Electric supercharger

Abstract

The present invention provides an electric supercharger comprising: a motor casing that houses a motor; a compressor casing provided with a scroll flow path; and a diffuser plate disposed between the motor casing and the compressor casing. This electric supercharger comprises: a rotor secured to a rotation axis; a motor stator secured to the motor casing; a heat dissipation member disposed between the diffuser plate and the stator; and a seal member that is disposed between the diffuser plate and the stator and that is disposed between the heat dissipation member and the rotation axis.

Description

Technical Field

[0001] This disclosure relates to an electric supercharger.

Background Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The motor that rotates the impeller is a heat source. In order to maintain the performance of the motor, it is necessary to improve the heat extraction property (cooling property) for discharging the heat generated in the motor to the outside of the motor.

[0005] This disclosure describes an electric supercharger that can improve the heat extraction property for discharging the heat generated in the motor to the outside of the motor.

Means for Solving the Problems

[0006] An example of an electric supercharger in this disclosure is an electric supercharger comprising a motor casing for housing a motor, a compressor casing having a scroll flow path, and a diffuser plate disposed between the motor casing and the compressor casing. This electric supercharger comprises a rotor fixed to a rotating shaft, a motor stator fixed to the motor casing, a heat dissipation member disposed between the diffuser plate and the stator, and a sealing member disposed between the diffuser plate and the stator, and also disposed between the heat dissipation member and the rotating shaft.

[0007] In this electric supercharger, a heat dissipation member is positioned between the diffuser plate and the stator. Since heat from the stator is transferred to the diffuser plate via the heat dissipation member, heat dissipation can be improved compared to a configuration without the heat dissipation member. Furthermore, a sealing member is positioned between the diffuser plate and the stator, and the sealing member is positioned between the heat dissipation member and the rotating shaft. Therefore, it is possible to prevent gas around the rotating shaft from passing between the diffuser plate and the stator and reaching the heat dissipation member, thereby preventing it from affecting the heat dissipation member.

[0008] In some embodiments, the stator may have a seal groove that houses and contacts a sealing member. By housing the sealing member in the seal groove, the sealing member can be positioned appropriately.

[0009] In some embodiments, the stator may include a heat dissipation member mounting section on which a heat dissipation member is installed, and a seal member mounting section facing the diffuser plate, protruding from the heat dissipation member mounting section, and having a seal groove formed therein. The diffuser plate may have a recess formed therein that receives the seal member mounting section and contacts the seal member. It is necessary to ensure electrical insulation between the diffuser plate and the stator coils. By forming a seal groove in the seal member mounting section that protrudes from the heat dissipation member mounting section, the seal groove can be formed at a position further away from the coils than the heat dissipation member mounting section, making it easier to ensure electrical insulation between the diffuser plate and the stator coils.

[0010] In some embodiments, the heat dissipation member may be a heat dissipation pad having a predetermined shape. Using a heat dissipation pad makes it easier to install the member in a predetermined location.

[0011] In some embodiments, the stator may include a heat dissipation member mounting section on which a heat dissipation pad is installed, and a positioning section that protrudes from the heat dissipation member mounting section and positions the heat dissipation pad. By interfering with the positioning section and installing the heat dissipation pad along the positioning section, it becomes easier to position the heat dissipation pad in the appropriate location.

[0012] In some embodiments, a cooling water channel is formed within the diffuser plate through which cooling water flows, and a heat dissipation member may be placed between the cooling water channel and the stator. By placing a heat dissipation member between the cooling water channel and the stator, heat from the stator is more easily transferred to the cooling water channel.

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

[0014] In some embodiments, the heat dissipation member is a heat dissipation pad, and the diffuser plate comprises a first end face in contact with the heat dissipation pad and a second end face opposite the first end face that forms a diffuser flow path, wherein the thickness of the heat dissipation pad may be thinner than the thickness of the diffuser plate from the first end face to the second end face. By making the thickness of the heat dissipation pad thinner than the thickness of the diffuser plate, the heat dissipation from the stator to the diffuser plate can be improved.

[0015] Furthermore, an electric supercharger, which is an example of the present disclosure, includes a motor equipped with a rotor and a stator, a rotating shaft that rotates by the drive of the motor, an impeller fixed to the rotating shaft, a compressor casing housing the impeller, a diffuser plate fixed to the compressor casing, a heat dissipation layer disposed between the diffuser plate and the stator, and a seal portion disposed between the diffuser plate and the stator, and also between the heat dissipation layer and the rotating shaft, which restricts the passage of gas. [Effects of the Invention]

[0016] According to this disclosure, it is possible to improve the heat dissipation performance for releasing the heat generated by the motor to the outside of the motor. [Brief explanation of the drawing]

[0017] [Figure 1] Figure 1 is a schematic cross-sectional view showing an example of an electric supercharger. [Figure 2] Figure 2 is a partially enlarged cross-sectional view of the electric supercharger shown in Figure 1. [Figure 3] Figure 3 is an exploded cross-sectional view showing the stator assembly, sealing member, heat dissipation pad, and diffuser plate shown in Figure 1 before assembly. [Figure 4] Figure 4 is a plan view of the heat dissipation pad shown in Figure 1. [Figure 5] Figure 5 is a perspective view of the stator assembly shown in Figure 1. [Figure 6]FIG. 6 is a cross-sectional view schematically showing the relationship between the diffuser plate, the heat radiating pad, the seal member, and the stator. [Figure 7] FIG. 7(a) is a cross-sectional view schematically showing an example of the diffuser plate, the heat radiating pad, the seal member, and the stator, and FIG. 7(b) is a cross-sectional view schematically showing another example of the diffuser plate, the heat radiating pad, the seal member, and the stator.

Mode for Carrying Out the Invention

[0018] Hereinafter, an example for implementing the present disclosure will be described with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are assigned to the same elements, and duplicate descriptions are omitted.

[0019] FIG. 1 is a cross-sectional view of an electric supercharger 1 according to an example of the present disclosure. FIG. 2 is an enlarged cross-sectional view showing a part of the electric supercharger 1. As shown in FIGS. 1 and 2, the electric supercharger 1 includes a compressor 10, a motor 20, and a turbine 30. The electric supercharger 1 drives the compressor 10 by a motor 20 using electric power 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, for example, to an internal combustion engine. The turbine 30 recovers, for example, exhaust gas discharged from the internal combustion engine and assists the rotation of the rotating shaft S.

[0020] The compressor 10 includes an impeller 11 and a compressor casing 12. The compressor casing 12 has a suction port 13 and a scroll flow path 14. The suction port 13 is an opening coaxial with the rotation axis S. The scroll flow path 14 is formed so as to surround the rotation axis line RL. For example, the impeller 11 is fixed to the rotation axis S and is housed inside the compressor casing 12. The impeller 11 is arranged on the back side of the suction port 13 when viewed from the outside of the compressor 10. The scroll flow path 14 is formed so as to surround the impeller 11. The air sucked in from the suction port 13 reaches the scroll flow path 14 through the impeller 11. A diffuser flow path 15 is formed between the impeller 11 and the scroll flow path 14. The diffuser flow path 15 receives air from the impeller 11 and delivers the air to the scroll flow path 14. The diffuser flow path 15 is formed by the wall surface of the compressor casing 12 and a diffuser plate 40 fixed to the compressor casing 12.

[0021] The motor 20 has a rotor 21 and a stator 22. The rotor 21 is fixed to the rotation axis S and rotates together with the rotation axis S. The rotor 21 includes, for example, a plurality of permanent magnets. The stator 22 is a member provided so as to surround the rotor 21. The stator 22 includes a coil 22a. The rotation axis S rotates by the drive of the motor 20.

[0022] The motor 20 is housed in a motor casing 27. The motor casing 27 includes a stator case 23, a pass block 24, and an outer case 25. The stator case 23 houses the stator 22. The pass block 24 is fixed to the stator case 23. The outer case 25 is provided so as to surround the stator case 23 and the pass block 24.

[0023] The stator case 23 is cylindrical in shape, and the stator 22 is fixed inside it. The stator 22 comprises a coil 22a wound around teeth and a resin portion 22b that is filled inside the stator case 23 and surrounds the coil 22a. The resin portion 22b is made of a thermosetting resin.

[0024] The stator case 23 has one end facing the diffuser plate 40, and this end is open. The opposite end of the stator case 23 is closed by the case end face 23a. A cooling water passage F1 is formed between the case end face 23a and the outer case 25. The cooling water passage F1 is provided along the case end face 23a, and the cooling water passes through the cooling water passage F1.

[0025] A pass block 24 is attached to the outer circumference of the stator case 23. The pass block 24 is formed as a separate component from the stator case 23. A cooling water communication passage F2 is formed in the pass block 24. Note that the pass block 24 is not limited to being a separate component; for example, it may be integrated with the outer case 25.

[0026] A resin part 22b is provided inside the stator case 23. One end of the stator case 23 is open, exposing the end of the resin part 22b. The end of the resin part 22b is positioned to face the diffuser plate 40. A heat dissipation layer is placed between the resin part 22b and the diffuser plate 40. For example, a heat dissipation member 28 is placed between the resin part 22b and the diffuser plate 40.

[0027] The diffuser plate 40 is positioned between the motor casing 27 and the compressor casing 12. The diffuser plate 40 is made of a material with 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 has a first end face 40a (see Figure 3) facing the resin part 22b and a second end face 40b on the opposite side. The second end face 40b forms the diffuser flow path 15. The diffuser plate 40 is formed as a single unit without being divided from the first end face 40a to the second end face 40b.

[0028] The diffuser plate 40 has a cooling water channel F3 through which cooling water passes. The cooling water channel F3 is fluidly connected to the cooling water channel F1 of the motor casing 27 via a connecting passage F2 of the pass block 24. A heat dissipation member 28 is positioned between the cooling water channel F3 of the diffuser plate 40 and the stator 22.

[0029] Referring to Figures 3, 4, 5, and 6, the structures of the stator 22, heat dissipation member 28, and diffuser plate 40 will be described in more detail. The resin part 22b includes a heat dissipation member mounting part 22c and a neck part 22d protruding from the heat dissipation member mounting part 22c. The heat dissipation member mounting part 22c is substantially a flat surface. The heat dissipation member 28 is positioned on the heat dissipation member mounting part 22c.

[0030] The heat dissipation member 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 member 28 is, for example, greater than 2 W / mK and 10 W / mK or less. Also, the thermal conductivity of the heat dissipation member 28 is, for example, 2.5 W / mK or more and 5 W / mK or less. Also, the thermal conductivity of the heat dissipation member 28 is, for example, 3 W / mK or more and 4 W / mK or less. The thermal conductivity of the heat dissipation member 28 is, for example, higher than the thermal conductivity of the resin part 22b and lower than the thermal conductivity of the diffuser plate 40.

[0031] The heat dissipation filler is, for example, a fluid having a viscosity sufficient to maintain its shape, and is a component equipped with fine particles (fillers) such as ceramics or metals with high thermal conductivity. The heat dissipation filler hardens after being installed on the heat dissipation member installation section 22c. The heat dissipation grease is, for example, a component based on grease such as modified silicone, mixed with fine particles such as ceramics or metals with high thermal conductivity.

[0032] Figure 4 is a plan view of a heat dissipation pad 28A, which is an example of a heat dissipation member 28. The heat dissipation pad 28A is a sheet with a predetermined shape. Having a predetermined shape means that it already has a stable shape before being placed between the diffuser plate 40 and the stator 22. For example, the heat dissipation pad 28A can have a predetermined shape that follows the outer edge of the heat dissipation member installation portion 22c. Alternatively, the heat dissipation pad 28A can have a predetermined shape that allows it to be placed on the heat dissipation member installation portion 22c while avoiding the neck portion 22d. For example, the heat dissipation pad 28A has an annular (donut-shaped) form in plan view and has a circular opening 28a on the inside. The heat dissipation pad 28A is a member formed from a thin sheet of resin such as silicone or acrylic. The heat dissipation pad 28A may have a structure that includes fine particles of highly thermally conductive ceramics or metal inside. Alternatively, the heat dissipation pad 28A may be a thermal conductive sheet using graphite as the material. The heat dissipation member 28 may also be a thermal pad.

[0033] The thickness of the heat dissipation pad 28A is, for example, 0.2 mm or more and 5 mm or less. Alternatively, the thickness of the heat dissipation pad 28A can be 0.4 mm or more and 4 mm or less. Alternatively, the thickness of the heat dissipation pad 28A can be 0.3 mm or more and 3 mm or less. 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 may be thinner than the thickness of the thickest part of the thickness from the first end face 40a to the second end face 40b. Alternatively, the thickness of the heat dissipation pad 28A may be thinner than the thickness of the thinnest part of the thickness from the first end face 40a to the second end face 40b.

[0034] As shown in Figure 5, the end face of the resin portion 22b is provided with a heat dissipation member mounting portion 22c, which is an annular (donut-shaped) flat surface, and an annular (donut-shaped) neck portion 22d is provided inside the heat dissipation member mounting portion 22c. The heat dissipation member mounting portion 22c and the neck portion 22d are provided so as to face the diffuser plate 40. The neck portion 22d protrudes from the imaginary plane including the heat dissipation member mounting portion 22c. An opening is formed inside the neck portion 22d into which the rotating shaft S and rotor 21 are inserted.

[0035] A seal groove 22e is formed at the tip of the neck portion 22d, which houses a sealing member 29 such as an O-ring. The sealing member 29 is an example of a sealing portion. The sealing member 29 housed in the seal groove 22e is compressed by contact with the diffuser plate 40, and elastically deforms to perform a sealing function. The sealing function of the sealing member 29 means restricting the passage of air (gas) and effectively preventing the passage of air (gas). The sealing member 29 is arranged in the circumferential direction of the rotating shaft S so as to surround the rotating shaft S. The sealing member 29 is positioned between the heat dissipation member 28, which is placed on the heat dissipation member mounting portion 22c, and the rotating shaft S. For example, the sealing member 29 is positioned between the heat dissipation pad 28A and the rotating shaft S. The sealing member 29 prevents air (gas) present around the rotating shaft S and rotor 21 from reaching the heat dissipation member 28. The neck portion 22d is an example of a sealing member mounting portion.

[0036] The sealing member 29 is, for example, a non-metallic gasket, a semi-metallic gasket using a combination of metal and non-metallic materials, 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 jacket type gaskets or spiral wound gaskets. Metal gaskets are, for example, metal O-rings or metal plate gaskets.

[0037] As shown in Figure 3, the diffuser plate 40 has opposing portions 41 that face the end of the stator case 23 and the end of the resin portion 22b. The opposing portions 41 are provided with a peripheral wall portion 41c into which the end of the stator case 23 is inserted. Inside the peripheral wall portion 41c, there is an annular (donut-shaped) contact surface 41a that abuts against the heat dissipation member 28 and an annular (donut-shaped) recess 41b that receives the neck portion 22d. The recess 41b contacts the sealing member 29 housed in the sealing groove 22e of the neck portion 22d.

[0038] The neck portion 22d is inserted so as to fit into the central opening 28a of the heat dissipation pad 28A, thereby positioning the heat dissipation pad 28A. The neck portion 22d is an example of a positioning portion for the heat dissipation pad 28A. In this example of disclosure, the neck portion 22d performs both the function of a sealing member installation portion and a positioning portion.

[0039] As another example, a positioning section may be provided separately from the sealing member installation section. For example, as shown in Figure 7(a), a neck portion 22x (an example of a sealing member installation section) and a protruding wall 22y (an example of a positioning section) may be provided. The neck portion 22x is positioned between the heat dissipation pad 28A and the rotation shaft S, and is not in contact with the heat dissipation pad 28A. The protruding wall 22y protrudes in an annular shape so as to surround the outer edge of the heat dissipation pad 28A, and is in contact with the outer edge of the heat dissipation pad 28A to position the heat dissipation pad 28A.

[0040] As another example, as shown in Figure 7(b), a sealing member mounting portion 22w and a protruding wall 22z (an example of a positioning portion) may be provided. In this example, the sealing member mounting portion 22w is formed by providing a sealing groove 22v on substantially the same surface as the heat dissipation member mounting portion 22c without protruding from it. 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.

[0041] Next, with reference to Figures 1 and 3, a manufacturing method for assembling the components and structures to produce the electric supercharger 1 will be described. For example, the motor assembly 200 is installed in a predetermined position. In the motor assembly 200, the stator case 23 is fixed inside the motor casing 27. The coil 22a is housed inside the stator case 23, and a resin part 22b is formed to surround the coil 22a. The rotating shaft S and rotor 21 are also arranged inside the stator case 23. Furthermore, for example, a turbine 30 is assembled to the motor assembly 200.

[0042] The compressor 10 is assembled to the motor assembly 200. Since the motor assembly 200 is heavy, it is first placed in a predetermined position, and then the components of the compressor 10 are attached and assembled from above. Specifically, the motor assembly 200 is positioned vertically so that the rotation axis S is oriented in the vertical direction. In this state, the turbine 30 is located below, and the stator case 23 and stator 22 are located above. Hereinafter, the stator case 23 and stator 22 will be referred to as the stator assembly 2.

[0043] As shown in Figure 3, for example, a heat dissipation member 28 is installed on the stator assembly 2. In the case of an annular heat dissipation pad 28A, the heat dissipation pad 28A is attached so as to surround the neck portion 22d. The heat dissipation pad 28A is easily positioned by contacting the neck portion 22d, thus improving the workability of assembly.

[0044] Furthermore, a sealing member 29 is installed on the sealing groove 22e of the vertically mounted stator assembly 2. The sealing member 29 may be installed before or after the heat dissipation pad 28A is installed. Since the sealing member 29 is housed within the sealing groove 22e, it is possible to position and stably hold the sealing member 29.

[0045] The diffuser plate 40 is installed over the stator assembly 2, which has the heat dissipation pad 28A and sealing member 29 already in place. The opposing portion 41 of the diffuser plate 40 is provided with a peripheral wall portion 41c, and the upper end of the stator assembly 2 is inserted inside the peripheral wall portion 41c. The opposing portion 41 is provided with an annular recess 41b, into which the neck portion 22d is inserted. After the diffuser plate 40 is installed on the stator assembly 2, the compressor casing 12 and other components are assembled as appropriate to complete the electric supercharger 1.

[0046] As mentioned above, the motor assembly 200 is heavy. Therefore, instead of moving the stator assembly 2, which is part of the motor assembly 200, the heat dissipation pad 28A and sealing member 29 can be placed in predetermined positions on the stator assembly 2, and then the diffuser plate 40 and compressor casing 12 can be moved and mounted on top of them, thus improving work efficiency.

[0047] As an alternative manufacturing method for the electric supercharger 1, the motor assembly 200 may be installed so that the rotating shaft S is inclined with respect to the vertical direction, and the heat dissipation pad 28A, sealing member 29, diffuser plate 40, etc. may be assembled to the motor assembly 200 from the side to manufacture the electric supercharger 1.

[0048] Next, the operation and effects of the electric supercharger 1 will be explained. Since the motor 20 of the electric supercharger 1 is a heat source, it is necessary to dissipate heat appropriately. In the electric supercharger 1, a heat dissipation member 28 is placed between the diffuser plate 40 and the stator 22. In other words, heat from the stator 22 is transferred to the diffuser plate 40 via the heat dissipation member 28. Therefore, heat dissipation can be improved compared to a configuration without the heat dissipation member 28. Furthermore, a sealing member 29 is placed between the diffuser plate 40 and the stator 22, and the sealing member 29 is placed between the heat dissipation member 28 and the rotating shaft S. Therefore, it is possible to prevent gas around the rotating shaft S or near the rotor 21 from passing between the diffuser plate 40 and the stator 22 and reaching the heat dissipation member 28, thereby affecting the heat dissipation member 28.

[0049] The stator 22 of this disclosure has a seal groove 22e formed therein. By housing the seal member 29 in the seal groove 22e, the seal member 29 can be positioned in an appropriate location.

[0050] The stator 22 of this disclosure includes a heat dissipation member mounting portion 22c on which a heat dissipation member 28 is installed, and a neck portion 22d that protrudes from the heat dissipation member mounting portion 22c. A seal groove 22e for housing a seal member 29 is formed in the neck portion 22d. The neck portion 22d is received in a recess 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 seal groove 22e is formed in the neck portion 22d that protrudes from the heat dissipation member mounting portion 22c, the seal groove 22e can be formed at a position further away from the coil 22a than the heat dissipation member mounting portion 22c. As a result, it becomes easier to ensure electrical insulation between the diffuser plate 40 and the coil 22a.

[0051] The heat dissipation member 28 of this disclosure is a heat dissipation pad 28A. The heat dissipation pad 28A already has a predetermined shape and high shape stability when installed in the heat dissipation member installation section 22c, making it easy to handle. Therefore, the heat dissipation pad 28A makes it easy to install in a predetermined position (appropriate position).

[0052] Furthermore, the neck portion 22d of this disclosure functions as a positioning portion for the heat dissipation pad 28A. In other words, by interfering with the neck portion 22d and positioning the heat dissipation pad 28A along the neck portion 22d, it becomes easier to position the heat dissipation pad 28A in the appropriate location.

[0053] In this disclosure, a heat dissipation member 28 is positioned between the cooling water passage F3 of the diffuser plate 40 and the stator 22. Therefore, heat from the stator 22 is easily transferred to the cooling water passage F3 via the heat dissipation member 28.

[0054] The thermal conductivity of the heat dissipation member 28 in this disclosure is higher than that of the resin portion 22b included in the stator 22, and lower than that of the diffuser plate 40. Heat is more 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 dissipation.

[0055] The thickness of the heat dissipation pad 28A in this disclosure is thinner than the thickness of the diffuser plate 40. By making the thickness of the heat dissipation pad 28A thinner than the thickness of the diffuser plate 40, the heat dissipation from the stator 22 to the diffuser plate 40 can be improved.

[0056] This disclosure can be implemented in various forms, including the examples described above, with various modifications and improvements based on the knowledge of those skilled in the art. It is also possible to construct variations using the technical matters described in the examples above. The configurations of each example may be used in appropriate combinations.

[0057] For example, the first condition is that a heat dissipation member is placed between the cooling water passage of the diffuser plate and the stator; the second condition is that the thermal conductivity of the heat dissipation member is higher than the thermal conductivity of the stator and lower than the thermal conductivity of the diffuser plate; and the third condition is that the thickness of the heat dissipation pad is thinner than the thickness from the first end face to the second end face of the diffuser plate. Herein, in the example of the present disclosure described above, there 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, etc. [Explanation of symbols]

[0058] 1. Electric supercharger 12 Compressor casing 14 Scroll channel 15 Diffuser channel 20 motors 21 Rotors 22 stata 22b Resin part 22c Heat dissipation component mounting section 22d Neck portion (seal member installation portion, positioning portion) 22e seal groove 22V seal groove 22w sealing material installation section 22x Neck section (sealing member installation section) 22y Protruding wall (positioning part) 22z Protruding wall (positioning part) 27 Motor Casing 28 Heat dissipation components 28A Heat Dissipation Pad 29. Sealing member 40 Diffuser Plate 41b Recess F3 Cooling water flow path S rotation axis

Claims

1. An electric supercharger comprising a motor casing for housing a motor, a compressor casing with a scroll flow path, and a diffuser plate disposed between the motor casing and the compressor casing, A rotor fixed to the rotating shaft, A stator fixed to the motor casing, A heat dissipation member is disposed between the diffuser plate and the stator, An electric supercharger comprising a sealing member disposed between the diffuser plate and the stator, and disposed between the heat dissipation member and the rotating shaft.

2. The electric supercharger according to claim 1, wherein the stator houses the sealing member and has a sealing groove that contacts the sealing member.

3. The stator comprises a heat dissipation member mounting portion on which the heat dissipation member is installed, and a seal member mounting portion facing the diffuser plate, protruding from the heat dissipation member mounting portion, and having the seal groove formed therein. The electric supercharger according to claim 2, wherein the diffuser plate has a recess formed therein that receives the sealing member installation portion and contacts the sealing member.

4. The electric supercharger according to claim 1, wherein the heat dissipation member is a heat dissipation pad having a predetermined shape.

5. The electric supercharger according to claim 4, wherein the stator comprises a heat dissipation member mounting portion on which the heat dissipation pad is installed, and a positioning portion that protrudes from the heat dissipation member mounting portion and positions the heat dissipation pad.

6. A cooling water channel is formed within the diffuser plate through which cooling water flows. The electric supercharger according to claim 1, wherein the heat dissipation member is arranged between the cooling water passage and the stator.

7. The stator includes a resin part, The electric supercharger according to claim 1, wherein the thermal conductivity of the heat dissipation member is higher than that of the resin part and lower than that of the diffuser plate.

8. The heat dissipation member is a heat dissipation pad, The diffuser plate comprises a first end face in contact with the heat dissipation pad and a second end face opposite to the first end face that forms a diffuser flow path. The electric supercharger according to claim 1, wherein the thickness of the heat dissipation pad is thinner than the thickness of the diffuser plate from the first end face to the second end face.

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