US1828570A - Operating unit for double-acting pumps - Google Patents

Description

Oct. 20, 1931. A. H. KENNEDY 1,828,570

OPERATING UNIT FOR DOUBLE ACTING PUMPS Filed Jan. 13, 1950 2 Sheets-Sheet l &

Flo A-H K INVEN'liO g V m ATTORNEYS Oct. 20, 1931. A. H. KENNEDY 1,328,570

OPERATING UNIT FOR DOUBLE ACTING PUMPS Filed Jan. 13, 1930 2 Sheets-Sheet 2 b a W x 24, o s u INVENTOR ATTORNEYS 4'0" (not'show n).

flanged fitting 13 threaded on its upper end.

Patented Oct. 20, 1931 PATENT OFFICE ALBERT H. KENNEDY, OF ROGKPOR'I', INDIANA OPERATING UNIT FOR DOUBLE-ACTING IPUIVIP S Application filed 2I'anuary13, 1930. SerialNo. 420,531.

This invention relates to pumps and, among other objects, aims to provide improved, simple, efiicient operating mechanism for a double-acting overlapping-stroke pump designed for use in both deep and shallow wells;

Other aims and advantages of the invention will appear in the specification when considered in. connection with the accomm panying drawings, wherein: Y a

Fig. 1 is a sectional view, partly in elevation, showing the preferred form of pump gearing;

Fig. 2 is a front end elevation;

Fig. 3 is a transverse sectional view taken on the line 3-3 of Fig. 1; V

Fig. 4 is a sectional view taken on the line 4-4 of F ig. 1, with certain parts shown in a different position; and v Figl dis a top plan view base. 1

Heretofore, the operating mechanism for double-acting, overlapping-stroke pumps v has been very complex and expensive. Moreover, it has been exceedingly difficult to remove from its position over a well casing in order to make repairs. Further,the operating parts subjected to the greatestwear have notbeen easily accessible. This invention, 0 therefore, aims to improve and simplify the operating mechanism for such pumps so as to enableit to be assembled, mounted, re moved, dismantled and repaired without a great loss of time. p a p Referring particularly to the drawings, the illustrated mechanism is there connected to operate a pair ofconcentric or telescoping sucker rods 10 andll-which extend into a well casing 12 and carry the usual pistons The casing herein has a 6 of a supporting and the sucker rods extend through a stuffing box 14: in a cover plate 15 on the upper end of said fitting,

ported on concrete footings or sills 16 on opposite sides of the casing. A base 17 preferably in the form ofa cast metal pan is conveniently secured to the "footings and presents an opening 18 in one end adapted to re- In this example, the mechanism is supceive the casing head 13 as shown in Figs. 1 and 2. The arrangement is such that the base supports the casing in proper alinement.

The pump gearing is here shown as being mounted between a pair of opposed cast metal frame plates 19 removably secured at their lower ends on the base 17 and connected together by a plurality of struts or spacer members20. Suitable cap screws orbolts pass through the plates and secure them to the struts. The idea is to enable one of the side plates to be removed without disturbing struts or other parts so as'to afford easy and quick access to the parts between the plates. Moreover, the lower edges of the plates may be disconnected'from the base and the whole mechanism slid back on the baseto 'afiord easyaccess to the well casing;

A driving shaft having a pulley 22 secured to one end 21 is shown asbeing journaled substantially centrally of the two plates 19. 'On the shaft is a pair of spur gears 23 adjacent. to the opposed plates. These small gears mesh with larger gears 24 one above the shaft and the other below theshaft so thattheir associated parts are easily accessible without necessitating 1 removal of a number of other parts. These gears are shown as being mounted on tapered portions extending through hollow bosses 27 in the respective side plates and terminat ing in screw threaded ends 28 so that the tapered bearings may be adjusted and tightenedby nuts 29.

Now, in this example, eachof the gears 24 is connected to drive one of the sucker rods 10 and 11. For this purpose, a pair of rocket or oscillating arms 33 presenting elongated hubs 34 journaled on fixed shafts 35 extending through the plates (Fig. 4) are arranged to be operated by wrist pins 36 on the respective gears. These arms are shown in Fig. 3 as being arranged one above the other so as to oscillate in a common vertical plane throughthe axis of the sucker The operating arms terminate in yokes 39 (Fig. 4) and are connected to specially shaped crossheads 40 and 41 on the respective sucker rods by means of pairs of connecting rods or links 43 pivotally connected to the yokes and to the crossheads (Figs. 2 and 4). The arrangement is such that the arms will not tend to bend the sucker rods as the yokes oscillate in circular arcs. This connection between the lower arm to the upper crosshead and the upper arm to the lower crosshead not only enables the connecting rods to be made of adequate length but, also, cuts down the height of the operating mechanism to a minimum for any desired overlap of the strokes. The overlap for each revolution of the driving gears happens to be about 60 in this instance, but it may be varied by moving the pivot shafts for arms toward or away from the gears.

The crosshead 40 is so shaped that the connecting rods 42 for the crosshead 41 can reciprocate between the connecting rods 42 which connect the crosshead 40to the upper arm (Figs. 1 and 4). Herein, this crosshead is formed of a casting presenting channels 43 on opposite sides of the sucker rod so as to afiord ample room for the lower pair of connecting rods to move laterally as the lower arm oscillates. Also, this crosshead conveniently has a vertical slot 44 in its front wall so that it may be easily slipped on the sucker rod and secured to it. A cover plate 45 is preferably bolted on the frontwall of the crosshead across the slot. The side walls or flanges herein have integral t'runnions 46 to which the connecting rods are pivoted. All of the other pivotal connections preferably are similar to these because of the economy effected in making them.

The upper crosshead 41 is shown as being a simple, narrow cast metal block secured to the upper end portion of the inner sucker rod 10.. The connecting rods 42 are connected to trunnions projecting from its side walls like those just described on the lower crosshead.

Both crossheads present similar T shaped extensions 47 integral with their rear walls and these extensions are machined to slide in the same vertical guide which is preferably composed of a flat strip of sheet metal 48 and a pair of angle members 49 suitably secured to it at the opposite edges. The strip 48 is conveniently secured by screws'or bolt-s to the front set of struts 20 which are arranged in a vertical row. The arrangement is such that the guide may be quickly and easily assembled and dismantled. Further, it eliminates a great deal of expensive machining.

To provide for continuous, automatic lubrication of the vbearings, there is shown an oil reservoir or tank 50 arranged between the side frame plates 19 and supported at its op-- posite ends on the upper struts 20 (Fig.1).

The pan-shaped base is utilized as a settling basin for the drippings, having a series of staggered webs or upstanding ribs 51 to cause the oil to flow in a tortuous or zigzag path into a sump compartment at one end, a pair of inclined drip boards 52 being arranged to drain the oil into the compartment at the opposite end. The oil is pumped to the reservoir by means of a pump 53 operated by a connecting rod 54 on the lower rocker arms, a small valved conduit or tube 55 projecting through the bottom of the reservoir. The oil isfed by gravity through a series of tubes 56 to the various bearings and gears (Fig. The gears and rocker arms are flood oiled and all of the oil is recovered.

' From the foregoing description, it will be seen that the improved operating mechanism is very compact in its design; that all of the parts maybe standardized and manufactured very cheaply; that it may be quickly and easily assembled and dismantled by any ordinary mechanic; and that it affords quick and easy access to allof the major parts for inspection and/or repairs. Further, all of the mechanism may be assembled as a unit and i set in place over a well casing, the slot in thebase making it easy to aline the parts properly. Moreover,-the whole thing may be quickly moved to one side to afford ac cess to the well.

Obviously, the present invention is not restricted to the particular embodiment thereof herein shown and described. Moreover, it is not indispensable that all the features of the invention be used conjointly since they may be employed advantageously in various combinations and sub-combinations.

What is claimed is:

1. In a double-acting, overlapping stroke pump, a pair of concentric sucker rods each having a crosshead near its upper end; a frame; a crosshead guide mounted on the frame; separate driving gears between the sides of the frame; rocker arms arranged one above the other in the frame; anti-friction wrist pin connections between the rocker arms and the gears; vokes on the ends of said arms straddling said crosshead guide; a pair of pivoted links connecting the yoke of the lower arm to the upper crosshead; and a pair of links connecting the upper arm to the lower crosshead, one pair of links being arranged to operate between the other.

2. In a double-acting, overlapping stroke pump, a pair of concentric sucker rods each having a crosshead near its upper end; a frame; a crosshead guide mounted on the frame; separate driving gears between the sides of the frame; rocker arms arranged one above the other in the frame; anti-friction wrist pin connections between the ro'cker arms and the gears; yokes on the ends of said arms straddling said crosshead guide; means connecting the yoke of the lower arm to the upper crosshead; and means connecting ihegoke of the upper arm to the lower cross- 3. In combination with a well casing having a pair of concentric pump sucker rods projecting through the upper end, pum operating mechanism comprising a base removably associated with the upper end of the cas- V ing; side frame members removably secured to the base; struts connecting the side frame members; a single crosshead guide mounted on some of the struts crosshea-ds on thesucker rods arranged one above the other and slidaby mounted in said guide; operating gears in said frame arranged one above the other; rocker arm connected to said gears;

and means connecting said rocker arms to the respective crossheads.

4. In combination with a well casing having a pair of concentric pump sucker rods projecting through the upper end, pump operating mechanism comprising a base removably associated with the upper end of the casing; side frame members removably secured to the base; struts connecting the side frame members; a single crosshead guide mounted on some of the struts; crossheads on the sucker rods arranged one above the other and slidably mounted in said guide; one of said crossheads having vertical channels on opposite sides of its sucker rod; separated rocker arms arranged one above the other in said frame; means to operate said rocker arms; and pairs of links connecting the rocker arms to the respective crossheads, one pair of the links extending through said channels in one of the crossheads 5. In a pump operating unit of the class described; a frame including a metal base having an opening near one end adapted to receive a well casinghead and support the casing and operating unit in proper a1inement; a pair of separately removable side frame members; and separated driving gears one above the other between the side frame members, said driving gears and their associated parts being readily accessible and removable when one of said side frame members is removed.

In testimony, that I claim the foregoing as my own, I have hereto affixed my signature.

ALBERT H. KENNEDY.

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