CN103196254A - Cryogenic refrigerator and displacer - Google Patents
Cryogenic refrigerator and displacer Download PDFInfo
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- CN103196254A CN103196254A CN2013100030229A CN201310003022A CN103196254A CN 103196254 A CN103196254 A CN 103196254A CN 2013100030229 A CN2013100030229 A CN 2013100030229A CN 201310003022 A CN201310003022 A CN 201310003022A CN 103196254 A CN103196254 A CN 103196254A
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- displacer
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- low temperature
- conduction part
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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
Abstract
The invention provides a cryogenic refrigerator and a displacer which can effectively fully ensure the real heat exchange area. The cryogenic refrigerator (1) includes the displacer (2) including a body part (2a) and a heat conducting part (2b), wherein the material of the heat conducting part has a higher thermal conductivity than the body part; a cylinder (4) accommodating the displacer (2) in such a manner as to allow the displacer (2) to reciprocate in the axial directions of the cylinder (4), wherein an expansion space (3) is formed between the cylinder (4) and a low temperature end of the displacer (2); a clearance channel (C) formed between the displacer (2) and the cylinder (4) so as to allow a refrigerant gas to flow into the expansion space (3); and a cooling stage (5) positioned adjacent to the expansion space (3). The heat conducting part (2b) faces the cooling stage (5) across the clearance channel (C).
Description
Technical field
The present invention relates to a kind of ultra-low temperature refrigerating device and be used for the displacer (interchanger) of ultra-low temperature refrigerating device, this ultra-low temperature refrigerating device utilizes the higher pressure refrigerant gas of being supplied with by compression set, makes it produce circulation adiabatic expansion and produces cold of ultralow temperature.
Background technology
The device of putting down in writing in the patent documentation 1 is for example arranged as ultra-low temperature refrigerating device.This ultra-low temperature refrigerating device make displacer cylinder interior come and go mobile in, the switching by valve is expanded the refrigerant gas in the expansion space and is produced cold.Refrigerant gas passes the gap between displacer and the cylinder body and supplies with and be discharged to the expansion space.Cold of the refrigerant gas that produces in the expansion space is carried out the refrigeration of the cooled object that is connected with cooling bench by cooling bench and the heat exchange of refrigerant gas, wherein, this cooling bench is positioned at the outer circumferential side of gap and expansion space.
Patent documentation 1: TOHKEMY 2011-17457 communique
Yet, in the patent documentation 1 in the technology of record, the gas that passes the gap only and between the cooling bench of gap outer circumferential side, carry out heat exchange.Therefore, be difficult to fully guarantee the actual heat exchange area.
Summary of the invention
The object of the present invention is to provide a kind of ultra-low temperature refrigerating device and displacer, it can more effectively fully guarantee the actual heat exchange area.
In order to address the above problem,, it is characterized in that possessing: displacer based on ultra-low temperature refrigerating device of the present invention;
Cylinder body holds this displacer and makes this displacer can be along moving axially, and form the expansion space between the low-temperature end of described cylinder body and this displacer;
The gap stream is formed between described displacer and the described cylinder body, is used for making refrigerant gas be passed to described expansion space; And
Cooling bench is in and described expansion space position adjacent,
Described displacer comprises main part and heat-conduction part, and described heat-conduction part is made of the material that thermal conductivity is higher than this main part,
Described heat-conduction part is across described gap stream and opposed with described cooling bench.
At this, can be made as the linear expansion coefficient of described heat-conduction part less than described main part, also can be made as described heat-conduction part and have with respect to described main part overlapping overlapping portion on the stroke directions of described displacer, described main part has the superimposed portion corresponding with this overlapping.And, can be made as described heat-conduction part for bottom tube-like is arranged, also can be made as described heat-conduction part and be tubular and have in week and upwards constitute discontinuous slit.
And, can be made as described overlapping and described superimposed and constitute the threaded portion, also can be made as described overlapping portion and have the first hole portion, described superimposed portion has the second hole portion corresponding with the described first hole portion, and described main part is connected with described first both sides' of hole portion insertion parts by being inserted in this second hole portion with described heat-conduction part.In addition, can be made as described heat-conduction part is in copper, aluminium, the stainless steel any.
In addition, in order to solve above-mentioned problem, based on displacer of the present invention, have low-temperature end, it is characterized in that,
This displacer comprises: main part; And heat-conduction part, it is distolateral and be made of the material that thermal conductivity is higher than described main part to be positioned at described low temperature.At this, at normal temperatures, the external diameter of described heat-conduction part can be less with respect to the external diameter of described main part.
The invention effect
According to ultra-low temperature refrigerating device of the present invention and displacer, heat enters described heat-conduction part from described cooling bench through the gap of displacer outer circumferential side stream, described heat-conduction part transmits heat to the refrigerant gas that immerses the gap stream by expanding, can reduce the temperature difference of described cooling bench and increase the actual heat exchange area that helps heat exchange, thereby improve heat exchanger effectiveness.
Description of drawings
Fig. 1 is the schematic diagram of representing about an embodiment of the ultra-low temperature refrigerating device 1 of embodiment involved in the present invention 1 and displacer 2.
Fig. 2 is the schematic diagram of representing about an embodiment of the ultra-low temperature refrigerating device 2 of embodiment involved in the present invention 2 and displacer 22.
Fig. 3 is the schematic diagram of variation of the heat-conduction part 22b of the expression ultra-low temperature refrigerating device 1 of embodiment 2 and displacer 22.
Fig. 4 is the schematic diagram of variation of the heat-conduction part 22b of the expression ultra-low temperature refrigerating device 1 of embodiment 2 and displacer 22.
Fig. 5 is the schematic diagram of representing about an embodiment of the secondary formula ultra-low temperature refrigerating device 31 of embodiment involved in the present invention 3.
Among the figure: 1-ultra-low temperature refrigerating device, 2-displacer, 2a-main part, the superimposed portion of 2ab-, 2abh-the 2nd hole portion, 2b-heat-conduction part, the overlapping portion of 2ba-, 2bah-the 1st hole portion, the 3-expansion space, 4-cylinder body, 5-cooling bench, 6-pressure pin (insertion section), the 7-regenerator, 8-room temperature chamber, 9-rectifier, 10-rectifier, the 11-opening, 12-compressor, 13-supply valve, 14-returns valve, 15-seal, 16-opening.
The specific embodiment
Below, explanation is used for implementing mode of the present invention with reference to the accompanying drawings.
[embodiment 1]
The ultra-low temperature refrigerating device 1 of present embodiment 1 is for example for to utilize helium as Ji Fude-McMahon (GM) formula refrigeration machine of refrigerant gas.Ultra-low temperature refrigerating device 1 has: displacer 2; Cylinder body 4, and displacer 2 between form clearance C and expansion space 3; And the cooling bench 5 of round-ended cylinder shape arranged, be in adjacent with expansion space 3 and with the position of its outsourcing, displacer 2 comprises main part 2a and is higher than the heat-conduction part 2b that the material of main part 2a constitutes by thermal conductivity, and heat-conduction part 2b is across clearance C (gap stream) and opposed with cooling bench 5.Cooling bench 5 for example is made of copper, aluminium, stainless steel etc.
Wherein, the linear expansion coefficient of heat-conduction part 2b is less than main part 2a, and heat-conduction part 2b has overlapping overlapping the 2ba on the stroke directions of displacer 2 with respect to main part 2a, and main part 2a has and overlapping superimposed the 2ab that 2ba is corresponding.And in the present embodiment 1, heat-conduction part 2b is the cylindric of secondary shape, overlapping 2ba by among Fig. 1 from the 2nd grade of cylindric formation of beneath.
And overlapping 2ba has the 1st 2bah of hole portion, and superimposed 2ab has the 2nd hole portion 2abh corresponding with the 1st 2bah of hole portion.Main part 2a and heat-conduction part 2b are by being pressed into and inserting the 2nd 2abh of hole portion and the 1st 2bah both sides' of hole portion pressure pin 6(insertion section) be connected.Pressure pin 6 upwards is arranged at suitable position in week.About heat-conduction part 2b, use thermal conductivitys such as copper, aluminium, stainless steel for example at least greater than the material of main part 2a.Pressure pin 6 can be any in phenolic resins (phenolic aldehyde cloth), the stainless steel.By pressure pin 6 being pressed into the 1st 2bah of hole portion and the 2nd 2abh of hole portion makes overlapping 2ba be fixed in superimposed 2ab.
The temperature end of displacer 2 is provided with and comes and goes the not shown scotch yoke mechanism that drives displacer 2, and displacer 2 is mobile along axially coming and going of cylinder body 4.
Displacer 2 has outer peripheral face cylindraceous, and the inside of displacer 2 is filled with cool storage material.The internal capacity of this displacer 2 constitutes regenerator 7.The upper end side of regenerator 7 be room temperature chamber 8 sides arrange helium gas flow carried out rectification on side rectifier 9, in the lower end side of regenerator 7 side rectifier 10 down is set.
The temperature end of displacer 2 is formed with the opening 11 that makes refrigerant gas be passed to displacer 2 from room temperature chamber 8.Room temperature chamber 8 is spaces that the temperature end by cylinder body 4 and displacer 2 forms, and its volume changes along with the round movement of displacer 2.
Among making by compressor 12, supply valve 13 and returning the interconnected pipe arrangement of suction and discharge system that valve 14 constitutes, share pipe arrangement for row and be connected in room temperature chamber 8.And, between the part of leaning on temperature end partially of displacer 2 and the cylinder body 4 seal 15 is installed.
The low-temperature end of displacer 2 is formed with the opening 16 that refrigerant gas is imported expansion space 3 through clearance C.Expansion space 3 is the spaces that formed by cylinder body 4 and displacer 2, and its volume changes along with the round movement of displacer 2.The position corresponding with expansion space 3 in cylinder body 4 peripheries and bottom disposes thermally coupled in the cooling bench 5 of cooled object, and cooling bench 5 is by the refrigerant gas cooling of passing clearance C.
About the main part 2a of displacer 2, from viewpoints such as proportion, intensity, thermal conductivitys, use for example phenolic resins (phenolic aldehyde cloth) etc.Cool storage material is made of for example woven wire etc.In addition, Fig. 1 represents the operating state of ultra-low temperature refrigerating device 1.Therefore, because low temperature and along with the contraction slightly of main part 2a, both sides' external diameter becomes identical state, but under the normal temperature, the external diameter of heat-conduction part 2b is slightly smaller than the external diameter of main part 2a.
The action of refrigeration machine then, is described.In a certain moment of refrigerant gas supply operation, displacer 2 is positioned at the bottom dead centre of cylinder body 4.If meanwhile or the moment of staggering a little open supply valve 13, then high-pressure helium supplies in the cylinder body 4 from sharing pipe arrangement for row through supply valve 13, flows into the regenerator 7 of the inside of displacers 2 from the opening 11 on the top that is arranged in displacer 2.When the high-pressure helium that flows into regenerator 7 is cooled off by cool storage material, the opening 16 of the bottom through being positioned at displacer 2 and clearance C and supply to expansion space 3.
So, expansion space 3 is full of by high-pressure helium, and supply valve 13 is closed.At this moment, displacer 2 is positioned at the top dead-centre of cylinder body 4.If meanwhile or the moment of staggering a little open and return valve 14, then the refrigerant gas of expansion space 3 is depressurized, expands.The helium that becomes the expansion space 3 of low temperature by expansion absorbs the heat of cooling bench 5 through clearance C.
Displacer 2 moves towards bottom dead centre, and the volume of expansion space 3 reduces.Helium in the expansion space 3 turns back to the suction side of compressor 12 through clearance C, opening 16, regenerator 7, opening 11.At this moment, cooled dose of gas cooled of cool storage material.This operation is made as 1 circulation, and refrigeration machine comes cooling bench 5 is cooled off by carrying out this cool cycles repeatedly.
In the ultra-low temperature refrigerating device 1 and displacer 2 of present embodiment 1, heat-conduction part 2b is opposed with cooling bench 5 all the time across clearance C.The heat that enters from cooling bench through being present in clearance C helium and enter to heat-conduction part 2b.Therefore, when the 3 low temperature helium that produce pass clearance C in the expansion space, the heat exchange between helium and cooling bench 5, also carry out the heat exchange between helium and the heat-conduction part 2b.Thus, can increase actual heat exchange area between cooling bench 5 and the low temperature helium.
And the heat that enters heat-conduction part 2b further 3 transmits towards the expansion space in the inside of heat-conduction part 2b.Therefore, if the low temperature helium that heat-conduction part 2b is constituted in heat-conduction part 2b and the expansion space 3 contacts, then can further improve heat exchanger effectiveness.
With respect to this, in the mode that does not possess heat-conduction part 2b, namely in the displacer in the past that the part corresponding with heat-conduction part 2b is made of phenolic resins, the heat exchange between helium and the phenolic resins is considerably less, does not in fact carry out heat exchange.Therefore, when the 3 low temperature helium that produce pass clearance C in the expansion space, only carry out the heat exchange between helium and the cooling bench 5.
So, according to ultra-low temperature refrigerating device 1 and the displacer 2 of present embodiment 1, compare with displacer in the past, can make heat-conduction part 2b also help heat exchange effectively, therefore can increase the actual heat exchange area.And the flowing of heat that can produce by the inside at above-mentioned heat-conduction part 2b further improved rate of heat exchange.That is, also can reduce the temperature difference of above-below direction among Fig. 1 of cooling bench 5, the temperature difference in the time of can reducing that especially cooled object is arranged at the downside of cooling bench 5.
And if use phenolic resins as displacer in the past in the part of corresponding heat exchange department 2b, then the relative linear expansion coefficient because of phenolic resins is bigger, and temperature descends and will shrink, thus the possibility that exists overlapping 2ba to throw off from superimposed 2ab.With respect to this, in the ultra-low temperature refrigerating device 1 and displacer 2 of present embodiment 1, dispose linear expansion coefficient greater than overlapping the 2ba of main part 2a in interior all sides of superimposed the 2ab of main part 2a.Therefore, if superimposed the 2ab of main part 2a is cooled and shrinks, then effect has overlapping the 2ba of couple heat-conduction part 2b to carry out fastening power, thereby can prevent that overlapping 2ba from throwing off.
And, according to ultra-low temperature refrigerating device 1 and the displacer 2 of present embodiment 1, also help heat exchange to increase the actual heat exchange area by making heat-conduction part 2b.Therefore, compare with displacer in the past, even shorten axial (moving direction of displacer) length of cooling bench 5 and clearance C, also can access desirable refrigerating capacity.Thus, flow path resistance or the pressure loss in the clearance C can be reduced, and the refrigerating efficiency of refrigeration machine can be increased.And the volume that dwindles clearance C also relates to and reduces not help the cold dead volume that produces.Thus, the high pressure in 1 circulation can also expecting to suppress to cause because of dead volume and the pressure differential of low pressure reduce.
In addition, also can be set at overlapping 2ba with superimposed 2ab formation threaded portion and by screwing togather the structure that is connected.Accordingly, can carry out the loading and unloading of main part 2a and heat-conduction part 2b more like a cork.In addition, in this case, if superimposed the 2ab of main part 2a is cooled and shrinks, then effect has overlapping the 2ba of couple heat-conduction part 2b to carry out fastening power, thereby can prevent further that overlapping 2ba from throwing off.
[embodiment 2]
In above-described embodiment 1 heat-conduction part 2b is made as cylindricly, but also can as described belowly be made as tubular.Fig. 2 is the ultra-low temperature refrigerating device 21 of expression present embodiment 2 and the schematic diagram of displacer 22.In addition, the symbol to additional identical with the common constitutive requirements of the embodiment 1 of Fig. 1 mainly illustrates discrepancy.
In the displacer 22 of present embodiment 2,22b is made as tubular with heat-conduction part, and heat-conduction part 22b is whole to constitute overlapping overlapping the 22ba on stroke directions with respect to main part 22a.Compare with the part that is positioned at ratio open 16 more close high temperature sides (top), the part that is arranged in ratio open 16 more close low temperature sides (Fig. 2 is the below) of main part 22a is set as path.And this path partly constitutes and overlapping superimposed the 22ab that 22ba is corresponding.
Overlapping 22ba has the 1st 22bah of hole portion, and superimposed 22ab has the 2nd hole portion 22abh corresponding with the 1st 22bah of hole portion.Main part 2a and heat exchange department 2b are by being pressed into and inserting the 2nd 22abh of hole portion and the 1st 22bah both sides' of hole portion pressure pin 26(insertion section) be connected.About heat-conduction part 22b, use thermal conductivitys such as copper, aluminium, stainless steel at least greater than the material of main part 2a in the same manner with embodiment 1.This pressure pin 26 also can be phenolic resins (phenolic aldehyde cloth), stainless any.By making overlapping 22ba be fixed in superimposed 22ab pressure pin 26 insertion the 1st 22bah of hole portion and the 2nd 22abh of hole portion.
According to ultra-low temperature refrigerating device 21 and the displacer 22 of present embodiment 2, also can be identical with embodiment 1, help heat exchange to increase heat exchange area by making heat-conduction part 22b.In addition, compare with embodiment 1, in the present embodiment 2 heat-conduction part 22b only is disposed at the outer circumferential side of the displacer 22 that helps heat exchange.Therefore, compare with embodiment 1, can reduce volume and the quality of heat-conduction part 22b, and can reduce the quality as displacer 22 integral body of movable part.
And, exist under the situation in magnetic field, if round mobile as the heat-conduction part 22b of conductor, then can produce vortex flow, and the heating that generation causes thus is copper loss.In the mode of present embodiment 2, because the volume of heat-conduction part 22b is less relatively, therefore can correspondingly suppress to produce copper loss with it.
And, owing to can constitute heat-conduction part 22b by specification tubing, therefore compare with embodiment 1 and can also realize that cost reduces.
As mentioned above, can expect to suppress to produce copper loss by the volume that reduces conductor, but also can suppress to produce vortex flow by shape design, suppress to produce copper loss thus.For example, Fig. 3 is for to be provided with the structure that upwards constitutes discontinuous slit S in week at the heat-conduction part 22b of tubular shown in Figure 2.Based on this structure, can prevent that especially vortex flow is mobile along circumferentially continuing, therefore can suppress to produce copper loss more effectively.
And, as shown in Figure 4, heat-conduction part 22b can also be made as bottom tube-like.By heat-conduction part 22b has been made as bottom tube-like, the heat that enters heat exchange department 2b from cooling bench 5 carries out heat exchange between the bottom of heat-conduction part 22b and expansion space.Thus, compare with the refrigeration machine of Fig. 2 and can improve cooling effectiveness.
[embodiment 3]
In above-described embodiment 1～2, refrigeration machine is made as the one-level formula, but as described below can also being suitable for is the secondary formula.Fig. 5 is the ultra-low temperature refrigerating device 31 of expression present embodiment 3 and the schematic diagram of displacer 32.
The ultra-low temperature refrigerating device 31 of present embodiment 3 is identical with embodiment 1～2, for example for to utilize helium as Ji Fude-McMahon (GM) formula refrigeration machine of refrigerant gas.As shown in Figure 5, ultra-low temperature refrigerating device 31 the 2nd displacer 36 that possesses the 1st displacer 32 and on long side direction, link with the 1st displacer 32.The 1st displacer 32 and the 2nd displacer sell 33, connector 34, pin 35 couple together for example as shown in Figure 5.
The 1st cylinder body 37 and the 2nd cylinder body 38 form as one, and the temperature end of the low-temperature end of the 1st cylinder body 37 and the 2nd cylinder body 38 is connected in the 1st cylinder body 37 bottoms.The 2nd cylinder body 38 forms with the 1st cylinder body 37 coaxial, and is than the 1st cylinder body 37 cylinder part of path more.The 1st cylinder body 37 holds the 1st displacer 32 coming and going mobile mode along long side direction, the 2nd cylinder body 38 holds the 2nd displacer 36 coming and going mobile mode along long side direction.
About the 1st cylinder body 37, the 2nd cylinder body 38, from considerations such as intensity, thermal conductivity, helium isolating powers, use for example stainless steel.In the 2nd displacer 36, constitute the overlay film of fluororesin uniform wearability resin at the outer peripheral face of metal tubes processed such as stainless steel.
The temperature end of the 1st cylinder body 37 is provided with and comes and goes the not shown scotch yoke mechanism that drives the 1st displacer 32 and the 2nd displacer 36.The 1st displacer 32, the 2nd displacer 36 come and go mobile along the 1st cylinder body 37, the 2nd cylinder body 38 respectively.
The 1st displacer 32 has outer peripheral face cylindraceous, and the inside of the 1st displacer 32 is filled with the 1st cool storage material.The internal capacity of the 1st displacer 32 plays a role as the 1st regenerator 39.The top of the 1st regenerator 39 is provided with rectifier 40, and the bottom is provided with rectifier 41.Temperature end at the 1st displacer 32 is formed with the 1st opening 42 that makes refrigerant gas be passed to the 1st displacer 32 from room temperature chamber 39.Room temperature chamber 39 is spaces that the temperature end by the 1st cylinder body 37 and the 1st displacer 32 forms, and its volume changes along with the round movement of the 1st displacer 32.Among making by compressor 43, supply valve 44 and returning the interconnected pipe arrangement of suction and discharge system that valve 45 constitutes, share pipe arrangement for row and be connected in room temperature chamber 39.And, between the part of leaning on temperature end partially of the 1st displacer 32 and the 1st cylinder body 37 seal 46 is installed.
The low-temperature end of the 1st displacer 32 is formed with and makes refrigerant gas import the 2nd opening 48 of the 1st expansion space 47 through the 1st clearance C 1.The 1st expansion space 47 is the spaces that formed by the 1st cylinder body 37 and the 1st displacer 32, and its volume changes along with the round movement of the 1st displacer 32.The position configuration corresponding with the 1st expansion space 47 in the 1st cylinder body 37 peripheries has thermally coupled to be through the refrigerant gas cooling of the 1st clearance C 1 in the 1st cooling bench 49, the 1 cooling benches 49 of not shown cooled object.
The 2nd displacer 36 has outer peripheral face cylindraceous, and the inside of the 2nd displacer 36 is filled with the 2nd cool storage material.The internal capacity of the 2nd displacer 36 constitutes the 2nd regenerator 50.The temperature end of the 1st expansion space 47 and the 2nd displacer 36 is communicated with by not shown access.Refrigerant gas is passed to the 2nd regenerator 50 through this access from the 1st expansion space 47.
The low-temperature end of the 2nd displacer 36 is formed be used to making refrigerant gas be passed to the 3rd opening 52 of the 2nd expansion space 51 through the 2nd clearance C 2.The 2nd expansion space 51 is the spaces that formed by the 2nd cylinder body 38 and the 2nd displacer 36, and its volume changes along with the round movement of the 2nd displacer 36.The 2nd clearance C 2 is the gap that is formed by the low-temperature end of the 2nd cylinder body 38 part and the 2nd displacer 36, and the 2nd clearance C 2 constitutes bigger than the gap that has between spiral fluted the 2nd displacer 36 and the 2nd cylinder body 38 described later.
In the position corresponding with the 2nd expansion space 51 of the 2nd cylinder body 38 peripheries, dispose thermally coupled is through the 2nd clearance C 2 in the 2nd cooling bench 53, the 2 cooling benches 53 of cooled object refrigerant gas cooling.
About the 1st displacer 32, from viewpoints such as proportion, intensity, thermal conductivitys, use for example phenolic aldehyde cloth etc.The 1st cool storage material is made of for example woven wire etc.And, constitute the 2nd cool storage material by seize cool storage materials such as shot vertically on both sides by the arms with for example felt and woven wire.
In addition, be formed with helicla flute 53 at the outer peripheral face of the 2nd displacer 36, this helicla flute 53 has the top that is communicated with the 2nd expansion space 51 through the 2nd clearance C 2, and extends to the 1st expansion space 47 sides with helical form.
In present embodiment 3, the 1st displacer 32 and the 2nd displacer 36 both sides also possess hot transfer part 32b, 36b respectively in low-temperature end.Both sides all have the cylindric of secondary shape.Hot transfer part 32b is fixed in main part 32a by pressure pin 54, and hot transfer part 36b is fixed in main part 36a by pressure pin 55.In present embodiment 3, also according to the reason described in the embodiment 1～2, can in the 1st cooling bench 49, the 2nd cooling bench 53 both sides, increase the actual heat exchange area and improve cooling effectiveness.
More than the preferred embodiments of the present invention are had been described in detail, but the invention is not restricted to above-described embodiment, in not departing from the scope of the present invention, can apply various distortion and displacement to above-described embodiment.
For example, above-mentioned ultra-low temperature refrigerating device shows the situation that progression is one-level and secondary, but this progression can suitably be chosen as three grades etc.And, in the embodiment, be that the example of GM refrigeration machine is illustrated to ultra-low temperature refrigerating device, but be not limited thereto.For example, the present invention can also be applicable to that sterlin refrigerator, Suhl prestige refrigeration machine etc. possess any refrigeration machine of displacer.
Utilizability on the industry
The present invention need not to increase cooling bench axially on length, just can increase actual helping effectively improves the efficient of heat exchange through the heat exchange area of the heat exchange of side clearance, thus the raising refrigerating efficiency.Therefore, can be applicable to various ultra-low temperature refrigerating devices.
The application advocates the priority based on Japanese patent application 2012-001627 number of application on 01 06th, 2012.The full content of this application is applied in this specification by reference.
Claims (10)
1. ultra-low temperature refrigerating device is characterized in that possessing:
Displacer;
Cylinder body holds this displacer and makes this displacer can be along moving axially, and form the expansion space between the low-temperature end of described cylinder body and this displacer;
The gap stream is formed between described displacer and the described cylinder body, is used for making refrigerant gas be passed to described expansion space; And
Cooling bench is in and described expansion space position adjacent,
Described displacer comprises main part and heat-conduction part, and described heat-conduction part is made of the material that thermal conductivity is higher than this main part,
Described heat-conduction part is across described gap stream and opposed with described cooling bench.
2. ultra-low temperature refrigerating device as claimed in claim 1 is characterized in that,
The linear expansion coefficient of described heat-conduction part is less than described main part.
3. ultra-low temperature refrigerating device as claimed in claim 1 or 2 is characterized in that,
Described heat-conduction part has with respect to described main part overlapping overlapping portion on the stroke directions of described displacer, and described main part has the superimposed portion corresponding with this overlapping.
4. ultra-low temperature refrigerating device as claimed in claim 3 is characterized in that,
Described heat-conduction part is for there being bottom tube-like.
5. as each described ultra-low temperature refrigerating device in the claim 1 to 3, it is characterized in that,
Described heat-conduction part is tubular, and has and upwards make the discontinuous slit of this tubular week.
6. as claim 4 or 5 described ultra-low temperature refrigerating devices, it is characterized in that,
Described overlapping and described superimposed constitutes the threaded portion.
7. as each described ultra-low temperature refrigerating device in the claim 3 to 6, it is characterized in that,
Described overlapping portion has the first hole portion, and described superimposed portion has the second hole portion corresponding with the described first hole portion, and described main part is connected with described first both sides' of hole portion insertion parts by being inserted in this second hole portion with described heat-conduction part.
8. as each described ultra-low temperature refrigerating device in the claim 1 to 7, it is characterized in that,
Described heat-conduction part is any in copper, aluminium, the stainless steel.
9. displacer, it has low-temperature end, it is characterized in that, comprising:
Main part;
Heat-conduction part, it is distolateral and be made of the material that thermal conductivity is higher than described main part to be positioned at described low temperature.
10. displacer as claimed in claim 9 is characterized in that,
At normal temperatures, the external diameter of described heat-conduction part is less with respect to the external diameter of described main part.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-001627 | 2012-01-06 | ||
| JP2012001627A JP5917153B2 (en) | 2012-01-06 | 2012-01-06 | Cryogenic refrigerator, displacer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103196254A true CN103196254A (en) | 2013-07-10 |
| CN103196254B CN103196254B (en) | 2016-01-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310003022.9A Active CN103196254B (en) | 2012-01-06 | 2013-01-04 | Ultra-low temperature refrigerating device and displacer |
Country Status (3)
| Country | Link |
|---|---|
| US (2) | US20130174582A1 (en) |
| JP (1) | JP5917153B2 (en) |
| CN (1) | CN103196254B (en) |
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| JP6147208B2 (en) * | 2014-03-05 | 2017-06-14 | 住友重機械工業株式会社 | Regenerative refrigerator |
| JP6403539B2 (en) | 2014-10-29 | 2018-10-10 | 住友重機械工業株式会社 | Cryogenic refrigerator |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2013142479A (en) | 2013-07-22 |
| US20180156500A1 (en) | 2018-06-07 |
| CN103196254B (en) | 2016-01-20 |
| US20130174582A1 (en) | 2013-07-11 |
| JP5917153B2 (en) | 2016-05-11 |
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