Liquid purification or separation – Serially connected distinct treating with or without storage... – With storage unit
Patent
1990-01-05
1992-04-14
Dawson, Robert A.
Liquid purification or separation
Serially connected distinct treating with or without storage...
With storage unit
210335, 210455, 210472, 422101, B01D 3500
Patent
active
051045338
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention is directed to a filtration unit, especially for medical, microbiological, biochemical, immunological or molecular biology specimens with a specimen-receiving vessel, a filtrate vessel and a filter member containing a filter element arranged between the specimen-receiving vessel and the filtrate vessel, wherein in order to avoid escape of liquid during the filtration process the filtrate vessel is connected with the specimen-receiving vessel by the filter element, however it is sealed towards the outside and possibly the specimen-receiving vessel is also sealed toward the outside.
Such a filtration unit is known (FIGS. 3 to 8 of the DE-A-34 27 114). The filtration in the closed system made poss by this known arrangement has the great advantage, that on the one hand a contamination of the environment by the filtrate as well as by the filtration liquid and the filtered particles deposited upon the filter element is avoided, including a possible contamination and unpleasant odor in the environment caused by escaping gases; on the other hand an impairment of the filtration liquid and the filtrate by pollution from the outside and above all by entry of oxygen contained in air is to begin with avoided The filtration however proceeds quite slowly in many cases in the known arrangement, since the filtrate housing inner space is connected with the specimen-receiving vessel inner space exclusively by the filter element acted upon on its top side by the filtration liquid and is otherwise sealed towards the outside. In the course of the filtration process the filtrate vessel inner space is increasingly filled with filtrate. The hereby displaced quantity of gas, which originally completely filled the filtrate housing inner space, is subjected to the overpressure impeding the filtration process. With the only possible pressure compensation through the filter element and the filtration liquid column resting upon the filter element.
The U.S. Ser. No. 33 00 051 shows a filtration unit, where the specimen-receiving vessel as well as the filtrate vessel are designed with a ventilation aperture discharging into the environment. A liquid escape from the filtrate vessel can therefore not be excluded. The filtrate can also be impaired by pollution from the outside and above all by entry of oxygen contained in the air.
The task of the invention consists in providing for an acceleration of the filtration process by facilitating the pressure compensation in a filtration unit of the previously mentioned type where at least the filtrate vessel is completely sealed toward the outside.
This task is solved by at least one pressure compensation channel which connects a first discharge point in the filtrate vessel inner space above the maximum filtrate level with a second discharge point in the specimen-receiving vessel inner space above the maximum filtration liquid level while bypassing the filtration liquid. The pressure compensation channel provides directly for the desired pressure compensation, wherein the filtrate vessel and if required also the specimen-receiving vessel can be sealed more or less hermetically towards the outside.
In order to at least render more difficult the penetration of filtrate into the respective pressure compensation channel while maintaining simple producibility, it is proposed that the pressure compensation channel be penetrated by a segment of the filter element not covered by filtration liquid. This arrangement is also very favorable from the production technology point of view, since separate recesses for the pressure compensation channel in the filter element are avoided. In a filter element comprising a backup screen for a filtering disk the pressure compensation channel is penetrated merely by the backup screen.
A production technology-wise especially favorable embodiment form of the invention is characterized by designing the side wall of the specimen-receiving vessel to be double-walled and by having the double wall intermediate space form a segment of the at least one p
REFERENCES:
patent: 3300051 (1967-01-01), Mitchell
patent: 3512940 (1970-05-01), Shapiro
patent: 3608736 (1971-09-01), Wong
patent: 3832141 (1974-08-01), Haldopoulos
patent: 4439319 (1984-03-01), Rock
patent: 4485015 (1984-11-01), Smith
patent: 4525276 (1985-06-01), Toda et al.
patent: 4615694 (1986-10-01), Raines
patent: 4675110 (1987-06-01), Fay
Dawson Robert A.
Drodge Joseph
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