JPH0696130B2 - Air purifier - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cleaning device, and can be applied to an air cleaning device incorporated in an air conditioner.

2. Description of the Related Art Conventional air purifiers normally apply a high voltage of several KV to the charging section, charge the dust in the air passing through this charging section, and collect them on an electrostatic filter behind the charging section. The point of the air cleaning effect is that air cleaning is performed, the charging section and the high voltage generating section operate normally, and the dust in the passing air is sufficiently charged.

Further, in order to ensure safety during maintenance, the air purifying device is obliged to stop charging by a protective device when trying to touch the internal structure.

An example of control of a conventional air cleaning device will be described below with reference to the drawings.

FIG. 5 and FIG. 6 are a block diagram and a circuit diagram of a conventional air cleaning device.

In FIGS. 5 and 6, 1 is a power supply section, 2 is a protection switch, 3 is a high voltage generation section, 4 is a charging section, 5 is an abnormality detection means, 6 is a control section, and 7 is a power supply opening / closing means.

In the power supply unit 1, 1a is a power transformer, 1b is a diode bridge, and 1c is a rectifying capacitor, which converts the power to DC. The protection switch protects at the time of maintenance by opening and closing the power supply from the power supply unit to the high-voltage generating unit, such as a limit switch and a reed switch attached to the door opening / closing unit of the air cleaning device. The high voltage generator 3 uses a switching transformer 3a to convert the DC input into a high voltage and apply it to the electrode of the charging unit 4. 3b is a discharge resistor, 3c is a self-excited switching circuit for driving the switching transformer 3a,
3d is a switching transistor. In the charging section 4, a tungsten wire and a metal plate are arranged in parallel to form an electrode.

In the air cleaning device, the abnormality detecting means 5 is, for example, heat when a discharge state is continued for a long period of time due to an abnormality in the charging portion such as a broken tungsten wire, a short circuit between electrodes due to dust or dust, or a reduction in distance between electrodes. Is provided for the purpose of protecting the life of the high voltage generating circuit.

In the case of an abnormality such as a reduction in the distance between the electrodes due to the entry of foreign matter or the like into the charging portion, the high voltage between the electrodes decreases due to the load characteristics of the transformer. An abnormality detection signal is taken out by this voltage change of the transformer. 5a is a photocoupler, 5b is a zener diode, and 5c is a capacitor, and an abnormality detection signal is output from the collector of the transistor of the photocoupler 5a. The capacitor 5c is connected to the control winding of the switching transformer 3a of the high voltage generator 3, and if the winding voltage is high during normal operation, current flows through the Zener diode 5b to turn on the photocoupler, and the abnormality detection signal is "L" ( Low), and at the time of abnormality, the abnormality detection signal becomes "H" (high).

6 is a control unit, and 6b is a microcomputer (hereinafter referred to as a microcomputer), which is provided with timer means 6a. The signal from the abnormality detecting means 5 is input to the microcomputer 6b. 6c is an operation switch. 7 is a relay contact of the power supply opening / closing means,
The high voltage generator 3 is controlled by controlling the power supply to the coil 6d by the microcomputer 6b. 6e is a light emitting LED for display.

FIG. 7 and FIG. 8 are timing charts of a conventional air cleaning device.

FIG. 7 shows the case where the door protection switch 2 is on, and FIG. 8 shows the case when it is off.

When the operation switch 6c is turned on, the relay contact 7 is turned on and the high voltage of the charging section 4 is applied. The abnormality detection signal becomes “H” at the point where the voltage drops due to the abnormality of the charging section 4,
When it becomes “H” during T ₁ (point), the relay contact 7 is turned off. When the relay contact 7 is turned off, no voltage is applied to the charging section 4. The LED 6e flashes during an abnormality. Since the abnormality signal is due to a reduction in the distance between the electrodes due to the entry of foreign matter between the electrodes, once the abnormality detection signal is input, the relay contact 7 is turned off and the light emitting LED 6e is kept blinking.

FIG. 8 shows the case where the door protection switch 2 is OFF, and even if the relay contact 7 is turned ON by the operation switch 6c ON, no voltage is applied to the high voltage generator 3. Then, the photocoupler 5a of the abnormality detection unit 5 in FIG. 6 remains OFF, the abnormality detection signal becomes "H" at the time of abnormality, the relay contact 7 remains OFF, and the light emitting LED 7e keeps blinking.

The above-mentioned contents are shown in a flowchart in FIG.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the conventional air cleaning apparatus, it is impossible to distinguish between the abnormality of the high voltage generating portion and the OFF of the protection switch of the door. In addition, if the high voltage generator is abnormal, the discharge state will continue due to the disconnection of the electrode wires and the reduction in the distance between the electrodes due to the entry of foreign matter, etc. It is necessary to cut it off for maintenance. On the other hand, the door is not completely closed and the door protection switch is turned off.
In this case, the air purifier can be operated by closing the door completely, but the high voltage generator is turned off by the protection operation.
However, there is a problem in that the abnormality detection signal is input, the power must be turned off, the door must be closed, and then the operation must be performed.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides an air cleaning device with a protection means operation detecting means, an abnormality detecting means for detecting an abnormality of a charging unit and a high voltage generating unit, and a power source unit. Comprising a power supply opening / closing means for controlling energization to the voltage generating portion, the protection means detecting means is provided between the protecting means and the high voltage generating portion,
The protection device operation signal for determining whether or not the high voltage generator is operable and the abnormality detection signal from the abnormality detection means are used as input signals, and when the protection device operation signal is normal, the power supply is opened or closed by the abnormality detection signal. It has a control means for turning off the means. The control means is configured to input an abnormality detection signal from the abnormality detection means and turn off the power supply opening / closing means.

Action The protection means operation detection means detects the operation state of the protection means provided between the protection means and the high-voltage generator, and the abnormality detection signal is simply the operation of the protection means due to an incomplete set of the door. , Distinguishing the discharge state due to disconnection of the electrode wire in the charging portion, and when the protection device operation signal is normal, the power supply opening / closing means is turned off by the abnormality detection signal.

Example Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 and FIG. 2 are a block diagram and a circuit diagram of an air cleaning device in one embodiment of the present invention.

In FIG. 1 and FIG. 2, the power supply unit 1, the protection switch 2, the high voltage generation unit 3, the charging unit 4, the abnormality detection unit 5, the control unit 6, and the power supply opening / closing unit 7 are the same as those in the conventional circuit. The protection switch operation detecting means 8a is a photocoupler.
The primary side of the photocoupler is connected to the DC voltage of the power supply unit 1, the protection switch 2 operates, the DC voltage of the power supply unit 1 becomes 0 when the protection switch 2 is open, the photocoupler 8a is OFF, and the photocoupler 8a The protection means operation detection signal which is the collector output of the secondary side transistor becomes "H". Also protection switch 2
Is closed and the power switch unit 7 is turned on by the operation switch 6b, the power source unit 1 applies the DC voltage to the high voltage generating unit 3,
At this time, the photocoupler 8a is turned on, and the protection means operation detection signal becomes "L".

The protection means operation detection signal is input to the microcomputer 6b of the control unit 6.

FIG. 3 is a timing chart diagram in one embodiment of the present invention.

When the operation switch 6c is turned on, the relay contact 7 is turned on. However, the a charge section 4 door incomplete protection switch-off of is OFF voltage is not applied, the protection means operating detection signals and the abnormality with the detection signal is "H" and the relay contacts after the predetermined time T ₁ Turn off 7 and make LED 7e blink (point). It can be recognized from this blinking pattern that the protection switch is OFF, and when the protection switch is turned ON (point), the relay contact 7 is turned ON again, the voltage is applied to the charging unit 4, and the air cleaning function operates.

On the other hand, when there is an abnormality in the charging section and only the abnormality detection signal becomes “H” (point), the relay contact 7 is turned off after a predetermined time T ₁ (point) as usual, and the light emitting LED is made to blink in the blinking pattern 2. , Turn off the power, and keep that state until maintenance.

The contents described above are shown in the flowchart of FIG.

EFFECTS OF THE INVENTION According to the air cleaning apparatus of the present invention, the protection means detection means is provided between the protection means and the high voltage generation portion, and the protection device operation signal for determining whether or not the high voltage generation portion is operable is output to the control portion. By inputting to, it is not possible to distinguish between the case where the conventional protective means operates and the abnormality due to the discharging state of the charging part, and for safety and prevention of shortening the life of the equipment, turn off the power of all the power supply opening / closing means and perform maintenance. It is possible to eliminate the unreasonableness that was held until the above is done, and by distinguishing the blinking pattern of the display, it is possible to judge the defective portion.

[Brief description of drawings]

FIG. 1 is a block diagram of an air cleaning apparatus according to an embodiment of the present invention, FIG. 2 is a circuit diagram of the air cleaning apparatus, and FIG.
FIG. 4 is a timing chart of the air purifier, FIG. 4 is a flow chart, FIG. 5 is a block diagram of a conventional air purifier, FIG. 6 is a circuit diagram of the conventional example, and FIGS. FIG. 9 is a timing chart when the protection switch is turned on and when it is turned off in the conventional example, and FIG. 9 is a flowchart diagram of the conventional example. 1 ... Power supply part, 2 ... Protective means, 3 ... High voltage generating part,
4 ... Charging part, 5 ... Abnormality detecting means, 6 ... Control part, 7
...... Opening / closing means, 8 …… Protecting means detecting means.

Claims (1)

[Claims] 1. An air cleaning apparatus comprising a power supply section, a protection section, a high voltage generating section and a charging section, and a protection section operation detecting section for preventing the air cleaning apparatus from being directly touched during operation, and the charging section. And an abnormality detecting means for detecting an abnormality of the high voltage generating section, and a power source opening / closing means for controlling the power supply from the power source section to the high voltage generating section. And a protection device operation signal for determining whether or not the high voltage generator is operable and an abnormality detection signal from the abnormality detection means as input signals. An air cleaning device having a control means for turning off the power supply opening / closing means in response to a detection signal.