28 results about "Cold finger" patented technology

This infrared radiation detector comprises: – a cryostat equipped with a cold finger, suitable for heat exchange with a cold source, and a window transparent to the infrared radiation to be detected; – a cold plate, mechanically fixed and in heat exchange with the cold finger; – a detection block comprising at least one detection matrix sensitive to the range of infrared wavelengths to be detected, and in heat exchange directly or indirectly with the cold plate; – a cold screen mechanically fixed and in heat exchange with the cold plate and suitable for limiting parasitic radiation, the cold screen being equipped with at least one diaphragm or baffle (9), oriented radially with respect to the general orientation of the detector, and equipped with an opening suitable for allowing the transit of the optical path resulting from the incident radiation.The free edge (13) of said at least one diaphragm or baffle (9) is structured so as to define non-linear patterns (14). Figure for the abbreviation: Fig 6.

Embodiments of the present invention provide a frost point hygrometer apparatus utilizing dry ice and ethanol, or liquid nitrogen, as cryogenic coolant. FPH apparatus in accordance with embodiments of the present invention includes a copper cold finger with a sink immersed in a liquid cryogen to provide cooling power throughout the profile, a polished mirror disk residing at the opposite end of the cold finger with ambient air passing over it, a nichrome heater wrapped around the narrow shaft of the continuous cold finger and mirror piece to provide heat to the mirror, an optical source and detector, including an infrared light-emitting diode and a photodiode, to monitor the mirror's reflectivity as condensate accumulates in the form of dew or frost, a biconvex lens to focus the light reflected from the mirror into the photodiode, and a calibrated thermistor embedded in the mirror to measure the frost point temperature.

The application discloses a low-vibration active phase modulation composite pulse tube Stirling cryogenic refrigerator and belongs to the technical field of cryogenic refrigerators. The composite refrigerator cold finger integrates a first Stirling component as a high-temperature stage and a second pulse tube component as a low-temperature stage. The innovation is that the phase modulation unit of the second pulse tube component is composed of a second inertia tube wound and fixed in the inner circle of the gas reservoir, and the gas reservoir is integrally connected to the first cold end heat exchanger to improve the system efficiency through low-temperature arrangement. At the same time, the motion state of the compressor piston and the first displacer is monitored and cooperatively controlled in real time through the compressor displacement sensor and the cold finger displacement sensor, active and accurate phase modulation is realized, and the active vibration damper is used to perform reverse compensation according to the motion feedback of the first displacer to significantly offset the vibration output of the whole machine. The application realizes the unity of high efficiency, low vibration and high reliability, and is particularly suitable for vibration-sensitive space exploration and other application scenarios.

This invention discloses an ultrasonic-cold finger coupled plate melt crystallizer and a continuous purification process. The crystallizer body includes multiple heat exchange plates, each with a built-in serpentine refrigerant channel; multiple ultrasonic vibrating plates are sequentially arranged around the shell of the plate melt crystallizer to provide an ultrasonic field covering the entire crystallizer body; at least one cold finger assembly is located on top of the plate melt crystallizer and connected to the upper cover plate of the crystallizer body via a detachable flange. The cold finger assembly includes an inlet manifold, an outlet manifold, a cold finger body, and an ultrasonic probe. The inlet and outlet manifolds are arranged parallel to each other above the crystallizer body along a second direction. The bottom of each cold finger body is located within the crystallizer body, and its top two ends are connected to the inlet and outlet manifolds, respectively. The ultrasonic probe extends along a third direction and is inserted into the interior of the cold finger body. Using the melt crystallizer and process of this invention enables higher crystallization efficiency and greater product yield.

The invention relates to the technical field of oil gas recovery treatment, and provides a lubricating oil gas treatment system, and a pulse tube refrigeration device is arranged at an exhaust port of an oil tank, so that a condenser is located between the exhaust port and an inlet of an exhaust pipeline. When the lubricating oil gas is increased and the air pressure is increased, the lubricating oil gas enters the condenser of the pulse tube refrigeration device and is in full contact with condensation sheets of the condenser, and the condenser leads out heat through a cold finger, so that the lubricating oil gas is liquefied and flows back into a lubricating oil tank, and the recycling of the lubricating oil gas is realized; and the air pressure in the lubricating oil tank is controlled, so that the lubricating oil in the oil tank can work normally. According to the lubricating oil gas treatment system, the structure is simple, the condensation single bodies in the condenser can be detached and replaced, and the maintenance difficulty and cost are reduced. Meanwhile, oil gas of the lubricating oil is fully treated, and pollution to the environment is avoided.

The utility model belongs to the technical field of single crystal continuous casting, and particularly relates to a small-diameter metal wire single crystallization treatment device which is characterized in that a guide tube, a crucible and a casting mold are sequentially arranged in a quartz tube along the axial direction, a cooler sleeved outside the casting mold is arranged at the right end of the quartz tube, and a cold finger is connected to the right side of the cooler; induction coils are correspondingly arranged on the outer side of the quartz tube and the left side of the crucible and the casting mold, the induction coils extend from the left end of the crucible to the casting mold, and the distance between every two adjacent coils is gradually increased; the ratio of the axial length of the cold finger to the axial length of the casting mold is a fixed value. According to the technical scheme, by improving the single-crystallization treatment device for the small-diameter metal wire, continuous heating and melting, continuous dummy ingot and continuous feeding of a matched system are achieved, and the limitation of the single-crystal continuous casting technology on the diameter and length of the prepared single-crystal wire can be solved.

The application relates to a high-reliability cryocooler micro-vibration insulation system and belongs to the technical field of satellites; a support Dewar is installed on the upper surface of a cold finger flange; a coupling substrate is placed on the top of the support Dewar; the top end of a support column is connected with the coupling substrate, and the bottom end is connected with the cold finger flange; a pyrotechnic cutter and a conductive sensor are arranged on the support column; a detector Dewar cover is installed on the coupling substrate; a splicing substrate is installed on the coupling substrate; a detector device is installed on the splicing substrate; a cryocooler cold head extends into the inner cavity of the support Dewar from the bottom of the cold finger flange; a flexible cold chain is arranged on the top of the cryocooler cold head and is connected with the coupling substrate; a vacuum pump is in communication with the detector Dewar; a water cooler is in communication with the cold finger flange; the application can not only guarantee that the launch section effectively supports the detector assembly but also guarantee that the support end and the detector assembly are physically isolated during the in-orbit period, so that the micro-vibration generated by the cryocooler during in-orbit work is insulated from the detector.

The invention provides a waste salt treatment process and system based on a melt crystallization method, the waste salt treatment process is a process combining pulling crystallization, zone condensation and cold finger / cooling plate crystallization, and matrix salt is recovered from a chloride molten salt system containing strontium element and / or barium element and / or cesium element. The invention aims to solve the problems that the treatment scale and the product purity are difficult to consider at the same time, the volatilization loss is serious, and dual targets are difficult to realize under complex working conditions in the existing dry post-treatment waste salt melt crystallization purification technology. A waste salt melt crystallization purification technology which can adapt to complex working conditions, give consideration to high purification efficiency and high resource recovery rate and meet the large-scale treatment requirement is researched and developed, radioactive waste salt containing splitting elements is treated through process fusion, efficient purification of the waste salt is finally achieved, and the high removal rate and recovery rate are achieved.

The application relates to an expander assembly and a Stirling refrigerator, which comprises an expander base, a cold finger in sealed connection with the expander base, a pusher assembly in the expander base and the cold finger, and an expansion cavity formed by the cold finger and the pusher assembly; and a magnetic spring assembly arranged close to the expansion cavity and used for generating a magnetic force applied to the pusher assembly, wherein the action direction of the magnetic force is opposite to the movement direction of the pusher assembly during movement. The magnetic part of the application is continuously in a low-temperature environment, so as to continuously have a larger magnetic flux, and the magnetic part is prevented from falling off due to debonding, and meanwhile, the overall volume of the product is further reduced, so that the product structure is more compact.

The utility model belongs to refrigerating machine technical field, concretely provides an expander, including cold finger protection cylinder and the base connected in cold finger one end, the cold finger is inlaid with the cold accumulator of sliding, the cavity that base and cold finger enclose forms is equipped with the guide piston, one end of guide piston is fixedly connected with base, the other end sliding sleeve joint has guide cylinder, guide cylinder with cold accumulator is connected. The utility model provides this kind of expander of improvement guide piston and guide cylinder's relative motion structure, make guide cylinder move forward and backward relative to piston after being subjected to gas force, carry out gas compression and expansion to refrigerate, guide piston can be integrated with expander base and process, reduce processing cost. Simultaneously still can join magnetic force spring subassembly, replace leaf spring in axial direction and carry out the location, can effectively reduce the risk of cylinder collision.

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 invention discloses a high-reliability space mechanical refrigerator system-level micro-vibration suppression system, and relates to the technical field of micro-vibration control, the high-reliability space mechanical refrigerator system-level micro-vibration suppression system comprises a compressor, a refrigerator cold finger, a mounting bracket, a flexible cold chain, a mounting substrate and an active vibration reduction and refrigerator driving integrated circuit, a force sensor group in a four-point layout is adopted between a refrigerator mounting bracket and a mounting substrate, and 12 interface force signals are collected in real time to serve as global feedback; meanwhile, a redundant active vibration reduction assembly composed of four vibration absorbers is installed on the side face of the support. The defects of acceleration feedback non-co-location control are overcome, the problems that a traditional passive vibration isolation system is low in low-frequency vibration isolation efficiency, a locking and releasing mechanism needs to be additionally arranged on a transmitting section, and consequently the structure is complex are solved, and the reliability of an aerospace task is remarkably improved.

The application discloses a precision assembling method of an infrared detector process Dewar, and belongs to the technical field of Dewar assembling of infrared detectors. The method comprises the following steps: cleaning and pretreating materials, and assembling a cold finger and a detector. In the application, the method adopts a nanometer-level thermal interface of the cold finger and the detector chip, can effectively guarantee thermal conductivity, effectively reduce thermal noise, improve a signal-to-noise ratio, and can effectively control a thermal load of the cold finger, so that the detector can stably work at a lower temperature and the performance of the detector is improved. The method adopts electron beam and laser welding, can greatly reduce a leakage rate, and adopts a non-evaporable getter to adsorb residual gas, can improve vacuum maintenance time in the infrared detector, and improve product quality. The method realizes breakthroughs of the infrared detector Dewar in sensitivity, stability, service life and the like through optimization of a whole chain of materials, processes and detection, and is especially suitable for high-precision military and space infrared systems.

Thermal energy transmission from a cryocooler cold finger is enhanced by means of a high thermal conductivity material used for or placed adjacent the cold finger end cap. In addition, the actual or effective surface area contacted by the working gas proximate the endcap is increased, thereby increasing the convective heat transfer coefficient. These features permit the coolest gas expansion space in the cold finger to be provided within the highly thermally conductive end cap, unlike many conventional designs in which the cold finger of low thermally conductive metal forms the expansion space side walls and the endcap forms only the axially facing outer surface in contact with the cooled equipment. Having the expansion space built into the high thermally conductive end cap reduces the temperature drop between the load to be cooled and the gas (e.g., helium), thus increasing the thermodynamic cycle efficiency.

A cryogenic cooling system comprising a cold finger for cooling of a transducer is preintegrated with a dewar, so that final implementation can be executed by simply adding a compressor connection and buffer inertance assembly. The transducer may be a detector such as an optical detector, and may be permanently integrated with the cold end of the cold fingen Figure 3

This disclosure relates a device for a chromatographic system, comprising: a chamber defining an internal portion, a capillary disposed within the chamber, the capillary having an input, an output, and an elongate body extending between the input and the output, a cold finger having a first portion in thermal contact with a portion of the elongate body to define a capillary trapping zone, wherein the first portion of the cold finger extends to a second portion that is situated external to the chamber, a heater in thermal contact with the trapping zone of the capillary and configured to transfer heat to the trapping zone, a thermal buffer configured to buffer the heat from the heater into the cold finger and thereby retain the heat within the trapping zone of the capillary, a cooling device arranged external to the chamber and thermally connected to the second portion of the cold finger to define a primary conduction zone, wherein the cooling device is configured to generate a cooling temperature zone at the primary conduction zone, a controller configured to selectively alternate the trapping zone between a cooling temperature by turning off the heat and using the cooling device together with its engagement with the cold finger, and an injection temperature using the heater, wherein the heater alternates between an off state and an on state and a user defined frequency.

The invention provides a liquid nitrogen generating device with a low-temperature condensation Dewar inner container structure and a method, and relates to the technical field of freezing equipment.The liquid nitrogen generating device comprises a vacuum heat insulation shell, a refrigerating machine, a Dewar inner container, a gas inlet assembly and a liquid outlet assembly, and the Dewar inner container is arranged in the vacuum heat insulation shell; a vacuum heat insulation cavity is formed between the vacuum heat insulation shell and the Dewar inner container, the refrigerator is provided with a cold finger structure, the cold finger structure is fixedly connected with the top of the Dewar inner container through a heat conduction connecting structure, the air outlet end of the air inlet assembly is communicated with an inner cavity of the Dewar inner container, and the liquid inlet end of the liquid outlet assembly is communicated with the bottom of the Dewar inner container. The Dewar liner can be directly cooled through the cold finger structure of the refrigerator, so that the cold loss caused by repeated vaporization of liquid nitrogen is effectively reduced, and the cold utilization efficiency is improved; meanwhile, due to the fact that the low-temperature surface area is remarkably increased, nitrogen can be condensed on the low-temperature surface with a larger area, the heat exchange efficiency of the nitrogen is improved, and the liquid nitrogen generation rate and the liquid preparation capacity are improved.

A cryocooler is disclosed. The cryocooler may include a magnetic spring, a regenerator / displacer, a working fluid, and a cold finger configured to contain the working fluid in a closed system, and to contain the regenerator / displacer that is configured to travel linearly within the cold finger. The magnetic spring may provide a force to cause the regenerator / displacer to return to a center position during thermal cycle operation of the cryocooler. Additional systems and related methods are also provided.

The application discloses a room-temperature piston type Stirling pulse tube refrigerator and relates to the field of low-temperature refrigeration, comprising a compressor, a separate pipe, a connecting pipe and a pulse tube cold finger; the compressor comprises a center connecting structure, two groups of compressor heat exchangers oppositely distributed on the two sides of the center connecting structure, a linear compression mechanism, a driving motor and an elastic supporting mechanism; the compressor is connected with the pulse tube cold finger through the separate pipe and the connecting pipe respectively. The application has the advantages that the room-temperature piston work recovery technology is adopted to recover the pulse tube heat end expansion work, the overall machine efficiency is improved, the phase of the mass flow and the pressure of the working medium can be adjusted, the optimal matching of the compressor and the pulse tube cold finger is realized, the high-efficiency operation of the overall machine is realized, and the overall machine refrigeration efficiency is improved.

The application provides a low-temperature ion trap fluorescence collection system and an assembling method thereof, and relates to the technical field of quantum computing and quantum communication.The low-temperature ion trap fluorescence collection system comprises: a thermostat cooled to a target temperature by an external refrigerator; a cold finger arranged in the thermostat; and a low-temperature ion trap wrapped around the cold finger in the thermostat. The low-temperature ion trap wrap comprises: a main body for trapping ions under the excitation of an external voltage and manipulating the quantum state of the ions under the irradiation of a plurality of laser beams incident from the outside, and the ions emit fluorescence under the excitation of the plurality of laser beams; and a fluorescence collection mechanism for collecting the fluorescence. A continuous gas flow channel is formed between the fluorescence collection mechanism and the main body to discharge the gas in the main body in the process of forming a vacuum environment in the thermostat, and the low-temperature ion trap wrap has a vacuum environment therein and is at the target temperature, so that the residual gas is adsorbed, thereby inhibiting the backflow of the residual gas into the main body and colliding with the ions.

The invention relates to the technical field of low-temperature liquefied gas storage, and provides a liquefied gas storage system which comprises a liquefied gas storage tank and a pulse pipe refrigerating device arranged on a gas outlet pipe of the tank body. The pulse tube refrigerating device comprises a condenser and a pulse tube refrigerating machine; the condenser comprises at least one condensation monomer, and the condensation monomer is made of a metal material with the heat conductivity coefficient larger than 200. A first connecting part is arranged in the center of the first side face of the condensation piece, a second connecting part is arranged in the center of the second side face, and the first connecting part and the second connecting part can be fixedly installed in a matched mode. Flow guide holes are formed in the condensation sheets; and a cold finger of the pulse tube refrigerator is connected with a first connecting part of a first condensing monomer of the condenser. According to the liquefied gas storage system provided by the invention, the pulse tube refrigeration device is smaller in overall structure occupied space and simpler in structure, and the condensation monomers of the condenser can be detached and replaced, so that installation and maintenance are simpler. And gas does not need to be discharged, so that zero discharge and full recycling are realized.

The general condensation module and self-supply system comprises a self-pressurization liquid nitrogen tank and a cold trap, the self-pressurization liquid nitrogen tank is connected with the cold trap, and the cold trap is connected with an ion source cavity through a cold finger. A liquid nitrogen tank butt joint cylinder is installed on the top of the self-pressurization liquid nitrogen tank, connected with a liquid nitrogen input pipe through a liquid nitrogen special solenoid valve and connected with a cold trap through the liquid nitrogen input pipe. According to the application, the problems of serious pollution, insufficient vacuum degree, obvious memory effect, difficulty in maintenance, poor adaptability and the like in the prior art are solved through the cold trap combined by the general condensation module and different detachable cold fingers, the liquid nitrogen self-supply system, the pre-refrigeration, the double-liquid-level alarm, the remote monitoring and the adaptive design of various instruments; and high-efficiency, energy-saving and unattended high-quality condensation trapping is realized.

The present invention is directed to a cryogenic cooler that may include a cold finger coupled to a cooling source, an insulating vessel having an inner wall, an outer wall and an interior area formed within the inner wall, where the cold finger may be positioned at least partially within the interior area. The cryogenic cooler may also have a fitting positioned on the outer wall and configured for coupling to a gas source, and a passageway formed between the coupling and the inner wall and configured to allow the transfer of a gas from the gas source to the interior area. The cryogenic cooler may also have an opening is formed in the interior area so as to allow the transfer of the gas around the cold finger and out of the interior area.

The application discloses an integrated coaxial pulse tube refrigerator and belongs to the technical field of pulse tube refrigerators, comprising a refrigerator cold finger, a driving mechanism and a piston phase modulation mechanism; the refrigerator cold finger comprises a pulse tube, a regenerator, a cold end heat exchanger and a hot end heat exchanger; the driving mechanism comprises a mounting shell, a driving cylinder body, a driving component and a driving piston body coaxial with the pulse tube, the driving piston body separates a piston cavity into a working chamber and a back pressure chamber, and the working chamber is communicated with the hot end of the regenerator through a gas inlet pipeline; the piston phase modulation mechanism comprises a phase modulation cylinder body, an elastic support component and a phase modulation piston body coaxial with the driving piston body, the phase modulation piston body separates a phase modulation cavity into an expansion chamber and a recovery chamber, the expansion chamber is communicated with the open end of the pulse tube through a phase modulation pipeline, and the recovery chamber is communicated with the back pressure chamber. The coaxial arrangement of the mechanisms is simple and compact, the loss of the connecting pipeline is small, the integration, compactness and high efficiency of the refrigerator are realized, and the application is the innovation target of the low-temperature refrigerator.

The invention relates to an infrared radiation detector (10a) comprising: – a cryostat (11) equipped with a cold finger (12) and a window (13) transparent to the infrared radiation to be detected; – a cold plate (14) mechanically fixed and in heat exchange with the cold finger (12); – a detection block (15) in heat exchange directly or indirectly with the cold plate (14); and – a cold screen or diaphragm (16), mechanically fixed and in heat exchange with the cold plate (14), and suitable for limiting stray radiation; the cryostat (11) incorporating at least one zeolite material (17a-17d) having a pore opening of between 5 and 8 Ångströms, configured to maintain a vacuum of less than 10-2 mbar in the cryostat (11) continuously throughout the lifetime of the infrared radiation detector (10a), even when the cold finger (12) is not cooled. Figure for the summary: Fig 2

The application relates to an ultra-low-temperature refrigeration system and a refrigeration method thereof, which comprises a Stirling refrigeration unit and an adiabatic demagnetization refrigeration unit coupled with the Stirling refrigeration unit; the Stirling refrigeration unit comprises a pulse tube cold finger unit connected with the adiabatic demagnetization refrigeration unit and a pulse tube compressor unit connected with the pulse tube cold finger unit, wherein the pulse tube compressor unit is used for driving the pulse tube cold finger unit to refrigerate, the pulse tube cold finger unit is used for refrigerating to provide pre-cooling refrigeration capacity for the adiabatic demagnetization refrigeration unit, and the adiabatic demagnetization refrigeration unit is used for realizing refrigeration based on a magnetocaloric effect; the ultra-low-temperature refrigeration system directly combines a long-life Stirling type architecture with the adiabatic demagnetization refrigeration, fully utilizes the advantages of the Stirling type refrigeration machine and the adiabatic demagnetization refrigeration system, can greatly reduce the complexity of space ultra-low-temperature technology, and further improves the efficiency of the whole system.

The invention discloses a temperature control method and system for a linear Stirling cryocooler, and relates to the technical field of cryocooler temperature control, and the method comprises the steps: synchronously collecting key operation data of a target cryocooler in real time, carrying out the preprocessing, and constructing a state vector at each sampling moment; calculating a terminal response sensitivity index at the current sampling moment based on the corresponding state vector; calculating an environment-refrigeration coupling characteristic index at the current sampling moment based on the corresponding state vector and the terminal response sensitivity index; calculating a terminal precision risk index at the current sampling moment based on the corresponding state vector; based on the three indexes, a sliding mode control parameter corresponding to the next sampling moment is adjusted in a self-adaptive mode; and generating a control quantity corresponding to the next sampling moment based on the sliding mode control parameter, and driving the target refrigerator to adjust the refrigeration power. The method can maintain the accuracy and stability of the cold finger temperature under complex dynamic conditions.

The invention discloses a low-vibration active phase modulation composite pulse tube Stirling refrigerator, and belongs to the technical field of low-temperature refrigerators. The composite refrigerator cold finger integrates a first-stage Stirling assembly serving as a high-temperature stage and a second-stage pulse tube assembly serving as a low-temperature stage. The system is characterized in that a phase modulation unit of the second-stage pulse tube assembly is formed by winding and fixing a second-stage inertia tube on the inner circle of the gas reservoir, the whole gas reservoir is fixedly connected to the first-stage cold end heat exchanger, and the system efficiency is improved through low-temperature arrangement. Meanwhile, a compressor displacement sensor and a cold finger displacement sensor are used for monitoring in real time and cooperatively controlling the motion state of a compressor piston and a first-stage discharger, and active and accurate phase modulation is achieved; and reverse compensation is carried out according to the motion feedback of the first-stage discharger by utilizing the active shock absorber, so that the vibration output of the whole machine is remarkably counteracted. The method realizes the unification of high efficiency, low vibration and high reliability, and is particularly suitable for application scenes such as space detection sensitive to vibration.