JPS6116899B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ventilation control device for a window air conditioner equipped with a ventilation function, which contributes to energy saving and provides comfortable air control.

A conventional ventilation control device for a window-mounted air conditioner is shown in the timing chart in FIG. As is clear from Figure 1, this is a thermostat that detects the indoor temperature and opens and closes the compressor to keep the indoor temperature constant, taking into account the outside temperature conditions. The system forcibly stops the cooling function and shifts to ventilation operation in which outside air is introduced by a fan motor.

In this method, when the outside temperature drops below a certain temperature,
By switching to ventilation operation, the system switches to a so-called wind fan, which has a certain cooling effect and energy saving effect, but since the ON/OFF conditions of the thermostat depending on the room temperature are not taken into consideration, the number of users is lower. There is a disadvantage that a cooling effect cannot be obtained when the indoor temperature is desired, and a disadvantage is that a ventilation effect cannot be obtained if the outside temperature is higher than the set outside temperature when a higher temperature setting is satisfied. . It also has the disadvantage that the ventilation damper chatters when the detected outside temperature is around the set temperature. In addition, as a conventional example, there is a device that has hysteresis in outside temperature detection,
There was a problem that providing stable hysteresis lowered the accuracy of outside temperature detection.

The present invention solves the above-mentioned drawbacks and provides a ventilation control device for a window-mounted air conditioner that performs more comfortable ventilation control. explain.

FIG. 2 shows an example of a circuit for realizing this embodiment.
1 is a P-channel MOS type microcomputer, 2 is a thermistor for detecting indoor temperature, 3 is a variable resistor for setting indoor temperature, 4 and 7 are voltage comparators, 5
is a hysteresis resistor that sets the ON/OFF width of the indoor temperature thermostat, 6 is a thermistor that detects the outside temperature, 8, 10, 12 are relay coils 9, 1
A transistor inverter that drives 1 and 13. The relay coils 9, 11, and 13 are for driving a compressor, a ventilation damper, and a fan motor, respectively.

The indoor temperature thermostat circuit, which is composed of a thermistor 2, a variable resistor 3, a resistor 5, a comparator 4, and a peripheral resistor, sends a high level signal to the input Iφ of the microcomputer 1 if the indoor temperature is higher than the setting.
If it is lower than the setting, input a low level signal. Similarly, an outside temperature determination circuit composed of a thermistor 6, a comparator 7, and a peripheral resistor inputs a high level signal to the input _I1 of the microcomputer 1 if the outside temperature is higher than the set value, and a low level signal if it is lower than the set value.

Relay coils 9, 11, 13 are driven via transistor inverters 8, 10, 12 by outputting high level signals to outputs 0φ, 01, 02 of microcomputer 1, respectively. Reference numeral 14 denotes an intermittent ventilation switch for logically setting the output of the outside temperature determination circuit to a high temperature output. When the intermittent ventilation switch 14 is turned on, a high level signal is input to input ₁ of the microcomputer 1.

Next, the operation will be explained using the flowchart shown in FIG. 3 and the timing chart shown in FIG. 4.

First, when the intermittent ventilation switch 14 is OFF, cooling operation is started, and during the second predetermined time of the fixed timer (hereinafter referred to as time _T2 ), the outside air judgment is not performed and normal cooling operation is performed. After time T ₂ has elapsed, the room temperature thermostat circuit (hereinafter abbreviated as "thermo")
If it is ON, cooling continues, and at the time the thermostat turns OFF, the outside temperature is either higher than the set temperature (hereinafter referred to as "outside high") or lower (hereinafter referred to as "outside low").
Determine whether Also, if the thermostat is off, an outside air judgment is made immediately. If the outside air temperature is high, the normal cooling operation will continue to be turned on and off, but if the outside air temperature is low, the ventilation damper will be opened and the fan motor will change the ventilation operation state.

Here, a first predetermined time T ₁ (hereinafter referred to as time T ₁ ) of a fixed time timer is provided to ensure the shortest ventilation operation time. Time T ₁ is used to prevent chattering due to slight fluctuations in the detected outside temperature and to prevent relay coil 9.
It has the role of a limit timer that guarantees the restart of the compressor when turned on.

When the relay coil 11 is turned ON and the ventilation operation is started, the ventilation operation is continued unconditionally for a time _T1 , and after the time _T1 has elapsed, it is determined whether the thermostat is ON or OFF. If the thermostat is on, the ventilation damper is immediately closed, the relay coil 9 is turned on, the compressor is turned on, and cooling operation begins. (At this point, time _T2 is reset.) If the thermostat is OFF here, ventilation operation will continue. However, even if the outside air temperature is high during this time, the ventilation damper will remain open. This is because if the indoor temperature is below the user's desired temperature, continuing ventilation even if the outside temperature is slightly higher than the set temperature will increase the overall ventilation effect and will not deteriorate the air conditioning feeling.

Next, after time T ₂ has elapsed, until the third predetermined time (hereinafter referred to as time T ₃ ) of the fixed timer (time T ₂ < time T ₃ ), the outside temperature is higher than the setting or the thermostat is We will explain the case where ventilation operation was not performed because it remained on. In this case, after time _T3 has elapsed, the ventilation operation is shifted to even if the outside temperature is high. As for the timing of transition to ventilation operation, as shown in FIGS. 3 and 4, the compressor is forcibly stopped and the ventilation operation is transitioned to synchronization with time _T2 . The return to cooling operation from ventilation depends on the thermo output after the aforementioned time _T1 . This is because if the cooling operation is continued for a certain period of time, the indoor air will gradually become polluted as the air conditioning only relies on the circulation of indoor air, so it is better to ventilate the room at regular intervals.

Regarding the timing of ventilation, if thermo output is taken into consideration, the thermostat may not turn off during high loads, so it will be forced to be synchronized with time _T3 .

Next, the case where the intermittent ventilation switch is ON will be explained. In this case, as shown in Figures 3 and 4, the above-mentioned contents are equivalent to the case where the outside air temperature is always high. It will be omitted.

In this case, normal cooling operation is performed until _{time T 3 ,} at which time the compressor is forcibly stopped and ventilation operation is started. Return to cooling operation is determined by thermo output after time _T1 has elapsed.

Note that the times T ₁ , T ₂ , and T ₃ may be set using a single timer or may be set using separate timers.

As described above, according to this embodiment, during normal cooling operation, the outside temperature is detected for the first time after time _T2 has elapsed, the indoor temperature has fallen to the set value, and the thermostat has been turned off, and it is determined whether to enter ventilation operation or not. Determine.
As a result, when the indoor temperature becomes sufficiently stable, natural cooling can be performed using outside air without impairing the user's feeling, contributing to energy saving and air purification. In addition, after a certain period of time set by a timer for stabilizing performance and protecting the compressor has elapsed, it detects whether the thermostat is turned on or off and detects whether or not cooling operation is to begin. If the thermostat is turned off, ventilation will continue, but this has the effect of ensuring a sufficient air conditioning temperature and providing the maximum air purification function.

Also, if the outside temperature is higher than the setting or the cooling load is large and the thermostat cannot be turned off, the
After T ₃ has elapsed, it is possible to forcibly perform ventilation operation for a period of time T ₁ . This provides energy saving and air purification functions under all operating conditions.

Further, when the intermittent ventilation switch 14 is turned on, it is possible to perform ventilation at an appropriate frequency after the indoor temperature has stabilized and the air conditioning temperature is maintained, regardless of the outside temperature. Furthermore, since the outside air temperature determination circuit output and the intermittent ventilation output are input to the same input terminal of the microcomputer, this greatly contributes to the rationalization of the circuit and the software of the microcomputer.

As is clear from the description of the embodiments above, the ventilation control device for a window-mounted air conditioner of the present invention satisfies desired indoor temperature conditions with a simple configuration, and
At any set temperature, sufficient ventilation efficiency and air purification function can be ensured without impairing the temperature control effect, and furthermore, it has extremely remarkable effects such as increasing the accuracy of outside temperature detection.

[Brief explanation of the drawing]

FIG. 1 is a timing chart of a conventional ventilation control device for a window-mounted air conditioner, FIG. 2 is an electrical circuit diagram of a ventilation control device for a window-mounted air conditioner according to an embodiment of the present invention, and FIG. 4 is a flowchart of the operation of the ventilation control device, FIG. 4 is a timing chart of the ventilation control device, and FIG. 5 is a block diagram showing the present invention in terms of function realizing means. 2... Thermistor for indoor temperature detection, 6... Thermistor for outside temperature detection, 9... Relay coil for compressor, 11
...Relay coil for ventilation damper (ventilation circuit), 13
...Relay coil for fan motor, 14...Intermittent ventilation switch (manual switch).

Claims (1)

[Claims] 1 A compressor that constitutes a refrigeration cycle, a ventilation system, a thermostat that controls indoor temperature, an outside temperature determination circuit based on fixed point settings, and a manual switch that logically sets the output of the outside temperature determination circuit to a high temperature output. and a fixed time timer that sets first, second, and third predetermined times, and after the cooling operation starts and after the second set time of the predetermined timer has elapsed, and of the thermostat.
a first control means that determines the outside temperature in the outside temperature determination circuit when the outside temperature is turned off, and operates the ventilation device during a first predetermined time of the fixed time timer only when the detected outside temperature is lower than the fixed point setting; , after the first set time of the fixed timer has elapsed, the output of the thermostat is determined, and if the thermostat output is ON, the compressor is operated; if the thermostat output is OFF, the ventilator is operated. a second control means for continuing the ventilation operation, and if the ventilation operation has not been completed by the time the third predetermined time of the fixed timer has elapsed after the start of the cooling operation, the outside temperature determination circuit and the thermostat; The window-mounted air conditioner has a third control means that operates the ventilation device to perform ventilation operation regardless of the output, and further includes an input from the manual switch so that the output of the outside temperature determination circuit can be output when the temperature is high. ventilation control device.