Liquid purification or separation – Structural installation – Geographic
Reexamination Certificate
1999-03-18
2001-06-26
Simmons, David A. (Department: 1724)
Liquid purification or separation
Structural installation
Geographic
C210S284000, C210S316000, C210S320000, C210S456000, C405S052000
Reexamination Certificate
active
06251269
ABSTRACT:
TECHNICAL FIELD
The present invention relates generally to filters for removing impurities from a fluid flow. In particular, the invention is a modular filter system having a replaceable filter element for removing impurities from a generally horizontal fluid flow.
BACKGROUND OF THE INVENTION
Filters for removing impurities from a fluid flow are well known and are used in many applications. For example, filters are used to remove particles and bacteria from water to purify the water, thus making it suitable for drinking. Filters are also used to strain particulate from flows of other fluids, such as motor oil and milk. One example of a filter used to purify drinking water is shown in the Higashijima et al. patent, U.S. Pat. No. 5,397,462. The Higashijima et al. patent discloses a vertical water filter having a replaceable cartridge that removes impurities from a water supply. The filter is attached to a flow of water, which is forced vertically up into the cartridge and through a filter member. The water exits the filter at its top portion as a purified water supply suitable for drinking.
Another example of a water filter is shown in the Winans patent, U.S. Pat. No. 1,532,013. The Winans patent discloses a device for filtering rain water. The device has a wire screen positioned over a basket that contains a filtering material, such as charcoal. Rain water flows into the screen and the charcoal under normal gravitational forces. The screen removes large particles from the water flow, and the charcoal removes additional, smaller impurities from the rain water. The water then exits the bottom of the basket as a filtered water source.
Chemicals, such as fertilizers and weed killers, are in widespread use to promote the growth of crops and grass. Through normal ground water run off, these chemicals can seep into the subterranean water table. This problem is particularly evident in situations where a wide variety of chemicals are used to maintain a tract of land, such as at a golf course. Golf course groundskeepers typically use different types of fertilizers and weed killers to promote and maintain the health of fairways and greens. Because proper drainage is required to keep the course in shape for golfers, a tile system is often used to drain ground water from fairways and greens. The chemicals applied to the course, however, are also carried away by the ground water.
To prevent these chemicals from seeping into the subterranean water table, a filter can be used to remove the chemicals prior to discharging the excess ground water from the tile drain. These filters can be horizontal in nature, with fluid draining into and collecting at the filter under normal gravitational forces. Pressure from the water that collects at the filter forces the water through the filter. One shortcoming of filters of this type is that they typically only use a single filter element, which is thus capable of removing only a predetermined number and type of chemicals or impurities from the water supply. In addition, conventional horizontal filters make inefficient use of the filter element since the water flows primarily through the bottom half of the filter. As such, the bottom half of the filter element becomes clogged with impurities, thus necessitating replacement of the filter element, while the top half is still useable.
There is therefore a continuing need for an improved filter system. In particular, a filter system that creates and promotes a uniform horizontal fluid flow through a filter element is desirable to make more efficient use of the filter element. In addition, a filter system that permits more than one filter element to be used to remove a greater number of chemicals and impurities from a water supply is desirable. A filter system having removable filter elements is also highly desirable to permit the easy replacement of the filter elements after they become clogged with impurities.
SUMMARY OF THE INVENTION
The present invention is a filtration system for receiving a fluid flow to remove impurities from the fluid flow. The filtration system includes a first filter having an upstream end and a downstream end. The first filter comprises an inlet region at the upstream end of the filter, a mixing chamber for creating a generally horizontal fluid flow through the inlet region, a filter coupled to the inlet region for receiving the uniform horizontal fluid flow, and an outlet region at the downstream end of the filter. The inlet region of the filter is coupled to the fluid flow, and the mixing chamber receives the fluid flow at the inlet region of the filter. The filter housing is fluidly coupled to the inlet region for receiving the uniform horizontal fluid flow, and a filter element is positioned in the filter housing. The outlet region of the filter is coupled to the filter housing downstream of the filter housing, and receives the uniform horizontal fluid flow after it has passed through the filter element. The outlet region of the filter discharges the horizontal fluid flow from the filter.
In one embodiment, an input pipe extends into the mixing chamber to deliver the fluid flow source into the filter, and the mixing chamber at the upstream end of the filter is sized and shaped to create a substantially uniform horizontal flow. The input pipe has an inlet end that is coupled to the fluid flow and a planar discharge end through which the fluid flow exits into the mixing chamber. The planar discharge end of the input pipe is angled with respect to a horizontal axis of the filter.
In a second embodiment, the filtration system further includes a second filter having an upstream end and a downstream end. The second filter comprises an inlet region that is coupled to the outlet region of the first filter to receive the uniform horizontal fluid flow from the first filter, a filter housing fluidly coupled to the inlet region of the second filter, and an outlet region fluidly coupled to the filter housing of the second filter. The second filter receives the uniform horizontal flow from the first filter, and a filter element positioned in the filter housing of the second filter removes additional impurities from the horizontal fluid flow.
REFERENCES:
patent: 261014 (1882-07-01), McLachlan
patent: 1532013 (1925-03-01), Winans
patent: 3642138 (1972-02-01), Sheda
patent: 3788484 (1974-01-01), Godin
patent: 3834539 (1974-09-01), Thompson
patent: 4124511 (1978-11-01), Lay
patent: 4376053 (1983-03-01), Bullock et al.
patent: 4495072 (1985-01-01), Fields
patent: 4507072 (1985-03-01), Gaul, Jr.
patent: 4539718 (1985-09-01), Haer
patent: 4582605 (1986-04-01), Rea et al.
patent: 4609459 (1986-09-01), Hendrix
patent: 4678589 (1987-07-01), Ayres, Jr.
patent: 4689145 (1987-08-01), Mathews et al.
patent: 4949406 (1990-08-01), Canelli
patent: 4992181 (1991-02-01), Siebert
patent: 4996725 (1991-03-01), Pino
patent: 5027447 (1991-07-01), Pino
patent: 5174897 (1992-12-01), Wengrzynek
patent: 5242584 (1993-09-01), Hoarau
patent: 5397462 (1995-03-01), Higashijima et al.
patent: 5498334 (1996-03-01), Gneuss
patent: 5788409 (1998-07-01), Johnson
patent: 5823711 (1998-10-01), Herd et al.
Bloom Ronald P.
Johnson Dennis J.
Faegre & Benson
Lawrence Frank M.
Simmons David A.
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