Improvements in or relating to Means for Preventing the Racing of Marine Engines.

摘要

18,408. Davies, P. Aug. 5. F l u i d governors ; transmitting-mechanism. -The supply of steam to a marine engine is controlled by a governor dependent on the immersion of the rudder. A throttle valve Z1, Fig. 3, is connected to a frame Y, which carries an eccentric-wheel y2, adapted to be moved into the path of two continuously reciprocated screws I. An eccentric Q, driven from the engine &c., oscillates two saddle members O carrying the screws I. The eccentric - wheel is moved into the path of one of these screws by gearing from a wheel w2, which is operated either by bellows r2 or by two electric motors e2, f2. The bellows are open and attached to an air chamber o2, connected by a pipe n6 and swivel pipe n7 with a drain-chamber l2; a pipe A, Fig. 1, leading to the stern of the ship and open at its end B to the sea, is connected to this drain-chamber. The variation in the depth of immersion of the pipe A determines the opening and closing of the bellows, and the consequent position of the eccentric-wheel y2. Two spring-pressed valves p6, q6 on the airchamber o2 determine the maximum and minimum pressure in the pipe system, one valve opening outwards to atmosphere the other inwards. In a modification, two #-tubes containing mercury are connected to the drainchamber, the variation in pressure in the pipe A connecting one or other electric motor to a generator through the switches a2, d2 and the mercury in the #-tubes. A rod x2 attached to the pipe h6, throws over the switch d2 on a movement of the frame Y so as to put in circuit one motor, say, f2 to operate the eccentric-wheel and turn on steam, after the other motor has moved the valve owing to a variation in the immersion of the pipe A. In a further modification, the pipe A and two #-tubes are replaced by two pivoted floats mounted one above the other on the rudder; the upper float, in the form of a mercury switch, operates with the switches a2, d2 to put in circuit the motors e2, f2, while the lower float B1, Fig. 8, puts in circuit the motor f2 for turning on steam earlier than the upper float would. The float B1 comprises a hollow pivoted casing d5 containing the mercury switch d4, the casing having a hole d6; normally the casing is full of water, but when the sea falls, it empties and becomes buoyant. The leads to the bulbs pass through the hollow pivot f3.