JPS59158992A - Heat exchanger - Google Patents

Abstract

PURPOSE:To prevent excess solder from being collected on the clamping teeth of a core plate, by providing an auxiliary tooth at least between the clamping teeth on the side of a core plate. CONSTITUTION:The core part of a heat exchanger is constituted of tubes 2, corrugated fins 3, core plates 4, and side plates 5. The core part 6 is heated in a vacuum furnace. Solder material being clad on the surfaces of core plates 4, side plates 5, and tubes 2 is melted by heat and each component part of 2, 3, and 4 is soldered. During heating excess solder drops downwards. But in case that an auxiliary tooth 4b is formed between clamping teeth 4a of a core plate 4, the amount of excess solder dropping to the clamping teeth 4a can be decrased, and the clamping teeth 4a can be soldered with uniform pressure being applied to the teeth in the soldering process.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchanger, and is effective for use as a radiator for automobiles, for example.

In recent years, radiators for automobiles have been made of aluminum to reduce weight. In this aluminum radiator, the core plate 1', tubes, fins, and side brakes 1' are brazed together, so there is a drawback that excess brazing material accumulates in the core plate 1'. That is, as shown in Figs. 1 and 2, the melted brazing material during brazing hangs downward due to gravity, causing the core plate 1
Drops accumulate on the bottom surface of -4. This surplus brazing filler metal 100 has a very negative effect on the subsequent tightening action of the core plates 1 and 4. According to experiments conducted by the present inventors, it has been found that this surplus brazing filler metal 100 appears particularly prominently in the inner portions of the core plates 1 and 4.

This is caused by the brazing filler metal dripping intensively on the surfaces of side plays 1 and 5, as shown in Figure 1, or by
This is because, as shown in FIG. 2, the core plates 1 and 4 are tilted and the brazing material on the surface of the core plate 4 drips.

The present invention was devised in view of the above points, and an object of the present invention is to prevent a large amount of excess brazing filler metal from accumulating in the locking claws of the core plate.

For this purpose, in the present invention, an auxiliary pawl is formed at least between the core plate 1 and the locking pawl on the side surface, and this auxiliary pawl reduces the flow of excess wax {4 to the locking pawl.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

In Fig. 3, numeral 1 denotes an upper tank which is made of nerflon resin reinforced with glass fibers.

The -L portion tank 1 is formed with an inlet pipe 1a for introducing cooling water from an automobile engine (not shown), an overflow vibe 1b, and a mounting hole 1c for attaching a radiator to the automobile. 2 is an aluminum-manganese-based aluminum alloy, and a brazing material of an aluminum-silicon-bismuth-based aluminum alloy is cradled on the surface.

Reference numeral 3 denotes a corrugated fin 1 which is thermally coupled to the tube 2 and is made of an aluminum-tin based aluminum alloy. The core plate 4 is made of an aluminum alloy of aluminum-copper-manufacturer type, and a brazing material made of aluminum alloy is cradled on the surface thereof. The tweed plate 5 is made of an aluminum-zinc-based aluminum alloy, and an aluminum brazing material is cradled on the surface.

A core portion 6 is formed by the tube 2, corrugated fins 3, core plate 4, and side plate 5. A lower tank 7 is connected to the lower core plate 4 and is made of nylon resin reinforced with glass fibers like the upper tank 1. Reference numeral 7a denotes an outflow vibrator integrally formed with this lower part 7, which allows the coolant cooled when passing through the core portion 6 to flow out to the engine side.

In particular, in the heat exchanger of this example, as shown in FIG.
Auxiliary claws 4b are formed between locking claws 4a formed on the sides of the core plate 4.

Here, the width p of the lateral side of the ablate 4 is 56 mm and 4M degrees, the width 1l of the locking claw 4a is about 10 mm, and the width l2 of the auxiliary claw 4b located at the corner is about 20 mm. The width 7!3 of the one located in the center is about 10 Ilm. Further, the gap between the locking claw 4a and the auxiliary claw 4b is about 2 to 3IIj.

Next, a procedure for assembling the above-described heat exchanger will be explained.

First, as shown in Figs. 5, 6, and 7, assemble the side plate 5 - Cono P gate fin 3 = tube 2 - corrugate fin 3 - corrugate fin 3 - side plays 1 and 5, Furthermore, core play is applied to both ends of Chico and Bu 2.
Press in 14.

In this state, the core part 6 is carried into a vacuum furnace using a brazing jig (not shown), and]. In a vacuum of about 10-” and 5
Heating is performed at a temperature of approximately 60"C. This heating melts the brazing filler metal cradled on the surfaces of the core plate 4, side plate 5, and tube 2, thereby forming each structure 2.3,
Brazing is performed for 4.5 minutes.

At this time, the excess brazing filler metal drips downward, but in this example the core plate
1 and 4, since the auxiliary pawl 4b is formed between the locking pawls 4a, the surplus brazing material does not flow intensively to the locking pawl 4a. That is, the excess brazing material flows in a dispersed manner to the locking claw 4a and the auxiliary claw 4b.

In particular, in this example, the auxiliary claws 4 are provided only on the sides of the core plate 4.
b, the locking pawl 4 on the side of the core plate 4
The effect of reducing excess brazing material appears only in a. Therefore, the following effects can be obtained.

Generally, not much surplus brazing material is generated on the front and rear surfaces of the core plate 4. On the other hand, on the sides, as shown in FIGS. 1 and 2, a large amount of surplus brazing filler metal is generated. Therefore, the amount of surplus brazing material that accumulates in the locking pawl 4a differs greatly between the side surface and the front and rear surfaces. On the other hand, if the auxiliary claws 4b are formed only on the side surfaces as in this example, the surplus brazing material on the locking claws 4a on the side surfaces is relatively reduced, and the surplus brazing material on the locking claws 4a on the side surfaces and the front and rear surfaces is relatively reduced. The amount of is relatively close.

Therefore, in the tightening process of the locking pawl 4a described below,
The locking pawl 4a can be tightened evenly over the entire circumference of the core plate 4.

After completing the molding of the core part 6 as described above, the rubber seal ring 8 is placed in the retaining groove 4C formed on the outer periphery of the core plate 1-4. The flange portions 9 of the upper tank 1 and the lower tank 7 are arranged on the side. (Illustrated in Figure 8) Next, lock the core plate 4. The claw 4a is tightened by a tightening jig (not shown), and the seal ring 8 is compressed by this tightening force. Therefore, at the end of the strangulation (J Zeel Ring 8 is m
There is a tight seal between the retaining groove 40 of the l-up plate 4 and the flange portions 9 of the upper tank 1 and lower tank 7 to keep the tongue/rl and 7 watertight.

In this example, as described above, since the locking force of the locking pawl 4a < zl is not uniformly applied over the entire circumference of the seal ring 8, the seal ring 8 is also compressed uniformly over the entire circumference, and this seal The sole effect of ring 8 is fully exhibited.

The -L heat exchanger is assembled by the above procedure.

It should be noted that although the above-mentioned embodiment is a preferred embodiment of the present invention, the present invention should not be limited to this example, and there are various other embodiments.

That is, as shown in FIG. 9, the length of the auxiliary claw 4b may be longer than the length of the locking claw 4a. This makes it easier for the extra brazing material to flow toward the auxiliary claw 4b.

Further, a lead groove may be formed in the plate 4 in order to guide the excess brazing material toward the auxiliary pawl 4b. In addition, in the example described above, the auxiliary claws 4b were formed only on the sides of the core plates 1 and 4, but if necessary, the auxiliary claws 4b may also be formed on the front and rear surfaces of the core plates 1 and 40. It's fine.

Further, although the heat exchanger of the present invention is used in a heat exchanger in the above-mentioned example, it may be used in other heat exchangers such as automobile heaters, oil coolers, etc.

As explained above, in the heat exchanger of the present invention, since the auxiliary pawls are integrally formed at least between the locking pawls formed on the sides of the core plate, excess brazing material flowing into the locking pawls during brazing is prevented. This has the excellent effect that the tightening process of the locking pawl can be performed with a uniform force.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view illustrating the state of the heat exchanger during brazing;
FIG. 2 is a front view illustrating the state of the heat exchanger during brazing, FIG. 3 is a front view showing an embodiment of the heat exchanger of the present invention, and FIG. 4 is the heat exchanger shown in FIG. 3. Fig. 5 is a front view showing the core part of the heat exchanger shown in Fig. 3, Part 6 is a side view of Fig. 5, and Fig. 7 is a sectional view of the main part of Fig. 5. , FIG. 8 is a sectional view taken along line 1--2 in FIG. 3, and FIG. 9 is a front view showing the main parts of another example of the heat exchanger of the present invention. 1..." Two-part tank, 2... Tube, 3... Corrugated fin, 4... Core plate, 4a...K
Retaining claw, 4b... Auxiliary claw, 5... Side plate, 7
...lower tank. 460

Claims (1)

[Claims] an aluminum tube through which a heat exchange fluid flows; an aluminum fin thermally coupled to the tube; an aluminum core plate coupled to both ends of the tube; and an outermost portion of the outermost fin. and an aluminum side plate disposed on the core plate. A locking pawl for tightening and fixing the tank is formed on the core plate 1, and a locking pawl formed at least on the side of the core plate 1. A heat exchanger with auxiliary claws formed between them.