US3644056A - Centrifugal pump - Google Patents

Centrifugal pump Download PDF

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Publication number
US3644056A
US3644056A US3644056DA US3644056A US 3644056 A US3644056 A US 3644056A US 3644056D A US3644056D A US 3644056DA US 3644056 A US3644056 A US 3644056A
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United States
Prior art keywords
axis
impeller
base point
respect
point
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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.)
Expired - Lifetime
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Samuel I Wiselius
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Koninklijke Machinefabriek Stork BV
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Koninklijke Machinefabriek Stork BV
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Publication of US3644056A publication Critical patent/US3644056A/en
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    • 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
    • F04D29/2277Rotors specially for centrifugal pumps with special measures for increasing NPSH or dealing with liquids near boiling-point

Abstract

A centrifugal pump comprising a vaned impeller which has an axial inlet wherein the impeller vanes at the inlet end are extend in the normal direction of rotation of the impeller and in the axial direction, the extension from that end of the inlet edge adjacent the impeller hub, to the other end thereof gradually increasing from zero to a maximum value, and the total extension with respect to an axial plane through that end of the inlet edge which is adjacent the hub covering an arc length equivalent to an angle of between 30* and 180*.

Description

United States atent Wiselius 1 CENTRIFUGAL PUMP [72] Inventor: Samuel 1. Wiselius, l-lengelo, Netherlands [73] Assignee: Koninkliike Machinefabriek Stork N.V.,

'l-lengelo, Netherlands [22] Filed: Mar.t6, 1970 [21] App1.No.: 17,135

[52] U,S.Cl. ..415/215,415/72,415/143,

[51] Int. Cl ..F04d 7/01) [58] Field otsearch ..415/71,72,77,143,215; 416/176,179, 180-188 [56] References Cited UNlTED STATES PATENTS 2,276,827 3/1942 Damonte ..415/215 1 Feb. 22, 1972 1,831,218 11/1931 Winter et al. ..415/143 2,483,335 9/1949 Davis ..415/215 3,280,748 10/ 1966 Ogles ..416/188 Primary Examiner-C. .l. l-lusar Attarneylmirie, Smiley, Snyder and Butrum [57] ABSTRACT 2 Claims, 3 Drawing Figures PATENTEDFEBZZ 1912 3,644,056

' sum 1 or 2 l N VEN TOR ATTORNEY INVENTOR ATTORNEY CENTRIFUGAL PUMP The invention relates to a centrifugal pump comprising a vaned impeller which has an axial inlet and which is mounted in a casing, the inlet edge of said vanes being situated entirely in front of a plane which passes through that end of the inlet edge which is adjacent the impeller of and which is perpendicular to the impeller shaft. the

According to the invention the impeller vanes are extended in the normal direction of rotation of the impeller and in the axial direction, at the inlet side with respect to the inlet edge as the latter would be determined by the required capacity of the pump, is the extension from that end short term the inlet edge of the vane which is adjacent the impeller hub, to scales other end thereof gradually increasing from zero to a maximum value, and is the total extension with respect to an axial plane through that end of the inlet edge which is adjacent the hub covering an arc length equivalent to an angle of between 30 and 180.

As a result of the extension of the front edge of the vane, such extension being maximum at the outer periphery of the axial inlet, the incoming liquid comes into contact with the inlet edge of the vanes at a much smaller angle than 90. It has been found that even a relatively small extension gives the required effect. This reduces any difficulties in connection with the manufacture of the impeller and it has also surprisingly been found that no vibration occurs. Since the extension can be relatively small, there is also a relatively small increase in the vane area so that the extension does not reduce the efficiency of the pump to any appreciable extent.

As is described above the said extension of the vanes would not be required to achieve the desired pump characteristic.

The invention can be applied to various types of centrifugal pump. For example, the outlet direction of the flow may be radial, semiaxial/semiradial, or axial. The impeller may be either open or closed, i.e., provided with a front plate which is secured to and corotates with the vanes.

The invention will be explained in detail in the following description with reference to one exemplified embodiment and the drawing.

FIG. 1 illustrates an impeller of a pump according to the invention in axial view from the inlet side;

FIG. 2 is a cross section of which a number of axial cross sections in various planes between the beginning and the end of the vane are projected on one another in the drawing plane;

FIG. 3 is a perspective view weighing an impeller. fedder the number 1 The impeller illustrated in the drawing comprises a backplate 3 which is secured by a hub 2 on a shaft 1, the vanes being secured to the plate 3. For the sake of clarity, FIG. 1 illustrates only one vane 4 completely. The end of a vane 5 is also indicated to show the spacing between the various vanes. The impeller inlet is denoted by reference 6; in FIG. 1, the maximum diameter of this inlet is shown by the broken line 7. The connection between the vane and the backplate 3 is indicated by the line 8. The edge of the vane which cooperates with the casing for sealing purpose is denoted by reference 9. The end point of the line 8 at the base point 10 and the end point of the line 9 at the tip point 11 indicate the boundary points of the inlet edge 12 of the vane 4. The exit edge of the vane 4 is at 13. The broken line 14 shows how the inlet edge of the vane 4 would be if it were dimensioned in the normal way to obtain a required pump characteristic. With respect to the construction having the inlet edge 14, the vane has an extension piece 15 past the axial plane which in FIG. 1 intersects the vane 4 as shown by the dot-dash line 16. This plane passes through the base point 10, i.e., that end of the inlet edge 12 which is situated on the smallest diameter, and in FIG. 3 it is defined by the centerline of the shaft 1 and radial lines 17 and 18. The line 17 is situated in the plane perpendicular to the shaft 1 and extending through the base point 10, while the line 18 is situated in a correspondingly disposed plane passing through the tip point 11. The extension covers an angle a. De-

pendin upon conditions, the anglea will be between 30 and s a result of the extension with the part 15 which extends in the normal direction of rotation of the impeller the speed of the incoming liquid coming into contact with the leading edge rotating at high speed will be such, with respect to the said leading edge 12, that one component will extend along the leading edge and one component will extend perpendicular to said edge. The absolute value of the component extending perpendicularly to the leading edge is much smaller than the absolute value of the actual speed of the liquid with respect to the leading edge of the vane. This greatly reduces any risk of cavitation.

In a preferred embodiment the angle a has a value of Then the angle between the leading edge of the vane and the actual direction of the liquid is 30. The absolute value of the component of the speed extending perpendicular to the leading edge is then one-half of the absolute value of the actual speed of the liquid with respect to the leading edge of the vane. The decrease in pressure as a result of the speed of the liquid in this circumstances is only one-fourth of the decrease which would be the result if the actual speed of the liquid would extent perpendicular to the leading edge.

FIG. 2 illustrates each point of the impeller in the same plane of the drawings. Each point of the impeller has been drawn in a plane extending through the shaft, all said planes being rotated until they are situated in the drawing plane. This figure therefore shows how the various points of the vanes are situated axially with respect to one another.

What I claim is:

1. In a centrifugal pump having a drive shaft, a hub assembly fixed to said drive shaft for rotation therewith about the axis of said drive shaft, and a plurality of impeller vanes on said hub assembly, each impeller vane having a main body joined to said hub assembly along a line curving inwardly with respect to said axis and terminating at a base point spaced radially outwardly of said axis, the main body of each impeller vane also having an outer edge curving inwardly with respect to said axis and terminating in a tip point spaced radially outwardly from said axis and axially outwardly of said base point with there being an inner, inlet edge extending between said tip point and said base point, said outer edge being contoured to sweep in closely spaced relation of an associated portion of the pump casing, the improvement wherein:

said tip point is located circumferentially beyond said base point with respect to the direction of rotation of said shaft such that planes containing said axis and said base point and said tip point respectively include an angle having a value between 30 and 2. In a centrifugal pump as defined in claim 1 wherein said angle is 90".

Claims (2)

1. In a centrifugal pump having a drive shaft, a hub assembly fixed to said drive shaft for rotation therewith about the axis of said drive shaft, and a plurality of impeller vanes on said hub assembly, each impeller vane having a main body joined to said hub assembly along a line curving inwardly with respect to said axis and terminating at a base point spaced radially outwardly of said axis, the main body of each impeller vane also having an outer edge curving inwardly with respect to said axis and terminating in a tip point spaced radially outwardly from said axis and axially outwardly of said base point with there being an inner, inlet edge extending between said tip point and said base point, said outer edge being contoured to sweep in closely spaced relation of an associated portion of the pump casing, the improvement wherein: said tip point is located circumferentially beyond said base point with respect to the direction of rotation of saId shaft such that planes containing said axis and said base point and said tip point respectively include an angle having a value between 30* and 180*.
2. In a centrifugal pump as defined in claim 1 wherein said angle is 90*.
US3644056D 1970-03-06 1970-03-06 Centrifugal pump Expired - Lifetime US3644056A (en)

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Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3737249A (en) * 1970-08-26 1973-06-05 Trw Inc High flow pump impeller for low net positive suction head and method of designing same
US3953150A (en) * 1972-02-10 1976-04-27 Sundstrand Corporation Impeller apparatus
EP0011506A1 (en) * 1978-11-17 1980-05-28 Spp Group Limited Single vane rotodynamic impeller
US4456424A (en) * 1981-03-05 1984-06-26 Toyo Denki Kogyosho Co., Ltd. Underwater sand pump
US4594052A (en) * 1982-02-08 1986-06-10 A. Ahlstrom Osakeyhtio Centrifugal pump for liquids containing solid material
US4648796A (en) * 1983-07-06 1987-03-10 Pompe F.B.M. S.P.A. Centrifugal pump for very thick and/or viscous materials and products
US4708593A (en) * 1986-02-28 1987-11-24 Robinson Industries, Inc. Surgeless combustion air blower
EP0359445A2 (en) * 1988-09-16 1990-03-21 Nnc Limited Impeller pumps
US5108257A (en) * 1989-05-26 1992-04-28 Pacific Machinery & Engineering Co., Ltd. Impeller for turbo pump for water jet propulsion machinery, and turbo pump including same impeller
US5730582A (en) * 1997-01-15 1998-03-24 Essex Turbine Ltd. Impeller for radial flow devices
WO2000057056A2 (en) * 1999-03-22 2000-09-28 David Muhs Pump assembly and related components
US6135710A (en) * 1996-10-02 2000-10-24 Jms Co., Ltd. Turbo blood pump
US6142736A (en) * 1997-11-18 2000-11-07 Itt Manufacturing Enterprises, Inc. Pump impeller
US6158959A (en) * 1997-11-18 2000-12-12 Itt Manufacturing Enterprises, Inc. Pump impeller
EP1135611A1 (en) * 1998-12-04 2001-09-26 Warman International Limited Improvements relating to froth pumps
US6315524B1 (en) 1999-03-22 2001-11-13 David Muhs Pump system with vacuum source
WO2001090537A1 (en) * 2000-05-24 2001-11-29 Ingersoll-Rand Energy Systems Corporation Fish-friendly turbine
WO2002031361A1 (en) * 2000-10-09 2002-04-18 Allweiler Ag Centrifugal wheel pump
US6390768B1 (en) 1999-03-22 2002-05-21 David Muhs Pump impeller and related components
US6405748B1 (en) 1999-03-22 2002-06-18 David Muhs Trailer and fuel tank assembly
US6692234B2 (en) 1999-03-22 2004-02-17 Water Management Systems Pump system with vacuum source
US20070258824A1 (en) * 2005-02-01 2007-11-08 1134934 Alberta Ltd. Rotor for viscous or abrasive fluids
US20080175723A1 (en) * 2007-01-19 2008-07-24 Water Management Systems Vacuum pump with wear adjustment
US20080175722A1 (en) * 2007-01-19 2008-07-24 David Muhs Vacuum pump with wear adjustment
US20090226312A1 (en) * 2008-03-07 2009-09-10 Delta Electonics, Inc. Fan and fan frame thereof
US20110027076A1 (en) * 2009-08-03 2011-02-03 Ebara International Corporation Counter Rotation Inducer Housing
US20110027071A1 (en) * 2009-08-03 2011-02-03 Ebara International Corporation Multi-stage inducer for centrifugal pumps
US20110044827A1 (en) * 2009-08-24 2011-02-24 David Muhs Self priming pump assembly with a direct drive vacuum pump
US20110123321A1 (en) * 2009-08-03 2011-05-26 Everett Russell Kilkenny Inducer For Centrifugal Pump
US20160312790A1 (en) * 2013-12-31 2016-10-27 Ningbo Fotile Kitchen Ware Co.,Ltd Open water pump
US9631622B2 (en) 2009-10-09 2017-04-25 Ebara International Corporation Inducer for centrifugal pump
US20180112673A1 (en) * 2015-04-15 2018-04-26 Sulzer Management Ag Impeller for a centrifugal headbox feed pump
US20180142691A1 (en) * 2016-11-23 2018-05-24 Eddy Pump Corporation Eddy Pump Impeller

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1831218A (en) * 1927-11-07 1931-11-10 Ireal A Winter Flow indicator for hydraulic turbines
US2276827A (en) * 1941-02-18 1942-03-17 John P Damonte Pump
US2483335A (en) * 1947-06-30 1949-09-27 Jessie A Davis Foundation Inc Pump
US3280748A (en) * 1963-11-07 1966-10-25 Moe Pump Co Centrifugal pump with adjustable impeller

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1831218A (en) * 1927-11-07 1931-11-10 Ireal A Winter Flow indicator for hydraulic turbines
US2276827A (en) * 1941-02-18 1942-03-17 John P Damonte Pump
US2483335A (en) * 1947-06-30 1949-09-27 Jessie A Davis Foundation Inc Pump
US3280748A (en) * 1963-11-07 1966-10-25 Moe Pump Co Centrifugal pump with adjustable impeller

Cited By (58)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3737249A (en) * 1970-08-26 1973-06-05 Trw Inc High flow pump impeller for low net positive suction head and method of designing same
US3953150A (en) * 1972-02-10 1976-04-27 Sundstrand Corporation Impeller apparatus
EP0011506A1 (en) * 1978-11-17 1980-05-28 Spp Group Limited Single vane rotodynamic impeller
WO1980001095A1 (en) * 1978-11-17 1980-05-29 G Lake Single vane rotodynamic impeller
US4456424A (en) * 1981-03-05 1984-06-26 Toyo Denki Kogyosho Co., Ltd. Underwater sand pump
US4594052A (en) * 1982-02-08 1986-06-10 A. Ahlstrom Osakeyhtio Centrifugal pump for liquids containing solid material
US4648796A (en) * 1983-07-06 1987-03-10 Pompe F.B.M. S.P.A. Centrifugal pump for very thick and/or viscous materials and products
US4708593A (en) * 1986-02-28 1987-11-24 Robinson Industries, Inc. Surgeless combustion air blower
EP0359445A2 (en) * 1988-09-16 1990-03-21 Nnc Limited Impeller pumps
EP0359445A3 (en) * 1988-09-16 1990-05-09 Nnc Limited Impeller pumps
US5100295A (en) * 1988-09-16 1992-03-31 Nnc Limited Impeller pumps
US5108257A (en) * 1989-05-26 1992-04-28 Pacific Machinery & Engineering Co., Ltd. Impeller for turbo pump for water jet propulsion machinery, and turbo pump including same impeller
US6135710A (en) * 1996-10-02 2000-10-24 Jms Co., Ltd. Turbo blood pump
US5730582A (en) * 1997-01-15 1998-03-24 Essex Turbine Ltd. Impeller for radial flow devices
AU733143B2 (en) * 1997-11-18 2001-05-10 Itt Manufacturing Enterprises, Inc. A pump impeller
US6142736A (en) * 1997-11-18 2000-11-07 Itt Manufacturing Enterprises, Inc. Pump impeller
US6158959A (en) * 1997-11-18 2000-12-12 Itt Manufacturing Enterprises, Inc. Pump impeller
CZ300400B6 (en) * 1998-12-04 2009-05-13 Weir Minerals Australia Ltd. Pump impeller and pump having such an impeller
US6619910B1 (en) 1998-12-04 2003-09-16 Warman International Limited Froth pumps
EP1135611A1 (en) * 1998-12-04 2001-09-26 Warman International Limited Improvements relating to froth pumps
EP1135611A4 (en) * 1998-12-04 2002-09-11 Warman Int Ltd Improvements relating to froth pumps
US7794211B2 (en) 1999-03-22 2010-09-14 Water Management Systems Pump System with a vacuum source coupled to a separator
US8662862B2 (en) 1999-03-22 2014-03-04 Water Management Systems, LLC Pump system with vacuum source
US6390768B1 (en) 1999-03-22 2002-05-21 David Muhs Pump impeller and related components
US6405748B1 (en) 1999-03-22 2002-06-18 David Muhs Trailer and fuel tank assembly
US6315524B1 (en) 1999-03-22 2001-11-13 David Muhs Pump system with vacuum source
US6585492B2 (en) 1999-03-22 2003-07-01 David Muhs Pump system with vacuum source
WO2000057056A3 (en) * 1999-03-22 2001-01-11 David Muhs Pump assembly and related components
US6692234B2 (en) 1999-03-22 2004-02-17 Water Management Systems Pump system with vacuum source
WO2000057056A2 (en) * 1999-03-22 2000-09-28 David Muhs Pump assembly and related components
AU776504B2 (en) * 1999-03-22 2004-09-09 David Muhs Pump assembly and related components
US7011505B2 (en) 1999-03-22 2006-03-14 Water Management Systems Pump system with vacuum source
US8246316B2 (en) 1999-03-22 2012-08-21 David Muhs Vacuum source and float valve for a self-priming pump
US7311335B2 (en) 1999-03-22 2007-12-25 Water Management Systems Trailer and fuel tank assembly
US20110008183A1 (en) * 1999-03-22 2011-01-13 David Muhs Pump system with vacuum source
US20040120828A1 (en) * 1999-03-22 2004-06-24 David Muhs Pump system with vacuum source
WO2001090537A1 (en) * 2000-05-24 2001-11-29 Ingersoll-Rand Energy Systems Corporation Fish-friendly turbine
WO2002031361A1 (en) * 2000-10-09 2002-04-18 Allweiler Ag Centrifugal wheel pump
US20070258824A1 (en) * 2005-02-01 2007-11-08 1134934 Alberta Ltd. Rotor for viscous or abrasive fluids
US20080175722A1 (en) * 2007-01-19 2008-07-24 David Muhs Vacuum pump with wear adjustment
US20080175723A1 (en) * 2007-01-19 2008-07-24 Water Management Systems Vacuum pump with wear adjustment
US7878768B2 (en) 2007-01-19 2011-02-01 David Muhs Vacuum pump with wear adjustment
US20090226312A1 (en) * 2008-03-07 2009-09-10 Delta Electonics, Inc. Fan and fan frame thereof
US8240989B2 (en) * 2008-03-07 2012-08-14 Delta Electronics, Inc. Fan
US8550771B2 (en) * 2009-08-03 2013-10-08 Ebara International Corporation Inducer for centrifugal pump
US20110027071A1 (en) * 2009-08-03 2011-02-03 Ebara International Corporation Multi-stage inducer for centrifugal pumps
US20110123321A1 (en) * 2009-08-03 2011-05-26 Everett Russell Kilkenny Inducer For Centrifugal Pump
US20110027076A1 (en) * 2009-08-03 2011-02-03 Ebara International Corporation Counter Rotation Inducer Housing
US8506236B2 (en) 2009-08-03 2013-08-13 Ebara International Corporation Counter rotation inducer housing
US8998586B2 (en) 2009-08-24 2015-04-07 David Muhs Self priming pump assembly with a direct drive vacuum pump
US20110044827A1 (en) * 2009-08-24 2011-02-24 David Muhs Self priming pump assembly with a direct drive vacuum pump
US9631622B2 (en) 2009-10-09 2017-04-25 Ebara International Corporation Inducer for centrifugal pump
US10527053B2 (en) * 2013-12-31 2020-01-07 Ningbo Fotile Kitchen Ware Co., Ltd. Open water pump
US20160312790A1 (en) * 2013-12-31 2016-10-27 Ningbo Fotile Kitchen Ware Co.,Ltd Open water pump
US20180112673A1 (en) * 2015-04-15 2018-04-26 Sulzer Management Ag Impeller for a centrifugal headbox feed pump
US10247195B2 (en) * 2015-04-15 2019-04-02 Sulzer Management Ag Impeller for a centrifugal headbox feed pump
US20180142691A1 (en) * 2016-11-23 2018-05-24 Eddy Pump Corporation Eddy Pump Impeller
US10480524B2 (en) * 2016-11-23 2019-11-19 Eddy Pump Corporation Eddy pump impeller

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