Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1997-01-06
1999-03-23
Moore, Chris K.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15409, B65G 5310
Patent
active
058843604
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a nozzle arrangement for the positive intake and removal of solid particles and/or flow media, with separately disposed nozzle components being connected by pressure or suction lines.
It further relates to preferred uses of this nozzle arrangement.
Known nozzles for the intake and removal of particles such as sand, dust, packing and insulating materials or of flow media (flowable media) such as gases, real liquids or pulverulent substances are as a rule connected to compressors which accelerate a transport medium. Suitable suction processes demand high suction power in order to produce the required dragging forces, mostly produce a large amount of noise and, in addition, move the transported matter to its destination with a considerable excess of energy.
As a result, dust particles for instance, are passed through filters, so that in practice the cleaning process often results in a physical separation of larger and smaller particles only; the dust, penetrating the filter, is merely relocated.
It is thus an object of the invention to provide a device which is free of the disadvantages of the state of the art.
The compressor power required should be lower as compared to the known suction arrangements, while still being used optimally. The transport flow media should be easily adaptable, during use, to the task at hand, i.e, to the particles to be transported and/or to similar or different flow media, also under changing conditions of operation.
According to the invention, there is provided a positive guiding of the transport medium, while utilizing the Coanda effect known from fluid mechanics.
A substantial advantage of this solution resides in the fact that the shearing forces created by the guided pressure flow detaches from their substrate the particles to be taken in and/or the additional flow media and sets them in motion, so that they can then be more easily transported, with less energy and at lower speeds.
Advantageously, the suction flow used for the above is quantitatively larger than the pressure flow.
Separating means are used to segregate the particles from the flow media, and may include fillers, separators and catalysts. They can be complemented or replaced by other, per se known process-engineering means and chemical/physical methods such as ion exchanges, cold traps, etc.
A nose-like body may form a disruption element for positive vortex formation and jet guidance, and is advantageously provided in addition to a disruption edge. An elastically or hingedly arranged pulsator may be mounted in the region of the nozzle mouth. This pulsator produces the impulse-like turbulences serving for the detachment of the Coanda flow in the working region. This positively produces non-stationary processes which replace a corresponding costly control of the pressure flow.
Both pressure and suction flow may be controlled by width-adjusting means to facilitate the adaptation of the flows to working conditions and to the media to be transported. Also, using suitable control members, flow conditions can be adjusted during operation.
Bores or slots may be provided in association with a nozzle arrangement to boost the flow in the working region. A powered or self-rotating brush may be provided which either directly touches the surface being worked, or is positioned above this surface and merely acts on the flows in the transverse direction, thereby assisting in the drawing-in of the media to be transported.
Differing flow velocities can be developed in one and the same pressure-nozzle component which has a particularly positive effect on the delivery performance of the arrangement with light particles.
The connection of the pressure and suction lines to a common drive unit is particularly energy-saving and, apart from the economic aspect, also positively affects noise emission.
The inclusion of lateral openings in the suction nozzle part generate a helical flow enhancing the removal of flow media and of possible particles.
A preferred use of the object according to the invention is
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Festo KG
Moore Chris K.
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