electric pump

Abstract

The present invention discloses an electric pump, which includes a first rotor unit (2), an electronic control unit, and a second rotor unit (7), the electric pump having a first cavity (10) and a second cavity (20), at least a portion of the second rotor unit (7) being located in the first cavity (10), the first rotor unit (2) being located in the second cavity (20), the first rotor unit (2) and the second rotor unit (7) being connected to each other so as to be in a transmission state, and the electronic control unit being connected to a control unit (5) and a pin ( The electric pump includes a pin 31, at least a portion of which penetrates the first cavity 10 and is electrically connected to the control unit 5. The first cavity 10 and the second cavity 20 are in communication with each other. When the electric pump is operating, the working medium flows through the second cavity 20, and part of the working medium in the second cavity 20 flows into the first cavity 10. At least a portion of the control unit 5 and at least a portion of the pin 31 come into contact with the working medium in the first cavity 10. This electric pump has the advantages of good heat dissipation and reliable operation.

Description

[Technical Field]

[0001] This application claims priority to a Chinese patent application filed with the China Patent Office on November 30, 2022, bearing application number 202223196538.3 and entitled "Electric Pump," the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the field of vehicles, and in particular to components of vehicle lubrication and / or cooling systems. [Background technology]

[0003] The electric pump provides a power source for the lubrication system and / or cooling system of the vehicle and includes an electronic control unit. When some of the electronic control units operate, they generate heat, which accumulates and cannot be immediately released. If the heat accumulates to a certain extent and cannot be immediately released, it will affect the performance of the electronic control unit and shorten the service life of the electric pump. Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE INVENTION An object of the present invention is to provide an electric pump that contributes to heat dissipation of an electronic control unit and extends the service life of the electric pump. [Means for solving the problem]

[0005] In order to achieve the above object, the electric pump of the present invention includes a first rotor unit, an electronic control unit, and a second rotor unit, the electric pump having a first cavity and a second cavity, at least a portion of the second rotor unit is located in the first cavity, the first rotor unit is located in the second cavity, the first rotor unit and the second rotor unit are connected to transmit power, the electronic control unit includes a control unit and a pin, at least a portion of the pin and at least a portion of the control unit are located in the first cavity, the pin is electrically connected to the control unit, and the first cavity and the second cavity are in communication.

[0006] The electronic control unit of the present invention includes a control unit and a pin, and at least a portion of the pin and at least a portion of the control unit are located in the first cavity. The electric pump has a first cavity and a second cavity, through which an operating medium can flow, and part of the operating medium in the second cavity can flow into the first cavity. When the operating medium is contained in the first cavity, at least a portion of the control unit and at least a portion of the pin can come into contact with the operating medium in the first cavity. As a result, the operating medium in the first cavity exchanges heat with the heat generated from the control unit and the pin, contributing to heat dissipation of the electronic control unit and extending the service life of the electric pump. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a diagram of an electric pump according to one embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view of one of FIG. [Figure 3] FIG. 2 is a structural diagram of FIG. 1 with the pump cover removed. [Figure 4] FIG. 2 is another cross-sectional view of FIG. [Figure 5] FIG. 10 is a structural diagram of the first housing in one direction. [Figure 6] FIG. 10 is a structural view of the first housing from another direction. [Figure 7] FIG. 10 is a connection diagram of the first housing and the control unit from a first viewing angle. [Figure 8] FIG. 8 is an enlarged view of part A in FIG. 7. [Figure 9] FIG. 10 is a connection diagram of the first housing and the control unit from a second viewing angle. [Figure 10] FIG. 10 is a cross-sectional view taken along line BB in FIG. 9. [Figure 11] FIG. 11 is an enlarged view of part C in FIG. [Figure 12] FIG. 10 is a structural diagram of the control unit from a first viewing angle. [Figure 13] FIG. 10 is a structural diagram of the control unit from a second viewing angle. [Figure 14] FIG. 2 is a schematic three-dimensional view of an electrical connection member. [Figure 15] FIG. 10 is a structural diagram of the electrical connection member from a first viewing angle. [Figure 16] FIG. 10 is a structural diagram of the electrical connection member from a second viewing angle. [Figure 17] FIG. 10 is a structural diagram of the electrical connection member from a third viewing angle. DETAILED DESCRIPTION OF THE INVENTION

[0008] The present invention will be further described below in conjunction with the drawings and specific examples.

[0009] In order to make those skilled in the art better understand the present invention, the present invention will be further described in detail below in combination with drawings and specific embodiments. The drawings described below are merely some examples of the present invention, and other drawings can be obtained based on these drawings. The directional terms such as "up" and "down" used in this specification are defined based on the relative positions of components in the drawings and are used merely to clearly and easily express the invention, and the directional terms used in this specification do not limit the scope of protection claimed by the present invention.

[0010] 1 to 3, the electric pump includes a pump housing 1, a first rotor unit 2, a second rotor unit 7, a stator unit 4, and an electronic control unit. The stator unit 4 surrounds the second rotor unit 7 from the radial outside of the second rotor unit 7, and the first rotor unit 2 and the second rotor unit 7 are connected to transmit power, and the electronic control unit includes a control unit 5. Furthermore, the stator unit 4 is electrically and / or signal-connected to a control unit 5, and includes a stator core 4a, an insulating frame 4b, and a winding 4c. The insulating frame 4b covers at least a portion of the surface of the stator core 4a, and the windings 4c are wound around the insulating frame 4b. When the electric pump is operating, the control unit 5 controls the stator unit 4 to generate a changing excitation magnetic field by controlling the current in the windings 4c of the stator unit 4 so that it changes according to a predetermined rule, and the excitation magnetic field causes the second rotor unit 7 to rotate, thereby directly or indirectly rotating the first rotor unit 2.

[0011] The pump housing 1 includes a first housing 11, a second housing 12, and a pump cover 13. The first housing 11 and the second housing 12, and the second housing 12 and the pump cover 13 are fixedly connected relative to each other, and the second housing 12 and the pump cover 13 are connected by screws or bolts. This arrangement makes it easier to attach and detach the electric pump, contributing to maintenance of the first rotor unit 2. Of course, the second housing 12 and the pump cover 13 may be connected in other ways, such as by plugging or engagement, and the first housing 11 and the second housing 12 may be connected by screws or bolts. The first housing 11 and the second housing 12 are fixedly connected to each other, and specifically, the first housing 11 and the second housing 12 are connected to each other by screws or bolts. This arrangement makes it easier to attach and detach the electric pump, and in this embodiment, the control unit 5 is located in the cavity between the first housing 11 and the second housing 12, which contributes to the maintenance of the control unit 5 in the electric pump, while making the connection between the first housing 11 and the second housing 12 more secure. Of course, the first housing 11 and the second housing 12 may also use other connection methods such as plugging, engagement or adhesion.

[0012] The pump housing 1 can define a pump cavity, in which the first rotor unit 2, the second rotor unit 7, the stator unit 4 and the control unit 5 are disposed, and the pump cavity includes a first cavity 10 and a second cavity 20. The first cavity 10 and the second cavity 20 are arranged to be in communication with each other, the first rotor unit 2 is located in the second cavity 20, the second rotor unit 7 (or at least a part of the second rotor unit 7) and the stator unit 4 (or at least a part of the stator unit 4) are located in the first cavity 10, at least a part of the control unit 5 is located in the first cavity 10, and the control unit 5 and the stator unit 4 are located in the same cavity, thereby reducing the axial size of the electric pump, making the structure compact, and further reducing the manufacturing cost of the electric pump. The electric pump includes a bottom wall 201 that supports the first rotor unit 2, and the bottom wall 201 separates the first cavity 10 and the second cavity 20 in the axial direction of the electric pump. In the axial direction of the electric pump, the first cavity 10 is located on one side of the bottom wall 201, and the second cavity 20 is located on the other side of the bottom wall 201. The electric pump includes a first passage 30 that penetrates the upper and lower surfaces of the bottom wall 201. When the electric pump operates, at least a portion of the working medium in the second cavity 20 flows into the first cavity 10 through the first passage 30, thereby providing the first cavity 10 with sufficient working medium to cool the second rotor unit 7, the stator unit 4 and the control unit 5. The working medium is, for example, a liquid such as oil.

[0013] The first rotor unit 2 includes a first rotor 21 and a second rotor 22, the first rotor 21 including a plurality of external teeth, and the second rotor 22 including a plurality of internal teeth, and a hydraulic chamber 23 is formed between the external teeth of the first rotor 21 and the internal teeth of the second rotor 22. In this embodiment, the hydraulic chamber 23 is a part of the second cavity 20 . When the first rotor unit 2 rotates, there is a certain eccentric distance between the first rotor 21 and the second rotor 22, and when the first rotor 21 rotates, some of the internal teeth of the second rotor 22 mesh with some of the external teeth of the first rotor 21, thereby rotating the second rotor 22, and the volume within the hydraulic chamber 23 changes as the first rotor 21 and the second rotor 22 rotate one revolution. Specifically, when the first rotor unit 2 rotates from the starting position to a certain angle, the volume in the hydraulic chamber 23 gradually increases, forming a partial vacuum, and the working medium is then sucked into the hydraulic chamber 23 from the first passage 30 of the electric pump. As the first rotor 21 and the second rotor 22 continue to rotate, the volume of the hydraulic chamber 23 filled with the working medium gradually decreases, and the working medium is pressed, so that the working medium entering the hydraulic chamber 23 is pushed out to the outlet 8 of the electric pump to generate power for flow.

[0014] The electric pump further includes a rotating unit that is connected to transmit power to the second rotor unit 7 and the first rotor unit 2, and includes a pump shaft 6 that is capable of rotating the first rotor 21. In this embodiment, one end of the pump shaft 6 is connected to a part of the first rotor unit 2, and the other end is connected to the second rotor unit 7; for example, the pump shaft 6 is connected to the first rotor unit 2 and the second rotor unit 7 so as to transmit power, and the second rotor unit 7 rotates the first rotor 21 via the pump shaft 6, which further realizes the rotation of the first rotor unit 2. The pump shaft 6 includes a second passage 40 that penetrates the first end face and the second end face of the pump shaft 6. When the electric pump is operating, the pressure of the working medium at the inlet of the first passage 30 is greater than the pressure of the working medium at the outlet of the second passage 40. As a result, the working medium creates a pressure difference between the inlet of the first passage 30 and the outlet of the second passage 40, and based on the principle that the working medium flows from a high-pressure area to a low-pressure area, the working medium in the second cavity 20 flows toward the outlet of the second passage 40. Since the stator unit 4 and the control unit 5 are located in the first cavity 10, the working medium absorbs some of the heat from the stator unit 4 and the control unit 5, further improving the heat dissipation efficiency of the stator unit 4 and the control unit 5.

[0015] Combining FIGS. 4 to 8, the electronic control unit includes a pin 31. At least a portion of this pin 31 enters the first cavity 10 and is electrically connected to the control unit 5, and when the electric pump operates, the operating medium flows through the second cavity 20, and some of the operating medium in the second cavity 20 flows into the first cavity 10, and at least a portion of the control unit 5 and at least a portion of the pin 31 come into contact with the operating medium in the first cavity 10. In this way, the operating medium in the first cavity 10 exchanges heat with the heat generated by the control unit 5 and the pins 31, contributing to heat dissipation of the electronic control unit and extending the service life of the electric pump. Furthermore, this arrangement can accommodate the needs of electric pumps of different powers, especially high-power electric pumps, and eliminates the need to arrange an extra heat dissipation structure to dissipate heat from the control unit 5 and the pins 31, simplifying the structure of the electric pump and reducing the manufacturing costs of the electric pump.

[0016] The pin 31 and the first housing 11 are fixed by injection molding, and the first housing 11 is provided with an insertion opening 115, which protrudes from the outer surface of the first housing 11 in a direction away from the first housing 11, and a part of the pin 31 fits into the insertion opening 115.

[0017] The first housing 11 includes a first side wall 111 and an end wall 112, the first side wall 111 being located on one side of the end wall 112, the first side wall 111 and the end wall 112 forming a cavity surrounding the first housing 11, and the cavity of the first housing 11 being part of the first cavity 10. In this embodiment, the first side wall 111 and the end wall 112 are injection molded as a single unit, thereby improving the sealing performance. Of course, the first side wall 111 and the end wall 112 may be molded separately and then fixedly connected and sealed. In this way, the mold for the formed first side wall 111 and end wall 112 is simple.

[0018] The pin 31 and the end wall 112 are fixed by injection molding, and in order to improve the reliability of the connection between the pin 31 and the first housing 11, a step portion 113 is formed in the end wall 112. This step portion 113 protrudes from the inner surface of the end wall 112 in a direction approaching the control unit 5, and the pin 31 passes through the step portion 113. There is a pitch between the step 113 and the first side wall 111 to ensure injection molding conformity.

[0019] The pin 31 includes a first portion 311 , a second portion 312 and a third portion 313 . The second portion 312 of the pin 31 and the first housing 11 are integrally injection molded and fixed together, and the first portion 311 of the pin 31 enters the first cavity 10 and is electrically connected to the control unit 5. In this embodiment, the first housing 11 has an insertion opening 115, which protrudes from the outer surface of the first housing 11 in a direction away from the first housing 11, and the third part 313 of the pin 31 fits into the insertion opening 115.

[0020] 7 to 13, the control unit 5 includes a circuit board 51 that is electrically connected to the pins 31. Specifically, the control unit 5 includes an electrical connection member 52 electrically connected to the circuit board 51, and the pins 31 are connected to the electrical connection member 52. The electrical connection member 52 realizes the electrical connection between the pins 31 and the circuit board 51, thereby realizing fixing without welding and simplifying the operation method. Furthermore, the electrical connection member 52 provides electrical connection between the first portion 311 of the pin 31 and the circuit board 51 . The number of electrical connection members 52 is equal to the number of pins 31 and corresponds to each other, and one pin 31 and one electrical connection member 52 are inserted and engaged with each other, thereby improving the reliability of the connection between the pins 31 and the circuit board 51. The first housing 11 further includes positioning portions 114 that are inserted into the positioning holes 53 of the circuit board 51, and the number of positioning portions 114 and the number of positioning holes 53 are equal and correspond to each other, so that one positioning portion 114 and one positioning hole 53 are engaged with each other, thereby ensuring a secure connection between the pins 31 and the circuit board 51.

[0021] 1 to 17, the electrical connection member 52 includes a conductive portion 521 and a main body portion 522, at least a portion of the pin 31 contacts the conductive portion 521, at least a portion of the conductive portion 521 protrudes from the circuit board 51 and is located in the first cavity 10, and the conductive portion 521 contacts the operating medium in the first cavity 10 and has a large heat dissipation area. The body portion 522 penetrates the circuit board 51 and is located in the first cavity 10, contacting the operating medium in the first cavity 10, and the body portion 522 has a large heat dissipation area. The first portion 311 of the pin 31 enters the first cavity 10 and is electrically connected to the control unit 5, the first portion 311 includes a first sub-portion 311a and a second sub-portion 311b, the first sub-portion 311a is connected to the second sub-portion 311b and penetrates the circuit board 51 to increase the heat dissipation area of ​​the pin 31, a portion of the first sub-portion 311a is located in the jack 522a, and at least a portion of the second sub-portion 311b contacts the conductive portion 521 and contributes to the electrical connection between the pin 31 and the conductive portion 521. The pin 31 further includes a third sub-portion 311c. The third sub-portion 311c extends further away from the circuit board 51 than the second sub-portion 311b. The third sub-portion 311c is located within the first cavity 10 and contacts the operating medium therein, increasing the heat dissipation area of ​​the pin 31 to suit the needs of electric pumps of different power, especially high-power electric pumps. This eliminates the need for an additional heat dissipation structure to dissipate heat from the pin 31, thereby simplifying the structure of the electric pump and reducing the manufacturing costs of the electric pump. At the same time, the axial tolerance when installing the pin 31 can be accommodated, ensuring a reliable electrical connection between the pin 31 and the electrical connecting member 52. The conductive portion 521 includes at least one spring 5211, which is located in the first cavity 10 to increase the contact area between the conductive portion 521 and the pin 31, and further improve the reliability of the electrical connection between the pin 31 and the electrical connection member 52. A portion of the spring 5211 extends at an angle in a direction approaching the central axis of the jack 522a (or in a direction approaching the central axis of the electrical connection member 52), and another portion extends at an angle in a direction away from the central axis of the jack 522a (or in a direction approaching the central axis of the electrical connection member 52), and at least a portion of the second sub-portion 311b contacts the spring 5211 to realize an electrical connection between the pin 31 and the electrical connection member 52. Specifically, the spring 5211 includes a first inclined portion 5211a, a buffer portion 5211b, and a second inclined portion 5211c. The buffer portion 5211b connects the first inclined portion 5211a and the second inclined portion 5211c. At least a portion of the second sub-portion 311b contacts the buffer portion 5211b. One end of the first inclined portion 5211a is connected to the main body 522 and the other end is connected to the buffer portion 5211b. The first inclined portion 5211a extends at an incline toward the central axis of the jack 522a. The second inclined portion 5211c extends at an incline away from the central axis of the jack 522a. When pin 31 passes through jack 522a and contacts spring 5211, it presses spring 5211 in a direction away from the central axis of jack 522a. Spring 5211 can generate elastic deformation, thereby reducing the resistance encountered when pin 31 is inserted into jack 522a and reducing the operating strength required when pin 31 is inserted into circuit board 51. The reset elastic force of spring 5211 maintains good contact between spring 5211 and pin 31, enabling elastic insertion / removal and engagement between pin 31 and electrical connecting member 52, and improving the reliability of the connection between pin 31 and electrical connecting member 52.

[0022] In this embodiment, the number of springs 5211 is two, and the two springs 5211 are arranged opposite each other, which simplifies the structure, facilitates processing and molding, and reduces the manufacturing cost. The number of springs 5211 is more than two, and the multiple springs 5211 are arranged along the circumferential direction of the jack 522a. After the pin 31 is inserted into the jack 522a, it can come into contact with the multiple springs 5211, further increasing the contact area between the pin 31 and the conductive part 521 and improving the reliability of the connection between the pin 31 and the electrical connection member 52. In addition, the acting force of the multiple springs 5211 further balances the force received by the pin 31 in the circumferential direction, preventing situations such as tilting or displacement of the pin 31, thereby improving the reliability of the connection between the pin 31 and the electrical connection member 52. Before the pin 31 is inserted into the jack 522a, the pitch between the buffer portions 5211b of the multiple springs 5211 is small, and during the process of inserting the pin 31, the pitch between the buffer portions 5211b of the multiple springs 5211 gradually increases to clamp the pin 31 and securely fix it.

[0023] The main body 522 is fixedly connected to the circuit board 51 and realizes mechanical and electrical connections between the electrical connection member 52 and the circuit board 51 . The main body portion 522 includes a base portion 522b and at least one connection portion 522c. The base 522b is connected to the connecting portion 522c, which is fixedly connected to the circuit board 51, thereby realizing a fixed connection and an electrical connection between the main body 522 and the circuit board 51. At least a portion of the base 522b protrudes from the circuit board 51, and the base 522b and the operating medium in the first cavity 10 have a large contact area, thereby improving the heat dissipation effect. For example, the connection portion 522c is fixed to the circuit board 51 by welding. The base portion 522b is connected to the spring 5211, and the connection portion 522c is connected to the spring 5211, thereby realizing an electrical connection between the main body portion 522 and the spring 5211. The base 522b includes a jack 522a, at least a portion of which is located within the circuit board 51, the jack 522a is connected to the first cavity 10, a portion of the first sub-portion 311a is located within the jack 522a, and the first sub-portion 311a and the base 522b are arranged with a gap therebetween, and the first sub-portion 311a and the operating medium in the first cavity 10 have a large contact area, thereby improving the heat dissipation effect. The base 522b is connected to one end of the spring 5211, and the base 522b is provided with an escape space 522d for causing elastic deformation in the spring 5211, thereby making it easier for elastic deformation to occur in the spring 5211 and reducing the insertion strength of the pin 31 and the difficulty of installation. A part of the third sub-portion 311c is located outside the base portion 522b, and the third sub-portion 311c and the working medium in the first cavity 10 have a large contact area, which improves the heat dissipation effect. In this embodiment, the electrical connection member 52 includes two connection portions 522c. The connection portion 522c is fixed by welding to the circuit board 51, and the circuit board 51 includes a first surface 511 and a second surface 512 that face each other. Furthermore, the first surface 511 is closer to the end wall 112 of the first housing 11 than the second surface 512, and the connection portion 522c is fixed to the first surface 511 of the circuit board 51 by welding. One end of base 522b is connected to connecting portion 522c, and the other end penetrates circuit board 51 and extends in a direction away from second surface 512. Since base 522b penetrates circuit board 51 and circuit board 51 has a certain thickness, this is equivalent to a reinforcing structure being formed around the outer periphery of base 522b, which provides support and fixing to base 522b.

[0024] Here, the above examples do not limit the present invention, but are merely used to explain the present invention. The present invention has been described in detail in this specification with reference to the above examples, but amendments or equivalent replacements can be made to this application, and all improvements that do not deviate from the spirit and scope of the present invention should fall within the scope of the claims of this application. [Explanation of symbols]

[0025] 1 Pump housing 11. First housing 111 First side wall 112 End wall 113...Double section 114 Positioning part 115 Insertion port 12 Second housing 13 Pump cover 2. First rotor unit 21 First rotor 22 Second rotor 23 Hydraulic chamber 4. Stator unit 4a Stator core 4b Insulation frame 4c ···winding 5. Control unit 51 Circuit board 511...Front page 512...2nd page 52 Electrical connection member 521 Conductive part 5211 Spring 5211a...1st slope 5211b...Buffer section 5211c...Second slope part 522 Main body 522a ···Jack 522b...Base 522c...Connection 522d...escape space 53 Positioning hole 6 Pump shaft 7. Second rotor unit 8... spout 10 First cavity 20...Second cavity 201 Bottom wall 30...1st aisle 31 pins 311...Part 1 311a...First subpart 311b...Second subpart 311c...Third subpart 312...Second part 313...3rd part 40...2nd aisle

Claims

1. An electric pump comprising a first rotor unit (2), an electronic control unit and a second rotor unit (7), A first cavity (10) and a second cavity (20), At least a portion of the second rotor unit (7) is located in the first cavity (10); The first rotor unit (2) is located in the second cavity (20), The first rotor unit (2) and the second rotor unit (7) are connected to each other so as to transmit power; The electronic control unit includes a control unit (5) and a pin (31); At least a part of the pin (31) and at least a part of the control unit (5) are located in the first cavity (10); The pin (31) is electrically connected to the control unit (5), The electric pump is characterized in that the first cavity (10) communicates with the second cavity (20).

2. The control unit (5) includes a circuit board (51) and an electrical connection member (52); The electrical connection member (52) is fixed to and connected to the circuit board (51) and is electrically connected to the circuit board (51), and includes a conductive portion (521). At least a portion of the pin (31) contacts the conductive portion (521); The electric pump according to claim 1, wherein at least a portion of the conductive portion (521) protrudes from the circuit board (51) and is positioned in the first cavity (10).

3. The pin (31) includes a first portion (311), the first part (311) is located in the first cavity (10) and is electrically connected to the control unit (5), and includes a first sub-part (311a) and a second sub-part (311b); The first sub-portion (311a) is connected to the second sub-portion (311b) and penetrates the circuit board (51); The electric pump according to claim 2, wherein at least a part of the second sub-portion (311b) is in contact with the conductive portion (521).

4. The first portion (311) of the pin (31) includes a third sub-portion (311c), The electric pump according to claim 3, wherein the third sub-portion (311c) is located in the first cavity (10) and extends in a direction away from the circuit board (51) more than the second sub-portion (311b).

5. The electrical connection member (52) includes a main body (522), The main body portion (522) penetrates the circuit board (51) and is positioned in the first cavity (10), The conductive portion (521) includes at least one spring (5211), The spring (5211) is located in the first cavity (10), One end of the spring (5211) is connected to the main body (522), A portion of the spring (5211) extends at an incline toward the central axis of the electrical connection member (52), and another portion extends at an incline toward the central axis of the electrical connection member (52), The electric pump according to any one of claims 3 to 4, wherein at least a part of the second sub-portion (311b) is in contact with the spring (5211).

6. The body portion (522) includes a base portion (522b) and at least one connecting portion (522c), The base portion (522b) is connected to the connecting portion (522c), The connection portion (522c) is fixed to and connected to the circuit board (51), At least a portion of the base (522b) protrudes from the circuit board (51); The electric pump according to claim 5, wherein the base (522b) is connected to one end of the spring (5211).

7. The circuit board (51) includes a first surface (511) and a second surface (512) that face each other, The connection portion (522c) is located on a first surface of the circuit board (51), The electric pump of claim 6, characterized in that one end of the base portion (522b) is connected to the connection portion (522c) and the other end passes through the circuit board (51) and extends in a direction away from the second surface (512).

8. The base (522b) includes a jack (522a), At least a portion of the jack (522a) is located within the circuit board (51); The jack (522a) communicates with the first cavity (10), A portion of the first sub-portion (311a) is located within the jack (522a), The electric pump according to any one of claims 6 to 7, wherein the first sub-portion (311a) and the base portion (522b) are provided so as to have a gap therebetween.

9. The electric pump includes a bottom wall (201) that supports the first rotor unit (2); The electric pump includes a first passage (30); The electric pump according to any one of claims 1 to 4, characterized in that the first passage (30) passes through the upper and lower surfaces of the bottom wall (201) and communicates with the first cavity (10) and the second cavity (20).

10. The electric pump includes a bottom wall (201) that supports the first rotor unit (2); The electric pump includes a first passage (30); 6. The electric pump according to claim 5, wherein the first passage (30) passes through the upper and lower surfaces of the bottom wall (201) and communicates with the first cavity (10) and the second cavity (20).

11. The electric pump includes a bottom wall (201) that supports the first rotor unit (2); The electric pump includes a first passage (30); The electric pump according to any one of claims 6 to 7, characterized in that the first passage (30) passes through the upper and lower surfaces of the bottom wall (201) and communicates with the first cavity (10) and the second cavity (20).

12. The electric pump includes a bottom wall (201) that supports the first rotor unit (2); The electric pump includes a first passage (30); 9. The electric pump according to claim 8, wherein the first passage (30) passes through the upper and lower surfaces of the bottom wall (201) and communicates with the first cavity (10) and the second cavity (20).

13. The electric pump further includes a pump shaft (6); the pump shaft (6) is connected to the first rotor unit (2) and the second rotor unit (7) in a transmitting manner and includes a second passage (40); The second passage (40) passes through the first end surface and the second end surface of the pump shaft (6), 10. The electric pump according to claim 9, wherein when the electric pump is operating, the pressure of the working medium at the inlet of the first passage (30) is greater than the pressure of the working medium at the outlet of the second passage (40).

14. The electric pump further includes a pump shaft (6); the pump shaft (6) is connected to the first rotor unit (2) and the second rotor unit (7) in a transmitting manner and includes a second passage (40); The second passage (40) passes through the first end surface and the second end surface of the pump shaft (6), 13. The electric pump according to claim 10 or 12, characterized in that, when the electric pump is operating, the pressure of the working medium at the inlet of the first passage (30) is greater than the pressure of the working medium at the outlet of the second passage (40).

15. The electric pump further includes a pump shaft (6); the pump shaft (6) is connected to the first rotor unit (2) and the second rotor unit (7) in a transmitting manner and includes a second passage (40); The second passage (40) passes through the first end surface and the second end surface of the pump shaft (6), 12. The electric pump according to claim 11, wherein when the electric pump is operating, the pressure of the working medium at the inlet of the first passage (30) is greater than the pressure of the working medium at the outlet of the second passage (40).

Images