67results about How to "Solve the problem of low temperature" patented technology

The invention provides a control scheme of a VAV (variable air volume) air-conditioning system. A neural network predictive control method is used for a tail end VAV-BOX and an air-conditioning unit, thus the hysteresis characteristic of a VAV system can be overcome, the control accuracy is improved, the resonance phenomena of an actuating mechanism can be greatly reduced, the energy-saving effect is improved by above 13%, and the control parameter tuning problem in the project is solved. A pressure independent cascade stage predictive control method is used for the tail end VAV-BOX, thus thecontrol accuracy can also be improved. The air-conditioning unit is provided with four control loops and can automatically select a static pressure control or total air volume control policy with adjustable setting static pressure by using an all-condition integrated control technology, thus the predictive control on a fan can be realized; the primary air volume of all the tail end VAV-BOXes can be detected and the air supply temperature can be adjusted according to the operation condition, thus the problem of too low temperature in partial air-conditioning area in the lowest fresh air operation is solved; the cascade stage predictive control method is adopted for a fresh air ratio control loop, thus the accurate control on the fresh air ratio can be realized and the energy-saving level can be further improved.

The invention relates to a high-glowing-filament high-CTI (comparative tracking index) super-tough flame-retardant PBT/PC (polybutylene terephthalate/polycarbonate) alloy material and a preparation method thereof. The material is prepared from the following raw materials in parts by weight: 15-70 parts of PBT, 10-25 parts of PC, 10-25 parts of compound toughener, 5-20 parts of bromine flame retardant, 3-10 parts of phosphorus-nitrogen flame retardant, 2-5 parts of inorganic flame-retardant synergistic agent, 0.1-0.5 part of ester exchange inhibitor, 0.1-0.5 part of anti-dripping agent PTFE (polytetrafluoroethylene), 0.1-0.5 part of lubricant and 0.1-0.5 part of antioxidant. The PBT/PC alloy material has excellent comprehensive properties; and the ASTM (American Society for Testing and Materials) notch impact strength is greater than 600 J/m, the flame retardancy reaches UL94V-0, the glowing filament temperature GWIT is greater than 850 DEG C, and the CTI is greater than 600V, thereby greatly widening the application range of the PBT/PC alloy material.

The invention discloses a high-temperature brazing filler metal preparation method and a brazing process for silicon carbide ceramic and composite materials thereof. High-temperature brazing filler metal for the silicon carbide ceramic and the composite materials thereof comprises the following raw materials in proportions: 20-30 wt% of high-purity titanium, and 70-80 wt% of high-purity silicon; and the adding mass of boron carbide or silicon carbide is 0-10 wt% of the total mass of high-purity titanium and high-purity silicon. A silicon carbide brazing joint is prepared by using a vacuum brazing process (the brazing temperature is 1350-1430 DEG C; the insulation time is 5-45 min; and the brazing seam thickness is 10-200 microns). When the welding temperature is 1380 DEG C, the insulation time is 20 min, the brazing seam thickness is 30 microns, and the B4C adding quantity is 5 wt%, the optimal brazing joint is obtained, the maximum room-temperature shearing strength of the joint reaches 114 MPa, and high practical value is achieved.

The invention relates to carbon dioxide capturing equipment and belongs to the field of carbon dioxide gas treatment. According to the equipment, a fan is communicated with an absorption tower by virtue of a pipeline, the bottom of the adsorption tower is sequentially communicated with a liquid rich pump, a rich and lean liquid heat exchanger, a heater and a desorber top by virtue of pipelines, and the bottom of the desorber is sequentially communicated with the rich and lean liquid heat exchanger, a liquid lean pump, a condenser A and the top of the adsorption tower by virtue of pipelines; a filter is arranged on a pipeline which is used for delivering rich and lean liquids; a heating element is connected between the rich and lean liquid heat exchanger and the bottom of the desorber; recovery devices are respectively arranged at the top ends of the adsorption tower and the desorber. In the operating process of the equipment, impurities can be removed, and the heat exchanger is hardly blocked; the temperature of the solution which is preheated and enters into the desorber is appropriate.

The invention discloses a solid lubricating film. The solid lubricating film is characterized by being prepared from the following components in percentage by weight: 36 to 75 percent of a solid lubricant, 10 to 30 percent of talcum powder, 10 to 30 percent of an adhesive, 5 to 20 percent of an improver and 1 to 5 percent of a curing agent; the solid lubricant is prepared from at least two kinds of graphite, boron nitride and molybdenum disulfide; the improver is light magnesium oxide; the adhesive is phenolic resin; the curing agent is urotropin. The invention also discloses a preparation method of the solid lubricating film. According to the scheme, by using the phenolic resin as a carrier, and using the polyethylene glycol 200 as a dispersing agent, the solid lubricating film has a good wetting effect; on the basis of the characteristic of forming gradient lubrication by adding the molybdenum disulfide, the graphite, the boron nitride, the talcum powder and the like, the light magnesium oxide is added, so that the solid lubricating film has high temperature resistance, low temperature resistance, corrosion resistance and good thermal conductivity; meanwhile, the solid lubricating film has unique properties of better filling performance, relatively-high activity, relatively-high adsorption capacity, no toxicity. no harm and the like.

The invention discloses a measuring method of trace oxy-compound in liquid-phase propylene. The measuring method comprises the following steps of heating the liquid-phase propylene to be measured, and controlling the temperature at 90 DEG C to 120 DEG C; feeding the heated propylene into an oxy-compound absorption device through a flow-rate control device to obtain an absorption sample; and detecting the content of the oxy-compound in the absorption sample through the headspace gas chromatography. By utilizing the technical scheme, a constant-temperature bath device is used for heating the liquid-phase propylene, so that the low-temperature difficulty of the sample in daily measurement can be solved; the flow-rate control device is used for making the gas absorption process more stable and the absorption more adequate, so that the trace oxy-compound contained in the liquid-phase propylene is effectively concentrated; and integrating the technical features, the content of the trace oxy-compound in the liquid-phase propylene can be accurately measured by utilizing the headspace gas chromatography in the working field with low level of experimental instruments.

The invention relates to an oil temperature control system of a hydraulic oil tank. The oil temperature control system of the hydraulic oil tank comprises the hydraulic oil tank provided with a hydraulic oil pump; an oil outlet pipeline of the hydraulic oil pump is provided with an overflow valve; an electric heater is further arranged in the hydraulic oil tank; the oil outlet pipeline is provided with a heat exchanger; an oil inlet A of the heat exchanger communicates with an oil outlet of the hydraulic oil pump; an oil outlet B of the heat exchanger communicates with the hydraulic oil tank; in addition, a water tank is further arranged and internally provided with an electric water pump; a water outlet of the electric water pump communicates with a water inlet C of the heat exchanger through a pipeline; and a water outlet D of the heat exchanger communicates with the water tank. The oil temperature control system of the hydraulic oil tank heats hydraulic oil through the electric heater, and the problem that the temperature of the hydraulic oil is too low is solved; the heat exchanger and the water pump are adopted, and the oil temperature of the hydraulic oil tank is fast and accurately controlled; and while the test condition is guaranteed, time is saved and work efficiency is improved. The hydraulic oil pump and an oil return filter are adopted for performing forced filtration on the hydraulic oil of the hydraulic oil tank, pollution of a hydraulic system is avoided, the service life of the system is prolonged, and cost is reduced.

The invention relates to the technical field of semiconductor refrigeration and heating, in particular to a solar vehicle-mounted auxiliary air conditioning system which comprises a solar power module, a gear control module, a semiconductor temperature control module, at least one set of water circulation module and an anti-freezing solution circulation module. The semiconductor temperature control module at least comprises a heating device or a refrigerating device which is formed by stacking a hot end water cooling head, a semiconductor assembly and a cold end water cooling head; the gear control module is connected with the solar power supply module and the semiconductor temperature control module, and is used for controlling the electric energy of the solar power supply module to be transmitted to part and all of the semiconductor assembly according to certain electric power parameters; the solar vehicle-mounted auxiliary air conditioning system has the beneficial effects that the arranged semiconductor temperature control module can rapidly assist the automobile air conditioner to achieve refrigeration and heating, and the arranged gear control module can control the semiconductor temperature control module according to needs; and the semiconductor temperature control module is convenient to control temperature, good in refrigeration effect and high in stability and safety, and the problem that the temperature in the vehicle is too low in winter can be solved.

The invention relates to a special primitive ecological microbial farming method for pigs. The special primitive ecological microbial farming method comprises the following steps: concreting or digging a square pit (1), and digging a sewage pool (2) in one side of the square pit (1); digging row-shaped channels (3) in the bottom of the square pit (1), and digging a converging channel (4) in a junction of the two sides of the row-shaped channels (3); enabling the row-shaped channels (3) to be filled with a replaceable inorganic absorbent material (5); laying an organic fiber material (6) adsorbed with aerobic microorganisms on the square pit (1), and compacting by treading; laying another layer of the organic fiber material (6), and compacting by treading; on the basis of the step 5, diluting a traditional Chinese medicinal disease-preventing agent and serum lactate into 600 times of water, fermenting for five days, pouring into the pit in the amount of 0.4 kilograms per square meter, and farming the pigs into the pit. By the special microbial farming method, manures and urine excreted by the pigs can be effectively decomposed by active microbes, so that the pigs can grow healthily and rapidly.

The embodiment of the invention provides control method and device for a refrigeration fan of a refrigerator, and the refrigerator, belongs to the technical field of refrigeration, and solves the problems that in the prior art, when a compressor of an air direct-cooling type refrigerator is started up, the temperature of a refrigeration chamber or a freezing chamber is low. The method comprises the steps of when the compressor is started up, judging whether the temperature of the freezing chamber is larger than the shutdown temperature of the freezing chamber or not; when the temperature of the freezing chamber is larger than the shutdown temperature of the freezing chamber, determining a difference value between the temperature of the freezing chamber and the shutdown temperature of the freezing chamber to be a first temperature difference; determining a difference value between the temperature of the refrigeration chamber and the shutdown temperature of the refrigeration chamber to be a second temperature difference; and according to a comparison result between the first temperature difference and the second temperature difference, controlling the start-stop proportion of the refrigeration fan, wherein the start-stop proportion is the proportion of the startup time and the shutdown time of the refrigeration fan within a preset period. The control method and device for the refrigeration fan of the refrigerator provided by the embodiment of the invention are suitable for controlling the refrigeration fan.

The invention discloses a technological method for preparing water-soluble low-crosslinking polymaleic anhydride-diisobutylene copolymer salt dispersant. According to the dispersant, a third monomer is added as a cross-linking agent for achieving light crosslinking of a system in the polymerization process, and the usability of the polymerization system is upgraded. The technology that saponification is conducted immediately after the polymerization, organic solvent is removed through the oil-water separation and membrane separation technologies, the defects that in a traditional technology, namely polymerization, distillation and saponification, energy is consumed and the efficiency is low are avoided, the preparation process is simplified, and the preparation efficiency is remarkably improved. The dispersant obtained through the method has the advantages that the water solubility and light crosslinking characteristic are achieved simultaneously, and the crosslinking degree reaches 16.8%-22.7%; the operating temperature is raised, and the glass-transition temperature of polymer reaches 78.5 DEG C-82.5 DEG C; the dispersion force of the system is 95-130 mg/MnO<2> per 100 ml of sample solutions, wherein the concentration of the sample solutions is 0.025%. Therefore, the water-soluble low-crosslinking polymaleic anhydride-diisobutylene copolymer salt dispersant has a good application prospect in such fields as solution polymerized styrene-butadiene rubber, coating dispersion technology and leather tanning agent dispersion technology.

The invention discloses a backwater control method used for a hot-water project and belongs to the field of hot-water project control. The backwater control method includes acquiring water temperature of a thermal-storage water tank and temperature of a backwater pipe through a temperature sensor respectively; responding the water temperature of the thermal-storage water tank and the temperature of the backwater pipe, and comparing the temperature of the backwater pipe with set backwater temperature; judging whether to start backwater control or stop backwater or perform cyclic backwater or not; starting backwater when the interior temperature of the thermal-storage water tank is higher than the backwater temperature and the temperature of the backwater pipe is lower than the set temperature and stopping backwater until the interior temperature of the backwater pipe is higher than the temperature; and starting backwater by a device according to a set time period when the interior temperature of the thermal-storage water tank is lower than the backwater temperature and the interior temperature of the backwater pipe is lower than the set temperature, and stopping cyclic backwater by the backwater device until the interior temperature of the backwater pipe is higher than the set temperature. By the use of the backwater control method, excessively-low interior temperature of the backwater pipe is overcome, and electricity waste caused by continuous backwater is avoided.

The invention provides a control method for a downward air outlet air conditioner and the downward air outlet air conditioner. The control method comprises the following steps that the air temperature in the middle of the bottom of a room is acquired, and the number of heaters is controlled according to the air temperature in the middle of the bottom of the room; if the air temperature in the middle of the bottom of the room is lower than a preset temperature, the number of the heaters is increased according to the air temperature at the lower end of the bottom of the room; and if the air temperature in the middle of the bottom of the room is higher than a preset temperature, the number of the heaters is reduced according to the air temperature at the upper end of the bottom of the room. According to the control method for the downward air outlet air conditioner, downward air outlet of the air conditioner is controlled through a plurality of temperature sensors and the plurality of heaters, and the temperature sensors installed at the different heights are used for acquiring air temperatures of different heights of the room, so that according to the air temperatures of different heights of the room, a warm air control module controls different numbers of the heaters to perform heating, and the problem that the temperature of the bottom of a room is too low when a cabinet air conditioner performs heating in winter is solved.

The invention relates to a cooling device of injection moulding equipment, and specifically relates to an injection moulding machine cooling system. The system comprises a cooling water inlet port that is connected to the cooling part of an injection moulding machine, a cooling water outlet port, and a refrigerating machine for refrigerating the cooling water. The system also comprises a water storage tank for storing cooling water, a feed pump that is connected to the inlet port and the water storage tank, and a controller for controlling on-off of the refrigerating machine, the temperature sensors of the controller are fixed in the inlet port and the channel of the water storage tank, the outlet port is connected to the water storage tank, and the water inlet and the water outlet of the refrigerating machine are both communicated with the water storage tank. The provided cooling system can solve the problems that in the conventional injection moulding machine cooling system, the temperature of the cooling water is too low, and the energy is wasted, and can provide cooling water with a proper temperature.

A semiconductor refrigeration and heat dissipation device is simple and reasonable in structural design, the heat dissipation function can be greatly improved while the temperature of the refrigeration area is well controlled, and a cold conduction sheet can be conveniently detached and replaced. The semiconductor refrigeration and heat dissipation device comprises a semiconductor refrigeration block, and a heat dissipation copper sheet, heat dissipation sheets and a heat dissipation draught fan are sequentially and fixedly arranged at the upper end of the semiconductor refrigeration block. Acold conduction copper block is fixedly arranged at the lower end of the semiconductor refrigeration block, a cold conduction sheet is arranged at the lower end of the cold conduction copper block, and the cold conduction copper block and the cold conduction sheet are in sliding connection through a sliding block and a T-shaped sliding groove in the bottom end of the sliding lock. The sliding block, a temperature detector and a temperature induction controller are fixedly arranged at the bottom end of the cold conduction copper block, and the temperature detector and the temperature inductioncontroller are located on the two sides of the sliding block correspondingly. A plurality of heat dissipation holes are evenly formed in the heat dissipation sheets.