JPS62129694A - Aluminum-made heat exchanger - Google Patents

Abstract

PURPOSE:To be able to provide an aluminu-made heat exchanger with no foul odor by forming synthetic resin-made anticorrosive film with deodorant or a hydrophilic film with deodorant on the surface of fins. CONSTITUTION:On the surfaces of fins 3, a composite film which is composed of a synthetic resin-made anticorrosive film 9 and a hydrophilic film 8 formed on its surface and has deodorant 7 at lest in one film of the two, the film 9 with deodorant, or the film 8 with deodorant is formed. As deodorant, chemical deodorant and oxygen deodorant are utilized. As the chemical deodorant, there are ferrous sulfate, ferric sulfate, ferric hydrochloric acid, sodium percarbonate, Glauber's salt-hydrogen peroxide-salt complex, hydrogen peroxide, sodium persulfate-ferric sulfuric acid, potassium peroxide, peroxide of alkaline earth metal, cummen hydroperoxide, and benzoyl peroxide. AS the oxygen deodorant, there are cellulase, amylase, protease, alkali proase, and lipase.

Description

[Detailed description of the invention] Industrial applications This invention relates to an aluminum heat exchanger.

Conventional technology and its problems The fins of aluminum heat exchangers used in room coolers, etc. are coated with a synthetic resin corrosion-resistant coating to provide corrosion resistance, and a hydrophilic coating to provide hydrophilicity. Both a corrosion-resistant film and a hydrophilic film may be formed to impart hydrophilic properties.

However, when such a film is formed on the fin, there is a problem in that the film generates an unpleasant odor.

The object of the present invention is to provide an aluminum heat exchanger that does not have the unpleasant odor caused by the film described above.

Means for Solving the Problems The aluminum heat exchanger according to the present invention comprises a synthetic resin corrosion-resistant film and a hydrophilic film formed on the surface of the fins, and at least one of the films contains a deodorizing agent. It is characterized by the formation of a composite film, a synthetic resin corrosion-resistant film containing a deodorizing agent, or a hydrophilic film containing a deodorizing agent.

Examples of hydrophilic coatings include coatings based on alkali silicate (water glass) and coatings made of porous materials such as silica and polymers. Alkali silicic acid J
To form an n-based coating on a fin, an aqueous solution of an alkali silicate is applied to the surface of the fin, and the aqueous solution of an alkali silicate is cured with, for example, phosphate, glyoxal, or the like. To form a film made of a porous material and an organic polymer on a fin, porous silica is added to an aqueous solution of an organic polymer such as a water-soluble polyolefin resin, and the aqueous solution containing this silica is Apply to the fin surface and let dry. When forming a hydrophilic film on the fin, in order to increase the corrosion resistance of the fin and the adhesion to the hydrophilic film, a chromate film is previously formed on the surface of the fin, and then a hydrophilic film is applied on top of the chromate film. It is preferable to form.

Examples of the synthetic resin corrosion-resistant coating include acrylic resin.

As the deodorizer, chemical deodorizers and oxygen deodorizers are used. Chemical deodorizers include ferrous sulfate, ferric sulfate, ferric hydrochloride, and sodium percarbonate (2Na2CO3・H2O2
), sulfate/hydrogen peroxide/salt complex (4Na2SO4
・2H2o2 ・NaC1>, hydrogen peroxide, persulfate-sulfuric acid cylinder 2a, calcium peroxide, alkaline earth metal peroxide, cumene hydroperoxide, penzoyl peroxide, acetyl peroxide, lauryl methacrylate, meth Acrylic acid ester, 1,2-
Examples include propylene oxide and 1,2-n-butylene oxide. Enzyme deodorizers include cellulase, amylase, protease, alkaline proase, and lipase.

In order to form a hydrophilic film containing a deodorizing agent or a corrosion-resistant film containing a deodorizing agent on the fins of a heat exchanger, one or two of the above-mentioned types may be added to the surface treatment liquid for forming a hydrophilic film or the surface treatment liquid for forming a corrosion-resistant film. At least one deodorizing agent is added, and a surface treatment liquid to which the deodorizer is added is applied to the fins, or the fins are immersed in the surface treatment liquid to which the deodorizer is added. The time between adding the deodorizing agent to the surface treatment liquid is, for example, 0.001 to 5
．． 0% by weight, preferably 0.01-0.5% by weight.

14- When adding a water-insoluble deodorizing agent to the surface treatment liquid, the deodorizing agent is made water-soluble in a sea surfactant and used.

Example In Fig. 1 and Fig. 4, the aluminum heat exchanger (1) consists of a meandering flat heat exchange tube (2) having a large number of refrigerant passages, and a straight tube portion (2a) of the same. It is composed of a corrugated fin (3) interposed between the
Headers (4) and (5) are attached to both ends of the heat exchange tube (2), respectively. A chromate film (6) is formed on the surface of the fin (3) attached to the heat exchange tube (2), and a hydrophilic film (8) containing the deodorizer (1) is formed on the surface of the fin (3).
) is formed.

Such a heat exchanger is manufactured, for example, as follows.

The thickness of the fins (3) of the heat exchanger (1) is 1 m.
Using a J TSA-1100H24 aluminum plate with a width of 5 Qn+m and a width of 5
The treatment is carried out at 0° C. for 3 minutes to form a chromate film (6) on the surface of the aluminum plate.

Next, 411 m2 of Alcalig and 0 glyoxal.
．． After applying an aqueous solution containing 8% by weight and 0.5% by weight of the deodorizing agent onto the surface of the chromate film (6) by roll coating, and drying at 160° C. for 10 minutes, the solution containing the deodorizing agent (7) is applied. A hydrophilic film (8) is formed.

Then, this aluminum plate was made into corrugated fins (3
), and after forming the fins (3) and heat exchange tubes (
2) to assemble the heat exchanger (1).

FIG. 2 shows a modification of the fin. This fin (
In 3), a corrosion-resistant film (9) containing a deodorizing agent (7) is formed on the surface of the fin (3), and a hydrophilic film (8) is formed on the surface of the fin (3).
is formed.

This fin (3) is made by applying a water-soluble acrylic resin to which 0.1% by weight of a deodorizing agent is added to the surface of an aluminum plate similar to that described above, so that the thickness of the fin (3) including the deodorizing agent (7) is approximately 1 micron. This aluminum plate It is manufactured by molding into the shape of a fin (3).

In this fin (3), the deodorizer (7) is contained only in the corrosion-resistant film (9), but the deodorizer (7) may also be contained in the hydrophilic film (8).

Moreover, the deodorizer (1) may be contained only in the hydrophilic film (8).

In addition, as shown in FIG.
You can also use

Furthermore, after assembling the heat exchanger, a surface treatment liquid for forming a hydrophilic film to which a deodorizing agent has been added or a surface treatment for forming a synthetic resin corrosion-resistant film coated with a deodorizing agent 111! The heat exchanger may be immersed in the liquid to form a hydrophilic film or a corrosion-resistant film containing a deodorizing agent on the entire surface of the heat exchanger.

Effects of the Invention In the aluminum heat exchanger according to the present invention, the surface of the fins is composed of a synthetic resin corrosion-resistant film and a hydrophilic film formed on the surface, and at least one film is coated with a deodorizing agent. Composite film included,
Since a corrosion-resistant synthetic resin coating containing a deodorizing agent or a hydrophilic coating containing a deodorizing agent is formed, an aluminum heat exchanger without unpleasant odors can be obtained.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an enlarged sectional view of a fin, FIG. 2 is an enlarged sectional view of a modified example of the fin, and FIG. 3 is an enlarged sectional view of another modified example of the fin. FIG. 4 is a schematic perspective view of the heat exchanger. (1)...Heat exchanger, (3)...Fin, (7)...
... Deodorizer, (8) ... Hydrophilic film, (9) ... Corrosion-resistant film. that's all

Claims (1)

[Claims] A composite film on the surface of the fin (3) consisting of a synthetic resin corrosion-resistant film (9) and a hydrophilic film (8) formed on the surface, and at least one film containing a deodorizing agent (7). , a synthetic resin corrosion-resistant film (9) containing a deodorizer (7)
), or an aluminum heat exchanger on which a hydrophilic film (8) containing a deodorizing agent (7) is formed.