JPH02106631A - Air purifier - Google Patents

Abstract

PURPOSE:To make it possible for a user to know a proper replacement time of a filter with ease and hence use a filter with a refreshed cleaning capacity all the time by detecting a drop in a voltage of an automatic vibration switching power source in a high voltage generator. CONSTITUTION:An AC signal enters a capacitor 4a from a voltage source 2 where the signal is made smooth by a Zener diode 4b and a capacitor 4c and supplied to a Zener diode 4d. As a result, a photocoupler 4e operates so as to supply a voltage output signal 'L'. When a charge filter is contaminated and hence results in a drop an insulation resistance, an electric current 2i flows in large quantities, thereby reducing a voltage peak between A and B of a high voltage generator 2. In a similar manner, a detected voltage at the point C also drops. If an attempt is made to set a detected voltage to D, a photocoupler 4e will come to a halt at a certain contamination degree while the voltage output signal turns into 'H'. Having received the signal 'H', a microcomputer 5a in a control section 5 is adapted to demagnetize a relay 6a, separates a relay contact 6, and cuts off the power supply to the high voltage generator 2. At the same time, an LED 7a for a display means 7 flickers, thereby informing a user that now is the time to replace the filter by its signal.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air cleaning device, and can be applied to air conditioners, air cleaning devices, etc.

BACKGROUND OF THE INVENTION Conventional air purifiers usually apply a high voltage of several KvO to a charging section to charge dust particles in the air that pass through the charging section.
Air purification is performed by collecting dust on the electrostatic filter behind the charging section, and the air purification effect is achieved when the charging section and high voltage generation section operate normally and sufficiently charge the Am in the air passing through. This is the point.

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.

5 and 6, 1 is a power supply section, 2 is a high voltage generation section, 3 is a charging section, and 9 is an electrostatic filter section.

In the ti part l, 1a is a power transformer, 1b is a diode bridge, 1c is a rectifier capacitor, and the DC of the power supply is
make changes. The high voltage generation section 2 converts the DC input into a DC high voltage using the switching 1-lance 2a, and the charging section 3
applied to the electrode. 2b is a discharge resistor, 2c is a self-oscillation switching circuit that drives the switching transformer 2a, and 2d is a switching transistor. In the charging section 3, a tungsten wire and a metal plate are arranged in parallel to form an electric paddle. The charged section 3 applies high pressure to the ionized dirty air, which is then purified by the electrostatic filter 9 .

Problems to be Solved by the Invention However, in conventional air purifying devices, the electrostatic filter has to be replaced after several months have elapsed, and then the filter is removed and visually checked for dirtiness, and if it is found to be dirty, it is replaced. In severe cases, they can be used for months after being contaminated and their cleaning ability has deteriorated.

Means for Solving the Problems In order to solve the above problems, the present invention provides an air purifying device that includes:
A charged filter section, a voltage detection comparison means for detecting a voltage drop from the high voltage generation section, a display means for receiving a signal from the voltage detection comparison means and informing that the filter needs to be replaced, and a power supply section to the high voltage generation section. The device is composed of a control section that controls a power source opening/closing means for stopping energization of the device.

Furthermore, in order to accurately detect dirt on the charged filter, the present invention comprises a humidity detection means for detecting humidity, and a humidity correction means for changing the settings of the voltage detection comparison means depending on the humidity.

action The effects of the above means are as follows.

Due to dirt on the charged filter section, when its life reaches its end, the insulation resistance of the charged filter section will decrease, the output ii of the high voltage generation section will increase, and as a result, the voltage of the self-excited switching power supply of the high voltage generation section will decrease. . By detecting this voltage drop, it is possible to know whether the charged filter section is dirty. After detecting the reduced voltage, the power supply to the high voltage section is stopped by the power switching means and the user is notified by the display means, so that the user can easily know when it is time to replace the filter.

Also, due to humidity, the insulation resistance of the charged filter section may decrease, making it impossible to accurately detect dirt.
By changing the settings of the voltage detection comparison means using the humidity detection means and the humidity correction means, it is possible to accurately inform the user of the need to replace the filter.

Example An embodiment of the present invention will be described below.

FIGS. 1 and 2 are a block diagram and a circuit diagram of an air cleaning device according to an embodiment of the present invention.

In FIGS. 1 and 2, the power supply section 1 and high voltage generation section 2 are the same as those in the conventional circuit. The charging filter section 3' has a configuration in which the charging section 3 and filter section 9 of the conventional circuit are shared. In other words, the high-voltage wire 3a and low-voltage wire 3b of the charging section are wound thinly, and a polymer film 3c serving as an insulation distance M&fl and a filter is sandwiched between them. 4 is a voltage detection means, 4a is a capacitor, 4b is a diode, 4c is a capacitor, 4d is a Zener diode, and 4e is a photocoupler.

Explain the normal operation.

During normal operation, an AC signal is input from the high voltage source 2 to the capacitor 4a, smoothed by the diode 4b and capacitor 4c, and supplied to the Zener diode 4d.

As a result, the photocoupler 4e operates and the voltage output signal "L"
” (low) is supplied. FIG. 3 is a graph of insulation resistance and degree of contamination of the charged filter section. It can be seen that the insulation resistance decreases as the charged filter becomes dirty.

When the insulation resistance decreases, more current 21 flows, and as a result,
The peak value of the voltage between A and B of the high voltage generating section 2 decreases.

FIG. 4 is a graph of the degree of contamination of the charged filter section and the detected voltage at the 0 point of the voltage detection section. When the peak value of the voltage between A and B decreases, the detected voltage at the 0 point also decreases. If the detection voltage is set to D, the photocoupler 4e will stop at a certain degree of contamination, and the voltage output signal will become "H" (high). 5a demagnetizes relay 6a, disconnects relay contact 6,
The power supply to the high voltage generating section 2 is cut off, and at the same time, the LED 7a of the display means 7 is blinked to notify the user of the filter replacement signal.

The operation will be explained using FIGS. 5 and 6.

When the operation switch is turned on, relay 6 operates and the light emitting LED
7a lights up. The detection voltage C is rH.

(High), and the voltage detection signal becomes "LJ (Low). When the charged filter section 3 gets dirty and reaches the end of its life, the detection voltage starts to drop, and when it falls below the set voltage, the voltage detection signal becomes N.
('' (high), the relay 6 stops, and the light emitting LED 7a blinks.

Next, a second embodiment of the present invention will be described with reference to FIGS. 7 to 12. Components that are the same as those in the first embodiment are given the same reference numerals and description thereof will be omitted.

In FIGS. 7 and 8, the humidity signal detected by the humidity detection means 8 is input to the microcomputer of the control unit 5, and the humidity correction means 5a selects "H" (high) from A to B according to the humidity. ), thereby becoming a photocabra,
4d, 4f, 4g operate, resistor 41, 4j, 4k,
A reference voltage determined by the partial pressure of 41 is set according to the humidity. During normal operation, an AC signal is input from the high voltage power supply 2 to the capacitor 4a, smoothed by the diode 4b and capacitor 4C, and supplied to the Zener diode 4d. A voltage divided by the Zener diode 4d and the resistor 4m is input to the comparator.

A resistor 4P, a Zener diode 4m, and a capacitor 40 create a power supply voltage for a comparator 4k, a photocoupler 4e, and a reference voltage generator.

FIG. 9 is a diagram showing the relationship between the insulation resistance of the charged filter section 3 and the degree of contamination. It can be seen that the curve of the graph changes depending on the humidity. FIG. 10 is a diagram showing the relationship between detection voltage and degree of contamination. By changing the set voltages E, F, and G depending on the humidity, settings can be made for the same degree of dirt. Here, set the humidity to 40% or less, 40 to 70%, 7
Although it is set to 0% or more, it is not limited to this setting.
The three points are 40% or less, 40-70%, and 70% or more, but the number is not limited to these.

The operation will be explained using FIGS. 10 and 11.

If the humidity is below 40%, boat (A) becomes H (high) and boats (B) and (T) are open. If the humidity is between 40% and 70%, the boat toy will be set to "H" (
The boat (a) and boat (tsu) become open. If the humidity is over 70%, the boat will
H” (high), and the boat (A) and boat (B) are open. In this way, the boat output is changed depending on the humidity.

The subsequent operations are the same as in the first embodiment.

Effects of the Invention As is clear from the above embodiments, the present invention allows the user to easily know when it is time to replace the filter, and prevents the user from forgetting to replace the filter and continuing to use it with reduced cleaning ability. In addition, it becomes more convenient as it eliminates the hassle of having to take out and inspect the filter each time it is replaced.

In addition, by adding detection correction based on humidity, it is possible to more accurately determine how dirty the filter is, and to avoid accidentally replacing the filter even when it is not time to replace it due to high humidity. It disappears.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an air purifying device according to an embodiment of the present invention, Fig. 2 is a circuit diagram of the air purifying device, and Fig. 3 is a block diagram of an air purifying device according to an embodiment of the present invention.
The figure shows the insulation resistance and degree of contamination of the charged filter section.
Fig. 4 is a diagram showing detection voltage and degree of contamination, Fig. 5 is a timing chart of the air purifier, Fig. 6 is a flowchart of the air purifier, and Fig. 7 is a diagram showing the second embodiment of the present invention. A block diagram of the air purifying device in the example, FIG. 8 is a circuit diagram of the same air purifying device, FIG. 9 is a diagram showing the relationship between the insulation resistance of the charged filter section, the degree of dirt, and humidity, and FIG. 10 is the detection voltage level. Fig. 11 is a timing chart of the air purifying device, Fig. 12 is a flow chart of the air purifying device, and Fig. 13 is a block diagram of a conventional air purifying device. , FIG. 14 is a circuit diagram of the air cleaning device. l...Power supply section, 2...High voltage generation section,
3... Charge section, 3'... Charge filter section, 4... Voltage detection means, 5... Control section, 5b... Humidity correction means, 6... Power supply opening/closing means, 7... Display means 1.8...
- Humidity detection means, 9...filter section. Name of agent Patent attorney Shigetaka Awano 1 person Figure 3) Funeral diagram 3

Claims (2)

[Claims] (1) In an air purifying device comprising a power supply section, a high voltage generation section, and a charged filter section, a voltage detection comparison means for detecting voltage drop due to dirt in the charged filter section; An air purifying device comprising: a control unit that receives a signal and performs control; a power source opening/closing unit that controls energization to a high voltage generating unit; and a display unit that notifies a user to replace the charged filter unit. (2) The air purifying device according to claim (1), comprising a humidity detection means for detecting humidity, and a humidity correction means for changing the setting of the voltage detection and comparison means depending on the humidity.