Electric supercharger

Abstract

An electric supercharger includes a motor housing that houses a motor, a compressor housing that includes a scroll flow path, and a diffuser plate disposed between the motor housing and the compressor housing. The electric supercharger includes a rotor fixed to a rotating shaft, a motor stator fixed to a motor housing, a heat dissipation member disposed between a diffuser plate and the stator, and a seal member disposed between the diffuser plate and the stator and between the heat dissipation member and the rotating shaft.

Description

Technical Field

[0001] The present disclosure relates to electric superchargers. Background Art

[0002] Patent Document 1 discloses a motor-integrated compressor-turbine unit. The compressor-turbine unit includes a motor housing that houses a motor and a compressor housing. A diffuser plate that forms a diffuser flow path is disposed between the casing and the compressor housing.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2010-45905

[0004] The motor that rotates the impeller becomes a heat source. In order to maintain the performance of the motor, it is necessary to improve the heat removal (cooling performance) for dissipating the heat generated by the motor to the outside of the motor. Summary of the invention

[0005] The present disclosure provides an electric supercharger capable of improving heat removal performance for dissipating heat generated by a motor to the outside of the motor.

[0006] An electric supercharger as an example of the present disclosure is an electric supercharger including: a motor housing for housing a motor, a compressor housing including a vortex flow path, and a diffuser plate disposed between the motor housing and the compressor housing. The electric supercharger includes: a rotor fixed to a rotating shaft; a motor stator fixed to the motor housing; a heat dissipation component disposed between the diffuser plate and the stator; and a sealing component disposed between the diffuser plate and the stator and disposed between the heat dissipation component and the rotating shaft.

[0007] In the electric supercharger, a heat dissipation component is arranged between the diffuser plate and the stator. Since the heat from the stator is transferred to the diffuser plate via the heat dissipation component, the heat removal performance can be improved compared with a method without the heat dissipation component. In addition, a sealing component is arranged between the diffuser plate and the stator, and the sealing component is arranged between the heat dissipation component and the rotating shaft. Therefore, it is possible to prevent the gas around the rotating shaft from passing between the diffuser plate and the stator and reaching the heat dissipation component, thereby affecting the heat dissipation component.

[0008] In some embodiments, a sealing groove may be formed in the stator, and the sealing groove accommodates the sealing member and contacts the sealing member. By accommodating the sealing member in the sealing groove, the sealing member can be set at an appropriate position.

[0009] In some embodiments, the stator may also include: a heat dissipation component setting portion, on which the heat dissipation component is set; and a sealing component setting portion, which is opposite to the diffuser plate and protrudes from the heat dissipation component setting portion and is formed with a sealing groove. A recess may also be formed in the diffuser plate, the recess receiving the sealing component setting portion and in contact with the sealing component. Electrical insulation between the diffuser plate and the coil of the stator needs to be ensured. Since the sealing groove is formed in the sealing component setting portion protruding from the heat dissipation component setting portion, the sealing groove can be formed at a position away from the coil than the heat dissipation component setting portion, and it is easy to ensure electrical insulation between the diffuser plate and the coil of the stator.

[0010] In some embodiments, the heat dissipation member may be a heat dissipation pad having a predetermined shape. By using the heat dissipation pad, it is easy to install it at a predetermined position.

[0011] In some embodiments, the stator may also include: a heat dissipation component installation portion on which the heat dissipation pad is installed; and a positioning portion that protrudes from the heat dissipation component installation portion and positions the heat dissipation pad. The heat dissipation pad is easily arranged at an appropriate position by interfering with the positioning portion and being arranged along the positioning portion.

[0012] In some embodiments, a cooling water flow path through which cooling water flows may be formed in the diffuser plate, and a heat sink may be disposed between the cooling water flow path and the stator. By disposing the heat sink between the cooling water flow path and the stator, heat from the stator is easily transferred to the cooling water flow path.

[0013] In some embodiments, the stator may include a resin portion, and the heat dissipation component has a higher thermal conductivity than the resin portion and a lower thermal conductivity than the diffuser plate. Heat is transferred from the resin portion of the stator to the heat dissipation component and from the heat dissipation component to the diffuser plate.

[0014] In some embodiments, the heat dissipation component may be a heat dissipation pad, and the diffuser plate includes: a first end surface in contact with the heat dissipation pad, and a second end surface forming a diffuser flow path on a side opposite to the first end surface, and the heat dissipation pad is thinner than the thickness of the diffuser plate from the first end surface to the second end surface. By making the thickness of the heat dissipation pad thinner than the thickness of the diffuser plate, the heat removal performance from the stator to the diffuser plate can be improved.

[0015] In addition, an electric supercharger as an example of the present disclosure includes: a motor including a rotor and a stator; a rotating shaft that is rotated by being driven by the motor; an impeller that is fixed to the rotating shaft; a compressor housing that accommodates the impeller; a diffuser plate that is fixed to the compressor housing; a heat dissipation layer that is arranged between the diffuser plate and the stator; and a sealing portion that is arranged between the diffuser plate and the stator and between the heat dissipation layer and the rotating shaft to restrict the passage of gas.

[0016] According to the present disclosure, it is possible to improve the heat removal performance for dissipating the heat generated in the motor to the outside of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a cross-sectional view schematically showing an example of an electric supercharger.

[0018] Figure 2 yes Figure 1 A partial enlarged cross-sectional view of an electric supercharger is shown.

[0019] Figure 3 It means that Figure 1 An exploded cross-sectional view of the stator assembly, sealing component, heat sink, and diffuser plate before assembly is shown.

[0020] Figure 4 yes Figure 1 A top view of the thermal pad is shown.

[0021] Figure 5 yes Figure 1 A perspective view of the stator assembly is shown.

[0022] Figure 6 It is a cross-sectional view schematically showing the relationship between the diffuser plate, the heat dissipation pad, the sealing member, and the stator.

[0023] Figure 7 (a) is a cross-sectional view schematically showing an example of a diffuser plate, a heat dissipation pad, a sealing member, and a stator.

[0024] Figure 7 (b) is a cross-sectional view schematically showing another example of a diffuser plate, a heat dissipation pad, a sealing member, and a stator. DETAILED DESCRIPTION

[0025] Hereinafter, examples for implementing the present disclosure will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals and repeated descriptions are omitted.

[0026] Figure 1 1 is a cross-sectional view of an electric supercharger 1 according to an example of the present disclosure. Figure 2 FIG. 2 is a cross-sectional view showing a part of the electric supercharger 1 in an enlarged manner. Figure 1 and Figure 2 As shown, the electric supercharger 1 includes: a compressor 10, a motor 20 and a turbine 30. The electric supercharger 1 drives the compressor 10 by the motor 20 which uses electricity as a power source. The compressor 10 receives power from the motor 20 via a rotating shaft S and compresses air. The compressed air is discharged to an internal combustion engine, for example. The turbine 30 recovers exhaust gas discharged from the internal combustion engine, for example, and assists the rotation of the rotating shaft S.

[0027] The compressor 10 includes an impeller 11 and a compressor housing 12. The compressor housing 12 includes an inlet 13 and a vortex flow path 14. The inlet 13 is an opening coaxial with the rotation axis S. The vortex flow path 14 is formed around the rotation axis RL. For example, the impeller 11 is fixed to the rotation axis S and is accommodated in the compressor housing 12. The impeller 11 is arranged on the inner side of the inlet 13 when viewed from the outside of the compressor 10. The vortex flow path 14 is formed around the impeller 11. The air sucked from the inlet 13 reaches the vortex flow path 14 via the impeller 11. A diffuser flow path 15 is formed between the impeller 11 and the vortex flow path 14. The diffuser flow path 15 receives air from the impeller 11 and transfers the air to the vortex flow path 14. The diffuser flow path 15 is formed by the wall surface of the compressor housing 12 and the diffuser plate 40 fixed to the compressor housing 12.

[0028] The motor 20 includes a rotor 21 and a stator 22. The rotor 21 is fixed to the rotating shaft S and rotates together with the rotating shaft S. The rotor 21 includes, for example, a plurality of permanent magnets. The stator 22 is a component provided to surround the rotor 21. The stator 22 includes a coil 22a. The rotating shaft S rotates when the motor 20 is driven.

[0029] The motor 20 is accommodated in a motor housing 27. The motor housing 27 includes a stator case 23, a path section 24, and an outer housing 25. The stator case 23 accommodates the stator 22. The path section 24 is fixed to the stator case 23. The outer housing 25 is provided to surround the stator case 23 and the path section 24.

[0030] The stator case 23 is cylindrical, and the stator 22 is fixed inside the stator case 23. The stator 22 includes a coil 22a wound around the teeth, and a resin portion 22b filled in the stator case 23 and surrounding the coil 22a. The resin portion 22b is formed of a thermosetting resin.

[0031] The stator housing 23 has an end portion on one side facing the diffuser plate 40, and the end portion is open. The end portion on the opposite side of the stator housing 23 is closed by the housing end surface 23a. A cooling water flow path F1 is formed between the housing end surface 23a and the outer housing 25. The cooling water flow path F1 is provided along the housing end surface 23a, and cooling water passes through the cooling water flow path F1.

[0032] The path area 24 is attached to the outer periphery of the stator case 23. The path area 24 is formed as a component independent of the stator case 23. A connection passage F2 for cooling water is formed in the path area 24. The path area 24 is not limited to an independent component, and may be integrated with the outer case 25, for example.

[0033] The resin portion 22b is provided in the stator housing 23. One end of the stator housing 23 is opened, and the end of the resin portion 22b is exposed. The end of the resin portion 22b is arranged to face the diffuser plate 40. A heat dissipation layer is arranged between the resin portion 22b and the diffuser plate 40. For example, a heat dissipation component 28 is arranged between the resin portion 22b and the diffuser plate 40.

[0034] The diffuser plate 40 is disposed between the motor housing 27 and the compressor housing 12. The diffuser plate 40 is formed of a member having high thermal conductivity such as an aluminum alloy. For example, in the case of an aluminum alloy, the thermal conductivity is about 150 W / mK. The diffuser plate 40 includes a first end surface 40a (see Figure 3 ) and a second end face 40b located on the opposite side. The second end face 40b forms the diffuser flow path 15. The diffuser plate 40 is formed as an integral body from the first end face 40a to the second end face 40b without being divided.

[0035] The diffuser plate 40 has a cooling water passage F3 through which cooling water passes. The cooling water passage F3 is fluidically connected to the cooling water passage F1 of the motor housing 27 via the connecting passage F2 of the path section 24. The heat sink 28 is disposed between the cooling water passage F3 of the diffuser plate 40 and the stator 22.

[0036] Reference Figure 3 , Figure 4 , Figure 5 and Figure 6 The structures of the stator 22, the heat sink 28 and the diffuser plate 40 are described in more detail. The resin portion 22b includes a heat sink installation portion 22c and a head portion 22d protruding from the heat sink installation portion 22c. The heat sink installation portion 22c is substantially a flat surface. The heat sink 28 is disposed on the heat sink installation portion 22c.

[0037] The heat dissipation component 28 is, for example, a heat dissipation filler, a heat dissipation grease, or a heat dissipation pad 28A, or a mixture thereof. The thermal conductivity of the heat dissipation component 28 is, for example, greater than 2 W / mK and less than 10 W / mK. In addition, the thermal conductivity of the heat dissipation component 28 is, for example, greater than 2.5 W / mK and less than 5 W / mK. In addition, the thermal conductivity of the heat dissipation component 28 is, for example, greater than 3 W / mK and less than 4 W / mK. The thermal conductivity of the heat dissipation component 28 is, for example, higher than the thermal conductivity of the resin portion 22 b, and lower than the thermal conductivity of the diffuser plate 40.

[0038] The heat dissipation filler is, for example, a fluid having a viscosity that allows shape retention, and is a component having fine particles (filler) of ceramics, metals, etc. with high thermal conductivity. The heat dissipation filler is set on the heat dissipation component setting portion 22c and then solidified. The heat dissipation grease is, for example, a component based on a grease such as modified silicone and mixed with fine particles of ceramics, metals, etc. with high thermal conductivity.

[0039] Figure 4 : is a top view of a heat sink 28A as an example of a heat sink component 28. The heat sink 28A is a sheet having a predetermined shape. Having a predetermined shape means that it has a stable shape before being arranged between the diffuser plate 40 and the stator 22. For example, as a predetermined shape, the heat sink 28A can have a shape along the outer edge of the heat sink component setting portion 22c. In addition, as a predetermined shape, the heat sink 28A can have a shape that can be arranged on the heat sink component setting portion 22c avoiding the head 22d. For example, the heat sink 28A is annular (donut-shaped) when viewed from above, and has a circular opening 28a on the inside. The heat sink 28A is a component formed of a resin such as silicone and acrylic into a thin sheet. It can also be a structure in which fine particles of ceramics, metals, etc. with high thermal conductivity are provided in the heat sink 28A. In addition, the heat sink 28A can also be a thermally conductive sheet using graphite as a raw material. In addition, the heat sink component 28 can also be a thermal pad.

[0040] The thickness of the heat dissipation pad 28A is, for example, greater than 0.2 mm and less than 5 mm. In addition, the thickness of the heat dissipation pad 28A can be greater than 0.4 mm and less than 4 mm. In addition, the thickness of the heat dissipation pad 28A can be greater than 0.3 mm and less than 3 mm. The thickness of the heat dissipation pad 28A is, for example, thinner than the thickness of the diffuser plate 40. Specifically, the diffuser plate 40 has a first end face 40a and a second end face 40b, and the thickness of the heat dissipation pad 28A can also be thinner than the thickness of the thickest portion of the thickness from the first end face 40a to the second end face 40b. In addition, the thickness of the heat dissipation pad 28A can also be thinner than the thickness of the thinnest portion of the thickness from the first end face 40a to the second end face 40b.

[0041] like Figure 5 As shown in FIG. 1 , a heat dissipation component installation portion 22c as an annular (donut-shaped) flat surface is provided on the end surface of the resin portion 22b, and an annular (donut-shaped) head portion 22d is provided inside the heat dissipation component installation portion 22c. The heat dissipation component installation portion 22c and the head portion 22d are provided to face the diffuser plate 40. The head portion 22d protrudes relative to the imaginary surface including the heat dissipation component installation portion 22c. An opening for inserting the rotating shaft S and the rotor 21 is formed inside the head portion 22d.

[0042] A sealing groove 22e for accommodating a sealing component 29 such as an O-ring is formed at the front end of the head 22d. The sealing component 29 is an example of a sealing portion. The sealing component 29 accommodated in the sealing groove 22e is flattened due to contact with the diffuser plate 40, and is elastically deformed to perform a sealing function. The sealing function of the sealing component 29 refers to a function of restricting the passage of air (gas) and substantially preventing the passage of air (gas). The sealing component 29 is configured to surround the rotating shaft S in the circumferential direction of the rotating shaft S. The sealing component 29 is arranged between the heat dissipation component 28 arranged on the heat dissipation component setting portion 22c and the rotating shaft S. For example, the sealing component 29 is arranged between the heat dissipation pad 28A and the rotating shaft S. The sealing component 29 prevents the air (gas) existing around the rotating shaft S and the rotor 21 from reaching the heat dissipation component 28. The head 22d is an example of a sealing component setting portion.

[0043] The sealing member 29 is, for example, a non-metallic gasket, a semi-metallic gasket using a combination of metal and non-metal, or a metal gasket. Non-metallic gaskets are, for example, non-metallic O-rings, rubber sheets, PTFE sheets, etc. Semi-metallic gaskets are, for example, metal sheath-shaped gaskets, spiral-shaped gaskets, etc. Metal gaskets are, for example, metal O-rings, metal flat gaskets, etc.

[0044] like Figure 3 As shown in FIG. 1 , the diffuser plate 40 includes an opposing portion 41 that opposes the end of the stator case 23 and the end of the resin portion 22b. The opposing portion 41 is provided with a peripheral wall portion 41c into which the end of the stator case 23 is inserted. An annular (donut-shaped) contact surface 41a that abuts against the heat dissipation member 28 and an annular (donut-shaped) recessed portion 41b that receives the head 22d are provided on the inner side of the peripheral wall portion 41c. The recessed portion 41b contacts the sealing member 29 received in the sealing groove 22e of the head 22d.

[0045] The head 22d is inserted so as to fit into the opening 28a at the center of the heat dissipation pad 28A, and positions the heat dissipation pad 28A. The head 22d is an example of a positioning portion of the heat dissipation pad 28A. In the example disclosed in the present invention, the head 22 functions as both a sealing member installation portion and a positioning portion.

[0046] As another example, a positioning portion may be provided separately from the sealing member setting portion. Figure 7 As shown in FIG. 2 (a), a head 22x (an example of a sealing member installation portion) and a protruding wall 22y (an example of a positioning portion) are provided. The head 22x is disposed between the heat dissipation pad 28A and the rotation axis S, and is provided at a position that does not abut against the heat dissipation pad 28A. In addition, the protruding wall 22y protrudes in an annular shape in a manner surrounding the outer edge of the heat dissipation pad 28A, abuts against the outer edge of the heat dissipation pad 28A, and positions the heat dissipation pad 28A.

[0047] In addition, as another example, Figure 7 As shown in FIG. (b), a sealing member installation portion 22w and a protruding wall 22z (an example of a positioning portion) are provided. In this example, the sealing member installation portion 22w is formed by providing a sealing groove 22v substantially on the same surface without protruding relative to the heat dissipation member installation portion 22c. In addition, the protruding wall 22z protrudes in an annular shape so as to surround the outer edge of the heat dissipation pad 28A, and abuts against the outer edge of the heat dissipation pad 28A to position the heat dissipation pad 28A.

[0048] Next, refer to Figure 1 and Figure 3 A manufacturing method for manufacturing the electric supercharger 1 by assembling various components and structures is described. For example, the motor assembly 200 is set at a predetermined position. In the motor assembly 200, the stator housing 23 is fixed in the motor housing 27. The coil 22a is accommodated in the stator housing 23, and a resin portion 22b is formed in a manner that further surrounds the coil 22a. In addition, the rotating shaft S and the rotor 21 are arranged in the stator housing 23. In addition, the motor assembly 200 is assembled with a turbine 30, for example.

[0049] The compressor 10 is assembled in the motor assembly 200. Since the motor assembly 200 is a heavy object, it is pre-set at a predetermined position, and the components of the compressor 10 are assembled from the top. Specifically, the motor assembly 200 is arranged longitudinally so that the rotation axis S faces the up-down direction. In this state, the turbine 30 is arranged at the bottom, and the stator housing 23 and the stator 22 are arranged at the top. Hereinafter, the stator housing 23 and the stator 22 are referred to as the stator assembly 2.

[0050] like Figure 3 As shown, for example, a heat sink 28 is provided for the stator assembly 2. In the case of an annular heat sink 28A, the heat sink 28A is mounted so as to surround the head 22d. The heat sink 28A is easily positioned by contacting the head 22d, thereby improving assembly workability.

[0051] In addition, a sealing member 29 is provided on the sealing groove 22e with respect to the stator assembly 2 arranged in the longitudinal direction. The sealing member 29 may be provided before or after the heat dissipation pad 28A is provided. Since the sealing member 29 is accommodated in the sealing groove 22e, the sealing member 29 can be positioned and stably held.

[0052] The diffuser plate 40 is installed in a manner of covering the stator assembly 2 with the heat dissipation pad 28A and the sealing member 29 installed at predetermined positions. A peripheral wall portion 41c is provided on the facing portion 41 of the diffuser plate 40, and the upper end portion of the stator assembly 2 is inserted into the inner side of the peripheral wall portion 41c. An annular recessed portion 41b is provided on the facing portion 41, and the head portion 22d is inserted into the recessed portion 41b. After the diffuser plate 40 is installed on the stator assembly 2, the compressor housing 12 and the like are appropriately assembled, and the electric supercharger 1 is completed.

[0053] As described above, the motor assembly 200 is a heavy object. Therefore, the heat dissipation pad 28A and the sealing member 29 can be provided at a predetermined position on the stator assembly 2 without moving the stator assembly 2 as a part of the motor assembly 200, and the diffuser plate 40 and the compressor housing 12 can be moved and assembled thereon, thereby improving the workability.

[0054] As another method of manufacturing the electric supercharger 1 , the motor assembly 200 may be provided so that the rotation axis S is inclined relative to the vertical direction, and the heat sink 28A, the sealing member 29 , the diffuser plate 40 , etc. may be assembled laterally to the motor assembly 200 to manufacture the electric supercharger 1 .

[0055] Next, the function and effect of the electric supercharger 1 will be described. Since the motor 20 of the electric supercharger 1 becomes a heat source, it is necessary to remove heat appropriately. The electric supercharger 1 is provided with a heat dissipation component 28 between the diffuser plate 40 and the stator 22. That is, the heat from the stator 22 is transferred to the diffuser plate 40 via the heat dissipation component 28. Therefore, compared with the method in which the heat dissipation component 28 is not provided, the heat removal performance can be improved. In addition, a sealing component 29 is provided between the diffuser plate 40 and the stator 22, and the sealing component 29 is provided between the heat dissipation component 28 and the rotating shaft S. Therefore, it is possible to prevent the gas around the rotating shaft S or near the rotor 21 from affecting the heat dissipation component 28 by reaching the heat dissipation component 28 between the diffuser plate 40 and the stator 22.

[0056] The seal groove 22e is formed in the stator 22 of the present disclosure. By accommodating the seal member 29 in the seal groove 22e, the seal member 29 can be installed at an appropriate position.

[0057] The stator 22 of the present disclosure includes a heat dissipation component installation portion 22c for installing the heat dissipation component 28, and a head portion 22d protruding from the heat dissipation component installation portion 22c. A sealing groove 22e for accommodating the sealing component 29 is formed in the head portion 22d. The head portion 22d is received by the recessed portion 41b of the diffuser plate 40. It is necessary to ensure electrical insulation between the diffuser plate 40 and the coil 2a of the stator 22. Since the sealing groove 22e is formed in the head portion 22d protruding from the heat dissipation component installation portion 22c, the sealing groove 22e can be formed at a position away from the coil 22a than the heat dissipation component installation portion 22c. As a result, it is easy to ensure electrical insulation between the diffuser plate 40 and the coil 22a.

[0058] The heat dissipation component 28 of the present disclosure is a heat dissipation pad 28A. When the heat dissipation pad 28A is set in the heat dissipation component setting portion 22c, it already has a predetermined shape, has high shape stability, and is easy to handle. Therefore, according to the heat dissipation pad 28A, it is easy to set it to a predetermined position (appropriate position).

[0059] In addition, the head portion 22d of the present disclosure functions as a positioning portion of the heat dissipation pad 28A. That is, by interfering with the head portion 22d and providing the heat dissipation pad 28A along the head portion 22d, the heat dissipation pad 28A can be easily arranged at an appropriate position.

[0060] In the present disclosure, the heat dissipating member 28 is disposed between the cooling water flow path F3 of the diffuser plate 40 and the stator 22. Therefore, the heat from the stator 22 is easily transferred to the cooling water flow path F3 via the heat dissipating member 28.

[0061] The heat dissipation member 28 of the present disclosure has a higher thermal conductivity than the resin portion 22b included in the stator 22, but lower thermal conductivity than the diffuser plate 40. Heat is easily transferred from the resin portion 22b of the stator 22 to the heat dissipation member 28 and from the heat dissipation member 28 to the diffuser plate 40, thereby improving heat removal performance.

[0062] The heat dissipation pad 28A of the present disclosure is thinner than the diffuser plate 40. By making the heat dissipation pad 28A thinner than the diffuser plate 40, the heat removal performance from the stator 22 to the diffuser plate 40 can be improved.

[0063] Starting from the above examples, the present disclosure can be implemented in various ways with various changes and improvements based on the knowledge of those skilled in the art. In addition, the technical matters recorded in the above examples can also be used to form modified examples. The structures of each example can be appropriately combined for use.

[0064] For example, the condition that a heat dissipation member is disposed between the cooling water flow path of the diffuser plate and the stator is set as the first condition, the condition that the heat dissipation member has a higher thermal conductivity than the stator and lower thermal conductivity than the diffuser plate is set as the second condition, and the condition that the thickness of the heat dissipation pad is thinner than the thickness of the diffuser plate from the first end surface to the second end surface is set as the third condition. Here, in the above-mentioned examples of the present disclosure, it may be an electric supercharger that satisfies the first and second conditions, an electric supercharger that satisfies the first and third conditions, or an electric supercharger that satisfies the second and third conditions.

[0065] Description of reference numerals:

[0066] 1…electric supercharger; 12…compressor housing; 14…vortex flow path; 15…diffuser flow path; 20…motor; 21…rotor; 22…stator; 22b…resin portion; 22c…heat dissipation component setting portion; 22d…head portion (sealing component setting portion, positioning portion); 22e…sealing groove; 22v…sealing groove; 22w…sealing component setting portion; 22x…head portion (sealing component setting portion); 22y…protruding wall (positioning portion); 22z…protruding wall (positioning portion); 27…motor housing; 28…heat dissipation component; 28A…heat dissipation pad; 29…sealing component; 40…diffuser plate; 41b…recess; F3…cooling water flow path; S…rotating shaft.

Claims

1. An electric supercharger comprising: a motor housing for accommodating a motor, a compressor housing having a scroll flow path, and a diffuser plate disposed between the motor housing and the compressor housing, wherein: have: a rotor fixed to the rotating shaft; a stator fixed to the motor housing; a heat dissipation component disposed between the diffuser plate and the stator; and A sealing member is disposed between the diffuser plate and the stator, and between the heat dissipating member and the rotating shaft.

2. The electric supercharger according to claim 1, characterized in that: The stator is formed with a sealing groove that receives the sealing member and contacts the sealing member.

3. The electric supercharger according to claim 2, characterized in that: The stator has: a heat dissipation component installation portion, on which the heat dissipation component is installed; and a sealing member installation portion which is opposed to the diffuser plate and protrudes from the heat dissipation member installation portion and is formed with the sealing groove, The diffuser plate is formed with a recessed portion that receives the sealing member installation portion and contacts the sealing member.

4. The electric supercharger according to claim 1, characterized in that: The heat dissipation component is a heat dissipation pad having a predetermined shape.

5. The electric supercharger according to claim 4, characterized in that: The stator has: a heat dissipation component setting portion, on which the heat dissipation pad is set; and A positioning portion protrudes from the heat dissipation component installation portion and positions the heat dissipation pad.

6. The electric supercharger according to claim 1, characterized in that: A cooling water flow path through which cooling water flows is formed in the diffuser plate. The heat dissipation member is arranged between the cooling water flow path and the stator.

7. The electric supercharger according to claim 1, characterized in that: The stator includes a resin portion, The heat dissipation member has a thermal conductivity higher than that of the resin portion and lower than that of the diffuser plate.

8. The electric supercharger according to claim 1, characterized in that: The heat dissipation component is a heat dissipation pad, The diffuser plate includes: a first end surface in contact with the heat dissipation pad, and a second end surface forming a diffuser flow path on a side opposite to the first end surface. The heat dissipation pad has a thickness thinner than a thickness of the diffuser plate from the first end surface to the second end surface.

9. An electric supercharger, characterized in that: have: A motor having a rotor and a stator; a rotating shaft which is rotated by the driving of the motor; an impeller fixed to the rotating shaft; a compressor housing housing the impeller; a diffuser plate fixed to the compressor housing; a heat dissipation layer disposed between the diffuser plate and the stator; as well as A sealing portion is disposed between the diffuser plate and the stator and between the heat dissipation layer and the rotating shaft to restrict passage of gas.

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