JPH0775686B2 - Electrostatic oil filter - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electrostatic oil purification filter for removing carbon fine particles contained in a lubricating oil of a diesel engine.

[Problems of Prior Art to be Solved by the Invention]

BACKGROUND ART Conventionally, as a means for removing carbon fine particles in a lubricating oil, there is a roll called a roll paper which is mainly composed of Kottton linter pulp. However, such a filter has a problem that the removal rate of carbon fine particles is very low. On the other hand, for example, in Japanese Unexamined Patent Publication No. 58-137452, a filter body constituted by interposing a collection member made of a porous dielectric material between both positive and negative electrodes for the purpose of improving the collection rate. A structure (electrostatic oil purification device) has been proposed. Although the collection ratio is improved by this device, the device is large in size for a diesel engine, and therefore a small-sized oil purifying device having a higher collection ratio is required.

[Means for Solving the Technical Problem] The present invention has been made to answer such a request, in which a spacer member through which contaminated oil flows is disposed on the negative potential side of the electrode and carbon particles are removed from the contaminated oil. The collecting member to be collected is arranged on the positive potential side of the electrode, and the seal member is provided at the position of the collecting member corresponding to the outlet of the spacer member on the downstream side of the contaminated oil.

[Effect of the present invention]

By providing a seal member at a position in the collection member corresponding to the contaminated oil downstream side outlet of the spacer member, separation of carbon deposits deposited on the collection member due to the contaminated oil flow is prevented,
The trapping in the trapping member can be effectively performed, and the carbon in the contaminated oil can be trapped efficiently in a short time.

〔Example〕

FIG. 1 shows the construction of an electrostatic oil purification filtration unit F of the present invention. Reference numerals 1 and 1'represent flat plate electrodes of aluminum foil, to which the positive potential of the DC high voltage source 7 is applied. Reference numeral 2 is also a flat plate electrode of aluminum foil, to which a negative potential is applied. Electrodes 1 and 2
The electrodes 1'and 2 form a pair of electrodes. A porous spacer member 3 made of an electrically insulating material is arranged on the electrode 2 side to which the negative potential of the direct current high voltage source 7 is applied, and contaminated oil flows from upstream to downstream (from the bottom to the top of the drawing). A porous material collecting member 4 is arranged on the side of the electrodes 1 and 1 ′ to which a positive potential is applied, and collects carbon particles from the contaminated oil flowing through the spacer member 3.
5 is a porous dielectric film having fine pores, which is a spacer member 3
And the trapping member 4 are formed between the spacer member 3 and the trapping member 4, and the carbon particles in the contaminated oil are transmitted from the spacer member 3 to the trapping member 4. 6 is a seal member made of silicone rubber or the like, which is provided by a method such as adhesion to the entire downstream end of the spacer member 3 at a position in the collection member 4 corresponding to the vicinity of the contaminated oil downstream side outlet.

The spacer member 3 and the collecting member 4 are made of a relatively coarse porous material such as Kotton linter pulp and wood pulp, and the dielectric film 5 has a pore diameter of several μm and a high dielectric constant such as fluorine resin. Use body.

The electrostatic oil purification unit F shown in FIG.
Are laminated in a roll winding form as shown in FIG. 2 to constitute an electrostatic oil purification filter. The contaminated oil flows in from the upper end direction of the central cylindrical portion of the roll-shaped filter and is ejected from the plurality of openings at the lower end of the filter. This contaminated oil flows in from the lower end side (upstream side) of the filtration unit F and flows out as purified oil from the upper end side (downstream side) outlet.

Since the carbon particles in the contaminated oil are combined with the clean dispersion powder to form a micelle structure and are negatively charged, the carbon particles are attracted toward the positive electrode 1. However, when the dielectric film 5 in the polarized state is contacted, the micelle structure is destroyed, the electric charge of the carbon particles disappears, and the carbon particles start to aggregate. The average particle size of carbon particles grows from 0.4 μm to 1.5 μm. After that, the dielectric film 5 is moved by Brownian motion or the like.
The carbon particles that have permeated through the above are aggregated and deposited on the skeleton of the collection member 4.

The oil downstream side of the collection member 4 is sealed with a seal member 6. However, the negatively charged carbon particles are attracted to the positive electrode side and collect on the collecting member 4, but the cleaning oil, which has been removed from the carbon particles and whose viscosity has been lowered, flows on the spacer member 3 side, so that sealing is performed. Distribution resistance caused by doing so does not pose a particular problem.

The collection performance with the seal member 6 was 40% more than that without the seal member. or,
When the seal member was provided on the oil upstream side, the collection amount was reduced by 10% as compared with the case where the seal member was not provided here. From this result, it was found that providing the seal member on the downstream side of the collecting member is effective in confining the carbon particles.

[Brief description of drawings]

FIG. 1 shows a unit structure of an electrostatic oil purification filter according to the present invention. FIG. 2 shows the overall structure of the electrostatic oil purification filter of the present invention. 1,1 ′ …… Positive electrode 2 …… Negative electrode 3 …… Spacer member 4 …… Collection member 5 …… Dielectric film 6 …… Seal member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP 60-94112 (JP, A) JP 60-106554 (JP, A) JP 60-14956 (JP, A) JP-B 3- 5860 (JP, B2) JP 61-12342 (JP, B2) JP 5-12031 (JP, B2) JP 3-5861 (JP, B2)

Claims (1)

[Claims] 1. A pair of electrodes, which have a positive potential applied to one side and a negative potential applied to the other side and are arranged to face each other, and a spacer member arranged on the negative potential side of the electrodes and through which contaminated oil flows from upstream to downstream. A collecting member arranged on the positive potential side of the electrode for collecting carbon particles from contaminated oil flowing through the spacer member; and the spacer member formed between the spacer member and the collecting member. Electrostatic oil filtration including a dielectric film that allows carbon particles in contaminated oil to permeate the collection member, and a seal member provided at the position of the collection member corresponding to the contaminated oil downstream side outlet of the spacer member. body.