Filling valve element and filling valve

Abstract

The utility model discloses a filling valve core and a filling valve, and belongs to the technical field of control valves, the filling valve core comprises a core body, a core rod and a sealing gasket; the core body is provided with an injection hole, an inner hole and an output hole which are communicated in sequence; the core rod is arranged in the inner hole in a sliding mode, a guide shaft is arranged on the core rod, and the guide shaft and the inner hole are positioned in a matched mode; the sealing gasket is connected with the lower end of the core rod, and the sealing gasket can close or open the output hole along with the vertical movement of the core rod; after the output hole is opened, the guide shaft is maintained to be matched with the inner hole so as to prevent the core rod from swinging; the filling valve comprises a valve body and further comprises the filling valve element. A valve cavity is formed in the valve body, and the filling valve element is installed in the valve cavity. The filling valve element and the filling valve are simple in overall structure, and the sealing gasket is good in sealing performance.

Description

Technical Field

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

[0002] With the continuous development of the automotive industry, the performance and reliability requirements for automotive air conditioning systems are getting higher and higher. As one of the key components in the automotive air conditioning system, the performance of the automotive air conditioning filling valve core directly affects the filling efficiency, sealing performance, and safety of the automotive air conditioning system. At present, there are certain limitations in the structural design, material selection, and manufacturing process of existing automotive air conditioning filling valve cores, making it difficult to meet the increasingly high performance requirements of automotive air conditioning systems. For example, some air conditioning filling valve cores have problems such as poor sealing performance of the sealing gasket and easy leakage, resulting in refrigerant loss, affecting the refrigeration effect of the automotive air conditioner, increasing the time cost of automotive maintenance and repair, and especially unable to meet the requirements of high-pressure filling. Summary of the Utility Model

[0003] Regarding the problems existing in the prior art, the utility model provides a filling valve core and a filling valve, which improve the sealing effect of the sealing gasket and enhance the sealing performance of the filling valve core and the filling valve.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] On the one hand, the utility model provides a filling valve core, which includes a core body, a core rod, and a sealing gasket;

[0006] The core body is provided with an injection hole, an inner hole, and an output hole that are sequentially communicated;

[0007] The core rod is slidably arranged in the inner hole, and a guide shaft is provided on the core rod, and the guide shaft is positioned in cooperation with the inner hole;

[0008] The sealing gasket is connected to the lower end of the core rod. As the core rod moves up and down, the sealing gasket can close or open the output hole; after the output hole is opened, the cooperation between the guide shaft and the inner hole is maintained to prevent the core rod from swinging.

[0009] In the above-mentioned filling valve core, the guide shaft is located at the lower part of the core rod, adjacent to the sealing gasket.

[0010] In the above-mentioned filling valve core, a plurality of positioning portions are provided on the outer side wall of the guide shaft, and the positioning portions are in cooperation with and guide the inner hole; in the circumferential direction of the guide shaft, a second concave portion is provided between two adjacent positioning portions.

[0011] In the above-mentioned filling valve core, the second concave portion extends along the axial direction of the guiding shaft and extends downward from the upper end surface of the guiding shaft; the axial length of the second concave portion is less than the length of the guiding shaft, and a receiving portion is formed between the second concave portion and the lower end surface of the guiding shaft.

[0012] And / or, the clearance between the positioning surface of the positioning portion and the inner hole is 0.2 - 0.3 mm;

[0013] And / or, the number of both the positioning portion and the second concave portion is two.

[0014] In the above-mentioned filling valve core, the output hole is located on the lower end surface of the core body, and the output hole is in a horn shape, and a conical sealing surface is formed on its inner side surface; the upper end of the sealing gasket extends into the output hole and cooperates with the sealing surface to form a seal;

[0015] And / or, the injection hole is located on the outer side wall of the upper end portion of the core body; a first concave portion is provided at the position corresponding to the injection hole on the core body, and the first concave portion extends upward from the lower end to the upper end surface of the core body;

[0016] And / or, the axial length of the guiding shaft is 2 - 4 mm.

[0017] In the above-mentioned filling valve core, a sealing ring is further included, and the cross-section of the sealing ring is rectangular; a ring groove is provided on the outer side wall of the core body, and the sealing ring is located in the ring groove.

[0018] In the above-mentioned filling valve core, the width of the ring groove is 1.7 - 1.8 mm, and the dimension of the sealing ring in the width direction of the ring groove is 1 - 2 mm.

[0019] In the above-mentioned filling valve core, an elastic member is further included, and the elastic member applies an upward thrust on the core rod to maintain the state that the sealing gasket closes the output hole.

[0020] In the above-mentioned filling valve core, an external thread is provided on the outer side wall of the core body, and the external thread is located at the lower end portion of the core body.

[0021] On the other hand, the present invention provides a filling valve, which includes a valve body and also includes the above-mentioned filling valve core; a valve cavity is provided in the valve body, and the filling valve core is installed in the valve cavity.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. The overall structures of the filling valve core and the filling valve are simple, and the assembly process performance is good;

[0024] 2. A guide shaft is set between the core rod and the inner hole of the filling valve core. By reasonably setting the gap between the guide shaft and the inner hole, the movement of the core rod can be guided to avoid the core rod tilting during filling, which affects the sealing performance of the sealing gasket;

[0025] 3. The guide shaft is provided with a positioning portion and a second inner concave portion, which can be used for guiding the core rod and circulating the fluid respectively, which not only realizes the positioning and guiding of the core rod, but also does not affect the circulation of the fluid;

[0026] 4. The guide shaft is adjacent to the sealing gasket, that is, adjacent to the output hole; the second inner concave portion does not penetrate the guide shaft, but forms a receiving portion between the second inner concave portion and the lower end surface of the guide shaft. The existence of the receiving portion can prevent the fluid from directly impacting the sealing gasket, and the fluid will not directly impact the sealing gasket; it is beneficial to extend the service life of the filling valve core, and does not affect the opening of the output hole;

[0027] 5. Since the upper end of the sealing gasket extends into the output hole and cooperates with the sealing surface of the output hole to form a seal, impurities can be prevented from entering between the sealing gasket and the sealing surface, thus avoiding the influence of impurities on the sealing performance;

[0028] 6. The cross section of the sealing ring is rectangular, forming a relatively large sealing cross-sectional area with the valve body, so that the filling valve has good sealing characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the filling valve core of the utility model;

[0030] Figure 2 for Figure 1 Schematic diagram of the structure of the AA section;

[0031] Figure 3 It is a schematic diagram of the overall structure of an embodiment of the filling valve of the utility model;

[0032] Figure 4 for Figure 3 Magnified view of area B.

[0033] In the figure:

[0034] 10- elastic member;

[0035] 20-core body; 201-inner hole; 202-annular groove; 203-output hole; 204-injection hole; 205-first inner concave portion; 206-external thread;

[0036] 30-sealing ring;

[0037] 40-core rod; 401-guide shaft; 402-first limiting portion; 403-second limiting portion; 404-second inner concave portion; 405-positioning portion; 406-receiving portion;

[0038] 50 - Gasket;

[0039] 60 - Valve body; 601 - Valve cavity. Detailed implementation mode

[0040] For the convenience of those skilled in the art to understand, the present utility model will be further described below with reference to the accompanying drawings.

[0041] In the first aspect, please refer to Figure 1 , Figure 2 , which is an embodiment of a filling valve core provided by the present utility model, including an elastic member 10, a core body 20, a sealing ring 30, a core rod 40 and a gasket 50. Among them, the core body 20 is provided with an inner hole 201, an injection hole 204 and an output hole 203; the injection hole 204 communicates with the inner hole 201 to guide the fluid into the inner hole 201; the output hole 203 is communicated with the output end of the inner hole 201, and the fluid flows out through the output hole 203.

[0042] In the following text, based on the flow direction of the fluid, one end of the core body 20, the core rod 40, etc. on the downstream side is set as the lower end, and the end opposite to the lower end is the upper end.

[0043] Preferably, the injection hole 204 is located on the outer side wall of the upper end portion of the core body 20, which is convenient for processing. In order to guide the fluid into the injection hole 204, a first concave portion 205 is provided at the position corresponding to the injection hole 204 on the core body 20. The first concave portion 205 extends axially, extending from the bottom up to the upper end surface of the core body 20, increasing the distance between the core body 20 at the injection hole 204 and the valve cavity 601 of the valve body 60, which is beneficial for the fluid to flow into the injection hole 204 along the first concave portion 205.

[0044] The output hole 203 is preferably arranged on the lower end surface of the core body 20. The output hole 203 is in a flared shape, with a smaller inner diameter at the end connecting the inner hole 201 and a larger inner diameter at the other end; the inner side surface of the output hole 203 forms a conical sealing surface.

[0045] The core rod 40 slides in the inner hole 201 of the core body 20, and the upper end of the core rod 40 extends out of the upper end surface of the core body 20; the upper end of the core rod 40 and the core body 20 can slide relative to each other, and the two are in clearance fit. The part of the core rod 40 extending out of the core body 20 is connected with an elastic member 10. The elastic member 10 is located between the core rod 40 and the core body 20, applying a driving force on the core rod 40 so that the core rod 40 has a tendency to move upward. The elastic member 10 can be a spring, a rubber sleeve, etc., but preferably a spring, which is sleeved outside the core rod 40, convenient for selection and durable.

[0046] The lower end of the core rod 40 is connected to the gasket 50, and the two move synchronously; the upper end of the gasket 50 extends into the output hole 203 and cooperates with the sealing surface to form a seal. Since the elastic member 10 exerts an elastic force on the core rod 40, the gasket 50 has a tendency to seal the output hole 203; that is, when there is no external force on the core rod 40, the elastic member 10 can maintain the close contact between the gasket 50 and the output hole 203. However, when the upper end of the core rod 40 is pushed downward, the gasket 50 is separated from the sealing surface, and the output hole 203 can be opened.

[0047] Further, the upper end and the lower end of the core rod 40 are respectively provided with a first limiting portion 402 and a second limiting portion 403, and the two ends of the elastic member 10 are respectively abutted against or fixedly connected to the first limiting portion 402 and the upper end surface of the core body 20. The gasket 50 is sleeved on the core rod 40. When the core rod 40 moves upward, the second limiting portion 403 pushes and presses the gasket 50, so that seals are formed between the gasket 50 and the output hole 203, the core rod 40, and the second limiting portion 403.

[0048] A guide shaft 401 is provided on the core rod 40, and the guide shaft 401 cooperates with the inner hole 201 to guide the sliding of the core rod 40. When filling is carried out, a part of the guide shaft 401 still cooperates with the inner hole 201 to prevent the core rod 40 from swinging during high-pressure filling. Preferably, the guide shaft 401 is located at the lower part of the core rod 40 and is adjacent to the gasket 50. The guide shaft 401 is located above the gasket 50, that is, the gasket 50 is located between the guide shaft 401 and the second limiting portion 403.

[0049] Further, please refer to Figure 1 、 Figure 2 ., the guide shaft 401 has a plurality of positioning portions 405 and a plurality of second concave portions 404. In the circumferential direction of the guide shaft 401, the positioning portions 405 and the second concave portions 404 are arranged at intervals; the positioning portions 405 are used to guide the movement of the core rod 40, and the second concave portions 404 are used for fluid circulation. The number of the positioning portions 405 and the second concave portions 404 can be set as required. For example, as Figure 2 shown, the number of both the positioning portions 405 and the second concave portions 404 is two, and the two positioning portions 405 and the two second concave portions 404 are spaced apart and symmetrically arranged in the circumferential direction of the guide shaft 401.

[0050] The outer side surface of the positioning portion 405 is a positioning surface, and the positioning surface is a part of a cylindrical surface. The size of the corresponding central angle can be set as required, such as 45°, 50°, 60°, etc. Through the cooperation between the positioning surface and the inner hole 201, the guide shaft 401 plays a role of guiding and straightening when the core rod 40 moves. Preferably, the gap between the positioning surface of the positioning portion 405 and the inner hole 201 is kept within the range of 0.2-0.3 mm, taking into account both the fluid passing effect and the guiding effect.

[0051] The second concave portion 404 extends axially along the guide shaft 401 and extends into the guide shaft 401 from the upper end face of the guide shaft 401; the axial length of the second concave portion 404 is less than the length of the guide shaft 401. Thus, a receiving portion 406 is formed between the second concave portion 404 and the lower end face of the guide shaft 401. When the fluid flows to the receiving portion 406, the receiving portion 406 plays a blocking role to prevent the fluid from directly acting on the gasket 50 and prevent the gasket 50 from being blown out or turned over. When the gasket 50 opens the output hole 203, a relatively spacious fluid flow path is also formed between the second concave portion 404 and the inner wall of the inner hole 201, which is beneficial to ensuring the fluid filling efficiency. The cross-sectional shape of the second concave portion 404 can be set as needed. For example, the upper end of the guide shaft 401 is milled flat to form the second concave portion 404, and a Figure 2 flat shaft structure as shown is formed between the two second concave portions 404, and the wall thickness of the flat shaft structure is 0.8 - 1.5 mm.

[0052] The length of the guide shaft 401 is 2 - 4 mm, preferably 3 - 3.5 mm; appropriately extending the length of the guide shaft 401 can ensure the mating length between the guide shaft 401 and the core 20 during high-pressure filling, thereby ensuring the guiding effect and also avoiding the shaking of the core rod 40 under the impact of high-pressure medium. The axial length of the receiving portion 406 is preferably 0.4 - 0.7 mm.

[0053] A ring groove 202 is provided on the outer side wall of the core 20, and the ring groove 202 is located below the injection hole 204; the sealing ring 30 is located in the ring groove 202. Among them, the outer side surface of the sealing ring 30 is a cylindrical surface, which can increase the effective contact area during sealing with the valve cavity 601; for example, the cross-section of the sealing ring 30 is rectangular, with a width of 1 - 2 mm, and the best size is 1.5 - 1.6 mm. At the same time, the width of the ring groove 202 is 1.7 - 1.8 mm, and the cooperation between the ring groove 202 and the sealing ring 30 achieves a better sealing effect and is easy to install.

[0054] An external thread 206 is provided on the outer side wall of the core 20, and the external thread 206 is located at the lower end of the core 20, that is, below the ring groove 202.

[0055] On the other hand, please refer to Figure 3 and Figure 4 , an embodiment of the filling valve provided by the present invention includes a valve body 60 and the above-mentioned filling valve core. A valve cavity 601 is provided in the valve body 60, and the filling valve core is located in the valve cavity 601 and is threadedly connected to the valve body 60. The outer side surface of the sealing ring 30 is a plane and can contact the inner wall of the valve cavity 601. Such a setting can make the filling valve core and the valve body 60 form a surface seal. Compared with the line seal of the O-shaped sealing ring, the contact area is larger, and the pressure-bearing and sealing effects are better; and the resistance between the filling valve core and the valve body 60 is greater, which can play a role in shock absorption and loosening prevention.

[0056] Since the external thread 206 is on the downstream side of the annular groove 202, and the gasket 50 extends into the output hole 203 to form a seal; metal impurities that appear during the assembly process of the filling valve will not fall on the sealing ring 30 and the gasket 50, ensuring the cleanliness of the filling valve core. After assembly, the sealing ring 30 makes surface contact with the sealing hole of the valve cavity 601, ensuring the reliability of the product's sealing performance. Thanks to the rectangular shape of the sealing ring of the sealing ring 30, it can have a relatively large sealing cross-sectional area.

[0057] Working principle of the filling valve:

[0058] During the fluid filling process, the core rod 40 will be pressed downward until the gasket 50 opens the output hole 203; during the movement of the core rod 40, the elastic member 10 undergoes elastic deformation under the action of an external force. The guide shaft 401 ensures that the core rod 40 and the inner hole of the core body 20 remain within the same axis range, and the core rod 40 will not have a large skew.

[0059] The sealing surface between the gasket 50 and the output hole 203 is separated to form an open filling channel, and the fluid can pass through the filling channel to achieve the filling function.

[0060] After the filling is completed, the pressing force on the core rod 40 is removed, and under the action of the elastic member 10, the core rod 40 is pushed to drive the gasket 50 to move upward, so that the sealing surface between the gasket 50 and the output hole 203 comes into contact, realizing the sealing function of the product itself.

[0061] 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, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A charging valve core, characterized in that, It includes a core body (20), a core rod (40) and a gasket (50); The core body (20) is provided with an injection hole (204), an inner hole (201) and an output hole (203) that are sequentially connected; The core rod (40) is slidably arranged in the inner hole (201). A guide shaft (401) is provided on the core rod (40), and the guide shaft (401) is positioned in cooperation with the inner hole (201); The gasket (50) is connected to the lower end of the core rod (40). As the core rod (40) moves up and down, the gasket (50) can close or open the output hole (203); after the output hole (203) is opened, the guide shaft (401) is maintained in cooperation with the inner hole (201) to prevent the core rod (40) from swinging.

2. The filling valve core according to claim 1, characterized in that, The guide shaft (401) is located at the lower part of the core rod (40), adjacent to the gasket (50).

3. The filling valve core according to claim 1 or 2, characterized in that, A plurality of positioning parts (405) are provided on the outer side wall of the guide shaft (401), and the positioning parts (405) are in cooperation and guidance with the inner hole (201); in the circumferential direction of the guide shaft (401), a second concave part (404) is provided between two adjacent positioning parts (405).

4. The filling valve core according to claim 3, characterized in that, The second concave part (404) extends along the axial direction of the guide shaft (401), extending downward from the upper end surface of the guide shaft (401); the axial length of the second concave part (404) is less than the length of the guide shaft (401), and a receiving part (406) is formed between the second concave part (404) and the lower end surface of the guide shaft (401); And / or, the gap between the positioning surface of the positioning part (405) and the inner hole (201) is 0.2 - 0.3 mm; And / or, the number of both the positioning part (405) and the second concave part (404) is two.

5. The filling valve core according to claim 1, characterized in that, The output hole (203) is located on the lower end surface of the core body (20). The output hole (203) is trumpet-shaped, and its inner side surface forms a conical sealing surface; the upper end of the gasket (50) extends into the output hole (203) and cooperates with the sealing surface to form a seal; And / or, the injection hole (204) is located on the outer side wall of the upper end part of the core body (20); a first concave part (205) is provided at the position corresponding to the injection hole (204) on the core body (20), and the first concave part (205) extends upward from the bottom to the upper end surface of the core body (20); And / or, the axial length of the guide shaft (401) is 2 - 4 mm.

6. The filling valve core according to claim 1, characterized in that, It further includes a sealing ring (30). The cross-section of the sealing ring (30) is rectangular; a ring groove (202) is provided on the outer side wall of the core body (20), and the sealing ring (30) is located in the ring groove (202).

7. The filling valve core according to claim 6, characterized in that, The width of the ring groove (202) is 1.7 - 1.8 mm, and the dimension of the sealing ring (30) in the width direction of the ring groove (202) is 1 - 2 mm.

8. The filling valve core according to claim 1, characterized in that, It further includes an elastic member (10), and the elastic member (10) applies an upward thrust on the core rod (40) to maintain the state where the gasket (50) closes the output hole (203).

9. The filling valve core according to claim 1, characterized in that, An external thread (206) is provided on the outer sidewall of the core body (20), and the external thread (206) is located at the lower end portion of the core body (20).

10. A charging valve, comprising a valve body (60), characterized in that, It further includes a filling valve core according to any one of claims 1-9; a valve cavity (601) is provided in the valve body (60), and the filling valve core is installed in the valve cavity (601).

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