Патент USA US2370103код для вставки
Fèb. 20, 1945. N. F. ZAPF 2,370,103 v INDICATING MEANS FOR PUMPS Filed July 15, 194s [email protected] Ü rm rm . @y n?? ya 2,370,103! Patented Feb. 20, 1945 ` UNITED STATES PATENT OFFICE INDICATING MEANS FOR PUMPS Norman .F. Zapf, Milton, Mass., assigner to Manning, Maxwell & Moore, Incorporated, New York, N. Y., a corporation of New Jersey Application July 15, 1943, Serial No. 494,797 12 Claims. . (Cl, 10S-1) indicating means of the present invention is here illustrated las housed within a casing 5 compris ing a hollow body portion 6 (which `may be a This invention ,pertains to indicating means and relates more particularly to means for indi cating whether or not a fluid driven pump is casting) having a removable bottom plate 6a, and effectively operating. While of more general utility the device is herein illustrated by way of example 'in its application to the feed ‘water sys a removable top plate or cover 'l secured in place by bolts 8. As illustrated, this cover 1 is pro-_ vided at its center with a screw-threaded open ing 9 which receives one end of a pipe I0 lead ing from the feed water delivery pipe 3 at a point between the oriñce 4 and `the boiler. tem of a locomotive boiler. Heretofore there has been no effective appa ratus available for >informing the locomotive en gineer or fireman whether, at any given instant, the boiler feed apparatus (pump or injector) is The lower part of the side wall of casing mem- n ber 6 is providedwith an internally screw-thread ed opening I'I which receives one end of a pipe I2 leading lfrom the water delivery _pipe 3 at a point purpose. However, it is desirable and in fact necessary that the operator be informed at once 15 between the pump and Athe oriñce 4. The hollow casing 5 deiines a large `chamber I3 in which is after he has performed the proper manipulations arranged a "pressure-responsive movable dia for starting the pump, whether, in response phragm device, here shown as a metallic bellows thereto, the pump is actually delivering >water in I4, one end of which is -`iixed leak-tight to ‘the suflicient volume. cover 'I 4so 'that the interior of this bellows is in The principal object of the present'l invention actually delivering water Íto the boiler, the usual water level gauge being wholly unreliable for this is to provide indicating apparatus operative 'to communication with -the `pipe I0. TheÍ opposite indicate `whether or not water at effective pres sure is being delivered by such a pump. A fur end-,of ’the ‘bellows is closed by `a rigid head I4a from the center of which projects a >bracket I5 carrying a pivot pin I6 which engages one end of a lever Il. This lever is fulcrumed at its oppo site end lon a pin I8 carried by a bracket I9 fixed to the wall of the casing member B; i -The casing member 6 is provided with an ex ther object is `to provide indicating means oper ative to show -whether vsteam is being supplied ‘to the pump. A further object `is to provide indi cating means of simple, reliable, and accurate type useful, wherever a fluid delivery pump is driven by pressure fluid, to indicate to the oper ator whether or not the pump is in effective oper ation. Other and further objects andradvan tages of the invention will be pointed out herein after in the following more detailed description and rby Areference to the accompanying ydrawing wherein Fig. 1 is a fragmentary, diagrammatic view illustrating portions of a boiler .feed system hav ing the indicating means of the present inven tion embodied therein; Fig. 2 is a side elevation of a casing .forming a part of the indicating means of the present in vention; rand , Fig. 3 is a `section substantially on the line 3--3 of Fig. 2. Referring to the drawing, the numeral I desig nates a steam supply Apipe leading from a boiler (not shown) to the boiler feed pump 2. This feed pump vmay be of rany .acceptable `type and is not here shown in detail. From this pump a water delivery pipe 3 extends to the boiler. At a point between the pump `and boiler this »pipe `is provided with an oriñce 4 so designed as to cause a substantial difference in pressure at 4its loppo ternal , boss 21D having a screw-’threaded socket 2| which receives one end of a vpipe 22 leading from the steam supply pipe I. The threaded bore 2| in the boss 2U communicates wit-h a chamber 23 within the thickness of the Wall vof the casing member 5, the lower part of this chamber 23 having mounted therein a re movable valve seat bushing 24 ‘having an axial passage Whose lower end is defined by an annular valve seat with which- cooperates a conical valve member »25, here shown as integral with the up per end of a vertically slidable valve stem 21 sur rounded by packing 28 held under lcompression by a gland 29. The -lower end of the valve stem 2l is pivotally »connected to the lever Il so that as the lever moves up and `clown the vvalve '.26 is moved 4.toward lor from its seat. The axial pas sage through the valve bushing 24 communicates (when the valve is unseated) with a chamber 29 below the bushing, said chamber communicating with a, screw-threaded bore 3B, in the boss 20, which receives one end of a pipe 3| leading to the locomotive cab lor other convenient point of ob servation where it terminates in a telltale pipe 32 (preferably downwardly directed) open to the atmosphere. site sides when water is flowing through the pipe. It will be noted that as thus constructed, the The controlling mechanism included in the 55 2 2,370,103 apparatus provides for exposure of the interior of the bellows I4 to the delivery pressure of the water in the pipe 3 at a point between the orifice 4 and the boiler, while at the same time the outer surface of the head member I Ila of the bellows is exposed to the delivery pressure of the water in the pipe 3 at a point between the pump and the pressure indicator responsive to compressed air and which would show visually or otherwise whenever air was being admitted to the gauge or its equivalent through the pipe 3l from the source of supply. While one desirable embodiment of the inven tion has been illustrated by way of example, it is to be understood that the invention is not nec oriñce, the latter pressure being somewhat high er, when the water is iiowing in full volume, than essarily limited to this precise embodiment, but is 10 to be regarded as broadly inclusive of any equiva the pressure between the orifice and the boiler. When the feed pump is not in operation the lent constructions falling within the scope of the lever I‘I tends to swing downwardly by gravity, appended claims. I claim: 1. In combination with a fluid delivering pump assisted by the resilient tendency of the bellows I4 to expand, but if the valve 26 is not thereby unseated the next subsequent admission of steam into chamber 23 will positively unseat the valve. 'When the feed pump is to be started the operator opens a valve (not shown) designed to admit. steam from the boiler to the steam supply pipe I. Assuming that the valve 26 isunseated at this time either by gravity or the steam pressure above it, steam from the steam supply pipe I immediately flows through the pipe 22 into the chamber 23, thence through the bore in valve bushing 24, and past the open valve into the chamber 29, and thence through the pipe 3l to the telltale 32 from which it escapes as a visible plum'e into the atmosphere, thus notifying the driven by pressure fluid delivered to it by a supply conduit, indicating means comprising a movable part whose position is determined by differential fluid pressures at spaced points in the pump de livery conduit, and a valve actuated by said movable part and operative to permit or to cut off the flow of pressure fluid from said pump supply conduit to a point of observation. 2. In combination with a steam driven water pump to which steam is furnished by a supply pipe, indicating means comprising a movable part whose position is determined by the pres~ sure of water in the pump delivery pipe, and a valve actuated by said movable part operative to operator that boiler steam has been admitted permit or to cut off the delivery of steam from to the supply pipe E. Until the pump starts and 30 said supply pipe -to a point of observation. becomes effective to deliver water in volume 3. In combination with a steam driven pump through the pipe 3 this ñow of steam outwardly to which steam is supplied by a conduit, indicat through the telltale continues. However, when ing means comprising a movable parts whose po the pump actually builds up effective delivery sition is determined by differential fluid pressures flow in the pipe 3 there results, by reason of the at spaced points in the pump delivery conduit, orifice 4, a differential pressure in the pipes I0 and and a valve actuated by said movable part opera I2, the parts being so designed and arranged tive to permit or to cut off the delivery of steam that when such differential pressure has been from said supply conduit to a point of observa established, the bellows head Illa will be forced tion. upwardly by the excess pressure in the chamber ° 4. In combination with a steam driven water I3, thus seating the valve 26 and cutting off pump to which steam is furnished by a supply communication between the pipes 22 and 3|. pipe, indicating means comprising an indicator The escape of steam through the telltale thus pipe open to the atmosphere at a point of obser immediately ceases, thus indicating to the op , vation, a movable part whose position is deter erator that the pump is in effective operation. mined by differential water pressures at spaced If the pump should stop or if anything should points in the pump delivery conduit, and a valve stop the flow of water through the pipe 3, the actuated by said movable part operative to per valve 26 is again unseated and the escape of mit or to cut off the delivery of steam from said steam through the telltale notiñes the operator supply pipe to the atmosphere through the in that something has gone wrong with the feed dicator pipe. apparatus. 5. In combination with a steam driven water When, after a suitable period of operation, the pump to which steam is furnished by a supply operator shuts on” steam from the pipe I, the pipe, indicator means comprising a telltale pipe pressure in the pipe 3 at opposite sides of the open to the atmosphere at a point of observation, oriñce 4 tends to become substantially equal, a movable diaphragm exposed at opposite sides since there is no longer an effective volume of to the pressures subsisting at spaced points re huid flowing through this pipe, and thus the spectively in the pump delivery pipe, and a valve lever Il is permitted to resume its normal posi actuated by said diaphragm and operative to de tion in which the valve 2S is unseated in readiness 60 termine the delivery of steam from said supply for a repetition of the cycle of operations. pipe into the atmosphere through the telltale While the device as above described is particu pipe. larly useful in connection with the feed water 6. In combination with a steam driven pump system of a locomotive boiler, it is obvious that having a steam supply pipe, indicating means it might equally well be applied to the feed water 65 including a telltale pipe open to the atmosphere system of any type of steam boiler. Likewise the at the point of observation, an oriñce in the pump apparatus may be applied to any system wherein delivery pipe, a movable diaphragm exposed at opposite sides respectively to the delivery pipe a pump driven by a pressure ñuid, is designed to deliver anothel` fluid through a delivery pipe pressures at opposite sides of the diaphragm, a against a back pressure. For example, the pump 70 valve controlling a passage leading from the might be a water pump for supplying a. reser steam supply pipe to the telltale pipe, and con voir and the pressure ñuid for operating the pump nections for transmitting motion from the dia might be compressed air, but in the latter event phragm to the valve, the diaphragm being oper it is obvious that the telltale device hereinabove ative so to position the valve as to admit steam referred to would be replaced by a gauge or other 75 to the telltale pipe from the steam supply pipe 3 2,370,103 whenever the pressure differential at opposite ting motion from the movable wall of said ex sides of the diaphragm falls below a predeter mined value. 4so constructed and arranged that the valve is pansible chamber to the valve, the parts being closed whenever a predetermined pressure dilîer ential is established at opposite sides of the ori flce. 9. In combination with a fluid driven pump having a delivery pipe and a pipe for supplying driving fluid for operating the pump, indicating posed to the ñuid pressure subsìsting at the de 10 means normally operative to reveal the presence of pump driving ñuid in the supply pipe, and livery side of the orifice in the pump ,delivery means responsive to the presence of iiuid under pipe and the exterior side oi' the bellows head pressure in the pump delivery pipe to terminate being exposed to the fluid pressure subsisting at the operation of the indicating means. the other side of the oriñce, a valve which con 10. A fluid actuated liquid pump having a de trols a passage leading from the steam supply livery pipe, a pipe for supplying driving'fluid to pipe to the telltale pipe, and connections for the pump, indicating means normally operative transmitting motion from the bellows head to the to reveal the presence of iiuid in said supply pipe, valve, the parts being so constructed and ar-> and means including a movable part Whose posi ranged that whenever steam is supplied to the pump it is admitted to the telltale pipe, but only 20 tion is determined by differential pressure at ’7. In combination with a steam driven pump having a steam supply pipe, indicating means in cluding a telltale pipe open to the atmosphere at the point of observation, an oriñce in the pump delivery pipe, a metallic bellows having a mov able head, the interior of the bellows being ex spaced points in the pump delivery pipe to pre until a predetermined pressure differential has vent operation of the indicating means while liq been built up between opposite sides of the ori uid is being delivered under pressure by the fice in the pump delivery pipe. pump. ,v 8. Indicating means for use in a system where 11. In combination with a steam driven boiler in fluid is delivered by a pump against a back 25 feed pump, a pipe for supplying steam to the pressure through a conduit and wherein the pump for driving the latter, a conduit leading pump is driven by pressure fluid supplied to it from the steam supply pipe to indicating means through a pipe from a pressure source, said in constructed and arranged to show the presence of dicating means including an oriñce in said con duit operative to establish a differential pressure 30 steam in said conduit, and means operative in re sponse to delivery of Water under pressure by the at its opposite sides, when ñuid is flowing in the pump to stop the admission of steam to said con conduit, a casing having therein a cavity which always communicates with the conduit at one side duit. ' 12. In combination with a steam driven boiler of the oriñce, the casing having therein an ex pansible chamber provided with a movable wall 35 feed pump, a pipe for supplying steam to the pump for driving the latter, a conduit leading which is externally exposed to the pressure in said chamber and whose interior is exposed to from the steam supply pipe and opening to the the pressure which subsists in the conduit at the opposite side of the orifice, means providing a passage leading from the pressure fluid supply pipe to a point of observation, a valve control ling said passage, and connections for transmit atmosphere at a point of observation, and means operative in response to the pressure of water delivered by the pump to stop the flow of steam through said conduit. NORMAN F. ZAPF.