18 results about "Liquid nitrogen cooling" patented technology

The application discloses a high-temperature superconducting conductor and a preparation method thereof, and relates to the technical field of high-temperature superconductivity, wherein the conductor comprises an inner pipe body and an outer pipe body arranged coaxially, a liquid nitrogen convection cooling zone is formed in the inner pipe body, and a vacuum heat insulation cavity is formed between the inner pipe body and the outer pipe body. By forming the liquid nitrogen convection cooling zone in the inner pipe body and the vacuum heat insulation cavity between the inner pipe body and the outer pipe body, the liquid nitrogen can directly soak the superconducting cable for efficient heat exchange, the vacuum heat insulation cavity effectively blocks the radial conduction of environmental heat to the inner pipe body, and the heat load of the refrigeration system is greatly reduced; by electrically connecting the low-temperature end electrode and the superconducting cable and connecting the room-temperature end electrode and the low-temperature end electrode in series to form a loop, the room-temperature end electrode is avoided from directly contacting the superconducting cable, the axial heat leakage along the electrode is reduced, and one end of the liquid nitrogen cooling pipe is communicated with the inner pipe body and the other end of the liquid nitrogen cooling pipe extends to the outside through the outer pipe body, so that the stable supply and the sealing reliability of the liquid nitrogen are ensured.

This application relates to the field of aluminum profile extrusion technology, specifically disclosing a method and system for controlling liquid nitrogen cooling of aluminum profile extrusion dies. The method includes the following steps: continuously collecting multi-source temperature data and operating status data of the extrusion production line within a preset historical period; establishing a mapping relationship between operating status and temperature response, and predicting the operating status change sequence; generating die temperature prediction curves and profile temperature prediction curves based on the operating status change sequence and the mapping relationship; calculating the deviations from the corresponding preset temperature control targets, generating die cooling demand curves and profile cooling demand curves, and adjusting the injection strategy of the liquid nitrogen injection device to perform cooling intervention in advance. The technical solution of this application can calculate the cooling demand curve matching future heat load changes in advance and drive the liquid nitrogen injection device to perform forward-looking flow and mode adjustments, overcoming the response lag problem caused by thermal inertia in traditional control.

This invention discloses a gas release system and method for advanced coal seams in fully mechanized coal mining faces, comprising a scraper conveyor, a support arm, an installation plate, a microwave radiation component, a conveying cylinder, a sealing component, a drive component, and a control component. The gas release system for advanced coal seams in fully mechanized coal mining faces actively promotes gas desorption and release by creating cavities in the coal seam in the advance roadway and utilizing the physical effects of microwave heating and liquid nitrogen cooling. This transforms passive waiting for dilution into proactive source control, significantly reducing the instantaneous gas outburst during coal cutting operations, effectively avoiding frequent shutdowns due to excessive gas levels, and significantly improving the continuous operation time and overall production efficiency of the fully mechanized mining face. Simultaneously, the system can dynamically optimize extraction parameters based on real-time feedback, ensuring that gas extraction efficiency and safety are always in optimal balance, achieving intelligent and precise prevention of coal mine gas disasters, and providing technical support for safe and efficient coal mining.

The application discloses a grain refinement preparation process for improving the fatigue strength of titanium alloy rod for medical devices, which comprises continuously rolling titanium alloy coarse rod into finished fine rod; a water quenching tank is arranged on one side of a multi-roller rolling mill for continuous water quenching; after the whole finished fine rod is water quenched to a temperature at which the grains no longer grow, the grain refinement is completed by taking out the finished fine rod from the water quenching tank. The preparation process realizes integrated rolling and online instant water quenching process, directly enters the tank for water quenching in a high-temperature state at the end of rolling, and has no transfer, no secondary heating, no time interval, and extremely fast water cooling at a critical phase change temperature to refine the grains, so that the grain size is ≤7 microns, the metallographic grade is A, and the fatigue strength theoretical analysis (calculation) is ≥500 MPa, and the process is suitable for medical device implantation requirements such as artificial joints, spinal fixation nails and intramedullary nails. The process discards high-cost secondary heat treatment and liquid nitrogen cooling, and significantly improves implant safety and mass production efficiency.

The application relates to a liquid-air alternating quenching method of 13Cr15Ni4Mo3N stainless steel, which comprises the following steps: (1) after austenitizing, the 13Cr15Ni4Mo3N stainless steel workpiece is subjected to cyclic alternating quenching treatment of water cooling and air cooling until the workpiece is cooled to room temperature; (2) the workpiece at room temperature is continuously subjected to cyclic alternating quenching treatment of deep cooling and air cooling until the workpiece is cooled to a set deep cooling temperature; (3) finally, the workpiece cooled to the deep cooling temperature is taken out for air cooling, and the liquid-air alternating quenching is completed. Compared with the prior art, the application can provide any cooling intensity between water quenching and air cooling in the high-temperature-to-room-temperature section, provide the cooling intensity of the fastest liquid nitrogen cooling speed in the low-temperature section, and control the final deep cooling temperature, so that cracking in the deep cooling process is avoided, and the quenching cooling and deep cooling requirements of products of different sizes are met.

This invention discloses a drilling fluid surface cooling device and method. The device includes: a liquid nitrogen cooling tank having a liquid nitrogen cooling chamber and a liquid nitrogen injection port and a nitrogen recovery port communicating with the liquid nitrogen cooling chamber; a liquid nitrogen recovery mechanism, the input end of which is connected to the nitrogen recovery port; a liquid nitrogen injection mechanism, the input end of which is connected to the output end of the liquid nitrogen recovery mechanism, and the output end of the liquid nitrogen injection mechanism is connected to the liquid nitrogen injection port; and a drilling fluid cooling pipeline installed in the liquid nitrogen cooling chamber, with one end of the drilling fluid cooling pipeline extending from the liquid nitrogen cooling tank and forming a high-temperature drilling fluid inlet, and the other end of the drilling fluid cooling pipeline extending from the liquid nitrogen cooling tank and forming a cooling drilling fluid outlet. The drilling fluid cooling pipeline is connected to the surface portion of the drilling fluid circulation loop through the high-temperature drilling fluid inlet and the cooling drilling fluid outlet. This invention can achieve efficient cooling of the drilling fluid and can meet the cooling requirements of the drilling fluid by controlling the liquid nitrogen injection volume of the liquid nitrogen injection mechanism.

The application discloses a preparation method of a high-manganese-steel surface laser cladding high-performance cobalt-based alloy coating and application of the high-manganese-steel surface laser cladding high-performance cobalt-based alloy coating in mine machinery wear-resistant parts, and belongs to the technical field of wear-resistant composite material surface strengthening. The preparation method comprises the following steps: substrate pretreatment, alloy powder preparation, three-dimensional modeling and cladding path planning, argon protection laser cladding, and post-processing. The raw material is strictly controlled to be in a high-purity form with P and S being less than 0.02%, the alloy powder is made into spherical powder through double-stage atomization and annular liquid nitrogen cooling, and the powder is modified by nano Al2O3 to refine grains and improve powder properties. The cladding adopts a spiral path, the post-processing is first air cooling / water mist cooling and then annealing at 380-420 DEG C, and finally polishing is performed, so that the coating has a three-section hardness gradient, the cladding positions of the layers are clear, and the microstructure is an austenite matrix dispersedly combined with carbide phases. The coating has high toughness and hardness and excellent wear resistance, can be adapted to different working conditions of mine machinery wear-resistant parts, the process is controllable, and is suitable for industrial production.

The present invention relates to the field of transient dynamics and catalytic surface and interface research, and provides a pump-probe TAP instrument. The pump-probe TAP instrument provided in the present invention comprises a sample injection pulse system, a micro-reactor, a liquid nitrogen cooling system, a mass spectrometry system, and a vacuum system; the vacuum system comprises a first vacuum cavity, a second vacuum cavity and a vacuum pump group which are connected in sequence, and the side wall of the first vacuum cavity is provided with a vacuum gauge having a working end extending into an inner cavity of the first vacuum cavity; the liquid nitrogen cooling system comprises an annular liquid nitrogen cavity provided in the first vacuum cavity; the sample injection pulse system comprises a pulse flange provided on the top of the first vacuum cavity, a first pulse valve and a second pulse valve are provided in the pulse flange, and an included angle α is formed between the first pulse valve and the second pulse valve; the pulse flange is also provided with a condensed water piping channel for accommodating condensed water piping; the micro-reactor is provided at the bottom of the pulse flange, the pulse flange is further provided with a pulse channel, the first pulse valve and the second pulse valve are connected to the top of the micro-reactor by means of the pulse channel, and the micro-reactor is suitable for loading a sample; the mass spectrometry system comprises a mass spectrometer, the mass spectrometer is provided on the side wall of the first vacuum cavity, and a mass spectrometer filament of the mass spectrometer extends to the center of the first vacuum cavity; and the bottom of the micro-reactor is further provided with an extension tube extending towards the mass spectrometer filament and located above the mass spectrometer filament. By means of the arrangement, the present invention can realize experiments involving continuous pulses, intermitt

The application discloses a humanoid industrial robot and a nitrogen constant-temperature protection system for general digital electric appliances, and belongs to the technical field of equipment thermal management and air-tight protection. The application is based on the iteration optimization of two nitrogen protection patents of the applicant, and is provided with a double-cavity selection, modularized hierarchical selection, hidden pressing air supplement, three-level temperature control and three-working-condition operation structure, so that the problems of heat leakage, aging of components and elements, battery thermal runaway and damage of household appliances at high and low temperatures of the robot cavity are solved. After the cavity is vacuumized, high-purity nitrogen or liquid nitrogen is filled, a motor full-air-bag and a dynamic air-tight structure are provided, and air-bag sealing or self-sealing of the body can be selected; three gears are configured according to power: static protection, fan auxiliary cooling, closed nitrogen circulation and liquid nitrogen cooling, which can be independently used or used in combination with air cooling, water cooling and liquid cooling. The product is suitable for humanoid robots, digital appliances, household appliances and refrigeration supporting equipment, supports pre-installation before leaving the factory and non-destructive modification of finished products, and is suitable for a wide range of applications.

The present disclosure relates to a hydrogen liquefaction system and method capable of recovering energy, which comprises a pressure control unit, a precooling and rewarming unit, a liquid nitrogen cooling unit, a hydrogen liquefaction unit and a comprehensive heat exchange unit. The system of the present disclosure can maximize the recovery and utilization of energy in the hydrogen liquefaction process, thereby improving the utilization rate of energy.

This invention discloses a switching power supply system and control method for a high-temperature superconducting nuclear fusion device, relating to the field of power supply technology for nuclear fusion devices. It includes: a step-down transformer; a power electronic conversion unit, including an electromagnetic interference filter, a three-phase rectifier circuit, a DC support capacitor, and a bidirectional switching inverter circuit, for outputting an adjustable duty cycle PWM voltage to generate a controlled current to drive the load; a switching network unit, which generates a breakdown voltage by turning off the first semiconductor switching unit during the initial breakdown phase, allowing current to flow through the corresponding breakdown resistor; a discharge unit, used to discharge magnetic energy in the load using a discharge resistor during the demagnetization phase; the system also includes a control unit for coordinating the actions of each unit according to the plasma discharge phase. The inductive superconducting load is a poloidal field coil wound from a high-temperature superconducting material and adapted to a liquid nitrogen cooling environment. This invention aims to reduce the cooling cost of nuclear fusion devices and achieve precise control of plasma configuration and current.

The utility model discloses a refrigeration assembly device of conical crusher base bushing based on liquid nitrogen cooling, including base, the closed casing upper end one side intercommunication installation has nitrogen gas exhaust port, and the closed casing side upper end penetrates and inserts and is installed with detection mechanism, the both sides lower extreme fixed connection of closed casing has locking buckle groove, locking lever and locking buckle groove insert and install, and locking lever outer wall sleeve and install has locking nut. This refrigeration assembly device of conical crusher base bushing based on liquid nitrogen cooling can be more even spraying to liquid nitrogen through liquid guide pipe, shower nozzle, shunt pipe, and through sealing washer, positioning buckle groove, positioning buckle block, locking lever, locking nut, locking buckle groove, the closed casing is sealed with base seal cover, forms sealed heat preservation structure, avoids the shell after the nitrogen import to carry out the heat conduction to the outside, causes the loss of energy, and can be real -time detection adjustment through detection mechanism, and the automation is higher, and the use effect is better.

The utility model discloses a kind of dry cleaning devices for semiconductor parts, more specifically in the technical field of semiconductor parts cleaning, including the cleaning tank with hinged sealing door, the inside of the cleaning tank is sequentially provided with liquid nitrogen cleaning assembly and blowing assembly.The utility model is by being provided with low-temperature cleaning assembly, so that the device has low-temperature cleaning function, utilize the low temperature and impact force of dry ice particles to remove the large particle pollutants on parts, reduce subsequent cleaning pressure, then use liquid nitrogen cooling to make microscopic pollutants brittle, adopt dry ice and the double medium collaborative cleaning mode of liquid nitrogen, not only can realize to semiconductor parts all-around, multilevel depth cleaning, more avoid the risk that single medium causes due to excessive effect and causes pollutant residual accumulation or aggravate with parts, while guaranteeing the integrity of parts surface material, provide more reliable, stable super-clean cleaning guarantee for semiconductor manufacturing.

The application discloses a waste asphalt mixture fine separation system capable of avoiding gradation refinement and a working method thereof. The system comprises a control room and sequentially connected material selection devices, belt conveying devices, elevators, liquid nitrogen cooling devices, stripping machines, vibrating screens, high-frequency screens, finished product conveying devices and stock bins. The liquid nitrogen cooling device comprises a weighing device, a cooling device and a collected material conveying device. The weighing device comprises a distribution box. The cooling device comprises a liquid nitrogen conveying pool and a cooling liquid circulating pool. The collected material conveying device comprises a feeding port, a collected material conveying bin, a motor set box and a discharging bin. The feeding port is arranged on the distribution box. The outlet of the distribution box is connected with the inlet of the collected material conveying bin. The outlet of the collected material conveying bin is connected with the discharging bin. The liquid nitrogen conveying pool and the cooling liquid circulating pool are arranged at the bottom of the collected material conveying bin. The motor set box is arranged between the liquid nitrogen conveying pool and the cooling liquid circulating pool. The application avoids gradation refinement and reduces the clumping rate and variability of RAP.

The application discloses a wind-solar complementary comprehensive energy system based on closed element circulation, which comprises an energy collection module, a gas treatment and element circulation module, an energy storage and regulation module, a cooling module and a control system. The energy collection module comprises a house-buried double-stator triple magnetic suspension wind turbine and a photoelectric conversion assembly. The house-buried double-stator triple magnetic suspension wind turbine is composed of an upper stator, a lower stator, a turbine blade integrated magnetic suspension rotor and a detachable main shaft with a jack. The upper stator and the lower stator are both provided with a power generation coil and a liquid nitrogen cooling channel. The skeleton of the turbine blade integrated magnetic suspension rotor is embedded with a permanent magnet array and a superconducting bulk material at the upper end and the lower end. The main shaft is internally provided with a liquid nitrogen main pipeline. The intermittent nature of wind-solar electricity is solved. Through the dual mode of 'wind-solar electricity energy storage + combustion energy supply', the system can still generate electricity through stored methanol, carbon powder and methane when there is no wind and sunlight, so that the system can run for 24 hours.

The application discloses a coal mine underground liquid nitrogen cooling system and relates to the technical field of coal mine refrigeration. The nitrogen gas is produced by a nitrogen generator, the temperature of the produced nitrogen gas can be reduced by the arrangement of a first cooler and a second cooler, and in the second cooler, the liquid nitrogen is heat-exchanged with the produced nitrogen gas to be vaporized. The vaporized nitrogen gas and the unvaporized liquid nitrogen enter a conveying pipeline and are finally sent to a working face needing cooling together with the cooled produced nitrogen gas, so that the cooling and fire prevention and extinguishing purposes are achieved. The liquid nitrogen is used in cooperation with the nitrogen generator through the second cooler, the nitrogen generator can be arranged on the ground, the heating influence of the nitrogen generator on the underground environment during the production of the nitrogen gas is avoided, the use amount of the liquid nitrogen can be saved, and therefore the production cost is reduced.

This invention discloses a test device for the internal flow characteristics of a cryogenic liquefied natural gas (LNG) storage tank, comprising a vacuum pump, a vacuum pipeline, a test chamber, a test pipeline, and a support skid. The test pipeline is located outside the test chamber and connected to it, and both the test chamber and the test pipeline are mounted on the support skid. The test chamber, from the outside in, includes a vacuum chamber, a liquid nitrogen cooling screen, and an LNG inner chamber. The outer surface of the LNG inner chamber is equipped with an electric heating element, and a temperature sensor is installed inside. The vacuum chamber works together to form a vacuum-insulated environment, the liquid nitrogen cooling screen is used to cool the LNG inner chamber, and the electric heating element is used to heat the LNG inner chamber. The vacuum pump is connected to the vacuum chamber of the test chamber via a vacuum pipeline. This invention enables direct testing of the internal flow characteristics of LNG and other multi-component cryogenic mixed working fluids, solving the problem that existing technologies cannot reproduce real-world operating conditions; it also achieves precise control of boundary heat flux, improving test accuracy; and it can accurately capture flow field characteristic parameters.