JPH0587486A - Laminated type heat exchanger - Google Patents

Abstract

(57) [Abstract] [Purpose] Repeated pressure resistance test allows the concentrated stress in the upper half of the header forming recess to be almost evenly distributed, thus preventing fatigue fracture in that part. It is possible to provide a laminated heat exchanger having increased pressure resistance. [Structure] Adjacent header forming recesses (4) at the end of each plate (2) that constitutes the laminated heat exchanger
(4) and plate (2) in the middle part (2a) of the three of the ends,
There is a through hole (9) with a substantially triangular shape when viewed from the front,
The distance (A) between the arcuate portion (4a) of each of the oval header forming recesses (4) and the side edge of the plate (2) on the same side,
The distance (B) between the other arcuate portion (4b) of the recess (4) and one side (9a) of the substantially triangular through hole (9) on the same side, and above the recess (4) Alternatively, the space (C) between the lower edge and the end of the plate (2) is made substantially equal.

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 an evaporator for a car / air conditioner.

[0002]

2. Description of the Related Art Conventionally, there are two types of laminated heat exchangers of this type: a type in which a header portion is provided on one of the upper and lower sides, or a type in which both of them are provided.

For example, as shown in FIG. 6, a laminated evaporator having a header portion at the top has a concave portion (23) for forming a refrigerant flow path on one surface and two header formations arranged so as to be continuous with at least one end thereof. A substantially rectangular plate (22) having a recess (24) for use is laminated and joined in a layered manner with the recesses (23) (24) facing each other so that they are adjacent to each other. As can be seen by referring to, the parallel flat tubes (25) and the header section (2
6) and are formed, all flat tubes (25) and header
The refrigerant in (26) flowed in a meandering shape as a whole.

[0004]

In such a conventional laminated evaporator (21), mainly in the vicinity of the header portion (26),
In particular, the upper half of the oval header forming recess (24) (the area indicated by the broken line in FIG. 6) is where stress is concentrated due to the shape of the heat exchanger, and fatigue breakdown occurs due to repeated withstand pressure tests. As a result, the pressure resistance is deteriorated. On the other hand, if the plate is made thicker, the material cost becomes higher and the cost becomes higher.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to perform repeated withstand voltage tests to improve the withstand pressure performance without causing fatigue damage in the vicinity of the header portion, particularly in the upper half of the oval header forming recess. Therefore, it is an object of the present invention to provide a laminated heat exchanger that can reduce the thickness of the plate, use less material, reduce the material cost, and reduce the manufacturing cost.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises a recess for fluid passage formation on one surface and a plurality of recesses for header formation arranged so as to be continuous with at least one end thereof. The substantially rectangular plates that are adjacent to each other are stacked and joined in a layered manner with the recesses facing each other, so that the parallel flat tubes and the header section that is continuous with at least one end of each flat tube section Is a laminated heat exchanger in which fluid flows in all flat tubes and headers in a meandering manner as a whole, wherein the header forming recesses are long in the left-right direction when viewed from the front. It has an oval shape and is arranged in a row in the left and right at the end portion of each plate, and in the end portion of each plate, there are three parts: the header forming concave portion and the plate end portion which are adjacent to each other. In the middle part, a through hole having a substantially triangular shape is formed as viewed from the front having two sides that are substantially parallel to the arcuate portions on the same side of both header forming recesses and one side that is substantially parallel to the plate end, The distance between one arcuate portion of each oval header forming recess and the side edge of the plate on the same side, the other arcuate portion of the recess and the substantially triangular through-hole on the same side The gist of the laminated heat exchanger is such that the distance between the one side and the distance between the upper or lower edge of the recess and the end of the plate are substantially equal.

[0007]

According to the laminated heat exchanger described above, in the portion near each end of each plate, an oblong header forming concave portion and an intermediate portion of the three plate end portions which are adjacent to each other penetrate a substantially triangular shape when viewed from the front. Since holes were made to make the interval between the upper half of each oval header forming recess and the side edge of the plate or the through hole substantially constant, the upper half of the header forming recess was subjected to repeated pressure resistance test. The concentrated stress can be dispersed almost uniformly, and therefore, fatigue failure can be prevented from occurring in the portion, and the pressure resistance performance can be increased.

[0008]

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

In this specification, front and rear, left and right are based on FIG. 1, the front means the front side of the drawing sheet of FIG. 1, the rear means the back side, and the left means the left side and the right side of the drawing. Same as the right side.

1 to 3 showing a first embodiment of the present invention, a laminated evaporator (1) for a car air conditioner is shown.
Is made of aluminum (including an aluminum alloy), and has a recess (3) for forming a refrigerant flow channel on one surface and two recesses (4) for forming a header that are connected to the lower end of the recess and are arranged in a row on the left and right. Substantially rectangular plates (2) having and are stacked in layers with the recesses (3) and (4) facing each other so that the flat tubes (5) and the parallel flat tubes (5) are The flat tube portion (5) is formed with a header portion (6) connected to the upper end of the flat tube portion (5). Corrugated fins (12) are interposed between the flat tubes (5) adjacent to each other.

In this embodiment, in the central portion of the concave portion (3) for forming the refrigerant flow passage of each plate (2), a partition convex portion (7) long in the vertical direction is formed at the lower end than the upper end of the concave portion (3). The right and left header-forming recesses (4) (4) are provided up to a portion near them, and substantially oblong refrigerant passage holes (8) (8) that are long in the left and right are formed in the bottom walls of the recesses (4) (4).

Each plate of the evaporator (1)
In the part near the upper end of (2), the header forming recesses (4) and (4) adjacent to each other and the intermediate part (2
a), both header forming recesses (4) (4) arcuate part (4a) on the same side of (4)
Two sides (9a) and (9b) that are approximately parallel to (4b) and the plate (2)
There is a through hole (9) that has a substantially triangular shape when viewed from the front and has one side (9c) that is substantially parallel to the end, and one circular arc portion (4a) of each oval header forming recess (4) is formed. The distance (A) between this and the side edge of the plate (2) on the same side, the other arcuate portion (4b) of the recess (4) and the through-hole (9) on the same side as this. The space (B) between the side (9a) and the space between the upper edge of the recess (4) and the end of the plate (2) (C) is substantially equal.

Side plates (13) and (13) are arranged on both front and rear outer sides of the evaporator (1), and corrugated fins () are provided between each side plate (13) and the flat tube portion (5). 12) is interposed.

Evaporator (1) Refrigerant introduction pipe (1
The refrigerant introduced into the header section (6) on the same side of 4) flows into the inside of the flat tube section (5) from this, but on the right and left sides of the plate (2) at the required locations of the header section (6). Since the refrigerant passage hole is not formed in the bottom wall of one of the header-forming recesses (4) and is closed (not shown), the refrigerant is in each flat pipe section.
A coolant passage hole (8) that flows in a U shape inside (5) and is further formed in the bottom wall of the other header forming recess (4) at the same location.
To the subsequent header part (6), and finally, the product flows in a meandering shape as a whole inside the evaporator (1) and is discharged from the last header part (6) to the refrigerant discharge pipe (15). It is done like this.

On the other hand, the wind is allowed to flow in the left-right direction through the gap where the corrugated fins (12) exist between the flat tube portions (5) of the evaporator (1).

In the above description, in the portion near the upper end of each plate of the evaporator (1), the oblong header forming recesses (4) (4) and the intermediate portion (2a) of the three ends of the plate (2) are adjacent. ) Through a through-hole (9) that is roughly triangular when viewed from the front, and between the upper half of each oval header forming recess (4) and the side edge of the plate (2) or through-hole (9). Interval (A) (B)
Since (C) is made almost constant, the concentrated stress in the upper half of the header forming recess (4) can be almost evenly distributed by repeated withstand voltage test, and therefore fatigue fracture occurs in that part. Can be prevented in advance, and the pressure resistance performance can be increased.

4 and 5 show a second embodiment of the present invention. Here, the point different from the case of the first embodiment is that the header portions (6) and (6) are provided at both upper and lower end portions of the evaporator (1).
Along with this, at the upper and lower end portions of each plate (2), through holes (9) (9) having a substantially triangular shape when viewed from the front are formed in the intermediate portions (2a) (2a) of the plate (2). It is in the open point.

That is, the plate (2) constituting the evaporator (1) is provided with a concave portion (3) for forming a refrigerant flow passage and header forming concave portions (4) (4) connected to both upper and lower ends thereof. The bottom wall of each header forming recess (4) has a substantially oval-shaped refrigerant passage hole (8) that is long in the left and right. Then, at the upper and lower end portions of each plate (2), the header forming recesses (4) and (4) are adjacent to each other, and the header forming recesses are formed in the intermediate portion (2a) of the three ends of the plate (2). (4) Two sides (9a) and (9b) substantially parallel to the arcuate portions (4a) and (4b) on the same side of (4) and one side (9c) substantially parallel to the end of the plate (2) are provided. It has a through-hole (9) that is roughly triangular when viewed from the front, and has one arcuate part (4a) of each oval header forming recess (4) and the side edge of the plate (2) on the same side. Distance between parts (A), same recess (4)
The other arcuate part (4b) of this and the through hole of the substantially triangular shape on the same side as this
(9) Space between one side (9a) (B) and space between the upper or lower edge of the recess (4) and the edge of the plate (2) (C)
However, they are almost equal.

It should be noted that at the required locations of the upper and lower header portions (6) and (6), the bottom wall of either the upper or lower header forming recess (4) is a partition wall portion having no refrigerant passage hole ( (Not shown), evaporator (1) Refrigerant introduction pipe (1
4) The refrigerant introduced into the header section (6) on the same side flows as a whole in a meandering shape inside the evaporator (1), and is discharged from the last header section (6) to the refrigerant discharge pipe (15). It is designed to be.

The other points of the second embodiment are the same as those of the first embodiment.
Since it is the same as the case of the embodiment, the same components are denoted by the same reference numerals in the drawings.

In the above embodiment, the header forming recess (4) connected to the upper end of the refrigerant flow path forming recess (3) has two left and right sides.
However, it goes without saying that three or more of them are arranged in a row on the left and right. Even in that case, each plate (2)
At the upper and lower end portions of the upper side of the header forming recesses (4) (4) and the end of the plate (2) which are adjacent to each other, the middle portion (3
a), both header forming recesses (4) (4) arcuate part (4a) on the same side of (4)
Two sides (9a) and (9b) that are approximately parallel to (4b) and the plate (2)
A through-hole (9), which has a substantially triangular shape when viewed from the front and has one side (9c) substantially parallel to the end, is formed, and each oval header forming recess is formed.
(4) The above intervals (A), (B) and (C) in the upper half part are made substantially equal.

The laminated heat exchanger according to the present invention can be applied not only to a heat exchanger for automobiles, particularly an evaporator, but also to other heat exchangers of the same kind for oil coolers, aftercoolers, radiators and the like. is there.

[0023]

As described above, according to the present invention, a substantially rectangular plate having a recess for forming a fluid flow path and a plurality of recesses for forming a header, which are arranged so as to be continuous with at least one end of the recess, is provided adjacent to one surface. By matching and stacking them in layers with the recesses facing each other,
A laminated heat exchange system in which parallel flat tubes and a header section that is connected to at least one end of each flat tube section are formed, and fluid flows in all flat tubes and header sections in a meandering manner as a whole. In the container, the header forming recess has an oval shape that is long in the left-right direction when viewed from the front,
The plates are arranged in a row on the left and right sides of each plate near the ends. At the end of each plate, the header forming recesses and the plate ends are formed in the middle of the three headers. A substantially triangular through hole is formed when viewed from the front, having two sides that are substantially parallel to the arcuate portion on the same side of the recess and one side that is substantially parallel to the end of the plate. A distance between one arcuate portion and a side edge portion of the plate on the same side, a distance between the other arcuate portion of the recess and one side of a substantially triangular through hole on the same side, and Since the distance between the upper or lower edge of the recess and the plate end is approximately equal, repeated pressure resistance tests show that the distance near the header, especially in the upper half of the oval header forming recess, is high. Without causing fatigue failure
It is possible to increase the pressure resistance performance, which makes it possible to reduce the thickness of the plate, the amount of material used is small, the material cost is low, and the manufacturing cost of the heat exchanger can be reduced. ..

[Brief description of drawings]

FIG. 1 is a front view of a plate of a laminated evaporator showing a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a header portion of the same laminated evaporator.

FIG. 3 is a side view of the entire laminated evaporator.

FIG. 4 is a front view of a plate of a laminated evaporator showing a second embodiment of the present invention.

FIG. 5 is an enlarged cross-sectional view of a header portion of the same laminated evaporator.

FIG. 6 is a front view of a plate of a laminated evaporator showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Multilayer evaporator (multilayer heat exchanger) 2 Plate 3 Refrigerant flow path forming recess (fluid flow path forming recess) 4 Header forming recess 4a Left arc-shaped section 4b Right arc-shaped section 5 Flat tube section 6 Header section 9 Through-holes that are substantially triangular when viewed from the front 9a Sides of through-holes that are substantially parallel to one arc-shaped portion of the header-forming recess 9b Sides of through-holes that are substantially parallel to the other arc-shaped portion of the header-forming recess 9c Plate edge One side of the through hole substantially parallel to the portion A Distance between the arcuate portion of the recess and the plate side edge B Distance between the arcuate portion of the recess and one side of the substantially triangular through hole C Above or below the recess Distance between edge and plate edge

Claims (1)

[Claims] 1. A substantially rectangular plate (2) having, on one side, a recess (3) for forming a fluid flow path and a plurality of recesses (4) for forming a header arranged so as to be continuous with at least one end of the recess (3) are adjacent to each other. Matching pieces Composed of the flat tubes (5) in parallel and at least one end of each flat tube (5) by stacking and joining them with the recesses (3) (4) facing each other. Is a laminated heat exchanger in which a header section (6) connected to the flat tube section (6) is formed, and the fluid flows in a meandering shape as a whole in all the flat tube sections (5) and the header section (6). , The header forming recess (4) has an oval shape that is long in the left-right direction when viewed from the front, and is arranged in a row on the left and right sides near the ends of each plate (2). In the part close to the end of 2), in the middle part (2a) of the three parts of the recesses (4) (4) and the plate (2) adjacent to each other for forming the header. Two sides (9a) and (9b) that are substantially parallel to the arcuate portions (4a) and (4b) on the same side of both header forming recesses (4) and (4) and one side that is substantially parallel to the end of the plate (2). (9c) has a through-hole (9) of a substantially triangular shape when viewed from the front, and one arcuate part (4a) of each oval header forming concave part (4) and the plate on the same side (4a) The distance (A) between the side edge of (2) and the other arcuate portion (4b) of the recess (4) and one side (9a) of the substantially triangular through hole (9) on the same side. Stacked heat exchangers, in which the distance (B) between them and the distance (C) between the upper or lower edge of the recess (4) and the edge of the plate (2) are substantially equal. ..