Dual-seal gas safety valve

Abstract

The utility model belongs to the technical field of gas safety valves, and particularly relates to a dual-seal gas safety valve which comprises a valve body, a first sealing assembly, a second sealing assembly and a linkage driving mechanism. An air inlet channel and an air outlet channel are arranged in the valve body, and a sealing cavity is arranged between the air inlet channel and the air outlet channel in a communicating mode. The first sealing assembly comprises a sealing valve element, an elastic sealing ring and a spring, one end of the sealing valve element extends into the sealing cavity, the elastic sealing ring is nested in a circumferential groove in the end of the sealing valve element, and the spring is arranged on the outer side of the sealing valve element in a sleeving mode and abuts against the inner wall of the valve body. Double sealing is formed through the elastic sealing ring of the first sealing assembly and the sealing cover plate of the second sealing assembly, even if the first sealing loses efficacy due to abrasion or aging, the second sealing can still rapidly respond to pressure sudden change and be closed through the pressure sensing diaphragm, gas leakage is avoided, and potential safety hazards are greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of gas safety valve technology, specifically a double-sealed gas safety valve. Background Technology

[0002] Traditional gas safety valves often employ a single sealing structure (such as a rubber gasket or metal sealing ring), which is prone to leakage due to wear and aging of the sealing surface under high pressure or corrosive gas environments. Some improved valves enhance sealing by increasing spring preload, but the springs are prone to fatigue failure after long-term use and have difficulty responding quickly to sudden pressure changes. Therefore, there is a need to develop a dual-sealed gas safety valve. Utility Model Content

[0003] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be used to limit the scope of this utility model.

[0004] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0005] A double-sealed gas safety valve includes a valve body, a first sealing assembly, a second sealing assembly, and a linkage drive mechanism.

[0006] The valve body is provided with an air inlet channel and an air outlet channel, and a sealed cavity is provided between the air inlet channel and the air outlet channel;

[0007] The first sealing assembly includes a sealing valve core, an elastic sealing ring, and a spring. One end of the sealing valve core extends into the sealing cavity, the elastic sealing ring is nested in the circumferential groove at the end of the sealing valve core, and the spring is sleeved on the outside of the sealing valve core and abuts against the inner wall of the valve body.

[0008] The second sealing assembly includes a sealing cover plate, a guide rod, and a pressure-sensing diaphragm. The sealing cover plate is hinged to the top opening of the valve body. The guide rod is vertically connected to the bottom surface of the sealing cover plate and connected to the sealing valve core. The pressure-sensing diaphragm is fixed to the end of the guide rod.

[0009] The linkage drive mechanism includes a lever and a rotating shaft. The lever is hinged to the top of the sealing cover plate via the rotating shaft, and one end of the lever is connected to the top of the guide rod.

[0010] In a preferred embodiment of the double-sealed gas safety valve described in this utility model, the cross-section of the elastic sealing ring is trapezoidal, and its inclined surface matches and fits the conical surface of the inner wall of the sealing cavity.

[0011] In a preferred embodiment of the dual-sealed gas safety valve described in this utility model, the pressure-sensing diaphragm is a corrugated metal sheet, the edge of which is fixed to the inner wall of the valve body by an annular pressure plate.

[0012] In a preferred embodiment of the double-sealed gas safety valve described in this utility model, a slider is slidably mounted on the upper part of the lever, and a counterweight is fixedly mounted on the bottom of the slider.

[0013] In a preferred embodiment of the double-sealed gas safety valve described in this utility model, a fixing screw is threaded through the top of the slider, and the fixing screw is threaded to the lever.

[0014] The beneficial effects of this utility model are: the elastic sealing ring of the first sealing component and the sealing cover of the second sealing component form a double seal. Even if the first seal fails due to wear or aging, the second seal can still quickly respond to pressure changes and close through the pressure sensing diaphragm, avoiding gas leakage and greatly reducing safety hazards.

[0015] The trapezoidal cross-section design of the elastic sealing ring generates radial expansion under pressure, forming an adaptive fit with the conical surface of the sealing cavity. This can compensate for minor wear or deformation of the sealing surface caused by long-term use, reduce maintenance frequency, and extend valve life. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0017] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views showing the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, in actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0022] Please see Figure 1 The diagram shown is a structural schematic of an embodiment of the double-sealed gas safety valve of this utility model. Please refer to [link / reference]. Figure 1 This paper provides a detailed introduction to a double-sealed gas safety valve.

[0023] A double-sealed gas safety valve includes a valve body 100, a first sealing assembly 200, a second sealing assembly 300, and a linkage drive mechanism 400.

[0024] The valve body 100 is provided with an air inlet channel 101 and an air outlet channel 102 inside, and a sealing cavity 103 is provided between the air inlet channel 101 and the air outlet channel 102.

[0025] The first sealing assembly 200 includes a sealing valve core 201, an elastic sealing ring 202, and a spring 203. One end of the sealing valve core 201 extends into the sealing cavity 103. The elastic sealing ring 202 is nested in the end circumferential groove 204 of the sealing valve core 201. The spring 203 is sleeved on the outside of the sealing valve core 201 and abuts against the inner wall of the valve body 100.

[0026] The second sealing assembly 300 includes a sealing cover plate 301, a guide rod 302, and a pressure sensing diaphragm 303. The sealing cover plate 301 is hinged to the top opening of the valve body 100. The guide rod 302 is vertically connected to the bottom surface of the sealing cover plate 301 and connected to the sealing valve core 201. The pressure sensing diaphragm 303 is fixed to the end of the guide rod 302.

[0027] The linkage drive mechanism 400 includes a lever 401 and a rotating shaft 402. The lever 401 is hinged to the top of the sealing cover plate 301 via the rotating shaft 402, and one end of the lever 401 is connected to the top end of the guide rod 302.

[0028] The sealing valve core 201 of the first sealing assembly 200, under the action of the spring 203, pushes the elastic sealing ring 202 to press against the conical surface 104 of the sealing cavity 103, forming the first seal; when the gas pressure exceeds the threshold, the pressure pushes the pressure sensing diaphragm 303 to deform, causing the guide rod 302 to move upward, and through the lever 401, the sealing valve core 201 moves backward to overcome the resistance of the spring 203, releasing the gas; after the pressure decreases, the spring 203 resets the sealing valve core 201, the double sealing structure improves reliability, and the linkage mechanism achieves rapid response;

[0029] Furthermore, the cross-section of the elastic sealing ring 202 is a trapezoidal structure, and its inclined surface matches and fits the conical surface of the inner wall of the sealing cavity 103. When the trapezoidal cross-section of the elastic sealing ring 202 is compressed, it generates radial expansion, which enhances the fit with the conical surface 104 and improves the adaptive compensation capability of the sealing surface.

[0030] Furthermore, the pressure-sensing diaphragm 303 is a corrugated metal sheet, the edge of which is fixed to the inner wall of the valve body 100 by an annular pressure plate 304. The corrugated structure of the pressure-sensing diaphragm 303 expands the effective deformation area and improves the sensitivity.

[0031] Furthermore, a slider 403 is slidably mounted on the upper part of the lever 401. A counterweight 403 is fixedly mounted on the bottom of the slider 403, and a fixing screw 405 is screwed through the top of the slider 403. The fixing screw 405 is screwed to the lever 401, allowing adjustment of the relative position of the counterweight 403 on the lever 401. By sliding the slider 403 on the lever 401, the lever arm length between the counterweight 404 and the rotating shaft 402 can be changed. The transmission ratio of the lever 401 can be flexibly adjusted according to the pressure characteristics of different gas media, such as high pressure / low pressure, steady state / pulse. For example, in a high-pressure scenario, the slider 403 is moved closer to the sealing valve core 201 to increase the opening and closing force of the first sealing assembly 200; in a low-pressure scenario, it is moved closer to the guide rod 302 to improve the sensitivity of the second sealing assembly 300, achieving precise pressure control.

[0032] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A double-sealed gas safety valve, characterized in that, It includes a valve body (100), a first sealing assembly (200), a second sealing assembly (300), and a linkage drive mechanism (400). The valve body (100) is provided with an air inlet channel (101) and an air outlet channel (102) inside, and a sealing cavity (103) is provided between the air inlet channel (101) and the air outlet channel (102). The first sealing assembly (200) includes a sealing valve core (201), an elastic sealing ring (202), and a spring (203). One end of the sealing valve core (201) extends into the sealing cavity (103). The elastic sealing ring (202) is nested in the end circumferential groove (204) of the sealing valve core (201). The spring (203) is sleeved on the outside of the sealing valve core (201) and abuts against the inner wall of the valve body (100). The second sealing assembly (300) includes a sealing cover plate (301), a guide rod (302), and a pressure sensing diaphragm (303). The sealing cover plate (301) is hinged to the top opening of the valve body (100). The guide rod (302) is vertically connected to the bottom surface of the sealing cover plate (301) and connected to the sealing valve core (201). The pressure sensing diaphragm (303) is fixed to the end of the guide rod (302). The linkage drive mechanism (400) includes a lever (401) and a rotating shaft (402). The lever (401) is hinged to the top of the sealing cover plate (301) via the rotating shaft (402), and one end of the lever (401) is connected to the top end of the guide rod (302).

2. The double-sealed gas safety valve according to claim 1, characterized in that, The cross-section of the elastic sealing ring (202) is trapezoidal, and its inclined surface matches and fits the conical surface of the inner wall of the sealing cavity (103).

3. The double-sealed gas safety valve according to claim 1, characterized in that, The pressure-sensing diaphragm (303) is a corrugated metal sheet, the edges of which are fixed to the inner wall of the valve body (100) by an annular pressure plate (304).

4. The double-sealed gas safety valve according to claim 1, characterized in that, The lever (401) is slidably fitted with a slider (403), and a weight (404) is fixedly installed at the bottom of the slider (403).

5. The double-sealed gas safety valve according to claim 4, characterized in that, A fixing screw (405) is threaded through the top of the slider (403), and the fixing screw (405) is threaded to the lever (401).

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