JPS6151218B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a temperature controller for a heat pump type air conditioner for both cooling and heating,
The purpose is to provide an air conditioner equipped with a temperature controller that has excellent temperature control characteristics, especially during heating.

In conventional air conditioners of this type, a temperature sensor detects the temperature of the indoor air sucked into the indoor unit, and the compressor is turned on and off based on the output of the temperature sensor to adjust the indoor temperature. was doing. However, with this method, there is a considerable difference between the temperature detected by the temperature detector of the indoor unit and the temperature of the person's living position indoors due to the indoor temperature distribution and the so-called wall effect, so the indoor temperature is set to the optimum temperature. It is difficult to adjust to In addition, when the temperature detector detects a certain temperature and stops the compressor, the fan of the indoor unit continues to operate to detect the indoor temperature, so during heating, relatively low temperature air is transferred indoors. There are disadvantages such as the air bubbles coming out and causing discomfort to the occupants.

The present invention is intended to provide an air conditioner free from the above-mentioned drawbacks, and includes a temperature sensor for detecting the temperature of indoor air sucked in by an indoor fan motor, and a temperature sensor for detecting the temperature of indoor air sucked by an indoor fan motor. a temperature controller operated by the output, the temperature controller comprising:
The compressor and the fan motor are stopped when the temperature detected by the temperature sensor reaches a predetermined temperature, and the predetermined temperature sensor has a predetermined differential with respect to the predetermined first temperature. A timer mechanism is provided that starts a timing operation when the second temperature is reached and restarts them after a certain period of time, and the timer mechanism substantially controls the stop time of the compressor and fan motor, and This is a heat pump type air conditioner for heating and cooling that performs temperature control that compensates for the difference in temperature between the detected temperature and the living space, which occurs based on the temperature distribution of the room.

An embodiment of the invention will be described with reference to FIG. The figure shows a separate room air conditioner.
is an indoor unit, and 2 is an outdoor unit. 3 is a compressor, 4 is a four-way valve that switches the direction of refrigerant, 5 is an outdoor heat exchanger (evaporator for heating, condenser for cooling) 6 is a fan motor for the outdoor heat exchanger, 7 is a throttle valve for heating , 8 is a cooling check valve. 9 is an indoor heat exchanger (condenser for heating, evaporator for cooling) 1
0 is a fan motor for an indoor heat exchanger, 11 is a cooling throttle valve, and 12 is a heating check valve. 13 is a temperature sensor installed at the air intake port of indoor unit 1;
14 is a temperature controller equipped with a timer mechanism that operates according to the output of the temperature controller, which is connected to the compressor 3 and the outdoor fan motor 6.
and controls on/off of the indoor fan motor 10.

Next, its effect will be explained. During heating, the refrigerant coming out of the compressor 3 passes through the four-way valve 4 and is condensed in the indoor heat exchanger 9, passes through the heating check valve 12, is depressurized by the heating throttle valve 7, and is transferred to the outdoor heat exchanger 5. It evaporates and returns to compressor 3. When the temperature detected by the temperature detector 13 reaches a predetermined temperature, the temperature controller 14
stops the compressor 3, outdoor fan motor 6, and indoor fan motor 10. Furthermore, temperature controller 1
4 is equipped with a timer mechanism that starts the timing operation when the detected temperature reaches a second predetermined temperature having a certain differential with respect to the predetermined temperature, and restarts these after a predetermined time elapses. It is configured to allow

FIG. 2 shows one embodiment of a specific circuit of the device of the present invention. In the figure, 15 is a thermistor, which corresponds to the temperature sensor 13 in FIG. Thermistor 15 forms two sides of a temperature detection bridge circuit together with resistors 16, 17, 18 and variable resistor 19.
The detected temperature signal is compared by a comparator 23 with a reference signal on the reference side of the bridge circuit defined by resistors 20, 21, and 22. 3A shows the temperature detected by the thermistor 15, and B shows the waveform of the output A of the comparator 23 in FIG. C is the waveform of voltage B of the capacitor 24, D is the comparator 25
The waveform of the output C and E indicate the operating states of the compressor 3, the outdoor fan motor 6, and the indoor fan motor 10.

In FIG. 3A, when t=to, the temperature is lower than the set value _T1 , so the output A of the comparator 23 is "high" as shown in FIG. 3B. At time t ₁ the temperature is T ₁
The output A becomes "low". Therefore, the transistor 28 is turned on by the resistors 26 and 27, and the capacitor 24 is rapidly charged through the current limiting resistor 29, and the voltage B has a waveform as shown in FIG. 3C. Therefore, the output C of comparator 25
is low because the voltage across the capacitor 24 is greater than the reference voltage V determined by the resistors 30, 31, and 32, resulting in a waveform as shown in FIG. 3D. Therefore, the transistor 35 is turned on by the resistors 33 and 34, the relay coil 36 is energized, the relay contacts 37 and 38 are switched to the opposite contacts, and the compressor 3, outdoor fan motor 6, and indoor fan motor 10 are stopped. .

Even if the compressor 3 stops at time t ₁ , the thermistor 15
The temperature detected by increases for a while,
After t ₂ hours the temperature drops to T ₂ . If the temperature difference between T ₁ and T ₂ is set small, the time from t ₁ to t ₂ is extremely short, and the capacitor 2 described later
The discharge time (time from t ₂ to t ₃ ) of No. 4 can be made much shorter. Now, at time _t2 , when the temperature of the thermistor reaches _T2 , the output A of the comparator 23 becomes "high" and the transistor 28
is turned off. Therefore, the voltage B of the capacitor 24 decreases as shown in FIG. 3C by a time constant determined by the resistor 39 and the variable resistor 40. When the voltage drops to V, the output C of the comparator 25 becomes "high", and the transistor 35 turns off.
Relay contacts 37 and 38 return as shown, and driving of compressor 3, outdoor fan motor 6, and indoor fan motor 10 is resumed. That is, as is clear from FIG. 3, the temperature is controlled by the thermistor 15.
When T ₁ is detected, the compressor 3, outdoor fan motor 6 and indoor fan motor 10 are stopped, and then
T ₁ has a small differential with respect to T ₁
When a slightly lower predetermined temperature T ₂ is detected and it is detected that the room temperature is falling, the timer mechanism consisting of the capacitor 24 etc. starts the timing operation and restarts the compressor 3 etc. after a certain period of time. let When the heating load is in a normal state due to the above control operation, the stop period of the compressor 3 etc. will be controlled by the above-mentioned time limit mechanism, and the living space caused by indoor temperature distribution etc. The inconvenience caused by the temperature difference between the temperature detection position and the temperature detection position can be eliminated by controlling the stop time of the compressor 3 and the indoor fan motor 10 using a timer mechanism. In particular, if the indoor fan motor 10 is stopped while the compressor is stopped, the difference between the temperature detected by the temperature detector 3 and the actual temperature of the living space becomes large. This allows for more comfortable temperature control. Therefore, while the compressor 3 is stopped, the indoor fan motor 10 can be stopped while the temperature of the living space is properly controlled, thereby eliminating discomfort caused by cold air.

Switches 41 and 4 that are linked in FIG.
2 and switch 43 are air-conditioning/heating changeover switches, and during cooling, changeover switches 41 and 42 close contacts on the opposite side of the illustration, and switch 43 closes its contacts. Therefore, the temperature of the thermistor 15 supplies a voltage opposite to that during heating to the comparator 23, and the indoor fan motor 10 is continuously driven regardless of whether the compressor 3 is on or off. 44 is a diode connected in parallel with the relay coil 36, and 45 is an AC power source.

In the above embodiment, the compressor and the indoor fan motor are turned on and off in synchronization, but in consideration of the thermal time constant of the refrigerant system, a second timer mechanism is further provided in the temperature controller 14 to By turning the indoor fan motor on and off slightly later than when it is turned on and off, you can achieve more comfortable temperature control.

As described above, according to the present invention, when the temperature of the intake air detected by the temperature detector reaches the predetermined first temperature, the compressor and the indoor fan motor are stopped, and the temperature is increased to the first temperature. A timer mechanism is provided that starts the timing operation when a predetermined second temperature with a certain differential is reached, and this timer mechanism restarts the clock after a certain period of time. This eliminates inconveniences in temperature control caused by the difference between the detected temperature and the temperature of the living space, and enables comfortable temperature control with small temperature swings. In particular, when the indoor fan motor is stopped, the above-mentioned temperature difference is amplified, so the temperature swing in the living space becomes extremely large if only temperature control is used, but this inconvenience can be prevented by the timer mechanism of the present invention. . Therefore, when the compressor is off, the fan motor is also stopped, so there is no discomfort caused by blowing out cold air during heating, and power consumption can be saved, among other advantages.

[Brief explanation of the drawing]

Figure 1: Block diagram showing the configuration of the present invention, Figure 2
Figure: Diagram showing one embodiment of the control circuit of the present invention, No. 3
Figure: An explanatory diagram of the operation of the present invention. A is the thermistor 15
Detected temperature, B is a diagram showing the output A of the comparator 23,
C is a diagram showing the potential B of the capacitor 24, D is a diagram showing the output C of the comparator 25, and E is a diagram showing the operating states of the compressor 3 and fan motors 6 and 10. 1...Indoor unit, 2...Outdoor unit, 3
... Compressor, 5 ... Outdoor heat exchanger, 6 ... Outdoor fan motor, 9 ... Indoor heat exchanger, 10 ... Indoor fan motor, 13 ... Temperature detector, 14 ... Temperature controller, 15 ...Thermistor.

Claims (1)

[Claims] 1 It has a temperature detector that detects the temperature of the indoor air sucked in by the indoor fan motor, and a temperature controller that operates based on the output of the temperature detector, and the temperature controller is configured to detect the temperature When the temperature detected by the temperature detector reaches a predetermined first temperature, the compressor and fan motor are stopped, and the temperature detected by the temperature detector reaches a predetermined first temperature. a timer mechanism that starts a timing operation when a predetermined second temperature having a differential temperature is reached and restarts the compressor and fan motor after a certain period of time; A heat pump type air conditioner for air conditioning and heating that has a configuration that substantially controls the stop time of a fan motor.