JP2023124528A - electric compressor - Google Patents

Abstract

To preferably achieve the cooling of a heating element and the avoidance of short circuit through an electrolyte between lead portions.SOLUTION: In an inverter chamber 19, a shield wall 44 located so as to shield between an explosion valve 33a and a plurality of lead portions 38 is provided. The shield wall 44 includes at least a resin portion 45 thermally connects an end wall 13a of a motor housing 13 and a shunt resistance 32. Therefore, heat generated from the shunt resistance 32 is transmitted to the end wall 13a of the motor housing 13 through the resin portion 45, and thus the heat is radiated to a housing 11. Even if the explosion valve 33a is opened to scatter an electrolyte 35 in a capacitor 33 to the outside of the capacitor 33, the electrolyte 35 toward the plurality of lead portions 38 is dammed by the shield wall 44 including at least the resin portion 45.SELECTED DRAWING: Figure 4

Description

The present invention relates to an electric compressor.

For example, as disclosed in Patent Literature 1, an electric compressor includes a compressing section, an electric motor, and an inverter. The compression section compresses the fluid. The electric motor drives the compression section. The inverter drives the electric motor. The inverter has a circuit board. The electric compressor has a housing. The housing has a motor room and an inverter room. A motor room accommodates an electric motor. An inverter room accommodates an inverter. Moreover, the housing has a partition separating the motor chamber and the inverter chamber. A heating element, a capacitor, and a switching element are mounted on the circuit board. The heating element generates heat as the electric motor is driven. The switching element has a plurality of leads electrically connected to the circuit board.

JP 2015-40538 A

By the way, the capacitor may have an explosion-proof valve. An electrolytic solution is sealed inside the capacitor having an explosion-proof valve. The explosion-proof valve serves as a spout for electrolyte inside the capacitor. In such a capacitor, when the electrolyte inside the capacitor evaporates, the pressure inside the capacitor increases. The explosion-proof valve is configured to open when the pressure inside the capacitor rises above a specified value.

When the explosion-proof valve opens, the electrolytic solution inside the capacitor is scattered outside the capacitor. At this time, if the electrolytic solution scattered from the capacitor adheres to, for example, each lead portion of the switching element, the lead portions may be short-circuited through the electrolytic solution.

It is also desired to cool the heating elements. Therefore, it is desired to suitably achieve both cooling of the heating element and avoidance of short circuit between the lead portions via the electrolytic solution.

An electric compressor that solves the above problems includes a compression section that compresses a fluid, an electric motor that drives the compression section, an inverter that drives the electric motor and has a circuit board, and a motor chamber that houses the electric motor. and a housing having an inverter chamber for accommodating the inverter, the housing having a partition separating the motor chamber and the inverter chamber, and the circuit board having a drive circuit board for driving the electric motor. An electric compressor mounted with a heating element that generates heat, a capacitor having an explosion-proof valve serving as an internal electrolyte ejection port, and a switching element having a plurality of lead portions electrically connected to the circuit board. wherein the heating element is positioned between the capacitor and the switching element on the circuit board, and the inverter chamber includes a space between the explosion-proof valve and the plurality of leads A shielding wall positioned to block is provided, and the shielding wall includes at least a resin portion that thermally connects the partition and the heat generating element.

According to this, the heat generated from the heat generating element is transferred to the partition wall via the resin portion, thereby dissipating the heat to the housing. As a result, the heating element can be cooled. Further, even if the explosion-proof valve opens and the electrolytic solution inside the capacitor scatters to the outside of the capacitor, the electrolytic solution flowing toward each lead portion is blocked by the shielding wall including at least the resin portion. Therefore, it is possible to easily prevent the electrolytic solution scattered from the capacitor from adhering to the lead portions. As a result, it is avoided that the lead portions are short-circuited through the electrolyte. Therefore, the resin portion that contributes to dissipating the heat generated from the heat generating element can also dam the electrolyte flowing toward each lead portion. As described above, it is possible to suitably achieve both cooling of the heating element and avoidance of a short circuit between the lead portions via the electrolytic solution.

In the above electric compressor, the shielding wall may include a protruding wall that is part of the partition and protrudes toward the heating element. According to this, the number of resin parts is small, so productivity is excellent.

In the above electric compressor, the housing preferably has a partition wall that partitions an accommodation space for accommodating the capacitor within the inverter chamber, and the partition wall forms at least a portion of the shield wall.

According to this, even if the explosion-proof valve opens and the electrolytic solution inside the capacitor scatters to the outside of the capacitor, the electrolytic solution can be blocked by the partition wall. Therefore, it is possible to further suppress leakage of the electrolytic solution from the accommodation space for accommodating the capacitor, thereby further avoiding adhesion of the electrolytic solution to the electronic components existing around the accommodation space for accommodating the capacitor. be able to.

In the electric compressor, the explosion-proof valve is positioned vertically above the shielding wall when fixed to the mounting target, and the plurality of lead portions are positioned vertically with respect to the shielding wall. It should be located below.

According to this, even if the electrolytic solution that is scattered from the capacitor flows downward due to its own weight and flows toward the respective lead portions, the electrolytic solution that flows toward the respective lead portions is blocked by the shield wall. Therefore, it is possible to easily prevent the electrolytic solution scattered from the capacitor from adhering to the lead portions.

In the above electric compressor, a shunt resistor for detecting current flowing to the electric motor is mounted on the circuit board, and the heating element may be the shunt resistor.
According to this, the heat generated from the shunt resistor is transferred to the partition wall via the resin portion, thereby being radiated to the housing. As a result, the shunt resistor can be cooled. Here, the shunt resistor is an electronic component arranged relatively close to the switching element in terms of layout. Therefore, the resin portion that contributes to dissipating the heat generated from the shunt resistor is suitable for damming the electrolyte flowing toward each lead portion.

According to the present invention, it is possible to suitably achieve both cooling of the heating element and avoidance of a short circuit between the lead portions via the electrolytic solution.

It is a sectional view of an electric compressor in an embodiment. It is sectional drawing which expands and shows a part of electric compressor. It is a sectional view showing the inside of an inverter room typically. FIG. 4 is a cross-sectional view schematically showing a state in which the explosion-proof valve is opened and the electrolytic solution is scattered;

An embodiment embodying an electric compressor will be described below with reference to FIGS. 1 to 4. FIG. The electric compressor of this embodiment is used, for example, in a vehicle air conditioner.
<Electric Compressor 10>
As shown in FIG. 1 , the electric compressor 10 has a tubular housing 11 . The housing 11 has a discharge housing 12 , a motor housing 13 and an inverter cover 14 . The discharge housing 12, the motor housing 13, and the inverter cover 14 are made of metal material, for example, aluminum. The discharge housing 12 has a discharge port 12h. The electric compressor 10 includes a rotating shaft 15 , a compression section 16 , an electric motor 17 and an inverter 30 .

The motor housing 13 has a plate-like end wall 13a, a cylindrical peripheral wall 13b, and a cylindrical extension wall 13c. The peripheral wall 13b extends cylindrically from the outer peripheral portion of the end wall 13a. The extension wall 13c extends cylindrically from the outer peripheral portion of the end wall 13a to the side opposite to the peripheral wall 13b. The motor housing 13 has an intake port 13h. The suction port 13h is formed in the peripheral wall 13b of the motor housing 13. As shown in FIG. The intake port 13h is formed in a portion of the peripheral wall 13b located near the end wall 13a.

The rotating shaft 15 is arranged inside the peripheral wall 13 b of the motor housing 13 . The rotating shaft 15 is rotatably supported by the housing 11 . The rotating shaft 15 is accommodated in the housing 11 in a state in which the axial direction in which the rotation axis of the rotating shaft 15 extends coincides with the axial direction of the peripheral wall 13 b of the motor housing 13 . Therefore, the axial direction of the rotating shaft 15 coincides with the axial direction of the housing 11 .

<Compressor 16>
The compression section 16 compresses the refrigerant as a fluid. The compression portion 16 is arranged inside the peripheral wall 13 b of the motor housing 13 . Compressor 16 is driven by rotation of rotating shaft 15 . The compression section 16 is, for example, a scroll type composed of a fixed scroll and an orbiting scroll (not shown). The fixed scroll is fixed to the inner peripheral surface of the peripheral wall 13b of the motor housing 13. As shown in FIG. The orbiting scroll revolves around the fixed scroll as the rotary shaft 15 rotates.

<Motor room 18>
The electric motor 17 is arranged inside the peripheral wall 13 b of the motor housing 13 . The compression unit 16 and the electric motor 17 are arranged side by side in the axial direction of the rotating shaft 15 . The electric motor 17 is arranged closer to the end wall 13a of the motor housing 13 than the compression portion 16 is. Therefore, a motor chamber 18 that accommodates the electric motor 17 is formed between the compression portion 16 and the end wall 13a in the space inside the peripheral wall 13b of the motor housing 13. As shown in FIG. The housing 11 thus has a motor chamber 18 . The motor chamber 18 communicates with the suction port 13h.

<Inverter room 19>
Inverter cover 14 is plate-shaped. The inverter cover 14 is fixed to the extension wall 13c of the motor housing 13 while closing the opening of the extension wall 13c. An inverter chamber 19 is defined by the end wall 13 a and the extension wall 13 c of the motor housing 13 and the inverter cover 14 . Therefore, the housing 11 has an inverter chamber 19 . The inverter room 19 accommodates the inverter 30 . An end wall 13 a of the motor housing 13 is a partition wall separating the motor chamber 18 and the inverter chamber 19 . The compression unit 16 , the electric motor 17 , and the inverter 30 are arranged side by side in the axial direction of the rotating shaft 15 in this order.

<Electric motor 17>
The electric motor 17 drives the compression section 16 by rotating the rotating shaft 15 . The electric motor 17 has a tubular stator 20 and a tubular rotor 21 . The rotor 21 is arranged inside the stator 20 . The rotor 21 rotates integrally with the rotating shaft 15 . The rotor 21 has a rotor core 21a fixed to the rotating shaft 15 and a plurality of permanent magnets (not shown) provided on the rotor core 21a. Stator 20 surrounds rotor 21 . The stator 20 has a cylindrical stator core 20a and a motor coil 22 wound around the stator core 20a.

<External refrigerant circuit 23>
A first end of the external refrigerant circuit 23 is connected to the suction port 13h. A second end of the external refrigerant circuit 23 is connected to the discharge port 12h. Refrigerant flowing through the external refrigerant circuit 23 is sucked into the motor chamber 18 through the suction port 13h. The refrigerant sucked into the motor chamber 18 is compressed by the compression section 16 as the compression section 16 is driven. The refrigerant compressed by the compression section 16 is discharged to the external refrigerant circuit 23 through the discharge port 12h. The refrigerant discharged from the discharge port 12h to the external refrigerant circuit 23 flows back into the motor chamber 18 via the suction port 13h through the heat exchanger and the expansion valve of the external refrigerant circuit 23 . The electric compressor 10 and the external refrigerant circuit 23 constitute a vehicle air conditioner 24 .

<Inverter 30>
As shown in FIG. 2, the inverter 30 has a circuit board 31 . Inverter 30 drives electric motor 17 . A shunt resistor 32 , a capacitor 33 , and a switching element 34 are mounted on the circuit board 31 . The circuit board 31 has a mounting surface 31a on which the shunt resistor 32, the capacitor 33, and the switching element 34 are mounted. The shunt resistor 32 is positioned between the capacitor 33 and the switching element 34 on the mounting surface 31 a of the circuit board 31 . The circuit board 31 is accommodated in the inverter chamber 19 with the mounting surface 31 a facing the end wall 13 a of the motor housing 13 . The thickness direction of the circuit board 31 coincides with the axial direction of the rotating shaft 15 . Therefore, the thickness direction of the circuit board 31 coincides with the axial direction of the housing 11 .

<Shunt resistor 32>
The shunt resistor 32 is arranged between the mounting surface 31 a of the circuit board 31 and the end wall 13 a of the motor housing 13 . A shunt resistor 32 is used to detect an input current input to the inverter 30 from an external power supply (not shown). Therefore, the shunt resistor 32 detects current flowing to the electric motor 17 . The shunt resistor 32 is a heating element that generates heat when current flows. Therefore, the shunt resistor 32 generates heat as the electric motor 17 is driven. The heating element of this embodiment is the shunt resistor 32 .

<Capacitor 33>
The capacitor 33 is arranged between the mounting surface 31 a of the circuit board 31 and the end wall 13 a of the motor housing 13 . A projection length H1 of the capacitor 33 from the mounting surface 31a is longer than a projection length H2 of the shunt resistor 32 from the mounting surface 31a. Therefore, capacitor 33 is an electronic component taller than shunt resistor 32 .

The capacitor 33 is a filter element that reduces noise contained in the input current from the outside. An electrolytic solution 35 is sealed inside the capacitor 33 . Therefore, capacitor 33 is an electrolytic capacitor. In addition, in FIG. 2, the electrolytic solution 35 is virtually illustrated by a chain double-dashed line. The capacitor 33 has an explosion-proof valve 33a. The explosion-proof valve 33a is configured to open when the pressure inside the capacitor 33 rises above a specified value. The explosion-proof valve 33 a serves as an ejection port for the electrolytic solution 35 inside the capacitor 33 . The explosion-proof valve 33a is arranged at the end of the capacitor 33 opposite to the mounting surface 31a.

<Switching element 34>
A plurality of switching elements 34 are mounted on the circuit board 31 . Specifically, the circuit board 31 is mounted with a power module 36 in which a plurality of switching elements 34 are modularized. The power module 36 is arranged between the mounting surface 31 a of the circuit board 31 and the end wall 13 a of the motor housing 13 .

The power module 36 has a module body 37 and a plurality of lead portions 38 . A plurality of switching elements 34 are embedded inside the module body 37 . The module body 37 is fixed to the end wall 13 a of the motor housing 13 .

Each lead portion 38 is, for example, a plate-shaped bus bar. Each lead portion 38 extends from the module body 37 toward the circuit board 31 . Each lead portion 38 is electrically connected to the circuit board 31 . The switching element 34 is electrically connected to the circuit board 31 through a plurality of lead portions 38 .

Each switching element 34 converts a DC voltage from an external power supply into an AC voltage by performing a switching operation. The AC voltage converted by the switching operation of each switching element 34 is supplied to the electric motor 17 as a driving voltage.

<Mounting Posture of Electric Compressor 10>
As shown in FIG. 1, the electric compressor 10 is fixed to an engine E1 to be mounted. FIG. 3 shows a plan view of the inverter chamber 19 from the opening side of the extension wall 13c. In addition, in FIG. 3, the shunt resistor 32, the capacitor 33, and the power module 36 are virtually indicated by two-dot chain lines. As shown in FIGS. 2 and 3, the electric compressor 10 is installed in the vehicle so that the capacitor 33 is positioned above the shunt resistor 32 in the vertical direction, and the power module 36 is positioned below the shunt resistor 32 in the vertical direction. installed in the As shown in FIG. 2, the radial direction of the rotating shaft 15 coincides with the vertical direction. The direction in which the circuit board 31 extends coincides with the vertical direction. The explosion-proof valve 33a is positioned above each lead portion 38 in the vertical direction.

<Protruding wall 40>
As shown in FIGS. 2 and 3, the motor housing 13 has a projecting wall 40 as part of the end wall 13a, which is a partition. The protruding wall 40 protrudes toward the shunt resistor 32 from the surface of the end wall 13 a of the motor housing 13 on the inverter chamber 19 side. The projecting wall 40 is integrally formed with the motor housing 13 . The protruding wall 40 is therefore made of a metallic material, for example aluminium.

The projecting wall 40 is located between the capacitor 33 and the power module 36 in the vertical direction. Specifically, as shown in FIG. 2, the projecting wall 40 is positioned between the explosion-proof valve 33a and each lead portion 38 in the vertical direction.

The projecting wall 40 has a first facing surface 40a and a second facing surface 40b. The first facing surface 40a faces the capacitor 33 in the vertical direction. Specifically, the first facing surface 40a vertically faces the explosion-proof valve 33a. The first opposing surface 40 a is the upper surface of the projecting wall 40 . Therefore, when the electric compressor 10 is fixed to the engine E<b>1 , the explosion-proof valve 33 a is positioned vertically above the projecting wall 40 . The second facing surface 40b faces the power module 36 in the vertical direction. Specifically, the second facing surface 40b faces each lead portion 38 in the vertical direction. The second facing surface 40 b is the lower surface of the projecting wall 40 . Therefore, when the electric compressor 10 is fixed to the engine E<b>1 , each lead portion 38 is positioned vertically below the projecting wall 40 . A tip surface 40 c of the projecting wall 40 overlaps the entire shunt resistor 32 in the thickness direction of the circuit board 31 . The tip surface 40c has a flat surface shape.

As shown in FIG. 3, the motor housing 13 has an upright wall 41. As shown in FIG. The standing wall 41 protrudes from the surface of the end wall 13 a of the motor housing 13 on the inverter chamber 19 side toward the inverter cover 14 . The standing wall 41 is integrally formed with the motor housing 13 . The standing wall 41 is connected to the projecting wall 40 . The erected wall 41 defines, together with the projecting wall 40 , an accommodation space 42 that accommodates the capacitor 33 . The standing wall 41 and the projecting wall 40 form a partition wall 43 that partitions the accommodation space 42 within the inverter chamber 19 . Accordingly, the housing 11 has partition walls 43 .

<Resin portion 45>
As shown in FIG. 2 , the electric compressor 10 has a resin portion 45 . The resin portion 45 is interposed between the projecting wall 40 and the shunt resistor 32 . Specifically, the resin portion 45 is interposed between the tip surface 40 c of the projecting wall 40 and the shunt resistor 32 . Therefore, the circuit board 31 is supported by the projecting wall 40 via the resin portion 45 . The resin portion 45 fills the gap between the tip surface 40c of the projecting wall 40 and the shunt resistor 32 . In addition, the resin portion 45 covers the upper portion of the shunt resistor 32 and the lower portion of the shunt resistor 32 . The resin portion 45 covers the entire shunt resistor 32 . The resin portion 45 thermally connects the end wall 13 a and the shunt resistor 32 .

The resin part 45 is a thermosetting resin. A silicone compound material, for example, is used for the resin portion 45 . A silicone compound material is softer than, for example, a silicone rubber adhesive seal. A shielding wall 44 positioned to shield between the explosion-proof valve 33 a and each lead portion 38 is provided in the inverter chamber 19 by the projecting wall 40 and the resin portion 45 . The shielding wall 44 includes at least a resin portion 45 . The standing wall 41 forms part of the shielding wall 44 . The partition wall 43 constitutes at least part of the shielding wall 44 .

In a state where the electric compressor 10 is fixed to the engine E1, the explosion-proof valve 33a is positioned vertically above the shield wall 44. As shown in FIG. When the electric compressor 10 is fixed to the engine E<b>1 , each lead portion 38 is positioned vertically below the shielding wall 44 .

<Conductive pin 46>
As shown in FIG. 3, the electric compressor 10 has a plurality of conductive pins 46 that electrically connect the electric motor 17 and the circuit board 31 while passing through the end wall 13a. A through hole 47 through which each conductive pin 46 passes is formed in the end wall 13a. A shielding wall 44 is positioned to shield between the capacitor 33 and the plurality of conductive pins 46 . Therefore, the shielding wall 44 is positioned to shield between the explosion-proof valve 33 a and the plurality of conductive pins 46 .

[Action of Embodiment]
Next, the operation of this embodiment will be described.
The heat generated from the shunt resistor 32 is transferred to the end wall 13 a of the motor housing 13 via the resin portion 45 and radiated to the motor housing 13 . As a result, the shunt resistor 32 is cooled.

In the capacitor 33, when the electrolytic solution 35 inside the capacitor 33 is vaporized, the pressure inside the capacitor 33 increases. The explosion-proof valve 33a opens when the pressure inside the capacitor 33 rises above a specified value.

As shown in FIG. 4, when the explosion-proof valve 33a is opened, the electrolytic solution 35 inside the capacitor 33 is scattered to the outside of the capacitor 33. As shown in FIG. At this time, the electrolyte 35 flowing toward each lead portion 38 is blocked by the protruding wall 40 forming the shielding wall 44 and the resin portion 45 . Specifically, the electrolytic solution 35 scattered from the capacitor 33 flows downward due to its own weight, and even if the electrolytic solution 35 flows toward the lead portions 38, the electrolytic solution 35 toward the lead portions 38 does not protrude. It is dammed up by the wall 40 and the resin portion 45 . Therefore, the electrolytic solution 35 scattered from the capacitor 33 is prevented from adhering to each lead portion 38 .

[Effects of Embodiment]
The following effects can be obtained in the above embodiment.
(1) A shielding wall 44 is provided in the inverter chamber 19 so as to shield between the explosion-proof valve 33a and each lead portion 38 . The shielding wall 44 includes at least a resin portion 45 that thermally connects the end wall 13 a of the motor housing 13 and the shunt resistor 32 . According to this, the heat generated from the shunt resistor 32 is transmitted to the end wall 13 a of the motor housing 13 through the resin portion 45 , thereby dissipating the heat to the housing 11 . As a result, the shunt resistor 32 can be cooled. Even if the explosion-proof valve 33a opens and the electrolytic solution 35 inside the capacitor 33 scatters to the outside of the capacitor 33, the electrolytic solution 35 flowing toward each of the lead portions 38 will flow through the shield wall 44 including at least the resin portion 45. dammed up by Therefore, the electrolytic solution 35 scattered from the capacitor 33 can be easily prevented from adhering to the lead portions 38 . As a result, the lead portions 38 are prevented from being short-circuited via the electrolyte 35 . Therefore, the resin portion 45 that contributes to dissipating heat generated from the shunt resistor 32 can also dam the electrolytic solution 35 flowing toward each lead portion 38 . As described above, both cooling of the shunt resistor 32 and avoidance of a short circuit between the lead portions 38 via the electrolytic solution 35 can be suitably achieved. Moreover, since the projecting wall 40 is made of metal, it is excellent in heat dissipation.

(2) The shielding wall 44 includes a protruding wall 40 that is part of the end wall 13 a of the motor housing 13 and protrudes toward the shunt resistor 32 . According to this, since the resin portion 45 can be reduced, the productivity is excellent.

(3) The motor housing 13 has a partition wall 43 . According to this, even if the explosion-proof valve 33 a is opened and the electrolytic solution 35 inside the capacitor 33 splashes to the outside of the capacitor 33 , the electrolytic solution 35 can be blocked by the partition wall 43 . Therefore, it is possible to further suppress leakage of the electrolytic solution 35 from the accommodation space 42 that accommodates the capacitor 33 , so that the electrolytic solution 35 does not adhere to the electronic components around the accommodation space 42 that accommodates the capacitor 33 . It is possible to avoid more tucking away.

(4) The explosion-proof valve 33a is positioned vertically above the shielding wall 44 . Each lead portion 38 is positioned vertically below the shielding wall 44 . According to this, the electrolytic solution 35 scattered from the capacitor 33 flows downward due to its own weight, and even if the electrolytic solution 35 flows toward each lead portion 38, the electrolytic solution 35 flowing toward each lead portion 38 is shielded. It is blocked by wall 44 . Therefore, the electrolytic solution 35 scattered from the capacitor 33 can be easily prevented from adhering to the lead portions 38 .

(5) A shunt resistor 32 is mounted on the circuit board 31 . According to this, the heat generated from the shunt resistor 32 is transmitted to the end wall 13 a of the motor housing 13 through the resin portion 45 , thereby dissipating the heat to the housing 11 . As a result, the shunt resistor 32 can be cooled. Here, the shunt resistor 32 is an electronic component arranged relatively close to the switching element 34 in terms of layout. Therefore, the resin portion 45 that contributes to dissipating heat generated from the shunt resistor 32 is suitable for blocking the electrolytic solution 35 flowing toward each lead portion 38 .

(6) The resin portion 45 is made of a thermosetting resin, such as a silicone compound material. A silicone compound material is softer than, for example, a silicone rubber adhesive seal. For example, when the resin portion 45 is an adhesive seal made of a silicone rubber material, the load required to crush the resin portion 45 when filling the gap between the projecting wall 40 and the shunt resistor 32 with the resin portion 45 is It becomes larger than in the case of the silicone compound material. Therefore, a load is easily applied to the shunt resistor 32 . Therefore, by using a silicone compound material, which is a softer material than the silicone rubber adhesive seal, for the resin portion 45, when filling the gap between the projecting wall 40 and the shunt resistor 32 with the resin portion 45, the resin portion The load required to crush 45 is relatively small. Therefore, the load applied to the shunt resistor 32 can be relaxed.

(7) The circuit board 31 is supported by the projecting wall 40 via the resin portion 45 . A silicone compound material, for example, is used for the resin portion 45 . A silicone compound material is softer than, for example, a silicone rubber adhesive seal. With this configuration, the resin portion 45 can more easily absorb vibrations that are transmitted from the motor housing 13 to the circuit board 31, compared to the case where the resin portion 45 is an adhesive seal made of a silicone rubber material, for example. Therefore, vibration of the circuit board 31 can be easily suppressed.

(8) Consider, for example, the case where the motor housing 13 does not have the projecting wall 40 and the gap between the shunt resistor 32 and the end wall 13 a of the motor housing 13 is filled with the resin portion 45 . In this case, the resin portion 45 is thicker than when the gap between the protruding wall 40 and the shunt resistor 32 is filled with the resin portion 45, so that the heat generated from the shunt resistor 32 passes through the resin portion 45 to the motor housing. It becomes difficult to transmit to the end wall 13a of 13. Therefore, the motor housing 13 is configured to have the projecting wall 40 . According to this, the thickness of the resin portion 45 existing in the gap between the projecting wall 40 and the shunt resistor 32 becomes thinner than in the case where the motor housing 13 does not have the projecting wall 40 . Therefore, heat generated from the shunt resistor 32 is easily transmitted to the end wall 13 a of the motor housing 13 through the resin portion 45 . Therefore, the heat generated from the shunt resistor 32 can be efficiently radiated to the housing 11, so that the shunt resistor 32 can be efficiently cooled.

(9) The shielding wall 44 is positioned to shield between the explosion-proof valve 33 a and the plurality of conductive pins 46 . This prevents the electrolyte 35 from adhering to the plurality of conductive pins 46 and short-circuiting the conductive pins 46 via the electrolyte 35 .

[Change example]
It should be noted that the above embodiment can be implemented with the following modifications. The above embodiments and the following modifications can be combined with each other within a technically consistent range.

O In the embodiment, the electric compressor 10 may not be mounted on the vehicle such that the capacitor 33 is positioned above the shunt resistance 32 and the power module 36 is positioned below the shunt resistance 32 . In short, the mounting posture of the electric compressor 10 with respect to the vehicle is not particularly limited. Therefore, the explosion-proof valve 33 a does not have to be positioned above the protruding wall 40 , and the lead portions 38 need not be positioned below the protruding wall 40 .

O In the embodiment, three shunt resistors 32 corresponding to each of the U-phase, V-phase, and W-phase currents may be arranged in a row. The wall-like shape of the projecting wall 40 is suitable for cooling the plurality of shunt resistors 32 .

O In the embodiment, the heating element is not limited to the shunt resistor 32, and may be another electronic component.
(circle) in embodiment, the motor housing 13 may be the structure which does not have the erection wall 41. FIG.

(circle) in embodiment, the compression part 16 may be not only a scroll type but a piston type, a vane type, etc., for example.
O In the embodiment, the electric compressor 10 is fixed to the engine E1 to be mounted, but it is not limited to this, and may be fixed to the body of the vehicle, for example. In short, the mounting target of the electric compressor 10 is not particularly limited.

O Although the electric compressor 10 was used for the vehicle air conditioner 24 in embodiment, it is not restricted to this. For example, the electric compressor 10 may be mounted on a fuel cell vehicle and compress air as a fluid to be supplied to the fuel cell.

DESCRIPTION OF SYMBOLS 10... Electric compressor, 11... Housing, 13a... End wall which is a partition, 16... Compression part, 17... Electric motor, 18... Motor room, 19... Inverter room, 30... Inverter, 31... Circuit board, 32... Heat generation Element shunt resistor 33 Capacitor 33a Explosion-proof valve 34 Switching element 35 Electrolyte 38 Lead 40 Protruding wall 42 Housing space 43 Partition wall 44 Shielding wall 45: Resin part, E1: Engine to be mounted.

Claims (5)

a compression section for compressing a fluid;
an electric motor that drives the compression unit;
an inverter that drives the electric motor and has a circuit board;
a housing having a motor chamber that houses the electric motor and an inverter chamber that houses the inverter;
The housing has a partition wall separating the motor chamber and the inverter chamber,
The circuit board has
a heating element that generates heat as the electric motor is driven;
a capacitor having an explosion-proof valve serving as an internal electrolyte ejection port;
and a switching element having a plurality of lead portions electrically connected to the circuit board, wherein the electric compressor is mounted with
the heating element is positioned between the capacitor and the switching element on the circuit board;
A shielding wall positioned to shield between the explosion-proof valve and the plurality of lead portions is provided in the inverter chamber,
The electric compressor, wherein the shield wall includes at least a resin portion that thermally connects the partition wall and the heat generating element. 2. The electric compressor according to claim 1, wherein the shielding wall includes a protruding wall which is a part of the partition and protrudes toward the heating element. The housing has a partition wall that partitions an accommodation space for accommodating the capacitor within the inverter chamber,
3. The electric compressor according to claim 1, wherein the partition wall forms at least part of the shield wall. In the state fixed to the mounting target,
The explosion-proof valve is positioned vertically above the shielding wall,
The electric compressor according to any one of claims 1 to 3, wherein the plurality of lead portions are positioned vertically below the shielding wall. A shunt resistor for detecting current flowing to the electric motor is mounted on the circuit board,
The electric compressor according to any one of claims 1 to 4, wherein the heating element is the shunt resistor.

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