JPH04298210A - Air cleaner - Google Patents

Abstract

PURPOSE:To maintain the air in a room always in a clean state by early detecting the generation amt. of dust and controlling the rotating speed of a fan and to prevent the rotating noise of the fan from disturbing people when they keep quiet. CONSTITUTION:The rotating speed of the fan 4 is controlled to vary the suction quantity of the polluted air passing through a filter 5 by using an activity sensor 8 which detects the number of persons to be a measure for the generation amt. of the dust in the room and the motion thereof and a rotating speed controller which varies the rotating speed according to the activity of the persons detected by this activity sensor 8.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cleaner that collects indoor dust and maintains the indoor air in a clean state.

0002

4 is a block diagram showing an example of a conventional air cleaner. In the figure, 1 is an optical or mass type dust sensor, 2 is a dust sensor 1 that detects the amount of dust, and a motor 3 A motor speed control device for controlling the number of rotations; 4 is a fan attached to the rotating shaft of the motor 3; and 5 is a mechanical or electronic filter.

This air cleaner detects dust straying indoors using a dust sensor 1, controls the rotational speed of a motor 3 via a motor speed control device 2, and adsorbs the dirty indoor air onto a filter 5. It is designed to purify the air.

FIG. 5 is a block diagram showing another example of a conventional air cleaner. In the figure, 6 is an infrared sensor that detects the presence or absence of dust and drives the motor speed control device 2, and the other configuration is shown in FIG. Similarly, when the infrared sensor 6 detects dust, the motor speed control device 2 controls the rotational speed of the motor 3 in two stages to make the indoor dirty air adsorbed to the filter 5 to purify the indoor air. This is how it was done.

FIG. 6 is a block diagram showing still another example of a conventional air cleaner. In the figure, 7 is a crowding sensor for counting the number of people by adding a scanning mechanism to an infrared sensor, and the other configuration is as shown in FIG. Similarly, when the congestion level sensor 7 detects dust, the motor speed control device 2 controls the rotational speed of the motor 3 in multiple stages so that the dirty air in the room is adsorbed by the filter 5. .

[0006]

[Problems to be Solved by the Invention] Since the conventional air cleaner is constructed as described above, in the air cleaner shown in FIG. 4, it takes some time for the dust generated by humans to drift to the dust sensor 1, and during this time, It is unsanitary because the room is filled with dust. In addition, the dust sensor 1 has a problem in that, in principle, if dust adheres to it, the detection performance deteriorates, so regular maintenance is required.

Therefore, the dust detection time delay and the dust sensor 1
In order to reduce the complexity of maintenance, there is a method that uses the infrared sensor 6 shown in Fig. 5 to detect the presence of a human being, which is a source of indoor dust. There is a problem in that the rotational speed of the motor 3 can only be controlled in two stages: strong and weak or on/off.

Furthermore, although the air cleaner shown in FIG. 6 allows the rotational speed of the motor to be controlled in multiple stages, more dust is generated when people are present and these people are moving. In other words, when there are many people in a library or classroom, but they are not moving, the amount of dust generated is relatively small, and if the rotation speed of the motor 3 is increased only in response to the number of people, the operating noise will increase. There was a problem.

[0009] This invention was made to solve the above-mentioned problems, and it quickly detects the amount of dust generated and controls the rotation speed of the fan to keep the indoor air clean at all times. Another object of the present invention is to obtain an air cleaner in which the rotation noise of the fan does not become a nuisance when people are quiet.

0010

[Means for Solving the Problems] An air cleaner according to the present invention includes an activity sensor that detects the number of people and their movements, which serve as a guideline for the amount of dust generated in a room, and a sensor that detects the number of people and their movements. a rotation speed control device that varies the rotation speed, a fan whose rotation is controlled by the rotation speed control device to vary the suction amount of dirty air, and a filter installed near the fan to purify the dirty air. It depends on this.

[0011]

[Operation] The air cleaner according to the present invention detects the number of people and their level of activity using an activity level sensor, and varies the suction amount of dirty air passing through the filter depending on the magnitude of the signal from this level of activity sensor. It is.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of this invention.
In FIG. 1, the same or equivalent components as those in FIG. 4 are given the same reference numerals, and redundant explanation will be omitted. In the figure, 8 is an activity sensor that detects the number of people and their movements, which is the total amount of human activity. A common electrode 10 formed of a conductive film, a PIN type amorphous silicon layer 11 laminated on this common electrode 10, and an aluminum film or the like formed on this PIN type amorphous silicon layer 11 opposite to the common electrode 10. A counter electrode 12 with a comb-shaped structure that also has a spatial filter function is formed.
It is made up of. Further, the counter electrode 12 includes a first comb-shaped electrode 12a and a second comb-shaped electrode 12 which are symmetrical to each other.
b are combined with each other at equal pitch intervals. The configuration other than the activity sensor 8 is the same as the conventional one.

FIG. 3 shows a block diagram of the signal processing circuit of the activity sensor. In the figure, 13 is a differential amplifier, 14 is a band pass filter, 15 is a window comparator, and 16 is a timer.

Next, the operation will be explained. Differential amplifier 1
When the outputs of the first comb-shaped electrode 12a and the second comb-shaped electrode 12b are inputted to No. 3, the difference between the outputs is taken and amplified. Here, when the dust projected onto the activity sensor 8 moves by 2×(electrode width P1 + inter-electrode width P2), it causes a one-cycle brightness change, which is converted into an electrical signal by the activity sensor 8. Note that the frequency of this electric signal is determined by the moving speed of the dust to be detected. This electrical signal is input to a bandpass filter 14, which passes the signal frequency of the moving dust to be detected. The window comparator 15 outputs a signal to the timer 16 when this signal change exceeds the threshold voltage, and this output signal is output to the timer 1.
6, it is held for a certain period of time and is output.

That is, the activity sensor 8 detects the amount of dust floating in the room as soon as possible, and controls the rotational speed of the motor 3 to a higher speed via the motor speed control device 2, thereby reducing the amount of dirty air in the room. is adsorbed onto the filter 5 to quickly purify the indoor air. Also,
When a person is quiet, the rotation of the motor 3 is weakened so that the rotation noise does not become a nuisance.

[0016]

[Effects of the Invention] As described above, according to the present invention, an air cleaner includes an activity sensor that detects the number of people and their movements, which are indicators of the amount of dust generated in a room, and The fan's rotational speed is controlled using a rotational speed control device that varies the rotational speed accordingly, and the amount of dirty air sucked through the filter is varied, so the amount of dust generated can be detected quickly. This has the effect of controlling the rotation speed of the fan to keep the air in the room clean at all times, and that the fan rotation noise does not become a nuisance when people are quiet.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an air cleaner according to an embodiment of the present invention.

FIG. 2 is an enlarged side view of an example of an activity sensor.

FIG. 3 is a block diagram showing a signal processing circuit of an activity sensor.

FIG. 4 is a block diagram showing an example of a conventional air cleaner.

FIG. 5 is a block diagram showing another example of a conventional air cleaner.

FIG. 6 is a block diagram showing still another example of a conventional air cleaner.

[Explanation of symbols]

2 Motor speed control device 4 Fan 5 Filter 8 Activity sensor

Claims (1)

[Claims] [Claim 1] An activity sensor that detects the number of people and their movements, which serve as a guide to the amount of dust generated in a room, and a rotation speed control device that varies the rotation speed according to the degree of human activity detected by the activity sensor. and a fan whose rotation is controlled by this rotation speed control device and whose suction amount of dirty air is varied.
An air cleaner that is installed near this fan and includes a filter that cleans dirty air.