JPH0692848B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention includes a plurality of heat exchange cycles and a plurality of indoor fans provided corresponding to the heat exchange cycles, and a common compressor for each heat exchange cycle. The present invention relates to an air conditioner that is driven by a drive source to air-condition a plurality of rooms.

[Prior Art] Conventionally, as an air conditioner of this type, there is a technology described in Japanese Utility Model Laid-Open No. 183428/1983.

The technology of the publication includes a plurality of refrigeration cycles and a plurality of indoor fans provided corresponding to each of them, and performs air conditioning of a plurality of rooms by driving a compressor of each refrigeration cycle with a common engine, In an air conditioner that controls the air flow rate of each indoor fan according to the air conditioning load of each room, the rotation speed of the engine is controlled by an air flow rate control signal for each indoor fan.

[Problems to be Solved by the Invention] In the above conventional air conditioner, the amount of air blown from each indoor fan is determined by the air conditioning load, and the engine speed is controlled by the air amount control signal. When the engine speed is reduced from high speed rotation to medium speed rotation or low speed rotation when there is an extreme difference between the two, there is a problem that the larger air conditioning load causes insufficient capacity.

On the other hand, looking at the patent publication, in Japanese Utility Model Publication No. 58-183428, one of the two indoor fans is in a high-speed use state,
And, when another one is in a medium-speed use state or a low-speed use state, a technique for setting the engine speed to medium-speed rotation is disclosed. However, with such a setting, the warm-up speed or the cooling speed of the room with a large air-conditioning load becomes slow, and the user who needs the room with a large air-conditioning load may feel uncomfortable.

Further, JP-A-51-121942 and JP-A-51-105144 disclose a technique of controlling a compressor at high speed when at least one chamber has a large load. However, the indoor fan speed having a plurality of speeds provided corresponding to the indoor heat exchanger is not always set to the high speed side, and it is not possible to perform deep control.

Japanese Patent Laid-Open No. 49-73750 discloses a technique for cutting off the transmission of rotational force from a drive source based on the detected value of the pressure on the high pressure side, and Japanese Utility Model Laid-Open No. 58-103685 discloses a low pressure. A technique is disclosed in which the transmission of the rotational force from the drive source is cut off based on the detected value of the side pressure. The technique disclosed in this type of publication has an indoor fan provided in a refrigeration cycle, and an air conditioner that drives a compressor of a refrigeration cycle with an engine detects a high-pressure side pressure or a low-pressure side detection value. The compressor can be stopped by. However, this type of technology is limited to releasing the compressor load due to the occurrence of an abnormal state.

For example, while keeping the engine speed at high speed, controlling only the air flow rate of the indoor fan reduces the air flow rate of the indoor unit on the low load side, and the circulating refrigerant amount is the same as other indoor units. Since the amount of heat actually exchanged is small compared to the heat exchange capacity of the indoor unit, abnormal low pressure occurs during cooling,
In addition, there is a problem that the safety device operates due to abnormally high pressure during heating and the air conditioner stops operating.

Further, when there is an abnormality in one of the plurality of refrigerant circulation circuits, only that system is released and the system of the refrigerant circulation circuit having no abnormality cannot always be normally operated.

Therefore, in order to solve the above-mentioned problems, the present invention always sets the indoor fan speed having a plurality of speeds to the high speed side and copes with the imbalance of the air conditioning load of each indoor unit connected to one drive source. In addition, it is an object of the present invention to provide an air conditioner capable of controlling the operation of an indoor unit of another system by disconnecting it when one system of a plurality of refrigerant circulation circuits is abnormal.

[Means for Solving Problems] An air conditioner according to the present invention includes one drive source that obtains rotational power, a compressor that compresses a refrigerant by the rotational force of the drive source, an indoor heat exchanger, and Whether a plurality of refrigerant circulation circuits having an outdoor heat exchanger, a plurality of indoor fans provided corresponding to the indoor heat exchangers, and even one of the plurality of indoor fans are in high-speed use In the high speed use state, the rotation speed of the drive source is set to a high speed rotation. When not in the high speed use state, it is determined whether even one of the plurality of indoor fans is in the medium speed use state. A determination means for setting the rotation speed of the drive source to a medium speed rotation when in the use state, and a rotation speed of the drive source when not in the medium speed use state, and a refrigerant overload of the plurality of compressors. Pressure detection switch for detecting the pressure of the state, and the drive source And an electromagnetic clutch interposed between the compressor and the compressor to shut off the transmission of the rotational force from the drive source when the refrigerant in the compressor is overloaded.

[Operation] In the present invention, a plurality of compressors are connected to one drive source, the refrigerant is compressed by the rotational force of the drive source, and the refrigerant is circulated in the evaporator and the condenser. At this time, when the refrigerant of the specific compressor becomes overloaded, the state is detected by the high pressure detection switch and the low pressure detection switch or one of the detection switches, and is interposed between the drive source and the compressor. The electromagnetic clutch is turned off.

[Embodiment] FIG. 1 is an overall configuration diagram of an air conditioner according to an embodiment of the present invention, and is a state diagram when the air conditioner is used for heating.

In the figure, a gas engine 1 serves as a drive source for two compressors 13 and 23 for compressing a refrigerant gas. That is, the pulley 10 attached to the output shaft of the gas engine 1 is connected to the pulley 11 attached to the input shaft side of the compressor 13 by a belt. An electromagnetic clutch 12 is provided between the pulley 11 and the input shaft of the compressor 13. Therefore, the rotation of the gas engine 1 is transmitted from the pulley 10 to the pulley 11, and the rotational force of the pulley 11 is transmitted to the compressor 13 via the electromagnetic clutch 12. Similarly, the pulley 20 attached to the output shaft of the gas engine 1 is the pulley 21 attached to the input shaft side of the compressor 23.
The belt is connected to the
The torque is transmitted from 20 to the pulley 21, and the rotational force of the pulley 21 is transmitted to the compressor 23 via the electromagnetic clutch 22.

The refrigerant compressed by the compressor 13 passes from the high pressure side to the condenser 18a of the NO.I indoor unit 18 via the 4-port 2-position switching valve 16.
Is supplied to. The heat quantity of the refrigerant supplied to the condenser 18a of the NO.I indoor unit 18 is discharged indoors by the fan 18b rotated by the motor FM1. The NO.I indoor unit 18 condenser 18
The refrigerant heat-exchanged in a is vaporized in the evaporator 17 via the expansion valve 19 and is input to the low pressure side of the compressor 13 via the 4-port 2-position switching valve 16.

Similarly, the refrigerant compressed by the compressor 23 is supplied from the high pressure side to the condenser 28a of the NO.II indoor unit 28 via the 4-port 2-position switching valve 26. The heat quantity of the refrigerant supplied to the condenser 28a of the NO.II indoor unit 28 is discharged indoors by the fan 28b rotated by the motor FM2. The refrigerant heat-exchanged in the condenser 28a of the NO.II indoor unit 28 is vaporized in the evaporator 27 via the expansion valve 29 and input to the low pressure side of the compressor 23 via the 4-port 2-position switching valve 26. To be done.

In the case of heating, the gas engine 1, the electromagnetic clutches 12 and 22, the compressors 13 and 23, and the evaporators 17 and 27 form an outdoor unit. And, the condenser 18a and the fan 18b are NO.I.
The indoor unit 18 and the condenser 28a and the fan 28b constitute a NO.II indoor unit 28. In the case of cooling, the compressor
Refrigerants 13 and 23 circulate backward, evaporators 17 and 27 function as a condenser, and condensers 18a and 28a function as an evaporator.

The air conditioner of the first embodiment has a control circuit such as the indoor unit control circuit of the air conditioner shown in FIG. 2 and the outdoor unit control circuit of the air conditioner shown in FIG.

In FIG. 2, the microcomputer MPU1 forming the indoor unit control circuit is called a one-chip microcomputer or microprocessor. It is preferable to use the microcomputer MPU1 having an analog-digital converter (AD converter) built therein. The thermistor SEN connected in series with the resistor R1 detects the temperature inside the room as the magnitude of the voltage drop and inputs a digital signal to the microcomputer MPU1 as the output of the analog-digital converter 31. This input is used for temperature control of the NO.I indoor unit 18 and the NO.II indoor unit 28, as well as for displaying the current temperature. The potentiometer VR, which constitutes a remote controller for temperature setting, converts the set temperature into a voltage and outputs a digital signal as an output of the analog-digital converter 32 to the microcomputer MPU1.
To enter.

When the cooling switch SW is in the ON state, "L (low level)" is input to the input port P4 of the microcomputer MPU1. Then, in the off state, "H (high level)" is input by the pull-up resistor R2. This input is used for the NO.I indoor unit 18 and the NO.II indoor unit 2 in addition to the outdoor unit control described later.
Used to display 8 cooling and heating settings.

Transistor Q0 from output port P0 of microcomputer MPU1 via pull-up resistor R9 and base resistor R10.
It is connected to the. The relay RY0 is connected to the collector side of the transistor Q0. Therefore, the output port P0 of the microcomputer MPU1 is "H" and the transistor Q0
When is on, relay RY0 turns its contact ry0 on. Power is supplied to the outdoor unit by turning on contact ry0 of relay RY0.

The output ports P1 to P3 of the microcomputer MPU1 are connected to the transistors Q1 to Q3 via pull-up resistors R3 to R5 and base resistors R6 to R8. Transistors Q1 to Q3
Relays RY1 to RY3 are connected to the collector side of. Therefore, the output port P1 of the microcomputer MPU1 ~
When P3 is “H” and transistors Q1 to Q3 are on, relay
RY1 to RY3 turn on their contacts ry1 to ry3. relay
By turning on the contacts ry1 to ry3 of RY1 to RY3, the indoor unit fan motor FM1 or FM2 rotates at high speed, medium speed, and low speed. A diode connected in parallel with relays RY1 to RY3
D0 to D3 are flywheel diodes.

Further, the state of the cooling switch SW is led from the input port P4, and the output states of the relays RY1 to RY3 are led from the output ports P1 to P3 to the microcomputer MPU2 constituting the outdoor unit controller.

The pull-up resistors R3 to R5, R9 and the base resistor R6
-R8, R10 and transistors Q0-Q3 form a drive circuit for relays RY0-RY3. A concrete circuit example of this type of drive circuit is shown in FIG.

In the figure, the output port P of the microcomputer MPU
Is connected to a pull-up resistor r1, which pulls up the potential at the connection point between the output port P and the base resistor r2. When the input transistor Q01 is off, the state is ensured by the base-emitter resistance r3 on the input transistor Q01 side of the transistor Q01 and the transistor Q02 connected in two stages. The output of the input transistor Q01 is inverted by the resistor r4 to be the output of the output transistor Q02. Turning on / off the transistor Q02 turns on / off the relay connected to the collector side. Therefore, in this circuit, the relay is turned on when the output port is "L", and the relay is turned off when the output port is "H".

The inversion of the output ports “H” and “L” in FIG. 2 and the output port in FIG. 4 is determined by the initial setting of the microcomputer MPU1, and which circuit is selected. Good. To take out the relay actuation signal from this circuit, take it out from the collector side of the transistor Q01.

When controlling with the same output signal as "H" and "L" of the output port of FIG. 2, connect a relay to the collector side of the transistor Q01 or connect the transistor Q01 and the transistor Q02 to the Darlington connection. And it is sufficient.

In FIG. 3A, the microcomputer MPU2 that constitutes the outdoor unit controller is called a one-chip microcomputer or microprocessor.
A relay is connected to the output ports P31 to P37 via a drive circuit.

That is, the output ports P31 to P33 are connected to the relays RYH, RYM, RYL via the drive circuits 31, 32, 33. Relay R
When any one of YH, RYM and RYL is activated, any one of its contacts ryH, ryM and ryL is closed.

As shown in FIG. 3B, when one of the contacts ryH, ryM, ryL is closed, the voltage of a predetermined potentiometer forming the rotation speed setting circuit 41 is output. The voltage output is input to the comparison circuit 42, and the output of the comparison circuit 42 drives the fuel supply actuator 43 of the gas engine 1. The drive amount of the actuator 43 and the rotation speed of the gas engine 1 are
Represented by the output of the rotation speed detector 44, the rotation speed detector 44
Is output to the comparison circuit 42. The rotation speed setting circuit
41, comparison circuit 42, actuator 43, gas engine 1,
The rotation speed detector 44 constitutes a known speed control system of the gas engine 1.

The output ports P34 and P35 are connected to the relays RY10 and RY20 via the drive circuits 34 and 35. When the relays RY10 and RY20 are activated, their contacts ry10 and ry20 are closed. Contact point r
When either y10 or ry20 is closed, the electromagnetic clutch 12 or the electromagnetic clutch 22 is energized, and the rotational force of the gas engine 1 is transmitted to the compressor 13 or the compressor 23. When the electromagnetic clutch 12 or the electromagnetic clutch 22 is not energized,
The torque of the gas engine 1 is blocked from being transmitted to the compressor 13 or the compressor 23.

The output ports P36 and P37 are connected to the relays RY31 and RY32 via the drive circuits 36 and 37. When the relays RY31 and RY32 are activated, their contacts ry31 and ry32 are closed. Contact point r
When y31 is closed, the coils of the switching valve 16 and the switching valve 26 are energized to switch the switching valve 16 and the switching valve 26 to the heating side.
When ry32 is closed, the other coil of the switching valve 16 and the switching valve 26 is energized to switch the switching valve 16 and the switching valve 26 to the cooling side.

Also, a microcomputer that constitutes the control unit for the outdoor unit.
The high pressure detection switch 14 and the low pressure detection switch 15 for the NO.I indoor unit are connected to the input ports P14 and P15 of the MPU2. A high pressure detection switch 24 and a low pressure detection switch 25 for the NO.II indoor unit are connected to the input ports P24 and P25.

Then, the input port P11 to P13 of the microcomputer MPU2, the state of the NO.I indoor unit cooling switch SW,
And input the output status of relays RY1 to Ry3. In addition, from the input ports P20 to P23, the NO.II indoor unit cooling switch S
Input the state of W and the output state of relays RY1 to Ry3.

The air conditioner configured as described above can operate as follows.

FIG. 5 is a flowchart for an indoor unit that controls an air conditioner that is an embodiment of the present invention, and FIGS. 6 and 7 are flowcharts for an outdoor unit that controls an air conditioner that is an embodiment of the present invention. . Here, it is assumed that the NO.I indoor unit 18 or the NO.II indoor unit 28 is driven simultaneously or in tandem. The control is the same for both the NO.I indoor unit 18 and the NO.II indoor unit 28.

[Flowchart for Indoor Unit] First, this control is started at the same time when the power of the NO.I indoor unit 18 or the NO.II indoor unit 28 is turned on.

In step S1, each output port and memory required for controlling this indoor unit are initialized. Relay RY in step S2
The outdoor unit is driven by exciting 0 and supplying power to the outdoor unit. In step S3, the temperature set value TS and the room temperature TR of the remote controller are read. Temperature setting value TS in step S4
The room temperature TR is subtracted from the absolute value T, that is, the magnitude of the difference between the temperature set value TS and the room temperature TR is obtained.

In step S5, it is determined whether the absolute value T obtained by subtracting the indoor temperature TR from the temperature set value TS is equal to or greater than a predetermined fan speed threshold TH.
When it is equal to or more than the threshold value TH, the fan 18b or the fan 28b of the NO.I indoor unit 18 or the NO.II indoor unit 28 is driven at high speed in step S6. When the absolute value T is not equal to or more than the threshold value TH in step S5, it is determined in step S7 whether the absolute value T obtained by subtracting the room temperature TR from the temperature set value TS is less than or equal to a predetermined threshold value TL of the fan speed. When it is less than or equal to the threshold value TL, the fan 18b or the fan 28b of the indoor unit is driven at low speed in step S8. When the absolute value T obtained by subtracting the room temperature TR from the temperature setting value TS in steps S5 and S7 is not greater than or equal to the predetermined threshold TH of the fan speed and less than or equal to the threshold TL, in step S9 the fan 18b or the fan 28b.
Drive at medium speed.

As described above, in the NO.I indoor unit 18 or the NO.II indoor unit 28, the speed of the fan 18b or the fan 28b is mainly adjusted.

[Flowchart for outdoor unit] In step S21, each output port and memory required for controlling this outdoor unit are initialized. NO in step S22
After the indoor unit 18 or the NO.II indoor unit 28 is driven, it stands by for a predetermined time, during which the gas engine is driven, and further,
The predetermined waiting time is set to a time until the NO.I indoor unit 18 or the NO.II indoor unit 28 enters a substantially stable state. NO.I
When the indoor unit 18 or the NO.II indoor unit 28 enters a substantially stable state, the speed of the fan 18b or the fan 28b of the NO.I indoor unit 18 or the NO.II indoor unit 28 and the state of the cooling switch SW are changed in step S23. Read. At this time, the driven NO.I
In the indoor unit 18 or the NO.II indoor unit 28, the pull-up resistor R2 of the microcomputer MPU1 that constitutes the indoor unit controller is used.
Allows the input port of the microcomputer MPU2 that constitutes the outdoor unit controller when the cooling switch SW is in the off state.
"H" is input to P10 or P20, and "L" is input to the input port P10 or P20 when the cooling switch SW is on. The selection speed of the fan 18b or the fan 28b is determined by the pull-up resistors R3 to R5 when the output port P1 to P3 of the microcomputer MPU1 is "H" and the input port P11 to P13 or P21 to the microcomputer MPU2. "H" in any of P23, output port P1 of microcomputer MPU1
When ~ P3 is "L", "L" is input to the input ports P11 to P13 or P21 to P23 of the microcomputer MPU2.

When the state of the cooling switch SW of the NO.I indoor unit 18 or the NO.II indoor unit 28 is ON in step S24, one coil of the switching valve is excited to drive to the cooling side in step S25, and the cooling switch SW If the state is not on, the other coil of the switching valve is excited and driven to the heating side in step S26. Then, in step S27, it is determined whether even one of the fan 18b or the fan 28b is in the high speed use state, and when it is in the high speed use state,
In step S28, the relay RYH is energized via the drive circuit 31, its contact ryH is closed, and the gas engine 1 is set to high speed rotation. Also, in step S29, fan 18b or fan
Even if one of 28b is not in the high speed use state and in the medium speed use state, when it is in the medium speed use state, the relay RYM is energized via the drive circuit 32 in step S30, and its contact point Close ryM and set gas engine 1 to medium speed rotation. Then, in step S29, fan 18b or fan
Even if one of 28b is not in the high speed use state and in the medium speed use state, when it is not in the medium speed use state, in step S31, the relay RYL is energized via the drive circuit 33,
The contact ryL is closed and the gas engine 1 is set to low speed rotation.

When the speed of the fan 18b of the NO.I indoor unit 18 is not set in step S32 and "L" is input to all the input ports P11 to P13 of the microcomputer MPU2, step S35
Then, the electromagnetic clutch 12 of the NO.I indoor unit 18 is de-energized, and the transmission of the rotational force of the gas engine 1 to the compressor 13 is shut off. Then, in step S33, the high pressure detection switch 14 of the NO.I indoor unit 18 is in the ON state, or in step S34 N
It is determined whether the low pressure detection switch 15 of the OI indoor unit 18 is in the ON state, and the high pressure detection switch 14 and the low pressure detection switch 15
Is not on, the electromagnetic clutch 12 of the NO.I indoor unit 18 is energized in step S36, and the rotational force of the gas engine 1 is input to the compressor 13. When the high voltage detection switch 14 or the low voltage detection switch 15 is in the ON state, NO in step S35.
The electromagnetic clutch 12 of the indoor unit 18 is de-energized, and the rotational force of the gas engine 1 is cut off from being transmitted to the compressor 13.

Similarly, when the speed of the fan 28b of the NO.II indoor unit 28 is not set in step S37 and "L" is input to all the input ports P21 to P23 of the microcomputer MPU2, NO. II The electromagnetic clutch 22 of the indoor unit 28 is de-energized to cut off the transmission of the rotational force of the gas engine 1 to the compressor 23. Then, in step S38, it is determined whether the high pressure detection switch 24 of the NO.II indoor unit 28 is in the ON state, or in step S39 whether the low pressure detection switch 25 of the NO.II indoor unit 28 is in the ON state, and the high pressure detection switch When the low voltage detection switch 24 and the low voltage detection switch 25 are not in the ON state, NO.II is selected in step S41.
The electromagnetic clutch 22 of the indoor unit 28 is energized, and the rotational force of the gas engine 1 is input to the compressor 23. High voltage detection switch
24 or the low-pressure detection switch 25 is in the ON state, the electromagnetic clutch 22 of the NO.II indoor unit 28 is de-energized in step S40, and the transmission of the rotational force of the gas engine 1 to the compressor 23 is interrupted. To do.

In the control of the NO.I indoor unit 18 and the NO.II indoor unit 28, in particular, the refrigerant of the compressor 13 or 23 that occurs when the load of the NO.I indoor unit 18 and the NO.II indoor unit 28 is unbalanced. Overload condition, for example, when the fan 18b of the NO.I indoor unit 18 is
When the fan 28b of the O.II indoor unit 28 is set to medium speed or low speed, due to the capacity of the fan 28b of the NO.II indoor unit 28, the refrigerant on the compressor 23 side becomes overloaded and the In this case, the pressure on the output side of the refrigerant on the compressor 23 side becomes abnormally high. Further, in the case of cooling, the pressure on the input side of the refrigerant on the compressor 23 side becomes abnormally low.

However, in the present embodiment, whether the high pressure detection switch 14 of the NO.I indoor unit 18 is in the ON state in step S33, or step S34
At NO.I indoor unit 18, it is determined whether the low-pressure detection switch 15 of the indoor unit 18 is in the ON state, and at step S38, the high-speed detection switch 24 of the NO.II indoor unit 28 is in the ON state, or at step S39, NO.
II It is determined whether the low pressure detection switch 25 of the indoor unit 28 is in the ON state, and when the refrigerant pressure of the compressor 13 or 23 becomes abnormal, the corresponding NO.I electromagnetic clutch 12 or N of the indoor unit 18
The electromagnetic clutch 22 of the O.II indoor unit 28 is de-energized to block the rotational force of the gas engine 1 from inputting to the compressor 13 or the compressor 23.

Therefore, the compressor 13 or 23 during heating and cooling
The abnormal pressure of the refrigerant can be used without stopping the gas engine 1. At this time, in the above-described embodiment, two indoor units have been described, but the same applies when more than two indoor units are connected.

The judgment made in step S22 when the NO.I indoor unit 18 or the NO.II indoor unit 28 has entered a substantially stable state is the NO.I indoor unit.
18 or NO.II indoor unit 28 side may be performed. The determination of the stable state of the NO.I indoor unit 18 or the NO.II indoor unit 28 by the control on the outdoor unit side is once performed by the NO.I indoor unit 18 or
Even if the NO.I indoor unit 18 or the other of the NO.II indoor unit 28 is later added as a load to the gas engine 1 driven by one of the NO.II indoor units 28, the high-speed control of the gas engine 1 is not possible. Since it has no significant impact, N was immediately introduced later.
The OI indoor unit 18 or the NO.II indoor unit 28 is driven.

Further, the electromagnetic clutch 12 or 22 used in this embodiment,
When the present invention is carried out, the clutch is not limited to an electromagnetic clutch, but may be any clutch that can be electrically controlled as necessary, and its structure is not limited to any particular one. An integrated one can also be used.

Also for the gas engine of the drive source used in this embodiment, an electric motor or the like can be used when the present invention is carried out.

Further, the pressure detection switch used in the present embodiment may be a low pressure detection switch or a high pressure detection switch when used as a cooling only machine or a heating only machine.

[Advantages of the Invention] As described above, the air conditioner of the present invention can obtain a turning force
A plurality of refrigerant circulation circuits having a compressor for compressing the refrigerant by the rotational force of the drive source of the stand, an indoor heat exchanger and an outdoor heat exchanger, and a plurality of refrigerant circulation circuits provided corresponding to the indoor heat exchangers, respectively. Even if one of the indoor fans is in a high-speed use state or a medium-speed use state, the rotation speed of the drive source is set to a high-speed rotation in the high-speed use state, and in the medium-speed use state. Set the rotation speed of the drive source to medium speed rotation,
When not in the medium speed use state, a determination unit that sets the rotation speed of the drive source to a low speed rotation, a pressure detection switch that detects the pressure of the refrigerant of the plurality of compressors in an overloaded state, the drive source and the compressor. And an electrically controllable electromagnetic clutch that is interposed between the two to shut off the transmission of the rotational force from the drive source when the refrigerant in the compressor is overloaded.

Therefore, it is determined whether or not even one of the plurality of indoor fans provided corresponding to the indoor heat exchanger is in the high speed use state, and in the high speed use state, the rotation speed of the drive source is set to the high speed rotation. When it is not in the high speed use state, it is determined whether even one of the plurality of indoor fans is in the medium speed use state, and in the medium speed use state, the rotation speed of the drive source is set to the medium speed rotation, Since the rotation speed of the drive source is set to a low speed rotation when not in use, when the refrigerant of the compressor is in an overload state, a pressure detection switch for detecting the pressure in the overload state, The overloaded compressor can be cut off by the electrically controllable clutch, and the indoor unit can be controlled according to the air conditioning load of each indoor unit. Further, if there is an abnormality in one of the plurality of refrigerant circulation circuits, only that system can be released by the electromagnetic clutch, so that the refrigerant circulation circuit system having no abnormality can always be normally operated.

In addition, it is determined whether even one of the indoor fans is in a high-speed use state, and the rotation speed of the drive source is set according to the room with a high rotation speed of the indoor fan, that is, the room with a large air conditioning load. For example, when the air-conditioning loads of the two rooms are different, it is possible to rapidly heat or cool the room having a large air-conditioning load, and it is possible to provide the user who needs the room having a large air-conditioning load with a comfortable feeling. Further, in a room with a low air conditioning load, it is possible to repeatedly operate or stop the air conditioner, and it is possible to give a feeling of comfort to the user who needs it in a room with a low air conditioning load.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an air conditioner of an embodiment of the present invention, FIG. 2 is a control circuit diagram of an indoor unit of the air conditioner of the embodiment, and FIG. 3 is an air conditioner of the embodiment. 4 is a control circuit diagram for the outdoor unit of FIG.
FIG. 5 is an indoor unit flowchart for controlling the air conditioner according to the embodiment of the present invention, and FIGS. 6 and 7 are outdoor unit flowcharts for controlling the air conditioner according to the embodiment of the present invention. In the figure, 1 ... Gas engine 13,23 ...... Compressor 16,26 …… 4-port 2-position switching valve 17,27 …… Evaporator 18a, 28a …… Condenser 18b, 28b …… Fan 18 …… NO .I indoor unit 28 …… NO.II indoor unit. In the drawings, the same reference numerals and symbols indicate the same or corresponding parts.

Claims (2)

[Claims] 1. A plurality of refrigerant circulation circuits having one drive source for obtaining rotational power, a compressor for compressing a refrigerant by a rotational force of the drive source, an indoor heat exchanger and an outdoor heat exchanger, A plurality of indoor fans provided respectively corresponding to the indoor heat exchangers, and even one of the plurality of indoor fans determines whether or not the indoor heat exchanger is in a high-speed use state. The rotation speed is set to high speed, and when not in the high speed use state, it is determined whether even one of the plurality of indoor fans is in the medium speed use state, and in the medium speed use state, the rotation speed of the drive source is set to the medium speed. When the rotation speed is set and the medium speed is not in use, the determination unit that sets the rotation speed of the drive source to the low speed rotation, the pressure detection switch that detects the pressure of the refrigerant of the plurality of compressors in the overloaded state, and the drive Interposed between the source and the compressor, During an overload state of the refrigerant, the air conditioner characterized by comprising an electromagnetic clutch for a cut-off state transmission of the rotational force from the driving source. 2. The air conditioner according to claim 1, wherein the pressure detection switch is a high pressure detection switch and a low pressure detection switch.