Double-eccentric butterfly valve for hydrogen receiving station

Abstract

The utility model discloses a double-eccentric butterfly valve for a hydrogen receiving station, which belongs to the technical field of double-eccentric butterfly valves and comprises a valve seat, a heat insulation layer is mounted in the valve seat, heat insulation materials are coated outside the valve seat, connecting ports are arranged at two ends of the valve seat, a working component is mounted on the side edge of the valve seat, and a constant-temperature component is mounted on the inner wall of the valve seat. According to the constant-temperature assembly, a part can be reserved for storage in the flowing process of liquid hydrogen, the hollow part on one side of the butterfly valve is cooled through the temperature of the liquid hydrogen, it is guaranteed that the temperature of the sealing ring located on the hollow part is basically kept consistent with the temperature of the liquid hydrogen, and therefore in the valve opening process, the temperature of the sealing ring is kept constant. The liquid hydrogen has little influence on the cooling effect of the sealing ring, so that the sealing stability of the sealing ring is maintained, the possibility of hydrogen leakage is reduced, meanwhile, the liquid hydrogen can generate hydrogen in the cooling process of the hollow part of the valve seat, the sealing performance of the valve seat is guaranteed, and the use and sealing of equipment are more stable.

Description

Technical Field

[0001] This utility model specifically relates to a double eccentric butterfly valve for hydrogen receiving stations, belonging to the technical field of double eccentric butterfly valves. Background Technology

[0002] Cryogenic valves refer to valves whose medium temperature is between -40°C and -196°C. Common cryogenic valves include cryogenic butterfly valves, cryogenic gate valves, cryogenic ball valves, cryogenic stop valves, cryogenic check valves, and cryogenic throttle valves. They are mainly used in hydrogen, liquefied natural gas (LNG) plants, LPG / LNG storage tanks, receiving bases, and satellite stations. Among them, cryogenic valves for hydrogen are specifically designed for cryogenic media such as hydrogen. Their main function is to control the flow of hydrogen and ensure the safe operation of the system in cryogenic environments. These valves usually use special materials and sealing structures to adapt to extremely low temperature and high pressure environments and prevent hydrogen leakage. They are widely used in hydrogen receiving stations.

[0003] The double eccentric butterfly valve is a further improvement on the single eccentric butterfly valve. Its structural feature is that the valve stem axis is offset from both the center of the butterfly plate and the center of the valve body. The double eccentric effect allows the butterfly plate to quickly disengage from the valve seat after the valve is opened, greatly eliminating unnecessary excessive compression and scraping between the butterfly plate and the valve seat, reducing the opening resistance, reducing wear, and improving the valve seat life. The significant reduction in scraping also allows the double eccentric butterfly valve to use a metal valve seat, improving the application of butterfly valves in high and low temperature fields.

[0004] Because the butterfly valve's internal disc can be in both open and closed states during use, during the closing process, the closed side of the disc contains low-temperature liquid hydrogen, while the closed side is in a hollow pipe environment. This results in inconsistent temperatures on both sides of the butterfly valve, with a significant temperature difference. Consequently, the valve seat temperatures on both sides of the butterfly valve are inconsistent, indirectly causing the hollow sealing ring of the butterfly valve to be at a higher temperature. When the valve is opened, the liquid hydrogen comes into contact with the sealing ring, causing its temperature to drop sharply. This makes the sealing ring prone to rapid deformation due to temperature changes, resulting in bending or wrinkling. Consequently, when the valve is closed again, leakage is likely to occur. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a double eccentric butterfly valve for hydrogen receiving stations, in order to maintain a low temperature on both sides of the valve.

[0006] A double eccentric butterfly valve for a hydrogen receiving station includes a valve seat with an internal heat insulation layer and an external heat insulation material coating. Both ends of the valve seat have connection interfaces. A working component is mounted on the side of the valve seat, and a thermostatic component is mounted on the inner wall of the valve seat. The thermostatic component includes a gear one, the end of which is connected to the working component. A gear two meshes with the side of the gear one, and the end of the gear two is rotatably connected to the inner wall of the valve seat. The end of the gear two is rotatably connected to the end of a transmission rod, and the other end of the transmission rod is rotatably connected to the end of a push rod. A movable cover is mounted on the end of the push rod. A storage compartment is slidably connected to the side of the movable cover and is mounted on the inner wall of the valve seat. Three sets of cooling nets are mounted on the side of the movable cover and are attached to the inner wall of the valve seat.

[0007] The detection component is connected to the side of the valve seat. The detection component can observe whether there is a leak during the flow of hydrogen.

[0008] Furthermore, the connection between the end of the transmission rod and the second gear is located at one-sixth of the central axis of the second gear. Limiting shafts are provided on both sides of the push rod, and the limiting shafts are installed on the inner wall of the valve seat. The push rod is inserted into the interior of the storage compartment, and the contact area is sealed. The side of the movable cover is embedded in the surface of the storage compartment.

[0009] Furthermore, the storage chamber stores liquid hydrogen in operation, and a connecting pipe is installed on one side of the storage chamber. A sealing ring passes through the end of the connecting pipe, and an airbag is installed on the side of the sealing ring.

[0010] Furthermore, each end of the cooling net is connected to a manifold, and the end of the manifold is equipped with a pressure relief valve. The end of the pressure relief valve is fixedly connected to an air ring, and a nozzle is installed on the inner wall of the air ring.

[0011] Furthermore, the detection assembly includes a collection cover, the bottom of which covers the surface of the valve seat, a conduit extending through the top of the collection cover, a branch pipe fixedly connected to the side of the conduit, a sleeve installed at the end of the branch pipe, and an observation window installed at the top of the conduit.

[0012] Furthermore, a movable frame is slidably connected to the inner wall of the observation window, and limit plates are fixedly connected to the four corners of the movable frame. A reaction plate is fitted inside the movable frame. The observation window is made of transparent material and is installed in an ambient temperature environment.

[0013] Furthermore, a water storage rack is fixedly connected to the inner wall of the conduit, and a drain pipe is installed on the side of the conduit.

[0014] Furthermore, the interior of the reaction plate is provided with several sets of through holes, and the interior of the reaction plate is made of copper oxide material.

[0015] Furthermore, the working components include a valve cover, the bottom of which is fixedly connected to the top of the valve seat. A valve stem is rotatably connected to the inner wall of the valve cover. A handwheel is provided at the top of the valve stem. A butterfly plate is installed on the side of the valve stem and is fitted inside the valve seat. The butterfly plate is attached to the inner wall of the valve seat when the equipment is closed.

[0016] Beneficial effects

[0017] The process of achieving constant temperature through the internal structure of the device differs from existing technologies. This novel thermostatic component can reserve a portion for storage during the flow of liquid hydrogen and uses the temperature of the liquid hydrogen itself to cool the hollow part on one side of the butterfly valve. This ensures that the temperature of the sealing ring in the hollow part is basically consistent with the temperature of the liquid hydrogen. Therefore, when the valve is opened, the cooling effect of liquid hydrogen on the sealing ring is minimal, ensuring minimal deformation of the sealing ring and maintaining the stability of the seal, thus reducing the possibility of hydrogen leakage. At the same time, the liquid hydrogen generates hydrogen gas during the cooling process in the hollow part of the valve seat. This hydrogen gas provides support and inflation to the internal structure of the thermostatic component. The pressure of the hydrogen gas helps the sealing ring to wrap around the edge of the butterfly valve, further filling the gap between the butterfly valve and the inner wall of the valve seat, ensuring its sealing performance, and making the use and sealing of the device more stable.

[0018] During the process of generating hydrogen gas for cooling, the higher the hydrogen content and the higher the pressure, the more the internal pressure relief valve opens, allowing the internal hydrogen gas to vent and circulate within the main valve. This allows the circulating hydrogen gas to spiral along the inner wall of the equipment, blowing air onto the inner wall of the pipeline to remove residual impurities or frost. This makes the equipment more flexible to use and also helps to clean the inner wall, preventing impurities from being transported with the liquid hydrogen. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the left-side structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the overall structure of the working components of this utility model;

[0022] Figure 4 This is a schematic cross-sectional view of the working component of this utility model;

[0023] Figure 5 This is a schematic diagram of the exploded structure of the constant temperature component of this utility model;

[0024] Figure 6 This is a schematic diagram of the constant temperature component structure of this utility model;

[0025] Figure 7 This is a schematic diagram of the transmission rod structure of this utility model;

[0026] Figure 8 This is a schematic cross-sectional view of the detection component of this utility model;

[0027] Figure 9 This is a schematic diagram of the cross-sectional structure of the observation window of this utility model;

[0028] Figure 10 This is a schematic diagram of the cross-sectional structure of the catheter of this utility model.

[0029] In the diagram: 1. Valve seat; 2. Working component; 3. Thermostatic component; 4. Detection component; 5. Valve cover; 6. Valve stem; 7. Handwheel; 8. Butterfly plate; 9. Gear 1; 10. Gear 2; 11. Transmission rod; 12. Push rod; 13. Storage compartment; 14. Connecting pipe; 15. Sealing ring; 16. Airbag; 17. Limiting shaft; 18. Moving cover; 19. Cooling net; 20. Manifold; 21. Pressure relief valve; 22. Air ring; 23. Nozzle; 24. Collection cover; 25. Conduit; 26. Water storage rack; 27. Drain pipe; 28. Branch pipe; 29. ​​Housing; 30. Observation window; 31. Movable frame; 32. Limiting plate; 33. Reaction plate. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Please see Figure 1-10 As shown, a double eccentric butterfly valve for a hydrogen receiving station includes a valve seat 1. The valve seat 1 has an internal heat insulation layer and an external heat insulation material coating. Both ends of the valve seat 1 are provided with connection interfaces. A working component 2 is installed on the side of the valve seat 1. A thermostatic component 3 is installed on the inner wall of the valve seat 1. The thermostatic component 3 includes a gear 9. The end of the gear 9 is connected to the working component 2. A gear 10 meshes with the side of the gear 9. The end of the gear 10 is rotatably connected to the inner wall of the valve seat 1. The end of the gear 10 is rotatably connected to the end of the transmission rod 11. The other end of the transmission rod 11 is rotatably connected to the end of the push rod 12. A movable cover 18 is installed on the end of the push rod 12. A storage compartment 13 is slidably connected to the side of the movable cover 18. The storage compartment 13 is installed on the inner wall of the valve seat 1. Three sets of cooling nets 19 are installed on the side of the movable cover 18. The cooling nets 19 are attached to the inner wall of the valve seat 1.

[0032] The detection component 4 is connected to the side of the valve seat 1. The detection component 4 can observe whether there is a leak during the flow of hydrogen.

[0033] To ensure a constant and minimal temperature difference between the front and rear ends of the valve seat 1, during valve opening, the flowing liquid hydrogen enters the interior through the opening of the storage chamber 13 for temporary storage. Subsequently, when the valve stem 6 is rotated to close the flow channel of liquid hydrogen inside the valve seat 1, the rotation of the valve stem 6 drives gear 1 9 and gear 2 10 to rotate together. The rotation of gear 2 10 pulls the end of the connected transmission rod 11, causing the end of the transmission rod 11 to push the push rod 12 to move away from the storage chamber 13. This allows the movable cover 18 connected to the push rod 12 to cover the opening of the storage chamber 13, keeping the interior of the storage chamber 13 sealed and storing the liquid hydrogen inside. At the same time, the cooling net 19 is made of a thermally conductive material, which can transfer low temperature to the contact area between the cooling net 19 and the valve seat 1, thereby ensuring that the temperature inside the valve seat 1 on both sides of the butterfly plate 8 remains consistent. This prevents the sealing ring 15 from deforming significantly due to temperature differences, ensuring that the sealing ring 15 fits snugly against the edge of the butterfly plate 8 and further maintaining the sealing effect.

[0034] As a technical optimization of this utility model, the connection between the end of the transmission rod 11 and the gear 2 10 is located at one-sixth of the central axis of the gear 2 10. During rotation, the gear 2 10 drives the connection end of the transmission rod 11 in a circular motion, enabling the other end of the transmission rod 11 connected to the push rod 12 to push the push rod 12 to achieve reciprocating motion. Limiting shafts 17 are provided on both sides of the push rod 12, and these limiting shafts 17 are installed on the inner wall of the valve seat 1. The limiting shafts 17 are parallel to both sides of the push rod 12, controlling the movement of the push rod 12. The direction serves as a limit, the push rod 12 is inserted into the interior of the storage chamber 13 and the contact part is sealed, the side of the movable cover 18 is embedded in the surface of the storage chamber 13, and the movable cover 18 is set at the upper end of the opening of the storage chamber 13. When the movable cover 18 moves to the upper end of the opening of the storage chamber 13, it seals the liquid hydrogen stored inside the storage chamber 13. When the movable cover 18 moves to the side of the opening of the storage chamber 13, the device is in the open valve state, and the liquid hydrogen transmitted inside the valve seat 1 will be poured into the interior of the storage chamber 13 for temporary storage.

[0035] As a technical optimization of this utility model, the storage chamber 13 stores liquid hydrogen in the working state, and a connecting pipe 14 is installed on one side of the storage chamber 13. A sealing ring 15 passes through the end of the connecting pipe 14, and an airbag 16 is installed on the side of the sealing ring 15. When the cooling net 19 is in contact with the cooling valve seat 1, the high-pressure gas hydrogen inside the storage chamber 13 is squeezed into the sealing ring 15 and finally inflates the inside of the airbag 16, so that the airbag 16 is in a full state and can cooperate with the sealing ring 15 to wrap the side edge of the butterfly plate 8, thereby making the butterfly plate 8 and the inner wall of the valve seat 1 completely sealed, achieving the function of auxiliary sealing and further supporting the sealing effect.

[0036] As a technical optimization of this utility model, each end of the cooling net 19 is connected to a manifold 20, and the end of the manifold 20 is provided with a pressure relief valve 21. The end of the pressure relief valve 21 is fixedly connected to a gas ring 22, and a nozzle 23 is installed on the inner wall of the gas ring 22. During the accumulation of high-pressure hydrogen inside the cooling net 19 in the storage chamber 13 and the cooling net 19, high pressure is generated. When the internal gas pressure reaches the threshold of the pressure relief valve 21, the pressure relief valve 21 opens, and the high-pressure gas passes through the gas ring 22 and is discharged from the port of the nozzle 23. Since the nozzle 23 is obliquely placed inside the gas ring 22, the high-pressure gas blown out by the nozzle 23 will spirally blow along the hollow flow channel inside the valve seat 1 and blow away the impurities on the inner wall of the valve seat 1, ensuring that the inner wall of the valve seat 1 is smooth and preventing the liquid hydrogen from moving with the impurities during the transmission process. At the same time, it also protects the anti-hydrogen embrittlement coating on the inner wall of the valve seat 1.

[0037] As a technical optimization of this utility model, the detection component 4 includes a collection cover 24. The bottom end of the collection cover 24 covers the surface of the valve seat 1. A conduit 25 passes through the top of the collection cover 24. A branch pipe 28 is fixedly connected to the side of the conduit 25. A sleeve 29 is installed at the end of the branch pipe 28. An observation window 30 is installed at the top of the conduit 25. When the valve seat 1 develops internal cracks due to long-term use and hydrogen leaks, the leaked hydrogen gas, due to its own weight being lower than the conventional atmospheric gravity, rises and accumulates at the bottom of the collection cover 24 because the collection cover 24 covers the upper end of the valve seat 1. It then flows into the observation window 30 through the conduit 25. At the same time, because the sleeve 29 covers the outside of the valve cover 5, the hydrogen gas leaking from the valve cover 5 will also be squeezed into the conduit 25 through the branch pipe 28 due to internal pressure. Finally, it is collected and reacted inside the observation window 30, thus realizing the detection process of partial hydrogen leakage.

[0038] As a technical optimization of this utility model, a movable frame 31 is slidably connected to the inner wall of the observation window 30. Limiting plates 32 are fixedly connected to the four corners of the movable frame 31. A reaction plate 33 is fitted inside the movable frame 31. The observation window 30 is made of transparent material and is installed in an ambient temperature environment. Hydrogen gas transmitted by the conduit 25 enters the interior of the observation window 30. At the same time, the reaction plate 33 inside the observation window 30 comes into contact with oxygen. The black copper oxide reacts with the hydrogen gas to produce copper metal and water. Since the reaction plate 33 is originally black, it turns copper-colored after contact with hydrogen gas. Personnel can directly observe the color change of the reaction plate 33 through the observation window 30 to determine whether there is a small-scale hydrogen leak in the overall equipment. During regular inspections, this helps personnel check for hydrogen leaks and ensures the safe use of the equipment.

[0039] As a technical optimization of this utility model, a water storage rack 26 is fixedly connected to the inner wall of the conduit 25, and a drain pipe 27 is installed on the side of the conduit 25. The water generated by the reaction of the reaction plate 33 will slide down the inner wall of the conduit 25 and eventually be collected in the gap between the conduit 25 and the water storage rack 26. The resulting wastewater is eventually discharged into the external environment through the drain pipe 27, thus avoiding the wastewater from directly contacting the surface of the valve seat 1 and causing corrosion to the valve seat 1.

[0040] As a technical optimization of this utility model, the reaction plate 33 is provided with several sets of through holes inside. The interior of the reaction plate 33 is made of copper oxide material. The through hole arrangement of the reaction plate 33 can ensure that the flowing hydrogen can fully contact the surface of the reaction plate 33 and react, and prevent the hydrogen from being discharged into the external environment before the reaction is completely completed.

[0041] As a technical optimization of this utility model, the working component 2 includes a valve cover 5, the bottom end of which is fixedly connected to the top of the valve seat 1. A valve stem 6 is rotatably connected to the inner wall of the valve cover 5. The valve stem 6 is made of a low-temperature nickel-based alloy and can withstand -162°C and Class 1 temperatures for DN600 and above. The valve stem 6 is equipped with a 600 pressure rating and employs electrostatic discharge technology. In low-temperature environments, the medium is prone to static electricity. This electrostatic discharge technology eliminates static electricity, preventing spark discharge and improving the overall safety and reliability of the equipment. A handwheel 7 is located at the top of the valve stem 6, and a butterfly plate 8 is installed on its side. The butterfly plate 8 fits inside the valve seat 1 and adheres to the inner wall of the valve seat 1 when the equipment is closed. Since the butterfly plate 8 is located within the flow channel inside the valve seat 1, rotating the handwheel 7 rotates the valve stem 6, causing the butterfly plate 8 to flip within the flow channel of the valve seat 1, thus opening and closing the valve. The connection between the valve stem 6 and the butterfly plate 8 is located on one side of the butterfly plate 8's central axis, achieving a double eccentric effect. This prevents the butterfly plate 8 from directly contacting the sealing ring 15 during flipping, reducing contact wear and extending its lifespan.

[0042] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0043] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A double eccentric butterfly valve for a hydrogen receiving station, comprising a valve seat (1), wherein the valve seat (1) is internally equipped with a heat insulation layer and externally coated with heat insulation material, and both ends of the valve seat (1) are provided with connection interfaces, and a working component (2) is installed on the side of the valve seat (1), characterized in that: The inner wall of the valve seat (1) is equipped with a thermostatic component (3). The thermostatic component (3) includes a gear one (9). The end of the gear one (9) is connected to the working component (2). The side of the gear one (9) is meshed with a gear two (10). The end of the gear two (10) is rotatably connected to the inner wall of the valve seat (1). The end of the gear two (10) is rotatably connected to the end of the transmission rod (11). The other end of the transmission rod (11) is rotatably connected to the end of the push rod (12). The end of the push rod (12) is equipped with a movable cover (18). The side of the movable cover (18) is slidably connected to a storage compartment (13). The storage compartment (13) is installed on the inner wall of the valve seat (1). The side of the movable cover (18) is equipped with three sets of cooling nets (19). The cooling nets (19) are attached to the inner wall of the valve seat (1). The detection component (4) is connected to the side of the valve seat (1) and can observe whether there is leakage during the flow of hydrogen.

2. The double-eccentric butterfly valve for a hydrogen gas receiving station of claim 1, wherein: The connection between the end of the transmission rod (11) and the gear two (10) is located at one-sixth of the central axis of the gear two (10). Limiting shafts (17) are provided on both sides of the push rod (12), and the limiting shafts (17) are installed on the inner wall of the valve seat (1). The push rod (12) is inserted into the interior of the storage compartment (13), and the contact part is sealed. The side of the movable cover (18) is embedded in the surface of the storage compartment (13).

3. The double-eccentric butterfly valve for a hydrogen gas receiving station of claim 1, wherein: The storage chamber (13) stores liquid hydrogen in the working state, and a connecting pipe (14) is installed on one side of the storage chamber (13). A sealing ring (15) passes through the end of the connecting pipe (14), and an airbag (16) is installed on the side of the sealing ring (15).

4. The dual-eccentric butterfly valve for a hydrogen gas receiving station of claim 1, wherein: The cooling net (19) is connected to a manifold (20) at each end. A pressure relief valve (21) is provided at the end of the manifold (20). An air ring (22) is fixedly connected to the end of the pressure relief valve (21). A nozzle (23) is installed on the inner wall of the air ring (22).

5. The dual-eccentric butterfly valve for a hydrogen gas receiving station of claim 1, wherein: The detection component (4) includes a collection cover (24), the bottom end of which covers the surface of the valve seat (1), a conduit (25) penetrating the top of the collection cover (24), a branch pipe (28) fixedly connected to the side of the conduit (25), a sleeve (29) installed at the end of the branch pipe (28), and an observation window (30) installed at the top of the conduit (25).

6. The dual-eccentric butterfly valve for a hydrogen gas receiving station of claim 5, wherein: The inner wall of the observation window (30) is slidably connected to a movable frame (31), and the four corners of the movable frame (31) are fixedly connected to limit plates (32). A reaction plate (33) is fitted inside the movable frame (31). The observation window (30) is made of transparent material and is installed in an ambient temperature environment.

7. The dual-eccentric butterfly valve for a hydrogen gas receiving station of claim 5, wherein: A water storage rack (26) is fixedly connected to the inner wall of the conduit (25), and a drain pipe (27) is installed on the side of the conduit (25).

8. The dual-eccentric butterfly valve for a hydrogen gas receiving station of claim 6, wherein: The reaction plate (33) has several sets of through holes inside, and the interior of the reaction plate (33) is made of copper oxide material.

9. The dual-eccentric butterfly valve for a hydrogen gas receiving station of claim 1, wherein: The working component (2) includes a valve cover (5), the bottom end of which is fixedly connected to the top of the valve seat (1). A valve stem (6) is rotatably connected to the inner wall of the valve cover (5). A handwheel (7) is provided at the top of the valve stem (6). A butterfly plate (8) is installed on the side of the valve stem (6), and the butterfly plate (8) is fitted inside the valve seat (1). The butterfly plate (8) is attached to the inner wall of the valve seat (1) when the equipment is closed.

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