JPH0531427Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a plate-fin heat exchanger in which fins are sandwiched between parallel plates as secondary heat transfer surfaces.

[Prior art]

Conventionally, it was the first plate-fin type heat exchanger.
There is something like the one shown in the figure. In this heat exchanger, the fins 2 between the two plates 1 and 1 are corrugated metal plates, and the top surfaces 4 of the upper and lower stages of each wave are brazed to the plate 1. 1 is stably held by the fins 2, and the wavy shape of the fins 2 provides excellent compressive strength. In addition,
In the figure, 3 is a sidebar.

According to the above heat exchanger, since the plates 1 and fins 2 contain dimensional errors caused during manufacturing or due to external forces during transportation, all step tops are removed during brazing welding. Surface 4, 4...
In order to join plate 1 to plate 1, plate 1
In addition, elastic deformation of the fins 2 is required, and this elastic deformation involves pressing the plate 1 and the fins 2 with uniform force over the entire surface, which generally requires a presser load of several hundred to several thousand tons. As a result, the workability of assembly was not good.

Therefore, recently, on both plates facing each other,
A large number of channel-shaped fins with a U-shaped cross section are brazed in advance, and each fin is free relative to the mating plate, so brazing is not required during assembly, and therefore a large amount of pressure is applied during assembly. A heat exchanger that does not require a heat exchanger has been developed (Japanese Utility Model Publication No. 124884/1984).

[Problem that the invention attempts to solve]

A plate-fin heat exchanger is a heat exchanger in which fins serving as a secondary heat transfer surface are sandwiched between plates as a method of increasing the heat exchange area in order to improve heat exchange efficiency. Therefore, in order to increase the heat exchange efficiency, it is necessary to increase the area of the fin pieces that serve as secondary heat transfer surfaces.

In the case of a heat exchanger with corrugated fins, in order to increase the area of the fins, the pitch of the waves must be reduced, but there is a limit to this due to corrugation processing, and it is also necessary to reduce the pitch of the waves. As mentioned above, it becomes difficult to weld the fins and the plate together.

In addition, in the case of channel-type fins with a U-shaped cross section, it is necessary to use a large number of channel-type fins in order to increase the area of the fin pieces, and because of the large number of channel-type fins, assembly is extremely difficult. becomes difficult.

This idea was developed in view of the above-mentioned actual situation regarding plate-fin heat exchangers, so that even if the area of the fin pieces is increased, it will not hinder assembly.
The object of the present invention is to provide a plate-fin type heat exchanger that can greatly improve heat exchange efficiency.

[Means for solving problems]

In order to achieve the above object, the configuration of this invention is to form the trough width of both corrugated fins wider than the peak width, and weld the corrugated fins to the opposing surfaces of both plates separated by a gap. The gist is that both plates are combined by inserting the part into the width of the valley part of the corrugated fin on the other side.

[Effect]

According to the above configuration, by welding the corrugated fins to the plates in advance and assembling the plates, a secondary heat transfer surface by the wavy fins can be obtained in the space between the plates, so the assembly work is easy. Since the upper and lower corrugated fins are combined with a half-pitch shift, the secondary heat transfer area can be twice that of a single corrugated fin.

〔Example〕

Hereinafter, embodiments will be described based on FIGS. 2 to 6.

The plate fin type heat exchanger is stacked in multiple stages by sandwiching side bars 7, 7... between a large number of plates 5, 5, and each space 8, 8... between the plates 5, 5 is corrugated. It is partitioned by fins 6, 6, etc. (Fig. 4, Fig. 5).

Although this is a multi-tiered structure, for convenience of explanation, the structure between the upper and lower plates 5a and 5b will be explained (FIGS. 2, 3, and 6).

The upper and lower plates 5a, 5b are flat plates and are the same as conventional ones, but the structure of the space 8 between them is different from the conventional one, in that two corrugated fins 6a, 6b are used. Furthermore, the waveform fins 6a and 6b have irregular waveforms.

In other words, conventional corrugated fins were corrugated so that the widths of the crests and troughs were the same and the waves progressed in the same shape up and down (the first
), in this design, the width L of the trough 9 is larger than the width L of the crest 9.
It is formed with a wide width M of 0, and is corrugated so that the waves advance in an irregular shape upward and downward.

Although the shape of the peaks 9 and the shape of the valleys 10 are U-shaped, the shapes are not particularly limited as long as the peaks 9 and valleys 10 alternate; for example, The peak portion 9 may be U-shaped. However, since it is necessary to weld to the plates 5a and 5b, it is desirable to provide a welding bottom surface 11 as wide as possible at the bottom of the valley 10.

Although the upper and lower waveform fins 6a and 6b are formed to have the same waveform, they may have slightly different shapes. However, having the same shape is advantageous for mass production.

Of the upper and lower corrugated fins 6a and 6b, the upper corrugated fin 6a is welded to the upper plate 5a, and the lower corrugated fin 6b is welded to the lower plate 5b at the bottom surface 11, but by shifting them by half a pitch, The assembly form is such that the peak portion 9 protrudes into the width of the valley portion 10 of the other party.

Regarding the method of entering the peak part 9 into the valley part 10,
The peak portion 9 does not reach the bottom of the valley portion 10, but a gap 16 is provided therebetween (FIG. 2), and the heat medium flow path 13,
13 may be left in communication, or conversely, the crest 9
may be brought into contact with the bottom surface of the valley portion 10 (FIG. 6), and the heat medium flow paths 13, 13 may be made independent.

However, in any case, both side pieces of the peak part 9 (also both side pieces of the valley part 10) are the fin pieces 15, 15.
This is what has become the norm.

Therefore, if we look at the single waveform fins 6a and 6b, even if the pitch of the waves is not made that small,
By aligning both waveform fins 6a, 6b, a large number of fin pieces 15, 15, . . . are formed between both plates 5a, 5b.

Further, the width M of the valley portion 10 is wider than the width L of the peak portion 9, and the waveform fin 6 is approximately three times the width L of the peak portion 9.
Since the bottom surfaces 11 of the fins a and 6b are welded to the plates 5a and 5b, the amount of heat transferred from one fin piece 15 to the plates 5a and 5b is very large.

Regarding how to stack a large number of plates 5, 5... and corrugated fins 6, 6..., there is a case where the wave traveling directions of the waveform fins 6 are the same as shown in FIG. They may be crossed as shown.

[Effect of idea]

As explained above, the plate-fin heat exchanger of this invention does not use a large number of fins formed in a channel shape with a U-shaped cross section, but a small number of fins obtained by corrugating a wide plate material. It is easy to assemble because it uses two corrugated fins and welds the corrugated fins to the plates before stacking them.
The work efficiency can be greatly improved, and since the number of fin pieces is totaled by combining the upper and lower corrugated fins, it is possible to make the fin pieces denser or to increase the welding area of the corrugated fins to the plate. This has the excellent effect of greatly increasing heat exchange efficiency.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional example, FIGS. 2 to 6 are embodiments, FIG. 2 is a sectional view showing an inter-plate structure, FIG. 3 is an exploded perspective view of the same, and FIG. FIG. 5 is a cross-sectional view showing a laminated structure, FIG. 5 is a perspective view showing another laminated structure, and FIG. 6 is a cross-sectional view showing another inter-plate structure. 5, 5a, 5b...Plate, 6, 6a, 6b
... Waveform fin, 9 ... Mountain part, 10 ... Valley part, L
...Yamabe Hajime, M...Tanibe Hawa.

Claims (1)

[Scope of utility model registration request] Waveform fins are welded to opposing surfaces of both plates separated by a gap, and the valley widths of both waveform fins are made wider than the peak widths, and the peaks protrude between the widths of the valleys of the opposing waveform fins. A plate fin heat exchanger characterized by a combination of both plates.