Gas and liquid contact apparatus – Contact devices – Rotating
Reexamination Certificate
2000-01-14
2001-11-20
Bushey, C. Scott (Department: 1724)
Gas and liquid contact apparatus
Contact devices
Rotating
C261S093000, C261SDIG007, C210S628000
Reexamination Certificate
active
06318705
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to an aspirator. In particular, the present invention is directed toward an aspirator used for sewage and wastewater treatment that has reduced power requirements by using a plurality of debris-shedding, finned aspirator tubes to inject approximately 30% more air than conventional designs at 50% of the rotational speed.
BACKGROUND
Commonly assigned U.S. Pat. No. 5,599,452 to MacLaren et al. discloses a wastewater treatment method which uses a conventional aspirator design.
U.S. Pat. No. 3,776,531 to Ebner, et al. discloses an apparatus with separate propeller blades and aspirator tubes for dispersing and entraining a fluid, particularly a gas, in a liquid. The reference teaches that the aspirator tubes should be at an angle between 35 degrees and 75 degrees, when compared to the vertical axis of the shaft.
U.S. Pat. No. 5,318,360 to Langer, et al. discloses a gas dispersion stirrer comprising a rotatable shaft and at least one hollow, disk-shaped stirring/aspirating member. This reference teaches the inclusion of flow-inducing blades on both the top side and the bottom side of the disk-shaped member.
The Soviet Union patent SU 1,315,391 shows the utilization of swirlers 13 on the outer edges of the hollow vanes 5.
U.S. Pat. No. 3,779,531 to White shows some aeration tubes that are utilized at a downward angle compared to the vertical shaft.
The Japanese patent JP 63-028432 shows inclined aeration tubes in FIGS. 1 and 3.
U.S. Pat. No. 1,380,970 to Meridith-Jones shows the utilization of rods to break up liquid.
U.S. Pat. No. 1,124,855 to Callow, et al. shows angled aeration tubes 13 in FIG. 1.
SUMMARY OF THE INVENTION
The aspirator design includes a fin along the aspirator tube, which is formed at a 45 degree angle relative to the aspirator shaft. The aspirator is utilized to introduce air into a liquid. The advantages of the present design include the ability to inject approximately 30% more air than your conventional current design at 50% of the rotational speed. This reduces the power requirements. Additionally, the 45 degree angle of the aspirator tubes helps to shed debris that might otherwise collect on the aspirator. Superior mixing is provided by the larger profile of the aspirator. The fins along the bottom of the aspirator tubes help to create larger voids in the liquid. This increases the aspirator's capacity to inject air, while minimizing the material requirements of the part.
REFERENCES:
patent: 1380970 (1921-06-01), Meredith-Jones
patent: 3776531 (1973-12-01), Ebner et al.
patent: 3779531 (1973-12-01), White
patent: 4505813 (1985-03-01), Graves
patent: 4925598 (1990-05-01), Kivisto et al.
patent: 5318360 (1994-06-01), Langer et al.
patent: 5389310 (1995-02-01), Leiponen
patent: 5599452 (1997-02-01), MacLaren et al.
patent: 5660766 (1997-08-01), Van Dyk
patent: 5795504 (1998-08-01), Berchotteau
patent: 52-028058 (1977-03-01), None
patent: 63-028432 (1988-02-01), None
patent: 1315391 A1 (1987-07-01), None
Bushey C. Scott
Jet Inc.
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