JPH0229420Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a plate-fin type heat exchanger incorporated in an air conditioner.

(b) Conventional technology When forming a single heat exchanger with multiple rows of plate fins attached to pipes into an L-shape or U-shape, generally multiple rows of heat exchangers are formed as shown in Publication of Utility Model Publication No. 58-27268. Because each heat exchanger in the row was bent at the same time by applying a jig from both sides, a large bending force was applied to the heat exchanger itself, and the edges of the fins at the bend were crushed by the jig, causing ventilation at the bend. There was a risk that resistance would increase.

For this reason, heat exchangers were bent individually in each row using two types of jigs with different radii of curvature and then lined up, but the fin pitch of the bent part of the heat exchanger was Furthermore, due to the difference in curvature, the fins at the bent portions contact each other in an alternating manner, resulting in a problem in which the ventilation resistance at the bent portions increases.

On the other hand, Japanese Utility Model Application Publication No. 53-96264 proposes that heat exchangers are individually bent in each row with the same curvature using the same jig and then arranged.

(c) Problems to be solved by the invention In the heat exchanger presented in the above publication, the single heat exchanger in the inner row and the single heat exchanger in the outer row are separated from each other from the curved part to the straight part, and the heat exchanger is bent. Since the fin pitch of the straight section is narrower than that of the straight section, most of the air that passes between the curved fins of the heat exchanger in the inner row bypasses the curved fins of the heat exchanger in the outer row. Therefore, the heat exchangers in the outer row had the problem of poor heat exchange efficiency at the bends.

The present invention provides a plate-fin type heat exchanger that solves these problems.

(d) Means for solving the problem This proposal brings the straight parts of the heat exchangers in the inner row into contact with the straight parts of the heat exchangers in the outer row, while the bent parts of the heat exchangers in the inner row A gap is provided between the outer row heat exchanger and the bent portion of the single heat exchanger.

(E) Effect Air that passes between the fins of the bent portion of the heat exchanger unit in the inner (outer) side row once joins in the gap, and then passes through the bent portion of the single heat exchanger unit in the outer (inner) side row. Since the air flows in while being dispersed between the fins of the bending portions, the resistance of the airflow passing between the fins of both bent portions is small, and the heat exchange efficiency is improved.

(F) Embodiment Figures 1 and 2 show an example of the present invention. Figure 1 is a perspective view of a plate-fin type heat exchanger, and Figure 2 is a plan view of the plate-fin type heat exchanger. Heat exchangers 5, 6 are formed from pipes 1, 2 through which the refrigerant flows and a large number of plate fins 3, 4 installed at the same pitch so as to be perpendicular to the pipes 1, 2.
The two heat exchangers 5 and 6 are individually bent at the same curvature using the same jig to form an L-shape, and then placed side by side to form a plate-fin type heat exchanger. be done.

In the plate-fin type heat exchanger thus formed, the straight portions 5a of the heat exchanger units 5 in the inner row are in contact with the straight portions 6a of the heat exchanger units 6 in the outer row, and the heat exchanger units 5 in the inner row are in contact with each other. The bent portion 5b of the heat exchanger unit 6 of the outer row is separated from the bent portion 6b of the heat exchanger unit 6 in the outer row, so that a crescent-shaped gap 7 is formed. Furthermore, both ends of the heat exchanger unit 5 in the inner row and the heat exchanger unit 6 in the outer row
By making the single heat exchanger 6 in the outer row longer than the single heat exchanger 5 in the inner row so that the ends of the plate fins 3 and 4 coincide with each other, the plate fins 3 and 4 in the angry line portions 5a and 6a are aligned with each other. Comrades are in contact and lined up in a straight line.

When such a plate-fin type heat exchanger is housed in an air conditioning unit 9 with a built-in centrifugal fan 8 as shown by a dotted solid line in FIG. The airflow passing through the heat exchanger unit 6 in the outer row from the exchanger unit 5 flows straight between the plate fins 3 and 4 in the straight portions 5a and 6a, and first in the inner row in the bent portions 5b and 6b. bent portion 5b of
After flowing between the plate fins 3 of the outer row, the liquid flows once into the gap 7, and then flows while being dispersed between the plate fins 4 of the outer row of bent portions 6b. That is, the ventilation resistance between the plate fins 3 and 4 at the bent portions 5b and 6b is reduced by providing the gap 7.
The ventilation resistance can be lowered to almost the same level as the ventilation resistance between the plate fins 3 and 4 at the plate fins 3 and 6a, and the air flow can sufficiently exchange heat at the bent portions 5b and 6b.

FIG. 3 shows another embodiment in place of FIG. 2, in which the heat exchanger unit 10 in the inner row and the heat exchanger unit 11 in the middle row are bent into an L-shape at the same time,
A plate fin type heat exchanger is constructed from this and the outer row of heat exchanger units 12 bent at the same curvature.

Such a heat exchanger also includes each heat exchanger unit 10,1
In the straight parts 10a, 11a, 12a of 1 and 12, the plate fins 13, 14, 15 are aligned in a straight line, and a crescent-shaped gap 16 is formed between the bent part 11b of the middle row and the bent part 12b of the outer row. is provided. In comparison with the first embodiment described above, the straight portion 10
The ventilation resistance at a, 11a, and 12a increases by the addition of one row of heat exchangers, and in addition, due to the contact between the bent portions 10b and 11b of the inner and middle rows, the ventilation resistance at the bent portions 10b, 11b, and 12b increases. Although it is unavoidable that the ventilation resistance will increase, three rows of single heat exchangers can be bent at the same time to reduce the bending parts 10b and 11.
The ventilation resistance of the bent portions 10b, 11b, 12b can be suppressed to a small level compared to a conventional heat exchanger in which the gap 16 is not provided between the bent portions 10b, 11b, and 12b.

In addition, not only between the bent portions 11b and 12b of the middle and outer rows, but also between the bent portions 10a and 1 of the inner and middle rows.
If a gap is also provided between 0b, the bent portion 10
The ventilation resistance of b, 11b, and 12b can be kept small.

Furthermore, in each of the above embodiments, the same jig is used to form the gaps 7, 16 in the heat exchangers 5, 6, 1.
0, 11, 12 are bent at the same curvature, but the straight parts 5a, 6a, 10a, 11a, 12
When comrades a are in contact, the bent portions 5b and 6
If gaps 7 and 16 are formed between b, 10b and 12b, they do not necessarily have to be bent at the same curvature.
Further, as the plate fins, wavy fins or fins with slits may be used.

(g) Effects of the invention This invention brings the straight part of the heat exchanger in the inner row into contact with the straight part of the heat exchanger in the outer row, thereby exchanging heat between the bent part of the heat exchanger in the inner row and the outer row. Since a gap is provided only between the curved part of the heat exchanger unit in the inner row, the air that passes between the fins of the curved part of the heat exchanger unit in the inner row joins the straight part in the isolated gap, and then The air flows through the fins of the curved part of the single heat exchanger in the outer row while being dispersed, reducing the ventilation resistance at the bent part and passing through the bent part of the single heat exchanger in the outer row. It is possible to secure a sufficient amount of air, and obtain heat exchange efficiency that is almost the same as that of a straight section.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a plate-fin type heat exchanger showing one embodiment of the present invention, Fig. 2 is a plan view of the same heat exchanger, and Fig. 3 is a plate-fin type heat exchanger showing another embodiment of the present invention. FIG. 1, 2...pipe, 3, 4, 13, 14, 15
...Plate fin, 5, 6, 10, 11, 12
...Heat exchanger alone, 7, 16...Gap, 5b, 6
b, 10b, 11b, 12b...Bending portion.

Claims (1)

[Scope of utility model registration request] In a plate-fin type heat exchanger that consists of a plurality of heat exchangers each having a large number of plate fins attached to a pipe, each of which is bent in the same direction, the heat exchanger in the inner row The straight part of the heat exchanger unit in the outer row is brought into contact with the straight part of the single heat exchanger unit in the outer row, while a gap is provided between the bent part of the single heat exchanger unit in the inner row and the bent part of the single heat exchanger unit in the outer row. A plate fin type heat exchanger featuring: