103 results about "Helium mass spectrometer" patented technology

A water hydraulic cylinder impact leakage detection test bench based on helium detection, the test bench comprising a test bench body, a water hydraulic cylinder (12), a helium cylinder (14), a sealed container (16) and an impact device, wherein the water hydraulic cylinder (12) is detachably mounted on the test bench body; an outlet end of the helium cylinder (14) is in communication with a rodless cavity of the water hydraulic cylinder (12), and a pressure-reducing valve (13) is mounted between the helium cylinder (14) and the water hydraulic cylinder (12); the sealed container (16) is detachably mounted in a rod cavity of the water hydraulic cylinder (12), and a helium mass spectrometer leak detector (15) is mounted on the sealed container (16); and the impact device is fixedly mounted on the test bench body, is connected to a piston rod of the water hydraulic cylinder (12), and is configured to provide impact power for the water hydraulic cylinder (12). The test bench uses an accumulator (6) as a pressure power source, which can provide rapid, stable and high-flow oil, thereby solving the problem of the pressure and flow of ordinary hydraulic pumps failing to meet test requirements; and compared with traditional impact generation by using hammer dropping, the test bench can precisely control the magnitude of the generated impact by means of the pressure of the accumulator (6), and is safe and reliable.

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 invention discloses a leak detector leak rate prediction method based on function fitting and correlation analysis, and relates to the technical field of helium mass spectrometer leak detector detection.The leak detector leak rate prediction method comprises the steps that a leak rate and time associated sequence corresponding to a leak hole is collected, function fitting processing is conducted on the leak rate and time associated sequence, and a leak rate attenuation feature model is obtained; then a real-time data fitting model corresponding to the leak hole is collected, correlation analysis is carried out on the real-time data fitting model and the corresponding leak rate attenuation feature model, and a correlation analysis result is determined; and finally, on the basis of the correlation analysis result, the leak rate of the leak hole is predicted, a leak rate prediction result is determined, the judgment time can be greatly shortened in any leak rate range, and the leak detection efficiency is greatly improved.

The invention discloses a helium detection device of a membrane electrode and a detection method of a membrane electrode string leakage point, and belongs to the technical field of PEM water electrolysis hydrogen production. The helium detection device comprises a helium source, a membrane electrode to be detected, a porous material, a vacuum adsorption assembly, a vacuum pump and a helium mass spectrometer. The vacuum adsorption assembly adopts a cavity design, a plurality of adsorption holes are formed in the upper surface of the vacuum adsorption assembly, the porous material is placed on the upper surface of the vacuum adsorption assembly, a membrane electrode to be detected is placed on the porous material, and air in the cavity of the vacuum adsorption assembly is pumped out by a vacuum pump to form negative pressure; spraying a proper amount of helium to the surface of the membrane electrode to be detected on the porous material by using a helium source; and performing mass spectrum detection on the gas extracted by the vacuum pump by using a helium mass spectrum analyzer so as to analyze the series leakage point of the membrane electrode to be detected. The method is easy to operate and short in testing time, and nondestructive testing of the membrane electrode can be achieved. The detection precision is high, the reliability is strong, and the membrane electrode string leakage point can be qualitatively and quantitatively detected.

The invention relates to the field of metal corrugated pipe leakage detection, and discloses a fixing device for metal corrugated pipe leakage detection and a helium mass spectrum leakage detection system, and the fixing device comprises a first device body and a second device body which are opposite to each other in a first direction and are arranged in a spaced manner to form an assembly space, a first communication hole is formed in at least one of the first device body and the second device body; the adjusting mechanism is used for adjusting the spacing distance between the first device body and the second device body in the first direction so as to change the size of the assembly space in the first direction. Therefore, through cooperation of the first device body, the second device body and the adjusting mechanism, the size of the assembling space in the first direction can be changed, metal corrugated pipes of different length sizes can be assembled in the assembling space, and therefore the universality of the fixing device can be improved, and the fixing device is simple in structure and convenient to use. And the assembly efficiency of the fixing device is improved, so that the leak detection efficiency of the metal corrugated pipe is improved.

The invention relates to the technical field of cooler leakage detection, and discloses automobile engine oil cooler production leakage detection equipment, which comprises a supporting seat, the top of the supporting seat is fixedly connected with a detection assembly, the top of the inner ring of the detection assembly is provided with a lifting assembly, and the middle part of the side wall of the lifting assembly is movably connected with a pressing plate. A conveying assembly is movably connected to the side wall of the supporting base, clamping assemblies are arranged at the two ends of the bottom of the lifting assembly, and a monitoring assembly is arranged on the front side of the pressing plate. Array sensors in the detection assembly are accurately arranged, and a pressure sensor array is matched with a helium mass spectrum sensor array, so that accurate leakage positions of the cooler can be rapidly detected; the lifting assembly links the pressing plate and the clamping assembly, the hydraulic cylinder drives the pressing plate to press the top of the cooler, the inflator controls the left and right clamping plates to seal the two sides of the cooler, and efficient detection and pressure application are achieved. The conveying assembly, the conveying assembly and the positioning assembly cooperate with one another to automatically complete conveying and positioning of the cooler.

The invention belongs to the technical field of cementing technologies and adhesives, and discloses a low-stress cementing sealing structure of a spherical zinc sulfide window, which is used for realizing butt joint of an aluminum alloy outer cover (2) and the spherical zinc sulfide window (1), and cementing sealing of the lower part of the outer wall of the spherical zinc sulfide window (1) and the upper part of the inner wall of the aluminum alloy outer cover (2). After the sealing assembly is used for sealing the zinc sulfide window, the overall leakage rate of the window (the sealing assembly is placed in a metal sealing container, a standard leakage opening is formed in the container, and the leakage rate is tested at the leakage opening through a helium mass spectrometer) is reduced to 10 <-8 > Pam < 3 > / s from 10 <-7 > Pam < 3 > / s sealed through traditional silicon rubber, the order of magnitude is reduced, and the sealing qualification rate is increased to 98% or above from 80%; compared with traditional epoxy resin sealing, the risk that the window deforms and even cracks is greatly avoided.

The invention discloses a fault prediction system and prediction method for a helium filling recovery system of helium mass spectrum equipment, and the system comprises a data collection module which is connected with a PLC of the helium mass spectrum equipment through an industrial communication protocol, and collects multi-source original data in real time; the data fusion processing module is connected with the data acquisition module and used for performing data cleaning, data segmentation, data association and data integration processing on the multi-source original data and performing intelligent classification on the original data based on a preset algorithm; and the fault prediction module is connected with the data fusion processing module, is used for carrying out intelligent analysis on the data, comprises a decision tree prediction unit, a convolutional neural network prediction unit and a model switching unit, and is used for outputting a fault probability or a fault type. The method not only can accurately predict potential faults, but also can easily adapt to different application requirements and technical upgrading through a flexible modular architecture, and can remarkably enhance the reliability and maintenance efficiency of helium mass spectrum equipment.

The invention relates to the technical field of heat exchanger sealing performance detection, in particular to a heat exchanger sealing performance detection device, which is matched with a helium mass spectrometer leak detector to detect the tube pass sealing performance of a tube type heat exchanger, and comprises a rectangular frame and positioning wheels arranged at four corners of the rectangular frame, two detection mechanisms which are distributed up and down are arranged on the rectangular frame, each detection mechanism comprises a transverse sliding rail, a longitudinal sliding rail and a detection assembly, each detection assembly comprises a first suction gun which swings in a reciprocating mode and a second suction gun which moves along with the first suction gun, the tail end of each first suction gun points to the outer surface of the end of the tube bundle, and each second suction gun elastically moves front and back and extends into the tube bundle. The two suction guns are used for capturing helium in the annular welding position of the heat transfer tube and the tube plate and the interior of the heat transfer tube, so that leakage detection is carried out, detection errors caused by detection distance changes due to the fact that the suction guns are manually held by hands are reduced, and the efficiency of carrying out sealing performance detection on the large tubular heat exchanger is improved.

The invention relates to the technical field of vehicle-mounted liquid hydrogen cylinder detection, and discloses a vehicle-mounted liquid hydrogen cylinder vibration test method, which comprises the following steps: filling a gas cylinder with hollow glass beads of which the density is close to that of liquid hydrogen; the helium is cooled through a helium refrigerating device, and the helium is continuously introduced into the gas storage bottle, so that the temperature of the hollow glass beads is consistent with the temperature of the liquid hydrogen; sleeving a helium cover on the gas storage bottle, and vacuumizing the inside of the helium cover; formulating a vibration loading scheme according to the actual driving condition of the vehicle; in the vibration loading process, the concentration of helium in the helium cover is monitored in real time through a helium mass spectrometer leak detector, and if helium leakage is detected, the test is stopped; after vibration loading is finished, a helium mass spectrometer leak detector is used for detecting whether leakage occurs at the joints of the valve, the pipeline joint, the inner container and the shell of the gas storage cylinder or not; the heat insulation performance of the gas storage cylinder is judged; the structural integrity of the gas storage cylinder is detected through visual inspection and an ultrasonic detector; according to the method, liquid hydrogen working conditions are accurately simulated, test safety is guaranteed, and test efficiency is improved.

The invention discloses a molten salt check valve helium leak detection device and method, and belongs to the technical field of molten salt check valves. The problems that in the prior art, leakage rate detection is inaccurate, and the leakage position is difficult to find are solved. According to the technical scheme, a helium source is sequentially connected with a first pressure gauge and a spray gun, the left side of a fused salt check valve is connected with a helium mass spectrometer leak detector and an auxiliary vacuum pump, and the right side of the fused salt check valve is sequentially connected with a second pressure gauge, a second electric stop valve, a second quick cut-off valve and a second release valve; and a calibration leak hole is formed in the fused salt check valve. According to different use conditions, a proper detection method can be selected to determine the leakage amount of a leakage point, and if a vacuum leakage detection test exceeds the standard, the method is continued to find out the position of the leakage point, so that repair is facilitated; detection cost is low, and equipment is simple; detection results are visual, and leakage positions are easy to judge.

The present application relates to a kind of detection systems for detecting the leak of the inner tube of vacuum insulated pipeline of test station, including the vacuum insulated pipeline for transmitting the low-temperature liquid generated by cryogenic refrigerator to distribution valve box, the vacuum insulated pipeline is connected with at least one helium mass spectrometer leak detector;Wherein, the vacuum insulated pipeline is welded by several prefabricated sections through corresponding transition section, each prefabricated section includes internal pipeline, external pipeline and vacuum interlayer between internal pipeline and external pipeline, vacuum safety plug is arranged on the external pipeline of each prefabricated section, and at least one prefabricated section is connected with an auxiliary evacuation system.The present application also relates to a kind of detection method for detecting the leak of the inner tube of vacuum insulated pipeline of test station.The present application realizes the detection of the inner tube of vacuum insulated pipeline section by section, can accurately and quickly determine the inner tube with leak, and quickly and accurately locate the leak range, improve detection efficiency and detection accuracy.

The utility model discloses a combined helium mass spectrometer leak detector, which comprises a shell and an interface integrated at the top of the shell, the top of the interface is fixedly connected with a vertical ring, a step is formed between the vertical ring and the top of the interface, and the outer surface wall of the vertical ring is sleeved with a flange joint. In the application, when the external pipeline is in flange connection, the connection between the flange joint and the interface is kept, and the positioning rod is rotated to be screwed with the inner surface wall of the outer frame until the open end of the positioning rod abuts against the outer surface wall of the flange joint, so that the positioning of the flange joint is realized through friction force, and the connection with the external pipeline can be subsequently realized through an external fastener; similarly, when an external pipeline is inserted, the pipeline is inserted into the outer surface wall of the vertical ring, and the positioning of the pipeline is realized through the positioning rod, so that the connection stability of the external pipeline and the joint is ensured, different connection requirements can be met, and the application range of the helium mass spectrometer leak detector is expanded.

The invention provides a connector flange leak rate rapid detection device and method. The connector flange leak rate rapid detection device comprises a helium tank, a pressure reducing valve, a spray gun, a passive standard leak hole, a stop valve, a connector, a connector flange, a flange overall leak detection tool, a vacuum corrugated pipe and a helium mass spectrometer leak detector. A cavity is formed in the flange integral leakage detection tool, and a flange interface is formed on the edge of the top of the upward opening; a connector flange to be detected is placed above a flange interface of the flange integral leak detection tool and is in sealed connection with the flange interface, and a connector is inserted into the connector flange to be detected. The helium mass spectrometer leak detector is connected to the interior of the flange integral leak detection tool through a vacuum corrugated pipe; the passive standard leak hole is connected to the interior of the flange integral leak detection tool through a stop valve. The spray gun is connected to the helium tank through the pressure reducing valve, and a nozzle of the spray gun faces the connector. According to the invention, the overall leakage rate of the connector flange can be rapidly detected, the leakage point of the connector flange can be rapidly positioned, and the workload of the leakage rate detection of the connector flange can be reduced.

The invention discloses an air tightness detection device for a corrugated pipe compensator. The air tightness detection device comprises a first blind flange, a second blind flange, a fastening assembly, a sealing assembly, an air exhaust connecting pipe, vacuumizing equipment, a vacuum gauge, a vacuum baffle valve, a helium mass spectrometer leak detector and an external helium spray gun. The invention also discloses a bellows compensator air tightness detection method. The method comprises the following steps: S1, assembling and sealing; s2, performing initial inspection; s3, vacuumizing is carried out; s4, maintaining pressure and observing; and S5, judging a result. The technical scheme of combining negative pressure vacuum and helium mass spectrum leak detection is adopted, the characteristics that helium molecules are small in diameter, low in background content and high in response speed are utilized, the leak detection sensitivity is extremely high and is far superior to a traditional bubble method, a negative pressure maintaining method and an SFsniffing method, high-precision detection can be stably achieved, and the leak detection accuracy is greatly improved. The device can meet the requirements of extra-high-voltage GIL pipelines, chemical high-risk medium pipelines and other scenes with extremely high requirements for sealing performance, and the reliability and accuracy of detection results are greatly improved.

This utility model relates to the field of leak detection technology for ceramic orifice plate heater assemblies, and discloses a tooling for leak detection of ceramic orifice plate heater assemblies, including a leak detection tooling base and a leak detection tooling cover. The upper end of the leak detection tooling base is provided with an annular sealing structure that seals with the bottom of the ceramic orifice plate heater assembly, and the lower end is provided with an interface adapted to a helium mass spectrometer leak detector. The leak detection tooling cover is provided with a conical sealing structure that matches the shape of the outer wall of the metal gas cone of the ceramic orifice plate heater assembly, and the top of the leak detection tooling cover is provided with a narrow-hole sealing structure. The annular sealing structure is a first annular groove, and the conical sealing structure is a second annular groove. The upper end of the leak detection tooling base is also provided with two symmetrically distributed positioning holes, the center distance of which is the same as the mounting hole distance of the metal rivets at the bottom of the ceramic orifice plate heater assembly. This utility model has a simple structure, good sealing performance, and can effectively detect the airtightness of ceramic orifice plate heater assemblies.

The invention discloses a double-backing-pump helium mass spectrometer leak detector with switchable gas extraction modes, and belongs to the field of helium mass spectrometer leak detectors, the double-backing-pump helium mass spectrometer leak detector comprises a detection box, the top surface end of the detection box is provided with a leak detection port, the detection box is internally provided with a gas extraction system, and the gas extraction system comprises a first backing pump and a second backing pump which are arranged in the detection box. A first pipeline is connected to an extraction opening of the first backing pump, the end, away from the first backing pump, of the first pipeline is inserted and fixed to the bottom end of the leakage detection opening, a second pipeline is connected to an extraction opening of the second backing pump, the end, away from the second backing pump, of the second pipeline is fixed to the peripheral face of the first pipeline, and a third pipeline is connected to an air outlet of the first backing pump. The end, away from the first backing pump, of the third pipeline is fixed to the peripheral face of the second pipeline, a first electromagnetic valve is arranged on the third pipeline, a second electromagnetic valve is arranged on the second pipeline, an exhaust pipe is fixed to the peripheral face of the third pipeline, and a third electromagnetic valve is arranged on the exhaust pipe. The helium mass spectrometer leak detector has the effects of reducing the pollution of the cavity of the helium mass spectrometer leak detector and improving the vacuum degree and the sensitivity of the mass spectrometer detection chamber.

The present invention provides a vacuum helium mass spectrometer leak detection method and device for bellows products, comprising the following steps: step S1, fixing the bellows with a support ring; step S2, assembling the support ring with a support plate; step S3, placing a first O-ring seal between the bellows and the upper cover, and fixing the upper cover, the bellows, and the support plate with studs; step S4, placing the fixed bellows on a base, placing a second O-ring seal between the base and the upper cover, and fixing them with bolts; step S5, placing the assembled bellows vertically, connecting a helium mass spectrometer leak detector to the bottom sampling port, and evacuating the outside of the bellows; step S6, connecting a helium cylinder connected to a pressure reducing valve to the top helium filling port, and filling the bellows with helium for leak rate testing. The present invention ensures that the bellows will not be stretched or distorted under stamping conditions; ensures the effectiveness of the seal between the bellows and the upper cover; and provides accurate and reliable test results.

1. The name of the design product: helium mass spectrometer leak detector. 2. The use of the design product: for sealed objects, leak point positioning and quantitative detection instrument. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective drawing.

The application provides a sealing detection method of an ultrahigh vacuum exhaust device, relates to the technical field of sealing detection, and comprises the following steps: performing leakage risk feature mining on the ultrahigh vacuum exhaust device, and constructing a detection point distribution; performing vacuum pumping smooth detection on the ultrahigh vacuum exhaust device, and generating a sealing detection starting signal according to a smooth detection result; performing sealing detection on the ultrahigh vacuum exhaust device according to the detection point distribution and a helium mass spectrometer leak detector, and obtaining a first device sealing detection result; and performing detection background interference correction, helium injection cross-influence compensation and material helium adsorption correction on the first device sealing detection result, and generating a fourth device sealing detection result. The application solves the technical problem that, due to the existence of various interference factors, misjudgment and omission are prone to occur, and the sealing detection precision is insufficient, the detection is performed after vacuum smoothing, the detection result is corrected, and the sealing detection effect of the ultrahigh vacuum exhaust device is improved.

This invention discloses a helium leak detection system and method for supercapacitors. The system includes a sealed leak detection chamber, a vacuum pumping unit, a helium supply and recovery unit, and a helium mass spectrometer leak detector. The hollow sealed leak detection chamber is used to hold the capacitor to be tested. The sealed leak detection chamber is connected to the vacuum pumping unit, the helium supply and recovery unit, and the helium mass spectrometer leak detector. The vacuum pumping unit is used to perform a vacuum pumping operation inside the sealed leak detection chamber. The helium supply and recovery unit is used to fill the sealed leak detection chamber with a mixture of helium and nitrogen gas, and to recover and store the helium in the mixture. The helium mass spectrometer leak detector is used to detect the change in helium concentration in the sealed leak detection chamber in real time and convert the detected helium concentration signal into leak rate data. This invention is scientifically designed, has high detection accuracy, and can accurately detect the sealing performance of capacitors, determine whether there is a leakage problem, improve detection efficiency, and reduce detection costs.

The application discloses a helium mass spectrum leak rate determination method fusing confidence quantification and finite state machine control and relates to the technical field of vacuum leak detection. The method comprises the following steps: S1, obtaining multi-dimensional features from a leak signal subjected to multi-frequency band filtering processing; S2, if a baseline signal and environmental interference features collected in the absence of helium gas meet corresponding preset conditions, respectively, determining a preset threshold value as an initial dynamic threshold value; S3, determining the weight of each feature in the multi-dimensional features by using an analytic hierarchy process and calculating the sub-confidence of each feature in the multi-dimensional features; S4, calculating the comprehensive confidence of the multi-dimensional features, and if the comprehensive confidence is not lower than a preset value, determining the helium mass spectrum leak rate by using the leak signal and the initial dynamic threshold value; and S5, dynamically updating the initial dynamic threshold value based on the comprehensive confidence, and repeatedly executing steps S1-S5 to continuously determine the helium mass spectrum leak rate. The method improves the determination reliability, the weak leak signal capturing capacity and the like.

The present invention discloses a rubber pad degassing component collection and analysis device and method. The device includes: a first rubber pad tooling fixture, a second rubber pad tooling fixture, a constant temperature water bath, a first sampler, a second sampler, a vacuum gauge, a liquid nitrogen bottle, a liquid nitrogen cold trap, a vacuum pump unit, and a helium mass spectrometer leak detector. After opening all the valves in the device, evacuating the air through the vacuum pump unit, and confirming that there is no leak point in the device through the helium mass spectrometer leak detector, measure the degassing components of the rubber pad inside the rubber pad tooling fixture; turn on the constant temperature water bath to heat the rubber pad tooling fixture; sample the degassing components of the rubber pad inside the rubber pad tooling fixture respectively through the sampler; remove the sampler and its corresponding valve, use a mass spectrometer to analyze the non-liquefiable gas in the sampler, disassemble the sampler and observe. If there is an oily component in the sampler, it is determined that the rubber pad will volatilize the oily component during the vacuum drying process.

The invention relates to the technical field of leak detection tools, in particular to a helium mass spectrometer leak detection tool for a pneumatic sealing connector, which comprises a base, a gas extraction channel, a pressure sensor, a pressure sensor and a pressure sensor, the base is provided with an accommodating groove, and one end of the gas extraction channel is communicated with the bottom wall of the accommodating groove; the supporting plate is connected with the base, and a pressing air cylinder is installed on the supporting plate; the sealing block is connected with a piston rod of the pressing air cylinder, an air supply channel is formed in the sealing block, one end of the air supply channel is connected with a helium input unit, and after the sealing block abuts against the base, an inner cavity of the containing groove communicates with the air supply channel; the gas extraction detection unit is connected with the base and is used for extracting gas in the gas extraction channel and detecting helium flowing into the gas extraction channel; according to the invention, the effect of reducing the detection error on the premise of improving the leakage detection efficiency of the connector is achieved.

This invention relates to the field of CFRP leakage detection technology, specifically to an in-situ CFRP leakage rate testing system under extreme thermo-coupling environments. The system comprises an extreme temperature environment simulation and mechanical loading subsystem, consisting of an environmental chamber and a mechanical loading unit; an in-situ helium mass spectrometry leakage detection subsystem, used to construct an independent helium chamber on one side of the sample; a molecular pump and a backing pump connected via stainless steel tubing on the other side of the sample; leakage detection using a helium mass spectrometer leak detector; and a multi-channel synchronous data acquisition and control subsystem, used for unified triggering of acquisition channels and software time correction; and for controlling environmental temperature, strain loading, real-time acquisition of leakage signals, and unified timeline display of multi-channel data. This invention improves the realism of environmental simulation, the continuity of detection, and the integrity of data correlation in CFRP leakage detection.

The invention relates to the related technical field of airtightness detection, in particular to a new energy automobile battery box body vacuum adsorption airtightness detection device which comprises a detection box body, a detection frame installed at the top of the detection box body, a battery box shell and a helium mass spectrometer leak detector. A detection plate arranged in the surrounding detection assembly reciprocates at the center of the top of the battery box shell, and a swing detection assembly is arranged at the position, at the sealing position of an upper cover and a lower cover of the battery box shell, of the interior of the detection frame. It is ensured that the fixed helium spraying gun always keeps the optimal constant distance from the top contour of the battery box shell, waveform swing can effectively cover the corner and the curved surface area of the battery box cover, efficient full-coverage detection of a complex sealing surface is achieved, the helium concentration coverage of the periphery of the battery box shell is uniform and stable by shifting an arc-shaped spiral blade in the scattering assembly, and the detection effect is improved.

This invention provides a fiber optic sealing joint leak detection device and its usage method. The device includes a helium mass spectrometer leak detector, a leak detection fixture bracket, and a helium spray gun. The leak detection fixture bracket has a leak detector connection end and a sealing joint mounting end. The leak detector connection end is connected to the gas inlet end of the helium mass spectrometer leak detector, and the sealing joint mounting end is configured to mate with the nozzle of the helium spray gun. The leak detector connection end has a first through hole extending into the leak detection fixture bracket, and the sealing joint mounting end has a second through hole extending into the leak detection fixture bracket. The first and second through holes are interconnected. The sealing joint mounting end has a sealing ring and a locking cap. The sealing ring has a sealing joint mounting hole for mounting the fiber optic sealing joint, and the locking cap has a gas inlet. The second through hole, the sealing joint mounting hole, and the gas inlet are sequentially arranged opposite each other. The locking cap is detachably mounted on the sealing joint mounting end. This method is applied to the device. This invention has a simple structure and can improve the detection efficiency of fiber optic sealing joints.

The invention discloses a method and a system for deducting a hydrogen background of a helium mass spectrometer leak detector, and belongs to the technical field of helium mass spectrometer leak detectors. The positive and negative bias voltages are applied to the original acceleration voltage, so that the maximum value and the minimum value of the hydrogen ion signal are obtained, and the background value of the hydrogen ion signal at the peak value of the helium ion signal when the bias voltage is not applied can be estimated through the maximum value and the minimum value of the hydrogen ion signal. And the total ion signal is deducted from the total ion signal when the bias voltage is not applied, so that the detection result of the helium ion signal is more accurate.

The present application relates to the technical field of leakage detection, and discloses a positive pressure suction gun leakage rate detection method, device, equipment, medium and product, comprising: obtaining a measured positive pressure standard leakage rate obtained by detecting a positive pressure standard leak hole by a helium mass spectrometer leak detector and a background leakage rate obtained by detecting ambient air; determining a correction coefficient of the helium mass spectrometer leak detector according to the measured positive pressure standard leakage rate, the background leakage rate and a standard leakage rate of the positive pressure standard leak hole; obtaining a measured leakage rate of a system to be detected, which is obtained by detecting the leakage rate of the system to be detected by the helium mass spectrometer leak detector; and calibrating the measured leakage rate by using the correction coefficient and the background leakage rate to obtain a calibrated leakage rate of the system to be detected. The present application obtains the correction coefficient of the helium mass spectrometer leak detector by obtaining the measured positive pressure standard leakage rate and the background leakage rate, and calibrates the measurement value of the system to be detected by the helium mass spectrometer leak detector according to the correction coefficient, so that the calibrated leakage rate of the system to be detected with quantitative judgment value is obtained.

The invention discloses a test device for a radial carbon ring sealing element, and belongs to the technical field of carbon ring sealing elements, the test device for the radial carbon ring sealing element comprises a helium mass spectrometer leak detector and a sealing cavity, the top of the helium mass spectrometer leak detector is provided with a leak detection opening, the sealing cavity is divided into a sealing tank and a sealing cover, the sealing cover is buckled on the sealing tank, and the leak detection opening is formed in the top of the helium mass spectrometer leak detector. A connecting port is formed in the bottom of the sealing tank, the connecting port is communicated with the leak detection port, and hoops are arranged outside the connecting port and the leak detection port; a servo motor is arranged above the sealing cover, and an adjusting indication mechanism used for adjusting the position of the servo motor is arranged on the side wall of the servo motor. According to the invention, the test mechanism capable of clamping and rotating the radial carbon ring sealing element is arranged in the sealing tank, and the adjustment indication mechanism which is convenient for a worker to master the opening degree of the test mechanism is arranged, so that the worker can better test the radial carbon ring sealing elements with different sizes; and the sealing performance is tested under the condition of simulating a working scene.