81 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.

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 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 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 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.

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.

[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.

The utility model relates to the field of paper pulp processing, and discloses a steam explosion device for processing rice straw pulping, which comprises a tank body and a tank cover hermetically fixed at the upper part of the tank body, the tank cover is connected with a feed pipe, a feed valve is arranged on the feed pipe, the bottom of the tank body is connected with a discharge pipe, and a discharge valve is arranged on the discharge pipe; a double-layer pipe is fixed in the middle of the tank cover, and a plurality of air outlets are formed in the bottom of the double-layer pipe; a rotating shaft is sleeved with the double-layer pipe, the upper end of the rotating shaft is connected with a motor driving the rotating shaft to rotate, the motor is fixed to the tank cover, a stirring part is fixed to the lower extending end, penetrating through the double-layer pipe, of the rotating shaft, and the air outlet hole faces the stirring part. Uniform contact between steam and rice straw is achieved, it is guaranteed that materials are heated evenly, the fiber separation effect is improved, and the quality and efficiency of rice straw pulping are improved.

An objective of the present invention is to provide a pipe through which fluids can flow, in which thermal insulation in a space between an inner wall and an outer wall is achieved at low cost and high performance. The thermal insulation pipe of the present invention is a thermal insulation pipe formed by a double wall pipe of an inner pipe and an outer pipe. A thermal-insulating material to be filled in a space between the inner pipe and the outer pipe is made from an aerogel having a three-dimensional network structure with a framework constituted by a cluster of aggregation of primary particles. The thermal-insulating material includes fine particles having a three-dimensional network structure with a framework of the primary particles. A preferred form of such a thermal-insulating material is weakly bonded aerogel ultrafine particle generated by crushing at ultra-high speed a low-binding ultrafine aerogel generated from an aerogel with aging conditions during manufacturing process set to a low temperature and short time period.

The utility model relates to a rotary opening and closing valve of a tubular conveyor, which comprises an inner tube and an outer tube, the inner tube is rotatably sleeved in the outer tube, and the inner tube and the outer tube are coaxially arranged; a first discharging opening is formed in the outer side wall of the inner pipe, a second discharging opening is formed in the outer side wall of the outer pipe, a driving assembly is further fixedly installed on the outer side wall of the outer pipe, the driving assembly is in transmission connection with the inner pipe and enables the two discharging openings to be vertically aligned, a conveying assembly is further arranged in the inner pipe, and a gap is reserved between the conveying assembly and the inner wall of the inner pipe; the double-layer pipeline staggered arrangement mode is adopted, material leakage is prevented, in the discharging process, only the inner pipe needs to be driven to rotate, discharging work can be completed, the problem of material accumulation caused by dead angles can be completely avoided, the discharging port in the pipeline body is utilized by the discharging portion, and the discharging effect is good. Therefore, the discharging speed can be directly controlled by controlling the conveying assembly in the inner pipe, and the stability of the whole discharging structure is greatly improved.

According to the safety gas pipe and the valve, the double-layer pipelines are adopted, low air pressure or high air pressure is formed between the double-layer pipelines by means of air exhaust or air inflation, when no leakage occurs in the two layers of pipelines, the formed low air pressure or high air pressure can be kept for a long time, and if any one of the two layers of pipelines leaks, the safety gas pipe is not damaged. The formed low-pressure value or high-pressure value is the same as or close to the external atmospheric pressure value, so that the driving part closes the ventilation pipeline or makes a sound to remind a user to check the air tightness of the pipeline under the elastic driving, the probability of high-flow or low-flow gas leakage can be effectively reduced, and the life and property safety of people is protected.

The invention discloses a helium recovery system and method in optical fiber production, a pressure sensor arranged in a buffer tank in the system and a proportioning valve form interlocking control, and stable control of gas collection flow is realized by monitoring the pressure in the buffer tank in real time and automatically adjusting the opening degree of the proportioning valve; and system fluctuation caused by too large or too small flow is avoided, and the stability and the automation level of the recovery process are improved. A double-layer tubular heat exchanger structure is adopted, low-temperature nitrogen from the heat exchanger is used for pre-cooling raw material gas, the temperature of gas entering the cold box is remarkably reduced, the consumption of follow-up liquid nitrogen is reduced, meanwhile, the loss of cooling capacity is further reduced by adopting a vacuum heat preservation pipeline, and the energy efficiency of the system is improved.

The utility model relates to a cleaning device for a first hot box of an elasticizer. The cleaning device comprises a water pump, a positive and negative pressure dual-purpose air pump, a waste water collecting box, a cleaning liquid water box, a double-layer pipe, a collecting cover, a cleaning head, a pipe I, a pipe II and a pipe III, the wastewater collecting tank is used for collecting wastewater; the cleaning fluid tank is used for storing cleaning fluid; the double-layer pipe comprises an inner-layer pipe and an outer-layer pipe; the inner-layer pipe is located in the outer-layer pipe, and a gap exists between the inner-layer pipe and the outer-layer pipe. A through hole I, a through hole II and a through hole IV are formed in the upper part of the wastewater collecting tank; a through hole III is formed in the upper part of the cleaning liquid water tank; a through hole V is formed in the collecting cover; one end of the pipe I is connected with the positive and negative pressure dual-purpose air pump, and the other end is connected with the through hole I; when the positive and negative pressure dual-purpose air pump rotates forwards, the positive and negative pressure dual-purpose air pump conveys air, and when the positive and negative pressure dual-purpose air pump rotates backwards, the positive and negative pressure dual-purpose air pump sucks air; the cleaning head is of a geometric structure with the hollow interior. According to the utility model, cleaning and waste liquid collection are carried out synchronously, and meanwhile, the hot box is cleaned without dead angles.

The utility model discloses a socket crimping type double-layer pipe joint and a pipe connecting structure, and belongs to the technical field of pipeline connection, the pipe connecting structure comprises a pipe and a socket crimping type double-layer pipe joint, the socket crimping type double-layer pipe joint comprises a connector, the connector comprises an outer end and an inner end, the outer end of the core sleeve is provided with a socket crimping ring groove formed by the shell and the core sleeve, a special-shaped sealing ring is arranged in the socket crimping ring groove and comprises a sealing ring body and a radial flange integrally formed at the end of the sealing ring body, the core sleeve is fixedly sleeved with the sealing ring body, and the radial flange is located at the bottom of the socket crimping ring groove. The spigot-and-socket gap is formed between the sealing ring body and the shell, the end of the pipe is inserted into the spigot-and-socket gap and abuts against the radial flange, the pipe and the spigot-and-socket compression joint type double-layer pipe joint are sealed and fixed through a compression joint tool, the problems that the sealing ring is extruded and disengaged from a compression joint port and sealing fails are solved, and the spigot-and-socket compression joint type double-layer pipe joint has the advantage of being high in sealing performance.

A kind of methanol dual-fuel generator return pipeline double-wall pipe annular area leak-proof safety system, including pressure reducing valve, manual stop valve, bleeder module, stop check valve, methanol dual-fuel generator, stop check valve, bleeder valve, safety valve, manual stop valve, balance valve, terminal bleeder valve.The pressure reducing valve is used to reduce 13bar nitrogen to 2bar, make 2bar nitrogen fill annular area, the bleeder module is used to connect the connection between annular area and double-wall pipe inner tube.Manual stop valve is used to manually purge the methanol leaked in annular area, terminal bleeder valve is used to access the methanol liquid remaining in annular area into portable bleeder tank.The present application can quickly solve the problem of methanol generator double-wall pipe annular area leak in safety area, adopt closed measures to remove methanol in annular area, realize quickly emptying methanol in annular area, with simple design, easy operation, safety explosion-proof characteristics.

The application relates to the technical field of double-layer pipe and specifically discloses a polyethylene double-layer pipe which comprises an inner-layer pipe and an outer-layer pipe with staggered end faces, a support fixedly connected between the inner-layer pipe and the outer-layer pipe, a flange plate fixedly connected to the outer end of the outer-layer pipe, and flange sheets arranged at the side end of the flange plate; a plurality of ventilation grooves are arranged on the support, an arc-shaped groove is arranged at the outer end of the support, and a detection mechanism is arranged on the arc-shaped groove. The polyethylene double-layer pipe has the advantages that when the inner-layer pipe and the outer-layer pipe are connected, gas is not easy to directly leak from the inside of the inner-layer pipe to the outside of the outer-layer pipe, the sealing performance is good, the outer-layer pipe is connected and fixed through a pair of flange sheets by bolts and nuts, the connection is convenient and flexible, the installation efficiency of the double-layer pipe is improved, and when gas leaks from the inside of the inner-layer pipe to the outside, the gas can be detected, so that the gas is prevented from being further leaked to the outside of the outer-layer pipe.

The utility model discloses a large-displacement PVC (polyvinyl chloride) drainage pipe with a noise reduction effect, which belongs to the technical field of PVC drainage pipes and is characterized by comprising two PVC pipe main bodies, a corrugated pipe is arranged between opposite sides of the two PVC pipe main bodies, the front side and the rear side of the corrugated pipe are connected with connecting components, and the connecting components are connected with the PVC pipe main bodies. The inner wall of the connecting assembly is in close contact with the surface of the PVC pipe main body; the PVC pipe body comprises an inner pipe body and an outer pipe body, a plurality of connecting strips are arranged between the opposite sides of the inner pipe body and the outer pipe body, a plurality of reinforcing blocks are arranged between the opposite sides of every two adjacent connecting strips, the PVC pipe body is designed to be of a double-layer pipe wall structure, and the space between the PVC pipe body and the outer pipe body is filled with the sound absorption material, so that the sound absorption performance of the PVC pipe body is improved. Therefore, when noise sound waves generated in the drainage process are transmitted in the pipe, the sound absorbing material on the outer layer can absorb and reflect part of the sound waves, and the strength of outward transmission of the noise is reduced.

The invention discloses a hollow double-layer pipe electric melting connection pipe fitting and a connection method, and relates to the technical field of pipeline connection, the hollow double-layer pipe electric melting connection pipe fitting comprises a pipe fitting main body, the pipe fitting main body comprises an outer pipe fitting and an inner pipe fitting, the outer pipe fitting is provided with an outer pipe resistance wire and is welded with the outer pipe body through the outer pipe resistance wire, and the inner pipe fitting is provided with an inner pipe resistance wire; the inner tube is welded with the inner tube body through the inner tube resistance wire; a plurality of middle pieces are fixedly arranged on the outer pipe fitting, a fixing ring is fixedly arranged on the inner pipe fitting, and the middle pieces are fixedly connected with the fixing ring; the binding post, the outer tube resistance wire and the inner tube resistance wire are connected in series, the inner tube and the outer tube are welded at the same time, the inner tube and the outer tube are connected through the multiple middle pieces, the strength of the welding position of the tube is guaranteed while hollowness is kept, the inner tube and the outer tube are effectively supported by arranging the supporting assembly, and the welding quality of the inner tube and the outer tube is improved. And the stability between the inner pipe body and the outer pipe body is improved.

The invention is suitable for the field of heating, ventilation and air conditioning, and provides a modular assembly type integrated air pipe of a heating, ventilation and air conditioning system, and the modular assembly type integrated air pipe can be prefabricated in a factory and quickly assembled on site. The air pipe module comprises a double-layer pipe body and a hanging bracket assembly, is filled with a foaming heat preservation material and is provided with an integrated sensor, a micro turbine generator and a wireless data acquisition transmitter. In addition, the invention further provides a construction method based on the building information model (BIM). Through structural design and process improvement, the air pipe sealing performance and the heat preservation performance are guaranteed, and meanwhile the construction efficiency, the engineering quality and the intelligent operation and maintenance level of an air pipe system can be improved.

This application proposes a double-layer PE pipe anti-slip connection structure, including a connecting pipe body and a protruding pipe body sleeved on the outside of the connecting pipe body, for connecting two double-layer PE pipes or connecting one double-layer PE pipe and a single-layer pipe. In use, the inner layer of the double-layer PE pipe is connected to the connecting pipe body, and the outer layer or single-layer pipe is connected to the protruding pipe body, thereby avoiding collision or slippage between the inner layer and the outer layer.

The invention relates to the technical field of high-temperature fluid conveying of a molten salt reactor and an energy storage system, and discloses a sleeving type double-layer pipeline telescopic sealing device suitable for the high-temperature molten salt reactor and the energy storage system. The device comprises an outer pipe and an inner pipe assembly, wherein the inner pipe assembly is coaxially arranged in the outer pipe to form an annular heat insulation space; the inner pipe assembly comprises a first inner pipe and a second inner pipe which are connected in a sleeved mode, and a fit clearance is formed in the sleeved area. And the fit clearance is provided with a multi-stage structure to form a zigzag flow path, so that the high-temperature medium generates cooling, viscosity improvement and / or phase change by utilizing a temperature gradient, and dynamic sealing is realized. The technical problem that thermal expansion compensation and dynamic sealing of the high-temperature pipeline of the molten salt reactor are difficult to consider at the same time is solved, controllable leakage is achieved while large-amplitude axial thermal expansion compensation is allowed, sealing elements prone to being damaged are not needed, and the sealing device is high in reliability, long in service life and suitable for high-temperature fluid conveying scenes such as a high-temperature molten salt reactor nuclear energy system and an energy storage system.

The utility model relates to the technical field of para-aramid production, in particular to a para-aramid polymerization solvent system conveying device. And the para-aramid polymerization solvent system is conveyed to the polymerizer through the conveying assembly. The conveying assembly comprises a pump arranged at the front end of the conveying assembly and used for providing power for conveyed materials; the conveying pipeline is connected with an outlet of the pump and an inlet of the polymerizer, the conveying pipeline is a double-layer pipeline, the inner layer of the conveying pipeline is used for conveying materials, and the interlayer of the conveying pipeline is communicated with an external refrigerant source or a heating medium source and used for refrigerating or heating the materials in the conveying pipeline. When the conveying pipeline is blocked, a heating medium is input into the interlayer of the conveying pipeline to heat materials in the conveying pipeline, the materials are dissolved or washed clean through flowing of the materials in the pipeline, and the pipeline is dredged under the condition that the pipeline is not disassembled.

The invention relates to the technical field of membrane wall boilers, in particular to a low-nitrogen type integrated membrane wall incineration boiler which comprises a base, a boiler body is horizontally and fixedly installed at the top of the base, a feeding module is horizontally arranged in the boiler body, and the feeding module is used for conveying a combustion medium into the boiler body. The two ends of the feeding module extend out of the boiler body. Due to the fact that the medium pipe B penetrates through a combustion core area in the boiler body, heat exchange media circulating in the medium pipe B can rapidly absorb redundant heat of the combustion core area, the situation that a high-temperature oxygen-enriched environment is formed due to the fact that local temperature in the boiler is too high is avoided, then sharp increase of nitric oxide is restrained, and the double-air-pipe structure can effectively prevent the overall high-temperature oxygen-enriched environment from being formed in a hearth. Generation of thermal nitric oxide is inhibited from the combustion working condition regulation and control level, airflow supplemented into the sleeve flows in the gap of the double-layer pipeline in the extending direction of the medium pipe B, the triple effects of heat exchange, buffering and cooling are achieved, and efficient operation of a heat exchange circulating system is guaranteed.