JPH0368773B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for manufacturing a heat exchanger used in automobile radiators, heaters for heating devices, and the like.

Conventional technology and its problems Conventionally, two header plates are parallel to each other, and the two header plates are arranged at right angles to the header plate and parallel to each other, and both ends are joined to the header plate. a plurality of flat tubes, corrugated fins arranged between adjacent flat tubes and outside the flat tubes at both ends and joined to the flat tubes; A heat exchanger used as an automobile radiator or a heater for heating equipment, consisting of a side plate joined to a corrugated fin and a header tank body that is fixed to a header plate and forms a header tank together with the header plate. The vessels were manufactured in the following manner. That is, first, flat tubes and corrugated fins are arranged alternately, corrugated fins are placed on the outside of the flat tubes located at both ends, side plates are placed on the outside of these corrugated fins, and then each flat tube is placed on the outside of the flat tube. Insert both ends of the tube into the holes drilled in the header plate and fix them with a jig to assemble the flat tube and corrugated fins, the corrugated fins and side plate, the header plate and side plate, and the flat tube. After vacuum-brazing the tube and header plate together, the header tank body was fixed to the header plate.

However, the conventional method involves arranging the flat tubes and corrugated fins alternately and temporarily fixing them with a jig, and inserting both ends of each flat tube into holes drilled in the header plate to connect the header plate and the flat tubes. It is necessary to temporarily fix the parts with a jig and to remove the jig after brazing them, which increases the number of man-hours and makes the work troublesome. In addition, care had to be taken in handling the flat tube and corrugated fins so that they would not shift when they were moved into a brazing furnace after being temporarily fixed with a jig. In addition, the surface of the jig becomes rough during brazing and requires polishing after several uses, leading to severe wear and tear on the jig, resulting in an increase in cost. Furthermore, since the jig is naturally heated during brazing, the amount of heat required for brazing increases, causing the problem of increased fuel costs for the furnace.

An object of the present invention is to provide a method for manufacturing a heat exchanger that solves the above problems.

Means for Solving the Problems The method for manufacturing a heat exchanger according to the present invention includes at least two header plates that are parallel to each other, and a space between the two header plates that is at right angles to the header plates and parallel to each other. A heat pump comprising a plurality of flat tubes arranged in the same direction, corrugated fins arranged between adjacent flat tubes, and a header tank body fixed to the header plate and forming a header tank together with the header plate. A method for manufacturing an exchanger, in which flat tubes are formed with a brazing sheet, and both ends of a plurality of flat tubes are mechanically temporarily fixed to a header plate in advance, and the header plate and flat tubes are combined. The corrugated fins are forcibly fitted between the adjacent flat tubes of this combination body and temporarily fixed to the combination body, and then the flat tubes and the header plate, and the flat tubes and the corrugate fins are At the same time, the header tank body is fixed to the header plate.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the term aluminum includes all aluminum alloys in addition to pure aluminum.

1 to 4 show a heat exchanger for a motor vehicle radiator manufactured by the method according to the invention. In Figures 1 to 4, heat exchanger 1
consists of two aluminum header plates 2 arranged vertically at a predetermined interval and parallel to each other.
and a plurality of flat tubes 3 made of aluminum brazing sheets, which are arranged between both header plates 2 at right angles to the header plate 2 and parallel to each other, and whose both ends are brazed to the header plate 2. , aluminum corrugated fins 4 with louvers arranged between adjacent flat tubes 3 and on the outside of the flat tubes 3 at both ends and brazed to the flat tubes 3; and header plate 2
and a side plate 5 made of aluminum brazing sheet brazed to the corrugated fin 4, and a plastic header tank body 7 fixed to the header plate 2 and forming a header tank 6 together with the header plate 2. Become. A flange 7a provided at the periphery of the opening of the header tank body 7 is provided on the periphery of the surface of both header plates 2 to which the header tank body 7 is attached.
A recessed groove 8 into which the holder is fitted is provided around the entire circumference. The groove 8 is formed so as to protrude toward the other header plate 2 side. The other protruding portions toward the header plate 2 form engagement protrusions 10 that engage with both ends of the side plate 5, as will be described later. The header plate 2 also has flat tube insertion holes 9 that are long in the width direction of the header plate 2 at predetermined intervals in the length direction.
are formed. A flange 11 is provided at the periphery of the flat tube insertion hole 9 on the surface of the header plate 2 on which the header tank body 7 is attached.
is formed. Both ends of the flat tube 3 are expanded to form expanded tube portions 3a, and with the expanded tube portions 3a inserted into the holes 9 and in close contact with the inner peripheral surface of the flange 11, the header plate 2 and the flat tube are connected. 3 is brazed. Also, header plate 2
On the surface facing the other header plate 2, the space between the periphery of the flat tube 3 and the hole 9 is sealed with a sealing material 12 such as epoxy resin. Both upper and lower ends of the side plate 5 are once bent diagonally outward and then bent toward the flat tubes 3 located at both left and right ends, and the ends thereof are folded back to the outside to provide elastic engagement portions 13. It is being The side plate 5 has a header at the tip of the engaging portion 13.
It is joined to the header plate 2 while being engaged with the protrusion 10 of the plate 2. The flange 7a of the header tank body 7 is inserted into the groove 8 via the O-ring 14, and the flange 7a is inserted into the header tank body 7.
The header is pressed by the flange holding protrusions 15 formed on the outer wall of the groove 8 located on the long side of the plate 2 so as to protrude inward at a predetermined interval in the length direction. It is fixed to plate 2. The flange holding protrusion 15 has a substantially semicircular shape when viewed from the plane or the bottom, and the edge on the bottom wall side of the groove 8 is cut away from the other part of the outer wall of the groove 8. Flange 7a at this edge
is being held down.

Next, a method for manufacturing the heat exchanger 1 will be described with reference to FIGS. 5 to 12.

First, as shown in FIGS. 5 and 6, a plurality of grooves 16 into which the flat tubes 3 are tightly fitted are inserted into the heat exchanger 1.
A flat tube holder 17 formed at the same pitch as the adjacent flat tube 3 of the product is prepared, and both ends thereof are inserted into the grooves 16 by a feeding device (not shown).
The flat tube 3 is fitted in the state in which it protrudes from. It is preferable that the grooves 16 of the holder 17 be formed in a larger number. After fitting the flat tubes 3 into the grooves 16 of the flat tube holder 17, both ends of the flat tubes 3 are expanded using the tube expanding device 26 to form expanded tube portions 3a (see FIG. 7). The tube expansion device 26 is connected to the flat tube holder 1
A plurality of slides 27 are installed on the surface of the slide 27 on the flat tube holder 17 side so as to correspond to the flat tubes 3, and the slides 27 are located on both sides of the flat tube holder 17 and can freely move toward and away from the flat tube holder 17. It consists of a tube expansion member 28 that is inserted into the end portion and expands this portion. The tip of the tube expanding member 28 is tapered. Then, this tube expanding member 28 is inserted into both ends of the flat tube 3 to expand this portion, thereby creating a tube expanded portion 3a.

Next, the expanded tube portions 3a at both ends of each flat tube 3 are respectively inserted into the flat tube insertion holes 9 of the header plate 2, and the expanded tube portions 3a and the flange 11 are brought into close contact (see FIG. 8). If both ends of the flat tube 3 are expanded in advance, when the expanded tube portion 3a is inserted into the hole 9, a force is applied to the flange 11 to expand it, and a force is applied to the expanded tube portion 3a to contract it. As forces are applied, the reaction of these forces brings them into close contact. Thereafter, the header plate 2 and the flat tube 3 are temporarily fixed by a mechanical method such as caulking, thereby creating a combination 32 consisting of the header plate 2 and the flat tube 3 (see FIG. 9).

After making the combination 32 as described above,
Corrugated fins 4 are forcibly fitted between adjacent flat tubes 3 in the combination 32 (see FIG. 10), and corrugated fins are fitted along the outsides of the flat tubes 3 at both ends.・
When the fins 4 are arranged, each flat tube 3 bends slightly, so that the middle part of the length of the flat tube 3 located at both ends bends outward, and the corrugated fins 4 at the outer ends bend outward. curved to Next, the side plate 5 is pushed in from the outside of the corrugated fin 4 at the outer end in the direction shown by the arrow in FIG. At this time, the engaging part 13 is once bent (see the solid line in FIG. 11), and then restored by its own elastic force, and the engaging part 13 and the protruding part 10 are firmly engaged (see the two-dot chain line in FIG. 11). ). In the engaged state, each flat tube 3 and the corrugated fins 4 arranged on the outside of the flat tube 3 at both ends are deformed from the state before engagement, and the side plate 5 is moved outward due to the spring back. is being pushed. Therefore, the engaging portion 13 of the side plate 5 is firmly engaged with the protruding portion 10 of the header plate 2, and the side plate 5 is prevented from coming off. The corrugated fins 4 located outside the flat tube 3 at the end are prevented from falling off.

Then, the combination body 32 and the corrugated fin 4
With the side plate 5 set as described above, the flat tube 3 and the corrugated fin 4, the header plate 2 and the side plate 5, and the corrugated fin 4 and the side plate are assembled without using a jig. 5 and 5 are simultaneously brazed using a vacuum brazing method. After brazing is finished,
A sealing material 12 made of epoxy resin or the like is applied to the joint between the flat tube 3 and the header plate 2 and dried.

Finally, the flange 7a of the header tank body 7
into the groove 8 of the header plate 2 through the O-ring 14, and then attach the main body 7 to the header plate 2.
The header tank body 7 is attached to the header plate 2 by forming a protrusion 15 on the outer wall located on the long side of the header plate 2 by a fixing device 41 having a plurality of punches 40 while being pressed to the side. It is fixed to form a header tank 6 (see FIG. 12).

In this way, the heat exchanger 1 is manufactured.

In the above embodiment, the flat tubes 3 are arranged in one row in the width direction of the header plate 2, that is, in the air flow direction, but they may be arranged in two or more rows.

Further, in the above embodiment, the flat tube holder 1
7 is a single plate with a groove 16 formed on its upper surface, but instead of this, it is made up of a pair of rod-shaped bodies parallel to each other, with grooves formed on the upper surface of the rod-shaped body. You may also use In this case, if the distance between the two rod-like bodies is adjustable, it is possible to apply the present invention even if the lengths of the flat tubes are different.

Furthermore, in the above embodiment, the combination 32
After forming the adjacent flat tubes 3 of the combination body 32
The corrugated fins 4 are forcibly fitted between them, and the corrugated fins 4 are placed on the outside of the flat tube 3 located at both ends, and then the engaging portions 13 at both ends of the side plate 5 are fitted into both headers. - The corrugated fins 4 located on the outside of the flat tube 3 at both ends are engaged with the protrusions 10 of the plate 2 to prevent them from falling off, so it is time to move them into the brazing furnace. There is no need for a jig to fix the flat tube, corrugated fin, and side plate during installation, and the same problems as those of the conventional method described above that occur when using a jig can be solved at once. .

Effects of the Invention In the method according to the present invention, both ends of a plurality of flat tubes are mechanically temporarily fixed to a header plate to create a combination of a header plate and a flat tube, and adjacent flat tubes of this combination are Since the corrugated fins are forcibly fitted between the pipes to temporarily secure them, there is no need to use a jig to braze them together. Therefore, as in the conventional method, the work of arranging flat tubes and corrugated fins alternately, inserting both ends of the flat tubes into holes formed in the header plate, and temporarily fixing them with a jig is necessary. , and the work of removing the jig after brazing the header plate, flat tube, and corrugated fin becomes unnecessary, reducing the number of man-hours and simplifying the work. Moreover, there is no risk of the flat tube and corrugated fins being displaced when they are moved into a brazing furnace, unlike when they are fixed with a jig. Furthermore, since there is no need to use a jig, the cost is reduced. Furthermore, during brazing, there is no need to heat the jig as in the conventional method, so the amount of heat required for brazing is small, and the fuel cost for the furnace is reduced. Furthermore, since the flat tube is formed of a brazing sheet, this can be used to braze the header plate and the flat tube, and the flat tube and the corrugated fin.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a heat exchanger manufactured by the method of the present invention, Fig. 2 is an enlarged partially cutaway view of Fig. 1, and Fig. 3 is a part taken along the - line in Fig. 1. 4 is a partial enlarged view of FIG. 3, FIGS. 5 to 12 show the method of the present invention in the order of steps, and FIG. 5 shows a flat tube placed in a flat tube holder. Fig. 6 is a side view showing how to place the flat tube in the flat tube holder, Fig. 7 is a partially cutaway plan view showing how to expand both ends of the flat tube, and Fig. 8 is a side view showing how to arrange the flat tube in the flat tube holder. A partially cutaway plan view showing both ends of the tube inserted into the holes in the header plate, Figure 9 is a perspective view of the combination of the header plate and flat tube, and Figure 10 shows the adjacent combination. Fig. 11 is a partially cutaway side view showing a method of forcibly fitting corrugated fins between flat tubes, and Fig. 11 is a partially cutaway plan view showing a method of engaging both ends of a side plate with a header plate. 12 are partially cutaway front views showing a method of fixing the header tank body to the header plate. 1... Heat exchanger, 2... Header plate, 3
...Flat tube, 4...Corrugated fin, 6...
Head tank, 7... Head tank body, 3
2...A combination of a header plate and a flat tube.

Claims (1)

[Claims] 1. At least two header plates parallel to each other, a plurality of flat tubes arranged between the header plates at right angles to the header plates and parallel to each other, and adjacent flat tubes. A method for manufacturing a heat exchanger comprising corrugated fins arranged between tubes and a header tank body fixed to a header plate and forming a header tank together with the header plate, the method comprising flat tubes. are formed of a brazing sheet, and the ends of a plurality of flat tubes are mechanically temporarily fixed to a header plate in advance to create a combination of header plates and flat tubes, and adjacent parts of this combination are The corrugated fins are forcibly fitted between the flat tubes and temporarily fixed to the assembled body, then the flat tubes and the header plate are brazed together, and the flat tubes and the corrugated fins are simultaneously brazed, and then the header is fitted onto the header plate. - A method for manufacturing a heat exchanger, which consists of fixing a tank body.