345results about How to "Reduce heat transfer" patented technology

According to the energy storage coupling heat pump steam generation method and system, the mode that the heat pump device and the energy storage device cooperatively operate is adopted, and efficient and economical steam supply is achieved. The method comprises the steps that high-temperature water is prepared and stored in the off-peak electricity period through the heat pump device, and the high-temperature water is further heated through the energy storage device to generate superheated steam for a user to use. The energy storage device comprises a plurality of energy storage modules, and a heat exchange pipeline of the energy storage device can be switched between a parallel connection mode and a series connection mode through switching, so that deep heat release and flexible regulation and control are achieved. According to the method, the energy storage capacity and heat release power of the energy storage module are dynamically adjusted, enthalpy increment distribution of the heat pump and the energy storage device is optimized in combination with load prediction, and diversified steam requirements are met. And meanwhile, preheating or dynamic supplement is conducted on the energy storage module through the heat pump device, waste heat recovery is achieved, and the energy efficiency is improved. According to the method, the operation cost is remarkably reduced, the capacity of the system for adapting to load fluctuation is enhanced, and the method is suitable for industrial steam use scenes and has the advantages of being efficient, stable and flexible.

The invention discloses a low-temperature early-strength cement slurry system based on a cellulose-based composite phase change material, and belongs to the field of oil and gas field well cementation. The preparation method of the composite phase change material comprises the following steps: adding pretreated waste paper fibers, a cross-linking agent and a heat conduction material into an alkali / urea solution, and putting the mixture into an ultrasonic cleaning instrument to obtain a mixture A; transferring to a dialysis bag, and soaking in deionized water to obtain a mixture B; and performing in-situ mixing on the mixture C and organic phase change material molecules to obtain a mixture C, and performing vacuum freeze drying. The low-temperature early-strength cement slurry system is prepared from the following components in parts by weight: 100 parts of cement, 0.3-1 part of a composite phase change material, 5-25 parts of a density reducing material, 0.1-0.8 part of an early strength agent, 0.2-1 part of a dispersing agent, 0.2-2 parts of a fluid loss agent, 0.01-0.5 part of a defoaming agent and 44-58 parts of water. While cement hydration heat release is regulated and controlled, the early compressive strength of the cement can be improved, and the operation time efficiency and the construction safety are improved.

The invention relates to the technical field of building materials, and discloses fire-resistant decoration waste exterior wall external thermal insulation mortar and a preparation method thereof. The fire-resistant decoration waste exterior wall external thermal insulation mortar comprises the following raw material components in parts by weight: 60-410 parts of cement; 120 to 550 parts of decoration waste recycled aggregate; 36 to 75 parts of SiO2 aerogel; 8 to 17 parts of a silane coupling agent; 1.3 to 2.1 parts of dispersible latex powder; 0.5 to 1.0 part of methyl cellulose; 7-15 parts of a water reducing agent; 0.2 to 0.4 part of an air entraining agent; and 120 to 180 parts of water. According to the invention, the low-cost and high-strength decoration waste recycled aggregate is used for partially replacing expensive and low-strength aerogel, so that the thermal insulation performance of the mortar is ensured, and the material cost is greatly reduced; the decoration garbage exterior wall external thermal insulation mortar can resist high-intensity fire disasters with the highest temperature of 1000 DEG C and the fire receiving time of 2.5 h, and can be applied to exterior wall external thermal insulation systems of high-rise and super high-rise buildings with high fire extinguishing difficulty.

The invention provides a full-size low-temperature medium outflow test system and an outflow test method. The system comprises a control system, an end socket, a storage tank, a conveying main pipeline, a pressure accumulator, a discharge pipeline, a filling pipeline, an air sealing pipeline, a pressurizing pipeline, a pressurizing tank, a liquid nitrogen filling tank car, a flow meter, a filling port, a regulating valve, a stop valve and an air sealing port. According to the system, a full-size test platform is built, low-temperature liquid nitrogen is used for replacing a low-temperature propellant, the working states of the pressurized conveying system under different flows and pressures are simulated, and the requirement that the system obtains the flowing performance closer to the real working condition through test examination under a low-temperature medium is met.

The invention discloses a thermal insulation exterior wall coating and a preparation process thereof. The thermal insulation exterior wall coating comprises the following components: composite aerogel powder, a composite flame retardant, a thickening agent, a dispersing agent, a wetting agent, a coupling agent, a cosolvent, a pH regulator, a defoaming agent, titanium dioxide, vermiculite, heavy calcium carbonate, a coalescing agent, a water-based pure acrylic emulsion, a flatting agent, hollow glass beads and deionized water. The prepared thermal insulation exterior wall coating is low in heat conductivity coefficient, good in thermal insulation performance and good in flame retardant capacity, the heat transfer capacity of the silicon dioxide aerogel is reduced through the synergistic effect generated through compounding of the silicon dioxide aerogel and the composite filler powder, and therefore the thermal insulation performance of the silicon dioxide aerogel is improved; and titanium dioxide in the composite filler powder can shield infrared light, so that the heat insulation capability of the heat-insulation exterior wall coating is improved, and the heat insulation performance of the heat-insulation exterior wall coating is further improved.

The utility model discloses a novel surface-mounted temperature sensor. Comprising a thermistor and further comprises a plastic package body, a frame base island and four frame pins located on the two sides of the frame base island are arranged in the plastic package body, and the frame pins on the two sides extend out of the edges of the two sides of the plastic package body respectively; the thermistor is located in the plastic package body and comprises thermal sensitive ceramic, metal electrodes are arranged at the top and the bottom of the thermal sensitive ceramic respectively, the metal electrode at the top of the thermistor is connected with the frame pins on the two sides through two wires respectively, and the metal electrode at the bottom of the thermistor is connected with the base island plane at the top of the frame base island. And the base island plane is respectively connected with the other frame pins on the two sides through two wires. The temperature sensor has the advantages of strong vibration resistance, long-term reliability and sensitive temperature sensing.

The invention discloses a liquid cooling energy storage system and a control method thereof.The liquid cooling energy storage system comprises a cabinet body, the cabinet body is provided with a PACK battery bin, the PACK battery bin is used for containing a battery pack assembly, the peripheral wall of the PACK battery bin is provided with a multi-layer heat insulation structure, and the multi-layer heat insulation structure comprises an outer layer plate and an inner layer plate; the first heat preservation filling layer is arranged between the outer layer plate and the inner layer plate; and the bottom of the PACK battery compartment is provided with a drainage assembly for draining condensed water. Through the outer layer plate, the inner layer plate and the middle heat preservation filling layer, the influence of the external environment on the internal environment of the cabinet body is reduced, and the temperature distribution of the internal space of the cabinet body except the surface area of the liquid cooling plate is relatively uniform and stable. The multi-layer heat insulation structure can reduce heat conduction inside and outside the cabinet body and reduce heat convection. Therefore, the gathering speed of water vapor on the surface of the liquid cooling plate can be reduced. The multi-layer heat insulation structure can help maintain a relatively stable humidity environment in the cabinet body, which is helpful to reduce the generation of condensation.

The invention discloses a coaxial fibroin / cellulose aerogel fiber and a preparation method thereof. The preparation method comprises the following steps: adding cellulose into a first ion solution to obtain a cellulose solution; adding silk fibroin into the second ion solution to obtain a silk fibroin solution; adding the cellulose solution serving as a core layer spinning solution and the silk fibroin solution serving as a skin layer spinning solution into coaxial wet spinning equipment to extrude and form a coaxial fiber precursor, and performing solidification regeneration, freezing and drying to obtain the coaxial fibroin / cellulose aerogel fiber. According to the preparation method, silk fibroin and cellulose are dissolved in a 1-butyl-3-methylimidazole acetate ionic solution to obtain a spinning solution, the silk fibroin solution serves as a skin layer, the silk fibroin / cellulose aerogel fiber is prepared through coaxial wet spinning in a constant-temperature water bath, the preparation method is simple, large-batch production can be achieved, and the preparation method is suitable for industrial production. No harmful substances are added in the preparation process, no degradation-resistant substances are generated in the product, the product is biodegradable, the recycling rate is high, and the good effect is achieved in the aspect of environmental protection.

The invention discloses an air energy heat pump all-in-one machine and a using method thereof, and relates to the technical field of heat pumps. Comprising a machine body, an evaporator, an adjusting module and an airflow driving module, the adjusting module is installed on the outer side of the evaporator, and the airflow driving module is installed on the adjusting module; the method further comprises the following steps that S1, in the daily operation mode, air flow is enhanced; s2, switching to a dust removal mode in a specific period of time every day, and removing dust on the surface of the evaporator; s3, dust removal is conducted on the ventilation plate; s4, switching to a defrosting mode; and S5, the angle is automatically adjusted, and the evaporator is defrosted from bottom to top. In a daily operation mode, the air conditioner is cooperatively matched with the fan to enhance air flow and improve heat exchange efficiency, in a dust removal mode, the air duct can remove dust on the evaporator and the ventilation plate at regular time, in a defrosting mode, the air duct moves from bottom to top to defrost, the upper half part of the air duct preheats and melts a frost layer, and the defrosting effect is improved. And the lower half part evaporates and dries the defrosted water drops.

The utility model discloses a non-woven fabric bag laser engraving device which comprises an engraving box, a conveying belt is arranged in the engraving box, a motor is fixedly connected to the top of the engraving box, a screw rod is fixedly connected to the front end of the output end of the motor, an installation rod is connected to the outer side of the screw rod through threads, and the installation rod is fixedly connected to the top of the engraving box. The mounting rod is slidably connected with the engraving box, a mounting seat is fixedly mounted at the bottom of the mounting rod, an engraving head is arranged at the bottom of the mounting seat, a positioning mechanism is arranged on the engraving box, and a cooling mechanism is arranged on the engraving box. The motor is designed to drive the carving head to move, a non-woven fabric bag can be carved and formed through the carving head, through the action of the hydraulic cylinder, the output end of the hydraulic cylinder can drive the support to move downwards, then the pressing block can be driven to move downwards, and the non-woven fabric bag can be pressed and positioned through contact of the pressing block with the non-woven fabric bag. The carving process stability is improved, and the carving effect is improved.

The invention provides a fully synthetic cutting fluid special for a copper part and a preparation process thereof. The fully synthetic cutting fluid special for the copper part comprises the following raw materials in parts by weight: 0.5-2.0 parts of a defoaming agent, 1.0-3.0 parts of an antioxidant, 0.5-2.0 parts of a corrosion inhibitor, 2.0-5.0 parts of a surfactant, 0.5-1.5 parts of a metal ion complexing agent and 80.0-100.0 parts of deionized water. Wherein the antioxidant is prepared from carnosol, daidzin and butylated hydroxytoluene. The carnosol and the daidzin can be used for reducing the oxidation reaction by capturing free radicals, and the butylated hydroxytoluene can be used for further enhancing the anti-oxidation effect by interrupting the oxidation chain reaction. And through the combined action and mutual complementation of different anti-oxidation mechanisms, a synergistic effect is formed, and oxidation of the copper part in the machining process is effectively prevented. Wherein the metal ion complexing agent is composed of isothiocyanate, polyaspartic acid and amino trimethylene phosphonic acid, multiple protection mechanisms are formed, and the corrosion resistance of the copper part is remarkably improved. And the existence of the metal ion complexing agent is also beneficial to improving the stability of the cutting fluid.

The utility model discloses a corner anti-abrasion device for a CFB boiler hearth, relates to the technical field of boiler equipment, and solves the problems that the lower position of a water wall tube at the corner of the existing hearth is seriously abraded, and the existing anti-abrasion method is easy to cause hydrodynamic deterioration to cause tube explosion. The ash blocking device comprises a plurality of ash blocking structures, wherein the ash blocking structures are arranged at four corners in a CFB boiler hearth and are connected with a water cooling wall; the dust blocking structure is of a 90-degree V-shaped structure; a corrugated structure is arranged on the side, connected with the water cooling wall, of the ash blocking structure. The ash blocking structure is arranged on the water cooling wall of the CFB boiler hearth in a downward inclined mode. The plurality of rectifying plates are arranged between two adjacent dust blocking structures in the vertical direction and are connected with the end parts of the dust blocking structures; the rectifying plates are further connected with the water cooling wall. According to the utility model, the type of the ash curtain is adjusted through the ash blocking structure, and the distance between the ash curtain and the pipe as well as the fin is adjusted; and ash particles at the end of the ash blocking structure are prevented from being transversely ejected through the rectifying plate, and adjacent pipes on the outer side are prevented from being abraded.

According to the technical scheme, the bamboo-plastic-steel composite external wall panel is characterized by comprising a first plastic-steel panel, a second plastic-steel panel is arranged on one side of the first plastic-steel panel, and a transverse partition plate is fixedly connected between the first plastic-steel panel and the second plastic-steel panel; the dynamic heat insulation assembly is arranged on one side of the second plastic steel panel and used for adjusting the temperature in the building; by arranging the heat insulation assembly, when the temperature is high in summer, an organic acid solution in a storage pipe is subjected to phase change, absorbs external heat and changes the liquid state into a solid state, the heat insulation effect is achieved, when the temperature is reduced in winter, the solid organic acid solution is changed into the liquid state, heat is released, and therefore the temperature in a building is increased; and meanwhile, when the external temperature is insufficient and the phase change occurs, the electric heating plate can be started to provide heat and enable the phase change of the organic acid solution, so that the temperature in the building can be dynamically adjusted according to the requirements of residents.

The invention discloses a high-temperature heat distribution pipeline heat preservation structure, and relates to the technical field of high-temperature heat insulation. The heat preservation structure comprises a plurality of heat insulation supporting strips made of heat insulation materials, the heat insulation supporting strips are evenly distributed around the periphery of a preset circle, and the heat insulation supporting strips extend in the axial direction of the preset circle. The circumference defined by the outer sides of the heat insulation supporting strips is covered with a first reflecting layer, and the first reflecting layer is sequentially covered with a second heat preservation layer, a second reflecting layer, a third heat preservation layer and a waterproof layer. The two ends of each heat insulation supporting strip are each provided with a closed ring, each closed ring can seal a cavity defined by the corresponding two adjacent heat insulation supporting strips, the corresponding first reflecting layer and the preset circle periphery, the heat preservation effect is high, the structural thickness is small, the heat preservation efficiency is high, the heat preservation efficiency cannot be reduced after long-term use, and the heat preservation effect is good. And the requirements of heat efficiency and reliability of a medium conveying pipeline are met. The thermal pipe is covered with the thermal insulation structure.

The invention relates to the technical field of temperature control, in particular to a low-temperature temperature control device, and aims to solve the problem that an existing cooling device is poor in temperature control effect. Therefore, the low-temperature temperature control device comprises a liquid nitrogen tank, a gas conveying pipeline, a heating assembly and a heat preservation assembly. A sealing cover is arranged at a tank opening of the liquid nitrogen tank; the gas conveying pipeline comprises an outer pipe and an inner pipe located in the outer pipe, the first end of the outer pipe is fixedly connected with the sealing cover, the first end of the inner pipe penetrates through the sealing cover and extends into the liquid nitrogen tank, and a first vacuum space is formed between the outer pipe and the inner pipe; the heating assembly can heat and gasify liquid nitrogen into nitrogen; the heat preservation assembly comprises an outer shell, an inner shell and a cold conduction shell which are sequentially nested from outside to inside, a second vacuum space is formed between the outer shell and the inner shell, a flow channel is formed between the inner shell and the cold conduction shell, the two ends of the flow channel communicate with the inner pipe and the atmosphere correspondingly, and the cold conduction shell is provided with a storage cavity. Therefore, heat loss in the nitrogen transmission process can be reduced, and the low-temperature temperature control effect on the storage cavity is improved.

The invention provides a diaphragm with an active coating for a battery and a preparation method of the diaphragm. The diaphragm is composed of a diaphragm substrate and a composite coating coated on the substrate, the composite coating comprises an outer coating and an inner coating, wherein the outer coating contains N-methyl-N-propyl pyrrolidine bis (trifluoromethanesulfonyl) imide, and the inner coating contains any one or more of polyacrylic acid, a metal organic framework compound, modified boehmite, polyvinylidene fluoride and polymethyl methacrylate. The N-methyl-N-propyl pyrrolidine bis (trifluoromethanesulfonyl) imide salt is coated on the diaphragm, so that the thermal stability and the ionic conductivity of the diaphragm can be enhanced, the internal resistance of the battery is reduced, the charge-discharge efficiency of the battery is improved, the cycle life of the battery is prolonged, and meanwhile, the potential harm to the environment is relatively small. The N-methyl-N-propyl pyrrolidine bis (trifluoromethanesulfonyl) imide salt has good compatibility with the electrolyte of the lithium ion battery and is not easy to generate chemical reaction, so that the performance stability and the safety of the battery are ensured.

The invention relates to the technical field of research reactor material irradiation, and provides a variable thermal resistance structure suitable for material irradiation temperature adjustment and a design method, the variable thermal resistance structure comprises a protection tube and a to-be-tested sample arranged in the protection tube, an elastic thermal resistor is arranged between the protection tube and the to-be-tested sample, and the elastic thermal resistor is in contact with the protection tube and the to-be-tested sample at the same time; the cross section of the elastic thermal resistor is of an annular structure formed by continuous bending, inert gas is further filled between the protection tube and the sample to be tested, the elastic thermal resistor is in contact with the outer wall of the sample to be tested and the inner wall of the protection tube at the same time, heat transfer of an original air gap layer is changed, and heat transfer performance is enhanced; meanwhile, the elastic thermal resistor formed by bending has certain ductility, so that the outward heat transfer capacity of the sample to be tested in the irradiation test is enhanced, the influence of thermal expansion on heat transfer is reduced, and the irradiation test requirements of various materials are met; parameter determination is carried out through an out-of-pile verification test, and in-pile condition tests are combined, so that the elastic thermal resistance meeting the requirements is rapidly screened out.

The invention relates to an integrated high-temperature-resistant lead-bismuth-resistant pressure sensor and a working method thereof, and belongs to the field of sensors, the integrated high-temperature-resistant lead-bismuth-resistant pressure sensor comprises a sensor main body and a cable output device, and the sensor main body and the cable output device are connected through a metal cable; the upper end of the cable shell is connected with the metal cable, the lower end of the cable shell is sequentially welded with the shell, the diaphragm and the threaded column with the hole to form an integrated shell structure, the graphene column is arranged in the integrated shell structure, and the upper end of the graphene column is connected with a core wire of the metal cable; the insulating tube is located in the integrated shell structure and wraps the graphene column, the lower end of the graphene column is connected with the piezoelectric ceramic and the metal gasket, the piezoelectric ceramic is completely located in the insulating tube, the metal gasket is partially located in the insulating tube, and the bottom of the metal gasket is embedded above the diaphragm; insulating rings are arranged at the contact position of the graphene column and the cable shell and the contact position of the graphene column and the shell. According to the invention, short circuit or open circuit is not easy to occur, sealing performance and performance are good, and normal operation can be continuously carried out in a high-temperature lead-bismuth environment.

The invention belongs to the technical field of fire extinguishing agent materials, and provides an aluminum silicate gel fire extinguishing agent for lithium battery fire disasters and a preparation method of the aluminum silicate gel fire extinguishing agent. The fire extinguishing agent is composed of a modified aluminum silicate gelling agent, a modified emulsion, a cross-linking agent, an adsorbent, a flame retardant, a foam stabilizer and a foaming agent, a phosphate group is introduced into the aluminum silicate gelling agent, so that the aluminum silicate gelling agent has better free radical capturing capacity, hydroxyl free radicals and hydrogen free radicals in flames are eliminated, and the flame extinguishing effect is improved. According to the present invention, the modified emulsion is added, such that the good fire extinguishing effect can be provided, the re-combustion phenomenon of the lithium ion battery can be effectively prevented, the long-chain alkyl group and the epoxy group are introduced into the modified emulsion so as to improve the lipophilicity and the hydrophilicity of the emulsion, effectively reduce the surface tension, and improve the wetting effect on the surface of the lithium battery; the fire extinguishing effect is further enhanced, and meanwhile, the activated carbon adsorbent can well adsorb generated harmful gas when the lithium ion battery is on fire.

The air suction silencer comprises a cavity and a communicating pipe installed in an inner cavity of the cavity, the cavity is provided with an air outlet and an air inlet, the outlet end of the communicating pipe is arranged at the air outlet, and the pipe wall of the outlet end is provided with an open first heat insulation groove in the extending direction; the inlet end of the communicating pipe is arranged at the air inlet, and an open second heat insulation groove is formed in the pipe wall of the inlet end of the communicating pipe in the extending direction. According to the air suction silencer provided by the utility model, the heat conduction effect of heat in the silencer on a refrigerant entering the communicating pipe can be reduced, the air suction efficiency is improved, and the energy consumption is reduced.

The invention relates to the technical field of waterproof coiled materials, and discloses an infrared heat reflection type thermoplastic polyolefin waterproof coiled material and a preparation method thereof.The infrared heat reflection type thermoplastic polyolefin waterproof coiled material is prepared from hexachlorocyclotriphosphazene, aminopropyltriethoxysilane, formaldehyde and the like through a series of reactions to obtain hexachlorocyclotriphosphazene silane; the preparation method comprises the following steps: carrying out condensation on hexachlorocyclotriphosphazene, nano far-infrared ceramic powder and rutile titanium dioxide to obtain modified nano far-infrared ceramic powder and modified rutile titanium dioxide, and carrying out reaction on an intermediate product 1 and beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl chloride to obtain the hexachlorocyclotriphosphazene hindered phenol. Finally, polyolefin elastomer, functional titanium dioxide IR-1000, modified nano far-infrared ceramic powder and the like are evenly mixed, melted, plasticized, cooled and shaped, and the infrared heat reflection type thermoplastic polyolefin waterproof coiled material is obtained, and tests prove that the waterproof coiled material prepared through the method has excellent flame retardance, heat aging resistance and mechanical property.

The invention relates to the technical field of gas storage, in particular to a storage device. The storage device comprises a storage tank used for storing low-temperature liquefied gas; the shell part comprises a shell body and a connecting piece, a containing space is formed in the shell body, the saving box is located in the containing space, one end of the connecting piece is connected to the shell body, and the other end of the connecting piece is connected to the saving box; and the cooling part comprises a cooling pipeline, the cooling pipeline is wound around the exterior of the storage tank and the connecting piece, and a cooling medium is contained in the cooling pipeline. Based on the setting, the storage device provided by the embodiment of the invention can reduce the temperature influence of the external environment on the storage tank, prolongs the storage time of the storage tank for the low-temperature liquid gas, and is beneficial to reducing the loss of the low-temperature liquid gas.

The utility model relates to the technical field of harvesters, and discloses a heat insulation device for a harvester ceiling, which comprises a machine room, the upper surface of the machine room is fixedly connected with a grid plate, the four corners of the upper surface of the grid plate are fixedly connected with supporting columns, the top ends of the four supporting columns are fixedly connected with heat insulation cotton, and the heat insulation cotton is fixedly connected with the machine room. The upper surface of the heat insulation cotton is fixedly connected with a ceiling, the upper surface of the ceiling is fixedly connected with a reflecting layer, through grooves are formed in the upper surface of the grid plate and the lower surface of the heat insulation cotton, and a plurality of micropores are formed in the grid plate. According to the ceiling, indoor and outdoor temperature can be effectively isolated through the heat insulation cotton, heat directly irradiated by sunlight can be effectively reflected through the reflecting layer, the heat insulation effect is further improved, the heat conduction effect of solar radiation is effectively reduced through the arrangement of the through grooves, heat preservation is conducted on the interior of the machine room, and the heat insulation effect of the ceiling is effectively improved; the health of the driver and the improvement of the working efficiency are facilitated.

The invention relates to the technical field of total temperature testing, in particular to a high-precision total temperature probe based on a double-filament thermocouple, which comprises a stagnation cover, a probe support rod, an air inlet section, a contraction section, a square through hole, a thermocouple wire, a thermocouple wire lead pipeline, an air outlet section and a probe rear cover. The stagnation cover is formed by combining a cylinder and a fast convergence curve rotating body, the head of the stagnation cover is chamfered by 45 degrees, two thermocouple wire lead pipelines are arranged on the inner side of a square hole, and two thermocouple wires are arranged in parallel, tensioned in a linear shape and penetrate through the thermocouple wire lead pipelines. A probe rear cover is arranged on the side, back to the main flow, of the probe supporting rod. The side, back to the main flow, of the probe supporting rod extends out of the lead pipeline and is welded to the insulated wire. The invention provides a novel heat conduction error correction method which does not depend on the measurement of the temperature of the root of the thermocouple. Through experiments and theoretical analysis and in combination with computational fluid dynamics (CFD) simulation, key information can be directly extracted from measurement data of the thermocouple, so that heat conduction errors are accurately corrected, the measurement accuracy of the total temperature is remarkably optimized, and the total error is reduced to be smaller than 0.1%.

According to the preparation method of the high-temperature-ablation-resistant heat-insulation aerogel, a plasticizer polyethylene glycol is introduced into a graphene and silicon dioxide dispersion liquid for composite film laying, then a solvent plasticizing foaming technology is utilized for preparing the composite aerogel, and the prepared aerogel has the ablation-resistant function and the excellent heat insulation function; and meanwhile, the material has the advantages of light weight, good compression resilience and the like, and can be repeatedly used by maintaining the original shape and performance at high temperature. The scheme has the advantages of simple process, controllable process, low reaction conditions, suitability for industrial production and the like.

The invention provides an air conditioning system, and belongs to the technical field of electrical equipment. The air conditioning system comprises a first heating device, a first control valve, a second control valve and a controller. And the controller is used for controlling the port A to communicate with the port B, controlling the port C to communicate with the port D and controlling the port E to communicate with the port F when the air conditioning system is in a heating mode and the outdoor temperature is within a preset temperature range, so that a refrigerant firstly absorbs part of heat in the outdoor heat exchanger and then flows into the first heating device to absorb heat. By the adoption of the air conditioning system, the first heating device shares a part of heat exchange burden for the outdoor heat exchanger, the heat exchange degree of the outdoor heat exchanger is reduced, the frosting time of the outdoor heat exchanger is delayed, then the reverse defrosting frequency is reduced, and the heating efficiency of the air conditioning system in the heating mode is improved.

The utility model discloses a mould structure for preventing generation of cold shut, which comprises an upper mould core, a lower mould core, an insert and a water cooling needle, the upper mould core and the lower mould core are combined to form a product cavity after being covered, the upper mould core is provided with an assembly area, the insert is arranged in the assembly area and comprises a block body, and the lower end of the block body extends to be provided with a characteristic part. The feature part is used for forming a product deep cavity structure; the side surface of the block body is concavely provided with a vertically-through exhaust groove, the exhaust groove and the inner wall of the assembly area form an exhaust channel, the upper end of the exhaust channel is connected with an exhaust pipeline, the upper surface of the block body is concavely provided with a cooling pipeline, the cooling pipeline extends to the feature part, and the water-cooling needle is inserted into the cooling pipeline. The insert is installed on the upper mold core to form a product deep cavity structure, the exhaust groove is formed in the insert, an exhaust channel is formed by the exhaust groove and the inner wall of the assembly area, molten aluminum is promoted to rapidly enter a vertical face, meanwhile, gas in the cavity is promoted to be exhausted, and gas entrapment is avoided.

According to the preparation method of the polypyrrole / hot-pressed melamine sponge aerogel provided by the invention, the polypyrrole is loaded on the hot-pressed melamine sponge in situ by utilizing a pyrrole polymerization reaction, the obtained aerogel can fully utilize the excellent optical performance of the polypyrrole and the porous structure of the hot-pressed melamine sponge, and the polypyrrole / hot-pressed melamine sponge aerogel is prepared. The preparation of the polypyrrole / hot-pressed melamine sponge aerogel which is high in mechanical property, super-hydrophilic, low in thermal conductivity and high in photo-thermal conversion efficiency is realized. The polypyrrole / hot-pressed melamine sponge aerogel prepared by the method provided by the invention can be applied to solar evaporation in saline water, actual seawater or heavy metal wastewater so as to obtain a clean water source.

This invention belongs to the field of iron and steel smelting technology, and particularly relates to a protective device and manufacturing method for a converter movable fume hood lifting lug. It includes lifting lugs and a movable fume hood. The lifting lugs are welded to the movable fume hood. A protective cover with an internal interlayer, matching the outer contour of the lifting lug, is hung on the outside of the lifting lug. The two sides of the interlayer of the protective cover are connected by ribs. Several V-shaped anchoring nails are welded to the interlayer wall of the protective cover. Refractory grout is filled into the interlayer of the protective cover. Asbestos is laid between the protective cover and the lifting lug. One end of the protective cover is welded to the movable fume hood. Several round rod hanging lugs are welded to both sides of the protective cover, and the upper ends of the round rod hanging lugs are hung on the lifting lugs. This invention isolates the lifting lug from the heat source through the protective cover, preventing the lifting lug from being burned. While the protective cover is fixed to the lifting lug and the movable fume hood, it reduces the contact area, thereby reducing heat transfer.

The utility model relates to a semitransparent roof capable of prolonging lighting of a building, and belongs to the technical field of civil engineering. The device comprises a round top body, an arc-shaped plate and a glass plate, the round top body is in the shape of a bent rectangle, a plurality of groups of parallelepiped protruding pipes are arranged on the upper surface of the round top body, the parallelepiped protruding pipes form a cavity, the parallelepiped protruding pipes comprise the left parallelepiped protruding pipes, the center parallelepiped protruding pipes and the right parallelepiped protruding pipes, and the center parallelepiped protruding pipes and the right parallelepiped protruding pipes are arranged in the cavity. And the plurality of groups of parallelepiped convex pipes are transversely arranged on the circular top body. The utility model can enlarge the daylight of the interior area of the building by using the double lenses, and can reduce excessive heat entering the illuminated environment even under low climate conditions. About 30% of heat entering the interior and the exterior of a room through a roof is reduced, linear and non-point installation modes are adopted, and natural light is more evenly distributed in the environment. Prism polycarbonate, acrylic acid or other compatible materials can be used as manufacturing materials, and vacuum system forming is adopted in the manufacturing process.