U.S. patent application number 13/128613 was filed with the patent office on 2011-09-08 for inverter-integrated electric compressor.
Invention is credited to Eisuke Fujimura, Jun Mizuno, Kazumi Ohsato, Makoto Shibuya, Toshimasa Shima.
Application Number | 20110217190 13/128613 |
Document ID | / |
Family ID | 42152748 |
Filed Date | 2011-09-08 |
United States Patent
Application |
20110217190 |
Kind Code |
A1 |
Mizuno; Jun ; et
al. |
September 8, 2011 |
Inverter-Integrated Electric Compressor
Abstract
Disclosed is a low-cost, inverter-integrated electric compressor
with which a high degree of design freedom is maintained, high
vibration resistance can be achieved by reliable anchoring of the
circuit components, the weight can be reduced easily, and which has
excellent operational stability. An inverter-integrated electric
compressor has a built-in motor and has a substrate provided with a
motor drive circuit including an inverter. In the
inverter-integrated electric compressor, after electric components
including the substrate have been fixed in a housing space
surrounded by a compressor housing and have been assembled, the
housing space is filled with an insulating resin, and at least a
part of the electric components are sealed by the solidified
filling resin. The inverter-integrated electric compressor is
characterized in that a resin frame, which has a concave retaining
part provided with a concave part formed in a concave shape along
the outlines of the circuit components provided on the substrate
and has a vent hole provided in the concave retaining part, is
mounted on the substrate, and a resin injection space, which can be
filled with resin, is formed between the circuit components on the
substrate and the resin frame.
Inventors: |
Mizuno; Jun; (Gunma, JP)
; Shibuya; Makoto; (Gunma, JP) ; Ohsato;
Kazumi; (Gunma, JP) ; Shima; Toshimasa;
(Gunma, JP) ; Fujimura; Eisuke; (Gunma,
JP) |
Family ID: |
42152748 |
Appl. No.: |
13/128613 |
Filed: |
November 10, 2009 |
PCT Filed: |
November 10, 2009 |
PCT NO: |
PCT/JP2009/005979 |
371 Date: |
May 10, 2011 |
Current U.S.
Class: |
417/410.1 |
Current CPC
Class: |
F04C 23/008 20130101;
F04C 2240/808 20130101; F04C 18/0215 20130101 |
Class at
Publication: |
417/410.1 |
International
Class: |
F04B 35/04 20060101
F04B035/04 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 10, 2008 |
JP |
2008-287688 |
May 18, 2009 |
JP |
2009-119604 |
Claims
1. An inverter-integrated electric compressor, incorporating a
motor and having a substrate provided with a motor drive circuit
including an inverter, wherein after electric components including
said substrate have been fixed in a housing space surrounded by a
compressor housing and have been assembled, said housing space is
filled with an insulating resin, and at least a part of said
electric components are sealed by a solidified filling resin,
wherein a resin frame, which has a concave retaining part provided
with a concave part formed in a concave shape along outlines of
circuit components provided on said substrate and has a vent hole
provided in said concave retaining part, is mounted on said
substrate, and a resin injection space, capable of being filled
with a resin, is formed between said circuit components on said
substrate and said resin frame.
2. The inverter-integrated electric compressor according to claim
1, wherein said concave part is provided with a tapered part, which
narrows down said resin injection space toward said vent hole,
around said vent hole.
3. The inverter-integrated electric compressor according to claim
1, wherein said concave part is formed substantively corresponding
to each outline of each of said circuit components on said
substrate.
4. The inverter-integrated electric compressor according to claim
1, wherein said insulating resin is filled in said resin injection
space and said housing space.
5. The inverter-integrated electric compressor according to claim
1, wherein said insulating resin is filled in said housing space
after a bonding resin is filled in said resin injection space.
6. The inverter-integrated electric compressor according to claim
5, wherein said resin frame is provided with a hole for positioning
a resin injector which injects said bonding resin.
7. The inverter-integrated electric compressor according to claim
1, wherein said resin frame is provided with a resin injecting
hole.
8. The inverter-integrated electric compressor according to claim
7, wherein each of a plurality of concave parts is provided with
said resin injecting hole.
9. The inverter-integrated electric compressor according to claim
7, wherein said concave part is provided with a tapered part, which
narrows down said resin injection space toward said resin injecting
hole, around said resin injecting hole.
10. The inverter-integrated electric compressor according to claim
1, wherein said resin frame mounted on said substrate is fixed to
said substrate by fastening.
11. The inverter-integrated electric compressor according to claim
1, wherein said compressor is mounted on a vehicle.
12. The inverter-integrated electric compressor according to claim
11, wherein said compressor is one for an air conditioning system
for vehicles.
Description
TECHNICAL FIELD OF THE INVENTION
[0001] The present invention relates to an inverter-integrated
electric compressor, and specifically relates to an
inverter-integrated electric compressor in which its design
flexibility is maintained at a high level and in which circuit
components can be firmly fixed for a low cost so as to achieve high
vibration resistance and excellent operational stability.
BACKGROUND ART OF THE INVENTION
[0002] For example, Patent document 1 discloses a structure of an
electric compressor which incorporates a motor drive circuit
including an inverter, in which the motor drive circuit is coated
with a resin mold material, so as to be buried into the resin mold
material.
[0003] In addition, Patent document 2 discloses a structure where a
power semiconductor module placed between a lid and a compressor
housing is coated and buried by pouring synthetic insulating resin
of a heated fluid state. In the structure disclosed in Patent
document 2, whole of the chamber which houses electric components
such as a power semiconductor module is filled with resin mold
material.
PRIOR ART DOCUMENTS
Patent documents
[0004] Patent document 1: JP2002-70743-A [0005] Patent document 2:
JP4-80554-A
SUMMARY OF THE INVENTION
Problems to be Solved by the Invention
[0006] However in the above-described conventional structures,
because the electric components are fixed substantively by coating
resin only, it is difficult for sufficient fixation force to be
ensured. Therefore in operation of the compressor, long-time
vibration and coating resin hardness decrease in a high-temperature
region tend to degrade the fixation force of the coating resin, so
that it has been difficult for the electric components to be
prevented from being displaced undesirably. Further, even in a case
where larger electric components, such as a capacitor, are used in
order to improve the inverter function in an inverter-integrated
electric compressor, there has been a problem that the thickness of
the coating resin decreased substantively and therefore sufficient
fixation force cannot be easily ensured.
[0007] Furthermore, because the structure is such that the motor
drive circuit, etc., is substantively buried, the amount of filled
resin or coating resin increases, and by just as much, the electric
compressor is blocked from reducing its weight or cost as a whole.
An electric compressor used in an automotive air conditioning
system in particular is required to be reduced in weight and cost
as much as possible.
[0008] Therefore an object of the present invention is to provide a
low-cost inverter-integrated electric compressor having excellent
operation stability, which can achieve a high vibration resistance
by firmly fixing circuit components and can be easily reduced in
weight while the design flexibility is maintained at a high
level.
Means for Solving the Problems
[0009] To achieve the above-described object, an
inverter-integrated electric compressor according to the present
invention is an inverter-integrated electric compressor,
incorporating a motor and having a substrate provided with a motor
drive circuit including an inverter, wherein after electric
components including the substrate have been fixed in a housing
space surrounded by a compressor housing and have been assembled,
the housing space is filled with an insulating resin, and at least
a part of the electric components are sealed by a solidified
filling resin, characterized in that a resin frame, which has a
concave retaining part provided with a concave part formed in a
concave shape along outlines of circuit components provided on the
substrate and has a vent hole provided in the concave retaining
part, is mounted on the substrate, and a resin injection space,
capable of being filled with a resin, is formed between the circuit
components on the substrate and the resin frame.
[0010] In such an inverter-integrated electric compressor, because
the resin is filled in the resin injection space, which is formed
around the circuit components on the substrate, so as to prevent
the circuit components from vibrating and because the resin frame
coating circumference of the resin injection space is mounted on
the substrate, the solidified resin which is filled in the resin
injection space and the circuit components coated by the resin, can
be firmly fixed by the resin frame, so that the vibration is
effectively prevented. In addition, the thickness of the resin
injection space formed in the resin frame can be set much thinner
than that in a conventional case where circuit components are
buried by substantively a single resin. Therefore harmful effects
of characteristic change of resin material, such as decrease of
hardness of coating resin in a high temperature region, can be
minimized and fixation force of the circuit components can be
ensured and maintained sufficiently, under various operational
conditions. Consequently, even when the compressor is operated for
a long term, possible undesirable displacement of electric
components can be surely suppressed and troubles derived from
vibration can be effectively prevented, so as to achieve a
compressor which is excellent in operational stability.
[0011] Further, members made of resin are excellent in being
machined, so as to be formed into various shapes. Therefore a
low-cost resin frame corresponding to outlines of conventional
circuit components can be easily manufactured, and applications of
the present invention make it possible for the design flexibility
of a compressor to be maintained at almost the same high level as
that of conventional ones without a resin frame. Furthermore,
larger circuit components such as a capacitor can be also available
as ensuring the fixation force of the circuit components.
[0012] Furthermore, a vent hole provided on the resin frame can
prevent bubbles from generating and remaining in the resin at the
time of filling the resin into resin injection space, so as to
achieve fixation of the circuit components more surely.
[0013] In the present invention, if the resin frame is made of a
material, of which density is less than that of the insulating
resin, a further lightweight compressor can be achieved. As
described above, because the resin frame is excellent in being
machined, the injected amount of the insulating resin can be
reduced as increasing the thickness of the resin frame made of
low-density resin, so as to achieve a further lightweight
compressor easily.
[0014] It is preferable that the concave part is formed
substantively corresponding to each outline of each of the circuit
components on the substrate, though that is not limited. When the
resin filled around the circuit components has a nonuniform
thickness, a nonuniform force is applied to the circuit components
through characteristic change of the resin layer, such as changes
of hardness and expansion ratio derived from high temperature, and
unexpected tiny displacement of the circuit components arrangement
might be caused. On the other hand, when the concave part is formed
corresponding to each outline of the circuit components, the resin
layer has an almost uniform thickness and therefore the
displacement can be minimized, so that the fixation force of the
circuit components by the resin layer is stably maintained even in
a high-temperature region.
[0015] In addition, it is desirable that the concave part is
provided with a tapered part, which narrows down the resin
injection space toward the vent hole, around the vent hole. Such a
tapered dent is formed on the inner surface around the vent hole as
narrowing the cross-sectional area of the resin injection space
toward the vent hole in the neighborhood of the vent hole.
Therefore when the resin is filled in the resin injection space of
the concave part, gas such as an air tends to be led into the vent
hole, so as to achieve a structure which prevents the air from
remaining in the resin. Particularly in a case where the vent hole
is formed on an upper base of the concave part, bubbles in the
resin can be surfaced to the outside of the resin by a buoyant
force, so that the bubbles are effectively prevented from remaining
in the resin. Besides, it is not necessary for the tapered part to
be formed in all of the concave parts. For example, it is possible
for the tapered part to be formed only in concave parts which are
formed as corresponding to outlines of aluminium electrolytic
capacitors. When the tapered part is formed only in the concave
part corresponding to the circuit component such as an aluminium
electrolytic capacitor, because its mounted position on the
substrate is comparatively high and therefore concave part, which
corresponds thereto, tends to leave bubbles, it is possible to
efficiently machine for preventing bubbles from remaining.
[0016] The kind of the resin filled in the resin injection space is
not limited. Therefore it may be the same as the insulating resin
filled in the housing space, and alternatively, different resins
can be used. When the same resin is used in the resin injection
space and the housing space, it is preferable that the insulating
resin is filled in the resin injection space and the housing space
at the same time, from a viewpoint of reduction of manpower and
productive cost.
[0017] On the other hand when using another kind of resin different
from the insulating resin, the resin filled in the resin injection
space is preferably a bonding resin, such as an adhesive agent. It
is specifically preferable that it is a bonding resin which has an
insulation performance capable of protecting the circuit components
on the substrate from defects such as short circuit caused by
insufficient insulation, though that is not always necessary. Here,
the bonding resin implies a resin which shows declination of the
hardness in a high temperature region at a ratio smaller than the
insulating resin which is filled in the housing space. Because such
a resin changes its hardness little, the fixation force of the
circuit component of high temperature is maintained at a level
higher than the insulation resin, so that the operational stability
of the compressor is improved. Besides, it is preferable that the
bonding resin is filled in the resin injection space before the
insulating resin is filled in the housing space.
[0018] As described above, in a case where the bonding resin is
filled in the resin injection space, it is preferable that the
resin frame is provided with a hole for positioning a resin
injector which injects the bonding resin, though that is not always
necessary. Here, it is necessary for the hole for positioning to be
configured to promptly place the resin injector which injects the
bonding resin at a predetermined position. However, it is not
necessary for it to penetrate the resin frame. For example, it is
possible that the hole for positioning comprises at least one
convex dent which is formed on a surface of the resin frame as
corresponding to a shape of a contact section which contacts the
resin frame, the contact section being on the resin injector which
injects the bonding resin. Such a hole for positioning makes it
possible to shorten the time required for the compressor production
process, as the injection of the bonding resin is made easy.
[0019] It is preferable that the resin frame is provided with a
resin injecting hole, though that is not always necessary. In a
case where a plurality of the concave parts are provided, it is
particularly preferable that each of the plurality of concave parts
is provided with the resin injecting hole. Such a resin injecting
hole makes it possible to surely achieve the fixation of the
circuit components as a tight injection of the resin injection
space into the resin injection space is made easy. The resin
injecting hole may be the same hole as the vent hole, and
alternatively can be another hole.
[0020] Even in a case where the resin injecting hole is formed as
another hole, like the vent hole, it is preferable that the concave
part is provided with a tapered part, which narrows down the resin
injection space toward the resin injecting hole, around the resin
injecting hole. When the tapered dent is formed on an inner surface
around the resin injecting hole, the cross-sectional area of the
resin injection space narrows as approaching the resin injecting
hole. Therefore when the resin is filled in the resin injection
space of the concave part, gas such as air comes to tend to be led
to the resin injecting hole, so as to achieve a structure where
bubbles are not likely to remain in the resin. Particularly in a
case where the resin injecting hole is formed on an upper base of
the concave part, bubbles in the resin can be surfaced to the
outside of the resin by a buoyant force, so that the bubbles are
effectively prevented from remaining in the resin.
[0021] The resin frame according to the present invention is
preferably mounted on the substrate as fixed to the substrate by
fastening, though that is not always necessary. When the resin
frame is fastened to the substrate, the displacement of the resin
frame from a predetermined position is prevented in filling the
resin into the resin injection space or the housing space.
Therefore bubble generation or unsuccessful filling process in the
resin caused by such a displacement is prevented, so as to surely
achieve to fix the circuit components.
[0022] Because the inverter-integrated electric compressor
according to the present invention can achieve a sure fixation of
circuit components at a low cost as keeping the high design
flexibility, it is suitable as a compressor for vehicles, where a
high vibration resistance is required and its mounting space is
strictly limited. It is specifically suitable for a compressor used
in an air conditioning system for vehicles, though its application
is not limited.
EFFECT ACCORDING TO THE INVENTION
[0023] Thus the inverter-integrated electric compressor according
to the present invention makes it possible to achieve a high
vibration resistance through a sure fixation of the circuit
components as keeping its design flexibility at a high level, and
therefore a low-cost inverter-integrated electric compressor which
can be easily made lightweight and is excellent in its operational
stability can be achieved.
BRIEF EXPLANATION OF THE DRAWINGS
[0024] FIG. 1 is a FIG. 1 is a schematic longitudinal sectional
view of an inverter-integrated electric compressor according to an
embodiment of the present invention.
[0025] FIG. 2 is a schematic perspective view of a housing space
forming part of the inverter-integrated electric compressor in FIG.
1, where FIG. 2 (A) shows a state before mounting a resin frame and
FIG. 2 (B) shows a state after mounting the resin frame.
[0026] FIG. 3 shows a substrate and a resin frame of the
inverter-integrated electric compressor in FIG. 1, where FIG. 3 (A)
is a plan view and FIG. 3 (B) is a side view, respectively.
[0027] FIG. 4 is an enlarged sectional view of the neighborhood of
a concave part of the inverter-integrated electric compressor shown
in FIG. 1, where FIG. 4 (A) shows an example of a resin injection
space filled with an insulating resin and FIG. 4 (b) shows an
example of the resin injection space filled with a bonding resin,
respectively.
[0028] FIG. 5 shows a modified example of the resin frame shown in
FIG. 3, where FIG. 5 (A) is a plan view and FIG. 5 (B) is a partial
sectional view, respectively.
[0029] FIG. 6 is an enlarged sectional view of the neighborhood of
a concave part in a modified example of the resin frame shown in
FIG. 3.
EMBODIMENTS FOR CARRYING OUT THE INVENTION
[0030] Hereinafter, desirable embodiments will be explained as
referring to figures.
[0031] FIG. 1 shows an inverter-integrated electric compressor
according to an embodiment of the present invention, specifically
as an application of the present invention to a scroll-type
electric compressor. In FIG. 1, inverter-integrated electric
compressor 1 is provided with compression mechanism 2 consisting of
fixed scroll 3 and movable scroll 4. Movable scroll 4 can be swung
relative to fixed scroll 3 in a condition where its rotation is
prevented with ball coupling 5. Motor 7 is incorporated in
compressor housing (center housing) 6, and built-in motor 7 drives
main shaft 8 (rotation shaft) to rotate. The rotational movement of
main shaft 8 is converted into the orbital swinging movement of
movable scroll 4, through eccentric pin 9 and eccentric bush 10
which is rotatably engaged therewith. In this embodiment,
compressor housing (front housing) 12 is provided with suction port
11 for sucking refrigerant as fluid to be compressed. Sucked
refrigerant is led to compression mechanism 2 through a placement
part of motor 7. The refrigerant which has been compressed with
compression mechanism 2 is delivered to an external circuit,
through discharge hole 13, discharge chamber 14 and discharge port
16 which is provided in compressor housing (rear housing) 15.
[0032] Housing space 20 is formed by surrounding an extended
section of compressor housing 12 (front housing), and motor drive
circuit is provided in housing space 20. In more detail, motor
drive circuit 21 is provided at the external side of partition wall
22 which is formed in compressor housing 12 against the side of
refrigerant suction passageway. Motor drive circuit 21 supplies
electricity through seal terminal 23 (an output terminal of motor
drive circuit 21), which is attached thereto by penetrating
partition wall 22, and lead wire 24 to motor 7, while the
refrigerant suction passageway side and the side of motor drive
circuit 21 are sealed in the placement part of seal terminal 23. In
this embodiment, because motor drive circuit 21 is provided at the
external side of partition wall 22, at least one part of electric
components including motor drive circuit 21 can be cooled with
sucked refrigerant through partition wall 22 by heat exchange. Such
a configuration can make a structure simple because electric
components, such as high-voltage circuit 25 for motor drive having
inverter function, which tend to generate heat can be automatically
cooled adequately to maintain a predetermined specification of
motor drive circuit 21 without providing another cooling device. In
addition, such a configuration is applicable to all types of
inverter-integrated electric compressor which compresses
refrigerant as a fluid to be compressed, as well as scroll-type
electric compressor.
[0033] Motor drive circuit 21 includes IPM (Intelligent Power
Module) 25 having inverter function and control circuit 26 having a
control circuit consisting of circuit components 30, and electric
components such as capacitor 27 are provided either integrally with
it or separately from it. Motor drive circuit 21 is connected to an
external power supply (not shown) through connector 28 as an input
terminal. The aperture side to the outside of compressor housing
12, which mounts these electric components including motor drive
circuit 21, is covered as sealed with lid member 29, and these
electric components are protected by lid member 29.
[0034] On substrate 26 having the above-described control circuit,
resin frame 31, which has concave retaining sections 32 with
concave parts formed like concave shapes along profiles of circuit
components, and vent holes 33 formed on concave retaining parts 32,
is mounted, so as to form resin injection space 34, into which
resin can be filled, between circuit components placed on substrate
26 and resin frame 31. When the resin is filled into resin
injection space 34, circuit components 30 can be prevented from
vibrating, and generating and remaining of bubbles in the resin can
be prevented by vent hole 33, so that circuit components 30 are
surely fixed. In addition, resin frame 31 mounted on substrate 26
fixes firmly circuit components 30, and the solidified resin which
has been filled into resin injection space 34.
[0035] Motor drive circuit 21 and electric components, such as
capacitor 27, are placed in housing space 20, resin frame 31 is
mounted and then, insulating resin 35 is filled. Solidified
insulating resin 35 seals substantively a whole of them. As shown
in the figure, the insulating resin is limitedly filled in a
minimum range of housing space 20 in view of light weight of
compressor 1 as a whole. In addition, if resin frame 31 is made of
a material, of which density is less than that of insulating resin
35, a further lightweight compressor can be achieved.
[0036] FIG. 2 is a schematic perspective view of housing space 20
of the inverter-integrated electric compressor in FIG. 1, where
FIG. 2 (A) shows a state before mounting a resin frame and FIG. 2
(B) shows a state after mounting the resin frame. As shown in FIG.
2 (A), substrate 26 provided with a control circuit consisting of
circuit component 30 and noise filter 36 are disposed in housing
space 20. IPM 25 disposed under substrate 26 is connected through
noise filter 36 to an external power supply, so as to be protected
from conductive noises of the signal wire caused by the external
power supply.
[0037] FIG. 2 (B) shows a state where resin frame 31, which has
concave retaining part 32 with a concave part formed like concave
shape along the profile of circuit component 30, and vent hole 33
formed on concave retaining part 32, is mounted on substrate 26
shown in FIG. 2 (A). As shown, resin frame 31 is formed as
corresponding to the shape of each member including circuit
component 30 in housing space 20. Therefore the other members can
be mounted without restriction, so that the design flexibility of
the compressor is maintained at the same high level as that of
conventional ones.
[0038] FIG. 3 shows an outline of a condition where resin frame 31
is mounted on substrate 26 in the inverter-integrated electric
compressor shown in FIG. 1, where FIG. 3 (A) is a plan view of
substrate 26 mounted with resin frame 31 and FIG. 3 (B) is a side
view thereof, respectively. Concave part 37, which provides concave
retaining part 32 in resin frame 31, has been formed as
substantively corresponding to each profile of circuit components
30 on the substrate. Further, because each of concave parts 37 is
provided with vent hole 33 which can be used even for filling
resin, generating and remaining of bubbles in resin injection space
34 can be effectively prevented while the resin is filled surely
into resin injection space 34 corresponding to each concave part
37. The surface of resin frame 31 is provided with positioning hole
38 for resin injector, so that the resin injection process into the
resin injection space is easily performed in a short time.
Furthermore, because both of resin frame 31 and substrate 26 are
provided with fastening section 39, resin frame 31 is mounted on
substrate 26 as being fixed to substrate 26 by fastening, so that
the displacement of resin frame 31 from a predetermined position is
prevented and circuit component 30 is surely fixed.
[0039] FIG. 4 is an enlarged sectional view of the neighborhood of
concave part 37 of substrate 26 shown in FIG. 3, specifically
showing an example where the resin is filled into resin injection
space 34 and housing space 20 after mounting resin frame 31 on
substrate 26. Besides, FIG. 4 (A) shows a case where insulating
resin 35 is filled into resin injection space 34 as well as housing
space 20. FIG. 4 (B) shows a case where insulating resin 35 is
filled into housing space 20 after bonding resin 40 is filled into
resin injection space 34. Because concave part 37 is provided with
vent hole 33 which can be used as a hole for filling resin as shown
in FIG. 4 (A), resin filling processes into resin injection space
34 and housing space 20 can be performed at the same time, so that
the resin filling process can be shortened and the cost can be cut.
In addition, bubble generation in resin injection space 34 and
housing space 20 or its remaining therein can be effectively
prevented by vent hole 33, so as to achieve fixation of circuit
component 30 surely.
[0040] As shown in FIG. 4 (B), bonding resin 40 is filled into
resin injection space 34 through vent hole 33 which can be used as
a hole for injecting resin. Because bonding resin 40 shows
declination of the hardness in a high temperature region at a ratio
smaller than insulating resin 35, fixation force of circuit
component 30 in a high temperature is maintained at a level higher
than insulating resin 34, so that the operational stability of
compressor 1 can be improved. In addition, because concave part 37
almost contacts substrate 26 at substrate facing surface 41, the
range of resin injection space 34 filled with bonding resin 40 is
limited within the region close to circuit component 30. Therefore
the cost can be cut by suppressing the usage of bonding resin 40,
and circuit component 30 and resin frame 31 can be firmly fixed
with bonding force of bonding resin 40 filled in the limited
region.
[0041] FIG. 5 shows resin frame 42 as a modified example of resin
frame 31 shown in FIG. 3, where FIG. 5 (A) is a plan view and FIG.
5 (B) is a partial sectional view. In resin frame 42, concave part
44, which forms concave retaining part 43, is provided with vent
hole 45 capable of being used even as a hole for injecting resin.
The inner surface of upper base 46 of concave part 44 is provided
with tapered part 48 which narrows down resin injection space 47
toward vent hole 45. Because such tapered part 48 is formed in
upper base 46 of concave part 44, it is easy for gas such as air to
be vented from resin retaining space 47, so that the bubble is
surely prevented from remaining in the filling resin.
[0042] FIG. 6 is an enlarged sectional view of substrate 26 shown
in FIG. 3 in the neighborhood of concave part 44, specifically
showing an example where the resin is filled into resin injection
space 47 and housing space 20 after mounting resin frame 42 on
substrate 26. Besides, FIG. 6 shows a case where insulating resin
35 is filled into resin injection space 47 as well as housing space
20. Because concave part 44 is provided with vent hole 45 which can
be used as a hole for filling resin as shown in FIG. 6, resin
filling processes into resin injection space 47 and housing space
20 can be performed at the same time, so that the resin filling
process can be shortened and the cost can be cut. In addition,
bubble generation in resin injection space 47 and housing space 20
or its remaining therein can be further prevented by tapered part
48 provided around vent hole 45 on upper base 46 of concave part
44, so as to achieve fixation of circuit component 30 surely.
INDUSTRIAL APPLICATIONS OF THE INVENTION
[0043] The present invention is applicable to all types of
inverter-integrated electric compressor, and specifically suitable
for an inverter-integrated electric compressor for automotive air
conditioning systems which requires excellent operation stability,
excellent vibration durability, high design flexibility and
achievement of downsizing and lightweight.
EXPLANATION OF SYMBOLS
[0044] 1: inverter-integrated electric compressor [0045] 2:
compression mechanism [0046] 3: fixed scroll [0047] 4: movable
scroll [0048] 5: ball coupling [0049] 6: compressor housing (center
housing) [0050] 7: motor [0051] 8: main shaft [0052] 9: eccentric
pin [0053] 10: eccentric bush [0054] 11: suction port [0055] 12:
compressor housing (front housing) [0056] 13: discharge hole [0057]
14: discharge chamber [0058] 15: compressor housing (rear housing)
[0059] 16: discharge port [0060] 20: housing space [0061] 21: motor
drive circuit [0062] 22: partition wall [0063] 23: seal terminal
[0064] 24: lead wire [0065] 25: IPM [0066] 26: substrate [0067] 27:
capacitor [0068] 28: connector [0069] 29: lid member [0070] 30:
circuit component [0071] 31, 42: resin frame [0072] 32, 43: concave
retaining part [0073] 33, 45: vent hole [0074] 34, 47: resin
injection space [0075] 35: insulating resin [0076] 36: noise filter
[0077] 37, 44: concave part [0078] 38: positioning hole [0079] 39:
fastening part [0080] 40: bonding resin [0081] 41: substrate facing
surface of concave part [0082] 46: upper base of concave part
[0083] 48: tapered part
* * * * *