JP2878391B2 - Air conditioner wind direction changing louver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a louver for changing a wind direction of an air outlet of an air conditioner to be cooled.

[Prior art]

When the air outlet of the air conditioner is being cooled by blowing low-temperature air, the louvers that change the direction of the air are also cooled. When touched, there is a problem that dew forms and the dew adheres, and finally, the dew drops as water drops due to surface tension. To solve this problem, for example,
It has been proposed that fibers are implanted on the surface of an air outlet as disclosed in Japanese Unexamined Patent Publication No. 59-14667 or Japanese Utility Model Application Laid-Open No. 61-130824 to retain dew water and prevent falling. .

[Problems to be solved by the invention]

However, these fiber flocking methods require the use of very expensive short fibers such as nylon resin, acrylic resin, and polyester resin for the flocking member, and when flocking, apply an adhesive by spraying or brushing. After coating with a thermoplastic resin, it is necessary to adhere the flocked member before curing, which makes the process complicated, requires special advanced enforcement technology, and makes it easy for dust to adhere to the flocked louver. Had problems.

[Means for Solving the Problems] In view of the present situation, the present inventors have conducted intensive studies on a coating method for preventing dew condensation that can be inexpensively and easily. As a result, a porous sintered coating using a hydrophilic resin is obtained. It has been found that the object can be achieved by coating, and the present invention has been completed. That is, the present invention is characterized in that the surface of the louver is entirely or partially coated with a porous sintered coating of a hydrophilic resin having a porosity of 8 to 80% and a water droplet absorption time of 300 seconds or less. An object of the present invention is to provide a louver for changing a wind direction at an air outlet of an air conditioner. In the present invention, the wind direction changing louver is a vertical wind direction changing blade that is located at the outlet of the air conditioner body or at the outlet of the low-temperature air attached through a duct and adjusts the wind direction. The porous sintered coating of the hydrophilic resin used in the present invention has a structure in which the surface is continuous with pores and has an affinity for water,
It refers to a hydrophilic resin coating that has the ability to absorb and diffuse water into porous pores. Examples of the hydrophilic resin used include polystyrene, polyvinyl acetate, polyvinyl chloride, polyolefin, polymethyl methacrylate, and acrylonitrile-based resin. A resin having low water absorption performance is subjected to a separate hydrophilic treatment. Preferred are, for example, acrylonitrile resins and polyolefins disclosed in JP-B-63-7211. Of these, high-density polyethylene,
Low-density polyethylene, linear low-density polyethylene, polypropylene, copolymers of olefins and polar vinyl monomers, polyolefins graft-modified with unsaturated carboxylic acids or anhydrides, and combinations of two or more of these However, a powdered material is used, which is hydrophilized. As a raw material to be in a powder state, pulverized products of polymers and pellets of the above-mentioned various polyolefins are used. The particle size of the powder is important because it is a factor that determines the pore size of the porous sintered coating, and the average particle size is 10 to 1000 μ,
The range is preferably from 50 to 700 µ, and particularly preferably from 70 to 350 µ. When the particle size is large, the pore size of the porous sintered coating is large, the smoothness is poor, and the appearance is poor. When the particle size is small, the working environment is poor, which is not preferable. As a method for hydrophilizing, a method for sulfonating a polyolefin powder described in JP-A-57-167330, JP-A-1-65142, and HLB to a polyolefin powder described in JP-A-1-242639. A method of blending a polyhydric alcohol / fatty acid ester or polyether polyol having a value of 1.5 to 12 is employed. The hydrophilicity is represented by an absorption time when a water droplet is dropped on the surface of the porous sintered coating, and the shorter the time, the higher the hydrophilicity performance. It is desirable that the time required for a water droplet of about 0.3 cc to be dropped on the surface of the porous sintered coating and absorbed into the surface of the sintered coating (hereinafter referred to as a water droplet absorption time) is 300 seconds or less. Preferably not more than 240 seconds, more preferably 180
Seconds or less. In the present invention, the method of coating the entire surface or a part of the louver with the porous sintered coating of the hydrophilic resin uses a hydrophilic resin powder, and is a known powder coating processing technique such as a fluid immersion method, an electrostatic method, It can be performed by a thermal spraying method or the like. In particular, the fluid immersion coating method is a preferable coating method because it can easily coat a complicated shape. When the entire surface or a part of the louver is coated with the porous sintered coating of the hydrophilic resin, it is important that the coating is in close contact with the wind direction changing louver. And then entirely or partially covered with a porous sintered film of a hydrophilic resin (so-called two-layer coating). In such a flow dipping coating method, for example, a wind direction changing louver made of metal is previously heated to 20 ° C. or more, preferably 140 to 400 ° C., more preferably 200 to 350 ° C. from the melting point of the hydrophilic resin (preheating), This can be immersed in the powder of the hydrophilic resin flowing in the fluidized tank to adhere the powder, thereby producing a porous sintered coating. In this case, if the heat capacity of the metal wind direction changing louver is sufficient, it may be cooled as it is, or if the powder does not reach a sufficient porous sintered coating, it is further 100 to 350 ° C., preferably 150 ° C. Post-heating is preferably performed at an ambient temperature of up to 300 ° C. The pore diameter of the porous sintered coating is recommended to be in the range of 1 to 500 µ, preferably 5 to 300 µ. The porosity is 8 to 8
0%, preferably 20 to 70%, and the thickness of the porous sintered coating is used in the range of 0.1 to 5 mm, preferably 0.2 to 3 mm.

【Example】

Hereinafter, the present invention will be described specifically with reference to Examples. The porosity, thermal conductivity and water retention referred to in the present invention can be determined by the following methods. Porosity (%) = (ρ ₀ −ρ ₁ ) × 10 ² × 1 / ρ _{0 In the} above formula, ρ ₀ = density of hydrophilic resin ρ ₁ = apparent density of porous sintered coating Thermal conductivity (W / mk) is measured with Kyoto Electronics Manufacturing Co., Ltd. rapid thermal conductivity meter QTM-D3. The amount of water retention is determined by immersing the porous sintered coating in water, taking it out, leaving it to stand for 1 minute, dropping excess water, and measuring the weight before and after immersion in water. Water retention (g) = = (weight after immersion)-(weight before immersion) Example 1 A low-density polyethylene pellet was mechanically pulverized, and hexaglycerol monostearate was added to 100 parts by weight of a powder having an average particle diameter of 250μ. 0.35 parts by weight was mixed and hydrophilized while heating to 85 ° C. with a high-speed mixer to obtain a hydrophilic polyethylene powder. The powder was fluidized in a fluidized vessel, and a 1.6 mm thick, 50 × 1315 mm aluminum wind direction changing louver (shown in FIG. 1) heated to 310 ° C. was immersed in the fluidized vessel for 10 seconds.
After cooling naturally, the entire surface was covered with a porous sintered coating. The coated porous sintered coating has a thickness of 0.8 mm and a water droplet absorption time of 3
Seconds, porosity was 50%, thermal conductivity was 0.89 W / mk, and water retention was 45 g. A wind direction changing louver whose entire surface is covered with a porous sintered coating is placed in an atmosphere at 23 ° C and a humidity of 80%, and a cooling pipe of 5 ° C is applied to one side of the wind direction changing louver, and the dew condensation start time and the dew condensation on the other side are changed. As a result of evaluating the dripping of water, the dew condensation disclosure time was 30 minutes, and the dew water was absorbed into the pores of the porous sintered coating, and no drop of water droplets was observed. Example 2 The same aluminum wind direction changing louver as used in Example 1 was previously subjected to a foam coating of polyethylene by a fluid immersion coating method, and when the polyethylene was still in a molten state,
It was immersed for 15 seconds in a flowing vessel of the hydrophilic polyethylene powder used in Example 1 and then placed in a heating furnace at 180 ° C. for 3 minutes, then cooled naturally, and the entire outer surface was porous sintered by two-layer coating. Covered with a film-like coating. The foam coating is 0.
8mm, coated porous sintered coating is 0.4mm thick, water absorption time 3sec, porosity 50%, thermal conductivity 0.31W / mk, water retention
It was 25 g. This wind direction changing louver was installed in an atmosphere of 23% and humidity of 80%, and a cooling pipe of 5 ° C was applied to one side of the wind direction changing louver to evaluate the dew condensation start time and dew condensation water dripping on the other side. After 45 minutes, the dew water was absorbed into the pores of the porous sintered coating and no drop of water droplets was observed. It was confirmed that by coating the foamed coating with a porous sintered coating, the adhesion of the coating was good, the thermal conductivity was significantly reduced, and the dew condensation was hard to occur. Example 3 In Example 2, instead of coating the entire outer surface with a two-layer coating, a part of the louver (4th
Figure) was coated with a porous sintered coating. The coated porous sintered coating is 0.4mm thick, water absorption time 3 seconds, water retention 1
It was 0 g. This wind direction changing louver was evaluated for dew condensation start time and dew condensation water dripping in the same manner as in Example 2. As a result, the dew condensation start time on the foam coating film was 30 minutes. The water droplets were absorbed into the pores of the porous sintered coating to prevent the water droplets from dropping, and no water droplets were dropped. Example 4 Instead of the hydrophilic polyethylene powder of Example 1, polypropylene was pulverized, and 3 parts by weight of sorbitan monolaurate was added to 100 parts by weight of a powder having an average particle diameter of 500 μ with a high-speed mixer.
Using a hydrophilic polypropylene powder obtained by mixing and hydrophilizing while heating to 90 ° C., the entire surface was coated with a porous sintered coating under the same conditions as in Example 1. The coated porous sintered coating has a thickness of 0.6 mm, a water droplet absorption time of 2 seconds, a porosity of 40%, and a thermal conductivity of 0.1.
2W / mk, water retention 38g. This wind direction changing louver was evaluated for dew condensation start time and dew drop in the same manner as in Example 1. As a result, the dew start time was 25 minutes and the dew water was absorbed into the pores of the porous sintered coating and the No fall was observed. Comparative Example 1 An aluminum wind direction changing louver was heated under the same conditions as in Example 1 except that the hydrophilic polyethylene powder of Example 1 was replaced with powdered polyethylene for fluidized immersion coating.
After immersion for 2 seconds, then put in a heating furnace at 180 ° C for 3 minutes,
It cooled naturally and covered the whole surface with the smooth film. The coating had a thickness of 0.8 mm, a porosity of 0%, and a thermal conductivity of 3.5 W / mk. As a result of evaluating dew condensation start time and dew dropping water in the same manner as in Example 1, dew condensation start time was 3 minutes, dew water was not absorbed by the coating film, and after 30 minutes, water drops were observed as drops. Comparative Example 2 The low-density polyethylene powder used in Example 1 was used without hydrophilization, and the entire surface was covered with a porous sintered coating under the same conditions as in Example 1. The coated porous sintered film had a thickness of 0.8 mm, a porosity of 50%, a thermal conductivity of 0.89 W / mk, a water droplet absorption time of 300 seconds or more, and a water retention of 0 g. As a result of evaluating the dew condensation start time and the dropping of dew condensation water in the same manner as in Example 1, the dew condensation start time was 15 minutes, the dew water was not absorbed by the coating film, and after 60 minutes it was recognized as a water drop and dropped.

【The invention's effect】

According to the present invention, the heat conductivity of the louver surface is significantly increased by coating the entire surface or a part of the surface of the louver at the air outlet of the air conditioner with the porous sintered coating of a hydrophilic resin. In this case, the dew is hardly formed during cooling, and even if the dew is formed, the dew is absorbed into the porous pores, and the large amount of water is retained, so that the drop of water is prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a wind direction changing louver of a general air conditioner, and FIG. 2 is an embodiment in which a porous sintered film of a hydrophilic resin is entirely covered by a line II in FIG. FIG. 3 is an enlarged sectional view of the embodiment in which the two-layer coating is entirely covered by the II line in FIG. 1, and FIG. 4 is an example of the two-layer coating by the II line in FIG. FIG. 5 is an enlarged cross-sectional view of a conventional product, which is a reference example taken along the line II of FIG. 1, with flocking. DESCRIPTION OF SYMBOLS 1 ... Louver for changing wind direction 2 ... Shaft part 3 ... Porous sintered coating of hydrophilic resin 4 ... Coating coating of thermoplastic resin 5 ... Flocked member 6, Adhesive

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Claims (1)

(57) [Claims] 1. The louver is characterized in that the surface of the louver is entirely or partially covered with a porous sintered coating of a hydrophilic resin having a porosity of 8 to 80% and a water droplet absorption time of 300 seconds or less. A louver that changes the air direction at the air outlet of the air conditioner.