107 results about "Cold finger" patented technology

In one aspect, a specimen holder includes a first end configured to attach to a cooling device and a second end configured to be inserted into a microscope; a section with a sample tip at the second end; an interface between the first end configured to attach to the cooling device and the section with the sample tip; and an internal thermal connection section configured to be in thermal contact with a cold finger of the cooling device when the specimen holder is attached to the cooling device and extending through the section with the sample tip to the sample tip.

The disclosure describes various aspects of a vibrationally isolated cryogenic shield for local high-quality vacuum. More specifically, the disclosure describes a cryogenic vacuum system replicated in a small volume in a mostly room temperature ultra-high vacuum (UHV) system by capping the volume with a suspended cryogenic cold finger coated with a high surface area sorption material to produce a localized extreme high vacuum (XHV) or near-XHV region. The system is designed to ensure that all paths from outgassing materials to the control volume, including multiple bounce paths off other warm surfaces, require at least one bounce off of the high surface area sorption material on the cold finger. The outgassing materials can therefore be pumped before reaching the control volume. To minimize vibrations, the cold finger is only loosely, mechanically connected to the rest of the chamber, and the isolated along with the cryogenic system via soft vacuum bellows.

The invention relates to the technical field of detector testing, and discloses a multi-parameter testing system and method for thermal characteristics of a refrigeration type infrared detector, and the system comprises a cooperative measurement module, a coupling analysis module, an optimization testing module, and a data analysis platform. The method corresponds to the system. According to the application, the temperature field, stress distribution and local heat flow data of the to-be-tested detector can be synchronously acquired, and the sensor is calibrated in a low-temperature vacuum environment, so that data drift in an extreme environment is avoided, and the accuracy of actually measured data is ensured; a coupling simulation model is built based on a heat conduction equation, a reduced order model and a Maxwell model, parameters are corrected by means of measured data, and thermal load, thermal mismatch stress and refrigeration efficiency evaluation results are accurately output; the cold screen coating performance and the cold finger thermophysical property of the detector can be tested, and the special test blank of key components is filled up; and multi-source data is integrated to identify anomalies, a three-dimensional thermal field interface is output, the optimization design is assisted, and the test comprehensiveness and accuracy are integrally improved.

The invention provides a variable temperature testing device for chip testing and a chip processing system, and relates to the technical field of chip detection. Comprising an intermediate measurement Dewar assembly, a fixing assembly and a refrigeration assembly. The intermediate measurement Dewar assembly comprises a thin-wall cold finger, a transition ring, a Dewar base and a Dewar window seat; the fixing assembly comprises a bottom plate; the connecting piece is arranged on the bottom plate, and a first height is formed between the connecting piece and the bottom plate; the supporting piece is arranged on the bottom plate, and a second height is formed between the supporting piece and the bottom plate; one end of the supporting piece is connected with the bottom plate, and the other end is in supporting connection with the Dewar window seat; the refrigerating assembly comprises a refrigerating machine which is arranged on the bottom plate and is in communication connection with an external control device; one end of the expansion machine is connected with the refrigerating machine, and the other end of the expansion machine is detachably connected with the other end of the thin-wall cold finger through a connecting piece; the refrigerator determines a refrigeration temperature of the expander. The variable temperature testing device provided by the invention has the characteristics of high temperature adjustment response rate, large adjustable temperature range and high temperature control precision.

The utility model provides a liquid nitrogen recondensation cooling system of a high-purity germanium spectrometer, which comprises a liquid nitrogen tank and a refrigerating machine, the liquid nitrogen tank is provided with a refrigerating machine mounting hole and a detector mounting hole, the periphery of the refrigerating machine mounting hole is provided with an annular groove, the annular groove is provided with an annular elastic sealing gasket, a sealing plate is fixed above the refrigerating machine mounting hole, and the sealing plate is fixed above the detector mounting hole. The sealing plate is tightly pressed on the annular elastic sealing gasket and is in tight contact with the annular elastic sealing gasket for sealing; an opening coaxial with the refrigerator mounting hole is formed in the sealing plate, an annular elastic sealing sleeve is connected to the inner wall, located at the opening, of the sealing plate, a cold finger of the refrigerator vertically penetrates through the annular elastic sealing sleeve and extends into the liquid nitrogen tank, and the cold finger of the refrigerator is in interference fit with the annular elastic sealing sleeve. According to the liquid nitrogen recondensation cooling system, the joints of the cold finger of the refrigerating machine and the cold finger of the detector and the liquid nitrogen tank are effectively sealed, and meanwhile vibration of the refrigerating machine and the cooling fan is effectively reduced through the damping piece.

A microscopic cryostat comprises a supporting base, a vacuum shell, a vacuum shell top cover, a cold shield, a cold shield top cover, a cold shield support, a sample holder support, a sample holder, an extension cold finger, a sample seat, a window and pipe legs. The thermostat sequentially comprises a vacuum shell, a cold screen support, a cold screen, a sample holder support and a sample holder from outside to inside, the vacuum shell is mounted on a supporting base, and pipe legs are mounted on the side wall of the vacuum shell. According to the utility model, a heat insulation supporting structure and a damping design are adopted, the vibration level is at the nanoscale, the coaxial inlet and outlet pipeline design can work in any direction and is matched with most commercial microscopes and spectrometers for use, and the device has the characteristics of high cooling speed, large temperature change range and good temperature stability.

A wearable garment, such as a vest, for providing thermal conditioning, for example cooling and / or heating, to a user. The vest may be used with cryogenic temperatures. Peltier devices, pre-charged nitrogen canisters, or miniature Stirling cryocoolers may be mounted and built into the wearable or externally carried or mounted thereto. A pump, such as a vacuum diaphragm pump, causes thermally conditioned air to flow through a series of porous regenerative tubing and / or porous panels to supply conditioned air to a user of the garment. The system may use a cryocooler having a pulsating cold finger. The cryo embodiments may supply −200° C. gas through the panels or tubing. Portable systems can be carried or attached, such as HVAC, refrigeration, heating or the like. Control systems may regulate the temperature and may be adjusted by a user, for example using an input pad or a mobile device.

The invention relates to a high-reliability refrigerating machine micro-vibration suppression system for space. The high-reliability refrigerating machine micro-vibration suppression system comprises a detector, a cold plate, a flexible cold chain, a supporting column, a refrigerating machine cold finger, a cabin plate, a mounting base plate, a coupling flange, a cold head, a connecting pipe, a dynamic vibration absorber, a compressor, a cold box, a vacuum cavity, an outer corrugated pipe, a vacuum pump suction pipe and a vacuum pump. According to the high-reliability refrigerating machine micro-vibration suppression system for the space, the dynamic vibration absorber is adopted for absorbing vibration of the cold head of the refrigerating machine while effective supporting of the transmitting section and micro-vibration isolation in the on-orbit period are achieved, micro-vibration of the refrigerating machine is further suppressed and isolated, and the refrigerating efficiency is improved. The device has the advantages of high reliability, simple structure, low cost and thorough micro-vibration suppression; vibration isolation is achieved through the environment difference between the space and the ground, operation is not needed after in-orbit operation, automatic unlocking is achieved, and surrounding structures and loads are friendly and free of damage.

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.

The present invention discloses a dual-band detector common dewar structure, the dewar includes a window, an upper cavity, a cold shield, a spectroscope, a spectroscope frame, fixing screws, a band one module, a band two module, a flexible cable, a connector, a cold platform, a lower cavity, a column shell and a cold finger. Two detector modules are respectively installed on the cold platform, the spectroscope is glued to the spectroscope frame, the frame after gluing is fixed on the cold platform by screws, and the cold shield is connected to the cold platform; the window is airtightly connected to the upper cavity, the lower cavity is airtightly connected to the column shell and the cold finger, the upper and lower cavities form a vacuum dewar, and the electrical signal is led out through a flexible cable connected to the detector. In this structure, the spectroscope is installed in the dewar, which greatly reduces its own radiation and improves the imaging effect of the detector. The structure is compact and low in cost, and is suitable for the compact integration of low-background dual-band large-scale focal plane detectors.

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 present invention discloses an integrated pulse tube refrigerator, which relates to the technical field of pulse tube refrigerators. The refrigerator comprises a cold finger, a piston-type phase-adjusting mechanism, two main drive mechanisms, and a gas connection mechanism. By arranging the two main drive mechanisms and the piston-type phase-adjusting mechanism coaxially, with the cold finger arranged perpendicularly thereto, the entire device is simple and compact, with minimal loss in the connecting pipes. This achieves the goals of refrigerator integration, compactness, and high efficiency, and facilitates coupling with cooled devices. Furthermore, the use of the piston-type phase-adjusting mechanism for phase adjustment offers a wide phase adjustment range, a compact structure, and precise phase adjustment angles, contributing to high efficiency of the pulse tube refrigerator.

The utility model discloses a detector assembly which comprises a cold finger, a substrate, a first focal plane, a second focal plane, a spectroscope and a reflector. The substrate is arranged at one end of the cold finger; the first focal plane and the second focal plane are both arranged on the side, away from the cold finger, of the substrate. The spectroscope is used for dividing incident infrared light into infrared light of a first wave band and infrared light of a second wave band and making the infrared light of the first wave band enter the first focal plane. And the reflector is arranged at the downstream of the spectroscope along the transmission direction of the infrared light of the second wave band, and is used for receiving and reflecting the infrared light of the second wave band to the second focal plane. According to the detector assembly, the first focal plane and the second focal plane are both arranged on the substrate, and refrigeration is carried out through the cold finger, so that compared with an existing double-cold-finger structure, the detector assembly is additionally provided with the reflecting mirror to enable infrared light of the second wave band to enter the second focal plane on the substrate, the structure is simpler, and the size and the weight are smaller. The utility model also discloses an infrared device.

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.

The Dewar comprises a Dewar outer shell and a cold head structure arranged in the Dewar outer shell, the cold head structure comprises a cold finger air cylinder, a cold table, a base plate and a balance cushion block, the cold table is connected to the cold finger air cylinder, a first connecting face of the balance cushion block is fixedly connected with the cold table, and a second connecting face of the balance cushion block is fixedly connected with the base plate. The base plate is fixedly connected to the second connecting face of the balance cushion block, an assembling groove is formed in the first connecting face in a sunken mode, and the cold table is fixedly embedded in the assembling groove. According to the utility model, the first connecting surface of the balance cushion block is provided with the assembling groove, and the assembling groove is nested and matched with the cold table, so that the connection stability and reliability between the balance cushion block and the cold table can be improved, the risk that the balance cushion block falls off from the cold table is greatly reduced, and the impact vibration resistance of the Dewar and the infrared detector is remarkably improved; therefore, the infrared detector can meet the working requirements in a harsh environment.

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 application provides a space refrigeration equipment vibration composite control system and method, comprising: a passive vibration isolation module and an actuation module; the passive vibration isolation module performs preliminary attenuation on the vibration of a compressor in the space refrigeration equipment in a passive vibration isolation mode, reduces the transmission of the vibration of the compressor from a base plate to a cold finger end detector; the actuation module performs attenuation on residual vibration transmitted from the compressor to the cold finger end through a connecting pipe in an active vibration suppression mode, so as to suppress the micro-vibration of the gas in the connecting pipe from the compressor to the cold finger end caused by uneven flow; and performs attenuation on residual vibration transmitted from the compressor to the cold finger end through the base plate in an active vibration suppression mode. The application is suitable for guaranteeing that the space vehicle load refrigeration equipment outputs minimal disturbance, and avoiding affecting the resolution and stability of the load.

The present application provides a refrigerator including a housing, a discharge device, a cold finger device, and at least two compression devices. A disassembly and assembly hole is provided on the housing located between the at least two third accommodating cavities arranged at intervals, and the disassembly and assembly hole is communicated with the first accommodating cavity and is configured for the disassembly and assembly of the discharge device. By arranging the disassembly and assembly hole, the discharge device may be removed without disassembling the compression device, which simplifying disassembly and assembly steps of the discharge device and meeting the need of rapid testing of the compression device. By arranging the discharge device with a stepped piston, the requirement for a leaf spring having high stiffness and large amplitude may be reduced, the friction force between the stepped piston and the discharge cylinder is decreased and thus the service life of the discharge device is increased; meanwhile, compared with a discharge device that shares the same area, the discharge device with stepped piston has higher reliability and consistency. By arranging a tree topology or net topology, the flow resistance of gas may be reduced and the refrigeration efficiency may be improved; at the same time, the refrigerator has a compact structure, which is conducive to achieving multi-stage refrigeration.

The expander assembly of the Stirling cryocooler comprises a cold finger provided with a cold finger air cylinder, a cold finger air cylinder, a cold finger air cylinder and an expander assembly, a shell of the regenerator is in clearance fit with the cold finger air cylinder; the base is connected with the cold finger, and a gas flowing cavity is formed in the base; the spring is respectively connected with the base and the regenerator shell; the expansion machine assembly further comprises a lining connected with the outer wall face of the regenerator shell. The hot end air cylinder is connected and matched with the cold finger air cylinder in a sleeved mode and connected with the inner wall face of the cold finger air cylinder, the hot end air cylinder is arranged outside the lining in a sleeved mode, and the hot end air cylinder and the lining are in clearance seal. According to the application, only the dynamic gap of the hot end cylinder and the lining needs to be sealed, and the gap between the whole regenerator shell and the whole cold finger cylinder does not need to meet the gap sealing requirement, so that the sealing length can be greatly reduced, and meanwhile, the universality between the cold finger cylinder and the regenerator is not influenced.

The utility model belongs to the technical field of throttling refrigerators, and particularly provides a long cold accumulation throttling refrigerator and an infrared detector, the long cold accumulation throttling refrigerator comprises a cold finger cylinder and a bottom flange; the cold finger cylinder is mounted on the bottom flange; the bottom flange is provided with a plurality of fixing parts used for being fixed to a cold finger air cylinder. The area, located between every two adjacent fixing parts, of the bottom flange is a backflow outlet area. A part of the backflow outlet area is provided with a backflow outlet communicating the interior of the cold finger air cylinder with the outside. The backflow outlets for communicating the interior of the cold finger air cylinder with the outside are only formed in part of the backflow outlet areas, the size of the total cross section of the backflow outlets is changed, and existing backflow outlets formed in all the backflow outlet areas are changed into backflow outlets formed in part of the backflow outlet areas and communicated with the outside atmosphere. According to the structure that part of the backflow outlet area makes contact with the plane of the cold finger air cylinder, the size of the gap between the cold finger air cylinder and the bottom flange is changed, the aim of prolonging the residence time of backflow gas is achieved on the premise that the cooling time is not affected, and the cold storage capacity of the refrigerator is improved.

A scientific instrument, for example an electron microscope, is disclosed and comprises a moveable stage with a sample holder. A cold finger is in contact with a heat sink and comprises a cooling plate configured to contact the sample holder to cool the sample holder in a rapid cooling position. A thermally conductive flexible member thermally connects the sample holder and the cold finger to cool the sample holder away from the rapid cooling position, where the sample can be investigated, imaged, and the like. Embodiments are disclosed in which both the cold and the sample holder move or in which only the cold finger move between a rapid cooling and other configurations. Also disclosed is a corresponding method for operating the scientific instrument. The disclosure advantageously combines rapid cooling in the rapid cooling position with reduced limitation of movement of the sample holder away from the parked position.

This infrared radiation detector comprises: - a cryostat provided with a cold finger, capable of ensuring heat exchange with a cold source, and a window transparent to the infrared radiation to be detected; - a cold plane, mechanically fixed to and in a heat exchange relationship with the cold finger; - a detection block comprising at least one detection matrix sensitive to the infrared wavelength range to be detected, and in a heat exchange relationship directly or indirectly with the cold plane; - a cold shield mechanically fixed to and in a heat exchange relationship with the cold plane and capable of limiting parasitic radiation, the cold shield being provided with at least one diaphragm or baffle (9), oriented radially with respect to the overall orientation of the detector, and provided with an opening capable of allowing the transit of the optical path resulting from the incident radiation. The free edge (13) of the at least one diaphragm or baffle (9) is structured such that non-linear patterns (14) are defined.

The invention discloses a regenerative refrigerating machine system and method for achieving remote cooling by leading out cold end direct current. The regenerative refrigerating machine system comprises a regenerative refrigerating module, a remote throttling refrigerating module and a direct current loop module. The regenerative refrigeration module comprises a refrigerator compression device, a cold finger and a radiation screen which are connected in sequence; the remote throttling refrigeration module comprises a remote pipeline and a throttling heat exchanger, and high-voltage direct-current gas led out of the cold-end heat exchanger flows to a throttling element in the throttling heat exchanger through the remote pipeline and is in direct contact with an object to be cooled for heat exchange; the direct-current loop module comprises a direct-current pipeline, a part of the direct-current pipeline is in direct contact with the radiation screen and the cold finger, the radiation screen and the cold finger are cooled back through direct-current cooling capacity, the flow is controlled through the direct-current control assembly, and finally direct current directly returns to a high-pressure pipeline of the refrigerating machine compression device to complete external circulation. On the basis that the original refrigerating performance of the refrigerating machine is not reduced, the direct current is led out from the cold end, and remote cooling is achieved.

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 Dewar shell structure comprises a Dewar cold finger, a flange used for being coupled with a refrigerator is arranged at the lower end of the Dewar cold finger, a Dewar shell is welded to the interior of the upper end of the Dewar cold finger, and the outer surface of the Dewar shell and the outer surface of the Dewar cold finger are both provided with stripe-shaped protrusions. The outer part of the upper end of the Dewar cold finger is welded with the Dewar light window; in order to ensure the temperature controllability of the window seat part, the Dewar shell structure is optimized, on one hand, the heat dissipation area of the Dewar shell structure is increased through turning or carving to enhance the heat dissipation capacity of the Dewar shell, and on the other hand, the heat conduction heat flux is reduced by increasing the solid heat transfer distance from the Dewar top window seat to the assembly hot end; and the temperature rise of the shell and the top detection window seat of the Dewar can be effectively controlled.

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 discloses a passive piston phase modulation type GM pulse tube refrigerator which comprises a passive phase modulation mechanism, a compressor, a cold finger assembly and a phase modulation connecting pipe, the passive phase modulation mechanism is connected to the cold finger assembly through the phase modulation connecting pipe, and the cold finger assembly is connected to the compressor through a helium pipe. The passive phase modulation mechanism comprises an air cylinder, a column spring, a spring seat and a phase modulation piston located in the air cylinder. The phase modulation piston reciprocates under the action of alternating airflow at the hot end of the pulse tube, the stroke of the phase modulation piston is controlled by adjusting parameters such as spring rigidity, the mass and the diameter of the phase modulation piston, passive phase modulation is achieved, and therefore the pulse tube hot end mass flow and pressure wave phase angle is adjusted, and the optimal phase angle of the pulse tube hot end mass flow and pressure wave is obtained through comparison. An optimal passive phase modulation function is realized, and high efficiency of the whole machine is realized; and a passive phase modulation mechanism is adopted, the acoustic power of the hot end of the pulse tube can be recycled while passive phase modulation is conducted, the overall efficiency is further improved, and therefore the GM pulse tube refrigerator with high reliability and high refrigeration efficiency is achieved.