Gas and liquid contact apparatus – Contact devices – Liquid tank
Patent
1993-04-26
1994-03-01
Miles, Tim
Gas and liquid contact apparatus
Contact devices
Liquid tank
2611222, 210236, B01F 304, C02F 320
Patent
active
052904873
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for aeration of a liquid vessel comprising at least one guide rail and a plurality of sliders arranged thereon and the sliders include holders carrying at least one hose of which at least a portion is perforated and the device further comprises pulling means for the hose.
DESCRIPTION OF THE PRIOR ART
Various aeration systems comprising a special aeration body have been disclosed in the prior art. Due to a rather complicated structure of the aeration body the costs for manufacture, installation and maintenance of such systems are relatively high.
Other known aeration systems comprise an aeration body formed of a hose or plurality of hoses. Each hose is provided by perforation enabling delivery of the air into the environment of a vessel. In one embodiment the hose is located in a guide of an U-section profile, in another embodiment the hose is provided by holders with sliders which are guided inside or upon a rail. The hose is fixed to the holders mostly by a glue. The application of hoses enables in principle to provide an unlimited aeration capacity. Nevertheless, it also involves certain problems arising specifically in connection with the application of hoses in the described manner.
The hoses located for example in a guide of an U-section profile are preloaded what results not only in reduction of the service life of a hose, but also adversely affects the dimension of the perforation holes and as the case may be causes plastic deformation of the hose. However, the preloading of the hose is necessary by the known arrangements for example in the situation when the passing section or the perforation holes of the hose are to be cleaned.
An undesired preloading of the hose along with all the adverse effects occur also with the other above described system comprising holders, firstly when the hose is being pulled into its working position. For certain time, the perforation holes are thus broadened what gives birth to the increased penetration of liquid into the hose when the air pressure in the hose drops and simultaneously to the expansion of air bubbles what results in reduction of the exploitation of oxygen and consequently impairs the aeration effect. From the long-term point of view the same consequences arise as by the previous described system and the common effect is the reduction of the service life of the hose.
Another disadvantage of the embodiment with the hose carried by holders is seizing or jamming of sliders on the guide rail what may cause breakage of the hose. The remaining part of the hose cannot not be removed from the vessel unless the operation of the relevant equipment is discontinued.
SUMMARY OF THE INVENTION
The foregoing drawbacks are to the considerable extent avoided by a device for aeration of liquid vessel according to the invention comprising a perforated hose supported by holders which hose is movable along its axis with respect to said holders whereby the holders have a closed circular shape and their sliders are connected to pulling means.
Accordingly, the important object of the invention is to avoid any preloading of the hose even in the process of installation when the hose is pulled into its working position. The pulling means, for example a steel strand wire, connect the sliders of holders while the hose surrounded by holders is axially movable with respect to the holders and it is therefore impossible to initiate any stress in the hose.
Furthermore, when the pulling means consist of a strand wire, each slider is provided with a passage and a fastening bolt for fixing the wire to the slider. An advantage of such an arrangement is that a jamming or seizure of the slider in the rail is eliminated since its correct position with respect to the rail is secured by the fixed attachment to the strand wire. Alternatively the slider may be supported on the rail by means of a rolling element especially when all parts of the mechanism are heavy and massive.
Likely, in the embodiment where both ends of the hose ar
REFERENCES:
patent: 3880965 (1975-04-01), Dudis et al.
patent: 3977606 (1976-08-01), Wyss
patent: 4960546 (1990-10-01), Tharp
patent: 5059358 (1991-10-01), Tharp
patent: 5160460 (1992-11-01), Goetz et al.
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