JPH0216151Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a corrugated fin type heat exchanger as an air-cooled charge air cooler mainly used in internal combustion engines for automobiles. This tube has both ends passed through and a partition provided in the center to separate the inside of the tank into an inlet side and an outlet side, and the U-shaped bent part of the tube also has heat dissipation properties.

[Prior art]

As a conventional technique in which fins are also provided at the bent portion of a tube bent into a U-shape, the Japanese Patent Laid-Open No.
There was one described in Publication No. 47-9786. The heat exchanger described in this publication has a large number of plate fins arranged around the outer periphery of a circular tube, the fins and tubes are integrally connected to each other, and then each tube is bent into a U-shape. To manufacture such a heat exchanger, plate fins each having a tube hole joined thereto are arranged, and circular tubes are inserted into the tube insertion holes. By expanding the inner surface of the tube, the fins and the tube are integrally fixed. After this fixation, the tube is pressed along the U-shaped guide,
It was necessary to apply external force to bend it.

[Problem to be solved]

However, in such a U-shaped heat exchanger, there is a risk that the fins may collapse at the U-shaped bending portion, and the fin pitch between adjacent plate fins may occur on the center side of the U-shaped bending radius. There is a possibility that the fin pitches become narrower and may eventually come into contact, and the fin pitch becomes wider than necessary on the outside of the U-shaped bend.

Further, such a plate fin type heat exchanger is troublesome to manufacture and requires a large number of manufacturing steps, resulting in an expensive heat exchanger.

[Means for solving problems]

Therefore, this invention aims to solve the above problems.
In particular, in corrugated fin type heat exchangers, we focused on the fact that the corrugated fins themselves tend to curve in the direction of continuous wave propagation.
The purpose is to provide a heat exchanger that is easy to manufacture and has high performance without crushing the fins, and in order to achieve this purpose, the following configuration is adopted.

That is, the longitudinal central part of each flat surface is bent in advance into a U-shape so that the bottom of the groove is formed, and the grooves are formed at equal intervals so as to surround the outer part of the flat surface. A plurality of flat tubes 1 are arranged, each of which is made by bending a thin band-shaped metal plate so as to be flexible in advance, and a plurality of flat tubes including all the U-shaped portions are formed between the outer surfaces of each of the flat tubes 1, 1. A plurality of corrugated fins 3 whose crests and bottoms of the waves are in contact and fixed by brazing, a tube plate 2 through which both ends of each of the flat tubes 1 are penetrated, and the through portions are hermetically joined; One tank 4 whose opening edge is hermetically joined to the periphery of the plate 2 and partitioned so as to separate the outlet side and the inlet side of each flat tube 1 from each other.
This is a corrugated fin type heat exchanger comprising:

〔Example〕

Next, each embodiment of the present invention will be described based on the drawings.

FIG. 2 is a partially cutaway elevational view showing a first embodiment of the present invention. In this embodiment, a large number of flat tubes 1 are each bent into a U-shape in advance. The parallel portions of each flat tube 1 are formed to have the same length. At the same time, the radius of curvature of the curved portion of each flat tube 1 is made larger as the tube is located on the outer side, and each bent portion is formed into a substantially semicircular shape. Next, a corrugated fin 3 is arranged between each flat tube 1, 1. The corrugated fin 3 is generally made of an extremely thin metal plate of about 0.1 mm to 0.2 mm, which is bent into a wave shape, and a large number of louvers are cut and raised on the sides of the wave. It can also be bent freely in the direction of wave travel. Therefore, this corrugated fin 3 is interposed between a plurality of flat tubes 1, which are bent into a U-shape in advance. Note that the outer surface of the corrugated fin 3 or the outer surface of the flat tube 1 is coated with a brazing material in advance. The flat tube 1 and the corrugated fins 3 constitute a heat exchanger core. Then, the end of each tube is inserted into the tube insertion hole of the tube plate 2, and the tube is inserted into a high-temperature furnace while being supported as a whole with a suitable jig. Then, the brazing material on the surface of the flat tube 1 or the corrugated fin 3 is melted, and the parts are integrally brazed and fixed. Note that at this time, the tank 4 and tube plate 2 may be brazed together at the same time. Or flat tube 1
Only the corrugated fins 3 and tube plate 2 are brazed first, and then the tube plate 2
The tank 4 may be attached to the outer periphery, and the two may be separately brazed. This tank 4 has an inlet 7 and an outlet 8 at both ends, and a partition 6 between them. In this embodiment, charge air that has been compressed by the compressor of the supercharger and has become high temperature is introduced from the inlet 7. Next, the charge air flows downward in the tube located in the right half of the tube plate 2, then makes a U-turn and rises, and flows out to the left half of the tank 4.
The charge air is then supplied to the engine through the outlet 8. During this time, the charge air is cooled by the running wind that flows between the corrugated fins and the tube as the vehicle travels. put it here,
The entire circumference of the flat tube 1 closer to the center is shorter than that of the outer tube. however,
Since the flat tube on the center side has a smaller radius than the same radius on the lower end side in FIG. 2, the pressure loss at the bent portion becomes larger. On the other hand, the tube located on the outside has a long flow length, and the pressure loss is increased accordingly, but the radius of curvature is large, so the pressure loss at the bent portion is small. Therefore,
The difference between the flow resistance of the tube located in the center and the flow resistance located on the outside is not very large. or,
Since the flat tube 1 on the center side is located further away from the inlet 7 and outlet 8, the flow path becomes longer by that amount. Taking this into account, each tube is approximately uniform as a whole. It has a high flow resistance. Thereby, the flow rate of charge air in each tube is made uniform, and efficient heat exchange is performed. Next, FIG. 3 shows a second embodiment of the present invention, and the flat tube 1 of this embodiment has a slight linear portion formed on the lower end side in FIG. Thereby, the occupied space can be used more effectively. Further, the space of the tank 4 of this embodiment becomes narrower toward the center. This makes the flow rate of air flowing through each tube more uniform. Next, FIG. 4 shows a third embodiment of the present invention, in which corrugated fins 3 are disposed in contact with the tube 1a located at the center. The reason for providing this partition wall 5 is to prevent the heat of the corrugated fins on the inlet side from directly affecting the outlet side. That is, since the charge air is at a high temperature on the inlet side, the corrugate fins located there become even hotter. Furthermore, since the charge air in the tube is relatively low temperature on the exit side, the corrugated fins located there are relatively low temperature.
However, in FIG. 3, the corrugated fins in contact with the outlet tube at the center of the heat exchanger coincide with the corrugated fins in contact with the inlet tube. Therefore, in FIG. 3, the fluid passing through the central tube may be affected by the heat on the inlet side on the outlet side. Therefore, in the embodiment shown in FIG. 4, the partition wall 5 is provided to prevent the above-mentioned influence as much as possible.

[Effects of the invention] The heat exchanger of the invention has the above-described configuration and has the following effects.

In this heat exchanger, the tube is bent in advance into a U-shape, and both ends of the tube are communicated with the inlet side and the outlet side, respectively, with a partition of one tank as the boundary. A corrugated fin 3 is interposed between the flat tubes 1 and 1, including the U-shaped curved portion. Moreover, this heat exchanger has flat tubes 1 and 1.
are arranged in advance into a U-shape, and the corrugated fins 3 are arranged between them so that the ridgeline of each wave is directed in the width direction of the tube. Therefore, since the corrugated fins 3 are extremely easily curved along the direction of wave propagation, the fins can be reliably inserted into the U-shaped curved portion of the flat tube without being crushed, and can provide heat dissipation. It can be a good heat exchanger. Moreover, the heat exchanger is easy to manufacture and has high reliability.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a conventional heat exchanger, Fig. 2 is a partially cutaway elevational view of a heat exchanger of the present invention, and Fig. 3 is a partially cutaway elevational view of a second embodiment of the present invention. Figure 4 is the same number 3.
An elevational view of the embodiment. 1, 1a... Flat tube, 2... Tube plate, 3... Corrugated fin, 4... Tank, 5... Bulkhead, 6... Partition, 7... Inlet, 8...
…Exit.

Claims (1)

[Scope of utility model registration request] The longitudinal central part of each flat surface is bent in advance into a U-shape so that it forms a groove bottom, and is arranged at equal intervals so as to surround the outer part of the flat surface. a plurality of flat tubes 1, each of which is made by bending a thin band-shaped metal plate so as to be flexible in advance;
A plurality of corrugated fins 3 including all the U-shaped parts and having the tops and bottoms of a large number of waves in contact and fixed by brazing are inserted between the outer surfaces of each of the flat tubes 1, A tube plate 2 whose portions are hermetically joined;
A corrugated fin type heat exchanger comprising one tank 4 whose opening edge is hermetically joined to the periphery of the tube and which is partitioned to separate the outlet side and inlet side of each flat tube 1 from each other.