US2268544A - Lubricated piston - Google Patents

Description

Jan. 6, 1942.

C, J. COBERLY LUBRICATED PISTON Filed July l0, 1940 HA @f2/5E mec/f, )Cos TER a HAR/W5 Patented haii,

clarence J. calmly, Los Anreles, cam., assign'- v' or to Roko Corporation, Reno, Nev., a corporation of Nevada Application July 1o', 1940, seriaiNo. 344,748

, (Cl. 30s- 6) 12 Claims.

This is a continuation-impart of my copending application Serial No. 221,963, flied July 29,

1938, for Fluid operated pump, to which reference v is hereby made. n A primaryobject of my invention is to .provide a piston adapted to reciprocate in a cylinder in which a fluid is conveyed through the piston to valve orice I1I therein. Secured to the valve` member IBI and projecting upwardly in the the periphery thereof, including means for regulating the pressure at which such iiud is discharged tothe periphery of the piston. I further prefer to utilize a regulating means such that the pressure of the fluid may be maintained below a predetermined maximum value.

A further object of the invention is to provide a novel type of piston having means for lubricating the surface thereof during operation.

Other objects and advantages wllljbe apparent from the following description and drawing, in which:

Fig. 1 is a'vertical sectional view of my invention.

Fig. 2 is a fragmentary sectional view taken on the line 2`r2 of Fig. 1.

Fig. 3 is a cross-sectional view takenson the line 3--6 of Fig. 1.

` In the drawing I show va piston |50 having a cylindrical body |5I, adapted to make a. sliding fit in a bore 93 of a cylinder liner 98, the exl .terior thereof being provided with annular chanlnels |52 receiving piston rings |53 as is well known inthe art. 'Ihe cylindrical body I5! has an upper central bore |54 threadedly receiving the lower end of an upper piston rod I| having a longitudinal passage I therethrough, and has a lower central bore |55 threadedly receiving the upper end of a lower piston rod |32, the ends of the rodsbeing spaced apart by Va chamber |55. Oilset from the axis of the cylindrical body is a valve cylinder |51 which is` closed at its lower end by a lower plug |58 and has at its upper end an upper plug |59 provided with a passage |60 therethrough. Slidably disposed in the valve cylinder |51 is a regulator valve member |6| having a cup-shaped piston |62 within which a compression spring |63 is disposed so as to-engage both the piston and the upper plug |50, and the valve member isV provided with a transverse opening |64 which registers with a port |65communicating betweenT the interior of the valve cylinder |51 and the exterior of the cylindrical |5I. The cylindrical body |5`I is Vprvovided with a transverse opening |66 into which 'is threaded a transverse pin |61 having a. vertical uid passage |68 communicating with a longitudinal iluid passage |66, one end of the transverse pin projecting into the transverse opening |64 of the valve member I6| land having threaded thereon a tubular cap |10' having a transverse opening |64is a conical valve element |12 adapted to seat in the lower end of the valve orifice |11 to close it, the valve member being provided with a passage |13. Y

My piston is designed to permit a flow of operating iiuid under relatively high pressure through the passage to the sliding surfaces of the piston and the liner 96 to lubricate them and to prevent1 foreign materials from lodging therebetween, which is broadly covered in my Patent No. 2,081,220, issued May 25, 1937, the

present construction being an improvement thereon. My invention is of particular utility in connection with a deep well pump. In a deep well installation, such as, `for example, alwell 6500 feet deep, the pressure of the operating fluid maybe as high as 4000 pounds per square inch, whereas in using the piston' I 50 in the pump shown in' my above referred to application Serial No. 221,963, the fluid load on the piston |50 may only be 400 pounds per square inch. Obviously'. if operating fluid under a high pressure, such as 4000 pounds per square inch, is conveyed to the outer surface of the piston, it will either cause excessive leakage lengthwise of the piston or will require an excessive'functional duty to be imposed on the piston rings |53. Consequently. a principal object of my piston design is to provide a pressure reducing means for reducing the pressure of the operating uid to a value approximating the uid load on the piston |50.

In operation, operating fluid under pressure is at all times in the longitudinal'passage I of theupper piston rod ||0 and in the axial passage |35 of thelower piston rod |32, communication therebetween being afforded through thechamber |56 ofthe piston |50. The operating fluid ows through the vertical and longitudinal iluid passages |66 and |69, through vthe'tubular cap |10, and through the orifice |1| into the transverse opening |64.- 'Ihe spring |63 normally exerts a downward force on the valve member |6I, tending to hold it in open position in which the valve element |12 is out of seating engagement with the valve orifice |1|. Operating :duid -then r passes through the passage |13 into'the lower end of the valve cylinder |51, and exerts an upward force on thevalve member |6I tending to move the valve member upwardly against theaction ofA in the the spring |63. and any fluid pressure spring |63 lis set to resist movement of the valve' member |6| until the pressure of the operating iluid rises above a predetermined maximum, such as 500 pounds per square inch. Thus, if the normal pressure on the operating uid is 4000 pounds per square inch, the excess pressure in the valve cylinder |51 below the valve member will move the valve member |6| upwardly until thevalve ing means in the une of said 'passage means adapted to maintain the pressure of iluid passing therethrough below apredetermined maximum regardless of the pressure of iluid at said Source.

4. Ina piston device, the combination of; a

piston adapted to be slidably received in a cylinder, said piston having a central chamber, passage means communicating between said chamber and the periphery of said piston, and a bore therein offset from said central chamber; a piston rod connected to said piston and having a longitudinal passage therethrough communicating with said central chamber, the other end of said passage being adapted to be connected "to a ysource of fluid under pressure; a valve member element |12 is suiiiciently closed so that the spring |63 will balance the pressure of the :fluid in the valve cylinder.y It will thus be understood that this construction operates as a regulator to maintain the pressure of operating fluid owing outwardly through the transverse opening |64 and the port |65 below a predetermined maximum, thuspreventlng excessive leakage of operating iiuld lengthwise of the piston |50, and permitting the use of relatively light frictional contact of the piston rings |53 with the bore 93 of the liner 98.` It will also be understood that this piston construction may be used to advantage in other devices, and I do not intend to be limited to its use in connection with a fluid operated pump. Although I have hereinshown and described a simple and practical embodiment of my invention, I do not intend to be limited to the details of construction disclosed but intend my invention to be accorded the full scope of the following claims.

I claim as my invention: Y

1. In a piston device, the combination of: piston means adapted to be slidablyureceived in a movable in said bore to regulate the flow oi' fluid through said passage; and means in said bore for controlling the movement oi' said valve member to maintain the tluid discharged vfthrough said passage to the periphery of said piston below a predetermined maximum pressure.

5. In a piston device, the combination of: a'

piston adapted to be slidably received in a cylinder, said piston having a central chamber, passage means communicating between said chamber and the periphery of said piston, and a bore therein oil'st from said central chamber; a piston rod connected to said piston and having a longitudinal passage therethrough communicating with said central chamber, the'other end of said passage being adapted to be connected to a source of fluid .under pressure; a tubular valve member movable in said bore to regulate the ow of fluid through said passage; and means in said bore for controllingk the movement of said valve member to maintain the fluid discharged through said passage to the periphery of said piston below .a predetermined maximum pressure, said means including a spring engaging said tubular valve a member and means for adjusting the tensionof said spring.

cylinder; walls forming a passage for conveying a iluid through said pistonmeans to the periphery thereof, said passage also communicating 'with a source of iluid under relatively high pressure; and pressure regulating means in the line of said passage adapted to regulate the discharge of fluid therethrough to the periphery of said piston means at a predetermined pressure regardless ofthe pressure of iiuid in said source of supply.

2. In a pistondevice, the combination of: pis- 6. In a piston device, the combination of piston means adapted to be slidably received in a cylinder, said piston means having a central chamber and passage means communicating bey tween said central'chamber and the outer peton means adapted to be slidably received in a cylinder;- walls forming a passage for conveying a iluid through said piston means to the periphery thereof, said passage also communicating with a source of iuidunder relatively high pressure; and pressure regulating means in the line of said passage adapted to maintain the pressure of uid discharged outwardly from said passage to the periphery of said piston 'means below a sure of fluid at said source.

3. In a piston device', the combination of: pisl ton means adapted to be slidably received in a riphery of said piston means; piston rod means connected to said piston means and having a fluid passage therein communicating with said central chamber, the other end of said uid passage being connected to a `source of fluid under pressure; a metering valve in the line of said passage means and adapted to meter a flow of fluid through said passage means; and means for operating said metering valve in response to iluid pressure in said central cliamberto maintain a uid flow through said lpassage means below a predetermined maximum.

'1. In a piston device,' the combination of: a`

piston adapted to be slidably received in acylinder, said piston having a central chamber and passage means communicating between said central chamber and the outer periphery of said piston, there being an offset borel provided in said f piston parallel'with but oiset from the axis of connected to said piston means and having 'a fluid passage therein communicating with said central chamber, the other end of said uid pasf sage being connected to a source of -fluid undervrelatively,'high pressure; and pressure regulat-- said piston; a piston rod connected to said piston and having a piston 'rod passage therein communicating between said central chamber and a source of supply of uid under pressure; a tubular metering valve in said offset bore and movable to control a iow o1' fluid through said passage means; a valve member carriedby said tubular metering valve and adapted to close said passage means; and means for normally yieldably maintaining said tubular metering valve in a position in which said valve member opens said passage, but movable to close said valve member in response to a rise in fluid press'ure in said passage means.

8. In a piston device, the combination of piston means adapted to be slidably received in a cylinder; walls forming a passage for conveying a fluid through said piston means to the periphery thereof, said passage also communicating with a source of fluid under pressure; valve means in the line of said passage and movable to control the iiow of fluid therethrough from said source to said periphery; retaining means operatively connected to said valve means and adapted to maintain said valve means open when the uid pressure in said passage is below a predetermined maximum; and closure means operatively connected to said valve means for f moving said valve means toward closed position against the action of saidA retaining means so as to throttle said flow when the fluid pressure in said passage exceeds said predetermined maximum. A

9. In' a. piston device, the combinationof: piston means adapted to be slidably received in a. cylinderwalls forming a passage for conveying a fluid through said piston means to the periphery thereof, 'said passage also communicating with a source of uid under pressure;

valve means in the line of said passage and movable to control the iiow fof iiuid therethrough from said source to said periphery; .retaining means operatively connected to said valve means and adapted to maintain said valve means open when the fluid pressure in said passage is below a predeterminedmaximum; closure means of iiuid supplv communicating with 'mid passage; a valve member in the line ofvsaid passage and movable between open and closed `position to throttle a iiow of fluid through said passage; retaining means for normally retaining said valve member in said open position when the pressure of iiuid in said passage remains below a predeoperatively connected to said valve means for moving said valve means toward closed position against the action of said retaining means so as to throttle said iiow when the fluid pressure in said passage exceeds said predetermined maximimi; andmeans for adjusting the predetermined maximum pressure at which said closure means will move said valve means toward closed position.

10. In combination: walls forming a passage adapted to convey fluid under pressure; a source termined maximum; and closure means operating in response to a rise in pressure of said fluid in said passage above said predetermined maximum to move said valve member toward said closed position. y l1. In combination: walls forming a passage adapted to convey uid under pressure; ya source fluid in said passage above said predetermined maximum to move said valve member toward said closed position against the action of said Spring.

1 2. In combination: -walls forming a passage l adapted to convey uid under pressure, said passage having an inlet end and a discharge end; a source of uid supply communicating with said inlet end of said passage; a -valve member in said passage between said inlet and discharge f 'ends and movable between open and closed po- .sitions to throttle a flow of uid through said passage; means fornormally retaining said valve member inopen position so long as the fluid pressure inthe `discharge end of said passage remains below a predetermined maximum; and

, means loperating in response to a rise in uid pressure in said passage above said predetermined maximum to move said Avalve member toward' said closedv position to throttle the flow of uid therethroughI so as, to maintain the fluid pressure in said discharge end of said passage below a predetermined value.

CLARENCE J. COBERLY.

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