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Publication numberUS2789511 A
Publication typeGrant
Publication dateApr 23, 1957
Filing dateMay 25, 1953
Priority dateMay 25, 1953
Publication numberUS 2789511 A, US 2789511A, US-A-2789511, US2789511 A, US2789511A
InventorsDoble Warren
Original AssigneeJabsco Pump Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Flexible vane pump impeller
US 2789511 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

April 23, 1957 w. DOBLE FLEXIBLE VANE PUMP IMPELLER Filed May 25, 195s INVENTOR.

. WARREN DOBLE BY H/s ATTORNEY@ HARR/s, K/ecH, Fos Tena; Hake/5 2,789,511r FLEXIBLE VABIE PUMP IMPELLER Warren Doble, North Hollywood,l Calif., assigner, by

mesne assignments, to Jabsco Pump Company, Burbank, Calif., a corporation of California Application May 25, 1953, Serial No. 356,968

The present invention relates to a pump having an impeller of the flexible vane type, such as that disclosed and claimed in United States Patent Number 2,189,356,

`granted February 6, 1940, to Arthur M. Briggs, im-

pellers of this type ordinarily being formed in whole or in part of rubber, or similar elastomeric materials.

An impeller of the foregoing general character may be provided with exible vanes the outer ends of which are bulbous as viewed in a plane normal to the axis of rotation of the impeller, and a primary object of the invention in this conection is to offset the bulbous outer ends of the vanes in a direction opposite to the direction of rotation of the impeller. This construction has the effect of reducing the flexure of the vanes for a given thickness of the cam employed to flex the vanes, this reduction in vane llexure resulting in a material increase in the service life of the impeller, which is an important feature of the invention.

Another important object is to provide an impeller of the foregoing character having ilexible vanes provided with feathered edges engageable with the end walls of the impeller chamber of the pump, the feathered edges of the vanes lying on the neutral axes thereof, With conventional flexible vanes having unfeathered edges, flexure of the vanes by the cam produces what might be termed knuckles where the vane edges engage the end walls of the impeller chamber, such knuckles resulting from the fact that the fibers of rubber on the outer sides of the curves in the vanes are in tension while the bers on the inner sides of the curves in the vanes are in compression, which has the eifect of causing the rubber to expand axially with a resultant increase in friction between these knuckles and the end walls of the impeller chamber. Such knuckles have been found to be a source of internal leakage in pumps of this type. By feathering the vane edges, the present invention eliminates such knuckles since the neutral axes of the vanes are neither in tension nor compression when the vanes are flexed by the cam, the feathered edges, as hereinbefore indicated, lying on the neutral axes of the vanes. Such elimination of internal leakage by feathering the vane edges constitutes an important feature of the present invention.

Another important object of the invention is to provide the end faces of the hub of the impeller with a plurality of axially projecting ribs, each end face of the hub preferably having a plurality of annular and radial ribs forming a pattern somewhat similar in appearance to that of an ordinary wallie iron. This Waie iron configuration on each end of the impeller hub provides bafes to prevent internal leakage past the hub and also materially reduces friction between the end faces of the hub and the end walls of the impeller chamber, which are important features.

United States Patent "ice drawing and which is described in detail hereinafter. Referring to the drawing:

Figure 1 is a cross-sectional View of a pump incorporating the impeller of the present invention;

Figure 2 is a fragmentary sectional view taken along the arrowed line 2 2 of Figure l; and

Figure 3 is an enlarged, fragmentary sectional view taken along the arrowed line 3-3 of Figure 2.

In the drawing, the numeral 10 designates a pump housing which is provided with an impeller chamber 11v and which is provided with inlet and outlet ports 12 and 13 communicating with the impeller chamber, a cam 14 being provided between the inlet and outlet ports, as is conventional. Concentrically mounted in the impeller chamber 11 on a shaft 15 is an impeller 16 of the invention which is rotatable in the direction of the arrow 17, the impeller preferably being formed in whole or part of rubber, or a similar material, and including a central hub 18 having exible vanes 19 radiating therefrom. These vanes are flexed by the cam 14 as the impeller 16 rotates so as to pump iiuid from the inlet port 12 to the outlet port 13, as is well known in the art.

Considering the impeller 16 of the invention in more detail, the vanes 19 are provided with outer ends 23 which are bulbous, as viewed in a plane normal to the axis of rotation of the impeller, the bulbous outer ends, or bulbs, being offset laterally relative to the vanes 19 in a direction opposite to the direction of rotation 17 of the impeller, i. e., the centers of the bulbs being offset laterally relative to the radial center lines or Vneutral axes of the vanes in a direction opposite to the direction of impeller rotation. With bulbs 23 offset in this direction, the sides of the bulbs which engage the cam 14 do not project beyond, or project only very slightly beyond, the forward faces of the vanes 19. The effect of this construction is to materially reduce the amount of exure of the vanes, as compared to vanes having centered bulbs at their outer ends, as taught by the aforementioned Briggs patent, for example. In other words, it will be apparent that the iiexure of the vanes is reduced by an amount equal to the reduction in the amount which the bulbous outer ends project forwardly of the forward faces of the vanes 19. This reduction in vane flexure is quite important since, as hereinbefore pointed out, it adds materially to the service life of the impeller.

As best shown in Figure 3 of the drawing, the edges 24 of the vanes 19, which are engageable with the end walls of the impeller chamber 11, are feathered, or substantially feathered, the thickness of the edges 24 being very small as compared to the vane thickness. As hereinbefore discussed in detail, this has the effect of reducing friction and of eliminating or minimizing internal leakage between the edges of the vanes and the end walls of the impeller chamber, which are important features.

As best shown in Figure l of the drawing, each end of the hub 18 of the impeller 1611s provided with a plurality of ribs 2S and 26 which project axially of the impeller and which are engageable with the adjacent end wall of the impeller chamber 11, the ribs 25 being annular and the ribs 26 being radial in the particular construction illustrated. Also in the particular construction illustrated, the radial ribs 26 are shown as being, in effect, extensions of the feathered edges 24 of the vanes 19. The pattern of ribs 25 and 26 provides each end face of the hub 1S with a configuration similar to that of a waffle iron in the particular construction shown. However, different patterns of axially projecting ribs on the end faces of the impeller hub 18 might be employed, such as rib patterns resulting from dimples in the end faces similar to the `dimples in the surface of a conventional golf ball. In either event, the axially projecting ribs on the end faces of the impeller hub 18 act as baflies to preaffamati vent internal leakage past the hub and also reduce friction between the hub ends and the end walls of the impeller chamber, which are important features.

Although I have disclosed an exemplary embodimentl of my invention herein for purposes of illustration, it Will be understood that various changes, modifications and substitutions may be incorporated in such embodiment without necessarily departing from the spirit of the invention as delined by the claims appended hereto.

I claim as my invention:

1. A pump impeller having flexible elastomeric vanes which have neutral axes and the outer ends of which are bulbous when Viewed in a plane normal to the axis of rotation of said impeller, the centers of said bulbous outer ends being otset relative to the neutral axes of said vanes in a direction opposite to the direction of rotation of said impeller both when said vanes are flexed and when they are unexed.

2. In a pump, the combination of: a housing providing an impcller chamber and providing inlet and outlet ports which communicate with said chamber; a cam in said chamber between said ports; and an impeller concentrically located in said chamber and rotatable in a predetermined direction therein, said impeller having flexible elastomeric vanes which have neutral axes and the outer ends of which are engageable with the peripheral Wall of said impeller chamber and with said cam and are bulbous when viewed in a plane normal to. theI axis of rotation of said impeller, said vanes being flexed at least when said bulbous outer ends are in engagement with said cam, the centers of said bulbous outer ends being oset relative to the neutral axes of said vanes in a direction opposite to said direction of rotation of said impeller both when said vanes are lexed and when they are unliexed.

References Cited in the le of this patent UNITED STATES PATENTS 2,189,356 Briggs Feb. 6, 1940 2,258,371 Wernert Oct. 7, 194i 2,455,194 Rumsey Nov. 30, 1948 2,460,952 Simer et al. Feb. 8, 1949 2,466,440 Kiekhaefer Apr. 5, 1949 2,492,935 McCulloch et al. Dec. 27, 1949 2,499,163 Rand Feb. 28, 1950 2,542,268 Weyer Feb. 20, 1951 2,599,600 Arnold June l0, 1952 2,644,402 Lehman July 7, 1953 2,648,287 Thoren et al. Aug. 11, 1953 2,663,263 Mayus et al. Dec. 22, 1953 2,664,050 Abresch Dec. 29, 1953 FOREIGN PATENTS 244,826 Italy Feb. 27, 1926

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
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US2258371 *May 26, 1939Oct 7, 1941Karl WernertRotary piston machine with rotor of yieldable material
US2455194 *Nov 10, 1943Nov 30, 1948Gray Rumsey LillianRotary flexible vane pump
US2460952 *Jul 28, 1945Feb 8, 1949Paddle Pumps IncRotary pump with elastic rotor sealing rib
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US2492935 *Nov 22, 1943Dec 27, 1949Borg WarnerRotary blower with abrading rotor ends and abradable casing sealing ridges
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US2644402 *Oct 6, 1949Jul 7, 1953Lehman Irvin HSelf-sealing rotor for fluid transferring devices
US2648287 *Jun 15, 1949Aug 11, 1953Thompson Prod IncPump
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US2664050 *Mar 2, 1949Dec 29, 1953Gen Motors CorpDomestic appliance
IT244826B * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2855853 *Mar 14, 1956Oct 14, 1958Jabsco Pump CoPump with slotted cam
US2858769 *Aug 22, 1955Nov 4, 1958Jabsco Pump CoPump with sealed impeller hub
US2911920 *Aug 20, 1956Nov 10, 1959Thompson Samuel PPump with flexible impeller
US2933046 *Dec 26, 1956Apr 19, 1960Jabsco Pump CoPump with flexible impeller and flexible annular cam
US2974767 *May 26, 1958Mar 14, 1961Fulton Bertram ACombined pump and torque transmitting coupling
US3053190 *Apr 10, 1961Sep 11, 1962Minnesota Rubber CoRotary vane type positive displacement pump
US3054355 *Apr 25, 1961Sep 18, 1962Lord Mfg CoPump
US3169485 *Nov 1, 1963Feb 16, 1965Hypro Engineering IncPump construction
US3183842 *Nov 1, 1963May 18, 1965Hypro Engineering IncPump construction
US4411593 *Jun 25, 1980Oct 25, 1983Yamaha Hatsudoki Kabushiki KaishaRotary type pump resistant to muddy water
US4940402 *Nov 8, 1988Jul 10, 1990Brunswick CorporationHigh pressure and high lift pump impeller
US7841976Mar 23, 2007Nov 30, 2010Thoratec CorporationHeart assist device with expandable impeller pump
US7927068Apr 19, 2011Thoratec CorporationExpandable impeller pump
US7998054Sep 23, 2009Aug 16, 2011Thoratec CorporationImplantable heart assist system and method of applying same
US8118724Dec 4, 2007Feb 21, 2012Thoratec CorporationRotary blood pump
US8376707Feb 19, 2013Thoratec CorporationExpandable impeller pump
US8485961Jan 4, 2012Jul 16, 2013Thoratec CorporationImpeller housing for percutaneous heart pump
US8535211Jul 1, 2010Sep 17, 2013Thoratec CorporationBlood pump with expandable cannula
US8591393Jan 5, 2012Nov 26, 2013Thoratec CorporationCatheter pump
US8597170Jan 4, 2012Dec 3, 2013Thoratec CorporationCatheter pump
US8684902Dec 4, 2007Apr 1, 2014Thoratec CorporationRotary blood pump
US8684904Aug 15, 2013Apr 1, 2014Thoratec CorporationBlood pump with expandable cannula
US8721517Mar 13, 2013May 13, 2014Thoratec CorporationImpeller for catheter pump
US8992163Jan 11, 2013Mar 31, 2015Thoratec CorporationExpandable impeller pump
US9138518Jan 6, 2012Sep 22, 2015Thoratec CorporationPercutaneous heart pump
US9308302Mar 13, 2014Apr 12, 2016Thoratec CorporationCatheter pump assembly including a stator
US9327067May 13, 2013May 3, 2016Thoratec CorporationImpeller for catheter pump
US9358329Mar 13, 2013Jun 7, 2016Thoratec CorporationCatheter pump
US9364592Nov 12, 2010Jun 14, 2016The Penn State Research FoundationHeart assist device with expandable impeller pump
US9364593Sep 14, 2012Jun 14, 2016The Penn State Research FoundationHeart assist device with expandable impeller pump
US9381288Mar 11, 2014Jul 5, 2016Thoratec CorporationFluid handling system
US9421311Mar 13, 2013Aug 23, 2016Thoratec CorporationMotor assembly for catheter pump
US20070231135 *Mar 30, 2007Oct 4, 2007Orqis Medical CorporationRotary Blood Pump
US20080089797 *Dec 4, 2007Apr 17, 2008Wampler Richard KRotary Blood Pump
US20080095648 *Dec 4, 2007Apr 24, 2008Wampler Richard KRotary Blood Pump
US20080114339 *Mar 23, 2007May 15, 2008The Penn State Research FoundationHeart assist device with expandable impeller pump
US20090060743 *Jun 9, 2008Mar 5, 2009The Penn State Research FoundationExpandable impeller pump
US20100016960 *Sep 23, 2009Jan 21, 2010Bolling Steven FImplantable Heart Assist System And Method Of Applying Same
US20100135832 *Feb 3, 2010Jun 3, 2010Wampler Richard KRotary Blood Pump
US20110004046 *Jul 1, 2010Jan 6, 2011The Penn State Research FoundationBlood pump with expandable cannula
US20110236210 *Sep 29, 2011The Penn State Research FoundationExpandable impeller pump
EP1789314A2 *Sep 16, 2005May 30, 2007The Penn State Research FoundationExpandable impeller pump
Classifications
U.S. Classification418/154, 192/61
International ClassificationF04C5/00
Cooperative ClassificationF04C5/00
European ClassificationF04C5/00