A safety self-closing valve for pipeline gas

Abstract

The present application relates to pipeline gas equipment technical field, specifically to a kind of pipeline gas safety self-closing valve, including valve body, valve body is provided with valve seat, gas cavity is arranged in valve body, the air inlet, gas outlet and installation port that are communicated with gas cavity are formed in valve body, the valve cover is equipped with the valve cover in the installation port of valve body by screw rod cover, the bottom of valve cover is equipped with diaphragm that position moves up and down with the gas pressure in gas cavity rises and falls, and diaphragm seals installation port, the lower end of diaphragm is equipped with sealing structure for opening or closing sealing of valve seat when diaphragm rises and falls, the ball valve for operator to operate to open and close gas is also installed on the valve body, and ball valve is installed in the section of valve body close to air inlet.This pipeline gas safety self-closing valve, self-closing valve when not aeration, hard sealing body and first sealing ring and valve seat form soft and hard seal, can resist high temperature, fire prevention, in case of gas leakage fire, can extend rescue time.

Description

Technical Field

[0001] This invention relates to the field of pipeline gas equipment technology, specifically to a pipeline gas safety self-closing valve. Background Technology

[0002] Natural gas, as a clean energy source characterized by "low consumption, high returns, low pollution, and high efficiency," has been widely used in people's daily lives and production. Gas pipelines entering homes rely on pressure regulators to adjust medium-high pressure to low pressure. If the regulator fails, excessively high or low pressure entering the home can cause safety accidents. Similarly, using rubber hoses or corrugated pipes connected to stoves can lead to accidents if the connecting pipes detach or break. To address these safety hazards during gas use, it is typically necessary to install safety valves with automatic gas shut-off functions, i.e., self-closing valves. These self-closing valves are installed on the gas system pipelines and automatically shut off when the gas supply pressure is low, high, or the flow is abnormal, ensuring safe gas use without electricity or other external power. However, existing self-closing valves have complex internal structures, mostly using a lever structure to trigger the valve core's opening and closing, resulting in low control precision and poor adaptability to various environments, thus affecting their safety performance. Therefore, we propose a pipeline gas safety self-closing valve. Summary of the Invention

[0003] The purpose of this invention is to provide a pipeline gas safety self-closing valve to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A pipeline gas safety self-closing valve includes a valve body, a valve seat disposed within the valve body, a gas chamber disposed within the valve body, an inlet, an outlet, and an installation port connected to the gas chamber on the valve body, a valve cover disposed at the installation port of the valve body by a screw cover, a diaphragm disposed at the bottom of the valve cover that moves up and down with the rise and fall of the gas pressure in the gas chamber, and the diaphragm seals the installation port, a sealing structure is disposed at the lower end of the diaphragm to open or close the valve seat when the diaphragm moves up and down, and the valve body is also disposed of by a ball valve for the operator to operate to open and close the gas, and the ball valve is disposed at a section of the valve body near the inlet, a valve cap is inserted at the end of the valve body located at the inlet, a filter screen for filtering impurities is disposed inside the valve cap, the filter screen is fixedly installed inside the valve cap by a snap ring.

[0006] Furthermore, the sealing structure includes a disk connected to the lower end of the diaphragm, a magnet adsorbed at the lower end of the disk, a screw inserted through the magnet, a sealing rod threaded onto the screw, and a hard sealing body fixedly connected to the lower end of the sealing rod, which fits against the valve seat to form a sealing structure.

[0007] Furthermore, the sealing structure also includes a baffle that is movably sleeved on the sealing rod for guiding the movement of the hard seal body. The edge of the baffle rests on the upper surface of the valve body mounting port, and the baffle is located below the diaphragm. The lower end of the magnet is connected to a magnet gasket that is sleeved on the hard seal body for protecting the magnet.

[0008] Furthermore, the lower end face of the hard seal body has a spherical crown-shaped structure, and the lateral length of the upper end of the hard seal body is greater than the diameter of the sealing rod. The hard seal body and the sealing rod are integrally formed structures.

[0009] Furthermore, the sealing structure also includes a first sealing ring fitted on the outer surface of the thick section of the hard seal body to form a soft sealing structure with the valve seat.

[0010] Furthermore, the material of the hard seal is made of one of the following: aluminum, iron, or copper alloy.

[0011] Furthermore, a diaphragm pressure plate is connected to the upper middle part of the diaphragm, and a pull rod is connected to the upper end of the diaphragm. The end of the pull rod away from the diaphragm passes through the diaphragm pressure plate and the valve cover in sequence to reach the outside of the valve cover. A pull ring with its lower end installed on the upper surface of the valve cover is movably sleeved on the pull rod. A reset cap inserted into the pull ring is connected to the upper end of the pull rod. A hexagonal nut that presses against the upper surface of the diaphragm pressure plate is threaded onto the lower end of the pull rod below the valve cover.

[0012] Furthermore, the ball valve includes a ball, with second sealing rings embedded in the valve body and valve cap respectively on both sides of the ball to form a sealing surface with the ball. A valve stem is connected to the upper end of the ball, with the end of the valve stem away from the ball passing through the valve body to the outside of the valve body. A handle for adjusting the opening and closing of the ball is connected to the end of the valve stem outside the valve body. A flow-cutting device is installed in the channel of the ball to cut off the gas flow when it is too large or too small.

[0013] Furthermore, the flow-through device includes a first pipe fixedly connected to the sphere and having a through hole. A second pipe with a through hole is sleeved on the side of the first pipe near the air inlet of the valve body. A cavity is formed between the first pipe and the second pipe. A piston for sealing the through hole of the second pipe is provided in the cavity. A first guide post inserted into the through hole of the second pipe is connected to one side of the piston. A sealing plate for sealing the through hole of the first pipe is connected to the other side of the piston. A second guide post inserted into the through hole of the first pipe is connected to the side wall of the sealing plate. A spring is wrapped around the second guide post. The two ends of the spring are fixedly connected to the side wall of the piston and the outer wall of the through hole of the first pipe, respectively. A gap is left between the outer wall of the piston and the side wall of the cavity to facilitate gas flow. A through hole communicating with the cavity is opened on the outer wall of the second pipe.

[0014] Furthermore, the valve cover is fixedly connected to the mounting port of the valve body by a clamping ring.

[0015] Compared with the prior art, the beneficial effects of the present invention are: When the gas pipeline safety self-closing valve is not ventilated, the hard sealing body, the first sealing ring and the valve seat form a soft and hard seal and are in the closed state. When ventilating, the ball valve is first opened by rotating the handle to ventilate, and then the reset cap is manually lifted, and the valve will remain in the open state.

[0016] When there is an air leak, the air pressure is too low. When the air pressure is less than the attraction between the magnet and the disk, the magnet will move the pull rod and the hard seal downward under its own weight to complete the closing action.

[0017] When the air pressure is too high, the diaphragm moves the lever upward. Under the action of the disk, the magnet moves the hard seal upward. During the upward movement, the baffle blocks the hard seal from moving upward, causing the disk and magnet to separate. Under the action of gravity, the hard seal moves downward and forms a seal with the valve seat. At the same time, when the intake pressure is too high, the gas cannot flow out from the gap in time, pushing the piston to move towards the first pipe. The sealing plate blocks the through hole of the first pipe, completing the closure and preventing accidents. It has good safety. Attached Figure Description

[0018] Fig. 1 This is a schematic diagram of the structure of the present invention;

[0019] Fig. 2 This is an enlarged structural diagram of part A of the present invention.

[0020] In the diagram: 1. Reset cap; 2. Pull ring; 3. Pull rod; 4. Hex nut; 5. Diaphragm pressure plate; 6. Diaphragm; 7. Disk; 8. Valve cover; 9. Pressure ring; 10. Magnet; 11. Magnet gasket; 12. Baffle; 13. Screw; 14. Hard seal; 15. First sealing ring; 16. Valve body; 17. Second sealing ring; 18. Ball; 19. Valve stem; 20. Handle; 21. First pipe; 22. Second pipe; 23. Piston; 24. First guide post; 25. Second guide post; 26. Spring; 27. Sealing plate; 28. Valve cap; 29. ​​Filter screen; 30. Snap ring. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figs. 1-2 The present invention provides a technical solution:

[0023] A pipeline gas safety self-closing valve includes a valve body 16, a valve seat disposed within the valve body 16, and a gas chamber within the valve body 16. The valve body 16 has an inlet, an outlet, and a mounting port communicating with the gas chamber. A valve cover 8 is mounted at the mounting port of the valve body 16 via a screw cap. The valve cover 8 is fixedly connected to the mounting port of the valve body 16 by a clamping ring 9. A diaphragm 6 is disposed at the bottom of the valve cover 8, its position moving up and down with the gas pressure rising and falling within the gas chamber. The diaphragm 6 seals the mounting port. A mechanism is installed at the lower end of the diaphragm 6 to open or close the valve seat when the diaphragm 6 moves. The valve body 16 has a sealed structure and is equipped with a ball valve for the operator to operate to start and stop the gas supply. The ball valve is installed on a section of the valve body 16 near the air inlet. In case the self-closing valve fails, it is convenient to cut off the gas supply. A valve cap 28 is inserted at one end of the valve body 16 at the air inlet. A filter screen 29 is installed inside the valve cap 28 to filter impurities. Because the gas contains impurities and debris, it is easy to clog the flow device and cause it to malfunction over time. Adding a filter screen 29 can filter impurities and debris and extend the service life of the equipment. The filter screen 29 is fixedly installed inside the valve cap 28 by a snap ring 30.

[0024] The sealing structure includes a disk 7 connected to the lower end of the diaphragm 6. A magnet 10 is attracted to the lower end of the disk 7, and a screw 13 is inserted through the magnet 10. A sealing rod is threaded onto the screw 13. When the gas pressure is too high, the diaphragm 6 is pushed upward, and the sealing rod automatically moves downward to cut off the gas source. When the pressure is low, the sealing rod moves downward under gravity to automatically cut off the gas source. A hard seal body 14 is fixedly connected to the lower end of the sealing rod, and its lower end fits against the valve seat to form a sealing structure. The lower end face of the hard seal body 14 has a spherical crown-shaped structure, and the lateral length of the upper end of the hard seal body 14 is greater than the diameter of the sealing rod. The hard seal body 14 and the sealing rod are integrally formed, and the integral structure is stable. The material of the hard seal body 14 is an alloy of aluminum, iron, and copper. Made of a certain material, the sealing structure further includes a baffle 12 movably sleeved on the sealing rod for guiding the movement of the hard seal body 14. The edge of the baffle 12 rests on the upper end face of the mounting port of the valve body 16, and the baffle 12 is located below the diaphragm 6. The lower end of the magnet 10 is connected to a magnet gasket 11 sleeved on the hard seal body 14 for protecting the magnet 10. The sealing structure also includes a first sealing ring 15 sleeved on the outer surface of the thick section of the hard seal body 14 for forming a soft sealing structure with the valve seat. The hard seal body 14 and the first sealing ring 15 form a two-layer sealing form, with the hard seal body 14 being a hard seal and the first sealing ring 15 being a soft seal. The combination of hard and soft seals makes the sealing effect better, can withstand high temperature, and is fireproof. In case of gas leakage and fire, it can prolong the rescue time.

[0025] In addition, a diaphragm pressure plate 5 is connected to the upper middle part of the diaphragm 6, and a pull rod 3 is connected to the upper end of the diaphragm 6. The end of the pull rod 3 away from the diaphragm 6 passes through the diaphragm pressure plate 5 and the valve cover 8 in sequence to reach the outside of the valve cover 8. A pull ring 2 with its lower end installed on the upper surface of the valve cover 8 is movably sleeved on the pull rod 3. A reset cap 1 inserted into the pull ring 2 is connected to the upper end of the pull rod 3. A hexagonal nut 4 that is pressed against the upper surface of the diaphragm pressure plate 5 is threaded onto the end of the pull rod 3 located below the valve cover 8.

[0026] The ball valve includes a ball 18. On both sides of the ball 18, there are second sealing rings 17 that are respectively embedded in the valve body 16 and the valve cap 28 to form a sealing surface with the ball 18. The upper end of the ball 18 is connected to a valve stem 19. The end of the valve stem 19 away from the ball 18 passes through the valve body 16 and reaches the outside of the valve body 16. The end of the valve stem 19 located outside the valve body 16 is connected to a handle 20 for adjusting the opening and closing of the ball 18. The valve body 16 at the lower end of the handle 20 is clearly marked with a manual switch. A flow-cutting device is installed in the channel of the ball 18 to cut off the gas flow when it is too large or too small.

[0027] The flow control device includes a first pipe 21 fixedly connected inside the sphere 18 and having a through hole. A second pipe 22 with a through hole is sleeved on the side of the first pipe 21 near the air inlet of the valve body 16. A cavity is formed between the first pipe 21 and the second pipe 22. A piston 23 for sealing the through hole of the second pipe 22 is provided in the cavity. A first guide post 24 inserted into the through hole of the second pipe 22 is connected to one side of the piston 23. A sealing plate 27 for sealing the through hole of the first pipe 21 is connected to the other side of the piston 23. A second guide post 25 inserted into the through hole of the first pipe 21 is connected to the side wall of the sealing plate 27. A spring 26 is surrounded by the second guide post 25. The two ends of the spring 26 are fixedly connected to the side wall of the piston 23 and the outer wall of the through hole of the first pipe 21, respectively. A gap is left between the outer wall of the piston 23 and the side wall of the cavity to facilitate gas flow. A through hole communicating with the cavity is opened on the outer wall of the second pipe 22.

[0028] This pipeline gas safety self-closing valve, when not in operation, forms a soft and hard seal with the hard seal body 14, the first sealing ring 15, and the valve seat, remaining in a closed state. It is heat-resistant and fireproof, and in case of gas leakage and fire, it can extend rescue time. To allow gas to flow, first open the ball valve by rotating the handle 20, then manually lift the reset cap 1; the valve will then remain open.

[0029] When there is an air leak, the air pressure is too low. When the air pressure is less than the attraction between the magnet 10 and the disk 7, the magnet 10 will drive the pull rod 3 and the hard seal 14 to move downward under its own weight, thus completing the closing action.

[0030] When the air pressure is too high, the diaphragm 6 drives the pull rod 3 to move upward. Under the action of the disk 7, the magnet 10 carries the hard seal 14 upward. During the upward movement, the baffle 12 will block the hard seal 14 from moving upward, causing the disk 7 to separate from the magnet 10. Under the action of gravity, the hard seal 14 moves downward and forms a seal with the valve seat. At the same time, when the intake pressure is too high, the gas cannot flow out from the gap in time, pushing the piston 23 to move towards the first pipe 21. The sealing plate 27 blocks the through hole of the first pipe 21, completing the closure and preventing accidents. It has good safety.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pipeline gas safety self-closing valve, comprising a valve body (16), a valve seat disposed within the valve body (16), a gas chamber disposed within the valve body (16), and an inlet, an outlet, and an installation port communicating with the gas chamber on the valve body (16), characterized in that: A valve cover (8) is provided at the mounting port of the valve body (16) by a screw cover. The bottom of the valve cover (8) is provided with a diaphragm (6) that moves up and down with the rise and fall of the gas pressure in the gas chamber. The diaphragm (6) seals the mounting port. A sealing structure is installed at the lower end of the diaphragm (6) to open or close the valve seat when the diaphragm (6) rises and falls. A ball valve for the operator to operate to open and close the gas is also installed on the valve body (16). The ball valve is installed on a section of the valve body (16) near the air inlet. A valve cap (28) is inserted at one end of the valve body (16) at the air inlet. A filter screen (29) for filtering impurities is provided inside the valve cap (28). The filter screen (29) is fixedly installed inside the valve cap (28) by a snap ring (30). The upper middle part of the diaphragm (6) is connected to a diaphragm pressure plate (5), and the upper end of the diaphragm (6) is connected to a pull rod (3). The end of the pull rod (3) away from the diaphragm (6) passes through the diaphragm pressure plate (5) and the valve cover (8) in sequence to reach the outside of the valve cover (8). A pull ring (2) with its lower end installed on the upper surface of the valve cover (8) is movably sleeved on the pull rod (3). A reset cap (1) inserted into the pull ring (2) is connected to the upper end of the pull rod (3). A hexagonal nut (4) that presses against the upper surface of the diaphragm pressure plate (5) is threaded onto the end of the pull rod (3) located below the valve cover (8). The ball valve includes a ball (18), and two second sealing rings (17) are respectively embedded in the valve body (16) and the valve cap (28) to form a sealing surface with the ball (18). The upper end of the ball (18) is connected to a valve stem (19). The end of the valve stem (19) away from the ball (18) passes through the valve body (16) and reaches the outside of the valve body (16). The end of the valve stem (19) outside the valve body (16) is connected to a handle (20) for adjusting the opening and closing of the ball (18). A flow-cutting device is installed in the channel of the ball (18) to cut off the gas flow when it is too large or too small. The flow control device includes a first pipe (21) fixedly connected inside the ball (18) and having a through hole. A second pipe (22) with a through hole is sleeved on the side of the first pipe (21) near the air inlet of the valve body (16). A cavity is formed between the first pipe (21) and the second pipe (22). A piston (23) for sealing the through hole of the second pipe (22) is provided in the cavity. A first guide post (24) inserted into the through hole of the second pipe (22) is connected to one side of the piston (23), and the other side of the piston (23) is connected to... A sealing plate (27) is provided for sealing the through hole of the first pipe (21). The side wall of the sealing plate (27) is connected to a second guide post (25) inserted into the through hole of the first pipe (21). The second guide post (25) is surrounded by a spring (26). The two ends of the spring (26) are fixedly connected to the side wall of the piston (23) and the outer wall of the through hole of the first pipe (21), respectively. A gap is left between the outer wall of the piston (23) and the side wall of the cavity to facilitate gas flow. The outer wall of the second pipe (22) is provided with a through hole communicating with the cavity.

2. The pipeline gas safety self-closing valve according to claim 1, characterized in that: The sealing structure includes a disk (7) connected to the lower end of the diaphragm (6), a magnet (10) is attracted to the lower end of the disk (7), a screw (13) is inserted through the magnet (10), a sealing rod is threaded on the screw (13), and a hard sealing body (14) is fixedly connected to the lower end of the sealing rod and its lower end fits against the valve seat to form a sealing structure.

3. The pipeline gas safety self-closing valve according to claim 2, characterized in that: The sealing structure also includes a baffle (12) movably sleeved on the sealing rod for guiding the movement of the hard seal body (14). The edge of the baffle (12) rests on the upper end face of the valve body (16) mounting port, and the baffle (12) is located below the diaphragm (6). The lower end of the magnet (10) is connected to a magnet gasket (11) sleeved on the hard seal body (14) for protecting the magnet (10).

4. A pipeline gas safety self-closing valve according to claim 3, characterized in that: The lower end face of the hard seal (14) has a spherical crown structure, and the lateral length of the upper end of the hard seal (14) is greater than the diameter of the sealing rod. The hard seal (14) and the sealing rod are integrally formed structures.

5. A pipeline gas safety self-closing valve according to claim 4, characterized in that: The sealing structure also includes a first sealing ring (15) fitted on the outer surface of the hard seal body (14) for forming a soft sealing structure with the valve seat.

6. A pipeline gas safety self-closing valve according to any one of claims 2-5, characterized in that: The hard seal (14) is made of one of the following materials: aluminum, iron, or copper alloy.

7. A pipeline gas safety self-closing valve according to claim 1, characterized in that: The valve cover (8) is fixedly connected to the mounting port of the valve body (16) by a clamping ring (9).

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