JPS641006Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Field of Application] This invention relates to an electric air purifier that charges dust in the air with a high-pressure charging unit, and collects the dust by adsorbing it to a dust collection electrode. [Prior Art] Conventionally, in electric air purifiers, a high DC current is applied between the ionization wire (discharge wire) and the counter electrode (ground electrode), as seen in Japanese Patent Laid-Open No. 53-96576. A voltage is applied to form a charged part due to positive corona discharge, and a dust collection electrode with a ground potential is placed downstream of the ionization line of the air flow passing through this charged part, and the inside which is positively charged in the charged part is The structure is such that dust and other particles are adsorbed and collected by the dust collecting electrode. In this case, the dust charged in the charging section is attracted to the dust collection electrode by the air flow and the attraction due to the potential difference between the dust collection electrode and the dust collection electrode, so the attraction force due to the potential difference is increased by setting the dust collection electrode to a negative potential. This increases the amount of dust etc. adsorbed by the dust collection electrode, and improves the dust collection efficiency. FIG. 1 shows such an air purifier, in which a flat counter electrode 2 is provided facing each of the three ionized wires 1 of the high-voltage line, and each ionized wire 1 is connected to a high-voltage unit. 3, and each counter electrode 2 is grounded, and furthermore, an aluminum foam electrode is connected to the downstream side of the air flow flowing into each ionization wire 1 from left to right, that is, on the right side of the ionization wire 1. A breathable dust collecting electrode 4 made of metal or the like is provided, and is connected to the -KV output terminal of the high voltage unit 3. Then, when a 6KV DC high voltage is applied between the ionization line 1 and the counter electrode 2 by the high voltage unit 3, the electric field between the ionization line 1 and the counter electrode 2 increases around the ionization line 1. A positive high-voltage charged part is formed by positive corona discharge in the part, and at this time, when the air to be purified flows into the high-pressure charged part, dust, etc. in the air is positively charged in the high-pressure charged part, and this positively charged body is adsorbed to the dust collecting electrode 4 by collision with the dust collecting electrode 4 due to the flow of air and attraction due to the potential difference between the dust collecting electrode 4 and the dust collecting electrode 4. In particular, the dust collecting electrode 4 has a negative potential of opposite polarity to the ionization line 1. Therefore, the amount of positively charged dust etc. adsorbed increases, and the dust collection efficiency improves. [Problem to be solved by the invention] In the air purifier shown in Fig. 1, when the distance between the high-voltage charging part and the dust collecting electrode 4 is small, due to the potential difference, as shown by the arrow in Fig. 1, , there is a risk that a negative corona discharge will occur from the dust collection electrode 4 to the zero potential counter electrode 2 forming the high-voltage charged part, and in the above case, the dust collection electrode 4 is made of aluminum foam metal and has many Because the needle-like protrusions gather together, corona discharge becomes more likely to occur. Therefore, the negative corona discharge not only increases the amount of ozone generated, but also neutralizes this with the positive corona discharge of the high-voltage charging section, resulting in a significant decrease in dust collection efficiency. The load current of the high voltage unit 3 also increases, which is disadvantageous. This invention was made in consideration of the problems of the conventional technology, and its purpose is to improve the dust collection efficiency by setting the dust collection electrode at a negative potential, and to improve the dust collection efficiency of the charged part. The present invention aims to provide an air purifier that prevents corona discharge between the dust collecting electrode and the dust collecting electrode. [Means for Solving the Problems] In order to achieve the above object, in the air purifier of this invention, the ionization wire is placed at a positive potential between the ionization wire and a counter electrode facing the ionization wire and having a ground potential. Applying a DC high voltage to form a charged part by corona discharge around the ionized wire,
A dust collecting electrode with a negative potential that adsorbs dust, etc. in the air charged by the charging section is disposed downstream of the ionization line in the air flow passing through the charging section, and the ionization line and the counter electrode are arranged. The present invention is characterized in that a breathable insulator is provided between the dust collecting electrode and the dust collecting electrode. [Function] In the air purifier configured as described above, ventilation is created between the charged part formed by applying a DC high voltage between the ionization wire and the counter electrode and the negative potential dust collection electrode. Since it is electrically insulated by a magnetic insulator, corona discharge is prevented from occurring during this time.
On the other hand, since the breathable insulator does not obstruct the flow of air, the dust in the air that is positively charged at the charged part passes through the breathable insulator and is adsorbed to the negative potential dust collection electrode. Dust is collected. [Example] Next, this invention will be described in a second example showing one example of the invention.
This will be explained with figures. In FIG. 2, the same symbols as in FIG. 1 indicate the same things, and the difference is that a plate-shaped breathable insulator made of urethane foam is placed between the ionization wire 1 and the dust collection electrode 4 near the dust collection electrode 4. 5 is provided to prevent negative corona discharge between the high voltage charging section and the dust collecting electrode 4. Here, as shown in FIG. 2, the ionization line 1 is set to a positive potential of +6KV, the counter electrode 2 is set to a zero potential, and the dust collection electrode 4 is set to a negative potential of -3KV. If the distance to the surface is 30m/m,
Data as shown in the following table was obtained depending on the presence or absence of the breathable insulator 5.

[Effect of idea]

Since this invention is configured as described above, it produces the following effects. Since a breathable insulator is provided between the ionizing wire applied at a positive potential and the counter electrode at a ground potential, and the dust collection electrode at a negative potential, the flow of air from the charged part to the dust collection electrode is not obstructed. , it is possible to electrically insulate between the charged part and the dust collecting electrode, and the amount of positively charged dust etc. adsorbed to the dust collecting electrode can be increased, greatly improving dust efficiency. It is possible to prevent the occurrence of corona discharge between the dust collecting electrode and the dust collecting electrode, and to suppress the amount of ozone generated.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an air cleaner that is the basis of this invention, and FIG. 2 is a block diagram showing one embodiment of the air cleaner according to this invention. DESCRIPTION OF SYMBOLS 1... Ionization wire, 2... Counter electrode, 4... Dust collection electrode, 5... Breathable insulator.

Claims (1)

[Claims for Utility Model Registration] A high DC voltage is applied between the ionization line and a counter electrode facing the ionization line at a ground potential, so that the ionization line becomes at a positive potential, and the area around the ionization line is charged by corona discharge. A negative potential dust collection electrode that adsorbs dust, etc. in the air charged by the charging section is disposed downstream of the ionization line in the air flow passing through the charging section, and the ionization line and An air purifier comprising a breathable insulator between the counter electrode and the dust collecting electrode. The air cleaner according to claim 1, wherein the air-permeable insulator is made of urethane foam.