US1805788A - Pump - Google Patents

Description

May 19, 1931.

W. N. SQUIRES PUMP 3 sheets-sheet 2 Filed Sept. 16. 1927 w. N. sQUlREs 1,805,788

May 19, 193.1.

PUMP

Filed Sepf. 16, 1927 :s sheets-sheet 3 d ,IVW wa?, ,Z5 n.. m if,

understood that such embodiment Patented May 19, 1931 PATENT OFFICE UNITED STATES' wrLBUR N. similares, or Jorian,

MISSOURI, ASSIGNOR T0 HYDRAULIC DEEP WJIIILI:

PUMP COMPANY, OF J'OPLIN, MISSOURI, A (.'IORIEORAIIION OF MISSOURI PUMP Application led September 16, 1927. Serial No. 219,922.

in the liquid to be pumped and is operated by reciprocating columns vof liquid preferably but not necessarily contained in two concentric pipes as disclosed in my copend ing application, Serial No. 159,896, iiled January I8, 1927, upon which the present appli. p

cation is an improvement.

, It is highly desirable in pumps of this class which arefadapted to be disposed in Wells so deep that operation by the usual sucker rod is diiiicult, to employ a minimum of piping or a long string 'of pipe other material and to this end it is desirable, to employ the discharge line as a container for one of the operating columns of liquid. Since the pump is disposed at the bottom of from whence it is difficult and expensive to raise it, it is advisable to make it of the minimum number of operating parts and those of such a character that Athey arenot liable to failure or wear to a detrimental extent during the life of the device. Along with the simplicity of operating parts I have aimed to secure simpliiication of structure to the end ot reducing cost of manufacture and rendering th'e device reliable and easy to operate.

To the above ends I have adopted a simplicity of fundamental design in that I employ a motor piston operated positively in 46 alternate directions with a pump plunger operating in one direction totake in the liquid and in the other direction to discharge the liquid. 'In other words the motor piston is double acting andthe pump piston is single acting. Vhile-this is the simplest design and 50 in pumps that may be applied to other designs p it is one whichI prefer, reasons for which will be more apparent later, I do not wish to be limited solely to this design since my invention comprehends certain improvements than that which I have elected here to shoi and describe.

Of the two concentric pipes the inner one preferably communicates with the top of the motor piston to permit pressure in said inner pipe to perform the discharge stroke of the pump, and the outer pipe, or more specifically, the space between the two pipes communi- Cates with the bottom of the motor piston to` permit pressure in said outer pipe to make the suction or intake stroke of the pump, and this column in the space between the pipes is the one which receives the discharge of oil or other liquid on the discharge stroke of the ump.

I prefer to close off the one end of the pump cylinder so that upon the discharge strokerof the pump a vacuum is created in said closed end, but I may open said end of the pump cylinder to the discharge line and by using a motor piston of Alarger area than the pump piston secure the desired force for making the suction stroke of the pump by the diii'erential areas thus provided. This provides a relatively large force Jfor the dis-y charge stroke and less force for the intake stroke which is in accordance withl actual requirements. It is desirable to employ as light' a pressure as possible on the discharge column t'or two reasons, first, because this pressure is imposed directly `on the check valves of the pump and second, because for commercial thickness ot wall the outer tube or conduit is not yinherently as strong to withstand internal pressure as in the inner pipe or conduit merely-because of differenceI in their diameters. Hence while the employment of differential areas of the pump and motor 'pistons would permit me to dispense with the'packing about the piston rod this is not wholly without drawback in deep well operation.

Within the limits of the dimensions available in and within the limitations imposed `by a deep Well, I prefer to employ the packing for keeping the end of the pump cylinder sealed against the rod and permit a vacuum to be drawn in the closed cylinder end during the discharge stroke.'

I employ a packing around the stem or rod leading from said space above the pump piston preferably through the piston so that any gas or liquid which might enter the space will be displaced from such position.

I contemplate also the provision of a discharge passageway from the closed end of the pump cylinder to the outside of the entire pump, this passageway being controlled by a check valve or valves opening outwardly. The space between the piston and the packing i. e. the closed cylinder end may open freely into the outside of the well if so desired to permit idle inflow and outflow of liquid.

In that event the passageway through .the y piston may be'elii'ninated.

A restricted passageway at this point provides an additional function, namely that the upward stroke of the moving pistons and their connecting rod is checked as the stroke nears completion. That is to say, any liquid or gas which is trapped at the upper end of the stroke and discharged through restricted ports provides a cushion.

The same function is desirable for checking the movable system towards the end of the downward stroke and to this end I have provided a liquid check or dash pot for decelerating the moving system as it approaches the end of its downward stroke. This liquid check comprises preferably a short open ended cylinder with restricted dischargel ports adjacent the lower end of the mainI motor cylinder and adapted toreceive a more or less loosely fitting plunger mounted on the rod adjacent the main motor piston the main motor piston approaches the end of its stroke. It is desirable to have the check piston and cylinder of smaller diameter than the main motor piston so that motion in the reverse direction may be started promptly and without developing excessive pressure and also so that the wear at this point will not aect the tightness of the main cylinder and piston.

In this manner I have provided a fluid check for the end of the stroke of the moving system in each direction. Obviously either one or both may be dispensed with, without dispensingwith certain of the other advantages of my invention herein described and claimed.

In a pumping system of this character it is desirable to provide means for permitting the pump and connecting pipes to be pulled invention comprises a telescopic joint in the inner concentric pipe, the telescoping parts over-running or closing drain ports leading from within the inner pipe to the outside of the outer pipe. Obviously within my invention these ports may lead only from the space between the pipes to the outside of the outer pipe since the inner pipe may be drained into the outer by disengaging the telescoping connection. i

Also instead'of ha ing this connection in the inner pipe it m y be contained in the outer pipe. For the sake of simplicity in pulling `the pump .the telescopic or other joint is made in the inner pipeso it may first be withdrawn without the requirement to move or raise the outer pipe.

In the pumping of oil a certain amount of gas is encountered. The gas which is evolved in the well and arises within the casing does not interfere with pumping but the gas which is evolved within the pump or the liquid columns tends first to cause the pump cylinder to become gas bound and second tends to impart to the liquid columns particularly the discharge column an undesired compressibilit-y or elasticity preventing the exertion of full pressure upon the bottom of the motor piston to make the intake stroke. 'Ihe first tendency can be overcome by making the stroke long relative to the bore sol as to gain a very high compression ratio.

The second diiiiculty can be overcome byA a modification herein shown wherein a differential motor piston is employed` so that the force upon the bottom area of the motor piston structure may be made ample to overcome. the force upon the upper face of the motor pistonstructure even if only a low pressure is exerted through the discharge column. Thus if so much gas is contained in the discharge column as to render it quite compressible thev pump may still be operated without requiring an excessively large jack cvlinder for that column. In fact by selection of the proper areas the jack cylinder for the discharge column may be entirely eliminated and the reciprocation of the wider column solely employed tooperate the pump.

In addition to the above features of novelty numerous improvements in details of construction are embodied in the form of pumps which are herein illustrated and described. I do not intend to be limited to these details except as they are recited in the appended claims.

Now in order'to acquaint those skilled in the art with the manner of constructing and operating my invention, I shall describe in connection with the accompanying drawings a few specific embodiments of the same.

ln the drawings:

Fig. 1 is al longitudinal Vertical section through a pump embodying my invention; l

Fig. 2 is a section taken ,at right angles to Fig. 1 on the line 2-2 showing the upper part of the pump in section;

' Fig. 3 is a View taken on line 3--3l of Fig. 1

1 showing the lower part of the pump in section;

Fig. 4 is a cross sectional View of a modified form of the invention; Fig. 5 is a cross section taken on the line 5 5 of Fig. 1;

Fig. 6 is a section taken on the line 6-6 of Fig. 1;

Fig. 7 is Ya section taken on the line 7'-7 of Fig.'1;

Fig. 8 is a cross section taken on the line 8-8 of Fig. 1;

Fig. 9 is a cross section taken on the line 9-9 of Fig. 2;

Fig. 10 is a cross section taken on the line 10-10 of Fig. 2.

Fig. 11 is a cross section taken on line 11-11 of Fig. 2.

Fig. 12 is a long1tudinal section of' avmodi` lied form of thepump shown in Figs. 1 to 11, inclusive.

Fig. 13 is a cross sectional view taken on line 173-13 of Fig. 12.

14 is a diagram of a modified form of the pump shown in Figs. 1 to 11, inclusive, and

Fig. 15 is a similar diagram of a like modified form of the pump lshown in Figs. 12

and 13.

- These respectiveI sections being taken and viewed in the direction indicated by the arrows accompanying the section lines.

The pump of my invention is adapted to be submerged in the liquid to be pumped and it is connected to jack or pulsator mechanism by means of the discharge pipe line 11 and the inner pipe line 12. These two pipe lines are connected to a mechanism for reciprocat-l ing the columns of l1qu1d whlch are contained within the respective pipes, as is explained in my prior copending application and in my copending application, Serial No. 220,728, filed Sept. 20, 1927, which I have recently developed. The body of the pump 13 is suspended on the end of the' outer pipe 11. The body of the pump is made up of two main units, the upper onel for the motor mechanisrn, and the lower one for vthe pump mechanism.y The shell of the pump is made of two sections'of seamless steel tubing 14 and l15.

The upper section 14 'isshrunk upon a semi-l steel cylinder casting 16, having the cylindrical bore 18 and being grooved 'or fluted to provide' four longitudinal passageways between the wall of the tubing 14 and the wall of the cylinder castingY 16. The ridges or lands which run longitudinally of the cylin- Iwithin the tube 14. The upper end of the tube 14 is reduced and threaded as indicated at 19 for connection to a coupling 20, which has a threaded portion 21 cooperating with the threaded portion 19 and has an inwardly extending flange 22 forming a shoulder for engaging the flange 23 of the drain flange fitting 24. The drain ange fitting24 has a stud or telescoping member 25 adapted to cooperate with another fitting which l term the drain flange cap 26, said member 26 having a depending skirt or flange 27 telescoping with the portion 25` of the drain flange member 24. rll`he lower edge of the skirt or telescoping member l27 is flared outwardly to assist in guiding these parts into telescoping relation. rlhe member 26 is provided with a shoulder which is grooved to receive a ring of hard Babbitt metal 28 which seats flat upon the top or end surface of the member 25 to form a tight closure between the bore 30 of the member 26 and the bore 31 of the member 24.

The drain flange member 24fhas longitudinal passageways 32 extending therethrough f `ways 33 communicating with radial drill holes 34 extending out through the webs or lands on the wall of the cylinder 1,6 to provide drain passageways normally closed by the seating of the shoulder 28 upon the end 29.

The upper surface 29 is provided with a series of circular ridges, such as would be made by ashallow'cut with a threading tool, the surface of the ring of Babbitt metal 28 being flat. This arrangement of circular grooves provides a form of labyrinth packing, the ridges of the one surface ten ing to bite into the face of the other surface. The column of pipe 12 rests upon the member 26 and it in turn rests upon the drain flange lnember 24 so/that the two parts are held together under great pressure.

rlhe pipe 12 is connected to the drain ycap vfitting 26 by means of a threaded pipe couflange member 24 upon the end of the cy]- inder is in turn connected to the external pipe line 11 through a reducing coupling 36.

The drain flange member 24 is held in register with the upper end of the cylinder 16 through the use of dowel pins 37, 37 (see Fig. 10). Preferably a thin copper gasket is interposed ,between the member 24 and the upper end of the cylinder- 16 to maintain a tight joint between these parts.

The flange 23 has four perforations 38 registering with the grooves 39 or the longitudinal passageways formed by these grooves with the wall of the member 14.

The lower end of the steel tube 14 is counterbored as indicated at 40 to receive the cushion cylinder member 41. The lower end of the counterbored portion 40 is internally threaded asv indicated at 42 and this threaded portion cooperates with the corresponding reduced threaded portion 43 formingv the upper end of the tube 15. The tube 15 has a cylinder member 44 therein, this cylinder member also having grooves such as 45 along the sides of the same forming fluid passageways. The cylinder member 44 is likewise machined off on its peripheral surface and pressed into place or securedin place by shrinking, as described previously in connection with the cylinder member 16.

Preferably the ends of the cylinders 44 and 16' where they are required to make tight joints, namely at the upper end ofthe cylinder 16 and `at the lower end of the cylinder 44 are brazed or otherwise integrally united to the corresponding cylinder walls of the tubes 14 and 15 to provide tight gasket seats and gaskets are employed at these points.

The lower end of the tube 15 has a reduced threaded portion 46 to which is threaded the upper end of the valve cage holder member 47.

The cushion cylinder member 41 comprises a small cylinder member 48 having a cylindrical bore, the mount or upper edge of the cylinder 48 being notched away to provide free passageway from the chamber formed in the counterborev 40 into the lower end of the cylinder member 16 leaving only the-posts 49 extending upwardly lin contact with the lower end of the cylinder member 16. Thus itcan be seen that the chamber formed in the counterbore 40 communicates with the interior of the lower end of the cylinder 16 below the motor piston therein and communicates also with the space between the pipes 11 and 12 through the passageways 39 externally of the motor cylinder 16 but within the shell of the pump formed at this point by the tubing 14. v

The motor piston 50 fits tight in the bore 18. It is stopped in its motion yupwardly by the shoulder which is formed between the bore 31 and the bore 18 of the cylinder. It is to be observed that the bores 30 and 31 are of the same size, and they are both smaller than the bore 18 or the bore of the pipe 12. At its lower end the piston 50 has an extension 51 to which is-connected the cushion piston and coupling member 52, this piston 52 being threaded internally to receive the upper threaded end of the connecting rod 53.

The piston 52 fits fairly closely within thel connected parts. A rod 53 passes down through the body of the member 41 and through a bushing 55 of anti-friction metal which maintains a substantially tight joint with the piston rod 53. The bushing 55 is preferably made of bronze Or other anti-friction metal. It has a flange 56 secured to the bottom of the wall 57 in which the body thereof is seated. The member 41 has a chamber 58 therein communicating with the upper cylinder portion 48 and the chamber 58 communicates with the exterior through restricted passageways or ports 59, which control the rate at which liquid'is driven out of the cylinder 48 by the check piston 52.

The member 41 has a cylindrical flange or barrel 60 formed integral with the wall 57, the lower edge of this circular flange or barrel being adapted to seat upon the end 43 of the lower tube member 15. A series of four posts 61 extend inwardly from the circular flange or wall 60 and'they seat upon the lands or ridges formed on the interior of the lower cylindermember 44. The member 41 is preferably heldin place as by dowel pins '62, v

shown in Fig. 6. Now it will" be seen that the passageways formed by the grooves 45 along the lower cylinder 44 communicate with the chamber in the counterbore 40 through the spaces between the lower wall 57 of the member 41 and the circular barrel or flange 60, as indicated at 63.

The upper end of the pump cylinder 44 is counterbored to form a shoulder asindicated at 64 in Fig. 1, a bronze piston rodv guide 65 being seated in the bore 66 of the pump cylinder 44 and having its head seating against the shoulder 64. Suitable pack-` ing 67 is seated in the counterbore and is maintained in place by the gland 68, the lower able metallic packing rings. The pump pis- L ton 70, as shown in Fig. 1, has a longitudinal bore 71 therethrough, the lower end of the bore terminating in a valve seat 72, normally closed by a spring held check valve 73 of the poppet type. The valve 73 has a stem 74 guided in the cap or cage 75, vwhich cap or cage is threaded to the lower end of the piston 70. The cap or lcage 75 has a series of passageways therethrough to permit fluid jpl escaping through the bore 71 and past the valve 73 to'pass below the piston and the cage 75. The upper end of the bore 71 is closed by the rod 53 but the bore 71 communic'ates with radialA drill holes or passageways 76 communicating in turn with longitudinal drill holes or passageways 77 leading to the top ot the piston 70 and thereby communieating-at all times with the closed end of the. cylinder 44. The purpose of the passageways 77, 76, 71 and the valve 73 is to permit the escape of any fluid which enters the closed end of the cylinder 44 to escape on the upward or suction stroke of the pump, as will be explained morein detail later.

. The lower end of the pump section above described has a valve cage 78 secured thereto by means of the valve cage holder 47, previously referred to. This member 78 contains the discharge check valves 79, 79 which are hard steel balls. Below the discharge check valve cage member 78.is mounted' the inlet check valve cage 80' containing the intake check valve which is a hardened steel ball 81. The intakevalve cage 80 comprises a tubular member 82 having a flange 83 at the upper end thereof, which fits within the holder 47,

inglflange 84 cooperating with the flange 83.

said holder 47 having an inwardly extendardened seat'member 85 ispressed intoa counterbore in the intake valve cage member 80 and the upper end of the intake'valvecage 82 fits against the lowerend of the discharge valve cage 78 and is held in engagment therewithwith afluid tight fit through the medium of the holder 47. Likewise the upper end of the cage member 78 is held fluid tight against' the lower end of the cylinder and shell members 44 and 15.

The upper end of the bore 86 of the intake valye cage above the seat 85 is enlarged to vprovide a communicating passageway between two sets of longitudinal passageways in the member 78. The cage member 78 has a central circularopening 87 therein, as can be seen in Figs. 1 and 7. This opening 87 communicates with two circular passageways 88, 88 which extend down to the chamber 89 formed above the inlet check valve 81. f

Thedischarge check valves 79, 79 are housed in chambers 90, 90 formed in the lower end of themember 78, these chambersv communicating at their upper ends with the passageways 91, 914 which extend up into corrif munication with the passageways formed by `the grooves 45 leading up to the chamber in the counterbore 40.-

The chambers 90, 90 below the check valves 79, 79 are closed by the hardened steel seat members 92, 92 which are threaded into the bottom of the chambers 90 and which have passageways communicating'with the chamber 89. Thus it will be seen that when the "piston is raised suction will be created in the lower end of the cylinder 44 and fluid will v be drawn up through the bore 86 raising the check valve 81 passing into the chamber 89, then up through the passageways 88, the central passageway 87 and into the lower end of the ,pump cylinder. Upon downward motion .of the piston 70 thereafter the check Valve v'81 is seated against itsseat 85 and liquid is i discharged from the lower end of the cylinder 44 through the central opening 87 to the passageways 88 into the chamber 89, thence up through they valve seat members 92 raising the check valve 79, through the chambers 90, up through the passageways 91, and thence up through the passageways formed by the grooves 45 inter-communicating with the reciprocating the motor .piston 50 and whichy is provided with a suitable let-0E valve for letting 0H from the column in the pipe 11 the liquid discharged at each discharge stroke of the pump.

When pressure is applied to the pipe 12 pressure on the pipe 11 is released. Thereby the piston 50. is forced down in the cylinder 16 thrusting the rod 53 and the pumppiston 7() downwardly. Downward motion of the piston 70 evacuates the space in the upper end of the pump piston 44 below the packing 67 and discharges liquid through the connections previously described into the discharge pipe 11.

.As the piston 50 approaches the lower end of its stroke the check piston 52 enters the cylinder 48 and traps therein and in the chamber 58 a part of the liquid, thereby deceleratingthe motion of the moving parts to prevent pounding. The liquid which is thus trapped is forced out through the restricted openings 59. The liquid which is forced out by the piston 50 in its downward motion goes up through the passageways 39, as above described, to the discharge pipe 11 and joining the discharge from the pump cylinder.

When pressure isreleased on the pipe 12 pressure is applied by the head mechanism to the pipe 11. Since the discharge check valve 79 intervenes, this pressure cannot be imposed upon the lower end of the piston 70, but is imposed upon the lower end of the piston 50 and the piston 50 is thereby forced upwardly. Thus the suction stroke of the piston 70 is performed, drawing in liquid from the well through the bore 86 passing by check valve 81 and up into the pum cylinder. Any gas or liquid which'haslea ed into the closed end sageway being controlled by suitable valve check 96 permitting the passage of liquid and gases outwardly, but preventing inflow of the same. 1t is also to be understood that free passageway between the interior of the closed end of the cylinder 44 and the exterior of the pump may be provided for dow of' fluids in both directions within the scope of my invention. Y

1f it is desired to raise the pump from the well the central pipe line 12 is first pulled upwardly to disengage the telescoping parts 27 and 25. Raising of the part 26 above the part 24 first `opens the drain passageways 32 from the inside of the pipe 12 to the edge of the pump and thereafter disengagement of the parts 24 and 26 permits the liquid. on the outside of the pipe 12 likewise to drain to the exterior of the pump. Thus the pump may be pulled without being required to lift .the liquid in the pipes 11 and 12.

lVhere considerable gas is encountered it may be desirable to provide the differential motor piston structure shown in Figs. 12 and 13. In this structure an additional cylinder is interposed between the main motor cylinder 16 and the drain flange member 24 with its coupling 20.

A section of steel tubing 100 has a fluted cylinder member 101 pressed thereunto as previously explained and the ends are brazed to provide tight gasket seats. The flutes 102 form passageways communicating with passageways 39 below and passageways 38 above. The bore 103 of the cylinder 101 is smaller in diameter (for example 2) than the bore 18 (for example 2%) of cylinder 16 to proi vide the desired differential area. The diameter of cylinder bore 18 may be made larger if desired.

A piston 104 fits the bore 103 and it is joined by a rod 105 to the piston 50 in bore 18.

The steel tube 100 is counterbored and threaded as indicated at 106 to ,thread upon the threaded part 19 of tube section 14. Likewise the upper end is reduced and threaded as indicated at 107 to cooperate with the threaded part 21 of coupling 20.

. The space between the pistons 104 and 50 is dead space. As such it is subjected to contraction and expansion by the movement of .the piston structure. Preferably but not necessarily I prgvide a relief connection for discharging any fiuid which may enter as by` means of a longitudinalpassage 108 extending by way of radial drill holes 109 from said space down to the valve 73. Since both spaces namely the space between the two pistons 50X and 104 and the space above piston 70 are contracted and expanded simultaneously fluid will be expelled from both. Obviously said space between pistons 50 and 104 could be drained by a check valve passageway such as 95 through the side walls of the pump as shown in Fig. 4 or by an open passageway to the outside of the pump.

The operation of this form of the Apump is apparent from the explanation heretofore made.

As heretofore stated instead of closing the upper end of the pump cylinder to prevent pressure of the discharge column from being exerted on top of the pumppiston, 1 may open said upper end of the pump cylinder and leg providing a differential area between the top surface of the pump piston and the bottom surface of the motor piston the suction stroke may be made. This construction may be employed in the form of pump shown in Figs. 1 to 11, by merely omitting the packing closing the upper end of the pump cylinder and increasing the diameter of the motor piston as indicated diagrammatically in F ig. 14.

Likewise the pump shown in Figs. 12 and 13 may be arranged for differential o peration by omitting the packing for the upper end of the pump cylinder 44 and providing differential areas between the pump piston and the motor piston 50 as indicated in Fig. 15. The drain passage 108-109 and check valve 7 3 are not affected and remain the same. Otherwise the details of construction are net altered.

1 do not intend to limit my invention to the details shown and described except as theyv are recited in the appended claims.

l claim:

1. 1n combination, a motor cylinder, a double acting piston therein, a pump cylinder, a piston therein, a rod connecting the pistons, means to apply pressure alternately to opposite sides of the motor piston, and means for checking the motion of the moving parts at each end of their stroke, said means comprising chamberswithin which the pistons move, said chambers having restricted outlets and means for trapping fluid in saidl chambers during the corresponding strokes.

2. 1n' combination, a mechanism comprising a motor` cylinder having a piston, means for applying pressure alternately to opposite sides of the piston, a pump cylinder having a piston, a rod connecting the pistons, means providing a tight joint between the rod and one end of the pump cylinder, a discharge passage way leading from the other end of the pump cylinder into communication with the lower side of the motor piston, a passageway extending from the closed end of the pump cylinder to the outside of the mechanism, and a check valve controlling said last named passageway, said check valve permitting fluid to pass from the closed end of the pump cylinder.

3. 1n a pump of the'class described, the colnbination Aof a motor cylinder, a piston therein, a pump cylinder, a piston therein, said pistons being of different areas and being connected together, a passageway leading lllO to the upper end of the motor cylinder, a discharge passageway leading into the lower `end of the motor cylinder and to the upper end of the pump cylinder, the lower end of the pump cylinder having intake and discharge check valves and said end of the pump l cylinder communicating with the discharge passageway through the discharge check valve.

, 4. In a pump of the class described, the combination of a pump cylinder, a first motor cylinder and a second'motor cylinder all in alinement, the second motor Acylinder being of a diameter smaller than the diameter of the first motor cylinder, said motor cylinders being joined en d to end, connected pistons in saidfcylinder-s, the pump cylinder having an inlet and a discharge check valve, a discharge pipe communicating lwith the discharge valve `1nd with the lower end of the first motor cylinder, and a second pipe communicating with the upper end of the second cylinder.

5. In combination, an outer pipe, a fitting secured to the lower end of the outer pipe, said fitting providing a cylindrical flange extending upwardly substantially axial of said pipe, a` port including a portion extending longitudinally through said flange, said port opening to the' exterior of the outer pipe, an inner pipe carrying a shoulder adapted to seat over said port and having a flange about said shoulder for embracing the first mentioned ange,

said flanges being separable.

6. In combination, a first tubular sleeve iaving a `counterbore, a fluted cylinder pressed into. the reduced portion of said sleeve, a second tubular sleeve having a luted cylinder pressed into the same `and having a stud adapted to be threaded into the counterbore of the first sleeve.

7. In combination with the elements of claim 6, a motor piston in the first cylinder, a pump piston in the second cylinder, a rod connecting said pistons, al packing disposed about the rod at the end of the second cylinder which is adjacent to the threaded joint, and

- a follower for restraining said packing.

8. Iny combination with the elements of claim 6, a piston in the first cylindermember, a piston in the second cylinder member, a rod connecting the pistons, a checking cylinder in said counterbore, and a piston member adapt- -ed to enter said checking cylinder at one end `of the strokeJoli themotor piston.

9. In combination with the elements of claim 6, of a coupling member threaded to the free end of the first tubular'sleeve, said coupling member having an inwardly extend: ing flange, a telescoping member embraced byJ said flange and having a flange lying under said first flange to hold the telescoping member endwise; in engagement with the adjacent end of the first cylinder member, there being a drain passageway extending longitudinally through the first tubular sleeve, and a second telescoping member cooperating with the first telesco ping member for shutting oil said drain passageway, said second telescoping member having a fluid pressure pipe connected thereto and having a passageway communicating with the upper end of the first cylinder member'.

l0. In combination with elements of claim 6, a sleeve member threaded to the outer end of second tubular sleeve and having an inturned flange, an inlet member having a cylindrical member embraced by the inturned flange, and having an outwardly extending flange in endwise engagement with the inturned flange, said inlet member having a longitudinally extending inlet passageway, an inlet check valve controlling said passageway, a cylindrical valve cage disposed within said sleeve member and held in endwise engagement between the second cylinder member and the inlet member, said valve cage having passageways therethrough communicating with the flutes on the second cylinder member, check valves controlling said passageways and said valve cage having passageways communicating with thelower end f the second cylinder member and extending into communication with said first mentioned passageways below said check valves.

ll. In combination with the elements of claim 6, a valve cage disposed endwise in engagement with the remote end of the second cylinder member and having two pairs of pas sageways therethrough, the first pair communicating at one end with the interior of the said second cylinder member and the second pair communicating with the flutes outside the second cylinder member, check valves in said latter passageway, an'intake member disposed in endwise engagement with the valve cage, said intake member having a longitudinal passageway controlled by an inlet check valve and a threaded sleeve member having los member and the valve cage permanently in endw1se ahgnme'nt wlth the second cylinder vmember, said sleeve member being threaded upon the secondtubular sleeve.

12. In combmation a air of concentric l n pipes, a combmed pump and motor element suspended from the outer pipe, an inner telcscopic member secured to the outer pipe and an outer telescopic member secured t0 the inner pipe and embracing the inner member, said inner telescopic member having a passageway extending to the outside of both pipes and having its inner end'closed by the outer member. 'l

13. In a 4pump of the character described, an outer casing enclosing a motor cylinder, a piston therein, a pump cylinder, a piston therein, a rod connecting said pistons, the' pump cylinder having inlet and discharge passageways communicating with one end thereof, check valves for said passageways, the discharge passageway of the pump cylinder beyond the check valve therefor communicating with one end of the motor cylinder,

a discharge pipe also communicating with said end of the motor cylinder and with the discharg'e passageway, a pipe communicating with the other end of the motor cylinder, said pipes being adapted to be filled with liquid columns to be reciprocated for operating the motor piston, the other end of the pump cylinder being closed to the remainder of said pump and having a passageway leading to the exterior of the'casing. f

14. In a pumping mechanism, a hollow shaft, a fluted hollow7 shaft pressed into said first mentioned shaft, the flutes forming passageways for the passage of fluid, and the innery rshaft also constituting a passageway for Huid, means for reciprocating the fluid in one of the passageways and meansvoperated by the fiuid in both passageways for forcing fluid through the other passageway.

15. A deepwell pump including an outer casing extending to the bottom of a well, a motor piston and a pump piston at the bottom of the casing, means connecting .the two pistons, means for reciprocating the pistons, and

a fluid check within the casing and adjacent one of the pistons for checking the motion of the pistons as they approach one end of the stroke.

16. In 4combination, a pair of hollow shafts i one within the-other, a combined pump and motor element carried by one of said shafts,

said shafts being adapted to contain liquid,

.ing liquid out of said shafts.

17.' In combination, an outer shaft, a fitting secured to the lower end of said shaft, said i itting providing a flange extending upwardly substantially axial of said shaft, a port through said flange, and opening on the exterior of the outer pipe,-and an inner shaftcarrying a shoulder adaptedl to seat over said port to close the same, said port being opened by the relative movement between said shaft. i 18. In a deep well pump, al motor element :itthe bottom of a well, said element compris- -iug'two cylinders of different diameters, the

smaller cylinder opening into and being connected tothe .larger cylinder, a piston in cach cylinder,.a connecting rod between the pistons, two columns of liquid for actuating vso s aid motor element, one of said columns of hquid bearing against one of the pistons and the other columnbearing against the other piston, the two pistons and the walls of the two ,'cyllnders forming a single chamber the i volume of which varies with the different pomoar/ea sitions of the pistons, and apump element controlled by said motor element for pumping liquid into-one of said columns.

19. In a device of the class described, a power cylinder, a differential cylinder, and a pump cylinder all in alignment, a power piston, a dierential piston, and a pump piston connected for joint operation, the power cylinder and differential cylinder communicating with each other at one end, pipes for deiining hydraulic columns connected with the remote ends of the power cylinder and the di'erential cylinder respectively, said pump cylinder having a discharge communicating with one end of the pipes and with the end of the differential cylinder.

20. In a device of the class described, a differential hydraulic motor and a pump con-v nected to said motor, said motor comprising a power cylinder, a/dif'erential cylinder of larger diameter than the power cylinder in endwise alignment with the power cylinder,

ated by the differential motor and having a dischargey communicating with one of said liquid passageways.

21. In a device of the class described, a differential motor, a cylinder for said motor having bores of dili'erent diameter communi-' eating directly with each other and having their opposite ends open, a pump having a movable piston and having a discharge delivering liquid into the open end of the larger bore of the cylinder.

22. In a device of the class described, a dif-l ferential motor comprising two connected pistons of different diameter, a cylinder having communicating bores of different di` ameter for said pistons, an open-ended pump cylinder having its open end adjacent the open end of a motor cylinder and communicating with the bore of larger diameter thereof, apumping piston in the pump cylinder connected with said. motor pistons, said pumping cylinder b-eing provided with a valved discharge communicating with the lopen bore of larger diameter and the passageways for liquid communicating respectively with the bore of smaller diameter than with the bore of larger diameter of the motor cylinder.

23. In a device of the class described, the combination of a first sleeve member, a fluted cylinder member disposed within the same, a second ,sleeve member having a releasable joint with said first sleeve member and having a iuted cylinder member disposed therein, the flutes in both of said cylinders form- 'ing continuous fluid passages, a spacing memilo of the first kcylinder member, a motor piston in the first cylinder member, a pump piston in the second cylinder member, a rod connect- Ving the pistons, said Huid passages communicating with the ends of the motor and the pump cylinders, and means for trapping uid in the checking cylinder, said chec ing cylinder having a restricted outlet.

In witness whereof I hereunto subscribe my name this 12th dav of September, 1927.

' WILBUR N. SQUIRES.

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