Patent GB-160954-A (GB)
Title: Improvements in reversing apparatus for furnaces
IPC: F23L15/02
Filed: 1920-01-06
Abstract: 160,954. Morgan, P. B. Jan. 6, 1920. Valves, reversing and like.-In reversing-valve apparatus for regenerative furnaces of the kind comprising a movable flue-connecting member such as a hood, the putting-on and cutting-off, more especially of the gas, is effected by a cover or valve i which is operated automatically by the movement of the hood &c. The invention includes special means for operating the hood and also, in one form, a reversal apparatus comprising a pair of duplicate units each functioning for both air and gas. In the simple form shown in Figs. 1 and 2, there is a gas valve for each end of the furnace and one air valve. Each valve comprises three aligned ports, of which, in the case of the gas valve:, Fig. 2, the outer supplies gas, the centre l<1> connects with the regenerator, and the inner l<11> conrects with the chimney. A mov.- able water-seal hood e covers the centre port and one of the end ports and each end port has a gravityclosing cover i, adapted to be opened by the engagement with its tail k of the rim of the hood as the latter enters its sealing position over the port and to close again before the seal is broken on reversal. In the position shown, gas is being supplied to the left-hand gas regenerator through the open cover i of the port l, while the cover i of the corresponding chimney port is closed, and at the right-hand end the gas port n is closed and hot gases are passing to the chimney through the opened port n<11>. An adjustable stop i<1> determines the amount of opening of the gas-port cover i, while in the case of the air valve each cover i has an adjustable opening in it through which, when the cover is closed, a regulated supply of air is admitted to the furnace. The hood e is mounted on parallel swing arms so as to be movable by a horizontal pull or push and its initial movement is helped by the reaction of the cover i and may be further assisted by a counterweight. In a modification, Fig. 4, the hood covers all three ports and instead of being shifted bodily to reverse is merely rocked slightly. In a modification of the arrangement shown in Fig. 1, the two gas valves are combined in the form of two connected hoods operating over five aligned ports. In the form shown in Figs. 6 and 9 there are only two reversing-valves which are identical, and each functions for both air and gas; a simpler arrangement of underground flue construction is also possible. Each valve comprises a double hood u, u<1> operating over five aligned ports of which, in the position shown (cor. responding to the right-hand end of Fig. 6), v is supplying gas, y is supplying air in quantity regulated by the damper 16 and chain 17 and the two chimney ports x are closed. The hoods u, u<1> are removably mounted in a frame z carried on the long arms of bell-crank levers 3 the short arms of which are oppositely disposed and connected by springs in such a way as to provide most of the initial force required on reversal. The relatively small starting force may be provided by a small motor acting through a crank arm and gearing. Similar results to those last described are obtained with four aligned ports at each end of the furnace by means of hoods which move vertically in deep water seals. In a further and last modification, Fig. 14, there are two single connected hoods e, one for each end of the furnace, each operating over a gas port 30, while dampers such as 32 in the underground flues control the connection to the chimney and regulate the amount of air.