Electric pump

Abstract

The utility model relates to an electric pump, the electric pump comprises a circuit board, a contact pin and an electric connection assembly, the electric connection assembly comprises an electric connection part and a retaining sleeve, the electric connection part is fixedly connected with the retaining sleeve, the electric connection part is fixedly and electrically connected with the circuit board, the electric connection part comprises a conductive part, and the conductive part is electrically connected with the retaining sleeve. The retaining sleeve is provided with a containing part, at least part of the conductive part is located in the containing part, the conductive part is in contact with the contact pin and is electrically connected with the contact pin, the retaining sleeve comprises an elastic part, and the conductive part abuts against the elastic part. The utility model has the characteristic of improving the reliability of the electric connection between the contact pin and the electric connection part.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicles, in particular to an electric pump. BACKGROUND

[0002] The electric pump mainly provides a power source for the lubrication system and / or cooling system of a vehicle. The electric pump comprises a connector, an electric connection part and a circuit board. The electric connection part is fixedly connected with the circuit board by welding. The electric connection part comprises a socket and an elastic conductive part. One end of the pin is electrically connected with an external power source. The other end of the pin is inserted into the socket and is in contact with the elastic conductive part. If stress relaxation occurs in the electric connection part after long-term use, the contact pressure between the pin and the elastic conductive part decreases, thereby reducing the electrical connection reliability of the pin and the electric connection part. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the present application is to obtain an electric pump, which is beneficial to improve the electrical connection reliability of the pin and the electric connection part.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] An electric pump comprises a circuit board, a pin and an electric connection assembly. The electric connection assembly comprises an electric connection part and a retaining sleeve. The electric connection part and the retaining sleeve are fixedly connected or positionally connected. The electric connection part is fixedly connected and electrically connected with the circuit board. The electric connection part comprises a conductive part. The retaining sleeve has a receiving part. At least part of the conductive part is located in the receiving part. The conductive part is in contact with the pin. The conductive part is electrically connected with the pin. The retaining sleeve comprises an elastic part. The conductive part abuts against the elastic part. The yield strength of the conductive part is less than the yield strength of the elastic part.

[0006] In the above-mentioned technical solution, the electric connection part comprises a conductive part. The conductive part is in contact with the pin. The retaining sleeve comprises an elastic part. The conductive part abuts against the elastic part. The yield strength of the conductive part is less than the yield strength of the elastic part. The yield strength of the elastic part is relatively large. When the conductive part is in stress relaxation, the elastic part can maintain the contact pressure between the pin and the conductive part, thereby maintaining the contact resistance between the pin and the conductive part. The heat generation of the conductive part can be relatively small. Therefore, the stress relaxation speed of the conductive part is reduced, thereby being beneficial to improve the electrical connection reliability of the pin and the electric connection part. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 It is a cross-sectional schematic view of an embodiment of the electric pump of the present application.

[0008] Figure 2 It is a cross-sectional schematic view of another embodiment of the electric pump.

[0009] Figure 3 It is Figure 2Connection of the midsole cover, the circuit board, the electrical connection assembly and the spacer

[0010] Figure 4 For Figure 3 Schematic view of the section A-A

[0011] Figure 5 For Figure 4 Enlarged schematic view of the section B

[0012] Figure 6 Schematic view of the connection of the circuit board and the electrical connection assembly

[0013] Figure 7 Schematic view of the first perspective of the electrical connection assembly

[0014] Figure 8 Is Figure 7 Schematic view of the section C-C

[0015] Figure 9 Schematic view of the second perspective of the electrical connection assembly

[0016] Figure 10 Is Figure 9 Schematic view of the section E-E

[0017] Figure 11 Is Figure 7 Schematic view of the structure of the retaining sleeve

[0018] Figure 12 Is Figure 11 Enlarged schematic view of the section D

[0019] Figure 13 Is Figure 7 Schematic view of the structure of the electrical connection part

[0020] Figure 14 Is Figure 11 Schematic view of an embodiment of the manufacturing process of the retaining sleeve.

[0021] Label: 1, pump housing; 11, motor housing; 12, bottom cover; 13, spacer; 14, pump cover; 141, inlet channel; 2, pin; 3, electrical connection assembly; 31, electrical connection part; 311, conductive part; 3111, first subpart; 3112, second subpart; 3113, third subpart; 312, socket; 314, base; 3141, fourth fixed part; 315, connecting part; 32, retaining sleeve; 320, preform plate; 321, accommodating part; 322, elastic part; 3221, inner side wall surface; 323, second through hole; 324, body part; 325, first fixed part; 3251, first welding part; 3252, first end surface; 326, second fixed part; 3261, second welding part; 3262, second end surface; 328, welding part; 329, third fixed part; 4, pump rotor; 41, first rotor; 42, second rotor; 5, stator assembly; 51, stator core; 6, motor rotor; 7, drive shaft; 8, control assembly; 81, circuit board; 811, first surface; 812, second surface; 20, first cavity; 30, second cavity; 40, third cavity. DETAILED DESCRIPTION

[0022] In order to make the technical personnel in the art better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other technical solutions can also be obtained without creative labor on the basis of these technical solutions. The up and down orientation words involved in this paper are defined by the positions of the parts shown in the drawings relative to each other, and are only for the purpose of expressing the technical solutions clearly and conveniently. It should be understood that the orientation words used in this paper should not limit the scope of the application claimed.

[0023] The electric pump can be applied to the automobile lubrication system and / or cooling system, and can provide circulating power for the flow of the working medium in the automobile lubrication system and / or cooling system. The automobile lubrication system and / or cooling system can provide lubricating oil and / or cooling oil for the transmission system. In the present application, "A and B fixed connection" means that there is no relative displacement between A and B after connection, for example, A and B are welded and fixed; "A and B limit connection" means that A limits the movement of B in a certain direction, or B limits the movement of A in a certain direction.

[0024] Please refer to Figure 1 , Figure 1is a schematic view of an embodiment of an electric pump; the electric pump comprises a pump housing 1, the pump housing 1 comprises a pump cover 14, a motor housing 11 and a bottom cover 12, the pump cover 14 is fixedly connected with the motor housing 11, for example, the pump cover 14 is connected with the motor housing 11 through screws or bolts, of course, the pump cover 14 and the motor housing 11 can also be connected through other connection modes, for example, using plug-in, clamping and the like; the motor housing 11 is fixedly connected with the bottom cover 12, for example, the motor housing 11 is connected with the bottom cover 12 through screws or bolts, which is conducive to making the disassembly of the electric pump more convenient. The electric pump comprises a pump rotor 4, a stator assembly 5, a motor rotor 6, a drive shaft 7 and a control assembly 8, the stator assembly 5 is located on the radial outer side of the motor rotor 6, the drive shaft 7 is in transmission connection with the motor rotor 6, the electric pump has an inflow passage 141, a first cavity 20 and a second cavity 30, the inflow passage 141 is in communication with the first cavity 20, the first cavity 20 is in communication with the second cavity 30, the pump rotor 4 (or at least part of the pump rotor 4) is located in the first cavity 20, at least part of the control assembly 8, the motor rotor 6 (or at least part of the motor rotor 6), at least part of the drive shaft 7 and the stator assembly 5 (or at least part of the stator assembly 5) are located in the second cavity 30, the control assembly 8 and the stator assembly 5 are located in the same cavity, which can reduce the size of the electric pump in the axial direction, and the structure is compact, thereby reducing the production cost of the electric pump. The electric pump comprises a pin 2, the control assembly 8 comprises a circuit board 81, the pin 2 is electrically connected with the circuit board 81, the pin 2 can be electrically connected with an external power supply, the circuit board 81 and at least part of the pin 2 are located in the second cavity 30, the circuit board 81 and at least part of the pin 2 are in contact with the working medium in the second cavity 30. In this way, the working medium in the second cavity 30 can exchange heat with the heat generated by the circuit board 81 and the pin 2, thereby facilitating heat dissipation of the circuit board 81 and the pin 2, and further facilitating improvement of the service life of the electric pump; in addition, such a setting can meet the needs of electric pumps of different powers, especially high-power electric pumps, without the need to set up additional heat dissipation structures for heat dissipation of the circuit board 81 and the pin 2, while simplifying the structure of the electric pump, it is conducive to reducing the production cost of the electric pump.

[0025] Please refer to Figure 2 , Figure 2It is another embodiment of the schematic diagram of the electric pump, the electric pump comprises a pump housing 1, the pump housing 1 comprises a pump cover 14, a motor housing 11, a bottom cover 12 and a spacer 13, the pump cover 14 is fixedly connected with the motor housing 11, the motor housing 11 is fixedly connected with the spacer 13, the bottom cover 12 is fixedly connected with the spacer 13, for example, the motor housing 11, the bottom cover 12 and the spacer 13 are connected by screws, which is conducive to the disassembly and assembly of the electric pump. The electric pump comprises a pump rotor 4, a stator assembly 5, a motor rotor 6, a drive shaft 7 and a control assembly 8, the stator assembly 5 is electrically connected with the control assembly 8, the stator assembly 5 is located on the radial outer side of the motor rotor 6, the drive shaft 7 is in transmission connection with the motor rotor 6, the electric pump has a first cavity 20, a second cavity 30 and a third cavity 40, the first cavity 20 is in communication with the second cavity 30, the second cavity 30 and the third cavity 40 are not communicated, the pump rotor 4 (or at least part of the pump rotor 4) is located in the first cavity 20, the motor rotor 6 (or at least part of the motor rotor 6), at least part of the drive shaft 7 and the stator assembly 5 (or at least part of the stator assembly 5) are located in the second cavity 30, the electric pump comprises a pin 2, the control assembly 8 comprises a circuit board 81, the pin 2 is electrically connected with the circuit board 81, the pin 2 can be electrically connected with an external power supply, the circuit board 81 and at least part of the pin 2 are located in the third cavity 40, when the electric pump works, the first cavity 20 can have working medium, at least part of the working medium in the first cavity 20 flows into the second cavity 30, the control assembly 8 is located in the third cavity 40, which is conducive to the circuit board 81 and the pin 2 not being affected by the working medium.

[0026] Please refer to Figure 1 and Figure 2 , the stator assembly 5 comprises a stator core 51 and a winding (not shown in the figure), the pump rotor 4 is in rotational connection with the motor rotor 6, when the electric pump works, the control assembly 8 controls the current in the winding of the stator assembly 5 to change according to a predetermined rule, 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 the embodiment, the drive shaft 7 is in transmission connection with the pump rotor 4 and the motor rotor 6, specifically, one side of the drive shaft 7 is connected with the second rotor 42, the other side of the drive shaft 7 is connected with the motor rotor 6, the motor rotor 6 drives the second rotor 42 to rotate through the drive shaft 7, thereby realizing the rotation of the pump rotor 4. Please refer to Figure 2The first rotor 41 is located at the outer periphery of the second rotor 42, and the first rotor 41 is internally meshed with the second rotor 42. In other embodiments, the first rotor 41 can also be externally meshed with the second rotor 42, and the first rotor 41 and the second rotor 42 are arranged side by side. In this embodiment, the central axis of the first rotor 41 is offset from the central axis of the second rotor 42, that is, the central axis of the first rotor 41 has a certain eccentricity from the central axis of the second rotor 42. When the second rotor 42 rotates, at least part of the external teeth of the second rotor 42 meshes with at least part of the internal teeth of the first rotor 41, so that the second rotor 42 can drive the first rotor 41 to rotate.

[0027] Please refer to Figures 1 to 14 The electric pump comprises an electric connection assembly 3, the electric connection assembly 3 comprises an electric connection part 31 and a retaining sleeve 32, the electric connection part 31 and the retaining sleeve 32 are fixedly connected or positionally connected, the electric connection part 31 and the circuit board 81 are fixedly connected and electrically connected, the retaining sleeve 32 has a receiving part 321, at least part of the electric connection part 31 is located in the receiving part 321, the electric connection part 31 comprises a conductive part 311, at least part of the conductive part 311 is located in the receiving part 321, the conductive part 311 contacts the pin 2, the conductive part 311 is electrically connected with the pin 2, the retaining sleeve 32 comprises an elastic part 322, the conductive part 311 abuts against the elastic part 322, the yield strength of the conductive part 311 is less than the yield strength of the elastic part 322, the yield strength of the elastic part 322 is relatively large, when the conductive part 311 is stress-relaxed, the elastic part 322 can maintain the contact pressure between the pin 2 and the conductive part 311, and further can maintain the contact resistance between the pin 2 and the conductive part 311, the heat generation of the conductive part 311 can be relatively small, so that the stress-relaxation speed of the conductive part 311 is reduced, thereby being beneficial to improving the electrical connection reliability of the pin 2 and the electric connection part 31.

[0028] Please refer to Figures 3 to 14The electric connection part comprises at least two conductive parts 311, one of the conductive parts 311 is located at one end of the pin 2, and the other of the conductive parts 311 is located at the other end of the pin 2, the conductive parts 311 comprise a first part 3111 and a second part 3112, the second part 3112 extends obliquely from the first part 3111 in a direction away from the pin 2, the first part 3111 contacts the pin 2, and the second part 3112 abuts against the elastic part 322. When the pin 2 passes through the insertion hole 312 to contact the conductive part 311, the conductive part 311 is pressed in a direction away from the central axis of the insertion hole 312, and since the conductive part 311 can be elastically deformed, the resistance of the pin 2 when inserted into the insertion hole 312 can be reduced, thereby facilitating the operation force when the pin 2 is inserted into the circuit board 81. Under the action of the restoring force of the conductive part 311, the conductive part 311 can maintain good contact with the pin 2, the elastic plug-in cooperation between the pin 2 and the electric connection part 31 is realized, and the connection reliability between the pin 2 and the electric connection part 31 can be improved. The conductive part 311 comprises a third part 3113, the third part 3113 extends obliquely from the first part 3111 in a direction away from the pin 2, and in the axial direction of the electric pump, the height H2 of the third part 3113 is greater than the height H1 of the second part 3112. Under the condition that the lengths of the pins 2 are equivalent, if the first part 3111 in contact with the pin 2 is far away from the circuit board 81, the pin 2 and the conductive part 311 can be in poor contact, and in the embodiment, the first part 3111 in contact with the pin 2 can be relatively close to the circuit board 81, thereby improving the electric connection reliability between the pin 2 and the conductive part 311.

[0029] Please refer to Figures 3 to 14The electric connecting part 31 comprises at least one connecting part 315 and a base part 314, the base part 314 is connected with the connecting part 315, the connecting part 315 is fixedly connected with the circuit board 81, the mechanical connection and the electric connection between the electric connecting part 31 and the circuit board 81 are realized, for example, the connecting part 315 is fixedly connected with the circuit board 81 by welding, at least part of the base part 314 protrudes from the circuit board 81, the base part 314 is connected with one end of the conductive part 311, specifically, the base part 314 is connected with the third part 3113, and the base part 314 can support the conductive part 311. The base part 314 has a socket 312, at least part of the socket 312 is communicated with the accommodating part 321, at least part of the contact pin 2 is located in the socket 312 and the contact pin 2 is in clearance fit with the base part 314, the contact pin 2 passes through the socket 312 to contact the conductive part 311, compared with the contact pin 2 fixedly connected with the circuit board 81 by welding, the assembly process is simple, the cleanliness is good, and the contact pin 2 can be plugged in and out repeatedly. The circuit board 81 has a first surface 811 and a second surface 812, in the axial direction of the electric pump, the connecting part 315 is close to the first surface 811 relative to the second surface 812, one end of the base part 314 is connected with the connecting part 315, the other end of the base part 314 penetrates through the circuit board 81 and extends away from the second surface 812, the base part 314 penetrates through the circuit board 81, because the circuit board 81 has a certain thickness, it is equivalent to that a reinforcing structure is formed on the outer periphery of the base part 314, which is beneficial to support and fix the base part 314.

[0030] The retaining sleeve 32 comprises a body part 324, the body part 324 is connected with one end of the elastic part 322, the body part 324 has a spacing with the other end of the elastic part 322, in the axial direction of the electric pump, the length L3 of the body part 324 is less than or equal to the length L4 of the base part 314, on the one hand, the elastic part 322 has a certain length, on the other hand, the material of the retaining sleeve is saved; the length L1 of the elastic part 322 is less than the length L2 of the conductive part 311, the length of the elastic part 322 is relatively long, on the one hand, the clamping force on the conductive part 311 can be maintained; on the other hand, because the contact pin 2 is inserted into the conductive part 311, the conductive part 311 contacts the elastic part 322, the contact pin 2 has an acting force on the elastic part 322, if the deformation value of the elastic part 322 caused by the acting force is a fixed value a, the length of the elastic part 322 is L1, and the deformation angle of the elastic part 322 is α, tan α = a / L, the length of the elastic part 322 is relatively long, and the deformation angle of the elastic part 322 is relatively small.

[0031] Please refer to Figures 3 to 14The body part 324 includes a first fixed part 325 and a second fixed part 326, and the first fixed part 325 has a spacing between the connecting part 315 in the axial direction of the electric pump, and the second fixed part 326 has a spacing between the connecting part 315, the first fixed part 325 has a first end face 3252, and the second fixed part 326 has a second end face 3262, the retaining sleeve 32 includes a welding part 328, and at least part of the welding part 328 is located between the first end face 3252 and the second end face 3262. A part of the first fixed part 325 and a part of the second fixed part 326 are fused to form the welding part 328, and the fixing mode of the first fixed part 325 and the second fixed part 326 is simple; for example, a preformed plate 320 is punched on a plate, then the first fixed part 325 and the second fixed part 326 of the preformed plate 320 are bent to be close, then the first fixed part 325 and the second fixed part 326 are fixedly connected to form the retaining sleeve 32, and the first fixed part 325 and the second fixed part 326 have a certain distance before being fixedly connected, which is beneficial to reduce the material of the retaining sleeve 32. The welding mode of the first fixed part 325 and the second fixed part 326 includes but is not limited to laser welding, ultrasonic welding, rotary friction welding or hot melting welding, and the welding mode can be selected according to the material of the retaining sleeve 32. The first end face 3252 is parallel to the plane α in which the inner side wall face 3221 is located, and the second end face 3262 is parallel to the plane α in which the inner side wall face 3221 is located, the welding part 328 includes a first welding part 3251 of the first fixed part 325 and a second welding part 3261 of the second fixed part 326, the first welding part 3251 and the second welding part 3261 are fixedly welded, the spacing D1 between the first end face 3252 and the second end face 3262 is in the direction parallel to the plane α in which the inner side wall face 3221 is located, the thickness of the first fixed part 325 or the second fixed part 326 is D2, and D1 is 1.5 times to 2.5 times of D2. If D1 is small, the welding seam will be narrow, the heat input will be too high, the welding speed will be too fast, and various defects will be easily generated in the welding seam, including welding bumps, slag inclusions, pits, cracks and the like; and if D2 is too large, the welding time will be increased. The retaining sleeve 32 has a second through hole 323, the second through hole 323 is in communication with the accommodating part 321, the accommodating part 321 is an accommodating groove or a first through hole, Figures 3 to 14The shown accommodating part is a first through hole, a hole wall defining a second through hole 323 comprises an outer side wall of the elastic part 322, the elastic part 322 can be directly formed on a plate material, for example, 304 stainless steel, the processing technology is simple, the conductive part 311 contacts an inner side wall surface 3221 of the elastic part 322, the first fixing part 325 is perpendicular to a plane α where the inner side wall surface 3221 is located, the second fixing part 326 is perpendicular to the plane α where the inner side wall surface 3221 is located, and the first fixing part 325 and the second fixing part 326 are fixedly connected. The plane where the first fixing part 325 is located and the plane where the second fixing part 326 is located are not in the same plane as the plane where at least part of the elastic part 322 is located, the retaining sleeve 32 can be provided with a plurality of elastic parts 322, thereby increasing the contact of the conductive part 311 with the pin 2, and thereby increasing the current carrying capacity of the pin 2; if a preformed plate 320 is punched from a plate material, the first fixing part 325 and the second fixing part 326 are brought close by bending the preformed plate 320, the first fixing part 325 and the second fixing part 326 are fixedly connected, and the elastic part 322 has a good clamping force on the conductive part 311.

[0032] Please refer to Figures 9 to 13 The retaining sleeve 32 comprises at least two third fixing parts 329, the plane where the elastic part 322 is located has an included angle with at least part of the plane where the third fixing part 329 is located; the base 314 has a fourth fixing part 3141, the third fixing part 329 and the fourth fixing part 3141 are correspondingly clamped and fixed; or, the third fixing part 329 and the fourth fixing part 3141 are fixedly welded; or, the third fixing part 329 and the fourth fixing part 3141 are dovetail groove connected. The fourth fixing part 3141 is a through hole or a groove, the third fixing part 329 and the fourth fixing part 3141 are correspondingly clamped and fixed, when the retaining sleeve 32 is assembled with the electrical connection part 31, the retaining sleeve 32 is first sleeved on the outer periphery of the electrical connection part 31, the third fixing part 329 of the retaining sleeve 32 is correspondingly clamped and fixed with the fourth fixing part 3141 during the movement of the retaining sleeve 32, the connection mode is simple, in addition, the third fixing part 329 is bent towards the electrical connection part 31, which is beneficial to make the volume of the electrical connection assembly 3 smaller.

[0033] The technical features of the above-described embodiments can be combined in any manner, and to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0034] The above-described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications can be made, which are all within the protection scope of the present application.

Claims

1. An electric pump characterized by comprising: The electric pump comprises a circuit board (81), a pin (2) and an electric connection assembly (3), the electric connection assembly (3) comprises an electric connection part (31) and a retaining sleeve (32), the electric connection part (31) and the retaining sleeve (32) are fixedly connected or positionally connected, the electric connection part (31) is fixedly connected and electrically connected with the circuit board (81), the electric connection part (31) comprises a conductive part (311), the retaining sleeve (32) has a receiving part (321), at least part of the conductive part (311) is located in the receiving part (321), the conductive part (311) contacts the pin (2), the conductive part (311) is electrically connected with the pin (2), the retaining sleeve (32) comprises an elastic part (322), the conductive part (311) abuts against the elastic part (322), the yield strength of the conductive part (311) is less than the yield strength of the elastic part (322).

2. The electric pump according to claim 1, characterized in that, The electric connection part (31) comprises at least two conductive parts (311), one of the conductive parts (311) is located at one end of the pin (2), the other of the conductive parts (311) is located at the other end of the pin (2), the conductive part (311) comprises a first subpart (3111) and a second subpart (3112), the second subpart (3112) extends obliquely away from the first subpart (3111) in a direction away from the pin (2), the first subpart (3111) contacts the pin (2), and the second subpart (3112) abuts against the elastic part (322).

3. The electric pump according to claim 2, characterized in that, The conductive part (311) comprises a third subpart (3113), the third subpart (3113) extends obliquely away from the first subpart (3111) in a direction away from the pin (2), in the axial direction of the electric pump, the height (H2) of the third subpart (3113) is greater than the height (H1) of the second subpart (3112).

4. The electric pump according to any one of claims 1 to 3, characterized in that The electric connection part (31) comprises at least one connecting part (315) and a base part (314), the base part (314) is connected with the connecting part (315), the connecting part (315) is fixedly connected with the circuit board (81), at least part of the base part (314) protrudes from the circuit board (81), and one end of the base part (314) is connected with the conductive part (311).

5. The electric pump according to claim 4, characterized in that, The base part (314) has a socket (312), at least part of the socket (312) communicates with the receiving part (321), and at least part of the pin (2) is located in the socket (312) and gap-fitted with the base part (314).

6. The electric pump according to claim 4, characterized in that, The circuit board (81) has a first face (811) and a second face (812), in the axial direction of the electric pump, the connecting part (315) is closer to the first face (811) relative to the second face (812), one end of the base part (314) is connected with the connecting part (315), and the other end of the base part (314) penetrates through the circuit board (81) and extends away from the second face (812).

7. The electric pump according to claim 5, characterized in that, The circuit board (81) has a first surface (811) and a second surface (812), in the axial direction of the electric pump, the connecting portion (315) is close to the first surface (811) relative to the second surface (812), one end of the base portion (314) is connected with the connecting portion (315), and the other end of the base portion (314) penetrates through the circuit board (81) and extends away from the second surface (812).

8. The electric pump according to any one of claims 5-7, characterized in that, The retaining sleeve (32) includes a body portion (324) connected with one end of the elastic portion (322), and the body portion (324) has a spacing from the other end of the elastic portion (322), in the axial direction of the electric pump, the length (L3) of the body portion (324) is less than or equal to the length (L4) of the base portion (314), and the length (L1) of the elastic portion (322) is less than the length (L2) of the conductive portion (311).

9. The electric pump according to claim 8, characterized in that, The body portion (324) includes a first fixed portion (325) and a second fixed portion (326), in the axial direction of the electric pump, the first fixed portion (325) has a spacing from the connecting portion (315), and the second fixed portion (326) has a spacing from the connecting portion (315), the first fixed portion (325) has a first end surface (3252), the second fixed portion (326) has a second end surface (3262), and the retaining sleeve (32) includes a welding portion (328), at least part of the welding portion (328) is located between the first end surface (3252) and the second end surface (3262).

10. The electric pump of claim 4, wherein, The retaining sleeve (32) includes at least two third fixed portions (329), a plane in which the elastic portion (322) is located has an included angle with a plane in which at least part of the third fixed portions (329) are located; the base portion (314) has a fourth fixed portion (3141), the third fixed portions (329) are snap-fitted with the corresponding walls of the fourth fixed portion (3141); or the third fixed portions (329) are welded with the fourth fixed portion (3141).

11. The electric pump of claim 8, wherein, The retaining sleeve (32) includes at least two third fixed portions (329), a plane in which the elastic portion (322) is located has an included angle with a plane in which at least part of the third fixed portions (329) are located; the base portion (314) has a fourth fixed portion (3141), the third fixed portions (329) are snap-fitted with the corresponding walls of the fourth fixed portion (3141); or the third fixed portions (329) are welded with the fourth fixed portion (3141).

12. The electric pump according to any one of claims 5 to 7, 9, characterized in that The retaining sleeve (32) comprises at least two third fixing portions (329), a plane where the elastic portion (322) is located and a plane where at least part of the third fixing portions (329) are located have an included angle; the base portion (314) has a fourth fixing portion (3141), the third fixing portions (329) and the fourth fixing portions (3141) correspondingly clasp and fix the wall, or the third fixing portions (329) and the fourth fixing portions (3141) are fixed by welding.

13. The electric pump according to any one of claims 1 to 3, 5 to 7, 9 to 11, characterized by, The electric pump has an inflow channel (141), a first cavity (20) and a second cavity (30), the inflow channel (141) and the first cavity (20) are communicated, the first cavity (20) and the second cavity (30) are communicated, the electric pump comprises a pump rotor (4) and a motor rotor (6), the pump rotor (4) is located in the first cavity (20), at least part of the motor rotor (6) is located in the second cavity (30), the pump rotor (4) and the motor rotor (6) are rotationally connected; the circuit board (81) and at least part of the pins (2) are located in the second cavity (30); or the electric pump has a third cavity (40), the third cavity (40) is not communicated with the second cavity (30), the circuit board (81) and at least part of the pins (2) are located in the third cavity (40).

14. The electric pump of claim 4, wherein, The electric pump has an inflow channel (141), a first cavity (20) and a second cavity (30), the inflow channel (141) and the first cavity (20) are communicated, the first cavity (20) and the second cavity (30) are communicated, the electric pump comprises a pump rotor (4) and a motor rotor (6), the pump rotor (4) is located in the first cavity (20), at least part of the motor rotor (6) is located in the second cavity (30), the pump rotor (4) and the motor rotor (6) are rotationally connected; the circuit board (81) and at least part of the pins (2) are located in the second cavity (30); or the electric pump has a third cavity (40), the third cavity (40) is not communicated with the second cavity (30), the circuit board (81) and at least part of the pins (2) are located in the third cavity (40).

15. The electric pump of claim 8, wherein, The electric pump has an inflow channel (141), a first cavity (20) and a second cavity (30), the inflow channel (141) and the first cavity (20) are communicated, the first cavity (20) and the second cavity (30) are communicated, the electric pump comprises a pump rotor (4) and a motor rotor (6), the pump rotor (4) is located in the first cavity (20), at least part of the motor rotor (6) is located in the second cavity (30), the pump rotor (4) and the motor rotor (6) are rotationally connected; the circuit board (81) and at least part of the pins (2) are located in the second cavity (30); or the electric pump has a third cavity (40), the third cavity (40) is not communicated with the second cavity (30), the circuit board (81) and at least part of the pins (2) are located in the third cavity (40).

16. The electric pump of claim 12, wherein, The electric pump has an inlet channel (141), a first cavity (20) and a second cavity (30), the inlet channel (141) and the first cavity (20) are communicated, the first cavity (20) and the second cavity (30) are communicated, the electric pump comprises a pump rotor (4) and a motor rotor (6), the pump rotor (4) is located in the first cavity (20), at least part of the motor rotor (6) is located in the second cavity (30), the pump rotor (4) and the motor rotor (6) are rotationally connected; the circuit board (81) and at least part of the pin (2) are located in the second cavity (30); or, the electric pump has a third cavity (40), the third cavity (40) is not communicated with the second cavity (30), the circuit board (81) and at least part of the pin (2) are located in the third cavity (40).

Images