JPH09222285A - Heat-exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve fluid erosion resistance by a method wherein the throttle surface of the groove part of a molding plate in the vicinity of the U-turn part of a tube element through which a heat-exchange refrigerant passes is formed at a gentle angle with a brazing margin. SOLUTION: A heat-exchange medium flows through an inflow port 8 of a tube element 2, and a pipe part 11 the direction of which is changed at a U-turn part 18 of a tip 9 and is returned to an outflow port 10 again is provided. The tube element 2 is formed in such a manner that two molding plated 12 and 12 are arranged face to face. The molding plate 12 is provided at a periphery with brazing margins 13 at which the molding plates are joined together when joining face to face is effected. A groove part 14 is provided at an inner side with a pipe part 11 through which a heat-exchange medium flows, and a partition wall 15 by which the medium is caused to flow in an U-shape is arranged in a longitudinal direction with a part of a tip left non-joined. This constitution forms a fillet in a large size, keeps a thickness at a desired value, and improves fluid erosion resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger, and more particularly to a heat exchanger suitable for use as a heater core of an air conditioner for automobiles.

[0002]

2. Description of the Related Art In a laminated heat exchanger, a heat exchange medium is sent into the heat exchanger, and at the same time, the heat exchange medium circulated in the heat exchanger is sent to the outside of the heat exchanger, and a plurality of layers are laminated through fins. And a tube element for circulating the heat exchange medium sent from the tank in the heat exchanger. Conventionally, as an example of the structure of a tube element, there is an example shown in JP-A-5-69732.

In this known example, there are two tube elements.
It consists of a number of molded plates that are joined together in the middle. This molded plate has a brazing allowance around it and a groove part inside, and has a partition wall that does not reach the tip at the center of the groove part. . Therefore, in the tube element, the heat exchange medium flows from one side at the partition wall, changes its direction at the U-turn portion at the tip, and flows to the other side.

[0004]

However, in the tube element used in the above heat exchanger, the narrowing surface of the groove portion of the forming plate forming the pipe portion near the U-turn portion where the direction of the heat exchange medium changes is recommended. It rises sharply at around 70 to 80 degrees relative to the surplus. Therefore,
When brazing in a furnace using a clad material having a brazing material clad on the surface, it is not possible to form a large braze fillet following the joint surface. Therefore, the U-turn portion, which is a portion that is easily affected by fluid erosion, is particularly susceptible to that effect. In addition, since the drawing surface of the groove portion of the forming plate rises sharply with respect to the brazing allowance, the plate thickness tends to be thin due to processing, which is also one of the factors easily affected by fluid erosion. There is.

Therefore, the present invention has been made in view of the above reasons.
An object of the present invention is to provide a heat exchanger having improved fluid erosion resistance.

[0006]

In order to achieve the above-mentioned object, the heat exchanger of the present application is a tube element formed by joining a brazing allowance to the periphery and a forming plate having a groove formed inside thereof. In a heat exchanger configured by alternately stacking a plurality of fins and fins, the throttle surface of the groove portion of the forming plate near the U-turn portion of the tube element through which the heat exchange medium passes forms a gentle angle with respect to the brazing allowance. It is characterized in that it is formed as described above (Claim 1).

Therefore, according to the present invention, when the assembled heat exchanger is placed in a furnace and subjected to a brazing process by a so-called heat brazing method, molding is performed in the vicinity of the U-turn portion of the pipe portion through which the heat exchange medium flows. Since the drawing surface of the groove portion of the plate forms a gentle angle with respect to the brazing allowance, a large braze fillet can be formed on the drawing surface, and the drawing surface of the groove portion of the groove portion can be formed when the forming plate is formed by a processing machine. The plate thickness can be maintained at a desired thickness.

[0008]

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

FIG. 1 shows a one-tank type heat exchanger 1, in which a large number of tube elements 2 through which a heat exchange medium flows are stacked with fins 3 interposed therebetween, and a tank 4 is provided at one end of the tube element 2. It is distributed. The tank 4 is a rectangular parallelepiped extending in the stacking direction of the tube elements 2 and is placed on the end plate 5 to serve as a space for storing a heat exchange medium therein. It is divided into an inlet side and an outlet side, and inlet / outlet pipes 6, 6 are connected to the respective spaces.

FIG. 2 shows a tube element 2 which is laminated in a plurality of stages with fins 3 interposed therebetween. The tube element 2 has a substantially rectangular shape, and the heat exchange medium flows from the inflow port 8 of the base 7, and the U-turn part 18 of the tip 9 is provided.
The pipe part 1 which changes the direction at and returns to the outlet 10 of the base part 7 again.
One. And this tube element 2
Is attached by inserting the base portion 7 side into the connection hole (not shown) of the end plate 5 described above.

The tube element 2 is constructed by joining two molding plates 12, 12 which are molded from an aluminum alloy whose main material is aluminum whose surface is clad with a brazing material, in the middle. As shown in FIG. 3, the molding plate 12 includes a brazing allowance 13 which is brazed when the peripheral parts are joined together, and a groove portion 14 forming a pipe portion 11 through which a heat exchange medium flows inside. And a partition wall 15 for flowing in a U shape is provided in the longitudinal direction leaving a part of the tip.

The forming plate 12 is formed by pressing or roll homing, and as shown in FIGS. 3 and 4, the drawing surface 17a of the groove 14 sharply rises from the brazing allowance 13. Therefore, the tube element 2
When configured as described above, as shown in FIG. 4, the angle formed by the drawing surfaces 17a, 17a of the upper and lower molding plates is large. On the other hand, the groove 1 near the U-turn 18 at the tip
The diaphragm surface 17b of No. 4 rises more gently than the diaphragm surface 17a described above. Therefore, when configured as the tube element 2, as shown in FIG. 5, the throttle surfaces 17b, 17b of the upper and lower joined plate 12 are joined together.
The angle formed by is small. Further, a protruding piece 16 for maintaining a predetermined dimension between the tube elements 2 is formed at the tip of the molding plate 12.

An explanation of the brazing condition of the brazing allowance 13 of the tube element 2 during brazing in the furnace is shown in FIG. 6, and the rising angle (θ) of the throttle surface 17b of the groove 14 is shown.
2) is gentle, so that the drawing surface 1 of the groove 14 is
Since the angle formed by 7b and 17b is small, the braze fillet 19 projects to the side of the conduit 11 to increase the strength. By the way, the rising angle (θ1) of the diaphragm surface 17a (shown by the dotted line) of the groove 14 is sharp.

When the forming plate 12 constituting the tube element 2 is formed by pressing or the like, the groove portion 14 is formed.
It is possible to moderate the rise of the throttle surface 17b from the brazing allowance 13 and maintain the plate thickness at a desired thickness. That is, it is possible to prevent lean meat.

[0015]

As described above, according to the present invention,
In the vicinity of the U-turn part of the tube part of the tube element that is most susceptible to the effects of fluid erosion, the rise of the throttle surface of the groove part that constitutes the conduit from the brazing allowance is moderated, so the angle formed by the pair of throttle surfaces is also The smaller fillet can be made larger in the conduit. In addition, by loosening the drawing surface from the brazing allowance of the drawing surface of the groove portion of the forming plate, it is possible to maintain the plate thickness at a desired thickness and improve the fluid erosion resistance in combination with the above effect. Is something that can be done.

[Brief description of drawings]

FIG. 1 is a perspective view showing a one-tank laminated heat exchanger.

FIG. 2 is a perspective view showing a tube element.

FIG. 3 is a perspective view of a forming plate.

FIG. 4 is a cross-sectional view of the tube element except the vicinity of the U-turn portion.

FIG. 5 is a cross-sectional view near the U-turn portion of the tube element.

FIG. 6 is a cross-sectional comparison view showing a brazing state in the vicinity of the U-turn portion of the tube element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fin 2 Tube element 3 Fin 11 Pipe part 12 Molding plate 13 Brazing margin 14 Groove part 15 Partition walls 17a, 17b Drawing surface 18 U turn part 19 Fillet

Claims (1)

[Claims] 1. A heat exchanger in which heat is exchanged in a plurality of stages of tube elements and fins, which are molded by joining molding plates having groove portions formed on the inside of a brazing allowance on the periphery thereof. A heat exchanger characterized in that the throttle surface of the groove portion of the forming plate near the U-turn portion of the tube element through which the medium passes is formed so as to form a gentle angle with respect to the brazing allowance.