US2439468A - Screened pump - Google Patents

Description

April 13, 1948. R. H. HOPKINS SCREENED PUMP Filed Feb; 20, 1946 I uverltor nen.-

Patented Apr. 13, 1948 UNITED STATES PATENT OFFICE Roy H. Hopkins, Alice, Tex.

Application February 29, 1946, Serial No. 648,984

My invention relates to improvements in hydraulic pumps, particularly those used for dipping oil or water from subterranean levels. In conventional pumps of this character certain precautions are taken to exclude undesirable `sand particles from such liquids, such as surrounding the pump by a screened jacket through which the liquid is drawn and by providing a sediment chamber in the base of the pump into which the sand particles may gravitate.

However, such methods are frequently inadequate and the sand usually finds its way into the mechanism of the pump and by its abrasive action causes premature wear and undue failure of the same. Frequently, the sand also obstructs the movement of the pump plunger whereupon the latter must be withdrawn for cleaning, thus causing inconvenient delays in operation.

It is therefore the principal object of my in' vention to provide a screen pump in which the mechanism is protected from said sand particles in such manner, that the above stated defects now in existence will be eliminated.

A further object of the invention is to provide a screened pump which is readily accessible for the removal of sand which has been separated by the screen.

A further object of the invention is to provide a screened pump in which the screening element is easily applicable to existing pumps now in use without such improvement.

With the above more important objects in view and such other objects as may become apparent as this specication proceeds, my invention consists essentially of the arrangement and construction of parts as illustrated in the accompanying drawings in which:

Figure 1 is a longitudinal elevation showing the assembly of my invention, the same being partially broken away to reveal its construction,

Figure 2 is a detail showing the upper portion of Figure 1 in longitudinal cross-section,

Figure 3 illustrates my screening element,

Figure 4 the crosssectional View taken along the line 4-4 of Figure 3, and

Figure 5 is a perspective View showing a bottom collar used in the assembly illustrated in Figure l.

Referring now to the accompanying drawings in detail, my invention consists of a perforated cylindrical shell I, formed from a length of conventional oil or water screened pipe and having the ends thereof internally threaded to receive the top collar 2 and the bottom collar 3. A suitable pipe 4 is screwed into the upper end of collar 2 and extends to the ground surface.

2. Claims. (Cl. S-179) A cylindrical liner 5 containing the pump mechanism hereinafter more particularly described, extends between thelimits of the arrows E-B indicated in Figures 1 and 2,.and is rmly clamped in position between the chamfered upper edge l of the collar 3 and an internal shoulder 8 formed in the bore of the collar 2. The liner 5 is concentrically disposed with respect to the shell I and is separated therefrom to form an annular chamber 9.

The aforementioned pump mechanism comprises a plunger rod I0 to which is imparted a reciprocating movement by any suitable machinery on the ground surface. Rod I 0 is connected to a top'cage I I containing a ball and seat I2, the latter being externally threaded to receive the upper end of the plunger I3.

lIvhe plunger is slidable in a pistonlike manner inside the bore of the liner 5 and carries at the lower end thereof an extension I4 commonly known as the garbutt rod. This extension is provided at its upper end with an enlarged head I4 and is threaded medially of its length to accommodate a nut I5, together with a lockwasher I6.

The lower end of the rod I4 in turn, carries a lower cage Il containing a further ball and seat I8, whereupon a cylindrical adapter I9 commonly known as the standing valve body is screwed into the lower end of the cage Il. V

It will be noted that the bottom collar 3 is provided with a plurality of radially extending apertures 20 whereby the liquid entering the chamber 9 through the perforated shell I may pass into the adapter I9 and to the associated pump mechanism. The essence of my invention consists of a, tubular sediment jacket 2| closed at the lower end 22 thereof and being suitably threaded at the upper end 23 into the lower end of the collar 3. The latter is internally threaded near its upper end as at 24 to accommodate an externally threaded shoulder 25 of the screen casing 2B. The casing is of a cylindrical configuration closed at the lower end 21 thereof and employs a wire gauze of suitable mesh for its lateral side 28. It is designed to envelop the adapter I9 substantially as shown in the accompanying drawings and extends partially into the jacket 2l, leaving a sediment chamber 29 at the bottom thereof.

When my invention is placed in operation, the liquid entering the chamber 9 through the perforated shell I will be strained thereby as in conventional practice and the coarser particles of sand eliminated therefrom. 'Ihe liquid will then pass through the apertures 20 of the collar 3 and drained into my sediment jacket 2l, but

prior to entering the adapter I9 and the associated pump mechanism it will pass throughmy screen casing 26. This being of liner mesh than the perforations in the shell l Will exclude the smaller particles of sand which were formerly allowed to enter into the pump. The advantages of my invention are thus clearly apparent. The sand accumulating in the sediment jacket 2l may easily be removed therefrom by unscrewing the same from the collar 3.

It will be observed that the extension I4 will facilitate free reciprocation of the plunger l5 While pumping. However, when the pump mechanism is being disassembled for cleaning or other purposes, the head I4' will pull the extension lil and the associated elements l1 and I9 from the shoulder 25, as the plunger is withdrawn from Y jacket and a tubular screen casing secured to one of said collars, said casing communicating with said pump plunger and valve mechanism and extending into said jacket, and said jacket communicating with said chamber through a plurality of apertures formed in said collars.

ROY H. HOPKINS.

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

UNITED STATES PATENTS Number Name Date 1,045,282 Hahn Nov. `26, 1912 1,347,806 Fender ---l July 27, 1920 1,578,720 Derby Mar. 30, 1926 1,751,017 Sullivan Y Mar. 18, 1930 2,178,822 Upton et Val Nov. 7., 1939

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