JP6772934B2 - Electric compressor - Google Patents

Description

The present invention relates to an electric compressor.

As an electric compressor of this type, there is one described in Patent Document 1. This electric compressor houses a compression mechanism unit and a compression mechanism unit that compress and discharge the refrigerant sucked into the compression chamber, a motor that drives the compression mechanism unit, and a motor drive circuit unit that drives the motor. It has a housing. Then, the motor drive circuit portion is attached to the flat surface-like attachment surface formed on the outer peripheral surface of the housing.

In this electric compressor, a motor drive circuit unit is arranged in the axial direction so that an IPM (intelligent power module), which is a heat generating component, can be brought into close contact with the suction chamber for guiding the suction refrigerant to the compression chamber in the housing. As a result, the IPM, which is a heat generating component, is cooled by the suction refrigerant sucked into the compression chamber in the housing, and the temperature rise of the motor drive circuit unit is suppressed.

Japanese Unexamined Patent Publication No. 2005-256700

By the way, in such an electric compressor, the suction chamber communicating with the suction port for sucking the refrigerant in the housing and the inverter storage portion in which the motor drive circuit portion is arranged are partitioned by a partition wall, and the suction chamber is airtight. It is secured.

Further, the electrical connection between the motor arranged on the suction chamber side from the partition wall and the motor drive circuit portion for driving this motor is a connection terminal portion provided so as to close the opening arranged on the partition wall. It is done through.

Specifically, the connection terminal portion is inserted into a conductive plate arranged so as to close the opening provided in the partition wall and a hole portion penetrating the front and back surfaces of the plate, and the motor and the motor drive circuit. It has a connection terminal for interposing the connection of the above, and an insulating member for insulating between the connection terminal and the plate.

Then, the connection terminal is cooled by a relatively low temperature refrigerant sucked into the housing from the suction port to cool the motor drive circuit that generates heat.

In such an electric compressor, the connection terminals and the motor drive circuit section are rapidly cooled by the refrigerant sucked into the housing. However, when the temperature of the connection terminal is lower than the dew point temperature, dew condensation water adheres to the connection terminal exposed from the partition wall to the motor drive circuit portion side. When the condensed water adheres to the connection terminal in this way, a part of the plate is ionized and dissolved in the condensed water. As a result, the conductive condensed water is interposed between the connection terminal and the plate, which causes a problem that the connection terminal and the plate are short-circuited or insulation failure is caused.

The present invention has been made in view of the above problems, and an object of the present invention is to suppress dew condensation on the connection terminals of the connection terminal portion.

In order to achieve the above object, the invention according to claim 1 is an electric motor, which comprises a housing (30) having a suction port (31a) for sucking a refrigerant and a discharge port (32a) for discharging a refrigerant. A compression mechanism unit (10) arranged in the housing and compressing the refrigerant sucked into the operating chamber (15) from the suction port (31a) and discharging the refrigerant from the discharge port, and a compression mechanism unit arranged in the housing and compressed. A motor drive circuit (60) that drives the motor (20) to be driven, a suction chamber (40) in which the motor is arranged and the refrigerant flows, and a circuit housing (42) in which the motor drive circuit is arranged. A conductive plate (71) arranged so as to close an opening (24a) provided in a partition wall (24) for partitioning the motor, and a motor and a motor drive circuit inserted through a hole penetrating the plate. A connection terminal portion (70) having a connection terminal (72u, 72v, 72w) for connecting to each other, an insulating member (720) for insulating between the connection terminal and the plate, and the connection terminal portion The cooled portion (73, 75, 76) is arranged between the suction port and the connection terminal and cooled by the refrigerant sucked into the housing from the suction port, and the cooled portion is a hole penetrating the plate. It is a dummy terminal (73) that is inserted into the unit and is not connected to either the electric terminal of the motor or the electric terminal of the motor drive circuit, and the dummy terminal is sucked into the housing from the suction port rather than the connection terminal. It is arranged on the upstream side of the refrigerant flow of the refrigerant, is made of the same material as the connection terminal, and has the same shape as the connection terminal.

According to such a configuration, the connection terminal portion has a cooled portion (73, 75, 76) that is arranged between the suction port and the connection terminal and is cooled by the refrigerant sucked into the housing from the suction port. Since the cooled portion is cooled by the refrigerant before the connection terminal, dew condensation on the connection terminal of the connection terminal portion can be suppressed. Further, the cooled portion is made of the same material as the connection terminal and has the same shape as the connection terminal. Therefore, since the connection terminal and the component can be shared, the cost can be reduced and the assembly can be easily performed.

In addition, the reference numerals in parentheses of each means described in this column and the scope of claims indicate the correspondence with the specific means described in the embodiment described later.

It is a vertical sectional view of the electric compressor which concerns on 1st Embodiment of this invention. It is the figure which looked at the connection terminal part of 1st Embodiment from the suction chamber side from the partition wall. FIG. 3 is a sectional view taken along line III-III in FIG. It is the figure which looked at the conventional connection terminal part from the intake chamber side from the partition wall. It is the figure which looked at the connection terminal part of the 2nd Embodiment of this invention from the intake chamber side from the partition wall. It is sectional drawing of the connection terminal part of 3rd Embodiment of this invention. It is the figure which looked at the connection terminal part of 4th Embodiment of this invention from the intake chamber side from the partition wall. It is a figure which looked at the connection terminal part of 5th Embodiment of this invention from the intake chamber side from the partition wall.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each of the following embodiments, the same or equal parts are designated by the same reference numerals in the drawings.

(First Embodiment)
Hereinafter, the first embodiment of the scroll compressor 1 of the present invention will be described with reference to FIGS. 1 to 4. The scroll compressor 1 is applied to a refrigeration cycle device of an in-vehicle air conditioner. The refrigeration cycle apparatus constitutes an aculator cycle in which an aculator for storing the liquid phase refrigerant is arranged between the refrigerant inlet of the scroll compressor 1 and the refrigerant outlet of the evaporator.

The scroll compressor 1 is an electric compressor, and is a horizontal type in which a compression mechanism unit 10 for compressing a refrigerant (fluid) and an electric motor unit 20 for driving the compression mechanism unit 10 are arranged in a horizontal direction (horizontal direction). ing.

The compression mechanism unit 10 and the electric motor unit 20 are housed in the housing 30.

The housing 30 has a tubular member 31 whose axial direction is parallel to the horizontal direction, an oil separation container 32 that closes one side of the tubular member 31 in the axial direction, and a lid that closes the other side of the tubular member 31 in the axial direction. It is a closed container formed by joining members 34.

Specifically, the tubular member 31 is formed of iron in a cylindrical shape. The tubular member 31 forms a suction chamber 40 for accommodating the compression mechanism portion 10 and the electric motor portion 20, and a suction port 31a (see FIG. 3) for introducing the refrigerant flowing from the accumulator into the suction chamber 40. Further, the tubular member 31 forms an inverter storage unit 42 that stores an inverter 60 that supplies three-phase AC power to the electric motor unit 20.

The tubular member 31 has a partition wall 24 that separates the suction chamber 40 and the inverter storage portion 42. The inverter storage unit 42 corresponds to a circuit storage unit. The suction chamber 40 and the inverter storage section 42 are partitioned by the partition wall 24, and the airtightness of the inverter storage section 42 is ensured. The partition wall 24 prevents the refrigerant sucked into the suction chamber 40 from flowing into the inverter storage portion 42 side. The partition wall 24 is formed with an opening 24a (see FIG. 3) that connects the suction chamber 40 and the inverter storage portion 42, and a connection terminal portion 70 described later is arranged so as to close the opening 24a. ..

The lid member 34 is formed of resin or the like and closes an opening formed on the other side of the inverter housing portion 42 in the axial direction.

The oil separation container 32 is made of iron. The oil separation container 32 forms a refrigerant discharge port 32a and a lubricating oil separation chamber 32b communicating with the refrigerant discharge port 32a. The lubricating oil separation chamber 32b houses a lubricating oil separation mechanism 32c that separates the lubricating oil from the high-pressure refrigerant discharged from the discharge chamber, which will be described later, and guides the high-pressure refrigerant from which the lubricating oil has been separated to the refrigerant discharge port 32a. The lower side of the lubricating oil separation chamber 32b is provided with an oil storage chamber 33 for storing the lubricating oil separated by the lubricating oil separation mechanism 32c. The tubular member 31 and the oil separation container 32 are airtightly joined by bolts or the like.

The electric motor unit 20 constitutes a three-phase AC synchronous motor, and has a stator 21 forming a stator and a rotor 22 forming a rotor. The stator 21 has a substantially cylindrical shape extending in the horizontal direction as a whole, and is fixed to the tubular member 31 of the housing 30. Specifically, the stator 21 has a stator core 211 and a stator coil 212 wound around the stator core 211.

The supply of three-phase AC power to the stator coil 212 is performed from the inverter 60 via the connection terminal portion 70. The inverter 60 corresponds to a motor drive circuit. The connection terminal unit 70 connects the electric terminal of the electric motor unit 20 and the electric terminal of the inverter 60. The connection terminal portion 70 is arranged above the stator 21 in the housing 30.

FIG. 2 is a view of the connection terminal portion 70 as viewed from the suction chamber 40 side from the partition wall 24. FIG. 3 is a sectional view taken along line III-III in FIG. Note that FIG. 3 shows not only the connection terminal portion 70, but also the suction port 31a for introducing the refrigerant into the suction chamber 40 in the partition wall 24 and the tubular member 31 to which the connection terminal portion 70 is attached.

As shown in FIGS. 2 to 3, the connection terminal portion 70 has a plate 71 and a connection terminal 72. The connection terminal 72 is composed of connection terminals 72u, 72v, 72w.

The plate 71 is made of a metal member having a plate shape. Two screw holes 71a are formed in the plate 71. The plate 71 is fixed to the partition wall 24 by a screw 80 inserted into the screw hole 71a of the plate 71. The plate 71 is attached to the partition wall 24 so as to close the opening 24a provided in the partition wall 24.

Each of the connection terminals 72u, 72v, and 72w is made of a conductive metal member. The connection terminals 72u, 72v, and 72w are inserted into holes penetrating the plate 71, respectively, to connect the electric motor unit 20 as a motor and the inverter 60 to each other.

One end side of each connection terminal 72u, 72v, 72w is exposed from the partition wall 24 to the suction chamber 40 side, and is connected to each of the three three-phase AC wirings 212a extending from the stator coil 212 via the crimp terminal 213. Has been done.

The other ends of the connection terminals 72u, 72v, and 72w are exposed from the partition wall 24 to the inverter storage portion 42, and are connected to the inverter 60 via the connector 61, respectively.

Insulating members 720 are provided in the gaps between the through holes penetrating the plate 71 and the three connection terminals 72, and the plate 71 and the connection terminals 72u, 72v, and 72w are insulated by these insulating members 720.

The connection terminal portion 70 of the present embodiment further has a dummy terminal 73. The dummy terminal 73 is inserted into a hole penetrating the plate 71, and is not connected to either the electric terminal of the electric motor unit 20 or the electric terminal of the inverter 60.

The dummy terminal 73 is made of the same material as the connection terminals 72u, 72v, and 72w, and has the same shape as the connection terminals. The dummy terminal 73 is arranged on the upstream side of the refrigerant flow of the refrigerant sucked into the tubular member 31 from the suction port 31a from the connection terminals 72u, 72v, 72w. Specifically, the dummy terminal 73 is provided on the suction port 31a side of the tubular member 31 from the connection terminals 72u, 72v, 72w. The dummy terminal 73 is a cooled portion that is arranged in a flow path through which the refrigerant sucked from the suction port 31a reaches the connection terminals 72u, 72v, 72w and is cooled by the refrigerant.

Returning to the description of FIG. 1, the rotor 22 includes a permanent magnet and is arranged inside the stator 21 in the radial direction. The rotor 22 has a cylindrical shape whose axes coincide with each other in the horizontal direction, and a rotating shaft 25 extending in the horizontal direction is fixed to the center hole of the rotor 22.

The rotating shaft 25 is formed in an elongated cylindrical shape having an oil supply flow path 251 extending in the axial direction. The oil supply flow path 251 opens in the back pressure chamber 50 on one side of the rotating shaft 25 in the axial direction. The oil supply flow path 251 is an oil supply flow path that supplies lubricating oil to the bearing 27.

The other side portion of the rotating shaft 25 in the axial direction is rotatably supported by the bearing 27. The bearing 27 is fixed to the tubular member 31 of the housing 30 via the intervening member 28.

A portion of the rotating shaft 25 on one side in the axial direction with respect to the rotor 22 is rotatably supported by a bearing 291 configured in the front housing 29. The front housing 29 has a cylindrical shape in which the outer diameter and the inner diameter gradually increase from the other side in the axial direction toward one side in the axial direction, and the outermost peripheral surface thereof abuts on the tubular member 31 of the housing 30. It is fixed in the state of being fixed.

The portion of the rotating shaft 25 on one side in the axial direction with respect to the rotor 22 is located inside the front housing 29, and the portion of the front housing 29 on the other side in the axial direction having the smallest inner diameter constitutes the bearing 291. There is.

A back pressure chamber 50 is formed between the bearing 120 and the bearing 291 in the front housing 29. The back pressure chamber 50 is formed in an annular shape centered on the axis of the rotating shaft 25. As will be described later, the refrigerant discharged from the discharge chamber 124 is stored in the back pressure chamber 50, and the refrigerant pressure of the discharged refrigerant is applied to the movable scroll 11 as the back pressure.

In the back pressure chamber 50, one side of the rotating shaft 25 in the axial direction, the eccentric shaft 253, and the bush balancer 254 are housed. The eccentric shaft 253 is a shaft member that projects from one side of the rotating shaft 25 in the axial direction to one side in the axial direction. The eccentric shaft 253 is offset in the radial direction with respect to the axis of the rotating shaft 25.

The eccentric shaft 253 is fitted in the boss portion 254a of the bush balancer 254. The bush balancer 254 includes a weight portion 254b that is arranged radially outward with respect to the boss portion 254a and is connected to the boss portion 254a. The bush balancer 254 alleviates the imbalance of the rotating shaft 25 caused by the movable scroll 11.

The movable scroll 11 is arranged on one side in the axial direction with respect to the front housing 29, and constitutes a movable member of the compression mechanism portion 10. A fixed scroll 12 forming a fixing member of the compression mechanism portion 10 is arranged on one side in the axial direction with respect to the movable scroll 11.

The movable scroll 11 and the fixed scroll 12 have disc-shaped substrate portions 111 and 121. The movable scroll 11 and the fixed scroll 12 are arranged so as to face each other in the horizontal direction.

A support portion 113 that supports the bearing 120 is formed in the central portion of the movable scroll board portion 111. The boss portion 254a of the bush balancer 254 is rotatably supported by a bearing 120.

The movable scroll 11 and the front housing 29 are provided with a rotation prevention mechanism (not shown) that prevents the movable scroll 11 from rotating around the eccentric shaft 253. Therefore, when the rotation shaft 25 rotates, the movable scroll 11 revolves (turns) around the rotation center of the rotation shaft 25 without rotating around the eccentric shaft 253.

The movable scroll 11 is formed with a spiral tooth portion 112 that protrudes from the substrate portion 111 toward the fixed scroll 12 side. On the other hand, the substrate portion 121 of the fixed scroll 12 is fixed to the tubular member 31 of the housing 30, and the upper surface of the fixed scroll substrate portion 121 (the surface on the movable scroll 11 side) has the tooth portions 112 of the movable scroll 11. A spiral tooth portion 122 that meshes with each other is formed. Specifically, a spiral groove portion is formed on the upper surface of the fixed scroll substrate portion 121, and the side wall of the spiral groove portion constitutes the spiral tooth portion 122.

A plurality of crescent-shaped working chambers 15 are formed by the teeth 112 and 122 of the movable scroll 11 and the fixed scroll 12 meshing with each other and coming into contact with each other at a plurality of locations. In FIG. 1, for convenience of illustration, only one of the plurality of operating chambers 15 is designated by a reference numeral, and the other working chambers are omitted from the reference numerals.

The operating chamber 15 moves while changing the volume from the outer peripheral side to the central side by the revolving motion of the movable scroll 11. By expanding the volume of the operating chamber 15, the refrigerant flowing from the accumulator is supplied to the operating chamber 15 through the suction chamber 40 and the suction hole, and the volume of the operating chamber 15 is reduced to reduce the volume of the operating chamber 15. The refrigerant in 15 is compressed.

A discharge port 123 for discharging the refrigerant compressed in the operating chamber 15 is formed in the central portion of the fixed scroll board portion 121.

A discharge chamber 124 communicating with the discharge port 123 is formed on one side in the axial direction with respect to the fixed scroll board portion 121. The discharge chamber 124 is arranged on the opposite side in the axial direction with respect to the lubricating oil separation chamber 32b with the partition wall 33f interposed therebetween. The fixed scroll board portion 121 is formed with a passage path 121a that guides the lubricating oil from the oil storage chamber 33 to the back pressure chamber 50.

Further, the fixed scroll board portion 121 is formed with a back pressure intake port 121b that guides the refrigerant discharged from the discharge chamber 124 to the back pressure chamber 50. On the other hand, the movable scroll 11 is formed with a communication passage 11a that communicates between the back pressure intake port 121b and the back pressure chamber 50.

The discharge chamber 124 prevents the refrigerant from flowing back to the operating chamber 15 via the discharge port 123, and regulates a lead valve (not shown) that opens and closes the discharge port 123 and a maximum opening degree of the lead valve. A stopper 19 is arranged. The lead valve serves to open and close the back pressure intake port 121b.

Next, the operation of the scroll compressor 1 of the present embodiment will be described.

First, when three-phase AC power is supplied from the inverter 60 to the stator coil 212, a rotating magnetic field is applied from the stator coil 212 to the rotor 22, and a rotational force is generated in the rotor 22. Therefore, the rotating shaft 25 rotates integrally with the rotor 22. At this time, the bush balancer 254 rotates in the back pressure chamber 50 with the rotation of the rotation shaft 25.

At this time, the rotational force of the rotating shaft 25 is transmitted to the movable scroll 11 through the eccentric shaft 253. Therefore, the movable scroll 11 makes a turning motion with respect to the fixed scroll. As a result, the capacities of the plurality of working chambers 15 change. Therefore, when the refrigerant is sucked from the accumulator into the working chamber 15 of the plurality of working chambers 15 through the suction port 31a and the suction chamber 40 and the pressure of the sucked refrigerant rises, the refrigerant pressure opens the lead valve. Valve to open the discharge port 123.

At this time, the high-pressure refrigerant from the operating chamber 15 is discharged to the discharge chamber 124 through the discharge port 123 and the communication passage 11a.

Most of the refrigerant in the discharge chamber 124 flows into the lubricating oil separation chamber 32b through the refrigerant discharge port 32a. In the lubricating oil separation chamber 32b, the oil separation container 32 separates the lubricating oil from the refrigerant supplied from the discharge chamber 124, and the refrigerant from which the lubricating oil is separated flows from the refrigerant discharge port 32a to the refrigerant inlet of the condenser.

The lubricating oil separated by the oil separation container 32 flows from the oil storage chamber 33 to the back pressure chamber 50 through the passage 121a. Lubricating oil from the back pressure chamber 50 is supplied to bearings 120 and 291. In addition to this, the lubricating oil in the back pressure chamber 50 is supplied to the bearing 27 through the oil supply flow path 251 of the rotating shaft 25.

On the other hand, when the reed valve opens the discharge port 123 due to the refrigerant pressure in the operating chamber 15, the reed valve also opens the back pressure intake port 121b. At this time, among the high-pressure refrigerants discharged from the operating chamber 15 to the discharge chamber 124 through the discharge port 123, the high-pressure refrigerants other than the high-pressure refrigerant supplied to the lubricating oil separation chamber 32b are passed through the back pressure intake port 121b to the back pressure chamber 50. Is supplied to. Along with this, the pressure of the refrigerant in the back pressure chamber 50 is applied to the movable scroll 11. Therefore, the movable scroll 11 is pressed against the fixed scroll 12.

On the other hand, when the inverter 60 supplies the three-phase AC power to the stator coil 212 and the movable scroll 11 starts turning at a low temperature, it is sucked into one of the plurality of operating chambers 15. The sucked liquid-phase refrigerant is compressed in the operating chamber 15 and discharged from the operating chamber 15 as a liquid-phase refrigerant (or gas-liquid two-phase refrigerant) through the discharge port 123 to the discharge chamber 124.

Next, cooling of the inverter 60 by the refrigerant will be described. When a relatively low temperature refrigerant is sucked into the tubular member 31 from the accumulator through the suction port 31a as the movable scroll 11 turns, the refrigerant hits the connection terminals 72u, 72v, 72w and the connection terminals 72u, 72v, 72w. Cools rapidly. When the connection terminals 72u, 72v, and 72w are cooled, the inverter 60 is cooled and the temperature rise of the inverter 60 is suppressed.

When the temperature of the connection terminals 72u, 72v, 72w is lower than the dew point temperature, dew condensation water adheres to the connection terminals 72u, 72v, 72w exposed from the partition wall 24 to the inverter storage portion 42 side. When the dew condensation water adheres to the connection terminals 72u, 72v, 72w in this way, a part of the plate is ionized and dissolves in the dew condensation water. As a result, the conductive condensed water is interposed between the connection terminals 72u, 72v, 72w and the plate 71, which causes a problem that the connection terminals 72u, 72v, 72w and the plate 71 are short-circuited or cause insulation failure. Occurs.

The conventional connection terminal portion 70 shown in FIG. 4 does not have a dummy terminal 73. Therefore, among the connection terminals 72u, 72v, and 72w, the connection terminal 72w in which the refrigerant sucked into the tubular member 31 from the suction port 31a directly hits is easily cooled, and the connection terminal exposed on the inverter storage portion 42 side. Condensation water easily adheres to 72w. As described above, if dew condensation water adheres to the connection terminal 72w, there arises a problem that the connection terminal 72w and the plate 71 are short-circuited or cause insulation failure.

On the other hand, the connection terminal portion 70 of the present embodiment is provided with a dummy terminal 73 on the upstream side of the suction refrigerant flow sucked into the tubular member 31 of each connection terminal 72u, 72v, 72w. As a result, the refrigerant sucked into the tubular member 31 from the suction port 31a directly hits the dummy terminal 73. Therefore, the dummy terminal 73 is more likely to be cooled than the connection terminals 72u, 72v, and 72w by the refrigerant sucked into the tubular member 31 from the suction port 31a. Therefore, dew condensation water easily adheres to the dummy terminal 73 exposed on the inverter storage portion 42 side, and dew condensation on the connection terminals 72u, 72v, 72w can be suppressed.

As described above, the electric compressor includes a housing 30 having a suction port 31a for sucking the refrigerant and a discharge port 32a for discharging the refrigerant. Further, a compression mechanism unit 10 arranged in the housing 30 that compresses the refrigerant sucked into the operating chamber 15 from the suction port 31a and discharges the refrigerant from the discharge port, and a motor arranged in the housing to drive the compression mechanism unit. A motor drive circuit 60 for driving 20 is provided. Further, in the housing, the motor is arranged so as to close the opening 24a provided in the partition wall 24 that separates the suction chamber 40 through which the refrigerant flows and the circuit accommodating portion 42 in which the motor drive circuit is arranged. The conductive plate 71, the connection terminals 72u, 72v, 72w that are inserted into the holes that penetrate the plate 71 and connect the motor and the motor drive circuit to each other, and the insulating member 720 that insulates between the connection terminal and the plate. The connection terminal portion 70 having the above is provided. Further, the connection terminal portion has a cooled portion 73 which is arranged in a flow path where the refrigerant sucked from the suction port reaches the connection terminal and is cooled by the refrigerant.

According to such a configuration, the connection terminal portion 70 has a cooled portion 73 which is arranged between the suction port 31a and the connection terminal 72 and is cooled by the refrigerant sucked into the housing 30 from the suction port 31a. Since the cooled portion 73 is cooled by the refrigerant before the connection terminal 72, dew condensation on the connection terminal 72 of the connection terminal portion 70 can be suppressed.

The cooled portion can be configured as a dummy terminal 73 that is inserted into a hole that penetrates the plate 71 and is not connected to either the electric terminal of the motor or the electric terminal of the motor drive circuit.

Further, the cooled portion 73 is made of the same material as the connection terminal 72 and has the same shape as the connection terminal 72. Therefore, since the connection terminal 72 and the component can be shared, the cost can be reduced and the assembly can be easily performed.

(Second Embodiment)
The connection terminal portion of the electric compressor according to the second embodiment of the present invention will be described with reference to FIG. The connection terminal portion 70 of the first embodiment has a dummy terminal 73 having the same shape as the connection terminals 72u, 72v, 72w as a cooling portion.

On the other hand, the connection terminal portion 70 of the present embodiment has a protrusion 75 that protrudes from the plate 71 to both the suction chamber 40 side and the inverter storage portion 42 side as a cooled portion. The amount of protrusion from the plate 71 to the suction chamber 40 side and the amount of protrusion from the plate 71 to the inverter storage portion 42 side of the protrusion 75 are the same as the protrusion amounts of the connection terminals 72u, 72v, and 72w, respectively. The cross-sectional shape of the protrusion 75 is a semi-cylindrical shape. The protrusion 75 is made of a conductive metal member. The protrusion 75 is integrally formed with the plate 71. The protrusion 75 is not connected to the electric terminal of the motor.

Further, the protrusion 75 has an enlarged heat transfer surface 75a that increases the contact area with the refrigerant sucked into the housing 30. The radius of the cross section of the protrusion 75 is larger than the radius of each connection terminal 72u, 72v, 72w, and the surface area of the protrusion 75 is larger than, for example, the surface area of the connection terminal 72w.

The protrusion 75 is arranged on the upstream side of the refrigerant flow of the refrigerant sucked into the housing 30 from the connection terminals 72u, 72v, and 72w. The protrusion 75 of the present embodiment is made of a material having a higher thermal conductivity than each connection terminal 72.

In the present embodiment, the same effect obtained from the configuration common to the first embodiment can be obtained in the same manner as in the first embodiment.

Further, the protrusion 75 as the cooled portion has an enlarged heat transfer surface 75a having a larger heat transfer area with the refrigerant than the connection terminals 72u, 72v, 72w. That is, the protrusion 75 has a larger surface area than the connection terminals 72u, 72v, and 72w. Therefore, as compared with the case where the protrusion 75 has the same shape as the connection terminals 72u, 72v, 72w, the contact area with the refrigerant sucked into the housing 30 can be increased, and more dew condensation can occur. Can be suppressed.

Further, the protrusion 75 is made of a material having a higher thermal conductivity than each connection terminal 72. As described above, it is preferable that the protrusion 75 can be made of a material having a higher thermal conductivity than each connection terminal 72.

(Third Embodiment)
The connection terminal 70 of the electric compressor according to the third embodiment of the present invention will be described with reference to FIG. The connection terminal 70 of the electric compressor of the present embodiment has a protrusion 76 protruding from the plate 71 toward the suction chamber 40 as a cooled portion. The protrusion 76 does not protrude from the plate 71 toward the inverter storage portion 42. The protrusion 76 has a cylindrical shape and is made of a conductive metal member. The protrusion 76 is integrally formed with the plate 71.

In the present embodiment, the same effect obtained from the configuration common to the first embodiment can be obtained in the same manner as in the first embodiment.

(Fourth Embodiment)
The connection terminal 70 of the electric compressor according to the fourth embodiment of the present invention will be described with reference to FIG. The electric compressor of the present embodiment includes a cooling promotion member 77 that uniformly cools a plurality of connection terminals 72u, 72v, 72w with a refrigerant sucked into the housing 30 from the suction port 31a.

The cooling promoting member 77 comes into contact with the refrigerant sucked into the housing 30 from the suction port 31a and also comes into contact with the plurality of connection terminals 72u, 72v, 72w via the insulating member 770.

The cooling promotion member 77 is made of a plate-shaped metal member. The cooling promotion member 77 has a blade portion 77a, a main body portion 78b, and a contact portion 78c.

The blade portion 77a is arranged on the upstream side of the refrigerant flow of the refrigerant sucked into the housing 30 from the suction port 31a. Specifically, the blade portion 77a, the main body portion 78b, and the contact portion 78c are arranged on the suction port 31a side, and the main body portion 78b is arranged between the blade portion 77a and the contact portion 78c.

The contact portion 78c is provided with a plurality of through holes 780. Connection terminals 72u, 72v, and 72w are inserted through these through holes 780. The contact portion 78c is in contact with the connection terminals 72u, 72v, 72w and the plate 71 via the insulating member 770.

The refrigerant sucked into the housing 30 from the suction port 31a cools the blade portion 77a of the cooling promotion member 77. As a result, the main body portion 78b and the contact portion 78c are cooled, and the connection terminals 72u, 72v, and 72w are uniformly cooled via the insulating member 720.

As described above, the electric compressor includes a housing 30 having a suction port 31a for sucking the refrigerant and a discharge port 32a for discharging the refrigerant. Further, a compression mechanism unit 10 arranged in the housing 30 that compresses the refrigerant sucked into the operating chamber 15 from the suction port 31a and discharges the refrigerant from the discharge port, and a motor arranged in the housing to drive the compression mechanism unit. A motor drive circuit 60 for driving 20 is provided. Further, in the housing, the motor is arranged so as to close the opening 24a provided in the partition wall 24 that separates the suction chamber 40 through which the refrigerant flows and the circuit accommodating portion 42 in which the motor drive circuit is arranged. A plurality of connection terminals 72u, 72v, 72w, and connection terminals 72u, 72v, 72w and the plate 71, which are inserted into a conductive plate 71 and a hole penetrating the plate 71 to connect the motor and the motor drive circuit to each other. It is provided with an insulating member 770 that insulates between the two, and a connection terminal portion 70 having the same. Further, a cooling promoting member 77 is provided which uniformly cools the plurality of connection terminals 72u, 72v, and 72w by the refrigerant sucked into the housing 30 from the suction port 31a.

According to such a configuration, the plurality of connection terminals 72u, 72v, 72w are uniformly cooled by the refrigerant sucked into the housing 30 from the suction port 31a, and only specific connection terminals are intensively cooled. Is prevented, so that dew condensation on the connection terminal of the connection terminal portion can be suppressed.

Further, the cooling promotion member can be composed of a plate-shaped member 77 that contacts the refrigerant sucked into the housing 30 from the suction port 31a and also contacts the plurality of connection terminals 72 via the insulating member 770.

(Fifth Embodiment)
The connection terminal 70 of the electric compressor according to the fifth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, the cooling promoting member 77 is formed by a plate-shaped member 77 that contacts the refrigerant sucked into the housing 30 from the suction port 31a and also contacts the plurality of connection terminals 72u, 72v, 72w via the insulating member 780. Was configured. On the other hand, in the present embodiment, the cooling promotion member 78 is configured by the duct 78 that guides the refrigerant sucked into the housing 30 from the suction port 31a to the plurality of connection terminals 72u, 72v, 72w.

The duct 78 has a refrigerant introducing portion 78a, a refrigerant guiding portion 78b, and a refrigerant blowing portion 78c. The refrigerant introducing portion 78a, the refrigerant guiding portion 78b, and the refrigerant blowing portion 78c are integrally formed by using a metal material.

The refrigerant sucked into the housing 30 from the suction port 31a is introduced into the refrigerant blowing portion 78c. The refrigerant introduced into the refrigerant blowing section 78c is guided to the refrigerant blowing section 78c through the refrigerant guiding section 78b, and then discharged from the plurality of connection terminals 72u, 72v, 72w in the refrigerant blowing section 78c.

According to such a configuration, the plurality of connection terminals 72u, 72v, 72w are uniformly cooled by the refrigerant sucked into the duct 78 from the refrigerant introduction portion 78a, and only specific connection terminals are intensively cooled. Since this is prevented, dew condensation on the connection terminal of the connection terminal portion can be suppressed.

In the present embodiment, the same effect obtained from the configuration common to the fourth embodiment can be obtained in the same manner as in the first embodiment.

(Other embodiments)
(1) In each of the above embodiments, an example in which the scroll compressor 1 is applied to the in-vehicle air conditioner has been described, but the present invention is not limited to this, and the scroll compressor 1 is applied to various air conditioners such as building air conditioners and residential air conditioners. It may be applied.

(2) In each of the above embodiments, an example in which the scroll compressor 1 of the present invention is applied to an accumulator cycle has been described, but instead, the present invention is applied to a receiver cycle in which a receiver is arranged between a capacitor and a pressure reducing valve. Scroll compressor 1 may be applied. Alternatively, the scroll compressor 1 of the present invention may be applied to various refrigeration cycles in which the cooling operation and the heating operation can be switched even in a refrigeration cycle other than the accumulator cycle and the receiver cycle.

The present invention is not limited to the above-described embodiment, and can be appropriately modified within the scope of the claims. Further, the above-described embodiments are not unrelated to each other, and can be appropriately combined unless the combination is clearly impossible. Further, in each of the above embodiments, it goes without saying that the elements constituting the embodiment are not necessarily essential except when it is clearly stated that they are essential and when they are clearly considered to be essential in principle. No. Further, in each of the above embodiments, when numerical values such as the number, numerical values, amounts, and ranges of the constituent elements of the embodiment are mentioned, when it is clearly stated that they are particularly essential, and in principle, the number is clearly limited to a specific number. It is not limited to the specific number except when it is done. Further, in each of the above embodiments, when referring to the material, shape, positional relationship, etc. of the constituent elements, etc., except when specifically specified or when the material, shape, positional relationship, etc. are limited in principle. , The material, shape, positional relationship, etc. are not limited.

(Summary)
According to the first aspect shown in part or all of the above embodiments, the housing includes a suction port for sucking the refrigerant and a discharge port for discharging the refrigerant. Further, a compression mechanism unit that is arranged in the housing and compresses the refrigerant sucked into the operating chamber from the suction port and discharges the refrigerant from the discharge port, and a motor drive that is arranged in the housing and drives the motor that drives the compression mechanism unit. It has a circuit. Further, in the housing, a conductive plate arranged so as to close an opening provided in a partition wall that separates a suction chamber in which a motor is arranged and a refrigerant flows and a circuit accommodating portion in which a motor drive circuit is arranged. And a connection terminal portion having a connection terminal inserted into a hole portion penetrating the plate and connecting the motor and the motor drive circuit to each other, and an insulating member that insulates between the connection terminal and the plate. There is. Further, the connection terminal portion has a cooled portion that is arranged in a flow path through which the refrigerant sucked from the suction port reaches the connection terminal and is cooled by the refrigerant.

Further, according to the second viewpoint, the cooled portion is a dummy terminal that is inserted into a hole penetrating the plate and is not connected to either the electric terminal of the motor or the electric terminal of the motor drive circuit. The dummy terminal is arranged on the upstream side of the refrigerant flow of the refrigerant sucked into the housing from the suction port from the connection terminal.

In this way, the cooled portion can be configured as a dummy terminal that is inserted into a hole that penetrates the plate and is not connected to either the electric terminal of the motor or the electric terminal of the motor drive circuit.

Further, according to the third viewpoint, the dummy terminal is made of the same material as the connection terminal and has the same shape as the connection terminal. Therefore, since the connection terminal and the component can be shared, the cost can be reduced and the assembly can be easily performed.

Further, according to the fifth aspect, the protrusion has an enlarged heat transfer surface having a larger contact area with the refrigerant than the connection terminal. Therefore, as compared with the case where the protrusions have the same shape as each connection terminal, the contact area with the refrigerant sucked into the housing can be increased, and the occurrence of dew condensation can be further suppressed. it can.

Further, according to the sixth viewpoint, the cooled portion is made of a material having a higher thermal conductivity than the connection terminal. As described above, the cooled portion is preferably made of a material having a higher thermal conductivity than the connection terminal.

Further, according to the seventh aspect, the cooled portion is formed integrally with the plate. Therefore, the connection terminal portion can be easily assembled.

According to the eighth aspect shown in a part or all of the above embodiments, the housing includes a suction port 31a for sucking the refrigerant and a discharge port for discharging the refrigerant. Further, a compression mechanism unit that is arranged in the housing and compresses the refrigerant sucked into the operating chamber from the suction port and discharges the refrigerant from the discharge port, and a motor that is arranged in the housing and drives the motor 20 that drives the compression mechanism unit. It is equipped with a drive circuit. Further, in the housing, a conductive plate arranged so as to close an opening provided in a partition wall that separates a suction chamber in which a motor is arranged and a refrigerant flows and a circuit accommodating portion in which a motor drive circuit is arranged. And a connection terminal portion having a plurality of connection terminals inserted into a hole portion penetrating the plate and connecting the motor and the motor drive circuit to each other, and an insulating member that insulates between the connection terminal and the plate. I have. Further, it is provided with a cooling promoting member that uniformly cools a plurality of connection terminals by the refrigerant sucked into the housing from the suction port.

Further, according to the ninth aspect, the cooling promotion member is composed of a plate-shaped member that comes into contact with the refrigerant sucked into the housing from the suction port and also comes into contact with a plurality of connection terminals via the insulating member.

As described above, the cooling promotion member can be composed of a plate-shaped member that comes into contact with the refrigerant sucked into the housing from the suction port and also comes into contact with a plurality of connection terminals via the insulating member.

Further, according to the tenth viewpoint, the cooling promotion member is composed of a duct that guides the refrigerant sucked into the housing from the suction port to a plurality of connection terminals. As described above, the cooling promotion member can be composed of a duct that guides the refrigerant sucked into the housing from the suction port to a plurality of connection terminals.

1 Compressor 10 Compression mechanism 24 Partition wall 20 Motor 30 Housing 31a Suction port 32a Discharge port 70 Suction chamber 60 Motor drive circuit 70 Connection terminal 71 Plate 72 Connection terminal 720 Insulation member

Claims (1)

It ’s an electric compressor,
A housing (30) having a suction port (31a) for sucking the refrigerant and a discharge port (32a) for discharging the refrigerant, and a refrigerant arranged in the housing and sucked into the operating chamber (15) from the suction port. And the compression mechanism unit (10) that compresses and discharges from the discharge port.
A motor drive circuit (60) that is arranged in the housing and drives a motor (20) that drives the compression mechanism unit,
In the housing, an opening provided in a partition wall (24) that separates the suction chamber (40) in which the motor is arranged and the refrigerant flows and the circuit accommodating portion (42) in which the motor drive circuit is arranged. A conductive plate (71) arranged so as to close (24a) and a connection terminal (72u, 72u, which is inserted through a hole penetrating the plate and for connecting the motor and the motor drive circuit to each other. 72v, 72w), and a connection terminal portion (70) having an insulating member (720) that insulates between the connection terminal and the plate.
The connection terminal portion has a cooled portion (73, 75, 76) that is arranged between the suction port and the connection terminal and is cooled by the refrigerant sucked into the housing from the suction port .
The cooled portion is a dummy terminal (73) that is inserted into a hole that penetrates the plate and is not connected to either the electric terminal of the motor or the electric terminal of the motor drive circuit.
The dummy terminal is arranged on the upstream side of the refrigerant flow of the refrigerant sucked into the housing from the suction port from the connection terminal, is made of the same material as the connection terminal, and has the same shape as the connection terminal. and electric compressor has.

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