JPS5838718B2 - Jiraishikinetsukoukanki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-cooling heat exchanger that exchanges heat by natural convection of room-temperature air and does not require operating costs.

Conventional self-cooling heat exchangers are made by arranging a large number of iron round pipes or flat pipes in parallel to form a heat exchange panel, or by combining two pressed iron plates with recesses for multiple passages, for example into an oval shape. The main structure is to form multiple fluid passages in parallel and then weld multiple sheets in parallel to form a heat exchange panel, and heat radiation to the air side is only from the outer surface area of each pipe or iron plate, that is, the primary surface area. However, the heat transfer efficiency was poor.

Therefore, although the heat transfer efficiency can be improved by increasing the capacity of the heat exchange panel and increasing the outer surface area, it has not been possible to increase the size due to constraints on installation space, weight, and manufacturing cost.

In addition, expanding the secondary surface area by adding fins, etc. to the surface of the above-mentioned pipes or steel plates not only complicates the manufacturing process and increases costs, but also makes it difficult to construct the heat exchange panel and increases its size. Because of this problem, the expansion of the secondary surface area was minimal.

In other words, it is difficult to use a self-cooling type heat exchanger that exchanges heat with a refrigerant such as fluorocarbons in a place where the heat exchange efficiency is poor and the installation space is limited, such as under the floor of a railway vehicle. The applications of cold heat exchangers were limited.

On the other hand, there are countercurrent heat exchangers that have a structure in which the ends of two flat plates are closed with a spacer bar to form a fluid passage, and a plurality of these are stacked.
Even when the above-mentioned fluorocarbons and air were made to flow countercurrently, natural convection was difficult to occur and the thermal efficiency was extremely poor, making it completely unsuitable for self-cooling heat exchangers.

In view of the above-mentioned problems, the present invention aims to provide a self-cooling heat exchanger that significantly expands the secondary surface area of the heat exchanger, improves thermal efficiency, and expands its application without increasing the dimensions or weight. Furthermore, the main objective is to have a configuration in which the component parts are easy to manufacture and the heat exchanger can be easily formed.

That is, the present invention provides a joining end portion in which a plurality of rectangular radiation fins are erected at regular intervals on one side of a plate, and at least one of the end surfaces of the plate parallel to the radiation fins is thicker than the plate thickness. At least two pairs of aluminum heat dissipation panels each having a concave or convex portion forming a mating end surface with an adjacent heat dissipation panel are placed facing each other with their respective heat dissipation fins facing outward. A self-cooling type heat sink that consists of two parallel heat dissipation panels that are integrated at the joint end, and a fluid passage formed by closing the opposing air gap around the end of the heat dissipation panel with a side hole, except for the fluid inlet and outlet. It is an exchanger.

Below, the basic type of the self-cooling heat exchanger according to the present invention will be explained in detail based on the drawings.

FIG. 1 and FIG. 2 are explanatory top views of the heat exchanger according to the present invention, and show examples using two and three pairs of heat radiation panels, respectively.

The heat dissipation panel 1 has strip-shaped heat dissipation fins 2 erected at regular intervals on one side of the plate, and a joint end for arranging the heat dissipation panels in parallel on the end surface of the plate parallel to the heat dissipation fins 2. The portion 3 is made thicker than the thickness of the panel 1.

That is, the heat dissipation panel shown in FIG. 1 is provided on one end surface of the plate, and the heat dissipation panel shown in FIG. 2 is shown provided on one end surface and both ends.

The configuration is such that air flows between the heat radiation fins 2.

A fitting end surface 4 for joining a plurality of heat dissipating panels 1 in parallel is formed at the joint end 3 of the heat dissipation panel 1, and in the figure, a convex portion having a triangular cross section or a concave portion into which the convex portion can fit is formed. It is shaped.

In Fig. 1, two heat dissipation panels 1 described above are integrated at their joint ends 3 to form one panel, and these two panels are arranged facing each other at a constant interval with their respective heat dissipation fins 2 facing outward. The end portion is an opening, the side end portion is closed with a side par 5, and a vertical fluid passage 6 is formed between the panels.

That is, the heat exchanger of the present invention can be constructed by arranging a pair of heat dissipation panels facing each other with their respective heat dissipation fins facing outward, and closing the periphery with a side par except for the fluid inlet/outlet to form a fluid passage. In Fig. 1, two pairs of heat dissipation panels 1 are used, which is equivalent to the heat exchange unit of the embodiment, and in Fig. 2, three pairs of heat dissipation panels 1 are used to configure a long heat exchanger. There is.

Wave-shaped fins I are inserted into the fluid passage 6 to improve heat transfer efficiency.

In addition, instead of the corrugated fins 7, as shown in FIG. 3, channel fins 8 are formed on the opposite side of the heat dissipation panel 1 from the heat dissipation fins 2 at an interval of 20 times the heat dissipation fins, and one pair of channel fins 8 are provided. When the fluid passage 6 is constructed by opposing the heat dissipation panels 1 , the in-passage fins 8 can be formed within the fluid passage 6 at equal intervals with the heat dissipation fins 2 .

The heat dissipation panel 1 having the above configuration can be easily manufactured by using an extruded aluminum member, and the heat dissipation fins can be provided on the heat dissipation panel depending on the dimensions, installation location, type of fluid, etc. of the self-cooling heat exchanger. The size of the heat exchanger, the fin spacing, the size of the heat dissipation panel itself, the number of parts to be combined, etc. can be appropriately selected, and assembly into a heat exchanger can be easily manufactured by, for example, joining each part together by brazing.

Further, the fitting end surface 4 of the joining end portion 3 has the above-mentioned configuration.
When configuring a heat exchanger, the heat radiation panels 1 can be easily fitted together, the joint strength is high when they are joined together by brazing, and there is no leakage even when high-pressure refrigerant such as fluorocarbon is passed through the fluid passage. It may be of any shape.

The self-cooling type heat exchanger according to the present invention can function as a heat exchanger even if it is configured with one pair of heat radiation panels, or it can be assembled with multiple pairs of heat exchange units, and multiple sets of these can be connected in parallel to generate one heat exchanger. Can be configured into an exchanger.

In either case, the heat dissipation area is significantly expanded by the secondary surface area of the heat dissipation fins added to the primary surface area of the heat dissipation panel, resulting in high heat transfer efficiency compared to a conventional self-cooling heat exchanger of the same capacity. This is a highly efficient self-cooling type heat exchanger that can be made compact and lightweight because it is made of extruded aluminum material.

Examples will be described below based on the drawings.

FIG. 4 is a partially vertical perspective view of the self-cooling heat exchanger according to the present invention.

Two types of heat dissipation panels 1 with different angles of inclination at the upper and lower ends are integrated at the joint end 3 to form one panel with the upper and lower ends inclined at a constant angle, and these two panels are each The heat dissipation fins 2 face outward and face each other at regular intervals, and the upper and lower and side ends are closed with side pars 5 to form a vertical fluid passage 6 between the panels. A box-shaped heat exchange unit 1 in which corrugated fins 7 are inserted and a fluid inlet/outlet is opened at the end of the slope of the heat dissipation panel 1.
It consists of 1.

Four of these heat exchange units 11 are arranged in parallel and connected by a common upper header 9 and lower header 10 at the fluid inlet and outlet portions, and an inclined flow path is formed between the inside of the eight body and the upper part of the fluid passage. It is assembled into a box-shaped self-cooling heat exchanger that enables even distribution of heat.

In the configuration of this heat exchanger, fluid flows from the upper header 9 into the fluid passages 6 of each heat exchange unit 11 in a distributed manner, flows down the same passages, and flows out from the lower header 10. During this time, a large number of heat radiation fins 2 Heat is exchanged with the air that naturally convects between the two.

This heat exchanger has a box-shaped structure and is compact, but each heat exchange unit has a large number of heat radiation fins, which significantly expands the heat radiation area and has high heat transfer efficiency. Compared to conventional self-cooling heat exchangers, it is smaller and more efficient at the same time, and since it is made of aluminum, it is also lighter in weight. It can be used as a self-cooling heat exchanger for refrigerants.

[Brief explanation of the drawing]

1 and 2 are explanatory top views of the self-cooling type heat exchanger of the present invention, FIG. 3 is a cross-sectional view thereof, and FIG. 4 is a partial longitudinal sectional view of the embodiment. In the figure, 1... heat dissipation panel, 2... heat dissipation fin, 3...
...Joining end, 4...Mating end surface, 5...Side bar, 6...Fluid flow path, 7°°° corrugated fin, 8...Fin in passage, 9...Top Header 10... Lower header 11... Heat exchange unit.

Claims (1)

[Claims] 1. A plurality of rectangular radiation fins are erected at regular intervals on one side of the plate, and at least one of the end surfaces of the plate parallel to the radiation fins is provided with a joint end that is thicker than the plate thickness. At least two pairs of aluminum heat dissipation panels each having a concave or convex portion forming a mating end face with an adjacent heat dissipation panel are arranged in parallel and facing each other with at least two pairs of heat dissipation fins facing outward. A self-cooling heat exchanger in which heat dissipation panels are integrated at their joint ends, and a fluid passage is formed by closing the opposing air gap around the end of the heat dissipation panel with a side bar, except for the fluid inlet and outlet.