JPS5916185B2 - Air conditioner control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to preheating operation during heating operation of an air conditioner equipped with a compressor, and provides a blower for effectively eliminating cold drafts that occur immediately after the start of heating operation and providing comfortable air conditioning. related to control of electric motors.

In conventional air conditioners, in order to prevent cold drafts, it is common practice to stop the blower motor for a predetermined period of time immediately after the start of heating operation.

With this method, the blower motor may be operated before the conditions for blowing hot air have been established, or the blower may be operated for an unnecessarily long time even though the conditions for blowing hot air have been established. There was a problem with the electric motor being stopped, and the comfort was not always satisfactory.

The present invention eliminates the above-mentioned conventional drawbacks, allows air to be properly blown during heating, and provides comfortable and efficient heating.

As a configuration for this purpose, the present invention includes a temperature detection circuit that detects the temperature of an indoor heat exchanger and outputs a high temperature output when the temperature reaches a predetermined temperature, and a temperature detection circuit that starts operation by the high temperature output of the temperature detection circuit for a predetermined time. a first timer that starts operating later, a second timer that starts operating at the same time as the heating operation of the compressor starts and starts operating after a predetermined time, and an electric motor that starts operating the indoor blower motor when the first timer or the second timer operates. A control means is provided.

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

FIG. 1 is an electrical circuit diagram of an air conditioner according to an embodiment of the present invention.

In the figure, 1 is a commercial power supply, 2 is an operation switch, 3 is a cooling/heating changeover switch, 3C(/'i is a cooling contact, and 3H is a heating contact.

4 is a thermostat which closes to the contact 4H side when the room temperature is higher than the set temperature, and closes to the contact 4L side when the room temperature is lower.

5 is an electric motor for an indoor blower, 6 is an electric motor for a compressor,
Reference numeral 7 designates an electric motor for an outdoor blower, 8 a four-way valve for switching the refrigeration cycle between cooling and heating, and 10 a de-icer contact for removing frost adhering to the outdoor heat exchanger during heating operation.

9 is a control device for controlling the operation of the electric motor 5, and has a motor control means 9A, for example, a relay contact.

The control device 9 (ri) has the configuration shown in FIG. 2, for example.

Commercial power for heating is obtained from terminals a and b, and this is connected to transformer 9.
DC power is obtained from the 0A1 diode bridge 90B1 and the capacitor 90C, and is used as the power source for the following circuit.

In the temperature detection circuit, one side of the bridge is a thermistor 91B attached to the heat exchanger or piping to detect the temperature of the indoor heat exchanger, and the other three sides are resistors 91A, 91C, and 91D.
and a comparator that determines whether the heat exchanger temperature has reached a predetermined temperature based on the polarity of the bridge output.

If the temperature is below a predetermined temperature, the resistance value of the thermistor 91B is a dog, so the comparator output will be low, that is, a low temperature output, and if it is above a predetermined temperature, it will be high, that is, a high temperature output.

The first timer includes a resistor 92FG1 a comparator 92H1 a diode 92A1 a resistor 92B1 and a capacitor 92C.

If the temperature detection circuit output, that is, the output of the comparator 91F is low, the capacitor 92C/l'i is not charged, the output of the comparator 92H becomes low, and the relay coil 9AC
Current flows through, relay contact 9A opens, and motor 5//'
i It is stopped.

If the output of the temperature detection circuit becomes high due to preheating operation, the first timer starts operating and the capacitor 92C is charged. lapses, the output of the comparator 92H becomes high, and the relay coil 9AC
No current flows and the relay contact 9A closes and the motor 5 operates.

The second timer is the diode 92A1 resistor 9 of the first timer.
All parts other than 2B are shared, and a resistor 92D and a diode 92F are further added.

Immediately after the heating is turned off, the capacitor 92C is charged via the resistor 92D, and the voltage becomes V.

If exceeds the voltage VR, the output of the comparator 92H is set to high regardless of the output of the temperature detection circuit, and the relay contact 9A is
is closed and the electric motor 5 is operated.

The operating time of the first timer is several seconds at most since the function of the first timer is to prevent malfunction of the temperature detection circuit.

On the other hand, since the timer time of the second timer is to terminate the preheating operation regardless of the output of the temperature detection circuit, it is sufficient that the second timer operates when the room temperature is normally extremely low and the outside temperature is extremely low. Therefore, its operating time is on the order of minutes.

Therefore, there is no problem even if the capacitor 92C is shared.

The diode 92E used for the second timer is for rapidly discharging the charge in the capacitor 92C after the operation switch 2 is turned off.

As described above, according to the present invention, the preheating operation during heating operation is basically controlled by the indoor heat exchanger temperature, and furthermore, the first timer for preventing malfunction of the temperature detection circuit and the maximum preheating operation time are provided. Since it has a second timer for regulation, it is possible to efficiently obtain very comfortable air conditioning without performing unnecessary preheating operation.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram of an air conditioner control device according to an embodiment of the present invention, and FIG. 2 is an electric circuit diagram of a main part of the control device. 5...Indoor blower electric motor, 9...Control device, 9A...Relay contact (motor control means), 92AC...Relay coil, 91B...・
...Thermistor, 91A, 9IC, 91D...
・Resistance, 92A, 92E...Diode, 92
B, 92D, 92F, 92G...Resistance, 92C
・・・・・・Capacitor.

Claims (1)

[Claims] 1. A temperature detection circuit that detects the temperature of the indoor heat exchanger and outputs a high temperature output when the temperature reaches a predetermined temperature; a first timer that starts operation based on the high temperature output of the temperature detection circuit and operates after a predetermined time; a second timer that starts operating at the same time as heating operation starts and operates after a predetermined time;
An air conditioner control device comprising a motor control means for starting operation of an indoor blower motor by activation of a timer or a second timer.