JPS6023004Y2 - electrostatic oil filter - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electrostatic oil filter for removing minute impurities contained in oil by electrical processing.

One method for removing minute impurities contained in oil is through electrical treatment.

This electrical treatment involves installing positive and negative electrodes in the oil, and applying a high DC voltage to these electrodes to create an electric field in the oil, which causes impurities contained in the oil to adhere to the electrode plates through electrophoresis. This is to purify the oil.

An electrostatic oil filter is used to electrically process this oil.

The principle of electrostatic oil purification was invented around 1925, and many patents have been filed since then.

Most of these inventions were related to cleaning oil such as hydraulic oil and insulating oil, and moreover, the oil was cleaned at room temperature.

Automotive engine oil contains additives (mainly dispersants) that increase its conductivity as the temperature rises, and its temperature reaches a high temperature of around 100°C during engine operation.

When engine oil reaches a high temperature of around 100 degrees Celsius, its electrical conductivity reaches about twice as much as it does at 40 degrees Celsius.

When attempting to purify such high-temperature automobile engine oil, the electrical conductivity is high, so the amount of current is several rrL.
A to several tens of A.

In the case of electrostatic oil purification, a voltage of 1 to 10 is usually applied, but as the voltage increases, the amount of current also increases, so the voltage booster becomes large and the power consumption further increases.

Therefore, there are problems in installing such a large elevator and an electrostatic oil filter that consumes a large amount of power in an automobile.

When applying a high voltage of about 10KV to an electrostatic oil filter,
It has high dust collection efficiency and cleanses engine oil several times faster than the rate at which engine oil is contaminated while the car is running.

However, when the voltage is lowered to lower the current, the dust collection efficiency decreases, but moreover, the strength with which minute impurities adhere to the dust collector decreases, causing the impurities collected on the dust collector to solidify. and scatters again.

For this reason, it is necessary to make the voltage as high as possible to firmly fix the impurities to the dust collector.

In view of the above, this invention is for automobiles that can lower the current value without lowering the voltage, and by reducing power consumption, it is possible to use a small voltage booster and save energy consumption. The purpose is to provide an electrostatic filter.

Next, this invention will be explained based on embodiments shown in the drawings.

In FIG. 1 and FIG. 2, this electrode (hereinafter referred to as the outer electrode) is located inside a bottomed cylindrical electrode 1 that also serves as the container wall of the electrostatic oil filter.

) 1 is provided concentrically with a cylindrical inner electrode 2 having a smaller diameter than this electrode 1.

The inner electrode 2 has small holes 3 for guiding current and oil flow.
A plurality of cylindrical lower insulators 4 are inserted into the bottom plate 1a of the outer electrode 1.

The upper part of the inner electrode 2 is in contact with the lid 7 through the upper insulator 5, and a portion thereof projects above the lid 7 through the insulator 6.

The outer electrode 1 is grounded by a wire 8, and the protrusion 2a of the inner electrode 2 is connected to one pole of a DC power source 10 by a wire 9.

Inside the outer electrode 1 is a cylindrical filter paper tube 11 for collecting dust.
is arranged with a slight gap A between it and the outer electrode 1, and there is a gap B between the filter paper tube 11 and the lower surface of the lid 7.

On the outside of the inner electrode 2, a cylindrical insulating tube 12 is provided concentrically with respect to the inner electrode 2.

The lower end of the insulating cylinder 12 is attached to the bottom plate 1a of the outer electrode 1 in close contact, and a gap larger than the gap B is provided between the upper end and the lower surface of the lid 7.

The insulating cylinder 12 is made of polypropylene resin, and has an appropriate number of small holes 13 for passing oil and electric current.

The small holes 13 in this embodiment have a diameter of about 2 mm, and are drilled at a rate of one hole per 100 crK of the insulating cylinder 12.

The lid 7 has an oil inlet 14 in its center, and an oil outlet 15 on the side of the inlet 14.

In the electrostatic filter having the above configuration, the DC power supply 1
When a current flows from zero to inner electrode 2, an electric field is formed between inner electrode 2 and outer electrode 1.

Next, when oil is allowed to flow in from the inlet 14, the oil flows out through each small hole 3 of the inner electrode 2 and flows out from each small hole 13 of the insulating cylinder 12 and the upper end of the insulating cylinder 12 as shown by the arrow. As shown in , it flows out to the outside of the insulating cylinder 12 .

Then, the oil that has leaked out to the outside of the insulating tube 12 is
As shown in , it rises between the insulating tube 12 and the filter paper tube 11 and flows out through the outlet 15 to the outside.

When the oil flows out from the inner electrode 2, it is exposed to an electric field formed between the inner electrode 2 and the outer electrode 3, so that the fine particles contained in the oil are absorbed by the filter paper cylinder 11 and purified.

When the electrostatic oil filter of this example was installed in a diesel engine and tested, the small holes 13 made in the insulating tube 12 acted as resistance to the current and oil flow, and the current value was lower than that in the case without the insulating tube 12. It decreased by about 50%.

Next, instead of polypropylene, the material of the insulating cylinder 12 in the first embodiment is made of a resin such as polyester, polycarbonate, nylon, Teflon, or ABS (acrylic nitrile-butadiene-styrene terpolymer). A test was conducted, and the results were similar to those of the first example.

Next, without making the small hole 13 in the insulating cylinder 12 of the first embodiment,
All other items were tested in the same manner as in the first example.

The current value in this case was 75% lower than the current value without the insulating tube 12.

In each of the above examples, although the oil purification speed decreased as the current value decreased, the cleanliness of the oil was maintained because it was faster than the oil contamination speed due to engine operation.

Further, the degree of adhesion of the fine particles to the filter paper tube 11 was good, and the amount of fine particles that were re-dispersed after being fixed did not increase.

As described above, this invention is based on an electrostatic oil filter for automobiles having a cylindrical outer electrode and a cylindrical inner electrode arranged concentrically inside the outer electrode. By arranging a cylindrical insulator and a cylindrical filter paper cylinder inside the outer electrode concentrically with respect to each electrode, the following effects can be obtained.

(1) Power consumption can be reduced compared to conventional methods.

(2) Due to the reason in (1), a small voltage elevator can be used, and it can be used as an oil filter mounted on a car or the like.

(3) Since the power consumption is small, the electrode area can be increased and the impurity retention capacity can be increased.

(4) Even if particulate matter adheres to the filter paper tube or its function deteriorates, it can be replaced extremely easily.

[Brief explanation of the drawing]

The figures show an embodiment of this invention, in which FIG. 1 is a longitudinal cross-sectional view of an electrostatic oil filter, and FIG. 1...Outer electrode, 2...Inner electrode, 1
2...Insulating cylinder, 13...Small hole.

Claims (1)

[Scope of utility model registration request] It has a bottomed cylindrical container that contains oil and also serves as an outer electrode, and a cylindrical inner electrode that is arranged concentrically with respect to the container within this container, and a DC voltage is applied to this inner electrode. This is an electrostatic oil filter for automobiles that forms an electric field in oil to collect particulate matter contained in the oil toward an outer electrode and remove it. An electrostatic oil filter characterized in that a cylindrical filter paper tube is arranged concentrically with respect to each electrode inside the outer electrode.