42results about How to "Reduce temperature drop rate" patented technology

The invention discloses a composite phase-change energy storage material for microcapsules and a preparation method thereof. The coating of the microcapsule is made of silicon dioxide, and the core of the microcapsule is made of a phase-change energy storage material, wherein the phase-change energy storage material is a paraffin organic solid-liquid phase-change energy storage material. 0.2 to 0.5 wt.% of dispersed emulsifier, 52.5 to 62.5 wt.% of solvent water, 18.75 to 31.5 wt.% of phase-change energy storage material and 15.5 to 18.75 wt.% of inorganic silica source are matched and put into a reactor for stirring for 5 to 8 hours; the mixture is uniformly dispersed and emulsified at the temperature 3 to 8 DEG C higher than that for solid-liquid phase change; hydrochloric acid aqueous solution catalyst with the pH value of 0.93 to 4.07 or sodium hydroxide aqueous solution catalyst with the pH value of 8.0 to 12.0 is added into the emulsion; the reacting solution is naturally cooled to room temperature and precipitation solution is obtained; the precipitate is washed with the combination of water and petroleum ether, wherein the mass percent of the petroleum ether is 30 wt.%; then the precipitate is washed with deionized water and is filtered, and the product is naturally aired. The invention improves the technology of phase-change energy storage and conservation, and has the function of automatic temperature regulation, favorable physical and chemical stability, crack resistance, flame retardancy, wear resistance and high thermal conductivity.

The invention relates to a rolling compaction process based on asphalt mixed material compaction characteristic. The rolling compaction process comprises the following steps: 1) determining the inserting pressing temperature of the asphalt mixed material; 2) determining the final pressing temperature of the asphalt mixed material by a compaction characteristic experimental method; 3) determining the effective rolling compaction time; 4) determining the rolling compaction mode; and 5) determining rolling compaction parameters. The invention provides the rolling compaction process capable of guaranteeing complete compaction of the asphalt mixed material by considering the compaction characteristic of the asphalt mixed material and the temperature field change rule and by reasonably determining the final pressing temperature of the asphalt mixed material and the effective compaction time so as to guarantee that the compaction degree meets the requirements.

The embodiment of the invention provides a refrigerator capable of preventing the upper surface of a middle beam from being frozen, and relates to the technical field of refrigeration equipment. The refrigerator is provided for solving the problem that a lead of a heating device of a middle beam of an existing refrigerator is likely to be affected with cold and damp so as to be aged. The refrigerator capable of preventing the upper surface of the middle beam from being frozen comprises a box body and door bodies used for sealing the box body. The middle beam is arranged at the position of an opening of the box body. The middle beam is of a hollow structure, a heating device is arranged inside the middle beam, and the middle beam is filled with heat insulation materials. The end of the middle beam is in sealed connection with the inner wall of the box body. A lead of the heating device is electrically connected with a control circuit of the refrigerator after penetrating out of the end of the middle beam and the inner wall of the box body. The refrigerator capable of preventing the upper surface of the middle beam from being frozen is used for storing goods at a low temperature.

The invention relates to a high-strength corrosion-resistant nickel-based polycrystalline high-temperature alloy and a preparation method thereof. The alloy comprises the following components of, in percentage by mass, 13%-17% of Cr, 15%-20% of Co, 0.1%-0.5% of Ti, 5.0%-5.5% of Al, 3.0%-7.0% of W, less than or equal to 0.5% of Si, less than or equal to 0.5% of Mn, 1.5%-2.0% of Nb, 0.04%-0.07% of Cand the balance Ni. Homogenizing treatment is conducted after smelting is conducted, hot rolling is conducted and finally heat treatment is conducted. The alloy has excellent strength and corrosion resistance, and the tensile yield strength of the alloy at a room temperature and 850 DEG C is higher than 900 MPa and 680 MPa respectively, and the alloy has excellent processing performance and structure stability at the same time.

The invention discloses a ladle furnace (LF) refining steel ladle sealing device and a use method thereof. The LF refining steel ladle sealing device comprises a ladle body and a ladle cover. The bottom edge of the ladle cover and the top edge of the ladle body are sealed and buckled. The ladle cover is provided with one or more wire feeding pipes. When the ladle cover and the ladle body are buckled, the bottoms of the wire feeding pipes are located above molten steel inside the ladle body. When the LF refining steel ladle sealing device is used, the ladle cover is sealed on the ladle body through hoisting equipment, alloy core wires penetrate through the wire feeding pipes, and the wire feeding depth is controlled to be 100-200 mm below the interface of the molten steel. The ladle body is sealed through the ladle cover, so that contact burning of strong deoxidizer and oxygen in air on the steel slag interface is avoided, and loss of the strong deoxidizer is reduced. Contact burning of the alloy core wires and the oxygen is reduced, and the situation that calcium compounds in the molten steel cannot be drained and pollutes the molten steel is avoided. Secondary oxidization of the molten steel in the wire feeding process is avoided, dust emission is reduced, and the environment is protected.

The invention discloses a molten steel thermal insulating agent and belongs to the field of thermal insulating agents. The molten steel thermal insulating agent comprises the following components of,by mass, 70-100 parts of carbonized rice husk ash, 1-10 parts of carbon source and 1-30 parts of silicon source, and the carbonized rice hull ash comprises the following elements of, by mass, 2%-17% of C, 40%-60% of Si, and the balance H, O, S, Ca, Fe and P. Water of the carbonized rice husk ash is less than 3% of the total mass of the thermal insulating agent. The bulk density of the molten steelthermal insulating agent is 0.18-0.35 g/cm<3>. Compared with carbonized rice hulls of a honeycomb structure, the molten steel thermal insulating agent provided by the invention can make the surface temperature of molten steel be lowered to 0.78 DEG C.min<-1> from 1.56 DEG C.min<-1> maximally. The molten steel thermal insulating agent provided by the invention is low in heat conductivity coefficient, good in thermal insulating effect, excellent in spreadability, free of caking, and low in production cost.

The invention aims to provide a quenched-tempered heat treatment method for bearing sleeve machining. The heat treatment method comprises the steps that (1) pre-heating treatment is carried out, specifically, a bearing sleeve used in the machining process is made from 20CrMnTi steel, the rough-machined bearing sleeve is preheated to 350 DEG C, and heat preservation is carried out for 30 minutes at a constant temperature; (2) normalizing heating is carried out on the bearing sleeve, specifically, the bearing sleeve which is pre-heated in the step 1 is further subjected to secondary heating to reach 800 DEG C; (3) quenching and cooling treatment is carried out, specifically, cold water is firstly sprayed on the surface of the high-temperature bearing sleeve to carry out cold water cooling, when the temperature of the bearing sleeve is decreased to 530 DEG C, water spraying is stopped, and then the bearing sleeve is immersed into oil for secondary cooling and then is placed in air to be air-cooled to 120 DEG C; and (4) high-temperature tempering treatment is carried out. The method has the advantages that the temperature reduction speed in the quenching process can be decreased, the temperature difference between inside and outside of the bearing sleeve can be reduced, the surface fracture in the quenching process can be avoided, the quenching quality can be improved, and the hardness and the surface wear resistance of the bearing sleeve can be improved.

The invention discloses a natural gas sampling device and a method thereof, which belong to the field of gas sampling. The device comprises a tubular sampling probe, wherein a sampling port is inserted into a natural gas pipe at one end, and a safety bottle is connected with the other end; a heating assembly for heating the tubular sampling probe and the safety bottle; a sampling pump connected tothe safety bottle through a first pipeline; and a sampling air bag, wherein the sampling air bag is detachably connected to the sampling pump through a second pipeline, and the sampling air bag is provided with an intake valve and an outlet valve. The natural gas sampling device provided by the invention can avoid the clogging of the sampling port, and the obtained sample has the advantages of good quality and convenient usage, and is suitable for large-scale popularization and application.

The invention discloses a control method of an air conditioner, the air conditioner and a computer readable storage medium. An outdoor unit of the air conditioner comprises an outdoor heat exchanger,a first fan and a second fan, wherein an air outlet surface of the first fan is opposite to the upper part of an indoor heat exchanger, and an air outlet surface of the second fan is opposite to the lower part of the outdoor heat exchanger. The control method of the air conditioner comprises the steps that after the air conditioner enters a refrigeration mode and the outdoor temperature is less than a first preset temperature, the outlet temperature of the outdoor heat exchanger is obtained, and after the air conditioner enters the refrigeration mode, the first fan and the second fan are in anoperation state; and when the outlet temperature is less than a second preset temperature, the rotating speed of the target fan is reduced, wherein the target fan comprises at least one of the firstfan and the second fan. According to the control method and the air conditioner, the frequency of starting and stopping a compressor is low.

The invention relates to a combustion-heated heating ball, which is a hollow ball body compounded by a fireproof material layer and a combustible material layer, and a centripetal through hole is manufactured on the ball body. By adding the heating ball to the melt liquid metal surface of the high-temperature conveying equipment during the metallurgical production, the combustible material of the ball body is contacted with the oxygen above the melt liquid metal surface to carry out combustion reaction to emit heat under the radiation and heating action of the high-temperature liquid metal, so as to heat the liquid metal and the equipment; at the same time, the fireproof ball housing not only can serve as the carrier of solid fuel, but also can be used for thermal insulation, so as to reflect and block the combusting heat and the heat emitted by the liquid metal, as a result, the heating effect of the heating ball is improved, the thermal insulation function is achieved, the temperature drop speed of the liquid metal is reduced, and the purpose of energy saving is achieved. Due to the heat emitted by the heating ball, the temperature surrounding the openings of the liquid iron ladle and the steel ladle for containing the melt liquid metal in the steel industry is kept very high, as a result, the slag bonding problem on the brims of the liquid iron ladle and the steel ladle is greatly reduced.

The invention belongs to the technical field of molds, and particularly relates to an intelligent constant-temperature injection mold which comprises a body. A plurality of groups of isolation plates are arranged on the side wall of the body. The side, away from the body, of each isolation plate is fixedly connected with a heat preservation flame-retardant material. An air cylinder is fixedly connected to the side, close to the body, of each isolation plate. Gas in gas storage tanks can cause the effect of heat expansion and cold shrinkage and is guided into rodless cavities of the ai cylinders through first gas guide pipes, then the air cylinders push the isolation plates away from the body, the space between the isolation plates and the body is increased, the cooling speed of the body can be increased, and when the temperature of the body is low, the gas in the gas storage tanks is shrunk, the gas in the rodless cavities of the air cylinders is pumped out, so that the isolation plates and the heat-preservation flame-retardant material are close to the body, the temperature reduction speed of the body is reduced, and the heat-preservation effect of the isolation plates and the heat-preservation flame-retardant material on the body is improved.

The invention provides a nano phase-change constant-temperature culture dish which is characterized in that a single-layer structure of a traditional culture dish is improved, a double-layer culture dish in a hollow sandwich structure form is manufactured, a nano phase-change constant-temperature capsule material is injected into the middle of a sandwich layer, and the nano phase-change constant-temperature culture dish is manufactured after the sandwich layer is sealed. According to the culture dish, when the environment temperature rises, the nano phase-change capsule material can absorb andstore external heat, and when the environment temperature is lower than the phase-change temperature, the nano phase-change capsule material can release heat outwards, so that the temperature in theculture dish is kept relatively stable within a certain time range. The invention also provides a manufacturing method of the nano phase-change constant-temperature culture dish.

The invention relates to a phase-change expansion anti-cracking agent for concrete and a preparation method thereof, and the preparation method comprises the following steps: heating polyethylene glycol to a molten state, adding a mixed expansion agent into the molten state, uniformly mixing, adding graphite-phase carbon nitride, uniformly mixing, putting the mixed material into a vacuum drying oven, and carrying out vacuum adsorption, so as to obtain the phase-change expansion anti-cracking agent for concrete. The polyethylene glycol and the mixed expanding agent are adsorbed in the porous structure of the graphite phase carbon nitride, so that the phase change expansion anti-cracking agent for the concrete is prepared. Wherein the mass percentage ratio of the polyethylene glycol to the mixed expanding agent to the graphite phase carbon nitride is (35-49.5%): (49.5-60%): (1-5%). Different active expanding agents are compounded to form the mixed expanding agent, the calcium expanding agent is high in activity and hydration rate and mainly compensates for early-stage shrinkage of the concrete, meanwhile, M-type and S-type MgO expanding agents with different activities are added, shrinkage of the concrete in the middle and later stages is compensated, and therefore compensation shrinkage of the concrete in all stages is guaranteed, and the concrete quality is improved. And the cracking risk of the concrete is reduced.

The invention discloses a novel method for composting fermentation of kitchen garbage. The method comprises the following steps: in the composting fermentation process of the kitchen garbage, mixing iron-carbon particles into a pile body, and continuously fermenting until the pile body is thoroughly decomposed. By utilizing the method disclosed by the invention, the fermentation period can be remarkably shortened, the quality of the obtained bio-organic fertilizer is improved, and meanwhile, the number of beneficial viable bacteria in the bio-organic fertilizer is increased.

The invention provides a temperature control system and method for hot-rolled thin strip steel production. The temperature control system comprises a hot-rolled thin strip steel production line, and rollers, a width and thickness gauge and a stream cooling device are sequentially arranged in the hot-rolled thin strip steel production line in the rolling direction of strip steel; the temperature control system further comprises a heat preservation heating unit, a first temperature sensing unit, a second temperature sensing unit and a control unit; the first temperature sensing unit is arranged at the outlet ends of the rollers, the heat preservation heating unit is arranged between the first temperature sensing unit and the stream cooling device, and the second temperature sensing unit is arranged at the outlet end of the heat preservation heating unit; and the control unit is connected with the heat preservation heating unit, the first temperature sensing unit and the second temperature sensing unit. According to the temperature control system and method for hot-rolled thin strip steel production, the temperature during low-temperature strip steel production can be effectively increased, and the requirement of customers for the strip steel forming quality is further met.