US1730297A - Reciprocating pump - Google Patents

Description

A. F. RUTHVEN- REcIrR'ocATING PUMP Oct. 1,1929.-

Filed Febl. 12, 192'? 2 Sheets-Sheet 1 Patented Ott. 1, 1929 UNITED STATES PajrlsyzivrV ori-'lcs y maar r. mrrHvEN, or cLnvELANn, omo

Bnciraocarmo rtm1 application mea February 12,1927. semi no, 167,709.

' 5 tionto provide a reciprocating `pump which elimina-tes leather and other packings, which reduces friction and wear to a minimum, and which is especially suitable for pumping water or oil containing sand. v

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' lms or sheets of liquid between the relatively movable parts, constituting liquid packing, and keeping the metal parts out of contact.v

A further object is to provide a pump embodying telescoping tubular members or sections constitutin the pump chamber, with said members out o contactwith one another to provide liquidspaces 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. l

A still further object is to provide a pump of the character indica-ted comprising a`novel assembly of the Acomponent elements whereby water and oil from deep wells, with a minimum possibility of the pump bein impaired in its operation .bythe presence o sand.

It is also an ob]ect of the invention to improve the pump generally in its construction and details tov enhance the utility and efciency thereof. p l

With the fore oing and other objects in view, which will e 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 c`an be vmade within the scope of what is claimed, without departing from the spirit of the invention.

The invention isillustrated in the accom.

panying drawings, wherein- Figure 1 is avertical section of a deep well ump embodying the improvements, portions being broken away,

the pump is especially suitable for pumping Fig. ;2 is a vertical section of a modiied construction of deep well pump, portions being broken away. f

Fig. 3 is a side elevation of a modified form of plunger, showing the barrel in section.

Fig. 4 is a vertical section of a force pump embodying the improvements, portions being broken away.

Fig. 5 is a sectional detail illustrating a modification in the form of grooves.

Referring to Fig. 1, 10 indicates the usual pump barrel at the lower end of the well casmg, and having attached to its lower end the usual liquid inlet member 11 having a tapered 'y .seat 12 therein in which is seated the 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 16 confining the ball or valve member 15 for movement thereml and is adapted to be lifted through the bairel 10. v 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 screwthreaded or otherwise secured within the upper end of the sleeve 17 and has an upstanding annular flange 19 screw-threaded '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 Apump tubes or sections 23, 24, so as to constitute a pump chamber that may be increased and del creased-in length to produce the pumping action. The upper end of the tube 23 is screw-threaded on a tubular valve seat 25 which has an outstanding annular lange 26 on which the upper end of the tube 24 is screw'- threaded. A ball 27 or other valvemember is seatable on the seat 25 to constitute an upper check valve for'the pump, and a cage 28 is screw-threaded on the seat 25 over the valve member 27 and also provides means for the connection of the lower end of the pump rod (not shown). lThe tubes 23, 24 and upper check valve constitute the plunger of the p pump which is reciprocated vertically.

The tubes 20, 21, 23, 24 are of such diameter as to provide mininfrum clearances between such concentric tubes, and between theoutermost tube 2 4 and the barrel 10, so as to permit said tubes to remain out of contact and V to restrict'as much as possible the flow of liquld 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, it is 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, 2 1 and lower terminals of the tubes 23, 24 are bevelled or tapered, both internally and externall as at 29, in order that when the upper an lower tubes 1aretelescoped together, said terminals of the tubes will divide the liquid which they encounter, thereby directing the li uid be- 29 tween the upper and lower tubes e ectively and distributlng the liquid to the inner and outer sides of the intermediate tubes 21, 23 1 n order to keep t-he tubes out of Contact. This makes the pum free acting without the tubes contacting witi one another, and the pump operates with negligible friction.

. When the plunger is raised the valve member Y27 is seated, so that the liquid above the plunger is lifted, and the um chamber being enlarged will draw llqui through the inlet member 11 and past the valve member 15. i The clearances between the pump tubes being small, as well as the clearance between Cil 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 thevlifting action little or no liquid will be drawn Vfrom 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, which will have a tendency to draw the liquid betweenjthegrtubes, and

. this tendency will eiginend into' the pump chamber as well as above the plunger, thereb creating an/equalizingaction, which inl add-1- tion to the resistance voffered to the/flow of liquid between the tubes,

when the ber to a minimum, especiall lplunger is reciprocated at a su ciently 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 l therefore operates as a lift pump. v

In order to lift the lower portion of the pump with the upperportion or plunger thereof, the tube 20 is formed on the exterior near its upper end,with a shoulderor Collar 30 land 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 will reduce leakage from above the plunger into the pump chamlift the tube 20 and other parts connected thereto so that they may be removed from the well with the plunger. y

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` ends thereof. The end of the tube 24 which contacts with the buffer 33 may be flattened slightly, if desired, for contact with said buHer. i i

' Drain holes 34 are formedin the tube 20 immediatel above the flange 19 in order that sand or ot er sediment dropping between { alht tubes 20, 21 may pass down through said o es, in the member 18 at the lower end of the tube 21 -to permit sand to 'pass downwardly and and drainholes 35 are also providedv thus avoid the accumulation of. sand above said member 18.

Inorder to oer resistance tothe downi ward iow of liquid between the tube 24 and -.barrel 10a-nd to also avoid interference with the operation of the plunger by sand, the eX- l Iterior surface' of the tube 24 and interior surface of the barrel 10 are formed with cooperating grooves 36. These grooves may be either. clrcular or spiral like screw threads, and the grooves may be 1n bands .or zones, .as

shown, or may be arranged otherwise. The

grooves may also extend for anysuitable-disl tance vertically of the tube 24 and barrel. The grooves are of ratchet form with lower substantially horizontal walls clined or bevelled walls. pose of increasing the resistance offered to the liquid flowing downwardly between the plunger and barrel, as well as aiding lin the and upper in- Thisis for the purf eliminationof sand between the plunger andV v barrel. Thu s, tween the plunger and barrel encounters the lower walls of the`grooves, thereby creating liquid flowing downwardly-be-- eddies and otherwise offering resistance to thee,

downward flowlofthe liquid, so as to reduce to a minimum the `.fiow of the liquid from above the valve member'27 into thevpump chamber when the plunger is raised.I However, when the plunger is moved downwardly the grooves 36 ojfer less resistance to the upward fiow of liquid between the plunger and barrel. The grooves 36 also aid indisposing ofisand which may accumulate around the plunger within the barrel, especially after the 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 I 36, inv which the particles of sand may move, and the plunger may thus be started much more readil than with the ordinary pump plunger. T ie plunger is thus freed quickly even though the clearance between the plungupward movement of the sand but retards the downward 'movement thereof between the plunger and barrel. Thus, by the .provision ofthe grooves 36 the leakage of liquid from above the plunger into the pump chamber is not only retarded, but the pump is also made more eiicient in the pumping of water and` oil containing sand, it being well known that the presence of sand is egtremely troublesome in ordinary deep wellpumps.

In some cases the inner tubes 20, 23 may be eliminated, using only the tubes 21, 24, and in other cases boththe upper and lower portions of the pump may have three or more tubes,

t such as for a slow acting pump. l

It is also possible to use the grooves 36 in t surfaces of the tubes, or said Agrooves may) e omitted, as seen in Fig. 2.

Fig. 2 illustrates a more simple construction. The tube 20a isscrew-threaded on the cage 16a of the valve ball or member 15, and

said cage 16- and tube 21a are screw-threaded on the seat member 14a which has the tapered portion 13 fitted in the seat 12a of the liquid inlet member 11a that is screw-threaded on the lowerend of the pump barrel 10". The tubes 23a, 24a are screw-threaded on the seat member 25a of the' upper check valve which has the valve ball or member27a bearing on said seat member 25, and a cage 28a is screwthreaded on the member 25a. i This provides a more simple assembly, andthe shoulders 30, 31, spring 32 andbufer 33, apertures 34, 35 and grooves 36 are omitted. l

. Fig. 3illustrates a greater clearance between the outer tube'24b of the plunger and the barrel 10b, with collars 36" on the tube 24",

to offer resistance to the flow of liquid between the plunger and barrel, the edges of said collars bein bevelled as shown. The collars create ed ies, so as to create resistance to the flow of liquid between the rel, and any number of c ol on the tube 24".

' Fig. 4 illustrates a force pump, such as may be `used at the upper end of the well casing for forcing the liqui to a higher level into a tank. This type of pump may be used for otherv ars may be used purposes, however.

The pumpbarrel 1i()c has its lower end screw-threaded on a coupling member 18c which is screw-threadedwithin a tubular secplunger and barf `tion 17 l whichis in turn connected by a coupling member 14c with the upper end of the well casing 37. l The member 14c has openings therein around the plunger rod 38, for the'upward flow lof the liquid, and check valves 15c are seatable in said openings to prevent the downward flow of the liquid. The section 17" liquid. in the well casing is lifted so as to lift theliquid past the check valves 15c into the force pump, and when the pump rod is moved downwardl the valves 15 are closed, and the liquid in t e pump is forced through the valve 27 c. Y

The ends of the tubes are tapered or bevelled, as at 29C, and,as shown, the confronting surfaces of the tube 24c and barrel 10c have the grooves 36c which are of ratchet form but ina position reverse to. that shownin Fig. 1, Ato resist the upward flow of the li uid between the plunger and barrel from the pump chamber, this being a force pump. Any liquid leaking fromthe pump chamdown through the head 25 which has the When the rod 38 is raised, the column of` ber and passing above the plunger' may flow' apertures 39 for that purpose, with check valves 40 seating upwardly to close said apertures whenthe plunger moves down;

wardly, thel` valvesor balls 40 being supported in cages 41 carried by the head 25.

Fig. 5 shows the grooves 36d with upper land lower. square or horizontal walls so asv to be effective in both the upwardl and downward movement of the liquid between the portions which has the grooves. Having thus described the invention, what is claimed as new is 1.- A pump comprising a barrel, an expansion and contraction chamber in said barrel including telescoping tubes, and means for w the inlet of liquid to and the outlet thereof from said chamber, the telescoped ends of said tubes being bevelled to directv the liquid between the tubes. f

'2. A pump comprisinga barrel, an inlet member attached to the lower end thereof, a valve seat seated in saidf inlet. member, a' check valve seatable on saidl seat, a sleeve secured to and upstanding from? said Vvalve seat, an

annular member fsecured on 'said sleeve, a

plunger workingin the barrel abovey the sleeve, upstanding and depending telescopv ing* tubescarriemby said annular member and plunger, respectively, and a check valve carried by the plunger.

3. A pump according to claim 2 wherein the annular member has drain openings.

4. A pump according to claim 2, in combination with an annular cushion seatin on said annular member for the contact o the plunger.

5. A pump comprising a barrel, an inlet member. attached to the lower end thereof, a valve seat seated in said inlet member and adapted to be lifted through the barrel, a plurality of concentric upstanding tubes connected with said valve seat as a unit therewith, a check valve seatable on said seat, a plunger working in the barrel'and having a plurality of depending tubes having a telescopic relation with said upstanding. tubes,

and a check valve carried by the plunger.

6. A pump comprising a vertical barrel, a lower inlet member therefor, a plurality of concentric upstanding tubes connected with said inlet member, a check valve to prevent downward iow through said inlet member, a plunger working in the barrel and havinga plurality of depending'tubes having a telescopic relation with said upstanding tubes, and acheck valve for the plunger to prevent downward flow therethrough, the Outer tube of said plunger being close to the inner surface of the barrel, and th'e confronting surfaces of the barrel andlast named tube being formed with cooperable portions to resist downward iiow of liquid between the plunger and barrel and to receive sand.

l 7 A pump'comprising a vertical barrel, a lower inlet member therefor, a plurality of concentric upstanding tubes connected with said inlet member, a check valve to preventdownward flow through said inlet member, a plunger working in the barrel and having a plurality of depending tubes having a telescopic relation with said upstanding tubes,

and a check valve for the plunger to prevent i downward flow therethrough, the outer tube of said plunger being close to the inner surface of the barrel, the confronting Surfaces of the barrel and last named tube being formed with cooperable grooves to resist the downward flow of liquid between the plunger and barrel and to receive sand.

In testimony whereof I-hereunto affix my l signature.

Y A. r. RUTHVEN.

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