WO2022067893A1

WO2022067893A1 - Copper water pipe elbow having solder, and manufacturing method and soldering method therefor

Info

Publication number: WO2022067893A1
Application number: PCT/CN2020/121688
Authority: WO
Inventors: 李法律; 李娟�; 张永靖; 张鑫
Original assignee: 河南龙辉铜业有限公司
Priority date: 2020-09-29
Filing date: 2020-10-16
Publication date: 2022-04-07
Also published as: CN112212101A

Abstract

A copper water pipe elbow having solder, comprising an elbow section (1) and straight pipe sections (2) disposed on both ends of the elbow section (1). Each straight pipe section (2) is provided with an annular solder groove in the circumferential direction, and the solder groove is filled with solder (3) and used for soldering to an external copper water pipe (5). A thin film (4) used for sealing the solder (3) in the solder groove is connected to the opening of each solder groove. The thin film (4) is formed by melting the solder (3), injecting the molten solder into a flat mold to form a thin sheet, and then extending the thin sheet. Also disclosed are a corresponding manufacturing method and soldering method. By using the described technical solution, the external copper water pipe and the copper water pipe elbow can be soldered after being connected together by insertion, and there is no need to perform solder filling on site, no need to remove the sealingly soldered thin film on site, no need to worry about solder falling off due to thin film removal, and no need to worry about the decrease in soldering quality due to impurities formed by the thin film. Therefore, soldering efficiency is greatly increased, and soldering quality is improved.

Description

Copper water pipe elbow with solder and its manufacturing method and welding method

technical field

The invention relates to the technical field of copper water pipes, in particular to the connection technology of copper water pipes.

Background technique

Type a background description paragraph here. In order to improve the welding efficiency of copper water pipe elbow and copper water pipe, annular solder grooves can be arranged on the outer surfaces of both ends of the copper water pipe elbow along the circumferential direction, and solder is filled in the solder groove during welding.

The existing operation is to fill the solder groove with solder during the soldering operation, and the solder cannot be directly filled in the solder groove when the elbow is made. This is because if the solder is filled too early, even if the solder is in the form of a paste, it will come off from the solder bath due to factors such as dry cracking and external vibration. If the solder is bulk, it is more difficult to avoid solder peeling. If tape is used to seal the solder, the tape needs to be peeled off during soldering, and solder peeling will occur when the tape is peeled off. Even if the solder part falls off, the soldering will be weak and there will be a phenomenon of virtual soldering.

technical problem

The purpose of the present invention is to provide a copper water pipe elbow with solder, which can pre-fill the solder into the solder groove while making the elbow, and the phenomenon of solder falling off will not occur, in order to improve the welding efficiency of the copper water pipe elbow Provide the basis.

technical solutions

In order to achieve the above purpose, the copper water pipe elbow with solder of the present invention includes a curved pipe section and a straight pipe section arranged at both ends of the curved pipe section. The tank is filled with solder and used for welding with the external copper water pipe; the opening of the solder tank is connected with a film for sealing the solder in the solder tank. .

The solder groove is an annular groove formed after the straight pipe section is radially recessed. When connecting the external copper water pipe, the external copper water pipe is sleeved outside the straight pipe section. When connecting the external copper water pipe, the straight pipe section is inserted into the external copper water pipe and the external copper water pipe is inserted. The inner wall of the pipe is welded with the straight pipe section by solder.

The solder groove is an annular groove formed after the straight pipe section is radially raised. When connecting the external copper water pipe, the external copper water pipe is inserted into the straight pipe section and its outer wall is welded with the straight pipe section by solder.

Both the groove bottom wall and the side wall of the solder groove are rough surfaces.

The diameter of the straight pipe section is smaller than that of the elbow section, and the outer diameter of the elbow section is the same as the outer diameter of the external copper water pipe to be connected.

The present invention also discloses a method for making the above-mentioned copper water pipe elbow with solder, which is carried out according to the following steps:

The predetermined solder is melted and injected into a flat mold to prepare a solder sheet;

Then cold-press and extend the solder sheet to obtain a solder film;

Then cut the solder film to a predetermined size;

The paste or powder solder is filled into the solder tank, and the solder film is pasted on the notch of the solder tank to seal the solder to obtain a copper water pipe elbow with solder.

The present invention also discloses the welding method of the above-mentioned copper water pipe elbow with solder and external copper water pipe, which is carried out according to the following steps:

The first step is to brush hair;

Use the roughening device to roughen the parts to be welded on the external copper water pipes;

The second step is to clean up; clean up the copper water pipe elbow and the external copper water pipe;

The third step is plugging, plugging the copper water pipe elbow and the external copper water pipe together;

The fourth step is welding, using a high-frequency heating device to heat the external copper water pipe and the copper water pipe elbow at the solder tank, and after the welding is melted and cooled, the external copper water pipe and the copper water pipe elbow are welded together.

beneficial effect

The present invention has the following advantages:

If there is no film, the solder in the solder tank will easily fall off or partially fall off under the action of external vibration during transportation and storage. Therefore, it is not feasible to pre-install the solder when making copper water pipe elbows in the past. of.

Even if a structure such as a sealing tape attached to the elbow is used to seal the solder to prevent the solder from falling off during transportation and storage, it is necessary to remove the sealing tape to expose the solder before soldering. If welding is performed without removing the sealing tape, the impurities formed by mixing the sealing tape into the welding part will greatly reduce the welding quality; if the sealing tape is removed and then soldering, part of the solder will fall off when the sealing tape is removed, which will also lead to poor welding. Firm, there are defects in the virtual welding part.

In a word, in the prior art, it is not feasible to pre-install the solder when manufacturing the copper water pipe elbow, which will inevitably reduce the welding quality.

In the present invention, the solder (bulk material or paste) is enclosed by using a film made of solder, and the solder tank can be filled with solder in advance and sealed when the copper water pipe elbow is made. During transportation and storage, the outer packaging of the copper water pipe (such as a protective tube) protects the film, and the film can effectively prevent the solder from falling off due to external vibration, which makes it possible to seal the solder in the solder tank when making the copper water pipe. In the process of storage and transportation, the solder will not fall off, and it is not necessary to remove the closed welding structure during welding, and it is not necessary to fill the solder. The connection efficiency and connection quality of water pipe elbows and external copper water pipes.

The solder groove is an annular groove formed by the radial depression of the straight pipe section, so that after connecting the external copper water pipe, the connecting part has no convex part to the outside, and the connected pipe fittings are smoother, regular and concise as a whole, which is the preferred setting method of the welding groove. .

The solder groove is an annular groove formed by the radial protrusion of the straight pipe section. After connecting the external copper water pipe, the connecting part has an annular protrusion to the outside, which has a certain aesthetic feeling. As a technical solution parallel to the first embodiment, it can be combined with the first embodiment. Meet the different needs of more customers.

The diameter of the straight pipe section is smaller than that of the elbow section, and the outer diameter of the elbow section is the same as the outer diameter of the external copper water pipe to be connected, so that a smoother overall external structure can be formed after the connection.

During welding, the area of the joint surface between the rough surface and the weld is larger, which can improve the firmness of the weld. After roughening, the welding area can be increased, thereby improving the welding firmness. By adopting the welding method of the present invention, the external copper water pipe and the copper water pipe elbow can be welded together after being plugged together, and there is no need to fill the solder on site, and there is no need to remove the film for sealing and welding on site, and there is no need to worry that the solder will fall off due to the peeling of the film, and there is no need to worry about it. The film forms impurities and reduces the welding quality, which greatly improves the welding efficiency and improves the welding quality.

Description of drawings

Fig. 1 is the structural representation of the copper water pipe elbow with solder of the present invention;

FIG. 2 is a schematic structural diagram of a copper water pipe elbow with solder and an external copper water pipe after welding.

BEST MODE FOR CARRYING OUT THE INVENTION

Example 1

As shown in FIG. 1 to FIG. 2 , the copper water pipe elbow with solder in this embodiment includes a pipe elbow section 1 and straight pipe sections 2 arranged at both ends of the elbow section 1 , and each straight pipe section 2 is provided with an annular ring in the circumferential direction. The solder tank is filled with solder 3 and used for welding with the external copper water pipe 5; the opening of the solder tank is connected with a film 4 for sealing the solder 3 in the solder tank, and the film 4 is melted by the solder 3 and injected into the flat The mold is formed into a thin sheet, which is then extended from the sheet. Melting and extending are conventional technical means, and details are not repeated here.

The diameter of the straight pipe section 2 is preferably smaller than that of the elbow section 1, and the outer diameter of the elbow section 1 is preferably the same as the outer diameter of the external copper water pipe 5 to be connected, so that a smoother overall external structure can be formed after the connection. The structural limitation in this paragraph does not apply to the second embodiment.

If there is no film 4, the solder 3 in the solder tank will easily fall off or partially fall off under the action of external vibration during transportation and storage. Technology is not feasible.

Even if a structure such as a sealing tape pasted with the elbow is used to seal the solder 3 to prevent the solder 3 from falling off during transportation and storage, the sealing tape needs to be uncovered to expose the solder 3 before soldering. If welding is performed without removing the sealing tape, the impurities formed by mixing the sealing tape into the welding part will greatly reduce the welding quality; if the sealing tape is removed and then welding, part of the solder 3 will fall off when the sealing tape is removed, which will also bring about welding. It is not strong, and there are defects in the virtual welding part.

In a word, in the prior art, it is not feasible to pre-install the solder 3 when making the copper water pipe elbow, which will inevitably reduce the welding quality.

In the present invention, the solder 3 (bulk or paste) is enclosed by the film 4 made of the solder 3, and the solder 3 can be filled in the solder groove in advance and sealed when the copper water pipe elbow is made. During transportation and storage, the outer packaging of the copper water pipe (such as a protective tube) protects the film 4, and the film 4 can effectively prevent the solder 3 from falling off due to external vibration, which makes it possible to remove the solder 3 when making the copper water pipe. It is enclosed in the solder tank, and the solder 3 will not fall off during storage and transportation. It is not necessary to remove the closed welding structure during welding, and it is not necessary to fill the solder 3. After directly connecting the external copper water pipe 5, it can be welded, which is very convenient for users. And the connection work improves the connection efficiency and connection quality between the copper water pipe elbow and the external copper water pipe 5 .

The solder groove is an annular groove formed after the straight pipe section 2 is radially recessed. When connecting the external copper water pipe 5, the external copper water pipe 5 is sleeved outside the straight pipe section 2. When connecting the external copper water pipe 5, the straight pipe section 2 is inserted into the external copper water pipe. The inner wall of the copper water pipe 5 inside and outside the pipe 5 is welded with the straight pipe section 2 by the solder 3 .

The solder groove is an annular groove formed after the straight pipe section 2 is radially recessed, so that after connecting the external copper water pipe 5, there is no convex part on the outside of the connecting part, and the connected pipe fittings are smoother, regular and concise as a whole, which is the best choice for welding grooves. How to set.

During welding, the area of the joint surface between the rough surface and the weld is larger, which can improve the firmness of the weld.

The present invention also discloses a method for welding the above-mentioned copper water pipe elbow with solder 3 and external copper water pipe 5, which is carried out according to the following steps:

The predetermined solder 3 is melted and injected into a flat mold to prepare a thin sheet of solder 3;

Then cold-press and extend the solder 3 sheet to obtain the solder 3 film 4;

Then cut the solder 3 film 4 to a predetermined size;

The paste or powder solder 3 is filled into the solder tank, and the film 4 of the solder 3 is pasted on the notch of the solder tank to seal the solder 3 to prepare a copper water pipe elbow with the solder 3 .

The present invention also discloses a welding method for welding the above-mentioned copper water pipe elbow with solder 3 and external copper water pipe 5, which is carried out according to the following steps:

The first step is to brush hair;

Use a deburring device (such as sandpaper or deburring machine) to deburr the part to be welded of the external copper water pipe 5;

The second step is to clean up; clean up the copper water pipe elbow and the external copper water pipe 5;

The third step is plugging, plugging the copper water pipe elbow and the external copper water pipe 5 together;

The fourth step is welding, using a high-frequency heating device to heat the external copper water pipe 5 and the copper water pipe elbow at the solder tank, and welding the external copper water pipe 5 and the copper water pipe elbow together after the welding is melted and cooled.

After roughening, the welding area can be increased, thereby improving the welding firmness. With the welding method of the present invention, the external copper water pipe 5 and the copper water pipe elbow can be welded together after being plugged together, and there is no need to fill the solder 3 on site, and there is no need to remove the film 4 for sealing and welding on site, and there is no need to worry that the solder 3 will open the film 4 without worrying about it. And falling off, there is no need to worry that the film 4 will form impurities and reduce the welding quality, which greatly improves the welding efficiency and improves the welding quality.

Embodiments of the present invention

Except for the structural limitations explicitly stated in Embodiment 1 that are not applicable to this embodiment, the differences between this embodiment and Embodiment 1 are:

The solder groove is an annular groove formed after the straight pipe section 2 is radially raised. When connecting the external copper water pipe 5 , the external copper water pipe 5 is inserted into the straight pipe section 2 and its outer wall is welded with the straight pipe section 2 by the solder 3 .

Claims

The copper water pipe elbow with solder includes a curved pipe section and a straight pipe section arranged at both ends of the curved pipe section. It is welded with the external copper water pipe; the opening of the solder tank is connected with a film for sealing the solder in the solder tank.
The copper water pipe elbow with solder according to claim 1, wherein the solder groove is an annular groove formed after the straight pipe section is radially recessed. When connecting the external copper water pipe, the external copper water pipe is sleeved on the straight pipe section. In addition, when connecting the external copper water pipe, the straight pipe section is inserted into the external copper water pipe and the inner wall of the external copper water pipe is welded with the straight pipe section by solder.
The copper water pipe elbow with solder according to claim 1, wherein the solder groove is an annular groove formed after the straight pipe section is radially raised, and when connecting the external copper water pipe, the external copper water pipe is inserted into the straight pipe section And its outer wall is welded with the straight pipe section by solder.
The copper water pipe elbow with solder according to any one of claims 1 to 3, wherein the bottom wall and the side wall of the solder groove are rough surfaces.
The copper water pipe elbow with solder according to claim 4, wherein the diameter of the straight pipe section is smaller than that of the curved pipe section, and the outer diameter of the curved pipe section is the same as the outer diameter of the external copper water pipe to be connected.
The manufacturing method of the copper water pipe elbow with solder described in claim 5 is characterized in that it is carried out according to the following steps: after the predetermined solder is melted, it is injected into a flat mold to prepare a solder sheet; and then the solder sheet is cold-pressed and extended, A solder film is prepared; then the solder film is cut to a predetermined size; paste or powder solder is filled into the solder tank, and the solder film is pasted at the notch of the solder tank to seal the solder to prepare a copper water pipe with solder elbow.
The welding method of the copper water pipe elbow with solder described in claim 5 and the external copper water pipe is characterized in that carrying out according to the following steps:

The first step is to roughen the hair; use the roughening device to roughen the part to be welded of the external copper water pipe;

The second step is to clean up; clean up the copper water pipe elbow and the external copper water pipe;

The third step is plugging, plugging the copper water pipe elbow and the external copper water pipe together;

The fourth step is welding, using a high-frequency heating device to heat the external copper water pipe and the copper water pipe elbow at the solder tank, and after the welding is melted and cooled, the external copper water pipe and the copper water pipe elbow are welded together.