US2995093A

US2995093A - Rotary pump

Info

Publication number: US2995093A
Application number: US835258A
Authority: US
Inventors: Anthony P Steriti
Original assignee: Individual
Current assignee: Individual
Priority date: 1959-08-21
Filing date: 1959-08-21
Publication date: 1961-08-08
Anticipated expiration: 1978-08-08

Description

1961 A. P. STERlTl 2,995,093

ROTARY PUMP Filed Aug. 21, 1959 2 Sheets-Sheet 1 JNVENTOR.

ANTHONY D. JTEE/T/ A TTOE/VE'YS' 2,995,093 ROTARY PUMP Anthony P. Steriti, 938 Broadway, Chelsea, Mass. Filed Aug. 21, 1959, Ser. No. 835,258 3 Claims. (Cl. 103132) The present invention relat s to a rotary pump of the type having an eccentric slidable on the inner wall of a cylinder between an inlet and an outlet.

Previously proposed and presently in use are rotary pumps of the eccentric type employing an eccentrically mounted rotor on a driven shaft which rolls along the inner wall of a casing or cylinder between an inlet and an outlet, the rolling or sliding of the rotor serving to drive fluid from the inlet to the outlet. Such rotary pumps as have been proposed or are in use present problems in lubricating the same and require periodic attention so that the parts thereof do not wear due to lack of lubrication. Additionally, such pumps as are in use require check valves or manually operable valves between their inlets and outlets in order to prevent backflow of the liquid being pumped when the pump is inoperative.

An object of the present invention is to provide a rotary pump having sealed lubricating means requiring no attention after installation of the pump.

Another object of the present invention is to provide a rotary pump which has positive means for checking the flow of the liquid pump from the outlet to the inlet when the pump is not running.

A further object of the present invention is to provide a rotary pump having a minimum of parts, one having long life characteristics, one sturdy in construction and of simple structure, and one which is economically feasible.

These and other objects and advantages of the present invention will be fully apparent from the following description taken in conjunction with the annexed drawings, in which:

FIGURE 1 is an elevational view of the rotary pump of the present invention showing it operatively connected to a motor, only a portion of the motor being shown,

FIGURE 2 is a view on an enlarged scale, taken on the line 22 of FIGURE 1, with the valve or valve element in closed position,

FIGURE 3 is a view taken on the line 3-3 of FIG- URE 2,

FIGURE 4 is a view similar to FIGURE 2 showing the valve or valve element in open position, and

FIGURE 5 is an isometric exploded view of the rotary pump according to the present invention.

Referring in greater detail to the drawings in which like numerals indicate like parts throughout the several views, the rotary pump of the present invention is designated generally by the reference numeral and is shown in FIGURE 1 with its driven shaft 12 connected to the drive shaft 14 of a motor 16, the motor 16 being only partially shown.

The pump 10 comprises a casing .18 having a peripheral wall 19 and two end walls or

sections

74 and 80, the wall 19 having an inlet 22 adapted to be connected to a source of fluid and having an outlet disposed in opposed relation with respect to the inlet 22.

A closed ended hollow cylinder 24 is positioned within the casing 18 intermediate the outlet 20 and inlet 22 and is provided with an opening 26. A portion of the periphery of the cylinder 24, as at 28 in FIGURE 2, is in abutting relation with the inner wall of the casing 18. The opening 26 is in an opposed portion of the periphery of the cylinder 24 and is intermediate the outlet 20 and inlet 22 of the casing 18. The remainder portion of the periphery of the cylinder 24 on each side of the portion 28 is spaced from the inner wall of the casing 18 and With the inner wall of the casing 18 forms a chamber designated A, FIGURES 2 and 4.

The cylinder 24 is closed at one end by a rotatable disc 30 and on the other end by another rotatable disc 32. A driven shaft 34 projects from one face of the disc 30 and a stub shaft 36 projects from the other face of the disc 30. A sleeve 38 is circumposed about the stub shaft 36 and is carried on one face of the disc 32, as shown most clearly in FIGURE 3, the sleeve 38 being pinned to the stub shaft 36 to be subsequently described.

An eccentric, designated generally by the reference numeral 40, is mounted on the sleeve 38 which rotates with the stub shaft 36 carried by the rotatable disc 30, the eccentric being disposed within the cylinder 24 so that a portion of its periphery is contiguous to the inner wall of the cylinder 24, the eccentric forming with said cylinder 24 the pumping chamber 41.

The eccentric 40 consists in a cylindrical member 42 having open ends and having the ends closed by

closure members

44 and 46.

Packing 48, constituting a sealing means, is interposed between the confronting ends of the

closure members

44 and 46 and adjacent parts of the cylindrical member 42, as shown most clearly in FIGURE 3. The stub shaft 36 is provided with an axially arranged threaded bore 52 receiving therein the shank of a bolt 54. The bolt 54 extends through a hole provided in the disc 32 and is positioned so that its head is received in a recess 56 provided in the disc 32.

The sleeve 38 is provided with a pair of opposed notches in its free end, as at 58 in FIGURE 5, the notches 58 receiving a key element 60 extending through a bore 62 provided in the stub shaft 36. A circular plate 64 covers the face of the one disc 32 remote from the sleeve 38 and is demountably secured thereto by means of a plurality of spaced pins 66. A shaft 68 projects from the face of the plate 64 remote from the disc 32.

Other sealing means in the form of packing 70 is circurnposed about the shaft 68 and is held in place by a cap 72 which is bolted to the casing end section 74. Other packing 76 is similarly circumposed about the shaft 34 and is secured in place by another cap 78 bolted to the casing in section 80.

The stub shaft 36 and sleeve 38 constitute a means by which the eccentric 40 is connected to the shaft 34 so that the eccentric 48' executes planetary movement about the inner wall of the cylinder 24 while maintaining sealing contact with said inner wall responsive to rotation of the shaft 34.

A plate member extends across the chamber A, FIGURES 2 and 4, and subdivides the chamber A into an inlet fluid chamber 23 and an outlet fluid chamber 21. Specifically, the plate member 85 is of L-shape and such member is positioned Within the chamber A so that the long leg 8( is within and extends across the chamber A with the short leg 87 extendable into and withdrawable from the cylinder opening 26. Means connects the plate member 85 or the long leg 86 of the member 85 to the casing 18 for limited rotational movement of the plate member or long leg thereof. Specifically, this means comprises a bar 84, FIGURE 5, which has its mid-portion secured to the free end of the long leg 86 of the bar member 85. The end portions of the bar 84 extend into

housings

88 and 90 projecting exteriorly of the

end sections

74 and 80, respectively, of the casing 18. Suitable packing and sealing means is interposed between the end portions of the bar 84 and the

housings

88 and 90, such packing being similar to the packing heretofore described with reference to the shaft 34 and shaft 68 and not being illustrated in detail. The

housings

88 and 90 support the bar 84 for limited rotational movement.

A valve element 82 is positioned adjacent the opening 26 of the cylinder 24 and is movable between open and closed positions with respect to the opening 26. Means is provided connecting the plate member 85 or the short leg 87 of the member 85 to the valve element 82 and to the eccentric 40 so that the valve element 82 will move between opening and closing. positions relative to the opening 26 in the cylinder 24 responsive to execution of planetary movement of the eccentric 44 while the latter maintains sealing contact with the inner wall of the cylinder 24. Specifically, this means comprises a pair of spaced

trunnion members

92 and 94 fixedly secured to the eccentric 40 and a stub shaft 96 having the portions adjacent each end journaled in the

trunnion members

92 and 94, the stub shaft 96 being carried by the end of the plate member 86 remote from the bar 84. The stub shaft 96 has a mid part 98 of substantially the same size as the

trunnion members

92 and 94 and with the

trunnion members

92 and 94 the mid part 98 forms the portion of the valve element 82 movable between the open position and the closed position relative to the cylinder opening 26.

Each of the

trunnion members

92 and 94 is provided with sealing means or packing 100 secured in place by a closure member 102 constituting a packing gland inserted into the open end of the

trunnion member

92 or 94 through the end remote from the mid part 98 of the stub shaft 96. Bolts 104 secure each

trunnion member

92 and 94 to the adjacent part of the eccentric 40 which is provided with a shallow arcuate groove, as at 106 and shown most clearly in FIGURE 5.

The mid part 93 of the stub shaft 96 is fixedly secured by welding or other suitable means to the free end of the plate member =86.

An adjustable lip member 108 isremovably secured by cap screws 110 to the portion of the cylinder exteriorly of and adjacent the opening 26 for adjusting the size of the opening 26 relative to the effective diameter of the valve element 82.

Suitable bolts 112 secure the

closure members

44 and 46 to the cylindrical member 42 and other bolts 114 secure the casing sections 74 and 8% to the cylindrical element 116 which constitutes the body of the casing 18.

It is to be noted that the cylinder 24 is in sealing contact with the inner surface of the peripheral wall 19 of the casing \18 at a point on one side of a plane through the casing inlet 22 and outlet 20 while the plate member 85 is in sealing contact with the casing peripheral wall 19 at a point on the diametrically opposite side of said plane through the inlet 22 and outlet 21' Also, the valve element 82 has sealing contact with the plate member 85 and cylinder 24 over their entire length. In addition, the eccentric 40 is prevented from rotating as it executes its planetary movement, and the cylinder 24, plate member 85, valve element 82 and eccentric 40, are all of a length such that their ends are in sealing contact with the

casing end walls

74 and 80.

In operation, upon energization of the motor 16 the shaft 12 will rotate in the clockwise direction as viewed in FIGURES 2 and 4. With the inlet 20 connected to a source of fluid to be pumped, the eccentric 46 upon execution of a part of its planetary movement within the cylinder 24 shifts the valve element 82 from the closed position, FIGURE 2, toward and to the open position of FIGURE 4, and permits the flow of fluid from the inlet fluid chamber 23 through the cylinder opening 26 into, around, and out of the pumping chamber '41, and into the outlet fluid chamber 21, andthence out of the outlet 20 of the casing 18, and the eccentric 40 upon execution of the remaining part of its planetary movement within the cylinder 24 shifts the valve element from the open position, FIGURE 4, toward and to the closed position of FIGURE 2, and closes the cylinder opening 26 and prevents the flow of fluid from the inlet fluid chamber 23 into the pumping chamber 41 and from the pumping chamber 41 to the outlet fluid chamber 21.

It is understood that the plate member 86 is of a size and width to completely bridge the chamber formed between the inlet 20 and the outlet 22.

Positive lubrication is assured by the provision of the

packing

48, 70, 76, and and trouble-free operation is easily obtained in the rotary pump of the present invention due to the arrangement of such packing and the associated gland members or closure members holding such packing in place.

What is claimed is:

1. A rotary pump comprising a cylindrical casing having a peripheral wall and two end Walls, the Wall of said casing having an inlet adapted to be connected to a source of fluid and having an outlet disposed in opposed relation with respect to said inlet, a hollow cylinder closed at each end by a rotatable disc fixedly positioned within said casing intermediate said inlet and said outlet and forming with said casing a fluid chamber, said cylinder being provided with an opening intermediate said casing inlet and outlet, a plate member extending across said chamber and subdividing said chamber into an inlet fluid chamber and an outlet fluid chamber, means connecting said plate member to said casing for limited rotational movement of said plate member, said cylinder being in sealing contact with the inner surface of said peripheral wall of said casing at a point on one side of a plane through said casing inlet and outlet while said plate member is in sealing contact with said casing peripheral wall at a point on the diametrically opposite side of said plane through said inlet and outlet, a driven shaft projecting axially from one of said rotatable discs, an eccentric housed Within said cylinder and forming with said cylinder a pumping chamber, means connecting said eccentric to said shaft so that said eccentric executes planetary movement about the inner wall of said cylinder while maintaining sealing contact With said Wall responsive to the rotation of said shaft, a valve element positioned adjacent said cylinder opening, said valve element having sealing contact with said plate member and said cylinder over their entire length, and means connecting said plate member to said valve element and to said eccentric so that said valve element will move between opening and closing positions relative to said opening responsive to execution of planetary movement of said eccentric while the latter maintains sealing contact with the inner wall of said cylinder and is prevented frorn rotating, said cylinder, plate member, valve element and eccentric being all of a length such that their ends are in sealing contact with said casing end walls, said eccentric upon execution of a part of its planetary movement shifting said valve element from the closed position toward and to the open position and permitting the flow of fluid from the inlet chamber through the cylinder opening, into, around, and out of the pumping chamber, and into the outlet chamber, and upon execution of the remaining part of its planetary movement shifting said valve element from the open position toward and to the closed position and closing the cylinder opening and preventing the flow of fluid from the inlet chamber into the pumping chamber and from the pumping chamber into the inlet chamber.

2. A rotary pump comprising a cylindrical casing having a peripheral wall and two end walls, the wall of said casing having an inlet adapted to be connected to a source of fluid and having an outlet disposed in opposed relation with respect to said inlet, a hollow cylinder closed at each end by a rotatable disc fixedly positioned within said casing intermediate said inlet and said outlet and forming with said casing a fluid chamber, said cylinder being provided with an opening intermediate said casing inlet and outlet, a plate member extending across said chamber and subdividing said chamber into an inlet fluid chamber and an outlet fluid chamber, means connection said plate member to said casing for limited rotational movement of said plate member, said cylinder being in sealing contact with the inner surface of said peripheral wall of said casing at a point on one side of a plane through said casing inlet and outlet while said plate member is in sealing contact with said casing peripheral wall at a point on the diametrically opposite side of said plane through said inlet and outlet, a driven shaft projecting axially from one of said rotatable discs, an eccentric housed within said cylinder and forming with said cylinder a pumping chamber, means connecting said eccentric to said shaft so that said eccentric executes planetary movement about the inner wall of said cylinder while maintaining sealing contact with said wall responsive to the rotation of said shaft, means on said cylinder adjacent said cylinder opening and shiftable relative to said opening for adjusting the size of said opening, a valve element positioned adjacent said cylinder opening, said valve element having sealing contact with said plate member and said cylinder over their entire length, and means connecting said plate member to said valve element and to said eccentric so that said valve element will move between opening and closing positions relative to said opening responsive to execution of planetary movement of said eccentric while the latter maintains sealing contact with the inner wall of said cylinder, and is prevented from rotating, said cylinder, plate member, valve element and eccentric being all of a length such that their ends are in sealing contact with said casing end walls, said eccentric upon execution of a part of its planetary movement shifting said valve element from the closed position toward and to the open position and permitting the flow of fluid from the inlet chamber through the cylinder opening, into, around, and out of the pumping chamber, and into the outlet chamber, and upon execution of the remaining part of its planetary movement shifting said valve element from the open position toward and to the closed position and closing the cylinder opening and preventing the flow of fluid from the inlet chamber into the pumping chamber and from the pumping chamber into the outlet chamber.

3. A rotary pump comprising a cylindrical casing having a peripheral wall and two end walls, the wall of said casing having an inlet adapted to be connected to a source of fluid and having an outlet disposed in opposed relation with respect to said inlet, a hollow cylinder closed at each end by a rotatable disc fixedly positioned within said casing intermediate said inlet and said outlet and forming with said casing a fluid chamber, said cylinder being disposed within the casing so that the peripheral portion is in engagement with the inner Wall of said casing, there being an opening in said cylinder intermediate the casing inlet and outlet, an L-shaped plate member positioned within said casing so that the long leg is within and extends across said chamber with the short leg extendable into and withdrawable from the cylinder opening and subdividing said chamber into an inlet fluid chamber and an outlet fluid chamber, means connecting the long leg of said plate member to said casing for limited rotational movement of said plate member, said cylinder being in sealing contact with the inner surface of said peripheral wall of said casing at a point on one side of a plane through said casing inlet and outlet while said plate member is in sealing contact with said casing peripheral wall at a point on the diametrically opposite side of said plane through said inlet and outlet, a driven shaft projecting axially from one of said rotatable discs, an eccentric housed within said cylinder and forming with said cylinder a pumping chamber, means connecting said eccentric to said shaft so that said eccentric executes planetary movement about the inner Wall of said cylinder While maintaining sealing con-tact with said wall responsive to the rotation of said shaft, a valve element positioned adjacent said cylinder opening, said valve element having sealing contact with said plate member and said cylinder over their entire length, means connecting the short leg of said plate member to said valve element and to said eccentric so that said valve element will move between opening and closing positions relative to said opening responsive to execution of planetary movement of said eccentric while the latter maintains sealing contact with the inner wall of said cylinder and is prevented from rotating, said cylinder, plate member, valve element, and eccentric being all of a length such that their ends are in sealing contact with said casing end walls, said eccentric upon execution of a pant of its planetary movement shifting said valve element from the closed position toward and to the open position and permitting the flow of fluid from the inlet chamber through the cylinder opening into, around, and out of the pumping chamber, and into the outlet chamber, and upon execution of the remaining part of its planetary movement shifting said valve element from the open position toward and to the closed position and closing the cylinder opening and preventing the flow of fluid from the inlet chamber into the pumping chamber and from the pumping chamber into the outlet chamber.

References Cited in the file of this patent UNITED STATES PATENTS