An electric pump

Abstract

This application relates to an electric pump, which includes a stator assembly, an electrical control assembly, and a pin. The stator assembly includes an insulating portion and a winding. The insulating portion includes a connector, at least a portion of which is located in the winding slot. The pin includes a first electrical connection portion and a second electrical connection portion. The winding includes a first sub-winding, which is located in a slot of the connector. The first electrical connection portion is located in the slot and is electrically connected to the first sub-winding. The second electrical connection portion is electrically connected to the electrical control assembly. In the radial direction of the electric pump, the first electrical connection portion is farther from the axis of the electric pump than the second electrical connection portion, and there is a gap between the first electrical connection portion and the second electrical connection portion. This application has a better slot fill factor.

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 stator assembly, a motor housing, and pins. The stator assembly includes windings and a stator core. The stator core and the motor housing are fixedly connected. The pins are electrically connected to the windings. To enable the pins to be electrically connected to the stator assembly, the insulating part of the stator assembly has a connector for placing the pins and a winding slot for accommodating part of the windings. If the coil of the first winding of the winding breaks during stator assembly, a short circuit will occur when the wire of the first winding comes into contact with the conductive part of the motor housing. Currently, a certain insulation distance is generally set between the motor housing and the first winding. In the radial direction of the electric pump, the first winding is located between the connector and the motor housing. The slot wall of the winding slot extends from the connector away from the pin. If the connector is far from the motor housing, the slot fill factor of the electric pump may be low. Utility Model Content

[0003] The purpose of this application is to obtain an electric pump that is advantageous in achieving a better tank fill factor.

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

[0005] An electric pump includes a pin, a stator assembly, and an electrical control assembly. The stator assembly includes an insulation portion and a winding. The insulation portion includes a connector. The pin includes a first electrical connection portion and a second electrical connection portion. The winding includes a first branch winding located in a slot of the connector. At least a portion of the first electrical connection portion is located in the slot. The first electrical connection portion is electrically connected to the first branch winding. The second electrical connection portion is electrically connected to the electrical control assembly. In the radial direction of the electric pump, the first electrical connection portion is located away from the axis of the electric pump relative to the second electrical connection portion.

[0006] In the above technical solution, the pin includes a first electrical connection part and a second electrical connection part, the winding includes a first sub-winding part, the first sub-winding part is located in the slot of the connector part, the first electrical connection part is electrically connected to the first sub-winding part, and the second electrical connection part is electrically connected to the electrical control component. In the radial direction of the electric pump, the first electrical connection part is far away from the axis of the electric pump relative to the second electrical connection part, and the first electrical connection part is located in the slot of the connector part. The connector part is relatively far away from the axis of the electric pump, which can help improve the winding space of the winding and help the electric pump to have a higher slot fill factor. Attached Figure Description

[0007] Figure 1 A schematic diagram of one embodiment of an electric pump;

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

[0009] Figure 3 for Figure 2 An enlarged schematic diagram of part A in the middle;

[0010] Figure 4 for Figure 1 A cross-sectional schematic diagram of another embodiment of the electric pump shown;

[0011] Figure 5 for Figure 4 Enlarged schematic diagram of part B in the middle;

[0012] Figure 6 for Figure 1 A cross-sectional schematic diagram of another embodiment of the electric pump shown;

[0013] Figure 7 A cross-sectional schematic diagram of another embodiment of the electric pump;

[0014] Figure 8 for Figure 7 Diagram showing the fit between the center pin and the isolator;

[0015] Figure 9 for Figure 8 Schematic diagram of section AA;

[0016] Figure 10 for Figure 2 or Figure 4 or Figure 6 or Figure 7 A schematic diagram of an embodiment of the middle stator assembly;

[0017] Figure 11 for Figure 2 or Figure 4 or Figure 6 or Figure 7 A schematic diagram of another embodiment of the middle stator assembly;

[0018] Figure 12 A cross-sectional schematic diagram of another embodiment of the electric pump;

[0019] Figure 13 for Figure 12 A schematic diagram of an embodiment of the middle stator assembly;

[0020] Figure 14 This is a schematic diagram of the pins.

[0021] Reference numerals: 1. Pump housing; 11. Motor housing; 111. Fixing part; 112. Conductive part; 12. Bottom cover; 13. Isolator; 131. First positioning pin; 14. Pump cover; 15. Impeller cavity cover; 16. Housing; 2. Pin; 21. First electrical connection part; 22. Second electrical connection part; 23. Bending part; 231. First section; 232. Second section; 233. Third section; 3. Isolation sleeve; 4. Pump rotor; 41. Outer rotor; 42. Inner rotor; 5. Stator assembly; 51. Stator core; 52. Winding; 521. First sub-winding; 52 2. Second winding; 53. Insulation part; 532. Yoke insulation part; 5321. Connecting part; 53211. Inner wall; 53212. Outer wall; 53213. Groove; 5322. Connecting slot; 5323. Positioning part; 53231. Positioning hole; 53232. Second positioning post; 533. Neck insulation part; 54. Winding slot; 6. Motor rotor assembly; 61. Impeller assembly; 7. Pump shaft; 8. Electrical control assembly; 81. Circuit board; 9. Cage; 91. Main body; 92. Injection molding part; 20. First cavity; 30. Second cavity; 40. Third cavity. 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] In this application, "fixed connection between A and B" means that there is no relative displacement between A and B after the connection, such as A and B being fixed by welding; "limited connection between A and B" means that A restricts B from moving in a certain direction, or B restricts A from moving in a certain direction.

[0024] Please refer to Figures 1 to 6The electric pump 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. The electric pump includes a pump housing 1, which comprises a pump cover 14, a motor housing 11, and a bottom cover 12. The pump cover 14 is fixedly connected to the motor housing 11, for example, by screws or bolts. Alternatively, the pump cover 14 and motor housing 11 can be connected by other methods, such as plug-in or snap-fit ​​connections. The motor housing 11 is also fixedly connected to the bottom cover 12, for example, by screws or bolts, which facilitates the assembly and disassembly of the electric pump. The electric pump includes a pump rotor 4, a stator assembly 5, a motor rotor assembly 6, a pump shaft 7, and an electrical control assembly 8. The stator assembly 5 surrounds the motor rotor assembly 6 radially outside. The pump shaft 7 is drively connected to the motor rotor assembly 6. The electric pump has a first chamber 20 and a third chamber 40, which are connected. At least a portion of the electrical control assembly 8, the motor rotor assembly 6 (or at least a portion of the motor rotor assembly 6), at least a portion of the pump shaft 7, and the stator assembly 5 (or at least a portion of the stator assembly 5) are located in the first chamber 20, and the pump rotor 4 (or at least a portion of the pump rotor 4) is located in the third chamber 40. When the electric pump is working, the third chamber 40 can contain a working medium, and at least a portion of the working medium in the third chamber 40 flows into the first chamber 20. The heat generated by the stator assembly 5 during operation can be exchanged with the working medium, which is beneficial for the heat dissipation of the stator assembly 5. In addition, the electrical control assembly 8 and the stator assembly 5 are located in the same chamber, which can reduce the axial dimension of the electric pump, making the structure compact and reducing the production cost of the electric pump.

[0025] Please refer to Figures 7 to 8 , Figure 7This is a schematic diagram of another embodiment of an electric pump. The electric pump can be applied to automotive lubrication and / or cooling systems, providing circulating power for the working medium in these systems. The automotive lubrication and / or cooling systems can provide lubricating oil and / or cooling oil to the transmission system. The electric pump includes a pump housing 1, which includes a pump cover 14, a motor housing 11, a bottom cover 12, and a spacer 13. The pump cover 14 is fixedly connected to the motor housing 11, the motor housing 11 is fixedly connected to the spacer 13, and the bottom cover 12 is fixedly connected to the spacer 13. For example, the motor housing 11, the bottom cover 12, and the spacer 13 are connected by screws, which facilitates the assembly and disassembly of the electric pump. The electric pump includes a pump rotor 4, a stator assembly 5, a motor rotor assembly 6, a pump shaft 7, and an electrical control assembly 8. The stator assembly 5 is electrically connected to the electrical control assembly 8. The stator assembly 5 surrounds the motor rotor assembly 6 radially outside. The pump shaft 7 is drivenly connected to the motor rotor assembly 6. The electric pump has a first chamber 20, a second chamber 30, and a third chamber 40. The first chamber 20 and the third chamber 40 are connected, while the first chamber 20 and the second chamber 30 are not connected. The pump rotor 4 (or at least a portion of the pump rotor 4) is located in the third chamber 40. The motor rotor assembly 6 (or at least a portion of the motor rotor assembly 6), at least a portion of the pump shaft 7, and the stator assembly 5 (or at least a portion of the stator assembly 5) are located in the first chamber 20. When the electric pump is working, the third chamber 40 can contain a working medium. At least a portion of the working medium in the third chamber 40 flows into the first chamber 20. The heat generated by the stator assembly 5 during operation can be exchanged with the working medium, which is beneficial for the heat dissipation of the stator assembly 5. In addition, the electrical control assembly 8 is located in the second chamber 30, which is beneficial for the electrical control assembly 8 to be unaffected by the working medium.

[0026] Please refer to Figures 1 to 9The 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 assembly 6 rotates under the action of the excitation magnetic field. The motor rotor assembly 6 can directly or indirectly drive the pump rotor 4 to rotate. In this embodiment, the pump shaft 7 is connected to the pump rotor 4 and the motor rotor assembly 6. Specifically, one side of the pump shaft 7 is connected to the inner rotor 42, and the other side of the pump shaft 7 is connected to the motor rotor assembly 6. The motor rotor assembly 6 drives the inner rotor 42 to rotate through the pump shaft 7, thereby realizing the rotation of the pump rotor 4. The outer rotor 41 is located on the outer periphery of the inner rotor 42, and the outer rotor 41 and the inner rotor 42 are internally meshed. In other embodiments, the outer rotor 41 and the inner rotor 42 can also be externally meshed, in which case the outer rotor 41 and the inner rotor 42 are arranged side by side. In this embodiment, the central axis of the outer rotor 41 is offset from the central axis of the inner rotor 42. That is, there is a certain eccentricity between the central axis of the outer rotor 41 and the central axis of the inner rotor 42. When the inner rotor 42 rotates, at least some of the outer teeth of the inner rotor 42 mesh with at least some of the inner teeth of the outer rotor 41, thereby enabling the inner rotor 42 to drive the outer rotor 41 to rotate.

[0027] Please refer to Figure 10 , Figure 10In another embodiment of the electric pump, the electric pump can be applied to a liquid circulation system. The electric pump can drive the flow of the working medium within the circulation system. The working medium can be a 50% ethylene glycol aqueous solution or clean water. The electric pump includes a pump housing 1, which includes an impeller chamber cover 15 and a housing 16. The impeller chamber cover 15 is fixedly connected to the housing 16, for example, by means of screws or bolts. In this embodiment, the impeller chamber cover 15 is welded to the housing 16. The electric pump has a pump cavity, for example, the impeller chamber cover 15 is connected to the housing 16 to form the pump cavity; or the electric pump includes an end cover (not shown), the impeller chamber cover 15 is connected to the housing 16, and the housing 16 is connected to the end cover to form the pump cavity. The electric pump includes a pump shaft 7, a motor rotor assembly 6, an isolation sleeve 3, a stator assembly 5, and an electrical control assembly 8. The isolation sleeve 3 divides the pump cavity into a first cavity 20 and a second cavity 30. The first cavity 20 and the second cavity 30 are not connected. The working medium flows through the second cavity 30, while the first cavity 20 does not contain the working medium. When the electric pump is working, the working medium flows through the second chamber 30, while no working medium flows through the first chamber 20. The motor rotor assembly 6 and at least a portion of the pump shaft 7 are located in the second chamber 30, while at least a portion of the stator assembly 5 and at least a portion of the electrical control assembly 8 are located in the first chamber 20. In this embodiment, the stator assembly 5 and the electrical control assembly 8 are located in the first chamber 20. The stator assembly 5 and the electrical control assembly 8 do not contact the working medium, which helps avoid short circuits. The motor rotor assembly 6 is located on the outer periphery of the pump shaft 7. The stator assembly 5 is electrically connected to the electrical control assembly 8. The motor rotor assembly 6 includes an impeller assembly 61. When the electric pump is working, the electrical control assembly 8 controls the current in the stator assembly 5, thereby controlling the excitation magnetic field generated by the stator assembly 5. The motor rotor assembly 6 rotates under the action of the excitation magnetic field. Specifically, the motor rotor assembly 6 rotates around the pump shaft 7 or together with the pump shaft 7 under the action of the excitation magnetic field.

[0028] Please refer to Figures 1 to 14The electric pump includes a pin 2, and a stator assembly 5 includes an insulation portion 53 and a winding 52. The insulation portion 53 includes a connector 5321. The pin 2 includes a first electrical connection portion 21 and a second electrical connection portion 22. The winding 52 includes a first branch winding 521, which is located in a slot 5322 of the connector 5321. The first electrical connection portion 21 is located in the slot 5322 and is electrically connected to the first branch winding 521. The second electrical connection portion 22 is electrically connected to the electrical control assembly 8. In the radial direction of the electric pump, the first electrical connection portion 21 is farther away from the axis of the electric pump than the second electrical connection portion 22. The connector 5321 being relatively far away from the axis of the electric pump is beneficial for increasing the winding space of the winding 52 and for the electric pump to have a higher slot fill factor. In this embodiment, the first electrical connection part 21 has a fisheye hole, which is wider in the middle and narrower at both ends. This design not only increases the contractile elasticity of the first electrical connection part 21, but also allows different positions of the relatively arranged elastic part (not shown) to have different cross-sections, resulting in different contractile performance at different positions. This makes it more convenient and effortless to use. On the one hand, it ensures that the first electrical connection part 21 is easy to insert, and on the other hand, it ensures that the first electrical connection part 21 forms a good connection with the conductive socket (not shown) of the circuit board 81 after insertion and will not easily come out of the conductive socket. This makes the connection between it and the conductive socket of the circuit board 81 more secure and the signal transmission more reliable. The second electrical connection part 22 has a plug hole, and the first sub-winding 521 is located in the plug hole. The first sub-winding 521 contacts the wall of the plug hole, thereby electrically connecting the winding 52 to the pin 2.

[0029] The insulation portion 53 includes a yoke insulation portion 532 and a neck insulation portion 533. The stator assembly 5 has a winding slot 54 located between adjacent neck insulation portions 533. At least a portion of the winding 52 is located in the winding slot 54. The yoke insulation portion 532 includes a connector portion 5321. The slot wall of the winding slot 54 includes at least a portion of the inner wall of the yoke insulation portion 532. The inner wall of the yoke insulation portion 532 includes the inner wall 53211 of the connector portion 5321. The motor housing 11 includes a fixing portion 111 and a conductive portion 112. The conductive portion 112 extends from the fixing portion 111 toward the direction close to the electronic control assembly 8. The stator assembly 5 includes a stator core 51. The fixing portion 111 is fixedly connected to the stator core 51. The yoke insulation portion 532 and the conductive portion 112 are clearance-fitted. The inner diameter of the fixing portion 111 is smaller than the inner diameter of the conductive portion 112. When the torque demand of the electric pump needs to be increased, the power of the electric pump needs to be increased. Increasing the slot fill factor of the electric pump is one way to increase the power of the electric pump. The inner diameter of the conductive part 112 is relatively large, which allows the yoke insulation part 532 and the conductive part 112 to maintain a certain radial distance. This allows, for example, the connector part 5321 to be close to the conductive part 112, so that at least part of the inner diameter of the motor housing 11 can maintain its original size. On the one hand, this prevents an increase in the weight of the motor housing 11 due to the increase in slot fill factor; on the other hand, it helps to ensure installation with the customer. The aforementioned "radial distance" refers to the distance between the yoke insulation part 532 and the conductive part 112 in the radial direction of the electric pump.

[0030] The connector 5321 has an inner wall 53211 and an outer wall 53212. In the radial direction of the electric pump, the inner wall 53211 is closer to the axis of the electric pump than the outer wall 53212. The connector 5321 includes a groove 53213 that is recessed from the outer wall 53212 toward the inner wall 53211. The winding 52 includes a second sub-winding 522 located in the groove 53213. In the radial direction of the electric pump, the second sub-winding 522 is closer to the conductive part 112 than the first sub-winding 521. There is a gap between the conductive part 112 and the second sub-winding 522. When assembling the stator assembly 5, the coil of the second sub-winding 522 may crack under stress. If the second sub-winding 522, after the coil cracks, comes into contact with the conductive part 112, it will cause a short circuit in the electric pump. Setting a certain distance between the conductive part 112 and the second sub-winding 522 helps to avoid the above-mentioned short circuit. In one embodiment, the distance between the second sub-winding 522 and the conductive part 112 in the radial direction of the electric pump is greater than or equal to 0.5 mm. If the second sub-winding 522, after the coil cracks, is not likely to come into contact with the conductive part 112, the insulation requirements between the motor housing 11 and the second sub-winding 522 can be met, thus avoiding a short circuit in the electric pump.

[0031] In one embodiment, please refer to Figure 11 and Figure 12The winding slot 54 includes an inner wall 53211. The minimum distance from the slot wall of the connector 5322 to the axis of the electric pump is less than the maximum distance from the slot wall of the winding slot 54 to the axis of the electric pump; or, please refer to... Figure 13 At least part of the connector 5321 is located in the winding slot 54. The connector 5321 for mounting the pin 2 does not occupy the winding space of the stator assembly 5 winding 52, which is beneficial for the electric pump to have a better slot fill factor. Please refer to... Figure 11 and Figure 13 The yoke insulation portion 532 includes a positioning portion 5323, and the groove wall of the winding slot 54 includes the inner wall of the positioning portion 5323. The positioning portion 5323 has a positioning hole 53231. The electric pump includes an isolator 13, which includes a first positioning post 131. The first positioning post 131 is clearance-fitted with the wall of the positioning hole 53231, forming a minimum distance from the wall of the positioning hole 53231 to the axis of the electric pump that is less than the maximum distance from the groove wall of the winding slot 54 to the axis of the electric pump; or, please refer to Figure 12 The positioning part 5323 has a second positioning post 53232, and the electronic control assembly 8 includes a circuit board 81. The second positioning post 53232 is fixedly connected to the circuit board 81, and the inner sidewall of the second positioning post 53232 extends to the groove wall of the winding slot 54. The second positioning post 53232 can avoid occupying the winding space of the stator assembly winding 52, which is beneficial to the electric pump having a better slot fill factor.

[0032] Please refer to Figures 1 to 14The pin 2 includes a bent portion 23, which comprises a first portion 231, a second portion 232, and a third portion 233. The second portion 232 extends from the first portion 231 to the third portion 233. A first electrical connection portion 21 extends from the first portion 231 toward the stator assembly 5, and a second electrical connection portion 22 extends from the third portion 233 toward the electronic control assembly 8. The extension direction of the first electrical connection portion 21 and the extension direction of the second portion 232 form an angle and / or the extension direction of the second electrical connection portion 22 and the extension direction of the second portion 232 form an angle α. When the torque output requirement of the electric pump needs to be increased, the power of the electric pump needs to be increased. Increasing the slot fill factor of the electric pump is one way to increase the power of the electric pump. Based on increasing the slot fill factor of the electric pump, the position of the electronic control assembly 8 with the second electrical connection portion 22 does not need to be changed, which helps to reduce production costs. In addition, the electronic control assembly 8 can be reused in electric pumps of different power in the same series, which helps to reduce the production cost of the series products. In the radial direction of the electric pump, there is a gap between the first portion 231 and the third portion 233, and an angle β is formed between the extending direction of the first electrical connection portion 21 and the extending direction of the third portion 233. The first electrical connection portion 21 is farther away from the axis of the electric pump relative to the third portion 233. The relative distance between the first electrical connection portion 21 and the axis of the electric pump, and between the insertion portion 5321 and the axis of the electric pump, is beneficial to increasing the winding space of the winding 52 and to enabling the electric pump to have a higher slot fill factor. In one embodiment, in the axial direction of the electric pump, the height of the first portion 231 is not less than 2 mm, and the height of the third portion 233 is not less than 2 mm. This is beneficial to improving the bonding strength between the pin 2 and the isolator 13, thereby improving the fixing strength of the pin 2.

[0033] In one embodiment, please refer to Figure 6 and Figure 14 The electric pump has a first chamber 20, and the electrical control component 8 includes a circuit board 81 located in the first chamber 20. The bent portion 23 is located in the first chamber 20. In the axial direction of the electric pump, the minimum distance from the second portion 232 to the stator assembly 5 is greater than or equal to the minimum distance from the second portion 232 to the circuit board 81. When the circuit board 81 is inserted into the second electrical connection portion 22, the second electrical connection portion 22 will be subjected to the insertion force. The bent portion 23 is relatively close to the stator assembly 5. Since the first electrical connection portion 21 is inserted into the slot 5322 of the insertion portion 5321 first, the pin 2 can be straightened by the slot 5322, which helps to reduce the deformation of the pin 2.

[0034] In one embodiment, please refer to Figures 7 to 9 and Figure 14The electric pump has a first chamber 20 and a second chamber 30, which are not connected. A first electrical connection 21 is located in the first chamber 20, and a second electrical connection 22 is located in the second chamber 30. An isolator 13 is fixedly connected to the circuit board 81. The isolator 13 is an injection molded part, and a bent part 23 is embedded in the isolator 13. The pin 2 can have a large contact area with the isolator 13, which is beneficial to improving the fixing strength of the pin 2.

[0035] In one embodiment, please refer to Figure 4 and Figure 5 The electric pump has a first chamber 20, a first electrical connection 21 located in the first chamber 20, and a second electrical connection 22 located in the first chamber 20. The electric pump includes a cage 9 and a pump shaft 7. The cage 9 includes a main body 91 and an injection-molded part 92, which are fixedly connected. The main body 91 is directly or indirectly supported by the pump shaft 7. The bent part 23 is embedded in the injection-molded part 92. The pin 2 and the cage 9 are integrated, which helps to simplify the structure of the electric pump. In addition, the pin 2 can have a large contact area with the injection-molded part 92, which helps to improve the fixing strength of the pin 2. When the pin 2 is inserted into the stator assembly 5 and the electrical control assembly 8 respectively, it helps to reduce the deformation of the pin 2.

[0036] 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 pin (2), a stator assembly (5), and an electrical control assembly (8). The stator assembly (5) includes an insulation portion (53) and a winding (52). The insulation portion (53) includes a connector (5321). The pin (2) includes a first electrical connection portion (21) and a second electrical connection portion (22). The winding (52) includes a first sub-winding (521). The first sub-winding (521) is located in a slot (5322) of the connector (5321). At least a portion of the first electrical connection portion (21) is located in the slot (5322). The first electrical connection portion (21) is electrically connected to the first sub-winding (521). The second electrical connection portion (22) is electrically connected to the electrical control assembly (8). In the radial direction of the electric pump, the first electrical connection portion (21) is away from the axis of the electric pump relative to the second electrical connection portion (22).

2. The electric pump according to claim 1, characterized in that, The pin (2) includes a bent portion (23), which includes a first portion (231), a second portion (232) and a third portion (233). The second portion (232) extends from the first portion (231) to the third portion (233). The first portion (231) extends from the first electrical connection portion (21) in a direction away from the stator assembly (5). The third portion (233) extends from the second electrical connection portion (22) in a direction away from the electronic control assembly (8). The extension direction of the second electrical connection portion (22) and the extension direction of the second portion (232) have an angle (α).

3. The electric pump according to claim 2, characterized in that, In the radial direction of the electric pump, there is a gap (L) between the first portion (231) and the third portion (233), and there is an angle (β) between the extending direction of the first electrical connection (21) and the extending direction of the second portion (232), and the first electrical connection (21) is away from the axis of the electric pump relative to the third portion (233).

4. The electric pump according to claim 2, characterized in that, In the axial direction of the electric pump, the height of the first portion (231) is not less than 2 mm, and the height of the third portion (233) is not less than 2 mm.

5. The electric pump according to claim 3, characterized in that, In the axial direction of the electric pump, the height of the first portion (231) is not less than 2 mm, and the height of the third portion (233) is not less than 2 mm.

6. The electric pump according to any one of claims 2-5, characterized in that, The electrical control assembly (8) includes a circuit board (81), the electric pump has a first chamber (20), the circuit board (81) is located in the first chamber (20), the bent portion (23) is located in the first chamber (20), and in the axial direction of the electric pump, the minimum distance (D1) from the second portion (232) to the stator assembly (5) is greater than or equal to the minimum distance (D2) from the second portion (232) to the circuit board (81).

7. The electric pump according to any one of claims 2-5, characterized in that, The electric pump has a first chamber (20) and a second chamber (30), which are not connected. The first electrical connection part (21) is located in the first chamber (20), and the second electrical connection part (22) is located in the second chamber (30). The electric pump includes an isolator (13), and the electrical control assembly (8) includes a circuit board (81). The isolator (13) is fixedly connected to the circuit board (81). The isolator (13) is an injection molded part, and the bending part (23) is embedded in the isolator (13).

8. The electric pump according to any one of claims 2-5, characterized in that, The electric pump has a first chamber (20), a first electrical connection (21) located in the first chamber (20), a second electrical connection (22) located in the first chamber (20), and the electric pump includes a retainer (9) and a pump shaft (7); the retainer (9) is directly or indirectly supported by the pump shaft (7), the retainer is an injection molded part, and the bent part (23) is embedded in the retainer (9). Alternatively, the retainer (9) includes a main body (91) and an injection molding part (92), the main body (91) and the injection molding part (92) are fixedly connected, the main body (91) is directly or indirectly supported by the pump shaft (7), and the bent part (23) is embedded in the injection molding part (92).

9. The electric pump according to claim 1, characterized in that, The electric pump includes a motor housing (11), which includes a fixing part (111) and a conductive part (112). The conductive part (112) extends from the fixing part (111) toward the electrical control assembly (8). The stator assembly (5) includes a stator core (51). The fixing part (111) is fixedly connected to the stator core (51). The insulating part (53) is clearance-fitted with the conductive part (112). The inner diameter of the fixing part (111) is smaller than the inner diameter of the conductive part (112).

10. The electric pump according to any one of claims 1-5, characterized in that, The electric pump includes a motor rotor assembly (6) located radially inside the stator assembly (5). The electric pump includes a first chamber (20) and a third chamber (40) which are not connected. The stator assembly (5) is located in the first chamber (20) and the motor rotor assembly (6) is located in the third chamber (40).

11. The electric pump according to claim 6, characterized in that, The electric pump includes a motor rotor assembly (6) located radially inside the stator assembly (5). The electric pump includes a first chamber (20) and a third chamber (40) which are not connected. The stator assembly (5) is located in the first chamber (20) and the motor rotor assembly (6) is located in the third chamber (40).

12. The electric pump according to claim 7, characterized in that, The electric pump includes a motor rotor assembly (6) located radially inside the stator assembly (5). The electric pump includes a first chamber (20) and a third chamber (40) which are not connected. The stator assembly (5) is located in the first chamber (20) and the motor rotor assembly (6) is located in the third chamber (40).

13. The electric pump according to claim 8, characterized in that, The electric pump includes a motor rotor assembly (6) located radially inside the stator assembly (5). The electric pump includes a first chamber (20) and a third chamber (40) which are not connected. The stator assembly (5) is located in the first chamber (20) and the motor rotor assembly (6) is located in the third chamber (40).

14. The electric pump according to claim 9, characterized in that, The electric pump includes a motor rotor assembly (6) located radially inside the stator assembly (5). The electric pump includes a first chamber (20) and a third chamber (40) which are not connected. The stator assembly (5) is located in the first chamber (20) and the motor rotor assembly (6) is located in the third chamber (40).

15. The electric pump according to any one of claims 1-5, characterized in that, The electric pump includes a motor rotor assembly (6) and a pump rotor (4), the pump rotor (4) being drivenly connected to the motor rotor assembly (6), the motor rotor assembly (6) being located radially inside the stator assembly (5), the electric pump including a first chamber (20) and a third chamber (40), the first chamber (20) and the third chamber (40) being connected, the motor rotor assembly (6) being located in the first chamber (20), the stator assembly (5) being located in the first chamber (20), and the pump rotor (4) being located in the third chamber (40).

16. The electric pump according to claim 6, characterized in that, The electric pump includes a motor rotor assembly (6) and a pump rotor (4), the pump rotor (4) being drivenly connected to the motor rotor assembly (6), the motor rotor assembly (6) being located radially inside the stator assembly (5), the electric pump including a first chamber (20) and a third chamber (40), the first chamber (20) and the third chamber (40) being connected, the motor rotor assembly (6) being located in the first chamber (20), the stator assembly (5) being located in the first chamber (20), and the pump rotor (4) being located in the third chamber (40).

17. The electric pump according to claim 7, characterized in that, The electric pump includes a motor rotor assembly (6) and a pump rotor (4), the pump rotor (4) being drivenly connected to the motor rotor assembly (6), the motor rotor assembly (6) being located radially inside the stator assembly (5), the electric pump including a first chamber (20) and a third chamber (40), the first chamber (20) and the third chamber (40) being connected, the motor rotor assembly (6) being located in the first chamber (20), the stator assembly (5) being located in the first chamber (20), and the pump rotor (4) being located in the third chamber (40).

18. The electric pump according to claim 8, characterized in that, The electric pump includes a motor rotor assembly (6) and a pump rotor (4), the pump rotor (4) being drivenly connected to the motor rotor assembly (6), the motor rotor assembly (6) being located radially inside the stator assembly (5), the electric pump including a first chamber (20) and a third chamber (40), the first chamber (20) and the third chamber (40) being connected, the motor rotor assembly (6) being located in the first chamber (20), the stator assembly (5) being located in the first chamber (20), and the pump rotor (4) being located in the third chamber (40).

19. The electric pump according to claim 9, characterized in that, The electric pump includes a motor rotor assembly (6) and a pump rotor (4), the pump rotor (4) being drivenly connected to the motor rotor assembly (6), the motor rotor assembly (6) being located radially inside the stator assembly (5), the electric pump including a first chamber (20) and a third chamber (40), the first chamber (20) and the third chamber (40) being connected, the motor rotor assembly (6) being located in the first chamber (20), the stator assembly (5) being located in the first chamber (20), and the pump rotor (4) being located in the third chamber (40).

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