CN117387257A - Condenser for GM refrigerator and preparation method thereof - Google Patents
Condenser for GM refrigerator and preparation method thereof Download PDFInfo
- Publication number
- CN117387257A CN117387257A CN202311702525.5A CN202311702525A CN117387257A CN 117387257 A CN117387257 A CN 117387257A CN 202311702525 A CN202311702525 A CN 202311702525A CN 117387257 A CN117387257 A CN 117387257A
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- condenser
- stainless steel
- oxygen
- main body
- free copper
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- 238000002360 preparation method Methods 0.000 title abstract description 4
- 238000003466 welding Methods 0.000 claims abstract description 88
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 83
- 239000010935 stainless steel Substances 0.000 claims abstract description 83
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000002131 composite material Substances 0.000 claims abstract description 71
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052786 argon Inorganic materials 0.000 claims abstract description 19
- 238000004880 explosion Methods 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 229910052802 copper Inorganic materials 0.000 claims description 43
- 239000010949 copper Substances 0.000 claims description 43
- 239000007788 liquid Substances 0.000 claims description 30
- 238000005219 brazing Methods 0.000 claims description 17
- 238000005520 cutting process Methods 0.000 claims description 6
- 239000002360 explosive Substances 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 23
- 238000007789 sealing Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 13
- 238000013461 design Methods 0.000 abstract description 10
- 230000007774 longterm Effects 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 22
- 239000000463 material Substances 0.000 description 14
- 238000005057 refrigeration Methods 0.000 description 9
- 238000009413 insulation Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 239000001307 helium Substances 0.000 description 5
- 229910052734 helium Inorganic materials 0.000 description 5
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910000679 solder Inorganic materials 0.000 description 4
- 229910052724 xenon Inorganic materials 0.000 description 4
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910052754 neon Inorganic materials 0.000 description 3
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004949 mass spectrometry Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
-
- 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
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The application discloses condenser for GM refrigerator and preparation method thereof, condenser for GM refrigerator includes: a cold head connecting plate, a composite material flange structure and a condenser body; the composite material flange structure comprises an oxygen-free copper structure layer and a stainless steel structure layer, wherein the stainless steel structure layer and the condenser body jointly form a condenser cavity, and the oxygen-free copper structure layer and the stainless steel structure layer are welded in an explosion welding mode; the oxygen-free copper structure layer comprises a first heat conduction main body part, and the stainless steel structure layer comprises a second heat conduction main body part and a welding flange; the welding flange protrudes from the second heat conduction main body part towards the condenser cavity and is welded with the condenser body in an argon arc welding mode, so that the composite material flange structure is in sealing connection with the condenser body in a sealing mode. The condenser for the GM refrigerator can be used at low temperature through ingenious design and manufacturing methods, and meanwhile, the condenser is high in structural strength and good in sealing performance, and leakage risk in a long-term operation process is greatly reduced.
Description
Technical Field
The application relates to the technical field of low-temperature engineering, in particular to a condenser for a GM refrigerator and a preparation method thereof.
Background
Along with the improvement of the industrial level in China, the requirements on various parts in the chemical technology are higher and higher. In the low-temperature and fine chemical industries, there are increasing and higher demands placed on condensers, such as (a) low service temperature, good thermal conductivity, and (b) no leakage of the condenser during long-term operation (helium mass spectrometry detection leakage rate less than 1×10) -11 The pressure range (1-1.6 Mpa) of Pa cubic meter per second), (c) can bear a wider pressure range, the internal cleanliness is high, and the pressure sensor can be suitable for high-purity gas or electronic grade special gas, and (f) can bear long-term temperature high-low temperature alternating working conditions.
However, the conventional condenser structure always has various disadvantages, and a plate-type, plate-fin-type or shell-and-tube-type heat exchanger is used, and the principle is that one stream of cold fluid (such as liquid nitrogen-196 ℃/liquid helium-269 ℃) is used for cooling and liquefying the other stream of hot fluid, so that a corresponding low-temperature fluid medium needs to be found. The conventional liquid nitrogen is not suitable for the refrigeration scene below-196 ℃, and the price of the liquid helium is too high. Meanwhile, the refrigeration energy of the heat exchanger of the fluid heat exchange type depends on the fluid flow, and the flow control is difficult, so that the temperature control precision is difficult to ensure.
The GM refrigerator is used as a cold source, and has the advantages of wide refrigeration temperature range, 70-100W of refrigeration capacity at-196 ℃ and stable refrigeration power, but the cold head structure is a circular plane, so that the GM refrigerator is difficult to directly use. Meanwhile, due to the characteristics of the GM refrigerator, the refrigeration power provided by the GM refrigerator is relatively fixed, so that the temperature is conveniently controlled, the GM refrigerator is suitable for different process requirements, and the condenser needs to be convenient for installing temperature control equipment.
Therefore, there is an urgent need in the present application to develop a condenser for GM refrigerator and a method for manufacturing the same, where the condenser for GM refrigerator can be used at low temperature by skillfully designing and manufacturing methods, and meanwhile, the condenser has high structural strength and good sealing property, so that the leakage risk in the long-term operation process is greatly reduced.
Disclosure of Invention
The condenser for the GM refrigerator can be used at low temperature through ingenious design and manufacturing methods, and meanwhile, is high in structural strength and good in sealing performance, and leakage risk in a long-term operation process is greatly reduced.
The application provides a condenser for GM refrigerator, comprising:
a cold head connection plate, a composite flange structure, and a condenser body, the cold head connection plate configured to be connected with a GM refrigerator cold head;
the composite material flange structure comprises an oxygen-free copper structure layer and a stainless steel structure layer, the stainless steel structure layer and the condenser body jointly form a condenser cavity, and the oxygen-free copper structure layer and the stainless steel structure layer are welded in an explosion welding mode;
the oxygen-free copper structure layer comprises a first heat conduction main body part, and the stainless steel structure layer comprises a second heat conduction main body part and a welding flange;
the first heat conduction main body part and the second heat conduction main body part form an axial heat conduction path; the thickness of the first heat conduction main body part in the axial direction is d1, the thickness of the second heat conduction main body part in the axial direction is d2, and d2/d1 is 1/25-2/15;
the welding flange protrudes from the second heat conduction main body part towards the condenser cavity and is welded with the condenser body in an argon arc welding mode, so that the composite material flange structure is in sealing connection with the condenser body in a sealing mode; wherein the condenser body is made of stainless steel.
In another preferred embodiment, the GM refrigerator cold head is a single plane with a size of approximately 100cm 2 。
In another preferred embodiment, the first thermally conductive body portion is of cylindrical configuration.
In another preferred embodiment, d1 is 15mm to 25mm and d2 is 1mm to 2mm.
In another preferred example, an expansion fin structure is arranged in the condenser cavity, the expansion fin structure is made of oxygen-free copper, and the expansion fin structure is welded and connected with the second heat conduction main body part of the stainless steel structure layer in a vacuum brazing mode.
In another preferred example, the vacuum brazing material is a high silver brazing material or a nickel-based brazing material.
In another preferred example, the expansion fin structure includes a plurality of fins, the fin thickness is set between 3-4mm, the pitch of the fins is set between 4-5mm, and the height of the fins in the axial direction is set between 50-60 mm.
In another preferred example, the fin thickness is 4mm, the fin pitch is 4mm, and the fin height is 50mm.
In another preferred embodiment, the expansion fin structure is cylindrical.
In another preferred embodiment, the height of the welding flange in the axial direction is 8mm-10mm and the width in the radial direction is 3mm-4mm.
In another preferred embodiment, the welding flange is an annular flange formed by cutting inward a stainless steel plate.
In another preferred embodiment, the condenser body is entirely of a cylindrical structure having a wall thickness of 3mm to 4mm.
In another preferred embodiment, the side of the cylindrical structure is provided with an air inlet port, the air inlet port is configured to allow air to be condensed in the equipment to enter the condenser body, the bottom of the cylindrical structure is provided with a liquid return port, and the liquid return port is configured to allow liquid after condensation in the condenser cylinder to flow back to the equipment through gravity.
In another preferred embodiment, the oxygen-free copper structure layer further comprises a fixed connection part, and the fixed connection part is connected with the cold head connecting plate through a fastener.
In another preferred embodiment, the fastener is a bolt.
In another preferred embodiment, the bolts are stainless steel bolts, preferably with a strength rating of A2-70.
In another preferred embodiment, the fixed connection portion protrudes outward from a side surface of the first thermally conductive body portion of the oxygen-free copper structural layer.
In another preferred embodiment, the thickness of the fixed connection in the axial direction is 7mm-8mm.
In another preferred embodiment, the oxygen-free copper structural layer includes a first thermally conductive body portion having a first mounting hole disposed therein configured to receive a heating wire, and a second mounting hole configured to receive a temperature sensor. Preferably, the first mounting hole and the second mounting hole are at the same height in the axial direction. More preferably, the first mounting hole has a height of 6mm to 10mm in the axial direction, and the second mounting hole has a height of 2mm to 3mm in the axial direction.
In another preferred embodiment, the condenser body is further provided with a safety valve interface configured to connect a safety valve.
In another preferred embodiment, the condenser body is further provided with a pressure introduction port connected with a pressure gauge for facilitating control and parameter monitoring of the condenser, and an exhaust port configured to exhaust non-condensed gas.
A second aspect of the present application provides an ultra-low temperature system comprising a condenser as described above,
the vacuum heat-insulating device further comprises a GM refrigerator, a GM refrigerator cold head, a vacuum container and a vacuum multilayer heat-insulating structure, wherein the lowest working temperature of the GM refrigerator is minus 253 ℃, the cold head connecting plate, the composite material flange structure and the condenser body are arranged in the vacuum container and the vacuum multilayer heat-insulating structure, and the air tightness of the condenser is 1 multiplied by 10 -11 Pam 3 And/s, the vacuum degree in the vacuum container is 1×10 -3 pa or less.
A third aspect of the present application provides a method for preparing a condenser for GM refrigerator, comprising the steps of:
step S1: providing an oxygen-free copper plate and a stainless steel plate, and welding the oxygen-free copper plate and the stainless steel plate together through explosion welding so as to obtain a composite material plate;
step S2: cutting the oxygen-free copper layer structure of the composite material plate, and thinning the inner part of the stainless steel plate layer to obtain a composite material flange structure,
the composite material flange structure comprises an oxygen-free copper structure layer and a stainless steel structure layer, the oxygen-free copper structure layer comprises a first heat conduction main body part, the stainless steel structure layer comprises a second heat conduction main body part and a welding flange, the welding flange protrudes from the second heat conduction main body part towards the condenser cavity, and the first heat conduction main body part and the second heat conduction main body part form an axial heat conduction path; the thickness of the first heat conduction main body part in the axial direction is d1, the thickness of the second heat conduction main body part in the axial direction is d2, and d2/d1 is 1/25-2/15;
step S3: welding the expansion fin structure and the second heat conduction main body part together in a vacuum brazing mode;
step S4: and welding the welding flange and the condenser body together in an argon arc welding mode, so that a closed condenser cavity formed by the stainless steel structural layer and the condenser body together is obtained.
In another preferred example, in step S2, cutting and hole digging may be further performed on the oxygen-free copper layer structure of the composite material plate, so that a first mounting hole and a second mounting hole are disposed in the first heat conducting main body portion of the oxygen-free copper layer structure of the composite material flange structure, the first mounting hole being configured to accommodate a heating wire, and the second mounting hole being configured to accommodate a temperature sensor.
In another preferred embodiment, the oxygen-free copper structure layer of the composite flange structure formed in step S2 further includes a fixed connection portion protruding outward from a side surface of the first heat conductive main body portion of the oxygen-free copper structure layer.
In another preferred embodiment, the method further comprises step S5: and fixedly connecting the fixed connection part with the cold head connecting plate by using a fastener, thereby obtaining the condenser for the GM refrigerator.
It is understood that within the scope of the present invention, the above-described technical features of the present invention and technical features specifically described below (e.g., in the examples) may be combined with each other to constitute new or preferred technical solutions. And are limited to a space, and are not described in detail herein.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is to be understood that the drawings described below are merely examples of embodiments of the present invention and that other embodiments may be made by those skilled in the art without inventive effort.
Fig. 1 is a schematic structural view of a condenser for GM refrigerator according to an embodiment of the present application;
FIG. 2a is a schematic structural view of an oxygen free copper plate and stainless steel plate without explosion welding according to an embodiment of the present application;
FIG. 2b is a schematic structural view of a composite sheet formed of explosion welded oxygen free copper sheet and stainless steel sheet according to an embodiment of the present application;
FIG. 2c is a schematic structural view of a composite sheet being preliminarily machined according to one embodiment of the present application;
FIG. 2d is a schematic structural view of a composite flange structure (i.e., a composite plate that has been machined) according to an embodiment of the present application;
FIG. 3 is a schematic structural view of a composite flange structure and an extended fin structure braze welding in accordance with an embodiment of the present application;
FIG. 4 is a schematic view of a composite flange structure and a condenser body argon arc welded structure according to an embodiment of the present application, wherein an expansion fin structure is disposed in a condenser cavity;
fig. 5 is a schematic structural view of an extended fin structure of a condenser for GM refrigerator according to an embodiment of the present application.
In the drawings, the marks are as follows:
1-cold head connecting plate
2-heat conduction pressure-bearing structure
21-oxygen-free copper structure layer
211-first thermally conductive body portion
212-fixed connection
22-stainless steel structural layer
221-second thermally conductive body portion
222-welding flange
23-bolt hole
24-first mounting hole
25-second mounting hole
3-condenser body
4-fastener
5-expansion fin structure
6-air inlet connector
7-liquid return port
8-safety valve interface
9-lead crimping
10-exhaust interface
Detailed Description
Through extensive and intensive research, the present inventors have developed, for the first time, a condenser for GM refrigerator, which can be applied to refrigeration scenes (for example, purification of electric special gases such as high-purity xenon and high-purity neon) in the chemical fields such as precision rectification, etc., wherein the GM refrigerator provides cold energy for the condenser, and condenses gas entering from an air inlet port into liquid, thereby realizing process requirements; according to the condenser for the GM refrigerator, through a manufacturing process of explosion welding, a main body bearing member made of an oxygen copper material is provided with a stainless steel sealing layer with the thickness of 1-2 mm; the design enables the condenser to obtain excellent heat conduction performance and excellent sealing performance. Meanwhile, the structural design ensures that the condenser has a complete stainless steel liner sealing layer (the stainless steel structural layer of the composite material flange structure and the condenser body form a condenser cavity through argon arc welding), and the same material has the same linear expansion coefficient, so that the condenser has excellent temperature alternating resistance, can perform multiple high-low temperature alternating working conditions, reduces leakage risk in the long-term running process of equipment, and improves the stable running performance of the equipment.
Terminology
It should be noted that in the present patent application, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. In the present patent application, if it is mentioned that an action is performed according to an element, it means that the action is performed at least according to the element, and two cases are included: the act is performed solely on the basis of the element and is performed on the basis of the element and other elements. Multiple, etc. expressions include 2, 2 times, 2, and 2 or more, 2 or more times, 2 or more.
In the present invention, all directional indications (such as up, down, left, right, front, rear, etc.) are merely used to explain the relative positional relationship, movement conditions, etc. between the components under a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly.
Principal advantages of the present application
(a) Because the GM refrigerator is limited by equipment, the size of a cold head is a single plane, the area of the GM refrigerator is smaller, the temperature control is difficult and the GM refrigerator is difficult to directly use, the GM refrigerator condenser is designed into a composite material plate with certain strength and oxygen-free copper and stainless steel in an explosion welding mode, so that the GM refrigerator condenser is matched with the GM refrigerator cold head, the GM refrigerator condenser has good sealing performance and can operate at extremely low temperature, the minimum temperature can reach 20K, and at low temperature of 20K, still more than 20W of refrigerating capacity can be used, and the design boundary of a process is improved;
(b) The welding mode is adopted for the whole condenser for the GM refrigerator, the composite material flange structure comprising the oxygen-free copper structural layer and the stainless steel structural layer is subjected to explosion welding, and the stainless steel structural layer (serving as a sealing connecting part) and the stainless steel condenser body are subjected to argon arc welding, so that the whole cavity (the liner of the condenser) of the condenser is the stainless steel layer, the air tightness can be ensured, the leakage risk in the long-term operation process of equipment is reduced, and the stable operation performance of the equipment is improved;
(c) The whole cavity (the liner of the condenser) of the condenser for the GM refrigerator is a stainless steel layer, the thickness of the cavity of the condenser is designed to enable the condenser to operate under the design pressure within 2Mpa, and the thickness of the oxygen-free copper structural layer of the composite material flange structure is designed to bear a certain pressure, so that the pressure intensity requirement of the whole condenser for the GM refrigerator is met;
(d) In the composite material flange structure of the GM refrigerator condenser, the oxygen-free copper structural layer is a heat conduction and pressure-bearing member, the stainless steel layer is a sealing member, and on the heat conduction path of the condenser, the stainless steel layer with the thickness of 1mm is all made of oxygen-free copper, so that the heat transfer performance of the condenser can be improved, the heat transfer temperature difference can be reduced, and the temperature control is convenient;
(e) The GM refrigerator condenser of the present invention can be applied to the refrigeration field of chemical fields such as precision rectification (e.g., electric gas purification (liquid helium, liquid neon, and liquid xenon)/Gao Chunte gas low-temperature lossless storage (liquid helium, liquid xenon));
(f) The parts of the condenser for the GM refrigerator are assembled together in a manner of explosion welding, argon arc welding and vacuum brazing, and the explosion welding is performed outside; the vacuum brazing can not cause pollution in the condenser, and the problems of welding slag waste and oxide skin are avoided; the argon arc welding adopts a double-sided argon arc protection mode, and can also ensure that a welded junction is not oxidized, so that the whole interior of the condenser is clean, no oxide layer exists, the interior gas can not be polluted, the interior cleanliness can be ensured, and the purity requirement of high-purity gas or electron special gas is met.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be understood by those skilled in the art that the claimed invention may be practiced without these specific details and with various changes and modifications from the embodiments that follow.
Explosive welding
The important part of the condenser for the GM refrigerator, namely the composite material flange structure 2, is manufactured by processing a composite material plate formed by combining a stainless steel plate and an oxygen-free copper plate in an explosive welding mode.
The explosion welding technology is to obtain instant ultrahigh pressure and ultrahigh speed impact through explosive detonation so as to form metal collision jet flow, push one material (stainless steel layer in the application) to collide with the other material (oxygen-free copper layer in the application) in a high-speed inclined manner, and realize metallurgical bonding of two metals.
The seam of explosion welding can achieve molecular grade bonding, the bonding degree between the base layer and the multiple layers can reach 100%, and the seam has no contact thermal resistance and gaps, and has unique advantages in the aspect of dissimilar metal surface welding.
Condenser for GM refrigerator
Referring to fig. 1, the present application provides a condenser for GM refrigerator, comprising:
a cold head connection plate 1, a composite material flange structure 2 and a condenser body 3, wherein the cold head connection plate 1 is configured to be connected with a cold head of a GM refrigerator;
referring to fig. 2d and fig. 4, the composite flange structure 2 includes an oxygen-free copper structure layer 21 and a stainless steel structure layer 22, the stainless steel structure layer 22 and the condenser body 3 together form a condenser cavity, and the oxygen-free copper structure layer 21 and the stainless steel structure layer 22 are welded by means of explosion welding;
the oxygen-free copper structure layer 21 comprises a first heat conduction main body part 211 and a fixed connection part 212, and the stainless steel structure layer 22 comprises a second heat conduction main body part 221 and a welding flange 222;
the first heat conductive body portion 211 and the second heat conductive body portion 221 constitute an axial heat conductive path; the thickness of the first heat conductive body 211 in the axial direction is d1, and the thickness of the second heat conductive body 221 in the axial direction is d2, wherein d2/d1 is 1/25-2/15;
the welding flange 222 protrudes from the second heat-conducting main body 221 towards the condenser cavity and is welded with the condenser body 3 by argon arc welding, so that the composite material flange structure 2 is in sealed connection with the condenser body 3; wherein the condenser body 3 is made of stainless steel. Preferably, d1 is 15mm-25mm, the thickness needs to meet the pressure-bearing strength requirement inside the condenser, d2 is 1mm-2mm, through calculation, the structural design of the composite material is compared with the structural design that the materials of the composite material flange structure 2 are all oxygen-free copper, the heat conduction performance reduction degree of the composite material of the two materials is very little, but the stainless steel structure layer 22 of the composite material flange structure 2 and the condenser body 3 are welded together in an argon arc welding mode, so that the condenser is provided with a complete stainless steel liner layer, the air tightness and the reliability of the condenser are greatly improved, and the design has unique advantages.
In an embodiment, the thickness d1 of the first heat-conducting main body 211 of the composite flange structure oxygen-free copper structural layer 21 is 24mm, the thickness d2 of the second heat-conducting main body 221 of the stainless steel structural layer 22 is 1mm, and on the heat-conducting channel, a part of thermal resistance is increased relative to the oxygen-free copper structure with the whole thickness of 25mm, when the GM refrigerator works in a temperature zone of 77K, the refrigerating power is reduced by 5% under the same condition, but the stainless steel structural layer 22 and the condenser body 3 are welded together by argon arc welding, so that the condenser has a complete stainless steel liner layer, the air tightness and reliability of the condenser are greatly improved, and the air tightness can reach 1×10 -11 Pam 3 /s。
In one embodiment, the weld flange 222 is an annular flange formed from stainless steel plate to be cut inwardly. The height of the welding flange 222 in the axial direction is 8mm to 10mm, and the welding flange 222 and the second heat conductive body part 221 smoothly transition through rounded corners, thus reducing stress concentration.
The width of the welding flange 222 in the radial direction is 3mm-4mm. The whole condenser body 3 is of a cylindrical structure, and the wall thickness of the cylindrical structure is 3mm-4mm. The thickness of the welding flange 222 and the thickness of the wall of the condenser body 3 are designed to satisfy the pressure intensity requirement of the condenser for the whole GM refrigerator together with the design that the thickness d1 of the first heat conductive main body 211 of the oxygen-free copper structure layer 21 is 15mm-25 mm.
In an embodiment, the fixing connection portion 212 protrudes outwards from the side surface of the first heat conductive main body portion 211 of the oxygen-free copper structure layer 21, and the fixing connection portion 212 is connected to the cold head connection plate 1 through a fastener 4. The fastening piece is a bolt, the bolt is a stainless steel bolt, preferably, the strength grade of the bolt is A2-70, and the thickness of the fixed connection part in the axial direction is 7-8 mm, so that the fixed connection part 212 achieves stable connection of the cold head connecting plate 1 and the composite material flange structure 2.
Ultra-low temperature system comprising the above-mentioned condenser
The system comprises the condenser for the GM refrigerator, a GM refrigerator cold head, a vacuum container and a vacuum multilayer heat insulation structure, wherein the minimum working temperature of the GM refrigerator is-196 ℃, the cold head connecting plate 1, the composite material flange structure 2 and the condenser body 3 are arranged in the vacuum container and the vacuum multilayer heat insulation structure, and the air tightness of the condenser is 1 multiplied by 10 -11 Pam 3 And/s, the vacuum degree in the vacuum container is 1×10 -3 pa or less.
Because the welding flange 222 of the stainless steel structural layer 22 of the composite material flange structure 2 is welded with the stainless steel condenser body 3 by argon arc welding, the composite material flange structure 2 and the condenser body 3 are in sealed connection, thereby forming a sealed space (condenser cavity) formed by the stainless steel structural layer 22 and the condenser body 3 together, and the air tightness of the sealed space can reach 1 multiplied by 10 -11 Pam 3 And/s. Further, the vacuum multi-layer heat insulation structure is arranged to control the vacuum degree in the vacuum container to be 1×10 -3 pa, vacuum insulation is achieved.
Method for preparing condenser for GM refrigerator
The present application provides a method for preparing a condenser for GM refrigerator, wherein fig. 2 a-2 d and fig. 3-4 show a process for preparing a condenser for GM refrigerator, specifically comprising the steps of:
step S1: providing an oxygen-free copper plate and a stainless steel plate (see fig. 2 a), and welding the oxygen-free copper plate and the stainless steel plate together by explosion welding to obtain a composite plate (see fig. 2 b);
step S2: cutting the oxygen-free copper layer structure of the composite plate (see fig. 2 c) and thinning the interior of the stainless steel plate layer, thereby obtaining a composite flange structure 2 (see fig. 2 d), wherein the composite flange structure 2 comprises an oxygen-free copper structure layer 21 and a stainless steel structure layer 22, the oxygen-free copper structure layer 21 comprises a first heat conducting body portion 211, the stainless steel structure layer 22 comprises a second heat conducting body portion 221 and a welding flange 222, the welding flange 222 protrudes from the second heat conducting body portion 221 towards the condenser cavity, and the first heat conducting body portion 211 and the second heat conducting body portion 221 form an axial heat conducting path; the thickness of the first heat conductive body portion 211 in the axial direction is d1, and the thickness of the second heat conductive body portion 221 in the axial direction is d2, wherein d2/d1 is 1/25-2/15 (see fig. 2 d);
step S3: welding the expansion fin structure 5 and the second heat conductive body part 221 together by vacuum brazing (see fig. 3);
step S4: the welding flange 222 and the condenser body 3 are welded together by argon arc welding, so as to obtain a closed condenser cavity formed by the stainless steel structural layer 22 and the condenser body 3 (see fig. 4).
Preferably, in step S2, cutting and hole-digging the oxygen-free copper layer structure of the composite material plate may be further included, such that a first mounting hole 24 configured to accommodate a heating wire and a second mounting hole 25 configured to accommodate a temperature sensor are provided in the first heat conductive main body portion 211 of the oxygen-free copper layer structure 21 of the composite material flange structure 2, wherein fig. 2d can be seen.
Preferably, the oxygen-free copper structure layer 21 of the composite flange structure 2 formed in step S2 further includes a fixed connection portion 212, and the fixed connection portion 212 protrudes outward from the side surface of the first heat conductive main body portion 211 of the oxygen-free copper structure layer 21. Preferably, a bolt hole 23 may be provided at the fixed connection 212.
Preferably, the method further comprises step S5: the fixed connection 212 is fixedly connected to the cold head connection plate 1 through the bolt hole 23 using the fastener 4, thereby obtaining the condenser for GM refrigerator.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. It should be understood that these are merely examples of what the reader may take and are not intended to limit the scope of the invention.
Examples
Referring to fig. 1, the present application provides a condenser for GM refrigerator, the condenser for GM refrigerator comprising: a cold head connecting plate 1, a composite material flange structure 2 and a condenser body 3, wherein the cold head connecting plate 1 is connected with a cold head of the GM refrigerator, the composite material flange structure 2 is positioned above the cold head connecting plate, the condenser body 3 is positioned below the cold head connecting plate, and the composite material flange structure 2 and the condenser body 3 jointly form a condenser cavity, a fastening part 4, an expansion fin structure 5, an air inlet interface 6, a liquid return port 7, a safety valve interface 8, a pressure guiding port 9 and an exhaust interface 10; the liquid return port 7 is arranged at the bottom of the condenser cavity, the cold head of the GM refrigerator provides cold energy, gas to be condensed in the condenser cavity entering from the air inlet port 6 is condensed into liquid, and the liquid is discharged from the liquid return port 7 through gravity to the condenser cavity, so that the process requirement is further realized. In this embodiment, the gas to be condensed may be liquid helium, liquid neon or liquid xenon. In this embodiment, the GM refrigerator cold head is a single plane with a size of approximately 100cm 2 。
The cold head connecting plate 1 can be mounted on a GM refrigerator cold head mounting hole site through bolts. The composite flange structure 2 is then mounted on the coldhead connection plate 1 by fasteners 4. The cold head connecting plate 1 is made of oxygen-free copper and has the thickness of 5mm. The upper and lower parts of the cold head connecting plate 1 are coated with heat conduction silicone grease, so that the heat conduction performance of the equipment is improved. The fastener 4 is a bolt.
The composite flange structure 2 is obtained by explosion welding together a stainless steel plate and an oxygen-free copper plate, and then forming the required flange shape by machining. Wherein, the stainless steel plate is thinner, and the thickness of the base material is 11mm; the oxygen-free copper plate is thicker, and the thickness of the base material is 26mm.
Specifically, the oxygen-free copper plate portion of the composite material plate is processed (outside processed) to form the fixed connection portion 212; the groove is milled in the stainless steel plate, the residual thickness of the stainless steel is controlled to be 1-2mm (the thinnest part is 1-2 mm), the welding long neck (namely the welding flange 222) is reserved in the outer part, the height of the welding long neck is 8-10 mm, and the root is rounded.
That is, as shown in fig. 2d of the present application, the composite flange structure 2 includes an oxygen-free copper structure layer 21 and a stainless steel structure layer 22, the oxygen-free copper structure layer 21 including a first heat conductive main body portion 211 and a fixed connection portion 212; the stainless steel structural layer 22 and the condenser body 3 together form a condenser cavity. In the present embodiment, the first heat conductive body portion 211 has a cylindrical structure, and the fixed connection portion 212 protrudes outward from the cylindrical surface of the first heat conductive body portion 211. The stainless steel structural layer 22 includes a second thermally conductive body portion 221 and a weld flange 222; the welding flange 222 protrudes from the second heat-conducting main body part 221 towards the condenser cavity and is welded with the condenser body 3 by argon arc welding, so that the composite material flange structure 2 is in sealing connection with the condenser body 3.
The thickness d2 of the second heat conducting main body 221 of the stainless steel structural layer 22 in the axial direction is 1-2mm, so that a complete stainless steel liner of the condenser is obtained, the thickness d1 of the first heat conducting main body 211 of the oxygen-free copper structural layer 21 is 15-25mm, and the strength of the condenser is ensured. In the present embodiment, the second heat conductive body part 221 has a cylindrical structure. Namely, the pressure resistance of the condenser is ensured by the thickness of the first heat conduction main body part 211 of the oxygen-free copper structural layer 21, and the stainless steel inner container formed by welding the first heat conduction main body part 211 of the oxygen-free copper structural layer 21 and the condenser body 3 together in an argon arc welding mode is integrated, so that the air tightness of the condenser is ensured.
The fixed connection 212 is used for connecting and fixing the condenser and the GM refrigerator. Namely, the cold head connecting plate 1 is fixedly connected with the composite material flange structure 2. The fixed connection portion 212 is provided with a 1mm boss at the connection portion with the first heat conduction main body portion 211, that is, a 1mm boss chamfer is formed on one surface of the joint portion with the GM cold head connecting plate, so that the joint portion between the first heat conduction main body portion 2112 and the cold head connecting plate 1 surface after the bolt is locked is more compact, and the contact thermal resistance is reduced (see fig. 2 d). The thickness of the fixing connection portion 212 in the axial direction is 7mm to 8mm, which is 1 to 2mm higher than the height of the corresponding nut, so that the container can be installed without interference.
Referring to fig. 3 and 5, the expansion fin structure 5 is cylindrical as a whole, and a plurality of expansion fins are arranged in the middle of the expansion fin structure, so that the heat exchange area of the condenser is increased, and the refrigeration performance and the tolerance capability to non-condensing steam of the condenser are improved. The fin thickness of the expansion fin was 4mm, the fin pitch was 4mm, and the fin height (in the axial direction) was 50mm. The expansion fin structure 5 is integrally formed by CNC (computer numerical control) integral processing.
The expansion fin structure 5 and the composite material flange structure 2 are designed to be provided with positioning pins for determining the installation accuracy of the expansion fin structure and the composite material flange structure. The expansion fins are made of oxygen-free copper and are welded with the stainless steel structural layer 22 of the composite material flange structure 2 in a brazing mode. The solder can be silver-based solder, and the heat conducting property between the silver-based solder and the solder is enhanced.
During welding, the oxygen-free copper and the stainless steel are welded in a vacuum brazing mode, welding slag and an oxide layer are not formed at the welding seam, and the surface of the welding seam can be clean. The oxygen-free copper and stainless steel can be subjected to fine grinding and electrochemical polishing treatment before welding. The condenser has high internal cleanliness after the whole processing is finished, can not pollute internal gas, and can be used for a high-purity gas production process.
Referring to fig. 4, the composite material flange structure 2 and the condenser body 3 are welded together through argon arc welding, and as the composite material flange structure and the condenser body are made of stainless steel materials and have the same linear expansion coefficient, the condenser can bear high-low temperature alternating working conditions, the air tightness of equipment is ensured, the leakage rate of the equipment is ensured, that is, gas leakage can not occur even under long-term operation, and the stable operation performance of the equipment is improved.
Wherein, the main part of the composite flange structure 2 (namely the oxygen-free copper structure layer 21) is made of oxygen-free copper material. On the heat conduction bridge, except oxygen-free copper materials, only 1-2mm stainless steel structural layers are arranged, and the overall heat conduction performance of the condenser is good.
Because the electric power of the GM refrigerator is fixed, the refrigerating power of the GM refrigerator cannot be regulated, and therefore, in order to meet the process requirement, the condensing power and the temperature of the condenser can be controlled in a heating compensation mode. Referring to fig. 2d, on the oxygen-free copper structure layer 21 side, first mounting holes 24 and second mounting holes 25 are machined. Wherein, the first mounting hole size is 6mm 60mm, and the second mounting hole size is 3mm 20mm. A 50W heating wire is arranged in the first mounting hole 24, and a temperature sensor is arranged in the second mounting hole 25.
The whole condenser body 3 is of a cylindrical structure, and a liquid return port 7 is arranged at the bottom of the cylindrical structure; the safety valve interface 8, the pressure guiding interface 9 and the exhaust interface 10 are arranged on the side surface of the condenser body 3, as described above, gas enters the condenser from the air inlet interface 6 and is condensed into liquid in the condenser, the liquid return interface 7 is arranged at the lowest part of the cavity of the condenser, the liquid can completely flow out of the condenser through gravity, and no liquid remains in the condenser so as to meet the requirements in terms of technology.
It should be noted that the composition of the gas entering the condenser may vary, and may contain trace amounts of gases having very low liquefaction temperatures, such as nitrogen and hydrogen. The condenser cannot liquefy it at its normal operating temperature. It is necessary to vent this portion of non-condensable gases through the vent interface 10. Since non-condensing water often collects at the top of the condenser, it is preferable to provide a vent at the top of the condenser. Preferably, the position distance of the exhaust interface 10 is 5mm-10mm close to the fin root of the expansion fin structure 5, and non-condensable gas can be simultaneously discharged during exhaust, so that the stable operation of the condenser is ensured.
The safety valve interface 8 is configured to be connected with a safety valve, when the GM refrigerator fails, or the heating wire cannot be closed, and the like, the condenser cannot liquefy the gas entering the GM refrigerator in time, the pressure of the gas continuously increases, and the safety valve is arranged so that equipment is not damaged when the pressure of the system increases. The pressure gauge is connected to the pressure leading port 9 to facilitate control and parameter monitoring of the condenser.
Because the condenser adopts the GM refrigerator to provide the cold source, the working temperature of the condenser is very low, the lowest working temperature of the GM refrigerator is-196 ℃, the embodiment of the application also provides an ultralow temperature system comprising the condenser, the system also comprises the GM refrigerator, a cold head of the GM refrigerator, a vacuum container and a vacuum multilayer heat insulation structure, and the whole structures such as the cold head connecting plate 1, the composite material flange structure 2, the condenser body 3 and the like are arranged in the vacuum container, because the excellent air tightness of the condenser of the application can reach 1 multiplied by 10 as described above -11 Pam 3 As a result, the vacuum degree in the vacuum vessel is controlled to be 1X 10 by arranging the vacuum multi-layer heat insulation structure -3
And below pa, vacuum insulation is realized, the heat preservation effect of the condenser is improved, heat leakage is reduced, the working stability of the condenser is enhanced, and the influence of the outside air temperature is avoided.
Comparative example
In this embodiment, the composite flange structure 2 is obtained by welding together a stainless steel plate and an oxygen-free copper plate by means of vacuum brazing, and then forming the desired flange shape by machining.
In this example, the vacuum brazing is performed with high accuracy on the brazing surface, and the brazing surface is formed in a large area (100 cm 2 The brazing area of the welding method only reaches 60-70% of the whole area under the surface welding condition, and the welding strength is much worse than that of explosion welding.
In the present application, a number of technical features are described in the specification, and are distributed in each technical solution, which makes the specification too lengthy if all possible combinations of technical features (i.e. technical solutions) of the present application are to be listed. In order to avoid this problem, the technical features disclosed in the above summary of the present application, the technical features disclosed in the following embodiments and examples, and the technical features disclosed in the drawings may be freely combined with each other to constitute various new technical solutions (these technical solutions are all regarded as being already described in the present specification) unless such a combination of technical features is technically impossible. For example, in one example, feature a+b+c is disclosed, in another example, feature a+b+d+e is disclosed, and features C and D are equivalent technical means that perform the same function, technically only by alternative use, and may not be adopted simultaneously, feature E may be technically combined with feature C, and then the solution of a+b+c+d should not be considered as already described because of technical impossibility, and the solution of a+b+c+e should be considered as already described.
All documents mentioned in the present application are considered to be included in the disclosure of the present application in their entirety, so that they may be subject to modification if necessary. Further, it will be understood that various changes or modifications may be made to the present application by those skilled in the art after reading the foregoing disclosure of the present application, and such equivalents are intended to fall within the scope of the present application as claimed.
Claims (10)
1. A condenser for GM refrigerator, comprising:
a cold head connecting plate (1), a composite material flange structure (2) and a condenser body (3), wherein the cold head connecting plate (1) is configured to be connected with a GM refrigerator cold head;
the composite material flange structure (2) comprises an oxygen-free copper structure layer (21) and a stainless steel structure layer (22), the stainless steel structure layer (22) and the condenser body (3) jointly form a condenser cavity, and the oxygen-free copper structure layer (21) and the stainless steel structure layer (22) are welded in an explosive welding mode;
the oxygen-free copper structure layer (21) comprises a first heat conduction main body part (211), and the stainless steel structure layer (22) comprises a second heat conduction main body part (221) and a welding flange (222);
the first thermally conductive body portion (211) and the second thermally conductive body portion (221) constitute an axial thermally conductive path; the thickness of the first heat conduction main body part (211) in the axial direction is d1, the thickness of the second heat conduction main body part (221) in the axial direction is d2, and d2/d1 is 1/25-2/15;
the welding flange (222) protrudes from the second heat-conducting main body part (221) towards the condenser cavity and is welded with the condenser body (3) in an argon arc welding mode, so that the composite material flange structure (2) is in sealed connection with the condenser body (3); wherein the condenser body (3) is made of stainless steel.
2. The condenser of claim 1, wherein d1 is 15mm to 25mm and d2 is 1mm to 2mm.
3. The condenser according to claim 2, wherein an expansion fin structure (5) is disposed in the condenser cavity, the expansion fin structure (5) is made of oxygen-free copper, and the expansion fin structure (5) and the second heat conducting main body portion (221) of the stainless steel structure layer (22) are welded and connected in a vacuum brazing manner.
4. A condenser according to claim 3, wherein the height of the welding flange (222) in the axial direction is 8-10 mm and the width in the radial direction is 3-4 mm.
5. A condenser according to claim 4, characterized in that the condenser body (3) is of a cylindrical structure as a whole, the wall thickness of the cylindrical structure being 3mm-4mm.
6. A condenser according to claim 5, characterized in that the cylindrical structure is provided with an inlet air interface (6) on the side, the inlet air interface (6) being configured for the air to be condensed in the device to enter the condenser body, the bottom of the cylindrical structure being provided with a liquid return opening (7), the liquid return opening (7) being configured for the liquid after condensation in the condenser cylinder to flow back to the device by gravity.
7. The condenser according to claim 1, wherein the oxygen-free copper structure layer (21) further comprises a fixed connection (212), the fixed connection (212) being connected to the cold head connection plate (1) by means of a fastener (4).
8. The condenser according to claim 7, wherein the fixed connection (212) protrudes outwards from the side of the first thermally conductive body portion (211) of the oxygen-free copper structure layer (21).
9. An ultra-low temperature system comprising a condenser according to any one of claims 1-8,
the solar energy heat-insulating vacuum condenser further comprises a GM refrigerator, a GM refrigerator cold head, a vacuum container and a vacuum multilayer heat-insulating structure, wherein the lowest working temperature of the GM refrigerator is minus 253 ℃, the cold head connecting plate (1), the composite material flange structure (2) and the condenser body (3) are arranged in the vacuum container and the vacuum multilayer heat-insulating structure, and the air tightness of the condenser is 1 multiplied by 10 -11 Pam 3 And/s, the vacuum degree in the vacuum container is 1×10 -3 pa or less.
10. A method of making a condenser for a GM refrigerator, comprising the steps of:
step S1: providing an oxygen-free copper plate and a stainless steel plate, and welding the oxygen-free copper plate and the stainless steel plate together through explosion welding so as to obtain a composite material plate;
step S2: cutting the oxygen-free copper layer structure of the composite material plate, and thinning the inner part of the stainless steel plate layer to obtain a composite material flange structure (2),
wherein the composite material flange structure (2) comprises an oxygen-free copper structural layer (21) and a stainless steel structural layer (22), the oxygen-free copper structural layer (21) comprises a first heat conducting main body part (211), the stainless steel structural layer (22) comprises a second heat conducting main body part (221) and a welding flange (222), the welding flange (222) protrudes from the second heat conducting main body part (221) towards the condenser cavity, and the first heat conducting main body part (211) and the second heat conducting main body part (221) form an axial heat conducting path; the thickness of the first heat conduction main body part (211) in the axial direction is d1, the thickness of the second heat conduction main body part (221) in the axial direction is d2, and d2/d1 is 1/25-2/15;
step S3: welding the expansion fin structure (5) and the second heat conducting main body part (221) together by means of vacuum brazing;
step S4: and welding the welding flange (222) and the condenser body (3) together in an argon arc welding mode, so that a closed condenser cavity formed by the stainless steel structural layer (22) and the condenser body (3) is obtained.
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| CN116538760A (en) * | 2023-04-26 | 2023-08-04 | 北京空间机电研究所 | Mechanical refrigeration auxiliary cooling system |
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| KR20040001073A (en) * | 2002-06-26 | 2004-01-07 | 주식회사 덕성 | A cryovessel with the gm cryocooler and controlling method thereof |
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