US2215138A

US2215138A - Pump

Info

Publication number: US2215138A
Application number: US244509A
Authority: US
Inventors: Stevens Roy
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-12-08
Filing date: 1938-12-08
Publication date: 1940-09-17
Anticipated expiration: 1957-09-17

Description

Sept. 17, 1940@ R. STEVENS 2,215,138

PUMP

Filed Dec. '8, 195s 2 sheets-sheet 1 R. ST'EVENS Sept. 17, 1940.

PUMP

2 Sheets-Sheet 2 Filed Dec. 8, 1938 nventor @y eve Gttornegs Patented Sept. 17, 1940 UNITED vs'rrirrlezs ?TENT OFFEC'E 9 Claims.

This invention relates lgenerally to pumps or compressors and more particularly to the operating mechanism therefor.

One of the objects of the present invention is to provide a new and improved pump or compressor having new and improveddriving means arranged to materially reduce friction in' the Dump- Another object of the invention is to provide a pump having a new and improved arrangement of the operating parts thereof. y

Other objects of the invention will become apparent from the following description taken in connection with the accompanying drawings in i5 which Figure 1 is a longitudinal sectional view of my improved pump;

Fig. 2 is an end view of a plurality of pump cylinders;

Fig. 3 is a View shown in cross section of the pump driving mechanism, taken along the line and in the direction of the arrows 3-3 of Fig. 1, and

Fig. 4 is a view in section of the pump taken along the line and in the direction of the arrows 4 4 of Fig. 1. f

lReferring to the drawings by characters of reference, there is shown a multiple pump which includes a casing I0 of tubular form having a right angle turn or bend .intermediate its ends, the casing preferably being constructed of two longitudinal sections which may be rigidly secured together by bolts and nuts II, or b-y other suitable means. In the casing I0 adjacent each end thereof, is a multiple pumping unit, which includes a plurality of parallel open ended cylinders I2 of which there are six in each unit, in the present instant. The cylinders lz are radially spaced about a central spacer-bearing memm ber I3 to which the cylinders may be rigidly secured, such as by welding, or with which the cylinders may be cast integral, if desired. 'Ihe outer ends of the cylinders I 2 and their respective spacer-bearing members I3 are flush with each 4,5 other and tted over the outerr ends thereof is a plate-like cap member I4, Fig. 1, which may be welded or otherwise secured to the cylinders and to the bearing members I3. The cap member I4 is provided with a plurality of radially spaced 50 ports I5 which register one with each of the outer cylnder ends.

Removable end walls or -header members I6 are rigidly secured, one to each end of the casing, in abutting relation with the outer surfaces .55 of the caprhembers I4 and each of the end Walls (Cl. 10S-162) is provided with an inlet il and a-n outlet I8. The cylinders I2 of each unit are rotatable with and' about they longitudinal axis of their respective spacer-bearing members I3 in the outer end of each of which may be secured a shaft 2D f5 whichmay be journaled for rotation in bored recesses 22 inthe casing end walls` I6. The shafts may be secured to their respective spacer-bearing members I3 by a transverse pin ZI or by any other suitable means. In the inner ends of each l0 of the end walls |55 is provided a pair of arcuate slots or grooves 23, 24, which ycommunicate with the inlets Il and I3 respectively and which are arranged to register with the radially spaced ports i5 of the rotatable cylinder units, as` shown `l5 in Fig. 4.

Disposed in the casing lil is a shaft 25 having end portions 25a at right angles to each other supported in the inner ends of the spacer-bearing members I3 and the shaft 25 is provided, sub- (220 stantially midway of its ends, with a bearing portion 26, arranged with its longitudinal axis. at an angle of 415 with respect to the axes ofrotation of the cylinder units. In the tubular spacer members I3 are provided, thrust bearings 21 en- 25 gaging in sockets in the ends of the shaft 25 and in bearing retainers 28. Disposed in each of the tubular spacer members I3 is a helical coil spring 3U having one end in abutment with the bearing retainer and the other end in abutment with F30 the inner end of the rotatable shaft 20, the spring 30, in addition to retaining the bearings 21 in their sockets, urge the cylinder' units outwardly to hold the abutment plates or caps I4 in tight abutting relation with the inner wall surfaces of :.35 the casing end wallsk I6 to prevent leakage between the abutting surfaces.

Disposed in the casing I3, a plurality of radially spaced rod-like piston `members 32 is provided having end piston portions 25a. received inl40 the cylinders I2, the piston portions of each piston being at right angles to each other. The pistons 32 are formed midway of their ends with crank or bearing portions 33 which are parallel to each other and to the shaft bearing portion 26 45 and are therefore at or acute angles to the aids of rotation of the cylinder units. In order to decrease friction in a pump or compressor of this character, the driving force is` applied tol the pistons midway of their ends, the parallel piston portions or cranks 33 being rotated about the axis ofk the shaft portion 26. With the piston portions or cranks arranged at acute angles to the axis of rotation ofthe cylinder units it will be seen that in order for the pistons to operate Vreciprocation thereto.

suit of slippage with the ring gear.

the piston portions or cranks 28 on rotation about the shaft portion 26 must travel throughan elliptical path, see Fig. 3.

A plurality of radially disposed crank members or hollow spokes which form in part, slip clutch members, are provided and at their inner ends have arcuate or convex bearing surfaces 36a arranged to bear against the shaft portion 26. The crank members 35 are each provided with an elongated opening 36 extending longitudinally thereof providing slideways for slidably receiving and guiding bearing members 38 in each of which one of the piston portions 33 isjournaled for rotation. The outer ends of the cranks 35 are recessed, as at 39, to receive in each a spring pressed ball clutch member 40, and the recessed wall of the cranks is curved and tapered for cooperation or wedging action with the balls lil which also cooperate with the inner wall surface of a driven or rotatable ring gear 3|, which surrounds the cranks, and to which the cranks are coupled and uncoupled during operation of the pump. The ball clutch members 43 are individually urged in the direction of rotation of the ring gear All by helical coil springs 5a disposed in the recessed ends of the crank members 35. The ring gear 4I may be driven by a worm gear 42 or by any other suitable means.

In operation of the pump, the ring gear 4I is rotated at constant speed by the worm gear 42 and in each of the pump units, two pairs of the `opposite cranks 35 are coupled to the ring gear 4I, rotating the piston portion 33 and imparting Only two pairs of the cranks 35 are coupled to the ring gear at any one time, the other pair of cranks being free as a re- However, successive pairs of cranks are intermittently uncoupled from the ring gear 4I, determined by the positions of the crank portions 33 as they travel through their elliptical path. With' the pistons rotating in xed relation with and about the axes of the cylinder unitsand the piston crank portions 33 rotating through an elliptical path, the piston crank portions 33 which at 'the moment are closer to the shaft 26 travel relatively slow while the other or outer pair of piston portions travel relatively fast. As a result, the ball clutch members of the inner two pairs of crank members 35 are wedged between the inner surface of the ring gear 4I and the outer tapered surfaces of the cranks coupling the two pairs of cranks to the ring gear. The other or outer pair of cranks increase in angular speed, adjacent the major axis of the elliptical path, and traveling faster than the ring gear are uncoupled therefrom. Asia result, the pairs of oppositely disposed piston portions 33 which at the moment are traveling at relatively slow peripheral speed are automatically coupled to the driven ring gear 4I by their respective ball clutches 30 while the other pair of opposite piston portions and their cranks 35 have increased angular speed and are therefore uncoupled from the pled and two are uncoupled in each pumping unit at all times during operation. During operation of the pump, the piston portions 33 move toward and away from the axis of the shaft portion 23 and rotate in their slide bearing members 38 and the pistons 32 are reciprocated to pump or compress fluid. Fluid is drawn in through the inlets Il, on the suction strokes of the piston, whence it passes through the arcuate passage 23 and 5 through the aligning ports I5 into some of the cylinders l2. The fluid is` compressed by the pistons 32 yafter which the compressed fluid discharges into the outlet Il when the ports I5 of the rotating cylinder units'register with the ar- 10 cuate outlet passage 24. Ihe cylinder units are constantly rotating under the action of the piston 32 and the ports I5 are continuously align,- ing with the inlet passage 23 and then the outlet passage 24. 15

While I have shown and described my invention in detail it is to be understood that the same is to be limited only by the appended claims for many changes may be made without departingV from the spirit and scope of the invention.

What I claim is:

1. A pump comprising, a cylinder arranged to rotate about an axis spaced from and substantially parallel with the longitudinal axis ofthe cylinder, an inlet and an outlet for said cylinder, a piston for said cylinder and havingra crank portion externally of said cylinder, said portion being rotatableabout an axis extending atan acute angle to the longitudinal axis of said cylinder to reciprocate said piston, said portion rotating through an elliptical path about said second-named axis, constant speed drive means for rotating said portion, and clutch means operatively connecting and disconnecting said drive means and said portion in accordance with varil ation of speed, said portion moving relative to. said last-named means vtoward and away from `said second-named axis in accordance with the members for said portions, said portions being rif-13- individually movable relative to their respective driven members toward and away from said second-named axis, said driven members being relatively radially movable in accordance with variations in peripheral speed of said portions dur- 5.55 ing their travel through said elliptical path, and slip clutch means operative to connect different driven members to said drive means in accordance with peripheral speed of said portions.

3. In a pump, a plurality of radially spaced substantially parallel cylinders arranged for rotation about a common axis, a piston for each of said cylinders, inlets and outlets for said cylinders, said pistonsl having substantially parallel portions externally of said cylinders and ar- E35 ranged to rotate about an axis extending at an acute angle to the axis of said cylinders, said portions rotating through an elliptical path, constant speed drive means to rotate said portions, and means operatively and individually i750 connecting said portions and said 'drive means and compensating for variations in peripheral speed of `said portions travelling through said elliptical path. i

4. In a pump, a plurality of vradially spaced 725 substantially parallel cylinders arranged for rotation about a common axis, inlets and outlets for said cylinders, a piston for each of said cylinders, said pistons having substantially parallel portions externally of said `cylinders and arranged to rotate about an axis extending at an acute angle to the axis of said cylinders, a shaft,

vsaid portions rotating through an elliptical path v substantially parallel cylinders arranged for r0- tation about a common axis, inlets and outlets for said cylinders, a piston for each of said cylinders, said pistons having substantially parallel portions externally of said cylinders and arranged to rotate about an axis extending at an acute angle to the axis of said cylinders, said portions rotating through an elliptical path, constant speed drive means to rotate said portions, said portions being individually movable toward and away from said second-named axis in accordance With travel through said elliptical path, and means successively coupling or uncoupling oppositely disposed portions to said drive means.

6. In a pump, a plurality of radially disposed parallel cylinders arranged to rotate about a common axis, inlets and outlets for said cylinders, a second plurality of radially disposed parallel cylinders arranged to rotate about a common axis at right angles to said rst-named axis, a plurality of right angle pistons having their opposite end portions received in said cylinders, said pistons having parallel portions intermediate their ends extending at acute angles to. said axes, drive means includinga drum surrounding said second-named piston portions, a shaft around Which said second-named piston portions rotate through an elliptical path, a plurality of hollow relatively movable spokes individually mounted on said shaft and extending radially therefrom toward the inner Wall surface of said drum, means operable to successively couple and uncouple opposite pairs of spokes to said drum, and bearing members slidable in said hollovi7 spokes and rotatably supporting said secondnamed piston portions.

7. A pump comprising, a pair of cylinders arranged to rotate about axes relatively angularly disposed, a piston member having opposite end portions received respectively in said 4cylinders and having a crank portion intermediate the ends thereof, said crank portion being arranged to rotate through an elliptical path, drive means, a clutch member having a slideWay extending radially of said axes and receiving said crank portion, and mea-ns cooperable With said clutch member for coupling and uncoupling said crank portion to said drive means in accordance with variations in speed of said crank portion as it travels said elliptical path.

8. In a pump, a pluralty of radially spaced substantially parallel cylinders arranged for rotation about a common axis, a piston for each of said cylinders, inlets and outlets for each of said cylinders, said pistons having substantially parallel portions angularly disposed relative to said axis and rotatable through an elliptical path to reciprocate the pistons and rotate said cylinders, drive means, and a plurality of pairs of oppos'itely disposed slip clutches for operatively connecting said portions to said drive means, said opposite pairs of clutches consecutively clutching and unclutching respective pairs of said portions to said drive means as said portions travel said elliptical path and said portions being movable radially relative to their respective clutch members.

9. In a pump, a plurality of radially disposed parallel cylinders arranged to rotate about a common axis, inlets and outlets for said cylinders, a second plurality of radially disposed parallel cylinders arranged to rotate about a common axis angularly disposed to said first-named axis, a plurality of piston members having their opposite ends received respectively in said rst and second-named plurality of cylinders, said pistons intermediate their ends having substantially parallel crank portions, a shaft substantially parallel to said crank portions and about which said crank portions rotate through an elliptical path, a plurality of pairs of oppositely disposed radially extending spokes individually mounted for rotation on said shaft relative to each other, said spokes respectively engaging said crank portions in sliding relation thereto so that said crank portions may move toward and away from said shaft as they travel through said elliptical path, a gear ring surrounding the outer ends of said spokes, and spring pressed clutch members carried in the outer ends of respective spokes and operable to clutch successively opposite spokes to said gear ring.

ROY STEVENS.