An electric pump

Abstract

This invention relates to an electric pump, which includes a pump cover, a motor housing, and a pump rotor. The pump cover and the motor housing are fixedly connected. The electric pump includes a sealing part, and the motor housing includes a partition part. The partition part includes a first opening, which includes a first front end and a first rear end. Along the rotation direction of the pump rotor, the radial width of the first opening increases from the first front end to the first rear end. At least a portion of the sealing part is located radially outside the first opening. The electric pump includes a main flow channel, which includes an outflow channel. The outflow channel includes a first flow portion, and the wall corresponding to the first flow portion includes a first wall and a second wall. The sealing part includes a first end and a second end. In the circumferential direction of the electric pump, the sealing part is located between the first wall and the second wall, and the first end is located between the first front end and the first wall, while the second end is located between the first rear end and the second wall. This application is advantageous because the sealing part can adapt to the main flow channel at different positions.

Description

Technical Field

[0001] This application relates to the fields of lubrication and / or refrigeration, and more particularly to an electric pump for vehicles. Background Technology

[0002] An electric pump includes a pump cover, a main flow channel, a sealing part, a pump rotor, and a motor housing. The sealing part includes a receiving part and a sealing ring located in the receiving part. After the pump cover is fixedly connected to the motor housing, it forms a pump chamber and a receiving part. The pump rotor is located in the pump chamber. The main flow channel includes an inlet channel and an outlet channel. When the electric pump is working, the working medium enters the pump chamber from the inlet channel and leaves the pump chamber from the outlet channel. The electric pump is installed in a mounting body. If the mounting body is different, the positions of the inlet channel and the outlet channel may be different. At least part of the sealing ring is located between the pump cover and the motor housing. When the outlet channel has an opening on the outer wall of the pump cover and / or on the outer wall of the motor housing, and the sealing part surrounds the entire outer circumference of the pump rotor, because part of the sealing ring is not pressed by the pump cover or the motor housing, the sealing ring may fall off from the sealing groove under pressure, making the sealing part incompatible with the main flow channel. Summary of the Invention

[0003] This application provides an electric pump that allows the sealing part to be adapted to the main channel in different positions.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] An electric pump includes a pump cover, a motor housing, a pump rotor, and a motor rotor. The pump cover and the motor housing are fixedly connected. The electric pump includes a sealing portion, at least a portion of which is located between the pump cover and the motor housing in the axial direction of the electric pump. The motor housing includes a partition portion, in the axial direction of the electric pump, with the pump rotor located on one side of the partition portion and the motor rotor located on the other side. The partition portion includes a first opening, which is recessed relative to the upper surface of the partition portion. The first opening includes a first front end portion and a first rear end portion, extending from the first front end portion along the rotation direction of the pump rotor. Towards the first rear end, the radial width of the first opening increases, and at least part of the sealing portion is located radially outside the first opening. The electric pump includes a main flow channel, which includes an outlet channel. The outlet channel includes a first flow portion having an outlet of the electric pump. The wall corresponding to the first flow portion includes a first wall and a second wall. The sealing portion includes a first end and a second end. In the circumferential direction of the electric pump, the sealing portion is located between the first wall and the second wall, and the first end is located between the first front end and the first wall, and the second end is located between the first rear end and the second wall.

[0006] In the above technical solution, at least a portion of the sealing part is located between the pump cover and the motor housing. The outflow channel includes a first flow section, which has an outlet of the electric pump. The first flow section includes a first wall and a second wall. The sealing part includes a first end and a second end. In the circumference of the electric pump, the sealing part is located between the first wall and the second wall, and at least a portion of the first end is located between the first front end and the first wall, and at least a portion of the second end is located between the first rear end and the second wall. Since there is a gap between the first end and the first wall, and a gap between the second end and the second wall, when the position of the outflow channel changes, the sealing part can seal the connection between the pump cover and the motor housing at both ends of the first flow section, ensuring the sealing of the chamber formed after the connection between the pump cover and the motor housing. This facilitates the sealing part to adapt to different mainstream channels. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the electric pump of this application;

[0008] Figure 2 for Figure 1 A cross-sectional schematic diagram of one embodiment of the electric pump shown;

[0009] Figure 3 for Figure 1 A cross-sectional schematic diagram of another embodiment of the electric pump shown;

[0010] Figure 4 for Figure 2 A schematic diagram of the first embodiment of the assembly of the motor housing, pump rotor, and sealing parts;

[0011] Figure 5 for Figure 2 A schematic diagram of the second embodiment of the assembly of the motor housing, pump rotor, and sealing parts;

[0012] Figure 6 for Figure 2 A schematic diagram of the third embodiment of the assembly of the motor housing, pump rotor, and sealing parts;

[0013] Figure 7 for Figure 4 A schematic diagram of the projection of the main channel, motor housing, and seals onto a plane perpendicular to the central axis of the electric pump.

[0014] Figure 8 for Figure 4 A schematic diagram of the projection of the motor housing, pump rotor, and seals onto a plane perpendicular to the central axis of the electric pump.

[0015] Figure 9 for Figure 7 or Figure 8 A schematic diagram of the motor housing;

[0016] Figure 10 for Figure 7 or Figure 8 Schematic diagram of the pump cover;

[0017] Figure 11 for Figure 2 A schematic diagram of another embodiment of the pump cover;

[0018] Figure 12 for Figure 2 A schematic diagram of another embodiment of the motor housing;

[0019] Figure 13 for Figure 1 A schematic diagram from a first perspective of one embodiment of the pump cover;

[0020] Figure 14 for Figure 13 A schematic diagram of the pump cover from a second perspective.

[0021] Reference numerals: 1. Pump housing; 11. Pump cover; 11a. Main flow channel; 111. Inlet channel; 112. Outlet channel; 113. First flow section; 1131. First wall; 1132. Second wall; 1133. Outlet; 114. Second flow section; 115. First end face; 116. Second end face; 12. Motor housing; 121. Separator; 1211. First opening; 1212. First front end; 1213. First rear end; 1214. First inner wall; 1215. Second inner wall; 122. Reinforcing part; 13. Bottom cover; 2. Sealing part; 21. Sealing element; 211. Positioning hole; 212. Main body; 213. 214. Protrusion; 22. Limiting groove; 22. Sealing groove; 221. Bottom wall; 222. First side wall; 223. Second side wall; 224. First sealing groove; 225. Second sealing groove; 226. First sealing sub-groove; 227. Second sealing sub-groove; 23. First end; 24. Second end; 25. Positioning part; 4. Pump rotor; 41. Inner rotor; 411. First mating part; 412. Second mating part; 42. Outer rotor; 43. Hydraulic chamber; 431. Low-pressure chamber; 432. High-pressure chamber; 5. Stator assembly; 51. Stator core; 52. Winding; 6. Motor rotor; 7. Pump shaft; 8. Electrical control assembly; 10. Pump chamber; 20. Motor chamber. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this application, further detailed descriptions are provided below. Obviously, the accompanying drawings described below are merely some embodiments of this application. For those skilled in the art, other technical solutions can be obtained based on these solutions without any creative effort.

[0023] Electric pumps can be applied to automotive lubrication and / or cooling systems, providing circulating power for the working medium in these systems, which in turn provide lubricating oil and / or cooling oil to the transmission system. In this application, "A and B fixed connection" means that there is no relative displacement between A and B after the connection, such as A and B being welded together; "A and B limiting connection" means that A restricts B's movement in a certain direction, or B restricts A's movement in a certain direction.

[0024] Please refer to Figures 1 to 14The electric pump includes a pump housing 1, which includes a pump cover 11 and a motor housing 12. The pump cover 11 is fixedly connected to the motor housing 12, for example, by screws or bolts. Alternatively, the pump cover 11 and motor housing 12 can be connected by other methods, such as plug-in or snap-fit ​​connections. Referring to the figure, the electric pump also includes a bottom cover 13, which is fixedly connected to the motor housing 12, for example, by screws or bolts. This connection facilitates easy assembly and disassembly of the electric pump. The electric pump includes a pump rotor 4, a stator assembly 5, a motor rotor 6, a pump shaft 7, and an electrical control assembly 8. The motor rotor 6 is located radially inside the stator assembly 5 and is drively connected to the pump rotor 4. The pump rotor 4 includes an inner rotor 41 and an outer rotor 42. The inner rotor 41 includes multiple external teeth, and the outer rotor 42 includes multiple internal teeth. The outer rotor 42 is located on the outer periphery of the inner rotor 41, and the inner rotor 41 and the outer rotor 42 are internally meshed. In other embodiments, the inner rotor 41 and the outer rotor 42 are externally meshed, in which case the outer rotor 42 and the inner rotor 41 are arranged side by side. In this embodiment, the central axis of the outer rotor 42 is offset from the central axis of the inner rotor 41, that is, there is a certain eccentricity between the central axis of the outer rotor 42 and the central axis of the inner rotor 41. When the inner rotor 41 rotates, at least some of the external teeth of the inner rotor 41 mesh with at least some of the internal teeth of the outer rotor 42, thereby enabling the inner rotor 41 to drive the outer rotor 42 to rotate. The stator assembly 5 includes a stator core 51 and windings 52. When the electric pump is working, the electronic control assembly 8 controls the current in the windings 52 of the stator assembly 5 to change according to a predetermined pattern, thereby controlling the stator assembly 5 to generate a changing excitation magnetic field. The motor rotor 6 rotates under the action of the excitation magnetic field. The motor rotor 6 can directly or indirectly drive the pump rotor 4 to rotate. In this embodiment, the pump shaft 7 is drivenly connected to the pump rotor 4 and the motor rotor 6. Specifically, one end of the pump shaft 7 is drivenly connected to the inner rotor 41, and the other end of the pump shaft 7 is drivenly connected to the motor rotor 6. The motor rotor 6 drives the inner rotor 41 to rotate through the pump shaft 7, thereby realizing the rotation of the pump rotor 4. It should be noted that the axial direction of the electric pump here and below is the direction of axial extension of the pump shaft 7, the central axis of the electric pump is the central axis of the pump shaft 7, the radial direction of the electric pump is the direction perpendicular to the axial direction of the electric pump, "radial outer" is the direction away from the central axis of the pump shaft 7, and "radial inner" is the direction close to the central axis of the pump shaft 7.

[0025] As described in the background art, when the sealing part surrounds the entire outer circumference of the pump rotor, since some of the sealing rings are not pressed by the pump cover or motor housing, the high-pressure fluid flowing out from the main channel will flow along the receiving part towards the area corresponding to the low-pressure chamber, causing leakage at the connection between the pump cover and the motor housing corresponding to the low-pressure chamber, thereby reducing the pump efficiency.

[0026] Please refer to Figures 1 to 14 The electric pump includes a sealing portion 2. In the axial direction of the electric pump, at least a portion of the sealing portion 2 is located between the pump cover 11 and the motor housing 12. The motor housing 12 includes a partition portion 121. In the axial direction of the electric pump, the pump rotor 4 is located on one side of the partition portion 121, and the motor rotor is located on the other side of the partition portion 121. The partition portion 121 includes a first opening 1211, which is recessed relative to the upper surface of the partition portion 121. The first opening 1211 includes a first front end portion 1212 and a first rear end portion 1213. Along the rotation direction of the pump rotor 4, from the first front end portion 1212 to the first rear end portion 1213, the radial width of the first opening 1211 increases. At least a portion of the sealing portion 2 is located... Radially outside the first opening 1211, the electric pump includes a main flow channel 11a, which includes an outlet channel 112. The outlet channel 112 includes a first flow section 113, which has an outlet 1133 of the electric pump. The wall corresponding to the first flow section 113 includes a first wall 1131 and a second wall 1132. The sealing part 2 includes a first end 23 and a second end 24. In the circumferential direction of the electric pump, the sealing part 2 is located between the first wall 1131 and the second wall 1132, and at least a portion of the first end 23 is located between the first front end 1212 and the first wall 1131, and at least a portion of the second end 24 is located between the first rear end 1213 and the second wall 1132. Since there is a gap between the first end 23 and the first wall 1131, and a gap between the second end 24 and the second wall 1132, when the position of the outflow channel 112 changes, the sealing part 2 can seal the connection between the pump cover 11 and the motor housing 12 at both ends of the first flow section 113, ensuring the sealing of the chamber formed after the pump cover 11 and the motor housing 12 are connected, which is beneficial for the sealing part 2 to adapt to different arrangements of the main flow channel 11a.

[0027] In one embodiment, please refer to Figure 4 and Figure 6 The sealing part 2 includes a sealing element 21 and a sealing groove 22. At least a portion of the sealing element 21 is located in the sealing groove 22. The groove wall of the sealing groove 22 includes a first side wall 222 and a second side wall 223. The sealing element 21 is an elastic element. The first end 23 includes a positioning part 25, and the second end 24 includes a positioning part 25. In the radial direction of the electric pump, the positioning part 25 is located between the first side wall 222 and the second side wall 223, and the positioning part 25 is clearance-fitted with the sealing element 21. During the operation of the electric pump, the sealing element 21 may shift due to vibration. Limiting the sealing element 21 at both ends helps to fix the sealing element 21. In addition, since the sealing element 21 is an elastic element, for example, the material of the sealing element is rubber, the two ends of the sealing element 21 may shrink, causing a gap at the connection between the pump cover 11 and the motor housing 12, which may cause leakage of the working medium in the pump chamber 10. Limiting the sealing element 21 at both ends helps to prevent the sealing element 21 from shrinking. Please refer to Figure 5 The sealing groove 22 has a bottom wall 221. In the radial direction of the electric pump, the bottom wall 221 is located between the first side wall 222 and the second side wall 223. A positioning part 25 extends from the bottom wall 221 in a direction away from the bottom wall 221. The sealing member 21 has a positioning hole 211, and the positioning part 25 is clearance-fitted with the positioning hole 211. (Please refer to...) Figure 3 The sealing element 21 has a limiting groove 214, and the positioning part 25 is clearance-fitted with the groove wall of the limiting groove 214. The sealing element 21 is limited at both ends using the above method, which is a simple limiting method. In one embodiment, please refer to... Figure 5 The seal 21 includes a main body 212 and a protrusion 213. A first end 23 includes the protrusion 213, and a second end 24 includes the protrusion 213. The protrusion 213 extends from the main body 212 in a direction away from the pump rotor 4. The sealing groove 22 includes a first sealing groove 224 and a second sealing groove 225. The main body 212 is located in the first sealing groove 224, and the protrusion 213 is located in the second sealing groove 225. The manufacturing processes of the sealing groove 22 and the seal 21 are simple, and the manufacturing cost is relatively low.

[0028] Please refer to Figures 4 to 6 The electric pump includes a pump chamber 10. The chamber wall forming the pump chamber 10 includes at least a portion of the inner wall of the pump cover 11 and at least a portion of the inner wall of the motor housing 12. The pump rotor 4 is located in the pump chamber 10. In the radial direction of the electric pump, the first sidewall 222 is closer to the central axis of the electric pump than the second sidewall 223. The distance from the first sidewall 222 to the chamber wall of the pump chamber 10 is greater than or equal to 2 mm. Since the pump chamber 10 is a pressure chamber, the distance from the first sidewall 222 to the chamber wall of the pump chamber 10 greater than or equal to 2 mm helps to prevent the sealing groove 22 from being damaged by the radial force generated by the working medium. Please refer to... Figure 2 The pump cover 11 or the motor housing 12 has a sealing groove 22. Machining the sealing groove 22 on a single component results in smaller cumulative tolerances and better sealing performance; or, please refer to... Figure 3 The sealing groove 22 includes a first sealing groove 226 and a second sealing groove 227. The pump cover 11 has the first sealing groove 226, and the motor housing 12 has the second sealing groove 227. The first sealing groove 226 and the second sealing groove 227 are respectively machined on the pump cover 11 and the motor housing 12. In the axial direction of the electric pump, the wall thickness of the pump cover 11 and the motor housing 12 can be smaller, which is beneficial to reducing the axial height of the electric pump. The sealing element 21 accommodated in the sealing groove 22 can be any type of sealing member, as long as the sealing element 21 contacts the pump cover 11 and the motor housing 12. The sealing element 21 can be an O-ring seal, or a ring-shaped sealing component other than an O-ring, such as an X-ring, a liquid gasket, or an adhesive.

[0029] Please refer to Figure 7 , Figure 8 , Figure 9 and Figure 12 The electric pump includes a hydraulic chamber 43 located between the inner rotor 41 and the outer rotor 42. The pump chamber 10 includes the hydraulic chamber 43, which includes a low-pressure chamber 431 connected to the first opening 1211. The connection between the pump cover 11 and the motor housing 12 corresponding to the low-pressure chamber 431 can be sealed by the sealing part 2, which helps ensure the sealing performance of the pump chamber 10 and thus improves pump efficiency. In one embodiment, please refer to... Figure 12 The first opening 1211 is a groove, recessed relative to the upper surface of the partition 121. When the electric pump is operating, the first opening 1211 can contain the working medium, which helps reduce the friction between the pump rotor 4 and the partition 121. In one embodiment, please refer to... Figure 8 The first opening 1211 is a channel that penetrates the upper and lower surfaces of the partition 121 and connects to the low-pressure chamber 431. The electric pump includes a motor chamber 20, with the motor rotor 6 located in the motor chamber 20. The first opening 1211 connects to the motor chamber 20. When the electric pump is working, the working medium in the pump chamber 10 can flow into the motor chamber 20 through the first opening 1211, which helps to increase the flow rate of the working medium entering the motor chamber 20 per unit time, thereby improving the pressure on the motor chamber 20. The heat dissipation effect of the stator assembly 5 of 0, the wall corresponding to the first opening 1211 includes a first inner wall 1214 and a second inner wall 1215. In the radial direction of the electric pump, the first inner wall 1214 is closer to the central axis of the electric pump than the second inner wall 1215. The motor housing 12 includes a reinforcing part 122, which extends from the first inner wall 1214 to the second inner wall 1215. The working medium enters the motor cavity 20 from the first opening 1211. The reinforcing part 122 helps to improve the impact resistance of the working medium to the partition 121.

[0030] In one embodiment, please refer to Figure 10 and Figure 11 The outflow channel 112 includes a second flow section 114, and the hydraulic chamber 43 includes a high-pressure chamber 432, which communicates with the second flow section 114. The pump cover 11 includes a first end face 115. In the radial direction of the electric pump, the wall corresponding to the first flow section 113 extends from the wall corresponding to the second flow section 114 away from the central axis of the electric pump. The second flow section 114 is recessed from the first end face 115. The first flow section 113 has an outlet 1133 on the outer peripheral wall of the pump cover 11. The first end face 115 contacts the motor housing 112; or, in the axial direction of the electric pump, there is a gap between the first end face 115 and the motor housing 112. The working medium can flow out from the first flow section 113 in the radial direction of the electric pump. The electric pump is installed in the mounting body and can match the installation requirements of the mounting body. In one embodiment, please refer to... Figure 13 and Figure 14 The outflow channel 112 includes a second flow section 114, and the hydraulic chamber 43 includes a high-pressure chamber 432, which communicates with the second flow section 114. The pump cover 11 has a first end face 115, and the second flow section 114 is recessed from the first end face 115. In the axial direction of the electric pump, the wall corresponding to the first flow section 113 extends away from the wall corresponding to the second flow section 114 in a direction away from the pump rotor 4. The first flow section 113 has an outlet 1133 on the second end face 116 of the pump cover 11. In the axial direction of the electric pump, the first end face 115 is closer to the pump rotor 4 than the second end face 116. The working medium can flow out from the first flow section 113 along the axial direction of the electric pump. The electric pump is installed in the mounting body and can match the installation requirements of the mounting body. The main flow channel 11a includes an inflow channel 111, which communicates with the low-pressure chamber 431. The inflow channel 111 has an opening on the first end face 115. When the electric pump is working, the working medium enters the low-pressure chamber 431 from the opening.

[0031] The above examples illustrate the principles and implementation methods of this application. The descriptions of the embodiments are merely for the purpose of helping to understand the methods and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. An electric pump, characterized in that, The electric pump includes a pump cover (11), a motor housing (12), a pump rotor (4), and a motor rotor (6). The pump cover (11) and the motor housing (12) are fixedly connected. The electric pump includes a sealing part (2), and at least a portion of the sealing part (2) is located between the pump cover (11) and the motor housing (12) in the axial direction of the electric pump. The motor housing (12) includes a partition (121), and the pump rotor (4) is located in the partition (121) in the axial direction of the electric pump. 1) On one side, the motor rotor is located on the other side of the partition (121). The partition (121) includes a first opening (1211), which is recessed relative to the upper surface of the partition (121). The first opening (1211) includes a first front end (1212) and a first rear end (1213), extending from the first front end (1212) to the first rear end (1213) along the rotation direction of the pump rotor (4). The radial width of the opening (1211) is increased, and at least part of the sealing part (2) is located radially outside the first opening (1211). The electric pump includes a main flow channel (11a), which includes an outlet channel (112). The outlet channel (112) includes a first flow portion (113), which has an outlet (1133) of the electric pump. The wall corresponding to the first flow portion (113) includes a first wall (1131) and a second wall (1133). The sealing part (2) includes a first end (23) and a second end (24) in the circumferential direction of the electric pump. The sealing part (2) is located between the first wall (1131) and the second wall (1132), and at least part of the first end (23) is located between the first front end (1212) and the first wall (1131), and at least part of the second end (24) is located between the first rear end (1213) and the second wall (1132).

2. The electric pump according to claim 1, characterized in that, The sealing part (2) includes a sealing element (21) and a sealing groove (22). At least a portion of the sealing element (21) is located in the sealing groove (22). The groove wall of the sealing groove (22) includes a first side wall (222) and a second side wall (223). The sealing element (21) is an elastic element. The first end (23) includes a positioning part (25), and the second end (24) includes a positioning part (25). In the radial direction of the electric pump, the positioning part (25) is located between the first side wall (222) and the second side wall (223). The positioning part (25) is clearance-fitted with the sealing element (21).

3. The electric pump according to claim 2, characterized in that, The sealing groove (22) has a bottom wall (221) in the radial direction of the electric pump, the bottom wall (221) being located between the first side wall (222) and the second side wall (223), the positioning part (25) extending from the bottom wall (221) in a direction away from the bottom wall (221), the sealing member (21) having a positioning hole (211), the positioning part (25) being clearance-fitted with the positioning hole (211); or, the sealing member (21) having a limiting groove (214), the positioning part (25) being clearance-fitted with the groove wall of the limiting groove (214).

4. The electric pump according to claim 2, characterized in that, The seal (21) includes a main body (212) and a protrusion (213). The first end (23) includes the protrusion (213), and the second end (24) includes the protrusion (213). The protrusion (213) extends from the main body (212) in a direction away from the pump rotor (4). The sealing groove (22) includes a first sealing groove (224) and a second sealing groove (225). The main body (212) is located in the first sealing groove (224), and the protrusion (213) is located in the second sealing groove (225).

5. The electric pump according to any one of claims 1-4, characterized in that, The pump cover (11) has the sealing groove (22); or, the motor housing (12) has the sealing groove (22); or, the sealing groove (22) includes a first sealing groove (226) and a second sealing groove (227), the pump cover (11) has the first sealing groove (226), and the motor housing (12) has the second sealing groove (227).

6. The electric pump according to any one of claims 2-5, characterized in that, The sealing groove (22) includes a first sidewall (222) and a second sidewall (223). In the radial direction of the electric pump, the first sidewall (222) is closer to the central axis of the electric pump than the second sidewall (223). The electric pump includes a pump chamber (10). The cavity wall forming the pump chamber (10) includes at least a portion of the inner wall of the pump cover (11) and at least a portion of the inner wall of the motor housing (12). The distance from the first sidewall (222) to the cavity wall of the pump chamber (10) is greater than or equal to 2 mm.

7. The electric pump according to any one of claims 1-6, characterized in that, The pump rotor (4) includes an inner rotor (41) and an outer rotor (42). The outer rotor (42) is located on the outer periphery of the inner rotor (41). The electric pump includes a hydraulic chamber (43) located between the inner rotor (41) and the outer rotor (42). The hydraulic chamber (43) includes a low-pressure chamber (431) which communicates with the first opening (1211).

8. The electric pump according to claim 7, characterized in that, The first opening (1211) is a groove, and the first opening (1211) is recessed relative to the upper surface of the partition (121); or, the first opening (1211) is a channel, and the first opening (1211) penetrates the upper and lower surfaces of the partition (121). The electric pump includes a motor cavity (20), the motor rotor (6) is located in the motor cavity (20), and the first opening (1211) communicates with the motor cavity (20).

9. The electric pump according to claim 7 or 8, characterized in that, The pump cover (11) includes a first end face (115), the outlet channel (112) includes a second flow portion (114), the hydraulic chamber (43) includes a high-pressure chamber (432), the high-pressure chamber (432) communicates with the second flow portion (114), in the radial direction of the electric pump, the wall corresponding to the first flow portion (113) extends from the wall corresponding to the second flow portion (114) away from the central axis of the electric pump, the second flow portion (114) is recessed from the first end face (115), the first flow portion (113) has the outlet (1133) on the outer peripheral wall of the pump cover (11), the first end face (115) contacts the motor housing (112); or, in the axial direction of the electric pump, there is a gap between the first end face (115) and the motor housing (112).

10. The electric pump according to claim 7 or 8, characterized in that, The outflow channel (112) includes a second flow section (114), the hydraulic chamber (43) includes a high-pressure chamber (432), the high-pressure chamber (432) communicates with the second flow section (114), the pump cover (11) has a first end face (115), the second flow section (114) is recessed from the first end face (115), in the axial direction of the electric pump, the wall corresponding to the first flow section (113) extends from the wall corresponding to the second flow section (114) in a direction away from the pump rotor (4), the first flow section (113) has the outlet (1133) on the second end face (116) of the pump cover (11), in the axial direction of the electric pump, the first end face (115) is closer to the pump rotor (4) relative to the second end face (116).

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