JP3157381B2 - 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 for performing indoor air conditioning, and more particularly to an air conditioner for draining drain water from an indoor unit to the outside through a drain using a drain pump.

[0002]

2. Description of the Related Art Buildings such as independent houses and condominiums are provided with electric wiring generally called a single-phase three-wire system. This single-phase three-wire electrical wiring is composed of a neutral wire and two 100 V wires, and one of the 100 V wires and the neutral wire supplies single-phase 100 V AC power, and two 100 V wires. Single-phase 200 V AC power can be selectively obtained.

The above-mentioned electric wiring is entrusted to a contractor other than a contractor, and the contractor refers to home appliances, for example, air conditioners, installed in the building with reference to drawings, materials, etc. given by the contractor. Wiring is performed so that the AC power required for the machine can be supplied to the outlet near the indoor unit installation position.

[0004]

However, there are air conditioners of the AC100V and AC200V types depending on their capabilities, including single and multi-type air conditioners. Accordingly, either one of the AC power is supplied.

A drain pump corresponding to this AC power, that is, a drain pump for AC100V, AC20
It was necessary to select and mount a drain pump for 0 V, respectively.

However, AC100V, AC200
The wiring work of V is generally performed by an electric contractor,
When the installation company of the air conditioner was different, the wiring work was not completed at the time of installation of the air conditioner in some cases.

[0007] In particular, the wiring work of AC100V is performed earlier, but the wiring work of AC200V tends to be delayed.
In the case of the 200 V specification, there was a problem that the operation of the drain pump could not be confirmed until 200 V AC was supplied.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent a problem in the drain pump even when the commercial AC power supply for an air conditioner is either AC100V or AC200V. AC20
It is an object of the present invention to provide an air conditioner capable of confirming the operation of a drain pump even when there is no power supply of 0V.

[0009]

SUMMARY OF THE INVENTION The present invention regulates indoor air.
The indoor side unit for temperature, De exiting from the indoor side unit
A drain pump that discharges drain water to the outside, and two sets of stator windings provided in parallel ,
Drain pump motor to be driven
Motor drive for outputting electric power to the drain pump motor
Circuit in an air conditioner with a motor drive circuit
To Luo motor drain pump is switched from the power source as connected to the supply of the stator windings of the two systems are arranged in parallel or in series in accordance with the voltage of the power supplied to the air conditioner
Power is output and the drain pump motor is
A pair of connectors for supplying electric power output from the motor drive circuit to the two stator windings of the drain pump motor
And a drain pump side connector of the pair of connectors is provided with a power supplied from a power supply in parallel with the two stator windings so as to be directly connected from the power supply.
In which the second connector connectable terminals are formed with wiring to supply the contact.

[0010]

In the air conditioner configured as described above, the air conditioner
According to the power supply voltage supplied to the sum machine, AC100V Noto
From the motor drive circuit to the drain pump motor.
For the power supply of the two stator windings of the motor for the ren pump
Connection is parallel, and when AC200V is also
Power is output and the power supply voltage is AC
Drain for both 200V and 100V AC
The pump can be driven .

Further, an AC200V specification air conditioner
At the time of installation, AC200V power supply construction was not completed and AC1
When there is only a power supply of 00 V, the stator of the drain pump is wound from the power supply of AC 100 V using the second connector .
Supply power directly to the line to check the operation of the drain pump .
That it is what it is.

[0012]

1 to 10 show an example in which the present invention is applied to a separate type air conditioner comprising an indoor unit and an outdoor unit. This air conditioner uses an indoor heat exchanger mounted on the indoor unit and an outdoor heat exchanger mounted on the outdoor unit, a compressor, pressure reducing means (electric expansion valve, capillary tube, etc.), a four-way valve, a solenoid valve, etc. A refrigerant circuit of a heat pump type is configured by connecting with a pipe, and a cooling operation, a heating operation, and a dehumidification operation can be appropriately performed by switching a four-way valve and / or a solenoid valve.

First, an electric circuit of the indoor unit will be described with reference to FIG. In the figure, 1 is a plug that can be inserted into an air conditioner outlet, F is a fuse, 2 is a rectifier circuit that rectifies AC power input through the plug 1, 3
Is a DC brushless motor for driving a cross-flow fan for blowing temperature-controlled air, and 4 is a DC voltage applied to the brushless motor 3 based on a control signal from the microcomputer 5.
A motor power supply circuit (switching power supply circuit) for changing the voltage in the range of 0 to 36 V, 6 is a motor drive circuit for switching energization to each winding of the brushless motor 3 based on a control signal from the microcomputer 5, and 7 is a microcomputer 5 It is a control power supply circuit that generates a control DC power (5 V) used for the above-described operations.

The microcomputer 5 stores a program for controlling the operation of each device according to the operation mode, a ROM for storing an input voltage determination program and a determination table which will be described in detail later, and stores operation data and control data. RAM
And a CPU for executing a program are housed in the same package. Note that a part of the above programs, tables, and data may be stored in an external ROM and connected to the microcomputer 5.

Reference numeral 8 denotes a switch board having an ON / OFF switch, a test operation switch, and the like. 9 denotes a remote control signal (ON / OFF signal, operation mode switching signal, room temperature setting signal, air volume setting signal, etc.) from the wireless remote controller 10. , A driving lamp 11a comprising an LED,
The display panel includes a cooling lamp, a heating lamp, a dehumidification lamp, and the like.

A room temperature sensor 12 for detecting a room temperature;
Reference numeral 13 denotes a heat exchanger temperature sensor for detecting the temperature of the indoor heat exchanger, and reference numeral 14 denotes a humidity sensor for detecting the humidity in the room. . Reference numeral 15 denotes a step motor for driving a flap for varying the direction of temperature-controlled air blowing, and its rotation angle is controlled by a control signal (pulse train) from the microcomputer 5.

Reference numeral 16 denotes a heater for auxiliary heating which is energized during a defrosting operation or the like, reference numeral 17 denotes a relay, and reference numeral 18 denotes a triac for the heater. Reference numeral 19 denotes a driver, which controls the relay 17 and the triac 18 based on a control signal from the microcomputer 5 to enable the microcomputer 5 to control the amount of heat generated.

Reference numeral 20 denotes a serial converter for converting control data (frequency of AC power supplied to the compressor motor, four-way valve switching signal, etc.) from the microcomputer 5 into a serial signal, or converting a serial signal transmitted from the outdoor unit. Circuit. 21 and 22 are power terminals for transmitting AC power input through the plug 1 to the outdoor unit, and 23 is a communication terminal for performing serial communication between the two units.

Reference numeral 24 indicates the voltage of the AC power input through the plug 1 and detects the voltage value (AC 100 V or AC 200 V).
V) is an input voltage detection circuit (see FIG. 2) that outputs a detection signal according to V) to the microcomputer 5.

Reference numeral 25 denotes a drain pump motor for discharging drain water, which is provided with two sets of stator windings 25a and 25b which are wound twice in parallel in slots of the stator.

Reference numeral 26 denotes a motor drive circuit (electric circuit) provided with a relay and the like, which controls supply of AC power to the motor 25 based on a control signal from the microcomputer 5, and
Based on a signal from the input voltage detection circuit 24, the motor 25
The connection between the stator windings 25a and 25b is switched between series when the AC voltage is 200V and parallel when the AC voltage is 100V.

The input voltage detection circuit 24 has a circuit configuration as shown in FIG. In the figure, I1 and I
2 is an AC power input terminal, I3 is a latch signal input terminal, O1 is a detection signal output terminal, O2 is a coil switching signal output terminal, Q1 is a PNP transistor, and Q2 to Q4.
Is an NPN transistor, R1 to R12 are resistors, C1
C3 is a capacitor, ZD is a Zener diode, PH
C is a photocoupler.

The circuit is supplied with DC power of 5 V from the control power supply circuit 7. As shown in FIG. 3, the input terminals I1 and I2 are connected to the power line, and the input terminal I3 is connected to the NPN transistor Q5. Is connected to the microcomputer 5 via the. The output terminal O1 is supplied with 5 V DC power via a resistor R13. The output terminal O1 is connected to the microcomputer 5 via a resistor R14 and a scanning interface IF. Q6 in the figure is an NPN transistor that controls the interface IF based on a signal from the microcomputer 5. Further, the output terminal O2 is connected to a relay coil RL2 of the motor drive circuit 26 described later.

The input voltage detection circuit 24 has an input terminal I
When the input voltage to 1 and I2 is AC100V, a high-level detection signal is output to the output terminal O1, and a high-level coil switching signal is output to the output terminal O2. On the other hand, when the input voltage to the input terminals I1 and I2 is AC200V
Outputs a low-level detection signal to the output terminal O1.
At the same time, a low-level coil switching signal is output to the output terminal O2. The operation of the circuit based on the latch signal will be described later in detail together with the input voltage determination program.

Motor drive circuit 2 for drain pump described above
6 has a circuit configuration as shown in FIG. In the figure, RL1 and RL2 are relay coils, and RS1 and RS2 are switches driven by the respective relay coils RL1 and RL2. The switch RS1 is for controlling the supply of AC power to the motor 25, and the switch RS2 is for connecting the stator windings 25a and 25b of the motor 25 in parallel (AC10
0) and in series (for 200 VAC).

As shown in the drawing, the switch RS1 has its input side connected to the power line, the relay coil RL1 is connected to the microcomputer 5, and the relay coil RL2 is connected to the output terminal O2 of the input voltage detection circuit 24. .

The motor drive circuit 26 switches the relay switch RS2 to the position indicated by the solid line in the figure when a high-level coil switching signal is output from the output terminal O2 of the input voltage detection circuit 24, that is, when the input voltage is 100V AC. To connect the stator windings 25a and 25b of the motor 25 in parallel. On the other hand, when a low-level coil switching signal is output from the output terminal O2 of the input voltage detection circuit 24, that is, when the input voltage is 200V AC, the relay switch RS2 is switched to the position indicated by the broken line in the figure to change the stator winding of the motor 25. 25
a and 25b are connected in series. The relay coil RL1 is driven by a control signal from the microcomputer 5 to open and close the switch RS1. A second connector 30 is provided between the motor drive circuit 26 and the drain pump 25 . FIG. 4 is an electric circuit diagram showing the relationship between the drain pump motor 25 and the connector 30. In this figure, a connector 30 is composed of a pair of connectors 30a and 30b, and is configured such that the terminal numbers of the respective connectors match and are connected. R is the drain pump motor 2
5 represents the rotor.

FIG. 5 is an electric circuit diagram showing the second connector 30c, and 31 is a plug connected to a power supply. The terminals 1 and 3 of the connector 30c are connected by a wiring 32b, and the terminals 2 and 3 are connected by a wiring 32a. Plug 31 is connected to terminals 1 and 2. The connectors 30c and 30b are connected to the connector 30b such that the terminal numbers of the connectors 30c match.
Are formed.

FIG. 6 shows the second connector 30c connected to the connector 3
It is explanatory drawing which shows the state connected to 0b. Connecting the plug 31 to a power supply allows the stator windings 25a, 25b
Are connected in parallel to a power supply via a plug 31. Therefore, when the power supply is 100 V AC and the drain pump motor 25
Can be driven.

Next, an electric circuit of the outdoor unit will be described with reference to FIG. In the figure, 51 and 52 are indoors.
A power terminal connected to the power terminals 21 and 22 of the unit via a power line, and 53 is a communication terminal connected to the communication terminal 23 of the indoor unit via a communication line.

Reference numeral 54 denotes a power terminal 51,
A varistor connected to 52; 55 a noise filter;
6 is a choke coil, 57 is a voltage doubler circuit that doubles voltage rectifies an AC power supply to generate 280 V DC power, 58 is a noise filter, 59 is a smoothing circuit that smoothes doubled voltage, and 60 is a smoothing circuit via a fuse F. A motor drive circuit connected to 59 , 61 is a three-phase induction motor for driving the compressor of the refrigeration circuit. The above-described motor drive circuit 60 includes a microcomputer 63
And PWM control of energization to the compressor motor 61 based on a control signal from the inverter, using an inverter device in which six power transistors are connected in a three-phase bridge shape.

Reference numeral 62 denotes a serial circuit for converting control data (outside air temperature, current rotation speed of the compressor motor, etc.) from the microcomputer 63 into a serial signal or converting a serial signal transmitted from the indoor unit side. 53. A current detection circuit 64 detects a current supplied to the load of the outdoor unit by the current transformer 65, smoothes the DC voltage, and outputs the DC voltage to the microcomputer 63.
A control power supply circuit for generating a control DC power (5 V) used for the control and the like.
0 is connected to the input side.

The microcomputer 63 includes a ROM storing a program for controlling the operation of each device based on the control data transmitted from the indoor unit, a RAM storing the control data, and a CPU for executing the program. Are housed in the same package.

An outside air temperature sensor 67 detects the temperature of the outside air, a heat exchanger temperature sensor 68 detects the temperature of the outdoor heat exchanger, and a discharge temperature sensor 69 detects the refrigerant temperature on the discharge side of the compressor. The microcomputer 5 performs A / D conversion on the detection signals (analog signals) of these sensors and captures them.

Reference numeral 70 denotes an induction motor for driving a fan for an outdoor heat exchanger, and reference numeral 71 denotes an air volume control circuit having a plurality of switching contacts and switching contacts. Is selected to change the rotation speed of the motor 70 in three stages. 72 is a four-way valve of the refrigeration circuit, 73 is a triac for the four-way valve, 74 is a solenoid valve of the refrigeration circuit, 75 is a triac for the solenoid valve, and 76 is an air volume control circuit 71 and a triac 7 based on a control signal from the microcomputer 63.
3 and 75.

Next, the procedure for determining the input voltage in the air conditioner described above will be described with reference to FIG.

When the plug 1 of the indoor unit is inserted into the outlet for the air conditioner and the power is turned on after the installation of the air conditioner is completed (step ST1), both the determination counter n and the determination timer t are reset, and the determination timer t Starts (step ST2). Next, the determination counter n is set to 1
Is added to perform the first input voltage determination (step ST3).

In this determination, a detection signal is fetched from the input voltage circuit 24 and is input to the R of the microcomputer 5 of the indoor unit.
Comparison judgment using a judgment table stored in the OM,
More specifically, the detection is performed by comparing the detection signal with performance data unique to the air conditioner (steps ST4 and ST5). As described above, a high-level detection signal is output from the output terminal O1 of the input voltage circuit 24 to the microcomputer 5 when the AC power input through the plug 1 is AC 100V, and a low-level detection signal is output when the AC power is AC 200V. Is entered.

There are two types of single type air conditioners, one for AC 100V and the other for AC 200V, depending on the capacity. By the way, those with the abilities 20 & 25, 28 and 32 (unit is 100 Kcal) shown in FIG.
For C100V, capacity 40 and 50 (unit is 100
Kcal) is for AC200V.

As shown in FIG. 9, the abilities are 20 & 25 and 28.
In the cases of and 32, an OK determination is made when the input detection signal is at a high level, and an NG determination is made when the input detection signal is at a low level. If the capability is 40 or 50, OK is determined when the input detection signal is at a low level, and NG is determined if the input detection signal is at a high level.
Are determined respectively.

The above determination is repeated three times in succession.
It is determined that the input voltage is appropriate with the times coincidence, and the others are determined to be inappropriate (step ST6). In addition, there is a time limit in the above determination by the determination timer t. If the determination cannot be made within one second after the power is turned on, an inappropriate determination is made (step ST7).

If it is determined that the input voltage is appropriate, then a drain pump control latch signal is output to the input voltage detection circuit 24 (step ST).
8). This latch signal indicates that the drain pump motor 25 is damaged due to an incorrect voltage (AC100V
This is to prevent damage due to overvoltage when 0 V is supplied, and as shown in FIG.
8 and 32, when the input voltage is 100 V AC, the low-level latch signal is input to the input terminal I3 of the input voltage detection circuit 24.
To the input voltage detection circuit 24 according to the latch signal.
Coil AC 1 from the output terminal O2 coil switching signal of a high level of motor 25 is output to the motor drive circuit 26 of
They are connected in parallel to correspond to 00V . When the capability is 40 or 50 and the input voltage is 200 V AC, a high-level latch signal is output from the input terminal I of the input voltage detection circuit 24.
3 and an input voltage detection circuit 2
4 outputs a low-level coil switching signal from the output terminal O2 to the motor drive circuit 26, and the coil of the motor 25
They are connected in series to correspond to 200V. Thereafter, the normal operation is enabled, and the cooling operation, the heating operation, and the dehumidifying operation are appropriately performed based on the operation of the switch board 8 and the wireless remote controller 10 (step ST9).

On the other hand, when it is determined that the input voltage is inappropriate, the latch signal is output to the input voltage detection circuit 2 in the same manner as described above.
4 (step ST10). In this case, FIG.
As shown in (1), a low level latch signal is output to the input terminal I3 of the input voltage detection circuit 24 for all the capabilities, and the latch signal outputs the output terminal O2 of the input voltage detection circuit 24.
From the motor drive circuit 26
At the same time, the switch RS1 is opened, and the power supply to the drain pump motor 25 is cut off to prevent its failure. After this, the operation lamp 11a of the display panel 11
Is blinked at intervals of 3 seconds (step ST11), and this blinking indicates to the air conditioner installer that the input voltage is incorrect, that is, the voltage of the AC power supplied to the air conditioner outlet does not correspond to the installed model. Encourage interruption and rework of electrical wiring work.

As described above, according to the air conditioner of the present embodiment, even if the AC power supplied to the air conditioner outlet has a voltage error, the AC power supplied to the air conditioner outlet is turned on and off at the same time as the operation lamp 11a of the indoor unit blinks. There is an advantage that it is possible to promptly inform the air conditioner installation company of the voltage error and quickly take measures such as shutting off the power supply and redoing the wiring work. On the other hand, for the drain pump,
Even if there is no AC200V in such a case,
Drain pump directly with AC100V power supply
Can be operated by AC.
Operation check of drain pump until 200V is supplied
Installation of air conditioners, eliminating the negative effects
You can do the construction.

Moreover, since the input voltage is determined based on the performance data unique to the air conditioner, it is not necessary to newly input data dedicated to the determination, and the determination process suitable for the model can be realized.

Further, since the input voltage is determined three times in succession and the match is determined three times, an appropriate determination is made. Therefore, it is possible to prevent a determination error due to an external influence such as noise and to make an accurate determination. In addition, the reliability can be further improved by giving a time limit to the determination. . Further, the error of the input voltage is detected by using the existing operation lamp 11a.
Therefore, there is no need to provide new display means for display, which is advantageous in terms of cost.

Although the multi-type air conditioner has a capacity as shown in FIG. 7 similarly to the single-type air conditioner, usually, 200 V AC power is used for all the capacities. In this multi-type air conditioner, FIG.
As shown in FIG. 0, OK is determined when the input detection signal is low level (200V AC) and NG is determined when the input detection signal is high level (100V AC).

The latch signal output to the input voltage detecting circuit 24 when the input voltage is determined to be appropriate is at a high level in all the abilities, and when the input voltage is determined to be inappropriate, the input signal is detected. The latch signal output to the circuit 24 is at a low level for all capabilities. Incidentally, in the multi-type air conditioner, the capability data transmitted by serial communication from each outdoor unit may be added to the determination table, and the input voltage may be determined based on the added data.

Further, if the microcomputer can directly control the drive circuit of the drain pump motor without passing through the input voltage detection circuit, the components such as the output terminal O2, the input terminal I3 and the transistor in FIG. The circuit can be simplified.

[0050]

As described above, the present invention relates to an air conditioner in which drain water discharged from an indoor unit of an air conditioner is discharged outdoors using a drain pump. The windings have two systems of stator windings provided in parallel, and the control device of the air conditioner has a fixed system of the two systems according to the voltage of the power supply supplied to the air conditioner. A motor drive circuit that supplies power by switching the connection of the child windings to the power supply in parallel or in series, and supplies the power output from the motor drive circuit to the two stator windings of the drain pump motor Provided to the air conditioner.
When the power supply voltage is AC200V or AC100V
Also, it is necessary to drive the drain pump accordingly.
Can be. And the drain pump side of the connector in the connector of the pair, from the power source so as to be parallel with the electric power supplied from the power source the two systems of stator windings
Since directly connectable to a second connector for supplying terminals are formed, by the procedure such as electrical work AC200
It is possible to provide an air conditioner that can check the operation of the drain pump motor using the AC 100 V power supply even when the V power supply is not supplied.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram of an indoor unit.

FIG. 2 is a specific circuit diagram of an input voltage detection circuit.

FIG. 3 is a specific circuit diagram of a motor drive circuit for a drain pump.

FIG. 4 is a main part electric circuit diagram showing a drain pump and a connector.

FIG. 5 is an electric circuit showing a connector and a plug.

FIG. 6 is an electric circuit when the connector shown in FIG. 5 is connected to a drain pump.

FIG. 7 is an electric circuit diagram of the outdoor unit.

FIG. 8 is a flowchart of an input voltage determination program.

FIG. 9 is a determination table of a single type air conditioner.

FIG. 10 is a determination table of a multi-type air conditioner.

[Explanation of symbols]

 1 plug 5 microcomputer 11a operation lamp 24 input voltage detection circuit 30a connector 30b connector 30c connector

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-14022 (JP, A) JP-A-1-136602 (JP, A) Full-open sho 57-27891 (JP, U) Real-open sho 59- 71997 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F24F 11/02 102 F24F 1/00 361

Claims (1)

(57) [Claims] 1. A and the indoor side unit for regulating the temperature of the room air, drain to drain water out from the <br/> indoor unit outdoors
Pump and two stator windings provided in parallel.
Drain pump mode for driving the drain pump
And the power according to the voltage of the power supply.
Air conditioner with a motor drive circuit that outputs data to the
From the motor drive circuit to the drain pump motor
Is output power is switched from the power source as connected to the supply of the stator windings of the two systems are arranged in parallel or in series in accordance with the voltage of the power supplied to the air conditioner, and,
The drain pump motor includes a pair of connectors for supplying electric power output from the motor driving circuit to two stator windings of the drain pump motor, and includes a drain pump in the pair of connectors. Side connector from the power supply
And characterized in that connectable to the second connector which is wired to the power supplied in such a manner that in parallel with the stator windings of the two systems is supplied directly from the power supply terminal is formed Air conditioner.