Induction brazing heat dissipation protection tool for small-pipe-diameter thin-walled pipe

Abstract

The utility model relates to the technical field of tools, in particular to a small-pipe-diameter thin-walled pipe induction brazing heat dissipation protection tool which comprises a tool body, the upper portion of the tool body is provided with heat dissipation holes used for leading out heat, and the lower portion of the tool body is provided with a protection head used for being inserted into a thin-walled pipe to be welded. The outer wall face of the protection head abuts against the inner wall of a thin-walled pipe to be welded, a positioning part used for containing a pipe joint is arranged between the outer side wall of the protection head and the tool body, and the problems that in the induction brazing process of the small-pipe-diameter thin-walled pipe fitting, heat is concentrated, the oxidation color exceeds the standard, and spot corrosion is caused are solved. And the overall welding quality and efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of tooling technology, specifically to a heat dissipation protection tooling for induction brazing of small-diameter thin-walled tubes. Background Technology

[0002] Induction brazing is a highly efficient and stable brazing technology with numerous advantages, including high efficiency, stability, low energy consumption, environmental friendliness, and ease of automation. It can effectively weld non-ferrous metals such as aluminum, magnesium, copper, and their alloys, and is widely used in aerospace, rail transportation, and many other industries. The heat required for induction brazing mainly comes from the induced magnetic field generated between the workpiece and the high-frequency current in the induction coil, which in turn generates an induced current. The Joule effect produces heat when current flows between the workpieces. The welding heat is directly related to the welding current and welding time, i.e., "Q = I²RT". During the welding process, the weld nugget first forms a point-like contact after the electrodes are pressed together, and then expands throughout the entire energized area of ​​the pressed electrodes, completing the welding process rapidly.

[0003] Because induction brazing generates concentrated welding heat and a rapid temperature rise, it produces a large amount of heat in a short period of time, making it particularly challenging for welding small-diameter, thin-walled pipes. For example, a flexible metal hose with a corrugated metal inner tube, secured with a mesh and steel sleeve on the outer wall, is induction brazed together. Before induction brazing, the corrugated pipe and the joint are welded together using argon arc welding. The combined welding heat after induction brazing leads to excessive oxidation of the pipe fittings. Furthermore, the flux splashes onto the pipe fittings during welding, causing spot corrosion. Therefore, induction brazing presents significant technological challenges for welding small-diameter, thin-walled pipes. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies in which spot corrosion caused by flux splashing during the brazing process of thin-walled pipes affects product quality, and to provide a heat dissipation protection tool for induction brazing of small-diameter thin-walled pipes.

[0005] To achieve the above objectives, this utility model embodiment adopts the following technical solution: a heat dissipation protection fixture for induction brazing of small-diameter thin-walled tubes, comprising a fixture body, wherein the upper part of the fixture body is provided with heat dissipation holes for dissipating heat, and the lower part of the fixture body is provided with a protective head for insertion into the thin-walled tube to be welded, wherein the outer wall surface of the protective head abuts against the inner wall of the thin-walled tube to be welded, and a positioning part for accommodating a pipe joint is provided between the outer wall of the protective head and the fixture body.

[0006] Furthermore, the tooling body is cylindrical, and the middle position of the tooling body is hollow.

[0007] Furthermore, the heat dissipation hole is disposed on the side wall of the tooling body, and the heat dissipation hole is horizontally disposed through the middle position of the tooling body.

[0008] Furthermore, the diameter of the positioning part is smaller than the diameter of the tooling body, and a chamfer is provided at the connection between the side wall of the tooling body and the positioning part for clamping the pipe connector.

[0009] Furthermore, the bottom of the pipe fitting is provided with a snap ring protruding from the outer side, and the distance between the snap ring and the bottom of the pipe fitting is 2-5mm.

[0010] The beneficial effects of this utility model embodiment are as follows: The middle position of the tooling body is designed to be hollow, which reduces the weight of the tooling and facilitates the rapid conduction and dissipation of heat. It also facilitates the exhaust of heat and fumes generated during the brazing process, ensuring heat dissipation. At the same time, it reduces the effect of hot air on the inner wall of the thin-walled tube to be welded. The protective head, which is set in two parts, can be replaced according to the different diameters of thin-walled tubes, improving the applicability of the tooling body. When in use, the outer wall of the protective head is in close contact with the inner wall of the thin-walled tube to be welded, playing a protective role. It effectively improves welding defects such as joint overheating, excessive welding oxidation color, and corrosion spots of oxidation color on the inner wall of the weld during induction brazing of small-diameter thin-walled tubes. In production applications, it greatly reduces the time and workload of post-weld processing and can achieve stable and efficient induction brazing of small-diameter thin-walled tubes. Attached Figure Description

[0011] Figure 1 This is a schematic cross-sectional view of the overall structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the structural position of the wire mesh sleeve pipe joint of this utility model;

[0013] Figure 3 This is a schematic diagram of the pipe sleeve welding structure of this utility model;

[0014] In the diagram: 1. Tooling body; 101. Heat dissipation hole; 2. Pipe joint; 3. Protective head; 4. Positioning part; 5. Metal corrugated pipe; 501. Steel wire mesh sleeve; 502. Pipe sleeve. Detailed Implementation

[0015] The preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely for explaining the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0016] See Figures 1 to 3This utility model discloses a heat dissipation protection fixture for induction brazing of small-diameter thin-walled pipes. It mainly consists of a fixture body 1 and heat dissipation holes 101, a protective head 3, and a positioning part 4 disposed on the fixture body 1. The fixture body 1 mainly serves the functions of positioning and heat dissipation. The fixture body 1 is designed as a cylinder to match standard small-diameter thin-walled pipe fittings. A handle can also be installed on the fixture body 1 to facilitate positioning and operation during induction brazing. The middle position of the fixture body 1 is designed as hollow, which reduces the weight of the fixture and facilitates the rapid conduction and dissipation of heat. It also facilitates the discharge of heat and fumes generated during brazing, ensuring heat dissipation effect and reducing the effect of hot air on the inner wall of the thin-walled pipe to be welded, thereby improving product quality.

[0017] The tooling body 1 has horizontally arranged heat dissipation holes 101 on its side wall. The heat dissipation holes 101 penetrate through the middle of the tooling body 1. There are multiple heat dissipation holes 101. During use, inert gas is filled into the thin-walled tube to be processed. The multiple heat dissipation holes 101 can effectively dissipate the heat generated during welding, prevent excessive heat accumulation that may cause the tube to oxidize beyond the standard, increase the heat dissipation, and ensure that the heat can be quickly and evenly dissipated through the channels, thereby reducing the temperature of the tube and reducing the possibility of oxidation reaction.

[0018] To facilitate the welding of thin-walled pipes, a protective head 3 is provided at the lower part of the tooling body 1 for insertion into the thin-walled pipe. The protective head 3 can be integrated with the tooling body 1 or be a separate unit. A separate protective head 3 can be replaced according to different diameter thin-walled pipes, improving the applicability of the tooling body 1. During use, the outer wall of the protective head 3 tightly adheres to the inner wall of the thin-walled pipe to be welded, providing protection. Taking the welding of a corrugated metal pipe 5 as an example, a pipe joint 2 needs to be welded to the top of the corrugated metal pipe 5, a wire mesh sleeve 501 needs to be welded to the outside of the corrugated metal pipe 5, and a pipe sleeve 502 needs to be welded to the outside of the wire mesh sleeve 501. During use, the protective head 3 is directly inserted into the inside of the corrugated metal pipe 5, adhering to the inner wall of the corrugated metal pipe 5. The protective head 3 separates the connection between the corrugated metal pipe 5 and the pipe joint 2, effectively isolating the inner wall of the thin-walled pipe from external impurities and flux splashes, and also buffering the direct impact of welding heat on the inner wall of the pipe to a certain extent, reducing the risk of pitting corrosion and improving processing results.

[0019] A positioning part 4 is designed on the outer wall of the protective head 3 between it and the tooling body 1 for precisely clamping the pipe connector 2. The diameter of the positioning part 4 is slightly smaller than the diameter of the tooling body 1, ensuring that the pipe connector 2 can be stably installed in the predetermined position. At the same time, a chamfer is provided at the connection between the side wall of the tooling body 1 and the positioning part 4 to facilitate the smooth insertion of the pipe connector 2, thereby accurately positioning the lower part of the protective head 3 into the interior of the thin-walled pipe, improving the assembly efficiency and accuracy of the tooling.

[0020] To further enhance the stability and reliability of the tooling, the bottom of the pipe fitting 2 is designed with a snap-fit ​​ring protruding from the outer side. The snap-fit ​​ring is 2-5mm away from the bottom of the pipe fitting 2. The gap between the bottom of the snap-fit ​​ring and the wire mesh sleeve 501 provides space for welding, ensuring the welding effect. The protruding snap-fit ​​ring abuts against the inner wall of the wire mesh sleeve 501, which to a certain extent fixes the position of the pipe fitting 2, the metal corrugated pipe 5, and the wire mesh sleeve 501. The wire mesh sleeve 501 is flush with the pipe sleeve 502. The flux is placed on the upper part of the snap-fit ​​ring. During induction brazing, the welding equipment is started, utilizing the high-frequency current and induced magnetism generated by the induction coil. The field excites the induced current inside the pipe fitting, generating the heat required for the Joule effect, and simultaneously completing the welding. This ensures a tight fit between the pipe joint 2 and the positioning part 4, while avoiding damage to the pipe fitting caused by excessive clamping. After welding, the tooling body 1 is pulled out from the inside to complete the welding of the entire component. This effectively improves welding defects such as joint overheating, excessive welding oxidation color, and corrosion spots on the inner wall of the weld during induction brazing of small-diameter thin-walled pipe fittings. In production applications, it greatly reduces the time and workload of post-weld processing, and can achieve stable and efficient induction brazing of small-diameter thin-walled pipes. It is suitable for high-end manufacturing fields such as aerospace and rail transportation.

[0021] It should be noted that in the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0024] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A heat dissipation protection fixture for induction brazing of small-diameter thin-walled tubes, characterized in that: The tooling body (1) is provided with a heat dissipation hole (101) for dissipating heat at the upper part and a protective head (3) for inserting into the thin-walled tube to be welded at the lower part. The outer wall of the protective head (3) abuts against the inner wall of the thin-walled tube to be welded. A positioning part (4) for accommodating the pipe joint (2) is provided between the outer wall of the protective head (3) and the tooling body (1).

2. The heat dissipation protection fixture for induction brazing of small-diameter thin-walled tubes according to claim 1, characterized in that: The tooling body (1) is cylindrical, and the middle position of the tooling body (1) is hollow.

3. The heat dissipation protection fixture for induction brazing of small-diameter thin-walled tubes according to claim 2, characterized in that: The heat dissipation hole (101) is provided on the side wall of the tooling body (1), and the heat dissipation hole (101) is arranged laterally through the middle position of the tooling body (1).

4. The heat dissipation protection fixture for induction brazing of small-diameter thin-walled tubes according to claim 1, characterized in that: The diameter of the positioning part (4) is smaller than the diameter of the tooling body (1), and the connection between the side wall of the tooling body (1) and the positioning part (4) is provided with a chamfer for clamping the pipe connector (2).

5. The heat dissipation protection fixture for induction brazing of small-diameter thin-walled tubes according to claim 1, characterized in that: The bottom of the pipe fitting (2) is provided with a snap ring protruding from the outer side, and the distance between the snap ring and the bottom of the pipe fitting (2) is 2-5mm.

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