Patent GB-433608-A (GB)
Title: Improvements in soot blowers
IPC: F28G3/16
Filed: 1933-12-16
Abstract: 433,608. Soot blowers. BABCOCK & WILCOX, Ltd., Babcock House, Farringdon Street, London.-(Assignees of Snow, N. L. ; New Canaan, Connecticut, U.S.A., Thomas, W. P.; Highland Park, Brelsford, H. E.; Birmingham, Howse, C. L., and Bowers, F. ; Detroit, all in Michigan, U.S.A.) Dec. 16, 1933, No. 19935/35. Convention date, Dec. 27, 1932. Divided out of 432,792. [Class 99 (ii)] [See also Group XXVI] In a fluid-heater soot blower comprising a blower tube 13b, Fig. 1, adapted to be oscillated by a fluid pressure engine 82, cleaning fluid and pressure fluid are supplied to the blower tube and to the valve chamber 93 of the engine respectively from the same main 105 under the control of a spring-pressed valve 107 which is located in a conduit 106 leading from the main 105 to said chamber 93 and is associated with mechanism, including a cam 118, which is actuated manually to open the valve to operate the blower but is actuated automatically after a predetermined oscillation of the blower to close the valve. The engine 82 comprises a housing 81 provided with an inwardly-projecting lug 85 and locating a rotor 80 which is disposed centrally therein and has an integral vane 84 to span the annular chamber 83 formed between the said housing and rotor. Tapped into the housing on opposite sides of the projection 85 are conduits 86, 87 whereby liquid in cylinders 90, 91 connected thereto may be admitted alternately to the chamber 83 to act on opposite sides of the vane 84 to oscillate the rotor, pressure being applied to the liquid in said cylinders by the pressure fluid in the valve chamber 93. The chamber 93 is provided with pressure conduits 94, 95 leading to the cylinders 90, 91 and also exhaust conduits 96, 97, the flow through the conduits being controlled by a valve located in said chamber and constituted by a pair of pistons 98 which are mounted on a yoke 100 reciprocated by an arm 103 fixed for oscillation with the rotor 80 and are so arranged that when pressure fluid is being admitted to one of the cylinders 90, 91 the other cylinder is exhausting. The cam 118 of the actuating mechanism is fixed to a shaft 119 which is also provided with a fixed ratchet wheel 120, having teeth 121 adapted to be engaged by a pawl 122 located on the yoke 100 of the engine valve, and also a free sheave wheel 125 which carries a pawl 126 adapted to engage an enlarged tooth 127 of the ratchet wheel 120 and is rotatable by a chain having depending ends 128, 129. The end 129 of the chain passes through a stationary guide 130 against which an adjustably mounted collar 131 on the chain is adapted to abut to limit movement of said chain in one direction. The arrangement is such that upon pulling the chain end 129 the sheave wheel 125 is rotated in a clockwise direction to permit engagement of the pawl 126 with the tooth 127. The end 128 is then pulled, whereupon the wheel 125, ratchet wheel 120 and cam 118 are rotated in the opposite direction until the collar 131 engages the stop 130, the cam opening the valve 107 to admit pressure fluid to the valve chamber 93 of the engine and the pawl 122 riding freely over one or more of the ratchet teeth 121 depending upon the position of said collar. The engine will then oscillate, and with it the blower tube, until the pawl 122 rotates the ratchet wheel 120 and cam 118 to such an extent as to allow the valve 107 to close. At the same time a supply of cleaning fluid to the blower tube is permitted by a spring-pressed valve 112 which is located in the main 105 and is opened by pressure fluid from a branch 108 of the conduit 106 acting on a piston 110 secured to the stem 111 of said valve, the valve 112 closing again when the valve 107 closes.