CN204913086U - A three-expansion copper brazing joint butt joint pipe - Google Patents

Abstract

The utility model discloses a three bloated braze welding interface butt joint pipes, including first tubular metal resonator and the second tubular metal resonator of mutual butt joint, the one end of first tubular metal resonator is equipped with bloated oral area, and the diameter of this bloated oral area is greater than the diameter of second tubular metal resonator, the second tubular metal resonator inserts bloated oral area portion forms the welding seam, bloated oral area portion includes the different location section of diameter, welding flux filling section and anti-overflow section, the welding end of second tubular metal resonator inserts location in the location section, the welding flux is followed the welding seam gets into the welding flux filling section and makes first tubular metal resonator, second tubular metal resonator welded fastening, the anti-overflow section can prevent that the welding flux is excessive. The welding is firmer, and the quality is more even, reduces the requirement to welding operator's proficiency, the anti-overflow section has guaranteed that the welding flux filling section can fully weld, has reduced the waste of welding flux outflow and welding flux.

Description

A three-expansion copper brazing joint butt joint pipe

technical field

The utility model relates to the technical field of brazing, in particular to a three-expanded copper fiber butt joint pipe.

Background technique

Brazing is to use a metal material with a lower melting point than the base metal as the solder, heat the weldment and the solder to a temperature higher than the melting point of the solder and lower than the melting temperature of the base metal, use liquid solder to wet the base metal, fill the gap between the joints and The method of interdiffusion with the base metal to realize the connection of the weldment. The brazing deformation is small, and the joint is smooth and beautiful. It is suitable for welding precision, complex and components composed of different materials, such as honeycomb structure plates, turbine blades, hard alloy tools and printed circuit boards. Before brazing, the workpiece must be carefully processed and strictly cleaned to remove oil stains and excessively thick oxide films to ensure the assembly clearance of the interface.

Traditionally, the butt welding of two sections of copper tubes is realized by using a single-expansion copper brazing joint. When the copper tubes with larger diameters are butt-jointed, the following problems will occur: the flame is difficult to be uniform during welding of large-diameter copper tubes, the copper tubes are heated unevenly, and the solder Therefore, the fluidity is uneven. Due to the small welding gap between the tubes, the solder is easy to flow out locally in the place where the flame is strong, and the solder is wasted if the gap between the entire welded copper tubes is increased.

Utility model content

The purpose of this utility model is to overcome the above-mentioned defects in the prior art, and provide a three-bulge copper brazing joint butt joint pipe that can reduce solder outflow and solder waste, has firm welding, uniform quality, and reduces the requirements for the proficiency of welding operators. .

In order to achieve the above purpose, the technical solution provided by the utility model is as follows: provide a three-expansion copper brazing joint butt joint pipe, including a first metal pipe and a second metal pipe that are butted with each other, and one end of the first metal pipe is provided with A bulging part, the diameter of which is larger than the diameter of the second metal tube, the second metal tube is inserted into the bulging part to form a welding joint, and the bulging part includes positioning sections with different diameters, flux filling Section and anti-overflow section, the welding end of the second metal pipe is inserted into the positioning section for positioning, and the solder enters the flux filling section from the welding port to weld and fix the first metal pipe and the second metal pipe. Anti-spill section prevents solder from spilling.

Preferably, in the above technical solution, the welding end of the second metal pipe is inserted into the positioning section for positioning so that the centerlines of the first metal pipe and the second metal pipe are on the same straight line.

As a preference, in the above technical solution, the positioning section, the flux filling section and the anti-overflow section are molded at one time.

Preferably, in the above technical solution, the diameters of the positioning section, the flux filling section, and the overflow prevention section are sequentially increased.

Wherein, both the first metal pipe and the second metal pipe are copper pipes with a diameter of more than 20 mm.

Compared with the prior art, the beneficial effect of the utility model is that: a three-expanded copper brazing joint butt joint of the utility model, when the copper tube is expanded, it no longer expands into a diameter of the expansion part, but It is expanded into three kinds of positioning section, flux filling section and anti-overflow section with increasing diameter at one time. The welding end of the other copper tube is inserted into the positioning section for positioning and then welding, which reduces the requirements for the proficiency of welding operators and ensures two sections The center line of the copper pipe can be located on the same straight line, the welding is stronger and the quality is more uniform. The anti-overflow section can prevent the solder from overflowing, ensure that the flux filling section can be fully welded, and reduce the outflow of solder and the waste of solder.

The three-expansion copper brazing joint butt joint described in the utility model will be further described below in conjunction with the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a structural schematic diagram of a three-expansion copper brazing joint butt joint described in the utility model.

Detailed ways

The following is the best example of a three-expansion copper brazing joint butt joint described in the utility model, which does not limit the protection scope of the utility model.

Please refer to Figure 1, which shows a three-expansion copper brazing joint butt joint, including a first metal tube 1 and a second metal tube 2 that are butted with each other, and one end of the first metal tube 1 is provided with an expansion port part 3, the diameter of the bulging part 3 is larger than the diameter of the second metal tube 2, the second metal tube 2 is inserted into the bulging part 3 to form a welding port 4, and the bulging part 3 includes different diameters The positioning section 31, the flux filling section 32 and the overflow prevention section 33, the welding end of the second metal pipe 2 is inserted into the positioning section 31 for positioning, and the solder enters the flux filling section 32 from the welding port 4 evenly so that the first The first metal pipe 1 and the second metal pipe 2 are welded and fixed, and the anti-overflow section 33 can prevent the solder from overflowing, ensuring sufficient solder in the flux filling section 32 .

In this embodiment, both the first metal pipe 1 and the second metal pipe 2 are copper pipes with a diameter of more than 20 mm.

During implementation, the welding end of the second metal pipe 2 is inserted into the positioning section 31 for positioning and ensures that the centerlines of the first metal pipe 1 and the second metal pipe 2 are on the same straight line. It ensures that the flux filling section can be fully welded, the welding is firmer, and the quality is more uniform, and the requirement for the proficiency of the welding operator is reduced. The anti-overflow section 33 can reduce the outflow of solder and the waste of solder.

Compared with the traditional single-expansion copper brazing joint, the utility model does not increase the production cost of the three-expansion copper brazing joint. Through the improvement of the expansion tube die head, the positioning section 31, the flux filling section 32 and the overflow prevention section 33 are still Once formed, the diameters of the positioning section 31, the flux filling section 32, and the anti-overflow section 33 increase sequentially.

Preferably, please refer to Fig. 1 again, according to the diameter of the copper pipe, the gap of the anti-overflow section 33 is 0.1d to 0.15d, the length of the expansion part 3 is 1.1d, the positioning section 31, flux The total length of the filling section 32 is equal to the diameter of the copper tube.

The above-mentioned embodiment is a preferred implementation mode of the present utility model, but the implementation mode of the present utility model is not limited by the above-mentioned embodiment, and any other changes, modifications and substitutions made without departing from the spirit and principle of the present utility model , combination, and simplification, all should be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (5)

1. a three-expanded copper brazing joint butt joint pipe, comprising the first metal pipe (1) and the second metal pipe (2) butted with each other, one end of the first metal pipe (1) is provided with a bulge ( 3), the diameter of the bulging portion (3) is larger than the diameter of the second metal tube (2), and the second metal tube (2) is inserted into the bulging portion (3) to form a welding joint (4), It is characterized in that the bulging part (3) includes a positioning section (31) with different diameters, a flux filling section (32) and an overflow prevention section (33), and the welding end of the second metal pipe (2) is inserted into the Positioning in the positioning section (31), the solder enters the flux filling section (32) from the welding port (4) to weld and fix the first metal tube (1) and the second metal tube (2). Section (33) can prevent solder from overflowing. 2. A three-expansion copper brazing butt joint pipe according to claim 1, characterized in that: the welding end of the second metal pipe (2) is inserted into the positioning section (31) for positioning and the first The center lines of the metal pipe (1) and the second metal pipe (2) are located on the same straight line. 3. A three-expansion copper brazing butt joint pipe according to claim 1, characterized in that: the positioning section (31), the flux filling section (32) and the anti-overflow section (33) are formed at one time. 4. A three-expansion copper brazing butt joint pipe according to claim 1, characterized in that: the diameters of the positioning section (31), the flux filling section (32), and the overflow prevention section (33) are successively increasing . 5. A three-expansion copper brazing butt joint pipe according to any one of claims 1 to 4, characterized in that: both the first metal pipe (1) and the second metal pipe (2) have a diameter of 20mm above the copper pipe.