JPS62194192A - Fin for heat exchanger - Google Patents

Abstract

PURPOSE:To prevent a louver on a flat part from being hooked by the edge of a louver forming mold upon mold releasing and being deformed by a method wherein the louver on the flat part, which is extended in the fore-half of the process of press work, is formed by the forming mold in the next process. CONSTITUTION:A louver 2 on a flat part, which is extended upon press forming by louver forming molds 4, 4, is formed with a bent part 2a formed by press forming and a length in the direction of a distance W between the raised-slotted louvers 1, 3 is made shorter than the distance W to prevent the one side of the louver 2 on the flat part from being hooked by a louver forming mold 4 upon releasing it from the louver forming molds 4, 4 and being deformed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a fin for a heat exchanger with louvers used in an air conditioner or a cooling device.

[Conventional technology]

Heat exchangers used in air conditioners and cooling devices are composed of many fins and heat transfer tubes, and the fins are equipped with many louvers in order to efficiently exchange heat between the inside and outside fluids during heat transfer. It's being cut up. Japanese Unexamined Patent Publication No. 144892/1989 has proposed a related technology for this louvered fin, and furthermore, in order to increase the efficiency of heat exchange, the louvers have not been arranged in the conventional arrangement as shown in FIG. FIG. 6 is a sectional front view of the louver cut and raised portion. In the figure,
1.3 is a cut-and-raised louver, and 2 is a flat portion louver. The cut and raised louvers 1 and 3 and the flat part louver 2 are formed on a flat part of a corrugated fin (not shown). The corrugated fin is formed multiple times into an approximately S-shape or bellows shape, and the bent portions at both ends are welded and fixed to the refrigerant flow tubes arranged in the plurality of arrangement directions on both sides of the corrugated fin, and the welding The parts other than the fixing part are formed on a flat surface.

The cut and raised louvers 1 and 3 and the flat part louver 2 are arranged on the flat part of the corrugated fin as shown in FIG. 6, and after the cut and raised louvers 3.1 are successively formed adjacent to both sides of the flat part A plane part louver 2 is formed between a cut-and-raised louver 1 and the next cut-and-raised louver 3;
A cut is made at the position of the dashed line B and the position of the dotted line C perpendicular to the position of the dashed line B, but no cut is made in the direction of the arrow in the louver 2 portion of the flat surface. In FIG. 6, the flat part louver 2
shows a cross section at the position of dashed line B where the cut and raise louvers 1 and 3 are cut in the direction of arrow A, and
The cut-and-raised louvers 1.3 each show an end face cut and raised by press molding. The reason why the planar louver 2 is lifted and deformed even though no incision is made at the position of the dashed-dotted line B as described above will be explained with reference to FIGS. 7 and 8.

FIGS. 7 and 8 are explanatory views of the state in which the cut and raised louvers 1 and 3 and the flat part louver 2 are press-formed. In FIG. 7, when cut and raised louvers 1.3 are formed on both sides of a plane part and a plane part louver 2 is to be formed between the cut and raised louvers 1 and 3, a louver forming mold is used during press molding. The plane portion louver 2 is extended in the direction in which the cut-and-raised louvers 1 and 3 are arranged at the oblique position shown in the figure by the blade portion cut and formed by the cutter 4 . That is, the flat portion louver 2 is cut and raised by the louver 1.
, 3 in the direction of distance W.

For this reason, when the louver mold 4.4 is pulled apart, one end surface of the flat louver 2 is caught by the blade of the extended louver mold 4, causing it to be rotated and tilted in the direction of the arrow and deformed. This slanting poses a problem in that the ventilation resistance increases significantly against the direction of the wind in the direction of the arrow.
The planar louver 2 is provided in order to reduce the wind resistance caused by the cut and raised louvers 1 and 3 in order to increase the efficiency of heat exchange, so the planar louver 2 creates ventilation resistance. This is extremely undesirable.

[Problem that the invention seeks to solve]

In the above-mentioned conventional structure, when the flat part louver 2 is provided between the cut and raised louvers 1.3, the flat part louver 2 is stretched and lengthened by the mold blade when press pressure is applied. Since the stretched flat louver 2 is too long, it gets caught, rotates and deforms, and when the louver mold 4 is pulled apart, the flat louver 2
No consideration was given to creating a structure that would prevent the hook from deforming.

The present invention was made in view of the above situation, and it is an object of the present invention to provide a fin for a heat exchanger that can significantly reduce the ventilation resistance of the flat louvers.

[Means for solving problems]

The above purpose is to create a bent portion 2a in the flat portion of the louver 2 that is stretched by the louver molds 4 during press molding. It is formed by press molding, and the length in the distance W direction between the cut and raised louvers 1 and 3 of the flat part louver 2 is made shorter than the distance W, and when the louver mold 4.4 is separated, the flat part is formed by the louver mold 4. This can be achieved by making one side of the louver 2 so that it cannot be deformed by being caught, thereby preventing the flat part louver 2 from deforming.

[Effect]

The flat part louver 2 is stretched by a distance W as shown in FIG. 2 in the first half of the press working process, but the louver mold 4,
4 is molded so that a bent portion 2a is formed in the portion where the flat louver 2 is to be formed. Therefore, as shown in FIG. 3, in the pressed state, the length of the flat part louver 2 in the distance W direction is shorter than the distance W due to the formation of the bent part 2a. When the louver molds 4, 4 are completely separated, there is no possibility that the flat part louver 2 is caught by the blade of the louver mold 4 and deformed.

〔Example〕

Hereinafter, the fin for a heat exchanger of the present invention will be explained with reference to Examples and FIGS. 1 to 3, in which the same parts as those of the conventional art are denoted by the same reference numerals. FIG. 1 is a sectional view of the louver cut and raised portion, and FIGS. 2 and 3 are explanatory views of the louver cut and raised portion of FIG. 1 in a press-formed state. In the figure, reference numeral 2a denotes a bent part formed in a stepwise manner, which is formed by a mold processing part formed at the intermediate part in the distance W direction of the molding part of the flat part of the louver 2 of the louver mold 4.4. The cut-and-raised louvers 1.3 and the flat louvers 2 are machined as shown in Figures 2 and 3, and Figure 2 shows that the cut-and-raised louvers 1 and 3 are cut and raised in the first half of the machining process. The planar portion louver 2 is shown in a state before it is inserted and deformed by approximately half, and is stretched in the direction of a distance W by a mold blade, and before a cut is made at the dotted line C' position shown in FIG. FIG. 3 shows the state after the plane part louver 2 is formed, and the plane part louver 2 is formed so that the length in the distance W direction is smaller than the distance W, that is, the relationship W>w. . Therefore, when separating the louver mold 4.4,
Unlike the conventional case, one end face of the flat louver 2 is not caught by the mold blade and rotated and deformed. In addition, bending ff1
Needless to say, 2a is formed to such an extent that it does not cause any trouble as a ventilation resistance.

In this way, the heat exchanger fin of this embodiment has a flat part formed between the cut and raised louvers.The bent part is formed by louver R press molding, and the flat part in the direction of distance W is smaller than the distance W between the cut and raised louvers. Since the length of the louver is short, it is possible to prevent the flat louver 2 from being inclined, and to significantly reduce the ventilation resistance of the flat louver.

4 and 5 respectively show other embodiments, and the difference between the embodiment in FIG. While the louver 2 is formed in a direction parallel to the dashed line B,
In this embodiment, the bent portion 2a is not bent at a right angle but slightly inclined, and the flat louver 2 is slightly inclined with respect to the dashed line B. Further, the embodiment shown in FIG. 5 differs from the above embodiments in that the bent portion 2a is formed in a gentle mountain shape, whereas the above embodiments are formed as described above. Figure 4.

The embodiment shown in FIG. 5 has all the same effects as the above embodiment.

〔Effect of the invention〕

As described above, the heat exchanger fin of the present invention has the effect of drastically reducing the ventilation resistance of the flat louver portion.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional front view of the cut and raised portion of the louver of the embodiment of the fin for a heat exchanger of the present invention, and FIGS.
An explanatory diagram of the state in which the louver shown in the figure is press-formed, FIG. 4,
FIG. 5 is a cross-sectional front view of the louver cut and raised portion of another embodiment of the heat exchanger fin of the present invention, FIG. 6 is a cross-sectional front view of the louver cut and raised portion of a conventional heat exchanger fin, and FIG.
8 are explanatory views of the state in which the louver shown in FIG. 6 is press-molded, respectively.

Claims (1)

[Claims] 1. The substantially S-shaped or bellows-shaped bent portions at both ends of the corrugated fins, which are arranged in a plurality of substantially S-shaped or bellows-like shapes, are arranged on both sides of the bent portions of the corrugated fins. The corrugated fins are welded and fixed to each of the refrigerant flow tubes arranged in the plurality of arrangement directions, such as a letter shape or a bellows shape, and the corrugated fins are formed into a flat part except for the bent portions at both ends, and both sides of the flat part are formed. In a device that is provided with cut-and-raised louvers cut and raised on each side and a flat part louver formed between the cut-and-raised louvers, the flat part louver has the above-mentioned cut-and-raised louver on both sides sandwiching the flat part louver. A fin for a heat exchanger, characterized in that a bent portion is formed so that the length in the direction of the distance W is shorter than the distance W between the louvers.