Valve element and filling valve

Abstract

The utility model discloses a valve core and a filling valve, and belongs to the technical field of gas filling devices, the valve core comprises a core body and a sealing assembly, and the sealing assembly comprises a first sealing ring and a second sealing ring; a first sealing groove and a second sealing groove are formed in the outer side face of the core body, the first sealing groove and the second sealing groove are both annular, and an annular sealing table is formed between the first sealing groove and the second sealing groove; the first sealing ring is located in the first sealing groove, and the second sealing ring is located in the second sealing groove. The filling valve comprises a valve body and the valve element. The valve body is provided with a valve body inner cavity, and the valve body inner cavity is provided with a second sealing face. The valve element is located in an inner cavity of the valve body, and the first sealing ring and the second sealing ring are both attached to and sealed with the second sealing face. Two seals are formed between the valve element and the valve body through the first sealing ring and the second sealing ring, the sealing stability is improved, the resistance performance is improved, the stability of the filling valve in the high-pressure and vibration environment is enhanced, and the situation of refrigerant leakage is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of inflation devices, and particularly relates to a valve core and a filling valve. Background Art

[0002] As a major air compressor production base in the world, in recent years, benefited from the rapid development of the economy and the automotive industry, the automotive air-conditioning industry in China has also achieved rapid development. The structural stability and energy conservation and emission reduction of automotive air-conditioning have become the main future development trends.

[0003] At present, the global greenhouse effect is intensifying, and the leakage of automotive air-conditioning refrigerant has a great boosting effect on the greenhouse effect. Therefore, higher requirements are put forward for the sealing effect of automotive air-conditioning seals; the repeated filling of refrigerant also puts forward higher requirements for the effectiveness of seals in repeated use, and the effectiveness of existing automotive air-conditioning seals cannot reach an ideal state when used repeatedly.

[0004] It can be seen that improving the sealing performance of automotive refrigeration systems is a very necessary research direction. Summary of the Utility Model

[0005] Regarding the problems existing in the prior art, the utility model provides a valve core and a filling valve, which improve the sealing structure of the valve core and the valve body, can ensure the sealing stability of the filling valve under the conditions of repeated refrigerant filling, high pressure and vibration, and improve the refrigerant leakage problem.

[0006] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0007] On the one hand, the utility model provides a valve core, which includes a core body and also includes a sealing component for forming a seal between the core body and the valve body;

[0008] The sealing component includes a first sealing ring and a second sealing ring;

[0009] The outer side surface of the core body is provided with a first sealing groove and a second sealing groove, both the first sealing groove and the second sealing groove are annular, and an annular sealing platform is formed between the first sealing groove and the second sealing groove;

[0010] The first sealing ring is located in the first sealing groove, and the second sealing ring is located in the second sealing groove.

[0011] In the above-mentioned valve core, the core body integrally forms the sealing platform;

[0012] And / or, the width of the sealing platform is 0.4 - 0.7 mm;

[0013] And / or, the center distance between the first sealing ring and the second sealing ring is 2.1 - 2.5 mm.

[0014] In one of the above-mentioned valve cores, the materials of the first sealing ring and the second sealing ring are different.

[0015] In one of the above-mentioned valve cores, the material of the first sealing ring is nitrile rubber, and the material of the second sealing ring is fluororubber.

[0016] In one of the above-mentioned valve cores, the core body is further provided with a first transition surface and / or a second transition surface, and both the first transition surface and the second transition surface are cylindrical surfaces;

[0017] The second transition surface and the sealing platform are respectively located on both sides of the second sealing groove;

[0018] The first transition surface and the sealing platform are respectively located on both sides of the first sealing groove.

[0019] In one of the above-mentioned valve cores, the axial length ranges of both the first transition surface and the second transition surface are 0.2 - 0.5 mm.

[0020] In one of the above-mentioned valve cores, the core body is further provided with a first sealing surface; in the flow direction of the refrigerant, the first sealing surface is located on the upstream side of the sealing assembly.

[0021] In one of the above-mentioned valve cores, the core body is further provided with a first connecting surface for connecting with the valve body; in the flow direction of the refrigerant, the first connecting surface is located on the downstream side of the sealing assembly.

[0022] On the other hand, the present invention provides a charging valve, including a valve body and the above-mentioned valve core; the valve body has a valve body cavity, and the valve body cavity is provided with a second sealing surface; the valve core is located in the valve body cavity, and both the first sealing ring and the second sealing ring are in contact with and sealed to the second sealing surface.

[0023] In one of the above-mentioned charging valves, the valve body cavity is further provided with a guiding surface and a second connecting surface. In the flow direction of the refrigerant, the guiding surface is located on the upstream side of the second sealing surface, and the second connecting surface is located on the downstream side of the second sealing surface.

[0024] The beneficial effects of the present invention are shown as follows:

[0025] Two seals are formed between the valve core and the valve body through the first sealing ring and the second sealing ring, increasing the sealing stability and the resistance performance, strengthening the stability of the charging valve in a high-pressure and vibration environment, and avoiding the situation of refrigerant leakage caused by the sealing failure or loosening under repeated refrigerant charging, high pressure, and vibration.

[0026] By reasonably setting the center distance between the first sealing ring and the second sealing ring, it is ensured that the space between the first sealing ring and the second sealing ring is airtight after the valve core is placed in the valve body, effectively preventing impurities from entering during the process of twisting the valve core into the valve body;

[0027] There is a sealing platform between the first sealing ring and the second sealing ring. The sealing platform separates the first sealing ring and the second sealing ring, which can not only ensure that the extrusion deformation of the first sealing ring and the second sealing ring does not interfere with each other, but also ensure the sealing stability of the first sealing ring and the second sealing ring;

[0028] The structures of the valve core and the valve body of the charging valve are reasonable, which can not only avoid the influence of debris generated during the assembly of the two on the seal, but also avoid the influence of impurities in the refrigerant on the seal; at the same time, the effective contact area between the two increases, increasing the friction force, making the charging valve have better anti-twisting characteristics, and significantly improving the anti-seismic and anti-loosening characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the valve core of the present invention;

[0030] Figure 2 It is a cross-sectional view of the core body in the valve core of the present invention;

[0031] Figure 3 It is a schematic diagram of the overall structure of an embodiment of the charging valve of the present invention;

[0032] Figure 4 It is Figure 3 a partial enlarged view of area A in

[0033] In the figure:

[0034] 100 - spring;

[0035] 200 - core body; 201 - first connection surface; 202 - first transition surface; 203 - first sealing groove; 204 - sealing platform; 205 - second sealing groove; 206 - second transition surface; 207 - first sealing surface;

[0036] 300 - sealing gasket; 400 - first sealing ring; 500 - core rod; 600 - second sealing ring;

[0037] 700 - valve body; 701 - guiding surface; 702 - second sealing surface; 703 - second connection surface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0039] In the first aspect, please refer to Figure 1, which is an embodiment of a valve core provided by the present utility model, includes a core body 200, a spring 100, a sealing gasket 300, a core rod 500 and a sealing assembly; wherein, a fluid passage is formed inside the core body 200, the core rod 500 is slidably arranged in the fluid passage of the core body 200, the spring 100 and the sealing gasket 300 are respectively sleeved at both ends of the core rod 500, and the elastic acting force of the spring 100 is used to maintain the sealing gasket 300 to block the output end of the fluid passage. The assembly relationship, action process and principle of the core body 200, the core rod 500, the sealing gasket 300 and the spring 100 are all prior arts and will not be described in detail here.

[0040] The improvement of this application lies in the sealing assembly, and the sealing assembly forms a seal between the core body 200 and the valve body 700; different from the prior art, the sealing assembly includes a first sealing ring 400 and a second sealing ring 600. Please refer to Figure 2 , a first sealing groove 203 and a second sealing groove 205 are provided on the outer side surface of the core body 200, and both the first sealing groove 203 and the second sealing groove 205 are annular, that is, they extend in the entire circumference of the core body 200; an annular sealing platform 204 is formed between the first sealing groove 203 and the second sealing groove 205. Among them, the first sealing ring 400 is located in the first sealing groove 203, and the second sealing ring 600 is located in the second sealing groove 205; when the valve core is installed into the valve inner cavity of the valve body 700, the first sealing ring 400 and the second sealing ring 600 will be squeezed to generate elastic deformation, and the first sealing ring 400 and the second sealing ring 600 are separated by the sealing platform 204, preventing the extrusion deformation of the first sealing ring 400 and the second sealing ring 600 from interfering with each other and affecting the risk of affecting the sealing performance. The first sealing ring 400 and the second sealing ring 600 form two seals between the core body 200 and the valve body 700, which not only increases the sealing stability and effectively improves the slow leakage condition of the filling valve; but also increases the effective contact area between the valve core and the valve body 700 and improves the assembly stability.

[0041] The first sealing groove 203 and the second sealing groove 205 can be processed separately, and after one milling is completed, the other one is processed; the sealing platform 204 is formed after milling the first sealing groove 203 and the second sealing groove 205. At this time, the sealing platform 204 and the core body 200 are of an integral structure. It is also possible to connect the first sealing groove 203 and the second sealing groove 205 when processing them and complete them in the same process; the sealing platform 204 is assembled on the core body 200 in a subsequent process to separate the first sealing groove 203 and the second sealing groove 205. No matter which structural form, the width W2 of the sealing platform 204 is preferably 0.4 - 0.7 mm, which can not only ensure that the first sealing ring 400 and the second sealing ring 600 will not interfere with each other after extrusion deformation, but also ensure the sealing stability of the first sealing ring 400 and the second sealing ring 600.

[0042] The materials of the first sealing ring 400 and the second sealing ring 600 can be selected according to the temperature, pressure, etc. of the application environment of the charging valve. Preferably, the first sealing ring 400 and the second sealing ring 600 use different materials. Since the thermal expansion coefficients of different materials are different, the first sealing ring 400 and the second sealing ring 600 can respectively meet the sealing requirements at different temperatures, and then adapt to the thermal and cold changes during the use of the charging valve to ensure the sealing effect at different temperatures. For example, the material of the first sealing ring 400 is nitrile rubber, and the material of the second sealing ring 600 is fluororubber.

[0043] Furthermore, the central distance L1 between the first sealing ring 400 and the second sealing ring 600 is maintained within the dimension of 2.1 - 2.5 mm. During the assembly process of the core body 200 and the valve body 700, the first sealing ring 400 is pushed and closely attached to the upstream side wall of the first sealing groove 203, and the second sealing ring 600 is also pushed and closely attached to the upstream side wall of the second sealing groove 205. At the same time, the first sealing ring 400 and the second sealing ring 600 are extruded to generate deformation. The deformation of the first sealing ring 400 and the second sealing ring 600 can seal the space between the two, thereby effectively preventing impurities from entering during the process of the core body 200 being twisted into the valve body 700.

[0044] Since the length of the core body 200 is fixed, in order to ensure the installation and setting of the first sealing ring 400 and the second sealing ring 600, the core body 200 is also provided with a first transition surface 202 and a second transition surface 206. Both the first transition surface 202 and the second transition surface 206 are cylindrical surfaces. Among them, the second transition surface 206 and the sealing platform 204 are respectively located on the opposite sides of the second sealing groove 205, and the first transition surface 202 and the sealing platform 204 are respectively located on the opposite sides of the first sealing groove 203. The first transition surface 202 and the second transition surface 206 respectively cooperate with the first sealing ring 400 and the second sealing ring 600 for sealing. Preferably, the axial length W4 of the first transition surface 202 and the axial length W3 of the second transition surface 206 range from 0.2 - 0.5 mm, taking into account both the sealing effect and the size of the core body 200.

[0045] The core body 200 is also provided with a first sealing surface 207 and a first connecting surface 201. The first sealing surface 207 and the first connecting surface 201 are respectively located at both ends of the core body 200. In the flow direction of the refrigerant, the first sealing surface 207 is located on the upstream side of the first connecting surface 201. The first sealing surface 207 is connected to the second transition surface 206, and the first connecting surface 201 is connected to the first transition surface 202.

[0046] The first connecting surface 201 is used to connect with the valve body 700, such as interference fit; but preferably, the first connecting surface 201 is provided with an external thread.

[0047] The first sealing surface 207 is a conical surface, and the end connecting with the second transition surface 206 is the small end; it can not only position the valve core, but also form a seal with the inner cavity of the valve body 700 of the valve body.

[0048] A charging valve, please refer to Figure 3 and Figure 4 , including a valve body 700 and the above-mentioned valve core. The valve body 700 has an inner cavity of the valve body, and the inner cavity of the valve body is provided with a guiding surface 701, a second sealing surface 702 and a second connecting surface 703 that are connected in sequence; the guiding surface 701 is a conical surface, and its small end is connected to the second sealing surface 702; the second sealing surface 702 is a cylindrical surface; the second connecting surface 703 is also a cylindrical surface, and the inner diameter of the second connecting surface 703 is smaller than the inner diameter of the second sealing surface 702; the second connecting surface 703 is provided with a thread.

[0049] The first connecting surface 201 of the core body 200 is threadedly connected to the second connecting surface 703; the first sealing ring 400 and the second sealing ring 600 are in contact with the second sealing surface 702 to form two seals. In the refrigerant flow direction of the charging valve, the first sealing surface 207 is located on the upstream side of the second sealing groove 205, the first connecting surface 201 is located on the downstream side of the first sealing groove 203, and the first sealing ring 400 is located on the downstream side of the second sealing ring 600.

[0050] As Figure 4 shown, when the core body 200 and the valve body 700 are assembled, the first connecting surface 201 is first tightened and connected to the second connecting surface 703; the debris and impurities generated during the tightening process are blocked on the downstream side of the first sealing ring 400; after the first sealing ring 400 and the second sealing ring 600 are in contact with the second sealing surface 702 for sealing, a good seal is formed between the first sealing ring 400 and the second sealing ring 600 to avoid slow leakage; the first sealing surface 207 is in contact with the guiding surface 701 to also form a seal to avoid impurities falling on the second sealing ring 600 of the core body 200; at the same time, the contact area between the core body 200 and the valve body 700 increases, increasing the frictional force, making the charging valve have better anti-twist characteristics and improving the anti-seismic and anti-loosening characteristics of the product structure in a high-pressure environment.

[0051] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A valve core, comprising a core body (200), characterized in that, It further includes a sealing assembly for forming a seal between the core body (200) and the valve body (700); The sealing assembly includes a first sealing ring (400) and a second sealing ring (600); The outer side surface of the core body (200) is provided with a first sealing groove (203) and a second sealing groove (205). Both the first sealing groove (203) and the second sealing groove (205) are annular, and an annular sealing platform (204) is formed between the first sealing groove (203) and the second sealing groove (205); The first sealing ring (400) is located in the first sealing groove (203), and the second sealing ring (600) is located in the second sealing groove (205).

2. The spool according to claim 1, wherein The core body (200) integrally forms the sealing platform (204); and / or, the width of the sealing platform (204) is 0.4 - 0.7 mm; and / or, the center distance between the first sealing ring (400) and the second sealing ring (600) is 2.1 - 2.5 mm.

3. A valve core according to claim 1, characterized in that, The materials of the first sealing ring (400) and the second sealing ring (600) are different.

4. A valve core according to claim 3, characterized in that, The material of the first sealing ring (400) is nitrile rubber, and the material of the second sealing ring (600) is fluororubber.

5. A valve core according to claim 1, characterized in that, The core body (200) is further provided with a first transition surface (202) and / or a second transition surface (206), and both the first transition surface (202) and the second transition surface (206) are cylindrical surfaces; The second transition surface (206) and the sealing platform (204) are respectively located on both sides of the second sealing groove (205); The first transition surface (202) and the sealing platform (204) are respectively located on both sides of the first sealing groove (203).

6. A spool valve according to claim 5, characterized in that, The axial length ranges of both the first transition surface (202) and the second transition surface (206) are 0.2 - 0.5 mm.

7. A spool valve according to claim 1, characterized in that, The core body (200) is further provided with a first sealing surface (207); in the flowing direction of the refrigerant, the first sealing surface (207) is located on the upstream side of the sealing assembly.

8. A valve core according to claim 1, characterized in that, The core body (200) is further provided with a first connection surface (201) for connecting with the valve body (700); in the flowing direction of the refrigerant, the first connection surface (201) is located on the downstream side of the sealing assembly.

9. A charging valve, characterized in that: It includes a valve body (700) and a valve core as described in any one of claims 1 - 8; the valve body (700) has a valve body cavity, and the valve body cavity is provided with a second sealing surface (702); the valve core is located in the valve body cavity, and both the first sealing ring (400) and the second sealing ring (600) are in fit and sealed with the second sealing surface (702).

10. The filling valve according to claim 9, characterized in that, The valve body cavity is further provided with a guiding surface (701) and a second connection surface (703). In the flowing direction of the refrigerant, the guiding surface (701) is located on the upstream side of the second sealing surface (702), and the second connection surface (703) is located on the downstream side of the second sealing surface (702).

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