JP2008082279A - Electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress degradation of cooling efficiency of an inverter circuit 20 of an electric compressor 100. <P>SOLUTION: Since a cluster block 40 and an airtight terminal 50 are arranged on an axial end side of a stator core 14 in this electric compressor 100, the need of arranging a housing part of the cluster block 40 in a direction orthogonal to the axis between the stator core 14 and a motor housing 11 is obviated, whereby a flow rate of a refrigerant in a fluid passage 11d is prevented from being reduced by the arrangement of the cluster block 40 and the airtight terminal 50. Thereby, degradation of cooling efficiency of the inverter circuit 20 can be suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric compressor that drives a compressor by an electric motor.

  Conventionally, an inverter circuit is arranged on a housing of an electric compressor, provided in a cooling refrigerant flow path between an inner wall of the housing on the inverter circuit side and a stator core of the electric motor, and the inverter circuit is formed by the refrigerant flowing in the refrigerant flow path. What is comprised so that it may cool is known (for example, refer patent document 1).

Further, although Patent Document 1 does not describe a connection configuration between the inverter circuit and the electric motor, as shown in FIG. 9, one end side is connected to the inverter circuit 2 through the inside and outside of the housing 1. An inverter-side connector (contact terminal) 3 and a stator-side connector 4 connected to the stator coil are provided, and the stator-side connector 4 is arranged in a direction orthogonal to the stator core 5 (that is, on the outer wall surface side of the stator core 5). An electric compressor connected to the inverter side connector 3 is known.
JP 2003-262187 A

  However, in the above-described electric compressor, when the stator-side connector 4 is arranged in the direction perpendicular to the axis with respect to the stator core 5, the storage portion 1a for accommodating the stator-side connector 4 between the stator core 5 and the housing 1 is arranged in the direction perpendicular to the axis. The refrigerant flows into the storage portion 1a, and the amount of the refrigerant flowing into the cooling refrigerant flow path 1b is reduced. Therefore, the cooling efficiency of the inverter circuit 2 is reduced.

  In view of the above points, an object of the present invention is to provide an electric compressor in which the arrangement of connectors is devised to suppress a decrease in cooling efficiency of a drive electric circuit.

  In order to achieve the above object, according to the present invention, a fluid flow path is formed between the drive electrical circuit side of the housing and the stator core through which fluid flows in accordance with suction and discharge of the compressor. The stator side connector configured to be cooled by the fluid in the fluid flow path, housed in the housing and connected to the stator coil, and the electric circuit side electrically connecting the stator side connector and the drive electric circuit The first feature is that the stator side connector and the electrical circuit side connector are arranged on the axial end portion side of the stator core.

  Therefore, since it is not necessary to provide the stator-side connector housing portion in the direction perpendicular to the axis between the stator core and the housing, the arrangement of the stator-side connector and the electric circuit-side connector does not reduce the fluid flow rate in the fluid flow path. . For this reason, the fall of the cooling efficiency of a drive electric circuit (inverter circuit) can be suppressed.

  Further, in the present invention, an annular wall portion formed so as to surround the opening portion is provided on the outer wall side with respect to the opening portion of the housing, and the electric circuit side connector is disposed inside the annular wall portion. This is the second feature.

  Thereby, since it becomes possible to guide the electrical circuit side connector when the annular wall portion is disposed in the opening, it is easy to attach the electrical circuit side connector.

  In the present invention, the electrical circuit side connector is fitted with a sealing ring member formed so as to surround the periphery thereof, and the annular wall portion is provided with an annular groove portion formed so as to surround the opening. The third feature is that the sealing ring member is fitted in the annular groove to seal between the electrical circuit side connector and the annular wall.

  Therefore, even if the electric circuit side connector is disposed inside the annular wall portion, the refrigerant in the housing can be prevented from leaking outside from the opening.

  1 and 2 show an electric compressor 100 according to an embodiment of the present invention. FIG. 1 shows the configuration of a refrigeration cycle apparatus to which the electric compressor 100 of the present embodiment is applied, and FIG. 2 shows the internal configuration of the electric compressor 100.

  As shown in FIG. 1, the electric compressor 100 constitutes a refrigeration cycle device for a vehicle air conditioner together with a condenser 101, a decompressor 102, and an evaporator 103.

  As shown in FIG. 2, the electric compressor 100 includes an electric motor unit 10, an inverter circuit 20, a compressor 30, a cluster block 40, and an airtight terminal 50.

  The electric motor unit 10 rotationally drives the compressor 30 via the rotary shaft 12. Specifically, the electric motor unit 10 includes a motor housing 11, a rotating shaft 12, a rotor 13, a stator core 14, and a stator coil 15.

  The motor housing 11 is made of a metal such as iron having high heat conductivity, and is formed in a substantially cylindrical shape centering on the rotating shaft 12. A refrigerant suction port is provided at one end side in the axial direction Z of the motor housing 11. 11a is provided.

  Here, a refrigerant discharge port 11 b is provided on the other end side in the axial direction Z of the motor housing 11. A mounting surface 16 on which the inverter circuit 20 is mounted is formed on the outer wall of the motor housing 11 in the direction perpendicular to the axis (the upper side in FIG. 2). The axis orthogonal direction is a direction orthogonal to the rotation axis 12. The motor housing 11 corresponds to the housing described in the claims.

  The rotating shaft 12 is disposed in the motor housing 11 and is rotatably supported by a bearing 12a and another bearing (not shown). The rotating shaft 12 transmits the rotational driving force received from the rotor 13 to the compressor 30. The bearing 12 a and other bearings are supported by the motor housing 11.

  The rotor 13 is made of a permanent magnet and is formed in a cylindrical shape having a hollow portion, and the rotary shaft 12 is inserted and fixed in the hollow portion. The rotor 13 rotates together with the rotating shaft 12 based on the rotating magnetic field generated from the stator core 14.

  The stator core 14 is disposed radially outward with respect to the rotor 13 (rotating shaft 12), and the stator core 14 is formed in a substantially annular shape within the motor housing 11. The stator core 14 is made of a magnetic material and is supported from the inner peripheral surface of the motor housing 11. The stator coil 15 is composed of three coils (U, V, W) and is wound around the stator core 14.

  Here, a refrigerant flow path 11d is formed between the mounting surface 16 side of the motor housing 11 and the stator core 14, and the refrigerant flow path 11d is a refrigerant (in order to cool the inverter circuit 20 as described later). Fluid).

  The inverter circuit 20 is composed of a semiconductor element or the like, and constitutes a drive electric circuit that supplies power to the electric motor unit 10 to drive it. The inverter circuit 20 is mounted on the mounting surface 16 of the motor housing 11.

  The inverter cover 21 is a metal housing member formed so as to cover the inverter circuit 20, and the inverter cover 21 holds the inverter circuit 20 between the motor housing 11. The inverter cover 21 is fastened to the motor housing 11 with bolts (not shown).

  The compressor 30 is a rotary compressor, and the compressor 30 is swung by the rotational driving force from the rotating shaft 12 of the electric motor unit 10 to suck, compress, and discharge the refrigerant.

    The cluster block 40 constitutes a stator-side connector to which the end of the stator coil 15 is connected. The cluster block 40, together with the airtight terminal 50, is the axial end portion side (Z direction end portion side) of the stator core 14. , The stator core 14 and the compressor 30 are disposed. The cluster block 40 is connected to the inverter circuit 20 via an airtight terminal 50.

  FIG. 3 shows a connection structure of the cluster block 40 and the hermetic terminal 50. FIG. 3 is an enlarged view of a portion A in FIG. An opening 17 that opens inward is provided on the inner wall of the motor housing 11, and the opening 17 is positioned on the corner side (compressor 30 side) of the inverter circuit 20.

  As shown in FIG. 4, the opening 17 is formed in an elliptical shape extending from the central side in the direction perpendicular to the axis (that is, the front side of the paper surface in FIG. 2) toward the side surface side (that is, the back side of the paper surface in FIG. 2). Has been. 4 is a view as seen from the Y direction in FIG.

  The end 17a (that is, the end side in the terminal arrangement direction) of the opening 17 on the side surface in the direction perpendicular to the axis is centered on a terminal 53 (see FIG. 7: end terminal in the arrangement direction) of the hermetic terminal 50 described later. It is formed in an arc shape. In addition, the end 17b (that is, the end side in the terminal arrangement direction) of the opening 17 at the center in the direction perpendicular to the axis is centered on a terminal 51 (see FIG. 7: end terminal in the arrangement direction) of an airtight terminal 50 described later. It is formed in an arc shape.

  Here, the opening area of the opening 17 on the side surface in the direction perpendicular to the axis is set to be larger than the opening area on the center side in the direction perpendicular to the axis of the opening 17. Then, the side surface in the direction perpendicular to the axis of the cluster block 40 enters the side surface (17a) in the direction perpendicular to the axis of the opening 17 as shown in FIG. FIG.4 (b) is BB sectional drawing in Fig.4 (a).

  Further, as shown in FIG. 5, an annular wall portion 18 formed so as to surround the opening portion 17 is provided outside the motor housing 11 with respect to the opening portion 17 (that is, on the outer wall side). The annular wall portion 18 in FIG. 5 is a view seen from the G direction in FIG. 3.

  As shown in FIG. 2, an edge portion 17 a that protrudes inside the annular wall portion 18 is provided on the inner side of the motor housing 11 in the annular wall portion 18. As shown in FIG. 4A, the edge portion 17a is formed on the center side in the direction perpendicular to the axis, and supports the airtight terminal 50 from the inner side of the motor housing 11 as described later.

  As shown in FIG. 3, the airtight terminal 50 is disposed in the annular wall portion 18, and includes terminals 51, 52, 53 (only one terminal 51 is shown in FIG. 3) and an oval housing 54. I have. The terminals 51, 52, 53 are formed so as to penetrate the inside and outside of the motor housing 11 through the annular wall portion 18, and the terminals 51, 52, 53 are arranged in one row (axial orthogonal direction: from the front side of the page in FIG. 2). Are lined up (toward the back of the page).

  One end side of each of the terminals 51, 52, 53 is connected to the cluster block 40. The other end side of each of the terminals 51, 52, 53 is connected to the inverter circuit 20.

  The housing 54 is made of an electrically insulating member and realizes high electrical insulation between the terminals 51, 52, 53 and the annular wall 18, and between the terminals 51, 52, 53 and the annular wall 18. It maintains high airtightness.

  The housing 54 is fitted with a metal O-ring (seal ring member) 43 so as to surround the periphery of the housing 54, and the O-ring 43 is located in the annular groove 43 a of the annular wall portion 18. The O-ring 43 is used to seal between the hermetic terminal 50 and the annular wall portion 18.

  As shown in FIG. 7, two circlips 44 as metal elastic members are arranged on the inverter circuit 20 side of the housing 54 of the hermetic terminal 50. FIG. 7 is a view of two circlips 44 (that is, C-rings) viewed from the G direction in FIG. The two circlips 44 are disposed in the annular groove 44a of the annular wall portion 18, and the two circlips 44 lock the airtight terminal 50 by an elastic force acting in the radially outward direction.

  Here, the assembly of the airtight terminal 50 and the cluster block 40 will be described.

  First, the hermetic terminal 50, the O-ring 43, and the two circlips 44 are prepared separately. Next, the housing 54 of the hermetic terminal 50 is press-fitted into the O-ring 43, and the hermetic terminal 50 is inserted into the O-ring 43. Fit and fix both.

  Next, when the airtight terminal 50 and the O-ring 43 are pushed into the annular wall portion 18, the O-ring 43 (airtight terminal 50) is guided by the annular wall portion 18, so that the O-ring 43 is an annular groove portion of the annular wall portion 18. Then, the O-ring 43 is press-fitted into the annular groove 43a. On the other hand, the housing 54 of the airtight terminal 50 is supported from the inner side of the motor housing 11 by the edge portion 17a.

  Next, in a state where the two circlips 44 are elastically deformed and compressed in the radially inward direction (arrow Kn direction in FIG. 7), as shown in FIG. 3, the airtight terminal 50 side (that is, the outer wall) Side). Then, the two circlips 44 are elastically deformed and extended in the radially outward direction (the direction opposite to the arrow Kn direction in FIG. 7) by elastic force, and are fitted into the annular groove 44 a of the annular wall portion 18.

  As described above, when the airtight terminal 50 is attached to the motor housing 11, the cluster block 40 is connected to the terminals 51, 52, and 53 of the airtight terminal 50 in the motor housing 11.

  Next, the operation of the electric compressor 100 of the present embodiment will be described.

  First, the inverter circuit 20 is turned on, and a driving current is supplied to the stator coil 15 of the electric motor unit 10. Along with this, a rotating magnetic field is generated from the stator core 14, and thus a rotational force is generated on the rotor 13. Then, the rotor 13 rotates with the rotating shaft 12. Therefore, the compressor 30 is turned by the rotational driving force from the rotary shaft 12 to suck, compress, and discharge the refrigerant.

  Here, the refrigerant from the evaporator side flows into the refrigerant suction port 11a side of the motor housing 11, and the refrigerant flows in the refrigerant channel 11d in the axial direction as indicated by the arrow R in FIG. Flowing. Thereafter, the refrigerant is compressed by the compressor 30 and discharged from the refrigerant discharge port 11b to the condenser side.

  On the other hand, although the inverter circuit 20 generates heat with the operation, the refrigerant in the refrigerant flow path 11 d can cool the inverter circuit 20 through the motor housing 11.

  According to the present embodiment described above, since the cluster block 40 and the airtight terminal 50 are arranged on the axial end portion side of the stator core 14, the storage portion of the cluster block 40 is axially orthogonal between the stator core 14 and the motor housing 11. Since it is not necessary to provide in the direction, the refrigerant flow rate in the fluid flow path 11d is not reduced by the arrangement of the cluster block 40 and the airtight terminal 50. For this reason, the fall of the cooling efficiency of the inverter circuit 20 can be suppressed.

  Further, according to the present embodiment, the opening area on the side surface in the direction perpendicular to the axis of the opening 17 of the motor housing 11 is set to be larger than the opening area on the center side in the direction perpendicular to the axis of the opening 17. .

  Further, as shown in FIG. 8A, when the opening area on the side surface in the direction perpendicular to the axis of the opening 17 of the motor housing 11 and the opening area on the center side in the direction perpendicular to the axis of the opening 17 are set in the same manner. 8B shown in FIG. 8B, the side surface in the direction perpendicular to the axis of the cluster block 40 may interfere with the inner wall of the motor housing 11. This is because the cross section in the direction perpendicular to the axis of the inner wall of the motor housing 11 is formed in a substantially arc shape with the rotation axis as the center, so that the inner wall of the motor housing 11 hangs down to the cluster block 40 side toward the axis crossing side. Because it comes. In order to avoid interference between the cluster block 40 and the inner wall of the motor housing 11, it is necessary to increase the size of the motor housing 11.

  On the other hand, in the present embodiment, the opening area on the side surface in the direction perpendicular to the axis of the opening 17 of the motor housing 11 is set to be larger than the opening area on the center side in the direction perpendicular to the axis of the opening 17. ing. Therefore, the side surface in the direction perpendicular to the axis of the cluster block 40 can be inserted into the side surface in the direction perpendicular to the axis of the opening 17 as shown in FIG. For this reason, the size of the motor housing 11 can be reduced.

  Further, in this embodiment, an O-ring (sealing ring member) 43 is fitted in the housing 54, and the O-ring 43 is located in the annular groove 43 a of the annular wall portion 18 and is connected to the airtight terminal 50. The space between the annular wall portion 18 is sealed. For this reason, even if the hermetic terminal 50 is arranged in the annular wall portion 18, it is possible to prevent the refrigerant from the inside of the housing 54 from leaking through the annular wall portion 18.

  Further, since the airtight terminal 50 is locked by the circlip 44, the airtight terminal 50 comes out from the annular wall portion 18 to the outside of the motor housing 11 even when the refrigerant pressure from the inside of the housing 54 is high. There is nothing.

  Further, in the present embodiment, the end portion 17a on the side surface side (that is, the arrangement direction) in the axis orthogonal direction of the opening portion 17 has an arc shape centering on the terminal 53 (see FIG. 7) on one end side in the axis orthogonal direction. The end 17b of the opening 17 on the center side in the direction perpendicular to the axis is formed in an arc shape centered on the terminal 51 (see FIG. 7) on the other end in the direction perpendicular to the axis. Therefore, sufficient electrical insulation can be achieved for the terminals 51 and 53 on both sides of the opening 17 in the direction perpendicular to the axis.

  In this embodiment, the ring 43 is guided by the annular wall 18 together with the airtight terminal 50, and the O-ring 43 is press-fitted into the annular groove 43 a of the annular wall 18. For this reason, mounting | wearing of the airtight terminal 50 with respect to the inside of the annular wall part 18 can be performed easily.

(Other embodiments)
In the above-described embodiment, the example in which the opening 17a of the motor housing 11 is formed in an elliptical shape has been described. Alternatively, the opening 17a of the motor housing 11 may be formed in a true circle.

  In the above-described embodiment, the example in which the cluster block 40 and the airtight terminal 50 are arranged between the stator core 14 and the compressor 30 has been described. Instead, the cluster block 40 and the airtight terminal 50 are connected to the stator core 14 with respect to the compressor. You may arrange | position in the axial direction edge part on the opposite side to 30.

It is a mimetic diagram showing the refrigerating cycle device to which the electric compressor concerning the present invention is applied. It is a figure which shows the internal structure of the electric compressor which concerns on the above-mentioned embodiment. FIG. 3 is an enlarged view of a portion A in FIG. 2. It is a figure which shows the relationship between the opening part in FIG. 2, and a cluster block. It is a figure which shows the opening part in FIG. 2 in FIG. It is a figure which shows the airtight terminal in FIG. It is a figure which shows the airtight terminal and circlip in FIG. It is a figure which shows the relationship between an opening part and a cluster block. It is a figure which shows the internal structure of the conventional electric compressor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Electric motor part, 11 ... Motor housing, 14 ... Stator core,
20 ... Inverter circuit, 30 ... Compressor, 40 ... Cluster block,
50 ... Airtight terminal, 100 ... Electric compressor.

Claims (7)

A housing having a fluid inlet and a fluid outlet;
A compressor housed in the housing and compressing the fluid sucked from the fluid suction port and discharging the fluid from the fluid discharge port;
A rotor housed in the housing and having a rotating shaft that is rotatably supported and rotated by a rotating magnetic field, a stator core disposed radially outward with respect to the rotor, and wound around the stator core An electric motor unit having a stator having a stator coil; and
A driving electric circuit that is mounted on the outer wall of the housing and generates a rotating magnetic field from the stator coil by causing a current to flow through the stator coil;
Between the drive electric circuit side of the housing and the stator core, a fluid flow path is formed through which the fluid flows along with suction and discharge of the compressor.
The drive electrical circuit is configured to be cooled by a fluid in the fluid flow path;
A stator-side connector housed in the housing and connected to the stator coil;
An electrical circuit side connector for electrically connecting the stator side connector and the drive electrical circuit;
The electric compressor, wherein the stator-side connector and the electric circuit-side connector are disposed on an axial end portion side of the stator core. The compressor is connected to one end side of the rotating shaft,
The electric compressor according to claim 1, wherein the stator-side connector is disposed between the compressor and the stator core. The cross section in the direction perpendicular to the axis of the inner wall of the housing is formed in a substantially arc shape with the rotation axis as the center,
An opening is formed in the inner wall of the housing, and the electric circuit side connector penetrates the inside and outside of the housing through the opening,
The opening is formed such that the opening area on the side surface in the axis orthogonal direction is larger than the opening area on the center side in the axis orthogonal direction,
3. The electric compressor according to claim 1, wherein the side surface in the direction orthogonal to the axis of the stator side connector enters the opening while avoiding interference with an inner wall of the housing. The electric compressor according to any one of claims 1 to 3, wherein the stator side connector is arranged on a corner side of the drive electric circuit. An annular wall portion formed so as to surround the opening portion is provided on the outer wall side with respect to the opening portion of the housing,
The electric compressor according to claim 3 or 4, wherein the electric circuit side connector is arranged inside the annular wall portion. The electrical circuit side connector is fitted with a sealing ring member formed so as to surround the periphery thereof,
The annular wall is provided with an annular groove formed so as to surround the opening,
6. The electric compressor according to claim 5, wherein the sealing ring member is fitted in the annular groove portion so as to seal between the electric circuit side connector and the annular wall portion. The electrical circuit side connector includes a plurality of terminals penetrating through the inside and outside of the housing in the opening and arranged in a line,
The end side in the arrangement direction of the terminals in the opening is formed in an arc shape centering on the end terminal in the arrangement direction among the plurality of terminals. The electric compressor as described in one.

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