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An assembly for removing grit particles from a fluid having a flow. The assembly includes a tank having walls for holding fluid for separation of grit particles from the fluid, a fluid inlet for flow of fluid into the tank, a fluid outlet for flow of fluid from the tank, an inlet diffusion baffle assembly including a baffle positioned to direct fluid flow toward the tank walls and a lower chamber of the tank, and an outlet baffle assembly including a baffle positioned in a rear of the tank at an upward slope from the center of the tank toward the fluid outlet configured to direct fluid flow toward the center of the tank.

Titel:	High efficiency grit removal system
Autor/in / Beteiligte Person:	Wilcher, Stephen B. ; Slaby, Robert ; Quimby, Thomas W.
Link:	View record in USPTO Patent Grants (Volltext)
Veröffentlichung:	2010
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Grants Sprachen: English Patent Number: 7,824,549 Publication Date: November 02, 2010 Appl. No: 12/248979 Application Filed: October 10, 2008 Assignees: WSG & Solutions, Inc. (Montgomeryville, PA, US) Claim: 1. An assembly for removing grit particles from a fluid having a flow, the assembly comprising: a tank having walls for holding fluid for separation of grit particles from the fluid, the walls including a front wall, a rear wall, and two side walls extending between the front wall and the rear wall, the tank including a center between the front wall and the rear wall; a fluid inlet for flow of fluid into the tank, the inlet positioned adjacent the front wall; a fluid outlet for flow of fluid from the tank, the outlet positioned adjacent the rear wall; an inlet diffusion baffle assembly including a baffle positioned immediately adjacent the fluid inlet to direct fluid flow toward the two side walls and a lower chamber of the tank; and an outlet baffle assembly including a baffle positioned in a rear of the tank at an upward slope from the center of the tank toward the fluid outlet configured to direct fluid flow toward the center of the tank. Claim: 2. The assembly of claim 1 wherein the inlet diffusion baffle assembly includes a plurality of baffles. Claim: 3. The assembly of claim 1 wherein the inlet diffusion baffle assembly includes a plurality of perforations. Claim: 4. The assembly of claim 1 wherein the front wall is positioned at a downward slope toward the center of the tank. Claim: 5. The assembly of claim 4 wherein the inlet baffle assembly is positioned substantially parallel to the front wall. Claim: 6. The assembly of claim 4 wherein the inlet baffle assembly is positioned substantially perpendicular to the front wall. Claim: 7. The assembly of claim 1 wherein the outlet baffle assembly includes a plurality of baffles. Claim: 8. The assembly of claim 1 wherein the rear wall is positioned at a downward slope from the outlet toward the center of the tank. Claim: 9. The assembly of claim 8 wherein at least a portion of the outlet baffle assembly is positioned substantially parallel to the rear wall. Claim: 10. The assembly of claim 1 , further comprising an aeration header located substantially below the inlet diffusion baffle assembly configured to promote a rolling motion of the fluid near the center of the tank. Claim: 11. The assembly of claim 10 wherein the aeration header includes a diffuser. Claim: 12. The assembly of claim 1 , further comprising a grit removal device positioned in the lower chamber of the tank configured to remove grit particles from the tank. Claim: 13. The assembly of claim 12 wherein the grit removal device delivers the grit to an upper tank for removal. Claim: 14. The assembly of claim 13 wherein the upper tank includes a conveyor configured to remove and transport grit particles to a receiving container for disposal. Claim: 15. The assembly of claim 1 , further comprising a surface skimmer configured to collect and deliver grit particles from a surface of the tank to the fluid outlet. Claim: 16. The assembly of claim 1 , further comprising an adjustable outlet weir assembly positioned adjacent the fluid outlet configured to control fluid discharge from the assembly. Claim: 17. An assembly for removing grit particles from a fluid having a flow, the assembly comprising: a tank having walls for holding fluid for separation of grit particles from the fluid; a fluid inlet for flow of fluid into the tank; a fluid outlet for flow of fluid from the tank; an inlet diffusion baffle assembly including a baffle positioned to direct fluid flow toward the tank walls and a lower chamber of the tank; and an outlet baffle assembly including a baffle positioned in a rear of the tank at an upward slope from the center of the tank toward the fluid outlet configured to direct fluid flow toward the center of the tank, wherein the outlet baffle assembly includes a plurality of perforations. Current U.S. Class: 210/220 Patent References Cited: 2118157 May 1938 Camp ; 3161590 December 1964 Weis et al. ; 3221889 December 1965 Hirsch ; 3710941 January 1973 Brociner ; 4064054 December 1977 Anderson et al. ; 4886605 December 1989 Herve ; 4985148 January 1991 Monteith ; 5605636 February 1997 Wyness ; 6997328 February 2006 Wilcher et al. Primary Examiner: Upton, Christopher Attorney, Agent or Firm: Michael Best & Friedrich LLP

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High efficiency grit removal system