Double diaphragm pneumatic valve for nuclear power plant

Abstract

The utility model discloses a nuclear power plant double diaphragm pneumatic valve, it includes first diaphragm actuating mechanism air chamber, first gas supply subassembly, second diaphragm actuating mechanism air chamber, second gas supply subassembly, gas source, connecting rod and valve rod. This nuclear power plant double diaphragm pneumatic valve is through setting two parallel diaphragm actuating mechanism air chamber and independent gas supply subassembly, has realized the function of double cylinder drive valve. Any diaphragm actuating mechanism air chamber can drive valve rod alone to complete the switch operation of valve, when one of diaphragm actuating mechanism air chamber or its control loop fails, another diaphragm actuating mechanism air chamber can immediately take over, thoroughly solved the valve failure problem of traditional single cylinder pneumatic valve because of single point failure, significantly improved the reliability of valve operation, and the continuous operation of nuclear power plant system is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power plant valve technology, and in particular to a nuclear power plant double diaphragm pneumatic valve. Background Technology

[0002] ARE (Air-Acid Refrigerant) level regulation is one of the most important and complex systems in the nuclear island, and historically, it has caused the most reactor trips. Based on historical incidents, ARE level regulation system failures often require emergency intervention within minutes. During intervention, on-site personnel and the main control unit must communicate promptly regarding the direction and speed of intervention. However, the noisy environment severely hinders communication, sometimes leading to errors. These factors result in operators being unable to intervene effectively and promptly after ARE level regulation system malfunctions, leading to abnormal steam generator levels and reactor trips. Currently, most pneumatic valves used in nuclear power plants are single-diaphragm structures. During long-term use, the diaphragm plate is susceptible to damage due to the high radiation, high temperature, high pressure, and corrosion inherent in the nuclear power plant's environment, leading to valve failure and disrupting normal plant operations.

[0003] In addition, existing pneumatic valves also have certain shortcomings in terms of control accuracy, safety protection, and ease of maintenance. For example, the control accuracy is not high, making it difficult to meet the precise control requirements of nuclear power plants under different operating conditions; the safety protection measures are not perfect, and they cannot effectively resist nuclear radiation or cope with vibration and impact under complex operating conditions; and maintenance is inconvenient, increasing the labor intensity and maintenance costs for staff.

[0004] Therefore, developing a pneumatic valve for nuclear power plants with higher stability, reliability, control precision, better safety protection performance, and ease of maintenance is of great practical significance. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a dual-diaphragm pneumatic valve for nuclear power plants.

[0006] The technical solution adopted by this utility model to solve its technical problem is: to construct a nuclear power plant double diaphragm pneumatic valve, which includes a first diaphragm actuator air chamber, a first air supply component, a second diaphragm actuator air chamber, a second air supply component, an air source, a connecting rod, and a valve stem; The first diaphragm actuator air chamber and the second diaphragm actuator air chamber are arranged in parallel. The first diaphragm actuator air chamber includes a first housing and a first diaphragm plate installed in the first housing. The first housing is provided with a first air source inlet. The first air supply component includes a first air supply pipe and a first air supply control valve provided on the first air supply pipe. The two ends of the first air supply pipe are respectively connected to the first air source inlet and the air source. The second diaphragm actuator air chamber includes a second housing and a second diaphragm plate installed inside the second housing. The second housing is provided with a second air source inlet. The second air supply assembly includes a second air supply pipe and a second air supply control valve provided on the second air supply pipe. The two ends of the second air supply pipe are respectively connected to the second air source inlet and the air source. The connecting rod passes through the first housing and the second housing, and one end of the connecting rod is connected to the valve stem. Both the first diaphragm plate and the second diaphragm plate are used to drive the connecting rod to move.

[0007] In some embodiments, the nuclear power plant dual-diaphragm pneumatic valve further includes a sleeve body, wherein the first diaphragm actuator chamber and the second diaphragm actuator chamber are located separately on opposite sides of the sleeve body; or The first diaphragm actuator air chamber and the second diaphragm actuator air chamber are located on the same side of the sleeve body.

[0008] In some embodiments, the nuclear power plant dual-diaphragm pneumatic valve further includes a spring and a spring seat, both of which are installed in the sleeve body. The spring seat is connected to the connecting rod, and the spring is connected to the spring seat.

[0009] In some embodiments, the nuclear power plant dual-diaphragm pneumatic valve further includes a push rod and a manual adjustment assembly; The end of the connecting rod away from the valve stem is connected to the top rod. The manual adjustment assembly includes a push rod that is throttledly connected to the top rod, a handwheel connected to the push rod, and a locking element for fixing the position of the push rod.

[0010] In some embodiments, both the first gas supply pipe and the second gas supply pipe are provided with filter pressure reducing valves.

[0011] In some embodiments, pressure gauges are provided on both the first gas supply pipe and the second gas supply pipe.

[0012] In some embodiments, the nuclear power plant dual-diaphragm pneumatic valve further includes a valve position indicator.

[0013] In some embodiments, a pressure stabilizing device is provided between the gas source and the first gas supply pipeline and the second gas supply pipeline.

[0014] In some embodiments, the first housing, the second housing, and the sleeve are all made of alloy material.

[0015] In some embodiments, the outer surfaces of the first housing, the second housing, and the sleeve are all coated with an anti-radiation coating.

[0016] The present invention offers the following advantages: This nuclear power plant dual-diaphragm pneumatic valve achieves the function of a dual-cylinder driven valve by setting two parallel diaphragm actuator chambers and independent air supply components. Either diaphragm actuator chamber can independently drive the valve stem to complete the valve opening and closing operation. When one diaphragm actuator chamber or its control circuit fails, the other diaphragm actuator chamber can immediately take over, completely solving the valve failure problem caused by a single point of failure in traditional single-cylinder pneumatic valves. This significantly improves the reliability of valve operation and ensures the continuous operation of the nuclear power plant system. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the nuclear power plant double diaphragm pneumatic valve of this utility model; Figure 2 This is a partial structural schematic diagram of the nuclear power plant double diaphragm pneumatic valve of this utility model; Figure 3 This is a schematic diagram of the second embodiment of the overall structure of the nuclear power plant double diaphragm pneumatic valve of this utility model; Figure 4 This is a schematic diagram of the second embodiment of the overall structure of the nuclear power plant double diaphragm pneumatic valve of this utility model. Detailed Implementation

[0018] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0019] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0020] Reference Figure 1 and Figure 2 This is a nuclear power plant dual-diaphragm pneumatic valve according to some embodiments of the present invention, which includes a first diaphragm actuator air chamber 1, a first air supply component 2, a second diaphragm actuator air chamber 3, a second air supply component 4, an air source 5, a connecting rod 6, and a valve stem 7. The first diaphragm actuator air chamber 1 and the second diaphragm actuator air chamber 3 are arranged in parallel. The first diaphragm actuator air chamber 1 includes a first housing 11 and a first diaphragm plate 12 installed in the first housing 11. The first housing 11 is provided with a first air source inlet 111. The first air supply component 2 includes a first air supply pipe 21 and a first air supply control valve 22 provided on the first air supply pipe 21. The two ends of the first air supply pipe 21 are respectively connected to the first air source inlet 111 and the air source 5. The second diaphragm actuator air chamber 3 includes a second housing 31 and a second diaphragm plate 32 installed inside the second housing 31. A second air source inlet 311 is provided on the second housing 31. The second air supply assembly 4 includes a second air supply pipe 41 and a second air supply control valve 42 installed on the second air supply pipe 41. The two ends of the second air supply pipe 41 are respectively connected to the second air source inlet 311 and an air source 5. A connecting rod 6 passes through the first housing 11 and the second housing 31, with one end connected to a valve stem 7. Both the first diaphragm plate 12 and the second diaphragm plate 32 are used to move the connecting rod 6. The first air source inlet 111 and the second air source inlet 311 can be located above or below their respective diaphragm actuator air chambers, depending on the specific working scenario of the nuclear power plant's dual-diaphragm pneumatic valve.

[0021] Understandably, this nuclear power plant's dual-diaphragm pneumatic valve achieves the function of dual-cylinder driven valves by setting up two parallel diaphragm actuator chambers and independent air supply components. Either diaphragm actuator chamber can independently drive the valve stem 7 to complete the valve opening and closing operation. When one diaphragm actuator chamber or its control circuit fails, the other diaphragm actuator chamber can immediately take over, completely solving the valve failure problem caused by a single point of failure in traditional single-cylinder pneumatic valves. This significantly improves the reliability of valve operation and ensures the continuous operation of the nuclear power plant system.

[0022] like Figure 1 , Figure 3 and Figure 4 As shown, the nuclear power plant dual-diaphragm pneumatic valve also includes a sleeve body 81, with the first diaphragm actuator chamber 1 and the second diaphragm actuator chamber 3 located separately on opposite sides of the sleeve body 81. Alternatively, the first diaphragm actuator chamber 1 and the second diaphragm actuator chamber 3 can be located on the same side of the sleeve body 81. This separate arrangement of the first diaphragm actuator chamber 1 and the second diaphragm actuator chamber 3 makes the overall valve structure more compact, saving installation space. It also avoids mutual interference between the two chambers, reducing the risk of malfunctions due to structural congestion, and facilitates separate inspection and maintenance of each chamber.

[0023] The nuclear power plant's dual-diaphragm pneumatic valve also includes a spring 82 and a spring seat 83. Both spring 82 and spring seat 83 are installed inside the sleeve body 81. Spring seat 83 is connected to the connecting rod 6, and spring 82 is connected to spring seat 83. The cooperation between spring 82 and spring seat 83 provides a restoring force for the connecting rod 6. When the gas source 5 stops supplying gas or an abnormal pressure occurs, spring 82 can drive the connecting rod 6 to reset, ensuring that the valve can return to the preset position, thus enhancing the valve's safety and emergency response capability.

[0024] The nuclear power plant's dual-diaphragm pneumatic valve also includes a push rod 84 and a manual adjustment assembly 85. The end of the connecting rod 6 furthest from the valve stem 7 is connected to the push rod 84. The manual adjustment assembly 85 includes a push rod 851 driven by the push rod 84, a handwheel 852 connected to the push rod 851, and a locking element 853 for fixing the position of the push rod 851. The combination of the push rod 84 and the manual adjustment assembly 85 enables manual operation of the valve. In extreme cases of complete pneumatic system failure or when manual operation is required, rotating the handwheel 852 drives the push rod 851 and the push rod 84, which in turn drives the connecting rod 6 and the valve stem 7, ensuring the valve can still open and close normally. This provides reliable protection for emergency response in nuclear power plants and improves the valve's applicability.

[0025] Both the first air supply pipe 21 and the second air supply pipe 41 are equipped with filter pressure reducing valves 91. The filter pressure reducing valves 91 can filter and regulate the pressure of the air source 5 entering the air chamber, remove impurities and moisture from the air source 5, prevent impurities from entering the air chamber and causing wear or blockage, and stabilize the pressure of the air source 5 within a suitable range to ensure that the air chamber operates smoothly and accurately, thus extending the service life of the air chamber and the entire pneumatic system.

[0026] Pressure gauges 92 are installed on both the first gas supply pipeline 21 and the second gas supply pipeline 41. The pressure gauges 92 can monitor the pressure changes in the two gas supply pipelines in real time, detect abnormal gas supply pressure in a timely manner, such as excessively high pressure, excessively low pressure or leakage, and feed the signal back to the control system. This provides a basis for fault diagnosis and automatic switching of pneumatic valves and control circuits, and improves the intelligent monitoring level of valves.

[0027] A pressure stabilizing device 93 is installed between the air source 5 and the first air supply pipeline 21 and the second air supply pipeline 41. The pressure stabilizing device 93 can stabilize the pressure output from the air source 5 to the two air supply pipelines, avoid the impact of air source 5 pressure fluctuations on the pneumatic valve operation, ensure the stable working pressure of the air chambers of the two diaphragm actuators, and further guarantee the consistency and reliability of valve operation.

[0028] The nuclear power plant's dual-diaphragm pneumatic valve also includes a valve position indicator 10. The valve position indicator 10 can display the valve's open / closed status and stroke position in real time, assisting operators in understanding the valve's operating status. At the same time, it works with the control system to ensure that the displacement of the valve stem 7 is precisely matched with the control signal, improving the valve's control accuracy and meeting the nuclear power plant's requirements for precise adjustment of fluid medium parameters such as flow rate and pressure.

[0029] The first housing 11, the second housing 31, and the sleeve 81 are all made of alloy materials. Alloy materials have excellent properties such as high strength, corrosion resistance, and high temperature resistance. Using alloy materials to manufacture the first housing 11, the second housing 31, and the sleeve 81 enables the gas chamber to withstand higher internal pressure and corrosion in the nuclear power plant environment, improving the structural strength and durability of the pneumatic valve and adapting it to the harsh working environment of a nuclear power plant.

[0030] The outer surfaces of the first shell 11, the second shell 31, and the sleeve 81 are all coated with a radiation-proof coating. The radiation-proof coating can effectively block radiation in the nuclear power plant environment, reduce radiation damage to the shell and sleeve 81, extend their service life, reduce the risk of radiation leakage, ensure the safety of operators, and enhance the applicability of pneumatic valves in the special environment of nuclear power plants.

[0031] When the dual-diaphragm pneumatic valve of this nuclear power plant is in operation, it can select either a one-operation-one-standby or dual-cylinder parallel control mode as needed. In the one-operation-one-standby mode, one cylinder is working while the other is on standby. Pressure gauge 92 monitors the air supply pressure of the working cylinder in real time. When an abnormality occurs, the control system controls the corresponding air supply control valve to close and simultaneously opens the air supply control valve of the standby cylinder, achieving a seamless switching. In the dual-cylinder parallel mode, both cylinders work simultaneously, jointly driving the valve. When the pneumatic system fails, the valve can be manually operated via the manual adjustment component 85.

[0032] During operation, pressure gauge 92 monitors the pressure in the gas supply pipeline in real time and feeds the pressure signal back to the control system so that adjustments or alarms can be made in a timely manner when the gas supply pressure is abnormal. Pressure stabilizing device 93 stabilizes the gas pressure output from gas source 5, reducing the impact of pressure fluctuations on the stability of valve operation. Valve position indicator 10 improves the control accuracy of the valve, ensuring that the valve operates accurately according to preset instructions. When the automatic control malfunctions, the operator can manually control the valve opening by turning handwheel 852, which in turn drives push rod 851 and top rod 84, thereby driving connecting rod 6 and valve stem 7. After control is completed, the position of push rod 851 is fixed by locking component 853.

[0033] The beneficial effects of the dual-diaphragm pneumatic valve in this nuclear power plant are: Improved reliability: This invention features two diaphragm actuator chambers, each capable of fully opening and closing the valve. If one chamber or its control circuit malfunctions, the system automatically switches to the other chamber for independent control, effectively preventing valve failure due to a single chamber or control circuit failure and significantly improving valve reliability. Furthermore, both chambers simultaneously receive the same control signal, working together to drive the valve stem. This mode provides greater output power, suitable for extremely heavy loads or to improve response speed.

[0034] Flexible operation: The dual-diaphragm actuator gas chamber can adopt multiple operation modes such as one in operation and one in standby or parallel control, which can be flexibly selected according to the actual operation needs of the nuclear power plant, thus improving the adaptability of the valve.

[0035] Seamless switching during faults: When an abnormality occurs in the gas chamber and control circuit of one diaphragm actuator, it can automatically switch to another diaphragm actuator gas chamber, realizing seamless switching of valve fault control, ensuring the continuity and stability of the operation of related systems in nuclear power plants, and reducing the risk of safety accidents caused by valve faults.

[0036] Reasonable structure: The two diaphragm actuator air chambers are arranged separately, making the overall structure more compact and reasonable; the shell is made of alloy material and coated with radiation-proof coating, which improves the service life and safety of the valve in the harsh environment of nuclear power plants.

[0037] Precise control: The gas supply pipeline is equipped with a filter pressure reducing valve 91, a pressure gauge 92, and a pressure stabilizing device 93, which can accurately control and monitor the gas supply pressure. At the same time, a valve position indicator 10 is also installed to ensure the accuracy and stability of the diaphragm actuator's air chamber movement, thereby improving the valve's control precision.

[0038] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A dual-diaphragm pneumatic valve for nuclear power plants, characterized in that, It includes a first diaphragm actuator air chamber (1), a first air supply assembly (2), a second diaphragm actuator air chamber (3), a second air supply assembly (4), an air source (5), a connecting rod (6), and a valve stem (7); The first diaphragm actuator air chamber (1) and the second diaphragm actuator air chamber (3) are arranged in parallel. The first diaphragm actuator air chamber (1) includes a first housing (11) and a first diaphragm plate (12) installed in the first housing (11). The first housing (11) is provided with a first air source inlet (111). The first air supply assembly (2) includes a first air supply pipe (21) and a first air supply control valve (22) provided on the first air supply pipe (21). The two ends of the first air supply pipe (21) are respectively connected to the first air source inlet (111) and the air source (5). The second diaphragm actuator air chamber (3) includes a second housing (31) and a second diaphragm plate (32) installed in the second housing (31). The second housing (31) is provided with a second air source inlet (311). The second air supply assembly (4) includes a second air supply pipe (41) and a second air supply control valve (42) provided on the second air supply pipe (41). The two ends of the second air supply pipe (41) are respectively connected to the second air source inlet (311) and the air source (5). The connecting rod (6) passes through the first housing (11) and the second housing (31), and one end of the connecting rod (6) is connected to the valve stem (7). The first diaphragm plate (12) and the second diaphragm plate (32) are both used to drive the connecting rod (6) to move.

2. The nuclear power plant dual-diaphragm pneumatic valve according to claim 1, characterized in that, The nuclear power plant double diaphragm pneumatic valve also includes a sleeve (81). The first diaphragm actuator air chamber (1) and the second diaphragm actuator air chamber (3) are located separately on both sides of the sleeve body (81); or The first diaphragm actuator air chamber (1) and the second diaphragm actuator air chamber (3) are located on the same side of the sleeve body (81).

3. The nuclear power plant dual-diaphragm pneumatic valve according to claim 2, characterized in that, The nuclear power plant dual-diaphragm pneumatic valve also includes a spring (82) and a spring seat (83). The spring (82) and the spring seat (83) are both installed inside the sleeve body (81). The spring seat (83) is connected to the connecting rod (6), and the spring (82) is connected to the spring seat (83).

4. The nuclear power plant dual-diaphragm pneumatic valve according to claim 1, characterized in that, The nuclear power plant dual-diaphragm pneumatic valve also includes a push rod (84) and a manual adjustment assembly (85). The end of the connecting rod (6) away from the valve stem (7) is connected to the top rod (84). The manual adjustment assembly (85) includes a push rod (851) that is throttledly connected to the top rod (84), a handwheel (852) that is connected to the push rod (851), and a locking member (853) for fixing the position of the push rod (851).

5. The nuclear power plant dual-diaphragm pneumatic valve according to claim 1, characterized in that, Both the first gas supply pipe (21) and the second gas supply pipe (41) are equipped with filter pressure reducing valves (91).

6. The nuclear power plant dual-diaphragm pneumatic valve according to claim 1, characterized in that, Pressure gauges (92) are provided on both the first gas supply pipe (21) and the second gas supply pipe (41).

7. The nuclear power plant dual-diaphragm pneumatic valve according to claim 1, characterized in that, The nuclear power plant dual-diaphragm pneumatic valve also includes a valve position indicator (10).

8. The nuclear power plant dual-diaphragm pneumatic valve according to claim 1, characterized in that, A pressure stabilizing device (93) is provided between the gas source (5) and the first gas supply pipeline (21) and the second gas supply pipeline (41).

9. The nuclear power plant dual-diaphragm pneumatic valve according to claim 2, characterized in that, The first housing (11), the second housing (31) and the sleeve (81) are all made of alloy material.

10. The nuclear power plant dual-diaphragm pneumatic valve according to claim 2, characterized in that, The outer surfaces of the first housing (11), the second housing (31), and the sleeve body (81) are all coated with an anti-radiation coating.

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