Gas safety shut-off valve

Abstract

The present application relates to gas valve technical field, propose a kind of gas safety cut-off valve, valve body has accommodating cavity and with the gas inlet channel and gas outlet channel of accommodating cavity communication;Cut-off valve core assembly is arranged in accommodating cavity;Valve plug is moved in gas inlet channel by connecting rod group, sealing shoulder is arranged in gas inlet channel, valve plug and sealing shoulder abut to divide gas inlet channel and accommodating cavity into two independent chambers;Gas inlet bypass channel and auxiliary reset channel selectively communicate according to the pressure of gas inlet channel, auxiliary reset channel has first outlet and second outlet, first outlet is communicated with accommodating cavity;Valve body is provided with reset cavity, second outlet is communicated with reset cavity, top rod is slidably arranged in reset cavity and top rod passes through reset cavity and abuts with connecting rod group, reset spring is located between top rod and the inner wall of reset cavity.Solve the problem that the gas safety cut-off valve in the prior art is caused by underpressure self-closing due to underpayment, and cannot restore gas supply autonomously after payment.

Description

Technical Field

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

[0002] Gas is an important energy source for modern homes, convenient and clean, but its use also poses certain safety hazards. Gas safety shut-off valves are generally used to achieve automatic shut-off and prevent major accidents. Gas leaks are mainly caused by the following: aging, cracking, or rodent damage to gas hoses; loose or accidentally detached hose clamps; stoves accidentally extinguishing due to wind or spilled soup; users forgetting to turn off the stove; high pressure entering the house due to pressure regulation failure; damage to equipment (gas meter, hose); gas outages for maintenance, replacement, gas shortages, ice blockage, or third-party sabotage; unpaid gas bills can also cause the shut-off valve to close. As is well known, gas leaks can cause great harm to people and property, and in severe cases, even endanger lives. Therefore, preventing gas leaks is the goal of improving pipeline gas shut-off valves and an effective way to avoid accidents.

[0003] Existing gas shut-off valves can automatically close and cut off the gas supply when overpressure, overcurrent, or underpressure occurs at the valve's inlet. Overcurrent or overpressure may be caused by the aforementioned faults, putting the gas supply in a dangerous state. A professional technician must resolve the fault, and then the gas shut-off valve must be manually reset to ensure safety. However, when underpressure occurs at the valve's inlet due to unpaid bills, the valve will also close. Even after the user pays the bill and the inlet pressure returns to normal, the user still needs to manually pull the valve to reset it. In practice, users may forget to pull the valve to reset it, or older users may not know how to operate the valve, resulting in the gas supply not being restored even after payment and pressure restoration. This significantly impacts the user experience. Therefore, a new gas shut-off valve is urgently needed to solve these problems. Summary of the Invention

[0004] This invention proposes a gas safety shut-off valve, which solves the problem in the prior art that the gas safety shut-off valve automatically closes due to underpressure caused by unpaid bills, and cannot automatically restore gas supply after payment.

[0005] The technical solution of the present invention is as follows:

[0006] A gas safety shut-off valve, the shut-off valve comprising:

[0007] The valve body has a receiving cavity and an air inlet channel and an air outlet channel communicating with the receiving cavity;

[0008] A shut-off valve core assembly is disposed within the receiving cavity;

[0009] The shut-off valve core assembly includes:

[0010] A valve plug and a connecting rod assembly, wherein the valve plug is movably disposed within the air intake channel by means of the connecting rod assembly, and a sealing shoulder is provided within the air intake channel, wherein the valve plug abuts against the sealing shoulder to divide the air intake channel and the receiving cavity into two independent chambers;

[0011] The shut-off valve also includes:

[0012] Reset conduction component, the reset conduction component comprising:

[0013] An intake bypass channel and an auxiliary reset channel are provided, wherein the intake bypass channel and the auxiliary reset channel are selectively connected according to the pressure of the intake channel, and the auxiliary reset channel has a first outlet and a second outlet, wherein the first outlet is connected to the accommodating cavity.

[0014] The valve body is provided with a reset cavity, the second outlet is connected to the reset cavity, the push rod is slidably disposed in the reset cavity and passes through the reset cavity to abut against the connecting rod assembly, and the reset spring is located between the push rod and the inner wall of the reset cavity.

[0015] The reset and conduction component further includes:

[0016] The variable position valve housing has a variable position cavity, one end of the variable position valve housing is connected to the intake bypass channel, and the other end is connected to the auxiliary reset channel;

[0017] A displacement block is slidably disposed within the displacement cavity. The displacement block is provided with a connecting channel. The inlet end of the connecting channel is connected to the intake bypass channel, and the outlet end of the connecting channel is located in the middle of the displacement block.

[0018] An elastic element is disposed between the inner wall of the displacement valve housing and the displacement block, and the outlet end of the connecting channel can selectively communicate with the auxiliary reset channel under the action of the elastic element.

[0019] The shut-off valve core assembly also includes:

[0020] A valve diaphragm is disposed within the receiving cavity. The valve diaphragm can be displaced according to the pressure within the receiving cavity, thereby moving the connecting rod assembly.

[0021] A horizontal plate is provided inside the cavity;

[0022] The linkage assembly includes:

[0023] A vertical rod passes through the horizontal plate and is movable in the vertical direction; one end of the vertical rod is connected to the valve diaphragm.

[0024] The first connecting rod has one end hinged to the valve body and the other end hinged to the bottom of the vertical rod;

[0025] The second connecting rod and the valve stem are connected as follows: one end of the second connecting rod is hinged to the bottom of the vertical rod, and the other end is hinged to one end of the valve stem, and the other end of the valve stem is connected to the valve plug.

[0026] The top of the vertical rod is magnetically connected to the valve diaphragm.

[0027] The shut-off valve also includes:

[0028] A differential pressure sensing component is disposed in the intake channel and located on the side of the valve plug near the intake channel inlet;

[0029] The micro differential pressure sensing component includes:

[0030] A differential pressure housing is threadedly connected to the air intake channel. A differential pressure chamber is provided inside the differential pressure housing. One end of the differential pressure housing is the air intake end, and the other end is the air outlet end.

[0031] A differential pressure plate is slidably disposed within the differential pressure chamber, and the differential pressure plate can abut against the outlet end of the differential pressure shell to achieve a seal.

[0032] The shut-off valve also includes:

[0033] A pull rod passes through the outer shell of the valve body and is connected to the valve diaphragm. The other end of the pull rod is a lifting end, and the pull rod is movably mounted on the valve body.

[0034] Both the air inlet channel and the air outlet channel are provided with threads inside.

[0035] The working principle and beneficial effects of this invention are as follows:

[0036] This invention discloses a gas safety shut-off valve. Specifically, during operation, due to underpressure on the inlet channel side of the valve body, the shut-off valve core assembly in the accommodating cavity of the valve body will automatically close. That is, the connecting rod assembly set in the accommodating cavity will drive the valve plug to move in the inlet channel until the valve plug is pressed against the sealing shoulder located in the inlet channel, the shut-off valve closes, and no more gas will pass through the outlet channel of the valve body. When the fault is cleared or the pressure on the inlet channel side is restored, the inlet bypass channel connected to the inlet channel will be connected to the auxiliary reset channel. It should be noted that when there is underpressure or overpressure, the inlet bypass channel and the auxiliary reset channel are closed. The normal pressure of the auxiliary reset channel is connected to the accommodating cavity through the first outlet, restoring the internal pressure to normal. At this time, the pressure on both sides of the valve plug is the same. The second outlet of the auxiliary reset channel is connected to the reset cavity on the valve body, applying pressure to the push rod. At the same time, with the elastic force of the reset spring, the push rod applies force to the connecting rod assembly, thereby moving the connecting rod assembly and driving the valve plug to reset, opening the inlet channel. The above technical solution can solve the problem in the existing gas safety shut-off valve that automatically closes due to underpressure caused by unpaid bills and cannot automatically restore gas supply after payment. Thus, the valve closed due to underpressure can automatically restore gas supply after the pressure is restored, which can provide great convenience to users. Attached Figure Description

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0038] Figure 1 This is a schematic diagram of the normal operating structure of the present invention;

[0039] Figure 2 This is a schematic diagram of the undervoltage self-closing structure of the present invention;

[0040] In the diagram: 1. Valve body, 2. Receiving cavity, 3. Inlet passage, 4. Outlet passage, 5. Valve plug, 6. Sealing shoulder, 7. Inlet bypass passage, 8. Reset passage, 9. First outlet, 10. Second outlet, 11. Push rod, 12. Reset spring, 13. Reset chamber, 14. Displacement valve housing, 15. Displacement chamber, 16. Displacement block, 17. Connecting passage, 18. Elastic element, 19. Valve diaphragm, 20. Horizontal plate, 21. Vertical rod, 22. First connecting rod, 23. Second connecting rod, 24. Valve stem, 25. Differential pressure housing, 26. Differential pressure chamber, 27. Differential pressure plate, 28. Pull rod. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0042] like Figures 1-2 As shown, this embodiment proposes a gas safety shut-off valve, the shut-off valve comprising:

[0043] Valve body 1, the valve body 1 having a receiving cavity 2 and an air inlet channel 3 and an air outlet channel 4 communicating with the receiving cavity 2;

[0044] A shut-off valve core assembly is disposed within the receiving cavity 2;

[0045] The shut-off valve core assembly includes:

[0046] The valve plug 5 and the connecting rod assembly are provided. The valve plug 5 is movably disposed in the air intake channel 3 by means of the connecting rod assembly. The air intake channel 3 is provided with a sealing shoulder 6. The valve plug 5 abuts against the sealing shoulder 6 to divide the air intake channel 3 and the receiving cavity 2 into two independent chambers.

[0047] The shut-off valve also includes:

[0048] Reset conduction component, the reset conduction component comprising:

[0049] The intake bypass channel 7 and the auxiliary reset channel 8 are selectively connected according to the pressure of the intake channel 3. The auxiliary reset channel 8 has a first outlet 9 and a second outlet 10. The first outlet 9 is connected to the accommodating cavity 2.

[0050] The valve body 1 is provided with a reset chamber 13, the second outlet 10 is connected to the reset chamber 13, the push rod 11 is slidably disposed in the reset chamber 13 and the push rod 11 passes through the reset chamber 13 and abuts against the connecting rod assembly, and the reset spring 12 is located between the push rod 11 and the inner wall of the reset chamber 13.

[0051] This embodiment discloses a gas safety shut-off valve. Specifically, during operation, due to underpressure on the inlet channel 3 side of the valve body 1, the shut-off valve core assembly in the receiving cavity 2 of the valve body 1 will automatically close. That is, the linkage assembly set in the receiving cavity 2 will drive the valve plug 5 to move within the inlet channel 3 until the valve plug 5 is pressed against the sealing shoulder 6 located within the inlet channel 3, the shut-off valve closes, and gas will no longer pass through the outlet channel 4 of the valve body 1. When the fault is cleared or the pressure on the inlet channel 3 side is restored, the inlet bypass channel 7 connected to the inlet channel 3 will connect with the auxiliary recovery channel. When the pressure channel 8 is open, it should be noted that when there is underpressure or overpressure, the intake bypass channel 7 and the auxiliary reset channel 8 are closed. The normal pressure of the auxiliary reset channel 8 is connected to the accommodating cavity 2 through the first outlet 9, restoring its internal pressure to normal. At this time, the pressure on both sides of the valve plug 5 is the same. The second outlet 10 of the auxiliary reset channel 8 is connected to the reset cavity 13 on the valve body 1, applying pressure to the push rod 11. Simultaneously, with the elastic force of the reset spring 12, the push rod 11 applies force to the connecting rod assembly, thereby moving the connecting rod assembly and driving the valve plug 5 to reset, opening the intake channel 3. Through the above technical solution, the problem of gas safety shut-off valves in the prior art that automatically close due to underpressure caused by unpaid bills and cannot automatically restore gas supply after payment can be solved. Thus, the valve closed due to underpressure can automatically resume gas supply after the pressure supply is restored, providing great convenience to users.

[0052] The reset and conduction component further includes:

[0053] The variable valve housing 14 has a variable cavity 15. One end of the variable valve housing 14 is connected to the intake bypass channel 7, and the other end is connected to the auxiliary reset channel 8.

[0054] The displacement block 16 is slidably disposed in the displacement cavity 15. The displacement block 16 is provided with a connecting channel 17. The inlet end of the connecting channel 17 is connected to the intake bypass channel 7, and the outlet end of the connecting channel 17 is located in the middle of the displacement block 16.

[0055] The elastic element 18 is disposed between the inner wall of the displacement valve housing 14 and the displacement block 16, and the outlet end of the connecting channel 17 can selectively communicate with the auxiliary reset channel 8 under the action of the elastic element 18.

[0056] In this embodiment, the connection between the intake bypass channel 7 and the auxiliary reset channel 8 is achieved through a displacement connecting component, which enables selective connection. The displacement valve housing 14 has a displacement chamber 15, and the displacement block 16 is movably disposed within the displacement chamber 15. The connecting channel within the displacement block 16 can only connect the intake bypass channel 7 and the auxiliary reset channel 8 when the displacement block 16 moves to a designated position. The displacement block 16 is displaced under the action of the air pressure in the intake bypass channel 7. On the other side of the displacement block 16, an elastic element 18 is installed. The elastic force of the elastic element 18 is calibrated. When the air pressure in the intake bypass channel 7 is normal, it is exactly balanced with the elastic force of the elastic element 18, thus connecting the intake bypass channel 7 and the auxiliary reset channel 8. If the intake bypass channel 7 is under-pressured or over-pressured, both the intake bypass channel 7 and the auxiliary reset channel 8 are closed.

[0057] The shut-off valve core assembly also includes:

[0058] A valve diaphragm 19 is disposed within the receiving cavity 2. The valve diaphragm 19 can be displaced according to the pressure within the receiving cavity 2, thereby driving the connecting rod assembly to move.

[0059] In this embodiment, a valve diaphragm 19 is also installed in the cavity 2. The valve diaphragm 19 is connected to the side wall of the cavity 2, and the valve diaphragm 19 is sealed at the connection. The overall shape of the valve diaphragm 19 is designed to deform along the pressure direction when the internal pressure is negative or high. In this embodiment, it adopts a structure with an annular concave surface. The valve diaphragm 19 is connected to the connecting rod assembly. When the internal pressure changes, the valve diaphragm 19 changes displacement, pulling the connecting rod assembly to move in position, thereby achieving the function of controlling the valve plug 5 to close.

[0060] A horizontal plate 20 is provided inside the cavity 2;

[0061] The linkage assembly includes:

[0062] A vertical rod 21 passes through the horizontal plate 20 and can move in the vertical direction; one end of the vertical rod 21 is connected to the valve diaphragm 19.

[0063] The first connecting rod 22 has one end hinged to the valve body 1 and the other end hinged to the bottom of the vertical rod 21.

[0064] The second connecting rod 23 and the valve stem 24 are connected as follows: one end of the second connecting rod 23 is hinged to the bottom of the vertical rod 21, and the other end is hinged to one end of the valve stem 24. The other end of the valve stem 24 is connected to the valve plug 5.

[0065] In this embodiment, the linkage group that can move the valve plug 5 and is driven by the valve diaphragm 19 is a structure composed of multiple linkages. Specifically, a horizontal plate 20 is first installed in the cavity 2. The horizontal plate 20 has a hole in the center. The hole on the template provides guidance for the vertical movement of the vertical rod 21. One end of the vertical rod 21 is connected to the valve diaphragm 19, and the other end is a hinge point, which is divided into two hinge points, respectively hinged to the first linkage 22 and the second linkage 23. At the same time, the hinge point of the first linkage 22 on the vertical rod 21 can undergo short-distance displacement or slight deformation to adapt to position changes. The other end of the second linkage 23 is connected to the valve stem 24. Driven by the vertical movement of the vertical rod 21, the second linkage 23 drives the valve stem 24 to move, and the valve stem 24 drives the valve plug 5 to move, thereby forming self-closing and opening.

[0066] The top of the vertical rod 21 is magnetically connected to the valve diaphragm 19.

[0067] In this embodiment, the top of the vertical rod 21 is magnetically connected to the valve diaphragm 19. When the pressure in the air intake channel 3 of the shut-off valve is too high, the valve diaphragm 19 moves upward, and the valve diaphragm 19 and the vertical rod 21 are disconnected under pressure. The high pressure pushes the valve plug 5 to close, and the valve diaphragm 19 moves upward, thereby forming overpressure protection.

[0068] The shut-off valve also includes:

[0069] A differential pressure sensing component is disposed in the air intake channel 3 and located on the side of the valve plug 5 near the inlet of the air intake channel 3;

[0070] The micro differential pressure sensing component includes:

[0071] Differential pressure housing 25 is threadedly connected to the air intake channel 3. Differential pressure housing 25 has a differential pressure chamber 26 inside. One end of differential pressure housing 25 is the air intake end and the other end is the air outlet end.

[0072] Differential pressure plate 27 is slidably disposed in the differential pressure chamber 26, and the differential pressure plate 27 can abut against the air outlet end of the differential pressure shell 25 to achieve sealing.

[0073] In this embodiment, a micro differential pressure sensing component is also provided inside the shut-off valve. It is located inside the air intake channel 3, on one side of the valve plug 5, just close to the inlet side of the air intake channel 3. The micro differential pressure sensing component is connected to a differential pressure housing 25 by threads in the air intake channel. A sliding differential pressure plate 27 is installed in the differential pressure chamber 26 inside the differential pressure housing 25. Under normal gas flow conditions, the differential pressure plate 27 inside the differential pressure housing 25 is in a floating position, but it will not block the gas outlet of the differential pressure housing 25. When the gas flow suddenly increases, the differential pressure plate 27 will move towards the gas outlet of the differential pressure housing 25, thereby blocking the gas outlet. At this time, the gas in the cavity 2 is consumed, the pressure decreases, the valve diaphragm 19 contracts, thereby closing the valve plug 5, which plays the role of overflow protection.

[0074] The shut-off valve also includes:

[0075] A pull rod 28 passes through the outer shell of the valve body 1 and is connected to the valve diaphragm 19. The other end of the pull rod 28 is a lifting end, and the pull rod 28 is movably mounted on the valve body 1.

[0076] In this embodiment, a pull rod 28 is also installed on the shut-off valve. One end of the pull rod 28 extends out of the outer shell of the valve body 1, and the other end is connected to the valve diaphragm 19 inside, so that the user can control the position of the valve diaphragm 19 by pulling the pull rod 28, and thus control the opening and closing of the valve plug 5.

[0077] Both the air inlet channel 3 and the air outlet channel 4 are provided with threads inside.

[0078] In this embodiment, both the air intake channel 3 and the air outlet channel 4 are provided with threads inside to facilitate connection.

[0079] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gas safety shut-off valve characterised in that, The shut-off valve includes: The valve body (1) has a receiving cavity (2) and an air inlet channel (3) and an air outlet channel (4) communicating with the receiving cavity (2). A shut-off valve core assembly is disposed within the receiving cavity (2); The shut-off valve core assembly includes: A valve plug (5) and a connecting rod assembly, wherein the valve plug (5) is movably disposed in the air intake channel (3) by means of the connecting rod assembly, and a sealing shoulder (6) is provided in the air intake channel (3), wherein the valve plug (5) abuts against the sealing shoulder (6) to divide the air intake channel (3) and the receiving cavity (2) into two independent chambers; The shut-off valve also includes: Reset conduction component, the reset conduction component comprising: The intake bypass channel (7) and the auxiliary reset channel (8) are selectively connected according to the pressure of the intake channel (3). The auxiliary reset channel (8) has a first outlet (9) and a second outlet (10). The first outlet (9) is connected to the accommodating cavity (2). When the intake channel (3) is under-pressured, the shut-off valve core assembly automatically closes, and the intake bypass channel (7) and the auxiliary reset channel (8) are in a closed state. The valve body (1) is provided with a reset cavity (13), the second outlet (10) is connected to the reset cavity (13), the push rod (11) is slidably disposed in the reset cavity (13) and the push rod (11) passes through the reset cavity (13) and abuts against the connecting rod assembly, and the reset spring (12) is located between the push rod (11) and the inner wall of the reset cavity (13); When the fault is cleared or the pressure is restored on the side of the intake channel (3), the intake bypass channel (7) connected to the intake channel (3) will be connected to the auxiliary reset channel (8); The pressure on both sides of the valve plug (5) is the same. The second outlet (10) of the auxiliary reset channel (8) is connected to the reset chamber (13) on the valve body (1), which applies pressure to the push rod (11). At the same time, in conjunction with the elastic force of the reset spring (12), the push rod (11) applies force to the connecting rod assembly, thereby causing the connecting rod assembly to move and drive the valve plug (5) to reset.

2. Gas safety shut-off valve according to claim 1, characterized in that The reset and conduction component further includes: The variable valve housing (14) has a variable cavity (15), one end of the variable valve housing (14) is connected to the intake bypass channel (7), and the other end is connected to the auxiliary reset channel (8); Displacement block (16), the displacement block (16) is slidably disposed in the displacement cavity (15), the displacement block (16) is provided with a connecting channel (17), the inlet end of the connecting channel (17) is connected to the intake bypass channel (7), and the outlet end of the connecting channel (17) is located in the middle of the displacement block (16). The elastic element (18) is disposed between the inner wall of the displacement valve housing (14) and the displacement block (16). The outlet end of the connecting channel (17) can be selectively connected to the auxiliary reset channel (8) under the action of the elastic element (18).

3. The gas safety shut-off valve of claim 1, wherein The shut-off valve core assembly also includes: A valve diaphragm (19) is disposed in the receiving cavity (2). The valve diaphragm (19) can be displaced according to the pressure in the receiving cavity (2) and drive the connecting rod assembly to move.

4. A gas safety shut-off valve according to claim 3, characterised in that A horizontal plate (20) is provided inside the cavity (2); The linkage assembly includes: A vertical rod (21) passes through the horizontal plate (20) and can move in the vertical direction. One end of the vertical rod (21) is connected to the valve diaphragm (19). The first connecting rod (22) has one end hinged to the valve body (1) and the other end hinged to the bottom of the vertical rod (21); The second connecting rod (23) and the valve stem (24) are connected as follows: one end of the second connecting rod (23) is hinged to the bottom of the vertical rod (21), and the other end is hinged to one end of the valve stem (24). The other end of the valve stem (24) is connected to the valve plug (5).

5. A gas safety shut-off valve according to claim 4, characterised in that The top of the vertical rod (21) is magnetically connected to the valve diaphragm (19).

6. A gas safety shut-off valve according to claim 5, characterised in that The shut-off valve also includes: A differential pressure sensing component is disposed in the intake channel (3) and located on the side of the valve plug (5) near the inlet of the intake channel (3); The micro differential pressure sensing component includes: Differential pressure housing (25) is threadedly connected to the air intake channel (3). Differential pressure housing (25) has a differential pressure chamber (26) inside. One end of differential pressure housing (25) is the air intake end and the other end is the air outlet end. Differential pressure plate (27) is slidably disposed in the differential pressure chamber (26), and the differential pressure plate (27) can abut against the air outlet end of the differential pressure shell (25) to achieve sealing.

7. The gas safety shut-off valve of claim 5, wherein The shut-off valve also includes: A pull rod (28) passes through the outer shell of the valve body (1) and is connected to the valve diaphragm (19). The other end of the pull rod (28) is a lifting end. The pull rod (28) is movably mounted on the valve body (1).

8. The gas safety shut-off valve of claim 1, wherein, Both the air inlet channel (3) and the air outlet channel (4) are provided with threads inside.

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