US2500624A - Hydraulically operated pump - Google Patents

Description

www

YMarch i4, 1950 v w. R. BMLEY HYDRAULCALLY OPERATED PUM? Filed Feb. 19, 1948 ATTORNEY Patented Mar. 14, 1950 UNITED STATES PATENT OFFICE HYDRAULICALLY OPERATED PUMP Walter R. Bailey, Calgary, Alberta, Canada Application February 19, 1948, Serial No. 9,475

(Cl. S-48) 2 Claims. l

My invention relates to a hydraulic differential pump having as its object the raising of liquid from depth, such as from an oil well, by hydraulic means applied at and from the ground surface to the lowered pump in place of the employment of conventional pump rods, the operation of such rods requiring the expenditure of a considerably greater amount of power than that required to operate my invented pump.

An advantage in using this pump is that the small diameter of the pipe used to convey the compressed operational liquid is considerably less expensive than the rods and necessary couplings, and there is less wear and tear, since the rods are subject to much frictional deterioration needing replacement, which detriment is not evident in my invention.

A further advantage is that this pump is so compact in comparison with other pumping equipment, and with its tubing is readily lowered inside the existing tubular casing in a well, and it particularly adapts itself to more shallow water wells. Also it may be completely submerged without affecting its operation at all, andv it may be drawn to the surface within the well casing for attention andrepairs.

It is to be understood that an initial source of power is available as required to hydraulically operate the piston for its reciprocation against a spring, and of suiiicient force to raise the delivered fluid, such source being on the ground above in the form of a high pressure prime mover.

With the above mentioned object and advantages in view this invention consists in the novel features of construction hereinafter described and claimed and referred to in the drawings accompanying this speciiication.

Fig. 1 is a part sectionalized elevation of the pump, showing valves closed. v

Fig. 2 is an elevation of the pump, showing valves open.

Fig. 3 is a plan view of thepump with spring and top cover removed.

In the drawings, the numeral I refers to a vertically disposed cylinder having a threadably attached closure cap 2. This cap is threadably apertured at 3 to receive a delivery pipe 4. The bottomend of this cylinder is closed with a cap 5 screwed thereon, and having an intake aperture 6 for the threaded connection of a suction pipe therein. This bottom cap is also centrally apertured at 'I from which a cylinder 8 of smaller diameter than the cylinder I extends downwardly and forms a pressure chamber with a threaded inlet 9 at its bottom end, and is closed at this end as at I0.

A piston I I is reciprocal within the cylinder I, and is annular in shape, and is fitted with seal rings I2, and is free to ride concentrically on a webbed valve member I3. The bottom end of this valve is flanged as at I4, the upper face of said ange being bevelled at I5 inwardly towards the circular body part of valve I3, so that the inside lower circular edge of the piston, being bevelled, will contact the seat I5 in valvular manner. A retaining washer I6 is affixed to the top of the valve I3 and limits the travel distance of the piston on the valve, and also acts as a base for a spring I'I compressibly braced between the same and the cap 2.

A slidable valve stem I8 passes centrally through the valve member I3, in and around which stem are circular grooves I9 and 20 slightly spaced apart for valve retention means as later described. The bottom of ange I4 has a boss 2l projecting therefrom to screwably receive a tubular piston rod 22 reciprocal within the lower cylinder 8, said rod terminating in a piston 23 having rings 24, and slidable in the said cylinder 8. This piston rod has ports 25 apertured just above the said piston, and also ports 25a slightly below the boss 2|. The bottom inside circular face of piston 23 is bevelled at 26 to seat a valve 21 on the lower end of a valve stem 28 passing centrally up the tubular rod 22 to connect with the bottom end of valve stem I8, being actually integral therewith. The stem 23 extends down beyond the valve 21 within striking distance of the bottom plate I0 of the cylinder 8 as seen at 28a.

The flange I4 is transversely drilled to receive spring locks consisting of balls 29 to t into grooves I9 and 20 in the stem I8, ball retaining springs 30, and set screws 3l to keep the said springs in place. The purpose of these spring locks is to maintain the stem I8--28 in place during transition periods of valve activities.

The valve member I3 has radial webs 32 vertically disposed around the stem I 8 providing spaces through the member for the flow of liquid from below to above the piston II past the valve contact faces I5.

The operational procedure of this pump is as follows. First liquid is forced into the chamber or cylinder 8 below the piston 23, which lifts the complete assembly inv the two cylinders I and 8, compressing the spring I'I. Any liquid above the piston I I is forced out of the delivery end of the cylinder I through the outlet pipe 4. Displacing liquid is suctionally drawn through the ontake 6 to ll the space between the pistons II and 23. As soon as the stem I8 and its associated assembly reaches the top of its stroke to contact the 3 cap 2 the assembled parts on the stem continue to move upward slightly relatively raising the valve I3 on its stem I8, to also move the lock spring balls 29 from groove 2D to groove I9, and at the same time opening the valve 21. This valve opening allows pressurized liquid to enter the tubular stem 22 and eject through ports 25 and 25a into the cylinders 8 and l.

As pressure is released on the piston 23 the spring i1 moves the piston assembly back to the 'former position, while piston Il is returned by the washer I6 as the liquid below the piston is passaged past the separated valve faces at l5 up into the delivery end of the cylinder l. When the valve stem 23a contacts the bottom of, thecylinder S the valve 21 is again closed and maintained so by the balls 29 again becoming locked in the grooves 20, as seen in Fig. 1.

It is understood that there would be conventional clieck valves in circuit with intake and outlet pipes of this pump.

It is important to note that there is a continual ow of compressed operational liquid through the intake pipe at 9 so that on a return stroke the intake column as well as fluid already in the cylinder 8 will pass through the pipe 22 and discharge into the upper cylinder l through the ports 25 and 2te.

Thus the diierentiation is concluded when a high pressurized liquid is introduced into the pump through a small pipe to operate spring checked valves, and in consequence to forceably create suction for delivery through the Said valves. t is to be noted that the pressurized operational liquid mixes with the sump intake liquid at every alternate stroke, this mixing being of no serious consequence since it is only a matter of proper separation at the surface.

What I claim and desire to secure by Letters Patent is:

1. In a hydraulically operatedy pump as described, an upper main cylinder, a piston within said cylinder, a closure cover for said cylinder, a valve member concentric with and slidable longitudinally within said piston and valvularly seated therewith, a stoprwasher langing aroundy the top of said valve member, an upper stemr slidable within said valve member and concentric therewith, a, secondary smaller cylinder extending downwardly from the otherwise closed bottom end of said upper cylinder, a suction and a delivery intake and outlet passageway respectively below and above said piston, a tubular piston rod integral with said valve member, a pistonon said rod slidable within said secondary cylinder, a pressurized liquid intake apertured into said. secondary cylinder below itspiston, a, closure valve at the bottom of said piston rod, a lower stem integral with said upper stem and below said closure valve and contactable with the bottom closure plate of said secondary cylinder, comfil 4 munication ports between the tubular piston rod and both said cylinders, flexible means to return the slidable interior assembly of parts after the said upper stem has contacted the upper cylinder top cover to open the valve member within said upper cylinder for passage of liquid from below to above said annular piston until said lower stem has contacted bottom to close the bottom valve of said tubular pistonrod, and automatically releasable means tolock the said upper stem for valve open and close positions relative to the slidable valve members.

2. A hydraulically operated pump comprising in combination an upper main cylinder, a top and bottom closure-for same, said closures having outlet and inlet openings respectively, an annular piston slidablewithin said cylinder, a valve member slidable longitudinally within said piston and webbed for the free passage of liquid therethrough,` stop means to limit the piston stroke of the valve member at thev top of same,l circular contactable valve seats on said valve member and said piston, an upper stem axially slidable within said valve member and contactable `with the top cover to control the flow of liquid through these valve openings formed by said seats and webs,i a small diameter cylinder communicating with and downwardly from the bottom of said upper cylinder, a tubular piston rod: within said small cylinder integral with said valve member, a piston on said tubular piston rod.l reciprocal within said small cylinder, a lower stern within said' tubular piston rod and integral with said valve member stem, an inlet for high pressure pump-operating liquid apertured into the bottom of saidsmall cylinder, a high pressure control valve on said. lower stem for opening and closing the bottom end of said tubular piston rod to control the ow of operating liquid into they said upper and said smaller diameter cylinders through ports in said tubular piston rod, and closed when the. said lower Stem strikes the bottom of the; small cylinden a, spring braced between said interiorly webbed. valve member and the top cover of the upper cylinder, contractable on pressure stroke and, ex-

pandable on and to energise the return stroke of the webbed valve member following. the completion of a delivery stroke, and springJ lock means between the said upper stein and the said webbed valve member to retain their relatively varying positions.

WAL'IERV R. BAILEY.

REFERENCES orrnn The following references areof record in the le of this patent:

UNITED STATES PATENTS Number Name Date 623,297 Weatherhead Apr. 18, 17899 2,057,364 Bystricky Oct. I3, 1936

Images