JP5800737B2 - Air conditioner indoor unit and air conditioner - Google Patents

Description

  The present invention relates to an indoor unit and an air conditioner of an air conditioner including a drain pump that discharges condensed water.

  In general, in an indoor unit of an air conditioner, during cooling operation, water vapor in the air condenses on the surface of the heat exchanger to become water, and this water is drained into a drain pan installed below the heat exchanger. Accumulate. The water accumulated in the drain pan is naturally discharged out of the indoor unit from the drain port of the drain pan, or is discharged out of the indoor unit by a drain pump installed in the drain pan.

  Conventionally, in an air conditioner equipped with such a drain pump, `` Install an ultrasonic sensor at a position where the distance to the drain water surface can be measured, and connect this ultrasonic sensor to the air conditioner control microcomputer via the water surface distance measurement circuit In addition to constantly inputting the distance to the water surface, a drain pump is connected to the microcomputer via a drain pump drive circuit, and the drain pump is controlled to be turned on and off in response to changes in the water level in the microcomputer. A technique of “stopping the operation of the air conditioner depending on the change in the water level” has been proposed (see, for example, Patent Document 1).

JP-A-5-141686 (second page, FIG. 1)

  In the air conditioner of the above-mentioned patent document 1, since the drain water in the drain pan is not properly discharged, the operation of the air conditioner is stopped when the water level exceeds a certain level. In this case, the maintenance person drains the drain water from the drain pan, and if necessary, performs repair work such as replacing the faulty drain pump or cleaning the drainage channel, but operates the air conditioner until this repair work is performed. This is not possible and indoor comfort deteriorates. For example, if operation is stopped during a store operation such as a restaurant, if the maintenance staff cannot immediately perform recovery work, the comfort will deteriorate over a long period of time during the operation that requires comfort. This will continue.

  Here, as one of the causes of the drainage of the drain water being delayed, bacteria and molds propagate in the drain water in the drain pan, and foreign matters such as slime and biofilm are generated inside the drain pump and the drain pipe. One that causes clogging. In general, since bacteria easily propagate at 30 to 40 ° C. and fungi at 25 to 35 ° C., it is considered that bacteria and molds propagate in the drain water accumulated in the drain pan when the air conditioner is stopped.

  There is an attempt to install antibacterial agents and fungicides in the drain pan in order to suppress the generation of fungi and mold, but a type of bacteria that cannot be sterilized with antibacterial agents creates a biofilm on the surface of the antibacterial agent, and the biofilm There is also a problem that the antibacterial agent can not exhibit its antibacterial performance because the dissolution of the antibacterial agent is hindered.

  The present invention has been made against the background of the above problems, and provides an indoor unit and an air conditioner of an air conditioner that can suppress clogging of a drainage path due to foreign matter in a drain pan.

An indoor unit of an air conditioner according to the present invention is an indoor unit of an air conditioner that has a refrigeration cycle and is capable of at least one of a cooling operation and a dehumidifying operation, the drain pan for storing drain water, and the reservoir in the drain pan. A drain pump that sucks in and discharges the drained water, a temperature detecting means for detecting the temperature in the vicinity of the indoor unit, a humidity detecting means for detecting the humidity in the vicinity of the indoor unit, and a timing means In the state where at least one of the cooling operation and the dehumidifying operation is stopped , when a drainage abnormality from the drain pan occurs, the detected temperature of the temperature detecting means at that time, the detected humidity of the humidity detecting means, and Sukunakutomoizu of elapsed time since stop the cooling operation and the dehumidifying operation is measured by the clock means to the drain abnormality occurs Or a includes an abnormality history recording means for recording as an abnormality log, and a control means for controlling the operation of the drain pump, said control means, based on the abnormality history, the detected temperature, said sensing humidity, and for at least one of the elapsed time, after the drainage abnormality calculates the conditions used for determining whether prone, the error history is recorded and the condition is calculated, the cooling operation and when stopped for the dehumidifying operation, the detection temperature of the temperature sensing means, said detecting humidity of the humidity detecting means, and elapsed since stop the cooling operation and the dehumidifying operation is measured by the clock means either time, if the previous meet Kijo matter, in which operating the drain pump.

  According to the present invention, the drain pump is operated when the bacteria propagation condition is satisfied while the cooling operation and the dehumidifying operation are stopped. For this reason, a flow is generated in the drain water remaining in the drain pan, and generation of foreign matters such as slime and biofilm can be suppressed. Therefore, clogging of the drainage path due to foreign matters can be suppressed.

It is a schematic block diagram of the indoor unit of the air conditioner according to Embodiment 1. 2 is a functional block diagram of the air conditioner according to Embodiment 1. FIG. It is a schematic block diagram of the indoor unit of the air conditioner concerning Embodiment 2. It is a figure explaining the water inlet and wall of the drain pump which concerns on Embodiment 2. FIG. It is a schematic block diagram of the indoor unit of the air conditioner which concerns on Embodiment 3. FIG.

  Hereinafter, an air conditioner according to the present invention will be described with reference to the drawings. In addition, this invention is not limited by the form of drawing shown below.

Embodiment 1 FIG.
The air conditioner according to Embodiment 1 includes an indoor unit installed in a room that is an air-conditioning target space and having an indoor heat exchanger inside, and an outdoor unit installed outdoors and having an outdoor heat exchanger inside. . This air conditioner has a refrigeration cycle in which a compressor, an indoor heat exchanger, an expander, and an outdoor heat exchanger are sequentially connected by refrigerant piping, and performs a cooling operation, a dehumidifying operation, and a heating operation. . The air conditioner performs a cooling operation and a dehumidifying operation in which the indoor heat exchanger functions as an evaporator (cooler), and has a function of discharging drain water accumulated in the drain pan by the dehumidification in the room during the cooling operation and the dehumidifying operation. Have. Since this Embodiment 1 has the characteristic in the structure regarding discharge | emission of drain water, below, it demonstrates focusing on a characteristic part.

[Configuration of air conditioner]
1 is a schematic configuration diagram of an indoor unit of an air conditioner according to Embodiment 1. FIG.
In the indoor unit of the air conditioner, an indoor heat exchanger 1, a drain pan 2 provided below the indoor heat exchanger 1, a drain pump 3, a drain pipe 4 connected to the drain pump 3, and the drain pan 2 A water level sensor 5 for detecting the water level is provided. The operation of the drain pump 3 and the water level sensor 5 is controlled by the control device 10.

  The drain pan 2 is a container that has a storage space inside and can receive water dripped from the indoor heat exchanger 1 and store it as drain water W1.

  The drain pump 3 has a motor (not shown) inside, and sucks water in the drain pan 2 from a suction port 31 provided on the lower surface. The suction port 31 of the drain pump 3 is installed at a predetermined height position in the drain pan 2 soaking in the drain water W1. The drain pump 3 has a discharge port 32 for discharging the sucked water, and the drain pipe 4 is connected to the discharge port 32.

  The drain pipe 4 has a flow path through which water can flow, one end side is connected to the discharge port 32 of the drain pump 3, and the other end side is opened to the outside of the indoor unit (for example, outdoors). Yes. The drain water W1 in the drain pan 2 pumped up by the drain pump 3 passes through the drain pipe 4 and is discharged to the outside of the indoor unit.

  The water level sensor 5 is a sensor for detecting the water level in the drain pan 2. Any device such as an ultrasonic water level sensor or an optical water level sensor can be used as the water level sensor 5 as long as it can detect the water level. Information detected by the water level sensor 5 is output to the control device 10.

FIG. 2 is a functional block diagram of the air conditioner according to Embodiment 1.
The air conditioner includes a compressor 21 and an expander 22 that constitute a part of the refrigeration cycle, an indoor fan 23 provided in the indoor unit, an outdoor fan 24 provided in the outdoor unit, a suction temperature sensor 6, And a humidity sensor 7. The control device 10 includes a control unit 11, a time measuring unit 12, and a storage unit 13 that stores an abnormality history 14.

  The suction temperature sensor 6 is provided in the vicinity of the indoor air suction port formed in the indoor unit, and detects the temperature of the air sucked into the indoor unit on the upstream side of the indoor heat exchanger 1. The temperature information detected by the suction temperature sensor 6 is output to the control unit 11 and used for operation control of the refrigeration cycle. In the first embodiment, the suction temperature sensor 6 functions as the temperature detection means of the present invention.

  The humidity sensor 7 is provided in the indoor unit and detects humidity (relative humidity or absolute humidity) on the downstream side (exit side) of the indoor heat exchanger 1. The humidity information detected by the humidity sensor 7 is output to the control unit 11 and used for operation control of the refrigeration cycle. In the first embodiment, the humidity sensor 7 functions as the humidity detecting means of the present invention.

  The time measuring unit 12 is a time measuring unit that measures time based on a signal from the control unit 11 and outputs a measurement result to the control unit 11.

  The memory | storage part 13 is a memory | storage device which memorize | stores the various data and control program for the control part 11 to perform operation control of the air conditioner besides the abnormality log | history 14 mentioned later.

  The abnormality history 14 is a history of information relating to abnormality in discharging the drain water W1 by the drain pump 3 among abnormalities that may occur in the air conditioner. The drainage abnormality of the drain water W1 is caused by, for example, clogging of the drainage path (including the inside of the drain pump 3 and the inside of the drain pipe 4), and the water level detected by the water level sensor 5 has reached a predetermined upper limit water level. In this case, or when the drain pump 3 does not operate even if an operation start signal is transmitted to the drain pump 3, the occurrence of the abnormality is detected.

  As the abnormality history 14, for example, an elapsed time from when the air conditioner stops the previous cooling operation and dehumidifying operation until a drainage abnormality occurs (sometimes referred to as “elapsed time from the shutdown”), It includes information such as the temperature detected by the temperature detection means when it occurred and the humidity detected by the humidity detection means when a drainage abnormality occurred. The specific contents of the abnormality history 14 are not limited to these.

The control unit 11 is electrically connected to the compressor 21 and the expander 22, the indoor blower 23, and the outdoor blower 24, and controls the operation of each unit based on information detected by the suction temperature sensor 6 and the humidity sensor 7. Control means for controlling and performing air-conditioning operation including cooling operation, dehumidifying operation, and heating operation.
In addition, the control unit 11 discharges the drain water W1 accumulated in the drain pan 2 by operating the drain pump 3 while performing the cooling operation and the dehumidifying operation in the air conditioner.

  Further, when the control unit 11 detects that the drainage abnormality has occurred when the drain pump 3 is operated, the elapsed time from the stop of operation, the temperature detected by the temperature detection means when the drainage abnormality has occurred, the drainage The humidity detected by the humidity detecting means when an abnormality occurs is additionally recorded as an abnormality history 14 in the storage unit 13. In the first embodiment, the control unit 11 and the storage unit 13 constitute an abnormality history recording unit.

  Further, the control unit 11 measures the elapsed time from the operation stop using the time measuring unit 12 during the cooling operation and the dehumidifying operation of the air conditioner, and constantly or intermittently controls the temperature and humidity. measure. And the control part 11 is in the timing determined based on these information and the conditions (henceforth microbial growth conditions) on which the microbe guide | induced from the abnormality log | history 14 is easy to propagate, and the operation | movement of the said air conditioner is stopped. The drain pump 3 is operated.

  The control device 10 can be configured by hardware such as a circuit device that realizes the function, or can be configured by an arithmetic device such as a microcomputer or a CPU, and software executed thereon. it can. Further, the configuration of the control device 10 shown in FIG. 2 conceptually describes the functions, and does not necessarily need to be physically configured as shown in FIG. That is, as long as the functions of these configurations can be realized, specific forms relating to specific device distribution / integration are not limited to those illustrated.

[Operation and action of air conditioner]
Next, the operation and action of the air conditioner according to Embodiment 1 will be described.

(Cooling operation, dehumidifying operation)
During the cooling operation and the dehumidifying operation, the indoor heat exchanger 1 functions as a condenser. Moisture in the air is condensed in the indoor heat exchanger 1 to form water droplets, falls from the indoor heat exchanger 1 into the drain pan 2 and accumulates in the drain pan 2 as drain water W1. The control unit 11 operates the drain pump 3 during the cooling operation and the dehumidifying operation, and discharges the drain water W <b> 1 accumulated in the drain pan 2. The drain pump 3 may be always operated during the cooling operation and the dehumidifying operation, or may be operated only when the water level sensor 5 detects that the drain water W1 has accumulated to some extent.

  The water level sensor 5 detects the water level of the drain water W <b> 1 in the drain pan 2. And the control part 11 judges that drainage abnormality generate | occur | produced, when the drain water W1 in the detected drain pan 2 reaches a predetermined upper limit water level. Even when the operation start signal is transmitted to the drain pump 3 and the drain pump 3 does not operate, the control unit 11 may determine that a drainage abnormality has occurred. When the drainage abnormality occurs, the control unit 11 stops the cooling operation and the dehumidifying operation of the air conditioner, and stores information regarding the drainage abnormality in the storage unit 13 as the abnormality history 14.

(Cooling and dehumidifying operations are stopped)
While the cooling operation and the dehumidifying operation are stopped, the suction temperature sensor 6 detects the temperature of the room air based on the output of the suction temperature sensor 6 constantly or intermittently. The humidity sensor 7 also detects the humidity of the room air based on the output of the humidity sensor 7 constantly or intermittently. Moreover, the control part 11 measures the elapsed time after stopping the air_conditioning | cooling operation and dehumidification operation | movement of an air conditioner using the time measuring part 12. FIG.
Then, the control unit 11 determines whether or not the detected temperature of the indoor air, the humidity, and the time since the operation of the air conditioner is stopped satisfy the condition for the propagation of bacteria, which is a condition for easy propagation of bacteria. When the bacteria propagation condition is satisfied, the drain pump 3 is operated.

Here, most of the drain water W1 in the drain pan 2 is discharged by the action of the drain pump 3 during the cooling operation and the dehumidifying operation, but the shape of the drain pan 2, the performance of the drain pump 3, the structure of the drain pipe 4, etc. Due to this restriction, the drain water W1 remains in the drain pan 2.
In general, bacteria are likely to grow in a temperature environment of 30 to 40 ° C. and molds are 25 to 35 ° C. During the cooling operation and dehumidifying operation, the temperature in the indoor unit is about 15 ° C., so fungi and molds are difficult to propagate. It is thought that fungi and molds propagate in the water W1.

  Therefore, when the air conditioner operation is stopped, the temperature of the room air, the humidity, and the time after stopping the operation of the air conditioner satisfy the fungus breeding conditions, and by operating the drain pump 3, A part of the drain water W1 in the drain pan 2 is pumped up. Thereby, the drain water W1 in the drain pan 2 is stirred, and it can suppress that a slime, a biofilm, etc. generate | occur | produce. The operation of the drain pump 3 during the stop of the air conditioning operation is performed for a period of time that allows the drain water W1 in the drain pan 2 to be agitated to generate a flow. The drain pump 3 may be operated intermittently. When the operation of the drain pump 3 is stopped, part of the water in the drain pump 3 and the drain pipe 4 flows in the direction of the drain pump 3 and returns to the drain pan 2. Accordingly, bacteria and mold that may exist in the drain pump 3 and the drain pipe 4 return to the drain pan 2 through the drain pump 3 together with the water returning to the drain pump 3, and by the momentum of the water, It is carried to a region far from the inlet 31. For this reason, even if slime and biofilm are generated, they are likely to be generated at a position far from the suction port 31 of the drain pump 3, so that the slime and biofilm are sucked into the suction port 31 of the drain pump 3. The possibility can be reduced.

The bacteria propagation condition is calculated based on the abnormality history 14 by the control unit 11.
Hereinafter, specific examples of the bacteria propagation conditions will be described.

(1) Temperature and humidity As described above, temperature and humidity are related to the propagation of fungi and fungi. Therefore, based on the temperature and humidity at the time of occurrence of the discharge abnormality recorded in the abnormality history 14, the temperature condition and the humidity condition at which the drainage abnormality is likely to occur are calculated, and these are set as the bacteria propagation conditions. Then, when the temperature and humidity detected during the shutdown of the air conditioner satisfy the temperature condition and the humidity condition set as the bacteria propagation condition, the drain pump 3 is operated. It should be noted that both temperature and humidity are not used as the bacteria propagation condition, but only one of them may be used.

(2) Elapsed time from shutdown As mentioned above, one of the causes of drainage abnormality is clogging of drainage path due to slime and biofilm generated in drain pan 2 during shutdown, and slime and bio The film is generated and grows with the passage of time after the operation is stopped. When the operation of the drain pump 3 is started after the operation is stopped, slime and biofilm generated and grown during the operation stop can be sucked into the drain pump 3 to cause an abnormality in drainage. For this reason, the time from when the operation of the air conditioner is stopped to when the drainage abnormality occurs can be one of the bacteria propagation conditions. Therefore, the elapsed time from when the cooling operation and the dehumidifying operation are stopped until the drainage abnormality occurs is recorded in the abnormality history 14, and based on this, the elapsed time from the shutdown when the drainage abnormality is likely to occur is calculated. This is the fungus breeding condition. And when the elapsed time after stopping the operation of the air conditioner satisfies the elapsed time from the operation stop set as the bacteria propagation condition, the drain pump 3 is operated.

(3) Combination of humidity, temperature, and elapsed time from operation stop The above (1) and (2) may be combined to provide fungus breeding conditions.
For example, when the temperature condition and the humidity condition are satisfied and the elapsed time from the operation stop is satisfied, it can be determined that the bacteria propagation condition is satisfied.
For example, regarding the temperature condition and the humidity condition, a plurality of temperature conditions and humidity conditions may be set so as to relax the temperature condition and the humidity condition as the elapsed time from the stop of operation becomes longer. More specifically, the relaxed condition is set with respect to the reference temperature condition and humidity condition as the elapsed time from the shutdown is relatively longer. The longer the elapsed time from the shutdown, the higher the possibility that slime and biofilm will be generated. Therefore, the generation of slime and biofilm can be suppressed by the above. In addition, when the elapsed time from the shutdown is relatively short, the possibility of slime and biofilm generation is lower than when it is long, so the temperature and humidity conditions are less By tightening, excessive operation of the drain pump 3 can be refrained.

  In the above description, the abnormality history 14 has been described as including the elapsed time from the stop of operation, temperature, and humidity. However, information that is not related to the bacteria propagation condition may not be included in the abnormality history 14. For example, in the case of (2) above, the temperature and humidity need not be included in the abnormality history 14. In addition, when the drainage abnormality occurs and the abnormality history 14 is updated, the bacteria propagation condition may be updated.

  As described above, the air conditioner of the first embodiment is in a temperature and humidity condition in which bacteria are likely to propagate based on the history information of drainage abnormality and the elapsed time since the operation stop during the stop of the air conditioning operation. A certain bacterial propagation condition was calculated. And, when the temperature and humidity of the indoor air satisfy the bacteria propagation condition while the air conditioning operation is stopped, the drain pump 3 is operated. For this reason, the drain water W1 remaining in the drain pan 2 by the action of the drain pump 3 can be agitated to generate a flow under the condition that the bacteria in operation are likely to propagate. Therefore, generation of slime and biofilm is suppressed by the flow generated in the drain water W1 in the drain pan 2, and it is difficult to cause clogging of the drainage path due to these. Since the generation of slime and biofilm is suppressed, clogging of the drainage path due to these is also suppressed, and it is possible to suppress the deterioration of the comfort of the air conditioning environment due to the abnormal drainage during air conditioning operation. it can.

  In the above description, the temperature detected by the suction temperature sensor 6 for controlling the operation of the refrigeration cycle provided in the vicinity of the suction port of the indoor unit is recorded as the abnormality history 14 and used for the determination of the bacteria propagation condition. By doing in this way, since it is not necessary to provide a temperature detection means separately from the operation control of the refrigeration cycle, the configuration is simple. However, the air temperature in the vicinity of the drain pan 2, which is a place where bacteria and viruses can be generated, is reduced. Other temperature sensors that can be detected may be provided as temperature detection means. Similarly, in addition to the humidity sensor 7, another humidity sensor capable of detecting the humidity near the drain pan 2 may be provided as the humidity detection means.

Embodiment 2. FIG.
In the above-described first embodiment, when the drain pump 3 is stopped after the drain pump 3 is operated while the air-conditioning operation is stopped, the bacteria and mold in the drain pipe 4 cause the momentum of the water to return to the drain pump 3. It has been explained that the generation of slime and biofilm in the vicinity of the suction port 31 of the drain pump 3 that is transported far from the suction port 31 of the drain pump 3 can be suppressed. However, even when slime or biofilm is generated at a location away from the suction port 31 of the drain pump 3, the suction port of the drain pump 3 is transported to the drain water W1 newly accumulated in the drain pan 2 over time. It can approach the vicinity of 31. In the second embodiment, a configuration example considering such a case will be described. In the second embodiment, differences from the first embodiment will be mainly described, and the same components as those in the first embodiment are denoted by the same reference numerals.

[Configuration of air conditioner]
FIG. 3 is a schematic configuration diagram of an indoor unit of the air conditioner according to the second embodiment. FIG. 4 is a diagram illustrating a water inlet and a wall of the drain pump according to the second embodiment.
As shown in FIG. 3, the wall 8 stands up from the bottom surface of the drain pan 2 at a position radially spaced from the outer periphery of the suction port 31 of the drain pump 3. As shown in FIG. 4, the wall 8 has a substantially circular planar shape surrounding the outer peripheral side of the substantially circular suction port 31 in plan view. The planar shape of the wall 8 is not limited to the illustrated one, and can be determined in consideration of the planar shape of the suction port 31 and the shape of the drain pan 2.

  Considering the installation height of the suction port 31 of the drain pump 3 and the water level of the drain water W1 stored in the drain pan 2, the height of the wall 8 can suck the drain water W1 from the suction port 31 of the drain pump 3. It is set to a possible height. The height of the wall 8 is lower than at least the installation height of the suction port 31 of the drain pump 3.

[Operation and action of air conditioner]
Next, the operation and action of the air conditioner according to Embodiment 2 will be described.
The control of operating the drain pump 3 when the detected temperature and humidity of the indoor air satisfy the bacteria propagation condition while the air conditioning operation is stopped is the same as in the first embodiment.
When the drain pump 3 is stopped, a part of the water in the drain pipe 4 proceeds toward the drain pump 3 and returns into the drain pan 2 through the suction port 31 of the drain pump 3. In this process, fungi and mold that may exist in the drain pipe 4 are carried by the water and returned to the drain pan 2, and are carried away from the suction port 31 by the momentum of the water.

  Thereafter, mold or bacteria carried far away can be carried to the vicinity of the drain pump 3 as time elapses, such as cooling operation or dehumidification operation being performed and the drain water W1 being added into the drain pan 2. However, since the wall 8 is provided in the vicinity of the outer peripheral side of the suction port 31, mold and fungi are prevented from being sucked into the suction port 31 by being blocked by the wall 8. For this reason, since the invasion of mold and fungi into the suction port 31 of the drain pump 3 is suppressed and slime and biofilm are hardly generated in the drainage path, clogging of the drainage path due to these foreign substances can be suppressed.

Embodiment 3 FIG.
In the third embodiment, differences from the first embodiment will be mainly described, and the same components as those in the first embodiment are denoted by the same reference numerals.

[Configuration of air conditioner]
FIG. 5 is a schematic configuration diagram of an indoor unit of an air conditioner according to Embodiment 3.
The configuration of the indoor unit shown in FIG. 5 is the same as that shown in FIG. 1 of the first embodiment.

[Operation and action of air conditioner]
Next, the operation and action of the air conditioner according to Embodiment 3 will be described.
In the first embodiment described above, the drain pump 3 is operated when the bacteria propagation condition is satisfied while the air-conditioning operation is stopped. In the third embodiment, the operation of causing the indoor unit to function as an evaporator is performed in conjunction with the operation of the drain pump 3. That is, when operating the drain pump 3 while the air conditioning operation is stopped, the control unit 11 operates the compressor 21, the expander 22, the indoor blower 23, and the outdoor blower 24 to perform the cooling operation or the dehumidifying operation. .

  When the cooling operation or the dehumidifying operation is performed in this way, the condensed water W2 adheres to the indoor heat exchanger 1 functioning as a condenser, and this water is accumulated in the drain pan 2. In addition, in FIG. 5, this condensed water W2 is shown notionally. Thereby, since the drain water W1 in the drain pan 2 is increased, the amount of the drain water W1 discharged from the drain pump 3 also increases. Therefore, even when mold or fungus grows while the air conditioning operation is stopped, the fungus or fungus can be discharged together with the drain water W1, and the generation of slime and biofilm is suppressed and the discharge path is clogged by these foreign substances. Can be suppressed.

  It should be noted that the third embodiment can be combined with the second embodiment, and even in that case, the same effect can be obtained.

  DESCRIPTION OF SYMBOLS 1 Indoor heat exchanger, 2 Drain pan, 3 Drain pump, 4 Drain pipe, 5 Water level sensor, 6 Suction temperature sensor, 7 Humidity sensor, 8 Wall, 10 Control apparatus, 11 Control part, 12 Timekeeping part, 13 Storage part, 14 Abnormal history, 21 compressor, 22 expander, 23 indoor blower, 24 outdoor blower, 31 suction port, 32 discharge port.

Claims (6)

An air conditioner indoor unit having a refrigeration cycle and capable of at least one of a cooling operation and a dehumidifying operation,
A drain pan that collects drain water,
A drain pump for sucking the drain water stored in the drain pan and discharging it to the outside;
At least one of temperature detecting means for detecting the temperature in the vicinity of the indoor unit, humidity detecting means for detecting the humidity in the vicinity of the indoor unit, and time measuring means;
When a drainage abnormality from the drain pan occurs while the cooling operation and the dehumidifying operation are stopped, the detected temperature of the temperature detecting means at that time, the detected humidity of the humidity detecting means, and the time measuring means and error history recording means for recording at least one, as an abnormality log of the time elapsed since the stop of the cooling operation and the dehumidifying operation is measured until the drainage abnormality occurs, its
Control means for controlling the operation of the drain pump,
The control means includes
Based on the abnormality history, the detected temperature, said sensing humidity, and at least with respect to one of the elapsed time, calculates a condition to be used when the water discharge abnormality determining whether prone,
After the abnormality history is calculated is recorded and the condition, when the stopped air-cooling operation and the dehumidifying operation, the detection temperature of the temperature sensing means, sensing the humidity of the humidity detecting means, and said timer means one of the elapsed time from the stop of the cooling operation and the dehumidifying operation is measured by is if the previous meet Kijo matter, room air conditioner, wherein the operating the drain pump Machine. The indoor unit of an air conditioner according to claim 1, further comprising a wall that stands up from a bottom surface of the drain pan and surrounds an outer peripheral side of a suction port of the drain pump. The control means includes
After said calculated error history is recorded and the condition, in the during the stop of the cooling operation and the dehumidifying operation, when the previous Kijo matter is satisfied, in addition to operating the drain pump, the The indoor unit of an air conditioner according to claim 1 or 2, wherein the refrigeration cycle is controlled to perform a cooling operation or the dehumidifying operation. The abnormality history is measured by the detected temperature of the temperature detecting means, the detected humidity of the humidity detecting means, and the time measuring means when the drainage abnormality occurs while the cooling operation and the dehumidifying operation are stopped. includes all elapsed time until the drain abnormality occurs after stop the cooling operation and the dehumidifying operation is,
The control means includes
Since the cooling operation and the dehumidifying operation are stopped, the temperature detected by the temperature detecting means, the detected humidity of the humidity detecting means, and the cooling operation and the dehumidifying operation measured by the timing means are stopped. time, before those which meet the Kijo matter, the indoor unit of an air conditioner according to any one of claims 1 to 3, characterized in that operating the drain pump. The control means includes
The higher the time from the stop of the cooling operation and the dehumidifying operation measured by the timer means is long, the air conditioner according to claim 4, wherein the relieving pre Kijo matter relating to the temperature and the humidity Indoor unit of the machine. Outdoor unit,
An air conditioner comprising the indoor unit according to any one of claims 1 to 5.

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