Gas and liquid contact apparatus – Contact devices – Liquid tank
Patent
1990-07-31
1992-11-03
Silverman, Stanley S.
Gas and liquid contact apparatus
Contact devices
Liquid tank
261124, 210170, 2102211, 210236, 138106, C10J 108, C02F 320, A01K 6304
Patent
active
051604604
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a ventilation system for a liquid-filled basin.
2. Description of the Prior Art
Diverse ventilators are well-known for liquid-filled basins, which have a ventilation device rather complicated in design. The connection of the ventilation device of necessity includes intensive installation and a bulky guide arrangement. A further disadvantage is that maintenance, repair, and replacement of components of the ventilation system are very complicated and labor-intensive.
In the DE-OS 36 27 655.0-23 an improved ventilation system is disclosed, in which a ventilation hose is laid in a permanently installed upwardly open U-profile guide anchored below the liquid surface and held fast by straps which extend over the hose. The hose is pulled in the U-profile guide under prestress.
Prestressing of the ventilation hose has not proved in practice to be effective. The concept described in DE-OS 36 27 665.0-23 to effect a freeing of the perforation of the ventilation hose from deposits, blockages, etc. through variation of the prestress and the resulting extension in length is not effective, since problematic deposits cannot be removed in this fashion. The high prestress of the hose, which entails considerable mechanical apparatus, leads in the long run to a plastic deformation of the hose, which necessarily requires that it repeatedly be shortened, until finally the material is exhausted after a relatively short useful life. The perforation holes are expanded by the prestress which leads to an undesirable increased intrusion of water in the ventilation hose when the prevailing air pressure drops off. The air bubbles also become larger through the expansion of the holes so that the utilization of oxygen is less efficient; the effect of ventilation is reduced.
SUMMARY OF THE INVENTION
The task of the invention is to create a simply constructed, easily maintained ventilation system, in which a ventilation hose is laid without prestress and resulting consequently in a reduced material wear, a longer useful life, a better utilization of oxygen and a reduced intrusion of water.
This task is fulfilled with a ventilation system. for a liquid-filled basin, particularly a liquid purification plant or a fish fattening tank, which comprises at least one guide rail affixed to the basin, each guide rail having a descending intake section, a horizontal section adjacent the bottom of the basin and an arcuate section connecting the intake and horizontal sections of the guide rail, a hose associated with each guide rail, each hose having a circumferentially extending outer wall and an intake section associated with the descending intake section of the guide rail, a horizontal section associated with the horizontal guide rail section and a connecting section associated with the arcuate guide rail section. At least one of the hose sections is perforated for permitting air to escape from the hose into the liquid-filled basin. A plurality of hose holding devices are glidably guided along the guide rail and spaced therealong from each other for retaining the hose in position along the guide rail against buoyancy in an operating position of the hose in the liquid-filled basin, the holding devices being connected to a lower portion of the outer hose wall for guiding the hose along the guide rail, and a traction device is attached to the hose for pulling the hose into the basin as it is guided along the guide rail.
In a preferred embodiment, the horizontal guide rail section extends below the horizontal hose section. This provides a compact structure and also makes it possible to lay a plurality of ventilation hoses immediately adjacent each other at the same level.
If the available construction height is limited, it may be preferred to associate two guide rails with each hose, the guide rails being arranged at respective sides of a lower vertex of the outer wall of the associated hose.
Each guide rail may comprise a hollow profile with a slit extending in a longit
REFERENCES:
patent: 3318098 (1967-05-01), Hoddinott et al.
patent: 3880965 (1975-04-01), Dudis et al.
patent: 4051035 (1977-09-01), Boschen et al.
patent: 4923614 (1990-05-01), Engelbart
patent: 4960546 (1990-10-01), Tharp
Goetz Helmut
Scheibinger Ludwig
Steinbach Peter
Metz Mannheim GmbH
Popovics Robert James
Silverman Stanley S.
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