JPS6129784B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic precipitator for air purification that charges dust and collects it by electrically adsorbing it, and its object is to obtain an electrostatic precipitator with high dust collection efficiency. At the point.

For example, an electrostatic precipitator as shown in FIG. 1 can be considered. In this electrostatic precipitator, a fan 3 connected to a motor 2 is provided in a ventilation passage inside a main body casing 1, and the rotation of this fan 3 causes the external Dust-containing air is sucked in through the opening 5 of the front grille 4, purified, and then exhausted through the exhaust port 6 at the rear. To clean the dust-containing air taken in through the opening 5, the dust in the dust-containing air is removed by applying a high-voltage power source between the plurality of pairs of counter electrodes 7, the discharge electrode 8, and the auxiliary counter electrode 9, and then removing the dust from the discharge wire 8. When ions generated around the electrode are irradiated in a shower toward the auxiliary counter electrode 9, which has approximately the same potential as the counter electrode 7, they are charged. The charged dust is further attracted by a dielectric filter 10 provided at the rear. At this time, the discharge wire 8, the counter electrode 7, and the auxiliary counter electrode 9 are arranged in this order, with the counter electrode 17 and the discharge wire 18 on one side and the auxiliary counter electrode 19 on the other side with the opening 15 of the front grille 14 in between. Since it is located behind the closed part 11 of the front grille 4, it is not directly exposed to dust-containing air, and therefore operates stably with less dust adhesion even during long-term use. However, the electrostatic precipitator having the configuration shown in FIG. 1 will not be sufficiently effective unless the structural dimensions are appropriate.

The present invention aims to improve the dust collection performance of the electrostatic precipitator having the configuration shown in FIG. 1 by setting the dimensions within an appropriate range. . That is, FIG. 2 shows the dimensional relationship of the charging section constituting the main part of the electrostatic precipitator of the present invention, and the following description will be made based on FIG. 2 and FIG. 3 showing the characteristics. 21...... is a discharge wire, 22...... is a counter electrode, and 23...... is an auxiliary counter electrode having substantially the same potential as the counter electrode 22. The discharge wire 21, the counter electrode 22, and the auxiliary counter electrode 23 face each other. In the embodiment shown in the drawings, there are three charging units 24 in the vertical direction.
have. Reference numeral 25 denotes a dielectric filter provided behind these charging sections 24. By the way, the distance between the discharge line 21 and the auxiliary counter electrode 23 is defined as Y, and the change in dust collection efficiency when Y is changed is measured, and the following conclusion is obtained. The other configuration is the same as that shown in FIG.

As shown in Figure 3, the dust collection efficiency when changing Y decreases significantly when Y exceeds 50 mm;
It can be seen that high efficiency can be obtained if the following conditions are met. This is because the electric field between the auxiliary counter electrode 23 and the discharge wire 21 is extremely reduced when Y exceeds 50 mm, so ions generated around the discharge wire 21 are transferred to the auxiliary counter electrode 21.
This is because it becomes difficult to reach. Therefore, one of the features of the present invention is that the distance between the discharge line 21 and the auxiliary counter electrode 23 is set to 50 mm or less,
Furthermore, it is clear from the drawings that the distance between the discharge line 21 and the counter electrode 22 is shorter than the distance between the discharge line 21 and the auxiliary counter electrode 23.

As described above, according to the present invention, Y≦50mm
By setting [Y is the distance between the discharge line and the auxiliary counter electrode], high dust collection efficiency can be obtained. However, the discharge wire, the counter electrode, and the auxiliary electrode can be installed without facing the ventilation path, and performance deterioration due to adhesion of dust can be prevented, and an electrostatic precipitator that operates stably for a long period of time can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing an example of an electrostatic precipitator before the present invention, FIG. 2 is a vertical cross-sectional view of essential parts showing an example of the implementation of the present invention, and FIG. 3 is a characteristic diagram. 21...Discharge wire, 22...Counter electrode, 23...
Auxiliary counter electrode, 24...Charging section, 25...Dielectric filter.

Claims (1)

[Claims] 1 Place the counter electrode and the discharge wire on one side across the opening of the front grille, and place the auxiliary counter electrode with approximately the same potential as the counter electrode on the other side. The auxiliary counter electrode is provided inside the closed part of the grill, and the potential of the auxiliary counter electrode is set to be approximately the same potential as that of the counter electrode, and a high voltage is applied to the counter electrode, the discharge wire, and the auxiliary counter electrode. The distance between the electrodes is 50
mm or less, and the distance between the discharge wire and the counter electrode is shorter than the distance between the discharge wire and the auxiliary counter electrode.