JP2007064053A - Electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric compressor with excellent reliability and durability, in which ease of assembly of a stator to a compressor housing is improved to improve ease of assembly of a whole electric compressor. <P>SOLUTION: In the electric compressor, the stator of an electric motor of a compression mechanism is inserted into a compressor housing, and the electric motor is incorporated in the compressor housing at a predetermined position. At least one resin body is interposed between an outer surface of the stator of the electric motor and an inner wall of the compressor housing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric compressor in which a motor is built in a compressor housing, and more particularly to an electric compressor including a hybrid compressor suitable for a vehicle refrigeration system and the like.

  2. Description of the Related Art Conventionally, an electric compressor incorporating an electric motor for driving a compression mechanism is well known, and the electric compressor includes a hybrid compressor which is often used in a refrigeration system of a vehicle in recent years. In such a compressor, the electric motor is housed in the compressor housing of the compressor. In FIG. 4, reference numeral 100 denotes a compressor housing. An electric motor 102 that drives a compression mechanism 101 (for example, a scroll type compression mechanism) is built in the compressor housing 100. The electric motor 102 includes a stator 103 and a rotor (rotor) 104, and the rotor 104 rotates integrally with the drive shaft 105. One end of the drive shaft 105 is supported by a bearing 107 fixed to the compressor housing 100. On the other hand, the other end of the shaft 105 is supported by a bearing 109 fixed to the compression mechanism 101 (movable scroll or the like). In such a compressor, the compression mechanism 101 coupled to the drive shaft 105 is driven by the rotational drive of the electric motor 102 to compress fluid (for example, refrigerant).

  In the compressor as described above, the electric motor 102 is fixed at a predetermined position in the compressor housing 100 by press-fitting the stator 103 into the compressor housing 100.

However, in the electric compressor as described above, the stator 103 and the compressor housing 100 are heated as the electric motor 102 is driven. For this reason, when the materials of the compressor housing 100 (for example, aluminum) and the stator 103 (for example, iron) are different, the inner wall of the compressor housing 100 and the outer surface of the stator 103 are at a high temperature due to the difference in linear expansion coefficient between the two. There is a possibility that a gap is formed between the two. If the dimensions of the outer diameter of the stator 103 and the inner diameter of the compressor housing are set so that the gap is not formed even at a high temperature so as to solve such a problem, the press-fit workability may be significantly reduced. Further, in the configuration in which the metal stator is press-fitted into the metal compressor housing as described above, it is necessary to strictly manage the processing dimensions of the stator and the compressor housing, so that the workability of manufacturing the electric compressor is reduced. There is also a risk.
JP 2004-176560 A

  Accordingly, an object of the present invention is to provide an electric compressor that can improve the workability of assembling the stator to the compressor housing, and consequently the workability of the whole electric compressor, and is excellent in reliability and durability. .

  In order to solve the above-described problems, an electric compressor according to the present invention has a stator of an electric motor for driving a compression mechanism inserted in a compressor housing, and the electric motor is built in a predetermined position in the compressor housing. In the electric compressor, one or more resin bodies are interposed between the outer surface of the stator of the electric motor and the inner wall of the compressor housing. In such a configuration, even if the processing dimensions of the stator and the compressor housing are not strictly controlled, some dimensional errors are absorbed by the elastic deformation of the resin body, so that when the stator is inserted into the compressor housing, Assembly workability can be improved. Further, even when the temperature and the stator and the compressor housing expand and contract and the dimensions of both expand and contract, the change in the dimensions is absorbed by the expansion and contraction of the interposed resin body. The position and posture of the electric motor can be kept constant at all times. Therefore, the reliability and durability of the apparatus can be improved while improving the assembly and manufacturing workability of the apparatus.

  The shape of the resin is not particularly limited, but can be formed into, for example, a strip. The resin body can also be provided integrally with the stator. For example, if a groove portion into which the resin body is fitted is formed in the stator, the resin body can be easily and integrally installed on the stator.

  The electric motor can be fixed at a predetermined position in the compressor housing by press-fitting the stator of the electric motor into the compressor housing.

  The resin body can extend in the circumferential direction of the stator or the axial direction of the stator. In an aspect in which the resin body extends in the circumferential direction of the stator, it may be provided on the entire circumference of the stator or may be partially disposed. In addition, it is preferable to install the resin body in such a manner that the resin body always exists on the outer surface rotated 180 degrees with respect to the circumferential direction of the stator from the installation portion of one resin body.

  Moreover, it is preferable that the linear expansion coefficient of the said resin body is larger than the linear expansion coefficient of a compressor housing. In such a configuration, even if the temperature varies in the configuration in which the stator is press-fitted into the compressor housing, the stator is reliably held on the inner wall of the compressor housing.

  Although the said resin body is not specifically limited, It can comprise from a polyamide-type resin (for example, nylon) etc.

  The structure of the electric motor according to the present invention can be applied to any type of electric compressor as long as the electric compressor has a built-in electric motor, and can also be applied to a so-called hybrid compressor. For example, a first compression mechanism in which an electric compressor is driven only by a first drive source different from the built-in electric motor, and a second compression mechanism driven only by the built-in electric motor as a second drive source The present invention can also be applied to the case where the compressors are composed of hybrid compressors that are arranged side by side and assembled together.

  In such a hybrid compressor, for example, a configuration in which the first compression mechanism and the second compression mechanism are scroll-type compression mechanisms and the fixed scrolls of both compression mechanisms are arranged back to back can be employed. The two fixed scrolls arranged back to back can also be formed of a fixed scroll member integrally formed. As the first drive source, a motor for a vehicle, for example, an engine for driving a vehicle, or an electric motor different from the built-in electric motor can be used.

  According to the electric compressor according to the present invention, even if the processing dimensions of the stator and the compressor housing are not strictly controlled, some dimensional errors are absorbed by the elastic deformation of the resin body. Assembling workability when inserting into the machine housing can be improved. Further, even when the temperature and the stator and the compressor housing expand and contract and the dimensions of both of them change, the position and posture of the electric motor in the compressor housing can always be kept constant. Therefore, the reliability and durability of the apparatus can be improved while improving the assembly and manufacturing workability of the apparatus.

Hereinafter, preferred embodiments of an electric compressor according to the present invention will be described with reference to the drawings.
FIG. 1 shows an electric compressor according to an embodiment of the present invention, and particularly shows a case where the present invention is applied to a hybrid compressor. FIG. 2 shows the structure of the built-in electric motor of the hybrid compressor shown in FIG. 1. The structure shown in FIG. 2 is not limited to the hybrid compressor, and only the built-in electric motor is used as the drive source. It is a structure applicable also to the electric compressor which has as.

  First, the hybrid compressor shown in FIG. 1 will be described. The hybrid compressor 1 is a scroll compressor, and includes a first compression mechanism 2 and a second compression mechanism 3. The first compression mechanism 2 includes a fixed scroll 10, a movable scroll 11 that meshes with the fixed scroll 10 to form a plurality of pairs of working spaces (fluid pockets) 12, engages with the movable scroll 11, and moves the movable scroll 11. And an electromagnetic clutch 15 that turns on / off driving force transmission between the driving shaft 13 and the pulley 14 to which driving force is transmitted from a vehicle driving prime mover (not shown) as a first driving source. And a ball coupling 16 that prevents the movable scroll 11 from rotating, and a suction port 18 formed in the compressor housing 17. The compressed fluid (for example, refrigerant gas) sucked into the suction chamber 20 from the suction port 18 through the suction passage 19 is taken into the working space 12, and the working space 12 decreases in volume to the center of the fixed scroll 10. The refrigerant gas in the working space 12 is compressed by being moved toward. A discharge hole 21 is formed at the center of the fixed scroll 10, and the compressed refrigerant gas flows out to the high pressure side of the external refrigerant circuit through the discharge hole 21, the discharge passage 22 and the discharge port 23.

  On the other hand, the second compression mechanism 3 includes a fixed scroll 30, a movable scroll 31 that meshes with the fixed scroll 30 to form a plurality of working spaces (fluid pockets) 32, and engages with the movable scroll 31 to move the movable scroll 31. A drive shaft 33 that rotates is provided, and a ball coupling 34 that prevents the movable scroll 31 from rotating. In order to drive the drive shaft 33 of the second compression mechanism 3, an electric motor 35 as described later is incorporated. In the second compression mechanism 3, the fluid to be compressed (for example, refrigerant gas) sucked into the suction chamber 20 of the first compression mechanism 2 from the suction port 18 by the drive of the electric motor 35 passes through the communication path 39 to the second. The refrigerant gas in the working space 32 is sucked into the suction chamber 40 of the compression mechanism 3 and taken into the working space 32, and the working space 32 is moved toward the center of the fixed scroll 30 while reducing the volume. Compressed. A discharge hole 41 is formed in the central portion of the fixed scroll 30, and the compressed refrigerant gas flows out to the high pressure side of the external refrigerant circuit via the discharge hole 41 and the discharge passage 42.

  In this embodiment, the fixed scroll 10 of the first compression mechanism 2 and the fixed scroll 30 of the second compression mechanism 3 are disposed back to back, and the fixed scroll members 10 and 30 are integrated with each other. 43 is formed.

  When only the first compression mechanism 2 of the hybrid compressor 1 is operated, no electric power is supplied to the electric motor 35 that drives the second compression mechanism 3, and the electric motor 35 does not rotate. Accordingly, the second compression mechanism 3 does not operate. When the hybrid compressor 1 is driven only by the electric motor 35, the electric motor 35 is turned on and rotates, and the rotation of the electric motor 35 is transmitted to the drive shaft 33 of the second compression mechanism 3. The movable scroll 31 is driven to turn. At this time, the electromagnetic clutch 15 of the first compression mechanism 2 is not energized, and the rotation of the vehicle prime mover as the first drive source is not transmitted to the first compression mechanism 2. Accordingly, the first compression mechanism 2 does not operate. When both the compression mechanisms 2 and 3 are driven simultaneously, the driving force from the vehicle prime mover is transmitted to the movable scroll 11 of the first compression mechanism 2 and the electric motor 35 is turned on so that the driving force is the first. 2 is transmitted to the movable scroll 31 of the compression mechanism 3.

  In the hybrid compressor 1 configured as described above, the terminal portion 50 of the electric motor 35 is disposed on the upper portion of the hybrid compressor 1 in the mounting form. The terminal portion 50 has a connection portion 53 between the external power supply terminal 51 of the electric motor 35 and the end of the wire 52 from the stator 37 of the electric motor 35. The connecting portion 53 is disposed in a hollow projecting portion 54 formed on the stator housing 38 and extending outward. The power supply external terminal 51 has a lid 55 that can substantially seal the hollow projecting portion 54. It is attached.

  The electric motor 35 has a rotor (rotor) 36 fixed to the drive shaft 33 and a stator 37, and the stator 37 is fixed to a stator housing 38 formed as a part of the compressor housing 17. In addition, the entire electric motor 35 is accommodated in the stator housing 38. In this embodiment, the electric motor 35 is fixed at a predetermined position of the housing 38 by press-fitting the stator 37 into the stator housing 38.

  One end of the drive shaft 33 of the electric motor 35 is supported by a bearing 56 fixed to the movable scroll 31. On the other hand, the other end of the drive shaft 33 is supported by a bearing 57 fixed to the stator housing 38.

  Resin bodies 61 and 62 extending in the circumferential direction of the stator 37 are provided on the outer surface 58 of the stator 37 of the electric motor 35. In the present embodiment, the resin bodies 61 and 62 are provided on the entire circumference of the outer surface 58 of the stator 37. Specifically, grooves 59 and 60 are extended in the circumferential direction of the stator 37, and resin bodies 61 and 62 are fitted into the grooves 59 and 60, and are provided integrally with the stator 37. In the present embodiment, the resin bodies 61 and 62 are formed in a band shape. As shown in FIG. 3, grooves 59, 60 may be extended in the axial direction of the stator 37, and resin bodies 61, 62 may be fitted into the grooves 59, 60.

  The resin bodies 61 and 62 are not particularly limited, but in the present embodiment, a polyamide-based resin (for example, nylon) larger than the linear expansion coefficient of the stator housing 38 made of aluminum is used.

  In this embodiment, even if the processing dimensions of the stator 37 and the stator housing 38 are not strictly controlled, some dimensional errors are absorbed by the elastic deformation of the resin bodies 61 and 62, so that the stator 37 is attached to the stator housing 38. Assembly workability at the time of insertion can be improved. Further, even when the temperature changes and the stator 37 and the stator housing 38 expand and contract and the dimensions of both of them change, the change in the dimensions is absorbed by the expansion and contraction of the interposed resin bodies 61 and 62. The position and posture of the electric motor 35 in the stator housing 38 can always be kept constant. Therefore, the reliability and durability of the apparatus can be improved while improving the assembly and manufacturing workability of the apparatus.

  In this embodiment, as shown in FIG. 2, two resin bodies 61 and 62 are provided in the axial direction of the stator 37. In addition, since the resin body always exists on the outer surface rotated 180 degrees from the resin body installation portion with respect to the circumferential direction of the stator, the electric motor 35 in the stator housing 38 with respect to temperature change is adopted. The position and orientation can be reliably kept constant, and the assembly and manufacturing workability of the apparatus can be improved.

  Further, since the linear expansion coefficients of the resin bodies 61 and 62 are set to be larger than the linear expansion coefficient of the stator housing 38, the stator 37 is securely held against the inner wall of the stator housing 38 even if the temperature changes. Will be.

  The present invention is applicable to any electric compressor having a built-in electric motor for driving a compression mechanism, and in particular, includes a built-in electric motor and a hybrid compressor capable of driving each compression mechanism by a drive source different from that. It can also be applied to an electric compressor.

It is a longitudinal section of a hybrid compressor as an electric compressor concerning one embodiment of the present invention. FIG. 2 is an enlarged longitudinal sectional view of an electric motor of the hybrid compressor in FIG. 1. FIG. 3 is an enlarged longitudinal sectional view of an electric motor according to a mode different from FIG. 2. It is an expansion longitudinal cross-sectional view of the electric motor of the conventional compressor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hybrid compressor as electric compressor 2 1st compression mechanism 3 2nd compression mechanism 10, 30 Fixed scroll 11, 31 Movable scroll 12, 32 Working space 13, 33 Drive shaft 14 Pulley 15 Electromagnetic clutch 16 Ball coupling 17 Compression Machine housing 18 Suction port 19 Suction passage 20, 40 Suction chamber 21, 41 Discharge hole 22, 42 Discharge passage 23 Discharge port 34 Ball coupling 35 Electric motor 36 Rotor (rotor)
37 Stator 38 Stator housing 39 Communication path 43 Fixed scroll member 50 Terminal portion 51 External terminal for power supply 52 Wire from stator 53 Connection portion 54 Hollow projecting portion 55 Lid 56, 57 Bearing 58 Outer surface 59, 60 Groove 61, 62 Resin body

Claims (11)

  In an electric compressor in which a stator of an electric motor for driving a compression mechanism is inserted into a compressor housing, and the electric motor is built in a predetermined position in the compressor housing, an outer surface of the stator of the electric motor and the compressor An electric compressor comprising one or more resin bodies interposed between an inner wall of a housing.   The electric compressor according to claim 1, wherein the resin body is a belt-like body.   The electric motor according to claim 1, wherein the resin body is provided integrally with the stator.   The electric compressor according to claim 1, wherein the stator is press-fitted in a compressor housing.   The electric compressor according to claim 1, wherein the resin body extends in a circumferential direction of the stator.   The electric compressor according to claim 1, wherein the resin body extends in an axial direction of the stator.   The electric compressor according to claim 1, wherein a linear expansion coefficient of the resin body is larger than a linear expansion coefficient of the compressor housing.   The electric compressor according to claim 1, wherein the resin body is made of a polyamide-based resin.   A first compression mechanism that is driven only by a first drive source that is different from the electric compressor or the built-in electric motor, and a second compression mechanism that is driven only by the built-in electric motor as a second drive source. The electric compressor according to any one of claims 1 to 8, comprising a hybrid compressor arranged side by side and assembled integrally.   The electric compressor according to claim 8, wherein the first compression mechanism and the second compression mechanism are scroll compressors, and fixed scrolls of both compression mechanisms are arranged back to back. The electric compressor according to claim 9 or 10, wherein the first drive source comprises a vehicle prime mover.

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