JPH0427909B2 - - 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 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 the filter 7, it is discharged from the exhaust port 8. A remote control case 9 detachably attached to the upper part of the main body 1 is provided with an operation switch 10 and a display section 11, and has a built-in gas sensor 12 for detecting that indoor air is contaminated. When operation is set to automatic mode by the operation switch 10, the output of the gas sensor 12 is input to the detection circuit 13, and this input signal is judged by the control circuit 16 connected to the power supply 14 and the operation circuit 15. 2, a power source 14 that supplies voltage between the counter electrode 5 and the discharge line 6, and a 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 Such conventional air purifiers with an automatic operation function have the disadvantage that it takes time to start operation because only the gas sensor 12 is used as a sensor. It is. In other words, in the case of air purification during smoking, which is the main use of air purifiers, after the cigarette is ignited and smoking begins, the smoke particles and gas components generated from the cigarette are diffused into the room. However, there is a problem in that a waiting time is physically necessary because the device does not start operating until it reaches the gas sensor 12. In addition, many common gas sensors have a heater part in their configuration, and after turning on the power, it takes several minutes for the temperature of the heater part to stabilize and stable output to be obtained. Waiting time is also required,
During this time, there was a problem that automatic operation using gas sensor output was not possible.

The present invention solves these problems,
The purpose of the present invention is to provide a highly usable and safe air purifier that utilizes a sensor that responds quickly.

Means for Solving the Problems In order to solve the above problems, the present invention includes an ultraviolet sensor and a control circuit that automatically operates the equipment based on the output thereof, and both ends of the ultraviolet sensor are connected to a power source. , a parallel circuit of a capacitor and a resistor, and the other end is connected in series with a resistor.

Effects The present invention has the above-described configuration, and the flame of a lighter, a matchstick, etc. can be immediately detected by an ultraviolet sensor at the time of starting smoking, and automatic operation can be started. The UV sensor is used with the glass tube exposed to the outside, so even if the glass part of the ultraviolet sensor breaks and someone touches the electrode part, the current flowing through the human body can be kept to a small level, so it has a good structure in terms of safety. 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 taken in through an intake port 20 provided on the front surface of the main body 19 is discharged from an exhaust port 21 on the top surface, and a filter 22 provided in the flow path adsorbs dust in the inhaled air. It is something to do. An electric blower 32 that generates airflow is installed in the main body 1
9 and arranged in the flow path between the filter 22 and the exhaust port 21. This electric blower 32 is also driven by operating a manual switch 24 provided on the remote controller 23, and the indicator light 25 lights up. The remote controller 23 also has a built-in control circuit that performs automatic operation according to the outputs from the gas sensor 26 and the ultraviolet sensor 27 when the manual switch 24 is set to the automatic operation position. UV sensor 2
7 is used with its glass tube exposed to the outside from the main body 19, and is provided on the front surface of the main body 19. 28 is a power cord.

To explain the circuit system with reference to Figure 2, the power supply 29
A control circuit 30 connected to the switch 24
The electric blower 32 is driven by obtaining a signal from the operation circuit 31 including the above, and when automatic operation is set, the output from the gas sensor 26 is inputted to the control circuit 30 via the detection circuit 33. Similarly, the output from the ultraviolet sensor 27 is input to the control circuit 30 via the detection circuit 34. The control circuit 30 automatically operates the electric blower 32 according to each input. Here, the gas sensor 26 mainly detects smoke and gas components of the cigarette 35 during smoking, and the ultraviolet sensor 27 detects the lighter 35 for igniting the cigarette 35.
It detects ultraviolet rays emitted from fires such as fire and pine.

In Fig. 3, a partial circuit is explained as follows.
The power supply 29 is boosted by a transformer T, and a diode _D1
The circuit configuration is such that the charge is rectified by the capacitor _C0 , smoothed by the capacitor C0, and the charge is stored in the capacitor _C1 via the resistor _R1 . A UV sensor ₂₇ , a parallel circuit of a capacitor C ₂ and a resistor R ₂ , and a circuit in which a parallel circuit of a capacitor C ₃ and a resistor R ₃ are connected in series are connected to both ends of the capacitor C 1 in parallel.
The control circuit ₃ controls the potential _V0 generated across the resistor R3.
0 or output to the detection circuit 34.

To explain the operation in the above configuration, when the switch 24 is pressed to switch to automatic operation and ignite the lighter 36 to start smoking, the ultraviolet sensor 27 immediately operates and sends a signal to the control circuit 30 via the detection circuit 34. is input, and the electric blower 32 starts operating. At the same time, the display section 25 of the remote control section 23 displays the operating status. Next, after starting smoking, the gas component of the smoke from the cigarette 35 is detected by the operation of the gas sensor 26, and the operation is continued based on a signal input to the control circuit 30 via the detection circuit 33.
Here, the ultraviolet sensor 27 needs to be installed outward from the main body 19, but the ultraviolet sensor 27
The discharge tube 7 is generally made of a glass bulb, and must be made of a material with high ultraviolet transmittance, such as quartz glass, and it is difficult to provide a protective cover or the like. Therefore, there is a risk that the electrode will be exposed if it breaks, but the resistor _R1 should be 10MΩ, the capacitor _C1 should be 220PF, the resistor _R2 should be 1MΩ, and the capacitor _C2 should be
If 0.022μF and C ₃ are 1000PF, the anode A of the ultraviolet sensor 27 should be 5MΩ or more with respect to the commercial power supply.
The cathode has an impedance of 100KΩ or more, which prevents the risk of electric shock. At this time, since the detection pulse generated by the ultraviolet sensor 27 is a pulse of about 10 μsec, the output V ₀ has an impedance of only 1Ω or less with respect to the cathode of the ultraviolet sensor 27, so that a sufficient output can be obtained.

Effects of the Invention As described above, according to the present invention, by using an ultraviolet sensor, it is possible to start automatic operation almost at the same time as someone tries to start smoking, and the sensor, which is exposed to the outside, can be connected to a resistor and a capacitor. By having a part connected to the commercial power supply in a parallel circuit, it prevents the risk of electric shock even in the event of damage.
The sensor output can provide a reliable air purifier.

[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 circuit block diagram of the same, and FIG.
4 is an external perspective view of the conventional air cleaner, FIG. 5 is a block diagram of the circuit, and FIG. 6 is a sectional view of the same. 26...Gas sensor, 27...Ultraviolet sensor, 32...Electric blower, _R1 , _R2 , _R3 ...Resistance,
C ₁ , C ₂ , C ₃ ... Capacitors.

Claims (1)

[Claims] 1 It has an ultraviolet sensor and a control circuit that automatically operates the equipment based on its output, one end of the ultraviolet sensor is connected to a power source through a parallel circuit of a capacitor and a resistor, and the other end is connected to a power source through a resistor in series. Air purifier connected to.