1522 results about "Thermal break" patented technology

The invention relates to the technical field of cables, and discloses a multi-layer composite wrapped high-temperature-resistant anti-aging cable which sequentially comprises a conductor, an insulating cable core, a shielding layer, an outer insulating layer, a fireproof layer, a heat insulation layer, a buffer cushion layer, an armor layer, an anti-aging layer and an outer sheath layer from inside to outside. The fireproof layer is formed by alternately laminating synthetic mica tapes and ceramic boron silicone rubber tapes, a reliable fireproof barrier is formed, and the heat insulation layer is arranged to achieve efficient heat insulation and stable structure through cooperation of gradient pore nano aerogel, ceramic silicone rubber round rods and phase change capsules. The buffering cushion layer is combined with the composite layer, the aluminum oxide hollow ball array and the composite capsule, so that the mechanical buffering and auxiliary heat insulation functions are achieved; the armor layer is woven by stainless steel fibers, the mechanical protection capability is improved, and the anti-aging layer is of a double-layer structure composed of montmorillonite composite fluororubber and an anti-oxidation layer, so that thermal oxidation aging is delayed.

The invention provides a spacecraft quartz powder heat insulation tile which is prepared by adopting high-purity quartz powder (SiO2) as a main raw material and combining a high-temperature-resistant ceramic fiber reinforcement and a nano aerogel heat insulation layer through a high-temperature sintering process. The heat insulation tile has the following advantages: 1, the heat insulation tile has excellent high temperature resistance, and can tolerate 1600 DEG C high temperature for a long time and tolerate 1800 DEG C instantaneous thermal shock for a short time; 2, repeated use: the structure is stable, and high strength is still kept after multiple thermal cycles; light weight: the density is low (less than or equal to 0.5 g / cm < 3 >), and the load of a spacecraft is reduced; and 4, the thermal conductivity is low (less than or equal to 0.05 W / m.K), and heat transfer is effectively isolated. The method is suitable for thermal protection systems (TPS) of spacecrafts, such as thermal insulation of reentry capsules and rocket engine nozzles.

The invention discloses a multi-layer protection cable resistant to an extreme environment, and belongs to the technical field of cables. The cable is of a seven-layer composite structure design and sequentially comprises a conductor, an insulating layer, a shielding layer, a buffer layer, a waterproof layer, a heat insulation layer and a protective outer layer from inside to outside, and the conductor is made of high-purity oxygen-free copper; the insulating layer is made of a polyimide material and has high temperature resistance, low temperature resistance and excellent insulating property; the shielding layer is composed of a tinned copper wire woven mesh and a high-permeability permalloy foil, and electromagnetic interference is effectively shielded; the buffer layer is made of an elastic rubber material to relieve mechanical stress; the waterproof layer adopts a nanoscale fluorosilicone resin coating and has excellent waterproof performance; the heat insulation layer is made of ceramic fibers and aerogel, and efficient heat insulation is provided; and the protective outer layer is made of a high-strength and corrosion-resistant polyether-ether-ketone (PEEK) material. The cable has excellent high temperature resistance, low temperature resistance, corrosion resistance and electromagnetic interference resistance, is suitable for extreme environments, and ensures stable transmission of electric power and signals under extreme conditions.

The heat accumulating type electric heater comprises a shell and a heat accumulator, a heat preservation and insulation layer is arranged on the inner side of the shell, the shell comprises a first shell section and a second shell section, and the shell is horizontal; the first shell section comprises an inlet section and a diffusion section, and the diffusion section is arranged to be in a conical shape. The diameter of the second shell section is larger than that of the inlet section. The two ends of the diffusion section are connected with the inlet section and the second shell section respectively. The heat accumulator is made of high-temperature-resistant alloy and provided with a plurality of heat exchange holes and heating holes, the heat exchange holes and the heating holes penetrate through the heat accumulator, heating units are arranged in the heating holes, and each heating unit comprises a resistance wire. According to the invention, gas flow heating is realized by adopting resistor direct heating and heat storage, the gas purity is high, and the test accuracy is good. The shell is of a horizontal structure, the length of an outlet pipeline can be reduced, temperature loss can be reduced, the defect that the temperature field is uneven due to the fact that the temperature of the upper portion of the heat accumulator is too high and the temperature of the lower portion is too low in the heat accumulation process can be overcome, and the temperature control precision reaches + / -1 DEG C.

The invention relates to the technical field of wires and cables, and discloses a fire-resistant cable based on an overhead photovoltaic system, a braided ring in a fire-resistant flame-retardant layer is formed by winding flame-retardant crosslinked polyethylene fibers, air circulation is guaranteed by virtue of a large number of pores among ropes, and when the fire-resistant cable is burnt by flame, high-temperature gas enters the space of the braided ring, and then the braided ring is sealed. On the other hand, the liquid drainage rod is pulled through contraction traction force, the piston disc is promoted to extrude the flame-retardant liquid in the storage sleeve, after the liquid is sprayed out through the liquid drainage holes, one part of the liquid directly acts on a flame area for fire extinguishing and flame retarding, and the flame-retardant effect is achieved. Most of the materials are adsorbed and retained by the porous structure of the braided ring, are gradually decomposed at a continuous high temperature to release flame-retardant gas, and react with braided ring fibers to form a liquid-state and solid-state composite heat-insulating layer to fill tiny pores which are still remained after shrinkage, so that the integrity of a cable circuit at the initial stage of a fire disaster is guaranteed.

The utility model discloses a double-conveying direct cooling plate with a spiral capillary channel, the direct cooling plate comprises a structure substrate and a heat exchange cover plate which is overlapped and fixed on the structure substrate, the heat exchange cover plate is provided with a groove, and the groove is sealed by the structure substrate to form a heat exchange flow channel; the groove face of the heat exchange cover plate is provided with a plurality of spiral capillary conveying grooves in the flowing direction of a flow channel, the depth of each capillary conveying groove is 0.1-0.5 mm, and the width of each capillary conveying groove is 0.1-0.3 mm. And the runner is provided with a heat insulation layer on one surface of the structural substrate. According to the direct cooling plate, the spiral capillary channel structure is introduced to the wall face of the flow channel, the contact area of cooling liquid and the wall face is increased, a second conveying mode except the flow channel is provided, and therefore the heat transfer efficiency is remarkably improved. Meanwhile, the design can effectively relieve the formation of an air plug and avoid the occurrence of a heat dissipation dead point so as to adapt to battery packs of different types and powers and meet the temperature control requirements of the battery packs.

The invention relates to the technical field of high-power femtosecond laser manufacturing, and discloses a high-power industrial femtosecond laser water cooling structure and a thermal stability optimization method thereof. Comprising the steps that an adjustable flow resistance valve driven by a shape memory alloy is arranged in a cooling water channel in a machine shell water cooling plate, and a temperature sensor is embedded in a key position of the machine shell water cooling plate; a paraffin-based or metal-based phase change material is filled at the bottom of the heat dissipation chute of the shell water cooling plate; an ultrathin uniform-temperature plate is embedded in the water-cooling plate of the casing, so that heat of local hot spots, such as heat near a reflecting mirror seat, on the water-cooling plate of the casing is quickly diffused to the whole water-cooling plate; bionic guide vanes are arranged in the cooling water channel; an aerogel heat insulation layer is additionally arranged between the machine shell water cooling plate and the outer shell, the machine shell water cooling plate and the outer shell are connected through a titanium alloy connecting piece with a low expansion coefficient, and a flow channel cover plate and the machine shell water cooling plate are flexibly connected through a metal corrugated pipe.

The invention relates to the field of tension and pressure sensors, in particular to a tension and pressure sensor with a compensation function, which comprises an elastic body, a strain gauge, a compensation gauge and a wiring terminal, the strain gauge and the compensation gauge are respectively arranged on the surface of the elastic body, the strain gauge, the compensation gauge and the wiring terminal are electrically connected through a plurality of high-temperature-resistant cables to form a bridge circuit, at least the strain gauge and the compensation gauge are respectively limited in the first heat insulation layer and the protection layer, and the first heat insulation layer is located between the elastic body and the protection layer. At least a first heat insulation layer used for protection, heat insulation, pressure resistance and sealing is used for wrapping a strain gauge and a compensating gauge which are packaged by a polyimide film and can resist the high temperature of 260 DEG C, so that the actual temperature of the strain gauge and the compensating gauge has a remarkable temperature difference with the current environment temperature; the actual temperature of the strain gauge and the compensating gauge is obviously lower than the environment temperature, so that the strain gauge and the compensating gauge are respectively in an ideal temperature range, and the force measurement precision of the pull pressure sensor is ensured.

The invention discloses a multi-channel high-precision three-dimensional microcalorimeter, and belongs to the technical field of microcalorimeters, the multi-channel high-precision three-dimensional microcalorimeter comprises a support block, a furnace body is arranged above the support block, a heat insulation layer is arranged in the furnace body in sequence, a heating cylinder is arranged in the heat insulation layer, a heat uniformizing block is arranged in the heating cylinder, and the heat uniformizing block is arranged in the furnace body. The device comprises a heat uniformizing block, a heat measuring cavity is formed in the heat uniformizing block, a heat uniformizing block temperature sensor is arranged at the circle center of the heat measuring cavity, a plurality of heat measuring channels are arranged in the heat measuring cavity around the circle center of the heat uniformizing block at equal intervals, the distances between every two adjacent heat measuring channels are the same, and three-dimensional thermopiles are arranged on the outer walls of the heat measuring channels in a sleeving mode. The number of the heat measuring channels is at least three. According to the multi-channel high-precision three-dimensional microcalorimeter, multiple channels are arranged, multiple groups of experiments, especially comparative experiments, can be carried out at the same time, the experiment efficiency can be greatly improved, and the research and development progress of scientific researchers is accelerated.

The invention belongs to the field of photoelectric co-packaging, and particularly relates to a photoelectric co-packaging temperature control framework based on an embedded glass-based micro-channel. Independent lower-layer heat dissipation is carried out on a heat-sensitive component optical interconnection chip through an embedded glass-based micro-channel technology, an electric interconnection heat dissipation channel continues to use existing upper-layer heat dissipation, mutual isolation of two heat dissipation channels in the whole common packaging body is achieved, heat dissipation partition is achieved from a new dimension, and thermal crosstalk is avoided; the whole common packaging body dissipates heat at the upper layer and the lower layer, so that the effective heat dissipation area is greatly increased, and the heat dissipation capability of the packaging body is greatly improved; and the guidance quality of the heat dissipation channel is better through material selection and additional arrangement of the heat insulation layer. And a metal film temperature sensor can be additionally arranged, so that the temperature of a component can be monitored in real time, heat management regulation and control can be performed in a targeted manner, the temperature rise of a heating device and the heat contact efficiency between the micro-channels are balanced, and more efficient heat dissipation is realized.

The present invention relates to the field of cable technology, and discloses a flame-retardant and wear-resistant charging pile cable and a preparation method thereof. The charging pile cable prepared by the present invention comprises a cable core, a heat insulation layer, a shielding layer, and an outer sheath layer. The outer sheath layer is made of thermoplastic polyurethane elastomer as the main raw material, with the addition of maleic anhydride grafted POE, reinforcing fillers, and composite flame retardants and other functional additives, so that the cable has excellent flame retardant and wear resistance. Among them, the reinforcing filler utilizes the synergistic effect between hexagonal boron nitride and polyimide containing siloxane segments and long-chain fluorocarbon structures to improve the wear resistance of the outer sheath layer. The composite flame retardant has higher flame retardant efficiency than traditional inorganic flame retardants.

An apparatus for sampling landfill gas from a landfill flowing through a pipe. The apparatus may comprise: an enclosure configured to receive a section of the pipe; a gas sampling port in the section of the pipe; at least one sensor device disposed in a region of the enclosure, the at least one sensor being coupled to the section of the pipe through the gas sampling port; and thermal insulation positioned to retain heat from the section of the pipe in the region of the enclosure. A method of operating a landfill gas recovery system. The method may comprise: flowing gas from a well riser pipe through a sampling subsystem to a collection system; and heating a portion of the sampling subsystem with the gas flowing from the well riser pipe to the collection system.

The invention discloses a preparation method of a tinned copper core fluorinated ethylene propylene insulated cable for aerospace, and relates to the technical field of aerospace cable preparation methods. The preparation method comprises the following steps: S1, preparing a nickel-plated copper core; s2, preparing a heat insulation layer; s3, a composite insulating layer is prepared, the composite insulating layer is composed of a first insulating layer, a second insulating layer and a third insulating layer from inside to outside, the first insulating layer is a fluorinated ethylene propylene layer, the second insulating layer is a polyimide / fluorinated ethylene propylene composite layer, and the third insulating layer is a polyether-ether-ketone layer; s4, preparing a shielding layer; and S5, preparing a protective layer. The invention provides the preparation method of the tinned copper core fluorinated ethylene propylene insulated cable for aerospace, the insulated cable prepared by the preparation method has high performance and high reliability in an extreme aerospace environment, and all key requirements of electrical performance, radiation resistance, mechanical strength and wear resistance are comprehensively met.

The invention relates to the technical field of thermal control of spacecrafts, and particularly provides a high-thermal-stability temperature control structure of a space camera main system, which comprises a first thermal insulation layer, a second thermal insulation layer, a third thermal insulation layer and a truss, and is characterized in that the first thermal insulation layer covers the inner wall of the space camera main system and has high solar spectrum absorptivity and high infrared spectrum emissivity; the second heat insulation layer wraps the outer wall of the space camera main system and has low solar spectrum absorptivity and low infrared spectrum emissivity; a truss is further installed on the outer side of the space camera main system in the circumferential direction, a third heat insulation layer is arranged on the truss, and the third heat insulation layer has the low solar spectrum absorption rate and the high infrared spectrum emissivity. The multi-stage thermal insulation structure is utilized to improve the inhibition capability of the camera main system temperature control structure on the influence of the external thermal environment, and the influence of external heat flow change on the temperature stability of the camera main system is effectively reduced.

The invention relates to the technical field of cables, and discloses a flame-retardant wear-resistant charging pile cable and a preparation method thereof. The charging pile cable prepared by the invention comprises the cable core, the heat insulation layer, the shielding layer and the outer sheath layer, the outer sheath layer is prepared by taking a thermoplastic polyurethane elastomer as a main raw material and adding functional aids such as maleic anhydride grafted POE, a reinforcing filler and a composite flame retardant, so that the cable has excellent flame retardance and wear resistance; wherein the reinforcing filler utilizes the synergistic effect between hexagonal boron nitride and polyimide containing a siloxane chain segment and a long-chain fluoroalkyl structure, so that the wear resistance of the outer sheath layer is improved; compared with a traditional inorganic flame retardant, the composite flame retardant is higher in flame retardant efficiency.

The invention discloses a sodium ion secondary battery with a multi-cavity packaging structure and a thermal runaway protection method thereof, the sodium ion secondary battery comprises a main cavity, a thermal runaway pressure relief channel arranged on one side of the main cavity and a composite protection layer arranged on the outer wall of the main cavity, and the thermal runaway pressure relief channel is filled with a phase change material and a fire extinguishing medium storage bag. The auxiliary cavities are respectively four peripheral sub-cavities and one central sub-cavity, and an independent sodium ion battery cell unit is packaged in each peripheral sub-cavity and each central sub-cavity. The internal temperature of each sub-cavity is monitored through a temperature sensor, an electric isolation module is triggered to cut off a circuit of the sub-cavity, meanwhile, perfluorohexanone gas in a fire extinguishing medium storage bag is released, and a basalt fiber woven layer is activated to be unfolded to form cooling fins. A four-stage thermal runaway protection system is constructed through multi-cavity physical isolation, thermal diffusion delaying of a double-layer thermal insulation layer, cooperative fire control of a phase change material and a fire extinguishing agent, dynamic heat dissipation of a composite protection layer and active response of intelligent sensing and shape memory alloy.

The application discloses a kind of low thermal conductivity high reflectivity five-element co-doped ceramic laser protection coating and preparation method thereof, belong to high-energy laser protection technical field.The protective coating includes the adhesive layer and the reflective heat insulation layer of laminated arrangement, adhesive layer is arranged on the surface of base material, reflective heat insulation layer is arranged on the surface of adhesive layer;Wherein, adhesive layer is formed by spraying one of Ni-Al self-bonding powder, Ni-Mo-Al, NiCrAlY, CoCrAlY and NiCoCrAlY;Reflective heat insulation layer is the ceramic coating of five-element co-doped ZrO2, in ceramic coating, base element is ZrO2, doping component is:Y2O3, Gd2O3, Yb2O3, TiO2 And Ta2O5, after doping, material is single cubic phase structure at 25 ℃-1600 ℃.By multiple oxide doping to ZrO2, the coating can maintain cubic phase at room temperature while having lower thermal conductivity and higher reflectivity, can solve the problems of oxidation reflectivity reduction of metal material, mass loss of ablation material and insufficient heat insulation capacity of heat insulation material in laser protection field, prolong service life.

The invention relates to the technical field of cable manufacturing, and discloses a low-carbon environment-friendly low-voltage fireproof cable which sequentially comprises a cable core, a metal heat transfer layer, a ceramic halogen-free low-smoke heat insulation layer, a metal fire blocking layer and a halogen-free low-smoke outer sheath layer from inside to outside. The cable core comprises a plurality of insulating wire cores and a ceramic halogen-free low-smoke flame-retardant material filled in external gaps of the insulating wire cores, each insulating wire core sequentially comprises a conductor, a high-temperature-resistant mica layer and an insulating layer from inside to outside, the high-temperature-resistant mica layer is tightly coated on the surface of the conductor, and the insulating layer is coated on the surface of the insulating layer. The insulating layer is made of a ceramic silicone rubber material, and the ceramic halogen-free low-smoke flame-retardant material and the ceramic halogen-free low-smoke thermal insulation layer both contain inorganic filler capable of forming a ceramic hard shell at high temperature. According to the cable, by adopting a combined structure of the high-temperature-resistant mica layer and the ceramic silicone rubber insulating layer, the fireproof grade of the cable is improved.

This heat insulation structure of a tank wall includes a tank wall, a plurality of heat insulation panels, an interlayer heat insulation material, and a soft material. The tank wall defines an accommodation space for cryogenic fluid. The heat insulation panels are arranged on the outer periphery of the tank wall and each include an inner first heat insulation layer and an outer second heat insulation layer that have mutually different heat insulation performances. The interlayer heat insulation material is disposed between: the second heat insulation layer of one of the heat insulation panels that are adjacent when arranged on the outer periphery; and the second heat insulation layer of the other of such heat insulation panels. The interlayer heat insulation material is disposed in a state of being divided from the foregoing second heat insulation layers. The soft material is interposed between the interlayer heat insulation material and the second heat insulating layer.

The invention discloses a high-low temperature heat storage single-tank device with a composite partition plate. The problems that an existing single-tank heat storage system is thick in thermocline, single in partition plate performance, poor in disturbance rejection and the like are solved. The device comprises a cylindrical tank body, a composite partition plate system, a driving mechanism, a matched pipeline and a heat exchange system, the composite partition plate is composed of a high-temperature phase-change material, a middle heat insulation layer and a low-temperature phase-change material, heat transfer between high-temperature media and low-temperature media is restrained through a thermal delay mechanism, and the dynamic disturbance resistance is enhanced through the movable partition plate. The device can reduce the thickness of the thermocline, improve the heat storage efficiency and stability, reduce the driving energy consumption and cost, is suitable for the scenes of solar thermal power generation, industrial waste heat recovery, ship heat storage and cold storage and the like, and can provide continuous and stable clean energy.

The invention discloses an ultraviolet-resistant and high-temperature-aging-resistant photovoltaic cable structure which comprises a cable conductor, and a buffer layer, an insulating layer, a shielding layer and a sheath layer which are sequentially arranged on the outer side of the cable conductor. The insulating layer is formed by co-extruding a heat-conducting buffer layer, a main insulating layer and a reflection isolating layer, and the heat-conducting buffer layer is provided with a heat-conducting channel along the axial direction; the shielding layer comprises a main body shielding layer and a thermal insulation layer. Silver-plated copper wires are embedded in the thermal insulation layer. Lotus-leaf-like bionic protrusions are arranged on the outer surface of the sheath layer, and a shape memory polymer film is embedded in the sheath layer. The cable conductor is made of high-purity oxygen-free copper and is spirally twisted, a ceramic composite coating is coated outside the cable conductor, and the buffer layer is a polytetrafluoroethylene film. According to the structure, through cooperation of multi-layer composite design and functional materials, the effects of rapid heat dissipation, improvement of temperature resistance and aging resistance, effective blocking of ultraviolet rays, enhancement of structural stability and the like are achieved, the problems that an existing photovoltaic cable is poor in weather resistance, insufficient in heat conduction and prone to structure failure are solved, and the photovoltaic cable can be widely applied to outdoor scenes such as photovoltaic power stations and the like.

A door / window frame structure for making door / window casing such as doors and / or windows intended to be anchored to a supporting wall, said structure comprising at least one metal end element (2) suited to define the external surface (3) of the door / window frame and a substantially straight insulating element (4) suited to promote thermal insulation between the environments respectively located inside and outside with respect to the door / window frame structure. At least one pair of straight metal profile (13) is provided, which have a first end (16) intended to be directly coupled with the insulating element (4); at least one of the profiles of said pair has a second end (19) suited to be directly anchored to the metal end element (2).

An environment localizing barrier, such as a heat retaining barrier, is provided having a flexible elongate, a magnet, and one of a magnet and a magnetizable component. The flexible elongate panel has a pair of opposed ends and comprising a thermally insulative layer and an exposed radiant layer affixed to an inner surface of the thermally insulative layer. The magnet is provided proximate one end of the panel at an elevational location. The one of a magnet and a magnetizable component is provided proximate another end of the panel at the elevational location and is configured to mate in magnetic attraction with one another to affix opposed ends of one or more adjacent panels together into a thermal barrier. A method is also provided.

The invention discloses an efficient passive heat exchange system for high-power steady-state operation of a fusion reactor. The system comprises a first wall component, a vacuum heat conduction pipe assembly, an array fin and a heat exchange assembly. The heat conduction pipe assembly comprises a heat conduction pipe shell, a gradient pore layer and a vacuum heat insulation layer and is divided into a heat absorption section, a heat insulation section and a heat exchange section in the main machine along a heat transfer path. And the average pore diameter of the gradient pore layer is gradually increased from the heat absorption section to the heat exchange section in the host. In the heat absorption section in the main machine, a heat conduction pipe shell is connected with a first wall component, and a low-boiling-point working medium in the heat conduction pipe shell is vaporized to take away fusion heat; in the heat insulation section, a vacuum heat insulation layer is arranged outside the heat conduction pipe shell to ensure that heat is effectively transferred to the heat exchange section; in the heat exchange section, a heat conduction pipe shell and an array fin are connected and arranged in a heat exchange assembly, and a gaseous working medium in the heat conduction pipe shell is liquefied after being cooled by a cooling medium disturbed by a spoiler in the heat exchange assembly and flows back to the heat absorption section in the main machine through a gradient pore layer. The system is efficient in cooling and simple in structure.

The invention discloses a photo-thermal composite desalination membrane with an enhanced MOF (Metal Organic Framework) heat insulation layer and a preparation method. The membrane comprises a porous support layer, an NH2-UiO-66 heat insulation middle layer and a PVA-GO photo-thermal separation layer, wherein the NH2-UiO-66 heat insulation middle layer grows on the surface of the porous support layer in situ; and the PVA-GO photo-thermal separation layer is sprayed on the surface of the heat insulation middle layer and is subjected to photo-thermal induced crosslinking. The preparation method comprises the following steps: firstly, successfully growing an NH2-UiO-66 nano heat insulation layer with a uniform granular structure on the surface of a SE / PMIA membrane by an in-situ growth method, then successfully spraying a PVA-GO solution to the surface of the NH2-UiO-66 (at) SE / PMIA membrane by a spraying method, and successfully preparing the photo-thermal composite desalination membrane PVA-GO (at) NH2-UiO-66 (at) SE / PMIA by utilizing a photo-thermal effect. According to the photo-thermal composite desalination membrane, on the basis of realizing efficient photo-thermal conversion to drive cross-linking of the separation layer, the permeability and the separation performance are further improved, and the membrane has excellent performance in actual seawater desalination treatment.

The invention discloses a liquid-gas phase change flexible actuator based on solid-liquid phase change regulation and control. The actuator comprises a strip-shaped driving layer, a heat insulation layer and a variable stiffness layer which are tightly stacked in sequence, and every two adjacent layers of the driving layer, the heat insulation layer and the variable stiffness layer are fixedly connected; the driving layer is driven to deform by driving the heating wire, the rigidity-variable layer adjusts the rigidity of deformation at different positions of the driving layer through the rigidity adjusting and controlling heating wire, deformation and adjustment of any shape of the liquid-gas phase change flexible actuator are achieved through cooperation of the driving layer and the rigidity-variable layer, and therefore different working modes are achieved. According to the liquid-gas phase change flexible actuator based on solid-liquid phase change regulation and control, repeated and reversible regulation and control deformation of the actuator can be achieved, and the liquid-gas phase change flexible actuator has the advantages of being diversified in deformation form, high in response speed and low in energy consumption for keeping deformation and has a large application prospect.

The invention relates to the technical field of mine blasting, and discloses a high-temperature blasting drilling multi-layer thermal insulation charging device for strip mines, which comprises a multi-layer thermal insulation sleeve, a temperature monitoring module, an active cooling module and a quick release mechanism, the multi-layer thermal insulation sleeve comprises a phase change heat absorption layer, and an aerogel thermal insulation layer is fixedly mounted on the outer wall of the phase change heat absorption layer; a metal reflecting layer is fixedly installed on the outer wall of the aerogel heat insulation layer, the multiple layers of heat insulation sleeves are arranged, the high temperature of the external environment is effectively isolated through the multiple layers of structures of the multiple layers of heat insulation sleeves, internal explosives are protected against the influence of the high temperature, and the phase change heat absorption layer utilizes the phase change heat absorption characteristic of a paraffin-graphene composite material; a large amount of heat is absorbed and stored, temperature rise is effectively slowed down, the aerogel heat insulation layer further blocks heat transfer due to extremely low heat conductivity and excellent heat insulation performance, the metal reflection layer can effectively reflect solar radiation and heat radiation in the surrounding environment, and heat absorption is reduced.

The present application relates to overhead cable technical field, especially it relates to a heat dissipation and humidity control overhead cable, in order to solve the existing cable only adopts the passive resistance way of simple heat insulation layer, ultimately leading to reduce the effect of cable heat dissipation, the present application introduces the outside air into the cooling cavity through the rectangular groove on the surface of the armor layer, cooperates with the inclined baffle, blocks the rainwater at the same time, utilizes the coolant in the low temperature auxiliary coolant cavity, when the cable core generates heat and transmits the heat to the insulation layer, the spiral pipe and the spiral fin closely attached to the outer surface of the insulation layer will absorb the heat, and the coolant in the aluminum spiral pipe will cool the spiral fin and the insulation layer, since the coolant in the liquid cavity always keeps low temperature, and the coolant in the liquid cavity and the coolant in the spiral pipe are connected through the L tube, at this time, the coolant in the spiral pipe can also keep low temperature, ultimately improves the effect of cable core heat dissipation.

The invention relates to the technical field of cables, and provides a cable connection repairing method, a cable comprises a cable core, a first metal shielding layer and a second metal shielding layer, and the position, corresponding to the position between the first metal shielding layer and the second metal shielding layer, of the cable core is a shielding layer missing area; the cable connection repair method comprises the following steps: heat insulation treatment: arranging heat insulation layers between a first metal shielding layer and a cable core and between a second metal shielding layer and the cable core; coating treatment: coating a third metal shielding layer in the shielding layer missing region, and overlapping two ends of the third metal shielding layer with the first metal shielding layer and the second metal shielding layer respectively; and welding treatment: respectively welding and fixing the overlapping position of the third metal shielding layer and the first metal shielding layer and the overlapping position of the third metal shielding layer and the second metal shielding layer at the position corresponding to the heat insulation layer. According to the arrangement, when the third metal shielding layer is welded and fixed, the heat insulation layer can isolate heat generated by welding, so that the cable core can be prevented from being damaged by high temperature.

The invention provides a high-speed aviation bearing testing machine for simulating a high-temperature environment, and belongs to the technical field of high-temperature bearing testing. The external annular heating cavity and the internal high-temperature heating cavity are symmetrically arranged, high-temperature gas is guided in in two directions, and cooperative temperature control of the double heating cavities is achieved; a physical isolation layer is formed by the inner side spacing cover and the end face heat insulation cavity, so that lubricating oil is prevented from being in contact with high-temperature gas; the internal and external high-temperature heating cavities are physically isolated from the bearing tool through the heat insulation layer, so that heat conduction is prevented from interfering with measured data. The device comprises a machine base, a base and an upper cover, the base and the upper cover are fixedly installed on the machine base, the upper cover and the base jointly form a closed cavity wrapping a test tool, the device further comprises a connecting shaft, an external annular heating cavity, a tested bearing assembly and an internal high-temperature heating cavity, and the connecting shaft is inserted into the closed cavity; an external annular heating cavity is formed in the right side area of the tail end of the connecting shaft, and an internal high-temperature heating cavity is formed in the axis area of the connecting shaft.