JPS58903B2 - Liquid electrostatic purification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for eliminating contaminants (
This invention relates to an electrostatic purification device for liquids that electrically separates and removes moisture (including moisture).

Electrostatic purification devices for liquids that electrically separate contaminants in insulating liquids and suction-treat them with dust collectors are already known, but all of these devices are separate from the machine's oil tank or hydraulic circuit. Since it is an independent device, it requires a pump, piping, etc. to introduce contaminated liquid into the electrostatic purification device, which has the disadvantage of increasing equipment costs.

The present invention obviates the above-mentioned drawbacks.

It is an object of the present invention to provide a liquid electrostatic purification device that can purify an insulating liquid in a liquid tank without using the above-mentioned pump or piping.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a diagram illustrating the outline of a liquid electrostatic purification device according to the present invention, FIG. 2 is a longitudinal cross-sectional view of a first embodiment of a purification chamber according to the present invention, and FIG. 3 is a diagram taken along A-A in FIG. 4 is a perspective view of the electrode plate, FIG. 5 is a longitudinal sectional view of the second embodiment of the purification chamber according to the present invention, and FIG. 6 is a cross-sectional view taken along the line A-- FIG. 3 is a cross-sectional view taken along line A'.

In Fig. 1, 1 is the oil tank of the machine, and 2 is the pump.

3 indicates a hydraulic circuit, and 4 indicates a purification chamber.

The oil stored in the oil tank 1 of the machine is sent to the hydraulic circuit 3 by a pump, and constantly circulates while flowing back into the oil tank 1 in the direction of the arrow.

The hydraulic circuit 3 is a complicated circuit composed of pistons, valves, etc.

In this, oil not only acts as a medium of force, but also lubricates friction surfaces, allowing the machine to operate smoothly.

In this hydraulic circuit 3, the oil temperature increases due to work heat, frictional heat, etc., and in addition, wear particles and cooling water get mixed in.
Oxidative deterioration of the oil is promoted, leading to significant oil contamination.
Eventually, a lubrication failure occurred.

Hydraulic circuit 3 malfunctions.

Therefore, in the prior art, this contaminated oil is periodically replaced with fresh oil.

In the present invention, a rectangular purification chamber 4 is provided projecting from one side of the oil tank 1, contaminated oil is introduced into this chamber, and the oil is purified by the action of static electricity.

Generally, the oil temperature in the oil tank 1 reaches 40 to 80 degrees Celsius,
The outside temperature ranges from 5 to 30 degrees Celsius, and the temperature difference often exceeds 20 degrees Celsius.

Since the purification chamber 4 protrudes from the side wall of the oil tank 1, it is cooled and a convection current is generated in the oil tank 1 as shown by the arrow.

In addition, by attaching cooling fins to the outer periphery of the purification chamber 4,
It is possible to further increase the cooling effect.

In FIG. 1, the left side is a source of heat generation and pollution, and the right side is a heat dissipation and purification section, resulting in a pair of convection currents indicated by arrows.

The oil delivery port to the hydraulic circuit 3 is provided near the bottom of the oil tank, but the discharge recirculation port is located closer to the purification chamber 4 than the center of the oil tank 1, and is arranged so that the oil is discharged upward. It has become.

By configuring the reflux port in this manner, convection due to the temperature difference is promoted, and all of the contaminants in the oil tank 1 are captured in the purification chamber 4 without settling.

2 and 3 show an embodiment of the purification chamber according to the present invention, in which 5 is an electrode plate, 6 is a dust collector, γ is a dust collection chamber, 8 is a dust collector holding plate, and 9 is a dust collector. is the drain valve, 10
is the upper lid, 11 is the electrode plate addition part, 12 is the insulator, 13 and 14
15 is a sharp end, 15 is a partition wall, 16 is contaminated oil, 17 is a high-voltage conductor, and 18 is a wall of the dirt chamber γ.

The purification chamber 4 is sealed with an upper lid 10, an insulator 12 is attached to the upper lid 10, a high-voltage electrode plate 5 is fixed to the end thereof by an electrode plate extension part 11, and a conductive wire 17 passing through the insulator 12 is attached to the electrode plate 5. is connected to a negative high voltage power supply (not shown).

A side wall of the purification chamber 4 is grounded, and this side wall also serves as a positive electrode.

The high voltage electrode plate 5 is held parallel to the side wall of the purification chamber 4 and the partition wall 15.

The side wall of this purification chamber 4 is made of metal and is grounded.

A pair of negative and negative electrodes is formed by the side wall of the purification chamber 4 and the electrode plate 5, and a porous insulating dust collector 6 such as nylon fiber is interposed between them.

There is a dust collection chamber 7 below the dust collection body 6, and the dust collection body 6 has an insulating dust collection body holding plate 8 supported on the wall 18 of the dust collection chamber 7.
It is placed on top of.

When a voltage of about 10 KV is applied to the high-voltage electrode plate 5 to generate an electric field, high-speed ions are generated toward the ground electrode because the upper and lower ends of the high-voltage electrode plate 5 have sharp edges.
This blows away oil and dirt, creating a flow in the direction of the arrow in FIG.

This flow is also caused by the temperature difference between the oil in the purification chamber 4 and the oil in the oil tank body 1, but is further promoted by the generation of high-speed ions described above.

As shown in FIG. 2, near the upper end of the electrode plate 5, this flow collides with the side wall of the purification chamber 4 and is divided into an upward direction and a downward direction, and the dust contained in the downward direction is collected. While passing through the dust body 6, it is captured by the fibers of the dust collector 6,
The cleaned oil passes between the electrode plate 5 and the dust collector holding plate 8 and flows back into the oil tank 1.

FIG. 8 is a perspective view of the electrode plate 5, in which serrated sharp edges 13 and 14 are added to the upper and lower ends of the electrode plate 5.

The sharp end 13 faces the side wall of the purification chamber 4, and the sharp end 14 faces the partition wall 15.

In this way, ions are more strongly ejected from the upper and lower ends of the electrode plate 5, increasing the oil flow speed in the direction shown by the arrow, and the flow rate is about three times that of the case without these ions, so the amount of contaminated oil brought in is increased. is increased, and the dust collection performance is further improved.

The dust and water trapped in the dust collecting body 6 gradually aggregate into large particles, and most of them settle and are collected in the dust collection chamber 7.

A part of the contaminants settles to the bottom between the wall 18 and the partition wall 15 of the waste storage chamber 7, but the partition wall 15 prevents the contaminants from flowing into the oil tank body.

In this way, the dirt and moisture in the oil tank 1 and the hydraulic circuit 3 are gradually collected in the dust collector 6 and the dirt chamber 7, and the entire oil is constantly cleaned.

These dust and water are removed by periodically opening the top cover 10 and replacing the dust collector 6, or by opening the drain valve.

5 and 6 show a second embodiment of the purification chamber 4, in which 8' indicates an insulating holding plate, and 19 indicates a space between the electrode plate 5 and the dust collector 6, respectively. .

Note that the same reference numerals as in FIGS. 1 to 4 indicate the same parts.

The second embodiment is suitable when a large amount of water is mixed in the oil.

As shown in FIG. 5, in the second embodiment, the dust collector 6 is placed on a wall 18 and is reliably separated from the high voltage electrode plate 5 by insulating holding plates 8, 8'.

In the second embodiment, the oil flowing into the purification chamber 4 is
9 and plays a role of isolating the high voltage electrode plate 5 and the dust collector 6.

The second embodiment is particularly effective when applied to cleaning oil mixed with cooling water, etc., and since the high-voltage electrode plate 5 and the dust collector 6 do not come into contact with each other, the dust collector 6 Even if the material contains moisture, stable processing can be continued for a long period of time without causing short-circuit phenomena.

As is clear from the above description, according to the present invention, the purification chamber is constructed using a part of the oil tank of the machine.
The pumps and piping required in the prior art are not required, and the oil in the oil tank of the machine can be cleaned economically.

Further, according to the present invention, since the amount of contaminated oil carried into the purification chamber is increased by electrical action, the dust collection performance can be significantly improved.

As a result, if the present invention is adopted, the regular oil change cycle will be significantly extended, and not only will oil be saved, but also machine accuracy will be improved, machine life will be extended, and downtime losses will be eliminated.
It greatly contributes to resource and energy conservation.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating the outline of a liquid electrostatic purification device according to the present invention, FIG. 2 is a longitudinal cross-sectional view of a first embodiment of a purification chamber according to the present invention, and FIG. 3 is a diagram taken along A-A in FIG. 4 is a perspective view of the electrode plate, FIG. 5 is a longitudinal sectional view of the second embodiment of the purification chamber according to the present invention, and FIG. 6 is a cross-sectional view taken along the line A-- A' line (this is a cross-sectional view cut along this line. 1... Machine oil tank, 2...-pump, 3
...Hydraulic circuit, 4...Purification chamber, 5...
... Electrode plate, 6 ... Dust collector, T ...
- Garbage chamber, 8... Dust collector holding plate, 8'...
... Insulating holding plate, 9 ... Drain valve, 10 ... Top cover, 11 ... Electrode plate mounting part, 12 ... Insulator. 13 and 14...Sharp end, 15...Dividing wall, 16...Contaminated oil, 1γ...High voltage conductor, 18...Garbage Wall of reservoir T, 19...
...Space between the electrode plate 5 and the dust collector 6.

Claims (1)

[Claims] 1. In an electrostatic purification device for a liquid in which an electric field is formed by opposing negative and negative electrodes and contaminants in the liquid are removed while the liquid is passed between them, a purification chamber is protruded from the side wall of the liquid tank. and providing the electrode plate by immersing it in the liquid so that a liquid passage exists between the upper surface of the purification chamber and the upper end of the electrode plate and between the lower surface of the purification chamber and the lower end of the electrode plate, At the upper end of the electrode plate, electric lines of force are generated in the opposite direction from the liquid tank to the purification chamber, and at the lower end of the electrode plate, electric lines of force are generated in the opposite direction from the purification chamber to the liquid tank. Lines of electric force are generated, and at the upper end of the electrode plate, the liquid is caused to flow into the space formed by the electrode plate and the side wall of the purification chamber using electric force. An electrostatic purification device for liquid, characterized in that the liquid is caused to flow toward the liquid tank by electric force at the lower end of the electrode plate. 2 A sharp end is formed at the upper end of the electrode plate in the same direction as the direction from the liquid tank to the purification chamber, and a sharp end is formed at the lower end of the electrode plate in the same direction as the direction from the purification chamber to the liquid tank. An electrostatic purification device for liquid according to claim 1, characterized in that: 3. The electrostatic charge of the liquid according to claim 1 or 2, characterized in that a portion having a positive potential with respect to the electrode plate is provided on the front surface of the lower end of the electrode plate on the side of the liquid tank. Purification device.