CN201173346Y

CN201173346Y - Bend-proof copper aluminum connecting pipe structure with joint having reinforcing rods

Info

Publication number: CN201173346Y
Application number: CNU2008200166399U
Authority: CN
Inventors: 左铁军; 赵超; 扬训; 孙德兴; 赵越; 王昕�
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-01-16
Filing date: 2008-01-16
Publication date: 2008-12-31
Anticipated expiration: 2018-01-16

Abstract

The utility model relates to a welding joint for a dissimilar metal, in particular being suitable for welding a copper pipe and an aluminum pipe. The welding joint adopts the technical proposal that the welding joint is formed by splicing the aluminum pipe with a section of reinforced rib and the copper pipe with a section of reinforced rib, and the length of the reinforced rib is more than the length of the copper pipe inserted in the aluminum pipe; and the length of the copper pipe inserted in the aluminum pipe is more than the plastic deformation length of the aluminum pipe simultaneously, so that the tail end of the copper pipe inserted in the aluminum pipe avoids the plastic deformation region of the aluminum pipe. Because the plastic deformation region of the aluminum pipe is avoided and the wall thickness of the aluminum pipe at the position where the top of the copper pipe is abutted against the aluminum pipe is strengthened, by adopting the structure, the bending and the crack of the copper-aluminum pipe which are possible to occur on the joint or the phenomenon of the crack and the leakage which can not occur in a leakage area can still be ensured when the bending radius of the copper pipe is less, and is bended for 90 degrees, thereby greatly improving the applicability of installing an air conditioner. Obviously, the structure of the welding joint is also suitable for other material combination adopting an inserting connection way.

Description

Joint has the bending resistance Cu-Al connecting pipe structure of stiffening rib

Technical field

The utility model relates to the Cu-Al connecting pipe structure that a kind of joint has stiffening rib, is used for welded joint, the especially copper aluminum pipe welded joint of dissimilar metal.

Background technique

In recent years, because the copper valency is constantly raising up, promoted the market application area of aluminium for copper material technological progress and related industry.China is copper resource relative shortage, the country that bauxite resource is abundant relatively, and refrigeration industry uses copper pipe in a large number at present, and copper changes aluminium reduction manufacture cost and has become crucial problem.But the copper pipe wall thickness majority that refrigeration industry relates to is below 1.0mm; Because it is alternative fully that the peculiar advantage of copper pipe at aspects such as refrigeration pipe production and processing, after-sales services is difficult to by aluminum pipe, all adopt aluminum pipe to replace copper pipe can bring problems.And the centre be the aluminium two ends is copper aluminum bronze structure pipelines of copper, then because switching performance is identical with copper pipe, can replace full copper pipe product fully.

The joint that copper pipe is inserted in the aluminum pipe is fit to the thin wall copper aluminum pipe welding, adopt highfrequency welding, method for welding welding, owing to have reactive pore, copper aluminium eutectic structure, potential unfavorable factors such as corrosion hidden danger, can not realize the metallic bond combination that copper aluminium is firm, it is also very big to realize producing difficulty in batches; Adopt the resistor pressure complex welding method, can overcome the problems referred to above, but copper-aluminium joint position bending resistance is slightly not enough, when bending radius too small, bend angle surpasses 45 degree when above, and the aluminum pipe side fractures easily or ftractures after by the terminal roof pressure of copper pipe, produces and leaks.We claim that this position is most probable generation copper aluminum pipe bending crack or leakage region.These technological deficiencies have all hindered the application of aluminum pipe at refrigeration industry.

Summary of the invention

The technical problem to be solved in the present invention is: design a kind of resistant to bending copper-aluminium tube joint, this copper-aluminium tube joint can realize that joint is difficult for taking place cracking or seepage phenomenon when spending being bent to 90.

The technical solution of the utility model: there is the outer surface of one section band stiffening rib that distributes vertically at the welded joint position of aluminum pipe, when the copper aluminum pipe is subjected to crooked pressure, because the effect of stiffening rib has improved the survivability of aluminum pipe in most probable generation copper aluminum pipe bending crack or leakage region, therefore too small in bending radius, even can guarantee still that when crooked 90 spend copper-aluminium tube joint is in most possible copper aluminum pipe bending crack or also difficult cracking or the seepage phenomenon of taking place of leakage region of taking place.Outer surface has the structural type of stiffening rib to process before welding, also can process when welding or after the welding.The utility model patent structure, because the outer surface of one section equally distributed vertically band stiffening rib is arranged at the welded joint position of aluminum pipe, improved aluminum pipe in the bend survivability of cracking or leakage region of most probable copper aluminum pipe, the local deformation resistance and the damage capability of aluminum pipe opposing copper pipe end are obviously improved, therefore be difficult for taking place cracking or leak the seepage phenomenon.

Because in welding process, be subjected to the effect of resistance heat and the acting in conjunction of end thrust, be in molten state, this part aluminum pipe generation plastic deformation under the acting in conjunction of high temperature and high pressure apart from the aluminum pipe near the certain limit copper and aluminium welding seam, cooling back mechanical property reduces, and fractures easily.Therefore, in the present invention, reach better counter-bending effect, preferably make copper pipe insert the plastic deformation length of the interior length of aluminum pipe simultaneously greater than aluminum pipe.When this structure makes the Cu-Al connecting pipe welded joint be subjected to bending force in installation and using process, its copper pipe end has extended to beyond the aluminum pipe plastic deformation zone, thereby avoided the aluminum pipe zone of poor-performing, the end of copper pipe has withstood on plasticity preferably on the aluminum pipe position, is not easy to destroy aluminum pipe.This technological scheme adopts simultaneously with the structural type that is provided with one section outer surface belt stiffening rib that distributes vertically at the welded joint position of aluminum pipe, to further avoid aluminum pipe destroyed when it is subjected to crooked pressure, thereby improve the whole resistance to bending of copper-aluminium tube joint.

For guaranteeing when welded joint bends to improve the warping resistance ability of aluminum pipe, the length of aluminum pipe outer surface stiffening rib should be inserted the length of aluminum pipe greater than copper pipe.One section stiffening rib that the aluminum pipe outer surface distributes vertically preferably evenly distributes, can be linearly or curve or helix form embody, its quantity can be according to the size setting of design needs and copper pipe.For the copper-aluminium tube joint of regular size, the quantity of the stiffening rib of aluminum pipe outer surface can be 1,2,3 ... several.6 or 8 or 12 of general employings.

Described joint has the Cu-Al connecting pipe structure of stiffening rib, and for obtaining better welding quality, copper pipe can be selected copper tube for use, and aluminum pipe can be selected pure aluminum tube or antirust aluminum pipe for use.

The utility model beneficial effect is:

By outer surface stiffening rib is set at the aluminum pipe welded joint position, can make copper-aluminium tube joint in installation and using process, prevent copper aluminum pipe cracking or leakage phenomenon that the butt joint bending causes effectively, thereby strengthened its resistance to flexure, make it that purposes more widely be arranged.

Description of drawings

The Cu-Al connecting pipe joint figure of Fig. 1 welded junction part reinforcement;

The Cu-Al connecting pipe joint sectional view of Fig. 2 reinforcement

Each symbol implication in the accompanying drawing: 1 copper pipe, 2 aluminum pipe stiffening ribs, 3 aluminum pipes, 4 copper pipe ends, A most probable generation copper aluminum pipe bending crack or leakage region, B aluminum pipe generation plastic deformation length, N copper pipe insert the length of aluminum pipe, the length of M aluminum pipe stiffening rib.

Embodiment

Specific embodiment one:

The copper-aluminium tube joint of present embodiment for being welded by aluminum pipe 3 and aluminum pipe 1, outer surface at the aluminum pipe 3 that is inserted by copper pipe 1 is provided with eight stiffening ribs 2, these stiffening ribs 2 are along the linear array of copper aluminum pipe axial direction, and eight stiffening ribs 2 are along the circumferential distribution of copper pipe 1, also can be linearly or curve or helix form embody.These stiffening ribs 2 can be formed on the copper pipe 1 before processing welding procedure of the present utility model is carried out, and also can be formed on the aluminum pipe 3 in welding even after the welding.

The stiffening rib 2 that aluminum pipe 3 outer surfaces distribute vertically, install and using process in aluminum pipe 3 crackings that cause at most probable generation copper aluminum pipe bending crack or leakage region A can prevent that the joint bending is subjected to the roof pressure of copper pipe end 4 time or leak.As required, the stiffening rib 2 that aluminum pipe 3 outer surfaces distribute vertically, preferably equally distributed, can have one or more, as: can be 1,2,3 ... several.

Copper pipe 1 inserts the length of the length N of aluminum pipe 3 inside greater than copper aluminum pipe generation plastic deformation zone B, and promptly copper pipe 1 end 4 is positioned at outside the B of aluminum pipe generation plastic deformation zone; The length M of aluminum pipe 3 stiffening ribs 2 is so just avoided the regional A of most probable generation copper aluminum pipe bending crack or leakage greater than the length N of copper pipe 1 insertion aluminum pipe 3.

This structure of the foregoing description withstands on the aluminum pipe part of stiffening rib 2 copper pipe 1 end 4, make that the ability of the counter-bending destruction of aluminum pipe is strengthened, therefore too small in bending radius, most probable generation copper aluminum pipe bending crack or seepage zone A was not prone to cracking or seepage phenomenon when bending 90 was spent.

The described Cu-Al connecting pipe welded joint that can resist bending, for obtaining better welding quality, copper pipe 1 can be selected copper tube for use, and aluminum pipe 3 can be selected pure aluminum tube or antirust aluminum pipe for use.

The structure of the utility model patent also is applicable to other combination of materials that inserts Placement.

The present invention describes with reference to drawings and Examples, but protection domain is not limited thereto, and has those of ordinary skill and can pass through simple conversion in the technology of the present invention scope, and obtain the same technique effect of the present invention, equally in protection scope of the present invention.

Claims

1, a kind of Cu-Al connecting pipe joint structure that stiffening rib (2) is arranged comprises the copper pipe (1) and the aluminum pipe (3) that insert welding, and it is characterized in that: there is one section outer surface along the band stiffening rib (2) of Cu-Al connecting pipe axial distribution at the welded joint position of aluminum pipe (3).

2, the Cu-Al connecting pipe joint structure that stiffening rib (2) is arranged as claimed in claim 1, it is characterized in that: copper pipe (1) inserts the length B of the inner length N of aluminum pipe (3) greater than aluminum pipe plastic deformation zone, and promptly copper pipe end (4) is positioned at outside aluminum pipe (3) deformed region.

3, the Cu-Al connecting pipe joint structure that stiffening rib (2) is arranged as claimed in claim 1 is characterized in that: the length M of the stiffening rib (2) of aluminum pipe (3) is inserted the length N of aluminum pipe (3) greater than copper pipe (1).

4, the Cu-Al connecting pipe joint structure that stiffening rib (2) is arranged as claimed in claim 1, it is characterized in that: aluminum pipe (3) stiffening rib (2) distributes along the aluminum pipe outer surface.

5, the Cu-Al connecting pipe joint structure that stiffening rib (2) is arranged as claimed in claim 1, it is characterized in that: aluminum pipe (3) stiffening rib (2) evenly distributes along the aluminum pipe outer surface.

6, as claim 1 or 2 or 3 or the 4 or 5 described Cu-Al connecting pipe joint structures that stiffening rib (2) is arranged, it is characterized in that: aluminum pipe (3) has the outer surface of stiffening rib (2), and has a stiffening rib (2) at least.

7, as claim 1 or 2 or 3 or the 4 or 5 described Cu-Al connecting pipe joint structures that stiffening rib (2) is arranged, it is characterized in that: aluminum pipe (3) has the outer surface of stiffening rib (2), and 6 or 8 or 12 stiffening ribs (2) are arranged.

8, as claim 1 or 2 or 3 or the 4 or 5 described Cu-Al connecting pipe joint structures that stiffening rib (2) is arranged, it is characterized in that: described stiffening rib (2) linearly or curve or helix form.