US2275627A - Pumping system - Google Patents

Description

Marc-h l0, 1942. M. W. HARTMANN PUMPING SYSTEM Filed April y3, '1939 INVENmR.

ATmRNEY.

` water where required.

Patented Mar. 10, 1942 UNITED STATES j PATENT OFFICE PUMPIN G SYSTEM Milford W. Hartmann, Hutchinson, Kans. Application April 3, 1939, Serial No. 265,679

3 Claims. (Cl. 103-5') This invention relates to pumps, and in particular to a pumping system including a centrifugal pump in which great exibility of pumping characteristics is attained;

An object of my invention is to provide a Water supply pressure system including a centrifugal liquid at low pressure and pressure. Still another object is to provide an ejector with a check-valved by-pass. Another object is to provide a check valve of improved structure.

These and other ention, which will be best understood by refwater pressure Fig. 3 is an check valve;

Fig. 4 is a cross-sectional view taken on the line 4-4 of Fig. 3;

Fig. 5 is another cross-sectional view as in Fig. 4 with the annular valve ring removed;

Fig. 6 is an enlarged vertical section of the foot valve of my system.

Referring to the drawing, the centrifugal type pump II operatively connected to a motor I 2, draws water through suction pipe I3 from a Well I4, and through discharge pipe I5 delivers water enlarged view of my improved nected to the discharge pipe I5 by pipe I 8 and electrically to the motor I2 by conduit encased wires I9, this device functioning to automatically stop the motor I2 when the pressure in the tank I6 has reached a predetermined maximum, and to start the motor again when the pressure is below a chosen minimum. The discharge pipe I5 is also the delivery pipe from the tank, a water outlet pipe 49 with valve 50 delivering the The ejector device 2l is attached in the wen tc the suction pipe I3, and below the ejector device 2|, the foot valve 22 is connected by the pipe 5I. 'Ilie ejector device 2| is also connected to i the pressure or discharge pipe I 5 from the pump,

- by the recirculating pipe 23, having a control valve 24. Within the ejector device 2| an upwardly pointed nozzle 25 is supported within the nozzle housing 26 by the side-entering tube 2l which connects with the recirculating pipe 23. Above the nozzle 25 is an eductor tube 28 supported within the eductor housing 36 by the hub or partition 29 having ports 30 for the passage of liquid through the partition. The partition l 29 is held by the collar 35 at the threaded connection between the valve body or ring 3I is free to length of nozzle housing 26 and the eductor housing 36. The ports 30 are controlled by the annular valve body 3I, which when the valve is closed, rests on inner conical seat 32 and outer inverted conical seat 33. The annular K move in the space between the seats 32 and 33 and the stops 34, which are attached to the eductor tube 2B at a point sufficiently above the valve seats so that the valve ring 3l when lifted by the ow of water will give an unobstructed passage through the ports 3|).`

The eductor tube 28 is shaped tube having a short 31 at the preferably a conecylindrical portion small end adjacent the nozzle 25. The this cylindrical portion is about six times its inside diameter. The conical portion tapers down to that of the pipe I3.

The footvalve or check valve 22 in the well is similar in construction to the ring valve in the ejector device, the stops 34a being attached to a threaded stud 39 in the hub orpartition 29, which is threaded into the footvalve casing 40, which in turn has a threaded upper end for atseats32 and 33. The valve conical, the outer one 33 being an inverted cone,

Yejector is present, the pump pump' alone (without 2, together with the details shown in Figs. 1, 3,

4, and 6. In using such a system for household service, it is desirable to have a water supply available at all` times at pressures of 35 to 70 pounds per square inch, the amount of Water to be delivered at these household pressures inv a given time being relatively small. Such pressures are not practicable when using a centrif-f i.

ugal pump without the aid of an ejector. For other purposes, such as irrigation otgardensand lawns, a large volume of Waterf-at lowfrpressuremay be desired from the same system.' When, however, an ejector of the usual type, (without myy valving arrangement) is placed on the suc.- tion side of the pump,jthe` volumeL capacity'is` therebygreatly reduced, because the water must all Ago through the jet and 'ed'uot'or tube, which are.necessarily constricted.

While another suction pipeline, with hand 'operated ,valves might" be used to bj1-pass. the ej ector, and permit the centrifugal pump to deliver a large volume of water at low pressure, this arrangement is impractical, and its obvious drawbacks are avoided by the us'eof my valvedejector device. Y l

When the pump is operating againsta pressure such as that'of the closed system represented in Fig. 2, the ejectoractionof the recirculated Waterv through the tube 23` and the operi 'valve 24, through nozzle 25 and the eductor tube,28',` is to put into the tank I6 arelatively smallvclume ofwater at a, high pressure, a p art of the water or course being recirculated. 'While so operating against pressure, there isa, higher pressure in theV Water above the ring valve thanin the water froml the well immediately surroundingthe nozzle 2 5', and consequently the ring valveA 31' remains tightly closed on the seats `iland, 33, andr no water passes through the valvedports 3U.

If, now, thevalve 50 beopened and water flows from the system, the pressureimmediately drops, andif thefrate of 4dischargeof waterfrom the system is rapid, there is no opportunitytotbuild up :pressureA in the ,tank again. The delivery pressureis low, andthe eductor exerts little effection the pressure in the system. The pump, delivering a vhigher ,volume of water. at theI lower delivery pressure, reduces `the pressureabove the ring"valve, which then sucksl open, fand ,permits thexpu-mp to function substantiallyas, if'there were no ejector in the suction line. If 'the valve 24 is closed so that no water recirculat'es through theu ejector, the action is the samev aswhen no y II simply sucking` the iwater from the well through the footvalve 22, the pipe 5|; the ports land around the eductor tube 28 through the housings 36 and 31.

Under` the conditions ofbuilding up pressure inthe system, the action would be Vas follows: the valve 24'being opened and the'valve 50 closed with the system at low pressure, the pumpY Il would draw water through the ports Biljand ,al'so through the eductor tube 28, and asmall amount of water would recirculate through the pipe 23 and the nozzle v25. Thepressure would be built upto the maximum available forthecentrifugal' an ejector). The. water recirculated; through thenozzle' would attainv av4 higher and higher velocity as the pressure built up in the system and in line 23, and would become an added factor in increasing the water pressure until it counteracts the suction in the housing 36 above the ring valve 3 l and this valve closes automatically, so that all of the water passes through the eductor tube, the pressure continuing to build up as the proportion of recirculated Water through the nozzle 25 becomes greater and greater. When thepressure in the system has builtfup to .the desiredmaximum, the automatic pressure Ycontrolled switch I1 stops the motor.

In place of the handV operated valve 24 shown inethe recirculating pipe line 23, I may use an automatic pressure actuated valve which will fully open when the water in the discharge line Aof theepump. reaches the pressure at which the efficiency of the centrifugal pump is becoming seriuslyv decreased. The opening of this valve automatically will start the action of theejector device` and increasethe pressuren as4 above' described.

While I have describedapreferredform ofmy invention, I do not wish. tobelimited thereby, but restrict'my invention onlyl insofar. asrequired bythe prior. art andthe spirit of thel appended claims.` l

I claim:

1. In a, pumping, systema.centrifugal pump, a. suction pipe `connected 'to. sad.pump, a footvalve at vthe lower end of said 4suction pipe, ,and anl ejector device insaid suction pipe, intermediate Vthe pumpV andthe foot-valve, said ejector device comprising-,a housingphaving a recirculation pipe from the recirculation pipe, apartition wall. in saidlhous.-

short, cylindrical` section .and a., longer conical.

, section in which the connecting means Y in,

projectedwallangle is .about eleven degrees, the endof uthe cylindrical sectionl extending through and supported by saidpartition,A checkfvalvedports through said partition, said housing above the eductor.' tube for said suction .pipe .communicating with'thesuction side ofthepumpy and connecting meansin saidjhousing beloivsaidtnozzle for said suction pipe leading down tosaid footvalve beneath the liquid in aA reservoir.

2; In a pumping system, a centrifugalpunfipgt a suction pipe connectedv to said pump, a footvalve at the lower end of said. suction pipe,qand; an` ejector device in. saidsuctionppe interme-y diate the1pump,` andthefoot-valve, saidl ejector device comprisinga housinghaving arecirculation pipe from the discharge ofsaid pump.` con.`

nected in one side thereof, ran up-Wardlydirected n ozzleattachedfWithinthe housing, to said re circulation pipe.a,p.artition wall insaid housing abovesaidnozzle, an eductorftube having arshort cylindrical section'and a longer conical section in which the projectedwall angle. is about eleven degrees, they end-ofthe cylindrical, section extending, -through, andV supported -by said parti tionpor ts.in saidpartition-arranged in a circle around said j. eductor tube, a ring-shaped valve seat Von the',V upper side of saidnpartition communicating-with saidports, a --rubber-like ring adaptedtocoact with saidseat toY serveas'a valve;

connecting means in said housing above the educ'- torftube for said l'suction pipecommunicating with the suction side of the pump,. and connecting ,means Ain said housing. below isaid nozzle. `for dischargeof said. pump connected in the one side thereof, an upvvardlyldi-` rected nozzle attached withinthefhousing to said` said suction pipe leading down to said foot-valve beneath the liquid in a reservoir.

3. In a pumping system, a centrifugal pump, a suction pipe connected to said pump, a footvalve at the lower end of said suction pipe, and an ejector device in said suction pipe intermediate the pump and the foot-valve, said ejector comprising a nozzle housing having a side entering tube, a recirculation pipe connected to the discharge of said pump, said side-entering 10 tube on `the inside being turned upwardly and adapted to engage a nozzle, a nozzle attached to said tube, connecting means in said housing below said side tube for said suction pipe leading down to the foot-valve in a well, a partition wall 15 disposed above said nozzle, a tubular opening through said partition wall centered with said nozzle and provided with a wide-angled conical port directly above said nozzle, an eductor tube attached in said opening concentrically with said conical port and said nozzle, an eductor housing attached above said partition to said nozzle housing and having connecting means to said suction pipe above the larger end of said eductor tube leading to the suction side of the pump, said eductor tube having a short cylindrical portion immediately above said nozzle and a long conical portion of about eleven degrees cone angle, said partition also being provided with through ports arranged in a circle around said eductor tube, a ring-shaped valve seat on the upper side of said partition at the ends of said ports, a rubberlike ring adapted to coact with said seat at times -to close said ports, and stop means to limit the upward movement of said ring.

MILFORD W. HARTMANN.

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