Improvements in or relating to apparatus for controlling electrically-operated sluice gates or valves automatically in accordance with a water level

摘要

709,015. Automatic water level control systems. RANSOMES & RAPIER, Ltd. SNELL, M. H., and SPALL, G. W. July 3, 1952 [April 5, 1951], No. 7917/51. Class 38(4). In Fig. 6 a potentiometer Q controlled by a float (not shown) responsive to water level, and a potentiometer QSP1/SP controlled by the position of a sluice gate (not shown) controlling the level, are arranged in a bridge network to which a direct voltage is applied and which provides an output, on lack of correspondence between the position of the float and the gate, to energize, through thyratron valves P, the appropriate relay H or HSP1/SP to cause a reversible electric motor (not shown), adjusting the gate, to run in the correct sense to restore correspondence and maintain water level at a desired value. Means are provided to maintain the motor in operation for a predetermined time or until it has effected a predetermined movement of the gate. In a modification, Fig. 4, particularly suitable when the float and gate are miles apart, movement of the float controls through a spring K5 the position of one moving coil K3 relative to its magnet K4, while movement of the sluice gate controls the position of the other moving coil K3 in a similar manner. Each coil K3 moves a contact K6 relative to opposed contacts K7 and K8 to control the bias of a thermionic valve L, the anode current of which, passing through the coil K3, re-centres contact K6. The anode currents of the valves L which are thus indicative of the position of float and gate respectively are applied differentially to a two-way relay F2 controlling the relays H, HSP1/SP. In further modifications: (a) the output of a bridge circuit including potentiometers operated by the float and gate respectively is applied directly to a two-way moving-coil relay controlling the relays H, HSP1/SP; (b) potentiometers operated by the float and gate respectively are arranged with rectifiers in a circuit to which an alternating voltage is applied and which provides a D.C. output component to operate a two-way relay controlling the relays H, H'; (c) the float and the gate vary an inductance and a capacity respectively in a resonant circuit to which an alternating voltage is applied and which provides an A.C. output to A.C. operated thermionic valves differentially controlling the energization of a two-way relay controlling the relays H, HSP1/SP; (d) the float and the gate operate selsyn transmitters connected to a differential selsyn movement of the rotor which operates contacts corresponding to those of the relays H, HSP1/SP Specification 347,976, [Group XXXVII], is referred to.