JP2001201288A - Fin-and-tube type heat exchanger for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fin-and-tube type heat exchanger comprising an antibacterial action, in addition to deodorization by decomposing odor components and organic components in domestic order sticking to the heat exchanger which is contained in the circulating air, without having degrade the hydrophilic function during operation. SOLUTION: A tube 11, in which a fluid flows, and multiple fins 14 arranged parallel to each other at a fixed interval, are provided. A hydrophilic coat 13 added with contamination-proof agent and deodorant is provided on the surface of the fin. Thus, an organic material sticking to the surface of fin 14 is decomposed, propagation of mold is suppressed, and the occurrence of adsorption order and mold order are prevented, to maintain hydrophilicity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fin and tube heat exchanger for an air conditioner.

[0002]

2. Description of the Related Art Conventionally, the structure of a fin-and-tube type heat exchanger incorporated in an air conditioner is provided by imparting not only corrosion resistance but also hydrophilicity to the fin surface.
During the cooling operation, the condensed water adhering to the fin surface does not form water droplets, but is completely wetted, lowering the ventilation resistance and reducing noise.

As such a hydrophilic treatment method, there are a boehmite treatment, a silicate, and a mixed coating layer of an organic polymer and a silicate compound (JP-A-61-8598).

On the other hand, the airtightness of the housing structure and changes in lifestyle have created an environment where dew condensation occurs and bacteria and fungi can easily propagate. The health disorders caused by molds and bacteria have generated social interest and problems, and clean comfortable spaces have been attracting attention, and antibacterial and antifungal measures in air conditioners have become strong social needs.

[0005] Some air conditioners, such as heat exchangers, air filters, fans, etc., in which bacteria and molds are frequently propagated, are particularly in contact with dirty air and have the largest heat contact area and the heat which is a starting point of dew condensation. Notable in exchangers.

For this reason, in order to prevent mold propagation and mold odor, attempts have been made to add a fungicide to the fins of a heat exchanger provided with a hydrophilic coating (for example, Japanese Patent Application Laid-Open No. 1-266).
493). As a fungicide, a benzimidazole compound (Coatside manufactured by Takeda Pharmaceutical Co., Ltd.) or the like is used.

A conventional example will be described below. A conventional fin-and-tube heat exchanger has a structure in which a tube through which a fluid flows and fins provided with a number of hydrophilic coatings arranged in parallel at regular intervals are closely attached to the outer periphery of the tube. The surface of the fin material is provided with a mildewproofing agent or a hydrophilic coating containing a mildewproofing agent and a surfactant, so that a fin material for a heat exchanger having particularly excellent antifungal and antibacterial effects can be obtained. .

[0008]

However, since the antifungal agent has water repellency, if a large amount of the antifungal agent is mixed into the fins of the heat exchanger provided with the hydrophilic coating, the hydrophilicity is reduced and noise is reduced. Had the problem of increasing.

[0009] In addition, since the hydrophilic film has a fine surface morphology and is porous, it easily adsorbs odor components and organic substances, which promotes the growth of mold and generates an adsorbed odor and a mold odor when the air conditioner is actually operated. There was a problem that.

[0010] In view of the above problems, the present invention suppresses the growth of mold and bacteria without reducing hydrophilicity,
An object of the present invention is to provide a fin-and-tube heat exchanger provided with an antifouling agent and a deodorant capable of preventing an unpleasant odor generated from mold and the like.

[0011]

In order to achieve the above object, a fin-and-tube heat exchanger of the present invention comprises a plurality of fins arranged in parallel at regular intervals and a tube through which a fluid flows. The anti-fouling agent and the deodorizing agent are provided to the hydrophilic coating on the surface of the fin.

[0012] This makes it possible to suppress the growth of mold and bacteria generated in the heat exchanger and to prevent an odor generated by mold and the like.

[0013]

DETAILED DESCRIPTION OF THE INVENTION According to the first aspect of the present invention, there are provided a plurality of fins arranged in parallel at regular intervals,
A fin-and-tube heat source, comprising a tube through which a fluid flows, and a hydrophilic film provided on one surface of the fin, and an antifouling agent and a deodorant applied to the hydrophilic film on the other surface. It is an exchanger.

These hydrophilic films and hydrophilic films provided with an antifouling agent and a deodorant can be formed by thin-film coating one surface at a time by a spin coating method or a bar coating method.

According to the present invention, the hydrophilic film contains a photocatalytic titanium oxide serving as an antifouling agent and a deodorant in the hydrophilic film, and a film formed of an inorganic binder exists in the air in addition to the OH group on the surface. Adsorbs aldehyde groups and carboxyl groups of organic substances that cause daily odor. The aldehyde group and the carboxyl group attached to the surface are decomposed into carbon dioxide gas CO ₂ and water H ₂ O by the titanium oxide which has been photoactivated.
The OH group adsorbs moisture in the air, forms a water film and enters the hydrophilic film to create a super-hydrophilic state, thus suppressing the generation of mold and the like in the heat exchanger and deodorizing mold odor,
Has the function of maintaining the hydrophilicity of the fins of the heat exchanger.

According to a second aspect of the present invention, there are provided a plurality of fins arranged in parallel at regular intervals and a tube through which a fluid flows, wherein the fins are provided with a hydrophilic coating. And a fin in which an antifouling agent and a deodorant are applied to the hydrophilic film.

[0017] The hydrophilic film is thin-film coated on both sides of the fin, and the hydrophilic film provided with an antifouling agent and a deodorant alternately with the fin is prepared by dipping the fin provided with the hydrophilic film in advance. It is possible to use a material which is made by repeatedly applying the same method.

According to the present invention, a hydrophilic film provided with an antifouling agent and a deodorant having the above structure contains a photocatalytic titanium oxide, and a film formed with an inorganic binder has an OH on the surface.
It adsorbs aldehyde groups and carboxyl groups of organic substances present in the air as living odors in addition to the groups. The aldehyde group and carboxyl group attached to the surface are decomposed into carbon dioxide gas CO ₂ and water H ₂ O by the photo-activated titanium oxide, and the OH group adsorbs moisture in the air, forming a water film and hydrophilic. It has a function of suppressing the generation of mold and the like in the heat exchanger, deodorizing mold odor, and maintaining the hydrophilicity of the fins of the heat exchanger because it enters the hydrophilic film and produces a superhydrophilic state.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of a main part of a fin of a fin-and-tube heat exchanger according to a first embodiment of the present invention.
Shows a perspective view of the fin-and-tube heat exchanger.

As shown in FIGS. 1 and 2, a fin-and-tube heat exchanger 10 according to a first embodiment of the present invention has a hydrophilic coating 12 on one side of a tube 11 in which a fluid flows.
And a fin 14 having a hydrophilic coating 13 provided with an antifouling agent and a deodorant (not shown) on the other surface is arranged in parallel at regular intervals. The fins 14
A corrosion-resistant coating 15 is applied to the surface of the substrate in advance.

In this embodiment, a hydrophilic coating 12 is provided on one side and a hydrophilic coating 13 is provided on the other side with an antifouling agent and a deodorant.
By arranging the fins 14 having a constant distance in parallel, during cooling operation, the condensed water adhering to the fin surface does not form water droplets, and is completely wetted to reduce ventilation resistance,
Along with reducing noise, the antifouling agent and deodorant can exhibit the antifouling and deodorizing effects of deodorizing airborne odor components and organic components on the fin surface and dissolving those dissolved in condensed water. As a result, it is possible to prevent the growth of mold and the generation of offensive odors in the heat exchanger body.

The antifouling agent and the deodorant are obtained by thin-film coating of highly active photocatalytic titanium oxide developed by Ishihara Sangyo Co., Ltd. by a spin coating method or a bar coating method. It has the function of decomposing malodorous components and organic components, and at the same time, is chemically stable and has high antibacterial properties, is highly safe, and has a function of repeatedly maintaining its photocatalytic function by repeating its self-regenerating function.

FIG. 3 is a sectional view of a main part of a fin of a fin-and-tube heat exchanger according to a second embodiment of the present invention, and FIG. 4 is a perspective view of the fin-and-tube heat exchanger.

As shown in FIGS. 3 and 4, a fin-and-tube heat exchanger 20 according to a second embodiment of the present invention has a fin 24 in which a hydrophilic coating 22 is provided on a tube 21 through which a liquid flows. And fins 25 having a hydrophilic coating 23 provided with an antifouling agent and a deodorant on the hydrophilic coating 22 are arranged at regular intervals in parallel and alternately. In addition, the two types of fins 24 and 25 are provided with a corrosion-resistant coating (not shown) on the surface of the substrate in advance.

The fin-and-tube type heat exchanger 20 of this embodiment comprises a fin 24 provided with a hydrophilic coating 22 and a hydrophilic coating 2 provided with an antifouling agent and a deodorant on the hydrophilic coating 22.
By arranging the fins 25 with the fins 3 in parallel at regular intervals and alternately, during cooling operation, the condensed water adhering to the fin surface does not form water droplets, is completely wetted and reduces ventilation resistance, Along with reducing noise, the antifouling agent and deodorant have an antifouling effect that decomposes odor components and organic components in the air that adhere to the fin surface and dissolve into condensed water.
Since a deodorizing effect can be exhibited, it is possible to prevent the growth of mold and the generation of offensive odor in the heat exchanger body.

The antifouling agent and deodorant are highly active photocatalytic titanium oxides developed by Ishihara Sangyo Co., Ltd. which are coated with a thin film by a dip method or the like. It decomposes components and at the same time has antibacterial performance, is chemically stable, has high safety, and also has a function of repeatedly maintaining its photocatalytic function by repeating its self-renewal function.

[0027]

As described above, the fin-and-tube heat exchanger of the air conditioner of the present invention has a large number of fins arranged in parallel at regular intervals and a tube through which a fluid flows. A fin in which a hydrophilic film is provided on one side of the fin and a hydrophilic film provided with an antifouling agent and a deodorant on the other surface, or a fin having both sides treated with a hydrophilic film; Mold propagation without lowering hydrophilicity by a combination of multiple types of fins with different hydrophilic treatments, such as alternately providing fins provided by applying a hydrophilic film provided with an antifouling agent and a deodorant on the surface And an antifouling effect and a deodorizing effect of preventing generation of unpleasant odors such as organic component adsorption odor and mold odor.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a fin constituting a fin-and-tube heat exchanger according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a fin-and-tube heat exchanger according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a fin constituting a fin-and-tube heat exchanger according to a second embodiment of the present invention.

FIG. 4 is a perspective view of a fin-and-tube heat exchanger according to a second embodiment of the present invention.

[Explanation of symbols]

10, 20 Fin-and-tube heat exchanger 11, 21 tube 12, 22 Hydrophilic coating provided on fin surface 13, 23 Hydrophilic coating provided with antifouling agent and deodorant provided on fin surface 14, 24, 25 fin

Claims (2)

[Claims] 1. A fin comprising a plurality of fins arranged in parallel at regular intervals and a tube through which a fluid flows, wherein a hydrophilic coating is provided on one surface of the fin, and the fin is provided on the other surface. A fin-and-tube heat exchanger for an air conditioner, wherein fins provided with an antifouling agent and a deodorant are provided on a hydrophilic film. 2. A fin comprising a plurality of fins arranged in parallel at regular intervals and a tube through which a fluid flows, wherein the fin is provided with a hydrophilic coating on the fins.
A fin-and-tube heat exchanger for an air conditioner, wherein fins provided with an antifouling agent and an antifungal agent are alternately arranged on the hydrophilic coating.