JPH0360541B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air cleaner that has a function of detecting indoor air pollution 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.

In FIGS. 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 includes an operation switch 10 and a display section 11.
It also has a built-in gas sensor 12 for detecting that 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 1.
3 is input, the control circuit 16 connected to the power supply 14 and the operation circuit 15 judges this, and controls the electric blower 2, the power supply 14 that supplies voltage between the counter electrode 5 and the discharge wire 6, and the 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 a conventional air purifier with an automatic operation function, only the gas sensor 12 was used as a sensor, which was inconvenient in actual use. 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. A waiting time was also required, and there was a problem that automatic operation using the gas sensor output was not possible during this time.

The present invention solves these problems,
The purpose is to provide an air purifier that is highly usable and uses 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 detects its output and automatically operates the equipment. A device that determines the detection of ultraviolet light as a drive signal from the ultraviolet sensor when a predetermined number of pulse inputs are further observed within a predetermined detection time after a certain waiting time has elapsed from the time the first pulse input is received. It will be as follows.

Effects The present invention, with the above-described configuration, is capable of immediately detecting the flame of a lighter, a matchstick, etc. at the time of starting smoking using an ultraviolet sensor, and starting automatic operation. By determining whether or not a predetermined number of pulses are observed in the output of the sensor over a certain time span,
Because the malfunction signal distinguishes the signal from the ignition flame, a fast-response sensor can be used to prevent malfunctions.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The basic configuration of the air purifier itself is the same as before, so we will mainly explain the differences.

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 includes a 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. The ultraviolet sensor 27 is provided on the front 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, and the control circuit 30 automatically operates the electric blower 32 according to each input.
Here, the gas sensor 26 is mainly connected to the cigarette 35 when smoking.
The ultraviolet sensor 27 detects smoke and gas components, etc.
Detects the flame of a lighter 36 for lighting a cigarette 35.

However, the ultraviolet sensor 27 used here is
If the flame of a lighter or the like becomes so sensitive that it can be detected, malfunction of the ultraviolet sensor 27 itself becomes a problem, so it is necessary to prevent malfunction in the detection circuit 34 and the control circuit 30. FIG. 3a shows the UV sensor output in case of a malfunction, in which several pulses of short duration t ₁ occur. FIG. 3b shows the output when a flame from a lighter or the like is detected, and in this case, several pulses are often generated at an interval of _t2 , which is longer than _t1 . Therefore _, in the present invention, as _shown in _FIG . It detects whether (number of measurements) occurs and starts automatic operation based on the output of the ultraviolet sensor. Here, t ₃ is longer than t ₁ , t ₄ is longer than t ₃ , and t ₃ is considered to be approximately 10 msect, _{and 4} is approximately 2 sec.

To explain the operation in the above configuration, when the switch 24 is set to automatic operation and the user lights the lighter 36 or the like to start smoking, the ultraviolet sensor 27 immediately detects the flame. A signal is transmitted to the control circuit 30 via the detection circuit 34, and the electric blower 32 starts operating. As a result, indoor air flows in through the intake port 20 and flows out through the exhaust port 21, increasing the speed of diffusion of smoke and gas components from the cigarette 36. When the gas component reaches the gas sensor 26, the gas sensor 26 sends a signal to the control circuit 30 via the detection circuit 33 depending on its concentration, and the electric blower 32 and the like continue or stop operating. Furthermore, because of the aforementioned malfunction prevention mechanism, the operation can be achieved reliably. Note that it is also sufficiently effective to operate for a certain period of time based only on detection by the ultraviolet sensor 27, regardless of the gas sensor 26. Further, by making it possible to change any one of the waiting time t ₃ detected by the ultraviolet sensor 27, the detection time t ₄ , the number of measurements, or a combination thereof from the outside, the system becomes more user-friendly.

Effects of the Invention As described above, according to the present invention, since an ultraviolet sensor is used, automatic operation can be started immediately when the flame of a lighter or the like is detected when smoking is started.
When used in conjunction with a gas sensor, it has the effect of speeding up the reaction time.Moreover, a waiting time is provided after the first pulse is generated to detect the output of the ultraviolet sensor, and the number of pulses generated within the subsequent detection time is counted. By making a judgment as to whether or not there is a malfunction, the sensor is able to perform reliable detection, thereby providing an air purifier having an automatic operation function with immediate response.

[Brief explanation of drawings]

Fig. 1 is an external perspective view showing an air purifier according to an embodiment of the present invention, Fig. 2 is a circuit block diagram of the air purifier, Fig. 3 a, b, and c are explanatory diagrams of the output relationship of the ultraviolet sensor. The figure is an external perspective view showing a conventional air cleaner, FIG. 5 is a circuit block diagram of the same, and FIG. 6 is a side sectional view of the same. 27... Ultraviolet sensor, 30... Control circuit,
32...Electric blower, _t3 ...Waiting time, _t4 ...Detection time.

Claims (1)

[Claims] 1 It has an ultraviolet sensor and a control circuit that detects its output and automatically operates the equipment, and this control circuit operates within a predetermined time from the time when the first pulse input from the ultraviolet sensor is received. An air purifier that detects a predetermined number of pulse inputs as a drive signal from an ultraviolet sensor.