217 results about "Internal pressure" patented technology

The invention relates to the technical field of pumped storage power station water diversion systems, and discloses a method and device for determining a pressure pipeline reinforcement ultra-high performance concrete lining structure. The method comprises the steps that internal pressure information, radius information and lining thickness information of a target water channel, the design tensile strength of a tensile steel bar, the tensile stress borne by ultra-high performance concrete and the lining section area per unit length are obtained; calculating circumferential stress information of the target water channel based on the internal pressure information and the radius information; based on the circumferential stress information and the lining thickness information, the tensile force resultant force of the lining section in unit length is determined; determining the total sectional area of the tensile steel bars based on the tensile resultant force of the section of the lining in unit length, the designed tensile strength of the tensile steel bars, the tensile stress of the ultra-high performance concrete and the section area of the lining in unit length; determining the number of to-be-assembled reinforcements based on the total sectional area of the tensile reinforcements; and the pressure pipeline reinforcement ultra-high performance concrete lining structure is determined based on the number of the to-be-assembled steel bars and a preset steel bar arrangement rule.

Even if the cap is removed from the mouth of the container while the internal pressure of the container body has increased, the contents will not spray out through the connecting passage. [Solution] The container comprises a container body 11 for containing the liquid contents, a cylindrical stopper member 12 attached to the mouth 11a of the container body, and an impregnating material 13 attached to the inside of the stopper member and capable of impregnating the liquid contents. The stopper member comprises a containment cylinder 15 for containing the impregnating material with its upper end protruding, and a communication cylinder 16 that connects the inside of the containment cylinder and the inside of the container body. A communication passage 21 is provided between the containment cylinder and the impregnating material, connecting the inside of the communication cylinder and the upper end opening 15b of the containment cylinder. The communication cylinder has a main passage 22 that connects the communication passage and the inside of the container body, and a capillary passage 23 that connects the communication passage and the inside of the container body, and has a smaller flow path cross-sectional area than the main passage, causing capillary action, arranged in parallel.

This invention belongs to the field of metering box technology, specifically a fireproof energy metering box. It includes a metering box body, a moisture-proof mechanism located on the upper right side wall of the metering box body, and a pressure relief mechanism located on top of the moisture-proof mechanism. The pressure relief mechanism includes a shell, with a limiting plate fixedly connected inside the shell. A ball groove with a tube groove is formed at the center of the limiting plate. A blocking ball is placed on top of the limiting plate, and the blocking ball is adapted to the ball groove. A connecting rod is fixedly connected to the top of the blocking ball, and a fixing spring is connected to the top of the connecting rod. During heat dissipation, the airflow pushes the blocking ball upwards, allowing heat to escape through the louvers. In case of fire, the blocking plate closes, and the fixing spring pushes the blocking ball downwards to block the ball groove. When the internal pressure is too high, the airflow pushes the blocking ball upwards, achieving pressure relief inside the metering box and solving the problem of increased pressure and explosion risk during a fire.

The invention relates to the technical field of urban municipal engineering safety, and provides an urban gas pipe network space-time risk assessment method and system, and the method comprises the steps: constructing a pipe network digital twinborn model fusing multi-source data; aiming at the metal pipeline, calculating the effective wall thickness of the pipeline by applying the nonlinear time-varying corrosion model corrected by the soil corrosivity index; calculating the biaxial stress of the pipe wall through a mechanical model considering the coupling effect of internal pressure, soil, traffic, temperature and frost load based on the effective wall thickness; according to the material of the pipeline, calculating a dynamic safety coefficient by adopting a criterion based on fracture mechanics or allowable stress; and finally, risk levels are divided according to the safety coefficient, and space-time visual display is carried out on a GIS platform. According to the method, the defects that a traditional method depends on historical data, models are simplified and space-time dynamic analysis is lacked are overcome, the pipe network risk can be accurately quantified and predicted, and a scientific basis is provided for preventive maintenance.

To provide a method for forming a structure and a structure that can shorten the construction period. [Solution] The method for forming a structure includes: a membrane fixing step of fixing the edges of a first membrane 4, a second membrane 6, and a third membrane 8 to a foundation 2, placing the second membrane 6 on top of the first membrane 4, and placing the third membrane 8 on top of the second membrane 6, and forming a first space 10 between the first membrane 4 and the second membrane 6 and a second space 12 between the second membrane 6 and the third membrane 8; a first filler filling step of filling the first space 10 with a first filler and holding the second membrane 6 in a predetermined shape with the internal pressure of the first filler; and a second filler filling step of filling the second space 12 with a second filler while the second membrane 6 is held in a predetermined shape.

The present invention relates to a capsule (100) characterized by being subdivided into at least two chambers, wherein at least one expandable chamber (101) and at least one retractable chamber (103) are separated by at least one flexible membrane (102). There is also the possibility of having at least one pressure relief hole (104) in the retractable chamber (103). This invention addresses two distinct challenges: the controlled positioning of a material contained within the interior of an expandable chamber (101), and the ability to more efficiently contain materials that expand and contract, generating volume variations and consequent changes in a internal pressure of the capsule (100) without altering its external geometry or compromising its integrity.

Method for manufacturing a flexible strain sensor, comprising: Placing a flexible substrate on a movable stage in a working chamber, in which the movable stage, suitable for a desired movement according to a control signal, and a nozzle, suitable for spraying towards an upper surface of the movable stage, are installed, and with which a first pressure control unit, suitable for controlling an internal pressure of the working chamber, is combined; and preparing a printing material mixture, which comprises metal nanoparticles and carbon nanotubes (CNTs) in a powder form, which is to be introduced into a printing material tank, which is provided with an upper outlet that communicates with a nozzle via a first communication line, and a lower inlet, with which a second pressure control unit, suitable for controlling pressure, is combined. Control, by means of a control unit, a movement of the movable stage by providing a predetermined motion control signal to the movable stage in order to move the flexible substrate at a desired speed along a path which corresponds to a predetermined conductor pattern of a strain sensor, Forming a relatively low-pressure atmosphere within the working chamber by operating the first pressure control unit and simultaneously a relatively high-pressure atmosphere at a lower inlet of the pressure material tank by operating the second pressure control unit, In parallel with controlling the movement of the movable stage, the printing material mixture is forcibly transmitted in an aerosolized state through the first communication line from the printing material tank to be sprayed through the nozzle towards a surface of the flexible substrate by means of a compression wave, which is caused by a pressure difference between the low-pressure atmosphere and the high-pressure atmosphere. Direct printing of a predetermined conductor pattern of the strain sensor onto the flexible substrate by a process in which the printing material mixture, which is extruded through the nozzle, collides with the surface of the flexible substrate to create cracks on the surface, and the CNTs penetrate into the cracks and are mechanically anchored to the flexible substrate, and then the following metal nanoparticles and CNTs of the printing material mixture are deposited in a predetermined width and height on the surface of the flexible substrate. Connecting a first and a second lead wire, which extend electrically to protrude from the flexible substrate, to both ends of the predetermined conductor pattern of the strain sensor and Binding a flexible cover, which has the same size as the flexible substrate, to the surface of the flexible substrate on which the predetermined conductor pattern is printed, so that the predetermined conductor pattern is inserted between the flexible substrate and the flexible cover.

The application discloses a natural gas pipeline stress detection method, device, equipment and storage medium, and belongs to the technical field of natural gas pipeline safety monitoring. The method comprises the following steps: establishing a saturated magnetic field in a target detection section of a natural gas pipeline; collecting magnetic flux density, spatial difference signals, internal pressure and temperature in the saturated magnetic field; correcting and interference suppressing the collected data; inputting the processed data into a magnetic-force coupling model to establish the correlation between the pipeline stress and the magnetic flux density and the magnetization parameters; sequentially compensating the magnetic flux density based on the temperature and the strain rate; and finally combining the correlation to construct an inversion cost function, inputting the compensated data to obtain the pipeline stress distribution of the target section. The application does not need to invade the inside of the pipeline, guarantees the stable correlation between the magnetic characteristics and the stress through the saturated magnetic field, eliminates the environmental and dynamic factor interference through double compensation processing, significantly improves the stress detection accuracy, and can provide data support for the safe operation and risk early warning of the natural gas pipeline.

The present application relates to compressed air energy storage technology field, specifically to a kind of compressed air energy storage cavern sealing system, by setting up steel pipe in the maintenance passage, steel pipe is welded with gas storage cavern steel lining, end plate is embedded in the concrete of plugging body, sealing door is set on end plate, and steel pipe is welded and connected with end plate, not only effectively solve the difficult installation of sealing door in traditional curved interface, the problem of poor sealing performance, also significantly improve the structural safety and air tightness of plugging body.The setting of end plate can ensure that the sealing door body is firmly fixed, realize internal pressure uniform dispersion, effectively avoid the risk of crushing caused by stress concentration of concrete, which is beneficial to significantly reduce the probability of gas leakage.The design of the sealing system fully embodies the unity of structural safety and sealing reliability.

The present invention provides an estimation device capable of estimating the flow rate of gases entering the interior space of a container. [Solution] The estimation device comprises a supply unit (231a, 231b) that supplies gas to the internal space (5) of the container (1), a first pressure detection unit (170) that detects the internal pressure, which is the pressure in the internal space (5), and a control unit (110) that determines an airtightness index, which is an indicator of the airtightness of the internal space (5). The control unit (110) estimates a first flow rate, which is the flow rate of gas supplied to the internal space (5), based on the internal pressure during operation of the supply unit (231a, 231b) and the airtightness index.

The invention discloses an axial auxiliary thin-wall pipe thermal expansion graphite forming method, and belongs to the technical field of metal pipe precision forming. The thermal expansion graphite with different properties is selected in the thin-wall pipe fitting and at the two ends of the thin-wall pipe fitting, the internal pressure for forming the thin-wall pipe fitting and the load required for axial end part material supplementation are provided by utilizing different thermal expansion effects and generated thermal-mechanical properties of the thermal expansion graphite under a certain temperature condition, and therefore near-equal-wall-thickness and high-quality forming of parts of the kind is achieved. The method provided by the invention has the advantages of simple mold structure, convenience in process operation and the like, and has relatively high engineering application and popularization values in the aspect of thin-wall pipe fitting forming in the fields of aerospace, machinery, automobiles and the like.

The invention relates to a device and a method for testing cracking and sealing performance of a lining structure under a high internal pressure condition, and belongs to the technical field of compressed air energy storage. The test device comprises a cavern simulation cavity, a rubber capsule, a prefabricated lining device, a high internal pressure loading system and a data acquisition and monitoring system. The rubber bag is arranged in the cavern simulation cavity, the prefabricated lining device is located on the outer side of the rubber bag and comprises a sealing layer and a concrete lining layer, and the high internal pressure loading system communicates with the rubber bag and is used for applying a controllable high internal pressure load into the rubber bag, so that the concrete lining layer cracks under the action of radial internal pressure; and the data acquisition and monitoring system is used for monitoring stress deformation and crack development of the lining layer and the sealing performance of the sealing layer. By means of the testing device and method, the cracking process of the lining of the high-internal-pressure gas storage cavern and the influence of the cracking process on the sealing layer can be simulated, and a testing basis is provided for safety and sealing performance evaluation of the underground gas storage cavern.

The invention provides a coating cladding testing device which comprises a simulation cladding located in a high-temperature and high-pressure water environment, the outer wall of the simulation cladding is coated with a coating, a closed cavity is defined by the simulation cladding, and the internal pressure of the cavity is adjustable; the heating rod is arranged in the cavity of the simulation cladding, a plurality of annular ridges are arranged on the heating rod, the annular ridges are arranged in the axial direction of the heating rod at intervals, and the annular ridges annularly protrude in the radial direction of the heating rod; wherein the ring surface, located on the outermost side in the radial direction, of the ring ridge makes contact with the inner wall of the simulation cladding, a through hole is formed in the ring ridge, and the through hole penetrates through the two opposite side faces, in the axial direction, of the ring ridge. And testing the performance of the coating cladding in a high-temperature and high-pressure water environment and internal stress change coupling scene.

This invention provides a fully enclosed microfluidic pressure control system and method, relating to the fields of cryogenic metering and precision pressure control. The system includes a first cryogenic thermostat and a second cryogenic thermostat; a connecting pipe linking the gas phase spaces of the two thermostats to form a fully enclosed gas loop; a gas flow control valve located on the connecting pipe; an active temperature control unit thermally coupled to the second cryogenic thermostat; and a central control system that, based on the deviation between the actual pressure and the target pressure of the first cryogenic thermostat, controls the active temperature control unit to adjust the temperature of the second cryogenic thermostat to generate a pressure difference, and controls the opening of the gas flow control valve according to the deviation, allowing the working gas to transfer within the fully enclosed gas loop to regulate the internal pressure of the first cryogenic thermostat. This invention achieves zero-loss recycling of the working gas and is suitable for high-precision pressure control in applications such as ultra-low temperature physics experiments, quantum computing, and cryogenic thermostats.

The utility model belongs to the technical field of detection equipment, and particularly relates to a tubular product external pressure test tool. Comprising an outer box body which surrounds the sample pipe and is provided with a spacing part between the outer box body and the sample pipe; the supporting part comprises a first end connected with the outer surface of the sample pipe and a second end connected with the outer box body; the supporting part is used for positioning the sample pipe so as to maintain the spacing distance between the outer surface of the sample pipe and the outer box body; the packaging part, the outer box body and the outer surface of the sample pipe are matched to form at least part of the inner contour of the spacing part; and the guide pipe is arranged on the outer box body or the packaging part, and the spacing part is communicated to the voltage withstanding test equipment through the guide pipe. The device is a pipe external pressure test tool which can be matched with internal pressure test equipment, is good in compatibility with the internal pressure test equipment, is easy to obtain materials, is simple in installation mode, and has relatively low price cost and operation learning cost.

The invention relates to the technical field of nonmetal pipeline performance detection, in particular to a multifunctional experimental device and method for nonmetal pipeline detection, and the method comprises the steps that a tensile stress test platform heats an experimental environment temperature to a set temperature, and a first to-be-detected nonmetal pipe section is stretched to be fractured; the composite test end obtains a tensile property curve of the nonmetal pipeline according to the real-time traction force value returned by the tensile stress test platform; the internal pressure test platform heats the experimental environment temperature to a set temperature, and inflates the second to-be-tested non-metal pipe section until bursting; and the composite test control end obtains an internal pressure resistance curve of the non-metal pipeline according to the real-time internal pressure value returned by the internal pressure test platform. According to the device and the method, a traction performance test and an internal pressure performance test can be simultaneously performed on the non-metal pipeline at different experimental temperatures, so that a tensile resistance performance curve and an internal pressure resistance performance curve of the non-metal pipeline are obtained, and the comprehensive performance detection efficiency of the non-metal pipeline is improved.

The invention belongs to the technical field of material containing containers, discloses a high-pressure pressure-bearing material containing tank, and aims to solve the problems that an existing material containing tank is low in pressure-bearing capacity and complex in anti-leakage process. The material containing tank comprises a tank body, an anti-corrosion and anti-leakage inner layer arranged in the tank body and a filling layer arranged between the tank body and the inner layer. And a reinforcing structure is arranged in the filling layer. The reinforcing structure can be at least one layer of reinforcing net made of high-strength ribs, or consists of a pore plate and a curing material. A pressure dividing partition plate can be further arranged in the material containing tank to decompose the pressure in the cabin. Through the composite reinforced shell and the internal pressure-dividing structure, the pressure-bearing capacity, the safety and the storage capacity per unit volume of the tank body are remarkably improved, the structure is reliable, and the manufacturing cost is controllable.

The utility model relates to the technical field of material constant temperature, and discloses an adjustable material constant temperature device which comprises an outer cylinder and an inner container. According to the adjustable material constant-temperature device, through the arrangement of the pressure relief assembly, when the adjustable material constant-temperature device is used, due to the fact that corresponding gas is generated when multiple materials in the inner container are mixed, the internal air pressure is increased, the gas pushes a piston blocking the thin end of a pressure relief pipe, the piston moves upwards to the thick end of the middle, and a sliding rod is pushed to slide on a positioning piece; when the internal air pressure is normal, the telescopic spring recovers the deformation to push the piston and seal the pressure relief pipe, and meanwhile, when the internal air pressure needs to be adjusted, a limiting nut is rotated on a sliding rod, and the elastic force of the telescopic spring is adjusted by reducing the length of the sliding rod; therefore, the effect of adjusting the internal air pressure of the material constant temperature device is achieved, the inner container structure is prevented from being damaged by overlarge internal air pressure, and the service life of the device is prolonged.

The application discloses a verification method for burst pressure of a type IV high-pressure hydrogen storage cylinder, and comprises the following steps: establishing a hydrogen storage cylinder geometric model; obtaining material performance parameters of each structure of the hydrogen storage cylinder; applying a design internal pressure load to the hydrogen storage cylinder geometric model to perform internal pressure static load simulation analysis, and obtaining variation rules of stress values of key positions with the internal pressure load; establishing a strain failure criterion suitable for the hydrogen storage cylinder, performing progressive damage failure simulation analysis on the hydrogen storage cylinder, and obtaining variation rules of axial and ring direction displacements of the hydrogen storage cylinder with the internal pressure; determining the burst pressure of the hydrogen storage cylinder through the internal pressure static load simulation analysis and the progressive damage failure simulation analysis respectively, taking the minimum value of the burst pressures obtained through the two methods as the burst strength; and comparing the determined burst strength with a design burst pressure to verify rationality of the hydrogen storage cylinder design. The burst strength calculated by the method is more accurate, and the safety of the hydrogen storage cylinder in use can be further ensured.

The present application relates to the technical field of underground gas storage, and discloses a double-layer sealing structure for underground gas storage, a design method and a construction method thereof. In the double-layer sealing structure, a complete closed shell is formed by on-site roll bending and continuous welding of a high-elastic steel plate, and together with a sliding layer, forms an overall sealing system without joints and weak links. Compared with the traditional block lining or the scheme of setting expansion joints, the leakage hidden danger caused by stress concentration or material aging at the joints or joints is completely avoided, and the long-term gas-tight reliability of the gas storage under the repeated action of high internal pressure is improved. At the same time, the sliding layer is made of flexible material, which can effectively absorb the displacement and cracking deformation of the surrounding rock caused by pressure change, and uniformly transmit the deformation to the high-elastic steel sealing layer, so that the sealing structure can be transformed from passive adaptation to active adaptation, avoiding stress concentration and crack propagation caused by deformation incoordination of the traditional rigid lining, thereby preventing the sealing layer from being torn or pierced.

The invention relates to an underground energy storage chamber adapting to alternating high internal pressure conditions and a deformable connecting structure thereof, and the deformable connecting structure comprises two connecting steel plates which are respectively and vertically fixed to the end parts of two annularly adjacent chamber body steel plates; longitudinal channels are formed in the outer side faces of the connecting steel plates, and when the two connecting steel plates are in annular butt joint, the channels in the two sides are in butt joint, and the whole space is filled with rubber sealing strips. Bolt holes perpendicular to the connecting steel plates are formed in the positions, located on the two sides of the cave body steel plate, of the connecting steel plates, the connecting bolts are inserted to connect the two connecting steel plates, the rubber sealing strip is compressed, and the two connecting steel plates are spaced by a specified interval in the annular direction. Self-adaptive deformation can be achieved under the high-pressure alternating load, stress concentration of a heat affected zone is effectively relieved, microcrack propagation is prevented, and therefore long-term stable sealing performance is ensured, expansion and shrinkage caused by temperature fluctuation are absorbed through an elastic compensation mechanism, and the reliability and durability of the whole structure in a severe environment are improved.

The application relates to a method and device for determining the outgassing characteristics of internal materials of wafer-level vacuum packaged devices. The method comprises: obtaining a target pressure; wherein the target pressure is the internal pressure of a test sample, and the test sample is a wafer-level vacuum packaged micro-electro-mechanical system (MEMS) device; under the condition that the test sample is placed in a test device and the internal pressure of the test device is the target pressure, the target characteristic parameters of the test sample at various test temperatures are obtained by adjusting the temperature of the test device; and the outgassing characteristics of the internal materials of the test sample are determined according to the target characteristic parameters of the test sample at various test temperatures. The method can accurately determine the outgassing characteristics of the internal materials of wafer-level vacuum packaged devices.

The present application relates to the technical field of nuclear power plant containment structure deformation measurement, and discloses a pressure deformation measurement method for a nuclear power plant containment and related devices. The method comprises obtaining the outer curved surface geometric design parameters and correction parameters of the outer dome at the outer monitoring point, and the inner curved surface geometric design parameters of the inner dome at the inner monitoring point; obtaining the strain measurement value of the outer monitoring point of the outer dome under the action of the environmental load in the state that the inner shell bears the internal pressure; determining the free displacement estimation value of the outer shell at the outer monitoring point; determining the actual displacement value of the outer shell in the environment; determining the relative displacement change between the inner monitoring point and the outer monitoring point; and determining the deformation displacement of the inner shell at the inner monitoring point under the loaded state. The present application does not need to set up components such as metal wires inside the inner shell which are easily affected by temperature, but calculates the deformation displacement of the inner shell by the strain measurement value, the relative displacement measurement value, and the geometric design parameters and correction parameters, so as to weaken the interference of temperature on the measurement result.

This invention provides a method for simulating buckling of subsea pipelines based on the pipeline element method, addressing the problems of low computational efficiency, complex modeling, and low accuracy in existing methods. Based on Euler-Bernoulli beam theory, this invention models the pipeline as a series of efficient pipeline elements. Internal pressure is converted into equivalent temperature rise, and the effective thermal expansion force generated by the effective temperature rise is applied to both ends of the pipeline element to construct the total potential energy equation. The second derivative of the total potential energy equation is performed to obtain the tangent stiffness matrix of the pipeline element. An updated Lagrange method is used for coordinate transformation. The secant relationship is used to calculate the pipeline element and soil resistance. A Newton-Raphson incremental-iterative numerical program is established to perform nonlinear analysis of the pipeline, progressively solving for the deformation and stress of the pipeline under complex loads. This invention significantly reduces the number of elements, improves computational efficiency, and accurately simulates nonlinear pipe-soil interactions. It is applicable to various pipelines, including short pipes, long pipes, and corroded pipes, as well as complex working conditions such as high temperature and high pressure.

A method and apparatus for evaporative cooling of materials within a vacuum chamber by maintaining a controlled partial pressure environment. The method involves sealing material inside a chamber, reducing the internal pressure using a vacuum pump, and simultaneously introducing external gas—such as ambient air, nitrogen, or inert gases—into the chamber. A constant partial pressure is maintained by balancing the gas input and vacuum pump operation, allowing for efficient evacuation of vaporized liquid without recondensation. The system can operate with either constant or variable flow rates for both gas input and vacuum pumping, depending on desired cooling conditions, chamber size, and material characteristics. The apparatus includes a sealable vacuum chamber, at least one external gas inlet, and a vacuum pump configured to sustain the target partial pressure.

The vapor chamber (1) has a flat-plate-shaped housing (50) in which an internal space (20) is formed, and the housing (50) has formed therein: a heat-receiving section (3) that receives heat from a heat source body (2), a vapor flow path (5) through which a refrigerant (CO) vaporized in the heat-receiving section (3) moves, and a capillary flow path (4) through which the refrigerant (CO) liquefied by heat dissipation is conveyed to the heat-receiving section (3) by means of a capillary force. A plurality of spacers (42) for reinforcing the housing (50) are arranged in the internal space (20) along the surface direction of the housing (50). When [delta] c [mm] is the allowable amount of bending deformation of the housing (50), E [N / mm2] is the longitudinal elastic coefficient of the housing (50), I [mm2] is the moment of inertia of the cross section of the housing (50), and w [N / mm] is the uniform load applied to the housing (50) per unit length due to the internal pressure or external pressure generated in the internal space (20), [delta] c [mm] is the allowable amount of bending deformation of the housing (50), E [N / mm2] is the longitudinal elastic coefficient of the housing (50), I [mm2] is the moment of inertia of the cross section of the housing (50), and w [N / mm] is the uniform load. The distance (Lsp [mm]) between the spacers (42) and the joining protrusions (17) that are adjacent to each other is defined so as to satisfy the following formula.

The present application provides a kind of light weight liquid ammonia storage tank filling and discharging performance test platform, including light weight composite reinforced corrosion-resistant storage tank system, input or export gaseous ammonia to the storage tank to be tested by the ammonia supply and transportation system connected therewith;Light weight composite reinforced corrosion-resistant storage tank system is internally provided with multi-zone temperature monitoring system for real-time monitoring of temperature variation at different positions inside the storage tank;The light weight composite reinforced corrosion-resistant storage tank system is internally provided with internal gas circulation homogenization system for promoting gas flow inside the storage tank and improving temperature distribution;The control and safety protection system is used for real-time acquisition and regulation of storage tank internal pressure, liquid level, flow and temperature parameters, and safety pressure relief and protection under abnormal conditions;The present application can monitor and control the liquefaction process after ammonia is filled into the storage tank and the vaporization process when liquid ammonia is output, so as to test and analyze the temperature distribution, liquid level change, flow change and internal flow state during filling and discharging process.

The invention relates to the technical field of compressed air energy storage, in particular to a cavern burial depth design method, equipment and medium based on an upper limit theorem limit lift-resistant model.The design method comprises the steps of determining design parameters, establishing a failure function curvilinear equation, determining failure function constants and solving the horizontal distance of a failure function extending to the earth surface; solving the soil body area in the failure function curve, solving the limit internal pressure, comparing the limit internal pressure with the designed internal pressure to judge whether the precision meets the requirement or not, and if yes, outputting the safe burial depth; if the requirement for adjusting the initial burial depth is not met, the loop iteration algorithm step is repeated until the precision meets the requirement, and the safe burial depth is output; according to the method, on the basis of the limit analysis upper limit theorem, the cavern upheaval failure function is deduced under the condition that the rock mass is assumed to obey the associated Hoek-Brown criterion, the real failure form of surrounding rock upheaval failure can be restored, the upheaval resistance response of the overlying surrounding rock under the most unfavorable working condition of crack penetration can be simulated, the burial depth calculation result is more reasonable, and the engineering applicability is improved.

The invention discloses a stratospheric aerostat pressure difference control method, which belongs to the field of flight control, is used for aerostat pressure difference control, and comprises the following steps: starting an aerostat pressure difference control program, detecting the internal temperature condition of an aerostat caused by external environment change, judging whether the aerostat is in a normal environment or not, if so, changing the volume of an internal phase change air bag, and if not, judging that the aerostat is in the normal environment. If yes, the internal pressure of the aerostat changes, then whether the pressure difference is within the safety range or not is judged, if not, the volumes of the internal and external phase change air bags cooperatively change, the internal pressure change and the height change of the aerostat enable the external atmospheric pressure of the aerostat to change, and then whether the pressure difference is within the safety range or not is judged; and judging whether the pressure difference is within a safe range, if not, returning to detect the internal temperature condition of the aerostat caused by the change of the external environment, and if so, ending the pressure difference control method. Under the normal day and night alternation condition, the volume of the internal phase change air bag is adjusted, the internal pressure of the aerostat is adjusted, and the internal and external pressure difference of the stratospheric aerostat is always kept within a safe range.

The application discloses a kind of electronic detonator sealing test tubes under the condition of temperature and pressure coupling and sealing performance detection test method, its method includes the following steps: a certain amount of chemical reagent is loaded in empty tube shell, to ensure that the gas production after thermal decomposition reaches target pressure by internal pressure;Power positive line, negative line and signal line are welded on PCB board, then loaded into empty tube shell, injection plug card is blocked to empty tube shell, to obtain test tube;Power positive line and negative line are connected with power supply, and signal line and negative line are connected with signal amplifier and oscilloscope;Test tube is placed in high-low temperature chamber, heated to decomposition temperature, observe the internal pressure change of test tube, keep high temperature until target pressure is reached;Lower to preset low temperature, record pressure change curve and analyze.The application considers the influence of environmental temperature change on the sealing performance of electronic detonator, realizes real-time quantitative analysis of sealing performance, effectively improves the test efficiency of electronic detonator sealing performance detection.