Liquid purification or separation – Structural installation – Flume stream type
Patent
1997-02-04
1998-05-26
Lithgow, Thomas M.
Liquid purification or separation
Structural installation
Flume stream type
210162, 210295, 210314, 210413, B01D 2962, B01D 2964, E02B 508
Patent
active
057559589
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a device for removing material screened or filtered out of a liquid flowing in a channel, especially in waste water treatment plants. Although the device is especially intended for water treatment plants, it can also be employed in a practical way in other fields of technology, in the textile and plastic industries, in slaughter-houses, in poultry farms, in tanneries, etc., for example, in order to remove material, i.e. sieve or raking material, out of the liquid.
BACKGROUND OF THE INVENTION
A device of the type mentioned above is known from DE 40 06 970 A1. The semicircular grating bars of the grating surface are fixed to each other, fixly mounted and form a grating surface with its inner concave surface. The grating bars extend only partly about the lower part of the circumference. The part of the cylinder which is not covered by the grating bars is closed by a covering in form of a semicylindrical wall or sheet steel. The front side of the cylinder id designed open to make the entry of the liquid including the material possible. The liquid flows through the grating surface from the inside to the outside of the cylinder so that the material is deposited on the inside, i.e. on the concave side of the grating bars. A removing beam having removing elements is rotatably driven around the axis of the cylinder. The removing elements of the removing beam extend in a comb-like fashion into the slots between the grating bars from the inside to the outside and gathers the material during revolution. A conveying device is arranged outside the cylinder of the grating surface, the conveying device comprising a tube-like housing, a shaft and a screw on the shaft. The conveying device has an opening for the material to enter. The tubelike housing is designed closed with the exception of the inlet and outlet. A space is provided between the coverings in sheet steel form and the beginning of the semicircular grating bars. The space serves for the transition of the material from the grating surface to the conveying device. In the region of transition of the material a comb-like stripper is arranged. Changing the direction of revolution of the removing beam a stripping effect occurs loosening the material from the removing elements of the removing beam so that the material falls into the opening of the conveying device. It is not evident where the liquid level of the oncoming liquid is positioned. Due to the fact that the entry of the liquid only is possible through the front surface of the cylinder and a part of the grating surface as large as possible should be used for depositing of the material on the grating surface the liquid level should be arranged in an adapted height. However, in this case, at least a large part of the opening of the conveying device is positioned below the liquid level so that the material loosened can fall only from the comb-like stripper into the liquid. Since the housing of the conveying device is designed in closed manner the flow of the liquid can only happen in the region of the grating surface so that the danger results that the material loosened from the comb-like stripper falls down into the liquid again and again without being removed out of the channel. Thus, a concentration of material results on the grating surface. If, however, the liquid level is chosen much lower the opening of the conveying device is prepared to take over material, but in this case the effective area of the grating surface is substantially reduced and the effectivity is decreased. The disadvantages described depend on the height of the liquid level. It is a further disadvantage that the removing beam and the removing elements cooperate with the inner circumference of the semicircular grating bars. The removing beam is positioned facing the concave side of the grating surface, i.e. in a place in the liquid, in which the liquid contains the material. From this the danger results that the material will deposit on the removing beam generating stricks of the materia
REFERENCES:
patent: 2910181 (1959-10-01), Schade
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