US2272469A - Centrifugal pump - Google Patents

Centrifugal pump Download PDF

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Publication number
US2272469A
US2272469A US310673A US31067339A US2272469A US 2272469 A US2272469 A US 2272469A US 310673 A US310673 A US 310673A US 31067339 A US31067339 A US 31067339A US 2272469 A US2272469 A US 2272469A
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United States
Prior art keywords
impeller
heel
blade
blades
velocity
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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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US310673A
Inventor
William H Lannert
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Chicago Pump Co
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Chicago Pump Co
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Publication date
Application filed by Chicago Pump Co filed Critical Chicago Pump Co
Priority to US310673A priority Critical patent/US2272469A/en
Application granted granted Critical
Publication of US2272469A publication Critical patent/US2272469A/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

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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
    • F04D29/2238Special flow patterns
    • F04D29/225Channel wheels, e.g. one blade or one flow channel

Description

Feb. 10, 1942. I w. H. LANNERf 2,272,469

dENTRIFueAL PUMP Filed Dec. 25, 1939 INVENTOR.

ATTORNEY.

Patented Feb. 10, 194;

UNITED. "STATES amass tion of- Illinois Application December 23, 1939. Serial No. 310, 73

2 Claims. (Cl. 103-103) a from a suitable source of power such as an 'elec- This inventionrelates to centrifugal pumps of that type which are employed for pumping sewage and other' liquids containing solids such as paper, rags, stringy substances, trash and other semi-solids. Considerable difficulty has been encountered in centrifugal pumps of this typebecause of the likelihood of the rags, paperand other stringy material lodging on. or clinging to the heel of the impeller blade in such quantities as to interfere with the operation of the pump and sometimes clogging the same to such an ex-v tent that it must shut down. .Many attempts have been made to overcome this difllculty with more or less success, and the principal object of this invention is to eliminate the possibility of solids being caught blades.

I have accomplished this result by employing an entirely different principle of operation than has been employed heretofore in centrifugal pumps. In accordance with the present invention the interior of the Pu p is so shaped that the velocity of the liquid is increased as it passes through the eye of the impeller, then decreased in an inlet chamber,- and its velocity again increased as it passes the Heel of an impeller blade.

The result of this change of velocity of the 'liquid causes the solids to bunch together as the velocityis slowed up in the inlet chamber, and

the increase of velocityimmediately thereafter eausesthe solids to be drawn across the space in front of the heel of an impeller blade, thereby preventing the solids from being caught on the 7 heel. The invention consists, therefore, in the several novel features of construction, arrangement and combination of parts hereinafter fully .set forth and claimed.

The invention is clearly illustrated. in the drawing accompanying this specification, in which: I

Fig. 1 is a central vertical longitudinal section through to centrifugal pump, embodying a simple form of h broken away. I

Fig. 2 is a vertical cross section of theimpeller taken on the line 2-2 of Fig. 1.

r Fig. 3 is a vertical crosssectionof the impeller taken on the line 3-3 of Fig. l, and

Fig. 4'is a detailed horizontal cross section taken-on the line of Figs. 1 and}.

Referring to said drawing, the reference character I designates the, base of a" centrifugal pump, upon which is mounted a housing 8 containing bearings, one of'which is seen-at T, in

on the heels of impeller l mounted on its tapered end as by a hub is; de-

e present invention, with certain parts i.

tric motor (not shown). Bolted to the housing v is one side wall 9 of the pump casing, which side wall may be formed with a housing il' con-' 5 ,tainingpacking ll around the impeller shaft.

Bolted to the side wall a is the end wall I! of the 'pump casing, which contains the usual volute chamber of the pump. If desired,- the other side wall I; of the pump casing may be cast integral with the end wallit. The inlet pipe to the pump 'is shown at M. and as shown it has abolting 1 flange l5, rigid on its end, whichis bolted to the side wall it of the pump casing, as by bolts and nuts I. The discharge 'endof the volute chamber is shown at IT. Obviously the construction of the parts above described may be varied to suit the type of. pumpio which the invention is applied. 1

, Theimpellershaft projects into the interior of the pump .casing,- and the impeller i8 is sirably a bolt 2!, threaded in the end of the shaft fastens the impeller thereon. The impeller shown is of the'closed type; it"has two spaced 25 disposed in co-axial alisnment with the inlet pipe .and eye. Thefaceof the suction inlet conposegof the reduction in diameter of the eyeas compared with that of the inlet pipe is to increase the velocity of the liquid passing through theeye or the-impeller.

The eye opens to an inlet chamber 26 in'the .impellenjin which chamber the velocity of the liquid lei-decreased as it passes throughdt, and ,this slowing up of the .velocity allows the solids The heel 21 of each impellerblade is made relatively narrow and is convex or rounded off as seen in Figures 2 and 3, and merges into the inner and outer faces 28, 29 of the blades. Instead of being parallel-with the axis of the impeller,

the heel of each-blade preferably slopes at. an angle to the axis of the impeller, and the inner and outer faces of the blades, beginning at the which is mounted an impeller shaft 8,. driven 5 heel, slope from one side wall to theother for a PATENT pan I side wall ll of the casinghas a suction inlet 25 to bunch together before proceeding through the passages between the impeller bladest short distance and gradually merge into the nels formed by the side walls and blades may be.

circular or other rounded contour,.a.s is desired. The inner face 28 of eachbiade extends in a curvilinear line from the convex face of the heel, running from the curved face of the eye along a line which is non-concentric with respect to the axis of the impeller, and approaches the opposite heel to a point'approxlmately opposite the crown of said heel, whereby the cross sectional area of the passages between the heels and the leadin ends of the blades decreases to a point approximately oppositethe crown of said heel, and then continues along a curvilinear line approximately concentric with the convex face of the heel of the other blade, and then takes a curvature suitable for most efficient pumping of the liquid, the extremity of the inner face ending at the periphery of the impeller.

The outer face 29 of each blade extends from the convex face of the heel along a curved line substantially paralleling the curvature of the inner face of the tail end of the companion blade and then curves in a direction around but excentric to the axis of the impeller, and progresses towards the periphery of the impeller along a curved line best adapted for efficiently impelling the liquid. Desirably the tail end of each blade extends for some distance beyond the heel of the companion blade.

As is well upderstood, the concave inner faces of the impeller blades impart suction upon the liquid and the convex sides thereof serve to, impel the liquid from the inlet chamber of the impeller to the volute chamber of the casing. However, by reason of the shape of the forward or entering ends of the sides of the blades, the velocity of the liquid isincreased as it passes the heel of a companion blade, and the suction effect of the inner face of each blade adjacent it heel, serves to draw the liquids and solids away from the opposite heel, thereby preventing the solids from being caught thereon.

' I claim as new and desire to secure by Letters Patent:

1. A centrifugal pump casing. having a suction inlet and an impeller rotating in the casing,-said *impeller being formed with an eye and with impeller blades, means to increase the velocity of liquids passing through the eye of the impeller and means to decrease the velocity of the liquid after passing through the eye, each of said impeller blades having a leading end adjacent the eye and a trailing end at the periphery of the impeller, a convex heel at its leading end and inner and outer faces that progress from the convex heel to the periphery on curvilinear lines. the inner and outer curved faces of each blade'diverging from the convex heel to provide a thickened part beyond the heel and then convergin toward the trailing end, with the inner face of each blade substantially paralleling the convex heel and outer face of the thickened portion of the other blade to formpassages between the blades whereby the velocity. of the liquid passing through the passageway is increased across the path of travel of the heel.

2. A centrifugal pump comprising a pump casing having a suction inlet which converges toward the interior of the pump casing, an impeller rotating in said pump casing and having an eye of substantially the same diameter as the smallest diameter of the suction inlet whereby the velocity of liquids passing through the eye is increased. said impeller having an enlarged inlet chamber into which the eye opens, said impeller also having impeller blades, each of said impeller blades having a leading end adjacent the eye and a trailing end at the periphery of theimpeller, a convex heel at its leading end and inner and outer faces that progress from the convex heel to the periphery on curvilinear lines, the inner and outer curved faces of each blade diverging from the convex heel to provide a thickened part beyond the heel and then converging toward the trailing end, with the inner face ofeach blade substantially paralleling the convex heel and outer face of the thickened portion of the other blade to form passages between the blades whereby the velocity of the liquid passing through the passageway is increased across the path of travel of the heel.

WILLIAM H. LANNERT.

US310673A 1939-12-23 1939-12-23 Centrifugal pump Expired - Lifetime US2272469A (en)

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Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2535695A (en) * 1950-06-07 1950-12-26 Jr Albert R Pezzillo Motor pump unit
US2633804A (en) * 1948-05-06 1953-04-07 Alois P Bruce Pump
US2875698A (en) * 1959-03-03 Combination centrifugal-turbine pump
US2887958A (en) * 1952-06-30 1959-05-26 Arthur P Davidson Pump
US2925952A (en) * 1953-07-01 1960-02-23 Maschf Augsburg Nuernberg Ag Radial-flow-compressor
US2992617A (en) * 1958-10-23 1961-07-18 Worthington Corp Centrifugal pump with self-priming characteristics
DE1152887B (en) * 1955-03-16 1963-08-14 Roth Co Roy E Multi-stage pump for delivering boiling or near-boiling liquids or liquefied gases
US3130678A (en) * 1961-04-28 1964-04-28 William F Chenault Centrifugal pump
DE1196506B (en) * 1957-05-28 1965-07-08 Klein Schanzlin & Becker Ag Channel impeller for centrifugal pumps
US3263909A (en) * 1964-07-30 1966-08-02 Black & Decker Mfg Co High-efficiency fan assembly for vacuum cleaner
US3817652A (en) * 1970-08-12 1974-06-18 R Fuller High head solids pumps
US4063849A (en) * 1975-02-12 1977-12-20 Modianos Doan D Non-clogging, centrifugal, coaxial discharge pump
DE3015188A1 (en) * 1979-04-27 1980-10-30 Itt Ind Gmbh 7800 Freiburg Deu paddle wheel
US4575312A (en) * 1982-06-02 1986-03-11 Itt Industries, Inc. Impeller
US4681508A (en) * 1984-11-14 1987-07-21 Kim Choong W Supercavitation centrifugal pump
DE3615686A1 (en) * 1986-05-09 1987-11-12 Klein Schanzlin & Becker Ag Channel impeller for centrifugal pumps
US4775297A (en) * 1986-03-12 1988-10-04 Klein, Schanzlin & Becker Aktiengesellschaft Non-clogging impeller for use in axial and mixed-flow centrifugal pumps
US5348444A (en) * 1990-05-12 1994-09-20 Ksb Aktiengesellschaft Single-blade impeller for centrifugal pumps
US6837684B2 (en) 2002-10-25 2005-01-04 Grundfos Management A/S Pump impeller
US20050013688A1 (en) * 2003-07-18 2005-01-20 Shinmaywa Industries, Ltd. Impeller and sewage treatment pump including the same
WO2006133577A1 (en) * 2005-06-16 2006-12-21 Egger Pumps Technology Ag Centrifugal pump
WO2007126981A2 (en) * 2006-03-28 2007-11-08 The Gorman-Rupp Company Impeller
US20090311091A1 (en) * 2007-12-11 2009-12-17 Shinmaywa Industries, Ltd. Impeller and centrifugal pump including the same
WO2014029790A1 (en) * 2012-08-23 2014-02-27 Sulzer Pumpen Ag Pump for conveying effluent, impeller and base plate for such a pump
US20140064970A1 (en) * 2011-04-21 2014-03-06 Ksb Aktiengesellschaft Impeller for Centrifugal Pumps
WO2016032327A1 (en) 2014-08-26 2016-03-03 Ihc Holland Ie B.V. Impeller blade with asymmetric thickness

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2875698A (en) * 1959-03-03 Combination centrifugal-turbine pump
US2633804A (en) * 1948-05-06 1953-04-07 Alois P Bruce Pump
US2535695A (en) * 1950-06-07 1950-12-26 Jr Albert R Pezzillo Motor pump unit
US2887958A (en) * 1952-06-30 1959-05-26 Arthur P Davidson Pump
US2925952A (en) * 1953-07-01 1960-02-23 Maschf Augsburg Nuernberg Ag Radial-flow-compressor
DE1152887B (en) * 1955-03-16 1963-08-14 Roth Co Roy E Multi-stage pump for delivering boiling or near-boiling liquids or liquefied gases
DE1196506B (en) * 1957-05-28 1965-07-08 Klein Schanzlin & Becker Ag Channel impeller for centrifugal pumps
US2992617A (en) * 1958-10-23 1961-07-18 Worthington Corp Centrifugal pump with self-priming characteristics
US3130678A (en) * 1961-04-28 1964-04-28 William F Chenault Centrifugal pump
US3263909A (en) * 1964-07-30 1966-08-02 Black & Decker Mfg Co High-efficiency fan assembly for vacuum cleaner
US3817652A (en) * 1970-08-12 1974-06-18 R Fuller High head solids pumps
US4063849A (en) * 1975-02-12 1977-12-20 Modianos Doan D Non-clogging, centrifugal, coaxial discharge pump
DE3015188A1 (en) * 1979-04-27 1980-10-30 Itt Ind Gmbh 7800 Freiburg Deu paddle wheel
US4575312A (en) * 1982-06-02 1986-03-11 Itt Industries, Inc. Impeller
US4681508A (en) * 1984-11-14 1987-07-21 Kim Choong W Supercavitation centrifugal pump
US4775297A (en) * 1986-03-12 1988-10-04 Klein, Schanzlin & Becker Aktiengesellschaft Non-clogging impeller for use in axial and mixed-flow centrifugal pumps
DE3615686A1 (en) * 1986-05-09 1987-11-12 Klein Schanzlin & Becker Ag Channel impeller for centrifugal pumps
US5348444A (en) * 1990-05-12 1994-09-20 Ksb Aktiengesellschaft Single-blade impeller for centrifugal pumps
US6837684B2 (en) 2002-10-25 2005-01-04 Grundfos Management A/S Pump impeller
US20050013688A1 (en) * 2003-07-18 2005-01-20 Shinmaywa Industries, Ltd. Impeller and sewage treatment pump including the same
US7837431B2 (en) * 2003-07-18 2010-11-23 Shinmaywa Industries, Ltd. Impeller and sewage treatment pump including the same
CN101208521B (en) 2005-06-16 2011-08-31 艾格泵业有限公司 Centrifugal pump
US8025478B2 (en) 2005-06-16 2011-09-27 Egger Pumps Technology Ag Centrifugal pump
US20090324402A1 (en) * 2005-06-16 2009-12-31 Egger Pumps Technology Ag Centrifugal pump
WO2006133577A1 (en) * 2005-06-16 2006-12-21 Egger Pumps Technology Ag Centrifugal pump
US8025479B2 (en) 2006-03-28 2011-09-27 The Gorman-Rupp Company Impeller
WO2007126981A2 (en) * 2006-03-28 2007-11-08 The Gorman-Rupp Company Impeller
WO2007126981A3 (en) * 2006-03-28 2008-08-21 Gorman Rupp Co Impeller
US20100239417A1 (en) * 2006-03-28 2010-09-23 Scott Thomas M Impeller
US20090311091A1 (en) * 2007-12-11 2009-12-17 Shinmaywa Industries, Ltd. Impeller and centrifugal pump including the same
US8282347B2 (en) 2007-12-11 2012-10-09 Shinmaywa Industries, Ltd. Impeller and centrifugal pump including the same
US9556739B2 (en) * 2011-04-21 2017-01-31 Ksb Aktiengesellschaft Impeller for centrifugal pumps
US20140064970A1 (en) * 2011-04-21 2014-03-06 Ksb Aktiengesellschaft Impeller for Centrifugal Pumps
WO2014029790A1 (en) * 2012-08-23 2014-02-27 Sulzer Pumpen Ag Pump for conveying effluent, impeller and base plate for such a pump
US20150240818A1 (en) * 2012-08-23 2015-08-27 Sulzer Pumpen Ag Pump for conveying waste water as well as impeller and base plate for such a pump
CN104685217B (en) * 2012-08-23 2017-10-24 苏尔寿管理有限公司 Pump for transport wastewater and the impeller and bottom plate for this pump
US10495092B2 (en) * 2012-08-23 2019-12-03 Sulzer Management Ag Pump for conveying waste water as well as impeller and base plate for such a pump
CN104685217A (en) * 2012-08-23 2015-06-03 苏舍泵有限公司 Pump for conveying effluent, impeller and base plate for such a pump
CN106795892A (en) * 2014-08-26 2017-05-31 Ihc荷兰Ie有限公司 Impeller blade with asymmetric thickness
WO2016032327A1 (en) 2014-08-26 2016-03-03 Ihc Holland Ie B.V. Impeller blade with asymmetric thickness
AU2015307309B2 (en) * 2014-08-26 2019-03-07 Ihc Holland Ie B.V. Impeller blade with asymmetric thickness
NL2013367B1 (en) * 2014-08-26 2016-09-26 Ihc Holland Ie Bv Impeller blade with asymmetric thickness.

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