Nuclear power high-temperature-resistant closed valve

Abstract

The utility model discloses a nuclear power high-temperature-resistant closed valve which comprises an electric actuator and further comprises a driving shaft and a driven shaft, and the electric actuator is in transmission connection with the driving shaft. A left combiner is fixed to the end, away from the electric actuator, of the driving shaft, a right combiner is fixed to the end, close to the driving shaft, of the driven shaft, and the left combiner and the right combiner are fixedly connected. The driven shaft penetrates through the valve body and is rotationally connected with the valve body, and the driven shaft is fixedly connected with the valve plate. The valve plate is located in the valve body and connected with the valve seat in the valve body in a sealed mode. The driven shaft is sleeved with a shaft sleeve, and the shaft sleeve is rotationally connected into the lower support and the upper support. The lower support and the upper support are fixed to the two sides of the valve body respectively. The nuclear power air valve solves the problem that a common nuclear power air valve cannot meet the high-temperature use requirement.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves and relates to a nuclear power high-temperature resistant sealed valve. Background Art

[0002] An air volume regulating valve (hereinafter referred to as "air valve") is an indispensable central end fitting in the ventilation, air conditioning and air purification projects of industrial plants and civil buildings. Generally, in the air conditioning and ventilation system pipelines, it is used to regulate the air volume of the pipeline and is also used for the mixing regulation of fresh air and return air.

[0003] Nuclear power plants will formulate corresponding technical specifications for the air valves to be purchased in their own projects based on the industry standards of nuclear power air valves. This specification will have more stringent requirements and regulations on a series of aspects such as the raw material selection, processing technology, quality assurance system, and valve performance of the air valves. Therefore, the design, manufacturing, etc. of nuclear power air valves are much more difficult than those of other types of air valves.

[0004] The air valve mainly consists of several parts such as a valve body, a valve plate, a transmission structure, and an actuator. The actuator transmits torque to the valve plate through a connecting shaft to control the opening angle of the valve plate, realizing the regulation and control of the air volume, and providing a suitable and satisfactory air environment for the equipment and personnel in the served area.

[0005] Ordinary nuclear power air valves cannot meet the requirements for high-temperature use. After the ambient working condition temperature is greater than 200 °C, the equipment performance of conventional nuclear power air valves is no longer reliable. The high-temperature state for a long time will cause the overall temperature of the valve to rise, resulting in changes in its internal structure, making it difficult to ensure the sealing performance, and the heat will be transmitted to the electric actuator through the transmission structure of the valve, which may cause the actuator to malfunction and even damage the circuit, leading to an explosion, causing irreversible damage to the nuclear power plant and casualties. Therefore, this application discloses a valve transmission structure that can operate reliably in a high-temperature environment, solving the problem of the HVAC design and construction in the special working condition space of nuclear power plants. Summary of the Invention

[0006] In order to achieve the above object, the utility model provides a nuclear power high-temperature resistant sealed valve, which solves the problem that ordinary nuclear power air valves cannot meet the requirements for high-temperature use.

[0007] To solve the above technical problems, the technical solution adopted by the present utility model is a nuclear power high-temperature resistant sealed valve, which includes an electric actuator, and also includes a driving shaft and a driven shaft. The electric actuator is in transmission connection with the driving shaft; a left coupling is fixed at one end of the driving shaft away from the electric actuator, and a right coupling is fixed at one end of the driven shaft close to the driving shaft. The left coupling and the right coupling are fixedly connected to each other; the driven shaft penetrates through the valve body and is rotatably connected with the valve body, and the driven shaft is fixedly connected with the valve plate; the valve plate is located inside the valve body and is sealingly connected with the valve seat inside the valve body; a shaft sleeve is sleeved on the driven shaft, and the shaft sleeve is respectively rotatably connected in the lower support and the upper support; the lower support and the upper support are respectively fixed on both sides of the valve body.

[0008] Further, thrust bearings are fixed at both ends of the driven shaft; the thrust bearings are respectively located in the lower socket and the upper socket, and the upper socket is fixedly connected with one end of the upper support away from the valve body, and the lower socket is fixedly connected with one end of the lower support away from the valve body; a bearing gland is fixed at one end of the upper socket away from the upper support, a bottom cover is fixed at one end of the lower socket away from the lower support, and both the lower socket and the upper socket are sleeved on the driven shaft.

[0009] Further, a heat insulation pad is arranged between the left coupling and the right coupling.

[0010] Further, composite packing is filled between the driven shaft and the lower support and the upper support respectively. Packing glands are fixed at one end of the lower support away from the driven shaft and one end of the upper support away from the driven shaft, and the packing glands are sleeved on the driven shaft.

[0011] Further, a rear positioning plate is closely attached to one end of the driven shaft away from the driving shaft, and the rear positioning plate is fixedly connected with the bottom cover through an adjusting bolt; a compression ring is arranged between the rear positioning plate and the bottom cover.

[0012] Further, the valve plate and the valve seat are sealed by a composite metal sealing ring. The composite metal sealing ring is fixed on the valve plate through a pressing plate, and a flexible graphite gasket is arranged between the pressing plate and the composite metal sealing ring.

[0013] Further, a valve bracket is fixed on the outer side of the valve body.

[0014] Further, welding grooves are left at both ends of the valve body.

[0015] Further, the outer side of the valve body is wrapped with an asbestos fiber board heat insulation layer.

[0016] The beneficial effects of the present utility model are:

[0017] 1. The present utility model adopts a coupling type coupling design, which effectively blocks temperature conduction and has low torque loss.

[0018] 2. The utility model adopts a bushing + thrust bearing design, which can meet various installation methods of the valve in vertical and horizontal directions.

[0019] 3. The utility model adopts a variety of high-temperature resistant materials such as heat insulation pads and composite packings, ensuring the operation reliability under high-temperature conditions.

[0020] 4. The utility model adopts a rear positioning plate + adjustable pressing ring, ensuring the assembly reliability of this complex structure and reducing the requirements for machining accuracy and assembly accuracy through ingenious design.

[0021] 5. The sealing pair at the valve plate of the utility model adopts a structure of composite metal sealing ring + graphite gasket, ensuring the sealing performance under high-temperature conditions and achieving the airtight function.

[0022] 6. An asbestos fiber board insulation layer is added to the outer layer of the valve body of the utility model to prevent the high-temperature valve body from being exposed outside, creating convenient conditions for the maintenance of workers and the replacement of vulnerable parts.

[0023] 7. The valve body of the utility model can be directly welded to the on-site pipeline without adding mating flanges and gaskets. At the same time, a valve bracket is provided and connected to the on-site wall through bolts, reducing the load of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is the front view of the nuclear power high-temperature resistant airtight valve according to the embodiment of the present utility model.

[0026] Figure 2 It is the left view of the nuclear power high-temperature resistant airtight valve according to the embodiment of the present utility model.

[0027] Figure 3 It is the schematic diagram of the internal structure when the nuclear power high-temperature resistant airtight valve according to the embodiment of the present utility model is viewed from above.

[0028] In the figure, 1. Electric actuator, 2. Driving shaft, 3. Left coupling, 4. Heat insulation pad, 5. Right coupling, 6. Thrust bearing, 7. Packing gland, 8. Valve plate, 9. Driven shaft, 10. Rear positioning plate, 11. Compression ring, 12. Adjusting bolt, 13. Composite packing, 14. Bush, 15. Lower adapter, 16. Bottom cover, 17. Lower support, 18. Upper support, 19. Upper adapter, 20. Bearing gland, 21. Composite metal sealing ring, 22. Flexible graphite gasket, 23. Pressure plate, 24. Valve seat, 25. Valve body, 26. Asbestos fiber board heat insulation layer, 27. Valve bracket. Detailed implementation mode

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] As Figures 1 to 3 shown, the present invention provides a nuclear power high-temperature resistant sealed valve, which includes an electric actuator 1, and the electric actuator 1 is in transmission connection with a driving shaft 2; One end of the driving shaft 2 away from the electric actuator 1 is fixedly connected with a left coupling 3 by key connection, one end of the driven shaft 9 close to the driving shaft 2 is fixedly connected with a right coupling 5 by key connection, and the left coupling 3 and the right coupling 5 are fixedly connected by bolts; The driven shaft 9 penetrates through the valve body 25 and is rotatably connected with the valve body 25, and the driven shaft 9 is fixedly connected with the valve plate 8; The valve plate 8 is located inside the valve body 25 and plays a role in isolating the medium; A bush 14 is sleeved on the driven shaft 9, and the bush 14 is respectively rotatably connected in the lower support 17 and the upper support 18; The lower support 17 and the upper support 18 are respectively fixed on both sides of the valve body 25; Thrust bearings 6 are fixed at both ends of the driven shaft 9; The thrust bearings 6 are respectively located in the lower adapter 15 and the upper adapter 19, and the upper adapter 19 is fixedly connected with one end of the upper support 18 away from the valve body 25, and the lower adapter 15 is fixedly connected with one end of the lower support 17 away from the valve body 25; A bearing gland 20 is fixed at one end of the upper adapter 19 away from the upper support 18, a bottom cover 16 is fixed at one end of the lower adapter 15 away from the lower support 17, the lower adapter 15 and the upper adapter 19 are both sleeved on the driven shaft 9, and the bearing gland 20 and the bottom cover 16 respectively play a limiting role on the corresponding thrust bearings 6; A heat insulation pad 4 is arranged between the left coupling 3 and the right coupling 5 for heat insulation. In the present invention, thrust bearings 6 and bushes 14 are installed at both ends of the driven shaft, which can ensure that the valve can operate normally under the working conditions of horizontal installation and vertical installation, and ensure the coaxiality of the installation and positioning of the driven shaft 9, and improve the rotation flexibility of the driven shaft 9.

[0031] In some embodiments, composite packing 13 is filled between the driven shaft 9 and the lower support 17 and the upper support 18. Packing glands 7 are fixed to one end of the lower support 17 away from the driven shaft 9 and one end of the upper support 18 away from the driven shaft 9. The packing glands 7 are sleeved on the driven shaft 9. The packing glands 7 are used to press the composite packing 13 to play a limiting role. Both ends of the valve body 25 are welded to the on-site pipeline. There may be high-temperature gas in the pipeline, and most of the valves are made of metal materials with good thermal conductivity. The temperature will mainly conduct heat out through the driven shaft 9, and the composite packing 13 will be affected by the heat conducted out by the driven shaft 9. The composite packing 13 made of graphite asbestos material is adopted in the utility model to replace the conventional rubber parts, which can withstand high temperature, play a sealing role in preventing gas leakage, and the graphite material on the surface has a lubricating function to ensure the rotational flexibility of the driven shaft 9.

[0032] In some embodiments, a rear positioning plate 10 is closely attached to one end of the driven shaft 9 away from the driving shaft 2. The rear positioning plate 10 is fixedly connected to the bottom cover 16 through an adjusting bolt 12; a pressing ring 11 is arranged between the rear positioning plate 10 and the bottom cover 16. There are many transmission structure parts in the high-temperature valve and the shaft is relatively long, so the machining accuracy and assembly requirements for the shaft are relatively high. In order to reduce the above requirements, the rear positioning plate 10 of the utility model is installed at the end of the driven shaft 9, which can prevent the driven shaft 9 from generating axial movement towards the electric actuator 1 and play a one-way positioning role; on the other hand, by adjusting the extension length of the adjusting bolt 12, an axially adjustable range can be given to the pressing ring 11, and then an axial adjustment amount can be given to the driven shaft 9 to prevent the phenomenon that the shaft shoulder of the driven shaft 9 abuts against the thrust bearing 6 due to machining accuracy problems. In addition, the pressing ring 11 also plays a role in preventing the driven shaft 9 from generating axial movement in the direction opposite to the electric actuator 1. Combining the above-mentioned rear positioning plate 10 to prevent the driven shaft 9 from generating axial movement in the direction of the electric actuator 1, two-way positioning of the driven shaft 9 can be realized.

[0033] In some embodiments, the valve plate 8 and the valve seat 24 are sealed by a composite metal sealing ring 21. The composite metal sealing ring 21 is fixed to the valve plate 8 through a pressing plate 23. A flexible graphite gasket 22 is arranged between the pressing plate 23 and the composite metal sealing ring 21. The composite metal sealing ring 21 can maintain the structural stability at high temperature, the surface of the structure is smooth and has strong ductility; it is closely attached to the valve seat 24 to play a sealing function and isolate high-temperature gas and radioactive gas. By tightening the bolts at the pressing plate 23, the composite metal sealing ring 21 and the flexible graphite gasket 22 are fastened; the flexible graphite gasket 22 has a stable structure at high temperature and can prevent the medium gas from leaking through the gap between the pressing plate 23 and the composite metal sealing ring 21 under high pressure, ensuring the reliability of the seal.

[0034] In some embodiments, a valve bracket 27 is fixed outside the valve body 25. The valve bracket 27 is used to connect with the wall around the pipeline, enhancing the stability of the entire valve installation and reducing the bearing pressure of the pipeline on the valve.

[0035] In some embodiments, welding grooves are left at both ends of the cylinder of the valve body 25, which can be directly welded to the pipeline used on-site, avoiding the use of the conventional connection method of mating flanges + flange gaskets, preventing the leakage of harmful gases caused by the failure of the flange gasket at high temperatures; it also avoids the construction difficulties caused by tightening or disassembling the mating flanges and the valve with bolts at high temperatures. The asbestos fiber board insulation layer 26 has good heat insulation performance and is soft in texture. After the valve and the on-site pipeline are installed, the asbestos fiber board insulation layer 26 is wrapped around the outer peripheral surface of the cylinder of the valve body 25, which can prevent the valve after heating from causing high-temperature damage to maintenance and installation personnel, and can perform maintenance or adjustment on components such as the electric actuator 1, the left coupling 3, and the right coupling 5 under normal closed conditions.

[0036] The working process of the present utility model is as follows:

[0037] After the electric actuator 1 receives an opening or closing signal, it outputs torque to drive the drive shaft 2 to rotate in the corresponding direction. The drive shaft 2 is connected to the driven shaft 9 through the left coupling 3 and the right coupling 5, and the torque of the electric actuator 1 can be transmitted to the driven shaft 9 to drive the valve plate 8 to rotate, executing the opening or closing command of the valve. Under high-temperature operating conditions, through the composite packing 13 and the heat insulation pad 4, the heat conduction effect inside the valve can be effectively reduced, ensuring the service performance of the internal vulnerable parts and the safe operating temperature of the electric actuator.

[0038] Each embodiment in this specification is described in a related manner. The same or similar parts among the embodiments can be referred to each other, and the key points of each embodiment are the differences from other embodiments.

[0039] The above are only the preferred embodiments of the present utility model and are not intended to limit the protection scope of the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model are included in the protection scope of the present utility model.

Claims

1. A nuclear power high-temperature resistant sealed valve, comprising an electric actuator (1), characterized in that, It also includes a driving shaft (2) and a driven shaft (9), and the electric actuator (1) is in transmission connection with the driving shaft (2); a left coupling (3) is fixed to one end of the driving shaft (2) away from the electric actuator (1), a right coupling (5) is fixed to one end of the driven shaft (9) close to the driving shaft (2), and the left coupling (3) is fixedly connected to the right coupling (5); the driven shaft (9) penetrates through the valve body (25) and is rotatably connected to the valve body (25), and the driven shaft (9) is fixedly connected to the valve plate (8); the valve plate (8) is located inside the valve body (25) and is in sealed connection with a valve seat (24) inside the valve body (25); a shaft sleeve (14) is sleeved on the driven shaft (9), and the shaft sleeve (14) is respectively rotatably connected in a lower support (17) and an upper support (18); the lower support (17) and the upper support (18) are respectively fixed on both sides of the valve body (25).

2. The nuclear power high-temperature resistant hermetic valve according to claim 1, wherein Thrust bearings (6) are fixed to both ends of the driven shaft (9); the thrust bearings (6) are respectively located in a lower socket (15) and an upper socket (19), and the upper socket (19) is fixedly connected to one end of the upper support (18) away from the valve body (25), and the lower socket (15) is fixedly connected to one end of the lower support (17) away from the valve body (25); a bearing gland (20) is fixed to one end of the upper socket (19) away from the upper support (18), a bottom cover (16) is fixed to one end of the lower socket (15) away from the lower support (17), and both the lower socket (15) and the upper socket (19) are sleeved on the driven shaft (9).

3. A nuclear power high-temperature resistant sealed valve according to claim 1, characterized in that, A heat insulation pad (4) is arranged between the left coupling (3) and the right coupling (5).

4. A nuclear power high-temperature resistant hermetic valve according to claim 1, characterized in that, Composite packing (13) is filled between the driven shaft (9) and the lower support (17) and between the driven shaft (9) and the upper support (18), and packing glands (7) are fixed to one end of the lower support (17) away from the driven shaft (9) and one end of the upper support (18) away from the driven shaft (9), and the packing glands (7) are sleeved on the driven shaft (9).

5. The nuclear power high-temperature resistant hermetic valve according to claim 2, characterized in that, A rear positioning plate (10) is closely attached to one end of the driven shaft (9) away from the driving shaft (2), and the rear positioning plate (10) is fixedly connected to the bottom cover (16) through an adjusting bolt (12); a compression ring (11) is arranged between the rear positioning plate (10) and the bottom cover (16).

6. The nuclear power high-temperature resistant hermetic valve according to claim 1, wherein The valve plate (8) and the valve seat (24) are sealed through a composite metal sealing ring (21), the composite metal sealing ring (21) is fixed to the valve plate (8) through a pressing plate (23), and a flexible graphite gasket (22) is arranged between the pressing plate (23) and the composite metal sealing ring (21).

7. A nuclear power high-temperature resistant sealed valve according to claim 1, characterized in that, A valve bracket (27) is fixed to the outside of the valve body (25).

8. A nuclear power high-temperature resistant hermetic valve according to claim 1, characterized in that, Welding grooves are left at both ends of the valve body (25).

9. A nuclear power high-temperature resistant hermetic valve according to claim 1, characterized in that, The outside of the valve body (25) is wrapped with an asbestos fiber board heat insulation layer (26).

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