USRE18791E

USRE18791E - ruthven

Info

Publication number: USRE18791E
Authority: US
Publication date: 1933-04-11

Description

A. F. RUTHVEN RECIFROCATING PUMP 2 Sheets-Sheet 1 April 11, 1933.

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Original Filed Feb. 12. 1927 A. F. RUTHVEN REGIPROCATING IUKP Re. 18,791KV 2 Sheets-Sheet 2 April 11, 1933.

Original Filed Feb. l2, 1927 atmen.,

ISC

Reissuecl pr. 11A, 1933 UNITED STATES PATENT OFFICE ALBERT F. RUTHVEN, or AMARILLO, TEXAS, AssIGNoB. To LEATHERLESS PLUNGER PUMP CORPORATION, OF AMARILLO,

TEXAS', A CORPORATION oF TEXAS RECIPROCATING PUMP Original No. 1,730,297, dated October 1, 1929, Serial No. 167,709, filed February 12, 1927. Application for v reissue filed February 19,

rThe present invention relates to reciprocating pumps, such as are used in wells and for other purposes for pumping water, oil or other liquid, and it is an object of the invention to provide a reciprocating pump which eliminates leather and other packings, which reduces friction and wear to a minimum, and which is especially suitable for pumping water or oil containing sand.

Another object of the invention is the provision of a reciprocatory pump including a leatherless floating plunger which operates freely and with minimum friction and wear, the arrangement being such that there are films or sheets of liquid between the relatively movable parts, constituting liquid packing, and keeping the metal parts out of contact.

A further obj ect is to provide a pump embodying telescoping tubular members or sections constituting the pump chamber, with said members out of contact with one another to provide liquid spaces between them, and the ends of such members so formed as to maintain said members concentric and out of contact when the members are. moved together. y

A still further object is to provide a pump of the character indicated comprising a novel assembly of the component elements whereby the pump is especially suitable for pumping water and oil from deep wells, with a minimum possibility of the pump being impaired in its operation by the presence of sand.

It is also an object of the invention to improve the pump generally in its construction and details to enhance the utility and eiiiciency thereof. n

With the foregoing and other objects in view, which will be apparent as the description proceeds, the invention resides in the construction and arrangement of parts, as hereinafter described and claimed, it being understood that changes can be made wit-hin the scope of what is claimed, without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawings, wherein- Figure 1 is a vertical section of a deep well pump embodyingv the improvements, portions being broken away;

1931. Serial No. 517,085.

Figure 2 is a vertical section of a modified construction of deep well pump, portions being broken away;

Figure 3 is a side elevation of a modified f o-rm of plunger, showing the barrel in sec'- tion; l

pump embodying the improvements, :portions being broken away; and l Figure 5 is a sectional detail illustrating a modification in the form of grooves.

Referring to Fig. 1, 10 indicates theusual pump barrelat the lower end of the well casing, and having attached to its lower end the usual liquid inlet member 11 having a tapered seat 12 therein in which is seatedvthe lower tapered portion 13 of a valve seat 14 on which a ball 15 or other valve member' is seatable to provide the lower check valve of the pump. The valve seat 14 has a cage r16 confining the ball or valve member 15 for movement therein and is adapted to be lifted through the barrel 10. A tubular member or sleeve 17 has its lower end screw-threaded or otherwise secured on the valve seat 14 and cage 16, and an annular coupling member 18 is screw-threaded or otherwise secured within the upper end of the sleeve 17 and has an upstanding annular flange 19' screwthreaded interiorly and exteriorly to receive the lower ends of upstanding pump tubes or

sections

20 and 21. The

pump tubes

20, 21 have a telescopic relation with depending pump ytubes or

sections

23, 24, so as to constitute a pump chamber that may be increased and decreased in length to produce the pumping action.

The upper vend Aof thev tube 23 is screwthreaded .on a tubular valve seat 25 which has an outstanding annular flange 26 on which the upper end of the tube 24 is screw-threaded. A ball 27 or other valve member is seatable on the seat 25 to constitute an upper check valve for the pump,and a cage 28-is rs'crev'vthreaded on the seat 25 over the valve member 27 and also provides means for thel connection of the lower end of the pump rod (not shown). The tubes 23,v y241 and upper check valve constitute the plunger of the pump which is reciprocated vertically.

Figure 4 is a vertical section of a force` The tubes20, 21, 23, 24 are of such diameter as to provide minimum clearances between such concentric tubes, and between the outermost tube 24 and the barrel l0, so as to permit said tubes to remain out of contact and to restrict as much as possible the flow of liquid between the tubes. The tubes may be of any suitable length according to the length of pump stroke desired, and the plunger is free to float, that is, itis capable of transverse movement relatively to the

tubes

20, 21, but the films or sheets of liquid between the tubes will keep them out of contact, to thereby reduce friction and wear to a minimum. The upper terminals of the tubes 20, 2l and lower terminals of the

tubes

23, 24 are bevelled or tapered, both internally and externally, as at 29, in order that when the upper and lower tubes are telescoped together, said terminals of the tubes will divide the liquid which they encounter, thereby directing the liquid between Vthe upper and lower tubes effectively andv distributing the liquid to -the inner and outer sides ofthe

1ntermediate tubes

21, 23 in order to keep the tubes out of contact. This makes the pump free acting withoutthe tubes contacting with one another, and the pump operates with negligible friction.

` When the plunger is raised the valve member 27 is seated, so that the liquid above the plunger is lifted, and the pump chamber being enlarged will draw liquid through the inlet member 1l and past the valve member 15. The clearances between vthe pump tubes being small, as well as the clearance between the outermost tube 24 and barrel 10, will restrict the flow of liquid downwardly between the tube 24 and barrel 10 and between the tubes, so that during the lifting action little or no liquid will be drawn from above the plunger into the pump chamber. When the plunger is raised the spaces between the

tubes

20, 21 and between the

tubes

23, 24, beyond the ends of the

respective tubes

23 and 21, will be enlarged, whichwill have atendency to draw the liquid between the tubes, and this tendency will extend into the pump chamber as well as above the plunger, thereby creating an equalizing action, which in addition to the resistance offered to the flow of liquid `between the tubes, will reduce leakage from above the plunger into the pump chamber to a minimum, especially when the plunger is reciprocated at a suiciently high speed. The plunger may move downwardly freely, the valve member 27 opening to permit the liquid in the pump chamber to pass upwardly above said valve member. The pump therefore operates as a lift pump.

In order to lift the lower portion of the pump with the upper portion or plunger thereof, the tube 20 is formed on the exterior near its upper end with a shoulder or collar 30 and the tube 23 is formed on the interior near its lower end with a shoulder or collar 31, and the shoulder or collar 30 seating on the shoulder or collar 31 of the plunger will lift the tube A20 and other parts connected thereto so that they may be removed from the well with the plunger.

A cushion or shock absorber is preferably used to arrest the downward movement of the plunger, should same be excessive. Thus, as shown, a coiled spring 32 seats on the coupling member 18, and supports a buffer ring 33 for the contact of the lower end of the tube 24. Said tube and buffer need not contact, however, during the normal operation of the plunger, but the spring and buffer may be provided to cushion the plunger in its extreme downward movement, before the tubes contact with other metal parts beyond the ends thereof. The end of the tube 24 which contacts with the buffer 33 may be flattened slightly, if desired, for contact with said buffer. A

Drain holes 34 are formed in the tube 20 immediately above the ange 19in order that sand or other sediment dropping between the

tubes

20, 21 may pass down through said holes, and drain holes 35 are also provided in the member 18 at. the lower end of the tube 21 to permit sand to pass downwardly and thus avoid the accumulation of sand above said member 18.

In order to offer resistance to the downward flow of liquid between the tube 24 and barrel 10 and to also avoid interference with the operation of the plunger by sand, the exterior surface of the tube 24 and interior surface of the barrel 10 are formed with ACoonerating grooves 36. These grooves may be either circular or spiral like screw threads, and the grooves may be in bands or zones, as shown, or may be arranged otherwise. The grooves may also extend for any suitable distance vertically of the tube 24 and barrel. The grooves are of ratchet form with lower substantially horizontal walls and upper inclined or bevelled walls. This is for the purpose of increasing the resistance offered to the liquid flowing downwardly between the plunger and barrel, as well as aiding in the elimination of sand between the plunger and barrel. Thus, liquid flowing downwardly between the plunger and barrel encounters the lower walls of the grooves, thereby creating eddies and otherwise offering resistance to the downward flow of the liquid, so as to reduce to a minimum the flow of the liquid from above the valve member 27 into the pump chamber when the plunger is raised. However, when the plunger is moved downwardly the grooves 36 offer less resistance to the upward iow of liquid between the plunger and barrel. The grooves 36 also aid in disposing of sand which may accumulate around the plunger within the barrel, especially after lao thel pump has been stopped for a period of time.

. Thus, any sand which may have accumulated between the plunger and barrel is readily loosened, due to the presence of the grooves 36, in which the particles of sand may move, and the plunger may thus be started much more readily than with the ordinary pump plunger. The plunger is thus freed quickly even though the clearance between the plunger and barrel is small, inasmuch as the grooves 36 enable the sand to become loosened between the plunger and barrel as the plunger is started in motion. The cooperating grooves 36 of the plunger and barrel also have the action of raising the sand, due t0 the ratchet formations of said grooves, which `aids in the upward movement of the sand but retards the downward movement thereof between the plunger and barrel. Thus, by the provision of the grooves36 the leakage of liquid from above the plunger into the pump chamber is not only retarded, but the pump is also mademore eilicient in the pumping of water and oil containing sand, it being well known that the presence of sand is extremely troublesome in ordinary deep well pumps.

In some cases the

inner tubes

20, 23 may be eliminated, using only the

tubes

21, 24, and in other cases both the upper and lower portions of the pump may have three or more tubes, such as for a slow-acting pump.

It is also possible to use the grooves 36 in any of the confronting surfaces of the tubes, or said grooves may be omitted, as seen in Figure 2.

Figure 2 illustrates a more simple construction. The tube a is screw-threaded on the cage 16a of the valve ball or member 15a, and said cage 16a and tube 21a are screwthreaded on the seat member 14a which has the tapered portion 13a fitted in the seat 12a of the liquid inlet member 11a that is screwthreaded on the lower end of the pump barrel 10a. The

tubes

23a, 24a are screw-threaded on the seat member a of the upper check valve which has the valve ball or member 27a. bearing on said seat member 25a, and a cage 23a is screw-threaded on the member 25a. This provides a more simple assembly, and the shoulders 30, 3l, spring 32 and bui fer 33, apertures 34, and grooves 36 are omitted.

Figure 3 illustrates a greater clearance between the outer tube 246 of the plunger and the barrel 106, with collars 366 on the tube 246, to offer resistance to the flow of liquid between the plunger and barrel, the edges of said collars being bevelled as shown. The collars create eddies, so as to create resistance to the flow of liquid between the plunger and barrel, and any number of collars may be used on the tube 246.

Figure 4 illustrates a force pump, such as i may be used at the upper end of the well casing for forcing the liquid to a higher level into a tank. This type of pump may be used for other purposes, however.

The pump barrel 10c has its' lower-end screw-threaded on a coupling member 18o which is screw-threaded within a tubular section 17o. which is in turnv connected by a coupling. member 140 with the upper end of the well casing 37 The member 140 has openings therein around the plunger rod 38, for the upward flow of the liquid, and check valves 15e are seatable in `said openings to prevent the downward How of the liquid. The section 170 has a liquid outlet with a suitable check valve 270 through which the liquid is delivered to the tank or elsewhere. The member 18o has an upstanding annular flange 19a to which the lower ends of the tubes 20c, 210 are screw threaded, andthe upper ends of the tubes 230, 240 are similarly connected, with a head. 250 that is secured to the plunger rod 38, thereby reciprocating the plunger of the force pump similar to the plunger of the lift pump within the Well.

vWhen the rod 38 is raised, the column of liquid in the well casing is lifted so as to lift the liquid past the check valves 15cinto the force pumpand when the pump rod is. moved downwardly, the valves 150 are closed, and the liquid in the pump is forced through the valve 27e. v

The ends ofthe tubes are tapered or bevelled, as at 290, and, as shown, the confronting surfaces of the tube 240 and barrel 100 have the grooves 360 which are of ratchet form but in a position reverse to that shown in Fig. l, toresist the upwardlow of the liquidbetween the plunger and barrel from the pump chamber, this being a force pump. y 1 Any liquid leaking from the pumpchamber and passingabove thel plunger may iiow down throughl the head 250 which has the apertures 39 vfor that purpose, with check valves 40 seating upwardly to close said apertures when the plunger moves downwardly,

the valves or balls 40 being supported in cages 4l carried by the head 250. A Y

Figure 5 shows the grooves 36d with upper and lower square or horizontal walls soy as to beeffective in both the upward and downward movement o-the liquidA between the portions which has lthe grooves.

Having thus described the invention, what is claimed as new is l. A pump comprising a barrel, an eX! pansion and contraction chamber in said barrel including telescoping tubes, and means for the inlet of liquid toand the .outlet thereof from said chamber-,the telescoped ends. of said tubes being bevelled to directV the liquid between the tubes.

2. A pump of the. characterdescribed comprising a barrel, a mounted therein and having a passageway therethrough, and

plunger operatively4 cooperating grooves formed ini thel opposing surfaces of the plunger and barrel to resist the flow of liquid therebetween, each of said grooves having a lower side thereof at right angles to the axis of the plunger and an upper side thereof at y an acute angle tosaid axis. c

3. A pump of the character described comprising a barrel, a plunger operatively mountedtherein and having a liquid passageway therethrough for the upward movement of liquid. from within the barrel, a

-valve for controlling said passageway, and

circumferential .grooves formed in opposing surfaces of the plunger and the barrel to resist the flow of liquid therebetweeineach of said grooves having a lower side thereof at extending at an angle to said lowerV side and at an acute angle to the axis of the sleeve.

In testimony whereof, I hereunto aix my signature.

ALBERT F. RUTHVEN.

right angles to the axis of the plunger and an upper side thereof at an acute angle to 'said axis. 20 v 4. A pump of the character described comprising a barrel, a plunger operatively mounted therein and having a liquid controlling said passageway, a sleeve carried by the plunger in relatively close ii*- ting relation to the barrel, and y grooves formed in both of the opposing surfaces of the sleeve and barrel to resist the flow of liquid therebetween, each of said grooves bey ing V-shaped in cross-section with the lower side thereof at right-angles to the axis of the plunger, and the Y upper side vthereof at an faces of the sleeve and Vbarrel to resist the flow of liquid therebetween, said grooves being arranged in adjoining relation and being V-shaped in cross-section providing a serrated portion in the surface.

6. A pump of the character described comprising a barrel, an p inlet valve for lthe lower rportion of thebarrela plunger operatively mounted within the barrel, and having a liquid passageway therethrough for the upward flow of liquid from within the barrel, a valve forcontrolling saidrpasannular grooves formed in opposing lsurfaces of the sleeve and barrel to resist the flow of liquid therebetween, each of said grooves having the lower 'sides thereof extending approximately at right angles to the axis of the sleeve, and having the upper side pas- 'sageway therethrough for the upward flow of liquid from within the barrel, a valve for sageWay, a sleeve carried-by the plunger in l Vrelatively close fitting relation to the barrel,