# US 7,608,124 B2 · Particulate filtration system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,608,124 B2 - Document ID: US7608124B2 - Status: Granted - Kind: B2 - Application number: 11/426,989 - Filed: 2006-06-28 - Published: 2006-12-28 - Granted: 2009-10-27 - Earliest claimed: 2005-06-28 - Inventors: Robert E. Geyer, III - Web page: https://patentgrep.com/patent/US7608124B2 ## CPC - B01D 46/521: {using folded, pleated material} - B01D 46/0039: {with flow guiding by feed or discharge devices} - B01D 46/2403: {characterised by the physical shape or structure of the filtering element} - B01D 46/4281: {Venturi's or systems showing a venturi effect} - B01D 2275/201: Conical shape - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) ## Abstract A particulate filtration system including a frustoconical-shaped filtration element, a housing enclosing the filtration element and coaxial therewith, an inlet, and an outlet. The filtration element has a closed first end and a larger oppositely-disposed open second end. The housing has a first closed end, a larger oppositely-disposed open second end, and a frustoconical-shaped wall therebetween and surrounding the filtration element. An annular-shaped passage is defined by and between the filtration element and the housing. The inlet is located at the second end of the housing and is fluidically connected to the annular-shaped passage. The outlet is located at the second end of the filtration element and coaxial with the inlet. The outlet defines an outlet passage with a frustoconical or arcuate shape and a cross-sectional area that decreases along the flow path in a direction away from the filtration element. ## Claims ### Claim 1 A particulate filtration system for filtering particulate matter from a gas, the particulate filtration system comprising a filtration unit having a flow path therethrough, the filtration unit comprising: a frustoconical-shaped filtration element comprising a first end, an oppositely-disposed second end larger than the first end, an opening in the second end so as to define a filtration element outlet, means for sealing the first end, a frustoconical-shaped exterior surface, a frustoconical-shaped interior surface radially inward from the exterior surface, and a frustoconical-shaped interior cavity between the first and second ends and surrounded by the interior surface; a housing enclosing the filtration element and coaxial therewith, the housing comprising a first end, an oppositely-disposed second end larger than the first end, a frustoconical-shaped wall between the first and second ends of the housing, surrounding the filtration element, and having a frustoconical-shaped interior surface radially outward from the frustoconical-shaped exterior surface of the filtration element, an opening in the second end of the housing, and means for sealing the first end of the housing; an annular-shaped passage defined by and between the exterior surface of the filtration element and the interior surface of the housing; a filtration unit inlet defined by the opening at the second end of the housing and fluidically connected to the annular-shaped passage; and an outlet member at the second end of the filtration element and fluidically connected to the interior cavity of the filtration element, the outlet member defining an outlet passage that is coaxial with the filtration unit inlet and with a shape chosen from the group consisting of frustoconical and arcuate, the outlet passage having a cross-sectional area that decreases along the flow path in a direction away from the filtration element and defining a filtration unit outlet; wherein the filtration unit inlet, the annular-shaped passage, the filtration element, the interior cavity of the filtration element, and the outlet passage define the flow path through the filtration unit and are sized and shaped relative to each other to contour flow through the filtration system by decreasing flow velocity through the filtration element so as to reduce face velocity and reduce differential pressure across the filtration element, and by increasing flow velocity between the filtration unit inlet and the filtration element outlet and further increasing flow velocity between the filtration element outlet and the filtration unit outlet. ### Claim 2 (depends on 1) The particulate filtration system according to claim 1, wherein the annular-shaped passage has a cross-sectional area that decreases along the flow path in a direction away from the filtration unit inlet. ### Claim 3 (depends on 2) The particulate filtration system according to claim 2, wherein the annular-shaped passage has a width defined by and between the exterior surface of the filtration element and the interior surface of the housing, and the width is substantially constant throughout the extent of the annular-shaped passage. ### Claim 4 (depends on 2) The particulate filtration system according to claim 2, wherein the annular-shaped passage has a width defined by and between the exterior surface of the filtration element and the interior surface of the housing, and the width decreases along the flow path in a direction away from the filtration unit inlet. ### Claim 5 (depends on 1) The particulate filtration system according to claim 1, wherein the outlet passage has an arcuate shape. ### Claim 6 (depends on 1) The particulate filtration system according to claim 1, wherein the outlet passage has a frustoconical shape. ### Claim 7 (depends on 1) The particulate filtration system according to claim 1, wherein the first end of the housing is adjacent the first end of the filtration element, and the second end of the housing is adjacent the second end of the filtration element. ### Claim 8 (depends on 7) The particulate filtration system according to claim 7, wherein the outlet member is surrounded by the opening in the second end of the housing such that the filtration unit inlet is annular shaped and defined between the second end of the housing and the outlet member. ### Claim 9 (depends on 8) The particulate filtration system according to claim 8, wherein the flow path has a first flow direction through the filtration unit inlet and an opposite flow direction through the filtration unit outlet. ### Claim 10 (depends on 1) The particulate filtration system according to claim 1, wherein the first end of the housing is adjacent the second end of the filtration element, and the second end of the housing is adjacent the first end of the filtration element. ### Claim 11 (depends on 10) The particulate filtration system according to claim 10, wherein the filtration unit outlet and the filtration unit inlet are oppositely disposed. ### Claim 12 (depends on 11) The particulate filtration system according to claim 11, wherein the flow path through the filtration unit inlet and the filtration unit outlet are in the same direction, and the flow path has a radially inward flow direction through the filtration element. ### Claim 13 (depends on 1) The particulate filtration system according to claim 1, wherein the housing further comprises a first arcuate transition region between the second end of the housing and the wall, and a second arcuate transition region between the wall and the first end of the housing. ### Claim 14 (depends on 1) The particulate filtration system according to claim 1, wherein the opening of the housing has a circular cross-sectional area. ### Claim 15 (depends on 1) The particulate filtration system according to claim 1, further comprising a silencing chamber between the interior cavity of the filtration element and the outlet member. ### Claim 16 A particulate filtration system for filtering particulate matter from a gas, the particulate filtration system comprising a filtration unit having a flow path therethrough, the filtration unit comprising: a frustoconical-shaped filtration element comprising a first end, an oppositely-disposed second end larger than the first end, an opening in the second end and so as to define a filtration element outlet having a circular cross-sectional area, means for sealing the first end, a frustoconical-shaped exterior surface, a frustoconical-shaped interior surface radially inward from the exterior surface, and a frustoconical-shaped interior cavity between the first and second ends and surrounded by the interior surface; a housing enclosing the filtration element and coaxial therewith, the housing comprising a first end, an oppositely-disposed second end larger than the first end, a frustoconical-shaped wall between the first and second ends of the housing, surrounding the filtration element, and having a frustoconical-shaped interior surface radially outward from the frustoconical-shaped exterior surface of the filtration element, an opening in the second end of the housing defining a filtration unit inlet and having a circular cross-sectional area, and means for sealing the first end of the housing; an annular-shaped passage defined by and between the exterior surface of the filtration element and the interior surface of the housing and fluidically connected to the filtration unit inlet, the annular-shaped passage having a cross-sectional area that decreases along the flow path in a direction away from the filtration unit inlet; and an outlet member at the second end of the filtration element coaxial and fluidically connected to the interior cavity of the filtration element, the outlet member defining an outlet passage that is coaxial with the filtration unit inlet and with a shape chosen from the group consisting of frustoconical and arcuate, the outlet passage defining a filtration unit outlet and having a circular cross-sectional area that decreases along the flow path in a direction away from the filtration element and toward the filtration unit outlet; wherein the filtration unit inlet, the annular-shaped passage, the filtration element, and the outlet passage define the flow path through the filtration unit and are sized and shaped relative to each other to contour flow through the filtration system by decreasing flow velocity through the filtration element so as to reduce face velocity and reduce differential pressure across the filtration element, and by increasing flow velocity between the filtration unit inlet and the filtration element outlet and further increasing flow velocity between the filtration element outlet and the filtration unit outlet. ### Claim 17 (depends on 16) The particulate filtration system according to claim 16, wherein: the first end of the housing is adjacent the first end of the filtration element; the second end of the housing is adjacent the second end of the filtration element; the outlet member is surrounded by the filtration unit inlet; the annular-shaped passage has a width defined by and between the exterior surface of the filtration element and the interior surface of the housing, and the width is substantially constant throughout the extent of the annular-shaped passage; and the flow path has a first flow direction through the filtration unit inlet and, an opposite flow direction through the filtration unit outlet. ### Claim 18 (depends on 16) The particulate filtration system according to claim 16, wherein: the first end of the housing is adjacent the second end of the filtration element; the second end of the housing is adjacent the first end of the filtration element; the filtration unit outlet and the filtration unit inlet are oppositely disposed; the annular-shaped passage has a width defined by and between the exterior surface of the filtration element and the interior surface of the housing, and the width decreases along the flow path in a direction away from the filtration unit inlet; and the flow path through the filtration unit inlet and the filtration unit outlet are in the same direction, and the flow path has a radially inward flow direction through the filtration element. ### Claim 19 (depends on 16) The particulate filtration system according to claim 16, wherein the housing further comprises a first arcuate transition region between the second end of the housing and the wall, and a second arcuate transition region between the wall and the first end of the housing. ### Claim 20 (depends on 16) The particulate filtration system according to claim 16, further comprising a silencing chamber between the interior cavity of the filtration element and the outlet member.