JPS5823109Y2 - Inner fin for heat exchanger - Google Patents

Description

[Detailed description of the invention] This invention is inserted into a liquid passage pipe that constitutes a heat exchanger,
The present invention relates to an improvement in an inner fin for a heat exchanger that disturbs the flow of liquid flowing through the tube to improve contact between the test liquid and the inner wall of the liquid passage tube, thereby increasing heat exchange efficiency.

As shown in FIG. 1, an inner fin 2 is inserted into a flat tube 1 that constitutes a core part of a heat exchanger together with an outer fin 3 to disturb the flow of liquid flowing inside the tube 1 and improve heat exchange efficiency. is widely practiced.

Conventionally, as an inner fin used for such a purpose, as shown in FIG. 2, a band-shaped metal plate 4 is bent into a rectangular wave shape, and a portion of the front and rear surfaces of the wave is driven alternately to form through holes 5, Inner fins 2 were used in which the inner fins 5 were formed with fence-like standing walls 6, 6 on the front and rear surfaces of the waves.

However, in such an inner fin, since the vertical walls 6, 6 face the liquid flow, not only does the flow resistance of the liquid become large, but also
There was a drawback that productivity was reduced due to poor mold release during fin molding.

In order to eliminate the above-mentioned drawbacks, the present inventor first devised an inner fin as shown in Figs.
-121774).

That is, the direction of the ridges is aligned with the length direction of the strip metal plate, a double-sloping roof-like part 7 is formed in the center, and a single-sloping roof-like part has openings 8 toward the roof-like part 7 on both sides. Part 9,9
, and each roof-like portion is formed by alternately protruding and recessing at a constant pitch.

Although such fins overcome the aforementioned disadvantages of increased liquid flow resistance and deterioration of productivity, they still have the following disadvantages.

In the inner fin according to the prior invention as shown in FIGS. 3 to 6, the fin 2 has a double-slanted roof portion 7 formed in the center and a single-slope roof portion 7 formed on both sides of the roof portion 7. Since the phases of the roof-like portions 9 and 9 match, the roof-like portion 7
, 9 and the adjacent roof-like portions 7a, 9a, a linear flat portion 10 is formed in the axial direction of the fin 2.

This flat portion has extremely low rigidity and is easily bent compared to the portion where the roof-like portion 7.9 is formed.

Therefore, when inserting the inner fin 2 into the flat tube 1 as shown in FIG. can be easily inserted into the flat tube 1.

For this reason, the close contact between the inner fins 2 and the inner surface of the flat tube 1 deteriorates, and the improvement in heat exchange efficiency by inserting the inner fins becomes insufficient.

In order to eliminate the above-mentioned drawbacks, the present invention improves the rigidity of the inner fin against forces in the bending direction and configures it so that it can be inserted tightly into the inside of a flat tube, thereby creating a heat exchanger using the inner fin. The present invention provides an inner fin that can improve efficiency.

Hereinafter, the present invention will be explained with reference to drawings showing embodiments.

7 to 10 show a first embodiment of the present invention.

The inner fin 2 of this embodiment has a roof-shaped part 7 with both slopes in the center, with the ridge direction aligned with the length direction of the strip-shaped metal plate, and openings 8 facing the roof-shaped part 7 on both sides. The point that the roof-like parts 9, 9 with a single slope are formed, and the protrusion and recess of each roof-like part 7, 9 are formed alternately at a constant pitch and reversed is shown in FIGS. 3 to 5. Although it is similar to the case of the conventional example, in the inner fin of the present invention, the phase of the central roof-shaped parts 7, 7 and the phase of the roof-shaped parts 9, 9 on both sides are slightly shifted (i.e., both roofs are The starting points and ending points of the shaped portions 7 and 9 are not aligned in the length direction.

Therefore, a flat part 10 is formed between the central sloped roof part 7 and the sloped roof part 7a that follows it, and a flat part 10 that is formed between the central sloped roof part 9 and the sloped roof part 9a that follows it. Flat portions 10a formed between and located on both sides of the flat portion 10,
10 a means - not lined up on a straight line.

Therefore, in the inner fin of the present invention, as shown in Fig. 10, there is no part (part a in Fig. 6) that looks extremely constricted like in the conventional inner fin, and the rigidity against the force in the bending direction is increased. improves.

According to the present invention, the rigidity against bending of the inner fin 2 is improved, so that the fin 2 can be pushed into the flat tube with a relatively strong force, and the inner fin 2 can be pushed into the flat tube with a relatively strong force. Since there is no need to provide a margin for the heat exchanger, the adhesion between the inner fin 2 and the inner surface of the flat tube is improved, and the efficiency of the heat exchanger using the inner fin is improved.

11-12 show a second embodiment of the invention.

In this embodiment, the roof-like parts 9, 9 on both sides in the first embodiment are also formed to have both slopes, and as a whole, the roof-like parts 9, 9 on both sides in the first embodiment are
It is wider than the first embodiment shown in FIG.

This embodiment is similar to the first embodiment in that the rigidity of the inner fin is improved by changing the phase of the central roof portion 7 and the roof portions 9, 9 on both sides.

In each of the above embodiments, only the phases of the central roof-shaped portion 7 and the roof-shaped portions 9 on both sides are made different, and the phases of the roof-shaped portions 9 on both sides are matched. However, it is not necessary to match the phases of the roof-like parts 9, 9 on both sides, and if the phases of the roof-like parts 9, 90 on the left and right sides are shifted, the rigidity of the inner fin 2 can be further improved.

Since the inner fin of the present invention is constructed as described above, it has high rigidity in the bending direction of the fin, can be inserted into a flat tube with good adhesion, and has a great practical effect as an inner fin that can improve the efficiency of the heat exchanger. .

[Brief explanation of drawings]

Fig. 1 is a perspective view showing how the inner fin is used, Fig. 2 is a perspective view showing a conventional inner fin, Figs. 3 to 6 show the inner fin according to the previous invention, Fig. 3 is a perspective view, and Fig. 4 3, FIG. 5 is a BB--B sectional view in FIG. 3, FIG. 6 is a side view of the inner fin, and FIGS. 7 to 10 show the first embodiment of the present invention. 7 is a perspective view, FIG. 8 is a plan view, FIG. 9 is a sectional view taken along the line CC in FIG. 8, FIG. 10 is a side view, and FIGS. 11 and 12 show a second embodiment of the present invention. 1st
1 is a plan view, and FIG. 12 is a sectional view taken along line DD in FIG. 11. 2: Inner fin, 4: Band-shaped metal plate, 7: Roof-shaped part, 8
: opening, 9: roof-like part, 10, 10a: flat part.

Claims (1)

[Scope of utility model registration request] An intermediate roof-like part 7 is formed by aligning the direction of the ridge with the length direction of the strip metal plate, and roof-like parts 9, 9 having openings 8 toward the roof-like part 7 are formed on both sides thereof, and Each roof-shaped portion 7,
In the inner fin for a heat exchanger, in which the inner fins 9 are formed by alternately protruding and recessing at a constant pitch, the phase of the intermediate roof-shaped part 7 and the phase of the roof-shaped parts 9 on both sides are shifted. An inner fin for a heat exchanger characterized by a formed inner fin.