Patent GB-190107476-A (GB)
Title: Improvements in and relating to Steam Generators for use on Mechanically Propelled Road Vehicles, Steam Vessels and the like, and in Meands for Automatically Controlling the Supply of Water and of Heat thereto.
Inventor: SMITH JOHN
Filed: 1901-04-11
Granted: 1901-10-19
Abstract: 7476. Smith, J. April 11. Feedwater, controlling; instantaneous generators. - Relates to means for controlling the supply of feedwater and liquid fuel in steam generators for motor cars, tramcars, launches, and the like. A special form of coiled - tube instan - taneous steam generator is also described but not claimed. The invention is particularly applicable in connection with instantaneous steam generators and liquidfuel burners of the kind described i n Specifications Nos. 24,025 and 27204, A.D. 1896, and No. 23,718, A.D. 1898, [Abridgment Class Furnaces &c.]. According to one arrangement, shown diagrammetrically in Fig. 1, the feed-pump and a pump (not shown) for compressing air by which the supply of liquid fuel is induced are operated together by a small independent motor (not shown) worked by steam, or a mixture of steam and water, taken from the generator by the pipe n at the normal water level. Excess of feedwater is thus removed. The supply of steam, or steam and water, to work the motor is controlled according to the pressure of air in the reservoir 8 by a piston and spring regulator, the piston of which is counterbalanced to neutralize the vibration of a motor car. The supply of compressed air to the burners j for inducing the supply of fuel is controlled according to the pressure in the steam drum of the generator by the regulator 37, and, according to the temperature of the generator, by the regulator 36 operating as described in Specifications Nos. 24,025 and 27,204, A.D. 1896. The number of burners in operation is controlled in accordance with the pressure of the compressed air by a regulator o of the kind described in Specification No. 23,718, A.D. 1898, [Abridgment Class Furnaces &c.]. The liquid fuel is drawn from an auxiliary reservoir p fitted with a float valve for maintaining a constant level. Fig. 5 shows in plan the auxiliary motor, the pumps, and air reservoir. The motor cylinder y has its valves beneath it to allow water to drain away. The air pump 6 is worked directly, but the feed-pump 18 is worked from the shaft 10. The air reservoir 8 forms the bed-plate of the whole. The pumps are worked by hand at starting by means of the arm 51 engaging the pin 52, but when the motor begins to work, as soon as sufficient steam is generated, the arm 51 is thrown out of gear by the screw 46. In a modified arrangement, the auxiliary motor is controlled by a centrifugal governor, and the suction of the feed-pump is controlled according to the pressure in the air-supply pipe between the regulators 36, o. In another modification, the air pump delivers into the liquid-fuel reservoir to force the fuel therefrom, and the regulators 36, 37 are on the fuel-supply pipe, the fuel thus serving to transmit the varying pressure of the air. The feedwater regulator is also connected to the fuel-supply pipe beyond the regulator 36. An electric motor or an explosive gas or vapour engine may be employed to operate the feed-pump and air compressor, or the feed-pump may he worked by the main engine. The application of the apparatus in connection with a flame-tube vertical boiler is illustrated in the Specification. Fig. 2 shows a coiled-tuhe instantaneous generator consisting of a continuous tube arranged in several coils. The water first passes through an elongated vertical coil a, shown in end elevation, then through a similar coil a', then through a larger coil a', then through a small horizontal coil c surrounding the steam drum m, and finally through a larger horizontal coil e, whence the steam and water enter the drum m. The heated gases from the burners j first heat the coil a', then pass between the coils c, e, and finally descend through the coil a. The air supply to the burners passes through the hollow casing f.