GB2129436A

GB2129436A - Oil purifying apparatus

Info

Publication number: GB2129436A
Application number: GB08231397A
Authority: GB
Inventors: Yi-Shong Chia
Original assignee: CHIA YI SHONG
Current assignee: CHIA YI SHONG
Priority date: 1982-11-03
Filing date: 1982-11-03
Publication date: 1984-05-16

Abstract

An oil purifying apparatus comprising a pump (4) for circulating oil through the apparatus, a first filter (2) for removing large particulate impurities at a first inlet stage (43) in the apparatus and which may be readily cleaned, a duct (25, 14) leading from said first filter (2) into an oil purifying tank (1) comprising a first portion wherein at least one oil filter member is located for a second stage filtration and has an outlet duct leading to a second tank portion containing positive and negative plates of an electrostatic separating device for removing small particulate material from the oil with said purifying second tank portion having means (16) for removal of small separated precipitated particulate material and an oil outlet duct (19) from said second tank portion (12) for return of the oil to a main oil supply tank. <IMAGE>

Description

SPECIFICATION Oil purifying apparatus The present invention relates to an improved oil purifying apparatus which is intended to be more effective than hitherto devices and provide a design for saving energy.

According to the present invention there is provided an oil purifying apparatus comprising a pump for circulating oil through the apparatus, a first filter for removing large particulate impurities at a first inlet stage in the apparatus and which may be readily cleaned, a duct leading from said first filter into an oil purifying tank comprising a first portion where at least one oil filter member is located from a second stage filtration and has an outlet duct leading to a second tank portion containing positive and negative plates of an electrostatic separating device for removing small particulate material from the oil with said purifying tank portion having means for removal of small separated precipitated particulate material, and an oil outlet duct from said second tank portion for return of the oil to a main oil supply tank.

The oil purifying apparatus firstly filters larger particulate impurities from oil by a coarse filter, then oil is again filtered through one or more filter cylinders of the filter tank in the oil-purifying tank, and finally the oil is treated with the uniformly arranged electroplates for electrostatic separation treatment and small particles accumulate into larger particles and drop to the bottom of tank under the action of gravity and are drained off through drain valve and purified oil is returned to mechanical oil tank. The purified oil is again pumped and above-mentioned purifying procedure carried out again by circulation many times to purify impure oil.

The invention will be described further, by way of example, with reference to the accompanying drawings in which~ Fig. 1-1 is a perspective view from above and one side of an oil purifying apparatus according to the invention; Fig. 1-2 is a perspective view from an opposite side of a portion of the apparatus Fig.

1-1; Fig. 2 is a schematic section through a first filter of the apparatus; Fig. 3 is a perspective view of an oil purifying tank of the apparatus with wall portions cut away to show the interior of the tank; Fig. 4 is a circuit diagram of the electric control circuit of the apparatus; and Fig. 5 is a flow diagram of the circulation path for oil being purified and showing the recycling path.

The apparatus illustrated in the prespective view of Fig. 1-1 comprises an oil purifying tank 1, a filter 2 with a casing of transparent material, an electrical control unit or box 3, and a circulating pump 4 all mounted on base support member 5 having a wheel 51 at each corner.

The filter unit 2 (see Fig. 2) comprises a hollow filter cylinder 21 having a central aperture 22 along which filtered oil passes to oil outlet duct 27. The filter cylinder 21 is mounted on base member 23 via a rubber washer 24. The rubber washer 24 is placed at the contacting region between the cylinder 21 and base seat member 23 to prevent unfiltered oil from entering directly into the central aperture 22 of the filter member 21. Unfiltered oil enters via a transparent steel wire plastics tube 25 and oil inlet duct 26 of the filter and passes upward between the outer casing of the filter unit 2 which is secured via screw thread 28 on base member 23.The filter casing is made of transparent material and therefore the distribution of impurities in the unfiltered oil in this unit can be readily viewed and the unit may be readily cleaned or the filter cylinder replaced by unscrewing the housing from threaded portion 28.

The filter cylinder 21 may be made of fiber material, paper material or tar felt and is useful for filtering the larger particles or impurities and enables the thus filtered oil to pass into the central hollow duct 22 to the oil outlet 27 which is connected with oil pipe 14 leading to the oil purifying tank 1.

The filter cylinder 21 in the filter as shown in Fig. 2 is used for filtering the larger particle impurities from the oil and the thus filtered less impure oil passes into central aperture 22 and then through oil pipe 14 into the filter tank 11 of the oil purifying tank 1 as shown in Fig. 3 and is filtered by one or more filter cylinders 111 to obtain a more purified oil.

The oil purifying tank 1 comprises a filter tank 11 containing filter cylinders 111 (Fig.3) mounted on base seat members 112 and each have a cover 113 preventing the direct flow of oil into the central aperture 114 thereof and thus ensuring the oil passes through the filter member to reach the outlet thereof. Thus the oil initially filtered by filter 2 passes into the filter tank 11 through duct 14 and passes through the filter members 111 to an oil conservator or receiving chamber 13 which has a communicating aperture 15 leading to electrostatic separating tank 12 for further electrostatic purification of the filtered oil.Within the electrostatic separating tank 12 there are positive electrostatic plates 121 and negative electrostatic plates 122 suitably disposed in interlaced pattern and so as to effect electrostatic separation of impurities from the oil which is caused to flow therepast. Whence travelling to the purified oil outlet 1 9 (Fig. 1) of the electrostatic separating tank 12 a drain valve 16 is provided in the tank 12 and an oil sampling outlet 17 is also provided. Furthermore, as will also be apparent from Fig. 1, an oil pressure gauge 18 is provided in communication with the electrostatic separating tank 12.

In Fig. 1-2 there is illustrated electrical appliance box 3 having a transformer for transforming the supply into high voltage which is fed via high voltage transmission line 33 and insulated conduit coupling 34 into the oil purifying tank 1 and to the positive plate 121 of the electrostatic separating plates. The terminal box 32 is used for connection of the electric power supply lead 42 and the input of 3#AC220 and 31 is a buzzer.

In Fig. 4 of the drawings the control circuit of the device is illustrated. The circuit has a 3 phase AC 220V supply driving pump P via 3-3 position switches S.Sz. HVT is the high voltage transmission. If the apparatus is full of water between positive and negative plates, high voltage transmission (HVT) must be cut automatically and buzzer 31 produces an alarm signal after a few seconds (this is set by time-limit relay T) and restore to supply high voltage transmission to provide a protective purpose. At this time it is intended that the overfilled water is automatically drained-off, if not, the buzzer will continue to ring and the overfilled water will be artificially drainedoff.

In Fig. 1-2 the general components of the electric control are illustrated and comprise a buzzer 31, a terminal block 32 and a high voltage transmission line 33 leading to an insulating conduit coupling 34.

A bulk oil or mechanical oil tank 6 is shown in Fig. 5 connected to the apparatus of the invention via unfiltered oil inlet duct 43 leading to pump 4 which has an outlet duct 44 comprised of a transparent steel wire plastics tube 25 leading to inlet base member 23 of filter 2. The motor 4 is provided with electrical distribution board or box 41 and electrical power supply leads 42.

In operation, oil from the mechanical oil tank 6 is pumped by pump 4 from duct 43 through duct 44 into the filter 2 and passes through the filter cylinder 21 and central duct 22 thereof via ducts 27 and 14 into the filter tank portion 1 1 of the oil purifying tank 1 and passes through the filter cylinders 1 1 1 into the oil conservator or receiving chamber 13 and then, via aperture 15, into the electrostatic separating tank 12. The positive plate 121 and negative plate 122 are supplied with high voltage transmission for the electrostatic separating treatment and the small particles which accumulate thereon into larger particles, drop to the bottom of the tank. The impure oil and residue are precipitated and over a period mount up and may be drained away via oil drain valve 16.When the purified oil rises it leaves the tank 12 through the outlet 19 and is returned to the tank 6 for recycling via pump 4 through the oil purifying apparatus and this circulation system is illustrated in Fig. 5. The oil may be circulated many times in order to completely purify the oil in the tank 6.

The oil pressure gauge 18 is provided to indicate the oil pressure in the filter tank 11 so that the flow might be controlled. Outlet 17 is provided for oil sampling to enable oil to be removed from tank 11 to determine at any time whether or not the filter cylinder needs to be cleaned.

THE MERITS OF THE INVENTION ARE: 1. Utilization of the principle of purifying oil by electrostatic precipitation method to collect the contaminating material in the oil and inhibit the oxidation of oil and extend the useful life of the oil and reduce trouble of oil pressure system elements.

2. The provision of the part which is controlled by the input of a high voltage static transformer as a whole structure with transformer and which possesses return design which can conduct and cut electric power supply instantly and restore after second. Therefore, if a short-circuit should occur a buzzer produces a long and continuous alarm for maintenance personnel.

3. At the outlet end of the pump there is assembled a filter which is equipped with preferably a transparent acrylic fiber case and is provided to prevent larger granules or particles of contaminating material from going directly into oil purifying tank to increase purifying speed and which permits the examination of the blocking or deposit situation of contaminating material through transparent case and the draining off of contaminating material as needed.

4. The inlet of oil is achieved by a speed conduit coupling in order to assemble and disassemble.

The oil suction or drain pipes are made of steel wire reinforced transparent plastics pipe to permit inspection of the purification of input or output oil.

Claims

1. An oil purifying apparatus comprising a pump for circulating oil through the apparatus, a first filter for removing large particulate impurities at a first inlet stage in the apparatus and which may be readily cleaned, a duct leading from said first filter into an oil purifying tank comprising a first portion wherein at least one oil filter member is located for a second stage filtration and has an outlet duct leading to a second tank portion containing positive and negative plates of an electrostatic separating device for removing small particulate material from the oil with said purifying second tank portion having means for removal of small separated precipitated particulate material, and an oil outlet duct from said second tank portion for return of the oil to a main oil supply tank.

2. An oil purifying apparatus substantially as herein described with reference to and as illustrated in the accompanying drawings.