JPS5929778B2 - ventilation control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to ventilation of a space that is air conditioned by an air conditioner, and relates to a ventilation control device that performs ventilation at a timing that is well matched with the air conditioner.

Conventional ventilation is a type in which ventilation is performed manually based on the judgment of the person living in the air conditioned space, or ventilation is performed at regular intervals for a certain period of time, and is independent of the operation of the air conditioner. It was carried out in

This kind of condition, especially when considering home air conditioners, is carried out completely ignoring the capacity of the air conditioner.
For example, ventilation may be performed while cooling operation is stopped.

Although this is desirable from the perspective of introducing outside air, it is rather undesirable from the perspective of providing a comfortable space, which is the original purpose of air conditioning, considering the response delay of the thermostat attached to the air conditioner.

In other words, there is an unnecessary rise in room temperature, which causes discomfort.

This situation is the same when the heating operation is stopped.

In view of the above-mentioned conventional drawbacks, the present invention controls ventilation in accordance with the timing of stopping the operation of an air conditioner that has a thermostat that can be stopped depending on the room temperature.
This reduces the discomfort caused by introducing outside air through ventilation.

Reference numeral 1 denotes an electric motor for an air conditioner or a compressor, and its operation/stop is controlled by a thermostat described below.

The thermostat includes a variable resistor 5 for setting room temperature, a thermostat 6 for detecting room temperature, a bridge that also includes resistors 7 and 8, a comparator 10 that outputs a "Hl" or rLoJ signal depending on the bridge output, a differential resistor 9, and a comparator. 10, a transistor 12 for energizing and controlling the coil/Iz1RC of the relay contact 1R that stops the operation of the air conditioner or compressor 1 according to the output, a current-limiting resistor 11, a DC power source 3,
It consists of a power switch 4.

This thermostat is for cooling, and if the room temperature is higher than the set temperature, the output of the comparator 10 becomes bi, and the transistor 12 is turned on. The relay coil 1RC is energized, the relay contact 1R is turned on, and the air conditioner 1 is operated.

The ventilation control device is constructed as follows.

The storage means for storing that the air conditioner 1 has stopped due to the thermostat is stored when the output of the comparator 10 is rLoJ.
, the relay contact 1R turns off and the air conditioner 1 stops, so the output of the comparator 10 reaches "LO" even once.
”, this voltage is divided by the resistor 13.14 and becomes AV
It becomes Lo and becomes the positive input of the 1 comparator 18, while the negative input is the voltage BVCC obtained by dividing the DC power supply voltage VCC by the resistors 15 and 16, AVLO<BVCC, and the diode 19 is used to latch.

When the comparator 10 output becomes rLoJ, AVLO<
Beyond BVCC, the output of comparator 18 becomes low,
The positive input becomes approximately zero V due to the diode 19 regardless of Hi*Lo of the output of the comparator 10, and the stoppage of the air conditioner is stored as rLoJ of the output of the comparator 18.

On the other hand, the oscillator 20. In the first timer, which is composed of a NOR gate 21 and a counter 22, the output of the counter 22 is low, and after a certain period of time T1 has elapsed, the output of the counter 22 becomes bi, and the NOR gate 21 outputs the clock pulse from the oscillator 20. Therefore, the counter 22 output maintains rHiJ.

Therefore, the comparator 10 outputs rHi J, the air conditioner 1 is operating, and the output of the storage means, that is, the output of the comparator 18, is rLoJ and the inverter gate 30
If the output is rHi j and 10 or more hours have passed since the start of operation, that is, the first timer output is rHiJ, AND
The NO gate 21 becomes FHiJ, the output of the OR gate 27 becomes rHiJ, and this signal causes current to flow to the transistor 29 via the resistor 28, and the relay coil 2RC
is energized, relay contact 2R is turned on, and ventilation means 2 such as a ventilation fan is turned on.

When the OR gate 27 output becomes "Hl", the oscillator 20,
A third timer consisting of an AND gate 23 and a counter 24 and maintaining ventilation for a certain period of time after the start of ventilation is triggered.

In other words, the OR gate 27 output becomes rHiJ, so AN
D gate 23 inputs the clock pulse from oscillator 20 to counter 24 .

After a certain period of time T3, the output of the counter 24 becomes rHiJ,
While resetting the counter 22 and the counter 24,
In order to turn on the transistor 32 through the resistor 31 and set the negative input of the comparator 18 to zero V, the comparator 1
The output of 8 becomes "Hl", and the stored contents of the storage means are cleared.

As a result of this reset, the output of the counter 22 becomes "LO", the output of the AND gate 26 becomes rLoJ, the transistor 29 is turned off, the relay contact 2R is turned off, the ventilation means is stopped, and ventilation ends.

If the air conditioner 1 never stops within the time T1 set by the first timer and does not stop even after that, there will be no chance for ventilation.

In order to eliminate this problem, a second timer is provided.

That is, the oscillator 20. It consists of a counter 25, and when the time T2 set by the second timer elapses, the counter 2
The output of 5 becomes rHi J, and the OR gate output 27 becomes r
It becomes HiJ and ventilation starts.

After a certain period of time T3, the counter 25 is also reset by the third timer, and ventilation ends.

The capacitor 17 is used to delay the rise of the negative input of the comparator 18 in a transient state immediately after the switch 4 is turned on, thereby preventing malfunction of the storage means.

The above description has been made in the case of cooling, but the same operation can be obtained in heating by exchanging the positions of the variable resistor 5 and thermistor 6 of the thermostat.

Further, the device of the present invention may be provided independently (or may be built into an air conditioner).

Also, most of the circuits in the drawings, i.e. storage means,
The first to third timers, gates, etc. can be replaced by a microcomputer.

As described above, according to the present invention, basically, the ventilation operation starts after confirming that the air conditioner has stopped, so the outside air is introduced once the temperature of the air conditioned space has reached the predetermined set temperature. It can reduce the discomfort caused by

In addition, since this ventilation is always performed when the air conditioner is in operation, it is performed while lowering or increasing the room temperature.
Can reduce discomfort.

Furthermore, as a brake, the second timer allows ventilation to be performed even if the operation is never stopped after the start of operation, so it does not mean that outside air is not introduced at all.

[Brief explanation of the drawing]

The drawing is a circuit diagram of a ventilation control device in one embodiment of the present invention. 18... Comparator, 22, 24.25...
...Counter, 2...Ventilation means, 2R...
...Relay contact.

Claims (1)

[Scope of Claims] 1. Means for storing the fact that ventilation of a space air-conditioned by an air conditioner has been stopped by a thermostat shortly after the air conditioner starts operating; This ventilation control device includes a timer that outputs an output after a predetermined time and a timer that starts ventilation by ANDing the air conditioner operation signal, maintains ventilation for a certain period of time after the start of ventilation, and ends ventilation according to the output of this timer. 2. Means for storing that ventilation of a space being air conditioned by an air conditioner is stopped by a thermostat at least once after the air conditioner starts operating, and a timer that outputs an output after a predetermined time after the air conditioner starts operating. , A timer is provided to start ventilation by ANDing the air conditioner operation signal, and maintain ventilation for a certain period of time after the start of ventilation, and if the air conditioner is not stopped by the thermostat even after the start of operation, the operation starts for the predetermined time. Ventilation control device equipped with a timer that starts ventilation after output.