Fuel gas cut-off valve

Abstract

The invention relates to the technical field of valves, and particularly discloses a gas cut-off valve which comprises a valve body with an inlet end and an outlet end, a valve element is arranged in the valve body in a penetrating mode, and the valve element is used for controlling on-off of the valve body; a bottom cover is installed at the bottom of the valve body, an upper cover is installed at the top of the valve body, a cut-off controller is installed on the upper cover, and the valve element penetrates through the upper cover and is in transmission fit with the cut-off controller. The outlet end of the valve body is communicated with a bypass pipe, and the tail end of the bypass pipe is communicated with the cut-off controller; when the fluid pressure at the outlet end of the valve body exceeds a set threshold value, the cut-off controller relieves limiting of the valve element, and the valve element moves and cuts off communication of the valve body. According to the fuel gas stop valve, a pure mechanical structure is adopted, when fuel gas pressure is abnormal, blocking of a fuel gas channel can be rapidly completed, and the defects that when an existing fuel gas stop valve adopts a mechanical-electromagnetic composite control structure, reliability is low, and manufacturing cost is high are overcome.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more particularly to a gas shut-off valve. Background Technology

[0002] Gas shut-off valves are used in gas transmission and distribution systems to monitor gas pressure. When the system pressure exceeds a set value, they can shut off the gas supply in an emergency to ensure system safety. They do not require external power and can complete the automatic shut-off action using the pressure signal of the pipeline itself.

[0003] Existing gas shut-off valves generally adopt a mechanical-electromagnetic composite control structure. During normal operation, the gas passage is opened by manually pulling the valve stem to maintain the unobstructed state of the gas passage. When the system detects an abnormality in the gas, the electromagnetic device is energized instantaneously to generate a strong magnetic attraction force, which releases the mechanical constraint of the moving iron on the valve stem, allowing the valve stem to quickly complete the gas passage blocking under the action of the return spring.

[0004] However, this technical solution has significant limitations: First, the electromagnetic actuator has poor environmental adaptability. Excessive humidity can easily cause rust and jamming of iron components, while high temperature may affect the performance stability of magnetic materials, resulting in reduced reliability of tripping in emergency situations. Second, the system is configured with a dual magnetic circuit structure of permanent magnets and electromagnetic coils, which not only increases the cost of raw materials, but also complicates the production process due to the precision assembly requirements of electromagnetic components, indirectly increasing the overall manufacturing cost. Summary of the Invention

[0005] The purpose of this invention is to provide a gas shut-off valve to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides a gas shut-off valve, comprising a valve body having an inlet end and an outlet end, wherein a valve core is disposed inside the valve body, the valve core being used to control the on / off state of the valve body; a bottom cover is installed at the bottom of the valve body, and a top cover is installed at the top of the valve body, a shut-off controller being installed on the top cover, the valve core passing through the top cover and engaging with the shut-off controller; a bypass pipe is connected to the outlet end of the valve body, the end of the bypass pipe being connected to the shut-off controller; when the fluid pressure at the outlet end of the valve body exceeds a set threshold, the shut-off controller releases the limit on the valve core, the valve core displaces, and shuts off the connection of the valve body.

[0007] Preferably, the valve core includes a valve stem that slides through the upper cover; a valve head is installed at one end of the valve stem inside the valve body, and a spring is sleeved on the valve stem, with the two ends of the spring abutting against the valve head and the upper cover respectively; the end of the valve stem located outside the valve body is in transmission cooperation with the cut-off controller.

[0008] Preferably, the valve head includes a small valve port mounted on the valve stem, a valve seat mounted on the small valve port, and a valve pad mounted on the side of the valve seat away from the valve stem; a guide seat is provided on the side of the valve pad away from the valve seat, and the guide seat is mounted on the valve seat by bolts; a valve port is installed inside the valve body, the guide seat is slidably mounted on the inside of the valve port, and the valve pad is correspondingly arranged with the valve port.

[0009] Preferably, a spring seat is provided on the side of the valve seat near the valve stem, the spring seat is sleeved on the valve stem, and the bottom end of the first spring abuts against the spring seat.

[0010] Preferably, the top of the upper cover has a stepped hole, and the valve stem passes through the stepped hole; a copper sleeve and a clamping bolt are arranged sequentially from bottom to top in the stepped hole, and both the copper sleeve and the clamping bolt are slidably sleeved on the valve stem; an annular washer is provided between the clamping bolt and the hole wall of the stepped hole, and the annular washer is fixed to the clamping bolt by a locking nut.

[0011] Preferably, the cut-off controller includes a housing mounted on the upper cover; a sensor and a pressure regulating mechanism are mounted on the top side wall of the housing, the sensor and the pressure regulating mechanism being in a driving cooperation; a locking mechanism is provided inside the housing, the locking mechanism being in a driving cooperation with the pressure regulating mechanism; a handle shaft is rotatably connected to the side wall of the housing, a locking plate is detachably mounted on one end of the handle shaft inside the housing, the locking plate being in a limiting cooperation with the locking mechanism; a sprocket is fixedly sleeved on the handle shaft, one end of a chain is fixedly connected to the sprocket, and the other end of the sprocket is fixedly connected to the valve core; a reset handle is mounted on the end of the handle shaft outside the housing.

[0012] Preferably, a pressure plate is provided on the side of the locking plate away from the handle shaft, the pressure plate is installed on the handle shaft by bolts, and the locking plate is detachably connected to the handle shaft by bolts and the pressure plate.

[0013] Preferably, the sensor includes a sensor housing mounted on the housing, a connecting rod slidably passing through the sensor housing, a tray fixedly mounted on one end of the connecting rod inside the sensor housing, a diaphragm fixedly connected to the tray, the edge of the diaphragm fixedly connected to the sensor housing, and the other end of the connecting rod extending into the housing and engaging with the pressure regulating mechanism; a three-way connector is connected to the side of the sensor housing away from the housing, and a one-way valve and a pressure relief valve are respectively installed on the other two ports of the three-way connector, the one-way valve being connected to the bypass pipe.

[0014] Preferably, the pressure regulating mechanism includes a pressure regulating outer shell fixedly mounted on the housing, a push rod slidably passing through the pressure regulating outer shell, a slider one fixedly connected to one end of the push rod inside the pressure regulating outer shell, the slider one being slidably connected to the pressure regulating outer shell; the other end of the push rod extends into the housing and is fixedly connected to the connecting rod, the locking mechanism being in transmission cooperation with the push rod; a slider two is threaded on the end of the pressure regulating outer shell away from the push rod, a spring two is provided between the slider two and the slider one, the two ends of the spring two abutting against the slider one and the slider two respectively.

[0015] Preferably, the locking mechanism includes a lock body installed inside the housing, the lock plate being in a limiting fit with the lock body, and the lock body being in a driving fit with the push rod; a manual shaft is fixedly connected to the lock body, a manual torque is installed on the manual shaft, a cover plate is detachably connected to the side of the housing away from the handle shaft, the manual torque passes through the cover plate and is rotatably connected to the cover plate, and the manual torque is used to drive the lock body to reset.

[0016] Compared with the prior art, the present invention has the following advantages and technical effects:

[0017] The gas shut-off valve provided by this invention adopts a purely mechanical structure, which can quickly block the gas passage when the gas pressure is abnormal, avoiding the defects of low reliability and high manufacturing cost of existing gas shut-off valves that adopt mechanical-electromagnetic composite control structure. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the gas shut-off valve of the present invention;

[0020] Figure 2 This is a top cross-sectional view of the cut-off controller of the present invention;

[0021] Figure 3 This is a diagram showing the state when the locking plate and the lock body of the present invention are locked together;

[0022] In the diagram: 1. Valve stem; 2. Clamping bolt; 3. Copper sleeve; 4. Top cover; 5. Spring 1; 6. Spring seat; 7. Small valve port; 8. Valve gasket seat; 9. Valve gasket; 10. Valve port; 11. Guide seat; 12. Valve body; 13. Bottom cover; 14. Locking nut; 15. Housing; 16. Handle shaft; 17. Locking plate; 18. Sprocket; 19. Chain; 20. Reset handle; 21. Pressure plate; 22. Sensor housing; 23. Connecting rod; 24. Tray; 25. Diaphragm; 26. T-connector; 27. Pressure relief valve; 28. Pressure regulating housing; 29. ​​Push rod; 30. Slider 1; 31. Slider 2; 32. Spring 2; 33. Lock body; 34. Manual shaft; 35. Manual torque; 36. Cover plate. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. The described embodiments are merely some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] like Figures 1 to 3 As shown, the present invention provides a gas shut-off valve, including a valve body 12 having an inlet end and an outlet end, a valve core passing through the valve body 12, the valve core being used to control the opening and closing of the valve body 12; a bottom cover 13 is installed at the bottom of the valve body 12, and an upper cover 4 is installed at the top of the valve body 12, a shut-off controller is installed on the upper cover 4, and the valve core passes through the upper cover 4 and is in a transmission cooperation with the shut-off controller; a bypass pipe is connected to the outlet end of the valve body 12, and the end of the bypass pipe is connected to the shut-off controller; when the fluid pressure at the outlet end of the valve body 12 exceeds a set threshold, the shut-off controller releases the limit on the valve core, the valve core is displaced and the connection of the valve body 12 is cut off.

[0025] When the pressure at the outlet of the valve body 12 increases, the fluid at the outlet enters the shut-off controller through the bypass pipe. Under the pressure of the fluid, the shut-off controller releases the limit on the valve core, causing the valve core to shift and cut off the connection of the valve body 12. When the air supply is restored, the fluid in the shut-off controller is first discharged to reset the shut-off controller. Then, the position of the valve core is manually adjusted, and the shut-off controller is used to re-limit the position of the valve core, thereby maintaining the connection of the valve body 12.

[0026] To further optimize the scheme, in order to ensure that the valve core can automatically cut off the connection of the valve body 12 after the valve core is released from the limit with the cut-off controller, the valve core includes a valve stem 1, which slides through the upper cover 4; a valve head is installed at one end of the valve stem 1 inside the valve body 12, and a spring 5 is sleeved on the valve stem 1, with the two ends of the spring 5 abutting against the valve head and the upper cover 4 respectively; the end of the valve stem 1 located outside the valve body 12 is in transmission cooperation with the cut-off controller.

[0027] To further optimize the design and ensure the sealing between the valve core and the valve body 12, the valve head includes a small valve port 7 mounted on the valve stem 1, a valve seat 8 mounted on the small valve port 7, and a valve gasket 9 mounted on the side of the valve seat 8 away from the valve stem 1; a guide seat 11 is provided on the side of the valve gasket 9 away from the valve seat 8, and the guide seat 11 is mounted on the valve seat 8 by bolts; a valve port 10 is installed inside the valve body 12, the guide seat 11 is slidably mounted on the inner side of the valve port 10, and the valve gasket 9 is correspondingly set with the valve port 10.

[0028] In a further optimized design, a spring seat 6 is provided on the side of the valve seat 8 near the valve stem 1. The spring seat 6 is fitted onto the valve stem 1, and the bottom end of the spring 5 abuts against the spring seat 6.

[0029] To further optimize the design and ensure the sealing between the valve stem 1 and the upper cover 4, a stepped hole is provided at the top of the upper cover 4, through which the valve stem 1 passes. A copper sleeve 3 and a clamping bolt 2 are arranged sequentially from bottom to top in the stepped hole, and both the copper sleeve 3 and the clamping bolt 2 are slidably fitted on the valve stem 1. An annular washer is provided between the clamping bolt 2 and the hole wall of the stepped hole, and the annular washer is fixed to the clamping bolt 2 by a locking nut 14.

[0030] To further optimize the design, sealing rings are installed between the bottom cover 13 and the valve body 12, between the top cover 4 and the valve body 12, between the copper sleeve 3 and the top cover 4, and between the valve port 10 and the valve body 12, so as to ensure the overall sealing effect of the valve body 12.

[0031] To further optimize the design and facilitate repeated limiting and release between the valve core and the shut-off controller, the shut-off controller includes a housing 15, which is mounted on the upper cover 4. A sensor and a pressure regulating mechanism are installed on the top side wall of the housing 15, with the sensor and pressure regulating mechanism engaging in a transmission relationship. A locking mechanism is provided inside the housing 15, which engages in a transmission relationship with the pressure regulating mechanism. A handle shaft 16 is rotatably connected to the side wall of the housing 15. A locking plate 17 is detachably installed at one end of the handle shaft 16 inside the housing 15, and the locking plate 17 engages in a limiting relationship with the locking mechanism. A sprocket 18 is fixedly sleeved on the handle shaft 16, with one end of a chain 19 fixedly connected to the sprocket 18, and the other end of the sprocket 18 fixedly connected to the valve core. A reset handle 20 is installed at the end of the handle shaft 16 outside the housing 15.

[0032] To further optimize the design, a pressure plate 21 is provided on the side of the locking plate 17 away from the handle shaft 16 for easy installation. The pressure plate 21 is installed on the handle shaft 16 by bolts, and the locking plate 17 is detachably connected to the handle shaft 16 by bolts and pressure plate 21.

[0033] To further optimize the design and ensure that the sensor can quickly block the gas passage even without any electromagnetic control structure, the sensor includes a sensor housing 22 mounted on the housing 15. A connecting rod 23 is slidably inserted through the sensor housing 22. A tray 24 is fixedly installed at one end of the connecting rod 23 inside the sensor housing 22. A diaphragm 25 is fixedly connected to the tray 24. The edge of the diaphragm 25 is fixedly connected to the sensor housing 22. The other end of the connecting rod 23 extends into the housing 15 and is driven by the pressure regulating mechanism. A three-way connector 26 is connected to the side of the sensor housing 22 away from the housing 15. The other two ports of the three-way connector 26 are respectively equipped with a one-way valve and a pressure relief valve 27. The one-way valve is connected to a bypass pipe.

[0034] To further optimize the design and facilitate the adjustment of the controller's response to the fluid pressure at the outlet of valve body 12, the pressure regulating mechanism includes a pressure regulating housing 28 fixedly mounted on housing 15. A push rod 29 is slidably mounted on the pressure regulating housing 28. One end of the push rod 29 located inside the pressure regulating housing 28 is fixedly connected to a slider 30, which is slidably connected to the pressure regulating housing 28. The other end of the push rod 29 extends into the housing 15 and is fixedly connected to a connecting rod 23. A locking mechanism is engaged with the push rod 29. A second slider 31 is threaded onto the end of the pressure regulating housing 28 away from the push rod 29. A second spring 32 is provided between the second slider 31 and the first slider 30, with both ends of the second spring 32 abutting against the first slider 30 and the second slider 31, respectively.

[0035] To further optimize the design, in order to facilitate the restoration of the limiting effect between the locking plate 17 and the locking mechanism, the locking mechanism includes a lock body 33 installed inside the housing 15. The locking plate 17 and the lock body 33 are in a limiting fit, and the lock body 33 is in a transmission fit with the push rod 29. A manual shaft 34 is fixedly connected to the lock body 33, and a manual torque 35 is installed on the manual shaft 34. A cover plate 36 is detachably connected to the side of the housing 15 away from the handle shaft 16. The manual torque 35 passes through the cover plate 36 and is rotatably connected to the cover plate 36. The manual torque 35 is used to drive the lock body 33 to reset.

[0036] The working principle of the gas shut-off valve provided by this invention is as follows: When the pressure at the outlet end of the valve body 12 increases, the fluid at the outlet end enters the sensor housing 22 through the bypass pipe. Through the setting of the diaphragm 25, the pressure on the side of the diaphragm 25 near the bypass pipe increases. Under the action of pressure, the tray 24 and the connecting rod 23 are pushed to move into the housing 15. At this time, the push rod 29 connected to the connecting rod 23 also moves, thereby compressing the spring 32 inside the pressure regulating housing 28. At the same time, the push rod 29 will drive the lock body 33 to move. After the lock body 33 moves, the locking plate 17 and the lock body 33 make contact with the limiting effect. Under the action of the spring 5, the valve core moves downward, and the sprocket 18 also rotates. The chain 19 wrapped around the sprocket 18 is unwound. The valve pad 9 and the valve port 10 are in close contact under the action of the spring 5, thereby closing the valve body 12 and cutting off the connection of the valve body 12.

[0037] When it is necessary to restore the connection of valve body 12, open the vent valve, spring 2 32 resets, and under the action of spring 2 32, push rod 29 and tray 24 reset. After closing the vent valve, manually rotate lock body 33 and lock plate 17 by manually turning 35 and resetting handle 20, so that lock plate 17 re-limits lock body 33. When lock plate 17 rotates, sprocket 18 winds chain 19, and under the action of chain 19, valve stem 1 and valve pad 9 are pulled upward, compressing spring 1 5, and valve port 10 is restored to the connected state.

[0038] The gas shut-off valve provided by this invention adopts a purely mechanical structure, which can quickly block the gas passage when the gas pressure is abnormal, avoiding the defects of low reliability and high manufacturing cost of existing gas shut-off valves that adopt mechanical-electromagnetic composite control structure.

[0039] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A gas shut-off valve, characterized in that, The valve includes a valve body (12) with an inlet and an outlet. A valve core is installed inside the valve body (12) and is used to control the opening and closing of the valve body (12). A bottom cover (13) is installed at the bottom of the valve body (12), and an upper cover (4) is installed at the top of the valve body (12). A cut-off controller is installed on the upper cover (4), and the valve core passes through the upper cover (4) and is driven by the cut-off controller. A bypass pipe is connected to the outlet of the valve body (12), and the end of the bypass pipe is connected to the cut-off controller. When the fluid pressure at the outlet of the valve body (12) exceeds a set threshold, the cut-off controller releases the limit on the valve core, the valve core is displaced, and the valve body (12) is disconnected.

2. The gas shut-off valve according to claim 1, characterized in that, The valve core includes a valve stem (1), which slides through the upper cover (4); a valve head is installed at one end of the valve stem (1) inside the valve body (12), and a spring (5) is sleeved on the valve stem (1), with the two ends of the spring (5) abutting against the valve head and the upper cover (4) respectively; the end of the valve stem (1) outside the valve body (12) is in transmission cooperation with the cut-off controller.

3. The gas shut-off valve according to claim 2, characterized in that, The valve head includes a small valve port (7) mounted on the valve stem (1), a valve seat (8) mounted on the small valve port (7), and a valve pad (9) mounted on the side of the valve seat (8) away from the valve stem (1); a guide seat (11) is provided on the side of the valve pad (9) away from the valve seat (8), and the guide seat (11) is mounted on the valve seat (8) by bolts; a valve port (10) is installed inside the valve body (12), the guide seat (11) is slidably mounted on the inside of the valve port (10), and the valve pad (9) is correspondingly arranged with the valve port (10).

4. The gas shut-off valve according to claim 3, characterized in that, A spring seat (6) is provided on the side of the valve seat (8) near the valve stem (1). The spring seat (6) is sleeved on the valve stem (1), and the bottom end of the spring (5) abuts against the spring seat (6).

5. The gas shut-off valve according to claim 2, characterized in that, The top of the cover (4) has a stepped hole, and the valve stem (1) passes through the stepped hole. A copper sleeve (3) and a clamping bolt (2) are arranged sequentially from bottom to top in the stepped hole. The copper sleeve (3) and the clamping bolt (2) are slidably sleeved on the valve stem (1). An annular washer is provided between the clamping bolt (2) and the hole wall of the stepped hole. The annular washer is fixed on the clamping bolt (2) by a locking nut (14).

6. The gas shut-off valve according to claim 1, characterized in that, The cut-off controller includes a housing (15), which is mounted on the upper cover (4); a sensor and a pressure regulating mechanism are installed on the top side wall of the housing (15), and the sensor is driven by the pressure regulating mechanism; a locking mechanism is provided inside the housing (15), and the locking mechanism is driven by the pressure regulating mechanism; a handle shaft (16) is rotatably connected to the side wall of the housing (15), and a locking plate (17) is detachably installed on one end of the handle shaft (16) inside the housing (15), and the locking plate (17) is limited by the locking mechanism; a sprocket (18) is fixedly sleeved on the handle shaft (16), and one end of a chain (19) is fixedly connected to the sprocket (18), and the other end of the sprocket (18) is fixedly connected to the valve core; a reset handle (20) is installed on one end of the handle shaft (16) outside the housing (15).

7. The gas shut-off valve according to claim 6, characterized in that, A pressure plate (21) is provided on the side of the locking plate (17) away from the handle shaft (16). The pressure plate (21) is installed on the handle shaft (16) by bolts. The locking plate (17) and the pressure plate (21) are detachably connected to the handle shaft (16) by bolts.

8. The gas shut-off valve according to claim 6, characterized in that, The sensor includes a sensor housing (22) mounted on the housing (15). A connecting rod (23) is slidably passed through the sensor housing (22). A tray (24) is fixedly installed at one end of the connecting rod (23) inside the sensor housing (22). A diaphragm (25) is fixedly connected to the tray (24). The edge of the diaphragm (25) is fixedly connected to the sensor housing (22). The other end of the connecting rod (23) extends into the housing (15) and is driven and cooperated with the pressure regulating mechanism. A three-way connector (26) is connected to the side of the sensor housing (22) away from the housing (15). A one-way valve and a pressure relief valve (27) are respectively installed on the other two ports of the three-way connector (26). The one-way valve is connected to the bypass pipe.

9. The gas shut-off valve according to claim 8, characterized in that, The pressure regulating mechanism includes a pressure regulating shell (28) fixedly installed on the housing (15). A push rod (29) is slidably passed through the pressure regulating shell (28). A slider (30) is fixedly connected to one end of the push rod (29) inside the pressure regulating shell (28). The slider (30) is slidably connected to the pressure regulating shell (28). The other end of the push rod (29) extends into the housing (15) and is fixedly connected to the connecting rod (23). The locking mechanism is driven by the push rod (29). A slider (31) is threaded on one end of the pressure regulating shell (28) away from the push rod (29). A spring (32) is provided between the slider (31) and the slider (30). The two ends of the spring (32) abut against the slider (30) and the slider (31) respectively.

10. The gas shut-off valve according to claim 9, characterized in that, The locking mechanism includes a lock body (33) installed inside the housing (15), a lock plate (17) being limited to the lock body (33), and the lock body (33) being driven to the push rod (29); a manual shaft (34) is fixedly connected to the lock body (33), a manual torque (35) is installed on the manual shaft (34), a cover plate (36) is detachably connected to the side of the housing (15) away from the handle shaft (16), the manual torque (35) passes through the cover plate (36) and is rotatably connected to the cover plate (36), and the manual torque (35) is used to drive the lock body (33) to reset.

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