JP2003214345A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor, in which a temperature rise of intake gas in a compression mechanism is suppressed, and lowering of volumetric efficiency of the compression mechanism is prevented. <P>SOLUTION: Coating material 64 for suppressing the heating of a compression mechanism 14 side by gas in a discharge chamber 52 is coated on an inner wall face of the discharge chamber 52. The coating material 64 suppresses heat transmission to the outside of the coating material 64, and the heating of the compression mechanism 14 side by refrigerant gas introduced in the discharge chamber 52 is suppressed. As a result, the lowering of the volumetric efficiency of the compression mechanism 14 is prevented. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor that compresses gas by operating a compression mechanism housed in a housing.

[0002]

2. Description of the Related Art As a compressor of this type, for example, Japanese Patent Laid-Open No.
There is a device having a mechanism (compression mechanism) for compressing a refrigerant gas (gas) in a housing, such as the configuration disclosed in Japanese Patent Publication No. 000-249086. In this structure, a discharge chamber (discharge chamber) into which the refrigerant gas discharged from the compression mechanism is introduced is provided in the housing. The discharge chamber is defined by a fixed scroll that constitutes the compression mechanism and a rear casing that is joined and fixed to the fixed scroll.

[0003]

However, in the above structure, the heat of the refrigerant gas in the discharge chamber is transferred to the compression mechanism joined thereto, and the intake refrigerant gas in the compression mechanism is excessively heated. It may happen. If the temperature of the suction refrigerant gas rises excessively, there arises a problem that the volumetric efficiency of the compression mechanism is lowered.

An object of the present invention is to provide a compressor capable of suppressing the temperature rise of the intake gas in the compression mechanism and suppressing the reduction of the volumetric efficiency of the compression mechanism.

[0005]

In order to solve the above problems, in the invention according to claim 1, the compressor performs gas compression by the operation of the compression mechanism housed in the housing and It has a discharge chamber into which the gas discharged from the mechanism is introduced. Further, inside the discharge chamber, heat insulating means is provided for suppressing heating of the compression mechanism side by the gas in the discharge chamber.

According to the present invention, since the heat insulating means is provided inside the discharge chamber, it becomes difficult for the gas introduced into the discharge chamber to heat the compression mechanism side. Therefore, it is difficult for the intake gas in the compression mechanism to be heated. As a result, the reduction of the volumetric efficiency of the compression mechanism is suppressed.

The term "intake gas" as used herein means a gas that is sucked into the compression mechanism or a gas that has been sucked into the compression mechanism and is subjected to a compression action. According to a second aspect of the present invention, in the first aspect of the present invention, the heat insulating means is a heat insulating material that is in close contact with the inner wall surface of the discharge chamber.

According to the present invention, the heat insulating material closely attached to the inner wall surface of the discharge chamber suppresses heat transfer to the outside of the heat insulating material. Therefore, the heating of the compression mechanism side by the gas introduced into the discharge chamber is suppressed.

According to a third aspect of the invention, in the second aspect of the invention, the heat insulating material is a coating material applied to the inner wall surface. According to the present invention, the coating material applied to the inner wall surface of the discharge chamber suppresses heat transfer to the outside of the coating material. Therefore, the heating of the compression mechanism side by the gas introduced into the discharge chamber is suppressed.

According to a fourth aspect of the invention, in the first aspect of the invention, the heat insulating means is a shield member provided so as to have a space between the heat insulating means and the inner wall surface of the discharge chamber. .

According to the present invention, the shield member provided so as to have a space between it and the inner wall surface of the discharge chamber prevents the gas introduced into the discharge chamber from directly blowing onto the inner wall surface. To be done. This prevents the heat of the gas from being directly transmitted to the inner wall surface, so that the temperature rise of the wall portion forming the inner wall surface of the discharge chamber is suppressed and the wall portion of the wall portion is prevented. Heating of the compression mechanism side due to heat is suppressed.

According to a fifth aspect of the invention, in the invention of the second or fourth aspect, the heat insulating means is fitted and fixed in the discharge chamber. According to this invention,
The heat insulation means fitted and fixed in the discharge chamber suppresses the heating of the compression mechanism side by the gas introduced into the discharge chamber.

In a sixth aspect of the present invention, the compressor performs gas compression by the operation of the compression mechanism housed in the housing, and includes a discharge chamber into which the gas discharged from the compression mechanism is introduced. There is. Further, in the compressor, at least a part of a wall portion constituting the discharge chamber is a separate body structure configured separately from the compression mechanism side, and the separate body structure is It is joined to the compression mechanism side via a heat insulating material.

According to this invention, since the separate-body structure which is formed separately from the compression mechanism side is joined to the compression mechanism side via the heat insulating material, the separate-body structure body is joined to the compression mechanism side. On the other hand, the heat transferred from the gas becomes difficult to transfer to the compression mechanism side. Therefore, it is difficult for the intake gas in the compression mechanism to be heated. As a result, the reduction of the volumetric efficiency of the compression mechanism is suppressed.

According to a seventh aspect of the invention, in the sixth aspect of the invention, the heat insulating material is a rubber sealing member. According to the present invention, the transfer of heat from the separate body to the compression mechanism side is suppressed by the rubber seal member that seals between the separate body and the compression mechanism side. In the present invention, since the seal member is also used as the heat insulating material, it is possible to avoid providing the heat insulating material, and it is possible to reduce the cost.

According to an eighth aspect of the invention, in the sixth or seventh aspect of the invention, the compressor includes a fixing member for fixing the separate structure to the compression mechanism side. Further, a heat insulating material is interposed between the separate body and the fixing member.

According to the present invention, the heat insulating material interposed between the separate component and the fixing member suppresses the transfer of heat from the separate component to the fixing member. This suppresses heat transfer from the separate structure to the compression mechanism side via the fixing member.

In the invention described in claim 9, claims 1 to 8 are provided.
In the invention described in any one of 1, the compression mechanism is of a scroll type. According to this invention, in the compressor having the scroll type compression mechanism, the effects of the invention described in any one of claims 1 to 8 can be obtained.

According to a tenth aspect of the invention, in the invention of the ninth aspect, the fixed scroll member constituting the compression mechanism is for introducing the gas discharged from the compression mechanism into the discharge chamber. Discharge holes are formed. Further, the fixed scroll member has a wall surface forming portion which constitutes a part of the inner wall surface of the discharge chamber. The wall surface forming portion is formed by a part of the wall surface of the fixed scroll member facing the discharge chamber on the discharge hole side.

According to the present invention, the heat transferred from the gas in the discharge chamber to the fixed scroll member is mainly on the discharge hole side of the wall surface of the fixed scroll member facing the discharge chamber. It is transmitted through the wall surface constituting portion constituted by the parts. That is, for example, as compared with the case where the wall surface forming portion is formed by the entire wall surface facing the discharge chamber of the fixed scroll member, the portion where the suction gas exists in the compression mechanism is less likely to be heated, so that the suction gas rises. It becomes difficult to be heated.

In the invention described in claim 11, claims 1 to
In the invention described in any one of 10 above, the compression mechanism is driven by an electric motor, and an inverter for driving the electric motor is provided integrally with the housing together with the compression mechanism.

According to the present invention, the temperature rise of the electric motor can be suppressed and the cooling effect on the inverter can be easily increased.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) An embodiment in which the compressor of the present invention is embodied in an electric compressor used in a vehicle air conditioner will be described below with reference to FIGS. 1 and 2.

As shown in FIG. 1, the housing 11 of the electric compressor is constructed by joining and fixing two housing constituents, a first housing constituent 21 and a second housing constituent 22. The first housing structure 21 is
The cylindrical portion 23 has a substantially bottomed cylindrical shape having a bottom portion 24 on the left side of the drawing, and is made of an aluminum alloy die cast casting.

On the other hand, the second housing structure 22 has a substantially cylindrical shape with a lid having a lid portion 26 on the right side of the cylindrical portion 25 in the drawing, and is made of an aluminum alloy die casting. Constituting the housing components 21, 22 with an aluminum-based metal material such as an aluminum alloy is advantageous in reducing the weight of the electric compressor as compared with a case with an iron-based metal material.

The cylindrical portion 23 of the first housing structure 21
Has a longer cylinder length than its outer diameter. On the contrary, the cylindrical portion 25 of the second housing structure 22 has a shorter cylinder length than its outer diameter. Therefore, in the housing 11, the first housing structure 21 occupies most of the outer contour as a main housing structure.

A plurality of mounting feet 27 are integrally formed on the outer peripheral surface of the cylindrical portion 23 of the first housing structure 21. An insertion hole 27a is formed through the mounting foot 27. The bolt used for attaching the electric compressor to the vehicle body is inserted into the insertion hole 27a.

As shown in FIGS. 1 and 2, the inner peripheral surface 23a of the cylindrical portion 23 in the first housing structure 21 has a gradually increasing inner diameter from the bottom 24 side toward the opening side. On the inner peripheral surface 23a of the cylindrical portion 23, the wall surface of the step located at the boundary between the small diameter area on the bottom 24 side having the smallest diameter and the intermediate diameter area adjacent thereto forms the motor positioning surface 23b (see FIG. 1). ing. On the inner peripheral surface 23a of the cylindrical portion 23, the wall surface of the step located at the boundary between the largest diameter area on the opening side having the largest diameter and the intermediate diameter area adjacent thereto forms the compression mechanism holding surface 23c. . In addition,
The inner peripheral surface 23 of the cylindrical portion 23 whose inner diameter is changed stepwise
The letter a is formed by grinding or the like after the first housing structure 21 is cast.

A plurality of mounting portions 28 are formed so as to bulge on the outer peripheral surface of the cylindrical portion 23 of the first housing structure 21 on the open end side. In each mounting portion 28, the end surface 28a on the second housing structure 22 side is the opening end surface 2 of the cylindrical portion 23.
It exists on the same plane as 3d, and both end surfaces 23d and 28a form a joint surface in the first housing structure 21. A screw hole 28b is formed in the end surface 28a of each mounting portion 28.
Has been drilled.

A plurality of mounting portions 29 are formed so as to bulge on the outer peripheral surface of the cylindrical portion 25 of the second housing structure 22 on the open end side. In each mounting portion 29, the end surface 29 a on the first housing structure 21 side is the opening end surface 2 of the cylindrical portion 25.
5a (see FIG. 2) on the same plane and both end surfaces 25
The joint surfaces of the second housing structure 22 are constituted by a and 29a. An insertion hole 29b is formed through each mounting portion 29 from the second housing structure 22 toward the first housing structure 21.

The first housing structural body 21 and the second housing structural body 22 are joined to each other at the joint surfaces 23d, 28a, 25a, 2
Bolts 30 which are joined to each other by means of 9a and are inserted through the insertion holes 29b of the second housing structure 22.
Are fastened and fixed to each other by being screwed into the screw holes 28b of the first housing structure 21. Joint surface 2 of the first housing component 21 and the second housing component 22
Gasket 31 is provided between 3d, 28a, 25a and 29a.
Is intervening. Therefore, in the housing 11, the in-housing sealed space 12 is formed by being surrounded by the first housing constituent body 21 and the second housing constituent body 22.

Joining surface 25 of the second housing assembly 22
a and 29a are joint surfaces 23 of the first housing structure 21.
inner side of d, 28a (closed space 12 in the housing)
Wide). Therefore, when the first housing component 21 and the second housing component 22 are joined, the joining surfaces 25a and 29a of the second housing component 22 are joined together.
Is the joint surfaces 23d, 28a of the first housing structure 21.
It is projected to the inner circumference side. This joint surface 25
The portions of the a and 29a protruding to the inner peripheral side are located in the housing enclosed space 12 in the first housing structure 2
It is positioned so as to face the first compression mechanism holding surface 23c and forms a compression mechanism holding surface 25b (see FIG. 2) in the second housing structure 22.

As the gasket 31, a gasket having substantially the same shape as the joint surfaces 25a and 29a of the second housing component 22 is used. Therefore, the gasket 31 also protrudes toward the inner peripheral side with respect to the joint surfaces 23d and 28a of the first housing structure 21.

As shown in FIG. 1, in the first housing structure 21, a cylindrical shaft support portion 24a is integrally provided at the center of the inner wall surface of the bottom portion 24 so as to project. In the first housing structure 21, a shaft support member 32 having an insertion hole 32a formed at its center is disposed on the opening end side of the cylindrical portion 23. The shaft support member 32 is the first housing component 2
It is fitted into the first cylindrical portion 23, and its outer peripheral portion is pushed into a position where it abuts against the compression mechanism holding surface 23c.

The rotary shaft 3 is provided in the first housing structure 21.
3 are accommodated. The end of the rotary shaft 33 on the left side of the drawing is
Through the radial bearing 34, the shaft support 24a
It is rotatably supported by. The right end of the rotary shaft 33 in the drawing is inserted into the insertion hole 32a of the shaft support member 32,
It is rotatably supported by the shaft support member 32 through the radial bearing 35 in the insertion hole 32a.

A stator 36 is arranged on the bottom 24 side in the first housing structure 21. Stator 36
Is composed of an iron core 36a having a cylindrical shape and a winding wire 36b wound around the iron core 36a. The stator 36 includes the cylindrical portion 23 of the first housing structure 21 with the iron core 36a.
The iron core 36a is press-fitted inside and is pushed to a position where the outer peripheral portion of the iron core 36a contacts the motor positioning surface 23b. A magnet 37 is fixedly arranged on the rotary shaft 33 in the first housing structure 21 so as to be located on the inner peripheral side of the stator 36.

The stator 36 and the magnet 37 constitute a motor unit 13 as an electric motor which is a brushless DC motor. The motor unit 13 integrally rotates the magnet 37 and the rotating shaft 33 by supplying power from the inverter 38 to the winding 36b of the stator 36. In the present embodiment, the inverter 38 is
It is integrally fixed to the housing 11. In FIG. 1, the inverter 38 is shown smaller than its actual size for convenience of illustration.

As shown in FIGS. 1 and 2, a scroll type compressor is used as the compression mechanism 14 of the electric compressor. That is, the fixed scroll member 41 is arranged on the opening end side of the cylindrical portion 23 in the first housing structure 21. The fixed scroll member 41 includes a cylindrical outer peripheral wall 41b on the outer peripheral side of a disk-shaped substrate 41a.
And the fixed spiral wall 41c is erected on the inner peripheral side of the outer peripheral wall 41b in the substrate 41a.

The fixed scroll member 41 has an outer peripheral wall 41b.
The end surface on the left side of the drawing is in contact with the holding surface 23c for the compression mechanism of the first housing structure 21 via the outer peripheral portion of the shaft support member 32. In the fixed scroll member 41, the end surface of the outer peripheral wall 41b on the right side in the drawing has the second housing structure 2
2 to the compression mechanism holding surface 25b, the gasket 31
Is abutted through the inner peripheral portion of the. Therefore, the fixed scroll member 41 is fixed to the compression mechanism 14 by fastening and fixing the first housing component 21 and the second housing component 22.
Together with the shaft support member 32 forming a part of the
It is clamped and fixed between 3c and 25b.

The fixed scroll member 4 on the rotating shaft 33.
An eccentric shaft 43 is provided on the end face on the first side at a position eccentric with respect to the axis of the rotary shaft 33. A bush 44 is externally fitted and fixed to the eccentric shaft 43. A movable scroll member 45 is supported by the bush 44 so as to face the fixed scroll member 41 via a bearing 46 so as to be relatively rotatable. The movable scroll member 45 includes a disk-shaped substrate 45a and a movable scroll wall 45b provided upright toward the fixed scroll member 41.

The fixed scroll member 41 and the movable scroll member 45 are meshed with each other by spiral walls 41c and 45b, and the tip surfaces of the spiral walls 41c and 45b are the base plates of the scroll members 41 and 45 of the counterpart. 41
a, 45a. Therefore, the substrate 41a and the fixed scroll wall 41c of the fixed scroll member 41, the substrate 45a and the movable scroll wall 45b of the movable scroll member 45,
The compression chamber 47 is sectioned and formed.

Between the base plate 45a of the movable scroll member 45 and the shaft support member 32 facing the base plate 45a, an annular hole 48a provided in the shaft support member 32 and an annular hole 48a projecting from the movable scroll member 45 are provided. A well-known rotation preventing mechanism 48 including a pin 48b loosely fitted in the is provided.

A suction chamber 49 is defined between the outer peripheral wall 41b of the fixed scroll member 41 and the outermost peripheral portion of the movable scroll wall 45b of the movable scroll member 45.
A suction port 50a is provided on the outer peripheral surface of the first housing structure 21.
Is integrally formed with the suction flange 50. An external pipe connected to an evaporator of an external refrigerant circuit (not shown) is connected to the suction port 50a. The suction port 50a and the suction chamber 49 are connected via a suction passage 51 formed from the suction flange 50 to the fixed scroll member 41.

On the lid portion 26 of the second housing structure 22, a cylindrical discharge chamber wall portion 60 is integrally provided so as to protrude toward the fixed scroll member 41 side. The discharge chamber wall portion 60 is formed so that a slight gap exists between the end surface of the discharge chamber wall portion 60 on the fixed scroll member 41 side and the substrate 41a of the fixed scroll member 41. On the end surface of the discharge chamber wall portion 60 on the fixed scroll member 41 side, an annular O
(O) ring receiving groove portion 61 (see FIG. 2) is formed,
A rubber O-ring 62 is housed in the O-ring housing groove 61. That is, the O-ring 62 is
The discharge chamber wall portion 60 and the fixed scroll member 41 are sealed.

A space surrounded by the lid portion 26, the discharge chamber wall portion 60, the O-ring 62 and the fixed scroll member 41 (the substrate 41a) is defined as a discharge chamber 52. A discharge hole 41e is formed in the center of the fixed scroll member 41, and the compression chamber 47 and the discharge chamber 52 on the center side are connected via the discharge hole 41e. That is, the fixed scroll member 41 includes the discharge chamber 52.
Has a wall surface forming portion 63 that forms a part of the inner wall surface of the fixed wall surface of the fixed scroll member 4.
1 (substrate 41a) is formed by a part of the wall surface facing the discharge chamber 52 on the discharge hole 41e side.

In the discharge chamber 52, the fixed scroll member 41 is provided with a discharge valve 55 composed of a reed valve for opening and closing the discharge hole 41e. The opening degree of the discharge valve 55 is regulated by a retainer 56 fixedly arranged on the fixed scroll member 41.

A discharge flange 53 having a discharge port 53a is integrally formed with the lid portion 26. An external pipe connected to a condenser of an external refrigerant circuit (not shown) is connected to the discharge port 53a. The discharge chamber 52 and the discharge port 53 a are the discharge passages 5 formed in the discharge flange 53.
4 are connected.

A coating material 64 as heat insulating means (heat insulating material) is applied to the inner wall surface of the discharge chamber 52. The coating material 64 is made of a resin having a heat insulating property, and is in a state of being in close contact with the inner wall surface of the discharge chamber 52. The coating material 64 is composed of a second housing component side coating portion 64a applied to the discharge chamber wall portion 60 and the lid portion 26, and a fixed scroll member side coating portion 64b applied to the wall surface constituting portion 63. The coating material 64 is compressed by the refrigerant gas (gas) in the discharge chamber 52 to the compression mechanism 14 side (in this case, for example, the second housing structure 22 and the substrate 41).
It is provided to suppress heating of a).

In the space surrounded by the second housing structure 22 and the fixed scroll member 41, an annular closed space 65 is defined so as to surround the discharge chamber 52. The annular closed space 65 communicates with the suction chamber 49 via a communication passage (not shown).

When the rotary shaft 33 is rotationally driven by the motor unit 13, in the compression mechanism 14, the movable scroll member 45 is fixed via the eccentric shaft 43.
Revolves around the axis of. At this time, the movable scroll member 45 is prevented from rotating by the rotation preventing mechanism 48, and only the revolution movement is permitted. By the orbital movement of the movable scroll member 45, the compression chamber 47 is moved from the outer peripheral side of the scroll walls 41c, 45b of both scroll members 41, 45 to the center side while reducing the volume thereof, so that the suction chamber 49 is compressed. The refrigerant gas taken into 47 is compressed. The compressed refrigerant gas is discharged from the discharge hole 41e to the discharge chamber 52 via the discharge valve 55, and then is discharged to the external refrigerant circuit via the discharge passage 54 and the discharge port 53a.

The above-mentioned refrigerant gas discharged into the discharge chamber 52 (discharged refrigerant gas) is in a high temperature state due to the compression, but in this configuration, the coating material 64 is provided on the inner wall surface of the discharge chamber 52. Therefore, the heat of the discharged refrigerant gas is less likely to be transferred to the fixed scroll member 41 and the second housing structure 22. That is, the fixed scroll member side coating portion 64b suppresses the heat transfer from the discharged refrigerant gas to the fixed scroll member 41 (the substrate 41a). Furthermore, the second
The heat transfer from the discharged refrigerant gas to the second housing structure 22 is suppressed by the housing structure side coating portion 64a. Due to the suppression of heat transfer to the second housing structure 22, due to the heat of the discharged refrigerant gas,
Heating of the compression mechanism 14 via the second housing structure 22 and the like is suppressed.

In this embodiment, the following effects can be obtained. (1) Inside the discharge chamber 52, the discharge chamber 52
A heat insulating means (coating material 64) is provided to prevent the compression mechanism 14 side from being heated by the refrigerant gas therein. According to this, since the heat insulating means is provided inside the discharge chamber 52, it becomes difficult for the compression mechanism 14 to be heated by the discharge refrigerant gas introduced into the discharge chamber 52. Therefore, it becomes difficult for the suction refrigerant gas to be heated in the compression mechanism 14. As a result, the reduction in volumetric efficiency of the compression mechanism 14 is suppressed.

(2) In particular, in the electric compressor of this embodiment, the housing 11 has an airtight structure. Therefore,
The compression mechanism 14 housed in the in-housing closed space 12 of the housing 11 is placed in a thermally severe environment due to a thermal casket in the in-housing closed space 12. That is, the compression mechanism 1 is housed in the housing 11 having an airtight structure.
It is particularly effective to embody the present invention in a compressor having a configuration in which 4 is accommodated.

(3) The heat insulating means is the discharge chamber 5
Applied to the inner wall surface of 2 (that is, adhered)
A coating material 64 as a heat insulating material. According to this, the heat transfer to the outside of the coating material 64 is suppressed by the coating material 64 applied to the inner wall surface of the discharge chamber 52. Therefore, heating of the compression mechanism 14 by the discharged refrigerant gas is suppressed.

(4) The fixed scroll member 41 forms a part of the inner wall surface of the discharge chamber 52 in the wall surface forming portion 63.
And the wall surface forming portion 63 includes the fixed scroll member 41.
Of the wall surface facing the discharge chamber 52 of the discharge hole 4
It is configured by a part of the 1e side. According to this
The heat transferred from the refrigerant gas in the discharge chamber 52 to the fixed scroll member 41 is transferred mainly via the wall surface forming portion 63. That is, for example, as compared with the case where the wall surface constituting portion is constituted by the entire wall surface facing the discharge chamber of the fixed scroll member, the portion where the intake refrigerant gas exists in the compression mechanism is less likely to be heated, so that the intake refrigerant gas Is hard to be heated.

(5) A gap is provided between the discharge chamber wall portion 60 and the fixed scroll member 41, and a portion between the discharge chamber wall portion 60 and the fixed scroll member 41 is made of a rubber O-ring 62. It was made to seal by. According to this, direct heat transfer from the discharge chamber wall portion 60 to the fixed scroll member 41 is prevented, and the rubber O-ring 62 allows the fixed scroll member from the discharge chamber wall portion 60 side through the O ring 62. The heat transfer to the 41 side is suppressed.

(6) In the space surrounded by the second housing structure 22 and the fixed scroll member 41, the annular closed space 65 defined so as to surround the discharge chamber 52 is sucked through the communication passage. It is in communication with the chamber 49. That is, the suction refrigerant gas is introduced into the annular closed space 65 provided closer to the suction chamber 49 than the discharge chamber 52. According to this, for example, compared with the case where the discharge refrigerant gas is introduced into a portion near the suction chamber 49 (a portion near the inner peripheral surface of the cylindrical portion 25), the suction chamber 49 is less likely to be heated.

(7) In the present embodiment, the gasket 31 interposed between the mounting portion 28 of the first housing structure 21 and the mounting portion 29 of the second housing structure 22 allows the second housing to be interposed therebetween. First from the structure 22 side
Heat transfer to the housing structure 21 side is suppressed.

(8) The compression mechanism 14 is driven by the motor unit 13 incorporated in the housing 11,
An inverter 38 for driving the motor is provided integrally with the housing 11 together with the compression mechanism 14.
According to this, the temperature rise of the motor unit 13 can be suppressed, and the cooling effect on the inverter 38 can be easily increased.

(9) The compression mechanism 14 is of scroll type. The scroll type compression mechanism 14 has advantages of small size, high efficiency, and low noise as compared with, for example, a piston type compression mechanism.

(Second Embodiment) In the second embodiment, the structure of the heat insulating means is mainly changed in the first embodiment, and in other points, the same structure as in the first embodiment. It has become. Therefore, the same components as those in the first embodiment are designated by the same reference numerals in the drawings, and duplicated description will be omitted.

As shown in FIG. 3, in the base plate 41a of the fixed scroll member 41 of the present embodiment, an annular fitting concave portion 70 is formed around the discharge hole 41e in the wall surface forming portion 63. Further, in the discharge chamber 52, the fitting recess 7
A shield member 71 made of resin as heat insulating means is fitted and fixed to 0. The shield member 71 is composed of a substantially shielded cylindrical first shield member 71a and an annular second shield member 71b fitted on the opening side thereof.

The first shield member 71a includes a cylindrical portion 71.
c and a lid portion 71d integrally formed at the right end of the cylindrical portion 71c in the drawing. First shield member 71
The opening-side end portion of a, that is, the end portion on the left side of the cylindrical portion 71c in the drawing is in contact with the inner peripheral surface side of the outer side of the fitting concave portion 70 (the outer side in the radial direction of the rotary shaft 33). Has been inserted into. A tubular portion 71e is integrally formed in the central portion of the lid portion 71d so as to project rightward in the drawing. The tip portion side of the tubular portion 71e is inserted into the discharge passage 54.

The second shield member 71b has an outer peripheral end on the inner peripheral surface of the cylindrical portion 71c, and an inner peripheral end on the fitting recess 70.
Is provided so as to come into contact with the inner peripheral surface of the inner side (the inner side in the radial direction). That is, the internal space of the shield member 71 communicates with the discharge hole 41e, and the discharged refrigerant gas introduced into the internal space through the discharge hole 41e passes through the tubular portion 71e to the discharge port 53a side. It has been derived.

The shield member 71 is provided so as to have a space between it and the inner wall surface of the discharge chamber 52. That is, there is a space between the inner wall surface of the portion of the second housing structure 22 formed by the discharge chamber wall portion 60 and the lid portion 26 and the first shield member 71a. Further, a space is provided between the second shield member 71b and the surface of the fitting recess 70 facing the right side of the drawing.

In this embodiment, the following effects can be obtained in addition to the effects similar to the above (1), (2) and (4) to (9). (10) The shield member 71 provided so as to have a space between it and the inner wall surface of the discharge chamber 52 prevents direct blowing of the refrigerant gas introduced into the discharge chamber 52 onto the inner wall surface. Thereby, the heat of the refrigerant gas is prevented from being directly transferred to the inner wall surface, so that the temperature rise of the wall portion forming the inner wall surface of the discharge chamber 52 is suppressed and the wall portion is prevented. The heating of the compression mechanism 14 due to the heat is suppressed.

(11) In this embodiment, the shield member 71 fitted and fixed in the discharge chamber 52 suppresses the heating of the compression mechanism 14 by the refrigerant gas introduced into the discharge chamber 52. That is, in this embodiment, the discharge chamber 52 can be assembled by fitting the heat insulating means to the housing 11.

(Third Embodiment) In the third embodiment, the configuration of the second housing structure 22 is mainly changed in the first embodiment, and in other respects, the first embodiment is used. It has the same configuration as the form. Therefore, the first
Constituent parts common to those of the above embodiment are designated by the same reference numerals in the drawings, and redundant description will be omitted.

As shown in FIG. 4, the second housing structural body 22 of the present embodiment includes an inner housing member 22a as a separate structural body having a wall portion forming the inner wall surface of the discharge chamber 52, and the inner housing member 22a. An outer housing member 22b as a fixing member is provided outside the member 22a (outside in the radial direction of the rotating shaft 33). The inner housing member 22a and the fixed scroll member 41 (the wall surface forming portion 63) form a wall portion of the discharge chamber 52.

The inner housing member 22a has a substantially cylindrical shape with a lid, and the lid portion 26 in the first embodiment.
26a corresponding to a part of the center side of the lid, and the lid 26a
The discharge chamber wall portion 60 is integrally formed with the discharge chamber wall portion 60. The lid 26a has a discharge flange 53 similar to that described above.
Is provided. On the outer peripheral portion of the lid portion 26a, a first step portion 22c on which a resin ring 80, which will be described later, is mounted, and a second step portion 22d formed on the left side of the drawing are provided. The O-ring receiving groove portion 61 formed in the discharge chamber wall portion 60 has an O-ring as a heat insulating material (a rubber sealing member).
A ring 62 is housed.

The outer housing member 22b has a lid portion 26b corresponding to a part of the outer peripheral side of the lid portion 26, and the lid portion 2
6b, a cylindrical portion 25 formed integrally with the 6b, and the cylindrical portion 2
5 and the attachment part 29 formed integrally.
A first step portion 22e and a second step portion 22f are provided on the inner peripheral portion of the lid portion 26b at locations corresponding to the first step portion 22c and the second step portion 22d, respectively.

An annular resin ring 80 is interposed between the first step portion 22c and the first step portion 22e. Thereby, the inner housing member 22a and the outer housing member 2
It does not come into direct contact with 2b. Also,
The portion between the second step portion 22d and the second step portion 22f is O
It is sealed by an (O) ring 81. The inner housing member 22a is fixed to the first housing structure 21 side via the outer housing member 22b, the resin ring 80, the O-ring 81, and the like. In the present embodiment, the resin ring 80 and the O ring 81
A heat insulating material interposed between the separate structure and the fixing member is configured.

An annular groove portion 82 is formed in the wall surface forming portion 63 near the discharge chamber wall portion 60.
As a result, the substrate 41a of the fixed scroll member 41
Has a smaller plate thickness at a portion corresponding to the groove portion 82.

In this embodiment, the above (2) and (4)
In addition to the effects similar to (9), the following effects can be obtained. (12) Since the inner housing member 22a configured separately from the compression mechanism 14 side is joined to the compression mechanism 14 side via the heat insulating material (O ring 62), the inner housing member 22a is The heat transferred from the refrigerant gas in the discharge chamber 52 becomes difficult to transfer to the compression mechanism 14 side. Therefore, it becomes difficult for the intake refrigerant gas in the compression mechanism 14 to be heated. As a result, the reduction in volumetric efficiency of the compression mechanism 14 is suppressed.

(13) A rubber seal member (O) for sealing between the inner housing member 22a and the compression mechanism 14 side.
The ring 62) suppresses heat transfer from the inner housing member 22a to the compression mechanism 14 side. In this configuration, the seal member is also used as the heat insulating material, so that it is possible to avoid providing the heat insulating material, and it is possible to reduce the cost.

(14) The inner housing member 22a is
It is fixed to the compression mechanism 14 side by an outer housing member 22b which is separately provided. Further, the heat insulating material (80, 81) interposed between the inner housing member 22a and the outer housing member 22b suppresses heat transfer from the inner housing member 22a to the outer housing member 22b. Thereby, heat transfer from the inner housing member 22a to the compression mechanism 14 side via the outer housing member 22b is suppressed.

(15) The board 41a of the fixed scroll member 41 has a small plate thickness at a portion corresponding to the groove portion 82. Thereby, heat conduction from the discharge chamber 52 side (inside the groove portion 82 in the wall surface forming portion 63) to the suction chamber 49 side via the substrate 41a is suppressed.

The embodiment is not limited to the above, but may have the following modes, for example. The suction refrigerant gas may be more positively used in order to effectively cool the inverter integrally provided in the housing of the electric compressor. In this case, for example, the configuration is as shown in FIG.
In this configuration, the suction flange 50 in which the suction port 50a is formed is provided closer to the motor section (13) than in the above embodiment. That is, the suction flange 50 is provided farther from the discharge chamber 52. Also in this case, as in the case of the above-described embodiment, the suction port 50a is a space (motor chamber) in which the motor section (13) is arranged in the housing enclosed space (12).
It is directly communicated with the suction chamber (49) through the suction passage 51 without passing through the above. In this configuration as well, the suction port 50a is arranged so as to open upward in the drawing in the suction flange 50, as in the above embodiment. That is, the portion of the suction passage 51 on the suction port 50a side is arranged closer to the motor unit 13 than in the above embodiment. In this configuration, the inverter 38 is provided integrally with the housing 11 in a state of being arranged so as to overlap the suction flange 50 in the left-right direction of the drawing, that is, in the vicinity of the suction flange 50. According to this configuration, the heat generated by the inverter 38 is radiated to the atmosphere outside the housing 11 and is also transmitted to the housing 11. At this time, the portion of the housing 11 where the inverter 38 is provided is effectively cooled by the suction refrigerant gas passing through the suction passage 51. Further, in this configuration, the heat of the discharge chamber 52 side is less likely to be transferred to the compression mechanism 14 side, that is, the suction flange 50 side due to the heat insulating means and the like in the above-described embodiment. Therefore, the temperature of the housing 11 in the portion where the inverter 38 is provided is unlikely to rise, and the cooling effect on the inverter 38 can be maintained high. As a result,
In the inverter 38, the operating state under high load where the amount of heat generated is large becomes more stable, and the reliability is improved.

In the above embodiment, for example, the wall surface constituting portion 63 may be formed by the entire surface of the wall surface of the fixed scroll member 41 that faces the discharge chamber 52 of the substrate 41a. That is, the entire wall surface may form the inner wall surface of the discharge chamber 52. However, in order to effectively suppress the temperature rise of the suctioned refrigerant gas, it is preferable that the wall surface constituting portion 63 has an area of about half the entire surface of the wall surface.

In the first embodiment, the coating material 64 may be made of rubber or the like. In the first, second and third embodiments, the refrigerant gas may not be introduced into the annular closed space 65. In this configuration, when the inside of the annular closed space 65 is in a substantially atmospheric pressure state, the first housing component 21 and the second housing component 22 may be joined without interposing the gasket 31. When the first housing component 21 and the second housing component 22 are joined without the gasket 31 interposed, the outer peripheral surface of the fixed scroll member 41 and the first housing component 21 facing the outer peripheral surface thereof. It is more preferable to provide a sealing material that seals between the inner peripheral surface and the inner peripheral surface.

In the second embodiment, the space between the shield member 71 and the inner wall surface of the discharge chamber 52 and the internal space of the shield member 71 are the first shield member 71.
They may be communicated with each other via a joint between a and the second shield member 71b. In this case, any structure may be used as long as the direct spraying of the discharge refrigerant gas from the discharge hole 41e side to the inner wall surface can be suppressed.

In the second embodiment, the shield member 71 may be fixed to the housing 11 side (including the compression mechanism 14) via a heat insulating material. In the second embodiment, the resin forming the shield member 71 may or may not have a heat insulating property.

○ In the second embodiment, the shield member 7
Although 1 is made of resin, it is not limited to this. For example, metal, ceramic, elastomer other than resin, or the like may be used.

In the second embodiment, when the shield member 71 is made of a heat insulating material, a space is not formed between the inner wall surface of the discharge chamber 52 and the shield member 71. That is, the two may be in close contact with each other. In this case, the heat-shielding shield member 71 suppresses the heat of the refrigerant gas inside the shield member 71 from being transferred to the outside. However, in this configuration, the inside and the outside of the shield member 71 (the discharge chamber 52
It is desirable that the inner wall surface side of) is not communicated.

In the third embodiment, the groove portion 82 may not be provided. ○ In the third embodiment, the inner housing member 22
The a may be in direct contact with the outer housing member 22b without the resin ring 80. In this case, a gasket 31 that can function as a heat insulating material is provided between the outer housing member 22b and the first housing structure 21.
It is desirable that members such as

In the third embodiment, the inner housing member 22a may be fixed to the first housing structure 21 side without the outer housing member 22b. In this case, a heat insulating material may be interposed between the inner housing member 22a and the first housing structure 21 side.

In the above embodiment, a heat insulating material may be interposed between the discharge chamber wall portion 60 and the fixed scroll member 41. For example, even when the O-ring 62 is configured to function as a heat insulating material, a heat insulating material other than this may be interposed in addition to the O ring 62.

In the above embodiment, the inverter 3
8 may not be integrally provided with the housing 11. The present invention is not limited to being embodied in an electric compressor incorporating an electric motor, but may be embodied in a compressor of a type driven by an engine that is a traveling drive source of a vehicle, for example.

The compression mechanism is not limited to the scroll type, and any type such as a piston type, a vane type or a helical type may be adopted.

The present invention is not limited to being embodied in a compressor used in a vehicle air conditioner,
For example, it may be embodied in a compressor used in a home air conditioner.

The present invention is not limited to being embodied in a compressor used in an air conditioner, but is also embodied in a refrigeration cycle other than an air conditioner, that is, a compressor used in a refrigeration cycle of a refrigerator or a freezer, for example. May be turned into.

The present invention is not limited to being embodied in a compressor used in a refrigeration cycle, but may be embodied in an air compressor used in, for example, an air suspension device of a vehicle.

[0093]

As described in detail above, according to the invention described in claims 1 to 11, the temperature rise of the intake gas in the compression mechanism of the compressor is suppressed, and the volumetric efficiency of the compression mechanism is suppressed from decreasing. can do.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an outline of an electric compressor according to a first embodiment.

FIG. 2 is a schematic partial enlarged sectional view showing the vicinity of the discharge chamber.

FIG. 3 is a schematic partial enlarged cross-sectional view showing the vicinity of the discharge chamber of the second embodiment.

FIG. 4 is a schematic partial enlarged cross-sectional view showing the vicinity of a discharge chamber according to a third embodiment.

FIG. 5 is a schematic diagram showing an electric compressor of another example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 ... Housing, 13 ... Motor part as an electric motor, 14 ... Compression mechanism, 22a ... Inner housing member as a separate structure, 22b ... Outer housing member as a fixing member, 38 ... Inverter, 41 ... Fixed scroll member, 41e ... Discharge hole, 52 ... Discharge chamber, 62 ... O-ring as heat insulating material, 63 ... Wall surface forming portion, 64 ... Coating material as heat insulating means, 71 ... Shield member as heat insulating means, 80 ... Resin as heat insulating material Ring, 81 ...
O-ring as a heat insulating material.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroyuki Motonami             2-1, Toyota-cho, Kariya City, Aichi Stock Association             Inside Toyota Toyota Industries (72) Inventor Kazuhiro Kuroki             2-1, Toyota-cho, Kariya City, Aichi Stock Association             Inside Toyota Toyota Industries (72) Inventor Yoshikazu Fukuya             2-1, Toyota-cho, Kariya City, Aichi Stock Association             Inside Toyota Toyota Industries (72) Inventor Satoshi Nagakawa             2-1, Toyota-cho, Kariya City, Aichi Stock Association             Inside Toyota Toyota Industries F-term (reference) 3H003 AA05 AB01 AC03 AD01 AD02                       BF04                 3H029 AA02 AA15 AB03 BB14 BB43                       CC09 CC25 CC46                 3H039 AA02 AA06 AA12 BB14 BB28                       CC29 CC33 CC36

Claims (11)

[Claims] 1. A compressor provided with a discharge chamber into which gas discharged from the compression mechanism is introduced while performing gas compression by an operation of a compression mechanism housed in a housing, wherein the discharge chamber is provided inside the discharge chamber. A compressor provided with heat insulating means for suppressing heating of the compression mechanism side by the gas in the discharge chamber. 2. The compressor according to claim 1, wherein the heat insulating means is a heat insulating material that is in close contact with an inner wall surface of the discharge chamber. 3. The compressor according to claim 2, wherein the heat insulating material is a coating material applied to the inner wall surface. 4. The compressor according to claim 1, wherein the heat insulating means is a shield member provided so as to have a space between the heat insulating means and the inner wall surface of the discharge chamber. 5. The compressor according to claim 2, wherein the heat insulating unit is fitted and fixed in the discharge chamber. 6. A compressor provided with a discharge chamber into which gas discharged from the compression mechanism is introduced while performing gas compression by the operation of a compression mechanism housed in the housing, the discharge chamber being configured. At least a part of the wall
A compressor characterized in that a separate body structure is formed separately from the compression mechanism side, and the separate body structure is joined to the compression mechanism side via a heat insulating material. 7. The compressor according to claim 6, wherein the heat insulating material is a rubber sealing member. 8. The fixing member for fixing the separate structure to the compression mechanism side, and a heat insulating material interposed between the separate structure and the fixing member.
Or the compressor according to 7. 9. The compressor according to claim 1, wherein the compression mechanism is a scroll type. 10. The fixed scroll member constituting the compression mechanism is formed with a discharge hole for introducing the gas discharged from the compression mechanism into the discharge chamber, and the fixed scroll member is configured to discharge the gas. A wall surface constituting part which constitutes a part of the inner wall surface of the chamber, wherein the wall surface constituting part is constituted by a part of the wall surface of the fixed scroll member facing the discharge chamber on the discharge hole side. The compressor according to claim 9, wherein: 11. The compression mechanism is driven by an electric motor, and an inverter for driving the electric motor comprises:
The compressor according to claim 1, wherein the compressor is provided integrally with the housing together with the compression mechanism.