JPH01194920A - Air cleaner - Google Patents

Abstract

PURPOSE:To allow a smoke sensor to be surely actuated when a person is present by providing an infrared-ray sensor to an air cleaner whose drive is controlled by the smoke sensor of tobacco. CONSTITUTION:An air cleaner consists of a blowing part 5, an air filter 6, an infrared-ray sensing means 1, a smoke concentration measuring means 2 and a drive start deciding means 3. When the smoke concentration of tobacco sensed by the measuring means 2 is reached to preset value, the drive start deciding means 3 outputs a single to a blowing part driving means 4. Further when absence of a person is sensed by the infrared-ray sensing means, this preset value is highly preset. Therefore the air cleaner can be prevented from malfunctioning by the foreign effect other than the smoke of tobacco in the case of the absence of a person.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air cleaner having an automatic operation function.

Conventional technology Air purifiers use sensors to detect cigarette smoke.
Some vehicles have the ability to perform autonomous driving. This type of air purifier is equipped with a gas sensor that measures smoke concentration.
An air purifier that detects cyclic gases such as carbon monoxide contained in cigarette smoke and operates the air purifier when it is determined that the cigarette smoke concentration has reached a certain value based on the output signal of the gas sensor. Met.

Problems to be Solved by the Invention However, in such a conventional configuration, the cyclic gas generated by the combustion of cigarettes diffuses into the room.
Gas sensors must detect very low concentrations of gas, but if the sensitivity of the gas sensor is made too high, it will be affected by factors other than gas, such as changes in temperature, humidity, and fluctuations in power supply voltage. Since the air purifier outputs the same output signal as when it detects gas, there is a problem in that the air purifier is more likely to operate due to external influences other than the amount of cigarette smoke.

Another problem is that if the sensitivity of the gas sensor is set too low, the gas sensor will not be able to detect it unless a large amount of cigarette is burned.

The present invention solves these problems by providing an air purifier that operates reliably against cigarette smoke when people are present, and is less likely to operate due to external influences other than cigarette smoke when people are not present. The purpose is to provide the following.

Means for Solving the Problems In order to solve the problems, the present invention includes an air blower, an air filter, an infrared detection means for detecting infrared rays emitted from a human body, and a smoke density measurement device for measuring cigarette smoke density. means, drive start determining means for outputting a signal to the blower drive means when a signal sent from the smoke concentration measuring means exceeds a set value, and a blower for driving the blower by a signal from the drive start deciding means. The driving start determining means increases the set value when the infrared detecting means detects that no one is present.

Effect: With this configuration, when the infrared detection means detects that there is a person in the room, the reference level of smoke concentration that determines the start of operation of the ventilation section is set to a lower concentration than when there is no person. This allows the air purifier to operate reliably even at low levels of smoke concentration.

Example An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram of an air cleaner according to an embodiment of the present invention. Since the human body temperature is 36 to 37°C, the human body emits infrared rays with a peak wavelength of 9 to 10 μm. The infrared detection means 1 can detect the presence of a human by selectively detecting infrared rays having a peak wavelength of 9 to 10 μm.

On the other hand, the smoke concentration measuring means 2 can measure the tobacco smoke concentration by measuring the concentration of cyclic gas in the air generated by burning tobacco.

The drive start determining means 3 constantly monitors the signals from the infrared detecting means 1 and the smoke concentration measuring means 2, sends a signal to the blower driving means 4 as necessary, and drives the blower 5 to start the air. Air is passed through the filter 6 to purify the air.

In the above configuration, FIG. 2 is a graph in which the vertical axis shows the concentration of cigarette smoke in the air measured by the smoke concentration measuring means 2, and the horizontal axis shows the elapsed time. When cigarettes are burned, the concentration of cigarette smoke increases.

If no person is present, the infrared detection means 1 shown in FIG. 1 does not detect the person. Even when no one is present, the output signal of the smoke concentration measuring means 2 may increase due to changes in temperature or humidity, or fluctuations in power supply voltage, etc. In this case,
Since the infrared detecting means 1 does not detect a person, the blower is not driven unless the smoke concentration reaches the blower drive start smoke density 7 when a person is not detected.

On the other hand, if a person is present, the infrared detection means 1 shown in FIG. 1 detects the person. When a person is detected, the smoke density is set lower than when no person is detected. The blower is driven when the smoke density reaches 8, which is the start of driving the blower when a person is detected.

Effects of the Invention As described above, according to the present invention, by setting a high cigarette smoke concentration to start operating the air purifier when no one is present, the air purifier is activated by external influences other than cigarette smoke. can reduce the possibility that it will work. Further, if there are people present, by setting the cigarette smoke concentration at which the air purifier starts operating to be low, a response to cigarette smoke can be quickly and reliably performed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an air cleaner according to an embodiment of the present invention, and FIG. 2 is a waveform diagram of an output signal of the smoke concentration measuring means. 1...Infrared detection means, 2...Smoke concentration measuring means, 3...Drive start determining means, 4...
...Blower section driving means, 5...Blower section, 6...
...Air filter, 7...Smoke concentration at the start of blower drive when no person is detected, 8...Smoke concentration at the start of blower drive when a person is detected.

Claims (1)

[Claims] an air blower, an air filter, an infrared detection means for detecting infrared rays emitted from a human body, a smoke concentration measurement means for measuring cigarette smoke concentration, and when a signal sent from the smoke concentration measurement means exceeds a set value; The driving start determining means outputs a signal to the blowing unit driving means, and the blowing unit driving means drives the blowing unit in accordance with the signal from the driving start determining means, and the driving start determining means uses the infrared detecting means to detect whether a person is present. An air purifier that increases the setting value if it detects that there is no air purifier.