GB348940A - - Google Patents

Abstract

348,940. Feedwater regulators for steam boilers. I. G. FARBENINDUSTRIE AKT.-GES, Frankfort-on- Main, Germany. June 30, 1930, No. 19876. Convention date, June 28, 1929. [Class 123 (ii).] The water level in a boiler is regulated by utilizing oscillations of the boiler, or an auxiliary container, which vary in frequency according to the level. In Fig. 1 a boiler 1 is connected elastically by tubes 2, 3 to an auxiliary container 4. The oscillations of the container 4, either produced by impulse or by the vibrations which usually occur in a boiler house, are indicated by a tongue frequency meter 5 and serve as a measure of the liquid level. The boiler 1 may be elastically supported, and the container 4 omitted. The oscillations of the container may be produced by impulses or blows either by hand or mechanically, or by an oscillation exciter which is adjusted to synchronize with the natural oscillations, e.g. by a tuned electric circuit. The oscillation exciter may have one or more constant frequencies, in which case the amplitudes of the forced oscillations developed vary according to the liquid level. The indications of the tongue frequency meter 5 may be transmitted to a distance by light rays, or by electrical means on the principle of the telephone. In another modification, Fig. 2, in which the liquid level is required to be kept at a level indicated by the tongue 7 of a frequency meter, selenium cells 9, 10 are exposed to light rays which are directed by the frequency meter 5. At least two adjacent tongues oscillate at the same time, the maximum amplitude passing from the tongue 7 to the tongues 6 or 8 according to the level variations. Light is directed to the cell 9 or 10 according to whether tongue 6 or tongue 8 possesses the greater amplitude, and each change in the balance of the Wheatstone bridge actuates a relay 12 which may control a feed pump. The change in the number of revolutions of the pump may act on a frequency meter 13, which may act on the cells 9, 10 in a direction to restore the balance. In another method for producing electrical oscillations from the oscillations of the container, the latter may influence electrical capacities or inductances in a circuit, and thermionic valves may be employed to actuate regulating apparatus at a distance.