Valve opening detection system and valve opening state feedback device thereof
By designing a valve opening status feedback device in the nuclear power plant, the valve opening can be monitored and displayed in real time, solving the problem of the inability of the nuclear power plant to monitor in real time, and improving the stability of unit operation and the accuracy of fault diagnosis.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YANGJIANG NUCLEAR POWER
- Filing Date
- 2025-06-19
- Publication Date
- 2026-06-05
AI Technical Summary
Nuclear power plants cannot monitor valve opening status in real time, which increases the difficulty for unit control room operators in diagnosing and intervening in faults, potentially leading to unit instability or even accidental reactor shutdown, resulting in economic losses.
Design a valve opening status feedback device, including a processing module, a display module and multiple valve position measurement modules. The device is mechanically connected to the valve stem through a sensing mechanism, senses the position of the magnetic strip and outputs the valve position signal, and uses a signal conditioning circuit and controller to monitor and display the valve opening in real time.
It enables real-time monitoring and display of the opening status of multiple valves, improving the stability of unit operation and the accuracy of fault diagnosis, and reducing the risk of misoperation.
Smart Images
Figure CN224326777U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of nuclear power plant technology, and in particular to a valve opening detection system and its valve opening status feedback device. Background Technology
[0002] In a certain nuclear power plant, valve opening is monitored by recording valve opening command signals, which do not reflect the actual valve opening. When a valve malfunctions, the valve opening can only be preliminarily judged based on information such as feedwater flow and valve limit switches. The actual valve opening can only be read on-site by personnel. This increases the difficulty for operators in the unit control room to diagnose and accurately intervene in transient faults, which is not only detrimental to the safe and stable operation of the unit but may also trigger accidental reactor shutdowns in severe cases, causing significant economic losses. Therefore, nuclear power plants urgently need a device that can provide real-time feedback on valve opening status. Utility Model Content
[0003] The technical problem to be solved by this utility model is to overcome the current deficiency that nuclear power plants cannot monitor the valve opening status in real time, and to provide a valve opening detection system and its valve opening status feedback device.
[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct a valve opening status feedback device, including a processing module, a display module and multiple valve position measurement modules;
[0005] Each of the valve position measurement modules includes a sensing mechanism for mechanically connecting the valve stem to the valve in a one-to-one manner to follow the movement of the valve stem, and a position feedback mechanism for sensing the position of the sensing mechanism and outputting a valve position signal.
[0006] The processing module is electrically connected to the position feedback mechanism of all the valve position measurement modules, and is used to receive the valve position signal;
[0007] The display module is electrically connected to the processing module and is used to display the valve opening degree of all the valves.
[0008] Preferably, the sensing mechanism includes a magnetic strip support for mechanical connection with the valve stem of the corresponding valve, and a magnetic strip mounted on the magnetic strip support and cooperating with the position feedback mechanism.
[0009] Preferably, the position feedback mechanism includes a valve position feedback device for sensing the position of the magnetic strip and outputting the valve position signal, and a feedback device bracket for mechanically connecting to the body of the corresponding valve and fixing the valve position feedback device.
[0010] Preferably, the valve position measurement module includes a valve position measuring device of model Fisher4400, wherein the valve position measuring device includes a magnetic strip in the sensing mechanism and a valve position feedback device in the position feedback mechanism.
[0011] Preferably, the processing module includes a signal conditioning circuit and a controller;
[0012] The signal conditioning circuit is electrically connected to the position feedback mechanism of all the valve position measurement modules and is used to process all valve position signals.
[0013] The controller is electrically connected to the signal conditioning circuit and the display module, and is used to receive all processed valve position signals and control the display module to display the valve opening degree of all the valves.
[0014] Preferably, the signal conditioning circuit includes an isolated power supply unit, a filtering unit, and an analog-to-digital conversion unit;
[0015] The isolated power supply unit is electrically connected to the position feedback mechanism of all the valve position measurement modules, and is used to supply power to each of the position feedback mechanisms and limit the current of each valve position signal;
[0016] The filtering unit is electrically connected to the isolated power supply unit and is used to filter and impedance match all valve position signals.
[0017] The analog-to-digital conversion unit is electrically connected to the filtering unit and the controller, and is used to convert all filtered valve position signals into digital signals and send them to the controller.
[0018] Preferably, the isolated power supply unit includes an isolated power supply and multiple current limiting units; the isolated power supply is electrically connected to each of the position feedback mechanisms, and each of the position feedback mechanisms is electrically connected to the filtering unit via one of the current limiting units.
[0019] Preferably, the filtering unit includes multiple sub-filtering units, each of which includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a fourth resistor R4, a fifth resistor R5, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4.
[0020] The first end of the first resistor R1 is electrically connected to the positive signal output terminal of the position feedback mechanism via the current limiting unit. The first end of the first resistor R1 is also connected to digital ground via the second resistor R2. The first end of the first resistor R1 is also connected to the analog-to-digital conversion unit via the fourth resistor R4. The first end of the first resistor R1 is also connected to the second end of the first resistor R1 via the first capacitor C1. The second end of the fourth resistor R4 is electrically connected to the negative signal output terminal of the position feedback mechanism. The second end of the fourth resistor R4 is also connected to the set DC voltage via the third resistor R3. The second end of the fourth resistor R4 is also connected to the analog-to-digital conversion unit via the fifth resistor R5. The node after the fourth resistor R4 is connected to the analog-to-digital conversion unit is connected in two ways: one path is connected to analog ground via the second capacitor C2, and the other path is connected to the node after the fifth resistor R5 is connected to the analog-to-digital conversion unit via the third capacitor C3. The node after the fifth resistor R5 is connected to the analog-to-digital conversion unit is also connected to analog ground via the fourth capacitor C4.
[0021] Preferably, the number of current limiting units and sub-filter units is 8 each.
[0022] This invention also constructs a valve opening detection system, including the valve opening status feedback device described above.
[0023] The implementation of this utility model has the following beneficial effects: it can monitor and display the opening status of multiple valves in real time, enabling operators in the control room to more accurately diagnose and intervene in the unit under transient conditions, which helps to improve the stability of unit operation. Attached Figure Description
[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:
[0025] Figure 1 This is a structural block diagram of the valve opening status feedback device in some embodiments of this utility model;
[0026] Figure 2 This is a schematic diagram of the valve position measuring module in some embodiments of this utility model;
[0027] Figure 3 This is a circuit structure block diagram of the processing module in some embodiments of this utility model;
[0028] Figure 4 This is a circuit diagram of the isolation power supply unit and the sub-filter unit in some embodiments of this utility model. Detailed Implementation
[0029] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0030] In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "up," "down," "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.
[0031] Figure 1 This is a structural block diagram of a valve opening status feedback device in some embodiments of the present invention. This device can monitor and display the opening status of multiple valves in real time. The valve opening status feedback device may include a processing module 1, a display module 2, and multiple valve position measurement modules 3.
[0032] Please see Figure 2 Each valve position measurement module 3 may include a sensing mechanism 31 and a position feedback mechanism 32. The sensing mechanism 31 is used to mechanically connect the valve stem to the valve in a one-to-one manner to follow the movement of the valve stem.
[0033] Furthermore, such as Figure 2 As shown, the sensing mechanism 31 may include a magnetic strip support 311 and a magnetic strip 312. The magnetic strip support 311 is mechanically connected to the valve stem of the corresponding valve, allowing the magnetic strip support 311 to move with the valve stem. The magnetic strip 312 is mounted on the magnetic strip support 311, so that the movement of the magnetic strip support 311 can drive the magnetic strip 312 to move, thereby enabling the magnetic strip 312 to cooperate with the position feedback mechanism 32.
[0034] The position feedback mechanism 32 is used to sense the position of the magnetic strip 312 in the sensing mechanism 31 and output a valve position signal that can characterize the position of the magnetic strip 312. It should be noted that since the magnetic strip 312 moves with the valve stem, the position of the magnetic strip 312 can provide feedback on the valve opening.
[0035] Furthermore, such as Figure 2 As shown, the position feedback mechanism 32 may include a valve position feedback device 321 and a feedback device bracket 322.
[0036] The valve position feedback unit 321 is used to sense the position of the magnetic strip 312 and output the valve position signal. Specifically, the valve position feedback unit 321 can be the valve position feedback unit in the Fisher 4400 valve position measuring device. Correspondingly, the magnetic strip 312 is the magnetic strip in the Fisher 4400 valve position measuring device. The Fisher 4400 valve position feedback unit can sense the displacement distance of the magnetic strip 312 and output a signal that can characterize the magnitude of the displacement distance (i.e., the valve position signal).
[0037] The feedback bracket 322 is used for mechanical connection with the corresponding valve body and to fix the valve position feedback device 321. It should be noted that the feedback bracket 322 can be any component such as a coupling fixed to the valve body, as long as the feedback bracket 322 can remain stationary relative to the valve body. That is, when the valve stem moves, the valve stem will also be displaced relative to the valve position feedback device 321, thereby ensuring that the valve position feedback device 321 can sense the displacement of the magnetic strip 312.
[0038] In some embodiments, the magnetic stripe bracket 311 and the feedback bracket 322 can be installed in their respective positions by screwing.
[0039] The processing module 1 is electrically connected to the position feedback mechanism 32 of all valve position measurement modules 3. The processing module 1 is used to receive valve position signals and control the display module 2 to display the valve opening degree of all detected valves.
[0040] In some embodiments, such as Figure 3 As shown, the processing module 1 may include a signal conditioning circuit 11 and a control unit 12.
[0041] The signal conditioning circuit 11 is electrically connected to the position feedback mechanism 32 of all valve position measurement modules 3. The signal conditioning circuit 11 is used to process all valve position signals, including filtering and impedance matching of the valve position signals.
[0042] In some embodiments, such as Figure 3 As shown, the signal conditioning circuit 11 may include an isolated power supply unit 111, a filter unit 112, and an analog-to-digital converter unit 113.
[0043] The isolated power supply unit 111 is electrically connected to the position feedback mechanism 32 of all valve position measurement modules 3. The isolated power supply unit 111 is used to supply power to each position feedback mechanism 32 and to limit the current of each valve position signal.
[0044] In some embodiments, such as Figure 4 As shown, the isolated power supply unit 111 may include an isolated power supply 1111 and multiple current limiting units 1112. The isolated power supply 1111 is electrically connected to each position feedback mechanism 32 to power the valve position feedback unit 321 in each position feedback mechanism 32. It should be noted that the isolated power supply 1111 can be an existing isolated power supply, and using an isolated power supply helps to improve the signal-to-noise ratio of the valve position signal.
[0045] The positive terminal of the signal output of each position feedback mechanism 32 (i.e., valve position feedback device 321) is electrically connected to the filter unit 112 via a current limiting unit 1112. The current limiting unit 1112 can be an existing fuse, which can prevent damage due to overcurrent of the output signal of the position feedback mechanism 32.
[0046] The filter unit 112 is electrically connected to the isolation power supply unit 111. The filter unit 112 is used to filter all valve position signals and perform impedance matching.
[0047] In some embodiments, the filtering unit 112 may include multiple such... Figure 4 The sub-filter unit 1121. Each sub-filter unit 1121 includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a fourth resistor R4, a fifth resistor R5, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4. The first end of the first resistor R1 is electrically connected to the positive signal output terminal of the position feedback mechanism 32 via the current limiting unit 1112. The first end of the first resistor R1 is also connected to digital ground via the second resistor R2. The first end of the first resistor R1 is also connected to the analog-to-digital converter unit 113 via the fourth resistor R4. The first end of the first resistor R1 is also connected to the second end of the first resistor R1 via the first capacitor C1. The second end of the fourth resistor R4 is electrically connected to the negative signal output terminal of the position feedback mechanism 32. The second end of the fourth resistor R4 is also connected to the set DC voltage via the third resistor R3. The second end of the fourth resistor R4 is also connected to the analog-to-digital converter unit 113 via the fifth resistor R5. One path of the node after the fourth resistor R4 is connected to the analog ground via the second capacitor C2, and the other path is electrically connected to the node after the fifth resistor R5 is connected to the analog-to-digital converter unit 113 via the third capacitor C3. The node after the fifth resistor R5 is connected to the analog-to-digital converter unit 113 is also connected to the analog ground via the fourth capacitor C4.
[0048] The valve position signal may be a current signal ranging from 4mA to 20mA. The function of the first resistor R1 is to convert the valve position signal into a voltage signal. The second resistor R2, the third resistor R3, the fourth resistor R4, and the fifth resistor R5 constitute an impedance matching circuit, used to achieve impedance matching of the converted voltage signal and improve the signal-to-noise ratio. The first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 constitute a filter circuit, used to filter out noise in the voltage signal to further improve the signal-to-noise ratio. Understandably, this embodiment has the advantages of simple circuit structure and excellent filtering effect.
[0049] The analog-to-digital converter 113 is electrically connected to the filter unit 112 and the control unit 12. The analog-to-digital converter 113 is used to convert all filtered valve position signals into digital signals and send the digital signals to the control unit 12. The analog-to-digital converter 113 may include existing analog-to-digital converter circuits or modules, as long as they can convert multiple analog signals into digital signals.
[0050] The control unit 12 is electrically connected to the signal conditioning circuit 11 and the display module 2. The control unit 12 receives all processed valve position signals and controls the display module 2 to display the valve opening degree of all valves. Specifically, the control unit 12 may include an existing microprocessor, mainly used for data processing of all valve position signals and controlling the operation of the display module 2. The display module 2 can directly display the displacement of the magnetic strip 312 as the valve opening degree, or it can convert the displacement into the valve opening degree before displaying it.
[0051] In some embodiments, the number of valve position measurement module 3, current limiting unit 1112 and sub-filter unit 1121 can all be eight.
[0052] Display module 2 is electrically connected to processing module 1. Display module 2 is used to display the valve opening degree of all valves. Display module 2 may include a display installed in the control room.
[0053] This utility model also provides a valve opening detection system, including the valve opening status feedback device provided in the embodiments of this utility model.
[0054] Understandably, this invention can monitor and display the opening status of multiple valves in real time, enabling operators in the control room to more accurately diagnose and intervene in faults during unit transients, which helps to improve the stability of unit operation.
[0055] 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 valve opening status feedback device, characterized in that, It includes a processing module (1), a display module (2), and multiple valve position measurement modules (3); Each of the valve position measurement modules (3) includes a sensing mechanism (31) for mechanically connecting the valve stem to the valve one-to-one to follow the movement of the valve stem, and a position feedback mechanism (32) for sensing the position of the sensing mechanism (31) and outputting a valve position signal; The processing module (1) is electrically connected to the position feedback mechanism (32) of all the valve position measurement modules (3) and is used to receive the valve position signal; The display module (2) is electrically connected to the processing module (1) and is used to display the valve opening degree of all the valves.
2. The valve opening status feedback device according to claim 1, characterized in that, The sensing mechanism (31) includes a magnetic strip support (311) for mechanical connection with the valve stem of the corresponding valve, and a magnetic strip (312) mounted on the magnetic strip support (311) and cooperating with the position feedback mechanism (32).
3. The valve opening status feedback device according to claim 2, characterized in that, The position feedback mechanism (32) includes a valve position feedback device (321) for sensing the position of the magnetic strip (312) and outputting the valve position signal, and a feedback device bracket (322) for mechanically connecting to the body of the corresponding valve and fixing the valve position feedback device (321).
4. The valve opening status feedback device according to claim 3, characterized in that, The valve position measurement module (3) includes a valve position measuring device of model Fisher4400, wherein the valve position measuring device includes a magnetic strip (312) in the sensing mechanism (31) and a valve position feedback device (321) in the position feedback mechanism (32).
5. The valve opening status feedback device according to any one of claims 1 to 4, characterized in that, The processing module (1) includes a signal conditioning circuit (11) and a control unit (12); The signal conditioning circuit (11) is electrically connected to the position feedback mechanism (32) of all the valve position measurement modules (3) and is used to process all valve position signals; The control unit (12) is electrically connected to the signal conditioning circuit (11) and the display module (2) to receive all processed valve position signals and control the display module (2) to display the valve opening of all valves.
6. The valve opening status feedback device according to claim 5, characterized in that, The signal conditioning circuit (11) includes an isolated power supply unit (111), a filtering unit (112), and an analog-to-digital conversion unit (113); The isolated power supply unit (111) is electrically connected to the position feedback mechanism (32) of all the valve position measurement modules (3) and is used to supply power to each of the position feedback mechanisms (32) and limit the current of each valve position signal; The filtering unit (112) is electrically connected to the isolated power supply unit (111) and is used to filter all the valve position signals; The analog-to-digital conversion unit (113) is electrically connected to the filtering unit (112) and the control unit (12) and is used to convert all filtered valve position signals into digital signals and send them to the control unit (12).
7. The valve opening status feedback device according to claim 6, characterized in that, The isolated power supply unit (111) includes an isolated power supply (1111) and multiple current limiting units (1112); the isolated power supply (1111) is electrically connected to each of the position feedback mechanisms (32), and each of the position feedback mechanisms (32) is electrically connected to the filter unit (112) via one of the current limiting units (1112).
8. The valve opening status feedback device according to claim 7, characterized in that, The filtering unit (112) includes multiple sub-filtering units (1121), each of which includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a fourth resistor R4, a fifth resistor R5, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4. The first end of the first resistor R1 is electrically connected to the positive signal output terminal of the position feedback mechanism (32) via the current limiting unit (1112). The first end of the first resistor R1 is also connected to digital ground via the second resistor R2. The first end of the first resistor R1 is also connected to the analog-to-digital conversion unit (113) via the fourth resistor R4. The first end of the first resistor R1 is also connected to the second end of the first resistor R1 via the first capacitor C1. The second end of the fourth resistor R4 is electrically connected to the negative signal output terminal of the position feedback mechanism (32). The second end of the resistor is connected to the set DC voltage via the third resistor R3. The second end of the fourth resistor R4 is connected to the analog-to-digital converter (113) via the fifth resistor R5. The node after the fourth resistor R4 is connected to the analog-to-digital converter (113) is connected to analog ground via the second capacitor C2 and electrically connected to the node after the fifth resistor R5 is connected to the analog-to-digital converter (113) via the third capacitor C3. The node after the fifth resistor R5 is connected to the analog-to-digital converter (113) is also connected to analog ground via the fourth capacitor C4.
9. The valve opening status feedback device according to claim 8, characterized in that, The number of current limiting units (1112) and sub-filter units (1121) is 8 each.
10. A valve opening detection system, characterized in that, Includes the valve opening status feedback device as described in any one of claims 1 to 9.