US20030231959A1 - Impeller assembly for centrifugal pumps - Google Patents

Impeller assembly for centrifugal pumps Download PDF

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Publication number
US20030231959A1
US20030231959A1 US10/170,922 US17092202A US2003231959A1 US 20030231959 A1 US20030231959 A1 US 20030231959A1 US 17092202 A US17092202 A US 17092202A US 2003231959 A1 US2003231959 A1 US 2003231959A1
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US
United States
Prior art keywords
impeller
eye opening
impeller assembly
winglet
vane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/170,922
Inventor
Phillip Snider
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hackett William Franklin JR
Original Assignee
Hackett William Franklin JR
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hackett William Franklin JR filed Critical Hackett William Franklin JR
Priority to US10/170,922 priority Critical patent/US20030231959A1/en
Assigned to HACKETT, WILLIAM FRANKLIN JR. reassignment HACKETT, WILLIAM FRANKLIN JR. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SNIDER, PHILLIP
Publication of US20030231959A1 publication Critical patent/US20030231959A1/en
Application status is Abandoned legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00Priming; Preventing vapour lock
    • F04D9/02Self-priming pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/18Rotors
    • F04D29/22Rotors specially for centrifugal pumps
    • F04D29/2261Rotors specially for centrifugal pumps with special measures

Abstract

An impeller assembly for centrifugal pumps that enables self-priming in a relatively short time period includes an impeller and at least one winglet (e.g., six winglets with a trapezium cross-sectional shape). The impeller includes an impeller body with an eye opening therein. The eye opening is configured for the passage of a fluid (e.g., water) therethrough when the impeller assembly is in use. The impeller body also includes at least one vane, with a leading end, disposed about the eye opening. The at least one winglet is positioned to protrude into the eye opening of the impeller body and may, for example, be coupled to the leading end of the vane.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention [0001]
  • The present invention relates, in general, to pump assemblies and, in particular, to impeller assemblies for centrifugal pumps. [0002]
  • 2. Description of the Related Art [0003]
  • Centrifugal pumps are widely used in chemical, food, irrigation and other industries to pump a variety of liquids (e.g., water) and liquid-solid mixtures. Centrifugal pumps are a type of kinetic energy pump that imparts energy to a liquid through centrifugal force produced by a rotating impeller. The energy is used to increase the pressure of the liquid and move the liquid from one point to another. [0004]
  • FIG. 1 is a simplified cross-sectional depiction of a conventional centrifugal pump [0005] 10 that includes a stationary casing 12 and an impeller 14 with curved vanes 16 (also referred to as “blades” and shown as lines for simplicity) and an axially-disposed eye opening 18. Rotation of impeller 14, and thus curved vanes 16, (e.g., by a motor [not shown] operatively coupled to impeller 14) within stationary casing 12 reduces the pressure at eye opening 18 of the impeller, causing liquid to flow into eye opening 18 from a suction inlet (e.g., an intake pipe, not shown).
  • Curved vanes [0006] 16 are configured to accelerate and direct the liquid away from eye opening 18. Rotating curved vanes 16 of impeller 14 direct the liquid outward by centrifugal force, into stationary casing 12 and subsequently out a discharge exit 20. The accelerated outward flow of the liquid (i.e., from eye opening 18 towards stationary casing 12) reduces the pressure at eye opening 18, allowing more liquid to enter eye opening 18.
  • A drawback of centrifugal pumps is that they must be “primed” prior to use. “Priming” is the addition of liquid to the casing in order to displace (i.e., evacuate) any entrained air, create a liquid seal within the casing and, thereby, prepare the pump for the initiation of liquid flow therethrough. Although self-priming centrifugal pumps (i.e., a centrifugal pump that is configured to automatically remove [evacuate] air from the suction inlet and that may handle liquids, gases and liquid-gas mixtures) are known, the time period required to complete a self-priming process in such self-priming centrifugal pumps may be undesirably long. [0007]
  • Still needed in the field, therefore, is a self-priming centrifugal pump that may complete a self-priming process in a relatively short time period. In addition, the self-priming centrifugal pump should be or a relatively simple and easily manufactured structure. [0008]
  • BRIEF SUMMARY OF THE INVENTION
  • The present invention provides an impeller assembly for centrifugal pumps that enables self-priming in a relatively short time period. In addition, the impeller assembly is of a relatively simple and thus easily manufactured construction. [0009]
  • An impeller assembly for a centrifugal pump according to one exemplary embodiment of the present invention includes an impeller and at least one winglet. The impeller includes an impeller body with an eye opening therein. The eye opening is configured for the passage of a fluid (e.g., water) therethrough when the impeller assembly is in use. The impeller body also includes at least one vane, with a leading end, disposed about the eye opening. The winglet(s) are positioned to protrude into the eye opening of the impeller body and may, for example, be coupled to the leading end of the vane. [0010]
  • The provision of winglet(s) in the eye opening of impeller assemblies according to one exemplary embodiment of the present invention has been demonstrated to significantly reduce the time period required for a self-priming process when such impeller assemblies are used in centrifugal pumps. It is postulated, without being limiting, that this reduction is due to two effects. First, when in motion during use of the impeller assembly, the winglet(s) provide an air-foil-like dynamic with the eye opening that creates a vacuum-differential (also referred to as “lift”) effect. The vacuum differential (“lift”) effect enhances the evacuation of gas (e.g., air) from the centrifugal pump during a self-priming process. Second, moving winglet(s) serve to divide any gas bubbles (e.g., air bubbles) with which they come into contact into smaller gas bubbles. The smaller gas bubbles are more readily entrained in liquid passing through the centrifugal pump and, therefore, quickly evacuated from the centrifugal pump. [0011]
  • Furthermore, the inclusion of winglets in an impeller assembly according to one exemplary embodiment of the present invention results in simple and easily manufactured impeller assembly. [0012]
  • A better understanding of the features and advantages of the present invention will be obtained by reference to the following detailed description that sets forth illustrative embodiments, in which the principles of the invention are utilized, and the accompanying drawings[0013]
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a simplified cross-sectional depiction of a conventional centrifugal pump; [0014]
  • FIG. 2A is a simplified cross-sectional depiction of an impeller assembly according to one exemplary embodiment of the present invention; [0015]
  • FIG. 2B is a simplified cross-sectional depiction of the impeller assembly of FIG. 2A along line A-A. [0016]
  • FIG. 3 is a drawing depicting the cross-sectional shape of a winglet included in one embodiment of the present invention; and [0017]
  • FIGS. 4A, 4B and [0018] 4C are simplified left-side, edge and right-side depictions, respectively, of an impeller body included in one embodiment of the present invention.
  • DESCRIPTION OF PREFFERED EXEMPLARY EMBODIMENTS
  • FIGS. 2A and 2B are simplified depictions of an impeller assembly [0019] 100 for use in a centrifugal pump in accordance with one exemplary embodiment of the present invention. Impeller assembly 100 includes an impeller 102 and six winglets 104 (shown in cross-section in FIG. 3). Impeller 102 includes a first impeller body 106 with an eye opening 108 therein, a second impeller body 110 (through which eye opening 108 also passes) and a keyway 112. Eye opening 108 is configured for the passage of fluid (e.g., water) therethrough when impeller assembly 100 is in use in a centrifugal pump.
  • Winglets [0020] 104 are configured to protrude within eye opening 108 (see, for example, FIG. 2B) of impeller 102 and are also configured for movement in a predetermined pattern (e.g., the circular pattern indicated by arrow A of FIGS. 2B and 3) when impeller assembly 100 is in use in a centrifugal pump.
  • Referring to FIGS. [0021] 4A-4C, first impeller body 106 includes six curved vanes 114 disposed within eye opening 108. Each of the curved vanes 114 has a leading edge 116 that is located proximal to eye opening 108. First impeller body 106, curved vanes 114 and winglets 104 may be formed of any suitable material known to one skilled in the art including, but not limited to, PET white plastic.
  • In the embodiment of FIGS. 2A, 2B, and [0022] 4A-4C, a winglet 104 is coupled to the leading edge 116 of each curved vane 114 by, for example, being formed as a unitary whole with curved vanes 114 of first impeller body 106. Preferably, each winglet 104 is machine or molded as a solid part of a corresponding impeller vane but may also be a separate piece coupled appropriately, as one skilled in the art will understand, to a corresponding leading edge. Therefore, when first impeller body 106 and curved vanes 114 are rotated (e.g., at a rotation speed in the range of 10 rpm to 3,500 rpm), winglets 104 move in a circular pattern within eye opening 108.
  • Preferably, entrance vane angles are selected from a chart provided in various engineering books, such as, for example, “The Pump Hand Book.” Such a chart allows one skilled in the art to select a preferred vane entrance angle using desired impeller efficiency and impeller specific speed. [0023]
  • Winglets [0024] 104 are configured to operate as rudimentary wings (i.e., airfoils) during movement in the predetermined pattern. This airfoil characteristic of winglets 104 is illustrated in FIG. 3. Winglets 104 have a trapezium (either quadrilateral or trapezoidal) cross-sectional shape and may be considered to possess a “top” side 200 and a “bottom” side 202. Thus, winglets 104 substantially fill corresponding vanes 114 as may be seen in FIG. 4C and therefore the trapezium shape is preferable. The dimensions of sides 200, 202 are likewise selected to substantially fill vanes 114. Once apprised of the present disclosure, one skilled in the art will recognize that other winglets of other cross-sectional shapes may be employed such as, for example, triangular or oblong cross-sectional shapes.
  • When a fluid (e.g., water or air) flows past winglet [0025] 104 it travels farther along top side 200 than over bottom side 202 (as illustrated by the dashed arrows of FIG. 3) creating a vacuum differential or lift effect within eye opening 108. This effect facilitates evacuation of gas from a centrifugal pump during a self-priming process. In addition, the movement of winglet 104 serves to divide (i.e., break-up) large air bubbles into smaller gas bubbles that are more readily mixed with liquid and evacuated during a self-priming process.
  • The provision of winglet(s) that protrude into the eye opening of impeller assemblies according to one exemplary embodiment of the present invention has been demonstrated to significantly reduce the time period required for self-priming processes. For example, test results indicate that a conventional self-priming centrifugal pump that required five minutes to complete self-priming when pumping water required only thirty seconds when winglets were provided in the eye opening of the centrifugal pump. [0026]
  • It should be understood that various alternatives to the embodiments of the invention described herein may be employed in practicing the invention. It is intended that the following claims define the scope of the invention and that structures within the scope of these claims and their equivalents be covered thereby. [0027]

Claims (10)

What is claimed is:
1. An impeller assembly for a centrifugal pump, the impeller assembly comprising:
an impeller, the impeller including:
an impeller body with an eye opening therein, the eye opening configured for the passage of a fluid therethrough when the impeller assembly is in use;
at least one vane disposed about the eye opening, the at least one vane having a leading end; and
at least one winglet positioned to protrude into the eye opening of the impeller body.
2. The impeller assembly of claim 1, wherein a cross-section of the winglet is trapezoidal in shape.
3. The impeller assembly of claim 1, wherein a cross-section of the winglet is triangular in shape.
4. The impeller assembly of claim 1, wherein a cross-section of the winglet is oblong in shape.
5. The impeller assembly of claim 1, wherein the impeller body and winglet are configured as a unitary whole.
6. The impeller assembly of claim 5, wherein the at least one winglet is coupled to the leading edge of the at least one vane.
7. The impeller assembly of claim 6, wherein there are six vanes and six winglets and each of the six winglets is coupled to a leading edge of a different vane.
8. The impeller assembly of claim 1, wherein the impeller assembly is configured for use in a self-priming centrifugal pump.
9. An impeller assembly for a centrifugal pump, the impeller assembly comprising:
a rotatable impeller, the impeller including:
an impeller body with an eye opening therein, the eye opening configured for the passage of a fluid therethrough when the impeller assembly is in use;
at least one vane disposed about the eye opening, the at least one vane having a leading end; and
at least one winglet coupled to the leading edge of the at least one vane and positioned to protrude into the eye opening of the impeller.
10. The impeller assembly of claim 9, wherein there are six vanes and six winglets.
US10/170,922 2002-06-12 2002-06-12 Impeller assembly for centrifugal pumps Abandoned US20030231959A1 (en)

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Cited By (51)

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US20070147999A1 (en) * 2005-12-28 2007-06-28 Elliott Company Impeller
US7393181B2 (en) 2004-09-17 2008-07-01 The Penn State Research Foundation Expandable impeller pump
US7841976B2 (en) 2006-03-23 2010-11-30 Thoratec Corporation Heart assist device with expandable impeller pump
US7998054B2 (en) 1997-10-09 2011-08-16 Thoratec Corporation Implantable heart assist system and method of applying same
US8118724B2 (en) 2003-09-18 2012-02-21 Thoratec Corporation Rotary blood pump
US8485961B2 (en) 2011-01-05 2013-07-16 Thoratec Corporation Impeller housing for percutaneous heart pump
US8535211B2 (en) 2009-07-01 2013-09-17 Thoratec Corporation Blood pump with expandable cannula
US8591393B2 (en) 2011-01-06 2013-11-26 Thoratec Corporation Catheter pump
US8597170B2 (en) 2011-01-05 2013-12-03 Thoratec Corporation Catheter pump
US8721517B2 (en) 2012-05-14 2014-05-13 Thoratec Corporation Impeller for catheter pump
US8900060B2 (en) 2009-04-29 2014-12-02 Ecp Entwicklungsgesellschaft Mbh Shaft arrangement having a shaft which extends within a fluid-filled casing
US8926492B2 (en) 2011-10-11 2015-01-06 Ecp Entwicklungsgesellschaft Mbh Housing for a functional element
US8932141B2 (en) 2009-10-23 2015-01-13 Ecp Entwicklungsgesellschaft Mbh Flexible shaft arrangement
US8944748B2 (en) 2009-05-05 2015-02-03 Ecp Entwicklungsgesellschaft Mbh Fluid pump changeable in diameter, in particular for medical application
US8979493B2 (en) 2009-03-18 2015-03-17 ECP Entwicklungsgesellscaft mbH Fluid pump
US8998792B2 (en) 2008-12-05 2015-04-07 Ecp Entwicklungsgesellschaft Mbh Fluid pump with a rotor
US9028216B2 (en) 2009-09-22 2015-05-12 Ecp Entwicklungsgesellschaft Mbh Rotor for an axial flow pump for conveying a fluid
US9067006B2 (en) 2009-06-25 2015-06-30 Ecp Entwicklungsgesellschaft Mbh Compressible and expandable blade for a fluid pump
US9089670B2 (en) 2009-02-04 2015-07-28 Ecp Entwicklungsgesellschaft Mbh Catheter device having a catheter and an actuation device
US9089634B2 (en) 2009-09-22 2015-07-28 Ecp Entwicklungsgesellschaft Mbh Fluid pump having at least one impeller blade and a support device
US9138518B2 (en) 2011-01-06 2015-09-22 Thoratec Corporation Percutaneous heart pump
US9217442B2 (en) 2010-03-05 2015-12-22 Ecp Entwicklungsgesellschaft Mbh Pump or rotary cutter for operation in a fluid
US9308302B2 (en) 2013-03-15 2016-04-12 Thoratec Corporation Catheter pump assembly including a stator
US9314558B2 (en) 2009-12-23 2016-04-19 Ecp Entwicklungsgesellschaft Mbh Conveying blades for a compressible rotor
US9327067B2 (en) 2012-05-14 2016-05-03 Thoratec Corporation Impeller for catheter pump
US9328741B2 (en) 2010-05-17 2016-05-03 Ecp Entwicklungsgesellschaft Mbh Pump arrangement
US9339596B2 (en) 2009-12-23 2016-05-17 Ecp Entwicklungsgesellschaft Mbh Radially compressible and expandable rotor for a fluid pump
US9358329B2 (en) 2012-07-03 2016-06-07 Thoratec Corporation Catheter pump
US9358330B2 (en) 2009-12-23 2016-06-07 Ecp Entwicklungsgesellschaft Mbh Pump device having a detection device
US9381288B2 (en) 2013-03-13 2016-07-05 Thoratec Corporation Fluid handling system
US9416783B2 (en) 2009-09-22 2016-08-16 Ecp Entwicklungsgellschaft Mbh Compressible rotor for a fluid pump
US9416791B2 (en) 2010-01-25 2016-08-16 Ecp Entwicklungsgesellschaft Mbh Fluid pump having a radially compressible rotor
US9421311B2 (en) 2012-07-03 2016-08-23 Thoratec Corporation Motor assembly for catheter pump
US9446179B2 (en) 2012-05-14 2016-09-20 Thoratec Corporation Distal bearing support
US9512852B2 (en) 2006-03-31 2016-12-06 Thoratec Corporation Rotary blood pump
US9603983B2 (en) 2009-10-23 2017-03-28 Ecp Entwicklungsgesellschaft Mbh Catheter pump arrangement and flexible shaft arrangement having a core
US9611743B2 (en) 2010-07-15 2017-04-04 Ecp Entwicklungsgesellschaft Mbh Radially compressible and expandable rotor for a pump having an impeller blade
US9675738B2 (en) 2015-01-22 2017-06-13 Tc1 Llc Attachment mechanisms for motor of catheter pump
US9675739B2 (en) 2015-01-22 2017-06-13 Tc1 Llc Motor assembly with heat exchanger for catheter pump
US9771801B2 (en) 2010-07-15 2017-09-26 Ecp Entwicklungsgesellschaft Mbh Rotor for a pump, produced with a first elastic material
US9770543B2 (en) 2015-01-22 2017-09-26 Tc1 Llc Reduced rotational mass motor assembly for catheter pump
US9827356B2 (en) 2014-04-15 2017-11-28 Tc1 Llc Catheter pump with access ports
US9867916B2 (en) 2010-08-27 2018-01-16 Berlin Heart Gmbh Implantable blood conveying device, manipulating device and coupling device
US9872947B2 (en) 2012-05-14 2018-01-23 Tc1 Llc Sheath system for catheter pump
US9895475B2 (en) 2010-07-15 2018-02-20 Ecp Entwicklungsgesellschaft Mbh Blood pump for the invasive application within a body of a patient
US9907890B2 (en) 2015-04-16 2018-03-06 Tc1 Llc Catheter pump with positioning brace
US9974893B2 (en) 2010-06-25 2018-05-22 Ecp Entwicklungsgesellschaft Mbh System for introducing a pump
US10029037B2 (en) 2014-04-15 2018-07-24 Tc1 Llc Sensors for catheter pumps
US10105475B2 (en) 2014-04-15 2018-10-23 Tc1 Llc Catheter pump introducer systems and methods
US10107299B2 (en) 2009-09-22 2018-10-23 Ecp Entwicklungsgesellschaft Mbh Functional element, in particular fluid pump, having a housing and a conveying element
US10172985B2 (en) 2009-08-06 2019-01-08 Ecp Entwicklungsgesellschaft Mbh Catheter device having a coupling device for a drive device

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US7998054B2 (en) 1997-10-09 2011-08-16 Thoratec Corporation Implantable heart assist system and method of applying same
US8118724B2 (en) 2003-09-18 2012-02-21 Thoratec Corporation Rotary blood pump
US8684902B2 (en) 2003-09-18 2014-04-01 Thoratec Corporation Rotary blood pump
US7393181B2 (en) 2004-09-17 2008-07-01 The Penn State Research Foundation Expandable impeller pump
US9364593B2 (en) 2004-09-17 2016-06-14 The Penn State Research Foundation Heart assist device with expandable impeller pump
US7927068B2 (en) 2004-09-17 2011-04-19 Thoratec Corporation Expandable impeller pump
US8992163B2 (en) 2004-09-17 2015-03-31 Thoratec Corporation Expandable impeller pump
US8376707B2 (en) 2004-09-17 2013-02-19 Thoratec Corporation Expandable impeller pump
US10215187B2 (en) 2004-09-17 2019-02-26 Tc1 Llc Expandable impeller pump
US9364592B2 (en) 2004-09-17 2016-06-14 The Penn State Research Foundation Heart assist device with expandable impeller pump
US9717833B2 (en) 2004-09-17 2017-08-01 The Penn State Research Foundation Heart assist device with expandable impeller pump
US7628586B2 (en) 2005-12-28 2009-12-08 Elliott Company Impeller
US20070147999A1 (en) * 2005-12-28 2007-06-28 Elliott Company Impeller
US7841976B2 (en) 2006-03-23 2010-11-30 Thoratec Corporation Heart assist device with expandable impeller pump
US10149932B2 (en) 2006-03-23 2018-12-11 The Penn State Research Foundation Heart assist device with expandable impeller pump
US9512852B2 (en) 2006-03-31 2016-12-06 Thoratec Corporation Rotary blood pump
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