An emergency relief valve structure capable of quick pressure relief

Abstract

This invention discloses a rapid pressure relief valve structure, aiming to address the shortcomings of slow opening speed and susceptibility to leakage in emergency relief valves. The invention includes a valve body and a valve disc, with the valve disc covering the valve body. An inner and outer sealing ring are installed between the valve disc and the valve body to form a double sealing structure. A pressure accumulator groove is provided between the inner and outer sealing rings on the end face of the valve body, and the pressure accumulator groove is connected to a gas storage tank via a pipeline. The rapid pressure relief valve structure of this invention features a double sealing structure, preventing system media from leaking outwards through the sealing points, avoiding media leakage and environmental pollution, and reducing material loss within the system. Furthermore, the double sealing structure assists in the rapid opening of the valve disc, increasing the valve disc opening speed and facilitating rapid pressure relief.

Description

Technical Field

[0001] This invention relates to a safety valve, and more specifically, to an emergency relief valve structure capable of rapid pressure relief. Background Technology

[0002] Emergency relief valves are a commonly used type of safety valve. In emergencies, they open promptly to release pressure and prevent excessive system pressure from causing safety hazards. Normally, the valve disc of an emergency relief valve seals against the valve body. To improve sealing performance, a sealing ring is typically installed between the valve disc and the valve body. However, this sealing ring is usually a single ring, and after prolonged use, leakage can easily occur at the sealing ring location, causing the system medium to leak out before reaching the valve's opening pressure. When the system pressure reaches the emergency relief valve's opening pressure, it is desirable for the valve to open quickly to release pressure. However, in many cases, emergency relief valves cannot open quickly, hindering rapid pressure relief. Summary of the Invention

[0003] To overcome the above shortcomings, the present invention provides an emergency relief valve structure that can quickly release pressure. It has a double sealing structure, which prevents the system medium from leaking out through the sealing position, avoids media leakage and environmental pollution, and reduces material loss in the system. Moreover, the double sealing structure can assist the valve disc to open quickly, improve the valve disc opening speed, and facilitate rapid pressure relief.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an emergency relief valve structure that can quickly release pressure, including a valve body and a valve disc, the valve disc covering the valve body, an inner sealing ring and an outer sealing ring being installed between the valve disc and the valve body to form a double sealing structure, a pressure accumulator groove being provided between the inner sealing ring and the outer sealing ring on the end face of the valve body, and the pressure accumulator groove being connected to a gas storage tank through a pipeline.

[0005] When the emergency relief valve is in use, a double sealing structure is formed between the valve disc and the valve body, greatly improving sealing performance. An accumulator is located between the inner and outer sealing rings, and is connected to a gas storage tank via a pipeline. High-pressure gas from the gas storage tank flows into the accumulator. The pressure inside the gas storage tank is not less than the opening pressure of the emergency relief valve. When leakage occurs at the inner sealing ring, because the pressure inside the accumulator is greater than the pressure inside the valve body, the medium in the accumulator flows into the valve body, preventing leakage of the medium inside the valve body. When leakage occurs at the outer sealing ring, the leaked medium is the same medium that flows from the gas storage tank into the accumulator. When the emergency relief valve is opened tightly, the pressure in the accumulator acts on the valve disc, assisting in rapid valve disc opening and thus increasing the valve disc opening speed, which is beneficial for rapid pressure relief.

[0006] The emergency relief valve structure of the present invention features a double sealing structure, which prevents the system medium from leaking outward through the sealing position, thus avoiding environmental pollution and reducing material loss within the system. Furthermore, the double sealing structure assists the valve disc in opening quickly, increasing the valve disc opening speed and facilitating rapid pressure relief.

[0007] Preferably, a piston cylinder is installed on the valve body, and an inflation plug and a preload spring are installed inside the piston cylinder. The inflation plug abuts against one end of the piston cylinder, and an inflation port is provided at the other end of the piston cylinder. The inflation port is connected to a reversing cylinder through a pipe. A reversing plug is installed inside the reversing cylinder, and a positioning spring is installed between the reversing plug and the reversing cylinder. A through vent is provided on the side wall of the reversing plug, and the pressure accumulator is connected to the vent. A high-pressure air inlet and a pressure-holding air inlet are provided on the side wall of the reversing cylinder for communication with the vent. The air storage tank includes a high-pressure tank and a pressure-holding tank. The high-pressure air inlet is connected to the high-pressure tank, and the pressure-holding air inlet is connected to the pressure-holding tank. Before the pressure inside the valve body reaches the point where the emergency relief valve is about to open, the inflation plug moves, pressing the gas in the piston cylinder into the reversing cylinder and acting on the reversing plug, thereby pushing the reversing plug to move, so that the vent on the reversing plug switches from being connected to the pressure-holding air inlet to being connected to the high-pressure air inlet.

[0008] System pressure acts on the inflation plug. As the system pressure increases, when it approaches the opening pressure of the emergency relief valve, before the valve opens, the inflation plug is pushed by the gas in the piston cylinder into the reversing cylinder, which in turn pushes the reversing plug, causing it to move. This switches the vent on the reversing plug from being connected to the pressure-holding inlet to being connected to the high-pressure inlet. The high-pressure tank then connects to the accumulator, increasing the pressure in the accumulator and thus increasing the upward lifting force on the valve disc. This provides an auxiliary opening effect during the valve disc opening process, facilitating rapid valve disc opening. After the system pressure is released, the reversing plug and inflation plug return to their original positions under the action of the positioning spring and preload spring, and the vent switches from being connected to the high-pressure inlet to being connected to the pressure-holding inlet. When the system pressure is normal, the pressure-holding tank connects to the accumulator, and the pressure inside the pressure-holding tank is equivalent to the opening pressure of the emergency relief valve, preventing leakage of the system medium. When the system pressure is too high and the emergency relief valve is about to open, the high-pressure tank is connected to the accumulator tank, and the pressure in the accumulator tank increases, which increases the lifting force on the valve disc, thus increasing the auxiliary opening effect during the valve disc opening process and facilitating the rapid opening of the valve disc.

[0009] Preferably, one end of the reversing cylinder is connected to a positioning end cover, the positioning end cover is provided with a positioning protrusion, one end of the reversing plug abuts against the positioning protrusion, and an air intake chamber is formed between the positioning end cover and the reversing plug inside the reversing cylinder, and the air inlet and the air intake chamber are connected by a pipe.

[0010] The positioning end cap facilitates the positioning of the reversing plug.

[0011] Preferably, a limit frame is installed on the valve body, positioned above the valve disc. A lifting rod is installed on the limit frame, and a return spring is installed between the limit frame and the rod. The lower end of the rod is lower than the limit frame, and a rack is provided on the upper part of the rod. A rotating turntable is installed on the reversing cylinder, with meshing teeth that mesh with the rack. The turntable has a movable flow passage, and fixed flow passages and flow cavities are respectively provided on both sides of the turntable. The fixed flow passages and movable flow passages are connected to each other. The fixed flow passages are connected to the accumulator tank through a pipe, and the flow cavities are connected to the vent.

[0012] After the valve disc opens to a certain height, its upper surface abuts against the push rod, lifting the push rod upwards. The rack on the push rod engages with the meshing teeth on the turntable, causing the turntable to rotate. The movable flow hole on the turntable is misaligned with the fixed flow hole, and the turntable closes to seal the fixed flow hole, thus cutting off the flow channel between the accumulator tank and the gas storage tank. The high-pressure medium in the gas storage tank is no longer supplied to the accumulator tank, facilitating the rapid discharge of the medium from the gap between the valve disc and the valve body, accelerating the pressure relief rate. If the gas storage tank supplies high-pressure medium to the accumulator tank, the high-pressure medium will hinder the discharge of the medium from the system, affecting the system's pressure relief rate.

[0013] Preferably, the reversing cylinder sidewall is provided with a clearance groove and a flow hole communicating with the flow cavity. A vent pipe is connected between the flow hole and the vent hole, and the vent pipe passes through the clearance groove. The clearance groove facilitates the installation of the vent pipe and avoids interference.

[0014] Preferably, a connecting seat is fastened to the turntable position on the reversing cylinder, and a fixed flow hole is set on the connecting seat. The connecting seat is provided with a connecting cavity and several air vents. The fixed flow hole and air vents are both connected to the connecting cavity. Several air inlet pipes connected to the accumulator are connected to the valve body, and the air inlet pipes are connected to the air vents one by one.

[0015] The connector makes it easy to install the turntable and connect the air intake pipe.

[0016] Preferably, a guide cylinder is installed on the limit frame, and a T-shaped connecting section is provided at the lower part of the push rod. The upper part of the connecting section is fitted into the guide cylinder, and a cap is installed at the upper end of the guide cylinder. The push rod moves through the cap, and a return spring abuts between the cap and the upper end of the connecting section. The push rod is installed stably and reliably.

[0017] Preferably, a boss is provided on the inner wall of the reversing cylinder, and a limiting gap is provided between the boss and the reversing plug.

[0018] The protrusion limits the movement distance of the commutator, preventing it from moving too far.

[0019] Preferably, the high-pressure air inlet and the pressure-holding air inlet are positioned between the two ends of the reversing plug, so that the high-pressure air inlet and the pressure-holding air inlet have two states: one is sealed and covered by the outer wall of the reversing plug, and the other is connected to the vent on the reversing plug.

[0020] The high-pressure air inlet and the pressure-maintaining air inlet should either be closed or connected to the vent to prevent air leakage caused by connection to other locations.

[0021] Preferably, several guide rods are evenly distributed on the valve disc, the guide rods are movably connected to the valve body, and the lower end of the guide rod is connected to an anti-loosening nut.

[0022] The guide rod design makes the opening and closing of the valve disc smoother and more reliable.

[0023] Compared with the prior art, the beneficial effects of the present invention are: the emergency relief valve structure of the present invention has a double sealing structure, the system medium will not leak out through the sealing position, avoid medium leakage and environmental pollution, and reduce material loss in the system; moreover, the double sealing structure can assist the valve disc to open quickly, improve the valve disc opening speed, and facilitate rapid pressure relief. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a partial structural diagram of the reversing cylinder position of the present invention;

[0026] In the diagram: 1. Valve body, 2. Valve disc, 3. Guide rod, 4. Anti-loosening nut, 5. Mounting plate, 6. Guide hole, 7. Inner sealing ring, 8. Outer sealing ring, 9. Accumulator groove, 10. Piston cylinder, 11. Positioning block, 12. Inflation plug, 13. Preload spring, 14. Inflation hole, 15. Reversing cylinder, 16. Reversing plug, 17. Positioning spring, 18. Positioning end cap, 19. Positioning protrusion, 20. Air inlet chamber, 21. Connector, 22. Boss, 2 3. Vent hole; 24. High-pressure air inlet; 25. Pressure-holding air inlet; 26. Limiting bracket; 27. Column; 28. Top rod; 29. ​​Return spring; 30. Rack; 31. Guide cylinder; 32. Connecting section; 33. Cap; 34. Turntable; 35. Movable flow hole; 36. Fixed flow hole; 37. Flow cavity; 38. Connecting seat; 39. Connecting cavity; 40. Vent interface; 41. Clearing groove; 42. Flow hole; 43. Vent pipe. Detailed Implementation

[0027] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0028] Example: A structure for a rapid pressure relief emergency relief valve (see attached diagram) Figure 1 Appendix Figure 2 The valve assembly includes a valve body 1 and a valve disc 2, with the valve disc covering the valve body. Several guide rods 3 are evenly distributed and connected to the valve disc, and the guide rods are movably connected to the valve body. Anti-loosening nuts 4 are connected to the lower ends of the guide rods. Mounting plates 5 are connected to the valve body's outer wall, corresponding to the valve rods. Guide holes 6 are provided on the mounting plates, and the guide rods are movably inserted into the guide holes. An inner sealing ring 7 and an outer sealing ring 8 are installed between the valve disc and the valve body to form a double sealing structure. A pressure accumulator groove 9 is provided between the inner and outer sealing rings on the valve body's end face, and the pressure accumulator groove is connected to a gas storage tank via a pipe. An upper mounting groove is provided on the lower surface of the valve disc, and a lower mounting groove is provided on the upper end face of the valve body. The inner sealing ring is installed in the lower mounting groove, and the outer sealing ring is installed in the upper mounting groove.

[0029] A piston cylinder 10 is mounted on the valve body, and the piston cylinder is connected to the valve body. Several positioning blocks 11 are connected to the edge of the piston cylinder opening inside the valve body. An inflation plug 12 and a preload spring 13 are installed inside the piston cylinder. The inflation plug abuts against a positioning block at one end of the piston cylinder, and an inflation hole 14 is provided at the other end of the piston cylinder. The inflation hole is connected to a reversing cylinder 15 through a pipe. A reversing plug 16 is installed inside the reversing cylinder, and a positioning spring 17 is installed between the reversing plug and the reversing cylinder. A positioning end cap 18 is connected to one end of the reversing cylinder, and a positioning protrusion 19 is provided on the positioning end cap. One end of the reversing plug abuts against the positioning protrusion. An air intake chamber 20 is formed between the positioning end cap and the reversing plug inside the reversing cylinder. The inflation hole and the air intake chamber are connected through a pipe. A connector 21 is provided on the positioning end cap, and a pipe is connected between the connector and the inflation hole. A boss 22 is provided on the inner wall of the reversing cylinder, and a limiting distance is provided between the boss and the reversing plug. The high-pressure air inlet and the pressure-holding air inlet are positioned between the two ends of the reversing plug, so that the high-pressure air inlet and the pressure-holding air inlet have two states: one is sealed and covered by the outer wall of the reversing plug, and the other is connected to the vent on the reversing plug.

[0030] The reversing cylinder has a through vent 23 on its side wall, and the pressure accumulators are all connected to the vent. The reversing cylinder has a high-pressure inlet 24 and a pressure-holding inlet 25 connected to the vent. The distance between the high-pressure inlet and the pressure-holding inlet is smaller than the diameter of the vent. The gas storage tank includes a high-pressure tank and a pressure-holding tank. The high-pressure inlet is connected to the high-pressure tank, and the pressure-holding inlet is connected to the pressure-holding tank. Before the pressure in the valve body reaches the point where the emergency relief valve is about to open, the inflation plug moves, pressing the gas in the piston cylinder into the reversing cylinder and acting on the reversing cylinder, thereby pushing the reversing cylinder to move. This causes the vent on the reversing cylinder to switch from being connected to the pressure-holding inlet to being connected to the high-pressure inlet. One-way vent valves are installed in both the high-pressure inlet and the pressure-holding inlet. The pressure in the pressure-holding tank is equal to the opening pressure of the emergency relief valve, and the pressure in the high-pressure tank is 1.5-3 times the pressure in the pressure-holding tank. When the system pressure reaches 90% of the emergency relief valve opening pressure, the inflation plug begins to be pushed.

[0031] A limit bracket 26 is installed on the valve body, positioned above the valve disc. A column 27 is connected to the limit bracket, with its lower end connected to a mounting plate. A lifting rod 28 is installed on the limit bracket, positioned near the center of the valve disc. A return spring 29 is installed between the limit bracket and the rod. The lower end of the rod is below the limit bracket, and a rack 30 is located on the upper part of the rod. A guide cylinder 31 is installed on the limit bracket. A T-shaped connecting section 32 is located at the lower part of the rod, with its upper part fitted into the guide cylinder. A cap 33 is installed at the upper end of the guide cylinder, through which the rod moves. The return spring abuts against the cap and the upper end of the connecting section. A rotating turntable 34 is installed on the reversing cylinder, with meshing teeth that mesh with the rack. A mounting groove is located on the outer wall of the reversing cylinder, corresponding to the rack. Gear teeth are fitted into the mounting groove, with one section of the meshing teeth arc-shaped, protruding to the bottom of the mounting groove.

[0032] The turntable has a movable flow passage 35, and fixed flow passages 36 and flow cavities 37 are respectively provided on both sides of the turntable. The fixed flow passages and movable flow passages are connected to each other. The fixed flow passages are connected to the accumulator tank through a pipe, and the flow cavities are connected to the vent holes. A connecting seat 38 is fastened to the turntable position on the reversing cylinder. The fixed flow passages are set on the connecting seat. The connecting seat has a connecting cavity 39 and several vent ports 40. The fixed flow passages and vent ports are all connected to the connecting cavity. Several air inlet pipes 40 connected to the accumulator tank are connected to the valve body. The air inlet pipes are connected to the vent ports one by one. A clearance groove 41 is provided on the side wall of the reversing cylinder. A flow passage 42 connected to the flow cavity is provided on the side wall of the reversing cylinder. A vent pipe 43 is connected between the flow passage and the vent port, and the vent pipe passes through the clearance groove.

[0033] When the emergency relief valve is in use, a double sealing structure is formed between the valve disc and the valve body, greatly improving sealing performance. An accumulator is located between the inner and outer sealing rings, and is connected to a gas storage tank via a pipeline. High-pressure gas from the gas storage tank flows into the accumulator. The pressure inside the gas storage tank is not less than the opening pressure of the emergency relief valve. When leakage occurs at the inner sealing ring, because the pressure inside the accumulator is greater than the pressure inside the valve body, the medium in the accumulator flows into the valve body, preventing leakage of the medium inside the valve body. When leakage occurs at the outer sealing ring, the leaked medium is the same medium that flows from the gas storage tank into the accumulator. When the emergency relief valve is opened tightly, the pressure in the accumulator acts on the valve disc, assisting in rapid valve disc opening and thus increasing the valve disc opening speed, which is beneficial for rapid pressure relief.

[0034] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications may be made without departing from the technical solutions described in the claims.

Claims

1. A quick pressure relief emergency relief valve structure comprising a valve body, a valve disc, the valve disc being covered on the valve body, characterized in that, A double sealing structure is formed between the valve disc and the valve body by installing an inner sealing ring and an outer sealing ring. A pressure accumulator groove is provided between the inner and outer sealing rings on the valve body end face, and the pressure accumulator groove is connected to an air storage tank via a pipe. A piston cylinder is installed on the valve body, and an inflation plug and a preload spring are installed inside the piston cylinder. The inflation plug abuts against one end of the piston cylinder, and an inflation port is provided at the other end of the piston cylinder. The inflation port is connected to a reversing cylinder via a pipe, and a reversing plug is installed inside the reversing cylinder. A positioning spring is installed between the reversing plug and the reversing cylinder. A through vent hole is provided on the side wall of the reversing plug, and the pressure accumulator groove is connected to the vent hole. A high-pressure air inlet and a pressure-holding air inlet are provided on the side wall of the reversing cylinder for communication with the vent hole. The air storage tank includes a high-pressure tank and a pressure-holding tank. The high-pressure air inlet is connected to the high-pressure tank, and the pressure-holding air inlet is connected to the pressure-holding tank. The pressure inside the valve body reaches a tight... Before the emergency relief valve opens, the inflation plug moves, pressing the gas in the piston cylinder into the reversing cylinder, which in turn pushes the reversing plug to move, causing the vent on the reversing plug to switch from being connected to the pressure-holding inlet to being connected to the high-pressure inlet. A limit bracket is installed on the valve body, positioned above the valve disc. A lifting rod is installed on the limit bracket, and a return spring is installed between the limit bracket and the rod. The lower end of the rod is lower than the limit bracket, and a rack is provided on the upper part of the rod. A rotating turntable is installed on the reversing cylinder, with meshing teeth that mesh with the rack. The turntable has a movable flow passage, and fixed flow passages and flow cavities are respectively provided on both sides of the turntable. The fixed flow passages and movable flow passages are connected to each other. The fixed flow passages are connected to the accumulator tank through a pipe, and the flow cavities are connected to the vent.

2. The emergency relief valve structure according to claim 1, wherein One end of the reversing cylinder is connected to the positioning end cover, which has a positioning protrusion. One end of the reversing plug abuts against the positioning protrusion. An air intake chamber is formed between the positioning end cover and the reversing plug inside the reversing cylinder. The air inlet and the air intake chamber are connected by a pipe.

3. The emergency relief valve structure according to claim 1, wherein The reversing cylinder sidewall is provided with a clearance groove and a flow passage hole that communicates with the flow cavity. A vent pipe is connected between the flow passage hole and the vent hole, and the vent pipe passes through the clearance groove.

4. The emergency relief valve structure according to claim 1, wherein A connecting seat is fastened to the turntable position on the reversing cylinder. A fixed flow hole is set on the connecting seat. The connecting seat is provided with a connecting cavity and several air ports. The fixed flow hole and air ports are all connected to the connecting cavity. Several air inlet pipes connected to the accumulator tank are connected to the valve body. The air inlet pipes are connected to the air ports one by one.

5. The emergency relief valve structure according to claim 1, wherein A guide tube is installed on the limit frame, and a T-shaped connecting section is provided at the lower part of the top rod. The upper part of the connecting section is fitted into the guide tube. A cap is installed at the upper end of the guide tube, and the top rod moves through the cap. A return spring abuts between the cap and the upper end of the connecting section.

6. The emergency relief valve structure for rapid pressure relief according to any one of claims 1 to 5, characterized in that, The inner wall of the reversing cylinder is provided with a boss, and a limiting gap is provided between the boss and the reversing plug.

7. The emergency relief valve structure for rapid pressure relief according to any one of claims 1 to 5, characterized in that, The high-pressure air inlet and the pressure-holding air inlet are positioned between the two ends of the reversing plug, so that the high-pressure air inlet and the pressure-holding air inlet have two states: one is sealed and covered by the outer wall of the reversing plug, and the other is connected to the vent on the reversing plug.

8. The emergency relief valve structure for rapid pressure relief according to any one of claims 1 to 5, characterized in that, Several guide rods are evenly distributed on the valve disc, and the guide rods are movably connected to the valve body. The lower end of the guide rod is connected to an anti-loosening nut.

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