Electric pump

Abstract

The electric pump comprises an electric control assembly, the electric pump is provided with a first cavity, the electric pump is provided with a cavity inflow channel and a cavity outflow channel, the cavity inflow channel and the cavity outflow channel communicate with the first cavity, the electric control assembly comprises a temperature detection unit and a circuit board, and the temperature detection unit is electrically connected with the circuit board. In the projection of the cavity inflow channel on the first surface and the projection of the cavity outflow channel on the first surface, the projection relatively close to the central axis of the electric pump is a first projection, the projection relatively far away from the central axis of the electric pump is a second projection, and the maximum distance from the center of the first projection to the second projection is a first distance; the temperature detection unit is located in a circular area with the center of the first projection as the circle center and the first distance as the radius. Or the circuit board is provided with a diversion hole, the diversion hole penetrates through the first surface and the second surface, and a gap is formed between the temperature detection unit and the diversion hole. The device has the characteristic of accurately detecting the temperature of the working medium.

Description

[Technical field]

[0001] The present application relates to the field of vehicles, and in particular to components of a vehicle lubrication system and / or cooling system. [Background technology]

[0002] Electric pumps are used in vehicle lubrication systems and / or cooling systems and can meet market requirements very well. When the electric pump is working, the working medium will enter the electric pump. If the temperature of the working medium is high, the service life of some components in the lubrication system and / or cooling system may be shortened. Therefore, how to accurately detect the temperature of the working medium is a technical problem. [Summary of the invention]

[0003] The purpose of the present application is to provide an electric pump that is conducive to accurately detecting the temperature of a working medium.

[0004] To achieve the above purpose, one embodiment of the present application adopts the following technical solution:

[0005] An electric pump, the electric pump comprising an electric control component and a stator component, the stator component and the electric control component are electrically connected, the electric pump has a first cavity, the electric control component is located in the first cavity, the stator component is located in the first cavity, the electric pump has a cavity inlet flow channel and a cavity outlet flow channel, the cavity inlet flow channel is connected to the first cavity, the cavity outlet flow channel is connected to the first cavity, the electric control component comprises a temperature detection unit and a circuit board, the temperature detection unit is electrically connected to the circuit board, the circuit board has a first surface and a second surface, the stator component comprises an upper end portion, along the axial direction of the electric pump, the first surface is close to the upper end portion relative to the second surface; the projection of the cavity inlet flow channel on the first surface and the projection of the cavity outlet flow channel on the first surface are mutually opposite. The projection is close to the central axis of the electric pump, and the projection is relatively far from the central axis of the electric pump. The maximum distance from the center of the first projection to the second projection is the first distance; the temperature detection unit includes a main body, and along a direction parallel to the axial direction of the electric pump, the main body is close to the first surface relative to the second surface, and the temperature detection unit is located in a circular area with the center of the first projection as the center and the first distance as the radius; or the temperature detection unit includes a main body, and along a direction parallel to the axial direction of the electric pump, the main body is close to the second surface relative to the first surface, the circuit board has a guide hole, the guide hole passes through the first surface and the second surface, and there is a distance between the temperature detection unit and the guide hole.

[0006] In the above technical solution, the temperature detection unit is electrically connected to the circuit board, and the temperature detection unit is located in a circular area with the center of the first projection as the center and the first distance as the radius; or the circuit board has a guide hole, the guide hole passes through the first surface and the second surface, and there is a distance between the temperature detection unit and the guide hole. Since the temperature detection unit is within the flow path of the working medium, the temperature detection unit can detect the temperature of the working medium in time, which is conducive to accurately detecting the temperature of the working medium.

Brief Description of the Drawings

[0007] Figure 1 is a schematic diagram of an electric pump according to an embodiment of the present application;

[0008] Figure 2 yes Figure 1 A schematic diagram of a first shell;

[0009] Figure 3 yes Figure 2 A schematic cross-sectional view of the first shell shown;

[0010] Figure 4 yes Figure 1 Schematic diagram of the pump shaft;

[0011] Figure 5 yes Figure 1 A schematic diagram of the first-person view of the middle pump cover;

[0012] Figure 6 yes Figure 1 A schematic diagram of a second perspective of the middle pump cover;

[0013] Figure 7 yes Figure 1 Schematic diagram of the electronic control components;

[0014] Figure 8 yes Figure 1 A schematic cross-sectional view of the electronic control assembly shown;

[0015] Fig. 9 yes Figure 1 A schematic diagram of the projection of the middle cavity inlet flow channel and the cavity outlet flow channel on the first surface;

[0016] Fig.10 is a schematic diagram of an electric pump according to an embodiment of the present application;

[0017] Fig.11 yes Fig.10 A schematic diagram of a first shell;

[0018] Fig.12 yes Fig.11 A schematic cross-sectional view of the first shell shown;

[0019] Fig.13is a schematic diagram of the projection of the first rotor assembly in 10 on the cavity wall;

[0020] Fig.14 yes Fig.10 A schematic diagram of the middle stator assembly, the second rotor assembly and the pump shaft assembly;

[0021] Fig.15 yes Fig.10 Schematic diagram of the pump shaft;

[0022] Fig.16 yes Fig.15 A schematic cross-sectional view of a first embodiment of a pump shaft is shown;

[0023] Fig.17 yes Fig.15 A schematic cross-sectional view of a second embodiment of the pump shaft shown;

[0024] Fig.18 yes Fig.10 A schematic diagram of the first-person view of the middle pump cover;

[0025] Fig.19 yes Fig.10 A schematic diagram of a second perspective of the middle pump cover;

[0026] Fig. 20 yes Figure 1 or Fig.10 A schematic diagram of a first rotor assembly;

[0027] Fig.21 yes Fig.10 Schematic diagram of the electronic control components;

[0028] Fig. 22 yes Fig.10 A schematic cross-sectional view of the electronic control assembly shown;

[0029] Fig.23 yes Fig.10 A schematic diagram of a first embodiment of the projection of the middle cavity inlet flow channel and the cavity outlet flow channel on the first surface;

[0030] Fig.24 yes Fig.10 A schematic diagram of a second embodiment of the projection of the middle cavity inlet flow channel and the cavity outlet flow channel on the first surface;

[0031] Fig.25 yes Fig.24 a schematic diagram of the second side of the circuit board;

[0032] Fig.26 yes Fig.10 A schematic diagram of a third embodiment of the projection of the middle cavity inlet flow channel and the cavity outlet flow channel on the first surface;

[0033] Fig. 27 yes Fig.26 A schematic diagram of the second side of the circuit board is shown.

[0034] Reference numerals: 1, pump cover; 11, first inlet channel; 12, outlet channel; 13, second inlet channel; 14, branch channel; 141, first connecting portion; 142, second connecting portion; 2, first housing; 21, cavity wall; 3, second housing; 4, first rotor assembly; 41, first rotor; 42, second rotor; 43, hydraulic chamber; 431, first hydraulic chamber; 432, second hydraulic chamber; 5, stator assembly; 51, stator core; 52, winding; 53, upper end ; 6. Second rotor assembly; 7. Pump shaft; 71. First end portion; 72. First end face; 73. Second end face; 8. Electronic control assembly; 81. Circuit board; 811. First face; 812. Second face; 813. Flow guide hole; 82. Temperature detection unit; 821. Main body; 20. First cavity; 30. Second cavity; 40. Cavity inlet channel; 401. Main stream channel; 402. Branch channel; 50. Cavity outlet channel; 101', First projection; 102', Second projection. [Specific implementation method]

[0035] The present application is further described below with reference to the accompanying drawings and specific embodiments:

[0036] In order to enable those skilled in the art to better understand the technical solution 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 ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. The directional words such as upper and lower involved in this article are defined by the positions of the parts shown in the drawings relative to each other, just for the clarity and convenience of expressing the technical solution. It should be understood that the directional words used in this article should not limit the scope of protection requested by this application.

[0037] Please refer to Figures 1 to 27 The electric pump includes a pump housing, and the pump housing includes a pump cover 1, a first housing 2 and a second housing 3. The pump cover 1 is fixedly connected to the first housing 2, for example, the pump cover 1 and the first housing 2 are connected by screws or bolts. Of course, the pump cover 1 and the first housing 2 can also be connected by other connection methods, such as plug-in, card-connection, etc.; the first housing 2 is fixedly connected to the second housing 3, for example, the first housing 2 and the second housing 3 are connected by screws or bolts, which is conducive to making the disassembly and assembly of the electric pump more convenient.

[0038] The electric pump includes a first rotor assembly 4, a stator assembly 5, a second rotor assembly 6, a pump shaft 7 and an electronic control assembly 8. The stator assembly 5 is located on the outer periphery of the second rotor assembly 6. The stator assembly 5 surrounds the second rotor assembly 6 from the radial outer side of the second rotor assembly 6. The electric pump has a first cavity 20 and a second cavity 30. The first cavity 20 and the second cavity 30 are connected. The first rotor assembly 4 (or at least part of the first rotor assembly 4) is located in the second cavity 30. The electronic control assembly 8, 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 first cavity 20. The electronic 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 make the structure compact, thereby reducing the production cost of the electric pump.

[0039] The first rotor assembly 4 includes a first rotor 41 and a second rotor 42, the first rotor 41 includes a plurality of internal teeth, the second rotor 42 includes a plurality of external teeth, the electric pump has a hydraulic chamber 43, and the hydraulic chamber 43 is located between the first rotor 41 and the second rotor 42. The stator assembly 5 is electrically connected to the electronic control assembly 8, the stator assembly 5 includes a stator core 51 and a winding 52, when the electric pump is working, the electronic control assembly 8 controls the current in the winding 52 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 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 pump shaft 7 is transmission-connected to the second rotor assembly 6, specifically, one side of the pump shaft 7 is connected to the second rotor 42, and the other side of the pump shaft 7 is connected to the second rotor assembly 6, the second rotor assembly 6 drives the second rotor 42 to rotate through the pump shaft 7, thereby realizing the rotation of the first rotor assembly 4.

[0040] The first rotor 41 is located at the outer periphery of the second rotor 42, and the first rotor 41 and the second rotor 42 are internally meshed. In other embodiments, the first rotor 41 and the second rotor 42 may also be externally meshed, and in this case, 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, there is a certain eccentricity between the central axis of the first rotor 41 and 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 mesh 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.

[0041] The electric pump includes a first inlet channel 11 and an outlet channel 12. The first inlet channel 11 is used for the inflow of the working medium, and the outlet channel 12 is used for the outflow of the working medium. Specifically, the working medium can enter the hydraulic chamber 43 through the first inlet channel 11, and the working medium can leave the hydraulic chamber 43 through the outlet channel 12. During the process of the first rotor assembly 4 rotating one circle, the volume of the hydraulic chamber 43 between the inner teeth of at least one first rotor 41 and the outer teeth of the second rotor 42 corresponding to the inner teeth will change. Specifically, during the process of the first rotor assembly 4 rotating from the starting point to a certain angle, at least one first rotor 4 The volume of the hydraulic chamber 43 formed between the inner teeth of the first rotor 41 and the outer teeth of the second rotor 42 corresponding to the inner teeth will gradually increase to form a partial vacuum. At this time, the working medium is sucked into the hydraulic chamber 43 from the first inlet channel 11. During the continuous rotation of the first rotor 41 and the second rotor 42, the volume of the hydraulic chamber 43 formed between at least one inner tooth of the first rotor 41 and the outer teeth of the second rotor 42 corresponding to the inner teeth will gradually decrease, and the working medium will be squeezed, so that the working medium entering the hydraulic chamber 43 is pressed out to the outlet channel 12 to generate flow power. The flow path of the above-mentioned working medium is Figure 1 or Fig.10 The S1 path in .

[0042] The hydraulic chamber 43 includes a first hydraulic chamber 431 and a second hydraulic chamber 432. To more clearly distinguish the first hydraulic chamber 431 from the second hydraulic chamber 432, see Fig.13 The first hydraulic chamber 431 and the second hydraulic chamber 432 are distinguished by two different section lines. In this embodiment, please refer to Fig.10 , the first rotor assembly 4 rotates in the counterclockwise direction, where "counterclockwise" means that the electric pump without sectioning is rotated. Fig.10 When the first hydraulic chamber 431 is placed in the state, it is viewed from a top view. The first hydraulic chamber 431 includes a plurality of first hydraulic sub-chambers, and the second hydraulic chamber 432 includes a plurality of second hydraulic sub-chambers. Along the rotation direction of the first rotor assembly 4, the volume of the first hydraulic sub-chamber gradually increases to form a local vacuum, at which time the working medium is sucked into the first hydraulic sub-chamber. In the second hydraulic chamber 432, along the rotation direction of the first rotor assembly 4, the volume of the second hydraulic sub-chamber gradually decreases, and the working medium is squeezed, so that the working medium entering the second hydraulic sub-chamber is pressed out to generate flow power.

[0043] Please refer to Figure 1As shown in Figure 27, the electric pump has a cavity inlet flow channel 40 and a cavity outlet flow channel 50, the cavity inlet flow channel 40 is connected to the first cavity 20, and the cavity outlet flow channel 50 is connected to the first cavity 20. The electric control component 8 includes a circuit board 81 and a temperature detection unit 82, the temperature detection unit 82 is electrically connected to the circuit board 81, at least part of the temperature detection unit 82 is located on the circuit board 81, and the temperature detection unit 82 is directly integrated with the electric control component 8, so that the temperature detection unit 82 does not need to be mechanically connected to the external system separately, which is conducive to relatively reducing the mechanical connection of the system, and then to simplifying the system structure, making the system structure more compact; in addition, the working medium can enter the first cavity 20 from the cavity inlet flow channel 40, so that the working medium located in the first cavity 20 can exchange heat with the heat generated by the electric control component 8, which is conducive to the heat dissipation of the electric control component 8, and then to improve the service life of the electric pump; further, at least part of the stator component 5 can also contact with the working medium located in the first cavity 20, so that the working medium located in the first cavity 20 can exchange heat with the heat generated by the stator component 5, which is conducive to the heat dissipation of the stator component 5.

[0044] The circuit board 81 has a first surface 811 and a second surface 812, the stator assembly 5 includes an upper end portion 53, and along the axial direction of the electric pump, the first surface 811 is close to the upper end portion 53 relative to the second surface 812; the projection of the cavity inlet flow channel 40 on the first surface 811 and the projection of the cavity outlet flow channel 50 on the first surface 811, wherein the projection relatively close to the central axis of the electric pump is the first projection 101', and the projection relatively far from the central axis of the electric pump is the second projection 102'. In one embodiment, the temperature detection unit 82 includes a body portion 821, and along the direction parallel to the axial direction of the electric pump, the body portion 821 is close to the first surface 811 relative to the second surface 812, and the center O' of the first projection 101' is to the second projection 102'. The maximum distance is the first distance L1, and the temperature detection unit is located in a circular area Q with the center O' of the first projection 101' as the center and the first distance L1 as the radius; in one embodiment, the temperature detection unit 82 includes a main body 821, along the direction parallel to the axial direction of the electric pump, the main body 821 is close to the second surface 812 relative to the first surface 811, the circuit board 81 has a guide hole 813, the guide hole 813 runs through the first surface 811 and the second surface 812, and there is a distance between the temperature detection unit 82 and the guide hole 813. Since the temperature detection unit 82 is within the flow path range of the working medium, the temperature detection unit 82 can detect the temperature of the working medium in time, which is conducive to accurately detecting the temperature of the working medium. The temperature detection unit 82 includes a fixing portion (not shown), the fixing portion is electrically connected to the main body 821, and the fixing portion is electrically connected to the circuit board 81.

[0045] The pressure of the working medium at the inlet of the cavity inlet flow channel 40 is greater than the pressure of the working medium at the outlet of the cavity outlet flow channel 50, so that a pressure difference is formed between the inlet of the cavity inlet flow channel 40 and the outlet of the cavity outlet flow channel 50. According to the principle that the working medium flows from a high-pressure area to a low-pressure area, the working medium in the first cavity 20 can flow toward the outlet of the cavity outlet flow channel 50, that is, the working medium in the first cavity 20 can flow out of the first cavity 20 from the cavity outlet flow channel 50.

[0046] In one embodiment, please refer to Figures 1 to 9 The temperature detection unit 82 includes a body 821. Along the direction parallel to the axial direction of the electric pump, the body 821 is close to the first surface 811 relative to the second surface 812. The projection of the cavity outlet flow channel 50 on the first surface 811 is close to the central axis of the electric pump relative to the projection of the cavity inlet flow channel 40 on the first surface 811, that is, in the radial direction of the electric pump, the minimum distance from the central axis of the electric pump to the projection of the cavity outlet flow channel 50 on the first surface 811 is smaller than the minimum distance from the central axis of the electric pump to the projection of the cavity inlet flow channel 40 on the first surface 811; the projection of the cavity outlet flow channel 50 on the first surface 811 is the first projection 101', the projection of the cavity inlet flow channel 40 on the first surface 811 is the second projection 102', and the minimum distance from the temperature detection unit 82 to the second projection 102' is smaller than the minimum distance from the temperature detection unit 82 to the first projection 101'; further, at least part of the temperature detection unit 82 is located in the second projection 102', and at this time, the minimum distance from the temperature detection unit 82 to the second projection 102' is 0. The flow path of the working medium from the cavity inlet flow channel 40 to the temperature detection unit 82 or the flow path of the temperature detection unit 82 to the cavity outlet flow channel 50 can be a straight line, the flow resistance of the working medium is low, the flow rate of the working medium is fast, and the temperature detection unit 82 can detect the temperature of the working medium in time, which is conducive to accurately detecting the temperature of the working medium; in addition, the temperature detection unit 82 is relatively close to the cavity inlet flow channel 40, and can detect the temperature of the working medium quickly. The temperature detection unit 82 includes a fixing portion (not shown), the fixing portion is electrically connected to the body portion 821, and the fixing portion is electrically connected to the circuit board 81.

[0047] The electric pump includes a pump shaft 7, at least part of the pump shaft 7 is located in the first cavity 20, and the cavity outlet flow channel 50 passes through the first end face 72 and the second end face 73 of the pump shaft 7. The electric pump includes a pump cover 1, a first inlet flow channel 11 passes through the upper end face and the lower end face of the pump cover 1, and the first inlet flow channel 11 is connected to the second cavity 30. The electric pump includes a cavity wall 21. In the axial direction of the electric pump, the first cavity 20 is located on one side of the cavity wall 21, and the second cavity 30 is located on the other side of the cavity wall 21. The cavity inlet flow channel 40 passes through the upper end face and the lower end face of the cavity wall 21, and the cavity inlet flow channel 40 is connected to the second cavity 30. Specifically, the second hydraulic cavity 432 is connected to the cavity inlet flow channel 40, and the working medium entering the electric pump can flow from the first inlet flow channel 11 to the cavity inlet flow channel 40.

[0048] The pump cover includes a branch channel 14, which is recessed from the lower end surface of the pump cover 1. Along the axial direction of the pump cover 1, the branch channel 14 does not penetrate the upper end surface of the pump cover 1. Figure 1 In the fluid path shown in S2, the branch channel 14 is connected to the cavity outlet channel 50, and the branch channel 14 is connected to the first inlet channel 11, so that the working medium in the first cavity 20 can flow into the first inlet channel 11 through the cavity outlet channel 50 and the branch channel 14, and then be discharged from the outlet channel 12. This method of discharging the working medium in the first cavity 20 to the first inlet channel 11 is conducive to improving the inlet flow rate of the pump, and thus is conducive to improving the pump efficiency. In addition, since the stator assembly 5 (or the stator assembly 5 and the electronic control assembly 8) is located in the first cavity 20, the flowing working medium can take away at least part of the heat of the stator assembly 5 (or the stator assembly 5 and the electronic control assembly 8), which is conducive to improving the heat dissipation efficiency of the stator assembly 5 (or the stator assembly 5 and the electronic control assembly 8), thereby meeting the heat dissipation requirements of high-power electric pumps. The branch channel 14 includes a first connecting portion 141 and a second connecting portion 142. The first connecting portion 141 is directly connected to the cavity outlet channel 50. Along the radial direction of the pump cover 1, the second connecting portion 142 is arranged as a partial circumferential side wall of the first connecting portion 141, so that the first connecting portion 141 is connected to the first inlet channel 11.

[0049] In one embodiment, please refer to Figures 10 to 27, the projection of the cavity outlet flow channel 50 on the first surface 811 is far away from the central axis of the electric pump relative to the projection of the cavity inlet flow channel 40 on the first surface 811, that is, in the radial direction of the electric pump, the minimum distance from the central axis of the electric pump to the projection of the cavity inlet flow channel 40 on the first surface 811 is smaller than the minimum distance from the central axis of the electric pump to the projection of the cavity outlet flow channel 50 on the first surface 811, the projection of the cavity outlet flow channel 50 on the first surface 811 is the second projection 102', the projection of the cavity inlet flow channel 40 on the first surface 811 is the first projection 101', the minimum distance from the temperature detection unit 82 to the first projection 101' is smaller than the minimum distance from the temperature detection unit 82 to the second projection 102', and further, at least part of the temperature detection unit 82 is located in the first projection 101', that is, the minimum distance from the temperature detection unit 82 to the first projection 101' is 0. The flow path of the working medium from the cavity inlet flow channel 40 to the temperature detection unit 82 or the flow path from the temperature detection unit 82 to the cavity outlet flow channel 50 can be a straight line, the flow resistance of the working medium is low, the flow rate of the working medium is fast, and the temperature detection unit 82 can detect the temperature of the working medium in time, which is conducive to accurately detecting the temperature of the working medium; in addition, the temperature detection unit 82 is relatively close to the cavity inlet flow channel 40, and can detect the temperature of the working medium more quickly.

[0050] The electric pump includes a pump shaft 7, at least part of which is located in the first cavity 20, the pump shaft 7 includes a first end 71, the first end 71 has a first end face 72, in a direction parallel to the axial direction of the electric pump, the first end 71 is closer to the circuit board 81 than the second rotor assembly 6, the pump shaft 7 has a cavity inlet flow channel 40, the cavity inlet flow channel 40 has an opening on the second end face 73, the cavity inlet flow channel 40 includes a main flow channel 401 and a branch channel 402, the main flow channel 401 is connected to the branch channel 402, the branch channel 402 has at least one opening on the side wall of the first end 71, the working medium enters the first cavity 20 from the cavity inlet flow channel 40 of the pump shaft 7, and the working medium After flowing out of the cavity inlet flow channel 40, the working medium contacts the electronic control component 8 earlier than the stator assembly 5 and / or the second rotor assembly 6. At this time, the working medium has absorbed less heat (or has not absorbed heat yet). Through the measurement of the temperature detection unit 82, the temperature of the working medium in the second inlet flow channel 13 can be accurately obtained. According to the detected temperature of the working medium, the temperature of the working medium at the stator assembly 5 and the second rotor assembly 6 can be assisted in estimating the temperature of the working medium, so as to perform accurate torque distribution thereon. In addition, there is no need to set a sensor at the inlet of the cavity inlet flow channel 40, which is beneficial to reduce the communication channel for relaying information to the electronic control component 8, thereby helping to reduce costs.

[0051] In one embodiment, please refer to Fig.16 and Fig.17, the extension direction of the branch channel 402 has an angle with the central axis of the electric pump. If the cavity inlet channel 40 includes a plurality of branch channels 402, the extension direction of at least one branch channel 402 has an angle with the central axis of the electric pump. Fig.16 , the extension direction of the branch channel 402 is perpendicular to the central axis of the electric pump, and the flow direction of the working medium in the branch channel 402 is the extension direction of the branch channel 402. When the electric pump is working, the pump shaft 7 rotates, and the working medium flowing out of the branch channel 402 can have a large contact area with the parts (such as the stator assembly 5) in the first cavity 20, which is conducive to improving the heat dissipation effect of the working medium on the parts. In one embodiment, the extension direction of the branch channel 402 intersects with the extension direction of the first surface 811, and the extension direction of the first surface 811 is perpendicular to the central axis of the electric pump. The inclined branch channel 402 can make the working medium flow toward the circuit board 81, which is conducive to the fastest contact of the working medium with the circuit board 81. Furthermore, the extension direction of the branch channel 402 intersects with the extension direction of the temperature detection unit 82, and the extension direction of the temperature detection unit 82 is perpendicular to the central axis of the electric pump. It is conducive to the fastest contact of the working medium with the temperature detection unit 82.

[0052] The electric pump includes a second inlet channel 13, which passes through the upper end face and the lower end face of the pump cover 1, and the second inlet channel 13 is connected to the cavity inlet channel 40. The working medium directly enters the cavity inlet channel 40 from the second inlet channel 13, and the working medium flowing out of the cavity inlet channel 40 does not absorb heat. At this time, the temperature of the working medium in the cavity inlet channel 40 can represent the temperature of the working medium in the gearbox. By measuring the temperature of the working medium flowing out of the cavity inlet channel 40, the temperature of the working medium in the gearbox can be estimated, which is conducive to comprehensive thermal management of the electric drive system. In addition, there is no need to set up an additional temperature detection unit in the gearbox, which is conducive to reducing costs. The electric pump includes a cavity wall 21. In the axial direction of the electric pump, the first cavity 20 is located on one side of the cavity wall 21, and the second cavity 30 is located on the other side of the cavity wall 21. The cavity outlet channel 50 passes through the upper end face and the lower end face of the cavity wall 21, and the cavity outlet channel 50 is connected to the first cavity 20. Specifically, the cavity outlet channel 50 is connected to the first hydraulic cavity 431.

[0053] Please refer to Figures 1 to 27, there is a spacing between the guide hole 813 and the first projection 101' and / or the second projection 102', the minimum distance L2 from the temperature detection unit 82 to the guide hole 813 is less than or equal to the minimum distance L3 from the first projection 101' to the guide hole 813; or the minimum distance L2 from the temperature detection unit 82 to the guide hole 813 is less than or equal to the minimum distance from the second projection 102' to the guide hole 813. The guide hole 813 improves the circulation of the working medium of the second surface 812, and the circulation of the working medium near the guide hole 813 is faster. The temperature detection unit 82 is relatively close to the guide hole 813, which is conducive to improving the detection accuracy; in addition, since the guide hole 813 improves the circulation of the working medium of the second surface 812, it is conducive to heat dissipation of the electronic control component 8.

[0054] In other embodiments, the circuit board 81 has multiple guide holes 813, and the minimum distance L2 from the temperature detection unit 82 to the guide hole 813 is less than or equal to the minimum distance L3 from the first projection 101' to the guide hole 813. The "minimum distance" here refers to the minimum distance from the guide hole 813 closest to the first projection 101' to the first projection 101'. For example, the circuit board 81 has a first guide hole and a second guide hole, and the minimum distance from the first guide hole to the first projection 101' (denoted as D1) is greater than the minimum distance from the second guide hole to the first projection 101' (denoted as D2), then D2 is the above-mentioned L3, and the distance L2 from the temperature detection unit 82 to the guide hole 813 is less than or equal to D2.

[0055] In other embodiments, the circuit board 81 has multiple guide holes 813, and the distance from the temperature detection unit 82 to the guide hole 813 is less than or equal to the minimum distance from the second projection 102' to the guide hole 813. The "minimum distance" here refers to the minimum distance from the guide hole closest to the second projection 102' to the second projection 102'. For example, the circuit board 81 has a third guide hole and a fourth guide hole, and the minimum distance from the third guide hole to the second projection 102' (denoted as D3) is greater than the minimum distance from the fourth guide hole to the second projection 102' (denoted as D4), then the distance from the temperature detection unit 82 to the guide hole 813 is less than or equal to D4.

[0056] Please refer to Figure 26 to Figure 27 , the guide hole 813 is located in the first projection 101' or the second projection 102', and the minimum distance L2 from the temperature detection unit 82 to the guide hole 813 is less than the maximum distance L4 from the first projection 101' to the second projection 102'. In the axial direction parallel to the electric pump, the guide hole 813 is arranged opposite to the cavity inlet channel 40 or the cavity outlet channel 50, the circulation flow of the working medium at the guide hole 813 is faster, and the temperature detection unit 82 is relatively close to the guide hole 813, which is conducive to improving the detection accuracy.

[0057] It should be noted that the above embodiments are only used to illustrate the present application and are not intended to limit the technical solutions described in the present application. Although the present application has been described in detail in this specification with reference to the above embodiments, a person of ordinary skill in the art should understand that a person of ordinary skill in the art can still modify or make equivalent substitutions to the present application, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present application should be included in the scope of the claims of the present application.

Claims

1. An electric pump, characterized in that: The electric pump comprises an electric control component (8) and a stator component (5), wherein the stator component (5) and the electric control component (8) are electrically connected, the electric pump has a first cavity (20), the electric control component (8) is located in the first cavity (20), the stator component (5) is located in the first cavity (20), the electric pump has a cavity inlet flow channel (40) and a cavity outlet flow channel (50), the cavity inlet flow channel (40) is connected to the first cavity (20), and the cavity outlet flow channel (50) is connected to the first cavity (20), the electric control component (8) comprises a circuit board (81) and a temperature detection unit (82), the temperature detection unit (82) and the circuit board (81) are electrically connected, the circuit board (81) has a first surface (811) and a second surface (812), the stator component (5) comprises an upper end portion (53), along the axial direction of the electric pump, the first surface (811) is 11) close to the upper end portion (53) relative to the second surface (812); among the projections of the cavity inlet flow channel (40) on the first surface (811) and the projections of the cavity outlet flow channel (50) on the first surface (811), the one relatively close to the central axis of the electric pump is the first projection (101'), and the one relatively far away from the central axis of the electric pump is the second projection (102'); the temperature detection unit (82) includes a body portion (821), along a direction parallel to the axial direction of the electric pump, the body portion (821) is close to the first surface (811) relative to the second surface (812), the maximum distance from the center of the first projection (101') to the second projection (102') is the first distance, and the temperature detection unit (82) is located in a circular area with the center of the first projection (101') as the center and the first distance as the radius; Alternatively, the temperature detection unit (82) includes a main body (821), and along a direction parallel to the axial direction of the electric pump, the main body (821) is close to the second surface (812) relative to the first surface (811), the circuit board (81) has a guide hole (813), and the guide hole (813) passes through the first surface (811) and the second surface (812), and there is a distance between the temperature detection unit (82) and the guide hole (813).

2. The electric pump according to claim 1, characterized in that: The temperature detection unit (82) includes a main body (821), and along a direction parallel to the axial direction of the electric pump, the main body (821) is close to the first surface (811) relative to the second surface (812), the circuit board (81) has a guide hole (813), and the guide hole (813) passes through the first surface (811) and the second surface (812), and there is a distance between the temperature detection unit (82) and the guide hole (813).

3. The electric pump according to claim 1 or 2, characterized in that: The temperature detection unit (82) comprises a main body (821). Along a direction parallel to the axial direction of the electric pump, the main body (821) is close to the first surface (811) relative to the second surface (812); the projection of the cavity outlet flow channel (50) on the first surface (811) is close to the central axis of the electric pump relative to the projection of the cavity inlet flow channel (40) on the first surface (811); the projection of the cavity outlet flow channel (50) on the first surface (811) is the first projection (101'), and the projection of the cavity inlet flow channel (40) on the first surface (811) is the second projection (102'); the minimum distance from the temperature detection unit (82) to the second projection (102') is smaller than the minimum distance from the temperature detection unit (82) to the first projection (101').

4. The electric pump according to claim 1 or 3, characterized in that: The electric pump comprises a first rotor assembly (4), the electric pump having a second cavity (30), the first rotor assembly (4) being located in the second cavity (30), the electric pump comprising a cavity wall (21), in the axial direction of the electric pump, the first cavity (20) being located on one side of the cavity wall (21), the second cavity (30) being located on the other side of the cavity wall (21), the cavity inlet flow channel (40) penetrating the upper end surface and the lower end surface of the cavity wall (21), the first rotor assembly (4) comprising a first rotor (41) and a second rotor (42), the first rotor (41) being located on the outer periphery of the second rotor (42), the electric pump having a hydraulic cavity (43), the hydraulic cavity (43) being located between the first rotor (41) and the second rotor (42), the hydraulic cavity (43) comprising a second hydraulic cavity (432), the cavity inlet flow channel (40) being connected to the second hydraulic cavity (432).

5. The electric pump according to claim 4, characterized in that: The electric pump comprises a pump shaft (7), the pump shaft (7) being drivingly connected to the first rotor assembly (4), and the cavity outflow channel (50) passing through a first end surface (72) and a second end surface (73) of the pump shaft (7).

6. The electric pump according to claim 1 or 2, characterized in that: The temperature detection unit (82) comprises a main body (821), and along a direction parallel to the axial direction of the electric pump, the main body (821) is close to the first surface (811) relative to the second surface (812), the projection of the cavity outlet flow channel (50) on the first surface (811) is away from the central axis of the electric pump relative to the projection of the cavity inlet flow channel (40) on the first surface (811), the projection of the cavity outlet flow channel (50) on the first surface (811) is the second projection (102'), the projection of the cavity inlet flow channel (40) on the first surface (811) is the first projection (101'), and the minimum distance from the temperature detection unit (82) to the first projection (101') is smaller than the minimum distance from the temperature detection unit (82) to the second projection (102').

7. The electric pump according to claim 1 or 6, characterized in that: The electric pump comprises a first rotor assembly (4), the electric pump having a second cavity (30), the first rotor assembly (4) being located in the second cavity (30), the electric pump comprising a cavity wall (21), in the axial direction of the electric pump, the first cavity (20) being located on one side of the cavity wall (21), the second cavity (30) being located on the other side of the cavity wall (21), the cavity outlet passage (50) penetrating the upper end surface and the lower end surface of the cavity wall (21), the first rotor assembly (4) comprising a first rotor (41) and a second rotor (42), the first rotor (41) being located on the outer periphery of the second rotor (42), the electric pump having a hydraulic cavity (43), the hydraulic cavity (43) being located between the first rotor (41) and the second rotor (42), the hydraulic cavity (43) comprising a first hydraulic cavity (431), the cavity outlet passage (50) being connected to the first hydraulic cavity (431).

8. The electric pump according to claim 7, characterized in that The electric pump comprises a second rotor assembly (6) and a pump shaft (7), wherein the pump shaft (7) is transmission-connected to the first rotor assembly (4), and the pump shaft (7) is transmission-connected to the second rotor assembly (6), wherein the pump shaft (7) comprises a first end portion (71), and in the axial direction of the electric pump, the first end portion (71) is closer to the circuit board (81) than the second rotor assembly (6), and the pump shaft (7) has the cavity inlet flow channel (40), and the cavity inlet flow channel (40) comprises a branch channel (402), and the branch channel (402) has an opening on a side wall of the first end portion (71).

9. The electric pump according to claim 8, characterized in that There is an angle between the extension direction of the branch channel (402) and the central axis of the electric pump; or the extension direction of the branch channel (402) intersects with the extension direction of the first surface (811), and the central axis of the electric pump is perpendicular to the extension direction of the first surface (811).

10. The electric pump according to claim 1 or 2, characterized in that: There is a distance between the guide hole (813) and the first projection (101') and / or the second projection (102'), and the minimum distance from the temperature detection unit (82) to the guide hole (813) is less than or equal to the minimum distance from the first projection (101') to the guide hole (813); Alternatively, the minimum distance from the temperature detection unit (82) to the guide hole (813) is less than or equal to the minimum distance from the second projection (102') to the guide hole (813).

11. The electric pump according to claim 1 or 2, characterized in that: The guide hole (813) is located within the first projection (101') or the second projection (102'), and the minimum distance from the temperature detection unit (82) to the guide hole (813) is smaller than the maximum distance from the first projection (101') to the second projection (102').

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