Electronic water pump dry cavity seal and stator pre-tightening structure

Abstract

The application discloses an electronic water pump dry cavity sealing and stator pre-tightening structure, a stator assembly is adaptively installed on the lower part of the inner wall of a pump body assembly, and the stator assembly is sealingly connected with the pump body assembly after being subjected to axial pressure; an integrally-formed sealing pre-tightening assembly is arranged at the upper end of the stator assembly, a waterproof sleeve assembly is integrally formed at the upper end of the sealing pre-tightening assembly, the end surface of the waterproof sleeve assembly and the end surface of the pump body assembly are clamped with the end surface of the sealing pre-tightening assembly, and the two side end surfaces of the sealing pre-tightening assembly realize sealing of the waterproof sleeve assembly and the pump body assembly respectively after the electronic water pump is locked. The whole structure is simple and compact, direct forward installation can be realized during assembly, quick assembly of the sealing pre-tightening assembly can be realized, automatic production of the product is facilitated, the assembly efficiency of the electronic water pump product is improved, the consistency of the assembled product is improved, the dry cavity sealing and stator pre-tightening functions of the electronic water pump can be effectively realized, and the electronic water pump can be ensured to stably run in a harsh environment with high vibration, moisture and water.

Description

Technical Field

[0001] This invention relates to the field of liquid cooling pump technology, specifically to an electronic water pump dry chamber sealing and stator preload structure. Background Technology

[0002] Electronic water pumps are widely used in automotive cooling circulation systems. They utilize a brushless motor to drive an impeller, increasing liquid pressure and circulating water, coolant, and other media. Electronic pumps are highly integrated electromechanical products, particularly incorporating numerous electronic control components. Through the coordinated operation of these components and the motor, precise control of parameters such as flow rate and head is achieved, enabling accurate cooling of the vehicle and contributing to energy conservation and emission reduction in automotive systems.

[0003] As attached Figure 7 and Figure 8 As shown, existing electronic water pumps typically consist of a pump head (01), a rotor assembly (02), a waterproof sleeve assembly (03), a pump body assembly (04), a stator assembly (05), a control board assembly (06), connectors, and other components (07). Existing electronic water pumps have two working areas: a dry chamber area and a wet chamber area. The interface between the dry and wet chambers is mainly at the liquid contact surface on the inner side of the waterproof sleeve assembly (03). The dry chamber area consists of the pump body assembly, the outer side of the waterproof sleeve, the sealing gasket, the pre-tightening gasket, and the stator assembly, drive board, connectors, and other electrically charged components, protecting the pump's charged parts for normal operation. The wet chamber area consists of the rotor assembly, the pump head, the inner side of the waterproof sleeve, the sealing ring, and the working medium; the working medium is generally a mixture of ethylene glycol and water, which is easily conductive.

[0004] The vehicle-mounted electronic water pump is installed on the vehicle body. As the vehicle body is subjected to alternating vibration and impact loads over a long period of time, typically 8 to 20g, the internal components of the electronic water pump must be able to withstand long-term vibrations without relative movement or deformation that would lead to a decline in performance or function.

[0005] As attached Figure 7 and Figure 8 As shown, currently, electronic water pumps typically address the sealing issues in the dry chamber area and the pre-tightening of the stator assembly using two separate components: the dry chamber sealing ring M02 and the stator pre-tightening gasket Y02. However, current electronic water pumps have numerous structural components and complex assembly processes. The stator pre-tightening gasket needs to be mounted on the waterproof sleeve and then inverted between the stator assembly and the waterproof sleeve, making the entire assembly process complex. Because the stator pre-tightening gasket is inverted during assembly, there is a risk of loosening or even falling off, leading to a failure to pre-tighten the stator and a quality risk. Furthermore, it is prone to falling off during assembly, and there is a high possibility of omissions. These factors result in high costs and low production efficiency for electronic water pumps. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a dry chamber sealing and stator pre-tightening structure for an electronic water pump. This structure not only reduces the number of parts to be assembled and simplifies the assembly process, but also improves the quality and reliability of the assembled product, increases production efficiency, and reduces production costs.

[0007] The technical solution provided by this invention is as follows: a dry chamber sealing and stator pre-tightening structure for an electronic water pump, characterized in that: it includes a pump body assembly, a stator assembly, a waterproof sleeve assembly, and a sealing pre-tightening component; the stator assembly is adapted to be installed on the lower part of the inner wall of the pump body assembly; the stator assembly is sealed to the pump body assembly after being subjected to axial pressure; an integrally formed sealing pre-tightening component is provided at the upper end of the stator assembly; an integrally formed waterproof sleeve assembly is provided at the upper end of the sealing pre-tightening component; the end face of the sealing pre-tightening component is sandwiched between the end face of the waterproof sleeve assembly and the end face of the pump body assembly; the two end faces of the sealing pre-tightening component respectively seal the waterproof sleeve assembly and the pump body assembly after the electronic water pump is locked.

[0008] Preferably, the waterproof sleeve assembly includes a waterproof sleeve body, a sealing end face, a pre-tightening boss, and a liquid contact surface. The lower end of the waterproof sleeve body is provided with sealing end faces spaced apart circumferentially. The sealing end faces are tightly sealed to the end face of the pump body assembly. Multiple pre-tightening bosses are evenly provided on the inner side of the sealing end face, and the end faces of the pre-tightening bosses are flush with the sealing end faces. The inner side of the waterproof sleeve body is provided with a liquid contact surface, and the upper end of the liquid contact surface is sealed to the pump head through a wet cavity sealing ring.

[0009] Preferably, the pump body assembly has multiple sets of inward positioning ribs evenly distributed on its end face, a sealing groove is provided inside the pump body assembly, and multiple sets of outward positioning ribs are evenly distributed on the sealing groove, with the inward positioning ribs and outward positioning ribs being staggered relative to each other.

[0010] Preferably, the sealing pre-tightening component is made of a high-elasticity material with a Shore A hardness of 40-70; the upper end face of the sealing pre-tightening component is provided with an arc-shaped material discharge groove in the center, and the lower end of the sealing pre-tightening component is provided with a positioning groove in the center, the positioning groove being adapted and connected to the upper end face of the pump body assembly.

[0011] Preferably, the thickness of the sealing pre-tightening component is 1-8 mm, the width is 3-15 mm, the height of the positioning groove is 0.5-2 mm, and there is at least a 1 mm distance between the two sides of the positioning groove and the two sides of the sealing pre-tightening component; the radius of the material discharge groove is 3-10 mm, and the distance between the bottom of the material discharge groove and the top of the positioning groove is 0.5-3 mm.

[0012] Preferably, the included angle between the inward positioning rib and the outward positioning rib is 5° to 10°.

[0013] Preferably, the flatness of the sealing groove is less than 0.1 mm and the roughness is less than 3.2.

[0014] Preferably, the inward positioning ribs and the outward positioning ribs position and radially pre-tighten the sealing pre-tightening assembly.

[0015] Preferably, the compression of the sealing pre-tightening component is 10-30%, and the filling rate is 70-90%.

[0016] Preferably, a rotor assembly is adapted to be installed at the lower end of the pump head, and the lower end of the rotor assembly is inserted into the interior of the waterproof sleeve body.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) This invention features a stator assembly fitted to the lower part of the inner wall of the pump body assembly. The stator assembly, under axial pressure, is sealed to the pump body assembly. An integrally formed sealing pre-tightening component is located at the upper end of the stator assembly, and an integrally formed waterproof sleeve assembly is located at the upper end of the sealing pre-tightening component. The end face of the sealing pre-tightening component is sandwiched between the end face of the waterproof sleeve assembly and the end face of the pump body assembly. After the electronic water pump is locked, the two end faces of the sealing pre-tightening component respectively seal the waterproof sleeve assembly and the pump body assembly. This invention has a simple overall structure. The internal structure of the electronic water pump adopts a symmetrical circular ring structure, allowing for direct forward installation during assembly. This enables rapid assembly of the sealing pre-tightening component, facilitating automated production, improving the assembly efficiency of the electronic water pump, and ensuring product consistency. It effectively achieves dry chamber sealing and stator pre-tightening functions, guaranteeing stable operation of the electronic water pump in harsh environments such as high vibration, humidity, and water content.

[0019] (2) The present invention eliminates the need for stator preload pads required for the assembly of electronic water pumps in the prior art, shortens the length of the electronic water pump, reduces the volume of the electronic water pump, and can achieve excellent internal sealing effect of the electronic water pump. It can also effectively improve the sealing and stator preload reliability of the electronic water pump, save on product parts and mold investment, and reduce product production costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle.

[0022] Figure 3 This is a schematic diagram of the pump body assembly structure of the present invention.

[0023] Figure 4 This is a schematic diagram of the stator assembly structure of the present invention.

[0024] Figure 5 This is a schematic diagram of the sealing pre-tightening assembly of the present invention.

[0025] Figure 6 For the present invention Figure 5 A sectional view.

[0026] Figure 7 This is a schematic diagram of the structure of an electronic water pump in the prior art.

[0027] Figure 8 for Figure 7 Enlarged view of point B. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] like Figures 1 to 6 As shown, an electronic water pump dry chamber sealing and stator pre-tightening structure includes a pump body assembly 1, a stator assembly 2, a waterproof sleeve assembly 3, a sealing pre-tightening component 4, a waterproof sleeve body 5, a sealing end face 6, a pre-tightening boss 7, a liquid contact surface 8, a pump head 9, a wet chamber sealing ring 10, an inward positioning rib 11, a sealing groove 12, an outward positioning rib 13, a discharge groove 14, a positioning groove 15, a rotor assembly 16, a control board 17, and a connector 18.

[0030] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] like Figures 1 to 6As shown, a stator assembly 2 is fitted onto the lower part of the inner wall of the pump body assembly 1. The stator assembly 2, under axial pressure, is sealed to the pump body assembly 1. An integrally formed sealing pre-tightening component 4 is located at the upper end of the stator assembly 2. An integrally formed waterproof sleeve assembly 3 is located at the upper end of the sealing pre-tightening component 4. The end face of the sealing pre-tightening component 4 is sandwiched between the end face of the waterproof sleeve assembly 3 and the end face of the pump body assembly 1. After the electronic water pump is locked, the two end faces of the sealing pre-tightening component 4 respectively seal the waterproof sleeve assembly 3 and the pump body assembly 1. The pump body assembly 1, waterproof sleeve assembly 3, and sealing pre-tightening component 4 combine to form a sandwich-like structure. When the electronic water pump locks the screws, the sealing end face 6 of the waterproof sleeve assembly 3 adheres tightly to the end face of the pump body assembly 1, while the end face of the sealing pre-tightening component 4 is compressed, achieving dry chamber sealing and stator pre-tightening.

[0033] The waterproof sleeve assembly 3 includes a waterproof sleeve body 5, a sealing end face 6, a pre-tightening boss 7, and a liquid contact surface 8. The lower end of the waterproof sleeve body 5 is provided with sealing end faces 6 at intervals around the periphery. The sealing end faces 6 are tightly sealed to the end face of the pump body assembly 1. Multiple pre-tightening bosses 7 are evenly provided on the inner side of the sealing end face 6. The end face of the pre-tightening boss 7 is flush with the sealing end face 6. The inner side of the waterproof sleeve body 5 is provided with a liquid contact surface 8. The upper end of the liquid contact surface 8 is sealed to the pump head 9 through a wet cavity sealing ring 10. The lower end of the pump head 9 is fitted with a rotor assembly 16, and the lower end of the rotor assembly 16 is inserted into the interior of the waterproof sleeve body 5.

[0034] Multiple sets of inward positioning ribs 11 are evenly distributed on the end face of the pump body assembly 1. A sealing groove 12 is provided inside the pump body assembly 1, and multiple sets of outward positioning ribs 13 are evenly distributed on the sealing groove 12. The inward positioning ribs 11 and the outward positioning ribs 13 are staggered relative to each other. Specifically, the included angle between the inward positioning ribs 11 and the outward positioning ribs 13 is 5° to 10°. The inner flatness of the sealing groove 12 is less than 0.1 mm, and the roughness is less than 3.2. The inward positioning ribs 11 and the outward positioning ribs 13 position and radially pre-tighten the sealing pre-tightening component 4.

[0035] During assembly or use, after the stator assembly 2 is assembled onto the pump body assembly 1 and a certain axial pressure is applied to tighten it, the upper end face of the stator assembly 2 is the pre-tightening force surface and is basically on the same horizontal plane as the bottom of the sealing groove 12 of the pump body assembly 1, ensuring uniform sealing and tightening force.

[0036] The sealing pre-tightening component 4 is made of a high-elasticity material with a Shore A hardness of 40-70. An arc-shaped material discharge groove 14 is centrally located on the upper end face of the sealing pre-tightening component 4, and a positioning groove 15 is centrally located on the lower end face of the sealing pre-tightening component 4. The positioning groove 15 is adapted to and connected to the upper end face of the pump body assembly 1. Specifically, in this embodiment, the thickness h of the sealing pre-tightening component 4 is 1-8 mm, the width b is 3-15 mm, the height h1 of the positioning groove 15 is 0.5-2 mm, and there is at least a 1 mm distance between the two sides of the positioning groove 15 and the two sides of the sealing pre-tightening component 4; the radius R of the material discharge groove 14 is 3-10 mm, and the distance t between the bottom of the material discharge groove 14 and the top of the positioning groove 15 is 0.5-3 mm; the compression amount of the sealing pre-tightening component 4 is 10-30%, and the filling rate is 70-90%. The sealing pre-tightening assembly 4, manufactured with relevant parameters within this range, can better achieve an effective sealing connection between the pump body assembly 1, stator assembly 2, and waterproof sleeve assembly 3. It eliminates the need for the stator pre-tightening gasket required in existing electronic water pump assemblies, shortening the length and reducing the volume of the electronic water pump. It also achieves excellent internal sealing, effectively improving the reliability of the sealing and stator pre-tightening, saving on product parts and mold investment, and reducing product production costs.

[0037] The lower end of the pump body assembly 1 is provided with a connector 18, and a control board 17 is provided inside the connector 18.

[0038] This invention features a simple and compact overall structure. The internal structure of the electronic water pump adopts a symmetrical circular ring structure, allowing for direct forward installation during assembly. This enables rapid assembly of the sealing pre-tightening component 4, facilitating automated production, improving assembly efficiency, and ensuring product consistency. It effectively achieves dry chamber sealing and stator pre-tightening functions, guaranteeing stable operation of the electronic water pump in harsh environments such as high vibration, humidity, and water content. It eliminates the need for the stator pre-tightening pad required in existing electronic water pump assembly technologies, shortening the pump's length and reducing its volume while achieving excellent internal sealing.

[0039] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any modifications, equivalent changes, improvements, etc., made in accordance with the claims of the present invention shall still fall within the scope of the present invention.

Claims

1. A dry chamber sealing and stator pre-tightening structure for an electronic water pump, characterized in that: The system includes a pump body assembly (1), a stator assembly (2), a waterproof sleeve assembly (3), and a sealing pre-tightening component (4). The stator assembly (2) is fitted onto the lower part of the inner wall of the pump body assembly (1). The stator assembly (2) is sealed to the pump body assembly (1) after being subjected to axial pressure. An integrally formed sealing pre-tightening component (4) is provided at the upper end of the stator assembly (2). An integrally formed waterproof sleeve assembly (3) is provided at the upper end of the sealing pre-tightening component (4). The end face of the waterproof sleeve assembly (3) is flush with the pump body assembly (1). The end faces of the sealing pre-tightening component (4) are sandwiched between the end faces of the pump body assembly (1). After the electric water pump is locked, the two end faces of the sealing pre-tightening component (4) respectively seal the waterproof sleeve assembly (3) and the pump body assembly (1). The waterproof sleeve assembly (3) includes a waterproof sleeve body (5), a sealing end face (6), a pre-tightening boss (7) and a liquid contact surface (8). The lower end of the waterproof sleeve body (5) is provided with sealing end faces (6) spaced apart circumferentially. The sealing end faces (6) are tightly sealed to the end face of the pump body assembly (1). Multiple pre-tightening protrusions (7) are evenly provided on the inner side of the end face (6), and the end face of the pre-tightening protrusions (7) is flush with the sealing end face (6); a liquid contact surface (8) is provided on the inner side of the waterproof sleeve body (5), and the upper end of the liquid contact surface (8) is sealed to the pump head (9) through a wet cavity sealing ring (10); multiple sets of inward positioning ribs (11) are evenly distributed on the end face of the pump body assembly (1), and a sealing groove (12) is provided in the pump body assembly (1), and multiple sets of outward positioning ribs are evenly distributed on the sealing groove (12). The inner positioning rib (11) and the outer positioning rib (13) are staggered relative to each other; the included angle between the inner positioning rib (11) and the outer positioning rib (13) is 5°~10°; the inner flatness of the sealing groove (12) is less than 0.1mm and the roughness is less than 3.2; the inner positioning rib (11) and the outer positioning rib (13) position and radially pre-tighten the sealing pre-tightening assembly (4); the material of the sealing pre-tightening assembly (4) is a high elastic body with a Shore A hardness of 40~70; the upper end face of the sealing pre-tightening assembly (4) is provided with an arc-shaped material discharge groove (14) in the center, and the lower end of the sealing pre-tightening assembly (4) is provided with a positioning groove (15) in the center, and the positioning groove (15) is adapted to and connected to the upper end face of the pump body assembly (1).

2. The dry chamber sealing and stator preload structure for an electronic water pump according to claim 1, characterized in that: The thickness of the sealing pre-tightening component (4) is 1~8mm, the width is 3~15mm, the height of the positioning groove (15) is 0.5~2mm, and there is at least a 1mm distance between the two sides of the positioning groove (15) and the two sides of the sealing pre-tightening component (4); the radius of the material removal groove (14) is 3~10mm, and the distance between the bottom of the material removal groove (14) and the top of the positioning groove (15) is 0.5~3mm.

3. The dry chamber sealing and stator preload structure for an electronic water pump according to claim 2, characterized in that: The compression of the sealing pre-tightening component (4) is 10-30%, and the filling rate is 70-90%.

4. The dry chamber sealing and stator preload structure for an electronic water pump according to claim 3, characterized in that: The lower end of the pump head (9) is fitted with a rotor assembly (16), and the lower end of the rotor assembly (16) is inserted into the interior of the waterproof sleeve body (5).

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