JP3235882B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner having a dry operation function.

[0002]

2. Description of the Related Art A cooling operation is performed by dividing an indoor heat exchanger into two, and both indoor heat exchangers function as an evaporator, and one of the indoor heat exchangers functions as an evaporator while the other heat exchanger functions as an evaporator. In some cases, a dry operation is performed by causing a chiller to function as a condenser. That is, in the dry operation, the air cooled and dehumidified by the evaporator is reheated by the condenser, reaches a normal temperature, and is blown into the room.

In an air conditioner having the function of the dry operation, the indoor temperature and indoor humidity are detected, and the operating frequency of the compressor and the number of revolutions of the indoor fan are determined according to the detection result and predetermined operating conditions. There is something to set. FIG. 7 shows an example of operating conditions.

[0004] That is, under the operating conditions of Fig. 7, the operating frequency of the compressor is indicated by a numeral, and the rotation speed of the indoor fan is indicated by the alphabet "L- (= 760 rpm)" and "UL (= 650 rpm)". As Ta approaches the target set temperature Ts, and as the room humidity Ha approaches the target set humidity Hs, the operating frequency and the number of revolutions are reduced.

[0005]

A problem to be solved by the way, whether the cooling operation
Loud refrigerant noise when switching from dry to dry operation
I am worried. In dry operation, it is blown into the room
It is important to control the temperature of the dry air.

[0006] The present invention has been made in view of the above circumstances,
The air conditioner according to claim 1 switches from cooling operation to dry operation.
Loud refrigerant noise during switching can be prevented.
Aim. The air conditioner according to claim 2 is suitable for dry operation.
Adjust the temperature of the dry air blown into the room properly.
With sufficient cooling effect for parts
The purpose is to be able to.

[0007]

According to a first aspect of the present invention, there is provided an air conditioner comprising: a compressor, an outdoor heat exchanger, a first expansion mechanism having a variable throttle amount, a first indoor heat exchanger, and a throttle capable of switching between full opening and full opening. (2) a refrigeration cycle to which an expansion mechanism and a second indoor heat exchanger are connected;
The refrigerant discharged from the compressor is passed through the outdoor heat exchanger, the first expansion mechanism, the first indoor heat exchanger, the second expansion mechanism, and the second indoor heat exchanger, and the first expansion mechanism is throttled. (2) means for fully opening the expansion mechanism to execute a cooling operation, and a refrigerant discharged from the compressor to an outdoor heat exchanger, a first expansion mechanism, and a first expansion mechanism.
Means for flowing through the indoor heat exchanger, the second expansion mechanism, and the second indoor heat exchanger, and for fully opening the first expansion mechanism to narrow the second expansion mechanism to perform a dry operation; Means for temporarily increasing the throttle of the first expansion mechanism before switching to execution of operation. Claim 2
Is connected to a compressor, an outdoor heat exchanger, a first expansion mechanism having a variable throttle amount, a first indoor heat exchanger, a second expansion mechanism capable of switching between a throttle and a fully open state, and a second indoor heat exchanger. a refrigerating cycle, the circulating outdoor air to the outdoor heat exchanger
An outdoor fan that sends cooling air to the components of the air conditioner, and an outdoor heat exchanger, a first expansion mechanism, a first indoor heat exchanger, and a second expansion mechanism that send refrigerant discharged from the compressor.
Means for flowing through the second indoor heat exchanger and squeezing the first expansion mechanism to fully open the second expansion mechanism to execute a cooling operation; and an outdoor heat exchanger for discharging the refrigerant discharged from the compressor to the outdoor heat exchanger. A mechanism for flowing through the mechanism, the first indoor heat exchanger, the second expansion mechanism, and the second indoor heat exchanger, and for fully opening the first expansion mechanism and narrowing the second expansion mechanism to perform a dry operation; and means for varying the temperature of the dry air by controlling the rotating speed of the outdoor fan, an outdoor temperature sensor for detecting outside air temperature, during the drying operation, the detected temperature of the outdoor temperature sensor
If the value is less than the specified value, stop the outdoor fan and allow
If the temperature detected by the outside temperature sensor is higher than a predetermined value,
Means for limiting the minimum number of revolutions of the outdoor fan to a value corresponding to the detected temperature .

[0008]

According to the air conditioner of the first aspect, whether the cooling operation is performed or not.
Before switching to dry operation, the first
The throttle of the expansion mechanism is once increased. The air conditioner according to claim 2.
In the dry operation, the rotation speed of the outdoor fan is controlled.
Dry air temperature varies. However, depending on the outdoor temperature
Therefore, the minimum rotation speed of the outdoor fan is limited.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

[0010] As shown in FIG.
The outdoor heat exchanger 3 is connected via the four-way valve 2. This outdoor heat exchanger 3 is connected to a first indoor heat exchanger 5 via a first electronic expansion valve 4. The first indoor heat exchanger 5 is connected to the second indoor heat exchanger 7 via the second electronic expansion valve 6, and the second indoor heat exchanger 7 is connected to the suction port of the compressor 1 via the four-way valve 2. Connected.

The electronic expansion valves 4 and 6 are pulse motor valves whose opening continuously changes in accordance with the number of input drive pulses. Hereinafter, this pulse motor valve is referred to as P
Abbreviated as MV.

The compressor 1 is a variable capacity compressor, and a drive motor is connected to an inverter circuit 11. The inverter circuit 11 rectifies the voltage of the commercial AC power supply 10, converts the rectified voltage into AC having a frequency corresponding to a command from the control unit 20, and outputs the AC. This output is the driving power of the compressor motor.

An outdoor fan 8 is provided near the outdoor heat exchanger 3. The outdoor fan 8 circulates outside air to the outdoor heat exchanger 3, and a motor 8M is connected to the phase control circuit 12. This phase control circuit 12 is connected to the commercial AC power supply 10.
The phase of the power supply to the motor 8M is controlled in accordance with a command from the control unit 20. By this phase control, the rotation speed of the outdoor fan 8 can be changed.

An indoor fan 9 is provided near the indoor heat exchangers 5 and 7.
Is provided. The indoor fan 9 is connected to the indoor heat exchangers 5 and 7.
The motor 9 </ b> M is connected to the commercial AC power supply 10 via the tap switching circuit 13. The tap switching circuit 13 includes a speed switching tap H (high speed), M
It has (medium speed), L (low speed), L- (very low speed), and UL (ultra low speed), and performs tap switching according to a command from the control unit 20.

The control section 20 is composed of a microcomputer and its peripheral circuits, and controls the entire air conditioner. The control unit 20 includes a remote control type operation device (hereinafter, abbreviated as a remote controller) 21, an indoor temperature sensor 22, an indoor humidity sensor 23, and an outdoor temperature sensor 2.
4, four-way valve 2, PMV4, PMV6, inverter circuit 1
1, a phase control circuit 12 and a tap switching circuit 13 are connected. The control unit 20 includes the following functional units.

[1] The compressor 1 is operated, and the refrigerant discharged from the compressor 1 is supplied to the four-way valve 2, the outdoor heat exchanger 3, the PMV 4,
First indoor heat exchanger 5, PMV6, second indoor heat exchanger 7,
Means for flowing through the four-way valve 2, controlling the throttle of the PMV 4 and fully opening the PMV 6 to execute a cooling operation.

[2] Means for controlling the throttle amount of the PMV 4 according to the difference between the degree of superheat in the indoor heat exchanger 7 and its set value or the difference between the compressor discharge temperature and its set temperature difference during the cooling operation. . Note that temperature sensors for detecting the degree of superheat of the indoor heat exchanger 7 are provided between the indoor heat exchanger 7 and the PMV 6 and between the indoor heat exchanger 7 and the four-way valve 2 (not shown).

[3] The compressor 1 is operated, and the refrigerant discharged from the compressor 1 is supplied to the four-way valve 2, the outdoor heat exchanger 3, the PMV 4,
First indoor heat exchanger 5, PMV6, second indoor heat exchanger 7,
Flow through the four-way valve 2 and fully open PMV4
6. A means for controlling the aperture of 6 and performing a dry operation.

[4] Means for controlling the throttle amount of the PMV 6 according to the difference between the degree of superheat in the indoor heat exchanger 7 and its set value or the difference between the compressor discharge temperature and its set temperature during the dry operation. .

[5] The compressor 1 is operated, and the refrigerant discharged from the compressor 1 is supplied to the four-way valve 2, the second indoor heat exchanger 7, and the PMV.
6, first indoor heat exchanger 5, PMV4, outdoor heat exchanger 3,
Flow through the four-way valve 2 and fully open PMV6 for PMV
Means for controlling the throttle of 4 and performing a heating operation.

[6] Means for controlling the opening of the PMV 4 in accordance with the difference between the degree of superheat in the outdoor heat exchanger 3 and its set value or the difference between the compressor discharge temperature and its set temperature during the heating operation. . In addition, a temperature sensor for detecting the degree of superheat of the outdoor heat exchanger 3 is provided at an intermediate position of the outdoor heat exchanger 3 and between the outdoor heat exchanger 3 and the four-way valve 2 (not shown).

[7] At the time of executing the cooling operation, the operating frequency (inverter of the inverter) of the compressor 1 is determined based on the cooling frequency / rotation speed allocation condition predetermined in the internal memory and the detected room temperature Ta and room humidity Ha. The output frequency of the circuit 11) F and the rotation speed of the indoor fan 9 (tap switching circuit 1)
3 based on the switching of (3).

[8] At the time of executing the dry operation, the operating frequency F and the operating frequency F of the compressor 1 are determined based on the pre-determined internal frequency and rotational frequency allocation conditions in the internal memory and the detected room temperature Ta and room humidity Ha. Means for setting the number of revolutions of the indoor fan 9. [9] The detected indoor temperature Ta when the heating operation is performed
Means for controlling the operating frequency F of the compressor 1 in accordance with [10] Cooling operation according to the setting mode with the remote control 21,
Means to select either dry operation or heating operation. [11] Means for selecting the setting of the cooling / dry mode or the execution of the heating operation according to the area of the room temperature Ta when the automatic mode is set by the remote controller 21.

[12] When the cooling / dry mode is set, the room temperature Ta detected by the room temperature sensor 22 and the room humidity Ha detected by the room humidity sensor 23 and the operation mode selected in advance in the internal memory are selected. Means for selecting execution of a cooling operation or execution of a dry operation from conditions. [13] Means for temporarily increasing the aperture of the PMV 4 before switching from execution of the cooling operation to execution of the dry operation. This is to reduce the refrigerant noise during switching.

[14] Means for controlling the rotation speed N (based on the output of the phase control circuit 12) N of the outdoor fan 9 to vary the temperature of the dry air during the dry operation. This is to adjust the amount of sensible heat and select cold dry, isothermal dry, warm dry.

[15] During dry operation, the outdoor temperature sensor 24
Means for limiting the minimum number of revolutions of the outdoor fan 8 in accordance with the outside air temperature To detected in step (1). This is to ensure ventilation in the outdoor unit in which the outdoor fan 8 is provided, and to suppress a rise in the temperature of the transistor (switching element) of the inverter circuit 11 for driving the compressor. [16] Means for temporarily stopping the outdoor fan 8 when starting the dry operation. This aims at smoothing the flow of the refrigerant in the refrigeration cycle. Next, the operation of the above configuration will be described.

It is assumed that the remote controller 31 has set the automatic mode. In this case, if the room temperature Ta detected by the room temperature sensor 22 is in the higher cooling / drying area, the cooling / dry mode is set.

When the cooling / dry mode is set, the indoor temperature Ta, the indoor humidity Ha detected by the indoor humidity sensor 23, and the operation mode selection condition of FIG. Execution of cooling operation,
Execution of the dry operation or execution of the ventilation operation is selected.

That is, if the room temperature Ta is sufficiently higher than the set temperature Ts on the remote controller 21, the cooling operation is executed, and if the room temperature Ta falls within a predetermined range centered on the set temperature Ts, the dry operation is performed. Is executed and the room temperature T
When a falls below the set temperature Ts and deviates from the predetermined range, the air blowing operation is executed.

In the cooling operation, the operation of the compressor 1 and the four-way valve 2
Inactive (neutral state), throttle of PMV4, PM
Full opening of V6, operation of the outdoor fan 8, and operation of the indoor fan 9 are set.

In this case, the refrigerant is discharged from the compressor 1,
It enters the outdoor heat exchanger 3 through the four-way valve 2. In the outdoor heat exchanger 3, the refrigerant releases heat to the outside air and liquefies. The refrigerant that has passed through the outdoor heat exchanger 3 is decompressed by the PMV 4 so as to be easily vaporized, and enters the first indoor heat exchanger 5. The refrigerant entering the first indoor heat exchanger 5 is a PMV 6 in a fully opened state.
, And also flows into the second indoor heat exchanger 7. In the indoor heat exchangers 5, 7, the refrigerant takes heat from the indoor air and evaporates. The refrigerant having passed through the indoor heat exchangers 5 and 7 returns to the compressor 1 through the four-way valve 2.

In this way, the refrigerant flows in the direction indicated by the solid line arrow in FIG. 1 to form a cooling cycle, and the outdoor heat exchanger 3 functions as a condenser and the indoor heat exchangers 5 and 7 both function as an evaporator, so that the indoor heat exchanger works as an evaporator. Is cooled.

At the time of this cooling operation, the compressor 1 is determined from the predetermined cooling frequency / rotation speed allocation condition shown in FIG. 3 and the detected room temperature Ta and room humidity Ha.
(The output frequency of the inverter circuit 11) F and the rotation speed of the indoor fan 9 (based on the switching of the tap switching circuit 13) are set.

Under the frequency / rotation speed allocation condition shown in FIG.
The upper value is the operating frequency F and the lower value is the letter “L”.
"-" Is a very low speed. The number of rotations of the indoor fan 9 is H (high speed), M (medium speed), L (low speed), L-
(Very low speed) and UL (Ultra low speed). That is, as the room temperature Ta approaches the set temperature Ts, the operating frequency F is reduced, and the cooling capacity is reduced. The rotation speed of the indoor fan 9 is constant at a very low speed. In the dry operation, the operation of the compressor 1, the non-operation of the four-way valve 2, the full opening of the PMV 4, the throttle of the PMV 6, the operation of the outdoor fan 8, and the operation of the indoor fan 9 are set.

In this case, the refrigerant is discharged from the compressor 1,
It passes through the four-way valve 2 and the outdoor heat exchanger 3 and from there through the PMV 4 into the first indoor heat exchanger 5. In the first indoor heat exchanger 5, the refrigerant releases heat to the indoor air and liquefies. The refrigerant that has passed through the first indoor heat exchanger 5 is PM
V6, the pressure is reduced so as to be easily vaporized, and the second indoor heat exchanger 7
to go into. In the second indoor heat exchanger 7, the refrigerant takes heat from indoor air and evaporates. The refrigerant that has passed through the second indoor heat exchanger 7 returns to the compressor 1 through the four-way valve 2.

Thus, the refrigerant flows in the direction indicated by the solid arrow in FIG. 1 to form a dry cycle, and the outdoor heat exchanger 3
, The first indoor heat exchanger 5 also functions as a condenser (reheater), and the second indoor heat exchanger 7 functions as an evaporator.

Accordingly, the indoor air is cooled by the second indoor heat exchanger 7, and the moisture contained in the indoor air becomes a drain and adheres to the second indoor heat exchanger 7. The dry air cooled and dehumidified by the second indoor heat exchanger 7 is warmed by the first indoor heat exchanger 5, which is a reheater, and is blown into the room.

When switching from the cooling operation to the dry operation, the PMV 4 shifts from the throttled state to the fully opened state, and the PMV 6 shifts from the fully opened state to the throttled state. There is a fear that will occur. In order to prevent this, as shown in FIG. 5, the aperture of the PMV 4 is once increased before switching.

Once the throttle of the PMV 4 is increased, the circulation amount of the refrigerant decreases, so that when switching, the PMV 4
Even if the opening degree of 6 changes, the pressure fluctuation caused by the change can be kept small, and the generation of the loud refrigerant noise can be prevented. In this case, instead of the PMV 6, an expansion mechanism with a variable throttle amount consisting of a capillary and an on-off valve may be used.

On the other hand, at the time of the dry operation, the operating frequency F of the compressor 1 and the indoor frequency F of the compressor 1 are obtained from the predetermined conditions for allocating the frequency and the number of revolutions for the drying shown in FIG. The rotation speed of the fan 9 is set.

Under the frequency / rotation speed allocation condition shown in FIG.
The numerical value in the upper part is the operating frequency F, the alphabet of interruption is the number of revolutions, and the operating frequency F is assigned over a wide range around the set temperature Ts and the set humidity Hs. The lower numerical value is the rotation speed N of the outdoor fan 8 (based on the output of the phase control circuit 12).

For example, the difference (Ta-Ts) between the room temperature Ta and the set temperature Ts is 0 deg to 0.5 deg, and the difference (Ha-Hs) between the room humidity Ha and the set humidity Hs is + 5% to + 10%. If it is in the zone (the hatched zone A in the figure), the operating frequency F = 28H
z, the ultra-low speed UL of the indoor fan 8 and the speed N = 200 rpm of the outdoor fan 9 are set. This setting is executed in a cycle of 60 seconds. If the zone after 60 seconds is the same, both the temperature difference condition and the humidity difference condition are changed by one step at a time, and the zone A is shifted to the zone B. After 60 seconds, the zone is determined again.

As described above, the dry-only allocation condition is prepared, and the operating frequency F is allocated over a wide range around the set temperature Ts and the set humidity Hs, thereby lowering the cooling capacity based on the room temperature Ta. Regardless, the necessary and sufficient dehumidifying capacity (latent heat) can be secured. Therefore, the room humidity Ha can be reliably and quickly reached to the set humidity Hs, and the comfort can be improved.

By the way, the number of revolutions N of the outdoor fan 8 is set by the lower numerical value in the allocation condition, which is used to select a cool dry operation, an isothermal dry operation, or a warm dry operation according to the indoor temperature Ta. It is.

When the room temperature Ta is low, the warm dry operation is selected. In this warm dry operation, the outdoor fan 8 is operated at the rotation speed N = 0 rpm or the rotation speed N = 100 rpm. In this case, since the heat radiation of the refrigerant in the outdoor heat exchanger 3 is small (the amount of sensible heat is small), the reheater (the first indoor heat exchanger 5)
The amount of heat applied to the air increases, and the dry air is sufficiently warmed and blown into the room.

If the room temperature Ta is close to the set temperature Ts,
Isothermal dry operation is selected. In this isothermal dry operation, the outdoor fan 8 is operated at a rotation speed N = 150 rpm. In this case, the amount of heat radiated by the reheater (first indoor heat exchanger 5) is reduced by the amount of heat radiated by the refrigerant in the outdoor heat exchanger 3, and the dry air is blown into the room to such an extent that it is warmed to the same temperature as the room temperature Ta. Is done.

When the room temperature Ta is high, the cool dry operation is selected. In this cool dry operation, the outdoor fan 8 is operated at a rotation speed N = 200 rpm to a rotation speed N = 400 rpm. In this case, the amount of heat radiated by the reheater (first indoor heat exchanger 5) is reduced by an amount corresponding to the amount of heat radiated by the refrigerant in the outdoor heat exchanger 3, and the dry air is not warmed much but is cooled indoors. To be blown out. As described above, by controlling the rotation speed N of the outdoor fan 8 to adjust the temperature of the dry air, it is possible to moderate the fluctuation of the indoor temperature, which is comfortable.

However, in the dry operation, as shown in Table 1 below, the minimum rotational speed Nmin of the outdoor fan 8 is limited according to the outside air temperature To detected by the outdoor temperature sensor 24.
This addresses the fact that the ventilation of the outdoor fan 8 also serves as a cooling action for the inverter circuit 11 provided in the same outdoor unit. When the outdoor air temperature To is equal to or lower than 20 ° C., the outdoor fan 8 can be stopped. However, when the outside air temperature To increases, the minimum value of the rotation speed N is limited to 50 rpm or 100 rpm, and a sufficient cooling effect on the transistors of the inverter circuit 11 is secured.

[0049]

[Table 1]

FIG. 6 shows how the temperature of the transistor of the inverter circuit 11 changes depending on the rotation speed of the outdoor fan 8. When the outdoor fan 8 is stopped, the temperature of the transformer rises to a considerably high level. However, during the operation of the outdoor fan 8 (50 rpm), the temperature rise of the transistor is suppressed.

Although the minimum rotation speed Nmin is limited according to the outside air temperature To here, the temperature of the transistor of the inverter circuit 11 may be detected, and the minimum rotation speed Nmin may be limited according to the detected temperature Ttr. Good. This example is shown in Table 2 below.

[0052]

[Table 2]

Further, during the dry operation, both the outdoor heat exchanger 3 and the first indoor heat exchanger 5 function as a condenser, and the capacity of the condenser increases, so that the liquid refrigerant easily accumulates in the condenser at the time of start-up. The tendency is remarkable at a low outside air temperature at which the temperature of the heat exchanger decreases, and there is a concern that the refrigerant does not return to the suction side of the compressor 1 and the start-up of the operation is deteriorated.

Therefore, when the dry operation is started, the operation of the outdoor fan 8 is temporarily stopped. When the operation of the outdoor fan 8 is stopped, accumulation of the liquid refrigerant is prevented, the refrigerant is smoothly returned to the suction side of the compressor 1, and a good start-up of the operation is ensured. The operation stop time of the outdoor fan 8 at the time of the start is selected according to the outside air temperature To as shown in Table 3 below.

[0055]

[Table 3]

The discharge refrigerant temperature Td of the compressor 1 is detected regardless of the outside air temperature To, and the operation of the outdoor fan 8 is stopped until the discharge refrigerant temperature Td exceeds 30 ° C. as shown in Table 4 below. You may make it.

[0057]

[Table 4]

The condenser temperature Tc of the outdoor heat exchanger 3 is detected irrespective of the outside air temperature To and the discharged refrigerant temperature Td, and is maintained until the condenser temperature Tc exceeds 20 ° C. as shown in Table 5 below. The operation of the outdoor fan 8 may be stopped.

[0059]

[Table 5] In this case, instead of PMV4 and PMV6,
An expansion mechanism including a capillary and an on-off valve may be used.

[0060]

As described above, according to the present invention, the contract
The air conditioner of claim 1 switches from cooling operation to dry operation.
Generation of loud refrigerant noise at the time of replacement can be prevented. Claim
The air conditioner 2 blows air into the room during dry operation.
The temperature of the lie air can be adjusted appropriately and
A sufficient cooling effect on the product can be secured.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a refrigeration cycle in one embodiment of the present invention.

FIG. 2 shows a format of an operation mode selection condition in the embodiment.

FIG. 3 is a format of a frequency / rotation speed allocation condition for cooling in the embodiment.

FIG. 4 is a format of a frequency / rotation speed allocation condition for a dry machine in the embodiment.

FIG. 5 is a diagram showing a change in the opening degree of each PMV in the embodiment.

FIG. 6 is a view showing an example of a temperature change of a transistor of the inverter circuit in the embodiment.

FIG. 7 shows a conventional operating condition format.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... 4-way valve, 3 ... Outdoor heat exchanger, 4 ... First
Electronic expansion valve, 5: first indoor heat exchanger, 6: second electronic expansion valve, 7: second indoor heat exchanger, 8: outdoor fan, 9: indoor fan, 20: control unit.

Continued on the front page (72) Inventor Hideaki Suzuki 336 Tatehara, Fuji City, Shizuoka Prefecture Inside the Toshiba Fuji Plant (72) Inventor Hideaki Motobashi 336 Tatehara Field Fuji, Shizuoka Prefecture Toshiba Fuji Plant (72) Person Megumi Komazaki 336 Tatehara, Fuji City, Shizuoka Prefecture Inside the Toshiba Fuji Plant (56) References JP-A-59-29937 (JP, A) JP-A-3-213943 (JP, A) JP-A-3 -241260 (JP, A) JP-A-4-203830 (JP, A) JP-A-5-18630 (JP, A) JP-A-5-332629 (JP, A) (58) Fields investigated (Int. . ^7, DB name) F24F 11/02 102 F24F 11/02

Claims (2)

(57) [Claims] 1. A compressor, an outdoor heat exchanger, a first expansion mechanism having a variable throttle amount, a first indoor heat exchanger, and a throttle and a fully openable switchable.
A second expansion mechanism, and a refrigeration cycle that connects the second indoor heat exchanger, the refrigerant of the outdoor heat exchanger to be discharged from said compressor, a first expansion mechanism, a first indoor heat exchanger, a second expansion mechanism,
Means for performing a cooling operation to fully open the second expansion mechanism squeezing flow and the first expansion mechanism through the second indoor heat exchanger, the refrigerant of the outdoor heat exchanger to be discharged from the compressor, the first expansion The air flows through the mechanism, the first indoor heat exchanger, the second expansion mechanism, and the second indoor heat exchanger, and the first expansion mechanism is fully opened to squeeze the second expansion mechanism to perform a dry operation. An air conditioner comprising: means for executing the cooling operation; and means for temporarily increasing the throttle of the first expansion mechanism prior to the switching from the execution of the cooling operation to the execution of the dry operation. 2. A compressor, an outdoor heat exchanger, a first expansion mechanism having a variable throttle amount, a first indoor heat exchanger, a second expansion mechanism capable of switching between a throttle and a fully open state, and a second indoor heat exchanger. and the refrigeration cycle, the circulating outdoor air to the outdoor heat exchanger DOO
An outdoor fan that sends cooling air to the components of the air conditioner, and an outdoor heat exchanger that supplies refrigerant discharged from the compressor,
The first expansion mechanism, the first indoor heat exchanger, the second expansion mechanism, the second
Means for flowing through the indoor heat exchanger and executing the cooling operation by fully opening the second expansion mechanism by squeezing the first expansion mechanism, and an outdoor heat exchanger, the first expansion mechanism for discharging the refrigerant discharged from the compressor, Means for flowing through the first indoor heat exchanger, the second expansion mechanism, and the second indoor heat exchanger, and for fully opening the first expansion mechanism to narrow the second expansion mechanism to perform a dry operation;
And means for varying the temperature of the dry air by controlling the rotational speed of the outdoor fan, an outdoor temperature sensor for detecting outside air temperature, during the drying operation, the detected temperature of the outdoor temperature sensor is Tokoro
If below a certain value, stop of the outdoor fan is allowed,
If the temperature detected by the outdoor temperature sensor is higher than a predetermined value,
Means for limiting the minimum number of revolutions of the outdoor fan to a value corresponding to the known temperature .