JPS61153391A - Heat exchanger - Google Patents

Abstract

PURPOSE:To contrive to improve the heat transfer by accelerating the turbulence in the boundary layers produced on the surfaces of fins by a structure wherein the titled heat exchanger consists of the fins, on the surface of each of which a plurality of protuberant surfaces are provided and a large number of which are arranged in parallel to one another, and a heat transfer medium pipe, which pierces through each fin twice. CONSTITUTION:Heat is exchanged between the air flow C running among small piece fins 3 and the heat transfer medium running within a heat transfer medium pipe 2. At that time, because the fins 3 are divided in the direction of the air flow C, the boundary layer leading edge effect is generated. Further, due to a large number of hemispherical protruded surfaces arranged in zigzags on the surface of each fine 3, the air flow C runs along said protruded surfaces, resulting in accelerating the turbulence in the boundary layer produced on the surface of each fin and consequently improving the heat transfer on the surface of the fin 3. Furthermore, because the air flow C runs along the hemispherical protruded surfaces 4, the increase in draft resistance is suppressed markedly. In addition, because the turbulent flow is also accelerated by the zigzag arrangement of the heat transfer medium pipe, the improvement of the heat transfer is contrived.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a fin-tube heat exchanger used in air conditioners, freezers, refrigerators, and the like.

2. Description of the Related Art In recent years, the performance of heat exchangers has improved dramatically, and among fin-tube heat exchangers, staggered pipe heat exchangers and completely independent fin heat exchangers have already been put into practical use.

Hereinafter, the conventional heat exchanger as described above will be explained with reference to the drawings.

FIG. 7 shows a conventional heat exchanger. In FIG. 7, reference numeral 1 denotes a large number of small fins arranged in parallel, which are divided into rows in the inlet direction of the air flow. Reference numeral 2 denotes heat medium pipes passing through the small piece fins 1, which are arranged in a staggered manner.

The operation of the heat exchanger configured as above will be described below.

Heat exchange occurs between the airflow A flowing between the fins of the small piece fins 1 and the heat medium flowing inside the heat medium pipe 2. At this time, since the small piece fins 1 are divided in the air inflow direction, a boundary layer leading edge effect is obtained to improve heat transfer. Furthermore, since the heat medium pipes 2 are arranged in a staggered manner, the flow of the airflow A is disturbed, thereby achieving an effect of improving heat transfer.

Problems to be Solved by the Invention However, the above configuration has the disadvantage that the effect of improving heat transfer is small due to the boundary layer formed on the surface of the small piece fin 1.

SUMMARY OF THE INVENTION In view of the above drawbacks, it is an object of the present invention to provide a heat exchanger that can significantly improve heat transfer.

Means for Solving the Problems In order to achieve this object, the heat exchanger of the present invention has a plurality of protruding surfaces arranged between the heat medium tubes on the surface, a large number of fins arranged in parallel, and a plurality of fins arranged in parallel. It consists of a heat transfer pipe that passes through the fins.

Effect: This configuration promotes turbulence in the boundary layer that occurs on the fin surface, resulting in a significant improvement in heat transfer through the fin.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows a heat exchanger in one embodiment of the present invention. In FIG. 1, numeral 3 denotes a large number of small fins arranged in parallel, which are divided into rows in the direction of airflow C. Reference numeral 4 denotes a hemispherical protrusion surface provided on one side surface of the small piece fin 3, which is provided in large numbers in a staggered arrangement. Note that reference numeral 2 denotes a heat medium tube, which has the same structure as the conventional one.

The operation of the heat exchanger configured as above will be described below.

Heat exchange occurs between the airflow C flowing between the fins of the small piece fins 3 and the heat medium flowing inside the heat medium tube 2. At this time, since the small piece fins 3 are separated in the direction of the airflow C, a boundary layer leading edge effect is obtained.

Furthermore, since the airflow C flows along the hemispherical protruding surfaces 4 due to the large number of hemispherical protruding surfaces 4 provided in a staggered manner on the surface of the small piece fin 30, the hemispherical protruding surfaces 4 are provided in a staggered manner. Therefore, the disturbance in the boundary layer generated on the surface of the small piece fin 30 is promoted, and the heat transfer on the surface of the small piece fin 3 is greatly improved. Furthermore, since the airflow C follows the hemispherical protrusion surface 4, the increase in ventilation resistance is kept extremely small. Furthermore, heat transfer is improved by promoting turbulence by the staggered arrangement of the heat medium tubes 2.

As described above, according to the present embodiment, by providing a large number of hemispherical protruding surfaces 4 in a staggered manner on the surface of the small piece fins 30, disturbances in the boundary layer occurring on the surface of the small piece fins 3 are promoted, thereby improving heat transfer. You can get improvement.

In addition, in this embodiment, the hemispherical protruding surface 4 is the small piece fin 3.
Although it was applied only to one side of the hemispherical protruding surface 4, the small piece fin 3
It is also possible to use both sides.

Further, in this embodiment, the protrusion surface is a hemispherical protrusion surface 4, but
As other embodiments, the protrusion surface may be a cylindrical protrusion surface 5 shown in FIG. 4, a conical protrusion surface 6 shown in FIG. 5, a diamond-shaped protrusion surface 7 shown in FIG. The same effect can be obtained.

Effects of the Invention As described above, the present invention greatly improves heat transfer by providing a plurality of protruding surfaces on the fin surface at positions between the heat medium tubes, thereby promoting turbulence in the boundary layer that occurs on the fin surface. It can be obtained, and its practical effects are similar to that of a dog.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a heat exchanger in an embodiment of the present invention;
Fig. 2 is a sectional view of the main part showing the small piece fin in Fig. 1, Fig. 3 is a sectional view of the main part showing the shape of the hemispherical protrusion surface of Fig. 2,
The figure is a perspective view of a cylindrical protrusion surface in another embodiment of the invention, FIG. 5 is a perspective view of a conical protrusion surface in another embodiment of the invention, and FIG. 6 is a perspective view of a conical protrusion surface in another embodiment of the invention. FIG. 7 is a perspective view of a diamond-shaped protrusion/protrusion surface, and FIG. 7 is a perspective view of a conventional heat exchanger. 2... Heat medium pipe, 3... Small piece fin,
4... Hemispherical protrusion surface, 5... Cylindrical protrusion surface, 6... Conical protrusion surface, 7...
Diamond-shaped protruding surface. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 44 Figure ¥: J5 Figure 6

Claims (1)

[Claims] A heat exchanger comprising a large number of fins arranged in parallel and heat medium tubes passing through the fins, and a plurality of protruding surfaces provided on the surface of the fins at positions between the heat medium tubes.