Electric pump

Abstract

The utility model relates to an electric pump, the electric pump comprises a temperature detection unit, a circuit board and a separator, the electric pump comprises an electric connection part, the separator and the electric connection part are fixed in an injection molding mode, and the end, located on the side, relatively close to the circuit board, of the separator, of the electric connection part is electrically connected with the circuit board. The electric pump comprises a motor cavity, the motor cavity is communicated with a cavity inflow channel of the electric pump, the temperature detection unit is located in the motor cavity, the temperature detection unit comprises a pin part, and the electric connection part is located at the end of the side, relatively away from the circuit board, of the isolation piece and fixedly connected with the pin part. The application has the characteristic of improving the reliability of the temperature detection unit.

Description

Technical Field

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

[0002] The electric pump provides a power source for the vehicle's cooling system and / or lubrication system. The electric pump includes a temperature detection unit, a motor housing and a partition. The temperature detection unit is used as an insert for injection molding to form the partition. The motor housing and the partition are fixedly connected to form a motor cavity. When the electric pump is working, the working medium of the lubrication system and / or the cooling system will flow into the motor cavity. At least part of the temperature detection unit is located in the motor cavity to detect the temperature of the working medium. When the temperature detection unit is used as an insert for injection molding to form the partition, since the temperature detection unit is in a high-temperature environment, its surface protective layer is damaged by the high temperature over a large area, resulting in a large area of the leads and detection chip of the temperature detection unit being corroded by the working medium, thereby reducing the detection reliability of the temperature detection unit. Utility Model Content

[0003] The present application provides an electric pump, which is beneficial to improving the reliability of the temperature detection unit.

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

[0005] An electric pump, which includes a temperature detection unit, a circuit board and an isolation member. The electric pump includes an electrical connection portion, the isolation member is injection-molded and fixed to the electrical connection portion, the electrical connection portion is located at the end of the isolation member on a side relatively close to the circuit board and is electrically connected to the circuit board, the electric pump includes a motor cavity, the motor cavity is connected to the cavity inlet channel of the electric pump, the temperature detection unit is located in the motor cavity, the temperature detection unit includes a pin portion, and the electrical connection portion is located at the end of the isolation member on a side relatively far from the circuit board and is fixedly connected to the pin portion.

[0006] In the above technical solution, the isolating member is fixed to the electrical connection portion by injection molding, and the electrical connection portion is located at the end of the isolating member on the side relatively far away from the circuit board and is fixedly connected to the pin portion; compared with the temperature detection unit being fixed to the isolating member by injection molding, the temperature detection unit is connected to the circuit board by fixing the pin portion of the temperature detection unit to the electrical connection portion, thereby reducing damage to the pin portion during injection molding and reducing damage to the pin portion by the working medium, which is beneficial to improving the reliability of the temperature detection unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A schematic diagram of the electric pump of this application;

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

[0009] Figure 3 A schematic diagram of the connection between the isolation element, the temperature detection unit and the circuit board;

[0010] Figure 4 for Figure 3 Schematic diagram of the AA section;

[0011] Figure 5 is a schematic diagram of an embodiment of the connection between the isolation element and the temperature detection unit;

[0012] Figure 6 for Figure 5 An enlarged schematic diagram of part B;

[0013] Figure 7 for Figure 5 Schematic diagram of the CC section;

[0014] Figure 8 for Figure 7 An enlarged schematic diagram of part D in the middle;

[0015] Figure 9 is a schematic diagram of another embodiment of the connection between the isolation element and the temperature detection unit;

[0016] Figure 10 yes Figure 9 Schematic diagram of the EE section;

[0017] Figure 11 yes Figure 10 A magnified schematic diagram of part F;

[0018] Figure 12 This is a schematic diagram of an embodiment of the electrical connection portion of the present application;

[0019] Figure 13 This is a schematic diagram of an embodiment of a temperature detection unit of the present application.

[0020] Reference numerals: 1, pump housing; 11, pump cover; 111, first inlet channel; 112, second inlet channel; 113, outlet channel; 12, motor housing; 121, cavity outlet channel; 13, spacer; 131, accommodating portion; 1311, accommodating groove; 1312, lead groove; 1312a, side wall; 1312b, bottom wall; 132, electrical connection portion; 1321, first subsection (or welding portion); 1322, second subsection; 1323, third subsection; 133, reinforcement portion; 134, extension portion; 135, partition; 14, bottom cover; 2, temperature detection unit; 21, fixing portion; 21a, fixed part; 21b, first fixed part; 21c, second fixed part; 22, supporting part; 22b, first supporting part; 22c, second supporting part; 221, first part; 222, second part; 223, third part; 23, temperature sensing part; 24, pin part; 3, protection part; 31, first protection part; 32, second protection part; 4, first rotor assembly; 41, inner rotor; 42, outer rotor; 5, stator assembly; 6, second rotor assembly; 7, pump shaft; 71, cavity inlet channel; 73, opening; 8, circuit board; 9, sealing part; 20, pump cavity; 30, motor cavity; 40, electronic control cavity. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other technical solutions can be obtained based on these technical solutions without paying any creative work. The directional words such as upper and lower involved in this article are defined by the positions of the parts relative to each other shown in the accompanying drawings. They are only for the clarity and convenience of expressing the technical solutions. It should be understood that the directional words used in this article should not limit the scope of protection requested by this application.

[0022] Electric pumps can be used in automotive lubrication and / or cooling systems to provide circulating power for the working medium in the automotive lubrication and / or cooling systems, which in turn can provide lubricating and / or cooling oil to the transmission system. In this application, "A and B are fixedly connected" means that there is no relative displacement between A and B after the connection, for example, when A and B are welded together; "A and B are limitedly connected" means that A limits B's movement in a certain direction, or B limits A's movement in a certain direction.

[0023] Please refer to Figures 1 to 2The electric pump includes a pump housing 1, which includes a pump cover 11, a motor housing 12, a bottom cover 14, and an isolator 13. The pump cover 11 is fixedly connected to the motor housing 12, the motor housing 12 is fixedly connected to the isolator 13, and the bottom cover 14 is fixedly connected to the isolator 13. For example, the motor housing 12, the bottom cover 14, and the isolator 13 are connected by screws, which facilitates the disassembly and assembly of the electric pump. The electric pump includes a first rotor assembly 4, a stator assembly 5, a second rotor assembly 6, a pump shaft 7, and a circuit board. The stator assembly 5 is electrically connected to the circuit board. The stator assembly 5 surrounds the second rotor assembly 6 from the radially outer side of the second rotor assembly 6. The pump shaft 7 is transmission-connected to the second rotor assembly 6. The isolator 13 includes a partition 135. In the axial direction of the electric pump, the stator assembly 5 is located on one side of the partition 135, and the circuit board 8 is located on the other side of the partition 135. The electric pump has a pump chamber 20, a motor chamber 30 and an electronic control chamber 40. The pump chamber 20 is connected to the motor chamber 30, and the motor chamber 30 and the electronic control chamber 40 are not connected. The first rotor assembly 4 (or at least part of the first rotor assembly 4) is located in the pump chamber 20, the second rotor assembly 6 (or at least part of the second rotor assembly 6), at least part of the pump shaft 7, and the stator assembly 5 (or at least part of the stator assembly 5) are located in the motor chamber 30. When the electric pump is working, the pump chamber 20 can have a working medium, and at least part of the working medium of the pump chamber 20 flows into the motor chamber 30. The circuit board 8 is located in the electronic control chamber 40, which is beneficial for the circuit board 8 to be not affected by the working medium.

[0024] Please refer to Figure 2 The stator assembly 5 includes a stator core (not shown) and windings (not shown). When the electric pump is operating, the control assembly controls the current in the windings 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 second rotor assembly 6 rotates under the action of the excitation magnetic field, and the second rotor assembly 6 can directly or indirectly drive the first rotor assembly 4 to rotate. In this embodiment, the pump shaft 7 is transmission-connected to the first rotor assembly 4 and the second rotor assembly 6. Specifically, one side of the pump shaft 7 is connected to the inner rotor 41, and the other side of the pump shaft 7 is connected to the second rotor assembly 6. The second rotor assembly 6 drives the inner rotor 41 to rotate via the pump shaft 7, thereby achieving rotation of the first rotor assembly 4. The outer rotor 42 is located on the outer periphery of the inner rotor 41. The inner rotor 41 and the outer rotor 42 are internally meshed. In other embodiments, the inner rotor 41 and the outer rotor 42 can also be externally meshed. In this case, the inner rotor 41 and the outer rotor 42 are arranged side by side. In this embodiment, the central axis of the inner rotor 41 is offset from the central axis of the outer rotor 42. That is, there is a certain eccentricity between the central axis of the inner rotor 41 and the central axis of the outer rotor 42. When the inner rotor 41 rotates, at least part of the external teeth of the inner rotor 41 meshes with at least part of the internal teeth of the outer rotor 42, so that the inner rotor 41 can drive the outer rotor 42 to rotate.

[0025] The electric pump includes an inlet channel and an outlet channel 113. In this embodiment, the inlet channel includes a first inlet channel 111 and a second inlet channel 112. The first inlet channel 111 and the second inlet channel 112 are used for the inflow of the working medium, and the outlet channel 113 is used for the outflow of the working medium. The electric pump has a cavity inlet channel 71 and a cavity outlet channel 121. The second inlet channel 112 is connected to the cavity inlet channel 71, and the cavity inlet channel 71 is connected to the motor cavity 30. The cavity outlet channel 121 is connected to the motor cavity 30. The working medium can enter the motor cavity 30 from the cavity inlet channel 71, allowing the working medium to exchange heat with the heat generated by the stator assembly 5 located in the motor cavity 30, thereby facilitating heat dissipation of the stator assembly 5. The pressure of the working medium at the inlet of the cavity inlet flow channel 71 is greater than the pressure of the working medium at the outlet of the cavity outlet flow channel 121, so that a pressure difference is formed between the inlet of the cavity inlet flow channel 71 and the outlet of the cavity outlet flow channel 121. According to the principle that the working medium flows from a high pressure area to a low pressure area, the working medium in the motor cavity 30 can flow toward the outlet of the cavity outlet flow channel 121, that is, part of the working medium in the motor cavity 30 can flow out of the motor cavity 30 from the cavity outlet flow channel 121.

[0026] As described in the background technology, the partition is formed by injection molding with the temperature detection unit as an insert. Since the temperature detection unit is in a high-temperature environment, its surface protective layer is damaged by the high temperature over a large area, resulting in a large area of corrosion of the leads and detection chips of the temperature detection unit by the working medium in the motor cavity, and the detection reliability of the temperature detection unit is reduced. If the protective layer is added after injection molding, the process is complicated, and due to the impact of the working medium, the reliability of the connection between the pins of the temperature detection unit and the partition may be low.

[0027] Please refer to Figures 2 to 13 The electric pump includes an electrical connection part 132, which is fixed to the isolation member 13 by injection molding. For example, at least a portion of the isolation member 13 is formed by injection molding with the electrical connection part 132 as an insert; the electric pump includes a protection part 3 and a temperature detection unit 2, the temperature detection unit 2 is located in the motor cavity 30, the electrical connection part 132 is located at the end of the isolation member 13 relatively close to the circuit board 8 and is electrically connected to the circuit board 8, the temperature detection unit 2 includes a pin part 24, the electrical connection part 132 is located at the end of the isolation member relatively away from the circuit board 8 and is fixedly connected to the pin part 24, compared with the temperature detection unit being fixed to the isolation member by injection molding, the temperature detection unit 2 is connected to the circuit board 8 by fixing the pin part 24 of the temperature detection unit 2 to the electrical connection part 132, thereby reducing the damage to the pin part 24 during injection molding, and reducing the damage to the pin part 24 by the working medium, which is beneficial to improving the reliability of the temperature detection unit 2.

[0028] The pin portion 24 includes a fixed portion 21, the fixed portion 21 includes a fixed sub-portion 21a, the electrical connection portion 132 is welded and fixed to the fixed sub-portion 21a, the electric pump includes a protective portion 3, the protective portion 3 includes a first protective portion 31, and the first protective portion 31 covers at least part of the fixed sub-portion 21a; when the electrical connection portion 132 is fixed to the fixed portion 21, the surface protective layer of the fixed sub-portion 21a may be damaged. By covering the first protective portion 31 outside the fixed sub-portion 21a, the damage to the fixed sub-portion 21a caused by the working medium is reduced, which is beneficial to improving the reliability of the temperature detection unit 2; further, the first protective portion 31 covers the fixed sub-portion 21a, and the contact area between the first protective portion 31 and the fixed sub-portion 21a is large, which can reduce the damage to the fixed sub-portion 21a caused by the working medium, which is beneficial to improving the reliability of the temperature detection unit 2. In one embodiment, the first protective portion 31 is an isolation coating, for example, after the electrical connection portion 132 and the fixed portion 21a are welded and fixed, the isolation coating is sprayed on the surface of the fixed portion 21a; in another embodiment, the first protective portion 31 is an isolation glue, for example, after the electrical connection portion 132 and the fixed portion 21a are welded and fixed, flowing glue is injected to cover the surface of the fixed portion 21a, and then solidified to form an isolation glue.

[0029] Please refer to Figures 3 to 13 The temperature detection unit 2 includes a fixing portion 21 and a supporting portion 22. The fixing portion 21 includes a fixing sub-portion 21a. The supporting portion 22 includes a first portion 221. The first portion 221 is connected to the fixing portion 21. The isolating member 13 includes a receiving portion 131. The fixing portion 21 and the first portion 221 are located in a receiving groove 1311 of the receiving portion 131. When the electric pump is operating, the motor cavity 30 contains a working medium. The receiving portion 131 can mitigate the impact force of the working medium on the fixing portion 21 and the first portion 221, thereby reducing damage to the protective layer of the fixing portion 21 and the protective layer of the first portion 221, thereby improving the fixing reliability of the temperature detection unit 2.

[0030] The accommodating portion 131 includes a lead groove 1312, which is connected to the accommodating groove 1311. The supporting portion 22 includes a second portion 222, which is located in the lead groove 1312. The protecting portion 3 includes a second protecting portion 32, which covers at least part of the second portion 222. When the electric pump is working, there is a working medium in the motor cavity 30, and the supporting portion 22 will shake due to the impact force of the working medium. The second protecting portion 32 can reduce the force between the second portion 222 and the groove wall of the lead groove 1312, which is beneficial to reducing damage to the second portion 222, thereby facilitating improving the reliability of the temperature detection unit 2; further, the second protecting portion 32 covers the second portion 222, and the contact area between the second protecting portion 32 and the second portion 222 is larger, which is beneficial to reducing damage to the second portion 222, thereby facilitating improving the reliability of the temperature detection unit 2. In one embodiment, the second protection portion 32 is a fixed glue, for example, a flowing glue is injected to cover the second portion 222, and then solidified to form a fixed glue. The isolation glue and the fixed glue are the same substance. Of course, the isolation glue and the fixed glue can be different substances. In one embodiment, the second protection portion 32 is bonded and fixed to the groove wall of the lead groove 1312; or, the groove wall of the lead groove 1312 includes a bottom wall 1312b and a side wall 1312a, and the bottom wall 1312b is connected to the side wall 1312a. At least one of the bottom wall 1312b and the side wall 1312a is bonded and fixed to the second portion 222, which is beneficial to improve the fixing strength of the temperature detection unit 2. In one embodiment, please refer to Figure 8 The groove wall of the lead groove 1312 includes a bottom wall 1312b, and the second part 222 contacts the bottom wall 1312b. When the temperature detection unit 2 is fixed, the bottom wall 1312b can limit the position of the support part 22, thereby limiting the position of the temperature sensing part 23, which is beneficial to mass production; in the axial direction of the electric pump, the shortest distance D1 from the bottom wall 1312b to the bottom wall of the isolation member 13 is greater than the shortest distance D2 from the temperature sensing part 23 to the bottom wall of the isolation member 13. When the temperature detection unit 2 is fixed, the temperature sensing part 23 can avoid contacting the bottom wall of the isolation member 13, and the contact area between the temperature sensing part 23 and the working medium is larger, which is beneficial to improving the reliability of the temperature detection unit 2.

[0031] Please refer to Figures 3 to 13 The temperature detection unit 2 includes a temperature sensing portion 23, and the supporting portion 22 includes a third portion 223. The third portion 223 is located between the second portion 222 and the temperature sensing portion 23. There is a distance between the third portion 223 and the groove wall of the accommodating groove 1311. The length of the third portion 223 is less than the length of the first portion 221. The temperature sensing portion 23 is located outside the accommodating groove 1311 and can contact the working medium more quickly, thereby detecting the temperature of the working medium in time; secondly, the third portion 223 is located outside the accommodating groove 1311, the length of the third portion 223 is small, the torque of the third portion 223 is small, and the third portion 223 shakes less due to the impact of the working medium, which is beneficial to improving the reliability of the temperature detection unit 2.

[0032] Please refer to Figure 3 、 Figure 4 and Figures 9 to 13 The electrical connection portion 132 includes a first sub-portion (or welding portion) 1321, a second sub-portion 1322 and a third sub-portion 1323. The second sub-portion 1322 is located between the first sub-portion (or welding portion) 1321 and the third sub-portion 1323. The first sub-portion (or welding portion) 1321 is located in the motor cavity 30, and the third sub-portion 1323 is located in the electric control cavity 40. Specifically, the first sub-portion (or welding portion) 1321 is located in the receiving groove 1311, and the first sub-portion (or welding portion) 1321 is located in the receiving groove 1311. The electric pump is welded and fixed to the fixed section 21a. The sealing portion 9 covers at least a portion of the first section 1321 and at least a portion of the bottom wall of the receiving groove 1311. The electrical connection portion 132 is used as an insert and injection molded to form the isolation member 13. Due to the difference in material between the electrical connection portion 132 and the isolation member 13, there is a microscopic gap at the junction of the electrical connection portion 132 and the isolation member 13. The sealing portion 9 can cover this gap, which helps prevent the working medium from leaking through the gap when the electric pump is operating. Furthermore, the sealing portion 9 also covers the fixed section 21a. The sealing portion 9 can improve the fixing strength between the temperature detection unit 2 and the electrical connection portion 132. Furthermore, the sealing portion 9 covers the fixed section 21, the first portion 221, and the second portion 222. The contact area between the temperature detection unit 2 and the sealing portion 9 is relatively large, which helps improve the fixing strength of the temperature detection unit 2. The sealing part 9 and the protective part 3 are of an integral structure, for example, the sealing part 9 and the protective part 3 are formed by solidifying the fluid glue, and the sealing part 9 and the protective part 3 are formed simultaneously by one injection of glue, the process is simple, and the first protective part 31, the second protective part 32 and the sealing part 9 are of the same material; or the sealing part 9 and the protective part 3 are of a separate structure, and the sealing part 9 covers at least part of the protective part 3, for example, the first fluid glue is first solidified to form the protective part 3 (the first protective part 31 and the second protective part 32), and then the second fluid glue is injected to form the sealing part 9, and the first fluid glue and the second fluid glue are of different materials to meet different performance requirements; further, the sealing part 9 covers the protective part 3, and the process is relatively simple; or the protective part 3 includes the first protective part 31 and the second protective part 32, and the second protective part 32 is of an integral structure with the sealing part 9, and the sealing part 9 covers at least part of the first protective part 31, for example, the first protective part 31 is first sprayed to form the first protective part 31, and the fluid glue is solidified to form the second protective part 32 and the sealing part 9 at the same time; further, the sealing part 9 covers the first protective part 31, and the process is relatively simple.

[0033] Please refer to Figures 1 to 13The spacer 13 includes an extension portion 134 and a reinforcement portion 133. The extension portion 134 extends from the partition portion 135 toward the stator assembly and has a clearance fit with the pump shaft 7. The reinforcement portion 133 extends from the extension portion 134 away from the axis of the electric pump. Part of the sidewall of the reinforcement portion 133 serves as the groove wall of the receiving groove 1311. Injection molding of the spacer 13 can relatively reduce the amount of injection molding material, thereby helping to reduce production costs. Of course, in other embodiments, based on other requirements, the groove wall of the receiving groove 1311 can be spaced apart from the sidewall of the reinforcement portion 133. The cavity inlet channel 71 has an opening 73 on the side wall of the pump shaft 7, and the opening 73 is connected to the motor cavity 30. In the radial direction of the electric pump, the distance from the temperature sensing part 23 to the pump shaft 7 is less than the length of the reinforcement part 133. The cavity inlet channel 71 is connected to the second inlet channel 112. The heat generated by the stator assembly 5 has little effect on the temperature of the working medium entering the motor cavity 30 from the cavity inlet channel 71. The temperature sensing part 23 can be relatively close to the pump shaft 7, which is conducive to the temperature detection unit 2 to detect the temperature of the working medium in a timely manner.

[0034] Please refer to Figure 5 and Figure 6 The number of electrical connection parts 132 is 2, the fixing part 21 includes a first fixing part 21b and a second fixing part 21c, the first fixing part 21b is welded and fixed to one of the electrical connection parts 132, and the second fixing part 21c is welded and fixed to the other electrical connection part 132, the supporting part 22 includes a first supporting part 22b and a second supporting part 22c, the first supporting part 22b is connected to the first fixing part 21b, and the second supporting part 22c is connected to the second fixing part 21c, the first supporting part 22b is connected to the temperature sensing part 23, and the second supporting part 22c is connected to the temperature sensing part 23. For example, the first fixing part 21b serves as the positive pole of the temperature detection unit, and the second fixing part 21c serves as the negative pole of the temperature detection unit, thereby realizing the electrical connection of the temperature detection unit.

[0035] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person skilled in the art would be able to make various modifications and variations without departing from the spirit of the present application, and all such modifications and variations fall within the scope of protection of the present application.

Claims

1. An electric pump, characterized in that: The electric pump comprises a temperature detection unit (2), a circuit board (8) and an isolating member (13); the electric pump comprises an electrical connection portion (132); the isolating member (13) is fixed to the electrical connection portion (132) by injection molding; the electrical connection portion (132) is located at an end portion of the isolating member (13) relatively close to the circuit board (8) and is electrically connected to the circuit board (8); the electric pump comprises a motor cavity (30); the motor cavity (30) is connected to a cavity inlet channel (71) of the electric pump; the temperature detection unit (2) is located in the motor cavity (30); the temperature detection unit (2) comprises a pin portion (24); the electrical connection portion (132) is located at an end portion of the isolating member (13) relatively far from the circuit board (8) and is fixedly connected to the pin portion (24).

2. The electric pump according to claim 1, characterized in that The pin portion (24) includes a fixing portion (21), the electrical connection portion (132) is welded and fixed to a fixing sub-portion (21a) of the fixing portion (21), the electric pump includes a protective portion (3), the protective portion (3) includes a first protective portion (31), the first protective portion (31) is an isolation coating or an isolation glue, and the first protective portion (31) covers at least a portion of the fixing sub-portion (21a).

3. The electric pump according to claim 1, characterized in that The pin portion (24) includes a fixing portion (21) and a supporting portion (22), the supporting portion (22) includes a first portion (221), the first portion (221) is connected to the fixing portion (21), the isolating member (13) includes a receiving portion (131), the fixing portion (21) and the first portion (221) are located in a receiving groove (1311) of the receiving portion (131).

4. The electric pump according to claim 2, characterized in that The pin portion (24) includes a fixing portion (21) and a supporting portion (22), the supporting portion (22) includes a first portion (221), the first portion (221) is connected to the fixing portion (21), the isolating member (13) includes a receiving portion (131), the fixing portion (21) and the first portion (221) are located in a receiving groove (1311) of the receiving portion (131).

5. The electric pump according to claim 4, characterized in that The accommodating portion (131) includes a wire guide groove (1312), the wire guide groove (1312) is connected to the accommodating groove (1311), the supporting portion (22) includes a second portion (222), the second portion (222) is connected to the first portion (221), the second portion (222) is located in the wire guide groove (1312), and the protecting portion (3) includes a second protecting portion (32), the second protecting portion (32) covers at least a portion of the second portion (222).

6. The electric pump according to claim 5, characterized in that The second protection portion (32) is bonded and fixed to the groove wall of the lead groove (1312); or, the groove wall of the lead groove (1312) includes a bottom wall (1312b) and a side wall (1312a), the side wall (1312a) extends from the bottom wall (1312b) in a direction away from the circuit board (8), and at least one of the bottom wall (1312b) and the side wall (1312a) is bonded and fixed to the second portion (222).

7. The electric pump according to claim 5 or 6, characterized in that The temperature detection unit (2) includes a temperature sensing portion (23), the support portion (22) includes a third portion (223), the third portion (223) is located between the second portion (222) and the temperature sensing portion (23), and the length of the third portion (223) is less than the length of the first portion (221).

8. The electric pump according to claim 5 or 6, characterized in that The electrical connection portion (132) includes a welding portion (1321), the welding portion (1321) is located in the receiving groove (1311), and the welding portion (1321) is welded and fixed to the fixing portion (21). The electric pump includes a sealing portion (9), and the sealing portion (9) covers at least a portion of the welding portion (1321) and at least a portion of the bottom wall of the receiving groove (1311).

9. The electric pump according to claim 8, characterized in that The sealing portion (9) and the protective portion (3) are an integral structure; or, the sealing portion (9) and the protective portion (3) are separate structures, and the sealing portion (9) covers at least a portion of the protective portion (3); or, the protective portion (3) includes a first protective portion (31) and a second protective portion (32), and the second protective portion (32) and the sealing portion (9) are an integral structure, and the sealing portion (9) covers at least a portion of the first protective portion (31).

10. The electric pump according to claim 7, characterized in that The groove wall of the lead groove (1312) includes a bottom wall (1312b), the second part (222) contacts the bottom wall (1312b), and in the axial direction of the electric pump, the shortest distance from the bottom wall (1312b) to the bottom wall of the isolation member (13) is greater than the shortest distance from the temperature sensing part (23) to the bottom wall of the isolation member (13).

11. The electric pump according to claim 7 or 10, characterized in that: The electric pump includes a pump shaft (7), and the isolation member (13) includes an extension portion (134) and a reinforcement portion (133). The extension portion (134) is clearance-matched with the pump shaft (7), and the reinforcement portion (133) extends from the extension portion (134) toward an axis away from the electric pump. Part of the side wall of the reinforcement portion (133) is the groove wall of the accommodating groove (1311).

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