Improvements in or relating to liquid pressure remote control systems for operating soot blowers of boilers and the like

摘要

538,879. Soot blowers; hydraulic apparatus. AUTOMOTIVE PRODUCTS CO., Ltd., and CLENCH, E. C. S. Feb. 16, 1940, No. 2937. [Class 99 (ii)] [Also in Group XXIX] In an hydraulically-operated soot blower system, liquid pressure from a supply line 12 is directed by a change-over valve 13a, Fig. 1, to a distributing-valve 19a causing the reciprocation of a piston operating a blower nozzle, and after a certain number of strokes of the piston, the valve 13a is operated to direct the liquid to similar valves 13b, 19b of a second blower, and these in turn to valves 13c, 19c of a third blower, and so on, the liquid pressure being returned by a line 147 to the supply tank 11 after the last blower has been operated. Fig. 2 shows one set of valves 13, 19, the valve 13 comprising ball valves 21, 24 actuated by rockers 30, 31 which are moved by a frame 37 swinging on links 38, 39 and held in either of two positions by a catch 40 engaging notches 42, 43. The valve 19 comprises a piston valve 60 which is reciprocated by a piston 75 through slotted links 63, 72 and a lever 66, which is snapped over from one side to the other of its dead centre by a spring 68. The valve 60 distributes the liquid pressure alternately to opposite sides of a piston 111, 112, Fig. 3, which oscillates the blower 100 through rack and pinion gear 108, 109, a ratchet 105, and gears 102, 103. The valve 60 carries a pawl 18 engaging a ratchet 55 on a plunger 51, which is formed with an abutment 54 for engaging the frame 37. When the plunger 51 is pushed to the left, as shown, by means of a knob 53, the valve 13 takes up the position shown, so that liquid pressure entering at 45 passes the valve 23 into passage 47, which is connected by a line 95a, Fig. 1, to a passage 94 in the valve 60. The liquid thus flows through passages 86, 93 to a line 15a connected to the right-hand side of piston 112, which is thereby moved to the left to oscillate the blower. At the end of the stroke, the piston 111 opens a valve 118, so that pressure from the line 15a flows through conduits 130, 124, valve 127, and line 16a to a passage 91 in the valve 60, and thence by passages 83, 80 to the right-hand side of piston 75, which is thereby operated to reverse the position of the valve 60. In this reversed position, the valve 60 admits liquid to the line 14a and causes a return stroke of the piston 111, 112, which at the end of the stroke opens valve 119 to pass the liquid by conduits 131, 125 and valve 128 to the line 16a and the opposite side of the piston 75, bringing the valve 60 back again to the position shown. At each stroke of the valve 60 to the right, the pawl 18 moves the plunger 51 one notch, until the abutment 54 contacts with the frame 37, moving it to the right so as to reverse the position of the valves 21 .. 24 and cause the liquid pressure to be supplied by a line 146, Fig. 1, to the second set of valves 13b, 19b. After these have operated the second blower, the liquid passes by a line 148 to the third set of valves 13c, 19c, and so on. In the case of a retractable blower nozzle, the piston 111, 112 operates the screwed shaft of the blower through. similar rack and pinion gearing without a ratchet, the first and last strokes of a series of, say, six reciprocations of the piston being longer than the intermediate ones, for the full extension and retraction of the blower nozzle. The valves 118, 119, 127, 128 are then operated by rocker levers and a grooved cam drum oscillated by the pistons. When pressure liquid is supplied to a particular blower, electric switches 153, Fig. 1, may be operated thereby, so as to light up indicator lamps 151a, 151b, 151c. Also when the pressure in the supply line 12 becomes excessive, a warning-device 154 may be operated thereby as described in Specification 538,883, [Group XXXVII]. Specifications 538,880, 538,881 and 538,882 also are referred to.