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Protecting structure for welding spot of copper-aluminum connecting pipe and process of protecting structure

A technology for protecting structures and connecting pipes, which is applied to non-detachable pipe connections, pipes/pipe joints/fittings, passing components, etc. It can solve problems such as poor manufacturability, low efficiency, electrochemical corrosion, etc., and achieve simple and effective protection and process The process is simple and the effect of protection is achieved

Inactive Publication Date: 2016-04-06
CHANGHONG MEILING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Copper tubes and aluminum tubes have been widely used in the evaporator of refrigerators and the connecting pipes of air conditioners, but these applications are often in humid environments with alternating cold and hot. Electrochemical corrosion is extremely prone to occur in the environment, and copper-aluminum solder joints are easily broken by force when connecting refrigerators and air-conditioning pipes
[0003] The anti-corrosion design of the area around the copper-aluminum solder joint is the key to the reliability level of refrigerators and air conditioners. For the anti-corrosion design of the area around the copper-aluminum solder joint, electrostatic spraying, paint baking or quick-drying are usually used at present. The method of combining paint with PE heat-shrinkable tube, but these methods are generally poor in manufacturability and prone to the defect of "paint film leaking"; and there are poor reliability and prone to paint film water seepage. In addition, these methods generally have low efficiency, costly defects

Method used

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  • Protecting structure for welding spot of copper-aluminum connecting pipe and process of protecting structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] see figure 1 , the present embodiment provides a copper-aluminum connecting pipe solder joint protection structure, the copper-aluminum connecting pipe includes a first welded pipe 2 and a second welded pipe 1 connected left and right. When the first welded pipe 2 is a copper pipe, the second welded pipe 1 is an aluminum pipe; when the first welded pipe 2 is an aluminum pipe, the second welded pipe 1 is a copper pipe. The inner diameter of the first welded pipe 2 is greater than the outer diameter of the second welded pipe 1, and the connection between the first welded pipe 2 and the second welded pipe 1 forms copper-aluminum solder joints by welding. The hard open sheath 4 on the outside of the melt adhesive layer 3, the hot melt adhesive layer 3 is coated outside the copper-aluminum solder joints of the copper-aluminum connecting pipe and extends for a distance to the left and right sides of the copper-aluminum solder joints, the hard open sheath 4 Along the length d...

Embodiment 2

[0035] The welding spot protection structure of copper-aluminum connecting pipe provided in this embodiment is the same as that in Embodiment 1.

[0036] A copper-aluminum connecting pipe solder joint protection process provided in this embodiment includes the following steps:

[0037] (1) Select the protected object: select the first welded pipe 2 and the second welded pipe 1 that need to be welded, the inner diameter of the first welded pipe 2 is greater than the outer diameter of the second welded pipe 1, and the The joints are welded to form copper-aluminum solder joints, and the copper-aluminum solder joints are used as protection objects;

[0038] (2) Coating hot melt glue: Insert the hot melt glue stick into the hot melt glue gun, power on the hot melt glue gun to heat and melt the hot melt glue stick, and when the hot melt glue stick is heated to 165°C, apply the hot melt glue The hot melt adhesive flowing out of the muzzle of the gun is applied to the outer surface o...

Embodiment 3

[0042] The welding spot protection structure of copper-aluminum connecting pipe provided in this embodiment is the same as that in Embodiment 1.

[0043] A copper-aluminum connecting pipe solder joint protection process provided in this embodiment includes the following steps:

[0044] (1) Select the protected object: select the first welded pipe 2 and the second welded pipe 1 that need to be welded, the inner diameter of the first welded pipe 2 is greater than the outer diameter of the second welded pipe 1, and the The joints are welded to form copper-aluminum solder joints, and the copper-aluminum solder joints are used as protection objects;

[0045] (2) Coating hot melt adhesive: Insert the hot melt glue stick into the hot melt glue gun, power on the hot melt glue gun to heat and melt the hot melt glue stick, and when the hot melt glue stick is heated to 180°C, apply the hot melt glue The hot melt adhesive flowing out of the muzzle of the gun is applied to the outer surfa...

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Abstract

The invention discloses a protecting structure for a welding spot of a copper-aluminum connecting pipe. The copper-aluminum connecting pipe comprises a first welding pipe and a second welding pipe which are connected leftwards and rightwards. The internal diameter of the first welding pipe is larger than the external diameter of the second welding pipe, and the copper-aluminum welding spot is formed at the joint of the first welding pipe and the second welding pipe through welding. The protecting structure comprises a hot melt glue layer and a hard open sheath arranged on the outer portion of the hot melt glue layer in a sleeving mode. The copper-aluminum welding spot of the copper-aluminum connecting pipe is coated with the hot melt glue layer, the hot melt glue layer stretches to the left side and the right side of the copper-aluminum welding spot by a certain distance, the hard open sheath is composed of a left section, a middle section and a right section in the length direction, the left section, the middle section and the right section are sequentially connected, the left section and the right section are both straight pipe sections, the diameter of the left section is larger than that of the right section, the middle section is an inclined transition section for connecting the left section and the right section, the shape of the hot melt glue layer corresponds to that of the hard open sheath, and one side of the hard open sheath is provided with an opening stretching in the length direction. The copper-aluminum welding spot can be protected easily and effectively, implementation is easy, and cost is low.

Description

technical field [0001] The invention relates to a copper-aluminum connecting pipe welding spot protection structure and its technology. Background technique [0002] Copper tubes and aluminum tubes have been widely used in the evaporator of refrigerators and the connecting pipes of air conditioners, but these applications are often in humid environments with alternating cold and hot. Electrochemical corrosion is extremely prone to occur in the environment, and the copper-aluminum solder joints are easily broken by force when connecting refrigerators and air-conditioning pipes. [0003] The anti-corrosion design of the area around the copper-aluminum solder joint is the key to the reliability level of refrigerators and air conditioners. For the anti-corrosion design of the area around the copper-aluminum solder joint, electrostatic spraying, paint baking or quick-dry coating are usually used at present. The method of combining paint with PE heat shrinkable tube, but these me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L13/04
CPCF16L13/04
Inventor 李艳革荆嵩
Owner CHANGHONG MEILING CO LTD