Control device for gas safety cut-off system

Abstract

The invention belongs to the technical field of fuel gas conveying pipe network corollary equipment, and particularly relates to a control device for a fuel gas safety cut-off system, which comprises a piston cylinder fixedly mounted on a rack, and a piston body dividing the piston cylinder into a first chamber and a second chamber is arranged in the piston cylinder; the first chamber is communicated with the outlet end of the stop valve, and the second chamber is communicated with the inlet end of the stop valve; the limiting piece comprises a lifting seat, a locking head and a blocking head; the lifting seat is in transmission connection with the piston body; the locking head is installed on the lifting base in a sliding mode in the central axis direction of the piston cylinder, and a first elastic piece and a first stroke limiting piece are installed between the locking head and the lifting base. The clamping mechanism is arranged between the locking head and the handle; the blocking head is fixedly arranged on the lifting base, and a containing groove for containing the handle is formed between the locking head and the blocking head. The invention aims to solve the problem that the stop valve is damaged due to the fact that the stop valve is easy to be excessively wrenched when being reopened.

Description

Technical Field

[0001] This invention belongs to the technical field of gas transmission pipeline network supporting equipment, specifically relating to a control device for a gas safety shut-off system. Background Technology

[0002] Gas safety shut-off valves are used in gas transmission and distribution systems. When the pressure in the pipeline controlled by the shut-off valve is higher or lower than the set shut-off pressure, the safety shut-off valve can urgently cut off the gas flow in the pipeline to protect downstream equipment. A shut-off valve generally consists of a closing element (such as a valve disc), a driving element (such as a closing spring), a tripping mechanism, a control element (such as an adjusting spring or sensor diaphragm), and a manual reset element (such as a handle).

[0003] A shut-off valve is a safety device. The shut-off pressure is set by changing the compression of the regulating spring, so that the spring force is compared with the air pressure on the other side of the sensor diaphragm (transmitted from the pressure tapping point). If the pressure exceeds the expected set value, the shut-off valve will automatically shut off.

[0004] Chinese utility model patent (publication number: CN205226584U) discloses a gas safety shut-off valve with stable transmission of gas pressure detection and rapid tripping. The shut-off valve has stable performance, and the internal tripping mechanism can ensure that the shut-off valve is not affected by external impacts and will not be falsely shut off. It also provides a reliable guarantee for improving the accuracy of gas pressure detection of the shut-off valve.

[0005] However, in actual use, when reopening the shut-off valve, the handle should be slowly rotated 10 degrees in the opening direction to wait for the inlet and outlet pressures of the shut-off valve to reach equilibrium. At the same time, observe whether the pressure monitored by the shut-off valve is within the set range. Only when it is normal can the next operation be carried out.

[0006] One problem is that existing shut-off valves do not have a mechanism to limit the handle when it is turned. If the operator uses too much force, it may be over-turned, which could damage the shut-off valve. Summary of the Invention

[0007] The purpose of this invention is to provide a control device for a gas safety shut-off system to solve the problem that the shut-off valve is easily over-operated when it is reopened, which can cause damage to the shut-off valve.

[0008] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0009] A control device for a gas safety shut-off system, comprising:

[0010] A piston cylinder is fixedly installed on a frame, and the piston cylinder is provided with a piston body that divides the piston cylinder into a first chamber and a second chamber;

[0011] The first chamber is connected to the outlet end of the shut-off valve, and the second chamber is connected to the inlet end of the shut-off valve;

[0012] The limiting element includes a lifting seat, a locking head, and a blocking head;

[0013] The lifting seat is connected to the piston body in a transmission manner and is slidably mounted on the frame along the central axis of the piston cylinder;

[0014] The locking head is slidably mounted on the lifting seat along the central axis of the piston cylinder, and a first elastic element and a first stroke limiting element are installed between the locking head and the lifting seat;

[0015] The first elastic element is used to drive the locking head to move away from the lifting seat, and the first travel limit element is used to limit the maximum distance the locking head can move away from the lifting seat.

[0016] A locking mechanism installed between the locking head and the handle to limit the degree of freedom of the locking head to move toward the piston cylinder;

[0017] The blocking head is fixedly mounted on the lifting seat, and a receiving groove for accommodating the handle is formed between the locking head and the blocking head;

[0018] A reset mechanism that applies a force away from the handle to the lifting seat, wherein the force applied by the reset mechanism to the lifting seat is F0;

[0019] The force F1 is the force exerted by the medium in the first chamber on the piston body, causing the piston body to move away from the handle.

[0020] The force F2 is the force exerted by the medium in the second chamber on the piston body, causing the piston body to move closer to the handle.

[0021] When F0+F1<F2, the locking head and the blocking head can be located on the movement path of the handle;

[0022] When F0+F1>F2, the blocking head can disengage from the movement path of the handle.

[0023] Furthermore, a second elastic element and a second stroke limiting element are installed between the lifting seat and the piston body;

[0024] The second elastic element is used to drive the lifting seat to move away from the piston cylinder, and the second stroke limiting element is used to limit the maximum distance the lifting seat moves away from the piston cylinder.

[0025] The blocking head is fixedly mounted on the lifting base;

[0026] When the limiting member is subjected to external force, the locking head can disengage from the movement path of the handle.

[0027] This structural design connects the lifting seat and the piston body via a second elastic element and a second stroke limiting element. If an emergency occurs during the reopening of the shut-off valve and it needs to be closed immediately, the operator can rotate the handle counter-clockwise by a small angle to disengage the locking mechanism from the handle and the locking head. Then, the operator uses their other hand to apply a pushing force towards the piston cylinder through the blocking head, causing the lifting seat to overcome the prestress of the second elastic element and move closer to the piston cylinder. This allows the lifting seat to disengage the locking head from the handle's movement path. Finally, rotating the handle clockwise allows the valve core of the shut-off valve to reseat, resulting in higher safety.

[0028] A control device for a gas safety shut-off system, comprising:

[0029] A piston cylinder is fixedly installed on a frame, and the piston cylinder is provided with a piston body that divides the piston cylinder into a first chamber and a second chamber;

[0030] The first chamber is connected to the outlet end of the shut-off valve, and the second chamber is connected to the inlet end of the shut-off valve;

[0031] The limiting element includes a lifting seat, a locking head, and a blocking head;

[0032] The lifting seat is slidably connected to the piston body and is slidably mounted on the frame along the central axis of the piston cylinder;

[0033] A second elastic element and a second stroke limiting element are installed between the lifting seat and the piston body;

[0034] The second elastic element is used to drive the lifting seat to move away from the piston cylinder, and the second stroke limiting element is used to limit the maximum distance the lifting seat moves away from the piston cylinder.

[0035] When the limiting member is subjected to external force, the locking head can disengage from the movement path of the handle;

[0036] Both the locking head and the blocking head are fixedly mounted on the lifting base;

[0037] A receiving groove for accommodating the handle is formed between the locking head and the blocking head;

[0038] A locking mechanism installed between the locking head and the handle to limit the degree of freedom of the locking head to move toward the piston cylinder;

[0039] A reset mechanism that applies a force away from the handle to the lifting seat, wherein the force applied by the reset mechanism to the lifting seat is F0;

[0040] The force F1 is the force exerted by the medium in the first chamber on the piston body, causing the piston body to move away from the handle.

[0041] The force F2 is the force exerted by the medium in the second chamber on the piston body, causing the piston body to move closer to the handle.

[0042] When F0+F1<F2, the locking head and the blocking head can be located on the movement path of the handle;

[0043] When F0+F1>F2, the blocking head can disengage from the movement path of the handle.

[0044] Furthermore, the free end of the locking head is provided with a guide surface that is inclined toward the side away from the blocking head.

[0045] This structural design, through the setting of the guide surface, allows the handle to move more smoothly when it pushes the locking head from the outside of the limiting member to overcome the prestress of the first elastic element or drives the lifting seat through the locking head to overcome the prestress of the second elastic element and move towards the piston cylinder, thanks to the guidance of the guide surface.

[0046] Furthermore, the reset mechanism is a third elastic element.

[0047] This structural design, using a third elastic element as a reset mechanism, applies a force to the lifting seat away from the handle, resulting in a simple structure and reduced requirements for the installation environment.

[0048] Further specified, the piston body is provided with a piston rod extending through the piston cylinder on the side facing the first chamber;

[0049] A connecting rod is installed on the lifting platform;

[0050] The second elastic element is located within the groove and between the connecting rod and the piston body;

[0051] The second travel limiting component includes a limiting block and a limiting ring;

[0052] The limiting block is located between the limiting ring and the piston body;

[0053] The limiting block is fixedly installed on the connecting rod and slidably disposed in the slide groove;

[0054] The limiting ring is fixedly installed on the piston rod and sleeved on the connecting rod;

[0055] The outer diameter of the limiting block is larger than the inner diameter of the limiting ring.

[0056] This structural design achieves a sliding connection between the lifting seat and the piston body through the cooperation of the piston rod and the connecting rod, and uses a limiting block and a limiting ring to form a second stroke limiting component to limit the movement distance of the lifting seat. The structure is simple and highly practical.

[0057] Furthermore, the reset mechanism is a compression spring;

[0058] The compression spring is sleeved on the piston rod and located in the first chamber.

[0059] This structural design uses a compression spring fitted on the piston rod and located in the first chamber as a reset mechanism to apply a force away from the handle to the lifting seat. It has a simple structure, is easy to install, and is highly practical.

[0060] Further specified, the piston body is provided with a support sleeve in the first chamber, and the side wall of the support sleeve is radially provided with a communicating groove;

[0061] The compression spring is located inside the support sleeve.

[0062] This structural design, through the setting of the support sleeve, limits the upper limit of the compression of the first chamber by the piston body, avoiding the problem of excessive compression of the compression spring in the first chamber, which would reduce the service life of the compression spring in the first chamber.

[0063] Furthermore, the lifting seat is movably connected to the free end of the connecting rod. This structural design, through the movable connection between the lifting seat and the free end of the connecting rod, provides a buffer for the force transmitted from the handle to the piston body via the limiting component during use, extending the service life of the piston body and piston cylinder, and is highly practical.

[0064] Further specifying, the locking mechanism includes a locking block;

[0065] The locking block is fixedly mounted on the side wall of the locking head near the blocking head;

[0066] When the handle is placed against the side wall of the locking head near the blocking head, away from the blocking head, the handle is located between the locking block and the lifting seat.

[0067] This structural design, which directly forms the locking mechanism through the locking blocks, is simple in structure, easy to manufacture, and highly practical.

[0068] The invention employing the above technical solution has the following advantages:

[0069] 1. By cooperating with the handle, piston cylinder, limiting component and reset mechanism, the maximum rotation position of the handle is limited when the outlet pressure of the shut-off valve is less than the inlet pressure of the shut-off valve, so as to avoid excessive operation of the handle and damage to the shut-off valve.

[0070] 2. At the same time, after the pressure between the outlet end and the inlet end of the shut-off valve is restored to equilibrium, the shut-off valve can be opened again after a simple operation.

[0071] 3. The lifting seat and piston body are connected via the second elastic element and the second stroke limit element. If an emergency occurs during the reopening of the shut-off valve and it needs to be closed immediately, the operator can rotate the handle counterclockwise by a small angle to disengage the locking mechanism from the handle and the locking head. Then, the other hand applies a pushing force towards the piston cylinder through the blocking head, causing the lifting seat to overcome the prestress of the second elastic element and move closer to the piston cylinder. This allows the lifting seat to drive the locking head away from the handle's movement path. At this point, rotating the handle clockwise will allow the valve core of the shut-off valve to reseat, resulting in higher safety. Attached Figure Description

[0072] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0073] Figure 1 This is a schematic diagram of the structure of the handle being engaged with the limiting member in an embodiment of the control device for a gas safety cut-off system according to the present invention;

[0074] Figure 2 This is a cross-sectional view of the handle being engaged with a limiting member in an embodiment of a control device for a gas safety shut-off system according to the present invention.

[0075] Figure 3 This is a schematic diagram of the structure of the control device for a gas safety shut-off system according to the present invention after the blocking head disengages from the handle. Figure 1 ;

[0076] Figure 4 This is a schematic diagram of the structure of the control device for a gas safety shut-off system according to the present invention after the blocking head disengages from the handle. Figure 2 ;

[0077] Figure 5 This is a schematic diagram of the locking head portion in an embodiment of a control device for a gas safety shut-off system according to the present invention;

[0078] The symbols for the main components are explained below:

[0079] Handle 1, Square Shaft 10, Slot 11

[0080] Piston cylinder 2, piston body 20, first chamber 21, first connecting pipe 210, second chamber 22, second connecting pipe 220.

[0081] Piston rod 23, connecting rod 24

[0082] Guide rail 3, frame 30,

[0083] Lifting base 4, locking head 41, locking block 410, blocking head 42

[0084] First elastic element 51, first stroke limiting element 510

[0085] Second elastic element 52, limiting block 520

[0086] Third elastic element 53, support sleeve 530

[0087] Support ring 540. Detailed Implementation

[0088] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that similar or identical parts are referred to by the same reference numerals in the drawings or description. Implementations not shown or described in the drawings are forms known to those skilled in the art. In addition, directional terms mentioned in the embodiments, such as "up," "down," "top," "bottom," "left," "right," "front," and "back," are only for reference to the directions in the drawings and are not intended to limit the scope of protection of the present invention.

[0089] Example 1:

[0090] like Figures 1-5 As shown, a control device for a gas safety shut-off system according to the present invention includes:

[0091] Handle 1 is detachably mounted on square shaft 10;

[0092] A piston cylinder 2 is fixedly installed on the frame 30. The piston cylinder 2 is provided with a piston body 20 that divides the piston cylinder 2 into a first chamber 21 and a second chamber 22.

[0093] The first chamber 21 is connected to the outlet end of the shut-off valve, and the second chamber 22 is connected to the inlet end of the shut-off valve.

[0094] In this embodiment, the piston cylinder 2 is preferably provided with a first connecting pipe 210 and a second connecting pipe 220.

[0095] The first chamber 21 is connected to the outlet end of the shut-off valve via the first connecting pipe 210;

[0096] The second chamber 22 is connected to the inlet end of the shut-off valve via the second connecting pipe 220;

[0097] In fact, the piston cylinder 2 can also be directly installed on the pipeline at the outlet end and the pipeline at the inlet end of the shut-off valve, and the original connecting pipeline of the shut-off valve can be directly connected to the first chamber 21 and the second chamber 22 of the piston cylinder 2.

[0098] The limiting components include the lifting seat 4, the locking head 41, and the blocking head 42;

[0099] The lifting seat 4 is connected to the piston body 20 through a transmission and is slidably mounted on the frame 30 along the central axis of the piston cylinder 2;

[0100] The locking head 41 is slidably mounted on the lifting seat 4 along the central axis of the piston cylinder 2. A first elastic element 51 and a first stroke limiting element 510 are installed between the locking head 41 and the lifting seat 4.

[0101] The first elastic element 51 is used to drive the locking head 41 to move away from the lifting seat 4, and the first stroke limit element 510 is used to limit the maximum distance that the locking head 41 moves away from the lifting seat 4.

[0102] The first elastic element 51 is preferably a compression spring, and the first stroke limiting element 510 is preferably a fixing bolt that passes through the lifting seat 4 from below, is screwed onto the locking head 41, and passes through the compression spring. In practice, the first elastic element 51 can also be configured as an elastic airbag, and the first stroke limiting element 510 can be configured as a structure that limits the expansion limit of the elastic airbag.

[0103] A locking mechanism is provided between the handle 1 and the locking head 41 to limit the degree of freedom of movement of the locking head 41 toward the piston cylinder 2;

[0104] The blocking head 42 is fixedly mounted on the lifting seat 4, and a receiving groove for accommodating the handle 1 is formed between the locking head 41 and the blocking head 42.

[0105] A reset mechanism that applies a force away from the handle 1 to the lifting seat 4, the force applied by the reset mechanism to the lifting seat 4 being F0;

[0106] The force F1 is the force exerted by the medium in the first chamber 21 on the piston body 20, causing the piston body 20 to move away from the handle 1.

[0107] The medium in the second chamber 22 acts on the piston body 20, and the force that drives the piston body 20 to move closer to the handle 1 is F2.

[0108] When F0+F1<F2, the locking head 41 and the blocking head 42 can be located on the movement path of the handle 1;

[0109] When F0+F1>F2, the blocking head 42 can disengage from the movement path of the handle 1.

[0110] In this embodiment, the control device is installed on the pipeline with the shut-off valve. When the pressure transmitted from the pressure tapping point to the sensor diaphragm side is within the shut-off setting value, the handle 1 is not installed on the square shaft 10.

[0111] When the pressure transmitted from the pressure tapping point to the sensor diaphragm side is abnormal, exceeding (overpressure) or falling below (underpressure) cutoff setting value, the tripping mechanism releases, and the valve core of the cutoff valve sits down under the action of the seat spring, thus closing the cutoff valve. This causes the pressure at the outlet end of the cutoff valve to be less than the pressure at the inlet end of the cutoff valve. During this process, the valve core drives the square shaft 10 of the tripping mechanism to rotate (this is mature prior art, so it will not be described in detail in this application).

[0112] The phenomenon that the pressure at the outlet end of the shut-off valve is less than the pressure at the inlet end of the shut-off valve is transmitted to the first chamber 21 and the second chamber 22 through the first connecting pipe 210 and the second connecting pipe 220 respectively, making F0+F1<F2. At this time, the limiting member moves upward under the push of the piston body 20 until the locking head 41 and the blocking head 42 are located on the movement path of the handle 1.

[0113] After the cause of the fault is resolved, when the shut-off valve needs to be reopened, install the handle 1 on the square shaft 10 and then rotate it in the opposite direction (counterclockwise) so that the handle 1 rotates from the locking head 41 side toward the direction of the limiting part until the handle 1 is against the locking head 41.

[0114] As the rotation continues, the handle 1 applies a pushing force towards the lifting seat 4 to the locking head 41 during the rotation process, overcoming the prestress of the first elastic element 51, causing the locking head 41 to move closer to the lifting seat 4, thereby clearing the movement path of the handle 1, until the handle 1 passes the locking head 41 and enters the receiving groove between the locking head 41 and the blocking head 42, and then abuts against the side wall of the blocking head 42, blocking the continued rotation of the handle 1. At this time, the locking head 41 is reset under the action of the first elastic element 51, and the first stroke limiting element 510 limits the maximum distance that the locking head 41 can move away from the lifting seat 4.

[0115] When handle 1 is released, the square shaft 10, under the action of the seat spring on the valve core of the shut-off valve, tends to rotate clockwise, thereby causing handle 1 to rotate clockwise until handle 1 is pressed against the side of the locking head 41 near the blocking head 42, and the locking mechanism completes the locking between handle 1 and locking head 41 (e.g., Figure 1 and Figure 2 (as shown)

[0116] Thus, the square shaft 10 is prevented from continuing to reset, so that the shut-off valve remains slightly open in a specific position until the pressure between the outlet end and the inlet end of the shut-off valve is restored to balance, so that F0+F1>F2.

[0117] During this process, even if the pressure in the first chamber 21 gradually increases, causing the piston body 20 to tend to move the limiting member away from the handle 1, the locking mechanism can restrain the limiting member by the handle 1 due to the locking between the handle 1 and the locking head 41.

[0118] Only after the operator confirms that the pressure between the outlet and inlet of the shut-off valve has returned to equilibrium, the operator rotates handle 1 counterclockwise a second time. This disengages the locking mechanism from the handle 1 and the locking head 41. The reset mechanism then drives the limiting member downwards via the piston body 20, allowing the blocking head 42 to disengage from the movement path of handle 1 and no longer obstruct the rotation of handle 1 (e.g., ...). Figure 3 (as shown)

[0119] Continue turning handle 1 until square shaft 10 drives the tripping mechanism to re-lock the valve core, then remove handle 1.

[0120] A second elastic element 52 and a second stroke limiting element are installed between the lifting seat 4 and the piston body 20;

[0121] The second elastic element 52 is used to drive the lifting seat 4 to move away from the piston cylinder 2, and the second stroke limit element is used to limit the maximum distance that the lifting seat 4 moves away from the piston cylinder 2.

[0122] The blocking head 42 is fixedly mounted on the lifting base 4;

[0123] When the limiting member is subjected to external force, the locking head 41 can disengage from the movement path of the handle 1.

[0124] In practice, depending on the actual situation, the lifting seat 4 can be directly fixedly connected to the piston body 20. In this embodiment, the lifting seat 4 and the piston body 20 are connected by transmission through the second elastic element 52 and the second stroke limiting element. If an emergency occurs during the reopening of the shut-off valve and it is necessary to immediately close the shut-off valve again, the operator can rotate the handle 1 counterclockwise by a small angle again, so that the locking mechanism disengages from the locking head 41. Then, the other hand applies a pushing force towards the piston cylinder 2 through the blocking head 42, so that the lifting seat 4 overcomes the prestress of the second elastic element 52 and moves towards the piston cylinder 2, thereby causing the lifting seat 4 to drive the locking head 41 to disengage from the movement path of the handle 1 (e.g., Figure 4 As shown in the figure, at this time, turning handle 1 clockwise will allow the valve core of the shut-off valve to reseat, making it safer to use.

[0125] Example 2:

[0126] like Figures 1-4 As shown, a control device for a gas safety shut-off system according to the present invention includes:

[0127] Handle 1 is detachably mounted on square shaft 10;

[0128] A piston cylinder 2 is fixedly installed on the frame 30. The piston cylinder 2 is provided with a piston body 20 that divides the piston cylinder 2 into a first chamber 21 and a second chamber 22.

[0129] The first chamber 21 is connected to the outlet end of the shut-off valve, and the second chamber 22 is connected to the inlet end of the shut-off valve.

[0130] In this embodiment, the piston cylinder 2 is preferably provided with a first connecting pipe 210 and a second connecting pipe 220.

[0131] The first chamber 21 is connected to the outlet end of the shut-off valve via the first connecting pipe 210;

[0132] The second chamber 22 is connected to the inlet end of the shut-off valve via the second connecting pipe 220;

[0133] In fact, the piston cylinder 2 can also be directly installed on the pipeline at the outlet end and the pipeline at the inlet end of the shut-off valve, and the original connecting pipeline of the shut-off valve can be directly connected to the first chamber 21 and the second chamber 22 of the piston cylinder 2.

[0134] The limiting components include the lifting seat 4, the locking head 41, and the blocking head 42;

[0135] The lifting seat 4 is slidably connected to the piston body 20 and is slidably mounted on the frame 30 along the central axis of the piston cylinder 2;

[0136] A second elastic element 52 and a second stroke limiting element are installed between the lifting seat 4 and the piston body 20;

[0137] The second elastic element 52 is used to drive the lifting seat 4 to move away from the piston cylinder 2, and the second stroke limit element is used to limit the maximum distance that the lifting seat 4 moves away from the piston cylinder 2.

[0138] When the limiting member is subjected to external force, the locking head 41 can disengage from the movement path of the handle 1;

[0139] Both the locking head 41 and the blocking head 42 are fixedly mounted on the lifting base 4;

[0140] A receiving groove for accommodating the handle 1 is formed between the locking head 41 and the blocking head 42;

[0141] A locking mechanism is provided between the handle 1 and the locking head 41 to limit the degree of freedom of movement of the locking head 41 toward the piston cylinder 2;

[0142] A reset mechanism that applies a force away from the handle 1 to the lifting seat 4, the force applied by the reset mechanism to the lifting seat 4 being F0;

[0143] The force F1 is the force exerted by the medium in the first chamber 21 on the piston body 20, causing the piston body 20 to move away from the handle 1.

[0144] The medium in the second chamber 22 acts on the piston body 20, and the force that drives the piston body 20 to move closer to the handle 1 is F2.

[0145] When F0+F1<F2, the locking head 41 and the blocking head 42 can be located on the movement path of the handle 1;

[0146] When F0+F1>F2, the blocking head 42 can disengage from the movement path of the handle 1.

[0147] In this embodiment, the control device is installed on the pipeline with the shut-off valve. When the pressure transmitted from the pressure tapping point to the sensor diaphragm side is within the shut-off setting value, the handle 1 is not installed on the square shaft 10.

[0148] When the pressure transmitted from the pressure tapping point to the sensor diaphragm side is abnormal, exceeding (overpressure) or falling below (underpressure) cutoff setting value, the tripping mechanism releases, and the valve core of the cutoff valve sits down under the action of the seat spring, thus closing the cutoff valve. This causes the pressure at the outlet end of the cutoff valve to be less than the pressure at the inlet end of the cutoff valve. During this process, the valve core drives the square shaft 10 of the tripping mechanism to rotate (this is mature prior art, so it will not be described in detail in this application).

[0149] The phenomenon that the pressure at the outlet end of the shut-off valve is less than the pressure at the inlet end of the shut-off valve is transmitted to the first chamber 21 and the second chamber 22 through the first connecting pipe 210 and the second connecting pipe 220 respectively, making F0+F1<F2. At this time, the limiting member moves upward under the push of the piston body 20 until the locking head 41 and the blocking head 42 are located on the movement path of the handle 1.

[0150] After the cause of the fault is resolved, when the shut-off valve needs to be reopened, install the handle 1 on the square shaft 10 and then rotate it in the opposite direction (counterclockwise) so that the handle 1 rotates from the locking head 41 side toward the direction of the limiting part until the handle 1 is against the locking head 41.

[0151] As the handle continues to rotate, the locking head 41 applies a thrust toward the piston cylinder 2 to the limiting member during the rotation of the handle 1, overcoming the prestress of the second elastic member 52, causing the limiting member to move toward the piston cylinder 2, thereby clearing the movement path of the handle 1, until the handle 1 passes the locking head 41 and enters the receiving groove between the locking head 41 and the blocking head 42. The limiting member is then reset under the action of the second elastic member 52, and the second stroke limiter restricts the maximum distance that the lifting seat 4 moves away from the piston cylinder 2, so that the blocking head 42 on the limiting member is located on the movement path of the handle 1, thus blocking the continued rotation of the handle 1.

[0152] When handle 1 is released, the square shaft 10 tends to rotate clockwise under the action of the seat spring on the valve core of the shut-off valve, which in turn drives handle 1 to rotate clockwise until handle 1 is against the side of the locking head 41 near the blocking head 42, and the locking mechanism completes the locking between handle 1 and locking head 41.

[0153] Thus, the square shaft 10 is prevented from continuing to reset, so that the shut-off valve remains slightly open in a specific position until the pressure between the outlet end and the inlet end of the shut-off valve is restored to balance, so that F0+F1>F2.

[0154] During this process, even if the pressure in the first chamber 21 gradually increases, causing the piston body 20 to tend to move the limiting member away from the handle 1, the locking mechanism can restrain the limiting member by the handle 1 due to the locking between the handle 1 and the locking head 41.

[0155] Only after the operator confirms that the pressure between the outlet and inlet of the shut-off valve has returned to equilibrium, the operator rotates handle 1 counterclockwise a second time. This disengages the locking mechanism from the handle 1 and the locking head 41. The reset mechanism then drives the limiting member downwards via the piston body 20, allowing the blocking head 42 to disengage from the movement path of handle 1 and no longer obstruct the rotation of handle 1 (e.g., ...). Figure 3 (as shown)

[0156] Continue turning handle 1 until square shaft 10 drives the tripping mechanism to re-lock the valve core, then remove handle 1.

[0157] If an emergency occurs during the reopening of the shut-off valve and it needs to be closed immediately, the operator can turn the handle 1 counterclockwise by a small angle again to disengage the locking mechanism from the handle 1 and the locking head 41. Then, the other hand applies a pushing force towards the piston cylinder 2 through the blocking head 42, causing the lifting seat 4 to overcome the prestress of the second elastic element 52 and move closer to the piston cylinder 2. This causes the lifting seat 4 to drive the locking head 41 to disengage from the movement path of the handle 1. At this point, turning the handle 1 clockwise will allow the valve core of the shut-off valve to reseat.

[0158] The free end of the locking head 41 is provided with a guide surface that is inclined toward the side away from the blocking head 42.

[0159] In fact, depending on the actual situation, the side of the handle 1 can be directly set as an arc surface. In this embodiment, by setting the guide surface, when the handle 1 pushes the locking head 41 from the outside of the limiting member to overcome the prestress of the first elastic member 51 or drives the lifting seat 4 through the locking head 41 to overcome the prestress of the second elastic member 52 and moves towards the piston cylinder 2, the guide surface guides the handle 1 to push more smoothly.

[0160] It also includes a guide rail 3 fixedly installed on the frame 30, the length direction of the guide rail 3 being parallel to the central axis direction of the piston cylinder 2;

[0161] The lifting seat 4 is slidably mounted on the guide rail 3.

[0162] In practice, depending on the actual situation, options such as fixing a guide rod on the frame 30 and passing the guide rod through the lifting seat 4 can be used to achieve the purpose of sliding the lifting seat 4 on the frame 30. In this embodiment, the lifting seat 4 is slidably installed on the frame 30 through the guide rail 3. The structure is simple, the stability is strong, and the service life is long.

[0163] The distance between the free end of the blocking head 42 and the lifting seat 4 is greater than the distance between the free end of the locking head 41 and the lifting seat 4.

[0164] In practice, depending on the actual situation, the free end of the blocking head 42 and the free end of the locking head 41 can be set to be flush, and the rotation speed of the handle 1 can be slowed down when the handle 1 is rotated. In this embodiment, by limiting the height of the blocking head 42 and the locking head 41, the problem that the handle 1 cannot smoothly enter the receiving groove after passing the locking head 41 is avoided because the reset speed of the limiting member is lower than the rotation speed of the handle 1. This embodiment is highly practical.

[0165] The reset mechanism is the third elastic element 53.

[0166] In practice, depending on the actual situation, when the piston cylinder 2 is in a vertical state and the lifting seat 4 is located above the piston cylinder, a weight can be added to the lifting seat 4 as a reset mechanism. The weight of the weight, or even the weight of the lifting seat 4 itself, will drive the piston body 20 to move away from the handle 1 after the pressure in the first chamber 21 and the second chamber 22 of the lifting seat 4 is balanced. This will then drive the blocking head 42 to disengage from the movement path of the handle 1. In this embodiment, the third elastic element 53 is used as a reset mechanism to apply a force away from the handle 1 to the lifting seat 4. The structure is simple and the requirements for the installation environment are reduced.

[0167] A piston rod 23 extending through the piston cylinder 2 is provided on the side of the piston body 20 facing the first chamber 21;

[0168] A connecting rod 24 is installed on the lifting seat 4;

[0169] The second elastic element 52 is located in the groove and between the connecting rod 24 and the piston body 20;

[0170] The second-stroke limiting component includes a limiting block 520 and a limiting ring;

[0171] The limiting block 520 is located between the limiting ring and the piston body 20;

[0172] The limiting block 520 is fixedly installed on the connecting rod 24 and slidably disposed in the slide groove;

[0173] The limiting ring is fixedly installed on the piston rod 23 and sleeved on the connecting rod 24;

[0174] The outer diameter of the limit block 520 is larger than the inner diameter of the limit ring.

[0175] In practice, depending on the actual situation, it is also possible to select, for example, to set a magnet on the piston body 20, to fit a ring body attracted by the magnet on the outside of the piston cylinder 2, and to set a connecting rod between the ring body and the lifting seat 4, and to install a second elastic element 52 and a second stroke limiting element. In this embodiment, the sliding connection between the lifting seat 4 and the piston body 20 is realized through the cooperation of the piston rod 23 and the connecting rod 24, and the second stroke limiting element is formed by the limiting block 520 and the limiting ring to complete the limitation of the movement distance of the lifting seat 4. The structure is simple and has strong practicality.

[0176] The reset mechanism is a compression spring;

[0177] The compression spring is sleeved on the piston rod 23 and located in the first chamber 21.

[0178] In practice, depending on the actual situation, a tension spring connecting the piston cylinder 2 and the piston body 20 can be selected as the reset mechanism, such as one installed in the second chamber 22. In this embodiment, a compression spring sleeved on the piston rod 23 and located in the first chamber 21 is used as the reset mechanism to apply a force away from the handle 1 to the lifting seat 4. The structure is simple, easy to install, and highly practical.

[0179] The piston body 20 is provided with a support sleeve 530 in the first chamber 21, and the side wall of the support sleeve 530 is radially provided with a communicating groove.

[0180] The compression spring is located inside the support sleeve 530.

[0181] By setting the support sleeve 530, the upper limit of compression of the first chamber 21 by the piston body 20 is limited, so as to avoid excessive compression of the compression spring in the first chamber 21, which would reduce the service life of the compression spring in the first chamber 21.

[0182] The piston body 20 is provided with a support ring 540 in the second chamber 22, and the side wall of the support ring 540 is also radially provided with a connecting groove.

[0183] The first connecting pipe 210 and the second connecting pipe 220 are both installed on the side wall of the piston cylinder 2.

[0184] In practice, depending on the actual situation, the first connecting pipe 210 and the second connecting pipe 220 can be directly installed at the end of the piston cylinder 2. In this embodiment, the support ring 540, together with the support sleeve 530, can respectively limit the compression upper limit of the piston body 20 on the second chamber 22 and the first chamber 21, thus avoiding the piston body 20 from sticking to the end of the piston cylinder 2 during use, which would cause the first chamber 21 and the second chamber 22 to disappear, thereby preventing the first connecting pipe 210 and the second connecting pipe 220 installed on the side wall of the piston cylinder 2 from re-supplying pressure to the first chamber 21 and the second chamber 22, making it more convenient to use.

[0185] The lifting seat 4 is movably connected to the free end of the connecting rod 24. A ball joint is preferably used to connect the lifting seat 4 and the connecting rod 24; a rubber block can also be used.

[0186] In practice, depending on the actual situation, the lifting seat 4 can be directly fixedly connected to the free end of the connecting rod 24. In this embodiment, the lifting seat 4 is movably connected to the free end of the connecting rod 24, which provides a buffer for the force transmitted from the handle 1 to the piston body 20 through the limiting component during use, thereby extending the service life of the piston body 20 and the piston cylinder 2. This makes it highly practical.

[0187] The card-setting mechanism includes card block 410;

[0188] The locking block 410 is fixedly installed on the side wall of the locking head 41 near the blocking head 42;

[0189] When the handle 1 is placed against the side wall of the locking head 41 near the blocking head 42 on the side away from the blocking head 42, the handle 1 is located between the locking block 410 and the lifting seat 4.

[0190] In practice, depending on the actual situation, the locking mechanism can also be formed by the positioning hole on the locking head 41 and the protrusion on the handle 1. The protrusion is inserted laterally into the positioning hole to restrict the locking head 41 from moving towards the piston cylinder 2. In this embodiment, the locking mechanism is directly formed by the locking block 410, which is simple in structure, easy to produce, and highly practical.

[0191] The handle 1 has a slot 11 on the side away from the piston cylinder 2 that matches the locking block 410. The slot 11 is connected to the side wall of the handle 1 away from the blocking head 42.

[0192] In practice, depending on the actual situation, the card slot 11 can be omitted, and the handle 1 can be directly restricted by the card block 410. In this embodiment, the card block 410 is accommodated by the card slot 11, which makes it more convenient to use.

[0193] The control device for a gas safety shut-off system provided by the present invention has been described in detail above. The specific embodiments are described only to help understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A control device for a gas safety shut-off system, characterized in that: include: A piston cylinder (2) is fixedly installed on the frame (30), and the piston cylinder (2) is provided with a piston body (20) that divides the piston cylinder (2) into a first chamber (21) and a second chamber (22). The first chamber (21) is connected to the outlet end of the shut-off valve, and the second chamber (22) is connected to the inlet end of the shut-off valve; The limiting components include a lifting seat (4), a locking head (41), and a blocking head (42). The lifting seat (4) is connected to the piston body (20) and is slidably mounted on the frame (30) along the central axis of the piston cylinder (2); The locking head (41) is slidably mounted on the lifting seat (4) along the central axis of the piston cylinder (2), and a first elastic element (51) and a first stroke limit element (510) are installed between the locking head (41) and the lifting seat (4). The first elastic element (51) is used to drive the locking head (41) to move away from the lifting seat (4), and the first travel limit element (510) is used to limit the maximum distance that the locking head (41) moves away from the lifting seat (4). A locking mechanism installed between the locking head (41) and the handle (1) to limit the degree of freedom of movement of the locking head (41) toward the piston cylinder (2); The blocking head (42) is fixedly mounted on the lifting seat (4), and a receiving groove for accommodating the handle (1) is formed between the locking head (41) and the blocking head (42); A reset mechanism that applies a force away from the handle (1) to the lifting seat (4), wherein the force applied by the reset mechanism to the lifting seat (4) is F0; The force F1 is the force exerted by the medium in the first chamber (21) on the piston body (20) and causing the piston body (20) to move away from the handle (1). The medium in the second chamber (22) acts on the piston body (20) and drives the piston body (20) to move closer to the handle (1) by a force F2; When F0+F1<F2, the locking head (41) and the blocking head (42) can be located on the movement path of the handle (1); When F0+F1>F2, the blocking head (42) can disengage from the movement path of the handle (1).

2. The control device for a gas safety shut-off system according to claim 1, characterized in that: A second elastic element (52) and a second stroke limiting element are installed between the lifting seat (4) and the piston body (20); The second elastic element (52) is used to drive the lifting seat (4) to move away from the piston cylinder (2), and the second stroke limiting element is used to limit the maximum distance that the lifting seat (4) moves away from the piston cylinder (2); The blocking head (42) is fixedly mounted on the lifting seat (4); When the limiting member is subjected to external force, the locking head (41) can disengage from the movement path of the handle (1).

3. A control device for a gas safety shut-off system, characterized in that: include: A piston cylinder (2) is fixedly installed on the frame (30), and the piston cylinder (2) is provided with a piston body (20) that divides the piston cylinder (2) into a first chamber (21) and a second chamber (22). The first chamber (21) is connected to the outlet end of the shut-off valve, and the second chamber (22) is connected to the inlet end of the shut-off valve; The limiting components include a lifting seat (4), a locking head (41), and a blocking head (42). The lifting seat (4) is slidably connected to the piston body (20) and is slidably mounted on the frame (30) along the central axis of the piston cylinder (2); A second elastic element (52) and a second stroke limiting element are installed between the lifting seat (4) and the piston body (20); The second elastic element (52) is used to drive the lifting seat (4) to move away from the piston cylinder (2), and the second stroke limiting element is used to limit the maximum distance that the lifting seat (4) moves away from the piston cylinder (2); When the limiting member is subjected to external force, the locking head (41) can disengage from the movement path of the handle (1); The locking head (41) and the blocking head (42) are both fixedly mounted on the lifting seat (4); A receiving groove for accommodating the handle (1) is formed between the locking head (41) and the blocking head (42); A locking mechanism installed between the locking head (41) and the handle (1) to limit the degree of freedom of movement of the locking head (41) toward the piston cylinder (2); A reset mechanism that applies a force away from the handle (1) to the lifting seat (4), wherein the force applied by the reset mechanism to the lifting seat (4) is F0; The force F1 is the force exerted by the medium in the first chamber (21) on the piston body (20) and causing the piston body (20) to move away from the handle (1). The medium in the second chamber (22) acts on the piston body (20) and drives the piston body (20) to move closer to the handle (1) by a force F2; When F0+F1<F2, the locking head (41) and the blocking head (42) can be located on the movement path of the handle (1); When F0+F1>F2, the blocking head (42) can disengage from the movement path of the handle (1).

4. The control device for a gas safety shut-off system according to any one of claims 1-3, characterized in that: The free end of the locking head (41) is provided with a guide surface that is inclined toward the side away from the blocking head (42).

5. A control device for a gas safety shut-off system according to any one of claims 1-3, characterized in that: The reset mechanism is a third elastic element (53).

6. A control device for a gas safety shut-off system according to claim 2 or 3, characterized in that: The piston body (20) has a piston rod (23) extending through the piston cylinder (2) on the side facing the first chamber (21). A connecting rod (24) is installed on the lifting seat (4); The second elastic element (52) is located in the groove and between the connecting rod (24) and the piston body (20); The second travel limiting component includes a limiting block (520) and a limiting ring; The limiting block (520) is located between the limiting ring and the piston body (20); The limiting block (520) is fixedly installed on the connecting rod (24) and slidably disposed in the groove; The limiting ring is fixedly installed on the piston rod (23) and sleeved on the connecting rod (24); The outer diameter of the limiting block (520) is larger than the inner diameter of the limiting ring.

7. A control device for a gas safety shut-off system according to claim 6, characterized in that: The reset mechanism is a compression spring; The compression spring is sleeved on the piston rod (23) and located in the first chamber (21).

8. A control device for a gas safety shut-off system according to claim 7, characterized in that: The piston body (20) is provided with a support sleeve (530) in the first chamber (21), and the side wall of the support sleeve (530) is radially provided with a connecting groove; The compression spring is located inside the support sleeve (530).

9. A control device for a gas safety shut-off system according to claim 6, characterized in that: The lifting seat (4) is movably connected to the free end of the connecting rod (24).

10. A control device for a gas safety shut-off system according to claim 2 or 3, characterized in that: The locking mechanism includes a locking block (410); The locking block (410) is fixedly disposed on the side wall of the locking head (41) near the blocking head (42); When the handle (1) is abutting against the side wall of the locking head (41) near the blocking head (42) on the side away from the blocking head (42), the handle (1) is located between the locking block (410) and the lifting seat (4).

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