Method of reducing pressure drop during the passage of a fluid,

Details Method of reducing pressure drop during the passage of a fluid, Method of reducing pressure drop during the passage of a fluid,

1990-08-02

1991-09-24

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55 48, 55185, 55201, 55309, 55338, B01D 1900

Patent

active

050511165

DESCRIPTION:

BRIEF SUMMARY
FIELD OF INVENTION

The present invention relates to a method of reducing pressure drop in the passage of a fluid across a fine-mesh net structure, for the purpose of extracting gas from the fluid, e.g. when starting-up mobile hydraulic systems, preferably in the case of repeated passage of the fluid through the net structure.
The invention also relates to a reservoir intended for use in fluid-circulating hydraulic-systems and being equipped with an air separator.
Effective separation of air from the working fluid of a hydraulic system will reduce the amount of input energy required by the system and will also improve the precision at which the system operates. In order for air and other forms of gas to be separated effectively from hydraulic systems, it is normally necessary to ensure that the rate of flow through the system reservoirs is so slow as to afford time for the air bubbles, or gas bubbles, to rise to the liquid surface of the reservoirs thereof, which means that large reservoirs are required. However, the space available for the inclusion of reservoirs in such systems is often limited, and consequently it is necessary to solve the problem of air separation in some other manner; this problem is accentuated when the reservoir volume is reduced and the fluid through flow rate increased.


BACKGROUND PRIOR ART

For the purpose of extracting air effectively from fluid which passes through the reservoir of a hydraulic system at elevated rates of flow, it has been proposed to position a fine-mesh net structure between two mutually opposite corners of the reservoir, with the net structure arranged in an inclined position.
The results of trials carried out with the aid of such a net structure have shown that, in addition to flow rate, the ability to separate air effectively from hydraulic fluids is also contingent on the viscosity of the fluid concerned, the angle at which the net structure is inclined and the fineness of the mesh.
Since in the case of closed systems the oil, or hydraulic fluid, will pass through the net structure several times, air separation will approach a final value asymptotically. This final value will be higher with increasing mesh fineness, since the air bubbles are divided in accordance with size.
Consequently, in order to separate air effectively, it is necessary to use a net of vary fine mesh. However, the pressure drop across fine-mesh net structures is higher than in other cases, particularly when cold-starting mobile hydraulic systems, in which a small reservoir is desirable for several reasons. In practice, the high viscous fluid therethrough, a situation which is quite normal with the cold-start of hydraulic systems, will result in problems of such gravity that other solutions must be sought.
Those solutions proposed hitherto, however, have been both expensive and complicated and have not taken into account the fact that a fine-mesh net structure constitutes and effective means for separating gas from a continuously operating hydraulic system, i.e. subsequent to solving cold-start problems.
Solutions hitherto proposed which recommend the use of different types of pressure limiters comprising moveable components can cause cavitation problems and result in unsatisfactory gas separation.


OBJECT OF THE INVENTION

The object of the present invention is to avoid the aforesaid drawbacks and the invention, to this end, is based on the realization that since the fluid circulates in the hydraulic system, it is not necessary to extract all air at one and the same time, i.e. 100% extraction, but that the air can equally as well be extracted successively as the system departs from the abnormal conditions which prevail in the case of cold-starts.
One object of the invention in accordance herewith is to provide a method of the aforesaid kind which will enable a fine-mesh net structure to be used in a reservoir of small volume while avoiding the problems occurring when cold-starting such systems.
Another object is to provide a method of the aforesaid kind which avoids the use of movea

REFERENCES:
patent: 4483697 (1984-11-01), Deysson et al.
patent: 4783266 (1988-11-01), Titch et al.

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