JPS5928224Y2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchanger, particularly one in which water can be easily drained at the leeward end of the fins.

Some heat exchangers 1, as shown in FIG. 1, have corrugated fins 3 interposed between vertically installed liquid pipes 2 so that their flat plate portions 4 are substantially horizontal.

For this type of heat exchanger 1, the flat plate portion 4 of each fin is
Since the fins are closely spaced, moisture contained in the air condenses and adheres to each fin.

When moisture adheres, air flow resistance increases and heat transfer efficiency also decreases.

In particular, when louvers are cut into the flat plate portions 4, the flow resistance of air passing between the flat plate portions becomes greater, and in order to reduce this even a little, this condensed water must be removed promptly. It is desirable that

The present invention was devised to eliminate such defects, and the fin's leeward end is shaped so that the cross section perpendicular to the wind flow has an uneven shape, and almost the top of this uneven end. An object of the present invention is to provide a heat exchanger in which water droplets are quickly removed by forming cuts in the fins to reduce the surface tension of the water, thereby improving the heat transfer performance of the fins.

Hereinafter, the heat exchanger according to the present invention will be explained with reference to the drawings.

FIG. 2 shows an embodiment of the heat exchanger, and is a perspective view of the main part of the leeward end of the corrugated fin flat plate section.

Further, the parts other than the main parts shown in FIG. 2 are the same as those shown in FIG. 1.

This heat exchanger has a draining section 12 for dispersing the surface tension of water at the leeward end of a corrugated fin 11 (7) flat plate section 13. This draining section 12 is where water droplets grow and become large particles. It was designed so that it would fall before it reached its peak.

Here, in the process of generating water droplets, moisture in the air is first evaporated and concentrated, and then adheres to the surface of the fin 11.

This attached moisture combines with other moisture and grows further while moving on the surface of the fin 11, and finally accumulates at the leeward end of the fin to form water droplets.

If these water droplets develop further, the 11 flat plate portions 1 of the fin
3. A film of water will form on top of it.

In the embodiment shown in FIG. 2, the draining section 12, which allows water droplets to fall before such a water film or the like is formed, is replaced by the fin 11.
The leeward end in the wind flow direction is formed so that the cross section perpendicular to the wind flow has a corrugated shape, and a cut 17 is made almost at the top of this uneven end 16. It is well formed.

With this configuration, in this draining section 12,
The condensed water flowing on the fin 11 is collected in the recess due to the collecting effect of the concave-convex end portion 16, and the collected condensed water is collected in the concave portion by the notch 17 formed at the bottom of the concave portion. It will fall easily.

That is, the notches 17 are formed to prevent condensed water from continuing to adhere to the fins 11 due to surface tension, and the uneven end portions 16 collect water by utilizing gravity. The notch 17 and the uneven end portion 16 work together to enhance the water falling effect.

In particular, in the present invention, the leeward end of the fin where condensed water is most likely to accumulate is made into a so-called hammer-shaped uneven end 16, and a notch 17 is formed in this uneven end to improve water drainage. By increasing the weight of water droplets,
The purpose is to reduce the water retention capacity of the fins and remove condensed water adhering to the fins as quickly as possible through the synergistic effect of both properties.

FIG. 3 shows another embodiment of the present invention, in which the concave-convex end portion 16 has a sawtooth concavo-convex shape instead of a corrugated bottom.

In the case shown in FIGS. 2 and 3, a notch 17 may be made like a slit after the uneven end portion 16 is formed, but in this case, it is preferable that the notch 17 be wide.

This is because if this width is made narrower, the surface tension becomes stronger, making it difficult for water droplets to fall.

As is clear from the above description, according to the present invention, the leeward end portion of the heat transfer fin is formed so that the cross section perpendicular to the wind flow has an uneven shape such as a wave shape or a sawtooth shape. Since the surface tension of the water is applied to the top of this uneven end part to form a drain for condensed water, the condensed water generated from the heat exchanger etc. does not accumulate on the surface of the fin and immediately falls. The presence of water droplets does not increase air flow resistance and does not reduce heat transfer efficiency.

Furthermore, since no special equipment is used and the fins themselves are simply processed, there is no risk of cost increase, and extremely excellent effects can be achieved.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the main parts of a heat exchanger using corrugated fins, Fig. 2 is a perspective view of the main parts showing one embodiment of the heat exchanger according to the present invention, and Fig. 3 is another embodiment of the present invention. It is a principal part perspective view which shows an example. 11... Corrugated fin, 12... Draining section, 1
3”° flat plate portion, 16... uneven end portion, 17...
Notch.

Claims (1)

[Scope of utility model registration request] A corrugated fin is placed between the vertically installed liquid pipes in a heat exchanger with its flat plate portion being approximately horizontal, and the leeward end of the flat plate portion of the corrugated fin is exposed to the wind. A heat exchanger that is formed so that the cross section perpendicular to the flow has an uneven shape, and a notch is formed at approximately the top of the uneven end portion.