Liquid purification or separation – Flow – fluid pressure or material level – responsive – Fluid pressure responsive by-pass
Patent
1993-10-14
1996-01-16
Savage, Matthew O.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Fluid pressure responsive by-pass
210149, 210430, 210440, 210442, 210484, 2104971, B01D 35147
Patent
active
054845238
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention concerns an arrangement for a filter for the purification of oil, for example combustion oil, lubricating oil, hydraulic oil or transformer oil from liquid and particulate impurities which are in suspension, said filter being formed of a filter paper, wound into a roll around a stiff core of a liquid-impermeable material, and a housing, surrounding the filter unit, of liquid-impermeable material which is arranged to guide the liquid flow essentially axially through the filter roll from a high pressure side to a low pressure side.
TECHNICAL BACKGROUND
GB 796,475 describes an oil filter which for a long time formed the market standard in the category of lubrication filters. The development in combustion engines has, at least for private cars and trucks, gone in a direction towards engines with higher performance and higher operating temperatures. The requirements on the lubrication oil's quality and the system for purification of the same have also increased accordingly. In many cases the problem is solved with the help of more frequent oil and filter changes. The high quality oil contains many chemical additives which make it expensive to produce and at the same time imply a load on the environment. Used lubrication oil is often destroyed by burning in plants having poor or no cleaning. The normal reason necessitating the change of lubrication oil is that the oil is saturated with fine particles which the engine's filter system is incapable of collecting.
The increased use of hydraulic oil for different systems and arrangements also brings with it a considerable load on the environment, for example when piston seals are damaged by particles in the oil, leading to leaks.
Another field of use for oil is as insulating fluid in transformers. Due to the occurrence of particles and moisture in the oil, arcing can occur in the fluid. The insulating fluid therefore has to be changed or filtered clean at regular intervals.
SE 450 650 describes an arrangement for filtering of combustion oil for diesel engines. The arrangement accomplishes an effective separation of particles and water droplets from the combustion oil but, due to the large flow resistance, this arrangement has a limited field of application.
Present filter arrangements lack the flexibility required to be effective at differing oil temperatures, viscosities and degrees of impurity.
TECHNICAL PROBLEM
An object of the present invention is therefore to achieve a filter arrangement which is more adaptable to different conditions of use than known filter arrangements. Another object is to achieve a highly effective filter arrangement for a broad spectrum of applications.
SOLUTION
This object is achieved according to the invention, in that the core is provided with an internal plug proximate the low pressure side of the filter roll, in that the core presents a number of radial passages between the core interior and the filter roll, and in that the core moreover is provided with at least one openable valve, with the help of which the interior of the core can be put in flow-connection with the filter roll's low pressure side.
The subsequent dependent claims describe different advantageous variants of the arrangement.
DESCRIPTION OF THE FIGURES
An embodiment of the invention will now be described in more detail with reference to the accompanying drawings, in which
FIG. 1 schematically shows a vertical section of a filter arrangement according to a first embodiment of the invention, and
FIG. 2 shows a variation of the filter arrangement depicted in FIG. 1.
PREFERRED EMBODIMENTS
Both figures show a filter arrangement comprising a central filter insert 10, which presents a core 11 of oil-resistant material, around which cellulose paper is tightly wound into a roll 12. This roll is pressed into a filter holder bowl 13 which fits tightly against the roll's enveloping surface, but leaves free play at one end of the roll, which in the figure is the lower end. The other end of the roll is totally open.
The filter in
REFERENCES:
patent: 2522502 (1950-09-01), Clark
patent: 4306966 (1981-12-01), Lucia
patent: 4869820 (1989-09-01), Yee
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