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CN-121977107-A - Eccentric adjustable flow device for nuclear power station

CN121977107ACN 121977107 ACN121977107 ACN 121977107ACN-121977107-A

Abstract

The application relates to an eccentric adjustable flow device for a nuclear power station, which relates to the technical field of valves and comprises a valve body formed by fixedly connecting a first fixed plate and a second fixed plate through a connecting piece, wherein the eccentric positions of the first fixed plate and the second fixed plate are correspondingly provided with fixed holes, the opposite inner side end surfaces are respectively provided with a flow limiting cavity, the first flow limiting plate and the second flow limiting plate with flow limiting holes are respectively and rotatably installed in the cavities, a synchronous transmission mechanism for driving the first flow limiting plate and the second flow limiting plate to reversely and synchronously rotate and a multiple dynamic sealing system for sealing the valve body are also arranged, the synchronous transmission mechanism comprises a gear ring part, an adjusting gear and the like, and the multiple dynamic sealing system comprises a plurality of composite sealing rings. The application can effectively regulate and limit the flow of the fluid of the nuclear power station, ensures the tightness of the device through the multiple dynamic sealing system and improves the reliability and the stability of the device.

Inventors

  • Lin tianqi
  • LIN ZIYI
  • YANG WEI
  • LIN YUANWEN
  • Pan Zhouyuan
  • HUANG MIHONG
  • ZHENG DEWEI

Assignees

  • 浙江苍南仪表集团东星能源科技有限公司

Dates

Publication Date
20260505
Application Date
20260226

Claims (8)

  1. 1. The eccentric adjustable flow device for the nuclear power station comprises a valve body, wherein the valve body is formed by fixedly connecting a first fixing plate (1 a) and a second fixing plate (1 b) through a connecting piece, a first fixing hole (6) and a second fixing hole (6) are respectively formed in eccentric positions of the first fixing plate (1 a) and the second fixing plate (1 b) correspondingly, and the eccentric adjustable flow device is characterized in that: The opposite inner side end surfaces of the first fixing plate (1 a) and the second fixing plate (1 b) are respectively provided with a current limiting cavity (5), and the first current limiting plate (2 a) and the second current limiting plate (2 b) are respectively and rotatably arranged in the current limiting cavities (5); Limiting holes (7) which are matched with the fixing holes (6) in shape are formed in the first limiting plate (2 a) and the second limiting plate (2 b); the valve further comprises a synchronous transmission mechanism (3) for driving the first flow limiting plate (2 a) and the second flow limiting plate (2 b) to reversely and synchronously rotate, and a multiple dynamic sealing system (4) for sealing the valve body.
  2. 2. An eccentric adjustable flow device for a nuclear power plant as in claim 1 wherein: The synchronous transmission mechanism (3) comprises a first gear ring part (306) arranged on the periphery of the first current limiting plate (2 a), a second gear ring part (307) arranged on the periphery of the second current limiting plate (2 b), and an adjusting gear (305) meshed with the first gear ring part (306) and the second gear ring part (307) at the same time; The adjusting gear (305) is fixedly arranged on a driving shaft (303), and the driving shaft (303) is supported on the valve body through a bearing and shaft seal assembly and is connected with an external driving device.
  3. 3. An eccentric adjustable flow device for a nuclear power plant according to claim 2, wherein the outer wall of the first fixing plate (1 a) is integrally formed with a first connecting plate (301), the outer wall of the second fixing plate (1 b) is integrally formed with a second connecting plate (302), the first connecting plate (301) and the second connecting plate (302) are fixedly connected, arc-shaped grooves are formed at corresponding positions of the first connecting plate (301) and the second connecting plate (302), and an adjusting cavity for accommodating the adjusting gear (305) is formed by encircling the first connecting plate and the second connecting plate together.
  4. 4. An eccentric adjustable flow device for a nuclear power plant according to claim 1, characterized in that the multiple dynamic sealing system (4) comprises a first sealing ring (401) arranged between the first fixed plate (1 a) and a first flow restricting plate (2 a), a second sealing ring (402) arranged between the second fixed plate (1 b) and a second flow restricting plate (2 b), and a third sealing ring (403) and a fourth sealing ring (404) arranged between the first flow restricting plate (2 a) and the second flow restricting plate (2 b).
  5. 5. The eccentric adjustable flow device for the nuclear power plant according to claim 4, wherein a first sealing groove (8) for accommodating the first sealing ring (401) is formed in the bottom surface of a flow limiting cavity (5) of the first fixing plate (1 a), a second sealing groove (9) for accommodating the second sealing ring (402) is formed in the bottom surface of a flow limiting cavity (5) of the second fixing plate (1 b), a third sealing groove (10) for accommodating the third sealing ring (403) is formed in the end surface of the first flow limiting plate (2 a) facing the second flow limiting plate (2 b), and a fourth sealing groove (11) for accommodating the fourth sealing ring (404) is formed in the end surface of the second flow limiting plate (2 b) facing the first flow limiting plate (2 a).
  6. 6. An eccentric adjustable flow device for a nuclear power plant as claimed in claim 4 or 5, wherein the first (401), second (402), third (403) and fourth (404) sealing rings are all composite sealing rings comprising an inner metal bellows (12) elastomer and an outer spring reinforced polytetrafluoroethylene ring (13).
  7. 7. The eccentric adjustable flow device for nuclear power plants according to claim 6, wherein the elastic body of the metal corrugated pipe (12) is filled with inert gas, the cross section of the elastic body is isosceles trapezoid, the sloping sides of the elastic body are provided with wavy structures, and the cross section of the spring reinforced polytetrafluoroethylene ring (13) is U-shaped and is coated on the outer part of the elastic body of the metal corrugated pipe (12).
  8. 8. An eccentric adjustable flow device for a nuclear power plant as claimed in claim 1, wherein the end of the drive shaft (303) outside the valve body is connected to the output shaft of a servo motor (304) by means of a coupling.

Description

Eccentric adjustable flow device for nuclear power station Technical Field The application relates to the technical field of valves, in particular to an eccentric adjustable flow device for a nuclear power station. Background In the operation system of the nuclear power station, the fluid control technology is always a critical ring, and the development of the fluid control technology plays a non-negligible role in ensuring the safety, stability and efficient operation of the nuclear power station. With the continuous progress of nuclear power technology, the performance requirements for fluid regulating devices are also becoming increasingly stringent. Accurate flow regulation can ensure normal operation of each system of the nuclear power station, and potential safety hazards caused by abnormal flow are avoided. Meanwhile, stable fluid control is beneficial to improving the energy utilization efficiency and reducing the operation cost. Furthermore, reliable sealing performance is critical to preventing leakage of radioactive materials, which is directly related to the surrounding environment of the nuclear power plant and the safety of personnel. In the related art, in order to realize flow regulation and sealing, a single-plate throttling device is a common mode, and the flow area of fluid is changed mainly through rotation or movement of a throttling plate, so that the purpose of regulating the flow is achieved. The device has a relatively simple structure and low cost, and is widely applied to occasions with low requirements on flow regulation precision. In addition, labyrinth seal technology is also one of the common sealing means that utilizes the resistance created by the flow of fluid in the labyrinth passage to reduce leakage. The sealing mode does not need extra power, and the reliability is high. There is also a packing technique for achieving a sealing effect by packing a soft packing material such as asbestos, rubber, etc. in a sealing portion. The method is simple to operate and is suitable for some low-pressure and low-speed occasions. However, when the single-plate throttling device faces to an extreme pressure difference working condition, the impact moment of fluid on the throttling plate cannot be effectively counteracted, so that the device is easy to operate unstably, and larger vibration and noise are generated, so that the service lives of the valve and the connected pipeline are shortened, and the normal operation of the nuclear power station is possibly influenced. And traditional sealing modes such as labyrinth sealing, packing sealing and the like are difficult to systematically block leakage paths of a multi-revolute pair structure, and cannot meet strict requirements of a nuclear power station on absolute sealing reliability. Disclosure of Invention The application aims to overcome the technical problems and provide an eccentric adjustable flow device for a nuclear power station. The eccentric adjustable flow device for the nuclear power station comprises a valve body, wherein the valve body is formed by fixedly connecting a first fixing plate and a second fixing plate through a connecting piece, and a first fixing hole and a second fixing hole are correspondingly formed in eccentric positions of the first fixing plate and the second fixing plate respectively; The opposite inner side end surfaces of the first fixing plate and the second fixing plate are respectively provided with a current limiting cavity, and the current limiting cavities are respectively provided with the first current limiting plate and the second current limiting plate in a rotating way; limiting holes matched with the shape of the fixing holes are formed in the first limiting plate and the second limiting plate; The valve further comprises a synchronous transmission mechanism for driving the first flow limiting plate and the second flow limiting plate to reversely and synchronously rotate, and a multiple dynamic sealing system for sealing the valve body. By adopting the technical scheme, the basic principle of counteracting the impact moment of the single-side fluid through the reverse synchronous rotation of the double plates is established, the macroscopic effects of smoother operation, smaller vibration and lower noise of the device are realized, the fundamental scheme of systematically solving all potential leakage paths through a multiple dynamic sealing system is also established, and a structural foundation is laid for realizing high-reliability sealing. Optionally, the synchronous transmission mechanism comprises a first gear ring part arranged on the periphery of the first current limiting plate, a second gear ring part arranged on the periphery of the second current limiting plate, and an adjusting gear meshed with the first gear ring part and the second gear ring part at the same time, wherein the adjusting gear is fixedly arranged on a driving shaft, and the driving shaft is supported on the va