Coal gas diffuser valve and coal gas holder

Abstract

This invention provides a gas venting valve and a gas holder, relating to the technical field of gas holders. The gas venting valve includes a valve body, a sealing ring, and a valve cover. The valve body has an upward-opening cavity, and the opening of the cavity has a circumferentially extending notch. The sealing ring is embedded in the notch and protrudes from the upper end of the notch. The lower end of the valve cover has a downward-protruding sealing surface, which is used to at least partially embed itself into the circular area enclosed by the sealing ring when the valve cover presses down on it, so that the valve cover and the sealing ring are mutually positioned. This gas venting valve can improve the sealing effect and help prevent gas leakage accidents.

Description

Technical Field

[0001] This invention relates to the field of gas holder technology, and more specifically, to a gas venting valve and a gas holder. Background Technology

[0002] Gas holders are commonly used gas storage devices in the steel industry, and the gas vent valve, as a key component of the gas holder, can control the emission and leakage of gas to ensure the pressure balance of the gas holder and guarantee the safety and stability of the gas holder system.

[0003] Currently, gas venting valves typically consist of a valve body and a valve cover. The valve cover is pressed against the sealing ring on the upper end of the valve body to achieve a seal. However, during the process of placing the valve cover on top of the sealing ring, the valve cover is prone to shifting relative to the sealing ring, causing the opening where the sealing ring is located to be exposed or the circumferential sealing of the sealing ring to be uneven. This results in poor sealing of the opening by the valve cover, which in turn leads to a gas leak accident. Summary of the Invention

[0004] The problem this invention addresses is: how to improve the sealing effect of a gas vent valve to prevent gas leakage accidents.

[0005] To address the aforementioned problems, the present invention provides a gas venting valve, comprising a valve body, a sealing ring, and a valve cover; the valve body has an upwardly opening cavity, and the opening of the cavity has a circumferentially extending notch; the sealing ring is embedded in the notch and protrudes from the upper end of the notch; the lower end of the valve cover has a downwardly protruding sealing surface, the sealing surface being at least partially embedded within the circular area enclosed by the sealing ring when the valve cover presses down on the sealing ring, so that the valve cover and the sealing ring are mutually positioned.

[0006] Optionally, the horizontal projection of the sealing surface is circular, and the diameter of the horizontal projection of the sealing surface is greater than the inner diameter of the sealing ring and smaller than the outer diameter of the sealing ring.

[0007] Optionally, the upper end of the sealing ring is formed with a sealing concave surface adapted to the shape of the sealing surface.

[0008] Optionally, a locking protrusion is provided on the inner wall surface of the cavity near the opening; a fixing ring is provided on the inner side of the sealing ring and is fixedly connected to the sealing ring, and the fixing ring is provided with a downwardly extending elastic locking arm, which elastically engages with the locking protrusion to fix the sealing ring relative to the valve body.

[0009] Optionally, the notch includes a horizontally arranged bottom wall, and the bottom wall is recessed with an annular recess extending circumferentially along the opening.

[0010] Optionally, the notch further includes a groove sidewall connected to the bottom wall of the groove and arranged vertically, the groove sidewall being provided with an annular rib extending circumferentially along the opening; the outer peripheral wall of the sealing ring is provided with an annular groove adapted to the shape of the annular rib.

[0011] The present invention also provides a gas holder, including a cabinet body, a fixing plate, and a gas vent valve as described above; the gas vent valve is located in the lower part of the inner cavity of the cabinet body; the fixing plate is located in the upper part of the inner cavity of the cabinet body and is fixedly connected to the inner wall of the cabinet body; the fixing plate is provided with a winding mechanism, a lifting rope is wound on the winding mechanism, the free end of the lifting rope is connected to the valve cover of the gas vent valve, and the winding mechanism is used to lift or lower the valve cover by winding or unwinding the lifting rope.

[0012] Optionally, the outer wall of the gas vent valve body is provided with a mounting seat, and the upper end of the mounting seat is provided with a guide rod extending vertically, the upper end of the guide rod being higher than the upper end of the sealing ring of the gas vent valve; the valve cover is provided with a guide hole that guides and cooperates with the guide rod.

[0013] Optionally, two guide rods are provided, with the two guide rods located on both sides of the valve body respectively; two guide holes are provided, with the two guide holes located on both sides of the valve cover respectively, and the two guide holes are guided and engaged with the two guide rods respectively.

[0014] Optionally, the gas holder further includes two guide ropes; the lower ends of the two guide ropes are respectively connected to the upper ends of the two guide rods, and the upper ends of the two guide ropes are respectively connected to the fixing plate. The distance between the connection points of the two guide ropes on the fixing plate is equal to the distance between the two guide rods.

[0015] Compared with the prior art, the gas venting valve provided by the present invention has, but is not limited to, the following technical effects:

[0016] In the gas venting valve provided by this invention, a sealing ring is embedded in a notch groove and protrudes from the upper end of the notch groove, allowing the lower end of the valve cover to contact the upper end of the sealing ring. This presses the sealing ring tightly within the notch groove, and the notch groove limits the sealing ring's position, preventing deformation and misalignment under stress, thereby improving the sealing effect of the sealing ring on the opening. Simultaneously, by providing a downwardly protruding sealing surface at the lower end of the valve cover, when the valve cover presses down on the sealing ring, the sealing surface can embed into the circular area enclosed by the sealing ring. The interlocking action between the sealing surface and the inner side of the sealing ring provides a good positioning effect for the valve cover, facilitating alignment of the valve cover with the sealing ring. This prevents the valve cover from not completely and evenly covering the sealing ring, which could lead to the sealing ring being exposed at the opening or poor circumferential sealing uniformity, thus improving the sealing effect of the valve cover on the opening. Therefore, both the sealing effect of the sealing ring on the opening and the sealing effect of the valve cover on the opening are improved, effectively enhancing the overall sealing effect of the gas venting valve and helping to prevent gas leakage accidents. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the gas venting valve according to an embodiment of the present invention;

[0018] Figure 2 This is a partial schematic diagram of a gas venting valve according to an embodiment of the present invention;

[0019] Figure 3 for Figure 1 Enlarged schematic diagram of part A of the coal gas vent valve;

[0020] Figure 4 This is a schematic diagram of the gas holder according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 10-Gas vent valve, 11-Valve body, 111-Cavity, 1111-Protrusion, 112-Opening, 113-Notch, 1131-Gate bottom wall, 1132-Annular recess, 1133-Gate side wall, 1134-Annular rib, 114-Mounting base, 115-Guide rod, 12-Sealing ring, 121-Sealing concave surface, 122-Annular groove, 13-Valve cover, 131-Sealing curved surface, 132-Guide hole, 14-Fixing ring, 141-Elastic locking arm, 1411-Bending section, 20-Fixing plate, 21-Rewinding mechanism, 22-Lifting rope, 30-Guide rope. Detailed Implementation

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] In the description of this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," and "third" may explicitly or implicitly include at least one of those features. Furthermore, in the description of this invention, the terms "embodiment" and "exemplary" are used to indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or implementation of the invention. In this invention, illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0025] In the description of this invention, the terms "upper", "lower", "front", "rear", "left", and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this 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. Therefore, they should not be construed as limitations on this invention.

[0026] Furthermore, in the description of this invention, the Y-axis in the accompanying drawings represents the horizontal direction and is designated as left and right positions, with the positive direction of the Y-axis representing the left and the negative direction representing the right; the Z-axis in the accompanying drawings represents the vertical direction, that is, the up and down position, with the positive direction of the Z-axis representing the top and the negative direction representing the bottom. It should be noted that the aforementioned representations of the Y-axis and Z-axis are merely for the convenience of describing this invention and for simplifying the description, and are not intended to 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 limiting the invention.

[0027] Please refer to Figure 1 This invention provides a gas venting valve 10, including a valve body 11, a sealing ring 12, and a valve cover 13. The valve body 11 has an upwardly opening cavity 112, and the opening 112 of the cavity 111 has a circumferentially extending notch 113. The sealing ring 12 is embedded in the notch 113 and protrudes from the upper end of the notch 113. The lower end of the valve cover 13 has a downwardly protruding sealing surface 131, which is used to at least partially embed itself into the circular area enclosed by the sealing ring 12 when the valve cover 13 presses down on the sealing ring 12, so that the valve cover 13 and the sealing ring 12 are mutually positioned.

[0028] In practical applications, the gas venting valve 10 can be placed inside the gas holder, and the valve cover 13 can be connected to the lifting rope 22 of the winding mechanism 21. The valve cover 13 can be lifted or lowered by winding or unwinding the lifting rope 22 through the winding mechanism 21. When the winding mechanism 21 lowers the valve cover 13, the valve cover 13 presses the sealing ring 12 against the valve body 11 to seal the opening 112. When the winding mechanism 21 lifts the valve cover 13, the valve cover 13 disengages from the sealing ring 12 to open the opening 112.

[0029] In this embodiment, by embedding the sealing ring 12 into the notch 113 and protruding from the upper end of the notch 113, the lower end of the valve cover 13 can contact the upper end of the sealing ring 12, thereby pressing the sealing ring 12 tightly within the notch 113. The notch 113 also limits the sealing ring 12, preventing it from deforming or shifting under stress, thus improving the sealing effect of the sealing ring 12 on the opening 112. Simultaneously, by providing a downwardly protruding sealing surface 131 at the lower end of the valve cover 13, the sealing effect of the valve cover 13... When the sealing ring 12 is pressed down, the sealing surface 131 can be embedded in the circular area enclosed by the sealing ring 12. The interlocking action between the sealing surface 131 and the inner side of the sealing ring 12 provides a good positioning effect for the valve cover 13, which helps the valve cover 13 to align with the sealing ring 12. This prevents the valve cover 13 from not completely and evenly covering the sealing ring 12, which could lead to the opening 112 of the sealing ring 12 being exposed or the circumferential sealing uniformity of the sealing ring 12 being poor. This improves the sealing effect of the valve cover 13 on the opening 112. Therefore, the sealing effect of the sealing ring 12 on the opening 112 and the sealing effect of the valve cover 13 on the opening 112 can be improved, thereby effectively improving the sealing effect of the entire gas venting valve 10 and helping to prevent gas leakage accidents.

[0030] Alternatively, please refer to Figure 2 The horizontal projection of the sealing surface 131 is circular, and the diameter D2 of the horizontal projection of the sealing surface 131 is greater than the inner diameter D1 of the sealing ring 12 and less than the outer diameter D3 of the sealing ring 12.

[0031] It should be noted that horizontal projection refers to orthographic projection on any horizontal plane, such as orthographic projection on the horizontal plane where the lower end face of valve body 11 is located.

[0032] In this embodiment, by making the diameter D2 of the horizontal projection of the sealing surface 131 larger than the inner diameter D1 of the sealing ring 12 and smaller than the outer diameter D3 of the sealing ring 12, the sealing surface 131 can be prevented from completely entering the circular area enclosed by the sealing ring 12. As a result, when the valve cover 13 presses down on the sealing ring 12, the sealing surface 131 can contact the inner edge of the top surface of the sealing ring 12, which can guide and position the sealing surface 131.

[0033] Alternatively, please refer to Figure 2The upper end of the sealing ring 12 has a sealing concave surface 121 that is adapted to the shape of the sealing curved surface 131.

[0034] In this embodiment, by providing a sealing concave surface 121 at the upper end of the sealing ring 12, and by adapting the shape of the sealing concave surface 121 to the sealing curved surface 131, the mutual cooperation of the concave and convex surfaces can further improve the positioning effect of the valve cover 13 and enhance the sealing effect of the valve cover 13 on the opening 112. Furthermore, the mutual cooperation of the concave and convex surfaces can increase the length of the gas flow path between the sealing ring 12 and the valve cover 13, thereby further preventing gas leakage between the sealing ring 12 and the valve cover 13.

[0035] Alternatively, please refer to Figure 2 The inner wall of the cavity 111 is provided with a locking protrusion 1111 near the opening 112; the inner side of the sealing ring 12 is provided with a fixing ring 14 fixedly connected to the sealing ring 12, and the fixing ring 14 is provided with a downwardly extending elastic locking arm 141. The elastic locking arm 141 is elastically engaged with the locking protrusion 1111 so that the sealing ring 12 is relatively fixed to the valve body 11.

[0036] Specifically, please refer to Figure 2 The protrusion 1111 can be a raised structure on the inner wall of the cavity 111. The lower end of the elastic arm 141 can be bent upwards and toward the protrusion 1111 to form a bent section 1411. The bent section 1411 is provided with a groove that matches the shape of the protrusion 1111. Thus, by using the groove to engage with the protrusion 1111, the elastic arm 141 and the protrusion 1111 can be elastically engaged. It should be noted that this embodiment does not limit the method of fixing the sealing ring 12 and the fixing ring 14. For example, the fixing ring 14 can be fixed to the sealing ring 12 by adhesive. Furthermore, the upper end of the fixing ring 14 can be lower than the lower end of the sealing concave surface 121 to avoid the sealing curved surface 131 being obstructed by the upper end of the fixing ring 14 when it engages with the sealing concave surface 121.

[0037] In this embodiment, by providing a locking protrusion 1111 on the inner wall of the cavity 111 and an elastic locking arm 141 on the fixing ring 14 inside the sealing ring 12, the sealing ring 12 can be fixed to the valve body 11 by the elastic engagement of the locking protrusion 1111 and the elastic locking arm 141, so as to prevent the sealing ring 12 from becoming loose relative to the opening 112, and to prevent the sealing ring 12 from being deformed and misaligned when the valve cover 13 is pressed down, thereby improving the sealing effect of the sealing ring 12 on the opening 112.

[0038] Alternatively, please refer to Figure 3 The notch 113 includes a horizontally arranged bottom wall 1131, and the bottom wall 1131 is recessed with an annular recess 1132 extending circumferentially along the opening 112.

[0039] It should be noted that there is no limit to the number of annular depressions 1132; there can be one or more. For example, please refer to [reference needed]. Figure 3 Three annular recesses 1132 are provided, and the three annular recesses 1132 are arranged sequentially at intervals along the radial direction of the opening 112.

[0040] In this embodiment, by providing an annular recess 1132 extending circumferentially along the opening 112 on the bottom wall 1131 of the notch groove 113, when the valve cover 13 presses down on the sealing ring 12, the sealing ring 12 deforms and enters the annular recess 1132, making the sealing ring 12 in closer contact with the bottom wall 1131 and preventing gas leakage between the sealing ring 12 and the bottom wall 1131. Furthermore, the cooperation between the sealing ring 12 and the annular recess 1132 increases the length of the gas flow path between the sealing ring 12 and the bottom wall 1131, further preventing gas leakage between the sealing ring 12 and the bottom wall 1131.

[0041] Alternatively, please refer to Figure 3 The notch 113 also includes a groove sidewall 1133 connected to the groove bottom wall 1131 and arranged vertically. The groove sidewall 1133 is provided with an annular rib 1134 extending circumferentially along the opening 112. The outer peripheral wall of the sealing ring 12 is provided with an annular groove 122 that matches the shape of the annular rib 1134.

[0042] Specifically, please refer to Figure 3 The cross-sections of the annular rib 1134 and the annular groove 122 can be set as arc surfaces to facilitate the installation of the sealing ring 12.

[0043] In this embodiment, by providing an annular rib 1134 extending circumferentially along the opening 112 on the groove sidewall 1133 of the notch groove 113, and providing an annular groove 122 with a shape adapted to the annular rib 1134 on the outer peripheral wall of the sealing ring 12, when the sealing ring 12 is embedded in the notch groove 113, the annular rib 1134 and the annular groove 122 fit together perfectly. If the valve cover 13 then presses the sealing ring 12 downward, the annular rib 1134 will obstruct the sealing ring 12. Under the combined action of the resistance of the annular rib 1134 and the pressure of the valve cover 13, the part of the sealing ring 12 between the annular rib 1134 and the valve cover 13 will deform and fit tightly with the annular rib 1134 and the valve cover 13, which can improve the sealing effect of the sealing ring 12 in the notch groove 113 and prevent gas from leaking between the sealing ring 12 and the groove sidewall 1133. Furthermore, the cooperation between the sealing ring 12 and the annular rib 1134 can increase the length of the gas flow path between the sealing ring 12 and the groove sidewall 1133, thereby further preventing gas leakage between the sealing ring 12 and the groove sidewall 1133.

[0044] Please refer to Figure 4This invention also provides a gas holder, which includes a cabinet body, a fixing plate 20, and a gas venting valve 10 as described above. The gas venting valve 10 is located in the lower part of the inner cavity of the cabinet body. The fixing plate 20 is located in the upper part of the inner cavity of the cabinet body and is fixedly connected to the inner wall of the cabinet body. The fixing plate 20 is provided with a winding mechanism 21, and a lifting rope 22 is wound on the winding mechanism 21. The free end of the lifting rope 22 is connected to the valve cover 13 of the gas venting valve 10. The winding mechanism 21 is used to lift or lower the valve cover 13 by winding or unwinding the lifting rope 22.

[0045] It should be noted that there are no restrictions on the specific type of the winding mechanism 21, such as a winch or an electric hoist. Specifically, the gas holder can be a rubber diaphragm sealed gas holder. Specifically, a gas vent pipe can be installed in the lower part of the inner cavity of the holder, and one end of the gas vent pipe is connected to the cavity 111 of the valve body 11, while the other end of the gas vent pipe passes through the wall of the holder and connects to the outside. When the valve cover 13 disengages from the sealing ring 12 and opens the opening 112, the gas in the holder enters the gas vent pipe through the gas vent valve 10 and is released to the outside, thus realizing gas venting. Afterwards, if the valve cover 13 presses the sealing ring 12 tightly against the valve body 11 and seals the opening 112, the gas in the holder will not enter the gas vent pipe through the gas vent valve 10 and be released to the outside, thus stopping gas venting.

[0046] In this embodiment, since the gas holder adopts the technical solution of the above-mentioned gas venting valve 10 embodiment, it at least has the beneficial effects brought by the above-mentioned gas venting valve 10 embodiment. Specifically, by embedding the sealing ring 12 in the notch 113 and protruding from the upper end of the notch 113, the lower end of the valve cover 13 can contact the upper end of the sealing ring 12, so as to press the sealing ring 12 into the notch 113, which can improve the sealing effect of the sealing ring 12 on the opening 112; at the same time, by providing a downwardly protruding sealing surface 131 at the lower end of the valve cover 13, when the valve cover 13 presses down on the sealing ring 12, the sealing surface 131 can be embedded in the sealing ring 12. The mutual interlocking action of the sealing surface 131 and the inner side of the sealing ring 12 can play a good positioning effect on the valve cover 13, so that the valve cover 13 is aligned with the sealing ring 12, so as to avoid the opening 112 where the sealing ring 12 is exposed or the sealing of the sealing ring 12 is uneven, which can improve the sealing effect of the valve cover 13 on the opening 112. Therefore, the sealing effect of the sealing ring 12 on the opening 112 and the sealing effect of the valve cover 13 on the opening 112 are improved, thereby effectively improving the sealing effect of the entire gas venting valve 10 and helping to prevent gas leakage accidents.

[0047] Alternatively, please refer to Figure 4The outer wall of the valve body 11 of the gas venting valve 10 is provided with a mounting base 114. The upper end of the mounting base 114 is provided with a guide rod 115 extending vertically. The upper end of the guide rod 115 is higher than the upper end of the sealing ring 12 of the gas venting valve 10. The valve cover 13 is provided with a guide hole 132 that guides and cooperates with the guide rod 115.

[0048] Specifically, the upper end face of the guide rod 115 can be set as a spherical surface so that the guide rod 115 can be inserted into the guide hole 132 to ensure the smooth lowering of the valve cover 13.

[0049] In this embodiment, by providing a guide rod 115 on the valve body 11 and a guide hole 132 on the valve cover 13 that cooperates with the guide rod 115, the guide rod 115 can cooperate with the guide hole 132 when the winding mechanism 21 lowers the valve cover 13, so as to play a better guiding role for the valve cover 13, ensuring that the valve cover 13 is aligned with the sealing ring 12, and further improving the sealing effect.

[0050] Alternatively, please refer to Figure 4 Two guide rods 115 are provided, and the two guide rods 115 are respectively located on both sides of the valve body 11; two guide holes 132 are provided, and the two guide holes 132 are respectively located on both sides of the valve cover 13, and the two guide holes 132 are respectively guided and engaged with the two guide rods 115.

[0051] In this embodiment, by providing two guide rods 115 and two guide holes 132 respectively, and by having the two guide holes 132 and the two guide rods 115 respectively guide and cooperate, the guiding effect on the valve cover 13 can be further improved, which is more conducive to improving the sealing performance.

[0052] Alternatively, please refer to Figure 4 The gas holder also includes two guide ropes 30; the lower ends of the two guide ropes 30 are respectively connected to the upper ends of the two guide rods 115, and the upper ends of the two guide ropes 30 are respectively connected to the fixing plate 20. The distance between the connection points of the two guide ropes 30 on the fixing plate 20 is equal to the distance between the two guide rods 115.

[0053] It is understandable that during the process of lowering the valve cover 13 with the hoisting rope 22, its guide hole 132 will first move along the guide rope 30, and after leaving the guide rope 30, it will be fitted with the guide rod 115 and move along the guide rod 115. That is, the guide rope 30 and the guide rod 115 work together to guide the valve cover 13.

[0054] In this embodiment, a guide rope 30 is provided between the guide rod 115 and the fixing plate 20. In this way, the guide rope 30 can guide the valve cover 13 at the beginning of the lowering process, so that the guide hole 132 can be smoothly fitted onto the guide rod 115, ensuring that the valve cover 13 is aligned with the sealing ring 12. At the same time, because the guide rope 30 itself is relatively soft, the guide hole 132 is not prone to jamming during the movement along the guide rope 30, which helps to ensure the lowering speed of the valve cover 13 and make the gas venting valve 10 close quickly.

[0055] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A coal gas relief valve (10) characterized by, The valve includes a valve body (11), a sealing ring (12), and a valve cover (13). The valve body (11) has an upwardly opening cavity (111) with an opening (112), and the opening (112) of the cavity (111) has a circumferentially extending notch (113). The sealing ring (12) is embedded in the notch (113) and protrudes from the upper end of the notch (113). The lower end of the valve cover (13) has a downwardly protruding sealing surface (131), which is used to at least partially embed the sealing ring (12) when the valve cover (13) presses down on it. Within the circular area enclosed by the sealing ring (12), the valve cover (13) and the sealing ring (12) are positioned relative to each other; a locking protrusion (1111) is provided on the inner wall surface of the cavity (111) near the opening (112); a fixing ring (14) is provided on the inner side of the sealing ring (12) and is fixedly connected to the sealing ring (12); an elastic locking arm (141) extending downward is provided on the fixing ring (14); the elastic locking arm (141) is elastically engaged with the locking protrusion (1111) so that the sealing ring (12) and the valve body (11) are relatively fixed.

2. A coal gas relief valve (10) according to claim 1, characterised in that The horizontal projection of the sealing surface (131) is circular, and the diameter of the horizontal projection of the sealing surface (131) is greater than the inner diameter of the sealing ring (12) and smaller than the outer diameter of the sealing ring (12).

3. The gas venting valve (10) according to claim 2, characterized in that, The upper end of the sealing ring (12) has a sealing concave surface (121) that is adapted to the shape of the sealing curved surface (131).

4. The gas venting valve (10) according to claim 1, characterized in that, The notch (113) includes a horizontally arranged bottom wall (1131), and the bottom wall (1131) is recessed with an annular recess (1132) extending circumferentially along the opening (112).

5. The gas venting valve (10) according to claim 4, characterized in that, The notch (113) also includes a groove sidewall (1133) connected to the groove bottom wall (1131) and arranged vertically. The groove sidewall (1133) is provided with an annular rib (1134) extending circumferentially along the opening (112). The outer peripheral wall of the sealing ring (12) is provided with an annular groove (122) adapted to the shape of the annular rib (1134).

6. A gas holder, characterized in that, The device includes a cabinet, a fixing plate (20), and a gas venting valve (10) as described in any one of claims 1 to 5; the gas venting valve (10) is located in the lower part of the inner cavity of the cabinet; the fixing plate (20) is located in the upper part of the inner cavity of the cabinet and is fixedly connected to the inner wall of the cabinet; the fixing plate (20) is provided with a winding mechanism (21); a lifting rope (22) is wound around the winding mechanism (21); the free end of the lifting rope (22) is connected to the valve cover (13) of the gas venting valve (10); the winding mechanism (21) is used to lift or lower the valve cover (13) by winding or unwinding the lifting rope (22).

7. The gas holder according to claim 6, characterized in that, The outer wall of the valve body (11) of the gas venting valve (10) is provided with a mounting base (114), and the upper end of the mounting base (114) is provided with a guide rod (115) extending vertically. The upper end of the guide rod (115) is higher than the upper end of the sealing ring (12) of the gas venting valve (10); the valve cover (13) is provided with a guide hole (132) that guides and cooperates with the guide rod (115).

8. The gas holder according to claim 7, characterized in that, Two guide rods (115) are provided, and the two guide rods (115) are respectively located on both sides of the valve body (11); two guide holes (132) are provided, and the two guide holes (132) are respectively located on both sides of the valve cover (13), and the two guide holes (132) are respectively guided and engaged with the two guide rods (115).

9. The gas holder according to claim 8, characterized in that, The gas holder also includes two guide ropes (30); the lower ends of the two guide ropes (30) are respectively connected to the upper ends of the two guide rods (115), and the upper ends of the two guide ropes (30) are respectively connected to the fixing plate (20). The distance between the connection points of the two guide ropes (30) on the fixing plate (20) is equal to the distance between the two guide rods (115).

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