JPS5845495A - Heat transmitting fin - Google Patents

Abstract

PURPOSE:To improve a heat transmitting performance and reduce a venting resistance by a method wherein louvers are cut to the bent parts of corrugate fins to form the longest louvers. CONSTITUTION:The configuration of whole U-turn parts are formed so that an unit fin is formed into a configuration wherein each louvers 9 are arranged in a wave form and the cut parts 10 are arriving at positions same as the U-turn parts or very near to the U-turn parts. Accordingly, inflow air A flows between the fins as shown by arrow signs 11, airflow colliding against each louvers becomes well mixed flow, it will not be affected easily by a temperature boundary layer formed by the front louver, and the airflow will never be bent extremely, therefore, a big separation and the generation of an eddy will never be caused. According to said functions, the heat transmitting performance of the fin may be improved and the venting resistance may be reduced remarkably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to fins for heat exchangers used in air conditioners, refrigerators, etc., and particularly relates to the fin shape of a nine-Yorgate type heat exchanger using flat heat transfer tubes.

A corrugated heat exchanger generally has a shape as shown in FIG. 1, and its fins have a shape as shown in FIG. 2. In addition, the cross-sectional shape of the tube is as shown in Figure 3. The first problem with the prior art is that, as can be seen in Figure 3, the incoming air flows in a meandering manner as shown by the arrow 7 while creating a vortex 6 as shown in the figure, resulting in a partial loss of heat transfer performance. There was a drawback that the ventilation resistance was further increased.

The second problem is that, as shown in Figure 2, there is a limit to how deep the louver can cut (it is difficult to cut to the vicinity of the U-turn), so the performance of the louver cannot be fully utilized.

The present invention was invented in view of the above-mentioned problems, and aims to provide a nine-louver shape with excellent performance in a corrugated fin with louvers, and to maximize the length of the louver cut to make the most effective use of the louver. The purpose is to

In order to improve the heat transfer performance of the fins, it is necessary to consider the shape and arrangement of the louvers that can promote uniformity of the temperature of the airflow flowing between the fins. Furthermore, 1. In order to make effective use of such a louver, it is necessary to make the louver cut length as large as possible and increase the area ratio occupied by the louver portion.From the above viewpoint, the present invention has been developed to achieve the intended purpose. , a large number of cuts are made in the fin plate in a direction perpendicular to the flow direction of the fluid flowing between the fins, and the ends of these cuts are bent to form a corrugated fin in which the roots are formed up to the bent part. In addition, ζ1 in which the height positions of the edges of adjacent louvers are shifted from each other is defined as IIIt mold.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is a partially enlarged view of a corrugated fin showing an embodiment of the present invention. As shown in FIG. 5, the cross-sectional shape of each louver 9 constituting this fin is a chevron-shaped cross section, and each louver 9 is arranged in a wave-like shape as a whole. The U-turn portion (bending portion) 8 of the corrugated fin is completely different from the conventional technique and is formed so as to be bent according to the position of each louver shown in FIG. Therefore, as shown in FIG. 4, the overall shape of the U-turn section is such that the unit fins are each louver 9 arranged in a waveform, and the louver cut section 10 is either the same as the U-turn section or very similar to the U-turn section. The depth of cut has reached a close position.

Next, the function of this corrugated fin will be explained. The corrugated fin of this example is shown in Fig. 4, and the marma cross section is shown in Fig. 5.
The shape is as shown in the figure. That is, the chevron-shaped cross-section louvers 9 are arranged in a wave shape.

Therefore, the incoming air flows between the fins as shown by arrow 11,
If the air flow that impinges on each louver is well mixed (the temperature distribution is uniform), it will be less affected by the temperature boundary layer formed in the front louver. Furthermore, since the airflow is not extremely bent,
There were no major separations or vortices. These effects improve the heat transfer performance of the fins and significantly reduce ventilation resistance. Furthermore, as mentioned above, in the present invention, the notch 1G of the louver can be maximized (the entire fin except the folded flat part becomes the louver), so the effect of the louver can be maximized. , the heat transfer performance is further improved compared to the conventional method. On the other hand, according to the present invention, a fin having excellent performance and having nine louvers as shown in FIG. 5 can be realized without using any special manufacturing method. For example, the conventionally used gear meshing system can be introduced, allowing high-speed production.

No. 6 shows another embodiment. That is, in this embodiment, the bent portion 8 is formed into a curved shape. In this case, the positional relationship of the individual louvers viewed from the direction of the incoming air is as shown in FIG.

As explained above, according to the present invention, the louvers are cut up to the bent portion of the corrugated fin, and a corrugated fin with the maximum length of the louver can be obtained, which greatly improves heat transfer performance and ventilation. The resistance can be reduced. It also has the advantage of being easy to manufacture using the gear meshing method, which has a high production speed.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a conventional heat exchanger, Figure 2 is a partial perspective view of a conventional corrugated fin, and Figure 3 is 1-1 in Figure 2.
Fill in the air circulation situation on the enlarged cross-sectional view of position 1, and make a circular cross-sectional view.
Fig. 4 is a partial perspective view of a corrugated fin showing one embodiment of this ejection, Fig. 5 is a sectional view showing the air circulation situation in an enlarged sectional view taken along the v-v position in Fig. s4, and Fig. 6 is another example. FIG. 1 is a partial front view of a heat exchanger using the corrugated fins shown in FIG. 6. FIG. 1... Corrugated tube / 2... Flat heat exchanger tube 3.
...Header 8...Folded flat part 9...
・Chevron L (cross-sectional louver-10...louver cut portion 11...direction of air passing between fins 12...curved cut portion 13
...Flat heat exchanger tube 14.15.16...Looper A・
...Inflow air direction representative Patent attorney Susuki 1) Toshiyuki Hayabusa 11

Claims (1)

[Claims] 1. In a corrugated heat transfer fin in which the fin plate is continuously bent into a hairbin shape, the fin plate is provided with a large number of cuts in a direction perpendicular to the flow direction of fluid flowing between the fins. A heat transfer fin in which the louvers are formed up to the bent portion by bending the cut end, and the height positions of the edges of adjacent louvers are shifted from each other. 2. The heat transfer fin according to claim 1, wherein the louver is formed at an obtuse angle with a ridge line at the center extending in the longitudinal direction of the louver. 3. The heat transfer fin according to claim 1, wherein the louver is formed in a curved shape with the top at the center in the longitudinal direction K1 of the louver. 4. The heat transfer fin according to any one of claims 1 to 3, wherein the louvers are arranged in a wave shape as a whole. 5. The heat transfer fin according to any one of claims 1 to 3, wherein the louvers are alternately arranged one above the other.