Electric pump

Abstract

The electric pump comprises a rotating assembly and an electric control assembly, the electric pump is provided with a first cavity, the electric control assembly and at least part of the rotating assembly are located in the first cavity, the electric pump is provided with a cavity inflow channel, the cavity inflow channel communicates with the first cavity, the electric control assembly comprises a circuit board and a temperature detection unit, and the temperature detection unit is electrically connected with the circuit board. The temperature detection unit comprises a temperature sensing part, and the rotating assembly comprises a first end part; the cavity inflow channel is provided with a channel opening in the end face of the first end, and at least part of the temperature sensing part is located in the cavity inflow channel. Or, the cavity inflow channel is provided with a flow channel opening in the side wall of the first end part, and at least part of the temperature sensing part can be opposite to the flow channel opening in the radial direction of the electric pump. 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 an electric pump. [Background technology]

[0002] The electric pump mainly provides power for the vehicle's lubrication system and / or cooling system. The electric pump includes a motor cavity. When the electric pump is working, the working medium of the lubrication system and / or cooling system will flow into the motor cavity. Since the electronic control components located in the motor cavity will generate heat, there is a temperature difference between the temperature of the working medium in the motor cavity and the working medium of the lubrication system and / or cooling system. The temperature of the working medium of the lubrication system and / or cooling system will affect the service life of certain components in the system. If the temperature of the working medium of the lubrication system and / or cooling system cannot be accurately detected, the high temperature of the working medium will shorten the service life of these components. [Contents of the utility model]

[0003] The purpose of the present application is to provide an electric pump, which is conducive to accurately detecting the temperature of the working medium of the lubrication system and / or the cooling system.

[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 a rotating assembly and an electric control assembly, the electric pump having a first cavity, the electric control assembly and at least part of the rotating assembly being located in the first cavity, the electric pump having a cavity inlet flow channel, the cavity inlet flow channel being connected to the first cavity, the electric control assembly comprising a circuit board and a temperature detection unit, the temperature detection unit being electrically connected to the circuit board, the temperature detection unit comprising a temperature sensing portion, the rotating assembly comprising a first end portion; the cavity inlet flow channel having a flow channel opening at an end surface of the first end portion, at least part of the temperature sensing portion being located in the cavity inlet flow channel; or,

[0006] The side wall of the cavity inlet channel at the first end has a flow channel opening, and in the radial direction of the electric pump, at least a part of the temperature sensing portion can be opposite to the flow channel opening.

[0007] In the above technical solution, the cavity inlet flow channel is connected to the first cavity, and the cavity inlet flow channel has a flow channel opening on the end face of the first end, and at least part of the temperature sensing part is located in the cavity inlet flow channel; or, the cavity inlet flow channel has a flow channel opening on the side wall of the first end, and in the radial direction of the electric pump, at least part of the temperature sensing part can be opposite to the flow channel opening. When the electric pump is working, the working medium of the lubrication system and / or the cooling system can flow into the first cavity through the flow channel opening, and the temperature detection unit can be arranged close to the flow channel opening. The temperature detection unit can timely detect the temperature of the working medium of the lubrication system and / or the cooling system, which is conducive to accurately detecting the temperature of the working medium of the lubrication system and / or the cooling system.

Brief Description of the Drawings

[0008] Figure 1 is a schematic diagram of a first embodiment of the electric pump of the present application;

[0009] Figure 2 yes Figure 1 An exploded schematic diagram of the electric pump shown;

[0010] Figure 3 yes Figure 1 Schematic diagram of the middle BB section;

[0011] Figure 4 yes Figure 3 A magnified schematic diagram of part C;

[0012] Figure 5 yes Figure 3 A schematic diagram of a first embodiment of a rotating assembly shown in ;

[0013] Figure 6 yes Figure 5 A schematic diagram of the first embodiment of the cross section DD;

[0014] Figure 7 yes Figure 5 A schematic diagram of a second embodiment of the cross section DD;

[0015] Figure 8 yes Figure 3 A schematic diagram of a second embodiment of a rotating assembly shown in ;

[0016] Fig. 9 yes Figure 8 A schematic cross-sectional view of a rotating assembly in FIG.

[0017] Fig.10 is a schematic diagram of a second embodiment of the electric pump of the present application;

[0018] Fig.11 yes Fig.10 The enlarged schematic diagram of part E in the middle;

[0019] Fig.12 A schematic diagram of a third embodiment of the electric pump of the present application;

[0020] Fig.13 yes Fig.12 Enlarged schematic diagram of the X part in the figure.

[0021] Figure numerals: 1, pump cover; 11, first inlet channel; 12, outlet channel; 13, second inlet channel; 2, first housing; 3, second housing; 4, first rotor assembly / pump rotor; 5, stator assembly; 51, stator core; 52, winding; 6, second rotor assembly / motor rotor; 70, rotating assembly; 701, first end; 702, second end; 703, flow channel opening; 7, pump shaft; 72, first end face; 73, second end face; 74, receiving groove; 741, Groove wall; 7411, first side wall; 7412, second side wall; 75, detection member; 8, electronic control component; 81, circuit board; 811, front side; 812, back side; 82, temperature detection unit; 822, temperature sensing part; 823, conductive part; 83, sensor; 9, connecting part; 91, accommodating groove; 92, through hole; 921, first opening; 922, second opening; 95, accommodating hole; 20, first cavity; 30, second cavity; 40, cavity inlet flow channel; 50, cavity outlet flow channel. [Specific implementation method]

[0022] The present application is further described below with reference to the accompanying drawings and specific embodiments:

[0023] 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.

[0024] The electric pump can be applied to the automobile lubrication system and / or cooling system, and can provide the working medium in the automobile lubrication system and / or cooling system with the circulating power of the flow, and the automobile lubrication system and / or cooling system can provide the transmission system with lubricating oil and / or cooling oil. In the present application, "A and B are fixedly connected" means that there is no relative displacement between A and B after the connection, for example, A and B are fixed by welding; "A and B are limitedly connected" means that A limits B to move in a certain direction, or B limits A to move in a certain direction.

[0025] Please refer to Figures 1 to 3 , Fig.10 and Fig.12The 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.

[0026] The electric pump includes a first rotor assembly (or pump rotor) 4, a stator assembly 5, a second rotor assembly (or motor rotor) 6, a rotating assembly 70 and an electronic control assembly 8. The stator assembly 5 is located at 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 rotating assembly 70 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. The stator assembly 5 is electrically connected to the electric control assembly 8. The stator assembly 5 includes a stator core 51 and a winding 52. When the electric pump is working, the electric 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. The second rotor assembly 6 can directly or indirectly drive the first rotor assembly 4 to rotate. In this embodiment, the rotating assembly 70 includes a pump shaft 7, which is transmission-connected to the first rotor assembly 4, and the pump shaft 7 is transmission-connected to the second rotor assembly 6. The electric pump includes a detection member 75 and a sensor 83. The sensor 83 is electrically connected to the circuit board 81. The detection member 75 and the sensor 83 are correspondingly arranged to detect the phase of the second rotor assembly 6.

[0027] The electric pump includes a first inlet channel 11, a second inlet channel 13 and an outlet channel 12. The first inlet channel 11 and the second inlet channel 13 are used for the inflow of the working medium, and the outlet channel 12 is used for the outflow of the working medium. The electric pump has a cavity inlet channel 40 and a cavity outlet channel 50. The second inlet channel 13 is connected to the cavity inlet channel 40, the cavity inlet channel 40 is connected to the first cavity 20, and the cavity outlet channel 50 is connected to the first cavity 20. The working medium can enter the first cavity 20 from the cavity inlet channel 40, so that the working medium in the first cavity 20 can exchange heat with the heat generated by the electric control component 8, which is beneficial to the heat dissipation of the electric control component 8, and further beneficial 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 in the first cavity 20, so that the working medium in the first cavity 20 can exchange heat with the heat generated by the stator component 5, which is beneficial to the heat dissipation of the stator component 5. 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.

[0028] Please refer to Figures 1 to 13 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. The temperature detection unit 82 includes a temperature sensing portion 822. The rotating component 70 includes a first end portion 701. The cavity inlet flow channel 40 has a flow channel opening 703 on the end surface of the first end portion 701. At least part of the temperature sensing portion 822 is located in the cavity inlet flow channel 40. Alternatively, the cavity inlet flow channel 40 has a flow channel opening 703 on the side wall of the first end portion 701. In the radial direction of the electric pump, at least part of the temperature sensing portion 822 can be opposite to the flow channel opening 703. When the electric pump is working, the working medium of the lubrication system and / or the cooling system can flow into the first cavity 20 through the flow channel opening 703. The temperature detection unit 82 can be arranged close to the flow channel opening 703. The temperature detection unit 82 can timely detect the temperature of the working medium of the lubrication system and / or the cooling system, which is conducive to accurately detecting the temperature of the working medium of the lubrication system and / or the cooling system. The circuit board 81 includes a front side 811. In a direction parallel to the axial direction of the electric pump, a length h1 of the temperature detection unit 82 extending from the front side 811 is greater than a minimum distance h2 from the front side 811 to the flow channel opening 703, and is less than or equal to a maximum distance h3 from the front side 811 to the flow channel opening 703. The temperature detection unit 82 can timely detect the temperature of the working medium flowing out of the flow channel opening 703.

[0029] In one embodiment, please refer to Fig.10and Fig.11 The rotating assembly 70 includes a pump shaft 7, and the motor rotor 6 is fixedly connected or limit-connected to the pump shaft 7. The cavity inlet flow channel 40 passes through the first end face 72 and the second end face 73 of the pump shaft 7. The cavity inlet flow channel 40 has a flow channel opening 703 on the first end face 72. At least part of the temperature sensing portion 822 is located in the cavity inlet flow channel 40. When the electric pump is working, the working medium can directly enter the first cavity 20 from the cavity inlet flow channel 40. When the temperature detection unit 82 detects the temperature of the working medium, the temperature of the working medium is less affected by other factors, which is conducive to improving the accurate detection of the temperature of the working medium; secondly, the temperature sensing portion 822 can have a larger contact area with the working medium in the cavity inlet flow channel 40, which is conducive to improving the detection accuracy of the temperature detection unit 82.

[0030] In one embodiment, please refer to Figures 1 to 7 The rotating assembly 70 includes a second end 702. Along the axial direction of the electric pump, the second end 702 is away from the circuit board 81 relative to the first end 701. The rotating assembly 70 includes a pump shaft 7. The rotating assembly 70 has a receiving groove 74. The receiving groove 74 is concave from the first end 701 to the second end 702. The cavity inlet flow channel 40 has at least one flow channel opening 703 on the groove wall 741 of the receiving groove 74. At least part of the temperature sensing portion 822 is located in the receiving groove 74. The working medium flows into the receiving groove 74 from the flow channel opening 703. When the temperature detection unit 82 detects the temperature of the working medium, the temperature of the working medium is less affected by other factors, which is conducive to improving the accurate detection of the temperature of the working medium; secondly, the temperature sensing portion 822 can have a larger contact area with the working medium in the receiving groove 74, which is conducive to improving the detection accuracy of the temperature detection unit 82. In some embodiments, please refer to Figure 6 and Figure 7 , the pump shaft 7 has a receiving groove 74; or the rotating assembly 70 includes a pump shaft 7 and a connecting portion 9, the pump shaft 7 and the connecting portion 9 are fixedly connected or limit-connected, the connecting portion 9 has a receiving groove 74, and the preparation process of the rotating assembly 70 can be relatively simple.

[0031] The groove wall 741 includes a first side wall 7411 and a second side wall 7412. In the radial direction of the electric pump, the first side wall 7411 is close to the central axis of the electric pump relative to the second side wall 7412. The cavity inlet channel 40 has at least one flow channel opening 703 on the first side wall 7411. In the radial direction of the electric pump, at least part of the temperature detection unit 82 can be located between the flow channel opening 703 and the second side wall 7412. When the temperature detection unit 82 detects the temperature of the working medium, the temperature of the working medium is less affected by other factors, which is conducive to improving the accurate detection of the temperature of the working medium; further, in the radial direction of the electric pump, the temperature sensing part 822 is located between the flow channel opening 703 and the second side wall 7412. After the working medium flows out of the flow channel opening 703, the temperature detection unit 82 can detect the temperature of the working medium in time, which is conducive to improving the accurate detection of the temperature of the working medium. In the radial direction of the electric pump, the width of the first end 701 is greater than the width of the second end 702, which can enable the first side wall 7411 and the second side wall 7412 to have a certain distance in the radial direction, so that the accommodating groove 74 has a larger accommodating space to accommodate the temperature detection unit 82, which is beneficial to reducing the assembly accuracy of the temperature detection unit 82, thereby helping to improve the assembly efficiency of the electric pump.

[0032] In one embodiment, please refer to Figure 8 and Fig. 9 The rotating assembly 70 includes a pump shaft 7 and a connecting portion 9. The pump shaft 7 and the connecting portion 9 are integrally structured, and the connecting portion 9 is formed by injection molding with a temperature detection unit 82 as an insert; or the pump shaft 7 and the connecting portion 9 are separated structures, and the connecting portion 9 is formed by injection molding with a mold, and the pump shaft 7 and the connecting portion 9 are fixedly connected or limitedly connected, and the preparation process is relatively simple. The connecting portion 9 is fixedly connected or limitedly connected with the pump shaft 7, and the cavity inlet flow channel 40 has a flow channel opening 703 on the outer wall of the pump shaft 7, and the connecting portion 9 has a receiving groove 91 and a through hole 92, and the receiving groove 91 is connected with the through hole 92, and the through hole 92 is connected with the flow channel opening 703, and the through hole 92 is connected with the first cavity 20, and at least part of the temperature sensing portion 822 is located in the through hole 92, and the working medium in the cavity inlet flow channel 40 flows into the first cavity 20 through the through hole 92, and when the temperature detection unit 82 detects the temperature of the working medium, the temperature of the working medium is less affected by other factors, which is conducive to improving the accurate detection of the temperature of the working medium.

[0033] Please refer to Figure 8 and Fig. 9The hole wall of the through hole 92 includes part of the groove wall of the accommodating groove 91. The through hole 92 has a first opening 921 on the inner wall of the connecting portion 9, and the first opening 921 is connected to the flow channel opening 703. The through hole 92 has a second opening 922 on the outer wall of the connecting portion 9, and the second opening 922 is connected to the first cavity 20. The working medium can enter the first cavity 20 through the second opening 922. The working medium in the first cavity 20 can exchange heat with the heat generated by the electric control component 8, which is beneficial to the heat dissipation of the electric control component 8, and further beneficial to improving the service life of the electric pump. The temperature detection unit 82 includes a temperature sensing portion 822 and a conductive portion 823. The conductive portion 823 is electrically connected to the circuit board 81. The conductive portion 823 is electrically connected to the temperature sensing portion 822. Generally, the radial cross-sectional area of ​​the conductive portion 823 is relatively small, and the radial impact resistance is relatively low. At least part of the conductive portion 823 is located in the accommodating groove 91, which is beneficial to reducing the impact of the working medium on the conductive portion 823, thereby facilitating the connection reliability between the temperature detection unit 82 and the circuit board 81. The connecting portion 9 includes a receiving hole 95, and at least part of the pump shaft 7 is located in the receiving hole 95, so that the side wall of the receiving hole 95 is fixedly connected or limit-connected to the outer wall of at least part of the pump shaft 7, and the temperature detection unit 82 can be close to the flow channel opening 703. When the temperature detection unit 82 detects the temperature of the working medium, the temperature of the working medium is less affected by other factors, which is conducive to improving the accurate detection of the temperature of the working medium; secondly, the detection member 75 can be fixedly connected or limit-connected to the connecting portion 9, and the detection element can be close to the sensor 83 through the connecting portion 9, thereby improving the accuracy of the sensor 83 sensing the detection member 75; on the other hand, the material of the pump shaft 7 is generally a magnetic conductive material, and the material of the connecting portion 9 is, for example, plastic. The connecting portion 9 separates the pump shaft 7 from the detection member 75, thereby reducing the influence of the pump shaft 7 on the magnetic induction lines of the detection member 75, thereby improving the accuracy of the sensor 83 sensing magnetism.

[0034] 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 a rotating assembly (70) and an electric control assembly (8), the electric pump having a first cavity (20), the electric control assembly (8) and at least a part of the rotating assembly (70) being located in the first cavity (20), the electric pump having a cavity inlet flow channel (40), the cavity inlet flow channel (40) being connected to the first cavity (20), the electric control assembly (8) comprising a circuit board (81) and a temperature detection unit (82), the temperature detection unit (82) being electrically connected to the circuit board (81), the temperature detection unit (82) comprising a temperature sensing portion (822), the rotating assembly (70) comprising a first end portion (701); the cavity inlet flow channel (40) having a flow channel opening (703) at an end surface of the first end portion (701), at least a part of the temperature sensing portion (822) being located in the cavity inlet flow channel (40); or, The cavity inlet channel (40) has a flow channel opening (703) on the side wall of the first end (701), and in the radial direction of the electric pump, at least part of the temperature sensing portion (822) can be opposite to the flow channel opening (703).

2. The electric pump according to claim 1, characterized in that: The rotating assembly (70) includes a pump shaft (7), and the electric pump includes a motor rotor (6), the motor rotor (6) is fixedly connected or limit-connected to the pump shaft (7), the cavity inlet flow channel (40) passes through the first end surface (72) and the second end surface (73) of the pump shaft (7), the cavity inlet flow channel (40) has the flow channel opening (703) on the first end surface (72), and at least a part of the temperature sensing part (822) is located in the cavity inlet flow channel (40).

3. The electric pump according to claim 1, characterized in that: The rotating assembly (70) includes a second end portion (702), and along the axial direction of the electric pump, the second end portion (702) is away from the circuit board (81) relative to the first end portion (701), and the rotating assembly (70) has a receiving groove (74), and the receiving groove (74) is concave from the first end portion (701) to the second end portion (702), and the cavity inlet flow channel (40) has at least one flow channel opening (703) on the groove wall (741) of the receiving groove (74), and at least a part of the temperature sensing portion (822) is located in the receiving groove (74).

4. The electric pump according to claim 3, characterized in that: The groove wall (741) includes a first side wall (7411) and a second side wall (7412). In the radial direction of the electric pump, the first side wall (7411) is closer to the central axis of the electric pump relative to the second side wall (7412). The cavity inlet channel (40) has at least one flow channel opening (703) on the first side wall (7411). In the radial direction of the electric pump, at least part of the temperature sensing portion (822) can be located between the flow channel opening (703) and the second side wall (7412).

5. The electric pump according to claim 3 or 4, characterized in that: The rotating assembly (70) comprises a pump shaft (7), the pump shaft (7) having the accommodating groove (74), or the rotating assembly (70) comprises a pump shaft (7) and a connecting portion (9), the connecting portion (9) being fixedly connected, position-limitedly connected or integrally structured with the pump shaft (7), and the connecting portion (9) having the accommodating groove (74).

6. The electric pump according to claim 1, characterized in that: The rotating assembly (70) comprises a pump shaft (7) and a connecting portion (9), wherein the connecting portion (9) is fixedly connected, positionally connected or integrally structured with the pump shaft (7), the cavity inlet channel (40) has the flow channel opening (703) on the outer wall of the pump shaft (7), the connecting portion (9) has a receiving groove (91) and a through hole (92), the receiving groove (91) is communicated with the through hole (92), the through hole (92) is communicated with the flow channel opening (703), the through hole (92) is communicated with the first cavity (20), and at least a portion of the temperature sensing portion (822) is located in the through hole (92).

7. The electric pump according to claim 6, characterized in that The hole wall of the through hole (92) includes a portion of the groove wall of the accommodating groove (91); the through hole (92) has a first opening (921) on the inner wall of the connecting portion (9); the first opening (921) is connected to the flow channel opening (703); the through hole (92) has a second opening (922) on the outer wall of the connecting portion (9); the second opening (922) is connected to the first cavity (20).

8. The electric pump according to claim 6 or 7, characterized in that: The temperature detection unit (82) comprises a conductive part (823), the conductive part (823) is electrically connected to the circuit board (81), the conductive part (823) is electrically connected to the temperature sensing part (822), and at least a portion of the conductive part (823) is located in the accommodating groove (91).

9. The electric pump according to any one of claims 5 to 8, characterized in that: The connecting portion (9) comprises a receiving hole (95), and at least a portion of the pump shaft (7) is located in the receiving hole (95), so that a side wall of the receiving hole (95) is fixedly connected or position-limitedly connected to an outer side wall of at least a portion of the pump shaft (7).

10. The electric pump according to claim 5 or 6, characterized in that: The connecting portion (9) is an integral structure with the pump shaft (7), and the connecting portion (9) is formed by injection molding with the temperature detection unit (82) as an insert; or the connecting portion (9) is formed by mold injection molding, and the connecting portion (9) is fixedly connected or limit-connected to the pump shaft (7).

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