US2364550A - Pumping device - Google Patents

Description

Dec. 5, 1944. J. J. PELOUCH PUMPING DEVICE Original Filed May 6, 1938 5 m mm 1 m M 2M 7 E .fi m 1 9 H A w WA 6 M 1 s 7 s o s 2 z os/0w 5 f 4/ M v o m Patented Dec. 5, 1944 UNITED STATES PUMPING DEVICE James, J. Pelouch, Cleveland, Ohio, assignorto The United States Air Compressor Company, a

. corporation of Ohio Original application May 6, 1938, Serial No. 206,409; Divided and this application October 16, 1941, Serial No. 415,291

4 Claims. (01. 103-495) My invention relates to pumping devices and more particularly to pumping devices for pumping fluidfrom a container.

An object of my invention is to provide a pumping device adapted to be mounted over a :container and having an end which may be inserted through an opening in the container for pumping fluid therefrom.

Another object is to provide a pumping device which discharges fluid therefrom upon both reciprocal movements of the pump plunger.

Another object is to provide a pumping device for discharging a substantially balanced flow of fluid from the pumping device during each reciprocal movement of the pump plunger.

Another object is to provide a pumping device in which fluid is drawn inwardly of the device and raised therein to discharge fluid upon the upward movement of the plunger and in which fluid entrapped therein is displaced by the downward movement of the plunger to further discharge the fluid.

Another object is to provide a pumping device for entrapping air liberated from the fluid in the device and for discharging the entrapped air to provide a flow of fluid substantially free of air.

A still further object is to provide an improved pumping device efficient in operation and economical in maintenance.

Another object of my invention is to arrange motor such, for example, as shown in my Patent No. 2,268,898, issued January 6, 1942, for Fluid motor, of which this application is a division. In Figure 1 of the drawing, the reference character l6 represents the side walls of the cylinder of the fluid motor and the reference character represents a casing member constituting one end of the cylinder. The piston which is reciprocally mounted within the cylinder wall It is adapted to operate the pump plunger 19. The casing member 20 has a ledge portion l5 extending therefrom and this alleged portion is adapted to be mounted to a suitable support for supporting the top in proper position relative to the fluid container so that the pump is directed downwardly into the container. The cylinder IE 'of the fluid motor is secured to the ledge I5 by means of screw bolts the. valve of a pump so that it may be readily accessible for inspection and cleaning.

Other objects and a fuller understanding of my invention may be had by referring to the following description and claims, taken in conjunc-v tion with the accompanying drawing, in whichf Figures 1 and 2 are cross-sectional views taken lengthwise and vertically along the longitudinal center of a pump embodying the features of my invention, Figure 1 showing the upper portion of the pump and Figure 2 the lower portion thereof, the two figures comprising the complete pump.

My pump is particularly adapted to be mounted to or mounted over a fluid container having an opening in the top thereof so that the lower end of the pump extends down into the container for the pumping of the fluid therefrom. This method of pumping fluid is especially used when grease or other lubricating fluid is tobe withdrawn from the fluid container and applied to the parts to be lubricated, the fluid after leaving the pumping device passing through a hose attached thereto having a suitable nozzle attached to the end thereof. The pump may be operated by a fluid I9. A cylindrical metal cover H is secured by suitable means to the cylinder wall it to provide good appearing and round outside surface to the fluid motor.

The pump is connected to the casing member 2!) and comprises a connecting nipple portion 2|, a pump cylinder portion 22, a lower extension cylinder portion 23, and a lowermost end portion 24. The plunger M of the pump which is reciprocally operated by the fluid motor extends downwardlyfrom the fluid motor into the central opening or bore of the casing member 20. To secure the upper plunger 19 to a lower pump plunger IE9, there is provided a coupling H35 which secures the adjacent ends of the two plungers together. The coupling M36 is secured at its upper end to the plunger l9 by the illustrated threads and is connected at its lower end to a connecting portion I01 by means of a transverse pin B8. The connecting portion lii'l is threadably joined to the pump plunger its by the illustrated threads. In this manner, the reciprocal movements of the plunger 19 are transmitted to the pump plunger I09.

The plunger I69 is reduced in diameter for a distance intermediate of its ends as is illustrated in.Figures 1 and 2 A sleeve Hil is carried upon and surrounds the plunger Hi3 and is adapted to slide axially of, and relative to, the plunger M39. The space between the interior of the sleeve i ii and the plunger l 09 having the reduced diameter forms a passageway l I2 extending up around the plunger H39 and within the sleeve Ill]. The plunger H39 below the reduced diameter portion at H3 is square or otherwise formed so as to pro Y vide'bearingsurfaces engaging the interior wall of the-sleeve H0 and allows other portions withdrawn from the interior walls of the sleeve Hi! to provide communication between the passageway H2 with the space below the plunger I09. There is an enlarged valve head H4 secured to the bottom end of the plunger I09. This head i it may be integral with the plunger IE9 or may be a bolt or otherwise threadably secured to the plunger M23. The diameter of the valve head I I4 is larger than the inside diameter of the sleeve I I8 so that when the valve head I I4 is drawn upwardly against the sleeve III), the head II acts as a valve to close the lower end of the sleeve I It. When the head H4 is pushed downwardly then there is communication established between the passageway I I2 and the space below the enlarged head II4.

There are openings III in the sleeve IIU positioned adjacent to its upper end. These openings I II are adapted to place the passageway I I2 in communication with the interior of the pump housing and more particularly with the interior of the connecting portion 2I wherein there is a space between the plungers and the interior inside walls of the connecting nipple portion 2I. The sleeve I I slides up and down relative to the plunger I09 but this up and down sliding movement is limited. The downward movement of the plunger I09 relative to the sleeve III causes the shoulder I I! on the bottom of the connecting portion IDI to engage the top of the sleeve H9 and to move the sleeve I I0 downwardly therewith. Upward movement of the plunger IE9 relative to the sleeve I I0 causes the valve head II4 to engage the bottom end of the sleeve IE9 and to raise the sleeve I I0 therewith. Therefore. in the downward movement of the plunger I09, the opened sleeve H0 is merely displaced downwardly in the fluid. In the upward movement of the plunger I69, the valve head II4 closes the end of the sleeve III! and raises the sleeve I!!! which functions as a piston identified generally by the reference character I I19. The length of the plunger I 99 between the shoulder III and the valve head H4 is proportioned relatively to the length of the sleeve IIU, so that there is just sufiicient play therebetween to permit the opening and the closing of the bottom end of the sleeve I!!! as the sleeve II!! is carried up and down within the lower extension cylinder portion 23.

A check valve H9 is positioned within the end portion 24 of the pump housing and is adapted to close the inlet opening H8. The stem of the check valve H9 is slidably carried by supportin arms I29 extending out f om the end portion A spring IZI presses against the bottom of the arm I and resiliently bia es the check va IIS to its closed position. The res liency of the s ring I2I is overcome by the sucki g action of the pump mechanism raising fluid upwardly through the pump housing so hat when fluid is being drawn upwardly through the pump housing the check valve I!9,is opened and so that when fluid is not being drawn upwardly. the check valve II9 prevents the fluid in the pump housin fr m escaping out through the inlet opening H8. .To prevent the drawing in of foreign matter w th the fluid being pumped. there is a screen I22 which extends across the bottom of. and is carried by, the end portion 24 so that fluid may pass through the screen I22 and foreign matter is barred from being withdrawn through the inlet open ng IIB.

The lowermost reciprocal position of the sleeve II 0 and the valve H4 is shown by the dash and dot lines in Figure 2. Since the sleeve. H0 and the valve I I4 extend below the surrounding member 23, in its lowermost position, the valve may be readily inspected and cleaned by threadably removing the lower part 24. The inspection and cleaning become important when heavy lubricants are used as in this case the screen I22 is preferably removed so that the heavy lubricants can flow easily up to the pump. Upon removing the screen the foreign matter is not removed from the lubricant and thus may become lodged between the valve I I4 and the seat in the sleeve I Iii.

Since the plunger I9 moves between the air cylinder and the interior chamber of the pump housing through which fluid flows, it is necessary to provide sealing means in the casing member 20 for separating the compressed air from the fluid being pumped. The sealing means is in the form of chevron seals 81 and 88, positioned tightly against the plunger I9 so that air or fluid does not pass along the reciprocating plunger I9. The chevrons 81 are disposed at an angle in one direction and the chevrons 88 are disposed in the opposite direction, and in this manner forms a more perfect seal. The chevrons 8'I prevent air from escaping down from the air cylinder and the chevrons 88 prevent fluid from escaping upwardly along the plunger I9 through the casing 20. The coil spring 86 held down tightly by the threaded plug constrains the chevrons in good packing position to seal the bottom of the air cylinder. Suitable washer elements are superimposed above and below the chevrons 81 and 38 to hold them in a firm position. To seal the fluid chamber within the pump housing, there is provided additional sealing means. This sealing means is also in the form of chevrons I92 and I04 disposed on both sides of the washer I03 and tightly around the plunger I9. The coil spring I23 tightly presses the chevrons I02 and I04 together so as to provide a good seal around the plunger I9. The bottom end of the coil spring I23 engages the washer I05 which is secured in position by th connecting portion 2I threadably secured to the casing member 20. Should the fluid escape past the chevrons I04, a small inclined opening 83 is provided in the casing member 20 so that such small excess of fluid escaping along the plunger I9 may flow outwardly of the casing member. In the event that fluid escapes past the seal formed by the-chevrons I02 and the washer I03, a small opening 96 is provided at a higher level in the casing member 2!! so that such small excess of fluid escaping along the plunger I9 may flow outwardly of the casing member. Since only minute quantities could escape past the seal only a small portion of fluid will escape through the small openings. The escapement of this small amount of fluid, however. will keep it from working upwardly through the chevrons 81 and 88 into the air cylinder.

It sometimes happens that there is a back pressure upon the fluid within the pump housing such as may be caused by the expansion of fluid within the hose connected to the pump housing when the hose is situated in a hot sun. To provide a safety valve for taking care of such back pressure, a safety plug 99 having a valve I00 is threadably engaged to the casing member 20, and a conduit 91 is provided in the casing member 20 so as to provide communication between the interior bore of the casing 20 with the safety plug 99. The safety valve I00 is resiliently biased closed by the coil spring IIII The tension of the spring II'II is predeterminedly set so that the conduit 91 is normally closed by the valve I99 but when the pressure of the fluid within the con-.

duit 91 is suflicient to overcome the resilient action of the coil spring IIII, then the valve I99 permits the fluid under such pressure to flow out through the openings 98, thus relieving the ex cess pressure.

.An outlet conduit 95 is provided for the discharge of the fluid pumped through the pump housing. The outlet conduit 95 extends from the longitudinal bore of the casing member 20 out through the side of the casing member 20 and into the outlet plug 93 and then upwardly through the outlet hose connection 94. The outlet plug 93 is threadably engaged to the casing member 20 and in turn the outlet hose connection 94 is threadably engaged to the plug 93, the outlet conduit 95 to provide communication between the internal bore of the casing member 20 and the hose attached to the open end of the hose connection 94.

When the pumping device is first started, there may be air mixed with the fluid, which may prevent the pump from building up suflicient pressure to expel the fluid through the discharge opening 95 and the hose connected thereto. To obviate this difliculty, I provide for releasing the fluid and air directly to atmosphere. To provide for venting the air and the first flow of fluid which may contain air, there is provided a vent valve 99 which is in communication with the outlet conduit 95. The valve 99 upon being turned by the rod 89 extending up along side the air cylinder permits a diversion of the air and the fluid in the outlet conduit 95 so as to vent the air. Therefore, when first starting the pumping device, the rod 89 is turned so as to open the valve 99 thereby permitting the air and the first flow of fluid which may contain air to escape out through the opening 9| After the fluid begins to flow free of air, then the valve is operated by turning the rod 89 to close the opening 9i and to cause the fluid to pass out the outlet conduit 95 through the outlet hose connection 94.

In the lower portion of the pump housing and within the pump cylinder portion 22, thereis provided chevron sealing means II6 around the sleeve III). The coil spring II pressing down upon the washer imposed over the chevrons 'IIB provides a good seal between the cylinder portion 22 and the sleeve III), so that fluid passing up through the pump cylinder portion 22 is confined therein.

The pumping device is used to pump fluid from a container and for this purpose the housing is so mounted that the lower portion of the pump housing extends down into the fluid container with the lower end thereof immersed in the fluid. By connecting the air motor with a source of compressed air, the compressed air is supplied to the airmotor so as to reciprocate the pistons I9 and I09 up and down within the boreof the pump housing. The pistons I9 and I99 may be considered differential pistons since the area of the closed sleeve .1 III is larger than the lower end of the plunger or piston I9. Upon the upward movement, the end of the sleeve III'I carried by the plunger I99 is closed by the enlarged head I I4 and the raising of the plunger I99 together with the sleeve IIO sucks fluid up through the inlet opening II8 past the check valve I I9 to within the pump housing. Fluid so sucked inwardly of the pump housing is prevented from flowing back out through the inlet opening IIB by the check valve II 9. After the plunger I99 reaches the extending therethrough so as upper limit of its movement, it thenmoves downwardly, carrying the sleeve II9 withv it. The downward movement of the plunger I09 opens up the bottom of the sleeve III) thereby permitting both the plunger I 99 and sleeve I I0 to move down into the entrapped fluid and to be merely displaced therein, the fluid passing through the passageway I I2. Upon the next-upward movement of the plunger I99 and sleeve I I9, the process is repeated so that more fluid is drawn into the interior of the pump housing to fill it with fluid. When the pump housing is so filled with fluid, then the differential action of the pistons I9 and I09 produces a double pumping action so that fluid is discharged out through the outlet conduit 95 during both of the reciprocal move ments thereof. Upon upward movement of the plunger [99 and the closed sleeve III], fluid is raised by reason of the fact that the closed sleeve III) has a diameter greater than the diameter of the plunger I9 being withdrawn up out of the fluid in the fluid chamber. Therefore, the closed sleeve I III being raised up through the fluid chamber within-the pump housing lifts up the fluid and raises it within the pump housing to cause it to be discharged out through the outlet conduit. The amount of fluid so raised and discharged upon upward movement of the plunger I99 depends upon the cross-sectional area of the closed sleeve II9 (that is the total area formed by the sleeve I I 9 when closed by the valve IM) over and above the cross-sectional area of the plunger I9 being withdrawn from the fluid in the fluid chamber in the housing. Upon downward movement, the bottom end of the sleeve H9- is opened and the sleeve II 0 is therefore carried downwardly without producing a pumping action. Since the plunger 79 which was partially withdrawn from the fluid container Within the pump housing is moved downwardly into the fluid, it displaces some of the fluid causing it to be discharged out through the outlet conduit 95. The amount of fluid discharged by this downward movement of the plunger I9 depends upon the cross-sectional area of the plunger 19 as this determines the amount of the fluid so displacedby the plunger. It is therefore seen that the amount. of the fluid discharged by the pump upon the upward movement is dependent upon the diflerential cross-sectional area of the closed sleeve H9 over and above the cross-sectional area of the plunger I9 and the amount of fluid discharged upon downward movement depends upon the cross-sectional area of the plunger l9 moving downwardly into the fluid. By so proportioning the parts that the cross-sectional area of the closed sleeve III) over and above the cross-sectional area of the plunger I9, is made substantially equal to twice the cross-sectional area of the plunger 19 itself, then the discharge of fluid is adjusted so that substantially the same amount of fluid will be discharged in both the upward and the downward movement of the plunger in the pump housing to give a balanced flow.

Although I have described my invention with a certain degree of particularity, it is understood that the present disclosure has been made only by Way of example and that numerous changes in the details of construction and the combination and arrangement of parts may be resorted to without departing from the spirit and the scope of the invention as hereinafter claimed.

I claim as my invention:

1. A fluid pumping device comprising, in combination, differential cylindrical means having a large cylinder portion and a small cylinder portion arranged substantially in straight alignment with each other, said cylindrical means having an intermediate portion which connects the ad jacent ends of the large and small cylinder portions together, a differential piston having a large and a small piston means connected together and reciprocally mounted in the cylindrical means, said large cylinder portion having an inlet member removably connected thereto communicating with the large piston means, said inlet member having a check valve to admit fluid to the large cylinder portion, said cylindrical means having an outlet in communication with the intermediate portion thereof, said large piston means comprising a sleeve reciprocally mounted in the large cylinder portion, and valve means operatively associated with one end of the sleeve to open and close same for controlling the flow of the fluid therethrough, said small piston means comprising a plunger having substantially one-half the area of the closed sleeve, means for causing the valve means upon one directional movement of the piston means to close the sleeve and draw fluid into the large cylinder portion and expel fluid out through said outlet, and for causing the valve means upon the other directional movement of the piston means to open the sleeve and permit the large piston means to be replaced in the fluid of the large cylinder portion, said small piston means upon said latter directional movement expelling fluid out through said outlet, said removable inlet member extending beyond the large cylinder portion, said sleeve and valve means when occupying their position at the end of their travel in said other directional movement extending beyond the end of the large cylindrical portion to afford ready access to said valve means for inspection and cleaning upon removal of the removable inlet member.

2. A pumping device comprising, in combination, a pump cylinder having an inlet member removably connected thereto, a first piston plunger reciprocal in said pump cylinder, a sleeve member reciprocal in said pump cylinder and slidably carried on said piston plunger, the lower end of said sleeve member being adapted to be closed by the said first piston plunger upon the updraft and to be opened upon the downdraft, a check valve mounted in said removable inlet member and adapted to close said inlet opening upon downdraft of the said first piston plunger and to open said inlet opening upon updraft of the said first piston plunger, said removable inlet member extending beyond the pump cylinder,

the lower end of said sleeve member and said first piston plunger when occupying their position at the end of their travel upon the downdraft extending beyond the said pump cylinder to afford ready access to said piston plunger for inspection and cleaning upon removal of the removable inlet member.

3. A pumping device comprising, in combination, a pump cylinder having an inlet member removably connected thereto, a first piston plunger reciprocal in said pump cylinder, a sleeve member reciprocal in said pump cylinder and slidably carried on said piston plunger, the lower end of said sleeve member being adapted to be closed member and by the said first piston plunger upon the updraft and to be opened upon the downdraft, a check valve mounted in said removable inlet member and adapted to close said inlet opening upon downdraft of the said first piston plunger and to open said inlet opening upon updraft of the said first piston plunger, the reciprocal movement of the piston plungers being such that said first piston plunger and the sleeve member closed by said first piston plunger move upwardly to draw fluid from the container up past said check valve and through said pump cylinder and such that said first piston plunger and the sleeve member opened by the said first piston plunger move downwardly through said pump cylinder into the fluid entrapped in said pump cylinder into position for raising said entrapped fluid in the pump cylinder upon the succeeding upward movement of the first piston plunger and sleeve carried thereon, said removable inlet member extending beyond the pump cylinder, the lower end of said sleeve said first piston plunger when occupying their position at the end of their travel upon the downdraft extending beyond the said pump cylinder to afford ready access to said piston plunger for inspection and cleaning upon removal of the removable inlet member.

4. A pumping device comprising, in combination, a housing having an inlet member removably connected to one end thereof and a check valve in said inlet member to prevent escape of fluid drawn into the housing, the said housing having a fluid chamber intermediate of its ends and having an outlet conduit in communication with said chamber, a plunger slidably mounted within said housing and adapted to reciprocally move therein, and a sleeve slidably carried on the lower end of said plunger and within said housing and forming a passageway for the fluid between said plunger and said sleeve, the lower end of said plunger having a head adapted to engage said sleeve to close said passageway upon upward movement of the plunger, and the said plunger having a shoulder portion adapted to engage said sleeve upon downward movement of the plunger, the said sleeve being movable between said head and said shoulder portion, the reciprocal movement of the plunger being such that upon upward movement of the plunger and sleeve raised therewith by the said head, fluid is drawn into said housing and is discharged through the outlet conduit by the said sleeve rising in the fluid chamber, and being such that upon downward movement of the plunger into the fluid chamber fluid entrapped therein by the closing of the check valve at the said inlet is displaced anddischarged through the outlet conduit and such that the said head disengages the sleeve to open said passageway and the said shoulder portion carries said sleeve downwardly in the housing into the entrapped fluid, said removable inlet member extending beyond the housing, the lower end of said sleeve and said head of the plunger when occupying their position at the end of their travel upon the downward movement extending beyond the said housing to afford ready access to said head for inspection and cleaning upon removal of the removable inlet member.

JAMES J. PELOUCH.

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