JPS6039661Y2 - Automotive aluminum capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an aluminum condenser for an automotive air conditioner.

Recently, aluminum materials have been used for condensers used in automobile air conditioners such as car coolers in order to reduce their weight.

As shown in FIG. 1, this condenser is constructed by meandering and curving flat aluminum tubes 1 to form an overlapping section, with heat transfer fins 2 interposed between the tubes in this overlapping section. A core portion 3 is formed by mounting the core portion 3 , and both ends of the core portion 3 are supported and fixed by supports 4 and 5 .

As shown in FIG. 2, this support 4.5 is, for example, an iron member having a U-shaped cross section, and holds the tube 1 between its both side walls.

However, not only are the iron supports 4 and 5 heavy, but also the aluminum tube 1 is corroded by electrolytic corrosion due to the corrosion current.

However, since a refrigerant such as freon is flowing in the tube 1, even a slight pitting corrosion is unacceptable because the refrigerant leaks, and if this occurs, the entire condenser becomes unusable.

Therefore, to prevent this, s-t? -) A synthetic resin sheet 6 such as polyethylene terephthalate is interposed between 4.5 and the tube 1 to insulate it and prevent electrolytic corrosion.

However, this method not only increases the material cost but also has low assembly workability and is very expensive.

In order to improve such defects, as shown in Fig. 3, the support 4.5 is formed by a cladding material 9 of an aluminum material 8 clad with a brazing filler metal such as Al-3i alloy.
A method has been proposed in which this is integrally brazed as shown in FIG.

However, in the support 4.5 made of the rad material 9, the electric potential of the brazing material 7 in contact with the tube 1 is higher than that of the aluminum material forming the tube 1, so that the tube 1 is not electrolytically corroded. There was a drawback that

The present invention was developed to eliminate the drawbacks of the conventional products as described above, and consists of an aluminum tube and an aluminum support, both of which are integrally brazed with a brazing filler metal. This condenser for an automobile air conditioner is characterized in that the aluminum material constituting the support is a sacrificial anode material with a higher potential than the aluminum material constituting the tube.

Next, one embodiment of the present invention will be described with reference to the drawings.

That is, as shown in FIG. 1, the condenser for the automobile air conditioner according to the present invention has aluminum tubes 1 meanderingly curved to form an overlapping section, and corrugated fins are installed between the tubes 1 in this overlapping section. A core part 3 is formed by interposing heat transfer fins 2 such as plate fins, and both ends of this core part 3 are integrally brazed with supports 4 and 5 made of aluminum material, as shown in FIG. The support is solid.

The supports 4 and 5 are formed by using a clad material obtained by cladding the aluminum material 10 with a brazing material 7 (for example, an Al-3i alloy) because it is easy to assemble. Of course, it may be made of clad material and assembled by brazing.

Further, the tube 1 may be a flat tube as shown in FIG. 5, but it goes without saying that it may also be of circular cross section.

Therefore, the aluminum material 10 forming the supports 4 and 5 needs to be a sacrificial anode material with a higher potential than the aluminum material forming the tube 1.

In addition to industrial pure aluminum, the aluminum material forming the tube 1 may include aluminum alloys for wrought use, such as 1050.1100.3003.3203.4034.
There is an aluminum alloy of 5N02.6101.606.

On the other hand, as the aluminum material 10 forming the supports 4 and 5, any sacrificial anode material can be used as long as it has a higher potential than the aluminum material forming the tube 1, but it is particularly preferable that it contains 0.3% by weight or more of zinc. is 0.5 to 7% by weight,
The most preferred is an aluminum alloy containing 0.8 to 3% by weight, for example 7072.7075.7 NOI
, 7N11 materials, etc.

To manufacture a capacitor according to the invention, for example, 30
A flat tube 1 made of an aluminum alloy such as aluminum alloy is meanderingly curved to form an overlapping part, and aluminum is attached to both ends of the flat tube 1.
A support 4.5 having a U-shaped cross section is formed of an aluminum alloy containing 0.3% by weight or more of zinc (e.g. 707244) clad with -3i alloy or other brazing material, with the brazing material layer on the inside; After assembling using a jig or the like if necessary, it is supplied to a vacuum furnace and heated to a predetermined temperature to perform brazing.

The capacitor thus formed is used as a capacitor for car coolers, etc.

As mentioned above, in the automotive capacitor according to the present invention, the support is made of the aluminum material that serves as the sacrificial anode material, which has a higher potential than the aluminum material that forms the tube. A sacrificial electrode is formed in this part, which lowers the potential and generates an anti-corrosion current, so that even if the part of the support is corroded, the tube does not allow corrosion to occur at all. Corrosion resistance can be dramatically increased.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the present invention and a conventional automotive capacitor, and Figure 2 is a diagram of the conventional product.
Line sectional view, Figure 3 is a sectional view of aluminum clad material,
FIG. 4 is a sectional view of a conventional product similar to FIG. 2, and FIG. 5 is a sectional view of a capacitor according to the present invention at the same location as FIG. 2. 1...tube, 2...heat transfer fin,
4, 5... Support, 7... Brazing metal,
10...Aluminum material for support.

Claims (1)

[Scope of utility model registration request] In a condenser for an automobile air conditioner, which is composed of an aluminum tube and an aluminum support, both of which are brazed together with a brazing material, the aluminum material that makes up the support has zero
1. A capacitor containing zinc in an amount of 0% or more and using the aluminum material as a sacrificial anode material with a higher potential than the aluminum material constituting the tube.