37 results about "Cryogenic engineering" patented technology

The invention discloses a wide and thin steel plate with excellent low-temperature toughness for a 355MPa-grade low-temperature engineering structure and a manufacturing method of the wide and thin steel plate, and belongs to the technical field of low-carbon microalloyed steel production. The steel plate comprises the following chemical components in percentage by weight: 0.05%-0.08% of C, 0.2%-0.25% of Si, 1.45%-1.55% of Mn, less than or equal to 0.025% of P, less than or equal to 0.015% of S, 0.02%-0.04% of Nb, 0.010%-0.04% of Al, 0.003%-0.006% of N and the balance of Fe and inevitable impurities, and the total amount of other impurity elements is less than 0.05%. The manufacturing method comprises the steps of molten steel smelting, external refining and degassing, continuous casting, slab reheating, rolling and controlled cooling. The steel plate is low in cost, high in strength and toughness and capable of meeting the service safety of the steel plate for the engineering structure under the condition of-60 DEG C.

The invention relates to the field of vacuum technology and low-temperature engineering, and discloses a low-temperature cold trap device and a vacuum system.The low-temperature cold trap device comprises a shell provided with an extraction opening; the adapter piece is communicated with the shell and is provided with a channel which can be opened or closed; the condensation assembly is arranged in the shell; the cold source is arranged on the shell and exchanges heat with the condensation assembly; the driving mechanism is arranged on the shell and used for driving the condensation assembly to enter and exit from the shell along the channel. The driving mechanism drives the condensation assembly to enter and exit from the shell along the channel, the low-temperature cold trap device can be arranged in the air exhaust pipeline to achieve high cold trap working efficiency during working, the cold trap can be moved out of the air exhaust pipeline during regeneration, shutdown of the air exhaust pipeline is avoided, air exhaust work is not affected, and the service life of the low-temperature cold trap device is prolonged. Therefore, the air exhaust efficiency and the air exhaust performance of the air exhaust pipeline can be ensured.

The invention relates to the technical field of low-temperature engineering, and provides an air gap heat switch and a preparation method thereof and a low-temperature refrigerating system.The air gap heat switch comprises a supporting shell, a hot end component, a cold end component and a gas adsorption component, the hot end component and the cold end component are both arranged in the supporting shell in a sealed mode, and the gas adsorption component is connected with an air gap; a first functional coating is arranged on the surface, facing the air gap, of the hot end component and / or the cold end component, and the first functional coating is used for providing thermal insulation between the hot end component and the cold end component. The air gap heat switch has the functions of gap control and heat insulation, heat insulation is provided when the air gap heat switch is in an off state, heat conductivity is provided when the air gap heat switch is in an on state, the on-off ratio of the air gap heat switch is increased, and it is ensured that the reliability and the vibration resistance of the air gap heat switch in long-term work are enhanced.

The invention discloses maraging stainless steel for low-temperature engineering and a preparation process thereof based on double-aging strengthening and toughening heat treatment, and belongs to the technical field of material heat treatment. The stainless steel comprises the following chemical components: 0.01 to 0.05 percent of C (carbon), 0.1 to 1.5 percent of Mn (manganese), 11.0 to 13.0 percent of Cr (chromium), 6.0 to 10.5 percent of Ni (nickel), 2.5 to 3.5 percent of Mo (molybdenum), 6.0 to 8.0 percent of Co (cobalt), 0.1 to 3.0 percent of Cu (copper), 0.1 to 0.5 percent of V (vanadium), 0.01 to 0.05 percent of Nb (niobium) and the balance of Fe (iron) and inevitable impurities. The forging with the chemical components of the stainless steel is subjected to solution treatment, then subjected to first-time aging at the temperature of 640-720 DEG C, subjected to cold treatment and then subjected to second-time aging treatment at the temperature of 420-580 DEG C; through two-time two-phase region aging treatment, the obtained maraging stainless steel has high strength and high toughness under a low-temperature condition.

This invention relates to the fields of cryogenic engineering and superconducting applications, and discloses a superconducting magnet system using a liquid neon pulsating heat pipe for nitrogen-fixed cooling. The system includes a vacuum chamber, a nitrogen-fixing chamber within the vacuum chamber, a high-temperature superconducting magnet within the nitrogen-fixing chamber, a refrigerator, a T-shaped cooling block connected to the refrigerator's cold head, and a liquid neon cryogenic pulsating heat pipe. The liquid neon cryogenic pulsating heat pipe is thermally connected to the T-shaped cooling block and to the outer wall of the nitrogen-fixing chamber. The high-temperature superconducting magnet exchanges heat with the nitrogen-fixing chamber through nitrogen fixation within the chamber, and the heat is then transferred to the outer wall of the nitrogen-fixing chamber via the liquid neon cryogenic pulsating heat pipe, and then further transferred to the high-temperature superconducting magnet via nitrogen fixation. By placing the liquid neon cryogenic pulsating heat pipe on the outer wall of the nitrogen-fixing chamber, and transferring the refrigerator's cooling capacity sequentially through the T-shaped cooling block, the liquid neon cryogenic pulsating heat pipe, the outer wall of the nitrogen-fixing chamber, and the nitrogen fixation to the high-temperature superconducting magnet, a cooling path combining the liquid neon cryogenic pulsating heat pipe and nitrogen fixation is constructed.

The invention relates to the technical field of refrigeration and low-temperature engineering, in particular to a liquid ammonia circulating device and a germanium spectrometer, the liquid ammonia circulating device comprises a storage tank, a heat exchange assembly and a circulating assembly, the storage tank is internally provided with a first cavity for storing liquid ammonia, and the liquid ammonia exchanges heat with a cold head of the germanium spectrometer extending into the first cavity; the output end and the input end of the heat exchange assembly communicate with the input end and the output end of the first cavity correspondingly to form a liquid ammonia circulation loop used for guiding and conveying liquid ammonia, and the heat exchange assembly is used for conducting heat exchange on the liquid ammonia in the liquid ammonia circulation loop; the circulation assembly is arranged between the storage tank and the heat exchange assembly and provides power for liquid ammonia circulation. By forming the liquid ammonia circulation loop, an appropriate low-temperature environment can be continuously and stably provided for the cold head of the germanium spectrometer, and experiment interruption caused by frequent supplement due to rapid volatilization of a refrigerating medium is avoided, so that the energy resolution and the detection efficiency of the spectrometer are guaranteed, and the energy scale precision of the spectrometer is improved.

The application relates to the field of low-temperature engineering and heat transfer technology and discloses an ultralow-temperature heat pipe system based on nitrogen phase change circulation, which comprises a cold head with a first cold end, a heat pipe body with a second cold end at one end and surrounding the first cold end, the first cold end liquefying nitrogen in the space surrounded by the second cold end into liquid nitrogen, the other end of the heat pipe body being a hot end, the heat pipe body internally having a liquid nitrogen conveying channel communicating the second cold end and the hot end and a nitrogen backflow channel communicating the hot end and the second cold end, and a vacuum interlayer arranged outside the heat pipe body and used for heat preservation of the heat pipe body. The application takes nitrogen as a working medium, completes the phase change circulation of liquefaction and vaporization in the system and does not discharge to the outside, thereby avoiding the safety hazard of the increase of nitrogen concentration caused by the discharge of nitrogen vaporized after liquid nitrogen cooling into the room in the traditional flowing liquid nitrogen cooling mode; the system does not need to frequently supplement liquid nitrogen, can be long-term and stable in operation, improves the use efficiency of the equipment to be cooled, and the setting of the vacuum interlayer improves the refrigeration efficiency.

The application discloses a single-cooling type refrigerating device and a refrigerating method, relates to the technical field of refrigeration and low-temperature engineering, and discloses a magnetic suspension bearing assembly, which is first suspended by a radial magnetic bearing and a thrust bearing without contact, thereby completely eliminating the friction of a traditional mechanical bearing, and the real-time feedback of a displacement sensor matched between the radial magnetic bearing and a main shaft can ensure that the main shaft is stable during high-speed rotation and reduce the loss of vibration, and meanwhile, the friction loss of the thrust bearing tends to be zero, further reducing the energy consumption of the whole machine, and the axial support does not need to involve lubricating oil, so that the situation that the oil film is blocked due to the entry of the lubricating oil into the meshing surface of the scroll disc is avoided, the radial magnetic bearing and the thrust bearing are uniformly controlled by a magnetic suspension controller, a full-dimension non-contact support system of radial constraint and axial balance is formed, and the magnetic suspension technology breaks through the performance bottleneck of a traditional scroll compressor and has significant advantages in energy efficiency, stability and service life.

The present application belongs to the technical field of refrigeration and low temperature engineering, and relates to a kind of contactless natural convection refrigeration device of acoustic levitation droplet, including cooling cavity, ultrasonic assembly, semiconductor refrigeration assembly, position adjusting assembly, droplet injection unit, shooting unit and control unit.The present application can actively maintain the stable suspension state of liquid droplet at the acoustic pressure node while carrying out contactless natural convection refrigeration on the liquid droplet.By coupling acoustic levitation and natural convection cooling, the liquid droplet freely hovers in the standing wave acoustic field, completely avoids the heterogeneous nucleation effect caused by container wall contact, and dynamically compensates the morphology fluctuation in the cooling process by using real-time morphology feedback and closed-loop adjustment of acoustic field spacing, so that the liquid droplet is stably suspended, which not only can simulate the rapid phase transition behavior of supercooled liquid droplet in motion or collision process, ensure the accuracy of dynamic simulation of supercooled liquid droplet icing process and the effectiveness of supercooled liquid droplet collision mechanism research, but also can avoid unstable liquid droplet morphology.

The invention discloses a high-strength steel plate for a high-efficiency low-cost 690MPa-grade low-temperature engineering structure and a manufacturing method of the high-strength steel plate, and belongs to the technical field of low-carbon microalloyed steel production. Optimized steelmaking, heating, rolling, controlled cooling and straightening processes are adopted, and finally the problems of low toughness, high yield ratio, low flaw detection qualification rate and plate shape unevenness of the 690MPa-grade hot-rolled steel plate with the thickness of 10-40mm produced by an online cooling process are solved.

This invention belongs to the field of cryogenic engineering research and application technology, specifically relating to a vacuum socket device for receiving and transferring liquid hydrogen. The device includes a sealing tube I, an outer tube I, a connecting tube I, an integral flange, a sealing tube II, a connecting tube II, an inner tube, a flange shoulder, an outer tube II, a flange ring, a threaded seal, a sealing ring, and a gasket. The protruding structure of the threaded seal, the annular gap B, and the large-diameter end face of the flange shoulder form chamber A. The annular gap A and the shoulder of the sealing tube II form chamber B. Chamber B communicates with an evacuation port machined on the side wall of the outer tube II. When a vacuum is drawn through the evacuation port, chamber B forms a vacuum chamber. The sealed chamber A is located outside the vacuum chamber B. This double-layered chamber enhances the effect of preventing heat exchange between liquid hydrogen and the external environment, significantly reducing evaporation loss of liquid hydrogen during transfer and reception. The socket joint has a flange connection structure, facilitating disassembly and improving the adaptability of the equipment.

A cascade refrigeration natural gas liquefaction system and process, which relate to the technical field of refrigeration and cryogenic engineering. The process may include an ethane refrigeration cycle and a mixed refrigerant refrigeration cycle. Refrigerants according to the present disclosure may include propane, ethane and a mixed refrigerant that may be composed of nitrogen, methane and ethane. Except for nitrogen supplied from public utilities, the refrigerants may be sourced from the natural gas itself. The comprehensive energy consumption of liquefaction per unit according to the present disclosure may be lower than the propane precooling mixed refrigerant process and the conventional cascade process. Although it may be slightly higher than that of the dual mixed refrigerant process in winter working condition, the energy consumption of the dual mixed refrigerant process is exceedingly high in summer, and the total energy consumption of the process of the present disclosure is still low comprehensively.

The invention relates to the technical field of industrial process control and low-temperature engineering, in particular to a phase change anti-freezing control method based on state equation constraint, and overcomes the defects of response lag and non-intrinsic safety of traditional temperature feedback control under a cryogenic transient working condition. The method comprises the steps that the pressure of a refrigerant containing cavity is collected in real time, and the unmeasurable hysteresis freezing risk is mapped into a saturation temperature boundary capable of being instantaneously observed through a thermodynamic state equation (EOS); and constructing a freezing margin index, and when the index is in contact with a safety threshold value, triggering the hard constraint override logic with the highest priority, and forcibly adjusting the gas phase resistance so as to increase the phase change backpressure. According to the method, the sound velocity transfer characteristic of pressure waves is utilized, a physical anti-freezing barrier is established within the millisecond level, relying on postmortem detection and melting remediation in the prior art is not needed, and zero-lag prevention and multivariable decoupling control in the cryogenic heat exchange process are achieved.

The application discloses a dilution refrigerator vibration isolation device suitable for a multi-vibration source environment and particularly relates to the field of refrigeration and cryogenic engineering, and comprises a flexible vibration isolation structure, a mechanical refrigerator vibration isolation structure, a low-temperature thermostat overall vibration isolation frame and a vibration isolation structure of external auxiliary equipment, the low-temperature thermostat overall vibration isolation frame comprises a cross support reinforced frame, the top of the cross support reinforced frame is provided with a low-temperature thermostat support plate, and air damping pads are arranged between the four corners of the low-temperature thermostat support plate and the top surface of the cross support reinforced frame; and the flexible vibration isolation structure is arranged between a mechanical refrigerator cold head and a dilution refrigerator cold plate. The application can effectively isolate multi-source mechanical vibration interference, improve the operation stability and measurement accuracy of a dilution refrigerator low-temperature thermostat, and ensure the smooth and effective operation of important applications, such as quantum computing and extremely low-temperature physical experiments, which require extremely low external interference.

The invention belongs to the field of low-temperature engineering, and discloses a low-temperature liquid supply system using a cavitation pipe assembly. The low-temperature liquid supply system controls flowing of low-temperature liquid through a centrifugal pump, a pipeline, a regulating valve and a cavitation pipe, one path enters the liquid nitrogen injection bent frame through a main path regulating valve assembly to be used by a user, and the other path returns to the liquid storage tank through a backflow regulating valve or controls fluid pressure through a gas-liquid separation tank. And the pressure fluctuation of a fluid working system caused by large-range pressure difference change is overcome by using the cavitation pipe assembly. According to the low-temperature liquid supply system using the cavitation pipe assembly, the maximum supply flow can reach 315 kg / s, the fluid pressure range is 0.3 MPa-1. 15 MPa, the pressure control precision is better than 0.5%, the low-temperature liquid supply system can be used for low-temperature liquid flowing and heat transfer characteristic research, the low-temperature liquid conveying requirement for large-flow and high-precision control is met, and the low-temperature liquid supply system is suitable for large-flow and high-precision control. And the use requirements of a large low-temperature device on low-temperature liquid such as liquid oxygen, liquid nitrogen, liquid argon and liquid helium are met.

This invention discloses a high-efficiency, low-cost 890MPa grade high-strength steel plate for low-temperature engineering structures and its manufacturing method, belonging to the field of low-carbon microalloyed steel production technology. By optimizing the steelmaking, heating, rolling, pre-straightening, relaxation, controlled cooling, and hot straightening processes, the problems of low toughness, high yield strength ratio, low flaw detection pass rate, and plate unevenness in the production of 10-30mm thick 890MPa grade hot-rolled steel plates using online cooling processes are ultimately solved.

The utility model relates to the field of refrigeration and low temperature engineering and infrared, concretely is a kind of throttling refrigerator, it include: air inlet flange, the central position of air inlet flange is equipped with air inlet hole;Heat exchanger, it is set in the upper end surface of air inlet flange, heat exchanger includes the at least two layers of heat exchange pipe of upper and lower layer arrangement, the adjacent two layers of heat exchange pipe are connected, and each layer of heat exchange pipe is spiral disc cloth;Dewar cold finger, it is sleeved in the outer surface of heat exchanger;Beneficial effect is: normal temperature high pressure refrigeration gas enters heat exchanger in the air inlet hole on air inlet flange, in each layer heat exchange pipe inside heat exchanger, then spiral flow in turn, then from the throttling hole of top layer heat exchange pipe, produce throttling refrigeration effect, form low temperature gas, cooling object such as chip is cooled by low temperature gas, by the spiral disc cloth setting of multilayer heat exchange pipe, greatly increase the heat exchange unit number of heat exchanger, to improve the heat exchange efficiency of refrigerator.

The present application relates to the technical fields of cryogenic engineering and superconducting magnet, and particularly relates to a high-coaxiality room-temperature hole structure for a superconducting magnet cryostat. The room-temperature hole structure comprises: a cryostat dewar shell, including a shell with a cylindrical cavity; a room-temperature hole tube, penetrating through two ends of the cryostat dewar shell along a central axis of the shell; a superconducting solenoid magnet, located inside the cryostat dewar shell, the superconducting solenoid magnet movably sleeving the room-temperature hole tube; two-dimensional plane fine adjustment assemblies, used for adjusting the relative positions of the superconducting solenoid magnet and the room-temperature hole tube to realize the coincidence of the central axes of the two; wherein, the two two-dimensional plane fine adjustment assemblies are symmetrically arranged relative to the superconducting solenoid magnet and are respectively mounted at two ends of the superconducting solenoid magnet. In the present application, the room-temperature hole tube and the superconducting solenoid magnet are connected together through the two-dimensional plane fine adjustment assemblies, and the coaxiality between the two can be improved.

The application discloses a quenching device for preparing amorphous alloy and belongs to the technical field of low-temperature engineering equipment, which comprises a spiral pipe, a quenching roller, two joints, a driving device and a cold source circulating unit. The spiral pipe is provided with a pipeline spirally wound and forms a central passage. The two ends of the pipeline are respectively provided with injection holes for injecting amorphous alloy raw materials. The quenching roller is arranged in the central passage and is a pipe structure made of a heat-conducting material. The quenching roller is used for passing in a cold source and performing heat exchange with the spiral pipe. The two joints are respectively connected to the two ends of the spiral pipe and are respectively rotationally connected to the two ends of the quenching roller. The driving device is transmissionally connected to the quenching roller and is used for driving the quenching roller to rotate. The cold source circulating unit is respectively connected to the two joints and is used for circulating the cold source in the quenching roller. The application effectively improves the cooling effect of amorphous alloy forming, realizes the rapid arrangement and cooling of the amorphous alloy, restrains the crystallization of the amorphous alloy, promotes the stable formation of products, and improves the quality of the amorphous alloy.

The application discloses a multifunctional integrated gas control system for a dilution refrigerator, and particularly relates to the field of refrigeration and cryogenics, and comprises a liquid nitrogen cold trap, a gas buffer tank, an integrated valve box, a dilution refrigeration inner circulation pipeline, a diaphragm compressor, a Roots pump, a turbo molecular pump and a vacuum pumping pump group. The system uses a highly integrated valve box module, which is responsible for gas path control in different stages such as starting, running, stopping and rewarming of the dilution refrigeration cycle; the application optimizes the flow conductance of the gas path in different temperature zones and under different pressures, reduces heat loss, and ensures high airtightness in the whole temperature zone from room temperature to extremely low temperature, thereby improving the reliability and automation degree of the dilution refrigerator and having a very positive significance for practical application of the dilution refrigeration system.

The application discloses a hydrogen liquefaction system adopting cascade refrigeration and a separated continuous converter, and belongs to the technical field of refrigeration and cryogenics. The system comprises a normal-pressure precooling cold box, a vacuum deep cooling cold box, a low-temperature adsorber, a compressor set and an expander set. Propylene / carbon dioxide cascade refrigeration is adopted in the precooling section to assist nitrogen cycle refrigeration, and improved double-pressure hydrogen cycle refrigeration is adopted in the deep cooling section. After being cooled by a plurality of heat exchangers and throttled by a terminal throttle valve, raw hydrogen is liquefied. In the product hydrogen passage of the plate-fin heat exchanger in the vacuum deep cooling cold box, normal and secondary hydrogen conversion catalysts are filled and separated from the main heat exchanger, so that the content of secondary hydrogen in the liquid hydrogen product is not less than 98%, 13-25 tons of liquefied hydrogen can be produced per day, and the specific energy consumption of the system is not more than 9.5 kWh / kg of liquid hydrogen. The hydrogen liquefaction system has low energy consumption, the precooling cold box and the deep cooling cold box adopt different design schemes, the continuous converter is separated from the main heat exchanger, and the operation cost, equipment cost and maintenance cost are reduced.

The invention discloses a 900MPa-grade ultrahigh-toughness nickel-based alloy plate in a wide temperature range and a preparation method of the 900MPa-grade ultrahigh-toughness nickel-based alloy plate. The nickel-based alloy plate comprises the following chemical components in percentage by mass: 12-20% of Cr, 1.8-2.2% of Al, 0.8-1.2% of Ti, 0.12-0.18% of Si, 0.25-0.35% of Mn, 2-3% of Nb, 35-44% of Ni, less than or equal to 0.03% of C, 1.5 < = Al / Ti < = 2.5, and the balance of Fe and inevitable impurities. The preparation method comprises the steps of vacuum smelting, electroslag remelting, homogenization treatment, forging, solution treatment and double-aging treatment. The nickel-based alloy plate provided by the invention has excellent mechanical properties and ultrahigh fracture toughness within the temperature range of 298K-4.2 K, and can be directly applied to the fields of low-temperature engineering, aerospace, nuclear industry and the like; and the preparation process is simple, and large-scale batch production can be realized.

The application discloses a high-efficiency low-cost 960MPa-grade high-strength steel plate for low-temperature engineering structure and a manufacturing method thereof, and belongs to the technical field of low-carbon microalloy steel production. By adopting optimized steelmaking, heating, rolling, pre-straightening, relaxation, controlled cooling, hot straightening and tempering processes, the toughness of the 960MPa-grade hot-rolled steel plate with a thickness of 10-50mm produced by the online cooling process is finally solved, the high yield ratio is solved, the flaw detection qualified rate is solved, and the plate shape unevenness problem is solved.

The application belongs to the technical field of steel metallurgical production, and discloses a low-temperature reinforcing steel bar and a production method thereof.The chemical components of the low-temperature reinforcing steel bar include, in percentage by mass, C 0.06-0.20%, Si 0.25-0.50%, Mn 1.20-1.60%, P≤0.025%, S≤0.025%, Al 0.020-0.060%, H≤0.0002%, V 0.06-0.09%, N 0.0045-0.0080%, Ta 0.005-0.015%, Si+6Al 0.42-0.72%, and the rest is Fe and inevitable impurities.The application effectively improves the defects of the existing low-temperature reinforcing steel bar, such as insufficient strength under ultra-low temperature, low total elongation under maximum force, and poor notch sensitivity, and has excellent ultra-low temperature bearing strength and plastic toughness, can effectively inhibit notch stress concentration and crack propagation, avoid ultra-low temperature brittle fracture risk, and significantly improve the service stability and safety reliability of the low-temperature reinforcing steel bar in LNG storage tanks and other ultra-low temperature engineering structures.

This invention relates to the fields of vacuum technology and cryogenic engineering, and discloses a cryogenic cold trap device and a vacuum system. The cryogenic cold trap device includes: a housing with an extraction port; an adapter connecting the housing and having an openable or closable channel; a condenser assembly housed within the housing; a cold source mounted on the housing and exchanging heat with the condenser assembly; and a drive mechanism mounted on the housing for driving the condenser assembly to move in and out of the housing along the channel. This invention, by driving the condenser assembly in and out of the housing along the channel using a drive mechanism, allows the cryogenic cold trap device to operate within an extraction pipe, achieving high cold trap efficiency. During cold trap regeneration, it can be removed from the extraction pipe, avoiding pipe shutdown and not affecting extraction operations, thereby ensuring the extraction efficiency and performance of the extraction pipe.

The invention belongs to the technical field of low-temperature engineering and electronic testing, and particularly discloses an automatic liquid nitrogen supply system for a low-temperature test, which comprises a liquid storage tank, a communicating pipeline, a liquid level sensor and an intelligent control module, the liquid storage tank is used for containing liquid nitrogen; one end of the communicating pipeline is connected to the liquid storage tank, and the other end of the communicating pipeline is connected to the testing tank; the communicating pipeline is sequentially provided with an electromagnetic valve and a mass flow controller in series in the liquid nitrogen flowing direction. The automatic liquid nitrogen supply system for the low-temperature test, provided by the invention, has the advantages of high automation degree, reduction of manual intervention, high control precision and high data reliability and traceability through the structural design and control logic of the system, and the automatic liquid nitrogen supply system has the advantages of high automation degree and reduction of manual intervention. And the safety risk caused by manual intervention is also reduced.

The invention discloses an efficient and low-cost high-strength steel plate for a 1100 MPa-grade low-temperature engineering structure and a manufacturing method of the high-strength steel plate, and belongs to the technical field of low-carbon microalloyed steel production. Optimized steelmaking, heating, rolling, pre-straightening, relaxation, controlled cooling, hot straightening and tempering processes are adopted, an ultra-fast cooling and laminar cooling mode is adopted for controlled cooling, and finally the problems of low toughness, high yield ratio, low flaw detection qualification rate and plate shape unevenness of the 1100 MPa grade hot-rolled steel plate with the thickness of 10-50 mm produced through an online cooling process are solved.

The application discloses a kind of high-efficiency low-cost 1100MPa-grade high-strength steel plate for low-temperature engineering structure and a manufacturing method thereof, and belongs to the technical field of low-carbon microalloy steel production.The optimized steelmaking, heating, rolling, pre-straightening, relaxation, controlled cooling, hot straightening and tempering process is used, the super-fast cooling+laminar cooling mode is used for controlled cooling, and finally the toughness of 1100MPa-grade hot-rolled steel plate with a thickness of 10-50mm produced by online cooling process is low, the yield ratio is high, the flaw detection qualified rate is low, and the plate shape unevenness problem is solved.

The invention discloses a low-temperature cold trap for removing and diluting refrigerant impurities in a refrigerator, and particularly relates to the field of refrigeration and low-temperature engineering, which comprises a top cover plate, a filter main body, a filter element, a presser and a bottom cover plate, the top cover plate is of a circular plate-shaped structure, an air inlet circular hole B is formed in the center of the top cover plate, and a welding opening A1 is formed in one side of the top cover plate. The filtering main body is of a circular-tube-shaped structure, and a welding opening A2 matched with the top cover plate is formed in one end of the filtering main body. Gas flows through the sintered copper powder column through anti-gravity, impurities in the gas are filtered, the number of cold trap component parts is small, the assembly size and assembly procedures are reduced, the pollution characteristic of a traditional activated carbon filter element is avoided, installation and maintenance are convenient, and the service life is long. The micron-sized filtering precision ensures the long-term stable operation of downstream throttling micropores and the stability of long-term repeated starting of the dilution refrigerating machine, so that the maintenance period of the dilution refrigerating machine can be greatly prolonged, and very positive significance is achieved for the practicability of the dilution refrigerating machine.

This invention relates to the field of cryogenic engineering and cryogenic storage technology, and provides a cryogenic liquid storage device. The device includes an outer tank, a first insulation layer, a pump-assisted evaporation cooling screen, a second insulation layer, and an inner tank. An air extraction component and a liquid replenishment component are installed on the pump-assisted evaporation cooling screen. The pump-assisted evaporation cooling screen internally comprises a dispersed evaporation section and a porous liquid absorption core structure. The dispersed evaporation section consists of multi-stage liquid storage pools distributed along the height, dispersing the evaporation process into multiple evaporation surfaces along the height direction. The invention also includes a control module composed of a pressure sensor, a liquid level sensor, and a controller, which can automatically execute the air extraction and liquid replenishment processes. This invention, by introducing a pump-assisted evaporation cooling screen, suppresses the evaporation loss of the cryogenic liquid in the inner tank, and is suitable for long-term, high-reliability storage of cryogenic liquids such as liquid hydrogen and liquid helium.