162 results about "Double-walled pipe" patented technology

The application provides a kind of super-long chemical pipeline conveying system, comprising: centralized liquid supply system equipment;Several chemical distribution plates;Several transparent PVC boxes, and hollow double-layer pipes;For connecting centralized liquid supply system equipment, chemical distribution plate and transparent PVC box;Hollow double-layer pipe includes transparent PVC pipe and PFA hose, transparent PVC pipe is contained in transparent PVC direct head, PFA hose is contained in transparent PVC pipe, PFA hose diameter is 1-1.5 inch, transparent PVC box is internally provided with by letting box, by letting box includes several adapters, locking nuts and electronic valves, electronic valve is electrically connected with PLC and smoke sensor;Transparent PVC box bottom surface is also provided with several reagent boxes, and reagent box contains reagent that can react with dangerous chemicals to generate smoke.The application can realize super-long chemical transportation turning to prevent pipeline rupture, and prevent chemical leakage.

The invention discloses a feeding and discharging manipulator for a production line, which relates to the technical field of manipulators and comprises a manipulator body, a clamping mechanism mounted at the end of the manipulator body and a first workpiece arranged in an inner cavity of the clamping mechanism. The positioning clamping plate is installed at the end of the manipulator body and used for being connected with the clamping mechanism, the double-layer pipeline is arranged on the lower surface of the positioning clamping plate and can drive the clamping mechanism and the first workpiece to rotate left and right, and a second workpiece and an object placing table for placing the second workpiece are arranged under the first workpiece. A plurality of hidden limiting mechanisms capable of automatically centering and positioning a second workpiece are arranged on the inner wall of the storage table, the first workpiece is guided through a guide groove to achieve staged recovery and rotate leftwards and rightwards for fine adjustment at the same time, dislocation correction is achieved, and before the first workpiece and the second workpiece are installed and connected in a butt joint mode, the second workpiece can rotate leftwards and rightwards. A plurality of hidden limiting mechanisms can be driven to pop up, so that the centering positioning function of the second workpiece is realized, and the efficiency of the whole production line is improved.

The invention discloses a bimetal composite pipe end welding device and method, and relates to the technical field of welding, the bimetal composite pipe end welding device and method comprise a base, a fixing plate and a welding mechanism, the fixing plate is arranged on the top of the base, the welding mechanism is arranged on the inner side of the fixing plate, and the welding mechanism is arranged on the inner side of the fixing plate. The welding mechanism comprises a first motor, cutting machines, a spring telescopic rod, a second welding machine mechanism and a protective barrel plug, the first motor is used for driving the cutting machines to conduct position adjustment according to the size of an actually-welded pipeline, and after the multiple cutting machines cut the outer layer of a section of double-layer pipeline, the argon arc welding machine mechanism on the mounting ring is driven to surround the outer side of the pipeline; the outer layer welding is completed according to the inner layer welding principle, overall welding of the bimetal composite pipe is achieved, the problems of weld cracks and air holes caused by traditional bimetal composite pipe welding are avoided, the welding quality is improved, the production cost is reduced, and the working time is shortened.

The invention provides a multifunctional experimental device and method for simulating a corrosion state in a submarine pipeline, and belongs to the field of pipeline corrosion internal detection. The experimental device comprises an experimental device body, a heating device and a circulating pump, a medium in the experimental device body can be externally heated through the circulating pump, and in other words, the circulating pump can continuously convey the medium heated by the heating device to the experimental device body. The test method comprises a corrosion coupon experiment, a corrosion probe experiment and a double-layer pipe annulus corrosion simulation experiment. When a corrosion coupon experiment and a corrosion probe experiment are carried out, a corrosion probe and a corrosion coupon are respectively inserted into the experiment device main body, and corrosion rate data are continuously monitored and detected for 7 days; when a double-layer pipe annulus corrosion simulation experiment is carried out, wireless wall thickness detectors are sequentially attached to the three clamping grooves, and the average corrosion rate of the wireless wall thickness detectors is based on thickness measurement data of the wireless wall thickness detectors. According to the invention, a plurality of corrosion rate simulation parallel experiments can be simultaneously carried out, the operation is simple, the safety is high, and the controllability is high.

The invention relates to the technical field of oil well exploitation equipment, in particular to an underground coiled tubing capable of controlling the flow of produced liquid. The device comprises a double-layer pipe fitting and a flow control assembly. The motor drives the side frame to slide up and down along the inner wall of the extension plate through the control shaft, then the variable section pipe is driven to move up and down in the inner pipe, when the variable section pipe moves downwards, the area, exposed out of the bottom of the packer, of the square opening is increased, otherwise, the area is reduced, and the flow in unit time is changed by changing the exposed circulation sectional area of the square opening; meanwhile, when the variable fluid moves upwards to reduce or moves downwards to increase the circulation sectional area, the elastic piece is synchronously compressed or stretched to increase or reduce pressure, the pressure balance of the liquid in the first oil cavity is maintained, and the purpose of adjusting the flow is achieved. The conditions of cavitation damage, water hammer vibration and the like caused by remarkable reduction of the pressure in the pipeline can be avoided, and therefore stable operation of the pipeline can be guaranteed while the flow can be adjusted.

The utility model relates to the field of oil pumps, in particular to a centralized high-pressure common rail system. The common rail system comprises a PVC valve, a right cross rail connecting pipe, a left cross rail connecting pipe, a right high-pressure common rail, a left high-pressure common rail, a high-pressure oil pipe A, a high-pressure oil pipe B, a high-pressure oil pipe C, a safety valve and a rail pressure sensor, one side of the PVC valve is communicated with the right high-pressure common rail through the right cross rail connecting pipe, and the other side of the PVC valve is communicated with the left high-pressure common rail through the left cross rail connecting pipe. And a rail pressure sensor is mounted at the end of the right high-pressure common rail. The left high-pressure common rail and the right high-pressure common rail are connected at the rear end of the diesel engine through the left high-pressure common rail and the right high-pressure common rail, so that oil pressure in oil cavities of the left high-pressure common rail and the right high-pressure common rail tends to be consistent; the high-pressure common rail is of a double-layer pipe structure, and the high-pressure oil pipe and the high-pressure common rail are connected and sealed through a ball head. The high-pressure common rail inner pipe is an integral steel pipe, and the high-pressure common rail outer pipe is a sectional steel pipe, so that the high-pressure common rail has better safety and leakproofness.

The invention discloses a powder double-layer suction pipe matched with an upper-opening storage barrel and a method, and relates to the technical field of uranium conversion related equipment. The device is used in cooperation with a storage barrel with an upper opening. The device comprises a double-layer pipe and a material gathering plate, the double-layer pipe comprises an outer pipe and an inner pipe coaxially arranged in the center of an inner hole of the outer pipe, an annular column area is formed between the inner pipe and the outer pipe, and a plurality of feeding holes are formed in the lower end of the inner pipe; the plurality of material gathering plates are annularly and uniformly distributed and fixedly connected to the outer circular surface of the lower end of the outer pipe; a feeding hole is formed in the excircle surface of the lower end of the outer pipe. A powder suction method matched with a storage barrel with an upper opening is used for being matched with a negative pressure system to suck powder materials in the storage barrel with the upper opening, and by being matched with an original eccentric rotation suction method, powder material residues are avoided, and the suction efficiency is improved. The invention provides a powder material suction structure and a powder material suction method which are adaptive to an upper-opening storage barrel based on a technical route of conveying powder materials through a gas path, and the powder material suction structure and the powder material suction method are particularly suitable for efficient and residue-free transfer of UO2 powder in the nuclear fuel preparation process.

The utility model relates to a frame-passing joint and a connecting system thereof. The over-frame joint comprises a flange plate (10), an inner pipe receiving part (20) and an outer pipe receiving part (30), the outer pipe receiving part is concentrically arranged on the outer side of the inner pipe receiving part, an annular space is formed between the inner pipe receiving part and the outer pipe receiving part, and at least one rib part (31) connecting the inner pipe receiving part and the outer pipe receiving part is arranged in the annular space. A first substance with a first phase state and a second substance with a second phase state respectively penetrate through the outer pipe containing part and the inner pipe containing part to flow, the flange plate surrounds the outer pipe containing part and is integrally formed on the outer side of the outer pipe containing part, and at least one connecting hole (11) for connecting the over-frame connector to an installation target is formed in the flange plate. The over-frame connector not only can realize over-frame connection between double-layer pipelines, but also can be suitable for over-frame connection between single-layer pipelines and double-layer pipelines, so that great convenience is provided for a fuel system of an aircraft.

This invention discloses an in-situ instrument insulation device, comprising an outer insulation tube and an inner insulation tube, which are sleeved together to form a cavity structure. This cavity structure is a vacuum double-layer tube structure. A gas chamber sampling tube is disposed within the inner insulation tube. The cavity structure is an internal interlayer structure, which is silver- or copper-plated. A guide plate with guide fan blades is disposed within the inner insulation tube. This invention, by setting a vacuum double-layer tube structure, blocks heat conduction and convection between the outer and inner insulation tubes. Simultaneously, the silver or copper plating of the internal interlayer of the cavity structure further weakens heat radiation between the interlayers, fundamentally blocking heat transfer and achieving insulation, thus significantly reducing heat loss from the heat tracing pipe.

The utility model relates to a pipe fitting end sealing clamp which comprises an end sealing main body and an intercalation assembly which are connected with each other, the end sealing main body comprises a first face and a second face which are opposite to each other, the first face of the end sealing main body and the second face of the end sealing main body are both closed figures with non-hollow interiors, and the intercalation assembly comprises a first end face and a second end face which are opposite to each other. The first end face of the intercalation assembly is connected to the second face of the end sealing body. The area of the second end face of the intercalation assembly is smaller than that of the first end face of the intercalation assembly, and the first projection of the first end face of the intercalation assembly on the second face of the end sealing body is in the second face of the end sealing body. And the second projection of the second end surface of the intercalation assembly on the second surface of the end sealing main body is in the peripheral contour of the second end surface of the intercalation assembly. The pipe end sealing clamp is suitable for end face sealing in the double-layer pipe vacuum glue injection process, effectively prevents leakage of air and glue in the glue injection process, and is simple in structure and convenient to operate.

The utility model discloses an air conditioner connecting pipe with a good noise reduction effect, which relates to the technical field of air conditioner connecting pipes and comprises an inner pipe and an outer pipe. The outer tube is arranged on the outer side of the inner tube in a sleeving manner, and a tubular melamine foam layer is arranged between the inner tube and the outer tube; according to the connecting pipe for the air conditioner, the double-layer pipe structure of the inner pipe and the outer pipe is arranged, the melamine foam layer is arranged between the inner pipe and the outer pipe, melamine foam has excellent sound absorption performance, internal noise can be effectively prevented from being spread out of the pipe, and the noise reduction effect of the connecting pipe for the air conditioner is improved.

The utility model relates to the technical field of double-layer pipe machining, in particular to a double-layer pipe chambering and flanging machine which comprises a base, a base is arranged above the base, the lower end of the base is fixedly assembled with the surface of the base through a screw, a spiral electric heating pipe is further installed at the upper end of the base, and connecting rods are arranged on the two sides of the base respectively. The two sides of the spiral electric heating pipe are fixedly sleeved with side bases respectively. The port of the double-layer pipe is conveyed and is in butt joint with the reaming and flanging die, the pipeline is in sliding cup joint with the smooth section at first, the transition conveying and butt joint effect can be achieved, then under the heating effect, the material of the pipeline is softened, the pipeline is continuously conveyed, the port of the pipeline continues to move and passes through the reaming section, and then the pipeline is continuously expanded. By means of the softening deformation effect, chambering of the pipeline end opening can be achieved, under the softening condition, conveying continues to be conducted, the pipeline end opening makes contact with the edge folding section, and edge folding machining of the pipeline end opening can be completed.

The invention belongs to the technical field of double-layer pipeline deburring, and provides a tool for double-layer pipeline deburring and a using method thereof.The tool comprises a sleeve and a cutting part, the cutting part is fixedly arranged at one end of the sleeve, the inner diameter of the sleeve is matched with the outer diameter of an inner-layer pipe of a double-layer pipeline, and when the sleeve is arranged on the inner-layer pipe of the double-layer pipeline in a sleeving mode, the cutting part is fixed to the inner-layer pipe of the double-layer pipeline. And the cutting piece can be in contact with the outer-layer pipeline of the double-layer pipeline. The sleeve is matched with the cutting part, the inner diameter of the sleeve is matched with the outer diameter of an inner-layer pipe of a double-layer pipeline, the sleeve can be accurately arranged on the inner-layer pipe in a sleeving mode, and the cutting part makes contact with an outer-layer pipeline. During operation, the sleeve is inserted into an inner-layer pipeline, and the handle is rotated to drive the cutting piece to remove burrs, so that various defects of manual filing are avoided, the deburring efficiency and quality are greatly improved, and a solid foundation is laid for subsequent assembling and welding procedures.

The invention belongs to the technical field of pipelines, and discloses a high-temperature-resistant smoke prevention and exhaust air duct which comprises an outer-layer pipe and an inner-layer pipe, the inner-layer pipe is fixed in the outer-layer pipe through a plurality of reinforcing ribs, and the space between the outer-layer pipe and the inner-layer pipe is filled with a fireproof heat insulation core material. A rotating shaft is rotationally connected between the inner walls of the two sides of the inner-layer pipe, an adjusting baffle is fixedly connected to the periphery of the rotating shaft, and one end of the rotating shaft extends to the exterior of the outer-layer pipe and is fixedly connected with a connecting rod. According to the smoke control and exhaust system, the problems that the existing smoke control and exhaust system lacks a flexible air volume adjusting function and is difficult to adapt to the requirements of optimal flow velocity intervals in different fire scenes are solved, the high-temperature resistance is improved through cooperation of a double-layer pipe structure and a fire-resistant heat-insulation core material, and accurate air volume control is achieved through an adjustable baffle, so that the safety and the smoke exhaust efficiency of the smoke control and exhaust system are improved.

The utility model discloses a pipe plugging assembly and a pipe bundle plugging structure of an air dry cooling radiator. The pipe plugging assembly comprises a plug and a plug cap which are integrally formed and made of plastic materials. The plug is provided with a variable-diameter section which is tightened along the direction far away from the plug cap according to a preset taper, and a non-variable-diameter section which is formed at the tail end of the variable-diameter section and extends straightly; the maximum outer diameter of the reducing section is larger than the inner diameter of a channel opening of the water inlet header so that the reducing section can serve as an expansion plug part to be expanded in the channel opening. The outer diameter of the non-variable-diameter section is equal to the inner diameter of a lining pipe of the double-layer pipe bundle so that the non-variable-diameter section can serve as a blocking part to be inserted into a pipe opening of the lining pipe. The utility model provides a pipe plugging assembly and an air-dry-cooling radiator pipe bundle plugging structure, which can thoroughly solve the problem of pipe plugging after leakage of an air-dry-cooling radiator pipe bundle, thereby avoiding the defect of repeated pipe plugging caused by aging of plug parts after the pipe bundle is plugged, reducing the pipe plugging cost and ensuring the pipe plugging effect.

The present application relates to a kind of machining joint and vacuum double-layer pipeline and its preparation method, belong to double-layer pipeline manufacturing technical field, solve the existing conveying pipeline manufacturing cost high, product weight is easy to exceed standard, temperature control effect is not good Problem.Machining joint includes cylindrical body and the protrusion around the part outer periphery of the cylindrical body;Cylindrical body inside is provided with the cavity passing through two end faces;Along the extension direction of cylindrical body central axis, protrusion length is less than the length of cylindrical body, and the both ends of protrusion do not overlap with the both ends of cylindrical body;The both ends of cylindrical body are used to with the inner tube end face of vacuum double-layer pipeline butt joint, the both ends of protrusion are used to with the outer tube end face of vacuum double-layer pipeline butt joint.The vacuum double-layer pipeline method simple, production efficiency high is prepared by using the machining joint of the present application and inner tube, outer tube with corrugated structure is combined.

The heat exchange system comprises a plurality of sleeve units which are arranged in a box body and connected end to end, a temperature transmitting unit and a pressure transmitting unit are arranged at the inlet ends of the connected sleeve units, a temperature transmitting unit is arranged at the outlet ends of the connected sleeve units, and each sleeve unit comprises a first vertical pipe and a second vertical pipe which are arranged in parallel. A transverse pipe allowing cooling liquid to flow through is arranged between the first vertical pipe and the second vertical pipe, and the first vertical pipe, the second vertical pipe and the transverse pipe are all double-layer pipes. The sleeve unit is respectively connected with the temperature transmitter and the pressure transmitter, the temperature transmitter can monitor and control the temperature of hydrogen at the hydrogen inlet and the hydrogen outlet, and the pressure transmitter monitors the pressure change of cooling liquid and senses the pressure of fluid in a cooling water pipeline, so that the problem of unbalanced regulation and control when the pressure is lost is solved; the sleeve units are arranged in the box body, the double doors are reserved at the two ends of the box body respectively, and the overall structure is easy to disassemble, convenient to install and high in practicability.

The utility model discloses a gelling type culture medium pipetting device which comprises an upper adjusting cap, a lower adjusting cap, a lower adjusting cap and a lower adjusting cap, wherein the upper adjusting cap is provided with an upper cavity with a downward opening; the lower adjusting cap is provided with a lower cavity with an upward opening, and the lower adjusting cap is coaxially screwed in the upper adjusting cap, so that the upper cavity and the lower cavity are communicated to form an adjusting cavity; the pressing cap is arranged on the top wall of the upper adjusting cap in a penetrating mode, and the lower edge of the pressing cap is horizontally turned outwards to form a limiting clamping plate sliding up and down along the upper cavity; the taper pipe is a double-layer pipe which is vertically fixed on the bottom wall of the lower adjusting cap in a penetrating manner and is provided with an interlayer in the middle, and a heating resistance wire is arranged in the interlayer of the taper pipe; the suction tube is an elastic bag body arranged in the adjusting cavity, the elastic bag body is provided with an opening communicated with the taper tube in a sealed mode, and the pressing cap applies force to the elastic bag body. The utility model has the advantages that the extrusion height of the elastic bag body is accurate and controllable, so that the accurate liquid suction and injection quantity of the taper pipe is ensured; liquid sucked in the taper pipe can be continuously heated, and the liquid sucked in the taper pipe is effectively prevented from being cooled and solidified.

The present application belongs to the field of fire fighting technology, and particularly relates to a remote fire fighting system and a diesel generator set using the system. The remote fire fighting system comprises: a double-layer pipeline, which comprises: an outer corrugated pipe and an inner corrugated pipe, a sealed chamber is formed between the outer corrugated pipe and the inner corrugated pipe, and the inner corrugated pipe is used for connecting a diesel generator and an oil tank; a gas circulating device, a carbon dioxide fire extinguishing tank, a pressure sensor, a temperature sensor, and a remote control module; the remote fire fighting system and the diesel generator set using the system are characterized in that the double-layer pipeline is arranged in the structure of the outer corrugated pipe and the inner corrugated pipe, so that the sealed chamber is formed between the outer corrugated pipe and the inner corrugated pipe, and when the side wall of the inner corrugated pipe is broken and oil leakage occurs, the sealed chamber is inflated and pressurized to prevent diesel from leaking; meanwhile, the inner corrugated pipe is arranged in the structure of being spliced by a sub-inner pipe and a connecting pipe, and when the oil temperature in the inner corrugated pipe is increased, the connecting pipe can be expanded under stress to reduce the oil pressure.

The utility model relates to the technical field of laboratory condensers, and discloses a novel shockproof condenser which is characterized in that an annular outer condensation pipe is sleeved on the outer side of an annular inner condensation pipe, and an annular gap is formed between the annular outer condensation pipe and the annular inner condensation pipe; the outer side of the annular outer condensation pipe is coated with the vacuum sleeve, and a vacuum cavity is formed between the vacuum sleeve and the annular outer condensation pipe; the water outlet threaded connector is arranged at the inlet ends of the annular outer condensation pipe and the annular inner condensation pipe and communicated with the annular outer condensation pipe and the annular inner condensation pipe. An auxiliary condensation area is formed through the annular gap between the annular outer condensation pipe and the annular inner condensation pipe, cooling liquid flows in the annular outer condensation pipe and the annular inner condensation pipe in parallel, heat exchange is carried out through the double-layer pipe wall and the external environment, the condensation contact area is obviously increased, and the condensation efficiency is improved.

The invention relates to the technical field of heat dissipation of oil-immersed transformers, in particular to a secondary rapid cooling device for an oil-immersed transformer, which comprises an underground water well, a double-layer pipeline structure, a closed fan, a telescopic cooling pipeline and a K-shaped cold air outlet. Constant-temperature cold air in the underground water well is utilized, cold air is introduced into the telescopic cooling pipeline in combination with the closed draught fan, and the cold air is sprayed to the surfaces of transformer cooling fins through the K-shaped cold air outlets to achieve rapid cooling. The heat dissipation efficiency can be remarkably improved, the oil temperature of the transformer is reduced, the operation stability is enhanced, and meanwhile the advantages of convenient installation, energy saving and environmental protection are achieved.

The utility model relates to the technical field of protection tubes, in particular to a flame-retardant power cable protection tube, which comprises a modified polypropylene tube, a chlorinated polyvinyl chloride tube is sleeved on the outer side of the modified polypropylene tube, connecting rings are arranged at the end parts of the modified polypropylene tube and the chlorinated polyvinyl chloride tube, and bolt holes are formed in the surfaces of the connecting rings. Two groups of screws are arranged on the surface of the connecting ring, penetrate through the connecting ring and then are in threaded connection with the end parts of the modified polypropylene pipe and the chlorinated polyvinyl chloride pipe respectively; the double-layer pipeline has the beneficial effects that the double-layer pipeline formed by the modified polypropylene pipe and the chlorinated polyvinyl chloride pipe is adopted, so that the flame-retardant effect is improved, and the compression-resistant effect is improved; and the connecting rings are adopted, so that the modified polypropylene pipe and the chlorinated polyvinyl chloride pipe are connected, and the two adjacent groups of protection pipes are connected.

This utility model relates to the field of gas extraction technology, specifically to a borehole protection structure and extraction device for underground directional bedding gas extraction, mainly solving the technical problem of easy clogging of existing borehole protection pipes in underground directional bedding gas extraction. This borehole protection structure includes a double-layer perforated pipe and a double-layer solid pipe. The double-layer perforated pipe includes an outer perforated pipe and a first inner solid pipe. The double-layer solid pipe includes an outer solid pipe and a second inner solid pipe. During operation, air is blown sequentially through the second inner solid pipe and the first inner solid pipe towards the bottom of the borehole. Coal slag and accumulated water enter between the outer perforated pipe and the first inner solid pipe through the slag inlet hole of the outer perforated pipe, and then, driven by air pressure, are discharged to the outside of the borehole sequentially through the first slag discharge channel and the second slag discharge channel. This effectively avoids clogging of the borehole protection pipe, ensures extraction operation time, improves extraction efficiency, and also avoids the occurrence of abandoned boreholes due to clogging.

The utility model relates to the technical field of fireproof soft connectors, in particular to a fireproof soft connector which comprises a soft connector body, a double-layer pipe sleeve wrapping the periphery of the soft connector body and a heat insulation layer arranged between the double-layer pipe sleeve, the double-layer pipe sleeve comprises an inner pipe sleeve body and an outer pipe sleeve body, and the inner pipe sleeve body and the outer pipe sleeve body are formed by sewing high-temperature-resistant cloth with high-temperature-resistant inner supporting ribs and high-temperature-resistant outer supporting ribs through high-temperature lines. By wrapping the periphery of the soft joint with the double-layer pipe sleeve and arranging the heat insulation layer between the double-layer pipe sleeve, the peripheral end of the soft joint can have better high temperature resistance, the integrity and stability of the soft joint structure can be effectively kept, and according to different contact environments of the inner layer and the outer layer, the soft joint can be prevented from being flattened by suction. The inner pipe sleeve and the outer pipe sleeve can meet corresponding use requirements, the inner pipe sleeve and the outer pipe sleeve are formed by sewing the high-temperature-resistant cloth with the high-temperature-resistant inner supporting rib and the high-temperature-resistant outer supporting rib through the high-temperature lines, the stable supporting effect on the soft connector can be kept, it is guaranteed that the soft connector cannot be flattened through suction under negative pressure, and a guide pipe can be replaced to have the better high-temperature-resistant property.

This utility model discloses a surface-resistant, heat-insulating, and flexible double-layer pipe with anti-condensation properties. It includes an inner delivery pipe and an outer protective pipe. The inner delivery pipe is located inside the outer protective pipe, and a heat insulation layer is formed between them. Several support strips are provided within the heat insulation layer. The inner delivery pipe is fixedly connected to the inner side of each support strip, and the outer protective pipe is fixedly connected to the outer side of each support strip. This utility model's surface-resistant, heat-insulating, and flexible double-layer pipe, with its heat insulation layer and specific vacuum design, effectively blocks heat transfer between the inner and outer layers, significantly reducing condensation on the pipe surface, preventing corrosion, and lowering maintenance costs. The optimized shape of the support strips at the inner and outer connections enhances the connection strength and structural stability of the inner and outer pipes, ensuring heat insulation performance.

The utility model relates to double -walled pipe technical field discloses a high pressure double -walled pipe structure, including inner tube, outer tube and fixed in the double -walled pipe support structure between inner tube and outer tube, and the inner tube is connected fixed through double -walled pipe support structure between the outer tube, and the double -walled pipe support structure includes two groups of connecting flange and connecting pipe structure, and each group of connecting flange is connected and fixed with connecting pipe, and the connecting pipe is in the sleeve inner tube, and the outer tube is connected on the connecting flange. The device is connected and fixed through double -walled pipe support structure each connecting point, is connected through the connecting flange in double -walled pipe support structure, and the inner tube is fixed through the connecting pipe, and the outer tube is connected half pipe and is connected through the connecting flange, and the whole device structure is good in compression resistance, and the stability is strong, and the equipment use safety is higher. The welding ring is arranged in the connecting flange of the device, and the welding of the welding fixed sleeve is convenient in the device installation process, improves the stability of the structure of assembly completion.

The invention provides a double-layer pipe expanded connection quality detection device and detection method, and relates to the technical field of double-layer pipe preparation, the double-layer pipe expanded connection quality detection device comprises a first drawing piece, and a to-be-detected double-layer pipe is used for sleeving the outer peripheral wall of the first drawing piece; wherein the first end of the first drawing piece is provided with a first abutting part which is used for abutting against the end face of an inner-layer pipe at the first end of the to-be-tested double-layer pipe; the to-be-tested double-layer pipe is used for being arranged on the inner circumferential wall of the second drawing piece in a sleeving manner; the first end of the second drawing piece is provided with a second abutting part used for abutting against the outer-layer pipe end face of the second end of the to-be-tested double-layer pipe. Wherein the inner-layer pipe and the outer-layer pipe of the double-layer pipe to be detected are drawn in opposite directions, and expanded connection quality detection is carried out. The double-layer pipe expanding connection quality detection is carried out through the double-layer pipe expanding connection quality detection device, it is ensured that the double-layer pipe with the good expanding connection quality is subjected to bending forming, and relative sliding of the inner-layer pipe and the outer-layer pipe in the bending process is avoided.

The present invention provides a device and method for automatically adding liquid nitrogen and evacuating air in an integrated manner for a superconducting suspension device, which relates to the technical field of superconducting magnetic levitation technology and includes a double-layer pipeline, a superconducting suspension device, and a vacuum pumping device. The double-layer pipeline includes an outer vacuum pipe and an inner liquid nitrogen pipe. The central axis of the liquid nitrogen pipe coincides with the central axis of the vacuum pipe, and a gap is provided between the outer wall of the liquid nitrogen pipe and the inner wall of the vacuum pipe. The superconducting suspension device is located on the side of the double-layer pipeline. The vacuum pipe is connected to the vacuum pumping interface of the superconducting suspension device through a first interface, and the liquid nitrogen pipe is connected to the liquid nitrogen inlet of the superconducting suspension device through a second interface. Through the double-layer pipeline, the present invention realizes the multi-purpose use of one pipe. Liquid nitrogen is filled into the superconducting suspension device through the inner liquid nitrogen pipe. The vacuum layer between the outer wall of the liquid nitrogen pipe and the inner wall of the vacuum pipe serves as the vacuum evacuation and maintenance pipeline for the superconducting suspension device on the one hand, and on the other hand, insulates the liquid nitrogen filled into the superconducting suspension device by the inner liquid nitrogen pipe.

[Problem] To provide a leakage detection device for automatically detecting leakage of a fluid from a buried tank or piping. [Solution] Part of an oil filler pipe 11 is buried underground, and said part is configured as double piping 30 including a first pipe 31 serving as the oil filler pipe and a second pipe 32 covering the first pipe 31. A detection sensor 15 for detecting leakage of an organic solvent is arranged between the first pipe 31 and the second pipe 32. The detection sensor 15 is connected to a leakage detection device 21 of a leakage detector panel 20 via a lead wire 25. In this way, when the organic solvent leaks from the first pipe 31, the leakage detection device 21 detects the leakage by means of the detection sensor 15, causes a buzzer 22 to emit sound, and notifies a person in charge of leakage of the organic solvent.

The utility model discloses a double-layer cover eight-connection pipe which comprises an eight-connection pipe assembly, an inner cover assembly is installed on the top of the eight-connection pipe assembly in an inserted mode, and an outer cover assembly used for covering the eight-connection pipe assembly is installed on the upper surface of the inner cover assembly. The eight-connection-pipe assembly comprises a pipe body and a connecting cylinder, the connecting cylinder is installed at the top of the pipe body in a threaded mode, and a protruding block is installed at the end of the connecting cylinder in a surrounding mode. The inner cover assembly comprises a long plate, a limiting ring sleeve and a connecting ring, the outer cover assembly comprises a connecting plate, the limiting column and the limiting ring sleeve are installed in an inserted mode, and the sealing ring pad is installed in the connecting ring in an inserted mode. Double protection of the inner cover assembly and the outer cover assembly is designed through the double-layer cover, the sealing performance of the eight-connection tube is ensured, the double-layer tube cover is covered after reagent preparation is completed, the film is arranged in the middle of the inner-layer connecting ring, and when extracted nucleic acid needs to be added, only the outer-layer tube cover needs to be opened; then the sample adding gun punctures the thin film in the middle of the inner-layer connecting ring to be mixed with the reagent, and the outer-layer tube cover is covered, so that the operation is convenient.