초록 ▼

A long retracting sootblower for boiler cleaning of the type having a lance tube which is advanced into and out of a boiler and simultaneously rotated, and having one or more nozzles discharging a jet of blowing medium which trace helical paths. An indexing mechanism is provided to change the positi

A long retracting sootblower for boiler cleaning of the type having a lance tube which is advanced into and out of a boiler and simultaneously rotated, and having one or more nozzles discharging a jet of blowing medium which trace helical paths. An indexing mechanism is provided to change the positioning of the helical paths traced by the nozzles between successive actuation cycles to minimize boiler erosion and mechanical stress caused by repeated blowing medium impact against surfaces within the boiler. the indexing mechanism includes relatively slidable longitudinal advancement rack sections which cause the engaging pinion gears to index by one or more teeth upon each actuation cycle. A movable rack portion is biased by a compliant element to remain in a normal position until initial advancement of the lance carriage which causes the movable portion to be indexed with respect to the fixed portion of the rack. The movable rack portion returns to its normal position during other periods of the actuation cycle thereby providing said indexing.

대표청구항 ▼

A sootblower having a lance tube with one or more nozzles for projecting a stream of blowing medium against surfaces within a boiler, said lance tube being periodically advanced into and out of the boiler and simultaneously rotated such that the stream of blowing medium projecting from the nozzle tr

A sootblower having a lance tube with one or more nozzles for projecting a stream of blowing medium against surfaces within a boiler, said lance tube being periodically advanced into and out of the boiler and simultaneously rotated such that the stream of blowing medium projecting from the nozzle traces a helical path, said sootblower comprising; drive train means for driving said lance tube to undergo said longitudinal and rotational motions in a synchronized manner thereby causing said nozzles to trace said helical path, and indexing means for displacing the position of said helical path from one sootblower actuation cycle to another such that the helical paths traced by said nozzle are longitudinally offset between said actuation cycles.