Патент USA US2112575код для вставки
March 29, 1938'. ~ " A. H. RICHARD 2,112,575 FLOW STABILIZING DEVICE Filed NOV. 11, 1936 INVENTOR AllenHRichamZ “m ' H l S ATTORNEY. Patented Mar. 29, 1938 'um'rrn STATES 2,112,515 now srsnmzme pnvrcn suenir. Richard, manta-1y. N. J.. assignor to Ingersoli-Rand Company, Jersey (City; N. 1., a - corporation of New Jersey I > , ‘Application November 11, 1936, Serial 1:... 110,213' _ '2 Claims. (Cl. 103-97) This invention relates to pumps, and more The ?gure in the drawing accompanying this particularly to a ilow stabilizer for centrifugal s eci?cation is a longitudinal vertical view, part . pumps operating to-maintain a hydraulic pres; sure in the line or element into which it dis 5 - charges. ._ ly'broken away, of a pumping system equipped . with a ?ow stabilizer constructed and arranged ' In pumping systems of this character,‘ the pump-frequently continues to run at-i'ull speed and during certain periods of its operation only a suiilcient amount of water is discharged to pre 10_ vent excessive temperature rise of the water in accordance with thepractice oi’ the invention. 5 ' Referring more particularly to the drawing, 20 ' designates a centrifugal pump, and 2| and 22 its - inlet and discharge conduits,respectively. The pump 2071s shown as‘ being of the. multi-stage type having an'initial stage’ impeller 23 and a 10 within the pump. Obviously, when operating ' iinal stage impeller 24 which are mounted upon under these conditions the pressure generatedby a shaft 25 journalled in bearings 28. ' The shaft the pump impellers is higher than that generated is suitably connected to the shaft 2‘l‘of a motor 28 whereby the rotary vparts of the pump are when supplying maximum demand, and if, then 15 the discharge side of the pump is relieved, as by ’driveno I opening a valve or valves, a severe pressure drop ~- Only fragmentary portions of the inlet and dis 15 may occur'at the inlet end of the pump. This _ charge conduits are shown, for convenience of I is due to the inability of the water in the inlet illustration, and it is to be understood that the conduit to accelerate its velocity quickly enough‘ discharge conduit 22 may form a part of a hy draulic system from which the passage‘of liquid 20 20 to maintain the various pump passages filled. With the valves closed the waterqin motion within the pump is already at a velocity in excess of normal and does not require acceleration ‘while the liquid on the‘ suction side is far below‘ 25 its normal velocity and must, therefore, be ac-_ celerated when the discharge valve opens. Oth erwise, the unbalanced pressures to ‘which‘the rotativeparts of the pump become subjected will cause vibration and frequently serious damage to 7 30 the pump rotor‘ and the casing-J; ' A further undesirable and frequently harmful eifect ?owing from this condition of intermit tently arrested velocity of the liquid on the inlet side of the pump and the consequent unbalanced _.35 pressures resulting when the discharge line is 1 opened is that when the liquid in the, inlet'con duitbeginsto.moveitsvelocityissofarinex-. cess of normalnthat upon its entrance into the regionoi suhnormsl pressure asevere is 40‘ impartedtotherotsting parts'andtothepump F - ‘may "be controlled'by suitable valv , so that, in eifect, the pump may be said to discharge into a closedsystem.‘ The discharge conduit 22. is, however, provided with an oriiice 29 that con- ~ stantly discharges a sumcient amount of liquid to assure circulation of liquid through the pump at all times, and thus prevent undue heating of the liquid within the pump during periods when ‘no liquid is being discharged for its intended pur In accordance with the practice of the inven- 30 tion, means are provided for assuring a readilyv available supply of liquid and its prompt intro duction‘or delivery to the inlet side of the pump _ whenever-1 the pressures within the passages'in 35 the pump and the impellers tend toward an un balanced condition. "The means selected for il lustrative purposes comprises a closed tank It which is interposed in the inlet conduit 2|. The tank 32 is arranged closely adjacent'the inlet 40 side ofthepumpsothatonlyaminimumlength‘ Itissccordinglyanobiectofthepresentin 'or section of conduit II is required :to a?ord - vention to prevent the occurrence of subnormal _' communication betweenv theinterior of the tank pressuresinthevarious pump passages and con-" and the inlet chamber ii of the pump. The sec ' 45 sequently to avoid subiecting'the' pump parts to tions of the conduit II are preferably connected 4!; undue strains and also to avoid the occurrence vclosely adjacent the lowermost portion 01' the of a condition within the pump that may induce . tank-2Q and all the. liquid supplied ‘to the pump ' ‘ severe and harmful vibratory movement of the pump :rotor. _ ' - ' ' _ 50 . Another object is to assure .an immediately available supply of liquid sdjacentthe inlet side , of the pump suihcient to maintain the pump pas sages constantly ?lled with liquid. I -' e Other objects will‘ he in, part obvious and in as part pointed out passes through the interior 22 of the tank which - constitutes a storage chamber for liquid. The tank “is of such capacity as to contain 50 an amount of. liquid sumcient, or in excess of that required, ‘to maintain the pump es thor- N oushly‘?lled upon the occurrence of a sudden‘ demand upon the discharge sideruntil the velocity oi'theliqiudintheinietconduit?mayreschgg 9,119,011; .52mer'ste at which it nor-mam‘ ?ows when mans and ?uid M‘, from the chamber is through the port 81 into the upper portion oi’ the passes from ;the discharge line for it's intended Dim To the end that the liquid in the storage cham chamber Ifthenthepressureinthedischarge conduitis suddenly reduced the liquid in the ‘storage cham ber s: mayhesuppliedtothepumpundernormal ber "immediately ?ows into the passages of the pump under pressure d maintains said passages pressure, even though the velocity of the liquid in‘ the conduit “leading to the storage chamber. adequately iilled. By suitably proportioning the is below normal, the storage chamber is provided storage chamber 82 a sumcient supply or liquid with! suitable valve mechaniam_ designated. in : may be delivered from the storage chamber to tleig generaLTby SI, adapted to, admit gaseous ?uid pump through the brie! period of time requi r under pressure into the upper portion of the stor age reservoir. which is. unvented. and above the level of the liquid within the storage reservoir. by the liquid in the portion of the inlet conduit ll leading from the supply to gain its normal ve locity., v The valve mechanism It comprises a-casing as having a chamber ll into which is introduced 15 pressure fluid by a conduit 30 which may lead from a suitable source of 10 . 15 I claim: . v . i. In a ?ow stabilizing device, the combination ct a centrifugal pump and an inlet ‘conduit there- -' , ?uid M11. ior, a tank in the inlet line adjacent the inlet Inthewaliodthechamber llisaportl'l which opening of the pump iorming a storage chamber is controlled by‘ a needle vaive?slidahleinthe .casing 84. The needle valve SI is actuated to the open position byua ?oat ll having an arm II which is pivoted at its iree end to thecasing I‘ a pin 43 carried by 'andhasaslotlltorec vsarm II is preierahly the needle valve 38. The of L-shape and on the depending portion thereoi ' is mounted the ?oat member '0. . a tor-"liquid and having an unvented upper portion, ‘and means operating in response to a predeter mined maximum level of the liquid in the storage chamber for introducing gaseous ?uid under pres sure into the. storage chamber to accelerate the now oi liquid irom the storage chamber into the 2. In a hydraulic system, the combination of The operation of the pump is as follows: ‘Let it ‘.inletand, discharge conduits and a pump inter be assumed that all the valves or outlets on the posed between the conduits and operating to discharge side 0! the pump. other than the orifice maintain liquid under pressure in.the discharge is‘, are closed. Under this conditionot operation conduit, means interposed in the inlet conduit the pressure .within the'discharge conduit II is. oi’ ' adjacent the pump iorming a storage chamber for course, the same or higher than when the pump liquid, and means in the storage chamber actu is discharging its full rated capacity and only an ' ated by a maximum level 0! liquid amount of liquid such as that which may pass in theistorags Lchamber for introducing gaseous ‘through the cruisers circulates through the pump into storage chamber to so that the velocity of the water in the: inlet con- '» accelerate the (low oil liquid from the storage -' duit ii is necessarily low. _ : - Let it further be assumed that. upon the initial ' > introduction oi liquid to the pump, the liquid rises p‘ in the storage reservoir "until it reaches the member». The needle valve v8! is’then opened‘ chamber into the pump upon the occurrence 0! a a sudden reductio oi pressure in the discharge con duit. - . ' ' ALLEN H. RICHARD.