US2470888A

US2470888A - Deep well pump

Info

Publication number: US2470888A
Application number: US560787A
Authority: US
Inventors: Charles F Degner
Original assignee: HENRY M UNSEHULD
Current assignee: HENRY M UNSEHULD
Priority date: 1944-10-28
Filing date: 1944-10-28
Publication date: 1949-05-24
Anticipated expiration: 1966-05-24

Description

C. F. DEGNER .May 24, 1949.

DEEP WELL PUMP 3 Sheets-Sheet 1 Filed Oct. 28, 1944 jf zvewrv Charles ZQggrwr: WM, 7% Q2? '5'.

May 24, 1949.

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DEEP WELL IUMP Filed Oct. 28, 1944 s Sheets-Shet :s

IIIIIIIIIII 1 Patented May Z-L 1949 UNITED STATES PATENT OFFICE DEEP WELL'PUMP 'Charles F. Degner, Chicago, 111. assignorof onehalf to Henry M. Unschuld, Chicago, Ill. Application October 2s,1944,sena11-fb.'se0, za7' 6 Claims.

This invention relates to deep well pumps, and more particularly to an improved reciprocating pump unit which is driven mechanically from the top of the well by, rotating the drive shaft.

In most deep well pumps using a reciprocating piston, the piston is operated by a sucker rod which extends upwardly through a pipe line and during the pumping stroke is suspended from a may move six feet, the pumping stroke at the bottom of the well may only be two feet. It has heretofore been proposed to place motor driven pumping units at the bottom of the well, but such construction has not been very satisfactory as the driving motors must be of very small diameter to fit through the ordinary well casing and allow enough space for the liquid to move upwardly. Also, it has been difficult to maintain and service such motors.

The primary object of the present invention is to drive the pumping unit at the bottom ofthe well by means of a drive shaft which may be rotated from the top of the well.

Another object of the invention is to provide a comparatively long pumping stroke which will i2 of Figure 11.

move upwardly under considerable power .and

will return to pumping position rapidlyfor the next working stroke. The invention is illustrated in preferred embodiments in the accompanying drawings, in which:

Figure 1 is a broken vertical sectional view showing the upper end of the pumping mech-'-' anism; Figure 2, a vertical sectional view showing the lower end of the pumping mechanism; Figure 3, a fragmentary sectional view showing one of the guides for the rotary drive shaft in the' at line 8 of Figure 7; Figure 9, a sectional view,

taken as indicated at line 9 of Figure 7; Figure 10, a sectional view, taken as indicated at line ill of Figure 5; Figure -11, a fragmentary elevational view showing a modified type of means for reversing the cross-head; and-Figure 12,- a i'ragmentary sectional view, taken as indicated at line In the embodiment vided with usual well casing i3 in which is mounted a pipe line H provided at its upper end with an outlet pipe i5 and at its lower end with a pump cylinder IS. The pump cylinder is rigidly secured to'the pipe. line against rotation and is provided at its lower end with the usual check valve 11, and below that a screen member l8 which may rest on the bottom of the well.- A hollow piston is is provided with a centrally disposed check valve 20 so that when the piston is reciprocated vertically, liquid is drawn up on the up stroke through the valve 11 and on the down stroke of the piston, the liquid passes through. the valve 20 into-the pump cylinder above the piston.

The top of the piston is provided with a spider 2i which is secured to a yoke 22 by means of a bolt 23. The yoke 22 is suspended from 'a crosshead 24 which is slidably mounted for vertical movement in the pump cylinder l6 between channel-like guides 25.- The cross-head is impaled by a screw shaft 26 which has a screw 21 for drawing the cross-head upwardly and a thread 28 for. permitting downward movement of the piston after it reaches the top of itsstroke.

As best shown inFigure 7, a pair of nuts is threaded to the shaft 26 in the cross-head and is held in spaced relation by a sleeve 29. A lower nut 30 makes driving engagement with the thread 21 and the upper nut 3! makes driving engagement'with the thread 28 which may have a greater amount of lead than the thread 21. This is done because less power is required to return the piston than to lift the column of liquid on the working' stroke. The nuts are held in the cross-head by means of a gland nut 32.

A clutch head 33 is slidably mounted on' the spacing sleeve 29 and is thrown into engagement with one or the other of the nuts 30 or 3i by means of a trigger member 36 which is pivoted to the cross-head at35 and makes a lost motion pin-and-slot connection with stud 36 on the clutch head. A tension spring 3'l' urges the trigger arm by a toggle motion into one or the illustrated, a well is pro- 3 its stroke. Thus, it will be understood that by rotating the shaft 28 constantly in one direction, the cross-head will be moved, by power, up and down and cause the piston l8 to pump.

The screw shaft 26 is provided at its ends with thrust bearings 40 and is coupled to a drive shaft 4| which extends upwardly through the pipe line 14 where it makes a splined connection with bevel gear 42 which may be driven by a bevel gear 43 operated from a suitable source of power. The splined connection at 44 permits the shaft 4| to shrink or expand a certain amount vertically without interfering with the driving connection.

'As best shown in Figures 1 and 4, a series of guide-members 45 are provided along the length of the shaft to prevent its whipping in the pipe line. The guide-members may be made in two parts and secured together by bolts 46. If desired, they may be provided with slots 41 to permit liquid to pass through the shell of the guide, and where the liquid being pumped is oil, some improved lubricating effect is provided.-

In the modification shown in Figures 11 and 12, a double threaded shaft 48 passes through a cross-head 49 which houses a pivotally mounted drive finger 50 which is held on the cross-head by a casing by bolts 52. With this type of driving connection no clutch is required as the crosshead will automatically reverse when it reaches the end of the screw thread and will cause the piston to be returned in the same manner described above.

In operation it will be understood that the power mechanism at the top of the well will cause the drive shaft 4| to rotate constantly in one direction. The screw thread 21 will pull the piston up during its working stroke until it reaches its top position when the driving connection will be transferred to the other screw and the piston will be returned very rapidly to its starting position at the bottom of the cylinder. tioned above, the returning thread 28 may have a different amount of lead (and in the opposite direction) from the screw 27. This will cause the movement to be accelerated. Also, as the shaft 4| is under a greater torsional stress when drawing up the piston, a certain winding effect is built up in the rod and on the return stroke the unwinding of this spring force will also tend to accelerate the downward travel of the piston.

The foregoing detailed description has been given for ciearness of understanding only, and no unnecessary limitations should be understood therefrom for some modifications will be obvious to those skilled in the art.

I claim:

1. In combination, power means, a screw shaft constantly rotated in one direction by said power means, said screw shaft having coextensive right and left screw threads, one of said threads having a greater amount of lead than'the other, a hollow elongated stationary member, a cross-head longitudinally reciprocable but nonrotatable in said stationary member, a pair of axially spaced nuts rotatably mounted in the cross-head but held against axial movement with relation thereto, one of said nuts being in engagement with the thread of lesser lead and the other nut being in engagement with the thread of greater lead, a clutch head axially slidably butnonrotatably mounted in said cross-head between said nuts, a trigger lever pivotally mounted on said cross-head intermediate of its length, one end of said lever being connected to the clutch head and the other end of the lever being free, and a pair of stop members As men-- spaced apart longitudinally of the stationary member whereby when the cross-head approaches one end of its movement the free end of said lever will strike one of said stop members and be moved thereby to shift the clutch head into engagement with one of said nuts to hold it stationary relative to the cross-head for slow movement of the cross-head in the reverse direction,'and when the cross-head approaches the end of its last mentioned movement the free end of the lever will strike the other one of said stops and shift the clutch head into engagement with the other one of said nuts to hold it against rotation with relation to the cross-head for fast movement of the cross-head in the opposite direction.

2. In a pump, power means, a screw shaft mounted for rotation in one direction only by said power. means, said screw shaft having coextensive right and left screw threads, oneof said screw threads having a greater amount of lead than the other, an elongated stationary member, a cross-head longitudinally reciprocable but nonrotatable with relation to said stationary member, a pair of axially spaced nuts rotatably mounted in the cross-head but held against axial movement with relation thereto, one of said nuts having threaded engagement with the thread'of lesser lead of said screw shaft and the other nut having threaded engagement with the thread of greater lead, a sleeve on said screw shaft for holding said nuts apart for independent rotation with relation to each other, a double acting clutch head axially slidable on said sleeve for alternate connection with said nuts, said clutch head having nonrotatable but axially slidable connection with said cross-head, said stationary member having spaced apart stop members, and a lever pivotally connected to said cross-head, one end of said lever having lost-motion connection with the clutch head and the other end of the lever being free whereby as the cross-head reciprocates the free end of the lever will alternately strike said stop members and swing the lever, move the clutch head and alternately stop rotation of one of said nuts with relation to the cross-head so that the pumping stroke of the cross-head will be slow and the return stroke fast.

-3. In a pump, power means, a screw shaft mounted for rotation in one direction only by said power means, said screw shaft having coextensive right and left screw threads, one of said threads having a greater amount of lead than the other, a vertical elongated stationary member having an upper stop member and a lower stop member, a cross-head longitudinally vertically reciprocable but nonrotatable with relation to said stationary member, a first nut rotatable in said cross-head and having threaded engagement with the thread of lesser lead on the screw shaft, a second nut rotatable in the 'cross-head and having threaded engagement with said thread of greater lead, a sleeve on said screw shaft for axially spacing said nuts for independent rotation with relation to each other, the inner end of each of said nuts being formed with clutch teeth, a clutch head axially slidable on said sleeve and having clutch teeth on both ends, a lever pivotally connected to the cross-head and having at one end a lost-motion connection with the clutch head and having its other end free, whereby when the free end of the lever engages the lower' stop member the lever will shift 'the clutch head into clutching engagement with the first nut to cause the cross-head to move upwardly at a slow rate for pumping, and when the free end of the lever engages the upper stop member the lever I will shift the clutch head into cluching engagement with the second nut to cause the crosshead to move downwardly at a fast rate for a quick return.

4. Mechanism as claimed in claim 3, having a coil spring connected at one end to said stationary member, and at its other end to the free end of the lever so that when the spring is on one side of the fulcrum of the lever it will hold the lever in that position until moved by one stop member, and when the spring is on the other side of the lever fulcrum it will hold the lever in that position until moved by the other stop member to prevent inadvertent shifting of the clutch head until shifted by the stop members.

gaging the thread of greater pitch, a double act- .lever alternately strike to alternately cause the clutch head to clutch the first nut and the second nut to move the cross-head slow in pumping direction and fast in return direction.

6. A pump as claimed in claim 5, having spring means for holding the lever from being moved 1 Number with relation to the cross-head until moved by striking one or the other of said stop members.

- CHARLES F. DEGNER.

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

UNITED STATES PATENTS Y I .Date

Humphrey Oct. 28, 1941