JPS6054563B2 - Air conditioner control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for an air conditioner, and in particular to a control device for an air conditioner, which is capable of continuing cooling under comfortable conditions in a cooling air conditioner.

Generally, room temperature and humidity control for air conditioners is done by controlling the compressor on and off based on the detection output of a room temperature detector such as a room thermostat, thereby keeping the room temperature and humidity within a range that is expected to provide comfortable conditions. .

That is, as shown in FIG. 1, when the room temperature reaches the cooling start temperature KoN, the room temperature detector generates an ON output to drive the cooling compressor, thereby bringing the room temperature to the cooling stop temperature. When it becomes FF, an off output is generated to stop the cooling compressor. By the way, if you do this, the point in time.

- When the cooling load is smaller than the refrigeration capacity, as shown by the period L in , , the compressor frequently starts and stops cooling in a relatively short period of time, so the indoor condition is within the comfortable temperature and humidity range. Therefore, it does not cause discomfort to people. On the other hand, when the cooling load becomes large and becomes almost the same as the refrigeration capacity, as shown by the period Tl of 2,
After the room temperature reaches the cooling start temperature KoN, it returns to the cooling stop temperature.

It takes a long time to reach FF (as shown by the broken line a, the room temperature continues to drop even after the period Tl). If this happens, the humidity will drop too much and the temperature will drop below the comfortable range, causing discomfort for people.Also, people who are in the cold air circulation zone will be exposed to cold air for a long time, and There is a problem in that the amount of power is wasted because cooling causes discomfort to people. In consideration of the above points, the present invention attempts to solve these problems all at once, and when the cooling operation continues for a long time as described above with reference to FIG. The time point that continues for more than time Ti is the scheduled time T from then on at O.

The compressor is stopped during this period to stop cooling. An example of the present invention will be described below in detail with reference to the drawings. As shown in FIG. It is driven and stopped by the open contact 52C1.

In other words, the room thermostat RT is connected to the solenoid 5 of the magnetic switch via the normally closed contact Xb of the auxiliary relay
2C, and the compressor COM is connected to the power supplies P1 and P2 through the contact 52C1 of the magnetic switch.

A timer TMl as a first timer means for limiting the cooling time is connected in parallel to the solenoid 52C of the magnetic switch, and its normally open contact TMla is connected to a timer TMl as a second timer means for releasing the cooling restriction through the room thermostat RT. Connected to TM2. This second timer TM2 has its normally closed contact TIl! in parallel. Auxiliary relay X is connected through 42b. A normally open contact Xa of the auxiliary relay X is connected in parallel with the contact TMla as a self-holding contact. In the configuration shown in FIG. 2, the cooling period T shown in FIG.
.

At the point in time, the room temperature is the cooling start temperature K. When the temperature is higher than N, the room thermostat RT closes and the magnet switch 52C is energized. Here auxiliary relay
is in a closed state because the contact TMla of the first timer TM1 is not yet closed and is not excited. However, as the magnetic switch 52C is energized, its contact 5
The compressor COM is driven through 2Ca, and the room temperature accordingly decreases.

At the same time, the first timer TMl starts its time-limiting operation. By the way, period T.

Since the cooling load is greater than the refrigerating capacity of the compressor COM, the room temperature decreases relatively quickly and quickly reaches the cooling start temperature K. The cooling stop temperature KOFF is reached through N, which opens the room thermostat RT. Therefore, the solenoid 52C of the magnetic switch and the first timer TM
Since l becomes de-energized, the compressor COM stops. At this point, the room temperature starts to rise, but at this point in time when cooling is stopped, the first timer TMl is still connected to its normally open contact TMl.
Since the auxiliary relay X is de-energized before it is closed, the auxiliary relay
This state will continue as l becomes de-energized and stops the time-limited operation.

Thereafter, the room temperature reaches the cooling start temperature K at time T2.

When the temperature reaches N and the room thermostat RT closes, from this point on, the solenoid 52C of the magnetic switch and the timer TMl are energized, so that the compression W&COM
is driven and the room temperature begins to drop, and the timer TMl starts its time-limiting operation. Similarly, when the room temperature reaches the cooling stop temperature KO group relatively quickly, the compressor? 0M stops, and then the room temperature becomes the cooling start temperature K. Starts to rise to N,
In this way, the room can be maintained at a comfortable temperature and humidity. When the cooling load increases from this state and becomes almost equal to the refrigerating capacity of the compressed McOM, the time Tll shown in period T1 in FIG.
When the room thermostat RT is closed and the magnetic switch solenoid 52C and the first timer TMl are energized (FIG. 3A), the compressor? The room thermostat RT does not open during the time T1 from when 0M starts cooling until the contact TMla of the timer TMl closes, and therefore the auxiliary relay is activated at the time Tl2 when the time limit T1 of the first timer TMl has elapsed. X and second timer TM
2 is excited, and this excited state is self-maintained by contact X1. Then, at time Tl2, the contact Xa of the auxiliary relay X opens, causing the magnet switch 52C to become de-energized, thereby forcibly releasing the compression 4ac0M from its cooling state.

Therefore, the room temperature rises as shown in the curve part h, but when it reaches the cooling start temperature KON, the room thermostat RT
Even if TM2 is closed, the second timer TM2 still expires! HTT
'2, the self-holding by the contact Xa of the auxiliary relay X is not released, so the magnetic switch 52C continues to maintain the de-energized state.

Therefore, the compressor COM continues to maintain the cooling stopped state, and the room temperature continues to rise. Eventually, when the time limit T2 of the second timer TM2 elapses, the normally closed contact TM2b opens (FIG. 3B) and releases the self-holding state of the auxiliary relay X.

At this time, the contact Xb closes and the magnetic switch 52
C and the first timer TMl are excited, and the compressor COM starts cooling operation. After this point Tl8, the cooling load returns to its original size in the above-mentioned section T.

The same operation as above is performed to maintain the room temperature at a comfortable condition, but whenever the cooling load becomes approximately equal to the refrigerating capacity of the compressor COM, the operation in the above-mentioned section T1 is performed each time. As described above, according to the present invention, the compressor Q is forcibly compressed for a scheduled time.
By placing the OM in a cooling-stop state, the humidity can be prevented from dropping below a comfortable condition due to the dehumidifying effect caused by the cooling operation of the compressor COM over a long period of time.

In addition, by interrupting the compression and 1C0M cooling operation in the middle, the person in the cold air circulation zone is not exposed to cold air continuously for a long time, which further reduces discomfort. , it also reduces power consumption. FIG. 4 shows another embodiment of the present invention, in which the control circuit 1 has a digital logic circuit configuration, and the first timer TM) shown in FIG. 2 serves as the first timer means. A first binary counter CTl and a second timer corresponding to the second timer TM2 in FIG. 2 are used as the second timer means.
A binary counter CT2 is provided.

However, as a counting input of the first counter CTl, the clock pulse CP is applied via an input AND gate ANl which receives an open control signal S1 which assumes a logic level RL when the room thermostat RT is closed.

The overflow output S2 of the first counter CTl is given to the output NAND gate NN as an open control signal.

The output of the logic RlJ of the room thermostat RT is inverted and given to this output NAND gate NN by the inverter IN, so that when the room thermostat RT is closed, the overflow output S2 is not obtained from the first counter CTl. A drive signal S3 to the compressor COM is sent from the NAND gate NN under the condition that: On the other hand, the input AND gate AN2 of the second counter CT2
The overflow output S2 of the first counter CTl is given as an open control signal to the control signal, and the output of the room thermostat RT is also given as an open control signal, so that the room thermostat RT is closed and the first counter CT
1 is sending out an overflow output S2, the input gate AN2 is opened to input the clock pulse CP to the second counter CT2. Note that the output of the inverter and the overflow output of the second counter CT2 are input as a clear signal S4 to the first counter CTl through a two-input OR gate 0R.

Further, the output of the inverter IN is given to the second counter CT2 as a clear signal S8. Thus, the first and second counters CTl and CT2 have a clear signal of logic Rl.
It will be cleared when it becomes J. In the configuration of FIG. 4, the cooling load is in section T of FIG.

If the room thermostat RT is closed, the input AND gate AN of the first counter CTl is
1 is opened and the counter CTl starts counting, but before the overflow output S2 is sent out yet, the room temperature rapidly drops and the room thermostat RT opens, so that the counter CTl is cleared. Therefore, at this time, the overflow output S2 from the first counter CTl
is not sent out, the output of the inverter IN is sent out as it is through the output NAND gate NN, and as a result, the compressor COM causes the room thermostat RT to "open".
Each time the closing operation is performed, the cooling operation is started or stopped accordingly. On the other hand, when the cooling load reaches the state of section T1 in Fig. 1, the room thermostat RT closes and the first
The room temperature reaches the cooling stop temperature K between the time the counter CT1 starts counting and the time it sends out the overflow output S2.

Since it does not fall below FF, the first counter CTl is not cleared and therefore its overflow output S
By closing the output NAND gate NN by 2,
The sending of the l drive signal S3 to the compressor COM is forcibly prohibited. Then, the room temperature starts to rise, and at this time, the input AND gate AN2 of the second counter CT2 is opened by the overflow output S2 of the first counter CTl, so that the second counter CT2 starts counting operation. , eventually generates an overflow output S,. The overflow output S5 of the second counter CT2 is used as the clear signal S4 of the first counter CTl, and as the overflow output S2 of the first counter CTl is no longer obtained, the prohibition on the output NAND gate NN is canceled. . In this way, also in the case of FIG. 4, if the cooling time by the compressor COM is longer than the time Ia'1 until the first counter CTl overflows, the compressor COM is By forcibly stopping , the same effect as described above with respect to FIG. 2 can be obtained. In addition to this effect, in the case of FIG. 4, the control circuit 1 can be configured as an integrated circuit, thereby making it possible to obtain a control device with a low cost as a whole.

[Brief explanation of the drawing]

Figure 1 is a curve diagram used to explain temperature control by an air conditioner.
FIG. 2 is a connection diagram showing an example of an air conditioner control device according to the present invention, FIG. 3 is a signal waveform diagram for explaining its operation, and FIG. 4 is a connection diagram showing another example of the present invention. . TMl, TM2...Timer, 52C...Magnetic switch, COM...Compressor, X...
...Auxiliary relay, RT...Room thermostat, CTl, CT2...Counter.

Claims (1)

[Claims] 1. By starting the cooling compressor when the room temperature reaches the cooling start temperature or higher according to the output of the room temperature detector, and then stopping the cooling compressor when the room temperature falls below the cooling stop temperature, In an air conditioner control device configured to maintain a room at a comfortable temperature and humidity state, when the cooling compressor starts cooling based on the cooling start temperature detection output of the room temperature detector, the cooling start temperature detection output a first time-determined operation for starting a time-limited operation, and sending out a stop output for forcibly stopping the cooling compressor when the time-limited time has elapsed;
A timer means and a stop output sent from the first timer means start a time-limited operation, and when the time limit elapses, a release output is sent to release the forced stop state of the cooling compressor. 1. A control device for an air conditioner, comprising: second timer means for controlling an air conditioner.