Electric pump

Abstract

An electric pump comprises a stator assembly, the stator assembly comprises a stator core and a winding, the winding comprises a main body section, a first section and a second section, the main body section connects the first section and the second section; the stator core comprises a core tooth part, a core yoke part and a core neck part, the core yoke part is located at the outer periphery of the winding; a first reference plane is defined, the first reference plane coincides with the axial center axis of the core tooth part and the axial center axis of the core neck part, a section of the stator assembly is made along the first reference plane, the upper end of the section of the main body section is flush with the upper end of the section of the core yoke part body part, the lower end of the section of the main body section is flush with the lower end of the section of the core yoke part body part; the electric pump further comprises a shielding piece, the material of the shielding piece is a conductive metal material, at least part of the shielding piece is located at the outer periphery of at least one of the first section and the second section; thus it is beneficial to reduce the electromagnetic waves radiated to the outside, thereby it is beneficial to reduce the interference of the electric pump to the outside.

Description

Technical Field

[0001] The present application relates to a fluid pump, and in particular to an electric pump. Background Art

[0002] An electric pump includes a stator assembly. Typically, when the electric pump is in use, the windings in the stator assembly are energized, which then generates electromagnetic waves. These electromagnetic waves may interfere with other external components, and thus may affect the performance of other external components. Therefore, how to reduce the interference of the electric pump to the outside world is a technical issue that needs to be considered. Summary of the Invention

[0003] The purpose of this application is to provide an electric pump that is conducive to reducing external interference caused by the electric pump.

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

[0005] An electric pump includes a stator assembly, the stator assembly includes a stator core and a winding, the winding includes a main section, a first section and a second section, the main section connects the first section and the second section, the first section is located above the second section; the stator core includes a core tooth portion, a core yoke portion and a core neck portion, the core neck portion connects the core tooth portion and the core yoke portion, the core yoke portion is farther from the central axis of the stator core than the core tooth portion, the core yoke portion is located on the periphery of the winding, and the core neck portion can provide support for the winding of the winding support; define a first reference plane, the first reference plane coincides with the axial center axis of the core tooth portion and the axial center axis of the core neck, and the stator assembly is cross-sectioned along the first reference plane, the core yoke portion includes a main body portion, the upper end of the main body section cross-section is flush with the upper end of the main body section cross-section, and the lower end of the main body section cross-section is flush with the lower end of the main body section cross-section; the electric pump also includes a shielding member, the material of the shielding member is a conductive metal material, and at least a portion of the shielding member is located on the periphery of at least one of the first segment and the second segment.

[0006] In the technical solution provided in the present application, the electric pump also includes a shielding member, the material of the shielding member is a conductive metal material, and at least a portion of the shielding member is located on the periphery of at least one of the first section and the second section; through the above method, when the electric pump is in use, the shielding member can absorb and reflect the electromagnetic waves generated by the winding, which is beneficial to reducing the electromagnetic waves radiated to the outside by the first section and / or the second section of the winding, thereby helping to reduce the interference of the electric pump to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1This is a schematic cross-sectional view of the first embodiment of the electric pump of the present application;

[0008] Figure 2 yes Figure 1 An enlarged structural diagram of the middle A part;

[0009] Figure 3 yes Figure 1 A schematic diagram of a three-dimensional structure in which the middle stator assembly, the shielding member, the first elastic pad and the second elastic pad are assembled together;

[0010] Figure 4 yes Figure 1 A schematic diagram of a three-dimensional structure of the stator assembly in one direction;

[0011] Figure 5 yes Figure 1 A schematic diagram of a three-dimensional structure of the middle stator assembly in another direction;

[0012] Figure 6 yes Figure 4 or Figure 5 A schematic diagram of a three-dimensional structure of the middle insulating frame in one direction;

[0013] Figure 7 yes Figure 4 or Figure 5 A schematic diagram of a three-dimensional structure of the middle insulating frame in another direction;

[0014] Figure 8 yes Figure 1 or Figure 3 A schematic diagram of a three-dimensional structure in one direction in which the middle shielding member, the first elastic pad and the second elastic pad are assembled together;

[0015] Figure 9 yes Figure 1 or Figure 3 A schematic diagram of a three-dimensional structure in another direction in which the middle shielding member, the first elastic pad and the second elastic pad are assembled together;

[0016] Figure 10 yes Figure 8 or Figure 9 A schematic front view of the structure of the middle shielding member, the first elastic pad and the second elastic pad assembled together;

[0017] Figure 11 yes Figure 10 A schematic cross-sectional structure diagram of the middle shielding member, the first elastic pad and the second elastic pad assembled together along section AA;

[0018] Figure 12 yes Figure 11 An enlarged structural diagram of the middle A part;

[0019] Figure 13 yes Figure 8 or Figure 9 A schematic diagram of a three-dimensional structure of the middle shielding member in one direction;

[0020] Figure 14 yes Figure 8 or Figure 9 A schematic diagram of a three-dimensional structure of the middle shielding member in another direction;

[0021] Figure 15 This is a schematic cross-sectional view of a second embodiment of the electric pump of the present application;

[0022] Figure 16 yes Figure 15 An enlarged structural diagram of the middle B part;

[0023] Figure 17 yes Figure 15 A schematic diagram of a three-dimensional structure in which the middle stator assembly, the shielding member, the first elastic pad and the second elastic pad are assembled together;

[0024] Figure 18 yes Figure 15 A schematic diagram of a three-dimensional structure in one direction in which the middle shielding member, the first elastic pad and the second elastic pad are assembled together;

[0025] Figure 19 yes Figure 15 A schematic diagram of a three-dimensional structure in another direction in which the middle shielding member, the first elastic pad and the second elastic pad are assembled together;

[0026] Figure 20 yes Figure 18 or Figure 19 A schematic diagram of a three-dimensional structure of the middle shielding member in one direction;

[0027] Figure 21 yes Figure 18 or Figure 19 A schematic diagram of a three-dimensional structure of the middle shielding member in another direction;

[0028] Figure 22 1 is a schematic cross-sectional view of a third embodiment of the electric pump of the present application;

[0029] Figure 23 yes Figure 22 An enlarged structural diagram of the middle C section;

[0030] Figure 24 yes Figure 22 A schematic diagram of a three-dimensional structure in which the first shielding member, the second shielding member and the stator assembly are assembled together;

[0031] Figure 25 1 is a schematic cross-sectional view of a fourth embodiment of the electric pump of the present application;

[0032] Figure 26 yes Figure 25 An enlarged structural diagram of the middle A part;

[0033] Figure 27 yes Figure 25 A schematic diagram of a three-dimensional structure in which the first shell and the shielding member are assembled together;

[0034] Figure 28 yes Figure 26 or Figure 27 A schematic diagram of a three-dimensional structure of the shielding component;

[0035] Figure 29 yes Figure 26 or Figure 27 A schematic diagram of a three-dimensional structure of the first shell;

[0036] Figure 30a yes Figure 29 An enlarged structural diagram of the middle A part;

[0037] Figure 30b yes Figure 29 A schematic diagram of a three-dimensional cross-sectional structure of the middle portion of the first shell;

[0038] Figure 31 is a schematic cross-sectional view of a fifth embodiment of the electric pump of the present application;

[0039] Figure 32 yes Figure 31 An enlarged structural diagram of the middle A part;

[0040] Figure 33 yes Figure 31 A schematic diagram of a three-dimensional structure in which the first shell and the shielding member are assembled together;

[0041] Figure 34 yes Figure 31 A schematic diagram of a three-dimensional structure of the first shell;

[0042] Figure 35 yes Figure 34 A front view structural diagram of the first shell;

[0043] Figure 36 yes Figure 35 A schematic diagram of a three-dimensional cross-sectional structure of the first shell along section AA;

[0044] Figure 37 yes Figure 31 or Figure 33 A schematic diagram of a three-dimensional structure of the shielding component;

[0045] Figure 38 yes Figure 34 A three-dimensional structural diagram of the raised rib;

[0046] Figure 39 is a schematic cross-sectional view of a sixth embodiment of the electric pump of the present application;

[0047] Figure 40 yes Figure 39 A schematic diagram of a three-dimensional structure in which the first shielding member, the second shielding member and the first shell are assembled together. DETAILED DESCRIPTION

[0048] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0049] The electric pump in the following embodiments can provide flow power for the working medium of the vehicle thermal management system. The working medium can include a 50% ethylene glycol aqueous solution or clean water. Of course, the working medium can also be other components. The electric pump in this application will be described in detail below. It should be noted that for ease of description, the directional terms such as "upper", "lower", "high", "low", "top", and "bottom" mentioned below are based on the components of the electric pump that are not cut into sections. Figure 1 The position shown is the reference when it is installed.

[0050] See also Figure 1 The electric pump 100 includes a pump housing, a rotor assembly 1, a stator assembly 2, a pump shaft 3 and an isolation portion 4. The rotor assembly 1 is sleeved on the outer periphery of the pump shaft 3. The electric pump 100 includes a pump inner cavity. The isolation portion 4 separates the pump inner cavity into a first cavity 80 and a second cavity 90. The first cavity 80 can have a working medium flowing through it, and the second cavity 90 is not in direct contact with the working medium. The rotor assembly 1 is located in the first cavity 80, and the stator assembly 2 is located in the second cavity 90. Figure 1 and Figure 3 The stator assembly 2 includes a stator core 21, an insulating frame 23 and a winding 22. The insulating frame 23 covers at least a portion of the surface of the stator core 21. A portion of the insulating frame 23 is spaced between the winding 22 and the stator core 21. In this way, the insulating frame 23 can be set between the winding 22 and the stator core 21 to prevent electrical conduction between the stator core 21 and the winding 22. When the electric pump 100 is working, the excitation magnetic field generated by the stator assembly 2 is controlled by controlling the current passing through the winding 22 of the stator assembly 2. Under the action of the excitation magnetic field, the rotor assembly 1 rotates around the pump shaft 3 or along with the pump shaft 3.

[0051] See also Figure 1The winding 22 includes a main section 221, a first section 222 and a second section 223. The main section 221 connects the first section 222 and the second section 223. The first section 222 is located above the second section 223. Figure 1 and Figure 4 The stator core 21 includes a core tooth portion 212, a core yoke portion 213 and a core neck portion 214. The core neck portion 214 connects the core tooth portion 212 and the core yoke portion 213. Along the radial direction of the stator core 21, the core yoke portion 213 is farther from the central axis of the stator core 21 than the core tooth portion 212. The core yoke portion 213 is located on the periphery of the winding 22. A first reference plane is defined. The first reference plane coincides with the axial central axis L1 of the core tooth portion and the axial central axis L2 of the core neck portion. A cross section is made on the stator assembly along the first reference plane. The upper end of the cross section of the main section 221 is aligned with the core yoke portion 213. 13, the upper end of the cross section of the main body is flush, and the lower end of the cross section of the main body section 221 is flush with the lower end of the cross section of the main body section 213. This arrangement enables the core yoke 213 to absorb and reflect the electromagnetic waves radiated by the winding of the main body section 221 toward the core yoke 213, which is beneficial to reduce the electromagnetic waves radiated to the outside by the winding of the main body section 221, thereby helping to reduce the interference of the electric pump to the outside; the main body of the above core yoke 213 can be seen in the introduction below; for the sake of convenience of description, the winding 22 is divided into the above three sections, and in fact the winding 22 is formed by winding at least one enameled wire.

[0052] See also Figure 6 and Figure 7 The insulating frame 23 includes a first stopper 231, a second stopper 232 and a winding portion 235. The first stopper 231, the stator core 21 and the second stopper 232 are distributed along the axial direction of the electric pump 100. The winding portion 235 can provide support for the winding of the winding 22. The winding portion 235 is closer to the central axis of the stator assembly 2 than the first stopper 231 and the second stopper 232. The upper end surface of the first stopper 231 is higher than the top of the winding portion 235, and the lower end surface of the second stopper 232 is lower than The bottom of the winding portion 235; in this way, when the winding is wound, it is helpful to prevent the winding from being separated from the winding portion 235 from the side where the first stop portion 231 and the second stop portion 232 are located; in this embodiment, the stator core 21 is located between the first stop portion 231 and the second stop portion 232, the first stop portion 231 is located on one side of the stator core 21, and the second stop portion 232 is located on one side of the stator core 21, and the side where the first stop portion 231 is located and the side where the second stop portion 232 is located are different sides of the stator core 21; see Figures 3 to 5 The outer circumference of the stator core 21 is completely exposed. Of course, the first stopper 231 and the second stopper 232 may also partially cover the outer circumference of the stator core 21. In this case, only a portion of the outer circumference of the stator core 21 is exposed, or the outer circumference of the stator core 21 is completely covered by the first stopper 231 and / or the second stopper 232; see Figure 6 and Figure 7 The insulating frame 23 also includes a third stopper 233 and a fourth stopper 234. The top of the winding portion 235 is connected to the first stopper 231 and the third stopper 233, and the bottom of the winding portion 235 is connected to the second stopper 232 and the fourth stopper 234. The side of the third stopper 233 is the same side as the side of the first stopper 231, and the side of the fourth stopper 234 is the same side as the side of the second stopper 232. The third stopper 233 and the fourth stopper 234 are closer to the central axis of the stator assembly 2 than the winding portion 235. The upper end surface of the third stopper 233 is higher than the top of the winding portion 235, and the lower end surface of the fourth stopper 234 is lower than the bottom of the winding portion 235. In this way, when the winding is wound, it is helpful to prevent the winding from separating from the winding portion 235 from the side where the third stopper 233 and the fourth stopper 234 are located.

[0053] See also Figure 1 and Figure 2 , Figure 1 and Figure 2 This is a structural schematic diagram of the first embodiment of the electric pump in this application; the first embodiment of the electric pump will be introduced in detail below.

[0054] See also Figures 1 to 7 The electric pump 100 further includes a shielding member 5, which is made of a conductive metal material. In this embodiment, the shielding member 5 is annular, and at least part of the shielding member 5 is located on the periphery of the first section 222 of the winding 22; in the above manner, when the electric pump is in use, the shielding member 5 located on the periphery of the first section 222 can absorb and reflect the electromagnetic waves generated by the winding of the first section 222, which is beneficial to reducing the electromagnetic waves radiated to the outside by the winding of the first section 222, thereby helping to reduce the interference of the electric pump to the outside; the shielding member mentioned above will be introduced in detail below.

[0055] See also Figures 13 and 14 In this embodiment, the shielding member 5 includes a cylinder 51 and a cover 52, and the cylinder 51 is connected to the cover 52. In this embodiment, the cylinder 51 and the cover 52 are processed into an integral structure. Of course, the cylinder 51 and the cover 52 can also be a separate structure, that is, the cylinder 51 and the cover 52 are processed separately and then connected together by welding or detachable connection or limit connection; refer to Figures 1 to 14 In this embodiment, the barrel 51 is arranged around the outer periphery of the first section 222. Specifically, the barrel 51 is arranged around the outer periphery of the first stopper 231. Of course, the barrel 51 can also be embedded in the first stopper 231. Through the above-mentioned method, the barrel 51 can absorb and reflect the electromagnetic waves radiated toward the barrel 51, thereby helping to reduce the electromagnetic waves radiated to the outside of the barrel 51, thereby helping to reduce the interference of the electric pump to the outside; specifically, see Figures 1 to 7In this embodiment, the height of the barrel 51 is greater than the height of the first stop 231, and the bottom surface 5101 of the barrel 51 is lower than the upper end surface 2110 of the stator core. The first stop 231 and the winding of the first section 222 are located in the barrel 51. In this way, along the axial direction of the insulating frame 23, the barrel 51 can surround the first stop 231 and the first section 222 of the winding, which is beneficial for the barrel 51 to absorb and reflect more electromagnetic waves radiated toward the barrel 51 by the winding located on the inner periphery of the first stop 231.

[0056] See also Figures 1 to 6 In this embodiment, the cover 52 covers the top 2221 of the first section 222 of the winding 22 and the end surface 2311 of the first stop portion 231; in this way, the cover 52 can absorb and reflect the electromagnetic waves radiated by the winding toward the cover side, thereby helping to reduce the electromagnetic waves generated by the winding from radiating upward, and further helping to reduce the electromagnetic waves radiated by the winding to the outside, thereby helping to reduce the interference of the electric pump to the outside.

[0057] See also Figure 13 and Figure 14 The cover portion 52 includes a first surface 521 and a second surface 522. The second surface 522 is closer to the winding 22 than the first surface 521. The first surface 521 and the second surface 522 are arranged in parallel. The "parallel" here is theoretically parallel. In practice, during the processing and / or assembly process, there may be processing and / or assembly errors. All parallelism errors caused by processing and / or assembly are within the scope of protection of this application; in conjunction with reference to Figures 1 to 3 、 Figure 13 and Figure 14 The electric pump 100 further includes a first elastic pad 6, which is located between the second surface 522 and the end surface of the first stopper 231. The lower end of the first elastic pad 6 is abutted against the end surface of the first stopper 231, and the upper end of the first elastic pad 6 is abutted against the second surface 522. The "abutment" here can be direct abutment or indirect abutment. In this embodiment, it is direct abutment. Of course, a third party can also be set between the two, and then indirect abutment is achieved through the third party; the cover portion 52 of the shielding member 5 acts on the first elastic pad 6 enables the first elastic pad 6 to be squeezed along the axial direction of the electric pump; in this way, when the electric pump vibrates, the elasticity of the first elastic pad 6 is conducive to buffering the vibration generated between the stator assembly 2 and the shielding member 5, thereby helping to reduce the noise generated by the vibration; in addition, in this embodiment, the second surface 522 abuts against the upper end of the first elastic pad 6, and the first stop portion 231 abuts against the first elastic pad 6. Of course, the second surface 522 and the first stop portion 231 can also be at least one of them abutting against the end face of the first elastic pad 6.

[0058] See also Figures 1 to 3The electric pump 100 also includes a second elastic pad 7, the lower end of the second elastic pad 7 is arranged to abut against the first surface 521, and the upper end of the second elastic pad 7 is arranged to abut against the isolation part 4, and the positive pressure exerted on the second elastic pad 7 by the isolation part 4 enables the second elastic pad 7 to be squeezed along the axial direction of the electric pump; on the one hand, this is conducive to preventing the shielding member 5 from moving along the axial direction of the electric pump, and on the other hand, when the electric pump vibrates, the elasticity of the second elastic pad 7 is conducive to buffering the vibration generated between the shielding member 5 and the isolation part 4, thereby helping to reduce the noise generated by the vibration; in addition, the above-mentioned "abutment" can be direct abutment or indirect abutment. In this embodiment, it is direct abutment. Of course, a third party can also be set between the two, and then indirect abutment can be achieved through the third party.

[0059] See also Figure 13 and Figure 14 The cover portion 52 also includes a plurality of first through holes 523, which pass through the cover portion 52 along the axial direction, and the first through holes 523 are evenly distributed along the circumferential direction of the cover portion 52; in this embodiment, the first elastic pad 6 and the second elastic pad 7 are formed by injection molding with at least the shielding member 5 as an insert, and the first elastic pad 6 and the second elastic pad 7 are connected by a connecting portion 9, and the connecting portion 9 is located in the first through hole 523. In this embodiment, the connecting portion 9 is entirely located in the first through hole 523. Of course, only part of the connecting portion may be located in the first through hole 523; through the above method, on the one hand, it is beneficial to the axial limitation and radial limitation of the first elastic pad 6 and the second elastic pad 7. On the other hand, the limiting method of the above-mentioned first elastic pad 6 and the second elastic pad 7 is simple in structure and relatively low in cost.

[0060] See also Figure 13 and Figure 14 The cover 52 further includes a second through hole 524. The second through hole 524 passes through the upper and lower surfaces of the cover 52 in the axial direction of the cover 52. Figure 3 , the third stopper 233 is partially located in the second through hole 524, which helps to prevent the cover 52 from causing structural interference with the third stopper 233; of course, the cover 52 can also cover the third stopper 233, in which case the radial dimension of the second through hole 524 will be correspondingly smaller, and the radial dimension of the second through hole 524 only needs to meet the requirements of Figure 1 The isolation portion 4 in the middle does not form structural interference.

[0061] See also Figure 4 and Figure 5 The core yoke portion 213 includes a main body portion 2131 and a protrusion portion 2132. Along the radial direction of the stator core 21, the protrusion portion 2132 is protruded from the outer peripheral surface of the main body portion 2131. Figure 1In this embodiment, the protrusion 2132 is tightly fitted with the inner wall of the first housing 8. On the one hand, the protrusion 2132 is provided to reduce the contact area between the stator core 21 and the first housing 8, thereby facilitating the assembly of the stator assembly. On the other hand, a recess can be provided on the side wall of the inner periphery of the first housing 8. The recess and the protrusion 2132 are provided in correspondence, which helps prevent the stator assembly from rotating along the circumferential direction. Figure 3 、 Figure 5 、 Figure 13 and Figure 14 The barrel 51 includes a notch 511, which penetrates the shielding member 5 in the radial direction. Along the axial direction of the shielding member 5, the opening direction of the notch 511 is toward the stator core 21, and the width of the notch 511 is greater than the width of the protrusion 2132. Part of the protrusion 2132 is located in the notch of the notch 511, and there is a gap between the side of the notch 511 and the side of the protrusion 2132. In this way, by setting the notch 511, it is helpful to prevent the barrel 51 and the protrusion 2132 of the stator core 21 from causing structural interference. In addition, in this embodiment, only part of the protrusion 2132 is located in the notch of the notch 511. Of course, the height of the notch 511 can be extended by extending the height of the barrel 51, so that the protrusion 2132 can be completely located in the notch of the notch 511.

[0062] Also, see Figure 1 In this embodiment, the material of the isolation part 4 is plastic. Of course, the material of the isolation part 4 can also be metal. The metal isolation part can also absorb and reflect the electromagnetic waves radiated by the winding, which is further beneficial to reduce the electromagnetic waves radiated by the winding to the outside, thereby helping to reduce the interference of the electric pump to the outside.

[0063] See also Figures 15 and 16 , Figures 15 and 16 This is a structural diagram of the second embodiment of the electric pump in this application; the second embodiment of the electric pump will be introduced in detail below.

[0064] See also Figures 15 to 17 In this embodiment, at least a portion of the shielding member 5 is located on the periphery of the second section 223 of the winding 22. In this manner, when the electric pump 100a is in use, the shielding member 5a located on the periphery of the second section 223 of the winding 22 can absorb and reflect the electromagnetic waves generated by the winding, thereby reducing the electromagnetic waves radiated to the outside, thereby reducing the interference of the electric pump to the outside. Figures 15 to 20In this embodiment, the shielding member 5a includes a barrel portion 51a and a cover portion 52a. The barrel portion 51a is connected to the cover portion 52a. The barrel portion 51a is arranged around the outer periphery of the second stop portion 232. Of course, the barrel portion 51a can also be embedded in the second stop portion 232. In this way, the barrel portion 51a can absorb and reflect electromagnetic waves radiated toward the barrel portion 51a side, thereby helping to reduce the electromagnetic waves radiated to the outside, thereby helping to reduce the interference of the electric pump to the outside; specifically, see Figure 15 and Figure 16 In this embodiment, the height of the barrel 51a is greater than the height of the second stop 232, the top surface 5102 of the barrel 51a is higher than the lower end surface 2111 of the stator core, and the second stop 232 and the second section 223 of the winding are located inside the barrel 51a. In this way, along the axial direction of the insulating frame 23, the barrel 51a can surround the second stop 232 and the second section 223 of the winding, thereby enabling the barrel 51a to absorb and reflect more electromagnetic waves radiated toward the barrel 51a by the winding located on the inner periphery of the second stop 232.

[0065] See also Figures 15 to 17 The cover portion 52a at least covers the bottom 2231 of the second section 223 of the winding 22 and the end surface of the second stop portion 232; in this way, the cover portion 52a can absorb and reflect the electromagnetic waves radiated toward the cover portion 52a, which is beneficial to reduce the radiation of the electromagnetic waves generated by the winding to the lower end, thereby helping to reduce the interference of the electric pump to the outside.

[0066] See also Figure 20 and Figure 21 The cover portion 52a includes a first surface 521a and a second surface 522a. The second surface 522a is closer to the winding 22 than the first surface 521a. The first surface 521a and the second surface 522a are arranged in parallel. The "parallel" here is theoretically parallel. In actual processing and / or assembly, processing and / or assembly errors may exist. All parallelism errors caused by processing and / or assembly are within the scope of protection of this application; see Figure 20 and Figure 21 In this embodiment, the cover portion 52a further includes a third through hole 525a, which passes through the shielding member 5a along the axial direction. The third through hole 525a is provided so that the enameled wire in the winding can pass through the third through hole 525a, thereby enabling the winding 22 to be electrically connected to the electric control board assembly.

[0067] See also Figures 15 to 19The electric pump 100a also includes a first elastic pad 6, which is located between the second surface 522a and the end face of the second stop 232; the upper end of the first elastic pad 6 is abutted against the end face of the second stop 232, and the lower end of the first elastic pad 6 is abutted against the second surface 522a. The positive pressure exerted on the first elastic pad 6 by the cover portion 52a of the shielding member 5a enables the first elastic pad 6 to be squeezed along the axial direction of the electric pump; in this way, when the electric pump vibrates, the elasticity of the first elastic pad 6 is conducive to buffering the vibration generated between the stator assembly and the shielding member 5a, thereby helping to reduce the noise generated by the vibration.

[0068] See also Figure 15 The electric pump 100a further includes a first housing 8 having a housing portion 800. At least part of the stator assembly 2 is located in the cavity of the housing portion 800. The cavity of the housing portion 800 is the second cavity. Of course, the cavity of the housing portion 800 can also be a part of the second cavity. Figures 15 to 20 The electric pump 100a also includes a second elastic pad 7, the upper end of the second elastic pad 7 is arranged to abut against the first surface 521a, and the lower end of the second elastic pad 7 is arranged to abut against the first shell 8. The force exerted by the first shell 8 on the second elastic pad 7 enables the second elastic pad 7 to be squeezed along the axial direction of the electric pump. In this way, when the electric pump vibrates, the elasticity of the second elastic pad 7 is conducive to buffering the vibration generated between the shielding member 5a and the first shell 8, thereby helping to reduce the noise generated by the vibration.

[0069] Compared with the first embodiment of the electric pump, in this embodiment, the barrel portion 51a of the shielding member 5a is arranged on the outer periphery of the second section of the winding 22. Specifically, the barrel portion 51a of the shielding member 5a is arranged on the outer periphery of the second stop portion 232, so that the barrel portion 51a of the shielding member 5a can absorb and reflect the electromagnetic waves radiated by the second section of the winding toward the barrel portion 51a; in this embodiment, other structural features of the shielding member 5a can refer to the structural features of the shielding member 5a in the electric pump in the first embodiment, and will not be elaborated here.

[0070] See also Figures 22 to 23 , Figures 22 to 23 This is a structural diagram of the third embodiment of the electric pump in this application; the third embodiment of the electric pump will be introduced in detail below.

[0071] See also Figures 22 to 24In this embodiment, the electric pump 100b includes two shielding members, one of which is defined as a first shielding member 53b, and the other is defined as a second shielding member 54b. At least a portion of the first shielding member 53b is located on the periphery of the first section 222 of the winding, and at least a portion of the second shielding member 54b is located on the periphery of the second section 223 of the winding; the first shielding member 53b is at least partially disposed on the periphery of the first stop portion 231, and the second shielding member 54b is at least partially disposed on the periphery of the second stop portion 232; thus, when the electric pump is in use, the first shielding member 53b can absorb and reflect electromagnetic waves generated by the first section 222 of the winding, and the second shielding member 54b can absorb and reflect electromagnetic waves generated by the second section 223 of the winding, which is beneficial to reducing electromagnetic waves radiated to the outside, thereby reducing external interference of the electric pump. Figure 24 , the barrel portion of the first shielding member 53b is defined as the first barrel portion 531b, and the cover portion of the first shielding member 53b is defined as the first cover portion 532b. The first barrel portion 531b is arranged around the outer periphery of the first section 222 of the winding, and the first cover portion 532b at least covers the top 2221 of the first section 222 of the winding; in this way, the first cover portion 532b can absorb and reflect the electromagnetic waves radiated toward the first cover portion 532b, thereby helping to reduce the electromagnetic waves generated by the winding from radiating upward, and further helping to reduce the electromagnetic waves radiated to the outside, thereby helping to reduce the interference of the electric pump to the outside. ; The cylindrical portion of the second shielding member 54b is defined as the second cylindrical portion 541b, and the cover portion of the second shielding member 54b is defined as the second cover portion 542b. The second cylindrical portion 541b is arranged around the outer periphery of the second section 223 of the winding, and the second cover portion 542b at least covers the bottom 2231 of the second section 223 of the winding; in this way, the second cover portion 542b can absorb and reflect the electromagnetic waves radiated toward the second cover portion 542b, thereby helping to reduce the electromagnetic waves generated by the winding from radiating to the lower end, and further helping to reduce the electromagnetic waves radiated to the outside, thereby helping to reduce the interference of the electric pump to the outside.

[0072] Compared with the first embodiment of the electric pump, in this embodiment, the electric pump includes two shielding members, wherein the barrel portion of one shielding member is arranged on the outer periphery of the first section 222 of the winding, and the barrel portion of the other shielding member is arranged on the outer periphery of the second section 223 of the winding; specifically, the barrel portion of one shielding member is arranged on the outer periphery of the first stop portion 231, and the barrel portion of the other shielding member is arranged on the outer periphery of the second stop portion 232, so that the electromagnetic waves radiated by the winding toward the side where the first stop portion 231 and the side where the second stop portion 232 are located can be absorbed and reflected by the barrel portion; in addition, in this embodiment, other structural features of the first shielding member 53b can refer to the structural features of the shielding member in the electric pump in the first embodiment, and other structural features of the second shielding member 54b can refer to the structural features of the shielding member in the electric pump in the second embodiment, which will not be elaborated here.

[0073] See also Figures 25 to 26 , Figures 25 to 26 This is a structural diagram of the fourth embodiment of the electric pump in this application; the fourth embodiment of the electric pump will be introduced in detail below.

[0074] See also Figures 25 to 28 In this embodiment, the first shell 8c is formed by injection molding with at least the shielding member 5c as an insert; the shielding member 5c includes a barrel 51c and a flange 55c, the flange 55c is connected to the barrel 51c, the outer circumference of the barrel 51c is closer to the central axis of the shielding member 5c than the outer circumference of the flange 55c, the barrel 51c is arranged around the outer circumference of the first section 222 of the winding 22, specifically, in this embodiment, the barrel 51c is arranged around the outer circumference of the first stop 231, and the axial height of the barrel 51c is greater than the first stop The axial height of the portion 231 is such that the bottom surface 511c of the barrel portion 51c is lower than the lower portion of the upper end surface 211 of the stator core 21, and the end surface of the flange portion 55c is flush with the top 2221 of the second section 222 of the winding. Of course, the end surface of the flange portion 55c can also be higher than the top 2221 of the second section 222 of the winding. In this way, the barrel portion 51c can surround the second section 223 of the winding, thereby enabling the barrel portion 51a to absorb and reflect more electromagnetic waves radiated from the winding located in the first section 221 toward the barrel portion 51c; see Figures 25 to 28 The inner circumference of the cylinder 51c is partially exposed, so that during the injection molding process, the exposed inner circumference of the cylinder 51c can be used as the positioning reference surface of the mold.

[0075] See also Figure 28 The cylindrical portion 51c includes at least two holes 512c, and the holes 512c pass through the cylindrical portion 51c in the radial direction. In this embodiment, the holes 512c are evenly distributed along the circumference of the cylindrical portion 51c; see Figures 29 to 30b In this embodiment, the side wall of the accommodating portion 800c of the first shell 8c includes a first side wall 801c and a second side wall 802c. The diameter of the first side wall 801c is larger than the diameter of the second side wall 802c. The first side wall 801c is located above the second side wall 802c. The first side wall 801c and the second side wall 802c are connected by a step surface 803c. The first shell 8c includes at least two raised ribs 81c. The raised ribs 81c are evenly distributed along the circumference of the first shell 8c. The raised ribs 81c are located on the inner circumference of the first shell 8c. The raised ribs 81c are provided along the radial direction of the first shell 8c and protrude from a portion of the inner circumference of the first shell 8c in a direction close to the central axis of the first shell 8c. The raised ribs 81c extend along the axial direction of the first shell 8c. Figures 29 to 30b , part of the raised rib 81c is connected to the side wall of the accommodating portion 800c of the first shell 8c, specifically, the raised rib 81c includes a first root portion 811c and a second root portion 812c, for ease of description, see Figure 30b, the first root 811c and the second root 812c are shown by dashed lines, the first root 811c is located on the first side wall 801c, the second root 812c is partially located on the second side wall 802c and partially contacts the inner wall of the barrel portion 51c, the first root 811c is connected with the second root 812c through a connecting portion 813c, the connecting portion 813c is located above the step surface 803c, the lower end surface of the barrel portion 51c of the shielding member 5c contacts the step surface 803c, in the barrel portion 51c of the shielding member 5c, the position corresponding to the lower end surface of the barrel portion 51c and the hole portion 512c is located between the step surface 803c and the connecting portion 813c, the position above the hole portion 512c in the barrel portion 51c is located above the protruding rib 81c, the first root 811c is correspondingly arranged in the hole portion 512c, specifically, in the embodiment, the part of the protruding rib 81c protruding from the first root 811c is located in the hole portion 512c, and the main cross section of the part of the protruding rib 81c protruding from the first root 811c is correspondingly arranged in the cross section of the hole portion 512c, the above-mentioned "correspondingly arranged" means that the first root 811c and the hole portion 512c are correspondingly arranged in the same cross section shape; in this way, the above-mentioned arrangement is conducive to limiting the axial and circumferential directions of the shielding member 5c; in addition, in the embodiment, the position of the first root 811c is correspondingly arranged with the position of the hole portion 512c.

[0076] Referring to Figure 28 , the flange portion 55c includes a recessed portion 551c, along the radial direction of the shielding member 5c, the recessed portion 551c is recessed from the outer circumferential surface of the flange portion 55c to the direction close to the central axis of the shielding member 5c, and the recessed portion 551c penetrates along the axial direction of the flange portion 55c; by arranging the recessed portion 551c on the flange portion 55c, when the shielding member 5c is placed in the mold during the injection molding of the first housing 8c, the recessed portion 551c can be used as a feature recognition point for error prevention, thereby providing a reference for the placement direction of the shielding member 5c, and further enabling the position of the first root 811c to correspond to the position of the hole portion 512c during injection molding.

[0077] Referring to Figure 25 , in the embodiment, the material of the isolation portion 4c is metal, and part of the isolation portion 4c covers the winding 22, so that the isolation portion 4c covering the winding 22 can absorb and reflect the electromagnetic waves generated by the winding, thereby facilitating the reduction of electromagnetic waves generated by the winding and radiated to the upper end, and further facilitating the reduction of electromagnetic waves radiated to the outside by the winding, thereby facilitating the reduction of interference of the electric pump to the outside.

[0078] Compared with the first embodiment of the electric pump, in the embodiment, the first housing 8c is formed by injection molding with the shielding member 5c as an insert; that is, the first housing 8c and the shielding member 5c are fixedly connected by injection molding; thus, the structure is simple and the assembly is convenient.

[0079] See also Figures 31 to 32 , Figures 31 to 32 This is a structural diagram of the fifth embodiment of the electric pump in this application; the fifth embodiment of the electric pump will be introduced in detail below.

[0080] See also Figures 31 to 37 In this embodiment, the first shell 8d is formed by injection molding with at least the shielding member 5d as an insert; the shielding member 5d is cylindrical, and the shielding member 5d includes a cylindrical portion 51d, and the cylindrical portion 51d is arranged around the outer periphery of the second section 223 of the winding. Specifically, in this embodiment, the cylindrical portion 51d is arranged around the outer periphery of the second stop portion 232, and the axial height of the cylindrical portion 51d is greater than the axial height of the second stop portion 232. The inner circumference of the cylindrical portion 51d is partially exposed, so that during the injection molding process, the exposed inner circumference of the cylindrical portion 51d can be used as the positioning reference surface of the mold.

[0081] See also Figure 37 The cylindrical portion 51d includes at least two holes 512d, and the holes 512d pass through the cylindrical portion 51d in a radial direction; Figures 34 to 38 The first shell 8d includes at least two raised ribs 81d, which are evenly distributed along the circumference of the first shell 8d. The raised ribs 81d are raised along the radial direction of the first shell 8d from the inner circumference of the first shell 8d toward the central axis of the first shell 8c. The raised ribs 81d extend along the axial direction of the first shell 8d. In this embodiment, the side wall of the accommodating portion 800d of the first shell 8d includes a first side wall 801d and a second side wall 802d. The diameter of the first side wall 801d is smaller than the diameter of the second side wall 802d. The first side wall 801d is located above the second side wall 802d. The first side wall 801d and the second side wall 802d are connected by a step surface 803d. Figures 31 to 37 The upper end surface of the barrel 51d contacts the step surface 803d, and the lower end surface of the barrel 51d abuts the bottom wall 8001d of the accommodating portion 800d of the first shell 8d. The bottom 2231 of the second section 223 of the winding does not abut the bottom wall 8001d of the accommodating portion 800d of the first shell 8d. In this way, the barrel 51d can surround the second section 223 of the winding, and the barrel 51a can absorb and reflect more electromagnetic waves radiated by the winding located in the first section 221 toward the barrel 51c.

[0082] See also Figures 33 to 38 , part of the raised rib 81d is connected to the side wall of the accommodating portion 800d of the first shell 8d, specifically, the raised rib 81d includes a first root portion 811d, a second root portion 812d and a third root portion 813d. For ease of description, see Figure 37 , the first root 811d, the second root 812d and the third root 813d are shown by dotted lines respectively; see Figures 33 to 38 The first root 811d is located above the second root 812d, and the third root 813d is located below the second root 812d. Part of the first root 811d is located on the first side wall 801d, and part of it contacts the inner wall of the cylinder 51d. The third root 813d contacts the inner wall of the cylinder 51d. The second root 812d is located on the second side wall 802d, and the second root 812d is corresponding to the hole 512d. Specifically, in this embodiment, the part of the raised rib 81d that protrudes from the second root 812d is located in the hole 512d, and the main body cross-section corresponding to the part of the raised rib 81d that protrudes from the second root 812d is matched with the cross-section of the hole 512d. The "matching arrangement" here refers to the corresponding arrangement of the second root 812d and the hole 512d of the same cross-sectional shape; the above-mentioned arrangement is conducive to limiting the axial and circumferential positioning of the shielding component 5d.

[0083] See also Figure 25 In this embodiment, the material of the isolation part 4d is metal, and part of the isolation part 4d covers the top of the winding, so that the isolation part 4c covering the top of the winding can absorb and reflect the electromagnetic waves generated by the winding, thereby helping to reduce the electromagnetic waves generated by the winding radiating to the upper end, and further helping to reduce the electromagnetic waves radiated by the winding to the outside, thereby helping to reduce the interference of the electric pump to the outside.

[0084] Compared with the fifth embodiment of the electric pump, in this embodiment, the first housing 8d is formed by injection molding with at least the shielding member 5d as an insert, and the cylindrical portion 51d is disposed around the outer circumference of the second section 223 of the winding.

[0085] See also Figures 39 to 40 , Figures 39 to 40 This is a structural diagram of the sixth embodiment of the electric pump in this application; the sixth embodiment of the electric pump will be introduced in detail below.

[0086] See also Figures 39 to 40In this embodiment, the electric pump 100e includes two shielding components, one of which is defined as a first shielding component 53e, and the other is defined as a second shielding component 54e. The first shielding component 53e is at least partially arranged on the outer periphery of the first section 222 of the winding, and the second shielding component 54e is at least partially arranged on the outer periphery of the second section 223 of the winding. Specifically, the first shielding component 53e is at least partially arranged on the outer periphery of the first stop portion 231, and the second shielding component 54e is at least partially arranged on the outer periphery of the second stop portion 232; in this way, when the electric pump is in use, the first shielding component 53e can absorb and reflect the electromagnetic waves generated by the first section 222 of the winding, and the second shielding component 54b can absorb and reflect the electromagnetic waves generated by the second section 223 of the winding, thereby helping to reduce the electromagnetic waves radiated to the outside, thereby helping to reduce the interference of the electric pump to the outside; in this embodiment, the first shell 8e is formed by injection molding with at least the first shielding component 53e and the second shielding component 54e as inserts.

[0087] In addition, in this embodiment, other structural features of the first shielding member can refer to the structural features of the shielding member in the electric pump in the fifth embodiment, and other structural features of the second shielding member can refer to the structural features of the shielding member in the electric pump in the sixth embodiment, which will not be described in detail here.

[0088] 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 this specification has described the present invention in detail with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An electric pump, comprising a stator assembly, the stator assembly comprising a stator core, an insulating frame, and a winding, the winding comprising a main section, a first section, and a second section, the main section connecting the first section and the second section, the first section being located above the second section; the stator core comprising a core tooth portion, a core yoke portion, and a core neck portion, the core neck portion connecting the core tooth portion and the core yoke portion, the core yoke portion being farther from a central axis of the stator core than the core tooth portion, the core yoke portion being located at an outer periphery of the winding, and the core neck portion being capable of providing support for winding the winding; and characterized in that: A first reference plane is defined, which coincides with the axial center axis of the core tooth portion and the axial center axis of the core neck portion. A cross section is made on the stator assembly along the first reference plane. The core yoke portion includes a main body portion, and the upper end of the main body section cross section is flush with the upper end of the main body section cross section, and the lower end of the main body section cross section is flush with the lower end of the main body section cross section. The electric pump also includes a shielding member, the material of the shielding member is a conductive metal material, and at least a portion of the shielding member is located on the periphery of at least one of the first segment and the second segment. The electric pump includes a first elastic pad, which abuts against the shielding member, and the first elastic pad abuts against the insulating frame.

2. The electric pump according to claim 1, characterized in that: The shielding member includes a cylindrical portion and a cover portion, the cylindrical portion is connected to the cover portion, and the cylindrical portion is arranged around the outer periphery of at least one of the first segment and the second segment; when at least a portion of the shielding member is arranged around the outer periphery of the first segment, the shielding member arranged around the outer periphery of the first segment is defined as a first shielding member, the cylindrical portion of the first shielding member is defined as a first cylindrical portion, and the cover portion of the first shielding member is defined as a first cover portion, the first cylindrical portion is arranged around the outer periphery of the first segment, and the first cover portion at least covers the top of the first segment; When at least part of the shielding member is provided on the outer periphery of the second section, the shielding member provided on the outer periphery of the second section is defined as a second shielding member, the cylindrical portion of the second shielding member is defined as a second cylindrical portion, and the cover portion of the second shielding member is defined as a second cover portion. The second cylindrical portion is provided around the outer periphery of the second section, and the second cover portion at least covers the bottom of the second section.

3. The electric pump according to claim 1 or 2, characterized in that: The insulating frame includes a first stopper, a second stopper and a winding portion, at least a portion of the stator core is located between the first stopper and the second stopper, the first stopper, the stator core and the second stopper are distributed along the axial direction of the electric pump, and the winding is wound around the winding portion; the first stopper is connected to one end of the top of the winding portion, and the second stopper is connected to one end of the bottom of the winding portion; at least a portion of the shielding member is located on the outer periphery of at least one of the first stopper and the second stopper.

4. The electric pump according to claim 3, characterized in that: The shielding member includes a cover portion, which includes a first surface and a second surface, the second surface being closer to the winding than the first surface; the electric pump also includes a first elastic pad, at least a portion of the first elastic pad is located between the second surface and the insulating frame; at least one of the insulating frame and the second surface abuts against the end face of the first elastic pad.

5. The electric pump according to claim 4, characterized in that: The electric pump also includes a rotor assembly and an isolation portion. The electric pump has a pump inner cavity, which includes a first cavity and a second cavity. The first cavity is located on one side of the isolation portion, and the second cavity is located on the other side of the isolation portion. The rotor assembly is located in the first cavity, and the stator assembly is located in the second cavity. The electric pump also includes a second elastic pad, one end of the second elastic pad abuts the first surface, and the other end of the second elastic pad abuts the isolation portion. The positive pressure acting on the second elastic pad through the isolation portion enables the second elastic pad to be squeezed along the axial direction of the electric pump.

6. The electric pump according to claim 4, characterized in that: The electric pump includes a first shell, the first shell has a accommodating portion, at least part of the stator assembly is located in the accommodating portion, the electric pump also includes a second elastic pad, one end of the second elastic pad abuts the first surface, and the other end of the second elastic pad is arranged to abut the first shell. The positive pressure exerted on the second elastic pad by the first shell enables the second elastic pad to be squeezed along the axial direction of the electric pump.

7. The electric pump according to claim 5 or 6, characterized in that: The cover portion includes a plurality of first through holes, which pass through the upper and lower surfaces of the cover portion; the first elastic pad and the second elastic pad are formed by injection molding with at least the shielding component as an insert, and the first elastic pad and the second elastic pad are connected by a connecting portion, and at least part of the connecting portion is located in the first through hole.

8. The electric pump according to any one of claims 1, 2, 4 to 6, characterized in that: The core yoke also includes a protrusion, which is protruded from the outer peripheral surface of the main body along the radial direction of the stator core; the shielding member includes a cylindrical member, which includes a notch, which passes through the outer peripheral surface and the inner peripheral surface of the cylindrical member along the radial direction of the shielding member, and the opening direction of the notch is toward the stator core along the axial direction of the shielding member, at least part of the protrusion is located in the notch of the notch, and there is a gap between the side of the notch and the side of the protrusion.

9. The electric pump according to claim 3, characterized in that: The core yoke also includes a protrusion, which is protruded from the outer peripheral surface of the main body along the radial direction of the stator core; the shielding member includes a cylindrical member, which includes a notch, which passes through the outer peripheral surface and the inner peripheral surface of the cylindrical member along the radial direction of the shielding member, and the opening direction of the notch is toward the stator core along the axial direction of the shielding member, at least part of the protrusion is located in the notch of the notch, and there is a gap between the side of the notch and the side of the protrusion.

10. The electric pump according to claim 7, characterized in that: The core yoke also includes a protrusion, which is protruded from the outer peripheral surface of the main body along the radial direction of the stator core; the shielding member includes a cylindrical member, which includes a notch, which passes through the outer peripheral surface and the inner peripheral surface of the cylindrical member along the radial direction of the shielding member, and the opening direction of the notch is toward the stator core along the axial direction of the shielding member, at least part of the protrusion is located in the notch of the notch, and there is a gap between the side of the notch and the side of the protrusion.

11. The electric pump according to claim 1, characterized in that: The electric pump includes a first shell, which has a accommodating portion, and at least part of the stator assembly is located in the cavity of the accommodating portion. The first shell is formed by injection molding with at least the shielding component as an insert; the shielding component includes a cylindrical portion, and the cylindrical portion is arranged around the outer periphery of at least one of the first section and the second section.

12. The electric pump according to claim 11, characterized in that: The cylindrical portion is arranged around the outer circumference of the first section; the side wall of the accommodating portion includes a first side wall and a second side wall, the first side wall is located above the second side wall, and the diameter of the first side wall is larger than the diameter of the second side wall; the first shell includes at least two raised ribs, the raised ribs are distributed along the circumference of the first shell, and part of the raised ribs are raised along the radial direction of the first shell from part of the side wall of the accommodating portion toward the direction close to the central axis of the first shell, and the raised ribs extend along the axial direction of the first shell; the raised ribs include a first root and a second root, the first root is located on the first side wall, and the second root is partially located on the second side wall and partially abuts against the inner wall of the cylindrical portion, the cylindrical portion includes a hole portion, the first root is corresponding to the hole portion, and the part of the raised rib protruding from the first root is at least partially located in the hole portion.

13. The electric pump according to claim 11 or 12, characterized in that: The shielding member includes a flange portion, which is connected to the cylindrical portion, and the outer peripheral surface of the cylindrical portion is closer to the central axis of the shielding member than the outer peripheral surface of the flange portion; the flange portion includes a recessed portion, which is recessed from the outer peripheral surface of the flange portion toward the central axis of the shielding member along the radial direction of the shielding member, and the recessed portion passes through the upper and lower surfaces of the flange portion along the axial direction of the shielding member.

14. The electric pump according to claim 11, characterized in that: The cylindrical portion is arranged around the outer circumference of the second section; the side wall of the accommodating portion includes a first side wall and a second side wall, the first side wall is located above the second side wall, and the diameter of the first side wall is smaller than the diameter of the second side wall; the first shell includes at least two raised ribs, the raised ribs are distributed along the circumference of the first shell, and some of the raised ribs are raised along the radial direction of the first shell from part of the side wall of the accommodating portion toward the direction close to the central axis of the first shell, and the raised ribs extend along the axial direction of the first shell; the raised ribs include a first root, a second root and a third root, the first root is partially located on the first side wall, and partially abuts against part of the inner wall of the cylindrical portion, the third root abuts against part of the inner wall of the cylindrical portion, the second root is located on the second side wall, the cylindrical portion includes a hole portion, the second root is correspondingly arranged in shape with the hole portion, and the part of the raised rib protruding from the second root is at least partially located in the hole portion.

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