Agitating – Stirrer within stationary mixing chamber – Pump type
Patent
1998-02-26
1999-11-09
Soohoo, Tony G.
Agitating
Stirrer within stationary mixing chamber
Pump type
261 91, 261120, B01F 512, C10J 108
Patent
active
059801000
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for treating liquids and more specifically for mixing and/or aerating liquids, such as for example waste water.
Apparatuses of this type mainly comprise a power source such as a motor--which is mounted on a float and in which the power source drives an impeller device--such as a screw-shaped body--which is located at least partly beneath the surface of the liquid.
Floating mixers or aerators are generally known for treating waste water. Apparatuses of this kind are described in Belgian patents BE 884.216 and BE 893.687 in the Applicant's name.
One embodiment in which a single apparatus can be used as aerator and as mixer is described in Belgian patent 1.002.575. Mixing or aeration is carried out with this apparatus depending on the direction of rotation of the motor and thus of the screw. Thus, with one direction of rotation, the screw is made to axially pump the water upwards from below, after which the water is dispersed over the water surface at great speed. If the direction of rotation of the motor is reversed, the effect is obtained that the screw radially draws in the water from near the surface of the water and then pushes it axially downwards. In order to change over from aeration mode to mixing mode, the float is fitted with means for adjusting the immersion level of the apparatus.
During use of such apparatuses in liquids and also in contaminated water, it has been found that foam formation may take place at the surface of the liquid. This foam formation may lead to the motor or power source becoming defective if the foam builds up around it.
SUMMARY OF THE INVENTION
The object of the invention is to propose an apparatus for the mixing and/or aeration of liquids (waste water or other liquids) in which the power source (for example a motor, a motor reducer, etc.) is protected in an efficient manner against adverse external influences.
According to the invention, the power source is to this end mounted in a closed chamber, with said chamber also acting as a float, and said chamber contributes substantially to the buoyancy of the apparatus. In this way, foam formation and any atmospheric conditions are prevented from adversely affecting the power source and a more stable unit is at the same time obtained in which the centre of gravity of the apparatus is appreciably lowered. The construction of the apparatus also becomes more compact and simpler.
According to an embodiment of an apparatus according to the invention, the power source is centrally built into the float according to an axis perpendicular to the surface of the water.
According to another embodiment, the power source may be arranged with the impeller device at an angle with the surface of the water.
If the apparatus is to be used as an aerator, an air chamber may be fitted at the bottom of the float and around the top of the impeller device; said air chamber is connected to the atmosphere via a conduit provided for this purpose. The air can be drawn in via said conduit by the suction effect of the impeller device and further mixed with the liquid and pushed down. Other points for introducing air are also possible, such as for example addition of air at the underside of the impeller device. The air can be introduced by natural aspiration but can also be added in a forced manner (for example under pressure).
According to yet another embodiment of the invention, the power source may be arranged vertically and drive an impeller device which pumps the liquid upwards and hurls it over the surface in order to aerate it in this way.
An embodiment is also possible in which the power source drives an impeller device which also acts as a float.
The apparatus is normally manufactured from steel and preferably from stainless steel, although it is also possible to use other materials such as for example reinforced plastics and the like.
BRIEF DESCRIPTION OF THE DRAWINGS
Further details and characteristics will be apparent from the following description of a few non-limitative embo
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Aquasystems International N.V.
Soohoo Tony G.
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