14605 results about "Thermal insulation" patented technology

The invention discloses an electromagnetic heating and heat preservation system for a wind power blade girder plate pultrusion die, and relates to the technical field of thermal field regulation and control, comprising the following steps: activating an electromagnetic coil array to generate an alternating magnetic field, synchronously starting a heat preservation layer device, and triggering a gradient heating mode when the temperature of the die reaches a preset threshold value; a mold temperature field is monitored in real time, the power of an electromagnetic coil and parameters of a heat preservation layer are dynamically adjusted, a target temperature gradient is established, an electromagnetic heating device and a mechanical traction device are linked in the pultrusion process, and heat dissipation control is triggered according to the material flowing state; and after heat dissipation control is completed, the main power source is cut off, the mode is switched to the waste heat recovery mode, mold waste heat is guided into the energy storage device, and the cooling rate is controlled. According to the method, accurate mode switching of electromagnetic heating from uniform temperature rise to gradient heating is achieved through cooperation of magnetic field activation and a gradient triggering mechanism, and the temperature gradient establishment speed and the morphological stability are effectively improved in cooperation with power regulation and control partition differentiation power instruction and thermal insulation layer parameter dynamic matching.

The invention discloses an enclosure system of a low-temperature storage tank and transportation equipment, and relates to the technical field of fluid transportation, the enclosure system is installed on the inner wall of the low-temperature storage tank, the enclosure system comprises a plurality of heat insulation modules installed on the inner wall of the storage tank, the heat insulation modules are spliced and cover at least part of the inner wall of the storage tank, and the heat insulation modules are arranged on the inner wall of the storage tank; assembling grooves are formed in the splicing positions of the heat insulation modules; the bridging blocks are installed in the assembling grooves, and every two adjacent heat insulation modules can be connected together through the corresponding bridging blocks; the shielding module is connected with the heat insulation module, the shielding module comprises a first shielding layer, a second shielding layer and a third assembly plate, the first shielding layer and the second shielding layer are arranged in a spaced mode, and the third assembly plate is located between the first shielding layer and the second shielding layer. According to the invention, a better shielding effect can be realized by arranging two or more shielding layers, and the first shielding layer and the second shielding layer are arranged at intervals, so that the capacitive coupling effect between the shielding layers is reduced, and the penetrating power of electromagnetic waves is reduced.

The invention discloses a fiber foamed concrete and a preparation method thereof. The fiber foamed concrete comprises the following raw materials in parts by weight: 5290 parts of cement, 4965 parts of water, 1.361 part of foaming solution, 1.2964 part of fly ash and 10 parts of fiber. The preparation method comprises the following steps: proportionally weighing the components; sequentially adding the cement and fly ash into a stirrer, proportionally weighing the water, uniformly stirring the mixture by the stirrer, and adding the fiber; preparing and adding the foaming solution; gradually adding the foam into the mixture, and continuously stirring until all the components are uniformly mixed; pouring the mixture into a mold on which lubricating oil is brushed, and curing in a curing chamber; after 24 hours, removing the mold; and respectively curing for 3 days, 7 days and 28 days for experimental detection. The fiber foamed concrete has the advantages of favorable thermal insulation property, favorable compression resistance and favorable bending resistance, and is applicable to a railway bed strengthening layer.

The invention relates to a thermal insulation evaluation method for a light recycled building block based on thermal coupling simulation, which comprises the following steps: modeling the recycled building block into a heterogeneous multiphase complex, and introducing a three-layer structure field of micro pores, mesoscopic aggregates and macroscopic blocks; a partition coupling strategy is adopted, a microstructure variability-heat flux density disturbance-stress field reconstruction causal chain is constructed, and macroscopic thermal insulation performance fluctuation caused by thermal deformation is captured; tracking a thermal stress concentration area caused by temperature difference change through thermal and force coupling simulation; analyzing the influence of a thermal stress migration path on local structure integrity, pore change and crack evolution; constructing a thermal stress and structure disturbance factor framework, and evaluating the influence degree of the structure local deformation on the thermal resistance; extracting high-dimensional feature data; establishing a heat and force characteristic space; constructing a response surface equation, and mapping a change track of the thermal insulation performance in a heat and force coupling response space; a time and structure response composite scoring system is formed, real coupling of multiple physical fields is achieved, and limitation of traditional evaluation is broken through.

The invention relates to the technical field of low-temperature storage tank installation, in particular to a low-temperature storage tank heat insulation module installation construction method which comprises the steps that expansion bolts are implanted into preset point positions of the inner wall of a low-temperature storage tank, inner wall morphology data are obtained through three-dimensional laser scanning, and a point cloud model is generated. A BIM system is used for constructing a three-dimensional model of the installation datum plane, the theoretical leveling height of each expansion bolt point position is calculated, and a leveling parameter instruction set is generated. And a servo motor of the bolt tightening equipment is driven to rotate the ball nut, so that the leveling gasket moves to the target height. And a press-fitting path is generated, a press-fitting mechanical arm is controlled to align the preformed hole of the heat insulation module to the screw part of the expansion bolt and press-fit, and the surface of the heat insulation module is fully attached to the surface of the leveling gasket. And a fastening nut is installed on the screw part of the expansion bolt, three-dimensional deviation analysis is carried out, and iterative correction is carried out. Compared with the prior art, the effects of shortening the construction period, improving the leveling precision, reducing stress concentration, ensuring long-term stability and the like are achieved.

The invention provides a cross-seasonal heat storage coupling solar ground source heat pump combined heating system. The cross-seasonal heat storage coupling solar ground source heat pump combined heating system mainly comprises a solar heat collector, a valve, a heat storage water tank, a heating tail end, a buried phase change heat storage water tank, a buried pipe and a heat pump. Solar radiation heat in non-heating seasons is collected and stored through cross-seasonal heat storage, and the stored heat is extracted in the heating period in winter and is used for heating a building together with a solar ground source heat pump combined heating system. The system has the beneficial effects that the system efficiency is improved, and the use of thermal insulation materials is reduced, so that the cost is reduced; the buried pipe absorbs and inhibits heat diffusion of the heat storage water tank, heat balance of a soil temperature field around the buried phase change heat storage water tank is guaranteed, and efficient operation of a heat pump unit is maintained. The invention has six control methods: solar energy-soil heat storage, solar energy direct heating, solar energy coupling buried phase change heat storage water tank heating, buried phase change heat storage water tank direct heating, solar energy ground source heat pump combined heating and ground source heat pump independent heating.

The invention discloses a cement-based aerogel heat preservation and heat insulation coating material for concrete and a spraying construction process of the cement-based aerogel heat preservation and heat insulation coating material, and belongs to the technical field of concrete materials. The coating material is prepared from powder, composite emulsion and water, and the powder is prepared by mixing superfine sand, cement, modified silicon dioxide-carbon nanotube composite aerogel powder, hollow glass beads, nanofibers, graphene nanosheets, an ultraviolet light absorber, a water reducing agent and a defoaming agent. The composite emulsion is composed of an acrylate copolymer emulsion, a polyvinyl acetate-ethylene emulsion, a temperature-sensitive polymer emulsion and a coalescing agent. Based on the multi-stage pore network and multi-component emulsion optimization design and multi-component synergistic effect, the material has good fluidity after being mixed, and has low heat conductivity coefficient, high strength and high toughness after being hardened; the construction technology of high-pressure water flushing and layered spraying is provided, and the method has the advantages of being efficient in construction, stable in quality and the like and can be applied to heat preservation and heat insulation of a concrete structure in a severe environment.

The invention relates to the technical field of communication and network transmission, in particular to a terminal data acquisition and transmission method for a long-distance heat supply pipeline. The method comprises the following steps that long-distance heat supply pipeline laying area data are obtained, pipe network laying form analysis is carried out, and single-pipe branched heat supply pipe network data are obtained; constructing a pipeline laying model based on the data of the single-pipe branched heat supply network; performing intelligent heat energy flow simulation based on the pipeline laying model, and calculating heat loss in the heat energy flow simulation process to obtain heat loss data; performing thermal protection thermal insulation material integration on the pipeline laying model based on the heat loss data to obtain composite thermal insulation material data; and identifying a straight pipe section of the pipeline laying model, and calculating the minimum thick wall of the straight pipe section to obtain minimum thick wall data. The heat efficiency, the stability and the intelligent management capability of the pipeline system are improved based on the communication and network transmission technology.

The invention discloses an anti-fracture low-voltage power cable, and relates to the technical field of low-voltage cables, the anti-fracture low-voltage power cable comprises three core bodies, the surfaces of the three core bodies are all sleeved with shielding layers, the surfaces of the shielding layers are wrapped with insulating layers, the outer sides of the three core bodies are sleeved with an inner protection layer, the surface of the inner protection layer is sleeved with a thermal insulation layer, and the thermal insulation layer is wrapped with an outer protection layer. The outer side of the thermal insulation layer is sleeved with an outer protection layer, the surface of the outer protection layer is provided with a sliding protection mechanism, and the inner side of the outer protection layer is provided with a reinforcing anti-breaking mechanism in an embedded manner. And when the cable slides, the outer protection layer is not rubbed with the ground, so that the outer protection layer of the cable is prevented from being rubbed and scraped to influence subsequent normal use, the cable is protected to a certain degree, and impurities such as dust and soil adhered to the surface of the cable in the cable transportation and laying process can be scraped.

The invention discloses sound-insulation and heat-insulation building mortar and a preparation method thereof, and relates to the technical field of building materials, the sound-insulation and heat-insulation building mortar comprises, by weight, 42-48 parts of a cementing material, 15-25 parts of an auxiliary material, 17-22 parts of lightweight aggregate, 30-35 parts of a functional filler, and 1-2 parts of an additive; the cementing material is a mixture of sulphoaluminate cement and Portland cement; the auxiliary material is a mixture of fly ash and quartz sand, the lightweight aggregate is a mixture of 20-40-mesh hollow vitrified microbeads and 70-90-mesh hollow vitrified microbeads, and the mass ratio of the hollow vitrified microbeads to the hollow vitrified microbeads is 1: (2-3); the functional filler is a mixture of modified waste rubber particles and modified fibers; the additive is a mixture of a polycarboxylate superplasticizer and hydroxypropyl methyl cellulose ether. The mortar disclosed by the invention is good in thermal insulation performance and excellent in mechanical property, the method disclosed by the invention is simple to operate and low in cost, and the prepared mortar is excellent in performance.

The invention belongs to the technical field of hypersonic flight vehicle design, and discloses a design method for a thermal experiment model of a front body and an air inlet channel of a high-speed wind tunnel. The design verification method comprises the following steps: determining an overall structure and design requirements; determining a heating structure; determining a pressure measuring point and a temperature measuring point; determining an independent temperature control adjusting device; verifying the influence of the heat insulation groove on temperature gradient distribution; verifying the heat insulation effect of the heat insulation measures; model structure deformation generated by temperature is investigated; obtaining a heat flux density and surface temperature relation curve; the influence of model structure deformation on the flow field is studied. The design verification method proves that the precursor of the high-speed wind tunnel and the air inlet duct thermal experiment model have accurate temperature control and thermal insulation protection capabilities, and verifies the obvious influence of wall temperature change on the flow field structure; the aerodynamic thermal coupling effect can be effectively reproduced, a hypersonic air inlet heat-flow coupling experimental platform is established, and the experimental platform has engineering practical value.

The invention relates to the technical field of detection, in particular to a thermal insulation performance detection system and method of a thermal insulation gel material.The method comprises the steps that surface temperature data and internal pore distribution data of a thermal insulation gel material sample are obtained and subjected to dynamic heat flow coupling treatment, and a dynamic coupling feature sequence is obtained; constructing a multi-dimensional thermal impedance tensor based on the dynamic coupling feature sequence and carrying out regularization constraint to obtain a thermal impedance time sequence; extracting a nonlinear thermal shielding index in the thermal impedance time sequence, constructing a high-dimensional feature vector, and generating a probability density distribution parameter set; and according to the probability density distribution parameter set, constructing a multi-dimensional input data set and carrying out iterative optimization, calculating a confidence interval of the thermal insulation performance boundary value, evaluating the thermal insulation performance grade of the thermal insulation gel material based on the confidence interval, and generating a performance evaluation parameter report. The comprehensive heat insulation effect of the heat insulation gel material in actual use can be more comprehensively and accurately reflected.

The invention relates to the field of building materials, and discloses a multifunctional foamed ceramic sound insulation and heat preservation material for buildings. Comprising the following raw materials in parts by weight: 42 to 48 parts of pottery clay tailings, 14 to 16 parts of fly ash, 10.5 to 12 parts of crushed stone materials, 2.8 to 3.2 parts of a silicon carbide foaming agent, 0.7 to 0.8 part of a borax fluxing agent, 7 to 8 parts of paraffin / silicon dioxide phase change microcapsules, 0.5 to 1.0 part of graphene, 2.0 to 2.5 parts of nano iron powder, 0.05 to 0.5 part of nano silver, 1.0 to 1.5 parts of photocatalytic titanium dioxide and 0.3 to 0.4 part of a fluorosilane coupling agent. A stable matrix structure is constructed through the argil tailings, the fly ash and the crushed stone materials, the silicon carbide foaming agent and the borax fluxing agent reduce the heat conductivity coefficient, the sound insulation performance is improved, the material is endowed with the antibacterial ability through nano-silver and photocatalytic titanium dioxide, indoor sanitation is guaranteed, and a super-hydrophobic layer is constructed through the fluorosilane coupling agent.

The invention relates to a geopolymer-based non-expansive building fireproof coating, and belongs to the field of building materials. A geopolymer prepared from fly ash, granulated blast furnace slag, coal gangue, oil shale waste residues and sodium silicate water glass is used as a binder, and expanded perlite is used as a heat insulation filler to prepare the inorganic building fireproof coating. Meanwhile, tailings and basalt fibers are added, so that the contractibility and integrity of the geopolymer-based fireproof coating are improved. Compared with an organic fireproof coating, the environment-friendly fireproof coating has high environment friendliness in the production and preparation process and the use and action process in the case of a fire disaster. Compared with a traditional Portland cement-based fireproof coating, the fireproof coating has more excellent performance in the aspects of high temperature resistance, corrosion resistance and the like. According to the invention, the way of resource utilization of solid wastes is widened, and the building fireproof coating with excellent performance is provided.

The invention relates to the field of thermal insulation oil pipe detection equipment, in particular to a thermal insulation oil pipe thermal insulation performance detection device and a use method thereof.The thermal insulation oil pipe thermal insulation performance detection device comprises a detection pool with the hollow interior and the open top, and the open end of the detection pool is detachably provided with a pool cover frame with the hollow interior and the two vertical ends open; the heat insulation oil pipe is placed between the detection pool and the pool cover frame, the detection pool and the pool cover frame are jointly provided with clamping grooves used for containing the heat insulation oil pipe, sealing rubber strips are arranged between the detection pool and the pool cover frame, between the detection pool and the heat insulation oil pipe and between the pool cover frame and the heat insulation oil pipe, and end disc covers are detachably arranged at the two ends of the heat insulation oil pipe. The end disc cover is provided with a temperature sensor and an electric heating pipe, the temperature sensor and the electric heating pipe are both electrically connected to the control system, and the detection pool is provided with a liquid level adjusting piece, a liquid constant temperature piece, a gas circulation piece and a detection assembly. The method has the effect of improving the accuracy of the thermal insulation performance detection result of the thermal insulation oil pipe.

The invention discloses an automatic fire extinguishing device for automatically sensing thermal runaway of a battery of a new energy vehicle. The automatic fire extinguishing device comprises a base, a control box, a fire blanket body, a release assembly and a fire detection probe. The whole base is of a frame-shaped structure and is fixed to a preset position of a vehicle, and a fixed joint strip is arranged on the top face of the base. The fire blanket body is rectangular and comprises a base cloth layer, a coating and a heat insulation filling layer, a positioning strip is arranged on the top face, and heavy drooping blocks are arranged on the two sides. The release assembly comprises a fixed seat, a splicing seat, an electromagnet, a melt strip and a joint block, and the electromagnet adsorbs the heavy drooping block through magnetic force so as to store the fire blanket; the fire behavior detection probe comprises a spectrum sensor, a smoke sensor and an infrared temperature sensor and is used for monitoring fire behavior in real time. When a fire occurs, the control box receives a detection signal to cut off a power supply of the electromagnet, or the melt strip melts at a high temperature to actively cut off power, so that the weight drop block drops to pull the fire blanket body to be completely unfolded and cover a fire area, and the fire is inhibited by blocking oxygen.

The invention discloses a heat preservation and thermal insulation project whole industrial chain quality tracing method and system, and the method comprises the steps: obtaining industrial chain data and monitoring data of a heat preservation and thermal insulation project, carrying out the tracing coding based on the industrial chain data and the monitoring data, and constructing a heat preservation and thermal insulation project whole industrial chain quality tracing network, determining industrial chain data corresponding to the to-be-traced monitoring data through the traceability code, and performing correction and anomaly screening on the to-be-traced monitoring data to obtain to-be-traced abnormal monitoring data, and according to the to-be-traced abnormal monitoring data and the thermal insulation project whole industry chain quality traceability network, determining a thermal insulation project whole industry chain quality hidden danger source. The method not only can improve the efficiency and accuracy of quality traceability of the whole industrial chain of the thermal insulation project, but also has good interpretability, and can be directly applied to a quality traceability system of the whole industrial chain of the thermal insulation project.

The invention relates to the technical field of pipeline detection, in particular to an infrared thermal imaging full-dimensional monitoring method for corrosion of a pipeline under a thermal insulation layer, which comprises the following steps of: acquiring temperature distribution under the thermal insulation layer and screening measuring points with consistent directions, extracting a boundary continuous region to calculate thermal probability, identifying abnormal measuring points and extracting time sequence characteristics, and predicting and marking response delay measuring points based on a model. And generating a CUI risk region division result. According to the method, a temperature difference direction consistency identification mechanism is constructed through space sequence subdivision and heat flow direction trend judgment of pipeline surface temperature distribution data, a measurement point set with clear space heat conduction characteristics is obtained through continuous screening, and a gradient change rate local extreme value is further taken as an identification basis; the method comprises the following steps: constructing a thermal anomaly probability evaluation parameter by combining spatial density and change intensity to realize preliminary identification of an abnormal point, then introducing a time sequence temperature parameter to construct a multi-dimensional dynamic feature set, and completing multi-step temperature prediction through normalized combination calculation after model training.

The invention discloses a preparation process of a fireproof lightweight thermal-insulation cement-based mortar material, which comprises the following steps: (1) placing porous lightweight aggregate in a sodium silicate solution for standing, and drying the obtained aggregate to obtain pretreated thermal-insulation aggregate; (2) uniformly mixing silica fume, calcium silicate powder, calcium hydroxide powder and water to form slurry; mixing the pretreated thermal insulation aggregate with the slurry, separating, airing the aggregate, and curing to obtain the primary thermal insulation aggregate. And (3) spraying water on the primary thermal insulation aggregate for wetting, then spraying ethanol containing a silane coupling agent, and airing to obtain the modified thermal insulation aggregate. And (4) uniformly mixing Portland cement, the modified thermal insulation aggregate, basalt fiber and a water reducing agent as raw materials, adding water, and uniformly stirring to obtain the mortar material. According to the invention, the water absorption rate of the porous lightweight aggregate is reduced, so that the adverse effect of the high water absorption characteristic of the aggregate on the mechanical properties of the mortar material is effectively reduced.

The invention discloses reflection-heat insulation dual-functional aluminum oxide ceramic and a preparation method and application thereof.The method comprises the steps that after surface silanization treatment is conducted on nanoscale hollow oxide filler, surface-modified nanoscale hollow oxide filler is prepared; and then adding the surface-modified nanoscale hollow oxide filler into a high-molecular polymer and a mixed polar solvent to obtain the thermal insulation coating. The method comprises the following steps: coating the surface of aluminum oxide ceramic with a heat insulation coating to form a primary coating, and carrying out gradient heating curing to obtain aluminum oxide ceramic with a functionalized heat insulation coating; and coating the surface of the thermal insulation coating functionalized aluminum oxide ceramic with an infrared reflection coating, and carrying out annealing treatment in a nitrogen atmosphere to prepare the reflection-thermal insulation dual-functionalized aluminum oxide ceramic. By constructing a double-layer composite structure, enhancing interface thermal resistance through chemical bonding, directionally distributing the nanofiller and designing a low-radiation layer structure, heat conduction and radiation heat transfer of the aluminum oxide ceramic-based material are synergistically reduced, and the high-temperature heat insulation performance of the aluminum oxide ceramic-based material is improved.

The invention relates to the technical field of pipe bracket testing, in particular to a thermal insulation pipe bracket overall strength displacement overload testing device and method.The thermal insulation pipe bracket overall strength displacement overload testing device comprises a bearing base and further comprises a pipe bracket base arranged on the upper side of the bearing base, a connecting pipe bracket is installed at the upper end of the pipe bracket base, a clamping plate is clamped to the upper side of the bearing base, and a rotating shaft is arranged on the clamping plate in a penetrating mode; the bottom end of the rotating shaft is clamped and connected with a connecting gear, and an annular groove is formed in the edge of the upper side of the bearing base. According to the invention, the axial and radial strength of the pipe bracket can be tested in the displacement overload test process, the use limitation is low, the automation degree is high, the test efficiency of the heat insulation pipe bracket is obviously improved, the situation that the pipe bracket is broken to injure people due to broken objects in the displacement overload test process of the pipe bracket can be avoided, and the test efficiency is improved. The displacement overload test structure has a good safety protection function, is high in use safety, and also realizes a step-by-step disassembly function of the displacement overload test structure, so that barrier-free maintenance of the test structure is facilitated.

The invention discloses a thermal insulation performance detection method and system for a composite wallboard, and relates to the technical field of building material detection, and the method comprises the steps: dividing a composite wallboard sample into a plurality of grids, setting an inversion starting point for each grid according to initial data, starting an inversion algorithm to gradually adjust the heat conductivity coefficient of each grid, and generating a heat conductivity coefficient distribution diagram, calculating the average heat conductivity coefficient and the overall thermal resistance value of the sample; the test platform applies full-automatic thermal excitation and sound wave excitation to a sample, collects sound signals and thermal imaging data related to internal defects of the composite wallboard, calculates the optimal matching time point of the sound signals and the thermal imaging data, and extracts defect related characteristics in the sound signals and temperature anomaly characteristics in thermal imaging in a double-flow processing mode. Generating a comprehensive defect distribution diagram, and comparing the comprehensive defect distribution diagram with the heat conductivity coefficient distribution diagram and the average heat conductivity coefficient to obtain preliminary judgment; through acoustic-thermal multi-mode cooperative detection, the spatial distribution of tiny defects in a sample is accurately positioned, and the influence of the tiny defects on the heat-conducting property is judged.

The invention discloses a damping thermal insulation material performance evaluation method and system for a battery pack, and relates to the technical field of battery pack thermal management, and the method comprises the steps: extracting a calibration sample set, applying transient thermal excitation, and collecting an infrared thermal image sequence to extract thermal response features; performing industrial CT scanning to obtain defect quantitative indexes, and forming a calibration data set with the thermal response characteristics; establishing a quantitative correlation model based on the calibration data set, and determining a batch quality threshold according to model output distribution; executing the same excitation and collection on an online sample to be detected to extract the characteristics of the sample, inputting the model to obtain a defect quantitative prediction value, comparing the defect quantitative prediction value with a batch quality threshold, and outputting an evaluation result; when a preset period or a trigger condition is met, a new sample is supplemented and extracted, and newly added calibration data is obtained to update the model and the threshold value. According to the method, accurate material performance evaluation is provided by establishing a quantitative model of thermal response characteristics and defect quantitative indexes, and evaluation consistency and stability are enhanced through a dynamic updating mechanism.

A spa shell for a spa includes a water holding compartment operative as a cold tub. The water holding compartment includes a floor wall, an equipment sidewall, and a floor connecting wall connecting the floor wall with the equipment sidewall. A non-slip laminate of thermally insulative material disposed on an exterior surface of each of the equipment sidewall and the floor connecting wall. A top deck wall extends from the water holding compartment toward an end of the spa shell. A non-slip laminate of thermally insulative material is disposed on an exterior surface of the top deck wall. The non-slip laminates of thermal insulative material thermally isolates the exterior surface of each of the equipment sidewall, the floor connecting wall, and the top deck wall. In some embodiments the spa shell further includes a second water holding compartment that is operative as a hot tub.

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 crosslinked polyethylene reinforced high-strength insulating aerial cable, and belongs to the technical field of crosslinked polyethylene cable materials.The crosslinked polyethylene reinforced high-strength insulating aerial cable is prepared by the steps that hydroxyl is introduced to nano boron nitride powder, then amino is grafted through KH-550, nano alpha-Al2O3 powder is modified through gamma-glycidyl ether oxypropyl trimethoxy silane, and the cross-linked polyethylene reinforced high-strength insulating aerial cable is obtained; the preparation method comprises the following steps: preparing low-density polyethylene, compounding the low-density polyethylene with aminated nano boron nitride powder to form nano composite powder, improving the interface bonding force between the low-density polyethylene and the nano composite powder, carrying out melt blending on the low-density polyethylene and the nano composite powder to improve the dispersity of the nano composite powder in the low-density polyethylene, and carrying out nucleophilic acyl substitution reaction to obtain a fluorine-containing modified monomer. The nano boron nitride powder and the nano alpha-Al2O3 powder are subjected to a cross-linking reaction under the initiation action of an initiator and then coat the exterior of the thermal insulation layer, and the nano boron nitride powder and the nano alpha-Al2O3 powder are bridged through siloxane bonds to form a three-dimensional heat-conducting network, so that the heat resistance of the outer insulating layer is improved.

The invention relates to the technical field of heat preservation and energy conservation, and particularly discloses a system for testing the heat conductivity coefficient of a pipeline heat preservation material under an engineering meteorological environment condition, which comprises a straight pipe test piece with calibration ends fixedly mounted at two ends, and a heat preservation covering material wrapped on the outer wall of the straight pipe test piece to form a pipe fitting to be tested; the ventilation hood is positioned in the sealed space; air pipes at the output end of the air conditioning system are all located in the sealed space, and air outlets of the air conditioning system directly face the ventilation hood. By simulating multi-parameter coupling working conditions such as in-pipe medium temperature gradient, external temperature and humidity / wind speed circulation and mechanical vibration, the heat conductivity coefficient of the material is dynamically corrected, whether the heat conductivity performance of each layer of material meets the standard specification or not is verified, and the rationality of the composite structure is quantitatively evaluated based on a thermal resistance network model. Data support is provided for optimizing the heat preservation layer combination mode and thickness design, and the problem of design deviation caused by the fact that a traditional method cannot reflect actual engineering working conditions is solved.

The invention relates to the field of thermal insulation materials, and provides a wet-process ceramic nanofiber thermal insulation material and a preparation method thereof.The wet-process ceramic nanofiber thermal insulation material is prepared from, by weight, 50-70 parts of ceramic nanofiber, 15-25 parts of modified glass fiber, 5-15 parts of inorganic functional filler, 4-10 parts of dispersing agent and 2-6 parts of adhesive; and 200 to 300 parts of deionized water. The wet-process ceramic nanofiber thermal insulation material provided by the invention has the characteristics of high strength, high flexibility and high thermal insulation property, and has better commercial application value.

The invention relates to the technical field of building thermal insulation material preparation and discloses a building thermal insulation material preparation device and method.The building thermal insulation material preparation device comprises a portal frame, a mixing barrel is fixed to the inner side of the portal frame through bolts, a middle filter plate is fixed to the inner wall of the mixing barrel through bolts, and an air cylinder is fixed to the top of the portal frame; according to the preparation device and the preparation method of the building thermal insulation material, after mortar raw materials are fed into the mixing barrel through the hopper, the air cylinder and the motor are started, and then the mortar raw materials are fed into the mixing barrel through the hopper; according to the mortar raw material mixing device, by arranging the air cylinder and the motor, the air cylinder and the motor are in linkage with the mixing assembly to conduct lifting movement and rotation in the mixing barrel, mortar raw materials are mixed and stirred in the process, meanwhile, under cooperation of the middle filter plate, blocks in the raw materials are extruded and crushed through the mixing assembly, and then the mixing uniformity of the mortar raw materials is comprehensively improved.

The invention discloses a flexible PI heat-conducting insulating film pad and a preparation method thereof, and relates to the field of film pads. The preparation method comprises the following steps: preparing Fe3O4 magnetic heat-conducting core and SiO2 insulating shell composite nanoparticles by a sol-gel method, treating and grafting epoxy groups by a silane coupling agent, performing ring-opening addition with one end amino group of amino-terminated polydimethylsiloxane, and reacting the other end amino group with polyethylene glycol diglycidyl ether, so that two flexible long chains are grafted on SiO2. Due to the modified composite nanoparticles and the flexible long-chain structure, the flexibility of the film pad is remarkably improved; thermal vibration of silicon-oxygen bonds and ether bonds promotes heat transfer, a hydrogen bond network is formed with a PI substrate to improve dispersion stability, particles are orderly arranged under the action of a high-frequency magnetic field to construct a three-dimensional heat conduction network, and heat conduction efficiency is enhanced; the SiO2 isolates the inner core from conducting and improves the insulating property of the film pad by virtue of good insulativity and no free charge in the flexible long-chain polymer. The flexible PI heat-conducting insulating film pad prepared by the invention has the effects of flexibility, heat conduction and insulation.