US2793594A - Deep well pump - Google Patents

Description

May 28, 1957 J. A. A. GoNcALvEs DEEP WELL PUMP Filed Sept. 50, 1955 Y JNVENTOR., .Joaquim AA. ancalv nited States VPatent "ce DEEP WELL PUMP Joaquim A. A. Gonalves, Cidade de Goa, India Application september so, 195s, serial No. 537,830

3 Claims. (Cl. 103S) This invention relates to pumps, and more particularly has reference to a pump adapted for deep well installations, the pump being, however, well adapted for use in wells lother than those falling within this classification.

One important yobject of the present invention is to provide a deep well pump which will `operate with greater efficiency than conventional deep well pumps known to the prior art.

Another object of importance is to provide a deep well pump as described which, though -of improved efficiency as compared to the prior art devices, will still be capable of manufacture at a cost lower than the pumps previously devised.

Yet another object is to provide a pump as stated which will be simply designed so as to reduce maintenance costs, and will yet :be rugged 'and substantially trouble free in operation.

A further important object of the present invention is to provide la deep well pump which will be capable of installation, with marked facility, in a Well having a smaller bore than that usually required for a conventional pump assembly pumping an equivalent amount of water or other liquid.

Other objects will appear from the following description, the claims -appended thereto, `and from the annexed drawing, in which like reference characters designate like parts throughout the several views, and wherein:

Figure` 1 is a somewhat diagrammatic view, partly in side elevation and partly in vertical section, of a pump formed according to the present invention; and

yFigure 2 is :a transverse sectional view on line 292 of Figure 1.

With continued reference to the drawings, the pump constituting the present invention includes a pair of spaced, stationary, upstanding bearing posts or standards and 11, in which are'rotatably supported the opposite end portions of a horizontally extending main shaft, generally indicated at 9. The main shaft 9 is deiined by shaft sections 12 and 12 which are mounted to rotate about a common axis. Sections 12 and 12' each have one end thereof journaled in standards 10 .and 11, respectively, and extend toward each other. At their other ends, each shaft section has a laterally-extending crank arm 14 and `15, respectively, and spaced in rel-ation to each other. Crank arms 14 and 15 are provided at their free ends with coaxial bearings 118 and 19, respectively. A crank, smaller than the cranks dened by the shaft sections 12 and 12', and their respect-ive crank - arms 14 and 15, is journaled at its opposite ends in the bearings 18 and 19 to extend between the main shaft sections or cranks 12 and 12' and to rotate about an axis which moves in lan orbit about the common axis of the main shaft sections.

Pivotally connected at its upper endto the bight portion 21 yof the smaller crank 20 is a connecting rod 22 the other end 23 of which is bifurcated and connected pivotally by a transversely extending pin 24 to the up- 2,793,594 Patented May 28, 1957 2 per end of a vertically disposed piston rod 26, the upper end portion of which is slidably engaged in a stuing box or gland 28. The lower end of the piston rod 26 has secured thereto a piston 30 working in a cylinder 32, the gland 28 .being mounted in the upper end wall of the cylinder.

Communicating with the lower end of the cylinder is one end of a slide valve housing 34 the other, lower end of which is formed Aopen as at 36. Horizontally reciprocable within the housing 34 is a .slide valve 38 of plate-like formation having intermediate its ends a valve opening 40. Connected to one end of the .slide valve 38 is an expansion spring 42 the other end of which is hooked or otherwise connected to an ear 44 depending from the lower end of the cylinder 32, said spring normally shifting the valve 38 to the right in Figure 1. When the valve 38 is shifted to the left in Figure 1 lto the position thereof illustrated, the opening 40 Ithereof permits iiow of air through the valve housing 34 into the cylinder 32.

Pivotally connected to the other end of the valve 38 is an elongated cable or other flexible element 46 trained intermediate its ends about a direction changing pulley 48. :The cable 46, after being trained about the pulley 48, is extended upwardly against the ground surface, and is there connected to the outer end of -a lateral extension 49 (Figure 2) formed upon the outer, free end of a vertically swingable lever Sti pivotally connected at 52 to the post 10..

Up and down swinging movement of the lever 50 is controlled by a cam 54 of elliptical or oval shape, secured lto the main shaft section 12 for rotation therewith. When the cam is in the full l-ine position thereof shown in Figures 1 and 2, the lever 50 is raised, to shift the valve 38 to its illustrated posit-ion against the restraint of spring 42, thus to permit air to flow through the valve housing 34 into the cylinder 32. When, however, -the shaft is rotated degrees from the position thereof illustrated -in the drawing, the cam 54 will be turned to the dotted line position thereof Ishown in Figure 2, thus permitting the lever 50 to be lowered under the pull exerted by the spring 42, causing the valve 38 to move to a closed position.

Connected in communication with the cylinder is an elongated, vertically disposed intake pipe or conduit 56. Conduit 56 includes, at its upper end, a horizontally disposed, relatively short, upper end extension 57 connected through the medium lof a short, depending, vertically -disposed conduit portion in communication with the upper end of the cylinder 32. At the juncture of the conduit and cylinder, there is provided a valve housing in which is mounted a check valve 58 arranged to permit flow of water or other liquid through the con- -duit 56 into the cylinder, but preventing back flow of said water into the conduit.

Intermediate its opposite ends, the horizontal extension 57 of conduit 56 is in communication with an air vessel or expansion dome 60, used for the purpose of permitting a continuous flow of water through the conduit.

At its lower end, the conduit 56 includes a U-shaped or semi-circular lower conduit extension 62, and at the juncture of the extension 62 with the main, vertically disposed body portion of conduit 56 there is provided a check valve 64 arranged to permit flow through the conduit 56 only in the same direction as that permitted by the valve 58, that is, a iiow of water only in the direction of the arrows shown in Figure l.

Connected in communication with the other end of the extension 62 is a short, tubular, inlet 66 opening into the subterranean cavity from which the liquid is,v isto be pumped, and provided intermediate its endswithfV a check valve 68 permittingv flow only in a direction1 into the conduit 56. The inlet 66, a-s shown, is preferably inclined downwardly in a direction away from the intake conduit.

Above the inlet 66, the semicrcular extension 62 is in communication with a vertically ascending, tubular chamber 70 which communicates at its upper end with a connecting conduit 72 coaxial with chamber 70 and communicating at its upper e'nd with the lower end of the cylinder 32, the connecting conduit 72 being of reduced diameter relative 'to the chamber 70.

Also connected in communication with the upper end of the cylinder 32 is a check valve housing 74 in which is provided a check valve 76 operable in a manner to permit only `tlow of liquid out Vof the cylinder 32 into an outlet conduit 78 into which the valve housing 74 opens at its upper end. Conduit 78 has a short vertical portion communicating with valve housing 74, and said portion opens at its vupper end into a horizontally disposed conduit portion Si) provided intermediate its ends with an air vessel or expansion dome 82. At its other end, the conduit portion 80 is in communication with a vertically ascending conduit portion 84 which discharges into a storage tank 86 or other means to receive the pump liquid.

The pump installation can be mounted in the manner shown in Figure l, with the bearing posts 10, 11 being mounted at ground level 88 upon a suitable cementitious slab or the like, and the cylinder 32 being mounted within an upwardly opening, large diameter cavity 90. The well bore has been designated at 92, and the chamber 7i), connecting conduit 72, and intake conduit 56 extend within said well bore. Of course, the well bore can open directly upon the ground level d3, with all portions of the pump with the exception of the chamber 7i?, conduit 72, and conduit '56 being disposed above ground level.

ln operation, and lwith the parts initially in the position thereof show-n in Figure l, the piston 30 will be in its lowermost position and slide valve 38 will be open. The pressure within the cylinder above the piston will be atmospheric.

As the main shaft 9 rotates, the piston begins to rise and the -slide -valve 3S moves to closed position. Since the cylinder is no longer in communication with atmosphere, due to the closing of the valve 38, at the lower end of the cylinder, a vacuum will be created between the lower `end of the cylinder and the ascending piston. Said vacuum will be communicated to chamber 7 0 through the connecting pipe 72, causing check valve 68 mounted in inlet 66 to move to open position. The vacuum, further, is transmitted through the extension 62, causing check valve 64 to move to closed position. At the same time, `the upward movement of the piston within cylinder 72 causes check valve S8 to move to closed position while check valve 76 moves to open position.

Since valve 68 is open, as the piston rises water or the other liquid being pumped Will be sucked through inlet 66 into the chamber 7l). In a preferred embodiment, the liquid would rise within chamber 70 `to a height of approximately 25 feet.

The piston is now at the upper limit of its travel, and since main shaft 9 has been rotated during the upward movement of the piston through 180 degrees, the cam 54 will again be in the full line position thereof shown in Figures l and 2, raising lever 50 and thus causing valve 38 to open at the time that the piston 30 reaches its upper extreme position. This admits air through valve housing 34 into the cylinder 32, below pistou 3i), so that there is now atmospheric pressure below the piston within the cylinder.

As the piston, on continued lrotation ofthe shaft, begins to descend, the inlet valve 68 closes and the liquid that was previously sucked into chamber y70is forced through the now open valve 64 upwardly in the direction ofthe arrows within the conduit 56. After a few strokes,

the liquid will reach the air vessel 6). When the piston next begins to descend, a vacuum will be created thereabove within cylinder 32, and the liquid will now flow past the check valve 58 into the upper portion of cylinder 32. When the piston next ascends, valve 58 will close and valve 76 Will open, so that the liquid now in the cylinder 32 will be forced upwardly through the outlet conduit S0, into the tank 86. A continuous ilow of liquid into the tank will subsequently occur, during continuous rotation of the main shaft V9.

The purpose of the smaller crank 20, freely rotatable upon the crank arms 14 and 15 of the main shaft 9, is to stop the piston at the extreme ends of its travel for a small period of the stroke to allow air to ow into or out of the cylinder according to the piston position. For example, when the piston is at the upper limit of its travel, this air will be admitted through the opening 40 at atmospheric pressure. When the piston is at the lower limit of its travel the air previously admitted will now flow outwardly through the opening 40, since the slide valve 33 as previously noted herein is in open `position at both limits of the travel of the piston. 'The outflow of air under the conditions last mentioned is to enable a vacuum to be created in the cylinder when the piston next moves upwardly.

The pump formed according to the present invention is particularly adapted for deep well installations, and in the illustrated embodiment can eiciently operate to pump from a depth of 200 feet a substantial volume of water per minute. For deeper installations, it may be desirable to apply supplementary pressure below the piston, as for example by tiring a gaseous fuel therebelow, at timed intervals to produce a booster effect against the underside of the piston tending to raise the same on each reciprocating stroke thereof.

ln the event the lift from the vessel 82 is high, a part of the air compressed below the piston 30 can be selectively introduced into the vessel through a check valve le@ in a compressed air bleed line 102. One end of the bleed line is in communication with `the bore through the valve housing 34 between the piston 3l) and the valve slide 38, while the other end of the bleed line opens into the vessel 82 through the top thereof. A lock rod 104 can be `selectively operated to lock and unlock `the check valve to permit or prevent flow of compressed air therethrough and into the vessel 82 by being moved in a vertical rectilinear path into and out of locking engagement with a squared end 106 of the valve llap shaft, and the valve is shown in its locked position in Figure l.

It is believed apparent that the invention is not necessarily confined to the specific use or uses thereof described above, since it may be utilized for any purpose to which it may be suited. Nor is the invention to be necessarily limited to the specific construction illustrated and described, since such construction is only intended to be illustrative of the principles, it being considered that the invention comprehends any minor change in construction that may be permitted within the scope of the appended claims.

What is claimed is:

l. A pump comprising a cylinder; a piston reciprocating therein; means connected with the piston for reciprocating the same; intake and outlet conduits respectively connected in communication at one end thereof with one end of the cylinder, the outlet conduit at its other end being provided with a discharge opening for a pumped liquid; a chamber connected between the other end of the cylinder and the other end of the intake conduit; an inlet for said liquid connected in communication with said chamber; a. check valve in the inlet for permitting tiow of the liquid only into the same from a cavity from which the liquid is being pumped; a check valve in the intake conduit for permitting flow therethrough only in the direction of said one end of the Vintake conduit; a

check valve in said one end of the intake conduit and a check valve in said one end of the outlet conduit, respectively permitting flow one into and one out of the cylinder; a valve at the other end of the cylinder for connecting the interior of the cylinder at said other end thereof with atmosphere; and means for opening the last named valve at the opposite extreme limits of the piston travel.

2. A pump comprising a cylinder; a piston reciprocating therein; means connected with the piston for reciprocating the same, comprising a main, rotary drive shaft having a cranked intermediate portion; a crank smaller than the cranked intermediate portion freely rotatable upon said cranked intermediate portion; a connecting rod pivotally attached at its opposite ends to the piston and said last named crank respectively; intake and outlet conduits respectively connected in communication at one end thereof with one end of the cylinder, the outlet conduit at its other end being provided with a discharge opening for a pumped liquid; a chamber connected between the other end of the cylinder and the other' end of the intake conduit; an inlet for said liquid connected in communication with said chamber; a check valve in the inlet for permitting flow of the liquid only into the same from a cavity from which the liquid is being pumped; a check valve in the intake conduit for permitting flow therethrough only in the direction of said one end of the intake conduit; a check valve in said one end of the intake conduit and a check valve in said one end of the outlet conduit, respectively permitting How one into and one out of the cylinder; a valve at the other end of the cylinder for connecting the interior of the cylinder at said other end thereof with atmosphere; and means for opening the last named valve at the opposite extreme limits of the piston travel.

3. A pump comprising a cylinder; a piston reciprocating therein; means connected with the piston for reciprocating the same, comprising a main, rotary drive shaft having a cranked intermediate portion; a crank smaller than the cranked intermediate portion freely rotatable upon said cranked intermediate portion; a connecting rod pivotally attached at its opposite ends to the piston and said last named crank respectively; intake and outlet conduits respectively connected in communication at one end thereof with one end of the cylinder, the outlet conduit at its other end being provided with a discharge opening for a pumped liquid; a chamber connected between the other end of the cylinder and the other end of the intake conduit; an inlet -for said liquid connected in communication With said chamber; a check valve in the inlet for permitting flow of the liquid only into the same from a cavity from which the liquid is being pumped; a check valve in the intake conduit for permitting flow therethrough only in the direction of said one end of the intake conduit; a check valve in said one end of the intake conduit and a check valve in said one end of the outlet conduit, respectively permitting ow one into and one out of the cylinder; a valve at the other end of the cylinder for connecting the interior of the cylinder at said other end thereof with atmosphere; and means for opening the last named valve at the opposite eXtreme limits of the piston travel, comprising a lever, a ilexible connection between the last named valve and lever, and a cam wheel rotatable with said shaft for oscillating the lever responsive to rotation of the shaft in timed relation to reciprocation of the piston, whereby to impart back and forth movement to :said iiexible element for actuating the last named valve to and from an open position.

No references cited.

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