Hydraulic slow closing device performance test system and method for check valve of nuclear power plant

Abstract

The application discloses a kind of nuclear power plant check valve hydraulic slow closing device performance test system and method, the system includes hydraulic cylinder, computer, controller, stress sensor and displacement sensor;The telescopic rod of hydraulic cylinder is connected with the piston rod of nuclear power plant check valve hydraulic slow closing device by connecting piece, the number of stress sensor is multiple, multiple stress sensors are arranged on the outer surface of the telescopic rod of hydraulic cylinder, displacement sensor is arranged on the side of the piston rod of nuclear power plant check valve hydraulic slow closing device;Computer is connected with stress sensor and displacement sensor, for obtaining and processing the signal collected by stress sensor and displacement sensor;Computer is also connected with the hydraulic servo valve of hydraulic cylinder, for obtaining the servo valve signal of hydraulic servo valve;Controller connects computer and hydraulic servo valve. The performance of the full stroke of nuclear power plant check valve hydraulic slow closing device can be tested, which can guide the maintenance adjustment of nuclear power plant check valve and analyze the performance change trend of nuclear power plant check valve.

Description

Technical Field

[0001] This invention relates to the field of nuclear power technology, and in particular to a performance testing system and method for a hydraulic slow-closing device for a check valve in a nuclear power plant. Background Technology

[0002] A check valve is a one-way fluid valve whose main function is to prevent fluid from flowing in the opposite direction; that is, it allows fluid to flow in only one direction and prevents backflow. The working principle of a check valve is to use the pressure difference of the fluid to control the opening and closing of the valve disc. When the fluid flows in the predetermined direction, the fluid pressure pushes the valve disc open, causing the valve to open. When the fluid flows in the opposite direction, the valve disc closes under the action of fluid pressure and its own weight (or spring force), preventing backflow. Check valves can be classified into different types according to their structure and working principle, such as lift check valves, swing check valves, disc check valves, ball check valves, and diaphragm check valves.

[0003] Swing check valves are a widely used type of check valve. Their valve disc is connected to a rocker arm and can rotate around the valve shaft at a certain angle. When fluid flows in a specified direction in the pipeline, if the pressure difference between the valve disc's inlet and outlet is greater than the valve disc's opening force, the valve disc is pushed away from the valve seat, and the valve is in the open state. When the pressure difference between the valve disc's inlet and outlet decreases to a certain level, the valve disc falls, and the valve is in the closed state. When the fluid flows in the opposite direction, the pressure on the valve disc's outlet side is greater than that on the inlet side, and the pressure difference presses the valve disc tightly against the valve seat, preventing fluid from passing through the valve. In the event of an unexpected pump stoppage, the liquid accelerates in the reverse direction, causing the check valve to close rapidly. This sudden closure generates severe water hammer pressure, affecting the service life of the pipeline equipment.

[0004] like Figure 1 As shown, the hydraulic slow-closing device buffers and absorbs the kinetic energy of components such as the check valve disc. It achieves the effect of slowing down and buffering the check valve by controlling the flow resistance of the hydraulic fluid through a one-way speed regulating valve between the two buffer cylinders. The working process of the hydraulic slow-closing device for the check valve includes: 1. During the check valve opening phase, the hydraulic rod of the hydraulic slow-closing device is pushed, and the hydraulic oil flows out through the N port of the left cylinder, and after passing through the one-way speed regulating valve I, it flows into the right cylinder through the K port. During this phase, the valve opens slowly, which can avoid water hammer impact during opening.

[0005] 2. After the piston moves to the point where port J opens, hydraulic oil flows into the right-side cylinder simultaneously through ports J and K, allowing the valve to open quickly and reducing the flow loss coefficient and pressure loss of the pipeline medium.

[0006] 3. As the flow rate of the medium in the pipeline decreases and the valve begins to close, the piston is pulled to the right. The hydraulic oil flows rapidly from port J / K through one-way speed control valves II and III to the left cylinder, and the valve completes the first stage of the closing process. During this process, the valve closes most of its stroke.

[0007] 4. When the piston moves to port J, port J will be blocked. The hydraulic oil can only flow to the left cylinder through port K via the one-way speed regulating valves II and III. At this time, a higher oil pressure will be generated in the left cylinder to achieve rapid deceleration and buffering of the piston, and realize the slow closing process of the check valve in the second stage.

[0008] Currently, energy power generation companies (such as nuclear power plants) widely use check valves with hydraulic slow-closing devices (sometimes called water hammer check valves). For example, four check valves are installed in the important plant water system of the nuclear power plant's cooling source to prevent water hammer or seawater backflow from causing pump reversal. During use, check valves are prone to malfunctions such as closing too quickly, causing large system pressure fluctuations and triggering alarms; closing too slowly, causing low system pressure and triggering alarms; and jamming of the buffer device, which reduces the reliability of the nuclear power plant's cooling source equipment.

[0009] Currently, maintenance in this area mainly involves routine upkeep and periodic testing. Maintenance includes checking valve sealing and valve opening and closing flexibility. However, the inspection items cannot meet the requirements for checking the valve's opening and closing performance. Therefore, during maintenance, it is necessary to repeatedly start and stop the water pump and adjust the one-way speed control valve of the hydraulic slow-closing device to ensure that the valve's opening and closing performance meets the design requirements. This process consumes a lot of manpower and resources, affects the service life of the water pump, and affects the maintenance cycle. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide a performance testing system and method for a hydraulic slow-closing device for a check valve in a nuclear power plant, addressing the shortcomings of related technologies.

[0011] The technical solution adopted by the present invention to solve its technical problem is: to construct a performance testing system for a hydraulic slow-closing device of a check valve in a nuclear power plant, including a hydraulic cylinder, a computer, a controller, a stress sensor and a displacement sensor; The telescopic rod of the hydraulic cylinder is connected to the piston rod of the hydraulic slow-closing device of the nuclear power plant check valve through a connector. There are multiple stress sensors, which are located on the outer surface of the telescopic rod of the hydraulic cylinder. The displacement sensor is located on one side of the piston rod of the hydraulic slow-closing device of the nuclear power plant check valve. The computer is connected to the stress sensor and the displacement sensor to acquire and process the signals collected by the stress sensor and the displacement sensor; the computer is also connected to the hydraulic servo valve of the hydraulic cylinder to acquire the servo valve signal of the hydraulic servo valve. The controller connects the computer to the hydraulic servo valve.

[0012] In some embodiments, the performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve further includes limit switches, wherein there are multiple limit switches, and the multiple limit switches are respectively disposed on both sides of the connector.

[0013] In some embodiments, the performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve further includes a calculator, the input of which is connected to all the stress sensors; the output of which is connected to the computer.

[0014] In some embodiments, the performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve further includes a first comparator, a second comparator, a servo amplifier, a current amplifier, and a direction control switch; All the limit switches are connected to the input terminal of the servo amplifier. The first comparator and the second comparator are both connected to the computer and the controller. The first comparator is connected to the output terminal of the computer, and the second comparator is connected to the displacement sensor. The output terminal of the servo amplifier is connected to the direction control switch, and the direction control switch is connected to the hydraulic servo valve; The current amplifier is connected to the hydraulic servo valve, the direction control switch, the computer, and the input terminal of the servo amplifier.

[0015] In some embodiments, the number of limit switches is two.

[0016] In some embodiments, the controller includes a PID controller.

[0017] In some embodiments, the hydraulic servo valve of the hydraulic cylinder is connected to a hydraulic oil source.

[0018] In some embodiments, the number of stress sensors is two.

[0019] In some embodiments, the performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve further includes a power module connected to the computer.

[0020] This invention also provides a performance testing method for a hydraulic slow-closing device of a nuclear power plant check valve, applicable to the performance testing system for the hydraulic slow-closing device of a nuclear power plant check valve described in any of the above embodiments. The performance testing method for the hydraulic slow-closing device of a nuclear power plant check valve includes: The one-way regulating valve of the hydraulic slow-closing device of the nuclear power plant check valve is adjusted. At each position, the hydraulic cylinder drives the piston rod of the hydraulic slow-closing device of the nuclear power plant check valve to move. The computer acquires and processes the signals collected by the stress sensor and the displacement sensor to obtain the opening time and closing time of the full stroke of the hydraulic slow-closing device of the nuclear power plant check valve at each position. It determines whether the opening time and closing time meet the predetermined time. If yes, the performance of the hydraulic slow-closing device of the nuclear power plant check valve meets the requirements; if not, the performance of the hydraulic slow-closing device of the nuclear power plant check valve does not meet the requirements.

[0021] The implementation of this invention has the following beneficial effects: This performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve can measure the opening and closing time of the hydraulic slow-closing device of the nuclear power plant check valve at each setting by adjusting the one-way regulating valve of the hydraulic slow-closing device of the nuclear power plant check valve. It can test the performance of the hydraulic slow-closing device of the nuclear power plant check valve throughout its entire stroke, and can guide the maintenance and adjustment of the nuclear power plant check valve and analyze the performance change trend of the nuclear power plant check valve. Attached Figure Description

[0022] To more clearly illustrate the technical solution of the present invention, the present invention 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 the present invention 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 hydraulic slow-closing device for check valves in nuclear power plants, which is part of the relevant technology. Figure 2 This is a schematic diagram of the performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve in some embodiments of the present invention. Detailed Implementation

[0023] To provide a clearer understanding of the technical features, objectives, and effects of this invention, specific embodiments 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 element referred to must have a specific orientation; therefore, they should not be construed as limitations on this invention.

[0024] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "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 invention can be understood according to the specific circumstances.

[0025] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0026] See Figure 2 This invention discloses a performance testing system for hydraulic slow-closing devices of check valves in nuclear power plants. This system can test the performance of hydraulic slow-closing devices in nuclear power plant check valves. Furthermore, this system can be used for the maintenance and adjustment of check valves designed for waterproof hammer in critical plant water systems (SEC) of nuclear power plants. During SEC system valve maintenance, the hydraulic slow-closing devices can be removed and installed into the system. The system can then test the performance of these devices, including the performance of the hydraulic slow-closing device throughout its entire stroke. Simultaneously, by adjusting the one-way regulating valve position of the hydraulic slow-closing device, the system can measure the opening and closing times of the device's entire stroke at each position, thus guiding the maintenance and adjustment of the check valve and analyzing its performance trends.

[0027] The performance testing system for the hydraulic slow-closing device of the check valve in the nuclear power plant includes a hydraulic cylinder 10, a computer 20, a controller 30, a stress sensor 40, and a displacement sensor 50.

[0028] The telescopic rod 11 of the hydraulic cylinder 10 is connected to the piston rod 201 of the hydraulic slow-closing device 200 of the nuclear power plant check valve via a connector 60. Multiple stress sensors 40 are located on the outer surface of the telescopic rod 11 of the hydraulic cylinder 10. A displacement sensor 50 is located on one side of the piston rod 201 of the hydraulic slow-closing device 200 of the nuclear power plant check valve. The connector 60 may be, but is not limited to, a coupling. (See also...) Figure 2 In some embodiments, the hydraulic servo valve 12 of the hydraulic cylinder 10 is connected to the hydraulic oil source 13.

[0029] The computer 20 is connected to the stress sensor 40 and the displacement sensor 50 to acquire and process the signals collected by the stress sensor 40 and the displacement sensor 50; the computer 20 is also connected to the hydraulic servo valve 12 of the hydraulic cylinder 10 to acquire the servo valve signal of the hydraulic servo valve 12.

[0030] The controller 30 is connected to the computer 20 and the hydraulic servo valve 12.

[0031] In this process, the one-way regulating valve of the hydraulic slow-closing device 200 of the nuclear power plant check valve is adjusted. At each position, the hydraulic cylinder 10 drives the piston rod 201 of the hydraulic slow-closing device 200 of the nuclear power plant check valve to move. The computer 20 acquires and processes the signals collected by the stress sensor 40 and the displacement sensor 50, obtains the opening time and closing time of the full stroke of the hydraulic slow-closing device 200 of the nuclear power plant check valve at each position, and determines whether the opening time and closing time meet the predetermined time. If yes, the performance of the hydraulic slow-closing device 200 of the nuclear power plant check valve meets the requirements; otherwise, the performance of the hydraulic slow-closing device 200 of the nuclear power plant check valve does not meet the requirements.

[0032] This performance testing system for the hydraulic slow-closing device of a nuclear power plant check valve can test the performance of the hydraulic slow-closing device 200 throughout its entire stroke. Simultaneously, by adjusting the position of the one-way regulating valve of the hydraulic slow-closing device 200, the system can measure the opening and closing times of the device throughout its entire stroke at each adjustment position. This information guides the maintenance and adjustment of the nuclear power plant check valve and analyzes performance trends, ensuring safe and stable operation of the check valve and effectively shortening maintenance cycles.

[0033] In this application, the hydraulic slow-closing device for the check valve in a nuclear power plant can be the hydraulic slow-closing device for the check valve against water hammer in the SEC system. Its piston rod has a force of 0.3KN and a stroke of 160mm. The force parameters and displacement control rules can be set according to its parameters. For other valves, the parameters can be set according to actual needs to meet the valve characteristics.

[0034] Specifically, the main testing object of this nuclear power plant check valve hydraulic slow-closing device performance testing system is the performance of the hydraulic slow-closing device of the check valve (such as the SEC system water hammer check valve). The main function of the hydraulic slow-closing device is to achieve slow opening / slow closing of the check valve during the opening and closing process. Therefore, this nuclear power plant check valve hydraulic slow-closing device performance testing system simulates the valve opening and closing process and measures the time control of the hydraulic slow-closing device on the valve opening and closing process. Therefore, the focus of the test is the time of the hydraulic slow-closing device's pull stroke and press stroke under the action of constant force (i.e., the corresponding slow opening / slow closing time of the valve). Different valves have different evaluation standards. For example, the SEC system water hammer check valve in this application requires an opening time ≤5S and a closing time of 3.5S~4.5S. The test data is compared with this standard to determine whether the performance of the hydraulic slow-closing device meets the requirements. Other valves can set standards according to valve performance requirements, which are not specifically limited here.

[0035] See Figure 2 In some embodiments, the number of stress sensors 40 is two. Of course, the number, location, and type of stress sensors 40 can be selected and set according to actual needs, and no specific limitation is made here.

[0036] See Figure 2 In some embodiments, the performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve also includes multiple limit switches 70, which are respectively located on both sides of the connector 60. (See also...) Figure 2 In some embodiments, the number of limit switches 70 is two. Of course, the number, location, and type of limit switches 70 can be selected and set according to actual needs, and no specific limitation is made here.

[0037] In this application, the stress sensor 40 collects a force signal, which is adjustable and can adjust the output force of the hydraulic cylinder 10 in real time according to the magnitude of the measured force. The displacement sensor 50 is used to collect a displacement signal, which is a switching signal. When the displacement reaches the test stroke (or is defined as a predetermined stroke), the test ends. The limit switch 70 has a protective function; if the test is not stopped before the stroke is exceeded, the test is forcibly stopped.

[0038] In this application, the computer 20 can obtain velocity, displacement, and force-related data during the testing process, and can generate test curves such as force-displacement curves. The velocity signal can be calculated by combining the displacement signal with the displacement-time.

[0039] See Figure 2 In some embodiments, the performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve also includes a calculator 80, the input of which is connected to all the stress sensors 40; the output of which is connected to the computer 20.

[0040] See Figure 2 In some embodiments, the performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve also includes a first comparator 90, a second comparator 100, a servo amplifier 110, a current amplifier 120, and a direction control switch 130.

[0041] All limit switches 70 are connected to the input terminal of the servo amplifier 110. The first comparator 90 and the second comparator 100 are both connected to the computer 20 and the controller 30. The first comparator 90 is connected to the output terminal of the calculator 80, and the second comparator 100 is connected to the displacement sensor 50. Preferably, the controller 30 includes a PID controller.

[0042] The output of the servo amplifier 110 is connected to the direction control switch 130, which is connected to the hydraulic servo valve 12.

[0043] The current amplifier 120 is connected to the hydraulic servo valve 12, the direction control switch 130, the computer 20, and the input terminal of the servo amplifier 110.

[0044] In this application, the computer 20 processes and analyzes the acquired force signals, displacement signals, and other signals, and sends a valve control automatic signal to the hydraulic servo valve 12. This valve control automatic signal, combined with the force and displacement signals, enables closed-loop control of the hydraulic servo valve 12. The valve control automatic signal, via the controller 30 and servo amplifier 110, controls the hydraulic servo valve 12 to perform corresponding actions. The direction control switch 130 controls the hydraulic cylinder 10 to perform a pulling / pressing action on the hydraulic slow-closing device. In some embodiments, the computer 20 can also acquire servo valve signals from the hydraulic servo valve 12, such as operating status signals.

[0045] Furthermore, the computer 20 can send automatic valve control signals to the hydraulic servo valve 12 via the controller 30. The hydraulic servo valve 12 adopts closed-loop control, including two control loops: force control and displacement control. Force control adjusts the force output of the hydraulic cylinder 10 by comparing the measured value of the stress sensor 40 with the output force of the hydraulic cylinder 10 (compared by the first comparator 90). Displacement control controls the displacement output of the hydraulic cylinder 10 by comparing the actual position of the device under test measured by the displacement sensor 50 with the given displacement of the hydraulic cylinder 10 (compared by the second comparator 100).

[0046] In this application, the difference between the actual displacement value and the target displacement value can be obtained by comparing the displacement signal with the target displacement value set in the computer 20. This difference is given to the controller 30, and the signal is amplified by the servo amplifier 110 to control the action of the hydraulic cylinder 10. The action of the hydraulic cylinder 10 includes pulling the piston rod 201 or pressing the piston rod 201.

[0047] In this application, the direction control switch 130 can be a manual switch or an automatic control switch. The direction of the direction control switch 130 can be adjusted to control the pull stroke test / compression stroke test.

[0048] In some embodiments, the performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve further includes a power supply module connected to the computer 20. The power supply module may include a 380V AC power supply and a 220V AC power supply, which control the on / off state of the hydraulic cylinder 10, the computer 20, etc., respectively.

[0049] This invention also discloses a performance testing method for a hydraulic slow-closing device of a nuclear power plant check valve, applicable to the performance testing system of the hydraulic slow-closing device of a nuclear power plant check valve in any of the above embodiments, specifically, as follows: Figure 2 As shown, the performance testing system for the hydraulic slow-closing device of the check valve in the nuclear power plant includes a hydraulic cylinder 10, a computer 20, a controller 30, a stress sensor 40, and a displacement sensor 50.

[0050] The telescopic rod 11 of the hydraulic cylinder 10 is connected to the piston rod 201 of the hydraulic slow-closing device 200 of the nuclear power plant check valve via a connector 60. Multiple stress sensors 40 are located on the outer surface of the telescopic rod 11 of the hydraulic cylinder 10. A displacement sensor 50 is located on one side of the piston rod 201 of the hydraulic slow-closing device 200 of the nuclear power plant check valve. The connector 60 may be, but is not limited to, a coupling.

[0051] The computer 20 is connected to the stress sensor 40 and the displacement sensor 50 to acquire and process the signals collected by the stress sensor 40 and the displacement sensor 50; the computer 20 is also connected to the hydraulic servo valve 12 of the hydraulic cylinder 10 to acquire the servo valve signal of the hydraulic servo valve 12.

[0052] The controller 30 is connected to the computer 20 and the hydraulic servo valve 12.

[0053] See Figure 2 In some embodiments, the performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve also includes multiple limit switches 70, which are respectively located on both sides of the connector 60. (See also...) Figure 2 In some embodiments, the number of limit switches 70 is two.

[0054] In this application, the stress sensor 40 collects a force signal, which is adjustable and can adjust the output force of the hydraulic cylinder 10 in real time according to the magnitude of the measured force. The displacement sensor 50 is used to collect a displacement signal, which is a switching signal. When the displacement reaches the test stroke (or is defined as a predetermined stroke), the test ends. The limit switch 70 has a protective function; if the test is not stopped before the stroke is exceeded, the test is forcibly stopped.

[0055] In this application, the computer 20 can obtain velocity, displacement, and force-related data during the testing process, and can generate test curves such as force-displacement curves. The velocity signal can be calculated by combining the displacement signal with the displacement-time.

[0056] See Figure 2 In some embodiments, the performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve also includes a calculator 80, the input of which is connected to all the stress sensors 40; the output of which is connected to the computer 20.

[0057] See Figure 2 In some embodiments, the performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve also includes a first comparator 90, a second comparator 100, a servo amplifier 110, a current amplifier 120, and a direction control switch 130.

[0058] All limit switches 70 are connected to the input terminal of the servo amplifier 110. The first comparator 90 and the second comparator 100 are both connected to the computer 20 and the controller 30. The first comparator 90 is connected to the output terminal of the calculator 80, and the second comparator 100 is connected to the displacement sensor 50. Preferably, the controller 30 includes a PID controller.

[0059] The output of the servo amplifier 110 is connected to the direction control switch 130, which is connected to the hydraulic servo valve 12.

[0060] The current amplifier 120 is connected to the hydraulic servo valve 12, the direction control switch 130, the computer 20, and the input terminal of the servo amplifier 110.

[0061] In this application, the computer 20 processes and analyzes the collected force signals, displacement signals, and other signals, and sends a valve control automatic signal to the hydraulic servo valve 12. This valve control automatic signal, combined with the force and displacement signals, enables closed-loop control of the hydraulic servo valve 12. The valve control automatic signal, via the controller 30 and servo amplifier 110, controls the hydraulic servo valve 12 to perform corresponding actions. The direction control switch 130 controls the hydraulic cylinder 10 to perform a pulling / pressing action on the hydraulic slow-closing device.

[0062] Furthermore, the computer 20 can send automatic valve control signals to the hydraulic servo valve 12 via the controller 30. The hydraulic servo valve 12 adopts closed-loop control, including two control loops: force control and displacement control. Force control adjusts the force output of the hydraulic cylinder 10 by comparing the measured value of the stress sensor 40 with the output force of the hydraulic cylinder 10 (compared by the first comparator 90). Displacement control controls the displacement output of the hydraulic cylinder 10 by comparing the actual position of the device under test measured by the displacement sensor 50 with the given displacement of the hydraulic cylinder 10 (compared by the second comparator 100).

[0063] In this application, the difference between the actual displacement value and the target displacement value can be obtained by comparing the displacement signal with the target displacement value set in the computer 20. This difference is given to the controller 30, and the signal is amplified by the servo amplifier 110 to control the action of the hydraulic cylinder 10. The action of the hydraulic cylinder 10 includes pulling the piston rod 201 or pressing the piston rod 201.

[0064] In this application, the direction control switch 130 can be a manual switch or an automatic control switch. The direction of the direction control switch 130 can be adjusted to control the pull stroke test / compression stroke test.

[0065] See Figure 2 In some embodiments, the hydraulic servo valve 12 of the hydraulic cylinder 10 is connected to the hydraulic oil source 13.

[0066] See Figure 2 In some embodiments, the number of stress sensors 40 is two.

[0067] In this application, the performance testing method for the hydraulic slow-closing device of the check valve in the nuclear power plant includes: The hydraulic cylinder 10 drives the piston rod 201 of the hydraulic slow-closing device 200 of the nuclear power plant check valve to move. The computer 20 acquires and processes the signals collected by the stress sensor 40 and the displacement sensor 50 to determine whether the piston rod 201 of the hydraulic slow-closing device 200 of the nuclear power plant check valve completes the predetermined stroke within a predetermined time. If so, the performance of the hydraulic slow-closing device 200 of the nuclear power plant check valve meets the requirements.

[0068] In this process, the one-way regulating valve of the hydraulic slow-closing device 200 of the nuclear power plant check valve is adjusted. At each position, the hydraulic cylinder 10 drives the piston rod 201 of the hydraulic slow-closing device 200 of the nuclear power plant check valve to move. The computer 20 acquires and processes the signals collected by the stress sensor 40 and the displacement sensor 50, obtains the opening time and closing time of the full stroke of the hydraulic slow-closing device 200 of the nuclear power plant check valve at each position, and determines whether the opening time and closing time meet the predetermined time. If yes, the performance of the hydraulic slow-closing device 200 of the nuclear power plant check valve meets the requirements; otherwise, the performance of the hydraulic slow-closing device 200 of the nuclear power plant check valve does not meet the requirements.

[0069] In this application, the hydraulic slow-closing device for the check valve in a nuclear power plant can be the hydraulic slow-closing device for the check valve against water hammer in the SEC system. Its piston rod has a force of 0.3KN and a stroke of 160mm. The force parameters and displacement control rules can be set according to its parameters. For other valves, the parameters can be set according to actual needs to meet the valve characteristics.

[0070] Specifically, the main testing object of this nuclear power plant check valve hydraulic slow-closing device performance testing system is the performance of the hydraulic slow-closing device of the check valve (such as the SEC system water hammer check valve). The main function of the hydraulic slow-closing device is to achieve slow opening / slow closing of the check valve during the opening and closing process. Therefore, this nuclear power plant check valve hydraulic slow-closing device performance testing system simulates the valve opening and closing process and measures the time control of the hydraulic slow-closing device on the valve opening and closing process. Therefore, the focus of the test is the time of the hydraulic slow-closing device's pull stroke and press stroke under the action of constant force (i.e., the corresponding slow opening / slow closing time of the valve). Different valves have different evaluation standards. For example, the SEC system water hammer check valve in this application requires an opening time ≤5S and a closing time of 3.5S~4.5S. The test data is compared with this standard to determine whether the performance of the hydraulic slow-closing device meets the requirements. Other valves can set standards according to valve performance requirements, which are not specifically limited here.

[0071] This performance testing method for the hydraulic slow-closing device of a nuclear power plant check valve can test the performance of the hydraulic slow-closing device 200 throughout its entire stroke. Furthermore, by adjusting the position of the one-way regulating valve of the hydraulic slow-closing device 200, the method can measure the opening and closing times of the device throughout its entire stroke at each adjustment position. This information can guide the maintenance and adjustment of the nuclear power plant check valve and analyze its performance trends, ensuring safe and stable operation and effectively shortening maintenance cycles.

[0072] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A performance testing system for a hydraulic slow-closing device of a check valve in a nuclear power plant, characterized in that, Includes a hydraulic cylinder (10), a computer (20), a controller (30), a stress sensor (40), and a displacement sensor (50); The telescopic rod (11) of the hydraulic cylinder (10) is connected to the piston rod (201) of the hydraulic slow-closing device (200) of the nuclear power plant check valve through a connector (60). There are multiple stress sensors (40), and multiple stress sensors (40) are located on the outer surface of the telescopic rod (11) of the hydraulic cylinder (10). The displacement sensor (50) is located on one side of the piston rod (201) of the hydraulic slow-closing device (200) of the nuclear power plant check valve. The computer (20) is connected to the stress sensor (40) and the displacement sensor (50) to acquire and process the signals collected by the stress sensor (40) and the displacement sensor (50); the computer (20) is also connected to the hydraulic servo valve (12) of the hydraulic cylinder (10) to acquire the servo valve signal of the hydraulic servo valve (12). The controller (30) is connected to the computer (20) and the hydraulic servo valve (12).

2. The performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve according to claim 1, characterized in that, The performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve also includes limit switches (70), and there are multiple limit switches (70), which are respectively located on both sides of the connector (60).

3. The performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve according to claim 2, characterized in that, The performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve also includes a calculator (80), the input of which is connected to all the stress sensors (40); the output of which is connected to the computer (20).

4. The performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve according to claim 3, characterized in that, The performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve also includes a first comparator (90), a second comparator (100), a servo amplifier (110), a current amplifier (120), and a direction control switch (130). All the limit switches (70) are connected to the input of the servo amplifier (110), the first comparator (90) and the second comparator (100) are both connected to the computer (20) and the controller (30), the first comparator (90) is connected to the output of the calculator (80), and the second comparator (100) is connected to the displacement sensor (50). The output of the servo amplifier (110) is connected to the direction control switch (130), and the direction control switch (130) is connected to the hydraulic servo valve (12). The current amplifier (120) is connected to the input terminals of the hydraulic servo valve (12), the direction control switch (130), the computer (20), and the servo amplifier (110).

5. The performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve according to claim 4, characterized in that, The number of limit switches (70) is two.

6. The performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve according to claim 4, characterized in that, The controller (30) includes a PID controller.

7. The performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve according to claim 1, characterized in that, The hydraulic servo valve (12) of the hydraulic cylinder (10) is connected to the hydraulic oil source (13).

8. The performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve according to claim 1, characterized in that, The number of stress sensors (40) is two.

9. The performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve according to claim 1, characterized in that, The performance testing system for the hydraulic slow-closing device of the nuclear power plant check valve also includes a power module connected to the computer (20).

10. A performance testing method for a hydraulic slow-closing device of a nuclear power plant check valve, applied to the performance testing system for the hydraulic slow-closing device of a nuclear power plant check valve as described in any one of claims 1 to 9, characterized in that, The performance testing method for the hydraulic slow-closing device of the nuclear power plant check valve includes: Adjust the position of the one-way regulating valve of the hydraulic slow-closing device (200) of the nuclear power plant check valve. At each position, the hydraulic cylinder (10) drives the piston rod (201) of the hydraulic slow-closing device (200) of the nuclear power plant check valve to move. The computer (20) acquires and processes the signals collected by the stress sensor (40) and the displacement sensor (50), acquires the opening time and closing time of the full stroke of the hydraulic slow-closing device (200) of the nuclear power plant check valve at each position, and determines whether the opening time and closing time meet the predetermined time. If yes, the performance of the hydraulic slow-closing device (200) of the nuclear power plant check valve meets the requirements. If no, the performance of the hydraulic slow-closing device (200) of the nuclear power plant check valve does not meet the requirements.

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