102 results about "Fluoroplast" patented technology

The utility model belongs to the technical field of detection equipment, and discloses a fluoroplastic heat exchanger leakage detection device, which comprises a heat exchanger pipeline, a detection pipeline is arranged at a pipe orifice of the heat exchanger pipeline, a pressure gauge is fixedly connected onto the detection pipeline, and a connecting assembly is further arranged on the detection pipeline. The connecting assembly comprises a support fixedly connected to the detection pipeline, a lead screw is rotationally connected to the support, a circular ring is connected to the outer portion of the lead screw in a threaded mode, a clamping block is movably connected to the support, a connecting rod is horizontally and fixedly connected between the clamping block and the circular ring, and the clamping block is fixedly connected with a fixed arc ring. A movable arc ring is hinged to one side of the lower clamping block through a hinge piece. According to the utility model, the problem that the maintenance time is increased because the heat exchange tube is inconvenient to connect and seal is effectively avoided.

The utility model relates to the technical field of cables, and discloses a high-strength copper-core silver-plated special high-temperature cable, which comprises a conductor and further comprises a conductor shielding layer arranged on the outer side of the conductor, an insulating layer arranged on the outer side of the conductor shielding layer, and an insulating shielding layer arranged on the outer side of the insulating layer. The inner protection layer is arranged on the outer side of the insulation shielding layer, and an outer protection layer is arranged on the outer side of the inner protection layer; according to the utility model, fluoroplastic (such as PTFE and FEP) is used as the insulating layer, the long-term tolerable temperature can reach more than 200 DEG C, the chemical corrosion resistance is strong, the high-temperature resistance of the cable is improved, the high-temperature-resistant metal braid layer (such as tinned copper) is used as the outer layer to reinforce mechanical protection, the flexible silica gel is used as the inner layer to improve the bending resistance, and the service life of the cable is prolonged. Corrugated grooves are designed in the inner wall of the protective sleeve, so that the heat dissipation area can be increased; the heat conduction filling material boron nitride filling material is embedded in the protection sleeve so that internal heat conduction efficiency can be enhanced and heat radiation efficiency in the cable can be enhanced.

The utility model relates to a head nut technical field, especially a four fluorine outer clothing head nut for fixing fluorine plastic board, including nut body, still including sealing along and installation component, nut body lower extreme fixedly connected with sealing along, nut body outer surface is equipped with a layer of polytetrafluoroethylene outer clothing, and nut body upper end is provided with installation component, the utility model discloses through sandblasting treatment surface, and polytetrafluoroethylene powder is evenly sprayed on the nut body surface, and the dense outer clothing layer is formed through high -temperature sintering, through the high chemical stability and high temperature resistance of polytetrafluoroethylene outer clothing, make the nut service life extension, through filling high -temperature sealant and three millimeter thick soft four fluorine round pad or three millimeter thick high -temperature fluorine rubber pad in the sealing groove, further promote the sealing performance, solved because PTFE board itself welding fusibility just has no PFA effect good, and the welding firm degree is lower, and fluorine plastic cap is easy to crack under the flue harsh environment, causes the corrosion of bolt, leads to the problem of poor sealing.

The utility model belongs to the field of aviation product assembly quality improvement, and relates to a device for assembling a small fluoroplastic sealing ring. Comprising an ejector rod (1), a shaping rod (2), a guide sleeve (3), a shaping block (4) and a valve block (6), a first connecting hole with the diameter being D and a second connecting hole with the diameter being C are formed in the two ends of the shaping block (4), and the guide sleeve (3) is connected with one end of the shaping block (4) through the first connecting hole; the valve block (6) is connected with the other end of the shaping block (4) through the second connecting hole; the shaping block (4) is provided with a variable-diameter hole which is changed from the diameter A of one end to the diameter B of the other end, and the upper end face of the shaping block (4) is provided with a groove used for containing the shaping rod (2); the through hole with the diameter A, the through hole with the diameter B, the through hole of the guide sleeve (3) and the through hole of the valve block (6) are coaxial; the outer diameter of the acting part of the ejector rod (1) is the diameter B. The diameter A is equal to the outer diameter of the fluoroplastic sealing ring (5), and the diameter B is the hole diameter of a mounting hole of the valve block (6).

The application relates to the technical field of electric wire and cable, and discloses a fluoroplastic insulation high-temperature-resistant fireproof cable and a preparation method, the cable comprises a conductor layer, the conductor layer is twisted by multiple copper wires, the conductor layer is coated with a fluoroplastic insulation layer, the fluoroplastic insulation layer is coated with a shielding layer, the shielding layer is a copper-belt woven structure, the shielding layer is coated with an armor layer, the armor layer is woven by stainless steel wires, the armor layer is coated with a sheath layer, and the sheath layer comprises the following components in mass fractions: functionalized ethylene-tetrafluoroethylene copolymer, 50-70 parts by mass. The application constructs an interpenetrating polymer network formed by in-situ crosslinking of a functionalized fluoropolymer and an organic silicon elastomer in the sheath layer, and adopts an energy field gradient response vulcanization process, so that the prepared cable sheath keeps the inherent high-temperature resistance of fluoroplastic, and the flexibility and mechanical strength of the material are improved.

The utility model provides a low-temperature-resistant winding dragging cable, which relates to the technical field of wires and cables and comprises an outer insulating sleeve, conductors distributed in an annular array are arranged inside the outer insulating sleeve, an inner insulating layer is fixedly sleeved outside the conductors, and a moisture-proof layer is fixedly sleeved inside the outer insulating sleeve. By adopting the combination of various adaptive materials such as the outer insulating sleeve made of fluoroplastic and the inner insulating layer made of silicon rubber, the cable can work normally in an extremely low-temperature environment of lower than-40 DEG C, maintains stable electrical insulation and protection performance and the like, and can be used for protecting the cable under the action of external force such as frequent dragging and bending and the like. By means of good flexibility guaranteed by the oxygen-free copper multi-strand stranded conductor, stability of reasonable structure matching of all layers and external protection provided by the thickened sheath, the problems of internal structure damage, conductor breakage and the like can be avoided, it is ensured that the overall performance of the cable is reliable, and the cable can better adapt to low-temperature complex application scenes needing winding and dragging.

The utility model provides a super flexible shielding cable, the cable core comprises a central cable core, a first cable core and a second cable core, the first cable core and the second cable core are sequentially arranged outside the central cable core from inside to outside, the first cable core comprises a control signal line unit and a high frequency communication signal line unit, and the control signal line unit and the high frequency communication signal line unit are alternately arranged. The second cable core comprises a plurality of control signal lines, the control signal line unit, the high-frequency communication signal line unit and the control signal lines respectively comprise a tightly-pressed tinned copper wire conductor and a fluoroplastic copolymer insulating layer arranged on the outer side of the tightly-pressed tinned copper wire conductor, and a first tinned copper wire braid layer is arranged on the outer side of the cable core; the cable can effectively transmit large current and high-frequency signals in a high-temperature environment, the ultrahigh shielding rate can effectively block interference of electromagnetic waves, the stability of transmitted signals is ensured, the flexibility of the cable is improved, the cable has good flexibility and fatigue resistance, and the service life of the cable is greatly prolonged.

The utility model belongs to the technical field of cables, and particularly relates to a reinforced signal transmission cable, which comprises a core body formed by twisting a plurality of thin conductors, and further comprises a reinforcing rib twisted between two adjacent thin conductors at the periphery of the core body, and the reinforcing rib comprises an aramid fiber belt and a fluoroplastic belt; it can be understood that the reinforcing ribs are formed by spirally winding the aramid fiber tapes and the fluoroplastic tapes, and are tightly distributed in gaps between the adjacent conductors in a spiral embedding manner, so that the cable is endowed with excellent tensile and anti-torsion characteristics while the structure is compact; the shielding sleeve with a three-layer composite shielding structure is adopted, so that the overall mechanical strength is synchronously improved on the basis of enhancing the electromagnetic shielding effectiveness; and the outer sheath is structurally reinforced by adding short fibers in the middle layer, and is matched with grooves designed in the surface of the outer layer to form a three-dimensional heat dissipation channel, so that the heat dissipation effect is remarkably improved while the mechanical stability is ensured.

The invention relates to a three-layer structure machine head for electric wires and cables, and belongs to the technical field of electric wire processing machinery, the three-layer structure machine head comprises feeding flanges, a machine head main body, a machine head support, a three-layer ceramic core, a mold group, a control part and a vacuumizing component, the feeding flanges comprise a middle-layer feeding flange, an outer-layer feeding flange and an inner-layer feeding flange, and the three feeding flanges are all provided with heat preservation cotton; the middle-layer feeding flange is connected with the foaming main machine, the outer-layer feeding flange and the inner-layer feeding flange are used for extruding the innermost layer and the outermost layer of an electric wire, and the vacuumizing part is mounted at the machine head main body. According to the invention, by optimizing the machine head structure, especially the taper design of the three-layer ceramic core, the three-layer material of the fluoroplastic wire can be highly concentrically and stably extruded and molded, the processing efficiency and the product quality are obviously improved, meanwhile, the material distribution of each layer is uniform, the interlayer is clear, and the requirement of the fluoroplastic wire for high-quality production is met.

The utility model relates to a waterproof flame-retardant mining cable sheath and a cable, which belong to the technical field of mining cables, and comprise three cable conductors, and the outer sides of the three cable conductors are provided with a cable sheath body. The beneficial effects of the utility model lie in that in the working process, the cable conductors are protected by the insulating layers, so that safe transmission of current can be ensured, the inner sheath provides basic insulation and flexibility, and the modified polyurethane material of the middle layer effectively prevents moisture intrusion and fire accidents through excellent waterproof and flame-retardant properties, so that the cable is suitable for popularization and application. The fluoroplastic material of the outer protective layer provides extra weather resistance and chemical corrosion resistance, long-term stable operation of the cable in a severe environment is ensured, the waterproof performance of the cable sheath body is improved through the effect of the nano silicon dioxide coating, moisture invasion is effectively prevented, and the service life of a cable conductor is prolonged.

The invention relates to a fluoroplastic evaporator, and relates to the field of industrial wastewater zero discharge technology, the fluoroplastic evaporator comprises a placing assembly and an evaporator assembly, the placing assembly comprises a cylinder and two tube plates, and the side wall of the cylinder is provided with an air inlet for steam to enter, a discharge port for steam condensate water to be discharged and other tube ports; the two tube plates and the barrel are coaxially arranged, and a plurality of connecting holes are formed in the tube plates; the evaporator assembly comprises a plurality of tube nests, the tube nests are located between the two tube plates, the two ends of the tube nests penetrate through the connecting holes respectively, and the tube nests are fluoroplastic pipelines, on the premise that the manufacturing cost is not increased and the evaporation efficiency is not reduced, strong acid corrosion resistance and non-stick performance are achieved, the tube nests are not prone to scaling, or organic matter solids or crystal salt are not prone to being attached to the tube nests, and the service life of the tube nests is prolonged. The effects of no production halt maintenance, evaporation efficiency improvement and the like are achieved. Therefore, the device has the economic values of scaling resistance, adhesion resistance, corrosion resistance, production-stop-free maintenance, improvement or enhancement of the evaporation efficiency and prolonging of the service life of equipment through the tube nest.

This invention relates to the field of power cable technology and proposes a cross-linked polyethylene insulated power cable with a fluoroplastic flame-retardant layer. The cable comprises several stranded conductors, each of which is sequentially covered from the inside out with a cross-linked polyethylene insulation layer, a shielding layer, and a fluoroplastic flame-retardant layer. It also includes a filler layer, support frames, an early warning support assembly, and a flame-retardant assembly. A filler layer is disposed between the conductors, and the filler layer is sequentially covered with a wrapping layer, an armor layer, and a sheath layer. Several support frames are spaced apart at the bottom of the sheath layer, each support frame is equipped with an early warning support assembly, and flame-retardant assemblies are disposed on both sides of each support frame. The flame-retardant assemblies are installed on the sheath layer. This technical solution solves the problem in the prior art where it is difficult to detect localized temperature rise in the cable before a fire occurs and to provide early warning, leading to difficulties in effectively suppressing fires.

The invention discloses an ultra-flexible low-temperature-resistant ice-resistant cable for a high-speed railway in an extremely cold region, and the cable is characterized in that nylon wires are added in a conductor structure as a supporting skeleton, and cooperate with small-diameter copper wires to reduce the overall rigidity, thereby achieving ultra-flexibility; the conductor wrapping layer adopts a carbon fiber braid layer, so that the electrical stability is improved while the low-temperature bending fatigue life is prolonged; according to the three-layer gradient functional co-extrusion insulating layer system, nano aluminum oxide is added into a polypropylene material in the inner layer to improve the corona initial voltage, the fluoroplastic FEP aerogel in the middle layer reduces the elastic modulus at the ultralow temperature, and the modified polyurethane elastomer in the outer layer reduces the surface energy and the ice adhesion. Therefore, the ultra-flexible low-temperature-resistant ice-resistant cable for the high-speed railway in the extremely-cold region has the advantages of good flexibility in an extremely-cold environment, high oxidation resistance, high electrical stability, ice resistance and mechanical damage resistance.

The invention discloses a super-lubricating blood vessel puncture sheath tube material tube and a preparation method thereof, and belongs to the technical field of medical instruments. The material pipe is prepared from fluoroplastic, a slipping agent, an antioxidant and a developing agent according to a specific weight part ratio. The core of the invention lies in that the traditional surface coating technology is replaced by material body modification, the thermodynamic incompatibility of the slipping agent and fluoroplastic is utilized, and the slipping agent spontaneously migrates to the inner and outer surfaces of the pipe in the thermal process of extrusion molding to form a stable and uniform nano / micron lubricating film, so that the material pipe is endowed with an ultralow dynamic friction coefficient. The preparation method comprises two working procedures of prefabricated material preparation and pipe extrusion, a unique gradient cooling shaping process is adopted after pipe extrusion, and the migration behavior of a slipping agent is accurately regulated and controlled to optimize formation of a lubricating film. The problems that a lubricating layer of a traditional coating sheathing canal is prone to abrasion, the inner wall is difficult to cover evenly, biological safety risks exist and the process is complex are fundamentally solved, and the prepared material tube has the comprehensive advantages of being durable in lubrication, high in biological safety, reliable in mechanical property, clear in development and low in production cost.

This utility model provides a highly flexible wire, comprising: a cable core, with a sheath on the outside of the cable core; the cable core includes: multiple core wires, each core wire including: a conductor and a fluoroplastic insulation layer disposed on the outside of the conductor; the conductor includes: tinned copper wire, multiple tinned copper wires and / or the bulletproof reinforcing filler wire are twisted together to form the conductor; the sheath includes: a polyester fiber braided mesh disposed on the outermost layer. This invention overcomes the technical bottlenecks of flexible cables in terms of mechanical strength, temperature resistance, and dynamic durability, enabling use in environments with frequent movement, and solving the requirement for high temperature resistance. It ensures the cable's abrasion resistance while enhancing overall flexibility and extending the wire's service life.

The invention belongs to the technical field of conduit connection, and particularly relates to a conduit ball head lossless switching device and a switching method.The conduit ball head lossless switching device comprises an adapter and a cushion block, the adapter is made of a metal material, the cushion block is made of a fluoroplastic material, and the adapter and the cushion block are formed through machining and assembled into a whole; the adapter is provided with a connecting structure matched with a guide pipe outer sleeve nut and a groove used for installing the cushion block, sealing thorns are arranged in the groove, the cushion block is provided with an exhaust hole, and the sealing end, making contact with a guide pipe ball head, of the cushion block is made of fluoroplastic materials. The switching method comprises an assembly step and a disassembly step, the conduit ball head and the metal adapter are isolated through the cushion block, and lossless connection and convenient disassembly and assembly are achieved. The device is simple in structure, high in universality, capable of avoiding damage to the sealing face of the conduit ball head and improving the assembling quality, and suitable for testing scenes such as airtight tests of various conduits.

The application provides a kind of ultra-light stable phase radio frequency coaxial cable, including sequentially arranged from inside to outside in cross-sectional direction inner conductor, insulating layer, outer conductor, shielding isolation layer and outer protective layer;Inner conductor adopts Ag / FEP composite material, and conductive silver layer floats on the surface of fluoroplastic FEP;Outer conductor adopts Ag / PI / Ag composite material, and conductive silver layer is distributed around polyimide to form airtight conductive layer;Shielding isolation layer is woven shielding structure formed by weaving polyimide fiber with surface silver layer, and the surface of single polyimide fiber in it is covered with surface silver layer, and outer protective layer is FEP / PI / FEP outer protective layer or PFA outer protective layer.The ultra-light stable phase radio frequency coaxial cable provided by the application uses the principle of skin effect of high frequency signal, uses composite material containing surface silver layer, and uses non-metallic material with smaller density to replace metal material not participating in signal transmission part, reduces material weight on the basis of ensuring signal transmission demand, and reduces cable weight by more than 50%.

The invention belongs to the technical field of industrial heat exchange equipment, and particularly relates to a device for improving the heat exchange efficiency of a fluoroplastic heat exchanger and a control system.The method comprises the steps that firstly, multi-source data parameters are collected, noise is removed through data preprocessing, missing values are complemented, and then the load interval and the working condition type are accurately judged through a working condition recognition model; outputting standardized working condition characteristic data; then, the target angle and distance of the guide plate are decided in combination with a preset parameter mapping library and executed, the actual value and the target value are compared, and the adjustment action is dynamically corrected; based on the method, the wide-range unit load fluctuation in industrial production can be flexibly adapted, and the problem of adaptation limitation in the traditional technology is effectively solved.

The utility model relates to the technical field of transmission cables, and discloses a high and low temperature resistant transmission cable for an instrument, which comprises a power line, a 1553B data bus for aerospace, a shielding pair twisting group, a single core group, a single-sided aluminum foil wrapping layer, a silver-plated braided shielding layer and a raw material belt wrapping sintering layer, the single-face aluminum foil wrapping layer wraps the power line, the 1553B data bus for aerospace, the shielding twisted-pair group and the single-core group, fluoroplastic insulating materials are adopted to serve as a cable sheath, it is ensured that the cable can still work stably and is not prone to aging or cracking in severe high and low temperature environments, a multi-layer shielding structure is arranged in the cable, external electromagnetic interference can be effectively reduced, and the service life of the cable is prolonged. The signal transmission stability is protected, meanwhile, the double-layer raw material belt wrapping sintering layer is adopted, so that the cable can withstand frequent bending without being broken and is higher in durability, the power line, the 1553B data bus for aerospace, the shielding pair twisting group, the single-core group and other assemblies all adopt high-quality silver-plated copper conductors, and efficient and stable transmission of signals is ensured.

The utility model relates to the technical field of coaxial lines, in particular to a dynamic-use-resistant vehicle-mounted coaxial line, which is characterized in that a fluoroplastic monofilament is spirally wound on the periphery of a central conductor, then an insulating layer, an aluminum foil layer, a braid layer and an outer coating layer are sequentially coated on the periphery, and the fluoroplastic monofilament is spirally wound on the periphery of the central conductor, so that the dynamic-use-resistant vehicle-mounted coaxial line is formed. And the insulating layer is extruded on the periphery of the fluoroplastic monofilament, so that a gap is formed between the central conductor and the insulating layer, the insulation effective dielectric constant is reduced, the torsional strength of the coaxial line is improved, and the use requirement of a dynamic environment is met. The aluminum foil layer sequentially comprises a first aluminum material layer, a first PET layer, a second aluminum material layer, a second PET layer and a second aluminum material layer between the two PET layers from inside to outside, and after the aluminum foil layer is rubbed by the insulating layer and the woven layer in the twisting motion, signal leakage is blocked through the second aluminum material layer between the two PET layers, and therefore it is guaranteed that signals are not leaked.

The utility model belongs to the technical field of pump processing, and discloses a compression-molded fluoroplastic-lined pump shell mold, which aims to solve the problems existing in a pump shell of a fluoroplastic-lined pump in the prior art, and comprises a charging barrel arranged on the inlet side of a pump shell casting, a pressing mold is arranged in the charging barrel, and a core block seat is arranged in the pump shell casting. A volute-shaped core block body is installed on the outer side of the lower portion of the core block base, a bottom die is detachably installed at the bottom of the core block base, an outlet core die is installed on the inner side of an outlet of the pump shell casting, an outlet core die pressing plate is installed on the outlet core die, and a space used for pressing a pump shell lining plastic layer is formed among the pump shell casting, the core block base, the core block body and the outlet core die. The outlet core mold is convenient to manufacture and simple in structure, the core block is tightly attached to the outlet core mold, the outlet core mold and a pump shell casting outlet cannot relatively move, the accuracy of a pump shell outlet mold line is guaranteed, the hydraulic performance of a pump shell is guaranteed, the volute shape of the pump shell and the outlet mold line are in smooth transition, and the flow, lift and efficiency of a pump are guaranteed.

This utility model relates to the field of centrifugal pump impeller processing technology, and proposes a pressing device for a centrifugal pump impeller metal insert, including a cabinet and a metal insert. The metal insert includes a metal impeller and a fluoroplastic upper shell and a fluoroplastic lower shell that match the metal impeller. A cylinder is fixedly installed in the cabinet. The piston rod end of the cylinder is fixed with a sleeve mechanism for sequentially inserting the fluoroplastic lower shell, the metal impeller, and the fluoroplastic upper shell. A base support component is fixed in the cabinet for supporting the metal insert inserted on the sleeve mechanism. This utility model adopts a five-layer vertical linkage structure of cylinder-sleeve mechanism-base support component-molding component-pressing mechanism. Each component forms a precise axial motion guiding system through guide holes and sliding pins. The funnel-shaped design of the sleeve rod group of the sleeve mechanism and the guide hole of the mold plate realizes accurate alignment of the fluoroplastic lower shell, the metal impeller, and the fluoroplastic upper shell, and can also eliminate the coaxiality error of the sleeve rod group.

This invention provides a manufacturing process for fluoroplastic products, belonging to the field of plastic product manufacturing technology, including the following steps: S1, wrapping a polytetrafluoroethylene (PTFE) film tape around the outside of a cylindrical mold to form a PTFE layer of a certain thickness; S2, wrapping a fusible PTFE film tape around the PTFE layer to form a fusible PTFE layer of a certain thickness, which is used to form a barrier layer with the PTFE layer after sintering to improve impermeability; This invention enables the metal mesh sleeve to extrude the fusible PTFE layer after melting, and further causes the metal ring to radially shrink and extrude the fusible PTFE layer, allowing the fusible PTFE layer to flow further into the mesh pores of the PTFE layer and the metal mesh sleeve to fill, enhancing density and bonding strength, especially enhancing the negative pressure resistance and impermeability of the lining layer, and offsetting the adverse effects of thermal expansion and contraction.

This invention provides an automatic control system for a butt welding machine for fluoroplastic pipes. The welding machine includes a welding machine body, a left clamp assembly and a right clamp assembly, a heating plate, and a drive mechanism. The heating plate is divided into a first zone, a second zone, and a third zone according to the diameter from smallest to largest. Each zone of the heating plate is equipped with a heating unit. The automatic control system includes a controller, a first detection unit, a first temperature detection unit, a second temperature detection unit, and a third temperature detection unit. The controller is configured to: activate the heating unit of the corresponding zone based on the pipe diameter and the heating plate zone activation rules; calculate the target temperature of the activated zone based on the standard hot melt temperature of the pipe and the temperature compensation coefficient of each zone; and finally perform independent PID closed-loop temperature control for each zone to achieve precise temperature control of pipes with different diameters during welding, thereby ensuring welding quality.

The invention belongs to the technical field of flue compensation devices, and discloses a fluoroplastic expansion joint for a low-temperature flue and a preparation method of the fluoroplastic expansion joint. The expansion joint comprises a core compensation unit and an external protection unit. The core compensation unit is fixed between the flues, and the outer protection unit wraps the outer side of the core compensation unit and is fixed to the outer walls of the flues. The expansion joint is excellent in low-temperature performance, high in corrosion resistance, reliable in protection performance, good in sealing performance, simple in structure and convenient to maintain.

The utility model belongs to the technical field of optical cables, and discloses a central beam tube type high-temperature-resistant high-strength optical cable, which comprises an optical fiber, a compression-resistant elastic body is sleeved on the periphery of the optical fiber, the optical fiber is tightly wrapped by the compression-resistant elastic body, an inner protection layer is extruded outside the compression-resistant elastic body, a tensile unit is arranged outside the inner protection layer, and the tensile unit is connected with the optical fiber. An inner protection layer is extruded on the periphery of the tensile unit, an outer protection layer is extruded on the periphery of the tensile unit, the optical fibers comprise a plurality of colored optical fibers with different colors, the compression-resistant elastomer is a PBT loose tube, a space between the PBT loose tube and the optical fibers is filled with fiber paste, and the inner protection layer and the outer protection layer are fluoroplastic heat insulation protection layers. The periphery of the optical fiber is wrapped by the high-strength PBT loose tube, the tensile property and the compression resistance are good, the aramid fiber braid layer is arranged between the two fluoroplastic heat insulation protection layers, the tensile property and the bending resistance are improved, and in addition, the heat insulation effect of the two fluoroplastic heat insulation protection layers is better than that of the single fluoroplastic heat insulation protection layer.

A fluoroplastic substrate for high-speed communications has a dielectric loss tangent at 40 GHz of from 0.0001 to 0.0008 and a permittivity at 40 GHz of from 2.0 to 3.2. The substrate includes a quartz glass cloth having a dielectric loss tangent at 40 GHz of from 0.0001 to 0.0008 and a fluoroplastic having a dielectric loss tangent at 40 GHz of from 0.0001 to 0.0005.

The invention relates to the technical field of boiler energy conservation and environmental protection, in particular to a boiler deep waste heat recovery, corrosion prevention and blockage prevention system based on heat pipe-heat pump compounding, which comprises a high-temperature-stage heat pipe heat exchange section and a deep cooling-stage heat pump evaporation section which are sequentially arranged along the flow direction of flue gas, and further comprises an ash removal and corrosion prevention system, the ash removal and corrosion prevention system comprises a high-frequency sound wave ash blower used for cleaning the fluoroplastic heat exchange tube bundle and a liquid collecting and neutralizing device used for collecting and treating acid condensate. A high-temperature section uses a conventional metal material but works in a safe area; the system can safely work in a strong acid condensation environment for a long time by utilizing the natural extreme acid corrosion resistance characteristic of fluoroplastic; and in combination with four anti-blocking designs of non-adhesion of the fluoroplastic light pipes, large-interval arrangement without bridging, high-frequency sound wave soot blowing and online spraying and flushing, the heat exchange surface is ensured to be clean for a long time, the efficient heat exchange performance is maintained, and the maintenance intensity and cost are greatly reduced.

The utility model relates to a photoelectric composite cable suitable for an unmanned aerial vehicle platform. The photoelectric composite cable comprises a wrapping layer formed by wrapping a covering film, an accommodating space is formed in the wrapping layer, a two-core electric unit and a one-core single-mode optical fiber are respectively placed in the accommodating space, and a plurality of aramid fiber filling cabling are distributed in the accommodating space; an insulating layer is distributed on the electric unit, an outer wrapping layer is distributed on the single-mode optical fiber, and the insulating layer, the outer wrapping layer and the covering film are all made of high-temperature-resistant fluoroplastic formed by ethylene-tetrafluoroethylene copolymer; the thickness of the covering film is 0.05 mm, and the total thickness after wrapping is 0.10 mm + / -0.02 mm; the outer diameter of the photoelectric composite cable is 2.2 mm + / -0.1 mm, and the total weight per meter is smaller than or equal to 12 g. Therefore, the whole photoelectric composite cable has better high temperature resistance, can meet high tensile strength under the condition of light weight, can realize low-loss signal transmission, and has better heat dissipation effect.