JPS6340585B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic liquid purification device for liquids such as insulating oil containing impurities such as dust.

A conventional device of this type will be described with reference to FIGS. 1, 2, and 3. 1 is a tank containing a liquid 2 to be purified, and 3 is a metal septic tank. 4
is the supply pipe installed at the bottom of the septic tank 3.
It has a large number of holes 5 that open into the inside of the tube. 6 is a U-shaped high voltage side electrode plate attached to the septic tank 3 via an insulating plate 7, and 8 is a ground side electrode plate which forms a counter electrode together with the septic tank 3. 9 is a dust collector made of a porous or fibrous insulating material interposed between the electrode plates 6, 8 and the septic tank 3, and 10 is a support thereof. 11 is a discharge pipe installed at the top of the septic tank 3; 12
13 is a lid plate, and 13 is a packing. Reference numeral 14 denotes a coarse dust storage chamber formed at the bottom of the septic tank 3. 15
is a hose that connects the tank 1 with the supply pipe 4 and the discharge pipe 11. 16 is a DC high voltage power supply applied between the electrode plate 6 on the high voltage side and the counter electrode (electrode plate 8 on the septic tank 3 and the ground side).

In the above configuration, the liquid 2 containing dust is sent from the tank 1 to the supply pipe 4 via the hose 15 and enters the septic tank 3 through the hole 5, and the coarse dust is stored in the storage chamber 14.
The liquid containing fine dust rises through the space between the dust collectors 9. During this time, fine dust contained in the liquid is charged by the electric field formed inside the septic tank 3 and is attracted to the electrode plates 6 and 8 or the septic tank 3, or collected by the dust collector 9. The liquid from which dust has been removed returns to the tank 1 from the discharge pipe 11 via the hose 15.

FIG. 3 is a side sectional view of one electrode pair, in which a dust collector 9 is inserted uniformly between the electrode plates 6 and 8 from the inflow side to the outflow side, and the liquid to be purified moves in the direction of the arrow. It is configured.

In this conventional configuration, insoluble liquids such as water in oil are also collected by the electrode plates 6, 8 or the dust collector 9 and aggregated, which then accumulates below the dust collector 9. . However, when a conductive state is formed between the electrode plates 6 and 8 due to moisture, the voltage between the electrode plates 6 and 8 decreases, and almost no electric field is formed.
The purifying effect will be lost. Also, high voltage current will flow, which will generate a lot of heat, creating a dangerous situation. For this reason, a high-voltage overcurrent prevention device is provided to disconnect the high-voltage power supply when a current exceeding a certain level flows.

The present invention improves upon such conventional devices.

An embodiment of the present invention will be described below with reference to FIG. Here, the same parts as the conventional one are given the same reference numerals. A dust collecting body 21 made of a porous or fibrous insulating material inserted between the electrode plates 6 and 8 has an inclined surface 22 so that the inlet side of the liquid to be purified does not come into contact with the electrode plates 6 or 8. . On the other hand, the outflow side of the liquid to be purified is the electrode plate 6 that did not come in contact with the inflow side.
An inclined surface 23 is configured on the opposite side so as to be in contact with or 8.

In this configuration, when the liquid to be purified flows in,
Insoluble conductive liquid, such as water droplets in oil, is collected by the electrode plates 6 and 8 and the dust collector 21. Its concentration is high on the inflow side and low on the outflow side. If a porous dust collector is provided on the inlet side where the conductive liquid concentration is high so as to be in contact with the electrode plates 6 and 8 as in the conventional example, this will result in promoting electrical conduction between the electrode plates. In the embodiment of the invention, one electrode plate 6 or 8 is configured so as not to come into contact with the other electrode plates 6 or 8, so that even if the collected liquid is accumulated below the dust collector 21, no electrical conduction occurs between the electrode plates 6 and 8. Also, on the outflow side, the conductive liquid flows into the dust collector 2.
In order to prevent the liquid from flowing out of the septic tank 3 without contacting the septic tank 3, the dust collector 21 is configured so that the electrode plate 6 or 8, which did not come in contact on the inflow side, comes into contact with the dust collector 21, and the liquid to be purified is always collected in a porous dust collector. Since it passes through the body 21, high collection efficiency can be obtained.

Note that, as shown in FIG. 5, depending on the concentration of the conductive liquid in the outflow portion, the same effect can be obtained even if the dust collector 21 is provided so as to be in contact with both the electrode plates 6 and 8.

Furthermore, as a method of preventing the electrode plates 6 and 8 from coming into contact with the dust collector 21, the same effect can be obtained by using spacers made of an insulating material instead of the inclined surfaces 22 and 23.

In this manner, the present invention takes into consideration the related structure between the electrode plates and the dust collector, thereby reducing the risk of high voltage current flowing between the electrode plates and achieving high collection efficiency.

[Brief explanation of drawings]

Figure 1 is a sectional view showing the configuration of a conventional electrostatic liquid purifier, Figure 2 is a sectional view of the main parts, Figure 3 is a sectional view of the electrode plate section, Figures 4 and 5. 2A and 2B are cross-sectional views of the structure of an electrode plate portion showing examples of the present invention, respectively. 3... Septic tank, 6, 8... Electrode plate, 21... Dust collector.

Claims (1)

[Claims] 1. An electrode plate that collects dust and insoluble liquid by passing the liquid to be purified in an electric field, and a porous or fibrous insulating dust collector provided between the electrode plates and through which the liquid to be purified flows. The inflow side of the liquid to be purified of the dust collector is in contact with one electrode plate and in a non-contact state with the other electrode plate, and the dust collector on the outflow side is in contact with at least the other electrode plate. Electrostatic liquid purification device.