CN108800644A - A kind of rack and pulse type free-piston Stirling cooler - Google Patents
A kind of rack and pulse type free-piston Stirling cooler Download PDFInfo
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- CN108800644A CN108800644A CN201810437872.2A CN201810437872A CN108800644A CN 108800644 A CN108800644 A CN 108800644A CN 201810437872 A CN201810437872 A CN 201810437872A CN 108800644 A CN108800644 A CN 108800644A
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- piston
- tube
- compression
- expansion
- rack
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Classifications
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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
- F25B9/14—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
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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
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/14—Compression machines, plants or systems characterised by the cycle used
- F25B2309/1412—Pulse-tube cycles characterised by heat exchanger details
Abstract
Rack according to the present invention and pulse type free-piston Stirling cooler,Pulse type free-piston Stirling cooler includes linear motor,Compression unit,Expanding machine unit,Undamped dynamic absorber unit,Rack,And shell,Rack includes flange,The piston tube and pedestal being arranged in flange,Wherein,Flange shape in disk form,The side of the flange is additionally provided with concentric roundel,Pedestal is cylindrical in shape,One end is connected with the other side of flange,The other end is free end,The center line of pedestal is overlapped with the center line of flange,Piston tube is straight pipe,One end open is located at the outside of roundel,Pulse tube for connecting refrigeration machine,Another end opening is located in pedestal,There is cylinder-piston chamber in piston tube,Compression piston and expansion piston for accommodating refrigeration machine,Multiple through-holes for penetrating piston tube wall are provided in plunger shaft,The outer diameter of compression piston,The outer diameter of expansion piston and the internal diameter of pulse tube are identical.
Description
Technical field
The invention belongs to refrigerating fields, and in particular to a kind of rack and pulse type free-piston Stirling cooler.
Background technology
Cryogenic refrigeration mechanism cold is widely used in aviation, military affairs, surpasses as a kind of method of important acquisition low temperature
It leads, communicate, electronics, metallurgy, industrial gasses liquefy and the fields such as biologic medical.Especially in recent years, Cryo Refrigerator is in ice
The application demand of case, wine cabinet etc. is increasing.
The theoretical refrigerating efficiency of sterlin refrigerator is equal to Carnot efficiency, and efficiency when actual motion is also all at present
Highest one kind of efficiency in Cryo Refrigerator.Free-piston Stirling cooler structure is by William Beale in 20th century 60
Age proposes, is mainly characterized by using skills such as linear compressor driving, flexure spring support, clearance seal combination gas bearing
Art, with compact-sized, noise is small, long lifespan, high reliability.Sunpower companies exploitation liberty of commerce piston this
Highest relative carnot efficiency of the special woods refrigeration machine in liquid nitrogen temperature has broken through 20%, subsidiary Stirling Ultracold
What the low temperature refrigerator that company (former Global Cooling companies) develops used is exactly free-piston Stirling cooler.2012,
Stirling Ultracold companies compare two-stage overlapping low-temperature refrigerator and Stirling low temperature refrigerator, find to use free-piston
The low temperature refrigerator of sterlin refrigerator has significant advantage, compared with traditional low temperature refrigerator, Stirling low temperature in energy-saving square face
Refrigerator can save energy more than 50%.
Since space refrigeration has strict requirements to energy consumption, the efficiency for improving refrigeration machine is exactly space refrigerating machine always
Mainstream research direction, the space refrigerating machine of mainstream is mainly sterlin refrigerator and vascular refrigerator at present, both is compared
Theoretical refrigerating efficiency, for thermodynamics, equality of temperature limits the pulse tube refrigeration engine efficiency under work and is always less than stirling refrigeration
Machine.
Why the efficiency of vascular refrigerator is less than sterlin refrigerator, is primarily due to vascular refrigerator unlike Stirling
Refrigeration machine has structure as expansion piston by the expansion work " feedback " of gas to compression chamber, the expansion work in vascular hot junction mainly with
The form of heat is dissipated to by phase modulating mechanism such as inertia tube and aperture in environment, causes vascular refrigerator less efficient.
Invention content
In order to while ensureing vascular refrigerator own advantages, improve its refrigerating efficiency, acoustic power recovery type pulse tube refrigeration
Machine comes into being.For the occasion of small refrigeration requirement, the sound work(that vascular refrigerator dissipates in phase modulating mechanism is very small, and sound work(returns
The meaning of receipts is not very notable, and for the high-power pulse tube refrigeration machine to freeze in high temperature area, what hot junction was dissipated
Sound work(is very considerable, is expected to greatly improve its refrigerating efficiency to effective recycling of this part sound work(.Therefore, acoustic power recovery type vascular
Refrigeration machine has higher researching value in terms of middle warm area High cooling power.
One of the objects of the present invention is to provide a kind of new frames and vascular for free-piston Stirling cooler
Type free-piston Stirling cooler.
The present invention provides a kind of racks for free-piston Stirling cooler, have the feature that, including method
Orchid, the piston tube being arranged in flange and pedestal, wherein the side of flange shape in disk form, the flange is additionally provided with one heart
Roundel, pedestal is cylindrical in shape, and one end is connected with the other side of flange, and the other end is free end, the center line and flange of pedestal
Center line overlap, piston tube is straight pipe, and the one end open for being located at outside is located at the outside of roundel, for connecting refrigeration machine
Pulse tube, another end opening is located in pedestal, has cylinder-piston chamber, the compression piston for accommodating refrigeration machine in piston tube
And expansion piston, be provided with multiple through-holes for penetrating piston tube wall in plunger shaft, the outer diameter of compression piston, expansion piston it is outer
The internal diameter of diameter and pulse tube is identical.
In the rack provided by the present invention for free-piston Stirling cooler, it can also have the feature that：
Wherein, multiple connecting holes are provided on flange.
In addition, in the rack provided by the present invention for free-piston Stirling cooler, can also have such
Feature：Wherein, multiple connecting screw holes are provided on the free end of pedestal.
In addition, in the rack provided by the present invention for free-piston Stirling cooler, can also have such
Feature：Wherein, for the axis of through-hole perpendicular to piston tube axis, the section of through-hole is long trough.
The present invention provides a kind of pulse type free-piston Stirling coolers, have the feature that, including rack, machine
Frame is the rack of any one above-mentioned.
In addition, in pulse type free-piston Stirling cooler provided by the invention, which is characterized in that further include straight line
Motor, linear motor include outer yoke, interior yoke and mover, outer yoke, interior yoke are separately positioned in rack and outer yoke,
There is gap, mover to be arranged between interior yoke in gap.
In addition, in pulse type free-piston Stirling cooler provided by the invention, which is characterized in that further include compression
There is compression piston, compression piston spring, compression piston spring to be fixedly connected with rack by connector for unit, compression unit,
Compression piston is arranged in piston tube, and one end is connected with mover and is connected with compression piston spring, and the other end is free end.
In addition, in pulse type free-piston Stirling cooler provided by the invention, which is characterized in that further include expansion
Machine unit, expanding machine unit include expansion piston, expansion piston spring, expansion piston bar, level-one hot end heat exchanger, two level hot junction
Heat exchanger, regenerator, pulse tube, cool end heat exchanger, level-one hot end heat exchanger is cylindrical, is sleeved on the outer wall of piston tube and sets
It sets on the end face of roundel, one end of pulse tube is connected with piston tube lateral ends, and the other end is connected with cool end heat exchanger, returns
Hot device is cylindrical, is arranged in the outside of pulse tube, and one end is connected with cool end heat exchanger, the other end and level-one hot end heat exchanger phase
Even, two level hot end heat exchanger is arranged in pulse tube, and for expansion piston in piston tube, expansion piston spring passes through connector and machine
Frame is fixedly connected, and one end of expansion piston bar is connected with expansion piston, the other end pass through compression piston, after compression piston spring with
Expansion piston spring is connected, and compression piston, expansion piston and plunger shaft constitute compression chamber, expansion piston, the heat exchange of two level hot junction
Device and plunger shaft constitute expansion chamber.
The effect of invention
According to coaxial pulse-tube type free-piston Stirling cooler according to the present invention, including driving unit, compression list
Member, expanding machine unit.
The coaxial pulse-tube type free-piston Stirling cooler of the present invention eliminates traditional free-piston Stirling cooler
Longer low-temperature expansion piston is replaced with shorter room-temperature zone work work recycling expansion piston.Free-piston Stirling cooler
Expansion cylinder become the pulse tube of vascular cold finger, pulse tube cold end is disposed with the air deflector of laminarization, and hot junction is equipped with two level
Hot end heat exchanger.The advantages of this change combines free-piston Stirling cooler and vascular refrigerator, by cancelling cold
The expansion piston of hot junction high frequency motion eliminates pumping loss, shuttle loss and axial thermal conductivity that low-temperature expansion piston is brought
Loss.Shorter swell at room temperature piston is set by hot junction and solves the problems, such as the acoustic power recovery of vascular refrigerator, therefore, when complete
When recycling cold end sound work(, which is Carnot's cycle efficiency.Meanwhile it taking
The low-temperature expansion piston that disappears reduces refrigeration machine manufacture difficulty, reduces overall mass.
Description of the drawings
Fig. 1 is pulse type free-piston Stirling cooler diagrammatic cross-section in the embodiment of the present invention；
Fig. 2 is the stereoscopic schematic diagram of rack in the embodiment of the present invention；
Fig. 3 is A direction views in Fig. 2；
Fig. 4 is C-C sectional views in Fig. 3；
Fig. 5 is the perspective cross-sectional schematic diagram of rack in the embodiment of the present invention；
Fig. 6 is a kind of perspective cross-sectional schematic diagram of rack in the embodiment of the present invention；And
Fig. 7 is the pulse type free-piston Stirling cooler section with segmented regenerator in the embodiment of the present invention
Schematic diagram.
Specific implementation mode
It is real below in order to make the technical means, the creative features, the aims and the efficiencies achieved by the present invention be easy to understand
Example combination attached drawing is applied to be specifically addressed the coaxial pulse-tube type free-piston Stirling cooler of the present invention.
Embodiment one
As shown in Figure 1, coaxial pulse-tube type free-piston Stirling cooler 100 include linear motor 1, it is compression unit, swollen
Swollen machine unit, undamped dynamic absorber unit 4, rack 50 and shell 60.
As shown in Fig. 2,3,4,5, rack 50 includes flange 52, the piston tube 51 being arranged in flange 52 and pedestal 53,
Wherein, 52 shape in disk form of flange, the side of the flange are additionally provided with concentric roundel 521, on flange 52
It is even to be provided with multiple connection through-holes.
Pedestal 53 is cylindrical in shape, and one end is connected with the side of flange 52, and the other end is free end, the center line and method of pedestal 53
The center line of orchid 52 overlaps, and is provided with multiple connecting screw holes on the free end of pedestal 53, and in embodiment, pedestal 53 is around flange
Four supporting legs of 52 center line setting.
Piston tube 51 be straight tube, be arranged in flange 52 and with 52 coaxial line of flange, lateral ends opening be located at roundel
521 outside, inner opposite end opening are located in pedestal 53, have cylinder-piston chamber in piston tube 51, are provided in plunger shaft more
A perpendicular to piston tube axis and to penetrate the through-hole 511 of piston tube wall, in embodiment, the section of through-hole 511 is arc groove, number
Amount is 3.
As a kind of deformation, as shown in fig. 6, having multiple through-hole 511A in rack 50A, the section of through-hole 511A is length
The length direction in hole, the slot hole is parallel to 51 axis of piston tube.Compared with conventional stent is using rectangle books circulation channel, this hair
The bright circulation passage that multiple uniformly distributed circular apertures are along the circumferential direction opened on engine base as gas working medium.Advantage is：It is multiple
Circular aperture can make flowing more even of the gas when passing in and out compression chamber, and gas working medium is made more to uniform flow backheat
Device, to fully with the filler contact heat-exchanging in regenerator, make full use of the heat exchange area of regenerator.But traditional holder uses
The big channel of rectangle can be such that gas is flowed when passing in and out compression chamber uneven, and some channel gas flows are big, the channel gas stream that has
Measure small, this non-uniform flowing can further influence the contact heat-exchanging process of gas and regenerator matrix, lead to backheat
The heat exchange area of device filler is not efficiently used, and the regenerative losses of regenerator greatly increase, and the refrigerating efficiency of refrigeration machine is drastically
Decline.Preferably, the diameter of circular hole is in 0.5mm~2mm.
Linear motor 1 includes outer yoke 11, interior yoke 14 and mover, and outer yoke 11, interior yoke 14 are separately positioned on machine
There is gap, mover to be arranged in gap, mover includes permanent magnet 13 and permanent magnetism body support frame on frame and between outer yoke, interior yoke
15。
As shown in Figure 1, linear motor 1 includes mainly outer yoke 11, coil 12, permanent magnet 13, interior yoke 14, permanent magnet branch
Frame 15, mover include permanent magnet 13, permanent magnetism body support frame 15, connector 16, fixing nut 18, compression piston 19 and compression piston
Flat spring 17 (only takes the 1/3 of flat spring quality) when calculating mover quality, and permanent magnetism body support frame 15 is connected with permanent magnet 13, and with
Compression piston 19 and connector 16 are connected through a screw thread.Outer yoke 11 is soft magnetic materials with interior yoke 14, commonly uses electric work pure iron, silicon
The materials such as steel disc make, and permanent magnet 13 is permanent-magnet material, commonly uses Ru-Fe-Mn, alnico permanent magnetic material to make.Outer yoke 11, line
Circle 12, permanent magnet 13, interior yoke 14 are annular, and using coaxially arranged.Outer yoke 11, interior yoke 14 are separately positioned on machine
There is gap, mover to be arranged on frame 50 and between outer yoke, interior yoke in gap.
When coil is passed through direct current, outer yoke 11 and interior yoke 14 can form magnetic force loop line, in 11 He of outer yoke
Magnetic pole is generated on interior yoke 14.When being passed through alternating current in coil, permanent magnet 13 will be done back and forth by alternating electromagnetic force
Linear motion.When permanent magnet 13 does linear reciprocating motion, compression piston 19 can be driven to do linear reciprocating motion, compression piston plate
Spring 17 provides axial reciprocating elastic power and radial support.
Compression unit includes connector 16, compression piston flat spring 17, fixing nut 18, compression piston 19.Compression piston
Flat spring 17 is connected by fixing nut 18 with connector 16, and compression piston flat spring 17 is fixed with rack 50 by connector
Connection, compression piston 19 are arranged in plunger shaft, and one end is connected with mover and is connected with compression piston spring 17, and the other end is certainly
By holding.
Expanding machine unit include expansion piston 21, expansion piston flat spring 22, piston rod 23, level-one hot end heat exchanger 26,
Two level hot end heat exchanger 33, regenerator 25, pulse tube 31, cool end heat exchanger 24, cold finger shell 35,
Level-one hot end heat exchanger 26 is cylindrical, is sleeved on the outer wall of piston tube 51 and is arranged in the end face of roundel 521
On, level-one hot end heat exchanger 26 is separate structure with rack 50, and level-one hot end heat exchanger 26 and the outer wall interference of piston tube 51 are matched
It closes.
One end of pulse tube 31 is connected with 51 lateral ends of piston tube, and the other end is connected with cool end heat exchanger 24,
Regenerator 25 is in the cylindrical shape of ring-shaped section and ring-shaped, is arranged in the outside of pulse tube 31, one end and cool end heat exchanger 24
It is connected, the other end is connected with level-one hot end heat exchanger 26.Regenerator 25 is using polyester film, nylon and polytetrafluoroethylene (PTFE) material
Any one in material is made, and using being made of polyester film, the thickness of polyester film is regenerator 25 in embodiment
20-50μm。
Two level hot end heat exchanger 33 is arranged in pulse tube 31, is located at the junction of pulse tube 31 and piston tube 51, two level
Hot end heat exchanger 33 is separate structure with rack 50, and two level hot end heat exchanger 33 and the inner wall of piston tube 51 are interference fitted.
Expansion piston 21 is arranged in piston tube 51, and expansion piston flat spring 22 is fixed by connector and rack 50 to be connected
Connect, one end of piston rod 23 is connected with expansion piston 21, the other end pass through compression piston 19, after compression piston flat spring 17 with it is swollen
Swollen piston flat spring 22 is connected,
Compression piston 19, expansion piston 21 and plunger shaft constitute compression chamber, compression piston 19, two level hot end heat exchanger 33
And plunger shaft constitutes expansion chamber, expansion chamber is coaxially arranged with compression chamber.
Cold finger shell 35 is arranged in the outside of level-one hot end heat exchanger 26, regenerator 25, cool end heat exchanger 24, and shell 60 is arranged
In rack 50 and the outside of expanding machine unit 30, shell 60, cold finger shell 35 and rack 50 are linked into an integrated entity by connector.
Radiator 27 is located at the outside of level-one hot end heat exchanger 26 and is arranged on cold finger shell 35, level-one hot end heat exchanger 26
The radiator 27 that heat is passed to outside by cold finger shell 35, is finally released to environment.
Undamped dynamic absorber unit 4 is connected with shell 60 and is arranged in the outside of shell 60, for being carried out to refrigeration machine
Damping.
The motion process and gas flow of expansion piston and compression piston：
Expansion piston flat spring 22 is fixed with piston rod 23, and expansion piston 21 is connected with piston rod 23.
Expansion piston 21 is pure pneumatic actuation, is generated using the displacement phase difference between expansion piston 21 and compression piston 19
Refrigeration effect, 70 °~100 ° of the displacement of the leading compression piston of the displacement of usual expansion piston 21 19, in low-temperature space (cold head temperature
At -100 DEG C or less) when, displacement phase difference can be decreased to 50~60 °.Since linear motor is simple alternating current electric excitation, so swollen
The movement of swollen piston 21 and compression piston 19 be also be in sinusoidal continuous movement, but in order to illustrate its operation principle, it is assumed that
Expansion piston 21 does the movement of intermittent touchdown formula with compression piston 19 according to circulation law.
Sound wave compression process：Expansion piston 21 rests on that top dead centre is motionless, and compression piston 19 is moved upwards by lower dead center, this
When main compression chamber 29 in sound wave compressed, and flow into the level-one hot end heat exchanger 26 on the outside of cylinder, compression process generated
Heat is released to level-one hot end heat exchanger 26, and heat is passed to the heat dissipation in outside by level-one hot end heat exchanger 26 by outer housing again
Device 27, is finally released to environment.Ideally think that cylinder and outer housing are complete heat conduction, while level-one hot end heat exchanger
26 is infinitely great with the heat exchange area of radiator 27, therefore the temperature of working medium remains unchanged.But in real process, isotherm compression is
It is impossible, and expansion piston 21 can not possibly intermittent movement, when compression piston 19 moves upwards, expansion piston 21 has been
Through starting to move downward.
Regenerator exothermic process：Compression piston 19 moves to motionless after top dead centre, and expansion piston 21 moves downward, at this time sound
Wave comes into full contact with heat exchange by the filler in regenerator 25, with regenerator 25, heat is discharged to regenerator 25, at this time backheat
The temperature of device 25 increases, acoustic wave temperature and pressure reduction.But in practical heat transfer process, 25 heat transfer process of regenerator is not fixed
Hold, it is also not possible to the complete heat exchange of 25 filler of real sound wave and regenerator.
Sound wave Laminar Flow process：Gas flows through after cool end heat exchanger 24 through air deflector 32, enters as a laminar flow
Gas in pulse tube 31 is pushed to expansion chamber 28 by pulse tube 31.After gas is squeezed, pressure and temperature rises.The heat of generation
It is radially transferred to level-one hot end heat exchanger 26 by two level hot end heat exchanger 33, be finally transmitted to radiator 27 and is released to ring
Border.Gas expansion for doing work in expansion chamber 28, auxiliary pushing expansion piston become smaller, play to lower dead center, work(recycling compression chamber
The effect of recycling sound work(.In practical work process, compression piston 19 can't rest on always top dead centre, but can be with swollen
Swollen piston 21 moves downwardly together, but it need to be pointed out that the two is not movement in the same direction but the leading compression piston of expansion piston one
Fixed phase angle.
Sound wave process of refrigerastion：Expansion piston 21 moves up to top dead centre since lower dead center, and compression piston 19 moves to
Lower dead center, expansion piston 21 push back to the sound wave in expansion chamber 28 in pulse tube 31, gas swelling heat absorption in pulse tube, production
Raw refrigeration effect reaches lowest refrigerating temperature at 31 top of pulse tube at air deflector 32.The cold of generation is changed by cold end
Hot device 24 is exported to cold environment.Sound wave working medium returns in regenerator 25 along original route and comes into full contact with heat exchange with filler again, inhales
After receiving the heat in regenerator 25, returns to main compression chamber 29 and wait for next second compression.The temperature and pressure of the process sound wave
Rise, 25 temperature of regenerator declines.In real process, when compression piston 19 reaches lower dead center expansion piston 21 and not up on
Stop, but during returning to top dead centre, but its still advanced compression piston 19 on displacement wave phase.
The present embodiment is suitable for the cryogenic temperature of 220K (- 53 DEG C) or more, can provide the refrigerating capacity of 50W-200W.
Embodiment two
The present embodiment other structures are identical as embodiment one, the difference is that further including positioned at the outer of level-one hot end heat exchanger 26
Heat is passed to the radiator in outside by side and the radiator 27 of setting on the shell, level-one hot end heat exchanger 26 by outer housing
27, finally it is released to environment.
Embodiment three
The present embodiment other structures are identical as embodiment two, the difference is that further including setting in pulse tube one end and being located at arteries and veins
Air deflector 32 in washing pipe, the air deflector 32 are connected with cool end heat exchanger 24.
Example IV
The present embodiment other structures are identical as embodiment three, the difference is that between cool end heat exchanger 24 and regenerator 25 also
It is provided with the first filtering layer, the first filtering layer is in the tubular of ring-shaped section and ring-shaped, is made of stainless steel cloth.The string diameter of stainless steel wire is
20-50 μm, in embodiment, the string diameter of stainless steel wire is 30 μm.Helium is small by pressure drop when the stainless steel wire layer, stainless steel wire layer
It is strong with cold-storage ability, the strong feature of mobility.
Embodiment five
The present embodiment other structures are identical as example IV, unlike and hot end heat exchanger
26 and regenerator 25 be additionally provided with the second filtering layer, the second filtering layer is in the tubular of ring-shaped section and ring-shaped, using steeping wool
It is made.The string diameter of wool is 10-30 μm, and in embodiment, the string diameter of wool is 20 μm.There is wool layer buffering to assemble, adjustment dress
The characteristics of with size.
As shown in fig. 7, segmented regenerator is divided into three sections, from top to bottom respectively stainless steel cloth, polyester film with
And steeping wool, length ratio are 1:8:1, the voidage of stainless steel cloth, polyester film and steeping wool is respectively
70%, 50%, 70%.
Embodiment six
The present embodiment other structures are identical as embodiment one, the difference is that two level hot end heat exchanger 33 is one with rack 50
Structure.In embodiment, two level hot end heat exchanger 33 is made with 50 entirety of rack using aluminium.
Two level hot end heat exchanger 33 and the integral structure of rack 50 effectively eliminate two level hot end heat exchanger 33 and rack
Thermal contact resistance between 50, meanwhile, two level hot end heat exchanger 33 can also play the role of air deflector.
Embodiment seven
The present embodiment other structures are identical as embodiment six, the difference is that level-one hot end heat exchanger 26 is one with rack 50
Structure.In embodiment, level-one hot end heat exchanger 26, two level hot end heat exchanger 33 and 50 entirety of rack are made using aluminium.
The integral structure of level-one hot end heat exchanger 26, two level hot end heat exchanger 33 and rack 50 effectively eliminates level-one
Thermal contact resistance between hot end heat exchanger 26, two level hot end heat exchanger 33 and rack 50, meanwhile, two level hot end heat exchanger 33 may be used also
To play the role of air deflector.
The effect of embodiment
The pulse type free-piston Stirling cooler of the present embodiment eliminate traditional free-piston Stirling cooler compared with
Long low-temperature expansion piston is replaced with shorter room-temperature zone work work recycling expansion piston.Free-piston Stirling cooler
Expansion cylinder becomes the pulse tube of vascular cold finger, and pulse tube cold end is disposed with the air deflector of laminarization, and hot junction is equipped with two level heat
Hold heat exchanger.The advantages of this change combines free-piston Stirling cooler and vascular refrigerator, by cancelling cold and hot
The expansion piston for holding high frequency motion eliminates pumping loss, shuttle loss and axial thermal conductivity damage that low-temperature expansion piston is brought
It loses.Shorter swell at room temperature piston is set by hot junction and solves the problems, such as the acoustic power recovery of vascular refrigerator, therefore, when returning completely
When receiving cold end sound work(, which is Carnot's cycle efficiency.Meanwhile cancelling
Low-temperature expansion piston reduces refrigeration machine manufacture difficulty, reduces overall mass.
The above embodiment is the preferred case of the present invention, is not intended to limit protection scope of the present invention.
Claims (8)
1. a kind of rack for free-piston Stirling cooler, which is characterized in that including：
Flange, the piston tube being arranged in the flange and pedestal,
Wherein, the side of flange shape in disk form, the flange is additionally provided with concentric roundel,
The pedestal is cylindrical in shape, and one end is connected with the other side of flange, and the other end is free end, the center line of the pedestal and institute
The center line for stating flange overlaps,
The piston tube is straight pipe, and one end open is located at the outside of the roundel, the pulse tube for connecting refrigeration machine, separately
One end open is located in the pedestal, has cylinder-piston chamber in the piston tube, and the compression for accommodating the refrigeration machine is lived
Plug and expansion piston are provided with multiple through-holes for penetrating the piston tube wall in the plunger shaft,
The internal diameter of the outer diameter of the compression piston, the outer diameter of the expansion piston and the pulse tube is identical.
2. the rack according to claim 1 for free-piston Stirling cooler, it is characterised in that：
Wherein, the axis of the through-hole is perpendicular to the piston tube axis.
3. the rack according to claim 1 for free-piston Stirling cooler, it is characterised in that：
Wherein, multiple connecting screw holes are provided on the free end of the pedestal.
4. the rack according to claim 1 for free-piston Stirling cooler, it is characterised in that：
Wherein, the section of the through-hole is flute profile.
5. a kind of pulse type free-piston Stirling cooler, which is characterized in that including：
Rack, the rack are the rack described in any one in claim 1-4.
6. pulse type free-piston Stirling cooler according to claim 5, which is characterized in that further include：
Linear motor,
The linear motor includes outer yoke, interior yoke and mover, and the outer yoke, the interior yoke are separately positioned on described
There is gap, the mover setting is in the gap in rack and between outer yoke, interior yoke.
7. pulse type free-piston Stirling cooler according to claim 5, which is characterized in that further include：
Compression unit,
There is the compression unit compression piston, compression piston spring, the compression piston spring to pass through connector and the machine
Frame is fixedly connected, and the compression piston is arranged in the piston tube, one end be connected with the mover and with the compression piston
Spring is connected, and the other end is free end.
8. pulse type free-piston Stirling cooler according to claim 5, which is characterized in that further include：
Expanding machine unit,
The expanding machine unit includes expansion piston, expansion piston spring, expansion piston bar, level-one hot end heat exchanger, two level heat
Heat exchanger, regenerator, pulse tube, cool end heat exchanger are held,
The level-one hot end heat exchanger is cylindrical, is sleeved on the outer wall of the piston tube and is arranged in the end face of the roundel
On,
One end of the pulse tube is connected with the piston tube lateral ends, and the other end is connected with the cool end heat exchanger,
The regenerator is cylindrical, is arranged in the outside of the pulse tube, one end is connected with the cool end heat exchanger, the other end
It is connected with the level-one hot end heat exchanger,
Two level hot end heat exchanger is arranged in the pulse tube,
In the piston tube, the expansion piston spring is fixedly connected by connector with the rack expansion piston,
One end of the expansion piston bar is connected with the expansion piston, and the other end passes through the compression piston, the compression piston bullet
It is connected with the expansion piston spring after spring,
The compression piston, the expansion piston and the plunger shaft constitute compression chamber,
The expansion piston, the two level hot end heat exchanger and the plunger shaft constitute expansion chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810437872.2A CN108800644B (en) | 2018-05-09 | 2018-05-09 | Frame and pulse tube type free piston Stirling refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810437872.2A CN108800644B (en) | 2018-05-09 | 2018-05-09 | Frame and pulse tube type free piston Stirling refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108800644A true CN108800644A (en) | 2018-11-13 |
| CN108800644B CN108800644B (en) | 2020-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810437872.2A Active CN108800644B (en) | 2018-05-09 | 2018-05-09 | Frame and pulse tube type free piston Stirling refrigerator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN108800644B (en) | 2020-04-03 |
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