JPS5867363A - Electrostatic type liquid purifying device - Google Patents

Abstract

PURPOSE:To decrease the danger of flowing of high voltage current between electrodes and to improve dust precipitation efficiency in the stage of removing the dust, etc. in liquid with dust precipitating bodies between the electrode plates applied with high voltage by setting the associated constitution of the dust precipitating bodies and the electrode plates into specific states. CONSTITUTION:In the stage of purifying the liquid 2 to be purified in a tank 1 by passing the same through the dust collecting bodies 9 in a metallic purifying tank 3, the bodies 9 consisting of porous or fibrous insulators are interposed between high voltage electrode plates 7 and earth side electrode plates 8 to charge the fine dusts in the liquid electrostatically and to absorb the same on the plates 6, 8 or to capture the same with the bodies 9, thereby removing the dusts. In this case, the bodies 21 are constituted of sloped surfaces 22 so that the inflow side of liquid does not contact with the plates 6 or the plates 8. Sloped surfaces 23 are constituted on the opposite side on the outflow side so as to contact with the plates 6 or 8. The conduction of electricity and evolution of heat by an increase in the conductivity of the dust precipitating bodies owing to conductors such as water drops in the liquid are prevented and the capturing efficiency of the dust by the bodies 21 is improved.

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 a one-digit supply pipe installed at the bottom of the septic tank 3 and has a large number of holes 5 that open into the inside of the septic tank 3. The side electrode plate 8 is a ground side electrode plate that forms a counter electrode together with the septic tank 3.9V1 electrode plate 6,
8 O': a porous material V1 interposed between the septic tank 3 and a dust collecting body made of a fibrous insulating material; 10 a support thereof;

11 is a discharge pipe installed in a part of the septic tank 3, 12 is a cover plate,
13 is Parayoung. 14ilJ' This is a storage chamber for coarse dust formed at the bottom of the septic tank 3. 15i1: Tank 1
This is a hose that connects 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, two liquids containing dust are sent from the tank 1 to the hose 16, are sent to the supply pipe 4, enter the septic tank 3 through the hole 5, settle in the coarse dust i1 storage chamber 14, and become fine dust. The liquid containing λ passes between the dust collecting plates 9 and rises. During this time,
Due to the electric field formed inside the septic tank 3, the 1/7 sap contained in the liquid is charged and attracted to the electrode plate 6.8 or the septic tank 3, where it is collected by a dust collector 9. The liquid from which dust has been removed returns to the tank 1 from the discharge pipe 11 through the hose 15.

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

In this conventional configuration, insoluble liquids such as water droplets in oil are also collected on the electrode plate 6.8 or the dust collector 9 and condense, and these liquids accumulate below the dust collector 9 one after another. However, if 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, almost no electric field is formed, and the liquid purification effect disappears. 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 example of Mli according to the present invention will be explained below using FIG. Here, the same part as the conventional one is used. A porous 1/1 or delicate insulating material formed between the electrode plates 6.8: lt/,
-, the dust collector 21 kJ is configured to have an inclined surface 22 so that the inflow side of the liquid to be purified is not connected to the electrode plate 6 or i118. - The outflow side of the strain-relieving purifying liquid is the inflow side] A side surface 23 is configured on the opposite side so as to be in contact with the electrode plate 6 or 8 that was not touched 17.

In this configuration, the liquid to be purified? +fi person, insoluble conductive liquid r1 like water droplets in oil, electrode plate 6,
8 and the dust collector 21. Its concentration is high on the inflow side and low on the outflow side. Conductivity+'l On the inlet side where the liquid concentration is high,
If a porous dust collector is provided in contact with the electrode plates 6 and 8 as in the conventional example, the conduction between the electrode plates will be promoted. Therefore, in the embodiment of the present invention, one electrode plate 6 is provided. Also I'',
] 8 and 1 contact “74・I”: Even if the collected liquid is accumulated on the -1・ side of the dust collector 21, the electrode plate 6.8
Quantity, conduction state does not occur. In addition, on the outflow side, an electrode plate 6 that did not come in contact with the inflow side is installed so that the conductive liquid does not come into contact with the dust collector 21 and flows out of the septic tank 3.
8 and the dust collector 21 are configured so that the liquid to be purified always passes through the porous dust collector 21, so that high collection efficiency can be obtained.

As shown in FIG. 5, depending on the concentration of the conductive liquid at the outflow part, the same effect can be obtained even if the dust collector 21 is provided in contact with both electrode plates 6.8. .8 and the dust collector 21, the same effect can be obtained by using a spacer made of an insulating material instead of the inclined surface 22.23.

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]

Fig. 1 is a cross-sectional view showing the configuration of a conventional electrostatic liquid purifier, Fig. 2 is a cross-sectional view of the main parts, Fig. 3 is a cross-sectional view of the structure of the same electrode plate section, Fig. 4, Fig. 61 Each of the sections 7'L and 7'L is a structural cross section of an electrode plate portion showing an embodiment of the present invention, with a cross section of 1''21. 3... Septic tank, 6.8... Electrode plate, 21
...Dust collector. Name of agent Patent attorney Satoshi Nakao Rij Haga 1 person Figure 1 Figure 3 Figure a2 Figure - ↑ 4 Figure 1 3 Figure 5

Claims (2)

[Claims] (1) Comprising an electrode plate that allows the liquid to be purified to pass through an electric field to collect dust and insoluble liquid, and a porous or fibrous dust collector made of an insulating material provided between the electrode plates; The dust collector on the inflow side of the liquid is in contact with the - 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. . (2) The electrostatic liquid purifier according to claim 1, wherein a non-contact state between the dust collector and the electrode plate is formed by a spacer made of an insulating material.