CN211259905U - Copper-aluminium welded pipe - Google Patents
Copper-aluminium welded pipe Download PDFInfo
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- CN211259905U CN211259905U CN201922098059.XU CN201922098059U CN211259905U CN 211259905 U CN211259905 U CN 211259905U CN 201922098059 U CN201922098059 U CN 201922098059U CN 211259905 U CN211259905 U CN 211259905U
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Abstract
The utility model discloses a copper aluminum welded pipe, which comprises a copper pipe and an aluminum pipe, wherein the aluminum pipe is of a straight pipe structure, one end of the copper pipe is provided with a first necking part and a second necking part, the outer diameter of the first necking part is smaller than that of the second necking part, and the first necking part and the second necking part are connected through a round table top; the second necking part is in interference fit with the pipe hole of the aluminum pipe. The advantages are that: the utility model discloses the contact surface is big, the good and welding strength height of welding back fusion degree.
Description
Technical Field
The utility model belongs to the technical field of the welded tube, especially, relate to a copper aluminium welded tube.
Background
At present, a copper pipe has the characteristics of high pressure resistance, corrosion resistance and long service life, so that the copper pipe is widely applied to some refrigeration equipment, such as the fields of air conditioners and refrigerators; however, since copper is expensive, in order to save cost, the copper-aluminum welded tube is mostly used for conducting air flow; however, the existing copper-aluminum pipe is formed by electrifying, melting and welding, and the structure before welding is as follows: a necking part is arranged at the welding part of the copper pipe (see figure 1), the rear end of the necking part is provided with a welding inclined plane, and the pipe orifice of the aluminum pipe is abutted against the welding inclined plane; when the structure is used for power-on welding (the copper pipe and the aluminum pipe are in contact for power-on hot melting), because the contact surface between the pipe orifice of the aluminum pipe and the welding inclined plane is less, the hot melting area of the pipe orifice of the aluminum pipe is less, the pipe orifice is easy to break during extrusion, and meanwhile, because the hot melting contact area is less after the structure is welded, the fusion degree of the welding position is poorer, and the welding strength is lower; in addition, the molten metal on the necking part of the copper pipe is easy to block the inner pipe orifice after the copper pipe is hot-melted; there is a need for improvement.
Disclosure of Invention
The utility model aims at the not enough of above-mentioned prior art existence, provide a copper aluminium welded tube, it has that the contact surface is big, the characteristics that the fusion degree is good and welding strength is high after the welding.
In order to realize the purpose, the utility model discloses the technical scheme who adopts is: a copper-aluminum welded pipe comprises a copper pipe and an aluminum pipe, wherein the aluminum pipe is of a straight pipe structure, one end of the copper pipe is provided with a first necking part and a second necking part, the outer diameter of the first necking part is smaller than that of the second necking part, and the first necking part and the second necking part are connected through a round table top; the second necking part is in interference fit with the pipe hole of the aluminum pipe.
The outer diameters of the copper pipe and the aluminum pipe are equal.
The joint of the second necking part and the circular table surface is of a round angle structure.
The difference between the outer diameters of the second necking part and the first necking part is 0.4-1 mm.
After the structure is adopted, compared with the prior art, the utility model the advantage that has is: the second necking part of the aluminum pipe is in interference fit with the pipe hole of the aluminum pipe, so that the contact surface is larger during welding, the fusion degree is good, and the welding strength is higher; meanwhile, the first necking part and the inner wall of the aluminum pipe are provided with a gap, so that molten metal hot-melted between the second necking part and the inner wall of the aluminum pipe can be filled into the gap, the welding strength is enhanced, and the phenomenon that the molten metal blocks the pipe orifice is avoided.
Drawings
Fig. 1 is a schematic view of a conventional copper pipe structure.
Fig. 2 is a schematic plan view of the present invention.
Fig. 3 is a cross-sectional view of the present invention.
Detailed Description
The following description is only for the preferred embodiment of the present invention, and the protection scope of the present invention is not limited thereby, the present invention will be further explained with reference to the drawings and the embodiments.
Examples, see fig. 2 and 3: a copper aluminum welded pipe comprises a copper pipe 10 and an aluminum pipe 20, wherein the aluminum pipe 20 is of a straight pipe structure, the outer diameters of the copper pipe 10 and the aluminum pipe 20 are equal, and the welding ends of the copper pipe 10 and the aluminum pipe 20 can be flush after welding. The copper pipe 10 has a first throat portion 11 and a second throat portion 12 at one end, the outer diameter of the first throat portion 11 is smaller than the outer diameter of the second throat portion 12, and the difference between the outer diameters is 0.4 to 1mm, and generally 0.6mm or 0.7mm is selected. The first necking part and the second necking part 11 and 12 are connected through a round table surface 13, the joint of the second necking part 12 and the round table surface 13 is of a round angle structure, and the round table surface 13 can conveniently enable the copper pipe 10 to be smoothly inserted into the aluminum pipe 20 during welding. A welding extrusion inclined plane 14 is arranged between the second necking part 11 and the pipe body on the copper pipe 20, the second necking part 12 is in interference fit with the pipe hole of the aluminum pipe 20, an outward-opened inclined plane is arranged at the pipe orifice of the aluminum pipe 20, the angle of the inclined plane is the same as the inclination angle of the welding extrusion inclined plane 14, and the inner end surface of the inclined plane is tightly attached to the outer surface of the welding extrusion inclined plane 14, so that the extrusion can be smooth; after the insertion, the first necking part 11 has a certain clearance with the inner wall of the aluminum pipe 20. During welding, the copper pipe 10 and the aluminum pipe 20 are inserted into each other, and are electrified and generate high temperature at the contact surface when in contact, so that the outer peripheral surface of the copper pipe 10 and the inner peripheral surface of the aluminum pipe 20 are hot melted, and the outer peripheral surface of the welding extrusion inclined surface 14 is fused into the aluminum pipe 20 after extrusion until the pipe orifice of the aluminum pipe 20 is flush with the peripheral surface of the copper pipe 10; the molten metal flows into the gap between the first necking part 11 and the aluminum pipe 20, so that the welding strength can be enhanced while the pipe orifice is prevented from being blocked. The utility model discloses a pipe hole interference fit of second throat portion 12 and aluminum pipe 20, the outer peripheral face of second throat portion 12 contacts completely with the inner wall of aluminum pipe 20 promptly, because the contact surface is more like this for the degree of fusion after the welding is good and welding strength is higher.
Claims (4)
1. The utility model provides a copper aluminium welded tube, includes copper pipe (10) and aluminum pipe (20), aluminum pipe (20) are the straight tube structure, its characterized in that: one end of the copper pipe (10) is provided with a first necking part (11) and a second necking part (12), the outer diameter of the first necking part (11) is smaller than that of the second necking part (12), and the first necking part and the second necking part are connected through a circular table top (13); the second necking part (12) is in interference fit with the pipe hole of the aluminum pipe (20).
2. The copper aluminum welded tube of claim 1, wherein: the outer diameters of the copper pipe (10) and the aluminum pipe (20) are equal.
3. The copper aluminum welded pipe according to claim 1 or 2, characterized in that: the joint of the second necking part (12) and the round table top (13) is of a round angle structure.
4. The copper aluminum welded tube of claim 3, wherein: the difference between the outer diameters of the second necking part (12) and the first necking part (11) is 0.4-1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922098059.XU CN211259905U (en) | 2019-11-28 | 2019-11-28 | Copper-aluminium welded pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922098059.XU CN211259905U (en) | 2019-11-28 | 2019-11-28 | Copper-aluminium welded pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211259905U true CN211259905U (en) | 2020-08-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922098059.XU Active CN211259905U (en) | 2019-11-28 | 2019-11-28 | Copper-aluminium welded pipe |
Country Status (1)
| Country | Link |
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| CN (1) | CN211259905U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110906070A (en) * | 2019-11-28 | 2020-03-24 | 浙江宏泽自动化设备有限公司 | Copper-aluminium welded pipe |
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2019
- 2019-11-28 CN CN201922098059.XU patent/CN211259905U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110906070A (en) * | 2019-11-28 | 2020-03-24 | 浙江宏泽自动化设备有限公司 | Copper-aluminium welded pipe |
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