JP3226463B2 - Aluminum plate fin material for heat exchanger and method for manufacturing cross fin tube using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an aluminum plate fin material and a cross fin tube for a heat exchanger, and in particular, after inserting a heat transfer tube into a predetermined mounting hole of an aluminum plate fin, expanding and fixing the heat transfer tube. TECHNICAL FIELD The present invention relates to an aluminum plate fin material for a heat exchanger which provides an aluminum plate fin capable of effectively suppressing the occurrence of fin pitch disturbance in a cross fin tube, and an advantageous method of manufacturing a cross fin tube using the same.

[0002]

2. Description of the Related Art Conventionally, heat exchangers that operate as evaporators or condensers have been used in air conditioners such as home air conditioners, automobile air conditioners, package air conditioners, and refrigerators. Among them, a cross fin tube heat exchanger (plate fin tube heat exchanger) is most commonly used for a room air conditioner for home use and a package air conditioner for business use. The cross fin tube constituting the cross fin tube heat exchanger includes an aluminum plate fin on the air side and a heat transfer tube (copper tube) on the refrigerant side. Such a cross fin tube is obtained by first obtaining an aluminum plate fin in which a plurality of predetermined mounting holes are formed from an aluminum plate fin material by press working, and then laminating the obtained aluminum plate fin. The heat transfer tube can be obtained by inserting a separately manufactured heat transfer tube into the mounting hole, and then expanding and fixing the heat transfer tube to an aluminum plate fin.

In recent years, for the purpose of improving the heat exchange efficiency of the cross fin tube heat exchanger, the interval between the laminated aluminum plate fins, that is, the fin pitch of the cross fin tube, has been reduced.
When the fin pitch is reduced in such a manner, when performing the work of expanding and fixing the heat transfer tubes, aluminum plate fins stick to each other, so-called fin pitch disorder (Abeck phenomenon) is likely to occur.
And when this fin pitch disturbance is caused,
Not only is the appearance unfavorable, but also because the water droplets tend to accumulate, the ventilation resistance of the air passing between the fins is significantly increased, and the heat exchange efficiency is rather lowered.

In general, the fin pitch disturbance is more likely to occur as the fin pitch becomes smaller, as the hardness of the aluminum plate fin becomes harder, and further, as the expansion ratio becomes larger, It is considered that the occurrence of fin pitch disturbance is suppressed by using a soft material for the aluminum plate fins, increasing the fin pitch, or suppressing the expansion ratio. However, when the fin pitch is increased, the total surface area of the fins is reduced, and the heat exchange efficiency is reduced. Therefore, such a measure is not an essential solution. Also, plate fins can be roughly classified into a draw method and a drawless method (ironing method). In recent years, a drawless method using a thin and hard material has been adopted to reduce costs. In the use of such a hard material, from the viewpoint of improvement in handling properties, improvement in heat exchange efficiency due to increase in the tightening force of the heat transfer tube, measures to adopt the soft material described above are desirable. There is no. Furthermore, when the expansion ratio is reduced, the contact between the aluminum plate fins and the heat transfer tubes tends to be insufficient, which causes a problem that the heat exchange efficiency is reduced.

As described above, various measures have been considered to prevent or suppress the occurrence of the fin pitch disturbance. However, any of the methods is intended to avoid the occurrence of the fin pitch disturbance. In addition, since it is not possible to avoid a decrease in heat exchange efficiency, it cannot be said that this is an effective method. Therefore, without reducing the heat exchange efficiency, it is possible to advantageously prevent the occurrence of fin pitch disturbance. The development of aluminum plate fin materials is desired.

The inventors of the present invention have conducted various studies to find the cause of the above-mentioned fin pitch disturbance, and found that the fin pitch disturbance is caused by the following mechanism. Findings were obtained.

That is, first, in FIG. 1, in a plurality of laminated aluminum plate fins 2, a heat transfer tube 8 is inserted into an assembling hole 6 in which a cylindrical collar portion 4 is provided. The state before the expansion is performed is shown. There, the collar portion 4 is provided so as to extend perpendicularly to the aluminum plate fin 2 at a predetermined height, and the tip of the collar portion 4 is in a state where the inner surface of the collar portion 4 is warped. A curl (flare) portion 10 is formed. In this state, when the heat transfer tube 8 is expanded by inserting the expander (plug) 12, the outer diameter of the heat transfer tube 8 becomes larger than the inner diameter of the collar portion 4 of the mounting hole 6. The inner diameter of the assembling hole 6 (collar part 4) is also expanded together with the outer diameter of the heat transfer tube 8. At this time, the thickness of the aluminum plate fin 2 is usually 0.10 mm to
Since the thickness is as thin as 0.12 mm, it cannot be absorbed only by the in-plane deformation, that is, the change in the inner diameter of the assembling hole 6, so that the out-of-plane deformation occurs.

This out-of-plane deformation is usually more stable when the root angle α of the collar portion 4 is made obtuse. Therefore, each aluminum plate fin 2 is formed as shown in FIG.
As shown in FIG. 2A, the collar portion 4 should be deformed so as to increase the root angle: α, but in practice, as shown in FIG. The obtuse angle and the acute angle are mixedly generated. In this way, the root angles that should all be obtuse should be:
Since a part of α becomes sharp, there is a portion where the fin pitch becomes larger or smaller, which causes fin pitch disturbance.

The reason why the obtuse angle and the acute angle of the root angle α are mixed as described above is that when the heat transfer tubes 8 are expanded with the aluminum plate fins 2 stacked, the expansion proceeds. As a result, it is conceivable that a compression reaction force is generated in the aluminum plate fins 2 and expansion is performed under an unusual state. More specifically, the heat transfer tube 8 is expanded by inserting the expander 12, but in general, when the tube diameter is increased by the expansion, the length in the tube axis direction is reduced. Then, the contraction of the heat transfer tube in the tube axis direction is transmitted to the plate fins in the portion where the tube expansion has not been performed yet, and the collar portion 4 provided in the plate fin assembling hole 6 located in this portion. , Are subjected to compressive deformation in the tube axis direction, that is, in the height direction. However, the curl part 10
When receiving such a compressive deformation, a repulsive force (compression reaction force) that attempts to restore the deformation is generated. Therefore, the fins other than the aluminum plate fin to be expanded first are expanded while some compression reaction force is generated (the inner diameter of the collar portion 4 is expanded).

[0010] As described above, when the heat transfer tube is expanded, the aluminum plate fins are subjected to the action of a compression reaction force in addition to the radial force in the mounting hole. In the collar portion of the aluminum plate fin, the amount of compressive deformation is small and the compression reaction force is also small, so the fin deforms against the compressive force in a direction in which the base angle α of the collar portion becomes obtuse, but the expansion proceeds. When the amount of compressive deformation and the compressive reaction force increase, it becomes impossible to counteract the compressive force, and some fins are deformed in the opposite direction, that is, the direction in which the collar root angle: α becomes acute, and fin pitch disturbance is caused. It becomes.

As a result of further studies by the present inventors, when the heat transfer tube is expanded, a compression reaction force due to the compression deformation is generated in the collar portion. It has been found that, at the contact portion with the aluminum plate fin located immediately below, it tends to be reduced due to slippage. That is, since the aluminum plate fins arranged above and below slide relatively to each other, the compression reaction force is reduced.
However, when the frictional resistance at the contact portion is large, the sliding reaction cannot be performed.
It will remain as it is.

In short, the fin pitch disturbance is caused by expanding the heat transfer tube in a state in which the collar portion of the aluminum plate fin in the unexpanded portion has a compression deformation and a compression reaction force. Therefore, it was concluded that in order to suppress or prevent the occurrence of the fin pitch disturbance, it is sufficient to reduce the compression reaction force, and it is effective to reduce the friction between the aluminum plate fins. is there.

[0013]

Here, the present invention has been completed based on the above-mentioned findings, and the problem to be solved is that after inserting a heat transfer tube into a predetermined mounting hole of an aluminum plate fin. In a cross fin tube in which the heat transfer tube is expanded and fixed to an aluminum plate fin, an aluminum plate fin material for a heat exchanger having a reduced surface friction coefficient to provide an aluminum plate fin capable of suppressing occurrence of fin pitch disturbance. It is also an object of the present invention to provide a method for advantageously producing a cross-fin tube having no fin pitch disturbance by using such an aluminum plate fin material for a heat exchanger having a reduced surface friction coefficient. is there.

[0014]

In order to solve such a problem, the present invention provides an aluminum plate having a plurality of mounting holes in which a cylindrical collar portion having a predetermined height is provided around the holes by press working. By using a fin, a heat transfer tube is inserted into its mounting hole and expanded to provide the aluminum plate fin in a cross fin tube having a structure in which the heat transfer tube is integrated with the aluminum plate fin. An aluminum plate fin material for a heat exchanger, having a hydrophilic film formed of a hydrophilic paint containing a hydrophilic lubricant over the entire surface, and having a friction coefficient of 0 without oil on the surface. .
The gist of the present invention is an aluminum plate fin material for a heat exchanger, which is set to 15 or less.

That is, such an aluminum plate fin material for a heat exchanger according to the present invention has a hydrophilic film formed of a hydrophilic paint containing a hydrophilic lubricant, and has a surface free of oil coating. Since the coefficient of friction is 0.15 or less, excellent lubricity can be exhibited. Therefore, when laminating the aluminum plate fins obtained by pressing the aluminum plate fin material, the frictional resistance between the aluminum plate fins is reduced, and the predetermined assembly provided on the aluminum plate fins is reduced. By inserting the heat transfer tube into the hole and expanding the heat transfer tube, when the heat transfer tube and the aluminum plate fin are fixed to each other, the fins slide with each other even if the aluminum plate fin undergoes compression deformation. As a result, the generation of the compression reaction force accompanying the compression deformation can be advantageously suppressed.

Moreover, in the aluminum plate fin material according to the present invention, since the hydrophilic film having excellent lubricity is formed before the press working, the lubricating property allows the press working to be performed. When obtaining plate fins, not only good formability is obtained, but also when heat transfer tubes are inserted into the obtained aluminum plate fins, the heat transfer tubes can be smoothly inserted. -ing

Further, the present invention uses an aluminum plate fin provided with a plurality of assembling holes in which a cylindrical collar portion having a predetermined height is provided around the hole by pressing.
A method of manufacturing a cross fin tube by inserting a heat transfer tube into the mounting hole and expanding and fixing the heat transfer tube to the aluminum plate fin, thereby integrally assembling the aluminum plate fin and the heat transfer tube. In the above, as the aluminum plate fin material for a heat exchanger providing the aluminum plate fins, a hydrophilic film formed of a hydrophilic paint containing a hydrophilic lubricant over the entire surface, and a non-coated surface A method of manufacturing a cross fin tube using an aluminum plate fin material having a friction coefficient of 0.15 or less in oil is also the gist of the invention.

In the method for manufacturing a cross fin according to the present invention, as the aluminum plate fin material for providing the aluminum plate fin, a hydrophilic paint containing a hydrophilic lubricant is used over the entire surface. Since an aluminum plate fin material having a formed hydrophilic film and having a friction coefficient of 0.15 or less without oil on the surface is used, it is obtained by pressing this aluminum plate fin material. The aluminum plate fin has excellent lubricity. Therefore, the heat transfer tube is inserted through a predetermined mounting hole formed in the aluminum plate fin, and the heat transfer tube is expanded and fixed to the aluminum plate fin.
When manufacturing the cross fin tube, even if the aluminum plate fins are subjected to compressive deformation, the fins slide with each other, whereby the generation of a compression reaction force due to the compressive deformation can be advantageously suppressed, and the fin pitch The occurrence of disturbance is effectively suppressed.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the aluminum plate fin material for a heat exchanger according to the present invention, a hydrophilic film is formed over the entire surface thereof with a hydrophilic paint containing a hydrophilic lubricant. And the coefficient of friction of the surface without oil coating is set to 0.15 or less. As a material used for such an aluminum plate fin material, a material conventionally used as a fin material has been used. Any of the aluminum materials that can be used, and in recent years, with the thinning of the fin material, since high strength is used, even in the present invention,
Such a high-strength material is advantageously used.

In the present invention, as a hydrophilic paint used for forming a predetermined hydrophilic film, a conventionally known hydrophilic paint can be used, and in general, a water glass-based hydrophilic paint and a resin-based hydrophilic paint are used. A hydrophilic paint, a hydrophilic paint obtained by mixing a resin-based hydrophilic paint and a silica-based hydrophilic paint, or the like can be employed. More specifically, as the water glass-based hydrophilic paint, for example, Japanese Patent Publication No. 6-73934
Japanese Patent Application Publication No. 5-71382, for example, a hydrophilic paint containing an alkali silicate and a hydrophilic polymer compound as main components as disclosed in Japanese Patent Publication No. JP-A-2-215871, JP-B-6-57810, JP-A-64-266
For example, a paint containing a hydrophilic resin as a main component as shown in JP-A-77-77 can be exemplified. Further, as a hydrophilic paint obtained by combining a resin-based hydrophilic paint and a silica-based hydrophilic paint, for example, a hydrophilic paint resin and colloidal silica as disclosed in JP-A-59-185996 and the like are used. It is possible to exemplify a paint as a main component.

Further, the hydrophilic lubricant used in the present invention is used to improve the lubricity of the hydrophilic film formed on the surface of the aluminum plate fin material. It is hydrophilic so as not to impair its properties. Specific examples of such a hydrophilic lubricant include polyethylene glycol (polyethylene oxide), polyoxyethylene polyoxypropylene glycol, polyoxypropylene polyoxyethylene alkyl ether, and polyoxypropylene polyoxyethylene glyceryl ether. Ethers; dicarboxylic acid esters of polyether such as polyethylene glycol succinate; ammonium salts or alkali metal salts of dicarboxylic acid esters of polyether; diglycidyl ethers of polyether such as polyethylene glycol diglycidyl ether; laurin C ₁₂ such as sodium silicate, potassium myristate, sodium palmitate, potassium stearate, etc.
Examples of the above alkali metal salts of higher fatty acids can be given. The polyether used as the hydrophilic lubricant preferably has a molecular weight of 1,000 or more. This is because, when the molecular weight of the polyether is small, the lubricating effect is reduced, and the lubricating effect of the hydrophilic lubricant is hardly sufficiently exerted.

In the aluminum plate fin material according to the present invention, a hydrophilic coating containing the hydrophilic lubricant is applied to the aluminum material to form a hydrophilic film and a surface of the aluminum material. By making the coefficient of friction of uncoated oil less than 0.15,
Can be obtained.

As a method for forming a hydrophilic coating film with a hydrophilic paint containing a hydrophilic lubricant, various conventionally known methods can be used.
No. 125437, Japanese Patent Publication No. 57-46000,
JP-A-61-227877, JP-B-6-7393.
The technique disclosed in Japanese Patent Publication No. 4 and the like can be adopted. More specifically, for example, after degreasing the aluminum material, after performing a chemical conversion treatment with phosphoric acid chromate,
A method of forming a hydrophilic film by applying a hydrophilic paint containing the hydrophilic lubricant to an aluminum plate fin material according to a roll coater method and heating and drying this material can be used.

The coefficient of friction was determined using a Bowden-Leben friction tester with a steel ball diameter of 3/16 inch, a load of 0.2 kgf, a sliding speed of 3.87 mm / sec, and a temperature of 20 ° C. It is represented by the measured value under the conditions.

Further, the content ratio of the hydrophilic lubricant with respect to the hydrophilic paint is not particularly limited as long as the friction coefficient of the surface of the aluminum plate fin material without oil is 0.15 or less. Although not required, it is generally at least 5% by weight. However, if the content of the hydrophilic lubricant is less than 5% by weight, the lubricity of the surface of the obtained aluminum plate fin material tends to be insufficient.

In general, the surface of the aluminum plate fin material is required to have hydrophilicity and corrosion resistance. Generally, the more hydrophilic the film, the lower the corrosion resistance. Before forming a hydrophilic film, the aluminum plate fin material conforms to the conventional methods known in the art for forming a corrosion-resistant film on a base, such as a chemical treatment or a corrosion-resistant surface treatment by organic resin coating. It does not matter what you do.

Further, in the method for advantageously producing a cross fin tube according to the present invention, as described above, aluminum having a hydrophilic film containing a hydrophilic lubricant formed on the entire surface thereof is provided. The use of a plate fin material is a major feature, but otherwise, a method similar to a conventionally known method for manufacturing a cross fin tube is applied.

More specifically, first, an aluminum plate fin material on which a hydrophilic film containing a hydrophilic lubricant is formed over the entire surface is prepared.
The aluminum plate fin material is pressed using a drawless die or the like to obtain an aluminum plate fin having a mounting hole provided with a collar portion having a predetermined height. Next, a predetermined heat transfer tube is inserted through the obtained hole of the aluminum plate fin, and then a plug is inserted into the heat transfer tube to expand the heat transfer tube. Thus, a cross fin tube in which are integrally fixed can be manufactured.

[0029]

EXAMPLES In order to clarify the present invention more specifically, some examples of the present invention will be shown below.
It goes without saying that the present invention is not subject to any restrictions by the description of such embodiments. In addition, in addition to the following examples, the present invention, in addition to the above-described specific description, various changes, corrections, and modifications based on the knowledge of those skilled in the art without departing from the spirit of the present invention. It should be understood that improvements can be made.

First, in the combinations shown in the following Tables 1 to 4, various hydrophilic treating agents were prepared by adding various hydrophilic lubricants to various hydrophilic paints. In the tables, hydrophilic paints A to F indicate hydrophilic paints having the following compositions.

A: Water glass-based hydrophilic paint Alkali silicate (SiO ₂ / Na ₂ O = 3.5) 10 parts by weight Hydroxyethyl acrylate-acrylic acid copolymer 2 parts by weight Ammonium zirconium carbonate 0.5 part by weight Part B: Resin-based hydrophilic paint + silica-based hydrophilic paint Acrylic resin 70 parts by weight Melamine resin 15 parts by weight Polyoxyethylene alkylphenyl ether (surfactant) 10 parts by weight Colloidal silica 5 parts by weight C: Resin-based hydrophilic paint Hydroxyethyl cellulose (water-soluble cellulose resin) 10 parts by weight Acrylic acid-acrylamide copolymer (water-soluble acrylic resin) 10 parts by weight D: resin-based hydrophilic paint 2-acrylamide-2-methylpropanesulfonic acid 20 parts by weight methacrylic acid 60 Parts by weight methyl methacrylate 15 parts by weight dimethyl Aminoethyl methacrylate 5 parts by weight E: Resin-based hydrophilic paint 25 parts by weight of sodium salt of carboxymethylcellulose 50 parts by weight of ammonium salt of carboxymethylcellulose 25 parts by weight of N-methylolacrylamide Sodium alkyldiphenyletherdisulfonate (surfactant) 5 parts by weight F : Resin-based hydrophilic paint Polyvinyl alcohol 50 parts by weight Carboxymethyl cellulose 50 parts by weight Zirconium chelate compound 5 parts by weight Dialkyl sulfosuccinate ester salt (surfactant) 5 parts by weight

[0032]

[Table 1]

[0033]

[Table 2]

[0034]

[Table 3]

[0035]

[Table 4]

Next, an aluminum plate fin material for drawless and DOF (Dry Oil Fin Die) having a thickness of 0.10 mm was prepared, and a degreasing treatment was performed using a commercially available weak alkaline degreasing agent. Then, a chemical conversion film mainly composed of phosphoric acid chromate was formed with a liquid composed of chromic acid, phosphoric acid, and hydrofluoric acid.

Further, the aluminum plate fin material subjected to the chemical conversion treatment is coated with a roll coater using each of the hydrophilic treatment agents prepared above,
Thereafter, a predetermined hydrophilic film was baked and cured by performing a heat treatment at 200 ° C. for 20 seconds to obtain aluminum plate fin materials of Examples 1 to 19 of the present invention and Comparative Examples 1 to 8.

Incidentally, in the aluminum plate fin materials of Examples 1 to 5 of the present invention and Comparative Examples 1 to 3,
A hydrophilic film was formed such that the i amount was 120 mg / m ² . In addition, inventive examples 6 to 9, inventive examples 13 to 14,
In the aluminum plate fin materials of Comparative Examples 4 and 6, a hydrophilic coating was formed so that the thickness of the coating was 1 μm. Further, in the aluminum plate fin materials of Examples 10 to 12 of the present invention and Comparative Example 5, a hydrophilic film was formed such that the film thickness became 0.4 μm. Furthermore, in the aluminum plate fin materials of Examples 15 to 19 of the present invention and Comparative Examples 7 and 8, hydrophilic films were formed such that the thickness of the films became 0.3 μm.

With respect to each of the aluminum plate fin materials of the present invention and the comparative examples thus obtained, the coefficient of friction on the surface of the aluminum plate fin without oil was measured.
The values are shown in Tables 1 to 4. However, the coefficient of friction was measured using a Bowden-Leben friction tester under the conditions of a hard sphere diameter of 3/16 inch, a load of 0.2 kgf, a sliding speed of 3.87 mm / s, and a temperature of 20 ° C. The measured value was adopted.

Then, each aluminum plate fin material on which the hydrophilic film is formed is pressed using a 9.52 mmφ drawless mold (manufactured by Hidaka Seiki Co., Ltd.) to have a height of 1.6 mm. The aluminum plate fins with ribs in one row and eight stages in which the mounting holes provided with the collar portions were formed were produced.

Thereafter, a heat transfer tube of 9.52 mmφ (copper tube with an inner surface groove) was inserted into the mounting hole of the obtained aluminum plate fin, and the heat transfer tube was inserted into the heat transfer tube by 9.14 mm.
By inserting a plug of φ, the heat transfer tube was expanded and fixed to an aluminum plate fin to produce a cross fin tube. For the cross fin tube thus obtained, the fin pitch disturbance
Evaluation was made based on the value of [the number of fin pitch disturbances of the cross fin tubes / the total number of manufactured cross fin tubes]. The results are shown in Tables 1 to 4. The expansion rate (outer diameter expansion rate) of the heat transfer tube is
5%, and the tube expansion speed was 40 mm / s.

As a result, as shown in Tables 1 to 4, when the cross fin tube was manufactured using the aluminum plate fin material of the present invention, the fin pitch disturbance did not occur at all. On the other hand, when the cross fin tube was manufactured using the aluminum plate fin material of the comparative example, fin pitch disturbance occurred in almost all the cross fin tubes.

More specifically, the aluminum plate fin material of the present invention is manufactured by using a hydrophilic treatment agent obtained by adding a hydrophilic lubricant to a hydrophilic paint. Since the friction coefficient of the surface without oil was 0.15 or less, no fin pitch disturbance occurred in the cross-fin tube manufactured using the same. On the other hand, although it is made using only a hydrophilic paint or is made using a hydrophilic treatment agent in which a hydrophilic lubricant is contained in the hydrophilic paint, the oil is not applied on the surface of the paint. In the aluminum plate fin material of the comparative example in which the coefficient of friction was larger than 0.15, the fin pitch disturbance occurred in the cross fin tube manufactured using the same.

The aluminum plate fin materials of Comparative Examples 2 and 3 were produced by applying a hydrophilic treatment agent obtained by adding a hydrophilic lubricant to a hydrophilic paint. Regardless, the coefficient of friction without oiling is 0.
Although it is larger than 15, this is because the hydrophilic lubricant according to Comparative Example 2 has a molecular weight of 1000 or less, and the hydrophilic lubricant according to Comparative Example 3 has It is considered that because the content was less than 5% by weight, the lubricity of the hydrophilic lubricant could not be sufficiently exhibited.

[0045]

As is clear from the above description, in the aluminum plate fin material for a heat exchanger according to the present invention, a hydrophilic film is formed by a hydrophilic paint containing a hydrophilic lubricant. Because of this, excellent lubricity can be exhibited, and even if a heat transfer tube is inserted into an aluminum plate fin obtained by pressing it and expanded and fixed, fin pitch disturbance is unlikely to occur. is there.

According to the method for producing a cross fin tube according to the present invention, the aluminum plate fin material having excellent lubricity as described above is used as the aluminum plate fin material for providing the aluminum plate fin. It is possible to advantageously produce a cross-fin tube having almost no fin pitch disturbance, and therefore having a good appearance and a very good heat exchange efficiency.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view showing a state before expansion of a tube in which a heat transfer tube is inserted into a mounting hole of an aluminum plate fin.

FIGS. 2A and 2B are enlarged explanatory views of a main part showing arrangement of fins of a cross fin tube after expansion, wherein FIG. 2A shows a case where a fin pitch is normal, and FIG. It represents what is.

[Explanation of symbols]

 2 Aluminum plate fin 4 Collar part 6 Assembly hole 8 Heat transfer tube 10 Curl part 12 Expander

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsuhiro Tamaki 5-1-1-3 Shimbashi, Minato-ku, Tokyo Inside Sumitomo Light Metal Industries Co., Ltd. (72) Inventor Norihisa Isomura 5-3-1 Shimbashi, Minato-ku, Tokyo No. Sumitomo Light Metal Industry Co., Ltd. (72) Inventor Takatoshi Kido 5-1-1-3 Shimbashi, Minato-ku, Tokyo Sumitomo Light Metal Industry Co., Ltd. (56) References JP-A-1-208697 (JP, A) JP-A-8-187818 (JP, A) JP-A-3-281021 (JP, A) JP-B-7-69115 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F28F 1/00-1/42 B21D 53/08

Claims (6)

(57) [Claims] 1. An aluminum plate fin having a plurality of mounting holes each having a cylindrical collar portion having a predetermined height provided around the hole by press working, and a heat transfer tube is inserted through the mounting hole. By expanding the pipe, a cross fin tube having a structure in which the heat transfer tube is integrally attached to the aluminum plate fin is provided as an aluminum plate fin material for a heat exchanger that provides the aluminum plate fin, and the entire surface thereof is provided. A heat-exchanger having a hydrophilic film formed of a hydrophilic paint containing a hydrophilic lubricant and having a coefficient of friction of 0.15 or less in oil-free surface. Aluminum plate fin material. 2. An aluminum plate fin having a plurality of mounting holes having a cylindrical collar portion of a predetermined height provided around the hole by press working, and a heat transfer tube is inserted through the mounting hole. A method of manufacturing a cross fin tube by integrally assembling the aluminum plate fin and the heat transfer tube by expanding and fixing the heat transfer tube to the aluminum plate fin, wherein the heat exchanger tube is provided with the aluminum plate fin. As an aluminum plate fin material, it has a hydrophilic film formed of a hydrophilic paint containing a hydrophilic lubricant over the entire surface, and has a friction coefficient of 0.15 or less with no oil applied on the surface. A method for manufacturing a cross fin tube, comprising using a finished aluminum plate fin material. 3. The method according to claim 1 , wherein the step of forming the hydrophilic film comprises:
Corrosion resistant surface treatment for aluminum plate fin material
Process is performed and the corrosion-resistant coating is formed as a base
A method for manufacturing the cross fin tube according to claim 2. 4. The chemical-resistant surface treatment is a chemical conversion treatment,
As a result, the chemical conversion film is
4. The cross fin tube according to claim 3, wherein the cross fin tube is formed as a cross section.
The method of manufacturing the probe. 5. The method according to claim 1 , wherein the hydrophilic lubricant is contained in the hydrophilic paint.
In a proportion of at least 5% by weight
A crossfinch according to any one of claims 2 to 4.
Method of manufacturing tube. 6. The method according to claim 1, wherein the hydrophilic lubricant is a polyether,
Dicarboxylic acid esters of polyether, polyether
Ammonium salts or dicarboxylic acid esters
Potassium metal salts, diglycidyl ethers of polyethers,
And the group consisting of alkali metal salts of C ₁₂ or higher fatty acid
The method according to any one of claims 2 to 5, which is selected from
A method for manufacturing a loss fin tube.