3497 results about "Air tightness" patented technology

The invention relates to a valve air tightness detection device and a control method, the valve air tightness detection device comprises a base and a plugging assembly provided with a differential sealing unit, the differential sealing unit is matched with an inner floating sealing disc through an outer force bearing seat to form a pressure compensation cavity, and a high-pressure medium is introduced through a through air channel; and the compression area in the cavity of the inner floating sealing disc is larger than that of the abutting end of the valve port. According to the valve airtightness detection device, net thrust generated by a medium on the area difference is used for driving the sealing disc to automatically press the valve port, self-locking sealing is achieved, external huge axial clamping force does not need to be applied, the problems of false sealing and detection distortion caused by valve body deformation due to external loads are effectively solved, and the detection efficiency is improved. Near-live detection for eliminating forced stress interference is achieved, and physical damage to the valve body and a precise assembly is avoided.

The invention provides an air tightness detection device of a pressure balance type plug valve, and relates to the technical field of valve air tightness detection. An air tightness detection device of a pressure balance type plug valve comprises a water pool, an adjusting mechanism, two clamping mechanisms and an end sealing mechanism, the end sealing mechanism comprises two groups of positioning assemblies and two groups of sealing assemblies, and the positioning assemblies and the sealing assemblies are communicated and used for enabling the sealing assemblies to generate axial displacement. The sealing assembly is coaxially arranged in multiple layers, the structures of all the layers of the sealing assembly are the same, the sealing assembly is used for being inserted into an inlet and an outlet of a plug valve to be detected, and by means of the multi-layer design of the sealing assembly and the design that the positioning assembly enables each layer of the sealing assembly to generate independent axial displacement, the plug valve to be detected can be detected. The sealing assembly is adapted to plug valves to be detected with different calibers; the sealing assembly has the action of expansion under the action of air source pressure, so that the part inserted into the plug valve to be detected is in sealed connection with the plug valve, and the sealing performance is ensured.

The invention discloses an adaptive multi-angle elbow airtightness detection method, which comprises the following steps: arranging a flexible pressure sensor array and a micro inertial measurement unit on the inner wall of an elbow, collecting multi-point sealing pressure and attitude signals in real time, fusing geometric parameters and a spatial mapping relation, and completing denoising, normalization and multi-curvature region mapping of pressure data; a distributed pressure-attitude database is combined, a function model associated with sealing pressure and pipeline geometric parameters is established, inflation, exhaust and deformation of each node are dynamically adjusted through an intelligent closed-loop regulation and control algorithm, collaborative optimization of multi-node pressure and a fitting state is achieved, and the sealing performance of the pipeline is improved. According to the method, the accuracy and the self-adaptive adjusting capacity of sealing pressure distribution under a complex bent pipe structure are effectively improved, the tiny leakage real-time positioning and self-learning optimization capacity is achieved, and the method is suitable for sealing quality guarantee of various types of curved surface pipelines.

The invention relates to the technical field of metal die-casting forming, and discloses a vacuum die-casting method for a high-reliability aluminum alloy motor end cover, which comprises the following steps: carrying out acoustic levitation purification treatment on an aluminum alloy melt; detecting the acoustic purity of the purified melt on line by adopting an acoustic characteristic sensing device; feeding the melt into a mold cavity for vacuum die-casting filling; and according to the detection result of the acoustic purity, an electromagnetic coil preset at the hot spot area of the mold is controlled in a feedforward mode, and magnetic field induction partition solidification of the hot spot area is achieved. According to the method, through the synergistic effect of melt purification and solidification control, micro bubbles and inclusions in the melt are removed through acoustic levitation purification firstly, then accurate magnetic field induction partition solidification is conducted on a hot spot area through feedforward control based on melt quality real-time data, formation of microscopic and macroscopic defects is effectively inhibited, and the quality of the melt is improved. The manufactured motor end cover is high in internal density and good in mechanical property and air tightness, and the product reliability is remarkably improved.

The utility model relates to the technical field of air tightness detection, and discloses an air tightness detection device for an automobile engine cylinder cover, which comprises a detection box, supporting cylinders are fixed at four corners of the outer wall of the detection box, a top cover is arranged on the top surface of the detection box, and the detection box and the top cover are made of sound insulation plates. And detection assemblies are arranged in the detection box and on the top surface of the top cover, and each detection assembly comprises a placement frame fixed on the bottom surface of the top cover. According to the utility model, a cooling system filled with an engine cylinder cover is filled with gas through the air pump, then the hydraulic cylinder is started to drive the placement rack to move into the detection box, and the detection box and the top cover are made of sound insulation plates, so that the interior of the detection box is kept in a quiet and relatively closed environment; at the moment, the engine cylinder cover is detected in four directions through the four ultrasonic receivers, and when leaked gas passes through a leakage hole, ultrasonic waves are generated and detected, so that airtightness detection of the engine cylinder cover is realized.

The invention discloses a sealing structure for a test, and an aging test and leakage rate detection method and system. The sealing structure comprises a tested sealing assembly and an air cavity assembly integrated in the tested sealing assembly, and serialized test samples with different filling rates and compression rates are formed by regulating and controlling the groove width and the groove depth of a sealing ring mounting groove so as to simulate various actual sealing states. An aging test adopts a multi-factor coupling accelerated aging method, and a plurality of material characterization means are combined to systematically evaluate the evolution rule of the sealing performance. According to leakage rate detection, static pressure maintaining and dynamic pressure adjusting dual-mode measurement is achieved through an air tightness detector, and the sealing characteristics under different pressure conditions are comprehensively reflected. According to the invention, direct and systematic detection of the leakage rate of the sealing structure is realized, and an innovative solution is provided for sealing performance evaluation and service life prediction of electrical equipment.

The invention discloses a helium detection device and method for the airtightness of a bonding interface and a bonding microcavity, and belongs to the field of the airtightness of MEMS devices. The device comprises a sample holder, a mass spectrometer, a molecular pump, a mechanical pump and other components, helium is used as detection gas, and the helium is leaked only through a bonding interface through a customized and processed test sample and sample holder structure, so that the interference of other leaks in a non-bonding area on a test result is avoided. The testing method comprises the steps of sample introduction, vacuum pumping, helium filling, signal detection, dynamic and steady state testing and the like, the helium leak rate is monitored in real time by combining with a helium mass spectrometer, and the minimum leak detection rate is that high-sensitivity air tightness detection is ensured. According to the method, the airtightness of the bonding interface can be independently evaluated, and a reliable basis is provided for development of a novel bonding process. The method is suitable for air tightness detection and evaluation of the bonding process in MEMS device processing and manufacturing.

The application discloses a rotary table type ultrasonic welding device, which comprises a rack, a rotary table, a supporting device and an ultrasonic welding device arranged on the periphery of the rotary table. The rotary table is rotatably installed on the rack. The rotary table is provided with supporting bolts protruding from the bottom surface of the rotary table. The supporting device is in abutment with the supporting bolts through liftable supporting pieces. When the ultrasonic welding device is pressed for welding, the mounting seat can be supported by the supporting device, so that the rotary table is prevented from being deformed due to the pressing. The rotary table is provided with a mounting seat. The mounting seat comprises a bottom plate installed by leveling screws. The rotary table and the mounting seat can be kept horizontal through the leveling screws. The mounting seat is further provided with elastic washers. The elastic compression of the elastic washers can ensure that the workpiece can keep the airtightness of welding even if the workpiece is slightly inclined when being pressed.

The invention discloses a copper-molybdenum alloy component and a manufacturing method thereof, and belongs to the technical field of alloy manufacturing. Mo powder is sequentially subjected to vacuum drying treatment, oxidation-reduction treatment and coating treatment, so that the Mo powder has good flowability and powder laying uniformity; under the preset 3D printing condition, the porous Mo framework which is stably formed and complex in structure can be obtained, the problems that an existing rolling composite method is complex in technological process, strict in technological requirement and the like are solved, and the method is suitable for manufacturing parts with small sizes or complex shapes; the porous Mo framework is subjected to vacuum thermocuring and Cu infiltration treatment, and the obtained copper-molybdenum alloy component is excellent in compactness, high-temperature stability, interface bonding strength, heat conduction, electrical conductivity and the like. The problems that a copper-molybdenum alloy obtained in the prior art is poor in wettability and low in density and uniformity, and the mass content of copper is lower than 30%, so that the heat conductivity, the electric conductivity, the air tightness and other performance are low are solved.

The invention relates to the technical field of air tightness detection, in particular to a diaphragm type energy accumulator air tightness detection method which is used for solving the problems that in the prior art, equipment operation characteristics cannot be accurately described, typical defect modes cannot be recognized in combination with spectral clustering, and a quantitative basis cannot be provided for equipment fault trend analysis and intelligent maintenance. The method comprises the following steps: constructing a low-dimensional state map to describe equipment operation characteristics, identifying typical defect modes in combination with spectral clustering, establishing a nonlinear correlation model to reveal a defect evolution relationship, optimizing classification model parameters by adopting an evolutionary algorithm, improving the identification accuracy, mining a most probable defect evolution path based on a transition probability matrix, and improving the identification efficiency. And a quantitative basis is provided for equipment fault trend analysis and intelligent maintenance.

The utility model discloses an air tightness detection system of a hydraulic clutch. The air tightness detection system comprises a controller, a sliding frame, a connecting seat and a detection box body, a slot connected with the end part of the hydraulic clutch is formed in the connecting seat; a first air inlet communicated with the first working cavity and a second air inlet communicated with the second working cavity are respectively formed in two opposite side walls of the slot; a part of detection pipelines for the first working cavity and the second working cavity are respectively arranged on the connecting seat and in the detection box body, the detection pipeline in the detection box body is connected with a compressed air source outside the detection box body, and the detection pipelines for the first working cavity and the second working cavity on the connecting seat are respectively communicated with the first air inlet and the second air inlet; and the controller is in signal connection with the execution element and the detection element on the detection pipeline. The air tightness detection system is arranged at the edge of the production line, and compressed air is adopted to replace oil, so that the test cost is reduced, pollution and consumption are reduced, and the labor intensity is reduced.

The invention provides an inflatable package air tightness detection device and detection method, and relates to the technical field of package detection. A top cover is arranged at the top of the detection box, a pressure sensor is arranged at the bottom of the top cover, a negative pressure pipe is arranged on the detection box and communicated with a negative pressure system, an outer cover is arranged in the detection box and connected with the top cover, a plurality of detection covers are connected to the inner side of the outer cover, and the detection covers are sequentially and tightly connected into a whole. All the detection covers are connected to form an enclosed shape which is matched with the side part and the top of the detected inflatable package, the detection covers and the top of the outer cover are communicated with a detection pipe, the top end of the detection pipe is open, the detection pipe is provided with a detection sleeve, and the detection sleeve is provided with a photoelectric detection assembly. According to the invention, whether bubbles pass through an optical signal path or not is detected through photoelectric sensing, manual eye detection is replaced, the bubble detection accuracy is improved, and detection errors are avoided.

The invention relates to the technical field of sonar buoy detection, in particular to a multi-channel positive and negative pressure airtightness detection system which comprises an equipment cabinet, a high-pressure pump, a vacuum pump, a computer and a detected cabin. The equipment cabinet is provided with two ventilation air paths which are respectively connected with the high-pressure pump and the vacuum pump, the balance tank and the detected cabins are inflated or deflated by controlling valves in the air paths, and a differential pressure sensor is used for detecting the pressure difference value of the balance tank and the detected cabins to judge whether the balance tank and the detected cabins leak air or not. According to the invention, by outputting multiple detection channels, multiple detected cabins can be detected at the same time and independent detection results can be given, so that the detection efficiency is improved; the airtightness detection system is simple in composition structure, does not need additional high-pressure-resistant sealing tanks and tools, adopts the differential pressure type sensor to improve the test precision and accuracy, and is convenient to operate, safe and reliable.

The invention provides an inflator pump air tightness detection method and system based on TPMS feedback and flow modeling, and the method comprises the steps: obtaining a real-time pressure fluctuation signal and an instantaneous flow fluctuation waveform of an inflator pump gas conveying pipeline, and extracting a corresponding relation between a continuous change rule of a pressure gradient and a flow peak appearance moment; on the basis of the corresponding relation and a three-dimensional structure model of a sealed cavity in the inflator pump, pressure gradient spatial and temporal distribution and flow peak spatial and temporal distribution in the gas flowing process are reconstructed, the flowing track of gas in a pipeline is traced, and the spatial mapping relation between a flow abnormal fluctuation area and a pressure attenuation change area is recognized; and comparing the gas flow path with a gas flow path in a standard sealing state, positioning a key node of sealing failure in combination with a space mapping relationship, and determining the quantification level of the air tightness defect of the inflator pump according to the abnormal change degree of the key node and in combination with the distribution characteristics and mutual influence of the plurality of key nodes. According to the invention, the accuracy and reliability of air tightness detection are effectively improved.

The utility model relates to the technical field of cosmetic containers, in particular to an airtight powder box which comprises a bottom box, a box cover, a rotating shaft, an inner cover and an inner box, a rotating groove is formed in one side of the bottom box, an adapter block is arranged on the bottom face of one side of the box cover, a cover opening and closing movable cavity is formed in the middle of the adapter block, and the rotating shaft is arranged on the bottom box and penetrates through the rotating groove. The rotating shaft penetrates through the opening and closing cover moving cavity, the opening and closing cover moving cavity comprises a covering clamping hole, a through groove and an uncovering clamping hole which are communicated in sequence, the rotating shaft can be clamped with the covering clamping hole or the uncovering clamping hole, the inner diameter of the covering clamping hole is equal to that of the uncovering clamping hole, the diameter of the rotating shaft is not larger than that of the covering clamping hole, and the width of the through groove is smaller than that of the rotating shaft; the adapter block is movably arranged in the rotating groove; when the rotating shaft is clamped in the covering clamping hole, the inner box is covered with the inner cover, the bottom box is covered with the box cover, and the covering face of the box cover is tightly attached to the top end face of the bottom box. Through the cooperation of the opening and closing cover moving cavity and the rotating shaft, the stability of the opening and closing cover is good, and the air tightness in the covering state is good.

The invention relates to the technical field of medical instruments, and discloses an endoscope light guide plug with an air tightness self-checking function, which comprises a plug shell, a sealing ring is fixedly connected to the inner wall of the plug shell, a light guide unit is fixedly connected to the inner wall of the plug shell, an air inlet pipe I penetrates through the outer wall of the plug shell, and an air inlet pipe II penetrates through the outer wall of the plug shell. And an air inlet pipe II penetrates through the inner wall of the plug shell. When the filter plate is replaced through the dismounting mechanism, a knob is rotated to drive a locking rod and a limiting rod to rotate, so that the limiting rod is aligned with a communicating groove, a spring I pulls a guide sheet to move along a sliding groove, and the locking rod is separated from a locking groove, so that the plate can be taken; during installation, the filter plate is placed, the knob is pulled to enable the locking rod to be aligned with the locking groove, the locking rod is clamped after loosening, the knob is rotated to enable the limiting rod and the communicating groove to be staggered and fixed, the filter plate is rapidly disassembled and assembled, cleaning or replacement is convenient, the filter plate is prevented from being blocked to affect a gas path, the gas filtering effect is guaranteed, the maintenance time and cost are reduced, and the long-term use stability of equipment is improved.

The invention discloses a preparation method of a high-density carbon-carbon composite material, which comprises the following steps: soaking a needled prefabricated body in a resin mixed solution, vacuumizing and dipping, drying in a drying oven, then putting into a mold, carrying out hot-pressing curing molding, and carbonizing to obtain the high-density carbon-carbon composite material. According to the preparation method, the carbon-carbon composite material with the density larger than 1.2 g / cm < 3 > can be obtained through one-time dipping and one-time hot pressing, the production period is short, energy consumption is low, the production cost is remarkably reduced, and the carbon-ceramic composite material with the density larger than 1.2 g / cm < 3 > can be obtained through one-time dipping and one-time hot pressing. And the prepared carbon-carbon composite material can achieve a high-density effect when the density is low, and has the characteristics of good air tightness, difficulty in deformation at high temperature and the like.

The invention discloses a pneumatic internal expansion type battery pack upper cover air tightness detection tool which comprises a bottom plate installed in the center of a detection platform. The nylon imitation block is installed in the center of the surface of the bottom plate, a penetrating opening is formed in the middle of the nylon imitation block in a penetrating mode, and the penetrating opening is closed by a to-be-detected workpiece and the bottom plate to form a detection cavity; an air hole is formed in the bottom of the bottom plate in a penetrating mode, and an expansion chuck of the pneumatic inner support expansion clamp is arranged in the air hole; the air hole can be sealed or opened by expansion of the expansion chuck. The air hole for exhausting is formed in the bottom of the bottom plate on the detection platform, the pneumatic inner support expansion clamp is arranged below the bottom plate, and the expansion chuck of the pneumatic inner support expansion clamp is arranged in the air hole so as to contract when the to-be-detected workpiece is pressed to the nylon imitation block, and the air hole is opened to exhaust air in a gap. And after the workpiece to be detected is completely pressed on the nylon imitation block, the workpiece expands to block the air holes for air tightness detection, so that the influence of gap air on a detection value is effectively reduced.

The utility model discloses an oil-gas separator airtight detection device in the field of automobile part manufacturing, which comprises a base, a vertical quick clamp, a plug assembly and a plug driving piece, the vertical quick clamp is used for fixing an oil-gas separator on the base, the oil-gas separator comprises an oil return port, an air inlet joint and an air outlet joint, and the plug assembly is used for fixing the oil-gas separator on the base. The outer side of the base is provided with an air inlet connector, an air channel is formed in the base, the air inlet connector is communicated with the oil return opening through the air channel, and the plug driving piece is used for driving the plug assembly to be close to or away from the oil-gas separator so as to plug or open the air inlet connector and the air outlet connector. The oil-gas separator airtightness detection device is simple in structure, high in automation degree and good in stability, and can effectively carry out airtightness detection on the oil-gas separator.

The invention discloses a near-zero-energy-consumption building dynamic airtightness AI diagnosis and self-adjustment method, and relates to the technical field of building airtightness adjustment, and the method comprises the following steps: deploying multiple types of sensors for real-time monitoring, and processing original data; extracting a plurality of features in a fixed time window to form a time sequence feature matrix; analyzing the coupling relationship between the door opening event and the pressure fluctuation, and calculating an abnormal score to identify door disturbance dominant imbalance; for NOT gate disturbance, using a time sequence convolutional network to predict future differential pressure deviation, and tracing a main disturbance source through gradient analysis; according to the traceability result, the air volume needing to be compensated is calculated and converted into an air supply valve opening instruction to be sent to the actuator; and automatically adjusting an anomaly detection threshold value according to historical data every week, and updating the prediction model online by adopting incremental learning. According to the invention, accurate and rapid identification of the air tightness dominant disturbance source and adaptive compensation of the air volume can be realized.

The present utility model relates to the field of roll-on / roll-off apparatuses. Disclosed is an airtight door for a passage apparatus of a roll-on / roll-off ship, the airtight door comprising an inclined ramp, a door body and a horizontal passage, wherein the door body is arranged between the inclined ramp and the horizontal passage; the door body is hinged to the horizontal passage by means of a hinge having an oblong hole; a sealing assembly is provided on the door body; a door frame is provided on the horizontal passage; the door body and the door frame are arranged to fit each other, and the door body and the door frame are both obliquely arranged; a push-pull device is mounted in the horizontal passage; a slider is connected to one end of the push-pull device; and a support connecting rod is hinged to the slider, and the support connecting rod is hinged to the door body. The airtight door for a passage apparatus of a roll-on / roll-off ship provided in the present utility model can make full use of the door's own weight to perform compression sealing, has strong airtightness and a good sealing effect, is safe, stable and reliable, has a simple structure, and is easy to maintain; besides this, the airtight door achieves a design without a door sill raised from the ground, does not hinder the passage of vehicles or the transport of goods, and has strong applicability.

The invention relates to the technical field of fuel cell membrane electrode testing, and discloses a fuel cell membrane electrode airtightness testing system and method, and the system comprises a tool clamp which comprises a cavity and a clamping assembly, the cavity is in a shell shape, and the top of the cavity is open; the clamping assembly is used for clamping a sample membrane electrode and sealing and fixing the sample membrane electrode at the top opening of the chamber; the gas supply mechanism is used for supplying helium to the inner cavity of the chamber, enabling the inner side pressure of the sample membrane electrode to be higher than the outer side pressure and forming a stable pressure difference; and the detection mechanism comprises a helium leak detector and a mechanical arm, and the mechanical arm grabs the helium leak detector to carry out global detection and smelling on the outward surface of the sample membrane electrode to find leakage points and records the leakage rate of each leakage point. According to the air tightness test system and the test method, whether the membrane electrode leaks or not can be conveniently and efficiently judged, the position of a leakage point is positioned, and the area of the leakage point is estimated.

The positioning device comprises a disc body, the edge of the surface of the disc body is provided with a step which is formed in a protruding mode and used for supporting the edge of the wafer, a groove is formed in the position, located on the inner side of the step, of the surface of the disc body, an air inlet hole is formed in the center of the bottom face of the groove, and a negative pressure annular groove surrounding the air inlet hole is formed in the position close to the step. The air inlet hole is used for inputting air into the groove to form an air film so as to enable the wafer to be in an air floating state, and the negative pressure ring groove is configured to be suitable for providing a negative pressure environment so as to enhance the air tightness between the edge of the wafer and the step; the clamping parts are arranged on the step at intervals in the circumferential direction, the clamping parts are configured to be heating expansion bodies, the clamping parts clamp the wafer after being heated and expanded, and the clamping force is suitable for providing friction force for the wafer in the high-speed rotating state of the disc body so that the wafer can synchronously rotate along with the disc body. The method has the beneficial effects that the damage to the wafer is reduced, and particles generated in a detection environment are reduced.

The invention relates to an air tightness detection device and method based on resonance frequency shift of a resonant cavity, belongs to the technical field of air tightness detection, and aims to solve the problems of high equipment cost, complex operation, low efficiency and difficulty in realizing multi-parameter quantitative detection in the traditional air tightness detection technology. High-purity helium with rated pressure is filled into a to-be-detected piece through a gas compressor, the to-be-detected piece is placed in a volume-adjustable detection container after pressure maintaining, and leaked helium is pumped by a vacuum pump to flow into a resonant cavity; resonance frequency deviation caused by helium concentration changes is monitored, temperature and humidity calibration data are combined, three air tightness parameters including the leakage rate (Pa.m / s), the leakage speed (mL / min) and the leakage pressure (Pa) are calculated in real time through a microcontroller, and the air tightness grade of a to-be-detected piece is output according to the air tightness detection standard. According to the device, the volume of the detection container is adaptively adjusted through the sliding rail, and the detection efficiency and adaptability can be remarkably improved by combining frequency mixing excitation and a rapid frequency calibration technology; according to the method, resonance frequency shift-helium concentration-airtightness parameters are converted, and high-precision, multi-parameter and integrated airtightness detection is realized. The invention has the advantages of fast response speed, strong anti-interference performance, low cost and the like, is suitable for fast automatic leak detection of industrial products such as sealing devices, pressure containers and the like, and provides a new scheme for trace gas detection and gas tightness grading.

The application discloses a kit assembly production line and an assembly production method, wherein the kit assembly production line comprises a first conveying mechanism, a sealing detection unit and a second conveying mechanism arranged in sequence, the first conveying mechanism is sequentially provided with a box body feeding unit, a cover plate feeding unit, a welding unit and an appearance detection unit, the second conveying mechanism is provided with a kit assembly unit, a first buffer conveying belt is arranged between the first conveying mechanism and the sealing detection unit, and a second buffer conveying belt is arranged between the sealing detection unit and the second conveying mechanism. The kit assembly production method sequentially arranges multiple combined cup assemblies between adjacent combined cup assemblies with the same spacing before and after the air tightness detection, eliminates the vacancy of the rejected combined cup assembly, facilitates the smooth progress of subsequent processes, solves the technical problem that the vacancy of the rejected combined cup assembly affects the next process, and improves the production efficiency.

The invention discloses a pump head airtightness detection system based on an intelligent sensor, and belongs to the technical field of airtightness detection. The system specifically comprises the following steps that S1, a historical data acquisition module acquires pump head air tightness detection multi-source historical sample data and transmits the pump head air tightness detection multi-source historical sample data to a data preprocessing module; and S2, the data preprocessing module preprocesses the obtained multi-source historical sample data, and performs physical noise reduction and calibration on the multi-source historical sample data. Three types of multi-source data of acoustics, pressure and thermotics are collected, normal parts, leakage parts, vibration, temperature change and other interference working conditions are covered, all-directional description of the air tightness state of the pump head is achieved, limitation of a single data dimension is avoided, and a special optimization method is adopted for different types of data. The environmental noise is effectively filtered; the pressure data is subjected to curved surface fitting through Kriging interpolation, and abnormal values introduced by fluctuation of the sensor are eliminated.

The invention relates to the technical field of valve air tightness detection, and discloses an automatic pressurization air tightness detection method and system for a high-pressure valve, and the method comprises the steps: determining the effective volume and background leakage rate of a test loop, completing the pre-debugging of a valve seat and a seal, supplying air to the test loop, building dual criteria, and when an isothermal steady-state condition is satisfied, carrying out the automatic pressurization air tightness detection of the high-pressure valve. The method comprises the following steps: connecting a reference sealing cavity in parallel in a test loop, counteracting environment drift and slow change of gas supply, and calculating a leakage rate and deducting a background leakage rate according to the change of effective volume and pressure of the test loop along with time and the change of gas temperature along with time in combination with a real gas compression factor. And when the difference value between the gas temperature and the valve body temperature exceeds a temperature difference judgment threshold value, the leakage rate is corrected. And comparing the leakage rate with a preset leakage rate threshold value to obtain a judgment result. According to the invention, the voltage stabilization time is shortened, the thermal transient state and environmental drift are inhibited, and the small leakage detection capability, the result consistency and the judgment accuracy of the high-pressure valve are improved.

The utility model provides an automation device used for airtightness detection of silica gel piece products, comprising an airtightness detector, the airtightness detector comprises an inflation nozzle, a pressure sensor, an inflation pump and a control box, the automation device also comprises a work bench and a controller, and two sides of the work bench are divided into a feeding area and a detection area; the feeding area is provided with a horizontal moving mechanism. The horizontal moving mechanism comprises a first air cylinder, a linear guide rail and a sliding table. The detection area is provided with a protective cover and a vertical moving mechanism; the utility model aims to provide the automatic equipment for detecting the airtightness of the silica gel piece product, after the product is automatically moved to a detection area along the linear guide rail, the lifting rod of the vertical moving mechanism drives the lifting plate to move downwards to press the product, and the airtightness instrument starts to detect; meanwhile, airtightness detection is performed on multiple products, and the detection efficiency is improved.

The invention relates to the technical field of hub air tightness detection, in particular to air tightness detection equipment for automobile hub production. Comprising a first electric push rod fixedly connected to a shell, a telescopic part of the first electric push rod is fixedly connected with a water tank, the shell is fixedly connected with a second electric push rod, the bottom of the water tank is in sealed sliding connection with a sliding frame, the shell is fixedly connected with a third electric push rod, the sliding frame is fixedly connected with a protective shell, and a first outer sleeve is fixedly connected into the protective shell; a first inner sleeve rod is slidably connected into the first outer sleeve and fixedly connected with a pressure sensor. The position of the through hole in the surface of the hub is positioned through the pressure change received by the pressure sensor, so that the influence of water flow fluctuation, bubble movement and glass refraction on the determination of the position of the through hole is reduced, the positioning precision of the through hole is improved, subsequent maintenance of the through hole is facilitated, and the service life of the hub is prolonged. And therefore, the hub airtightness detection efficiency can be improved.

The invention relates to the technical field of air tightness detection, in particular to an air tightness detection method and system for a plastic pipe connecting piece, and the method comprises the steps: obtaining real-time pressure data and associated temperature data of the interior of a detected plastic connecting piece in an inflation and pressure maintaining process; inputting the real-time pressure data into a temperature and pressure coupling model for pressure value compensation correction to obtain a compensated pressure value only reflecting the leakage effect; performing time sequence change analysis on the compensated pressure value, and identifying and determining a starting time point when the pressure enters a stable state; extracting the dynamic attenuation characteristic of the compensated pressure value; and performing matching degree calculation on the dynamic attenuation characteristics and the reference model of the leakage-free basis behavior to generate an air tightness detection result of the plastic pipe connecting piece. According to the invention, the problem of interference of non-leakage factors such as environment temperature in air tightness detection is effectively solved, the inhibition capability of interference of non-leakage factors such as temperature is enhanced, and the accuracy and reliability of a detection result are improved.