CN208520037U - A kind of expanding machine unit and pulse type free-piston Stirling cooler - Google Patents
A kind of expanding machine unit and pulse type free-piston Stirling cooler Download PDFInfo
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- CN208520037U CN208520037U CN201820685253.0U CN201820685253U CN208520037U CN 208520037 U CN208520037 U CN 208520037U CN 201820685253 U CN201820685253 U CN 201820685253U CN 208520037 U CN208520037 U CN 208520037U
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Abstract
Expanding machine unit and pulse type free-piston Stirling cooler according to the present utility model, expanding machine unit includes expansion piston, expansion piston spring, expansion piston bar, level-one hot end heat exchanger, second level hot end heat exchanger, regenerator, pulse tube and cool end heat exchanger, expansion piston pipe is the pulse tube that straight tube is used to connect refrigeration machine, there is cylindrical heat exchange chamber and cylindrical expansion piston chamber in expansion piston pipe, compression piston pipe is straight tube, there is compression cylinder plunger shaft in compression piston pipe, compression piston chamber and expansion piston chamber coaxial line and it is connected, it is parallel to compression piston cavity axis, multiple connection compression piston chambers and external through-hole are provided on disk, the internal diameter of compression piston chamber is greater than the internal diameter of expansion piston chamber, the internal diameter of expansion piston chamber is greater than the internal diameter of heat exchange chamber, the internal diameter of heat exchange chamber and pulse tube it is interior Diameter is identical, and for expansion piston in expansion piston pipe, compression piston, expansion piston, compression piston chamber and expansion piston chamber constitute compression chamber.
Description
Technical field
The utility model belongs to refrigerating field, and in particular to a kind of expanding machine unit and pulse type free piston stirling system
Cold.
Background technique
A kind of method of the cryogenic refrigeration mechanism cold as important acquisition low temperature, is widely used in aviation, military affairs, surpasses
It leads, communicate, electronics, metallurgy, industrial gasses liquefy and the fields such as biologic medical.Especially in recent years, China aerospace industry
It flourishes, so that Cryo Refrigerator is more and more obvious in the application demand of aerospace, Cryo Refrigerator is in superconduction, infrared spy
Application in terms of survey device and low-temperature gas liquefaction is also more and more extensive.
GLACIER(General Laboratory Active Cryogenic ISS Experiment
It Refrigerator is) that the First that NASA is developed can be used for -80 DEG C of low temperature storage of two platforms in space station and airship simultaneously
Device is freezed using free-piston Stirling cooler, it can be achieved that 4 DEG C to -95 DEG C of cryogenic temperature under wind mode；In water
, it can be achieved that 4 DEG C to -160 DEG C of low temperature stores under refrigerating mode.It is deposited to further increase low temperature during in-orbit and uplink and downlink
Single module unit size (273x460x522mm) has been developed in energy storage power, NASA and University of Alabama Birmingham branch school cooperatively
Low temperature stores product Polar.The device equally uses free-piston Stirling cooler as cold source, it can be achieved that -80 DEG C low
Gentle storage and sample transport, it is 12.7L that maximum, which saves volume,.
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, the pulse tube refrigeration engine efficiency under equality of temperature limit work is always lower than stirling refrigeration
Machine.
Why the efficiency of vascular refrigerator is lower than sterlin refrigerator, is primarily due to vascular refrigerator unlike Stirling
Refrigeration machine has structure as expansion piston for the expansion work " feedback " of gas to compression chamber, the expansion work in vascular hot end mainly with
The form of heat is dissipated in environment by phase modulating mechanism such as inertia tube and aperture, causes pulse tube refrigeration engine efficiency lower.
Utility model content
In order to improve its refrigerating efficiency, acoustic power recovery type pulse tube refrigeration while guaranteeing vascular refrigerator own advantages
Machine comes into being.For the occasion of small refrigeration requirement, the sound function that vascular refrigerator dissipates in phase modulating mechanism is very small, and sound function returns
The meaning of receipts is not very significant, and for the high-power pulse tube refrigeration machine to freeze in high temperature area, what hot end was dissipated
Sound function is very considerable, is expected to greatly improve its refrigerating efficiency to effective recycling of this part sound function.Therefore, acoustic power recovery type vascular
Refrigeration machine has higher researching value in terms of middle warm area High cooling power.
One of the purpose of this utility model is to provide a kind of expansible machine for free-piston Stirling cooler
Unit and pulse type free-piston Stirling cooler.
The utility model provides a kind of expanding machine unit, is arranged on the rack, which is characterized in that including expansion piston,
Expansion piston spring, expansion piston bar, level-one hot end heat exchanger, second level hot end heat exchanger, regenerator, pulse tube and cold end are changed
Hot device, wherein rack includes flange, expansion piston pipe, compression piston pipe and pedestal, flange shape in disk form, the flange
One side is provided with concentric disk, and another side is connected with pedestal, and pedestal is cylindrical in shape, and one end is connected with flange, and the other end is
Free end, the center line of pedestal are overlapped with the center line of flange, and expansion piston pipe is straight tube, and one end is connected with disk, the other end
For connecting the pulse tube of refrigeration machine there is cylindrical heat exchange chamber and cylindrical expansion to live in expansion piston pipe for free end
Chamber is filled in, heat exchange chamber is connected to pulse tube, pulse tube, heat exchange chamber and expansion piston chamber coaxial line and is connected, compression piston
Pipe is straight tube, and in the base, one end is connected with flange for setting, and the other end is free end, has compression cylinder in compression piston pipe
Plunger shaft, compression piston chamber and expansion piston chamber coaxial line and is connected, and is parallel to compression piston cavity axis, is provided on disk
Multiple connection compression piston chambers and external through-hole, the internal diameter of compression piston chamber are greater than the internal diameter of expansion piston chamber, expansion piston
The internal diameter of chamber is greater than the internal diameter of heat exchange chamber, and the internal diameter of heat exchange chamber and the internal diameter of pulse tube are identical, and level-one hot end heat exchanger is in
Cylindrical shape covers on the outer wall of expansion piston pipe and on the end face that roundel is arranged in, one end of pulse tube and expansion piston pipe
It is connected, the other end is connected with cool end heat exchanger, and regenerator is cylindrical, and the outside of pulse tube is arranged in, and one end and cold end exchange heat
Device is connected, and the other end is connected with level-one hot end heat exchanger, and for expansion piston in expansion piston pipe, expansion piston spring passes through connection
Part is fixedly connected with rack, and one end of expansion piston bar is connected with expansion piston, and the other end is connected with expansion piston spring, compression
Piston, expansion piston, compression piston chamber and expansion piston chamber constitute compression chamber.
The utility model provides a kind of pulse type free-piston Stirling cooler, has the feature that, including swollen
Swollen machine unit, expanding machine unit are above-mentioned expanding machine unit.
In addition, in pulse type free-piston Stirling cooler provided by the utility model, which is characterized in that further include
Second level hot end heat exchanger is arranged in heat exchange chamber, expansion piston, second level hot end heat exchanger, heat exchange chamber and expansion piston
Chamber constitutes expansion chamber, and expansion chamber is coaxially arranged with compression chamber.
In addition, in pulse type free-piston Stirling cooler provided by the utility model, which is characterized in that further include
The air deflector that pulse tube one end is set and is located in pulse tube.
In addition, in pulse type free-piston Stirling cooler provided by the utility model, which is characterized in that further include
The shell of Shelf External and the cold finger shell being arranged in outside expanding machine unit are set.
In addition, in pulse type free-piston Stirling cooler provided by the utility model, which is characterized in that further include
Outside positioned at level-one hot end heat exchanger and the radiator that is arranged on cold finger shell.
In addition, in pulse type free-piston Stirling cooler provided by the utility model, it is characterised in that: wherein,
Regenerator is cylindrical in shape, and is made of polyester film.
In addition, in pulse type free-piston Stirling cooler provided by the utility model, it is characterised in that: in cold end
Heat exchanger and regenerator are additionally provided with the first filtering layer, and the first filtering layer is cylindrical in shape, is made of stainless steel cloth.
In addition, in pulse type free-piston Stirling cooler provided by the utility model, it is characterised in that: and
Hot end heat exchanger and cool end heat exchanger are additionally provided with the second filtering layer, and the second filtering layer is cylindrical in shape, is made of steeping wool.
The action and effect of utility model
The coaxial pulse-tube type free-piston Stirling cooler according to involved in the utility model, including driving unit, pressure
Contracting unit, expanding machine unit.
The coaxial pulse-tube type free-piston Stirling cooler of the utility model eliminates traditional free piston stirling system
The longer low-temperature expansion piston of cold is replaced with shorter room-temperature zone work work recycling expansion piston.Free piston stirling system
The expansion cylinder of cold becomes the pulse tube of vascular cold finger, and pulse tube cold end is disposed with the air deflector of laminarization, and hot end is equipped with
Second level hot end heat exchanger.The advantages of this change combines free-piston Stirling cooler and vascular refrigerator, passes through cancellation
In the expansion piston of hot and cold side high frequency motion, low-temperature expansion piston bring pumping loss is eliminated, shuttle is lost and axial
Conductive heat loss.Shorter swell at room temperature piston is set by hot end and solves the problems, such as the acoustic power recovery of vascular refrigerator, therefore, when
When recycling cold end sound function completely, which is Carnot's cycle efficiency.Together
When, cancelling low-temperature expansion piston reduces refrigeration machine manufacture difficulty, reduces overall mass.
Detailed description of the invention
Fig. 1 is pulse type free-piston Stirling cooler diagrammatic cross-section in the embodiments of the present invention one；
Fig. 2 is the stereoscopic schematic diagram of rack in the embodiments of the present invention；
Fig. 3 is A direction view in Fig. 2；
Fig. 4 is C-C cross-sectional view in Fig. 3；
Fig. 5 is the perspective cross-sectional schematic diagram of rack in the embodiments of the present invention one；
Fig. 6 is pulse type free-piston Stirling cooler diagrammatic cross-section in the embodiments of the present invention two；
Fig. 7 is the stereoscopic schematic diagram of rack in the embodiments of the present invention two；
Fig. 8 is B direction view in Fig. 7；
Fig. 9 is D-D cross-sectional view in Fig. 8；
Figure 10 is integrated open frame schematic cross-sectional view in example IV；
Figure 11 is integrated open frame schematic cross-sectional view in embodiment five；
Figure 12 is pulse type free-piston Stirling cooler diagrammatic cross-section in the embodiments of the present invention six；
Figure 13 is the perspective cross-sectional schematic diagram of rack in the embodiments of the present invention six；
Figure 14 is the schematic cross-sectional view of rack in the embodiments of the present invention；And
Figure 15 is that the pulse type free piston stirling in the embodiments of the present invention with segmented regenerator freezes
Machine diagrammatic cross-section.
Specific embodiment
In order to be easy to understand the technical means, creative features, achievement of purpose, and effectiveness of the utility model, with
Lower embodiment combination attached drawing is specifically addressed the coaxial pulse-tube type free-piston Stirling cooler of the utility model.
Embodiment one
As shown in Figure 1, coaxial pulse-tube type free-piston Stirling cooler includes linear motor 1, compression unit, expanding 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, the shape in disk form of flange 52, 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 is overlapped, and is provided with multiple connecting screw holes 531 on the free end of pedestal 53, in embodiment, pedestal 53 be around
Four supporting legs of the center line setting of flange 52.
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.
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 is arranged in gap, and 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 mainly includes 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, fixture 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 production of the materials such as steel disc, permanent magnet 13 are permanent-magnet material, commonly use 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 is arranged in gap on frame 50 and between outer yoke, interior yoke.
When coil is passed through direct current, outer yoke 11 and interior yoke 14 will form magnetic force loop line, thus in outer 11 He of yoke
Magnetic pole is generated on interior yoke 14.When being passed through alternating current in coil, permanent magnet 13 just will receive alternating electromagnetic force and do reciprocal
Linear motion.When permanent magnet 13 does linear reciprocating motion, it will drive compression piston 19 and 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, fixture nut 18, compression piston 19.Compression piston
Flat spring 17 is connected by fixture 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,
Second 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, covers on the outer wall of piston tube 51 and be arranged in the end face of roundel 521
On, level-one hot end heat exchanger 26 and rack 50 are separate structure, 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, and the outside of pulse tube 31, one end and cool end heat exchanger 24 is arranged in
It is connected, the other end is connected with level-one hot end heat exchanger 26.
Second level hot end heat exchanger 33 is arranged in pulse tube 31, positioned at the junction of pulse tube 31 and piston tube 51, second level
Hot end heat exchanger 33 and rack 50 are separate structure, the inner wall interference fit of second level hot end heat exchanger 33 and piston tube 51.
Expansion piston 21 is arranged in piston tube 51, and expansion piston flat spring 22 connects by the way that connector and rack 50 are fixed
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, second level hot end heat exchanger 33
And plunger shaft constitutes expansion chamber, expansion chamber is coaxially arranged with compression chamber.
The outside of level-one hot end heat exchanger 26, regenerator 25, cool end heat exchanger 24 is arranged in cold finger shell 35, and shell 60 is arranged
In rack 50 and the outside of expanding machine unit, shell 60, cold finger shell 35 and rack 50 are linked into an integrated entity by connector.
Undamped dynamic absorber unit 4 is connected with shell 60 and is arranged in the outside of shell 60, for carrying out to refrigeration machine
Damping.
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
As shown in fig. 7, coaxial pulse-tube type free-piston Stirling cooler includes linear motor 1, compression unit, expanding machine
Unit, undamped dynamic absorber unit 4, rack 50B and shell 60.
As shown in Figure 8,9, 10, rack 50B includes flange 52B, expansion piston pipe 51B, compression piston pipe 54B and pedestal
53B,
Wherein, flange 52B shape in disk form, the one side of flange 52B are provided with concentric disk 521B, another side
It is connected with pedestal 53B, multiple connection through-holes is evenly arranged on flange 52B.
Pedestal 53B is cylindrical in shape, and one end is connected with flange 52B, and the other end is free end, the center line and flange of pedestal 53B
The center line of 52B is overlapped, and is provided with multiple connecting screw hole 531B on the free end of pedestal 53B, and in embodiment, pedestal 53B is to enclose
Four supporting legs being arranged around the center line of flange 52B.
Expansion piston pipe 51B be straight pipe, one end be connected with disk 521B and with disk 521B coaxial line, the other end be oneself
By holding, for connecting the pulse tube of refrigeration machine, there is cylindrical expansion plunger shaft 511B in expansion piston pipe 51B.
Compression piston pipe 54B is straight pipe, is arranged in pedestal 53B, and one end is connected and same with flange 52B with flange 52B
Axis, the other end are free end, have compression cylinder plunger shaft 541B in compression piston pipe 54B, compression piston chamber 541B with it is swollen
Swollen plunger shaft 511B coaxial line and it is connected.
It is parallel to compression piston chamber 541B axis, multiple connection compression piston chamber 541B and outside are provided on disk 521B
Through-hole 522B, the quantity of through-hole 522B is between 3-9.In embodiment, the section of through-hole 522B is arc groove, quantity 4
It is a.
The internal diameter of compression piston chamber 541B is greater than the internal diameter of expansion piston chamber 511B, the internal diameter and arteries and veins of expansion piston chamber 511B
The internal diameter of washing pipe is identical.
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 is arranged in gap, and mover includes permanent magnet 13 and permanent magnetism body support frame on frame and between outer yoke, interior yoke
15。
As shown in fig. 7, linear motor 1 mainly includes 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, fixture 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 production of the materials such as steel disc, permanent magnet 13 are permanent-magnet material, commonly use 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 is arranged in gap on frame 50B and between outer yoke, interior yoke.
When coil is passed through direct current, outer yoke 11 and interior yoke 14 will form magnetic force loop line, thus in outer 11 He of yoke
Magnetic pole is generated on interior yoke 14.When being passed through alternating current in coil, permanent magnet 13 just will receive alternating electromagnetic force and do reciprocal
Linear motion.When permanent magnet 13 does linear reciprocating motion, it will drive compression piston 19 and 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, fixture nut 18, compression piston 19.Compression piston
Flat spring 17 is connected by fixture nut 18 with connector 16, and compression piston flat spring 17 and rack 50B are solid by connector
Fixed connection, compression piston 19 are arranged in compression piston chamber 541B, and one end is connected with mover and is connected with compression piston spring 17,
The other end is free end.
Expanding machine unit includes expansion piston 21B, expansion piston flat spring 22B, piston rod 23B, level-one hot end heat exchanger
26B, second level hot end heat exchanger 33B, regenerator 25B, pulse tube 31B, cool end heat exchanger 24B, cold finger shell 35B.
Level-one hot end heat exchanger 26B is cylindrical, covers on the outer wall of expansion piston pipe 51B and is arranged in roundel 521B
End face on, level-one hot end heat exchanger 26B and rack 50B are separate structure, level-one hot end heat exchanger 26B and piston tube 51B's
Outer wall interference fit.
One end of pulse tube 31B is connected with one end of expansion piston pipe 51B, and the other end is connected with cool end heat exchanger 24B.
Regenerator 25B is in the cylindrical shape of ring-shaped section and ring-shaped, and the outside of pulse tube 31B, one end and cool end heat exchanger is arranged in
24B is connected, and the other end is connected with level-one hot end heat exchanger 26B.Regenerator 25B uses polyester film, nylon and polytetrafluoro
Any one in vinyl material is made, and regenerator 25B is used and is made of polyester film in embodiment.
Second level hot end heat exchanger 33B is arranged in pulse tube 31B, positioned at the connection of pulse tube 31B and expansion piston pipe 51B
Place, second level hot end heat exchanger 33B and rack 50B are separate structure, and second level hot end heat exchanger 33B is interior with expansion piston pipe 51B's
Wall interference fit.
Expansion piston 21B is arranged in expansion piston pipe 51B, and expansion piston flat spring 22B passes through connector and rack 50B
It is fixedly connected, one end of piston rod 23B is connected with expansion piston 21B, and the other end passes through compression piston 19, compression piston flat spring
It is connected after 17 with expansion piston flat spring 22B,
Compression piston 19, expansion piston 21B, compression piston chamber 541B and expansion piston chamber 511B constitute compression chamber.
Expansion piston 21B, second level hot end heat exchanger 33B and expansion piston chamber 511B constitute expansion chamber.Expansion chamber and pressure
Contracting chamber is coaxially arranged.
The outside of level-one hot end heat exchanger 26B, regenerator 25B, cool end heat exchanger 24B, shell 60 is arranged in cold finger shell 35B
The outside of rack 50B and expanding machine unit are set, and shell 60, cold finger shell 35B and rack 50B connect into one by connector
Body.
Radiator 27 is located at the outside of level-one hot end heat exchanger 26B and is arranged on cold finger shell 35B, level-one hot end heat exchanger
Heat is passed to the radiator 27 in outside by 26B by cold finger shell 35B, 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 carrying out to refrigeration machine
Damping.
The present embodiment be suitable for 120K~220K (- 153 DEG C~-53 DEG C) cryogenic temperature section, can provide 20W~
The refrigerating capacity of 50W.
Embodiment three
The present embodiment other structures are identical as embodiment two, the difference is that further including being arranged in the one end pulse tube 31B and position
In the air deflector 32B in pulse tube 31B, air deflector 32B is connected with cool end heat exchanger 24B.
Example IV
The present embodiment other structures are identical as embodiment two, the difference is that second level hot end heat exchanger 33B1 and rack 50B is
Integral structure.As shown in Figure 10, in embodiment, second level hot end heat exchanger 33B1 is integrally made using aluminium with rack 50B
50B1。
The integral structure of second level hot end heat exchanger 33B1 and rack 50B effectively eliminate second level hot end heat exchanger 33B1 with
Thermal contact resistance between rack 50B, meanwhile, second level hot end heat exchanger 33B1 can also play the role of air deflector.
Embodiment five
The present embodiment other structures are identical as example IV, the difference is that level-one hot end heat exchanger 26B2 and rack 50B is
Integral structure.As shown in figure 11, in embodiment, level-one hot end heat exchanger 26B2, second level hot end heat exchanger 33B1 and rack 50B
It is whole to be made 50B2 using aluminium.
The integral structure of level-one hot end heat exchanger 26B2, second level hot end heat exchanger 33B1 and rack 50B1 are effectively eliminated
Thermal contact resistance between level-one hot end heat exchanger 26B2, second level hot end heat exchanger 33B1 and rack 50B, meanwhile, second level hot end
Heat exchanger 33B1 can also play the role of air deflector.
Embodiment six
As shown in figure 12, coaxial pulse-tube type free-piston Stirling cooler includes linear motor 1, compression unit, expansion
Machine unit, undamped dynamic absorber unit 4, rack 50C and shell 60.
As shown in Figure 13,14, rack 50C includes flange 52C, expansion piston pipe 51C, compression piston pipe 54C and pedestal
53C,
Wherein, flange 52C shape in disk form, the one side of flange 52C are provided with concentric disk 521C, another side
It is connected with pedestal 53C, multiple connection through-holes is evenly arranged on flange 52C.
Pedestal 53C is cylindrical in shape, and one end is connected with flange 52C, and the other end is free end, the center line and flange of pedestal 53C
The center line of 52C is overlapped, and is provided with multiple connecting screw hole 531C on the free end of pedestal 53C, and in embodiment, pedestal 53C is to enclose
Around four supporting legs of the setting of flange 52C center line.
Expansion piston pipe 51C be straight tube, one end be connected with disk 521C and with disk 521C coaxial line, the other end be freedom
End, for connecting the pulse tube of refrigeration machine, there is 51C cylindrical heat exchange chamber 511C and cylindrical expansion to live in expansion piston pipe
Fill in chamber 512C, heat exchange chamber 511C be connected to pulse tube, pulse tube, heat exchange chamber 511C and expansion piston chamber 512C coaxial line and
It is connected, compression piston pipe 54C is straight tube, is arranged in pedestal 53C, one end is connected with flange 52C to be arranged in flange 52C
The heart, the other end are free end, have compression cylinder plunger shaft 541C, compression piston chamber 541C and expansion in compression piston pipe 54C
Plunger shaft 512C coaxial line and it is connected.
It is parallel to compression piston chamber 541C axis, multiple connection compression piston chamber 541C are provided on disk and are led to external
The quantity of hole 522C, through-hole 522C are between 3-9, and in embodiment, the section of through-hole 522C is arc groove, and quantity is 4.
The internal diameter of compression piston chamber 541C is greater than the internal diameter of expansion piston chamber 512C, and the internal diameter of expansion piston chamber 512C is greater than
The internal diameter of heat exchange chamber 511C, the internal diameter of heat exchange chamber 511C and the internal diameter of pulse tube are identical.
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 is arranged in gap, and mover includes permanent magnet 13 and permanent magnetism body support frame on frame and between outer yoke, interior yoke
15。
As shown in fig. 7, linear motor 1 mainly includes 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, fixture 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 production of the materials such as steel disc, permanent magnet 13 are permanent-magnet material, commonly use 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 is arranged in gap on frame 50C and between outer yoke, interior yoke.
When coil is passed through direct current, outer yoke 11 and interior yoke 14 will form magnetic force loop line, thus in outer 11 He of yoke
Magnetic pole is generated on interior yoke 14.When being passed through alternating current in coil, permanent magnet 13 just will receive alternating electromagnetic force and do reciprocal
Linear motion.When permanent magnet 13 does linear reciprocating motion, it will drive compression piston 19 and 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, fixture nut 18, compression piston 19.Compression piston
Flat spring 17 is connected by fixture nut 18 with connector 16, and compression piston flat spring 17 and rack 50C are solid by connector
Fixed connection, compression piston 19 are arranged in compression piston chamber 541C, and one end is connected with mover and is connected with compression piston spring 17,
The other end is free end.
Expanding machine unit includes expansion piston 21C, expansion piston flat spring 22C, piston rod 23C, level-one hot end heat exchanger
26C, second level hot end heat exchanger 33C, regenerator 25C, pulse tube 31C, cool end heat exchanger 24C, cold finger shell 35C.
Level-one hot end heat exchanger 26C is cylindrical, covers on the outer wall of expansion piston pipe 51C and is arranged in roundel 521C
End face on, level-one hot end heat exchanger 26C and rack 50C are separate structure, level-one hot end heat exchanger 26C and expansion piston pipe
The outer wall of 51C is interference fitted.
One end of pulse tube 31C is connected with one end of expansion piston pipe 51C, and the other end is connected with cool end heat exchanger 24C, cold
The end of cold finger shell 35C is arranged in end heat exchanger 24C.
Regenerator 25C is in the cylindrical shape of ring-shaped section and ring-shaped, and the outside of pulse tube 31C, one end and cool end heat exchanger is arranged in
24C is connected, and the other end is connected with level-one hot end heat exchanger 26C.Regenerator 25C uses polyester film, nylon and polytetrafluoro
Any one in vinyl material is made, and regenerator 25C is used and is made of polyester film in embodiment.
Second level hot end heat exchanger 33C is arranged in heat exchange chamber 511C, positioned at pulse tube 31C's and expansion piston pipe 51C
Junction, second level hot end heat exchanger 33C and rack 50C are separate structure, second level hot end heat exchanger 33C and expansion piston pipe 51C
Inner wall interference fit.
Expansion piston 21C is arranged in expansion piston chamber 512C, and expansion piston flat spring 22C passes through connector and rack
50C is fixedly connected, and one end of piston rod 23C is connected with expansion piston 21C, and the other end passes through compression piston 19, compression piston plate
It is connected after spring 17 with expansion piston flat spring 22C.
Compression piston 19, expansion piston 21C, compression piston chamber 541C and expansion piston chamber 512C constitute compression chamber, swollen
Swollen piston 21C, second level hot end heat exchanger 33C, expansion piston chamber 512C and heat exchange chamber 511C constitute expansion chamber, compression chamber with
Expansion chamber coaxial arrangement.
The outside of level-one hot end heat exchanger 26C, regenerator 25C, cool end heat exchanger 24C, shell 60 is arranged in cold finger shell 35C
The outside of rack 50C and expanding machine unit are set, and shell 60, cold finger shell 35C and rack 50C connect into one by connector
Body.
Radiator 27 is located at the outside of level-one hot end heat exchanger 26C and is arranged on cold finger shell 35C, level-one hot end heat exchanger
Heat is passed to the radiator 27 in outside by 26C by cold finger shell 35C, 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 carrying out to refrigeration machine
Damping.
The motion process and gas flow of expansion piston and compression piston:
Expansion piston flat spring 22C is fixed with piston rod 23C, and expansion piston 21C is connected with piston rod 23C.
Expansion piston 21C is pure pneumatic actuation, is produced using the displacement phase difference between expansion piston 21C and compression piston 19
Raw refrigeration effect, about 70 °~100 ° of the leading compression piston 19 of the displacement of usual expansion piston 21C, in low-temperature space (cold head temperature
At -153 DEG C or less) when, displacement phase difference can be decreased to 50 °~60 °.Since linear motor is sinusoidal ac excitation, so
The movement of expansion piston 21C and compression piston 19 be also in sinusoidal continuous movement, it is false but in order to illustrate its working principle
If expansion piston 21C and compression piston 19 do the movement of intermittent touchdown formula 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 29C in sound wave compressed, and flow into the level-one hot end heat exchanger 26C on the outside of cylinder, compression process generated
Heat be released to level-one hot end heat exchanger 26C, heat is passed to outside by outer housing again by level-one hot end heat exchanger 26C
Radiator 27, is finally released to environment.Ideally think cylinder and outer housing is completely thermally conductive, while level-one hot end is changed
The heat exchange area of hot device 26C and radiator 27 is infinitely great, therefore the temperature of working medium remains unchanged.But in the actual process, isothermal
Compression is impossible, and expansion piston 21C is it is not possible that intermittent movement, expands when compression piston 19 moves upwards and live
Plug 21C, which has begun, to be moved downward.
Regenerator exothermic process: compression piston 19 moves to motionless after top dead centre, and expansion piston 21C is moved downward, at this time
Sound wave comes into full contact with heat exchange by the filler in regenerator 25C, with regenerator 25C, and heat is discharged to regenerator 25C, this
When regenerator 25C temperature increase, acoustic wave temperature and pressure reduction.But in practical heat transfer process, regenerator 25C heat transfer process
It is not constant volume, it is also not possible to the complete heat exchange of real sound wave and regenerator 25C filler.
Sound wave Laminar Flow process: gas is flowed through by air deflector 32C after cool end heat exchanger 24C, as a laminar flow into
Enter pulse tube 31C, gas in pulse tube 31C is pushed to expansion chamber 28C.After gas is squeezed, pressure and temperature rises.It generates
Heat is radially transferred to level-one hot end heat exchanger 26C by second level hot end heat exchanger 33C, is finally transmitted to radiator 27 and releases
It puts to environment.Gas expansion for doing work in expansion chamber 28C, auxiliary pushing expansion piston recycle compression chamber 34C to lower dead center, function
Become smaller, plays the role of recycling sound function.In practical work process, compression piston 19 can't rest on always top dead centre,
But it can be moved downwardly together with expansion piston 21C, but it need to be pointed out that the two is not movement in the same direction but expansion piston neck
The certain phase angle of first compression piston.
Sound wave process of refrigerastion: expansion piston 21C moves up to top dead centre since lower dead center, and compression piston 19 moves to
Lower dead center, expansion piston 21C push back to the sound wave in expansion chamber 28C in pulse tube 31C, and gas expands suction in pulse tube
Heat generates refrigeration effect, reaches lowest refrigerating temperature at air deflector 32C at the top of pulse tube 31C.The cooling capacity of generation passes through
Cool end heat exchanger 24C is exported to cold environment.Sound wave working medium is returned in regenerator 25C along original route again and is come into full contact with filler
Heat exchange after absorbing the heat in regenerator 25C, returns to main compression chamber 29C and waits next second compression.The temperature of the process sound wave
Degree and pressure rise, the decline of regenerator 25C temperature.In the actual process, expansion piston 21C when compression piston 19 reaches lower dead center
And not up to top dead centre, but during returning to top dead centre, but its still advanced compression piston 19 on displacement wave phase.
The present embodiment is suitable for 120K (- 153 DEG C of cryogenic temperatures below), can provide the refrigerating capacity of 2W~20W.
Gas flow detailed description:
As shown in Figure 1, when compression piston (19) is moved to top dead centre, by the gas in compression chamber (29) from base
Exhaust passage is pressed into first-class heat exchanger (26), after the heat that compression process generates is released to first-class heat exchanger (26), gas work
Matter is continued up along axial direction flows through regenerator, and temperature reduces after rejecting heat to regenerator, flows through cool end heat exchanger
(24) enter pulse tube (31) as a laminar flow by air deflector (32) afterwards to move axially downwards, pulse tube (31) interior gas
Body pushes expansion chamber (28) to.After gas is squeezed, pressure and temperature rises.The heat of generation is by secondary heat exchanger (33) along diameter
To first-class heat exchanger (26) are transferred to, it is finally transmitted to radiator (27) and is released to environment.After gas reaches expansion chamber (28)
Expansion work pushes expansion piston to down toward a movement.When expansion piston (21) moves to after bottom dead center, then in spring force
It is moved under effect to top dead centre, the gas in expansion chamber (28) is pushed back into pulse tube.Gas swelling heat absorption in pulse tube produces
Raw refrigeration effect reaches lowest refrigerating temperature at air deflector (32) at the top of pulse tube (31).Hereafter gas flows through cold end
Turn again to regenerator after heat exchanger, absorb the heat of regenerator, along axial direction continue to travel downward through hot end heat exchanger after again
Compression chamber waiting is returned to be compressed next time.
As shown in figure 9, multiple on second of rack 50B in embodiment two, to open axial waist-shaped hole 522B logical as air inlet
Road, compared to multiple radial holes are opened in embodiment one in the first rack 50, axial waist-shaped hole can be passed in and out to avoid gas and be pressed
Flow direction has 90 ° of rotation when contracting chamber.It is greatly reduced the flow resistance loss of gas working medium, promotes the refrigeration performance of refrigeration machine.Together
When, due to not needing 90 ° of rotation when gas passes in and out compression chamber, gas can be made with biggish flow velocity by regenerator, according to convection current
For the heat transfer theory of heat exchange it is found that flow velocity is bigger, the surface coefficient of heat transfer of gas-solid heat exchange is bigger, to enhance the backheat of regenerator
Effect reduces the regenerative losses of regenerator, promotes the refrigeration performance of refrigeration machine.Preferably, the sectional area of 522B accounts for about entirely
The 40%~60% of small rotary table 521B sectional area.
Comparing embodiment one, embodiment two, three kinds of refrigeration machines in embodiment six application.
As shown in Fig. 1,6,12, embodiment one, embodiment two, three kinds of refrigeration machines in embodiment six are respectively corresponded as refrigeration
Machine I, refrigeration machine II, refrigeration machine III.
Pulse type sterlin refrigerator compression piston surface PV function < WPV>=P0AcXcπ fsin (θ) wherein P0 when pressure wave
Amplitude, Ac are the sectional area of compression piston, Xc is compression piston stroke, f is running frequency, θ be compression piston displacement it is advanced
The phase angle of compression chamber pressure wave.Compression piston sectional area Ac is bigger it can be seen from above-mentioned formula, defeated under identical Xc stroke
It is bigger to enter function.
Pulse type sterlin refrigerator expansion piston surface PV function < WPV>=P0AeXeπ fsin (φ) wherein P0 when pressure
Wave amplitude, Ae are the sectional area of expansion piston, Xe is expansion piston stroke, f is running frequency, φ is that expansion piston compresses in advance
The displacement phase angle of piston.Expansion piston sectional area Ae is bigger it can be seen from above-mentioned formula, and expansion piston surface PV function is got over
Greatly, refrigeration mechanism cooling capacity increases.
The compression piston outer diameter of refrigeration machine I, II, III are identical, so under identical compression piston stroke, the input of motor
Function is identical.Under identical input work, compare the applicable situation of three kinds of refrigeration machines.
The expansion piston outer diameter of refrigeration machine I is identical as vascular internal diameter, expansion piston largest outside diameter, has biggish PV function,
So refrigerating capacity is larger.But vascular internal diameter is larger so cryogenic temperature is higher.Suitable for high-temperature region (- 53 DEG C or more) High cooling power
The occasion of (50W~200W).
The expansion piston outer diameter of refrigeration machine II is identical as vascular internal diameter, but respectively less than refrigeration machine I.So refrigeration machine II's is swollen
Swollen piston PV function is less than refrigeration machine I, so refrigerating capacity is less than refrigeration machine I.But vascular internal diameter is less than refrigeration machine I, so refrigeration temperature
Degree is lower than refrigeration machine I.The occasion of cooling capacity suitable for middle warm area (- 153 DEG C~-53 DEG C).
The expansion piston outer diameter of refrigeration machine III is greater than vascular internal diameter, the expansion piston outer diameter and refrigeration machine II of refrigeration machine III
It is identical, but vascular internal diameter is less than refrigeration machine II, and lesser vascular internal diameter easily obtains lower cryogenic temperature.So refrigeration machine III
Occasion suitable for low-temperature space (being lower than -153 DEG C) small cooling capacity (being less than 20W).
Embodiment seven
The present embodiment other structures are identical as embodiment three, the difference is that between cool end heat exchanger 24C and regenerator 25C
It is additionally 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
It is 20-50 μm, in embodiment, the string diameter of stainless steel wire is 30 μm.Pressure drop is small when helium passes through the stainless steel wire layer, stainless steel wire
Layer has cold-storage ability strong, the strong feature of mobility.
Embodiment eight
The present embodiment other structures are identical as example IV, unlike and hot end heat exchanger 26C and regenerator 25C
It is additionally provided with the second filtering layer, the second filtering layer is in the tubular of ring-shaped section and ring-shaped, is made of steeping wool.The string diameter of wool is 10-
30 μm, in embodiment, the string diameter of wool is 20 μm.Wool layer has the characteristics of buffering assembly, adjustment assembly size.
As shown in figure 15, 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 nine
The present embodiment other structures are identical as embodiment six, the difference is that second level hot end heat exchanger 33C and rack 50C are one
Body structure.In embodiment, second level hot end heat exchanger 33C is integrally made using aluminium with rack 50C.
Second level hot end heat exchanger and the integral structure of rack effectively eliminate second level hot end heat exchanger 33C and rack 50C
Between thermal contact resistance, meanwhile, second level hot end heat exchanger 33C can also play the role of air deflector.
Embodiment ten
The present embodiment other structures are identical as embodiment nine, the difference is that level-one hot end heat exchanger 26C and rack 50C are one
Body structure.In embodiment, level-one hot end heat exchanger 26C, second level hot end heat exchanger 33C and rack 50C integrally use aluminum to make
It forms.
The integral structure of level-one hot end heat exchanger 26C, second level hot end heat exchanger 33C and rack 50C effectively eliminate
Thermal contact resistance between level-one hot end heat exchanger 26C, second level hot end heat exchanger 33C and rack 50C, meanwhile, the heat exchange of second level hot end
Device 33C can also play the role of air deflector.
The action and 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 end is equipped with second 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 low-temperature expansion piston bring pumping loss, shuttle loss and axial thermal conductivity damage
It loses.Shorter swell at room temperature piston is set by hot end and solves the problems, such as the acoustic power recovery of vascular refrigerator, therefore, when returning completely
When receiving cold end sound function, which is Carnot's cycle efficiency.Meanwhile cancelling
Low-temperature expansion piston reduces refrigeration machine manufacture difficulty, reduces overall mass.
Above embodiment is the preferred case of the utility model, is not intended to limit the protection scope of the utility model.
Claims (9)
1. a kind of expanding machine unit, is arranged on the rack characterized by comprising
Expansion piston, expansion piston spring, expansion piston bar, level-one hot end heat exchanger, second level hot end heat exchanger, regenerator, arteries and veins
Washing pipe and cool end heat exchanger,
Wherein, the rack includes flange, expansion piston pipe, compression piston pipe and pedestal,
The flange shape in disk form, the one side of the flange are provided with concentric disk, and another side is connected with the pedestal,
The pedestal is cylindrical in shape, and one end is connected with flange, and the other end is free end, the center line of the pedestal and the flange
Center line is overlapped,
The expansion piston pipe is straight tube, and one end is connected with the disk, and the other end is free end, for connecting the arteries and veins of refrigeration machine
Washing pipe, the expansion piston pipe is interior to have cylindrical heat exchange chamber and cylindrical expansion piston chamber, and the heat exchange chamber is connected to institute
It states pulse tube, the pulse tube, the heat exchange chamber and the expansion piston chamber coaxial line and is connected, the compression piston
Pipe is straight tube, is arranged in the pedestal, one end is connected with the flange, and the other end is free end, in the compression piston pipe
With compression cylinder plunger shaft, the compression piston chamber and the expansion piston chamber coaxial line and it is connected,
It is parallel to the compression piston cavity axis, multiple connection compression piston chambers are provided on the disk and are led to external
Hole,
The internal diameter of the compression piston chamber is greater than the internal diameter of the expansion piston chamber, and the internal diameter of the expansion piston chamber is greater than described
The internal diameter of heat exchange chamber, the internal diameter of the heat exchange chamber is identical as the internal diameter of the pulse tube,
The level-one hot end heat exchanger is cylindrical, covers on the outer wall of the expansion piston pipe and be arranged in the end of the disk
On face,
One end of the pulse tube is connected with the expansion piston pipe, and the other end is connected with the cool end heat exchanger,
The regenerator is cylindrical, and the outside of the pulse tube is arranged in, and one end is connected with the cool end heat exchanger, the other end
It is connected with the level-one hot end heat exchanger,
In the expansion piston pipe, the expansion piston spring connects the expansion piston by the way that connector and the rack are fixed
It connecing, one end of the expansion piston bar is connected with the expansion piston, and the other end is connected with the expansion piston spring,
The compression piston, the expansion piston, the compression piston chamber and the expansion piston chamber constitute compression chamber.
2. a kind of pulse type free-piston Stirling cooler characterized by comprising
Expanding machine unit, the expanding machine unit are expanding machine unit described in claim 1.
3. pulse type free-piston Stirling cooler according to claim 2, which is characterized in that further include:
Second level hot end heat exchanger is arranged in the heat exchange chamber, the expansion piston, the second level hot end heat exchanger, described
Heat exchange chamber and the expansion piston chamber constitute expansion chamber, and the expansion chamber and the compression chamber are coaxially arranged.
4. pulse type free-piston Stirling cooler according to claim 2, which is characterized in that further include:
The air deflector that described pulse tube one end is set and is located in the pulse tube.
5. pulse type free-piston Stirling cooler according to claim 2, which is characterized in that further include:
The shell of the Shelf External and the cold finger shell being arranged in outside the expanding machine unit are set.
6. pulse type free-piston Stirling cooler according to claim 5, which is characterized in that further include:
Outside positioned at the level-one hot end heat exchanger and the radiator that is arranged on the cold finger shell.
7. pulse type free-piston Stirling cooler according to claim 2, it is characterised in that:
Wherein, the regenerator is cylindrical in shape, and is made of polyester film.
8. pulse type free-piston Stirling cooler according to claim 2, it is characterised in that:
It is additionally provided with the first filtering layer in the cool end heat exchanger and the regenerator, first filtering layer is cylindrical in shape, and use is stainless
Steel wire is made.
9. pulse type free-piston Stirling cooler according to claim 2, it is characterised in that:
It is additionally provided with the second filtering layer in described and hot end heat exchanger and the cool end heat exchanger, second filtering layer is cylindrical in shape,
It is made of steeping wool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820685253.0U CN208520037U (en) | 2018-05-09 | 2018-05-09 | A kind of expanding machine unit and pulse type free-piston Stirling cooler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820685253.0U CN208520037U (en) | 2018-05-09 | 2018-05-09 | A kind of expanding machine unit and pulse type free-piston Stirling cooler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208520037U true CN208520037U (en) | 2019-02-19 |
Family
ID=65341353
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820685253.0U Expired - Fee Related CN208520037U (en) | 2018-05-09 | 2018-05-09 | A kind of expanding machine unit and pulse type free-piston Stirling cooler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208520037U (en) |
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2018
- 2018-05-09 CN CN201820685253.0U patent/CN208520037U/en not_active Expired - Fee Related
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