JPS60233433A - Ventilator - Google Patents

Abstract

PURPOSE:To raise the life of the suction pump of a CO2 detector by detecting the concentration of CO2 in a sampling manner. CONSTITUTION:The measurement of the concentration of CO2 is made at timings t1, t2, and t3 at the interval of time t0. In this case, the operation of a suction pump 4 is made for the time tp immediately before the CO2 concentration detection timings t1, t2, and t3, or only for the portion shown by the oblique lines in the Fig., permitting the suction pump to be operated continuously and preventing the shortening of the life. In this case, the startup timing of the fan equals to the timing t1, t2, and t3, and the operational continuance time tx of the fan is determined by the deviation between a set CO2 concentration and detected value of CO2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The acid of the present invention is used to control CO2 concentration in living spaces.
This invention relates to a ventilation system that extends the life of the detection suction pump and allows various control methods to be applied to start/stop control of the fan.

Conventional configuration and its problems A conventional ventilation system for controlling CO2 concentration in a living space will be described with reference to FIGS. 1 and 2.

Figure 1 is a device diagram of a conventional example. In this figure, there are two regulators and a 002I11 degree detector 3 for measuring the gas to be measured in the outlet duct 6 sucked by the suction pump 4.
Based on the value of C02 and the upper and lower concentration limits of ±ΔC centered on the preset C02 concentration value C0, F10
It controlled start and stop. Next, referring to FIG. 2, the detected CO□ concentration value and the 777 start/stop status sI/c will be explained. In this map, 0021m! The degree is CO+ with respect to the set value C0K.
When the upper limit of ΔC is exceeded, 77 turns ON and C0-ΔC
It turns off when the value falls below the lower limit. At this time, the CO2 detector a needs to continuously measure the CO2 concentration, and the suction pump 4 is always in operation, so the life of the pump must be short, which hinders smooth operation as a ventilation control device. This was a contributing factor.

OBJECTS OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional drawbacks, and to
02# By performing degree detection in a sampling manner, C0
The purpose is to improve the life of the suction pump of the two detectors.

Structure of the invention The present invention includes a fan, a CO2 detector, a Co2 regulator,
The Co2 regulator starts the fan at regular time intervals, and the duration of operation after the fan starts depends on the C02 setting value and the C02 setting value.
This is a ventilation device that changes according to the difference between the o2 and the detected value.

DESCRIPTION OF EMBODIMENTS Examples of the present invention will be described below with reference to FIGS. 3 to 7.

FIG. 3 is a block diagram of the present invention, in which the same parts as in FIG. 1 of the conventional example are given the same numbers, and in particular, a method of controlling the regulator 7 that is different from the conventional example will be explained based on the diagram. FIG. 4 shows that the Co2 concentration measurement timing is carried out at intervals of time t0 at makichi 11, 12.13. At this time, as shown in FIG. 6, the operating state of the suction pump 4 is as follows.
1 immediately before CO2 concentration detection timing 11, 12.13
p time, that is, only the shaded part in this figure is ON.
By doing so, it is possible to prevent shortening of the life of the suction pump due to the continuous operation of the suction pump, which is a disadvantage of the conventional example.

A method for controlling the start and stop of the engine 7 and engine 1 when the detection is performed at time t3 will be explained based on FIGS. 6 and 7.

In FIG. 6, the fan startup timing is determined by the CO2
Equal to the concentration detection timings 14 and 12.13, the fan operation continuation time t is determined by the deviation between the set CO2 concentration and the detected CO2 value. FIG. 7 is an example showing the relationship between the value of 1x and the deviation. In this figure, the horizontal axis is the deviation between the set C02 concentration and the detected value, and the subordinate axis is the fan operation duration time, which is in a proportional relationship within a range of ΔC around the set value. Clasp, detected value or set value - ΔC
In the following, the operation duration is 0 at the startup timing, so
The 77-unit 1 remains in a stopped state until the next activation timing.

If it is equal to the set value, the continuous operation time is t at the startup timing of the fan 1. /2 Therefore, the fan is turned off until the next startup timing. /2 hours and remains stopped for the remaining p tO/2 hours.

Furthermore, if the detected value is equal to or greater than the set value 10ΔC, the operating duration is t0 at the startup timing, so the fan continues to operate until the next startup timing of the fan 1. In this embodiment, the fan operation continuation time t! and setting Co2
Although the relationship of 1 difference between the concentration and the emitter value was proportional control, the PI
Techniques used for analog control, such as D control, are applicable. In addition, the interval t0 of fan activation timing is variable depending on the space to be controlled, and even in the case of a space where the CO2 concentration fluctuates rapidly. This can be done by shortening .

Effects of the Invention As described above, the present invention has the following effects by performing the CO2 concentration detection timing and the fan activation timing at regular time intervals, and further controlling the fan operating time. In other words, by shortening the operation time of the suction pump of the C02 detector, the life of the detection device can be extended, and furthermore, the conventional QN1
Various control methods such as PID control can be applied to 0FF two-position control.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a conventional ventilation system, and Figure 2 is a diagram of the relationship between CO2 concentration and fan on/off status in the conventional example.
FIG. 3 is a block diagram of a ventilation system that uses the control method according to an embodiment of the present invention, FIG. 4 is a CO2 concentration detection timing diagram in the present invention, and FIG. 6 is a startup timing of a suction pump for CO2 detection. FIG. 6 is a diagram showing the start/stop state of the fan, and FIG. 7 is a diagram showing the relationship between the fan operation continuation time and the C02 concentration deviation value. 1...Fan, 3...C02 detector,
7...C02 regulator. − Name of agent Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure 4

Claims (1)

[Claims] The CO2 regulator has a ventilation fan, a 002 detector during ventilation, and a CO2 moderator, and the CO2 regulator starts the fan at regular time intervals, and the operation duration after starting is 71 CO2.
2. A ventilator that is variable depending on the difference between the set value and the detected value.