CN201081062Y

CN201081062Y - Aluminum connecting pipe end composite structure

Info

Publication number: CN201081062Y
Application number: CNU2007200413300U
Authority: CN
Inventors: 葛竹山; 张煜
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-08-03
Filing date: 2007-08-03
Publication date: 2008-07-02
Anticipated expiration: 2017-08-03

Abstract

The utility model discloses a pipe end composite structure of an aluminium connecting pipe, which consists of an aluminium pipe, a copper protection pipe and a bushing, wherein, the left end of the copper protection pipe adopts an inner flanging double-layer tube structure; the aluminium pipe is inserted into the copper protection pipe by interference and terminated at the inner flanging; an orifice on the left end is milled into a trumpet shape via a flaring device, so that the pipe walls of the copper protection pipe and the aluminium pipe are sealed more tightly. The binding site of the right end of the copper protection pipe and the aluminium pipe is provided with the bushing made of polyethylene plastics; the bushing is retracted and covered on the outerwall of the pipes after being heated, thereby playing the both roles of pipe protecting and sealing. Two ends of a whole aluminium pipe are respectively compounded with copper protection sheaths, thereby sufficiently reserving the advantages of copper connecting pipes, and improving the mechanical strength; the problem of leakage of the joint is prevented, and the possibility of intercrystalline corrosion is prevented. The utility model has a simple structure, high joint strength, good sealing property, and is applicable to connecting pipes for various air conditioners.

Description

Pipe end compound structure of aluminum connecting pipe

Technical field

The present invention relates to a kind of pipe end structure, specifically, the present invention relates to the structure that a kind of aluminium connecting tubes pipe end is provided with sheath.

Background technique

The inside and outside unit of domestic air conditioning is connected by connecting tube.The connecting tube of conventional design is copper pipe, and pipe end is rolled into horn-like through the mouthpart that expands, and this connecting tube satisfies connection seal request and requirement of mechanical strength.Owing to the market reason, the cost of production increase that the copper valency goes up and causes air conditioner manufacturer, many enterprises digest the cost of production that has increased by technological improvement.Prior art adopts the aluminum pipe two ends to weld one section copper pipe respectively, makes the connecting tube with similar copper pipe character, and this technology can effectively be saved the copper pipe material, satisfies the usage requirement of connecting tube transmission refrigeration agent.But, because of the copper aluminum solderability relatively poor, welded joint place intensity is not high, the connecting tube of this kind structure causes crack or fracture damage accident once in a while when installing or safeguarding, even without the accident of being damaged, use also because of copper aluminium molecule potential difference is bigger for a long time, easily form intergranular corrosion and destroy the sealing of welded joint, thereby influence the using effect of air conditioner.

Summary of the invention

The present invention is primarily aimed at the deficiencies in the prior art, propose a kind of simple in structure, join strength is high, good seal performance, the pipe end compound structure of aluminum connecting pipe that need not weld.

The present invention is achieved through the following technical solutions technical goal.

Pipe end compound structure of aluminum connecting pipe, it is made up of aluminum pipe, copper pillar and sleeve pipe.Its improvements are: described copper pillar is a kind of thin walled cylindrical pipe, its left end in-flanges becomes two-layer pipe, columniform aluminum pipe interference is filled in copper pillar endoporus and is terminated in in-flanges, the aluminum pipe pipe end is between double-deck copper pillar, the left end aperture is rolled into horn-like through the mouthpart that expands, copper pillar right-hand member and aluminum pipe connecting part are provided with sleeve pipe.

Copper pillar and aluminum pipe interference fit in the said structure are rolled into horn-likely again through the mouthpart that expands, make the sealing of fitting more of copper pillar and aluminum pipe tube wall.Shell material matter at copper pillar right-hand member and aluminum pipe connecting part suit is polyvinyl plastics, and the rear sleeve shrink wrapped of being heated pipe outer wall not only plays the pillar effect but also plays seal action.

The present invention compared with prior art has the following advantages:

1, the copper pillar is compounded in the aluminum pipe pipe end, fully keeps the advantage of copper connecting tube, increases the mechanical strength of aluminium connecting tubes pipe end again;

2, copper pillar and aluminum pipe interference fit and through roll milling forming, its tube wall is fitted mutually, good seal performance;

3, in the aluminium connecting tubes only with a whole section aluminum pipe, the sorrow of non-joint leakages does not have because of copper pipe and aluminum pipe fit welding causing pipe latus rectum yet and reduces the possibility that makes generation throttling whistle when moving;

4, there is not the intergranular corrosion that copper aluminium intermolecular potential difference causes in the metal alloying district in non-welded structure and the little seepage that produces.

Description of drawings

Accompanying drawing is a structure enlarged diagram of the present invention.

Embodiment

Pipe end compound structure of aluminum connecting pipe shown in the drawings, it is made up of aluminum pipe 1, copper pillar 2 and sleeve pipe 3.Copper pillar 2 is the thin walled cylindrical pipe, the left end in-flanges becomes two-layer pipe, columniform aluminum pipe 1 interference is filled in copper pillar 2 endoporus and is terminated in in-flanges, aluminum pipe 1 pipe end is between double-deck copper pillar 2, the left end aperture is rolled into horn-like through the mouthpart that expands, form the pipe end that copper pillar 2 and aluminum pipe 1 tube wall are fitted more and sealed.Copper pillar 2 right-hand members and aluminum pipe 1 connecting part are provided with the sleeve pipe of being made by polyvinyl plastics 3, are shrink wrapped after sleeve pipe 3 is heated on the pipe outer wall, not only play the pillar effect but also play seal action.The present invention only uses a whole section aluminum pipe 1, copper pillar 2 is compounded in aluminum pipe 1 pipe end, the advantage that fully keeps copper connecting tube, increase the mechanical strength of aluminium connecting tubes pipe end again, the sorrow of non-joint leakage, do not have copper and aluminium welding yet and take over because of mutual fit welding makes the minimizing of pipe latus rectum the possibility of generation throttling whistle when making operation in succession.The non-welded structure of the present invention does not exist copper aluminium intermolecular potential difference in the metal alloying district to cause intergranular corrosion and little seepage of producing.

Claims

1. pipe end compound structure of aluminum connecting pipe, it is made up of aluminum pipe (1), copper pillar (2) and sleeve pipe (3); It is characterized in that: described copper pillar (2) is a kind of thin walled cylindrical pipe, and its left end in-flanges becomes two-layer pipe, and columniform aluminum pipe (1) interference is filled in copper pillar (2) endoporus and terminated in in-flanges, and aluminum pipe (1) pipe end is between double-deck copper pillar (2); The left end aperture is rolled into horn-like through the mouthpart that expands, copper pillar (2) right-hand member and aluminum pipe (1) connecting part are provided with sleeve pipe (3).

2. pipe end compound structure of aluminum connecting pipe according to claim 1 is characterized in that: described sleeve pipe (3) material is a polyvinyl plastics.