# US 10,369,533 B2 · 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 10,369,533 B2 - Document ID: US10369533B2 - Status: Granted - Kind: B2 - Application number: 15/021,567 - Filed: 2014-09-12 - Published: 2017-10-05 - Granted: 2019-08-06 - 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/US10369533B2 ## 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 continuous circumferential distance of the tube body and the non-slotted region extending over a second continuous circumferential distance of the tube body, the second circumferential distance being less than the first circumferential distance, and the second continuous circumferential distance being larger than a circumferential distance of any portion of the tube body extending between two adjacent slots at the slotted region, and the width of each slot being less than half of the second continuous 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 the 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 1.5 to 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 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 45°. ### Claim 7 (depends on 1) The mixing tube arrangement of claim 1, wherein the slotted region extends along 210° to 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 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 0.05 to 0.15. ### Claim 10 (depends on 9) The mixing tube arrangement of claim 9, wherein the ratio of the circumferential width of each slot to the diameter of the tube body is 0.1. ### Claim 11 (depends on 1) The mixing tube arrangement of claim 1, wherein a diameter of the tube body is 5 inches, a circumferential width of each slot is 0.45 inches and a length of each slot is 8 inches. ### Claim 12 (depends on 11) The mixing tube arrangement of claim 11, wherein the slots define 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 continuous louvered region and a continuous 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 non-louvered region having a circumferential width that is larger than a circumferential width of a portion of the tube body extending between two adjacent louvers at the louvered region, 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, each slot having a common width defined along a circumference of the tube body. ### 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 at least a portion of the non-louvered region faces away from the inlet. ### Claim 20 (depends on 13) The dosing and mixing arrangement of claim 13, wherein an area of the louvered region extends over 270° of the circumferential surface of the tube body. ### Claim 21 (depends on 1) The mixing tube arrangement of claim 1, wherein the slotted region extends over a majority of an axial length of the mixing tube.