A detection device and method for a nuclear power plant underwater limit switch

Abstract

This invention relates to the field of nuclear power plant operation and maintenance technology, and particularly to a detection device and method for underwater limit switches in nuclear power plants. The device includes: an electric heater installed on the inner wall of a container; a water supply tank connected to a water pump and the container body; a temperature transmitter and a pressure transmitter installed on a cover plate, with their measuring probes installed inside the container body; a trigger block cylinder installed on the upper part of the cover plate, with a trigger block linkage rod connecting the trigger block cylinder and the trigger block through a hole in the cover plate; a trigger block position encoder installed on the trigger block linkage rod; a vibration generator connected to a slide rail bracket, with the slide rail cylinder and the limit switch mounting bracket clamp connected via the slide rail cylinder linkage rod; an electric air source pump connected to the trigger block cylinder solenoid valve and the slide rail cylinder solenoid valve; and signal transmission between each component and the limit switch detection device and industrial control computer. This invention is used for the detection of underwater limit switches in nuclear power plants, improving equipment reliability.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant operation and maintenance technology, and in particular to a detection device and method for underwater limit switches in nuclear power plants. Background Technology

[0002] As a key component of the M310 unit during refueling after a shutdown, the reliability of the fuel transfer system directly impacts the safe and stable operation of the power plant's fuel system. The underwater limit switches, crucial measuring elements of the fuel transfer system, are redundantly installed at each position to ensure precise position control. They play a vital role in interlocking control and system safety protection under abnormal conditions. Failure or reduced reliability of the underwater limit switches during operation will affect the entire fuel handling process and pose a risk of fuel damage.

[0003] Therefore, a testing device is needed for underwater limit switches in nuclear power plants to perform electrical and functional tests, improve equipment reliability, and ensure safe and stable fuel operation. Summary of the Invention

[0004] The technical problem this invention aims to solve is to provide a testing device and method for underwater limit switches in nuclear power plants. Using this device to test underwater limit switches ensures that the insulation resistance, dielectric strength, and operating time of the underwater limit switches are within acceptable limits during installation, as well as the accuracy of repeated operation, the correctness of the installation position / distance, and the pressure-bearing capacity of the underwater limit switches. This avoids abnormal situations such as low insulation, damage, and inability to trigger properly after installation, and prevents damage to the safety and economic benefits of nuclear power plant personnel due to abnormal fuel operation.

[0005] This invention provides a detection device for underwater limit switches in nuclear power plants, comprising:

[0006] Container body;

[0007] An electric heater is installed on the inner wall of the container to control the temperature inside the container.

[0008] The water supply storage tank is connected to the water pump and the container body;

[0009] The top cover of the container can be opened to insert the limit switch to be tested.

[0010] Temperature and pressure transmitters are mounted on the cover plate, and their measuring probes are installed inside the container body through holes in the cover plate.

[0011] The trigger block cylinder is installed on the upper part of the cover plate. The trigger block linkage rod connects the trigger block cylinder and the trigger block through the holes in the cover plate. The trigger block position encoder is installed on the trigger block linkage rod. The trigger block cylinder solenoid valve is connected to the trigger block cylinder through an air pipe. The vibration generator is installed at the bottom of the container body and connected to the slide rail bracket. The slide rail cylinder and the limit mounting bracket clamp are fixed on the slide rail bracket. The limit mounting bracket clamp clamps the limit mounting bracket with clamping force. The slide rail cylinder and the limit mounting bracket clamp are connected through the slide rail cylinder linkage rod. The slide rail position encoder is connected to the slide rail cylinder linkage rod and provides feedback on the displacement of the slide rail cylinder linkage rod. The electric air source pump is connected to the trigger block cylinder solenoid valve and the slide rail cylinder solenoid valve through an air pipe to supply air to drive the limit mounting bracket clamp and the trigger block.

[0012] Each component is connected to the limit detection device and industrial control computer via cables for signal transmission.

[0013] In one specific embodiment of the present invention, the temperature transmitter collects temperature, the pressure transmitter collects pressure, and the slide rail position encoder and trigger block position encoder collect position information and feed this information back to the industrial control computer. The industrial control computer controls the heater to start and stop based on the temperature feedback, controls the water pump to start and stop based on the pressure feedback, and controls the solenoid valve to open and close based on the feedback position information, thereby controlling the action of the trigger block cylinder and the slide rail cylinder. The industrial control computer controls the vibration generator to generate vibrations of different frequencies. The limit detection device monitors the limit action and electrical information in real time and sends the data to the industrial control computer for analysis and processing.

[0014] In one specific embodiment of the present invention, the slide rail cylinder and the limiting mounting bracket clamp are fixed to the slide rail bracket by bolts.

[0015] In one specific embodiment of the present invention, the slide rail position encoder is connected to the slide rail cylinder linkage rod via a clamp and a positioning pin.

[0016] In one specific embodiment of the present invention, the limit detection device is connected to an industrial control computer via a wired connection. During the detection process, it monitors in real time the insulation resistance, dielectric strength, pre-action time and action time of the limit switch under test, and transmits the information to the industrial control computer for data analysis and recording.

[0017] In one specific embodiment of the present invention, the trigger block position encoder is mounted on the trigger block linkage rod by a clamp.

[0018] This invention provides a testing method for underwater limit switches in nuclear power plants. The testing device for underwater limit switches in nuclear power plants described above is used to verify the electrical performance and function under air environment, underwater environment and vibration conditions.

[0019] The verification of the electrical performance includes insulation resistance testing and dielectric strength testing;

[0020] The functional verification includes detection distance testing, repeatability accuracy testing, and motion time testing.

[0021] In one specific embodiment of the present invention, the following steps are included:

[0022] The underwater limit switch is installed on the detection device for the underwater limit switch of the nuclear power plant described in the above technical solution;

[0023] Conduct air environment testing;

[0024] The slide rail moves, changing the trigger distance; the trigger block moves, and the action time, insulation resistance, and dielectric strength are recorded.

[0025] Repeatedly move the trigger block action, and calculate the accuracy of the repeated action at that position based on the action data for each action;

[0026] Determine if any abnormalities are found during the test. If an abnormality is found, generate a report and assess the performance of the underwater limit switch. If no abnormalities are found, conduct an underwater environment test.

[0027] Water filling and pressure testing are performed at 0%, 25%, 50%, 75%, and 100% of the set target pressure.

[0028] The slide rail moves, changing the trigger distance; the trigger block moves, and the action time, insulation resistance, and dielectric strength are recorded.

[0029] Repeatedly move the trigger block action, and calculate the accuracy of the repeated action at that position based on the action data for each action;

[0030] Determine if there are any abnormalities in the test. If there are abnormalities, generate a report and assess the performance of the underwater limit switch. If there are no abnormalities, conduct vibration tests at different frequencies using a vibration table.

[0031] The slide rail moves, changing the trigger distance; the trigger block moves, and the action time, insulation resistance, and dielectric strength are recorded.

[0032] Repeatedly move the trigger block action, and calculate the accuracy of the repeated action at that position based on the action data for each action;

[0033] Generate a report to assess the performance of the underwater limit switch.

[0034] Compared with the prior art, the detection device and method for underwater limit switches in nuclear power plants of the present invention have the following advantages:

[0035] (1) Small size, high precision, easy to use, can accurately determine whether the electrical performance and action performance of the underwater limit switch of nuclear power plant are qualified, and identify the limit fault type to improve equipment reliability.

[0036] (2) By identifying the availability of limit switches in advance and maintaining them, we can ensure the smooth operation of fuel during the overhaul, guarantee the critical path time of the overhaul, and improve the economic efficiency of the power plant overhaul. Attached Figure Description

[0037] Figure 1 This is a component diagram of the detection device for the underwater limit switch in a nuclear power plant according to the present invention;

[0038] Figure 2 This is a wiring diagram of the detection device for the underwater limit switch in a nuclear power plant according to the present invention;

[0039] Figure 3 The test content of the detection device for the underwater limit switch of the nuclear power plant of the present invention;

[0040] Figure 4 This is a test flowchart of the detection device for the underwater limit switch in a nuclear power plant according to the present invention;

[0041] In the diagram, 1: Electric air source pump; 2: Trigger block cylinder solenoid valve; 3: Temperature transmitter; 4: Pressure transmitter; 5: Trigger block cylinder; 6: Trigger block linkage rod; 7: Water pump; 8: Water storage tank; 9: Electric heater; 10: Trigger block; 11: Slide rail cylinder solenoid valve; 12: Slide rail cylinder; 13: Slide rail cylinder linkage rod; 14: Limit mounting bracket fixture; 15: Vibration generator; 16: Limit mounting bracket; 17: Industrial control computer; 18: Slide rail position encoder; 19: Trigger block position encoder; 20: Container body; 21: Limit detection device. Detailed Implementation

[0042] To further understand the present invention, embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the present invention.

[0043] An embodiment of the present invention discloses a detection device for an underwater limit switch in a nuclear power plant, such as... Figure 1 and Figure 2 As shown, it includes:

[0044] Container body 20;

[0045] An electric heater 9 is installed on the inner wall of the container to control the temperature inside the container body 20;

[0046] The water supply storage tank 8 is connected to the water pump 7 and the container body 20;

[0047] The top cover of the container body 20 can be opened to insert the limit switch to be tested.

[0048] Temperature transmitter 3 and pressure transmitter 4 are mounted on the cover plate, and their measuring probes are installed inside the container body 20 through holes in the cover plate.

[0049] The trigger block cylinder 5 is installed on the upper part of the cover plate. The trigger block linkage rod 6 connects the trigger block cylinder 5 and the trigger block 10 through the holes in the cover plate. The trigger block position encoder 19 is installed on the trigger block linkage rod 6 by a clamp. The trigger block cylinder solenoid valve 2 is connected to the trigger block cylinder 5 through an air pipe. The vibration generator 15 is installed at the bottom of the container body 20 and connected to the slide rail bracket. The slide rail cylinder 12 and the limit mounting bracket clamp 14 are fixed to the slide rail bracket by bolts. The clamp 14 clamps the limiting mounting bracket 16 with a clamping force. The slide rail cylinder 12 is connected to the limiting mounting bracket clamp 14 through the slide rail cylinder linkage rod 13 for transmission. The slide rail position encoder 19 is connected to the slide rail cylinder linkage rod 13 through a clamp and a positioning pin and provides feedback on the displacement of the slide rail cylinder linkage rod 13. The electric air source pump 1 is connected to the trigger block cylinder solenoid valve 2 and the slide rail cylinder solenoid valve 11 through an air pipe to supply air to drive the limiting mounting bracket clamp 14 and the trigger block 10 to move.

[0050] Each component is connected to the limit detection device 21 and the industrial control computer 17 via cables for signal transmission.

[0051] The temperature transmitter 3 collects temperature, the pressure transmitter 4 collects pressure, and the slide rail position encoder 18 and the trigger block position encoder 19 collect position information and feed this information back to the industrial control computer 17. The industrial control computer 17 controls the heater 9 to start and stop based on the temperature feedback, controls the water pump 7 to start and stop based on the pressure feedback, and controls the solenoid valve to open and close based on the feedback position information, thereby controlling the action of the trigger block cylinder 5 and the slide rail cylinder 12. The industrial control computer 17 controls the vibration generator 15 to generate vibrations of different frequencies. The limit detection device 21 monitors the limit action and electrical information in real time and sends the data to the industrial control computer 17 for data analysis and processing.

[0052] The limit detection device 21 is connected to the industrial control computer 17 via a wired connection. During the detection process, it monitors the insulation resistance, dielectric strength, pre-action time and action time of the limit switch under test in real time, and transmits the information to the industrial control computer 17 for data analysis and recording.

[0053] This invention uses an industrial control computer to collect the pressure and temperature inside the container to control the start and stop of the water pump and heater, thereby realizing the influence of constant pressure and temperature in air and underwater environments on the performance of the underwater limit switch.

[0054] This invention uses a slide rail position encoder and a trigger block position encoder to identify the distance between the underwater limit switch and the trigger block, and feeds the position information back to the industrial control computer to drive the solenoid valve to control the cylinder action, thereby realizing the action performance of the underwater limit switch at different distances.

[0055] This invention verifies the electrical and operational performance of underwater limit switches by testing their insulation resistance, dielectric strength, detection distance, repeatability accuracy, and actuation time under air, underwater, and vibration conditions.

[0056] This invention also provides a method for detecting underwater limit switches in nuclear power plants, such as... Figure 3 As shown, the testing device for the underwater limit switch of the nuclear power plant described in the above technical solution is used to verify the electrical performance and function under air environment, underwater environment and vibration conditions.

[0057] The verification of the electrical performance includes insulation resistance testing and dielectric strength testing;

[0058] The functional verification includes detection distance testing, repeatability accuracy testing, and motion time testing.

[0059] like Figure 4 As shown, the specific steps include:

[0060] The underwater limit switch is installed on the detection device for the underwater limit switch of the nuclear power plant described in the above technical solution;

[0061] Conduct air environment testing;

[0062] The slide rail moves, changing the trigger distance; the trigger block moves, and the action time, insulation resistance, and dielectric strength are recorded.

[0063] Repeatedly move the trigger block action, and calculate the accuracy of the repeated action at that position based on the action data for each action;

[0064] Determine if any abnormalities are found during the test. If an abnormality is found, generate a report and assess the performance of the underwater limit switch. If no abnormalities are found, conduct an underwater environment test.

[0065] Water filling and pressure testing are performed at 0%, 25%, 50%, 75%, and 100% of the set target pressure.

[0066] The slide rail moves, changing the trigger distance; the trigger block moves, and the action time, insulation resistance, and dielectric strength are recorded.

[0067] Repeatedly move the trigger block action, and calculate the accuracy of the repeated action at that position based on the action data for each action;

[0068] Determine if there are any abnormalities in the test. If there are abnormalities, generate a report and assess the performance of the underwater limit switch. If there are no abnormalities, conduct vibration tests at different frequencies using a vibration table.

[0069] The slide rail moves, changing the trigger distance; the trigger block moves, and the action time, insulation resistance, and dielectric strength are recorded.

[0070] Repeatedly move the trigger block action, and calculate the accuracy of the repeated action at that position based on the action data for each action;

[0071] Generate a report to assess the performance of the underwater limit switch.

[0072] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0073] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A detection device for a nuclear power plant underwater limit switch, characterized by, include: Container body(20); An electric heater (9) is installed on the inner wall of the container to control the temperature inside the container body (20); The water supply storage tank (8) is connected to the water pump (7) and the container body (20); The top cover of the container body (20) can be opened to insert the limit switch to be tested. Temperature transmitter (3) and pressure transmitter (4) are mounted on the cover plate, and their measuring probes are installed inside the container body (20) through holes in the cover plate; The trigger block cylinder (5) is installed on the upper part of the cover plate. The trigger block linkage rod (6) connects the trigger block cylinder (5) and the trigger block (10) through the hole in the cover plate. The trigger block position encoder (19) is installed on the trigger block linkage rod (6). The trigger block cylinder solenoid valve (2) is connected to the trigger block cylinder (5) through an air pipe. The vibration generator (15) is installed at the bottom of the container body (20) and connected to the slide rail bracket. The slide rail cylinder (12) and the limit mounting bracket clamp (14) are fixed on the slide rail bracket. The limit mounting bracket clamp (14) clamps the limit mounting bracket (16) with a clamping force. The slide rail cylinder (12) and the limit mounting bracket clamp (14) are connected and driven by the slide rail cylinder linkage rod (13). The slide rail position encoder (18) is connected to the slide rail cylinder linkage rod (13) and provides feedback on the displacement of the slide rail cylinder linkage rod (13). The electric air source pump (1) is connected to the trigger block cylinder solenoid valve (2) through an air pipe to supply air to the trigger block linkage rod (6) and drive the trigger block (10) to move. The electric air source pump (1) is connected to the slide rail cylinder solenoid valve (11) through an air pipe to supply air to the slide rail cylinder linkage rod (13) to drive the limit mounting bracket clamp (14) to move. Each component is connected to the limit detection device (21) and the industrial control computer (17) via cable for signal transmission.

2. The detection apparatus of a nuclear power plant underwater limit switch according to claim 1, characterized by, The temperature transmitter (3) collects temperature, the pressure transmitter (4) collects pressure, the slide rail position encoder (18) and the trigger block position encoder (19) collect position information and feed this information back to the industrial control computer (17). The industrial control computer (17) controls the heater (9) to start and stop according to the temperature feedback, controls the water pump (7) to start and stop according to the pressure feedback, controls the solenoid valve to open and close according to the feedback position information, and then controls the trigger block cylinder (5) and the slide rail cylinder (12) to move. The industrial control computer (17) controls the vibration generator (15) to generate vibrations of different frequencies. The limit detection device (21) monitors the limit action and electrical information of the limit switch under test in real time and hands it over to the industrial control computer (17) for data analysis and processing.

3. The detection device for underwater limit switches in nuclear power plants according to claim 1, characterized in that, The slide rail cylinder (12) and the limiting mounting bracket clamp (14) are fixed to the slide rail bracket by bolts.

4. The detection device for underwater limit switches in nuclear power plants according to claim 1, characterized in that, The slide rail position encoder (18) is connected to the slide rail cylinder linkage rod (13) via clamps and positioning pins.

5. The detection device for underwater limit switches in nuclear power plants according to claim 1, characterized in that, The limit detection device (21) is connected to the industrial control computer (17) via a wired connection. During the detection process, it monitors the insulation resistance, dielectric strength, pre-action time and action time of the limit switch under test in real time, and transmits the information to the industrial control computer (17) for data analysis and recording.

6. The detection device for underwater limit switches in nuclear power plants according to claim 1, characterized in that, The trigger block position encoder (19) is mounted on the trigger block linkage rod (6) by a clamp.

7. A method for detecting underwater limit switches in nuclear power plants, characterized in that, Using the testing device for the underwater limit switch of a nuclear power plant as described in any one of claims 1 to 6, the electrical performance and functional performance are verified under air environment, underwater environment and vibration conditions, respectively. The verification of the electrical performance includes insulation resistance testing and dielectric strength testing; The functional verification includes detection distance testing, repeatability accuracy testing, and motion time testing.

8. The detection method for underwater limit switches in nuclear power plants according to claim 7, characterized in that, Specifically, the following steps are included: The underwater limit switch is installed on the detection device for the underwater limit switch of the nuclear power plant as described in any one of claims 1 to 6; Conduct air environment testing; The slide rail moves, changing the trigger distance; the trigger block moves, and the action time, insulation resistance, and dielectric strength are recorded. Repeatedly move the trigger block action, and calculate the accuracy of the repeated action at that position based on the action data for each action; Determine if any abnormalities are found during the test. If an abnormality is found, generate a report and assess the performance of the underwater limit switch. If no abnormalities are found, conduct an underwater environment test. Water filling and pressure testing are performed at 0%, 25%, 50%, 75%, and 100% of the set target pressure. The slide rail moves, changing the trigger distance; the trigger block moves, and the action time, insulation resistance, and dielectric strength are recorded. Repeatedly move the trigger block action, and calculate the accuracy of the repeated action at that position based on the action data for each action; Determine if there are any abnormalities in the test. If there are abnormalities, generate a report and assess the performance of the underwater limit switch. If there are no abnormalities, conduct vibration tests at different frequencies using a vibration table. The slide rail moves, changing the trigger distance; the trigger block moves, and the action time, insulation resistance, and dielectric strength are recorded. Repeatedly move the trigger block action, and calculate the accuracy of the repeated action at that position based on the action data for each action; Generate a report to assess the performance of the underwater limit switch.

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