JPH0835788A - Stacked heat exchanger - Google Patents

Abstract

PURPOSE:To ensure a buckling strength against a compression load exerted from a lamination direction on the other end side in a longitudinal direction of a core plate, and to increase a fin installation space. CONSTITUTION:Inlet and outlet tanks 12 and 13 protruded toward the outer surface side are formed on one end side on a longitudinal direction of a bowl- form core plate 11 and a bent part 19 protruded in the same direction as the directions of the tanks 12 and 13 is provided. The bent part 19 is formed in a bent shape in cross section having a crest part positioned on the tip side in a longitudinal direction of the core plate 11 and a root part positioned on the opposite side to the crest part. A brazing surface 20 is formed at the tip of the bent part 19 in a state to be bent at right angles toward the tip side in a longitudinal direction of the core plate 11 from the position of the root part. The brazing surface 20 is brought into contact with the core plate 11 of an adjoining passage unit for joining.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a laminated heat exchanger, and is suitable as, for example, a refrigerant evaporator of an automobile air conditioner.

[0002]

2. Description of the Related Art Conventionally, a laminated heat exchanger of this type has a fluid passage (refrigerant) formed by facing a pair of bowl-shaped core plates as described in JP-B-4-34080. It has a structure in which a plurality of passage units are laminated and the laminated bodies are integrally brazed and joined.

In the laminated heat exchanger having such a structure, both the inlet tank and the outlet tank for the fluid are integrally formed at one end of the passage unit, and U is formed in the passage unit at the other end. A U-turn-shaped passage that makes a turn is formed, and corrugated fins that expand the air-side heat transfer area are interposed between the passage units and are integrally joined.

The distance between the passage units on one end side is set in both tanks, and the distance on the other end side is set by a bent portion integrally formed on the other end side of the core plate. By the way, in the above laminated heat exchanger, since the one end side of the passage unit is integrally formed with both the inlet tank and the outlet tank, a compressive load during core assembly and brazing (lamination of the passage unit Although it has sufficient strength against a compressive load applied from the direction, the other end of the passage unit receives the compressive load only at the bent portion integrally formed on the other end of the core plate. Therefore, there is a problem in that the strength of the space setting portion formed by the bent portion is insufficient, and the space setting portion formed by the bent portion easily buckles.

Therefore, in the above-mentioned publication, FIG.
As shown in FIG. 7, a bending portion 19 is formed on the other end side of the core plate 11 that constitutes the passage unit 10, and the bending portion 19 is formed into a corrugated cross-sectional shape to increase the cross-section coefficient and to increase the compression load. A brazing surface 20 extending in the longitudinal direction of the core plate (arrow A direction) is formed by bending at the tip of the bent portion 19 while opposing strength is increased, and the brazing surface 20 is provided between two adjacent passage units 10. By making contact with the joint portion of the core plate 11, the buckling strength on the other end side of the passage unit 10 is improved.

[0006]

However, in the above-mentioned publication, when the core plate 11 made of a metal such as aluminum is press-formed and the bent portion 19 and the brazing surface 20 are processed, the press-forming is easy. Therefore, since the brazing surface 20 is formed by bending the tip of the bent portion 19 having a corrugated cross-sectional shape in a direction extending further toward the tip side of the core plate, it has a corrugated cross-sectional shape in the longitudinal direction of the core plate. A dimension (dimension A in FIG. 7) in which the dimension of the brazing surface 20 is added to the dimension of the bent portion 19 is required, and the installation space of the corrugated fins is reduced by this dimension A, and the heat exchanger performance is reduced. There was a problem of causing the decrease of.

In view of the above points, an object of the present invention is to provide a laminated heat exchanger which can sufficiently secure the buckling strength of the gap setting portion by the bent portion and can expand the installation space of the corrugated fins.

[0008]

In order to achieve the above object, the present invention employs the following technical means. According to the first aspect of the present invention, a passage unit (10) is formed by stacking a plurality of bowl-shaped core plates (11) facing each other and joined together, and the core plate (1).
1) is formed at one end side in the longitudinal direction of the passage unit (10) so as to project to the outer surface side of the passage unit (10).
0) to and from the fluid, and an inlet tank (12) and an outlet tank (13) for setting an interval between the passage units (10) on one end side in the longitudinal direction of the core plate (11); A U-turn fluid formed in the core plate (11) so as to make a U-turn at the other end in the longitudinal direction of the core plate (11) from the inlet tank (12) toward the outlet tank (13). A passage (16) and a bent portion (19) formed at the other end in the longitudinal direction of the core plate (11) at a right angle so as to project in the same direction as the projecting direction of the tank. The bent portion (19) includes a crest (19a) located on the tip side in the longitudinal direction of the core plate (11), and a trough (19b) located on the side opposite to the crest (19a). The is formed to have a bent cross-sectional shape having, further, to the tip of the bent portion (19), the valley portions of the bent cross-section (19
There is provided a brazing surface (20) formed by bending at a right angle from the position b) toward the distal end side in the longitudinal direction of the core plate (11), and the brazing surface (20) is provided.
Is the core plate (1) of the adjacent passage unit (10).
1) is abutted against and joined to the passage unit (10) on the other end side in the longitudinal direction of the core plate (11) from the bent portion (19) and the brazing surface (20). It features a stacked heat exchanger with a set spacing.

According to the second aspect of the present invention, the passage unit (10) is constructed by laminating a plurality of bowl-shaped core plates (11) facing each other and laminated in a plurality of stages.
And one end of the core plate (11) in the longitudinal direction so as to project to the outer surface side of the passage unit (10) to allow the fluid to flow into and out of the passage unit (10), and 11) an inlet tank (12) and an outlet tank (13) for setting a space between the passage units (10) on one end side in the longitudinal direction, and from the inlet tank (12) to the outlet tank (13) A U-turn-shaped fluid passageway (16) formed in the core plate (11) so as to make a U-turn at the other end in the longitudinal direction of the core plate (11), and a longitudinal direction of the core plate (11). On the other end side, there are provided bent portions (19) and (19) which are bent at right angles so as to project in the same direction as the projecting direction of the tank. (19), Yamabe (19a) and valleys (19b) is formed to have a bent cross-sectional shape having, further, the bent portion (19)
At the tip of (19), the mountain portion (19
a), a brazing surface (20) bent at a right angle so as to be substantially within the bending range of the valley portion (19b) is provided, and the brazing surface (20) is provided in the adjacent passage unit (10). The core plate (1) of the core plate (1) is brought into contact with and joined to the core plate (11) of FIG.
1) The passage unit (1
0) It is characterized by a laminated heat exchanger in which the mutual intervals are set.

According to a third aspect of the present invention, in the laminated heat exchanger according to the first or second aspect, the bent portion (19) has the peak portion (19a) at the center and the valley portion. (19b) is formed so as to be located on both the left and right sides of the crest (19a), and the brazing surface (20) is formed at the positions of the troughs (19b) on both the left and right sides. Characterize.

According to a fourth aspect of the present invention, in the laminated heat exchanger according to any one of the first to third aspects, the core plate (11) is made of an aluminum material having front and back surfaces clad with a brazing material. The aluminum material is pressed, and the bent portion (19) and the brazing surface (20) are integrally bent and formed on the core plate (11).

The reference numerals in parentheses of the above means indicate the correspondence with the concrete means described in the embodiments described later.

[0013]

According to the inventions of claims 1 to 4,
Since it has the above technical means, the bent portion (19)
Is formed in a shape having a bent cross-sectional shape having a peak portion (19a) and a valley portion (19b), the cross-section coefficient of the bent portion (19) is increased to increase the passage unit (10) from the stacking direction. It is possible to improve the strength against the compressive load and to sufficiently secure the buckling strength of the gap setting part by the bent part (19).

Moreover, the brazing surface (20) is bent at a right angle at the tip of the bent portion (19) so as to be substantially within the bending range of the peak portion (19a) and the valley portion (19b) of the bent cross-sectional shape. Since it is formed, the space in the longitudinal direction a of the core plate (11) required to form the bent portion (19) and the brazing surface (20) can be minimized.

Therefore, the installation space for the bent portions (19) and the brazing surface (20) can be reduced as compared with the prior art, and the installation space for the corrugated fins (18) can be expanded by that amount, and heat exchange can be performed. Performance can be improved.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show an embodiment, this embodiment is an example applied to a refrigerant evaporator of an automobile air conditioner, and FIG. 1 shows two core plates 11 constituting a passage unit 10,
11 shows the front shape of 11. In FIG. 1, the core plate 1
Reference numeral 1 denotes a bowl-shaped recess on the back side of the paper surface of FIG. 3, which is a thin plate having a thickness of about 0.5 mm, and a brazing material is coated (clad) on both front and back surfaces thereof.

Specifically, the core material is made of A3003 material, and the brazing material as the skin material is made of A4004 material.
The shape of is formed by pressing from one plate. The core plate 11 has a generally rectangular shape as a whole, and one end side in the longitudinal direction is formed to have a rounded outer shape, and at one end side thereof, an inlet for allowing the refrigerant to flow into and out of the passage unit 10. The tank 12 and the outlet tank 13 are formed adjacent to each other in the width direction of the core plate (left-right direction in FIG. 3).

The two tanks 12 and 13 are formed in a shape projecting in a circular shape to the back side of the paper surface of FIG. 3 (in other words, the outer surface side of the passage unit 10), and the two tanks 12 and 13 are formed.
The central portion of 13 is provided with openings 12a and 13a for communicating with the tank of another adjacent passage unit 10. The tanks 12 and 13 can be used by reversing the inlet and the outlet in the widthwise direction of the core plate, and which tank is the inlet side or the outlet side can be arbitrarily selected.

Between the inlet tank 12 and the outlet tank 13, a refrigerant passage (fluid passage) 16 defined by a projecting portion 14 at the peripheral edge and a partition wall 15 at the center is formed. The coolant passage 16 is formed in a U-turn shape that makes a U-turn on the other end side in the longitudinal direction of the core plate 11. In this U-turn-shaped refrigerant passage 16, a large number of ribs 17 are formed so as to project over the entire length of the passage. The ribs 17 increase the heat exchange area on the refrigerant side and form turbulence in the flow. It is designed to increase the heat transfer coefficient.

A bowl-shaped core plate 1 constructed in this way
As shown in FIGS. 2 and 3, one passage unit 10 is constructed by superposing and joining two sheets as one set. When the two core plates 11 are superposed, the ribs 17 cross each other in a cross shape. Corrugated fins 18 are arranged between the outer surfaces of the passage units 10.

As shown in FIGS. 2, 3, and 4, the passage unit 10 and the corrugated fins 18 are laminated in a large number. When the lamination is performed, the distance between the passage units 10 on one end side of the core plate 11 is the same as that of the tank. The distance between the passage units 10 is set to a predetermined distance by 12, 13, but at the other end of the core plate 11, the distance between the passage units 10 is set to a predetermined distance by a bent portion integrally formed on the core plate 11.

The present invention is characterized by the above-mentioned bent portion structure, and the bent portion structure will be described in detail below. FIG. 5 is an enlarged view of the X portion of FIG. 1. As shown in FIGS. 2 to 5, tanks 12 and 13 are provided at the other end of the core plate 11 in the longitudinal direction (the direction of arrow A in FIG. 5).
So that it projects in the same direction as the projecting direction of
9 is bent at a right angle. The bent portion 19 is formed to have a bent cross-sectional shape having a ridge portion 19a located on the tip side in the longitudinal direction of the core plate 11 and a valley portion 19b located on the opposite tip side of the ridge portion 19a. There is.

Further, at the tip of the bent portion 19, a brazing surface 20 is bent at a right angle toward the tip side in the longitudinal direction of the core plate 11 at the position of the valley portion 19b. The brazing surface 20 is brought into contact with the core plates 11 of the adjacent passage units 10 and joined by brazing, and the passage unit 10 on the other end side in the longitudinal direction of the core plate 11 is joined by the bent portion 19 and the brazing surface 20. The distance between them is set.

In this example, the bent portion 19 is formed as the mountain portion 1
9a is located in the center and the valleys 19b are formed on the left and right sides of the crest 19a, so that the brazing surfaces 20 are formed on the left and right sides of the valleys 19b. Then, as shown in FIGS. 1 and 3, on the other end side in the longitudinal direction of the core plate 11, the bent portion 19 is formed in a substantially left half portion,
The brazing surface 20 of the bent portion 19 of the adjacent passage unit 10 is in contact with and joined to the substantially right half portion, and two receiving surfaces 21 are formed by bending. A positioning piece 22 is bent and formed between the two receiving surfaces 21. As shown in FIG. 3, the positioning piece 22 has a mountain portion 19a of the bent portion 19 of the adjacent passage unit 10.
It is located on the outer side of the core plate 11 and eliminates the displacement of the core plate 11 in the longitudinal direction.

As described above, the brazing surface 20 has the mountain portion 1
Since the valley portion 19b located on the side opposite to the tip side of 9a is bent at a right angle toward the tip side in the longitudinal direction a of the core plate 11, as shown in FIG.
These two portions 19 and 20 can be formed so that the width W of the bending range of the peaks and valleys of the cross-sectional shape of 9 and the brazing surface 20 substantially overlap.

Therefore, the bent portion 19 and the brazing surface 20
It is possible to minimize the space in the longitudinal direction of the core plate 11 required to form the corrugated fins and the brazing surface 20, and to reduce the installation space for the corrugated fins 18. Space can be expanded and heat exchange performance can be improved. In manufacturing the above-described refrigerant evaporator, the passage unit 10 configured by facing two core plates 11 and the corrugated fins 18 are alternately laminated as shown in FIG. 2 and temporarily assembled. Hold the assembled state with a jig, carry it into a brazing heating furnace, heat the evaporator assembly to a predetermined brazing temperature, melt the brazing material, and join the parts. Braze the part.

Since the operation of the refrigerant evaporator of this embodiment is the same as that of the conventional product, its explanation is omitted. In addition, in the above-described embodiment, the peak portion 19a is arranged in the center of the bent portion 19 and the valley portions 19b are arranged on both left and right sides thereof, but a shape in which the valley portion 19b is arranged only on one side of the peak portion 19a is also possible. Alternatively, two or more peaks 19a and valleys 19b may be alternately arranged. Further, the mountain portion 19a is shown in FIG.
The peak portion 19a may be corrugated instead of the shape having a flat continuous top portion as shown in (a).

Thus, the bent portion 1 according to the present invention.
9 can be carried out in various forms. In short, the core plate 11 has a ridge portion 19a located on the tip side in the longitudinal direction a and a trough portion 19b located on the opposite tip side.
In addition, the brazing surface 20 may be bent at a right angle toward the tip side of the core plate 11 in the longitudinal direction B. Further, in the above-described embodiment, the positioning piece 22 located outside the mountain portion 19a of the bent portion 19 of the adjacent passage unit 10 is formed by bending the other end side of the core plate 11 in the longitudinal direction. 22 is not essential for achieving the object of the present invention, and can be eliminated.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a core plate according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a refrigerant evaporator according to an embodiment of the present invention.

FIG. 3 is an enlarged perspective view of a main part of FIG.

FIG. 4 is a partially enlarged front view showing a main part of a refrigerant evaporator according to an embodiment of the present invention.

5 (a) and 5 (b) are a side view and a front view showing an enlarged X part of FIG.

FIG. 6 is a partially enlarged front view showing a main part of a conventional refrigerant evaporator.

7 (a) and 7 (b) are a side view and a front view showing an enlarged main part of FIG.

[Explanation of symbols]

 10 passage unit 11 core plate 12 inlet tank 13 outlet tank 16 fluid passage 19 bent portion 19a mountain portion 19b valley portion 20 brazing surface

Claims (4)

[Claims] 1. A passage unit formed by joining a pair of bowl-shaped core plates facing each other and being laminated in a plurality of stages, and one end in the longitudinal direction of the core plate protruding toward the outer surface side of the passage unit. An inlet tank and an outlet tank that are configured to have a space between the passage units on one end side in the longitudinal direction of the core plate while allowing the fluid to flow in and out of the passage unit, and the inlet tank to the outlet tank. The U-turn-shaped fluid passage formed in the core plate so as to make a U-turn at the other end in the longitudinal direction of the core plate, and the protrusion of the tank at the other end in the longitudinal direction of the core plate. A bending portion formed by bending at a right angle so as to project in the same direction as the direction, It is formed to have a bent cross-sectional shape having a ridge portion located on the distal end side in the longitudinal direction of the table and a trough portion located on the side opposite to the ridge portion, and further, at the tip of the bent portion. Is provided with a brazing surface formed by bending at a right angle from the position of the valley portion of the bent cross-sectional shape toward the distal end side in the longitudinal direction of the core plate. It is configured so as to come into contact with and be joined to a core plate, and a space between the passage units on the other end side in the longitudinal direction of the core plate with respect to the bent portion and the brazing surface is set. Stackable heat exchanger. 2. A passage unit formed by joining a pair of bowl-shaped core plates facing each other and being stacked in a plurality of stages, and one end in the longitudinal direction of the core plate projecting to the outer surface side of the passage unit. An inlet tank and an outlet tank that are configured to have a space between the passage units on one end side in the longitudinal direction of the core plate while allowing the fluid to flow in and out of the passage unit, and the inlet tank to the outlet tank. The U-turn-shaped fluid passage formed in the core plate so as to make a U-turn at the other end in the longitudinal direction of the core plate, and the protrusion of the tank at the other end in the longitudinal direction of the core plate. A bent portion formed by bending at a right angle so as to project in the same direction as the direction, and the bent portion Is formed so as to have a bent cross-sectional shape with a bent portion, and is bent at the tip of the bent portion at a right angle so as to be substantially within the bending range of the peaks and valleys of the bent cross-sectional shape. A brazed surface which is adapted to abut and be joined to a core plate of an adjacent passage unit, and which is longer than the bent portion and the brazed surface. A laminated heat exchanger, wherein a distance between the passage units on the other end side in the direction is set. 3. The bent portion is formed so that the crest portion is located at the center and the trough portions are located on both left and right sides of the crest portion, and the brazing surface is on the left and right troughs. The laminated heat exchanger according to claim 1 or 2, wherein the laminated heat exchanger is formed at each position. 4. The core plate is made of an aluminum material having front and back surfaces clad with a brazing material, and the aluminum material is pressed to form the bent portion and the brazing surface integrally with the core plate. The laminated heat exchanger according to any one of claims 1 to 3, wherein: