Valve cover and gas pipeline micro-leakage automatic shut-off valve thereof

Abstract

The utility model discloses a valve cover and a gas pipeline micro-leakage automatic shut-off valve thereof, and relates to the technical field of structural design of gas pipeline safety equipment. The valve cover comprises a cover body and a conducting piece, the cover body is installed in a fuel gas channel, the cover body is communicated with the outside of the fuel gas channel through the conducting piece, the outer wall of one end of the conducting piece is connected with the cover body in a sealed mode, and the other end of the conducting piece is connected with the fuel gas channel in a sealed mode. The gas pipeline micro-leakage automatic shut-off valve comprises a valve cover and further comprises a leather membrane assembly and a valve shell, and the leather membrane assembly is connected between the valve cover and the valve shell in a pressing and sealing mode. According to the valve cover and the gas pipeline micro-leakage automatic closing valve thereof, external atmospheric pressure is conducted through the conducting piece fixed by the cover body, a stable air pressure cavity communicated with the external atmospheric pressure is generated between the valve cover and one side of the leather membrane in the gas valve, and when micro-leakage occurs, due to the fact that the conducting piece conducts the atmospheric pressure, the leather membrane can drive the gas channel to be closed. Due to the integrated design of the extension cylinder, the overall structural strength of the valve cover is enhanced.

Description

Technical Field

[0001] This utility model relates to the technical field of structural design of safety equipment for gas pipelines, and in particular to a valve cover and its automatic shut-off valve for micro-leakage in gas pipelines. Background Technology

[0002] Natural gas, as an important energy source, is widely used in residential and industrial production. However, gas leaks can cause serious safety accidents such as fires and explosions, making safety protection equipment for gas pipelines particularly important. Current technology uses automatic shut-off valves for gas pipelines to control leaks primarily by detecting pressure changes or gas concentration, but these methods still have many shortcomings in practical applications.

[0003] The response mechanism of existing automatic shut-off valves suffers from lag. While the valves are driven by pressure differentials, their internal air pressure chamber design is flawed, resulting in a failure to respond quickly to minor leaks. In the early stages of a minor leak, the pressure change is small, making it difficult for the diaphragm or actuating components of traditional valves to trigger the shut-off action quickly, creating a safety hazard. Furthermore, the existing valve cover structure lacks sufficient buffering capacity against pressure fluctuations, making it prone to stress concentration during long-term use, leading to component fatigue or deformation and affecting service life.

[0004] Secondly, existing valves have defects in sealing performance. Some valve bodies adopt a split structure design, and the connection between components is prone to material aging, making it difficult to completely block micro-leakage of gas. Even with the addition of sealing rings, their installation position and structural design may be deformed due to long-term pressure impact, thereby reducing sealing performance.

[0005] It is evident that the existing gas valve cover structure is prone to component fatigue or deformation due to stress concentration during long-term use, and has defects in sealing performance. Furthermore, the existing technology cannot achieve an automatic shut-off valve in case of minor leakage. Utility Model Content

[0006] In view of this, the main purpose of this utility model is to provide a valve cover and its gas pipeline micro-leakage automatic shut-off valve, which can solve the problems that the existing technology cannot achieve micro-leakage automatic shut-off, the valve cover structure is prone to component fatigue or deformation due to stress concentration during long-term use, and the sealing performance is defective.

[0007] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0008] The valve cover includes: a cover body and a guide member. The cover body is installed inside the gas passage. The cover body is connected to the outside of the gas passage through the guide member. One end of the guide member is sealed to the cover body, and the other end of the guide member is sealed to the gas passage.

[0009] In a preferred embodiment, the cover body includes a connecting ring, a pressing plate, and a sealing cylinder. One end of the sealing cylinder is open, and the pressing plate is integrally formed at the opening of the sealing cylinder. The pressing plate extends outward from the sealing cylinder, and the connecting ring is integrally formed on the outside of the pressing plate.

[0010] In a preferred embodiment, the connecting ring and the clamping plate are integrally formed by an extension cylinder that extends away from the sealing cylinder.

[0011] In a preferred embodiment, a sealing groove is provided between the extension cylinder and the pressing plate, and a sealing ring is provided inside the sealing groove.

[0012] In a preferred embodiment, the conductive element includes: a first sealing part, an elongated part, and a second sealing part, wherein the first sealing part, the elongated part, and the second sealing part are formed sequentially in one piece, the first sealing part is sealed to the sealing cylinder, and the second sealing part is sealed to the gas valve pipeline.

[0013] In a preferred embodiment, a through hole is formed through the center of the first sealing portion, the elongated portion, and the second sealing portion.

[0014] In a preferred embodiment, the outer diameters of the first sealing portion, the elongated portion, and the second sealing portion increase sequentially.

[0015] In a preferred embodiment, the first sealing part and the second sealing part are provided with external sealing threads on their exteriors, and an internal sealing thread is provided through the side wall of the sealing cylinder, wherein the external sealing thread and the internal sealing thread of the first sealing part are sealed together.

[0016] In a preferred embodiment, the guide further includes a limiting plate, wherein the end of the second sealing portion away from the elongated portion is integrally formed with the limiting plate, and the guide hole penetrates the limiting plate.

[0017] In a preferred embodiment, a slot is formed on the side of the limiting plate away from the second sealing part.

[0018] The automatic shut-off valve for minor leaks in the gas pipeline includes the aforementioned valve cover, as well as a diaphragm assembly and a valve body, with the diaphragm assembly being press-sealed between the valve cover and the valve body.

[0019] The valve cover and its automatic shut-off valve for minor leaks in gas pipelines according to this utility model have the following beneficial effects:

[0020] The valve cover includes a cover body and a guide member. The cover body is installed inside the gas passage and is connected to the outside of the gas passage through the guide member. One end of the guide member is sealed to the outer wall of the cover body, and the other end of the guide member is sealed to the gas passage. The automatic shut-off valve for micro-leakage in gas pipelines includes a valve cover, a diaphragm assembly, and a valve body. The diaphragm assembly is press-sealed between the valve cover and the valve body.

[0021] This valve cover and its automatic leak-proof valve for gas pipelines utilize an external atmospheric pressure-conducting component fixed to the cover body. This creates a stable pressure chamber inside the gas valve between the valve cover and the diaphragm, communicating with the external atmospheric pressure. When a leak occurs, the diaphragm is actuated to close the gas passage because the conductive component allows atmospheric pressure to pass through. The integrated design of the extension cylinder enhances the overall structural strength of the valve cover and increases the space within the sealing cylinder, effectively preventing material fatigue or deformation caused by long-term pressure impacts and ensuring the stability and durability of the valve cover under high-pressure environments. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. 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.

[0023] Figure 1 This is a schematic diagram of the structure of a valve cover according to one embodiment of the present disclosure;

[0024] Figure 2 This is a schematic diagram of the cover body structure of a valve cover according to one embodiment of the present disclosure;

[0025] Figure 3 This is a schematic diagram of the cover body of the valve cover according to one embodiment of the present disclosure from another angle.

[0026] Figure 4 A cross-sectional view of the cover body of a valve cover according to one embodiment of the present disclosure;

[0027] Figure 5 This is a schematic diagram of the conductive element of an automatic shut-off valve for minor leaks in a gas pipeline according to one embodiment of the present disclosure;

[0028] Figure 6 This is a schematic diagram of the conductor structure of an automatic shut-off valve for minor leaks in a gas pipeline according to one embodiment of the present disclosure from another angle.

[0029] Figure 7 A cross-sectional view of the conductor of an automatic shut-off valve for minor leaks in a gas pipeline according to one embodiment of this disclosure;

[0030] Figure 8 This is a cross-sectional view of the valve body and valve cover clamping diaphragm of an automatic shut-off valve for micro-leakage of a gas pipeline according to an embodiment of the present disclosure.

[0031] Figure 9 This is a cross-sectional view of an automatic shut-off valve for minor leaks in a gas pipeline according to one embodiment of the present disclosure.

[0032] [Explanation of Key Component Symbols]

[0033] 01. Valve housing;

[0034] 02. Valve cover;

[0035] 021. Cover the main body;

[0036] 0211. Connecting ring; 0212. Pressure plate; 0213. Sealing cylinder;

[0037] 022. Conductor;

[0038] 0221, First sealing part; 0222, Elongated part; 0223, Second sealing part; 0224, Limiting plate;

[0039] 8. Extension tube;

[0040] 9. Sealing groove;

[0041] 10. Sealing ring;

[0042] 11. Through hole;

[0043] 12. Seal the external thread;

[0044] 13. Sealing internal thread;

[0045] 03. Membrane assembly;

[0046] 0001. Gas passage. Detailed Implementation

[0047] The following description, in conjunction with the accompanying drawings and embodiments of the present invention, provides a more detailed account of a valve cover and its automatic shut-off valve for minor leaks in gas pipelines.

[0048] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0049] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0051] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0052] according to Figures 1-9As shown, the valve cover 02 includes a cover body 021 and a conductor 022. The automatic shut-off valve for minor gas pipeline leaks is fixedly connected to the gas passage 0001, and the cover body 021 is installed inside the gas passage 0001. To enable the conductor 022 of the cover body 021 to connect to external atmospheric pressure, in the event of a minor gas pipeline leak, the diaphragm inside the shut-off valve can respond promptly and close, sealing and blocking the gas flow. The cover body 021 is connected to the outside of the gas passage 0001 through the conductor 022. The valve cover 02 connecting ring has multiple openings. A diaphragm assembly 03 is pressed and sealed between the valve cover 02 and the valve body 01; that is, the diaphragm of the diaphragm assembly 03 is located between the valve cover 02 and the valve body 01. One end of the conductor 022 is sealed to the outer wall of the cover body 021, and the other end is sealed to the gas passage 0001, allowing external atmospheric pressure to pass through. This creates a stable pressure chamber inside the gas valve between the valve cover 02 and one side of the diaphragm, communicating with the external atmospheric pressure. When a minor leak occurs, the pressure on the side of the diaphragm fixed to the valve body 01 decreases, while the pressure on the side of the diaphragm fixed to the valve cover 02 remains constant due to the connection with the external atmospheric pressure. This pressure difference causes the diaphragm assembly 03 to drive the diaphragm towards the valve body 01, sealing and blocking the gas supply. When gas is supplied normally, the pressure on the side of the diaphragm fixed to the valve body 01 increases, exceeding the pressure chamber on the side of the diaphragm fixed to the valve cover 02. Under the pressure difference, the diaphragm maintains its elastic deformation, keeping the gas passage open and ensuring normal gas supply.

[0053] To create an independent cavity between the valve cover 02 and the diaphragm after the valve is fixedly connected, the cover body 021 includes a connecting ring 0211, a clamping plate 0212, and a sealing cylinder 0213. One end of the sealing cylinder 0213 is open, and the clamping plate 0212 is integrally formed at the opening of the sealing cylinder 0213. The clamping plate 0212 extends outward from the sealing cylinder 0213, and the connecting ring 0211 is integrally formed on the outside of the clamping plate 0212. Through the integral forming of the connecting ring 0211, the clamping plate 0212, and the sealing cylinder 0213, and through the unique shape of the annular opening at one end of the sealing cylinder 0213, an independent cavity is formed between the valve cover 02 and the diaphragm inside the valve body, within the sealing cylinder 0213. Through the pressure chamber connected to the outside, the diaphragm actuates under pressure differential when a slight leak occurs in the gas passage. Because the external air pressure is relatively stable, when the gas pressure on the blocking side fluctuates due to a slight leak, the diaphragm can quickly respond to the change in pressure difference between the two sides, rapidly deforming the diaphragm to close the gas passage. The connecting ring 0211 connects the diaphragm to its valve body 01, ensuring sealing and connection strength. The stepped shape of the pressure plate 0212 and the connecting ring sealing cylinder 0213 guides the gas flow direction, reduces turbulence and local pressure fluctuations, further reduces friction, and thus extends the service life of the diaphragm and valve body components.

[0054] To ensure the connection strength of the valve cover 02, the connecting ring 0211 and the clamping plate 0212 are integrally formed by an extension cylinder 8, which extends away from the sealing cylinder 0213. The integrated design of the extension cylinder 8 enhances the overall structural strength of the valve cover 02 and increases the space inside the sealing cylinder 0213, effectively avoiding material fatigue or deformation caused by long-term pressure impact, and ensuring the stability and durability of the valve cover 02 under high pressure environment.

[0055] To further improve sealing performance, a sealing groove 9 is provided between the extension cylinder 8 and the pressure plate 0212, and a sealing ring 10 is installed inside the sealing groove 9. The sealing ring 10, installed within the sealing groove 1, can tightly fit the surface of the connection, filling gaps and irregularities, effectively preventing gas leakage. The combination of the sealing groove 9 and the sealing ring 10 forms a double seal, further improving the sealing performance of the valve cover 02's connection with other components. This is achieved through two mechanisms: firstly, the effect of thermal expansion and contraction between the elastic sealing ring 10 and its connection point; and secondly, the shape constraint of the sealing groove 9 enhances sealing reliability, ensuring effective prevention of gas leakage even under different temperature or vibration conditions.

[0056] To allow the valve body to be connected to external atmospheric pressure, the conductive component 022 includes: a first sealing part 0221, an elongated part 0222, and a second sealing part 0223. The first sealing part 0221, the elongated part 0222, and the second sealing part 0223 are formed sequentially in one piece. The first sealing part 0221 is sealed to the sealing cylinder 0213, and the second sealing part 0223 is sealed to the gas passage 0001. To connect the first sealing part 0221, the valve cover 02 has a threaded hole on the side wall of its sealing cylinder 0213. The first sealing part 0221 and the second sealing part 0223 respectively seal the gas passage 0001 and the valve cover 02. To further ensure the sealing effect, sealing gaskets are installed at the connection between the first sealing part 0221 and the sealing cylinder 0213, and at the connection between the second sealing part 0223 and the gas passage 0001. A through hole 11 is formed through the center of the first sealing part 0221, the elongated part 0222, and the second sealing part 0223. The through-hole 11 begins at the second sealing part 0223, passes through the extension part 0222 to the first sealing part 0221, and penetrates the center of the guide member 022, ensuring that gas can enter the extension part 0222 from the through-hole 11 on the side of the first sealing part 211 and flow out from the through-hole 11 on the side of the second sealing part 0223. This connects the inside of the valve cover 02 to the outside atmosphere, providing a stable pressure chamber within the valve cover 02 that is in communication with the external air pressure. This allows the diaphragm to respond quickly to changes in the pressure difference between the inside and outside of the gas passage 0001, achieving the function of micro-leakage closure.

[0057] To facilitate the fixed connection of the conductor 022 to the valve cover 02, the outer diameters of the first sealing part 0221, the elongated part 0222, and the second sealing part 0223 are sequentially increased. This stepped design with increasing outer diameters makes the assembly process of the conductor 022 and the valve cover 02 more efficient. Specifically, the stepped shape at the connection between the elongated part 0222 and the limiting plate 0224 allows the limiting plate 0224 to limit the elongated part 0222 after it extends into the opening of the gas passage 0001. The first sealing part 0221 is threadedly connected to the valve cover 02 at the sealing internal thread 13. Similarly, the stepped shape at the connection between the elongated part 0222 and the first sealing part 0221 further limits the elongated part 0222. This ensures that when the conductor 4 is rotated, the threaded structure of the first sealing part 0221 and the second sealing part 0223 can simultaneously provide a threaded sealing connection between the gas passage 0001 and the valve cover 02. By using a progressive fit to reduce installation resistance, and by utilizing contact surfaces of different diameters to enhance radial fixing effect, assembly efficiency and connection stability are improved.

[0058] To secure the conductor 022, the valve cover 02 is then fixedly connected via the conductor 022. The first sealing part 0221 and the second sealing part 0223 have external sealing threads 12 on their exteriors, and internal sealing threads 13 penetrate the side wall of the sealing cylinder 0213. Correspondingly, the connection between the gas passage 0001 and the second sealing part 0223 also has an internal sealing thread 13. The external sealing thread 12 and the internal sealing thread 13 of the first sealing part 0221 are sealed together. When the valve cover 02 and the valve body 01 are clamped together with a diaphragm for fixation, the first sealing part 0221 of the conductor 022 is threadedly fixedly connected to the valve cover 02, and the second sealing part 0223 of the conductor 022 is threadedly fixedly connected to the gas passage 0001. When the sealing diaphragm assembly 03 is pressed between the valve cover 02 and the valve body 01, the fixation of the conductor 022 further restricts the axial movement of the valve cover 02. The engagement of the sealing external thread 12 and the sealing internal thread 13 not only achieves axial tightening, but also limits the radial displacement of the valve cover 02 through the preload generated by the thread engagement, avoiding loosening caused by gas impact or mechanical vibration, and ensuring long-term sealing performance.

[0059] To further limit and fix the conductive element 022, the conductive element 022 also includes: a limiting plate 0224, with the second sealing part 0223 having the limiting plate 0224 integrally formed at the end away from the elongated part 0222, and a through hole 11 penetrating the limiting plate 0224. The integral design of the limiting plate 0224 and the conductive element 022 mechanically limits and prevents axial loosening of the conductive element 022 due to loosening of its threaded connection over a long period of use. The limiting plate 0224 also acts to press and fix the sealing ring, further reinforcing the overall structure and preventing gas leakage.

[0060] To facilitate the external installation of the conductor 022, a slot is provided on the side of the limiting plate 0224 away from the second sealing part 0223. The slot design of the limiting plate 0224 is compatible with standard tools, such as flathead screwdrivers, making the installation and removal of the conductor 022 more convenient, reducing maintenance difficulty, and avoiding damage to components caused by tool slippage, thereby improving operational safety and efficiency.

[0061] according to Figure 9 As shown, this automatic shut-off valve for minor gas leaks includes the aforementioned valve cover 02, a diaphragm assembly 03, and a valve body 01. The diaphragm assembly 03 is press-sealed between the valve cover 02 and the valve body 01. Through the press-fitting of the valve cover 02 and the valve body 01, the diaphragm assembly 03 can respond rapidly when a minor leak occurs, automatically cutting off the gas passage through changes in gas pressure balance and pressure difference. This valve has a compact structure, high reliability, and is suitable for residential and industrial gas pipeline networks, significantly reducing safety hazards caused by gas leaks.

[0062] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model.

Claims

1. A valve cover, characterized in that, include: The cover body (021) and the guide (022) are installed inside the gas passage (0001). The cover body (021) is connected to the outside of the gas passage (0001) through the guide (022). One end of the outer wall of the guide (022) is sealed to the cover body (021), and the other end of the guide (022) is sealed to the gas passage (0001).

2. The valve cover according to claim 1, characterized in that, The cover body (021) includes: a connecting ring (0211), a pressing plate (0212), and a sealing cylinder (0213). One end of the sealing cylinder (0213) is open. The pressing plate (0212) is integrally formed at the opening of the sealing cylinder (0213). The pressing plate (0212) extends outward from the sealing cylinder (0213). The connecting ring (0211) is integrally formed on the outside of the pressing plate (0212).

3. The valve cover according to claim 2, characterized in that, The connecting ring (0211) and the clamping plate (0212) are integrally formed by an extension cylinder (8), which extends away from the sealing cylinder (0213).

4. The valve cover according to claim 3, characterized in that, A sealing groove (9) is provided between the extension cylinder (8) and the pressing plate (0212), and a sealing ring (10) is provided inside the sealing groove (9).

5. The valve cover according to any one of claims 2-4, characterized in that, The conductive component (022) includes: a first sealing part (0221), an elongated part (0222), and a second sealing part (0223). The first sealing part (0221), the elongated part (0222), and the second sealing part (0223) are formed in sequence in one step. The first sealing part (0221) and the sealing cylinder (0213) are sealed together, and the second sealing part (0223) is sealed together with the gas valve pipeline. A through hole (11) is provided through the center of the first sealing part (0221), the elongated part (0222) and the second sealing part (0223).

6. The valve cover according to claim 5, characterized in that, The outer diameters of the first sealing part (0221), the elongated part (0222), and the second sealing part (0223) increase sequentially.

7. The valve cover according to claim 6, characterized in that, The first sealing part (0221) and the second sealing part (0223) are provided with sealing external threads (12) on the outside and sealing internal threads (13) are provided through the side wall of the sealing cylinder (0213). The sealing external threads (12) and sealing internal threads (13) of the first sealing part (0221) are sealed together.

8. The valve cover according to claim 7, characterized in that, The guide member (022) further includes: a limiting plate (0224), wherein the end of the second sealing part (0223) away from the elongated part (0222) is integrally formed into the limiting plate (0224), and the through hole (11) penetrates the limiting plate (0224).

9. The valve cover according to claim 8, characterized in that, A slot is formed on the side of the limiting plate (0224) away from the second sealing part (0223).

10. An automatic shut-off valve for minor leaks in gas pipelines, characterized in that, The valve cover includes any one of claims 1-9, and further includes a diaphragm assembly (03) and a valve body (01), wherein the diaphragm assembly (03) is press-sealed between the valve cover (02) and the valve body (01).

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