JPS5943691B2 - Air conditioner control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for an air conditioner having a cooling function and a dehumidifying function.

Generally, this type of air conditioner includes a refrigerant circuit 1 as shown in FIG. 1, for example.

The refrigerant circuit 1 includes a compressor 2, an outdoor heat exchanger 3, a parallel circuit of a first solenoid valve SC1 and a first pressure reducer 4, a first indoor heat exchanger 5, a second solenoid valve SC2, and a parallel circuit of a first solenoid valve SC1 and a first pressure reducer 4. A parallel circuit of two pressure reducers 6 and a second indoor heat exchanger 7 are connected in an annular manner via piping.

Then, when the first solenoid valve SC1 is closed and the second solenoid valve SC2 is opened to operate the drive motor of the compressor 2, the refrigerant flows in the direction of the solid arrow in the refrigerant circuit 1, and the outdoor heat exchange is performed. A cooling cycle is formed in which the vessel 3 acts as a condenser and the two indoor heat exchangers 5, 7 act as evaporators.

In this case, indoor air circulated by the fan motor is passed through both indoor heat exchangers 5. Cooling and dehumidification are performed at γ, and indoor cooling operation is performed.

Also, when the first solenoid valve SC1 is opened and the second solenoid valve SC2 is closed to operate the compressor 7 motor, the refrigerant flows in the direction of the broken line arrow in the refrigerant circuit 1, and the outdoor heat exchanger 3 and A dehumidification cycle is formed in which the first indoor heat exchanger 5 acts as a condenser and the second indoor heat exchanger 7 acts as an evaporator.

In this case, the indoor air is cooled and dehumidified in the second indoor heat exchanger I, and then reheated in the first indoor heat exchanger 5.
Indoor dehumidification operation will be performed.

By the way, conventional air conditioner control devices are equipped with a thermo device that compares the room temperature and the set temperature, and when a cooling command is issued, the compressor motor is operated intermittently based on the thermo output, and the cooling operation and blowing operation are alternated. −、、、、、
The room temperature can be maintained near the set temperature, and when a dehumidification command is issued, the compressor motor is operated continuously, and the solenoid valves SCI and SC2 are switched based on the thermo output to alternately perform cooling operation and dehumidification operation to set the room temperature. The aim was to dehumidify the indoor air while maintaining the temperature close to that level.

For this reason, when a dehumidification command is issued, the solenoid valves SC1 and SC2 are required to switch when there is a large difference between high and low pressures in the refrigerant circuit 1, so it is necessary to use valves with large power to overcome the EE-force difference. In addition to being expensive, the switching sound was loud (and often caused discomfort to residents).

The present invention has been made in view of the above-mentioned facts, and includes a thermo device that compares room temperature with a set temperature, and an output of this thermo device that is sent to a timer device during cooling operation and via an output change detection device during dehumidification operation. and a solenoid valve drive device that alternately switches the refrigerant circuit between a cooling cycle and a dehumidification cycle using the output of the thermo device during dehumidification operation, and the timer device. It is characterized by stopping the compressor motor for a predetermined period of time when activated. This is aimed at reducing operating costs3.
゜An embodiment of the present invention will be described below based on the drawings.

FIG. 2 shows a control circuit applied to an air conditioner equipped with the refrigerant circuit 1 shown in FIG.

In the figure, 8 is an AC power supply, 9 is an operation switch, 10 is a wind speed changeover switch, FM is a fan motor supplied with power via the operation switch 9 and the wind speed changeover switch 10, and CM
is operation switch 9 and normally open IJ Lz-switch X1
3, which is a moke for driving the compressor 2, which is supplied with power via 1;
The solenoid valve SC2 is connected to the operation switch 9 and the switch 1. - energized through the normally closed contact a of the switch
311 is an overvoltage absorbing element, 12 is energized through U7.
13 is a step-down transformer, 13 is a rectifier circuit, 14 is a constant current LL circuit, and 11.12 is f, 3 wires connected to the constant voltage circuit 14.

Reference numerals 15 and 16 designate a variable resistor 1 for setting the room temperature, such as a thermistor connected in series between the busbars 1L and 12.
7 and resistor 18, resistor 19 and 20, comparator 23 in which comparison terminal 231 and reference terminal 232 are connected to output points 21 and 22 of the inner series circuit, respectively, and output terminal 233 of comparator 23 and comparison terminal 231. feedback resistor 24 connected to
The power terminals 234 and 235 of the comparator 23 are connected to the bus N and t2, respectively, and the input terminal 251 of the comparator 23 is connected to the output terminal 13 of the comparator 23. This is an output change detection device for the thermoelectric device 15, which generates a negative bus A at the output terminal 252 when the output of the thermoelectric device 15 is switched.
2 is connected to the dehumidification contact d of the cold switching switch f26, and the terminal 253 is connected to L)J and line 12.

27 has an input terminal 271 connected to the cooling switching switch, the cooling contact C of the isochi 26 to the input 13, and the dehumidifying contact d to the 11 change detection device 25.
A timer device connected to the output terminal r.252 of the
When electric power and EE- are supplied to the input terminal 271 of the device,
After a few seconds, the relay X1 for controlling the race inch X11 is connected to the output terminal f-272, and the input terminal 271
This is a known method in which the relay X1 is not energized again for several minutes (about 1 to 3 minutes) once the voltage is removed.

, 28 has an input terminal 281 connected to the output line 13,
The output terminal 282 is an electromagnetic valve driving device connected to the bus bar 11 via a relay X2 for controlling the relay switch X21 and a cool changeover switch 29 which is interlocked with the cooldown changeover switch 26. We are prepared.

Note that the dehumidification contact d of the cool changeover switch 26 is connected to the bus bar 11 via a resistor 41 .

,Then, first of all, the cooling changeover switch 26 is the cooling contact.

We will now describe the time when the cotton tassel command is activated and the cool changeover switch 29 is opened.

When the operation switch 9 is closed, the fan motor FM is energized via the operation switch 9 and the wind speed changeover switch 10, and starts operating at an arbitrary speed.

At this time, if the room temperature is higher than the set humidity, the thermo device 15
The voltage at output point 21 becomes higher than output point 22, and comparator 2
The output terminal 233 of No. 3 generates an on output that becomes a high voltage.

The ON output of the thermo circuit 150 is supplied to the input terminal 271 of the evening/timer device 2γ via the output line 13 and the cooling contact C, and after a few seconds the output terminal 272 of the TAFIMAR device 21
becomes a low voltage, energizing relay X1.

Accordingly, the compressor motor CM is energized via the raceway X11 and is activated sequentially, for example, 3 seconds later than the fan motor FM.

In this case, since the dehumidification contact d of the output change detection device 25 is separated from the input terminal 271 of the timer device 270, the circuit operation is not affected.

In addition, since the solenoid valve drive device 28 has the cold changeover switch 29 open, the relay X2 is not energized.
Solenoid valve SC2 has operation switch 9 and relay switch X2
Electricity is supplied through the normally closed contact point 3 of 1, so that the refrigerant circuit 1 becomes a cooling cycle, and the air conditioner starts cooling the room.

When the room temperature drops to the set temperature, the thermo device 15 issues an off output in which the output terminal 233 of the comparator 23 becomes a low voltage, so the input terminal of the tie-7 device 27 drops and the relay X10 is deenergized.

As a result, the air conditioner only performs air blowing operation using the fan motor FM, and resumes cooling operation when the room temperature rises by the differential value of the comparator 23.
By repeating this, the room temperature is maintained near the set temperature that is arbitrarily adjusted by the variable resistor 173.In addition, the timer device 27 has the above-mentioned delayed output and the operation switch 9 is turned on frequently within a short period of time. , or when the thermo device 15 outputs an OFF output within a short period of time after the OFF output is output, the relay X10 is prevented from being energized for the time required until the pressure of the refrigerant circuit 1 is balanced. tlr-L prevents overcurrent from flowing to the compressor motor CM.

Next, the cool changeover switch 26 is turned on to the dehumidification contact d,
A description will be given of the time when a dehumidification command is issued in which the cool switching switch 29 is closed.

In this case, it is assumed that the operation switch 9 is closed, and the difference from when the cooling command is issued is that the cooling selector switch 29 is closed.
With the closing of the circuit, the ON/OFF output of the thermo device 150 is sent to the input terminal 2 of the solenoid valve drive circuit 28 via the output line 13.
81, the relay X2 connected to the output terminal 282 is controlled.

That is, while the thermo device 150 is generating ON output, the transistor 30 is on and the transistor 31 is off, relay X2 is not energized, and solenoid valve SC2 is energized.
The refrigerant circuit 1 forms a cooling cycle, and the thermo device 15 generates an off output [relay X2 is energized by the electromagnetic valve drive device 28, and the electromagnetic valve SC1 is activated in place of the electromagnetic valve SC2. Since the refrigerant [-1 path 1 is dehumidified, it becomes a barrel.

On the other hand, since high voltage is supplied to the input terminal 271 of the timer device 27 through the path of the bus bar 1, the resistor 41, and the dehumidifying contact d, the relay X1 is energized several seconds after this supply, and the thermo device 15 is turned on and off. No matter which output is being output, the compressor MO/CM is operated.

However, the output of the thermo device 15 is supplied to the input terminal 251 of the output change detection device 250, and the device 25 outputs the output terminal every time the thermo device 15 switches the output from on to off or from off to on. In order to generate a negative pulse at 252, the timer device 27 temporarily lowers its input terminal to turn off the relay
When the negative pulse of the output change detection device 25 disappears, the evening/timer device 2
7 is again supplied with a high voltage to the DJ line 11, but the relay X1 is energized several minutes (1 to 3 minutes) after the negative pulse disappears.

In this way, when a dehumidification command is issued, the cooling operation is performed while the thermo device 150 is generating ON output, and the dehumidification operation is performed while OFF output is generated, so that the room can be dehumidified while maintaining the room temperature near the set temperature. I can do it.

Furthermore, since the timer device 27 is activated by detecting that the output of the thermo device 15 is switched from on to off and from off to on, and the compressor motor CM is stopped for the required time, the solenoid valve SC1 , After SC2 receives the switching command from the drive device 28, the pressure balance of the refrigerant circuit 1 progresses, and a silent type that can be used for opening and closing only when the difference between high and low pressures is small can be used. , compressor motor CM
The system restarts after the pressure is balanced, so there is no problem and, in fact, operating costs can be reduced.1-
1. Even if the operation switch 9 is mistakenly turned on and off frequently during this dehumidification command, the timer device 27 can protect the compressor upper CM.

FIG. 3 shows a specific circuit example of the output change detection device 25, in which the input terminal 251 is connected to the capacitor 32 and the resistor 33.
is connected to the base of the NPN transistor 34 and the emitter of the NPN transistor 35 through a series circuit of
FIG. 2 is shown for sections 1 and 3 in which the output terminal 252 is connected to the collectors of both transistors 34 and 35, and the terminal 253 is connected via a resistor 36 to the emitter of the transistor 34 and to the base of the transistor 350. To clarify, while the thermo device 15 is generating an off output, there is no residual charge in the capacitor 32, both the L transistors 34 and 35 are off, and the output terminal 252 is at a high voltage. .

Now, when an ON output is output from the thermo device 15, the output line 13, the input terminal 251, the capacitor 32 and the resistor 33
The base current of transistor 340 flows through transistor 34, turning on transistor 34 for a short time until capacitor 32 has finished charging to the polarity shown, producing a negative pulse at output terminal 252.

Next, when the output of the thermo device 15 changes from on to off,
Capacitor 32? lVi is the input terminal 251, the output line 13, the output terminal 233 of the comparator 23, and the power supply terminal 23
5, discharge occurs in a short time between the /+J line 12° terminal 253, the resistor 36, the transistor 350 pace and emitter, and through the resistor 33. During this time, the transistor 35 is turned on and a negative pulse is generated at the output terminal 252. do.

FIG. 4 shows another circuit example of the output change detection device 25, which differs from the one in FIG. 3 by using a capacitor instead of the resistor 330. A series circuit of a diode 3.gamma. and a resistor 38 is inserted between the capacitor 32 and the base of the transistor 340, and a series circuit of a diode 39 and a resistor 40 is inserted between the capacitor 32 and the emitter of the transistor 35.

In this case, by selecting the resistor 38,400, the capacitor 3
2, the negative pulses generated at the output terminal 252 during charging and discharging can be made equal in time [D].

Note that the diode 31 prevents a reverse bias from being applied to the transistor 34 when the transistor 350 is on, and the diode 39 prevents a reverse bias from being applied to the transistor 35 when the transistor 340 is on.

As described above, the present invention provides a cooling switching means that supplies the output of a thermostat that compares room temperature and a set temperature to the timer device during cooling operation and to the timer device via an output change detection device during dehumidification operation, and and a solenoid valve drive device that alternately switches the refrigerant circuit between a cooling cycle, a dehumidifying cycle, and a barrel using the output of the thermo device, and the compressor motor is stopped for a required time by operating the timer device. As a result, a silent type solenoid valve with almost no switching noise can be used as a cycle switching solenoid valve.
There is no risk of causing discomfort to the occupants due to switching noise, and at the same time, it is possible to reduce operating costs.

In addition, by using a timer device for delayed start and forced start suppression of the compressor motor, even when the compressor motor is restarted by thermocycle during cooling operation, the compressor motor is stopped for the required time. The compressor motor can be protected, and since it is only necessary to add an output change detection device of the thermo device to the tF, it can be constructed at an extremely low cost6.

[Brief explanation of the drawing]

Fig. 1 is a refrigerant circuit diagram showing an example of an air conditioner to which the present invention can be applied, Fig. 2 is an electric circuit diagram showing an embodiment of the device of the present invention, and Figs. 3 and 4 are respectively Fig. 2. FIG. 2 is an electric circuit diagram showing a specific example of an output change detection device used in FIG. 1... Refrigerant circuit, SC1, SC2...
Solenoid valve, 15...Thermo device, 25...
・Output change detection device, 27... Timer device,
28... Solenoid valve drive device, CM... Compressor motor.

Claims (1)

[Claims] 1. A thermostat that compares the room temperature with a set temperature, and a cooling switching means that supplies the d-j of the thermostat to a timer device during cooling operation and to the timer device via an output change detection device during dehumidification operation, The air compressor is equipped with a solenoid valve drive device that alternately switches the refrigerant circuit between a cooling cycle and a dehumidification cycle using the output of the thermo device during dehumidification operation, and the compressor motor is stopped for a required period of time by the operation of the timer device. Control device for harmonizer.