32 results about "Cryogenic freezing" patented technology

This invention relates to the field of coal mine drilling technology and discloses a coal seam fracture water injection dust suppression device and its usage method. The device includes a handle, a liquid nitrogen injection pipe fixedly connected to the surface of the handle, a liquid nitrogen storage tank fixedly connected to the end of the liquid nitrogen injection pipe, and an injection assembly mounted on the handle. The injection assembly includes a nitrogen inlet pipe fixedly connected to the handle, and an arc-shaped ring fixedly connected inside the nitrogen inlet pipe along the liquid outlet direction. In terms of nitrogen injection, the arc-shaped rings form a conical chamber, causing the liquid nitrogen to be ejected in a conical, pressurized manner. Simultaneously, the high-speed jet in the upper half of the conical chamber's cross-section carries a stronger impact force, capable of breaking up a larger area of ​​coal, while the lower-velocity liquid nitrogen in the lower half focuses on cryogenic freezing, assisting fracture expansion through phase change expansion, significantly improving fracture generation efficiency. With the same volume of liquid nitrogen, the utilization rate is higher, indirectly reducing the cost of nitrogen injection.

The utility model relates to the technical field of refrigeration, in particular to an ultralow-temperature freezing storage box. Comprising a box body, a partition plate is arranged in the box body and divides the box body into a refrigeration cavity and a storage cavity, refrigeration equipment is arranged in the refrigeration cavity, a plurality of heat dissipation holes are formed in the side wall of the box body, and guide rails fixedly connected with the box body and the partition plate are arranged at the two ends in the storage cavity; a bearing disc is arranged between the two guide rails, sliding strips in sliding connection with the guide rails are fixedly connected to the two sides of the bearing disc, and elastic limiting mechanisms in limiting fit with the sliding strips are arranged at the tops of the two guide rails. The ultralow-temperature freezing storage box is compact in structure, even in temperature distribution and convenient and fast to operate, the refrigerating efficiency is improved by optimizing the cavity layout and the design of the bearing mechanism, meanwhile, the refrigerating capacity loss risk is reduced, and the controllability and stability of the storage unit are enhanced.

The application discloses a method for manufacturing a large-heat-exchange-capacity low-flow-resistance low-temperature helium cabin, which comprises radiation red copper plates, red copper cooling coil pipes and a helium cabin support, the interior of the radiation red copper plate of the helium cabin is sprayed with special low-temperature black paint to make the internal emissivity greater than 0.92, and the radiation efficiency is greatly improved, the red copper cooling coil pipe adopts three-branch flow parallel cooling of the radiation red copper plate of the helium cabin, the temperature rise of the cooling helium flow is reduced, and the temperature difference of the whole helium cabin is very small, the low-temperature freezing red copper pipe bending process of the special equipment is adopted to ensure that the cooling coil pipe is not concave and wrinkled, the cooling helium flow resistance meets the requirements, the optimized low-temperature tin soldering welding process and the use of red copper pressing sheets and special aluminum foils greatly improve the heat transfer area and ensure the heat transfer efficiency.

The invention discloses a high and steep slope strong freezing and thawing resistant vegetation block and a green low-temperature freezing preparation method and application, and aims at solving the core technical problems that an ecological restoration material is prone to structure instability, water and fertilizer are difficult to maintain, vegetation adaptability is poor, and construction is inconvenient. The method comprises the following steps: uniformly mixing soil, organic matters, a water-retaining agent, hydrothermal carbon and a slow-release fertilizer to obtain a substrate; then adding fibers and carrying out dry mixing to construct a three-dimensional reinforced framework; mixing a cementing agent, and stirring to prepare a flow-state mixture; laying in a mold by adopting a layered structure, and uniformly sowing suitable plant seeds on the surface layer to prepare a plant growing block prototype of the pre-buried seeds; through low-temperature freezing treatment and demolding air-drying treatment, the block is shaped into a block which is stable in structure, can be carried and assembled and is internally provided with a porous framework structure. The vegetation block has mechanical stability, excellent freeze-thaw resistance and ecological functionality, and is especially suitable for rapid ecological restoration of steep slopes in ecologically fragile environments such as Qinghai-Tibet Plateau and northwest cold and arid regions.

The application discloses a device for detecting the compressive strength of concrete under low temperature and high salt fog environment, and relates to the technical field of concrete durability test equipment. The device comprises a shell, an opening and closing device, a liquid adding device, a liquid level sensor, a liquid discharging valve, a liquid temperature sensor, a liquid concentration sensor, a spraying device, a temperature and humidity sensor, a fog concentrator, an air supply device, a heat leading device and a cold leading device connected to the air supply device, a base frame and a compressive strength detector. The device has the advantages that full-automatic closed-loop control can be realized on the liquid level, concentration, temperature of the soaking liquid, air temperature and humidity, and salt fog concentration, the test conditions are stable and repeatable, the multi-component pipes and nozzles of the spraying device are uniformly distributed, natural diffusion and settlement of the salt fog are realized, direct spraying is avoided, the air supply device cooperates with the heat leading device and the cold leading device, uniform heating and cooling are realized through air circulation, direct cold and hot collision is avoided, and the complete deterioration process of "salt fog wetting, low temperature freezing and dry concentration" can be accurately reproduced.

The application discloses a cascade deep-freezing system, which comprises a high-temperature stage circulating loop, a low-temperature stage circulating loop and an evaporative condenser connecting the high-temperature stage circulating loop with the low-temperature stage circulating loop, the evaporative condenser comprises a low-temperature stage condenser on one side and a high-temperature stage evaporator on the other side, the low-temperature stage condenser is connected in the low-temperature stage circulating loop, the high-temperature stage evaporator is connected in the high-temperature stage circulating loop, a spraying loop and a low-temperature freezing loop are further connected to the low-temperature stage circulating loop, and the spraying loop and the low-temperature freezing loop are both in heat exchange with refrigerant in the low-temperature stage circulating loop through unfreezing liquid. Different from the single-step quick-freezing process of the traditional device, the freezing system provided by the application can carry out a two-step freezing process of'spraying initial freezing-low-temperature freezing', so that the loss and volatilization of water can be effectively reduced, and the freshness of food can be locked to the maximum extent.

The application discloses a kind of multi-bubble ice breaking experimental device and experimental method under simulated polar environment, it is related to bubble ice breaking technical field, lack of multi-bubble coupling effect on ice breaking effect research problem is solved.The natural sea ice preparation device is set in controllable refrigeration laboratory;The vacuum controllable low-temperature freezing device of natural sea ice preparation device is set on the upper end of transparent vacuum wall surface freezing box;Vacuum controllable low-temperature freezing device includes rapid controllable freezing plate;The box body bottom of transparent vacuum wall surface freezing box is provided with spark device, the box body left plate, box body right plate and box body back plate of box body are all provided with rapid controllable freezing plate, cooling is generated ice layer to box body by rapid controllable freezing plate, and bubble ice breaking is generated by spark device.The present application realizes ice breaking by the bending moment superposition effect under the coupling effect of multiple bubbles, so as to explore the load characteristics of bending moment superposition under the coupling effect of multiple bubbles, and reveal the action mechanism of bending moment superposition under the coupling effect of multiple bubbles.

The application relates to a low-temperature freeze-drying system which comprises a material chamber, a freezing assembly and a cooling assembly, the material chamber is provided with a plurality of trays, the freezing assembly comprises a plurality of freezing pipes and a vacuum pump, the freezing pipes are in one-to-one correspondence with the trays, and a suction pipe is connected between the plurality of freezing pipes and the vacuum pump. In the application, the freezing pipes and the vacuum pump are arranged, the water in the freezing pipes is recycled, the user does not need to supply water to the low-temperature freeze-drying system all the time, material waste is reduced, the energy-saving concept is embodied, the use cost of the low-temperature freeze-drying system for the user is reduced, the drying assembly is arranged, ice in the material absorbs heat to sublimate to form water vapor, the material is dried, and the storage time of the material is prolonged, the water storage tank is arranged, the vacuum pump is cooled, the vacuum pump is not prone to damage caused by long-time operation in a high-temperature state, and the service life of the vacuum pump is prolonged.

This invention discloses a manufacturing process for a cold chain logistics insulated box and the insulated box thereof, belonging to the field of insulation materials. This invention achieves a synergistic improvement in the thermal conductivity, flexibility, energy storage density, and reliability of cold chain logistics cold storage materials by constructing an expanded graphite-sodium polyacrylate dual-network composite structure. Using a combination of vacuum impregnation and in-situ polymerization, a flexible sodium polyacrylate polymer network is constructed within the three-dimensional thermally conductive skeleton of expanded graphite, forming a rigid-flexible interpenetrating dual-network structure. By controlling the type of phase change material (water-based or eutectic salt system) and the composition of the dual network, the phase change temperature can be precisely adjusted within the range of -21°C to 0°C, covering the full temperature range requirements of fresh food preservation, pharmaceutical cold chain, and cryogenic freezing. The water-based system is suitable for short-term, high-frequency, and cost-sensitive scenarios; the eutectic salt system is suitable for long-term, high-temperature challenges, and high-reliability scenarios, forming a complementary technical solution.

The invention belongs to the technical field related to low-temperature freezing, and discloses array type liquid nitrogen quick-freezing equipment and method based on a multi-mode fluid oscillator, and the array type liquid nitrogen quick-freezing equipment comprises a quick-freezing cavity and a nozzle array arranged in the quick-freezing cavity; the nozzle array is formed by arranging a plurality of fluid oscillator nozzles in an array mode, the fluid oscillator nozzles can convert input continuous liquid nitrogen flow into fan-shaped oscillation jet flow periodically swinging within a preset sweeping angle range, and each fluid oscillator nozzle comprises a fluid oscillator inlet, a fluid oscillator cavity and a fluid oscillator outlet. The fluid oscillator inlet and the fluid oscillator outlet are respectively connected to two opposite sides of the fluid oscillator cavity; the fluid oscillator cavity is divided into two feedback channels and a fluid mixing chamber which are communicated, the two feedback channels are symmetrically arranged relative to the fluid mixing chamber, and the fluid mixing chamber is located between the fluid oscillator inlet and the fluid oscillator outlet. The cold field uniformity and the liquid nitrogen utilization rate are improved.

The invention discloses double-refrigerant rapid refrigeration emergency repair equipment and method, and belongs to the technical field of underground engineering reinforcement, the emergency repair equipment comprises an emergency repair main body, a liquid nitrogen tank and a carbon dioxide freezing refrigeration system, and the method is characterized in that the liquid nitrogen tank is connected with an inlet and an outlet of a low-temperature freezing module in the emergency repair main body through an input pipe and an output pipe; a water leakage point on the freezing wall is blocked by the rescue main body, and the damaged freezing wall is rapidly reinforced by liquid nitrogen; and then continuously supplying liquid carbon dioxide to the emergency rescue main body by using an existing carbon dioxide freezing and refrigerating system in the tunnel, and continuously freezing the emergency rescue main body to buy emergency rescue time for a project. According to the method, an ultralow-temperature refrigeration technology is adopted, the freezing effects of different refrigerants are comprehensively utilized, the frozen wall after the cryogenic freezing connection channel engineering is damaged is rapidly repaired, and the problems of tunnel deformation and collapse are avoided; and meanwhile, the emergency rescue main body is convenient to install and has small influence on the engineering, the engineering risk is controlled within a low intensity range, and the emergency rescue main body can be recycled after emergency rescue is completed.

The invention discloses a cold-chain logistics heat preservation box body preparation process and a heat preservation box thereof, and belongs to the field of heat preservation materials.According to the cold-chain logistics heat preservation box body preparation process, by constructing an expanded graphite-sodium polyacrylate double-network composite structure, collaborative improvement of a cold-chain logistics cold storage material in the aspects of heat conductivity, flexibility, energy storage density and reliability is achieved; a method of combining vacuum impregnation and in-situ polymerization is adopted, a sodium polyacrylate flexible polymer network is constructed in an expanded graphite three-dimensional heat-conducting framework, a rigid-flexible interpenetrating double-network structure is formed, and a phase-change material type water-based or eutectic salt system and double-network composition are regulated and controlled, so that the composite material is prepared. The phase change temperature can be precisely adjusted within the range of-21 DEG C to 0 DEG C, the requirements of fresh food preservation, medicine cold chains and cryogenic freezing full-temperature areas are met, and a water-based system is suitable for short-time, high-frequency and cost-sensitive scenes; the eutectic salt system is suitable for long-time, high-temperature challenging and high-reliability scenes, and a complementary technical solution is formed.

The invention discloses an efficient low-temperature freezing water removal method and device, and relates to the technical field of low-temperature freezing water removal, and the efficient low-temperature freezing water removal device comprises a first-stage freezer, a second-stage freezer, a closed-loop spiral disc, a vibrator and a feeding atomizer. Liquid materials are converted into small-particle-size solid particles which are internally loose and porous through the feeding atomizer and the first-stage freezer, the contact area of the liquid materials and a low-temperature negative-pressure environment in the second-stage freezer can be increased, the migration path of water in the particles is shortened, the water removal efficiency and effect are improved, and after the liquid materials enter the closed-loop spiral disc subsequently, the water removal efficiency is improved. The spiral structure of the closed-loop spiral disc provides a long-path and low-flow-speed motion trail for solid particles, it is ensured that the particles have enough time to make contact with the low-temperature negative-pressure environment in the second-stage freezer, under vibration of the vibrator, the frozen solid particles roll on the closed-loop spiral disc to move, the contact with the low-temperature negative-pressure environment is increased to the maximum extent, and the solid particles are prevented from being frozen. The particle surface is continuously updated, the attachment of water vapor on the particle surface is reduced, and the mass transfer effect is improved.

The utility model relates to a hanging basket type frozen sleep machine, including frame, refrigeration system, placing frame and lift subassembly, refrigeration system is installed in the frame, the frame is equipped with the frozen sleep groove of containing placing frame, refrigeration system is equipped with output end and input end, output end and input end are communicated with frozen sleep groove upper part and lower part respectively, the lift subassembly is equipped with the lifting subassembly, and the lifting subassembly is equipped with the lifting subassembly. The lifting assembly is installed on the machine frame and located above the sleep freezing groove. According to the hanging basket type cryogenic sleep machine, when cryogenic freezing is carried out, the lifting assembly drives the placing frame to descend and be placed in the cryogenic sleep groove, then refrigerating fluid is conveyed through the refrigerating system, enters from the upper portion of the cryogenic sleep groove through the output end and then flows out from the lower portion of the cryogenic sleep groove through the input end. Therefore, a whole flowing circulation is formed through the whole freezing sleeping tank, the flowability is improved, and the freezing efficiency is better improved.

The application discloses an oxygen-rich cooperative multi-mode cold therapy cabin system, which comprises a refrigeration system, an environmental control system, a movable local enhanced cold therapy system, an in-cabin monitoring system, a photodynamic therapy system and a two light distribution structure, wherein the refrigeration system, the environmental control system, the movable local enhanced cold therapy system, the in-cabin monitoring system and the photodynamic therapy system are connected to a main controller; the application provides an ultralow-temperature cryotherapy equipment which can combine oxygen-rich recovery, photodynamic therapy and local position enhanced cold therapy; the refrigeration system cooperates with the environmental control system to realize a wide temperature range of -40 DEG C to -110 DEG C in the cold therapy cabin and realizes a rich and nourishing treatment environment; in combination with the photodynamic therapy system, different physical factors can be provided by the oxygen-rich cooperative multi-mode cold therapy cabin system according to different treatment purposes of patients, so that the treatment effect of the treatment purpose can be achieved.

The application belongs to the technical field of materials, and particularly relates to a kind of cold-resistant PLA composite material and its preparation method. According to the total weight of raw materials 100 parts, the raw material composition of the cold-resistant PLA composite material includes: PLA 45-70 parts, anti-freezing modifier 14-25 parts, reinforcing agent 14-25 parts and compatibility agent 1-5 parts. The application selects polyhydroxyalkanoate as the toughening agent of the main base material, and polycaprolactone as the auxiliary toughening agent. Under the cooperation of the two, the toughness and better low-temperature freezing resistance characteristics obtained are better than those obtained by adding each alone. The nano talc powder is matched with modified starch, the body rigidity is moderate, the film is poked and crystallized while the better low-temperature freezing resistance characteristics are obtained. The acrylate copolymer is used as the compatibility agent, and the anti-freezing modifier produces a synergistic effect, further improving the low-temperature freezing resistance characteristics of the material. The product has obvious effect, and has broad commercial application prospect and market value.

The present application relates to wastewater treatment technical field, and discloses low-temperature freezing sublimation crystallization device for wastewater treatment, including low-temperature freezing tank and the sublimation crystallization box being arranged below low-temperature freezing tank, the top surface of sublimation crystallization box is fixedly installed with inlet pipe, and the outlet end between inlet pipe and low-temperature freezing tank is fixedly installed with the pipe, and the inside of pipe is rotatably installed with the transport dragon, and the processing structure for sublimating wastewater ice is arranged on sublimation crystallization box, the top surface of sublimation crystallization box is provided with the material opening being communicated with inlet pipe, and the inside top surface of sublimation crystallization box is provided with the enlarged opening being communicated with material opening.The present application is broken by reciprocating vibration breaking design of ice assembly, and the transport dragon drives ice roller to rotate, and reciprocating sliding of ice roller is realized by cooperating with guide rod and corrugated guide groove, so that the ice block of wastewater is extruded and vibrated, and the large ice block is quickly broken into small ice, the contact area of ice and sublimation environment is increased, and the rate of wastewater sublimation treatment is improved from the source.

The invention relates to the technical field of wastewater treatment, and discloses a low-temperature freezing sublimation crystallization device for wastewater treatment, which comprises a low-temperature freezing tank and a sublimation crystallization box arranged below the low-temperature freezing tank, a feeding pipe is fixedly mounted on the top surface of the sublimation crystallization box, and a guide pipe is fixedly mounted between the feeding pipe and the discharging end of the low-temperature freezing tank; a conveying auger is rotatably mounted on the inner side of the guide pipe, a treatment structure for sublimating waste water crushed ice is arranged on the sublimation crystallization box, a material opening communicated with the feeding pipe is formed in the top surface of the sublimation crystallization box, and an expansion opening communicated with the material opening is formed in the inner top surface of the sublimation crystallization box. By means of the reciprocating vibration crushing design of the ice crushing assembly, a conveying auger drives an ice crushing roller to rotate, meanwhile, a guide rod and a corrugated guide groove are matched to achieve vertical reciprocating sliding of the ice crushing roller, waste water ice blocks are subjected to extrusion and vibration double crushing, large ice blocks are quickly crushed into small crushed ice, the contact area of the crushed ice and the sublimation environment is increased, and the efficiency is improved. And the wastewater sublimation treatment rate is increased from the source.

The invention relates to the technical field of freeze drying processing, in particular to a low-temperature freeze vacuum dryer which comprises a vacuum chamber, a vacuum pump set, a water catching condenser and an integrated heat pump system. The integrated heat pump system is composed of a compressor, a first heat exchanger, a throttling device, a second heat exchanger and a four-way reversing valve. The second heat exchanger is arranged in the vacuum chamber as a material bearing partition plate, and a micro-channel structure is arranged in the second heat exchanger; and the first heat exchanger and the water catching condenser form a thermal coupling relationship through a heat-conducting bonding material. The equipment is further provided with a multi-mode cooperative controller, and by collecting material temperature gradient, vacuum degree change rate and water catching condenser temperature data, system operation modes are automatically recognized, and parameters such as the rotating speed of a compressor and the opening degree of a throttling device are correspondingly adjusted. Energy recycling is achieved through mode switching of the heat pump system, and the problems that a traditional freeze dryer is low in energy efficiency and insufficient in control precision are solved in combination with an intelligent control strategy.

The invention discloses a coal quality detection and analysis auxiliary device for coal, and relates to the technical field of coal detection. The freezing and crushing mechanism is mounted on the upper side of one end of the freezing cavity and is used for conveying a low-temperature medium into the freezing cavity so as to realize low-temperature embrittlement of the coal sample; the liquid nitrogen storage tank is mounted at the other end of the freezing and crushing mechanism; through cooperative work of a first electric guide rail, a moving block, a telescopic pipe, a low-temperature conveying pipe, an electromagnetic flow valve and a liquid nitrogen flow dividing pipe, low-temperature freezing breaking of a coal sample is achieved, the first electric guide rail drives the liquid nitrogen flow dividing pipe to flexibly move and adjust the position, and liquid nitrogen is conveyed to the liquid nitrogen flow dividing pipe from a liquid nitrogen storage tank through the low-temperature conveying pipe; compared with the coal sample crushing mode of a jaw crusher, the coal sample crushing device has the advantages that the crushing energy consumption is greatly reduced, the problem of high energy consumption of the jaw crusher is effectively solved, and meanwhile, the dust pollution is reduced.

The utility model discloses a multi-bubble icebreaking experimental device and experimental method for simulating a polar region environment, relates to the technical field of bubble icebreaking, and solves the problem of lack of a multi-bubble coupling effect for icebreaking effect research. The natural sea ice preparation device is arranged in a controllable freezing test room; a vacuum controllable low-temperature freezing device of the natural sea ice preparation device is arranged at the upper end of a transparent vacuum wall surface freezing box; the vacuum controllable low-temperature freezing device comprises a rapid controllable freezing plate; an electric spark device is arranged at the bottom of a box body of the transparent vacuum wall face freezing box, rapid controllable freezing plates are arranged on a box body left plate, a box body right plate and a box body rear plate of the box body, the box body is cooled through the rapid controllable freezing plates, an ice layer is generated, and the electric spark device generates bubbles. According to the utility model, icebreaking is realized through the bending moment superposition effect under the multi-bubble coupling effect, so that the load characteristic of bending moment superposition under the multi-bubble coupling effect is explored, and the action mechanism of bending moment superposition under the multi-bubble coupling effect is disclosed.

The utility model discloses an anti-freezing device for a flushing water pipeline of a demister of a desulfurizing tower, which comprises a process water tank arranged indoors, a plurality of water supply pipelines are arranged on the process water tank, a water pump is arranged on each water supply pipeline, each water supply pipeline is respectively communicated with a flushing pipeline used for flushing the demister of the desulfurizing tower, and the flushing pipeline is communicated with the demister of the desulfurizing tower. A first check valve is arranged at the connecting position of each water supply pipeline and the corresponding flushing pipeline, water return pipelines are arranged at the positions, located at the two ends of the first check valves, between the water supply pipelines and the flushing pipelines in a communicating mode, and the inner diameter of the water return pipelines is smaller than that of the water supply pipelines. Water in the flushing pipeline can flow back to the indoor process water tank through the water return pipeline, so that the water in the flushing pipeline is emptied to prevent low-temperature freezing; in addition, the water return pipeline can effectively reduce the flow in the water backflow process, so that the water pump is prevented from reversing, and the purpose of protecting the water pump is achieved.

The present application belongs to the technical field of material environment test simulation, and particularly relates to a test method for simulating freeze-thaw cycles of steel materials in fresh water environment, which comprises sample pretreatment, freeze-thaw cycles, sample characterization, spraying of simulated fresh water solution in the freeze-thaw cycles, then low-temperature freezing and ice formation, followed by high-temperature melting and drying, and repeating. The sample after the freeze-thaw cycles is characterized, and the characterization results show that the test method effectively simulates the surface icing behavior, dry-wet alternating corrosion and coupling damage mechanism in the freeze-thaw process under the temperature cycling condition in the fresh water environment, and can solve the problem that the existing test method fails to simulate the temperature periodic alternation in the fresh water environment, and fill the research gap of the freeze-thaw cycle simulation method of steel materials.

The invention relates to a quick composting method of nano iron oxide by combining freezing-high-temperature pretreatment. The method comprises the following steps: sequentially carrying out low-temperature freezing pretreatment and high-temperature pretreatment on a straw compost raw material to obtain a pretreated compost raw material, and then carrying out aerobic composting on the pretreated compost raw material, optionally, nano iron oxide is added into the pretreated compost raw material. Compared with a traditional composting method, the period is greatly shortened, and the fertilizer efficiency of a compost product is improved; meanwhile, pathogenic bacteria and worm eggs in the raw materials can be thoroughly inactivated in the high-temperature stage in the pretreatment process, and the harmless effect is remarkable. The method also has the characteristics of low energy consumption, simplicity and convenience in management, mild pretreatment conditions, no need of complex equipment and the like, and has good engineering popularization potential. The method is especially suitable for non-heating indoor or outdoor environment in winter in northern China, and effectively solves the problems of slow compost starting and long decomposition period under the low temperature condition.

The present application relates to the technical field of freeze-drying processing, and relates to a low-temperature freeze vacuum drying machine, which comprises a vacuum chamber, a vacuum pump set, a water-trapping condenser and an integrated heat pump system. The integrated heat pump system is composed of a compressor, a first heat exchanger, a throttling device, a second heat exchanger and a four-way reversing valve. The second heat exchanger is arranged in the vacuum chamber as a material-bearing partition plate and is internally provided with a micro-channel structure; the first heat exchanger and the water-trapping condenser form a thermal coupling relationship through a heat-conducting bonding material. The equipment is also provided with a multi-modal collaborative controller, which automatically identifies the system operation mode and adjusts parameters such as the compressor speed and the throttling device opening degree by collecting material temperature gradient, vacuum degree change rate and water-trapping condenser temperature data. The present application realizes energy recycling through mode switching of the heat pump system, and solves the problems of low energy efficiency and insufficient control precision of traditional freeze-drying machines by combining an intelligent control strategy.

This invention proposes a water supply control valve with an anti-freeze and leak-proof structure, comprising a valve body and a pilot valve control assembly. The pilot valve control assembly is disposed between the inlet chamber and the outlet chamber of the valve body. The inlet chamber and the outlet chamber are respectively connected to the inlet pipe and the outlet pipe of the valve body. A detachable filter body is installed inside the outlet pipe. The filter body includes a filter housing and a filter assembly arranged sequentially from the outside to the inside. The filter housing has a filter channel inside, and the filter assembly is installed inside the filter channel. One end of the filter channel has an opening for inserting the filter assembly and an inlet connecting to the outlet chamber, and the other end has an outlet. Several first sealing rings are installed on the outside of the filter housing. This water supply control valve has a good sealing effect and can avoid leakage problems caused by low-temperature freezing and cracking.

The invention relates to a preparation and use method of a gel electric brush galvanization medium, which comprises the following steps: preparing a main salt solution and a gel medium precursor solution, heating the main salt solution to 80-90 DEG C, dropwise adding the main salt solution into the gel medium precursor solution, and heating and stirring the gel medium precursor solution in the dropwise adding process to obtain the gel electric brush galvanization medium. Maintaining the temperature of the gel medium precursor solution to be higher than 90 DEG C, and continuously stirring and heating after dropwise adding until a milk white solution is obtained; placing the milk white solution in a low-temperature freezing environment for not less than 8 hours; and unfreezing in a natural environment to obtain the gel brush plating medium. The coating is uniform and compact, the splashing risk is low, the coating can be used for local plating, and equipment is simple.

The utility model relates to a drawer slide rail assembly for a low-temperature freezer, which comprises a double-wing storage basket, a metal plate left slide groove and a metal plate right slide groove, and the double-wing storage basket comprises a storage basket body, a storage basket left wing and a storage basket right wing; the metal plate left sliding groove and the metal plate right sliding groove are each provided with a lower object containing plane. The storage basket left wing and the storage basket right wing are arranged to be arranged on the lower storage planes of the metal plate left sliding groove and the metal plate right sliding groove in a linear contact sliding mode respectively. The utility model further relates to a low-temperature freezer comprising the drawer sliding rail assembly. The drawer sliding rail assembly slides in a linear contact mode, and the situation that the drawer sliding rail assembly cannot be pulled out due to frost is avoided; the position height of the double-wing storage basket in the low-temperature freezing box can be conveniently adjusted through the arrangement of a sliding groove hook; the upper limiting planes of the metal plate left sliding groove and the metal plate right sliding groove can prevent the double-wing storage basket from falling off suddenly when the double-wing storage basket is pulled out. Due to the design of the front end transition part and the rear end stopper, the double-wing storage basket and the low-temperature freezing box inner container can be prevented from being damaged.

The application provides a centralized double cold source cooling and heating system, which comprises four structures. The first structure comprises a water chiller, a plate heat exchanger, a cooling system, a waste heat system, a chilled water pump, a cooling water pump, a hot water pump, a low-temperature chilled water pump, a high-temperature chilled water pump, an external cooling temperature and humidity control air conditioning unit, an external cooling temperature and humidity control fresh air unit, a fan coil and a regulating valve. The other three structures are slightly adjusted on the basis of the first structure. The application relates to a centralized double cold source cooling and heating system, which is combined with innovative external cooling temperature and humidity control air conditioning / fresh air units and fan coils to realize the functions of summer cooling, summer emergency cooling, dehumidification in the dog days, winter heating and direct winter heating of the centralized double cold source temperature and humidity control air conditioning system, and the functions of non-reheat cooling and heating of the process air conditioning.