Mounting assembly for reductant injector with thermal isolation and sealing gasket

摘要

A mounting assembly for an injector is located in a curved portion of an exhaust line having an exhaust flow from an upstream end to a downstream end. The mounting assembly includes an indent extending at least partially into the exhaust line curved portion and disposed in the exhaust flow. The downstream wall has an interior surface oriented to substantially face the exhaust line downstream end. A recess extends from the downstream wall in a direction away from the exhaust line downstream end, and a recess aperture is formed in the recess and configured to fluidly communicate with the injector. The recess reduces the amount of exhaust heat reaching the injector tip.

主权项

1. An injector mounting assembly for an injector of an engine exhaust after-treatment system, the injector including a mounting end having a plurality of mounting feet disposed in spaced relationship to each other, a tip with a nozzle disposed between the plurality of mounting feet, and a sealing plate defining a nozzle opening and mounted to the tip such that the nozzle opening is aligned with the nozzle, the plurality of mounting feet each including a distal mounting surface, the injector mounting assembly comprising:
an exhaust line defining a passageway having an upstream end and a downstream end in fluid communication with the upstream end, the exhaust line adapted to receive an exhaust flow from an engine at the upstream end and to discharge the exhaust flow from the downstream end, the exhaust line including an exterior surface having a mounting surface with a plurality of mounting bosses projecting therefrom and a sealing surface defining an injector passage, the plurality of mounting bosses each including a distal mounting face, the plurality of mounting bosses and the injector passage configured such that, when the injector is mounted to the exhaust line, the distal mounting surface of each of the plurality of mounting feet is respectively aligned with a corresponding distal mounting face of the plurality of mounting bosses and the injector passage is in fluid communication with the nozzle of the injector such that reductant emitted from the nozzle of the injector enters the exhaust line and travels in an exhaust flow direction toward the downstream end; and a gasket mounted to the exhaust line, the gasket defining a nozzle aperture therein, the nozzle aperture aligned with the injector passage of the exhaust line, and the gasket configured such that, when the injector is mounted to the exhaust line, the gasket is interposed between the distal mounting surface of each of the plurality of mounting feet and the corresponding distal mounting face of the plurality of mounting bosses of the exhaust line, the gasket is interposed between, and in sealing engagement with, the sealing surface of the exhaust line and the sealing plate of the injector, and the nozzle aperture of the gasket is aligned with the nozzle of the injector.