Liquid suspension purifying unit

Claim 1

A liquid purifying unit, comprising at least one hydrocyclone having a casing enclosing a conically tapering cyclone chamber in whose widest portion or base the inject or the suspension to be purified is passed through an inlet, and two outlets arranged coaxially with the chamber, namely a reject outlet and an accept outlet at the point and base respectively of the cyclone chamber, the hydrocyclone being mounted in an outer housing which by means of upper and lower partition walls is divided into at least three chambers, namely an inject chamber in which the inlet of the hydrocyclone is located, an accept chamber into which the accept outlet of the hydrocyclone discharges, and a reject chamber into which the reject outlet of the hydrocyclone discharges, the hydrocyclone being arranged generally vertically with the accept outlet at the bottom and the reject outlet at the top and discharging into the reject chamber above the liquid level therein so that the reject may flow freely out into air, the widest portion of the casing being joined with a cover element defining therein the accept outlet while the inlet for the inject is arranged in the casing near the cover element, the upper and lower partition walls defining the inject chamber therebetween, the cover element being provided with a boss defining the accept outlet, said boss extending down through an opening the lower partition wall, the upper partition wall being provided with a corresponding opening arranged to allow the passing of the casing and surrounded by a threaded sleeve or pipe stub, the pipe stub cooperating with a threaded retaining member adapted to be screwed onto the pipe stub and to engage in doing so the casing and urge it with its cover element downwardly into engagement with the lower partition wall, and means for maintaining the liquid level in the reject chamber below the elevation of the reject outlet.