JP2008145090A - Indoor unit of air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of a problem due to common use in the case of making one duct in common for achieving two or more purposes. <P>SOLUTION: The indoor unit of the air conditioner includes: a heat exchanger 9 installed in an indoor unit body 3 to cool or heat the air sucked from a suction opening 4 and blown off from a blowout opening 6; a drain pan 13 receiving drain water generated in the heat exchanger 9; an adsorbent 12 installed in the indoor unit body 3 to adsorb moisture in the air and desorb the adsorbed moisture; and a common duct 15 piped between the interior of the indoor unit body 3 and the outdoors to discharge drain water from the drain pan 13 to the outdoors and intake the air supplied to the adsorbent 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an indoor unit of an air conditioner, and more particularly to an indoor unit of an air conditioner having a function of performing humidification using moisture contained in air.

  As described in Patent Document 1 below, an air conditioner indoor unit adsorbs moisture in outdoor air for indoor humidification and then desorbs the adsorbed moisture indoors. There is something that provided. Such an indoor unit of an air conditioner is provided with a plurality of ducts that are drawn out to the outside through a wall in order to suck outdoor air and then exhaust it. Furthermore, in an indoor unit of an air conditioner, it is necessary to drain the drain water condensed by the indoor heat exchanger during the cooling operation to the outside, and the drain pipe for drain draining must be drawn out of the room to the outside.

  Further, as shown in Patent Documents 2 and 3 below, there is an air conditioner provided with a filter cleaning device that scrapes or sucks dust adhering to a filter of an indoor unit and exhausts the dust to the outside. In such an air conditioner, it is necessary to exhaust dust outdoors, and an exhaust duct that communicates from the indoor unit main body to the outside is provided.

  When such a plurality of ducts and water distribution pipes are collectively penetrated into one hole, if the number of ducts to be collected increases, the hole made in the wall becomes larger. On the other hand, if a plurality of ducts and pipes are individually passed through the wall, there is a problem that the number of holes formed in the wall increases. It is desirable that the number of holes in the wall for mounting the indoor unit is small and small.

Therefore, as described in Patent Document 4 below, a drain water pipe for draining drain water generated in a heat exchanger during cooling operation is provided for a ventilation exhaust duct provided in an indoor unit of an air conditioner. In addition, an air conditioner indoor unit is known in which the number of holes in the wall is reduced and the number of holes in the wall is reduced.
Japanese Patent No. 2998513 JP 2004-138329 A JP 2006-105590 A JP 2004-132666 A

  However, the indoor unit of the air conditioner described in Patent Document 4 described above uses an exhaust duct for ventilation also for drain water discharge, and when applied to an air conditioner that performs humidification and exhaust of filter dust, There is a problem.

  When drain water is drained and the inner surface of the common duct is wet, dust removed from the filter during indoor unit filter cleaning is exhausted outdoors and a large amount of dust is exhausted. Is mixed in the drain water, adheres to the inner surface of the passage in the exhaust duct, and is clogged with dust.

  Moreover, in the indoor unit of an air conditioner, when the number of ducts located in an indoor unit increases, the process for piping these ducts in an indoor unit will require time and effort.

  The present invention has been made in order to solve such problems, and its purpose is to reduce the number of holes in the wall and to reduce the size of the holes with one duct having two or more objects. An object of the present invention is to provide an indoor unit for an air conditioner that prevents the occurrence of problems due to the commonality even when the standardization is achieved.

  Another object of the present invention is to provide an indoor unit of an air conditioner that can easily perform duct piping processing in the indoor unit without taking time and effort.

  The first feature according to the embodiment of the present invention is that in the indoor unit of the air conditioner, a suction port through which indoor air is sucked and a blow-out port through which the air sucked from the suction port blows into the room is formed. An indoor unit main body disposed in the room, an air conditioning fan installed in the indoor unit main body, generating an air flow sucked from the inlet and blown out from the outlet, and installed in the indoor unit main body A heat exchanger that cools or heats air that is sucked in from the suction port and blown out from the blowout port, a drain pan that receives drain water generated in the heat exchanger, and provided between the suction port and the heat exchanger A filter that captures dust in the indoor air sucked from the suction port, a filter cleaning device that removes dust adhering to the filter, and a filter installed in the main body of the indoor unit. The adsorbent for adsorbing and desorbing the adsorbed moisture, the exhaust duct piped between the interior of the indoor unit main body and the outdoor, and the air sucked from the suction side are taken out of the room through the exhaust duct. An intake / exhaust fan for exhausting, a common duct that is piped between the inside of the indoor unit main body and the outside, and that drains drain water from the drain pan to the outside and sucks air supplied to the adsorbent, and The suction side of the intake / exhaust fan is connected to the filter cleaning device to suck in air containing dust, or connected to a common duct via the adsorbent, and the air after moisture is adsorbed by the adsorbent Switching means capable of switching whether to inhale or not.

  The second feature according to the embodiment of the present invention is that, in the indoor unit of the air conditioner, a suction port through which indoor air is sucked and a blow-out port through which the air sucked from the suction port blows into the room is formed. An indoor unit main body disposed in the room, an air conditioning fan installed in the indoor unit main body, generating an air flow sucked from the inlet and blown out from the outlet, and installed in the indoor unit main body , A heat exchanger that cools or heats the air sucked from the inlet and blown from the outlet, a drain pan that receives drain water generated by the heat exchanger, and installed in the indoor unit main body, An adsorbent that adsorbs moisture and desorbs the adsorbed moisture, an intake duct that sucks air from the outside toward the adsorbent, and an exhaust duct that exhausts the air that has passed through the adsorbent to the outside When Wherein the intake duct and the exhaust duct is that they are both fixed to the drain pan.

  ADVANTAGE OF THE INVENTION According to this invention, drainage of drain water can be performed favorably by reducing the number of ducts and piping between indoor and outdoor by using a common duct.

  Moreover, according to this invention, the piping process of the duct in an indoor unit can be easily performed without taking an effort.

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

  The indoor unit 1 of the air conditioner according to the present embodiment has an indoor unit main body 3 attached to the inner surface of a wall 2 that partitions the room from the outside as shown in FIGS. A plurality of suction ports 4 are formed in the front surface portion and the upper surface portion. A blower outlet 6 whose opening degree can be adjusted by a louver 5 is formed in the lower part of the indoor unit body 3.

  In the indoor unit body 3, an air filter 7, a filter cleaning device 8, a heat exchanger 9, a cross flow fan 10 that is an air conditioning fan, an intake / exhaust fan 11, an adsorbent 12, a drain pan 13, A controller 14 is installed. A common duct 15, an exhaust duct 16, and two refrigerant pipes 17 and 18 are piped through the wall 2 between the indoor unit main body 3 and the outdoor. FIG. 2 is a schematic view for understanding the air flow in each component, and is slightly different from the actual arrangement of each component in the indoor unit body 3.

  The air filter 7 is disposed at a position facing the suction port 4 between the front surface portion and the upper surface portion of the indoor unit body 3 and is formed in a mesh shape. When dust is contained in the air sucked from the suction port 4, the dust is captured by the air filter 7 in the process in which the air passes through the air filter 7.

  The filter cleaning device 8 includes a brush 8 a and a storage box 8 b, is disposed between the air filter 7 and the indoor unit body 3, and is provided so as to be movable along the surface of the air filter 7. When the filter cleaning device 8 moves along the surface of the air filter 7, the brush 8a is rotationally driven to remove dust adhering to the air filter 7, and the removed dust is stored in the storage box 8b. During cleaning by the filter cleaning device 8, a motor (not shown) that moves the filter cleaning device 8 and a motor (not shown) that drives the brush 8a to rotate are driven. And the dust accommodated in the accommodation box 8b is discharged | emitted by the air supply / exhaust fan 11 outdoors. Note that the filter cleaning apparatus may be a system that uses the air supply / exhaust fan 11 to suck dust on the filter surface while the suction port moves and sucks the dust on the filter surface and exhausts it to the outdoors.

  The heat exchanger 9 is connected to the outdoor heat exchanger provided in an outdoor unit (not shown) installed outside by two refrigerant pipes 17 and 18, and the refrigerant flows inside. The cooling operation state and the heating operation state can be switched. The heat exchanger 9 cools the air flowing around the heat exchanger 9 at a low temperature during the cooling operation, and heats the air flowing around the heat exchanger 9 at a high temperature during the heating operation.

  The cross-flow fan 10 is a cross-flow fan formed in a long cylindrical shape, and is installed in parallel with the longitudinal direction of the adsorbent 12 along the longitudinal direction in the indoor unit main body 3. That is, when the indoor unit 1 is attached to the wall 2, the cross flow fan 10 installed in the indoor unit body 3 is oriented in a horizontal direction in which the longitudinal direction of the cross flow fan 10 is parallel to the wall 2. . A motor 19 that rotates the cross flow fan 10 is connected to the cross flow fan 10. When the crossflow fan 10 is driven, indoor air is sucked into the indoor unit main body 3 from the suction port 4, and the sucked air is cooled by passing through the periphery of the heat exchanger 9 to become cold air or heated. It becomes warm air, and cool air or warm air blows out into the room from the outlet 6.

  The intake / exhaust fan 11 is connected to a motor 20 that rotationally drives the intake / exhaust fan 11. When the intake / exhaust fan 11 is rotationally driven, outdoor air is sucked into the indoor unit main body 3, and air sucked from the outdoor or indoor air is discharged to the outdoor. Intake of air from the outside is performed using a common duct 15 piped through the wall 2 between the indoor unit body 3 and the outdoor. The air is exhausted to the outside through an exhaust duct 16 piped through the wall 2 between the indoor unit body 3 and the outdoor. The common duct 15 has two functions as a drain pipe for draining drain water from the drain pan 13 to the outside and an intake duct for sucking air supplied to the adsorbent body 12 from the outside.

  The adsorbent 12 has a function of adsorbing moisture in the air and then desorbing the adsorbed moisture into the air by increasing the temperature. As shown in FIGS. 7 and 8, the adsorbing body 12 includes an adsorbing plate unit 21 and a holding body 22.

  The adsorbing plate unit 21 has a plurality of adsorbing plates 23 that are formed in a rectangular plate shape and can adsorb and desorb moisture, and these adsorbing plates 23 face each other and face each other. Are connected to each other with a gap allowing ventilation. The adsorption plate 23 is formed of a substrate made of paper or the like and adsorbent particles such as zeolite coated on the surface of the substrate. The adsorbent adsorbs moisture at a low temperature (room temperature) and desorbs the adsorbed moisture at a high temperature.

  The plurality of suction plates 23 are connected by fixing both ends in the longitudinal direction of the suction plates 23 with ring-shaped frames 24, and the outer shape of the suction plate unit 21 is a columnar shape.

  A partition plate 25 arranged in parallel with the suction plate 23 is fixed to the ring-shaped frame 24. The partition plate 25 is arranged with both ends fixed to the diameter portions of the pair of ring-shaped frames 24, and divides the suction plate 23 into two groups and also serves as reinforcement of the suction plate unit 21. A rotation shaft 26 extending outward along the longitudinal direction of the partition plate 25 is fixed to the center of the side surface in the longitudinal direction of the partition plate 25.

  The holding body 22 holds the suction plate unit 21 so as to be rotatable around the center line of the rotation shaft 26. The holding body 22 includes a first cover portion 27 that hermetically covers an outer peripheral portion in a direction along the longitudinal direction of a part of the suction plates 23 in the suction plate unit 21 to be held, and another part of the suction plate unit 21 to be held. The suction plate 23 has a pair of second cover portions 28 that hermetically cover both ends in the longitudinal direction. The first cover portion 27 is formed in a semi-cylindrical shape that covers a range of about 180 ° in the circumferential direction of the suction plate unit 21. The second cover part 28 is formed in a semicircular shape. The second cover portion 28 is formed with a support hole 29 that rotatably supports the rotary shaft 26.

  The adsorbent 12 is formed with a first air passage 30 and a second air passage 31 through which air can flow. The first air passage 30 is formed so as to be surrounded by the first cover portion 27 and a part of the suction plates 23, and air can be passed between the suction plates 23 in the longitudinal direction (direction of arrow A shown in FIG. 7). It is said that. The second air passage 31 is formed by being surrounded by the pair of second cover portions 28 and another part of the suction plates 23, and a direction perpendicular to the longitudinal direction of the suction plates 23 (see FIG. 7 and the direction of arrow B shown in FIG. 1). The partition plate 25 is positioned between the first air passage 30 and the second air passage 31 so that air does not travel between the first air passage 30 and the second air passage 31. I have to.

  As shown in FIGS. 1 and 2, when the adsorption body 12 is installed in the indoor unit body 3, the holding body 22 is held in a fixed position by a holding mechanism (not shown), and the suction plate unit 21 is attached to the rotating shaft 26. A motor 32 that is driven to rotate about the center line of the rotary shaft 26 is connected via a speed reduction mechanism 33. The speed reduction mechanism 33 is configured by meshing a plurality of gears.

  The drain pan 13 is a dish-shaped member that receives drain water generated in the heat exchanger 9 during cooling operation, and is formed in a long shape along the center line direction of the cross-flow fan 10. Is arranged.

  As described above, the common duct 15 is piped between the interior of the indoor unit body 3 and the outside through the wall 2, and drainage of drain water from the drain pan 13 to the outside and air supplied to the adsorbent body 12. Intake from outside is performed.

  One end of the common duct 15 located in the indoor unit main body 3 is connected to one end side in the longitudinal direction of the drain pan 13. As shown in FIG. 6, this connection is performed by the common duct 15 passing through the bottom surface of the drain pan 13 and being fixed and held on the drain pan 13.

  The front end side of the common duct 15 that penetrates the bottom surface of the drain pan 13 protrudes upward from the bottom surface of the drain pan 13. A first passage 34 that guides drain water in the drain pan 13 into the common duct 15 is formed on the front end side of the common duct 15 that protrudes upward from the bottom surface of the drain pan 13. Furthermore, a second passage 35 that guides air sucked from the outside to the first air passage 30 of the adsorbent 12 is connected to the front end side of the common duct 15. The second passage 35 extends toward the adsorbent body 12, and a tip portion thereof is connected to an inlet 30 </ b> A on one end side of the first air passage 30 of the adsorbent body 12.

  Comparing the flow area “S1” of the first passage 34 and the flow area “S2” of the second passage 35, the flow area “S2” of the second passage 35 is the flow area “S1” of the first passage 34. It is set larger than “”.

  An opening / closing mechanism 36 that opens and closes the first passage 34 is provided at the distal end side of the common duct 15. The opening / closing mechanism 36 includes a ring body 37 that is rotatably fitted to the outer peripheral portion on the front end side of the common duct 15, and a motor (not shown) that rotates the ring body 37. A hole 38 is formed in the ring body 37, and as shown in FIGS. 4 and 5A, the ring body 37 is rotated to a position where the hole 38 and the first path 34 communicate with each other, whereby the first path is formed. 34 is opened. Further, as shown in FIG. 5B, the first passage 34 is closed by rotating the ring body 37 to a position where the hole 38 and the first passage 34 do not communicate with each other.

  A branch portion 41 is formed at a portion of the common duct 15 located outside the room, and is branched into an intake portion 39 for taking in outdoor air and a drain portion 40 through which drain water flows. The intake portion 39 is formed on the upper side of the branch portion 41.

  An exhaust duct 16 is fixed and held at the other end of the drain pan 13 in the longitudinal direction. As shown in FIG. 6, this holding is performed by passing the exhaust duct 16 through a through hole 61 surrounded by a cylindrical rising portion 60 provided on the bottom surface of the drain pan 13.

  An end portion of the exhaust duct 16 located in the indoor unit main body 3 is connected to the outlet 30 </ b> B of the first air passage 30 of the adsorbent 12. Further, the exhaust duct 16 is connected with a cleaning duct 42 that communicates with the storage box 8 b of the filter cleaning device 8. A damper 43 that opens and closes the cleaning duct 42 is provided in the cleaning duct 42. A damper 44 that opens and closes the exhaust duct 16 is provided between the outlet 30 </ b> B in the exhaust duct 16 and the connecting portion of the cleaning duct 42. These dampers 43 and 44 constitute switching means and are opened and closed by an actuator (not shown) such as a motor or a solenoid. Since the humidifying operation is performed during the operation of the air conditioner and the filter cleaning is performed after the air conditioner is stopped, the dampers 43 and 44 are not simultaneously opened.

  The controller 14 controls the control object in the indoor unit body 3. As shown in FIG. 9, the controller 14 includes a motor 32 that rotationally drives the suction plate unit 21 of the adsorption body 12, a motor 18 that rotationally drives the intake / exhaust fan 11, and a motor 19 that rotationally drives the cross-flow fan 10. A motor 45 that drives the louver 5, actuators 48 and 49 such as motors that drive the dampers 43 and 44, various sensors such as a temperature sensor, and a remote controller 46 that operates the operating state of the air conditioner. A light receiving unit 47 that receives an infrared signal is connected. Various buttons (cooling, heating, humidification, operation / stop, set temperature, air volume, etc.) operated by the user are arranged on the remote control 46, and when each button operation is performed, an infrared ray corresponding to each operation content is provided. A signal is output.

  An outline of the control performed by the controller 14 will be described based on the flowchart of FIG. This control includes control for prohibiting intake air from the common duct 15, that is, humidification operation, when drain water is drained. Humidification operation is performed at the time of heating, and there is no possibility that the user will request cooling operation and humidification operation at the same time. ing.

  The controller 14 monitors whether or not a signal is input from the remote controller 46 (S1). If there is an input of a signal from the remote controller 46 (YES in S1), it is determined whether or not the signal is a humidification start signal (S2).

  If it is determined in step S2 that the signal is not a humidification start signal (NO in S2), it is determined whether or not it is a stop signal (S3). Examples of the signal that is determined not to be a humidification start signal in step S2 include a stop signal, a heating operation start signal, a cooling operation start signal, and a set temperature change signal.

  If it is determined in step S2 that the signal is a humidification start signal (YES in S2), it is determined whether or not the current operating state of the air conditioner is a cooling operation (S4). It means that drain water is generated in the heat exchanger 9 during cooling operation, and drain water is drained through the common duct 15.

  If it is determined in step S4 that the current operation state is not the cooling operation (NO in S4), the intake / exhaust fan 11 is driven, and the humidification operation is started by sucking outdoor air through the common duct 15. (S5).

  On the other hand, if it is determined in step S4 that the current operating state is the cooling operation (YES in S4), the humidification start signal is canceled (S6), and drain water is drained here. If it is, the means for prohibiting intake from the common duct 15 is executed. That is, the cooling operation has priority over the humidifying operation.

  In such a configuration, the first passage 34 is opened by the opening / closing mechanism 36 during the cooling operation. That is, the ring body 37 is rotated to a predetermined position, and the hole 38 formed in the ring body 37 and the first passage 34 are communicated with each other as shown in FIGS. 4 and 5A.

  For this reason, when drain water generated in the heat exchanger 9 flows down on the drain pan 13 during the cooling operation, the drain water flows into the common duct 15 through the hole 38 and the first passage 34, and the common duct 15. It flows through the inside and the drain part 40 and is drained to the outside.

  During the humidifying operation, the first passage 34 is closed by the opening / closing mechanism 36 in step S5 shown in the flowchart of FIG. 10, and the intake / exhaust fan 11 is driven. During the humidification operation, the damper 43 in the cleaning duct 42 is closed and the damper 44 in the exhaust duct 16 is opened. The first passage 34 is closed by the opening / closing mechanism 36 when the ring body 37 rotates to the position shown in FIG. 5B and the communication between the hole 38 of the ring body 37 and the first passage 34 is blocked. Is called.

  When the intake / exhaust fan 11 is driven in a state where the first passage 34 is closed by the opening / closing mechanism 36, the damper 43 is closed and the damper 44 is opened, the outdoor air is sucked from the intake section 39, and the common duct 15 and the second passage 35 to the adsorbent 12 side. The air flowing through the common duct 15 and the second passage 35 flows into the first air passage 30 of the adsorbent 12 from the inlet 30A. In the process in which air sucked from outside flows through the first air passage 30 of the adsorbent body 12, moisture in the air is adsorbed by the adsorption plate 23 located in the first air passage 30.

  The air that has passed through the first air passage 30 is reduced in humidity by moisture being adsorbed by the adsorption plate 23, and the air whose humidity has been reduced is exhausted to the outside through the exhaust duct 16.

  During the humidifying operation, the motor 32 is driven every preset time, and the suction plate unit 21 rotates about 180 ° around the rotation shaft 26. By this rotation, the adsorption plate 23 which is located in the first air passage 30 and has been adsorbed with moisture before the rotation moves into the second air passage 31 and into the second air passage 31 before the rotation. The suction plate 23 that has been positioned moves into the first air passage 30. The humidification operation is performed in winter when the heating operation is performed, and a part of the warm air heated by the heat exchanger 9 flows in the second air passage 31 in the direction indicated by the arrow B in FIG. As a result, the adsorption plate 23 located in the second air passage 31 is heated, moisture is desorbed from the adsorption plate 23, and the desorbed moisture is sucked into the heat exchanger 9 side by the cross flow fan 10. It blows out into the room from the blower outlet 6, and the room is humidified.

  On the other hand, when it is determined in step S3 shown in the flowchart of FIG. 10 that the received signal is a stop signal (YES in S3), the air conditioning operation is stopped (S7). Subsequently, it is determined whether or not filter cleaning is necessary (S11). The determination of whether or not cleaning is necessary is generally a determination method such as whether or not the accumulated operation time of the air conditioner has exceeded a predetermined time (for example, 50 hours). If it is determined that the filter needs to be cleaned, the filter cleaning device 8 is driven to remove dust on the filter surface (S9). And the exhaust operation to the outdoors of dust is performed (S10). Here, the damper 43 in the cleaning duct 42 is opened, the damper 44 in the exhaust duct 16 is closed, and the intake / exhaust fan 11 is driven. As a result, the dust removed from the air filter 7 and stored in the storage box 8b flows through the cleaning duct 42 and the exhaust duct 16 and is discharged to the outside. A small opening 8c is provided on the side opposite to the connection side of the cleaning duct 42 of the storage box 8b, and the air in the indoor unit sucked from the opening 8c by the operation of the intake / exhaust fan 11 is stored in the storage box. The air is exhausted from the exhaust duct 16 to the outside through the cleaning duct 42 and the intake / exhaust fan 11. Therefore, in the dust exhaust operation, the common duct 15 is not used, and the dust does not flow out to the common duct 15. Thereafter, it is determined whether or not the cleaning has been completed after a predetermined time has elapsed (S11). If the cleaning operation including the dust exhaust operation is completed (YES in S11), the intake / exhaust fan 11 is stopped (S12). End driving.

  If it is determined in step S3 that the signal is not a stop signal (NO in S3), control according to the input signal is executed (S13). If it is determined in step S8 that cleaning is not necessary (NO in S8), the process ends.

  In this indoor unit 1, drainage of the drain water to the outside and intake of humidifying air from the outside are performed using a single common duct 15, and therefore, the common duct 15 and the exhaust duct 16 are piped. Therefore, the number of holes in the wall 2 can be reduced, and the size of the holes to be opened can be reduced.

  In addition, the common duct 15 is used for drain water drainage during cooling operation in summer and the like and intake air from outside of the humidifying air in winter and the like. For this reason, there is no intake of air from outside the room during drain water drainage or immediately after drain water drainage, and dust contained in the air enters the drain water or in the air being sucked It is possible to prevent the occurrence of a situation where dust does not adhere to the inner surface of the common duct 15 that gets wet and dust adheres to the common duct 15 and the common duct 15 becomes clogged.

  Further, when air is taken in from the outside, since there is no drain water in the common duct 15, the passage resistance of the air to be taken in can be reduced, and the air intake efficiency can be increased.

  Furthermore, since there is no drain water in the common duct 15 during intake of air from the outside, it is possible to prevent the occurrence of a backflow of drain water due to the intake air.

  Moreover, since the indoor unit 1 is provided with means for prohibiting intake air from the common duct 15 when drain water is drained, the common duct is provided when drain water is drained. Intake from 15 can be reliably prevented.

  That is, the exhaust duct 16 is used for both the outdoor exhaust of humidifying air and the outdoor exhaust of dust from the filter cleaning device 8, the common duct 15 is also used for the suction of humidifying air and the drain water distribution pipe, and the air supply / exhaust fan By using 11 for both humidification and outdoor discharge of dust, it is possible to obtain an indoor unit 1 that has both simple humidification and filter cleaning, and that is efficient and does not cause clogging of the duct.

  In addition, switching when the common duct 15 is used for drain water drainage and humidification air intake can be reliably performed by the opening / closing mechanism 36 that opens and closes the first passage 34.

  A first passage 34 that guides drain water to the common duct 15 and a second passage 35 that guides air sucked from outside to the adsorbent 12 are provided on the distal end side of the connecting portion of the common duct 15 to the drain pan 13. Therefore, by opening the first passage 34 during the humidifying operation, in addition to the air sucked from the outside, the indoor air sucked from the first passage 34 can be supplied to the adsorbent body 12 side. Therefore, when the humidity of the outdoor air is low, humidify the room using the moisture of the indoor air as necessary, and maintain the humidification performance even when the humidity of the outdoor air is low. Can do.

  Comparing the flow area “S1” of the first passage 34 and the flow area “S2” of the second passage 35, the flow area “S2” of the second passage 35 is the flow area “S1” of the first passage 34. It is set larger than “”. For this reason, as shown in FIG. 5B, when the first passage 34 is closed and the outdoor air is sucked in, the intrusion of air from the gap portion of the first passage 34 can be suppressed. The intake performance can be improved.

  A branch portion 41 that is branched into an intake portion 39 and a drain portion 40 is formed in a portion of the common duct 15 that is located outside the room. Since the intake portion 39 is located on the upper side of the branch portion 41, It is possible to prevent the drain water from leaking out from the intake portion 39 during drainage, and drain the drain water through the drain portion 40 to a target drainage point.

  With respect to the common duct 15 having the functions of the exhaust duct 16 and the intake duct and the piping processing in the indoor unit body 3, the common duct 15 is held on one end side of the drain pan 13, and the exhaust duct 16 is placed on the other end side of the drain pan 13. Fixed and held. In this way, since the drain pan 13 is used as a holding member that holds the common duct 15 and the exhaust duct 16, duct processing in the indoor unit body 3 can be easily performed without taking time and effort.

It is a vertical side view which shows the indoor unit of the air conditioner which concerns on one embodiment of this invention. It is the horizontal sectional view. It is a perspective view which shows the internal structure of an indoor unit. It is a vertical side view which shows the part of an opening-and-closing mechanism. It is the horizontal sectional view. It is a vertical side view which shows the holding structure of the common duct and exhaust duct to an oil pan. It is a perspective view which shows an adsorbent. It is a disassembled perspective view which shows an adsorbent. It is a block diagram which shows the electrical connection structure of the indoor unit of an air conditioner. It is a flowchart explaining the control which prohibits the air supply from the outdoor at the time of drainage of dress water.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 3 ... Indoor unit main body, 4 ... Suction port, 6 ... Air outlet, 7 ... Filter, 8 ... Filter cleaning apparatus, 9 ... Heat exchanger, 10 ... Air conditioning fan, 11 ... Intake / exhaust fan, 12 ... Adsorber, 13 DESCRIPTION OF SYMBOLS ... Drain pan, 15 ... Common duct (intake duct), 16 ... Exhaust duct, 34 ... First passage, 35 ... Second passage, 36 ... Opening / closing mechanism, 39 ... Intake part, 40 ... Drain part, 41 ... Branch part, 43 44 ... Switching means

Claims (7)

An indoor unit body that is formed with an air inlet into which indoor air is sucked and an air outlet through which air sucked from the air inlet is blown into the room;
An air conditioning fan that is installed in the indoor unit main body and generates a flow of air that is sucked from the suction port and blown out from the outlet;
A heat exchanger that is installed in the indoor unit main body, cools or heats the air sucked from the suction port and blown out from the blowout port;
A drain pan for receiving drain water generated in the heat exchanger;
A filter that is provided between the suction port and the heat exchanger and captures dust in indoor air sucked from the suction port;
A filter cleaning device for removing dust adhering to the filter;
An adsorbent that is installed in the indoor unit main body and performs adsorption of moisture in the air and desorption of adsorbed moisture;
An exhaust duct piped between the interior of the indoor unit body and the outside;
An intake / exhaust fan that exhausts air sucked from the suction side to the outside through the exhaust duct;
A common duct that is piped between the interior of the indoor unit main body and the outside, and that drains drain water from the drain pan to the outside and sucks air supplied to the adsorbent, and
The suction side of the intake / exhaust fan is connected to the filter cleaning device to suck in air containing dust, or connected to a common duct via the adsorbent, and the air after moisture is adsorbed by the adsorbent Switching means capable of switching whether to inhale, and
An air conditioner indoor unit comprising:   One end of the common duct is connected to the drain pan, and a first passage that guides drain water to the common duct at a front end side of a connection portion of the common duct to the drain pan, and air sucked from outside is adsorbed by the adsorber. The indoor unit of the air conditioner according to claim 1, further comprising a second passage that leads to the air passage.   The indoor unit of an air conditioner according to claim 2, wherein the common duct is provided with an opening / closing mechanism for opening and closing the first passage.   The indoor unit of the air conditioner according to claim 2 or 3, wherein a flow passage area of the second passage is set larger than a flow passage area of the first passage.   A branch portion is formed in a portion of the common duct that is located outside the room, and a branch portion that is branched into an intake portion where outdoor air is taken in and a drain portion through which drain water flows is formed, and the intake portion is located on an upper side of the branch portion. The indoor unit of an air conditioner according to any one of claims 1 to 4, wherein   The indoor unit for an air conditioner according to any one of claims 1 to 5, further comprising means for prohibiting intake air from the common duct when drain water is drained. An indoor unit body that is formed with an air inlet into which indoor air is sucked and an air outlet through which air sucked from the air inlet is blown into the room;
An air conditioning fan that is installed in the indoor unit main body and generates a flow of air that is sucked from the suction port and blown out from the outlet;
A heat exchanger that is installed in the indoor unit main body, cools or heats the air sucked from the suction port and blown out from the blowout port;
A drain pan for receiving drain water generated in the heat exchanger;
An adsorbent that is installed in the indoor unit main body and performs adsorption of moisture in the air and desorption of adsorbed moisture;
An intake duct for sucking air from outside to the adsorbent,
An exhaust duct for exhausting the air after passing through the adsorbent to the outside;
With
An indoor unit of an air conditioner, wherein both the intake duct and the exhaust duct are fixed to the drain pan.

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