Fluid handling – Diverse fluid containing pressure systems – Fluid separating traps or vents
Patent
1991-01-11
1992-06-30
Cohan, Alan
Fluid handling
Diverse fluid containing pressure systems
Fluid separating traps or vents
210188, B01D 1900
Patent
active
051254280
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a pressure compensator and the point of departure is the vents with filter inserts for polluted environments that prevent oil ejection from the housing in the pressure compensation. Pressure compensators with filter inserts such as known from FR 2,414,849 still have the disadvantage that no discharge without lubricant ejection and no absorption without gradual penetration of dirt are possible. Therefore, they require, strictly speaking, very frequent servicing. Such pressure compensators are mostly known as insert bodies screwable in the wall of the machine housings in which a felt or a fabric is secured under a cover plate leaving free a breathing gap.
The oil mist that has been discharged upon heating and then deposits in the environment area not infrequently simulates a leakage. In an oil-soaked, stickily smudgy environment heavy accumulations of dirt promptly result and the ventilation gap can finally become fully clogged. The collapse of the ventilation function associated therewith then leads to a certain overpressure in the machine housing and, consequently, to destruction of the filter or to intolerable, real heavy losses of oil through other openings of the housing. It easily occurs then that shaft seals, etc., act as valves since they have not been designed for over pressurization.
With such conventional pressure compensators, whose parts consist of separator components and filter material, there also is not obtained any reliable water tightness such as needed when using tractors in rice fields or in other machines to be used under water in order to eliminate the inrush of water in the machine housing. Defective or lacking maintenance often results in the breakdown of such pressure compensators that seem to be so simple themselves.
EP-A-01 55 115 also shows that discharges of liquid can be prevented, in the meantime, while maintaining the capacity for breathing with an apparatus for ventilating pipes, fermentation containers, etc., with which, aided by a water-tight diaphragm material known per se, the exit of liquid can be prevented. Here a filter is employed which uses in combination a gas-pervious and water-tight plastic diaphragm and a protective base pervious to gas and water, in order to protect the diaphragm against overpressure on the side of the liquid. Synthetic fleece, foam and fabric, dry powdered metal, ceramic and wire screens have been mentioned as materials for said base directly associated with the diaphragm. It has also been proposed here to join the diaphragm and the base with each other by means of a plastic border.
However, said construction of the ventilation is still not suited for machine housings. The above explained blockage problem subsists, since mud and dust accumulations which hinder the pressure compensator from recirculating clean air, for example, when the machine housing is cleaned still can enter from the outside. The exclusively provided stiff arrangement of the diaphragm and the base in the respirator body is in particular inadequate for keeping the diaphragm free of blockage without maintenance even when the air side of the pressure compensator is heavily loaded with dirt.
The problem to be solved by the invention is to provide pressure compensators for machine housings that are really liquid-tight and no longer discharge oil mist, and which, in rough outer operation and with heavy dirt in the external area, clearly have longer serviceability and normally do not require any more maintenance expense since, on one hand, at low construction cost they are in both directions pervious to air and gas, but as completely as possible are no longer pervious to oil or water and, on the other hand, they also are self-cleaning.
This problem is solved with the pressure compensator essentially by the fact that a material known from water pipe vents, etc., is now used for a conveniently designed preventer of lubricant discharge. The liquid-tight but highly gas-pervious diaphragm is flexibly designed from an extremely thin, microporose synthetic foil joi
REFERENCES:
patent: 3326230 (1967-06-01), Frank
patent: 4319996 (1982-03-01), Vincent
Cohan Alan
Zahnradfabrik Friedrichshafen AG
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