US2048098A - Pump - Google Patents

Description

2 Sheets-Sheet 2 INVENTOR.

July 21, 1936. A. BoHNENBLusT PUMP Filed Aug. 9, 19:55

Patented July 21, 1936 ATENT orifice PUMPV Arnold Bohnenblust',V RileygKans'. Y animaron. Augusta 1933.-. Serienr. 684,375

aolaims. (or s-196) My invention relates to. pumpsani thelike and has; particular relation to. a. reciprocating type pump adaptedior producing; a; continuous;v fluid While pumps of; the above type.y are` one; or the oldest machines, in the mechanic.:V artsy Athere. has been little. progress-'ini the; art: irl-late.l years;` Sub: stantialiy the. same structures: are employed' as were; used;` years ago. 'Eheseistructures require l0 stung or packinggboxesforithe `pumplrods. and necessitate the use of atv least fourV valves: in ordery tosecure the comparatively continuel-inflow oi luidresulting from theuSeoi a double acting pump- 1v A general object` of. my invention is tolover. come the. diiculties above pointed.` out'andz to provide a reciprocating pump-whichV Willsecure a substantially constant iluid flow, which` will require a. substantially constant powerf input, and which will requirea minimumnumberfoftvalves andparts. Y Y Another object of my inventionistoi` provide a: reciprocating', double-acting pump` which; .uses onlytwoavalvesl fior securing continuous-now of the -uid'. Y

Another object of my invention is to provide ai pump of the above description oneof theZ cylinders may be located deep in a wellf and the otherlocatedneartheisurface of: the ground; Another object' oirl my" invention is toprovide Y a pump which does `not need stuffing-'boxes and the like for sealing the pump1 operating-plunger. Another' object ofmyv invention is toprovide means-- for oilingthe rotating andl reciprocating I partsY of a pumpof the aboveol'iarac-zter;

Y Another object oi-A my' invention is tol provide means for leading oi -uid which may' collect in certain parts of the pump. Another objec't of my inventionis 'to-provide means for injecting airor gas into' the fluid being pumped, if so desired. Y

Other and' further objects and features., 0i my invention will be more apparent tothose skilled in the art upon a. consideration of. the accom.-

panying drawingsv and following. 'speoiiication, wherein .isdisclosed an exemplary embodiment. of the inventiomwith the understanding however, that such.- Ghanges maybe made therein asf-.al1 5h withinthescope of the @sonoridad claims without departing; from the spirit off" thefinventionf...

' Inthefdrawings:VA

' Vlii'gure f L is a. view iniverticaliseotion `showing1 a pump-.structure constructed according:t'oione:ein:V bodiment of my invention. Y l Y Figure 2 is a view in perspective of-` the Vall/.e .and valve operating mechanism. shown in Fig.- ure- 1 which is. used forbleeding oft fluid which may collect in the interior o f the pump.Y

lgfigure7 3; is a view in vertical section of a, modif l5` lied form of pump constructed according to another embodiment o f my invention, and;`

Figure 4 is a view in horizontal.` section, taken alongthe line 4 4 of Eigu-.re 3. Only a. portion o f Vthe section is; shown asA the s ectionis substan.- l0' tially` symmetrical at this. lille.4

1n order to, better understand'. the invention, ref erencemay now be had to Figures 1 and 24 in which all the operating parts; or units; of the pump; are. incorporated into one compact, unit, l5- Aiter arr explanation of this structure:` hasheen given, a modified form of' the invention, shown. in Figure 3f, willy be explained, in which modified form one of the pumping units is located: atA an appreciable distance below the. other. 20 Referring now morev particularly to. Figures 1 and 4;thereis shown at I0, generally, a cylindricalicasting which serves as an enclosureon housing. forxmost. of the reciprocating parts of the pump. 'Ihe casting or lower housing lll` is com.- 25 prised of a disk-like base plate l-I andf an upstrucky cylindrical housing i2. The under side ofV thefportion; ll is hollowed out: as indicated` at ld for lightness and is provided with a4 channel lid leading from the edge' of the base: plate in- 30 wardly and up.l through the center thereof. A plugV |.6. at the central portion. of the base plate hasy threaded engagement therewith andV is thus removable therefrom.V for a purpose hereinafter described". 35

.The upstruck cylindrical portion l2 serves as a mounting on which a cup-.like tubular casing or upper housing Ilf may be mounted. The upper housing l1 is held. on the. lower housingbymeans of lo'oltsA |^8iwhich passl through the bottompor- 40 t-ion-` I9; ofi the housing L1 and areA threaded into the base plate H. Y l A cap 2li rests on top of the. housing |1- and: is provided with adepending flange 22'; at its outer edgeitozextend: down over the outerI wall of. the 45 casing H. Thecap serves as a covering for the housing Vi to prevent dirt and! foreign material from. entering the' housing. It need. not befastened* t@ the housing.

The inner wall of the.' housing l1" isl provided 50 with:l a ofl oppositely-disposed, verticallyextendingribsA 23' andi these rilos are provided with'- longitudinal bores as indicated: at: 24. A dependingzcircular'ange 2,6 ont` the lowerssiderof the\.wal1 laof; housing. .I l.: is;` internally threaded 55 in order that the flange may act as a support for a small cylinder 2.1, the upper edge of which is threaded into the ange 26. A channel, as indicated at 28, extends upwardly from the chamber 44, formed by the cylinder 21, into the bottom wall i9 of housing Il' and out horizontally as indicated'at 3| in order that fluid may passr from the chamberY 44 and out through the chan- The two cylinders 21 and 33 are the cylinders-"- used in drawing fluid into and pumping it Vfrom the pump. It will be noted lthat the cylinder 33 f member may also be threaded on the piston. A n

lis, larger than the cylinder 21, -and the crossI sectional area of the cylinder 33 is approximately twicev that of the cylinder 271 for a reason hereinafter more particularly explained. A vdouble ended-pistonl is fitted with the large lower end irilthe cylinder 33 and the smaller upper end in the cylinder 21. T he piston Y4| is hollow as indicated at 42m-order that iluid may flow through the piston from the chamber 43 provided by the lower cylinder 33,Y into the chamber 44 providedv by the cylinder21. f Y

The large end of the piston is threaded on its outside wall as indicated vat 46 and a ring 41 is threaded onto this outside wall. A cupped cap member 48 is. provided with threads on the inner wall of `the flange portion thereof,and this cup ,pair of .washers 49 and 5| are clamped on the large endof the piston 4| betweenthe ring 41 and the cap 43. The washer 49 is placed on the piston. 'with .its outside edge depending downwardly over the end of the cap to resist' pressure Vof the fluid withinthe chamber 43'and the washer .5| isarranged with its outer edge' extending upwardlyover` the ring 41 so as'to resist any ilow lor pressureof fluid downward into the chamber 43. .The rings 49 and 5| thus form aseal over -practicallythe entire widthof the edge of the large end of the piston..l

...Thecap 48 also serves tohold in place a valve page 52, a ange of which is caught between the cap 48 and the lower end of the piston'4l. Y A fiat disk valve 53,is located within the valveY cage 52 4and is resiliently engaged against theupper face ofthe cap 48 by means of a spring 54. Anopen-l ing 58 is provided through the cap 48 andwhen the piston moves downwardly, iiuid trapped withf in the chamber 43 passes upwardly through the opening 5,5;in cap 48 and litsthelvalve 53 from its seat. The fluid then passes throughthe opening 51 `of' the valve cage and upwardly through Y lthe conduit 42m the piston 4|. Y Y A .An upward movement of the piston 4| creates a-Apartial vacuum inthe chamber 43 and draws Theupper end of the piston 4|;is also Ythreaded jon itsiouter; wall. A pair'of rings 62 ,and E3 are threaded onto the upper end ofthe piston and a g@ ringtll is heldbetween these two'rings.'` A

y.pair .ofl'pump washers' 66.- are .clamped .between the rings 62 and 64, and 64 and 63 and the outer 4edges of these washers extend upwardly over the two uppermost rings to resist pressure within the chamber 44'. t

When the piston 4| moves downwardly, the

iluid which is forced upwardly through the chanf nel 42 of the piston fills the chamber 44 and the excess uid flows out through the conduit 3|. It may readily be understood, since the chamber 43'has substantially twice the' displacement of the chamber 4 4, that when the piston is moving downwardly, half of the fluid from Ychamber 43 ,passes into the chamber 44 and the Yother half passes outwardly through the conduit 3|. On

Vthe up stroke of the piston the fluid in chamber V44 ishforced out through the `conduit 3| by the closing of the valve 53andv a new'supply of iiuid is drawn into'the chamber 43. n o

It lmay be readily understood that the same quantity of uid is forced from the conduit 3| kon the up stroke of the piston as well as the down stroke and thus a'compara'tively continuous ow of iiuid is produced when the'pistonis reciprocated. The eiort required to pump fluid is sub- Vstantially the same on both strokes of the'piston.

These rods areas indicated in the drawings, and are iiattened out in order that'they may` be vsecured. to the z large lower portion of the piston 4| as by Vmeans `o1 bolts 68. .Y The .upper ends of the rods B1 are threaded'and theV ends of a depending yoke |53' are fastened to the upper ends of the rods, as by means of nuts 1|.

AY longitudinal opening'12pis provided inthe lower portion of the yoke 69 and an eccentric strap 13 is pivotally connected to the yoke in the opening 12 by means of, a vpivot pin 14,.V A shaft 16 extends transverselyjthrough, and is journalled,

in, the VWalls ofthe housing |,1 and an eccentric 11 is fastened to. the shaft 16 withinY the eccentric strap 13.'`V Asmayreadily be` understood, ro-

tary motion of thenshaft' 16, by means ofthe eccentric 11 and/strap 13, produces reciprofcatory'V motion of the yoke 69, and hence of the piston 4|.' The shaft 16 may be rotated in any desired mannerV as by means of the pulley 18.

VThe chamber 19, within the.V lower housing I2,V

may tend-to become filled with fluid which seeps past the pistonAl, and in order todrawf'ofi this fluid, I may provide abossr ,8| on the'upper wall of lthe base plate; between the cylinder 33 and housing |2, and may provide ai'ltting rrextending part Way upwardly into the chamber 19,*which` viitting .is threaded into the boss 8|.

The upper end rof the tting- 82 is providedwith a yoke 83 Y60 having a lever arm`84pivotallyattachedatone Y end thereto as indicated atf.. The lever arm Y Alink 9| isloosely engaged to the valve 89 and the,V l Y' lever larm-84l so that raising of the vfloat l'ocou'rsV when-'the seepage fluid within Vthe Vcylinder l|2 reaches thefifloat. lA channel, indicated at192, leads downwardly from the valveY seat88 intothe V84'is curved so as to curve about 'the' cylinder 3,3

etv 1 base plate and a transverse channel 93 leads the Valve 58.

It may readily be understood that when the iiuid within the chamber 19 reaches a level near the top of the iioat 81, the oat rises and lifts the valve 89 from its seat. The iiuid within the chamber then flows downwardly through the channels 92 and 93 and is caused to be drawn from the channels by the suction of the piston 4I, to withdraw the seepage uid from the chamber 19.

The channel 93 extends on outwardly and upwardly through the edge of the disk II as indicated at 94, and a needle valve 96 is adapted to close the channel 93. If desired the valve 96 may be opened to permit a certain amount of air to be drawn into the chamber 43 with each stroke of the piston.

The lower portion of the chamber 95 in the upper housing I1 serves as an oil reservoir. The ribs 23 extend part way up on the walls of the housing I1 and thus permit the bottom portion of the housing to be closed. Oil may be placed in this space to a depth, indicated by the dot and dash lines, such that the yoke 69 dips into the oil at the bottom of its travel and causes the oil to lubricate the parts of the eccentric and the bearings of the shaft. The rods 61 are a fairly close fit in the bores 24 of the ribs 23 so that the oil is-prevented from passing into the lower part of the pump.

It is apparent that the cylinders 33 and 21 may be placed close together as shown in Figure 1 and a short piston 4I used for forcing iiuid from the lower chamber 153 into the upper chamber 44 and out through the exhaust channel 3 I It is apparent, however, that if desired, the cylinder 33 may be placed at a considerable distance below the cylinder 21, and the piston 4I correspondingly elongated so that the fluid may be drawn into the lower chamber and forced through the long piston into the upper chamber and out by the upper portion, so that the pump may be used in deep wells.

A modified form of pump utilizing this idea is shown in Figure 3. In this modification the channel I4 is closed off by means of a long pipe 91 which is substituted for the plug I6. The piston 4I is elongated by means of pipe sections Ma, connected by pipe nipples 40. A cup-shaped cylindrical member 33a is substituted for the cylinder 33 and base plate II and an opening I 4a is provided in the lower wall of the cylinder 33a. A valve cage 62a, valve 58a, and spring Bla., corresponding to the valve structure formerly placed on top of the plate I I, is placed over the opening Ma, and is secured to the wall by threading the cage into a suitable threaded ange Ia on the upper face of the bottom of the cylinder 33a. The cylinder 33a is secured to the lower end of the pipe 94 by means of a ring 98 which has threaded connection with the cylinder 33a, and the pipe 91.

It is apparent, by inspection of the drawings, that on upward movement of the piston Illa, fluid is drawn into the chamber 43a, through the Valve opening Ita, and that on downward movement of the piston, fluid is forced upwardly through the valve opening 56a at the bottom of the piston and through the conduit 42a Within the piston. On continued reciprocation of the piston, the conduit 42a is finally filled and uid is forced into the chamber 44a at the upper end of the piston. A portion of the iiuid is driven outwardly and discharged through the conduit 3Ia while the other portion flows into the chamber 44a. on downward movement of the piston. On the next up stroke of the piston, the fluid entrapped in the chamber 44a is forced out of the discharge conduit 3 Ia.

It is apparent that by utilizing two cylinders, one of which is approximately half the volume of the other, I am enabled to secure discharge of fluid from the pump during both up and down movement of the piston. By utilizing my 1mproved structure, including the hollow piston, I am enabled to provide a pump which does not need packing means for the pump shaft other than the means employed for sealing the piston i self.

It is apparent that my pump may be arranged for reciprocation in a horizontal rather than a vertical direction. This and other modifications may be made without departing from the spirit and scope of my invention as set forth in the appended claims.

I claim as my invention:

1. In a pump, a cup-like upper housing, a lower housing, a piston in the lower housing, piston rods passing through the lower wall of the upper housing, and the upper housing having means surrounding the rods for a portion of their length within the upper housing whereby a chamber is formed in which oil may be placed, and means for reciprocating the piston rods adapted to be lubricated by the oil in the chamber of the upper housing.

2. In a pump, an upper housing, an open cylinder depending from the lower wall of the upper housing, a lower housing, a valve in the lower housing, a piston in the depending cylinder, a

valve in the piston, and a pair of pump rods en' gaged to the piston and passing upwardly therefrom through the lower wall of the housing, the lower wall of the housing being provided with upwardly extending ribs having bores therethrough in which the pump rods are located, whereby lubricating fluid may be placed in the cup-like upper housing for lubrication of the parts of the device.

3. In .a pump, a lower housing, an upper housing, a cylinder depending from the lower wall of the upper housing, a cylinder extending upwardly from the upper face of the lower wall of the lower housing, a valve in the lower housing within the cylinder, a double-ended hollow piston with one end in one cylinder and the other end in the other cylinder for pumping fluid from the lower cylinder into the upper cylinder, the diameter of one end of the piston being greater than the diameter of the other, a valve within the piston, means for discharging uid from the upper cylinder, and pump rods attached to the piston and extending through the lower wall of the upper housing and into the upper housing, and a reciprocating mechanism located in the upper housing.

ARNOLD BOHNENBLUST.

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