US 4,377,475 AGranted

Apparatus for sucking up and holding sludge

OwnerKarl Wiedemanninventor

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Abstract

In the case of an apparatus for sucking up and holding sludge, use is made of a sludge tank which may be evacuated. The sludge tank has a sludge door and a water outlet able to be put into operation separately from the door. The water outlet is made up of an overflow line joined up with water in the sludge tank by way of a filter unit, the filter unit having a cleaning unit with at least one nozzle for jetting water onto the filter unit. Continuous operation is made possible in that the water outlet may be put into operation using a low pressure pump placed between the end of the overflow line, the inlet end at the filter of the overflow line being at a higher level than the low pressure pump, and the inside cross-section of the pump inlet and the inside cross-section of the overflow line are, in each case, greater than the cross-sections, answering thereto, of a pump having atmospheric pressure acting on its inlet side otherwise of the same size and the cleaning unit is designed to be acted upon by filtered water coming from the low pressure pump.

Claims15

Dependent claims

In an apparatus for sucking up and holding sludge, having a suction line opening into a sludge tank on a carriage having a sludge outlet with a sludge outlet door, and a water outlet able to be used separately therefrom, the water outlet having an overflow line with, at an inlet end thereof, a filter unit in the sludge tank, and at least one nozzle cleaning unit for jetting water onto the said filter unit, the invention residing in that said apparatus has a low pressure pump for putting said water outlet into operation, the overflow line running through said pump, the overflow line having an inlet placed at a higher level than said low pressure pump, and said pump having an inner inlet cross-section greater than the inner inlet cross-section of a pump, designed for running with its inlet at atmospheric pressure but otherwise of equal size, in that the cross-section of the part of the overflow duct on the suction side is greater than the inlet of a pump designed for running with its inlet at atmospheric pressure but otherwise of equal size, and in that the low pressure pump is joined up with the cleaning unit for pumping filtered water thereto.

Dependencies are inferred from the claim text.