Direct pressure type gas leakage detection method, device and system

Abstract

The invention relates to the technical field of airtightness detection, and discloses a direct pressure type gas leakage detection method, device and system, and the device comprises a mounting base, a plurality of pneumatic control valve core assemblies which are arranged on the base side by side, and a valve body which is integrated with an exhaust mechanism. The mounting base is constructed to be a gas circuit board, a confluence channel is integrated in the mounting base, and the mounting base comprises a test channel and a standard channel which are communicated with a tested product and a standard component respectively. Each valve element assembly is pressed and fixed through a connecting flange, and the working end of each valve element assembly is matched with a channel in the base to control on-off of an air channel. And an exhaust steel valve is integrated in the valve body and is used for quickly exhausting after the test is finished. The sensing end of the differential pressure sensor is connected with the test channel and the standard channel. According to the invention, external pipeline connection and dead volume are reduced through the design of the integrated base, thermal isolation of electric control and a gas circuit is realized through cooperation with the pneumatic control valve, interference of pipeline deformation and temperature change on detection precision is effectively eliminated, and the stability and efficiency of gas tightness detection are improved.

Description

Technical Field

[0001] This invention relates to the field of airtightness testing technology, specifically to a direct-pressure gas leak detection method, equipment, and system. Background Technology

[0002] In industrial production, airtightness testing of sealed workpieces is a crucial process for ensuring product quality, and the differential pressure method is widely used due to its high detection accuracy. Existing direct pressure leak detection equipment typically adopts a distributed layout in its structural design, meaning that control valve groups, differential pressure sensors, and various functional ports are mainly connected by external hoses or rigid pipes.

[0003] This traditional piping connection method has several technical drawbacks. First, the longer external connection pipes increase the internal volume of the gas system, leading to a longer time required for gas filling and stabilization. Furthermore, the hoses are prone to slight radial expansion or creep under high pressure, and this dimensional instability directly introduces pressure fluctuation noise, reducing the sensitivity of the detection system. Second, existing equipment often uses solenoid valves to control the main test circuit. The heat generated by the solenoid valve coil during prolonged operation can easily be conducted through the valve body to the internal test gas. This temperature drift causes gas pressure changes, which in turn interfere with the accuracy of the differential pressure sensor readings. In addition, the complex external piping means a large number of connection joints, which not only increases the potential risk of leakage in the equipment itself and increases maintenance difficulty, but the exhaust path of traditional structures is often limited by the diameter of general-purpose valves, resulting in slow release of high-pressure gas after testing, limiting the improvement of the production line's testing cycle time. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a direct-pressure gas leak detection method, equipment, and system. It solves the problems of existing direct-pressure leak detection equipment, which mostly adopts decentralized pipeline connections and direct control by solenoid valves. These problems include measurement errors caused by pipeline deformation and volume instability, temperature drift interference caused by valve body heating, and numerous potential leak points and low exhaust efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a direct-pressure gas leak detection method, comprising the following steps: S1. Gas supply steps: After being processed by the filter device, the high-pressure gas is divided into two streams. One stream flows to the pressure regulating valve to adjust to the preset pressure and supplies it to the manifold as the test gas source. The other stream flows to the solenoid valve as the drive gas source. S2, Normal Procedure: Control the pneumatic control valve to maintain the normal exhaust state, so that both the test port and the standard port are open to the outside atmosphere, and the system is in a zero-pressure state; S3. Inflation Steps: The solenoid valve activates and drives the inflation control valve to open. The test air source, which has passed through the pressure regulating valve, simultaneously enters the test channel connected to the test object and the standard channel connected to the standard parts. After inflation is completed, the solenoid valve is shut off and the inflation control valve is closed. S4. Balancing Step: After inflation is complete, keep the air passage closed, stop inflation and deflation, and wait for the gas pressure and temperature to stabilize. S5. Detection steps: After balancing, use sensors to detect the pressure change in the test channel of the manifold relative to the standard channel, and calculate the leakage value accordingly. S6. Exhaust procedure: The solenoid valve controls the opening of the exhaust device to release the pressure in the test channel and standard channel to the atmosphere.

[0006] Preferably, in the inflation step, the solenoid valve acts as a pilot valve, using the air pressure of the driving air source to actuate the valve core of the inflation control valve; the test air source is output after being diverted through the flow channel integrated inside the mounting base.

[0007] Preferably, in the normal operation, the pneumatic control valve is configured to be in a normally open mode, and when no driving air pressure is received from the solenoid valve, the test channel and the standard channel are automatically connected to the exhaust port.

[0008] Preferably, in the exhaust step, the solenoid valve drives the exhaust steel valve to open, releasing the system pressure through the exhaust pipe; the detection step uses the differential pressure method for detection.

[0009] A direct-pressure gas leak detection device, comprising: The valve body has an interface inside or on the side for connecting to an external air source and an exhaust pipe; The mounting base is fixedly connected to one side of the valve body, and a gas flow channel is provided inside it. A connecting flange is provided on the upper surface of the mounting base; The valve core assembly is sealed and mounted on the mounting base via the connecting flange, and is used to control the on / off state of the manifold.

[0010] Preferably, the valve core assembly is a pneumatic control valve, and there are multiple valve core assemblies arranged side by side on the mounting base; each valve core assembly is pressed and fixed by a corresponding connecting flange, and the working end of the valve core assembly cooperates with the manifold in the mounting base.

[0011] Preferably, the mounting base is constructed as a pneumatic circuit board, and the manifold includes a test channel connected to the test sample and a standard channel connected to the standard component; the valve core assembly includes an inflation valve core that controls the air intake of the above channels.

[0012] Preferably, the valve body integrates an exhaust valve, which is connected to the manifold in the mounting base and is used to discharge gas during the exhaust step.

[0013] Preferably, the device further includes a differential pressure sensor, which is mounted on the mounting base or valve body, and its sensing end is connected to the test channel and the standard channel gas path, respectively.

[0014] A direct-pressure gas leak detection system includes: The gas source processing module is used to receive high-pressure gas and filter it, dividing the gas into a test gas source for testing and a drive gas source for driving valves, and adjusting the pressure of the test gas source. The test execution module is used to perform inflation, balancing and deflation actions. It uses the valve core assembly to control the test air source to enter the mounting base and vents the air through the venting mechanism inside the valve body. The sensing and detection module includes a differential pressure sensor, which is used to monitor the pressure difference between the test end and the standard end inside the test execution module and output a pressure signal; The control module is electrically connected to the gas source processing module, the test execution module, and the sensing and detection module, respectively. The control module is used to send control signals step by step to adjust the on / off state of each gas path and to calculate the leakage amount based on the pressure signal.

[0015] Working Principle: First, the high-pressure gas input is filtered and regulated by the gas source processing module to form a test gas source with a set pressure and an independent drive gas source. The control module triggers the solenoid valve to perform a pilot action according to the preset detection sequence. The drive gas source drives multiple pneumatic control valve core components and exhaust steel valves located on the mounting base to switch between opening and closing, thereby achieving physical isolation between the electronic control circuit and the main gas circuit. In the specific detection process, the system first maintains normal exhaust to eliminate residual pressure in the circuit. Then, the valve core is opened to synchronously and isobarically pressurize the test sample and the standard reference through the internal flow channel of the mounting base. After the pressurization is stopped, it enters a closed equilibrium stage to eliminate the thermal effect of gas adiabatic compression and workpiece deformation interference. Next, the differential pressure sensor monitors the pressure difference between the test end and the standard end in real time. The differential pressure method effectively offsets the common mode error caused by changes in ambient temperature and atmospheric pressure fluctuations. Finally, the control module calculates the leakage amount and determines the result based on the electrical signal fed back by the sensor, and at the same time drives the exhaust mechanism to release the gas in the system, completing the detection cycle.

[0016] This invention provides a direct-pressure gas leak detection method, equipment, and system. It has the following beneficial effects: 1. This invention integrates the manifold channel inside the mounting base, replacing the traditional external hose connection method, which significantly reduces the number of connection joints in the gas circuit system. This integrated structure reduces the risk of external leakage caused by loose or aging joints and improves the sealing reliability of the equipment. On the other hand, it reduces the internal volume of the gas circuit, making gas pressure transmission faster and reducing the interference of hose deformation on pressure detection.

[0017] 2. This invention uses a pneumatic control valve as the main control element, in conjunction with a solenoid valve for pilot drive, to achieve physical isolation between the electrical control circuit and the high-pressure test gas circuit; it avoids the heat generated by the solenoid valve coil working for a long time being directly transferred to the test gas, thus preventing pressure fluctuation errors caused by temperature rise; at the same time, the air-always-open configuration allows the equipment to automatically switch to exhaust mode when the power is off or the gas source fails, avoiding high-pressure gas retention and ensuring operational safety.

[0018] 3. This invention utilizes a differential pressure sensor to simultaneously connect the test channel and the standard channel, constructing a symmetrical differential pressure detection loop. This structure effectively offsets the common-mode error caused by changes in ambient temperature and fluctuations in the gas source using the differential pressure method, improving the detection accuracy for minute leaks. In addition, the high-flow exhaust steel valve integrated in the valve body can withstand the high-frequency scouring of high-pressure airflow, quickly releasing system pressure after the test, shortening the single detection cycle, and improving detection efficiency. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is a rear view of the present invention.

[0020] The components are: 1. Valve body; 2. Mounting base; 3. Connecting flange; 4. Valve core assembly. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0022] Please see the appendix Figure 1 Appendix Figure 2 This invention provides a direct-pressure gas leak detection method, comprising the following steps: S1. Gas supply steps: After being processed by the filter device, the high-pressure gas is divided into two streams. One stream flows to the pressure regulating valve to adjust to the preset pressure and supplies it to the manifold as the test gas source. The other stream flows to the solenoid valve as the drive gas source. S2, Normal Procedure: Control the pneumatic control valve to maintain the normal exhaust state, so that both the test port and the standard port are open to the outside atmosphere, and the system is in a zero-pressure state; S3. Inflation Steps: The solenoid valve activates and drives the inflation control valve to open. The test air source, which has passed through the pressure regulating valve, simultaneously enters the test channel connected to the test object and the standard channel connected to the standard parts. After inflation is completed, the solenoid valve is shut off and the inflation control valve is closed. S4. Balancing Step: After inflation is complete, keep the air passage closed, stop inflation and deflation, and wait for the gas pressure and temperature to stabilize. S5. Detection steps: After balancing, use sensors to detect the pressure change in the test channel of the manifold relative to the standard channel, and calculate the leakage value accordingly. S6. Exhaust procedure: The solenoid valve controls the opening of the exhaust device to release the pressure in the test channel and standard channel to the atmosphere.

[0023] A filtration device is installed to remove moisture, oil, and solid particles from the high-pressure gas, preventing damage to the precision valve core due to impurities or corrosion, extending equipment lifespan, and ensuring gas purity. A pressure regulating valve adjusts fluctuating factory gas pressure to a constant test pressure, eliminating the impact of gas fluctuations on testing accuracy. A solenoid valve, in conjunction with the driving gas source, performs pilot control, driving high-pressure or high-flow gas path action with a small electrical signal, achieving water-electricity separation control and improving system safety. A pneumatic control valve opens the exhaust circuit when not in operation, ensuring no residual pressure in the test circuit before the test cycle begins, preventing test reference drift caused by residual pressure. Test and standard ports are used to connect the workpiece under test and the standard reference piece respectively, constructing a symmetrical differential pressure test circuit. A charging pneumatic control valve, in conjunction with the flow channel within the mounting base 2, provides a large flow of gas, shortening the charging time for large-volume workpieces and improving accuracy. To improve detection efficiency, the test and standard channels are designed to synchronously introduce gases of the same source and pressure into the tested and standard ends, providing consistent initial pressure conditions for subsequent differential pressure comparisons. A closed gas path isolates the external gas source from the test circuit, eliminating interference from pressure fluctuations at the gas supply end. This step eliminates the thermal effects of adiabatic compression during gas filling and the elastic deformation of the workpiece under pressure, thus stabilizing the gas state and reducing false pressure drops. Sensors are used to detect minute pressure differences between the test and standard ends, offsetting common-mode errors caused by ambient temperature changes and atmospheric pressure fluctuations, improving the sensitivity to detect minute leaks. A manifold integrates the gas path channels and sensor interfaces, reducing the dead volume of the gas path and improving the system's response speed. An exhaust device quickly releases high-pressure gas from the circuit after testing, allowing for safe disassembly of the workpiece and preparation for the next test. The solenoid valve used in this application is a common pneumatic control element used to receive control signals and switch the gas path on / off.

[0024] Please see the appendix Figure 1 Appendix Figure 2 During the inflation process, the solenoid valve acts as a pilot valve, using the air pressure from the driving air source to actuate the valve core of the inflation control valve; the test air source is output after being diverted through the flow channel integrated inside the mounting base 2.

[0025] The solenoid valve receives electrical signals from the control system and controls the opening and closing of the drive air path, thus enabling the control of high-pressure test gas with low-pressure drive gas. This avoids interference from the temperature of the test gas caused by the coil heating required for direct control of high-pressure gas. The valve core of the inflation control valve moves axially in conjunction with the air pressure of the drive air source, thereby connecting the air source and the test circuit and achieving a high-flow-rate rapid inflation effect. The mounting base 2 supports the valve body assembly and houses the internal air path, reducing the number of external pipeline connections, lowering the risk of leakage due to loose joints, and improving the integration and sealing of the equipment. The internally integrated flow channel evenly and synchronously distributes the single-input test air source to the test end and the standard end, ensuring the synchronization of pressure establishment between the test circuit and the standard circuit and reducing detection errors caused by uneven inflation.

[0026] Please see the appendix Figure 1 Appendix Figure 2 In normal operation, the pneumatic control valve is configured to be in normally open mode. When no driving air pressure is received from the solenoid valve, the test channel and the standard channel are automatically connected to the exhaust port.

[0027] The pneumatically controlled valve is designed to remain open when there is no external drive signal, thanks to an internal spring reset. This ensures passive safety of the equipment during standby or power failure, preventing high-pressure gas from accumulating in the cavity. The solenoid valve blocks the path of the drive gas source to the pneumatically controlled valve, eliminating the thrust acting on the valve core and resetting it. The test channel and standard channel work together with the exhaust port to conduct fluid, releasing residual pressure in the detection circuit and standard circuit to the atmosphere. This effectively removes residue from the previous test and prevents sensor zero-point drift.

[0028] Please see the appendix Figure 1 Appendix Figure 2 In the exhaust step, the solenoid valve drives the exhaust steel valve to open, releasing the system pressure through the exhaust pipe; the detection step uses the differential pressure method for detection.

[0029] The exhaust valve, in conjunction with the high-flow-rate channel inside valve body 1, provides a low-resistance venting path, achieving the effect of venting high-pressure gas in a very short time and improving the detection cycle. The exhaust valve is made of stainless steel to withstand the high-frequency scouring and wear of high-pressure airflow. The exhaust pipe is used to guide the accumulated waste gas inside the equipment to the external environment or a silencer, thereby avoiding noise pollution and safety hazards to operators caused by direct injection of high-pressure gas and optimizing the working environment. The differential pressure sensor used in the differential pressure method is used to compare the small pressure difference between the test end and the standard end in real time, thereby effectively offsetting the common-mode error caused by ambient temperature fluctuations and adiabatic compression, improving the sensitivity and accuracy of detecting small leaks.

[0030] Please see the appendix Figure 1 Appendix Figure 2 A direct-pressure gas leak detection device, comprising: Valve body 1, with an interface for connecting an external air source and an exhaust pipe provided inside or on the side; Mounting base 2 is fixedly connected to one side of valve body 1, and has a manifold for gas flow inside. Connecting flange 3 is located on the upper surface of mounting base 2; The valve core assembly 4 is sealed and installed on the mounting base 2 via the connecting flange 3, and is used to control the opening and closing of the manifold.

[0031] The valve body 1 serves as the main support for the equipment and integrates the pilot control air circuit, thereby providing mounting positions and drive air sources for various pneumatic components. This enables modular assembly of the equipment, facilitating maintenance and repair. The interface is used to connect to the factory's high-pressure air source pipeline and exhaust gas pipeline, ensuring stable input of the test medium and directional discharge of exhaust gas, avoiding noise pollution caused by direct exhaust. The mounting base 2 supports the valve core assembly and replaces complex external connection pipelines, thereby eliminating potential joint leakage points in traditional pipeline connections and improving the overall sealing and stability of the testing system. The manifold channel is used to evenly distribute the single-entry test gas to each test port inside the base, thereby ensuring that the gas leading to the test sample and the standard sample has consistent flow resistance characteristics and reducing measurement errors. The connecting flange 3 is used to evenly press the base of the valve core assembly 4 onto the mounting base, thereby providing reliable end face sealing force and preventing high-pressure gas from leaking out from the mounting joint surface of the valve body 1. The valve core assembly 4, in conjunction with the valve seat structure in the mounting base 2, performs axial lifting and lowering movement, thereby changing the on / off state of the flow channel and achieving the effect of precisely controlling the inflation, cut-off, and exhaust according to the test sequence.

[0032] Please see the appendix Figure 1 Appendix Figure 2 The valve core assembly 4 is a pneumatic control valve, and there are multiple valve core assemblies arranged side by side on the mounting base 2. Each valve core assembly 4 is pressed and fixed by a corresponding connecting flange 3, and the working end of the valve core assembly 4 is engaged with the manifold in the mounting base 2.

[0033] The valve core assembly 4 is used to independently control the on / off state of the test circuit and the standard circuit, thereby achieving synchronous inflation and precise shut-off of the dual-channel gas path, meeting the process requirements of differential pressure detection. The side-by-side arrangement shortens the physical distance between the gas paths, thereby reducing the volume of the internal flow channel and improving the system's response speed to pressure changes. The connecting flange 3 applies uniform axial pressure to the valve body 1 base, thereby compressing the seal to fill the mating gap, preventing high-pressure gas from leaking out of the connection gap and ensuring airtightness. The working end of the valve core assembly 4 cooperates with the valve port structure in the mounting base 2 to perform a pressure sealing movement, thereby achieving the effect of cutting off the airflow and ensuring the absolute closure of the gas path during the balancing and detection stages, preventing misjudgments caused by internal leakage of the valve.

[0034] Please see the appendix Figure 1 Appendix Figure 2 The mounting base 2 is constructed as a pneumatic circuit board, and the manifold includes a test channel connected to the test sample and a standard channel connected to the standard component; the valve core assembly 4 includes an inflation valve core that controls the air intake of the above channels.

[0035] The mounting base 2 integrates complex piping into a single metal block, eliminating the risk of volume changes and leaks that may occur with external hose connections and improving the volume stability of the testing system. The test channel and standard channel are used to independently transmit gas media to the workpiece under test and the standard container, respectively, thereby constructing a symmetrical differential pressure pneumatic circuit inside the equipment and providing an accurate sampling interface for the differential pressure sensor. The inflation valve core works in conjunction with the valve seat in the mounting base 2 to perform a sealing cut-off movement, thereby quickly cutting off the gas source after inflation, achieving the effect of closing the test circuit for subsequent balancing and testing.

[0036] Please see the appendix Figure 1 Appendix Figure 2 The valve body 1 integrates an exhaust steel valve, which is connected to the manifold in the mounting base 2 and is used to discharge gas during the exhaust step.

[0037] The exhaust valve is made of stainless steel, which is designed to withstand the scouring and wear of high-pressure airflow during high-frequency exhaust operations, ensuring reliable sealing. The exhaust valve works in conjunction with the manifold in the mounting base 2 to open and conduct, thereby connecting the high-pressure test circuit with the outside atmosphere and establishing a low-flow-resistance pressure relief path. The gas is discharged to release the pressure energy accumulated inside the workpiece and pipeline, thereby restoring the workpiece to normal pressure for safe disassembly and eliminating the interference of residual pressure on the next testing cycle.

[0038] Please see the appendix Figure 1 Appendix Figure 2The device also includes a differential pressure sensor, which is mounted on the mounting base 2 or the valve body 1, and its sensing end is connected to the test channel and the standard channel air path, respectively.

[0039] The differential pressure sensor is used to accurately measure the pressure difference between the measured end and the reference end, thereby filtering out common-mode interference caused by gas source fluctuations or ambient temperature changes, improving the detection sensitivity of minute leaks. The installation position is designed to shorten the pressure tapping path, thereby reducing the dead volume in the connecting pipeline and reducing measurement errors and signal hysteresis caused by hose deformation or excessive length. The sensing end works with the test channel and standard channel to sample and connect, thereby establishing a symmetrical differential pressure measurement loop inside the sensor, achieving the effect of real-time capture and feedback of pressure attenuation signals caused by leakage.

[0040] Please see the appendix Figure 1 Appendix Figure 2 A direct-pressure gas leak detection system, comprising: The gas source processing module is used to receive high-pressure gas and filter it, separating the gas into test gas source for testing and drive gas source for driving valves, and adjusting the pressure of the test gas source. The test execution module is used to perform inflation, balancing and deflation actions. It uses the valve core assembly 4 to control the test air source to enter the mounting base 2 and to vent through the venting mechanism in the valve body 1. The sensing and detection module includes a differential pressure sensor, which is used to monitor the pressure difference between the test end and the standard end inside the test execution module and output a pressure signal; The control module is electrically connected to the gas source processing module, the test execution module, and the sensor detection module, respectively. The control module is used to send control signals step by step to adjust the on / off state of each gas path and to calculate the leakage amount based on the pressure signal.

[0041] The filter assembly removes moisture, oil, and solid particles from the compressed air, preventing impurities from entering the precision air circuit and causing valve jamming or sensor damage, thus extending the service life of pneumatic components. The pressure regulating assembly reduces and stabilizes fluctuating factory air supply pressure, ensuring a constant output test air pressure and eliminating the interference of air pressure fluctuations on test result stability. The test execution module, in conjunction with the control timing, switches the air circuit, completing a full physical cycle from pressurization to depressurization, achieving the effect of airtightness testing on the workpiece. The valve core assembly 4 physically isolates or connects the air source and the test chamber, providing a high-flow channel during the inflation phase and ensuring absolute sealing of the circuit during the balancing and testing phases, preventing misjudgments due to internal air leakage. The exhaust mechanism, in conjunction with the exhaust pipe, opens and depressurizes, rapidly diverting the high-pressure exhaust gas after the test to the outside, achieving rapid... The system rapidly reduces pressure to facilitate workpiece replacement; a differential pressure sensor detects minute pressure drops at the test end relative to the standard end, converting invisible physical quantities of leakage into quantifiable electrical signals, thus improving the detection system's ability to capture minute leaks; pressure signal output transmits analog or digital quantities to the backend in real time, providing the raw data foundation for subsequent data analysis and result determination; electrical connections enable signal pathways for command issuance and data feedback, constructing a closed-loop control system and enabling collaborative work between hardware modules; control signals drive solenoid valves, indirectly controlling the opening and closing of pneumatic valves, achieving a safe control logic for water-electricity separation; and a calculation algorithm converts received differential pressure values ​​and test time parameters to derive a standard leakage rate, automatically comparing it with a preset threshold to achieve automated product qualification.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A direct-pressure gas leak detection method, characterized in that, Includes the following steps: S1. Gas supply steps: After being processed by the filter device, the high-pressure gas is divided into two streams. One stream flows to the pressure regulating valve to adjust to the preset pressure and supplies it to the manifold as the test gas source. The other stream flows to the solenoid valve as the drive gas source. S2, Normal Procedure: Control the pneumatic control valve to maintain the normal exhaust state, so that both the test port and the standard port are open to the outside atmosphere, and the system is in a zero-pressure state; S3. Inflation Steps: The solenoid valve activates and drives the inflation control valve to open. The test air source, which has passed through the pressure regulating valve, simultaneously enters the test channel connected to the test object and the standard channel connected to the standard parts. After inflation is completed, the solenoid valve is shut off and the inflation control valve is closed. S4. Balancing Step: After inflation is complete, keep the air passage closed, stop inflation and deflation, and wait for the gas pressure and temperature to stabilize. S5. Detection steps: After balancing, use sensors to detect the pressure change in the test channel of the manifold relative to the standard channel, and calculate the leakage value accordingly. S6. Exhaust procedure: The solenoid valve controls the opening of the exhaust device to release the pressure in the test channel and standard channel to the atmosphere.

2. The direct-pressure gas leak detection method according to claim 1, characterized in that, In the inflation step, the solenoid valve acts as a pilot valve, using the air pressure of the driving air source to drive the valve core of the inflation control valve to move; the test air source is output after being diverted through the flow channel integrated inside the mounting base (2).

3. The direct-pressure gas leak detection method according to claim 1, characterized in that, In the normal operation, the pneumatic control valve is configured to be in normally open mode. When no driving air pressure is received from the solenoid valve, the test channel and the standard channel are automatically connected to the exhaust port.

4. The direct-pressure gas leak detection method according to claim 1, characterized in that, In the exhaust step, the solenoid valve drives the exhaust steel valve to open, releasing the system pressure through the exhaust pipe; the detection step uses the differential pressure method for detection.

5. A direct-pressure gas leak detection device, comprising a direct-pressure gas leak detection method according to any one of claims 1-4, characterized in that, include: The valve body (1) has an interface inside or on the side for connecting an external air source and an exhaust pipe; The mounting base (2) is fixedly connected to one side of the valve body (1), and a gas flow channel is provided inside it; A connecting flange (3) is disposed on the upper surface of the mounting base (2); The valve core assembly (4) is sealed and installed on the mounting base (2) through the connecting flange (3) for controlling the opening and closing of the manifold.

6. The direct-pressure gas leak detection device according to claim 5, characterized in that, The valve core assembly (4) is a pneumatic control valve, and there are multiple valve core assemblies arranged side by side on the mounting base (2). Each valve core assembly (4) is pressed and fixed by a corresponding connecting flange (3), and the working end of the valve core assembly (4) is engaged with the manifold in the mounting base (2).

7. The direct-pressure gas leak detection device according to claim 5, characterized in that, The mounting base (2) is constructed as a gas circuit board, and the manifold includes a test channel connected to the test sample and a standard channel connected to the standard component; the valve core assembly (4) includes an inflation valve core that controls the air intake of the above channels.

8. A direct-pressure gas leak detection device according to claim 5, characterized in that, The valve body (1) integrates an exhaust steel valve, which is connected to the manifold in the mounting base (2) and is used to discharge gas during the exhaust step.

9. A direct-pressure gas leak detection device according to claim 5, characterized in that, The device also includes a differential pressure sensor, which is mounted on the mounting base (2) or valve body (1), and its sensing end is connected to the test channel and standard channel gas path respectively.

10. A direct-pressure gas leak detection system, comprising a direct-pressure gas leak detection device according to any one of claims 5-9, characterized in that, include: The gas source processing module is used to receive high-pressure gas and filter it, dividing the gas into a test gas source for testing and a drive gas source for driving valves, and adjusting the pressure of the test gas source. The test execution module is used to perform inflation, balancing and deflation actions. It uses the valve core assembly (4) to control the test air source to enter the mounting base (2) and to vent through the venting mechanism in the valve body (1). The sensing and detection module includes a differential pressure sensor, which is used to monitor the pressure difference between the test end and the standard end inside the test execution module and output a pressure signal; The control module is electrically connected to the gas source processing module, the test execution module, and the sensing and detection module, respectively. The control module is used to send control signals step by step to adjust the on / off state of each gas path and to calculate the leakage amount based on the pressure signal.

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