JP2015169422A - air conditioner indoor unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the dew formation on the inner wall surface of an intake air duct 16 for introducing indoor air drawn in from a second inlet port 14 in the bottom surface of a casing to the upstream side of a heat exchanger 2 during cooling operation and to keep clean the inner wall surface of the intake air duct 16.SOLUTION: An air conditioner indoor unit comprises: a second inlet port 14 formed in rear of a blowout port 4 and opening to a bottom surface of a casing 2; a blowout air duct 6 whose rear surface is partitioned by a blowout air duct wall 7; an intake air duct 16 which is formed in rear of the blowout air duct wall 7 and in which indoor air drawn in from the second inlet port 14 flows up to an upstream side of a heat exchanger 2; and a heat insulating material 20 installed in contact with the rear surface of the blowout air duct wall 7, and further comprises a resin heat insulating material cover 21 provided in rear of the heat insulating material 20 and non-foam molded to cover the rear surface of the heat insulating material 20.

Description

  The present invention relates to an indoor unit of an air conditioner, and more particularly to an indoor unit of an air conditioner that is a wall-hanging type and has a second suction port on the bottom surface of a housing.

  In a separate type air conditioner indoor unit having an outdoor unit and an indoor unit, most of the wall-mounted indoor units installed at the upper part of the wall surface of the air-conditioned room have room air on the upper surface of the casing of the indoor unit. A suction port is formed to serve as an inlet. And it has a heat exchanger and an indoor fan inside the housing, and the indoor air led from the suction port on the upper surface to the inside of the housing by rotation of the indoor fan is cooled and warmed by the heat exchanger to make conditioned air, It blows out into the room from a blowout port formed on the front side of the lower part of the housing.

  The conditioned air blown out from the outlet during the cooling operation is cooler than the room air and has a higher specific gravity than the room air, and therefore tends to move to the lower side of the room. Therefore, in order to improve the circulation of air in the air-conditioning target room during cooling operation, in addition to the suction port on the top surface of the casing (hereinafter referred to as the first suction port), the rear side (wall surface) There is also an indoor unit in which a second suction port is formed at a position that is closer to the rear. (For example, refer to Patent Document 1.)

  The second suction port on the bottom surface of the housing is provided with an opening / closing plate that rotates to open or close the second suction port. Then, on the back side of the blowout air passage that guides the air that has passed through the heat exchanger to the blowout port, the second suction port and the upstream space of the heat exchanger inside the housing are separated by a blowout airway wall. A suction air passage that communicates is formed.

  The suction air passage is adjacent to the blow air passage in the front-rear direction of the indoor unit with a blow air passage wall serving as a partition on the back side of the blow air passage. For this reason, the front surface of the blowing air passage wall faces the blowing air passage, and the rear surface, which is the back surface thereof, faces the suction air passage.

  The room air sucked from the second suction port by the rotation of the indoor blower fan flows upward through this suction air passage and flows into the upstream space of the heat exchanger, where the room air sucked from the first suction port Merges with air and passes through the heat exchanger. The room air after exiting the suction air passage passes through an air filter covering the upstream side of the heat exchanger before passing through the heat exchanger. Thereby, the dust contained in the air is captured by the air filter.

JP 2012-220062 (columns 0038 to 0044, columns 0054 to 0061, FIGS. 1 and 5)

  In an indoor unit of an air conditioner having a suction air passage across a blowout air passage wall on the back side of a blowout air passage as shown in Patent Document 1, the air conditioner is cooled by a heat exchanger during cooling operation, However, since the conditioned air whose temperature has decreased flows through the blowing air passage, the blowing air passage wall is also cooled by the conditioned air. As a result, water vapor contained in the indoor air flowing through the suction air passage facing the back of the blowout air passage wall is cooled and condensed by the blowout air passage wall, and water droplets (condensation) form on the back of the blowout air passage wall. It adheres as water).

  In this way, during cooling operation or dehumidifying operation, moist room air sucked from the second suction port may cause dew condensation on the inner wall surface of the suction air path, so the attached dew condensation water falls outside the indoor unit. There was a problem that it had to be equipped with a means to avoid.

  In addition, since the indoor air guided into the housing from the second suction port passes through the air filter after passing through the suction air passage, the inner wall surface of the suction air passage is included in the indoor air before passing through the air filter. There was a problem that dust adhered.

  In addition, the second suction port on the bottom surface of the housing has the effect of eliminating the stagnation of cool air during cooling operation and improving the circulation of indoor air, but the second suction port on the bottom surface of the housing is not effectively used during heating operation. There was a problem.

  The present invention has been made to solve the above-described problems, and is a suction air passage that guides indoor air sucked from the second suction port on the bottom surface of the housing to the upstream side of the heat exchanger during cooling operation. An object of the present invention is to provide an indoor unit of an air conditioner that can prevent condensation on the inner wall surface and can clean the inner wall surface of a suction air passage.

  Moreover, this invention can blow out the warm air of the temperature which a user desires from a blower outlet in a short time from the operation start instruction of a user (user) at the time of heating operation using the 2nd suction inlet of a housing | casing bottom face. An object of the present invention is to provide an air conditioner indoor unit.

  An indoor unit of an air conditioner according to the present invention includes a housing having a first suction port on an upper surface and a blower port on a lower portion on the front side, a blower fan inside, and a heat exchanger disposed on the upstream side of the blower fan. A body, a second suction port that opens to the bottom surface of the housing behind the blower port, a blower air passage that extends from the blower fan to the blower port and is partitioned on the back side by a blower air channel wall, and the interior of the housing Is formed behind the blowout air channel wall and guides the indoor air sucked from the second suction port to the upstream side of the heat exchanger, and the blowout air between the blowout air channel wall and the suction air channel. And a heat insulating material installed in contact with the back surface of the road wall, and further has a non-foamed resin heat insulating material cover covering the back surface of the heat insulating material behind the heat insulating material. Insulation without the insulation facing the suction air duct One in which the bar is facing.

  Moreover, the indoor unit of the air conditioner according to the present invention has a first suction port on the upper surface, a blower port on the lower part on the front side, a blower fan inside, and a heat exchanger disposed on the upstream side of the blower fan. A vertical airflow direction plate that adjusts the vertical direction of the blowout air blown from the blowout port, a second suction port that opens at the bottom of the housing behind the blowout port, and a blower fan to the blowout port And the rear side of the blower air channel partitioned by the blower air channel wall and the interior of the housing behind the blower air channel wall, the indoor air sucked in from the second suction port is upstream of the heat exchanger. A suction air passage that leads to the side, an opening and closing plate that rotates to open and close the second suction port, and a control device that controls the operation of the indoor unit of the air conditioner. At the rear end, with the front end facing downward The second suction port is opened by rotating to the control device until the temperature Th of the heat exchanger becomes equal to or higher than a predetermined temperature Ta at the start of heating operation of the air conditioner. Or, until a predetermined time elapses from the start of the heating operation, the opening / closing plate is opened to open the second suction port, and the direction of the up / down air direction plate is adjusted, so that at least a part of the blowing air is second A short circuit that flows into the suction port is formed.

  According to this invention, during cooling operation, moisture in the room air can be prevented from condensing in the suction air passage that guides the room air from the second suction port on the bottom surface of the housing to the upstream side of the heat exchanger. An indoor unit of an air conditioner that can clean the inner wall surface of the road can be obtained.

  Moreover, according to this invention, the indoor unit of the air conditioner which can blow off warm air from a blower outlet in a short time from a user's heating operation start instruction | indication using the 2nd suction opening of a housing | casing bottom face. Can be provided.

It is a perspective view of the indoor unit in Embodiment 1 of this invention. It is a perspective view in the state where the opening / closing plate of the indoor unit of FIG. 1 was opened. It is a longitudinal cross-sectional view of the indoor unit of FIG. It is a longitudinal cross-sectional view of the indoor unit of FIG. It is a single-piece | unit perspective view of the opening-and-closing board in the indoor unit of FIG. It is a fragmentary perspective view of the opening-and-closing plate of the state attached to the indoor unit of FIG. It is a longitudinal cross-sectional view of the indoor unit in Embodiment 2 of this invention. It is a longitudinal cross-sectional view of the indoor unit in Embodiment 3 of this invention. It is a control flowchart at the time of the heating operation in the indoor unit of FIG.

Embodiment 1 FIG.
1 and 2 are perspective views of an indoor unit 100 of an air-conditioning apparatus according to Embodiment 1 of the present invention as seen obliquely from below, FIG. 1 is a state in which the operation is stopped, and FIG. 2 is a state during the cooling operation. Is shown. 3 and 4 are longitudinal sectional views of the indoor unit 100. FIG. 3 shows a state of operation stop corresponding to FIG. 1, and FIG. 4 shows a state during cooling operation corresponding to FIG. . This indoor unit 100 is connected to an outdoor unit (not shown) installed outdoors via a refrigerant pipe to form a refrigeration cycle circuit.

  The indoor unit 100 is a wall-hanging type installed on the upper wall surface of a room to be air-conditioned, and includes a rear case 11 and a front frame 12 as shown in FIGS. 10, a blower fan 1, and a V-shaped heat exchanger 2 are disposed in a downward direction so as to surround the blower fan 1 on the upstream side of the blower fan 1. . The heat exchanger 2 includes a front heat exchanger 2a located on the front side inside the housing 10 and a back side heat exchanger 2b located on the back side. The blower fan 1 is an elongated cylindrical cross flow fan, and is arranged horizontally such that its longitudinal direction is the left-right direction of the housing 10.

  A front design panel 13 that can be opened and closed by rotating in the vertical direction with the upper part as a fulcrum is attached to the front surface of the housing 10. Here, with respect to the indoor unit 100, the direction of the wall surface side of the room where the indoor unit 100 is installed is the rear side, the rear side, the back side, and the rear side, and the opposite direction is the front side, the front side, or the front side. The direction connecting the front side and the back side is referred to as the front-rear direction or the depth direction.

  The upper surface of the housing 10 is provided with a first suction port 3 formed in a lattice shape as an inlet for room air. A blowout port 4 extending in the left-right direction of the indoor unit 100 is formed in the lower part on the front side of the housing 10. The longitudinal direction of the outlet 4 and the housing 10 is the same direction. A control device 30 that controls the operation of the indoor unit 100 is installed inside the housing 10. The control device 30 has a control board, and a circuit including a microcomputer for controlling the operation of the indoor unit 100 is formed on the control board.

  The blowout port 4 is provided with a plate-like vertical wind direction plate 5 that adjusts the wind direction of the blowout air into the room in the vertical direction. As shown in FIGS. 1 and 3, the indoor unit 100 is stopped during operation. The vertical wind direction plate 5 is oriented so as to cover the outlet 4. As shown in FIGS. 3 and 4, the vertical wind direction plate 5 includes a front vertical wind direction plate 5 a and a rear vertical wind direction plate 5 b that are separated in the front-rear direction, and can be independently controlled by separate drive motors. Thus, the vertical direction of the blowing air is changed by rotating based on an instruction from the control device 30 and changing the angle in the vertical direction.

  A blower air passage 6 from the blower fan 1 to the blowout port 4 positioned below the blower fan 1 is formed downstream of the blower fan 1, and the blower air passage 6 has a curved surface on the back side. Are separated by a blowing air passage wall 7. The blowout air passage wall 7 is curved so as to be recessed with respect to the blowout air passage 6, and is fixed to the front side of the rear case 11.

  A left and right wind direction plate 8 that adjusts the wind direction of the blown air into the room in the left and right direction is installed on the back side of the up and down wind direction plate 5 in the blowout air passage 6. The left and right wind direction plate 8 is composed of a plurality of plate-like blades arranged in parallel in the left-right direction of the outlet 4, and these plate-like blades change the angle in the left-right direction based on instructions from the control device 30, thereby Change direction.

  An air filter 9 is installed on the upstream side of the heat exchanger 2 inside the housing 10 to capture dust in the indoor air sucked into the housing 10. The room air sucked from the first suction port 3 and the second suction port 14 described later passes through the air filter 9 and then flows into the heat exchanger 2.

  A second suction port 14 serving as an inlet for room air is formed on the bottom surface (lower surface) of the housing 10 on the rear side of the blowing port 4, that is, on the wall surface side. The second suction port 14 opens in a rectangular shape elongated in the left-right direction of the housing 10 on the bottom surface of the housing 10, and is formed on the bottom surface of the back case 11 in the indoor unit 100. A rectangular opening / closing plate 15 that opens and closes the second suction port 9 is attached to the second suction port 14 by rotating in the front-rear direction with an end in the front-rear direction as a fulcrum. In this indoor unit 100, a pivot point is provided at the rear end of the opening / closing plate 15, so that the opening / closing plate 15 draws an arc from the front side to the wall surface side downward from the closed state of the opening / closing plate 15. The second suction port 14 is opened by rotating the angle. The opening / closing plate 15 is opened and closed by a drive motor and controlled by the control device 30. The rotation angle is not limited to 80 degrees, but is preferably 90 degrees at the maximum.

  As shown in FIGS. 3 and 4, the indoor air sucked from the second suction port 9 is placed behind the blowing air passage wall 7, which is a partition wall on the back side of the blowing air passage 6, inside the housing 10. A suction air passage 16 that leads to the space S on the upstream side of the side heat exchanger 2b is formed. The room air sucked from the second suction port 14 and passed through the suction air passage 16 merges with the room air sucked from the first suction port 3 in this space S. At the upper end portion of the suction air passage 16, an inflow port 17 through which room air flowing through the suction air passage 16 flows into the space S is formed. The second suction port 9 and the inflow port 17 communicate with each other through the suction air passage 16. The air filter 9 covers the first suction port 3 on the downstream side, and also covers the inflow port 17 on the downstream side.

  The suction air passage 16 is a substantially rectangular space that is surrounded by partition walls on the front, rear, left and right sides, and has a second suction port 14 (where the opening / closing plate 15 is open) and an inflow port 17. The rear air passage wall 18 serving as a partition on the back side of the suction air passage 16 is carried by the back wall of the rear case 11, and the rear air passage wall 18 is a part of the rear case 11. The back case 11 including the rear air passage wall 18 is a resin molded product obtained by non-foaming injection molding of a resin material PS (polystyrene). The resin material is not limited to PS, but may be other general-purpose resin materials such as ABS (acrylonitrile butadiene styrene) and PP (polypropylene).

  During the cooling operation or the dehumidifying operation of the indoor unit 100, the control device 30 opens the opening / closing plate 15 and opens the second suction port 14, but the air filter 9 that captures dust in the sucked indoor air is provided at the inlet 17. Since it is on the downstream side, the indoor air flowing through the suction air passage 16 from the second suction port 14 to the inflow port 17 becomes air containing dust before passing through the air filter 9. For this reason, the dust contained in the indoor air flowing through the suction air passage 16 is likely to adhere to the inner wall surface of the suction air passage 16, and the attached dust and associated dirt are cleaned to clean the suction air passage 16. It is necessary to keep it clean.

  The partition on the front side of the suction air passage 16 is divided into a portion that is the rear side of the blowout air passage 6 and a portion that is above the blowout air passage 6. First, the part above the blowing air path 6 will be described. A front side air passage wall 19 is formed in this portion, and the front side air passage wall 19 separates the space S that is the upstream space of the back side heat exchanger 2b and the suction air passage 16. However, the inflow port 17 described above is open to the front air passage wall 19, and the space S communicates with the suction air passage 16 through the inflow port 17. The space S is mainly located in front of the front air passage wall 19 and the suction air passage 16 is located on the back side, both of which are spaces in which room air before passing through the heat exchanger 2 exists. There is almost no temperature difference between the front and rear spaces across the front air passage wall 19.

  In the indoor unit 100, the front air passage wall 19 is integrally formed with the blowout air passage wall 7 that is the back wall of the blowout air passage 6, and is fixed to the front side of the rear case 11 together with the blowout air passage wall 7. . The front air passage wall 19 may be formed separately from the blowing air passage 7 or may be integrally formed with the back case 11. In any case, both the blowout air passage wall 7 and the front air passage wall 19 are made of a resin molded product obtained by non-foaming injection molding of PS, ABS, or PP, similarly to the rear case 11 (including the rear air passage wall 18). To do.

  Next, a description will be given of a portion on the rear side of the blowing air passage 6 in the front partition of the suction air passage 16. In a conventional indoor unit such as the prior art document mentioned above, heat is sucked from a blow-off air passage where the air whose temperature is adjusted by the heat exchanger flows toward the blow-out port and the second suction port on the lower surface of the housing. The air passage through which room air flows toward the space upstream of the exchanger was adjacent to the front and rear with the blowout air passage wall interposed therebetween. That is, the front surface of the plate-like blowing air passage wall faces the blowing air passage, and the back surface faces the suction air passage.

  However, in the indoor unit 100 shown in the first embodiment, as shown in FIGS. 3 and 4, the heat insulating material 20 is installed behind the blowing air passage wall 7 in contact with the back surface of the blowing air passage wall 7. ing. The back surface of the blowing air passage 7 does not directly face the suction air passage 16. Here, the heat insulating material 20 is stuck and fixed to the back surface of the blowing air passage wall 7 with an adhesive. In addition, fixation of the heat insulating material 20 is not limited to sticking fixation with an adhesive agent. For example, a fixed frame made of folded pieces and protrusions protruding toward the back side may be integrally formed on the back surface of the blowout air passage wall 7 and the heat insulating material 20 may be fitted into the fixed frame and fixed. However, sticking and fixing with an adhesive has an advantage that the back surface of the blowout air passage wall 7 and the heat insulating material 20 can be reliably brought into contact with each other.

  In this indoor unit 100, a foamed resin is used as the heat insulating material 20 by taking advantage of its high heat insulating property and versatility. Among them, polystyrene (PS), which is particularly versatile, is foam injection molded. The expanded polystyrene (expanded polystyrene) is used. The heat insulating material 20 is not limited to expanded polystyrene, and may be other expanded resin such as expanded polyethylene or expanded polyurethane. Further, glass wool made of glass fiber that is not a foamed resin can be used.

  The heat insulating material 20 made of foamed resin is formed in a curved shape in accordance with the blowout air passage wall 7 that is curved so as to be recessed backward in order to make contact with the back surface of the blowout air passage wall 7. Thus, it is easier for the heat insulating material 20 to contact the heat insulating material 20 with the back surface of the air blowing path wall 7 by using a foamed resin that can be molded into a shape that matches the shape of the air blowing path 7. Among the foamed resins, the indoor unit 100 uses a polystyrene foam that is easy to foam and is particularly versatile.

  At the time of cooling operation or dehumidifying operation of the air conditioner provided with the indoor unit 100, the opening / closing plate 15 is opened by the control device 30, and the rotation of the blower fan 1 causes only the first suction port 3 on the top surface of the housing 10 to rotate. In addition, room air is also sucked from the second suction port 14 on the bottom surface of the housing 10, and the sucked room air exchanges heat with the refrigerant flowing in the heat exchanger 2 when passing through the heat exchanger 2. As a result, the conditioned air is cooled and cooled through the blowout air passage 6 and blown out from the blowout port 4.

  The blowout air passage wall 7 guides the cooled conditioned air flowing through the blowout air passage 6 to the blowout port 4 and is cooled by the conditioned air. For this reason, the surface temperature of the blowout air passage wall 7 becomes lower than the temperature of the indoor air before cooling that is sucked in from the second suction port 14 and flows through the suction air passage 16. Not only the surface of the blowout air passage wall 7 facing the blowout air passage 6 but also the surface temperature of the back surface of the blowout air passage wall 7 is similarly lower than the temperature of the room air flowing through the suction air passage 16 due to heat conduction.

  In the case of a conventional air conditioner indoor unit as shown in Patent Document 1 presented as a prior art document, the back surface of the blowout air channel wall 7 cooled by the blown air cooled during the cooling operation is sucked. Since it faces the air passage 16 directly, a part of the room air flowing through the suction air passage 16 is cooled by the back surface of the cold blowing air passage wall 7. For this reason, water vapor contained in the indoor air is condensed on the back surface of the blowout air passage wall 7 and adhered as water droplets, so-called dew condensation has occurred.

  However, in this indoor unit 100, the heat insulating material 20 is installed between the blowing air passage wall 7 and the suction air passage 16 positioned at the front and back so as to be in contact with the back surface of the blowing air passage wall 7. The heat insulating material 20 blocks the flow of heat between the indoor air flowing through the suction air passage 16 and the blowout air passage wall 7 cooled by the blowout air in the cooling operation, and thus flows through the suction air passage 16. The room air is not cooled by the blowout air passage wall 7. Therefore, the moisture in the indoor air flowing through the suction air passage 16 is not condensed, and the occurrence of condensation in the suction air passage 16 can be avoided. Therefore, in the above-described conventional indoor unit, the dew condensation water collecting mechanism that is necessary to prevent the condensed water adhering to the back surface of the blowout air passage wall from dripping from the second blowout port is provided as the indoor unit 100. Then it can be omitted.

  Furthermore, in this indoor unit 100, a heat insulating material cover 21 is installed behind the heat insulating material 20 (on the back side). The heat insulating material cover 21 is a resin molded product obtained by non-foaming injection molding of PS, ABS, or PP, similarly to the blowout air passage wall 7 and the back case 11, and covers at least the back surface of the heat insulating material 20. Therefore, the back surface of the heat insulating material 20 does not face the suction air passage 16, and the back surface of the heat insulating material cover 21 faces the suction air passage 16. In other words, the wall surface that partitions the front side of the suction air passage 16 located behind the blowout air passage 6 is the heat insulating material cover 21.

  The heat insulating material cover 21 is attached and fixed to the blowout air passage wall 7. A claw portion (not shown) formed in the heat insulating material cover 21 is hooked and fixed to a hole or a step portion or an end portion formed in the blowing air passage wall 7. Here, since the heat insulating material 20 is adhered and fixed to the back surface of the blowout air passage wall 7 with an adhesive, a gap exists in the front-rear direction between the heat insulating material 20 and the heat insulating cover 21.

  In addition, about fixation of the heat insulating material 20, you may make it hold | maintain on both sides of the heat insulating material 20 with the blowing wind path wall 7 and the heat insulating material cover 21, without using an adhesive agent. Using the elastic force of the heat insulating material 20, the heat insulating material cover 21 holds the heat insulating material 20 so as to be slightly compressed in the front-rear direction and pressed against the blowing air passage 7. Contact is ensured. Thus, when fixing the heat insulating material 20, the heat insulating cover 21 contacts the back surface of the heat insulating material 20. FIG. The effect of the heat insulating material cover 21 will be described later.

  As described above, in this indoor unit 100, since the heat insulating material 20 is installed in contact with the back surface of the blowout air passage wall 7, the suction air passage 16 located behind the blowout air passage 6 is provided during the cooling operation. Moisture in the flowing indoor air is condensed and water droplets are not attached to the inner wall surface of the suction air passage 16, and a mechanism for collecting the dew condensation water can be dispensed with. It is possible to prevent generation of mold caused by condensed water on the inner wall surface.

  Here, as an assembling procedure, the heat insulating material 20 is fixed to the back surface of the blowout air passage wall 7 (including the front air passage wall 19), which is a curved plate-like component, by bonding or fitting, and further, the back surface side of the heat insulating material 20 After fixing the heat insulating cover 21, the blowing air passage wall 7 is attached and fixed to the front side of the rear case 11. Even when the heat insulating material 20 is sandwiched and fixed between the blowing air passage wall 7 and the heat insulating material cover 21, similarly, after the heat insulating material 20 is first sandwiched, the blowing air passage wall 7 is placed on the front side of the rear case 11. Install. The blowing air passage wall 7 may be fixed by attaching the heat insulating material cover 21 to the rear case 11 instead of the blowing air passage wall 7.

  When the blowing air passage wall 7 and the front air passage wall 19 are provided separately, the front air passage wall 19 is also attached to the front upper portion of the rear case 11 when the blowing air passage wall 7 is attached. The front air passage wall 19 may be fixed to the blowing air passage wall 7 by being attached thereto. Each mounting structure is based on claw engagement, but screw fixation may be used, or claw fixation and screw fixation may be used in combination. As shown in FIGS. 3 and 4, a refrigerant pipe 22 connected to the heat exchanger 2 is arranged at the lower back of the back case 11.

  In the indoor unit 100, an opening / closing plate 15 that opens and closes the second suction port 14 is attached to the rear case 11. FIG. 5 is a single perspective view of the opening / closing plate 15, and shows the state when the second suction port 14 is closed in the indoor unit 100 as viewed obliquely from above. As shown in FIG. 5, the opening / closing plate 15 has support pieces 15d projecting from the back side (near the rear end) of the left and right ends of the rectangular flat plate 15a.

  A cylindrical shaft 15b is formed at the front end of the left support piece 15d so as to protrude from the outer surface (left side surface) to the left side (outward) from the left end of the flat plate 15a in parallel with the longitudinal direction of the flat plate 15a. A hollow cylindrical boss 15c coaxially with the shaft 15b protrudes to the right side of the right end of the flat plate 15a (outward) from the outer surface (right side surface) at the tip of the right support piece 15d. Is formed. The flat plate 15 a, the shaft 15 b, the boss 15 c, and the two support pieces 15 d are integrally molded, and are non-foam molded resin molded products similar to the back case 11.

  A separate stopper 23 is fixed to the rear end of the flat plate 15a at the center in the longitudinal direction (left-right direction). The stopper 23 is slidable in the longitudinal direction of the flat plate 15a, has a slide shaft 23a protruding to the left side of the stopper 23, and the slide shaft 23a can be translated in the left-right direction in conjunction with the left-right movement of the knob portion 23b. It has become.

  Although not shown in the drawing, bearings are formed near the rear surfaces of the left and right edges of the second suction port 14 of the rear case 11, and the centers of both bearings are coaxial. In a state where the opening / closing plate 15 is attached to the indoor unit 100, the shaft 15b is rotatably fitted to the left bearing, and the boss 15c is rotatably fitted to the right bearing. The motor shaft of the drive motor is fixed to the inner periphery of the boss 15c, and the motor shaft and the boss 15c rotate synchronously. The drive motor is fixed to the upper side of the bottom surface of the back case 11. Note that the right-side bearing may fit the motor shaft. Also, the left and right configurations may be reversed.

  FIG. 6 is a partial perspective view of the state in which the opening / closing plate 15 is attached to the indoor unit 100 and the second suction port 14 is opened from an obliquely lower side. As shown in the drawing, a bearing arm 24 is formed at the center of the rear edge of the second suction port 14 of the back case 11, and a hollow cylindrical bearing portion is formed at the tip of the arm. The slide shaft 23a of the stopper 23 is rotatably fitted to the bearing portion, and the shaft 15b, the boss 15c, and the slide shaft 23a are synchronously rotated coaxially by the rotation of the drive motor, and the flat plate 15a rotates around the bearing as a fulcrum. Move.

  In this way, the opening / closing plate 15 places a pivot point on the back side (rear end) of the flat plate 15a, and draws an arc with the front end of the flat plate 15a facing downward from the front side (front) to the back side (rear). Thus, the second suction port 14 is opened. Conversely, the second suction port 14 opened by rotating upward from the back side (rear) to the front side (front). Is closed. In other words, the opening / closing plate 15 has a front opening structure that has a pivot point at the rear end and rotates in the front-rear direction to open and close the second suction port 14.

  The flat plate 15a that is elongated in the left-right direction is not only pivotally supported at both left and right ends, but is also pivotally supported by the bearing arm 24 at the center in the left-right direction. Deformation that is curved can be prevented. The control device 30 controls the drive motor that rotates the opening / closing plate 15. During the cooling operation or the dehumidifying operation, the second suction port 14 is opened, and when an operation stop instruction reaches the indoor unit 100 from the remote controller, the drive motor rotates and the opening / closing plate 15 is closed.

  In the indoor unit 100, the opening / closing plate 15 can be easily attached and detached by the user, and the attaching and detaching method will be described here. While the air conditioner is stopped, the user opens the opening / closing plate 15 by hand. In a state where the opening / closing plate 15 is closed, a gap of 1 to 3 mm width is provided at least at three positions (three sides) of the front end and the left and right ends of the flat plate 15a and the front edge and the left and right edges of the second suction port 14. ing. If the flat plate 15a is pushed down by inserting or hooking a fingertip into the gap, the opening / closing plate 15a can be easily rotated to overcome the torque of the drive motor and can be opened.

  As described above, when the opening / closing plate 15 is manually rotated to the maximum opening angle of 80 degrees to be in the open state, the opening / closing plate 15 is rotated downward from the front side to the back side before being changed from the closed state to the open state. Because of the open configuration, the stopper 23 attached to the central back side of the opening / closing plate 15 is exposed facing the front. The user pinches the knob 23b of the stopper 23 or presses the finger and slides it to the right here. The slide shaft 23a moves to the right side in conjunction with the slide of the knob portion 23b, disengages from the bearing of the fixed bearing arm 24, and the fitting of the slide shaft 23 and the bearing arm 24 is released.

  In a state in which the fitting between the slide shaft 23 and the bearing arm 24 is released, the elongated flat plate 15a is supported only at the left and right ends, so that it can be easily bent using the elasticity of the flat plate 15a. Therefore, either the shaft 15b or the boss 15c can be removed from the bearing by pushing the center part in the left-right direction backward, that is, indented toward the wall side, and elastically deforming (bending deformation) in a curved shape. The opening / closing plate 15 can be removed from the rear case 11 by removing the other side from the bearing.

  By removing, the opening / closing plate 15 can be washed with water in another place such as a washroom or a bathroom, and adhering dust and dirt can be removed, and the cleanliness of the opening / closing plate 15 can be maintained. The flat plate 15a may be flexibly deformed and removed from the bearing in which both the shaft 15b and the boss 15c are fitted almost simultaneously. In addition, when opening the opening-and-closing plate 15 manually, it is not necessary to open to the maximum opening angle, and as long as the knob part 23b of the stopper 23 can be slid, the opening may be smaller than the maximum opening angle. . Here, the opening angle is an angle by which the flat plate 15a rotates downward with the closed state being 0 degree.

  When the removed opening / closing plate 15 is attached to the rear case 11, the above-described removal operation may be reversed. First, either the shaft 15b or the boss 15c is fitted to the corresponding bearing, the flat plate 15a is bent and deformed in an arcuate shape, and the other is fitted to the bearing. The flat plate 15a may be bent so that the shaft 15b and the boss 15c are fitted to the bearing almost simultaneously. Then, with the opening / closing plate 15 in the open state, the stopper 23 is directed to the front side, the knob portion 23b is slid to the left, and the interlocking slide shaft 23a is fitted to the bearing arm 24 to complete the mounting. .

  Thus, the opening / closing plate 15 can be attached to and detached from the back case 11 with a simple operation by the user. For this reason, the frequency of washing the open / close plate 15 with water increases, and the cleanliness of the open / close plate 15 is maintained. Since the opening / closing plate 15 is configured to open forward downward, the stopper 23 is exposed facing the front. Therefore, a user who manually opens the opening / closing plate 15 facing the wall surface on which the indoor unit 100 is installed can slide the knob portion 23a while looking at the stopper 23 in front without changing the direction of the body. it can. In addition, the user can also perform the work of removing the shaft 15b and the boss 15c from the bearing while looking at the operation objects in front. Thereby, the removal work is easy, the work can be performed reliably, and the user can work with a sense of security. The same effect can be obtained during installation work.

  The opening / closing plate 15 may have a rear opening configuration in which a pivot is provided on the front side and the rear end rotates from the rear to the front so as to draw an arc downward. However, if the opening / closing plate 15 is to be attached / detached with such a rear opening structure, the operation objects such as the stopper 23, the shaft 15b, and the boss 15c are located behind the flat plate 15a, and it is difficult to work while looking at them. It becomes. If you want to work while looking at these operating objects, you will have to change the direction of your body facing the wall or twist your neck back, which will make your working posture worse and your workability will be reduced. For this reason, if the opening / closing plate 15 is configured to be removable, the front opening configuration of the opening / closing plate 15 is extremely advantageous in terms of workability.

  By removing the opening / closing plate 15, the second suction port 14 opens entirely. This facilitates cleaning of the inner wall surface of the suction air passage 16. A user can insert a commercially available handy mop that removes dust with fine synthetic fibers from the second suction port 14 to remove dust attached to the inner wall surface of the suction air passage 16. Depending on the depth width (the width in the front-rear direction) of the second suction port 14, the user directly inserts a hand with a rag into the second suction port 14 and cleans the inner wall surface of the suction air passage 16 with the rag. be able to.

  Here, the inner wall surface of the suction air passage 16 is the wall surface of the rear air passage wall 18 on the back side, which is a part of the back case 11 that is a non-foamed molded product of resin as described above. Similarly, on the front side, the upper part is the wall surface of the front air passage wall 19, which is a resin non-foamed molded product integrally formed with the blowout air passage wall 7. The lower part on the front side is the wall surface of a separate heat insulating material cover 21, which is also a resin non-foamed molded product as described above. Of the inner wall surface of the suction air passage 16, the partition walls constituting the left and right wall surfaces are each integrally formed in the back case 11 here. However, these may be integrally formed in the blowing air passage 7. In any case, the left and right wall surfaces are also non-foamed molded articles of resin.

  As described above, the inner wall surface of the suction air passage 16 is formed of a resin molded product by non-foaming injection molding in all four directions, front, rear, left and right. As a result, the inner wall surface facing the suction air passage 16 is a smooth surface with no irregularities on all four sides. For this reason, the user can easily remove the attached dust and dirt with a handy mop or a dust cloth, and the inside of the suction air passage 16 can be cleaned. Here, the absence of unevenness is macroscopic and does not include minute unevenness on the order of microns.

  Thus, in order to configure all four sides of the inner wall surface of the suction air passage 16 with the smooth surface of the resin non-foamed molded product, the indoor unit 100 uses a resin non-foamed molded product behind the heat insulating material 20. A certain heat insulating material cover 21 is installed, and the back surface of this heat insulating material cover 21 faces the suction air passage 16. If this heat insulating material cover 21 is not installed, the heat insulating material 20 made of polystyrene foam faces the front lower portion of the suction air passage 16.

  A foamed resin molded product (foamed resin) such as expanded polystyrene has a rough surface with irregularities due to its structure. In such a surface, dust and dirt adhering to the dent may not be removed with a handy mop or a rag, and when cleaned by the same cleaning method, a non-foam molded resin molded product such as the heat insulating material cover 21 is used. Compared with the smooth surface, the dust and dirt remain, and the inside of the suction air passage 16 cannot be cleaned.

  In particular, the polystyrene foam used here as the heat insulating material 20 has a property of being easily charged with static electricity. Therefore, when cleaning with a handy mop or a dry rag, static electricity is generated due to friction with them, and a vicious circle may occur in which dust in the indoor air is attracted and easily attached.

  Even if the heat insulating material 20 is a foamed resin other than the foamed polystyrene, the surface is a rough surface with unevenness like the foamed polystyrene, and if the heat insulating material 20 is directly exposed to the suction air passage 16, a handy mop or By simple cleaning only by wiping with a dust cloth or the like, the inner wall surface of the suction air passage 16 cannot be cleaned. Further, when glass wool made of glass fiber is used as the heat insulating material 20, the surface thereof is cotton-like, and if dust or dirt adheres thereto, it becomes more difficult to remove than the foamed resin.

  In this indoor unit 100, the heat insulating material cover 21 that is a non-foam molded resin molded product formed of a smooth surface covers the back surface of the heat insulating material 20, and the heat insulating material 20 is not exposed to the suction air passage 16. Since the heat insulating material cover 21 faces the suction air passage 16 and the inner wall surface of the suction air passage 16 is made of a smooth non-foamed resin molded product, the user can use a handy mop or a dry dust cloth. The dust and dirt adhering to the inner wall surface of the suction air passage 16 including the heat insulating material cover 21 can be easily removed, and the inside of the suction air passage 16 can be kept clean.

  Moreover, since the heat insulating material 20 is not exposed to the suction air passage 16 by installing the heat insulating material cover 21 as described above, a heat insulating member that is difficult to remove dust and dirt attached to the surface is used as the heat insulating material. 20 can be installed on the back surface of the blowing air passage wall 7.

  And by installing the heat insulating material 20 so as to be in contact with the back surface of the blowing air passage wall 7, it is cooled by the blowing air (cold air) flowing through the blowing air passage 6 after passing through the heat exchanger 2 during the cooling operation or the dehumidifying operation. The heat transfer between the blowout air passage wall 7 and the indoor air flowing through the suction air passage 16 is blocked by the heat insulating material 20, so that the indoor air flowing through the suction air passage 16 is cooled by the blowout air passage wall 7. The occurrence of condensation on the inner wall surface of the suction air passage 16 can be avoided. For this reason, generation | occurrence | production of the mold | fungi resulting from condensed water can be prevented on the inner wall face of the suction air path 16, and the cleanliness level in the suction air path 16 can be raised more. Moreover, the collection mechanism of the dew condensation water in the suction air path 16 can be made unnecessary.

  Further, since the user can detach the opening / closing plate 15 that opens and closes the second suction port 14, the opening / closing plate 15 can be washed with water in another place, and the opening / closing plate 15 can also be kept clean. Then, by removing the opening / closing plate 15, there is no protrusion around the second suction port 14, so the user inserts a handy mop or a dust cloth from the second suction port 14 to clean the inner wall surface of the suction air passage 16. In this case, the cleaning operation is easy and the ability to remove adhering dust and dirt is enhanced.

  Further, the opening / closing plate 15 has a pivoting fulcrum at the rear end (rear side) and has a front opening configuration in which the front end opens in an arc so that the user can open the opening / closing plate 15 when the user attaches / detaches the opening / closing plate 15. Since it is possible to work on the open / close plate 15 while directly observing the operation target without twisting the body or neck, the attaching / detaching operation of the open / close plate 15 can be performed easily and reliably.

  Ideally, the heat insulating material 20 is installed in all regions (target regions) where the blowing air passage 6 and the suction air passage 16 overlap in the front-rear direction. However, it may be difficult to install in the entire target area due to physical constraints on the structure. Even in such a case, it is desirable to install the target region in as wide a range as possible by using a plurality of heat insulating materials 20 having different shapes and thicknesses. In addition, it is desirable to cover the entire back surface of the heat insulating material 20 with the heat insulating material cover 21. For this purpose, a plurality of heat insulating material covers 21 may be used.

  The indoor unit 100 according to the first embodiment opens the opening / closing plate 15 not only from the first suction port 3 on the upper surface but also during the heating operation as well as the cooling operation and the dehumidifying operation. Indoor air may be sucked from the suction port 14.

Embodiment 2. FIG.
FIG. 7 is a longitudinal sectional view of an indoor unit 200 for an air conditioner according to Embodiment 2 of the present invention. In FIG. 7, the same reference numerals as those in FIGS. 3 and 4 denote the same or corresponding parts as the indoor unit 100 described in the first embodiment, and the description thereof is omitted here. The indoor unit 200 shown in FIG. 7 is different from the indoor unit 100 shown in FIG. 4 in a heat insulating structure that suppresses heat in and out between the blowout air passage wall 7 and the indoor air flowing through the suction air passage 16.

  As shown in FIG. 7, in this indoor unit 200, unlike the indoor unit 100 in the first embodiment, the heat insulating material 20 is not installed on the back surface of the blowing air channel wall 7, and the air is blown out behind the blowing air channel wall 7. A space 25 in which air exists is formed between the air passage wall 7 and the suction air passage 16. The space 25 is sealed so that the air inside does not circulate outside the space 25. Although air for sealing is present in the space 25, the air is sealed and the space 25 has no air in and out.

  A method of forming the sealed space 25 will be described later. By forming the closed space 25 in which air exists in this manner, the convection between the blowing air passage wall 7 and the suction air passage 16 is formed. Since there is almost no air layer, this air layer exhibits a heat insulating effect, and the air flow path wall 7 cooled by the air flow (cool air) flowing through the air flow path 6 during the cooling operation or the dehumidifying operation, The heat input and output between the room air flowing through the suction air passage 16 is blocked. For this reason, the indoor air flowing through the suction air passage 16 is not cooled by the blowout air passage wall 7, and the occurrence of condensation on the inner wall surface of the suction air passage 16 can be avoided.

  In order to provide an air layer that exhibits a heat insulating effect between the blowout air passage wall 7 and the suction air passage 16, a sealed space 25 in which air is enclosed is required between them. A method for forming the space 25 will be described. The sealed space 25 is formed by arranging a heat insulating cover 26 made of resin on the back side of the blowing air passage wall 7 and vibrating and welding the heat insulating cover 26 to the back surface of the blowing air passage 7. The heat insulating cover 26 includes a cover plate 26a that is a plate-like member facing the suction air passage 16, and a joining rib 26b that protrudes from the cover plate 26a toward the blowout air passage wall 7, and these are integrally molded to form a box It has a shape.

  The heat insulating cover 26 is a non-foamed resin molded product obtained by injection molding PS, ABS, or PP, as with the back case 11. The back surface of the cover plate 26 a of the heat insulating material cover 26, that is, the surface opposite to the surface from which the joining rib 26 b protrudes faces the suction air passage 16, and this heat insulation cover 26 becomes a partition wall on the lower front side of the suction air passage 16. . The joining rib 26b is plate-shaped and protrudes along the outer periphery of the cover plate 26a or from a position close to the outer periphery in the front-rear direction of the housing 10, and is continuous so as to be closed in the upper, lower, left, and right directions. The protruding tips of the plate-like joining ribs 26 b serve as joining surfaces with the blowing air passage wall 7.

  The front end surface of the joint rib 26b closed in four directions of the heat insulating cover 26 is brought into contact with the back surface of the blowout air passage wall 7 in a single component state before being attached to the back cover 11, and pressure is applied to the cover plate 26a to insulate it. The cover 26 is pressed against the blowout air passage wall 7, and in this state, a lateral vibration in a direction perpendicular to the pressure acting direction is given to the heat insulating cover 26. As a result, the back surface of the blowing air passage wall 7 and the front end surface of the joining rib 26b are welded by frictional heat. All the tips of the joining ribs 26 b are joined to the back surface of the blowout air passage wall 7.

  In such vibration welding, the tip of the plate-like joining rib 26b that is closed in all directions along the outer periphery of the heat insulating cover 26 is joined to the back surface of the blowing air passage wall 7 over the entire circumference. 7, a space 25 is formed in which the front and rear direction is sandwiched between the blowout air passage wall 7 and the cover plate 26 a of the heat insulating cover 26, and the four sides of the upper, lower, left and right sides are surrounded by the joining ribs 26 b of the heat insulating cover 26. . And since all the front-end | tips of the joining rib 26b are joined to the back surface of the blowing wind path wall 7, the space 25 formed becomes a sealed state. Therefore, the air at the time of welding is sealed in the space 25. Since the space 25 is hermetically sealed, air does not enter or leave the space 25.

  The method of joining the heat insulating cover 26 to the blowout air passage wall 7 is not limited to vibration welding, but may be other welding methods such as ultrasonic welding. In addition, although the joint rib 26b serving as the peripheral wall of the space 25 is formed on the heat insulating cover 26, the plate-like joint rib 26b is protruded from the back surface of the blowout air passage wall 7, and the cover plate 26a is joined to the front end surface. May be. Alternatively, pressure may be applied to the front surface of the blowing air passage wall 7 to press the blowing air passage wall 7 against the heat insulating cover 26, and the blowing air passage wall 7 may be vibrated and welded.

  Further, as shown in FIG. 7, when the blowout air passage wall 7 or the cover plate 26a is curved, it may be difficult to weld the tip of the joining rib 26b to the mating surface. From the back surface of the road wall 7 toward the cover plate 26a and from the cover plate 26a toward the blowout air flow wall 7, the joint ribs 26b protrude from both sides, and the tips of the ribs are joined (welded) to each other. By doing so, the workability of the welding work is improved, and the risk of occurrence of poor bonding can be suppressed.

  The blowing air passage wall 7 is located behind the blowing air passage wall 7 at a predetermined distance from the blowing air passage wall 7, and becomes a partition wall at the lower front side of the suction air passage 16. It is surrounded by a cover plate 26a that is a plate-like member that faces and a plate-like joining rib (rib) 26b that extends in the front-rear direction and connects them, and the joining rib 26b serves as a peripheral wall, and the blowing air passage wall 7 A space 25 is formed between the suction air passage 16 and the suction air passage 16.

  Even if the joining rib 26b which becomes the peripheral wall of the space 25 protrudes from the cover plate 26a and its tip is joined to the back surface of the blowing air passage wall 7, it protrudes from the blowing air passage wall 7 and its tip is joined to the cover plate 26a. May be. Alternatively, the joining ribs 26b may be protruded from both the blowing wind wall 7 and the cover plate 26a, and the tips of the joining ribs 26b may be joined together.

  Further, in order to increase the bonding strength, in addition to the bonding ribs 26b serving as the peripheral walls of the space 25, another rib is provided on the inner side of the bonding ribs 26b closed in four directions. It may be welded. Another rib may be connected to the joining rib 26b, or may be formed independently without being connected to the joining rib 26b.

  In this way, the heat insulating cover 26 is welded to the back surface, and the blowout air passage wall 7 that forms the sealed space 25 where air exists is attached and fixed to the front side of the back cover 11 by claw fixing, bolt fixing, or a combination thereof. By doing so, the space 25 is located between the blowing air passage wall 7 and the suction air passage 16 that are arranged in parallel in the front-rear direction, and an air layer due to the air in the space 25 exists.

  Since the space 25 is sealed and air does not enter and exit from the outside of the space 25, almost no convection of air existing in the space 25 occurs. For this reason, the air layer in the space 25 exhibits a heat insulating effect, and the airflow path wall 7 cooled by the cold airflow flowing through the airflow path 6 and the room flowing through the suction airway 16 during the cooling operation or the dehumidifying operation. The heat in and out of the air is blocked. Therefore, the room air flowing through the suction air passage 16 is not cooled by the blowout air passage wall 7, and the occurrence of condensation on the inner wall surface of the suction air passage 16 can be avoided. Therefore, generation of mold caused by condensed water can be prevented on the inner wall surface of the suction air passage 16, the level of cleanliness in the suction air passage 16 can be increased, and a mechanism for collecting the condensed water in the suction air passage 16 is not required. can do.

  Since the heat insulating cover 26 is non-foaming injection molded, the surface thereof is a smooth surface without unevenness, like the heat insulating material cover 21 of the indoor unit 100 in the first embodiment, and the heat insulating cover 26 which is such a surface. Since the rear side of the air-conditioner faces the suction air passage 16, as with the indoor unit 100 of the first embodiment, dust and dirt attached can be easily removed with a handy mop or a rag inserted by the user through the second suction port 14. It can be removed, and the inside of the suction air passage 16 can be kept clean.

  This indoor unit 200 flows through the blowout air channel wall 7 and the suction air channel 16 by using the heat insulating effect of the air in the sealed space 25 instead of the heat insulating material 20 in the indoor unit 100 of the first embodiment. It is intended to block the movement of heat between indoor air. The indoor unit 200 includes a blowing air passage 6, a blowing air passage wall 7, a space 25 serving as an air layer, a cover plate 26a of a heat insulating cover 26, a suction air passage 16, and a rear air passage from the front side toward the rear side. The walls 18 (back cover 11) are arranged in this order.

  Ideally, the sealed space 25 having an air layer exhibiting a heat insulating effect is installed in all regions (target regions) where the blowing air passage 6 and the suction air passage 16 overlap in the front-rear direction. However, it may be difficult to install in the entire target area due to physical constraints on the structure. Even in such a case, it is desirable to install the space 25 as wide as possible by forming a plurality of spaces 25 using a plurality of heat insulating covers 26.

  The indoor unit 200 according to the second embodiment also opens the opening / closing plate 15 to open the second suction port 14 not only from the first suction port 3 on the upper surface, but also during the heating operation as well as the cooling operation and the dehumidifying operation. You may make it inhale indoor air from.

  In both the indoor unit 100 of the first embodiment and the indoor unit 200 of the second embodiment, at least the surface facing the suction air passage 16 of the resin component constituting the suction air passage 16 is coated with an antifouling agent or an antistatic agent. As a result, it is possible to make it difficult for dust in the room air flowing through the suction air passage 16 to adhere to the inner wall surface of the suction air passage 16, and the effect of reducing the frequency of user cleaning is obtained. Even if these coatings are applied to the detachable opening / closing plate 15, the same effect can be obtained.

  Here, the antistatic agent makes the resin parts constituting the suction air passage 16 less likely to be charged with static electricity or prevents accumulation of static electricity, and dust is sucked by electrostatic action and adheres to the inner wall surface of the suction air passage 16. It is intended to prevent it.

  The peripheral wall of the suction air passage 16 is constituted by a rear cover 11 having a rear air passage wall 18 and a side wall, a front air passage wall 19, a heat insulating material cover 21, or a heat insulating cover 26. The above-described coating may be applied only to the surface facing the path 16, that is, the inner wall surface of the suction air path 16, but each of these components is immersed in a coating solution to coat the entire surface of the part. You may do it.

Embodiment 3 FIG.
In the third embodiment, operation control during heating operation using the second suction port 14 and the opening / closing plate 15 will be described. The configuration of the air conditioner that performs the operation control may be either the indoor unit 100 according to the first embodiment or the indoor unit 200 according to the second embodiment. A description will be given using the indoor unit 100 of the first embodiment. As shown in FIG. 8, the indoor unit 100 further includes a heat transfer tube temperature sensor 31 that measures the temperature Th of the heat exchanger 2.

  The heat exchanger 2 is of a fin-and-tube type, and a metal heat transfer tube (here, a copper tube) through which a refrigerant flows is finned to a plurality of metal (here, aluminum) thin plates arranged in parallel in the left-right direction. A plurality of rows and a plurality of rows are inserted in the parallel direction. A heat transfer tube temperature sensor 31 is in thermal contact with the outer surface of the heat transfer tube via a metal holder to measure the surface temperature of the heat transfer tube. The temperature measured by the heat transfer tube temperature sensor 31 is the temperature Th of the heat exchanger 2 (hereinafter referred to as heat exchanger temperature Th). Information on the heat exchanger temperature Th is input to the control device 30 via a lead wire. At the time of heating operation, the heat exchanger 2 acts as a condenser and gives the heat of condensation of the refrigerant to the indoor air passing therethrough, that is, heats the indoor air passing therethrough so that hot air blows out from the outlet 4. Become.

  The operation at the start of the heating operation of the indoor unit 100 here, that is, the control content by the control device 30 will be described based on the flowchart shown in FIG. When the user instructs the start of the heating operation with the remote controller, the heating operation is started (step S1). First, the compressor of the refrigeration cycle installed in the outdoor unit is driven (step S2), and the refrigerant is circulated in the refrigeration cycle. Further, the control device 30 sets the direction of the up / down airflow direction plate 5 to the short circuit mode as shown in FIG. 8 (step S3), opens the opening / closing plate 15 and opens the second suction port 14 (step S4). And the ventilation fan 1 is rotated (step S5). Thereby, a short circuit of blowing air using a second suction port 14 described later is formed (step S6).

  Here, as shown in FIG. 8, the short circuit mode of the up-and-down wind direction plate 5 in step S3 is such that the front up-and-down wind direction plate 5a is a so-called horizontal blowing direction in which the blowing air blows in the front direction, The wind direction plate 5b is set in a direction in which the blown air blows out in the direction inclined toward the wall surface on which the indoor unit 100 is installed, that is, rearward from the downward in the vertical direction (the direction of gravity). The front side up / down wind direction plate 5a is substantially sideways, and the rear side up / down wind direction plate 5b is inclined in an acute angle range closer to the wall surface than downward. Here, the angle at which the rear vertical wind direction plate 5b is inclined closer to the wall surface than downward (substantially in the direction of gravity) is 30 degrees counterclockwise with the direction of gravity as the reference line.

  In addition, although it is a short circuit mode of this up-and-down wind direction board 5, both the front side up-and-down wind direction board 5a and the back side up-and-down wind direction board 5b are directed to the wall surface side where the said indoor unit 100 is installed rather than the gravity direction. It may be in a direction that blows out in an inclined direction.

  The opening angle when the opening / closing plate 15 is opened in step S4 is 90 degrees or less from the closed state. Here, since the maximum opening angle (rotation angle) is set to 80 degrees downward, the maximum opening angle is set to 80 degrees, which is the maximum angle.

  The rotation speed of the blower fan 1 can be switched to three stages during the normal operation of the indoor unit 100, and the control device 30 controls the rotation speed. The rotational speed mode with the highest rotational speed and the maximum blown air volume is strong wind, the mode with the lowest rotational speed is the weak wind, and the mode with the rotational speed almost halfway between the strong wind and the weak wind is the medium wind. The rotational speed of the blower fan 1 in step 5 is selected from the low wind mode among the above three modes, and is 600 rpm here.

  In the formation of the short circuit in step 6, since the rotational speed of the blower fan 1 is in the weak wind mode and the wind speed of the blown wind is weak, the direction of the wall surface below the indoor unit 100 is indicated by the dotted arrow in FIG. A part of the blown air blown closer to the wall surface than the direction of gravitational force is adjusted from the second suction port 14 by the suction action by the rotation of the blower fan 1 as the wind direction is adjusted by the rear upper and lower wind direction plate 5b inclined to Inhalation occurs. In other words, a so-called short circuit is generated in which the blowing air blown from the blowing port 4 is immediately sucked from the second suction port 14 without circulating in the room.

  Note that the rotational speed of the blower fan 1 in step 5 is set to a rotational speed that is lower than the rotational speed of the weak wind mode that is not used during normal operation, for example, 450 rpm, so that a short circuit is formed. You may make it weaken the wind speed of the blowing wind at the time. In the case where the wind speed of the blown air is weak, the second suction port 14 can also be set by setting the short circuit mode of the up-and-down wind direction plate 5 in step S3 to the downward blowing direction during normal operation in which the blown air is in the direction of gravity. A short circuit of blowing wind using

  After passing through the heat exchanger 2 by forming a short circuit in which at least a part of the blowing air blown from the blowing port 4 flows into the second suction port 14 and is sucked from the second suction port 14 in this way. The air passes through the suction air passage 16 and again passes through the heat exchanger 2 and is reheated by the heat exchanger 2. For this reason, compared with the case where there is no short circuit, the time required to raise the temperature of the blowing air to a desired temperature can be shortened. This is due to the fact that the temperature rise of the heat exchanger temperature Th is faster than when no short circuit is formed by passing the warmed blown air again through the heat exchanger 2 due to the formation of the short circuit. doing.

  Further, in the state where the short circuit is formed, the opening / closing plate 15 has a front opening configuration in which the front end of the flat plate 15a is rotated downward from the front side to the back side to change from the closed state to the open state. The flat plate 15 a of the plate 15 hangs down from the vicinity of the back edge of the second suction port 14. Therefore, the flat plate 15a of the open / close plate 15 in the open state blocks the flow in the wall surface direction with respect to a part of the blown air whose air direction is adjusted by the rear vertical air direction plate 5b, and the second suction port. Acts as a guide leading to 14. For this reason, it is possible to secure a large amount of blown air sucked into the second suction port 14 through a short circuit, which contributes to increasing the temperature of the blown air to a desired temperature in a short time.

  When the opening / closing plate 15 has a pivot point on the front side of the second suction port 14 and has a rear opening structure in which the rear end of the flat plate 15a is pivoted downward from the back side to the front side, the open state is opened. Since the flat plate 15a is lowered to the front side of the second suction port 14 to block the flow of the blown air whose direction is adjusted by the rear vertical wind direction plate 5b toward the second suction port 14, the second suction port Compared with the opening / closing plate 15 having the front opening structure, the amount of the blowing air sucked in again from 14 is greatly reduced, and the effect of the short circuit, that is, the time required for raising the temperature of the blowing air to the desired temperature is shortened. It will be greatly inferior. The opening / closing plate 15 having a front opening structure is more effective and suitable for rapidly raising the room temperature when the heating operation is started by the short circuit of the blowing air using the second suction port 14.

  When the short circuit of the blowing air using the second suction port 14 is formed in step S6, the heat exchanger temperature Th measured by the control device 30 by the heat transfer tube temperature sensor 31 is predetermined in step S7. It is determined whether or not the temperature is equal to or higher than Ta. If Th ≧ Ta, the process proceeds to step S8, the short circuit mode of the up-and-down wind direction plate 5 is canceled, the short circuit is canceled, and the normal heating operation in step S9 is performed. Migrate to Immediately after proceeding to step S9, the room temperature often has not yet reached the set temperature, and when the routine proceeds to the normal heating operation of step S9, the control device 30 changes the rotational speed of the blower fan 1 to the medium wind mode or While raising to a strong wind mode, the up-and-down wind direction board 5 will be changed to the direction from which a blowing wind comes to a floor surface, ie, a downward blowing. When the short circuit mode of the up-and-down wind direction plate 5 is a direction in which the bottom blows during normal operation, the direction is maintained.

  The temperature Ta described above is set to Ta = 38 ° C. in the indoor unit 100. Even if there is a case where the number of rotations of the blower fan 1 is higher than when a short circuit is formed and the blown wind directly hits a person in the room, the heat exchange is performed. Since the vessel temperature Th is 38 degrees or higher, which is higher than the body temperature, it is possible to avoid that the person who hits feels a cold wind. The temperature Ta = 38 ° C. is an example, and how many degrees C is set is a design matter, but it is desirable to set it higher than the human body temperature in order to eliminate the feeling of cold air.

  In the short circuit mode of the up-and-down wind direction plate 5 in step S3, the front side up-and-down wind direction plate 5a is oriented in the horizontal blowing direction even though the rotational speed of the blower fan 1 during the formation of the short circuit is low, Th <Ta If the blown air that passed through the heat exchanger 2 in this state directly hits the human body, it will give the person a feeling of cold air, so to avoid such a situation, the blown air may directly hit the human body The orientation is low horizontal.

  When the normal heating operation is started in step S9, the indoor unit 100 closes the opening / closing plate 15, and during the subsequent heating operation, the second suction port 14 is closed without opening the opening / closing plate 15. . During the heating operation, since the density of the hot air (warm air) blown out is smaller than the room air, when the adjustment of the up-and-down air direction plate 5 is automatic, the direction is a lower blow that blows out the blown air toward the floor surface. To do. For this reason, when the difference between the room temperature and the temperature set by the user is reduced, the control device 30 reduces the rotational speed of the blower fan 1 to the low wind mode.

  If the second blowing port 14 located behind the blowing port 4 is opened in a state where the blowing air is blown down and the wind speed is low, a short circuit may be formed again. In the heating steady operation state where the difference between the room temperature and the temperature set by the user is small, the short circuit is formed and the blown air is reheated, which reduces the heat exchange capacity and increases the energy consumption. For this reason, the opening / closing plate 15 is closed during the heating operation so that a short cycle to the second suction port 14 is not formed during the normal heating operation.

  However, the short circuit from the second suction port 14 is set so that the direction of the up-and-down wind direction plate 5 is, for example, 20 degrees clockwise with the direction of gravity as the reference line so that the downward blowing direction is in front of the indoor unit 100. Therefore, even after the transition to the normal heating operation in step S8, the second suction port 14 may be opened by opening the opening / closing plate 15.

  Or after transfering to normal heating operation by step S9, the control apparatus 30 may control opening and closing of the opening-and-closing plate 15 according to the rotation speed of the ventilation fan 1. FIG. When the rotational speed of the blower fan 1 is large and the wind speed of the blown air is strong, it is difficult for the blown air to be directly sucked from the second suction port 14. For example, the open / close plate 15 is opened in the strong wind mode and the medium wind mode. In addition, control such as closing the opening / closing plate 15 may be performed in the low wind mode. In either case, it is possible to avoid the formation of a short circuit after the transition to the normal heating operation, and it is possible to improve the circulation of air in the air-conditioned room using the second suction port 14.

  During the cooling operation or the dehumidifying operation, the density of the cool air blown out is larger than the room air, and for that purpose, the control device 30 controls the vertical wind direction plate 5 in the direction in which the blown air is blown horizontally. Therefore, since a short circuit is hardly formed regardless of the rotation speed of the blower fan 1, the open / close plate 15 is always opened and the second suction port 14 is opened during operation.

  Further, although steps S2 to S5 have been described as being performed substantially simultaneously, the control of step S5 may be performed after a while from the end of substantially simultaneous steps S2 to S4. Alternatively, after a while from the end of steps S2 and S3, the control of steps S4 and S5 is performed almost simultaneously, or after the steps S2 and S4 are executed and after a while from the end, the control of steps S3 and S5 is performed. You may make it carry out substantially simultaneously. In any case, a certain time is allowed from the start of driving the compressor in step S2 to the start of rotation of the blower fan 1 in step S5.

  Although the refrigerant circulates in the refrigeration cycle immediately after the start of the compressor, the heat exchanger temperature Th is a temperature close to room temperature, so if the blown air hits the human body, it gives the person a feeling of cold air . For this reason, the blower fan 1 raises the heat exchanger temperature Th to some extent only by the condensation heat of the refrigerant circulating without rotating. Since the blower fan 1 is not rotating, there is no blowout air from the blowout port 4, and blowout air having a low temperature does not hit the human body.

  Although it is a time to wait for a while from the completion of step S2 to the start of step S5, the control may be a predetermined time such as 1 minute, or the heat exchanger temperature Th may be a predetermined temperature Tb (however, Tb It is good also as time until it becomes more than <Ta). In addition, it is necessary to perform either step S3 or S4 almost at the same time as step S2 so that the user can visually recognize that the air conditioner has started in response to an instruction for heating operation. .

  Further, in step S7, it is not determined whether the heat exchanger temperature Th is equal to or higher than a predetermined temperature Ta, but from the instruction for starting the heating operation, that is, from the start of the heating operation of the air conditioner. It may be determined whether or not the elapsed time is equal to or longer than a predetermined time. If the elapsed time is equal to or longer than the predetermined time, the process may proceed to step S8.

  As described above, a short circuit using the second suction port 14 is formed for at least a part of the blowing air at the start of the heating operation, and the air that has passed through the heat exchanger 2 is immediately discharged from the blowing port 4 to the second. Since the air is sucked from the air inlet 14 and reheated by the heat exchanger 2, the time until the temperature of the blown air rises to the temperature desired by the user can be shortened compared with the case where there is no short circuit. Hot air at the temperature desired by the user can be blown out from the outlet in a short time from the operation start instruction. For this reason, the time until the room temperature of the room to be heated reaches the set temperature can be shortened, and a warm environment desired by the user can be provided quickly.

  In a state in which a blowout air short circuit is formed, the front-opening structure opening / closing plate 15 hangs down to the rear end portion of the second suction port 4, and at least part of the blowout air from the blowout port 4 is transferred to the second suction port 14. Since it functions as a guide that leads to a short circuit, it is possible to secure a large amount of blowing air sucked into the second suction port 14 through a short circuit and greatly contribute to shortening the time until the temperature of the blowing air rises to a desired temperature. To do.

  The control at the start of the heating operation according to the third embodiment can be applied not only to the indoor unit 100 but also to the indoor unit 200 of the second embodiment, and a similar effect can be obtained. In addition, even if it is an indoor unit of the structure where the back surface of the heat insulating material 20 faces the suction air passage 16 without providing the heat insulating material cover 21, the back surface of the blowout air passage wall 7 faces the suction air passage 16. Even in the conventional structure, the control at the start of the heating operation according to the third embodiment can shorten the time until the temperature of the blown air rises to a desired temperature, which is desired by the user. The effect that a warm environment can be provided quickly is obtained.

  DESCRIPTION OF SYMBOLS 1 Blower fan, 2 heat exchanger, 3 1st inlet port, 4 outlet port, 5 up-and-down air direction board, 6 outlet air channel, 7 outlet air channel wall, 10 housing | casing, 14 2nd inlet port, 15 opening-and-closing plate, 16 Suction air path, 20 heat insulating material, 21 heat insulating material cover, 25 space, 26a cover plate (plate-like member), 26b rib, 30 control device.

Claims (10)

A first suction port on the upper surface, a blower port is formed on the lower part on the front side, a blower fan inside, a housing having a heat exchanger disposed on the upstream side of the blower fan;
A second suction opening that opens to the bottom surface of the housing behind the outlet;
From the blower fan to the blowout port, a blowout air passage partitioned on the back side by a blowout air passage wall;
A suction air passage formed behind the blowout air passage wall inside the housing and guiding indoor air sucked from the second suction port to the upstream side of the heat exchanger;
Between the blowing air passage wall and the suction air passage, a heat insulating material installed in contact with the back surface of the blowing air passage wall;
An air conditioner indoor unit characterized by comprising: Behind the heat insulating material, provided with a non-foam molded resin heat insulating material cover covering the back surface of the heat insulating material,
The indoor unit of an air conditioner according to claim 1, wherein the heat insulating material cover faces the air intake passage without facing the heat insulating material. The indoor unit of an air conditioner according to claim 2, wherein the heat insulating material cover is fixedly attached to the blowing air passage wall. The indoor unit of an air conditioner according to any one of claims 1 to 3, wherein the heat insulating material is a foamed resin. A first suction port on the upper surface, a blower port is formed on the lower part on the front side, a blower fan inside, a housing having a heat exchanger disposed on the upstream side of the blower fan;
A second suction opening that opens to the bottom surface of the housing behind the outlet;
From the blower fan to the blowout port, a blowout air passage partitioned on the back side by a blowout air passage wall;
A suction air passage formed behind the blowout air passage wall inside the housing and guiding indoor air sucked from the second suction port to the upstream side of the heat exchanger;
A sealed space formed between the blowout air passage wall and the suction air passage, in which air exists, and
The space is
The blowout air passage wall, a plate-like member that is located at a rearward distance from the blowout air passage wall and faces the suction air passage, and protrudes in the front-rear direction to form the blowout air passage wall and the plate-like member An indoor unit of an air conditioner, characterized in that it is surrounded by plate-like ribs connecting members, and the ribs are formed as peripheral walls. The ribs protrude from the blowing air passage wall toward the plate-like member, and from the plate-like member toward the blowing air passage wall, and the tips of the ribs are joined to each other, so that the peripheral wall of the space The indoor unit for an air conditioner according to claim 5, wherein An opening / closing plate that is detachably attached to the housing and rotates to open and close the second suction port,
The open / close plate has a pivot point at a rear end portion, and the front end pivots downward from the front to the rear to open the second suction port. The indoor unit of the air conditioner in any one of 1-6. A first suction port on the upper surface, a blower port is formed on the lower part on the front side, a blower fan inside, a housing having a heat exchanger disposed on the upstream side of the blower fan;
An up-and-down wind direction plate for adjusting the up-and-down direction of the blowing air blown out from the blowing port;
A second suction opening that opens to the bottom surface of the housing behind the outlet;
From the blower fan to the blowout port, a blowout air passage partitioned on the back side by a blowout air passage wall;
A suction air passage formed behind the blowout air passage wall inside the housing and guiding indoor air sucked from the second suction port to the upstream side of the heat exchanger;
An opening and closing plate that rotates to open and close the second suction port;
A control device for controlling the operation of the indoor unit of the air conditioner,
The open / close plate has a pivot point at the rear end, and the front end pivots downward from the front to the rear to open the second suction port,
The control device is
At the time of starting the heating operation of the air conditioner, until the temperature Th of the heat exchanger becomes equal to or higher than a predetermined temperature Ta, or until a predetermined time has elapsed from the start of the heating operation, An air conditioner characterized by opening and opening the second suction port, and adjusting a direction of the up-and-down wind direction plate to form a short circuit in which at least a part of the blowing air flows to the second suction port Indoor unit of the machine. The controller is
The interior of the air conditioner according to claim 8, wherein the direction of the up-and-down wind direction plate is adjusted so that at least a part of the blowing air blows out in the direction of gravity or in a direction inclined rearward from the weight direction. Machine. The controller is
When the temperature Th of the heat exchanger becomes equal to or higher than a predetermined temperature Ta, or when a predetermined time has elapsed from the start of the heating operation, the opening / closing plate is closed, and the opening / closing is performed during the subsequent heating operation. The indoor unit of an air conditioner according to claim 8 or 9, wherein the plate cannot be opened.

Images