CN103512258B - Pulse tube refrigerator driven by V-M-type thermocompressor in liquid helium temperature region - Google Patents

Pulse tube refrigerator driven by V-M-type thermocompressor in liquid helium temperature region Download PDF

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Publication number
CN103512258B
CN103512258B CN201210208787.1A CN201210208787A CN103512258B CN 103512258 B CN103512258 B CN 103512258B CN 201210208787 A CN201210208787 A CN 201210208787A CN 103512258 B CN103512258 B CN 103512258B
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pulse tube
heat exchanger
end heat
thermocompressor
refrigerating machine
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CN103512258A (en
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戴巍
罗二仓
周远
王晓涛
陈燕燕
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Technical Institute of Physics and Chemistry of CAS
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Technical Institute of Physics and Chemistry of CAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/10—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point with several cooling stages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
    • F25B9/145—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle pulse-tube cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2309/00—Gas cycle refrigeration machines
    • F25B2309/14—Compression machines, plants or systems characterised by the cycle used 
    • F25B2309/1408—Pulse-tube cycles with pulse tube having U-turn or L-turn type geometrical arrangements

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

A pulse tube refrigerator driven by a V-M-type thermocompressor in a liquid helium temperature region comprises a liquid nitrogen temperature region Stirling pulse tube refrigerator, the V-M thermocompressor, a low-temperature side pulse tube refrigerator and a heat bridge. A valve is installed between a low-temperature side refrigerator hot end heat exchanger and a low-temperature side refrigerator air reservoir; a valve is installed between a hot end heat exchanger outlet and a hot end heat exchanger inlet, and a phase modulation mechanism is composed of the two valves and the low-temperature side refrigerator air reservoir; the Stirling refrigerator and a thermocompressor cold end heat exchanger respectively make contact with the heat bridge, a low-temperature side refrigerator cold end heat exchanger is communicated with a low-temperature side refrigerator intermediate heat exchanger, and pre-cooling is performed on the low-temperature side refrigerator intermediate heat exchanger through the heat bridge; at the position of the thermocompressor cold end heat exchanger, a part of gas enters a thermocompressor thermal buffer tube in a pressure surge mode, the other part of gas enters the intermediate heat exchanger, and liquid helium temperature region refrigeration is obtained at a low-temperature side refrigerator heat regenerator outlet and the low-temperature side refrigerator cold end heat exchanger; the Stirling refrigerator serves as a cold source; temperature gradient between thermocompressor room temperature and the cold source generates pressure surge; the low-temperature side refrigerator is driven by pressure waves and reaches the liquid helium temperature region finally.

Description

A kind of pulse tube refrigerating machine of V-M type thermocompressor driving of liquid helium region
Technical field
The invention belongs to Cryo Refrigerator technical field, particularly a kind of pulse tube refrigerating machine adopting the V-M type thermocompressor of the liquid helium region of thermocompressor driving pulse control cold to drive.
Background technology
Along with industry develop rapidlys such as modern information technologies, space technology, superconducting electronics, infrared acquisition, Cryomedicines, especially low-temperature electronics device and cryogenic magnet applying in each field, facilitates the development of the small-sized liquid helium region refrigeration machine for direct cooler part or device.
The small-sized Cryo Refrigerator of current liquid helium region is mainly G-M refrigeration machine or G-M type pulse tube refrigerating machine, and (what the two distinguished by?).They adopt hydraulic shrinking machine to coordinate with high/low pressure cut-over valve, provide the pressure wave of low-frequency high-voltage ratio, and refrigeration side gas through overcompression and expansion thermodynamic process, thus produces refrigeration effect, and frequency is generally several hertz; Hydraulic shrinking machine need be equipped with the equipment such as oil eliminator, systems bulky, and needs to carry out periodic maintenance, and the life-span is difficult to ensure.Gas flow is through high/low pressure cut-over valve simultaneously, and produce droop loss, therefore the thermal efficiency is lower.Stirling-type refrigeration machine adopts valveless driven compressor, its operating frequency is usually at more than 30Hz, be not suitable for high frequency run due to low temperature warm area cold-storage form of bio-carrier, cause the existing stirling-type system thermal efficiency that can realize liquid helium region far below G-M type refrigeration machine.
Summary of the invention
The object of the invention is that in solution prior art, the small-sized Cryo Refrigerator of liquid helium region is bulky, efficiency is low, vibrate the defects such as large, and provides the pulse tube refrigerating machine that a kind of V-M type thermocompressor working in liquid helium region drives; It utilizes cold warm end temperature difference to produce pressure oscillation driving pulse control cold and obtains low temperature; There is the features such as compact conformation, efficiency are high, long-life.
Technical scheme of the present invention is as follows:
The pulse tube refrigerating machine of the V-M type thermocompressor driving of liquid helium region provided by the invention, it comprises: liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler, V-M type thermocompressor and low temperature side pulse tube refrigerating machine and heat bridge;
Described liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler is made up of the pressure wave generator be connected successively, the first hot end heat exchanger, the first regenerator, the first cool end heat exchanger, the first pulse tube, the first pulse tube hot end heat exchanger, inertia tube and the first air reservoir;
Described V-M type thermocompressor is made up of the drive motors be connected successively, the second hot end heat exchanger, the second regenerator, the second cool end heat exchanger, thermal buffer tube and thermal buffer tube hot end heat exchanger; Wherein said thermal buffer tube hot end heat exchanger is communicated with upper piston area space by tube connector;
Described low temperature side pulse tube refrigerating machine is made up of the Intermediate Heat Exchanger be connected successively, the 3rd regenerator, the 4th regenerator, low-temperature end cool end heat exchanger, the second pulse tube, the second pulse tube hot end heat exchanger, the first valve, the second valve and the second air reservoir;
Connecting line between described second pulse tube hot end heat exchanger and the second air reservoir is equipped with the first valve; Connecting line between described second pulse tube hot end heat exchanger outlet and the second hot end heat exchanger entrance is equipped with the second valve, and described first valve, the second valve and the second air reservoir form the first phase modulating mechanism jointly;
First cool end heat exchanger of described liquid nitrogen temperature Stirling pulse tube refrigerating machine contacts with described heat bridge respectively with the second cool end heat exchanger of described V-M type thermocompressor and is connected, and the second described cool end heat exchanger is connected with the Intermediate Heat Exchanger of low temperature side pulse tube refrigerating machine and carries out precooling by heat bridge and to the Intermediate Heat Exchanger of low temperature pulse tubes refrigeration machine; At the second cool end heat exchanger place, a part of gas pressure fluctuation enters thermal buffer tube, and another part enters Intermediate Heat Exchanger, obtains liquid helium region refrigeration at the 4th regenerator port of export and low-temperature end cool end heat exchanger.
Described low temperature side pulse tube refrigerating machine adopts two-stage pulse tube structure: connect the 3rd pulse tube, the 3rd pulse tube hot end heat exchanger and the 3rd air reservoir successively at the port of export of described 3rd regenerator, the connecting line between the 3rd air reservoir and the 3rd pulse tube hot end heat exchanger is installed the 4th valve; Connecting line between described second hot end heat exchanger outlet and the 3rd pulse tube hot end heat exchanger entrance is equipped with the 3rd valve; Described 3rd valve, the 4th valve and the 3rd air reservoir form the second phase modulating mechanism jointly.
Described first phase modulating mechanism is substituted by the first linear electric motors.
The second described phase modulating mechanism is substituted by the second linear electric motors.
Described liquid nitrogen temperature Stirling pulse tube refrigerating machine has two kinds of patterns:
The first pattern is: the U-shaped liquid nitrogen temperature Stirling pulse tube refrigerating machine that described first pulse tube and the first regenerator are placed side by side;
The second pattern is: the first pulse tube is positioned at the coaxial type liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler among the first regenerator, this first regenerator shape ringwise.
In described low temperature side pulse tube refrigerating machine, the 4th regenerator 18 adopts magnetic material as filler.
He is adopted in the Stirling Type Pulse Tube Cryocooler of described liquid nitrogen temperature 4as gas working medium; Described V-M type thermocompressor and low temperature side pulse tube refrigerating machine adopt He 3or He 4as gas working medium.
The pulse tube refrigerating machine that the V-M type thermocompressor of liquid helium region of the present invention drives has following advantage:
Relative to traditional liquid helium region refrigeration machine, the present invention utilizes V-M type thermocompressor, the shortcoming of electric drive mechanical commprssor can be overcome, the temperature difference is utilized to produce pressure oscillation, take full advantage of the advantages such as this compressor operating frequency is low, compact conformation, machine system adopts valveless oilless (oil free) compressor, and reliability is improved, and volume significantly reduces simultaneously; In addition core component is reversible Stirling cycle, system effectiveness that can be higher than traditional type refrigeration machine; Low temperature side of the present invention eliminates the moving components such as displacer in addition, and adopt structure isolation low temperature and the room temperatures such as pulse tube, reliability and life-span are largely increased, and the vibration being simultaneously delivered to cold head load reduces; The continuous operation of potential guarantee more than tens thousand of hours.
Accompanying drawing explanation
Fig. 1 is the structural representation that a kind of V-M type thermocompressor drives single-stage pulse tube refrigerating machine embodiment 1;
Fig. 2 is the structural representation that a kind of V-M type thermocompressor drives single-stage pulse tube refrigerating machine embodiment 2;
Fig. 3 is the structural representation that a kind of V-M type thermocompressor drives single-stage pulse tube refrigerating machine embodiment 3;
Fig. 4 is the structural representation that a kind of V-M type thermocompressor drives single-stage pulse tube refrigerating machine embodiment 4;
Fig. 5 is the structural representation that a kind of V-M type thermocompressor drives single-stage pulse tube refrigerating machine embodiment 5;
Fig. 6 is the structural representation that a kind of V-M type thermocompressor drives single-stage pulse tube refrigerating machine embodiment 6;
Fig. 7 is the structural representation that a kind of V-M type thermocompressor drives single-stage pulse tube refrigerating machine embodiment 7;
Fig. 8 is the structural representation that a kind of V-M type thermocompressor drives single-stage pulse tube refrigerating machine embodiment 8.
Detailed description of the invention
The present invention is further described below in conjunction with drawings and the specific embodiments.
Fig. 1 is the structural representation that V-M type thermocompressor of the present invention drives single-stage pulse tube refrigerating machine (embodiment 1); Fig. 2 V-M type of the present invention thermocompressor drives the structural representation of single-stage pulse tube refrigerating machine (embodiment 2); Fig. 3 is the structural representation that V-M type thermocompressor of the present invention drives single-stage pulse tube refrigerating machine (embodiment 3); Fig. 4 is the structural representation that V-M type thermocompressor of the present invention drives single-stage pulse tube refrigerating machine (embodiment 4); Fig. 5 is the structural representation that V-M type thermocompressor of the present invention drives single-stage pulse tube refrigerating machine (embodiment 5); Fig. 6 is the structural representation that V-M type thermocompressor of the present invention drives single-stage pulse tube refrigerating machine (embodiment 6); Fig. 7 is the structural representation that V-M type thermocompressor of the present invention drives single-stage pulse tube refrigerating machine (embodiment 7); Fig. 8 is the structural representation that of the present invention kind of V-M type thermocompressor drives single-stage pulse tube refrigerating machine (embodiment 8); As seen from the figure, the pulse tube refrigerating machine of the V-M type thermocompressor driving of liquid helium region of the present invention, it comprises: liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler, V-M type thermocompressor and low temperature side pulse tube refrigerating machine and heat bridge 15;
Described liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler is made up of pressure wave generator 1, first hot end heat exchanger 2, first regenerator 3, first cool end heat exchanger 4, first pulse tube 5, first pulse tube hot end heat exchanger 6, inertia tube 7 and the first air reservoir 8 be connected successively;
Described V-M type thermocompressor is made up of drive motors 9, second hot end heat exchanger 10, second regenerator 11, second cool end heat exchanger 12, thermal buffer tube 13 and the thermal buffer tube hot end heat exchanger 14 be connected successively; Wherein said thermal buffer tube hot end heat exchanger 14 is communicated with piston 9 upper space by tube connector;
Described low temperature side pulse tube refrigerating machine is made up of the Intermediate Heat Exchanger 16 be connected successively, the 3rd regenerator 17, the 4th regenerator 18, low-temperature end cool end heat exchanger 19, second pulse tube 20, second pulse tube hot end heat exchanger 21, first valve 22, second valve 23 and the second air reservoir 24;
Connecting line between described second pulse tube hot end heat exchanger 21 and the second air reservoir 24 is equipped with the first valve 22; Described second pulse tube hot end heat exchanger 21 exports on the connecting line between the second hot end heat exchanger 10 entrance and the second valve 23 is housed, and described first valve 22, second valve 23 and the second air reservoir 24 be composition the first phase modulating mechanism jointly;
First cool end heat exchanger 4 of described liquid nitrogen temperature Stirling pulse tube refrigerating machine contacts with described heat bridge 15 respectively with the second cool end heat exchanger 12 of described V-M type thermocompressor and is connected, and the second described cool end heat exchanger 12 is connected with the Intermediate Heat Exchanger 16 of low temperature side pulse tube refrigerating machine and carries out precooling by heat bridge 15 and to the Intermediate Heat Exchanger 16 of low temperature pulse tubes refrigeration machine; At the second cool end heat exchanger 12 place, a part of gas pressure fluctuation enters thermal buffer tube 13, and another part enters Intermediate Heat Exchanger 16, obtains liquid helium region refrigeration at the 4th regenerator 18 port of export and low-temperature end cool end heat exchanger 19.
Described low temperature side pulse tube refrigerating machine adopts two-stage pulse tube structure: connect the 3rd pulse tube 26, the 3rd pulse tube hot end heat exchanger 27 and the 3rd air reservoir 28 successively at the port of export of described 3rd regenerator 17, the connecting line between the 3rd air reservoir 28 and the 3rd pulse tube hot end heat exchanger 27 is installed the 4th valve 30; The connecting line that described second hot end heat exchanger 10 exports between the 3rd pulse tube hot end heat exchanger 27 entrance is equipped with the 3rd valve 29; Described 3rd valve 29, the 4th valve 30 and the 3rd air reservoir 28 be composition the second phase modulating mechanism jointly.
Described first phase modulating mechanism is substituted by the first linear electric motors 25.
The second described phase modulating mechanism is substituted by the second linear electric motors 31.
Described liquid nitrogen temperature Stirling pulse tube refrigerating machine has two kinds of patterns:
The first pattern is: the U-shaped liquid nitrogen temperature Stirling pulse tube refrigerating machine that described first pulse tube 5 and the first regenerator 3 are placed side by side;
The second pattern is: the first pulse tube 5 is positioned at the coaxial type liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler among the first regenerator 3, this first regenerator 3 shape ringwise.
In described low temperature side pulse tube refrigerating machine, the 4th regenerator 18 adopts magnetic material as filler.He is adopted in the Stirling Type Pulse Tube Cryocooler of described liquid nitrogen temperature 4as gas working medium; Described V-M type thermocompressor and low temperature side pulse tube refrigerating machine adopt He 3or He 4as gas working medium.
Embodiment 1
A kind of typical structure of V-M type thermocompressor driving pulse control cold as shown in Figure 1, the pulse tube refrigerating machine of the V-M type thermocompressor driving of the liquid helium region of this embodiment, it comprises: liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler, V-M type thermocompressor and low temperature side pulse tube refrigerating machine and heat bridge 15;
Liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler is made up of pressure wave generator 1, first hot end heat exchanger 2, first regenerator 3, first cool end heat exchanger 4, first pulse tube 5, first pulse tube hot end heat exchanger 6, inertia tube 7 and the first air reservoir 8 be connected successively;
V-M type thermocompressor is made up of drive motors 9, second hot end heat exchanger 10, second regenerator 11, second cool end heat exchanger 12, thermal buffer tube 13 and the thermal buffer tube hot end heat exchanger 14 be connected successively; Wherein said thermal buffer tube hot end heat exchanger 14 is communicated with piston 9 upper space by tube connector;
Low temperature side pulse tube refrigerating machine is made up of the Intermediate Heat Exchanger 16 be connected successively, the 3rd regenerator 17, the 4th regenerator 18, low-temperature end cool end heat exchanger 19, second pulse tube 20, second pulse tube hot end heat exchanger 21, first valve 22, second valve 23 and the second air reservoir 24;
Connecting line between second pulse tube hot end heat exchanger 21 and the second air reservoir 24 is equipped with the first valve 22; Second pulse tube hot end heat exchanger 21 exports on the connecting line between the second hot end heat exchanger 10 entrance and the second valve 23 is housed, and described first valve 22, second valve 23 and the second air reservoir 24 be composition the first phase modulating mechanism jointly;
First cool end heat exchanger 4 of liquid nitrogen temperature Stirling pulse tube refrigerating machine and the second cool end heat exchanger 12 of V-M type thermocompressor contact with described heat bridge 15 respectively and are connected, and the second cool end heat exchanger 12 is connected with the Intermediate Heat Exchanger 16 of low temperature side pulse tube refrigerating machine and carries out precooling by heat bridge 15 and to the Intermediate Heat Exchanger 16 of low temperature pulse tubes refrigeration machine; At the second cool end heat exchanger 12 place, a part of gas pressure fluctuation enters thermal buffer tube 13, and another part enters Intermediate Heat Exchanger 16, obtains liquid helium region refrigeration at the 4th regenerator 18 port of export and low-temperature end cool end heat exchanger 19.
In the Stirling Type Pulse Tube Cryocooler of liquid nitrogen temperature, pressure wave generator 1 produces pressure oscillation, promotes He 4move back and forth, in the first regenerator 3, produce refrigeration effect, produce certain refrigerating capacity by the first cool end heat exchanger 4 in liquid nitrogen temperature thus, refrigerating capacity is passed to the second cool end heat exchanger 14 in thermocompressor by heat bridge 15, as the low-temperature receiver of thermocompressor.In thermocompressor, the second hot end heat exchanger 10 works in room temperature, or adopts mode of heating to work in high temperature; Thermocompressor relies on temperature difference work between the second hot end heat exchanger 10 and the second cool end heat exchanger 14, under the effect of drive motors 4, promotes He 4or He 3moving back and forth and experience the thermodynamic cycle of V-M type, is the kinetic energy of gas in the second regenerator 11 thermal power transfer, and then produces larger pressure oscillation;
The refrigerating capacity that liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler produces is simultaneously as the low-temperature receiver of low temperature side pulse tube refrigerating machine; Low temperature side cool end heat exchanger 19 heat pump, as drive source, is transported to Intermediate Heat Exchanger 16 by the 3rd regenerator 17 and the 4th regenerator 17, and then arrives liquid helium region by the gas pressure fluctuation that thermocompressor produces;
In liquid helium region, helium volumetric specific heat capacity increases, and the thermal capacitance of common fillers reduces, and therefore in the 4th regenerator 18, adopts magnetic heat-storing material.
Liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler shown in Fig. 1 adopts U-shaped structure, the first pulse tube 5 and the parallel placement of the first regenerator 3, and its hot junction adopts inertia tube to add the mode phase modulation of air reservoir;
Low temperature side pulse tube refrigerating machine adopts valve to add the mode phase modulation of air reservoir, the second pulse tube hot end heat exchanger 21 and Intermediate Heat Exchanger 16 entrance is connected at the second valve 22, form bidirection air intake mechanism, jointly phase modulating mechanism is formed with the second valve 23 and the second air reservoir 24, for regulating relation between pressure oscillation and gas velocity, form suitable pressure x velocity boundary condition.
Embodiment 2
As shown in Figure 2, the present embodiment structure and embodiment 1 structure substantially similar, but low temperature side pulse tube refrigerating machine is two-layer configuration, and it can obtain lower cryogenic temperature; Connect the 3rd pulse tube 26, the 3rd pulse tube hot end heat exchanger 27 and the 3rd air reservoir 28 successively at the port of export of described 3rd regenerator 17, the connecting line between the 3rd air reservoir 28 and the 3rd pulse tube hot end heat exchanger 27 is installed the 4th valve 30; The connecting line that described second hot end heat exchanger 10 exports between the 3rd pulse tube hot end heat exchanger 27 entrance is equipped with the 3rd valve 29; Described 3rd valve 29, the 4th valve 30 and the 3rd air reservoir 28 be composition the second phase modulating mechanism jointly.
Embodiment 3
As shown in Figure 3, the present embodiment structure and embodiment 1 structure substantially similar, but the phase modulating mechanism of low temperature side pulse tube refrigerating machine changes, eliminate valve and air reservoir, the first linear electric motors 25 are adopted to carry out phase modulation, first linear electric motors 25 are installed on outside the second pulse tube hot end heat exchanger 21, first linear electric motors 25 are the one of Typical linear compressor, comprise the structures such as coil, mover, spring and piston, utilize the various combination of parameters of operating part, realize different pressure and velocity boundary conditions, thus obtain suitable phase place and impedance relationship.
Embodiment 4
As shown in Figure 4, the present embodiment structure and embodiment 2 structure substantially similar, low temperature side pulse tube refrigerating machine adopt dipolar configuration; Be similar to embodiment 3, the phase modulating mechanism of low temperature side pulse tube refrigerating machine changes, and have employed linear electric motors and instead of valve and air reservoir, adopts the first linear electric motors 25 to carry out phase modulation outside the second pulse tube hot end heat exchanger 21; 3rd pulse tube hot end heat exchanger 27 hot junction adopts the second motor 31 to carry out phase modulation, and principle is with embodiment 3.
Embodiment 5
Embodiment 5 basic system is with embodiment 1, and low temperature side pulse tube refrigerating machine is single step arrangement and adopts valve air reservoir phase modulation; But liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler adopts coaxial configuration, in the middle of the first pulse tube 5 displacement first regenerator 3, the first regenerator 3 is annular.Concrete structure as shown in Figure 5.
Embodiment 6
Embodiment 6 basic system is with embodiment 2, and low temperature side pulse tube refrigerating machine is two-layer configuration and adopts valve air reservoir phase modulation; But liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler adopts coaxial configuration, in the middle of the first pulse tube 5 displacement first regenerator 3, the first regenerator 3 is annular; Concrete structure as shown in Figure 6.
Embodiment 7
Embodiment 5 basic system is with embodiment 3, and low temperature side pulse tube refrigerating machine is single step arrangement and adopts linear electric motors phase modulation; But liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler adopts coaxial configuration, in the middle of the first pulse tube 5 displacement first regenerator 3, the first regenerator 3 is annular; Concrete structure as shown in Figure 7.
Embodiment 8
Embodiment 6 basic system is with embodiment 4, and low temperature side pulse tube refrigerating machine is two-layer configuration and adopts linear electric motors phase modulation; But liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler adopts coaxial configuration, in the middle of the first pulse tube 5 displacement first regenerator 3, the first regenerator 3 is annular.Concrete structure as shown in Figure 8.
Relative to traditional liquid helium region refrigeration machine, the pulse tube refrigerating machine of the V-M type thermocompressor driving of each liquid helium region of above-described embodiment, utilize V-M type thermocompressor, overcome the shortcoming of electric drive mechanical commprssor, utilize the temperature difference to produce pressure oscillation, take full advantage of the advantages such as this compressor operating frequency is low, compact conformation, machine system adopts valveless oilless (oil free) compressor, reliability is improved, and volume significantly reduces simultaneously; In addition core component is reversible Stirling cycle, system effectiveness that can be higher than traditional type refrigeration machine; Low temperature side of the present invention eliminates the moving components such as displacer in addition, and adopt structure isolation low temperature and the room temperatures such as pulse tube, reliability and life-span are largely increased, and the vibration being simultaneously delivered to cold head load reduces; The continuous operation of potential guarantee more than tens thousand of hours.

Claims (7)

1. a pulse tube refrigerating machine for the V-M type thermocompressor driving of liquid helium region, it comprises: liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler, V-M type thermocompressor and low temperature side pulse tube refrigerating machine and heat bridge;
Described liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler is made up of the pressure wave generator be connected successively, the first hot end heat exchanger, the first regenerator, the first cool end heat exchanger, the first pulse tube, the first pulse tube hot end heat exchanger, inertia tube and the first air reservoir;
Described V-M type thermocompressor is made up of the drive motors be connected successively, the second hot end heat exchanger, the second regenerator, the second cool end heat exchanger, thermal buffer tube and thermal buffer tube hot end heat exchanger; Wherein said thermal buffer tube hot end heat exchanger is communicated with upper piston area space by tube connector;
Described low temperature side pulse tube refrigerating machine is made up of the Intermediate Heat Exchanger be connected successively, the 3rd regenerator, the 4th regenerator, low-temperature end cool end heat exchanger, the second pulse tube, the second pulse tube hot end heat exchanger, the first valve, the second valve and the second air reservoir;
Connecting line between described second pulse tube hot end heat exchanger and the second air reservoir is equipped with the first valve; Connecting line between described second pulse tube hot end heat exchanger outlet and the second hot end heat exchanger entrance is equipped with the second valve, and described first valve, the second valve and the second air reservoir form the first phase modulating mechanism jointly;
First cool end heat exchanger of described liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler contacts with described heat bridge respectively with the second cool end heat exchanger of described V-M type thermocompressor and is connected, and the second described cool end heat exchanger is connected with the Intermediate Heat Exchanger of low temperature side pulse tube refrigerating machine and carries out precooling by heat bridge and to the Intermediate Heat Exchanger of low temperature side pulse tube refrigerating machine; At the second cool end heat exchanger place, a part of gas pressure fluctuation enters thermal buffer tube, and another part enters Intermediate Heat Exchanger, obtains liquid helium region refrigeration at the 4th regenerator port of export and low-temperature end cool end heat exchanger.
2. by the pulse tube refrigerating machine that the V-M type thermocompressor of liquid helium region according to claim 1 drives, it is characterized in that, described low temperature side pulse tube refrigerating machine adopts two-stage pulse tube structure: connect the 3rd pulse tube, the 3rd pulse tube hot end heat exchanger and the 3rd air reservoir successively at the port of export of described 3rd regenerator, the connecting line between the 3rd air reservoir and the 3rd pulse tube hot end heat exchanger is installed the 4th valve; Connecting line between described second hot end heat exchanger outlet and the 3rd pulse tube hot end heat exchanger entrance is equipped with the 3rd valve; Described 3rd valve, the 4th valve and the 3rd air reservoir form the second phase modulating mechanism jointly.
3., by the pulse tube refrigerating machine that the V-M type thermocompressor of liquid helium region according to claim 1 drives, it is characterized in that, described first phase modulating mechanism is substituted by the first linear electric motors.
4., by the pulse tube refrigerating machine that the V-M type thermocompressor of liquid helium region according to claim 2 drives, it is characterized in that, the second described phase modulating mechanism is substituted by the second linear electric motors.
5., by the pulse tube refrigerating machine that the V-M type thermocompressor of liquid helium region according to claim 1 drives, it is characterized in that, described liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler has two kinds of patterns:
The first pattern is: the U-shaped liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler that described first pulse tube and the first regenerator are placed side by side;
The second pattern is: the first pulse tube is positioned at the coaxial type liquid nitrogen temperature Stirling Type Pulse Tube Cryocooler among the first regenerator, this first regenerator shape ringwise.
6. by the pulse tube refrigerating machine that the V-M type thermocompressor of liquid helium region according to claim 1 drives, it is characterized in that, in described low temperature side pulse tube refrigerating machine, the 4th regenerator adopts magnetic material as filler.
7., by the pulse tube refrigerating machine that the V-M type thermocompressor of liquid helium region according to claim 1 drives, it is characterized in that, in the Stirling Type Pulse Tube Cryocooler of described liquid nitrogen temperature, adopt He 4as gas working medium; Described V-M type thermocompressor and low temperature side pulse tube refrigerating machine adopt He 3or He 4as gas working medium.
CN201210208787.1A 2012-06-19 2012-06-19 Pulse tube refrigerator driven by V-M-type thermocompressor in liquid helium temperature region Active CN103512258B (en)

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JP2008075991A (en) * 2006-09-22 2008-04-03 Sumitomo Heavy Ind Ltd Cylinder of cold accumulating type refrigerator, cold accumulating type refrigerator, cryopump having cold accumulating type refrigerator, re-condenser, superconducting magnet device and semiconductor detecting device
CN101294752A (en) * 2007-04-29 2008-10-29 中国科学院理化技术研究所 Thermal coupling multilevel pulsatron refrigerating machine
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