JP6698221B1 - Air conditioner - Google Patents

Abstract

The air conditioner (100) has a refrigeration cycle (RC) having a compressor (32) and an indoor heat exchanger (64), and water that is attached to and drops on the indoor heat exchanger is temporarily stored as drain water. A drain pan (140), a drain pump (PO) that drains drain water collected in the drain pan to the outside, and a control device (20) that controls the operation of the refrigeration cycle and the drain pump. The control device performs a freezing operation in which the indoor heat exchanger functions as an evaporator and the surface temperature of the indoor heat exchanger is below freezing, and “driving time of drain pump after completion of normal cooling operation <drain after freezing operation The drain pump is driven so as to satisfy the relationship of “pump driving time”.

Description

  The present invention relates to an air conditioner.

  Inside the indoor unit of the air conditioner, there is provided a drain pan for temporarily collecting water that has adhered to the indoor heat exchanger and has dropped. Hereinafter, the water accumulated in the drain pan will be referred to as “drain water”. The drain water is drained to the outside through the pipe, but if the drain water is not drained well, it remains in the drain pan. This may cause an offensive odor or mold. Therefore, some indoor units of air conditioners include a drain pump for forcibly draining drain water to the outside (see, for example, Patent Document 1).

  On the other hand, some air conditioners perform a so-called "freeze cleaning operation". "Freeze-cleaning operation" means that the ice (including frost) is adhered to the surface of the indoor heat exchanger, and then the ice is thawed (melted), and the heat generated by this causes the indoor heat exchange to be used. This is an operation operation in which the fine dust adhering to the vessel is washed away.

JP, 2018-25355, A

  However, in the conventional air conditioner, driving the drain pump in relation to the freeze washing operation has not been considered. Therefore, in the conventional air conditioner, it was unclear what kind of drain pump drive control should be performed to reliably reduce the residual amount of drain water when performing the freeze washing operation.

  The present invention has been made to solve the above-described problems, and a main object of the present invention is to provide an air conditioner that reduces the remaining amount of drain water when a freeze cleaning operation is performed.

To achieve the above object, the present invention is an air conditioner, a compressor that compresses a refrigerant, an indoor heat exchanger, a refrigeration cycle, and water that adheres to the indoor heat exchanger and falls. A drain pan that temporarily collects the drain water as drain water, a drain pump that drains the drain water collected in the drain pan to the outside, and a control device that controls the operation of the refrigeration cycle and the drain pump. Performs a freezing operation in which the indoor heat exchanger functions as an evaporator so that the surface temperature of the indoor heat exchanger is below freezing, and "the driving time of the drain pump after the end of the normal cooling operation <after the freezing operation The drain pump is configured to be driven so as to satisfy the relation "drain pump drive time".
Other means will be described later.

  According to the present invention, it is possible to reduce the remaining amount of drain water when the freeze cleaning operation is performed.

It is a system diagram of the air conditioner which concerns on embodiment. It is a side sectional view of the indoor unit of the air conditioner concerning an embodiment. It is a flow chart which shows operation at the time of freezing washing operation of the air harmony machine concerning an embodiment. It is a time chart which shows operation at the time of freeze washing operation of the air conditioner concerning an embodiment. It is a time chart which shows operation of the 1st modification of an air harmony machine. It is a time chart which shows operation of the 2nd modification of an air harmony machine.

  Hereinafter, an embodiment of the present invention (hereinafter referred to as “the present embodiment”) will be described in detail with reference to the drawings. It should be noted that the drawings are merely schematic illustrations so that the present invention can be fully understood. Therefore, the present invention is not limited to the illustrated examples. Further, in each drawing, common or similar components are designated by the same reference numerals, and duplicated description thereof will be omitted.

[Embodiment]
<Structure of air conditioner>
Hereinafter, the configuration of the air conditioner 100 according to the present embodiment will be described with reference to FIG. 1. FIG. 1 is a system diagram of an air conditioner 100 according to this embodiment.

  As shown in FIG. 1, the air conditioner 100 includes an outdoor unit 30, an indoor unit 60, and a control device 20 that controls these units. The indoor unit 60 sets an operation mode (cooling, heating, dehumidification, ventilation, etc.), indoor air volume (quick wind, strong wind, weak wind, etc.), a target indoor temperature, etc. according to a signal input from the remote controller 90.

(Configuration of control device)
The control device 20 includes hardware as a general computer such as a CPU (Central Processing Unit), a DSP (Digital Signal Processor), a RAM (Random Access Memory), and a ROM (Read Only Memory). , A control program executed by the CPU, various data, and the like are stored. The control device 20 controls each unit of the outdoor unit 30 and the indoor unit 60 based on the control program. The details will be described later.

(Structure of outdoor unit)
The outdoor unit 30 includes a compressor 32, a four-way valve 34, and an outdoor heat exchanger 36. The compressor 32 includes a motor 32a and has a function of compressing the refrigerant flowing in through the four-way valve 34. A suction side temperature sensor 41 that detects the temperature of the refrigerant sucked into the compressor 32 and a suction side pressure sensor 45 that detects the pressure of the refrigerant sucked into the compressor 32 are installed in the pipe a1. .. A discharge side temperature sensor 42 that detects the temperature of the refrigerant discharged from the compressor 32 and a discharge side pressure sensor 46 that detects the pressure of the refrigerant discharged from the compressor 32 are installed in the pipe a2. ing. A compressor temperature sensor 43 that detects the temperature of the compressor 32 is attached to the compressor 32.

  The four-way valve 34 has a function of switching the direction of the refrigerant supplied to the indoor unit 60 depending on whether the indoor heat exchanger 64 of the indoor unit 60 functions as an evaporator or a condenser. When the indoor heat exchanger 64 functions as an evaporator, for example, during cooling operation, the four-way valve 34 is switched to connect the pipes a2 and a3 and the pipes a1 and a6 along the path indicated by the solid line. In this case, the high temperature and high pressure refrigerant discharged from the compressor 32 is cooled by the outdoor heat exchanger 36. The cooled refrigerant is supplied to the indoor unit 60 via the pipe a5.

  Further, when the indoor heat exchanger 64 functions as a condenser, for example, during heating operation, the four-way valve 34 connects the pipes a2 and a6 and the pipes a1 and a3 along the path of the broken line. Can be switched. In this case, the high-temperature and high-pressure refrigerant discharged from the compressor 32 is supplied to the indoor unit 60 via the pipes a2 and a6. The outdoor fan 48 includes a motor 48a and blows air to the outdoor heat exchanger 36.

  The outdoor heat exchanger 36 is a heat exchanger that exchanges heat between the air sent from the outdoor fan 48 and the refrigerant, and is connected to the compressor 32 via the four-way valve 34. The outdoor unit 30 includes an outdoor heat exchanger inlet temperature sensor 51 that detects the temperature of air flowing into the outdoor heat exchanger 36, and an outdoor heat exchanger that detects the temperature of the gas-side refrigerant of the outdoor heat exchanger 36. A refrigerant gas temperature sensor 53 and an outdoor heat exchanger refrigerant liquid temperature sensor 55 for detecting the temperature of the liquid side refrigerant of the outdoor heat exchanger 36 are mounted.

  The power supply unit 54 receives a three-phase AC voltage from the commercial power supply 22. A power measuring unit 58 is connected to the power supply unit 54, and the power consumption of the air conditioner 100 is measured by this. The DC voltage output from the power supply unit 54 is supplied to the motor control unit 56. The motor control unit 56 includes an inverter (not shown), and supplies an AC voltage to the motor 32a of the compressor 32 and the motor 48a of the outdoor fan 48. Further, the motor control unit 56 controls the motors 32a and 48a without sensors, and detects the rotation speeds of the motors 32a and 48a.

(Structure of indoor unit)
The indoor unit 60 includes an indoor expansion valve 62, an indoor heat exchanger 64, an indoor fan 66, a motor control unit 67, and a remote controller communication unit 68 that performs bidirectional communication with a remote controller 90. ing. The indoor fan 66 includes a motor 66a and blows air to the indoor heat exchanger 64. The motor control unit 67 includes an inverter (not shown) and supplies an AC voltage to the motor 66a. Further, the motor control unit 67 controls the motor 66a without a sensor and detects the rotation speed of the motor 66a by this.

  The indoor expansion valve 62 has a function of being inserted between the pipes a5 and a7, adjusting the flow rate of the refrigerant flowing through the pipes a5 and a7, and reducing the pressure of the refrigerant on the secondary side of the indoor expansion valve 62. is doing. The indoor heat exchanger 64 is a heat exchanger that performs heat exchange between the indoor air sent from the indoor fan 66 and the refrigerant, and is connected to the indoor expansion valve 62 via the pipe a7.

Further, the indoor unit 60 includes an indoor heat exchanger inlet air temperature sensor 70, an indoor heat exchanger discharge air temperature sensor 72, an indoor heat exchanger inlet humidity sensor 74, an indoor heat exchanger refrigerant liquid temperature sensor 25, The indoor heat exchanger refrigerant gas temperature sensor 26 is provided.
Here, the indoor heat exchanger inlet air temperature sensor 70 detects the temperature of the air sucked by the indoor fan 66. The indoor heat exchanger discharge air temperature sensor 72 detects the temperature of the air discharged from the indoor heat exchanger 64.

  The indoor heat exchanger inlet humidity sensor 74 detects the humidity of the air sucked by the indoor fan 66. Further, the indoor heat exchanger refrigerant liquid temperature sensor 25 and the indoor heat exchanger refrigerant gas temperature sensor 26 are provided at a connection point between the indoor heat exchanger 64 and the pipe a6, and measure the temperature of the refrigerant flowing through the location. To detect. Thus, the compressor 32, the four-way valve 34, the outdoor heat exchanger 36, the indoor expansion valve 62, the indoor heat exchanger 64, and the pipes a1 to a7 form a refrigeration cycle RC.

<Indoor unit configuration>
Hereinafter, the configuration of the indoor unit 60 will be described with reference to FIG. FIG. 2 is a side sectional view of the indoor unit 60. In the present embodiment, the indoor unit 60 will be described as a ceiling cassette type device. The ceiling cassette type means a structure that is embedded in the ceiling 130 and exposes the lower surface to the air conditioning room. However, the indoor unit 60 may be a device such as a wall-mounted type, a ceiling-embedded type, or a floor-standing type.

  As shown in FIG. 2, the indoor heat exchanger 64 is formed in a plate shape bent into a substantially V shape, and is installed in the central portion of the indoor unit 60. The indoor fan 66 has fins arranged in a substantially cylindrical shape, and is arranged in front of the indoor heat exchanger 64. Below the indoor heat exchanger 64 and the indoor fan 66, a drain pan 140 for receiving the water that has condensed on the surfaces of the indoor heat exchanger 64 and dropped and is temporarily stored is arranged. Hereinafter, the water accumulated in the drain pan 140 will be referred to as “drain water”. The indoor unit 60 is provided with a drain pump PO for forcibly discharging drain water collected in the drain pan 140 to the outside. In the present embodiment, the description will be made assuming that the volume of the drain pan 140 is approximately the same as or slightly smaller than the estimated amount of drain water generated in a short time in the freeze cleaning operation described later.

  Behind the indoor heat exchanger 64, an inclined air filter 142 is provided. The lower surface of the indoor unit 60 is covered with a decorative plate 143. Below the air filter 142, an air suction port 144 formed by slitting the decorative plate 143 is formed. The indoor heat exchanger inlet air temperature sensor 70 is provided between the indoor heat exchanger 64 and the air filter 142.

  An air outlet passage 146 is formed in front of the indoor fan 66. The left/right air flow direction plate 148 is provided in the middle of the air blowing passage 146, and controls the direction of the air flow in the left/right direction (the direction perpendicular to the paper surface). The vertical airflow direction plate 150 is provided at the outlet of the air outlet passage 146, rotates about the fulcrum 150a, and controls the direction of the airflow in the vertical direction. The left/right wind direction plate 148 and the up/down air direction plate 150 are rotationally driven by the control device 20 (see FIG. 1 ). The vertical wind direction plate 150 shown by the solid line in FIG. 2 shows the position in the fully open state.

  When the air conditioner 100 is stopped, the vertical wind direction plate 150 is rotated to the fully closed position 152 shown by the alternate long and short dash line. Further, when executing the cleaning operation described later, the vertical wind direction plate 150 is rotated to the position 156 indicated by the alternate long and short dash line, and then to the cleaning operation position 154. Then, as the opening degree of the vertical airflow direction plate 150 increases, the conduit resistance of the air blowing passage 146 decreases. However, even when the vertical airflow direction plate 150 is closed at the fully closed position 152, a gap FS is formed between the vertical airflow direction plate 150 and the decorative plate 143, and a small amount is provided via the gap FS. Air is designed to flow through.

  In the present embodiment, for example, when the interior of the indoor unit 60 needs to be cleaned, a cleaning lamp (not shown) is provided on the decorative plate 143 to indicate this. Further, a suction panel (not shown) for selectively sucking air in the air-conditioned room is provided between the air suction port 144 and the air filter 142.

<Operation during freeze washing operation of air conditioner>
The air conditioner 100 according to this embodiment can perform a freeze cleaning operation. The "freeze cleaning operation" means that the ice (including frost) is adhered to the surface of the indoor heat exchanger 64, and then the ice is thawed (melted), and the generated water is used to drop the indoor heat. This is an operation operation in which fine dust adhering to the exchanger 64 is flowed off. In the "freeze cleaning operation", a larger amount of drain water is generated in a shorter time than in the normal cooling operation.

  Hereinafter, the operation of the air conditioner 100 during the freeze cleaning operation will be described with reference to FIGS. 3 and 4. FIG. 3 is a flowchart showing the operation of the air conditioner 100 during the freeze cleaning operation. FIG. 4 is a time chart showing the operation of the air conditioner 100 during the freeze cleaning operation.

  In the process of the routine shown in FIG. 3, when the user operates the remote controller 90 to instruct the execution of the freeze-cleaning operation, or when it is time to automatically perform the freeze-cleaning operation, a freeze-operation request is generated, In response to this, the control device 20 executes the control.

As shown in FIG. 3, when the freeze operation request is generated, the freeze cleaning operation process is started.
Then, the control device 20 determines whether the freezing operation is possible (step S105). When it is determined in step S105 that the freezing operation is impossible (in the case of “No”), the freeze cleaning operation is stopped (step S110). On the other hand, when it is determined in step S105 that the freezing operation is possible (in the case of “Yes”), the control device 20 drives the drain pump PO (step S115). Since drain water may be generated at the beginning of the freezing operation, the drain pump PO may be driven at the beginning of the freezing operation.

  Next, the control device 20 starts the freezing operation (step S120), and then stops the freezing operation when a desired time elapses (when sufficient ice adheres to the indoor heat exchanger 64) (step S125). Next, the control device 20 starts the thawing operation for flowing down the dust on the surface of the indoor heat exchanger 64 (step S130), and then, when a desired time has elapsed, stops the drain pump PO (step S135). The drying operation is started (step S140). After that, when the desired time has elapsed, the control device 20 stops the processing of a series of routines (processing of the freeze washing operation). The process of step S135 (process of stopping the drain pump PO) can be deleted or moved after step S140 (process of drying operation) according to the operation.

  FIG. 4 shows an example in which the freeze-cleaning operation is performed by interruption during the normal cooling operation. In the example shown in FIG. 4, the “stop operation (of normal cooling operation)” processing, the “compressor protection” operation, the “blower” operation, and the “freeze cleaning” operation are sequentially performed. In the "freeze cleaning" operation, each processing of "freezing" operation, "thawing" operation, and "drying" operation is performed. In the "drying" operation, each processing of "blowing" operation, "heating" operation, and "radiating" operation is performed.

  Here, the “compressor protection” operation is an operation operation of stopping the drive of the compressor 32 to protect the compressor 32. By stopping the driving of the compressor 32, the lubricating oil floating in the internal space can be dropped toward the oil reservoir (not shown) so that the lubricating oil does not flow out of the compressor 32. . The “blowing” operation is an operation operation in which the indoor fan 66 is driven to blow air on the indoor heat exchanger 64. The “freezing” operation is an operation operation of lowering the temperature of the indoor heat exchanger 64 and adhering ice to the surface of the indoor heat exchanger 64. The “thaw” operation is an operation operation in which the temperature of the indoor heat exchanger 64 is raised and the ice adhering to the surface of the indoor heat exchanger 64 is thawed (melted) to remove the dust on the surface of the indoor heat exchanger 64. . The “drying” operation is an operation operation of drying the surface of the indoor heat exchanger 64. The “heating” operation is an operation operation of raising the temperature of the indoor heat exchanger 64. The “heat dissipation” operation is an operation operation of releasing the heat of the indoor heat exchanger 64 to the surroundings.

In the example shown in FIG. 4, the following processing is performed.
First, the "stop operation" process from the cooling operation is performed from time t0 to time t1.
In addition, the "compressor protection" operation is performed from time t1 to time t2.
Further, the "blower" operation is performed from time t2 to time t3.
In addition, the “freezing” operation is performed from time t3 to time t5.
Further, the "thawing" operation is performed from time t5 to time t6.
Further, the "blower" operation is performed from time t6 to time t7.
Further, the "heating" operation is performed from time t7 to time t8.
In addition, the “heat dissipation” operation is performed from time t8 to time t9.
In addition, the “blower” operation is performed after time t9.
In addition, the "freeze cleaning" operation is performed from time t3 to time t9.
Further, the "drying" operation is performed from time t6 to time t9.

The "operation stop" processing from time t0 to time t1 is in the following state. The indoor fan 66, the outdoor fan 48, and the compressor 32, which have been operating in the cooling operation until time t0, have stopped driving. The vertical wind direction plate 150 is lowered (opened) downward at an arbitrary angle. The suction panel (not shown) is open at any angle. The cleaning lamp (not shown) is on. The drain pump PO is driving.
Hereinafter, regarding each driving operation, constituent elements whose states are changing will be described.

  In the "compressor protection" operation from time t1 to time t2, the indoor fan 66 and the outdoor fan 48 are driven at their desired rotational speeds. The inclination of the vertical wind direction plate 150 is set to the upward angle for freezing only. The drain pump PO is driven from time t1 to time t1a, and is stopped at time t1a. Note that the time t1a is a time between the time t1 and the time t2.

  In the “blowing” operation from time t2 to time t3, the indoor fan 66 continues to be driven. The rotation speed of the indoor fan 66 in the "blowing" operation is faster than the rotation speed in the period from the time t1 to the time t2 (the period during the "compressor protection" operation) (the same applies hereinafter).

  In the “freezing” operation from the time t3 to the time t5, the indoor fan 66 is driven until the time t4, and the driving is stopped at the time t4. The outdoor fan 48 is driven until time t5, and is stopped at time t5. The compressor 32 is driven until time t5 and stopped driving at time t5. The rotation speed of the indoor fan 66 in the "freezing" operation is faster than the rotation speed in the period from the time t1 to the time t2 (the period during the "compressor protection" operation), and the period from the time t2 to the time t3. It is slower than the rotation speed (during the "blower" operation). Further, the rotation speed of the outdoor fan 48 in the “freezing” operation is faster than the rotation speed in the period from the time t1 to the time t3 (the period during the “compressor protection” operation and the “blower” operation).

  In the "defrosting" operation from time t5 to time t6, the driving of the indoor fan 66, the outdoor fan 48, and the compressor 32 is stopped.

  In the "blowing" operation from time t6 to time t7, the indoor fan 66 is driven. The inclination of the vertical wind direction plate 150 is set to a downward angle for freezing.

  In the "heating" operation from time t7 to time t8, the indoor fan 66 is continuously driven, and the driving is stopped at time t8. The outdoor fan 48 is driven until time t8 and is stopped driving at time t8. The rotation speed of the outdoor fan 48 during the "heating" operation is faster than the rotation speed during the period from the time t1 to the time t3 (during the "compressor protection" operation and the "blower" operation), and from the time t3. It is slower than the rotation speed during the period until time t5 (the period during the "freezing" operation).

In the “heat radiation” operation from time t8 to time t9, the driving of the indoor fan 66, the outdoor fan 48, and the compressor 32 is stopped.
In the "blowing" operation after time t9, the indoor fan 66 is driven.

<Main features of the air conditioner>
The air conditioner 100 according to this embodiment has the following features.

  (1) As shown in FIG. 4, the control device 20 causes the indoor heat exchanger 64 to function as an evaporator and performs a freezing operation to bring the surface temperature of the indoor heat exchanger 64 below the freezing point, and then "normal cooling operation ends. The drain pump PO is driven so as to satisfy the following relationship: drive time of drain pump <drive time of drain pump after freezing operation.

  In the example shown in FIG. 4, the “driving pump drive time after the end of the normal cooling operation” is the time from time t1 to time t1a. Further, the "driving pump drive time after the freezing operation" is the time after time t5.

  In the "freeze cleaning operation", a larger amount of drain water is generated in a shorter time than in the normal cooling operation. The air conditioner 100 according to the present embodiment can drain drain water efficiently and reliably to the outside by driving the drain pump PO so as to satisfy the above relationship. Therefore, the air conditioner 100 according to the present embodiment can reliably reduce the remaining amount of drain water when the freeze cleaning operation is performed. The air conditioner 100 according to the present embodiment as described above prevents drain water from overflowing from the drain pan 140, and suppresses generation of offensive odor and mold caused by the drain water remaining in the drain pan 140. it can.

  (2) The control device 20 preferably performs the thawing operation after the freezing operation is finished, and drives the drain pump PO for at least a part of the time during the thawing operation. Accordingly, the air conditioner 100 according to the present embodiment can reduce the remaining amount of drain water when the freeze cleaning operation is performed.

  (3) The control device 20 preferably performs the drying operation after the freezing operation and drives the drain pump PO for at least a part of the time during the thawing operation and the drying operation. As a result, the air conditioner 100 according to the present embodiment can more efficiently reduce the remaining amount of drain water when the freeze cleaning operation is performed.

  (4) The control device 20 preferably drives the drain pump PO while driving the indoor fan 66 in the dry operation.

  Inside the indoor unit 60, while the indoor fan 66 is driven, water generated by the thawing of the ice adhering to the indoor heat exchanger 64 may drop into the drain pan 140, and drain water may collect in the drain pan 140. There is. Therefore, the air conditioner 100 according to the present embodiment drives the drain pump PO while driving the indoor fan 66 in the dry operation. As a result, the air conditioner 100 according to the present embodiment can efficiently and reliably reduce the residual amount of drain water when the freeze cleaning operation is performed.

  (5) Preferably, the control device 20 keeps driving the drain pump PO turned on for at least part of the time during the freezing operation, the thawing operation, and the drying operation.

  The drain pump PO generates a comparatively loud sound when switching the drive on/off. Therefore, the control device 20 of the air conditioner 100 according to the present embodiment keeps the drive of the drain pump PO turned on for at least part of the time during the freezing operation, the thawing operation, and the drying operation. Accordingly, the air conditioner 100 according to the present embodiment can reduce the generation of noise due to the drain pump PO.

  (6) Preferably, the control device 20 stops the drain pump PO after a lapse of a predetermined time after the end of the normal cooling operation, and then continues to stop the drain pump PO until the freezing operation is started. Accordingly, the air conditioner 100 according to the present embodiment can secure the time for stopping the drain pump PO. Therefore, the air conditioner 100 according to the present embodiment can realize reduction in energy consumption correspondingly, that is, energy saving.

  (7) The control device 20 preferably continues to drive the drain pump PO for a certain period of time or more even after the drying operation is completed. In the example shown in FIG. 4, “after the drying operation is completed” means after time t9. The air conditioner 100 according to the present embodiment can discharge almost all drain water remaining in the drain pan 140 to the outside by continuing to drive the drain pump PO for a certain time or more even after the drying operation is completed. Therefore, the air conditioner 100 according to the present embodiment can efficiently and reliably reduce the remaining amount of drain water when the freeze cleaning operation is performed.

  As described above, according to the air conditioner 100 of the present embodiment, it is possible to reduce the remaining amount of drain water when the freeze cleaning operation is performed.

  The present invention is not limited to the above-described embodiment, and various changes and modifications can be made without departing from the spirit of the present invention.

  For example, the above-described embodiment has been described in detail in order to easily understand the gist of the present invention. Therefore, the present invention is not necessarily limited to one including all the components described. Further, in the present invention, it is possible to add another constituent element to a certain constituent element or change some constituent elements to other constituent elements. Further, the present invention can delete some of the constituent elements.

  For example, in the above-described embodiment, the indoor unit 60 has been described as being a ceiling cassette type device. However, the present invention can be applied even if the indoor unit 60 is a device such as a wall-mounted type, a ceiling-embedded type, or a floor-standing type.

  For example, the operation of the air conditioner 100 may be modified as in the first modification shown in FIG. 5 or the second modification shown in FIG. FIG. 5 is a time chart showing the operation of the first modification of the air conditioner 100. FIG. 6 is a time chart showing the operation of the second modified example of the air conditioner 100.

(First modification)
The operation of the first modified example shown in FIG. 5 is an operation when the stop operation by the user is received during the freezing operation. The operation of the first modified example shown in FIG. 5 is different from the operation of the above-described embodiment shown in FIG. 4 in that the indoor fan 66 is stopped by receiving a stop operation.

  As shown in FIG. 5, in the operation of the first modified example, the time from the operation end in the normal cooling operation to the drive start of the drain pump PO (that is, from time t1a when the drain pump PO is stopped to time t3). Time) is T11. On the other hand, the time from the acceptance of the stop operation to the start of driving the drain pump PO (that is, the time from time tA to time tB) is T12. Then, the time T12 is a value larger than the time T11 (that is, a value that satisfies the relationship of “T12>T11”). That is, in the operation of the first modified example, the time from when the stop operation is received when the stop operation is received by the user during the freezing operation until the drive of the drain pump PO is started from the end of the operation in the normal cooling operation. It is longer than the time required to start driving the drain pump PO.

  The operation of the first modified example as described above can secure the time for allowing the lubricating oil drifting in the internal space of the compressor 32 to drop toward the oil reservoir (not shown). As a result, the operation of the first modified example can prevent the lubricating oil drifting in the internal space of the compressor 32 from flowing out of the compressor 32 and reducing the operation efficiency of the refrigeration cycle RC.

(Second modified example)
The operation of the second modified example shown in FIG. 6 is an operation in the case where the drain pan 140 has a size such that drain water generated in the freeze cleaning operation in a short time can be stored without overflowing. is there. The operation of the second modification shown in FIG. 6 is different from the operation of the above-described embodiment shown in FIG. 4 in that the drain pump PO is stopped at least part of the time during the drying operation. ..

  The operation of the second modified example as described above can secure the time for stopping the drain pump PO. Therefore, in the operation of the second modified example, it is possible to realize the reduction of energy consumption, that is, the energy saving. In addition, the operation of the second modification can suppress the generation of noise only for the time when the drain pump PO is stopped.

20 Control Device 22 Commercial Power Supply 25 Indoor Heat Exchanger Refrigerant Liquid Temperature Sensor 26 Indoor Heat Exchanger Refrigerant Gas Temperature Sensor 30 Outdoor Unit 32 Compressor 32a, 48a, 66a Motor 34 Four-way Valve 36 Outdoor Heat Exchanger 41 Suction Side Temperature Sensor 42 Discharge side temperature sensor 43 Compressor temperature sensor 45 Suction side pressure sensor 46 Discharge side pressure sensor 48 Outdoor fan 51 Outdoor heat exchanger inlet temperature sensor 53 Outdoor heat exchanger Refrigerant gas temperature sensor 54 Power supply section 55 Outdoor heat exchanger Refrigerant liquid temperature Sensors 56, 67 Motor control unit 58 Electric power measurement unit 60 Indoor unit 62 Indoor expansion valve 64 Indoor heat exchanger 66 Indoor fan 68 Remote control communication unit 70 Indoor heat exchanger inlet air temperature sensor 72 Indoor heat exchanger exhaust air temperature sensor 74 Indoor heat exchanger inlet humidity sensor 90 Remote control 100 Air conditioner 130 Ceiling 140 Drain pan 142 Air filter 143 Decorative plate 144 Air intake port 146 Air outlet passage 148 Left and right wind direction plate 150 Vertical wind direction plate 150a Support point 152 Full closed position 154 Washing operation position 156 Positions a1, a2, a3, a5, a6, a7 Piping FS Gap PO Drain pump RC Refrigeration cycle

Claims (8)

A refrigeration cycle having a compressor that compresses a refrigerant and an indoor heat exchanger,
A drain pan that temporarily collects the water attached to the indoor heat exchanger and dropped as drain water,
A drain pump for draining the drain water collected in the drain pan to the outside,
A control device that controls the operation of the refrigeration cycle and the drain pump;
The control device is
Performing a freezing operation in which the indoor heat exchanger functions as an evaporator and the surface temperature of the indoor heat exchanger is below freezing,
An air conditioner that drives the drain pump so as to satisfy the relationship of "driving time of the drain pump after completion of normal cooling operation<driving time of drain pump after freezing operation". The air conditioner according to claim 1,
The control device is
After the freezing operation is completed, a thawing operation is executed,
An air conditioner, characterized in that the drain pump is driven for at least a part of the time during the thawing operation. The air conditioner according to claim 2,
The control device is
After the freezing operation is completed, a drying operation is executed,
An air conditioner, wherein the drain pump is driven for at least a part of the time during the thawing operation and the drying operation. The air conditioner according to claim 3,
Equipped with an indoor fan,
The air conditioner, wherein the controller drives the drain pump while driving the indoor fan in the drying operation. The air conditioner according to claim 3,
The air conditioner, wherein the control device keeps driving the drain pump ON for at least a part of the time during the freezing operation, the thawing operation, and the drying operation. The air conditioner according to claim 1,
An air conditioner characterized in that the control device stops the drain pump after a lapse of a predetermined time or more after the normal cooling operation ends, and then continues to stop the drain pump until the freezing operation is started. .. The air conditioner according to claim 4,
The air conditioner, wherein the controller continues to drive the drain pump for a certain period of time or more after the drying operation is completed. The air conditioner according to claim 1,
The time from the acceptance of the stop operation in the case of accepting the stop operation by the user during the freezing operation to the drive start of the drain pump is from the operation end in the normal cooling operation to the drive start of the drain pump. An air conditioner characterized by being longer than time.

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