JPH06159970A - Laminate type heat exchanger - Google Patents

Abstract

PURPOSE:To improve heat exchanging efficiency by a method wherein in a fluid flow passage formed of a pair of middle plates which are laminated with respective recess parts opposed and jointed with each other, fluid flowing into upper and lower headers is branched or joined so as to stir a fluidstream. CONSTITUTION:A number of substantially rectangular middle plates 6 are laminated and jointed with recess parts 7, 8 and 9 of the adjacent plates 6 opposed to each other, so that flat pipe parts 4 arranged in parallel and an upper header part 2 and a lower header part and 3 connected to the respective flat pipe parts 4 are formed. Fluid introduced from a fluid introducing inlet 11 flows in zigzag through all of the flat pipes parts 4 and the upper and the lower header parts 2 and 3, and is discharged out of a fluid outlet 12. At this time, in the fluid flow passage formed of a pair of middle plates 6 which are laminated with respective recess parts opposed and jointed with each other, the fluid flowing into the upper and the lower header parts is branched or joined so as to stir a fluidstream.

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 for a car / air conditioner evaporator or the like.

In this specification, upper and lower and left and right refer to the upper and lower and left and right in FIG.

[0003]

2. Description of the Related Art Conventionally, a laminated heat exchanger has a recess for forming a fluid flow path and recesses for forming both upper and lower header portions that are deeper than the recess, and is formed on the bottom wall of the recess for forming both upper and lower header portions. A large number of substantially rectangular plates each having a fluid passage hole are overlapped and joined to each other with their concave portions facing each other, so that parallel flat tubes and each flat tube are joined. Upper and lower header parts connected to each other are formed, one of the fluid inlet port and the fluid outlet port is provided at the left end of the upper header part or the lower header part, and the other is provided at the right end of the upper header part or the lower header part. The fluid passage hole of the bottom wall of either one of the upper and lower header portion forming recesses is closed at a required position of both the upper and lower header portions, and the fluid introduced from the fluid introduction port is filled in all flat pipe portions and What is adapted to be discharged from the fluid discharge port flows under the two header portion in a meandering shape is known.

[0004]

In the above conventional laminated heat exchanger, since the upper and lower header portion forming recesses are the same in number, the pair of recesses facing each other are superposed and joined together. In the fluid flow path formed by the intermediate plate, the flow of the fluid flowing into the upper and lower header portions is linear, and there is a problem that sufficient heat exchange efficiency cannot be obtained.

An object of the present invention is to provide a laminated heat exchanger with improved heat exchange efficiency.

[0006]

A laminated heat exchanger according to the present invention comprises a recess for forming a fluid flow path and a recess for forming an upper header portion and a recess for forming a lower header portion which are deeper than the recess and which are continuous with the upper and lower ends of the recess. Is formed so that the number of upper header portion forming recesses and the number of lower header portion forming recesses are different, and fluid passage holes are opened in the bottom walls of both upper and lower header portion forming recesses, A large number of the substantially rectangular plates are stacked and joined to each other such that adjacent ones have concave portions facing each other, so that the parallel flat pipe portions and the upper and lower header portions continuous with the flat pipe portions are formed. One of the fluid inlet and the fluid outlet is provided at the left end of the upper header section or the lower header section, and the other is provided at the right end of the upper header section or the lower header section. In place There any fluid passing hole of one of the bottom wall of the upper and lower header forming recessed portion is one that is closed.

[0007]

In the laminated heat exchanger according to the present invention, the fluid passage forming concave portion and the upper header portion forming concave portion and the lower header portion forming concave portion that are deeper than the fluid passage forming concave portion and continuous with the upper and lower ends of the fluid passage forming concave portion are formed by the upper header portion. The number of the forming recesses is different from the number of the lower header forming recesses, and fluid passage holes are formed in the bottom walls of both the upper and lower header forming recesses. A large number of adjacent pipes are overlapped with each other so that the concave portions face each other and are joined together, thereby forming parallel flat pipe portions and upper and lower header portions connected to the flat pipe portions. And one of the fluid discharge ports is provided at the left end of the upper header part or the lower header part, and the other is provided at the right end of the upper header part or the lower header part. Since the fluid passage hole in the bottom wall of either one of the application recesses is closed, the fluid introduced from the fluid inlet is meandered in all flat tubes and both upper and lower header sections. It flows and is discharged from the fluid discharge port. At this time, in the fluid flow path formed by the pair of intermediate plates that are overlapped and joined to each other with the concave portions facing each other, the fluid flowing into the upper and lower header portions is branched or merged to form a fluid. Is disturbed.

[0008]

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

The laminated heat exchanger shown in FIGS. 1 to 4.
(1) is a large number of intermediate plates made of aluminum (including aluminum alloy) and stacked in layers
(6) and side plates (16) that are superposed on the left and right ends of the superposing direction.

As shown in detail in FIG. 2, the intermediate plate (6) has a pipe cutout (2) at two corners of the upper end of the substantially rectangular plate so that a substantially semicircular portion is left at the center of the upper end of the plate. 1
5), the intermediate plate (6) is provided with a fluid channel forming recess (7) and an upper header portion that is deeper than the fluid channel forming recess (7) and continues to the upper end thereof. Recess (8)
And a lower header portion forming recess (9) which is deeper than the fluid passage forming recess (7) and is continuous with the lower end thereof.
One upper header portion forming recess (8) is provided in a substantially semi-circular portion at the center of the upper end of the plate, and two lower header portion forming recesses (9) are provided in front and behind the plate lower end. The fluid flow path forming recess (7) has a vertical rib (17) for forming a fluid flow path dividing part extending from between the two lower header forming recesses (9) to near the upper header forming recess (8). Is provided. Fluid passage holes (10) are formed in the bottom walls of the upper header portion forming recess (8) and the lower header portion forming recess (9), respectively.

A large number of the intermediate plates (6) are stacked and joined to each other so that the recesses (7), (8) and (9) are opposed to each other so that they are parallel to each other. Upper and lower header portions (2) and (3) connected to the pipe portion (4) and each flat pipe portion (4) are formed. Corrugated fins (5) are interposed between the flat tubes (4) adjacent to each other. A fluid introduction port (11) opening forward is provided at the center of the left end of the upper header part (2), and a fluid discharge port (12) opening rightward is provided at the center of the right end of the lower header part (3).

At a position about 1/3 from the left end of the upper header portion (2), the fluid passage hole (10) in the bottom wall of the upper header portion forming recess (8) is closed without being opened. A recess for forming the lower header portion at a position about 2/3 from the left end of the header portion (3)
The fluid passage hole (10) on the bottom wall of (9) is not opened and is closed. Then, as shown in FIG. 3, the fluid introduced from the fluid introduction port (11) flows in a meandering manner in all the flat tube portions (4) and both the upper and lower header portions (2) and (3) to drain the fluid. It is discharged from the outlet (12).

The intermediate plates (6) are recessed (7) (8) with respect to each other.
The vertical ribs (17) for forming the fluid flow path dividing portions are butted against each other when they are superposed in a state in which (9) face each other, and in each pair of intermediate plates (6), as shown in FIG. , The fluids are branched when flowing from top to bottom, and the fluids are merged when flowing from bottom to top.
By repeating this branching / merging, the heat exchange efficiency can be improved.

A fluid introduction pipe (13) is provided at the fluid introduction port (11).
However, a fluid discharge pipe (14) is connected to the fluid discharge port (12). The fluid discharge pipe (14) is provided so as to extend to the right of the fluid discharge port (12) opened to the right, and the fluid introduction pipe (13) is located slightly in front of the fluid introduction port (11) opened to the front. After being stretched, it is bent 90 degrees, passed through the pipe cutouts (15) of each intermediate plate (6), and extends to the same right side as the fluid discharge port (12). Therefore, when using this laminated heat exchanger (1) as an evaporator for a car air conditioner, for example, in order to avoid interference with other cooling units, the fluid introduction pipe (13) and the fluid discharge pipe (14) are installed. In some cases, it may be necessary to connect pipes extending in the same direction from either the left or right ends of the upper header section (2) or the lower header section (3). Even in this case, the pipe does not protrude from the core of the heat exchanger, and the space for installing the heat exchanger can be reduced.

Although not shown, each intermediate plate (6) is provided with a number of inclined ribs for increasing the heat transfer area in addition to the vertical ribs (17). The rib may be horizontal, vertical, or circular.

In the above embodiment, each intermediate plate
(6) is provided with notches (15) for piping at the two corners of the upper end, and the recesses for forming the upper header portion provided with the notches (15).
There are one (8) and two lower header section forming recesses (9) without cutouts (15), but the pipe cutouts are located in the front or rear of the upper or lower end of each intermediate plate. It may be provided on either one of them, and the numbers of the upper header portion forming recesses (8) and the lower header portion forming recesses (9) can be variously changed. For example, a pipe cutout may be provided at one corner of the lower end of the intermediate plate, the number of lower header portion forming recesses may be two, and the number of upper header portion forming recesses may be three. .

[0017]

According to the laminated heat exchanger of the present invention, the upper and lower header portions are provided in the fluid passage formed by the pair of intermediate plates which are superposed and joined to each other with the concave portions facing each other. Since the inflowing fluid is branched or merged to disturb the fluid flow, heat exchange efficiency is improved.

[Brief description of drawings]

FIG. 1 is a front view showing a laminated heat exchanger according to the present invention.

FIG. 2 is a perspective view of an intermediate plate.

FIG. 3 is a perspective view in which a part of the laminated heat exchanger of FIG. 1 is omitted.

FIG. 4 is a vertical sectional view of FIG.

[Explanation of symbols]

 (2) Upper header part (3) Lower header part (4) Flat tube part (6) Intermediate plate (7) Fluid channel forming recess (8) Upper header forming recess (9) Lower header forming recess (10) Fluid passage hole (11) Fluid inlet port (12) Fluid outlet port

Claims (1)

[Claims] 1. A recess (7) for forming a fluid flow path and a recess (8) for forming an upper header portion and a lower header portion which are deeper than the recess (7) and are connected to the upper and lower ends of the recess (7), respectively, in a substantially rectangular plate (6). The recesses (9) for forming are formed such that the number of the recesses (8) for forming the upper header portion and the number of recesses (9) for forming the lower header portion are different from each other, and the recesses (8) for forming the upper and lower header portions (8) ( A fluid passage hole (10) is formed in each bottom wall of (9), and a large number of substantially rectangular plates (6) are provided, and recesses (7) (8) are formed between adjacent plates.
The flat tubes (4) and the flat tubes (4) are arranged in parallel by stacking and joining them so that they face each other.
Both upper and lower header parts (2) and (3) that are connected to
Either (11) or fluid outlet (12) is the upper header
(2) or on the left end of the lower header part (3), and the other on the right end of the upper header part (2) or the lower header part (3). A laminated heat exchanger in which a fluid passage hole (10) in a bottom wall of one of the upper and lower header portion forming recesses (8) and (9) is closed at a location.