CN1299038C - Copper-aluminium combined pipeline for refrigerating system and its preparing method - Google Patents
Copper-aluminium combined pipeline for refrigerating system and its preparing method Download PDFInfo
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- CN1299038C CN1299038C CNB2005100424955A CN200510042495A CN1299038C CN 1299038 C CN1299038 C CN 1299038C CN B2005100424955 A CNB2005100424955 A CN B2005100424955A CN 200510042495 A CN200510042495 A CN 200510042495A CN 1299038 C CN1299038 C CN 1299038C
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- pipe
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- aluminum pipe
- weld
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- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title abstract description 17
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 80
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 79
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 74
- 229910052802 copper Inorganic materials 0.000 claims abstract description 74
- 239000010949 copper Substances 0.000 claims abstract description 74
- 238000003466 welding Methods 0.000 claims abstract description 70
- 238000002360 preparation method Methods 0.000 claims abstract description 12
- 238000003491 array Methods 0.000 claims description 4
- 239000010410 layer Substances 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 239000011241 protective layer Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims 2
- 238000005057 refrigeration Methods 0.000 abstract description 36
- 239000004411 aluminium Substances 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000004927 fusion Effects 0.000 abstract description 5
- 230000001590 oxidative effect Effects 0.000 abstract 1
- 239000003507 refrigerant Substances 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000005476 soldering Methods 0.000 description 5
- 230000002950 deficient Effects 0.000 description 4
- 210000001503 joint Anatomy 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910017767 Cu—Al Inorganic materials 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 235000008429 bread Nutrition 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000003755 preservative agent Substances 0.000 description 2
- 230000002335 preservative effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- -1 is to rely on import Chemical compound 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008685 targeting Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The present invention relates to a copper-aluminium combined pipeline for a refrigerating system, and a preparing method thereof. The copper-aluminium combined pipeline is characterized in that a welding part on the end of a copper pipe is processed into a straight pipe guiding part and a latter welding surface thereof, wherein the outer diameter of the straight pipe guiding part is slightly smaller than the inner diameter of an aluminum pipe, and the copper pipe and the aluminum pipe are respectively fixed to a movable electrode and a fixed electrode of a pressure welding machine; then, the copper pipe is moved and inserted into the aluminum tube by the pressure welding machine, the electrodes are energized when an oxidizing layer on the wall of the flexible aluminum pipe is ground by the tapered welding surface of the hard copper pipe in the splicing process until the welding surface of the copper pipe enters the aluminium pipe, a power supply is switched off, and the preparation of the copper-aluminium combined pipeline or pipe fittings can be completed. Therefore, the present invention can produce a system pipe having the advantages of low cost, high compactness and high cleanness, the present invention is especially suitable for refrigeration pipeline systems using refrigerant as cool carrying media and has good welding quality and wide fusion surfaces, the radial dimension of the appearance of the joint of the system pipe is consistent, clear is not needed after welding, and the welding length of the pipeline is not limited.
Description
Technical field
The present invention relates to the combined pipeline preparation method of a kind of aluminum pipe, copper pipe, i.e. refrigeration system with Cu-Al combination piping and its preparation method.
Background technique
Refrigeration agent is the operation material that carries out refrigeration cycle in refrigeration plant, and in the circulating pipe system that carries cold medium, refrigeration is relevant with the content of refrigeration agent with refrigeration agent, crosses to exceed to hang down all can not reach best refrigeration.Obviously, in the running, the refrigeration agent in the system reduces, and refrigeration will be affected.The penetrability defective will cause the refrigeration agent seepage on the tubing or on the soldering point, this defective is impossible self-healing, the refrigeration agent of missing can't be regenerated, even cause the so small defective of 0.5g/ leakage quantity finally all can cause the refrigeration product not freeze, the penetrability defective takes place can only be remedied by the mode of maintenance, for this product of user is exactly reject, so the welding method of the tie point of compactness, the especially pipeline of necessary assurance pipeline wants reliable.
In addition, compressor extracts the refrigeration agent of gaseous state from vaporizer, if impurity is arranged on the pipeline inner wall, these impurity will enter into compressor in company with refrigeration agent, influence the compressor operating effect, even cause seize damage compressor, so on technology, guarantee the cleanliness of pipeline during the processing refrigeration pipe system.
Copper pipe is the pipe fitting of easy soldering, realizes the connection between the pipeline easily, and comparatively speaking, aluminum pipe is then much more difficult; The price of the relative copper pipe of aluminum pipe is very cheap; The soft easy crooked shaping of soft attitude copper pipe, aluminum pipe also has this advantage; Refrigeration pipe is less demanding to intensity, aluminum pipe intensity be enough to satisfy the pressure of system.For bringing into play two kinds of materials advantage separately, be necessary to study the preparation method of copper-aluminium combined line structure, especially solve the Welding Problems of copper aluminum pipe.Refrigerator, the more method of refrigerator industry copper Al pipe butt welding application are friction welding and stored energy welding at present, and provide the copper-aluminium transition joint that length is no more than 200mm, production of copper aluminium transit joint rather than direct copper and aluminium welding is connected together are subjected to the restriction of friction welding and stored energy welding method, reason is as follows: a. inner and outer surface that a kind of special-purpose soldering flux of use spreads upon pipeline before implementing friction welding and stored energy welding welding prevents that the spatter thing is stained with and is bonded on the tube wall, need to increase washing process after the welding and clear up these and remain in soldering flux on the workpiece, can't operate long pipe runs.What b. friction welding and stored energy welding were adopted is flat mouthful butt joint, and transient heating and upset make the inner and outer surface of welding back weld seam produce sharp-pointed burr, must clear up one by one after the welding.Workpiece length is restricted.Copper-aluminium transition joint of every use will increase by 1 soldering point in the system, thereby has influenced the popularization of copper-aluminium combined pipeline in other products.
Also have, because flat mouthful of butt joint adopted in friction welding and stored energy welding, joint compactness is relevant with the pipeline wall thickness of employing, and tube wall is thin more, and the joint compactness is just poor more.When using aluminum pipe in refrigerator, refrigerator, the main foundation of selected thickness is friction welding and the stored energy welding requirement to pipe thickness, but not the desired requirement of strength of product causes waste of material.Even like this, the welding disqualification rate of friction welding, stored energy welding has also reached 1000ppm, and is obviously very undesirable in mass production.
Summary of the invention
The objective of the invention is to realize to replace copper pipe based on the copper aluminum pipe composite structure of aluminum pipe, the processing refrigeration system pipeline, i.e. refrigeration system with Cu-Al combination piping and its preparation method is to overcome the deficiency of prior art.
This is based on a large amount of refrigeration pipe system that is applied to refrigeration industry of copper pipe, and in the cost of raw of refrigeration product, copper material has accounted for sizable part.The tubing of same specification, the price of copper pipe are 5-6 times of aluminum pipe price.Because two kinds of materials of copper aluminium are approaching on performance index such as ductility, thermal conductivity, and the bauxite resource of China is abundant, the copper scarcity of resources, and the source of copper mainly is to rely on import, no matter be from economic benefit or from social benefit, it all is very necessary replacing copper pipe at refrigeration industry with aluminum pipe.Make full use of the price difference of copper, aluminum pipe, the situation of present refrigeration pipe based on copper pipe changed into based on aluminum pipe, thereby the manufacture cost of bigger reduction refrigeration product improves competition capability.Practice has proved that aluminium substitution copper does the requirement that refrigeration pipe can satisfy refrigeration performance again.According to this, the present invention not only can significantly reduce the manufacture cost of chiller plant, nor influences the usability of refrigeration product.
The present invention is exactly the purpose of intermediate portion employing aluminum pipe to realize reducing cost with big section of refrigeration pipe specifically, and carries out necessary preservative treatment in aluminum tube surfaces; Respectively weld the preceding paragraph copper pipe at the two ends of aluminum pipe (or an end) then, satisfy the processing request of copper aluminium composite structure pipeline when refrigeration product is assembled with this section copper pipe.
Therefore bare bones of the present invention is that the copper-aluminium tube joint in the pipeline is adopted the inserting mode welding, and be designed to front end at the welded joint position of copper pipe the guide portion of straight tube-like and taper face of weld are thereafter arranged, the external diameter of this guide portion is slightly smaller than the aluminum pipe internal diameter, utilizes pressure welding to meet sb. at the airport to add thermal weld when copper pipe inserts aluminum pipe and above-mentioned taper face of weld and aluminum pipe inwall is fused form.
Preparation method of the present invention, needs according to pipeline length and caliber, choose identical copper pipe of external diameter of pipe and aluminum pipe and carry out preliminary working, the weld part that is about to copper tube end is processed into guide portion and its face of weld after a while that external diameter is slightly smaller than the straight tube-like of aluminum pipe internal diameter, again copper pipe and aluminum pipe are separately fixed on the two arrays of electrodes of float electrode that pressure welding meets sb. at the airport and fixed electrode, and the pilot pressure welding machine moves in the insertion aluminum pipe copper pipe, when the face of weld of the copper pipe of hard is ground away the oxide layer on the soft aluminum pipe inwall to electrifying electrodes, enter until the welding bread of copper pipe and to go to the back to disconnect welding power source in the aluminum pipe, promptly finish the preparation of copper-aluminium combined pipeline.
Consider welding effect, the face of weld of above-mentioned copper pipe should be conical surface.Also can on this taper face of weld, be processed into ring-type shallow slot or helix, to improve welding fusion area and quality
Copper-aluminium combined pipeline for refrigerating system by method for preparing, the external diameter that it is characterized in that copper pipe is identical with aluminum pipe, and the weld part at copper pipe is that front end has the guide portion of straight tube-like and taper face of weld thereafter, the external diameter of this guide portion is slightly smaller than the aluminum pipe internal diameter, the welding area that above-mentioned taper face of weld and aluminum pipe inwall are combined to.
Its welding quality of the present invention who constructs thus is good, the fusion face width, and its joint outward appearance radial dimension unanimity the copper-aluminium tube joint that assembles is carried out do not add in the welding procedure of pressure welding and fill metal and solder flux, and the length of its pipeline can be the length of any needs.
Description of drawings
Fig. 1 copper-aluminium combined pipeline of the present invention (part) decomposition texture schematic representation.
Fig. 2 copper aluminum pipe of the present invention combined pipeline structural representation.
Fig. 3 two ends are that the copper aluminium for aluminum pipe makes up the refrigeration pipe structural representation in the middle of the copper pipe.
1 copper pipe, 2 face of weld, 3 guide portions, 4 aluminum pipes, 5 welding areas, 6 protective coatings wherein.
Embodiment
Preparation method of the present invention, needs according to pipeline length and caliber, choose identical copper pipe of external diameter of pipe and aluminum pipe and carry out preliminary working, the weld part that is about to copper tube end is processed into guide portion and its face of weld after a while that external diameter is slightly smaller than the straight tube-like of aluminum pipe internal diameter, place the UN-35-HQ pressure welding to meet sb. at the airport on the fixed electrode aluminum pipe, for guaranteeing welding effect, aluminum pipe should stretch out certain-length, extension is included in the ceramic block that is embedded on the electrode, copper pipe is placed on the float electrode, extrusion slightly is longer than the extrusion of aluminum pipe, and meeting sb. at the airport by pressure welding moves horizontally float electrode and copper pipe in the insertion aluminum pipe again.To electrifying electrodes, enter until the welding bread of copper pipe and to go to the back to disconnect welding power source in the aluminum pipe when the face of weld of the copper pipe of hard is ground away the oxide layer on the soft aluminum pipe inwall, promptly finish the preparation of copper-aluminium combined pipeline.
Consider welding effect, the face of weld of above-mentioned copper pipe should be conical surface, also can process several ring-type shallow slot or helixes on this taper face of weld.And should before welding, clean the greasy dirt on the copper tube end, wipe the interior burr on the aluminum pipe mouth of pipe off.
Copper-aluminium combined pipeline for refrigerating system by method for preparing, the external diameter that it is characterized in that copper pipe 1 is identical with aluminum pipe 4, and the weld part at copper pipe 1 is that front end has the guide portion 3 of straight tube-like and taper face of weld 2 thereafter, the external diameter of this guide portion 3 is slightly smaller than aluminum pipe 4 internal diameters, the welding area 5 that above-mentioned taper face of weld 2 and aluminum pipe 4 inwalls are combined to.
See Fig. 1; technical characteristics of the present invention is to form copper-aluminium tube joint at one section copper pipe of the one or both ends of aluminum pipe 4 welding; for preventing contingent corrosion, preservative treatment is carried out on the surface outside above-mentioned aluminum pipe 4 and fusion face 5 respectively, as surface plastic spraying, spray paint or overlap thermal shrinkable sleeve as protective layer 6.Combined pipeline or the pipe fitting made by the present invention can not only reduce cost, and reduce copper material consumption, and piping node are smooth attractive in appearance, meets the usage requirement of refrigeration pipe, and especially the compactness reliability of joint has reached the level of copper pipe,
Weld part as the pipe end of pipeline processes illustrated shape at copper pipe 1 pipe end, promptly the front end at copper pipe 1 has the guide portion 3 of straight tube-like and the face of weld 2 of taper after a while, and the external diameter of this guide portion 3 is slightly smaller than the internal diameter of aluminum pipe, be that guide portion and aluminum pipe inwall have a small gap, not only be convenient to peg graft, also can guarantee to store the splash that generates in the welding process and burr technically and any pollution is not brought in pipeline inside.The copper-aluminium structure pipeline of finishing according to the present invention or the inside of pipe fitting do not need cleaning, therefore, can the copper aluminum pipe of any length be welded, and the length of promptly welding pipeline is not subjected to any restriction.
For welding process and mechanism are described better, to be convenient to understand and implement, the summary welding procedure is as follows:
A places the UN-35-HQ pressure welding left and right sides two arrays of electrodes of meeting sb. at the airport respectively with aluminum pipe and copper pipe, under the equipment effect, copper pipe pushed to the aluminum pipe direction, after the targeting part of copper pipe is inserted in the aluminum pipe, the taper face of weld of the copper pipe of hard grinds away the oxide layer on the soft aluminum pipe inwall, force aluminum tube surfaces atom generation plastic deformation, and the copper aluminum pipe is close to cause in the action range of interatomic forces (physics contact).
After b copper aluminium material material reaches the physics contact, between the two arrays of electrodes of the left and right sides, switch on, atom is activated under the acting in conjunction of frictional heat and resistance heat, between the copper aluminum pipe, produce physics and chemical action, form chemical bond, external force continues to exert pressure simultaneously, in this process, rely on the effect that rigidly fixes of the ceramic block of inlaying on the aluminum pipe electrode, the radial dilatation distortion of aluminum pipe is restricted, very big plastic deformation has taken place in the wall thickness of aluminum pipe, realizes welding back copper pipe and the conformity of aluminum pipe on external diameter.
C. after the taper face of weld 2 of copper pipe enters into aluminum pipe, disconnect welding power source, stop pressurization, electrode unclamps, and sets back, and takes off workpiece, finishes the copper Al pipe butt welding.
Connect mode with the copper and aluminium welding of flat mouthful of butt joint and compare, the copper-aluminium structure pipeline of this method processing, although the external diameter of copper pipe and aluminum pipe is identical, the Placement of plug-in type really that obtains.The conical surface of copper pipe contacts with aluminum pipe inwall generating plane, contact length (vertically) surpasses 8mm, the welding fusion area of realizing can carry out anatomic observation weld interface length by butt joint and estimate, the welding weld interface length that the present invention obtains reaches more than the 3mm, increased the welded seal area greatly, significantly improved the compactness of joint, disqualification rate can satisfy batch production requirement fully below 4ppm.
Use the present invention can produce system's pipe fitting of a kind of low cost, high compaction, high spatter property, especially be fit to refrigeration agent for carrying the refrigeration pipe system of cold medium.
Claims (4)
1. the preparation method of a copper-aluminium combined pipeline for refrigerating system, it is characterized in that choosing the identical copper pipe of external diameter of pipe (1) and aluminum pipe (4) carries out preliminary working, the weld part that is about to copper pipe (1) pipe end is processed into guide portion (3) and its face of weld (2) after a while that external diameter is slightly smaller than the straight tube-like of aluminum pipe (4) internal diameter, again copper pipe (1) and aluminum pipe (4) are separately fixed on the two arrays of electrodes of float electrode that pressure welding meets sb. at the airport and fixed electrode, and the pilot pressure welding machine moves in the insertion aluminum pipe (4) copper pipe (1), when the taper face of weld (2) of the copper pipe (1) of hard is ground away the oxide layer on soft aluminum pipe (4) inwall to electrifying electrodes, enter until the face of weld (2) of copper pipe (1) bag and to go to the back to disconnect welding power source in the aluminum pipe (4), promptly finish the preparation of copper-aluminium combined pipeline.
2. copper-aluminium combined pipeline for refrigerating system, the external diameter of its copper pipe (1) is identical with aluminum pipe (4), and at the weld part front end of copper pipe (1) is guide portion (3) that straight tube-like is arranged and taper face of weld (2) thereafter, the external diameter of this guide portion is slightly smaller than aluminum pipe (4) internal diameter, above-mentioned taper face of weld (2) and the welding area (5) that aluminum pipe (4) inwall is combined to is characterized in that being processed with several ring-type shallow slot or helixes on this taper face of weld (2).
3. copper-aluminium combined pipeline for refrigerating system as claimed in claim 4 is characterized in that the surperficial protective layer (6) that plastic-blasting is arranged, spray paint or overlap thermal shrinkable sleeve outside above-mentioned welding area (5).
4. copper-aluminium combined pipeline for refrigerating system as claimed in claim 4 is characterized in that the outer surface at above-mentioned aluminum pipe (4) has plastic-blasting, sprays paint or overlap the protective layer (6) of thermal shrinkable sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100424955A CN1299038C (en) | 2005-02-24 | 2005-02-24 | Copper-aluminium combined pipeline for refrigerating system and its preparing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100424955A CN1299038C (en) | 2005-02-24 | 2005-02-24 | Copper-aluminium combined pipeline for refrigerating system and its preparing method |
Publications (2)
| Publication Number | Publication Date |
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| CN1676980A CN1676980A (en) | 2005-10-05 |
| CN1299038C true CN1299038C (en) | 2007-02-07 |
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| CNB2005100424955A Expired - Fee Related CN1299038C (en) | 2005-02-24 | 2005-02-24 | Copper-aluminium combined pipeline for refrigerating system and its preparing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009030099A1 (en) * | 2007-09-05 | 2009-03-12 | Tiejun Zuo | Bending resistance cu-al pipe connector, producing method thereof and special core bar |
| CN101319742B (en) * | 2007-06-04 | 2012-04-18 | 青岛津海制冷管业有限公司 | Pipe connection used for indoor and outdoor units of air conditioner and its method for making production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100460129C (en) * | 2006-05-25 | 2009-02-11 | 珠海格力电器股份有限公司 | Copper-aluminum composite pipe, processing equipment and processing method thereof |
| CN100420892C (en) * | 2006-09-20 | 2008-09-24 | 左铁军 | Preparation method of copper-aluminum joint with the same inner diameter of copper-aluminum joint as that of aluminum pipe |
| CN100445625C (en) * | 2006-09-20 | 2008-12-24 | 左铁军 | Preparation method and welded joint of thin-walled copper-aluminum pipe without eutectic structure |
| CN100445623C (en) * | 2006-09-20 | 2008-12-24 | 左铁军 | Preparation method of refrigeration pipeline composed of copper elbow and aluminum U tube |
| CN100436912C (en) * | 2006-12-29 | 2008-11-26 | 浙江康盛股份有限公司 | Pipe for connecting air conditioner and manufacturing method |
| CN101319741B (en) * | 2007-06-04 | 2011-05-04 | 左铁军 | Plug-in type copper aluminum pipe welded joint and method of producing the same |
| CN102773598A (en) * | 2012-08-13 | 2012-11-14 | 左铁军 | Novel air conditioning pipe aluminum welding process by utilizing copper as welding medium |
| CN109578706B (en) * | 2018-05-14 | 2020-08-04 | 北海市景泰达科技有限公司 | Copper-aluminum composite pipe connecting pipe |
| CN110735974B (en) * | 2018-07-20 | 2022-06-21 | 新昌县四通机电有限公司 | Pipe fitting connecting structure, manufacturing method thereof, liquid storage device and refrigerating system |
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| JPH1133747A (en) * | 1997-07-15 | 1999-02-09 | Mori Shigeo | Junction of copper pipe and aluminum pipe and method thereof |
| CN2584995Y (en) * | 2002-12-06 | 2003-11-05 | 广东美的集团股份有限公司 | Hose for connecting indoor unit and outdoor unit of air conditioner |
| CN2677719Y (en) * | 2004-01-15 | 2005-02-09 | 左铁军 | Inserted copper alumium pipe welding joint |
-
2005
- 2005-02-24 CN CNB2005100424955A patent/CN1299038C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1133747A (en) * | 1997-07-15 | 1999-02-09 | Mori Shigeo | Junction of copper pipe and aluminum pipe and method thereof |
| CN2584995Y (en) * | 2002-12-06 | 2003-11-05 | 广东美的集团股份有限公司 | Hose for connecting indoor unit and outdoor unit of air conditioner |
| CN2677719Y (en) * | 2004-01-15 | 2005-02-09 | 左铁军 | Inserted copper alumium pipe welding joint |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101319742B (en) * | 2007-06-04 | 2012-04-18 | 青岛津海制冷管业有限公司 | Pipe connection used for indoor and outdoor units of air conditioner and its method for making production method |
| WO2009030099A1 (en) * | 2007-09-05 | 2009-03-12 | Tiejun Zuo | Bending resistance cu-al pipe connector, producing method thereof and special core bar |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1676980A (en) | 2005-10-05 |
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Assignee: Qingdao Haiqing Mechanism Plant Assignor: Zuo Tiejun|Zhao Yue Contract fulfillment period: 2007.3.5 to 2012.3.4 Contract record no.: 2008370000126 Denomination of invention: Copper-aluminium combined pipeline for refrigerating system and its preparing method Granted publication date: 20070207 License type: Exclusive license Record date: 20081125 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2007.3.5 TO 2012.3.4; CHANGE OF CONTRACT Name of requester: QINGDAO CITY HAIQING MACHINE GENERAL FACTORY Effective date: 20081125 |
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Granted publication date: 20070207 Termination date: 20180224 |