Gas emergency shut-off valve

Abstract

The utility model discloses a kind of gas emergency cut-off valves, including valve body, the valve cover of being detachably connected with valve body, the shell that can contain valve cover in and be detachably connected with valve cover, be located in shell to be used to control the execution component of air passage opening or closing in valve body and limiting mechanism, limiting mechanism is used to limit the circumferential rotation of shell relative to valve body occurs to prevent shell around its assembly axis with valve body horizontal rotation, by setting limiting mechanism, solve the circumferential rotation problem of shell relative to valve body, ensure the assembly position stability of internal execution component, guarantee cut-off valve can always normally play the core function of control air passage switch in long-term use, so that in gas leakage, pressure abnormality and other dangerous working conditions, cut-off valve can accurately, fast cut-off gas passage, guarantee the safety of gas supply system.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a gas emergency shut-off valve. Background Technology

[0002] As a key device to ensure the safety of gas transmission, the gas emergency shut-off valve is widely used in gas supply systems in homes and industries. Its core function is to quickly cut off the gas supply when dangerous conditions such as gas leaks or abnormal pressure are detected, so as to prevent safety accidents.

[0003] Gas emergency shut-off valves typically consist of a valve body, valve cover, and housing. The valve body forms the gas passage, the valve cover is detachably connected to the valve body for internal component maintenance, and the housing is installed in conjunction with the valve cover. Because the housing needs to be detachably connected to the valve cover for easy maintenance, current shut-off valves often only achieve axial fixation after assembly, lacking a dedicated circumferential limiting mechanism. In this situation, the housing is prone to horizontal rotation relative to the valve body due to pipeline vibration, accidental external force, or wear after long-term use. This could cause internal component actuation failure, weakening the shut-off valve's safety protection function. Utility Model Content

[0004] In view of the technical problems existing in the prior art, this utility model provides a gas emergency shut-off valve.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A gas emergency shut-off valve includes a valve body, a valve cover detachably connected to the valve body, a housing capable of housing the valve cover and detachably connected to the valve cover, an actuator disposed within the housing for controlling the opening or closing of a gas passage within the valve body, and a limiting mechanism for limiting circumferential rotation of the housing relative to the valve body to prevent horizontal rotation of the housing about its assembly axis with the valve body.

[0007] Furthermore, the limiting mechanism includes a first limiting member fixed to the outer wall of the housing, and a second limiting member disposed on the outer wall of the valve body and adapted to the first limiting member.

[0008] Furthermore, the first limiting member protrudes from the housing toward the direction close to the valve body, and the first limiting member has a limiting groove with an open end close to the valve body and horizontally penetrating itself; the second limiting member is a protrusion located at a corresponding position on the outer wall of the valve body, and the protrusion can be fitted into the limiting groove to limit the circumferential rotation of the housing relative to the valve body.

[0009] Furthermore, the limiting groove is a U-shaped groove, and the edge of the limiting groove has two first arc transition portions. The first arc transition portions extend smoothly from the edge of the groove to the inside of the groove, so that the groove forms a flared curved surface guide structure.

[0010] Furthermore, the root of the protrusion is provided with a plurality of first arc portions that correspond one-to-one with the first arc transition portions; the two sides of the end face away from the root of the protrusion are respectively provided with second arc transition portions, which extend smoothly from the edge of the end face to the side of the protrusion.

[0011] Furthermore, the first limiting member has a second arc portion at the end away from the slot, and the second arc portion is recessed from the surface of the first limiting member toward the housing to form an inwardly concave curved surface.

[0012] Furthermore, the valve cover includes a threaded portion that is screwed to the valve body, a flange disposed above the threaded portion, a first valve cover section disposed at the upper end of the flange, and a second valve cover section disposed at the upper end of the first valve cover section. The top surface of the flange can form a groove with the first valve cover section and the second valve cover section. The inner wall of the housing is provided with a plurality of protrusions that can cooperate and connect with the groove.

[0013] Furthermore, the actuating component includes a valve stem with one end passing through the valve cover, a valve core located at the bottom of the valve stem and corresponding to the valve port position in the valve body, a return spring sleeved on the valve stem and abutting between the valve core and the valve cover, an electromagnetic coil connected to the valve stem and located in the housing, and a handle connected to the top of the valve stem and located outside the housing. A valve cap for covering the handle is detachably connected to the housing.

[0014] In summary, the beneficial effects of this utility model are as follows: 1. By setting a limiting mechanism (the first limiting member on the outer wall of the housing and the second limiting member on the outer wall of the valve body are in a concave-convex fit), the circumferential rotation of the housing relative to the valve body is restricted, ensuring the long-term stability of the alignment accuracy of the actuators (such as the valve stem, valve core, and electromagnetic components) and the valve port inside the valve body, avoiding malfunction of the gas passage control due to rotation. It ensures that the fit between the housing and the valve body gas passage remains unchanged, allowing the shut-off valve to quickly and accurately cut off the passage in dangerous conditions such as gas leakage and abnormal pressure. 2. The limiting mechanism provides rigid circumferential constraint for the housing and valve body, reducing the impact of pipeline vibration, accidental external force contact, and other factors on the shut-off valve structure; the concave-convex fit (groove and protrusion) between the valve cover and the housing further enhances axial fixation, enabling the overall structure to remain stable under dynamic conditions and significantly improving anti-interference capabilities. III. Optimized surface design of the limiting mechanism (first arc transition part of the U-shaped groove, first arc part and second arc transition part of the second limiting member, second arc part on the first limiting member) disperses stress and reduces rigid friction, thus preventing wear and cracks in the components due to long-term rotation or vibration. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a gas emergency shut-off valve provided by this utility model.

[0016] Figure 2 yes Figure 1 Top view.

[0017] Figure 3 yes Figure 2 Sectional view along line AA.

[0018] Figure 4 This is a three-dimensional structural diagram of the valve cover in this utility model.

[0019] Figure 5 This is a three-dimensional structural diagram of the connection between the first limiting member and the shell in this utility model.

[0020] Figure 6 This is a three-dimensional structural diagram of the connection between the second limiting member and the valve body in this utility model.

[0021] In the figure, 100-valve body, 110-air passage, 111-valve port, 200-valve cover, 210-screwed part, 220-flange, 230-first valve cover section, 240-second valve cover section, 300-housing, 310-protrusion, 400-actuator, 410-valve stem, 420-valve core, 430-electromagnetic coil, 440-handle, 500-limiting mechanism, 510-first limiting member, 511-limiting groove, 5110-first arc transition part, 512-second arc part, 520-second limiting member, 521-first arc part, 522-second arc transition part, 600-valve cap. Detailed Implementation

[0022] The present invention will be further illustrated below with reference to specific figures.

[0023] Please see Figure 1 , Figure 2 and Figure 3 This utility model provides a gas emergency shut-off valve, including a valve body 100, a valve cover 200 screwed to the valve body 100, a housing 300 that can accommodate the valve cover 200 and is detachably connected to the valve cover 200, an actuator 400 disposed in the housing 300 for controlling the opening or closing of the gas passage 110 inside the valve body 100, and a limiting mechanism 500. The limiting mechanism 500 is used to limit the housing 300 from circumferentially rotating relative to the valve body 100 to prevent the housing 300 from horizontally rotating about its assembly axis with the valve body 100. By setting a limiting mechanism 500, the circumferential rotation problem of the housing 300 relative to the valve body 100 is solved. This prevents the rotation of the housing 300 from easily causing the failure of the drive of the internal actuator 400 (such as the component controlling the opening and closing of the gas passage 110), ensuring the stable assembly position of the internal actuator 400. This guarantees that the shut-off valve can always perform its core function of controlling the opening and closing of the gas passage 110 during long-term use, enabling the shut-off valve to accurately and quickly cut off the gas passage in dangerous conditions such as gas leaks and abnormal pressure, ensuring the safety of the gas supply system. The limiting mechanism 500 provides circumferential constraint on the connection between the housing 300 and the valve body 100, reducing the impact of pipeline vibration, accidental contact by external forces, and other factors on the shut-off valve structure, improving the overall structural stability and anti-interference capability of the device. In addition, it can also avoid component wear caused by long-term rotational friction between the housing 300 and the valve body 100, reducing the probability of failure due to wear, extending the service life of the shut-off valve, and reducing maintenance costs.

[0024] Please see Figure 4The valve cover 200 includes a threaded portion 210 screwed to the valve body 100, a flange 220 disposed above the threaded portion 210, a first valve cover section 230 disposed at the upper end of the flange 220, and a second valve cover section 240 disposed at the upper end of the first valve cover section 230. The top surface of the flange 220, the outer wall of the first valve cover section 230, and the outer wall of the second valve cover section 240 together form a groove. The outer diameter of the flange 220 is larger than the outer diameter of the threaded portion 210 and the outer diameter of the first valve cover section 230, respectively. The cross-sectional area of ​​the second valve cover section 240 gradually increases from the top surface to the bottom surface, and the outer diameter of the bottom surface at its maximum point is larger than the outer diameter of the first valve cover section 230. A plurality of protrusions 310 are arranged at intervals on the inner wall of the housing 300, and the protrusions 310 can be connected with the groove. The valve cover 200 forms a groove through the dimensional difference between the flange 220, the first valve cover section 230, and the second valve cover section 240. This groove forms a concave-convex fit with the protrusion 310 on the inner wall of the housing 300. This provides a clear positioning reference when assembling the housing 300 and the valve cover 200, guiding the housing 300 to quickly align with the installation position, reducing assembly errors, and improving assembly efficiency. The outer diameter of the flange 220 is larger than that of the screw connection 210 and the first valve cover section 230. When the protrusion 310 is embedded in the groove, the top surface of the flange 220 will axially block the protrusion 310 (restricting the downward movement of the housing 300), while the outer wall of the second valve cover section 240 (especially the bottom outer diameter, which is larger than that of the first valve cover section 230) will provide reverse support to the protrusion 310 (restricting the upward movement of the housing 300). This achieves bidirectional axial fixation between the housing 300 and the valve cover 200, preventing the housing 300 from falling off under vibration or external force. The cooperation between the groove and the protrusion 310 can help enhance the circumferential constraint. After the multiple spaced protrusions 310 are embedded in the groove, the friction of the contact surface and the structural limit can further prevent the housing 300 from rotating circumferentially relative to the valve cover 200 (and valve body 100). This works in conjunction with the special limiting mechanism 500 to enhance the anti-rotation effect.

[0025] Please continue reading. Figure 3The actuator 400 includes a valve stem 410 with one end passing through the valve cover 200, a valve core 420 located at the bottom of the valve stem 410 and corresponding to the position of the valve port 111 inside the valve body 100, a return spring (not shown) sleeved on the valve stem 410 and abutting between the valve core 420 and the valve cover 200, an electromagnetic coil 430 connected to the valve stem 410 and located inside the housing 300, and a handle 440 connected to the top of the valve stem 410 and located outside the housing 300. A moving iron core is installed in the electromagnetic coil 430, a permanent magnet is embedded in the housing 300, and the housing 300 is also fitted with a valve cap 600 for covering the handle 440 by snap-fit ​​or screw-fit. After removing the valve cap 600, hold the handle 440 and pull the valve stem 410 upwards. This will cause the valve core 420 to move away from the valve port 111. At this time, the return spring is compressed and accumulates elastic potential energy. When the valve core 420 is completely separated from the valve port 111, the moving iron core moves upwards with the valve stem 410 to the magnetic field area of ​​the permanent magnet. The attraction force of the permanent magnet on the moving iron core is greater than the elastic restoring force of the return spring, so that the valve stem 410 is stably locked in the raised position, and the gas passage 110 remains open. When a dangerous condition such as gas leakage is detected, the electromagnetic coil 430 is energized to generate a reverse magnetic field. This reverse magnetic field significantly weakens the attraction force of the permanent magnet on the moving iron core. At this time, the return spring releases its elastic potential energy, pushing the moving iron core to drive the valve stem 410 downwards. The valve core 420 then moves downwards and closely fits the valve port 111, ultimately cutting off the gas passage.

[0026] The limiting mechanism 500 includes a first limiting member 510 fixed to the outer wall of the housing 300, and a second limiting member 520 provided on the outer wall of the valve body 100 and adapted to the first limiting member 510. The first limiting member 510 protrudes from the housing 300 toward the valve body 100, and has a limiting groove 511 with an open end near the valve body 100 and horizontally penetrating it. The second limiting member 520 is a protrusion provided at a corresponding position on the outer wall of the valve body 100, which can be fitted into the limiting groove 511 to limit the circumferential rotation of the housing 300 relative to the valve body 100. Both the first limiting member 510 and the second limiting member 520 are simple mechanical structures that do not require complex driving components. When the housing 300 and valve cover 200 (or valve body 100) are assembled using detachable methods such as snap-fit ​​or screw-fit, the limiting groove 511 and the protrusion can be aligned and snapped in synchronously with the axial installation of the housing 300, without adding any additional assembly steps. During disassembly and maintenance, simply disconnecting the housing 300 from the valve cover 200 will allow the protrusion to disengage from the limiting groove 511, balancing limiting reliability with ease of disassembly and assembly, making it suitable for scenarios where gas emergency shut-off valves require regular maintenance.

[0027] Please see Figure 5The limiting groove 511 is a U-shaped groove. At the edge of the groove opening, there are two first arc transition portions 5110. These first arc transition portions 5110 smoothly extend from the groove edge towards the inside of the groove, forming a flared curved surface guide structure. This flared curved surface guide structure provides a funnel-shaped guide for the second limiting member 520 (protrusion) during assembly of the housing 300 and valve body 100. When the protrusion approaches the limiting groove 511, even with slight axial or radial deviations, the curved surface of the first arc transition portion 5110 can gradually correct the protrusion's movement trajectory through contact, allowing the protrusion to smoothly slide into the U-shaped groove along the curved surface. Compared to a right-angle groove, this design avoids rigid collisions or jamming between the protrusion and the groove edge, significantly reducing the difficulty of alignment during assembly. When the housing 300 is subjected to rotational force, the protrusion will abut against the wall of the U-shaped groove to achieve limiting. The first arc transition portion 5110 of the slot can disperse the impact force of the protrusion entering the slot from the edge concentration point to the curved surface area, avoiding cracking and deformation of the slot edge due to long-term stress (especially for brittle materials such as plastics and cast iron). At the same time, the curved surface contact can reduce the wear of the protrusion edges and corners, extending the overall service life of the limiting mechanism 500.

[0028] Please see Figure 6 The root of the protrusion (second limiting member 520) is provided with several first arc portions 521 that correspond one-to-one with the first arc transition portions 5110 with clearance fit. In a pipeline vibration environment, the gap between the protrusion and the limiting groove 511 will cause the two to generate a slight relative movement. The curved surface contact between the first arc portion 521 and the first arc transition portion 5110 can transform "point friction" into "surface friction", reducing the wear rate per unit area; at the same time, the gap between the curved surfaces can buffer the vibration impact force and avoid stress concentration caused by repeated collisions between the root corner and the groove edge, protecting the root of the protrusion and the groove opening of the limiting groove 511 (especially for vulnerable materials such as plastics and die-cast aluminum alloys). The end face of the protrusion away from the root is provided with second arc transition portions 522 on both sides, and the second arc transition portions 522 extend smoothly from the edge of the end face to the side of the protrusion. When the housing 300 is subjected to circumferential rotational force, the end of the protrusion may abut against the inner wall of the U-shaped groove to achieve limiting. The second arc transition section 522 expands the contact area from an "edge line" to a "curved surface zone", dispersing the limiting force over a larger area, reducing the risk of local pressure deformation of the groove wall, and preventing cracking at the end of the protrusion due to stress concentration.

[0029] The first limiting member 510 has a second arcuate portion 512 at its end furthest from the slot. The second arcuate portion 512 is recessed from the surface of the first limiting member 510 toward the housing 300 to form a concave curved surface. The first limiting member 510 protrudes outward from the housing 300, and the end furthest from the slot (i.e., the root region connected to the housing 300) is a critical area of ​​stress concentration. When the housing 300 is assembled, vibrated, or subjected to limiting forces, this area is prone to tearing due to torque. The concave curved second arcuate portion 512, by replacing right-angle turns with curved transitions, can disperse stress from localized concentration points to a larger curved area, preventing cracks or fractures at the root after long-term use (especially suitable for first limiting members 510 made of brittle materials such as plastics and aluminum alloys). At the same time, the recessed structure can reduce material accumulation at the root, making the stress distribution more uniform, further enhancing the fatigue resistance of the overall structure, preventing the first limiting member 510 from failing due to excessive stress alone, and ensuring the overall stability of the limiting mechanism 500.

[0030] This gas emergency shut-off valve: 1. By setting a limiting mechanism 500 (the first limiting member 510 on the outer wall of the housing 300 and the second limiting member 520 on the outer wall of the valve body 100 are in a concave-convex fit), the circumferential rotation of the housing 300 relative to the valve body 100 is restricted, ensuring the long-term stability of the alignment accuracy between the actuator 400 (such as the valve stem 410, valve core 420, and solenoid components) and the valve port 111 inside the valve body 100, avoiding malfunction of the gas passage 110 due to rotation. It ensures that the fit between the housing 300 and the gas passage 110 of the valve body 100 remains unchanged, allowing the shut-off valve to quickly and accurately cut off the passage in dangerous conditions such as gas leakage and abnormal pressure. II. The limiting mechanism 500 provides rigid circumferential constraints for the housing 300 and the valve body 100, reducing the impact of pipeline vibration, accidental contact by external forces, and other factors on the shut-off valve structure. The concave-convex fit (groove and protrusion 310) between the valve cover 200 and the housing 300 further enhances axial fixation, ensuring the overall structure remains stable under dynamic operating conditions and significantly improving anti-interference capabilities. III. The optimized curved surface design of the limiting mechanism 500 (the first arc transition portion 5110 of the U-shaped groove, the first arc portion 521 and the second arc transition portion 522 of the second limiting member 520, and the second arc portion 512 on the first limiting member 510) disperses stress and reduces rigid friction, preventing wear and cracks in components due to long-term rotation or vibration.

[0031] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structure made using the contents of this utility model specification and drawings, whether directly or indirectly applied to other related technical fields, shall also be within the patent protection scope of this utility model.

Claims

1. A gas emergency shut-off valve, characterized in that: The device includes a valve body, a valve cover detachably connected to the valve body, a housing capable of housing the valve cover and detachably connected to the valve cover, an actuator disposed within the housing for controlling the opening or closing of the internal air passage of the valve body, and a limiting mechanism for limiting circumferential rotation of the housing relative to the valve body to prevent horizontal rotation of the housing about its assembly axis with the valve body.

2. The gas emergency shut-off valve according to claim 1, characterized in that: The limiting mechanism includes a first limiting member fixed to the outer wall of the housing, and a second limiting member disposed on the outer wall of the valve body and adapted to the first limiting member.

3. The gas emergency shut-off valve according to claim 2, characterized in that: The first limiting member protrudes from the housing toward the direction close to the valve body, and the first limiting member has a limiting groove with an open end close to the valve body and horizontally penetrating itself; the second limiting member is a protrusion located on the corresponding position of the outer wall of the valve body, and the protrusion can be fitted into the limiting groove to limit the circumferential rotation of the housing relative to the valve body.

4. The gas emergency shut-off valve according to claim 3, characterized in that: The limiting groove is a U-shaped groove, and the groove opening edge has two first arc transition parts. The first arc transition parts extend smoothly from the groove opening edge to the inside of the groove, so that the groove opening forms a flared curved surface guide structure.

5. The gas emergency shut-off valve according to claim 4, characterized in that: The root of the protrusion is provided with a plurality of first arc portions that correspond one-to-one with the first arc transition portions; the two sides of the end face away from the root of the protrusion are respectively provided with second arc transition portions, which extend smoothly from the edge of the end face to the side of the protrusion.

6. The gas emergency shut-off valve according to claim 2, characterized in that: The first limiting member has a second arc portion at the end away from the slot. The second arc portion is recessed from the surface of the first limiting member toward the direction of the shell to form an inwardly concave curved surface.

7. The gas emergency shut-off valve according to any one of claims 1-6, characterized in that: The valve cover includes a threaded portion that is screwed to the valve body, a flange located above the threaded portion, a first valve cover section located at the upper end of the flange, and a second valve cover section located at the upper end of the first valve cover section. The top surface of the flange can form a groove with the first valve cover section and the second valve cover section. The inner wall of the housing is provided with a plurality of protrusions that can cooperate and connect with the groove.

8. The gas emergency shut-off valve according to claim 7, characterized in that: The actuating component includes a valve stem with one end passing through the valve cover, a valve core located at the bottom of the valve stem and corresponding to the valve port position in the valve body, a return spring sleeved on the valve stem and abutting between the valve core and the valve cover, an electromagnetic coil connected to the valve stem and located in the housing, and a handle connected to the top of the valve stem and located outside the housing. A valve cap for covering the handle is detachably connected to the housing.

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