Detection device and method for underwater limit switch of nuclear power plant

Abstract

The invention relates to the technical field of nuclear power operation and maintenance, in particular to a detection device and method for an underwater limit switch of a nuclear power plant. The device is characterized in that an electric heater is mounted on the inner wall of a container; the water supply and storage tank is connected to the water pump and the container body; the temperature transmitter and the pressure transmitter are mounted on the cover plate, and a measuring probe of the temperature transmitter and the pressure transmitter is mounted inside the container body; a trigger block cylinder is installed on the upper portion of the cover plate, a trigger block linkage rod enables the trigger block cylinder and a trigger block to be in connection transmission through a cover plate hole, and a trigger block position encoder is installed on the trigger block linkage rod. The vibration generator is connected with the sliding rail support, and the sliding rail air cylinder and the limiting installation support clamp are in connection transmission through the sliding rail air cylinder linkage rod. The electric air source pump is connected with the trigger block cylinder electromagnetic valve and the slide rail cylinder electromagnetic valve; and each component is in signal transmission with the limiting detection device and the industrial personal computer. The method is used for detecting the underwater limit switch of the nuclear power plant, and equipment reliability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power operation and maintenance, and in particular to a detection device and method for an underwater limit switch of a nuclear power plant. Background Art

[0002] As one of the key equipment for refueling during the M310 unit shutdown, the reliability of the fuel transfer device will have a direct impact on the safe and stable operation of the power plant fuel. As a key measuring element of the fuel transfer device, the underwater limit switch is redundantly installed at each position to achieve precise position control of the fuel transfer device. It plays a key role in the interlocking control and system safety protection actions under abnormal conditions. If the underwater limit switch fails or the reliability is reduced during operation, it will affect the entire fuel operation process and there is a risk of fuel damage.

[0003] Therefore, there is a need for a detection device for underwater limit switches in nuclear power plants to perform performance tests on their electrical performance and functions, improve equipment reliability, and ensure safe and stable fuel operations. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a detection device and method for underwater limit switches in nuclear power plants. By using this device to detect underwater limit switches, it is possible to ensure that the insulation resistance, dielectric strength, and action time of the underwater limit switches are qualified during installation, the accuracy of repeated actions, the correctness of the installation position / distance, and the pressure bearing capacity of the underwater limit switches. This can avoid abnormal conditions such as low insulation, damage, and failure to trigger normally after the underwater limit switches are installed, and avoid damage to the safety of nuclear power plant personnel and economic benefits caused by abnormal fuel operation.

[0005] The present invention provides a detection device for an underwater limit switch of a nuclear power plant, comprising:

[0006] Container body;

[0007] The electric heater is installed on the inner wall of the container to control the temperature inside the container body;

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

[0009] The top cover of the container body can be opened to place the limit switch to be measured.

[0010] The temperature transmitter and the pressure transmitter are installed on the cover plate, and the measuring probes thereof are installed inside the container body through the holes on the cover plate;

[0011] The trigger block cylinder is installed on the upper part of the cover plate, and the trigger block linkage rod connects the trigger block cylinder and the trigger block through the hole of the cover plate for transmission, and 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 fixture are fixed on the slide rail bracket, the limit mounting bracket fixture clamps the limit mounting bracket through the clamping force, the slide rail cylinder and the limit mounting bracket fixture are connected and transmitted through the slide rail cylinder linkage rod, and the slide rail position encoder is connected to the slide rail cylinder linkage rod and feeds back 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 the air pipe to supply air to them, so as to drive the limit mounting bracket fixture and the trigger block to move;

[0012] Signal transmission is carried out between each component and the limit detection device and the industrial computer through cable connection.

[0013] In a specific embodiment of the present invention, the temperature transmitter collects temperature, the pressure transmitter collects pressure, the slide rail position encoder and the trigger block position encoder collect position information, and feeds this information back to the industrial computer. The industrial computer controls the start and stop of the heater according to the temperature feedback, controls the start and stop of the water pump according to the pressure feedback, controls the on and off of the solenoid valve according to the feedback position information, and thus controls the action of the trigger block cylinder and the slide rail cylinder; the industrial computer controls the vibration generator to generate vibrations of different frequencies; the limit detection device monitors the action and electrical information of the limit in real time, and submits the data to the industrial computer for data analysis and processing.

[0014] In a specific embodiment of the present invention, the slide rail cylinder and the limit mounting bracket fixture are fixed to the slide rail bracket by bolts.

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

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

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

[0018] The present invention provides a method for detecting an underwater limit switch of a nuclear power plant, and uses the above-mentioned technology to place the detection device of the underwater limit switch of the nuclear power plant, and respectively performs electrical performance verification and function verification in air environment, underwater environment and vibration conditions;

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

[0020] The functional verification includes a detection distance test, a repeatability accuracy test, and an action time test.

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

[0022] Installing the underwater limit switch on the detection device of 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, the trigger distance changes, the trigger block moves, and the action time, insulation resistance and dielectric strength are recorded;

[0025] The trigger block is moved repeatedly to obtain the accuracy of the repeated action at that position based on the data of each action;

[0026] Determine whether there is any abnormality in the test. If there is an abnormality, generate a report and judge the performance of the underwater limit switch; if there is no abnormality, perform underwater environmental testing;

[0027] Fill with water and pressurize according to the set target pressure of 0, 25%, 50%, 75%, 100%;

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

[0029] The trigger block is moved repeatedly to obtain the accuracy of the repeated action at that position based on the data of each action;

[0030] Determine whether there is any abnormality in the test. If there is an abnormality, generate a report and judge the performance of the underwater limit switch; if there is no abnormality, perform vibration tests with different frequencies on the vibration table;

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

[0032] The trigger block is moved repeatedly to obtain the accuracy of the repeated action at that position based on the data of each action;

[0033] Generate reports to determine underwater limit switch performance.

[0034] Compared with the prior art, the detection device and method of the underwater limit switch of a nuclear power plant of the present invention has the following beneficial effects:

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

[0036] (2) By identifying the availability of limited positions in advance and performing maintenance, we can ensure smooth fuel operations during overhaul, guarantee the critical path time of overhaul, and improve the economic efficiency of power plant overhaul. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a component diagram of the detection device of the underwater limit switch of a nuclear power plant of the present invention;

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

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

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

[0041] In the figure, 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 computer; 18: slide rail position encoder; 19: trigger block position encoder; 20: container body; 21: limit detection device. DETAILED DESCRIPTION

[0042] In order to further understand the present invention, the embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the present invention.

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

[0044] Container body 20;

[0045] The electric heater 9 is installed on the inner wall of the container and is used 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 place the limit switch to be tested.

[0048] The temperature transmitter 3 and the pressure transmitter 4 are installed on the cover plate, and their measuring probes are installed inside the container body 20 through the holes on the cover plate;

[0049] The trigger block cylinder 5 is installed on the upper part of the cover plate, and the trigger block linkage rod 6 connects the trigger block cylinder 5 with the trigger block 10 through the hole of the cover plate for transmission. The trigger block position encoder 19 is installed on the trigger block linkage rod 6 through 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 fixture 14 are fixed to the slide rail bracket by bolts, and the limit mounting bracket The clamp 14 clamps the limit mounting bracket 16 by the pressing force, the slide rail cylinder 12 and the limit mounting bracket clamp 14 are connected and transmitted through the slide rail cylinder linkage rod 13, and the slide rail position encoder 19 is connected to the slide rail cylinder linkage rod 13 through the clamp and the positioning pin and feeds back 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 the air pipe to supply air to them, so as to drive the limit 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 computer 17 via cables for signal transmission.

[0051] 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 computer 17. The industrial computer 17 controls the start and stop of the heater 9 according to the temperature feedback, controls the start and stop of the water pump 7 according to the pressure feedback, controls the on and off of the solenoid valve according to the feedback position information, and then controls the action of the trigger block cylinder 5 and the slide rail cylinder 12; the industrial 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 submits it to the industrial computer 17 for data analysis and processing.

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

[0053] The present invention collects the pressure and temperature in the container body by an industrial computer to control the start and stop of the water pump and the heater, thereby realizing the influence of constant pressure and temperature in the air environment and underwater environment on the performance of the underwater limit switch;

[0054] The present 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 back the position information to an industrial computer to drive a solenoid valve to control the cylinder action to achieve the action performance of the underwater limit switch at different distances.

[0055] The present invention verifies the electrical performance and action performance of the underwater limit switch by testing the insulation resistance, dielectric strength, detection distance, repeatability accuracy and action time of the underwater limit switch in an air environment, an underwater environment and vibration conditions.

[0056] The present invention also provides a method for detecting an underwater limit switch of a nuclear power plant, such as Figure 3 As shown, the detection device of the underwater limit switch of a nuclear power plant described in the above technical solution is used to perform electrical performance verification and functional verification in air environment, underwater environment and vibration conditions respectively;

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

[0058] The functional verification includes a detection distance test, a repeatability accuracy test, and an action time test.

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

[0060] Installing the underwater limit switch on the detection device of 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, the trigger distance changes, the trigger block moves, and the action time, insulation resistance and dielectric strength are recorded;

[0063] The trigger block is moved repeatedly to obtain the accuracy of the repeated action at that position based on the data of each action;

[0064] Determine whether there is any abnormality in the test. If there is an abnormality, generate a report and judge the performance of the underwater limit switch; if there is no abnormality, perform underwater environmental testing;

[0065] Fill with water and pressurize according to the set target pressure of 0, 25%, 50%, 75%, 100%;

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

[0067] The trigger block is moved repeatedly to obtain the accuracy of the repeated action at that position based on the data of each action;

[0068] Determine whether there is any abnormality in the test. If there is an abnormality, generate a report and judge the performance of the underwater limit switch; if there is no abnormality, perform vibration tests with different frequencies on the vibration table;

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

[0070] The trigger block is moved repeatedly to obtain the accuracy of the repeated action at that position based on the data of each action;

[0071] Generate reports to determine underwater limit switch performance.

[0072] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0073] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A detection device for underwater limit switches in a nuclear power plant, characterized in that: include: container body(20); The electric heater (9) is installed on the inner wall of the container and is used 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 place the limit switch to be measured. The temperature transmitter (3) and the pressure transmitter (4) are mounted on the cover plate, and their measuring probes are mounted inside the container body (20) through holes on 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 of the cover plate, and the trigger block position encoder (19) is installed on the trigger block linkage rod (6); the trigger block cylinder solenoid valve (2) and the trigger block cylinder (5) are connected through an air pipe; the vibration generator (15) is installed on 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, and the limit mounting bracket clamp The tool (14) clamps the limit mounting bracket (16) by means of a pressing force, the slide rail cylinder (12) and the limit mounting bracket fixture (14) are connected and transmitted via the slide rail cylinder linkage rod (13), the slide rail position encoder (19) is connected to the slide rail cylinder linkage rod (13) and feeds back 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) via an air pipe to supply air to them, thereby driving the limit mounting bracket fixture (14) and the trigger block (10) to move; Each component is connected to the limit detection device (21) and the industrial control computer (17) via cables for signal transmission.

2. The detection device for underwater limit switch of nuclear power plant according to claim 1, characterized in that: 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 feeds this information back to the industrial computer (17). The industrial computer (17) controls the start and stop of the heater (9) according to the temperature feedback, controls the start and stop of the water pump (7) according to the pressure feedback, controls the on and off of the solenoid valve according to the feedback position information, and thus controls the action of the trigger block cylinder (5) and the slide rail cylinder (12); the industrial 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 transmits the data to the industrial computer (17) for data analysis and processing.

3. The detection device for underwater limit switch of nuclear power plant according to claim 1, characterized in that: The slide rail cylinder (12) and the position limiting mounting bracket fixture (14) are fixed on the slide rail bracket by means of bolts.

4. The detection device for underwater limit switch of nuclear power plant according to claim 1, characterized in that: The slide rail position encoder (19) is connected to the slide rail cylinder linkage rod (13) via a clamp and a positioning pin.

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

6. The detection device for underwater limit switch of nuclear power plant according to claim 1, characterized in that: The trigger block position encoder (19) is installed on the trigger block linkage rod (6) via a clamp.

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

8. The method for detecting underwater limit switches in a nuclear power plant according to claim 7, characterized in that: The specific steps include: The underwater limit switch is installed on the detection device of the underwater limit switch of a nuclear power plant as claimed in any one of claims 1 to 6; Conduct air environment testing; The slide rail moves, the trigger distance changes, the trigger block moves, and the action time, insulation resistance and dielectric strength are recorded; The trigger block is moved repeatedly to obtain the accuracy of the repeated action at that position based on the data of each action; Determine whether there is any abnormality in the test. If there is an abnormality, generate a report and determine the performance of the underwater limit switch; If there is no abnormality, perform underwater environmental testing; Fill with water and pressurize according to the set target pressure of 0, 25%, 50%, 75%, 100%; The slide rail moves, the trigger distance changes, the trigger block moves, and the action time, insulation resistance and dielectric strength are recorded; The trigger block is moved repeatedly to obtain the accuracy of the repeated action at that position based on the data of each action; Determine whether there is any abnormality in the test. If there is an abnormality, generate a report and judge the performance of the underwater limit switch; if there is no abnormality, perform vibration tests with different frequencies on the vibration table; The slide rail moves, the trigger distance changes, the trigger block moves, and the action time, insulation resistance and dielectric strength are recorded; The trigger block is moved repeatedly to obtain the accuracy of the repeated action at that position based on the data of each action; Generate reports to determine underwater limit switch performance.

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