Apparatus, system, and method to provide air to a doser injector nozzle
AssigneeCummins Filtration IP, Inc.
InventorsTory Jaloszynski, Tim M. Doyle, Matthew L. Anderson
Life of this patent
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Abstract
An apparatus, system, and method are disclosed for providing air to an injector nozzle. An injector nozzle is in fluid communication with a dosing fluid input. An opening substantially circumscribes the injector nozzle. The injector nozzle is directed toward the opening, injecting a fluid from the dosing fluid input through the opening. An injector air output is in fluid communication with an air input port and with the opening. The injector air output is directed toward the opening, injecting air from the air input port through the opening. The injector air output creates a positive air pressure around the injector nozzle.
Claims30
An apparatus for providing air to an injector nozzle, the apparatus comprising:
- a dosing fluid input port;
- an air input port;
- an injector nozzle in fluid receiving communication with the dosing fluid input port and fluid injecting communication with a space;
- and
- an injector air output in air receiving communication with the air input port and air injecting communication with the space, wherein the injected air does not interfere with the injected fluid and reduces the buildup of contaminants on the injector nozzle.
A system for providing air to an injector nozzle, the system comprising:
- an exhaust conduit comprising an interior;
- an air source comprising an airflow;
- a fluid source comprising a dosing fluid;
- an injector nozzle coupled to the exhaust conduit, the injector nozzle in fluid communication with the fluid source and with the interior of the exhaust conduit, the injector nozzle injecting the dosing fluid into the interior of the exhaust conduit;
- a cavity substantially circumscribing the injector nozzle;
- and
- an injector air output in fluid communication with the air source and with the cavity, the injector air output injecting air from the airflow into the cavity creating a positive air pressure around the injector nozzle;
- wherein the injector nozzle injects the dosing fluid into the interior of the exhaust conduit non-concurrently with the injection of air into the cavity.
An apparatus for airflow control of a doser injector to control nozzle tip obstruction, the apparatus comprising:
- a doser injector comprising a dosing fluid input and an air input;
- an injector nozzle disposed on the doser injector, the injector nozzle receiving a hydrocarbon fuel from the dosing fluid input and injecting the hydrocarbon fuel into an exhaust stream during a dosing event;
- a cavity disposed on the doser injector, the cavity substantially circumscribing the injector nozzle;
- and
- an injector air output disposed within the cavity, the injector air output receiving air from the air input and directing a substantially constant flow of air into the cavity, the injector air output directed at an angle that is substantially parallel to a surface of the cavity, the angle offset from the injector nozzle, the flow of air creating a positive air pressure in the cavity without interfering with the injected hydrocarbon fuel.
A method for providing air to an injector nozzle, the method comprising:
- receiving an airflow;
- receiving a dosing fluid;
- injecting the dosing fluid through an injector nozzle into an exhaust stream during a dosing event;
- and
- directing the airflow past the injector nozzle during a non-dosing event.
An apparatus for providing air to an injector nozzle, the apparatus comprising:
- means for receiving a dosing fluid;
- means for injecting the dosing fluid into an exhaust stream;
- means for creating a positive air pressure around the means for injecting the dosing fluid into the exhaust stream, wherein the positive air pressure is created when the means for injecting the dosing fluid is not injecting the dosing fluid into the exhaust stream.
Dependencies are inferred from the claim text.