Method of manufacturing heat exchanger tube and heat exchanger

Abstract

The present invention provides a method of manufacturing a heat exchanger tube in which a tube for a heat exchanger formed by brazing is manufactured using a sheet material, wherein a filler metal melted during brazing can be prevented from entering an opening formed in an opposing portion or a parallel portion formed when bending a sheet material into a tube shape or an opening facing toward the outside of the tube. The opposing portion, the parallel portion, or the opening facing toward the outside of the tube is sealed. As the sealing means, friction welding is preferable.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view showing an example of a tube formed by bending a sheet material.

FIG. 2 is a side view showing another example of a tube formed by bending a sheet material.

FIG. 3 is a side view showing another example of a tube formed by bending a sheet material.

FIG. 4 is a side view showing another example of a tube formed by bending a sheet material.

FIG. 5 is a side view showing another example of a tube formed by bending a sheet material.

FIG. 6 is a side view showing yet another example of a tube formed by bending a sheet material.

FIG. 7 is a side view showing an example of an inner fin tube.

FIG. 8 is a side view showing an example of a junction configuration of an end portion of a sheet bent into a tube shape in the present invention.

FIG. 9 is a side view showing another example.

FIG. 10 is a side view showing yet another example.

FIG. 10 is a partial plan view of FIG. 10.

FIG. 12 is a side view showing another example of a junction configuration of an end portion of a sheet bent into a tube shape in the present invention.

FIG. 13 is a partial plan view of FIG. 12.

FIG. 14 is another partial plan view of FIG. 12.

FIG. 15 is a side view showing an example of a lower end face of a hard tool 5 in FIGS. 10 and 11.

FIG. 16 is a side view showing another example of a lower end face of a hard tool 5 in FIGS. 10 and 11.

FIG. 17 is a side view showing another example of a lower end face of a hard tool 5 in FIGS. 10 and 11.

FIG. 18 is a side view showing yet another example of a lower end face of a hard tool 5 in FIGS. 10 and 11.

FIG. 19 is a partial perspective view showing an example of an opposing portion bent into a tube shape in the present invention.

Claims

1. A method of manufacturing a heat exchanger tube in which a tube for a heat exchanger formed by brazing is manufactured using a sheet material, the method comprising: bending a sheet material into a tube shape while oppositely disposing end portions or disposing end portions or an end portion and a portion other than the end portion in parallel; and sealing an opening formed in the opposing portion or the parallel portion or an opening facing toward outside of the tube.

2. The method of manufacturing a heat exchanger tube according to claim 1, wherein the sheet material is formed of aluminum (including aluminum alloy, hereinafter the same).

3. The method of manufacturing a heat exchanger tube according to claim 1, wherein the sheet material is formed of copper.

4. The method of manufacturing a heat exchanger tube according to claim 1, wherein the parallel portion is formed in three layers in which an end portion of an inner fin inserted into the tube is placed between the end portions disposed in parallel.

5. The method of manufacturing a heat exchanger tube according to claim 1, wherein the sealing is performed by friction welding.

6. The method of manufacturing a heat exchanger tube according to claim 1, wherein the sealing is performed by friction stir welding.

7. The method of manufacturing a heat exchanger tube according to claim 5, wherein the friction welding includes restraining the opposing portion, the parallel portion, or the opening facing toward the outside of the tube, pressing a hard tool against the portion, relatively moving the portion and the hard tool to cause the hard tool to slide with respect to the portion, thereby causing frictional heat generation and a plastic flow to occur.

8. A heat exchanger manufactured by assembling a tube manufactured using the method according to claim 1, a header, and a fin, and integrating the tube, the header, and the fin by brazing.