41 results about "Pressure decay" patented technology

The invention relates to the technical field of measurement and testing, in particular to a leakage detection method and system for transformer oil tank production, and the method comprises the steps: dividing a to-be-detected oil tank into a plurality of test regions; determining an ideal net pressure attenuation rate by using the average pressure drop rate, the pressure change rate corresponding to the temperature change and the volume change amount of the oil tank cavity in the target time period in the target test area; determining a pressure attenuation deviation degree by using the ideal net pressure attenuation rate and the actually measured net pressure attenuation rate; determining an acoustic activity weight by using the acoustic activity degree of the acoustic signal in the acoustic event and the background noise average energy of the plurality of test areas in the acoustic event; and determining a regional leakage comprehensive index by using the acoustic activity weight and the pressure attenuation deviation degree, and further determining the leakage detection condition of the oil tank by using the regional leakage comprehensive index. According to the technical scheme, the accuracy and reliability of leakage detection are effectively improved, environment temperature interference is effectively eliminated, and background noise changes are dynamically adapted.

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

The application discloses a kind of mine roadway surrounding rock fissure rock mass bearing capacity detection equipment with drilling, and the application relates to the technical field of coal mine drilling survey, including drill rod, one end of the drill rod is provided with comprehensive drilling bit, water inlet pipe is arranged in the drill rod, and the water inlet pipe is used to supply water to the inside of comprehensive drilling bit, the inside of the drill rod is also provided with detection mechanism, the detection mechanism includes: pressure storage tank, one side of the pressure storage tank is fixedly connected with first connecting pipe, the first connecting pipe is fixedly connected with the output end of water pump at the end away from the pressure storage tank, the present application is provided with pressure detection module, flow rate detection module and high-frequency dynamic pressure sensing module, and combined with multi-parameter synchronous acquisition and coupling analysis, the pressure decay characteristic, flow change characteristic and transient pressure response characteristic can be obtained simultaneously, so as to construct surrounding rock fissure equivalent permeation response parameter, with the advantages of realizing the continuous acquisition of surrounding rock fissure permeation characteristic and its spatial distribution.

The present application relates to the field of measurement and testing, and relates to a kind of leakage detection method and system for transformer oil tank production, comprising: the oil tank to be measured is divided into multiple test areas;The pressure drop average rate of oil tank cavity in target time period, the pressure change rate corresponding to temperature change of target test area and the volume change amount are used to determine ideal net pressure decay rate;Ideal net pressure decay rate and measured net pressure decay rate are used to determine pressure decay deviation;The acoustic activity degree of acoustic signal in acoustic event and the background noise average energy of multiple test areas in the acoustic event are used to determine acoustic activity weight;Acoustic activity weight, pressure decay deviation are used to determine regional leakage comprehensive index, and then the leakage detection condition of oil tank is determined using regional leakage comprehensive index;The technical scheme of the present application effectively improves the accuracy and reliability of leakage detection, effectively eliminates environmental temperature interference and dynamically adapts to background noise change.

The application discloses a kind of gas insulated switchgear gas chamber pressure leakage degree judging method and system, applied to insulating switchgear gas chamber detection technical field, method includes first obtaining the pressure value of the gas chamber to be evaluated in preset time period, constructs pressure value sequence, and then the sequence is weighted average processing, obtains first final pressure value sequence, again to first final pressure value sequence Pressure mutation identification, locates pressure mutation interval and removes it, obtains second final pressure value sequence.Then, construct pressure state space model, input model to predict second final pressure value sequence, obtain optimal estimation pressure value sequence, calculate pressure decay rate according to optimal estimation pressure value sequence, and the pressure decay rate is segmented linear transformation, finally output gas chamber pressure leakage severity value.Through the above method, the accuracy of pressure leakage evaluation is effectively improved.

A method for determining properties of hydraulic fractures from measurements of pressure in a well made after stopping pumping fracturing fluid into the well (shut in) includes determining a first time after shut in whereinafter a decrease in measured pressure is caused by fluid leak off in a fracture. A second time after shut in is determined whereinafter the decrease in pressure is caused by fluid leak off, fracture growth and fluid pressure equilibration in the fracture. A third time after shut in is determined whereinafter the decrease in pressure is caused by fluid leak off, fracture growth, fluid pressure equilibration in the fracture and pressure drop in a near wellbore zone. Values of fluid efficiency, minimum stress and net pressure which are determined result in a calculated pressure with respect to time matching the pressure measurements within a predetermined threshold.

The application provides a dynamic measurement method and system based on parallel differential pressure analysis, and relates to the technical field of gas-liquid mass transfer measurement. The method adopts a measurement unit and a control unit in parallel, a first closed container of the measurement unit containing liquid and gas, and the initial volume of the gas phase in a second closed container of the control unit being the same as the volume of the gas in the first closed container. After the pressure of the two containers is synchronously and suddenly increased to the initial pressure P0 by synchronous pressure excitation, the system is closed, and the pressure decay curves P1(t) and P2(t) in the two containers are synchronously collected. After differential processing, the influence of system leakage is eliminated, and the net pressure decay curve ΔP(t) is obtained. Based on the ideal gas state equation, the change amount of the dissolved gas mass with time is inversed, and the dissolution kinetics data are obtained. The application can dynamically and accurately measure the gas dissolution process, effectively eliminates the leakage interference, and provides key dissolution kinetics data for gas-liquid mass transfer engineering.

The invention provides an equipment maintenance life detection method, and belongs to the technical field of artillery anti-recoil device detection, and the method comprises the steps: cleaning an anti-recoil device counter-recoil machine, connecting pressure, displacement and temperature detection assemblies, and building a detection reference coordinate system; the static air pressure and the dynamic air pressure attenuation rate are synchronously obtained, and at least three sets of data are collected every 5-30 s; the counter-recoil machine is controlled to complete multiple times of simulation of recoil / counter-recoil circulation, and the air pressure leakage rate, piston rod displacement and sealing face abrasion increment are detected; calculating a maintenance life residual value; when the threshold value is less than or equal to the preset threshold value, outputting maintenance early warning; according to the equipment maintenance life detection method provided by the invention, reliable detection of the equipment maintenance life residual value is realized by simulating recoil / counter-recoil cycle to restore the actual working state, synchronously capturing key parameters such as the air pressure leakage amount, the piston rod displacement amount and the sealing surface wear increment, and combining with the life calculation model.

A method of automating a pressure decay integrity test of a container configured for refrigeration by a transportation refrigeration unit (TRU) is provided. The method includes connecting a controller programmed with an automated pressure decay integrity test of the container to a compressor of the TRU and a pressure transducer installed in the container and executing the automated pressure decay integrity test by the controller. The executing includes activating the compressor to pressurize the container, receiving readings of the pressure transducer and determining, from the readings, whether the automated pressure decay integrity test is passed.

The invention relates to automatically performing a pressure attenuation integrity test of a controlled atmosphere of a refrigerated container, and particularly provides a method of automatically performing a pressure attenuation integrity test of a container configured to be refrigerated by a transport refrigeration unit (TRU). The method includes connecting a controller programmed with a pressure decay integrity test of the container to a compressor of the TRU and a pressure transducer mounted in the container, and performing the pressure decay integrity test by the controller. The performing includes: starting the compressor to pressurize the container; receiving the reading of the pressure transducer; and determining, from the readings, whether the pressure attenuation integrity test is passed.

The present application relates to the technical field of intelligent control and predictive maintenance of heating water heaters, in particular to a wind pressure switch control system for heating water heaters and a method thereof; the method collects time sequence pressure signals in the working cycle of the fan, extracts the starting pressure curve slope, steady state pressure fluctuation spectrum entropy and shutdown pressure decay time constant to generate a dynamic feature vector; the system compares the vector with a preset reference health vector, and real-time calculates the system health state confidence and state deviation drift rate; when the health confidence is lower than the safety threshold or the deviation drift rate is too fast, the system performs forced safety locking; if the health degree slightly decreases, the fan pre-blowing time is actively extended as compensation; the present application realizes the transition from fault response to predictive maintenance, can identify early performance degradation signs such as fan wear and air duct dust accumulation in advance, changes after-maintenance to pre-intervention, and effectively reduces the failure rate and maintenance cost.

This application provides an interactive method and system for detecting large leaks in energy storage air conditioners, relating to the field of energy storage air conditioner technology. This method significantly improves the convenience and consistency of large leak detection by integrating a full-process interactive interface that includes workpiece model selection, intelligent parameter configuration, one-click start, real-time multi-dimensional monitoring, and result visualization and backtracking. Users can quickly select the model and automatically load suitable flexible pressurization rules and gradient pressure relief programs, avoiding manual missetting. During the detection process, the current stage, pressure value, pressure-time curve, remaining pressure holding time, and acoustic emission status are dynamically displayed, allowing real-time monitoring of pressure resistance and structural safety, preventing damage to the workpiece structure during large leak detection. After completion, the judgment result is automatically displayed, linked to historical records, pressure decay rate, and alarm logs. It supports process curve playback and one-click generation of standardized test reports, greatly improving efficiency, traceability, and quality control.

The present disclosure relates to diagnosing and locating fluid leaks within a pneumatic system (5) using a minimum number of pressure sensors (55, 75, 89). Typically, each branch (51, 71, 85) of the pneumatic system (5) includes an associated pressure sensor (55, 75, 89), and depending on how the pneumatic components (57, 59, 61, 77, 91, 93, 95) associated with the pneumatic branch (51, 71, 85) are switched and monitored, a minimum number of pressure sensors (55, 75, 89) can be used to detect and locate leaks within the branch (51, 71, 85). More specifically, when the pneumatic components (57, 59, 61, 77, 91, 93, 95) are in a particular configuration, the pressure and pressure decay within the branch (51, 71, 85) can be measured by the sensors (55, 75, 89). Thereafter, the configuration is changed, and the pressure and pressure decay are again measured by the sensors (55, 75, 89). The results of these two measurements can enable the pneumatic system (5) to ascertain the existence and location of a leak.

The invention discloses a high-pressure hydrogen storage equipment leakage diffusion test method and device, a medium and equipment, and relates to the technical field of high-pressure hydrogen storage equipment safety. The method comprises the steps that in the leakage diffusion test process of the high-pressure hydrogen storage equipment, the leakage volume of hydrogen and pressure data of the hydrogen are collected, and the average pressure change rate of the hydrogen is calculated based on the pressure data; based on the average pressure change rate of the hydrogen, the leakage volume is corrected through a leakage volume correction formula, and the corrected leakage volume is obtained; the leakage volume correction formula is constructed according to the influence of quantitative hydrogen pressure attenuation on the leakage volume; and the corrected leakage volume is substituted into a leakage rate calculation formula for calculation, and the hydrogen leakage rate is obtained. The method improves the test precision of the leakage rate of the high-pressure hydrogen storage equipment.

Methods of diagnosing and detecting and locating leaks in a pneumatic system are provided. Pressurizing a first passage, the passage extending from the manifold through the valve to the first fitting; measuring a first pressure attenuation within the first channel based at least in part on a change in pressure within the first channel over a first period of time; pressurizing a second passage, the passage extending from the manifold through the valve to the second fitting; measuring a second pressure attenuation within the second channel based at least in part on a change in pressure within the second channel over a second time period; comparing the first and second pressure attenuations with a limit threshold; in response to determining that the first and second pressure attenuations are greater than a limit threshold, determining that there is a leak between the manifold and the valve; in response to determining that the first pressure attenuation is greater than the limit threshold and the second pressure attenuation is less than the limit threshold, determining that there is a leak between the valve and the first fitting; in response to determining that the first pressure attenuation is less than the limit threshold and the second pressure attenuation is greater than the limit threshold, it is determined that there is a leak between the valve and the second fitting.

The application provides an automatic door and window quality inspection method and system based on machine vision. In the process of pressure increase, a thermal image sequence and pressure data are synchronously collected, a heat conduction baseline is established in the low pressure stage, and a heat conduction mutation caused by deformation of a sealing structure is captured in the high pressure stage. Based on the geometric characteristics of the door and window, the thermal image data are dynamically registered to generate a displacement vector field, and an abnormal heat flow vortex and a discontinuous boundary are identified through a space-time feature extraction model. In the pressure decay stage, a dynamic data compensation mechanism is started to generate a tracking atlas, and finally, the phase correlation of the abnormal area is analyzed in combination with a three-dimensional seepage model, the air leakage path parameters are output, compared with a sealing failure threshold, and a partitioned sealing performance grading evaluation result is generated. The technical scheme provided by the application realizes precise positioning, three-dimensional seepage path reconstruction and quantitative leakage evaluation of non-contact door and window sealing defects through thermodynamic dynamic modeling and multi-source data fusion, and significantly improves the quality inspection accuracy and efficiency.

The present application relates to the technical field of automobile parts detection, in particular to a kind of automobile air conditioner compressor valve group air tightness detection method, comprising: acquisition is detected valve group multiple detection cycle in original air tightness detection data set collected by intelligent sensing system, data set includes pressure decay sequence, leakage acoustic wave sequence and mounting seat vibration sequence.Pressure decay sequence extracts pressure leakage feature vector, and acoustic fingerprint feature vector is obtained by analyzing leakage acoustic wave sequence.Improved nearest neighbor classification algorithm with feature dimension weighted distance measurement is used to determine sample similarity, two types of feature vectors are classified jointly, and leakage mode classification result is output.Air tightness detection conclusion is generated in combination with classification result and vibration sequence.The method can accurately determine the leakage condition of the valve group and locate the specific position of the leaking valve piece, improve the detection dimension and fault positioning accuracy, and adapt to the fine air tightness detection application of the valve group.

This invention discloses a vacuum furnace condition detection system based on pressure rise calculation, specifically relating to the field of industrial vacuum furnace sealing detection technology. It addresses the problem that existing methods, relying solely on single pressure change readings from bypass pipelines, cannot distinguish between the combined causes of valve internal leakage, pipeline venting, and external leakage, leading to uncertain fault location. This invention acquires the pressure time series of the bypass pipeline during the holding phase and the pressure decay time series after introducing a preset pressure gas. It constructs a decay phase trajectory and extracts the hysteresis loop envelope area as a decay dynamic feature. It also constructs a pressure rise phase trajectory and calculates the difference between its residence time percentage in each quadrant and that of the decay phase trajectory to obtain quadrant distribution asymmetry. This allows identification of whether the pressure change is dominated by valve internal leakage or pipeline venting. Furthermore, it assesses the internal leakage level for valve internal leakage and determines whether external leakage exists for pipeline venting, achieving the separation and quantification of the three causes: external leakage, internal leakage, and venting.

The application discloses an online detection and maintenance method for a hydraulic system of an underground trackless equipment, and belongs to the technical field of fault diagnosis of underground trackless equipment. When a vehicle meets a quasi-static boundary condition, the hydraulic circuit is locked and the integrity of the reference circuit is checked; a bistable test signal containing dynamic pressure building and static pressure maintaining is synchronously sent to the to-be-detected hydraulic circuit and the reference hydraulic circuit; the effective bulk modulus of the fluid is inversed by using the dynamic response of the reference hydraulic circuit, and the flow supply efficiency is calculated; the internal leakage flow in the to-be-detected hydraulic circuit is calculated by combining the inversed modulus and the static pressure decay data; finally, the fault type is determined and the control parameter is corrected according to the internal leakage flow and the flow supply efficiency. The application eliminates the influence of the change of oil characteristics on the detection accuracy, and realizes independent identification and closed-loop compensation of the faults of the control valve and the executing element.

The invention discloses an unmanned aerial vehicle-based airborne pump set type foam fire extinguishing device, and relates to the technical field of fire extinguishing equipment, the unmanned aerial vehicle-based airborne pump set type foam fire extinguishing device comprises an unmanned aerial vehicle main body, a pump set liquid supply mechanism is fixedly arranged in the middle of the unmanned aerial vehicle main body, a support is arranged below the unmanned aerial vehicle main body, and a gas-liquid mixing foaming assembly is placed at the top end of the support; a spraying gun is fixedly arranged on one side of the gas-liquid mixing foaming assembly, two supporting blocks are symmetrically and fixedly arranged on the surface of the support, and pressing plates are rotationally arranged in the supporting blocks. The device has the beneficial effects that an independent electric pump set constant-pressure liquid supply mode is adopted, closed-loop precise regulation and control are achieved in cooperation with an onboard electric control module, constant-pressure and constant-flow conveying of a fire extinguishing agent is kept in the whole process, and the hidden danger of pressure attenuation is thoroughly eliminated; no matter for low-altitude fire extinguishing operation or high-rise precise fire extinguishing operation, the spraying distance and flow are always stable and controllable, the fire point covering precision is greatly improved, and the fire extinguishing stability is fundamentally guaranteed.

The invention relates to the technical field of production of high-heat-dissipation 1.6 T optical module shells, in particular to a die-casting method and die for a high-heat-dissipation 1.6 T optical module shell. According to the method, the heat sink piece with the reactive middle layer is pre-arranged in the preheating mold cavity, the multi-stage vacuum environment is established to inject the melt, and the porosity is reduced through vacuum exhaust; in the solidification process, multi-stage static pressurization with the middle stage larger than the initial stage is applied, and shrinkage porosity of a chilling area is eliminated through high-pressure feeding; and in combination with self-adaptive closed-loop adjustment, the cavity pressure attenuation rate and the heat sink interface temperature are monitored in real time, and the pressurization strategy and the mold filling speed are dynamically adjusted. Metallurgical bonding of the heat sink piece and the base body and active inhibition of solidification defects are achieved, and the heat dissipation efficiency and the air tightness yield of the 1.6 T optical module shell are remarkably improved. The problems that an existing optical module shell is large in interface thermal resistance due to mismatching of thermal expansion coefficients, and the chilling effect of a heat sink piece easily causes the shrinkage cavity defect are solved.

The invention relates to the technical field of fire extinguishers, and particularly discloses a fire extinguisher with a pressure compensation function. The fire extinguisher comprises a fire extinguisher body, a main pressure compensation unit and an auxiliary pressure compensation mechanism. The fire extinguisher body is provided with a main runner for storing and conveying fire extinguishing agents. The main pressure compensation unit comprises a pressure relief mechanism and a high-pressure gas cylinder, and the pressure relief mechanism automatically controls gas release of the high-pressure gas cylinder according to the internal pressure of the fire extinguisher body so as to achieve pressure compensation. The auxiliary pressure compensation mechanism is installed on the main flow channel and provided with an adjusting piston capable of axially moving, and a conical adjusting part of the adjusting piston changes the flow area of the main flow channel in response to pressure changes, so that the flowing state of the fire extinguishing agent is adjusted. The main pressure compensation unit and the auxiliary pressure compensation mechanism work cooperatively based on the same pressure change signal, pressure stability in the fire extinguisher body and fire extinguishing agent conveying constancy are maintained jointly through gas release and flow area adjustment, and the problem that the fire extinguishing efficiency is reduced due to pressure attenuation of a traditional fire extinguisher is effectively solved.

The application relates to the technical field of intelligent garbage collection management, and discloses a garbage overflow detection and sound-light alarm scheduling method based on a pressure sensor. The method collects a pressure decay observation sequence after each disposal event, separates a seepage liquid component through a double exponential decay model fitting, extracts a residual pressure component as an effective solid mass pressure contribution value, compares the value with an overflow threshold value after accumulation to drive sound-light alarm; meanwhile, a date attribute template is constructed based on a historical effective solid accumulation rate, an overflow time is predicted, a pre-deployment cleaning and transportation scheduling scheme is generated, the rate template is dynamically corrected according to a real-time water content rate offset during operation, and the template is iteratively updated after the end of each day.

A seal integrity verification system and an electronic power steering system are disclosed. The seal integrity verification system includes a pressure source, a valve, a pressure sensor, a power assist mechanism, and a control unit. The control unit is programmed to, in response to a request to verify the integrity of at least one sealing member, command the valve to move toward a first open position, command the pressure source to operate, and the pressure sensor is arranged to provide a second signal indicating pressure decay within the housing assembly. The pressure source is arranged to supply positive pressure fluid to the housing assembly. The control unit is also programmed to, in response to the second signal indicating that the pressure decay is greater than a threshold, output a warning; command the compressor to operate to supply fluid to the housing assembly; and, in response to a first signal and at least one command for a predetermined time period to stop the compressor, command the valve to move toward a closed position; command the valve to move toward the first open position to discharge fluid; and command the valve to move toward a second open position.

This invention is a robust pressure testing system designed for harsh environments with minimal user interaction and easy maintenance. It utilizes standardized electromechanical components and relay logic, avoiding custom elements to ensure long-term reliability and reduce obsolescence. The system operates at 24 VDC and accepts AC, internal battery, or external DC power, with overcurrent protection provided by fuses and breakers. It can pressurize and evacuate test volumes to user-specified levels, monitoring for leaks through pressure decay. The pneumatic system generates positive and negative pressures, controlled by electrically actuated valves, with filters and dryers preventing contamination. The instrumentation includes a pressure transducer and process timer for precise measurements, enhancing usability and adaptability in varied environments. Modular components and self-diagnostic features further improve system performance and compatibility.

This invention discloses a high-speed bottle-kicking system and its control method for a glass bottle inspection machine, belonging to the field of glass bottle inspection technology. Addressing the problem of missed rejections and bottle bursts caused by pressure decay during high-speed continuous operation in existing bottle-kicking devices, this invention proposes a three-section variable-diameter bottle-kicking tube, which includes an expansion acceleration section connected in parallel to a gas storage tank with a throttling valve and a pressure sensor. The controller pre-charges the gas storage tank with gas before the bottle-kicking valve opens, based on the kicking frequency and real-time pressure, and releases high-pressure gas at the moment of kicking to dynamically compensate for the pressure drop. This invention effectively eliminates the pressure decay phenomenon during continuous bottle kicking, significantly improves the success rate of high-speed bottle kicking, reduces energy consumption and the risk of bursts, and exhibits high stability and adaptability.

The utility model relates to the technical field of workpiece surface cleaning devices, in particular to a pulse type foreign matter removing and workpiece surface cleaning device which comprises a main flow guide pipe, an extension pipe, a spray head, a base, a pressurizing pipe and a pressurizing mechanism, the extension pipe is arranged at one end of the main flow guide pipe, the spray head is connected to one end of the extension pipe, and the base is arranged on one side of the main flow guide pipe. According to the utility model, the pressurizing mechanism is arranged, so that the spray head can generate high-pressure pulse, and the surface of a workpiece can be quickly cleaned; meanwhile, by means of the arrangement of a force unloading unit, after the air pressure in the device reaches a preset value, a first driven rod and a second driven rod can be synchronously linked, then a linkage ring and a butt joint base can rotate, it is avoided that the butt joint base is pushed again to move, and then the force unloading effect is achieved; high-pressure gas can be continuously output, the situation of gas pressure attenuation is avoided, and the cleaning efficiency is effectively guaranteed.

The application relates to the technical field of hydraulic systems, and discloses a hydraulic control system and a working machine. In the hydraulic control system, an oil source is connected with an accumulator group through a liquid charging one-way valve. The accumulator group is connected with a brake unit. A pressure feedback control oil port is arranged on a liquid charging control valve group. The liquid charging control valve group can control the communication state of the liquid charging one-way valve and the oil source based on the pressure value of the pressure feedback control oil port. One end of a throttling element is connected with the accumulator group. The other end of the throttling element is connected with the liquid charging one-way valve and the pressure feedback control oil port. Through the structural arrangement, the pressure decay rate of the accumulator group fed back to the pressure feedback control oil port is reduced under the throttling action of the throttling element. Therefore, the starting frequency of the liquid charging valve can be reduced, energy waste can be reduced, the liquid charging valve can be effectively protected, and the service life of the liquid charging valve can be prolonged.