JP7095611B2 - Electric compressor - Google Patents

Description

The present invention relates to an electric compressor.

The electric compressor includes a tubular housing, and a rotating shaft, a compression unit that compresses a fluid by rotation of the rotating shaft, and an electric motor that rotates the rotating shaft are housed in the housing. Further, the electric compressor includes a motor control device for driving the electric motor. The motor control device has a power board on which a switching element that performs a switching operation for driving an electric motor is mounted, and a filter element. For example, in the electric compressor of Patent Document 1, the power substrate is housed in the inverter accommodating portion formed in the housing. On the other hand, the filter element is housed in a filter box (housing case) attached to the outer peripheral surface of the housing. Therefore, the electric compressor of Patent Document 1 has a configuration in which a portion accommodating a power substrate and a portion accommodating a filter element are separately provided.

Japanese Unexamined Patent Publication No. 2009-275606

By the way, in an electric compressor that handles a large current, the filter element is a large component. Therefore, when the filter element is housed in the filter box as in Patent Document 1, for example, the filter box containing the filter element is used. growing. Since the filter box is attached to the outer peripheral surface of the housing, when the filter box becomes large, for example, when an electric compressor is mounted on the vehicle, the body of the vehicle deformed due to the external force due to the collision of the vehicle becomes , It becomes easy to come into contact with the filter box, and the filter element may be affected by the external force due to the collision. In particular, since a large amount of electric charge is accumulated in the capacitor which is a part of the filter element, it is required not to be affected by the external force due to the collision.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an electric compressor capable of suppressing the influence of an external force due to a collision on a filter element. be.

An electric compressor that solves the above problems performs a switching operation to drive a rotary shaft, a compression unit that compresses fluid by rotation of the rotary shaft, an electric motor that rotates the rotary shaft, and the electric motor. A power board on which a switching element is mounted, a motor control device having a filter element, a tubular housing accommodating the rotating shaft, the compression unit, the electric motor, and the power board, and an outer peripheral surface of the housing. A pair of motorized compressors that are attached and include a filter box that houses the filter elements, wherein the housings project from portions of the outer peripheral surface of the housing that are spaced apart from each other in the axial direction of the axis of rotation. It has mounting legs, and the filter box is mounted on the outer peripheral surface of the housing with the filter elements arranged between the pair of mounting legs.

According to this, since a pair of mounting legs are arranged on both sides of the rotating shaft in the axial direction with respect to the filter element, the pair of mounting legs protect the filter element from both sides in the axial direction of the rotating shaft. Can be done. Therefore, it is possible to prevent the filter element from being affected by an external force due to a collision.

In the electric compressor, the housing includes a motor housing for accommodating the electric motor, and the motor housing has a suction port for sucking a refrigerant as the fluid into the motor housing from the outside. An annular ridge is formed on at least one of the outer peripheral surface of the motor housing and the outer surface of the filter box, and the annular sealing member is in contact with the ridge, and the outer peripheral surface of the motor housing, The filter box, the ridges, and the sealing member form a grease accommodating chamber in which the radiating grease is accommodated, and the filter element is thermally connected to the motor housing via the filter box and the radiating grease. It should be combined with.

According to this, the heat generated from the filter element is efficiently dissipated to the motor housing via the filter box and the thermal paste, so that the durability of the filter element can be improved. In particular, in a configuration in which a suction port is formed in the motor housing, since the low-temperature suction refrigerant is inside the motor housing, heat is dissipated more efficiently.

In the electric compressor, the filter box has a bottomed cylindrical box body for accommodating the filter element and a box cover for closing the opening of the box body, and the box body is the housing. It is arranged between the box cover and the box cover, and the box cover may be made of a material having a higher rigidity than the box body.

According to this, since the box cover made of a material having a higher rigidity than the box body is arranged on the side opposite to the housing with respect to the filter element, the box cover filters from the side opposite to the housing. The element can be protected. Therefore, it is possible to further suppress that the filter element is affected by the external force due to the collision.

According to the present invention, it is possible to prevent the filter element from being affected by an external force due to a collision.

The perspective view which shows the electric compressor in an embodiment. Side sectional view of the electric compressor. A circuit diagram showing the electrical configuration of an electric compressor. An exploded perspective view of the filter box. An exploded perspective view of the box body and the filter board. An exploded perspective view of the electric compressor. Partial sectional view of an electric compressor.

Hereinafter, an embodiment embodying the electric compressor will be described with reference to FIGS. 1 to 7. The electric compressor of this embodiment is used, for example, in a vehicle air conditioner. The electric compressor is located in the engine room of the vehicle.

As shown in FIG. 1, the housing 11 of the electric compressor 10 has a cylindrical shape. The housing 11 has a bottomed cylindrical motor housing 12, a bottomed cylindrical discharge housing 13 connected to the motor housing 12, and an inverter cover 14 attached to the motor housing 12. The motor housing 12, the discharge housing 13, and the inverter cover 14 are made of a metal material, for example, aluminum.

As shown in FIG. 2, the motor housing 12 has a bottom wall 12a and a peripheral wall 12b extending in a cylindrical shape from the outer peripheral edge of the bottom wall 12a. The discharge housing 13 is connected to an end portion of the peripheral wall 12b of the motor housing 12 opposite to the bottom wall 12a. The discharge housing 13 closes the opening of the peripheral wall 12b of the motor housing 12 on the side opposite to the bottom wall 12a.

The electric compressor 10 includes a rotary shaft 15, a compression unit 16 that compresses a refrigerant as a fluid by rotation of the rotary shaft 15, and an electric motor 17 that rotates the rotary shaft 15. The rotating shaft 15, the compression unit 16, and the electric motor 17 are housed in the motor housing 12. The rotary shaft 15 is rotatably supported by the motor housing 12. The compression unit 16 is arranged closer to the discharge housing 13 than the electric motor 17 in the axial direction of the rotating shaft 15. The compression unit 16 is, for example, a scroll type including a fixed scroll (not shown) fixed in the motor housing 12 and a movable scroll (not shown) arranged opposite to the fixed scroll. The compression unit 16 is not limited to the scroll type, and may be, for example, a piston type or a vane type.

The electric motor 17 includes a rotor 17a that is fixed to the rotating shaft 15 and rotates integrally with the rotating shaft 15, and a stator 17b that is fixed to the inner peripheral surface of the peripheral wall 12b of the motor housing 12 and surrounds the rotor 17a. Has been done. A coil 18 is wound around the teeth of the stator 17b. Then, the rotor 17a and the rotating shaft 15 rotate by supplying electric power to the coil 18.

A suction port 12h is formed on the peripheral wall 12b of the motor housing 12. Further, a discharge port 13h is formed in the discharge housing 13. One end of an external refrigerant circuit (not shown) is connected to the suction port 12h. The other end of the external refrigerant circuit is connected to the discharge port 13h. Then, the refrigerant is sucked into the motor housing 12 from the external refrigerant circuit through the suction port 12h, and the refrigerant sucked into the motor housing 12 is compressed by the compression unit 16. The refrigerant compressed by the compression unit 16 is discharged into the discharge housing 13 and discharged to the external refrigerant circuit through the discharge port 13h, passes through the heat exchanger and expansion valve of the external refrigerant circuit, and passes through the suction port 12h. Is returned to the motor housing 12. The electric compressor 10 and the external refrigerant circuit constitute a vehicle air conditioner.

The motor housing 12 has a tubular extending wall 12c extending from the bottom wall 12a toward the side opposite to the discharge housing 13 in the axial direction of the rotating shaft 15. The inverter cover 14 is fitted to the extension wall 12c so as to close the opening of the extension wall 12c while being fitted inside the opening of the extension wall 12c. The outer surface of the bottom wall 12a of the motor housing 12, the inner peripheral surface of the extending wall 12c, and the inverter cover 14 form an inverter accommodating chamber 19. A cylindrical connector connecting portion 14a is provided so as to project from the outer surface of the inverter cover 14.

The motor housing 12 has a cylindrical first mounting leg 21 and a second mounting leg 22. The first mounting leg 21 and the second mounting leg 22 are located on both sides of the rotating shaft 15 in the radial direction with the rotating shaft 15 interposed therebetween. The first mounting leg 21 is located on the outer peripheral surface of the motor housing 12 from a portion located closer to the bottom wall 12a of the motor housing 12 and on the side opposite to the extending wall 12c from the bottom wall 12a of the motor housing 12. It protrudes outward. The second mounting leg 22 projects outward from a portion of the outer peripheral surface of the motor housing 12 located closer to the extending wall 12c than the first mounting leg 21 in the axial direction of the rotating shaft 15. A part of the second mounting leg 22 projects outward from the outer peripheral surface of the extending wall 12c. The axis of the first mounting leg 21 and the axis of the second mounting leg 22 are parallel to each other. The axis of the first mounting leg 21 and the axis of the second mounting leg 22 extend in a direction orthogonal to the axial direction of the rotating shaft 15 when the electric compressor 10 is viewed from the axial direction of the rotating shaft 15. ..

The discharge housing 13 has a cylindrical third mounting leg 23 and a fourth mounting leg 24. The third mounting leg 23 and the fourth mounting leg 24 are located on both sides of the rotating shaft 15 in the radial direction with the axis of the rotating shaft 15 interposed therebetween. The third mounting leg 23 and the fourth mounting leg 24 project outward from the outer peripheral surface of the discharge housing 13. The axis of the third mounting leg 23 and the axis of the fourth mounting leg 24 are parallel to each other. The axis of the third mounting leg 23 and the axis of the fourth mounting leg 24 extend in a direction orthogonal to the axial direction of the rotating shaft 15 when the electric compressor 10 is viewed from the axial direction of the rotating shaft 15. ..

The first mounting leg 21 and the third mounting leg 23 are respectively arranged at positions facing each other in the axial direction of the rotating shaft 15. Therefore, the first mounting leg 21 and the third mounting leg 23 are a pair of mounting legs that each project from a portion of the outer peripheral surface of the housing 11 that is separated from each other in the axial direction of the rotating shaft 15. Further, the second mounting leg 22 and the fourth mounting leg 24 are respectively arranged at positions facing each other in the axial direction of the rotating shaft 15. Therefore, the second mounting leg 22 and the fourth mounting leg 24 are a pair of mounting legs that each project from a portion of the outer peripheral surface of the housing 11 that is separated from each other in the axial direction of the rotating shaft 15. Therefore, in the present embodiment, the housing 11 has two sets of a pair of mounting legs protruding from portions separated from each other in the axial direction of the rotating shaft 15 on the outer peripheral surface of the housing 11. In the electric compressor 10 of the present embodiment, for example, a bolt (not shown) that has passed through each of the first mounting leg 21, the second mounting leg 22, the third mounting leg 23, and the fourth mounting leg 24 is a vehicle body. It is attached to the body by being screwed into.

As shown in FIG. 3, the coil 18 of the electric motor 17 has a three-phase structure including a u-phase coil 18u, a v-phase coil 18v, and a w-phase coil 18w. In the present embodiment, the u-phase coil 18u, the v-phase coil 18v, and the w-phase coil 18w are Y-connected.

The electric compressor 10 includes a motor control device 20 that drives the electric motor 17. The motor control device 20 has a power board 25 on which a plurality of switching elements Qu1, Qu2, Qv1, Qv2, Qw1, Qw2 are mounted. The plurality of switching elements Qu1, Qu2, Qv1, Qv2, Qw1, Qw2 perform a switching operation in order to drive the electric motor 17. The plurality of switching elements Qu1, Qu2, Qv1, Qv2, Qw1, Qw2 are IGBTs (power switching elements). Diodes Du1, Du2, Dv1, Dv2, Dw1, and Dw2 are connected to the plurality of switching elements Qu1, Qu2, Qv1, Qv2, Qw1, and Qw2, respectively.

The switching elements Qu1 and Qu2, the switching elements Qv1 and Qv2, and the switching elements Qw1 and Qw2 are connected in series, respectively. The gates of the switching elements Qu1, Qu2, Qv1, Qv2, Qw1, Qw2 are electrically connected to the control computer 26. The collectors of the switching elements Qu1, Qv1, and Qw1 are electrically connected to the positive electrode of the DC power supply 27 via the first connection line EL1. The emitters of the switching elements Qu2, Qv2, and Qw2 are electrically connected to the negative electrode of the DC power supply 27 via the second connection line EL2. The emitter of each switching element Qu1, Qv1, Qw1 and the collector of each switching element Qu2, Qv2, Qw2 are electrically connected to the u-phase coil 18u, the v-phase coil 18v, and the w-phase coil 18w from the intermediate points connected in series, respectively. Is connected. Further, each switching element Qu1, Qu2, Qv1, Qv2, Qw1, Qw2 is thermally coupled to the bottom wall 12a, respectively, and can exchange heat with the low-temperature refrigerant sucked into the motor housing 12. ..

The control computer 26 controls the drive voltage of the electric motor 17 by pulse width modulation. Specifically, the control computer 26 generates a PWM signal by a high-frequency triangular wave signal called a carrier wave signal and a voltage command signal for instructing a voltage. Then, the control computer 26 controls on / off of each switching element Qu1, Qu2, Qv1, Qv2, Qw1, Qw2 by using the generated PWM signal. As a result, the DC voltage from the DC power supply 27 is converted into an AC voltage. Then, the converted AC voltage is applied to the electric motor 17 as a drive voltage to control the drive of the electric motor 17.

The control computer 26 variably controls the on / off duty ratio of each switching element Qu1, Qu2, Qv1, Qv2, Qw1, Qw2 by controlling the PWM signal. Thereby, the rotation speed of the electric motor 17 is controlled. The control computer 26 is electrically connected to the air conditioning ECU 28, and when it receives information about the target rotation speed of the electric motor 17 from the air conditioning ECU 28, it rotates the electric motor 17 at the target rotation speed.

Further, the motor control device 20 has a filter board 34 on which a common mode choke coil 30, a first bypass capacitor 31, a second bypass capacitor 32, and a smoothing capacitor 33 are mounted. The common mode choke coil 30 has a first winding 30a provided on the first connection line EL1 and a second winding 30b provided on the second connection line EL2.

One end of the first bypass capacitor 31 is electrically connected to the first connection line EL1. The other end of the first bypass capacitor 31 is electrically connected to one end of the second bypass capacitor 32. Therefore, the first bypass capacitor 31 and the second bypass capacitor 32 are connected in series. The other end of the second bypass capacitor 32 is electrically connected to the second connection line EL2. The midpoint between the other end of the first bypass capacitor 31 and one end of the second bypass capacitor 32 is, for example, grounded to the body of the vehicle.

One end of the smoothing capacitor 33 is electrically connected to the first connection line EL1. The other end of the smoothing capacitor 33 is electrically connected to the second connection line EL2. The first bypass capacitor 31, the second bypass capacitor 32, and the smoothing capacitor 33 are connected in parallel. The smoothing capacitor 33 is provided closer to the power board 25 than the first bypass capacitor 31 and the second bypass capacitor 32.

The common mode choke coil 30, the first bypass capacitor 31, the second bypass capacitor 32, and the smoothing capacitor 33 reduce common mode noise. The common mode noise is noise in which a current flows in the same direction through the first connection line EL1 and the second connection line EL2. Common mode noise can occur when the electric compressor 10 and the DC power supply 27 are electrically connected via a path other than the first connection line EL1 and the second connection line EL2, such as a vehicle body. ..

As shown in FIG. 2, the power board 25 is housed in the inverter housing chamber 19. Therefore, the housing 11 houses the rotating shaft 15, the compression unit 16, the electric motor 17, and the power board 25. Therefore, the electric compressor 10 of the present embodiment has a configuration in which the compression unit 16, the electric motor 17, and the power substrate 25 are arranged side by side in the axial direction of the rotating shaft 15 in this order.

The electric compressor 10 includes a filter box 40 that houses the filter substrate 34. Therefore, the filter box 40 accommodates the common mode choke coil 30, the first bypass capacitor 31, the second bypass capacitor 32, and the smoothing capacitor 33. Therefore, the electric compressor 10 of the present embodiment has a configuration in which a portion accommodating the power substrate 25 and a portion accommodating the filter substrate 34 are separately provided. The filter box 40 is attached to the outer peripheral surface of the motor housing 12.

As shown in FIG. 4, the filter box 40 includes a common mode choke coil 30, a first bypass capacitor 31, a second bypass capacitor 32, a smoothing capacitor 33, and a bottomed cylindrical box body 41 accommodating a filter substrate 34. It has a flat plate-shaped box cover 51 that closes the opening of the box body 41. The box body 41 is made of, for example, aluminum. The box cover 51 is made of iron, for example. Therefore, the box cover 51 is made of a material having higher rigidity than the box body 41.

The box body 41 has a bottom wall 42 and a peripheral wall 43 erected from the outer peripheral portion of the bottom wall 42. A coil accommodating recess 42a and a plurality of capacitor accommodating recesses 42b are formed on the inner surface of the bottom wall 42. The plurality of capacitor accommodating recesses 42b are arranged around the coil accommodating recess 42a. The common mode choke coil 30 is accommodated in the coil accommodating recess 42a. In each capacitor accommodating recess 42b, a first bypass capacitor 31, a second bypass capacitor 32, and each capacitor 35 constituting the smoothing capacitor 33 are accommodated while being mounted on the filter substrate 34. Therefore, a plurality of capacitors 35 are mounted on the filter board 34.

As shown in FIG. 5, the potting resin 36 is applied to each of the coil accommodating recess 42a and each capacitor accommodating recess 42b. The common mode choke coil 30 and each capacitor 35 are housed in a state of being fixed to the coil accommodating recess 42a and each capacitor accommodating recess 42b via the potting resin 36.

As shown in FIG. 4, a first terminal block 44 and a second terminal block 45 are attached to the inner surface of the bottom wall 42. The first terminal block 44 and the second terminal block 45 are made of resin. A pair of columnar male screw portions 44a are provided so as to project from the first terminal block 44. Further, the first terminal block 44 is formed with a first terminal block insertion hole 44h through which the first terminal block mounting screw 44b is inserted. On the inner surface of the bottom wall 42, a female screw hole 42e for mounting the first terminal block into which the first terminal block mounting screw 44b is screwed is formed. The first terminal block 44 is attached to the inner surface of the bottom wall 42 by screwing the first terminal block mounting screw 44b inserted into the first terminal block insertion hole 44h into the first terminal block mounting female screw hole 42e. Has been done. With the first terminal block 44 attached to the inner surface of the bottom wall 42, the pair of male threaded portions 44a extend toward the opening of the box body 41.

A pair of columnar male screw portions 45a are provided so as to project from the second terminal block 45. Further, the second terminal block 45 is formed with a second terminal block insertion hole 45h through which the second terminal block mounting screw 45b is inserted. A second terminal block mounting female screw hole 42f into which the second terminal block mounting screw 45b is screwed is formed on the inner surface of the bottom wall 42. The second terminal block 45 is attached to the inner surface of the bottom wall 42 by screwing the second terminal block mounting screw 45b inserted into the second terminal block insertion hole 45h into the second terminal block mounting female screw hole 42f. Has been done. In a state where the second terminal block 45 is attached to the inner surface of the bottom wall 42, the pair of male screw portions 45a extend toward the opening of the box body 41.

As shown in FIG. 5, four tubular boss portions 42g are provided on the inner surface of the bottom wall 42. The four boss portions 42g extend from the inner surface of the bottom wall 42 toward the opening of the box body 41. Further, the filter substrate 34 is formed with a substrate screw insertion hole 34h into which a substrate mounting screw 46 screwed into each boss portion 42g is inserted.

The filter board 34 has a pair of thin plate-shaped first connection terminals 34a connected to each male threaded portion 44a of the first terminal block 44. Each first connection terminal 34a has a hole 341a through which each male screw portion 44a is inserted. Further, the filter board 34 has a pair of thin plate-shaped second connection terminals 34b connected to each male screw portion 45a of the second terminal block 45. Each second connection terminal 34b has a hole 341b through which each male screw portion 45a is inserted.

As shown in FIG. 4, the filter box 40 includes a wire harness 47 that electrically connects the filter board 34 and the power board 25. At one end of the wire harness 47, a pair of thin plate-shaped harness terminals 47a connected to each male threaded portion 44a of the first terminal block 44 are provided. Each harness terminal 47a has a hole 471a through which each male threaded portion 44a is inserted. A first connector insertion hole 43a is formed in the peripheral wall 43. The pair of harness terminals 47a are inserted into the box body 41 through the first connector insertion hole 43a, and each male screw portion 44a is inserted into the hole 471a of each harness terminal 47a. ..

At the other end of the wire harness 47, a tubular connector connecting portion 47b connected to the connector connecting portion 14a of the inverter cover 14 is provided. The connector connection portion 47b of the wire harness 47 is connected to the connector connection portion 47b of the inverter cover 14, so that the wire harness 47 and the power board 25 are electrically connected.

The filter box 40 includes an external connector 48 that electrically connects the filter board 34 and the DC power supply 27. The external connector 48 has a pair of thin plate-shaped connector terminals 48a connected to each male screw portion 45a of the second terminal block 45. Each connector terminal 48a has a hole 481a through which each male threaded portion 45a is inserted. A second connector insertion hole 42h is formed in the bottom wall 42. The pair of connector terminals 48a are inserted into the box body 41 through the second connector insertion hole 42h, and each male screw portion 45a is inserted into the hole 481a of each connector terminal 48a. ..

Further, the external connector 48 has a tubular connector connecting portion 48b connected to the DC power supply 27. Further, the external connector 48 has a plurality of insertion holes 48h through which bolts 48c are inserted. The external connector 48 is attached to the box body 41 by screwing each bolt 48c inserted into each insertion hole 48h into the box body 41.

As shown in FIG. 5, each harness terminal 47a and each first connection terminal 34a of the filter board 34 have a male threaded portion 44a inserted into a hole 471a of each harness terminal 47a and a hole 341a of each first connection terminal 34a. In this state, each first nut 49a is electrically connected by being screwed into each male threaded portion 44a. Further, each of the connector terminals 48a and the second connection terminals 34b of the filter board 34 has the male threaded portions 45a inserted into the holes 481a of the connector terminals 48a and the holes 341b of the second connection terminals 34b. The second nut 49b is electrically connected by being screwed into each male threaded portion 45a.

The DC power supply 27 and the filter board 34 are electrically connected to each other via the connector connection portion 48b, the pair of connector terminals 48a, and the pair of second connection terminals 34b. Further, the filter board 34 and the power board 25 are electrically connected via a pair of first connection terminals 34a, a pair of harness terminals 47a, a connector connection portion 47b, and a connector connection portion 14a of the inverter cover 14. ..

As shown in FIG. 4, a plurality of female screw holes 43h are formed on the opening end surface of the peripheral wall 43 on the side opposite to the bottom wall 42. Further, the filter box 40 has a plate-shaped gasket 50 that seals between the box body 41 and the box cover 51. The gasket 50 is an annular shape extending along the open end surface of the peripheral wall 43. The gasket 50 is formed with a plurality of bolt insertion holes 50h into which the fastening bolts 52 are inserted. Further, the box cover 51 is formed with a bolt insertion hole 51h through which the fastening bolt 52 is inserted. Then, in the box cover 51, with the gasket 50 arranged between the open end surface of the peripheral wall 43, each bolt insertion hole 51h of the box cover 51 and each fastening bolt 52 passing through each bolt insertion hole 50h of the gasket 50 It is attached to the box body 41 by being screwed into each female screw hole 43h, and closes the opening of the box body 41.

As shown in FIG. 6, an annular ridge 60 is formed between the second mounting leg 22 and the fourth mounting leg 24 on the outer peripheral surface of the peripheral wall 12b of the motor housing 12. The portion inside the ridge 60 on the outer peripheral surface of the peripheral wall 12b of the motor housing 12 is a flat surface. Further, four boss portions 61 are provided around the ridge 60 on the outer peripheral surface of the peripheral wall 12b of the motor housing 12. On the outer peripheral surface of the peripheral wall 43 of the box body 41, a bolt mounting pedestal 63 having a bolt insertion hole 63h through which a bolt 62 screwed into each boss portion 61 is inserted is projected.

As shown in FIGS. 6 and 7, the filter box 40 has a columnar bulging portion 64 that bulges from the outer surface of the bottom wall 42 of the box body 41. The bulging portion 64 bulges in the thickness direction of the bottom wall 42 due to the formation of the coil accommodating recess 42a on the inner surface of the bottom wall 42. The end surface 64a of the bulging portion 64 on the side opposite to the outer surface of the bottom wall 42 has a flat surface shape. The outer diameter of the bulging portion 64 is the same as the outer diameter of the ridge 60.

Further, the filter box 40 has a columnar protruding portion 65 protruding from the end surface 64a of the bulging portion 64. The end surface 65a of the protrusion 65 opposite to the bulge 64 is a flat surface. The outer diameter of the protrusion 65 is smaller than the inner diameter of the ridge 60. The protrusion 65 is inserted inside the ridge 60.

The filter box 40 is arranged with respect to the motor housing 12 so that the end surface 64a of the bulging portion 64 faces the open end surface 60a of the ridge 60. Therefore, the box body 41 is arranged between the motor housing 12 and the box cover 51. The filter box 40 is attached to the outer peripheral surface of the motor housing 12 by screwing the bolt 62 inserted into each bolt insertion hole 63h into each boss portion 61.

As shown in FIG. 2, in a state where the filter box 40 is attached to the outer peripheral surface of the motor housing 12, a part of the common mode choke coil 30 is arranged between the second attachment leg 22 and the fourth attachment leg 24. There is. Therefore, the common mode choke coil 30 is located between the second mounting legs 22 and the fourth mounting legs 24, which are a pair of mounting legs protruding from the portions of the outer peripheral surface of the housing 11 that are separated from each other in the axial direction of the rotating shaft 15. It is a filter element to be arranged.

As shown in FIG. 7, an annular sealing member 66 is arranged between the end surface 64a of the bulging portion 64 and the opening end surface 60a of the ridge 60. Therefore, the seal member 66 is in contact with the ridge 60. The grease accommodating chamber 67 is formed by the outer peripheral surface of the motor housing 12, the filter box 40, the ridges 60, and the seal member 66. Two annular grooves 66a are formed on each of the end surface of the seal member 66 in contact with the end surface 64a of the bulging portion 64 and the end surface of the seal member 66 in contact with the open end surface 60a of the ridge 60. The two annular grooves 66a function as labyrinth seals. Therefore, the sealing member 66 seals the inside and outside of the grease accommodating chamber 67.

The thermal paste 68 is housed in the grease storage chamber 67. Specifically, the thermal paste 68 is applied between the end surface 65a of the protrusion 65 and the outer peripheral surface of the motor housing 12 inside the ridge 60. A part of the thermal paste 68 applied between the end surface 65a of the protrusion 65 and the outer peripheral surface of the motor housing 12 inside the protrusion 60 is the motor housing 12 inside the end surface 65a of the protrusion 65 and the protrusion 60. It is extruded from between the outer peripheral surface of the protrusion 65 to the clearance between the outer peripheral surface of the protrusion 65 and the inner peripheral surface of the ridge 60. A part of the thermal paste 68 extruded into the clearance between the outer peripheral surface of the protrusion 65 and the inner peripheral surface of the protrusion 60 extends over the entire circumference of the outer peripheral surface of the protrusion 65. Therefore, the thermal paste 68 is in contact with the entire surface of the end surface 65a of the protrusion 65. The common mode choke coil 30 is thermally coupled to the motor housing 12 via the filter box 40 and the thermal paste 68. The amount of thermal paste 68 applied between the end surface 65a of the protrusion 65 and the outer peripheral surface of the motor housing 12 inside the protrusion 60 is such that a part of the thermal paste 68 protrudes from the end surface 65a of the protrusion 65. The amount is set to be pushed out from between the outer peripheral surface of the motor housing 12 inside the strip 60 to the clearance between the outer peripheral surface of the protrusion 65 and the inner peripheral surface of the ridge 60.

Next, the operation of this embodiment will be described.
By the way, for example, in the electric compressor 10 that handles a large current, since the common mode choke coil 30 is a large component, the filter box 40 that houses the common mode choke coil 30 is also large. At this time, in the present embodiment, in the filter box 40, the second mounting legs 22 and the fourth mounting legs 24 are arranged on both sides of the rotating shaft 15 in the axial direction with respect to the common mode choke coil 30. It is attached to the outer peripheral surface of the motor housing 12. Therefore, the second mounting leg 22 and the fourth mounting leg 24 protect the common mode choke coil 30 from both sides of the rotating shaft 15 in the axial direction.

Further, the box cover 51 is made of a material having higher rigidity than the box body 41. Therefore, since the box cover 51 made of a material having a higher rigidity than the box body 41 is arranged on the side opposite to the motor housing 12 with respect to the common mode choke coil 30, the box cover 51 causes the motor housing. The common mode choke coil 30 is protected from the side opposite to 12.

Further, since the common mode choke coil 30 is thermally coupled to the motor housing 12 via the filter box 40 and the thermal paste 68, the heat generated from the common mode choke coil 30 is generated by the filter box 40 and the thermal paste 68. The heat is efficiently dissipated to the motor housing 12 via the motor housing 12.

In the above embodiment, the following effects can be obtained.
(1) The filter box 40 is placed on the outer peripheral surface of the motor housing 12 in a state where the common mode choke coil 30 which is a filter element is arranged between the second mounting legs 22 and the fourth mounting legs 24 which are a pair of mounting legs. It is attached. According to this, since the second mounting leg 22 and the fourth mounting leg 24 are arranged on both sides of the rotating shaft 15 in the axial direction with respect to the common mode choke coil 30, the second mounting leg 22 and the fourth mounting leg 22 are arranged. The legs 24 can protect the common mode choke coil 30 from both sides of the rotating shaft 15 in the axial direction. Therefore, it is possible to prevent the common mode choke coil 30 from being affected by an external force due to a vehicle collision.

(2) The common mode choke coil 30 is thermally coupled to the motor housing 12 via the filter box 40 and the thermal paste 68. According to this, the heat generated from the common mode choke coil 30 is efficiently dissipated to the motor housing 12 via the filter box 40 and the thermal paste 68, so that the durability of the common mode choke coil 30 can be improved. can. In particular, in the configuration in which the suction port 12h is formed in the motor housing 12, the low-temperature suction refrigerant is contained in the motor housing 12, so that heat is dissipated more efficiently.

(3) The box cover 51 is made of a material having a higher rigidity than the box body 41. According to this, since the box cover 51 made of a material having a higher rigidity than the box body 41 is arranged on the opposite side of the motor housing 12 with respect to the common mode choke coil 30, the box cover 51 is used. , The common mode choke coil 30 can be protected from the side opposite to the motor housing 12. Therefore, it is possible to further suppress that the common mode choke coil 30 is affected by an external force due to a collision.

(4) A part of the thermal paste 68 applied between the end surface 65a of the protrusion 65 and the outer peripheral surface of the motor housing 12 inside the protrusion 60 is inside the end surface 65a of the protrusion 65 and the protrusion 60. It is extruded from between the outer peripheral surface of the motor housing 12 to the clearance between the outer peripheral surface of the protrusion 65 and the inner peripheral surface of the ridge 60. A part of the thermal paste 68 extruded into the clearance between the outer peripheral surface of the protrusion 65 and the inner peripheral surface of the protrusion 60 extends over the entire circumference of the outer peripheral surface of the protrusion 65. Therefore, the thermal paste 68 is in contact with the entire surface of the end surface 65a of the protrusion 65. According to this, the heat generated from the common mode choke coil 30 is transferred to the motor housing via the filter box 40 and the thermal paste 68, as compared with the case where a part of the end surface 65a of the protrusion 65 is not in contact with the thermal paste 68. Since heat is efficiently dissipated to 12, the durability of the common mode choke coil 30 can be further improved.

The above embodiment can be modified and implemented as follows. The above embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.

○ In the embodiment, the ridges 60 may not be formed on the outer peripheral surface of the peripheral wall 12b of the motor housing 12, and the ridges may be formed on the outer surface of the bottom wall 42 of the box body 41, for example. The seal member 66 is in contact with the ridge, and the outer peripheral surface of the peripheral wall 12b of the motor housing 12, the filter box 40, the ridge, and the seal member 66 form a grease storage chamber 67 in which the thermal paste 68 is housed. You may do so.

○ In the embodiment, a ridge may be formed on the outer surface of the bottom wall 42 of the box body 41. In this case, the seal member 66 is interposed between the ridge 60 formed on the outer peripheral surface of the peripheral wall 12b of the motor housing 12 and the ridge formed on the outer surface of the bottom wall 42 of the box body 41. Then, the outer peripheral surface of the peripheral wall 12b of the motor housing 12, the filter box 40, the ridges 60 formed on the outer peripheral surface of the peripheral wall 12b of the motor housing 12, the ridges formed on the outer surface of the bottom wall 42 of the box body 41, and the ridges formed on the outer surface of the bottom wall 42 of the box body 41. The sealing member 66 may form a grease housing chamber 67 in which the thermal paste 68 is housed. In short, it is sufficient that an annular ridge is formed on at least one of the outer peripheral surface of the housing 11 and the outer surface of the filter box 40.

○ In the embodiment, the box cover 51 may not be formed of a material having a higher rigidity than the box main body 41, and may be formed of, for example, the same material as the box main body 41.

○ In the embodiment, the shape of the ridge 60 is not particularly limited as long as it is annular, and may be, for example, a square annular shape.
○ In the embodiment, if the seal member 66 is annular, the shape thereof may be appropriately changed according to the shape of the ridge 60.

○ In the embodiment, the portion inside the ridge 60 on the outer peripheral surface of the peripheral wall 12b of the motor housing 12 may not be a flat surface shape, for example, a curved surface shape.
○ In the embodiment, for example, at least one of the first bypass capacitor 31, the second bypass capacitor 32, and the smoothing capacitor 33 may be arranged between the second mounting leg 22 and the fourth mounting leg 24. In this case, at least one of the first bypass capacitor 31, the second bypass capacitor 32, and the smoothing capacitor 33 is a pair of mounting legs protruding from a portion of the outer peripheral surface of the housing 11 that is separated from each other in the axial direction of the rotating shaft 15. It is a filter element arranged between the second mounting leg 22 and the fourth mounting leg 24.

○ In the embodiment, the number of capacitors 35 mounted on the filter board 34 is not particularly limited.
○ In the embodiment, each filter element may be housed not only in the filter box 40 but also in the inverter housing chamber 19.

○ In the embodiment, a part of the thermal paste 68 is formed between the end surface 65a of the protrusion 65 and the outer peripheral surface of the motor housing 12 inside the protrusion 60, and the outer peripheral surface of the protrusion 65 and the inner peripheral surface of the protrusion 60. It does not have to be extruded into the clearance between and.

○ In the embodiment, the thermal paste 68 may not be applied between the end surface 65a of the protrusion 65 and the outer peripheral surface of the motor housing 12 inside the ridge 60.
○ In the embodiment, even if two annular grooves 66a are not formed on each of the end surface of the seal member 66 in contact with the end surface 64a of the bulging portion 64 and the end surface of the seal member 66 in contact with the open end surface 60a of the ridge 60. good.

○ In the embodiment, the electric compressor 10 may have a configuration in which, for example, the electric motor 17, the compression unit 16, and the power substrate 25 are arranged side by side in the axial direction of the rotating shaft 15 in this order.

○ In the embodiment, for example, a cover may be attached to the peripheral wall 12b of the motor housing 12, and the power board 25 may be accommodated in an inverter accommodating chamber partitioned by the peripheral wall 12b of the motor housing 12 and the cover.

○ In the embodiment, the electric compressor 10 constitutes a vehicle air conditioner, but the present invention is not limited to this. For example, the electric compressor 10 is mounted on a fuel cell vehicle and is a fluid supplied to the fuel cell. The air as a fuel cell may be compressed by the compression unit 16.

Qu1, Qu2, Qv1, Qv2, Qw1, Qw2 ... Switching element, 10 ... Electric compressor, 11 ... Housing, 12 ... Motor housing, 12h ... Suction port, 15 ... Rotating shaft, 16 ... Compressor, 17 ... Electric motor, 20 ... motor control device, 21 ... first mounting leg as mounting leg, 22 ... second mounting leg as mounting leg, 23 ... third mounting leg as mounting leg, 24 ... fourth mounting leg as mounting leg, 25 ... power board, 30 ... common mode choke coil which is a filter element, 40 ... filter box, 41 ... box body, 51 ... box cover, 60 ... ridge, 66 ... seal member, 67 ... grease storage chamber, 68 ... heat dissipation grease.

Claims (2)

The axis of rotation and
A compression unit that compresses the fluid by the rotation of the rotation axis,
An electric motor that rotates the rotating shaft and
A power board on which a switching element that performs a switching operation for driving the electric motor is mounted, a motor control device having a filter element, and a motor control device.
A cylindrical housing that houses the rotating shaft, the compression unit, the electric motor, and the power substrate.
An electric compressor provided with a filter box attached to the outer peripheral surface of the housing and accommodating the filter element.
The housing has a pair of mounting legs that each project from a portion of the outer peripheral surface of the housing that is spaced apart from each other in the axial direction of the axis of rotation.
The filter box is mounted on the outer peripheral surface of the housing with the filter element arranged between the pair of mounting legs .
The housing comprises a motor housing that houses the electric motor.
The motor housing has a suction port for sucking a refrigerant as the fluid into the motor housing from the outside.
An annular ridge is formed on at least one of the outer peripheral surface of the motor housing and the outer surface of the filter box.
An annular sealing member is in contact with the ridge,
The outer peripheral surface of the motor housing, the filter box, the ridges, and the sealing member form a grease accommodating chamber for accommodating thermal paste.
The electric compressor , wherein the filter element is thermally coupled to the motor housing via the filter box and the thermal paste . The filter box is
A bottomed cylindrical box body that houses the filter element,
It has a box cover that closes the opening of the box body, and has.
The box body is arranged between the housing and the box cover.
The electric compressor according to claim 1 , wherein the box cover is made of a material having a higher rigidity than the box body.

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