JPS6042301Y2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchanger, and more particularly to a heat exchanger for cooling lubricating oil for an internal combustion engine, hydraulic oil for an automatic transmission, etc. with cooling water or the like.

Prior art heat exchangers for internal combustion engines and automatic transmissions have tube plates formed by opposed cooling plates forming passages for lubricating oil, etc., into which inner fins are inserted.

This inner fin is formed by pressing a thin plate to form a large number of cuts of the same size, thereby forming a plurality of continuous peaks and valleys and rows of upright fins formed between these, and The inner fin material, in which the segments are alternately staggered, is cut into desired dimensions and shapes.

However, in the inner fin material having the structure as described above, the width of the upright fins formed by the cuts is very small in order to improve performance.

Therefore, when cutting such inner fin material,
The area near the cutting part is in the width direction of the material (perpendicular to the feeding direction)
It is deformed by shifting.

Therefore, when cutting out a part of the inner fin material to form an oil passage hole that communicates with an adjacent tube plate, the above-mentioned deformation reduces the cross-sectional area of the oil passage cutout, resulting in an increase in oil passage resistance. be.

Another drawback is that the life of the inner fin mold is shortened due to the occurrence of burrs during cutting.

An object of the present invention is to eliminate the above-mentioned drawbacks and to obtain a heat exchanger having inner fins that can be easily manufactured without reducing the efficiency of the heat exchanger.

The heat exchanger according to the present invention includes at least two cooling plates facing each other to form a fluid passage, and an inner fin made of a thin plate provided in the fluid passage, The fin has a plurality of upright fins in a plurality of rows formed by a plurality of notches, each row of said upright fins being staggered, and at least two rows of said upright fins having at least two rows of upright fins. The width is substantially larger than the width of the upright fins in other rows, thereby facilitating the processing of the inner fins.

Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Shown in FIGS. 1 and 2 is a heat exchanger according to the invention for cooling lubricating oil of an internal combustion engine.

This heat exchanger has cooling plates 3A, 3 made of stainless steel or the like mounted on a mounting bracket 1 having mounting holes IA.
Unit 3 of tube plate formed by B etc.
are integrally attached via spacer 2.

The tube plate unit 3 includes two cooling plates 3 facing each other to form an oil passage 4.
A, 3B and the inner fin 7 inserted into the oil passage 4
The reinforcing material 5 is shaped by attaching a brazing material to the reinforcing material 5 and wrapping the periphery of the reinforcing material 5.

Similar tube plate units 3 are stacked together with plates 6 interposed in between to form an integral structure.

The mounting bracket 1 is formed with an oil inlet hole 1C and an oil outlet hole 1D, and each cooling plate 3A.

3B has corresponding oil outlet holes 3C and 3D, and lubricating oil heated to high temperature by the engine flows into the oil cooler from the oil inlet hole 1C of the mounting bracket 1 as shown by arrow A. and cooling plate 3A, 3
It passes through the oil passage 4 from the oil inlet hole 3C of B, passes through the oil passage hole 3D and ID, and is discharged as shown by arrow A'.

On the other hand, cooling water is indicated by arrow 13. As shown in B', the oil flows along the outside of the cooling plates 3A and 3B and exchanges heat with the lubricating oil in the oil passage 4.

In the drawings, reference numeral 8 indicates an end plate.

Next, with reference to FIGS. 3 and 4, the inner fin 7
Explain the detailed structure of.

The inner fin 7 is formed by pressing a continuously conveyed thin iron plate or the like to form a row of peaks 7A, and then pressing again to form a plurality of consecutive rows of valleys 7B. A row of upright fins 7C, 7D is formed between 7A and the valley 7B, and each row of upright fins 7C', 7C'', 7C'''...
The inner fin material is manufactured by manufacturing an inner fin material such that the fins are alternately staggered, and cutting this material into desired dimensions and shapes.

That is, the inner fin material covers the end portion 1 of the inner fin 7.
In addition to being cut along 1A, a notch 10 that is continuous with the oil inlet hole 3C and the oil outlet hole 3D must also be formed by cutting.

The upright fin widths of 9° 9A of the upright fins 7C and 7D are all the same in the prior art, and are very narrow in order to improve heat exchange performance.

Therefore, when cutting the side portion 10A of the notch 10 to form the notch 10 in the inner fin 7,
If the inner fin 7 shifts in its width direction, the cut surface will come to the boundary surface of the adjacent upright fins, and the upright fins 7C,
It has the disadvantage that it easily deforms 7D, reduces the passage cross-sectional area, and increases oil flow resistance.

On the other hand, in the inner fin 7 according to the present invention shown in FIGS. 3 and 4, the width 9A of the upright fin 7D in the portion corresponding to the side 10A of the notch 10 and the side 11A of the inner fin 7 is different from the width 9A. It is larger than the width 9 of the upright fin 7C.

Therefore, by cutting along this row of inner fins 7D as shown in line C in FIG. 4, deformation of the cut edge can be effectively prevented, and a reduction in the area of the cut 10 can be avoided. .

As described above, according to the present invention, it is possible to obtain a heat exchanger whose inner fins are easily processed and which has improved heat exchange characteristics.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the heat exchanger according to the present invention, and Figure 2 is a cross-sectional view of the heat exchanger according to the present invention.
Figure 3 is a bottom view of the heat exchanger shown in the figure, Figure 3 is a plan view showing the main parts of the inner fin used in the heat exchanger shown in Figure 1, Figure 4 is the bottom view of the heat exchanger shown in Figure 3. FIG. 3 is an enlarged perspective view showing main parts of the inner fin. 1... Mounting bracket, 3... Unit, 3A, 3B... Cooling plate, 4...
... Lottery L7C ... Standing fin, 9,9
A... Standing fin width, 10... Notch part.

Claims (1)

[Scope of utility model registration request] At least two cooling plates are provided facing each other to form a fluid passage, and an inner fin made of a thin plate is provided in the bulk passage, and the inner fin is formed by a large number of cuts. and has a plurality of upright fins arranged in a plurality of rows, the rows of each upright fin are staggered, and the upright fin width of at least two rows of the upright fins is equal to the upright fin width of the other rows. A heat exchanger characterized in that it is substantially larger than the fin width.