JPS58178193A - Heat exchanger - Google Patents

Abstract

PURPOSE:To prevent water, mud and the like from finding their way into recesses and consequently clearance corrosion from producing by a structure wherein the recesses of the peripheral parts of header plates, at which a pair of tanks and cores are fixed by caulking, are covered by the plate fins of the cores in the solderless type heat exchanger. CONSTITUTION:The peripheral parts of the header plates 5 and 6, which are jointed by caulking with the opening end parts 3c and 4b of the tanks 3 and 4 of a vertical flow type radiator are bent in a U-shaped manner. The inside parts 5d and 6d of the peripheral parts are convexed toward inside of the tanks 3 and 4 and yet the caulked peripheries 5b and 6b of the header plates 5 and 6 and the parts 5d and 6d lying further inside than the peripheries 5b and 6b from the recesses 5e and 6e. The width of the outermost plate fins 2' adjoining to the header plate 5 and 6 is made larger than the width B of the recesses and the outermost plate fins 2' are brought into close contact with the caulked peripheries of the header plates 5 and 6. Accordingly, the recesses 5e and 6e are completely shut-off from outside, resulting in preventing water, mud and the like from finding their way into the recesses.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an 8o1derlθss type heat exchanger that can be assembled without soldering and is suitable for use as a radiator for automobiles, a hot water radiator for air conditioning, etc. . More specifically, there are a pair of tanks, a pair of header plates each having a circumferential edge hermetically caulked to the open end of the tank, and each end of the header plate corresponding to the inner side of the header plate. The present invention relates to a heat exchanger comprising a tube that penetrates through a portion of the tank and is hermetically connected to communicate the interiors of the pair of tanks with each other, and a plurality of plate fins disposed around the tube.

The above-mentioned type of heat exchanger is assembled by mechanical methods such as expanding the tubes and caulking the helder plates, so there is no soldering involved in the assembly process, improving the work environment and improving ease of assembly. In these respects, υ is also advantageous over those manufactured by soldering.

However, in the above-mentioned type of heat exchanger, in order to caulk and fix the header plate to the open end of the header, the peripheral edge of the header plate is shaped into a U-shape so as to protrude convexly from the inner part. In some cases, a method is adopted in which the open end of the tank is received inside the bent portion.

When this method is adopted, the back part of the U-shaped bend is the remaining part that remains in the center of the header plate, that is, the inner part of the caulking periphery (the tube is connected to this part). ) is recessed towards the inside of the tank. A recess is formed by the tab, the caulked peripheral edge of the header plate, and the inner portion thereof. If the plate fin is larger than this recess, a gap exists between the outermost plate fin adjacent to the header plate and the caulked peripheral edge of the header rudder plate, and the recess is inserted through the gap. communicates with the outside world.

When such a heat exchanger is used, for example, as a 2-radiator in a car, the heat exchanger will also be used under severe conditions because the car runs under various weather conditions.
During rainy weather, water and mud can sometimes enter the above-mentioned recesses and adhere to the surface of the tube, which is incomparable to the recesses. O enters into crevices and causes crevice corrosion. Therefore, the present invention aims to prevent such crevice corrosion.

To achieve this object, the present invention provides a heat exchanger of the type described above, in which the outermost plate in contact with at least one header plate is made wider so as to closely fit into the caulked peripheral edge of the one header plate. It is arranged in a state where it is placed.

With this configuration, the recess, that is, the space between the one header plate and the outermost plate fin, is connected from the outside by the plate fin on the outer side of the wrinkles, so that water can be removed. , the completion does not invade, and therefore,
Crevice corrosion is completely prevented.

Hereinafter, a detailed explanation will be given based on an illustrated embodiment in which the Kabuto-mei heat exchanger is applied to an automobile car diaator. In FIGS. 1 and 2, 1 is a tube made of light maple, such as aluminum, which is lightweight and has good heat conductivity, and 2 is a plate-shaped fin made of aluminum. A core portion 10 is formed that performs heat exchange between engine cooling water and cooling air. 3.4 is a pair of 4If oil tanks made of molded resin, for example, nylon resin containing glass fiber as a reinforcing material, and the upper inlet side tank 3 has an inlet vibrator 3a and a water injection hole 3b. The force is integrally molded. In addition, the exit side tank 4 at the bottom has an exit vibe 4aIll! is integrally molded. Reference numeral 5.6 denotes an aluminum header plate, each having collared holes 5a and 5a for fixing tubes. Note that aluminum is used as the material for the tube 1, plate fin/2, and header plate 5.6, but specifically A1
050. A3003. A3203 aluminum or 723 clad material in which the aluminum surface is clad with zinc is suitable.

The peripheral edge of the header plate 5.6, which is caulked to the open ends 3c and 4b of the tank 3.4, is bent into a U-shape, and the U-shaped bend is formed so that the back side of the header plate 5.6 is bent in a U-shape. The interior parts 5dl and 6d also protrude toward the core 10. In other words, the portion 5d+ of the header plate 5.6
6a is recessed inward at an angle of 3°4 (header play), and recesses 5e and 6e are formed by the caulked peripheral portions 5b and 5b of 5.6 and the inner portions 5d and $a of the mouth. The width A of the plate fins 2 other than the outermost plate fins 2' and 2' adjacent to the header plate 5.6 is also smaller than the width B of the recesses 5e and 6e, but The outer plate fins 212' are made wider than the recess width B and are disposed in close contact with the caulked peripheral edges of the header plates 5 and 6. As a result, since the recesses 5e and 5e are completely isolated from the outside, water, dirt, etc. are prevented from entering into the recesses 5e and 6e, and thus the above-mentioned bottle corrosion occurs. is completely prevented.

Next, to explain how to assemble the solderless heat exchanger with the above configuration, first, one header plate (for example, 6) is assembled.
On top of this, one wide plate fin 2' pre-formed to a predetermined shape and predetermined dimensions is stacked, and on top of that, a predetermined number of plate fins 2 pre-formed to a predetermined shape and predetermined dimensions are stacked. Stack another wide plate fin 2' on top of it, stack another header plate 5 on top of it, and then insert the aluminum tube 1 into the collared hole 2a of the plate fin 2.2'. and collared holes 5a, 6a of header plate 5.6
Then, by expanding the tube 1 in the radial direction, the tube 1 is fin 2. form 10. Note that a rod-shaped tube expansion jig is used to expand the tube 1, but since the point of tube expansion is not important for understanding the present invention, a description thereof will be omitted. Next, the both ends 1aw1b of the expanded tube 1 and the force 2-attached holes 5a, 5a of the header plate 5.6 are bonded using a thermosetting epoxy or polyester resin adhesive 8. Then, seal the expansion fixing part of tube 1. Thereafter, the peripheral edges 5b, 5 of the header plate 5.6
An elastic sealing material 11 is interposed between the opening ends 3c, 4b of the tanks 3, 4, and the tip protrusions 5c, 5cfl'7 of the peripheral edges 5b, 5b are connected to the ends 3c, 4b. As shown in FIG. 2 above, the header plates 5, 6 and the tanks 3, 4 are joined together watertightly. At this point, the assembly of the heat exchanger shown in the first diagram can be completed.

In addition, in the *example mentioned above, the upper and lower header plates 5.
Both recesses 5e and 6e in 6 are shielded from the outside by wide plate fins 2' and 2'; Only the recess 6e may be covered with a wide plate fin 2'.

Nine, the above illustrated embodiment describes a vertical flow radiator in which cooling water flows in the vertical direction.
The present invention can be similarly applied to a radiator of a set of crosses 70 in which cooling water flows horizontally (left and right).

FIG. 6 is a book showing the structure of a conventional Q heat exchanger in which all plate fins 2 have the same -A, so it is clear from the figure that the width B of the recess 6e in the header plate 6 corresponds to which plate fin. 2 is also larger than the width A, there is a gap C between the caulked peripheral edge of the header plate 6 and the outermost plate fin that contacts this header rudder plate 6. water, mud, etc. in the recess 6
It is easy to invade e. When compared with this, it is clear that the effect of the present invention is great.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view of a vertical flow complete radiator embodying the present invention, Fig. 2 is an enlarged sectional view taken along line nn in Fig. 1, and Fig. 6 is a view similar to Fig. 2. However, this shows the structure of a conventional two-diode. 1...Tube, 2...Plate 7 (7,3*
4...Tank, 5.6...Header plate, 5b
16b... header plate caulking peripheral edge, 5e+
6e... recess (space), 2'... outermost wide plate fin. Oh Cao Tu

Claims (1)

[Claims] A pair of tanks, a pair of header plates each having a peripheral edge hermetically caulked to the open end of the tank, each end of which penetrates through the inner part of the corresponding peripheral edge of the header plate. In the heat exchanger, the heat exchanger includes tubes that are hermetically coupled to communicate the interiors of the pair of tanks with each other, and nine plate fins disposed around the tubes, at least one of the ladder plates. The nine outermost plate fins adjacent to the header plate are wide and are arranged in close contact with the caulked peripheral edge of the one header plate and the outermost plate. A heat exchange can characterized by shielding the space between it and the fins from the outside.