Pump system

Abstract

Claims

.Fan. 15 9 1924. 1,481,199 I o. HAENTJENS PUMP SYSTEM Filed March e, 1925- "mQNToR '7'0 HHE NTJEN5 BY ATTORNEYS Patented alam 15, 1924. OTTO TJ'ENS, F IHA ZLETON, PENNSYLVANIA. rum? srs'rm. Application filed Hatch 6, 1923. Serial No. 623,211. To all whom it may cbncem: Be itfknown that I, Orro HAnNTJnNs, a citizen of the German Republic, residing at Hazleton, in the county of Luzerne and State of Pennsylvania, haveinvented certain new and useful Improvements 1n Pump Systems, of which the following is a spec1- fication. -Myinvention relates to pump ,1 systems, and particularly to pump systems of the general type illustrated in. my copendlng application Ser. No. 532,784, filed January 30, 1922, upon which Patent No; 1,445,507, K dated February 13, 1923, has been granted me for the priming of centrifugal pumps. The object of my present: invention-1s. to provide an "improved .check, valve arrangement in the priming connection between the Centrifugal pump and the priming pump, and particularly to provide .a valve which is positively opened during the drive of the priming pump, but is closed by the pressure of the discharge from the centrifugal pump when the latter is started during thetempo rarily continued run of the pruning pump. In the accompanying drawmgs Fig. 1 is a vertical section through a check valve and associated parts, the valve being shown mounted directly on the casing of a centrifugal pump, while the amociated pruning pump and its motor are merely diagrammatically shown; Figs. 2 and 3 are respectively sections on the lines 52-2 and 3-3, Fig. 1. In a system of the present type, the cen trifugal pump 5 is primed by an auxiliary pump P such s illustrated in my copending application Ser. No. 532,783, filed January 30, 1922. The present valve isarranged 1n the priming suction lme S, and preferably adjacent the centr fugal pump and serves to prevent delivery to the priming line atter the centrifugal pump is in full operation. As here shown, the valve casing 6 is mounted directly on the casing of the centrifugal pump 5 and has apassage 7 registering on the one hand with thepriming port 8 in the pump casing, and on the other hand with the chamber 9 to one side of the check va1ve 10. On the opposite side of the latter, the chamber 9 has a port 11 which opens to the suction chamber 12 to which the suction line S to the priming pump P is connected. v The stem 13 of the valve passes through port 11 and guide boss 14 on the valve cas- -veniently supported upon a bracket arm 19 in extension of the valve casing. The packmg of the guide boss 14 is obviated by a washer 20 arranged on the valve stem and pressed bythe yoke head 15 against a seat in the outer face of the boss 14; in the open position of the valve. 10, thusseal' the guide passage through the boss 14 and preyenting air leakage at thispoint while the priming pump is in operation. The valve 10 is cupped and provided with a peripheral bearing fiange 2l which makes seal with the wall of the valve chamber 9. Ports 22 preferably opened-through the side wallof t e valve (or through the bearing flange 21) establish communication between opposite ends of the chamber 9through the seat 24 in the diaphragm25 through which; the port 11 is opened, and thus seals this port against flow to the priming pump when: the centrifugal 5 is in operation. The combined cross-sectibnal area of the ports 22 in the valve is less than the unobstructed cross-sectional area of the port 11 in diaphragm 25 fora reason that will he hereinafter pointed out. While the solenoid winding 18 may be energized from any suitable source, I prefer to arrange it in series with the motor -M which drives the priming pump P so that while the latter is in operation the solenoid tends constantly to hold the valve open. The pull of the solenoid winding upon the core 17 is in the direction of the arrow X. The operation of the valve is readily understood. Assuming the solenoid 18 to be energized, for example by closin the circuit of the priming pump motor the valve is shifted to the open position illustrated, and the suction of the priming pump exhausts the centrifugal pump 5 through port 8, passage 7, chamber 9, valve ports 22, diaphragm port 11, suction chamber 12 and suction line S. By reason of the suction eifort exerted by the pump, and thegreater area of the port 11 than the valve ports 22, there is greater depression on the suction line side of the valve than on the side toward the centrifugal pump 5, and as a consequence the valve tends to close. The solenoid 18 is sufficiently powerful, however, to prevent this. When the centrifugal pump has been fully primed and has been set in motion, it delivers not only through its discharge outlet (not shown) but also throu h the port 8 to the the valve chamber 9. y reason of the restricted area of the ports 22 in the valve, which permit less flow therethrough than the port 11 can readily accommodate, pressure is built up on the centrifugal pump side of the valve 10 and, overcoming the opposition of the solenoid 18 forces the valve to its closed position in which the washer 23 seats against the diaphragm 25 and seals the port 11. Further delivery by the centrifugal pump to the priming suction line S is thus cut 03 and remains cut off until the centrifugal pump requires repriming and the priming pump is again set in motion. It will be understood that the priming pump is maintained in operation only until the centrifugal pump is fully under way and working properly, whereupon the priming pump is halted during the run of the centrifugal pump. It is desirable from a practical standpoint, however, that the priming pump be kept in operation during the initial drive of the centrifugal pumpi. e., until it picks up full speed. As matters of structural convenience afforded by the present invention, attention may be called to the fact that the valve chamber 9 is closed by the detachable cap 26, so that the valve may be readily removed for inspection and repair after it has been unscrewed from the solenoid head :15. Again, a plug 27 may be arranged in the valve casing opposite the passage 7 and port 8 so that a clean-out tool may be inserted therethrough to remove any obstruction which may have lodged therein during the operation of the centrifugal. The construction is simple and efiicient. The connection of the solenoid winding in series with the priming pump motor, ren ders the opening of the valve positive at the moment when the suction connection must be established, while there is no effort to open the valve or to lessen its effective seal during the operation of the centrifugal pump, as would be the case were the valve stressed toward open position by springs. Various modifications of construction will readily occur to those dealing with the problem which do not depart from what I claim as my invention. I claim 1. In a priming system for centrifugal pumps, a suction line connected to the pump casing, a check valve arranged in the suction line, and electromagnetic means for holding said valve open.v during the priming operation. 2. In a priming system for centrifugal pumps, a suction line connected to the pump casing, a check valve arranged in the suction line, and electromagnetic means for holding said valve open during the priming operation, said check valvebeing adapted for closure by the delivery from the centrifugal pum'p when the latter is in operation. 3. In a priming system for centrifugal pumps, a suction line connected to the pump casing, a check valve arranged in the suction line and ported to permit suction effort 'to be exerted therethrough, the ports in the valve having a total cross-sectional area less than the cross-sectional area of the passage on the suction line side of the valve. 4. In a priming system for centrifugal pumps, a suction line connected to the pump casing, a check valve arranged in the suction line and ported to permit suction effort to be exerted therethrough, the ports in the valve having a total cross-sectional area less than the cross-sectional area of the passage on the suction line side of the valve, and means for maintaining said valve open despite the pressure drop on the suction line side of the valve. 5. In a priming system for centrifugal pumps, a suction line connected to the pump casing, a check valve arranged in the suction line and ported to permit suction effort to be exerted therethrough, the ports in the valve having a total cross-sectional area less than the cross-sectional area of the passage. on the suction. line sideof the valve, and means for yieldably maintaining said valve open despite the pressure drop on the suction line side of the valve. 6. In a priming system for centrifuga pumps, a suction line connected to the pump casing, a check valve casing arranged in the suction line, a piston check valve arranged within'the casing and having passage means therethrough to permit communication between opposite sides of the valve, and means for yieldingly holding said valve in open position against the effort exerted in the suction line. 7. In a priming pump system, an electric motor-driven priming pump, a suction line connected thereto, in combination with a check valve arranged in the suction line, and electromagnetic means energized during the drive of the pump motor for stressing said valve to open position. 8. In a priming pump system, an electric motor-driven priming pump, a centrifugal pump, a suction priming line between said pumps, a check valve arranged in said line and means operative during the drive 0 said motor to stress said valve to open position, but yieldable to permit the valve to close under the pressure of the delivery from the centrifugal pump. 9. In a priming system for centrifugal pumps, a suction line connected to the pump casing, a check valve casing arranged in the suction line and having a valve Chamber, a suction chamber communicating therewith through a port, a check valve controlling said port, a stem on said check valve passing through the suction chamber and valve casing and guided by the latter, together with sealing means associated with the valve stem and arranged exterior to the casing, together with means for simultaneously a suction chamber communicating therewith through a ort, a check valve arranged in the valvec amber and having a stem passing through saidport and suction chamber and casing to the exterior of the latter, to- gether with a washer on the stem side of said valve adapted to seal the said port in closed-valve'position. v 11. In a priming system for centrifugal pumps, a. suction line connected to the pump casing, a check valve casing arranged in the suction line and having a'valve chamber, a suction chamber communicating therewith through a port, a check valve arranged in the valve chamber and having a stem passing through said port and suction chamber and casing to the exterior of the latter, a Washer on the stem side of said valveadapted to seal the said port in closed-valve position, a washer mounted on the valve stem exterior to the casing, together with means for simultaneously moving the valve to port opening position, and for pressing the washer on the valve stem against the exterior of 'the c-asin to seal the latter against leakage at the va ve stem-passage-way therethrough during the priming operation. In testimony whereof I have signed my name tothis specification. OTTO HA-ENTJ ENS.

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    US-2433085-ADecember 23, 1947Continental Aviat & EngineerinOil pressure valve structure and vent