24 results about "Continuous leakage" 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 method and device for monitoring gas release of a battery pack, and the method comprises the following steps: a to-be-detected battery pack is placed in a high-pressure or low-pressure airtight cabin, and the pressure intensity of the high-pressure or low-pressure airtight cabin is the external pressure intensity of the battery pack in actual use. A piezoelectric excitation piece is attached to the high-pressure or low-pressure airtight cabin, the airtight cabin is subjected to frequency sweeping excitation to obtain the initial frequency f0 of the standing high-pressure or low-pressure airtight cabin, and the initial quality factor Q (0) is calculated. And continuously starting the piezoelectric excitation sheet by taking each second as a period to obtain a real-time frequency f (t) of the airtight cabin, and calculating a real-time quality factor Q (t) of the airtight cabin based on the initial frequency f0 and the real-time frequency f (t). And obtaining a threshold value A of a quality factor between electrolyte decomposition and diaphragm decomposition of the battery pack according to the capacity and the type of the battery pack and the volume of the airtight cabin. And comparing the real-time quality factor Q (t) with a threshold value A, and if Q (t) is less than A, stopping the pressurization or negative pressure device. Through the method, the explosion risk caused by continuous leakage of the battery pack is prevented.

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 utility model relates to a leakage current testing device for an inverter. The input end of the device is connected with the direct current input end of the inverter, the output end of the device is grounded, and the device comprises a resistance adjusting circuit, a capacitance adjusting circuit, a plurality of resistance circuits connected in parallel and a switch module. And the switch module is connected with the resistance adjusting circuit and the plurality of resistance circuits which are connected in parallel, and controls the resistance adjusting circuit and at least one of the resistance circuits to access to form a continuous leakage current test loop. The switch module is connected with the capacitance adjusting circuit, and controls the access of the capacitance adjusting circuit to form a leakage current threshold adjusting loop. And the switch module controls the access of at least one resistor circuit in the plurality of resistor circuits connected in parallel based on a leakage current threshold value to form a sudden rise leakage current test loop. The device is simple in loop and convenient to operate, can quickly adjust the magnitude of the leakage current, and realizes high-precision inverter leakage protection test.

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 application discloses a kind of overloadable monitoring control devices of alarm, belong to pipeline overload monitoring technical field, including pipeline structure and four bolt connection pairs one, the outer surface of pipeline structure is equipped with two monitoring structures, two monitoring structures are fixedly connected by four bolt connection pairs one, the present application is by being provided with piezoelectric trigger on flange connecting disc, with monitoring structure cooperation can real-time monitoring whether the connection of flange connecting disc is tight;Through the cooperation of water-soluble connecting strip and alarm piece, in the early stage of pipeline leakage, connecting strip dissolves and triggers alarm piece to emit sound, cooperate sound monitoring sensor and its integrated wireless transmission module send alarm to monitoring terminal, so that staff can timely find that flange appears loose and seepage phenomenon, it is convenient to repair in time, to avoid the overload hidden danger caused by continuous leakage, compared with traditional manual inspection, can greatly improve the timeliness and accuracy of abnormal discovery, effectively avoid the emergence of pipeline overload phenomenon.

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 application discloses a kind of multi-mode constant pressure gas storage experimental equivalent simulation methods, containing leakage characteristic evaluation process, specifically: the closed loop sensitivity of system is spectrum shaping, and constructs sensitivity notch in target perturbation frequency band;Generate the perturbation signal satisfying mass-enthalpy-time first moment triple constraint, and after its anti-resonance spectrum pre-shaping, inject in notch frequency band, to obtain the system response data of high signal-to-noise ratio;Online estimation of structured leakage is carried out using mode-aware instrumental variable method, and the continuity of cross-mode estimation is guaranteed through bridging consistency mechanism.The application can obtain unbiased, continuous leakage estimate, and provides effective tool for accurate evaluation of constant pressure energy storage system.

The utility model relates to a switching system for controlling refrigerant leakage and air conditioning equipment. An inlet valve and an outlet valve for core components of first and second roof unit systems of the dual roof unit system are configured to open when both the core components operate normally. The switching system includes a plurality of switching bypasses communicating the fluid circuits of the first and second roof unit systems and provided with corresponding switching valves. The switching system is configured in the mode that when at least one of the core components breaks down, the broken-down core component is forbidden by closing the associated inlet valve and outlet valve so as to avoid continuous leakage of the refrigerant, and the corresponding switching valves in the multiple switching bypasses are selectively opened so as to communicate fluid loops of the first roof unit system and the second roof unit system. Therefore, the core part which does not fail is allowed to be shared for continuous operation, and the influence of maintenance operation is avoided. In this way, all parts of the first roof unit system and the second roof unit system can fully play the role, and it is ensured that the air conditioner equipment can still work normally.

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 present application discloses a fast version of an analog leakage current sensor and its use method. The sensor includes: an open-loop magnetic core module, including a single set of oscillation coils; an AC / DC composite detection module, integrated at the sensing end of the open-loop magnetic core module, including a DC leakage current detection unit, an AC leakage current detection unit, and a dual-channel switch detection interface; a control module, which performs real-time baseline tracking and compensation for DC leakage current and AC leakage current based on a sliding time window; dynamically adjusts the digital filter parameters corresponding to DC leakage current and AC leakage current according to the ambient electromagnetic noise spectrum; performs timestamp alignment on the DC leakage current, AC leakage current, and the switch signals corresponding to the dual-channel switch detection interface; outputs leakage detection results based on the DC leakage current, AC leakage current, and switch signals; including normal operating conditions, transient leakage, and continuous leakage. The sensor function can be realized through a single set of oscillation coils, eliminating the secondary winding and shortening the production process.

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 provides a high-temperature and high-pressure steam safety valve leakage detection method and system, and relates to the technical field of industrial equipment state monitoring. Suppression processing of a first processing path is carried out on original acoustic information to generate target acoustic information, and the state of a valve is reported; and performing point-by-point subtraction on the original acoustic information and the target acoustic information through the second processing path to generate residual acoustic information. The differential processing can effectively strip real and weak continuous leakage signals which may be weakened together by a conventional noise suppression strategy. And then, analyzing the residual acoustic information, and judging whether continuous acoustic information meeting a preset duration threshold and a preset energy threshold exists or not, thereby accurately identifying a real leakage signal. And if the continuous real leakage signal exists, an early warning record is triggered.

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 unmanned detection vehicle comprises a bottom plate, a solar photovoltaic power generation set is arranged on one side of the top of the bottom plate, a storage battery is arranged on one side of the solar photovoltaic power generation set, and a crawler belt driving mechanism is arranged at the bottom of the interior of the bottom plate; according to the utility model, under the cooperation of the base plate, the crawler belt driving mechanism, the crawler belt, the camera group, the first gas concentration detection device, the GPS positioning device, the connecting vertical plate and the WiFi signal transmission mechanism, the device can inspect along the route of the pipeline in the natural gas pipeline inspection process; when the natural gas concentration of a section of route changes, data can be detected in time, the situation that natural gas continuously leaks is avoided, the leakage position can be positioned, and the flatness image of the ground can be compared in the inspection process, so that the situation that the natural gas pipeline is excavated by other construction teams is avoided.

The utility model relates to an electronic gas steel cylinder valve capable of stopping leakage emergently, which comprises a valve body, a valve cavity is arranged in the middle of the valve body, a gas inlet and outlet communicated with the valve cavity is arranged on the side portion of the valve body, a gas channel communicated with the valve cavity is arranged at the lower end of the valve body, and a valve core for controlling the gas inlet and outlet and the inlet and outlet channel to be connected and disconnected is arranged in the valve cavity. A leakage stopping threaded hole communicated with the gas channel is further formed in the side portion of the valve body, and a screwed plug is arranged in the leakage stopping threaded hole. The electronic gas steel cylinder valve capable of stopping leakage emergently is simple in structure, reasonable in design, convenient and practical, has the function of stopping leakage emergently, when leakage occurs, the screwed plug can be quickly screwed in to cut off a gas channel, it is guaranteed that toxic gas does not leak any more, and safety and reliability are achieved; the problem of continuous leakage in the process of transferring a leaked steel cylinder to a steel cylinder coffin 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.

The invention relates to the technical field of malicious software detection, in particular to a privacy information protection method based on an intelligent medical electronic seal, which comprises the following steps of: collecting operation records and behavior data of the electronic seal, and generating a behavior data set; according to the method, the operation record and behavior data of the electronic seal are collected to generate the behavior data set, and then behavior feature extraction is carried out, including key information such as access frequency and operation time period. The extracted behavior characteristics are finely analyzed through a decision tree algorithm, the deviation between the extracted behavior characteristics and a normal behavior mode is rapidly and clearly determined, abnormal behavior indexes are screened, and a solid foundation is provided for follow-up accurate identification of malicious activities. On the basis, the random forest algorithm is used for further analyzing the screened abnormal indexes, the potential malicious activities are quickly positioned, then the process isolation action is immediately executed, the malicious processes possibly threatening privacy security are suspended and isolated in time, and the risk of continuous leakage of sensitive data is effectively avoided.