JPS6356823B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an air cleaner, and specifically relates to the structure of an ion generator used in an air cleaner.

(B) Prior Art As shown in FIGS. 1 and 2, a conventional air purifier is provided with a pair of breathable electrode plates 3 and 4 facing each other with a filter medium 2 in between on the intake side of the main body 1, and An ion generator 5 is provided on the exhaust side of the chamber, and a high voltage power supply circuit 6 is connected to the ion generator and a pair of breathable electrode plates for applying a high voltage.
The ion generator 5 includes a needle electrode X as a negative electrode.
and a counter positive electrode plate Y that faces this needle electrode, and is configured to generate anions by corona discharge between the needle electrode and the counter positive electrode.
In this air purifier, air flowing into the main body 1 has dust removed while passing through the breathable electrode plates 3 and 4 and the filter medium 2, and is discharged to the outside of the main body 1. At this time, anion generator 5 adds anions to the air discharged outside the main body. The addition of anions is a generally well-known method used to improve the dust collection ability of air cleaners.

However, with this structure, when dust adheres to the filter medium 2 during dust collection and the electrical resistance value between the breathable electrode plates 3 and 4 decreases, causing a high discharge current to flow through the high voltage power supply circuit 6, ions are generated. The output voltage _VH of the high voltage power supply circuit 6 applied to the device 5 decreases due to the internal resistance of the high voltage power supply. Then, this decreased output voltage V _H becomes the corona starting voltage as shown in Fig. 3, for example, about 1500 volts or less when the distance (gap length) between the needle electrode When this happens, the corona discharge between the needle electrode X and the opposing positive electrode plate Y stops, and anions are no longer generated from the ion generator 5, resulting in a drawback that the dust collection ability of the air purifier body is significantly reduced.

(c) Purpose of the invention This invention was made in view of the above circumstances.
Even if dust adheres to the filter medium and the dust collection ability of the filter medium decreases, the ion generator can generate anions, thereby preventing the main body from decreasing its dust collection ability.

(d) Structure of the Invention The structure of the present invention is to provide a pair of breathable electrode plates facing each other with a filter medium in between on the intake side of the main body, and generate anions by corona discharge on the exhaust side of the main body. An ion generator consisting of a negative electrode needle and two positive electrode plates is provided, and a high voltage power supply circuit that applies a high voltage is connected between the negative electrode needle and one of the positive electrode plates, and the other positive electrode plate is connected to a high voltage power supply circuit that applies a high voltage. This is an air cleaner in which an electrode plate is connected to one of the breathable electrode plates, and the other breathable electrode is connected to the anode side of a high voltage power supply circuit.

(e) Examples This invention will be described in detail below based on examples shown in the figures. Note that this invention is not limited to this.

4 and 5 show the overall configuration of the air cleaner 7,
8 is a main body having an intake port 9 and an exhaust port 10. A pair of breathable electrode plates 12 and 13 are provided near the intake port in the main body, and a needle electrode 17 as a negative electrode needle is provided near the exhaust port in the main body. An ion generator 14 consisting of two opposing positive electrode plates 18 and 19 facing each other with a space in between is provided, and a high voltage is applied between one of these opposing positive electrode plates 19 and the needle electrode 17. A high voltage power supply circuit 15 is connected. Reference numeral 16 denotes a blower fan inside the main body 8 that sucks air into the main body 8 and exhausts it to the outside of the main body 8.

While connected to the other opposing anode plate 13 of the ion generator, the other breathable electrode plate 12 is connected to the anode side of the high voltage power supply circuit 15.

A method for generating anions using the air cleaner 7 having the above configuration will be explained.

First, a high voltage is applied to the high voltage electrode circuit 15 to generate corona discharge between the needle electrode 17 and the opposing positive electrode plate 19 connected to the high voltage power supply circuit 15.
At the same time, the blower fan 16 is operated to blow air into the main body 8.
The filter medium 11 collects dust contained in the air. Then, anions are added to the air after the dust collection and the air is exhausted outside the main body 8. Here, when there is no dust attached to the filter medium 11, that is, when there is high resistance between the breathable electrode plates 12 and 13, the breathable electrode 1
A high voltage is applied between 2 and 13 to reliably collect dust. Further, at this time, since the voltage applied between the counter positive electrode plate 18 connected to the breathable electrode plate 13 and the needle electrode 17 is low, no corona discharge occurs.
On the other hand, when dust adheres to the filter medium 11, the electrical resistance value between the breathable electrode plates 12 and 13 decreases, and the filter medium 1
Although the dust collection ability of 1 is reduced, the breathable electrode plate 12,
The discharge current flowing between electrodes 13 increases, and a high voltage is applied between the needle electrode 17 and the counter positive electrode plate 18 connected to the breathable electrode plate 13, causing corona discharge and generating anions. At this time, a constant amount of anions is generated between the opposing positive electrode plate 19 connected to the high voltage power supply and the needle electrode 17, regardless of the amount of dust attached to the filter medium 11, so the ion generator 14 The amount of anions generated increases, thereby preventing a decrease in the dust collecting ability of the filter medium 11 with dust attached thereto.

By configuring the air purifier 7 as described above, even if dust adheres to the filter medium and the dust collection capacity of the filter medium decreases, the amount of dust that has increased from the ion generator to the filter medium will increase compared to when no dust adheres to the filter medium. Can generate anions,
This prevents the deterioration of the dust collection ability of the main unit.
Moreover, even if the electrical resistance value of the filter medium decreases, high current can be prevented from flowing into the high voltage power supply circuit, thereby improving the safety of the main body. In addition, even if a part of the breathable electrode connected to the ion generator is exposed outside the main body, a corona discharge current (less than a few μA) will be applied to that part.
It is highly safe because only water flows.

(f) Effects of the invention This invention comprises an ion generator comprising a negative electrode needle and two positive electrode plates, one of these positive electrode plates and the negative electrode needle is connected to a high voltage power supply circuit, and By connecting the other positive electrode plate to either one of the breathable electrode plates, even if dust adheres to the filter medium and the dust collection ability of the filter medium decreases, the dust will not adhere to the filter medium from the ion generator. It is possible to generate an increased amount of anions than when no filter is used, thereby preventing a decrease in the dust collection ability of the main unit, and even if the electrical resistance of the filter medium decreases, it also prevents high current from flowing into the high voltage power supply circuit. This makes it possible to improve the safety of the main body.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of the main parts of a conventional air purifier, Figure 2 is its electric circuit diagram, Figure 3 is the distance between the needle electrode and the opposing positive electrode plate in the ion generator,
FIG. 4 is a diagram corresponding to FIG. 1 showing an embodiment of the air cleaner according to the present invention, and FIG. 5 is an electric circuit diagram thereof. 7... Air purifier, 8... Main body, 11... Filter medium, 12, 13... Breathable electrode plate, 14... Ion generator, 15... High voltage power supply circuit, 17... Needle electrode, 18, 19...Opposing positive electrode plate.

Claims (1)

[Claims] 1 A pair of breathable electrode plates are provided on the intake side of the main body, facing each other via a filter medium, and a negative electrode needle and two positive electrode plates that generate anions by corona discharge are provided on the exhaust side of the main body. A high voltage power supply circuit for applying a high voltage is connected between the negative electrode needle and one of the positive electrode plates, and the other positive electrode plate is connected to one of the breathable electrode plates. An air purifier in which the air permeable electrode plate is connected to one side, and the other breathable electrode plate is connected to the anode side of a high voltage power supply circuit.