A leak-proof fluid circulation container pressure relief valve

Abstract

This application relates to the field of valve technology and discloses a leak-proof fluid circulation container pressure relief valve, including a valve body, a main valve assembly, a negative pressure energy storage mechanism, a locking mechanism, a liquid suction blocking mechanism, and a delayed unlocking mechanism. When the valve core opens the pressure relief channel, the synchronizing rod drives the piston to move, increasing the volume of the negative pressure chamber space at the bottom of the piston and storing energy in the energy storage elastic element. The locking mechanism locks the piston in the negative pressure energy storage position. After the valve core closes with the valve stem, it drives the stop block to the communication position through the valve stem side linkage structure, allowing the residual liquid at the end of the pressure relief outlet to enter the negative pressure chamber space at the bottom of the piston through the liquid suction hole and the recovery channel. After the stop block resets and blocks, the delayed unlocking mechanism releases the lock, and the energy storage elastic element drives the piston to compress the negative pressure chamber space at the bottom of the piston and discharge the residual liquid. This valve can reduce external dripping of residual liquid at the end of the pressure relief outlet after the valve core is closed.

Description

Technical Field

[0001] This application relates to the field of valve technology, specifically to a pressure relief valve for a leak-proof fluid circulation container. Background Technology

[0002] Fluid circulation containers typically require pressure relief valves during operation to open a pressure relief path when the pressure inside the container reaches the opening condition, and to reset and close the valve core after the pressure drops. These pressure relief valves generally include a valve body, a pressure relief inlet, a pressure relief outlet, a valve core, and a resilient element for actuating the valve core. When the fluid pressure increases, the valve core moves away from the valve seat or valve orifice, allowing fluid to flow from the pressure relief inlet through the pressure relief channel to the pressure relief outlet; when the fluid pressure decreases, the valve core, under the action of the resilient element, closes the pressure relief channel again.

[0003] However, after the pressure relief valve completes its depressurization and enters the closing process, residual liquid can still easily remain at the end of the pressure relief outlet. This residual liquid may adhere to the inner wall of the pressure relief outlet end, the outlet face, or a low-lying area near the outlet, and continue to drip outwards after the valve core closes. For fluid circulation containers, this leakage not only causes fluid loss but may also lead to contamination around the pressure relief outlet and affect subsequent circulation and recovery processes.

[0004] In existing technologies, some pressure relief valves incorporate a linked suction structure during the valve core reset process. This structure uses the valve core's retraction to move a piston or suction component, attempting to draw back residual liquid near the pressure relief outlet. However, this type of structure typically rigidly couples the valve core reset action with the suction action, failing to provide segmented control over when the pressure relief flow has not yet ended, when the residual liquid has not yet stabilized, and when the suction channel is connected. When the valve core is not yet close to the closed position, there may still be outflow or pressure fluctuations within the pressure relief outlet. If the suction path is connected prematurely, the main pressure relief fluid may enter the recovery path, causing premature consumption of negative pressure energy and even interference between the suction and pressure relief flows.

[0005] Therefore, how to pre-establish negative pressure conditions for residual liquid recovery during the valve core opening and depressurization stage, and how to allow residual liquid at the end of the depressurization outlet to enter the negative pressure chamber space at the bottom of the piston only after the valve core is closed, and how to release the piston to perform liquid discharge and recovery after the liquid suction path is blocked again, are problems that existing leak-proof fluid circulation container depressurization valves still need to solve. Summary of the Invention

[0006] This application discloses a leak-proof fluid circulation container pressure relief valve. During the valve core opening stroke, a synchronizing rod drives the piston to move, pre-forming a negative pressure in the negative pressure chamber and storing energy in the energy storage elastic element. A locking mechanism holds the piston in the negative pressure energy storage position. A liquid suction blocking mechanism briefly connects the pressure relief outlet end to the negative pressure chamber after the valve core is closed. A delayed unlocking mechanism releases the locking mechanism after the stop block resets and blocks, allowing the piston to compress the negative pressure chamber and discharge the residual liquid to the recovery area. This forms a leak-proof treatment chain of opening energy storage, locking and holding, final liquid suction, reset blocking, and delayed liquid discharge.

[0007] To achieve the above objectives, the technical solution of this application is as follows: A leak-proof fluid circulation container pressure relief valve includes a valve body, a main valve assembly, a negative pressure energy storage mechanism, a locking mechanism, a liquid suction shielding mechanism, and a delayed unlocking mechanism; the valve body has a pressure relief inlet and a pressure relief outlet, and a pressure relief channel is formed between the pressure relief inlet and the pressure relief outlet; the main valve assembly includes a valve core, a valve stem, and a synchronizing rod, the valve stem is movably disposed within the valve body, the valve core is coaxially fixed to the valve stem and used to open or close the pressure relief channel, the synchronizing rod is fixed to the valve stem and extends radially along the valve stem; the negative pressure energy storage mechanism includes a piston, a first connecting rod, and an energy storage elastic element, a negative pressure chamber is formed within the valve body, the piston is slidably disposed within the negative pressure chamber and connected to the first connecting rod, the synchronizing rod drives the first connecting rod and the piston to move during the valve core opening stroke, so as to increase the volume of the negative pressure chamber space on the bottom side of the piston and to allow the energy storage elastic element to store energy;

[0008] The locking mechanism is used to lock the piston in a preset negative pressure energy storage position. The liquid suction blocking mechanism includes a stop block, which is movably disposed in the valve body and has a liquid suction hole. A recovery channel is formed in the valve body, communicating with the negative pressure chamber space at the bottom of the piston. The stop block can move between the blocking position formed by blocking the liquid inlet end of the recovery channel and the communicating position formed by connecting the liquid suction hole to the liquid inlet end of the recovery channel. During the latter part of the valve core's stroke towards the position of closing the pressure relief channel, the valve core can drive the stop block to move to the communicating position, allowing the residual liquid at the end of the pressure relief outlet to enter the negative pressure chamber space at the bottom of the piston through the liquid suction hole and the recovery channel. The delayed unlocking mechanism is used to release the locking mechanism after the stop block returns to the blocking position, allowing the energy storage elastic element to drive the piston to compress the negative pressure chamber space at the bottom of the piston, and causing the residual liquid in the negative pressure chamber space to be discharged to the preset recovery area. Through this structure, the residual liquid suction action and the piston discharge action are separated in time, reducing the possibility that the residual liquid at the end of the pressure relief outlet will continue to drip after the valve core is closed.

[0009] Furthermore, a base plate and a flow plate are fixedly disposed within the valve body. The base plate is positioned near the pressure relief inlet and has a valve hole. The valve core can be positioned within the valve hole to close the pressure relief channel. The flow plate has a flow hole for fluid to pass through, and the valve stem slides through the flow plate. Thus, the valve core and the valve hole form a main pressure relief interface that can be repeatedly opened and closed, and the flow plate provides a guiding foundation for the valve stem and allows the pressure relief flow to pass through.

[0010] Furthermore, a second fixed ring is fixedly sleeved on the outer side of the valve stem, and a fourth spring is sleeved on the outer side of the valve stem. The two ends of the fourth spring are fixedly connected to the top wall of the second fixed ring and the bottom wall of the flow plate, respectively, so as to apply a reset force towards the valve orifice to the valve stem and the valve core. Through the connection relationship between the fourth spring, the second fixed ring and the flow plate, the valve core can be reset in the closing direction after the pressure on the pressure relief inlet side decreases.

[0011] Furthermore, a clearance groove is formed on the outer wall of the first connecting rod along the valve stem axial direction, and the synchronizing rod extends into the clearance groove. During the valve core opening stroke, the synchronizing rod pushes against the top of the clearance groove to drive the first connecting rod and the piston to move. During the process of the valve core moving towards the position of closing the pressure relief channel, the synchronizing rod slides relative to the piston within the clearance groove to keep the piston at the preset negative pressure energy storage position. Thus, the valve stem opening stroke can be transmitted to the piston, while the valve stem closing stroke will not directly drive the piston to reset.

[0012] Furthermore, the energy storage elastic element is a sixth spring, located between the top side of the piston and the top wall of the negative pressure chamber groove, with both ends of the sixth spring fixedly connected to the top side wall of the piston and the top wall of the negative pressure chamber groove, respectively. When the piston moves towards the top wall of the negative pressure chamber groove, the volume of the negative pressure chamber space on the bottom side of the piston increases, and the sixth spring is compressed to store energy. Through the connection between the sixth spring and the piston, the piston can complete the formation of negative pressure and elastic energy storage before being locked.

[0013] Furthermore, the locking mechanism includes a locking rod, a first fixed ring, and a third spring. The locking rod is radially movable and inserted into the inner side of the valve body. A locking hole is formed on the outer wall of the piston to engage with the locking rod. The first fixed ring is sleeved and fixed to the outer side of the locking rod. The third spring is sleeved on the outer side of the locking rod, and its two ends are respectively fixed to the ring wall of the first fixed ring and the inner wall of the valve body. The third spring is used to drive the locking rod to move toward the locking hole, so that the locking rod can be inserted into the locking hole and lock the piston. Thus, after the piston moves to the negative pressure energy storage position, the locking rod can mechanically limit the piston, keeping the negative pressure chamber in a negative pressure energy storage state.

[0014] Furthermore, a second inclined groove is provided on the locking rod. The delayed unlocking mechanism can act on the second inclined groove after the stop block returns to the blocking position, thereby driving the locking rod to move away from the piston and exit the lock hole. Thus, the unlocking action of the locking rod can be triggered by the delayed unlocking mechanism after the stop block returns to its original position.

[0015] Furthermore, a first groove is formed on the inner wall of the valve body, located near the end of the pressure relief outlet, and a stop block is slidably disposed within the first groove. A first one-way valve is provided at the inlet end of the recovery channel. The first one-way valve allows residual liquid at the end of the pressure relief outlet to enter the negative pressure chamber space at the bottom of the piston through the recovery channel, and prevents residual liquid in the negative pressure chamber space at the bottom of the piston from flowing back to the pressure relief outlet through the recovery channel. When the stop block is in the blocking position, it blocks the inlet end of the first one-way valve; when the stop block is in the communicating position, it connects the suction hole with the inlet end of the first one-way valve. By changing the position of the stop block within the first groove, a short-term suction path that can be controlled by mechanical stroke is formed between the end of the pressure relief outlet and the recovery channel.

[0016] Furthermore, a first pressure-applying block is fixedly mounted on the valve stem. The first pressure-applying block has a first inclined surface and a pressure-applying plane. A telescopic rod is fixedly connected to the side wall of the stop block. The telescopic rod extends and retracts radially along the valve stem. A pressure-bearing block is fixed to the end of the telescopic rod away from the stop block. A first spring is sleeved on the outside of the telescopic rod. The two ends of the first spring are fixedly connected to the outer wall of the stop block and the outer wall of the pressure-bearing block, respectively. The pressure-bearing block can move radially relative to the stop block along the valve stem. A pressure-bearing plane is formed on the top side of the pressure-bearing block for contacting the pressure-applying plane, and a second inclined surface is formed on one side of the bottom of the pressure-bearing block for engaging with the first inclined surface. With the cooperation of the first and second inclined surfaces, the first pressure-applying block can pass over the pressure-bearing block during the opening stroke. With the cooperation of the pressure-applying plane and the pressure-bearing plane, the first pressure-applying block can drive the pressure-bearing block and the stop block to move in the closing phase.

[0017] Furthermore, a first support arm is fixed to the inner wall of the valve body, and a first inclined groove is formed on the other side of the bottom of the pressure block. A first push rod is fixed to the top of the first support arm, and the first push rod can enter the first inclined groove and force the pressure block to avoid the valve stem radially. A second support arm is fixedly connected to the stop block, and a second connecting rod is fixedly connected to the bottom of the second support arm. The second connecting rod slides through the first support arm, and a second spring is sleeved on the outside of the second connecting rod. The two ends of the second spring are fixedly connected to the top of the first support arm and the bottom of the second support arm, respectively, to drive the stop block to return from the connected position to the blocked position. Thus, after the stop block completes short-term connection, the cooperation between the first push rod and the first inclined groove can release the continuous pressure of the first pressure block on the pressure block, and the second spring can drive the stop block to return to its original position.

[0018] Furthermore, the delayed unlocking mechanism includes a third link, a fourth link, a fifth link, a second push rod, a slider, and a fifth spring. The third link is fixed between the bottom end of the second link and the top end of the fourth link, the fifth link is fixed to the bottom end of the fourth link, the second push rod is sleeved on the bottom end of the fifth link, a second groove is formed on the inner side of the top end of the second push rod, the slider is slidably disposed in the second groove and fixedly connected to the bottom end of the fifth link, and the two ends of the fifth spring are respectively fixedly connected to the top wall of the second groove and the top wall of the slider. A second pressure block is elastically deflectable on the outer wall of the second push rod, and a receiving groove for accommodating the second pressure block is formed on the outer wall of the second push rod. The second pressure block has a pressing state that extends radially outward relative to the axis of the second push rod, and a clearance state that is stored in the receiving groove and parallel to the axis of the second push rod. Through the idle cooperation between the second groove and the slider, the stroke required for the stop block to reset and block can be absorbed first, and the effective unlocking action of the second pressure block is postponed.

[0019] Furthermore, when the second pressure block moves downward with the second push rod and passes the locking rod, it can deflect from the pressure state to the avoidance state; when the second pressure block moves upward with the second push rod, it can remain in the pressure state and slide to compress the second inclined groove to drive the locking rod to move away from the piston. Thus, the second pressure block avoids the locking rod during downward movement and acts as an unlocking pressure element on the locking rod during upward movement.

[0020] Furthermore, the slider can move from the bottom to the top of the second groove. During this movement, the suction hole is reset from its position at the inlet end of the recovery channel to a position misaligned with the inlet end of the recovery channel. This ensures that the closing process of the suction path corresponds in time to the idle process of the delayed unlocking mechanism, reducing the likelihood that the piston will begin discharging liquid before the suction hole has misaligned.

[0021] Furthermore, a reflux chamber connected to a preset recovery area is formed within the valve body. The inlet end of the reflux chamber is connected to the negative pressure chamber space on the bottom side of the piston. A second one-way valve is provided at the inlet end of the reflux chamber. The second one-way valve is used to allow residual liquid in the negative pressure chamber space on the bottom side of the piston to enter the reflux chamber and to prevent liquid in the reflux chamber from flowing back into the negative pressure chamber. By limiting the discharge direction through the second one-way valve, the residual liquid in the negative pressure chamber can be discharged along the reflux chamber when the piston compresses the negative pressure chamber.

[0022] Compared with the prior art, the beneficial effects achieved by this application are as follows:

[0023] Firstly, this application pre-creates negative pressure and stores energy through the valve core opening stroke, and briefly connects the suction hole and the recovery channel through the valve core closing section, and delays the unlocking of the piston after the stop block resets and blocks, so that the suction action and the discharge action are executed in time. As a result, the residual liquid at the end of the pressure relief outlet can first enter the negative pressure chamber space on the bottom side of the piston, and then be compressed by the piston and discharged to the recovery area, which helps to reduce external dripping after the valve core is closed.

[0024] Secondly, in this application, the first chute is located near the end of the pressure relief outlet. The baffle moves within the first chute and controls the connection or blockage of the suction path by aligning or misaligning the suction hole with the inlet end of the first one-way valve. Therefore, before the valve core enters the closed section, the baffle can block the inlet end of the first one-way valve, making it difficult for the outflow from the pressure relief outlet to enter the recovery channel prematurely. After the valve core enters the closed section, the suction hole connects with the first one-way valve, which helps to make the negative pressure chamber act on the residual liquid at the end of the pressure relief outlet.

[0025] Thirdly, in this application, the locking rod and the locking hole can engage when the piston moves to the negative pressure storage position. The third spring applies a spring force to the locking rod toward the locking hole, keeping the piston locked in the locked state before the valve core falls back. Therefore, the valve core will not directly drive the piston to reset before closing, which is beneficial to maintaining the negative pressure state of the negative pressure chamber until the residual liquid at the end of the pressure relief outlet enters the recovery channel.

[0026] Fourth, in this application, the slider can move from the bottom to the top of the second groove, and during this movement, the suction hole is reset from its position at the liquid inlet end of the recovery channel to a position misaligned with the liquid inlet end of the recovery channel; after the suction hole is misaligned, the second pressure block squeezes the second inclined groove to drive the locking rod out of the locking hole. Therefore, the liquid suction path reset and blocking and the piston unlocking and discharging are in a sequential relationship constrained by the idle stroke, which helps to reduce the situation where residual liquid in the negative pressure chamber flows back towards the pressure relief outlet during discharging. Attached Figure Description

[0027] In the attached diagram:

[0028] Figure 1 This is a cross-sectional structural diagram of the entire application in its initial state (without depressurization);

[0029] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0030] Figure 3 for Figure 1 Enlarged structural diagram at point B;

[0031] Figure 4 for Figure 1 A schematic diagram of the pressure relief channel when the valve core is closed;

[0032] Figure 5 for Figure 1 A schematic diagram of the delayed unlocking mechanism;

[0033] Figure 6 for Figure 1 Schematic diagram of the main valve assembly;

[0034] Figure 7 for Figure 1 A schematic diagram of the structure of the first pressure-applying block on the valve stem;

[0035] Figure 8 for Figure 1 A partial schematic diagram showing the second pressure block in a state of radial outward extension relative to the axis of the second push rod, and located above the locking rod;

[0036] Figure 9 This is a cross-sectional structural diagram of the entire application when the pressure relief channel is fully open.

[0037] Figure 10 for Figure 9 Enlarged structural diagram at point C;

[0038] Figure 11 for Figure 9 Enlarged structural diagram at point D;

[0039] Figure 12 This is a cross-sectional structural diagram of the entire structure in the pre-reset section after pressure relief (the pressure-applying plane of the first pressure-applying block just contacts the pressure-bearing plane of the pressure-bearing block).

[0040] Figure 13 This is a cross-sectional structural diagram of the valve core in the middle of its reset position after pressure relief (the pressure-bearing block has avoided the first pressure-applying block).

[0041] Figure 14 for Figure 12 A partial structural diagram of the second pressure block being touched by the top side opening of the second inclined groove and deflected towards the receiving groove during the process of the medium-delay unlocking mechanism moving down in conjunction with the stop block;

[0042] Figure 15 for Figure 14 A partial structural diagram showing the second pressure block in the middle completely deflected and stored in the storage groove when it moves down;

[0043] Figure 16 for Figure 15 A partial structural diagram showing the second pressure block moving down through the second inclined groove and rotating back to its initial extended state;

[0044] Figure 17 for Figure 16 A partial structural diagram showing the second pressure block moving upwards to begin contacting the bottom wall of the second inclined trough;

[0045] Figure 18 for Figure 17 A partial structural diagram showing the second pressure block being temporarily restricted by the bottom wall of the second inclined groove and not moving synchronously upward with the fifth connecting rod, and the slider moving to the top side of the second sliding groove;

[0046] Figure 19 for Figure 18 A partial structural diagram showing the second pressure block continuing to move upwards, squeezing the second inclined groove and forcing the lock rod to disengage from the lock hole.

[0047] Explanation of reference numerals in the attached figures:

[0048] 1. Valve body; 101. Pressure relief inlet; 102. Pressure relief outlet; 2. Base plate; 3. Valve hole; 4. Valve core; 5. Valve stem; 6. Flow plate; 7. Negative pressure chamber; 8. Piston; 9. First connecting rod; 10. Sixth spring; 11. Synchronizing rod; 12. Clearance groove; 13. First pressure block; 131. First inclined surface; 132. Pressure application plane; 14. Pressure bearing block; 15. Second inclined surface; 16. Telescopic rod; 17. First spring; 18. Stop block; 19. Liquid suction hole; 20. First slide groove; 21. First check valve; 22. Recovery channel; 2 3. Second one-way valve; 24. Return chamber; 25. First support arm; 26. First push rod; 27. First inclined groove; 28. Second support arm; 29. ​​Second connecting rod; 30. Second spring; 31. Third connecting rod; 32. Fourth connecting rod; 33. Fifth connecting rod; 34. Second push rod; 35. Second pressure block; 36. Receiving groove; 37. Locking rod; 38. First fixed ring; 39. Second inclined groove; 40. Third spring; 41. Lock hole; 42. Second fixed ring; 43. Fourth spring; 44. Second sliding groove; 45. Slider; 46. Fifth spring. Detailed Implementation

[0049] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present application. Unless otherwise specified, the embodiments and features described in the present application can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of the present application.

[0050] See Figures 1 to 19 For ease of description, in this embodiment, the direction in which the valve core 4 leaves the valve hole 3 is defined as the opening direction, and the direction in which the valve core 4 is situated in the valve hole 3 is defined as the closing direction; the following descriptions of upward and downward movements are based on the postures shown in the attached drawings. This embodiment provides a leak-proof fluid circulation container pressure relief valve, which includes a valve body 1, a main valve assembly, a negative pressure energy storage mechanism, a locking mechanism, a liquid suction blocking mechanism, and a delayed unlocking mechanism. The valve body 1 has a pressure relief inlet 101 and a pressure relief outlet 102, and a pressure relief channel is formed between the pressure relief inlet 101 and the pressure relief outlet 102. The pressure relief inlet 101 is used to communicate with a fluid circulation container or related fluid pipeline, and the pressure relief outlet 102 is used to discharge fluid when the valve core 4 is opened.

[0051] The main valve assembly includes a valve core 4, a valve stem 5, and a synchronizing rod 11. The valve stem 5 is movably disposed within the valve body 1. The valve core 4 is coaxially fixed to the valve stem 5 and is used to open or close the pressure relief passage. The synchronizing rod 11 is fixed to the valve stem 5 and extends radially along the valve stem 5. A base plate 2 and a flow plate 6 are fixedly disposed within the valve body 1. The base plate 2 is disposed near the pressure relief inlet 101 and has a valve hole 3. The valve core 4 can be positioned in the valve hole 3 to close the pressure relief passage. The flow plate 6 has a flow hole for fluid to pass through, and the valve stem 5 slides through the flow plate 6.

[0052] A second retaining ring 42 is fixedly sleeved on the outer side of the valve stem 5, and a fourth spring 43 is sleeved on the outer side of the valve stem 5. The two ends of the fourth spring 43 are fixedly connected to the top wall of the second retaining ring 42 and the bottom wall of the flow plate 6, respectively, to apply a reset force toward the valve hole 3 to the valve stem 5 and the valve core 4. When the pressure on the pressure relief inlet 101 side is lower than the opening condition, the valve core 4 remains seated in the valve hole 3 under the action of the fourth spring 43; when the pressure on the pressure relief inlet 101 side rises to a level that can overcome the closing force of the fourth spring 43 and the valve core 4, the valve core 4 moves away from the valve hole 3, opening the pressure relief channel between the pressure relief inlet 101 and the pressure relief outlet 102.

[0053] The negative pressure energy storage mechanism includes a piston 8, a first connecting rod 9, and an energy storage elastic element. A negative pressure chamber 7 is formed inside the valve body 1. The piston 8 is movably disposed in the negative pressure chamber 7 and connected to the first connecting rod 9. A plug sealing ring is provided on the outer periphery of the piston 8. The plug sealing ring slides and seals with the inner peripheral wall of the negative pressure chamber 7, so that the negative pressure chamber space on the bottom side of the piston 8 can form a negative pressure or be compressed as the piston 8 moves.

[0054] A clearance groove 12 is provided on the outer wall of the first connecting rod 9 along the axial direction of the valve stem 5, and the synchronizing rod 11 extends into the clearance groove 12. The synchronizing rod 11 can slide relative to the valve stem 37 within the clearance groove 12, so that the piston 8 is held in a preset negative pressure energy storage position where the locking hole 41 is opposite to the locking rod 37 and can be locked by the locking rod 37. It can also push against the top of the clearance groove 12 during the opening stroke of the valve core 4, thereby driving the first connecting rod 9 and the piston 8 to move.

[0055] A first sliding seal structure is provided at a point where the first connecting rod 9 passes through the valve body 1 and enters the negative pressure chamber 7. The first sliding seal structure may include a first guide sleeve fixed to the valve body 1 and a first sealing ring disposed on the inner wall of the first guide sleeve. The first connecting rod 9 slides through the first guide sleeve and seals with the first sealing ring. The first sealing ring may be an O-ring, a lip seal, or a combination of seals. Through this first sliding seal structure, when the first connecting rod 9 moves relative to the valve body 1, the possibility of the negative pressure chamber 7 depressurizing or drawing in external gas along the point where the first connecting rod 9 passes through is reduced, thereby allowing the negative pressure chamber 7 on the bottom side of the piston 8 to maintain a pressure differential state for drawing in residual liquid at the end of the pressure relief outlet 102.

[0056] In this embodiment, the energy storage elastic element is a sixth spring 10. The sixth spring 10 is located between the top side of the piston 8 and the top wall of the negative pressure chamber 7, and its two ends are fixedly connected to the top side wall of the piston 8 and the top wall of the negative pressure chamber 7, respectively. When the piston 8 moves towards the top wall of the negative pressure chamber 7, the volume of the negative pressure chamber 7 space on the bottom side of the piston 8 increases, and the sixth spring 10 is compressed to store energy. That is to say, in this embodiment, the negative pressure space used for liquid aspiration is located on the bottom side of the piston 8. When the piston 8 moves upward, a negative pressure is formed, and when the piston 8 subsequently returns to its original position and moves downward, this negative pressure space is compressed.

[0057] The locking mechanism is used to lock the piston 8 in a preset negative pressure energy storage position. In this embodiment, the preset negative pressure energy storage position refers to the position in which the piston 8 moves within the negative pressure chamber 7 to a position where the locking hole 41 is aligned with the locking rod 37. This position simultaneously increases the volume of the negative pressure chamber 7 on one side of the piston 8 to a level sufficient to generate a suction pressure differential for the residual liquid at the end of the pressure relief outlet 102, and puts the energy storage elastic element in an energy storage state. In other words, the preset negative pressure energy storage position is not merely an abstract position set by humans, but is jointly defined by the alignment relationship between the locking hole 41 and the locking rod 37, the movement stroke of the piston 8 within the negative pressure chamber 7, and the energy storage state of the energy storage elastic element.

[0058] Specifically, the locking mechanism includes a locking rod 37, a first retaining ring 38, a third spring 40, and a locking hole 41. The locking rod 37 is radially movable and inserted into the inner side of the valve body 1. A locking hole 41 is provided on the outer wall of the piston 8 to engage with the locking rod 37. The locking hole 41 is a radial blind hole with its opening facing the locking rod 37. The locking hole 41 does not penetrate the end face of the piston 8 used to separate the negative pressure chamber 7, and the locking hole 41 is located outside the sealing zone where the piston sealing ring is located.

[0059] The first fixed ring 38 is sleeved and fixed to the outside of the locking rod 37, and the third spring 40 is sleeved on the outside of the locking rod 37, with both ends of the third spring 40 fixed to the annular wall of the first fixed ring 38 and the inner wall of the valve body 1, respectively. The third spring 40 is used to drive the locking rod 37 to move toward the lock hole 41, so that the locking rod 37 can be inserted into the lock hole 41 and lock the piston 8.

[0060] A second sliding sealing structure is provided between the locking rod 37 and the valve body 1. Specifically, the valve body 1 may be provided with a guide hole for the locking rod 37 to slide radially. A second guide sleeve is provided in the guide hole, and a second sealing ring is provided on the inner wall of the second guide sleeve. The locking rod 37 slides through the second guide sleeve and is sealed with the second sealing ring. The second sealing ring is located between the locking rod 37 and the guide hole, and is used to reduce the leakage of fluid in the negative pressure chamber 7 through the guide hole during the insertion or withdrawal of the locking rod 37 into or out of the locking hole 41.

[0061] Furthermore, the second sliding seal structure can be configured as two sealing rings spaced apart along the axial direction of the locking rod 37, with an isolation gap between the two sealing rings. This isolation gap can serve as a sealing buffer area when the locking rod 37 reciprocates, thereby reducing the possibility of direct communication between the negative pressure chamber 7 and the outer space of the valve body 1 during the radial movement of the locking rod 37.

[0062] The locking rod 37 is also provided with a second inclined groove 39. The delayed unlocking mechanism can act on the second inclined groove 39 after the stop 18 is reset to the blocking position, so as to drive the locking rod 37 to move away from the piston 8 and exit the lock hole 41. After the locking rod 37 exits the lock hole 41, the piston 8 moves under the action of the sixth spring 10, thereby compressing the negative pressure chamber 7.

[0063] In this embodiment, the blocking position refers to the position where the block 18 moves to cover the liquid inlet end of the recovery channel 22 or the liquid inlet end of the first one-way valve 21, so that the liquid suction path between the end of the pressure relief outlet 102 and the recovery channel 22 is blocked; the connecting position refers to the position where the block 18 moves to the position where the liquid suction hole 19 corresponds to the liquid inlet end of the recovery channel 22 or the liquid inlet end of the first one-way valve 21, so that the residual liquid at the end of the pressure relief outlet 102 can enter the recovery channel 22 through the liquid suction hole 19.

[0064] The liquid suction blocking mechanism includes a stop block 18. The stop block 18 is movably disposed within the valve body 1 and has a liquid suction hole 19. A recovery channel 22 is formed within the valve body 1, communicating with the space of the negative pressure chamber 7 at the bottom of the piston 8. The stop block 18 can move between a blocking position formed by blocking the liquid inlet end of the recovery channel 22 and a communicating position formed by connecting the liquid suction hole 19 to the liquid inlet end of the recovery channel 22. Specifically, a first sliding groove 20 is formed on the inner sidewall of the valve body 1, the first sliding groove 20 being located near the end of the pressure relief outlet 102, and the stop block 18 is slidably disposed within the first sliding groove 20. A first check valve 21 is provided at the inlet end of the recovery channel 22 (the first check valve 21 is used to allow residual liquid at the end of the pressure relief outlet 102 to enter the negative pressure chamber 7 space on the bottom side of the piston 8 through the recovery channel 22, and to prevent residual liquid in the negative pressure chamber 7 space on the bottom side of the piston 8 from flowing back to the pressure relief outlet 102 through the recovery channel 22). In this embodiment, the inlet end of the first check valve 21 constitutes the inlet end of the recovery channel 22 facing the end of the pressure relief outlet 102. When the stop block 18 is in the blocking position, it blocks the inlet end of the first check valve 21; when the stop block 18 is in the communicating position, it connects the suction hole 19 with the inlet end of the first check valve 21.

[0065] A third sliding seal structure is provided between the first slide groove 20 and the stop block 18. The third sliding seal structure may include a slide groove sealing strip provided on the groove wall of the first slide groove 20, or an annular sealing ring provided on the outer peripheral wall of the stop block 18. The stop block 18 and the first slide groove 20 form a sliding seal fit through the slide groove sealing strip or the annular sealing ring, so that when the stop block 18 moves in the first slide groove 20, the fluid at the end of the pressure relief outlet 102 is not easily allowed to enter the recovery channel 22 along the fit gap between the stop block 18 and the first slide groove 20.

[0066] To improve the sealing effect of the stop block 18 on the inlet end of the first one-way valve 21 when in the blocking position, an annular sealing seat can be formed on the outer side of the inlet end of the first one-way valve 21, and a sealing blocking surface opposite to the annular sealing seat is formed on the side of the stop block 18 facing the first one-way valve 21. When the stop block 18 is in the blocking position, the sealing blocking surface covers the inlet end of the first one-way valve 21 and abuts or fits against the annular sealing seat, thereby causing the suction hole 19 to be misaligned with the inlet end of the first one-way valve 21, while the stop block 18 body forms an end face blocking effect on the inlet end of the first one-way valve 21.

[0067] In one optional embodiment, an elastic sealing gasket is provided on the sealing and blocking surface of the stop 18. This elastic sealing gasket can press against the annular sealing seat outside the inlet end of the first one-way valve 21 when the stop 18 is in the blocked position. This elastic sealing gasket can be made of media-resistant rubber, polytetrafluoroethylene (PTFE) sealing sheet, or elastic composite sealing sheet. Through the cooperation between the elastic sealing gasket and the annular sealing seat, the stop 18, when in the blocked position, can isolate the inlet end of the first one-way valve 21 from the end of the pressure relief outlet 102, reducing the possibility of the pressure relief fluid entering the recovery channel 22 under blocked conditions.

[0068] In another alternative embodiment, a limiting step is provided at the bottom or side of the first chute 20, and the stop block 18 abuts against the limiting step when it moves to the blocking position. The limiting step is used to limit the blocking position of the stop block 18, so that the suction hole 19 on the stop block 18 is misaligned with the liquid inlet end of the first one-way valve 21, and the sealing blocking surface of the stop block 18 keeps covering the liquid inlet end of the first one-way valve 21.

[0069] A first pressure-applying block 13 is fixedly mounted on the valve stem 5. The first pressure-applying block 13 has a first inclined surface 131 and a pressure-applying surface 132. A telescopic rod 16 is fixedly connected to the side wall of the stop block 18. The telescopic rod 16 is radially telescopic along the valve stem 5. A pressure-bearing block 14 is fixed to the end of the telescopic rod 16 away from the stop block 18. A first spring 17 is sleeved on the outside of the telescopic rod 16. The two ends of the first spring 17 are fixedly connected to the outer wall of the stop block 18 and the outer wall of the pressure-bearing block 14, respectively. The pressure-bearing block 14 can move radially relative to the stop block 18 along the valve stem 5. A pressure-bearing surface is formed on the top side of the pressure-bearing block 14 for contacting the pressure-applying surface 132. A second inclined surface 15 is formed on one side of the bottom of the pressure-bearing block 14 for cooperating with the first inclined surface 131.

[0070] A first support arm 25 is fixed to the inner wall of the valve body 1. A first inclined groove 27 is provided on the other side of the bottom of the pressure block 14, and a first push rod 26 is fixed to the top side of the first support arm 25. The first push rod 26 can enter the first inclined groove 27 and force the pressure block 14 to avoid the valve stem 5 radially. A second support arm 28 is fixedly connected to the stop block 18, and a second connecting rod 29 is fixedly connected to the bottom side of the second support arm 28. The second connecting rod 29 slides through the first support arm 25. A second spring 30 is sleeved on the outside of the second connecting rod 29. The two ends of the second spring 30 are fixedly connected to the top side of the first support arm 25 and the bottom side of the second support arm 28, respectively, to drive the stop block 18 to return from the communicating position to the blocking position.

[0071] The delayed unlocking mechanism includes a third link 31, a fourth link 32, a fifth link 33, a second push rod 34, a slider 45, and a fifth spring 46. The third link 31 is fixed between the bottom end of the second link 29 and the top end of the fourth link 32, and the fifth link 33 is fixed to the bottom end of the fourth link 32. The second push rod 34 is sleeved on the bottom end of the fifth link 33, and a second groove 44 is formed on the inner side of the top end of the second push rod 34. The slider 45 is slidably disposed in the second groove 44 and fixedly connected to the bottom end of the fifth link 33. The two ends of the fifth spring 46 are fixedly connected to the top wall of the second groove 44 and the top wall of the slider 45, respectively.

[0072] A second pressure block 35 is elastically deflected on the outer wall of the second push rod 34. Specifically, the second pressure block 35 is hinged to one side wall of the receiving groove 36 via a pivot. A torsion spring is provided at the pivot, which is used to drive the second pressure block 35 to reset from the avoidance state to the pressure state. A stop surface is provided in the receiving groove 36, which is used to limit the second pressure block 35 from continuing to deflect into the receiving groove 36 when it moves upward to squeeze the second inclined groove 39.

[0073] The outer wall of the second push rod 34 is provided with a receiving groove 36 for accommodating the second pressure block 35. The second pressure block 35 has a pressing state in which it extends radially outward relative to the axis of the second push rod 34, and a yielding state in which it is received in the receiving groove 36 and parallel to the axis of the second push rod 34. When the second pressure block 35 moves downward with the second push rod 34 and passes the locking rod 37, it can deflect from the pressing state to the yielding state; when the second pressure block 35 moves upward with the second push rod 34, it can remain in the pressing state and slide to compress the second inclined groove 39 to drive the locking rod 37 to move away from the piston 8.

[0074] The slider 45 can move from the bottom to the top of the second groove 44. During the movement of the slider 45 from the bottom to the top of the groove, the suction hole 19 is reset from the position connecting to the inlet end of the recovery channel 22 to a position misaligned with the inlet end of the recovery channel 22. Thus, the idle stroke of the second groove 44 and the slider 45 covers the stroke required for the stop block 18 to reset, preventing the piston 8 from being unlocked before the suction hole 19 is misaligned.

[0075] In this embodiment, the period during which the slider 45 moves from the bottom to the top of the second groove 44 refers to the stage where the fifth connecting rod 33 moves relative to the second push rod 34, but the second push rod 34 has not yet converted this movement into an effective unlocking displacement of the second pressure block 35 on the locking rod 37. This stage is the idle stage of the delayed unlocking mechanism. The stroke length of this idle stage is defined by the distance from the bottom to the top of the second groove 44 and matches the stroke required for the stop block 18 to drive the suction hole 19 to reset from the communicating position to the blocked position.

[0076] A reflux chamber 24, which connects to a preset recovery area, is formed inside the valve body 1. The inlet end of the reflux chamber 24 connects to the negative pressure chamber 7 space on the bottom side of the piston 8, and a second one-way valve 23 is provided at the inlet end of the reflux chamber 24. The second one-way valve 23 is used to allow residual liquid in the negative pressure chamber 7 space on the bottom side of the piston 8 to enter the reflux chamber 24, and to prevent liquid in the reflux chamber 24 from flowing back into the negative pressure chamber 7.

[0077] In this embodiment, the preset recovery area refers to a accommodating area or recovery connection area for receiving residual liquid discharged from the negative pressure chamber 7. The preset recovery area can be a return liquid temporary storage chamber, an independent recovery chamber, a detachable return liquid container, or a recovery interface area connected to the return liquid end of the fluid circulation system, located inside or outside the valve body 1. This preset recovery area is set independently of the dripping area at the end of the pressure relief outlet 102 and is used to receive residual liquid discharged through the return chamber 24. Both the first one-way valve 21 and the second one-way valve 23 can be pressure ball valves. The opening pressure of the first one-way valve 21 is less than the suction pressure difference formed between the negative pressure chamber 7 and the end of the pressure relief outlet 102 when the piston 8 is in the negative pressure storage position; the opening pressure of the second one-way valve 23 is less than the discharge pressure difference formed when the sixth spring 10 drives the piston 8 to compress the negative pressure chamber 7.

[0078] Specifically, when the preset recovery area is a liquid return storage chamber, the outlet end of the return chamber 24 is connected to the liquid return storage chamber, which is used to temporarily store the residual liquid discharged from the negative pressure chamber 7. When the preset recovery area is an independent recovery chamber, the return chamber 24 itself can constitute an independent recovery chamber, or the outlet end of the return chamber 24 can be connected to an independent recovery chamber. With this setting, the residual liquid in the negative pressure chamber 7 can be discharged along the return chamber 24 under the compression action of the piston 8, without needing to be directly discharged back to the pressure relief outlet 102 or the pressure relief channel.

[0079] In operation, initially, valve core 4 is positioned in valve hole 3, and the pressure relief channel is closed. Stop block 18 is in the blocking position, and the suction hole 19 is misaligned with the inlet end of the recovery channel 22, thus blocking the inlet end of the first one-way valve 21. Piston 8 is in its initial position, and locking rod 37 is misaligned with locking hole 41. The second pressure applying block 35 is in a radially outward-extending pressure-applying state.

[0080] At this time, the sealing and shielding surface of the stop block 18 covers the liquid inlet end of the first one-way valve 21, and the stop block 18 and the first slide groove 20 are kept in a sliding seal by the third sliding sealing structure. The liquid inlet end of the first one-way valve 21 and the end of the pressure relief outlet 102 are in a disconnected state. The locking rod 37 and the valve body 1 are sealed and engaged by the second sliding sealing structure, and the first connecting rod 9 and the valve body 1 are sealed and engaged by the first sliding sealing structure.

[0081] When the fluid pressure on the pressure relief inlet 101 increases, the fluid pushes the valve core 4 away from the valve hole 3. The valve stem 5 moves the valve core 4 upward, opening the pressure relief channel. The fluid flows from the pressure relief inlet 101 through the valve hole 3 and the liquid flow hole on the flow plate 6 to the pressure relief outlet 102. When the valve stem 5 moves upward, the synchronizing rod 11 pushes against the top of the relief groove 12, causing the first connecting rod 9 and the piston 8 to move upward. The piston 8 moves towards the top wall of the negative pressure chamber 7, increasing the volume of the negative pressure chamber 7 on the bottom side of the piston 8 and creating negative pressure. At the same time, the sixth spring 10 is compressed and stores energy.

[0082] During the process of piston 8 moving upward to form negative pressure, the first sliding sealing structure reduces the negative pressure chamber 7 to communicate with the external space through the position of the first connecting rod 9, and the second sliding sealing structure reduces the negative pressure chamber 7 to communicate with the external space through the position of the locking rod 37, so that the negative pressure chamber 7 on the bottom side of piston 8 can form a pressure difference condition for subsequent suction of residual liquid.

[0083] When piston 8 moves upward to the negative pressure storage position, the locking hole 41 on the outer wall of piston 8 aligns with the locking rod 37, and the third spring 40 drives the locking rod 37 to insert into the locking hole 41, thereby locking piston 8. At this time, the negative pressure chamber 7 remains in a negative pressure state, and the sixth spring 10 remains in the energy storage state. Since the stop block 18 is still in the blocking position, the pressure relief fluid at the pressure relief outlet 102 cannot enter the negative pressure chamber 7 space on the bottom side of piston 8 in advance through the recovery channel 22.

[0084] When the fluid pressure on the pressure relief inlet 101 decreases, the fourth spring 43 drives the valve stem 5 and valve core 4 to fall back towards the valve hole 3. When the valve stem 5 falls back, the synchronizing rod 11 slides relative to the valve inlet 12, so the piston 8 will not fall back synchronously with the valve stem 5, but will continue to be locked in the negative pressure storage position by the locking rod 37.

[0085] In this embodiment, the latter part of the stroke in which the valve core 4 moves to the position of closing the pressure relief channel refers to the stroke range from when the pressure-applying plane 132 of the first pressure-applying block 13 begins to contact the pressure-bearing plane of the pressure-bearing block 14 to when the stop block 18 moves to the connection position.

[0086] As valve stem 5 continues to fall, the pressure-applying surface 132 of the first pressure-applying block 13 contacts the pressure-bearing surface on the top side of the pressure-bearing block 14, causing the pressure-bearing block 14 and the stop block 18 to move. When the stop block 18 moves to the connected position, the suction hole 19 connects with the inlet end of the first one-way valve 21, allowing the residual liquid at the end of the pressure relief outlet 102 to enter the negative pressure chamber 7 space on the bottom side of the piston 8 through the suction hole 19, the first one-way valve 21, and the recovery channel 22. During this stage, the piston 8 remains locked, and the negative pressure chamber 7 does not perform the discharge action.

[0087] During the process of the stop 18 moving from the blocking position to the connecting position, the third sliding sealing structure maintains the sealing fit between the stop 18 and the first slide groove 20. After the suction hole 19 is aligned with the liquid inlet end of the first one-way valve 21, the residual liquid at the end of the pressure relief outlet 102 enters the first one-way valve 21 through the suction hole 19, while the other fitting gaps between the stop 18 and the first slide groove 20 are still restricted by the third sliding sealing structure to allow bypass flow.

[0088] During the movement of the stop block 18 to the connecting position, the second link 29, through the third link 31, the fourth link 32, and the fifth link 33, drives the second push rod 34 and the second pressure block 35 to move downwards. When the second pressure block 35 moves downwards past the locking rod 37, it deflects from the pressure state to the avoidance state under the pressure of the outer wall of the locking rod 37 and is stored in the storage groove 36. After the second pressure block 35 passes the locking rod 37, it returns to the pressure state in preparation for subsequent upward movement to unlock.

[0089] After the first push rod 26 enters the first inclined groove 27 and forces the pressure block 14 to move radially away, the first pressure block 13 can continue to fall back with the valve rod 5, and the pressure block 14 is no longer continuously pressed down by the pressure surface 132. The second spring 30 releases its elastic potential energy, pushing the second support arm 28, the second connecting rod 29, and the stop block 18 to reset. When the stop block 18 resets, the suction hole 19 gradually misaligns with the liquid inlet end of the recovery channel 22 and re-blocks the liquid inlet end of the first one-way valve 21.

[0090] When the stop block 18 returns to the blocking position, the sealing blocking surface of the stop block 18 covers the liquid inlet end of the first one-way valve 21 again, the suction hole 19 is misaligned with the liquid inlet end of the first one-way valve 21, and the elastic sealing gasket is pressed or adhered to the annular sealing seat, thereby isolating the liquid inlet end of the first one-way valve 21 from the end of the pressure relief outlet 102. This blocking state is used to prevent the liquid in the negative pressure chamber 7 from flowing back to the pressure relief outlet 102 through the recovery channel 22 when the subsequent piston 8 compresses the negative pressure chamber 7 and discharges the residual liquid.

[0091] Simultaneously, the fifth link 33 drives the slider 45 to move from the bottom to the top of the second groove 44, compressing the fifth spring 46. During the movement of the slider 45 from the bottom to the top, the suction hole 19 completes its reset from the position at the inlet end of the connecting recovery channel 22 to the misaligned position. During this period, the second push rod 34 and the second pressure block 35 have not yet effectively unlocked the locking rod 37.

[0092] After the slider 45 moves to the top of the second groove 44, the fifth connecting rod 33 continues to move upward, driving the second push rod 34 and the second pressure block 35 to move upward. The second pressure block 35 slides and squeezes the second inclined groove 39 on the locking rod 37 under pressure, causing the locking rod 37 to move away from the piston 8, and the locking rod 37 exits the locking hole 41. After the piston 8 is unlocked, the sixth spring 10 is released and pushes the piston 8 to compress the negative pressure chamber 7, and the pressure in the negative pressure chamber 7 increases. Since the liquid inlet of the first one-way valve 21 has been blocked by the stop block 18, the residual liquid in the negative pressure chamber 7 cannot be discharged in reverse to the pressure relief outlet 102 through the recovery channel 22. The second one-way valve 23 opens under the action of pressure difference, and the residual liquid in the negative pressure chamber 7 enters the return chamber 24 and further flows to the preset recovery area.

[0093] Therefore, in this embodiment, the negative pressure pre-storage of the negative pressure chamber 7 is completed by the opening stroke of the valve core 4, the position of the piston 8 is maintained by the locking rod 37 and the locking hole 41, the liquid suction path between the end of the pressure relief outlet 102 and the negative pressure chamber 7 is controlled by the stop block 18, and the idle delay formed by the slider 45 and the second sliding groove 44 causes the stop block 18 to first reset and block, and then unlock the piston 8 to perform liquid discharge, so that the residual liquid at the end of the pressure relief outlet 102 is sucked in and recovered after the valve core 4 is closed.

[0094] Meanwhile, the first sliding sealing structure, the second sliding sealing structure and the third sliding sealing structure respectively seal the passage of the first connecting rod 9, the passage of the locking rod 37 and the sliding part of the stop block 18, so that each stage of the negative pressure chamber 7 forming negative pressure, the piston 8 locking and holding, the stop block 18 blocking the liquid inlet of the first one-way valve 21 and the piston 8 compressing and discharging liquid has a corresponding sealing basis.

[0095] In other embodiments, the energy storage elastic element is not limited to the sixth spring 10, but can also be an elastic diaphragm, a disc spring assembly or a gas spring, as long as it can store energy when the piston 8 moves to the negative pressure energy storage position and drive the piston 8 to compress the negative pressure chamber 7 after the piston 8 is unlocked.

[0096] In other embodiments, the first check valve 21 and the second check valve 23 are not limited to pressure ball valves, but can also be spring-loaded check valves, cone-type check valves or diaphragm-type check valves, as long as the first check valve 21 can allow residual liquid at the end of the pressure relief outlet 102 to enter the negative pressure chamber 7 space on the bottom side of the piston 8, and the second check valve 23 can allow residual liquid in the negative pressure chamber 7 to enter the return chamber 24.

[0097] In other embodiments, the preset recovery area can be configured as an independent recovery chamber, a detachable return liquid container, or a return liquid temporary storage chamber with a liquid level buffer space. The return chamber 24 can serve as a transition chamber leading to the preset recovery area, or it can constitute an independent recovery chamber itself.

[0098] In other embodiments, the first sliding sealing structure, the second sliding sealing structure, and the third sliding sealing structure are not limited to the combination structure of the guide sleeve and the corresponding sealing ring described above. They can also be a combination structure of sealing bushing, flexible sealing sleeve, labyrinth seal and elastic sealing ring, or a structure of media-resistant coating and corresponding sealing ring. As long as it can reduce fluid leakage along the sliding fit gap when the corresponding component slides relative to the valve body 1, it can be used as an alternative sealing structure of this application.

[0099] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0100] It should be noted that if the embodiments of this application involve directional indicators (such as up and down), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0101] Furthermore, the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Additionally, if the embodiments of this application involve descriptions such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" can explicitly or implicitly include at least one of those features. Furthermore, "multiple" refers to two or more. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

Claims

1. A pressure relief valve for a leak-proof fluid circulation container, characterized in that, Includes valve body (1), main valve assembly, negative pressure energy storage mechanism, locking mechanism, liquid suction blocking mechanism and delayed unlocking mechanism; The valve body (1) has a pressure relief inlet (101) and a pressure relief outlet (102), and a pressure relief channel is formed between the pressure relief inlet (101) and the pressure relief outlet (102); The main valve assembly includes a valve core (4), a valve stem (5), and a synchronizing rod (11). The valve stem (5) is movably disposed inside the valve body (1). The valve core (4) is coaxially fixed to the valve stem (5) and used to open or close the pressure relief channel. The synchronizing rod (11) is fixed to the valve stem (5) and extends radially along the valve stem (5). The negative pressure energy storage mechanism includes a piston (8), a first connecting rod (9), and an energy storage elastic element. A negative pressure chamber (7) is formed inside the valve body (1). The piston (8) is slidably disposed in the negative pressure chamber (7) and connected to the first connecting rod (9). The synchronizing rod (11) drives the first connecting rod (9) and the piston (8) to move during the opening stroke of the valve core (4), so as to increase the volume of the negative pressure chamber (7) on the bottom side of the piston (8) and enable the energy storage elastic element to store energy. The locking mechanism is used to lock the piston (8) in a preset negative pressure energy storage position; The liquid suction blocking mechanism includes a block (18), which is movably disposed in the valve body (1) and has a liquid suction hole (19). A recovery channel (22) is formed in the valve body (1) that connects to the space of the negative pressure chamber (7) at the bottom of the piston (8). The block (18) can move between the blocking position formed by blocking the liquid inlet end of the recovery channel (22) and the connection position formed by connecting the liquid suction hole (19) to the liquid inlet end of the recovery channel (22). During the latter part of the stroke when the valve core (4) moves to the position of closing the pressure relief channel, the valve core (4) can drive the stop (18) to move to the communication position, so that the residual liquid at the end of the pressure relief outlet (102) enters the negative pressure chamber (7) space on the bottom side of the piston (8) through the suction hole (19) and the recovery channel (22). The delayed unlocking mechanism is used to release the locking mechanism after the stop (18) is reset to the blocking position, so that the energy storage elastic element drives the piston (8) to compress the negative pressure chamber (7) and discharge the residual liquid in the negative pressure chamber (7) to the preset recycling area.

2. The anti-leakage fluid circulation container pressure relief valve as described in claim 1, characterized in that, The valve body (1) is fixedly provided with a base plate (2) and a flow plate (6). The base plate (2) is located near the pressure relief inlet (101). A valve hole (3) is opened on the base plate (2). The valve core (4) can be located in the valve hole (3) to close the pressure relief channel. A liquid flow hole for fluid to pass through is opened on the flow plate (6). The valve stem (5) slides through the flow plate (6).

3. The anti-leakage fluid circulation container pressure relief valve as described in claim 2, characterized in that, A second fixed ring (42) is fixedly sleeved on the outside of the valve stem (5), and a fourth spring (43) is sleeved on the outside of the valve stem (5). The two ends of the fourth spring (43) are fixedly connected to the top wall of the second fixed ring (42) and the bottom wall of the flow plate (6) respectively, so as to apply a reset force toward the valve hole (3) to the valve stem (5) and the valve core (4).

4. The anti-leakage fluid circulation container pressure relief valve as described in claim 1, characterized in that, An avoidance groove (12) is provided on the outer wall of the first connecting rod (9) along the axial direction of the valve stem (5), and the synchronizing rod (11) extends into the avoidance groove (12); during the opening stroke of the valve core (4), the synchronizing rod (11) pushes against the top of the avoidance groove (12) to drive the first connecting rod (9) and the piston (8) to move; during the process of the valve core (4) moving to the position of closing the pressure relief channel, the synchronizing rod (11) slides relative to the avoidance groove (12) so that the piston (8) is kept at the preset negative pressure energy storage position.

5. A leak-proof fluid circulation container pressure relief valve as described in claim 1, characterized in that, The energy storage elastic element is a sixth spring (10). The sixth spring (10) is located between the top side of the piston (8) and the top wall of the negative pressure chamber (7). The two ends of the sixth spring (10) are fixedly connected to the top side wall of the piston (8) and the top wall of the negative pressure chamber (7), respectively. When the piston (8) moves toward the top wall of the negative pressure chamber (7), the volume of the negative pressure chamber (7) on the bottom side of the piston (8) increases, and the sixth spring (10) is compressed to store energy.

6. A leak-proof fluid circulation container pressure relief valve as described in claim 1, characterized in that, The locking mechanism includes a locking rod (37), a first fixed ring (38), and a third spring (40). The locking rod (37) is radially movable and inserted into the inner side of the valve body (1). A locking hole (41) is provided on the outer side wall of the piston (8) to engage with the locking rod (37). The first fixed ring (38) is sleeved and fixed to the outer side of the locking rod (37). The third spring (40) is sleeved on the outer side of the locking rod (37), and the two ends of the third spring (40) are respectively fixed to the ring wall of the first fixed ring (38) and the inner side wall of the valve body (1). The third spring (40) is used to drive the locking rod (37) to move toward the locking hole (41) so that the locking rod (37) can be inserted into the locking hole (41) and lock the piston (8).

7. A leak-proof fluid circulation container pressure relief valve as described in claim 6, characterized in that, The locking rod (37) is provided with a second inclined groove (39). The delayed unlocking mechanism can act on the second inclined groove (39) after the stop (18) is reset to the blocking position, so as to drive the locking rod (37) to move away from the piston (8) and exit the lock hole (41).

8. A leak-proof fluid circulation container pressure relief valve as described in claim 7, characterized in that, The valve body (1) has a first sliding groove (20) on its inner side wall. The first sliding groove (20) is located near the end of the pressure relief outlet (102). The stop block (18) is slidably disposed in the first sliding groove (20). A first one-way valve (21) is provided at the liquid inlet end of the recovery channel (22). The first one-way valve (21) is used to allow the residual liquid at the end of the pressure relief outlet (102) to enter the negative pressure chamber (7) space on the bottom side of the piston (8) through the recovery channel (22) and prevent the residual liquid in the negative pressure chamber (7) space on the bottom side of the piston (8) from flowing back to the pressure relief outlet (102) through the recovery channel (22). When the stop block (18) is in the blocking position, it blocks the liquid inlet end of the first one-way valve (21). When the stop block (18) is in the communicating position, it makes the suction hole (19) communicate with the liquid inlet end of the first one-way valve (21).

9. A leak-proof fluid circulation container pressure relief valve as described in claim 8, characterized in that, A first pressure block (13) is fixedly provided on the valve stem (5). The first pressure block (13) has a first inclined surface (131) and a pressure surface (132). A telescopic rod (16) is fixedly connected to the side wall of the stop block (18). The telescopic rod (16) is radially telescopically extended along the valve stem (5). A pressure-bearing block (14) is fixed at one end of the telescopic rod (16) away from the stop block (18). A first spring (17) is sleeved on the outside of the telescopic rod (16). The two ends of the first spring (17) are respectively fixedly connected to the outer wall of the stop block (18) and the outer wall of the pressure-bearing block (14). The pressure-bearing block (14) can move radially relative to the stop block (18) along the valve stem (5). A pressure-bearing surface is formed on the top side of the pressure-bearing block (14) for contacting the pressure surface (132). A second inclined surface (15) is formed on one side of the bottom of the pressure-bearing block (14) for cooperating with the first inclined surface (131).

10. A leak-proof fluid circulation container pressure relief valve as described in claim 9, characterized in that, The valve body (1) has a first support arm (25) fixed on its inner wall. The pressure block (14) has a first inclined groove (27) on the other side of its bottom. The first support arm (25) has a first push rod (26) fixed on its top side. The first push rod (26) can enter the first inclined groove (27) and force the pressure block (14) to avoid the valve stem (5) radially. The stop block (18) is fixedly connected to a second support arm (28). The bottom side of the second support arm (28) is fixedly connected to a second connecting rod (29). The second connecting rod (29) slides through the first support arm (25). The outside of the second connecting rod (29) is fitted with a second spring (30). The two ends of the second spring (30) are fixedly connected to the top side of the first support arm (25) and the bottom side of the second support arm (28) respectively, so as to drive the stop block (18) to reset from the communicating position to the blocking position.

11. A leak-proof fluid circulation container pressure relief valve as described in claim 10, characterized in that, The delayed unlocking mechanism includes a third link (31), a fourth link (32), a fifth link (33), a second push rod (34), a slider (45), and a fifth spring (46); the third link (31) is fixed between the bottom end of the second link (29) and the top end of the fourth link (32), the fifth link (33) is fixed to the bottom end of the fourth link (32), the second push rod (34) is sleeved on the bottom end of the fifth link (33), a second groove (44) is provided on the inner side of the top end of the second push rod (34), the slider (45) is slidably disposed in the second groove (44) and fixedly connected to the bottom end of the fifth link (33), and the two ends of the fifth spring (46) are fixedly connected to the top wall of the second groove (44) and the top wall of the slider (45), respectively; The second push rod (34) has a second pressure block (35) that can be elastically deflected on its outer wall. The second push rod (34) has a receiving groove (36) for accommodating the second pressure block (35). The second pressure block (35) has a pressing state that extends radially outward relative to the axis of the second push rod (34), and a avoidance state that is housed in the receiving groove (36) and parallel to the axis of the second push rod (34).

12. A leak-proof fluid circulation container pressure relief valve as described in claim 11, characterized in that, When the second pressure block (35) moves down with the second push rod (34) and passes the locking rod (37), it can deflect from the pressure state to the avoidance state; when the second pressure block (35) moves up with the second push rod (34), it can remain in the pressure state and slide to squeeze the second inclined groove (39) to drive the locking rod (37) to move away from the piston (8).

13. A leak-proof fluid circulation container pressure relief valve as described in claim 11, characterized in that, The slider (45) can move from the bottom to the top of the second trough (44). During the movement of the slider (45) from the bottom to the top of the trough, the suction hole (19) is reset from the position of the liquid inlet end of the recycling channel (22) to a position that is misaligned with the liquid inlet end of the recycling channel (22).

14. A leak-proof fluid circulation container pressure relief valve as described in claim 1, characterized in that, The valve body (1) has a reflux chamber (24) that connects to a preset recovery area. The liquid inlet of the reflux chamber (24) is connected to the negative pressure chamber (7) space on the bottom side of the piston (8). A second one-way valve (23) is provided at the liquid inlet of the reflux chamber (24). The second one-way valve (23) is used to allow residual liquid in the negative pressure chamber (7) space on the bottom side of the piston (8) to enter the reflux chamber (24) and prevent liquid in the reflux chamber (24) from flowing back into the negative pressure chamber (7).

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