Inner diameter of copper aluminum joint, copper aluminum joint with diameter being equal to inner diameter of aluminum pipe, and preparation method
A copper-aluminum joint, inner diameter technology, applied in the direction of pipes/pipe joints/fittings, welding equipment, mechanical equipment, etc., can solve the problems of tearing aluminum pipes, reducing diameter, restricting refrigerant flow, etc. The effect of good quality and wide fusion surface
Active Publication Date: 2008-09-24
左铁军 +1
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Problems solved by technology
[0003] In the prior art, a section of thinner copper tube is welded at the end of the thicker aluminum tube. The outer diameter of the copper tube is the same as that of the aluminum tube, and the inner diameter of the copper tube is slightly larger than that of the aluminum tube. The end is closed, inserted into the inner wall of the aluminum tube and welded to form a socket joint with the copper tube inside and the aluminum tube outside. At this time, the inner diameter of the copper tube shrinkage is obviously smaller than that of the aluminum tube. Refrigerant flow forms an obstacle, restricting the flow of refrigerant
In addition, in the production of some products such as air-conditioning evaporators and condensers, due to the shrinkage of the copper tubes at the joints, it is impossible to expand the tubes. It can be found that although the use of plug-in joints can improve the compactness, there are obvious problems. The diameter shrinkage phenomenon limits the application range of copper-aluminum composite pipe fittings; it is also found in the application that if there is a radial gap between the shrinkage end of the copper pipe line inserted into the plug joint and the aluminum pipe, when the welded joint is bent , it is easy to tear the aluminum tube at the end of the copper tube at the welded joint
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[0019] A preferred version of the present invention is as follows:
[0020] Such as figure 2 The outer diameter is the same or close to the copper tube 1 of the aluminum tube 4, and after shrinking, it is inserted into the aluminum tube and welded to form a tapered bonding surface 6 in which the copper tube is inside and the aluminum tube is outside. After implementing the present invention, the tapered There is no copper-aluminum eutectic structure at the 6 joints, and the diameter difference between the inner diameter φ1 of the welded joint and the inner diameter φ2 of the aluminum tube 2 is less than 2mm.
[0021] Such as figure 1 Processing steps: Take one copper and aluminum tube, first process the welded part of the copper tube 1 into a stepped tubular shape with a thinner tube wall, keep the aluminum tube 4 in its original shape, and place the copper tube 1 in the movable electrode group 3 , fix the copper tube 1 with a high-pressure cylinder, place the aluminum tube...
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A method for preparing CuAl connector with CuAl connector internal diameter being the same as internal diameter of Al tube by welding includes setting a long core shaft at internal of Cu tube forming head of core shaft by a numbers of ball form punch heads arranged from small to big, carrying out reciprocation operation for a numbers of times immediately by auxiliary push cylinder after power is switched off in order to carry out continuous punch-expansion on internal hole of connector.
Description
technical field [0001] The invention relates to the technical field of metal welding, in particular to the improvement of a preparation method for a plug-in copper-aluminum pipe welding joint. Background technique [0002] Refrigerant is the working substance of the refrigeration cycle in the refrigeration device. In the circulation pipeline system using refrigerant as the refrigeration medium, the cooling effect is related to the flow rate of the refrigerant. The shrinkage of the pipeline due to technological reasons will affect the refrigeration performance. The flow rate and flow rate of the agent will eventually affect the product performance of the refrigeration product, so it is very necessary to ensure the uniformity of the inner diameter of the pipeline and joints. [0003] In the prior art, a section of thinner copper tube is welded at the end of the thicker aluminum tube. The outer diameter of the copper tube is the same as that of the aluminum tube, and the inner ...
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IPC IPC(8): F16L13/02B23K11/20
Inventor 赵越左铁军尹衍升孙德兴杨训姜振学陈军
Owner 左铁军