JP2009133619A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate a need to clean a blowout air trunk for a long period of time in an air conditioner. <P>SOLUTION: The air conditioner is equipped with a heat exchanger, a filter arranged on its upstream side, a cross flow fan blowing air having passed through the filter so as to carry out heat exchange in the heat exchanger, a scroll part 289 guiding an air current from the cross flow fan, a blowout opening arranged continuous with the scroll part 289, and a wind direction plate arranged on the blowout opening. The scroll part 289 is attached in a structure capable of absorbing a thermal expansion difference to a resin scroll part by superposing a stainless steel plate in an air trunk side of the resin scroll part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an air conditioner, and more particularly to an air conditioner suitable for keeping the inside clean.

  An air conditioner circulates indoor air to a heat exchanger to produce conditioned air that is heated, cooled, or dehumidified, and blows it into the room to make the indoor environment comfortable. At this time, since a filter for removing dust in the circulating air is arranged on the suction side of the heat exchanger, most of the dust in the circulating air is collected by the filter. Dive into the air conditioner.

  The dust collides with every wall facing the air path in the air conditioner, bounces back, and returns to the airflow. The dust that has returned to the airflow returns to the room through the air conditioner outlet. However, some of the dust adheres to the wall without being rebounded due to the influence of electrostatic force, gravity, chemical affinity, and the like. Some dust adheres to the wall due to airflow and other effects within a relatively short period of time, and is carried out of the air conditioner on the airflow. It remains attached. In this way, the physicochemical changes depending on the type of dust after a long time have passed since it adheres, fungi such as fungi such as those that increase adhesion and contained mold grow, and firmly adhere to the wall with their secretions and hyphae Will become attached to. When this happens, the unevenness of the wall surface becomes larger due to the adhering dust, dust in the air is more likely to adhere to the wall due to the viscosity of the secretions, odors are generated from fungi, spores such as mold are scattered, etc. To worsen the indoor environment.

  As a conventional air conditioner for the purpose of internal deodorization, there is one disclosed in Japanese Patent Laid-Open No. 2000-320855 (Patent Document 1). In Patent Document 1, a photocatalyst layer is formed on the surface of aluminum blades in a once-through fan, a light source is disposed inside the once-through fan, and an aluminum or stainless steel foil or thin plate is attached to the resin inner wall of the main body, or plating is performed. It is stated that it is processed to form a reflector.

JP 2000-320855 A

  The air conditioner disclosed in Patent Document 1 uses aluminum blades, so the blade shape cannot be streamlined, and the fan performance is inferior to streamline resin blades. It was. In addition, it is conceivable to form a photocatalyst layer on a streamlined resin blade, but in this case, a problem arises that the resin blade is deteriorated by the photocatalytic action. On the other hand, when an aluminum or stainless steel foil or thin plate is attached to the resin inner wall of the main unit in an air conditioner with a large width, the aluminum or stainless steel may be damaged due to thermal contraction due to the thermal expansion difference between the aluminum or stainless steel and the resin inner wall. was there.

  An object of the present invention is to provide an air conditioner that does not require cleaning of a blowout air passage for a long period of time.

  In order to achieve the above object, a first aspect of the present invention includes a filter disposed upstream of the heat exchanger, and a flow through which air is passed through the filter so as to exchange heat with the heat exchanger. In an air conditioner comprising a fan, a scroll unit that guides an airflow from the cross-flow fan, a blowout port disposed continuously in the scroll unit, and a wind direction plate disposed in the blowout port, the scroll unit Is a structure in which a stainless steel plate is superposed on the air path side of the resin scroll portion and attached with a structure capable of absorbing a difference in thermal expansion from the resin scroll portion.

  In addition, a second aspect of the present invention for achieving the above-described object is that a heat exchanger, a filter disposed upstream of the heat exchanger, and air that has passed through the filter are heated by the heat exchanger. Air provided with a cross-flow fan that blows air to be exchanged, a scroll portion that guides the airflow from the cross-flow fan, a blowout port that is continuously disposed in the scroll portion, and a wind direction plate that is disposed in the blowout port In the conditioner, the wind direction plate includes a vertical direction plate that changes the direction of the air blown from the blowout port during the operation of the air conditioner in the vertical direction and closes the blowout port when the air conditioner is stopped. The vertical direction plate is a stainless steel plate. Is attached to the back side of the resin wind direction plate with a structure capable of absorbing the difference in thermal expansion from the resin wind direction plate.

  ADVANTAGE OF THE INVENTION According to this invention, the air conditioner which does not need the cleaning of a blowing wind path over a long period of time can be provided.

It is a block diagram of the air conditioner which concerns on one Example of this invention. It is the perspective view which removed the makeup | decoration frame of the indoor unit of FIG. 1, and was seen from the left direction. FIG. 3 is a side sectional perspective view of the indoor unit in FIG. 2. It is a figure showing the state which performed the sputtering process to the resin fiber net | network of the filter of FIG. It is a figure showing the state which performed the filter calender row process of FIG. It is a suitable range explanatory drawing of this filter. It is the graph which showed the wire diameter of a filter, and the relationship of opening. It is an antibacterial test result of the resin fiber network which performed the sputtering process of the filter. FIG. 4 is a perspective view of the cross-flow fan of FIG. 3. It is an enlarged photograph of the surface of the once-through fan of FIG. It is a perspective view of the housing | casing of the indoor unit of FIG. It is a disassembled perspective view of the scroll part of the once-through fan air path of the indoor unit of FIG. It is a disassembled perspective view of the surface stainless steel components downstream from the once-through fan of the indoor unit of FIG. It is a sectional side view of the indoor unit of FIG. It is the perspective view which removed the makeup | decoration frame of the indoor unit of FIG. 3, and was seen from the right direction. It is the perspective view which looked at the dew receiving tray of the indoor unit of FIG. 3 from the downward direction. It is the perspective view which looked at the dew receiving tray of the indoor unit of FIG. 3 from upper direction.

  Hereinafter, an air conditioner according to an embodiment of the present invention will be described with reference to the drawings.

  First, the whole structure of the air conditioner 1 of a present Example is demonstrated using FIGS. 1 is a configuration diagram of the air conditioner 1 of the present embodiment, FIG. 2 is a perspective view of the indoor unit 2 of FIG. 1 as seen from the left with the decorative frame 23 removed, and FIG. 3 is a side of the indoor unit 2 of FIG. It is a cross-sectional perspective view.

  In FIG. 1, an air conditioner 1 is configured by connecting an indoor unit 2 and an outdoor unit 6 with a connection pipe 8, and air-conditions the room. A basic internal structure such as a cross-flow fan 311, filters 231 and 231 ′, a heat exchanger 33, a dew tray 35, an up / down wind direction plate 291, and a left / right wind direction plate 295 are attached to the casing 21 of the indoor unit 2. And basic internal structures, such as the cross-flow fan 311 attached inside the housing | casing 21, are enclosed in the indoor unit 2 by attaching the decorative frame 23. FIG. A front panel 25 is attached to the front surface of the decorative frame 23. Below the front panel 25, a display unit 397 for displaying an operation status and a light receiving unit 396 for receiving an infrared operation signal from a separate remote controller 5 are arranged.

  The indoor unit 2 is provided with an air inlet 27 for sucking room air and an air outlet 29 for blowing air in which temperature and humidity are harmonized. Then, the blown airflow from the crossflow fan 311 is caused to flow into a blowout air passage 290 having a width substantially equal to the length of the crossflow fan 311, and the left and right airflow direction plates 295 disposed in the middle of the blowout air passage 290 are deflected in the left-right direction. Further, the vertical airflow direction plate 291 attached to the air outlet 29 deflects the vertical direction of the airflow, and the airflow is blown into the room.

  An air outlet 29 formed on the lower surface of the decorative frame 23 is disposed adjacent to the divided portion with the front panel 25 and communicates with the rear outlet air passage 290. The two up-and-down airflow direction plates 291 substantially conceal the blowing air passage 290 in the closed state, and form a continuous large curved surface on the bottom surface of the indoor unit 2. Then, the vertical wind direction plate 291 is pivoted at a required angle when the air conditioner is operated by the drive motor in response to an instruction from the remote controller 5 with the pivot shafts provided at both ends as fulcrums. Open and hold that state. When the operation of the air conditioner is stopped, the air outlet 29 is controlled to be closed.

  The left and right wind direction plates 295 are configured to be rotatable by a drive motor (not shown) with a rotation shaft provided at the lower end as a fulcrum, and are rotated in accordance with an instruction from the remote controller 5 to maintain the state. Blowing air is blown out in the desired direction on the left and right. By instructing from the remote controller 5, the up and down wind direction plate 291 and the left and right wind direction plate 295 can be periodically oscillated during the operation of the air conditioner, and the blown air can be periodically sent over a wide range in the room.

  Further, the movable panel 251 on the suction side is rotated about a rotation shaft provided at the lower portion by rotating the drive motor. The movable panel 251 opens the front air suction part 230 ′ when the air conditioner is in operation, sucks room air into the indoor unit from the front air suction part 230 ′, and stops the air conditioner when the air conditioner is stopped. Controlled to close '.

And according to the indoor unit 2 which concerns on a present Example, at the time of a stop, the air blowing wind path 290 and the front side air suction part 230 'are concealed with the up-and-down wind direction board 291 and the movable panel 251, and are harmonized with the interior. During operation, the up / down wind direction plate 291 and the left / right wind direction plate 295 are rotated in accordance with an instruction from the remote controller 5. At the same time, the movable panel 251 is opened to suck indoor air from the front air suction portion 230 ′ and the upper air suction portion 230. The sucked indoor air can be blown out from the air outlet 29 by being cooled or warmed by the internal heat exchanger 33.

  When the air conditioner 1 is operated, the power is turned on and the remote controller 5 is operated to perform desired operations such as cooling, dehumidification, and heating.

  In an operation such as cooling, in order to pass room air through the heat exchanger 33 in the front part of the once-through fan 311, the movable panel 251 constituting a part of the front panel 25 is rotated and opened as shown in FIG. 3. The room air is circulated to the heat exchanger 33 through the upper air suction portion 230 and the front air suction portion 230 ′ of the decorative frame 23 behind the opened movable panel 251.

  The indoor unit 2 includes a control board in an electrical component box (not shown) inside, and a microcomputer as a control device is provided on the control board. The microcomputer receives signals from various sensors such as an indoor temperature sensor and an indoor humidity sensor (not shown), and receives an operation signal from the remote controller 5 at the light receiving unit 396, and a cross-flow fan 311, a movable panel drive motor, and a vertical wind direction plate drive. The indoor unit 2 is controlled in an integrated manner, such as controlling the motor, the left and right wind direction plate drive motors, and controlling communication with the outdoor unit.

  The indoor unit 2 is in a state where the operation is stopped, and the movable panel 251 and the up-and-down airflow direction plate 291 are closed as shown by a one-dot chain line in FIG. In this state, when a signal for driving operation is made from the remote controller 5, the microcomputer operates in an operation mode such as cooling or heating based on information from various sensors if the operation signal from the remote controller 5 or automatic operation is set. To decide. Based on this determination, the movable panel 251 and the up / down wind direction plate 291 are operated to open the airflow passage. At this time, the air suction port 230 ′ is opened, but the line of sight from the room is blocked by the movable panel 251 and does not reach the interior of the indoor unit 2, and the indoor atmosphere is not destroyed.

  That is, the microcomputer operates a drive motor (not shown) to rotate the up / down wind direction plate 291 and the left / right wind direction plate 295 to the blowing angle corresponding to the instruction from the remote controller 5. Further, the microcomputer operates a movable panel drive motor that opens the movable panel 251 in conjunction with the operation of the up / down wind direction plate 291.

  Next, the microcomputer rotates the cross-flow fan 311 to suck indoor air from the upper and front air suction portions 230 and 230 ′, and the indoor air is blown into the heat exchanger 33 without hot or cold air or heat exchange. Control is made to blow out from the outlet 29. On the other hand, when stopping the operation, the microcomputer controls the drive motor of the movable panel 251 and the drive motor of the up-and-down air direction plate 291 to reversely rotate after returning the cross-flow fan 311 to return to the closed state.

  The filter 231 is for removing dust contained in the sucked indoor air, and is disposed so as to cover the suction side of the heat exchanger 33. Cross-flow fan 311 is arranged in the center of indoor unit 2 so as to suck room air from air suction port 27 and blow it out from air blowing port 29. The heat exchanger 33 is disposed on the suction side of the cross-flow fan 311 and is formed in a substantially inverted V shape.

  The dew tray 35 is disposed below the lower ends of the front and rear sides of the heat exchanger 33 and receives condensed water generated in the heat exchanger 33 during cooling operation and dehumidifying operation. The condensed water received and collected is discharged to the outside through the drain pipe 37.

  As a result, a main air passage is formed to flow indoor air to be conditioned. That is, by operating the once-through fan 311, the indoor air is sucked from the air suction port 27, exchanged heat with the heat exchanger 33 through the filters 231 and 231 ′, and then blown out into the room from the air outlet 29. Is done.

  Next, the filter 231 will be described with reference to FIGS. FIG. 4 is a diagram illustrating a state in which sputtering processing is performed on the resin fiber net of the filter. FIG. 5 is an explanatory view showing a state in which the resin fiber net of the filter is subjected to sputtering processing and further subjected to calendar roll processing. FIG. 6 is an explanatory diagram of a preferred range of the filter. FIG. 7 is a graph showing the relationship between the wire diameter of the filter and the opening. FIG. 8 shows the antibacterial test results of the resin fiber network subjected to the filter sputtering process.

  If a large amount of dust adheres to the filter 231, it becomes a resistance to the air flow, and the heat exchange performance of the heat exchanger 33 is lowered, so that the capacity of the refrigeration cycle is lowered. For this reason, it is necessary to clean the filter 231 regularly. The filter 231 was cleaned by removing dust using a vacuum cleaner or the like and then applying a detergent or the like to a sponge or soft brush to wash away dust and dirt that could not be sucked.

  In general, the filter 231 is mounted so as to block the entire front surface and upper air suction ports 230 and 230 ′ of the air conditioner 1 that is round, and requires periodic cleaning. Is done frequently. At this time, it is attached and detached so as to slide along an attachment guide to the air conditioner 1. For this reason, both the filter frame 232 and the resin fiber network 231a need to be molded from a resin such as PP, PET, ABS, etc. so that handling at the time of attachment / detachment can be easily performed with a small force and so as not to be broken even by repeated deformation.

  Further, the attachment surface of the resin fiber network 231a with respect to the filter frame 232 may be attached to either the upstream side or the downstream side with respect to the intake airflow of the room air. However, as described above, since the surface of the filter 231 comes into contact with the guide and is easily damaged when the filter 231 is attached or detached for cleaning, a filter frame 232 is attached upstream of the intake air flow of the indoor air, and the resin fiber network 231a. Was prevented from being damaged.

  Further, the net of the conventional filter 231 is a surface on which a resin such as PP, PET, or ABS is exposed. The method of forming the mesh constituting the filter 231 is a technique in which a melted resin is injected from a nozzle and cooled and cured. For this reason, the net surface on which the resin is exposed has many pores even if it looks smooth. Since dust or cigarette smoke floating in the air adheres to these pores and enters the pores, dirt such as dust that has entered the pores can be easily cleaned even if the filter 231 is periodically cleaned. I can't drop it.

  In addition, a net made of resin fibers has a thin wire diameter and is easily damaged when rubbed. For this reason, it is necessary to remove dust even when swept with a soft brush. In recent years, with the increasing awareness of cleanliness, tools such as hand mops that can be easily cleaned have been released, and there has been a need to use hand mops to wipe off dirt. In addition, a cleaning mechanism that automatically absorbs dirt on the filter has been developed. The suction force of this cleaning mechanism is much weaker than a vacuum cleaner that cleans the floor. It is necessary to remove the dirt on the filters 231 and 231 'even with such a weak suction force. Thus, there is a need for a filter 231 that can remove dirt by removing the dirt attached to the filter 231 even if the filter 231 is swept by a weak force.

  In addition to such cleanliness, safety is also increasing, and among them, the market for antibacterial processed products with antibacterial functions is expanding year by year. In recent years, with an increase in the airtightness of houses, it has become a living environment where bacteria can easily propagate due to increased humidity and insufficient ventilation. In order to realize a comfortable and hygienic living environment, antibacterial needs for air conditioners are also increasing.

  As shown in FIG. 3, the filter 231, 231 ′ of the present embodiment includes resin fiber nets 231 a, 231 a ′ and filter frames 232, 232 ′ for supporting and fixing the resin fiber net 231 a. The resin fiber network 231a of the conventional filter 231 is a surface on which a resin such as PP, PET, ABS or the like is exposed, and the resin is exposed because the resin molding method injects the molten resin from the nozzle and cools and cures. Even though the surface looks smooth, it has many pores. Since dust or cigarette smoke floating in the air adheres to these holes and enters the pores, even if the filter 231 is cleaned frequently, dirt such as dust that has entered the pores cannot be removed.

  Therefore, as shown in the cross-sectional view of the resin fiber network 231a shown in FIG. 4, an inert gas such as argon gas ionized in a vacuum is collided with a metal such as stainless steel, and the repelled metal particles are formed on the resin fiber network 231a. A metal film 231d such as stainless steel is formed on the surface of the resin fiber network 231a by sputtering. Thereby, the pores on the surface of the resin fiber network 231a are filled and the surface is smoothed with a nano size, so that dust and dirt can be easily peeled off, and the penetration of dirt can be prevented.

  Here, the surface to be sputtered is applied to the entire surface of the resin fiber network 231a on both the upstream and downstream sides of the intake air flow of the room air, thereby further improving dust releasability and suppressing dirt permeability. However, a sufficient effect can be obtained only by processing upstream of the intake airflow of the room air, and the cost can be reduced.

  Further, as shown in FIG. 5, by applying a calender roll process in which the resin fiber net 231a is crushed with a roller while applying heat, a plane portion can be formed at the intersection of the vertical fibers 231b and the horizontal fibers 231c. By further smoothing 231a, dust can be easily peeled off.

  In addition, the resin filter 231 is used, and the migration of the resin component that occurs when a soft resin cleaning tool such as a sponge, brush or hand mop is brought into contact with the resin fiber net 231a for a long time is prevented at the stainless steel sputtering part. In addition, there is no risk of problems such as roughening of the filter 231 surface and deformation of the hair tips.

  Here, in FIG. 6, the pitch of the resin fiber network 231a is plotted on the horizontal axis and the wire diameter is plotted on the vertical axis, and the permissible range of aperture ratio, mesh strength, and mesh opening is shown. The net strength can be increased by increasing the wire diameter. In order to perform cleaning properly, the net strength needs to be 8.5 N / cm or more. If the mesh strength is insufficient, the deformation of the filter 231 increases, and a portion that cannot be swept out is generated during cleaning, so that unswept portions can be left.

  Moreover, in order to ensure the pressure loss of the air conditioner 1, the opening ratio of the mesh in the whole area of the resin fiber network 231a must be 55% or more. This is because the filter 231 for the air conditioner is mainly intended to remove relatively large dust that clogs the heat exchanger 33. Therefore, it cannot be set to an aperture ratio that reduces the capacity of the heat exchanger 33. When the aperture ratio is determined, if the wire diameter of the wire is increased, the mesh opening (the distance between the yarns of the resin fiber net 231a, the size of the mesh) is widened, and large dust passes. FIG. 7 shows the relationship between the wire diameter and the opening at the opening ratio of 60%.

  The following can be understood from FIGS. If the aperture ratio is kept constant and the wire diameter is increased, the strength of the net 231a is improved, but the opening becomes large and large dust passes. On the contrary, if the wire diameter is reduced, the mesh opening is reduced, but this time the strength of the mesh 231a is lowered and the mesh is greatly deformed.

  For example, when the wire diameter exceeds 230 μm, the strength of the mesh 231a of the filter 231 is good, but the mesh opening is 800 μm, and the dust collection efficiency is lowered.

  For this reason, when the wire diameter of the filter 231 is set to 230 μm, dust of 800 μm or less passes through the mesh of the filter 231 in principle. However, a long fiber (waste thread) of 800 μm or more adheres to the filter 231, and the attached lint can be collected with fine dust, but it is not preferable to pass dust of 800 μm or more. . In general, the distance between the fins of the heat exchanger 33 is about 1.2 mm, and 800 μm is dust having a size of 67%, which is larger than 65% of the gap between the fins. It is difficult for such large dust to pass between the two fins at the same time, causing the heat exchanger 33 to be clogged. Therefore, in this example, the opening 765 μm calculated with the wire diameter of 220 μm at the lower stage was set as the upper limit of the opening. This is 64% of the distance between the fins.

  Therefore, it is desirable that the resin fiber network 231a has a tensile strength of 8.5 N / cm or more, an opening ratio of 55% or more, and an opening of 765 μm or less.

  If the tensile strength of the resin fiber network 231a is less than 8.5 N / cm, the strength of the resin fiber network 231a is insufficient, and the resin fiber network 231a is liable to be bent, resulting in an obstacle to cleaning. Taking the case where the material of the resin fiber network 231a is polyethylene terephthalate as an example, and this is shown in FIG. 6, the preferred range is the upper range of the A curve. In addition, the curve of A goes up and down depending on the material of the resin fiber network 231a, and generally changes according to the tensile strength of the material.

  If the opening ratio is less than 55%, the increase / decrease in the speed of the airflow passing through the resin fiber network 231a is large, and the ventilation resistance increases. A preferable range is shown in FIG.

  If the mesh size exceeds 765 μm, dust caught between the fins of the heat exchanger 33 passes through the filter 231, which is inconvenient. Also, if the opening is large, when cleaning automatically, the cleaning tool moves swiftly over each resin fiber and cannot move smoothly, causing noise and vibration. Do not let it fall and get dirty around it. A preferred range is shown on the left side of the C curve in FIG.

  As described above, a preferable range of the resin fiber network 231a is a region surrounded by the curves A, B, and C in FIG. Thus, by setting the mesh strength to 8.5 N / cm or more, opening 765 μm or less, and opening ratio 55% or more, a filter that keeps the mesh strength suitable and does not allow large dust to pass through and has good dust separation and dirt removal. 231 can be provided.

  The sputtering process and the calender roll process may be applied to either a honeycomb weave or a plain weave, which is a general structure of the resin fiber network 231a.

  Here, if the structure of the resin fiber network 231a is a three-dimensionally woven honeycomb structure, dust is likely to collide with the resin fiber network 231a and the dust collecting efficiency is high. However, since it is not smooth, the dirt is wiped off with a cleaning tool. However, dust remains in the concave and convex portions.

  Therefore, by making the structure of the filter 231 into a plain weave structure, the surface of the filter 231 can be made smoother and easier to clean.

  Further, the attachment surface of the resin fiber network 231a with respect to the filter frame 232 may be attached to either the upstream side or the downstream side with respect to the intake airflow of the room air. However, the filter 231 is mounted so as to block the entire air suction ports 230, 230 ′ on the front and upper surfaces of the air conditioner 1 that is generally round, and requires periodic cleaning, so that it can be attached and detached by the user. Work is done frequently. At this time, the filter 231 is attached and detached so as to slide along the attachment guide to the air conditioner 1, but the surface of the filter 231 comes into contact with the guide and is easily damaged. Therefore, the filter frame 232 is attached to the upstream side of the intake airflow of the indoor air. The fiber net 231a was prevented from being damaged.

  As in the embodiment, at least sliding portions of the resin fiber nets 231a and 231a ′ that are in contact with the guide can be protected by the metal film 231d by sputtering, and the resin fiber nets 231a and 231a ′ are damaged. Further, since the filter frame 232 can be arranged downstream of the intake airflow of the room air, there is an advantage that the unevenness due to the filter frame 232 is eliminated on the surface to which dust adheres and cleaning is easy. is there.

  FIG. 8 shows the results of the antibacterial performance evaluation of the resin fiber net 231a obtained by sputtering stainless steel and the resin fiber net 231a not subjected to sputtering according to JISZ2801. This measurement was performed by a public organization.

  According to this result, it was found that the antibacterial activity value of Staphylococcus aureus and Escherichia coli satisfies the standard value of 2.0 or more, and the effect of suppressing the growth of the bacteria can be obtained. As a result, an antibacterial effect can be obtained by forming a stainless steel metal film 231d on the surface of the resin fiber net 231a by sputtering, and a comfortable and hygienic living environment corresponding to antibacterial needs for safety-oriented in recent years. An air conditioner can be provided to achieve this.

  Next, the cross-flow fan 311 will be described with reference to FIGS. FIG. 9 is a perspective view of the cross-flow fan 311 and FIG. 10 is an enlarged photograph of the cross-flow fan surface comparing the presence or absence of sputtering of stainless steel.

  In general, the indoor unit 2 of the air conditioner 1 uses a cross-flow fan 311 driven by a blower motor 313. The blade shape of the blade 311a is devised to reduce blowing noise, and the tip of the blade shape is rounded. And the rear portion is tapered to form a so-called streamline. In order to do this, the cross-flow fan 311 is made of synthetic resin and molded by a method such as injection molding to obtain a blade 311a having a desired airfoil shape.

  However, a molding method using a synthetic resin is a technique in which a melted resin is injected from a nozzle and cooled and cured, so that the exposed surface of the resin has many pores even if it looks smooth. In particular, the cross-flow fan 311 is required to have the blade 311a as thin as possible in terms of performance, and is required to withstand the centrifugal force and to be strong because it rotates at a high speed. For this reason, adding glass fiber etc. to a molding material and raising intensity | strength is performed. As described above, a molded product using a resin reinforced with glass fiber or the like has irregularities on its surface and further increases pores. Dust floating in the air adheres to these pores, enters the pores, and the dust that has entered the pores cannot be easily dropped. As described above, the dust adhering to the resin surface adheres more firmly as time passes, and accumulates on the cross-flow fan 311 to scatter mold spores or generate malodor. To come.

  Further, since the cross-flow fan 311 has a large number of the above-described streamlined airfoil-shaped blades 311 a arranged at a narrow interval, when cleaning these blades, the blades 311 a must be wiped one by one. In addition, there is a possibility that the blade 311a is deformed or folded. Further, since the cross-flow fan 311 has a horizontally long shape, it is often twisted and deformed during handling during cleaning, and in such a case, the rotational balance of the cross-flow fan 311 is lost and is incorporated into the indoor unit 2. When driving with a large vibration. Thus, it is difficult to clean the once-through fan 311.

  In this embodiment, the cross-flow fan 311 is made of resin and is subjected to stainless steel sputtering. In the sputtering process, as described above, the stainless steel particles pour down without directivity, so that a thin layer of stainless steel is formed over the entire circumference of the blade surface of the blade 311a of the cross-flow fan 311.

  Specifically, the cross-flow fan 311 includes a plurality of discs 311b provided at intervals in the axial direction, a plurality of blades 311a extending between the discs 311b and provided along the periphery of the disc 311b, And a boss attached to one of the disks 311b via a rubber member 311c. The disc 311b and the blade 311b are formed by sputtering stainless steel with the rubber member 311c masked on the surface of the resin base material. As a result, the reliability of the rubber member 311c is not reduced.

  As shown in FIG. 10, when the sputtering of stainless steel is performed, the pores on the surface of the once-through fan 311 are filled, the unevenness is reduced, and the surface roughness of the surface is reduced from 6.0 μm to 2.8 μm and smoothed. As a result, the number of pores into which dust enters is reduced and it is difficult to adhere. In addition, since dust that has barely entered the pores is not close to other pores, it is easily peeled off with a little force, and is blown away by the airflow generated when the cross-flow fan 311 rotates. In this way, the attached dust immediately peels off, and the antibacterial action of the stainless steel sputtering film suppresses the growth of mold and the like contained in the dust, and the mycelia are stretched and fixed to the cross-flow fan 311. Disappear. Moreover, since dust does not accumulate on the surface of the cross-flow fan 311, the aerodynamic performance of the cross-flow fan 311 is maintained, and no increase in noise or reduction in the air volume is caused.

  Next, the scroll part 289 downstream of the once-through fan 311 will be described with reference to FIGS. 11 is a perspective view of the casing, FIG. 12 is a perspective view of the scroll portion of the cross-flow fan air passage, FIG. 13 is an exploded perspective view of the surface stainless steel component downstream from the cross-flow fan, and FIG. 14 is a side sectional view of the indoor unit. .

  As shown in FIG. 11, the scroll portion 289 downstream of the cross-flow fan 311 is formed so as to smoothly continue downward from the rear edge 287 provided in the casing 21 so that airflow is stably blown out from the cross-flow fan 311. Has been. As the scroll portion 289 approaches the trailing edge 287, the distance from the blade 311a of the cross-flow fan 311 is reduced, and it is difficult to insert the finger of the hand for cleaning. There is a high risk of deforming the blade 311a.

  In this embodiment, the scroll portion 289 is configured by superposing a stainless steel plate on the air path side of the resin scroll portion continuing downward from the rear edge 287. The stainless plate is attached at a plurality of locations by an attachment structure capable of absorbing the difference in thermal expansion from the resin scroll portion. Specifically, this mounting structure is such that a screw is passed through the stainless steel plate from the air passage side and screwed into the resin scroll portion, a washer is interposed between the stainless steel plate and the screw head, and a screw through hole in the stainless steel plate is provided. The structure is larger than the outer diameter of the screw. This makes it possible to absorb the difference in thermal expansion between the stainless steel plate and the resin scroll, even if there is a change in indoor temperature, a change in ventilation air temperature due to cooling operation or heating operation, and a fixed state that maintains reliability. Can be maintained.

  The stainless steel plate makes the scroll portion 289 a smooth metal surface, making it difficult for dust to adhere to it, and even if it adheres, it will be blown away by the airflow generated when the cross-flow fan 311 rotates. In this way, the attached dust immediately peels off and the antibacterial action of stainless steel suppresses the growth of mold and the like contained in the dust. In addition, since dust does not accumulate on the surface of the scroll portion 289, the resistance of the ventilation path does not increase, the aerodynamic performance of the cross-flow fan 311 is maintained, and no increase in noise or reduction in the air volume occurs.

  Further, the casing 21 is made of resin, and a scroll portion 215 is also provided on the casing 21. A stainless steel scroll portion 289 as shown in FIG.

  Thereby, because of the complicated shape, the air passage surface of the casing 21 formed by molding the resin is covered with the stainless steel plate, so that the same effect as described above is produced. Furthermore, since the housing | casing 21 is reinforced with a stainless steel plate, the housing | casing 21 becomes strong and becomes easy to transport and handle. Further, since the back of the stainless steel plate is also made of the resin of the housing 21, heat conduction is suppressed compared to the stainless steel plate, and less heat is wasted away. In addition, since no opening is provided on the back surface of the stainless steel plate, conditioned air does not leak from between the stainless steel plate and the housing 21, and no dew is formed around the leak and heat is not wasted.

  Next, the air outlet 29 of the indoor unit 2 will be described with reference to FIGS. FIG. 15 is a perspective view of the indoor unit 2 as seen from the right side with the decorative frame 23 removed, FIG. 16 is a perspective view of the dew tray 35 viewed from below, and FIG. 17 is a perspective view of the dew tray 35 viewed from above. .

  In general, the air outlet 29 of the air conditioner 1 is a portion that is seen by the user when the air conditioner 1 is used, and therefore needs to have a flowing shape that uses many curves. The upper wall 290a of the blowout air passage 290 continues from the front edge 286 of the cross-flow fan 311 and receives the lower surface 35b of the dew receiving tray 35 of the condensed water provided under the heat exchanger 33 and the upper edge 290d of the outlet. Followed by a ceiling surface 290e. The lower wall 290b of the blowout air passage 290 includes a scroll front end 298, a wind direction plate base 294 that supports the left and right wind direction plates 295, and the like. The left and right side walls 290c and 290c ′ of the blow-out air passage 290 connect the upper wall 290a of the blow-off air passage formed by the bottom surface 35b of the dew tray 35 and the ceiling surface 290e and the wind direction plate base 294, and the axis of the vertical wind direction plate 291. It is comprised by the connection part 297 provided with the branch part. In the blowout air passage 290, an up / down wind direction plate 291, a left / right wind direction plate 295, an intermediate connection portion 297 a that connects the lower surface 35 b of the dew tray 35 and the wind direction plate base 294, and the like are provided. As described above, in addition to the complicated shape, it is necessary to reduce the dew caused by the cool air during cooling. Therefore, the components of the outlet are often injection-molded with resin.

  A mounting portion 297b of an up / down air direction plate motor 111 for driving the up / down air direction plate 291 is provided on the outer side of one side of the side walls 290c, 290c 'of the blowout air passage 290. At the upper surface of the ceiling surface 290e and the front surface of the dew tray 35, there are provided mounting portions 35c such as display-related electrical products.

  In this embodiment, the upper wall 290a (the bottom surface 35b and the ceiling surface 290e) of the blowing air passage, the lower wall 290b (the scroll tip 298, the wind direction plate base 294) of the blowing air passage, and the left and right side walls 290c and 290c of the blowing air passage. A metal film is formed by performing sputtering of stainless steel on a part made of resin facing the blowout air passage 290 such as' (connecting portion 297).

  Thereby, the pores on the surface of the outlet 29 are filled and the surface is smoothed, so that the pores into which dust enters are drastically reduced and are difficult to adhere. The dust that has barely entered the pores is not easily close to other pores, so it is easy to peel off with a little force, and is blown away by the airflow generated when the cross-flow fan 311 rotates. In this way, the attached dust immediately peels off, and the antibacterial action of the stainless sputtering film suppresses the growth of mold and the like contained in the dust, so that the mycelia are not stretched and fixed to the outlet. . Further, since dust does not accumulate on the surface of the blowout port, the resistance of the blowout air passage 290 does not increase, the aerodynamic performance of the cross-flow fan 311 is maintained, and no increase in noise or reduction in the air volume is caused.

Here, the parts that should not be subjected to the sputtering of stainless steel will be described. Generally, when the air conditioner 1 is grounded, the heat exchanger 33 is configured to have this ground potential. This is because the heat exchanger 33 is a component of the refrigeration cycle and is connected from the indoor unit 2 to the outdoor unit 6 by the refrigerant pipe 8, so that it can be easily contacted with the ground terminal, and the indoor unit 2 and the outdoor unit 6. This is because the refrigerant pipe 8 connecting the two can be used as a ground conductor. In general, electrical parts are grounded at the same potential as the ground terminal of the main body. As described above, since the ground potential of the electric product is the same as the ground potential of the heat exchanger 33, when the ground of the main body of the air conditioner 1 is incomplete, the electrostatic potential of the heat exchanger 33 is caused by the stray capacitance. In such a case, even if the heat exchanger 33 is touched, the energization amount without any danger is limited.

  However, in recent years, small pulse motors have been widely used as actuators for driving various components. For example, a motor 111 that drives the vertical wind direction plate 291, a motor that drives the left and right wind direction plates 295 separately for the left and right blocks, movable A motor for driving the panel 251 is used. These are driven by a low-voltage DC power supply and have a short insulation distance. For example, when the outer casing becomes a high potential of 100V, electric discharge occurs between the outer casing and the internal terminals, and the noise easily leads. There is a risk that it will be transmitted to the electronic parts that control the motor through the wire, causing a discharge again at a short insulation distance, or causing a malfunction.

  In the present embodiment, the parts that form the outlet 29 do not have a stainless steel sputtering part on the surface having the receiving part 35a that receives the condensed water flowing down from the heat exchanger 33 or the electrical product mounting part.

  Thereby, even when the main body of the air conditioner 1 is incompletely grounded, the ground potential of the heat exchanger 33 remains up to the condensed water in the saucer portion 35a, and the blowout air from the saucer lower surface 35b subjected to the stainless sputtering is applied. The road wall 290a is not reached. Further, since the stainless steel sputtering is not applied to the mounting surface of the electrical product, it is possible to prevent noise from getting on the outer casing of the electrical component and to prevent malfunction.

  For this reason, an electrostatic shock can be avoided even if the hand is touched to the blowout port to which stainless steel is sputtered.

  Next, the wind direction plate 291 will be described with reference to FIG. The vertical wind direction plate 291 is configured by superposing a stainless plate 291a on the back side of the resin wind direction plate 291b. The stainless steel plate 291a makes the wind direction plate 291 a metal smooth surface, making it difficult for dust to adhere, and even if it adheres, it is blown away by the airflow that occurs when the once-through fan 311 rotates. In this way, the attached dust immediately peels off and the antibacterial action of stainless steel suppresses the growth of mold and the like contained in the dust. Further, since dust does not accumulate on the surface of the wind direction plate 291, the resistance of the ventilation path does not increase, the aerodynamic performance of the cross-flow fan 311 is maintained, and the increase in noise and the decrease in the air volume are not caused.

  The stainless steel plate 291a is attached by a structure capable of absorbing a difference in thermal expansion from the resin wind direction plate 291b. Specifically, this attachment structure is attached so that one end of the stainless steel plate 291a is bent in a hook shape and sandwiches one end of the resin wind direction plate 291b, and the other end of the stainless steel plate 291a is It is a structure that is folded back and formed in a double shape, and the folded front end is locked to a step formed near the other end of the resin wind direction plate 291b. This makes it possible to absorb the difference in thermal expansion between the stainless steel plate and the resin scroll, even if there is a change in indoor temperature, a change in ventilation air temperature due to cooling operation or heating operation, and a fixed state that maintains reliability. Can be maintained.

  Note that a metal film may be formed by sputtering stainless steel on the wind direction plates 291 and 295. As a result, the pores on the surfaces of the up-and-down wind direction plate 291 and the left-and-right wind direction plate 295 are filled and the surface is smoothed, so that the pores into which dust enters are drastically reduced and are difficult to adhere. The dust that has barely entered the pores is not easily close to other pores, so it is easy to peel off with a little force, and is blown away by the airflow generated when the cross-flow fan 311 rotates. In this way, the attached dust immediately peels off, and the antibacterial action of the stainless sputtering film suppresses the growth of mold and the like contained in the dust, and the mycelium is extended to extend the vertical wind direction plate 291 and the left and right wind direction plates. It will not stick to 295. Further, since dust does not accumulate on the surfaces of the up / down wind direction plate 291 and the left / right wind direction plate 295, the resistance of the ventilation path of the up / down wind direction plate 291 and the left / right wind direction plate 295 does not increase, and the aerodynamic performance of the cross-flow fan 311 is maintained, and noise. There is no increase in airflow or airflow.

  DESCRIPTION OF SYMBOLS 1 ... Air conditioner, 2 ... Indoor unit, 5 ... Remote control, 6 ... Outdoor unit, 8 ... Connection piping, 21 ... Housing, 23 ... Cosmetic frame, 25 ... Front panel, 27 ... Air inlet, 29 ... Air blowing Mouth, 33 ... heat exchanger, 35 ... dew tray, 35a ... tray portion, 35b ... bottom surface of tray, 35c ... electrical product mounting portion, 37 ... drain pipe, 111 ... vertical wind direction plate motor, 215 ... scroll portion of housing, 230, 230 '... Air suction part, 231, 231' ... Filter, 231a, 231a '... Resin fiber network, 231b ... Longitudinal fiber, 231c ... Horizontal fiber, 231d ... Metal coating, 232, 232' ... Filter frame, 251 ... Movable panel, 286 ... front edge, 287 ... rear edge, 289 ... scroll unit, 290 ... blower air passage, 290a ... blower air passage upper wall, 290b ... blower air passage lower wall, 290c ... blower air passage side wall, 290d Upper edge of opening, 290e ... Ceiling surface, 291 ... Up / down wind direction plate, 294 ... Wind direction plate base, 295 ... Left / right wind direction plate, 297 ... Connection portion, 297a ... Intermediate connection portion, 298 ... Scroll tip portion, 311 ... Cross-flow fan, 311a ... blades, 313 ... blower motor, 396 ... light receiving part, 397 ... display part.

Claims (2)

A heat exchanger, a filter disposed upstream of the heat exchanger, a cross-flow fan that blows air so that the air that has passed through the filter is heat-exchanged by the heat exchanger, and an air flow from the cross-flow fan are guided. In an air conditioner including a scroll unit, a blowout port arranged continuously in the scroll unit, and a wind direction plate arranged in the blowout port,
The air conditioner is characterized in that the scroll portion is attached with a structure capable of absorbing a difference in thermal expansion from the resin scroll portion by superimposing a stainless steel plate on the air path side of the resin scroll portion. A heat exchanger, a filter disposed upstream of the heat exchanger, a cross-flow fan that blows air so that the air that has passed through the filter is heat-exchanged by the heat exchanger, and an air flow from the cross-flow fan are guided. In an air conditioner including a scroll unit, a blowout port arranged continuously in the scroll unit, and a wind direction plate arranged in the blowout port,
The wind direction plate is provided with a vertical wind direction plate that changes the wind direction blown from the blowout port during operation of the air conditioner to the vertical direction and closes the blowout port when the air conditioner is stopped. The vertical wind direction plate is made of a stainless steel plate as a resin wind direction plate. An air conditioner mounted on a back surface of the air conditioner so as to absorb a difference in thermal expansion with the resin wind direction plate.

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