123 results about "Pipeline.air" patented technology

The invention relates to the technical field of air leakage big data analysis, in particular to a compressed air pipeline air leakage intelligent analysis system and method based on LLM. A plurality of monitoring nodes in a compressed air pipeline are analyzed, and data normal range parameters and adaptive acquisition frequency are preset for each node in the pipeline operation stage; the clear definition standard avoids misjudgment of original data due to fuzzy threshold values, then data noise is effectively reduced by analyzing the data synchronization degree of each monitoring node and intelligently repairing the problems of missing, deviation and the like, the repaired data better fits the actual operation state of the compressed air pipeline, the missed detection and mispositioning risks are reduced, and the reliability of the compressed air pipeline is improved. And finally fusing the data of the gas leakage node and the adjacent node to supplement multi-dimensional information, and optimizing the fusion data quality. The LLM model depends on high-quality fusion data, deep analysis is carried out in combination with compressed air pipeline multi-monitoring-node correlation characteristics and historical experience, deviation caused by data defects is reduced, and the accuracy of an intelligent air leakage analysis result is greatly improved.

The utility model discloses a pressure pipeline air tightness detection device, which belongs to the technical field of pipeline air tightness detection devices and comprises a supporting rack, a pressurization driving mechanism, an air expansion plugging structure, a limiting support, a locking mechanism, a detection clamp and a sensor actuating mechanism. The pressurization driving mechanism is arranged on one side face of the supporting rack, the air expansion plugging structure is arranged on the supporting rack, and the pressurization driving mechanism is in driving connection with the air expansion plugging structure; the limiting support and the locking mechanism are arranged adjacently, and the limiting support is arranged between the detection clamp and the air expansion plugging structure. The detection clamp is arranged on the other side of the supporting rack relative to the pressurization driving mechanism, and the sensor action mechanism is arranged adjacent to the detection clamp and movably connected with the detection clamp. The air tightness detection device for the pressure pipeline solves the technical problem of how to carry out air tightness detection on a single-section gas pipeline.

The utility model relates to the field of detection devices, in particular to a liquid immersion type pressure pipeline air tightness detection device, which comprises a liquid immersion box, a corrugated main pipe, a lifting frame and an air tightness immersion mounting pipe, through a separation area formed by the wave impingement plate and the blocking lines, in combination with a built-in infrared sensor, bubble dynamic states are monitored in real time, subjective errors of naked eye observation are eliminated, tiny leakage is effectively recognized, the lifting frame is driven by the air cylinder to ascend and descend, the water pressure in the liquid immersion box can be accurately adjusted, and pressure impacts of different working conditions on a pipeline can be simulated. Meanwhile, the wave impingement plate and the stabilizing plate cooperate to reduce water flow fluctuation interference, the airtight soaking mounting pipe is subjected to steering adjustment and air bag floating ball self-adaptive positioning, rapid adaptation of different pipe diameters and mounting angles is supported, the operation complexity is reduced, an airtight sleeve and a branch sleeve form a multi-layer sealing structure, and the service life is prolonged. The pressurizing box is combined to control the air pump to dynamically compensate air pressure, misjudgment or equipment damage caused by sudden pressure change in the detection process is prevented, and the overall detection effect is improved.

The invention discloses a pipeline air charging device and method, and relates to the technical field of vehicle detection and maintenance, the pipeline air charging device comprises a supporting seat, a positioning gland and a transition joint, the supporting seat is of a hook-shaped structure, and the supporting seat is provided with a clamping groove used for clamping a car coupler main blast pipe fixing seat; one end of the supporting seat is connected with a positioning gland, a transition connector is installed on the side, away from the supporting seat, of the positioning gland and used for being connected with an air charging pipeline, and the other side of the positioning gland is used for being in butt joint with a vehicle body air pipe. The supporting seat is designed according to the outer contour of the coupler, accurate, firm and reliable positioning is guaranteed, and the air charging efficiency can be improved.

The invention provides a fuel cell system and a humidification control method thereof. The fuel cell system comprises an electric pile, a humidifier and an air pipeline, wherein the air pipeline comprises a dry air inlet header pipe, an air pile inlet pipeline, a dry air bypass, an air return pipeline, a backpressure pipeline and a bypass pipeline; one end of the air return pipeline is connected with an air outlet of the galvanic pile, and the other end is connected with a return air inlet of the humidifier; one end of the backpressure pipeline is connected with a backflow air outlet of the humidifier, and the other end is communicated with external atmosphere; two ends of the bypass pipeline are connected with an air return pipeline and a backpressure pipeline; a first throttle valve is arranged in the dry air inlet main pipe; a second throttle valve is arranged in the dry air bypass; a third throttle valve is arranged in the air return pipeline; and a fourth throttle valve is arranged in the bypass pipeline. In this way, when humidification is needed, the opening degree of the first throttle valve and the third throttle valve can be increased, the opening degree of the second throttle valve and the fourth throttle valve can be reduced, the water supplementing requirement of the humidifier is lowered, and the problems in the prior art are solved.

The invention belongs to the technical field of forklift hydraulic diagnosis optimization, and provides a fault self-diagnosis and optimization method for a forklift hydraulic system, which is used for monitoring the air pressure of an oil suction pipeline in the forklift hydraulic system, judging whether the oil suction pipeline leaks air or not, directly determining whether a fault occurs at the oil suction pipeline or not, and improving the working efficiency of the forklift hydraulic system. The content of bubbles in oil can be reduced, the pressure and flow transmission efficiency of a hydraulic system can be improved, when it is judged that an oil suction pipeline leaks air, under the scene that the forklift steers at a small angle continuously between narrow goods shelves, the steering lagging duration and the bubble compression duration of each time of small-angle steering are obtained respectively, and the steering lagging duration and the bubble compression duration of each time of small-angle steering are obtained. The correlation degree between the steering lag time and the oil bubble compression time is evaluated, the influence mechanism of air leakage on a steering system is known more deeply, different types of faults can be distinguished, the main reason of steering lag caused by oil bubble compression can be quickly positioned, and the method and the device can be used for adjusting parameters such as the sending opportunity and the frequency of a steering instruction in the later period. And data support is provided.

The utility model relates to the technical field of pipeline air volume measuring devices, and provides an environment-friendly equipment pipeline air volume measuring device which comprises two mounting plates, a plurality of guide sliding rods fixedly arranged on the opposite faces of the two mounting plates, an adjusting plate connected to the outer surfaces of the guide sliding rods in a sliding mode, a first motor output shaft driving a driving lead screw to rotate, and a second motor output shaft driving the driving lead screw to rotate. An adjusting plate is driven to move between the mounting plates on the two sides along a guide sliding rod, a plurality of connecting plates are driven to rotate on the adjusting plate, the connecting plates drive a plurality of rotating plates to rotate around a first rotating shaft, and then the distance, relative to the axes of the two mounting plates, of a plurality of bottom plates is adjusted; the device can be correspondingly adjusted according to the inner diameter of the environment-friendly equipment pipeline with the actual air volume to be measured, air in the environment-friendly equipment pipeline blows the fan blades in the ventilation pipes, the device measures the air speed and calculates the air volume by combining the sectional area of the pipeline at the measurement position, and the data processing display screen displays the air volume measurement and calculation result of the device.

The utility model relates to the technical field of fan pipelines, and discloses a fan pipeline air leakage prevention device which comprises a fan body, and the surface side of the fan body is fixedly connected with a first connecting pipe. The first connecting frame is connected with the second connecting frame, the sealing plate on the second connecting frame is inserted into the sealing groove in the first connecting frame, the fixing bolt is inserted into the connecting groove of the first connecting frame and the second connecting frame, a user pulls the sliding plate to move, and the sliding plate drives the sliding block to move; when the sliding plate moves to the position where the fixing plate and the fixing bolt are connected, the rotating plate is rotated through the rotating seat, the fixing plate on the rotating plate is inserted into the fixing groove in the fixing bolt, then the spring is contracted due to pulling, and the spring drives the fixing plate to pull the fixing bolt; and the overall sealing performance is guaranteed through the sealing plate and the sealing groove, and then rapid mounting and dismounting of the pipeline are guaranteed through the fixing plate and the spring.

The utility model relates to a composite device for preventing air leakage and molten steel backflow of a steel ladle pipeline, which is characterized by comprising a steel ladle air brick, a metal hose, a pressure container, a one-way valve, an air inlet pipeline and a quick connector, the number of the metal hoses is two, one end of each metal hose is connected with one independent steel ladle air brick, and the other end of each metal hose is connected to an air outlet of the pressure container. The one-way valve is arranged on an air inlet pipeline of the pressure container in series, and the air flow direction of the one-way valve is in one-way conduction from an external air source to a steel ladle air brick. The air inlet end of the air inlet pipeline is communicated with an external air source through a quick connector. According to the composite device for preventing air leakage and molten steel backflow of the steel ladle pipeline, through unique design and component cooperation, air leakage and molten steel backflow are effectively prevented, production safety and stability are guaranteed, and the maintenance cost is reduced.

The utility model provides a metering and calibrating device for a hydrogen adding machine for an automobile, which comprises a detection box body provided with a fixed pipeline, and a detection module is arranged on the fixed pipeline; a first connecting position and a second connecting position which are connected with one end of the fixed pipeline are respectively arranged on the detection box body; the first connecting position is used for inserting the hydrogen adding machine; and the connecting air gun is connected with the other end of the fixed pipeline and is connected with a hydrogen filling port of the automobile. According to the metering and calibrating equipment of the hydrogen adding machine for the automobile, the second connecting position is connected with the shielding gas supply unit to clean air in a pipeline before the hydrogen adding machine is inserted, so that potential safety hazards caused by mixing of hydrogen and air are avoided, and the safety in the metering and calibrating process is improved; meanwhile, the clean air ensures the purity of gas components in the pipeline and prevents the air from interfering with hydrogen metering, so that the accuracy of metrological verification of the hydrogen adding machine is remarkably improved; the connecting air gun can be directly connected with a hydrogen filling port of an automobile without repeated disassembly.

The invention relates to the technical field of fluid control, in particular to an all-working-condition water supply and drainage pipeline air valve, and discloses an air valve named as an all-working-condition water supply and drainage pipeline air valve. The air valve aims at solving the problems of performance contradiction and integration complexity of an existing air valve under all working conditions (large-flow intake and exhaust, trace exhaust, low-pressure self-sealing and water hammer protection). The exhaust valve is characterized by comprising a valve body, a buoy, an arc-shaped valve plate, a valve cover, a pedestal, a sealing ring and an exhaust speed limiting plate. The sealing ring is matched with the pedestal to realize low-pressure self-reinforced sealing; the arc-shaped valve plate and the valve body form a large-flow exhaust channel, a trace exhaust channel is arranged in an exhaust rod, and the arc-shaped valve plate and the valve body are independent; the exhaust speed limiting plate is driven by airflow to limit exhaust during high-speed exhaust. According to the scheme, the safety, reliability and efficiency of the system can be improved, and large-flow intake and exhaust, low-pressure precise sealing and water hammer prevention are considered.

The present invention belongs to the technical field of aircraft environmental control systems and relates to a pipeline-type air atomizing nozzle; comprising a nozzle body, a nozzle core, and a nozzle nozzle; the nozzle body is sealed and installed with the nozzle core, and the nozzle body is sealed and installed with the nozzle nozzle; the nozzle body is composed of an air supply port, a gas buffer chamber, and an atomizing chamber; the air supply port is the inlet of the gas medium; the gas buffer chamber serves to stabilize the air pressure and is used to transport the gas medium; the atomizing chamber is a chamber in which the liquid medium and the gas medium are atomized inside the air atomizing nozzle; the nozzle core is cylindrical and consists of a liquid supply port, a liquid spray hole, a gas spray hole, and a gas-liquid atomizing chamber. The pipeline-type air atomizing nozzle provided by the present invention reduces the contact between the atomizing medium and the inner wall of the pipeline, and the atomizing medium and the fluid medium inside the pipeline can be fully mixed and reacted in a confined space, thereby greatly improving the control quality of parameters such as temperature and humidity of the fluid medium in the pipeline.

The utility model discloses an internal and external direct injection combustor structure which comprises a central air inlet horn furnace end, an external air inlet seat and an external direct injection pipeline. The outer gas inlet seat is arranged at the top of the central gas inlet horn furnace head and is fixedly connected with the central gas inlet horn furnace head, a central gas outlet hole is formed in the top of the central gas inlet horn furnace head, a central gas outlet pipeline matched with the central gas outlet hole is arranged in the middle of the outer gas inlet seat, and gas enters from the central gas inlet horn furnace head and is directly exhausted through the central gas outlet pipeline. An outer air inlet pipeline is arranged on the outer side of the outer air inlet seat, an outer air inlet pipeline air inlet head is arranged on the outer side face of the outer air inlet pipeline, a plurality of outer air inlet pipeline air outlet heads are arranged on the top of the outer air inlet pipeline, and the bottom of the outer direct injection pipeline is arranged on the outer air inlet pipeline air outlet heads. Fuel gas enters from the gas inlet head of the outer gas inlet pipeline, passes through the gas outlet head of the outer gas inlet pipeline and then is exhausted from the outer direct injection pipeline.

The application discloses a fermentation mechanism, which comprises a tank body, a cavity is arranged in the tank body, an air distributor is fixedly arranged at the bottom of the cavity, a pipeline for conveying air is connected between the air distributor and the tank body, the air distributor comprises a top plate, side plates are connected to the two sides of the top plate and connected with the bottom of the tank body, through holes are formed in the side plates and the top plate, the diameter of the through hole of the top plate is larger than that of the through hole of the side plate, the top plate, the side plates and the bottom of the tank body jointly enclose an air shunting cavity, a distribution plate is arranged in the air shunting cavity, a shunting hole is formed in the distribution plate, a rotating device is connected to the distribution plate, and the distribution plate rotates relative to the top plate under the action of the rotating device to adjust the coincidence degree of the shunting hole and the through hole. The distribution plate is driven to rotate in the air distributor through the rotating device, the coincidence degree of the shunting hole on the distribution plate and the through hole on the top plate is adjusted, the main flow direction of air is changed, and different oxygen requirements in the tank in the early fermentation stage and the middle and late fermentation stages are met.

The application discloses an energy-saving type vacuum drainage pipeline air supplementing and cleaning device, which comprises a vacuum valve and a negative pressure controller, the negative pressure controller comprises a vacuum output port and a first vacuum pipeline interface, the vacuum valve comprises a vacuum input port and a second vacuum pipeline interface, the first and second vacuum pipeline interfaces are connected with a vacuum pipeline, the vacuum output port of the negative pressure controller is communicated with the vacuum input port of the vacuum valve, and the vacuum negative pressure output by the negative pressure controller can control the opening and closing of the vacuum valve. The energy-saving type vacuum drainage pipeline air supplementing and cleaning device is combined with the vacuum valve and the negative pressure controller, can accurately and effectively obtain a vacuum negative pressure value in a suitable range to supplement the atmosphere to the vacuum pipeline for pipeline cleaning, and cannot cause the situation that the vacuum station continuously extracts the gas in the vacuum pipeline to generate high energy consumption when the system is restarted or starts to die, so that the technical effects of preventing misoperation and saving energy are achieved.

The utility model relates to the technical field of gas heaters, and discloses a multi-pipeline hot-air blower, which comprises a gas input component, an air inlet interface for inputting gas to be heated and a first sealing cover plate, the air inlet interface is arranged on one side of the first sealing cover plate, and the first sealing cover plate is arranged on the other side of the first sealing cover plate. The first sealing cover plate is provided with a plurality of air inlet holes communicating with the air inlet connector. The gas heating assembly comprises heating pipes and conducting rings, the number of the heating pipes is the same as that of the gas inlet holes, the conducting rings are arranged on the heating pipes in a sleeving mode, the conducting rings are used for being communicated with a power source to heat the heating pipes and further heat to-be-heated gas in the heating pipes, plastic parts are arranged at the two ends of each heating pipe respectively, and the plastic parts are connected with the gas inlet holes in a sealed mode; the gas output assembly comprises an air outlet connector for outputting heated gas and a second sealing cover plate. More gas can be treated at the same time through the multi-pipeline design, the gas heating efficiency is improved, and meanwhile, the situation that the industrial gas to be heated is polluted by metal ions is avoided.

The application relates to the technical field of pipeline air tightness detection, and discloses a storage energy pipe air tightness test equipment and a test method, which comprise a detection workbench, a preliminary positioning assembly for preliminarily positioning the storage energy pipe is arranged above the detection workbench, and a water immersion air tightness test assembly for air tightness test of the storage energy pipe is arranged above the detection workbench. The application can integrate multiple function modules such as preliminary positioning, air tightness test, outer wall detection, inner wall detection, classification and work station transfer into one, and realize continuous operation through an automatic control system, so that the integration and automation level of the detection process is greatly improved. Through the principle of 'completing the subsequent detection even if the problem is found', the equipment can help the producer to comprehensively understand the specific defect type and position of each unqualified product, and provide valuable data support for analyzing the process deficiency and carrying out unified improvement.

1. Name of the design product: air supply pipeline (combination). 2. Use of the design product: the design is used for pipeline air supply. 3. Design points of the design product: in shape. 4. Picture or photo that best shows the design points: perspective view. 5. The bottom view is omitted because it is the same as the top view.

The utility model relates to a fresh air system adopting a pipeline air valve to adjust air volume, which comprises a fresh air fan and a controller, each floor in a building is provided with a fresh air supply outlet, an air exhaust outlet and an air quality detection device, the fresh air fan is connected with a fresh air pipeline and an exhaust pipeline, the fresh air pipeline is connected with a fresh air distributor, and the exhaust pipeline is connected with a fresh air outlet. A plurality of fresh air branch pipelines are connected to the fresh air distributor, and fresh air pipeline valves are installed on the fresh air branch pipelines respectively. According to the utility model, factors such as space factors, personnel activity areas and the like are considered, the air volume of the fresh air system is adjusted by adopting a subarea control mode and a pipeline air valve, the corresponding equipment capacity purchase quantity can be reduced in actual use, and the energy loss is reduced.

The utility model discloses a gas meter pipeline gas flow fluctuation simulation device. The gas meter pipeline gas flow fluctuation simulation device comprises a gas output unit, a parameter detection unit, a test branch, a reference branch and a control unit, the gas output unit is respectively connected with the test branch and the reference branch and is used for generating gas flow; the parameter detection unit is used for detecting parameters of airflow; the test branch is used for collecting the accumulated flow of the airflow; the reference branch is used for collecting the instantaneous flow rate of airflow; the control unit is connected with the gas output unit, the parameter detection unit, the test branch and the reference branch and used for obtaining parameters, accumulated flow and instantaneous flow and controlling start and stop of the gas output unit and connection and disconnection of the test branch and the reference branch. The whole process of gas making, gas conveying and gas using can be simulated, and then gas flow fluctuation of a gas pipeline is simulated.

The utility model discloses a municipal road drainage pipeline air bag plugging device which comprises a shell, an air bag is fixedly connected to the end of the left side of the shell, deviation preventing assemblies used for clamping the air bag so as to prevent the air bag from deviating are arranged at the two ends of the left side of the shell, and a fixing block is fixedly connected to the end of the right side of the shell. Through the arrangement of the anti-deviation assembly and the elastic pushing assembly and the two sets of arc-shaped clamping plates installed at the end of the left side of the shell, the air bag is positioned from the two sides, when the air bag is impacted by water flow, position deviation of the air bag can be effectively avoided, and in addition, the elastic pushing assembly can push the air bag to move, so that the safety of the air bag is improved. The clamping force of the arc-shaped clamping plates on the air bag has certain elasticity, when the air bag is inflated and expands, the clamping force can be adjusted in a self-adaptive mode, it is guaranteed that the air bag does not deviate, and the air bag cannot be damaged due to the too large clamping force.

The utility model discloses a pipeline air tightness detection device, which relates to the technical field of pipeline detection and comprises a detection support, a cylinder body, a plunger, a pressing block, a sealing sleeve, a piston rod and a piston, a shell, an end cover, an induction coil and a catalyst layer are arranged outside the pipeline air tightness detection device, and a high-pressure medium is filled into the detection support through external supercharging equipment to push the plunger and the pressing block in the cylinder body to move. When the pressure reaches a preset value, the pressure regulating valve is switched on, a medium flows into the position between the piston and the sealing sleeve, the piston is driven to exhaust air in the pipeline, meanwhile, the induction coil is heated by high-frequency current, the temperature of the catalyst layer is increased, the leaked medium is subjected to catalytic combustion, and resistance change is caused; therefore, rapid and accurate detection of the air tightness of the pipeline is realized.

The utility model relates to the technical field of pipeline air tightness monitoring, and discloses a natural gas conveying pipeline air tightness monitoring device which comprises a conveying pipeline, a lower fixing ring is arranged on the outer wall of the conveying pipeline, an upper fixing ring is attached to the outer wall of the lower fixing ring, and a pressure sensor is fixedly connected to the inner wall of the upper fixing ring. The top of the pressure sensor is fixedly connected with a pressure gauge, pressure plates are arranged on the inner wall of the lower fixing ring and the inner wall of the upper fixing ring, and a fixing assembly is arranged on the outer wall of the lower fixing ring. According to the utility model, the problems that the installation operation is tedious, the leaked natural gas is difficult to collect and store, the resource waste, the environment pollution and the safety risk increase are caused are solved, and the purposes of quickly installing and disassembling, saving the construction and maintenance time, collecting and conveying the leaked natural gas at the same time, realizing the recycling of the gas, reducing the cost and the like are achieved. And resource waste is reduced.

The utility model provides a stainless steel integral ventilation pipeline air shower structure, which relates to the technical field of air showers and comprises an air shower, a top bin, an air supply bin and an air shower channel. Air supply assemblies for blowing air into the air shower channel are arranged in the two air supply bins; each air supply assembly comprises a fan box, a main air supply pipe, a plurality of groups of air outlets and a telescopic air pipe; according to the design, stainless steel design is adopted as a whole, transportation is convenient, deformation is not prone to happening, the service life is long, the heat dissipation effect is good, the heat dissipation effect is good, the heat dissipation effect is good, and the heat dissipation effect is good. The whole air shower is provided with the face recognition access control machine, the electric door and the infrared sensor, the electric door can be opened through face recognition and automatically closed in cooperation with human body sensing, manual operation of workers is omitted, intelligence is high, in addition, a plurality of transverse air blowing and vertical air blowing are formed in the air shower channel, and the air shower is more intelligent. And dust on the body of a worker can be conveniently blown away.

The application relates to the technical field of detection devices, and discloses a pipeline air tightness detection device and method. The pipeline air tightness detection device comprises a first pipe arranged in the inside of a pipe body, a second pipe fixedly arranged at one end of the first pipe, and the inside of the first pipe and the second pipe is in communication. The shell is thrown outwards by centrifugal force, so that the sponge block approaches the inner wall of the second pipe. When there is a leakage hole on the wall of the second pipe, the high-pressure gas will run out of the leakage hole, so as to drive the fluorescent liquid in the sponge block to flow out of the leakage hole and onto the outer wall of the second pipe. Then, the outer wall of the second pipe is irradiated by fluorescence, so that the position of the leakage hole is found. The first pipe is inserted into the inside of the pipe body, and then the rotation of the brush disc drives the brush pieces to clean the inner wall of the pipe body, so that the device can accurately detect the leakage points on the pipe body, and the accuracy of the pipeline air tightness detection is improved.

The utility model discloses an automobile pipeline air tightness detection apparatus, comprising a main body unit comprising a support, a work plate fixedly arranged on the support, and a placing rack fixedly arranged on the work plate; the working unit comprises a starting component arranged in the working plate, an adjusting component is arranged on the starting component, a fixing component is arranged on the adjusting component, and a testing component is arranged on the placing frame. The output end of the second threaded rod drives the clamping block to be separated from the clamping plate, and then the proper working barrel and clamping plate are replaced.

The invention provides an air conditioner pipeline air tightness detection jig, and relates to the technical field of air conditioner pipeline air tightness detection, the air conditioner pipeline air tightness detection jig comprises a sealing pipe mounted on a fixed seat, a piston sleeve is slidably connected in the sealing pipe in a sealing manner, a rubber sleeve is mounted on the piston sleeve, and a follow-up pipe is coaxially mounted in the piston sleeve. A through groove is coaxially formed in the follow-up pipe, an internal pipe is connected in the through groove in a sealed and sliding mode, and a plurality of tail holes and head holes are formed in the front end and the rear end of the internal pipe at equal intervals respectively. The technical bottleneck of traditional detection equipment in a pipeline connection link is solved, the jig adopts an air pressure self-enhancement sealing principle, and a structure of which the sealing performance is synchronously improved along with the increase of pressure is created through the combination of a piston sleeve and a rubber sleeve in a sealing pipe.

The present application relates to pressure pipeline air tightness detection technical field, and disclose a kind of cold storage refrigeration pipeline prefabrication welding and air tightness test method;For solving the problem that stable, repeatable, traceable qualification and threshold quantization of small leakage cannot be achieved in traditional method;The method, first determine boundary data unit and valve position isolation check, access dry nitrogen, reference cavity, double pressure link and near and far end temperature measuring point, initial parameter record;Pipe link and valve position switching self-check are completed under the working condition of reference cavity;Precharge and target pressure are staged inflation, and pressure temperature threshold value is gated to stabilize voltage;Main pressure maintaining period synchronously obtains the pressure temperature data of section to be detected and reference cavity, and periodically rechecks cross verification drift, triggers condition according to partition single valve single step isolation recheck, obtains small leakage stable repeatable traceable determination conclusion.