Overpressure and underpressure mechanism for emergency cut-off valve

Abstract

The utility model provides an over-pressure and under-pressure mechanism for an emergency cut-off valve, which belongs to the technical field of cut-off valves, and comprises an air cylinder structure for converting air inlet pressure into one-way power, an air inlet of the air cylinder structure is communicated with a pipeline to be measured, and a second power output end of the air cylinder structure is used for outputting power; the overpressure power part is used for releasing movement locking after being subjected to power exceeding first preset power, and the overpressure power part is arranged at the first position; the undervoltage power part comprises a power source with second preset power, the power direction of the power source is opposite to that of the second power output end, and when the power of the second power output end is smaller than that of the power source, the second power output end moves to the first interval; the triggering mechanism is used for triggering different states under the driving of the second power output end; and the emergency cut-off is automatically realized by self machinery without depending on external power.

Description

Technical Field

[0001] The utility model belongs to the technical field of cut-off valves, and particularly relates to an overpressure / underpressure mechanism for an emergency cut-off valve. Background Art

[0002] An emergency cut-off valve is a remote-controlled emergency cut-off protection device integrated with overpressure / underpressure cut-off and safety protection, which is applied to high-pressure oil and gas pipelines in oil and gas fields. It plays an extremely important role in oil and gas pipeline transportation, and is an indispensable safety protection device in the safe operation of the system. When the pipeline fluid pressure is higher or lower than the set value, the triggering mechanism of the emergency cut-off valve quickly responds under the action of external force to avoid abnormal pipeline fluid medium pressure and prevent safety accidents. After the pipeline pressure returns to normal, the triggering mechanism can automatically reset and be reused. The property of the emergency cut-off valve requires that the configured triggering mechanism must be reliable, sensitive, have a short action time and a long service life.

[0003] In the existing overpressure / underpressure mechanism of the emergency cut-off valve, the overpressure mechanism and the underpressure mechanism are two sets of mechanisms. The overpressure mechanism and the underpressure mechanism need to separately introduce the fluid in the pipeline to be measured, resulting in more connecting pipes. Moreover, during use, assembly, debugging, and maintenance are all relatively complex, prone to leakage, and the reliability is relatively low. Content of the Utility Model

[0004] The purpose of the utility model is to provide an overpressure / underpressure mechanism for an emergency cut-off valve, which is used to reduce the connecting pipes in the whole system and reduce the number of connecting pipes between the overpressure mechanism and the underpressure mechanism and the pipeline to be measured.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An overpressure / underpressure mechanism for an emergency cut-off valve, comprising:

[0007] A cylinder structure for converting the intake pressure into a unidirectional power, the intake port of the cylinder structure is communicated with the pipeline to be measured, and the second power output end of the cylinder structure is used for outputting power;

[0008] An overpressure power part for unlocking the movement lock after receiving more than a first preset power, the overpressure power part is arranged at a first position;

[0009] An underpressure power part, the underpressure power part includes a power source with a second preset power, the power direction of the power source is opposite to the power direction of the second power output end, and when the power of the second power output end is less than the power of the power source, the second power output end moves to a first interval;

[0010] A triggering mechanism for triggering different states driven by the second power output end;

[0011] The second power output end is respectively connected to the overpressure power part, the underpressure power part and the triggering mechanism. When the power output by the second power output end is greater than the second preset power and less than the first preset power, the second power output end stops at the first position, and the triggering mechanism outputs a first triggering action; when the power output by the second power output end is greater than the first preset power, the second power output end crosses the first position, and the triggering mechanism outputs a second triggering action; when the power output by the second power output end is less than the second preset power, the second power output end moves to the first interval, and the triggering mechanism outputs a second triggering action.

[0012] The over- and under-pressure mechanism for the emergency cut-off valve further includes a transmission component. The first end of the transmission component is located on the moving path of the second power output end, and when the second power output end moves to the first position, the second power output end is in transmission connection with the first end, and the overpressure power part is in transmission connection with the second end of the transmission component.

[0013] The over- and under-pressure mechanism for the emergency cut-off valve further includes a main frame body. The body of the cylinder structure is fixed on the main frame body, the body of the overpressure power part is connected to the main frame body, the main frame body is connected to the underpressure power part, and the triggering mechanism is connected to the main frame body;

[0014] The first interval is the initial position of the second power output end when the cylinder structure is not subject to the pipeline input pressure to be measured.

[0015] The body of the underpressure power part is a transmission component between the overpressure power part and the second power output end. When the second power output end moves to the first position or crosses the first position, the power output by the second power output end is transmitted to the working end of the overpressure power part through the body of the underpressure power part;

[0016] When the second power output end is located in the first interval, the connection between the second power output end and the body of the underpressure power part is disconnected.

[0017] The triggering mechanism includes an energy storage and rebound mechanism, a one-way transmission component, a lock plate and a slider for hinging on the main frame body. The one-way transmission component is connected to the second power output end. One end of the lock plate adjacent to the slider has a triggering surface. The middle of the triggering surface has a trapezoidal convex part. The triggering surface includes the convex surface of the convex part and the first concave surface and the second concave surface on both sides of the convex surface. The other end of the lock plate adjacent to the slider is provided with a triggering component;

[0018] The working end of the energy storage and rebound mechanism is transmission-connected to the second power output end via the one-way transmission component. The working end of the energy storage and rebound mechanism is provided with a slider, which is contact-connected to the trigger surface.

[0019] When the second power output end is located at the first position, the slider is in contact connection with the raised surface, and the trigger component triggers a first trigger action;

[0020] When the second power output end exceeds the first position, the slider is in contact with the first concave surface, and the trigger component triggers a second trigger action;

[0021] When the second power output end is located in the first interval, the slider is in contact connection with the second concave surface, and the trigger component triggers the second trigger action.

[0022] The energy storage rebound mechanism includes a balance rod and a tension spring for being hinged on the main frame. The one-way transmission component is a pull ring with a through hole in the middle. One end of the balance rod passes through the through hole and is connected to the trigger surface through the slider. The other end of the balance rod is connected to one end of the tension spring. The other end of the tension spring is used to be connected to the main frame. The diameter of the balance rod part at the through hole is smaller than the diameter of the through hole.

[0023] The cylinder structure includes a piston cavity, an air intake channel and a piston opened in the middle of the main frame. The piston is slidably connected to the inner wall of the piston cavity, and the air intake channel is respectively connected to the piston cavity and the pipeline to be measured.

[0024] The overpressure power unit includes a reaction force cover, a reducing sleeve, a first elastic part and an adjustment block, the reaction force cover has a first sliding cavity for guiding and a second sliding cavity in the same direction as the guiding direction of the first sliding cavity, the adjustment block is slidably connected in the first sliding cavity, and the first elastic part is arranged between the adjustment block in the first sliding cavity and the inner wall of the reaction force cover; the reducing sleeve is slidably connected in the second sliding cavity, a sliding hole is provided on the adjustment block, the thinner end of the reducing sleeve passes through the sliding hole, and the sliding hole is slidably connected to the thinner end of the adjustment block; the diameter of the thicker end of the reducing sleeve is greater than the diameter of the sliding hole, and at least a part of the thicker end of the reducing sleeve is located outside the reaction force cover.

[0025] The first end of the transmission component is a side of the adjustment block connected to the first elastic part, and the second end of the transmission component is a side of the reducing sleeve connected to the second power output end.

[0026] The under-voltage power part includes the inner cavity of the variable-diameter sleeve and a power source. The power source is a second elastic part. One end of the second elastic part is connected to the inner wall of the inner cavity of the variable-diameter sleeve, and the other end of the second elastic part is connected to the second power output. The elastic force of the first elastic part is greater than that of the second elastic part. The adjacent second power output end and one end of the variable-diameter sleeve are in contact connection.

[0027] Compared with the prior art, in the over- and under-voltage mechanism for an emergency cut-off valve provided by the present utility model, the over-pressure mechanism and the under-voltage mechanism in the prior art are integrated. The triggering mechanism, the over-pressure power part, and the under-voltage power part are all connected to the second power output end. A cylinder structure is used to convert the fluid pressure inside the pipeline to be measured into the power output by the second power output end. When there is different power at the second power output end, the second power output end is in the first position, exceeds the first position, or is in the first interval under the action of the over-pressure power part and the under-voltage power part. Finally, the triggering mechanism triggers the first triggering action or the second triggering action according to the position of the second power output end. In the over- and under-voltage mechanism for an emergency cut-off valve provided by the present utility model, only one connecting pipe is needed to connect the pipeline to be measured with the inside of the cylinder structure, and the installation is relatively simple. During use, the problem of gas tightness all lies in the cylinder structure, which facilitates later maintenance. Description of the Drawings

[0028] Figure 1 is a schematic diagram of the overall structure of the over- and under-voltage mechanism for an emergency cut-off valve of the present utility model;

[0029] Figure 2 is a schematic diagram of the overall structure of the over- and under-voltage mechanism for an emergency cut-off valve of the present utility model in a working state;

[0030] Figure 3 is a schematic diagram of the overall structure of the over- and under-voltage mechanism for an emergency cut-off valve of the present utility model in another working state.

[0031] Reference numerals: 1, high-pressure nut; 2, low-pressure nut; 3, first elastic part; 4, second elastic part; 5, variable-diameter sleeve; 6, reaction cover; 7, limiting part; 8, piston; 81, second power output end; 9, main frame body; 10, pull ring; 11, balance rod; 12, lock plate; 13, lock block; 14, set screw; 15, tension spring; 16, pull rod rack; 17, adjusting block. Detailed Embodiments

[0032] In order to make the technical problems, technical solutions, and beneficial effects to be solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0033] Glossary of terms

[0034] Under-voltage power unit, a mechanism similar to a switch. The under-voltage power unit continuously applies a reverse thrust to the second power output end 81. When the power output from the second power output end 81 to the under-voltage power unit is less than the reverse thrust continuously applied by the under-voltage power unit to the second power output end 81, the under-voltage power unit pushes the second power output end 81 to move and resets the piston 8 to its initial position. When the power output from the second power output end 81 to the under-voltage power unit is greater than the reverse thrust continuously applied by the under-voltage power unit to the second power output end 81, the under-voltage power unit does not affect the movement of the second power output end 81.

[0035] Over-voltage power unit, a mechanism similar to a switch. When the pressure received exceeds the second preset power, the over-voltage power unit will provide an action, such as Figure 1 shown. When the pressure provided by the second power output end 81 received by the over-voltage power unit exceeds the second preset power, the adjustment block 17 will move upward. When the pressure received by the over-voltage power unit is less than the second preset value, the adjustment block 17 always remains in its starting position, as shown in Figure 1 or Figure 3 the position of the adjustment block 17 in.

[0036] The present utility model will be further described in detail below in conjunction with specific embodiments, which are explanations of the present utility model rather than limitations.

[0037] Please refer to Figure 1 , which shows a schematic diagram of the overall structure when the second power output end 81 of the over-under voltage mechanism for the emergency cut-off valve of the present utility model is in the first position. The over-under voltage mechanism for the emergency cut-off valve includes a cylinder structure, an over-voltage power unit, an under-voltage power unit, and a trigger mechanism.

[0038] The above-mentioned cylinder structure is used to convert the intake pressure into the driving force of the piston 8. The intake port of the cylinder structure is communicated with the pipeline to be measured, and the second power output end 81 of the cylinder structure is used to output power. Figure 1 The second power output end 81 in [] is the outer wall of the piston 8. The cylinder structure can adopt a finished cylinder in the prior art, but the material inside the cylinder needs to be unaffected by the gas in the pipeline to be measured. It can also adopt the cylinder structure in Figure 1 .

[0039] In one example, as shown in Figure 1 , the cylinder structure includes a piston chamber, an intake passage, and a piston 8 in the middle of the main frame 9. The piston 8 is slidably connected to the inner wall of the piston chamber, and the intake passage is respectively communicated with the piston chamber and the pipeline to be measured. Figure 2 The place A in [] is the intake passage where the gas in the pipeline to be measured enters the piston chamber. Figure 1A limiting portion 7 is provided at the upper end of the middle piston 8 to prevent the piston 8 from rushing out of the piston cavity.

[0040] The overpressure power unit is used to release the movement lock after receiving a force exceeding a first preset force. The overpressure power unit can adopt a torque limiter in the prior art. When a torque limiter is used, it needs to be hinged to the second power output end 81 to avoid the problem of the torque limiter's arc movement path during rotation not matching the linear movement path of the second power output end 81.

[0041] The above-mentioned super-pressure power unit can also be used as follows Figure 1 In the structure shown in , the overpressure power unit is set in the first position, and the overpressure power unit includes a reaction cover 6 fixed to the main frame 9, a reducing sleeve 5, a first elastic part 3 and an adjustment block 17. The reaction cover 6 has a first sliding cavity for guiding and a second sliding cavity with the same guiding direction as the first sliding cavity. The adjustment block 17 is slidably connected in the first sliding cavity. The first elastic part 3 is arranged between the adjustment block 17 in the first sliding cavity and the inner wall of the reaction cover 6; the reducing sleeve 5 is slidably connected in the second sliding cavity, and a sliding hole is provided on the adjustment block 17. The thinner end of the reducing sleeve 5 passes through the sliding hole, and the sliding hole is slidably connected to the thinner end of the adjustment block 17; the diameter of the thicker end of the reducing sleeve 5 is larger than the diameter of the sliding hole, and at least a part of the thicker end of the reducing sleeve 5 is located outside the reaction cover 6. When working, as Figure 1 As shown, if the power outputted by the second power output end 81 is greater than the power outputted by the first elastic portion 3, the second power output end 81 overcomes the elastic force of the first elastic portion 3, pushing the reducing sleeve 5 upward, which in turn drives the adjustment block 17 upward. If the power outputted by the second power output end 81 is greater than the second preset power but less than the first preset power, the second power output end 81 contacts the reducing sleeve 5 and applies pressure thereto, but the reducing sleeve 5 and the adjustment block 17 remain stationary. If the power outputted by the second power output end 81 is less than the second preset power, the second power output end 81 is pushed downward by the second elastic portion 4, and the reducing sleeve 5 and the second power output end 81 move away from each other. In one example, if the elastic force exerted by the second elastic portion 4 remains constant, the second power output end 81 is pushed to its initial position when the cylinder structure is not subjected to the desired measured pipeline input pressure. To facilitate installation of the first elastic portion 3, the first sliding cavity is sealed by the high-pressure nut 1. In order to facilitate the installation of the second elastic part 4 , the second sliding cavity is sealed by the low-pressure nut 2 .

[0042] For underpressure power unit and overpressure power unit, if Figure 1 and Figure 2As shown, the under-voltage power unit and the over-voltage power unit are combined together. Among them, the over-voltage power unit is a first annular structure, and the under-voltage power unit is an inner core ring structure matching the first annular structure. The body of the under-voltage power unit is used as a transmission component between the over-voltage power unit and the second power output end 81. When the second power output end 81 moves to the first position or crosses the first position, the power output by the second power output end 81 is transmitted to the working end of the over-voltage power unit through the body of the under-voltage power unit; as Figure 3 As shown, when the second power output end 81 is in the first interval, the connection between the second power output end 81 and the body of the under-voltage power unit is disconnected. Through the design of the first annular structure and the inner core ring structure, the space size of the entire device can be reduced, and the number of required connecting parts can be reduced, enabling the device to operate more stably during work.

[0043] The above-mentioned first elastic part 3 can be a compression spring, a cylinder with gas pressure inside, or a hydraulic cylinder with stable power provided by stable hydraulic oil. The second elastic part 4 can be a compression spring, a cylinder with gas pressure inside, or a hydraulic cylinder with stable power provided by stable hydraulic oil.

[0044] The above-mentioned adjustment block 17 is a ring structure, and the variable-diameter sleeve 5 is a cylindrical structure with a step. The thinner end of the variable-diameter sleeve 5 is inserted into the inner ring hole of the adjustment block 17, and the thicker end of the variable-diameter sleeve 5 is stuck on one side of the inner ring hole of the adjustment block 17. As Figure 1 As shown, when the variable-diameter sleeve 5 moves upward, the variable-diameter sleeve 5 drives the adjustment block 17 to move upward. When the variable-diameter sleeve 5 moves downward, the adjustment block 17 is separated from the variable-diameter sleeve 5. The above structure realizes the function of one-way power transmission. The above-mentioned variable-diameter sleeve 5 and adjustment block 17 are transmission components. The first end of the transmission component is one side of the adjustment block 17 connected to the first elastic part 3, and the second end of the transmission component is one side of the variable-diameter sleeve 5 connected to the second power output end 81. The first end of the transmission component is located on the moving path of the second power output end 81, and when the second power output end 81 moves to the first position, the second power output end 81 is in transmission connection with the first end, and the over-voltage power unit is in transmission connection with the second end of the transmission component.

[0045] The above-mentioned under-voltage power unit includes a power source with a second preset power. The power direction of the power source is opposite to that of the second power output end 81. When the power of the second power output end 81 is less than that of the power source, the second power output end 81 moves to the first interval. The under-voltage power unit includes the inner cavity of the variable-diameter sleeve 5 and the power source. The power source is the second elastic part 4. One end of the second elastic part 4 is connected to the inner wall of the inner cavity of the variable-diameter sleeve 5, and the other end of the second elastic part 4 is connected to the second power output. The elastic force of the first elastic part 3 is greater than that of the second elastic part 4. One end of the adjacent second power output end 81 and the variable-diameter sleeve 5 is in contact connection. The under-voltage power unit is used to drive the second power output end 81 to move downward to the first interval when the power of the second power output end 81 is too small. The initial position of the above-mentioned first interval is the position where the second power output end 81 is located when the cylinder is not affected by the pipeline pressure to be measured. The termination position of the above-mentioned first interval is the position where the second power output end 81 is located when the force output by the piston 8 under the action of the pipeline pressure to be measured is greater than the elastic force of the second elastic part 4 and less than the elastic force of the first elastic part 3.

[0046] The above-mentioned trigger mechanism is used to trigger different states under the drive of the second power output end 81. The second power output end 81 is respectively connected to the over-voltage power unit, the under-voltage power unit and the trigger mechanism. When the power output by the second power output end 81 is greater than the second preset power and less than the first preset power, the second power output end 81 stops at the first position, and the trigger mechanism outputs the first trigger action; when the power output by the second power output end 81 is greater than the first preset power, the second power output end 81 crosses the first position, and the trigger mechanism outputs the second trigger action; when the power output by the second power output end 81 is less than the second preset power, the second power output end 81 moves to the first interval, and the trigger mechanism outputs the second trigger action.

[0047] For the trigger mechanism, in one embodiment, the trigger mechanism includes an energy storage and rebound mechanism with the body fixed on the main frame 9, a one-way transmission component, a locking plate 12 and a slider. The energy storage and rebound mechanism includes a balance rod 11 and a tension spring 15 hinged on the main frame 9. The one-way transmission component is a pull ring or a rope with a through hole in the middle. One end of the balance rod 11 passes through the through hole and is connected to the trigger surface through the slider. The other end of the balance rod 11 is connected to one end of the tension spring 15, and the other end of the tension spring 15 is connected to the main frame 9. The diameter of the part of the balance rod 11 at the through hole is smaller than the diameter of the through hole. The slider is used to slide on the trigger surface of the locking plate 12, such as Figure 1As shown, preferably, the slider is a circular roller for contacting the trigger surface and transmitting the force transmitted by the balance rod 11. The one-way transmission component is connected to the second power output end 81. The locking plate 12 is hinged to the main frame 9, and the locking plate 12 is directly hinged to the main frame 9. One end of the locking plate 12 adjacent to the slider has a trigger surface. The middle of the trigger surface has a trapezoidal convex portion. The trigger surface includes the convex surface of the convex portion and the first concave surface and the second concave surface on both sides of the convex surface. The other end of the locking plate 12 where it is hinged is provided with a trigger component. The working end of the energy storage and rebound mechanism is in transmission connection with the second power output end 81 through the one-way transmission component. The working end of the energy storage and rebound mechanism is provided with a slider, and the slider is in contact connection with the trigger surface. The slider therein is used to slide on the trigger surface of the locking plate 12, such as Figure 1 As shown, preferably, the slider is a circular roller for contacting the trigger surface and transmitting the force transmitted by the balance rod 11. In one example, the one-way transmission component can be a rope for transmitting power unidirectionally, such as Figure 1 As shown, the rope directly connects the piston 8 and the balance rod 11. When the piston 8 moves upward, the piston 8 moves upward and pulls the balance rod 11 upward. When the piston 8 moves downward, the rope does not transmit power. In another example, the one-way transmission component can be Figure 1 the pull ring 10 in. A pull ring with a through hole in the middle is adopted, and the purpose is that the material can be made of a solid wear-resistant material to ensure the stability of its transmission during operation.

[0048] During specific operation, when the medium pressure of the pipeline exceeds the set pressure value, the valve is in the closed state, such as Figure 2 As shown, it specifically includes:

[0049] When the medium pressure of the pipeline exceeds the set pressure value, it pushes the piston 8 to compress the first elastic part 3. The piston 8 moves upward and pulls the left end of the balance rod 11 upward. The balance rod 11 drives the roller at the left end to roll upward and contact the first concave surface of the locking plate 12. The locking plate 12 rotates clockwise by 6° around its own hinge point. The set screw 14 at the lower end of the locking plate moves leftward and disengages from the lock block 13. The lock block 13 disengages from the pull rod rack 16. The valve closes. In the case of continuous abnormal pipeline pressure, the valve implements on-site protection unless the pipeline pressure returns to normal pressure.

[0050] When the medium pressure of the pipeline is lower than the set pressure value, the valve is in the closed state, such as Figure 3 As shown, it specifically includes:

[0051] When the medium pressure in the pipeline is lower than the set pressure value, the second elastic part 4 pushes the piston 8, and the piston 8 drives the pull ring 10 to move downward. The tension spring 15 pulls the right end of the balance rod 11 to move upward, and the balance rod 11 drives the roller at the left end to roll downward and contact the second concave surface of the lock plate 12. The lock plate 12 rotates 6° clockwise around the cylindrical screw, and the set screw 14 at the lower end of the lock plate moves to the left and disengages from the lock block 13. The lock block 13 disengages from the pull rod rack 16, and the valve is closed. If the pipeline pressure abnormality persists, the valve will be protected on site unless the pipeline pressure returns to normal.

[0052] When the medium in the pipeline is at normal pressure, the valve is in the open state, such as Figure 1 As shown, specifically including:

[0053] The roller at the left end of the balancing rod 11 contacts the raised surface. The set screw 14 at the lower end of the lock plate moves leftward and contacts the locking block 13.

[0054] In another embodiment, the trigger mechanism includes an energy storage and rebound mechanism whose main body is fixed to the main frame 9, a one-way transmission component, a lock plate 12, a slider and a torsion spring. The energy storage and rebound mechanism includes a balance bar 11 and a tension spring 15 hinged on the main frame 9. The one-way transmission component is a pull ring 10 with a through hole in the middle. One end of the balance bar 11 passes through the through hole and is connected to the trigger surface through the slider. The other end of the balance bar 11 is connected to one end of the tension spring 15, and the other end of the tension spring 15 is connected to the main frame 9. The diameter of the balance bar 11 at the through hole is smaller than the diameter of the through hole. The slider is used to slide on the trigger surface on the lock plate 12, such as Figure 1 As shown, preferably, the slider is a circular roller, which is used to contact the trigger surface and transmit the force transmitted by the balance bar 11.

[0055] A one-way transmission component is connected to the second power output end 81, a lock plate 12 is hinged to the main frame 9, one end of a torsion spring is connected to the lock plate 12, and the other end of the torsion spring is connected to the main frame 9. The end of the lock plate 12 adjacent to the slider has a trigger surface, the trigger surface includes a convex surface of a convex portion, and a first concave surface and a second concave surface located on both sides of the convex surface. The other hinged end of the lock plate 12 is provided with a trigger component; the working end of the energy storage and rebound mechanism is transmission-connected to the second power output end 81 through a one-way transmission component, and the working end of the energy storage and rebound mechanism is provided with a slider, which is in contact with the trigger surface;

[0056] When the second power output end 81 is in the first position, the slider is in contact with the raised surface, and the trigger component triggers the first trigger action. Figure 1As shown, at this time, the pull ring 10 pulls one end of the slider of the balance rod 11, which overcomes the reverse force of the tension spring 15, causing the slider to contact the raised surface, the lock plate 12 to move away from the slider, and the lock block 13 to approach the pull rod rack 16. The approach of the lock block 13 to the pull rod rack 16 is the first triggering action.

[0057] When the second power output end 81 passes the first position, the slider is in contact with the first concave surface, and the trigger component triggers the second trigger action; Figure 2 As shown, the pull ring 10 moves upward, and one end of the slider of the balance bar 11 continues to overcome the reverse force of the tension spring 15, causing the slider to enter the first concave surface, the lock plate 12 and the slider to be relatively close, and the lock block 13 to be away from the pull rod rack 16. The lock block 13 moving away from the pull rod rack 16 is the second triggering action.

[0058] When the second power output end 81 is located in the first interval, the slider is in contact with the second concave surface, and the trigger component triggers the second trigger action. Figure 3 As shown, the pull ring 10 now moves downward, the balance bar 11 hangs in the middle of the through-hole, and the pull ring 10 is not in contact with the slider end of the balance bar 11. At this point, the tension spring 15 pulls the balance bar 11 away from the slider end, causing the slider end of the balance bar 11 to move downward, entering the second concave surface. The lock plate 12 and the slider come into relative proximity, and the lock block 13 moves away from the pull rod rack 16. This movement of the lock block 13 away from the pull rod rack 16 represents the second triggering action. The lock block 13 engages with the pull rod rack 16.

[0059] The above-mentioned overpressure and underpressure mechanism for emergency shut-off valve also includes a main frame 9, the main body of the cylinder structure is fixed on the main frame 9, the main body of the overpressure power unit is connected to the main frame 9, the main frame 9 is connected to the underpressure power unit, and the trigger mechanism is connected to the main frame 9.

[0060] In summary, the overpressure and underpressure mechanism for emergency shut-off valves provided by the present invention is an integration of the overpressure mechanism and the underpressure mechanism in the prior art. It connects the trigger mechanism, the overpressure power unit and the underpressure power unit to the second power output end, and uses a cylinder structure to convert the fluid pressure inside the pipeline to be measured into power output by the second power output end. In the case where the second power output end has different powers, the second power output end is in the first position, exceeds the first position or is in the first interval under the action of the overpressure power unit and the underpressure power unit. The final trigger mechanism triggers the first trigger action or the second trigger action according to the position of the second power output end. The overpressure and underpressure mechanism for emergency shut-off valves provided by the present invention only requires one connecting pipe to connect the pipeline to be measured with the inside of the cylinder structure, and is relatively simple to use and install. During use, all gas sealing issues fall on the cylinder structure, which facilitates subsequent maintenance.

[0061] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0063] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0064] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0065] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. An overpressure and underpressure mechanism for an emergency shut-off valve, characterized in that: include: A cylinder structure for converting intake pressure into unidirectional power, wherein the intake port of the cylinder structure is connected to a pipe to be measured, and the second power output end of the cylinder structure is used to output power; an overpressure power unit for releasing the movement lock after receiving a power exceeding a first preset power, the overpressure power unit being arranged in a first position; an undervoltage power unit, the undervoltage power unit comprising a power source having a second preset power, wherein a power direction of the power source is opposite to a power direction of the second power output end, and when the power of the second power output end is less than the power of the power source, the second power output end moves to the first interval; A trigger mechanism for triggering different states under the drive of the second power output end; The second power output end is connected to the overpressure power part, the underpressure power part and the trigger mechanism respectively. When the power output by the second power output end is greater than the second preset power and less than the first preset power, the second power output end stops at the first position, and the trigger mechanism outputs the first trigger action; when the power output by the second power output end is greater than the first preset power, the second power output end passes the first position, and the trigger mechanism outputs the second trigger action; when the power output by the second power output end is less than the second preset power, the second power output end moves to the first interval, and the trigger mechanism outputs the second trigger action.

2. The over- and under-voltage mechanism for an emergency shut-off valve according to claim 1, characterized in that, The over-pressure and under-pressure mechanism for the emergency shut-off valve also includes a transmission component, the first end of which is located on the moving path of the second power output end, and when the second power output end moves to the first position, the second power output end is transmission-connected to the first end, and the over-pressure power unit is transmission-connected to the second end of the transmission component.

3. The over-under voltage mechanism for the emergency cut-off valve according to claim 2, characterized in that, The over-pressure and under-pressure mechanism for the emergency shut-off valve further comprises a main frame, the main body of the cylinder structure is fixed on the main frame, the main body of the over-pressure power unit is connected to the main frame, the main frame is connected to the under-pressure power unit, and the trigger mechanism is connected to the main frame; The first interval is an initial position of the second power output end when the cylinder structure is not subjected to the pipeline input pressure to be measured.

4. The over- and under-voltage mechanism for an emergency cut-off valve according to claim 2, characterized in that, The body of the underpressure power unit is a transmission component between the overpressure power unit and the second power output end. When the second power output end moves to the first position or exceeds the first position, the power output from the second power output end is transmitted to the working end of the overpressure power unit through the body of the underpressure power unit. When the second power output end is located in the first interval, the connection between the second power output end and the body of the undervoltage power unit is disconnected.

5. The over- and under-voltage mechanism for an emergency cut-off valve according to claim 2, characterized in that, The triggering mechanism includes an energy storage and rebound mechanism, a one-way transmission component, a lock plate and a slider hinged to the main frame body. The one-way transmission component is connected to the second power output end. One end of the lock plate adjacent to the slider has a triggering surface. The middle of the triggering surface has a trapezoidal convex part. The triggering surface includes the convex surface of the convex part, and the first concave surface and the second concave surface on both sides of the convex surface. The other end of the lock plate adjacent to the slider is provided with a triggering component; The working end of the energy storage and rebound mechanism is drivingly connected to the second power output end through the one-way transmission component. The working end of the energy storage and rebound mechanism is provided with a slider, and the slider is in contact connection with the triggering surface; When the second power output end is at the first position, the slider is in contact connection with the convex surface, and the triggering component triggers the first triggering action; When the second power output end crosses the first position, the slider is in contact connection with the first concave surface, and the triggering component triggers the second triggering action; When the second power output end is in the first interval, the slider is in contact connection with the second concave surface, and the triggering component triggers the second triggering action.

6. The under-voltage and over-voltage mechanism for an emergency shut-off valve according to claim 5, characterized in that, The energy storage and rebound mechanism includes a balance rod and a tension spring hinged to the main frame body. The one-way transmission component is a pull ring with a through hole in the middle. One end of the balance rod passes through the through hole and is connected to the triggering surface through the slider. The other end of the balance rod is connected to one end of the tension spring, and the other end of the tension spring is used to be connected to the main frame body. The diameter of the part of the balance rod at the through hole is smaller than the diameter of the through hole.

7. The over-pressure and under-pressure mechanism for an emergency shut-off valve according to claim 2, characterized in that: The cylinder structure includes a piston chamber, an air inlet channel and a piston opened in the middle of the main frame body. The piston is slidably connected to the inner wall of the piston chamber. The air inlet channel is respectively communicated with the piston chamber and the pipeline to be measured.

8. The ultra-underpressure mechanism for an emergency cut-off valve according to claim 2, characterized in that, The overpressure power part includes a reaction cover, a variable diameter sleeve, a first elastic part and an adjustment block. The inside of the reaction cover has a first sliding cavity for guiding and a second sliding cavity in the same guiding direction as the first sliding cavity. The adjustment block is slidably connected in the first sliding cavity. The first elastic part is arranged between the adjustment block in the first sliding cavity and the inner wall of the reaction cover; the variable diameter sleeve is slidably connected in the second sliding cavity. A sliding hole is opened on the adjustment block, and the thinner end of the variable diameter sleeve passes through the sliding hole, and the sliding hole is slidably connected to the thinner end of the adjustment block; the diameter of the thicker end of the variable diameter sleeve is larger than the diameter of the sliding hole, and at least a part of the thicker end of the variable diameter sleeve is located outside the reaction cover.

9. The over- and under-voltage mechanism for an emergency cut-off valve according to claim 8, characterized in that, One end of the transmission component is the surface of the adjustment block connected to the first elastic part, and the other end of the transmission component is the surface of the variable diameter sleeve connected to the second power output end.

10. The over-under voltage mechanism for an emergency cut-off valve according to claim 8, characterized in that, The under-voltage power part includes the inner cavity of the variable-diameter sleeve and a power source. The power source is a second elastic part. One end of the second elastic part is connected to the inner wall of the inner cavity of the variable-diameter sleeve, and the other end of the second elastic part is connected to the second power output. The elastic force of the first elastic part is greater than that of the second elastic part. The adjacent second power output end and one end of the variable-diameter sleeve are in contact connection.

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