146 results about "Leakage rate" patented technology

The invention relates to the technical field of sealing performance testing, in particular to a breather valve performance online testing method for oil and gas storage and transportation, which comprises the following steps: acquiring a vibration signal of a breather valve body, a multi-band acoustic signal of a valve port and a total pressure signal in a storage tank; performing multi-scale complex wavelet decomposition, and constructing a time frequency-energy correlation feature tensor; the total pressure signal and the time frequency-energy correlation characteristic tensor serve as a combined observation value and are input into a preset continuous Gaussian mixture hidden Markov model containing four hidden states of sealing, transient micro-leakage, continuous leakage and full-amount opening, and the posterior probability is calculated; and calculating to obtain a real-time leakage rate. According to the method, the opening pressure can be accurately determined, the real-time leakage rate can be quantitatively calculated after the leakage state is recognized, comprehensive and accurate quantitative online evaluation of core performance parameters of the breather valve is achieved, and the multi-source information fusion degree and the anti-interference capacity are improved.

The invention provides a molecular air chamber leakage rate detection method, electronic equipment and a detection system, and the method comprises the steps: testing the spectrum data of a to-be-detected molecular air chamber; calculating the full width at half maximum of the wave spectrum data according to the wave spectrum data; and determining the leak rate of the molecular air chamber to be detected based on the full width at half maximum obtained at multiple times. According to the method, the degree of purity in the molecular air chamber cannot be affected under the condition that the leak rate detection precision of the molecular air chamber is better guaranteed.

The invention relates to the technical field of generator state monitoring, in particular to a leakage detection method and system for an ORC generator set, and the method comprises the steps: firstly, synchronously collecting system key operation parameters and environment concentration data; then, matching the pressure value with a pre-generated and load-divided leakage-free reference model, and calculating a theoretical pressure value and a real-time deviation; and a three-dimensional state judgment matrix is innovatively constructed and applied to perform combined logic judgment on a pressure deviation level and an environment concentration level, so that step-by-step diagnosis from micro-leakage early warning to serious leakage alarm is realized. After the leakage is confirmed, the leakage rate can be estimated, and the possible leakage area can be positioned in an assisted manner. According to the method, early-stage, sensitive, automatic and intelligent detection and diagnosis of leakage of the ORC generator set are realized, and the operation safety and the maintenance efficiency of the set are remarkably improved.

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 provides a universal assembling and testing method for a bipropellant attitude and orbit control liquid rocket engine. The assembling and testing method provided by the invention comprises 27 process steps, the method specifically comprises the steps of part collection, laser marking, cleaning, assembly assembling, strength testing, engine outer leakage rate detection, electrical performance detection, control valve inner leakage rate detection, mechanical testing, liquid flow testing, pore plate debugging, alcohol replacement, nitrogen purging, vacuum drying, purging, dew point testing, metering, assembling before warehousing, multimedia recording, engine final inspection and warehousing. Wherein the leakage rate detection and the electrical performance test are carried out for multiple times according to specific installation and test requirements. The attitude and orbit control engine assembling and testing method has the advantages that the assembling and testing effect of the attitude and orbit control engine is tested from multiple dimensions, generalization and standardization are achieved, and reliable work of the attitude and orbit control engine can be guaranteed.

The embodiment of the invention provides a liquid leakage detection method and system, a storage medium, an electronic device and a computer program product, and the method comprises the steps: obtaining an infrared image and space mapping information of at least one liquid-cooled cabinet, processing the infrared image through a pre-trained liquid leakage detection model, obtaining a segmentation mask of a leakage region and a non-leakage region, and obtaining the segmentation mask of the leakage region and the non-leakage region; and determining a central physical coordinate of the leakage area according to the segmentation mask, and determining a leakage position according to the space mapping information and the central physical coordinate. According to the technical scheme of the invention, the method can effectively solve the problems in the prior art that the plug-in box level leakage detection of a vertical liquid-cooled cabinet, especially the defects in the aspects of leakage source positioning and the like, achieves the effects of improving the detection precision and response speed under the condition of tiny leakage, and avoids the serious fault of a data center caused by liquid leakage. According to the embodiment of the invention, the leakage reason and the leakage rate can be identified by using deep learning, so that the response speed of operation and maintenance personnel is improved.

The invention discloses a low-temperature safety valve leakage detection device based on electrical capacitance tomography, which comprises a liquid nitrogen storage container, a test container, a low-temperature stop valve, a detected low-temperature safety valve, a constant-temperature water bath device, a flow meter, a water tank, a leakage detection pipeline, a capacitance measurement system and a data acquisition and software system, the capacitance measuring system comprises a plurality of groups of copper electrode plates and a processing module, each group of copper electrode plates comprises two copper electrode plates arranged on two opposite side parts of the water tank, and the copper electrode plates are used for capturing bubbles formed by the low-temperature gas in the cavity and acquiring capacitance signals; and the copper electrode plate is electrically connected with the data acquisition and software system through the lead electrode plate connector and the shielding coaxial cable. Insulation supports are arranged between the water tank and the copper electrode plates, the interior of the water tank is divided into a plurality of cavities, and communication gaps are formed between the adjacent cavities. The invention further discloses a low-temperature safety valve leakage detection method based on electrical capacitance tomography. According to the method, the accuracy and comprehensiveness of calculating the leakage rate of the low-temperature gas are improved.

The invention relates to a leak rate detection device and method based on a laser emission resonant cavity. The leak rate detection device comprises a resonant cavity; a laser transmitter; the conversion device is used for converting the photoacoustic signal into an electric signal; and the processing device converts the electrical signal into a leak rate Q. The leakage rate detection method comprises the following steps: setting an acousto-optic resonant frequency f of the resonant cavity; the wavelength of the laser emitted by the laser emitter is modulated, and the modulation frequency is the same as the acousto-optic resonance frequency f; controlling a laser transmitter to transmit modulated laser to an incidence window, and enabling the laser to irradiate the interior of the resonant cavity after passing through the incidence window; the characteristic gas absorbs the laser to generate vibration, and a photoacoustic signal is generated; collecting a photoacoustic signal by using a conversion device, and converting the photoacoustic signal into an electric signal; modulating the electric signal to obtain the oxygen concentration in the resonant cavity; and obtaining the leakage rate Q of the semiconductor cavity according to the oxygen concentration. According to the invention, the leakage condition of the semiconductor chamber can be accurately detected without shutdown.

The rotary four-way arbitrary intercommunication valve comprises a valve body and a valve element, and the valve element extends into the valve body and is in running fit with the valve body. And the valve core is used for switching the communication between any adjacent ports and the communication between the opposite ports every time the valve core rotates by 45 degrees in the valve body through the layered flow channel structure between 0 degree and 180 degrees. The four-way valve is composed of the valve body and the valve element, switching of any two-to-two communication among the four ports is flexibly controlled by rotating the angle of the valve element, mutual communication of the ports with specific flow direction combinations is supported, the function of dynamic random communication of the four ports is achieved, the sealing performance between the valve body and the valve element is improved, and the sealing performance of the valve body and the valve element is improved. The overall structural design is compact and simple, the characteristics of layered flow channels and high sealing performance are achieved, and the leakage rate is greatly reduced. The invention further discloses a rotating method for rotating the four-way arbitrary intercommunication valve.