CN103115453A - Linear type streamlined air inlet structure and manufacturing method of pulse tube refrigerator - Google Patents
Linear type streamlined air inlet structure and manufacturing method of pulse tube refrigerator Download PDFInfo
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- CN103115453A CN103115453A CN201310039078XA CN201310039078A CN103115453A CN 103115453 A CN103115453 A CN 103115453A CN 201310039078X A CN201310039078X A CN 201310039078XA CN 201310039078 A CN201310039078 A CN 201310039078A CN 103115453 A CN103115453 A CN 103115453A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/14—Compression machines, plants or systems characterised by the cycle used
- F25B2309/1406—Pulse-tube cycles with pulse tube in co-axial or concentric geometrical arrangements
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Abstract
The invention discloses a linear type streamlined air inlet structure and a manufacturing method of a pulse tube refrigerator. The linear type streamlined air inlet structure of the pulse tube refrigerator is composed of a transitional tube, a linear type streamlined diffusion structure and a regenerator coupling seat. The transitional tube is connected with a connecting tube at an air inlet end, the linear type streamlined diffusion structure is welded into one by two symmetrical groove structure section parts, the groove structure section parts are machined and milled precisely along symmetrical internal surface shaped lines, the regenerator coupling seat is a coupling connector of an air outlet and is connected with a regenerator, and penetrating narrow slit of the regenerator coupling seat can play a role in diversion and heat dissipation effect on air flows. The linear type streamlined diffusion structure is connected with the transitional tube in a silver soldering mode, and the air outlet end of the linear type streamlined diffusion structure is connected with the regenerator coupling seat in a brazed mode. Under the condition of oscillating air flows, the linear type streamlined air inlet structure can reduce flow resistance and turbulent flow disturbance of the linear type streamlined air inlet structure to the air flows, is favorable to fluency and smoothness of flow fields of the air flow, and therefore whole machine property of the pulse tube refrigerator is improved.
Description
Technical field
The present invention relates to pulse tube refrigerating machine, particularly a kind of linear pattern streamlined air intake structure and manufacture method of pulse tube refrigerating machine.
Background technology
The pulse tube refrigeration machine technology proposed and obtains to develop rapidly the eighties in the sixties in 20th century.Compare with sterlin refrigerator or G-M refrigeration machine, pulse tube refrigerating machine replaces displacer with pulse tube, realize phase place accent machine by the hot junction phase modulating mechanism, have that mechanical oscillation are little, simple in structure, service life is long, high reliability, and larger superiority and application prospect are widely arranged in fields such as Aero-Space, cryotronics, superconductor technology, Medical Instruments, mobile communication base stations.
Different according to the relative position of regenerator 2 and pulse tube, pulse tube refrigerating machine mainly contains the linearity layout, U-shaped is arranged and coaxial shape is arranged three kinds of structures, as shown in Figure 1.During linear is arranged, pulse tube 3 is in a straight line with regenerator 2, air-flow flows therein without turning back, resistance is minimum, refrigerating efficiency is the highest in three kinds of modes, but because its cold head is positioned at refrigeration machine middle part, be unfavorable for and device coupling, and the refrigeration machine axial dimension is multiplied, line arrangement and vacuum tank structure become very complicated.Coaxial shape arranges that pulse tube 3 coaxial arrangement that refer to hollow are at regenerator 2 centers, major advantage is compact conformation, cold head is convenient to be coupled with device, but turnover 180 degree when this layout makes air-flow flow into pulse tube from annular cold accumulator 2, local resistance increases, cause larger irreversible loss, and the generation heat transfer losses also affects its performance on regenerator 2 and the common tube wall of pulse tube 3, this layout is applicable to bulk is had the occasion of specific (special) requirements.U-shaped is arranged and compare its structure with linear compacter between linear and coaxial shape, compare its fluid with coaxial shape and flow to pulse tube by the U-shaped transition, because of the loss that turnover causes less.
Air intake structure is realized the transmission of pressure and quality by air intake structure between regenerator 2 and compressor 1 between compressor 1 and regenerator 2.Air intake structure ideally should possess: 1) void volume is infinitely small; 2) infinitely small two characteristics of flow resistance of convection cell generation.Air intake structure commonly used adopts vertical-type and two kinds of arrangements of linear pattern, and Fig. 2 provides the arrangement form for the air intake structure of U-shaped and the pulse tube refrigerating machine that linear pattern is arranged.Pulse tube refrigerating machine shown in Fig. 2 (a) and Fig. 2 (b) adopts the air intake structure of vertical-type arrangement, and air-flow is flow direction generation normal deflection when entering regenerator 2 through air intake structure; Shown in Fig. 2 (c) and Fig. 2 (d), pulse tube refrigerating machine has adopted the air intake structure of linear pattern arrangement, and air-flow flow direction when entering regenerator 2 through air intake structure does not deflect.
Fig. 3 provides the pulse tube refrigerating machine schematic diagram that adopts conventional linear pattern air intake structure.The linear pattern air intake structure comprises the parts such as conventional linear pattern diffusion structure 25, compressor end hose coupler 7, connecting leg 9 and regenerator end hose coupler 11, cooler end hose coupler 11 embeds conventional linear pattern diffusion structure 25 and connects, connecting leg 9 and compressor end hose coupler 7 and regenerator end hose coupler 11 are connected with pad at pad 1 by silver soldering respectively and 10 are connected, and seal by sealing ring 1 and sealing ring 2 12.
Conventional linear pattern air intake structure shortcoming is mainly reflected on the resistance of its shape or the generation of structure convection cell, as shown in Figure 3, when working gas is flowed through conventional linear pattern air intake structure, produce turbulent flow and even jet because conventional linear pattern air intake structure causes the flow section sudden enlargement, thereby cause larger irreversible loss.
Summary of the invention
In view of the shortcoming that exists in above-mentioned prior art, the present invention proposes a kind of linear pattern streamlined air intake structure and manufacture method that is applicable to pulse tube refrigerating machine.
The object of the invention is to, when air intake structure is the linear pattern layout, streamlined air intake structure of design between the compressor 1 of pulse tube refrigerating machine and regenerator 2, by optimizing shape and the structure of air intake structure, make flow resistance and the turbulent disturbance of air-flow by the linear pattern air intake structure time minimum, thereby promote the overall efficiency of pulse tube refrigerating machine.
Fig. 4 has provided the schematic diagram that uses the pulse tube refrigerating machine of the linear pattern streamlined air intake structure of inventing.Linear pattern streamlined air intake structure 14 is connected with compressor 1 by compressor end hose coupler 7 and connecting leg 9, and linear pattern streamlined air intake structure 14 circles in pad 15 place's surroundings with regenerator 2 and adopts the Laser Welding technology to be connected sealing.
Fig. 5 has provided the streamlined air intake structure schematic diagram of the pulse tube refrigerating machine linear pattern of inventing.Fig. 5 cathetus type streamlined air intake structure is comprised of three parts such as transition conduit 16, linear pattern streamlined diffusion structure 18, regenerator coupling seats 20.transition conduit 16 air inlet ends have the hole of the degree of depth 3 ~ 5mm, and the aperture is equal to or slightly less than connecting leg 9 external diameters, and both carry out silver soldering at pad 3 13 places and are tightly connected, transition conduit 16 gas outlet ends insert linear pattern streamlined diffusion structure 18 air inlet end 1～3mm, and 5 17 places carry out sealed with brazing at pad, regenerator coupling seat 20 bottom cylinder platforms 27 are positioned on linear pattern streamlined diffusion structure 18 gas outlet end cascaded surfaces, regenerator coupling seat 20 bottom cone bosses 28 go deep into linear pattern streamlined diffusion structure 18 gas outlet ends, its bottom flushes with or slightly higher than linear pattern streamlined diffusion structure 18 and crosses d point vertical plane, the bottom cylinder platform 27 of regenerator coupling seat 20 plays water conservancy diversion and thermolysis with the uniform slit of bottom cone boss 28, bottom cone boss 28 gos deep into the dead volume that linear pattern streamlined diffusion structure 18 gas outlet ends effectively reduce linear pattern streamlined diffusion structure 18.Linear pattern streamlined diffusion structure 18 and regenerator coupling seat 20 are tightly connected at pad 6 19 places by soldering.Regenerator coupling seat 20 and regenerator 2 carry out Laser Welding at pad 4 15 places and are tightly connected.Thereby form the linear pattern streamlined air intake structure of pulse tube refrigerating machine.
As shown in Figure 6, linear pattern streamlined diffusion structure 18 is comprised of groove structural profile spare 1 and groove structural profile spare 2 22, and two groove structural profile spares are take the B-B face as the plane of symmetry, and the groove structure take the inner surface molded line as benchmark is principal character.Take groove structural profile spare 1 as example, as shown in Fig. 6 (c), Fig. 6 (d), the groove structure of groove structural profile spare 1 is take inner surface molded line CDdc as benchmark, the cross section is semicircle, the groove inner surface is smooth, and Roughness Surface on Control is conducive to reduce fluid flow resistance at 0.05～0.1mm; Groove structural profile spare one 21 mating surface flatnesses are controlled at 0 ~ 0.03mm, so that mating surface corresponding to groove structural profile spare 2 22 fits tightly when coordinating.Groove structural profile spare is equal to or slightly less than transition conduit 16 exradius at air inlet end half slot radius surface, the degree of depth is 1 ~ 3mm approximately, gas outlet end half slot radius surface is equal to or slightly less than regenerator coupling seat 20 bottom cylinder platform 27 radiuses, the degree of depth equals the height of regenerator coupling seat 20 bottom cylinder platforms 27, thereby forms corresponding cascaded surface to assemble with transition conduit 16 and regenerator coupling seat 20.
As shown in Fig. 6 (a), groove structural profile spare 1 and groove structural profile spare 2 22 are welded as a whole by soldering position, back pad 7 23, belly soldering position pad 8 24, thereby form linear pattern streamlined diffusion structure 18.Fig. 6 (b) has provided the cross section view of linear pattern streamlined diffusion structure 18.As shown in Fig. 6 (b), the streamlined conduit of linear pattern streamlined diffusion structure 18 is used for the diffusion of air-flow, and there is thermolysis in other zones outside the streamlined conduit to air-flow.
Linear pattern streamlined diffusion structure 18 inner surface molded line CDdc are made of oval segmental arc CD, dc and three sections linear light slips of line segment Dd, its mid point C is linear pattern streamlined diffusion structure 18 air inlet end back points, point c, some h are respectively linear pattern streamlined diffusion structure 18 gas outlet ends and regenerator coupling seat 20 mating surface back points and belly point, put K and be transition conduit 16 air inlet end back points.As shown in Figure 9, some C is about 1/4 of cK horizontal direction distance apart from the distance of a K, and some c equals regenerator 2 diameters with some h distance.Oval segmental arc CD place ellipse long and short shaft length ratio is 5:1, long axis length and CK distance are 1:1, oval segmental arc cd place transverse length and oval segmental arc CD place transverse length ratio are 1:1, center of circle a is positioned on the ch line, and be 0.5(ch-2R apart from some c distance), wherein R is connecting leg 1 radius.The oval segmental arc CD of the connection that line segment Dd is smooth, dc are in a D, some d.
Fig. 7 has provided the cutaway view of transition conduit 16.Transition conduit 16 connects connecting leg 9 and linear pattern streamlined diffusion structure 18 as air inlet end coupling interface, and air-flow is played guide functions.Transition conduit 16 length are 25 ~ 30mm, it is one section hollow tube, its internal diameter equates with connecting leg 9 internal diameters, at the air inlet end, the degree of depth approximately hole of 3 ~ 5mm is arranged, the aperture is equal to or slightly less than connecting leg 9 external diameters, be the chamfering of 30 ~ 60 degree, the degree of depth 0.1 ~ 0.5mm along angle is arranged in Kong Bianyi week, for carry out silver soldering after transition conduit 16 and connecting leg 9 close-fittings.
Fig. 8 has provided the schematic diagram of regenerator coupling seat 20.As shown in Fig. 8 (a), regenerator coupling seat 20 has a platform 26 apart from 1/3 place that end face is about tip thickness, and its diameter is slightly less than or equals regenerator 2 external diameters; One cylinder platform 27 is arranged at the bottom, and its external diameter is greater than regenerator 2 external diameters; Cone boss 28 is arranged on cylinder platform 27, and its substrate external diameter is slightly larger than or equals regenerator 2 external diameters, and less than cylinder platform 27 external diameters, after assembling, cone boss 28 bottom end faces should flush in or cross some d vertical plane a little more than linear pattern streamlined diffusion structure 18; To cone boss 28 bottom center, through hole is arranged from tip platform 26, diameter is at 1 ~ 1.5mm, centered by through hole around 2 ~ 15mm zone, approximately 45 ~ 60 to run through slit uniform radially, Fig. 8 (b) has provided the shape of slit diagram.
Characteristics of the present invention are as follows:
1) described pulse tube refrigerating machine linear pattern streamlined air intake structure is on conventional linear pattern air intake structure basis, replace conventional linear pattern diffusion structure with linear pattern streamlined diffusion structure, adopt the streamlined molded line to extend air intake structure gas changeover portion, reduce abrupt change of cross-section trend, the flow field is reduced because of the violent disturbance that the abrupt change of cross-section produces, thereby reduced the local resistance of flowing, the admission pressure loss is reduced;
2) for pulse tube refrigerating machine oscillating air flow flow feature, described pulse tube refrigerating machine streamlined air intake structure adopts the symmetry structure, is conducive to reduce the loss that the pulse tube refrigerating machine oscillating air flow causes at air intake structure;
3) pulse tube refrigerating machine linear pattern streamlined air intake structure inner surface molded line is smooth simple and clear, and described pulse tube refrigerating machine linear pattern streamlined air intake structure can adapt to pulse tube refrigerating machine to the requirement of air intake structure linear pattern arrangement.
The said structure characteristics reduce the impact on air-flow of the linear pattern air intake structure of pulse tube refrigerating machine, the particularly employing of linear pattern streamlined diffuser pipe, under the condition of refrigerating device inner air-flow vibration, the minimise loss of pressure that air-flow is caused due to the flow section sudden change, be conducive to the smooth level and smooth of air velocity distribution, reduce the disturbance that air-flow produces because of air inlet, thereby improve the overall performance of pulse tube refrigerating machine.
Description of drawings
Fig. 1 is three kinds of method for arranging schematic diagrames of pulse tube refrigerating machine, and wherein Fig. 1 (a) arranges for linear pattern, and Fig. 1 (b) is U-shaped layout, and Fig. 1 (c) arranges for coaxial type.
Fig. 2 is for adopting the method for arranging of pulse tube refrigerating machine air intake structure, wherein Fig. 2 (a) is the vertical-type layout of U-shaped pulse tube refrigerating machine air intake structure, Fig. 2 (b) is that the vertical-type of linear pattern pulse tube refrigerating machine air intake structure is arranged, Fig. 2 (c) is that the linear pattern of U-shaped pulse tube refrigerating machine air intake structure is arranged, Fig. 2 (d) is that the linear pattern of linear pattern pulse tube refrigerating machine air intake structure is arranged.
Fig. 3 is for adopting conventional linear pattern air intake structure pulse tube refrigerating machine schematic diagram.
Fig. 4 is for adopting the pulse tube refrigerating machine schematic diagram of linear pattern streamlined air intake structure.
Fig. 5 is pulse tube refrigerating machine linear pattern streamlined air intake structure schematic diagram.
Fig. 6 is linear pattern streamlined diffusion structural representation, wherein Fig. 6 (a) is linear pattern streamlined diffusion structure A-A cutaway view, Fig. 6 (b) is linear pattern streamlined diffusion structure cutaway view, Fig. 6 (c) is linear pattern streamlined diffusion structure grooves structural profile spare one C-C cutaway view, and Fig. 6 (d) is linear pattern streamlined diffusion structure grooves structural profile spare one.
Fig. 7 is the transition conduit cutaway view.
Fig. 8 is regenerator coupling seat schematic diagram.Wherein Fig. 8 (a) is regenerator coupling seat cutaway view; Fig. 8 (b) is regenerator coupling seat D-D cutaway view.
Fig. 9 is linear pattern streamlined diffusion structure inner surface molded line schematic diagram.
wherein: 1 is connecting leg, 2 is regenerator, 3 is pulse tube, 4 is phase modulation apparatus, 5 is air reservoir, 6 is sealing ring one, 7 is the compressor end hose coupler, 8 is pad one, 9 is connecting leg, 10 is pad two, 11 is regenerator end hose coupler, 12 is sealing ring two, 13 is pad three, 14 is linear pattern streamlined air intake structure, 15 is pad four, 16 is transition conduit, 17 is pad five, 18 is linear pattern streamlined diffusion structure, 19 is pad six, 20 is the regenerator coupling seat, 21 is groove structural profile spare one, 22 is groove structural profile spare two, 23 is pad seven, 24 is pad eight, 26 is regenerator mount pad tip platform, 27 is regenerator mount pad bottom cylinder platform, 28 is regenerator mount pad bottom cone boss.Point K is transition conduit 16 air inlet end back points, point c is linear pattern streamlined diffusion structure 18 gas outlet ends and regenerator coupling seat 20 mating surface back points, point h is linear pattern streamlined diffusion structure 18 gas outlet ends and regenerator coupling seat 20 mating surface belly points, point C, some D, some d, some c consist of respectively oval segmental arc CD, dc, line segment Dd, and then consist of linear pattern streamlined diffusion structure 18 inner surface molded line CDdc.
The specific embodiment
Below in conjunction with accompanying drawing, specific implementation method of the present invention is described in further detail.
The pulse tube refrigerating machine linear pattern streamlined air intake structure of inventing is comprised of three parts such as transition conduit 16, linear pattern streamlined diffusion structure 18, regenerator coupling seats 20 as shown in Figure 5.
Fig. 4 has provided the schematic diagram that uses the pulse tube refrigerating machine of the linear pattern streamlined air intake structure of inventing.Linear pattern streamlined air intake structure 14 is connected with compressor 1 by compressor end hose coupler 7 and connecting leg 9, wherein connecting leg 9 is connected in pad one 8 places employing silver soldering with compressor end hose coupler 7, compressor end hose coupler 7 Embedded compression machine 1 gas outlets seal by sealing ring 1.Regenerator 2 embeds linear pattern streamlined air intake structure 14, and 4 15 places adopt the Laser Welding technology to connect sealing in a peripheral week at pad.
Fig. 5 has provided the schematic diagram of the pulse tube refrigerating machine linear pattern streamlined air intake structure of inventing.Concrete preparation method is: connecting leg 9 inserts approximately 5mm of transition conduit 16 air inlet ends, and both are connected and sealed in pad 3 13 places employing silver soldering; Transition conduit 16 gas outlet ends embed about linear pattern streamlined diffusion structure 18 air inlet end 1mm, and 5 17 places clean the sealed with brazing connection at pad; Regenerator coupling seat 20 bottom cylinder platforms 27 are positioned on linear pattern streamlined diffusion structure 18 gas outlet end cascaded surfaces, regenerator coupling seat bottom cone boss 28 inserts linear pattern streamlined diffusion structure 18 gas outlet ends, and regenerator coupling seat 20 and linear pattern streamlined diffusion structure 18 adopt the cleaning soldering tech to be tightly connected at pad 6 19 places; Regenerator coupling seat 20 and regenerator 2 are tightly connected in pad 4 15 places employing Laser Welding.Thereby form the linear pattern streamlined air intake structure of pulse tube refrigerating machine.
Fig. 6 has provided the structural representation of linear pattern streamlined diffusion structure 18.Concrete preparation method is: at first make groove structural profile spare 1, as shown in Fig. 6 (c), Fig. 6 (d), take its inner surface molded line CDdc as benchmark, process by CNC milling machine the groove structure that the cross section is semicircle; At air inlet end finish-milling semicircle groove face, radius is equal to or slightly less than transition conduit 16 exradius, and the degree of depth is 1mm. approximately; Be equal to or slightly less than the semicircle groove face of regenerator coupling seat 20 bottom cylinder platform 27 radiuses in end finish-milling footpath, gas outlet, the degree of depth equals the height of regenerator coupling seat 20 bottom cylinder platforms 27, thereby forms corresponding cascaded surface; Then groove face is carried out polishing, so that rooved face is smooth, the rooved face roughness is controlled at 0.05～0.1mm; The finish-milling mating surface, flatness is controlled at 0 ~ 0.03mm; Groove structural profile spare 2 22 is symmetrical take the B-B face as the plane of symmetry with groove structural profile spare 1, and in kind working groove structural profile spare 2 22; At last groove structural profile spare 1 and groove structural profile spare 2 22 symmetries are fitted tightly, as shown in Fig. 6 (a), after fitting tightly, connect as one at soldering position, back pad 7 23 and belly soldering position pad 8 24 solderings, thereby form linear pattern streamlined diffusion structure 18, as shown in Fig. 6 (b).
Fig. 7 has provided the cutaway view of transition conduit 16.The concrete preparation method of transition conduit 16 is: transition conduit 16 is one section hollow tube, length is 25 ~ 30mm, diameter of bore equates with connecting leg 9 internal diameters, in car hole, air inlet end face center, the degree of depth is 5mm, and the aperture is slightly less than connecting leg 9 external diameters, along all chamferings in edge, hole one, angle 45 degree, degree of depth 0.5mm is for carry out silver soldering after transition conduit 16 and connecting leg 9 close-fittings.
Fig. 8 has provided the schematic diagram of regenerator coupling seat 20.Concrete preparation method is: as shown in Fig. 8 (a), 1/3 depths car goes out platform 26 apart from the top at regenerator coupling seat 20, and its diameter is slightly less than regenerator 2 external diameters; At bottom car cylinder platform 27, its external diameter is greater than regenerator 2 external diameters; At cylinder platform 27 cone boss 28 of getting on the bus out, its substrate external diameter is slightly larger than or equals regenerator 2 external diameters, and less than cylinder platform 27 external diameters; Drill through the hole in cone boss 28 bottoms, diameter 1.5mm in the zone of week a 2 ~ 15mm centered by through hole, adopts the slow wire feeding line cutting technology, evenly processes radially 60 and runs through slit, as shown in Fig. 8 (b).
Fig. 9 provides linear pattern streamlined diffusion structure inner surface molded line schematic diagram.Due to fluid vibration back and forth in air intake structure of pulse tube refrigerating machine, so linear pattern streamlined diffusion structure 18 inner surface molded line adopt the symmetry structure.Linear pattern streamlined diffusion structure 18 inner surface molded line CDdc are made of oval segmental arc CD, dc and three sections linear light slips of line segment Dd.Its mid point K is the point at transition conduit 16 air inlet end backs, point c is linear pattern streamlined diffusion structure 18 gas outlet ends and the point at regenerator coupling seat 20 mating surface backs, and putting h is the point of linear pattern streamlined diffusion structure 18 gas outlet ends and regenerator coupling seat 20 mating surface bellies.Point C is some c and 1/4 of some K horizontal direction distance with the distance of some K, and some c equals regenerator 2 diameters with some h distance.Oval segmental arc CD place ellipse is oval ABC, and its mid point A is that the center of circle, some B, some C are respectively the major and minor axis end points, and getting the major and minor axis length ratio is 5:1, and AB=CK is arranged.L is the extended line of connecting leg upper end line segment.Oval segmental arc cd place ellipse be oval abc, and its mid point a is the center of circle, put b, put c is respectively the major and minor axis end points, ab=AB wherein, and ac=0.5(ch-2R).Point f is positioned on the ac extended line and af=ab; Point g is positioned on the bc line and cg=cf, and some x is separated time and ab intersection point in gb; Can determine equally some X position.Cross respectively some X, the some x make the l vertical line, hand over respectively oval ABC, abc in a D, d.Connect Dd, get molded line CDcd, be the inner surface molded line of linear pattern streamlined diffusion structure 18.
Claims (2)
1. the linear pattern streamlined air intake structure of a pulse tube refrigerating machine, comprise transition conduit (16), linear pattern streamlined diffusion structure (18) and regenerator coupling seat (20), it is characterized in that: the internal diameter of transition conduit (16) equals the internal diameter of connecting leg (9), its air inlet end has the degree of depth approximately hole of 3 ~ 5mm, the aperture is equal to or slightly less than connecting leg (9) external diameter, air inlet chamfer angle is 30 ~ 60 degree, the degree of depth 0.1 ~ 0.5mm; Linear pattern streamlined diffusion structure (18) is comprised of two symmetrical channels structural profile spares that are welded as a whole, groove structural profile spare mainly the groove structure take inner surface molded line CDdc as benchmark as feature, the rooved face roughness is controlled at 0.05～0.1mm, inner surface molded line CDdc is by oval segmental arc CD, dc, three sections line smooth connections such as line segment Dd form, and some C is about 1/4 of cK horizontal direction distance apart from the distance of a K; The oval segmental arc CD of connection, dc that line segment Dd difference is smooth, intersection point is respectively a D, some d; Regenerator coupling seat (20) has a platform (26) apart from 1/3 place that end face is about tip thickness, and its diameter is slightly less than or equals regenerator (2) external diameter; One cylinder platform (27) is arranged at the bottom, and its external diameter is greater than regenerator (2) external diameter; Cone boss (28) is arranged on cylinder platform (27), and its substrate external diameter is slightly larger than or equals regenerator (2) external diameter, and less than cylinder platform (27) external diameter, cone boss (28) bottom is concordant with linear pattern streamlined diffusion structure (18) mistake point d vertical plane; From tip platform (26) to cone boss (28) bottom center, diameter 1 ~ 1.5mm through hole is arranged, centered by through hole around 2 ~ 15mm zone, approximately 45 ~ 60 integrated slits are uniform and run through radially; Transition conduit (16) is located silver soldering with connecting leg (9) at pad three (13) and is connected; Transition conduit (16) gas outlet end inserts approximately 1 ~ 3mm of linear pattern streamlined diffusion structure (18) air inlet end, locates to adopt sealed with brazing to connect at pad five (17); Regenerator coupling seat (20) bottom cylinder platform (27) is positioned on the end cascaded surface of linear pattern streamlined diffusion structure (18) gas outlet, and bottom cone boss (28) inserts linear pattern streamlined diffusion structure (18) gas outlet end; Both locate to be tightly connected at pad six (19) by soldering; Regenerator coupling seat (20) and regenerator (2) are located surrounding at pad four (15) and are carried out Laser Welding and be tightly connected, thereby form the linear pattern streamlined air intake structure of pulse tube refrigerating machine.
2. the manufacture method of a pulse tube refrigerating machine linear pattern streamlined air intake structure as claimed in claim 1 is characterized in that: transition conduit (16) is located pad three with connecting leg (9) in (13) and is adopted silver soldering to be connected; Transition conduit (16) gas outlet end inserts approximately 1 ~ 3mm of linear pattern streamlined diffusion structure (18) air inlet end, locates to adopt the cleaning soldering tech to weld at pad five (17); Regenerator coupling seat (20) bottom cone boss (28) insertion linear pattern streamlined diffusion structure (18) gas outlet end, bottom cylinder platform (27) is positioned on the end cascaded surface of linear pattern streamlined diffusion structure (18) gas outlet, locates to adopt the cleaning soldering tech to be connected and sealed at pad six (19); In transition conduit (16) air inlet end face car hole, the degree of depth is 5mm, and the aperture equals connecting leg (9) internal diameter, and at the air inlet chamfer, angle is 45 degree, degree of depth 0.1mm.Linear pattern streamlined diffusion structure (18) is comprised of two symmetrical channels structural profile spares, and groove structural profile spare processes by CNC milling machine the groove structure that the cross section is semicircle take inner surface molded line CDdc as benchmark; Approximate the groove face of regenerator coupling seat (20) bottom cylinder platform (27) radius at gas outlet end finish-milling radius of machining, the degree of depth equals regenerator coupling seat (20) bottom cylinder platform (27) highly, thereby forms the cascaded surface that coordinates with regenerator coupling seat (20); Equal transition conduit (16) thereby the cascaded surface that the formation of the groove face of exradius coordinates with transition conduit (16) at air inlet end finish-milling radius of machining, then degree of depth 1.5mm carries out grinding and polishing to groove face, and the rooved face roughness is controlled at 0.05～0.1mm; Finish-milling symmetrical profile spare mating surface, flatness is controlled in 0.03mm, and two symmetrical channels structural profile spares will fit tightly when coordinating, and connect as one by soldering after alignment.Be the 1.5mm through hole at regenerator coupling seat (20) bottom center drill diameter, and centered by through hole radially uniform, adopt the slow wire feeding line cutting technology, process 60 and run through slit; Regenerator coupling seat (20) tip platform (26) internal diameter is equal to or slightly less than the external diameter of regenerator (2), both close-fittings, and locating to circle in week at pad four (15) is connected and sealed by the Laser Welding technology.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106642822A (en) * | 2016-11-25 | 2017-05-10 | 中国科学院上海技术物理研究所 | Secondary intermediate heat exchanger for thermal coupling coaxial two-stage pulse pipe refrigerator and design method |
| CN107091539A (en) * | 2017-06-02 | 2017-08-25 | 中科力函（深圳）低温技术有限公司 | Pulse tube refrigerating machine |
| CN112240650A (en) * | 2020-09-15 | 2021-01-19 | 中国科学院上海技术物理研究所 | Straight-through slit precooling heat exchanger of precooling type low-temperature throttling refrigerator and manufacturing method |
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| CN1818512A (en) * | 2006-03-14 | 2006-08-16 | 中国科学院理化技术研究所 | Device for eliminating straight flow of two-way air inlet pulsing pipe refrigerator |
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| CN102032703A (en) * | 2010-11-26 | 2011-04-27 | 中国科学院上海技术物理研究所 | Integrated hot end phase adjusting structure of inertance-tube type pulse tube cooler and manufacturing method of phase adjusting structure |
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