13 results about "Continuous leakage" patented technology

The invention discloses a natural gas long-distance pipeline safety pressure test device, which belongs to the technical field of pipeline pressure test, and comprises a pipeline structure and four bolt connection pairs I. The outer surface of the pipeline structure is provided with two monitoring structures, and the two monitoring structures are fixedly connected through the four bolt connection pairs. The piezoelectric trigger is arranged on the flange connecting disc and matched with the monitoring structure to monitor whether connection of the flange connecting disc is tight or not in real time; through the cooperation of the water-soluble connecting strip and the pre-tensioning assembly, in the initial stage of pipeline leakage, the water-soluble connecting strip is dissolved to trigger the change of the form of the pre-warning light strip, and by means of the obvious change from intermittent light to continuous light, workers can timely find out the loosening and water seepage phenomena of the flange, timely maintenance is facilitated, the overload hidden danger caused by continuous leakage is avoided, and the working efficiency is improved. Compared with traditional manual inspection, the timeliness and accuracy of abnormity discovery can be greatly improved, and the pipeline overload phenomenon is effectively avoided.

The invention discloses a method and equipment for testing a continuous leakage current limit value of a photovoltaic integrated low-voltage direct-current power supply system, and the calculation of the continuous leakage current limit value of the photovoltaic integrated low-voltage direct-current power supply system is based on the photovoltaic installed capacity and permeability, so that the photovoltaic permeability in the photovoltaic integrated low-voltage direct-current power supply system is firstly calculated; according to the method, a continuous leakage current limit value is determined, and then the turn-off time of the interrupt protection equipment is recorded through the step of adjusting test circuit element parameters, so that the final continuous leakage current limit value is obtained. According to the method, the response timeliness of the interruption protection equipment to the continuous leakage current out-of-limit can be ensured in the test process, and the safe operation of the photovoltaic integrated low-voltage direct-current power supply system is ensured.

The invention relates to a pipeline leakage detection method, in particular to a pipeline leakage detection method based on deep learning. The method comprises the following steps: acquiring a pipeline inspection video; capturing a leakage target; comparing the current frame and the historical frame of the leakage target; capturing the change and spatial position of the leakage target in the time dimension, and carrying out feature fusion; carrying out modeling and motion trail prediction on the motion trail of the leakage target; performing feature enhancement on the leakage target after the motion trail prediction to obtain enhanced features; and carrying out detection head monitoring on the enhanced features, and outputting the leakage probability. According to the invention, a temporarily appearing false target and continuously existing real leakage can be intelligently distinguished, the space-time fusion detection mechanism significantly improves the anti-interference capability of the system, and the problem that the transient noise is sensitive and the continuous leakage is slow in the prior art is solved.

The invention provides a PWM module design circuit for reducing dead time and a working method thereof, and belongs to the technical field of analog integrated circuits. Through cooperative work of the first lifting path and the second lifting path, the voltage of the VSUM node is quickly lifted at the voltage rising edge of the SW node. Therefore, the PWM comparator can make a response more quickly, output signals are overturned, and dead time which must be set for preventing straight-through of an upper power tube and a lower power tube is greatly shortened. The reduction of the dead time means that the effective conduction time of the power tube is increased, so that the switching loss is reduced, and the conversion efficiency of the whole power supply system is improved. And by delaying to start a time sequence control strategy of the M6, the dual-path automatic management is creatively realized. In the key initial stage of SW rising, M6 is not started; when the SW is stable, the M6 is turned on, the VSUM voltage is boosted to the state that the SW voltage is smaller than the breakover voltage of the body diode, the second boosted path is automatically cut off, and continuous electric leakage or invalid power consumption through the body diode in a steady state is avoided.

The invention provides a separation device leakage early-stage detection method and system based on an acoustic emission technology, and relates to the technical field of radioactive substance leakage detection.The method comprises the steps that acoustic emission sensors are arranged on the outer wall of a separation device to form a monitoring unit, acoustic emission signals are synchronously collected, and grouping processing is conducted according to a preset time window; performing circumferential arrangement on the signal energy values of different monitoring units, calculating an energy attenuation gradient, constructing a circumferential energy distribution sequence, and comparing energy distribution characteristics in a continuous time window to identify a stable acoustic emission propagation path; calculating a propagation velocity consistency parameter according to the installation distance between the monitoring units on the propagation path and the signal arrival time difference, and determining that a continuous leakage sound source exists when a preset propagation velocity stability condition is met; and the leakage position is determined by combining the position of the signal energy maximum monitoring unit and the propagation time difference, and the leakage early warning information of the corresponding area is output, so that the tiny leakage of the separation device is identified and positioned.

The utility model discloses a gas pipeline leakproof sealing device, which belongs to the technical field of gas pipeline leakproof sealing devices, and adopts the technical scheme that the gas pipeline leakproof sealing device comprises a first gas pipe, the right side of the first gas pipe is communicated with a first electronic valve body, and the right side of the first electronic valve body is communicated with a second gas pipe; a first protective cover and a second protective cover are arranged on the surface of the first gas pipe and the surface of the second gas pipe respectively, and supporting assemblies are fixedly connected to the bottoms of the first protective cover and the second protective cover. A maintainer may need a certain time to arrive at a leakage position to cause continuous leakage of fuel gas, although the maintainer has a protective shell, the storage effect is poorer, and when a user needs to maintain, the protective shell needs to be opened, so that the fuel gas in the protective shell leaks, and unnecessary troubles are caused.

The invention provides a multi-scale three-dimensional leakage channel model construction method and device and a medium, and relates to the technical field of fluid isolation and sealing. The method aims at solving the problem that a real and multi-scale three-dimensional leakage channel geometric model formed by contact of two rough surfaces cannot be accurately and efficiently solved in the prior art. The method comprises the following steps: executing a multi-scale contact analysis step: adaptively adjusting scale details of surface topography for calculation according to a local deformation degree of a surface so as to calculate contact deformation; a real gap reconstruction step is executed, and the real geometrical morphology of the three-dimensional non-contact gap between the two rough surfaces is determined based on the contact deformation; and executing a three-dimensional channel searching step, and searching a continuous leakage channel from the inlet to the outlet in the three-dimensional non-contact gap according to a preset communication rule. According to the method, the solution precision is improved through real gap reconstruction and three-dimensional channel search, the calculation efficiency is improved through multi-scale contact analysis, and a set of complete, efficient and accurate numerical solution process is provided.

The invention discloses a connector liquid leakage detection device, and relates to the technical field of liquid leakage detection, the device comprises a first clamping piece and a second clamping piece, the first clamping piece is provided with a first detection port and a second detection port which are in an annular array and are distributed in a staggered manner, and the first clamping piece is internally provided with a liquid leakage detection piece for liquid leakage detection; a drainage assembly is further arranged on the first clamping piece, and a hydraulic detection piece used for detecting hydraulic changes is further arranged on the inner side of the first clamping piece. The liquid infiltration mode is recognized through the detection ports distributed in the staggered layers, the control unit intelligently distinguishes condensate water, continuous leakage and accumulative tiny leakage in combination with hydraulic change historical data and real-time signals, interference can be actively eliminated through the drainage assembly, and the leakage detection efficiency is improved. And intermittent tiny leakage which is easy to neglect can be accurately judged and pre-warned, so that the intermittent tiny leakage and condensed water dew in a humid environment are effectively distinguished, and the accuracy and the reliability of leakage detection of the hydraulic joint in a complex industrial environment are remarkably improved.

This invention relates to the field of sealing performance testing technology, specifically an online performance testing method for breather valves used in oil and gas storage and transportation. The method includes: acquiring vibration signals from the breather valve body, multi-band acoustic signals from the valve port, and total pressure signals within the storage tank; performing multi-scale complex wavelet decomposition to construct a time-frequency-energy correlation feature tensor; inputting the total pressure signal and the time-frequency-energy correlation feature tensor as combined observations into a preset continuous Gaussian mixture hidden Markov model containing four hidden states: sealed, transient micro-leakage, continuous leakage, and full opening, to calculate the posterior probability; and then calculating the real-time leakage rate. This invention not only accurately determines the opening pressure but also quantitatively calculates the real-time leakage rate after identifying the leakage state, achieving a comprehensive, accurate, and quantitative online evaluation of the core performance parameters of the breather valve, and improving the degree of multi-source information fusion and anti-interference capability.

The invention discloses a pipeline leakage real-time monitoring system, method and equipment and a medium, and belongs to the technical field of pipeline monitoring. The system comprises a double-pressure wave sensor module used for collecting pressure wave signals of a pipeline, and the pressure wave signals comprise transient negative pressure waves in the initial leakage stage of the pipeline and steady-state pressure waves in the continuous leakage stage of the pipeline; the signal processing module is used for processing the transient negative pressure waves and the steady-state pressure waves and extracting leakage parameter characteristics through time-frequency analysis; the data processing module is used for calculating the position of a leakage point by utilizing a time delay estimation method according to the leakage parameter characteristics; and the alarm communication module is used for sending out a leakage alarm signal when leakage is confirmed, and uploading the leakage point position and the monitoring data to a cloud end. The technical problem that pipeline leakage monitoring and positioning are not accurate is solved.

The application discloses a kind of electromagnetic heating device handheld end leakage detection early warning system, specifically relates to leakage detection and early warning field, including: acquisition module is used to collect pressure value, flow value, wet value and heating state value according to sampling time, and write in detection record;Unloading module is used to keep cooling passage conduction when heating state value changes from opening to closing, and closes cooling passage at the end of conduction, to write in unloading record;Sequence module is used to read the closing time of heating state value from opening to closing in detection record. By keeping cooling passage conduction after closing time and extracting final state sequence and recovery sequence, the cooling recovery process after stopping heating can be developed separately, whereby the stable closed failure state when continuous leakage has not yet formed is detected, and the early instability recognition capability is relatively improved.

The invention relates to the technical field of liquid leakage monitoring, in particular to a liquid leakage monitoring and trend early warning method, system and device and a storage medium. The method comprises the following steps: collecting an acoustic signal and a vibration signal generated by leakage dripping, carrying out filtering processing on the signals, then identifying peak points, and calculating a time interval between adjacent peak points to obtain dripping interval characteristics; the liquid leakage state is judged according to the continuity of the dripping interval characteristics, and the intermittent dripping state and the continuous leakage state are distinguished; in the intermittent dripping state, a high-quality signal source is selected by evaluating the signal-to-noise ratio of an acoustic signal and a vibration signal, and the leakage speed evolution trend is calculated based on dripping interval characteristic changes; in the continuous leakage state, liquid level data of the liquid container are obtained, and the leakage speed evolution trend is calculated based on the change rate of the liquid level data along with time; and performing threshold judgment on the leakage velocity evolution trend, and outputting an early warning signal when the leakage velocity evolution trend exceeds an early warning threshold.

The application provides a leakage early detection method and system based on acoustic emission technology for a separation device, relates to the technical field of radioactive substance leakage detection, and comprises the following steps: arranging acoustic emission sensors on the outer wall of the separation device to form a monitoring unit, synchronously collecting acoustic emission signals, and grouping processing according to a preset time window; arranging the signal energy values of different monitoring units in a circumferential direction and calculating an energy attenuation gradient to construct a circumferential energy distribution sequence, and comparing the energy distribution characteristics in continuous time windows to identify a stable acoustic emission propagation path; calculating a propagation speed consistency parameter according to the installation distance between the monitoring units on the propagation path and the signal arrival time difference, determining that there is a continuous leakage sound source when a preset propagation speed stability condition is met; determining a leakage position in combination with the position of the signal energy maximum monitoring unit and the propagation time difference, and outputting leakage early warning information of the corresponding area, so that the identification and positioning of the small leakage of the separation device are realized.