JPS59132952A - Display apparatus of air purifier - Google Patents

Abstract

PURPOSE:To make it possible to display the amount of dust accumulated in a dust collecting part by electrically detecting the same, by detecting the density of the current flowing a dust collecting electrode part. CONSTITUTION:A dust collecting part 2 receives high voltage from a terminal 11 at one end thereof and earthed at the other end thereof through a current detecting resistor 3 while voltage-drop generated in the resistance corresponds to the current flowing the dust collecting part 2. Voltage showing this voltage- drop is applied to one input terminal of a comparator 4 while amplified by an amplifier circuit 6. Stabilized voltage is fabricated from main current voltage applied to a terminal 12 by a stabilizing circuit 7 consisting of resistor and a constant-voltage diode and this voltage is divided by voltage dividing resistors 8, 9 to generate desired reference voltage at a voltage dividing point 13 from where the reference voltage is applied to the other input terminal of the comparator 4. The comparator 4 generates an output signal when dust is accumulated and voltage corresponding to the current flowing the dust collecting part 2 becomes large with respect to the reference voltage of the voltage dividing point 13 and a light emitting diode 5 is lighted through a current restricting resistor 10.

Description

[Detailed Description of the Invention] The present invention includes a charging section (ionizer) and a dust collecting section (collector).
The present invention relates to a display device for an air purifier that indicates when the dust collection capacity is reduced due to accumulation of dust in the dust collection part in an electrostatic air purifier that uses a two-stage dust collection method.

Conventionally, measures related to the capacity of the dust collection section were based on instruction manuals,
When a certain period of time has elapsed based on the output of a timer circuit that measures a certain period of time, the dust collecting section is prompted to be replaced or cleaned.

However, when using an instruction manual, the user may forget when to replace the product, and whether using an instruction manual or a timer circuit, both methods are effective against the fact that the dust collection capacity changes depending on the actual usage conditions. The problem is that there are times when this is not achieved. This problem is different from air purifiers that are installed in large rooms that accommodate a large number of people and are operated constantly or periodically.This problem is caused by ordinary passenger cars, small microbuses, and freight cars that have a small number of people and have a large variation in the presence or absence of smokers. It is even more noticeable in such cases.

The present invention aims to solve the above-mentioned problems, and in particular, it aims at making it possible to display the dust collection capacity corresponding to actual use.

For this reason, the present invention focuses on the fact that the dust collection ability can be detected as an electrical characteristic of the dust collection section, and is characterized in that the amount of dust accumulated in the dust collection section is electrically detected and displayed. shall be.

1 and 2 show an embodiment of the present invention, and FIG. 1 shows a schematic configuration of an air purifier. 1 and the dust collecting section 2 are arranged in tandem. Airflow generated in the duct D by a blower (not shown) is sucked in from the interior of the vehicle along the arrow, and is blown out into the interior of the vehicle again.

In the electric circuit shown in FIG. 2, the dust collecting section 2 receives a high voltage (-1, 6
KV) is applied, and one end thereof is grounded via a galvanometric resistor 3. The voltage drop that occurs across the resistor 3 corresponds to the current flowing through the dust collecting section 2. The voltage indicating this voltage drop is amplified by the preamplifier circuit 6 and sent to the comparator 4.
is applied to one input terminal of

A constant voltage is applied to the other input terminal of the comparator 4. That is, a stabilized voltage is created from the main power supply voltage applied to the terminal 12 from the car battery by the stabilizing circuit 7 consisting of a resistor and a voltage regulator diode,
This voltage is divided by voltage dividing resistors 9 to produce a desired reference voltage at voltage dividing point 13. Comparator 4 is the voltage dividing point 1
When the voltage corresponding to the current flowing through the dust collecting section 2 is large with respect to the reference voltage No. 3, an output signal that becomes high level is provided at the output terminal. This output signal is given to a light emitting diode 5, which is a display element, via a current limiting resistor 10, and when this output signal is at a high level, the light emitting diode 5 lights up to inform the occupants.

In the above configuration, the dust collecting section 2 has a resistance of, for example, 1 (IMΩ or more) in an unused state, that is, before dust is collected, due to the preset gap between the electrodes. The current flowing through the dust collecting section 2 is extremely small.However, when the air purifier is used and dust accumulates in the dust collecting section 2, the insulation between the electrodes decreases, and the value of the flowing current increases.

Figure 3 shows this experimental characteristic. When the dust is cigarette smoke, the value of the current flowing through the dust collecting section 2 when cigarette smoke equivalent to several hundred cigarettes passes through the dust collecting section filter. increases rapidly.

The voltage drop across the resistor 3 due to this current is amplified by the amplifier circuit 6 and compared with a preset reference value by the comparator 4. The reference value can be set to an appropriate value with reference to experimental results, and by detecting a sudden increase in the current value corresponding to the amount of dust accumulated in the dust collecting section 2, the light emitting diode 5 By supplying current to the dust collecting section 2, replacement or cleaning of the dust collecting section 2 can be prompted at an appropriate time.

In the above embodiments, it is also possible to use a one-emission type device having other notification functions as the display device 5, such as a 7-point display device, for example.

As described above, according to the present invention, there is an excellent effect in that the display can be displayed in accordance with the actual usage state of the dust collecting section.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view showing the configuration of an air purifier to which the present invention is applied, Fig. 2 is an electrical wiring diagram showing an embodiment of the present invention, and Fig. 3 shows the time change of the dust part. FIG. ■...Charging part, 2...Dust collection part, 3...Galvanometric resistance,
4... Comparator, 5... Light emitting diode forming a display element. Representative Patent Attorney Takashi Okabe (Figure 1, Figure 3, Tabago draft 11kC book)

Claims (1)

[Claims] An air purifier having a charging part and a dust collection part, comprising a detection circuit that detects the magnitude of the current flowing through the dust collection electrode part, and an electrical display element that is activated according to the current value. Air purifier display device.