Agitating – Stirrer within stationary mixing chamber – Pump type
Patent
1997-02-24
1999-10-05
Cooley, Charles E.
Agitating
Stirrer within stationary mixing chamber
Pump type
366322, B01F 512
Patent
active
059612126
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention concerns a screw for apparatuses used for water purification installations, such as aerators or mixers, and more particularly for apparatuses of the type in which a source of power, which may or may not be mounted on a float, drives a shaft on which a screw (impeller device) is fitted. In aerators the water is sucked up, deflected and spread more or less horizontally over the surface of the water. In mixers the water is sucked in and impelled down under the surface of the liquid.
The state of the art impeller device (Belgian patent 884.216) consists of two parts, namely a lower part formed by a screw and an upper part formed by a paddle wheel.
This embodiment was improved by the Belgian patent 893.687 by converting the screw and the paddle wheel to a single body in which the screw is gradually curved in the form of a spiral and merges into the paddles of the paddle wheel. In this way, a screw pump is formed, consisting of one single body in the form of a centrifugal screw propeller.
This screw pump can serve either as an aerator or as a mixer, and can even be combined as a mixer/aerator as described in European patent 366.644.
Such a screw pump can be single-stage (with one helicoidal, spiral-shaped screw blade) but can also be multistage (with several helicoidal, spiral-shaped screw blades). It is clear that a multistage screw involves more frictional losses and causes more turbulence in the flow of water sucked up or sucked in. A multistage pump also demands a greater capacity on the part of the power source. If a single-stage pump is used, the frictional losses and turbulence are reduced, and a power source with lower capacity is sufficient, but the water flow rate is also reduced.
SUMMARY OF THE INVENTION
The aim of this invention is to offer a screw that combines the advantages of both the multistage and the single-stage pump, while avoiding the disadvantages of the multistage and single-stage pump.
According to the invention, the screw has a helicoidal, spiral shaped form and consists of at least one continuous screw blade and at least one extra, discontinuous screw blade located near the upper and/or lower end part of the screw.
In the description and claims hereunder, one should understand by continuous screw blade, a screw blade starting at the upper part of the screw and continuing until the lower part of the screw; by discontinuous screw blade, a screw blade fitted exclusively round an end part of the screw (upper and/or lower end part).
According to an advantageous embodiment, the screw has two blades at the bottom, with one blade continuing through to the upper end part.
According to another embodiment, the screw has two blades below, with one blade continuing to near the top end part, which in turn has two blades.
It is clear that a screw pump with for example two continuous blades and with four blades in the lower and/or upper end part can also be used according to the invention.
In this way, the flow rate of the water stream can be increased by the presence of additional blades on the intake side of the pump, while on the other hand the frictional losses and turbulence can be kept low because the water only passes through one blade. Such a screw pump accordingly only requires a small capacity from the power source for a high flow rate.
In the case of aerators, by increasing the number of blades near the upper end part, the effect of the centrifugal force of the screw is increased, and the output speed and distribution of the water current are improved, thus increasing the area of contact with the air.
In the case where the apparatus is used as a mixer, better suction is improved by the extra screw blades above and/or the impeller force is increased by extra screw blades below.
According to an advantageous embodiment, the screw consists of a cylinder-shaped shaft driven by a motor, said shaft having on the motor side a more or less trumpet-shaped deflector body curving towards the outside. A screw with a helicoidal, spiral-shaped motion is mount
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Aquasystems International N.V.
Cooley Charles E.
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