JPH0435729Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a heat exchanger that can be used as an outdoor or indoor heat exchanger for an air conditioner.

(Prior Art) An example of a conventional heat exchanger of this kind is shown in FIGS. 3 to 7.

In FIG. 3, 1 is an inlet header, 2 is a heat exchanger tube, 3 is an outlet header, and 4 is a corrugated fin. As is clear from FIG. 4, the heat transfer tube 2 has a flat cross section, has a plurality of refrigerant channels 2b partitioned by partition walls 2a, and is bent in a meandering manner, with one end connected to the inlet header 1 and the other end connected to the inlet header 1. The end is connected to the outlet header 3. The corrugated fins 4 are bent into a wave shape with a wave height Hf, and the crests 4a of the waves are joined to the flat surfaces 2c of the adjacent heat exchanger tubes 2 by brazing or the like. The refrigerant flows from the inlet header 1 through the refrigerant passages 2b of the heat transfer tubes 2 in parallel, as shown by solid arrows in FIG. 3, and flows out from the outlet header 3. Air flows between the heat transfer tubes 2 and the corrugated fins 4 as shown by the white arrows, and at this time, it exchanges heat with the refrigerant flowing through the heat transfer tubes 2 and is cooled or heated. As shown in FIG. 5, a plurality of equal-length incisions 4c are made in parallel to each flat portion 4b of the corrugated fin 4, and then, as shown in FIGS. 6 and 7, The louvers 5, 6, 7, and 8 are formed by pulling up and down to form a certain angle with respect to the air flow direction. The louvers 5 and 6 are connected to the flat part 4b at both ends thereof,
The louvers 7 and 8 are connected to the flat portion 4b not only at both ends but also at one side. The louvers 5 and 7 are inclined in the same direction with respect to the air flow direction, and the louvers 6 and 8 are inclined in the same direction, but in the opposite direction to the direction in which the louvers 5 and 7 are inclined. It is being

(Problem to be solved by the invention) In the conventional heat exchanger described above, the rigidity of the portions of the louvers 7 and 8, where not only both ends but also one side are connected to the flat part 4b, is such that only both ends are connected to the flat part 4b. The rigidity of the louvers 5 and 6 is higher than that of the connected louvers 5 and 6. Therefore, when the corrugated fins 4 are bent into a wave shape, the heights of the waves are uneven, so the crests 4a of each wave are There have been problems such as poor joining when brazing to the flat surface 2c, and deformation of each louver 5 to 8 when the corrugated fins 4 are pressed between the pair of heat exchanger tubes 2 during joining.

(Means for solving the problem) The present invention was proposed to solve the above problem, and its gist is that the crest of each wave is bent into a wave shape and the crest of each wave is joined to the heat exchanger tube. A number of incisions are made in the flat part of the corrugated fin, perpendicular to the crest of the wave and the flow of the extra-tubular fluid, and parallel to each other, and the corrugated fin is pulled up and down to form a predetermined angle with respect to the flow of the extra-tubular fluid. In the heat exchanger formed by forming a louver whose only both ends are connected to the flat part, and a louver whose both ends and one side are connected to the flat part, both ends and one side are the flat part. The heat exchanger is characterized in that the length of the notch of the louver connected to the flat part is longer than that of the louver connected to the flat part only at both ends.

(Embodiment) An embodiment of the present invention is shown in FIGS. 1 and 2.

The length of the cuts 4d of the louvers 7 and 8, which are connected to the flat portion 4b not only at both ends but also on one side, is longer than the length of the other cuts 4c by Δl.
The rest of the structure is similar to the conventional one shown in FIGS. 3 to 7, and corresponding members are given the same reference numerals.

(Effect of the invention) In the present invention, the length of the cut of the louver whose both ends and one side are connected to the flat part is longer than that of the louver whose both ends are connected to the flat part, so that not only both ends but also the louver can be connected to the flat part. Since the rigidity of the portion of the louver whose side sides are connected to the flat portion is reduced, it becomes easy to bend the corrugated fin into a wave shape, and the height of the wave becomes uniform. Therefore, poor bonding between the crests of the waves and the heat exchanger tubes can be reduced, and deformation of the louvers can be prevented. As a result, it becomes possible to improve the heat exchange performance between the fluid flowing inside the heat transfer tube and the fluid outside the tube.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention,
FIG. 1 is a partially cutaway external perspective view of a corrugated fin, and FIG. 2 is a plan view showing notches made in the corrugated fin. Figures 3 to 7 show an example of a conventional heat exchanger.
The figure is a perspective view of the exterior, Figure 4 is an enlarged perspective view with a partial cutout, Figure 5 is a plan view showing notches made in the corrugated fin, and Figure 6 is a partially cutaway view of the corrugated fin. Exterior perspective view shown,
FIG. 7 is a sectional view taken along the - line in FIG. 6. Heat exchanger tube...2, Corrugated fin...4, Wave crest...4a, Same cut...4c, Flat part...
...4b, Louver connected at both ends...5, 6, Louver connected at both ends and one side...7, 8, Notch as above...4d.

Claims (1)

[Scope of utility model registration request] In the flat part of the corrugated fin where the crest of each wave bent in a wave shape is joined to the heat transfer tube, a large number of incisions that are parallel to each other and perpendicular to the crest of the wave and the flow of the extra-tubular fluid are made. By raising the louver up and down at a predetermined angle with respect to the flow, a louver is formed in which only both ends are connected to the flat part, and a louver in which both ends and one side are connected to the flat part. A heat exchanger characterized in that the length of the cut of the louver whose both ends and one side are connected to the flat part is longer than that of the louver whose both ends are connected to the flat part. .