JP5053523B2 - Electric compressor - Google Patents

Description

  The present invention relates to an electric compressor incorporating an electric motor for driving a compression mechanism, and more particularly to a structure for improving vibration resistance of a motor terminal connection portion in an electric compressor including a hybrid compressor suitable for a vehicle refrigeration system or the like.

  In an electric compressor having a built-in electric motor for driving a compression mechanism, particularly an electric compressor used in a refrigeration system for a vehicle or the like, a high voltage motor is usually used. The connection portion, the motor housing portion, and the compressor housing portion (that is, the body portion) are insulated from each other, and a structure without fear of electric leakage is required. Such an electric compressor is usually provided with a connecting portion between an external terminal for power feeding to a built-in electric motor and an end portion of a wire from the stator of the electric motor, and the connecting portion is provided in the compressor housing. In particular, a structure that is housed in a hollow protrusion that extends outward is often employed.

  In addition, even in an electric compressor used in a vehicle refrigeration system using a high voltage motor, the connection portion is often designed in the same manner as a general home appliance compressor, and is connected to a terminal. The part is held only by the spring force attached to the terminal, and there is often no particular anti-vibration measure. For example, it is often the case that a terminal and a coupler for a general home appliance compressor are used, and the terminal connecting portion is only pressed by a spring force, and is not fixed by a fixing means such as a bolt. Therefore, when a large load exceeding the spring force is applied, the terminal connection portion may be disconnected or a momentary disconnection (a phenomenon in which the electrical connection is instantaneously disconnected and instantaneously disconnected) may occur. Such a problem is likely to occur particularly in an electric compressor mounted on a vehicle to which an external force due to vibration is easily applied. However, since such a structure is a simple structure, productivity and cost are good.

  On the other hand, as a structure for improving the vibration resistance of the motor terminal connection portion, for example, as shown in FIG. 4, around the connection portion between the terminals of the power supply external terminal 101 and the terminal of the wire end portion 102 from the stator. Also, a structure in which a resin 103 such as epoxy is injected and a connection portion is cast is also known. The resin 103 insulates the compressor housing 104 from the terminals. In this structure, the periphery of the terminal is cast with resin, so the possibility of cutting by vibration is reduced. However, the terminal (metal) and the resin have different linear expansion coefficients, so the direction of cutting the terminal depends on the ambient temperature. There is a possibility of deformation. In addition, the cost is low because the structure is simple, but the productivity is poor because it takes time to cure the resin on the production line.

  The problem with such a connection is that not only a simple electric compressor with a built-in electric motor for driving the compression mechanism, but also a built-in electric motor and another external drive source (for example, a vehicle travel engine). The same applies to a hybrid compressor used as a drive source for a compression mechanism.

For example, as a hybrid compressor used in a vehicle refrigeration system or the like, a scroll type first compression mechanism driven only by a vehicle prime mover and a scroll type second compression mechanism driven only by a built-in electric motor, A hybrid compressor in which fixed scrolls of both compression mechanisms are integrated back to back has been proposed (Patent Document 1). With such a hybrid compressor, it becomes possible to operate each compression mechanism independently or simultaneously, and it is possible to obtain optimum discharge performance according to the request at that time. Even in such a hybrid compressor, the above-described problems exist in the terminal connection portion for the built-in electric motor.
JP 2003-161257 A

  Therefore, the object of the present invention is to improve the vibration resistance of the motor terminal connection part and prevent the terminal connection part from being disconnected or momentarily interrupted while ensuring good productivity in the electric compressor incorporating the electric motor. The object is to provide a possible electric compressor.

In order to solve the above problems, an electric compressor according to the present invention incorporates an electric motor for driving a compression mechanism, and connects an external terminal for power feeding to the electric motor and an end of a wire from a stator of the electric motor. In the electric compressor in which the part is accommodated in the compressor housing, at least one of disconnection due to vibration, electrical disconnection, and damage to the insulating member in the connection part and / or around the connection part is mechanically And the connection portion is formed via a tab housing that holds the power supply external terminal and a receptacle housing that holds the wire end portion of the stator. as a means, at least equipped with a vibration means interposed between the tub housing and the receptacle housing, as the vibration proof means, the Tabuhaujin Consisting of those, characterized in that it comprises a pressing resilient member towards the compressor housing.

  As the structure of the connecting portion, for example, through a coupler structure including a tab housing that holds the power supply external terminal, and a receptacle housing that holds the wire end portion of the stator and is fitted to the tab housing. Can be adopted.

  And as said vibration proof means, the following various structures can be taken. For example, a structure including an O-ring interposed between the tab housing and the receptacle housing can be employed.

  Further, as the vibration proof means, a structure including an elastic body interposed between the outer end portion or the inner end portion of the tab housing and the inner end portion or the outer end portion of the receptacle housing can be adopted. . As the elastic body, for example, a rubber member that can be compressed and deformed in the longitudinal direction and expandable in the radial direction can be used.

  Further, as the vibration proof means, a structure provided with a lock mechanism provided between the tab housing and the receptacle housing and locking the two housings to each other can be adopted.

Further, as the vibration proof means, a structure including an elastic member capable of pressing the tab housing toward the compressor housing is adopted . As this elastic member, for example, a wave washer can be used. Further, it is possible to adopt a structure in which a flat washer is interposed between the wave washer and the tab housing.

  Further, as the vibration-proof means, a structure including an O-ring interposed between the tab housing and the compressor housing can be adopted.

  Further, as the vibration proof means, a structure provided with wire holding means provided on the receptacle housing side and elastically holding the wire from the stator can be adopted. This wire holding means can be comprised from a rubber member, for example. In addition, the wire holding means may be configured by a holding member (for example, a pressing plate described later) attached to the receptacle housing, or without such a holding member, It is also possible to constitute the wire directly attached to the wire by caulking or the like and held in the receptacle housing.

  The connecting portion may be formed in a hollow projecting portion that is formed in a housing that houses the electric motor and to which the stator is fixed and extends outward. This hollow protrusion can be configured to be substantially sealed with respect to the outside of the compressor.

  The structure for improving vibration resistance of the terminal connecting portion according to the present invention can be applied to any type of electric compressor as long as it is an electric compressor incorporating an 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, the terminal connection portion is cut by the vibration applied from the outside of the compressor by adopting the above-described structure for improving the vibration resistance of the terminal connection portion alone or in combination. In addition, it is possible to effectively prevent or suppress instantaneous interruption and damage to surrounding insulating members, and to maintain a stable connection state even under use environment conditions in which vibration is present. Further, compared to the case of having the epoxy resin casting process as described above, the resin casting process can be eliminated, so that the resin preparation and the curing time are unnecessary, and the productivity can be improved.

Hereinafter, preferred embodiments of 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 a structure for improving the vibration resistance of the terminal connection portion of the built-in electric motor of the hybrid compressor shown in FIG. 1, but the structure shown in FIG. 2 is not limited to the hybrid compressor. This structure can also be applied to an electric compressor having only a built-in electric motor as a drive source.

  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 casing 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. An electric motor 35 is built in to drive the drive shaft 33 of the second compression mechanism 3. The electric motor 35 includes a rotor 36 fixed to the drive shaft 33 and a stator 37. The stator 37 is attached to a stator housing 38 or a stator housing 38 formed as a part of the compressor housing. The entire electric motor 35 is housed in the stator housing 38 while being fixed. 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 passes through the communication path 39 and the suction chamber of the second compression mechanism 3. The refrigerant gas in the working space 32 is compressed by being sucked into 40 and taken into the working space 32 and moving toward the center of the fixed scroll 30 while reducing the volume. 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 turned. 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. As shown in FIG. 2, the details of the terminal portion 50 include a connection portion 53 between a power supply external terminal 51 of the electric motor 35 and an end portion 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.

  In the present embodiment, the connection portion 53 includes a tab housing 56 that holds the power supply external terminal 51, and a receptacle housing 57 that holds the end of the wire 52 of the stator 37 and is fitted to the tab housing 56. It is formed via a coupler structure. More specifically, a hollow portion 58 for accommodating the receptacle housing 57 is formed at the center portion in the tab housing 56, and a support portion 59 extending downward is provided. A hollow portion 60 of a receptacle housing 57 formed in a bottomed shape is fitted to the support portion 59.

  And in this embodiment, the following various structures are employ | adopted as a vibration-proof means of the connection part 53. FIG. First, an O-ring 61 is interposed between the outer peripheral surface of the support portion 59 of the tab housing 56 and the inner peripheral surface of the hollow portion 60 of the receptacle housing 57. The O-ring 61 mainly plays a role of horizontal vibration isolation between the tab housing 56 and the receptacle housing 57.

  Further, the outer end portion (tip portion) of the support portion 59 of the tab housing 56 (the inner end portion depending on the fitting structure with the receptacle housing 57) and the inner end portion (bottom surface portion) of the hollow portion 60 of the receptacle housing 57 ( An elastic body 62 is provided between the tab housing 56 and an outer end portion depending on the fitting structure. In this embodiment, the elastic body 62 is made of a vibration-proof rubber, and is made of a member that can be compressed and deformed in the longitudinal direction (axial direction) and can be expanded in the radial direction. That is, by being compressed and deformed, it plays the role of vibration isolation in the vertical direction between the outer end portion of the support portion 59 of the tab housing 56 and the inner end portion of the hollow portion 60 of the receptacle housing 57, By being in a state of being expanded in the radial direction by the compression, it can play a role of horizontal vibration isolation between the tab housing 56 and the receptacle housing 57.

  Further, between the hollow portion 58 of the tab housing 56 and the outer peripheral portion of the receptacle housing 57, a lock mechanism 63 that locks both the housings is provided. In this embodiment, the locking mechanism 63 is configured such that a claw 64 provided on the tab housing 56 side and a claw 65 provided on the receptacle housing 57 side are engaged with each other. With such a structure, the receptacle housing 57 is prevented from coming off from the tab housing 56, and the elastic body 62 is compressed by pressing the tab housing 56 relative to the receptacle housing 57 from above when locked. The elastic body 62 can be made to exhibit the above-mentioned vibration isolation function.

  Further, a wave washer 66 as an elastic member that can be pressed is provided so that the tab housing 56 faces the inside of the compressor housing, and in this embodiment, the hollow housing 54 of the stator housing 38. This elastic member may be a member that exerts a pressing force other than the wave washer 66, for example, another spring member. The tab housing 56 abuts against a protrusion 67 formed in the hollow protrusion 54 and is held by the pressing force of the wave washer 66 against the lid 55. By installing the wave washer 66, the vibration isolating function of the tab housing 56 in the vertical direction can be exhibited. A flat washer 68 is preferably interposed between the wave washer 66 and the tab housing 56 in order to prevent the surface of the tab housing 56 from being deformed by the pressing force of the wave washer 66.

  Further, an O-ring 69 is interposed between the outer peripheral surface of the tab housing 56 and the compressor housing, and in this embodiment, between the inner peripheral surface of the hollow protrusion 54 of the stator housing 38. It is preferable. By the interposition of the O-ring 69, the horizontal vibration-proof function of the tab housing 56 can be exhibited.

  Further, a pressing plate 70 as a holding member for holding the wire 52 from the stator 37 is attached to the lower portion of the receptacle housing 57, and a wire holding means 71 for elastically holding the wire 52 is attached to the pressing plate 70. Is provided. This wire holding means 71 can be comprised, for example from a rubber member. The wire 52 is elastically held by the wire holding means 71, and the vibration resistance of this portion is improved.

  For example, the wire holding means may be configured as shown in FIG. In the configuration shown in FIG. 3, the wire holding means 80 made of a rubber member that elastically holds the wire 81 from the stator 37 is directly attached to the wire 81 and / or the terminal 82 by caulking or the like, and in this state the inside of the receptacle housing 83 Fitted and held in If comprised in this way, the above-mentioned holding | maintenance board 70 can be abolished and the improvement of an assembly property and cost reduction can be aimed at. Further, since the gap between the wire 81 from the stator 37 and the receptacle housing 83 can be eliminated and the pressing plate 70 can be eliminated, the insulation of this portion can be improved.

  Thus, by providing at least one of the various types of vibration resistance as described above, the vibration resistance of the motor terminal connection portion is improved, and the occurrence of disconnection and instantaneous interruption of the terminal connection portion is prevented or suppressed. Further, compared with the case of casting with the epoxy resin described above, the labor of resin preparation and resin curing can be saved, so that good productivity is ensured.

  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 a terminal portion of the hybrid compressor in FIG. 1. It is a longitudinal cross-sectional view which shows the modification of the terminal part structure of FIG. It is a longitudinal cross-sectional view of the terminal part at the time of casting with the conventional resin.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hybrid compressor 2 as electric compressor 1st compression mechanism 3 2nd compression mechanism 10, 30 Fixed scroll 11, 31 Movable scroll 12, 32 Working space 13, 33 Drive shaft 15 Electromagnetic clutch 18 Suction port 20, 40 Suction chamber 21, 41 Discharge holes 22, 42 Discharge passage 35 Electric motor 36 Rotor 37 Stator 38 Stator housing 39 Communication passage 43 Fixed scroll member 50 Terminal portion 51 Power supply external terminal 52 Wire from stator 53 Connection portion 54 Hollow protrusion 55 Lid 56 Tab housing 57 Receptacle housing 58 Hollow portion 59 Support portion 60 Hollow portion 61 O-ring 62 Elastic body 63 Lock mechanism 64, 65 Claw 66 Wave washer 67 as elastic member Projection portion 68 Flat washer 69 O-ring 70 Holding member as holding member Plate 71 Wire holding means 80 Ear holding means 81 Wire 82 Terminal 83 Receptacle housing

Claims (17)

In the electric compressor having a built-in electric motor for driving the compression mechanism and housing a connection portion between the external terminal for power feeding to the electric motor and the end of the wire from the stator of the electric motor in the compressor housing, the connection And / or vibration preventing means for mechanically preventing at least one of disconnection due to vibration, electrical disconnection, and damage to the insulating member around the connection portion and the connection portion, It is formed via a tab housing that holds an external terminal and a receptacle housing that holds the wire end of the stator, and the vibration-proof means is at least between the tab housing and the receptacle housing. equipped with instrumentation have been vibration means, as the vibration proof means, Bei pressing resilient member toward the tab housing in a compressor housing Electric compressor, characterized by that.   The electric compressor according to claim 1, wherein the tab housing and the receptacle housing are formed in a coupler structure in which the tab housing and the receptacle housing are fitted to each other.   The electric compressor according to claim 1 or 2, wherein the vibration-proof means interposed between the tab housing and the receptacle housing includes an O-ring.   The elastic member interposed between the outer end part or inner end part of the tab housing and the inner end part or outer end part of the receptacle housing is provided as the vibration proof means. The electric compressor of a crab.   5. The electric compressor according to claim 1, further comprising: a lock mechanism provided between the tab housing and the receptacle housing as the vibration proof means, and locking the two housings to each other. The electric compressor according to claim 1, wherein the elastic member includes a wave washer. The electric compressor according to claim 6, wherein a flat washer is interposed between the wave washer and the tab housing. Examples vibration means includes an interposed the O-ring between the tub housing and the compressor housing, an electric compressor according to any one of claims 1-7. Examples vibration means, wherein provided on the receptacle housing side, and a wire holding means for elastically holding the wire from the stator, the electric compressor according to any one of claims 1-8. The electric compressor according to claim 9, wherein the wire holding unit is held by a holding member attached to the receptacle housing. The electric compressor according to claim 9, wherein the wire holding means is attached to a wire from the stator and is held in a receptacle housing. The electric compressor according to any one of claims 1 to 11 , wherein the connecting portion is disposed in a hollow protruding portion that is formed in a housing that houses the electric motor and to which the stator is fixed and extends outward. . The electric compressor according to claim 12, wherein the hollow protrusion is substantially sealed with respect to the outside of the compressor. A first compression mechanism in which the electric compressor is driven only by a first drive source different from 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. consisting hybrid compressor assembled integrally provided in parallel, an electric compressor according to any one of claims 1 to 13. The electric compressor according to claim 14, wherein the first compression mechanism and the second compression mechanism are scroll-type compression mechanisms, and fixed scrolls of both compression mechanisms are arranged back to back. The electric compressor according to claim 15, comprising a fixed scroll member integrally formed with both fixed scrolls arranged back to back. The electric compressor according to claim 15 or 16 , wherein the first drive source comprises a vehicle prime mover.

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