JP3000188B2 - Stacked heat exchanger - Google Patents

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, this type of laminated evaporator has
A substantially rectangular plate having a concave portion for forming a coolant flow path and a concave portion for forming a header connected to an end of the concave portion on one side is layered and joined in a state where the concave portions are opposed to each other. As a result, a parallel flat tube portion and a header portion connected to the end of each flat tube portion are formed.

The plate is provided with projections (ribs) for mixing and rectifying the refrigerant after the flat tube portion is formed.
In order to improve the performance of heat exchange, ribs are provided on each plate even in a so-called single-tank type laminated evaporator having a header portion on one side of the upper and lower sides of the laminated plate.

[0004]

However, in the conventional single-tank type laminated evaporator, cross ribs, circular protruding ribs or ribs having a relatively short length are arranged obliquely to the flow direction of the refrigerant. It was just. These ribs are provided for the purpose of mixing the refrigerant, but at the same time, increase the pressure loss of the refrigerant, thereby hindering the performance improvement.

[0005] In particular, as a current trend, a small and thin laminated evaporator has been demanded. In a thin laminated evaporator, it is difficult to eliminate temperature unevenness in the thickness direction by mixing a refrigerant by cross ribs. , Is no longer a good idea.

In addition, in the single-tank type laminated evaporator, the refrigerant flow is liable to stagnate or drift due to the flow of the refrigerant before and after the folded flow passage portion of the substantially U-shaped flat tube portion when viewed from the front, which is a cause of performance deterioration. Was.

Further, in the conventional evaporator, there is a problem that it is difficult to secure the pressure resistance since the joint between the plates is joined by point contact.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to improve the performance by improving the rib shape of the heat exchanger constituting plate and, consequently, the structure of the fluid flow path of the flat tube portion. It is an object of the present invention to provide a laminated heat exchanger that can improve the pressure resistance, can easily form a plate, and can reduce the manufacturing cost.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a U-shaped fluid passage forming recess formed on one side of a substantially rectangular plate and an end thereof connected to a U-shaped fluid passage forming recess as viewed from the front. Two header forming recesses are provided, and a vertically long partition portion is provided at the center of the fluid flow path forming recess from the upper end of the recess to a portion closer to the lower end, and the partition portion has a depth substantially equal to the depth of the recess. have the same height, are superposed in layers in a state where adjacent plates together <br/> is made to face the concave portion to each other, the partition portions facing the plates, and the peripheral portion
When they are joined to each other, a number of U-shaped flat tube portions as viewed from the front and header portions connected to the ends of the flat tube portions are formed, and a fluid passage hole is formed in the bottom wall of each header forming recess. In the stacked heat exchanger in which the fluid flows through all the flat tube portions and the header portion, the U-shaped fluid flow path forming concave portions of each plate are provided with concave portions on both right and left sides. Rectifying ridges having a height approximately twice as large as the depth of the U-shaped flat tube and having a rectifying ridge having a height approximately twice the depth of the U-shaped flat tube after the adjacent plates are superimposed. A large number of small projections for forming a fluid mixing section and a long projection for forming a rectifying section are provided at a folded portion of the U-shaped fluid flow path forming recess at a height approximately twice the depth of the recess. Of the U-shaped flat tube section so that Provided at positions which are symmetrical as a whole passage section returns, left corner of the folded subordinate unit
From the front, which is almost twice as high as the depth of the recess
Substantially triangular reinforcing projections are provided , and adjacent plates are layered on top of each other with their recesses facing each other. The leading end of the rectifying ridge that is long in the direction is joined to the bottom wall of the straight flow path forming portion of the opposing plate, and a number of small protrusions , long protrusions , and reinforcing protrusions are formed at the folded portion of the U-shaped fluid flow path forming recess. each tip parts can be engaged against the bottom wall of the folded portion of the opposing plate, the turned-back channel portion of the U-shaped flat tube section, and the fluid mixing portion made of a large number of small projections,
A rectifying portion formed of a parallel long convex portion is formed,
The gist is a stacked heat exchanger.

In the above-mentioned laminated heat exchanger, a rectifying section is provided at the center of the folded flow path section of each U-shaped flat tube section, and a fluid mixing section is provided on both outer sides of the rectifying section. In some cases, a fluid mixing section is provided at the center of the folded flow path section, and rectification sections are provided on both outer sides of the fluid mixing section.

In the former case, of the long convex portions forming the rectifying portion at the central portion of the folded flow channel portion of each U-shaped flat tube portion, on the extension of the long partition portion at the central portion of the concave portion for forming the fluid flow channel. When there is a long convex portion located at a position, the long convex portion is made to have substantially the same height as the depth of the folded portion of the concave portion of each plate, and the adjacent plates face the concave portion to each other. In the folded state of the U-shaped fluid flow path forming concave portion, the tips of the long convex portions of the adjacent plates are joined to each other at the folded portion of the U-shaped fluid flow path forming concave portion.

In the latter case, among the small projections forming the fluid mixing portion at the center of the folded flow passage portion of each U-shaped flat tube portion, the small projection on the extension of the long partition at the center of the recess for forming the fluid flow passage. Is present, the small projections are formed to have substantially the same height as the depth of the folded portion of the concave portion of each plate, and the adjacent plates face the concave portion to each other. When the layers are superposed in layers, the tips of the small projections of the adjacent plates are joined to each other at the folded portion of the U-shaped fluid channel forming concave portion.

[0013]

In the above-mentioned laminated heat exchanger, a straight ridge is provided in both the right and left straight flow path forming portions of the U-shaped fluid flow path forming recess of each plate, so that the U-shaped flat heat exchanger is provided. The flow direction of the fluid in both the right and left straight flow path portions of the pipe becomes linear, and the pressure loss of the fluid does not increase. In each of the U-shaped flat tube sections, a fluid mixing section is provided at a central portion thereof and a rectifying section is provided on both outer sides of the fluid mixing section, or a rectifying section is provided at a central portion of the folded channel section. Is provided and the fluid mixing portions are provided on both outer sides of the rectifying portion, so that the rectifying action and the mixing action are simultaneously performed in the folded flow path portion of the U-shaped flat tube portion, and in the folded flow path portion, The fluid flow can be smooth, and the heat transfer coefficient can be improved. In addition, since there is no occurrence of a stagnant portion in the flow of the fluid in the return path portion immediately after the return flow path portion among the fluid flow paths of the flat pipe portions as in the related art, the return of the U-shaped flat pipe portion is not performed. There is no stagnation or drift in the flow of the fluid before and after the flow path portion, the pressure loss of the fluid can be kept small, and the performance can be improved.

Further, the tip of the vertically long rectifying ridge in the right and left straight flow path forming portion of the U-shaped concave portion of each plate is joined to the bottom wall of the straight flow path forming portion of the opposing plate. Since the tips of the many small projections and the tips of the long projections are joined to the bottom wall of the turned-up portion of the opposing plate at the turned-up portion of the recess, the joining area increases, and so-called point contact does not occur. Since they are joined by surface contact, the pressure resistance is increased.

Further, rectifying ridges which are long in the vertical direction are provided on the left and right straight flow path forming portions of the U-shaped fluid flow path forming recess of each plate, and the right and left sides of the U-shaped flat tube portion are formed after adjacent plates are overlapped. Provided at symmetrical positions in the straight flow path portion, and at the folded portion of the concave portion, a large number of small protrusions to form a fluid mixing portion and a long convex portion to form a rectifying portion are formed on adjacent plates. Since the folded channel portion of the U-shaped flat tube portion is provided at a position which is left-right symmetric after the superposition, the number of long straightening ridges, long projections and projections provided on each plate can be reduced, and Molding of each plate is easy.

[0016]

Next, an embodiment of the present invention will be described with reference to the drawings.

In this specification, left and right, front and rear, and up and down are based on FIG. 1, left is on the left side of FIG. 1, right is on the right side, and front is on the front side of the drawing sheet. The back means the back side, the upper side means the upper side in the figure, and the lower side means the lower side.

FIGS. 1 to 6 show an embodiment in which the present invention is applied to a laminated evaporator (1) for a car air conditioner.

[0019] Oite in the figure, the laminated type evaporator (1)
Is made of aluminum (including an aluminum alloy) and has a substantially rectangular plate (2) formed on one side with a U-shaped recess for forming a fluid flow path (3) as viewed from the front and connected to the left and right upper ends thereof. The header forming recesses (4) and (4) are provided, and a vertically long partition (9) is provided at the center of the fluid passage forming recess (3).
Are provided from the upper end of the recess (3) to the portion closer to the lower end, the partition (9) has a height substantially equal to the depth of the recess (3), and the adjacent plates (2) ( 2) recesses each other to each other
(3) (3) (4) (4) are superposed in layers in a state where they face each other , and opposing partitions (9) (9) of both plates (2) (2), and the same peripheral edge (19) By joining the (19) to each other, a U-shaped flat tube portion (5) and each flat tube portion (5) are viewed from the front.
And a pair of header portions (6) and (6) connected to the upper left and right upper ends. Flat tube portion adjacent (5) (5) opposite plates (2) (2) each other, these header forming recessed portions (4)
While the bottom wall (7) (7) of (4) abut each other ,
The protrusions (2) provided at the lower ends of both plates (2) and (2)
6) (26) to each other are joined respectively butted to each other, flat tube portion adjacent (5) (5) Colgate between each other
Fins (24) are interposed.

Side plates (20) and (20) are arranged on both front and rear outer sides of the evaporator (1), respectively, and the corrugated fins (5) are also provided between each side plate (20) and the flat tube portion (5). 24) is interposed. Both side plates (20) (20)
And the intermediate plates (2) are each made of aluminum brazing sheet.

Referring also to FIGS. 1, 2 and 3,
When viewed from the front of each plate (2), the right and left straight flow path components (3a) and (3b) of the U-shaped refrigerant flow path forming recess (3) have a height approximately twice as large as the depth of the recess (3). Rectifying ridge with a long length in the vertical direction
(15) and (16) are provided so as to be symmetrical in the left and right straight channel sections (5a) and (5b) of the U-shaped flat tube section (5) after the adjacent plates (2) and (2) are overlapped. Have been.

That is, in this embodiment, each plate
Two straightening ridges (15) are provided in the middle part on both sides of the central part of the left straight flow path forming part (3a) of the concave part (3) of (2), while the right straight flow path structure Three rectifying ridges (16) are provided on both the left and right sides and the center of the portion (3b).

Each plate (2) has the same shape,
When two adjacent plates (2) and (2) are overlapped with the recesses (3) and (3) facing each other, the left straight flow path forming part (3a) of one of the first plates (2) is used. ) Is opposed to the right-hand straight flow path component (3b) of the other second plate (2), and the right-hand straight flow path component (3b) of the first plate (2) is connected to the other second plate (3). 2), facing the left side straight flow path component (3a),
Each of the two straightening ridges (15) of the left straight flow path component (3a) of the first plate (2) and three of the right straight flow path component (3b) of the other second plate (2). Five straightening ridges (16) are alternately arranged, and at the same time, the first plate
Three rectifying ridges of the right-side straight channel forming portion of (2) (3b) (16 )
And the left side straight flow path component (3a) of the other second plate (2)
The two straightening ridges (15) are alternately arranged and a total of five are arranged. After the adjacent plates (2) and (2) are overlaid, the right and left straight flow path portions (2) of the U-shaped flat tube portion (5) 5a) and (5b) are symmetrical.

Then, when the adjacent plates (2) and (2) are superposed in layers with the recesses (3) (3) (4) and (4) facing each other , a U-shaped refrigerant The straight flow path of the plate (2) in which the ends of the rectifying ridges (15) and (16), which are long in the vertical direction, face each other in the left and right straight flow path components (3a) and (3b) of the flow path forming recess (3) It is joined to the bottom walls (17) (17) of the components (3a) (3b).

Referring also to FIG. 1, FIG. 2 and FIG.
A large number of small protrusions (1) on which a refrigerant mixing section (10) is to be formed are formed at the folded section (3c) of the U-shaped refrigerant flow path forming recess (3) of each plate (2).
2) and the long protruding portion (13) constituting the rectifying portion (11) are almost twice as high as the depth of the concave portion (3) except for those located at the center of the folded portion (3c). Plates that are adjacent to each other
(2) The folded flow path (5c) of the U-shaped flat tube (5) is provided so as to be symmetrical as a whole after the superposition of (2).

That is, in this embodiment, each plate
On the left side of the central part of the folded part (3c) of the concave part (3) for forming a U-shaped refrigerant flow path (2), one long convex part (13) inclined downward and to the right.
Is provided on the right side, and one long convex portion (13) inclined higher and lower to the left is provided on the right side, and three horizontal long convex portions (23) and one A small circular projection (22) is provided.

On the left side of the folded portion (3c), a refrigerant mixing portion is provided.
(10) Three small projections (12) to be formed are provided at predetermined intervals and in an oblique arrangement inclined upward to the left.
On the right side of (3c), two small projections (12) for forming the refrigerant mixing section (10) are provided at predetermined intervals and in an oblique arrangement inclined upward to the left, and one small projection (12) is provided. The small projections (12) are provided in a staggered arrangement.

Furthermore, the left-side corner portion which does not contribute too much heat exchange lower the turnup portion (3c) has a substantially triangular reinforcing projection (14) is provided as viewed from the front.

Here, one long downwardly inclined convex portion (13) on the left side of the center of the folded portion (3c), one downwardly inclined long convex portion (13) on the right side, and a folded back portion. The small projections (12) other than the center of the portion (3c) and the reinforcing projections (14) each have a height approximately twice the depth of the recess (3), and the folded portion (3
c) The three horizontal long protrusions (23) and one circular small protrusion (22) at the center are formed by the recesses (3) as well as the central partition (9) and the plate peripheral portion (19). It has the same height as the depth of (3).

Then, the adjacent first and second plates
(2) (2) is overlapped with the U-shaped refrigerant flow path forming recesses (3) (3) facing each other, one of the first plate (2)
One long convex portion (13) inclined to the lower right of the central portion of the folded portion (3c) of the concave portion (3) and the other second plate (2)
One long protruding part (13) inclined to the left of the center part of the folded part (3c) of the concave part (3) of the concave part (3). (Sloped) and staggered at different levels, recesses (3)
In the folded portion (3c) of the second plate (2), the distal ends of the long convex portions (13) are opposed to the bottom wall (1) of the folded portion (3c) of the second plate (2).
8) respectively.

The three small projections (12) on the left side of the folded portion (3c) of the concave portion (3) of the first plate (2) and the second plate (2)
The two small projections (12) (12) and the small projections (12) arranged in a staggered manner are arranged differently from each other. 1 plate
The folded portion (3c) of the second plate (2) corresponds to the folded portion (3c) of the second plate (2) against the substantially triangular reinforcing projection (14) at the lower left corner of the plate (2).
c) The substantially triangular reinforcing projection (14) at the lower left corner is
The second plate is opposite to the first plate (2)
(2) is located at the lower right corner of the folded portion (3c), and after the adjacent plates (2) and (2) are overlapped, the folded flow channel portion (5c) of the U-shaped flat tube portion (5) It is symmetrical.

Then, the adjacent plates (2) and (2) are layered on top of each other with the recesses (3) and (3) facing each other, and the recesses (3) of the first plate (2) are In the folded portion (3c), the small projections (12), the long protruding portions (13) (13), and the reinforcing protruding portions (14) of the inclined second protruding portion are opposed to each other by the second plate.
It is joined to the bottom wall (18) of the folded part (3c) of (2), and has three horizontal long projections (23) and one circular small projection (22) at the center of the folded part (3c). Are joined in a state where they abut against each other, and eventually, the folded flow path portion (5) of the U-shaped flat tube portion (5)
c) In the center, three long protrusions (23) and one small protrusion (2
2) and a rectifying portion (11) composed of these long sloping convex portions (13) and (13) on the left and right sides, and a refrigerant composed of a number of small protrusions (12) on the left and right sides of the rectifying portion (11). A mixing section (10) is formed.

As shown in FIGS. 2 and 5, the bottom walls (7) and (7) of the left and right two header forming recesses (4) and (4) have substantially oblong refrigerant passage holes that are long in the left and right directions. (8) and (8) are opened, and annular walls (25) and (25) projecting toward the inside of the header forming recess (4) are formed around the periphery of the refrigerant passage holes (8) and (8), respectively. Is provided.

In a required portion of the header portion (6) of the evaporator (1), a coolant passage hole is formed in the bottom wall (7) of one of the header forming recesses (4) on the left and right sides of the plate (2). Because it is not covered (not shown), the refrigerant flows inside each flat tube portion (5) in an inverted U shape, and at the same location, the bottom wall (4) of the other header forming recess (4) is formed. From the refrigerant passage hole (8) drilled in (7), it proceeds to the subsequent header part (6), and eventually flows in the evaporator (1) as a whole in a meandering shape.

In the above description, the evaporator (1) has a refrigerant inlet pipe (27) on the front side (see FIG. 6) and a header section (6) on the same side.
The refrigerant introduced into the flat tube portion flows into the flat tube portion (5). The refrigerant flows inside each flat tube portion (5) in an inverted U shape, and further flows through the refrigerant passage hole (8) formed in the bottom wall (7) of the other header forming recess (4), and then flows into the header. Proceed to section (6).

When the refrigerant flows through each U-shaped flat tube portion (5), the straight flow channel portions (5a) and (5b) on both left and right sides of each flat tube portion (5) have a rectifying ridge (long) extending in the vertical direction. Since the flow paths (15) and (16) are provided, the flow direction of the refrigerant in these flow path portions (5a) and (5b) becomes linear, and the pressure loss of the refrigerant does not increase. A rectifying section (11) is provided at the center of the folded flow path section (5c) of each U-shaped flat tube section (5).
Since the fluid mixing sections (10) and (10) are provided on both outer sides of (1), the rectifying action and the mixing action are simultaneously performed in the folded flow path section (5c) of the U-shaped flat tube section (5). , The folded channel section
The flow of the refrigerant in (5c) becomes smooth, and the heat transfer coefficient can be improved. The U-shaped flat tube section (5) has a folded flow path section (5
The performance can be further improved without causing stagnation or drift in the flow of the refrigerant before and after c).

Thus, the refrigerant is transferred to the header (6)
To the flat tube section (5) and the evaporator (1)
Flows in a meandering shape throughout the
The refrigerant is discharged from (6) to the refrigerant discharge pipe (28).

On the other hand, the presence of the evaporator flattened pipe portion adjacent the (1) (5) (5) corrugated fin between or between flat pipe section between the (5) side plate (20) (24) Air flows through the gap, and the wall of the plate (2)
The heat is efficiently exchanged between the refrigerant and the air via the fins (24).

Also, the ridges (15) of the left and right straight flow path components (3a) (3b) of the U-shaped refrigerant flow path recess (3) of each plate (2).
(16), and a long convex portion (13) of the folded portion (3c) of the concave portion (3)
And the small projections (12) each have a height approximately twice as large as the depth of the concave portion (3).
(2), the projections (15) (16), the long projections (13), and the small projections (12) have a large joint area. Thus, the pressure resistance of the heat exchanger (1) increases.

Also, the straight ridges (15) (15) (long in the vertical direction) are provided in the left and right straight channel forming portions (3a) (3b) of the U-shaped refrigerant channel forming recess (3) of each plate (2). 16) but adjacent plates (2)
After the superposition of (2), the U-shaped flat tube portion (5) is provided so as to be bilaterally symmetric in the left and right straight channel portions (5a) (5b),
And, in the folded portion (3c) of the concave portion (3), a number of small projections (12) to form the refrigerant mixing portion (10) and a long convex portion (13) to constitute the rectifying portion (11), Except for the one located at the center of the folded part (3c), the adjacent plates (2) and (2) are provided so that they are alternately located after being superimposed and are symmetrical as a whole. Long straightening ridges (1
5) (16) The number of long projections (13) and projections (12) can be reduced, and press forming of each plate (2) is easy.

Contrary to the case of the above embodiment , a refrigerant mixing section is provided at the center of the folded flow path section (5c) of each U-shaped flat tube section (5).
(10) may be provided, and rectification units (11) and (11) may be provided on both outer sides of the refrigerant mixing unit (10) .

Each plate (2) of the evaporator (1)
The shape of the long parallel convex portion (13) of the rectifying portion (11) provided in the folded portion (3c) of the U-shaped refrigerant flow path forming concave portion (3) is not limited to the illustrated one, but may be other shapes. May be provided.

The laminated heat exchanger according to the present invention has a
It can be used not only for cooler evaporators but also for other uses such as oil coolers, after coolers and radiators.

[0044]

According to the present invention, as described above, a U-shaped fluid flow path forming recess as viewed from the front and two header forming recesses connected to the ends thereof are provided on one side of a substantially rectangular plate. A vertically long partition portion is provided at a central portion of the fluid flow path forming concave portion from the upper end of the concave portion to a portion closer to the lower end, and the partition portion has substantially the same height as the depth of the concave portion. , plates adjacent to each other are superimposed in layers while being opposed to the concave portion to each other, by the partition portions facing the plates, and the peripheral edge portions are joined together, the U-shaped when viewed from the front A number of flat tube portions and a header portion connected to the end of each flat tube portion are formed, and a hole for fluid passage is formed in the bottom wall of each header forming recess, and fluid flows through all the flat tube portions and the inside of the header portion. For a stacked heat exchanger that is made to flow In each of the right and left straight flow path forming portions of the U-shaped fluid flow path forming recess of each plate, rectifying ridges having a height approximately twice the depth of the recess and being long in the vertical direction are adjacent to each other. After the plates are superimposed, the U-shaped flat tube is provided at a position which is symmetrical in the left and right straight flow path portions of the U-shaped flat tube portion.
In the folded portion of the concave portion for forming the fluid flow channel, a large number of small protrusions for forming the fluid mixing portion and a long convex portion for forming the rectifying portion have a height approximately twice the depth of the concave portion. And after the adjacent plates are overlapped, the U-shaped flat tube portion is provided at a position which is symmetrical left and right as a whole of the folded flow passage portion.
The left corner of the lower part is approximately twice the depth of the recess.
A substantially triangular reinforcing projection is provided when viewed from the front with a height.
The adjacent plates are superposed in layers in a state where the concave portions are opposed to each other, and the tip of the rectifying ridge is long in the vertical direction in the right and left linear flow path forming portion of the U-shaped fluid flow path forming concave portion. Parts are joined to the bottom wall of the straight flow path forming part of the opposing plate, and a large number of small projections , long projections, and reinforcing projections at the folded part of the U-shaped fluid flow path forming recess.
Each tip, is engaged against <br/> the bottom wall of the folded portion of the opposing plate, the turned-back channel portion of the U-shaped flat tube section, and the fluid mixing portion made of a large number of small projections, parallel-shaped According to the laminated heat exchanger of the present invention, the rectifying portion formed of a long convex portion of the plate is formed on both left and right straight channel forming portions of the U-shaped fluid channel forming concave portion of each plate. Since the long rectifying ridges are provided in the direction, the flow direction of the fluid in the left and right straight flow path portions of the U-shaped flat tube portion becomes linear, and the pressure loss of the fluid does not increase. And, in the folded portion of the U-shaped fluid channel forming concave portion of each plate, a fluid mixing portion is provided at the center thereof and a rectifying portion is provided on both outer sides of the fluid mixing portion, or at the center of the folded portion. Since the rectifying section is provided and the fluid mixing sections are provided on both outer sides of the rectifying section, the rectifying action and the mixing action are simultaneously performed in the folded flow path section of the U-shaped flat tube section, and the folded flow path section is provided. The fluid flow in the air can be smooth and the heat transfer coefficient can be improved. In addition, there is no stagnation or drift due to the flow of the fluid before and after the folded flow path portion of the U-shaped flat tube portion,
Performance can be improved.

In addition, the tips of the vertically long rectifying ridges in the right and left straight flow path forming portions of the U-shaped recess of each plate are joined to the bottom wall of the opposed straight flow path forming portion of the plate. In the folded portion of the concave portion, a large number of small protrusions , the long convex portion and the tip portion of the reinforcing convex portion are respectively joined to the bottom wall of the folded portion of the opposing plate, so that the joining area increases, and so-called point contact and Not
Since they are joined by surface contact, the pressure resistance increases.

Also, rectifying ridges which are long in the vertical direction are formed on both left and right straight flow path forming portions of the U-shaped fluid flow path forming recess of each plate, and the right and left sides of the U-shaped flat tube portion are formed after the adjacent plates are overlapped. Provided at symmetrical positions in the straight flow path portion, and at the folded portion of the concave portion, a large number of small protrusions to form a fluid mixing portion and a long convex portion to form a rectifying portion are formed on adjacent plates. Since the folded channel portion of the U-shaped flat tube portion is provided at a position which is left-right symmetrical as a whole after the superimposition, a long rectifying ridge, a long convex portion provided in the U-shaped fluid channel forming concave portion of each plate, and The number of projections is small,
Therefore, the shape of each plate is simple, the molding thereof is easy, the production thereof can be made easily and inexpensively, and the production cost of the laminated heat exchanger can be reduced.

[Brief description of the drawings]

FIG. 1 is a partially enlarged front view of a plate used in an embodiment of the present invention.

FIG. 2 is a front view of the plate.

FIG. 3 is an enlarged sectional view taken along line AA in FIG. 1;

FIG. 4 is an enlarged sectional view taken along line BB of FIG. 1;

FIG. 5 is an enlarged sectional view of a main part of the product of the present invention.

FIG. 6 is a schematic perspective view of the product of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 evaporator (laminated heat exchanger) 2 plate 3 U-shaped fluid flow path forming recesses 3a, 3b as viewed from the front 3b, right and left straight flow path forming portions 3c folded portion 4 header forming recesses 5 U-shaped flat viewed from the front substantially triangular tube portion 5a, as seen from 5b both left and right straight channel portion 5c turned-back channel portion 6 header 7 bottom wall 8 fluid passage hole 9 partitioning portion 10 fluid mixing unit 11 the rectification unit 12 small projections 13 long protrusions 14 front Reinforcement projections 15 and 16 in shape Vertical rectification projections long in the vertical direction 17 Bottom wall 18 Bottom wall of folded portion 19 Plate periphery

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-90992 (JP, A) JP-A-63-302294 (JP, A) JP-A-3-87595 (JP, A) JP-A-6-92 123582 (JP, A) Hikaru 1-169963 (JP, U) WO 93/13376 (WO, A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F28D 1/03 F28F 3 / 04

Claims (3)

(57) [Claims] 1. A substantially rectangular plate (2) has a U-shaped fluid flow path forming recess (3) as viewed from the front and two header forming recesses (4) (4) connected to the end thereof on one side thereof. A vertically long partition (9) is provided at the center of the fluid flow path forming recess (3).
Are provided from the upper end of the recess (3) to the portion closer to the lower end, the partition (9) has a height substantially equal to the depth of the recess (3), and the adjacent plates (2) ( 2) recesses each other to each other
(3) The layers (3), (4), and (4) are layered on top of each other , facing each other , and the opposing partitions (9) and (9) of both plates (2) and the peripheral edge (19) ) (19) by each other are joined together, the header portion continuous to the end portion of the plurality of flat tube portions of the U-shaped when viewed from the front (5) and the flat tube portion (5) and (6) (6) A fluid passage hole (8) is formed in the bottom wall (7) of each header forming recess (4) so that fluid can flow through all the flat tube sections (5) and the header section (6). In the stacked heat exchanger, the depth of the concave portion (3) is provided in both the left and right straight channel forming portions (3a) and (3b) of the U-shaped fluid channel forming concave portion (3) of each plate (2). Rectifying ridges (15) (1
6) are provided at positions symmetrical in the left and right straight flow path portions (5a) and (5b) of the U-shaped flat tube portion (5) after the adjacent plates (2) and (2) are overlapped, Fluid channel forming recess (3)
A large number of small projections (12) for forming the fluid mixing section (10) and a long projection (13) for forming the rectification section (11) are formed at the turn-back section (3c) of the recess (3). U-shaped flat tube section after the adjacent plates (2) and (2) are overlapped so as to have a height approximately twice as large
The folded flow path part (5c) of (5) is provided at a position symmetrical to the left and right as a whole, and is located at the left corner below the folded part (3c).
Is viewed from the front, which is almost twice as high as the depth of the recess (3).
A substantially triangular reinforcing projection (14) is provided , and the adjacent plates (2) (2) are layered with the recesses (3) (3) (4) (4) facing each other. In the right and left linear flow path forming portions (3a) and (3b) of the U-shaped fluid flow channel forming concave portion (3), the end portions of the rectifying ridges (15) and (16) long in the vertical direction face each other. It is joined to the bottom walls (17) and (17) of the straight flow path components (3a) and (3b) of the plate (2), and a large number of small holes are formed at the folded part (3c) of the U-shaped fluid flow path forming recess (3). Protrusions (12) , long protrusions (13) and reinforcement protrusions
Each tip, is engaged against the bottom wall (18) of the folded portion of the opposing plates (2) (3c), U-shaped flat tube portion (14) (5)
A fluid mixing section (10) composed of a number of small projections (12) and a rectifying section (1
1) A laminated heat exchanger in which is formed. 2. A folded channel portion (5c) of each U-shaped flat tube portion (5).
A rectification unit (11) is provided at the center of the rectification unit (1).
The stacked heat exchanger according to claim 1, wherein fluid mixing sections (10) (10) are provided on both outer sides of (1). 3. A folded channel portion (5c) of each U-shaped flat tube portion (5).
The stacked heat exchanger according to claim 1, wherein a fluid mixing section (10) is provided at a central portion of the heat exchanger, and rectifying sections (11) and (11) are provided on both outer sides of the fluid mixing section (10).