Patent GB-287870-A (GB)
Title: Improvements in or relating to automatic oil control for carburetted water gas machines
IPC: C10J1/213
Filed: 1928-03-16
Abstract: 287,870. Humphreys & Glasgow, Ltd., (Assignees of Parsons, M.). March 28, 1927, [Convention date]. S w i t c h e s, actuating; motor actuation. - Automatic oil control for 'carburetted water gas plant comprises a calorimeter to measure the calorific value of the carburetted water gas produced and a galvanometer system responsive to the calorimeter and balanced at the standard calorific value of the gas, but unbalanced and operative, upon departure from that calorific value, to vary the oil supply to the carburettor. Water gas from the generator 1 passes to the carburettor 2, the carcarburetted gas leaving a relief holder 6 by a pipe 7 from which a sampling pipe 10 leads to a burner 13 to which combustion air is supplied by an inlet 12. Heat is absorbed from the burner by air admitted through an opening 14 and discharged through an outlet 15, resistance thermometers 16, 17 being placed in the air inlet and outlet, the difference indicating the calorific value of the gas sample. These thermometers form two legs of a Wheatstone bridge, the other two legs being resistances 18, 19 with a standardizing resistance 21 for balancing at zero a galvanometer 20. A resistance wire on a drum 22 is connected in variable proportions with the thermometers 16, 17, and a battery 23 supplies current for operating the galvanometer, which is deflected to the right or left according to the temperature difference beween the thermometers. A motor 26 drives continuously a shaft 27 carrying cams 33, 34, and when the galvanometer pointer 24 is deflected to the right or left these cams are brought into operation to actuate a clutch 32 which engages with a disc 35 and moves it to a new position. On the shaft 36 of the clutch disc is also mounted the resistance drum 22 so that movement of the disc 35 turns the slide wire drum and changes the proportion of the slide wire in series with the thermometers 16, 17 and tends to return the galvanometer to zero where it remains until the next change in temperature is indicated by the two thermometers, when the operation is repeated. A pen 38 attached to the disc 35 records on a paper 39 a line showing the calorific value of the gas. A cam 51 on the shaft 36, on rotation of the disc when the gas sample is above or below normal, is moved to operate finger switches 65, 71. The oil pipe 45 is wide open during oil admission and the oil supply is controlled by mechanism for the automatic control of the water gas operation. A motor 83 drives through gearing, cam 90 on which a bell crank 91 rides, and on rotation of the cam falls into a notch and moves the piston of a four-way valve 94 which controls a hydraulic cylinder 97 operating the oil valve 98. Cam 99 times the operation of the bell crank 100, which reverses the flow through the valve 94 and closes the oil valve 98. This cam is attached to a sleeve 113 free on the shaft 84 to which is keyed gear 102 which drives differential gears 103, 104, 105. Gear 106 is fixed on sleeve 107 which is free on shaft 108. but held by the casing 109. Electric power from line switch 52, due to cam mechanism 51, 63 actuates either of solenoids 67, 73 according to whether calorific value of gas is higher or lower than that required and causes rotation of toothed wheel 69, which advances or retards cam 99 to shorten or lengthen the time during which the oil valve 98 is open. The Specification as open to inspection under Sect. 91 (3) (a) describes also a method of operating the oil valves, in which, in conjunction with a hand operated valve 46, other valves 47, 48 are arranged to be opened or closed by solenoids so as to vary the flow, the solenoids being controlled by finger switches 49, 50 actuated by the cam 51. This subject-matter does not appear in the Specification as accepted.