An ultra-low temperature frictionless disc valve

Abstract

The utility model discloses a kind of ultra-low temperature frictionless disc valves, belong to safety valve technical field, for the technical problem that the rigidity of valve flap is required and sealing is very difficult in prior art exists.The technical scheme of the utility model includes: cam, valve body, valve flap, valve rod, sealing ring and valve seat;The valve body is equipped with axially movable valve seat inside, the valve seat is sealedly connected with valve body by diaphragm, forms static seal structure;One end of the cam is drivingly connected with the operating mechanism of ultra-low temperature frictionless disc valve, the other end is contacted with the valve seat and cooperates, for pushing valve seat axially moves in valve opening and closing process;The valve flap is located in valve body, can rotate around valve rod;The sealing ring is fixed on the sealing surface of valve flap.

Description

Technical Field

[0001] This utility model belongs to the field of safety valve technology, specifically relating to an ultra-low temperature frictionless disc valve. Background Technology

[0002] Cryogenic butterfly valves play a crucial role in the control of cryogenic media. They are widely used in receiving bases and satellite stations for ethylene, liquefied natural gas, and LNG storage tanks, as well as in industrial fields such as air separation equipment and petrochemical tail gas separation equipment.

[0003] In the existing technology, the sealing structure of cryogenic butterfly valves is usually designed as a conical seal. Whether it is a double eccentric or triple eccentric butterfly valve, there is varying degrees of sliding friction during the opening and closing process. Long-term use has a great impact on the sealing surface, and may even directly affect the sealing performance of the valve.

[0004] The existing technology has the following technical problems: 1. The valve seat and valve disc need to be separated when closing or opening, requiring structural innovation.

[0005] 2. When the valve is closed, the force of the medium acts on the valve disc, and an additional preload is applied, requiring the valve disc to have good rigidity. Utility Model Content

[0006] In view of the technical problems of requiring high rigidity of the valve disc and the great difficulty of sealing in the prior art, this utility model provides an ultra-low temperature frictionless disc valve.

[0007] The technical solution adopted in this utility model is as follows: A cryogenic frictionless disc valve includes: a cam, a valve body, a valve disc, a valve stem, a sealing ring, and a valve seat; the valve body has an axially movable valve seat inside, which is sealed to the valve body via a diaphragm to form a static sealing structure; one end of the cam is drivenly connected to the operating mechanism of the cryogenic frictionless disc valve, and the other end is in contact with the valve seat, used to push the valve seat to move axially during valve opening and closing; the valve disc is located inside the valve body and can rotate around the valve stem; the sealing ring is fixed to the sealing surface of the valve disc.

[0008] The beneficial effects of this utility model by adopting the above technical solution are as follows: By setting an axially movable valve seat and using a cam to push the valve seat backward during the opening and closing process, the valve disc rotates in a state of disengagement from the valve seat, fundamentally eliminating the wear and jamming problems caused by sliding friction of the sealing surface in traditional butterfly valves, and achieving truly frictionless operation; at the same time, the valve seat forms a static sealing structure with the valve body through the diaphragm, replacing the easily failed dynamic seal, significantly improving the sealing reliability and service life under ultra-low temperature conditions.

[0009] Furthermore, the aforementioned diaphragm is a corrugated metal diaphragm, made of austenitic stainless steel, Inconel nickel alloy, or nickel-based high-temperature alloy.

[0010] The beneficial effects of this utility model by adopting the above technical solution are as follows: This utility model adopts a metal corrugated diaphragm and selects materials with excellent low-temperature toughness and fatigue resistance, such as austenitic stainless steel, Inconel nickel alloy or nickel-based high-temperature alloy, to ensure that the diaphragm can maintain structural integrity and sealing stability under frequent axial movement and extreme low temperature environment, effectively prevent leakage caused by material embrittlement or fatigue fracture, and improve the long-term operational reliability of the valve.

[0011] Furthermore, a guide structure is provided between the valve seat and the valve body as described above.

[0012] The beneficial effects of this utility model by adopting the above technical solution are as follows: By setting a guide structure between the valve seat and the valve body, this utility model effectively constrains the valve seat to move only along the axial direction, avoiding deviation, jamming or uneven force during movement, thereby ensuring the smoothness of valve seat movement and repeatability of positioning accuracy, reducing additional stress on the diaphragm, and improving overall movement reliability and sealing consistency.

[0013] Furthermore, the aforementioned guiding structure includes a guiding portion and a guiding groove. The guiding portion is evenly distributed around the valve seat and is integrally designed with the valve seat. The guiding groove is located inside the valve body. The beneficial effects of this utility model by adopting the above technical solution are as follows: This utility model designs the guide part to be integrally formed with the valve seat and evenly distributed around it. Together with the guide groove in the valve body, it forms a multi-point, symmetrical nested guide structure, which not only improves the guide stiffness and motion stability, but also simplifies the assembly process, reduces the processing cost, and avoids the risk of failure of additional guide parts at low temperatures.

[0014] Furthermore, a return spring is provided at the end of the valve seat away from the valve disc.

[0015] The beneficial effects of this utility model by adopting the above technical solution are as follows: the return spring of this utility model can actively push the valve seat to return to its original position when the valve is closed, ensuring that the sealing ring and the valve seat fit tightly together, effectively compensating for the gap caused by low temperature shrinkage, wear or assembly errors, improving the stability and reliability of the sealing pre-tightening force, and preventing internal leakage.

[0016] Furthermore, the contact surface between the cam and the valve seat is provided with a torque-reducing pulley.

[0017] The beneficial effects of this utility model by adopting the above technical solution are as follows: This utility model sets a torque-reducing pulley on the contact surface between the cam and the valve seat, which transforms the original sliding friction into rolling friction, significantly reducing the operating torque required for valve opening and closing, reducing the load on the actuator, and making the operation more convenient and smooth. It is especially suitable for cryogenic valves with large diameter or high sealing pressure.

[0018] Furthermore, the aforementioned torque-reducing pulley is a roller or a self-lubricating bearing.

[0019] The beneficial effects of this utility model by adopting the above technical solution are as follows: This utility model uses rollers or self-lubricating bearings as torque-reducing pulleys, which not only further reduces frictional resistance, but also enables long-term stable operation in ultra-low temperature environments without external lubrication, avoiding jamming problems caused by lubrication failure, and improving the durability and maintenance convenience of the valve.

[0020] Furthermore, the sealing ring described above is made of reinforced polytetrafluoroethylene, and the cross-sectional shape of the sealing ring is O-shaped, D-shaped, or lip-shaped.

[0021] The beneficial effects of this utility model by adopting the above technical solution are as follows: This utility model selects reinforced polytetrafluoroethylene as the sealing ring material, which has excellent low temperature performance, chemical stability and wear resistance. Combined with various cross-sectional shapes such as O-type, D-type or lip type, it can adapt to the sealing requirements under different pressure and temperature conditions, and improve the adaptability and reliability of the seal.

[0022] Furthermore, the valve body described above is provided with a sandwich structure, the interior of which is either a vacuum or filled with heat-insulating material.

[0023] The beneficial effects of this utility model by adopting the above technical solution are as follows: The valve body of this utility model is provided with a sandwich structure and vacuumed or filled with heat insulation material, which effectively blocks the transmission of external heat, reduces the loss of cold energy, prevents frost and ice from forming on the outside of the valve body, ensures operational safety, and at the same time maintains the stability of the internal temperature field of the valve, avoiding structural deformation or sealing failure caused by thermal stress.

[0024] Furthermore, the aforementioned operating mechanism is a manual handle, an electric actuator, a pneumatic actuator, or a hydraulic actuator.

[0025] The beneficial effects of this utility model by adopting the above technical solution are as follows: This utility model supports multiple operating mechanisms such as manual handle, electric, pneumatic or hydraulic, so that the valve can be flexibly applied to different scenarios such as on-site manual operation, remote control or automated system integration, thereby improving the versatility and engineering applicability of the valve.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. By setting an axially movable valve seat and using a cam to push the valve seat backward during the opening and closing process, the valve disc rotates in a state of disengagement from the valve seat, fundamentally eliminating the wear and jamming problems caused by sliding friction of the sealing surface in traditional butterfly valves, and achieving truly frictionless operation; at the same time, the valve seat forms a static sealing structure with the valve body through the diaphragm, replacing the easily failed dynamic seal, significantly improving the sealing reliability and service life under ultra-low temperature conditions.

[0027] 2. By setting a guide structure between the valve seat and the valve body, the valve seat is effectively constrained to move only along the axial direction, avoiding deviation, jamming or uneven force during movement, thereby ensuring the smoothness of valve seat operation and repeatability of positioning accuracy, reducing additional stress on the diaphragm, and improving overall movement reliability and sealing consistency.

[0028] 3. This utility model sets a torque-reducing pulley on the contact surface between the cam and the valve seat, which transforms the original sliding friction into rolling friction, significantly reducing the operating torque required for valve opening and closing, reducing the load on the actuator, and making operation easier and smoother. It is especially suitable for cryogenic valves with large diameter or high sealing pressure.

[0029] 4. The valve body of this utility model is equipped with a sandwich structure and is vacuumed or filled with heat insulation material, which effectively blocks the introduction of external heat, reduces cold loss, prevents frost and ice from forming on the outside of the valve body, ensures operational safety, and maintains a stable internal temperature field of the valve, avoiding structural deformation or sealing failure caused by thermal stress. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a structural schematic diagram of an ultra-low temperature frictionless disc valve according to Embodiment 1 of this utility model; Figure 2 yes Figure 1 An enlarged structural diagram of part A.

[0031] Reference numerals in the attached diagram: 1. Valve body; 2. Valve stem; 3. Valve disc; 4. Sealing ring; 5. Valve seat; 6. Return spring. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0034] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0035] like Figure 1 As shown, this embodiment provides a cryogenic frictionless disc valve, including: a cam, a valve body 1, a valve disc 3, a valve stem 2, a sealing ring 4, and a valve seat 5; the valve body 1 is provided with an axially movable valve seat 5, which is sealed to the valve body 1 through a diaphragm to form a static sealing structure; one end of the cam is drivenly connected to the operating mechanism of the cryogenic frictionless disc valve, and the other end is in contact with the valve seat 5, used to push the valve seat 5 to move axially during the opening and closing of the valve; the valve disc 3 is located inside the valve body 1 and can rotate around the valve stem 2; the sealing ring 4 is fixed to the sealing surface of the valve disc 3.

[0036] In summary, this utility model, by setting an axially movable valve seat 5 and utilizing a cam to push the valve seat 5 backward during the opening and closing process, allows the valve disc 3 to rotate while disengaged from the valve seat 5. This fundamentally eliminates the wear and jamming problems caused by sliding friction of the sealing surface in traditional butterfly valves, achieving truly frictionless operation. At the same time, the valve seat 5 forms a static sealing structure with the valve body 1 through a diaphragm, replacing the easily failed dynamic seal and significantly improving the sealing reliability and service life under ultra-low temperature conditions.

[0037] Optionally, the diaphragm is a corrugated metal diaphragm made of austenitic stainless steel, Inconel nickel alloy, or nickel-based high-temperature alloy.

[0038] In summary, this utility model uses a metal corrugated diaphragm and selects materials with excellent low-temperature toughness and fatigue resistance, such as austenitic stainless steel, Inconel nickel alloy, or nickel-based high-temperature alloy, to ensure that the diaphragm can maintain structural integrity and sealing stability under frequent axial movement and extreme low-temperature environments, effectively preventing leakage caused by material embrittlement or fatigue fracture, and improving the long-term operational reliability of the valve.

[0039] Optionally, a guide structure is provided between the valve seat 5 and the valve body 1.

[0040] In summary, by setting a guide structure between the valve seat 5 and the valve body 1, this utility model effectively constrains the valve seat 5 to move only along the axial direction, avoiding deviation, jamming or uneven force during movement, thereby ensuring the smoothness of the valve seat 5's movement and the accuracy of repeatable positioning, reducing the additional stress on the diaphragm, and improving the overall movement reliability and sealing consistency.

[0041] Optionally, the guide structure includes a guide portion and a guide groove. The guide portion is evenly distributed around the valve seat 5 and is integrally designed with the valve seat 5. The guide groove is disposed inside the valve body 1. In summary, this utility model designs the guide part as an integral part of the valve seat 5 and evenly distributed around it. Together with the guide groove in the valve body 1, it forms a multi-point, symmetrical nested guide structure, which not only improves the guide stiffness and motion stability, but also simplifies the assembly process, reduces processing costs, and avoids the risk of failure of additional guide parts at low temperatures.

[0042] Optionally, a return spring 6 is provided at the end of the valve seat 5 away from the valve disc 3.

[0043] In summary, the reset spring 6 of this utility model can actively push the valve seat 5 to reset when the valve is closed, ensuring that the sealing ring 4 and the valve seat 5 fit tightly, effectively compensating for gaps caused by low temperature shrinkage, wear or assembly errors, improving the stability and reliability of the sealing preload, and preventing internal leakage.

[0044] Optionally, the contact surface between the cam and the valve seat 5 is provided with a torque-reducing pulley.

[0045] In summary, this utility model provides a torque-reducing pulley on the contact surface between the cam and the valve seat 5, which transforms the original sliding friction into rolling friction, significantly reducing the operating torque required for valve opening and closing, reducing the load on the actuator, and making operation easier and smoother. It is especially suitable for cryogenic valves with large diameter or high sealing pressure.

[0046] Optionally, the torque-reducing pulley is a roller or a self-lubricating bearing.

[0047] In summary, this utility model uses rollers or self-lubricating bearings as torque-reducing pulleys, which not only further reduces frictional resistance but also enables long-term stable operation in ultra-low temperature environments without external lubrication, avoiding jamming problems caused by lubrication failure and improving the durability and ease of maintenance of the valve.

[0048] Optionally, the sealing ring 4 is made of reinforced polytetrafluoroethylene, and the cross-sectional shape of the sealing ring 4 is O-shaped, D-shaped, or lip-shaped.

[0049] In summary, this utility model selects reinforced polytetrafluoroethylene as the sealing ring material, which has excellent low-temperature performance, chemical stability and wear resistance. Combined with various cross-sectional shapes such as O-type, D-type or lip type, it can adapt to the sealing requirements under different pressure and temperature conditions, and improve the adaptability and reliability of the seal.

[0050] Optionally, the valve body 1 is provided with a sandwich structure, the interior of which is either a vacuum or filled with heat-insulating material.

[0051] In summary, the valve body 1 of this utility model is provided with a sandwich structure and is vacuumed or filled with heat insulation material, which effectively blocks the introduction of external heat, reduces the loss of cold energy, prevents frost and ice from forming on the outside of the valve body 1, ensures operational safety, and at the same time maintains the stability of the internal temperature field of the valve, avoiding structural deformation or sealing failure caused by thermal stress.

[0052] Optionally, the operating mechanism is a manual handle, an electric actuator, a pneumatic actuator, or a hydraulic actuator.

[0053] In summary, this utility model supports multiple operating mechanisms such as manual handles, electric, pneumatic, or hydraulic, enabling the valve to be flexibly applied to different scenarios such as on-site manual operation, remote control, or automated system integration, thereby improving the valve's versatility and engineering applicability.

[0054] In cryogenic conditions (such as liquid nitrogen -196℃, liquid oxygen, or LNG environments), this invention introduces an axially movable valve seat 5 and an asymmetric cam drive mechanism, decomposing the original "rotation + friction" opening and closing process into two independent actions: Axial disengagement: The cam profile pushes the valve seat 5 backward, causing the sealing surfaces to separate; Frictionless rotation: After the sealing surface is completely separated, the valve disc 3 is driven to rotate to complete the switching action.

[0055] Meanwhile, the movement of valve seat 5 is sealed by a metal diaphragm, forming a static sealing structure, which avoids the dynamic sealing failure problem of traditional packing or O-rings at low temperatures, and fundamentally improves sealing reliability.

[0056] 1. Initial state (valve closed): The valve seat 5 is in the front position under the action of the return spring 6 (or cam return), and its sealing surface is tightly fitted with the sealing ring 4 on the valve disc 3; The diaphragm is under slight pre-compression to ensure the sealing integrity of the moving part of the valve seat 5; The cam is at its initial angle, and its lowest point is in contact with the valve seat 5.

[0057] 2. Push valve seat 5 backward (disengage the seal): An operating mechanism (such as a handle or electric actuator) drives the cam to begin rotating; The asymmetrical profile of the cam gradually rises, pushing the valve seat 5 to move backward along the axial direction by about 1 mm; During this process, the valve seat 5 slides smoothly in the guide groove through the guide part to ensure linearity of movement; As the valve seat 5 moves backward, the sealing ring 4 on the valve disc 3 completely separates from the sealing surface of the valve seat 5, forming a non-contact gap. The diaphragm then stretches elastically to maintain a seal.

[0058] 3. Rotary valve disc 3 (frictionless opening and closing): When the valve seat 5 retracts to its position, the cam profile transitions to the drive section, driving the valve stem 2 to rotate through the linkage structure (or independent transmission); The valve disc 3 rotates 90° around the valve stem 2, from the "closed" position to the "fully open" position; Since the valve disc 3 and the valve seat 5 are not in contact at this time, there is no friction or wear during the entire rotation process, and the operating torque is extremely low.

[0059] 4. Valve closing procedure (executed in reverse): Valve disc 3 first rotates back to the closed position; The cam continues to rotate, its profile descends, releasing the thrust on valve seat 5; The return spring 6 (or the cam return surface) pushes the valve seat 5 forward, re-pressing the valve disc 3 and sealing ring 4; The sealing surfaces are restored to a tight fit, achieving a reliable seal; The diaphragm returns to its original state, completing one switching cycle.

[0060] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions and improvements made by those skilled in the art within the spirit and principles of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A cryogenic frictionless disc valve, characterized in that, include: The valve body comprises a cam, valve body, valve disc, valve stem, sealing ring, and valve seat. The valve body contains an axially movable valve seat, which is sealed to the valve body via a diaphragm to form a static seal. One end of the cam is connected to the operating mechanism of the cryogenic frictionless disc valve, and the other end contacts and engages with the valve seat, used to push the valve seat axially during valve opening and closing. The valve disc is located within the valve body and can rotate around the valve stem. The sealing ring is fixed to the sealing surface of the valve disc.

2. The cryogenic frictionless disc valve according to claim 1, characterized in that, The diaphragm is a corrugated metal diaphragm made of austenitic stainless steel, Inconel nickel alloy, or nickel-based high-temperature alloy.

3. The cryogenic frictionless disc valve according to claim 1, characterized in that, A guide structure is provided between the valve seat and the valve body.

4. The cryogenic frictionless disc valve according to claim 3, characterized in that, The guiding structure includes a guiding part and a guiding groove. The guiding part is evenly arranged around the valve seat and is designed integrally with the valve seat. The guiding groove is located inside the valve body.

5. The cryogenic frictionless disc valve according to claim 1, characterized in that, A return spring is provided at the end of the valve seat away from the valve disc.

6. The cryogenic frictionless disc valve according to claim 1, characterized in that, The contact surface between the cam and the valve seat is provided with a torque-reducing pulley.

7. The cryogenic frictionless disc valve according to claim 6, characterized in that, The torque-reducing pulley is a roller or a self-lubricating bearing.

8. The cryogenic frictionless disc valve according to claim 1, characterized in that, The sealing ring is made of reinforced polytetrafluoroethylene, and its cross-sectional shape is O-shaped, D-shaped, or lip-shaped.

9. The cryogenic frictionless disc valve according to claim 1, characterized in that, The valve body is provided with a sandwich structure, the interior of which is either a vacuum or filled with heat-insulating material.

10. The cryogenic frictionless disc valve according to claim 1, characterized in that, The operating mechanism is a manual handle, an electric actuator, a pneumatic actuator, or a hydraulic actuator.

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