Multi-stage eductor apparatus

Abstract

A multi-stage eductor apparatus includes a first stage eductor with an inlet, an outlet, and a venturi throat between the inlet and outlet into which a driving fluid is injected to flow from the outlet and create a suction at the inlet for drawing material into the inlet and through the first stage eductor with the driving fluid, and at least a second stage eductor of the same or similar configuration, with the inlet of the second stage eductor connected directly to the outlet from the first stage eductor, thereby increasing the suction at the inlet to the first stage eductor and maintaining the suction at the inlet to the first stage eductor through a wide range of driving fluid flow rates.

Description

FIELD OF THE INVENTION The present invention generally relates to venturi-type suction devices and apparatus, and in its preferred embodiments more specifically relates to suction and mixing eductor devices and apparatus utilizing a plurality of longitudinally aligned stages. BACKGROUND OF THE INVENTION The venturi tube, which invented by Giovanni Venturi, basically comprises two tapered sections of pipe joined by a narrow throat. This convergent-divergent shape is commonly referred to as a diffuser when used in venturi tubes. As a fluid flows through the venturi tube structure the fluid velocity in the throat is increased and the pressure is reduced, in keeping with the principles of conservation of energy and with Bernoulli's Theory, which states, “At any point in a pipe through which a fluid is flowing the sum of the pressure energy, the kinetic energy, and the potential energy of a given mass of the fluid is constant.” Over time it was realized that the reduced pressure sectio...

AI Technical Summary

Benefits of technology

The present invention provides an eductor apparatus that overcomes the drawbacks inherent in fixed ratio eductors,and which can be effectively used over a wide range of pressures and flow rates. The multi-stage eductor apparatus of the invention includes a first eductor

The structure and features of the eductor apparatus of the invention will be described in more detail with reference to the accompanying drawing figures.

Problems solved by technology

There are several drawbacks associated with eductors known in the prior art.

Eductors are designed to operate effectively within a relatively narrow range of driving fluid pressures and flow rates, and deviation from the design range typically results in substantially reduced performance.

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