Quick leak detection device for valve

Abstract

The invention, which relates to the technical field of valve detection, discloses a rapid leak detection apparatus for a valve, comprising: a control box on which a control unit and a gas supply module are integrated, the control unit being configured to coordinate the time sequence action and data processing of each module; the switch operation module comprises a switch clamping module which is rotationally mounted in the center of the top of the control box through a rotary driving module, and the switch clamping module is used for clamping a valve switch and can drive the valve switch to rotate under the driving of the rotary driving module; the bearing module comprises a first V-shaped positioning groove and a second V-shaped positioning groove which are symmetrically formed in the two sides of the switch clamping module; and the plugging execution module comprises a first plugging unit and a second plugging unit. Dynamic and static detection data comparison is taken as a core, the bottleneck of a traditional leakage detection method is broken through, type judgment, position positioning and working condition coverage three-in-one accurate diagnosis of valve leakage is realized, and efficient data support is provided for valve maintenance.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of valve detection, in particular to a valve rapid leak detection device. BACKGROUND

[0002] As a key component of fluid control systems, the sealing performance of valves directly affects the safety and efficiency of industrial equipment. Traditional valve leak detection methods have significant limitations: First, most rely on static pressure holding tests, which can only detect overall leaks and cannot distinguish between internal leaks (valve seal surface failure) and external leaks (valve body / connection leaks), making it difficult to capture leaks during the opening and closing of the valve; second, manual fixing of the valve, adjustment of the plugging device, and recording of pressure data are required, which is inefficient and prone to human error; third, static and dynamic leak data are separated, making it difficult to accurately locate the source of the leak, resulting in insufficient repair targeting.

[0003] Therefore, there is an urgent need for a rapid leak detection device that integrates automatic control, multi-mode detection, and intelligent data analysis to improve the accuracy and efficiency of valve leak diagnosis. SUMMARY

[0004] The purpose of the present application is to provide a valve rapid leak detection device to solve the problems raised in the background.

[0005] To achieve the above-mentioned purposes, the application adopts the following technical solutions: The valve rapid leak detection device provided by the application comprises: A control box integrated with a control unit and a gas supply module, the control unit is configured to coordinate the timing action and data processing of each module; A switch operation module comprising a switch clamping module installed at the center of the top of the control box through a rotary drive module, the switch clamping module is used to clamp the valve switch and can drive the valve switch to rotate under the drive of the rotary drive module; A supporting module comprising a first V-shaped positioning groove and a second V-shaped positioning groove symmetrically arranged on both sides of the switch clamping module; A plugging execution module comprising a first plugging unit and a second plugging unit, the first plugging unit and the second plugging unit are respectively configured to move horizontally along the supporting module to seal the two ends of the valve; the first plugging unit and the second plugging unit are structurally identical, and each has a three-way gas path system inside, the three-way gas path system has a gas injection interface, a pressure output interface, and a pressure relief interface, the gas injection interface is connected to the gas supply module through a pipeline; the three-way gas path system is provided with a pressure regulating structure for automatically switching the opening and closing state of the pressure relief interface in response to the injection pressure; The dynamic detection module is configured to realize three detection modes: single injection detection through the first blocking unit and opening of the pressure relief port of the second blocking unit when the valve is fully closed, single injection detection through the second blocking unit and opening of the pressure relief port of the first blocking unit when the valve is fully closed, and bilateral synchronous injection detection during gradual rotation of the valve, and real-time monitoring of pressure fluctuation data.

[0006] Further, the control unit comprises a PLC controller and a man-machine interface, the PLC controller is pre-installed with a detection program, can receive pressure data of the dynamic detection module and output control instructions, the man-machine interface is used for displaying detection parameters, pressure curves and detection results, and can manually input or modify detection parameters; the gas supply module comprises a gas source generator, a pressure regulating valve, a filter and an electromagnetic valve group connected in sequence, the electromagnetic valve group is electrically connected with the control unit, and is used for controlling gas supply to the gas injection interface of the first blocking unit or the second blocking unit.

[0007] Further, the rotation driving module comprises a servo motor, a speed reducer, a rotating shaft and an angle sensor, the servo motor is electrically connected with the control unit, a servo motor output shaft is connected with an input end of the speed reducer through a shaft coupling, an output end of the speed reducer is fixedly connected with one end of the rotating shaft, the other end of the rotating shaft is fixedly connected with the switch clamping module, and the angle sensor is installed on the rotating shaft and used for real-time detection of a rotating angle and feedback to the control unit.

[0008] Further, the switch clamping module comprises a circular clamping seat and a pair of clamping strips symmetrically and slidably installed on the circular clamping seat, adjusting screws are arranged through the pair of clamping strips, and a clamping groove for clamping the valve switch is formed between the pair of clamping strips.

[0009] Further, the first V-shaped positioning groove and the second V-shaped positioning groove each comprise a groove body and an anti-skid pad, the groove body is V-shaped in cross section, and the anti-skid pad is attached to the inner side wall of the groove body, the anti-skid pad is made of polyurethane and has anti-skid lines on the surface.

[0010] Further, the first blocking unit and the second blocking unit each comprise a positioning seat, a gas cylinder horizontally installed on the positioning seat, and a blocking disc member fixedly connected to the gas cylinder.

[0011] Further, the blocking disc member comprises a metal disc body and a sealing pad, the sealing pad is annular in structure, is made of fluoroelastomer or acrylonitrile-butadiene rubber, is fixed to one side of the metal disc body facing the valve through a bolt, and has an inner diameter smaller than an outer diameter of the valve inlet.

[0012] Furthermore, the pressure regulating structure includes a solenoid valve installed at the pressure relief port. The solenoid valve is electrically connected to the control unit. When the control unit controls the gas injection port to inject gas, the solenoid valve closes to block the pressure relief port. When the control unit controls the gas injection port to stop injecting gas, the solenoid valve opens to release the blockage of the pressure relief port.

[0013] Furthermore, the dynamic detection module includes a pressure sensor, a data acquisition card, and a data processing unit. The pressure sensor is a high-precision diffused silicon pressure sensor, whose detection end is connected to the pressure output interface of the three-way gas circuit system, and its output end is connected to the data acquisition card through a signal line. The data acquisition card is electrically connected to the data processing unit. The data processing unit can convert pressure data into a pressure fluctuation curve and compare it with a preset threshold to determine whether there is a leak. It can also record the valve opening and closing angle when a leak occurs.

[0014] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects: 1. This invention combines static dual-end independent detection with dynamic rotation data, and accurately distinguishes the leakage type through logical comparison (e.g., leakage at only one end is judged as external leakage, and leakage at both ends and no leakage in the dynamic closed state is judged as internal leakage); while in dynamic mode, it correlates with angle sensor data to capture abnormal pressure fluctuations in real time during the switch rotation process and lock the location of external leakage (e.g., valve body connection or switch movement gap).

[0015] 2. This invention features static single-sided air injection and depressurization on the other side, independently evaluating the valve end face sealing performance; during valve opening and closing rotation, air is injected on both sides, pressure fluctuations are monitored in real time, and dynamic leakage points are identified; static and dynamic data comparison and analysis eliminate misjudgments and improve the reliability of conclusions.

[0016] 3. The switch snap-fit ​​module of the present invention allows for flexible adjustment of the snap-fit ​​groove width by adjusting the screw, which can be adapted to valve switches of different sizes; the V-shaped positioning groove of the support module utilizes the principle of inclined plane self-centering, combined with the anti-slip pad design, to stably support valves of different specifications, eliminating the need for frequent replacement of positioning components and significantly improving the ease of operation.

[0017] 4. The rotary drive module of this invention uses a combination of servo motor and reducer, along with real-time feedback from the angle sensor, to ensure precise control of valve rotation. The cylinder drive and sealing gasket design of the sealing execution module ensure the reliability of the seal. The filter component of the air supply module effectively removes gas impurities, avoiding the impact of gas contamination on the detection results, thus improving the overall stability and reliability of the detection system.

[0018] In summary, this invention, with the comparison of dynamic and static detection data as its core, breaks through the bottleneck of traditional leak detection methods and achieves a precise diagnosis of valve leaks in three aspects: type identification, location positioning, and operating condition coverage, providing efficient data support for valve maintenance.

[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the switch operation module structure of the present invention; Figure 3 This is a schematic diagram of the three-way air passage system and the second sealing unit of the present invention; Figure 4 This is a schematic diagram of the detection structure of the present invention; Figure 5 This is a schematic diagram of the switch operation module of the present invention when it is connected to a valve.

[0022] In the picture: 1-Control box; 11-Control unit; 2-Switch operation module; 21-Rotary drive module; 22-Servo motor; 23-Reducer; 24-Rotation shaft; 25-Angle sensor; 22-Switch latching module; 221-Circular latch; 222-Latch bar; 223-Adjusting screw; 224-Latching groove; 3-Support module; 31-First V-shaped positioning groove; 32-Second V-shaped positioning groove; 4-Blocking execution module; 41-First blocking unit; 411-Positioning seat; 412-Cylinder; 413-Blocking disc component; 4131-Metal disc body; 4132-Sealing gasket; 42-Second blocking unit; 43-Three-way air circuit system; 431-Gas injection interface; 432-Pressure output interface; 433-Pressure relief interface; 434-Pressure adjustment structure. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0024] Please see Figures 1-5The present invention provides a valve rapid leak detection device, including a control box 1, a switch operation module 2, a support module 3, a sealing execution module 4, and a dynamic detection module.

[0025] The control unit 11 and the gas supply module are integrated on the control box 1. The control unit 11 plays a key role in coordinating the timing actions and data processing of each module. It can issue instructions to the switch operation module 2, the sealing execution module 4, the dynamic detection module, etc. according to the preset program to ensure the orderly connection of each link. At the same time, it processes the pressure data transmitted by the dynamic detection module to determine whether the valve is leaking (for example, when the pressure drops more than the preset threshold within the set pressure holding time, it is determined that there is a leak). It can also accurately determine whether the valve is internally or externally leaking by comparing the data of the static detection mode and the dynamic detection mode. Internal leakage refers to the leakage of gas through the valve switch when the valve is closed, and external leakage refers to the leakage of the valve body and the switch. The gas supply module (not shown) provides gas that meets the detection requirements to the sealing execution module 4 through the pipeline as the source of the leak detection medium.

[0026] The switch operation module 2 is responsible for the fixing and rotation control of the valve switch. The rotation drive module 21 provides rotational power to the switch snap-fit ​​module 22, enabling it to drive the snap-fit ​​valve switch to rotate. The switch snap-fit ​​module 22 is adapted to valve switches of different specifications. The snap-fit ​​fixing ensures that the valve switch does not undergo relative displacement during rotation, thus ensuring the accuracy of valve switch status adjustment during the detection process.

[0027] The first V-shaped positioning groove 31 and the second V-shaped positioning groove 32 of the support module 3 are symmetrically distributed on both sides of the switch snap-fit ​​module 22. Its V-shaped structure utilizes the principle of inclined plane self-centering to provide preliminary positioning support for the flanges at both ends of the valve, so that the valve remains stable during the testing process, providing a basis for the sealing operation of the subsequent sealing execution module 4.

[0028] The first sealing unit 41 and the second sealing unit 42 of the sealing execution module 4 correspond to the two ends of the valve, respectively. Both can move horizontally along the support module 3 to achieve sealing of both ends of the valve. The three-way gas circuit system 43 inside each sealing unit is the key to gas flow and control. Among them, the gas injection interface 431 is connected to the gas supply module of the control box 1 through the pipeline to receive the detection gas; the pressure output interface 432 is directly connected to the inner cavity of the valve to introduce gas into the valve; and the pressure relief interface 433 is used to discharge residual gas in the cavity.

[0029] The pressure regulating structure 434 inside the three-way gas circuit system 43 can automatically switch the opening and closing state of the pressure relief port 433 in response to the injection pressure. When gas is injected, the pressure relief port 433 closes under pressure to ensure that all gas enters the valve cavity; when gas injection stops, the pressure relief port 433 automatically opens to quickly discharge residual gas.

[0030] The core function of the dynamic detection module is to implement three detection modes and monitor pressure fluctuations: With the valve fully closed, air can be injected through the first sealing unit 41 alone. At this time, the pressure relief port of the second sealing unit 42 remains open, and the sealing performance of one end of the valve is detected by monitoring pressure changes. Similarly, when the valve is fully closed, air can be injected through the second sealing unit 42 alone. At this time, the pressure relief port of the first sealing unit 41 remains open. The sealing performance of one end of the valve can be detected by monitoring pressure changes, and the sealing performance of the other end of the valve can be detected by injecting air through the second sealing unit 42 alone. As the valve switch is gradually rotated by the rotary drive module 21, air is injected simultaneously on both sides to monitor pressure fluctuations in real time in order to detect dynamic leaks.

[0031] The working principle of the device is as follows: After the detection begins, the control unit 11 initiates the overall process. The operator places the valve in the first V-shaped positioning groove 31 and the second V-shaped positioning groove 32. The valve switch engages with the switch engagement module 22. The control unit 11 coordinates with the switch operation module 2 to fix the valve switch and ensures accurate valve positioning through the positioning of the support module 3. Subsequently, the control unit 11 instructs the first blocking unit 41 and the second blocking unit 42 of the blocking execution module 4 to move horizontally along the support module 3 until both ends of the valve are sealed, forming a closed detection chamber.

[0032] When entering static detection mode (valve is closed), control unit 11 controls the gas supply module to supply gas to the gas injection port 431 of the first sealing unit 41 through the pipeline. At this time, the pressure regulating structure 434 of the first sealing unit 41 closes the pressure relief port 433 under the action of injection pressure. Gas enters the valve cavity through the pressure output port 432, and the pressure relief port of the second sealing unit 42 remains open. The dynamic detection module monitors the pressure in real time. If the pressure drops beyond the threshold, leakage is determined. At this time, the leakage at the first end of the valve is detected.

[0033] After the test is completed, the control unit 11 stops supplying air to the first sealing unit 41, and its pressure regulating structure 434 opens the pressure relief port to release the air. Then, it switches to the second sealing unit 42 to inject air for testing. The pressure relief port of the first sealing unit 41 is opened, and the test process is repeated. At this time, the leakage at the second end of the test valve is checked.

[0034] In dynamic detection mode, the control unit 11 instructs the rotation drive module 21 to drive the valve switch to rotate gradually, while coordinating the air supply module to synchronously inject air into the double-sided sealing unit, and the pressure regulating structure 434 closes the pressure relief port 433. The dynamic detection module continuously monitors pressure fluctuations. If an abnormal pressure drop occurs at a certain angle, it is determined that there is a dynamic leak at that location. The control unit 11 records the relevant data and completes the analysis and processing.

[0035] By comparing data from static and dynamic detection modes, it is possible to accurately determine whether a valve is leaking internally or externally. Internal leakage occurs when gas leaks through the valve switch while the valve is closed; external leakage occurs when there is leakage within the valve body or at the switch.

[0036] Specifically, in static detection mode, if the dynamic detection module determines leakage during the gas injection port 431 of the first sealing unit 41, and determines no leakage during the gas injection port 431 of the second sealing unit 42, it means that external leakage occurs at one end of the valve body near the first sealing unit 41, because gas only leaks when injected from the first end, indicating that the leak point is at the valve body or the part where the switch is connected to the valve body at the first end. If the dynamic detection module determines a leak during the gas supply process to the gas injection port 431 of the second sealing unit 42, but determines no leak during the gas supply process to the gas injection port 431 of the first sealing unit 41, it indicates that an external leak has occurred at the end of the valve body near the second sealing unit 42.

[0037] If leakage is detected at both ends of the valve in static detection mode, analysis in conjunction with dynamic detection mode is necessary. If, in dynamic detection mode, the dynamic detection module determines no leakage when the valve is closed, it indicates internal leakage. This is because in static detection, with the valve closed, gas leaks through the switch sealing surface, resulting in leakage detected at both ends, while in dynamic detection, there is no possibility of leakage when the switch is closed. If, in dynamic detection mode, the pressure drop when the valve is closed is consistent with the pressure drop when supplying gas to both ends in static detection, it indicates external leakage, meaning the leak point is in the valve body or at the connection between the switch and the valve body. Furthermore, if, in dynamic detection mode, the pressure fluctuation during gradual valve rotation differs from the pressure drop characteristics in static detection—for example, the fluctuation amplitude is larger and closely related to the switch rotation angle—it indicates external leakage at the switch. This is because the rotation of the switch creates a larger gap or friction at the connection between the switch and the valve body, exacerbating the leakage.

[0038] The control unit 11 performs comprehensive analysis on these static and dynamic detection data, and combines the location, amplitude and related factors of pressure changes to accurately distinguish between internal and external leaks and the specific location of external leaks, providing a precise basis for valve maintenance. Through this data comparison, the device can accurately distinguish between internal and external leaks, greatly improving the comprehensiveness and accuracy of the detection results and effectively solving the problems existing in traditional valve leak detection.

[0039] In this embodiment, the control unit 11 includes a PLC controller and a human-machine interface. The PLC controller has a preset detection program that can automatically receive pressure data from the dynamic detection module and output control commands to realize the coordinated action of each module. The human-machine interface can intuitively display detection parameters, pressure curves and detection results. Operators can also manually input or modify parameters through it, which greatly improves the convenience of operation and the accuracy of parameter control. The gas supply module consists of a gas source generator, a pressure regulating valve, a filter and a solenoid valve group connected in sequence. The gas source generator provides a stable gas source, the pressure regulating valve can accurately adjust the gas pressure, the filter can effectively remove impurities in the gas, and the solenoid valve group is electrically connected to the control unit 11 and can quickly respond to control commands to switch the gas supply to the gas injection interface 431 of the first sealing unit 41 or the second sealing unit 42. During testing, the operator sets parameters such as testing pressure and holding time through the human-machine interface. The PLC controller starts the air supply module according to the preset program. The gas generated by the gas source generator is regulated to the set pressure by the pressure regulating valve, and then purified by the filter before entering the solenoid valve group. The PLC controller controls the solenoid valve group to switch the air path according to the testing mode and supply air to the corresponding sealing unit. At the same time, the PLC controller receives the pressure data of the dynamic detection module in real time, generates a pressure curve on the human-machine interface and judges the test results. If a leak is found, an alarm is triggered in time.

[0040] In this embodiment, the rotation drive module 21 includes a servo motor 22, a reducer 23, a rotation shaft 24, and an angle sensor 25. The servo motor 22 is electrically connected to the control unit 11, and its output shaft is connected to the input end of the reducer 23 via a coupling. The output end of the reducer 23 is fixedly connected to one end of the rotation shaft 24, and the other end of the rotation shaft 24 is fixedly connected to the switch latching module 22. The angle sensor 25 is mounted on the rotation shaft 24 and can detect the rotation angle in real time and feed it back to the control unit 11. When performing dynamic detection, the control unit 11 sends a control command to the servo motor 22. The power output by the servo motor 22 is transmitted to the reducer 23 via the coupling. The reducer 23 converts high speed and low torque into low speed and high torque to drive the rotation shaft 24 to rotate. The rotation shaft 24 then drives the switch latching module 22 and the latched valve switch to rotate synchronously. During this process, the angle sensor 25 monitors the rotation angle of the rotation shaft 24 in real time and feeds the data back to the control unit 11 in real time. The control unit 11 accurately controls the operation of the servo motor 22 according to the feedback angle data to ensure that the valve switch rotates within a preset speed and angle range.

[0041] In this embodiment, the switch latching module 22 includes a circular latching base 221 and a pair of latching strips 222 symmetrically slidably mounted on the circular latching base 221. An adjusting screw 223 is provided through the pair of latching strips 222, and a latching groove 224 for latching the valve switch is formed between the pair of latching strips 222. In use, according to the size of the valve switch, the adjusting screw 223 is rotated to drive the pair of latching strips 222 to slide symmetrically on the circular latching base 221, thereby adjusting the width of the latching groove 224 so that the latching groove 224 matches the size of the valve switch. After the valve switch is placed into the latching groove 224, the adjusting screw 223 is rotated in the opposite direction so that the pair of latching strips 222 tightly clamp the valve switch, achieving a stable latching. When the rotation drive module 21 drives the circular latching base 221 to rotate, the valve switch in the latching groove 224 can rotate synchronously and stably with the latching strips 222.

[0042] In this embodiment, both the first V-shaped positioning groove 31 and the second V-shaped positioning groove 32 include a groove body and an anti-slip pad. The groove body has a V-shaped cross-section, and the anti-slip pad is attached to its inner side wall. The anti-slip pad is made of polyurethane and has anti-slip texture on its surface. During testing, the valve is placed in the first V-shaped positioning groove 31 and the second V-shaped positioning groove 32. The V-shaped structure automatically centers and positions itself through the inclined surfaces on both sides, keeping the valve flange and the sealing unit coaxial. The polyurethane anti-slip pad increases the friction with the valve flange by utilizing its own elasticity and the anti-slip texture on its surface, effectively preventing the valve from sliding during testing due to the thrust of the sealing unit or its own weight.

[0043] In this embodiment, both the first sealing unit 41 and the second sealing unit 42 include a positioning seat 411, a cylinder 412 horizontally mounted on the positioning seat 411, and a sealing disc component 413 fixedly connected to the cylinder 412. The sealing disc component 413 includes a metal disc body 4131 and a sealing gasket 4132. The sealing gasket 4132 has an annular structure and is made of fluororubber or nitrile rubber. It is fixed to the side of the metal disc body 4131 facing the valve by bolts, and the inner diameter of the sealing gasket 4132 is smaller than the outer diameter of the valve inlet. During testing, the control unit 11 controls the cylinder 412 to start. The piston rod of the cylinder 412 pushes the sealing disc component 413 to move horizontally toward the valve flange. The positioning seat 411 provides stable support for the cylinder 412 to ensure accurate movement. When the sealing gasket 4132 contacts the valve flange, the cylinder 412 continuously applies pressure, causing the sealing gasket 4132 to deform due to its own elasticity and tightly cover the sealing surface of the valve flange. Since the inner diameter of the sealing gasket 4132 is smaller than the outer diameter of the valve inlet, it can completely cover the valve inlet and prevent gas leakage. At the same time, the air hole in the center of the metal disc 4131 connects the pressure output interface 432 with the valve cavity, ensuring that the test gas can enter smoothly.

[0044] In this embodiment, the pressure regulating structure 434 includes a solenoid valve installed on the pressure relief port 433. The solenoid valve is electrically connected to the control unit 11. When the control unit 11 controls the gas injection port 431 to inject gas, the solenoid valve closes to seal the pressure relief port 433. When the control unit 11 controls the gas injection port 431 to stop injecting gas, the solenoid valve opens to release the seal on the pressure relief port 433. During the detection process, the control unit 11 sends an electrical signal to the solenoid valve according to the detection mode. When gas injection through the gas injection port 431 is required, the control unit 11 issues a closing command. The valve core of the solenoid valve moves under the action of electromagnetic force, tightly sealing the pressure relief port 433, ensuring that all injected gas enters the valve cavity and maintaining the pressure stability required for detection. When the gas injection is completed and needs to be stopped, the control unit 11 issues an opening command. The valve core of the solenoid valve resets under the action of spring force or its own gravity, the pressure relief port 433 is opened, and the residual gas in the valve cavity and gas path is quickly discharged, preparing for subsequent detection.

[0045] In this embodiment, the dynamic detection module includes a pressure sensor, a data acquisition card, and a data processing unit. The pressure sensor is a high-precision diffused silicon pressure sensor, whose detection end is connected to the pressure output interface 432 of the three-way gas circuit system 43. The output end is connected to the data acquisition card via a signal line. The data acquisition card is electrically connected to the data processing unit. The data processing unit can convert pressure data into a pressure fluctuation curve and compare it with a preset threshold to determine whether there is a leak. It can also record the valve opening and closing angle when a leak occurs. During detection, the pressure sensor senses the pressure change of the pressure output interface 432 in the three-way gas circuit system 43 in real time, converts the pressure signal into an electrical signal, and transmits it to the data acquisition card via a signal line. The data acquisition card performs analog-to-digital conversion and preliminary processing on the electrical signal, and then sends the digitized pressure data to the data processing unit. The data processing unit analyzes the received pressure data, generates an intuitive pressure fluctuation curve, and compares the real-time pressure value with a preset leak judgment threshold. When the pressure fluctuation exceeds the threshold, a leak is determined to exist. At this time, combined with the valve opening and closing angle data fed back by the angle sensor 25, the angle position when the leak occurs is accurately recorded.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A rapid leak detection device for valves, characterized in that, include: The control box (1) integrates a control unit (11) and an air supply module. The control unit (11) is configured to coordinate the timing actions and data processing of each module. The switch operation module (2) includes a switch latching module (22) which is rotatably installed at the center of the top of the control box (1) via a rotary drive module (21). The switch latching module (22) is used to latch the valve switch and can drive the valve switch to rotate under the drive of the rotary drive module (21). The supporting module (3) includes a first V-shaped positioning groove (31) and a second V-shaped positioning groove (32) symmetrically arranged on both sides of the switch snap-fit ​​module (22); The sealing execution module (4) includes a first sealing unit (41) and a second sealing unit (42). The first sealing unit (41) and the second sealing unit (42) are respectively configured to move horizontally along the support module (3) to seal both ends of the valve. The first sealing unit (41) and the second sealing unit (42) have the same structure. They are both equipped with a three-way gas circuit system (43). The three-way gas circuit system (43) has a gas injection interface (431), a pressure output interface (432) and a pressure relief interface (433). The gas injection interface (431) is connected to the gas supply module through a pipeline. The three-way gas circuit system (43) is equipped with a pressure regulating structure (434) for automatically switching the opening and closing state of the pressure relief interface (433) in response to the injection pressure. The dynamic detection module is configured to achieve three detection modes: when the valve is fully closed, it is detected by injecting air through the first sealing unit (41) and the pressure relief port of the second sealing unit (42) is opened; when the valve is fully closed, it is detected by injecting air through the second sealing unit (42) and the pressure relief port of the first sealing unit (41) is opened; and during the gradual rotation of the valve switch, it is detected by injecting air on both sides simultaneously and monitors the pressure fluctuation data in real time.

2. The valve rapid leak detection device according to claim 1, characterized in that, The control unit (11) includes a PLC controller and a human-machine interface. The PLC controller has a preset detection program, which can receive pressure data from the dynamic detection module and output control commands. The human-machine interface is used to display detection parameters, pressure curves and detection results, and can manually input or modify detection parameters. The gas supply module includes a gas source generator, a pressure regulating valve, a filter and a solenoid valve group connected in sequence. The solenoid valve group is electrically connected to the control unit (11) and is used to control the gas supply to the gas injection interface (431) of the first sealing unit (41) or the second sealing unit (42).

3. The valve rapid leak detection device according to claim 1, characterized in that, The rotation drive module (21) includes a servo motor (22), a reducer (23), a rotation shaft (24), and an angle sensor (25). The servo motor (22) is electrically connected to the control unit (11). The output shaft of the servo motor (22) is connected to the input end of the reducer (23) through a coupling. The output end of the reducer (23) is fixedly connected to one end of the rotation shaft (24). The other end of the rotation shaft (24) is fixedly connected to the switch snap-fit ​​module (22). The angle sensor (25) is installed on the rotation shaft (24) and is used to detect the rotation angle in real time and feed it back to the control unit (11).

4. The valve rapid leak detection device according to claim 1, characterized in that, The switch latching module (22) includes a circular latching base (221) and a pair of latching strips (222) symmetrically slidably mounted on the circular latching base (221). An adjusting screw (223) is provided through the pair of latching strips (222), and a latching groove (224) for latching the valve switch is formed between the pair of latching strips (222).

5. The valve rapid leak detection device according to claim 1, characterized in that, The first V-shaped positioning groove (31) and the second V-shaped positioning groove (32) both include a groove body and an anti-slip pad. The groove body has a V-shaped cross section, and the anti-slip pad is pasted on its inner side wall. The anti-slip pad is made of polyurethane and has anti-slip texture on its surface.

6. The valve rapid leak detection device according to claim 1, characterized in that, The first sealing unit (41) and the second sealing unit (42) both include a positioning seat (411), a cylinder (412) horizontally mounted on the positioning seat (411), and a sealing disc component (413) fixedly connected to the cylinder (412).

7. The valve rapid leak detection device according to claim 5, characterized in that, The sealing disc component (413) includes a metal disc body (4131) and a sealing gasket (4132). The sealing gasket (4132) is an annular structure and is made of fluororubber or nitrile rubber. It is fixed to the side of the metal disc body (4131) facing the valve by bolts, and the inner diameter of the sealing gasket (4132) is smaller than the outer diameter of the valve inlet.

8. The valve rapid leak detection device according to claim 1, characterized in that, The pressure regulating structure (434) includes a solenoid valve installed on the pressure relief port (433). The solenoid valve is electrically connected to the control unit (11). When the control unit (11) controls the gas injection port (431) to inject gas, the solenoid valve closes to block the pressure relief port (433). When the control unit (11) controls the gas injection port (431) to stop injecting gas, the solenoid valve opens to release the blockage of the pressure relief port (433).

9. The valve rapid leak detection device according to claim 1, characterized in that, The dynamic detection module includes a pressure sensor, a data acquisition card, and a data processing unit. The pressure sensor is a high-precision diffused silicon pressure sensor. Its detection end is connected to the pressure output interface (432) of the three-way gas circuit system (43). The output end is connected to the data acquisition card through a signal line. The data acquisition card is electrically connected to the data processing unit. The data processing unit can convert the pressure data into a pressure fluctuation curve and compare it with a preset threshold to determine whether there is a leak. It can also record the valve opening and closing angle when a leak occurs.

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