An over-pressure and under-pressure triggering mechanism for an emergency shut-off valve

Abstract

The present invention belongs to the technical field of cut-off valves, and specifically is an over-pressure and under-pressure trigger mechanism of an emergency cut-off valve, comprising a pressure cover and a sliding sleeve slidably inserted in the pressure cover, a transmission shaft is inserted on the pressure cover, the transmission shaft slides through the sliding sleeve, and the three are coaxial, a booster unit is provided on the transmission shaft and is in sliding contact with the inner wall of the sliding sleeve, and an oil storage unit is provided on the inner wall of the sliding sleeve, the booster unit comprises two elastic parts one and one opposite to each other arranged on the transmission shaft and a booster rod one and one respectively arranged on each elastic part one, the booster rod is in sliding contact with the inner wall of the sliding sleeve, the oil storage unit is used for releasing lubricating oil to the sliding connection between the pressure cover and the sliding sleeve and to the sliding connection between the sliding sleeve and the transmission shaft after the booster rod slides to contact therewith, and is also used for reversely pushing the booster rod and the transmission shaft to make the two slide along the triggering direction, the present invention has a simple structure, and is mainly used for improving the sensitivity of the transmission shaft trigger sliding in the trigger mechanism.

Description

Technical Field

[0001] The invention belongs to the technical field of cut-off valves, and in particular is an over-pressure or under-pressure triggering mechanism for an emergency cut-off valve. Background Art

[0002] In some industries or transportation operations, the emergency shut-off valve is an essential structure that triggers safety measures in an emergency. It plays a vital role in the entire process of safe operation. The emergency shut-off valve is equipped with an energy storage spring inside. When the pressure of the fluid in the pipeline conveying the fluid is abnormal (usually the fluid pressure in the pipeline is higher or lower than the set pressure range, and when it is seriously lower than the set pressure range, it is also called over-pressure), the energy storage spring will push the shaft in the emergency shut-off valve to slide linearly, and then the shaft will drive the actuator to close the valve body. After detecting that the pressure of the conveyed fluid is adjusted to the set pressure range, the shaft is driven to slide again under the action of external force to reset to the initial state of normal operation.

[0003] At present, some trigger structures have been developed, such as the patent document disclosed with the publication (publication) number "CN216519950U" and the name "A trigger mechanism for an emergency shut-off valve". The document mainly includes a gland, a transmission shaft inserted on the gland, a steel ball seat, a fixed seat, a steel ball and a sliding sleeve. The steel ball seat and the fixed seat are both cylindrical structures and are fixedly connected. The sliding sleeve is arranged on the steel ball seat, and the sliding sleeve is slidably inserted in the gland. An arc surface is provided on the circumferential outer wall of the transmission shaft, and an oblique surface is provided on the circumferential inner wall of the sliding sleeve. The steel ball is abutted and installed between the arc surface of the transmission shaft and the oblique surface of the sliding sleeve, and a first spring that is always abutted against the steel ball is sleeved on the transmission shaft.

[0004] When the pressure value during the operation is higher than the set value range or lower than the set value range, the energy storage spring will push the transmission shaft to slide. At this time, the transmission shaft slides relative to the steel ball, and the steel ball will be passively squeezed by the arc surface of the transmission shaft. As a result, the steel ball will roll along the arc surface and the beveled surface of the sliding sleeve to the standard section position between the transmission shaft and the sliding sleeve. The standard section here refers to the shaft end of the transmission shaft without the arc surface and the sleeve section of the sliding sleeve without the beveled surface. After the transmission shaft slides, it will push the actuator to close the valve body;

[0005] When the emergency situation is relieved and the operating pressure value is adjusted to within the set pressure value range, the external actuator will push the transmission shaft. At this time, the transmission shaft slides relative to the steel ball again. Then, under the pushing action of the first spring, the steel ball can be squeezed by the first spring and roll from between the standard section of the transmission shaft and the standard section of the sliding sleeve to between the arc surface of the transmission shaft and the beveled surface of the sliding sleeve, thereby completing the sliding reset of the transmission shaft.

[0006] However, when the actual action is triggered, the transmission shaft is only pushed by the energy storage spring in an emergency state. The length of the energy storage spring increases during the pushing process, and the stored elastic potential energy gradually decreases, thereby gradually reducing the pushing force on the transmission shaft, which obviously affects the sliding sensitivity of the transmission shaft, or significantly weakens the pushing force on the transmission shaft, causing the sensitivity of the triggering action of the sliding of the transmission shaft to be weakened. Summary of the invention

[0007] In view of the above problems, the present invention provides an over-pressure and under-pressure triggering mechanism for an emergency shut-off valve.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] An over-pressure and under-pressure trigger mechanism for an emergency shut-off valve comprises a gland and a sleeve slidably inserted into the gland, a transmission shaft is fixedly inserted into the gland, the transmission shaft slides through the sleeve, and the three are coaxial, a booster unit is provided on the transmission shaft and is in sliding contact with the inner wall of the sleeve, and an oil storage unit is provided on the inner wall of the sleeve, the booster unit comprises two elastic members arranged on the transmission shaft and opposite to each other and a booster rod respectively arranged on each elastic member, the booster rod is in sliding contact with the inner wall of the sleeve, the oil storage unit is used for releasing lubricating oil to the sliding connection between the gland and the sleeve and to the sliding connection between the sleeve and the transmission shaft after the booster rod slides to contact therewith, and is also used for reversely pushing the booster rod and the transmission shaft to make them slide along the triggering direction.

[0010] During the operation process, when the pressure value is higher than the set value range or lower than the set value range, the external energy storage spring will push the transmission shaft, and the transmission shaft will slide along the triggering direction. At this time, the transmission shaft drives the booster unit to slide synchronously. When the booster rod in the booster unit slides to abut against the oil storage unit, the booster rod will push the oil storage unit under the push of the elastic member 1, and then the oil storage unit can not only release lubricating oil to the sliding connection between the pressure cover and the sliding sleeve, but also release lubricating oil to the sliding connection between the sliding sleeve and the transmission shaft. Under the reaction force of the oil storage unit on the booster rod, the oil storage unit can push the booster rod through the reaction force, so that the booster rod and the transmission shaft slide along the triggering direction.

[0011] When the pressure value is adjusted back to the set pressure value range, the external actuator will push the transmission shaft to the initial position.

[0012] This structure first releases lubricating oil to the sliding connection between the gland and the sleeve through the oil storage unit, and can also release lubricating oil to the sliding connection between the sleeve and the transmission shaft. This method can further reduce the relative sliding friction between the transmission shaft and the sleeve, and reduces the sliding friction between the gland and the sleeve, thereby improving the sliding sensitivity of the transmission shaft.

[0013] At the same time, the oil storage unit will react on the booster rod under the pushing action of the booster rod, thereby further promoting the transmission shaft and the booster rod to slide along the triggering direction.

[0014] Therefore, when the stored potential energy of the energy storage spring pushing the transmission shaft is weakened, the problems in the background technology are solved simultaneously in two ways. The first way is to weaken the sliding friction of the transmission shaft during the sliding process, and the second way is to assist through the reaction force to push the transmission shaft to slide along the triggering direction, thereby effectively improving the sensitivity of the transmission shaft during the sliding process, thereby shortening the emergency cutting time, and being more conducive to avoiding the occurrence of problems and disasters and ensuring the safety of the operation process.

[0015] Preferably, the oil storage unit includes two opposite oil storage chambers opened on the inner wall of the sleeve and a wedge-shaped slider slidingly arranged in each oil storage chamber. The oil storage chamber extends to the sliding connection between the pressure cover and the sleeve and to the sliding connection between the sleeve and the transmission shaft in the form of a channel. The lubricating oil is filled in the oil storage chamber, and the two wedge-shaped sliders correspond one by one to the two booster rods.

[0016] Preferably, a second elastic member is provided in the oil storage cavity, and the second elastic member is fixedly connected to the wedge-shaped slider in the corresponding oil storage cavity, and the expansion and contraction direction of the second elastic member is parallel to the sliding direction of the wedge-shaped slider.

[0017] Preferably, balls are embedded in the ends of the two booster rods, and the balls are in rolling contact with the inner wall of the sliding sleeve.

[0018] Preferably, the inner wall of the sliding sleeve is provided with limiting grooves corresponding to and matching the two ball bearings one by one, and the two limiting grooves are corresponding to and close to the two wedge-shaped sliding blocks.

[0019] Preferably, two guide channels 1 corresponding to and communicating with the two limit groove walls are opened on the inner wall of the sliding sleeve, and guide channels 2 communicating with the corresponding oil storage chambers are opened in the two wedge-shaped sliding blocks.

[0020] Preferably, a guide groove is provided on both sides of the transmission shaft along its radial direction, the two elastic members are respectively arranged in the two guide grooves, the two booster rods are correspondingly slidably arranged in the two guide grooves, and the ends of the booster rods extend out of the guide grooves and slide in contact with the inner wall of the sleeve.

[0021] Preferably, the oil storage chamber has an arc-shaped transition at a turning point near the ball, and the turning point of the end of the booster rod with the ball has an arc-shaped transition.

[0022] Preferably, two oil injection holes are provided on the inner wall of the sliding sleeve, the two oil injection holes correspond to the two oil storage chambers one by one and are connected, and a plugging member is detachably installed in the oil injection hole.

[0023] Preferably, the inner wall of the oil filling hole is a threaded hole structure opened with threads, and the blocking piece is a threaded column structure adapted to the corresponding oil filling hole, and the two are threadedly connected.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention provides a boosting unit and an oil storage unit. When the external energy storage spring pushes the transmission shaft, the transmission shaft starts to slide along the triggering direction, and drives the boosting unit to move synchronously during the sliding process. When the boosting unit slides to abut against the oil storage unit, the boosting unit will squeeze and push the oil storage unit. Then, under the action of pressure, the oil storage unit starts to release lubricating oil to the sliding connection between the gland and the sliding sleeve, and at the same time releases lubricating oil to the sliding connection between the sliding sleeve and the transmission shaft.

[0026] In this state, the oil storage unit will react to push the booster rod, so that the booster rod and the transmission shaft will slide further along the triggering direction.

[0027] By carrying out the above two methods simultaneously, the sliding friction generated by the transmission shaft and other structures during the sliding process can be effectively reduced, and the transmission shaft can further slide along the triggering direction under the push of the reaction force, thereby effectively improving the sliding sensitivity of the transmission shaft, further reducing the trigger execution time, and greatly improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the external overall structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the cutaway structure of the present invention;

[0030] Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure of the local structure at A in the middle;

[0031] Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure of the local structure at B in the middle;

[0032] Figure 5 It is a partial structural schematic diagram of the sliding sleeve of the present invention where it is installed in cooperation with the transmission shaft;

[0033] Figure 6 It is a schematic diagram of the shape outline of the sliding sleeve of the present invention.

[0034] In the figure: 1, pressure cover, 2, sliding sleeve, 3, transmission shaft, 4, elastic member 1, 5, booster rod, 6, oil storage chamber, 7, wedge-shaped slider, 8, lubricating oil, 9, elastic member 2, 10, ball bearing, 11, limit groove, 12, guide channel 1, 13, guide channel 2, 14, guide groove, 15, oil filling hole, 16, blocking member. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figure 1 and Figure 2 As shown, an over-pressure and under-pressure trigger mechanism of an emergency shut-off valve comprises a gland 1 and a sleeve 2 slidably inserted in the gland 1, a transmission shaft 3 is fixedly inserted on the gland 1, the transmission shaft 3 slides through the sleeve 2, and the three are coaxial, a booster unit is provided on the transmission shaft 3 and is in sliding contact with the inner wall of the sleeve 2, and an oil storage unit is provided on the inner wall of the sleeve 2, the booster unit comprises two elastic members 4 arranged on the transmission shaft 3 and opposite to each other and a booster rod 5 respectively arranged on each elastic member 4, the booster rod 5 is perpendicular to the transmission shaft 3, the booster rod 5 is in sliding contact with the inner wall of the sleeve 2, the oil storage unit is used for releasing lubricating oil 8 to the sliding connection between the gland 1 and the sleeve 2 and to the sliding connection between the sleeve 2 and the transmission shaft 3 after the booster rod 5 slides to contact therewith, and is also used for pushing the booster rod 5 and the transmission shaft 3 back to make them slide along the triggering direction, and the elastic member 4 is a spring structure.

[0037] When the pressure value during the operation is higher than the set value range or lower than the set value range, the energy storage spring will push the transmission shaft 3, and the transmission shaft 3 will drive the booster rod 5 to slide during the sliding process. The booster rod 5 will slide along the inner wall of the sleeve 2, and will abut against the oil storage unit during the sliding process. At this time, the elastic member 4 pushes the booster rod 5, and then the booster rod 5 pushes the oil storage unit, and then the oil storage unit begins to release lubricating oil 8 to the sliding connection between the gland 1 and the sleeve 2 under the extrusion state, and at the same time releases lubricating oil 8 to the sliding connection between the transmission shaft 3 and the sleeve 2. At the same time, under the reverse push of the reaction force, the oil storage unit will also push the booster rod 5 in the reverse direction, thereby generating a component force on the booster rod 5 in the direction of triggering the sliding of the transmission shaft 3, which will push the booster rod 5 and the transmission shaft 3 to slide in the triggering direction. When the booster transmission shaft 3 is subjected to the same thrust of the energy storage spring, it can further inject thrust to slide in the triggering direction, thereby improving the sensitivity and speed of the transmission shaft 3 sliding in the triggering direction, and further ensuring the safety of production and operation.

[0038] Reference Figure 2 and Figure 3 As shown, the oil storage unit includes two opposite oil storage chambers 6 opened on the inner wall of the sleeve 2 and a wedge-shaped slider 7 slidably arranged in each oil storage chamber 6. The oil storage chamber 6 extends to the sliding connection between the gland 1 and the sleeve 2 and to the sliding connection between the sleeve 2 and the transmission shaft 3 in the form of a channel. The lubricating oil 8 is filled in the oil storage chamber 6. The two wedge-shaped sliders 7 correspond to the two booster rods 5 one by one. Figure 6 As shown, when the oil storage cavity 6 extends to the sliding connection between the gland 1 and the sleeve 2, a plurality of oil outlets are evenly distributed on the outer wall of the sleeve 2 in the circumferential direction. This method enables the lubricating oil 8 in the oil storage cavity 6 to be evenly lubricated to the connection between the gland 1 and the sleeve 2 in a short time, and the lubrication effect is better. Figure 5 As shown, similarly, when the oil storage chamber 6 extends to the sliding connection between the sleeve 2 and the transmission shaft 3, a plurality of oil outlets are evenly distributed on the inner wall of the sleeve 2, so that the lubricating oil 8 can be fully filled in the connection between the sleeve 2 and the transmission shaft 3, thereby improving the sliding sensitivity of the sliding between the sleeve 2 and the transmission shaft 3.

[0039] Reference Figure 2 As shown, the inclined setting direction of the wedge surface of the wedge slider 7 here is just enough to make the wedge surface of the wedge slider 7 produce a component force along the sliding direction of the transmission shaft 3 on the booster rod 5 when the booster rod 5 slides to abut against the wedge slider 7, thereby pushing the booster rod 5 and the transmission shaft 3 to further slide along the triggering direction, thereby improving the sliding speed and sensitivity of the transmission shaft 3. This setting mode of the oil storage unit has a relatively simple structure. When the wedge slider 7 is pushed by the booster rod 5, the wedge slider 7 will produce a certain sliding displacement in the oil storage chamber 6, thereby being able to squeeze the lubricating oil 8, so that the lubricating oil 8 enters the sliding connection between the gland 1 and the sleeve 2, and then further lubricates the sliding connection with the lubricating oil 8, and the lubricating oil 8 flows through the oil storage chamber 6 to the sliding connection between the transmission shaft 3 and the sleeve 2 under the squeezed state, and then lubricates the sliding connection with the lubricating oil 8, thereby greatly reducing the sliding friction generated by the transmission shaft 3 with other structures during the sliding process along the triggering direction, and at the same time, improving the sliding sensitivity of the transmission shaft 3 along the triggering direction.

[0040] Reference Figure 2As shown, an elastic member 29 is provided in the oil storage chamber 6, and the elastic member 29 is a spring structure. The elastic member 29 is fixedly connected to the wedge-shaped slider 7 in the corresponding oil storage chamber 6, and the expansion and contraction direction of the elastic member 29 is parallel to the sliding direction of the wedge-shaped slider 7. The setting of the elastic member 29 can pull the wedge-shaped slider 7, so that the wedge-shaped slider 7 further blocks the lubricating oil 8 in the oil storage chamber 6, and can also prevent the wedge-shaped slider 7 from sliding randomly in the oil storage chamber 6 due to external force, thereby ensuring the stability of the structure and durability and practicality.

[0041] Reference Figure 2 and Figure 3 As shown, the ends of the two booster rods 5 are both embedded with balls 10, which roll against the inner wall of the sleeve 2. By installing the balls 10, the booster rods 5 are indirectly connected to the inner wall of the sleeve 2 in a sliding manner. This arrangement can effectively reduce the sliding friction of the booster rods 5 when they slide along the inner wall of the sleeve 2, converting the sliding friction into rolling friction, thereby reducing the frictional resistance of the transmission shaft 3 during sliding, and further improving the sliding sensitivity of the transmission shaft 3. Figure 4 As shown, the inner wall of the sleeve 2 is provided with a limiting groove 11 which corresponds to and matches the two balls 10 one by one, and the two limiting grooves 11 correspond to and are close to the two wedge-shaped sliders 7. When the structure is used, the actuator will push the transmission shaft 3. At this time, the transmission shaft 3 drives the booster rod 5 and the balls 10 to slide back. The balls 10 will roll through the wedge-shaped sliders 7 and continue to slide into the limiting groove 11. At this time, under the pushing action of the elastic member 4, the balls 10 can be stabilized in the limiting groove 11, thereby achieving the stability of the transmission shaft 3 at the initial position after returning to the initial position.

[0042] Reference Figure 3 and Figure 4 As shown, two guide channels 12 are formed on the inner wall of the sleeve 2, which correspond to and communicate with the groove walls of the two limiting grooves 11, and two guide channels 13 are formed in the two wedge-shaped sliders 7, which communicate with the corresponding oil storage chamber 6. When the booster rod 5 slides to push the wedge-shaped slider 7, the wedge-shaped slider 7 will move and squeeze the lubricating oil 8 in the oil storage chamber 6, and the guide channel 1 12 and the guide channel 2 13 are connected at this time, and then the lubricating oil 8 enters the groove wall of the limiting groove 11 through the connected guide channel 1 12 and the guide channel 2 13, and can lubricate the ball 10. When the ball 10 moves from a stationary state to a rolling state, it also needs to overcome the static friction between the ball 10 and the groove wall of the limiting groove 11 when the ball 10 is about to slide relative to the groove wall of the limiting groove 11, so that this method can effectively lubricate the ball 10 and further reduce the friction generated by the ball 10 and other structures during the rolling process.

[0043] From now on, when the transmission shaft 3 in the structure of the present invention slides along the triggering direction, after the transmission shaft 3 slides and abuts against the wedge-shaped slider 7, the booster rod 5 will be driven to produce the following changes and effects:

[0044] The booster rod 5 starts to push the wedge-shaped slider 7 under the pushing action of the elastic member 4, and then the wedge-shaped slider 7 slides and squeezes the lubricating oil 8 in the oil storage chamber 6. At this time, the lubricating oil 8 flows into the sliding connection between the gland 1 and the sleeve 2 in the squeezed state, and then lubricates the connection, reducing the sliding friction when the gland 1 and the sleeve 2 slide relative to each other;

[0045] At this time, the lubricating oil 8 flows into the sliding connection between the transmission shaft 3 and the sliding sleeve 2 in an extruded state, thereby lubricating the connection and reducing the friction force generated when the transmission shaft 3 slides relative to the sliding sleeve 2.

[0046] The wedge-shaped slider 7 will react on the ball 10 on the booster rod 5, thereby generating a pushing component force on the ball 10 that slides along the triggering direction of the transmission shaft 3. This component force will further push the booster rod 5 and the transmission shaft 3, making the transmission shaft 3 slide more sensitively, thereby improving the sliding efficiency of the transmission shaft 3 and further improving safety.

[0047] Reference Figure 3 and Figure 4 As shown, the wedge-shaped slider 7 enables the flow guide channel 1 12 and the flow guide channel 2 13 to be connected during the sliding process. At this time, a part of the lubricating oil 8 in the extruded state will enter the groove wall of the limiting groove 11 through the connected flow guide channel 12 and the flow guide channel 2 13, thereby further lubricating the ball 10, further reducing the rolling friction generated by the ball 10 and other structures during the rolling process, and also further reducing the friction of the transmission shaft 3 during the sliding process along the triggering direction, thereby improving the sliding sensitivity.

[0048] Reference Figure 2 As shown, a guide slot 14 is provided on both sides of the transmission shaft 3 along its radial direction, and the two elastic members 14 are respectively arranged in the two guide slots 14, and the two booster rods 5 are slidably arranged in the two guide slots 14, and the ends of the booster rods 5 extend out of the guide slots 14 and slide against the inner wall of the sliding sleeve 2. The setting of the guide slots 14 can further guide the sliding direction of the booster rods 5, so that the booster rods 5 can only slide along the direction of the guide slots 14. In this way, the wedge-shaped slider 7 generates a stable thrust component force on the booster rods 5, making the thrust effect more stable.

[0049] Reference Figure 4As shown, the oil storage chamber 6 has an arc transition at the turning point near the ball 10, and the turning point of the end of the booster rod 5 with the ball 10 has an arc transition. Here, when the ball 10 rolls through the oil storage chamber 6 at the turning point near the ball 10, the arc transition setting at the turning point can make the ball 10 roll more smoothly. In the process of returning, the ball 10 can also pass smoothly through the arc transition at the turning point of the oil storage chamber 6.

[0050] Reference Figure 1 and Figure 3 As shown, two oil filling holes 15 are provided on the inner wall of the sliding sleeve 2. The two oil filling holes 15 correspond to the two oil storage chambers 6 one by one and are connected. A plugging member 16 is detachably installed in the oil filling hole 15. As the number of times of triggering and use increases, the amount of lubricating oil 8 in the oil storage chamber 6 decreases. The reduction in the amount of oil is not only not conducive to the lubrication effect of the later extrusion and release of the lubricating oil 8, but also weakens the reaction thrust force of the wedge-shaped slider 7 on the ball 10. Therefore, by setting the oil filling hole 15 and the plugging member 16, when the oil needs to be replenished after a certain period of use, the operator can remove the plugging member 16 and replenish the lubricating oil 8 into the oil storage chamber 6 in time through the oil filling hole 15, and then plug the oil filling hole 15 with the plugging member 16. This method ensures the proper effect of the lubricating oil 8 in time. The inner wall of the oil filling hole 15 is a threaded hole structure opened in a threaded manner, and the plugging member 16 is a threaded column structure adapted to the corresponding oil filling hole 15, and the two are threadedly connected. The operator only needs to rotate to remove the sealing member 16 from the oil filling hole 15 and inject new lubricating oil 8. This disassembly method is quite quick, and the threaded setting can seal the lubricating oil 8 in the oil storage chamber 6 through the cooperation of multiple layers of threads, which is beneficial to sealing and improving the sealing performance.

[0051] Working principle:

[0052] When the pressure value is higher than the set value range or lower than the set value range during operation, the energy storage spring will push the transmission shaft 3, and the transmission shaft 3 will slide along the triggering direction. At this time, the transmission shaft 3 drives the booster rod 5 and the ball 10 to slide synchronously;

[0053] When the ball 10 rolls along the inner wall of the sleeve 2 until it abuts against the wedge-shaped slider 7, the ball 10 will push the wedge-shaped slider 7 during the rolling process, and the wedge-shaped slider 7 will squeeze the lubricating oil 8 in the corresponding oil storage chamber 6. At this time, the lubricating oil 8 flows in two parts:

[0054] When a part of the lubricating oil 8 extends through the oil storage chamber 6 in the form of a channel to the sliding connection between the gland 1 and the sliding sleeve 2, and extends through the oil storage chamber 6 to the sliding connection between the sliding sleeve 2 and the transmission shaft 3, the lubricating oil 8 lubricates the sliding connection between the gland 1 and the sliding sleeve 2, and the sliding connection between the sliding sleeve 2 and the transmission shaft 3, thereby effectively reducing the friction during the sliding process;

[0055] Another part of the lubricating oil 8 flows through another path. When the ball 10 pushes the wedge-shaped slider 7 to slide in the oil storage chamber 6, the guide channel 1 12 and the guide channel 2 13 are connected. Then, another part of the lubricating oil 8 flows to the groove wall of the limiting groove 11 through the connected guide channel 1 12 and the guide channel 2 13, thereby lubricating the ball 10, which can effectively reduce the rolling friction generated by the ball 10 and other structures when rolling.

[0056] When the pressure value is adjusted to return to the set pressure value range, the external actuator will push the transmission shaft 3 to slide in the reverse direction to the initial position. During the pushing process, the booster rod 5 will be separated from the wedge-shaped slider 7. At this time, the elastic member 2 9 will push the wedge-shaped slider 7 to slide, so that the wedge-shaped slider 7 slides to the initial position released from the booster rod 5. At this time, the guide channel 1 12 and the guide channel 2 13 are staggered, and the oil path of the lubricating oil 8 is cut off. The ball 10 will also move in the reverse direction along the wedge surface of the wedge-shaped slider 7 into the limit groove 11, and then the ball 10 is limited to the limit groove 11. At this time, the transmission shaft 3 and the sleeve 2 are in a relatively stable state, that is, the transmission shaft 3 returns to the initial position;

[0057] When the oil storage chamber 6 needs to be replenished with lubricating oil 8 in time, the operator can rotate the sealing member 16 to open the oil filling hole 15, inject new lubricating oil 8 into the oil storage chamber 6 through the oil filling hole 15, and then thread the sealing member 16 into the oil filling hole 15, thereby completing the entire operation process.

[0058] The present invention is more concerned about the effect of improving the sliding sensitivity of the transmission shaft 3 along the triggering direction during use, thereby shortening the closing action time of the valve body as much as possible. As for the sliding reset process of the transmission shaft 3, it is completed by the actuator pushing the transmission shaft 3.

[0059] It should be noted that, in this article, relational terms such as "elastic member 1", "elastic member 2", "guiding channel 1" and "guiding channel 2" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An over-pressure and under-pressure triggering mechanism for an emergency shut-off valve, characterized in that: The invention comprises a gland (1) and a sliding sleeve (2) slidably inserted into the gland (1); a transmission shaft (3) is fixedly inserted into the gland (1); the transmission shaft (3) slides through the sliding sleeve (2); and the three are coaxial; a booster unit is provided on the transmission shaft (3) and is in sliding contact with the inner wall of the sliding sleeve (2); and an oil storage unit is provided on the inner wall of the sliding sleeve (2); the booster unit comprises two elastic members (4) arranged on the transmission shaft (3) and opposite to each other, and a booster rod (5) respectively arranged on each elastic member (4); the booster rod (5) is in sliding contact with the inner wall of the sliding sleeve (2); and the oil storage unit is used to pump oil into the sliding space between the gland (1) and the sliding sleeve (2) when the booster rod (5) slides to contact with the inner wall of the sliding sleeve (2). The oil storage unit comprises two oil storage chambers (6) arranged on the inner wall of the sleeve (2) and a wedge-shaped slider (7) arranged in a sliding manner in each oil storage chamber (6). The oil storage chamber (6) extends in the form of a channel to the sliding connection between the gland (1) and the sleeve (2) and to the sliding connection between the sleeve (2) and the transmission shaft (3). The lubricating oil (8) is filled in the oil storage chamber (6). The two wedge-shaped sliders (7) are arranged one by one with the two thrust rods (5). The oil storage chamber (6) is provided with an elastic member (9) which is fixedly connected to the wedge-shaped slider (7) in the corresponding oil storage chamber (6), and the extension direction of the elastic member (9) is parallel to the sliding direction of the wedge-shaped slider (7); the ends of the two booster rods (5) are both embedded with balls (10), and the balls (10) are in rolling contact with the inner wall of the sliding sleeve (2); the inner wall of the sliding sleeve (2) is provided with a limit groove (11) which corresponds to and matches the two balls (10), and the two limit grooves (11) are close to the two wedge-shaped sliders (7) in a one-to-one manner; the inner wall of the sliding sleeve (2) is provided with two groove walls which correspond to and conduct the two limit grooves (11) in a one-to-one manner. The two wedge-shaped sliders (7) each have a guide channel (13) in communication with the corresponding oil storage chamber (6), and the guide channel (13) is used to connect with the corresponding guide channel (12) when the wedge-shaped slider (7) is pushed and slid by the ball (10); a guide groove (14) is provided on both sides of the transmission shaft (3) along its radial direction, the two elastic members (4) are respectively arranged in the two guide grooves (14), the two booster rods (5) are respectively slidably arranged in the two guide grooves (14), and the ends of the booster rods (5) extend out of the guide grooves (14) and slide against the inner wall of the sleeve (2) after sliding.

2. The over-pressure and under-pressure triggering mechanism of an emergency shut-off valve according to claim 1, characterized in that: The oil storage chamber (6) has an arc-shaped transition at a turning point near the ball (10), and the turning point of the end of the booster rod (5) with the ball (10) has an arc-shaped transition.

3. The over-pressure and under-pressure triggering mechanism of an emergency shut-off valve according to claim 1, characterized in that: Two oil injection holes (15) are provided on the inner wall of the sliding sleeve (2), the two oil injection holes (15) correspond to the two oil storage chambers (6) one by one and are connected, and a blocking member (16) is detachably installed in the oil injection hole (15).

4. The over-pressure and under-pressure triggering mechanism of an emergency shut-off valve according to claim 3 is characterized in that: The inner wall of the oil filling hole (15) is a threaded hole structure opened in a threaded manner, and the blocking member (16) is a threaded column structure adapted to the corresponding oil filling hole (15), and the two are threadedly connected.

Images