463 results about "Internal pressure" patented technology

The invention discloses an underground gas storage prestress lining structure and a construction method, and relates to the technical field of underground gas storage, the underground gas storage prestress lining structure comprises a lining layer formed by concrete pouring and internally provided with prestress steel bars; the sealing layer is arranged on the inner side of the lining layer and defines a gas storage chamber; the sliding layer is arranged between the lining layer and the sealing layer. The arrangement of the prestressed reinforcements can counteract part of internal pressure of the gas storage, so that the problem of concrete cracking is relieved. The lining layer is divided into the first lining layer and the second lining layer, the tensioning notch is reserved in the bottom of the first lining layer and provides sufficient tensioning space for the prestressed steel bars, the tensioning effect of the prestressed steel bars is ensured, the second lining layer is formed in the tensioning notch in a pouring mode after the prestressed steel bars are tensioned, and the integrity of the lining layer is ensured. After the sealing layer is constructed, grouting is conducted on the gap between the lining layer and the sliding layer, it is guaranteed that grouting is compact and complete, stress concentration is reduced, and the problem of concrete cracking is further relieved.

The invention relates to the field of theoretical calculation and numerical simulation of ship structure protection and cavitation, in particular to a bubble pulsation initial condition inversion method and system based on a bubble energy loss target. Inputting characteristic parameters and energy parameters of the bubbles, and determining a target variable value of inversion calculation; taking a bubble maximum volume moment as an initial calculation moment, randomly giving a bubble internal pressure value at the bubble maximum volume moment, and determining a bubble initial condition in inversion calculation; reversely carrying out time integration on the basis of a compressible spherical bubble pulsation equation to obtain bubble characteristic parameters at zero moment; calculating a time calendar evolution process of a bubble radius by taking a bubble characteristic parameter obtained by reverse time integration as a bubble pulsation initial condition, and judging whether the energy loss of the bubble reaches a target value or not; and adjusting the bubble internal pressure value at the moment of the maximum volume of the bubbles for re-calculation, solving a bubble radius time calendar process, and recording bubble characteristic parameters after reaching an expected target as a new bubble pulsation initial condition. The method is used for solving the problem that the initial bubble pulsation condition is difficult to determine in the existing bubble dynamics theory and numerical calculation.

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.

The invention relates to the field of material sealing performance testing, in particular to an airtight performance testing device, system and method for a sealing material.The testing device comprises a sealing container and a testing table, an inner cavity of the sealing container comprises a first air chamber and a second air chamber, and the testing table is fixedly installed in the sealing container to separate the first air chamber from the second air chamber; the test bench is provided with a through test seam. A pressurizing pipeline, a pressure relief pipeline and a pressure measuring pipeline are arranged on the sealed container, the pressurizing pipeline and the pressure relief pipeline are both communicated with the first air chamber, and the pressure measuring pipeline is communicated with the second air chamber; the sealing material is arranged on one surface, facing the first air chamber, of the test bed and covers the test seam; the pressurizing pipeline pressurizes the first air chamber to enable the pressure in the first air chamber to be higher than that in the second air chamber. The sealing container can be pressurized and heated to simulate alternately-changed internal pressure and temperature environments in the gas storage chamber, the sealing performance of a sealing material on a test seam can be tested, the permeability of the sealing material can be calculated, and the damage mechanism of the sealing material extruded along the seam can be studied.

The invention discloses horizontal concrete drain pipe internal pressure test equipment, and relates to the technical field of concrete drain pipe internal pressure tests. The mounting plate is arranged at the top of the bottom plate; two adjusting sliding grooves are formed in the position, located below the sliding baffle, of the bottom plate, and two adjusting sliding blocks are fixedly connected to the bottom of the sliding baffle. According to the horizontal concrete drain pipe internal pressure test equipment disclosed by the invention, when the open end of a drain pipe body is sealed, the drain pipe body is moved to a specified position between a matching baffle and a sliding baffle, a hydraulic cylinder III drives a middle column to move towards the interior of the drain pipe body, and in the moving process, the hydraulic cylinder III drives the middle column to move; the sealing gasket is gradually clamped on the inner wall and the outer wall of the opening end of the drainage pipe body, one-layer sealing is achieved, the air pump is started, the air pump inflates the interior of the sealing air bag through the air pipe, the expanded sealing air bag makes close contact with the inner side wall of the drainage pipe body, and the second-layer sealing effect is achieved.

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.

A manufacturing method and structure for a composite material racket frame includes the following steps:(a) Resin impregnation: Impregnate a composite material with resin;(b) Wrapping the core mold with composite material: Use a core mold in the shape of a racket, made of polymethacrylimide (PMI) or expanded polypropylene (EPP) material; then wrap the composite material around the core mold to form a composite material layer. The mutually wrapped composite material layers and core mold together form a semi-finished product;(c) Heating and pressurizing: Place the semi-finished product into a mold with a cavity, and heat the mold to a preset temperature. After heating, the core mold expands due to heat, forming internal pressure within the semi-finished product;(d) Cooling and curing: Stop heating and allow the semi-finished product to cool until it reaches a cured state, and(e) Finished product formation: Remove a finished racket frame from the mold.

Disclosed is a method for estimating the variation in the load carried by a mounted assembly of a convoy, generated by loading the loading volume of the stationary trailer, the method comprising the following steps: • Loading the trailer; • Recording the internal pressure P in the fluidic cavity of an equipped mounted assembly; • Recording the internal temperature T in the fluidic cavity of the equipped mounted assembly; • Evaluating a variation in the volume ΔV of the equipped mounted assembly by means of the recorded internal pressure P and the recorded internal temperature T using a model of a fluid in adiabatic transformation, the fluid having perfect gas behaviour; and • Estimating a variation in the load ΔZ carried by the equipped mounted assembly using a second function comprising, as a parameter, the evaluated intermediate variation in volume ΔV and the flattening stiffness of the mounted assembly per unit volume KP.

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 relates to a full-self-anchoring flexible connection stainless steel composite steel pipe, and belongs to the technical field of full-self-anchoring steel pipes. A self-adaptive dynamic compensation structure is introduced, and when the extrusion stress borne by a rubber ring exceeds a preset threshold value, the structure is in linkage fit with a spring movable part through a sliding part; the axial displacement compensation and the elastic pre-tightening force are cooperated, and the extrusion stress of the rubber ring is dynamically maintained in a reasonable range, so that the sealing effect can be maintained when the rubber ring deforms due to aging or abrasion, the pressure fluctuation caused by heat energy generated by friction between water flow and a pipe wall and environment temperature change can be coped, and the service life of the pipe is prolonged. By means of the design, the situation that the rubber ring bears extrusion stress exceeding a design value due to the fact that internal pressure is increased is avoided, stress concentration and structural fatigue are reduced, the service life of the rubber ring is prolonged, the maintenance cost and the replacement period of a long-distance buried pipeline are reduced, and the vicious circle problem that the service life of an existing structural rubber ring is shortened is effectively solved.

The invention discloses a steel curtain belt reinforced wear-resistant composite pipeline and a defect detection device, and relates to the technical field of defect detection, the steel curtain belt reinforced wear-resistant composite pipeline comprises a pipe body, the section structure of the pipe body comprises a lining transmission layer, a reinforcing layer and an outer protection layer which are sequentially arranged from inside to outside, and the reinforcing layer, the lining transmission layer and the outer protection layer are bonded and compounded into a whole; the reinforcing layer is made of a prepreg tape type steel curtain tape in a bidirectional winding mode, the reinforcing layer material steel curtain tape is a tape with extremely high tensile strength, and after the reinforcing layer material steel curtain tape is made into the pipeline, the pressure resistance of the pipeline is higher than that of pipelines made of other types of reinforcing materials. According to the pipeline made of the steel curtain belt serving as the reinforcing layer material, the internal pressure resistance of the pipeline is guaranteed, and meanwhile the external impact resistance is very high.

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.

An apparatus for applying pressure to a pipe and measuring internal pressure. The apparatus including jacket disposed on the pipe, one or more of a first set of strain gauges disposed on a wall of the pipe, one or more of a second set of strain gauges disposed on the wall of the pipe, and a temperature sensor disposed on the wall of the pipe. The pipe has an inner diameter, an outer diameter, and a length.

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 discloses a fixed gap cylindrical surface sealing gap pressure distribution testing device, and belongs to the technical field of cylindrical surface sealing test. The sealing device comprises a sealing stator assembly, a sectioning shaft sleeve assembly, a shaft sleeve driving assembly and a mounting seat assembly, the sectioning shaft sleeve assembly and the shaft sleeve driving assembly are both arranged on the mounting seat assembly; the split shaft sleeve assembly comprises a split shaft sleeve and a shaft sleeve clamping assembly used for clamping the shaft sleeve. The shaft sleeve is rotatably arranged on the mounting seat assembly; the shaft sleeve is sleeved with the sealing stator assembly, and a sealing gap is formed between the sealing stator assembly and the shaft sleeve; the shaft sleeve is controlled by a shaft sleeve driving assembly to realize axial movement and rotation; the testing device further comprises a sensor used for measuring pressure at the inlet and outlet of the sealing gap and internal pressure. According to the invention, based on the structural design which is simple and convenient to mount and dismount, the accurate test of the omnibearing pressure distribution of the fixed gap cylindrical surface sealing gap is realized.

The invention relates to the technical field of underground high-pressure gas storage structures, in particular to a sandwich steel lining type underground high-pressure gas storage tank and a performance simulation analysis method thereof. The gas storage tank is characterized in that the outer side of a gas storage cavity is wrapped by a composite lining structure, a plurality of drainage holes are formed around the gas storage cavity, anchor rods are fixed in intervals between every two drainage holes, and a gas inlet / outlet (pipe) is formed in the top end of the gas storage cavity and communicated with the outside through a traffic / overhaul channel; the method comprises the steps of collecting parameters of the gas storage tank to create a three-dimensional geometric model of the gas storage tank, establishing a simulated earthquake database, simulating the effects of earthquakes of different earthquake magnitudes on the gas storage tank, and obtaining a stress distribution diagram and a deformation diagram of the gas storage tank; and comparing the simulation data with the collected data to obtain potential problems and adjust the structure of the gas storage tank. A sandwich type is adopted, surrounding rock is fully utilized for bearing, the using amount of steel linings can be greatly reduced, and meanwhile the purposes of bearing high internal pressure, resisting external pressure stably and reducing the construction cost are achieved.

The invention provides a forming method of a composite hollow D-shaped beam, and relates to the technical field of D-shaped beam forming. Firstly, a composite layer is laid in a cavity of a lower die; placing a foam air bag integrated structure on the composite material layer laid in the lower mold, and laying the composite material layer on the surface of the air bag to form a product; then the upper die and the lower die are connected to complete die assembly, the product is heated, the air bag is inflated through the air nozzle, and internal pressure is provided for the product; after the forming duration is reached, the upper mold is dismantled, deflation is conducted through an air nozzle, the foam air bag integrated structure is taken out of the self-cured product, and the hollow D-shaped beam is obtained; a foam air bag integrated structure is arranged in the mold cavity, internal pressure is applied to the product through air inflation of the air bag, external pressure is applied to the product through the mold, the internal pressure and the external pressure of the product in the heating process are ensured, and a D-shaped cavity can be formed in the product after the product is fixed and formed.

The invention provides a shaft blockage position detection method which comprises the following steps: determining the leakage depth and collapse depth of a production pipe column after the leakage and collapse of the production pipe column are judged; dividing the production pipe column into a plurality of first sub-production pipe columns; the dynamic pressure in the first sub-production pipe column is calculated; the pressure, corresponding to the production pipe column, of the throttled production pipe column and the temperature, corresponding to the production pipe column, of the throttled production pipe column are determined; according to the pressure of the production pipe column after throttling and the temperature of the production pipe column after throttling, the blocking position and wellhead calculation pressure of the corresponding production pipe column are determined; judging whether the production pipe column meets collapse conditions or not according to the dynamic internal pressure of the first sub-production pipe column and the calculated pressure of the wellhead; and if it is judged that the production pipe column meets the collapse condition, the blockage position of the production pipe column is output, so that the wellbore blockage position can be detected, and the blockage condition of the wellbore blockage position can be determined.

The utility model discloses a comprehensive testing device for external pressure and internal pressure of a pipe fitting, which comprises a pressure-bearing container, a support plate and two tooling flanges, and the two ends of the pressure-bearing container are respectively and fixedly connected with a welding neck flange; the supporting plate is fixedly arranged in the inner cavity of the pressure-bearing container and is used for supporting a test workpiece; a cavity is formed among the pressure-bearing container, the butt welding flange and the test workpiece, and the cavity is used as an external pressure test cavity; the inner cavity of the test workpiece is used as an internal pressure test cavity; the two tool flanges are fixedly connected with the butt welding flange in a detachable mode. The tool flanges plug the two ends of the external pressure testing cavity and the two ends of the internal pressure testing cavity. According to the utility model, the external pressure strength, the internal pressure strength and the internal and external pressure combined strength of the steel pipe can be tested, and the deformation of the steel pipe can be clearly observed.

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 invention relates to the technical field of compressed air energy storage, in particular to a compressed air energy storage artificial cavern structure under the local soft rock stratum condition and a construction method. A plurality of pipelines are arranged in the soft rock cavern, and the two ends of the pipelines are connected with the steel linings in the hard rock cavern in a sealed mode through the end sealing plates, so that the sealing performance and the gas circulation performance of the gas storage cavern are guaranteed; the high internal pressure is mainly borne by the steel pipe, and the small-proportion internal pressure transmits the internal pressure of the pipeline to surrounding rock through concrete between the pipelines. Compared with a steel lining in a hard rock cavern, a plurality of steel pipes with smaller diameters are arranged in the soft rock cavern, so that the internal pressure load sharing rate of soft surrounding rock is favorably reduced, the deformation of the surrounding rock is reduced, and the structural safety is ensured. According to the scheme, a new design concept is provided for application of the compressed air underground gas storage cavern structure under the condition of the local soft rock stratum, and the flexibility of site selection is improved.

The invention relates to a cable pyrolysis gas collecting device in the technical field of cable fault diagnosis and early warning, which comprises a gas collecting bottle, a gas collecting sleeve sleeved outside a cable and a high-pressure bottle for storing high-pressure air, and is characterized in that the gas collecting bottle, the gas collecting sleeve and the high-pressure bottle are respectively provided with a first pressure gauge, a second pressure gauge and a third pressure gauge for measuring internal pressure; a bottle body of the gas collection bottle is made of a transparent heat-resistant material capable of expanding along with internal pressure; the gas collection sleeve comprises a heat transfer sleeve section, heat insulation sleeve sections are connected to the two ends of the heat transfer sleeve section, transition sleeve sections are connected to the outer ends of the two heat insulation sleeve sections, sealing hoops used for clamping and extruding the transition sleeve sections to be tightly attached to a cable for sealing are clamped to the end walls of the outer ends of the two transition sleeve sections in a sleeving mode, and a gas inlet pipe and a gas outlet pipe are arranged on the end walls of the inner ends of the two transition sleeve sections respectively. The air inlet pipe and the air outlet pipe are respectively and correspondingly communicated with openings of the high-pressure bottle and the air collecting bottle through guide pipes with control valves; the collecting device can more completely collect characteristic gas, and the diversity and accuracy of measurement are improved.

The invention discloses a cabinet with an explosion venting function, and the cabinet comprises a cabinet body which is provided with a sealed installation cavity, an explosion venting port which communicates the interior and exterior of the installation cavity, and an explosion venting channel which communicates with the explosion venting port; the explosion venting opening is located in the inner side of the explosion venting channel, and the explosion venting channel is suitable for preventing external foreign matter from reaching the explosion venting opening under the action of gravity. The explosion venting device comprises an explosion venting piece suitable for shielding the explosion venting opening, and the explosion venting device is suitable for enabling the explosion venting piece to act relative to the cabinet body under the action of internal pressure of the cabinet body so as to open the explosion venting opening; and the explosion venting channel is suitable for providing a space for the explosion venting piece to act relative to the cabinet body. According to the cabinet, the problem that external rainwater and dust enter the mounting cavity through the explosion venting opening when the explosion venting opening is opened can be solved.

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 invention discloses a vertical shaft building device and method.The vertical shaft building device comprises a mounting base, a suspension device and a lifting device, the suspension device and the lifting device are fixedly arranged on the mounting base, an excavating device is mounted on the suspension device, and a sealed air bag of the excavating device can build a sealed pressurization area in a shaft wall. By the adoption of the vertical shaft building device and method, the shaft is excavated in an original-state soil taking (dry excavation) mode, so that the mud amount generated by a traditional mud making type excavation method is reduced, and in the working environment of soft soil and soft rock strata, in order to avoid disturbance to an excavation face and influence on the stability of the excavation face in the excavation process, the construction efficiency is improved. The sealed pressurizing area is created on the excavation face through the sealing assembly, unbalanced force generated by the excavation face under the influence of vibration and disturbance can be counteracted through internal pressure generated by the sealed pressurizing area, environment protection around the vertical shaft is facilitated, the construction efficiency is improved, and the construction period is greatly shortened.

The utility model relates to the technical field of submerged arc furnaces, and discloses a protection device for a pressure ring of a corrugated pipe of a submerged arc furnace, which comprises a pressure outer ring and a reinforcing component arranged on the inner side of the pressure outer ring. A pressure inner ring is arranged on the inner side of the pressure outer ring, and a buffer cavity is formed in the inner side of the pressure inner ring; the inner side of the pressure inner ring is provided with a mounting groove for mounting the corrugated pipe, and a circle of buffer shaft is arranged at the joint of the pressure outer ring and the pressure inner ring; the reinforcing part comprises a positioning shaft, and the positioning shaft is arranged on the outer side of the buffering shaft. According to the protection device for the pressure ring of the corrugated pipe of the submerged arc furnace, a multi-layer buffering structure is arranged in the device and comprises the buffering shaft, the buffering cavity, the spring shaft and the telescopic shaft, and the buffering elements are matched with one another to form an efficient buffering and damping system; the buffering elements can respond quickly and absorb impact energy, and the corrugated pipe is protected against damage.

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.