US2213927A - Pump - Google Patents

Description

sept. 3, 1'940.

R. G. GRACEY 2,213,927

PUMP

Filed Aug. 10, 1938 5 Sheets-Sheet 2 Sept. 3,v 1940.

R. G. GRACEY PUMP 5 sheets-sheet s Filed Aug. l0, 1938 Sept. 3, 1940. R. G. GRAcEY PUMP Filed Aug. 410l 1938 5 Sheets-Sheet 4 q '4. 96 will Z no om III... hull! Sept. 3, 1940.

R. G. GRACEY PUMP Filed Aug. 10, 1938 5 Sheets-Sheet' 5 Illl Patented Sept. 3, 1940 UNITED sr PUMP Robert G. Gracey, Oak Park, Ill., assigner to Crane Co., Cook County, Illf, a corporation of Illinois Application August 10., 1938, Serial No. 224,034

7 Claims.

This invention relates to improvements in a shallow well pump, more particularly it relates to a pump structure, in which the various operating parts have been arranged for purposes of improved compactness, accessibility, and durability. Heretoiore shallow well pumps have been made with numerous moving parts exposed to air and dirt and with the pumping piston and the valves disposed in such positions that impeded assembly or repair work. Inasmuch as pumps are cus` tomarily placed on a low foundation it is particularly advantageous to have the plunger readily removable upwardly and the valves easily accessible from the side in order to facilitate the making of repairs or adjustments when required.

It is an object of the invention to provide a simple and compact pump that affords complete 'accessibility for repair or replacement of parts subject to wear or deterioration and at the same time to provide for ease of processing and assembly of the pump parts in the factory.

Another object is to provide a direct geardriven pump having the driving mechanism encased by a housing.

For the purpose of providing improved lubrication, the driving mechanism is partially submerged in a lubricant which is contained in a reservoir within the housing, but which lubricates all parts of the mechanism.

Another important object of the invention is to provide a simple, vertically positioned, direct driven pumping piston in a single casting containing theinlet and outlet valves, the casting being attached to, but separate from, the power mechanismhousing Anotherobject is to provide for economical, simple and effective means for accomplishing the alignment of the crosshead with the plunger rod. l

Other objects and advantages of the invention will become apparent to those skilled in the art as the description proceeds in connection with the drawings in which:

Fig. 1 is a sectional end view of an embodiment of the invention showing the mounting of the crosshead with respect to the driving mechanism and the piston or plunger.

Fig. 2 is a fragmentary sectional front View.

Fig. 3 is a partly sectional fragmentary plan view of the preferred embodiments of the invention.

Fig. 4 is a fragmentary partly sectional front View similar to Fig. 2 with the valve chamber cover removed showing the arrangement of the piston, the valves, and the water now passages.

Fig. 5 is a sectional view of the water end hous- (Cl. i4-114) ing taken on the line 5 5 of Fig. 4, the section being shown with the internal parts removed.

Fig. is a sectional view of the water end housing taken on the line i-t of Fig. 4, also with internal parts removed. i

Fig. 7 is a sectional View of the water end housing taken on the line 1 1 of Fig; 4, also with internal parts removed.

The embodiment of this invention which is shown and described herein is merely for the purpose of illustration and is not intended to re strict the invention to that particular form hereinaiter described.

Like reference characters designate like parts throughout the various views.

Referring to Fig. l, a power end housing, generally designated as i, is formed to enclose the driving mechanismand also to support the water end housing generally designated as 2, which preferably, but not necessarily, is a one-piece casting. p

Referring now to Fig. 2, a prime mover 3, which may be an electric motor or the like, is attached, by the flanged connection so as to communicate with the casing aperture d, by means of the cap screws 5. The drive shaft ii of the prime mover extends within the casing i andhas secured to its innermost enrd the worm screw l which meshes with the worm wheel 8. Axial thrust produced by rotative movement of the screw 'l is absorbed in one direction by the ball thrust bearing 9` mountedon the drive shaft 6 between the screw and the housing of the prime mover 3, and inthe other vdirection by the adjustable screw thrust bearing ii which has the enlarged portion l2 abutting the free end of the screw l. The shank of the thrust bearing l i is screw threadedly positioned within a threaded opening I3 in the case l. The outermost end of the shank of the thrust bearing il contains the diametral groove i4 for engagement with a screw driver when it is desired to adjust the clearance between the bearing face l2 and the screw l. When the adjustment-is made the lock nut i5 may be tightened to secure the positioning of the bearing Il.

Reverting now to Fig. 1, the screw 'l is secured against relative rotative movement with respect to the shaft S by the key i6. The worm wheel 8 is mounted upon the preferably integral collar il of the journaled shaft i8 and is secured against relative movement therebetween by the cap screws i9. The journal bearing 2l has the en-` largement which provides respectively for a receptacle for the thrust bearing 23 and a flange 2li, the latter serving as a cover plate for Vthe opening 25 in the housing I .n The opening 25 type known as double acting; thus two suction is made suiciently large to permit passage therethrough of the Wheel 8 in a preassembled unit with the shaft I8 and the bearing 2|. The cover plate 24 is secured to the housing by a plurality of -cap screws 26. The shaft I8 is retained within the bearing 2| by the threaded extension post 21 having the nut 28 thereon bearing against the plate 29 which in turn bears against the thrust bearing 23. The thrust bearing recess in the enlargement 22 is closed by the cover 3| which is held in place b-y the screws 32.

At the opposite end of the shaft I8, the boss 33 and the crankpin 34 are eccentrically positioned with respect to the rotational axis of the collar I'i, thus forming a crank by which the piston generally designated 35 is driven as hereinafter explained. The pitman 36 has the bearing 3'I at its lower end in which the crankpin 34 is journaled and has another bearing 38 at its upper end through which the wrist pin 39 extends so as to journal in the bearings 4I provided in the crosshead 42. The crosshead 42 is reciprocably retained within the upwardly extending crosshead guide 43 of the casing l, the skirt 44 of the crosshead being relieved at 45 to provide clearance for the worm 'I when the crosshead is at the lower extremity of its stroke. The upper end of the crosshead42 has attached to it by means of the cap screws 46 the triangularly shaped offset coupling 4'! (more clearly shown in Fig. 3) the apex of which overhangs the periphery of the crosshead and has connected to it the plunger rod 48 which extends therethrough and is: adjustably secured against relative movement therewith by the upper and lower nuts 49.

The plunger rod 48 extends downwardly from the coupling 41 through the stuiling box 5| into the cylinder chamber 52 and has attached to its lower end the plunger 35. The stuing box 5| is screw threadedly attached at its lower end 53 to the water end housing 2 and contains in its upper end in va recess 54 a quantity of compressible packing 55 upon which bears a gland 58 pressed downwardly by the nut 5l in threaded engagement with the upper end of the stuffing box 5|.

The Yplunger 35 is assembled on the rod extension 58 and comprises two exible cups 59, preferably made of leather or similar material, placed back to back with a washer BI therebetween and respectively secured by the washers B2 held in place by the nut 53. The liner 84 within which the plunger 35 is reciprocably positioned is press fitted into a suitably prepared central portion of the cylinder chamber 52.

' The power mechanism housing I and the water end housing 2 are preferably made of separate singlecastings which are secured together by a plurality of bolts 65 studded into the casing I and extending through suitable apertures in the housing 2 with the nuts 66 bearing against the latter housing.

In the latter connection and referring now to Fig. 3, the casing I and the housing 2 are maintained in horizontal alignment by a key |05 inserted in the vertical grooves |86 and IU'I respectively inthe cooperating faces of the casing I and the housing 2, by which latter means the alignment of the crosshead with the plunger rod is accomplished.

Y Returning to Fig.v 1, each bolt 65 has the threaded extension 6l which projects through the valve cover plate 68 and provides for the nut 69 to bear against the plate 68.

'Ihe pump herein shown and described is of the valves and two discharge valves are required, The valve chamber portion of the housing 2 is constructed with the water passages directing the water, as it proceeds through the pump, to a location behind each valve so that the water passing through each valve must come from behind the valve disc to a chamber in front of' the valve disc each Valve operating in an identical manner. As indicated, the complete Valve assembly comprises respectively a seat 'II and a disc 'I2 yieldably held in contact with the seat 'II by the spring 'I3 being compressed by the screw 'I4 extending therethrough and which latter member is threadedly mounted within a hub 'I5 of the seat 1I. It will be noted that the valve seat 'II is secured within an opening in the wall which divides or separates the inlet and outlet of the valve chamber.

The housing I is provided with the piping connection 'i8 which permits the introduction of lubricating oil into the reservoir formed by the lower portion of the housing. During the operation of the pump the worm wheel 8 carries oil up to the worm 'l from which it will be thrown by centrifugal force to lubricate all of the parts of the driving mechanism. The upper end of the crosshead guide 43 is recessed at 'I'I to receive oil which creeps upwardly along the crosshead 42; the passage 'I8 is provided to return the creepage to the interior of the housing. The passage 'I8 also serves as an air vent for equalizing the air pressure inside and outside of the housing. The angularly formed guard 'i9 which is attached to the upper end of the crosshead 42 and which extends orwardly and then downwardly therefrom prevents water which may pass through the stufing box 5| from contaminating the lubricating oil. Such water might otherwise collect in the recess TI, and from such location it would eventually iind its way into the housing I, causing objectionable admixture of Voil and water therewithin.

Referring to Fig. 3, the upper portion of the water end housing 2 is divided into two compartments, the suction chamber 8 I and the discharge chamber 82 which are above and on each side of the cylinder chamber 52. The suction chamber 8| extends vertically from the body portion of the water end housing and has connected to it the suction pipe 83 through which water enters the pump. The discharge chamber 82 likewise extends vertically from the body portion of the water end housing 2 and in addition extends rearwardly over a portion of the mechanism housing I to provide a large volume discharge chamber which is vrequired because of the positive discharging action of the plunger 35. The discharge pipe 84 and the pressure limit switch B5 are connected to the discharge chamber 82. The switch 85 is the conventional pressure limit switch which shuts ofi" and turns on the prime mover when the discharge pressures reach respective predetermined maximum and minimum limits. The switch 85 forms no part of the invention and thus its particular construction need not be described herein. The plugs 86 which are provided in the upper walls of the chambers 8l and B2 are removable when it is desired to prime the pump by introducing water into the various chambers and passages.

Referring to Fig. 4, the manner of operation of this pump is similar to that of a conventional suction type shallow well pump. A reciprocating piston by enlarging and decreasing the volume of the chamber between it and the valves respectively pulls water into the chamber through the suction valve then forces it out through the discharge valve. During the down stroke of the plunger 35, water flows into the suction chamber 8| through the pipe 83. Inside the chamber 8| the water travels downwardly through the passage 86 (more clearly shown in Fig. 5) to the chamber 8l located behind the suction valves 88 and 89. From the chamber 81 the path of water travel is forward through the opening 9|, the water lifting the valve 88 from its seat 92, then coursing through the passage 93 (more clearly shown in Fig. 7) into the cylinder chamber 52. Also on the downward stroke the water in the lower portion of the cylinder chamber'52 which is beneath the plunger 35 is forced into the chamber 94 (more clearly shown in Fig. 6) which is behind the valve 95. From the chamber 94 the water passes through the opening 96 into the l chamber 9T, then through the passage 98 into the discharge chamber 82 and from there into the discharge pipe 84. During the upward stroke of the plunger 35, water is drawn through the suction pipe 83, the passage 88, the chamber 81, the opening 99 (lifting the valve 89) into the chamber ||J| and-from there into the lower portion of the chamber 52. Also during the upward stroke of the plunger 35 the water in the upper portion of the chamber 52 is forced into the chamber |82 (more clearly shown in Fig. 6) which is behind the valve |83 and from there the water is forced through the opening |04 (lifting valve |03), into the chamber 91, through passage 98, into the discharge chamber 82 and from there into the` dischargepipe 84. Thus it will be seen that during the downward stroke Iof the plimger 35 the valves 8.8 and are open and during the upward stroke of the plunger the valves 89 and |03 are open and at the end of each stroke the valve springs maintain their respective valves in contact with their respective Seats.

Having thus described the construction and mode of operation of my invention, what I claim, and desire to secure by Letters Patent, is:

1. A pump comprising a prime mover, a driving mechanism, a driven mechanism, the said driving mechanism being encased in a housing and partially submerged in a lubricant contained in a reservoir within the said housing, the said housing having drain means for directing lubricant escaped from said driving mechanism and deposited on the exterior of the said housing back into the said reservoir.

2. A pump comprising a prime mover, a driving mechanism, a driven mechanism, the said driving mechanism being encased in a housing and partially submerged in a lubricant contained in a reservoir within the said housing, the said housing having drain means for directing lubricant escaped from said driving mechanism and deposited on the exterior of the said housing back into the said reservoir, the said drain means also functioning as a vent for the said driving mechanism housing.

3. In a pump, a prime mover, a driving mechanism, a driven mechanism, an operative connection between the said driving and driven mechanisms, a housing for the said driving mechanism,

a housing for the said driven mechanism, a cover plate for the said latter housing, means for detachably securing the said latter housing to the said former housing, the said means serving also to detachably secure the said cover plate to the said latter housing.

4. In a pump, a prime mover, a driving mechanism, a driven mechanism, an operative connection between the said driving and driven mechanisms, a housing for the said driving mechanism, a housing for the said driven mechanism, the said driving mechanism being disposed in abuttingV juxtaposition to the said driven mechanism, enclosing means cooperating with the said latter housing, means for detachably securing the said latter housing to the said former housing, the said means serving also to detachably hold the said enclosing means to the said latter housing.

5. In a mechanical movement comprising a worm gear driving mechanism, the said driving mechanism including a crosshead, a driven mechanism, an operative connection between said driving and driven mechanism, a housing for the said driven mechanism, a prime mover therefor having an extended cantilever drive shaft, a screw gear mounted upon the said cantilever drive shaft, the said screw gear being normally held against relative rotative movement with respect to the drive shaft, and means exterior of the said housing for adjustably restricting the axial movement of the said screw gear relative to the said drive shaft, the said latter adjusta-` ing, the said gear means and the said journaling means being removable as a unit through the said housing, the connection between the said driving and driven mechanism being normally xed but adjustable axially relative to the driven mechanism.

7. In a mechanical movement of the character described comprising in combination a driving mechanism, a driven mechanism, an operative 'connection between the said driving and driven mechanism, the said driving mechanism includ-` ing respectively a crosshead, la crankpin and a gear, a mechanical connection between the said crankpin and the said crosshead, a housing therefor including a demountably attached support for the said driving mechanism mounted by its outermost end upon the said housing, the said support including a cantilever mounting for the said gear having the said crankpin lattached directly to the said gear.

ROBERT G. GRACEY.

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