JPS5848814B2 - air conditioner - Google Patents

Description

[Detailed description of the invention] The present invention relates to an air conditioner.

When operating an air conditioner for cooling, it is normal to stop the operation after 1 to 2 hours, especially when sleeping, to prevent the device from getting too cold while sleeping. After the air conditioner stops operating, the room temperature may rise rapidly, causing discomfort such as sweating or waking up.

In order to eliminate the above-mentioned drawbacks, the present invention gradually increases the set temperature of the cooling operation, and is improved so as not to cause discomfort to the body.

Similarly, in heating operation, it is not good for health if the room temperature suddenly drops after the air conditioner stops operating.

Therefore, in the present invention, the set temperature is gradually lowered during heating operation.

To achieve this purpose, the present applicant has provided a timer and an electric heater near the thermostat that exerts a thermal effect on the thermostat, and has linked the energization rate of the heater to the timer to reduce the heat generated by the heater. We have previously proposed a system in which the set temperature of the thermostat is substantially changed by changing the amount over time (see Japanese Patent Application No. 52-22081).

However, this method has the drawback that variations in the set temperature occur depending on how the electric heater is attached, and that the power consumption of the heater is lost.

The present invention further eliminates these points and provides an air conditioner that has a simple structure and has no variation in set temperature.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

In FIG. 1, SW1 is a running switch, and SW2 is turned on only when the start switch is pressed.

SW3 sets the air volume of the indoor fan M1 to 3 levels H. A speed change switch that switches between M and L, and the above switches SW, , S
It is provided along with W2 on the front panel of the harmonizer main body.

In addition to the blower M1 mentioned above, the primary coil of the transformer T in FIG. Capacity relay RY3
etc. are connected in parallel.

In addition, C1 is the operating capacitor of the indoor fan M1, and Y1 is the operating capacitor of the indoor fan M1.
, Y2, and Y3 are relays RY1, RY2, and R, respectively.
This is the relay contact of Y3.

On the secondary side of the transformer T, there is a timer means (■
C1, ■C2,...etc.), temperature control means for maintaining the room temperature at the set temperature (IC4, TH, Tr1
o, etc.), set temperature changing means (C3, Tr1 to Tr7, etc.) for changing the set temperature in stages, and the details will be explained in the following operation description.

First, after turning on the operation switch SW1 and applying power to the primary coil of the transformer T, when the start switch SW2 is pressed, the AC voltage stepped down by the transformer is applied via the switch SW2, and the voltage is applied to the diode D1 and the capacitor C2. The rectified and smoothed current flows through relay RY1 and transistor Trg.

As a result, relay contacts Y' and Y1 each turn on and maintain that state, so even if the start switch SW2 is released, current flows and the secondary power source and blower M are turned on.

Note that ZD is a Zener diode for constant voltage.

Therefore, after the start switch SW2 is pressed, the stepped-down DC voltage is continuously applied to the various control means.

The timer means to which a DC voltage is applied mainly consists of a comparator IC and a digital counter c2.

That is, one of the features of the present invention is that a digital counter is used as a timer to measure the operating time of the air conditioner.

The comparator C1 repeatedly generates a high level signal and a low level signal at a constant period, and is composed of a comparator IC, and uses the output of the IC as a clock signal for time measurement.

Low resistors R25 and R2 are used to set the voltage input to the ten terminals of the above comparator IC, and resistor R26, variable resistor R1, and capacitor C3 are used to set the voltage input to one terminal of the above IC. be.

The on/off repetition period of C1 above is therefore the resistance R
26, VR, and the value of capacitor C3.

(2) C2 is a pinary counter in which, for example, 14 stages of T-type flip-flops are connected, is made up of an IC, and is used as a digital counter for timekeeping.

Sunawa? This ■C2 has GND, VDD, CL as terminals.
It has EAR, CLOCK, Q, , Q4 to Q14, and counts up the contents each time the clock signal is introduced to the clock input terminal CLOCK.

Since the counter C2 has 14 stages of flip-flops connected in cascade, it is possible to count up to the 14th power of 2. In this embodiment, as shown in FIG. When the topmost flip-flop becomes "1", that is, "8 1"
It is configured such that counting ends when 9 2 '' is counted.

That is, the contents of the topmost flip-flop are outputted via the IC terminal Q14, but this output is supplied to the base of the transistor Tr8 via the resistor R3o, and when this output goes to "H" level, The transistor Trg is turned on, and as a result, the drive of the relay RY1 is stopped via the transistor Tr9.

Therefore, when the counter IC2 counts "8192", the relay contacts Y1 and Y1 are released, the secondary side power is turned off, and as a result, the counter IC2 stops counting.

At this time, the relay contacts Y2 and Y3 are always open, so the blower M1 and the compressor M2 are also turned off at the same time, and as a result, the timer operation of the air conditioner ends.

In this way, counter ■C2 calculates the operating time of the air conditioner.
It plays the role of a timer that regulates the time to count 8192 clock signals.

Therefore, the one-hour timer setting during timer operation is determined by the variable knob of the variable resistor VR1 (provided on the front panel).

) to change the resistance value of variable resistor VR1,
This is done by changing the pulse period of the clock signal.

For example, if the pulse period of the cross signal is 1 second, one hour of the timer set in the digital counter C2 is 8
This is 192 seconds, or about 2 hours and 17 minutes, and if it is 2 seconds, it is 16,384 seconds, about 4 hours and 34 minutes.

It should be noted that an auto-clear device is added to the digital counter 2C2 so that it automatically enters a clear state (all flip-flops are reset) when the power is turned on.

That is, resistance R2,? 2. Capacitor C4 is a circuit that generates a clear signal using the transient phenomenon when the power is turned on. It is connected to the clear IC terminal CLEAR of the counter C2, and generates a clear signal only when the power is turned on, and the digital counter Clear the contents of.

Next, the temperature control means for maintaining the room temperature at the set temperature are comparator ■C4, thermistor TH, variable resistor ■R2,
It is composed of a transistor Tr1o, a relay RY2, etc.

The comparator IC4 is outputted from the comparator IC, compares the voltage on the ten-terminal side and the voltage on the one-terminal side, and outputs a high level if the ten-terminal side is high, and outputs a low level if the one-terminal side is high.

The resistor R16 and thermistor TH set the input voltage of the single-power terminal \ of the above IC4, and the resistor R1
, variable resistor ■R2 and resistors R1 to R8 are + of the above IC4.
This is to set the input voltage of input terminal 1\.

In this circuit, the resistance value of the thermistor TH corresponds to room temperature, and the resistance value of variable resistor VR corresponds to the set temperature.

That is, when setting the room temperature to a desired room temperature, the resistance value of the resistor R2 is set to a predetermined value by operating the variable resistance knob of the variable resistor VR2 provided on the front panel.

Once the value of variable resistor ■R2 is determined, the input voltage of terminal 1 will remain constant from then on, but the input voltage of terminal 1 will correspond to room temperature because the resistance value of the thermistor TH changes according to the room temperature. and fluctuate.

Therefore, the comparator C4 outputs the rHJ level or the rLJ level when the room temperature fluctuates above or below the set temperature.

In the case of cooling operation, when the output of comparator C4 reaches the rHJ level, transistor T'rlO turns on and drives relay RY2, which also drives relay RY3 to turn on compressor M2 and perform cooling operation.

As a result, the room temperature decreases and the resistance value of the thermistor TH increases, and when the output of the above IC4 becomes [-L] level, the relay R
The drive of Y2 is stopped, and the operation of compressor M2 is also stopped.

In this way, an operation is performed to maintain the room temperature at the set temperature.

The series-connected resistors R1 to R8 change the set temperature stepwise in one direction over time, and are unique to the present invention.

The resistors R2 to R8 are transistors Tr1 to T, respectively.
It is short-circuited to the power supply terminal via r7.

These transistors Tr1 to Tr7 serve as a decoder (described later).
The on/off state is controlled by the output of C3.

The set temperature changing means that changes the set temperature stepwise over time mainly consists of a decoder C3 and a transistor T.
r = Tr, resistance R - R8 or 1
It consists of 7 1 elements.

The decoder C3 operates on the lower 3 of the upper 4 flip-flops of the 14 flip-flops of the counter C2.
This is to receive the contents of the stage (outputs from output terminals Qll to Q13) and distinguish them into eight types of signals as shown in Fig. 2.
It consists of an IC.

Only one terminal of the output of the decoder C3 becomes high level at regular intervals, and the relationship with the contents of the counter C2 is as shown in FIG.

The output terminals "1" to "7" of the decoder C3 are connected to the bases of the transistors Tr1 to Tr7, respectively, and the on/off states of the transistors are controlled.

Therefore, in the present invention, the voltage input to the ten terminal of the comparator C4 varies depending on whether the transistors Tr1 to Tr8 are turned on or off, thereby substantially changing the set temperature.

Now, when the power supply voltage is applied to the comparator 1C1, a clock signal having a period of, for example, 1 second is generated, as described above, and is applied to the digital counter 2C2.

Counter C2 receives the clock signal from O to O as shown in Figure 2.
While counting 1023 times, that is, for 1023 seconds, all outputs Q1 to Q4 are at low level ((L), and as a result, all outputs of decoder C3 are also at (I Ltj level), so transistors Trl to Tr7 are All are turned off.

Therefore, a voltage is applied to the input terminal of the comparator C4 in accordance with the temperature set by the temperature setting knob.

When the room temperature is higher than the set temperature, the comparator C4 outputs a high level, turns on the transistor Tr1o, and drives the relay RY2.

As a result, contact Y2 closes and turns on compressor M2 directly.
Since relay RY3 that controls off is driven, contact Y3
, Y3 are closed and compressor M2 is activated.

The operation of this compressor M2 is to detect that the room temperature has become lower than the set temperature via the comparator I via thermistor TH.
This continues until C4 detects it and turns off the transistor Tr1o.

Kelp? When the operation of the compressor M2 stops, the room temperature rises in accordance with external conditions, and when the room temperature exceeds the set temperature, the compressor M2 starts operating again as described above.

In this way, the room temperature is maintained at the set temperature, and during this time, the counter 2C2 continues to count the clock signals.

The contents of counter ■C2 are from “1 0 2 3”
1 0 2 4", the output terminal Qll becomes high level and as a result, the terminal "1" of the decoder ■C3 also becomes rHJ.
Since the level changes, the transistor Tr1 turns on, the resistor R is short-circuited, and the resistance value of the series resistor group R1 to R8 decreases.

Similarly, when counter ■C2 counts ``2 0 4 8'', transistor Tr2 is turned on and resistor R1,
R2 is short-circuited, and the resistance values of the series resistance group R1 to R8 further decrease.

Below counter ■C2 is "3 0 7 2", '
“4 0 9 6”, ゛5 1 2 0”...
The resistance value decreases step by step every time... is counted.

Therefore, as time passes, the set temperature will rise substantially, and the room temperature will also rise accordingly.

In this embodiment, since the resistance values of the resistors R1 to R8 are the same, the set temperature also changes within a substantially constant temperature range.

However, if the resistance value of each resistor R1 to R8 is increased sequentially,
Alternatively, if it is made smaller, the range of change in the set temperature will also increase or decrease over time.

According to this embodiment, the set temperature increases in seven steps every 1024 seconds (approximately 17 minutes), so a sudden temperature increase does not occur after the timer operation is stopped.

When the counter ■C2 counts "8 1 9 2", the output Q14 becomes rHJ level, so the driving of the relay RY1 is stopped via the transistors Tr8 and Tr9, and the secondary side of the blower M1, compressor M2, and transformer T is controlled. All the means are turned off and the timer operation is stopped.

When the timer operation is stopped, the operation switch SW1 remains on, so some power is consumed.

In order to prevent this, it is advisable to add a means to mechanically release the operation switch SW1 when the timer operation is stopped.

Further, although the above embodiment deals with the case of cooling operation, the set temperature can be gradually lowered in the same manner in the case of heating operation.

However, in this case, it is necessary to take some measures to gradually increase the resistance value of the resistors connected in series.

Since the air conditioner of the present invention changes the set temperature in stages over time, unlike conventional air conditioners, if you run the air conditioner while sleeping, for example, your body will become too cold. If the cooling operation is stopped later, the room temperature will rise rapidly after the cooling operation is stopped, causing discomfort and causing problems such as disturbing sleep.
Similar problems do not occur during heating operation.

Furthermore, since the air conditioner of the present invention automatically changes the set temperature based on the contents of the digital counter used as a timer means for measuring the operating time, the time counter is used as a timer for changing the set temperature. It can also be used as a control means and has a very simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention. FIG. 2 is an explanatory diagram for explaining FIG. 1. SW1
: Operation switch, SW2 : Start switch, M2:
Compressor, T: Transformer, IC1, IC4: Comparator, IC2: Counter, IC3: Decoder, T
H: Thermistor, Tr1 to Tr7: Transistor, R
1 to R8: Resistor, ■R2: Variable resistor.

Claims (1)

[Scope of Claims] 1. A signal that generates a clock signal having a constant frequency in an air conditioner having a timer means for specifying the operating time of the device and a temperature control means for maintaining the room temperature at a desired set temperature. The timer means is constituted by a generating means and a digital counter for counting the clock signal, and a decoder is provided for converting the count contents of the digital counter into a digital signal for controlling the set temperature, and the digital signal from the decoder is provided. A set temperature changing means is provided for raising or lowering the set temperature of the temperature control means in steps, and the set temperature is changed step by step with the passage of time when the timer means is driven. harmonization device.