JPH01245825A - Air cleaner - Google Patents

Abstract

PURPOSE:To prevent an air cleaner from malfunctioning by external effect excepting the smoke of tobacco by highly presetting the smoke concn. of tobacco by which the air cleaner starts to be operated when a person is absent. CONSTITUTION:Since a man sensing decision means 3 does not output a man sensing signal when a person is absent, a blast part 7 is not driven when the smoke concn. does not reach the smoke concentration 9 for starting to drive the blast part in the case of unsensing a person. On the other hand, when the person is preset, the decision means 3 utilized with supersonic pulse senses the person and outputs a signal. The smoke concentration 10 for starting to drive the blast part in the case of sensing the person is preset at low concentration in comparison with the case of unsensing the person and the blast part 7 is driven at a point of time when the smoke concn. reaches the smoke concn. 10 in the case of sensing the person. In such a way, response to tobacco smoke is made rapid and sure by presetting the smoke concn. of tobacco low when a person is present.

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 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, a transmitter that emits ultrasonic waves, and an ultrasonic wave that is emitted from the transmitter and reflected back to an object. a receiver for receiving reflected waves received by the receiver, and a person detection determination means for determining whether there is a person within a detection area based on a change in the reflected waves received by the receiver;
a smoke concentration measuring means for measuring cigarette smoke concentration; a drive start determining means for outputting a signal to the blower driving means when a signal sent from the smoke concentration measuring means exceeds a set value; The air blowing unit driving means is provided for driving the air blowing unit in response to a signal, and the drive start determining means is configured to increase a set value when the human detection determining means detects that no one is present.

Effect: With this configuration, when the human detection judgment means detects that there is a person within the detection area, the standard level of smoke concentration for determining the start of operation of the ventilation section is set to a low concentration even when no person is present. This allows the air purifier to operate reliably even at low smoke concentrations.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings. In FIG. 1, an ultrasonic pulse is emitted into space from a transmitter 1, and the reflected wave pulse reflected from an object and returned is received by a receiver 2. The human detection determination means 3 determines whether the reflected wave pulse received by the receiver 2 is within the detection area based on changes in the time from when it is emitted from the transmitter 1 until it is received by the receiver 2, changes in level, etc. It is possible to detect whether someone has entered the room.

On the other hand, the smoke concentration measuring means 4 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 6 constantly monitors the signals from the human detection determining means 3 and the smoke concentration measuring means 4, and sends a signal to the blower driving means 6 to drive the blower 7 as necessary. Air is passed through an air filter 8 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 density measuring means 4, and the horizontal axis shows the elapsed time. When cigarettes are burned, the concentration of cigarette smoke increases.

If there is no person present, the person detection/judgment means 3 shown in FIG. 1 does not output a signal indicating that a person has been detected. Even when no one is present, the output signal of the smoke concentration measuring means 4 may increase due to changes in temperature, humidity, or fluctuations in power supply voltage, but in this case, the human detection/determination means 3 does not detect a person. Therefore, the blower will not be driven unless the smoke concentration reaches smoke density 9, which is the start of driving the blower when no person is detected.

On the other hand, if a person is present, the person detection/judgment means 3 shown in FIG. 1 detects the person and issues a signal. The smoke concentration 1o at the start of blower drive when a person is detected is also set to a low concentration when no person is detected. The blower is driven when the smoke density reaches 10, 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, the air purifier starts operating when no one is present. By setting the cigarette smoke concentration high, the air purifier is activated by external influences other than cigarette smoke. can prevent malfunction. Furthermore, 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... Transmitter, 2... Receiver, 3...
...Human detection determination means, 4...Smoke density measurement means, 6...Drive start determining means, 6...
Blowing unit driving means, 7...Blowing unit, 8...
・Air filter. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
-Ikko 5 Tomofuyu 7-Minami total figure 2

Claims (1)

[Claims] an air blower, an air filter, a transmitter that emits ultrasonic waves, a receiver that receives the reflected waves emitted from the transmitter, reflected by an object, and returned to the object; a human detection/judgment means for determining whether there is a person in the detection area based on changes in reflected waves; a smoke concentration measuring means for measuring cigarette smoke concentration; and a signal sent from the smoke concentration measuring means exceeding 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 detects a person by the human detection determining means. An air purifier that increases the setting value if it detects that no one is present.