JP2020122449A - Electric compressor - Google Patents

Abstract

To inhibit a filter element from being affected by external force due to a collision.SOLUTION: A filter box 40 is mounted to an outer peripheral surface of a motor housing 12 in a state where a common mode choke coil 30 serving as a filter element is disposed between a second mounting leg 22 and a fourth mounting leg 24 which are a pair of mounting legs. In this configuration, as the second mounting leg 22 and the fourth mounting leg 24 are arranged on both sides in the axial direction of a rotating shaft 15 with respect to the common mode choke coil 30, the common mode choke coil 30 is protected by the second mounting leg 22 and the fourth mounting leg 24 from both sides in the axial direction of the rotating shaft 15. Therefore, the common mode choke coil 30 is prevented from being affected by external force due to the collision of a vehicle.SELECTED DRAWING: Figure 2

Description

The present invention relates to an electric compressor.

The electric compressor includes a cylindrical housing, and a housing includes a rotating shaft, a compression unit that compresses fluid by rotation of the rotating shaft, and an electric motor that rotates the rotating shaft. Further, the electric compressor includes a motor control device that drives an electric motor. The motor control device includes 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 disclosed in Patent Document 1, a power board is housed in an inverter housing formed inside 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 that houses the power substrate and a portion that houses the filter element are provided separately.

JP, 2009-275606, A

By the way, in an electric compressor handling a large current, a 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 housing the filter element is growing. Since the filter box is attached to the outer peripheral surface of the housing, when the filter box becomes large, for example, when the 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 is generated. However, the filter element is likely 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 stored in the capacitor which is a part of the filter element, it is required that the capacitor is not affected by external force due to collision.

The present invention has been made to solve the above problems, and an object thereof is to provide an electric compressor capable of suppressing the filter element from being affected by an external force due to a collision. is there.

An electric compressor that solves the above problems performs a rotating shaft, a compression unit that compresses a fluid by rotation of the rotating shaft, an electric motor that rotates the rotating shaft, and a switching operation to drive the electric motor. A motor control device having a power board on which a switching element is mounted and a filter element, a tubular housing that houses the rotary shaft, the compression unit, the electric motor, and the power board, and an outer peripheral surface of the housing. An electric compressor provided with a filter box that is mounted and houses the filter element, wherein the housing has a pair of protrusions respectively projecting from portions of the outer peripheral surface of the housing that are separated from each other in the axial direction of the rotating shaft. The filter box has mounting legs, and the filter box is mounted on the outer peripheral surface of the housing in a state in which the filter element is disposed between the pair of mounting legs.

According to this, since the pair of mounting legs are arranged on both sides of the filter element in the axial direction of the rotating shaft, the pair of mounting legs protects the filter element from both sides of the rotating shaft in the axial direction. You can Therefore, it is possible to prevent the filter element from being affected by the external force due to the collision.

In the electric compressor, the housing includes a motor housing that accommodates the electric motor, and the motor housing has a suction port for sucking a refrigerant as the fluid from the outside into the motor housing, An annular protrusion is formed on at least one of the outer peripheral surface of the motor housing and the outer surface of the filter box, and an annular seal member is in contact with the protrusion, and the outer peripheral surface of the motor housing, The filter box, the protrusion, and the seal member form a grease storage chamber for storing heat dissipation grease, and the filter element is thermally coupled to the motor housing via the filter box and the heat dissipation grease. Be connected to.

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

In the electric compressor, the filter box has a bottomed tubular box body that houses the filter element, and a box cover that closes an opening of the box body, and the box body is the housing. The box cover is disposed between the box cover and the box cover, and the box cover is preferably made of a material having higher rigidity than the box body.

According to this, since the box cover made of a material having higher rigidity than the box body is arranged on the side opposite to the housing with respect to the filter element, the box cover prevents the filter element from the side opposite to the housing. The element can be protected. Therefore, it is possible to further suppress the filter element from being 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 showing the electric compressor in an embodiment. The sectional side view of an electric compressor. The circuit diagram which shows the electric constitution of an electric compressor. The exploded perspective view of a filter box. The disassembled perspective view of a box main body and a filter substrate. The disassembled perspective view of an electric compressor. The partial cross section figure of an electric compressor.

An embodiment in which the electric compressor is embodied will be described below with reference to FIGS. The electric compressor of this embodiment is used, for example, in a vehicle air conditioner. The electric compressor is arranged in the engine room of the vehicle.

As shown in FIG. 1, the housing 11 of the electric compressor 10 has a tubular shape. The housing 11 includes 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 tubular shape from the outer peripheral edge of the bottom wall 12a. The discharge housing 13 is connected to an end 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 that is a fluid by the rotation of the rotary shaft 15, and an electric motor 17 that rotates the rotary shaft 15. The rotary shaft 15, the compression unit 16, and the electric motor 17 are housed in the motor housing 12. The rotating 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 rotary shaft 15. The compression unit 16 is, for example, a scroll type configured by a fixed scroll (not shown) fixed in the motor housing 12, and a movable scroll (not shown) arranged so as to face 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. When the coil 18 is supplied with electric power, the rotor 17a and the rotating shaft 15 rotate.

A suction port 12h is formed on the peripheral wall 12b of the motor housing 12. Further, the discharge housing 13 is formed with a discharge port 13h. 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 also discharged to the external refrigerant circuit via the discharge port 13h, passes through the heat exchanger and the expansion valve of the external refrigerant circuit, and then passes through the suction port 12h. Is recirculated into the motor housing 12. The electric compressor 10 and the external refrigerant circuit form a vehicle air conditioner.

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

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 rotary shaft 15 in the radial direction with the rotary shaft 15 interposed therebetween. The first mounting leg 21 is located on the outer peripheral surface of the motor housing 12 near the bottom wall 12a of the motor housing 12 and on the opposite side of the bottom wall 12a of the motor housing 12 from the extended wall 12c. It projects outward. The second mounting leg 22 projects outward from a portion of the outer peripheral surface of the motor housing 12 that is 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 extended 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 rotary shaft 15 when the electric compressor 10 is viewed from the axial direction of the rotary 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 respectively positioned on both sides of the rotary shaft 15 in the radial direction with the axis of the rotary 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 rotary shaft 15 when the electric compressor 10 is viewed from the axial direction of the rotary shaft 15. ..

The first mounting leg 21 and the third mounting leg 23 are arranged at positions facing each other in the axial direction of the rotary shaft 15. Therefore, the first mounting leg 21 and the third mounting leg 23 are a pair of mounting legs that respectively project from 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. Further, the second mounting leg 22 and the fourth mounting leg 24 are arranged at positions facing each other in the axial direction of the rotary shaft 15. Therefore, the second mounting leg 22 and the fourth mounting leg 24 are a pair of mounting legs that respectively project from 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. Therefore, in the present embodiment, the housing 11 has two pairs of mounting legs that respectively project from 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. In the electric compressor 10 of the present embodiment, the bolts (not shown) passing through the first mounting leg 21, the second mounting leg 22, the third mounting leg 23, and the fourth mounting leg 24 are, for example, the body of the vehicle. 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 an 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 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, Dw2 are connected to the plurality of switching elements Qu1, Qu2, Qv1, Qv2, Qw1, 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, 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, Qw2 are electrically connected to the negative electrode of the DC power supply 27 via the second connection line EL2. The emitters of the switching elements Qu1, Qv1, Qw1 and the collectors of the switching elements 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. Connected to each other. The switching elements Qu1, Qu2, Qv1, Qv2, Qw1, Qw2 are 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 with 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 performs on/off control of the switching elements Qu1, Qu2, Qv1, Qv2, Qw1, Qw2 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 as a drive voltage to the electric motor 17 to control the driving 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 receiving information about the target rotation speed of the electric motor 17 from the air conditioning ECU 28, the control computer 26 rotates the electric motor 17 at the target rotation speed.

The motor control device 20 also includes a filter substrate 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. An intermediate point between the other end of the first bypass capacitor 31 and one end of the second bypass capacitor 32 is grounded to the body of the vehicle, for example.

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 currents in the same direction flow in the first connection line EL1 and the second connection line EL2. Common mode noise may occur when the electric compressor 10 and the DC power supply 27 are electrically connected to each other via a route 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 rotary 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 board 25 are arranged in this order in the axial direction of the rotating shaft 15.

The electric compressor 10 includes a filter box 40 that accommodates the filter substrate 34. Therefore, the filter box 40 houses 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 the portion that houses the power board 25 and the portion that houses the filter board 34 are provided separately. 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 tubular box body 41 that houses a filter substrate 34. The flat box cover 51 closes the opening of the box body 41. The box body 41 is made of aluminum, for example. The box cover 51 is made of iron, for example. Therefore, the box cover 51 is formed 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 that is erected from the outer peripheral portion of the bottom wall 42. A coil housing recess 42a and a plurality of capacitor housing recesses 42b are formed on the inner surface of the bottom wall 42. The plurality of capacitor housing recesses 42b are arranged around the coil housing recess 42a. The common mode choke coil 30 is housed in the coil housing recess 42a. Each capacitor accommodating recess 42b accommodates each capacitor 35 that is mounted on the filter substrate 34 and that constitutes the first bypass capacitor 31, the second bypass capacitor 32, and the smoothing capacitor 33. Therefore, the plurality of capacitors 35 are mounted on the filter substrate 34.

As shown in FIG. 5, potting resin 36 is applied to each of the coil housing recess 42a and each capacitor housing recess 42b. The common mode choke coil 30 and each capacitor 35 are housed in a state of being fixed to the coil housing recess 42a and each capacitor housing recess 42b via each 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. On the first terminal block 44, a pair of columnar male screw portions 44a are provided so as to project. Further, the first terminal block 44 has 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 first terminal block mounting female screw hole 42e into which the first terminal block mounting screw 44b is screwed is formed. Then, the first terminal block 44 is mounted on the inner surface of the bottom wall 42 by screwing the first terminal block mounting screw 44b inserted through the first terminal block insertion hole 44h into the first terminal block mounting female screw hole 42e. Has been. In the state where the first terminal block 44 is attached to the inner surface of the bottom wall 42, the pair of male screw parts 44 a extend toward the opening of the box body 41.

On the second terminal block 45, a pair of columnar male screw portions 45 a is provided so as to project. The second terminal block 45 has 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. Then, the second terminal block 45 is mounted on the inner surface of the bottom wall 42 by screwing the second terminal block mounting screw 45b inserted through the second terminal block insertion hole 45h into the second terminal block mounting female screw hole 42f. Has been. When the second terminal block 45 is attached to the inner surface of the bottom wall 42, the pair of male screw parts 45 a extend toward the opening of the box body 41.

As shown in FIG. 5, the inner surface of the bottom wall 42 is provided with four cylindrical boss portions 42 g. 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 board 34 is formed with board screw insertion holes 34h through which board mounting screws 46 screwed into the respective boss portions 42g are inserted.

The filter substrate 34 has a pair of thin plate-shaped first connection terminals 34 a that are respectively connected to the male screw portions 44 a of the first terminal block 44. Each first connection terminal 34a has a hole 341a into which each male screw portion 44a is inserted. Further, the filter substrate 34 has a pair of thin plate-shaped second connection terminals 34 b that are respectively connected to the male screw portions 45 a of the second terminal block 45. Each second connection terminal 34b has a hole 341b into 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 the male screw portions 44a of the first terminal block 44 are provided. Each harness terminal 47a has a hole 471a into which each male screw 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 holes 43a, and the male screw portions 44a are inserted into the holes 471a of the harness terminals 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. By connecting the connector connecting portion 47b of the wire harness 47 to the connector connecting portion 47b of the inverter cover 14, 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 substrate 34 and the DC power supply 27. The external connector 48 has a pair of thin plate-shaped connector terminals 48a connected to the male screw portions 45a of the second terminal block 45, respectively. Each connector terminal 48a has a hole 481a into which each male screw portion 45a is inserted. A second connector insertion hole 42h is formed in the bottom wall 42. The pair of connector terminals 48a is inserted into the box body 41 via the second connector insertion hole 42h, and the male screw portions 45a are inserted into the holes 481a of the connector terminals 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 into which the bolts 48c are respectively inserted. The external connector 48 is attached to the box body 41 by screwing the bolts 48c inserted into the insertion holes 48h into the box body 41.

As shown in FIG. 5, between the harness terminals 47a and the first connection terminals 34a of the filter substrate 34, the male screw portions 44a are inserted into the holes 471a of the harness terminals 47a and the holes 341a of the first connection terminals 34a. In this state, the first nuts 49a are electrically connected by being screwed into the male screw portions 44a, respectively. In addition, each connector terminal 48a and each second connection terminal 34b of the filter substrate 34 are connected to each other in the state where each male screw portion 45a is inserted into the hole 481a of each connector terminal 48a and the hole 341b of each second connection terminal 34b. The second nut 49b is electrically connected by being screwed into each male screw portion 45a.

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

As shown in FIG. 4, a plurality of female screw holes 43h are formed in the open end surface of the peripheral wall 43 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 has an annular shape extending along the open end surface of the peripheral wall 43. The gasket 50 has a plurality of bolt insertion holes 50h through which the fastening bolts 52 are inserted. Further, the box cover 51 is formed with a bolt insertion hole 51h into which the fastening bolt 52 is inserted. Then, in the box cover 51, in the state where the gasket 50 is arranged between the box cover 51 and the opening end surface of the peripheral wall 43, the fastening bolts 52 passing through the bolt insertion holes 51h of the box cover 51 and the bolt insertion holes 50h of the gasket 50 are attached. It is attached to the box body 41 by being screwed into each female screw hole 43h, and the opening of the box body 41 is closed.

As shown in FIG. 6, an annular protrusion 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. A portion inside the protrusion 60 on the outer peripheral surface of the peripheral wall 12b of the motor housing 12 has a flat surface shape. Further, four boss portions 61 are provided so as to project around the protrusion 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, bolt mounting pedestals 63 each having a bolt insertion hole 63h through which a bolt 62 screwed into each boss portion 61 is inserted are provided in a protruding manner.

As shown in FIGS. 6 and 7, the filter box 40 has a cylindrical 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 because the coil housing recess 42a is formed on the inner surface of the bottom wall 42. An end surface 64a of the bulging portion 64 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 64 a of the bulging portion 64. An end surface 65a of the protruding portion 65 on the side opposite to the bulging portion 64 has a flat surface shape. The outer diameter of the protrusion 65 is smaller than the inner diameter of the ridge 60. The protruding portion 65 is inserted inside the protrusion 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 opening end surface 60a of the protrusion 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 bolts 62 inserted into the bolt insertion holes 63h into the boss portions 61.

As shown in FIG. 2, when 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 disposed between the second mounting leg 22 and the fourth mounting leg 24. There is. Therefore, the common mode choke coil 30 is provided between the second mounting leg 22 and the fourth mounting leg 24, which are a pair of mounting legs that respectively project from 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 seal 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. A grease accommodating chamber 67 is formed by the outer peripheral surface of the motor housing 12, the filter box 40, the protrusion 60, and the seal member 66. Two annular grooves 66a are formed on each of the end surface of the seal member 66 that contacts the end surface 64a of the bulging portion 64 and the end surface of the seal member 66 that contacts the open end surface 60a of the protrusion 60. The two annular grooves 66a function as a labyrinth seal. Therefore, the seal member 66 seals the inside and outside of the grease accommodating chamber 67.

A heat dissipation grease 68 is housed in the grease housing chamber 67. Specifically, the heat dissipation grease 68 is applied between the end surface 65 a of the protrusion 65 and the outer peripheral surface of the motor housing 12 inside the protrusion 60. A part of the heat dissipation grease 68 applied between the end surface 65 a of the projecting portion 65 and the outer peripheral surface of the motor housing 12 inside the protrusion 60 is part of the motor housing 12 inside the end surface 65 a of the projecting portion 65 and the protrusion 60. Is extruded into the clearance between the outer peripheral surface of the projecting portion 65 and the inner peripheral surface of the protrusion 60 from the outer peripheral surface thereof. A part of the heat dissipation grease 68 extruded in 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 heat dissipation grease 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 heat dissipation grease 68. The amount of the heat dissipation grease 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 heat dissipation grease 68 protrudes from the end surface 65a of the protrusion 65. The amount is set so as to be extruded into the clearance between the outer peripheral surface of the motor housing 12 inside the strip 60 and the outer peripheral surface of the protrusion 65 and the inner peripheral surface of the protrusion 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, the common mode choke coil 30 is a large component, so that 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 leg 22 and the fourth mounting leg 24 are arranged on both sides of the common mode choke coil 30 in the axial direction of the rotating shaft 15, 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 in the axial direction of the rotating shaft 15.

Further, the box cover 51 is formed of a material having higher rigidity than the box body 41. Therefore, since the box cover 51 formed of a material having 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 prevents the motor housing 12 from moving. 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 heat dissipation grease 68, the heat generated from the common mode choke coil 30 is generated by the filter box 40 and the heat dissipation grease 68. The heat is efficiently radiated to the motor housing 12 via the.

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

(2) The common mode choke coil 30 is thermally coupled to the motor housing 12 via the filter box 40 and the heat dissipation grease 68. According to this, the heat generated from the common mode choke coil 30 is efficiently radiated to the motor housing 12 via the filter box 40 and the heat dissipation grease 68, so that the durability of the common mode choke coil 30 can be improved. it can. Particularly, in the configuration in which the suction port 12h is formed in the motor housing 12, since the low-temperature suction refrigerant is inside the motor housing 12, the heat is radiated more efficiently.

(3) The box cover 51 is made of a material having higher rigidity than the box body 41. According to this, since the box cover 51 formed of a material having 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 prevents 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 the common mode choke coil 30 from being affected by the external force due to the collision.

(4) A part of the heat dissipation grease 68 applied between the end face 65 a of the protrusion 65 and the outer peripheral surface of the motor housing 12 inside the protrusion 60 is covered by the end face 65 a of the protrusion 65 and the inside of the protrusion 60. It is extruded into the clearance between the outer peripheral surface of the motor housing 12 and the outer peripheral surface of the protruding portion 65 and the inner peripheral surface of the protrusion 60. A part of the heat dissipation grease 68 extruded in 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 heat dissipation grease 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 causes the heat generated from the common mode choke coil 30 to pass through the filter box 40 and the heat dissipation grease 68, as compared with the case where a part of the end surface 65 a of the protrusion 65 does not contact the heat dissipation grease 68. Since the heat is efficiently radiated 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 modifications can be implemented in combination with each other within a technically consistent range.

In the embodiment, the protrusion 60 may not be formed on the outer peripheral surface of the peripheral wall 12b of the motor housing 12, and for example, the protrusion may be formed on the outer surface of the bottom wall 42 of the box body 41. 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 accommodating chamber 67 in which the heat dissipation grease 68 is accommodated. You may do it.

In the embodiment, a protrusion 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 protrusion 60 formed on the outer peripheral surface of the peripheral wall 12b of the motor housing 12 and the protrusion 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 ridge 60 formed on the outer peripheral surface of the peripheral wall 12b of the motor housing 12, the ridge formed on the outer surface of the bottom wall 42 of the box body 41, and The seal member 66 may form a grease storage chamber 67 in which the heat dissipation grease 68 is stored. In short, it is sufficient that the annular protrusion 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 does not have to be formed of a material having higher rigidity than the box body 41, and may be formed of the same material as the box body 41, for example.

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

In the embodiment, the portion inside the protrusion 60 on the outer peripheral surface of the peripheral wall 12b of the motor housing 12 does not have to have a flat surface shape, and may have, 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 that respectively project from 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. 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 substrate 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 heat dissipation grease 68 is provided 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 in the clearance between.

In the embodiment, the heat dissipation grease 68 does not have to be applied between the end surface 65a of the protrusion 65 and the outer peripheral surface of the motor housing 12 inside the protrusion 60.
In the embodiment, even if the two annular grooves 66a are not formed on the end surface of the seal member 66 that contacts the end surface 64a of the bulging portion 64 and the end surface of the seal member 66 that contacts the opening end surface 60a of the protrusion 60, respectively. Good.

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

In the embodiment, for example, the cover may be attached to the peripheral wall 12b of the motor housing 12, and the power board 25 may be accommodated in the inverter accommodating chamber defined 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 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... Compression section, 17... Electric motor, 20... Motor control device, 21... 1st mounting leg as mounting leg, 22... 2nd mounting leg as mounting leg, 23... 3rd mounting leg as mounting leg, 24... 4th mounting leg as mounting leg, 25... Power substrate, 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 accommodating chamber, 68... Heat dissipation grease.

Claims (3)

A rotation axis,
A compression unit that compresses a fluid by rotation of the rotating shaft,
An electric motor for rotating the rotating shaft,
A motor control device having a power substrate on which a switching element that performs a switching operation for driving the electric motor is mounted;
A tubular housing that houses the rotary shaft, the compression unit, the electric motor, and the power board;
An electric compressor provided with a filter box mounted on the outer peripheral surface of the housing and containing the filter element,
The housing has a pair of mounting legs that respectively project from portions of the outer peripheral surface of the housing that are separated from each other in the axial direction of the rotating shaft,
The electric compressor, wherein the filter box is attached to the outer peripheral surface of the housing in a state where the filter element is arranged between the pair of attachment legs. The housing includes a motor housing that houses the electric motor,
The motor housing has a suction port for sucking a refrigerant as the fluid from the outside into the motor housing,
An annular protrusion 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 seal member is in contact with the ridge,
The outer peripheral surface of the motor housing, the filter box, the protrusion, and the sealing member form a grease accommodating chamber for accommodating heat dissipation grease,
The electric compressor according to claim 1, wherein the filter element is thermally coupled to the motor housing through the filter box and the heat dissipation grease. The filter box is
A box-shaped box body having a bottom and containing the filter element,
A box cover for closing the opening of the box body,
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 higher rigidity than the box body.