290 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.

The invention is suitable for the technical field of cleaning. The invention discloses a water tank device with balanced internal and external pressure, which comprises a water tank body provided with a storage cavity for storing liquid, a water inlet and outlet mechanism arranged on the water tank body and communicated with the storage cavity after the water tank body is pressed, and a pressure relief mechanism capable of keeping the pressure of the water tank balanced, and the pressure relief mechanism comprises a pressure relief pipe connected with the water inlet and outlet mechanism; a buoyancy component capable of adjusting air pressure in the water tank body is arranged at the free end of the pressure relief pipe, and the pressure relief pipe is provided with a flexible structure between the water outlet pipe and the buoyancy component. Due to the fact that the pressure relief mechanism can keep the air part in the water tank communicated with the outside through the water inlet and outlet mechanism, when pressure occurs in the water tank in the cleaning process, air and clear water can be conveyed out of the water tank together, the internal pressure of the water tank is effectively reduced, the internal pressure and the external pressure of the water tank are balanced, and the pressure rise phenomenon generated in the water tank is avoided.

The invention discloses a damage tolerance evaluation method and system for a friction plug repair welding joint of a carrier rocket storage tank, and the method comprises the steps: detecting an interface of the friction plug repair welding joint of the carrier rocket storage tank, and obtaining defect information, constitutive parameters of a material, and material attributes; establishing a finite element model, and accurately setting corresponding distribution interface defects; quantizing in-plane and out-plane restraint effects of the crack tip by adopting restraint parameters; processing and preparing a unilateral notch tensile sample, and measuring a local J-R curve of the tip of the precrack at the interface of the friction plug repair welding joint; correcting a real J-R curve of the friction plug repair welding joint of the rocket tank based on the influence of the distribution interface defect characteristics; then the tensile strength values of the friction plug repair welding joint in all the positions in the circumferential direction are corrected, and a corrected real J-R curve is obtained; and the limit crack size under the action of the corresponding internal pressure is obtained by utilizing the crack tip extension driving force curve, and then the critical J integral of the crack is calculated, so that the maximum crack size under the specific load or the maximum internal pressure under the crack with the specific size is obtained.

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 an outer cylinder prestress reinforced composite material pipe and a design method thereof, and belongs to the technical field of fluid conveying pressure pipelines. The pipeline comprises an outer cylinder, a middle steel cylinder and a concrete inner cylinder, the pipe diameter is 1600-5000 mm, the outer cylinder is composed of a composite material formed by mixing multiple layers of annularly-wound glass fibers and epoxy resin and is prestressed, the glass fibers account for 50%-70% of the volume of the outer cylinder, the equivalent elastic modulus, the Poisson's ratio and the tensile strength are calculated, mechanical analysis of the composite material is simplified, and the tensile strength of the composite material is improved. The middle steel cylinder is configured as a supporting layer, and the concrete inner cylinder is configured as a pressure-resistant and fluid channel. Based on the thick-wall cylinder theory, the prestress of the outer cylinder enables the concrete inner cylinder to be pressed in advance, the internal pressure tensile stress is counteracted, and the cracking risk is reduced. Under regulation and control of prestress, the outer cylinder bears main circumferential tension, tension of the middle steel cylinder is reduced, and cooperative bearing is achieved. The composite pipe has high strength, light weight and corrosion resistance, the problems that a traditional pipe is prone to cracking, high in steel consumption and short in service life are solved, and safety, durability and economical efficiency are remarkably improved.

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.

The invention provides a heat shrink tube expansion internal pressure self-adaptive adjustment method and device, and the method comprises the steps: carrying out the expansion of a heat shrink tube based on a preset expansion program, and collecting a pressure parameter in the expansion process; performing visualization processing on the collected pressure parameters, performing stage division on the pressure parameters after visualization processing based on an expansion process, enabling a stage division result to correspond to the pressure parameters, and analyzing pressure abnormal data of each stage; acquiring a first-moment heat shrink tube expansion time sequence in an expansion stage, and predicting a first-moment pressure value and a first-moment expansion amount based on the expansion time sequence to obtain a first predicted pressure value and a first predicted expansion amount; and obtaining a second predicted pressure value based on the first predicted pressure value and the pressure data fluctuation value at the first moment, so that internal pressure regulation and control can be accurately and dynamically performed in the expansion process of the heat-shrinkable tube, the overall expansion quality of the heat-shrinkable tube is improved, defective products are reduced, and the uniform specification of the expanded heat-shrinkable tube is ensured.

The invention relates to the technical field of gas purification, and discloses a purifier positive pressure purging explosion-proof control method, which comprises the following steps: S10, system initialization and parameter setting: presetting a pressure threshold value, a flow threshold value and a multi-stage control mode through a control unit, the multi-stage control mode at least comprises three modes of quick boosting in a starting stage, pressure fine adjustment in a stable stage and pressure slow release in a shutdown stage; and S20, real-time pressure and flow detection is conducted, specifically, a pressure detection unit collects the internal pressure of the purifier cavity through a detection port and collects the external atmospheric pressure through a reference port, the actual positive pressure value of the cavity is obtained through calculation, and a flow detection unit synchronously monitors flow data of an air inlet pipeline. The positive pressure purging explosion-proof control method for the purifier aims at solving the problems that an existing positive pressure purging explosion-proof control system is insufficient in adaptability under complex working conditions, low in pressure control precision, high in energy efficiency loss and weak in safety redundancy.

The present disclosure relates to a pressure equalization device for a housing, having a base body with an inner surface and an outer surface, which is configured at least partially as a hollow cylinder, wherein the base body comprises, at its first base surface, a gas passage opening on the housing side, and at its lateral surface, at least one gas pressure relief opening, and a housing seal arranged on the outer surface of the base body in a circumferential direction and comprising a first sealing region and a second sealing region. The first sealing region of the housing seal, in a state in which the pressure equalization device is mounted in the housing, is in contact with the housing and the lateral surface of the housing and seals the housing with respect to the pressure equalization device. The second sealing region completely covers the gas pressure relief opening, and when a pressure difference between the internal pressure on the inner surface of the base body and the external pressure on the outer surface of the base body exceeds a threshold value, is elastically deformable outward in the radial direction and thereby providing a flow-conducting connection between the inner surface and outer surfaces through the gas pressure relief opening.

The present invention relates to the technical field of sealed connection of folding pipes, specifically to a sealing structure and a VCM loading crane pipe to incinerator pipeline. The sealing structure includes a connecting pipe, a buffer ring and a connecting end head. A pair of inner plug-in plates distributed in a circumferential array are provided on the inner side of the connecting end head. The outer wall of the inner plug-in plate is provided with an extrusion paddle inclined toward the outside. The extrusion paddle is rotatably engaged with a first card groove. The beneficial effect is: by arranging the rotatably engaged extrusion paddle and the inclined arc piece, the impact force of the flow along the pipeline is buffered, thereby achieving the stability of the sealing device under repeated impact of internal pressure, improving the service life of the folding pipe, and avoiding leakage.

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 invention discloses a fluid vacuum cooling method based on critical shear rate control. The fluid vacuum cooling method comprises the following steps: placing a fluid material in a rotationally symmetrical vacuum cavity with a material container; establishing a vacuum environment, and enabling the ultimate vacuum pressure in the vacuum cavity to be lower than the saturated vapor pressure corresponding to the target cooling temperature; stirring the fluid material to form a water directional migration channel pointing to the surface from the interior of the material; the stirring shear rate gamma is controlled to be larger than or equal to the critical shear rate gamma crit, a pressure shell layer in fluid is destroyed, an evaporation area is transferred to the surface from the interior of a material, and splashing is fundamentally restrained; and meanwhile, centrifugal backflow of splashing liquid drops is realized by adopting a rotary symmetrical vacuum cavity. Therefore, the splashing of fluid vacuum cooling is greatly reduced, the vacuum cooling time is shortened, and the cooling efficiency is greatly improved.

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 utility model belongs to the technical field of composite material production, and particularly relates to a metal matrix ceramic composite material infiltration tool which comprises a supporting table and a basket body, a barrel body is installed on the top of the supporting table, the interior of the barrel body is hollow, the top of the barrel body is open, a sealing cover is installed on the rear side of the top of the barrel body, and the sealing cover is matched with the opening in the top of the barrel body in size. Cavity channels are symmetrically formed in the lower portions of the two sides of the inner wall of the supporting table, lifting rods are vertically installed on the tops of the cavity channels in a sliding mode, fixing bolts are arranged on the tops of the lifting rods, the basket body is arranged on the inner side of the barrel body, the top of the basket body is open, a composite material is arranged in the basket body, and the basket body is arranged on the tops of the two lifting rods 7. The method comprises the steps that the basket body is arranged on the upper portion in the barrel body and does not make contact with the infiltration liquid, then the sealing cover is closed, vacuumizing is conducted, when the internal pressure of the whole body reaches a threshold value, the basket body is controlled to move downwards, the internal materials are placed in the infiltration liquid, infiltration work is achieved, and the consistency of the internal work during infiltration is guaranteed.

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.

To provide a component loading device which increases kinds of components which can be loaded on a substrate, a component loading system, and a component loading method.SOLUTION: A component loading device comprises a pressing head, a heat elevation mechanism which elevates the pressing head, a pressure regulation section, and a control section which performs driving control of the head elevation mechanism and the pressure regulation section. The pressing head includes a nozzle which presses a component to a substrate in a state where the component is held by a lower-side end, and a main body part in which a pressure chamber capable of energizing the nozzle toward the substrate is provided. The pressure regulation section regulates a pressure in a pressure chamber. When pressing the component to the substrate with a first load which is smaller than a preset load, the control section controls the pressure regulation section in such a manner that the pressure in the pressure chamber becomes a first pressure which generates the first load. When pressing the component to the substrate with a second load which is a load equal to or higher than the preset load, the control section controls the head elevation mechanism in such a manner that the component is pressed to the substrate with the second load.SELECTED DRAWING: Figure 2

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.