# US 2017/0282135 A1 · Dosing and mixing arrangement for use in exhaust aftertreatment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0282135 A1 - Document ID: US20170282135A1 - Status: Published application - Kind: A1 - Application number: 15/021,567 - Filed: 2014-09-12 - Published: 2017-10-05 - Earliest claimed: 2013-09-13 - Assignees: Donaldson Company, Inc. - Applicants: Donaldson Company, Inc. - Inventors: Matthew S. WHITTEN; Bruce Bernard HOPPENSTEDT - Web page: https://patentgrep.com/patent/US20170282135A1 ## CPC - B01F 25/30: Injector mixers (mixing by creating vortex flow B01F25/10) - B01F 23/20: Mixing gases with liquids - B01F 23/2132: {using nozzles} - B01F 25/00: Flow mixers; Mixers for falling materials, e.g. solid particles (centrifugal mixers B04) - B01F 25/10: Mixing by creating a vortex flow, e.g. by tangential introduction of flow components - B01F 25/3131: {with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements} - F01N 3/20: specially adapted for catalytic conversion (F01N3/22 takes precedence) - B01F 2025/9121: {from the center to the circumference, i.e. centrifugal flow} - B01F 2025/931: {Flow guiding elements surrounding feed openings, e.g. jet nozzles} - F01N 1/088: {using vanes arranged on the flow path or flow tubes with tangentially directed apertures} - F01N 3/035: with catalytic reactors - F01N 3/106: {Auxiliary oxidation catalysts} - F01N 3/2066: {Selective catalytic reduction [SCR]} - F01N 3/2892: {Exhaust flow directors or the like, e.g. upstream of catalytic device} - F01N 13/009: {having two or more separate purifying devices arranged in series} - F01N 2240/20: a flow director or deflector - F01N 2470/18: the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus - F01N 2610/02: the substance being ammonia or urea - B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06) - 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) ## Abstract Dosing and mixing exhaust gas includes directing exhaust gas towards a periphery of a mixing tube that is configured to direct the exhaust gas to flow around and through the mixing tube to effectively mix and dose exhaust gas within a relatively small area. Some mixing tubes include a slotted region and a non-slotted region. Some mixing tubes include a louvered region and a non-louvered region. Some mixing tubes are offset within a mixing region of a housing. ## Claims ### Claim 1 A mixing tube arrangement for swirling exhaust gases, the mixing tube arrangement comprising: a tube body having a longitudinal axis extending along an interior passage from a first end of the tube body to a second end of the tube body, the tube body defining a slotted region and a non-slotted region, the slotted region defining a plurality of slots, the slotted region extending over a first circumferential distance of the tube body and the non-slotted region extending over a second circumferential distance of the tube body, the second circumferential distance being less than the first circumferential distance; and a plurality of louvers disposed at the slots. ### Claim 2 (depends on 1) The mixing tube arrangement of claim 1, further comprising a doser disposed at a first end of the tube body, the doser being configured to dispense a reactant into exhaust flowing through the interior passage of the tube body. ### Claim 3 (depends on 1) The mixing tube arrangement of claim 1, wherein the slotted region extends along less than a full length of the tube body. ### Claim 4 (depends on 1) The mixing tube arrangement of claim 1, wherein a ratio of an axial length of each slot to a diameter of the tube body is about 1.5 to about 2. ### Claim 5 (depends on 4) The mixing tube arrangement of claim 4, wherein the ratio of the axial length of each slot to the diameter of the tube body is about 1.75. ### Claim 6 (depends on 1) The mixing tube arrangement of claim 1, wherein the louvers extend away from the tube body at an angle of about 45°. ### Claim 7 (depends on 1) The mixing tube arrangement of claim 1, wherein the slotted region extends along about 210° to about 330° of a circumference of the tube body. ### Claim 8 (depends on 7) The mixing tube arrangement of claim 7, wherein the slotted region extends along about 270° of the circumference of the tube body. ### Claim 9 (depends on 1) The mixing tube arrangement of claim 1, wherein a ratio of a circumferential width of each slot to a diameter of the tube body is about 0.05 to about 0.15. ### Claim 10 (depends on 9) The mixing tube arrangement of claim 9, wherein a ratio of a circumferential width of each slot to a diameter of the tube body is about 0.1. ### Claim 11 (depends on 1) The mixing tube arrangement of claim 1, wherein a diameter of the tube body is about 5 inches, a circumferential width of each slot is about 0.45 inches and a length of each slot is about 8 inches. ### Claim 12 (depends on 11) The mixing tube arrangement of claim 11, wherein the slots define about 45% of an area of the slotted region. ### Claim 13 A dosing and mixing arrangement comprising: a housing defining an inlet having an inlet axis, a mixing region, and an outlet having an outlet axis, the outlet axis being generally orthogonal to the inlet axis; a mixing tube arrangement disposed within the mixing region of the housing, the mixing tube arrangement including a tube body defining an interior passage that extends along the outlet axis, the tube body having a circumferential surface extending across the inlet axis, the circumferential surface having a louvered region and a non-louvered region, the louvered region defining a plurality of louvers extending outwardly from a circumferential surface of the tube body, the non-louvered region being free of louvers, the tube body also defining a plurality of slots that extend through the circumferential surface of the tube body, each louver being associated with at least one slot. ### Claim 14 (depends on 13) The dosing and mixing arrangement of claim 13, wherein the mixing tube arrangement touches an interior portion of the housing. ### Claim 15 (depends on 14) The dosing and mixing arrangement of claim 14, wherein a distal end of one of the louvers contacts the interior portion of the housing. ### Claim 16 (depends on 13) The dosing and mixing arrangement of claim 13, wherein the mixing tube arrangement is offset within the housing to define a high pressure zone and a flow zone. ### Claim 17 (depends on 13) The dosing and mixing arrangement of claim 13, wherein the mixing tube arrangement defines the outlet of the housing. ### Claim 18 (depends on 13) The dosing and mixing arrangement of claim 13, wherein at least a portion of the louvered region faces towards the inlet. ### Claim 19 (depends on 13) The dosing and mixing arrangement of claim 13, wherein the non-louvered region faces away from the inlet. ### Claim 20 (depends on 13) The dosing and mixing arrangement of claim 13, an area of the louvered region extends over about 270° of the circumferential surface of the tube body.