Patent GB-190812158-A (GB)
Title: Improvements in Locomotive Boiler Furnaces.
Inventor: WALKER ROBERT LOUDON
Filed: 1908-06-04
Granted: 1909-01-07
Abstract: 12,158. Walker, R. L. June 4. Steam - generator furnaces; smoke-consuming ; dampers.-A locomotive boiler fire-box is divided at its front portion into two compartments by a central vertical water-leg 5 surmounted at the rear by an arch 4 and at the front by a pivoted damper 7 provided with a circuitous passage 8, through which feed-water or water from the boiler is circulated. The damper is operated by steam or by hand, and causes the gases from one compartment to pass round the rear of the water-leg and over the fire in the other compartment so as to consume smoke in the manner described in Specifications No. 3292, A.D. 1882, and No. 3487, A.D. 1890. At the rear end of the boiler, the shaft 10 of the damper is supported by rollers 20 mounted upon a plate 33 which is secured to the boiler casing by bolts 32. Between plates 14, 16 which are loosely mounted upon the shaft 10 are provided bearing-surfaces 15, Fig. 2. The plate 14 is supported by the bolts 32 and the plate 16 is held in place by a spring 17 which presses at the other end upon a cog-wheel 48 secured to the shaft 10. By adjusting nuts 106 upon the bolts 32, the plate 14 &c. may be moved forward and the trunnion 21 at the other end of the damper pressed upon its seat in a saddle 22. To operate the damper 7 by means of steam, the cog-wheel 48, Fig. 4, meshes with a rack 47 connected to crossheads 37, 38, which are operated by means of steam delivered to a cylinder 34 through an inlet valve 110 and a three-way valve 43. The damper may be prevented from moving too rapidly by an hydraulic cylinder 40, having its piston-rod 39 secured to the cross-heads 37, 38 and its ends connected by a valved pipe 45. Instead of, or in addition to, this hydraulic cylinder, a buffer spring 114, Fig. 1, may. be employed to retard the movements of the damper. An eye-bolt 122, carried by a plate 113 which bears against the spring, is connected by a chain 111 to an arm 13 secured to the damper shaft 10. To operate the damper by hand, a lever 131, Fig. 6, loosely mounted near the arm 131 upon the shaft 10, is provided with a latch 134 which may engage notches 137 in the cam 13. Water from the boiler passes through a pipe 107 into the water-leg 5, and through an opening 108 into the external compartment of the saddle 22, and escapes therefrom to the boiler by a pipe 23. Pipes 124, Fig. 5, may be provided as additional outlets from the leg 5. Steam circulating-pumps 27, 127, Fig. 1, are mounted on a plate 103 riveted to a flange 102 on the boiler, and deliver water from the boiler connexion 30 into a pipe 26 having a reduced end 31. Water from the boiler enters a perforated pipe 25 fitted around the pipe 26, and passes through a pipe 24 into the inner compartment of the saddle 22, and through the damper 7 to a pipe 11 which is provided with a packing-ring 12 and delivers to the top of the boiler. To pass feed-water through the damper, an injector 140 having a supply pipe 143 is connected to the pipe 26, and valves 141, 142 are provided to prevent water from passing from the pumps 27, 127 into the injector and vice versa.