JPH09310997A - Laminated heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a poor connection from being generated while an integral brazing operation is being performed when a socket for connecting either a fluid flowing-in pipe or a fluid flowing-out pipe is fixed to an end part of a side plate, further suppress material expenditure and machining cost low and provide an advantageous effect in view of cost. SOLUTION: Two fluid feeding-in or discharging holes 8 communicated with a header part 2b are formed in parallel at an end part 7c of a side plate 7 having stepped portions 7a near both right and left ends in a laminated heat exchanger 1. To an outer surface of this side plate end part 7c is brazed a spacer 10 comprised of plate member having the same thickness as that of the stepped portions 7a and further having a communicating long hole 11 communicated with either all the fluid flowing-in or flowing-out holes 8. A horizontal section 12a of a bracket 12 for fixing a heat exchanger having at its end part a socket connecting circular hole 13 communicated with the communicating long hole 11 is brazed over the outer surface of the spacer 10 and the outer surface of an intermediate section 7b of a length of the side plate. One end of the socket 15A for connecting a fluid flowing-in or flowing-out pipe having a female threaded part 16 is connected while it is being fitted to the circular hole 13.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As a laminated heat exchanger, a so-called drone cup type in which a plurality of plates having header forming recesses at the ends thereof are laminated is conventionally known. It is widely used mainly for relatively small heat exchangers because it has various advantages such as excellent mass productivity, low cost, light weight, and improvement in assembly work efficiency by standardization.

By the way, some of the drone cup type laminated heat exchangers are provided with two or more header forming recesses in parallel at the end of the intermediate plate due to the problem of pressure resistance. However, in that case, two or more fluid introduction or discharge holes are formed in parallel at the end portion of the side plate in correspondence with the recess for forming the header, and the aluminum extrusion is performed on the outer surface of the end portion of the side plate. A block-shaped fluid inlet or outlet pipe connection socket made of a shape member or the like was jointed together with heat exchanger body components such as an intermediate plate and a side plate by collective brazing (JP-A-7-198289, etc.). reference).

[0004]

However, since such a block-shaped socket has a considerably large heat capacity as compared with the plate constituting the heat exchanger body, it is apt to cause a joint failure during collective brazing. was there.

Further, such a block-shaped socket has a problem in terms of cost because of high material cost and processing cost.

An object of the present invention is to solve the above problems.

[0007]

According to the present invention, two or more fluid introduction or discharge holes communicating with the header portion are formed in parallel at the ends of the side plates having steps near the left and right ends. In the laminated heat exchanger, a spacer made of a plate-like body having the same thickness as the step of the side plate and having a communication elongated hole communicating with all fluid introduction or discharge holes on the outer surface of the end of the side plate. Is brazed and has a socket connection circular hole at the end that communicates with the communication long hole.The horizontal part of the heat exchanger mounting bracket is the middle part of the length between the outer surface of the spacer and the left and right steps on the side plate. One of the sockets for connecting the fluid introduction or discharge pipe, which is brazed over at least a part of the outer surface of the bracket and has an internal thread portion at the end of the horizontal portion of the bracket for mounting the heat exchanger. Part is one that is joined in a state of being fitted into the circular hole for the socket connection.

According to the present invention, it is possible to obtain a laminated heat exchanger which solves the above problems all at once.

That is, in the laminated heat exchanger of the present invention,
The heat capacity of the spacer and bracket for mounting the heat exchanger is
This is much smaller than the heat capacity of the block-shaped socket in the prior art, so it is less likely to cause defective joints even when performing collective brazing together with the side plates and intermediate plates that make up the heat exchanger body. It saves the trouble of reworking and leads to cost reduction.

Further, since the socket is joined to the bracket for mounting the heat exchanger, the positional deviation between them is unlikely to occur, and the collective brazing including the socket is easy.

Moreover, the socket can be a standard product, the spacer can be easily manufactured by press working, and the bracket can be used as an adapter to suppress an increase in the number of parts. The processing cost is low, and the cost can be significantly reduced compared to conventional products.

Incidentally, the socket may be joined later by argon welding or the like in order to prevent the strength of the female screw portion from being lowered due to annealing during collective brazing.

Further, in the above-mentioned laminated heat exchanger, the side plate reinforcing wall is formed between both edges of the communicating long hole of the spacer, and the wall is a plurality of side walls on the outer surface of the end portion of the side plate. Are preferably brazed between each of the fluid introduction or discharge holes.

A relatively large fluid pressure may be applied between each of the plurality of fluid introduction or discharge holes at the end portion of the side plate. Such a side plate reinforcing wall should be formed in the spacer. As a result, the pressure resistance of the side plate portion can be increased, and there is no fear of damage due to fluid pressure.

[0015]

Next, embodiments of the present invention will be described with reference to the drawings. In the following description, "upper, lower, left, right" means the upper, lower, left, and right in FIG. 1 and FIG. 5, respectively.

1 to 4 show a first embodiment of the present invention, in which the illustrated laminated heat exchanger (1) is made of aluminum (including an aluminum alloy. The same applies hereinafter). It is a dual-purpose type consisting of an oil cooler part (1A) and an aftercooler part (1B).

This heat exchanger (1) is composed of a plurality of flat tube portions (2a) arranged in parallel in the upper and lower direction, and two header sections (2b) on the left and right in each of the front and rear pairs connected to each flat tube portion (2a). It has a heat exchanger body (2).

The heat exchanger body (2) is a recess for forming a fluid flow path.
(4) and a plurality of horizontal rectangular intermediate plates each having one pair of front and rear recesses (5) for forming the header, which are deeper than this and have fluid passage holes (6) in the bottom wall (5a), and two pairs on the left and right
(3) is a concave part for forming a fluid flow path between adjacent parts
(4) are opposed to each other and are joined in a state where they are vertically stacked so that the bottom wall (5a) of the header forming recess (5) is butted, and the intermediate plates located at both upper and lower ends
A horizontal rectangular side plate (7) is joined to the outside of (3). However, the header forming recess (5) of the adjacent intermediate plates (3) located about one third from the bottom of the heat exchanger body
For these, the bottom wall (5a) is not provided with a fluid passage hole (6), which separates the heat exchanger (1) into the oil cooler part (1A) and the aftercooler part (1B). , Oil cooler part (1A) flat pipe part (2a) and header part (2b)
The oil is made to flow into the flat pipe portion (2a) and the header portion (2b) of the aftercooler portion (1B), and the compressed air is caused to flow therethrough.

Adjacent flat tube portions (2a) of the heat exchanger body (2)
Corrugated fins (9) are respectively interposed between the intermediate plates (3) and the side plates (7) located between each other and at both upper and lower ends.

Steps (7a) are provided at the left and right ends of each side plate (7). And
Both ends (7c) outside the left and right steps (7a) of each side plate (7) are adjacent to these intermediate plates (3).
The front wall and the bottom wall (5a) of the pair of front and rear header forming recesses (5) are butted. Right edge of upper side plate (7)
In (7c), two oil introduction holes (8) leading to the two front and rear header parts (2b) on the right side of the intermediate plate (3) of the oil cooler part (1A) are opened, and the left end part (7c) ) Are two oil drain holes that communicate with the two front and rear header parts (2b) on the left side of the intermediate plate (3) of the oil cooler part (1A).
(8) is opened in parallel. At the right end (7c) of the lower side plate (7), there is an aftercooler part (1B).
Two front and right headers on the middle plate (3) of
Two compressed air introduction holes (8) leading to (2b) are opened,
At the left end (7c) of the same, two compressed air discharge holes (8) communicating with the two front and rear header parts (2b) on the left side of the intermediate plate (3) of the aftercooler part (1B) are opened in parallel. Has been.

On the outer surface of both ends (7c) of each side plate (7), there is a spacer (10) made of a vertical rectangular aluminum plate or the like having the same thickness as the step (7a) of the side plate (7). It is attached. In each spacer (10), a communication long hole (11) extending in the front and back is formed in the center of these spacers by press working, and the communication long hole (11) is formed in the side plate.
Two oil introduction or discharge holes (8) or two compressed air introduction or discharge holes formed at both ends (7c) of (7)
It is adapted to each of (8).

The lengthwise intermediate portion (7b) between the left and right side steps (7a) of each side plate (7) and the outer surface of each spacer (10) located on both the left and right sides of the length intermediate portion (7b) are straddled, The horizontal portion (12a) of the aluminum heat exchanger mounting bracket (12) having an L-shaped cross section is brazed.
The horizontal part (12a) of the bracket (12) is attached to the side plate (7).
It has the same width as that of the side plate (7) and is slightly longer than the side plate (7) .At both ends of the horizontal part (12a), a socket connection circular hole communicating with the communication elongated hole (11) of the spacer (10).
(13) has been opened. Vertical part (12b) of bracket (12)
An oval bolt insertion hole (14) is formed in both left and right ends and the center of the length. The bracket (1
Although 2) has an L-shaped cross section, other brackets having horizontal portions, such as a U-shaped cross section and an inverted T shape, can be applied to the present invention.

The upper heat exchanger mounting bracket
An oil introduction pipe connecting socket (15A) is joined to the right end of the horizontal portion (12b) of (12), and an oil discharge pipe connecting socket (15A) is joined to the left end (7c) of the horizontal portion (12b).
Similarly, the horizontal part of the lower heat exchanger mounting bracket (12)
Socket for compressed air introduction pipe connection at the right end of (12a)
The compressed air discharge pipe connection socket (15B) is joined to the left end (7c) of the same (15B).

Each of the sockets (15A, 15B) is made of a substantially cylindrical body made of aluminum, and an internal thread portion (16) is formed on the inner peripheral surface thereof. An annular step (17) is provided near the lower end or the upper end of the socket (15A, 15B), and the small diameter part (18) below the step (17) is a circular hole in the horizontal part (12a) of the bracket (12).
It is designed to fit into (13). The sockets (15A, 15B) are not limited to those shown in the figures, and it is of course possible to use standard products such as elbows.

Small diameter part (18) of these sockets (15A, 15B)
Is fitted into the socket connection circular hole (13) of the horizontal part (12a) of the bracket (12), and in this state, the socket (15A, 15B)
The step (18) is joined by brazing, argon welding, or the like to the peripheral portions of the circular hole (13) on the outer surfaces of both ends of the bracket horizontal portion (12a). A male screw portion at one end of a pipe for oil introduction or discharge or compressed air introduction or discharge is screwed into the female screw portion (16) of the socket (15A, 15B) (not shown).

Next, a method of manufacturing the laminated heat exchanger (1) will be described with reference to FIG.

First, the intermediate plate (3), the side plate (7), and the corrugated fins constituting the heat exchanger body (2)
Stack the spacers (9) as appropriate, and stack spacers (10) on the outer surface of both ends (7c) of the side plate (7) to remove the spacers (1
Place the horizontal part (12a) of the heat exchanger mounting bracket (12) on the outer surface of (0) and the outer surface of the middle part (7b) of the side plate (7) via the aluminum double-sided brazing sheet (19). In addition, through the ring-shaped aluminum double-sided brazing sheet (20) into the socket connection circular holes (13) at both ends of the horizontal part (12a) of the heat exchanger mounting bracket (12), insert each socket ( Fit the small diameter part (18) of 15A, 15B). And these parts (3,7,9,10,12,15A, 15B),
Perform vacuum brazing while fixing with a jig.

In this way, the laminated heat exchanger (1) shown in FIGS. 1 to 3 is obtained.

Regarding each socket (15A, 15B),
After joining parts other than these by collective brazing,
It may be joined to the horizontal portion (12a) of the bracket (12) by argon welding.

5 and 6 show a second embodiment of the present invention. The illustrated laminated heat exchanger (31) is used as, for example, a single oil cooler. Therefore, this laminated heat exchanger (31) has the following structural differences when compared with the laminated heat exchanger (1) shown in FIGS. Are the same and have substantially the same operational effects as the laminated heat exchanger (1).

That is, in the laminated heat exchanger (31) shown in FIGS. 5 and 6, the fluid passage hole (6) is formed in the bottom wall (5a) of the header forming recess (5) of all the intermediate plates (3). Has been opened.

Then, spacers (10) are brazed to the outer surfaces of both end portions (7c) of the lower side plate (7), and the outer surface of the intermediate length portion (7b) of the lower side plate (7) is brazed. And the horizontal portion (32a) of the heat exchanger mounting bracket (32) having an L-shaped cross section and having no socket connection circular hole at the end so as to straddle the outer surfaces of the spacers (10) located on both sides thereof. Is brazed.

Therefore, in the laminated heat exchanger (31), the right header portion (through the oil introduction pipe connecting socket (15A) disposed on the right end portion (7c) of the upper bracket (7) ( Oil is introduced into 2b), then the oil is guided to the left header part (2b) through the flat tube part (2a), and the oil is discharged to the left end part (7c) of the upper bracket (7). It is discharged from the socket (15A) for pipe connection.

7 and 8 show the above-mentioned laminated heat exchanger.
9 shows another embodiment of the spacer (10) at (1, 31). 7 and 8, the spacer (10X) is
Vertical side plate reinforcing walls (33) are provided between the central portions of the front and rear edges of the communication elongated hole (11). A relatively large fluid pressure may be applied between the two oil or compressed air introduction or discharge holes (8) at both ends (7c) of the side plate (7). Due to the presence of (33), the pressure resistance strength of both end portions (7c) of the side plate can be increased, and there is no fear of damage due to fluid pressure. Since the side plate reinforcing wall (33) can be formed at the same time when the spacer (10X) is formed by pressing, there is no problem such as cost increase.

FIG. 9 shows another means for solving the same problem as the side plate reinforcing wall (33) of the spacer (10X). In FIG. 9, the spacer (10) is not provided with a side plate reinforcing wall, but instead of this, two oil or compressed air introduction or discharge holes at both ends (7c) of the side plate (7) are provided. (8) Between the portions between each other and the portions between the two header forming recesses (5) at both ends of the intermediate plate (3) facing each other, the aluminum plate having a T-shaped cross section is used. The side plate reinforcing member (34) is interposed and brazed to each plate (7, 3). Even with such a side plate reinforcing member (34), the pressure resistance strength of both side plate end portions (7c) can be increased.

[0036]

According to the laminated heat exchanger of the present invention, the heat capacities of the spacer and the bracket for mounting the heat exchanger are significantly smaller than the heat capacities of the block-shaped sockets in the prior art. Even when the side plate and the intermediate plate, which form the main body, are collectively brazed, it is less likely that a joint failure will occur, which in turn saves labor for product rework and leads to cost reduction.

Further, since the socket is joined to the bracket for mounting the heat exchanger, the positional deviation is unlikely to occur between them, and the collective brazing including the socket is easy to perform.

Moreover, the socket can be a standard product, the spacer can be easily manufactured by press working, and the bracket can be used as an adapter to suppress an increase in the number of parts. The processing cost is low, and the cost can be significantly reduced compared to conventional products.

Further, a side plate reinforcing wall is formed between both edge portions of the communication elongated hole in the spacer, and the wall is formed with a plurality of fluid introduction or discharge holes on the outer surface of the end portion of the side plate. By brazing between them, the pressure resistance of the side plate portion can be increased, so that there is no fear of damage due to fluid pressure.

[Brief description of drawings]

FIG. 1 is a front view of a laminated heat exchanger showing a first embodiment of the present invention.

FIG. 2 is a partially enlarged perspective view showing a main part of a laminated heat exchanger.

FIG. 3 is a partially enlarged vertical cross-sectional view showing a main part of a laminated heat exchanger.

FIG. 4 is a partially enlarged exploded perspective view showing a main part of the laminated heat exchanger.

FIG. 5 is a front view of a laminated heat exchanger showing a second embodiment of the present invention.

FIG. 6 is a partially enlarged perspective view showing a main part of the laminated heat exchanger.

FIG. 7 is a perspective view of a spacer showing another embodiment of the laminated heat exchanger.

FIG. 8 is a partially enlarged vertical cross-sectional view showing a main part of another embodiment of the laminated heat exchanger.

FIG. 9 is a partially enlarged vertical cross-sectional view showing a main part of another embodiment of the laminated heat exchanger.

[Explanation of symbols]

 (1,31)… Multilayer heat exchanger (2b)… Header part (7)… Side plate (7a)… Step (7b)… Length intermediate part (7c)… End part (8)… Fluid introduction or discharge Holes (10,10X)… Spacer (11)… Slots for communication (33)… Side plate reinforcing wall (12)… Bracket for mounting heat exchanger (12a)… Horizontal part (13)… Circular hole for socket connection (15A, 15B) ... Socket for fluid introduction or discharge pipe connection (16) ... Female thread

Claims (2)

[Claims] 1. A header part (2b) is connected to an end (7c) of a side plate (7) having a step (7a) near both left and right ends.
In a laminated heat exchanger in which one or more holes for introducing or discharging fluid (8) are formed in parallel, in the outer surface of the end portion (7c) of the side plate (7), a step of the side plate (7) is formed. A spacer (10) made of a plate having the same thickness as (7a) and having a communication elongated hole (11) communicating with all the fluid introduction or discharge holes (8) is brazed, and the communication elongated hole is formed. The horizontal part (12a) of the heat exchanger mounting bracket (12) having the socket connection circular hole (13) leading to (11) at the end
Are brazed across the outer surface of the spacer (10) and at least part of the outer surface of the intermediate portion (7b) between the left and right steps (7a) of the side plate (7), and the heat exchanger mounting At the end of the horizontal part (12a) of the bracket (12), one end of the socket (15A, 15B) for connecting the fluid introduction or discharge pipe that has the female thread (16) is inserted into the socket connection circular hole (13). A laminated heat exchanger that is joined in a fitted state. 2. A side plate reinforcing wall (33) is formed between both edges of the communication elongated hole (11) of the spacer (10X),
The laminated type according to claim 1, wherein the wall (33) is brazed between the plurality of fluid introduction or discharge holes (8) on the outer surface of the end portion (7c) of the side plate (7). Heat exchanger.