, and a
discharge pipe 62a of the refrigerant flow passage 60 is connected
to the outlet 62. Further, the discharge pipe 62a may be connected
to a refrigerant flow passage 3a of the motor housing 3. In this
case, for example, the refrigerant Re passes through the
refrigerant flow passage 60 of the inverter housing 4, and
thereafter is introduced into the refrigerant flow passage 3a of
the motor housing 3.
[0028] As illustrated in FIG. 2, the module plate 31 is disposed to
close the refrigerant flow passage 60. In the present embodiment,
the refrigerant flow passage 60 that connects the single inlet 61
and the single outlet 62 in one pass will be described as an
example. However, for example, an aspect may be adopted in which
the refrigerant flow passage 60 branches from the single inlet 61
into a plurality of flow passages and is connected to a plurality
of outlets 62. Further, an aspect may be adopted in which the
refrigerant flow passage 60 is integrated into a single flow
passage from a plurality of inlets 61 and connected to a single
outlet 62. Further, an aspect may be adopted in which the plurality
of inlets 61 and the plurality of outlets 62 are connected to each
other. Furthermore, the refrigerant flow passage 60 may be the
plurality of independent flow passages.
[0029] The refrigerant flow passage 60 is formed by a substantially
rectangular recess 63 formed in the inverter housing 4 and heat
radiation fins 64A and MB arranged in the recess 63. Further, the
inlet 61 and the outlet 62 of the refrigerant Re are formed in the
inverter housing 4. Further, in the inverter housing 4, a seal
groove 4a is formed to surround the recess 63. A seal member 4b
such as an O-ring is mounted in the seal groove. The seal member 4b
is sandwiched between the inverter housing 4 and the module plate
31 by crimping, thereby maintaining the airtightness (or liquid
tightness) of the refrigerant flow passage 60.
[0030] A plurality of heat radiation fins 64A and 64B are disposed
in the recess 63. A part of the plurality of heat radiation fins
64A and 64B protrudes from the inverter housing 4, and the other
thereof protrudes from the module plate 31. In this embodiment, for
example, three heat radiation fins 64A and 64B are juxtaposed and
the central heat radiation fin is the heat radiation fin 64A on the
inverter housing 4 side. Further, the two heat radiation fins
disposed to face each other to sandwich the central heat radiation
fin 64A are heat radiation fins 64B on the module plate 31 side.
That is, in the present embodiment, the heat radiation fins 64A on
the inverter housing 4 side and the heat radiation fins 64B on the
module plate 31 side are alternately arranged.
[0031] By arranging the plurality of heat radiation fins 64A and
64B in parallel, the refrigerant flow passage 60 is formed between
the heat radiation fins 64A and 64B. For example, the refrigerant
flow passage 60 has three folded portions 60a that go around along
the end portions 64a of the heat radiation fins 64A and 64B to form
meandering flow passages (see FIG. 2(a)). Further, the inlet 61 of
the refrigerant Re is provided at one end portion of the
refrigerant flow passage 60, and the outlet 62 is provided at the
other end portion. As a result, the refrigerant flow passage 60 is
a single (one-pass) flow passage. Further, in this embodiment, the
folded portion 60a curves to prevent retention of the refrigerant
Re. More specifically, the outer peripheral portion 60b of the
folded portion 60a is a part of the recess 63, and a part thereof
is a recessed curved surface.
[0032] The plurality of heat radiation fins 64A and 64B according
to the present embodiment are provided on both the inverter housing
4 and the module plate 31. As a result, it is possible to more
effectively cool both the inverter housing 4 and the module 32
mounted on the module plate 31. In particular, in the present
embodiment, the heat radiation fins 64A on the inverter housing 4
side and the heat radiation fins 64B on the module plate 31 side
are alternately arranged, and the refrigerant flow passage 60 is
formed between the heat radiation fins 64A and the heat radiation
fins 64B alternately arranged. As a result, it is advantageous in
cooling both the inverter housing 4 and the module 32 mounted on
the module plate 31 without deviation.
[0033] Further, in the present embodiment, the number of the heat
radiation fins 64B on the module plate 31 side is larger than the
number of the heat radiation fins 64A on the inverter housing 4
side. That is, the surface area facing the refrigerant flow passage
60 is larger on the module plate 31 side than on the inverter
housing 4 side. As a result, it is advantageous in preferentially
and effectively cooling the module 32 mounted on the module plate
31.
[0034] Further, the end wall portion 21 according to the present
embodiment partitions between the bearing 20B, which is on the side
close to the module plate 31 among the pair of bearings 20A and
20B, and the module plate 31. Here, the support wall portion 23
which supports the bearing 20B is provided inside the end wall
portion 21. The refrigerant flow passage 60 is provided on the
outer side of the end wall portion 21 facing the support wall
portion 23 so as to overlap the support wall portion 23. In this
case, the bearing 20B can also be effectively cooled via the
support wall portion 23.
[0035] Next, first and second modified examples of the refrigerant
flow passage 60 will be described with reference to FIGS. 3 and 4.
Incidentally, in the first and second modified examples, elements
and structures common to those of the above-described refrigerant
flow passage 60 are denoted by the same reference numerals, a
description thereof will not be provided, and differences will be
mainly described.
[0036] The refrigerant flow passage 60 according to the first and
second modified examples is a meandering flow passage of one pass
as described above, and is formed by the plurality of heat
radiation fins 64A and 64B arranged in the recess 63 of the
inverter housing 4. Here, all of the heat radiation fins of the
refrigerant flow passage 60 according to the first modified example
are the heat radiation fins 64B on the module plate 31 side.
Further, the heat radiation fins of the refrigerant flow passage 60
according to the second modified example are all the heat radiation
fins 64A on the inverter housing 4 side.
[0037] As in the first modified example, by using all of the heat
radiation fins as the heat radiation fins 64B on the module plate
31 side, it is more advantageous in cooling of the module 32. On
the other hand, as in the second modified example, by using all of
the heat radiation fins as the heat radiation fins 64A on the
inverter housing 4 side, it is more advantageous in cooling of the
inside of the inverter housing 4 and the inverter housing 4.
[0038] The above-described electric compressor 1 is provided with
the common refrigerant flow passage 60 formed between the inverter
housing 4 (a part of the housing 2) and the module plate 31. With
the refrigerant flow passage 60, it is possible to efficiently and
effectively cool both the inverter housing 4 and the module 32
mounted on the module plate 31. Further, the refrigerant flow
passage 60 is formed by the heat radiation fins 64A and 64B, and
the heat radiation fins 64A and 64B are provided on at least one of
the inverter housing 4 and the module plate 31. As a result, it is
also possible to positively provide the heat radiation fins 64A and
64B on a side desired to be preferentially cooled among the
inverter housing 4 and the module 32, and it is possible to
efficiently cool the inverter housing 4 and the module 32.
[0039] The present disclosure can be implemented in various forms
including various modifications and improvements based on knowledge
of those skilled in the art, including the above-described
embodiments. Further, it is also possible to constitute a modified
example of each embodiment, using the technical matters described
in the above embodiment. The configurations of the embodiments may
be combined as appropriate.
[0040] Further, the present disclosure is not limited to those
applied to electric compressors for automobiles, but may be applied
to vessels and the like.
REFERENCE SIGNS LIST
[0041] 1: electric compressor, 2: housing, 4: inverter housing, 5:
motor, 8: compressor impeller (impeller), 12: rotary shaft, 20A,
20B: bearing, 21: end wall portion (partition wall), 23: support
wall portion (bearing support portion), 31: module plate (plate),
60: refrigerant flow passage, 60a: folded portion, 64A, 64B: heat
radiation fin.
* * * * *