Safety shut-off valve director

Abstract

The utility model discloses a safety shut-off valve director which comprises a first shell, the first shell is sequentially provided with a first cavity, a connecting channel and a second cavity from top to bottom, the connecting channel is used for communicating the first cavity with the second cavity, a first elastic extrusion mechanism is arranged in the first cavity, a cylindrical pin is arranged in the connecting channel in a penetrating mode, and a second elastic extrusion mechanism is arranged in the second cavity. One end of the cylindrical pin abuts against the first elastic extrusion mechanism, the other end of the cylindrical pin abuts against the first plugging mechanism, one end of the first plugging mechanism is detachably connected into the second cavity, and the other end of the first plugging mechanism can move in a telescopic mode in the axial direction of the second cavity. The second shell is detachably connected with the first shell, a pressure feedback opening, a pressure relief opening and a third cavity are formed in the second shell, and one end of the pressure feedback opening communicates with the second cavity. Therefore, the influence of the motion frequency and the low-temperature environment can be reduced, the response is rapid, and the stability and the reliability of overpressure cutting are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a safety cut-off valve actuator. Background Art

[0002] The safety cut-off valve actuator is an actuator that controls the opening and closing of a safety cut-off valve, and has the function of opening the safety cut-off valve according to the pressure change and operation control in the pipeline.

[0003] In related technologies, most safety cut-off valve actuators adopt a piston structure. This design relies on gas pressure directly acting on the piston to overcome the resistance of a preset spring to achieve an automatic cut-off mechanism under overpressure conditions. However, since the sealing performance of the piston structure mainly relies on an O-ring to achieve the sealing function, when the piston does not move for a long time, the frictional resistance between the sealing ring and the piston will increase, resulting in movement jamming. Or in a low-temperature environment below -20°C, the hardness of the sealing ring increases, which will also increase the frictional force between the piston and the sealing ring, exacerbate the wear of the sealing ring, lead to a decrease in sealing performance, and cause movement jamming. Therefore, this safety cut-off valve actuator is greatly affected by the movement frequency and low-temperature environment, and the response is not rapid, thus affecting the reliability and stability of overpressure cut-off. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems in the related technologies to a certain extent.

[0005] For this reason, an object of the utility model is to provide a safety cut-off valve actuator, which can reduce the influence of movement frequency and low-temperature environment, has a rapid response, and thus improves the stability and reliability of overpressure cut-off.

[0006] To achieve the above object, the present utility model provides a safety cut-off valve actuator, comprising: a first housing, which is successively provided with a first cavity, a connection channel and a second cavity from top to bottom, and the connection channel is used to communicate the first cavity and the second cavity. Wherein, a first elastic extrusion mechanism is arranged in the first cavity, a cylindrical pin is inserted through the connection channel, one end of the cylindrical pin abuts against the first elastic extrusion mechanism, the other end of the cylindrical pin abuts against a first plugging mechanism, one end of the first plugging mechanism is detachably connected to the second cavity, and the other end of the first plugging mechanism can telescopically move along the axial direction of the second cavity; a second housing, which is detachably connected to the first housing, and a pressure feedback port, a pressure relief port and a third cavity are formed in the second housing. Wherein, one end of the pressure feedback port is communicated with the second cavity, the pressure relief port is communicated with the second cavity and the third cavity respectively, and the end of the first plugging mechanism away from the cylindrical pin can be hermetically abutted against the communication port where the pressure relief port is communicated with the second cavity, so as to seal the pressure fed back from the pressure feedback port to the second cavity. A second plugging mechanism is arranged in the third cavity; a truncation assembly, which is arranged on one side of the second housing, one end of the second plugging mechanism is fixed in the third cavity, and the other end of the second plugging mechanism can movably penetrate through the truncation assembly to control the opening of the truncation assembly.

[0007] For the safety cut-off valve actuator of the present utility model, if the air pressure in the pressure feedback port abnormally increases until the pressure fed back from the rear end of the valve to the pressure feedback port is greater than the set value of the first elastic extrusion mechanism, under the action of the feedback pressure, one end of the first plugging mechanism will contract and push the cylindrical pin to move away from the pressure relief port, thereby releasing the sealed state of the pressure relief port and enabling the pressure relief port to communicate with the second cavity. As the pressure continues to rise, this part of the pressure will then flow into the third cavity, pushing one end of the second plugging mechanism to axially move and triggering the activation of the truncation assembly, ultimately realizing the rapid closing of the valve to cope with potential overpressure risks. The first plugging mechanism can separate the first cavity and the second cavity to prevent the pressure in the second cavity from entering the first cavity, and can also force one end of the first plugging mechanism to move when the pressure in the second cavity is abnormal. The moving distance is absorbed by the telescopic characteristic of the first plugging mechanism. Similarly, the second plugging mechanism can both seal the pressure relief port and utilize the telescopic characteristic of the second plugging mechanism to enable one end of the second plugging mechanism to move to meet the control requirements of the truncation assembly. Therefore, compared with the traditional structure using a piston and a sealing ring to meet the characteristics of both movement and sealing, it can not only ensure the normal use of this safety cut-off valve actuator, but also reduce the influence of the movement frequency and low-temperature environment, respond quickly, and thus improve the stability and reliability of overpressure cut-off.

[0008] In addition, the safety cut-off valve actuator proposed according to the above application may also have the following additional technical features:

[0009] Specifically, the first elastic extrusion mechanism includes an external thread member, a first spring, and an extrusion block. Among them, a first opening is provided at one end of the first housing away from the second housing; the external thread member is threadedly connected in the first housing, and the external thread member is arranged adjacent to the first opening; one end of the first spring is fixedly connected to the external thread member, and the other end of the first spring is fixedly connected to the extrusion block; the end of the extrusion block away from the first spring abuts against the cylindrical pin.

[0010] Specifically, the first plugging mechanism includes a first fixed seat, a first bellows, a first base, a connecting block, and a sealing block. Among them, the first fixed seat is detachably connected in the second cavity, and a first through hole penetrating in the axial direction is provided above the first fixed seat, and one end of the cylindrical pin passes through the first through hole and abuts against the first base; one end of the first bellows is sleeved and fixed on the outer wall of the first fixed seat, and the other end of the first bellows is fixed on the outer wall of the first base; the connecting block is fixed on the end of the first base away from the first bellows; one end of the sealing block is fixed on the connecting block, and the other end of the sealing block abuts against the communication port where the pressure relief port is communicated with the second cavity.

[0011] Specifically, the extrusion block and the end of the first base adjacent to the cylindrical pin are respectively provided with limit grooves adapted to the shape of the cylindrical pin, and both ends of the cylindrical pin respectively abut against the corresponding limit grooves.

[0012] Specifically, the second plugging mechanism includes a second fixed seat, a second bellows, a second base, a firing pin, a second spring, and a first external thread sleeve. Among them, the second fixed seat is fixed in the third cavity, and the second fixed seat is provided with a connection port communicated with the second bellows, and the connection port is communicated with the pressure relief port; one end of the second bellows is fixed on the outer wall of the second fixed seat, the other end of the second bellows is fixed on the outer wall of the second base, and the second base can move relative to the second fixed seat; one end of the first external thread sleeve is arranged in the third cavity, and the other end of the first external thread sleeve is arranged in the truncation assembly; the firing pin is slidably connected in the first external thread sleeve, and one end of the firing pin is fixedly connected to the second fixed seat.

[0013] Specifically, the truncation component includes a third housing, an upper cover, a limiting mechanism, a pull rod, a truncation mechanism, a first reset mechanism, a manual cutting mechanism, and a second reset mechanism. Among them, the third housing is disposed on one side of the second housing, and a second opening is formed in the third housing. An upper cover is detachably connected to the second opening. One end of the first external thread sleeve away from the second housing is disposed in the third housing. A fourth cavity and a stepped hole are formed in the third housing, and the fourth cavity and the stepped hole are respectively communicated. The limiting mechanism is disposed in the fourth cavity, and one end of the striker away from the second fixed seat abuts against the limiting mechanism. The pull rod passes through the limiting mechanism, and the pull rod is longitudinally movable relative to the limiting mechanism. One end of the pull rod is threadedly connected to the first reset mechanism, and the other end of the pull rod passes through the stepped hole and is threadedly connected to the truncation mechanism. The truncation mechanism includes a third spring and a weight. One end of the third spring is fixed in the stepped hole, and the other end of the third spring is fixedly connected to the weight. The first reset mechanism is threadedly connected to the upper cover. The manual cutting mechanism and the second reset mechanism are respectively disposed on the third housing, and the moving end of the manual cutting mechanism can abut against the limiting mechanism, and the moving end of the second reset mechanism abuts against the limiting mechanism.

[0014] Specifically, the limiting mechanism includes a runner, a support frame, and a ball. Among them, the support frame is disposed in the fourth cavity, and a plurality of second through holes are formed in the support frame. One ball is arranged in each second through hole, and the ball is simultaneously clamped in an annular groove formed on the outer wall of the pull rod to limit the position of the pull rod. The runner is rotatably connected to the outer wall of the support frame, and a plurality of grooves are formed in the inner wall of the runner. When the runner is in the cutting state, the grooves are communicated with the corresponding second through holes. When the runner is in the reset state, the grooves are misaligned with the corresponding second through holes.

[0015] Specifically, the first reset mechanism includes a support, a toothed rod, and a wrench. Among them, the support is threadedly connected to the upper cover. A guiding hole axially penetrating the support is formed in the support, and a third opening is formed on the outer wall of the support. The toothed rod is slidably connected in the guiding hole, and one end of the toothed rod close to the upper cover passes through the upper cover and is threadedly connected to the pull rod. The wrench is rotatably connected in the third opening, and the wrench meshes with the toothed rod.

[0016] Specifically, the manual cutting mechanism includes a second external thread sleeve, a first ejector rod, and a button. Among them, the second external thread sleeve is threadedly connected to the third housing, and the second external thread sleeve penetrates through the side wall of the third housing; the first ejector rod is slidably connected in the smooth hole of the second external thread sleeve, and one end of the first ejector rod can abut against the runner; the button is fixed on the first ejector rod.

[0017] Specifically, the second reset mechanism includes a guide sleeve, a fourth spring, a plug, and a second ejector rod. Among them, the guide sleeve is fixed on the third housing, and one end of the guide sleeve communicates with the fourth cavity, and the guide sleeve is slidably connected with the second ejector rod, and one end of the second ejector rod penetrates through the guide sleeve and abuts against the runner; one end of the fourth spring is fixedly connected to the second ejector rod, and the other end of the fourth spring is in contact with the plug; the plug is threadedly connected in the guide sleeve. Description of the Drawings

[0018] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments in accordance with the present invention and, together with the specification, are used to explain the principles of the present invention.

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic structural diagram of a safety cut-off valve actuator according to an embodiment of the present invention;

[0021] Figure 2 It is for an embodiment of the present invention Figure 1 The enlarged structural schematic diagram of area A therein;

[0022] Figure 3 It is for another embodiment of the present invention Figure 1 The enlarged structural schematic diagram of area B therein;

[0023] Figure 4 It is a schematic diagram of the runner of the safety cut-off valve actuator in the cut-off state according to an embodiment of the present invention;

[0024] Figure 5 It is a schematic diagram of the runner of the safety cut-off valve actuator in the reset state according to an embodiment of the present invention.

[0025] As shown in the figure:

[0026] 1. First housing; 10. First cavity; 11. Connection channel; 12. Second cavity; 13. First elastic extrusion mechanism; 14. Cylindrical pin; 15. First sealing mechanism; 130. External threaded part; 131. First spring; 132. Extrusion block; 150. First fixing seat; 151. First bellows; 152. First base; 153. Connection block; 154. Sealing block;

[0027] 2. Second housing; 20. Pressure feedback port; 21. Pressure relief port; 22. Third cavity; 23. Second sealing mechanism; 230. Second fixing seat; 231. Second bellows; 232. Second base; 233. Firing pin; 234. Second spring; 235. First external threaded sleeve;

[0028] 3. Truncation assembly; 30. Third housing; 31. Upper cover; 32. Limiting mechanism; 33. Pull rod; 34. Truncation mechanism; 35. First reset mechanism; 36. Manual cut-off mechanism; 37. Second reset mechanism; 300. Fourth cavity; 301. Step hole; 320. Runner; 321. Support frame; 322. Ball; 340. Third spring; 341. Weight; 350. Support; 351. Rack; 352. Wrench; 360. Second external threaded sleeve; 361. First ejector rod; 362. Button; 370. Guide sleeve; 371. Fourth spring; 372. Plug; 373. Second ejector rod; 3500. Third opening. Detailed implementation manners

[0029] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the solution of the present invention will be further described below. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0030] Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0031] The safety cut-off valve actuator of the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0032] The safety cut-off valve actuator provided by the embodiment of the present invention can be applied to a safety cut-off valve.

[0033] As Figure 1 shown, the safety cut-off valve actuator of the embodiment of the present invention may include a first housing 1, a second housing 2 and a truncation assembly 3.

[0034] Among them, the first housing 1 is successively provided with a first cavity 10, a connection channel 11, and a second cavity 12 from top to bottom, and the connection channel 11 is used to communicate the first cavity 10 and the second cavity 12.

[0035] Among them, a first elastic extrusion mechanism 13 is arranged in the first cavity 10, a cylindrical pin 14 is inserted through the connection channel 11, one end of the cylindrical pin 14 abuts against the first elastic extrusion mechanism 13, the other end of the cylindrical pin 14 abuts against a first blocking mechanism 15, one end of the first blocking mechanism 15 is detachably connected to the second cavity 12, and the other end of the first blocking mechanism 15 can telescopically move along the axial direction of the second cavity 12.

[0036] The second housing 2 is detachably connected to the first housing 1, and a pressure feedback port 20, a pressure relief port 21, and a third cavity 22 are formed in the second housing 2. Among them, one end of the pressure feedback port 20 is communicated with the second cavity 12.

[0037] It should be noted that the end of the pressure feedback port 20 far from the second cavity 12 described in this embodiment is communicated with the pipeline at the rear end of the external valve, which can sense and transmit the pressure change of the rear-end pipeline in real time, ensure that this safety cut-off valve actuator can accurately sense the external pressure state, and quickly respond when the pressure is abnormal.

[0038] The pressure relief port 21 is respectively communicated with the second cavity 12 and the third cavity 22. One end of the first blocking mechanism 15 far from the cylindrical pin 14 can be hermetically abutted against the communication port where the pressure relief port 21 is communicated with the second cavity 12, and is used to seal the pressure feedback from the pressure feedback port 20 to the second cavity 12. A second blocking mechanism 23 is arranged in the third cavity 22. Among them, the first blocking mechanism 15 effectively isolates the pressure feedback from the pressure feedback port 20 to the second cavity 12, preventing unnecessary pressure transmission and interference.

[0039] It should be noted that a sealing head is detachably connected to the end of the pressure relief port 21 far from the third cavity 22 described in this embodiment to ensure the pressure in the pressure relief port 21, effectively isolate the influence of the external environment on the pressure in the pressure relief port 21, and at the same time, when this safety cut-off valve actuator is reset, the sealing head needs to be opened to release and empty the accumulated pressure in the pressure relief port 21, so as to ensure that one end of the second blocking mechanism 23 inserted into the truncating assembly 3 returns to the initial position, improving the accuracy and reliability of the reset operation.

[0040] The truncating assembly 3 is arranged on one side of the second housing 2. One end of the second blocking mechanism 23 is fixed in the third cavity 22, and the other end of the second blocking mechanism 23 can be movably inserted into the truncating assembly 3 to control the opening of the truncating assembly 3.

[0041] Specifically, when the air pressure in the pipeline at the rear end of the valve sensed by the pressure feedback port 20 maintains a normal state, the first elastic extrusion mechanism 13 has a certain initial pre-tightening force, so that one end of the first elastic extrusion mechanism 13 applies a certain abutting force to the first sealing mechanism 15, ensuring that one end of the first sealing mechanism 15 can abut and seal on the communication port where the pressure relief port 21 communicates with the second cavity 12, closing the pressure relief port 21. Refer to Figure 1 as shown. At this time, when the feedback pressure of the pipeline at the rear end of the valve is lower than the pre-tightening force setting value of the first elastic extrusion mechanism 13, this safety cut-off valve actuator remains in the reset state, and the safety cut-off valve is in the open position.

[0042] If the air pressure in the pressure feedback port 20 rises abnormally until the pressure fed back to the pressure feedback port 20 at the rear end of the valve is greater than the setting value of the first elastic extrusion mechanism 13, under the action of the feedback pressure, one end of the first sealing mechanism 15 will contract, and the cylindrical pin 14 will be pushed to move away from the pressure relief port 21, thereby releasing the sealing state of the pressure relief port 21, enabling the pressure relief port 21 to communicate with the second cavity 12. As the pressure continues to rise, this part of the pressure will then flow into the third cavity 22, pushing one end of the second sealing mechanism 23 to move axially, triggering the activation of the truncation assembly 3, and finally realizing the rapid closing of the valve to cope with potential overpressure risks.

[0043] If it is necessary to restore the valve to the normal working state, relevant personnel first reduce the feedback pressure at the rear end of the valve to ensure that the reset pressure difference is met, and then control the truncation assembly 3 to reset the safety cut-off valve actuator to its initial state (i.e., the reset state).

[0044] In the above process, the first sealing mechanism 15 can not only separate the first cavity 10 and the second cavity 12 to prevent the pressure in the second cavity 12 from entering the first cavity 10, but also force one end of the first sealing mechanism 15 to move when the pressure in the second cavity 12 is abnormal, and the moving distance is absorbed by the telescopic characteristic of the first sealing mechanism 15. Similarly, the second sealing mechanism 23 can not only seal the pressure relief port 21, but also utilize the telescopic characteristic of the second sealing mechanism 23 to enable one end of the second sealing mechanism 23 to move to meet the control requirements of the truncation assembly 3. Therefore, compared with the traditional structure using a piston and a sealing ring to meet the characteristics of both movement and sealing, it can not only ensure the normal use of this safety cut-off valve actuator, but also reduce the influence of the movement frequency and low-temperature environment, respond quickly, and thus improve the stability and reliability of overpressure cut-off.

[0045] In an embodiment of the present utility model, as Figure 1 shown, the first elastic extrusion mechanism 13 includes an external thread part 130, a first spring 131, and an extrusion block 132.

[0046] One end of the first housing 1 away from the second housing 2 is provided with a first opening (not marked in the figure). The external threaded member 130 is threadedly connected in the first housing 1, and the external threaded member 130 is arranged adjacent to the first opening.

[0047] It should be noted that the first housing 1 is provided with an internal threaded section adapted to the external threaded member 130, and the external threaded member 130 is provided with an external thread, so that the external threaded member 130 can be threadedly connected to the first housing 1. And a hexagonal hole is provided in the external threaded member 130, which facilitates relevant personnel to rotate the external threaded member 130 through an external internal hexagonal wrench to adjust the pre-tightening force of the first spring 131.

[0048] One end of the first spring 131 is fixedly connected to the external threaded member 130, the other end of the first spring 131 is fixedly connected to the extrusion block 132, and one end of the extrusion block 132 away from the first spring 131 abuts against the cylindrical pin 14.

[0049] Specifically, the preset pre-tightening force of the first spring 131 is used to push the extrusion block 132 to apply a downward pressing force on the cylindrical pin 14, so that one end of the first sealing mechanism 15 is hermetically abutted against the pressure relief port 21.

[0050] As a possible case, a cap is threadedly connected to one end of the first housing 1 away from the second housing 2 for sealing the first opening, which plays a role in dust and water prevention, effectively resists the erosion of the external environment on the first spring 131 and the external threaded member 130, thereby improving the service life of the first spring 131 and the external threaded member 130, and further enhancing the reliability and stability of the entire safety cut-off valve actuator.

[0051] In an embodiment of the present utility model, as Figure 2 shown, the first sealing mechanism 15 includes a first fixing seat 150, a first bellows 151, a first base 152, a connecting block 153 and a sealing block 154.

[0052] Among them, the first fixing seat 150 is detachably connected in the second cavity 12, and a first through hole penetrating in the axial direction is opened above the first fixing seat 150. One end of the cylindrical pin 14 passes through the first through hole and abuts against the first base 152. Among them, the first fixing seat 150 can be fixedly connected to the second cavity 12 through a threaded member, and by removing the threaded member, the disassembly of the first fixing seat 150 can be realized.

[0053] One end of the first bellows 151 is sleeved and fixed on the outer wall of the first fixed seat 150, and the other end of the first bellows 151 is fixed on the outer wall of the first base 152. The first bellows 151 can be telescopically moved relative to the first fixed seat 150. The connecting block 153 is fixed on one end of the first base 152 away from the first bellows 151. One end of the sealing block 154 is fixed on the connecting block 153, and the other end of the sealing block 154 abuts against the connecting port connecting the pressure relief port 21 and the second cavity 12.

[0054] The sealing block 154 may be made of silicone or rubber, which can make the surface of the sealing block 154 fit tightly onto the pressure relief port 21 by utilizing its own elasticity and flexibility, thereby ensuring the tightness of the seal.

[0055] Specifically, the preset preload force of the first spring 131 is used to push the extrusion block 132 to apply a downward thrust to the cylindrical pin 14, so that the downward thrust is transmitted to the first base 152 through the cylindrical pin 14, thereby ensuring that the first base 152 pushes the connecting block 153 downward to drive the sealing block 154 to seal tightly against the pressure relief port 21, thereby sealing the pressure relief port 21.

[0056] If an abnormal pressure occurs at the pressure feedback port 20, the pressure will be transmitted to the second cavity 12. When the pressure fed back to the pressure feedback port 20 is greater than the set preload value of the first spring 131, the first base 152 is driven by the pressure to drive the connecting block 153 and the sealing block 154 to move away from the second shell 2, thereby releasing the blocking state of the pressure relief port 21. While the first base 152 moves, the first bellows 151 will be squeezed to cause the first bellows 151 to contract to absorb the moving distance of the first base 152, which does not affect the mobility of the first base 152 and can achieve the blocking of the connection between the second cavity 12 and the first cavity 10, greatly improving the timeliness and smoothness of the operation of the first blocking mechanism 15, avoiding the occurrence of jamming, and ensuring the reliability and rapidity of the operation of the safety shut-off valve commander.

[0057] As a possible scenario, refer to Figure 2 In order to improve the sealing between the sealing block 154 and the pressure relief port 21, a recessed groove matched with the connecting block 153 can also be provided on the second shell 2, so that one end of the connecting block 153 is plugged into the recessed groove, and a boss is provided at the pressure relief port 21 in the recessed groove. Therefore, when the sealing block 154 is subjected to pressure, due to the presence of the boss, local pressure will be formed on the contact surface between it and the sealing block 154. This local pressure helps to press the sealing block 154 more tightly against the boss, further reducing the possibility of leakage.

[0058] In one embodiment of the present invention, Figure 1As shown, one end of the extrusion block 132 and the first base 152 adjacent to the cylindrical pin 14 are respectively provided with limiting grooves (not marked in the figure) adapted to the shape of the cylindrical pin 14, and both ends of the cylindrical pin 14 are respectively abutted in the corresponding limiting grooves.

[0059] It can be understood that by setting the limiting grooves, the cylindrical pin 14 can be limited, thereby improving the stability of the cylindrical pin 14 between the extrusion block 132 and the first base 152, and avoiding the situation of the cylindrical pin 14 shifting during movement. For example, if the top of the cylindrical pin 14 is hemispherical, the limiting groove is hemispherical, so as to limit the cylindrical pin 14.

[0060] In an embodiment of the present utility model, as Figure 3 shown, the second blocking mechanism 23 includes a second fixed seat 230, a second bellows 231, a second base 232, a striker 233, a second spring 234 and a first external thread sleeve 235.

[0061] Among them, the second fixed seat 230 is fixed in the third cavity 22, and the second fixed seat 230 is provided with a connection port communicating with the second bellows 231, and the connection port is communicated with the pressure relief port 21. One end of the second bellows 231 is fixed on the outer wall of the second fixed seat 230, and the other end of the second bellows 231 is fixed on the outer wall of the second base 232, and the second base 232 can move relative to the second fixed seat 230. One end of the first external thread sleeve 235 is arranged in the third cavity 22, and the other end of the first external thread sleeve 235 is arranged in the truncation assembly 3. The striker 233 is slidably connected in the first external thread sleeve 235, and one end of the striker 233 is fixedly connected with the second fixed seat 230.

[0062] Specifically, when the pressure in the second cavity 12 enters the third cavity 22, as the pressure in the third cavity 22 increases, the gas will enter the first external thread sleeve 235 through the connection port and push the second base 232 to move. While the second base 232 is moving, it can push the striker 233 to move axially to control the opening of the truncation assembly 3. The second bellows 231 neither affects the movement of the second base 232 nor can cooperate with the second base 232 to realize the sealing of the pressure in the pressure relief port 21, and is not affected by the low-temperature environment, ensuring the smoothness of controlling the opening of the truncation assembly 3. When the safety cut-off valve actuator is reset, the pressure in the pressure feedback port 20 decreases, and at the same time the sealing head is opened, so that the pressure in the pressure relief port 21 is emptied. The elastic potential energy generated by the extrusion deformation of the second spring 234 before will push the second base 232 to drive the striker 233 to return to the initial position.

[0063] As a possible situation, in order to improve the sealing performance between the second fixing base 230 and the third cavity 22, a sealing ring may be provided on the second fixing base 230 to prevent the pressure in the pressure relief port 21 from leaking when the pressure in the pressure feedback port 20 is abnormal.

[0064] In an embodiment of the present utility model, as shown in Figure 1 , Figure 4 and Figure 5 , the truncation assembly 3 includes a third housing 30, an upper cover 31, a limiting mechanism 32, a pull rod 33, a truncation mechanism 34, a first reset mechanism 35, a manual cutting mechanism 36 and a second reset mechanism 37.

[0065] Among them, the third housing 30 is arranged on one side of the second housing 2, and a second opening is formed in the third housing 30, and an upper cover 31 is detachably connected to the second opening. One end of the first external thread sleeve 235 away from the second housing 2 is arranged in the third housing 30. A fourth cavity 300 and a stepped hole 301 are formed in the third housing 30, and the fourth cavity 300 and the stepped hole 301 are respectively communicated. Among them, the detachable design of the upper cover 31 facilitates the maintenance of the components inside the fourth cavity 300.

[0066] The limiting mechanism 32 is arranged in the fourth cavity 300, and one end of the striker 233 away from the second fixing base 230 abuts against the limiting mechanism 32. The pull rod 33 passes through the limiting mechanism 32, and the pull rod 33 can move longitudinally relative to the limiting mechanism 32. One end of the pull rod 33 is threadedly connected to the first reset mechanism 35, and the other end of the pull rod 33 passes through the stepped hole 301 and is threadedly connected to the truncation mechanism 34. The truncation mechanism 34 includes a third spring 340 and a weight 341. Among them, one end of the third spring 340 is fixed in the stepped hole 301, and the other end of the third spring 340 is fixedly connected to the weight 341. The first reset mechanism 35 is threadedly connected to the upper cover 31. The manual cutting mechanism 36 and the second reset mechanism 37 are respectively arranged on the third housing 30, and the moving end of the manual cutting mechanism 36 can abut against the limiting mechanism 32, and the moving end of the second reset mechanism 37 abuts against the limiting mechanism 32.

[0067] Specifically, when the pressure in the pressure relief port 21 is abnormal, the second base 232 is pushed by the pressure to move the striker 233 in the direction close to the limiting mechanism 32, pushing the limiting mechanism 32 to release the restraining force on the pull rod 33. At this time, under the action of the third spring 340, the weight 341 is pushed to drive the pull rod 33 to move downward to perform the overpressure cutting action, and the truncation assembly 3 is opened, causing the valve to close.

[0068] If it is necessary to control the reset of the truncation component 3, first reduce the pressure at the pressure feedback port 20, and then pull the pull rod 33 upward by controlling the first reset mechanism 35. At the same time, under the action of the second reset mechanism 37, the limit mechanism 32 is pushed back to the initial position. At this time, the limit mechanism 32 resumes its ability to limit the pull rod 33, that is, the height position of the pull rod 33 is fixed, and the weight 341 is lifted and fixed. At this time, the valve is in the open state.

[0069] If the second blocking mechanism 23 has a problem, the manual cut-off mechanism 36 can be manually controlled to drive the limit mechanism 32 to rotate, release the limit on the pull rod 33, and make the weight 341 descend to perform the overpressure cut-off action.

[0070] In an embodiment of the present invention, as Figure 1 、 Figure 4 and Figure 5 shown, the limit mechanism 32 includes a runner 320, a support frame 321 and a ball 322.

[0071] Among them, the support frame 321 is arranged in the fourth cavity 300, and a plurality of second through holes are formed in the support frame 321. A ball 322 is arranged in each second through hole, and the ball 322 is simultaneously clamped in an annular groove formed on the outer wall of the pull rod 33 to limit the position of the pull rod 33. The runner 320 is rotatably connected to the outer wall of the support frame 321, and a plurality of grooves are formed in the inner wall of the runner 320. When the runner 320 is in the cut-off state, the grooves communicate with the corresponding second through holes. When the runner 320 is in the reset state, the grooves are misaligned with the corresponding second through holes.

[0072] Specifically, when the pressure in the pressure feedback port 20 is abnormal, it will cause the ejector pin 233 to axially move away from the second housing 2 to push the runner 320 to rotate by a preset angle. When the runner 320 rotates to the limit position, the grooves communicate with the corresponding second through holes, increasing the rolling space of the ball 322. At the same time, under the action of the third spring 340, a downward trend will be generated on the pull rod 33, causing the ball 322 to jump out of the groove and enter the groove, thereby releasing the limiting force of the ball 322 on the pull rod 33, and the pull rod 33 moves downward.

[0073] When the pressure in the pressure feedback port 20 is normal, the first reset mechanism 35 pulls the pull rod 33 upward by a preset distance, so that the height of the groove is the same as that of the ball 322. At the same time, the striker 233 retracts under the action of the second spring 234, releasing the driving force on the runner 320. And at the same time, under the action of the second reset mechanism 37, the runner 320 will return to its initial position. During the rotation of the runner 320, the ball 322 will be pushed out of the groove, so that the ball 322 enters the groove. At this time, the groove is misaligned with the second through hole, and a part of the ball 322 is in the groove, and the other remaining part of the ball 322 is in the second through hole, realizing the position fixation of the pull rod 33.

[0074] In an embodiment of the present invention, as Figure 1 shown, the first reset mechanism 35 includes a support 350, a rack 351 and a wrench 352.

[0075] Among them, the support 350 is threadedly connected to the upper cover 31. A guiding hole axially penetrating the support 350 is provided in the support 350, and a third opening 3500 is provided on the outer wall of the support 350. The rack 351 is slidably connected in the guiding hole, and one end of the rack 351 adjacent to the upper cover 31 penetrates the upper cover 31 and is threadedly connected to the pull rod 33. The wrench 352 is rotatably connected in the third opening 3500, and the wrench 352 meshes with the rack 351.

[0076] Further, in order to realize the meshing of the wrench 352 and the rack 351, a tooth groove can be provided on the rack 351, and teeth matching the tooth groove can be provided on the wrench 352.

[0077] Specifically, when it is necessary to restore the initial height of the pull rod 33, by rotating the wrench 352 downward, the wrench 352 can drive the rack 351 to move upward, thereby pulling the rack 351 back to its initial height.

[0078] In an embodiment of the present invention, as Figure 4 and Figure 5 shown, the manual cutting mechanism 36 includes a second external thread sleeve 360, a first ejector rod 361 and a button 362.

[0079] Among them, the second external thread sleeve 360 is threadedly connected to the third housing 30, and the second external thread sleeve 360 penetrates the side wall of the third housing 30. The first ejector rod 361 is slidably connected in the smooth hole of the second external thread sleeve 360, and one end of the first ejector rod 361 can abut against the runner 320. The button 362 is fixed on the first ejector rod 361.

[0080] Specifically, when a problem occurs with the second blocking mechanism 23, relevant personnel can press the button 362, causing the button 362 to push the first ejector rod 361 to slide in the second external thread sleeve 360, so that the first ejector rod 361 pushes the runner 320 to rotate, thereby realizing the process of manual operation for cutting off.

[0081] In an embodiment of the present utility model, as Figure 4 and Figure 5 shown, the second reset mechanism 37 includes a guide sleeve 370, a fourth spring 371, a plug 372 and a second ejector rod 373.

[0082] Among them, the guide sleeve 370 is fixed on the third housing 30, and one end of the guide sleeve 370 communicates with the fourth cavity 300. The guide sleeve 370 is slidably connected with the second ejector rod 373, and one end of the second ejector rod 373 penetrates through the guide sleeve 370 and abuts against the runner 320. One end of the fourth spring 371 is fixedly connected with the second ejector rod 373, and the other end of the fourth spring 371 abuts against the plug 372. The plug 372 is threadedly connected in the guide sleeve 370. Among them, by rotating the plug 372, the pre-tightening force of the fourth spring 371 on the second ejector rod 373 can be adjusted.

[0083] Specifically, when the pressure in the pressure feedback port 20 is normal, the external thrust applied to the striker 233 is automatically released. Subsequently, the striker 233 retracts under the elastic force of the second spring 234, releasing the driving force on the runner 320. At this time, the elastic potential energy generated by the compressed fourth spring 371 is released, and this force will push the second ejector rod 373 to push the runner 320 back to its initial position.

[0084] In summary, the safety cut-off valve controller of the embodiment of the present utility model can reduce the influence of the movement frequency and low-temperature environment, and has a rapid response, thereby improving the stability and reliability of overpressure cut-off.

[0085] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0086] The above are only specific embodiments of the present utility model, enabling those skilled in the art to understand or implement the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments described herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A safety shut-off valve pilot, characterized in that: include: A first shell, wherein the first shell is provided with a first cavity, a connecting channel and a second cavity in sequence from top to bottom, and the connecting channel is used to connect the first cavity and the second cavity, wherein a first elastic extrusion mechanism is provided in the first cavity, a cylindrical pin is passed through the connecting channel, one end of the cylindrical pin abuts against the first elastic extrusion mechanism, and the other end of the cylindrical pin abuts against the first blocking mechanism, one end of the first blocking mechanism is detachably connected to the second cavity, and the other end of the first blocking mechanism can be telescopically moved along the axial direction of the second cavity; a second shell, wherein the second shell is detachably connected to the first shell, and a pressure feedback port, a pressure relief port and a third cavity are provided in the second shell, wherein one end of the pressure feedback port is communicated with the second cavity, and the pressure relief port is communicated with the second cavity and the third cavity respectively, and one end of the first blocking mechanism away from the cylindrical pin can be sealingly abutted against the communication port connecting the pressure relief port and the second cavity, so as to seal the pressure fed back from the pressure feedback port to the second cavity, and a second blocking mechanism is provided in the third cavity; A cut-off assembly is arranged on one side of the second shell, one end of the second blocking mechanism is fixed in the third cavity, and the other end of the second blocking mechanism can be movably inserted into the cut-off assembly to control the opening of the cut-off assembly.

2. The safety shut-off valve pilot according to claim 1, characterized in that: The first elastic extrusion mechanism includes an external threaded member, a first spring and an extrusion block, wherein: A first opening is provided at one end of the first shell away from the second shell; The external threaded member is threadedly connected in the first housing, and the external threaded member is arranged adjacent to the first opening; One end of the first spring is fixedly connected to the external threaded member, and the other end of the first spring is fixedly connected to the extrusion block; One end of the extrusion block away from the first spring abuts against the cylindrical pin.

3. The safety shut-off valve pilot according to claim 2, characterized in that: The first blocking mechanism includes a first fixing seat, a first bellows, a first base, a connecting block and a sealing block, wherein: The first fixing seat is detachably connected to the second cavity, and a first through hole penetrating in the axial direction is provided above the first fixing seat, and one end of the cylindrical pin is passed through the first through hole and contacts the first base; One end of the first bellows is sleeved and fixed on the outer wall of the first fixing seat, and the other end of the first bellows is fixed on the outer wall of the first base; The connecting block is fixed on an end of the first base away from the first corrugated pipe; One end of the sealing block is fixed on the connecting block, and the other end of the sealing block abuts against a communication port connecting the pressure relief port and the second cavity.

4. The safety shut-off valve pilot according to claim 3, characterized in that: The extrusion block and the first base are respectively provided with limiting grooves matching the shape of the cylindrical pin at one end adjacent to the cylindrical pin, and the two ends of the cylindrical pin are respectively abutted in the corresponding limiting grooves.

5. The safety shut-off valve pilot according to claim 1, characterized in that: The second blocking mechanism includes a second fixing seat, a second bellows, a second base, a striker, a second spring and a first external threaded sleeve, wherein: The second fixing seat is fixed in the third cavity, and the second fixing seat is provided with a connection port communicating with the second bellows, and the connection port is communicated with the pressure relief port; One end of the second bellows is fixed to the outer wall of the second fixing seat, and the other end of the second bellows is fixed to the outer wall of the second base, and the second base can move relative to the second fixing seat; One end of the first external thread sleeve is arranged in the third cavity, and the other end of the first external thread sleeve is arranged in the cut-off assembly; The striker is slidably connected in the first external threaded sleeve, and one end of the striker is fixedly connected to the second fixing seat.

6. The safety shut-off valve pilot according to claim 5, characterized in that: The cut-off assembly includes a third housing, an upper cover, a limit mechanism, a pull rod, a cut-off mechanism, a first reset mechanism, a manual cut-off mechanism, and a second reset mechanism, wherein: The third shell is arranged on one side of the second shell, and a second opening is provided on the third shell, and an upper cover is detachably connected to the second opening, an end of the first external threaded sleeve away from the second shell is arranged in the third shell, a fourth cavity and a stepped hole are provided in the third shell, and the fourth cavity is communicated with the stepped hole respectively; The limiting mechanism is arranged in the fourth cavity, and one end of the striker away from the second fixing seat abuts against the limiting mechanism; The pull rod is inserted into the limiting mechanism and can move longitudinally relative to the limiting mechanism. One end of the pull rod is threadedly connected to the first reset mechanism, and the other end of the pull rod passes through the stepped hole and is threadedly connected to the cut-off mechanism. The cut-off mechanism comprises a third spring and a weight, wherein one end of the third spring is fixed in the stepped hole, and the other end of the third spring is fixedly connected to the weight; The first reset mechanism is threadedly connected to the upper cover; The manual cutting mechanism and the second resetting mechanism are respectively arranged on the third housing, and the moving end of the manual cutting mechanism can conflict with the limiting mechanism, and the moving end of the second resetting mechanism conflicts with the limiting mechanism.

7. The safety shut-off valve pilot according to claim 6, characterized in that: The limiting mechanism includes a rotating wheel, a supporting frame and a ball, wherein: The support frame is arranged in the fourth cavity, and a plurality of second through holes are opened on the support frame, and a ball is arranged in each of the second through holes, and the ball is simultaneously clamped in an annular groove opened on the outer wall of the pull rod to limit the position of the pull rod; The rotating wheel is rotatably connected to the outer wall of the support frame, and a plurality of grooves are provided on the inner wall of the rotating wheel. When the rotating wheel is in a cut-off state, the grooves are communicated with the corresponding second through holes. When the rotating wheel is in a reset state, the grooves are staggered with the corresponding second through holes.

8. The safety shut-off valve pilot according to claim 6, characterized in that: The first reset mechanism includes a support, a gear rod and a wrench, wherein: The support is threadedly connected to the upper cover, a guide hole is provided in the support and passes through the support axially, and a third opening is provided on the outer wall of the support; The gear rod is slidably connected in the guide hole, and one end of the gear rod adjacent to the upper cover passes through the upper cover and is threadedly connected to the pull rod; The wrench is rotatably connected in the third opening, and the wrench is meshed with the gear rod.

9. The safety shut-off valve pilot according to claim 7, characterized in that: The manual cutting mechanism comprises a second external thread sleeve, a first push rod and a button, wherein: The second external thread sleeve is threadedly connected to the third shell, and the second external thread sleeve passes through the side wall of the third shell; The first push rod is slidably connected to the light hole of the second external threaded sleeve, and one end of the first push rod can abut against the rotating wheel; The button is fixed on the first push rod.

10. The safety shut-off valve pilot according to claim 7, characterized in that: The second reset mechanism includes a guide sleeve, a fourth spring, a plug and a second push rod, wherein: The guide sleeve is fixed on the third housing, and one end of the guide sleeve is communicated with the fourth cavity, and the guide sleeve is slidably connected to the second push rod, and one end of the second push rod passes through the guide sleeve and abuts against the rotating wheel; One end of the fourth spring is fixedly connected to the second push rod, and the other end of the fourth spring is in contact with the plug; The plug is threadedly connected in the guide sleeve.

Images