JP2002181464A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger which can relieve a thermal stress generated in a first fluid passage forming body (inner bar) caused by a sudden fall in temperature and can reduce it to an allowable stress or below and which can thereby prevent destruction of the first fluid passage forming body due to a repeated stress and is made free of the possibility of occurrence of a leak of fluid and deterioration of a pressure-resisting performance and excellent in durability, in regard to the heat exchanger used for an aftercooler or the like. SOLUTION: The heat exchanger 10 has a first passage A through which compressed air from a compressor, for instance, is made to flow and a second passage B through which outdoor air to be subjected to heat exchange with the compressed air is made to flow. The first fluid passage forming body 13 of the first passage A is formed of an aluminum extruded profile having a pair of side walls 15 and 15 for maintaining a space and an intermediate connecting wall 14 which connects the side walls 15 and 15 with each other and which is constituted of a plurality of tubular fins 16 connected in juxtaposition and each having a substantially circular cross section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger used for an aftercooler, an intercooler, an oil cooler, and the like.

[0002]

2. Description of the Related Art Conventionally, for example, as shown in FIGS.
This type of heat exchanger (30) is made of aluminum (including an aluminum alloy) and has an upper tank (31) having a fluid inlet (33) and a lower tank (32) having a fluid outlet (34). )
And a core part (41) intermediate between the two, and the core part (41) is cooled by outside air by forced air blowing by a fan (35) arranged on the back of the core part (41). I have.

As shown in detail in FIG. 6, the core portion (41) has a plurality of first flow paths (C) through which the first heat exchange fluid flows.
And a plurality of second flow paths (D) through which a heat exchange second fluid to be heat-exchanged with the first fluid flows, and the first flow path (C)
Are opposed to each other at a predetermined distance from each other, and a first fluid flow path forming body (so-called inner bar) (43) interposed between the flat plates (42) and (42). And a second flow path (D) is formed between the flat plates (42) and (42) opposed to each other at a predetermined interval, and the flat plates (42) and (42) 42) A pair of spacing members (so-called outer bars) arranged to correspond to the upper and lower edges of (42)
(50) and (50) and a corrugated fin (51) positioned in the middle between the both space holding members (50) and (50).

[0004] A first fluid flow path forming member (inner bar) (43) is disposed on a pair of side walls (45) (45) arranged to correspond to the front and rear side edges of the flat plate (42). ), And an aluminum extruded shape comprising a hollow connecting wall portion (44) constituted by a number of parallel rectangular cross-sectional rhombic fin portions (46) connecting the side wall portions (45) and (45) to each other. Was made.

When the above-mentioned conventional heat exchanger (30) is applied to an aftercooler, compressed air from a compressor is introduced as a first heat exchange fluid from a fluid inlet (33) to an upper tank (31). Then, all the first flow paths (C) of the core portion (41) are lowered to reach the lower tank (32), and are discharged from the fluid discharge port (34). , Core (4
As a result of forced air blowing by the fan (35) in the second flow path (D) in (1), the compressed air from the compressor passing through the first flow path (C) is cooled by outside air due to heat exchange. In this case, the compressed air introduced into the upper tank (31) from the fluid inlet (33) of the aftercooler (30) at a temperature of about 180 ° C. is usually supplied to all of the cores (41). While descending in the first flow path (C), the air is cooled by the outside air passing through the second flow path (D) by forced air blowing by the fan (35), lowered to 40 ° C., and reaches the lower tank (32).

[0006]

However, the aftercooler including the conventional heat exchanger (30) as described above is
It is sufficient to always operate in such a stable state.However, for example, the compressed air from the compressor may not flow due to the load, and the compressed air may not be supplied to the aftercooler (30). The first flow path (C) through which the compressed air flows in the section (41) is rapidly abruptly blown by the fan (35) despite the fact that compressed air is not supplied into the first flow path (C). Therefore, the temperature of the first fluid flow path forming body (inner bar) (43) decreases. On the other hand, the upper tank (31) and the spacing member (outer bar) (50) of the second flow path (D) located at the bottom of the upper tank (31)
Is difficult to decrease in temperature because of its large heat capacity. For example, in winter, the temperature difference between the two is 200 ° C.
It can be even by. In such a case, the first fluid flow path forming body (inner bar) (43) tends to shrink rapidly, but the space holding member (outer bar) (outer bar) (upper bar) between the upper tank (31) and the second flow path (D). Since the temperature of the portion 50) is high, and these portions cannot follow the first fluid flow path forming member (inner bar) (43) and contract, the upper tank (31)
Near the bottom of the upper tank (31), thermal stress occurs in the first fluid flow path forming body (inner bar) (43), and by repeating such a phenomenon, the first fluid flow path forming body (43) near the bottom of the upper tank (31). Inner bar) (43) Side wall part (45) (45)
In addition, there is a problem that cracks are generated in the rectangular tube fin portion (46) having a rhombic cross section, and there is a possibility that fluid leaks and a pressure resistance performance is reduced.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art. For example, when used in an aftercooler, a thermal stress generated in a first fluid flow path forming body (inner bar) due to a rapid temperature drop is reduced. The stress can be reduced and reduced to within the allowable stress, whereby the destruction of the first fluid flow path forming body (inner bar) due to repeated stress can be prevented, and fluid leakage can be prevented. An object of the present invention is to provide a heat exchanger that has excellent durability without causing any risk of occurrence or reduction in pressure resistance performance.

[0008]

In order to achieve the above object, a heat exchanger according to the present invention has at least one first flow path through which a first heat exchange fluid flows, and heat exchange with the first fluid. At least one second flow path through which a heat exchange second fluid to be flowed is provided, wherein the first flow path is interposed between flat plates facing each other at a predetermined distance from each other, and is interposed between these flat plates. And a second fluid passage formed by the first fluid passage forming body, the second fluid passage corresponding to a flat plate facing each other at a predetermined interval, and corresponding to a side edge portion interposed between the flat plates and facing the flat plate. In a heat exchanger made of aluminum formed by a pair of spacing members arranged so as to be arranged and a fin member interposed between the two spacing members, the first fluid flow path forming body is a flat plate. One that is arranged to correspond to the front and rear side edges And an intermediate connecting wall formed by a plurality of cylindrical fins having a substantially circular cross section, that is, a circular or elliptical cross section, which are connected in parallel and connect the both side walls for spacing. It is characterized by being made of an extruded aluminum section having a section.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.

In this specification, front and rear, left and right and up and down are based on FIG. 2, the front means the front side of the sheet of FIG. 2, the rear means the same back side, and the left means the left side and the right means the same. The upper side means the upper side of the figure, and the lower side means the lower side.

Referring first to FIG. 1, a heat exchanger (10) according to the present invention is made of aluminum (including an aluminum alloy) and has an upper tank having a fluid inlet (3).
(1), a lower tank (2) having a fluid discharge port (4), and a core part (11) intermediate between the two, and the core part (11)
The core portion (11) is cooled by the outside air by forced air blowing by a fan (not shown) arranged on the rear surface of the core.

As shown in detail in FIGS. 2 and 3, the core portion (11) of the heat exchanger (10) includes at least one first flow path (A) through which the first heat exchange fluid flows. At least one second flow path (B) through which a heat exchange second fluid to be exchanged with the first fluid flows is provided alternately.

The first flow path (A) is provided between the flat plates (12) and (12) made of aluminum brazing sheets facing each other at a predetermined interval, and between the flat plates (12) and (12). It is formed by the interposed first fluid flow path forming body (inner bar) (13).

The first fluid flow path forming body (inner bar) (13) has a pair of space holding side walls (15) arranged corresponding to the front and rear side edges of the flat plates (12) and (12). ) (15), a plurality of cylindrical fin portions (16) having a substantially circular cross section, that is, a circular cross section or an elliptical cross section, in which both side wall portions (15) and (15) are connected to each other and connected in parallel. And an intermediate connecting wall portion (14) constituted by an extruded aluminum member, and is provided with a front-rear spacing side wall portion (15) (15) of the first fluid flow path forming body (inner bar) (13). 15) and a cylindrical fin portion (16) having a substantially circular cross section of the intermediate connecting wall portion (14) are formed over the entire length of the first fluid flow path forming body (inner bar) (13) by flat plates (12) and (12). )
Is joined to.

On the other hand, the second flow path (B) is provided between flat plates (12) and (12) made of aluminum brazing sheets facing each other at a predetermined interval, and between the flat plates (12) and (12). A pair of spaced-apart holding members (outer bars) (20) (20) made of extruded aluminum material interposed and arranged on the upper and lower edges of the flat plates (12) and opposed to each other; And (20) a fin member (21) made of an aluminum louvered corrugated fin interposed between the (20) and (20) (20)
And a fin member (21) composed of corrugated fins are joined to the flat plates (12) and (12) over the entire length of the second flow path (B).

The core part (11) of the heat exchanger (10) according to the present invention.
, At least three flat plates (12) are used. Therefore, the smallest core part (11) of the heat exchanger (10) theoretically has one first flow path (A) and one second flow path (B). In the case of an aftercooler, an intercooler, and an oil cooler, for example, the heat exchanger (10)
It has 100 channels (A) and (B). Such a channel
The numbers of (A) and (B) are merely examples, and the number of both flow paths (A) and (B) is set according to the size and heat exchange performance of the heat exchanger (10).

Here, the overall size of the heat exchanger (10) is as follows:
Various sizes are set according to the required heat exchange performance in the used aftercooler, intercooler, oil cooler, and the like. The thickness of the flat plate (12) of the heat exchanger (10) is, for example, 0.5 to 1.5 mm, preferably 0.8 to 1.5 mm.
1.2 mm. The width in the left-right direction of the front-rear spacing side wall portions (15) (15) of the first fluid flow path forming body (inner bar) (13) is, for example, 3 to 12 mm, preferably 5 to 10 mm.
And the thickness in the front-rear direction is 20 to 120 mm, preferably 30 to 100 mm. The width in the left-right direction of the intermediate connecting wall portion (14) of the first fluid flow path forming body (inner bar) (13) is substantially equal to the width in the left-right direction of the front-rear space holding side wall portions (15, 15). The number of cylindrical fins (16) having a substantially circular cross section provided on the intermediate connecting wall (14) is 22, as shown, but is usually 10 to 80, preferably 10 to 60. It is. The thickness of each tubular fin (16) is, for example, 0.3 to 2 mm, preferably 0.5 to 1 mm. Further, the radius of curvature of the curved portion of the cylindrical fin portion 16 having a substantially circular cross section, that is, a circular cross section or an elliptical cross section is, for example, 0.1.
It is 5 to 2 mm, preferably 1 to 1.5 mm. on the other hand,
Upper / lower spacing member (outer bar) for second flow path (B) (20)
The width in the left-right direction of (20) is, for example, 5 to 30 mm, preferably 10 to 20 mm, and the thickness in the vertical direction is 5 to 2 mm.
0 mm, preferably 10 to 15 mm.

In the first fluid flow path forming body (inner bar) (13) of the heat exchanger (10) according to the present invention, the intermediate connecting wall portion is provided.
The curvature radius of the curved portion of the cylindrical fin portion (16) having a substantially circular cross section, that is, a circular cross section or an elliptical cross section provided in (14),
When the heat exchanger (10) is used in an aftercooler, if the heat exchanger (10) is in the range of 0.5 to 2 mm, the first temperature may drop due to a rapid temperature drop.
The thermal stress generated in the fluid flow path forming body (inner bar) (13) can be reduced, and can be reduced to within the allowable stress, whereby the first fluid flow path forming body ( The inner bar) (13) can be prevented from being destroyed.

When the heat exchanger (10) according to the present invention is applied to an aftercooler, compressed air from a compressor is introduced into the upper tank (1) from the fluid inlet (3) as a first heat exchange fluid. Then, it descends through the plurality of first flow paths (A) of the core part (11), reaches the lower tank (2), and is discharged from the fluid discharge port (4). Core (1
As a result of forced air flow by a fan (not shown) in the second flow path (B) of 1), the first flow path is caused by heat exchange.
The compressed air from the compressor passing through (A) is cooled by the outside air,
The compressed air introduced into the upper tank (1) from the fluid inlet (3) of the aftercooler (10) at about
While descending all the first flow paths (A), the air is cooled by the outside air passing through the second flow path (B) by forced air from a fan (not shown), lowered to 40 ° C. 2).

In the aftercooler including the heat exchanger (10), there is a case where the operating state is not stable, for example, the compressed air from the compressor does not flow due to the load and the compressed air is not supplied to the aftercooler (10). If this occurs, in such a case, the first flow path (A) through which the compressed air of the core portion (11) flows may be such that no compressed air is supplied into the first flow path (A). Not a fan (not shown)
As a result, the temperature of the first fluid flow path forming body (inner bar) (13) decreases.
On the other hand, the temperature of the space holding member (outer bar) (20) of the upper tank (1) and the second flow path (B) located at the bottom of the upper tank (1) decreases due to the large heat capacity. Difficult, so for example in winter, the temperature difference between the two
It can be up to 200 ° C. In such a case, the first fluid flow path forming body (inner bar) of the first flow path (A) (13)
In FIG. 3, the temperature of the space holding member (outer bar) (20) of the upper tank (1) and the second flow path (B) increases when the temperature of the upper tank (1) shrinks rapidly in the direction of arrow (a). Since these parts cannot follow the first fluid flow path forming body (inner bar) (13) and contract, the upper tank
Near the bottom of (1), thermal stress is generated in the first fluid flow path forming body (inner bar) (13) in the direction of arrow (b) in FIG. Intermediate connecting wall of the first fluid flow path forming body (inner bar) (13) of the passage (A)
Since the cylindrical fin portion (16) of (14) has a substantially circular cross section, it is generated in the first fluid flow path forming body (inner bar) (13) in the direction of arrow (b) in FIG. Thermal stress can be relieved and this can be reduced to within allowable stress. As a result, it is possible to prevent the first fluid flow path forming body (inner bar) (13) from being destroyed due to the repeated stress, and it is possible to prevent the leakage of the compressed air and the pressure resistance performance and to reduce the durability. It is a very good thing.

In the above embodiment, a pair of tanks is used.
A so-called vertical heat exchanger in which (1) and (2) are arranged vertically is shown.In addition, a so-called horizontal heat exchanger in which both tanks (1) and (2) are arranged left and right, and both tanks (1) and (2) may be used as a so-called horizontal installation type heat exchanger arranged in front and back.

The fin member (21) of the second flow path (B)
Is not limited to the corrugated fins, but may of course be constituted by fins of other shapes.

The heat exchanger (10) includes an aftercooler,
The present invention can be similarly applied to not only an intercooler and an oil cooler but also various types of heat exchangers that perform heat exchange between two kinds of fluids for gas and liquid.

[0024]

As described above, in the heat exchanger according to the present invention, at least one first flow path through which the heat exchange first fluid flows and the heat exchange second fluid to be heat-exchanged with the first fluid are used. At least one second flow path to be flowed, wherein the first flow path is formed by flat plates facing each other at a predetermined interval, and a first fluid flow path forming body interposed between the flat plates. The second flow path is formed and a pair of flat plates opposed to each other at a predetermined interval from each other, and a pair of spacing members interposed between the flat plates and arranged so as to correspond to opposite side edges of the flat plates. A pair of gaps formed by a member and a fin member interposed between the both spacing members, wherein the first fluid flow path forming body is arranged to correspond to the front and rear side edges of the flat plate. The side wall for holding and the side wall for both spaces are connected and connected in parallel. Those which are made of an aluminum extruded profile having an intermediate connecting wall portion constituted by a cylindrical fin portion of the plurality of cross-sections substantially circular linked,
When the heat exchanger according to the present invention is used for an aftercooler, a thermal stress generated in the first fluid flow path forming body (inner bar) due to a rapid temperature drop can be reduced,
This can be reduced to within the allowable stress, thereby preventing the first fluid flow path forming body (inner bar) from being destroyed due to repeated stress, which may cause fluid leakage and decrease the pressure resistance performance. The effect is that there is no danger and the durability is excellent.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a heat exchanger showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part of the heat exchanger.

FIG. 3 is an enlarged horizontal sectional view of a main part of the heat exchanger.

FIG. 4 is a schematic front view of a conventional heat exchanger.

FIG. 5 is a schematic side view of the heat exchanger.

FIG. 6 is an enlarged perspective view of a main part of the heat exchanger.

[Explanation of symbols]

 Reference Signs List A First flow path B Second flow path 10 Heat exchanger 11 Core part 12 Flat plate 13 First fluid flow path formation body (inner bar) 14 Intermediate connecting wall part 15 Interval maintaining side wall part 16 Cylindrical cross section Fin part 20 Spacing member (outer bar) 21 Fin member

Claims (1)

[Claims] At least one through which a heat exchange first fluid is flowed
A first flow path (A), and at least one second flow path (B) through which a heat exchange second fluid to be heat-exchanged with the first fluid flows. Are formed by flat plates (12) and (12) opposed to each other at a predetermined interval, and a first fluid flow path forming body (13) interposed between the flat plates (12) and (12). A second flow path (B) is interposed between the flat plates (12) and (12) facing each other at a predetermined interval, and the flat plates (12) and (12). ), A pair of spacing members (20) (20) arranged corresponding to the opposite side edges, and a fin member interposed between the two spacing members (20) (20).
(21), the first fluid flow path forming body (13) is arranged so as to correspond to the front and rear side edges of the flat plates (12) and (12). And the plurality of cylindrical fin portions (16) having a substantially circular cross section and connecting the two side wall portions (15) and (15) to each other and connected in parallel. ) And an intermediate connecting wall (1
(4) A heat exchanger characterized by being made of an extruded aluminum member having the following characteristics.