JP2008202860A - Indoor unit of air conditioner, air conditioner and drain water treating method of indoor unit of air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain the deterioration in amenity of an indoor environment generated by drain water generated by condensing by an indoor heat exchanger. <P>SOLUTION: This indoor unit 4 of an air conditioner 2 is composed of the indoor heat exchanger 10, an indoor fan 14 sucking in indoor air and blowing off the air in a room via the indoor heat exchanger 10, a dew receiving pan 34 forming a drain groove 34a receiving the drain water generated by condensing by the indoor heat exchanger 10, and a casing 30 storing these members. Water soluble acrylic resin paint including at least one component of antibacterial, waterproof, heat resistant, rigid and soundproof properties, is sprayed and printed on at least one of an inner wall surface of the drain groove 34a and an inner wall surface of the casing 30, and a recess-projection is formed on a painting surface. Thus, dripping of a water droplet is restrained by enhancing a hydrophilic property of the water droplet 42 on a surface, a malodor is restrained by increasing the action such as the antibacterial property. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an indoor unit of an air conditioner, an air conditioner, and a drain water treatment method for the indoor unit of an air conditioner.

  An air conditioner forms a refrigeration cycle by circulatingly connecting an outdoor unit composed of a compressor, an outdoor heat exchanger, etc., and an indoor unit composed of an expansion valve, an indoor heat exchanger, etc., with refrigerant piping. The air conditioning in the room.

  The indoor heat exchanger acts as an evaporator during the cooling operation, and the indoor air sucked by the indoor fan of the indoor unit is heat-exchanged by the heat exchanger and cooled. At that time, since moisture contained in the air is condensed to generate drain water, a dew receiving tray for receiving this is provided. Such a dew tray is subjected to various surface treatments, for example, to prevent drain water from gradually dipping into a member of the dew plate and dropping into the room.

  For example, in Patent Document 1, a dew receiving tray is formed of a closed cell synthetic resin foam such as a bead fusion-molded foamed polystyrene foam, and a polystyrene sheet vacuum-formed on the surface thereof is integrally molded to form a polystyrene sheet layer. A waterproofing method is described. In addition, a waterproof method in which an acrylic paint using methanol as a solvent is applied to the surface of the dew pan, or a water-resistant coating film is formed by dip-coating a polymer solution obtained by polymerizing vinyl acetate resin in methanol on the surface of the dew pan. The method is described.

JP-A-2-115629

  However, even if any of the processes described in Patent Document 1 described above is performed, the comfort of the indoor environment may be impaired due to the drain water.

  That is, for example, the water droplets of the drain water once dropped on the dew tray are rolled up by the air-conditioning airflow passing through the heat exchanger, causing water splashing, and are scattered into the room together with the air-conditioning airflow from the air discharge port of the indoor unit. It may be damaged. Also, splashed water droplets may not be dropped directly into the room and attached to the inner wall surface of the indoor unit, or water droplets generated on the surface of the heat exchanger may be blown off by the air-conditioning airflow and attached to the inner wall surface of the housing. Although it is conceivable, there is a risk that it will eventually drip into the room through the inner wall surface.

  In addition, for example, miscellaneous bacteria may be generated due to water droplets accumulated in the dew tray, and a bad odor due to the miscellaneous bacteria may impair the comfort of the indoor environment.

  Then, this invention makes it a subject to suppress the deterioration of the comfort of the indoor environment which arises with the drain water which condensed and generate | occur | produced with the indoor heat exchanger.

  In order to solve the above problems, an indoor unit of an air conditioner according to the present invention is condensed and generated by an indoor heat exchanger, an indoor fan that sucks indoor air and blows it out through the indoor heat exchanger, and an indoor heat exchanger. A dew receiving tray in which a drain groove for receiving the drain water is formed, and a housing for housing these. And at least one of the inner wall surface of a drain groove and the inner wall surface of a housing | casing has the coating surface in which the unevenness | corrugation was formed, It is characterized by the above-mentioned.

  That is, as the water droplet approaches a spherical shape, it becomes easier to roll on the surface by the action of external force. Rolling up of water droplets caused by the air-conditioning airflow and dripping of water droplets caused by tapping the inner wall surface of the casing are caused by the ease of rolling.

  Therefore, if irregularities are formed on at least one painted surface of the inner wall surface of the drain groove and the inner wall surface of the housing, the hydrophilicity of the water droplets can be increased, and the water droplets become familiar with the surface and the surface resistance against external force is large. Therefore, rolling can be suppressed. As a result, the water droplets dripped into the drain groove are rolled up by the air-conditioning air current and splashed, or the water droplets attached to the inner wall surface of the housing are prevented from dripping along the surface, thereby reducing the comfort of the indoor environment. It becomes possible to suppress.

  In this case, the unevenness of the painted surface can be formed by spraying paint. In this way, it is possible to form an uneven state with the sprayed paint particles. In particular, by changing the manner of spraying variously, for example, uneven convex portions formed on the painted surface are 0.1 to 1.5 mm in diameter, 35 to 60% in area ratio, and staggered, etc. It is possible to form an optimal uneven state for improving the hydrophilicity of water droplets.

  As the paint, for example, a water-soluble acrylic resin paint can be used, and it is preferable to use a water-soluble acrylic resin paint containing at least one of antibacterial, waterproof, heat-resistant, rigid and soundproof components. . For example, the particles having these components can be blended in a water-soluble acrylic resin paint and used as a paint. By using a paint containing a composite component in this way, for example, the generation of bad odor due to drain water is suppressed by an antibacterial action, or indoor dripping caused by drain water gradually soaking into a member of a dew tray is waterproof. Can be suppressed, and the comfort of the indoor environment can be improved.

  Further, as described above, by forming irregularities on the painted surface, the flow of water droplets on the inner wall surface of the drain groove or the inner wall surface of the casing becomes a meandering state. For this reason, for example, if an antibacterial component is contained in the paint, the antibacterial paint passage distance of water drops increases, the antibacterial action time increases, and the antibacterial action effect can be improved.

  Moreover, the flange part which protrudes toward the center part of a drain groove from a side wall surface can be formed in the side wall surface of a drain groove. Although the water droplet once dripped into the drain groove becomes difficult to splash due to the hydrophilic action due to the above-described uneven shape, it cannot be completely suppressed. In this regard, if the flange portion is formed on the side wall surface of the drain groove corresponding to the outflow side of the air-conditioning airflow, it can guard the water droplets that have been rolled up and fly, and suppress the dripping of the water droplets into the room. it can. In addition, if the flange portion is formed in a portion corresponding to the inflow side of the air-conditioning airflow on the side wall surface of the drain groove, the inflow of the air-conditioning airflow that causes water droplets to be rolled up can be guarded and water jumping can be suppressed. .

  ADVANTAGE OF THE INVENTION According to this invention, the deterioration of the comfort of the indoor environment which arises with the drain water which condensed and generate | occur | produced with the indoor heat exchanger can be suppressed.

  Hereinafter, an embodiment of an air conditioner to which the present invention is applied will be described with reference to FIGS. In the following description, the same functional parts are denoted by the same reference numerals, and redundant description is omitted.

  First, FIG. 1 is an overall configuration diagram showing a refrigeration cycle of the air conditioner of the present embodiment. As shown in FIG. 1, the air conditioner 2 is configured by connecting an indoor unit 4 and an outdoor unit 6 with a pipe 8 that circulates a refrigerant. The indoor unit 4 includes an indoor heat exchanger 10, an indoor expansion valve 12, an indoor fan 14, and the like. The outdoor unit 6 includes a compressor 16, a four-way valve 18, an outdoor heat exchanger 20, an outdoor fan 22, and the like.

  The basic operation of such an air conditioner will be described. For example, during the heating operation, the refrigerant gas compressed by the compressor 16 is guided to the indoor heat exchanger 10 in the indoor unit 4 via the four-way valve 18. The refrigerant gas guided to the indoor heat exchanger 10 is condensed by exchanging heat with the air sent into the room by the indoor fan 14 and then led to the outdoor heat exchanger 20 of the outdoor unit 6 through the expansion valve 12. The refrigerant guided to the outdoor unit 6 exchanges heat with the outside air sent to the outdoor heat exchanger 20 by the outdoor fan 22, evaporates and returns to the compressor 16.

  On the other hand, in the cooling operation, the four-way valve 18 is switched and the refrigerant circulates in the opposite direction. That is, the refrigerant gas compressed by the compressor 16 is condensed in the outdoor heat exchanger 20 of the outdoor unit 6 through the four-way valve 18, and then is transferred to the indoor heat exchanger 10 through the expansion valve 12 of the indoor unit 4. Led. The refrigerant gas guided to the indoor heat exchanger 10 is evaporated by exchanging heat with the air-conditioning airflow sent into the indoor unit 4 by the indoor fan 14 and returned to the compressor 16.

  Then, the indoor unit 4 which is the characterizing part of this invention is demonstrated. FIG. 2 is a perspective view showing the configuration of the indoor unit of the present embodiment, and FIG. 3 is a longitudinal sectional view showing the configuration of the indoor unit of the present embodiment. As shown in FIGS. 2 and 3, in this embodiment, an indoor unit embedded in the ceiling 28 will be described as an example. However, the present invention is not limited to this, and can be applied to, for example, a general household indoor unit. .

  As shown in FIGS. 2 and 3, the indoor unit 4 includes a suction port plate 32, an indoor fan 14, a dew receiving tray 34, an indoor heat exchanger 10, a fan motor 36, and the like housed in a housing 30 having a lower opening. The lower surface opening is covered with the panel 38. The indoor expansion valve 12 may be housed in the housing 30. The dew receiving tray 34 can be formed of a foam such as a closed cell synthetic resin foam.

  When the indoor fan 14 assembled and fixed to the fan motor 36 is rotated by the fan motor 36, the air-conditioning airflow 40 enters from the fan suction port 14a and then flows to the fan discharge port 14b. Pass through and exchange heat. The heat-exchanged air-conditioning airflow 40 is discharged into the room from the air-conditioning outlet 38b via a louver 38a provided on the panel 38.

  Here, drain water generated in the indoor heat exchanger 10 during the cooling operation will be described with reference to FIG. FIG. 4 is an enlarged vertical cross-sectional view of a portion of the dew receiving tray 34 and the indoor heat exchanger 10. As shown in the figure, during the cooling operation, the air-conditioning air flow 40 is cooled by the indoor heat exchange 10, and a part of moisture contained in the air is condensed and attached to the indoor heat exchanger 10. Condensation drops as water droplets 42 and accumulates in a drain groove 34 a formed in the dew receiving tray 34. The drain water accumulated in the drain groove 34a is appropriately treated by being sucked in by a pump device (not shown), for example.

  However, a part of the water droplets 42 accumulated in the drain groove 34a of the dew receiving tray 34 is wound up by the air-conditioning air flow 40 from the indoor fan 14 as shown in the figure, and water splash occurs. And the water droplet which jumped out from the drain groove 34a will be mixed with the air-conditioning airflow 40, and will be scattered indoors from the air-conditioning blower outlet 38b.

  In order to solve such problems, the present embodiment uses a paint in which ceramic beads having antibacterial, waterproof, heat resistant, rigid, and soundproofing components are blended with a water-soluble acrylic resin paint. The paint is sprayed onto the surface of the dew receiving tray 34 including at least the bottom wall surface and the side wall surface of the drain groove 34a. By this spray coating, as shown in FIG. 4, a coated surface having irregularities is formed on the inner wall surface composed of the bottom wall surface and the side wall surface of the drain groove 34a.

  First, by using a paint containing a composite component in this way, for example, germs are propagated by drain water and bad odor is generated, or the drain water gradually soaks into the foam which is a member of the dew tray, It is possible to improve the comfort of the indoor environment by suppressing various harmful effects such as finally dripping indoors. Also, the comfort of the indoor environment can be improved by suppressing noise generated by the fan motor 36, for example, by a soundproofing action.

  Moreover, it can suppress that the water droplet 42 is wound up by the air-conditioning airflow 40 from the drain groove 34a, and dripping it indoors. That is, as the water droplet approaches a spherical shape, the surface easily rolls due to the action of external force, and the roll-up of the water droplet caused by the above-described air-conditioning airflow is due to the ease of rolling. In this regard, in the present embodiment, since the unevenness is formed on the painted surface of the inner wall surface of the drain groove 34a, the hydrophilicity of the water droplet can be enhanced. As a result, the water droplets become familiar with the surface and the surface resistance against the external force increases, so that the rolling can be suppressed to prevent the water droplets from rolling up from the drain groove 34a and scattering into the room.

  Furthermore, in this embodiment, as shown in FIG. 4, the flange 34b which consists of a continuous convex shape along the outer peripheral ridgeline part by the side of the blowing of the air-conditioning airflow 40 of the drain groove 34a which is the position where the water droplet 42 is most easily rolled up is provided. Forming. The flange 34b is formed extending in the center direction of the drain groove 34a. The flange 34b may be formed in advance by forming a member of the dew receiving tray 34 in a convex shape, and spraying and applying a paint thereto, or forming a convex shape by particles of the paint. Thereby, since the water droplet wound up and flew can be guarded with the flange 34b, dripping of the water droplet to a room | chamber interior can be suppressed.

  Further, the flange 34b may be formed along the outer peripheral ridge line portion of the drain groove 34a on the inflow side of the air-conditioned airflow 40, that is, at a position facing the illustrated flange 34b. According to this, since it is possible to guard the inflow of the air-conditioning airflow 40 that causes the water droplets to be rolled up, it is possible to suppress the water droplets from being rolled up and flying.

  Next, surface treatment on the inner wall surface of the housing 30 of the indoor unit 4 will be described with reference to FIG. FIG. 5 is an enlarged schematic view of a part of the housing 30 and the indoor heat exchanger 10. As described above, condensation occurs in the indoor heat exchange 10 during the cooling operation and drops onto the dew tray 34. However, not all water drops drop onto the dew tray 34, and part of the air-conditioning airflow 40 may be scattered as shown in the figure and attached to the inner wall surface of the housing 30, particularly the side wall surface.

  In addition, water drops once dropped on the dew receiving tray 34 may be wound up and scattered by the air-conditioning air flow 40 and attached to the inner wall surface of the housing 30, particularly the side wall surface. Furthermore, water vapor trapped in the housing 30 may be cooled on the ceiling surface of the housing 30, and water droplets may adhere to the ceiling surface.

  Since these water droplets may drip into the room on the inner wall according to gravity, in this embodiment, the same paint as described above is sprayed onto the inner wall surface of the housing 30 as shown in the figure. ing. By this spray coating, a coating surface having irregularities is formed on the inner wall surface composed of the ceiling surface and the side wall surface of the housing 30 as shown in the figure.

  As a result, as in the case of the drain groove 34a described above, the hydrophilicity of the water droplets can be increased, so that the water droplets conform to the surface and the surface resistance against external force increases. Therefore, it is possible to suppress the water droplets from dropping downward into the room after passing down the side wall surface of the casing or directly from the ceiling surface.

  Next, details of the irregularities formed on the inner wall surface of the drain groove 34a and the inner wall surface of the housing 30 will be described with reference to FIGS. FIG. 6 is a schematic plan view of the particle convex portions of the paint formed on the inner wall surface, and FIG. 7 is a schematic vertical sectional view of the particle convex portions of the paint formed on the inner wall surface.

  As shown in FIG. 6, the uneven particle convex portion 44 has a substantially circular shape. And as shown in FIG. 7, it is preferable to adjust spray coating so that the diameter (phi) may be set to about 0.1 mm-1.5 mm. Further, it is desirable to adjust the coating so that the area of the convex portion 44 is about 35 to 60% of the entire area. Furthermore, the hydrophilic effect mentioned above improves further by coating so that the convex part 44 may become a staggered arrangement | sequence like FIG.

  Moreover, as shown in FIG. 6, since the flow of the water droplets 42 is meandering due to the uneven shape of the surface of the drain groove 34a, the paint passing distance of the water droplets 42 is increased. Therefore, if antibacterial and waterproofing components are included in the paint, the time for the antibacterial and waterproofing components to act on the water droplets 42 increases, and as a result, the operational effects such as antibacterial and waterproofing can be improved. .

  In addition, since the coating material used in this embodiment is a water-soluble acrylic resin containing heat resistance, rigidity, and soundproofing components in addition to antibacterial and waterproofing, methanol described in Patent Document 1 of the prior art is used as a solvent. The problem of deterioration of toughness and rigidity of the coating film due to acrylic coating does not occur.

It is a whole lineblock diagram showing the refrigerating cycle of the air harmony machine of this embodiment. It is a perspective view which shows the structure of the indoor unit of this embodiment. It is a longitudinal cross-sectional view which shows the structure of the indoor unit of this embodiment. It is a figure explaining the surface treatment of the dew receiving tray of an indoor unit. It is a figure explaining the inner wall surface treatment of the housing | casing of an indoor unit. It is a plane schematic diagram of the particle | grain convex part of the coating material formed in the inner wall surface. It is a longitudinal cross-sectional schematic diagram of the particle | grain convex part of the coating material formed in the inner wall surface.

Explanation of symbols

2 Air conditioner 4 Indoor unit 6 Outdoor unit 8 Piping 10 Indoor heat exchanger 12 Indoor expansion valve 14 Indoor fan 16 Compressor 20 Outdoor heat exchanger 30 Housing 34 Dew tray 34a Drain groove 34b Flange 40 Air-conditioning airflow 42 Water droplets

Claims (7)

An indoor heat exchanger, an indoor fan that sucks in indoor air and blows it into the room through the indoor heat exchanger, a dew tray in which a drain groove for receiving drain water condensed and generated in the indoor heat exchanger is formed, and these An air conditioner indoor unit comprising a housing for housing
An indoor unit of an air conditioner, wherein at least one of an inner wall surface of the drain groove and an inner wall surface of the housing has a painted surface on which irregularities are formed.   The indoor unit of an air conditioner according to claim 1, wherein the unevenness formed on the painted surface is an unevenness formed by spraying paint.   3. The paint according to claim 2, wherein the paint is a water-soluble acrylic resin paint, and the water-soluble acrylic resin paint contains at least one component of antibacterial property, waterproof property, heat resistance property, rigidity property, and sound insulation property. Air conditioner indoor unit.   The uneven projections formed on the painted surface have a diameter of 0.1 to 1.5 mm, an area ratio of 35 to 60%, and a staggered arrangement. The indoor unit of the described air conditioner.   The indoor unit of an air conditioner according to claim 1, wherein a flange portion is formed on the side wall surface of the drain groove so as to project from the side wall surface toward the central portion of the drain groove.   An expansion valve is provided in the indoor unit of the air conditioner according to any one of claims 1 to 5, and the indoor unit and an outdoor unit having a compressor and an outdoor heat exchanger are connected by a pipe for circulating a refrigerant. An air conditioner that forms a refrigeration cycle. An indoor heat exchanger, an indoor fan that sucks in indoor air and blows it into the room through the indoor heat exchanger, a dew receiving tray in which a drain groove for receiving drain water condensed and generated in the indoor heat exchanger is formed, and these A drain water treatment method for an indoor unit of an air conditioner configured to have a housing containing
At least one of the inner wall surface of the drain groove and the inner wall surface of the housing is spray-coated with a water-soluble acrylic resin paint containing at least one component of antibacterial, waterproof, heat-resistant, rigid and soundproof, A drain water treatment method for an indoor unit of an air conditioner, characterized by forming irregularities on the surface.

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