A water pressure test device for plugging valves for nuclear power

Abstract

The present invention discloses a water pressure test device for a plugging valve for nuclear power, which relates to the field of testing technology; in order to solve the problem of accuracy; it specifically includes a frame, and one side of the top of the frame is connected to two mobile frames through a linear drive mechanism, and the inner walls of the two mobile frames are respectively fixed with pressure-applying mechanisms for applying water pressure to one side of the plugging valve to be tested. The present invention sets reactants, utilizes the characteristics of water reacting with reactants to produce gas when leaking, and then monitors the pressure, thereby realizing leakage monitoring, and because the volume-mass of gas is relatively large relative to solids and liquids, even if a small leak occurs, relatively more gas will be generated, thereby realizing proportional amplification of leak detection, thereby increasing detection sensitivity, and by setting contacts, it can fit each position of the valve core of the plugging valve to be tested, so that leakage at each position can be detected, thereby increasing detection accuracy.

Description

Technical Field

[0001] The invention relates to the field of testing technology, and in particular to a water pressure testing device for a plugging valve used in nuclear power plants. Background Art

[0002] In the field of nuclear power, it is equipped with a cooling water circulation system to cool the reaction core and transfer energy. In the water circulation system, the plugging valve is a necessary component, which is used to control the on-off of the water circulation loop. Since nuclear waste water is radioactive, it will cause greater pollution when it leaks. Therefore, the air tightness of the plugging valve is required to be higher. Therefore, the plugging valve needs to be subjected to a water pressure test before use or after production.

[0003] After searching, the Chinese patent publication number CN217878321U discloses a valve testing device, including a workbench, on which an airtightness detection mechanism for low-pressure detection of the valve and a water pressure detection mechanism for high-pressure detection of the valve are arranged in parallel, and a torque testing mechanism for testing the valve torque is also arranged on one side of the workbench of the water pressure detection mechanism.

[0004] The above patent has the following deficiencies: when conducting a water pressure test, even if a plugged valve leaks, it is a small leak caused by a local defect, and the leakage is judged by observation, which greatly reduces the accuracy.

[0005] To this end, the present invention provides a water pressure test device for a plugging valve for nuclear power. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a nuclear power plugging valve water pressure test device.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A nuclear power plug valve water pressure test device, comprising a frame,

[0009] One side of the top of the frame is connected to two moving frames through a linear drive mechanism, and the inner walls of the two moving frames are respectively fixed with a pressure mechanism for applying water pressure to one side of the plugging valve to be tested and a leakage detection mechanism for detecting leakage on the other side of the plugging valve to be tested;

[0010] The leakage detection mechanism comprises a sensing tube fixed to one side of the plugging valve to be tested and a pressure gauge installed on the side wall of the sensing tube, the inner wall of the sensing tube is seamlessly welded with a sealing head, and the side wall of the sealing head is provided with uniform contacts;

[0011] The contact includes a deformation spring, a sliding rod and a flexible clamping arm. The sliding rod is slidably connected to the inner wall of the head. The deformation spring is fixed to the end of the sliding rod, and the other end of the deformation spring is buckled to the inner wall of the head. The other end of the sliding rod is fixed with multiple flexible clamping arms. The inner wall of the flexible clamping arm clamps and fixes reactants, and the reactants can react with water to generate gas.

[0012] Preferably: the reactant is any one of sodium, potassium, calcium, calcium carbide, and metal nitride.

[0013] Furthermore: the pressure-applying mechanism includes a connecting pipe fixed to the plugging valve to be tested, a water inlet pipe fixed to the top of the connecting pipe and connected to the connecting pipe, and a conical pipe fixed to the end of the connecting pipe, a one-way valve is installed on the water inlet pipe, and a pressure-applying assembly is arranged inside the conical pipe.

[0014] On the basis of the above scheme: the pressure-applying assembly includes a piston assembly movably connected to the inner wall of the conical tube, an electromagnet 1 fixed to the end of the piston assembly, and an electromagnet 2 fixed to the inner wall of the conical tube, the electromagnet 1 and the electromagnet 2 are arranged opposite to each other, and the same return spring 1 is buckled on the opposite side of the electromagnet 1 and the electromagnet 2.

[0015] A better solution among the above-mentioned solutions is: the piston assembly includes a booster piston that is sealed and slidably connected to the inner wall of the tapered tube, and a force-applying piston that is slidably connected to the inner wall of the tapered tube with a gap, and two poorly arranged levers are provided on the opposite side of the booster piston and the force-applying piston, and strip grooves are provided at both ends of the levers, and the booster piston and the force-applying piston are movably limited and matched to the inner wall of the strip groove through a limit column.

[0016] As a further solution of the present invention: the two levers are rotatably connected via an articulated shaft, the articulated shaft is rotatably connected to the inner wall of the tapered tube, and the distance between the articulated shaft and the booster piston is smaller than the distance between the articulated shaft and the force piston, and an electromagnet is fixed to the side wall of the force piston.

[0017] At the same time, the pressure-applying mechanism also includes a negative feedback pressure control component, which includes a connecting cylinder, a sensing plug, a drag block and a resistance column. The sensing plug and the drag block are both slidably connected to the inner wall of the connecting cylinder. A delay spring and a second reset spring are respectively buckled on both sides of the sensing plug. The other end of the second reset spring is buckled on the inner wall of the connecting cylinder, and the other end of the delay spring is buckled on the end face of the drag block. The connecting cylinder is welded and connected to the connecting pipe.

[0018] As a preferred embodiment of the present invention: the resistance column is fixed to the inner wall of the connecting cylinder, a conductive ring is fixed to the inner wall of the drag block, the conductive ring is in contact with the resistance column and electrically matched, electromagnet one and electromagnet two are connected in parallel to a voltage-stabilized power supply, and the conductive ring and the resistance column are connected to a branch of electromagnet one.

[0019] At the same time, the linear drive mechanism includes a motor, a bidirectional screw and a guide rod. The bidirectional screw is rotatably connected to the side wall of the frame, the guide rod is fixed to the side wall of the frame, the two movable frames are respectively connected to the two ends of the bidirectional screw through threads with opposite rotation directions, the motor is fixed to the outer wall of the frame by bolts, and the output shaft of the motor is connected to the end of the bidirectional screw through a coupling.

[0020] As a better solution of the present invention: the inner wall of the connecting pipe is rotatably connected to a valve plate for sealing the connecting pipe through a rotating shaft, a gear is fixed to the end of the rotating shaft, and the inner wall of the connecting pipe is slidably connected to a rack meshing with the gear, and the end of the rack is connected to the inner wall of the connecting pipe through a spring.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention, by setting reactants, utilizes the characteristic that water and reactants react to produce gas when leaking, and then monitors the pressure, thereby realizing leakage monitoring. Since the volume-mass ratio of gas is relatively large compared to solids and liquids, even if a small leak occurs, relatively more gas will be generated, thereby realizing proportional amplification of leak detection, thereby increasing detection sensitivity. Moreover, by setting contacts, it is possible to detect leaks at various positions of the valve core of the plugging valve to be tested, thereby increasing detection accuracy.

[0023] 2. The present invention provides a pressure mechanism which applies pressure through the magnetic force of electromagnet 1 and electromagnet 2, so that the current of electromagnet 1 and electromagnet 2 can be used to specifically adjust the pressure. At the same time, a conical tube is provided and the fluid connectivity effect of water is utilized to make the cross-sectional area of ​​the piston assembly smaller than the channel cross-sectional area of ​​the plugging valve to be tested. Therefore, when the required water pressure is constant, the required force of the piston assembly is smaller, thereby achieving the effect of energy saving and labor saving.

[0024] 3. The present invention, by configuring the piston assembly as a combination of a booster piston, a lever and a force-applying piston, utilizes the "leverage effect" of the lever, so that the magnetic force generated between electromagnet 1 and electromagnet 2 can be further amplified and applied to the booster piston, thereby further saving energy and labor.

[0025] 4. The present invention sets a negative feedback pressure control component, which is composed of a delay spring, a drag block, a conductive ring, a resistor column, etc., so as to use the change in water pressure to move the induction plug, and then use the delayed movement of the drag block to change the position of the conductive ring and the resistor column, which in turn returns to control the magnetic force of electromagnet 1 and electromagnet 2, thereby realizing negative feedback water pressure regulation, so that the water pressure is in a fluctuating state, and the fluctuation amplitude and frequency are relatively uncontrollable, that is, in a random state, so that the test is more consistent with the actual working conditions, and the authenticity and rationality of the test results are increased.

[0026] 5. The present invention, by providing structures such as valve plates, racks and gears, can automatically seal the connecting pipe when a single plugging valve to be tested is disassembled, thereby preventing leakage of water stored in the connecting pipe, so that there is no need to re-inject water during the next test, and when the next plugging valve to be tested is installed, the valve plate automatically opens, which increases the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall structure of a nuclear power plugging valve water pressure test device proposed by the present invention;

[0028] Figure 2 A schematic diagram of the structure of a pressure mechanism of a nuclear power plugging valve water pressure test device proposed by the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of a pressure component of a nuclear power plugging valve water pressure test device proposed by the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of a piston assembly of a nuclear power plugging valve water pressure test device proposed by the present invention;

[0031] Figure 5 This is a schematic diagram of the structure of a negative feedback pressure control component of a nuclear power plugging valve water pressure test device proposed by the present invention;

[0032] Figure 6 This is a schematic diagram of the structure of a leakage detection mechanism of a nuclear power plugging valve water pressure test device proposed by the present invention;

[0033] Figure 7 This is a schematic diagram of the cross-sectional structure of a contact of a nuclear power plugging valve water pressure test device proposed by the present invention;

[0034] Figure 8 A schematic diagram of the valve plate installation structure of a nuclear power plugging valve water pressure test device proposed by the present invention;

[0035] Fig. 9 This is a schematic diagram of the structure of a linear drive mechanism of a nuclear power plugging valve water pressure test device proposed by the present invention;

[0036] Fig.10 The present invention is a schematic diagram of the circuit structure of a nuclear power plugging valve water pressure test device.

[0037] In the figure: 1, frame; 2, linear drive mechanism; 3, mobile frame; 4, leakage detection mechanism; 5, blocking valve to be tested; 6, pressure mechanism; 7, connecting pipe; 8, water inlet pipe; 9, one-way valve; 10, tapered pipe; 11, pressure assembly; 12, negative feedback pressure control assembly; 13, piston assembly; 14, deformation spring; 15, electromagnet 1; 16, electromagnet 2; 17, return spring 1; 18, force-increasing piston; 19, lever; 20, force-increasing piston; 21, articulated shaft; 22, bar shaped groove; 23, limit column; 24, connecting cylinder; 25, delay spring; 26, induction plug; 27, reset spring 2; 28, drag block; 29, conductive ring; 30, resistance column; 31, induction tube; 32, pressure gauge; 33, head; 34, contact; 35, slide rod; 36, flexible clamp arm; 37, rack; 38, spring; 39, gear; 40, valve plate; 41, motor; 42, two-way screw rod; 43, guide rod; 44, water storage chamber; 45, enclosure; 46, drain valve. DETAILED DESCRIPTION

[0038] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] Embodiment 1:

[0041] A nuclear power plug valve water pressure test device, such as Figure 1-Figure 9 As shown, it includes a frame 1, and one side of the top of the frame 1 is connected to two mobile frames 3 through a linear drive mechanism 2. The inner walls of the two mobile frames 3 are respectively fixed with a pressure-applying mechanism 6 for applying water pressure to one side of the plugging valve 5 to be tested and a leakage detection mechanism 4 for detecting leakage on the other side of the plugging valve 5 to be tested.

[0042] The leakage detection mechanism 4 includes a sensing tube 31 fixed to one side of the blocking valve 5 to be tested and a pressure gauge 32 installed on the side wall of the sensing tube 31. The inner wall of the sensing tube 31 is seamlessly welded with a sealing head 33, and the side wall of the sealing head 33 is provided with uniform contacts 34.

[0043] The contact 34 includes a deformation spring 14, a slide rod 35 and a flexible clamp arm 36. The slide rod 35 is slidably connected to the inner wall of the head 33. The deformation spring 14 is fixed to the end of the slide rod 35, and the other end of the deformation spring 14 is buckled to the inner wall of the head 33. The other end of the slide rod 35 is fixed with multiple flexible clamp arms 36. The inner wall of the flexible clamp arm 36 clamps and fixes reactants, and the reactants can react with water to generate gas.

[0044] In this embodiment, the specific type of the reactant is not limited, and it can be an active metal, such as sodium, potassium, and calcium; it can also be a metal carbide, such as calcium carbide, or it can be a metal nitride, such as magnesium nitride.

[0045] When the device is in use, the plugging valve 5 to be tested is fixed to one side of the leakage detection mechanism 4 or the pressure-applying mechanism 6, and then the moving frame 3 is driven to move closer to each other by the linear drive mechanism 2 until the leakage detection mechanism 4 and the plugging valve 5 to be tested are respectively attached to the two sides of the plugging valve 5 to be tested. At this time, the other side of the plugging valve 5 to be tested can be fixed to the pressure-applying mechanism 6 or the leakage detection mechanism 4, and then water pressure is applied to one side of the plugging valve 5 to be tested by the leakage detection mechanism 4, and maintained for a certain period of time. During this process, if a leakage occurs, water will leak from the plugging valve 5 to be tested to one side of the leakage detection mechanism 4, and the leaked water will contact the reactant and then react chemically with the reactant to produce a large amount of gas, thereby increasing the inner cavity pressure of the sensing tube 31, and then the pressure change is judged by the reading of the pressure gauge 32 to detect the leakage.

[0046] The device realizes leakage monitoring by setting reactants and utilizing the characteristic that water reacts with reactants to produce gas when leaking, and then monitoring the pressure. Since the volume-mass ratio of gas is relatively large compared to solids and liquids, even a relatively small leak will produce relatively more gas, thereby realizing proportional amplification of leak detection, thereby increasing detection sensitivity. Moreover, by setting a contact 34, it can fit each position of the valve core of the plug valve 5 to be tested, thereby detecting leaks at each position, thereby increasing detection accuracy.

[0047] To solve the pressure problem; Figure 2 , 3 As shown, the pressure-applying mechanism 6 includes a connecting pipe 7 fixed to the plugging valve 5 to be tested, a water inlet pipe 8 fixed to the top of the connecting pipe 7 and connected to the connecting pipe 7, and a conical tube 10 fixed to the end of the connecting pipe 7, a one-way valve 9 is installed on the water inlet pipe 8, and a pressure-applying assembly 11 is arranged inside the conical tube 10.

[0048] The pressure-applying assembly 11 includes a piston assembly 13 movably connected to the inner wall of the conical tube 10, an electromagnet 15 fixed to the end of the piston assembly 13, and an electromagnet 2 16 fixed to the inner wall of the conical tube 10. The electromagnet 15 and the electromagnet 2 16 are arranged opposite to each other, and the same return spring 17 is buckled on the opposite side of the electromagnet 15 and the electromagnet 2 16.

[0049] When pressurizing, water can be first injected into the water inlet pipe 8. This process can be performed by pumping or manually. It is a prior art and will not be elaborated in this embodiment. After the connecting pipe 7, the water inlet pipe 8 and the tapered tube 10 are filled with water, the one-way valve 9 is closed. At this time, the electromagnet 15 and the electromagnet 2 16 are energized, and the magnetic force generated between the electromagnet 15 and the electromagnet 2 16 is applied to the piston assembly 13 through the interface, so that the piston assembly 13 is used to pressurize the water source, thereby applying water pressure to the plugging valve 5 to be tested.

[0050] The device, by setting a pressure mechanism 6, applies pressure through the magnetic force of electromagnet 15 and electromagnet 2 16, so that the current of electromagnet 15 and electromagnet 2 16 can be used to specifically adjust the pressure. At the same time, by setting a tapered tube 10 and utilizing the fluid connectivity effect of water, the cross-sectional area of ​​the piston assembly 13 can be made smaller than the channel cross-sectional area of ​​the plugging valve 5 to be tested. Therefore, when the required water pressure is constant, the required force of the piston assembly 13 is smaller, thereby achieving the effect of energy saving and labor saving.

[0051] The piston assembly 13 includes a booster piston 18 that is sealed and slidably connected to the inner wall of the tapered tube 10, and a force-applying piston 20 that is slidably connected to the inner wall of the tapered tube 10 with a gap. Two poorly arranged levers 19 are provided on the opposite side of the booster piston 18 and the force-applying piston 20. Both ends of the lever 19 are provided with a strip groove 22. The booster piston 18 and the force-applying piston 20 are movably limited and matched to the inner wall of the strip groove 22 through a limit column 23.

[0052] The two levers 19 are rotatably connected via an articulated shaft 21, which is rotatably connected to the inner wall of the tapered tube 10, and the distance between the articulated shaft 21 and the booster piston 18 is smaller than the distance between the articulated shaft 21 and the force piston 20, and the electromagnet 15 is fixed to the side wall of the force piston 20.

[0053] When magnetic force is generated between the electromagnet 15 and the electromagnet 2 16 , the magnetic force is applied to the force applying piston 20 , thereby transmitting the force through the lever 19 and applying the magnetic force to the force amplifying piston 18 .

[0054] The device, by configuring the piston assembly 13 as a combination of a booster piston 18, a lever 19 and a force-applying piston 20, utilizes the "leverage effect" of the lever 19, so that the magnetic force generated between the electromagnet 15 and the electromagnet 2 16 can be further amplified and applied to the booster piston 18, thereby further saving energy and labor.

[0055] In actual use, when the plugging valve 5 to be tested is installed in the water circulation system and is in a closed state, the water pressure on the plugging side is affected by the temperature, environment, and vibration of the pipeline and is in a fluctuating state, and the magnitude of the fluctuation is relatively random. Therefore, when the water pressure fluctuates, the plugging valve 5 to be tested will be impacted. If the static pressure is directly used for testing, it will not match the actual working conditions, resulting in distortion of the test results. In order to solve the problem of dynamic pressure testing; Figure 2 As shown, the pressure mechanism 6 also includes a negative feedback pressure control component 12, and the negative feedback pressure control component 12 includes a connecting cylinder 24, a sensing plug 26, a drag block 28 and a resistor column 30. The sensing plug 26 and the drag block 28 are both slidably connected to the inner wall of the connecting cylinder 24. The two sides of the sensing plug 26 are respectively buckled with a delay spring 25 and a return spring 27. The other end of the return spring 27 is buckled to the inner wall of the connecting cylinder 24, and the other end of the delay spring 25 is buckled to the end face of the drag block 28. The connecting cylinder 24 is welded and connected to the connecting pipe 7.

[0056] The resistor column 30 is fixed to the inner wall of the connecting cylinder 24, and a conductive ring 29 is fixed to the inner wall of the drag block 28. The conductive ring 29 is in contact with the resistor column 30 and electrically matched. The electromagnet 15 and the electromagnet 2 16 are connected in parallel to the voltage-stabilized power supply, and the conductive ring 29 and the resistor column 30 are connected to the branch of the electromagnet 15.

[0057] During the detection, the voltage-stabilized power supply is started, which instantly generates a magnetic field between the electromagnet 15 and the electromagnet 2 16, thereby instantly establishing water pressure. At this time, the water pressure will also be transmitted to the inner cavity of the connecting cylinder 24 and applied to the sensing plug 26. The sensing plug 26 will move, thereby driving the drag block 28 to move through the delay spring 25. In this process, the moving direction of the sensing plug 26 will be related to the magnitude of the water pressure, and the drag block 28 and the sensing plug 26 transmit the force through the flexible delay spring 25, so that the movement of the drag block 28 has a delay relative to the movement of the sensing plug 26. The water pressure increases from zero to sometime, the induction plug 26 moves, and the drag block 28 moves with a delay after the induction plug 26, thereby driving the conductive ring 29 to move, so that the resistance value of the resistor column 30 connected to the electromagnet 15 increases, so that the partial pressure of the electromagnet 15 decreases, and the magnetic field of the electromagnet 15 decreases, thereby reducing the water pressure. Once the water pressure decreases, the induction plug 26 has the movement to return, and the drag block 28 will return with a delay, so that the partial pressure of the electromagnet 15 increases again, and so on and so forth, causing the water pressure to fluctuate, and the fluctuation amplitude and frequency are relatively uncontrollable, that is, it is in a random state.

[0058] The device is provided with a negative feedback pressure control component 12, which is composed of a delay spring 25, a drag block 28, a conductive ring 29, a resistor column 30, etc., so as to utilize the change of water pressure to move the induction plug 26, and then utilize the delayed movement of the drag block 28 to change the position of the conductive ring 29 and the resistor column 30, so as to return to control the magnetic force of the electromagnet 15 and the electromagnet 2 16 in turn, so as to realize negative feedback water pressure regulation, so that the water pressure is in a fluctuating state, and the fluctuation amplitude and frequency are relatively uncontrollable, that is, in a random state, so that the test is more consistent with the actual working conditions, and the authenticity and rationality of the test results are increased.

[0059] To solve the driver problem; Fig. 9 As shown, the linear drive mechanism 2 includes a motor 41, a bidirectional screw 42 and a guide rod 43, the bidirectional screw 42 is rotatably connected to the side wall of the frame 1, the guide rod 43 is fixed to the side wall of the frame 1, the two moving frames 3 are respectively connected to the two ends of the bidirectional screw 42 through threads with opposite rotation directions, the motor 41 is fixed to the outer wall of the frame 1 by bolts, and the output shaft of the motor 41 is connected to the end of the bidirectional screw 42 through a coupling.

[0060] A surrounding plate 45 is fixed to the bottom of the frame 1 , a water storage chamber 44 is formed between the frame 1 and the surrounding plate 45 , and a drainage valve 46 is fixed to the bottom side wall of the surrounding plate 45 .

[0061] When the motor 41 is started, it can drive the bidirectional screw rod 42 to rotate, thereby driving the two moving frames 3 to move synchronously in opposite directions.

[0062] The water storage chamber 44 can collect water that drips or flows during the experiment to prevent environmental pollution, and the drain valve 46 can discharge the collected water.

[0063] When the present embodiment is in use, the plugging valve 5 to be tested is fixed to one side of the leakage detection mechanism 4 or the pressure mechanism 6, and then the moving frame 3 is driven to move closer to each other by the linear drive mechanism 2 until the leakage detection mechanism 4 and the plugging valve 5 to be tested are respectively attached to the two sides of the plugging valve 5 to be tested. At this time, the other side of the plugging valve 5 to be tested can be fixed to the pressure mechanism 6 or the leakage detection mechanism 4, and then the water pressure is applied to one side of the plugging valve 5 to be tested by the leakage detection mechanism 4. When pressurizing, water can be first injected into the water inlet pipe 8. This process can be performed by pumping or manually. It is a prior art and will not be described in detail in the present embodiment. After the connecting pipe 7, the water inlet pipe 8 and the conical tube 10 are filled with water, the one-way valve is closed. 9. At this time, the electromagnet 15 and the electromagnet 2 16 are energized, and the interface is connected through the magnetic force generated between the electromagnet 15 and the electromagnet 2 16. When the magnetic force is generated between the electromagnet 15 and the electromagnet 2 16, the magnetic force is applied to the force-applying piston 20, so that the force is transmitted through the lever 19, and the magnetic force is applied to the force-increasing piston 18, so that the force-increasing piston 18 is used to pressurize the water source, thereby applying water pressure to the plugging valve 5 to be tested, and the pressure is maintained for a certain time. During this process, if a leak occurs, water will leak from the plugging valve 5 to be tested to one side of the leakage detection mechanism 4, and the leaked water will contact the reactant, and then react chemically with the reactant to produce a large amount of gas, thereby making the sensor The pressure in the inner cavity of the pipe 31 increases, and the pressure change is judged by the reading of the pressure gauge 32, so as to detect the leakage. During the detection, the voltage-stabilized power supply is started, and the electromagnet 15 and the electromagnet 2 16 generate a magnetic field instantly, so that the water pressure is instantly established. At this time, the water pressure will also be transmitted to the inner cavity of the connecting cylinder 24 and applied to the induction plug 26. The induction plug 26 will move, thereby driving the drag block 28 to move through the delay spring 25. In this process, the moving direction of the induction plug 26 is related to the magnitude of the water pressure, and the drag block 28 and the induction plug 26 transmit the force through the flexible delay spring 25, so that the drag block 28 The movement of the sensor plug 26 is delayed relative to that of the sensor plug 26. When the water pressure increases from zero to some pressure, the sensor plug 26 moves, and the drag block 28 moves with a delay after the sensor plug 26, thereby driving the conductive ring 29 to move, so that the resistance value of the resistor column 30 connected to the electromagnet 15 increases, so that the partial pressure of the electromagnet 15 decreases, and the magnetic field of the electromagnet 15 decreases, thereby reducing the water pressure. Once the water pressure decreases, the sensor plug 26 has a return movement, and the drag block 28 will return with a delay, so that the partial pressure of the electromagnet 15 increases again, and so on and so forth, causing the water pressure to fluctuate, and the fluctuation amplitude and frequency are relatively uncontrollable, that is, it is in a random state.

[0064] Embodiment 2:

[0065] A nuclear power plug valve water pressure test device, such as Figure 8 As shown, in order to solve the convenience problem; this embodiment makes the following improvements on the basis of embodiment 1: the inner wall of the connecting pipe 7 is rotatably connected to a valve plate 40 for sealing the connecting pipe 7 through a rotating shaft, a gear 39 is fixed to the end of the rotating shaft, and the inner wall of the connecting pipe 7 is slidably connected to a rack 37 meshing with the gear 39, and the end of the rack 37 is connected to the inner wall of the connecting pipe 7 through a spring 38.

[0066] When this embodiment is in use, after the blocking valve 5 to be tested is installed with the connecting pipe 7, the blocking valve 5 to be tested will squeeze the end surface of the connecting pipe 7, so that the rack 37 is squeezed into the interior of the connecting pipe 7. During this process, the gear 39 will rotate to drive the valve plate 40 to rotate, thereby opening the connecting pipe 7. When the connecting pipe 7 and the blocking valve 5 to be tested are disassembled, the rack 37 is moved outward by the elastic force of the spring 38, thereby driving the valve plate 40 to rotate to block the connecting pipe 7.

[0067] Since multiple samples will be tested during actual testing, the device is equipped with structures such as valve plate 40, rack 37 and gear 39. When a single plugging valve 5 to be tested is disassembled, the connecting pipe 7 can be automatically blocked, thereby preventing the water stored in the connecting pipe 7 from leaking, so that there is no need to re-inject water during the next test, and when the next plugging valve 5 to be tested is installed, the valve plate 40 automatically opens, which increases the convenience of use.

[0068] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A nuclear power plugging valve hydraulic test device, comprising a frame (1), characterized in that: One side of the top of the frame (1) is connected to two moving frames (3) via a linear drive mechanism (2), and the inner walls of the two moving frames (3) are respectively fixed with a pressure mechanism (6) for applying water pressure to one side of the plugging valve (5) to be tested and a leakage detection mechanism (4) for detecting leakage on the other side of the plugging valve (5) to be tested; The leakage detection mechanism (4) comprises a sensing tube (31) fixed to one side of the plugging valve (5) to be tested and a pressure gauge (32) installed on the side wall of the sensing tube (31); a sealing head (33) is seamlessly welded to the inner wall of the sensing tube (31); and a uniform contact (34) is arranged on the side wall of the sealing head (33); The contact (34) comprises a deformation spring (14), a slide rod (35) and a flexible clamp arm (36); the slide rod (35) is slidably connected to the inner wall of the sealing head (33); the deformation spring (14) is fixed to the end of the slide rod (35), and the other end of the deformation spring (14) is buckled to the inner wall of the sealing head (33); the other end of the slide rod (35) is fixed with a plurality of flexible clamp arms (36); the inner wall of the flexible clamp arm (36) clamps and fixes a reactant, and the reactant can react with water to generate gas; The pressure-applying mechanism (6) comprises a connecting pipe (7) fixed to the plugging valve (5) to be tested, a water inlet pipe (8) fixed to the top of the connecting pipe (7) and connected to the connecting pipe (7), and a conical pipe (10) fixed to the end of the connecting pipe (7) and fixed to one of the movable frames (3), a one-way valve (9) being installed on the water inlet pipe (8), and a pressure-applying assembly (11) being arranged inside the conical pipe (10); The pressure-applying assembly (11) comprises a piston assembly (13) movably connected to the inner wall of the conical tube (10), an electromagnet 1 (15) fixed to the end of the piston assembly (13), and an electromagnet 2 (16) fixed to the inner wall of the conical tube (10), wherein the electromagnet 1 (15) and the electromagnet 2 (16) are arranged opposite to each other, and the electromagnet 1 (15) and the electromagnet 2 (16) are buckled with a same return spring 1 (17) on opposite sides thereof; The piston assembly (13) comprises a booster piston (18) which is sealed and slidably connected to the inner wall of the tapered tube (10) and a force-applying piston (20) which is slidably connected to the inner wall of the tapered tube (10) with a gap, two levers (19) arranged in a relatively poor arrangement are arranged on the opposite side of the booster piston (18) and the force-applying piston (20), both ends of the lever (19) are provided with strip grooves (22), and the booster piston (18) and the force-applying piston (20) are movably limited and matched to the inner wall of the strip groove (22) through a limit column (23); The two levers (19) are rotatably connected via a hinge shaft (21), the hinge shaft (21) is rotatably connected to the inner wall of the conical tube (10), and the distance between the hinge shaft (21) and the booster piston (18) is smaller than the distance between the hinge shaft (21) and the force piston (20), and the electromagnet (15) is fixed to the side wall of the force piston (20).

2. A nuclear power plugging valve hydraulic test device according to claim 1, characterized in that: The reactant is any one of sodium, potassium, calcium, calcium carbide, and metal nitride.

3. A nuclear power plugging valve hydraulic test device according to claim 1, characterized in that: The pressure mechanism (6) also includes a negative feedback pressure control component (12), which includes a connecting cylinder (24), a sensing plug (26), a drag block (28) and a resistor column (30). The sensing plug (26) and the drag block (28) are both slidably connected to the inner wall of the connecting cylinder (24). The two sides of the sensing plug (26) are respectively buckled with a delay spring (25) and a second return spring (27). The other end of the second return spring (27) is buckled to the inner wall of the connecting cylinder (24), and the other end of the delay spring (25) is buckled to the end surface of the drag block (28). The connecting cylinder (24) is welded and connected to the connecting pipe (7).

4. A nuclear power plugging valve hydraulic test device according to claim 3, characterized in that: The resistor column (30) is fixed to the inner wall of the connecting cylinder (24), a conductive ring (29) is fixed to the inner wall of the drag block (28), the conductive ring (29) is in contact with the resistor column (30) and electrically matched, the first electromagnet (15) and the second electromagnet (16) are connected in parallel to a voltage-stabilized power supply, and the conductive ring (29) and the resistor column (30) are connected to a branch of the first electromagnet (15).

5. A nuclear power plugging valve hydraulic test device according to claim 1, characterized in that: The linear drive mechanism (2) comprises a motor (41), a bidirectional screw rod (42) and a guide rod (43); the bidirectional screw rod (42) is rotatably connected to the side wall of the frame (1); the guide rod (43) is fixed to the side wall of the frame (1); the two movable frames (3) are respectively connected to the two ends of the bidirectional screw rod (42) through threads with opposite rotation directions; the motor (41) is fixed to the outer wall of the frame (1) through bolts; and the output shaft of the motor (41) is connected to the end of the bidirectional screw rod (42) through a coupling.

6. A nuclear power plugging valve hydraulic test device according to claim 3, characterized in that: The inner wall of the connecting pipe (7) is rotatably connected to a valve plate (40) for sealing the connecting pipe (7) via a rotating shaft, a gear (39) is fixed to the end of the rotating shaft, and the inner wall of the connecting pipe (7) is slidably connected to a rack (37) meshing with the gear (39), and the end of the rack (37) is connected to the inner wall of the connecting pipe (7) via a spring (38).

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