JP2012184886A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dry condensation on a fan of an indoor fan, while reducing noise.SOLUTION: When an indoor temperature is lower than a target temperature after cooling operation and a compressor 12 is stopped, and a fan rotational number of the indoor fan 4 is a predetermined value or smaller, the fan rotational number of the indoor fan 4 is increased so that the level of noise caused by the increase in fan rotational number of the indoor fan 4 is within a range of the level of noise generated in an indoor unit 101 caused by flow of a refrigerant while the refrigerant flows in the indoor unit 101.

Description

  The present invention relates to an air conditioner.

The air conditioner includes a compressor having a constant rotational speed during operation and a constant-speed air including a fan that designates the fan rotational speed to a predetermined value such as “Hi / Me / Lo”. There is a harmony machine. It is to be noted that the fan rotation speed at Hi is set to, for example, “1200 rpm”, the fan rotation speed at Me, for example, “950 rpm”, and the fan rotation speed at Lo, for example, “700 rpm”.
An air conditioner equipped with a constant speed compressor stops the operation of the compressor when the room temperature reaches the target temperature during the cooling operation. Here, when the blower is operating with the compressor stopped, warm and humid air in the room is taken into the indoor unit. This often causes condensation to adhere to the fan of the blower.

In an air conditioner equipped with this constant speed compressor, when the fan rotation speed of the blower is set to “Lo”, dew condensation on the fan of the blower is likely to grow. This is because the amount of air blown to the dew that adheres to the fan is reduced by the amount of slow rotation, and the dew becomes difficult to dry.
Thus, when the dew condensation adhering to the fan grows, the dew condensation is scattered by the rotation of the fan. For example, when home appliances or the like are placed in an air-conditioned space such as under an indoor unit, the scattered moisture may cause a failure.

  By the way, the air conditioner which suppresses dew condensation of the heat exchanger of an indoor unit after a cooling operation or a dry operation, and prevents that a water | moisture content leaks into an air-conditioned space is proposed (for example, patent document 1). reference). In the technique described in Patent Document 1, after the cooling operation or the dry operation is stopped, the blower (indoor fan) is operated at a high speed for a predetermined period to dry the heat exchanger. And since the technique of patent document 1 operates a fan at high speed for a predetermined period, the dew condensation adhering to a fan can also be dried.

JP 2000-230745 A (see, for example, claim 1 and paragraph [0062] of the specification)

  The technique described in Patent Document 1 is to dry the heat exchanger by operating the blower at a high speed for a predetermined period after the cooling operation or the dry operation is stopped, but measures against suppressing noise generated by operating the blower. There is a risk of discomfort to the user because of not being done.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an air conditioner that dries condensation attached to a fan of an indoor fan while suppressing noise.

  An air conditioner according to the present invention has a refrigeration cycle to which a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger are connected, and the compressor and an outdoor unit provided with at least the outdoor heat exchanger An indoor heat exchanger, an indoor fan for sending indoor air to the indoor heat exchanger, and an indoor unit provided with at least a wind direction changing means for adjusting the blowing direction of the air heat exchanged by the indoor heat exchanger In the air conditioner, when the cooling operation is performed and the room temperature falls below the target temperature and the compressor is stopped, if the fan rotation speed of the indoor fan is below a predetermined value, the noise level due to the increase in the fan rotation speed of the indoor fan is large. Therefore, the fan rotation speed of the indoor fan is increased so as to be within the range of the magnitude of noise generated in the indoor unit due to the flow of the refrigerant in the state where the refrigerant is flowing through the indoor unit. .

  Since the air conditioner according to the present invention controls the fan rotation speed of the indoor fan as described above, it is possible to dry the condensation attached to the fan while suppressing noise.

1 is an overall view of an indoor unit of an air conditioner according to an embodiment of the present invention. It is sectional drawing in the dotted line AA of the indoor unit shown in FIG. An example of the refrigerant circuit structure of the air conditioner which concerns on embodiment of this invention is shown. The fan rotation speed and indoor temperature of the indoor fan when the compressor of the air conditioner according to the embodiment of the present invention is operated or stopped will be described.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an overall view of an indoor unit 101 of an air conditioner 100 according to an embodiment of the present invention. 2A is a cross-sectional view taken along a dotted line AA of the indoor unit 101 shown in FIG. 1, and FIG. 2B is an enlarged view of a region B shown in FIG. FIG. 3 shows an example of the refrigerant circuit configuration of the air conditioner 100 according to the embodiment of the present invention.
In addition, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one.

[Configuration of indoor unit 101]
As shown in FIG. 3, the air conditioner 100 according to the present embodiment includes an indoor unit 101 and an outdoor unit 102. As shown in FIG. 1, the outer unit of the indoor unit 101 is configured by the casing 5 and the panel 19 provided on the front surface of the casing 5. Here, FIG. 1 illustrates an example in which the indoor unit 101 is a wall-mounted type, but a ceiling-embedded type or the like may be used.

As shown in FIGS. 1 and 2, the casing 5 is formed with a suction port 6 for sucking room air into the indoor unit 101 and a blower outlet 3 for supplying conditioned air into the room. The casing 5 is formed with an air passage 5 </ b> A for connecting an indoor fan 4, which will be described later, to the air outlet 3, among air passages, which will be described later, from the inlet 6 to the air outlet 3.
The casing 5 has a wind direction changing means 30 for changing the air direction of the conditioned air blown from the outlet 3, tilting means (not shown) for rotating the upper flap 1, the lower flap 2 and the left and right vanes 8 respectively. An indoor heat exchanger 7 that is arranged in the air passage 5A from the suction port 6 to the blowout port 3 and transmits the heat or cold of the refrigerant to the air to generate conditioned air, and the blowout port 3 that draws air from the suction port 6 And an indoor fan 4 that blows out air.

The suction port 6 is an opening for forcing indoor air into the indoor unit 101 by the indoor fan 4. The suction port 6 is formed as an opening on the upper surface of the casing 5. 1 and 2 show an example in which the suction opening 6 is opened only on the upper surface of the casing 5, it goes without saying that the opening may be formed in the panel 19. Moreover, the shape of this suction inlet 6 is not specifically limited.
The blower outlet 3 is an opening through which the air passes when the air sucked from the suction port 6 and passed through the indoor heat exchanger 7 is supplied into the room. The blower outlet 3 is formed in the panel 19 with an opening. The shape of the air outlet 3 is not particularly limited, but may be, for example, a substantially rectangular shape having the longitudinal direction of the indoor unit 101 as a long side as shown in FIG.

In the air conditioner 100 according to the present embodiment, the wind direction changing means 30 includes an upper flap 1, a lower flap 2, and left and right vanes 8.
The upper flap 1 and the lower flap 2 are rotatably provided at the air outlet 3 and change the upper and lower directions of the conditioned air blown out from the air outlet 3. That is, the upper flap 1 and the lower flap 2 adjust the vertical direction of the conditioned air that is blown out while maintaining a predetermined rotation angle or changing the rotation angle during air conditioning.
The upper flap 1 is rotatably provided on a shaft 1A provided on the upper side of the air outlet 3. Further, the lower flap 2 is rotatably provided on a shaft 2A provided on the lower side of the air outlet 3. Note that the shaft 1 </ b> A and the shaft 2 </ b> A are provided in a direction parallel to the longitudinal direction of the indoor unit 101. The shaft 1A and the shaft 2A are connected to tilting means (not shown). The shaft 1A and the shaft 2A are rotated by the power of the tilting means, whereby the upper flap 1 and the lower flap 2 are rotated.
The shapes of the upper flap 1 and the lower flap 2 are not particularly limited. As shown in FIGS. 1 and 2, for example, a plane having a long side and a short side has a substantially rectangular shape. Good.

The left and right vanes 8 are rotatably provided on the upstream side of the upper flap 1 and the lower flap 2 of the air passage 5 </ b> A connecting the indoor fan 4 to the blower outlet 3, and the right and left of the air direction of the conditioned air blown out from the blower outlet 3. Is to change. That is, the left and right vanes 8 adjust the left and right direction of the conditioned air that is blown out while maintaining a predetermined rotation angle or changing the rotation angle during air conditioning.
The left and right vanes 8 are rotatably provided at one end of a shaft 8A provided on the upper side of the air passage 5A. The shaft 8A is provided so as to be orthogonal to a plane constituting the upper side of the air passage 5A. The shaft 8A is connected to tilting means (not shown). The shaft 8A is rotated by the power of the tilting means, whereby the left and right vanes 8 are rotated.
The shape of the left and right vanes 8 is not particularly limited, but may be, for example, a flat plate shape as shown in FIG.

  The tilting means (not shown) rotates the upper flap 1, the lower flap 2, and the left and right vanes 8. This tilting means may be constituted by, for example, a motor connected to each of the shaft 1A, the shaft 2A, and the shaft 8A.

  The indoor heat exchanger 7 functions as an evaporator during cooling operation to cool air, and functions as a condenser (heat radiator) during heating operation to heat the air. The indoor heat exchanger 7 is disposed on the upstream side of the indoor fan 4 in the air passage 5 </ b> A (a central portion inside the casing 5) from the suction port 6 to the blowout port 3. Moreover, the shape of the indoor heat exchanger 7 is illustrated in which the longitudinal section has a substantially V shape inverted. That is, the shape of the indoor heat exchanger 7 is a shape that surrounds the front surface and the upper surface of the indoor fan 4, but is not particularly limited.

The indoor fan 4 is for sucking room air from the suction port 6 and blowing out conditioned air from the air outlet 3. The indoor fan 4 is an air passage 5 </ b> A from the inlet 6 to the outlet 3, and is disposed on the downstream side of the indoor heat exchanger 7. For example, a cross flow fan may be employed as the indoor fan 4.
As shown in FIG. 4, the indoor fan 4 of the air conditioner 100 according to the present embodiment has a total of three rotations of Hi, Me, and Lo set as the operating fan speed. The magnitude relationship between the rotational speeds of Hi, Me, and Lo is Hi>Me> Lo. Here, it is preferable that the fan rotation speed at Hi is 1200 (rpm), the fan rotation speed at Me is 940 rpm, and the fan rotation speed at Lo is 700 rpm, for example. In the following description, it is assumed that the total number of rotations Hi, Me, and Lo is set as the number of revolutions during operation of the indoor fan 4, but two or more may be set.

[Refrigerant circuit configuration of air conditioner 100]
As shown in FIG. 3, the air conditioner 100 compresses the refrigerant flowing through the refrigerant circuit, the four-way valve 17 that switches the flow path in the refrigerant circuit, stores excess refrigerant, and supplies the refrigerant to the compressor 12. The muffler 18, the outdoor heat exchanger 13 that generates the conditioned air by transmitting the cold or hot heat of the refrigerant to the air, the expansion valve 16 that decompresses and expands the refrigerant, and the hot or cold heat of the refrigerant to the air It has the indoor heat exchanger 7 to produce | generate. And these are connected with refrigerant | coolant piping and comprise the refrigerating cycle.

The outdoor heat exchanger 13 is provided with an outdoor fan 14 that promotes heat exchange between the outside air and the refrigerant, and the indoor heat exchanger 7 is provided with an indoor fan 4 that promotes heat exchange between the indoor air and the refrigerant. is set up.
The indoor unit 101 is provided with a tube temperature thermistor 9 that detects the temperature of the refrigerant flowing through the indoor heat exchanger 7 and a room temperature thermistor 11 that detects the temperature of the room. In FIG. 2, the tube temperature thermistor 9 and the room temperature thermistor 11 are not shown. The outdoor unit 102 is provided with an outdoor temperature thermistor 15 that detects the outdoor temperature.
Further, the control device 31 is configured by a microcomputer or the like, and receives detection results from the tube temperature thermistor 9, the room temperature thermistor (room temperature detecting means) 11, and the outside air temperature thermistor 15, and instructions from the remote controller (remote control device). Based on the ON / OFF of the compressor 12, the fan rotation speed (including ON / OFF) of the indoor fan 4 and the outdoor fan 14, the switching of the four-way valve 17, the opening of the expansion valve 16 are controlled, A dehumidifying operation and a heating operation are performed.

The compressor 12 sucks in the refrigerant, compresses the refrigerant to a high temperature / high pressure state, and conveys the refrigerant to the refrigerant circuit. During the cooling operation, one of the compressors 12 is connected to the outdoor heat exchanger 13 via the four-way valve 17, and the other is connected to the indoor heat exchanger 7 via the four-way valve 17. The compressor 12 of the air conditioner 100 according to the present embodiment has a constant rotation speed during operation. That is, the compressor 12 always operates at a constant rotational speed in the operation state (ON) and stops in the standby state (OFF).
The muffler 18 stores surplus refrigerant due to the difference between the heating operation and the cooling operation, and surplus refrigerant with respect to a transient change in operation. The muffler 18 is connected to the suction side of the compressor 12.
The four-way valve 17 switches the refrigerant flow during the heating operation and the refrigerant flow during the cooling operation. The four-way valve 17 connects the discharge side of the compressor 12 and the indoor heat exchanger 7 and also connects the suction side of the compressor 12 and the outdoor heat exchanger 13 during the heating operation (see broken line arrows in FIG. 3). ). Further, during the cooling operation, the discharge side of the compressor 12 and the outdoor heat exchanger 13 are connected, and the suction side of the compressor 12 and the indoor heat exchanger 7 are connected (see solid arrows in FIG. 2).

The outdoor heat exchanger 13 functions as an evaporator during heating operation, functions as a radiator (gas cooler) during cooling operation, and performs heat exchange between the outside air supplied from the outdoor fan 14 and the refrigerant. . One of the outdoor heat exchangers 13 is connected to the four-way valve 17 and the other is connected to the expansion valve 16. The outdoor heat exchanger 13 may be configured by a plate fin-and-tube heat exchanger that can exchange heat between the refrigerant flowing through the refrigerant pipe and the air passing through the fins, for example.
The expansion valve 16 decompresses and expands the refrigerant flowing through the refrigerant circuit. One of the expansion valves 16 is connected to the outdoor heat exchanger 13 and the other is connected to the indoor heat exchanger 7. The expansion valve 16 may be constituted by a valve whose opening degree can be variably controlled, for example, an electronic expansion valve.
As described above, the indoor heat exchanger 7 functions as an evaporator during the cooling operation, functions as a radiator (gas cooler) during the heating operation, and exchanges heat between the indoor air supplied from the indoor fan 4 and the refrigerant. Is to do. One of the indoor heat exchangers 7 is connected to the four-way valve 17 and the other is connected to the expansion valve 16. The indoor heat exchanger 7 may be configured by, for example, a plate fin and tube heat exchanger that can exchange heat between the refrigerant flowing through the refrigerant pipe and the air passing through the fins.

[Operation of refrigeration cycle of air conditioner 100]
The refrigeration cycle operation of the refrigerant circuit shown in FIG. 3 will be described with reference to FIG.
In FIG. 3, during the cooling operation and the dehumidifying operation, the refrigerant in the refrigerant circuit flows in the direction of the arrow indicated by the solid line, while in the heating operation, the refrigerant in the refrigerant circuit flows in the direction of the arrow indicated by the broken line.

  First, the cooling operation (dehumidifying operation) will be described. At the start of the cooling operation, the connection of the four-way valve 17 is switched so that the refrigerant in the refrigerant circuit flows in the direction indicated by the solid line in FIG. The gaseous refrigerant compressed and discharged by the compressor 12 flows into the outdoor heat exchanger 13 via the four-way valve 17. The gaseous refrigerant that has flowed into the outdoor heat exchanger 13 undergoes heat exchange with the outside air supplied from the outdoor fan 14, condenses, and flows out of the outdoor heat exchanger 13. The refrigerant flowing out of the outdoor heat exchanger 13 flows into the expansion valve 16 and is expanded and depressurized by the expansion valve 16. The decompressed refrigerant flows into the indoor heat exchanger 7, undergoes heat exchange with the indoor air supplied from the indoor fan 4, vaporizes, and flows out of the indoor heat exchanger 7. The gaseous refrigerant flowing out from the indoor heat exchanger 7 is sucked into the compressor 12 via the four-way valve 17 and the muffler 18.

  Next, the heating operation will be described. At the start of the heating operation, the connection of the four-way valve 17 is switched so that the refrigerant in the refrigerant circuit flows in the direction indicated by the broken line shown in FIG. The gaseous refrigerant compressed and discharged by the compressor 12 flows into the indoor heat exchanger 7 via the four-way valve 17. The gaseous refrigerant that has flowed into the indoor heat exchanger 7 is subjected to heat exchange with the indoor air supplied from the indoor fan 4, condensed, and flows out of the indoor heat exchanger 7. The refrigerant flowing out of the indoor heat exchanger 7 flows into the expansion valve 16 and is expanded and decompressed by the expansion valve 16. The decompressed refrigerant flows into the outdoor heat exchanger 13, undergoes heat exchange with the outdoor air supplied from the outdoor fan 14, vaporizes, and flows out from the outdoor heat exchanger 13. The gaseous refrigerant flowing out from the outdoor heat exchanger 13 is sucked into the compressor 12 via the four-way valve 17 and the muffler 18.

[Fan rotational speed of indoor fan 4 during cooling operation]
FIG. 4 explains the fan rotation speed and the room temperature of the indoor fan 4 when the compressor 12 of the air conditioner 100 according to the embodiment of the present invention is operated or stopped. FIG. 4A shows the operating state (ON or OFF) of the compressor 12 during the cooling operation. FIG. 4B shows a change in the number of fan rotations of the indoor fan 4 in the operation state (ON or OFF) of the compressor 12 during the cooling operation. Furthermore, FIG.4 (c) represents the change of the indoor air temperature in the driving | running state (ON or OFF) of the compressor 12 at the time of air_conditionaing | cooling operation. Here, the temperature regulation cut-off temperature in FIG. 4C corresponds to the stop of the compressor 12, and the temperature regulation temperature corresponds to the operation of the compressor 12.
The fan rotation speed of the indoor fan 4 during the cooling operation will be described with reference to FIGS.
During the period T1, period T2, and period T3 in FIG. 4, the air conditioner 100 is performing the cooling operation.

(Period T1)
During the cooling operation in the period T1, the compressor 12 continues to operate until the room temperature reaches the temperature control temperature set by the user using a remote controller (remote control device) or the like. That is, the control device 31 continues the operation of the compressor 12 until the detection result of the room temperature thermistor 11 reaches the temperature regulation cut-off temperature.

(Period T2)
During the cooling operation in the period T2, the compressor 12 stops the operation until the room temperature reaches the temperature adjustment temperature set by the user using a remote controller or the like. That is, the control device 31 stops the operation of the compressor 12 until the detection result of the room temperature thermistor 11 reaches the temperature that includes the temperature adjustment. In the period T2, the indoor fan 4 is operated at any one of Hi, Me, and Lo. Here, as shown in FIG. 4B, when the fan rotation speed of the indoor fan 4 is operating at a predetermined value or less, the rotation speed is increased in order to dry the condensation that has adhered to the indoor fan 4. .
The reason for this is that if the indoor fan 4 is operated at a low Lo rotation speed, the amount of air blown to the condensation attached to the fan is reduced by the amount of the low rotation speed, making it difficult for the condensation to dry. This is because the drying of the fan is promoted by increasing the number.
The predetermined value of the fan rotation speed in the air conditioner 100 according to the present embodiment corresponds to Lo. As a predetermined value of the fan rotation speed, for example, 800 rpm at which condensation on the fan is likely to occur may be employed. The predetermined value is changed according to the installation location of the indoor unit 101 and the type of the indoor fan 4.

  Here, during the cooling operation in the period T2, since the compressor 12 is stopped and the refrigerant does not circulate, there is no refrigerant sound generated from the indoor heat exchanger 7 or the refrigerant pipe in the indoor unit 101. For example, when the noise level of the refrigerant sound during the operation of the compressor 12 is about 1 dBA, the noise of about 1 dBA disappears at the time period T2. In addition, dBA refers to the sound pressure level weighted according to the frequency so as to suit human hearing. Therefore, if the noise level corresponding to the increase in the fan rotation speed of the indoor fan 4 is about 1 dBA or less, the noise level in the period T2 can be suppressed to be equal to or less than the period T1.

In other words, the amount of increase in the fan rotation speed of the indoor fan 4 is the amount of noise caused by the increase in the fan rotation speed of the indoor fan 4, and the refrigerant flows into the indoor unit 101 (indoor heat exchanger 7, refrigerant piping, etc.). If the noise level is within the range of the noise generated in the indoor unit 101 due to the refrigerant flow, the noise level in the period T2 can be suppressed to be equal to or less than the period T1. It can be done.
Note that the upper limit value of the fan rotation speed after the increase is preferably, for example, 1/4 of the difference between Me and Lo. For example, when Me is 940 rpm and Lo is 700 rpm, the upper limit of the increase is 60 rpm from (940−700) ÷ 4. FIG. 4B shows an example in which the rotational speed of 50 rpm is increased when the rotational speed of the indoor fan 4 is Lo. Further, as an upper limit value of the fan speed after the increase, for example, among the set fan speeds, the median value of the maximum speed (Hi) and the minimum speed (Lo) and the minimum speed A value obtained by adding 1/4 of the difference to the minimum rotational speed may be used as the upper limit value.
However, when the user instructs the air volume of the indoor fan 4 from the remote controller during the period T2, the instruction is given priority. When the rotation speed of the indoor fan 4 is Hi or Me, the fan rotation speed of the indoor fan 4 is not changed.

  Furthermore, at the time of the cooling operation in the period T2, the upper flap 1, the lower flap 2, and the left and right vanes 8 are rotated to open the air outlet 3, so that the air volume blown from the indoor fan 4 is changed to the maximum. . Here, when the upper flap 1 and the lower flap 2 are rotated to open the air outlet 3, as shown in FIG. 2B, the upper flap 1 and the lower flap 2 are moved with respect to the opening surface of the air outlet 3. This is to make the angle orthogonal. Moreover, rotating the left and right vanes 8 to open the air outlet 3 means that the left and right vanes 8 are substantially parallel to the side surface of the indoor unit 101. When the upper flap 1, the lower flap 2, and the left and right vanes 8 open the air outlet 3 when the period T1 is shifted to the period T2, the upper flap 1, the lower flap 2, and the left and right vanes 8 are not rotated. It's okay.

  At this time, by opening the air outlet 3, pressure loss due to the upper flap 1, the lower flap 2, and the left and right vanes 8 can be reduced, and the fan of the indoor fan 4 can be dried with high efficiency.

(Period T3)
During the cooling operation in the period T3, similarly to the period T1, the compressor 12 continues the operation until the room temperature reaches the temperature adjustment temperature set by the user using a remote controller or the like. That is, the control device 31 continues the operation of the compressor 12 until the detection result of the room temperature thermistor 11 reaches the temperature regulation cut-off temperature.
Then, when the indoor fan 4 is operating at the Lo + increment during the period T2, the control device 31 operates the indoor fan 4 at the original rotational speed (Lo) set by the user using a remote controller or the like.

[Effects of the air conditioner 100]
In the air conditioner 100 according to the present embodiment, when the indoor fan 4 is set to Lo when the operation of the compressor 12 is stopped during the cooling operation, for example, 1 / of the difference between the rotational speeds of Me and Lo. The rotational speed is increased with 4 as the upper limit. As a result, drying of the condensation attached to the fan of the indoor fan 4 can be promoted as much as the number of rotations of the fan is increased, so that the scattering of moisture into the room is suppressed. Moreover, even if the fan rotation speed of the indoor fan 4 increases, the noise generated when the compressor 12 is operating during the cooling operation can be suppressed to the same level or lower.
Further, the air conditioner 100 according to the present embodiment opens the outlet 3 by rotating the upper flap 1, the lower flap 2, and the left and right vanes 8 when the operation of the compressor 12 is stopped during the cooling operation. The pressure loss due to the upper flap 1, the lower flap 2, and the left and right vanes 8 can be reduced, and the fan of the indoor fan 4 can be dried with high efficiency.

  DESCRIPTION OF SYMBOLS 1 Upper flap, 1A shaft, 2 Lower flap, 2A shaft, 3 Outlet, 4 Indoor fan, 5 Casing, 5 A Air path, 6 Inlet, 7 Indoor heat exchanger, 8 Left and right vane, 8 A shaft, 9 Tube temperature thermistor , 11 Room temperature thermistor (room temperature detection means), 12 Compressor, 13 Outdoor heat exchanger, 14 Outdoor fan, 15 Outdoor temperature thermistor, 16 Expansion valve, 17 Four-way valve, 18 Muffler, 19 Panel, 30 Air direction changing means, 31 Control Apparatus, 100 air conditioner, 101 indoor unit, 102 outdoor unit.

Claims (4)

Having a refrigeration cycle to which a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger are connected;
An outdoor unit provided with at least the compressor and the outdoor heat exchanger;
An indoor unit provided with at least an indoor heat exchanger, an indoor fan for sending indoor air to the indoor heat exchanger, and a wind direction changing means for adjusting a blowing direction of the air heat-exchanged by the indoor heat exchanger;
In the air conditioner connected with
When the cooling operation is performed and the room temperature falls below the target temperature, the compressor stops, and the fan rotation speed of the indoor fan is equal to or less than a predetermined value,
The magnitude of noise due to the increase in the fan rotation speed of the indoor fan falls within the range of the magnitude of noise generated in the indoor unit due to the flow of the refrigerant in a state where the refrigerant is flowing through the indoor unit. As described above, an air conditioner characterized by increasing the fan rotation speed of the indoor fan. The fan speed is set with the median value of the maximum and minimum rotation speeds preset as the fan rotation speed and 1/4 of the difference between the minimum rotation speed and the minimum rotation speed as an upper limit. The air conditioner according to claim 1, wherein the number is increased. The wind direction changing means is
The air conditioner according to claim 1 or 2, wherein the air conditioner is controlled so that an air volume of air blown from the indoor unit is maximized. It has a remote control device that receives instructions to increase or decrease the air volume,
The air conditioner according to any one of claims 1 to 3, wherein when an instruction to increase or decrease an air volume is given through the remote control device, the indoor fan is controlled with priority given to the instruction.

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