CN219198415U

CN219198415U - Plug-in type thin-wall copper-aluminum pipe welded joint

Info

Publication number: CN219198415U
Application number: CN202320137410.5U
Authority: CN
Inventors: 范孝红; 兰勇
Original assignee: Wuhu Yongda Refrigeration Parts Co ltd
Current assignee: Wuhu Yongda Refrigeration Parts Co ltd
Priority date: 2023-02-07
Filing date: 2023-02-07
Publication date: 2023-06-16
Anticipated expiration: 2033-02-07

Abstract

The utility model discloses a plug-in type thin-wall copper-aluminum pipe welded joint, which comprises an aluminum pipe and a copper pipe, wherein one end of the copper pipe is connected with the joint, the surface of the joint is provided with annular grooves at equal intervals, the maximum diameter of the outer wall of the aluminum pipe is the same as that of the outer wall of the copper pipe, and the inner ring of the aluminum pipe is the same as that of the copper pipe.

Description

Plug-in type thin-wall copper-aluminum pipe welded joint

Technical Field

The utility model relates to the field of copper aluminum pipe welding, in particular to a plug-in type thin-wall copper aluminum pipe welding joint.

Background

The welding of the inserted copper-aluminum pipe is to weld one end of the copper pipe and the aluminum pipe with each other in a heating state, because China is a country with relatively abundant aluminum resources, copper resources are relatively scarce, so copper-aluminum conversion can obviously reduce manufacturing cost, because the melting point of the copper material is obviously higher than that of the aluminum material, the copper pipe can be spliced only by heating to the temperature at which the aluminum material can be melted, and one end of the copper pipe is of a conical structure and is in charge of being inserted into the aluminum pipe.

Therefore, we propose a plug-in type thin-wall copper-aluminum pipe welded joint to solve the above problems.

Disclosure of Invention

The utility model aims to provide a plug-in type thin-wall copper-aluminum pipe welded joint, which solves the problem that molten aluminum flows back into an aluminum pipe in the heating and splicing process of the copper pipe and the aluminum pipe in the background art, and the effect of the through flow of the aluminum pipe is easily influenced after cooling.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model provides a plug-in type thin wall copper aluminum pipe welded joint, includes aluminum pipe and copper pipe, copper pipe one end integrated into one piece is equipped with the joint, the joint includes cylinder section and toper section, the one end of aluminum pipe is offered and is connected the jack groove of cylinder section looks adaptation, aluminum pipe outer wall maximum diameter is the same with copper pipe outer wall maximum diameter department, connect the inner wall of cylinder section and aluminum pipe inner wall on a straight line.

In a further embodiment, the connector is provided with annular grooves equidistantly along the length direction thereof.

In a further embodiment, the distance between the inner wall of the insertion groove and the inner wall of the aluminum pipe is equal to the thickness of the copper pipe.

In a further embodiment, a stepped groove for abutting and limiting the end part of the cylindrical section of the butt joint is formed between the splicing groove and the bordering part of the aluminum pipe.

In a further embodiment, a welding mandrel is inserted into the inner side of the copper pipe to support the joint at the joint when welding.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, the splicing groove is formed in the inner side of the aluminum pipe before the aluminum pipe and the copper pipe are spliced, the oxide film on the surface of the aluminum pipe can be turned before the aluminum pipe and the copper pipe are heated and spliced, and pure aluminum materials are exposed, so that the splicing groove of the aluminum pipe is easier to melt and is mutually welded with the outer side of the copper pipe, the formation of a copper aluminum compound is more facilitated, and secondly, in the process that the aluminum pipe and the copper pipe are heated and spliced, molten aluminum can not flow to the inner diameter of the aluminum pipe due to the blocking of the splicing groove, and only can flow to the joint, so that the problem that the molten aluminum in the aluminum pipe affects the through-flow effect of the aluminum pipe after cooling can be avoided, and meanwhile, the splicing and welding quality of the aluminum pipe and the copper pipe can be improved.

2. According to the utility model, the annular groove is formed in the joint on the copper pipe, so that molten aluminum or a copper-aluminum compound can enter the annular groove, the problem that molten aluminum leaks out of the outer wall of the copper pipe caused by full extrusion of the aluminum pipe and the copper pipe can be avoided, the annular groove can accommodate more molten aluminum, and then the cooled aluminum entering the annular groove can form a concave-convex matching effect with the annular groove, so that the connection between the copper pipe and the aluminum pipe is tighter.

Drawings

Fig. 1 is a schematic view of a three-dimensional structure of a welding joint of a plug-in type thin-wall copper aluminum pipe in front view.

Fig. 2 is a schematic diagram of the structure of the inside of the side face in the plug-in type thin-wall copper-aluminum pipe welded joint.

Fig. 3 is a schematic structural view of an aluminum pipe in a plug-in type thin-walled copper-aluminum pipe welded joint.

In the figure: 1. an aluminum pipe; 2. copper pipe; 3. a joint; 4. an annular groove.

Description of the embodiments

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in a specific case.

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-3, in the utility model, a plug-in type thin-wall copper-aluminum pipe welding joint comprises an aluminum pipe 1 and a copper pipe 2, wherein one end of the copper pipe 2 is integrally formed with a joint 3, the joint 3 comprises a cylindrical section and a conical section, a plug-in groove matched with the cylindrical section on the joint 3 is formed at one end of the aluminum pipe 1, the maximum diameter of the outer wall of the aluminum pipe 1 is the same as the maximum diameter of the outer wall of the copper pipe 2, and the inner wall of the cylindrical section of the joint 3 and the inner wall of the aluminum pipe 1 are in a straight line.

Examples

Referring to fig. 1-3, in the embodiment of the utility model, the distance from the inner wall of the insertion groove to the inner wall of the aluminum pipe 1 is equal to the thickness of the copper pipe 2, the insertion groove can prevent the melted copper aluminum compound from flowing to the inner diameter of the aluminum pipe 1 in the process of mutually splicing the aluminum pipe 1 and the copper pipe 2, and meanwhile, the insertion groove at one end of the insertion groove is turned to expose pure aluminum material, so that the formation of the copper aluminum compound eliminates the interference of aluminum oxide.

And a stepped groove for abutting and limiting the end part of the cylindrical section of the butt joint 3 is formed between the splicing groove and the bordering part of the aluminum pipe 1.

Annular grooves 4 are formed in the joint 3 at equal intervals along the length direction of the joint, when the aluminum pipe 1 and the copper pipe 2 are in contact with each other, the molten copper aluminum compound is extruded to the outer wall of the joint 3 by high pressure, and the molten copper aluminum compound gradually permeates into the annular grooves 4, so that the redundant copper aluminum compound can enter the annular grooves 4 even after being fully extruded, and cannot overflow.

The welding core rod for supporting the joint of the copper pipe 2 and the joint 3 during welding is inserted into the inner side of the copper pipe 2, and can play a supporting role on the outer diameter profile of the copper pipe 2, so that the copper pipe 2 can be better extruded and attached to the inner diameter of the aluminum pipe 1, and the shape of a pipeline at the whole joint is kept unchanged.

The working principle of the utility model is as follows:

firstly, selecting an aluminum pipe 1 and a copper pipe 2, splicing one end of the copper pipe 2 with a joint 3 with the aluminum pipe 1, splicing one side with a splicing groove with the joint 3 of the aluminum pipe 1, after determining the position and the direction of splicing, clamping the aluminum pipe 1 and the copper pipe 2 into an electrode group, clamping the copper pipe 2 onto a movable electrode, clamping the aluminum pipe 1 onto a fixed electrode, transversely inserting the copper pipe 2 into the aluminum pipe 1 through the movable electrode, electrifying the movable electrode and the fixed electrode, heating a resistor part, heating the electrode at the same time, melting the aluminum pipe 1 firstly because of the difference of melting points of the copper pipe 2 and the aluminum pipe 1, but covering a layer of aluminum oxide on the surface of the aluminum pipe 1, preventing molten pure aluminum from dripping, completely removing the aluminum oxide on the surface because of transversely inserting the copper pipe 2, copper is directly contacted with pure aluminum in a molten state of the innermost layer of the aluminum pipe 1 to form a copper aluminum compound, and as the inserting groove formed on the inner side of the aluminum pipe 1 and the inner diameter of the aluminum pipe 1 form a stepped structure, when the aluminum pipe 1 and the copper pipe 2 are contacted with each other, the molten copper aluminum compound is extruded to the outer wall of the joint 3 by high pressure, and the molten copper aluminum compound gradually infiltrates into the inner part of the annular groove 4, so that even after the copper aluminum compound is fully extruded, the excessive copper aluminum compound can enter the inner part of the annular groove 4 without overflowing, and after the copper aluminum compound is cooled and solidified, a convex structure can be formed between the copper aluminum compound and the annular groove 4 to form concave-convex fit, so that the aluminum pipe 1 and the copper pipe 2 are more tightly matched, a welding mandrel is required to move to a welding position at a moving speed higher than that of the copper pipe 2 while heating fit, the profile shape of the copper pipe 2 is supported, the joint 3 of the copper pipe 2 is pressed and matched with the inner side of the aluminum pipe 1 more tightly.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. A plug-in type thin-wall copper aluminum pipe welded joint is characterized in that: including aluminum pipe (1) and copper pipe (2), copper pipe (2) one end integrated into one piece is equipped with connects (3), connect (3) including cylinder section and toper section, the one end of aluminum pipe (1) offered with connect (3) on the spliced groove of cylinder section looks adaptation, aluminum pipe (1) outer wall maximum diameter is the same with copper pipe (2) outer wall maximum diameter department, connect the inner wall of (3) cylinder section and aluminum pipe (1) inner wall on a straight line.

2. A plug-in thin-walled copper aluminum pipe welded joint according to claim 1 wherein: annular grooves (4) are formed in the connector (3) at equal intervals along the length direction of the connector.

3. A plug-in thin-walled copper aluminum pipe welded joint according to claim 1 wherein: the distance between the inner wall of the inserting groove and the inner wall of the aluminum pipe (1) is equal to the thickness of the copper pipe (2).

4. A plug-in thin-walled copper aluminum pipe welded joint according to claim 2 wherein: a stepped groove for abutting and limiting the end part of the cylindrical section of the butt joint (3) is formed between the splicing groove and the bordering part of the aluminum pipe (1).

5. A plug-in thin-walled copper aluminum pipe welded joint according to claim 1 wherein: and a welding core rod for supporting the joint of the copper pipe (2) and the joint (3) during welding is inserted into the inner side of the copper pipe.