JPH09113171A - Stacked heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stacked heat exchanger in which the strength of a tank part is increased without increasing the total weight. SOLUTION: In a heat exchanger in which a tube element 1 provided with a bulged tank part 4 is formed at least on one end of a flattened tubular part 3 by joining a circumferential end part of a pair of drawn core plates 11, and a plurality of tube elements 1 and outer fins 2 are alternately stacked, one layer or a plurality of layers of reinforcement plates 7 are joined in a stacked state with at least either of outer surface or inner surface of the tank part 4 of the tube element 1. The reinforcement plate is preferably formed by folding back the end part of the core plate, and a stopper to lock the end part of an outer fin is preferably formed by providing the end part of the riser shape on the flattened tubular part side of the reinforcement plate.

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 automobiles, industries, etc., that is, a plurality of plate-shaped tube elements having heat exchange medium passages, including outer fins between them. The present invention relates to a heat exchanger of a type laminated via an air circulation gap, and particularly to a laminated heat exchanger preferably used as a condenser.

[0002]

2. Description of the Related Art Generally, as shown in FIGS. 2 to 4, the tube element of a laminated heat exchanger of this type has at least one end of a flat tube portion (3) as a refrigerant passage for storing a refrigerant. It is configured to have a bulging tank portion (4). And such a tube element (1)
As one known as the above, two dish-shaped core plates (11) and (11) are overlapped with each other so as to face each other and joined at a peripheral end portion.

Each core plate (11) constituting such a tube element has a bottom shallow recess (11a) for forming a flat tube portion and a bulge (11b) for forming a tank portion at least at one end of the bottom shallow recess. ) Is formed.

Thus, the core plate (11) as described above
The flat shallow recesses (11a) for forming flat tubes and the bulging parts (11b) for forming tanks are generally formed by pressing a plate material made of aluminum (including its alloys; the same applies below) in the wall thickness direction. It is produced by doing.

[0005]

When the laminated heat exchanger as described above is used as a condenser, a high internal pressure acts on the tube element (1) in actual use. The tube element must be strong enough to withstand this. In addition, there is a possibility that an undesired external force is applied to the tube element (1) during transportation and transportation of the product or handling work.

However, since the core plate (11) is formed by drawing a plate material, a bulging portion (11b) for forming a tank portion (4) which undergoes a particularly large deformation as shown in FIG.
) Is relatively thin, and therefore, the strength of the tank portion (4) of the tube element (1) is the weakest, and there is a drawback in that this portion may be broken by internal pressure or external force. In FIG. 12, (5) is a heat exchange medium flow hole.

Further, in order to improve the heat exchange efficiency, the inner fins (6) may be loaded in a joined state in the flat tube portion (3) of the tube element (1). In this case, the inner fin (6) serves as a reinforcing material to increase the strength of the flat tube portion (3), but since the inner fin (6) does not exist in the tank portion (4), the inner fin (6) is used. It was not possible to expect a reinforcing effect on the tank part (4).

Of course, by increasing the thickness of the base plate of the core plate (11), the tank portion (4) after the deformation of the diaphragm is formed.
Although it has been attempted to secure the necessary wall thickness of the tube element (1), the wall thickness of the tube element (1) as a whole becomes thicker, resulting in an increase in the overall weight.

The present invention has been made in view of the above technical background, and an object thereof is to provide a laminated heat exchanger in which the strength of the tank portion is increased without increasing the overall weight. It is a thing.

[0010]

In order to achieve the above object, the present invention does not increase the wall thickness of the entire tube element, but forms a plate material of one layer or a plurality of layers on the outer surface of the tank portion. The tank portion is reinforced by joining.

That is, according to the present invention, referring to the reference numerals of the drawings, at least the flat tube portion (3) is formed by joining a pair of drawn core plates (11) at their peripheral end portions. A heat exchanger in which a tube element (1) having a bulging tank portion (4) is formed at one end and a plurality of the tube element (1) and outer fins (2) are alternately laminated It is characterized in that one or more layers of reinforcing plates (7) are joined in a laminated state to at least one of the outer surface and the inner surface of the tank portion (4) of the tube element (1).

As described above, the reinforcing plate (7) of one layer or a plurality of layers is joined in a laminated state to at least one of the outer surface and the inner surface of the tank portion (4) of the tube element (1), so that the core is formed. The strength of the tank portion (4) thinned by drawing the plate (11) can be supplemented by the reinforcing plate (7). Therefore, when a large internal pressure is applied to the tank portion (4) or a large external force is applied as in the case where the tank portion (4) is used as a condenser, breakage or breakage of the tank portion (4) that has conventionally occurred is prevented, The heat exchanger has excellent durability. Moreover, the tube element (1)
Since the tank portion is reinforced without increasing the overall thickness, the heat exchanger is not significantly increased in weight.

Further, it is preferable that the reinforcing plate (7) is formed by folding the end portion of the core plate (11). In this case, since the core plate and the reinforcing plate are configured as a continuous body at the edges, the separation preventing force between the core plate and the reinforcing plate becomes large, and the reinforcing plate and the core plate are joined as separate members. Compared with the case, a larger effect of reinforcing the tank portion is exhibited.

Further, since the end portion of the reinforcing plate (7) on the side of the flat tube portion (3) is formed in a rising shape, a stopper (8) for locking the end portion of the outer fin (2) is formed. Is also recommended. In this case, the outer fins (2) are positioned at proper positions by the stoppers (8) during assembly, and a high quality heat exchanger in which the positions of the outer fins (2) are aligned can be obtained.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be specifically described with reference to the drawings. In this embodiment, the present invention is applied to an aluminum condenser for an air conditioner such as a car air conditioner.

In the condenser shown in FIGS. 2 to 4, (1) is a plurality of plate-shaped tube elements arranged in a horizontal state and vertically, and (2) is an adjacent tube element (1). ) (1) It is an outer fin interposed between.

The tube element (1) has a flat tube portion (3) which is a refrigerant passage in an intermediate portion thereof, and communicates with the flat tube portion (3) at both ends so that the bulging height is relatively high. The tank has a large tank portion (4), and a refrigerant flow hole (5) is formed on the top surface of each tank portion. And
The tank portions (4) of the adjacent tube elements (1) are brazed and integrated with each other in a state of being communicated with each other through the refrigerant circulation holes (5). The outermost tube element is formed only on one tank portion. As shown in FIG. 1, the tube element (1) includes a pair of upper and lower dish-shaped core plates (11) (1
It consists of 1).

As shown in FIG. 2, each core plate (11) has a flat concave portion (11a) for forming a flat tube portion of the tube element in the middle portion, and the flat concave portion (11a) is formed in the flat concave portion (11a). At both ends, a bulge (11b) having a relatively large bulge height for forming the tank (4) is provided, and the bulge (11
It has a circular refrigerant flow hole (5) on the top surface of b). Further, a flat joint surface (12) having a predetermined width is formed on the peripheral portion of the core plate (11). Such a core plate (11) is manufactured by drawing an aluminum sheet by pressing. Thus, in this embodiment, as the core plate (11), the aluminum brazing sheet in which both surfaces of the core material are coated with the brazing material is used. Then, a pair of such core plates (11) are superposed so that the joint surface (12) is in contact with each other, and the two are brazed at the joint surface to form the tube element (1).

Further, the flat tube portion (3) of each tube element (1) is provided with a multi-entry type inner fin (6) made of aluminum and having an overall size, and the tank portions (4) on both sides in the flow direction. It is loaded along the direction connecting (4).

The outer fin (2) has a width similar to that of the tube element (1) and is brazed to the flat tube portion (3) of the tube element. As the outer fin (2), a corrugated fin made of aluminum is generally used, and preferably a louver is cut and raised.

By the way, as shown in FIG. 1, each of the tube elements (1) has both tank portions (4).
One aluminum reinforcing plate (7) is joined in a manner of covering the entire outer surface of (4). This reinforcement plate (7)
Plays a role of reinforcing the strength of the tank portion (4), which is thinned by drawing the core plate (11). As shown in FIG. 5, such a reinforcing plate (7) is preliminarily bonded to the outer surface of the base plate (20) for the core plate (11) made of a brazing sheet at a predetermined position of the tank portion by pasting or the like. It is drawn together with the plate (20). Therefore, the reinforcing plate (7) is the base plate (20).
It is desirable to use the same material as the above and set the elongation of the reinforcing plate (7) and the elongation of the base plate (20) by drawing to be equal. Since the reinforcing plate (7) is brazed to the tank portion (4) of the adjacent tube element (1) in the laminated state of the tube element (1), it is preferable to use a double-sided aluminum brazing sheet.

In the heat exchanger according to the illustrated embodiment, after the core plate (11) is manufactured, the tube element (1) and the outer fin are formed by using the core plate, the outer fin (2), the inner fin (6) and the like. (2) and (2) are assembled in a heat exchanger assembly arranged in an alternating laminated state, and then the respective members are collectively brazed. By this brazing, the base plate (20) of the core plate (11) and the reinforcing plate (7) are also brazed.

In the heat exchanger manufactured in this way,
The tank element (4) of the uppermost tube element (1) enters into the tank section (4) of the uppermost tube element (1) from an inlet pipe (not shown), and each tank section in the same row connected to this is filled and then each tube element is connected to the other tank It flows to the part (4), during which the tu
After exchanging heat with the air flowing through the air flow gap including the outer fins (2) between the sub-elements (1) and (1), an outlet pipe (not shown) from the tank portion (4) of the lowermost tube element (1) Flows out of the vessel through.

During operation of such a heat exchanger, the tube element (1) receives a large internal pressure due to the refrigerant. Since the reinforcing plate (7) is joined to the outer surface of the tank portion (4) thinned by drawing the core plate (11), the strength of the tank portion (4) is reduced. Since it is compensated by (7), it is possible to prevent breakage or the like that may occur in the conventional tank portion (4). Further, even when an undesired external force is applied from the outside of the tank portion (4), the risk of destruction of the tank portion (4) can be similarly reduced.

6 and 7 show another embodiment of the present invention. In addition, in the following embodiments, FIG.
The same names as those shown in FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted. In the embodiment shown in FIGS. 6 and 7, the end portion of the reinforcing plate (7) of the tank portion (4) of the tube element (1) on the side of the flat pipe portion (3) extends in the width direction of the tank portion (4). A stopper (8) is formed by being raised at right angles to the outer surface of the flat tube portion (3). And this stopper (8)
The lengthwise ends of the outer fins (2) are engaged with the outer fins (2), and in this state, the outer fins (2) and the upper and lower tube elements (1) (1) sandwiching the outer fins (2) are brazed together. By providing such a stopper (8), when assembling the heat exchanger, the edge of the outer fin (2) is locked to the stopper (8) and the outer fin (2).
Therefore, it is possible to easily secure a proper mounting position of the outer fin (2). The stopper (8)
It is preferable that the formation of 1 is already formed at the stage of joining the reinforcing plate (7) to the core plate base plate (20) as shown in FIG. 7.

FIGS. 8 and 9 show still another embodiment of the present invention. In this embodiment, the reinforcing plate (7) of the tank part (4) is formed by folding the end of the core plate (11). That is, as shown in FIG. 9, the end plate of the aluminum brazing sheet base plate (20) for forming the core plate is folded back in half to form a two-layer structure, and in this state, it is draw-formed for the tank part. The bulge (11b) is formed. Then, the reinforcing plate (7) is joined to the outer surface of the tank portion (4) by brazing the overlapping surfaces of the folded portion and the non-folded portion of the core plate together with the brazing joining of the respective components of the heat exchanger. It has been done. In this way, when the reinforcing plate (7) is formed by folding the end portion of the core plate (11), the core plate (11) and the reinforcing plate (7) are edged. Since the core plate (11) and the reinforcing plate (7) have a large separation preventing force because they are configured as a continuous integrated body, when the reinforcing plate (7) and the core plate (11) are joined as separate members. Compared to this, a greater tank reinforcement effect is exhibited.

In FIGS. 10 and 11, the end portion of the reinforcing plate (7) formed by folding the end portion of the core plate (11) is bent at a right angle so that the outer fin (2) is bent. 1 shows an embodiment in which a stopper (8) for locking is formed. Such a stopper (8) is shown in FIG.
As shown in FIG. 1, it is preferable to form the core plate base plate (20) at the same time when the end portions of the base plate (20) are folded back and the reinforcing plate (7) is joined.

In the above embodiments, the case where the reinforcing plate (7) is joined to the outer surface of the tank portion (4) is shown, but it may be joined to the inner surface of the tank portion (4). Also,
Although the reinforcing plate (7) is shown to have only one layer, it may have two or more layers.

The present invention is preferably applied to a condenser to which a large internal pressure is applied to the tank portion, but the present invention is not limited to the condenser and may be used for an evaporator, a radiator, an oil cooler and the like. Of course.

[0030]

As described above, according to the present invention, a pair of core plates that have been drawn are joined at their peripheral end portions, so that at least one end of the flat tube portion has a bulging tank portion. In a heat exchanger in which a tube element is formed and a plurality of tube elements and outer fins are alternately laminated, at least one of the outer surface and the inner surface of the tank portion of the tube element,
Since one layer or a plurality of layers of reinforcing plates are joined in a laminated state, the reinforcing plate can supplement the strength of the tank portion which is thinned by drawing the core plate.
Therefore, especially when a large internal pressure is applied to the tank part such as when it is used as a condenser, or when a large external force is applied, it is possible to prevent breakage and breakage of the tank part that has occurred conventionally, and it has excellent durability. It can be used as a heat exchanger. Moreover, since the tank portion can be reinforced without increasing the overall wall thickness of the tube element, the weight of the heat exchanger is not significantly increased.

When the reinforcing plate is formed by forming the end portion of the core plate into a folded shape, the core plate and the reinforcing plate are formed as a continuous body at the end edges, so that the core plate is formed. The separation preventing force between the reinforcing plate and the reinforcing plate can be increased, and a greater tank portion reinforcing effect can be exhibited as compared with the case where the reinforcing plate and the core plate are joined as separate members.

Further, when the end portion of the reinforcing plate on the side of the flat tube portion is formed in a rising shape so that a stopper for locking the end portion of the outer fin is formed, the outer fin is attached at the assembly stage. The heat exchanger can be positioned at an appropriate position by the stopper, and it can be a high-quality heat exchanger with a good appearance in which the outer fins are aligned.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is shown in FIG.
FIG. 2 is a sectional view taken along line I.

FIG. 2 is a perspective view of a laminated heat exchanger according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a tube element and fins separately.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a perspective view for explaining a manufacturing process of a molded plate that constitutes a tube element.

FIG. 6 is a sectional view corresponding to FIG. 1 showing another embodiment of the present invention.

FIG. 7 is a perspective view for explaining a manufacturing process of a molding plate that constitutes the tube element of FIG.

FIG. 8 is a sectional view corresponding to FIG. 1 showing still another embodiment of the present invention.

FIG. 9 is a perspective view for explaining a manufacturing process of a forming plate that forms the tube element of FIG.

FIG. 10 is a sectional view corresponding to FIG. 1 showing still another embodiment of the present invention.

FIG. 11 is a perspective view for explaining a manufacturing process of the molding plate that forms the tube element of FIG.

FIG. 12 is a cross-sectional view corresponding to FIG. 1 showing a conventional laminated heat exchanger.

[Explanation of symbols]

 1 ... Tube element 2 ... Outer fin 3 ... Flat tube part 4 ... Tank part 7 ... Reinforcement plate 8 ... Stopper 11 ... Core plate

Claims (3)

[Claims] 1. A bulging tank portion (4) is provided on at least one end of a flat tube portion (3) by joining a pair of drawn core plates (11) at their peripheral end portions. A tubular element (1) is formed,
This tube element (1) and outer fin (2)
In the heat exchanger in which a plurality of layers are alternately laminated, one or a plurality of layers of reinforcing plates (7) are laminated on at least one of the outer surface and the inner surface of the tank portion (4) of the tube element (1). A laminated heat exchanger characterized by being joined together. 2. The laminated heat exchanger according to claim 1, wherein the reinforcing plate (7) is formed by folding the end of the core plate (11). 3. A stopper (8) for locking the end of the outer fin (2) is formed by making the end of the reinforcing plate (7) on the side of the flat tube (3) stand up. The laminated heat exchanger according to claim 1 or 2.