Liquid purification or separation – Flow – fluid pressure or material level – responsive – Float
Patent
1995-07-24
1997-08-26
Drodge, Joseph W.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Float
210241, 210402, 2104161, 210459, B01D 3505, B01D 3501
Patent
active
056607253
DESCRIPTION:
BRIEF SUMMARY
Such a gully emptier is known from German patent specification 30 34 058 which corresponds to U.S. Pat. No. 4,377,475 entitled "Apparatus for Sucking Up and Holding Sludge" issuing to Wiedemann on Mar. 22, 1983, which is herein incorporated by reference. In the gully emptier described therein, water which is carried along in the emptier is sprayed for cleaning, for instance, a sewer. A jet sprays water under high pressure onto the object to be cleaned and is subsequently sucked with the slurry substances removed by such an action into a tank of the gully emptier. In the tank the sucked water is separated from the substances contained therein and is again supplied to the cleaning jet. A discharge pipe provided in the tank for discharging water to be supplied to the cleaning jet is provided with a filter at an end which is liftable and lowerable with the aid of a float so as to separate the coarse particles existing in the tank water. The slurry settles on the bottom of the tank. At a specific level below the water surface, water can be discharged from the tank by taking minimum filtering efforts, since this portion does not contain any substances floating on the water surface, and since the density of the substances depositing downwards under gravitational force is relatively small at a specific height above the settlement layer. To compensate for the gravitational force of the discharge pipes and the filter, the float must have a relatively large size, whereby space is lost for the slurry to be collected and for the cleaning water.
It is the object of the present invention to provide a gully emptier of the above-mentioned type in which the automatic positional mounting of the filter relative to the water surface is improved.
In accordance with the invention, this object is achieved by the compensating springs secured between the tank wall and the filter, the float floating on the water surface can have a considerably smaller size, since the load of the suction pipe is mainly received by the springs and the float just has a control effect. The springs are biased against the gravitational force of the members of the discharge pipe so that the float has only to compensate for a small portion of the gravitational force of the filter and the discharge pipe. The liftable and lowerable end of the outflow line which is provided with the filter is automatically adapted with its height to the changing water surface. This has the advantage that the operating staff need no longer pay attention to the position of the filter in the tank relative to the water surface to readjust the filter in case of need. Since the mechanism for automatically adjusting the filter in its position relative to the water surface is fully within the tank, a vacuum passage through a tank wall on which a guidance lever communicates with the filter is not required. This helps to save costs since such a vacuum passage is relatively expensive to produce and since the reliability of the gully emptier, which is subjected to rough operating conditions, can be increased.
In a special embodiment the float is formed as a rigid hollow body which is connected via a connection to a line extended out of the tank. In this embodiment it can be checked via the line whether the float has been damaged and has become leaky or whether the float can be flooded by supplying water so as to lower the filter to a lower level in the slurry water when substances float on the water surface.
In another preferred embodiment the float consists of a balloon which is filled with gas and consists of a strong flexible material the volume of which can be adjusted in response to the gas filling and which cannot exceed a predetermined maximum volume. As a result, one obtains a variable buoyancy, so that the filter can be held in different positions relative to the water surface. A textile-reinforced plastic sheet is, for instance, suited as a material for such a balloon. Since the maximum volume is defined, a predetermined maximum buoyancy cannot be exceeded even at a variable pre
REFERENCES:
patent: 1343471 (1920-06-01), Otterson
patent: 1345531 (1920-07-01), Cartwright
patent: 2010538 (1935-08-01), Evans
patent: 3013665 (1961-12-01), Schmidt et al.
patent: 4377475 (1983-03-01), Wiedemann
Drodge Joseph W.
Fattibene Arthur T.
Fattibene Paul A.
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