Sootblower with travelling limit switch
AssigneeCombustion Engineering, Inc.
InventorH. Davis Wall
Life of this patent
Estimating the term…
Abstract
A retractable sootblower, having a movable carriage and lance tube assembly for cleaning inside surfaces of a boiler, includes a stationary starter switch for initiating operation of the sootblower and a cable disposed between the movable assembly and the starter switch for transmitting electrical current from the starter switch to the moveable assembly. A limit switch is mounted to and moveable with the moveable assembly. A stationary switch control device is disposed proximate the boiler and configured to cooperate with the limit switch so as to reverse the direction of movement of the moveable assembly during sootblower operation by reversing the direction of the current to the movable assembly.
Claims23
A retractable sootblower, having a movable carriage and lance tube assembly for cleaning inside surfaces of a boiler, comprising:
- a stationary starter switch for initiating operation of the sootblower;
- a power cable disposed between the movable assembly and the starter switch and configured to transmit electrical current from the starter switch to the moveable assembly;
- a limit switch mounted to and moveable with the moveable assembly;
- and
- a stationary switch control device disposed proximate the boiler and configured to cooperate with said limit switch so as to reverse a direction of movement of the moveable assembly during sootblower operation by reversing the direction of the current to the movable assembly.
A retractable sootblower for cleaning inside surfaces of a boiler, comprising:
- a movable carriage;
- a lance tube moveable with the carriage so as to be inserted into and withdrawn from the boiler;
- and
- a limit switch moveable with the carriage and configured to limit movement of the carriage during operation of the sootblower;
- wherein, with the sootblower in a non-operational state, the carriage is positioned such that the limit switch is distal to said boiler.
A retractable sootblower for cleaning inside surfaces of a boiler, comprising:
- a movable carriage;
- a lance tube moveable with the carriage so as to be inserted into and withdrawn from the boiler;
- a limit switch moveable with the carriage and configured to limit movement of the carriage between a parked position distal to the boiler and a lance tube inserted position proximate to the boiler during operation of the sootblower;
- a power cable configured to transmit electrical current to the carriage and having one end moveable therewith and another end stationary with respect thereto;
- and
- a cable support assembly configured to support said cable during movement of the carriage between the parked and the lance tube inserted positions.
A method of operating a retractable sootblower to clean inside surfaces of a boiler, the retractable sootblower having a carriage, a lance tube and a limit switch which limits the travel distance of the carriage, comprising the steps of:
- moving the carriage from a first position distal to the boiler to a second position proximate to the boiler, to thereby insert the lance tube into the boiler;
- and
- moving the limit switch with the carriage.
Dependencies are inferred from the claim text.