56results about "Cold traps/baffles" patented technology

The invention provides a polymer devolatilization process and a devolatilization system. The devolatilization process comprises the following steps: heating a polymer raw material containing volatile components to obtain a molten polymer, pressurizing the molten polymer, mixing with an entrainer, and feeding into a falling film device; after sudden pressure drop and heating, the entrainer carries volatile components to be separated from the system, and a devolatilization product is obtained; the mass ratio of the polymer raw material to the entrainer is (10: 1)-(10000: 1). According to the polymer devolatilization process provided by the invention, the entrainer with a low boiling point is introduced into a reaction system, a large number of microbubbles are formed through vaporization of the entrainer and azeotropy of volatile components, removal of the volatile components in the material is enhanced through pressure swing flash evaporation, and extremely low pressure does not need to be reached in a devolatilization device.

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 present invention provides a trifluoromethyl fluoroformate synthesis system and method. The trifluoromethyl fluoroformate synthesis system comprises a reaction unit, a heat exchange unit, a cold trap unit, a low-temperature rectification unit, and a recycling unit that are arranged in sequence. The reaction unit comprises a feed pipe, a discharge pipe, and a reactor. The discharge pipe is communicated with the cold trap unit by means of a third heat exchange tube, the cold trap unit is communicated with the low-temperature rectification unit, and the low-temperature rectification unit is communicated with the recycling unit. The heat exchange unit comprises a heat exchanger. The low-temperature rectification unit comprises a rectifying section and a stripping section. The recycling unit comprises a first circulating pipe and a second circulating pipe that are used for recycling a product from the rectifying section, wherein the first circulating pipe and the second circulating pipe are respectively communicated with the feed pipe by means of a second heat exchange tube and a first heat exchange tube, and the first heat exchange tube, the second heat exchange tube, and the third heat exchange tube all pass through the heat exchanger. By recycling the product from the rectifying section, the present invention reduces the loss of raw materials, and improves the product yield.

The present application relates to the technical field of cold trap, and particularly relates to a high-efficiency diffusion pump cold trap, which comprises a cold trap shell, the cold trap shell comprises a cold trap shell body and a cold trap cover body; further comprising a condensing assembly, the condensing assembly comprises a cylindrical main condensing cavity, a plurality of sub-condensing cavities and a coil condensing pipe; the inside of the main condensing cavity forms a main condensing cavity; one end of the sub-condensing cavity extends into the main condensing cavity along the radial direction of the main condensing cavity to form a condensing connecting part, and the other end of the sub-condensing cavity extends out of the condensing diffusion part along the radial direction of the main condensing cavity; the inside of the sub-condensing cavity forms a sub-condensing cavity; the plurality of sub-condensing cavities are respectively communicated with the main condensing cavity; the coil condensing pipe is in contact with the inner wall of the main condensing cavity; and the coil condensing pipe is also respectively in contact with the condensing connecting parts of the plurality of sub-condensing cavities. The present application can efficiently condense the oil vapor and other gas molecules generated by the diffusion pump, and significantly improves the efficiency of the oil vapor trapping, adsorbing and condensing.

The utility model relates to the technical field of material collection and condensation, and discloses a collection cold trap. The collecting cold trap comprises a shell, a first cooling medium layer, a material collecting layer, a second cooling medium layer and a heat preservation shielding layer are defined in the shell, the material collecting layer is used for collecting materials, and the first cooling medium layer and the second cooling medium layer are used for introducing cooling media; the heat preservation shielding layer, the second cooling medium layer, the material collecting layer and the first cooling medium layer are sequentially arranged in a sleeved mode from outside to inside. In this way, the collecting cold trap can be rapidly heated and cooled within a large temperature range, and the temperature of the material collecting layer can be accurately regulated and controlled by adjusting the temperature of the two cooling medium layers.

Provided here are methods and systems for converting pyrolysis oil with silicon-based compounds to a substantially silicon-free pyrolysis oil by treatment with an inert gas. A method of treating a pyrolysis oil to remove silicon-based compounds includes supplying an inert gas stream to a storage vessel containing a pyrolysis oil with silicon-based compounds to produce a silicon- enriched inert gas stream and a desiliconized pyrolysis oil containing at least five weight percent less of the silicon-based compounds as compared to the pyrolysis oil. The method also includes supplying the silicon-enriched inert gas stream to a cryogenic unit to recover hydrocarbons or the silicon-based compounds from the silicon-enriched inert gas stream.

The invention relates to the field of preparation of organic raw materials, in particular to a method and a device for preparing neopentane. The invention provides a neopentane preparation method and device, and the preparation method comprises the following steps: adding tert-butyl magnesium chloride, methyl iodide and an anhydrous organic solvent as raw materials into a reactor under the protection of inert gas for reaction; according to the method, tert-butylmagnesium chloride and iodomethane are used as raw materials to perform chemical reaction to generate the neopentane, a catalyst cuprous iodide and a catalyst complex 1, 3-butadiene can also be added to participate in the reaction to improve the purity of the neopentane, the reaction temperature is 20-30 DEG C, the reaction conditions are mild, and the purity of the neopentane is high and can reach 60%. The problems that in the prior art, reaction conditions for preparing neopentane are harsh, the reaction cost is high, and the process is not easy to amplify are solved.

A compressed air refrigeration dryer for dehumidifying compressed air by means of a refrigerant circuit with carbon dioxide as the refrigerant, comprising at least one compressor (1), a gas cooler (3), at least one evaporator (2) configured to dehumidify compressed air passed on its secondary side at its cold surface, a refrigerant receiver (5.1, 11), an expansion valve (6) or an ejector, and a heat exchanger (8, 18) for heating the dried compressed air, which is connected downstream of the evaporator (2) at its air-side outlet, characterized in that the compressed air refrigeration dryer further comprises a control unit, at least one frequency converter connected upstream of each electrical power input of the at least one compressor (1), and a temperature sensor at a cooling water inlet of the gas cooler (3) for detecting a cooling water temperature.a temperature sensor for detecting a compressed air temperature at a compressed air inlet provided for introducing compressed air to be dehumidified into the compressed air refrigeration dryer, at least one pressure dew point sensor for detecting air humidity and a volume flow sensor for detecting a compressed air volume flow at the compressed air inlet, and at least one pressure sensor for detecting the refrigerant pressure at the compressor inlets, wherein the control unit is connected to the at least one compressor (1), the at least one frequency converter, the temperature sensors, the at least one pressure dew point sensor, the volume flow sensor and the at least one pressure sensor and is configured in such a way as tothat it can continuously read and store measured values ​​acquired by the sensors and that it can regulate the cooling capacity generated by the refrigerant circuit by controlling the at least one compressor (1) and / or the at least one frequency converter in such a way that dehumidified compressed air flowing out of the compressed air outlet of the refrigerated dryer constantly has a predetermined pressure dew point during operation of the compressed air refrigerated dryer.

The invention discloses a cold trap device and a working method and application thereof, and belongs to the technical field of refrigeration. The device comprises an air inlet pipe and a purging pump, the air inlet pipe communicates with a first air pipe, the air conveying end of the first air pipe communicates with a second heat exchanger, the air conveying end of the air inlet pipe communicates with a first heat exchanger, the first heat exchanger communicates with a third air pipe, the air conveying end of the third air pipe is connected with a first refrigeration module, the first refrigeration module further communicates with an air outlet pipe, and the air outlet pipe communicates with the first heat exchanger. The air conveying end of the air outlet pipe penetrates through the first heat exchanger, the position, close to the air conveying end, of the air outlet pipe communicates with an eighth air pipe, the eighth air pipe communicates with the second heat exchanger, the air inlet end of the eighth air pipe penetrates through the second heat exchanger, and the air inlet end of the eighth air pipe communicates with a second refrigeration module. And a sixth air pipe further communicates between the second refrigeration module and the second heat exchanger. According to the application, the two refrigeration paths provide a cold source for air, the two refrigeration paths can be switched for operation, and condensate water can be removed without shutdown.

A method and apparatus is disclosed relating to food processing and preparation in commercial kitchens. The inventive extreme vacuum cooling (EVC) technology and apparatus for food rapid cooling and food flavor infusion can work in ultra low pressure conditions with adaptive chamber pressure control to avoid liquid splash inside the food chamber. The disclosed EVC cooling and food flavor infusion apparatus has a one-unit design for handing small payloads, and a dual-module design to handle larger payloads. It can accelerate the food marinating and brining process with substantial time savings. Using the EVC apparatus, large amounts of meats, vegetables, and fruits can be prepared with various flavor infusion recipes. Plant-forward and high-volume food service kitchens can become more time and energy efficient, less labor intensive, and higher throughput food preparation operations.

The invention belongs to the technical field of tea processing equipment, particularly relates to a negative-pressure low-temperature aroma trapping and backfilling device and process, and aims to solve the problems of loss of aroma, non-uniform mixing and blockage of discharged liquid in traditional high-temperature cooking. The device is provided with a workbench, a cooking container and a liquid nitrogen cold trap; negative pressure is formed in the cooking container through the vacuum pipe, so that aroma substances are volatilized at low temperature, and are collected in the storage box after being condensed by the spiral condensing pipe; the double-shaft motor drives the closing plate I to release closing of the liquid discharging pipe, meanwhile, the closing plate II releases closing of the backfilling pipe, tea fragrance essence is injected into the liquid discharging pipe to be mixed with tea soup, and it is guaranteed that the fragrance of products is consistent; a rotating rod I drives a cam to rotate, so that an arc-shaped scraping plate scrapes tea leaves on a filter screen, and blockage is avoided; according to the device, low-temperature aroma trapping, efficient mixing and anti-blocking liquid drainage are realized, and the quality of tea soup is improved.

The present invention relates to a condensate trap device 110 and an air purification system 2, in particular for a film stretching machine 1. The condensate trap device 110 comprises at least one movably mounted condensation element 112 and at least one drive unit 114. The drive unit 114 is coupled to the condensation element 112 in such a way as to drive the condensation element. The condensation element 112 is arranged in the condensate trap device 110 so that a contaminated airflow (214) passes through and / or over it. The movably mounted condensation element 112 is configured such that contaminants carried by the airflow 214 condense on the at least one condensation element 112. By moving the condensation element 112, the condensed contaminant can be at least partially removed from the condensation element.

A cryopump comprising: a vessel comprising a frontal open area, the frontal open area comprising an inlet to the vessel; a radiation shield; a two stage refrigerator extending into the vessel, a first stage of the refrigerator being thermally coupled to the radiation shield. A first stage array is arranged within the vessel and is also thermally coupled to the first stage of the refrigerator. A cryopanel structure is coupled to a second stage of the refrigerator. The first stage array comprises a plurality of elements arranged at increasing distances from the inlet, the element closest to the inlet being between the cryopanel structure and the inlet and elements further from the inlet having a passage through a central portion. The element closest to the inlet has a smaller outer perimeter than the elements further from the inlet.

The utility model discloses an oil-gas separation radiator for a gas station and an oil depot, and relates to the technical field of oil-gas recovery, the oil-gas separation radiator for the gas station and the oil depot comprises a support frame and a cooling pipe, the cooling pipe is spiral, and the surface of the cooling pipe is fixedly connected with a support cover. The two ends of the cooling pipe fixedly penetrate through the two ends of the supporting cover correspondingly. The supporting cover is fixedly connected with the supporting frame, an auxiliary cooling assembly is arranged on the supporting cover, and the auxiliary cooling assembly comprises an air cooling component and a water cooling component; the bottom of the spiral cooling pipe is fixedly connected with an oil conveying pipe through an electromagnetic valve, the oil conveying pipe fixedly penetrates through the supporting cover, and the problems that an existing condensation structure is low in oil gas condensation efficiency, and liquid gasoline is inconvenient to recycle are solved.

The present application provides a kind of biomass pellet combustion boiler and combustion method suitable for rice and wheat straw, including feeding device, drying chamber, gas device, gas cooling device and gas treatment device;The discharge port of the feeding device is connected with one end of the drying chamber, and the other end of the drying chamber is connected with the upper part of the gas device;Gas device is connected with gas cooling device and gas treatment device respectively;Gas treatment device is connected with gas device and gas cooling device respectively;Pyrolysis gas of gas device enters gas treatment device, and the gas that has occurred in gas device enters gas cooling device after cooling and then enters gas treatment device.The present application designs and optimizes each link used in rice and wheat straw biomass boiler, improves the combustion rate of biomass pellet through two pyrolysis, and improves the purity of biomass pellet combustion through two dust removal.

The present invention provides a system and a method for performing evolved gas analysis and gas chromatography on a single sample within a single experiment. The system and the method enable the simultaneous acquisition of thermal and compositional data by splitting evolved gases from a micro-furnace into two analytical pathways. A first pathway is directed to an evolved gas analysis (EGA) tube, and a second pathway is directed to a gas chromatography (GC) column following temporary cryogenic trapping. After completion of the EGA stage, the trapped gases are released and transferred into the GC column via an internal cryo-trap, and a GC-MS analysis is performed on the same sample. Upstream and downstream splitter connections and multiple transfer lines route gases efficiently without requiring additional sample preparation.

The invention discloses a double-cavity cold trap and condensed substance absorption treatment device and an implementation method, the double-cavity cold trap and condensed substance absorption treatment device comprises a double-cavity cold trap and an absorption treatment device, in the vapor deposition process of volatile chemical substances, excessive chemical substances and by-products are connected to a cold trap inlet gate valve through a pipeline; liquid nitrogen, dry ice or ice salt bath and the like can be placed in an inner cavity of the cold trap to condense gaseous chemical substances, and an outlet gate valve of the cold trap is connected with a vacuum pump; after the reaction is finished, the cold trap inlet gate valve is connected with inert carrier gas and a gas flow meter and is used for accelerating gasification of chemical substances condensed on the inner wall of the outer cavity and taking the chemical substances out of the cavity; a cold trap outlet gate valve is connected with an absorption barrel, a pipeline is inserted below the liquid level of absorption liquid, inert carrier gas is introduced before the pipeline is inserted into the liquid level to dilute gasified chemical substances, the concentration of the chemical substances and the intensity of reaction of the absorption liquid are reduced, and safe absorption is ensured. According to the invention, a downstream vacuum system can be effectively protected, and long-term safety production can be ensured.

The application belongs to the field of non-metallic compounds, and particularly relates to a preparation method and a preparation device of mercaptan. The preparation method is prepared by reacting a sulfuric acid monoester salt RO SO2OM1 with a sulfhydryl M2SH in a solvent, wherein the sulfuric acid monoester salt is a monomethyl sulfate CH3OSO2OM1 or a monoethyl sulfate C2H5OSO2OM1, M1 and M2 are independently Na or K, and the solvent is one or a mixture of multiple of methanol, ethanol, n-propanol, isopropanol, hexafluoroisopropanol, N, N-dimethylformamide, N, N-dimethylacetamide, N-methylpyrrolidone and dimethyl sulfoxide. The application has the technical features of (1) high economic benefit, (2) high conversion rate and good selectivity, (3) simple process and mild conditions, (4) environmental friendliness and resource recycling, and (5) safety improvement.

The technology described herein provides methods and devices to manage process flows and support systems for 3D printing. The technology provides methods and devices for separating contaminants in 3D printing fluids. The technology provides methods and devices for aligning projectors with six degrees of freedom in 3D printers. The technology provides methods and devices to cause the flow of an immiscible liquid under an interface with liquid resin in a 3D printer liquid vat to be laminar, of proper height, and of appropriate flow rate to remove heat. The technology provides methods and devices to provide feedback loops for a three-dimensional printing process that uses a flow of oil under a liquid resin to control heat in the printing process.

Methods for synthesizing and processing graphene quantum dots are disclosed. In use, a first mixture is created comprising carbon, wherein the carbon is obtained from a reactor. Next, a second mixture is created comprising the first mixture and toluene. The second mixture is sonicated. Additionally, the sonicated second mixture is filtered to produce a filtrate, wherein the filtrate includes graphene quantum dots. It is recognized that reactor-derived carbonaceous materials may often be simply discarded and considered waste. Thus, the ability to extract quantum dots from such waste provides a pioneering new approach to bringing value to that which has often been overlooked or thrown out.

The passive detachable arc-shaped cold trap comprises an arc-shaped cold trap shell, environment side fins are arranged on the outer surface of one side of the arc-shaped cold trap shell, a cold trap inlet is formed in the other side of the arc-shaped cold trap shell, a vacuum valve is installed at the cold trap inlet, a fin assembly is arranged in the cold trap inlet, windows are formed in the two ends of the cold trap shell, and detachable cover plates are installed at the two ends of the cold trap shell. Detachable fins are mounted on the outer surface of the detachable cover plate; the fin assembly comprises two rows of solid fins which are fixedly arranged on the inner surface of the cold trap shell and distributed in a staggered mode, and porous fins are clamped by the vertically-adjacent solid fins. Or the fin assembly comprises an arc-shaped porous fin which is integrally formed with the detachable cover plate; the inner surface of the cold trap shell is provided with inner side fins, and the inner side fins are discontinuously distributed along the height direction of the cold trap shell, so that gaps for mounting the solid fins are reserved; and the surfaces of the cold trap shell, the detachable cover plate, the detachable fins and the environment side fins are subjected to surface blackening and sanding treatment. The device can efficiently capture rarefied water vapor, and is simple in structure and detachable.

A heating assembly (100) for a chromatography system (1000) comprises primary and auxiliary heating tubes (110H, 120H) made of an electrically conductive material, and forming at least part of an inner and outer tube, respectively. The inner and outer tubes are mechanically and electrically interconnected. The primary and auxiliary heating tubes axially overlap at least along a subsection length (L) of the inner and outer tubes for transferring auxiliary heat from the auxiliary heating tube to the primary heating tube. The heating assembly comprises a pair of electrodes (130, 131), arranged for forming an electrical path (180) running in series through the primary and auxiliary heating tubes. The auxiliary heating tube comprises an extendible section (125) such as a bellows to axially extend or shorten for compensating any difference in thermally induced contraction or expansion, respectively, between the inner and outer tubes.

The application relates to the technical field of deuterated ammonia purification, in particular to a deuterated ammonia purification and filling system and process. The system comprises a light-removing tower, a heavy-removing tower, a fine product cold trap, a filling row and a crude product cold trap, each device is connected through a specified pipeline, the light-removing tower, the heavy-removing tower and the filling row are connected with an online detection system, and some pipelines are provided with pneumatic diaphragm valves. The process takes 4N deuterated ammonia as raw material, carries out purification detection through the light-removing tower, directly fills qualified products, and re-purifies unqualified products through the heavy-removing tower; the heavy-removing tower product is filled after being qualified, and unqualified products are slowly purified; when the pressure of the equipment is higher than 0.4 MPa, the gaseous deuterated ammonia slowly enters the fine product cold trap, is vaporized after being slowly stored, and is filled, and the operation temperature and pressure range of each device are limited. The whole process flow is detected and processed through multiple stages, the purification and filling efficiency is effectively optimized, the energy consumption is reduced, the production cycle is shortened, and an efficient and energy-saving solution is provided for production units.

To provide a trap device that can suppress blockage of the exhaust path. [Solution] The trap device 10 is positioned in the middle of the exhaust path through which exhaust gas from the process chamber flows and comprises a container 11 having a gas inlet IN through which exhaust gas is supplied and a gas outlet OUT through which exhaust gas is discharged, a plurality of cooling fins 12 provided inside the container 11 having a pair of opposing trap surfaces 12a and forming a flow path 15 through which exhaust gas flows between the pair of trap surfaces 12a, and a cooling pipe 13 extending through the pair of trap surfaces 12a and through which a refrigerant that cools the plurality of cooling fins 12 flows.

The invention relates to a cold trap device capable of generating high pressure in situ, which comprises a cold trap barrel body, an air inlet pipe, an air inlet pipe vacuum valve, an air outlet pipe, an air outlet pipe vacuum valve and a pressure gauge, and is characterized in that the cold trap barrel body is arranged in a liquid nitrogen Dewar; the device can utilize a low-temperature environment created by the liquid nitrogen Dewar to form a low-temperature space capable of effectively compressing or liquefying gas in the cold trap barrel body, so that the gas entering the cold trap barrel body is compressed or converted into a liquid state, and the internal temperature of the gas gradually rises along with the slow removal of the cold trap barrel body from the liquid nitrogen environment; the previously compressed or liquefied gas begins to expand, creating a higher pressure. External impurities are not introduced, extra energy input is not needed, energy consumption is reduced, the environmental protection performance is improved, and the operation efficiency of the whole system can be remarkably improved.

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 relates to the technical field of chemical engineering, in particular to a gas-liquid phase HF comprehensive recovery system in nitrogen trifluoride preparation through electrolysis, which comprises a buffer tower, the buffer tower is provided with a buffer tower liquid inlet and a buffer tower liquid outlet, the buffer tower liquid inlet is connected with a cold trap liquid phase pollution discharge outlet and a cooler pollution discharge outlet, and the buffer tower liquid outlet is connected with a cold trap liquid phase pollution discharge outlet and a cooler pollution discharge outlet. A liquid outlet of the buffer tower is communicated with a first-stage acid tank, the first-stage acid tank is communicated with a first-stage spray absorber, the first-stage acid tank is further communicated with a finished product acid tank, the first-stage spray absorber is communicated with a second-stage spray absorber, the bottom of the second-stage spray absorber is communicated with a second-stage acid tank, and the upper part of the second-stage spray absorber is communicated with a waste gas treatment device; and the first-stage spray absorber and / or the second-stage spray absorber are / is communicated with cold trap vacuum tail gas. The invention further relates to a comprehensive recovery method for gas-phase and liquid-phase HF in nitrogen trifluoride prepared through electrolysis. The comprehensive recovery method comprises the comprehensive recovery method for the gas-phase HF and the comprehensive recovery method for the liquid-phase HF. Waste utilization is achieved, and the cost is reduced.

The utility model provides a device for waste gas cold trap processing for semiconductor chip production, including conical cylinder wind cover, cold trap, auxiliary acceleration neck, extraction fan and alkali spray tower connection, wherein: cold trap fixed mounting is in the ground right below conical cylinder wind cover, and auxiliary acceleration neck fixed mounting is in the top of conical cylinder wind cover, and this extraction fan fixed mounting is in the top of auxiliary acceleration neck, alkali spray tower connection fixed mounting is in the top of extraction fan, and is connected with the air inlet pipe of alkali spray tower, the inner wall of conical cylinder wind cover is provided with hydrogen chloride concentration detection equipment, the setting of the utility model conical cylinder wind cover and auxiliary acceleration neck can effectively extract harmful gas outward, will not scatter out gas outward, and the scattered gas can be recycled again.

The expandable dilution refrigerating machine comprises an outer shell and dilution refrigerating modules, the tops of the dilution refrigerating modules are all fixed to a cover plate, and the cover plate is detachably connected with the edge of the top of the outer shell; the dilution refrigeration module is provided with a plurality of stages of cold plates, the dilution refrigeration module in the same outer shell is fixed through the cover plate and the plurality of stages of cold plates, and an integral unit which can be integrally mounted or dismounted is integrated; in addition, the wall plates between the adjacent outer shells can be detached, the cold plates between the multiple dilution refrigeration modules are connected step by step, and the dilution refrigerators are assembled in parallel so as to meet different refrigeration requirements. According to the invention, the low-temperature part of the dilution refrigerating machine is prepared into a dilution refrigerating module which is compact in structure, higher in integration level and independent from each other; the multiple independent dilution refrigeration modules are assembled in parallel, so that a better refrigeration effect can be obtained.