JPH0422809Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an oil purifier used to purify oil contaminated with water, metal powder, and other dust.

(Prior art) Conventionally, as a means to purify contaminated oil,
Static precipitation methods, filtration methods, centrifugal separation methods, and electrostatic oil purification methods were known.

Each of the above conventional methods has its own problems, such as, for example, the static precipitation method cannot remove colloidal particles, and the filtration method has more clogging as the mesh size becomes smaller, making maintenance more complicated. Composite machines have been proposed that combine centrifugal separation and electrostatic oil purification (for example, Japanese Patent Publication No. 1983-61460).

(Problem to be solved by the invention) This invention combines a filtration method, a centrifugal separation method, and an electrostatic oil purification method to construct an oil purifier, and makes it possible to purify oil even more completely. The purpose is

(Means for Solving the Problems) That is, the oil purifier of this invention has a separation tank on the upstream side and a filtration tank on the downstream side, and an inverted funnel-shaped electrode is arranged at the center of the upper part of the separation tank. It has been done,
A rectifier for providing a swirling flow is installed inside the electrode and is connected to the supply port, and the separation tank and the filtration tank are communicated through an electrode gap formed through the outer slope of the electrode. It is characterized by

Another oil purifier of this invention is that, in addition to the oil purifier described above, the bottom plate of the separation tank is provided with a detection means for detecting the weight of the sediment deposited on the bottom plate. It is characterized by

(Function) In the oil purifier of this invention, since the oil to be purified first passes through the rectifier, it becomes a swirling flow and flows in the separation tank, where centrifugal separation and electrostatic purification are performed.
Next, when flowing from the separation tank to the filtration tank, electrostatic purification is performed again at the electrode interval provided in the communication section. The oil flowing into the filtration tank is filtered in the filtration tank.

That is, in the oil purifier of this invention, oil to be purified can be treated by three purification means: centrifugal separation, electrostatic oil purification, and filtration.

Water and dust separated in the separation tank are deposited at the bottom of the separation tank. Therefore, in another oil purifier of this invention, the amount of sediment deposited on the bottom can be determined by the detection means provided on the bottom plate for detecting the weight of sediment.

(Example) Hereinafter, an example of this invention will be described with reference to the drawings.

In the figure, 1 is a cylindrical separation tank, and 2 is a cylindrical filtration tank, which are placed above and below with a partition plate 3 in between.

The partition plate 3 is composed of a disc body that also serves as a connecting flange for the separation tank 1 and the filtration tank 2.

This partition plate 3 is provided with various passages. One of them is a passage 5 that communicates the inlet 4 provided on one side of the circumferential surface of the partition plate 3 with the separation tank 1, and extends from the inlet 4 to the center of the lower surface of the partition plate 3.
Another passage is an annular passage 6 provided on the upper side inside the partition plate 3, and the annular passage 6 has four openings provided at equal intervals on the same circumference on the upper surface of the partition plate 3. 7, 7, and, like the passage 5, from a discharge port 8 provided on one side of the circumferential surface of the partition plate 3 toward the center of the partition plate 3,
It communicates with the outside through a passage 9 that extends up to the annular passage 6.

Further, the other passages are four passages 10, 10 provided inside the annular passage 6 at equal intervals on the same circumference and in the thickness direction of the partition plate 3. It is now possible to communicate with each other.

The other passage is a passage 13 located outside the annular passage 6 that communicates an opening 11 provided on the upper surface of the partition plate 3 with a drain port 12 provided on one side of the circumferential surface of the partition plate 3. , like the passages 5 and 9,
It is provided in the radial direction of the partition plate 3 from the drain port 12.

Inside the separation tank 1, an inverted funnel-shaped electrode 1 is inserted into the opening 14 at the bottom center of the partition plate 3 through an insulating cylinder 15.
6 are arranged in series. A rectifier 17 is attached to the inner surface of this electrode 16. The rectifier 17 is an umbrella shaped like an inverted funnel similar to the electrode 16,
A plurality of grooves 18, 18 (4 to 6
) It is arranged in a spiral shape.

On the outside of the electrode 16, a cylinder 19 is provided so as to penetrate through the partition plate 3, and has a diameter such that the passages 10, 10 are on the inside. They are placed facing each other to maintain the same. In the figure, reference numeral 20 denotes a bottom plate installed obliquely at the bottom of the separation tank 1, and a drain port 21 is provided on the side wall of the separation tank 1 facing the lower side.

An elastically deformable plate (for example, an oil-resistant rubber plate) 22 is stretched in the center of the bottom plate 20, and a pressure switch 23 is provided on the lower surface of the plate 22.
is set up opposite. The pressure switch 23 is the adjustment screw 2
4, the plate body 22 can be slightly moved in the direction of the arrow 25, and the detection sensitivity of the deformation of the plate body 22 can be changed.

On the other hand, mesh tubes 26 are installed vertically in the filtration tank 2 (the figure shows a case of four tubes, but this number is free. Usually, one to four tubes are selected). Each mesh tube 26 is
It is installed opposite to the opening 7 formed on the upper surface of the partition plate 3, and an insulating tube 27 is provided at the lower end.
An insulating plate 28 is provided at the upper end. The insulating cylinder 27 at the lower end is fitted into the recess 29 provided in the upper opening 7 of the partition plate 3, while the insulating cylinder 27 at the upper end
8 is pushed down and supported by a lifting plate 32 which is pressed by a spring 31 from a lid plate 30 of the filter tank 2.

In the above embodiment, a negative voltage (24 to 200 volts) is applied to the electrode 16 via a DC power supply (not shown), and the separation tank 1, filtration tank 2, and partition plate 3 are used at ground potential. be done.

Oil to be purified is supplied via a pump from an inlet 4 provided on the circumferential surface of the partition plate 3, and is sent to the rectifier 17 via a passage 5 and an insulating cylinder 15. Rectifier 17
The oil sent to is sent into the separation tank 1 through the spirally provided grooves 18, 18, and as a result flows down to the bottom plate 20 while swirling inside the separation tank 1. At this time, water, dust, etc. contained in the oil are not only centrifugally separated, but also electrostatically separated by the action of the voltage applied to the electrode 16, and sink down to the bottom plate 20 along the side wall of the separation tank 1.

When the oil to be purified is continuously fed, the purified oil passes through the fine gap formed by the electrode 16 and the lower edge of the cylinder 19, passes through the passages 10, 10 of the partition plate 3,
It flows to the filtration tank 2 side.

In this flow process, electrostatic separation is performed again at the finely spaced portions, and dust that has not been separated by the centrifugal separation and electrostatic separation is removed.
The removed dust accumulates on the outer slope of the electrode 16, and as the weight increases due to block formation, it sinks along the slope and eventually settles on the bottom plate 20 of the separation tank 1.

On the other hand, the oil that has flowed into the filter tank 2 via the passages 10, 10 flows inward from the outer walls of the mesh tubes 26, 26, and is discharged to the discharge port 8 via the openings 7, 7 and the annular passage 6.

The oil flowing into the filter tank 2 is oil that has been purified to some extent in the separation tank 1, and is further filtered through the mesh pipes 26, 26, so the oil discharged to the discharge port 8 is almost completely purified oil. can do. Also, mesh tube 2
Since filtration by 6 is carried out on oil that has been purified to some extent on the separation tank 1 side, less dust is sieved, clogging can be prevented for a long period of time, and the frequency of replacement and other maintenance can be reduced. I can do it. Furthermore, since the mesh tube 26 is electrically suspended between the insulating tube 27 and the insulating plate 28, the charged dust tends to migrate to the ground potential side, such as the side wall of the filtration tank 2. 26 can be less clogged.

Water, dust, etc. separated in the separation tank 1 and the filtration tank 2 are deposited at the bottom of each tank. In the separation tank 1, as the amount of water, dust, etc. that accumulates on the bottom plate increases, the plate body 22 deforms toward the pressure switch 23.
can be detected through.

Therefore, an alarm can be issued by operating a lamp, buzzer, etc. via the pressure switch 23.
Since the drain port 12 is usually provided with a valve (not shown), the valve can be opened in response to an alarm to discharge the drain. Alternatively, the valve may be configured to open automatically in place of or in conjunction with the operation of a lamp, buzzer, etc.

Although relatively little dust and the like accumulates on the bottom of the filtration tank 2, it can be discharged to the outside by opening a valve (not shown) of a drain port 21 provided on the partition plate 3.

(Effects of the invention) As explained above, according to the oil purifier of this invention, the oil that has been purified by centrifugal separation and electrostatic separation is further purified by filtration, so that the oil can be completely purified. There is.

Moreover, according to the oil purifier of the invention described in claim 2, in addition to the above-mentioned effects, there is an effect that the amount of water, dust, etc. accumulated at the bottom of the separation tank can be detected from the outside, and the drain can also be automatically discharged.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of this invention, and FIG. 2 is a plan view of the same embodiment with the filter tank removed. 1...Separation tank, 2...Filtering tank, 4...Inlet port,
8...Discharge port, 12, 21...Drain port, 16...
...electrode, 17...rectifier, 18...groove, 20...
Bottom plate, 23...pressure switch, 26...mesh tube.

Claims (1)

[Claims for Utility Model Registration] 1. A separation tank is connected to the upstream side and a filtration tank is connected to the downstream side, and an inverted funnel-shaped electrode is arranged at the center of the upper part of the separation tank. A rectifier for imparting a swirling flow is installed, which is connected to an inlet, and the separation tank and the filtration tank are communicated through an electrode gap formed by an outer slope of the electrode. Oil purifier. 2. The oil purifier according to claim 1, wherein the bottom plate of the separation tank is provided with detection means for detecting the weight of the sediment deposited on the bottom plate.