US2326559A - Alarm mechanism - Google Patents

Description

' Aug. 10, 1943.

W. E. PROCTOR ALARM MECHANI SM Filed March 20, 1941 71627 ZwzaZP/ac Patented Aug. 10, 1943 12,326,559 p I ALARM MECHANIS h v Wiiliarn Procter, Baltimore, lt'lld. Q h "Applicationlliarch 2c, 1941, seam... 324,386

8 claims; (Cl. 122 451 v This invention relates to alarm mechanisms and has for its principal object the provision or a marine gauge board alarm, the instruments of which are pneumatically controlled by the water level in the boiler. l Q I A further objectof the present inventionis to provide a pressure regulator in which the sampling pipe extends directly into the, boiler drum whereby the device is suited for marine installations. .5 f u I A still further object 'of theinvention' is to. devise a marine regulator governed by the water linein the boiler and suited to use' wherever the pressuresrun relatively high and there is a rolling-of the support, bothof which cause condie tions under which theJ'rOrmalland regulator is quite unsatisfactory or even inoperative. f Marine regulators of thegeneral type illustrated herein dependv for successful operation upon a'constant escape of steam or water from the boiler. It is one object of the present invention' to prevent the loss of this water and inso doing to save the appreciable'numbe'r of B. t. u.s in the water heretofore wasted. Likewise, while low and high water and pressure have been'r'ecorded on gauge boards in the engine rooms of ships these control boards have been heretofore operated by an electrical relay." In the present.

invention, the steam andjvzater pressure is conducted directly to the pressure gauge and to a pressure switch adjacent the .red, light or the warning horn or both signals. Inthedrawing: I Figure 1 is a diagrammatic assembly view showingitheregulator connecting with an alarm mechanism and also with a feed water control valve.

Figure 2 is an'enlargeddetail of'the regulating 7 element.

Figure 3 is a side elevation of the gauge board. In the drawing the numeral It representsthe shell of a boiler drum having a normal water line at H.

practice with this sharp distinction, however, that in the present case the sampling pipe l2 extends into the drum or boiler, whereas in land practice body of the valve preferably'below theshut off bit'of scale. The chainbe'rlil cominurncates'with- A sampling pipe. I ZeXtends approximately an inchbelow the normal water line as in land the invariable custom is to have the sampling?- pipe outside of the drum, usually parallelto the gauge glass. The sampling pipe may be in'two or more parts connected by the usual couplings and it preferably passes directly through thedry pipe illustrated as a circular cross-sectlon just below;

the top of the boiler drum l0. 1 a

The lower end M of the sampling pipe is open' and in the side there maybe a number of openings such'as' l5, usuallyone at the Water line and two above the water line, although in many cases I find that I must space the openings quite high above the water line because of the extreme changes in the level of the water on shipboard duetoj man timestam s of which the rolling of the ship is but one. The sampling pipe extension [6 may be threaded'as at .l'l. into the connection l8 iwhich'is required when it isheces sary to remove the. inlet orifice. lfiifor anypura pose as for examplewhen this'is .blockedqby' a the feed water controlv'alv'e 2i and the instrument board 22 through theconnection 2,3;lwhile the connection 24 1eadsthrough the pipe 2 5'to.

theffilter tank or heater thus providing 'ajclosed circuit forthe water and steam whichpassesthrough the valve. The" outer orifice 21 like the inlet orifice I9 is readily removable forreplace ment or cleaning. I

The pipe fisjleadingiromponnectionj 23 ca'r v ries, the. pressure directly to the feed water con trol valve 2! or other in'strumentality as well as to the instrument board, being'separately'con nected with the control valve 'pressur 'gaug'e '30 and the commercially obtainable pressure switches 3i and 32 operatingv respectivelyithe electric lamp 33, preferably a warning red color,

and the siren or other [alarm mechanism 35I'to make an audible signal inicasethe visible signal; 33 is not immediately notejdgfor this purpose vbe-' ingset .to respondt a greater variation from the normal water linelthan are the la'mp, controlling pressureswitches,jthat 'is, the switch" 3! is set to act at one chosen. pressure and the pressure switch 32 for the horn is'set to go into action at astilllower pressure.

, The operation of the apparatus has nothing to dofwith steam pressure, but is based solely oh'the fact'that the sampling pipe scums the surface of; the water, having a constant flow through it. The pressurein the drum Ill would be 50 pounds.

Because of the small 1 orifice as a general rule; inthe plug IS, the pressure incham'ber 2iiwo'ul'd only be about one-fifth that great. Ifgby any chance, the Water level"was.,very lowand .thef fluid passing through thesampling pipewere'dry steam, this could about as readily flow outfthe relatively larger orifice in, 2.7 as it couldfiow into thesmaller orif ce "in i9; hence the pressureiini chamber 2 9 would be a, minimum.

If, however, "andit is-is usually case, V fluid'passing up thesampling pipe'lfi is wet; the. friction" in passing through-the exit orifice plug v2! will be sufficiently great tobuild use very'lsubstantial,pressure iin the chamber Z2 6, about pounds forexampleTAs willreadilyfbei un er wh eiihe erhea se wa r 'pa'sse thru the orifice in. {9, the liquid; Will -evaporate; in part because of the much lower pressure in' chamber 29 than in the drum I0.

quantity of constant flow isjreasonably smallfbecause of the tiny sizeof the orifice in 19 which restricts the discharge from the high pressure The total

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