JPH06159971A - Heat exchanger - Google Patents

Abstract

PURPOSE:To provide an aluminium heat exchanger for a car intercooler, in which an end part of respective flat pipe can be reinforced by an inner fin, at a time of a simultaneous soldering in a furnace, deformation of the flat pipes on the right and left outer sides can be effectively prevented, expansion of a core part as a whole can be minimized, and a header plate and the flat pipe can be soldered without fail, and which has an airtightness enough for preventing any leakage of fluid. CONSTITUTION:A flat pipe 2 is inserted through long holes 8 and 9 of header plates 6 and 7 of an upper and a lower headers so that the two ends of the flat pipe 2 can enter the header over a tip end of a rising wall part 11 and a tip end of a hanging-down wall part 12 on the periphery of the long holes 8 and 9. An inner fin 10, which is formed in wave-shape if viewed from the plane and inserted into the respective flat pipe 2, is designed to be longer than a distance X between the upper and the lower header plates 6 and 7, and also shorter than a distance Y between the tip end of the rising wall part 11 and that of the hanging-down wall part 12 of the header plates 6 and 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum heat exchanger used, for example, in an automobile intercooler.

In this specification, aluminum means
In addition to pure aluminum, it means an aluminum alloy.

[0003]

2. Description of the Related Art Conventionally, a heat exchanger made of aluminum of this type has a core portion composed of parallel vertical flat tubes and corrugated fins interposed between adjacent vertical flat tubes, upper and lower headers, It is equipped with side plates arranged on both the left and right sides, and when manufacturing heat exchangers, insert both the upper and lower ends of the flat tubes into the parallel long holes formed in the upper and lower header plates. The pipes are arranged in parallel, and corrugated fins are interposed between adjacent flat pipes to form a core part, which is combined with both left and right side plates, and the upper and lower header plates are covered with respective header bodies. After heat setting, all the heat exchanger components were brazed together in the furnace.

[0004]

However, during collective brazing in a furnace, among the combined heat exchanger components, especially the parallel flat tubes and corrugated fins of the core are Since it expands so that it expands to both the left and right outer sides, among the parallel flat tubes, the flat tubes on both the left and right outer sides are greatly deformed, and there is a gap between the long hole of the header plate and the upper and lower ends of the flat tube. Therefore, there is a problem in that brazing failure occurs between the peripheral portion of the long hole of the header plate and the flat tube, the airtightness is impaired, and fluid leakage easily occurs.

In addition, in recent years, the heat exchanger made of aluminum used for this type of intercooler and the like has thin components in order to reduce its weight. When the flat tube is made thin, the above problem becomes more serious.

The object of the present invention is to solve the above-mentioned problems of the prior art and to reinforce the end portions of each flat tube with inner fins, so that even in the case of collective brazing in a furnace,
It is possible to effectively prevent the deformation of the flat tubes on both the left and right sides, the expansion of the entire core portion is small, and it is possible to securely braze the peripheral portion of the long hole of the header plate and the flat tube. In order to provide a heat exchanger that is airtight, has no fluid leakage, has sufficient strength even when the flat tube is made thin, is lightweight, and has excellent durability. is there.

[0007]

In order to achieve the above-mentioned object, the present invention interposes between parallel vertical flat tubes containing corrugated inner fins when viewed from above and adjacent vertical flat tubes. The upper and lower headers are provided with parallel flat tube insertion slots facing each other. A rising wall portion protruding into the upper header is provided at the peripheral edge of the long hole of the plate, and a hanging wall portion protruding into the lower header is provided at the peripheral edge of the long hole of the lower header plate. Both ends of the flat tube are inserted into the headers so as to enter the header beyond the tips of the rising wall and the hanging wall, and the both ends of the flat tube are surrounded by the slots. The inner fins, which are closely attached to the rising wall portion and the hanging wall portion and are inserted into each flat tube, have a length longer than the interval X between the upper and lower header plates, and the rising walls around the long holes of both header plates. The gist is a heat exchanger that is shorter than the distance Y between the tip of the section and the tip of the hanging wall.

[0008]

According to the above heat exchanger, the length of the inner fin inserted into each flat tube is longer than the interval X between the upper and lower header plates, and the rising wall portion around the long holes of both header plates. Since it is shorter than the distance Y between the tip of the flat wall and the tip of the hanging wall, the end of the inner fin exists inside the end of each flat pipe inside the upper and lower headers. The ends of the flat tubes are reinforced by inner fins. Therefore, even when the brazing is performed in the furnace after the heat exchanger components are set in the furnace, deformation of the flat tubes is small, and in particular, deformation of the flat tubes on both the left and right sides can be effectively prevented, and the entire core portion can be effectively prevented. As a result, the peripheral edge portion of the long hole of the header plate and the flat tube can be reliably brazed. The heat exchanger obtained after brazing is sufficiently airtight and does not leak fluid.

[0009]

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

1 and 2, an aluminum heat exchanger according to the present invention is used as an intercooler for an automobile, for example.
It is used as (20), which is a vertical flat tube (2) arranged in parallel with the inner fins (10) having a corrugated shape when viewed from the plane and adjacent vertical flat tubes (2) interposed between the two. It is composed of a core part (1) made of corrugated outer fins (3) when viewed from the front, upper and lower headers (4) and (5), and side plates (13) and (13) arranged on the left and right outer sides. Has been done.

The upper and lower headers (4) and (5) are composed of upper and lower header bodies (4a) and (5a) each having a substantially box shape, and header plates (6) and (7) for closing the openings at one end thereof. .

In this embodiment, the header bodies (4a) and (5a) of the upper and lower headers (4) and (5) are made of aluminum plates.
The header plates (6) and (7) are made of an aluminum brazing sheet having a brazing material layer on both inner and outer surfaces. Further, each flat tube (2) is also made of an electric braided tube made of an aluminum brazing sheet having a brazing material layer on both inner and outer surfaces, and the outer fin (3) and the inner fin (10) are made of an aluminum plate. Also, each side plate (13)
Made of aluminum brazing sheet.

Header plates (6) for both upper and lower headers (4) (5)
Parallel holes (8) and (9) for inserting flat tubes are provided in the upper and lower parts of the upper header plate (6) so as to face each other by the burring process, and are formed in the peripheral portion of the long hole (8) of the upper header plate (6). Upper header (4)
A rising wall (11) protruding inside is provided,
A penetrating wall portion (12) protruding into the lower header (5) is provided on the peripheral portion of the elongated hole (9) of the lower header plate (7).

As shown in FIG. 3, in this embodiment, a so-called multi-entry fin is used as the inner fin (10), which is a row of corrugated concavo-convex portions (17) (18) when viewed from the plane. The fins (19) are formed in parallel with each other in the longitudinal direction of the fins (10) and are adjacent to each other and are formed in a state of being offset by half a pitch.

As shown in detail in FIG. 2, both ends (2a) (2b) of the flat tube (2) are placed in the elongated holes (8) (9) of the upper and lower header plates (6) (7) facing each other. ) Is inserted so as to enter the headers (4) and (5) beyond the tips of the rising wall portion (11) and the hanging wall portion (12). The length of the inner fin (10) inserted in each flat tube (2) is longer than the space X between the upper and lower header plates (6) and (7) and both header plates (6) ( 7) Long hole (8) (9) Peripheral rising wall (11)
It is made shorter than the distance Y between the tip of the and the tip of the hanging wall portion (12). Therefore, both upper and lower headers (4)
Inside the (5), the end portions (2a) and (2b) of the flat tubes (2) are provided with the end portions (10a) and (10b) of the inner fins (10).

As shown in FIG. 1, both upper and lower headers
(4) Rise the edge (2) around the edge of the header plate (6) (7) of (5).
4) and (24) are provided, and the required number of protrusions (25) for temporary fixing of the header body and side plates are provided at the upper edges of the rising edges (24) and (24) of each header plate (6) (7). A temporary fixing projection (26) is provided. An outer convex portion (27) having a substantially L-shaped cross section is provided on the peripheral edge of the opening of the header body (4a) (4b).

In the above, in order to manufacture the intercooler (20), first, both end portions of the flat tube (2) are placed in the elongated holes (8) and (9) of the upper and lower header plates (6) and (7) facing each other. (2a) (2b)
The rising wall (11) and the hanging wall (12) are inserted into the headers (4) and (5) over the tips thereof.

The upper and lower ends of the flat tube (2) have these long holes.
After being inserted into the (8) and (9), the pipes are expanded to be in close contact with the rising wall portion (11) and the hanging wall portion (12) at the periphery of the elongated holes (8) and (9).

As shown in FIG. 2, the length of the inner fin (10) inserted in each flat tube (2) is longer than the space X between the upper and lower header plates (6) and (7). In addition, the distance Y between the tips of the rising walls (11) and the tips of the hanging walls (12) at the periphery of the long holes (8) (9) of both header plates (6) (7) is made shorter. Therefore, inside the upper and lower headers (4) and (5), the end portions (2a) and (2b) of the flat tubes (2) have the end portions (10a) and (10b) of the inner fins (10). It's been
Ends (2a) (2b) of the flat tube (2) are reinforced by inner fins (10).

Then, inside the rising edges (24) (24) of the upper and lower header plates (6) (7), the header bodies (4a) (4b) are placed.
The outer protrusions (27) at the periphery of the opening of the are fitted together, and the protrusions (25) (25) for temporarily fixing the header body of the upper and lower header plates (6) (7)
Are bent inward, and the header body (4a) (4
The outer convex portions (27) (27) of b) are pressed down, the upper and lower header bodies (4a) (4b) and header plates (6) (7) are temporarily fixed to each other, and side plate temporary Stop projections (26) (26)
By folding back and engaging with each other, the left and right side edges of the upper and lower header plates (6) (7) and the upper and lower end portions of the left and right side plates (13) (13) are temporarily fixed to each other. It

After the setting of the intercooler constituent members is completed in this way, the whole intercooler constituent member is put into, for example, a vacuum brazing device, the inside of the furnace is maintained at a predetermined temperature, and these are collectively packaged by a vacuum brazing method. According to the present invention, the ends (10a) of the inner fins (10) are placed inside the ends (2a) and (2b) of the flat tubes (2) inside the upper and lower headers (4) and (5). ) (10b) is present, and the end portions (2a) (2b) of the flat tube (2) are reinforced by the inner fins (10), so when brazing in the furnace at one time,
There is little deformation of the flat tubes (2), especially the deformation of the left and right outer flat tubes (2) (2) can be effectively prevented.
(2) and the peripheral portions of the elongated holes (8) and (9) of the upper and lower header plates (6) and (7) are securely brazed. Therefore, the obtained intercooler (20) can be obtained without causing brazing failure.
Has sufficient airtightness, and there is no risk of leakage of charge air.

By the way, as shown in FIGS. 1 and 4, an inlet pipe (22) for the fluid of pressurized charge air is connected to the front side wall (14) of the upper header (4), header
Although the fluid discharge pipe (23) is connected to the right side wall of (4),
In this embodiment, as shown in detail in FIG.
Front wall of upper header (4) to reduce height of (4)
A long hole (height b) (21) that is long in the horizontal direction is provided in (14), and the fluid introduction pipe (the connecting end part is the same oval shape) is provided at the peripheral portion of this long hole (21). 22) is connected. Here, the fluid introduction pipe (22) is manufactured, for example, by bending an aluminum pipe and then performing swaging, or pressing with a mold so that the connection end portion has an oval shape.

[0023] Such an elongated hole (2
When the fluid introduction pipe (22) having the oval connection end is connected to the peripheral portion of (1), the front side wall (14) of the upper header (4) is connected.
In comparison with the conventional case in which a hole (diameter a) (30) having a perfect circular shape when viewed from the front, which is indicated by the one-dot chain line in the figure, is opened, the height of the upper header (4) is increased by ab. The height is low and the capacity of the upper header (4) is small, so the sound (so-called flowing sound)
There is an advantage that the generation amount of is reduced.

Incidentally, since the height of the upper header (4) can be lowered by the height of ab, on the contrary, the intercooler (20)
The overall height of the flat pipe (2) is increased by the lower height of the upper header (4), and the internal flow path for cooling is increased accordingly. Therefore, the cooling performance can be improved.

Fluid introduction pipe (22) of the intercooler (20)
From the above, when pressurized charge air is introduced into the upper header (4), the charge air flows into the flat tubes (2) in a larger number than the upper header (4), and each flat tube (4) 2)
While passing through the inside, it comes into contact with the tube wall and the inner fins (10), and is further heat-exchanged with the outside air via the outer fins (3) to be cooled. The cooled charge air is discharged from the fluid discharge pipe (23) through the lower header (5). In this case, the inner fin (10) consisting of multi-entry fins is housed inside the flat tube (2), so the heat transfer is very quick, and therefore the amount of heat dissipation is large and the cooling performance is excellent. ing. Besides, intercooler (20)
Is compact and its dimensions are small, so it does not require a large space for mounting on the body of an automobile,
This can contribute to higher performance and compactness of the automobile engine section.

FIGS. 5 and 6 show the case where the intercooler (20) is attached to the engine portion of an automobile. In the figure, a sealing plate (31) is interposed between the hood (34) and the intercooler (20) of the automobile. The sealing plate (31) is made of resin or metal, and the louver fins (33) are provided inside the rectangular frame (32).

In this case, the hood (34) of the automobile
Since the sealing plate (31) is interposed between the intercooler (20) and the intercooler (20) and the louver fin (33) is present inside the rectangular frame (32) of the sealing plate (31), the external Air (cooling air) can be uniformly and efficiently applied to the entire core part (1) of the intercooler (20), and therefore, there is an advantage that the cooling efficiency is significantly increased.

[0028]

As described above, the heat exchanger according to the present invention is interposed between the parallel vertical flat tubes in which the corrugated inner fins are housed in a plan view and the adjacent vertical flat tubes, and from the front. It has a core part consisting of corrugated outer fins, and upper and lower headers, and parallel header oblong holes for flat pipe insertion are provided in the header plates of both upper and lower headers so as to face each other. A rising wall protruding into the upper header is provided at the peripheral edge of the lower header plate, and a hanging wall protruding inside the lower header is provided at the peripheral edge of the elongated hole of the lower header plate. Both ends of the flat tube in the hole,
It is inserted so that it goes into the header beyond the tips of the rising wall and the hanging wall, and both ends of the flat pipe are closely attached to the rising wall and the hanging wall around the long hole and inserted into each flat pipe. The length of the inner fin is longer than the distance X between the upper and lower header plates, and shorter than the distance Y between the tips of the rising walls and the tips of the hanging walls of the elongated holes of the header plates. Since the end of the inner fin is made to exist in the end of each flat tube inside both headers,
The inner fins can greatly increase the strength of each flat tube, and therefore when brazing in a furnace at one time,
The expansion of the core portion is small, the deformation of the flat tubes on the left and right sides can be effectively prevented, and the header plate and the flat tubes can be reliably brazed. As a result, it is possible to obtain a heat exchanger having sufficient airtightness and excellent quality that does not cause fluid leakage. Also, for example, even when the components of the heat exchanger, especially the flat tube, are made thin, the end portions of the flat tube can be sufficiently reinforced by the inner fins, and therefore the heat exchanger has sufficient strength. Therefore, it is possible to reduce the weight.

[Brief description of drawings]

FIG. 1 is a partially exploded perspective view of an intercooler according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of the intercooler.

FIG. 3 is an enlarged perspective view of a partial cutaway main part of a flat tube containing an inner fin.

FIG. 4 is a front view of an intercooler according to the present invention.

FIG. 5 is a schematic cross-sectional view in which an intercooler according to the present invention is attached to a vehicle body of an automobile.

FIG. 6 is a schematic perspective view of a sealing plate to which an intercooler is attached.

[Explanation of symbols]

1 Core Part 2 Vertical Flat Tube 3 Outer Fin (Corrugated Fin) 4 Upper Header 5 Lower Header 6 Upper Header Plate 7 Lower Header Plate 8, 9 Flat Tube Insertion Long Hole 10 Inner Fin 11 Rising Wall Part 12 Hanging Wall Part 20 Intercooler (heat exchanger) X Distance between both upper and lower header plates Y Y Distance between tip of rising wall and tip of hanging wall

Claims (1)

[Claims] 1. An inner fin (10) which is corrugated when viewed from above
The parallel vertical flat tubes (2) and the adjacent vertical flat tubes (2) containing the cores (1) that are formed between the outer fins (3) and are corrugated when viewed from the front, and the upper and lower vertical flat tubes (3). Equipped with headers (4) and (5), the flat plate insertion slots (8) (9) in parallel with the header plates (6) (7) of the upper and lower headers (4) (5)
Are provided so as to face each other, a rising wall portion (11) protruding into the upper header (4) is provided at the peripheral portion of the long hole (8) of the upper header plate (6), and the lower header plate (6) is provided.
At the periphery of the long hole (9) of (7), a hanging wall part (12) protruding into the lower header (5) is provided, and both upper and lower header plates (6) (7)
The opposite ends of the flat tube (2) go beyond the tips of the rising wall (11) and the hanging wall (12) in the slots (8) (9) facing each other of the header (4) (5). The flat pipe (2) is inserted so that both ends of the flat pipe (2) are brought into close contact with the rising wall (11) and the hanging wall (12) at the periphery of the long holes (8) (9). ) The length of the inner fin (10) inserted inside is longer than the space X between the upper and lower header plates (6) (7) and the long holes (8) of both header plates (6) (7). ) (9) Rising wall around the edge (11)
A heat exchanger that is shorter than the distance Y between the tip of the and the tip of the hanging wall portion (12).