JPH09318292A - Pipe joint for tank made of metal for heat-exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform high-precise joining by a method wherein a protrusion piece formed on the base edge of the base end part of a pipe is brought into abutment against a part of a seat plate to form a two-pot support structure. SOLUTION: A pipe 13 is formed in a cylindrical shape by using a cladding material formed such that a brazing material is laminated on one surface of a core made of an aluminum alloy, and a pair of axially protruding protrusion pieces 18 and 18 are formed on a base edge 17 of a base end part 14 thereof. When the pipe 13 is assembled at a tank 2, the base end part 14 is inserted in a through-hole 12 of a tank body 7 and the tip ends of the protrusion pieces 18 and 18 are brought into abutment against a part of a seat plate 6 and a part deviated from connection holes 8 and 8 and positioning thereof and perpendicularity is held. Thereafter, simultaneously with brazing of the core part of a heater core, contact parts are brazed together and joined together for integral formation. This constitution ensures and facilitates holding and positioning of the pipe 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal tank for a heat exchanger, which constitutes a heat exchanger used as a heater core or the like incorporated in an air conditioner of an automobile or the like, and also to the inside of the metal tank. The present invention relates to a joint with a pipe for supplying and discharging hot water.

[0002]

2. Description of the Related Art A conventionally known heat exchanger used as a heater core of an air conditioner for an automobile or the like is shown in FIGS.
Are described. This heat exchanger 1
Each of the constituent members made of aluminum alloy is combined and integrally joined by brazing. That is, as shown in FIG. 5, a pair of aluminum alloy tanks 2 and 2 arranged parallel to each other are provided, and between the tanks 2 and 2, a plurality of flat heat transfer tubes 3 and 3 and a corrugated tube are provided. The mold fins 4 and 4 are alternately arranged to form the core portion 5. Both ends of these heat transfer tubes 3 and 3 (upper and lower ends in FIG. 5)
Respectively liquid-tightly penetrate the pair of tanks 2 and 2,
The respective inner passages communicate with the insides of these tanks 2, 2. The tanks 2 and 2, the heat transfer tubes 3 and 3, and the pipes 13 and 13 described later are made of a so-called clad material in which a brazing material is laminated on at least one surface of a core material made of an aluminum alloy.

Each of the tanks 2 is formed by combining a seat plate 6 and a tank body 7 having a substantially boat shape in the middle. The seat plate 6 is formed with connection holes 8 having a shape and a size such that the end portions of the heat transfer tubes 3 and 3 can be inserted with almost no space therebetween. Also, of the pair of tanks 2 and 2, one of the tanks 2 (the upper side in FIG. 5) is
Is provided with a partition plate 9 at the inner middle portion thereof, and the inside of the tank 2 is divided into an inlet chamber 10 and an outlet chamber 11. Then, on the upper surface of the tank body 7 of the tank 2,
Through holes 12 and 12 are formed at positions corresponding to 0 and the outlet chamber 11. And the base end parts 14 and 14 of the pipes 13 and 13 are joined to these through holes 12 and 12, respectively.

In the heat exchanger 1 configured as described above, the abutting portions of the constituent members are brazed to integrally join the constituent members. That is, tanks 2, 2,
Heat transfer tubes 3, 3, fins 4, 4, partition plate 9, pipe 13,
13 is assembled as shown in FIG. 5, and is put into the heating furnace while being held down by a jig (not shown). Then, in this heating furnace, the temperature is higher than the melting point of the brazing material and lower than the melting point of the base material (aluminum alloy that serves as a core material of each component member to maintain strength) (for example, about 600 ° C.). To do. By this heating, the heat transfer tubes 3 and 3 made of the fins 4 and 4 and the clad material, the seat plates 6 and 6, the tank body 7,
7. The brazing material existing on the surface of the partition plate 9 is melted, and the above-mentioned members are brazed and joined.

The operation when the heat exchanger 1 configured as described above is used as a heater core is as follows.
Hot water is sent from a pipe (not shown) to the inlet chamber 10 of the one tank 2 via a pipe 13 (on the left side in FIG. 5) communicating with the inlet chamber 10 side. This warm water is used in the entrance chamber 10.
Pass through the heat transfer tubes 3 and 3 connected to the other side, and the other tank 2
To the side of the outlet chamber 11 and further passes through the heat transfer tubes 3 connected to the side of the outlet chamber 11 to reach the outlet chamber 11. And
The other pipe 13 communicating with the outlet chamber 11 side is taken out to the outside through a pipe (not shown). As a result, the temperature of the core portion 5 rises. Therefore, if air is flowed between the heat transfer tubes 3 and 3 and the fins 4 and 4 that form the core portion 5, the air can be heated and the room can be heated. .

[0006]

However, in the case of the conventional heat exchanger configured as described above, the tank 2 and the pipe 1 are
The joint with 3 may be either the hot water supply side or the hot water discharge side, and as shown in FIG. 7, the base end 14 of the pipe 13 is formed in the tank 2 through hole 12. It was just inserted into and was brazed to its abutting part. That is, the through hole 1
2 is a mere punched hole. Further, the pipe 13 has a bead 15 at the base end portion 14, but is formed in a substantially cylindrical shape. Therefore, the position of the pipe 13 is held only at one position by the thickness of the inner peripheral edge of the through hole 12, and it is not always sufficient in terms of holding the verticality of the pipe 13 with respect to the tank body 7 and joining strength. Absent. Particularly, when brazing these constituent members, since these members are heated to about 600 ° C. as described above, it is extremely difficult to maintain their positions. The bead 15 also has a function as a stopper for positioning the pipe 13 in the insertion direction.

In order to solve the above-mentioned inconvenience, for example, measures such as increasing the material thickness of the tank body 7 and widening the contact area with the pipe 13 can be considered. However, there is a limit in terms of workability, weight, cost, etc. of the tank 2, and this is not a sufficient measure. The pipe joint portion of the metal tank for a heat exchanger according to the present invention has the above-mentioned structure in which the projecting piece formed on the base end edge of the base end portion of the pipe is abutted against a part of the seat plate to form a two-point support structure. It is intended to eliminate such inconvenience.

[0008]

The pipe joint portion of the metal tank for heat exchanger of the present invention has the end portions of a plurality of heat transfer tubes, like the pipe joint portion of the conventional metal tank for heat exchanger described above. A seat plate having a plurality of connection holes for connection, a tank body that is combined with the seat plate to form a hollow tank, and a passage formed in a portion of the tank body that faces the seat plate. A hole and a pipe whose base end is connected to the through hole portion are provided. Particularly, in the pipe joint portion of the metal tank for heat exchanger of the present invention, the projecting piece projecting in the axial direction is formed at the base end edge of the pipe. The tip edge of the projecting piece hits a portion of the seat plate that is out of the connection hole in a state where the base end portion of the pipe is fitted in the through hole, and positions the pipe with respect to the tank. Try.

[0009]

In the pipe joining portion of the metal tank for a heat exchanger of the present invention constructed as described above, the pipe inserted into the through hole of the tank body and joined is within the through hole of the tank body. It is supported by two portions, the peripheral portion and the seat plate. Therefore, the verticality of the pipe can be maintained and the joint strength can be increased.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Next, FIGS.
Each shows the 1st, 2nd example of embodiment of this invention. In each of the illustrated examples, the same parts as those of the above-described conventional structure are designated by the same reference numerals, and duplicated illustration and description will be omitted or simplified. First, in the case of the first example of the embodiment of the present invention shown in FIGS. 1 and 2, the tank 2 constituting the heat exchanger is a clad material in which a brazing material is laminated on at least one surface of a core material made of an aluminum alloy. The seat plate 6 and the tank body 7 formed by the above are combined in the middle. At the bottom of the seat plate 6 among these, the heat transfer tubes 3,
Connection holes 8 for inserting the end portions of 3 are formed.
Although the bottom surface of the seat plate 6 shown in FIG. 1 has a wavy shape,
The corrugated shape is generated by the burring process for forming the connection holes 8, 8. On the other hand, on the upper surface of the tank body 7, a through hole 12 for inserting a pipe 13 described below is formed at a position corresponding to the inlet chamber 10 (and outlet chamber 11) side. In the case of this example, the through hole 12
Since it is formed by burring, a bent portion 16 formed by squeezing is formed on the inner peripheral edge thereof. The pipe 13 can be inserted inside the through hole 12 without any gap.

The pipe 13 is similar to the tank 2 in that
At least the base end side (Fig. 1-Fig. 1) by the clad material in which the brazing material is laminated on at least one surface of the aluminum alloy core material.
2) is formed into a cylindrical shape, and a base end portion 14 thereof is formed.
A pair of projecting pieces 18, 18 projecting in the axial direction (vertical direction in FIGS. 1 and 2) is formed on the base end edge 17 of the. Then, at the respective tip edges (lower end edges in FIGS. 1 and 2) of the projecting pieces 18, 18, a taper surface 19 whose inner surface substantially coincides with the slope of the wavy portion formed on the bottom surface of the seat plate 6, 19 is formed. Further, the intervals between the projecting pieces 18, 18 are such that, when the pipe 13 is assembled to the tank 2, the tip edges of the projecting pieces 18, 18 are the bottom surface of the seat plate 17 and the connection holes 8, 8 are formed. Is regulated to have a size that abuts against the disengaged part (part disengaged from the joint end of the heat transfer tube 3).

When the pipe 13 formed as described above is assembled to the tank 2, the base end portion 14 is inserted into the through hole 12 of the tank body 7, and the tip edges of the projecting pieces 18, 18 are attached to the seat plate 6. A part of the contact hole is abutted against the connection hole 8 and a portion separated from the contact hole 8, and its positioning and verticality holding are performed (positioning is performed). In this way, the pipe 13 assembled to the tank 2 is integrated by brazing the heater core portion 5 and at the same time brazing the abutting portions thereof. Since the pipe joint portion of the present invention is configured as described above, the pipe 13 can be held and positioned reliably and easily. Further, in the case of this example, since the bent portion 16 is formed in the inner peripheral edge of the through hole 20 of the tank body 7, the pipe 13 can be held more reliably and firmly.

Next, FIGS. 3 to 4 show a second example of the embodiment of the present invention. Like the pipe 13 in the first example, the pipe 13 in this example has a pair of projecting pieces 18, 1 projecting in the axial direction of the base end edge 17 (vertical direction in FIGS. 3 to 4).
8 Particularly, in the case of this example, these protrusions 18,
The flank surface 2 that substantially matches the slope of the wavy portion formed on the bottom surface of the seat plate 6 at the leading edge of 18 (the lower edge of FIGS. 3 to 4).
0 and 20 are formed.

The pipe 13 in this example formed as described above is displaced by 90 ° in the circumferential direction with respect to the assembled state of the pipe 13 in the above-mentioned first example, that is, 1
The pair of projecting pieces 18, 18 are assembled to the tank 2 in a state where they are located in the same valley portion of the corrugated portion of the seat plate 17. Then, the abutting portions of each other are brazed and integrally joined.
In the case of this example, the flanks 20 and 2 are provided on the tip edges of the protruding pieces 18 and 18.
By forming 0, the joint strength to the seat plate 6 is improved. Moreover, since the space between the protrusions 18, 18 is open in the width direction of the heat transfer tubes 3, 3 (the front and back directions in FIG. 3), the protrusions 18, 18 prevent the hot water or the like from flowing. There is no obstruction to the fluid flow. Other configurations and actions are similar to those in the case of the first example described above.

In each of the above-mentioned examples, the bent portion 16 is formed on the inner peripheral edge of the through hole 12 (in the case of the first and second examples), and the tip surfaces of the projecting pieces 18, 18 are tapered surfaces. 19,
By forming 19 (in the case of the first example) or flanks 20 and 20 (in the case of the second example), the contact area of the pipe joint is increased. The present invention is not limited to such an example, and as is apparent from the above description, the pipe 13
Since it is supported at two points, the bent portion 1
6, the taper surface 19 and the flank surface 20 can be omitted.
Further, in each of the above-described examples, the joint portion of the pipe 13 provided on the inlet chamber 10 side portion has been described.
It goes without saying that the same can be applied to the joint portion of the pipe 13 provided on the first side.

[0016]

EFFECTS OF THE INVENTION Since the pipe joint portion of the metal tank for heat exchanger of the present invention is constructed and operates as described above, it becomes easy and reliable to assemble the pipe to the tank and hold the position (positioning), and accurately. Can be joined. Therefore, the pipe mounting accuracy is improved, the joint strength between them is increased, and the strength of the pipe itself is also increased. Furthermore, with the increase in the above-mentioned joining strength and the strength of the pipe itself,
The tank itself can be made thin to reduce its weight.

[Brief description of drawings]

FIG. 1A in FIG. 5 shows a first example of an embodiment of the present invention.
Sectional drawing corresponding to a part.

FIG. 2 is a perspective view of an end portion of the same pipe.

FIG. 3 is a sectional view similar to FIG. 1, showing a second example of the embodiment of the present invention.

FIG. 4 is a perspective view of the end of the pipe.

FIG. 5 is a schematic sectional view showing a conventional heat exchanger.

FIG. 6 is a sectional view taken along line BB of FIG. 5;

7 is a partial cross-sectional view of a portion A of FIG. 5 showing a pipe joint portion.

[Explanation of symbols]

 1 Heat Exchanger 2 Metal Tank 3 Heat Transfer Tube 4 Fin 5 Core Part 6 Seat Plate 7 Tank Body 8 Connection Hole 9 Partition Plate 10 Inlet Chamber 11 Outlet Chamber 12 Through Hole 13 Pipe 14 Base End 15 Bead 16 Bent 17 Proximal edge 18 Projection piece 19 Tapered surface 20 Flank surface

Claims (1)

[Claims] 1. A seat plate having a plurality of connection holes for connecting end portions of a plurality of heat transfer tubes, a tank main body which is combined with the seat plate to form a hollow tank, and a part of the tank main body. In a pipe joint part of a metal tank for a heat exchanger, which has a through hole formed in a portion facing the seat plate and a pipe having a base end portion joined to the through hole portion, A projecting piece projecting in the axial direction is formed at the base end edge of, and the tip end edge of this projecting piece is a part of the seat plate when the base end portion of this pipe is fitted in the through hole. A pipe joining part of a metal tank for a heat exchanger, characterized in that the pipe is positioned with respect to the tank by hitting a portion separated from the connection hole.