JPH0226607A - Control device for air clarifier - Google Patents

Abstract

PURPOSE:To avoid an excess and deficiency of operation time with regard to size of a room while an air clarifier is made to operate with a gas sensor by making a setup time of a timer variable in accordance with the size of the room. CONSTITUTION:An air clarifier is equipped with a gas sensor 2 and a control unit 1 operated by a microcomputer. The control unit 1 makes an operation of the air clarifier start owing to an output increase of the gas sensor 2. The air clarifier is also equipped with a detection device for detecting a saturation in the variation of gas sensor output with the lapse of time. And a timer device, which makes the operation of the air clarifier stop at a prescribed setup time after the saturation in the variation of gas sensor output is detected, is also installed. This setup time can be controlled in accordance with the size of a room by the timer device.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to the control of air cleaners using gas sensors, and is used, for example, to control air cleaners for living rooms and vehicles.

(b) Prior art Related prior art can be found, for example, in JP-A-56-131゜412 and JP-A-60-27.849.
Smoking, which is the main cause of indoor air pollution, is accompanied by a sharp increase in gas concentration, and these technologies can be
It focuses on the fact that it can be distinguished from atmospheric pollution due to humidity fluctuations or pollution.

(c) Problems to be Solved by the Invention All of these prior art technologies detect the elimination of air pollution from a decrease in sensor output. However, the ability to purify gas is insufficient, and with air purifiers that focus on removing dust from the air, the sensor output does not decrease and the air purifier does not stop even if sufficient dust is removed. Become. Therefore,
The applicant of this application is Japanese Patent Application No. 62-235854 (Showa 62-235854)
(filed on October 20, 2017), a control device that uses a gas sensor to control an air purifier with unbalanced dust and gas purification capabilities, and in particular stops the purification operation after a certain period of time from the point at which the gas concentration detected by the gas sensor is saturated. proposed a control device to

However, if the purification operation is terminated after a certain period of time from the point at which the gas concentration is saturated, the following problems may occur.

(1) If the size of the room in which the air purifier is used is smaller than the predetermined size of the room, the air purifier will be operated for longer than necessary.

(2) If the size of the room in which the air purifier is used is larger than the predetermined size of the room, the air purifier will stop before sufficient purification is performed.

(d) Means for Solving the Problems This invention provides a gas sensor, a means for starting the operation of an air purifier from an increase in concentration detected by the gas sensor output, and a time period of the gas sensor output when the air purifier is operating. a detection means for detecting that the physical change is saturated;
A timer means for stopping the operation of the air purifier after a predetermined set time after the saturation of the temporal change in the gas sensor output is detected, and setting of the timer means according to the size of the room in which the air purifier is used. This is a control device for an air purifier provided with means for changing the time.

(E) Since the setting time of the timer can be adjusted using the action setting means, the timer can be set to a time corresponding to the size of the room in which the air purifier is used, and the air purifier can be operated. There will be no excess or deficiency of time depending on the size of the room.

(f) Examples The present invention will now be described in detail based on examples shown in the drawings. This invention is not limited by this.

FIG. 1 is a block diagram showing one embodiment of the present invention,
1 is a control unit equipped with a microcomputer; 2 is a part of a gas sensor that uses a sensor whose electrical resistance value decreases as the gas concentration increases, converts the change in resistance caused by the sensor into a change in DC voltage, and outputs the result; 3 is a sensor constant voltage section that supplies a constant voltage to the gas sensor part 2; 4 is a heater constant voltage section that supplies a constant voltage to the heater of the gas sensor; 5
6 is a gas concentration detection unit that converts the analog output of the gas sensor part 2 into a digital value and inputs it to the control unit 1, and 6 is a sensitivity setting/detection unit that sets the gas detection sensitivity with a volume and converts the set value into a digital value. , 7 is an operating time setting section equipped with a sliding volume that can arbitrarily set the timing setting time of an operating time timer built into the control section l; 8 is a power supply section that supplies power to each circuit; 9 1 is a constant voltage unit that converts the power supply voltage supplied from the power supply unit 8 into a constant voltage, 10 is a key power unit equipped with switches for various operations, 11 is an oscillation unit that supplies a system clock to the control unit l, and 12 is a A high voltage generation part for electrostatic precipitator and anion generation of an air purifier (not shown); 13 is a control part! 14 is a fan motor that rotates an electrostatic dust collection fan provided in the air cleaner; 15 is a fan motor 14; 16 is an LED display section that displays the fan's air volume; 17 is an LED that displays various operating states of the air purifier.
D display section 18 is a buzzer that emits a confirmation sound for the switch of the key manual section 1O and other sounds.

Next, the operation of the control device shown in FIG. 1 will be explained using the flowchart shown in FIG. First, in step 201, the reference resistance value RIIl of the sensor of the gas sensor part 2 is
ax is read, and then the operating time T0, which is set according to the size of the room in the operating time setting section 7, is read (
Step 202). Next, the gas sensor resistance Rs of the gas sensor part 2 is read (step 203), and the ratio to the reference value Riax, Rs/Rsax, is calculated. When the value exceeds the value (step 204), the fan motor 14
and the high voltage generator 12 is driven (step 205).
, the air purifier starts its operation. Subsequently, the sensor resistance Rs of the gas sensor part 2 is read at predetermined intervals (step 206), and when there is no difference between these read values and the gas concentration is saturated (step 207).
, a timer built in the control unit i sets a time T. starts counting time (step 208).

Furthermore, the sensor resistance Rs is subsequently read (step 209), and the ratio to the reference value Rwax, Rs/Rma
When x becomes (a + 0.05) or more and the gas concentration decreases by a predetermined value from the saturation value (step 21O), the drive of the fan motor 14 and the high voltage generator 12 is stopped (
Step 211). Further, even if there is no change in the read value of the sensor resistance Rs, when the timer finishes counting the time T0 (step 21.2), the drive of the fan motor 14 and the high voltage generator 12 is stopped (step 211).
), the air purifier will stop operating.

To explain the above operation in relation to gas concentration and dust concentration, as shown in Figure 3, when the gas concentration increases above a predetermined value, the air purifier is activated, and then the dust concentration decreases and the degree of However, if it is determined from the change in gas concentration, that is, if the gas concentration decreases by a predetermined value from the maximum value and the dust concentration is deemed to have decreased sufficiently,
At that point, the operation of the air cleaner is stopped (the air cleaner is operated for a time T).

In addition, as shown in Figure 4, start the air purifier when the gas concentration exceeds a predetermined value, and if the gas concentration does not decrease even if the dust concentration decreases, depending on the size of the room. The set time T. Only run the air purifier.

In this way, the air purifier will be operated in excess or insufficient quantity, and the dust in the room will be properly purified.

If the sliding volume of the operating time setting section 7 is calibrated with, for example, the floor area or the number of tatami mats, the operating time can be easily set using that as a guide. Further, the rotation speed of the fan motor 14 may be changed depending on the size of the room, such that the rotation speed is high when the room is large and low when the room is small. In this embodiment, the operating time is set manually by the user, but an appropriate sensor is used to detect the size of the room and the operating time is automatically set. You can.

(g) Effects of the Invention According to this invention, the operating time of the air purifier is set according to the size of the room in which the air purifier is used, so the air purifier is not operated for a longer time than necessary. The vehicle is operated efficiently without any problems or lack of operating time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of FIG. 1, and FIGS.
The figure is a graph showing the gas concentration and dust concentration when the air cleaner of the present invention is used. Figure 2 1...Microcomputer, 2...
Sensor part, 7... Operating time setting part, 12
...High voltage generator, 14...Fan motor.

Claims (1)

[Claims] 1. A gas sensor; A means for starting the operation of an air cleaner from an increase in the output of the gas sensor; A means for detecting that the temporal change in the output of the gas sensor during operation of the air cleaner is saturated; a detection means, a timer means for stopping the operation of the air purifier after a predetermined set time after the saturation of the temporal change in the gas sensor output is detected; A control device for an air purifier, comprising: a setting means for changing the set time of the timer means.