JPH0216153Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a laminated heat exchanger used, for example, in large oil coolers.

In this specification, aluminum is meant to include pure aluminum and aluminum alloys.

BACKGROUND ART In recent years, aluminum laminated heat exchangers have been widely used as large oil coolers. In this heat exchanger, a first fluid flow path through which oil passes and a second fluid flow path through which air flows in a direction perpendicular to the first fluid flow path are separated by a flat plate and are arranged vertically alternately. However, conventional heat exchangers
The tubes constituting the fluid flow path and the fins housed in the second fluid flow path between the tubes are joined together by vacuum brazing, and other fluid introduction headers, discharge headers, and It has been manufactured by joining a fluid inlet pipe, a discharge pipe, etc. by, for example, argon welding. However, such a conventional heat exchanger has a large number of welding points, and therefore its manufacture is very troublesome and time-consuming, requires skill in welding, and has a high manufacturing cost. In addition, since there are many welding points, liquid leakage is likely to occur due to poor welding, and there is also the problem that so-called spatter (aluminum pieces) generated when welding headers etc. enter the heat exchanger, impairing the performance of the heat exchanger. It was hot.

In order to solve such problems, the applicant first formed the header portions of the heat exchanger to be integrated into both the left and right sides of the first and second fluid flow paths, thereby making it possible to avoid welding. Therefore, it can be manufactured easily and inexpensively, and there is very little chance of liquid leakage, and there is no chance of foreign matter such as spatter getting into the container.It also has excellent pressure resistance. We also proposed a heat exchanger with good heat exchange performance.

Purpose of the invention The purpose of this invention is to make it possible to extremely easily bend the annular body forming one of the fluid flow paths in the heat exchanger previously proposed by the applicant, and to make it even easier to manufacture. It can be done, and
Heat treatment that causes less deformation at the bent portions (corners) of the annular body, and therefore good joints at the corner portions of the annular body, with no risk of liquid leakage, and that less material is used and manufacturing costs are low. We are trying to provide a replacement.

Structure of the Device In order to achieve the above object, the device alternately includes a first fluid flow path and a second fluid flow path that are separated by a flat plate and arranged orthogonally to each other. One of the heat exchangers is surrounded by an annular body for forming a fluid flow path that is approximately rectangular when viewed from a plane consisting of four corner portions and four side portions in the middle thereof; The gist of the heat exchanger is that notches are provided inside each of the four corner parts of the annular body, and the width of each corner part is narrower than the width of the side part.

Embodiment An embodiment of this invention will be described below based on the drawings.

In this specification, front and back, left and right, and top and bottom are based on FIG. 4, and the front means the lower side of FIG.
"Rear" refers to the upper side of the drawing, "left" refers to the left side of the drawing, "right" refers to the right side of the drawing, "top" refers to the front side of the drawing sheet, and "bottom" refers to the back side of the drawing sheet.

1 and 2, a heat exchanger 1 according to this invention is made of aluminum and is used, for example, as a large oil cooler. This heat exchanger 1 has first fluid passages A and second fluid passages B alternately in the vertical direction, separated by flat plates 3 made of aluminum brazing sheets.
Oil flows through the first fluid flow path A, and air flows through the second fluid flow path B. Both channels A and B are arranged so that these fluids flow orthogonally. There are header parts 2, 2 on both left and right sides of the heat exchanger 1.
are formed to be integrated into one.

That is, the first fluid flow path A of the heat exchanger 1 is interposed between flat plates 3, 3 which are arranged on both the upper and lower sides and have fluid passage holes 4, 4 at both left and right ends, and both flat plates 3, 3. It is formed by a first fluid flow path forming annular body 5 having an outer circumference of approximately the same shape and size as the flat plates 3, 3, and an inner fin 16 made of an extruded aluminum material disposed inside the annular body 5. has been done.

Here, as shown in FIGS. 4 to 6, the annular body 5 is approximately rectangular when viewed from a plane consisting of four corner portions 5a and four side portions 5b in the middle thereof. Four corner parts 5a of the annular body 5
A notch 6 is provided on the inside of each corner portion 5a, and the width of each corner portion 5a is narrower than the width of the side portion 5b.

In order to manufacture this annular body 5, as shown in FIG. After bending at the notch 6, both ends 15a, 15a are welded together. In this case, since the notch 6 is provided, bending of the bar 15 is extremely easy, and the shape of the upper and lower surfaces of this bent portion (corner portion) hardly changes. Therefore, even if the flat plates 3, 3 are stacked on both the upper and lower surfaces of the annular body 5 made in this way, no gap will be created.
It is possible to prevent liquid leakage from occurring.

On the other hand, as shown in FIGS. 7 and 8, for example, if the bar material that is the material of the annular body 25 is bent as it is, the upper and lower surfaces of the bent portion (corner portion) 25a are deformed so as to bulge, respectively. Therefore, it is necessary to flatten it by hitting it with a hammer or the like to make it flat like the side part 25b, which requires unnecessary effort, and even if such correction work is performed, the corner part 25a is not sufficiently formed. Since it is difficult to form a smooth surface, a gap may be formed between the upper and lower flat plates 3, 3 and the annular body, which may cause liquid leakage.

On the other hand, the second fluid flow path B includes a pair of flat plates 3, 3 arranged on both the upper and lower sides and having fluid passage holes 4, 4 at both left and right ends, and a pair of flat plates 3, 3 arranged on both the left and right sides between the two flat plates 3, 3. spacers 7, 7, and a corrugated spacer placed between both spacers 7, 7.
The fluid passage holes 4, 4 of the upper and lower flat plates 3, 3 are formed by the fins 8, and the left and right spacers 7, 7 have fluid passage holes 4, 4 of the upper and lower flat plates 3, 3.
Fluid passage holes 9, 9 communicating with are bored.
Therefore, the left and right header portions 2, 2 are connected to the fluid passage holes 4, 4 at both the left and right ends of the flat plate 3, the left and right end portions of the first fluid flow path forming annular body 5 without the inner fin 16, and the spacer. 7, 7 fluid passage holes 9, 9
It is formed by here,
The inner fin 16 housed in the first fluid flow path A is made of extruded aluminum and has a flat plate part and a large number of parallel convex parts provided orthogonally on both the upper and lower surfaces of the flat plate part. It is structured as follows. Further, a pair of upper and lower corrugated fins 8, 8 are arranged in the second fluid flow path B, and these fins 8, 8 are joined by an intermediate plate 10 made of an aluminum brazing sheet interposed between them. Ru.

A surface plate 11 made of a relatively thick aluminum plate having fluid passage holes 12 at both left and right ends is disposed at the upper end of the heat exchanger 1, and a relatively thick aluminum plate having no fluid passage holes at the lower end is disposed at the upper end of the heat exchanger 1. Meat surface plate (not shown)
is located.

The heat exchanger 1 includes flat plates 3, 3 made of aluminum brazing sheets, an annular body 5 for forming a first fluid flow path, inner fins 16, spacers 7, 7, and corrugated fins 8, 8. It can be manufactured by arranging the intermediate plate 10 and the upper and lower surface plates 11 in a superimposed state and joining them together by, for example, vacuum brazing.
Note that in this example, an aluminum brazing sheet is used as the flat plate 3;
However, the present invention is not limited to this, and an aluminum plate may be used as the flat plate 3, and a brazing material layer may be formed on the required upper and lower surfaces of the heat exchanger constituent members such as the flat plate 3, the first fluid flow path forming annular body 5, and the spacer 7. It is also possible to form the brazing filler metal layer by brush coating or the like, and to bond the entire heat exchanger 1 with this brazing filler metal layer.

In the heat exchanger 1, oil is introduced, for example, from the header 2 on the left side. The oil flows from the left header section 2 through all the first fluid channels A in parallel flow and is discharged from the right header section 2.
On the other hand, air is allowed to pass through the second fluid flow path B by forced ventilation by a fan or by natural ventilation caused by running a vehicle or the like.

Such a heat exchanger 1 is used as an oil cooler, for example, to cool engine oil, industrial machinery, or oil in various hydraulic systems.

The first fluid flow path forming annular body 5 may have a U-shaped cross section, for example, as shown in FIG.
In this case, both the upper and lower horizontal walls 1 of the corner portion 5a
Notches 6 and 6 are provided in 3 and 13, respectively.
Further, the annular body 5 is, for example, as shown in FIG.
It may have a cross-sectional shape, in which case cutouts 6, 6 are provided inside the upper and lower horizontal walls 14, 14 of the corner portion 5a, respectively. In the latter case, the notch 6 is located on the horizontal wall 1 of the corner portion 5a.
4, 14 may be provided on both the inside and outside sides.

In each of the above embodiments, a so-called horizontal oil cooler in which the first fluid flow path A is arranged horizontally is shown, but this invention is a vertical type oil cooler in which the first fluid flow path A is arranged vertically. The same applies to oil coolers. Furthermore, the heat exchanger according to this invention is applicable not only to oil coolers but also to various heat exchangers that perform multiple types of heat exchange with gas and fluid.

Effects of the invention As described above, this invention alternately includes the first fluid flow path A and the second fluid flow path B which are separated by the flat plate 3 and arranged orthogonally to each other, and both flow paths A,
One of the four corner portions 5 of B
an annular body 5 for forming a fluid flow path, which is substantially rectangular when viewed from a plane, and is composed of
The heat exchanger is surrounded by a heat exchanger, and notches 6 are provided inside each of the four corner portions 5a of this annular body 5, and the width of each corner portion 5a is made narrower than the width of the side portion 5b. Since the annular body 5 forming one of the fluid flow paths can be bent very easily, the heat exchanger can be manufactured even more easily, and the bent portion of the annular body 5 can be (Corner portion) 5a is less deformed, and therefore the processing accuracy at the corner portion 5a of the annular body 5 is high, and the bonding with the flat plate 3 is extremely good, and there is no risk of liquid leakage. In addition, since the notches 6 are provided at the four corner portions 5a, less material is required and the manufacturing cost of the heat exchanger is reduced.

[Brief explanation of the drawing]

Fig. 1 is a partial perspective view of a heat exchanger showing the first embodiment of this invention, Fig. 2 is an exploded perspective view showing the flow path configuration of the middle part of the heat exchanger of Fig. 1, and Fig. 3 is a A partially enlarged plan view showing the material of the annular body for forming a flow path,
FIG. 4 is a plan view of the annular body, FIG. 5 is an enlarged sectional view taken along the - line in FIG. 4, and FIG. 6 is a plan view of the annular body.
FIG. 7 is an enlarged sectional view taken along the line, FIG. 7 is a plan view of the annular body of the reference example, FIG. 8 is an enlarged sectional view taken along the line of FIG. FIG. 10 is an enlarged perspective view of the main part of the annular body in the third embodiment. 1...Heat exchanger, 2...Header part, A...1st
Fluid channel, B...second fluid channel, 3...flat plate,
4, 9... Fluid passage hole, 5... Annular body for forming a first fluid flow path, 5a... Corner part, 5b... Side part, 6... Notch, 7... Spacer, 8... Corrugate・Fin.

Claims (1)

[Scope of utility model registration request] The first fluid flow path A and the second fluid flow path B are alternately separated by a flat plate 3 and arranged orthogonally to each other, and either one of the flow paths A and B is
A heat exchanger surrounded by an annular body 5 for forming a fluid flow path that is approximately rectangular when viewed from a plane consisting of four corner parts 5a and four side parts 5b in the middle thereof, and this annular body 5 The four corner parts 5a of
A heat exchanger in which notches 6 are provided on the inside of the heat exchanger, and the width of each corner portion 5a is narrower than the width of the side portion 5b.