Electric pump

Abstract

An electric pump is disclosed. The electric pump includes a first cavity. When the electric pump operates, there is an operating medium in the first cavity. The electric pump includes a control unit and a rotating unit. The control unit is located in the first cavity, and at least a part of the rotating unit is located in the first cavity. The control unit includes a circuit board, a magnetic element, and a sensor. The circuit board is electrically connected and / or signal-connected to the sensor. An end of the rotating unit that is relatively close to the circuit board is fixedly connected to the magnetic element or connected in a position-limited manner. The circuit board includes a first surface facing the magnetic element, and at least a part of the sensor is located on the first surface. The magnetic element is located within the detection range of the sensor, and at least a part of the projection of the magnetic element on the first surface overlaps the sensor, or the sensor is located within the projection range of the magnetic element on the first surface. This application can detect the rotation status of the electric pump well.

Description

Technical Field

[0001] This application was filed with the China National Intellectual Property Administration on July 29, 2022, with application number 202210910293.1 and invention title "Electric Pump", and also claims the priority of two Chinese patent applications, namely, the application filed with the China National Intellectual Property Administration on July 29, 2022, with application number 202210912059.2 and invention title "Electric Pump", and all of its content is incorporated herein by reference.

[0002] This application relates to the field of vehicles, and particularly to components of a vehicle lubrication system and / or a cooling system.

Background Art

[0003] An electric pump mainly provides a power source for a vehicle lubrication system. When the electric pump operates, the circuit board is immersed in the operating medium. In this case, how to monitor the rotation status of the electric pump is a technical problem.

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of this application is to provide an electric pump that can effectively monitor the rotation status of the electric pump.

Means for Solving the Problems

[0005] To achieve the above object, one embodiment of this application adopts the following technical solution: An electric pump, wherein the electric pump is provided with a first cavity. When the electric pump operates, there is an operating medium in the first cavity. The electric pump includes a control unit and a rotating unit. The control unit is located in the first cavity, and at least a part of the rotating unit is located in the first cavity. The control unit includes a circuit board, a magnetic element, and a sensor. The circuit board is electrically connected and / or signal-connected to the sensor. An end of the rotating unit that is relatively close to the circuit board is fixedly connected to the magnetic element, or is connected in a position-limited manner. The circuit board includes a first surface facing the magnetic element. At least a part of the sensor is located on the first surface. The magnetic element is located within the detection range of the sensor. At least a part of the projection of the magnetic element on the first surface overlaps the sensor, or the sensor is located within the projection range of the magnetic element on the first surface.

[0006] In the above technical solution, the sensor is electrically connected and / or signal-connected to the circuit board. A magnetic element is fixedly connected to an end of the rotating unit that is relatively close to the circuit board, or is connected in a position-limited manner. The magnetic element is located within the detection range of the sensor. At least a part of the projection of the magnetic element on the first surface overlaps the sensor, or the sensor is located within the projection range of the magnetic element on the first surface. In this way, by the cooperation of the sensor and the magnetic element, the rotation of the electric pump can be monitored.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2A

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Embodiments for Carrying Out the Invention

[0008] Hereinafter, the present application will be further described in combination with the drawings and specific examples.

[0009] In order for those skilled in the art to better understand the technical solution of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments. The drawings described below are only some embodiments of the present application. On the premise that those skilled in the art do not perform labor worthy of inventive step, other drawings can be obtained based on these drawings. The orientation terms such as up and down in this specification are defined based on the positions between the components in the drawings, and are only for clearly and conveniently expressing the technical solution. The orientation terms used in this specification do not limit the scope claimed by the present application.

[0010] Referring to FIGS. 1, 2A-2D, 3, 4, 5A-5B, 6A-6B, 7A-7B, 8A-8B, 9A-9C and 10-20, the present application provides an electric pump. The electric pump is mounted on, for example, a driving device of a vehicle. The electric pump includes a pump casing 1, and a pump unit 2, a motor unit 3 and a control unit 4 are provided in the pump casing 1. The motor unit 3 receives power supply and generates a rotational driving force. The control unit 4 detects the rotation of the motor unit 3. The pump unit 2 is driven by the motor unit 3 to suck an operating medium, and the operating medium is, for example, a liquid such as oil.

[0011] Referring to FIGS. 1 and 10, the pump casing 1 includes a pump cover 11, a first housing 12 and a second housing 13. The pump cover 11 is fixedly connected to the first housing 12. The first housing 12 is fixedly connected to the second housing 13. The materials of the pump cover 11, the first housing 12 and the second housing 13 are all metal materials. Of course, the material of the first housing 12 or the second housing 13 can be a metal material. For example, the material of the pump cover 11 or the second housing 13 can be plastic, and the material of the first housing 12 can be metal. Further, the materials of the pump cover 11 and the second housing 13 can be plastic, and the material of the first housing 12 can be metal. Specifically, in this embodiment, the pump cover 11 and the first housing 12 are connected by screws or bolts. When screws or bolts are inserted from the inside of the pump towards the pump cover 11, since the screws or bolts are less likely to corrode due to the external environment, the connection strength between the pump cover 11 and the first housing 12 can be improved. When screws or bolts are inserted from the pump cover 11 into the inside of the pump, the detachment of the electric pump becomes more convenient, facilitating the maintenance of the pump unit 2 of the electric pump. Of course, the pump cover 11 and the first housing 12 can also be connected by other connection methods, such as insertion, locking, etc. The first housing 12 and the second housing 13 are fixedly connected. Specifically, the first housing 12 and the second housing 13 are connected by screws or bolts. By arranging them in this way, the detachment of the electric pump becomes more convenient. In this embodiment, since the control unit 4 is located in the cavity between the first housing 12 and the second housing 13, while facilitating the maintenance of the control unit 4 in the electric pump, the connection between the first housing 12 and the second housing 13 is more reliable. Of course, the first housing 12 and the second housing 13 can also use other connection methods, such as insertion, locking or adhesion. Referring to FIGS. 2A, 3-4, 10 and 18-19, for the connection relationship between the pump cover (not shown), the first housing (not shown) and the second housing (not shown), reference can be made to the above, and details are not repeated here.

[0012] Referring to FIGS. 1, 2A to 2D, 3, 4, 5A to 5B, 6A to 6B, 7A to 7B, 8A to 8B, 9A to 9C, and 10 to 20, the pump unit 2 includes a first rotor unit 21. The first rotor unit 21 includes a first rotor 211 and a second rotor 212. The first rotor 211 includes a plurality of internal teeth, and the second rotor 212 includes a plurality of external teeth. A hydraulic chamber 10 is formed between the internal teeth of the first rotor 211 and the external teeth of the second rotor 212. In this embodiment, the rotational speed of the pump unit 2 is the same as that of the motor unit 3. In other embodiments, the rotational speed of the pump unit 2 is different from that of the motor unit 3. For example, a speed reduction mechanism is provided between the pump unit 2 and the motor unit 3. The motor unit 3 includes a second rotor unit 31 and a stator unit 32. The stator unit 32 surrounds the second rotor unit 31 from the outside in the radial direction of the second rotor unit 31.

[0013] The electric pump further includes a rotating unit. The rotating unit is connected to the second rotor unit 31 and the first rotor unit 21 so as to transmit power, and includes a rotating shaft 6 capable of rotating the first rotor 211. In this embodiment, one side of the rotating shaft 6 is connected to the second rotor 212, and the other side is connected to the second rotor unit 31. The second rotor unit 31 rotates the first rotor 211 by the rotating shaft 6 to realize the rotation of the first rotor unit 21.

[0014] Referring to FIGS. 1, 2A to 2D, 3, 4 and 10 to 20, the pump casing 1 can form a pump cavity, the pump unit 2, the motor unit 3 and the control unit 4 are located in the pump cavity, the pump cavity includes a first cavity 20 and a second cavity 30, the second rotor unit 31 (or a part of the second rotor unit 31), the control unit 4, and a part of the rotating unit are located in the first cavity 20, the first rotor unit 21 is located in the second cavity 30, the stator unit 32 is electrically connected and / or signal-connected to the circuit board 41, the stator unit 32 (or at least a part of the stator unit 32) is located in the first cavity 20, the control unit 4 and the stator unit 32 are located in the same cavity, thereby reducing the axial size of the electric pump, making the structure compact, and reducing the manufacturing cost of the electric pump.The rotating shaft 6 is located inside the stator unit 32. The stator unit 32 includes a stator core 32a, an insulating bracket 32b, and a winding 32c. The insulating bracket 32b wraps at least a part of the surface of the stator core 32a, and the winding 32c is wound around the insulating bracket 32b. When the electric pump operates, the control unit 4 controls the current in the winding 32c of the stator unit 32 to change according to a predetermined law, so as to control the stator unit 32 to generate a changing excitation magnetic field. Under the action of the excitation magnetic field, the second rotor unit 31 rotates, so that the first rotor unit 21 can be directly or indirectly rotated. When the first rotor unit 21 rotates, there is a certain eccentric distance between the first rotor 211 and the second rotor 212. When the second rotor 212 rotates, some outer teeth of the second rotor 212 mesh with some inner teeth of the first rotor 211, thereby rotating the first rotor 211. During the process of the first rotor 211 and the second rotor 212 rotating one full circle, the volume in the hydraulic chamber 10 changes. Specifically, when the first rotor unit 21 rotates from the starting point to a certain angle, the volume in the hydraulic chamber 10 gradually increases, forming a local vacuum, and the working medium is sucked from the inlet 5 of the electric pump into the hydraulic chamber 10. When the first rotor 211 and the second rotor 212 continue to rotate, the volume of the hydraulic chamber 10 filled with the working medium gradually decreases, and the working medium is pressed. The working medium that enters the hydraulic chamber 10 is pushed out to the outlet 7 of the electric pump to generate power for flow.

[0015] Referring to FIGS. 2A-2D, FIGS. 3-4, and FIGS. 18-19, the first cavity 20 communicates with the second cavity 30. The electric pump includes a bottom wall 301. The first cavity 20 is located on one side of the bottom wall 301, and the second cavity 30 is located on the other side of the bottom wall 301. The bottom wall 301 supports the first rotor unit 21. The electric pump includes a second passage 50. The second passage 50 penetrates the upper and lower surfaces of the bottom wall 301 and communicates the first cavity 20 with the second cavity 30. Specifically, the second passage 50 communicates the first cavity 20 and the second cavity 30. At least a part of the working medium in the second cavity 30 flows into the first cavity 20 through the second passage 50 and contacts at least a part of the control unit 4 in the first cavity 20. Thereby, the working medium in the first cavity 20 can perform heat exchange with the heat generated from the control unit 4, contribute to the heat dissipation of the control unit 4, further extend the service life of the electric pump, and furthermore, at least a part of the stator unit 32 also contacts the working medium in the first cavity 20. Thereby, the working medium in the first cavity 20 can perform heat exchange with the heat generated from the stator unit 32 and contribute to the heat dissipation of the stator unit 32.

[0016] Referring to FIGS. 2A - 2D and 3, the electric pump further includes a first passage 40 communicating with the first cavity 20. The rotating unit includes a first end 61 closer to the circuit board 41 than the second rotor unit 31. The first passage 40 has a first opening 401 in the side wall of the first end 61. The rotating unit includes a second end 62 farther from the circuit board 41 than the first end 61 along the axial direction of the electric pump. The first passage 40 has a second opening 402 in the side wall of the second end 62. A part of the working medium in the first cavity 20 leaves the first cavity 20 through the first passage 40. The second opening 402 of the first passage 40 is closer to the inlet 5 of the electric pump than the first opening 401 of the first passage 40 along the axial direction of the electric pump. The pressure of the working medium at the inlet of the second passage 50 is greater than the pressure of the working medium at the second opening 402 of the first passage 40. Thus, a pressure difference is formed between the inlet of the second passage 50 and the second opening 402 of the first passage 40 for the working medium. Based on 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 flows in the direction of the second opening 402 of the first passage 40. That is, the working medium in the first cavity 20 can leave the first cavity 20 through the first passage 40. Since the stator unit 32 and the control unit 4 are located in the first cavity 20, the working medium takes away some heat of the stator unit 32 and the control unit 4, further improving the heat dissipation efficiency of the stator unit 32 and the control unit 4.

[0017] FIG. 3 shows the flow direction of the working medium. Referring to FIGS. 3 and 20, the electric pump includes an inlet 5 communicating with the second cavity 30. The working medium has two flow directions. In the first flow direction S1 of the working medium (refer to the thick dashed line), the working medium flows from the inlet 5 into the hydraulic chamber 10 of the first rotor unit 21 and then flows out of the hydraulic chamber 10 through the nozzle 7. In the second flow direction S2 of the working medium (refer to the thick solid line), a part of the working medium that enters the hydraulic chamber 10 of the first rotor unit 21 flows into the first cavity 20 through the second passage 50, and then the working medium in the first cavity 20 flows into the first passage 40 through the first opening 401.

[0018] Referring to FIGS. 2A-2B, 3, 5A-5B, 6A-6B, 7A-7B, 8A-8B and 9A-9C, the first passage 40 includes a second opening 402 and at least one first opening 401. Further, as shown in FIGS. 8A-8B, the number of the first openings 401 is at least two, and the first openings 401 are arranged along the radial direction of the rotation axis 6 or the axial direction of the rotation axis 6. There is a pitch between adjacent first openings 401. The first passage 40 is provided with a plurality of first openings 401, thereby increasing the flow rate of the working medium flowing from the first cavity 20 into the first passage 40 per unit time, and further improving the heat dissipation effect of the control unit 4. Referring to FIGS. 2A, 2C and 2D, the magnetic element 33 is fixedly connected to or connected so as to be position-limited to the first end 61. Specifically, the first end 61 includes a first end face 611, and the magnetic element 33 is fixedly connected to or connected so as to be position-limited to the first end face 611. The magnetic element 33 includes a second through hole 333, and the second through hole 333 communicates with the first passage 40 and also communicates with the first cavity 20.

[0019] Referring to FIGS. 5A-5B, combining with FIG. 3 or FIG. 4, the first end 61 is located on the rotation axis 6 and includes a first end face 611 and a first side face 612. Some of the first openings 401 are located on the first end face 611, and some of the other first openings 401 are located on the first side face 612. The magnetic element 33 is fixedly connected to or connected so as to be position-limited to the first end face 611, and the first openings 401 communicate with the first cavity 20. By arranging in this way, the rotating unit is connected to the second rotor unit 31 so as to transmit. The magnetic element 33 is fixedly connected to or connected so as to be position-limited to the first end face 611 of the rotating unit. The first end 61 is relatively close to the circuit board (or sensor). By the cooperation of the magnetic element 33 and the sensor, the rotation of the second rotor unit 31 can be monitored. On the other hand, the working medium in the first cavity 20 flows out of the first cavity 20 through the first openings 401. Since the stator unit 32 and the control unit 4 are located in the first cavity 20, the working medium takes away part of the heat of the stator unit 32 and the control unit 4 through the first openings 401.

[0020] Referring to FIGS. 7A to 7B and combining with FIG. 3 or FIG. 4, the rotating shaft 6 includes a first side surface 612, the first passage 40 has a first opening 401 on the first side surface 612, and the first cavity 20 communicates with the first opening 401. The working medium flows into the first passage 40 through the first opening 401, flows out and away from the first passage 40 through the second opening 402. A part of the working medium that has exchanged heat with the control unit 4 flows out through the first passage 40, and the working medium maintains a certain fluidity, thereby ensuring the heat dissipation effect of the working medium on the control unit 4. Referring to FIGS. 8A to 8B and combining with FIG. 3 or FIG. 4, the rotating shaft 6 includes a first side surface 612, the first passage 40 has at least two first openings 401 on the first side surface 612, and the first openings 401 are arranged along the radial direction of the rotating shaft 6 and / or the axial direction of the rotating shaft 6. The first cavity 20 communicates with the first opening 401. The working medium flows into the first passage 40 through the first opening 401, flows out and away from the first passage 40 through the second opening 402. A part of the working medium that has exchanged heat with the control unit 4 flows out through the first passage 40, and the working medium maintains a certain fluidity, thereby ensuring the heat dissipation effect of the working medium on the control unit 4.

[0021] Referring to FIG. 4, FIG. 4 is a schematic diagram of another embodiment of the electric pump of the present application. The difference from the embodiment of FIG. 3 is at least that the flow direction of the working medium is different. Referring to FIGS. 4 and 20, the first cavity 20 and the second cavity 30 communicate with each other. In this embodiment, the first cavity 20 and the second cavity 30 communicate with each other through the second passage 50. A part of the working medium in the first cavity 20 flows into the second cavity 30 through the second passage 50. The working medium in the first cavity 20 contacts at least a part of the control unit 4 in the first cavity 20. Thus, the working medium in the first cavity 20 can exchange heat with the heat generated from the control unit 4, contribute to the heat dissipation of the control unit 4, extend the service life of the electric pump. Furthermore, at least a part of the stator unit 32 also contacts the working medium in the first cavity 20. Thus, the working medium in the first cavity 20 can exchange heat with the heat generated from the stator unit 32 and contribute to the heat dissipation of the stator unit 32.

[0022] The electric pump further includes a first passage 40. The rotating unit includes a first end (not shown) that is closer to a circuit board (not shown) than the second rotor unit 31. The first passage 40 has a first opening 401 in the side wall of the first end (not shown). The rotating unit includes a second end 62 that is farther from the circuit board than the first end 61 along the axial direction of the electric pump. The first passage 40 has a second opening 402 at the second end (not shown) (for example, the end face of the second end). The working medium enters the first cavity 20 from the inlet 5 through the first passage 40. Along the axial direction of the electric pump, the second opening 402 of the first passage 40 is closer to the inlet 5 of the electric pump than the first opening 401 of the first passage 40. The pressure of the working medium at the second opening 402 of the first passage 40 is greater than the pressure of the working medium at the outlet of the second passage 50. Thus, the working medium forms a pressure difference between the second opening 402 of the first passage 40 and the outlet of the second passage 50. Based on the principle that the working medium flows from a high-pressure location to a low-pressure location, the working medium in the first cavity 20 flows in the direction of the outlet of the second passage 50. Since the stator unit 32 and the control unit 4 are located in the first cavity 20, the working medium takes away part of the heat of the stator unit 32 and the control unit 4, further improving the heat dissipation efficiency of the stator unit 32 and the control unit 4.

[0023] Figure 4 shows the flow direction of the working medium. Referring to FIGS. 3 and 20, the electric pump includes an inlet 5 that communicates with the second opening 402. The working medium has two flow directions. In the first flow direction S1 of the working medium (refer to the thick dashed line), part of the working medium flowing in from the inlet 5 enters the hydraulic chamber 10 of the first rotor unit 21, and then the working medium flows out of the hydraulic chamber 10 through the ejection port 7. In the second flow direction S2 of the working medium (refer to the thick solid line), part of the working medium flowing in from the inlet 5 enters the first cavity 20 through the first passage 40. Part of the working medium in the first cavity 20 flows into the second cavity 30 through the second passage 50, and then part of the working medium in the second cavity 30 flows out from the ejection port 7.

[0024] Referring to FIGS. 2A-2D, FIGS. 3-4, FIGS. 5A-5B, FIGS. 6A-6B, FIGS. 7A-7B and FIGS. 8A-8B, the control unit 4 includes a circuit board 41, a magnetic element 33 and a sensor 42. The sensor 42 is electrically connected and / or signal-connected to the circuit board 41 to detect the magnetic field of the magnetic element 33. The magnetic element 33 includes an upper magnetic surface 331 and a lower magnetic surface 332 that face each other. Along the axial direction of the electric pump, the upper magnetic surface 331 is away from the lower magnetic surface 332 from the circuit board 41. The first end 61 includes a first end face 611. The magnetic element 33 is fixed to the first end face 611. Along the axial direction of the electric pump, the lower magnetic surface 332 of the magnetic element 33 is closer to the circuit board 41 than the first end face 611. The magnetic element 33 is close to the sensor 42, and the detection accuracy of the sensor 42 is high.

[0025] Referring to FIGS. 9A-9C, FIGS. 9A-9C are schematic diagrams of the rotating shaft 6 and the second rotor unit 31 of an embodiment of the present application. Referring to FIGS. 3, 9A-9C, the rotating unit includes a connecting portion 8. The connecting portion 8 includes a receiving hole 81. At least a part of the rotating shaft 6 is located in the receiving hole 81. The side wall forming the receiving hole 81 is fixed and connected to the outer wall of at least a part of the rotating shaft 6, or is connected so as to be position-limited. The connecting portion 8 includes a first through hole 82 communicating with the first opening 401 of the first passage 40. The magnetic element 33 is fixed and connected to the outer wall of the connecting portion 8, or is connected so as to be position-limited. The first cavity 20 and the first passage 40 communicate with each other through the first opening 401 and the first through hole 82. The magnetic element 33 rotates with the rotating shaft 6 by the connecting portion 8. The connecting portion 8 brings the magnetic element 33 closer to the sensor 42, while improving the detection accuracy of the sensor 42 for the magnetic element 33. On the other hand, the material of the rotating shaft 6 is generally metal, and the connecting portion 8 reduces the influence of the metal on the magnetic flux lines of the magnetic element 33, thereby improving the magnetic detection accuracy of the control unit 4.

[0026] Referring to FIGS. 6A-6B, FIGS. 6A-6B are schematic diagrams of the rotating shaft 6 and the second rotor unit 31 of one embodiment of the present application. The rotating unit includes a magnetic shielding portion 9. Along the axial direction of the electric pump, the magnetic element 33 is located on one side of the magnetic shielding portion 9, the rotating shaft 6 is located on the other side of the magnetic shielding portion 9, the magnetic element 33 is fixed to the side wall of the magnetic shielding portion 9, or is integrally structured with the magnetic shielding portion 9. The material of the rotating shaft 6 is generally metal. The magnetic shielding portion 9 reduces the influence of the metal on the magnetic flux lines of the magnetic element 33, thereby improving the detection accuracy of the control unit 4.

[0027] Referring to FIGS. 10-20, the electric pump further includes a rotating shaft 6. The rotating shaft 6 is connected to the second rotor unit 31 for transmission, and includes a first end 61' and a second end 62'. Along the axial direction of the rotating shaft 6, the first end 61' is farther from the circuit board 41 than the second end 62'. The second end 62' is located in the first cavity 20, and the first end 61' is connected to the first rotor unit 21 for transmission. The first cavity 20 communicates with the second cavity 30. The electric pump includes a bottom wall 301. The first cavity 20 is located on one side of the bottom wall 301, and the second cavity 30 is located on the other side of the bottom wall 301. The bottom wall 301 supports the first rotor unit 21. The electric pump includes a second passage 50. The second passage 50 penetrates the upper and lower surfaces of the bottom wall 301 and communicates the first cavity 20 and the second cavity 30.

[0028] Referring to FIGS. 10 to 18, the electric pump further includes a first passage 40. The first passage 40 is provided with a first opening 401' and a second opening 402'. The first opening 401' is located at the first end 61' of the rotating shaft 6, and the second opening 402' communicates with the first cavity 20. In some embodiments, the second end 62' includes a first end face 611. The first passage 40 is provided with the second opening 402' at the first end face 611. The first end 61' includes a second end face 621. The first passage 40 is provided with the first opening 401' at the second end face 621. A part of the working medium in the first cavity 20 can leave the first cavity 20 through the first passage 40. Along the axial direction of the electric pump, the first opening 401' of the first passage 40 is closer to the inlet 5 of the electric pump than the second opening 402' of the first passage 40. The pressure of the working medium at the inlet of the second passage 50 is greater than the pressure of the working medium at the first opening 401' of the first passage 40. Thus, a pressure difference is formed between the inlet of the second passage 50 and the first opening 401' of the first passage 40 for the working medium. Based on the principle that the working medium flows from a high-pressure location to a low-pressure location, the working medium in the first cavity 20 flows in the direction of the first opening 401' of the first passage 40. That is, the working medium in the first cavity 20 can leave the first cavity 20 through the first passage 40. Since the stator unit 32 and the control unit 4 are located in the first cavity 20, the working medium takes away some heat from the stator unit 32 and the control unit 4, further improving the heat dissipation efficiency of the stator unit 32 and the control unit 4.

[0029] FIG. 18 shows the flow direction of the working medium. Referring to FIGS. 18 and 20, the electric pump includes an inlet 5 communicating with the first cavity 20. The working medium has two flow directions. In the first flow direction S1 of the working medium (refer to the thick dashed line), the working medium flows into the hydraulic chamber 10 of the first rotor unit 21 through the inlet 5 and then flows out of the hydraulic chamber 10 through the ejection port 7. In the second flow direction S2 of the working medium (refer to the thick solid line), a part of the working medium that enters the hydraulic chamber 10 of the first rotor unit 21 flows into the first cavity 20 through the second passage 50, and then the working medium in the first cavity 20 flows into the first passage 40 through the second opening 402'.

[0030] Referring to FIG. 19, FIG. 19 is a schematic diagram of another embodiment of the electric pump of the present application. The difference from the embodiment of FIG. 18 is at least that the flow direction of the working medium is different. Referring to FIGS. 19 and 20, a part of the working medium in the first cavity 20 flows into the second cavity 30 through the second passage 50. The working medium in the first cavity 20 contacts at least a part of the control unit 4 in the first cavity 20. Thereby, the working medium in the first cavity 20 can exchange heat with the heat generated from the control unit 4, contribute to the heat dissipation of the control unit 4, further extend the service life of the electric pump. Furthermore, at least a part of the stator unit 32 can also contact the working medium in the first cavity 20. Thereby, the working medium in the first cavity 20 can exchange heat with the heat generated from the stator unit 32 and contribute to the heat dissipation of the stator unit 32.

[0031] Referring to FIG. 19, the second end 62' includes the first end face, the first end 61' includes the second end face, and the electric pump further includes a first passage 40 provided to penetrate the first end face and the second end face. The electric pump includes an inlet 5 communicating with the first opening 401'. The working medium enters the first cavity 20 from the inlet 5 through the first passage 40. Along the axial direction of the electric pump, the first opening 401' of the first passage 40 is closer to the inlet 5 of the electric pump than the second opening 402' of the first passage 40. The pressure of the working medium at the first opening 401' of the first passage 40 is greater than the pressure of the working medium at the outlet of the second passage 50. Thereby, the working medium forms a pressure difference between the first opening 401' of the first passage 40 and the outlet of the second passage 50. Based on the principle that the working medium flows from the high-pressure location to the low-pressure location, the working medium in the first cavity 20 flows in the direction of the outlet of the second passage 50. Since the stator unit 32 and the control unit 4 are located in the first cavity 20, the working medium takes away a part of the heat of the stator unit 32 and the control unit 4, further improving the heat dissipation efficiency of the stator unit 32 and the control unit 4.

[0032] Referring to FIGS. 10 to 20, the control unit 4 includes a circuit board 41, a magnetic element 33, and a sensor 42. The sensor 42 is electrically connected and / or signal-connected to the circuit board 41 to detect the magnetic field of the magnetic element 33. The end of the rotating shaft 6 that approaches the circuit board 41 relatively is fixed and connected to the magnetic element 33, or is connected in a position-limited manner. Specifically, the magnetic element 33 is fixed and connected to the second end 62', or is connected in a position-limited manner.

[0033] Referring to FIGS. 14, 15, and 17, the second end 62' is provided with a first receiving hole 63. At least a part of the magnetic element 33 is located in the first receiving hole 63. The side wall forming the first receiving hole 63 is fixed and connected to the outer peripheral side of the magnetic element 33 (or the outer peripheral wall of the magnetic element 33), or is connected in a position-limited manner. In FIG. 15, the side wall of the first receiving hole 63 forms a step, and the outer peripheral wall of the magnetic element 33 abuts against the step. The second opening 402' of the first passage 40 is located on the outer side wall of the second end 62', or the magnetic element 33 is provided with a through hole 335 communicating with the first passage 40, and the through hole 335 of the magnetic element 33 communicates with the first cavity 20. By providing the magnetic element 33 inside the radial direction of the rotating shaft 6, the axial size of the electric pump is reduced, the structure becomes compact, and the manufacturing cost of the electric pump is reduced. On the other hand, the operating medium in the first cavity 20 flows out of the first cavity 20 through the through hole 335 and the second opening 402'. Since the stator unit 32 and the control unit 4 are located in the first cavity 20, the operating medium takes away part of the heat of the stator unit 32 and the control unit 4 through the through hole 335 and the second opening 402'.

[0034] Referring to FIGS. 16 and 17, the second end portion 62' includes a first end face 611, and the magnetic element 33 is fixedly connected to or connected in a position-limited manner to the first end face 611. The magnetic element 33 includes a through hole 335, and the through hole 335 communicates with the second opening 402' and the first cavity 20. The magnetic element 33 is fixedly connected to or connected in a position-limited manner to the first end face 611, close to the sensor 42, and the detection accuracy of the sensor 42 with respect to the magnetic element 33 is high. On the other hand, the operating medium in the first cavity 20 flows out of the first cavity 20 through the through hole 335 and the second opening 402'. Since the stator unit 32 and the control unit 4 are located in the first cavity 20, the operating medium takes away part of the heat of the stator unit 32 and the control unit 4 through the through hole 335 and the second opening 402'.

[0035] Referring to FIGS. 11 to 13, the magnetic element 33 is provided with a second receiving hole 334. At least a part of the second end portion 62' is located in the second receiving hole 334, and the outer peripheral side of the second end portion 62' is fixedly connected to or connected in a position-limited manner to the side wall forming the second receiving hole 334. The second end portion 62' includes a first end face 611. The first passage 40 is provided with a second opening 402' at the first end face 611. The magnetic element 33 is provided outside the radial direction of the rotating shaft 6, so as to reduce the size of the axial direction of the electric pump, make the structure compact, and reduce the manufacturing cost of the electric pump. On the other hand, the operating medium in the first cavity 20 flows out of the first cavity 20 through the second opening 402'. Since the stator unit 32 and the control unit 4 are located in the first cavity 20, the operating medium takes away part of the heat of the stator unit 32 and the control unit 4 through the second opening 402'.

[0036] Referring to FIGS. 10 and 11, along the radial direction of the rotating shaft 6, the rotating shaft 6 is located on one side of the magnetic shielding portion 9, and the magnetic element 33 is located on the other side of the magnetic shielding portion 9. Specifically, the magnetic shielding portion 9 is located on the outer periphery of the rotating shaft 6, and the magnetic element 33 is located on the outer periphery of the magnetic shielding portion 9. The magnetic shielding portion 9 is fixed to the wall portion of the magnetic element 33 or is integrally structured with the magnetic element 33. The material of the rotating shaft 6 is generally metal, and the magnetic shielding portion 9 reduces the influence of the metal on the magnetic flux lines of the magnetic element 33 to improve the magnetic field detection accuracy of the control unit.

[0037] Referring to FIGS. 2A-2D, FIGS. 3-4, FIGS. 5A-5B, FIGS. 6A-6B, FIGS. 7A-7B, FIGS. 8A-8B, FIGS. 9A-9C and FIGS. 10-20, the circuit board 41 includes a first surface 411 and a second surface 412. The first surface 411 faces the magnetic element 33 or the stator unit 32, and at least a part of the sensor 42 is located on the first surface 411 of the circuit board 41. The sensor 42 is, for example, a magnetic sensor such as a Hall integrated circuit (IC) or a magnetoresistive element. When the magnetic element 33 rotates, the magnetic flux changes, and the sensor 42 detects the change in magnetic flux caused by the rotation of the magnetic element 33. The rotating unit (or the rotating shaft 6) is connected to the second rotor unit 31 so as to transmit, thereby detecting the position of the second rotor unit 31. In some embodiments, the sensor 42 may be an encoder. Along the axial direction of the electric pump or the axial direction of the rotating shaft 6, there is a predetermined gap between the magnetic element 33 and the sensor 42. The projected shape of the magnetic element 33 on the first surface 411 is circular or substantially circular (when the shape of the magnetic element 33 changes, the projected shape of the magnetic element 33 also changes correspondingly). The sensor 42 is located within the projected range of the magnetic element 33 on the first surface 411. For example, the projected shape of the magnetic element 33 on the first surface 411 is circular, and the sensor 42 is located within the circle, or the projection of the magnetic element 33 on the first surface 411 at least partially overlaps the sensor 42. In this way, the magnetic flux lines are concentrated, the magnetic field is strong, and the detection accuracy of the sensor 42 is high. Further, the central axis of the rotating shaft 6 or the extension line of the central axis of the rotating shaft 6 passes through the sensor 42. In some embodiments, the magnetic element 33 includes an upper magnetic surface 331 and a lower magnetic surface 332. Along the axial direction of the rotating shaft 6, the upper magnetic surface 331 is away from the lower magnetic surface 332 with respect to the control unit 4 (or the circuit board 41). The axial distance between the sensor 42 and the lower magnetic surface 332 of the magnetic element 33 is 2 cm or less, which can guarantee the accuracy of the sensor 42. On the other hand, the operating medium is provided with a flow path of a certain width to guarantee the heat dissipation effect of the operating medium on the control unit 4. Further, the axial distance between the sensor 42 and the lower magnetic surface 332 is 1 cm or less. Further, the axial distance between the sensor 42 and the lower magnetic surface 332 is 6 mm or less.On the premise that the axial distance between the sensor 42 and the lower magnetic surface 332 satisfies the condition of being 2 cm or less, the sensor 42 may be provided at other positions on the second surface 412.

[0038] Here, the above embodiments do not limit the technical solutions described in this application, but are merely for explaining this application. Although this specification has already described this application in detail with reference to the above embodiments, as can be understood by those skilled in the art, those skilled in the art may still make corrections or equivalent replacements to this application. All technical solutions and their improvements that do not deviate from the spirit and scope of this application should fall within the scope of the claims of this application.

Description of Reference Numerals

[0039] 1 ··· Pump casing; 11 ··· Pump cover; 12 ··· First housing; 13 ··· Second housing; 2 ··· Pump unit; 21 ··· First rotor unit; 211 ··· First rotor; 212 ··· Second rotor; 3 ··· Motor unit; 31 ··· Second rotor unit; 32 ··· Stator unit; 32a ··· Stator core; 32b ··· Insulating bracket; 32c ··· Winding; 33 ··· Magnetic element; 331 ··· Upper magnetic surface; 332 ··· Lower magnetic surface; 333 ··· Second through-hole; 334 ··· Second receiving hole; 335 ··· Through-hole; 4 ··· Control unit; 41 ··· Circuit board; 411 ··· First surface; 412 ··· Second surface; 42 ··· Sensor; 5 ··· Entrance; 6 ··· Rotation axis; 61 / 61’ ··· First end; 611 ··· First end face; 612 ··· First side face; 62 / 62’ ··· Second end; 621 ··· Second end face; 63 ··· First receiving hole; 7 ··· Spray outlet; 8 ··· Connection part; 81 ··· Receiving hole; 82 ··· First through hole; 9 ··· Magnetic shielding part; 10 ··· Hydraulic chamber; 20 ··· First cavity; 30 ··· Second cavity; 301 ··· Bottom wall; 40 ··· First passage; 401 / 401’ ··· First opening; 402 / 402’ ··· Second opening; 50 ··· Second passage.

Claims

1. An electric pump, wherein the electric pump comprises a first cavity (20), there is an operating medium in the first cavity (20) when the electric pump operates, the electric pump includes a control unit (4) and a rotating unit, the control unit (4) is located in the first cavity (20), at least a part of the rotating unit is located in the first cavity (20), the control unit (4) includes a circuit board (41), a magnetic element (33) and a sensor (42), the circuit board (41) is electrically connected and / or signal-connected to the sensor (42), an end of the rotating unit that is relatively close to the circuit board (41) is fixed and connected to the magnetic element (33) or connected in a position-limited manner, the circuit board (41) includes a first surface (411) facing the magnetic element (33), at least a part of the sensor (42) is located on the first surface (411), the magnetic element (33) is located within the detection range of the sensor (42), at least a part of the projection of the magnetic element (33) on the first surface (411) overlaps the sensor (42), or the sensor (42) is located within the projection range of the magnetic element (33) on the first surface (411). An electric pump characterized by this.

2. The rotating unit includes a first end (61), the magnetic element (33) is fixed and connected to the first end (61) or connected in a position-limited manner, the electric pump comprises a first passage (40), the first passage (40) has a first opening (401) in the side wall of the first end (61), and the first passage (40) communicates with the first cavity (20). The electric pump according to claim 1, characterized by this.

3. The rotation unit includes a rotation shaft (6), the rotation shaft (6) includes a first end (61), the first end (61) includes a first end face (611) and a first side face (612), the electric pump is provided with a first passage (40), the first passage (40) is provided with a first opening (401), a part of the first openings (401) are located on the first end face (611), another part of the first openings (401) are located on the first side face (612), the magnetic element (33) is fixedly connected to the first end face (611), or connected so as to be position-limited, and the first opening (401) communicates with the first cavity (20). The electric pump according to claim 1, characterized in that.

4. The rotation unit includes a rotation shaft (6), the rotation shaft (6) includes the first end (61), the first end (61) includes a first end face (611) and a first side face (612), the magnetic element (33) is fixedly connected to the first end face (611), or connected so as to be position-limited, the first passage (40) is provided with at least two of the first openings (401) on the first side face (612), the first openings (401) are arranged along the radial direction of the rotation shaft (6), or along the axial direction of the rotation shaft (6), and the first opening (401) communicates with the first cavity (20). The electric pump according to claim 2, characterized in that.

5. The rotation unit includes a rotation shaft (6) and a magnetic shielding portion (9). Along the axial direction of the electric pump, the magnetic element (33) is located on one side of the magnetic shielding portion (9), the rotation shaft (6) is located on the other side of the magnetic shielding portion (9), and the magnetic element (33) is fixedly connected to the side wall of the magnetic shielding portion (9), or is structured integrally with the magnetic shielding portion (9). The electric pump according to any one of claims 2 to 4, characterized in that.

6. The rotating unit includes a rotating shaft (6) and a connecting portion (8), the connecting portion (8) includes a receiving hole (81), at least a part of the rotating shaft (6) is located in the receiving hole (81), and the side wall forming the receiving hole (81) is fixed and connected to, or connected so as to be position-limited to, the outer side wall of at least a part of the rotating shaft (6). The magnetic element (33) is fixed and connected to, or connected so as to be position-limited to, the outer side wall of the connecting portion (8). The connecting portion (8) includes a first through hole (82), and the first through hole (82) communicates with the first opening (401) and the first cavity (20). The electric pump according to any one of claims 2 to 4, characterized in that.

7. The first end portion (61) includes a first end face (611), the magnetic element (33) is fixed and connected to the first end face (611), or connected so as to be position-limited, and includes a second through hole (333), and the second through hole (333) communicates with the first passage (40) and the first cavity (20). The electric pump according to any one of claims 2 to 4, characterized in that.

8. The first end portion (61) includes a first end face (611), the magnetic element (33) is fixed and connected to the first end face (611), or connected so as to be position-limited, and includes a second through hole (333), and the second through hole (333) communicates with the first passage (40) and the first cavity (20). The electric pump according to claim 5, characterized in that.

9. The electric pump includes a first rotor unit (21) and a second rotor unit (31), the electric pump is provided with a second cavity (30) and a first passage (40), the first rotor unit (21) is located in the second cavity (30), the rotating unit includes a rotating shaft (6), the second rotor unit (31) is located in the first cavity (20) and is connected to the rotating shaft (6) so as to transmit power, the rotating shaft (6) includes a first end (61') and a second end (62'), along the axial direction of the rotating shaft (6), the first end (61') is farther from the circuit board (41) than the second end (62'), the first passage (40) is provided with a first opening (401') and a second opening (402'), the first opening (401') is located at the first end (61'), the second opening (402') communicates with the first cavity (20), the second end (62') is located in the first cavity (20), the first end (61') is connected to the first rotor unit (21) so as to transmit power, the magnetic element (33) is fixedly connected to the second end (62'), or is connected so as to be position-limited. The electric pump according to claim 1, characterized in that.

10. The second end (62') is provided with a first receiving hole (63), at least a part of the magnetic element (33) is located in the first receiving hole (63), the side wall forming the first receiving hole (63) is fixedly connected to the outer peripheral side of the magnetic element (33), or is connected so as to be position-limited, and the second opening (402') of the first passage (40) is located on the outer side wall of the second end (62'). The electric pump according to claim 9, characterized in that.

11. The magnetic element (33) is provided with a second receiving hole (334), at least a part of the second end (62') is located in the second receiving hole (334), the outer peripheral side of the second end (62') is fixedly connected to the side wall forming the second receiving hole (334), or is connected so as to be position-limited, the second end (62') includes a first end face (611), and the first passage (40) is provided with the second opening (402') at the first end face (611). The electric pump according to claim 9, characterized in that.

12. The second end portion (62') includes a first end face (611), and the magnetic element (33) is fixedly connected or connected in a position-limited manner to the first end face (611). The magnetic element (33) is provided with a through hole (335), and the through hole (335) communicates with the first opening (401') and the first cavity (20). The electric pump according to claim 9, characterized in that.

13. The electric pump includes a magnetic conduction prevention portion (9). Along the radial direction of the rotating shaft (6), the magnetic element (33) is located on one side of the magnetic conduction prevention portion (9), and the rotating shaft (6) is located on the other side of the magnetic conduction prevention portion (9). The magnetic conduction prevention portion (9) is fixed to the inner side wall of the magnetic element (33) or is structured integrally with the magnetic element (33). The electric pump according to any one of claims 9 to 12, characterized in that.

14. The magnetic element (33) includes an upper magnetic surface (331) and a lower magnetic surface (332). Along the axial direction of the rotating shaft (6), the upper magnetic surface (331) is away from the circuit board (41) with respect to the lower magnetic surface (332), and the axial distance between the lower magnetic surface (332) and the sensor (42) is 2 cm or less. The electric pump according to claim 2, characterized in that.

15. The electric pump includes a bottom wall (301), and the electric pump is provided with a second cavity (30). In the axial direction of the electric pump, the second cavity (30) is located on one side of the bottom wall (301), and the first cavity is located on the other side of the bottom wall (301). The electric pump includes a second passage (50), and the second passage (50) penetrates the upper and lower surfaces of the bottom wall (301) and communicates the first cavity (20) and the second cavity (30). The electric pump according to claim 2 or 14, characterized in that.

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