Fluid handling – Systems – Multi-way valve unit
Patent
1995-11-29
1996-12-17
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
96124, 13762413, F16K 1106
Patent
active
055843220
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a rotary slide valve.
PRIOR ART
Such a rotary slide valve is already known from DE-OS (German Patent Publication) 25 56 097 and is utilized as the control mechanism in an adsorptive pressure exchange process, which is used for the oxygen enrichment of air. Two containers, each containing a zeolite fixed bed, are alternately supplied with air under pressure, so that the zeolite fixed bed in the currently connected container adsorbs the oxygen present in the compressed air, so that oxygen enriched air leaves this zeolite fixed bed. While the container which is connected produces oxygen enriched air, the other container is disconnected and the gas which is retained in the zeolite fixed bed is desorbed. A desorption is necessary because the adsorptive capacity of a zeolite fixed bed is limited, so that a desorption phase must proceed after an adsorption. The known rotary slide valve controls the desorption of the zeolite fixed bed in such manner that, in addition to being disconnected, the zeolite fixed bed is scavenged by the introduction of produced oxygen enriched air and the nitrogen which has been deposited on the zeolite fixed bed is liberated. The known rotary slide valve controls the introduction of the compressed air, the withdrawal of the liberated nitrogen as well as the supply of oxygen enriched air as scavenging air. To this end, the rotary slide valve consists of four control plates having numerous grooves and bores. The disadvantage of this known rotary slide valve resides on the one hand in the complicated and expensive arrangement of several consecutively connected control plates having complicated groove shapes. On the other hand, it is especially disadvantageous that the yield of oxygen enriched air is substantially reduced by the quantity of diverted scavenging air.
From DE-AS (German Patent Publication) 15 44 036 there is known an apparatus for the selective adsorption of gas components in which containers filled with adsorption material are alternately hooked-up by a flat slide valve control. This flat slide valve control consists of two pairs of perforated plates, each pair consisting of one stationary and one rotating perforated plate. In contrast to rotary slide valves, which have a cylindrical component that rotates inside a housing and which has recesses for the control of gas flows in the outer and casing surface, a flat slide valve control consists of exceptionally smooth perforated plates superposed on each other and having grooves or lead-through bores in their top and bottom surfaces. Between the two perforated plate pairs there are located two containers filled with adsorption material, which serve to take up moisture present in air. Both containers are connected to the rotatable perforated plates and are rotated by a driving means. Depending on the positioning of the perforated plates, there occurs adsorption or desorption in the containers, the desorption involving in this case a drying of the containers. The stationary perforated plates have two control slots, each in the shape of an arc of a circle. Because one control slot extends over more than 180.degree., an adjustment is possible in which both containers adsorb simultaneously. This extends the duration of the adsorption phase relative to the desorption phase. Therefore this flat slide valve can be used only for processes in which water vapor is separated from the air, because only in such processes is it possible to desorb the adsorption material in the shortest possible time through the introduction of air at very high temperatures. For adsorption materials such as, for example, zeolite in fixed beds, in which rapid desorption is not possible, this known flat slide valve cannot be used, because it would lead to incomplete desorption of the zeolite fixed beds. It is also a drawback of this known apparatus that not only two perforated plates but also the containers located between them must be rotated. For large, heavy containers this apparatus is therefore scarcely useable.
REFERENCES:
patent: 4038054 (1977-07-01), Graff
patent: 4272265 (1981-06-01), Snyder
patent: 4968334 (1990-11-01), Hilton
patent: 5071453 (1991-12-01), Hradek
patent: 5112367 (1992-05-01), Hill
patent: 5256174 (1993-10-01), Kai et al.
Degenhardt Detlev
Poschl Gunter
Michalsky Gerald A.
PPV Verwaltungs AG
Stapler Alfred
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