electric pump

Abstract

An electric pump includes a base and a connecting terminal, the connecting terminal being electrically connected to a winding and a circuit board; the electric pump includes a first chamber and a second chamber, the base preventing the first chamber and the second chamber from communicating, which simplifies the electric pump.

Description

[Technical Field]

[0001] This invention relates to the field of vehicles, and more particularly to a pump device. [Background Technology]

[0002] With the rapid development of the vehicle industry, electric pumps are widely used in vehicle lubrication and / or cooling systems. Electric pumps mainly provide a power source for vehicle lubrication and / or cooling systems, and designing an electric pump with a relatively simple structure is a technical issue that needs to be considered. [Summary of the Invention]

[0003] The purpose of this invention is to provide a relatively simple electric pump.

[0004] One embodiment of the present invention adopts the following technical solution: an electric pump, including a rotor assembly and a stator assembly, wherein a gap exists between the rotor assembly and the stator assembly along the axial direction of the electric pump, and the rotor assembly is positioned above the stator assembly; the stator assembly includes a stator core and at least one winding, the stator core includes a base and at least one first protrusion, the first protrusion protrudes from the base toward the rotor assembly, the winding is capable of forming a winding through hole, and at least a portion of the first protrusion is located within at least a portion of the winding through hole;

[0005] The electric pump also includes a circuit board and a pump housing. The pump housing is capable of forming a pump cavity, which includes a first cavity and a second cavity. The connection between the base and the pump housing is sealed. The first cavity and the second cavity are not in communication. The first cavity is located on one side of at least a portion of the base, and the second cavity is located on the opposite side of at least a portion of the base. At least a portion of the rotor assembly and the first protrusion are located in the first cavity, and the circuit board is located in the second cavity.

[0006] The stator assembly further includes at least one connecting terminal, one end of which is connected to the winding, and the other end of which is connected to the circuit board. The connecting terminal includes a body, and at least a portion of the body is sealed at the connection with the base, or at least a portion of the body is injection molded to the base. The electric pump includes a stator assembly, which includes a stator core and a connecting terminal. The stator core includes a base. The connection between the body of the connecting terminal and the base is sealed, or the body is injection molded to the base. The connecting terminal can connect the winding and the circuit board to achieve the connection between the winding and the circuit board. The electric pump includes a first chamber and a second chamber. The first chamber is located on one side of the base, and the second chamber is located on the other side of the base. The circuit board is located in the second chamber, and the winding is located in the first chamber. The connection between the base and the pump housing is sealed. The first and second chambers are not connected. By providing a base and a connecting terminal, the structure of the electric pump is relatively simplified. [Attached Image Description]

[0007] Figure 1 This is a three-dimensional schematic diagram of an electric pump according to a technical solution of the present invention;

[0008] Figure 2 yes Figure 1 Schematic diagram of the first section along AA;

[0009] Figure 3 yes Figure 1 Schematic diagram of the second section along AA;

[0010] Figure 4 This is a three-dimensional schematic diagram of the third housing of one technical solution of the present invention;

[0011] Figure 5 This is a cross-sectional schematic diagram of the second shell of one technical solution of the present invention;

[0012] Figure 6 This is a three-dimensional schematic diagram of the pump shaft;

[0013] Figure 7 This is a perspective view of the base and connecting terminals of the first embodiment;

[0014] Figure 8 yes Figure 7 A cross-sectional schematic diagram;

[0015] Figure 9 This is a perspective view of a second embodiment of the base and connecting terminals;

[0016] Figure 10 yes Figure 9 Another three-dimensional diagram;

[0017] Figure 11 yes Figure 9 A cross-sectional schematic diagram;

[0018] Figure 12 This is a three-dimensional schematic diagram of the connection terminals;

[0019] Figure 13 This is a schematic diagram of the combination of the first rotor assembly, pump shaft, first housing and second housing;

[0020] Figure 14 yes Figure 1 Schematic diagram of the third section along AA;

[0021] Figure 15 yes Figure 1 Schematic diagram of the fourth section along AA.

Detailed Implementation Methods

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: The electric pump in this embodiment is mainly capable of providing flow power for the working medium of the vehicle's lubrication system and / or cooling system, specifically capable of providing flow power for the working medium of the lubrication system and / or cooling system in the vehicle's transmission system. See also Figures 1-3 and Figure 8 The electric pump 1 includes a pump housing, a rotor assembly, a stator assembly 40, and a circuit board 80. A gap exists between the rotor assembly and the stator assembly 40 along the axial direction of the electric pump. For ease of description of the positional relationship of the various parts of the electric pump, the rotor assembly is defined as being located above the stator assembly 40 along the axial direction of the electric pump; however, "above" here is not limited to a physical vertical relationship. The stator assembly 40 includes a stator core 41 and a winding 42. The stator core 41 includes a base 411 and at least one first protrusion 413. Along the axial direction of the electric pump, the first protrusion 413 protrudes from the base 411 toward the rotor assembly. The winding 42 is wound around the first protrusion 413, and one opening of the winding is approximately in the same direction as the extension direction of the first protrusion 413. When there is one first protrusion, the first protrusion is approximately annular; in this embodiment, the number of first protrusions is six.

[0023] The pump housing forms the pump cavity, where the rotor assembly and circuit board 80 are located. At least a portion of the stator assembly 40 is also located within the pump cavity. In this embodiment, the pump cavity includes a first cavity 201 and a second cavity 202. The base 411 separates the first cavity 201 and the second cavity 202, and the first and second cavities are not connected. The first cavity 201 is located on the upper surface side of the base 411, and the second cavity 202 is located on the lower surface side of the base 411. At least a portion of the rotor assembly is located in the first cavity. The first protrusion 413 is also located in the first cavity, and the circuit board 80 is housed in the second cavity. The rotor assembly includes a first rotor assembly 50 and a second rotor assembly 60, with the second rotor assembly 60 located in the first cavity 201. The first rotor assembly 50 includes a first rotor 51 and a second rotor 52. The first rotor 51 is sleeved on the outer periphery of the second rotor 52. The first rotor 51 includes multiple internal teeth, and the second rotor 52 includes multiple external teeth. A hydraulic cavity 2011 is formed between the internal teeth of the first rotor 51 and the external teeth of the second rotor 52. It can be understood that the hydraulic cavity 2011 is part of the pump cavity or that the hydraulic cavity is connected to the pump cavity. When the electric pump is working, the circuit board 80 can output a current that changes according to a predetermined pattern to the winding 42, thereby generating a changing excitation magnetic field in the stator assembly 40. The second rotor assembly 60 rotates under the action of the excitation magnetic field. The second rotor assembly 60 can directly or indirectly drive the first rotor assembly 50 to rotate. Specifically, the electric pump includes a pump shaft 70, which is drivenly connected to the second rotor 52 and also to the second rotor assembly 60. Therefore, when the second rotor assembly 60 rotates under the action of the excitation magnetic field, the pump shaft 70 can drive the second rotor 52 to rotate, thereby realizing the rotation of the first rotor assembly 50. As a result, the volume of the hydraulic chamber 2011 formed by the first rotor assembly 50 changes, or the pressure in the hydraulic chamber 2011 formed by the first rotor assembly 50 changes, allowing the working medium to enter and exit the hydraulic chamber 2011 formed by the first rotor assembly 50, thus enabling the working medium to flow.Specifically, the electric pump also includes an inlet and an outlet 104. The working medium can enter the hydraulic chamber 2011 through the inlet and leave the hydraulic chamber 2011 through the outlet. Due to the certain eccentricity between the first rotor 51 and the second rotor 52, when the second rotor 52 rotates, some of the external teeth of the second rotor 52 mesh with some of the internal teeth of the first rotor 51, thereby driving the first rotor 51 to rotate. During the rotation of the first rotor 51 and the second rotor 52, the volume of the hydraulic chamber 2011 changes. Specifically, when the first rotor assembly 50 rotates from the starting point to a certain angle, the volume of the hydraulic chamber 2011 gradually increases, thereby forming a partial vacuum. The working medium is then drawn into the hydraulic chamber 2011 from the inlet. As the first rotor 51 and the second rotor 52 continue to rotate, the volume of the hydraulic chamber 2011, which was originally filled with the working medium, gradually decreases. The working medium is compressed, thereby causing the working medium entering the hydraulic chamber 2011 to be forced out to the outlet, thus generating the flow power. The rotor assembly may also include a rotor core and a first rotor. The rotor core includes a base portion and a second protrusion portion. The second protrusion portion is disposed near the center of the base portion and is formed on the upper surface of the base portion. The second protrusion portion is fixedly disposed with the base portion. The first rotor is sleeved on the second protrusion portion. The upper surface of the base portion is adjacent to the lower surface of the first rotor. The second protrusion portion can drive the first rotor to rotate. At this time, the rotor assembly is located in the first cavity.

[0024] See Figures 1-3 The pump housing includes a first housing 30, a second housing 20, and a third housing 10. The second housing 20 and the third housing 10 are fixed relative to each other, and the second housing 20 and the first housing 30 are also fixed relative to each other. In the technical solution of this invention, the axial direction of the electric pump refers to the extension direction of the pump shaft 70, or in other words, the axial direction of the electric pump 1 is perpendicular to the rotation direction of the first rotor assembly 50. Please refer to [link / reference]. Figures 1 to 4The third housing 10 includes a main portion 11 and an extension portion 12. The extension portion 12 extends from the main portion 11 in the radial direction of the electric pump and in the axial direction of the electric pump. The height of the extension portion 12 is less than the height of the main portion 11. The extension portion 12 has at least two through holes for engaging with threaded holes in the second housing 20, thereby fastening the third housing 10 and the second housing 20 with screws. The third housing 10 also has an inlet and an outlet 104, a first connecting cavity 105, and a second connecting cavity 106. The first connecting cavity 105 is disposed between the inlet and the hydraulic cavity 2011. The first connecting cavity 105 is formed on the lower end face of the third housing 10 and is generally arc-shaped. The flow cross-sectional area of ​​the first connecting cavity 105 gradually increases from one end to the other end. The inlet is disposed corresponding to the end of the first connecting cavity 105 with a relatively larger flow cross-sectional area. The first connecting cavity 105 can communicate with the hydraulic cavity 2011. A second connecting cavity 106 is provided between the outlet 104 and the hydraulic chamber 2011. The outlet communicates with the second connecting cavity 106, which in turn communicates with the hydraulic chamber 2011. Specifically, the second connecting cavity 106 is also formed on the lower end face of the third housing 10. The flow cross-sectional area at the connection between the outlet and the second connecting cavity 106 is larger than the flow cross-sectional area of ​​other parts of the second connecting cavity 106. This arrangement facilitates the rapid discharge of the working medium entering the second connecting cavity 106 from the hydraulic chamber 2011. The second connecting cavity 106 and the first connecting cavity 105 are approximately circumferentially distributed in the third housing 10. This allows the entire circumference of the electric pump to be utilized, which helps to increase the working pressure of the working medium passing through the electric pump. The electric pump inlet includes a first inlet 101, a second inlet 102, and a third inlet 103. The first inlet 101 is connected to the second inlet 102, and the first inlet 101 is connected to the third inlet 103. The second inlet 102 is connected to the first connecting cavity 105, and the third inlet 103 is located near the center of the third housing 10. In one technical solution of the present invention, the third inlet 103 can be connected to the hydraulic cavity, or the second inlet 102 can be connected to the hydraulic cavity through the first connecting cavity 105. This relatively increases the inlet of the electric pump and also helps to reduce the weight of the third housing.

[0025] In one implementation, please refer to Figure 2 , Figure 3 and Figure 5The second housing 20 includes a first part 21 and a second part 22, which are integrally formed. The first part 21 and the second part 22 are arranged substantially perpendicularly, or in other words, the first part 22 extends from the inner wall of the first part along the radial direction of the electric pump. In this embodiment, the upper end face of the second part 22 is in direct or indirect contact with the lower end face of the third housing 10, and the lower end face of the second part 22 is in direct or indirect contact with the first housing 30. The first rotor assembly is located above the first part, and the second rotor assembly is located below the first part. Specifically, along the axial direction of the electric pump, the second rotor assembly 60 and the stator assembly 40 are spaced apart, and the second rotor assembly is located above the stator assembly 40, or in other words, the second rotor assembly 60 is adjacent to the first part 21 relative to the stator assembly 40.

[0026] Please see Figure 2 , Figure 3 , Figures 9-12 The stator assembly 40 includes a stator core 41, a winding frame, and at least one winding 42. The winding frame is made of insulating material to isolate the stator core 41 and the winding 42. The stator core 41 includes a base 411 and a first protrusion 413. The first protrusion 413 protrudes from the upper surface 401 of the base toward the second rotor assembly 60, wherein the upper surface 401 of the base faces the second rotor assembly 50, and the lower surface of the base 411 faces the circuit board 80. The base 411 and the first protrusion 413 can be separately provided and then fixed by welding, pressing, or riveting, or the first protrusion 413 and the base 411 can be integrally formed. In this embodiment, the stator core 41 includes six first protrusions 413, which are evenly distributed around the circumference of the base 411, and the distance from the first protrusion 413 to the center of the base 411 is approximately equal. The transverse cross-section of the first protrusion 413 can be circular, square, or triangular. The winding can form a winding through-hole, with at least a portion of the first protrusion located within at least a portion of the winding through-hole. Specifically, the winding 42 can be directly wound around the first protrusion, thereby forming a winding through-hole. In this case, the periphery of the first protrusion is coated with insulating material to isolate the first protrusion from the winding. The winding can be wound around a winding member, thereby forming a winding through-hole, and then the winding member is fitted onto the first protrusion. It can be understood that the winding is a collection of coils, and the winding generally has two openings. One opening of the winding 42 is oriented in approximately the same direction as the extension direction of the first protrusion. In one technical solution of the present invention, the base 411 can be a cylinder, wherein the height of the base 411 is relatively smaller than the diameter of the base 411. In the technical solution of the present invention, the vertical finger angle is between 85° and 95°, and the parallel finger angle is between -5° and 5°. In the technical solution of the present invention, the gap setting finger distance is less than or equal to 1 mm.

[0027] The electric pump includes a first support portion 412 located near the center of the base 411. The first support portion 412 provides support for the pump shaft 70 to improve its stability. This support includes the ability of the first support portion to radially restrict and / or axially restrict the pump shaft. See also... Figure 4 The electric pump also includes a second support portion 213. The first support portion 412 and the second support portion 213 are coaxially arranged. The first support portion 412 and the second support portion 213 simultaneously provide support for the pump shaft 70 to improve the stability of the pump shaft 70. For details, please refer to [link to relevant documentation]. Figure 2 and Figure 4 The first part has a second support part 213, which is located near the center of the first part. The second support part 213 extends through the upper and lower surfaces of the first part, and one end of the pump shaft is supported by the second support part 213.

[0028] In one technical solution of the present invention, please refer to Figure 7 and Figure 8 The base 411 includes a main body 4111. Along the radial direction of the electric pump, the main body 4111 is located inside the sidewall of the pump housing. The sidewall of the main body is disposed opposite to a portion of the sidewall of the pump housing. Here, the sidewall of the pump housing refers to the inner sidewall of the pump housing. Along the radial direction of the electric pump, the part closer to the center of the electric pump is considered "inner," and the part farther from the center of the electric pump is considered "outer." It can be seen that the first protrusion 413 extends from the upper surface of the main body towards the second rotor assembly 60. The main body 4111 includes a first recess 4114 formed in the sidewall of the main body 4111. The first recess 4114 is distributed circumferentially along the sidewall of the main body and is recessed relative to the sidewall of the main body along the radial direction of the electric pump. The electric pump includes a first seal 901 located in a first recess 4114. The first seal 901 abuts against the side wall of the pump housing, specifically against the side wall of the second housing 20 or the side wall of the first housing 30. It also abuts against the first recess, thus preventing communication between the first and second chambers. This prevents the working medium in the first chamber 201 from entering the second chamber, thereby preventing adverse effects on the circuit board, such as corrosion, and improving the service life of the electric pump. For another embodiment, please refer to... Figure 5 and Figure 15The pump housing includes a second recess, or in other words, the second housing or the first housing 30 includes a second recess. Taking the second housing 20 as an example, the second recess 214 is recessed relative to the side wall of the second housing along the radial direction of the electric pump. The second recess 214 is distributed circumferentially along the side wall of the second housing 20. Another first seal is located in the second recess 214, and the other first seal abuts against the side wall of the main body 4111, and of course, also abuts against the second recess, thereby achieving non-communication between the first cavity and the second cavity. To achieve relative fixation between the main body and the pump housing, at least a portion of the side wall of the main body is interference-fitted with the inner wall of the pump housing. Specifically, at least a portion of the side wall of the main body is interference-fitted with the side wall of the first housing or the side wall of the second housing 20.

[0029] In another implementation, please refer to Figure 5 The pump housing also includes a stepped portion, which provides support for the main body. Specifically, either the second housing or the first housing includes a stepped portion. Taking the second housing as an example, the second housing 20 includes a stepped portion 211, which includes a first stepped surface 2112 and a second stepped surface 2111. The first stepped surface 2112 and the second stepped surface 2111 intersect, specifically, the first stepped surface 2112 and the second stepped surface 2111 are arranged approximately perpendicularly. The sidewall of the second housing 20 includes the second stepped surface 2111, or in other words, the second stepped surface 2111 is part of the second sidewall. The first stepped surface is adjacent to the upper surface 401 of the main body. Here, "adjacent" includes direct contact or indirect contact. Please refer to [link to relevant documentation]. Figure 14The electric pump also includes a second seal 902, which is located between the first stepped surface 2112 and a portion of the upper surface of the main body. One side of the second seal abuts against the first stepped surface 2112, and the other side abuts against a portion of the upper surface 401 of the main body. The main body 4111 can be fixed to the electric pump in the following ways: the upper end of the first housing 30 is located inside the second housing, and the upper end face of the first housing 30 is adjacent to a portion of the lower surface of the main body, or in other words, the upper end face of the first housing directly or indirectly contacts a portion of the lower surface of the main body; or the circuit board includes a support (not shown), the upper end face of the support is adjacent to the lower surface of the main body, or in other words, the upper end face of the support directly or indirectly contacts the lower surface of the main body. Furthermore, the main body 4111 presses against the second seal 902, and the second seal 902 abuts against the first stepped surface and a portion of the upper surface of the main body, thus preventing communication between the first cavity and the second cavity. The stepped portion may also include a threaded hole. The threaded hole of the stepped portion has an opening on the first stepped surface. The main body 4111 has a through hole. The screw passes through the through hole of the main body and engages with the threaded hole of the stepped portion, thereby fixing the stator assembly 40 and the second housing 20. Of course, the first housing 30 may be provided with a stepped portion (not shown). The first stepped surface 2112 is adjacent to a portion of the lower surface of the main body. One side of the second seal 902 abuts against the second stepped surface, and the other side of the second seal 902 abuts against a portion of the lower surface of the main body. In this case, the circuit board is located in the cavity formed by the first housing. The stator assembly can be fixed to the first housing 30 in the following manner: the lower end of the second housing 20 is located inside the first housing 30, and the lower end face of the second housing 20 is adjacent to a portion of the upper surface 401 of the main body. In this way, when the first housing and the second housing are fixed, the stator assembly is also fixed to the first housing.

[0030] The electric pump includes a positioning part, which comprises a protrusion and a groove. The protrusion and groove are engaged to achieve radial positioning of the stator assembly 40. In one embodiment, please refer to... Figure 5 and Figure 7 The pump housing includes a protrusion 212. Taking the second housing 20 as an example, the protrusion 212 protrudes relative to the first stepped surface. A groove 4115 is provided in the main body 4111, and the groove 4115 is recessed relative to the side wall of the main body 4111. The groove 4115 forms an opening on the upper or lower surface of the main body. In another embodiment, a recess is provided in the second housing, and the recess is recessed relative to the first stepped surface. The protrusion 212 is provided in the main body, and the protrusion 212 protrudes relative to the upper surface of the main body. It can be understood that the protrusion 212 or the groove can also be provided in the first housing to cooperate with the main body 4111, which will not be described in detail here.

[0031] In another technical solution of the present invention, please refer to Figures 9-11The base 411 includes an outer edge portion 4112 and a main body portion 4111. The outer edge portion 4112 is integrally formed with the main body portion 4111. Along the radial direction of the electric pump, the outer edge portion 4112 protrudes from at least a portion of the sidewall of the main body portion 4111 in a direction away from the center of the main body portion 4111. The upper surface of the outer edge portion 4112 is adjacent to a portion of the lower end face of the second housing 20, and the lower surface of the outer edge portion 4112 is adjacent to a portion of the upper surface of the first housing 30. In other words, at least a portion of the outer edge portion 4112 is located between the second housing 20 and the first housing 30. The term "integrated" here refers to being integrally formed or fixed in one piece by welding, bonding, or other means. Further, please refer to... Figure 15 The electric pump includes a third seal 903. One third seal 903 is located between the upper surface of the outer edge 4112 and a portion of the lower end face of the second housing 20, with one side of the third seal 903 abutting against the upper surface of the outer edge 4112 and the other side abutting against a portion of the lower end face of the second housing 20; and / or another third seal 903 is located between the lower surface of the outer edge 4112 and the upper end face of the third housing 10, with one side of the other third seal 903 abutting against the lower surface of the outer edge 4112 and the other side abutting against the upper end face of the first housing 30. This ensures that the first chamber 201 and the second chamber 202 are not connected, and also prevents substances outside the pump housing from entering the first chamber and / or the second chamber. For another embodiment, please refer to... Figure 8 and Figure 9 The outer edge 4112 protrudes from a portion of the sidewall of the main body in a direction away from the center of the main body. At this time, the main body includes a first recess 4114. Along the radial direction of the electric pump, the first recess 4114 is recessed relative to another portion of the sidewall of the main body. The first recess is distributed circumferentially along the sidewall of the main body. A first seal 901 is located in the first recess and abuts against the sidewall of the first housing or the sidewall of the second housing 20. It can be known that the pump housing includes a second recess 214. Specifically, the first housing or the second housing is formed with a second recess. Along the radial direction of the electric pump, the second recess is recessed relative to the sidewall of the first housing or the second housing. The second recess is distributed circumferentially along the sidewall of the pump housing. Another first seal 901 is located in the second recess and abuts against another portion of the sidewall of the main body. This can enhance the sealing performance between the main body and the pump housing.

[0032] Please see Figure 12The stator assembly includes at least one connection terminal 414. In one embodiment, the connection terminal 414 includes a first end 4141, a second end 4142, and a main body 4143. The first end 4141, the second end 4142, and the main body 4143 are integrally disposed. The connection terminal 414 penetrates the upper and lower surfaces of the main body 4111. The base may include a through hole. The main body 4143 is inserted into the through hole of the base. The connection between the main body and the through hole of the base is sealed to prevent the formation of a channel communicating between the first cavity and the second cavity. The main body and the base are integrally injection molded. Specifically... The tight fit between the main body 4143 and the main body 4111 can be achieved as follows: the main body 4111 has a through hole, and the through hole of the main body 4143 and the main body 4111 is press-fitted or sealed with glue; at least a portion of the first end 4141 is located in the first cavity 201, and at least a portion of the second end 4142 is located in the second cavity 202. The first end 4141 is connected to the winding 42, and the second end 4142 is connected to the circuit board 80. The connection described herein includes signal connection and / or electrical connection. The winding can be directly or indirectly connected to the connection terminal, and the winding can be directly or indirectly connected to the circuit board. The connection between the first end 4141 and the winding 42, and the connection between the second end 4142 and the circuit board 80, can be achieved by crimping, gluing, welding, snap-fitting, or plugging. In another embodiment, the connecting terminal 414 includes a main body 4143 and a first end 4141. The corresponding circuit board 80 includes a first connector (not shown). One end of the main body 4143 is connected to the first connector of the circuit board 80, and the first end is connected to the winding. Alternatively, the connecting terminal 414 includes a main body 4143 and a second end 4142. The corresponding stator assembly includes a second connector (not shown). The second connector is connected to the winding, and the other end of the main body is connected to the winding 42 via the second connector. The second end 4142 is connected to the circuit board 80. Or, the connecting terminal 414 only includes the main body 4143, which extends into a through hole in the main body 4111. One end of the main body is connected to the winding via the second connector, and the other end is connected to the circuit board via the first connector. The connecting terminal can also be integrally formed with the winding wire, such as the winding wire passing through the main body, the winding wire being sealed and fixed to the main body, and the winding wire being connected to the circuit board. In addition, the stator assembly also includes an insulating component located between the through-hole and the main body to prevent electrical connection between the connection terminals and the base. The insulating component can be a separate component, insulating adhesive, or insulating varnish applied to the through-hole or the main body. The term "integrated installation" as used herein refers to a single integral molding or a method of fixing the components together by welding, bonding, or other means.

[0033] The first housing 30 and the second housing 20 can be fixed by means of insertion, snap-fit, or welding. The electric pump may also include a fastening device, which includes a bolt 1000 and a nut. The first housing includes a first through hole, and the second housing 20 includes a second through hole. In one embodiment, the bolt 1000 passes through the first and second through holes, and the nut fastens the bolt 1000. In another embodiment, the fastening device includes a bolt 1000, and the first or second through hole is provided with internal threads. The bolt 1000 fastens the first housing 30 and the second housing 20 with the internal threads of the first or second through hole. In yet another embodiment, such as... Figure 9 and Figure 15 The base 4111 includes a third through hole 4113, which penetrates the outer edge. A bolt 1000 passes through the first through hole, the second through hole, and the third through hole 4113, and a nut tightens the bolt 1000. Alternatively, the fastening device includes a bolt, and the first or second through hole is provided with an internal thread. The bolt 1000 tightens the third housing 10, the second housing 20, and the outer edge with the internal thread of the first or second through hole.

[0034] The first housing 30 is also formed with a heat dissipation part, which includes heat dissipation ribs. The heat dissipation ribs are integrally injection molded with the first housing 30. In this embodiment, as many heat dissipation ribs as possible are provided on the first housing 30 to increase the heat dissipation area, which is beneficial to the heat dissipation of the circuit board. In this embodiment, the transverse cross-sectional shape of the heat dissipation ribs is rectangular. Of course, the transverse cross-sectional shape of the heat dissipation ribs can also be other shapes, such as trapezoids, triangles, arcs and other shapes.

[0035] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. An electric pump, comprising a rotor assembly and a stator assembly, a gap being defined between the rotor assembly and the stator assembly in an axial direction of the electric pump, the rotor assembly being located above the stator assembly; the stator assembly comprising a stator core and at least one winding, the stator core comprising a base and at least one first protruding portion protruding from the base towards the rotor assembly, the winding being capable of forming a winding through hole, at least part of the first protruding portion being located in at least part of the winding through hole; the electric pump further comprising a circuit board and a pump housing, the pump housing being capable of forming a pump inner cavity, the pump inner cavity comprising a first cavity and a second cavity, the base being sealingly arranged at a connection between the base and the pump housing, the base relatively separating the first cavity and the second cavity, the first cavity and the second cavity being not in communication, the first cavity being located on one side of at least part of the base, the second cavity being located on the other side of at least part of the base, at least part of the rotor assembly and the first protruding portion being located in the first cavity, the circuit board being located in the second cavity; the stator assembly further comprising at least one connecting terminal, one end of the connecting terminal being connected with the winding, the other end of the connecting terminal being connected with the circuit board; the connecting terminal comprising a main portion, at least part of the main portion being sealingly arranged at a connection between the main portion and the base or at least part of the main portion being injection-molded and fixed with the base, the connecting terminal comprising a first end portion and a second end portion, the first end portion, the second end portion and the main portion being integrally arranged, the main portion being located between the first end portion and the second end portion, at least part of the first end portion being located in the first cavity, at least part of the second end portion being located in the second cavity, the first end portion being connected with the winding, the second end portion being connected with the circuit board.

2. The electric pump according to claim 1, characterized in that, the stator assembly comprising an insulating member, the insulating member being located between the main portion and a through hole of the base.

3. The electric pump according to claim 1, characterized in that, the base comprising a main body portion, a side wall of the main body portion being oppositely arranged with part of a side wall of the pump housing in a radial direction of the electric pump, the first protruding portion protruding from the main body portion towards the rotor assembly, the main portion being embedded in the main body portion; the electric pump comprising a first sealing member; the main body portion comprising a first recess portion, the first recess portion being recessed relative to the side wall of the main body portion in the radial direction of the electric pump, the first recess portion being distributed circumferentially along the side wall of the main body portion, the first sealing member being located in the first recess portion and abutting against the side wall of the pump housing; and / or, the pump housing comprising a second recess portion, the second recess portion being recessed relative to the side wall of the pump housing in the radial direction of the electric pump, the second recess portion being distributed circumferentially along the pump housing, the first sealing member being located in the second recess portion and abutting against the side wall of the main body portion.

4. The electric pump according to claim 2, characterized in that, the base comprising a main body portion, a side wall of the main body portion being oppositely arranged with part of a side wall of the pump housing in a radial direction of the electric pump, the first protruding portion protruding from the main body portion towards the rotor assembly, the main portion being embedded in the main body portion; the electric pump comprising a first sealing member; The main body part comprises a first recess, which is recessed relative to the side wall of the main body part along the radial direction of the electric pump, and which is distributed circumferentially along the side wall of the main body part; the first seal is located in the first recess and abuts against the side wall of the pump shell; And / or, the pump shell comprises a second recess, which is recessed relative to the side wall of the pump shell along the radial direction of the electric pump, and which is distributed circumferentially along the side wall of the pump shell; the first seal is located in the second recess and abuts against the side wall of the main body part.

5. The electric pump according to claim 3, characterized in that, The pump shell comprises a first shell and a second shell, at least part of the first shell is located below at least part of the second shell, and the first shell and the second shell are relatively fixed; At least part of the side wall of the main body part is in interference fit with the side wall of the first shell, or at least part of the side wall of the main body part is in interference fit with the side wall of the second shell.

6. The electric pump of claim 4, wherein The pump shell comprises a first shell and a second shell, at least part of the first shell is located below at least part of the second shell, and the first shell and the second shell are relatively fixed; At least part of the side wall of the main body part is in interference fit with the side wall of the first shell, or at least part of the side wall of the main body part is in interference fit with the side wall of the second shell.

7. The electric pump of claim 1, wherein The base part comprises a main body part, the side wall of which is arranged opposite to part of the side wall of the pump shell along the radial direction of the electric pump; the first protruding part extends from the main body part towards the rotor assembly, and the base part is embedded in the main body part; the pump shell comprises a first shell and a second shell, at least part of the first shell is located below at least part of the second shell, and the first shell and the second shell are relatively fixed; The pump shell comprises a step part having a first step surface and a second step surface, and the first step surface intersects with the second step surface; the electric pump comprises a first seal; the side wall of the main body part is shaped with a first recess, the first seal is located in the first recess and abuts against the second step surface; and / or, the second step surface is shaped with a second recess, the first seal is located in the second recess and abuts against the side wall of the main body part; The step part is formed in the first shell, the side wall of the first shell comprises the second step surface, the first step surface is adjacent to part of the lower surface of the main body part, and the circuit board is located in the inner cavity formed by the first shell; or the step part is formed in the second shell, the side wall of the second shell comprises the second step surface, and the first step surface is adjacent to part of the upper surface of the main body part.

8. The electric pump of claim 2, wherein The base part comprises a main body part, the side wall of which is arranged opposite to part of the side wall of the pump shell along the radial direction of the electric pump; the first protruding part extends from the main body part towards the rotor assembly, and the base part is embedded in the main body part; the pump shell comprises a first shell and a second shell, at least part of the first shell is located below at least part of the second shell, and the first shell and the second shell are relatively fixed; The pump housing comprises a stepped portion, the stepped portion has a first stepped surface and a second stepped surface, the first stepped surface intersects with the second stepped surface; the electric pump comprises a first sealing element; a side wall of the main body portion is shaped with a first recess, the first sealing element is located in the first recess and abuts against the second stepped surface; and / or the second stepped surface is shaped with a second recess, the first sealing element is located in the second recess and abuts against the side wall of the main body portion; The stepped portion is shaped in the first housing, a side wall of the first housing comprises the second stepped surface, the first stepped surface is adjacent to a part of the lower surface of the main body portion, and the circuit board is located in an inner cavity formed by the first housing; or the stepped portion is shaped in the second housing, a side wall of the second housing comprises the second stepped surface, the first stepped surface is adjacent to a part of the upper surface of the main body portion.

9. The electric pump according to claim 7, characterized in that, The electric pump comprises a second sealing element; The stepped portion is shaped in the first housing, one side of the second sealing element abuts against the first stepped surface, the other side of the second sealing element abuts against a part of the lower surface of the main body portion, the lower end portion of the second housing is located inside the first housing, and the lower end surface of the second housing is adjacent to a part of the upper surface of the main body portion; Or, the stepped portion is shaped in the second housing, one side of the second sealing element abuts against the first stepped surface, the other side of the second sealing element abuts against a part of the upper surface of the main body portion; the upper end portion of the first housing is located inside the second housing, and the upper end surface of the first housing is adjacent to a part of the lower surface of the main body portion; or the circuit board has a support element, and an upper end surface of the support element is adjacent to the lower surface of the main body portion.

10. The electric pump of claim 8, wherein, The electric pump comprises a second sealing element; The stepped portion is shaped in the first housing, one side of the second sealing element abuts against the first stepped surface, the other side of the second sealing element abuts against a part of the lower surface of the main body portion, the lower end portion of the second housing is located inside the first housing, and the lower end surface of the second housing is adjacent to a part of the upper surface of the main body portion; Or, the stepped portion is shaped in the second housing, one side of the second sealing element abuts against the first stepped surface, the other side of the second sealing element abuts against a part of the upper surface of the main body portion; the upper end portion of the first housing is located inside the second housing, and the upper end surface of the first housing is adjacent to a part of the lower surface of the main body portion; or the circuit board has a support element, and an upper end surface of the support element is adjacent to the lower surface of the main body portion.

11. The electric pump of claim 7, wherein, The electric pump comprises a positioning portion, the positioning portion comprises a groove and a protrusion, and the protrusion is arranged in cooperation with the groove; The groove is arranged on the main body portion, the groove is recessed relative to the side wall of the main body portion, the groove has an opening on the upper surface or the lower surface of the main body portion, and the protrusion is arranged on the second housing or the first housing, and the protrusion is protruded relative to the first stepped surface; Or the groove is arranged on the second shell or the first shell, the groove is recessed relative to the first step surface, the convex part is arranged on the main body part, and the convex part is protruded relative to the upper surface or the lower surface of the main body part.

12. The electric pump of claim 8, wherein, The electric pump comprises a positioning part, the positioning part comprises a groove and a convex part, and the convex part is arranged in cooperation with the groove. The groove is arranged on the main body part, the groove is recessed relative to the sidewall of the main body part, the groove has an opening on the upper surface or the lower surface of the main body part, the convex part is arranged on the second shell or the first shell, and the convex part is protruded relative to the first step surface. Or the groove is arranged on the second shell or the first shell, the groove is recessed relative to the first step surface, the convex part is arranged on the main body part, and the convex part is protruded relative to the upper surface or the lower surface of the main body part.

13. The electric pump of claim 9, wherein, The electric pump comprises a positioning part, the positioning part comprises a groove and a convex part, and the convex part is arranged in cooperation with the groove. The groove is arranged on the main body part, the groove is recessed relative to the sidewall of the main body part, the groove has an opening on the upper surface or the lower surface of the main body part, the convex part is arranged on the second shell or the first shell, and the convex part is protruded relative to the first step surface. Or the groove is arranged on the second shell or the first shell, the groove is recessed relative to the first step surface, the convex part is arranged on the main body part, and the convex part is protruded relative to the upper surface or the lower surface of the main body part.

14. The electric pump of claim 10, wherein, The electric pump comprises a positioning part, the positioning part comprises a groove and a convex part, and the convex part is arranged in cooperation with the groove. The groove is arranged on the main body part, the groove is recessed relative to the sidewall of the main body part, the groove has an opening on the upper surface or the lower surface of the main body part, the convex part is arranged on the second shell or the first shell, and the convex part is protruded relative to the first step surface. Or the groove is arranged on the second shell or the first shell, the groove is recessed relative to the first step surface, the convex part is arranged on the main body part, and the convex part is protruded relative to the upper surface or the lower surface of the main body part.

15. The electric pump of claim 1, wherein, The pump shell comprises a first shell and a second shell, at least part of the first shell is located below at least part of the second shell, and the circuit board is located in a cavity formed by the first shell. The base comprises an outer edge part and a main body part, the outer edge part is arranged integrally with the main body part, in the radial direction of the electric pump, the outer edge part is protruded from at least part of the sidewall of the main body part to the direction away from the center of the main body part, the upper surface of the outer edge part is adjacent to part of the lower end surface of the second shell, and the lower surface of the outer edge part is adjacent to part of the upper surface of the first shell.

16. The electric pump of claim 2, wherein The pump shell comprises a first shell and a second shell, at least part of the first shell is located below at least part of the second shell, and the circuit board is located in a cavity formed by the first shell. The base includes an outer edge portion and a main body portion, the outer edge portion is integrally arranged with the main body portion, in the radial direction of the electric pump, the outer edge portion protrudes from at least part of the side wall of the main body portion to a direction away from the center of the main body portion, the upper surface of the outer edge portion is adjacent to part of the lower end surface of the second shell, and the lower surface of the outer edge portion is adjacent to part of the upper surface of the first shell.

17. The electric pump of claim 15, wherein, The electric pump includes a third seal, one of the third seals is arranged between the upper surface of the outer edge portion and part of the lower end surface of the second shell, one side of the third seal abuts the upper surface of the outer edge portion, and the other side of the third seal abuts part of the lower end surface of the second shell; and / or another third seal is arranged between the lower surface of the outer edge portion and part of the upper end surface of the first shell, one side of the third seal abuts the lower surface of the outer edge portion, and the other side of the third seal abuts the upper end surface of the first shell.

18. The electric pump of claim 16, wherein, The electric pump includes a third seal, one of the third seals is arranged between the upper surface of the outer edge portion and part of the lower end surface of the second shell, one side of the third seal abuts the upper surface of the outer edge portion, and the other side of the third seal abuts part of the lower end surface of the second shell; and / or another third seal is arranged between the lower surface of the outer edge portion and part of the upper end surface of the first shell, one side of the third seal abuts the lower surface of the outer edge portion, and the other side of the third seal abuts the upper end surface of the first shell.

19. The electric pump of claim 15, wherein, The electric pump includes a first seal, the outer edge portion protrudes from part of the side wall of the main body portion to a direction away from the center of the main body portion; The main body portion is formed with a first recess, in the radial direction of the electric pump, the first recess is recessed relative to another part of the side wall of the main body portion, the first recess is distributed circumferentially along the side wall of the main body portion, and one of the first seals is located in the first recess and abuts the side wall of the first shell or the side wall of the second shell; And / or, the first shell or the second shell is formed with a second recess, in the radial direction of the electric pump, the second recess is recessed relative to the side wall of the first shell or the second shell, the second recess is distributed circumferentially along the side wall of the pump shell, and another of the first seals is located in the second recess and abuts another part of the side wall of the main body portion.

20. The electric pump of claim 16, wherein, The electric pump includes a first seal, the outer edge portion protrudes from part of the side wall of the main body portion to a direction away from the center of the main body portion; The main body portion is formed with a first recess, in the radial direction of the electric pump, the first recess is recessed relative to another part of the side wall of the main body portion, the first recess is distributed circumferentially along the side wall of the main body portion, and one of the first seals is located in the first recess and abuts the side wall of the first shell or the side wall of the second shell; And / or, the first shell or the second shell is shaped with a second recess, which is recessed relative to a side wall of the first shell or the second shell in a radial direction of the electric pump, and which is distributed circumferentially along the side wall of the pump shell, and another one of the first seals is located in the second recess and abuts against another part of the side wall of the main body.

21. The electric pump of claim 17, wherein, The electric pump comprises a first seal, and the outer edge portion is protruded from a part of the side wall of the main body in a direction away from the center of the main body. The main body is shaped with a first recess, which is recessed relative to another part of the side wall of the main body in a radial direction of the electric pump, and which is distributed circumferentially along the side wall of the main body, and one of the first seals is located in the first recess and abuts against the side wall of the first shell or the side wall of the second shell. And / or, the first shell or the second shell is shaped with a second recess, which is recessed relative to a side wall of the first shell or the second shell in a radial direction of the electric pump, and which is distributed circumferentially along the side wall of the pump shell, and another one of the first seals is located in the second recess and abuts against another part of the side wall of the main body.

22. The electric pump of claim 18, wherein, The electric pump comprises a first seal, and the outer edge portion is protruded from a part of the side wall of the main body in a direction away from the center of the main body. The main body is shaped with a first recess, which is recessed relative to another part of the side wall of the main body in a radial direction of the electric pump, and which is distributed circumferentially along the side wall of the main body, and one of the first seals is located in the first recess and abuts against the side wall of the first shell or the side wall of the second shell. And / or, the first shell or the second shell is shaped with a second recess, which is recessed relative to a side wall of the first shell or the second shell in a radial direction of the electric pump, and which is distributed circumferentially along the side wall of the pump shell, and another one of the first seals is located in the second recess and abuts against another part of the side wall of the main body.

23. The electric pump of claim 5, wherein, The electric pump comprises a fastening device, the fastening device comprises a bolt and a nut, the first shell comprises a first through hole, and the second shell comprises a second through hole; the bolt passes through the first through hole and the second through hole, and the nut fastens the bolt; or the fastening device comprises a bolt, and the first through hole or the second through hole is provided with an internal thread, and the bolt fastens the first shell and the second shell with the internal thread of the first through hole or the second through hole.

24. The electric pump of claim 6, wherein, The electric pump comprises a fastening device, the fastening device comprises a bolt and a nut, the first shell comprises a first through hole, and the second shell comprises a second through hole; the bolt passes through the first through hole and the second through hole, and the nut fastens the bolt; or the fastening device comprises a bolt, and the first through hole or the second through hole is provided with an internal thread, and the bolt fastens the first shell and the second shell with the internal thread of the first through hole or the second through hole.

25. The electric pump of claim 11, wherein, The electric pump includes a fastening device, the fastening device includes a bolt and a nut, the first shell includes a first through hole, the second shell includes a second through hole; the bolt passes through the first through hole and the second through hole, and the nut fastens the bolt; or the fastening device includes a bolt, and the first through hole or the second through hole is provided with an internal thread, and the bolt fastens the first shell and the second shell with the internal thread of the first through hole or the second through hole.

26. The electric pump of claim 12, wherein, The electric pump includes a fastening device, the fastening device includes a bolt and a nut, the first shell includes a first through hole, the second shell includes a second through hole; the bolt passes through the first through hole and the second through hole, and the nut fastens the bolt; or the fastening device includes a bolt, and the first through hole or the second through hole is provided with an internal thread, and the bolt fastens the first shell and the second shell with the internal thread of the first through hole or the second through hole.

27. The electric pump of claim 13, wherein, The electric pump includes a fastening device, the fastening device includes a bolt and a nut, the first shell includes a first through hole, the second shell includes a second through hole; the bolt passes through the first through hole and the second through hole, and the nut fastens the bolt; or the fastening device includes a bolt, and the first through hole or the second through hole is provided with an internal thread, and the bolt fastens the first shell and the second shell with the internal thread of the first through hole or the second through hole.

28. The electric pump of claim 14, wherein, The electric pump includes a fastening device, the fastening device includes a bolt and a nut, the first shell includes a first through hole, the second shell includes a second through hole; the bolt passes through the first through hole and the second through hole, and the nut fastens the bolt; or the fastening device includes a bolt, and the first through hole or the second through hole is provided with an internal thread, and the bolt fastens the first shell and the second shell with the internal thread of the first through hole or the second through hole.

29. The electric pump of claim 19, wherein, The electric pump includes a fastening device, the fastening device includes a bolt and a nut, the first shell includes a first through hole, the second shell includes a second through hole; the bolt passes through the first through hole and the second through hole, and the nut fastens the bolt; or the fastening device includes a bolt, and the first through hole or the second through hole is provided with an internal thread, and the bolt fastens the first shell and the second shell with the internal thread of the first through hole or the second through hole.

30. The electric pump of claim 20, wherein, The electric pump includes a fastening device, the fastening device includes a bolt and a nut, the first shell includes a first through hole, the second shell includes a second through hole; the bolt passes through the first through hole and the second through hole, and the nut fastens the bolt; or the fastening device includes a bolt, and the first through hole or the second through hole is provided with an internal thread, and the bolt fastens the first shell and the second shell with the internal thread of the first through hole or the second through hole. The electric pump includes a fastening device, the fastening device includes a bolt and a nut, the first shell includes a first through hole, the second shell includes a second through hole; the bolt passes through the first through hole and the second through hole, and the nut fastens the bolt; or the fastening device includes a bolt, and the first through hole or the second through hole is provided with an internal thread, and the bolt fastens the first shell and the second shell with the internal thread of the first through hole or the second through hole. The electric pump includes a fastening device, the fastening device includes a bolt and a nut, the first shell includes a first through hole, the second shell includes a second through hole; the bolt passes through the first through hole and the second through hole, and the nut fastens the bolt; or the fastening device includes a bolt, and the first through hole or the second through hole is provided with an internal thread, and the bolt fastens the first shell and the second shell with the internal thread of the first through hole or the second through hole.

31. The electric pump of claim 21, wherein, The electric pump comprises a fastening device, the fastening device comprises a bolt and a nut, the first shell comprises a first through hole, the second shell comprises a second through hole; the base comprises a third through hole, the third through hole penetrates the outer edge part, the bolt passes through the first through hole, the second through hole and the third through hole, and the nut fastens the bolt; or the fastening device comprises a bolt, the first through hole or the second through hole is provided with an internal thread, and the bolt fastens the first shell, the second shell and the outer edge part with the internal thread of the first through hole or the second through hole.

32. The electric pump of claim 22, wherein, The electric pump comprises a fastening device, the fastening device comprises a bolt and a nut, the first shell comprises a first through hole, the second shell comprises a second through hole; the base comprises a third through hole, the third through hole penetrates the outer edge part, the bolt passes through the first through hole, the second through hole and the third through hole, and the nut fastens the bolt; or the fastening device comprises a bolt, the first through hole or the second through hole is provided with an internal thread, and the bolt fastens the first shell, the second shell and the outer edge part with the internal thread of the first through hole or the second through hole.

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