Comprehensive grounding structure of electronic water pump and electronic water pump using same

Abstract

The utility model discloses a comprehensive grounding structure of an electronic water pump and the electronic water pump applying the comprehensive grounding structure, and relates to the technical field of electronic water pumps and parts thereof, the comprehensive grounding structure comprises a stator assembly, a pump shell, a driving circuit board and a dry and wet shielding cover; the stator assembly is at least provided with a grounding terminal, the driving circuit board is provided with a first grounding guide hole matched with the grounding terminal, and the dry and wet shielding cover is provided with a second grounding guide hole matched with the grounding terminal; and the grounding terminal of the stator assembly passes through the second grounding guide hole of the dry and wet shielding cover and is in contact with the second grounding guide hole, and the grounding terminal of the stator assembly is connected into the first grounding guide hole of the driving circuit board. The utility model mainly solves the problem of how to provide a grounding structure for the dry and wet shielding cover of the electronic water pump. Through the single grounding structure, grounding of the dry and wet shielding cover and the stator assembly is achieved at the same time, good mechanical stability is achieved, loosening and deformation are not prone to occurring, and the electromagnetic compatibility of the electronic water pump is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic water pump and its spare part technical field, concretely is a kind of comprehensive grounding structure of electronic water pump and the electronic water pump of application thereof. BACKGROUND

[0002] Electronic water pump has higher output efficiency and can realize accurate flow control, so electronic water pump is widely used in automobile, household appliance and industrial equipment, especially new energy automobile usually has two or even more electronic water pumps, and electronic water pump is the power source of the whole cooling system of new energy automobile, and the power battery, drive motor and the like of new energy automobile need to rely on electronic water pump to drive cooling liquid to circulate cooling.

[0003] The drive circuit board is one of the core components of the electronic water pump, which is used to drive the stator assembly to operate to generate a rotating magnetic field, thereby driving the rotor assembly and impeller to rotate; the drive circuit board is loaded with a main control, power electronic devices and necessary peripheral circuits, and a large amount of heat will be generated when energized, therefore, a heat dissipation structure is usually configured for the drive circuit board of the electronic water pump.

[0004] The Chinese utility model patent publication text with publication number CN210564744U and the name of "an internal liquid-cooled automobile electronic water pump", and the Chinese utility model patent publication text with publication number CN208396956U and the name of "an electronic water pump" both disclose a structure and method for dissipating heat from the drive circuit board using liquid medium in the electronic water pump.

[0005] In the electronic water pump, if liquid medium is used to dissipate heat from the drive circuit board, it needs to rely on a dry-wet shielding cover, specifically, a dry-wet shielding cover made of metal needs to be arranged at the end of the rotor cavity of the electronic water pump, which is used to close the rotor cavity, support and fix the drive circuit board, and exchange heat between the drive circuit board and the liquid medium in the rotor cavity, so that the heat generated by the drive circuit board can be conducted into the liquid medium in the rotor cavity.

[0006] In order to ensure the heat conduction performance of the dry-wet shielding cover, a metal with good heat conduction performance needs to be used to manufacture the dry-wet shielding cover, however, the components in direct contact with the dry-wet shielding cover in the electronic water pump may include the drive circuit board, the rotating shaft / axle core, the rotor assembly and the stator assembly, in addition, the liquid medium in the rotor cavity will also be in direct contact with the dry-wet shielding cover, so that the dry-wet shielding cover is electrified, at least causing the problems of electric leakage and affecting the EMC performance of the electronic water pump (when the electronic water pump needs to be tested for radiation emission, the electrified dry-wet shielding cover may also form an antenna structure to radiate signals outward).

[0007] Therefore, how to provide a grounding structure for the dry and wet shielding cover of the electronic water pump becomes one of the problems to be solved. Practical new type content

[0008] The utility model discloses a kind of integrated grounding structure of electronic water pump and electronic water pump applied thereto, which can provide grounding structure for dry and wet shielding cover and stator assembly of electronic water pump simultaneously.

[0009] To achieve the above object, the utility model provides the following technical scheme: an integrated grounding structure of electronic water pump is applied in electronic water pump;The electronic water pump at least includes stator assembly, pump shell, drive circuit board and dry and wet shielding cover;At least one grounding terminal is provided on the stator assembly;A rotor chamber is provided in the pump shell, the stator assembly is installed / implanted in the pump shell and located outside the rotor chamber, and the grounding terminal of the stator assembly is exposed to the pump shell;A first grounding guide hole adapted to the grounding terminal is formed on the drive circuit board;A second grounding guide hole adapted to the grounding terminal is formed on the dry and wet shielding cover;The dry and wet shielding cover is fixed in the pump shell and isolates the rotor chamber in the pump shell, and the drive circuit board is fixed in the pump shell and located outside the rotor chamber of the pump shell;The grounding terminal of the stator assembly passes through the second grounding guide hole of the dry and wet shielding cover and contacts the second grounding guide hole, and then the grounding terminal of the stator assembly is connected to the first grounding guide hole of the drive circuit board.

[0010] In the above technical solution, the inner wall of the second grounding guide hole of the dry and wet shielding cover is formed with a contact tooth;The contact tooth can exert pressure on the grounding terminal of the stator assembly.

[0011] In the above technical solution, the inner wall of the second grounding guide hole is formed with the contact tooth on at least two opposite sides.

[0012] In the above technical solution, the number of contact teeth formed on the inner wall of any side of the second grounding guide hole is single;Or, the number of contact teeth formed on the inner wall of any side of the second grounding guide hole is several.

[0013] In the above technical solution, the cross-sectional shape of the contact tooth is at least one of trapezoidal, triangular, arc-shaped, polygonal and irregular shape.

[0014] In the above technical solution, the entrance of the second grounding guide hole of the dry and wet shielding cover is configured as a radial shape;The thickness of the grounding terminal of the stator assembly is D1, and the width of the entrance of the second grounding guide hole is D2;Then, D1 < D2.

[0015] In the above technical solution, the stator assembly is embedded in the pump casing; at least a portion of the grounding terminal is also embedded in the pump casing, and at least another portion of the grounding terminal passes through the pump casing; the pump casing is provided with a terminal retaining rib around the grounding terminal at the passing position of the grounding terminal.

[0016] In the above technical solution, the stator assembly is also provided with an electrical connection terminal; the driving circuit board is also provided with an electrical connection guide hole adapted to the electrical connection terminal; the electrical connection terminal of the stator assembly is hidden in the dry-wet shielding cover and connected to the electrical connection guide hole of the driving circuit board.

[0017] In the above technical solution, the electronic water pump also includes a dry-wet shielding sleeve; the dry-wet shielding sleeve is fixed in the pump casing to enclose the rotor chamber in the pump casing; a joint end is formed at the dry-wet shielding cover, and the joint end of the dry-wet shielding cover is engaged with the open end of the dry-wet shielding sleeve to isolate the rotor chamber.

[0018] An electronic water pump comprises the above-mentioned comprehensive grounding structure of the electronic water pump.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: the comprehensive grounding structure of the electronic water pump of the present invention and the electronic water pump using the same, the grounding terminal of the stator assembly passes through the second grounding guide hole of the dry and wet shielding cover and contacts the second grounding guide hole, and then the grounding terminal of the stator assembly is connected to the first grounding guide hole of the driving circuit board; through a single grounding structure, the grounding of the dry and wet shielding cover and the stator assembly is achieved at the same time, the number of parts of the electronic water pump is reduced, the product structure of the electronic water pump is simplified, the production and assembly of the electronic water pump are simpler, thereby reducing the manufacturing cost of the electronic water pump, and avoiding errors and failures that may occur when assembling multiple parts; the grounding structure has good mechanical stability and is not prone to loosening and deformation; after the dry and wet shielding cover and the stator assembly are grounded, the electromagnetic interference of the electronic water pump is effectively weakened, and the electromagnetic compatibility (EMC performance) of the electronic water pump is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural view of the electronic water pump in the present utility model.

[0021] Figure 2 for Figure 1 A partial enlarged view in .

[0022] Figure 3 It is a cross-sectional view of the electronic water pump in the present utility model.

[0023] Figure 4 for Figure 3 A partial enlarged view of B in FIG.

[0024] The reference signs are: 1, stator assembly; 11, electrical connection terminal; 12, ground terminal; 2, pump shell; 21, terminal retaining rib; 3, drive circuit board; 31, electrical connection guide hole; 32, first ground guide hole; 4, dry-wet shielding cover; 41, second ground guide hole; 411, contact tooth; 412, inlet; 42, joint end; 5, dry-wet shielding sleeve; 51, rotor chamber. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0026] The embodiment provides a comprehensive grounding structure of an electronic water pump, which is applied to the electronic water pump and can simultaneously provide grounding structures for a dry-wet shielding cover 4 and a stator assembly 1 of the electronic water pump.

[0027] Please refer to Figures 1-4 The electronic water pump at least comprises the stator assembly 1, the pump shell 2, the drive circuit board 3 and the dry-wet shielding cover 4.

[0028] The stator assembly 1 can be used to generate a rotating magnetic field to drive the rotor assembly of the electronic water pump to rotate; the pump shell 2 can be used to constitute the shell of the electronic water pump and provide a structural basis for the electronic water pump; the drive circuit board 3 is a printed circuit board (PCB), which carries a main control, power electronic devices and necessary peripheral circuits, and is used to drive the stator assembly 1 to operate to generate a rotating magnetic field; the dry-wet shielding cover 4 is a plate-shaped member made of metal material (for example, aluminum alloy or stainless steel), which has good heat conduction performance.

[0029] In the embodiment, the pump shell 2 is an integrally injection molded structure, and the stator assembly 1 is embedded in the pump shell 2 in an integrally injection molded manner, so that the stator assembly 1 and the pump shell 2 form an integrated structure, thereby constituting a pump shell 2 stator assembly; the specific structure of the stator assembly 1, the pump shell 2 and the pump shell 2 stator assembly and the manufacturing method thereof can be referred to the Chinese utility model patent publication text with the publication number CN221347302U and the name of 《Pump shell 2 stator assembly and electronic water pump applying same》, which will not be described here.

[0030] The stator assembly 1 is provided with at least a ground terminal 12, which is a metal terminal (for example, copper alloy material) with a free end configured as a pointed end.

[0031] The pump shell 2 is provided with a rotor chamber 51, the stator assembly 1 is installed / embedded in the pump shell 2 and located outside the rotor chamber 51, and the grounding terminal 12 of the stator assembly 1 is exposed to the pump shell 2.

[0032] The driving circuit board 3 is provided with a first grounding guide hole 32 matched with the grounding terminal 12, the first grounding guide hole 32 is an electrical through hole penetrating the driving circuit board 3, the inner wall of the first grounding guide hole 32 is plated with copper foil, so that the first grounding guide hole 32 can be electrically connected with the printed circuit on the driving circuit board 3, and then the first grounding guide hole 32 can be conducted to the ground or negative electrode of the driving circuit board 3.

[0033] The dry-wet shielding cover 4 is provided with a second grounding guide hole 41 matched with the grounding terminal 12, the first grounding guide hole 32 is a mechanical through hole penetrating the dry-wet shielding cover 4,

[0034] The dry-wet shielding cover 4 is fixed in the pump shell 2 and separates the rotor chamber 51 in the pump shell 2, in the embodiment, the pump shell 2 is formed with a screw column, after the screw passes through the dry-wet shielding cover 4, the screw is locked into the screw column of the pump shell 2, so as to fix the dry-wet shielding cover 4 on the pump shell 2; the driving circuit board 3 is fixed in the pump shell 2 and located outside the rotor chamber 51 of the pump shell 2, in the embodiment, the pump shell 2 is formed with a screw column, after the screw passes through the driving circuit board 3, the screw is locked into the screw column of the pump shell 2, so as to fix the driving circuit board 3 on the pump shell 2; in addition, the pump shell 2 is formed with a positioning column for positioning the dry-wet shielding cover 4 and the driving circuit board 3 during assembly; the driving circuit board 3 is attached to the surface of the dry-wet shielding cover 4, and a heat conducting medium (such as heat conducting silicone grease) is coated between the driving circuit board 3 and the dry-wet shielding cover 4, so that the driving circuit board 3 can exchange heat with the dry-wet shielding cover 4.

[0035] The grounding terminal 12 of the stator assembly 1 passes through the second grounding guide hole 41 of the dry-wet shielding cover 4 and contacts the second grounding guide hole 41, and then the grounding terminal 12 of the stator assembly 1 is connected to the first grounding guide hole 32 of the driving circuit board 3.

[0036] Further, in order to improve the reliability of the grounding terminal 12 and the second grounding guide hole 41 of the dry-wet shielding cover 4 when they are in contact, and to avoid the grounding terminal 12 being suspended, the inner wall of the second grounding guide hole 41 of the dry-wet shielding cover 4 is formed with a contact tooth 411, which can apply pressure to the grounding terminal 12 of the stator assembly 1.

[0037] Further specifically, the inner wall of at least two opposite surfaces of the second grounding guide hole 41 is formed with a contact tooth 411; in the embodiment, the inner wall of the two longer surfaces of the second grounding guide hole 41 is respectively formed with a contact tooth 411, so that the two groups of contact teeth 411 are opposite to each other, thereby applying pressure to the two surfaces of the grounding terminal 12.

[0038] More specifically, a single contact tooth 411 is formed on the inner wall of any one side of the second grounding guide hole 41; alternatively, a plurality of contact teeth 411 are formed on the inner wall of any one side of the second grounding guide hole 41. In this embodiment, two contact teeth 411 are respectively formed on the two longer inner walls of the second grounding guide hole 41. Providing multiple contact teeth 411 can further improve the reliability of the contact between the ground terminal 12 and the second grounding guide hole 41 of the dry-wet shielding cover 4.

[0039] Specifically, the cross-section of the contact tooth 411 (specifically the cross-section along the radial direction of the dry-wet shielding cover 4) is in the shape of at least one of a trapezoid, a triangle, an arc, a polygon and an irregular shape; in this embodiment, the cross-section of the contact tooth 411 is a trapezoid, so that the top surface of the contact tooth 411 is flat, but the surface area is small, so that the contact tooth 411 can be reliably contacted with the grounding terminal 12, and the pressure applied by the contact tooth 411 to the grounding terminal 12 is increased.

[0040] Furthermore, the entrance 412 of the second grounding guide hole 41 of the dry and wet shielding cover 4 is configured to be radial (ie, a trumpet shape opening outward); Figure 4 As shown, the thickness of the ground terminal 12 of the stator assembly 1 is D1, and the width of the entrance 412 of the second grounding guide hole 41 is D2. Then, D1 < D2. This configuration makes it easier for the free end of the ground terminal 12 to be introduced into the entrance 412 of the second grounding guide hole 41, reducing the dimensional tolerance requirements of the ground terminal 12 and the second grounding guide hole 41, simplifying the assembly process of the electronic water pump, and improving the product qualification rate.

[0041] In this embodiment, the stator assembly 1 is embedded in the pump casing 2; at least a portion of the grounding terminal 12 is also embedded in the pump casing 2, and at least another portion of the grounding terminal 12 passes through the pump casing 2; the pump casing 2 is provided with a terminal retaining rib 21 around the grounding terminal 12 at the passing position of the grounding terminal 12. Specifically, the terminal retaining rib 21 is integrally formed in the pump casing 2 and is arranged around the grounding terminal 12 to reinforce the free end of the grounding terminal 12 to prevent the grounding terminal 12 from bending or other deformation during assembly and use.

[0042] Further, the stator assembly 1 is further provided with an electric connection terminal 11, which is a metal terminal (for example, copper alloy material) configured as a pointed end shape. In this embodiment, three electric connection terminals 11 are provided, corresponding to U phase, V phase and W phase respectively. The driving circuit board 3 is further provided with an electric connection guide hole 31 adapted to the electric connection terminal 11. The electric connection guide hole 31 is an electrically conductive hole penetrating the driving circuit board 3, and the inner wall thereof is plated with copper foil, so that the electric connection guide hole 31 can be electrically connected to the printed circuit on the driving circuit board 3, and further conduct electricity to the circuit of the driving circuit board 3. The electric connection terminal 11 of the stator assembly 1 is located in the dry-wet shielding cover 4 and inserted into the electric connection guide hole 31 of the driving circuit board 3. In this embodiment, the electric connection terminal 11 and the dry-wet shielding cover 4 are arranged without interfering with each other, so that the electric connection terminal 11 of the stator assembly 1 is located in the dry-wet shielding cover 4.

[0043] Further, the electronic water pump further comprises a dry-wet shielding sleeve 5, which is a metal or engineering plastic material circular sleeve member with open ends. The dry-wet shielding sleeve 5 is fixed in the pump shell 2 to enclose a rotor chamber 51 in the pump shell 2, that is, the inner cavity of the dry-wet shielding sleeve 5 is the rotor chamber 51. The dry-wet shielding cover 4 is formed with an engaging end 42, which is engaged with the open end of the dry-wet shielding sleeve 5 to isolate the rotor chamber 51. In this embodiment, a sealing ring is arranged between the engaging end 42 of the dry-wet shielding cover 4 and the open end of the dry-wet shielding sleeve 5, so that the rotor chamber 51 is sealed.

[0044] When the dry-wet shielding cover 4 is assembled, it is easily fitted into the pump shell 2 under the positioning and guidance of the positioning column of the pump shell 2. At this time, the second grounding guide hole 41 of the dry-wet shielding cover 4 will be fitted on the grounding terminal 12 of the stator assembly 1. Since the inlet 412 of the second grounding guide hole 41 is configured in a radial shape, the grounding terminal 12 is easily guided into the inlet 412 of the second grounding guide hole 41. When the driving circuit board 3 is assembled, it is easily fitted into the pump shell 2 under the positioning and guidance of the positioning column of the pump shell 2. At this time, the first grounding guide hole 32 of the driving circuit board 3 will be fitted on the grounding terminal 12 of the stator assembly 1. In addition, the grounding terminal 12 and the first grounding guide hole 32 of the driving circuit board 3 need to be soldered, so as to achieve mechanical fixation and electrical conduction of the grounding terminal 12 and the first grounding guide hole 32.

[0045] The embodiment also provides an electronic water pump comprising the comprehensive grounding structure of the electronic water pump.

[0046] The ground terminal 12 of the stator assembly 1 passes through the second ground guide hole 41 of the dry-wet shielding cover 4 and contacts the second ground guide hole 41, and then the ground terminal 12 of the stator assembly 1 is connected into the first ground guide hole 32 of the driving circuit board 3; through the single ground structure, the ground of the dry-wet shielding cover 4 and the stator assembly 1 is realized, the number of parts of the electronic water pump is reduced, the product structure of the electronic water pump is simplified, the production and assembly of the electronic water pump are more convenient, so that the manufacturing cost of the electronic water pump is reduced, and errors and faults possibly caused by assembly of multiple parts are avoided; the ground structure has good mechanical stability and is not easy to loosen and deform; after the dry-wet shielding cover 4 and the stator assembly 1 are grounded, the electromagnetic interference of the electronic water pump is effectively weakened, and the electromagnetic compatibility (EMC performance) of the electronic water pump is improved.

[0047] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A comprehensive grounding structure of an electronic water pump, applied in an electronic water pump; characterized in that, The electronic water pump comprises at least a stator assembly, a pump shell, a driving circuit board and a dry-wet shielding cover; The stator assembly is provided with at least a grounding terminal; The pump shell is provided with a rotor chamber, the stator assembly is installed / buried in the pump shell and located outside the rotor chamber, and the grounding terminal of the stator assembly is exposed to the pump shell; The driving circuit board is provided with a first grounding guide hole matched with the grounding terminal; The dry-wet shielding cover is provided with a second grounding guide hole matched with the grounding terminal; The dry-wet shielding cover is fixed in the pump shell and separates the rotor chamber in the pump shell, and the driving circuit board is fixed in the pump shell and located outside the rotor chamber of the pump shell; The grounding terminal of the stator assembly passes through the second grounding guide hole of the dry-wet shielding cover and contacts with the second grounding guide hole, and then the grounding terminal of the stator assembly is connected to the first grounding guide hole of the driving circuit board.

2. The integrated ground structure of an electric water pump according to claim 1, characterized by The inner wall of the second grounding guide hole of the dry-wet shielding cover is formed with a contact tooth; The contact tooth can apply pressure to the grounding terminal of the stator assembly.

3. The integrated ground structure of an electric water pump according to claim 2, wherein The inner wall of at least two opposite sides of the second grounding guide hole is formed with the contact tooth.

4. The integrated ground structure of an electronic water pump according to claim 2 or 3, characterized in that, The number of the contact tooth formed on the inner wall of any side of the second grounding guide hole is single; Or, the number of the contact tooth formed on the inner wall of any side of the second grounding guide hole is several.

5. The integrated ground structure of an electronic water pump according to claim 2 or 3, characterized by, The cross-sectional shape of the contact tooth is at least one of trapezoidal, triangular, arc-shaped, polygonal and irregular shape.

6. The integrated ground structure of an electronic water pump according to any one of claims 1 to 3, wherein The entrance of the second grounding guide hole of the dry-wet shielding cover is configured as a radial shape. The thickness of the grounding terminal of the stator assembly is D1, and the width of the entrance of the second grounding guide hole is D2; D1 < D2.

7. The integrated ground structure of an electric water pump according to claim 1, wherein The stator assembly is buried in the pump shell; At least a part of the grounding terminal is also buried in the pump shell, and at least another part of the grounding terminal passes out of the pump shell; The pump shell is provided with a terminal retaining rib around the grounding terminal at the position where the grounding terminal passes out.

8. The integrated ground structure of an electric water pump according to claim 1, wherein The stator assembly is further provided with an electric connection terminal; The driving circuit board is further provided with an electric connection guide hole matched with the electric connection terminal; The electric connection terminal of the stator assembly is located in the dry-wet shielding cover and connected to the electric connection guide hole of the driving circuit board.

9. The integrated ground structure of an electric water pump according to claim 1, wherein The electronic water pump further comprises a dry-wet shielding sleeve; The dry-wet shielding sleeve is fixed in the pump shell to shield the rotor chamber in the pump shell; The dry-wet shielding cover is provided with an engaging end, and the engaging end of the dry-wet shielding cover engages with the opening end of the dry-wet shielding sleeve to separate the rotor chamber.

10. An electronic water pump characterized by comprising: The integrated grounding structure of the electronic water pump according to any one of claims 1-9.

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