Patent GB-166216-A (GB)
Title: Improvements in dumping and the like valves for furnace grates
IPC: F23H11/18
Filed: 1919-04-23
Abstract: 166,216. Bennis, A. W. April 23, 1919. Ashes, removing. - An ash-dumping valve for discharging ashes which accumulate at the rear of mechanical grates is constructed in the form of a rotary drum having a diametral passage, uniform or tapering in width. Figs. 1 and 2 show an elevation and a plan of two such valves adapted to be operated simultaneously, and Fig. 4 shows a transverse section of the valve. Fig. 5 shows a transverse section of the bearing between the two valves. The segmental portions 1 and 2 of the valve are formed hollow for the passage of air for cooling purposes and are connected to, and communicate with, hollow end plates 3 which in turn communicate with the hollow shafts 4 mounted in hollow bearing boxes 5 and supported on anti-friction wheels 6 or roller or ball bearings. The upper segmental portion 1 comprises a lateral flat supporting-plate 7 to which is bolted one or more curved plates 8 adapted to be readily renewed when worn out. The lower segmental portion 2 comprises one or more renewable flat plates 10, which become worn by the discharge of ashes, bolted to the curved supporting-plate 11. Bolts secure the plates 7, 11 to the end plates 3. The interior portions of the end plates 3 forming the ends of the passage through the drum may be provided with detachable plates 18 adapted to allow for expansion. Hand-hole doors 19 for gaining access to the interior of the hollow end plates are provided in the detachable plates 18. To prevent ashes from falling into the interior of the upper segmental portion 1, the plates 8 are provided with lips which dip into curved troughs 24 forming part of the supporting-plate 7. The two valves shown in Figs. 1 and 2 are connected by a hollow interlocking block 15 or other device, and are rotated to discharge ashes by a lever or other operating mechanism attached to an extension 14 of the shaft 4. If desired, each valve may be operated independently, in which case the interlocking block 15 is omitted. The air for cooling purposes is supplied to the central bearing box 5, enters through apertures in the hollow shafts 4, and passes through the hollow end plates to the upper or both the upper and lower hollow segmental portions of the valve. It then passes through the outer end plates 3 to the outer hollow shafts 4 and shaft extensions 14, where it may escape to the atmosphere or other place for use. The air may be forced through the drums in other directions than those stated above. Part nf the air supplied to the central bearing-box 5 passes through passages 25, Fig. 2, to boxes 22 in the rear wall and escapes to the atmosphere or elsewhere through outlets 26. Air also passes from the end bearing-boxes 5 to extensions of the boxes 22 and escapes through apertures 27. The brickwork above the boxes 5 and 22 is supported on plates 17, Fig. 1, and 30, Fig. 5, respectively, which are kept cool by the air circulating through the boxes. The plates 17 also overlap the drums and form sealing means for air and ashes. Fig. 4 shows hollow dumping-plates at the rear end of a travelling grate as described in Specification 166,163. The air entering the dumping-plate 32 at 40 passes into the box 33 and may be used for cooling the ash valves or drums and plates 17, 30. Deflecting and guiding ribs may be provided on the parts enclosing the air passages, and the air may be forced through the passages by blowers or steam-jets.