US1921747A

US1921747A - Rotary pump or the like

Info

Publication number: US1921747A
Application number: US341186A
Authority: US
Inventors: Edgar E Greve
Original assignee: Oil Well Supply Co
Current assignee: Oil Well Supply Co
Priority date: 1929-02-19
Filing date: 1929-02-19
Publication date: 1933-08-08
Anticipated expiration: 1950-08-08

Description

Aug. 8, 1933- E. E. GREVE 1,921,747

ROTARY PUMP OR THE LIKE Filed Feb. 19, 1929 s Sheets-Sheet 1 Fig.4.

1 L 1 I w '1 7 i IN W VENTOR Aug. 8, 1933. E. GREVE 1,

' ROTARY PUMP OR THE LIKE Filed Feb. 19, 1929 3 Sheets-Sheet 2 {5 INVENTOR 3a "7 4 I I I I Aug. 1933- E. E. GREVE 1,921,747

ROTARY PUMP OR THE LIKE Filed Feb. 19, I929 3 Sheets-Sheet 3 P/araws 5- J}.

Dar/rim: Meow 5 Patented Aug. 8, 1933 1,921,747 ROTARY PUMP OR THE LIKE Edgar E. Greve, Bellevue, Pa., assignor, by mesne assignments, to Oil Well Supply Conipany, Pittsburgh, Pa., a Corporation of New- Jersey Application February 19, 1929. Serial No. 341,186

15 Claims.

This invention relates to a new and improved rotary pump or the like, for instance, a rotary motor, and contemplates a construction that may be effectively employed eitherin an apparatus in which an externally-applied power causes my device to displace and deliver a fluid such as a liquid, i. e., a pump; or in an apparatus in which a fluid such as a gas under pressure operates the apparatus, i. e., a motor; to cause the latter to deliver. mechanical power.

In the present application, I have shown an embodiment of my invention in the form of a rotary pump.

The present invention contemplates a construction embodying a pair of aligned shafts, a plurality of rotor members fixedly mounted on said shafts and including two sets of rotatable piston elements, a fluid chamber in which the piston elements operate, and means for rotating said shafts and rotatable piston elements in the same direction and at different speeds to produce a plurality of alternate suction and discharge said chamber to effect an increase and decrease.

of the volume of fluid in the chamber; to provide a construction in which the alternate annular displacement of one set of pistons exceeds that of the other set; to provide a construction embodying means for driving the sets of piston elements independently of each other; to provide a simple and eflicient driving gear mechanism embodying a set of circular gears and a set of non-circular gears and/or two sets of non-circular gears; and a construction in which the piston elements are disposed on a radius and maintain the same radial distance from the axes of the aligned shafts throughout the complete cycle of operation.

Other objects and advantages will become apparent from the description taken in connection with the accompanying drawings, wherein:

Fig. 1 is an end elevational,view of a rotary pump embodying my invention;

Fig. 2, a sectional view takenon the broken line II-II of Fig. 1;

Fig. 3, an inner face view of one of the casing halves, showing the location of the ports;

Fig. 4, a sectional view on the line IV-IV of Fig. 1, showing the suction connection;

Fig. 5, a sectional view on the line V-V of Fig. 1, showing the discharge connection;

Fig. 6, a face view of one of the piston-carrying members;

Fig. '7, a similar view of piston-carrying member;

Fig. 8, a cross-section on the line VIIL-VIII of Fig. 6;

Fig. 9, a diagrammatic view, showing the position of the pistons and ports in

phases

1 and 3;

Fig. 10, a diagrammatic view, showing the positions of phases 2 and. 4;

Fig. 11, a diagrammatic view, showing the positions of the parts midway between phases 1 and 2; and

Fig. 12, a diagrammatic view, showing the application of two sets of non-circular gears to the pump.

In the drawings, 5 designates a drive shaft associated with the pump proper; this shaft is mounted in suitable bearings 6 and may be driven in any manner desired, as by a pulley, not shown, fixed to one end thereof.

In the embodiment of my invention as illustrated, I have provided two aligned shafts mounted in bearings 7 and respectively designated 8 and 9. These shafts are partly disposed in horithe complementary zontal alignment in a two-part or divided casing comprising two similar halves 10 and 11, and project from the casing on two sides thereof through stufling boxes 12 and 13. The inner or adjacent ends of the said shafts are spaced apart a sufficient distance to provide a running distance halves 10 and 11 aresecured together by means of bolts 18 to maintain the piston-carrying members in face-to-face contact, and are provided with base portions 19 for positioning the pump.

The inner contacting faces of the rotors or piston-carrying

members

14 and 15 are formed with

complementary recesses

20 and 21 forming, when the parts are assembled, an'annular fluid cess of the other member.

chamber or piston race in which are located a plurality of arcuate pistons, generally designated A and B, the pistons of one member being adapted to extend into the complementary re Said rotors or pistoncarrying members are also respectively provided with ports or openings Pa and Pb, as will be hereinafter more fully described.

Casing halves 10 and 11 are each formed with ports and passages including arcuate suction ports S1 and S2, and discharge ports D1 and D2, in alternate relationship, as shown in Fig. 3. The ports S1 and S2 are in communication with an annular suction passage 22, which latter opens into suction connection 24, as shown in Fig. 4. Ports D1 and D2 are in communication with an annular passage 23, which opens into a discharge connection 25, as in Fig. 5.

As illustrated and as preferred, the pump is driven by gear mechanism comprising two sets of gears X and Y. As shown, I provide circular gears 26 and 2'7 comprising gear set X and

elliptical gears

28 and 29 comprising gear set Y.

Gears

26 and 28 are keyed to the drive shaft 5 and mesh with their

respective gears

27 and 29, keyed to the pump shafts 8 and 9 respectively. In this manner, it will be seen that pump shafts 8 and 9 with their associated parts will be driven in the same direction but at different speeds, due to the ratios of the gear sets X and Y. As the pump is rotated, this variance in speed will produce, by the operating pistons A and B, a1- ternate increase and decrease of the volume enclosed in the annular chambers or races described above.

In Figs. 6 and 7, the relative positions of the pistons are shown. Piston-carrying member 14 is provided with pistons A and A1, disposed 180 degrees apart, and with ports Pa and Pa1, in communication with the piston chamber. Similarly, member 15 is provided with pistons B and B1 and ports Pb and Pb1.

Referring to Figs. 9, 10 and 11, it is assumed that the member 15 of Fig. '7 is inverted and positioned in place upon the member 14 of Fig. 6, both of saidmembers being superimposed over casing half 10 of Fig. 3. The starting position of the pumps or phase 1, as shown in these diagrammatic figures, is represented on Fig. 1 bythe position of

gears

28 and 29. Such gears, being elliptical in design, have four change points 01, c2, 03 and c4 of the gear 28, and c5, 06, c7 and es of the gear 29. The angles between 0102, 03-01, 01-01, and 05-08, are designated a, whereas the angles between 01-04, 0H3, 05-011, and 07-08 are designated b. When the respective change points of said gears are in contact, both

gears

28 and 29 rotate at an equal speed.

Assuming the direction of rotation shown by the arrows and that gear 28 rotates through an angle a, the gear 29 and member 15 will rotate through an angle b, or until 02 and cs are in contact. Gear 28 being keyed to the drive shaft 5, said shaft also rotates gear 26 through an angle a, which in turn rotates gear 27 and member 14 through an angle a, in the same direction. The member 14 and its pistons A and A1 travel through the angle a while member 15 and its pistons B and B1 rotate through the angle b. And since angle a is greater than angle b, the pistons A and A1 will have a greater rotation by the difierence between said angles.

During the motion just described, it will be seen that piston A and A1 will create a suction through the ports Pa, Pm, and S1 and S2 of casthe pistons A, A1, and piston B, B1, will cause.

discharge through the ports Pb, Pb1, of the'casing half 11. Such varying angular displacement or speed may be said to produce suction and discharge strokes.

The operation just described may be termed phase 1 of the pump. Such action will be repeated in phase 3, whereas in phases 2 and 4, the member 15 and pistons B, B1, will move through the angle a; and member 14 and pistons A, A1, will move through the angle b. Such action will cause suction through ports Pb, Pb1, and ports S1 and S2 of easing half 11, and discharge through ports Pa, P111, and ports D1 and D2 of casing half 10. In other words, the action of the pump in

phases

1 and 3 is alternated in phases 2 and 4.

Continued rotation of the pump will produce a constant flow of water through the repeated actions of the pistons and ports. For each phase of the pump there will be two suction strokes and two discharge strokes, first through one side of the pump and then through the other side.

As shown in Fig. 12, the pump may be operated by two sets of non-circular gears. Elliptical gears 26a and 28a, keyed or otherwise secured to shaft 5, mesh with elliptical gears 27a and 29a -respectively. Gear 27a is keyed to shaft 8 and gear 29a is keyed to shaft 9. The suction and discharge ports in the casing halves remain unchanged, as do the angular positions of the pistons A and B.

Assuming that shaft 5 is turned through an angle of 90 degrees, gears 26a and 28a will also turn through 90 degrees. But, due to the configuration of the gears, gears 27a, shaft 8, pistoncarrying member 14, and pistons A and A1 will rotate through an angle a, while gea'r 29a, shaft 9, piston-carrying member 15, and pistons B and B1 will rotate through an angle b. Since angle a exceeds angle b, the piston will have a stroke a-b degrees. The alterate stroking of the pistons is similar to that previously described.

From the foregoing, it will be understood that when my invention is used as a pump, and as particularly shown by the form of Fig. 1, one of the aligned shafts and the rotor or piston-element carrier fixed thereto is driven at a constant speed and the other sliaft'and its associated parts at a variable speed, so that the latter shafts speed will increase and decrease relatively to the constant speed of the just-mentioned shaft, thus causing the pistonelements of the variable driven shaft to approach and recede from the piston elements of the constant speed shaft. As the piston elements separate, suction is produced, and as they approach, discharge is effected, the piston elements and the arrangement of ports in the rotors or carriers being such as to provide for an alternate annular displacement of 'one set of pistons in excess of the other set.

In the event my apparatus is employed as a motor, as distinguished from a pump, fluid under pressure is introduced through the discharge connection and is designed to drive the device at a uniform speed.

Iclaim:

1. In a rotary pump or the like, a casing, a pair of aligned pump shafts operable in the easing, rotors fixed to the respective pump shafts, said rotors having complementary faces thereof in contact and provided with recesses to form a fluid chamber enclosed by said rotors, a piston element mounted on each rotor and operable in the fluid chamber, said casing being formed with suction and discharge passages in communication with said chamber. 1

2. In a rotary pump or the like, a divided casing with each part formed with a fluid passage registering and in communication with a fluid passage in the other part, a pair of aligned shafts operable within the casing, a pair of rotors fixed one to each of the shafts and arranged with complemental faces in contact, said faces each formed with an annular recess, piston elements carried by each rotor and projecting therefrom into the recess of the other rotor, said rotors each formed with a port communicating with its recess and communicating intermittently with the fluid pas sage in one part of the casing.

3. In a rotary pump or the like, a divided casing having each part formed with fluid passages therein and assembled to provide an annular space between the parts, a pair of coaxial shafts operable within the casing, a pair of rotor members mounted on the shafts and disposed within the annular space of the casing, said rotors contacting and formed with opposed recesses to provide an annular chamber, said rotors having inlet and discharge ports leading from the recesses, two sets of piston elements disposed in the annular chamber and movable with the respective rotors, and mechanism co-acting with the coaxial shafts for driving the rotors in the same direction and at different speeds.

4. In a rotary pump or the like, a casing, a pair of aligned shafts operable within the casing, a pair of piston carriers fixedly secured to the shafts and arranged in facial contact and having communicating recesses forming an annular fluid chamber, arcuate piston elements on the respective carriers and operable in the fluid chamber, and means for imparting different speeds to the respective carriers and their piston elements, said casing having admission and exhaust conduits to and from the annular chamber, and said carriers having ports for the flow of fluid when in communication with the conduits in the casing.

5. In a machine of the class described, a casing having a rotor chamber provided with inlet and discharge ports opening' through a side wall of the casing, a pair of rotors each forming a side wall of a fluid chamber and separating said fluid chamber from the side walls of the casing, said rotors having portions constituting pistons cooperating with the fluid chamber, one of said rotors having an opening for intermittently placing said fluid chamber in communication with the inlet port and for intermittently placing said fluid chamber in communication with the discharge port, and drive means operatively connected to said rotors, said drive means being adapted to rotate the rotors in the same direction at different speeds if the machine be operated as a pump and being adapted to be rotated by the differential rotation of the rotors in the same direction if the machine be operated as an engine.

6. In a machine of the class described, a pair of rotors mounted coaxially in abutting relation and cooperating to enclose an annular piston chamber, each rotor. forming a side wall of the.

piston chamber, said rotors having portions con-' chamber, means for rotating the'rotors in the.

same direction at different speeds, and fluid supply and exhaust means arranged adjacent the path of the rotor having the passageway and adapted to alternately register with the passageway therein.

'7. In a machine of the class described, a pair of rotors mounted coaxially in abutting relation and cooperating to enclose an annular piston chamber, each rotor forming a side wall of the piston chamber, one of said rotors having a passageway through the respective side wall of the piston chamber, said rotors having portions constituting pistons cooperating with the piston chamber, means for rotatingthe rotorsin the same directionat different speeds, and a casing for the rotors having fluid inlet and discharge ports arranged to register alternately with said passageway through one of said rotors.

8. In a machine of the class described, a pair of disc-like rotors mounted coaxially, in abutting relation and cooperating to enclose an annular piston chamber, one of said disc-like rotors having a passageway therethrough communicating with the piston chamber, said rotors having portions constituting pistons cooperating with the piston chamber, means for rotating the rotors in the same direction at different speeds, and a casing for the rotors having a side wall against which the rotor with the passageway is disposed, said.

casing being provided with fluid inlet and discharge passages opening through inlet and discharge ports in said side wall, said inlet and discharge ports being arranged to alternately register with said passageway in'the rotor.

9. In a machine of the class described, a casing provided with inlet and discharge passages opening into the interior thereof through inlet and discharge ports, relatively rotatable coaxial rotors mounted in the interior of the casing, said rotors together enclosing an annular piston chamber, said rotors having portions constituting pistons cooperating with the piston chamber, and means for rotating the rotors in the same direction at different speeds, one of said rotors having a passageway therethrough for connec ing said piston chambers to said inlet and discharge ports alternately.

10. In a machine of the class described, a casing provided with pairs of inlet and discharge passages opening into the interior thereof through inlet and discharge ports, relatively rotatable disc-like coaxial rotors mounted in the interior of the casing in facial contact, said rotors together enclosing an annular piston chamber, said rotors having portions constituting pistons cooperating with the piston chamber, and means for rotating the rotors in the same direction at different speeds, each of said rotors having a passage therethrough for connecting said piston chamber with an inlet and a discharge port alternately.

11. A machine of the class described including a casing, a pair of aligned shafts projecting from opposite sides into said casing, a rotor carried by each shaft for rotation side by side, said rotors together enclosing a fluid chamber, each rotor carrying a piston for arcuate oscillation within the fluid chamber, means including a passageway extending through a rotor and cooperating passageways in the casing for supplying fluid to and discharging fluid from said fluid chamber,

anddrive means operatively connected to said shafts,- said drive means being adapted to rotate the rotors in the same direction at different speeds if the machine be operated as a pump and being adapted to be rotated by the differential rotation of the rotors in the same direction if the machine be operated as an engine.

12. A'machine of the class described including a pair of aligned shafts, a rotor carried by each shaft, said pair of rotors having abutting faces slidable relative to each other angularly about the common axis of said shafts, said rotors together enclosing an annular fluid chamber, a piston element carried by each rotor and operable in the fluid chamber, one of said rotors being traversed by a passage in communication with said fluid chamber, means controlled by the angular position of said rotor about said axis for supplying fluid to and discharging fluid from said passage, and drive means operatively connected to said shafts, said drive means being adapted to rotate the rotors in the same direction at different speeds if the machine be'operated as a pump and being adapted to be rotated by the differential rotation of the rotors in the same direction if the machine be operated as an engine.

13. A machine of the class described including a pair of aligned shafts, a rotor carried by each shaft, said rotors cooperating to enclose an annular fluid chamber, a piston element carried by each rotor and operable in the fluid chamber, means for supplying fluid to and discharging fluid from the machine, said means having inlet and outlet ports adjacent a rotor, said rotor cooperating with said ports to control flow of fluid to and from said fluid chamber, and drive means operatively connected to said shafts comprising a shaft parallel to said pair of shafts and operatively connected by a gear train to each of said pair of shafts, one gear train being adapted to connect the shafts for rotation at constant speed and the other gear train including elliptical gears.

14. A machine of the class described including a casing, a pair of aligned shafts projecting from opposite sides into said casing, a disc-like rotor carried by each shaft for rotation side by side with their adjacent faces in sliding contact, said faces being recessed to provide jointly an annular fluid chamber, a piston element carried by each rotor and operable in the fluid chamber, said casing having inlet and outlet ports for supplying fluid to and receiving fluid from the fluid chamber, the supply and discharge of fluid to and from the fluid chamber by said ports being controlled bypassing through a rotor, and drive means operatively connected to said shafts, said drive means being adapted to rotate the rotors in the same direction at different speeds if the machine be operated as a pump and being adapted to be rotated by the differential rotation of the rotors in the same direction if the machine be operated as an engine.

15. A machine of the class described including a pair of aligned shafts, a rotor carried by each shaft, said rotors having abutting faces and each face being so recessed that said rotors together enclose an annular fluid chamber, a piston element carried by each rotor and operable in the fluid chamber, drive means operatively connected to said shafts, said drive means being adaptedv to rotate the rotors in the same direction at different speeds if the machine be operated as a pump and being adapted to be rotated by the differential rotation of the rotors in the same direction if the machine be operated as an engine, and means controlled by the angular position of a rotor about its axis for supplying fluid to and discharging fluid from said fluid chamber.

EDGAR E. GREVE.