US2490118A - Pump - Google Patents

Description

1949 R: H. DICKINSON 2,490,118

' I PUMP Filed July 19, 1946 2 Sheets-Sheet l H ""ml mml:

hull: n hllll ZI VVNT0R Dec. 1949 v R. H. DICKINSON 2,490,118

PUMP

Filed July 19, 1946 2 Sheets-Sheet 2 Patented Dec. 6, 1949 E S OFFICE BUMP Richard liarlandilfickinson, YOIH'WindsOr, land, assignor. to Hygroequipments' Limited,

London,., England," a"Brit ishcompany" n pneetiommmaiem, Serial No. csessa In Great Britain July 23, 1945.

Specific embodimentslof the present invention. willLnow. be described,.by way of. example, withreference tetheacconipanying drawing whereof- Eigurel is audiagrammatic. view of a deep-lift" pump. of... the single-acting; type constructed to embody features-oi thisinvention, and

Figure 2 is a similar'view to Figure 1 showing the inventionzappliedzyto, adoable-actingpump.

Referring to Figure 1; the pump comprises a driving unit generallyiindicated'by 'the reference numeral5. and a pump unit indicatedat 6. The

driving unit" is power -driven' and" is situated at,v say, ground level whilst the pump'unitis'located at the low level:from:swl'iich*.the liquidi'lis to be pumped.

Thedr'ivingunit 5 comprises asimple cylinder 8 andja piston 9 "whichis driven by any convenient prime'mover, for example through the agency of.

a crank-pin 1 ii andconnectingerodiI I l The pump unit6"'als'o comprises a cylinder 12' and piston l3 and tliecylinders of the pump unit and drivingunit are placed in communicationby a pairiof pipe-lines I4 and I5.- The-latter extend respectively one from each end of the cylinders 8 and I2 with which they are in permanent open communication. A third pipe-line I5 constituting the delivery pipe of the pump is also provided from the pump unit 6 to the high level at which the liquid is to be delivered. The pipe-lines I4, I5 and I6 constitute the only structural connection between the upper driving unit 5 and the lower pump unit 6, drive from the former to the latter being transmitted hydraulically so that no mechanical moving parts extending over the whole depth of the lift are required.

The piston I3 of the pump unit 6 has formed integrally with it a pump plunger I! which is adapted for reciprocation in a pump barrel I8. The latter communicates with the delivery pipeline I6, suitable non-return valves I9, 20 being respectively provided at the suction and delivery ports 2 I, 22.

It will be noted from Figure 1 that the pump plunger I1 is made of smaller diameter than the piston I3 and that it reciprocates in the pump barrel I8 which constitutes an extension of the cylinder I2. The pump plunger I1 and barrel I8 form a single-acting pump.

l'r'rthe operation'ofi'tlie unit shown'in Figure 1,

thel'two pipe-lines MI I5 are filledwith water or otherconvenient'liquidjand the two cylinders 8 3 andl2'are also filled; Assuming thatthe respective pistonsfiand l3f'areat the upper ends of' their strokes, downward movement of the driving. piston 8 by the crank mechanism Iii; II operates through the column of Twater in pipe-line I E to forcepiston ifidownwards in cylinder I2. During this movement, the water in the cylinder I21 and. beneath piston; I33v is. displaced.. upwards. through the pipeeline. I5l'and1fillthe upperpart of -cylinder 8 as piston iii-descends. On the return stroke ofthe piston 9. tliemotion of the. water in the two pipeelines is. reversedLand adrive is im parted lto the. pistonJSintheopposite direction.

The piston. I3thereby reciprocates the pump-- plunger I givingalternate. suctionandidelivery,

strokes thereto.

It :may be found .desirableto. be able to adjust the effectlve volumeiof thecpipe-lines l4, Iilin order to adj ust thereffective. length of I the con- To thisnectionv between. the two pistons 9, I 3. end means as shown in Figure 1 may-beprovided: the means comprises extension-pipes 23,2 i communicating respectively with the upper and lowerends of thecylinder-Band pIungerS: 25; 26 carriedone-within each extension pipe, the position of: the plungersbeing.adjustable by means-of thescrewed'spindles 27,128s If,;for example when:

the piston 9 is at one end of its stroke, and the piston I3 has not reached the corresponding end of its stroke, the adjustment is effected by screwing in the adjusting plunger 25 or 26 of the pipeline Hi or I5 which will force the piston I3 into a position corresponding to that of the piston 9.

If desired, an air cushion may be provided in each of the extensions 23, 24 of the pipe-lines I4, I5 to prevent hammer blow, and also safety reliefvalves may be provided on the pipe-lines to prevent damage to them in the event of some obstruction preventing movement of the pumpplunger I'I.

It is not necessary that the pump should be of the single-acting type as described with reference to Figure l, and in a modified construction shown in Figure 2 the pump-unit 6 is constituted by a cylinder I2 in which a piston I3 is reciprocated, with extensions 29, 30 at either end of the cylinder. One of these extensions (29) receives a plunger 3|, carried by the piston I3 and communicates with the hydraulic pipe-line I4 so that the pressure transmitted from the driving piston 9 operates on this plunger to move it in one direction. The annular space 32 around this plunger 3 constitutes one chamber of the pump, and an extension I! on the piston l3 operating in a bore I8 of smaller size than the cylinder 12 constitutes the other chamber of the pump. The pipe-line I5 is connected to the cylinder [2 as shown; the pump-plunger is therefore operated in one direction by pressure acting on the plunger 3| and in the other direction by pressure acting on the annular space surrounding the extension I! and acting on the lower face of piston l3. The two pump spaces 18 and 32 communicate through non-return valves 20 and 33 respectively with a single delivery pipe l6 up to the higher level and the pump space 32 connects with a suction pipe 34 which extends into the liquid 7 to be raised.

It will be seen from the above description that the only connection between the driving unit 5 at the upper level and the pump unit -6 at the lower level is constituted by three pipes, two of which (I 4, I 5) are filled with liquid for transmitting a drive hydraulically from the upper unit to the lower unit, and the third of which (I6) is the delivery pipe. These pipes may be arranged side-by-side in a suitable bore hole, or they may be nested one within the other as concentric pipes, or two of them may be located inside the third, such arrangements being useful when the diameter of the bore hole or the like is limited.

It will further be appreciated that since the two pipe-lines I4, are both filled with liquid, and are of the same length, the pressure due to the static head of liquid on the two sides of the piston of the pump unit 6 is balanced, and there is no tendency for the working fluid to leak in either direction around said piston; also if these pipe-lines are filled with the liquid which is being pumped, any small leakage which may occur as between the pump chamber (l8 or 18 and 32) and the cylinder I2 is immaterial, but such leakage is not likely to occur since on the delivery stroke of the pump the pressures are substantiall balanced in the two chambers when the open end Of the delivery pipe is at about the same level as the driving unit.

In another embodiment of the invention the driving unit comprises a pair of piston and cylinder assemblies, the pistons being reciprocated as described and in synchronism whilst one driving cylinder is connected to one end of the cylinder of the pump unit and the other driving cylinder 4 is connected to the other end of the pump-unit cylinder. In each of the embodiments described the piston of the pump unit may be moved in one direction hydraulically by the driving unit and be moved in the opposite direction by spring means acting on said piston.

It will be seen that this invention provides a very simple form of pump in which the number of moving parts is reduced to a minimum, and which is easily installed in a shaft, or in a bore hole since no moving parts extend from the operating motor at the top to the pump-plunger at the bottom.

Iclaim:

1. A deep lift pump comprising a first cylinder and piston contained therein, a pair of oppositely dis-posed coaxial plungers directly connected to the piston and contained in cylindrical extensions of the cylinder, a second piston and cylinder device, a pair of pipe line connecting one end of said second cylinder to one end of said first cylinder and the other end of said second cylinder to the cylindrical extension at the other end of said first cylinder, and means to vary the effective volume of each of the pipe lines for adjusting the mean position of the first piston.

2. A deep lift pump as claimed in claim 1. wherein the means to vary the effective volume of each of the pipe lines comprises, for each pipe line, a container in open communication therewith, a plunger carried within the container and means for adjusting the position Of said plunger within the container to vary its volume.

RICHARD HARLAND DICKINSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 251,593 Jamies-on Dec. 27, 1881 1,304,411 Tobin May 20, 1919 2,127,168 Grant Aug. 16, 1938 2,162,748 Richards et a1 June 20, 1939 FOREIGN PATENTS Number Country Date 555,357 Germany 1932

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