JPH0362463B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air purifier that has a function of automatically operating by detecting dirt in indoor air using a sensor.

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

In FIGS. 2, 3, and 4, a main body 1 has an electric blower 2 built in, and air taken in from an intake port 3 on the front side passes through a prefilter 4, and is passed through a counter electrode 5 and a discharge wire 6. After being ionized and adsorbing dust 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 has a built-in gas sensor 12 for detecting the degree of pollution of the indoor air, and when the operation is set to automatic mode, the output of the gas sensor 12 is detected by the detection circuit 13, and this is sent to the power supply 14. The control circuit 16 connected to the operation circuit 15 determines this, and controls the electric blower 2, the voltage power source 15 that supplies voltage between the counter electrode 5, and the discharge line 6, and the display circuit 17.
It operated automatically by turning on the light when it detected dirt in the room and turning off when the room was clean. Note that 18 is a power cord.

Problems to be Solved by the Invention Air purifiers with an automatic operation function using such gas sensors are mainly used for air purification during smoking, etc., when igniting a cigarette and starting smoking. After that, the smoke particles and gas components generated from the cigarette diffuse into the room, and after reaching the gas sensor, the output signal causes the device to operate, but the smoke particles and gas components that touch the sensor vary in time and level. However, due to the lack of stability, there was a problem in that the sensor output also fluctuated over time. Moreover, the output becomes unstable due to fluctuations in power supply voltage due to people passing by, air movement caused by other air conditioners, etc., or short power outages, resulting in malfunctions.

The present invention solves these problems,
The aim is to provide an air purifier that is highly usable.

Means for Solving the Problems In order to solve the above problems, the present invention adopts a configuration that includes an averaging circuit and an input prohibition circuit between the output of the gas sensor and the control circuit that performs automatic operation. This is what I did.

Effects The present invention, with the above-described configuration, averages the output voltage of the gas sensor over time and automatically operates by prohibiting input of erroneous signals to the control circuit, thereby reducing smoke particles and gas components. Eliminates output instability caused by unstable input to the sensor, air movement due to people passing by, other air conditioners, etc., and fluctuations in power supply voltage due to short-term power outages, etc., and is highly usable without malfunction. It is capable of autonomous driving.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The specific configuration of the air purifier is the same as the conventional example shown in Figs. 2 and 3, so
The explanation will be omitted and the circuit system will be explained based on FIG. Control circuit 30 connected to power supply 29
obtains a signal from the operating circuit 31 including the switch 10, drives the electric blower 2, detects smoke from the cigarette 35 with the gas sensor 12, and outputs the output when the automatic operation is set. The detection circuit 3
3. Input to the control circuit 30 via the input prohibition circuit 36 and the averaging circuit 37, and control circuit 30 according to the input.
automatically operates the electric blower 2. Control circuit 30
The system compares the output value of the gas sensor 12 with an operating reference level and performs automatic operation when the output value changes by a certain value or more. A power outage detection circuit 34 is also connected to the power supply 29, and its output is connected to an input prohibition circuit 36. When a power outage occurs, the output signal of the detection circuit 33 is sent to an averaging circuit 37. It operates to prohibit the input of . The averaging circuit 37 averages the values every 4 seconds eight times, for example, and uses this value as an input signal to the control circuit 30 to smooth out instability caused by various factors in the output of the gas sensor 12, thereby preventing malfunctions. can be suppressed.

In the above, the averaging circuit 37 and the input inhibiting circuit 36 have been described as separate circuits in the embodiment.
It is clear that the same purpose can be achieved using microcomputer software.

Effects of the Invention As described above, according to the present invention, by using the input inhibiting circuit and the averaging circuit, the gas sensor can eliminate fluctuations and prevent malfunctions from unstable output signals caused by various factors. This makes it possible to obtain an air purifier with good usability.

[Brief explanation of drawings]

Fig. 1 is a circuit block diagram of an air purifier according to an embodiment of the present invention, Fig. 2 is an external perspective view of the air purifier, Fig. 3 is a side sectional view of the same, and Fig. 4 is a diagram of a conventional air purifier. FIG. 3 is a circuit block diagram. 2...Electric blower, 12...Gas sensor, 3
0...Control circuit, 33...Detection circuit, 34...Power failure detection circuit, 36...Input prohibition circuit, 37...Averaging circuit.

Claims (1)

[Claims] 1. A gas sensor that detects the degree of indoor air pollution, a control circuit that compares the output value of the gas sensor with an operating reference level, and performs automatic operation when the change exceeds a certain value, and a control circuit that detects the output signal of the gas sensor. An averaging circuit that averages the signal and uses it as an input signal to the control circuit, and in the event of a short power outage, prohibits input of the output signal from the gas sensor to the control circuit that performs automatic operation for a certain period of time. An air purifier having an input prohibition circuit.