A dynamic sealing gasket and its thermal management control valve

Abstract

This invention relates to the field of automotive thermal management technology, and more particularly to a dynamic seal gasket and its thermal management control valve, comprising a dynamic seal gasket body, a positioning groove provided on the dynamic seal gasket body, and an elastic connector provided at the outer end of the positioning groove. The elastic connector forms a seal with the valve core and the housing. By changing the through structure of the positioning groove and adding a sealing area at the end, a complete seal is formed between the valve core and the end of the dynamic seal gasket, preventing coolant in the inner cavity from entering the end cover cavity, thereby avoiding coolant leakage from the end cover weld and shaft seal, which would cause product defects.

Description

Technical Field

[0001] This invention relates to the field of automotive thermal management technology, and more particularly to dynamic gaskets and their thermal management control valves. Background Technology

[0002] Thermal management control valves are crucial actuators in automotive thermal management systems. The thermal management control valves used in the thermal management integration modules of new energy vehicles consist of components such as a housing, valve core, dynamic seal gasket, sealing gasket, shaft seal assembly, and end cap. The dynamic sealing gasket includes a positioning groove, a positioning hole, and a through hole, with the positioning groove being axially continuous. The coolant in the inner cavity contacts the end cover and shaft seal assembly through this continuous structure. However, after the product is welded, poor welding can easily lead to leakage. Therefore, it is necessary to study a structure to reduce the scrap rate of the product and improve its performance. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a dynamic sealing gasket and its thermal management control valve.

[0004] The present invention is achieved through the following technical solution: a dynamic sealing gasket, comprising a dynamic sealing gasket body, wherein a positioning groove is provided on the dynamic sealing gasket body, and an elastic connector is provided at the outer end of the positioning groove, wherein the elastic connector forms a seal with the valve core and the housing.

[0005] Furthermore, a guide plate is provided on the dynamic sealing gasket body at the edge of the positioning groove, and a positioning post that cooperates with the positioning groove is provided on the housing. The side of the positioning post is provided with a guide groove that cooperates with the guide plate, and the guide plate can slide inward along the guide groove.

[0006] Furthermore, the guide plate and the guide groove are connected by an interference fit.

[0007] Furthermore, the dynamic sealing gasket body is provided with an assembly and shaping structure that cooperates with the positioning post. During the assembly process, the inner ends of the guide pieces are brought closer to each other through the assembly and shaping structure.

[0008] Furthermore, the assembly and shaping structure includes a narrowing structure disposed at the lower end of the guide plate.

[0009] Furthermore, the assembly and shaping structure includes an elastic connector two disposed between the lower ends of the guide plates, which is pulled apart during the assembly process.

[0010] Furthermore, the second elastic connector is an elastic cable integrally formed with the dynamic sealing gasket body.

[0011] Furthermore, a guide opening is provided at the inner end of the guide piece.

[0012] Furthermore, a sealing rib is provided on one end face of the elastic connector facing the housing.

[0013] A thermal management control valve includes a housing and a valve core, wherein a dynamic sealing gasket is disposed between the housing and the valve core.

[0014] The beneficial effects of this invention are as follows: 1. Change the through structure of the positioning groove and add a sealing area at the end to make the valve core and the end of the dynamic sealing gasket form a complete seal, so that the coolant in the inner cavity cannot enter the end cover cavity, thereby avoiding the leakage of coolant from the end cover weld and shaft seal, which would cause product defects. 2. By connecting the upper area of ​​the dynamic seal gasket, the overall strength of the dynamic seal gasket is increased, which is beneficial to the installation and service life of the dynamic seal gasket; 3. Eliminate the end cap welding process. Since the optimized dynamic sealing gasket and valve core have formed a complete seal, coolant cannot enter the end cap cavity. Therefore, the end cap does not need to be welded for sealing. Other processes such as clips or glue can be used to fix the end cap, reducing the installation process and lowering costs. 4. Eliminate the end cover welding process. Since the optimized dynamic seal gasket and valve core have formed a complete seal, coolant cannot enter the end cover cavity. Therefore, the shaft seal assembly can be eliminated, reducing installation processes and sub-parts, and lowering costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of Example 1; Figure 2 This is a schematic diagram of the shell structure; Figure 3 This is a schematic diagram showing the connection relationship between the dynamic sealing gasket and the valve core; Figure 4 This is a schematic diagram of the dynamic sealing gasket structure in Example 2; Figure 5 This is a schematic diagram of the thermal management control valve.

[0016] The components are: 1. Housing; 101. Positioning pin; 2. Driver; 3. Dynamic sealing gasket body; 301. Positioning groove; 302. Elastic connector one; 303. Sealing rib; 304. Guide plate; 305. Guide port; 306. Elastic connector two; 4. Valve core; 5. End cover. Detailed Implementation

[0017] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1 like Figure 1-3 As shown, a dynamic sealing gasket is used in the thermal management control valve of an electric vehicle. It includes a dynamic sealing gasket body 3, which is made of EPDM material. The surface of the dynamic sealing gasket body 3 facing the valve core 4 is the dynamic sealing surface. The dynamic sealing surface is composited with a dynamic sealing layer made of PTFE material, which has high sealing and wear resistance performance.

[0020] The dynamic sealing gasket body 3 has an integrally formed positioning groove 301, and the housing 1 has an integrally formed positioning post 101 that cooperates with the positioning groove 301. In this embodiment, an elastic connector 302 is integrally formed at the outer end of the positioning groove 301. The height of the elastic connector 302 is 3-5mm, and a transverse sealing rib 303 is integrally formed on the end face of the elastic connector 302 facing the housing 1. This can ensure the deformation resistance of the elastic connector 302 and the sealing performance between the elastic connector 302 and the housing 1 and the valve core 4. The sealing rib 303 is connected to the sealing rib on the dynamic sealing gasket body 3, which facilitates mold opening and reduces leakage.

[0021] Due to the design of the elastic connector 302, the dynamic seal gasket is cylindrical before installation and can be directly inserted into the housing 1 without additional curling. However, this increases the precision requirements of the robotic arm. To better insert the positioning pin 101 into the positioning groove 301, the width of the positioning groove 301 is increased by 1mm in this application. Tests show that the installation success rate of the dynamic seal gasket increases, but coolant leaks outward from the gap between the positioning groove 301 and the positioning pin 101, leading to increased pressure inside the elastic connector 302 and increased pressure between the elastic connector 302 and the housing 1 and valve core 4. The sealing stability deteriorates. In this embodiment, a guide plate 304 is integrally formed on the dynamic sealing gasket body 3 at the edge of the positioning groove 301, and a guide groove that cooperates with the guide plate 304 is integrally formed on the side of the positioning post 101. The guide groove depth is 1.5mm. The guide plate 304 can slide inward along the guide groove, thereby reducing the gap. The guide plate 304 and the guide groove are connected by an interference fit. During the assembly process, the elasticity of the guide plate 304 itself is used to make the guide plate 304 slide inward along the guide groove by compression, which can not only improve the sealing performance, but also improve the positioning effect of the dynamic sealing gasket body 3.

[0022] During testing, it was also discovered that due to the interference fit between the guide plate 304 and the guide groove, if the extrusion speed is too high during the inward compression of the dynamic sealing gasket, the lower end of the guide plate 304 may detach from the guide groove. Therefore, the dynamic sealing gasket body 3 has an assembly and shaping structure that mates with the positioning post 101. During assembly, the narrowing structure brings the inner ends of the guide plates 304 closer together. Specifically, the assembly and shaping structure includes a narrowing structure integrally formed at the lower end of the guide plate 304. In this embodiment, the width value near the lower end of the two guide plates 304 is smaller than the width value near the upper end, thereby forming... The structure is constricted, and the difference between the maximum and minimum width values ​​between the two guide plates 304 is 1-2mm. During the process of the dynamic sealing gasket body 3 moving towards the inner end of the housing 1, the guide plate 304 near the inner end exerts a large extrusion force into the guide groove. After assembly, due to the interference fit between the guide plate 304 and the guide groove, the sealing performance between the positioning groove 301 and the positioning post 101 is guaranteed. In addition, the extrusion of the guide groove on the guide plate 304 causes the dynamic sealing gasket body 3 near the guide plate 304 to be deformed by force, thereby forming an arc and reducing the scraping between the dynamic sealing gasket and the valve core 4 at this point.

[0023] After designing the narrowing structure, the inner opening of the positioning groove 301 is reduced in the early stage of assembly, which reduces the success rate of installation. In this application, a guide port 305 is integrally formed in the inner end of the guide plate 304. The guide port 305 has a structure with a large inner opening and a small outer opening. In the early stage of assembly, the guide port 305 guides the guide, thereby enabling the guide groove and the guide post to be quickly aligned.

[0024] The dynamic sealing gasket provided in this embodiment is installed in the thermal management control valve, such as... Figure 5 As shown, the device includes a housing 1 and a valve core 4. The valve core 4 is connected to a driver 2, which is a motor assembly used to drive the valve core 4. A dynamic sealing gasket is provided between the housing 1 and the valve core 4. The through structure of the positioning groove 301 is changed, and a sealing area is added to the end, so that the valve core 4 and the end of the dynamic sealing gasket form a complete seal, preventing the coolant in the inner cavity from entering the end cover 5 cavity. This avoids product defects caused by coolant leakage from the weld and shaft seal of the end cover 5. Moreover, by connecting the upper area of ​​the dynamic sealing gasket, the overall strength of the dynamic sealing gasket is increased, which is beneficial to the installation and service life of the dynamic sealing gasket. The welding process of the end cover 5 can be eliminated. Since the optimized dynamic sealing gasket and the valve core 4 have formed a complete seal, the coolant cannot enter the end cover 5 cavity. Therefore, the end cover 5 does not need to be welded and sealed. Other processes such as clips or glue can be used to fix the end cover 5, reducing the installation process and reducing costs. In addition, the welding process of end cover 5 is eliminated. Since the optimized dynamic sealing gasket and valve core 4 have formed a complete seal, coolant cannot enter the cavity of end cover 5. Therefore, the shaft seal assembly can be eliminated, reducing the installation process and sub-parts, and lowering costs.

[0025] Example 2 like Figure 4 As shown, a dynamic sealing gasket, unlike Embodiment 1, includes an elastic connector 306 distributed between the lower ends of the guide pieces 304 in its assembly and shaping structure. During assembly, the elastic connector 306 is broken. Specifically, the elastic connector 306 is an elastic cable integrally formed with the sealing gasket body. The outer diameter of the elastic cable is 1 mm, and no constriction structure is required. During the process of inwardly pressing the dynamic sealing gasket, the elastic cable is gradually stretched until it breaks. In this process, it can provide inward pulling force, causing the lower end of the guide piece 304 to be pressed into the guide groove. After breaking, it is pressed into the guide groove.

[0026] Tests revealed that due to the small outer diameter of the elastic cable, defects are prone to occur during the molding process, leading to direct breakage or breakage in the early stages of assembly. In some embodiments, 2-4 elastic cables can be designed along the length of the positioning groove 301, and the outer diameter of the cable cannot exceed 1.5mm.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dynamic sealing gasket, comprising a dynamic sealing gasket body, wherein the dynamic sealing gasket body is provided with a positioning groove, characterized in that, An elastic connector is provided at the outer end of the positioning groove, and the elastic connector forms a seal with the valve core and the housing.

2. The dynamic sealing gasket according to claim 1, characterized in that, A guide plate is provided on the dynamic sealing gasket body at the edge of the positioning groove, and a positioning post is provided on the housing to cooperate with the positioning groove. A guide groove is provided on the side of the positioning post to cooperate with the guide plate, and the guide plate can slide inward along the guide groove.

3. The dynamic sealing gasket according to claim 2, characterized in that, The guide plate and the guide groove are connected by an interference fit.

4. The dynamic sealing gasket according to claim 3, characterized in that, The dynamic sealing gasket body is provided with an assembly and shaping structure that cooperates with the positioning post. During the assembly process, the inner ends of the guide pieces are brought closer to each other through the assembly and shaping structure.

5. The dynamic sealing gasket according to claim 4, characterized in that, The assembly and shaping structure includes a narrowing structure located at the lower end of the guide plate.

6. The dynamic sealing gasket according to claim 4, characterized in that, The assembly and shaping structure includes an elastic connector two disposed between the lower ends of the guide plates, which is broken during the assembly process.

7. The dynamic sealing gasket according to claim 6, characterized in that, The second elastic connector is an elastic cable integrally formed with the sealing gasket body.

8. The dynamic sealing gasket according to claim 2, characterized in that, The inner end of the guide plate is provided with a guide opening.

9. The dynamic sealing gasket according to claim 1, characterized in that, A sealing rib is provided on one end face of the elastic connector facing the shell.

10. A thermal management control valve, comprising a housing and a valve core, characterized in that, A dynamic sealing gasket as described in any one of claims 1-9 is provided between the housing and the valve core.

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