US1867906A - Double-action pump - Google Patents

Description

July 19, 1932. M. A. CLARK DOUBLE ACTION PUMP Filed March 1, 1932 2 Sheets-Sheet 1 INVENTOR 5 MA.CLL1-1 BY 9'3 ATTORNEY M. A. CLARK DOUBLE ACTION PUMP July 19, 1932.

Filed March 1, 1932 2 Sheets-Shee MAQQZZ BY Qua? m ATTORNEY Patented July 19, 1932 PATENT ()FFICE MARION A. CLARK, OF TULARE, CALIFORNIA DOUBLE-ACTION PUMP Application filed March 1,

This invention relates to pumps of the plunger or piston type for submergence in the water in a well. My principal object is to provide a double action pump of this character whose operation is controlled hydraulically from a mechanism disposed above the ground level, so that the pump may be suspended solely from the pipes leading to the surface and there is no underwater mechanism requiring lubrication and likely to get out of order. i

A further object is to provide a pump in which a single valve unit is all that is necessary to control the flow of water to and from the opposed double acting cylinders of the pump, and such valve is of a type which does not tend to stick or hang open or otherwise give trouble. The pump may be used practically at any depthv depending on the power 26 of the surface control mechanism without any complication of operation and construction being necessary by reason of any increase in the depth of position of the pump. I

A further object of the invention is to produce a simple and inexpensive device and yet one which'will be exceedingly effective for the purpose for which it i designed.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of ref erence indicate corresponding parts in the several views:

Fig. 1 i a side view of the pump as in operation in a well showing the surface control mechanism diagrammatically.

Fig. 2 is a sectional. elevation of the pump with the parts at the beginning of 'a pumping stroke.

Fig. 3 is a similar view taken on the line 3-3 of Fig. 2 showing the parts after the start of said stroke.

w Fig. 4 is an enlarged sectional plan on the line i -40f Fig. 2.

Fig.- 5 is a cross ection of the upper cylinder head to show the discharge passage therein.

Referring now more particularly to the characters of reference on the drawings, the

1932. Serial No. 596,035.

numeral 1 denotes a centrally located valve and passage block, from which upper and lower cylinders 2 and 3 of the same length pro ect, these cylinders being capped on their outer ends by heads 4 and5respectively. The block is provided with a centrally disposed bore forming a valve chamber 6, open to both ends of the block. Tubes 7 are secured to and project from ends of the chamber into the cylinders 2 and 3 a certain distance and form a continuation of said chamber. Double- cup pistons 8 and 9 are slidable in the cylinders 2 and 3 respectively. These are attached to sleeves 10 which surround the tubes 7 in clearance relation thereto and engage cup pistons 11 at the outer ends of the tubes so as to have a watertight fit therewith.

The adjacent ends of the sleeves are connected-by rods 12 slidably projecting through and guided in the block so that the pistons are tied together. The piston unit is arranged so that when the upper piston 8 is at the bottom of its stroke in the cylinder 2, it is adjacent the upper end of the upper tube 7 andthe upper sleeve 10 is adjacent the top of the block. At the same time the lower piston. 9 is at the bottom of its stroke and the upper end of. the corresponding sleeve 10 is close to the cup in the lower tube 7. When at the outer limit of their stroke the piston cushioning cups 13 mounted in the pistons engage tapered sockets in the cylinder heads so as to absorb shocks. 7

A passage 14 leads from one sideofthe chamber6 intermediate its ends to the top of the block outwardly of the cylinder 2 and is connected with a conduit 15 extending upwardly to the head 4, where it is connected with the interior of the cylinder 2 by a passage 16 in said head. Similarly another passage 17 in the block leads from one side of the chamber 6 some distance above the point of communication of the passage '14 to the bottom of the block 1 outwardly of the cylinder 3. Said passage 17 there communicates with a conduit 18 which leads to the lower head 5 and communicates with the interior of the cylinder 3 by a passage 19 in said head.

Communicating with the chamber 6 between the passages 14 and 17 is an outward passage 20. This extends upwardly in the block to the top of the same outwardly of the cylinder 2, and is connected to a conduit 21 which extends upwardly to the head 4. The upper end of the conduit 21 communicates with an upstanding discharge pipe 22 from which the pump is suspended by means of a passage 23 in the head.-

Intake ports 24 and 25 are cut through the walls of the chamber below the passage 14 and above the passage 17 respectively. These communicate with the surrounding water in the well in which the pump is submerged by openings 26 in the sides of the cylinders adjacent the block, and by openings leading lengthwise in the block inside the cylinders to. said ports, as shown in Fig. 1.

Slidable in the chamber 6 is a piston valve comprising a central stem 27 on which upper and lower pairs of spaced and oppositely disposed plunger cups 28 and 29 are mounted. The valve is limited in its movement in either direction by orificed stop discs 30 projecting across the chamber. The valve cups are so arranged relative to the different passages and ports which terminate in the chamber wall that when the valve is in its lowest position the intake 24 is shut off from passage 14 by the upper cup 29 and the passages 14 and 20 are in communication with each other between the adjacent cups of the upper and lower pairs. At the same time the intake 25 is in communication with the passage 17 between the cups 28. When the valve is shifted to its upward limit of movement a similar butreverse matching-of the passages i obtained.

Communicating with the chamber 6 above and below the stops 30 are feed Water passages 31 both extending to the top of the block outwardly of the cylinder 2 and there connected to conduits 32 extending between the block and the head 4. Here communication is established by passages 33 in the head with the main water feed pipes 34- which extend to the top of the well. It may here be remarked that as far as the operation of the pump ls-COHGGIIlQd the various block passages could project to the sides of the block for direct connection with vertical pipes. The arrangement shown however retains all the pipes within the diameter of the .block 1, so that the entire pump structure is very compact and it can be inserted in a well casing only sufliciently large to clear the block. Also the discharge pipe 22 being centrally connected to the pump the latter is suspended without any tendency to tilt. The various parts are preferably clamped together by studs 35 extending between the block and the cylinder heads.

At the top of the Well the feed pipes '34 are connected to the lower ends of cylinders 36 having plungers 36a therein which are reciprocated in opposite directions by a suitpump as long as able driving mechanism indicated generally at 37. The capacity of each cylinder 36 is not less than the capacity of one of the tubes 7 and the corresponding sleeve 10 when in their fully extended relation.

In operation the water passages of the operating mechanism, comprising the cylinders 36, the pipes 34, the sleeves 10 andll, tubes 7 and chamber 6 below lower cup 29 are completely filled with water which need never be replenished except for any loss through leakage. The completely filled condition may be maintained from a tank 38 associated with and above the cylinders and having checked communication therewith just below the uppermost position of the plungers. Assuming that the operating mechanism is initially positioned so that the plunger of the cylinder 36 Whose pipe 34 is connected to the upper feed passage 31 is at the top of its stroke, of said plunger cause the water to force the valve unit down against the lower stop 30. The upper pump plunger 8 is then at the bottom of its stroke and all the parts are positioned as shown in Fig. 2.

A further pressure feeding of the water due to the continued depression of the operating mechanism plunger causes such water to raise the piston 8. The water in the cylinder above the piston then forces such water out through the passage 16, the conduit 15, the passage 14, the outlet passage 20, and up to the surface through the pipe 22 and communicating passages. A check valve 39 is interposed in the pipe 22 at any point within a certain distance above the pump to prevent return of the water to the cylinder. At the same time the piston 9 0f the lower cylinder is moving away from its head causing water from the well to be drawn into said cylinder below the piston, through the port 25, passage 17, conduit 18 and passage 19 in the head 5. The operating water previously in the tube 7 and sleeve 10 of the lower cylinder is forced back to the corresponding operating cylinder 36, through the lower passage 31 and thecorresponding conduits.

By the time the operating plunger has left the bottom of its stroke the piston '8 is at the top of its stroke. With a reversal of movement of the operating plungers the valve is reversed in position, which places the passage 20 port 24 and'the passage 14 in communication. The movement of the pump pistons and the flow ofwater into and out of the cylinders is thus reversed.

From the above it will be seen that nothing can interfere with the operation of the the operating mechanism is working and such mechanism being fully accessible at all times it can be easily kept in order. There is nothing in the pump to the initial depression and 17 in communication and the stick and give trouble or leak over a long period of use and the only parts which will ever need replacing are the simple and cheap leather cups.

Should the pump pistons become jammed for any reason however, possible damage to the operating mechanism is prevented by bypasses 40 from the bottom of cylinders 36 to the tank, with adjustable safety or relief valves 40a in said conduits opening away from the cylinders.

From the foregoing description it will be readily seen that I have produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described my invention what I claim as new and useful and desire to secure by Letters Patent is:

1. A double action pump comprising opposed cylinders, pistons slidable therein, means connecting the pistons as a unit, a liquid actuated reversible valve directly associated with the pump, a chamber in which said valve is movable, means to pump a liquid into the chamber to move the valve and alternately reverse the same, means whereby the liquid will act to move one of the pistons after it has moved the valve in one direction, an outlet from the chamber, and passage means between the valve chamber and cylinders arranged relative to the valve and outlet so that one piston will be forcing Water through the.

outlet as the other one is on its suction stroke, and vice versa with the reversal of the valve.

2. A double action pump comprising opposed cylinders, pistons slidable therein, means connecting the pistons as a unit, water intake and outlet passages to and from the cylinders, a reversible slide valve to control and allow the water to enter and be discharged from the cylinders alternately as the valve is reversed, a valve chamber means to pump a liquid into the valve chamber on opposite sides of the valve alternately to correspondingly move the valve in opposite directions, and means to cause such liquid, after it has moved the valve, to also move one of I the pistons through a stroke.

3. A structure as in claim 2, in which said .last named means comprises tubes mounted on and communicating with the valve chamber on opposite sides of the valve and extending axially ofthe pistons, and sleeves secured to the pistons and slidably engaging the tubes with a liquid light fit.

4. A double action' pump comprising opposed cylinders, pistons slidable therein,

means connecting the pistons as a unit, water intake'and outlet passages to and from the cylinders, a reversible slide valve to control and allow the water to enter and be discharged from the cylinders alternately as the valve is reversed, a valve chamber, means remote from the pump and connected to the valve chamber to force a liquid under pressure into said chamber on opposite sides of the valve alternately to move the valve in opposite directions, and means whereby such liquid, after the valve has been moved, will also move a corresponding piston through a discharge stroke.

5. A double action pump comprising a block having a central vertical bore forming a valve chamber, cylinders projecting vertically from above and below the block, heads on the outer ends of the cylinders, pistons slidable in the cylinders, tubes secured to the block and forming extensions of the chamber, sleeves secured to the pistons and slidably engaging the tubes, rods connecting the sleeves and extending through the block to tie the sleeves and pistons together as a unit, a slide valve in the chamber arranged for limited movement therein, feed-liquid passages connected to the chamber above and below the valve, means to alternately force liquid through said passages to alternately move the valve in opposite directions and subsequently and alternately force the pistons through their discharge stroke, passages between the heads and the chamher, an outlet from the chamber, a discharge pipe connected to said outlet, and intake passage means between said chamber and the exterior of the pump structure; said passages'and outlet being arranged relative to the valve so that as each piston is being moved on its discharge stroke, the corresponding head passage is in communication With the outlet while the corresponding 1ntake is closed off, and the intake to the other cylinder is in communication with the corresponding head passage while the .outlet is shut off from the same.

6. A double action pump comprislng a block having a central vertical bore forming a valve chamber, cylinders projecting vertically from above and below the block, heads on the outer ends of the cylinders, pisto the block and forming extensions of the chamber, sleeves secured to the pistons and slidably engaging the tube, rods connecting the sleeves and extending through the block to tie the sleeves and pistons together as a unit, a slide valve in the chamber arranged for limited movement therein, feed-liquid passages connected to the chamber above and below the valve, means to alternately force liquid through said passages to alternately tons slidable in'the cylinders, tubes secured move the valve in opposite directions and subsequently and alternately force the pis tons through their discharge stroke, passages between the heads and the chamber, an out let from the chamber, a discharge pipe connected to said outlet, said passages and outlet being arranged relative to the valve so that the cylinder placed in communication with the outlet, and intake passages to the cylinders communicating therewith only during the suction stroke of the pistons.

7. A structure as in claim 6, in which the discharge pipe depends and is connected to the upper cylinder head whereby the pump may be suspended from said pipe; there bein passage means between the pipe and on let outwardly of the uppercylinder.

8. A structure as in clalm 4, in which said liquid forcing means comprises a pair of cylinders, plungers therein, conduits from the cylinders to the valve chamber, and means to reciprocate the pistons in opposite directions simultaneously.

9. A structure as in claim 4, in which said liquid forcing means comprises a pair of cylinders, plungers therein, conduits from the cylinders to the valve chamber, means to reciprocate the pistons in opposite directions simultaneously, and means associated with the cylinders for relieving the liquid pressure therein if an excessive resistance to the flow of the liquid through said conduits is encountered.

10. A structure as in claim 4, in which said liquid forcing means comprises a pair of cylinders, plungers therein, conduits from the cylinders to the valve chamber, means to reciprocate the pistons in opposite directions simultaneously, outlet passages from the bottom of the cylinders, and relief valves in said passages openingaway from the cylinders.

11. A structure as in claim 4, in which said liquid forcing means comprises a pair of cylinders, plungers therein, conduits from the cylinders to the valve chamber, means to reciprocate the pistons in opposite directions slmultaneously, a liquid supply reservoir, bypasses between said conduits and the.

reservoir, relief valves in said bypasses opening away from the cylinders, and intake passes from the reservoir to the cylinders just below the topmost position of the plungers.

In testimony whereof I aflix my signature.

MARION A. CLARK.

head passages are alternately

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