JPS6344696Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a Finch-Ube heat exchanger used in air conditioners, freezers, refrigerators, etc.

Structure of the conventional example and its problems As shown in Fig. 1, the conventional heat exchanger is composed of plate-shaped fins 1 arranged in parallel and refrigerant pipes 2 penetrating through these fins 1. 1 has a louver-shaped cut and raised piece 3 facing the airflow. The fins 1 are divided in places by the cut and raised pieces 3, and the heat transfer coefficient is improved due to the leading edge effect of the boundary layer. There was a problem that the improvement in transmission rate was also small.

Purpose of the invention The purpose of the invention is to improve the heat transfer coefficient of the fins of a finch tube heat exchanger, that is, to improve the capacity.

Structure of the invention In order to achieve this object, the present invention forms a long cut and raised piece in the direction perpendicular to the air flow on the plate fin, and this cut and raised piece is located between the refrigerant pipe arrays, and one side of the cut and raised piece is arranged in a direction perpendicular to the air flow. By bending or curving the fins so as to face the fins, the long holes after the fins are cut and raised divide the fins to obtain a boundary layer leading edge effect, improving the heat transfer coefficient. By arranging one side of the strip to face the airflow, the airflow is disturbed and the turbulence promoting effect is obtained, thereby improving the heat transfer coefficient. In this way, by using a kind of cut and raised piece, the leading edge effect of the boundary layer and the effect of promoting turbulence can be obtained at the same time, and the heat transfer coefficient can be improved, that is, the performance can be improved.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 3 to 6, reference numeral 10 denotes a plate-shaped fin, and a large number of these fins 10 are arranged in parallel, and a refrigerant pipe 11 is passed orthogonally through these fins to form a heat exchanger 12. The fins 10 have a large number of long cut and raised pieces 13 located upstream of the refrigerant pipes 11 in a direction perpendicular to the airflow, and one surface of these cut and raised pieces 13 is located between the refrigerant pipes 11 array. The cut and raised piece 13 is curved so as to face the airflow. Further, reference numeral 14 denotes a large number of elongated holes formed by cutting and raising a large number of cut and raised pieces 13 on the fin 10. The length of this elongated hole 14, that is, the length of the cut and raised piece 13, is slightly larger than the pitch between the refrigerant pipes 11, so that the tip of the cut and raised piece 13 extends into the elongated hole 14 of the adjacent fin 10. I'm getting into it.

In the above configuration, since the fins 10 are divided into many parts from the airflow by the many elongated holes 14 formed by the cut and raised pieces 13, the heat transfer coefficient can be improved due to the leading edge effect of the boundary layer. In addition, the cut and raised piece 13
Since one side faces the airflow and is located between the arrays of refrigerant pipes 11, the airflow is greatly disturbed, a turbulence promotion effect is obtained, and the heat transfer coefficient can be improved. Furthermore, since the cut and raised pieces 13 themselves also contribute to the heat transfer area, there is no necessity for the heat transfer area to decrease at all.

Therefore, due to the turbulent flow promotion effect of the cut and raised pieces 13 and the leading edge effect of the boundary layer due to the elongated holes 14 formed by the cut and raised pieces, the heat transfer coefficient is significantly improved and the heat transfer area is reduced. Since there is no such thing at all, the effect of being able to measure a large improvement in ability can be obtained.

Effect on the invention As is clear from the above explanation, the present invention has a cut and raised piece of a predetermined length formed on the plate fin in a direction perpendicular to the airflow, and this cut and raised piece is placed between the refrigerant pipe arrays. In addition, by bending or curving one side so as to face the airflow, heat is reduced by the effect of promoting turbulent flow due to the cut and raised pieces and the leading edge effect of the boundary layer due to the elongated hole formed by the cut and raised pieces. Since the transfer rate is significantly improved and the heat transfer area is not reduced at all, the effect is that the capability can be greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional heat exchanger, Fig. 2 is a perspective view of the main part of Fig. 1, Fig. 3 is a perspective view showing an embodiment of the heat exchanger of the present invention, and Fig. 4 is the same. 5 is a front view of FIG. 3, and FIG. 6 is a side view of FIG. 4. 10...Plate fin, 11...Refrigerant pipe, 1
3... cut and raised piece, 14... long hole.

Claims (1)

[Scope of utility model registration request] Consisting of a large number of plate fins arranged in parallel and a refrigerant pipe passing through the fins, a cut and raised piece of a predetermined length is formed on the plate fin in a direction perpendicular to the air flow, and this cut and raised piece is used to direct the refrigerant to the plate fin. A heat exchanger that is located between an array of tubes and is bent or curved so that one side faces the airflow.