JPS6122685Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a purification device that electrostatically purifies an insulating liquid such as oil, and an object of the present invention is to perform efficient dust collection.

A conventional liquid electrostatic purification device is explained with reference to Fig. 1. 1 is a metal case provided with an inlet 2 and an outlet 3 for an insulating liquid such as oil, and a porous case inside. A positive electrode 4 with a dust collector 6 interposed therebetween.
and negative electrodes 5 are alternately arranged vertically. Reference numeral 7 denotes an insulating frame provided between the electrodes 4 and 5, the dust collector 6, and the case 1.

When the liquid flowing in from the inlet 2 passes through the dust collector 6 between the electrodes 4 and 5, undissolved substances therein are electrostatically collected on the dust collector 6. However, in the above configuration, the fine particles in the liquid that flowed in from the inlet 2 enter the dust collector 6 as they are, so the dust collection efficiency per pass is not very good, and it takes a long time to perform reliable purification. The dust collector had to be passed through the dust collector several times. Furthermore, since most of the insoluble substances collected tend to be collected in the same size as they are, the size of the dust collecting body is not used effectively, resulting in a significant deterioration of its lifespan.

The present invention eliminates the above-mentioned conventional drawbacks, and examples thereof will be described below with reference to FIGS. 2 and 3.

In Figures 2 and 3, reference numeral 11 denotes a metal case with an inlet 12 for insulating liquid such as oil at the bottom and an outlet 13 at the top, and a positive electrode 1 inside.
4 and negative electrodes 15 are arranged vertically alternately, and a porous dust collector 1 is arranged between these electrodes 14 and 15.
6 is interposed. Further, a net-shaped transparent positive electrode 17 is provided between the electrodes 14 and 15 and the bottom surface of the case 11, and located on the downstream side of the inlet 12. And the positive electrode 14 and the negative electrode 15
The transparent positive electrode 17 is insulated from the case 11 via the insulating frame 18, and the positive electrode 14 and the transparent positive electrode 17 are connected to the positive side of the high voltage power supply 19 and the negative electrode 15.
The case 11 is connected to the negative side, and the case 11 is grounded.

In the above configuration, the liquid flowing in from the inlet 12 enters between the case 11 and both electrodes 14 and 15, where the transparent positive electrode 17 is connected to the positive electrode and the transparent positive electrode 17 is connected to the negative electrode as shown in FIG. Negative electrode 1
A new electric field 20 is generated between the liquid and the liquid, and the fine particles 21 that are insoluble substances in the liquid within this electric field 20 are polarized and attracted to each other, causing them to aggregate and become coarse.
Furthermore, if the transmitting positive electrode 17 and the bottom surface of the case 11 are located close to each other and a strong electric field is generated, fine particles between them will also aggregate.

Now, most of the particles that have aggregated in the electric field 20 are electrostatically collected in the dust collector 16 near the negative electrode 15, and the particles that have not been polarized are collected in the dust collector 16 near the positive electrode 14.
dust tends to be collected. For this reason, the dust collector 16
The dust is collected relatively uniformly on both the positive electrode 14 side and the negative electrode 15 side.

Note that if the density of the dust collector 16 is made non-uniform, relatively coarse particles will be collected in areas with low density, and fine particles will be collected in areas with high density, making the dust collector 16 more efficient. It is easy to use and can reduce pressure loss.

In this way, according to the present invention, by polarizing the fine particles and coagulating them together before they are collected by the dust collector, the dust collection efficiency of the dust collector increases, and the liquid can be collected in less time than before. Reliable purification can be performed, and electricity costs can be kept low. Furthermore, since the dust collector collects not only fine particles but also relatively coarse particles, its lifespan can be extended.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional example, FIG. 2 is a sectional view showing an embodiment of the present invention, and FIG. 3 is an enlarged sectional view of a main part. 12... Inflow port, 14... Positive electrode, 15... Negative electrode, 16... Dust collector, 17... Transmissive positive electrode.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Located between a dust collection part in which a porous dust collection body is interposed between positive and negative electrodes and a liquid inlet; A liquid electrostatic purification device comprising a liquid permeable positive electrode facing the negative electrode at a distance from the negative electrode. (2) The liquid electrostatic purification device according to claim 1, in which the dust collector has a density change of density.