Back to results
US 10,378,413 B2Granted
Urea mixer
AssigneeFord Global Technologies, LLC
InventorXiaogang Zhang
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for a urea mixer. In one example, a urea mixer may include a tube for mixing exhaust gas with urea outside of a main exhaust passage.
Claims18
A mixer comprising:
- a concave plate located inside an exhaust passage with an opening fluidly coupling the exhaust passage to an auxiliary passage having a urea injector, and where the auxiliary passage is fluidly coupled to a hollow ring physically coupled to an outer surface of the exhaust passage, and where the hollow ring is upstream of the concave plate relative to a direction of incoming engine exhaust gas flow, the hollow ring fluidly coupled to the exhaust passage via a plurality of perforations circumferentially surrounding the exhaust passage,
- wherein the auxiliary passage is formed by a J-shaped tube comprising a first tube, a second tube, and a third tube, and where a diameter of the auxiliary passage is less than a diameter of the exhaust passage, and
- wherein the first tube is located inside the exhaust passage and is physically coupled to the concave plate and a portion of the second tube located in the exhaust passage, the urea injector is located at an intersection between the third tube and the second tube outside of the exhaust passage, and where the third tube is entirely located outside of the exhaust passage and is physically coupled to a downstream surface of the hollow ring.
A method comprising:
- injecting a reductant outside of a main exhaust passage into a tube of a mixer configured with an opening in a downstream portion of the mixer in the main exhaust passage to conduct exhaust gas into the tube for mixing with the reductant outside the main exhaust passage;
- flowing the reductant and exhaust gas parallel to and outside of the main exhaust passage via the tube into an upstream hollow ring portion of the mixer, wherein the tube is physically coupled to a downstream surface of the upstream hollow ring portion of the mixer, the downstream surface of the upstream hollow ring portion of the mixer being perpendicular to an outer annular surface of the upstream hollow ring portion of the mixer, and wherein the upstream hollow ring portion of the mixer is physically coupled to an outer surface of the main exhaust passage;
- and
- flowing the reductant and exhaust gas out of the upstream hollow ring portion of the mixer and into the main exhaust passage via a plurality of perforations circumferentially surrounding the main exhaust passage, the plurality of perforations configured to angularly expel the reductant and exhaust gas into the main exhaust passage.
1 more element
A urea mixer comprising:
- a curved downstream portion and an annular upstream portion cascaded along an exhaust pipe of an exhaust passage, where the upstream portion is a hollow ring located outside of the exhaust pipe and physically coupled to an outer surface of the exhaust pipe, and where the downstream portion is located interior to the exhaust pipe;
- a first plurality of perforations circumferentially surrounding a portion of the exhaust pipe corresponding to a location of the upstream portion, where the first plurality of perforations fluidly couple the upstream portion and the exhaust pipe, and a second plurality of perforations located along the downstream portion;
- and
- an injector positioned to inject urea outside the exhaust passage along a vertical axis parallel to a central axis of the upstream portion into a tube, the tube coupling the curved downstream portion and the hollow ring, wherein the tube is physically coupled to a downstream surface of the hollow ring, the downstream surface of the hollow ring being perpendicular to an outer annular surface of the hollow ring.
1 more element
Dependencies are inferred from the claim text.