JPS5995390A - Heat exchanger - Google Patents

Abstract

PURPOSE:To improve the efficiency of the heat exchanger and permit to make the large size heat exchanger by a method wherein flat U-shape connecting tubes, having no partitionings, are arranged at one or a plurality of places on the way from the inlet port of refrigerant to the outlet port of the same. CONSTITUTION:First flat tube 9 and the second flat tube 10, in which the path of fluid is divided into a plurality of paths by the partitionings, are connected by the flat U-shape connecting tube 11 having no partitioning. The refrigerant, flowing through the first flat tube partitioned by the intermediate partitionings, is mixed in the connecting tube and enters into the second flat tube partitioned by the intermediate partitionings. The refrigerant is not distributed uniformly in the flat tube partitioned by the intermediate partitionings and the temperature distribution in the heat exchanger become ununiform, however, the flow of the refrigerant is uniformed in the flat U-shape connecting tube, therefore, the efficiency of the heat exchanger may be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchanger that is used in an air conditioner and is composed of a plurality of flat tubes and fins.

Conventionally, this type of heat exchanger has been made of flat tubes (as shown in Figure 1).
1), fins (2), flat tube partitions (31.

It consists of a refrigerant passage (4) formed by a partition, a header (5), and a connecting pipe (6) that forms the refrigerant passage, and the flat tube and fins are fixed by brazing, etc. There is.

With this structure, the refrigerant flowing into the heat exchanger flows into the header through the connecting pipe.

Since the refrigerant flows through the respective channels independently up to the outlet, there is a large temperature difference between the air and refrigerant in section A of the refrigerant pipe on the air downstream side, and the heat exchanger is large. Since the air has already undergone some heat exchange in the α section of the refrigerant pipe, the temperature difference between the air and the refrigerant is small and the amount of heat exchange is small. Therefore, the heat exchange efficiency of the entire heat exchanger cannot be said to be good.

In addition, this type of heat exchanger is constructed by bending flat tubes, so it is impossible to manufacture large heat exchangers with a total length of 10 m or more, so it is not suitable for large air conditioners. It had drawbacks such as being unusable.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and is a flat U with no partitions at one or more places on the way from the refrigerant inlet to the outlet.
The object of the present invention is to provide a heat exchanger characterized by having a shape-shaped connecting pipe.

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 8, this invention includes a first flat tube (9), a second flat tube (11), a fin (2), and a partition p (31) of the flat tube.
, a refrigerant flow path (4) formed by an inner partition, a header (5), a connecting pipe (6) that connects the refrigerant circuit, and a flat U-shape without an inner partition that connects the first flat tube and the second flat tube. It is composed of connecting tubes, and the flat tube and the fins and the flat tube and the flat U-shaped connecting tube are fixed together by brazing or the like. With this structure, the refrigerant flowing through the first flat tube partitioned by the partition 9i mixes in the connecting pipe, and then flows into the second flat tube partitioned by the partition 9i. I will do it.

In this way, connecting pipes are installed at one or more places in the pipe flow path, so the distribution of refrigerant inside the pipe is poor, and even if the temperature distribution of the heat exchanger is uneven, it will not be possible to create a flat U-shape. If the heat exchanger efficiency is improved by uniformly distributing the flow at the pipe connecting pipe section, the result will be K.

Furthermore, since flat tubes are connected, it is highly effective in making it possible to manufacture large heat exchangers used in large air conditioners that require flat tubes over 10 m long.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a conventional heat exchanger, Fig. 2 is a nmn cross-sectional view of Fig. 1, Fig. 3 is a front view showing a heat exchanger according to the present invention, and Fig. 4 is a main part of the present invention. The enlarged view, FIG. 5, is a sectional view taken along the line V-V in FIG. 4. (11 is a flat tube, (2) is a fin, (a) is a first flat tube. Ql is a second flat tube, and Ql is a flat U-shaped connecting tube.
The same symbols in 1 indicate the same or equivalent parts. Agent Makoto Kuzuno - Figure 1 A ρ Figure 4 1θ Figure 5

Claims (1)

[Scope of Claims] +11 In a heat exchanger having a plurality of flat tubes whose passages are divided into a plurality of passages by partitions and fins,
A heat treatment device characterized in that a flat tube is provided at one or more locations on the way from the refrigerant inlet to the outlet, where the refrigerant flowing through each flow path is merged and then divided into multiple paths again. exchanger. (2) The heat exchanger according to claim 1, wherein a flat tube without a partition is provided in the U-shaped connecting tube portion.