JPH0362464B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air cleaner having a function of detecting dirt in indoor air using a gas sensor and automatically operating the air cleaner.

BACKGROUND ART The general configuration of a conventional air cleaner of this type will be described below with reference to the drawings.

4, 5, and 6, the main body 1 has an electric blower 2 built in, and the air taken in from the intake port 3 on the front passes through a prefilter 4, and is passed through a counter electrode 5 and a discharge wire 6. After being ionized and having dust adsorbed by a filter 7, it is discharged from an exhaust port 8. A remote control case 9 detachably attached to the upper part of the main body 1 includes an operation switch 10 and a display section 11.
It also has a built-in gas sensor 12 for detecting whether the indoor air is contaminated. When the operation is set to automatic mode by the operation switch 10, the output of the gas sensor 12 is detected by the detection circuit 13.
is input, this is judged by the control circuit 16 connected to the power supply 14 and the operation circuit 15, and the power supply 1 supplies voltage between the electric blower 2, the counter electrode 5, and the discharge wire 6.
4 and display circuit 17. In other words, it automatically turns on when it detects dirt in the room and turns off when the room is clean. Note that 18 is a power cord.

Problems to be Solved by the Invention In such conventional air purifiers with an automatic operation function, the gas sensor 12 does not only react to indoor dirt (for example, cigarette smoke);
For example, it responds to human breath. There has been a problem in that when a user intentionally blows into the gas sensor 12, the gas sensor 12 is activated and the air cleaner is operated even though the air in the room is not contaminated.

The present invention solves these problems,
The aim is to provide an air purifier that is less likely to malfunction.

Means for Solving the Problems In order to solve the above problems, the present invention includes a gas sensor that detects the degree of pollution of indoor air, and a control circuit that automatically operates the main body according to the output of this sensor. a timer means for starting time measurement when the gas sensor output becomes equal to or less than the reference level again after the gas sensor output exceeds a value obtained by adding a predetermined value to a set reference level and the main body starts operating; The timer means determines whether or not to continue operating the main body based on the output of the gas sensor when a predetermined time has elapsed.

Function The air purifier of the present invention has the above-described configuration, so that when the user intentionally blows into the gas sensor, the output of the gas sensor increases to a value equal to or higher than the reference level plus a predetermined value. Even if the main unit starts operating, the output of the gas sensor returns to around the reference level after you stop blowing, which is used to stop the main unit from operating, resulting in efficient and efficient automatic operation. It is possible.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The basic configuration of the air cleaner itself is the same as the conventional one, so the explanation will focus on the differences from the conventional example.

In FIG. 1, air is taken in from an intake port 20 provided on the front surface of the main body 19 through an exhaust port 20 on the top surface.
It adsorbs dust in the flow path. An electric blower 31 that generates airflow is built into the main body 19 and arranged in a flow path between the filter 22 and the exhaust port 21. This electric blower 31
is the manual switch 2 provided on the remote control unit 23.
4, the indicator light 25 is turned on.

The main body 19 also includes a control circuit 28 that performs automatic operation according to the output of the gas sensor 26 when the manual switch 24 is set to the automatic operation position. 27 is a power cord.

To explain the circuit system with reference to Fig. 2, the power supply 32
A control circuit 28 connected to the manual switch 24
The electric blower 31 is driven by receiving a signal from the operation unit 33 including the
When this value becomes equal to or greater than the value obtained by adding a predetermined value to the reference level stored in the control circuit 28, the control circuit 28 automatically operates the electric blower 31. The timer means 30 is
Timing is started when the output of the gas sensor 26 via the detection device 29 falls below the reference level during automatic operation. The determining means 34 is the timer means 3
It is determined whether or not to continue operating the main body based on the output of the gas sensor 26 via the detection device 29 when the clock reaches 0.

The operation in the above configuration will be explained. FIG. 3 shows how the output of the gas sensor 26 changes. When the power supply 32 of the air cleaner is applied, the output of the gas sensor 26 changes as shown in E. The output of the gas sensor 26 becomes stable approximately 5 minutes after the power supply 32 is applied. During this time, even if automatic operation is set, input from the gas sensor 26 is prohibited, so the control circuit 28 controls the electric blower 31.
never works. Point D, which is 5 minutes after the power supply 32 is applied, is stored in the control circuit 28 using the output of the gas sensor 26 as a reference level.

When the user blows into the gas sensor 26, the output of the gas sensor 26 increases, and when it rises by a predetermined value or more above the reference level stored in the control circuit 28 (point A). When automatic operation is set, the control circuit 28 operates the electric blower 31. However, the output of the gas sensor 26 is
It immediately begins to drop and eventually falls below the standard level (point B). This is because the output of the gas sensor 26 temporarily decreases due to the flow of wind due to the operation of the electric blower 31.The timer means 30 starts counting time from point B, and after the 5-minute time has finished, the control circuit 28 outputs the output from the gas sensor 26. The detection circuit 29 detects the output of
Import via . At this point, the electric blower 31 is still operating.

Next, the determining means 34 determines whether to continue or stop the operation of the electric blower 31 based on the output of the gas sensor 26 at this point. In other words, when the main unit operates by blowing, the output of the gas sensor 26 returns to around the reference level as shown at point C, so the determining means 34 determines that the blowing caused a malfunction, and the control circuit 28 determines that the electric blower 31 is canceled. However, if the air in the room becomes dirty and the output of the gas sensor 26 rises to point A in FIG. Sometimes, the electric blower 31 rises to point F again and the operation of the electric blower 31 does not stop.

Effects of the Invention As described above, according to the present invention, even if the user blows into the gas sensor and the main unit operates, the change in the output of the gas sensor is detected, and the air becomes contaminated and the main unit operates. If the main unit operates due to the former reason, the main unit can be stopped in a short period of time.
It is possible to obtain an air cleaner having a good automatic operation function with few malfunctions.

[Brief explanation of drawings]

Fig. 1 is an external perspective view of an air purifier according to an embodiment of the present invention, Fig. 2 is a block diagram of the same circuit, Fig. 3 is a diagram of output changes of a gas sensor, and Fig. 4 is a diagram of a conventional air purifier. 5 is a block diagram of the same circuit, and FIG. 6 is a sectional view of the same side. 19...Main body, 26...Gas sensor, 28...
...Control circuit, 29...Detection device, 30...Timer means, 31...Electric blower, 34...Judgment means.

Claims (1)

[Claims] 1. It has a gas sensor that detects the degree of pollution of the indoor air and a control circuit that automatically operates the main unit according to the output of this sensor, and the gas sensor output has a value that is a predetermined value added to the set reference level. After the main unit starts operating, there is a timer means that starts measuring when the gas sensor output becomes below the reference level again, and a timer means that starts measuring the time when the gas sensor output falls below the reference level again, and An air purifier comprising a judgment means for determining whether or not to continue operating the main body.