# US 10,767,536 B2 · Efficient mixing of gases in an exhaust aftertreatment system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,767,536 B2 - Document ID: US10767536B2 - Status: Granted - Kind: B2 - Application number: 15/937,066 - Filed: 2018-03-27 - Published: 2019-10-03 - Granted: 2020-09-08 - Earliest claimed: 2018-03-27 - Assignees: CNH Industrial America LLC - Applicants: CNH Industrial America LLC - Inventors: Daniel A. Morey; Nikolay B. Popov - Web page: https://patentgrep.com/patent/US10767536B2 ## CPC - F01N 3/2892: {Exhaust flow directors or the like, e.g. upstream of catalytic device} - B01F 23/213: by spraying or atomising of the liquids - B01F 25/103: {with additional mixing means other than vortex mixers, e.g. the vortex chamber being positioned in another mixing chamber} - B01F 25/3141: {with additional mixing means other than injector mixers} - B01F 25/4312: {having different kinds of baffles, e.g. plates alternating with screens} - B01F 25/45211: {the elements being cylinders or cones which obstruct the whole diameter of the tube, the flow changing from axial in radial and again in axial} - F01N 3/2066: {Selective catalytic reduction [SCR]} - F01N 13/0097: {the purifying devices are arranged in a single housing} - F01N 13/017: {the purifying devices are arranged in a single housing} - F01N 2240/20: a flow director or deflector - F01N 2470/02: Tubes being perforated - F01N 2470/18: the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus - F01N 2490/08: Two or more expansion chambers in series separated by apertured walls only - F01N 2610/02: the substance being ammonia or urea - Y02T 10/12: Improving ICE efficiencies - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An inlet for an SCR device including a tube having an upstream end for receiving exhaust gases and a downstream end terminating in a porous wall. A plurality of openings are spaced around the circumference of the tube adjacent the porous wall and a plurality of vanes are formed at a connection junction adjacent one edge of the opening to form vanes extending inward at an acute angle relative to a plane between the connecting junction and the longitudinal axis of the tube. Preferably, the vanes are concave on the surface extending inward to promote more effective mixing. ## Claims ### Claim 1 An inlet for exhaust gases to a selective catalytic reduction (SCR) device having a housing for flow through of exhaust gases, said inlet comprising: a tube having a longitudinal axis and an open upstream end receiving exhaust gases and a downstream end terminating in a porous wall; said tube having a plurality of openings spaced around the circumference of said tube adjacent to said porous wall; and, vanes, each vane extending from a respective connecting junction on said tube inwardly at an acute angle relative to a reference plane intersecting said respective connecting junction and the longitudinal axis of said tube, wherein a longitudinal axis of each connecting junction is substantially parallel to the longitudinal axis of said tube, and wherein said vanes have a concave surface facing radially inward. ### Claim 2 (depends on 1) The inlet as claimed in claim 1, wherein said vanes are integral with said tube. ### Claim 3 (depends on 1) The inlet as claimed in claim 1, wherein said porous wall is formed from a plurality of circular openings. ### Claim 4 (depends on 3) The inlet as claimed in claim 3, wherein said circular openings have an area of up to 50% of the surface area of said porous wall. ### Claim 5 (depends on 1) The inlet as claimed in claim 1, wherein said openings are equally spaced around the circumference of said tube. ### Claim 6 (depends on 1) The inlet as claimed in claim 1, wherein the acute angle said vanes make with respect to said reference plane is substantially 30°. ### Claim 7 An exhaust aftertreatment system comprising: a housing for a selective catalytic reduction (SCR) device, said housing having a generally cylindrical or oval cross section shape with a longitudinal axis; a plurality of catalyst housed therein over which the exhaust flows through said housing; an inlet comprising a tube having a longitudinal axis and an open upstream end for receiving exhaust gases and a downstream end extending into said housing and terminating in a porous wall, said tube having a plurality of openings spaced around the circumference of said tube adjacent to said porous wall and vanes, each vane extending from a respective connecting junction on said tube inwardly at an acute angle relative to a reference plane intersecting said connecting junction and the longitudinal axis of said tube, wherein a longitudinal axis of each connecting junction is substantially parallel to the longitudinal axis of said tube. ### Claim 8 (depends on 7) The exhaust aftertreatment system as claimed in claim 7, wherein said catalysts are in series flow relationship in said housing and the longitudinal axis of said tube is coaxial with the longitudinal axis of said housing. ### Claim 9 (depends on 7) The exhaust aftertreatment system as claimed in claim 7, wherein said catalysts are positioned offset from one another in said housing and in parallel flow relationship, the longitudinal axis of said tube is offset from the longitudinal axis of said housing. ### Claim 10 (depends on 7) The exhaust aftertreatment system as claimed in claim 7, wherein said vanes are integral with said tube. ### Claim 11 (depends on 7) The exhaust aftertreatment system as claimed in claim 7, wherein said vanes have a concave surface facing inward. ### Claim 12 (depends on 7) The exhaust aftertreatment system as claimed in claim 7, wherein said porous wall is formed from a plurality of circular openings. ### Claim 13 (depends on 12) The exhaust aftertreatment system as claimed in claim 12, wherein said circular openings have an area of up to 50% of the surface area of said porous wall. ### Claim 14 (depends on 7) The exhaust aftertreatment system as claimed in claim 7, wherein said openings are symmetrical around the circumference of said tube. ### Claim 15 (depends on 7) The exhaust aftertreatment system as claimed in claim 7, wherein said vanes each form an angle of substantially 30° with respect to said reference plane. ### Claim 16 An inlet for exhaust gases to a selective catalytic reduction (SCR) device having a housing for flow through of exhaust gases, said inlet comprising: a tube having a longitudinal axis and an open upstream end receiving exhaust gases and a downstream end terminating in a porous wall, wherein said porous wall is formed from a plurality of circular openings; said tube having a plurality of openings spaced around the circumference of said tube adjacent to said porous wall; and vanes, each vane extending from a respective connecting junction on said tube inwardly at an acute angle relative to a reference plane intersecting said respective connecting junction and the longitudinal axis of said tube wherein a longitudinal axis of each connecting junction is substantially parallel to the longitudinal axis of said tube. ### Claim 17 (depends on 16) The inlet as claimed in claim 16, wherein said circular openings have an area of up to 50% of the surface area of said porous wall.