US3512788A - Self-adjusting wearing rings - Google Patents

Self-adjusting wearing rings Download PDF

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Publication number
US3512788A
US3512788A US3512788DA US3512788A US 3512788 A US3512788 A US 3512788A US 3512788D A US3512788D A US 3512788DA US 3512788 A US3512788 A US 3512788A
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impeller
pump
casing
self
sealing
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John K Kilbane
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ALLIS-CHALMERS PUMP Inc A DE CORP
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Allis Chalmers Corp
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Assigned to WOODS KATHLEEN D., AS TRUSTEE, CONNECTICUT NATIONAL BANK THE, A NATIONAL BANKING ASSOCIATION AS TRUSTEE reassignment WOODS KATHLEEN D., AS TRUSTEE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALLIS-CHALMERS CORPORATION A DE CORP.
Assigned to ALLIS-CHALMERS PUMP, INC., A DE CORP reassignment ALLIS-CHALMERS PUMP, INC., A DE CORP ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ALLIS-CHALMERS CORPORATION A DE CORP
Assigned to CONNECTICUT NATIONAL BANK, THE, A NATIONAL BANKING ASSOCIATION, WOODS, KATHLEEN D. reassignment CONNECTICUT NATIONAL BANK, THE, A NATIONAL BANKING ASSOCIATION SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALLIS-CHALMERS PUMP, INC.
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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
    • F04D29/2266Rotors specially for centrifugal pumps with special measures for sealing or thrust balance
    • 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
    • F04D29/08Sealings
    • F04D29/16Sealings between pressure and suction sides
    • F04D29/165Sealings between pressure and suction sides especially adapted for liquid pumps
    • F04D29/167Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/26Sealings between relatively-moving surfaces with stuffing-boxes for rigid sealing rings

Description

May 19, 1970. J. KL'VKILBANE 3,512,788

SELF-ADJUSTING WEARING RINGS Filed Nov. 1, 1967 J45 W g M @XX B/MM United States Patent 3,512,788 SELF-ADJUSTING WEARING RINGS John K. Kilbane, Wauwatosa, Wis., assignor to Allis- Chalmers Manufacturing Company, Milwaukee, Wis. Filed Nov. 1, 1967, Ser. No. 679,759 Int. Cl. F16j 9/00; F16k 41/00 US. Cl. 277-25 2 Claims ABSTRACT OF THE DISCLOSURE A self-adjusting wearing ring between a pump impeller and the pump casing. The wearing ring is slidably contained in an annular groove in the peripheral surface of the impeller and forced into sealing engagement with the pump casing due to centrifugal force as the impeller rotates.

This invention relates generally to rotary pumps and more specifically to a means for providing a seal between the pump impeller and the pump casing.

In rotary pumps it is necessary to provide a seal between the rotating impeller and the stationary casing so that the fluid passing through the pump will not leak excessively between the impeller and the casing. This is usually accomplished by providing a wearing ring in the pump casing. In most cases the wearing ring is rigidly contained in the pump casing. In some cases means to manually adjust the wearing ring are provided so that adequate sealing can be maintained as wear takes place between the relatively rotating parts. However, even with an adjustable wearing ring, it is difficult to determine when adjustment should be made and at what frequency.

It is therefore the general object of this invention to provide a seal between the pump impeller and the pump casing which is self-adjusting.

A more specific object of the subject invention is to provide a seal element in the pump impeller which is forced radially due to centrifugal action, into sealing engagement with a sealing surface on the pump casing.

These and other objects of the subject invention will become more fully apparent as the following description is read in light of the attached drawing wherein:

FIG. 1 is a cross sectional view of a pump incorporating this invention;

FIG. 2 is an exploded view of a portion of FIG. 1 showing the invention; and

FIG. 3 shows a suggested type of sealing element.

Referring more specifically to the drawing and particularly FIG. 1, the invention is shown for purposes of illustration in connection with a centrifugal pump generally designated 6. The pump has a casing 7 having an axial inlet 8 and a radially spaced discharge 9. .The casing 7 is provided with a rear cover plate 11 which combines with the rest of the casing to define an impeller chamber 12. A suitable impeller 13 is mounted on one end of a drive shaft 14 and positioned within the impeller chamber 12 with the other end of the shaft extending through an opening in the rear cover plate 11. For purposes of illustration, the impeller shown herein is of the closed type and has both a front and rear shroud plate numbered and 15 respectively. The shaft is adapted to be driven by a suitable source of power such as an electric motor (not shown).

A stufling box 16 with an annular cavity surrounding the shaft 14 is formed in the rear cover plate 11. The stuffing box is filled with any suitable packing material and the outboard end of the stufling box is closed oif by an annular gland 17. v

The impeller 13 has an intake 18 aligned with the inlet 8 and a set of blades 19 that propel fluid radially outward into the discharge volute 21. In the preferred em- 3,512,788 Patented May 19, 1970 bodiment, the impeller 13 has a front hub 22 and a rear hub 23. The rear hub 23 is rigidly connected to the shaft 14. In the preferred embodiment shown herein for purposes of illustration, the front hub 22 is an extension of the front shroud plate 10.

The front hub 22 has an annular groove 24 therein with an open end facing radially outward from the rotational axis of the impeller. A sealing surface 26 in the form of a ringed insert is rigidly connected to the pump casing 7 and positioned concentric with the groove 24. A sealing element 27 is slidably contained within the groove 24. The sealing element 27 may be composed of two half sections as shown in FIG. 3. This is to permit radial movernent of the sealing element in the groove 24 due to centrifugal force as the impeller 13 rotates. Grooves 25 are provided on the interior surface of the ring 27. In order to prohibit relative rotation between the ring 27 and the impeller 13 antirotation pins 29 are provided in the front hub 22 and extend into the grooves. The grooves are open on the radially inner end to permit radial movement of the ring. With the sealing element 27 in the groove 24, upon rotation of the impeller the two half sections of the sealing element will move outward into sealing engagement with the insert 26. With this arrangement, an adequate seal is provided between the impeller and the pump casing which does not require periodic adjustment.

There is contact along the surface 28 between the sealing element 27 and the front wall of the groove 24. This contact is caused by the pressure differential between opposite sides of the sealing element. The interior of the pump is exposed to the higher pressure of the fluid WhlCh has been expelled into the volute after passing through the pump impeller. This higher pressure fluid therefore forces the sealing element 24 into contact with the forward surface of the groove 24 providing a seal along the surface 28.

From the above it can be seen that an extremely inexpensive self-adjusting seal has been provided bet-ween the rotating impeller and stationary casing of a rotary pump. Although only one embodiment has been herern shown and described, other embodiments will be ap parent to those skilled in the art after reading this description and it is intended that all such embodiments as come within a reasonable interpretation of the appended claims be covered.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. In a rotary pump, the combination of a casing defining a pumping chamber, an impeller including a hub rotatably supported in the pumping chamber and a sealing device between the impeller and casing for sealing high pressure fluid in the pumping chamber comprising: an annular groove in the outer surface of said hub having radially extending side walls and an open end extending radially from the rotational axis of the impeller; an annular sealing surface on the interior of said casing concentric with said groove and radially spaced therefrom; a sealing ring composed of at least two arcuate segments slidably contained in said groove and moved radially outwardly by centrifugal force into sealing engagement with said sealing surface upon rotation of said impeller, the width of said sealing ring being slightly less than the width of said groove whereby said ring is urged axially into sealing engagement with the side wall of said groove remote from said pumping chamber by the action of the high pressure fluid in the pumping chamber upon rotation of the impeller; and means associated with said ring and said hub prohibiting relative rotational movement therebetween while permitting both radial and axial movement of said ring relative to said hub.

2. The sealing device set forth in claim 1 wherein said pump is of the centrifugal type, said impeller is of 4 the closed 'type having both a front and rear shroud plate 2,570,427 10/ 1951 Chillson et al 27781 X and said groove is in said front shroud plate. 2,943,463 7/1960 Shipley 277-25 X References Cited SAMUEL ROTHBERG, Primary Examiner UNITED STATES PATENTS 5 US. Cl. X.R.

1,715,944 6/1929 Oliver. 2,162,218 6/1939 Hill 27768 X 27732, 132, 174; 103-103, 111

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Cited By (53)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738769A (en) * 1970-09-16 1973-06-12 Klein Schanzlin & Becker Ag Housing for centrifugal pumps
US4023918A (en) * 1975-02-10 1977-05-17 Itt Industries, Inc. Pump
US4063846A (en) * 1974-11-13 1977-12-20 Borg-Warner Corporation Pump impeller improvement
US4198063A (en) * 1977-10-06 1980-04-15 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Shaft sealing device for turbocharger
US4199154A (en) * 1976-07-28 1980-04-22 Stauffer Chemical Company Labyrinth sealing system
US4230324A (en) * 1977-12-23 1980-10-28 K. G. Derman Ab Device for sealing an annular opening between a shaft and housing surrounding the shaft
US4269564A (en) * 1978-10-02 1981-05-26 Bank Of America N.T. & S.A. Flow control device
US4511307A (en) * 1983-09-02 1985-04-16 Dresser Industries, Inc. Centrifugal pump
DE3639304C1 (en) * 1986-11-17 1988-05-26 Ford Werke Ag Sealing ring assembly for sealing a pressure medium channel between rotating relative to each other machine parts
US4909706A (en) * 1987-01-28 1990-03-20 Union Carbide Corporation Controlled clearance labyrinth seal
US4909707A (en) * 1989-02-14 1990-03-20 Itt Corporation Centrifugal pump and floating casing ring therefor
US5209636A (en) * 1991-12-05 1993-05-11 Ingersoll-Rand Company Method and apparatus for setting clearance between fluid displacement housing and rotors
US5344162A (en) * 1992-02-29 1994-09-06 Rolls-Royce Plc Sealing ring for gas turbine engines
US5407331A (en) * 1992-01-14 1995-04-18 Mitsubishi Jukogyo Kabushiki Kaisha Motor-driven pump
US5951243A (en) * 1997-07-03 1999-09-14 Cooper; Paul V. Rotor bearing system for molten metal pumps
US6093000A (en) * 1998-08-11 2000-07-25 Cooper; Paul V Molten metal pump with monolithic rotor
US6303074B1 (en) 1999-05-14 2001-10-16 Paul V. Cooper Mixed flow rotor for molten metal pumping device
US6345964B1 (en) 1996-12-03 2002-02-12 Paul V. Cooper Molten metal pump with metal-transfer conduit molten metal pump
US20030049141A1 (en) * 2001-09-07 2003-03-13 Masters Steven E. Airflow Generating device air intake
US6689310B1 (en) 2000-05-12 2004-02-10 Paul V. Cooper Molten metal degassing device and impellers therefor
US6723276B1 (en) 2000-08-28 2004-04-20 Paul V. Cooper Scrap melter and impeller
US20070020084A1 (en) * 2004-12-15 2007-01-25 Juergen Krines Compressor, in particular lateral channel compressor
WO2007033421A1 (en) * 2005-09-22 2007-03-29 Pump Technology Services Pty Ltd Seal assembly
US7402276B2 (en) 2003-07-14 2008-07-22 Cooper Paul V Pump with rotating inlet
US20080211147A1 (en) * 2002-07-12 2008-09-04 Cooper Paul V System for releasing gas into molten metal
US7470392B2 (en) 2003-07-14 2008-12-30 Cooper Paul V Molten metal pump components
US7507367B2 (en) 2002-07-12 2009-03-24 Cooper Paul V Protective coatings for molten metal devices
US7731891B2 (en) 2002-07-12 2010-06-08 Cooper Paul V Couplings for molten metal devices
US7906068B2 (en) 2003-07-14 2011-03-15 Cooper Paul V Support post system for molten metal pump
US20120102969A1 (en) * 2010-10-28 2012-05-03 Wagner Joel H Centrifugal compressor with bleed flow splitter for a gas turbine engine
US8337746B2 (en) 2007-06-21 2012-12-25 Cooper Paul V Transferring molten metal from one structure to another
US8361379B2 (en) 2002-07-12 2013-01-29 Cooper Paul V Gas transfer foot
US8366993B2 (en) 2007-06-21 2013-02-05 Cooper Paul V System and method for degassing molten metal
US8444911B2 (en) 2009-08-07 2013-05-21 Paul V. Cooper Shaft and post tensioning device
US8449814B2 (en) 2009-08-07 2013-05-28 Paul V. Cooper Systems and methods for melting scrap metal
US8524146B2 (en) 2009-08-07 2013-09-03 Paul V. Cooper Rotary degassers and components therefor
US8535603B2 (en) 2009-08-07 2013-09-17 Paul V. Cooper Rotary degasser and rotor therefor
US8613884B2 (en) 2007-06-21 2013-12-24 Paul V. Cooper Launder transfer insert and system
US20140072424A1 (en) * 2012-09-07 2014-03-13 Herborner Pumpenfabrik J.H. Hoffmann GmbH & Co. KG Centrifugal pump and impeller protector for centrifugal pump
US8714914B2 (en) 2009-09-08 2014-05-06 Paul V. Cooper Molten metal pump filter
US9011761B2 (en) 2013-03-14 2015-04-21 Paul V. Cooper Ladle with transfer conduit
US9108244B2 (en) 2009-09-09 2015-08-18 Paul V. Cooper Immersion heater for molten metal
US9156087B2 (en) 2007-06-21 2015-10-13 Molten Metal Equipment Innovations, Llc Molten metal transfer system and rotor
US9205490B2 (en) 2007-06-21 2015-12-08 Molten Metal Equipment Innovations, Llc Transfer well system and method for making same
US9409232B2 (en) 2007-06-21 2016-08-09 Molten Metal Equipment Innovations, Llc Molten metal transfer vessel and method of construction
US9410744B2 (en) 2010-05-12 2016-08-09 Molten Metal Equipment Innovations, Llc Vessel transfer insert and system
US9643247B2 (en) 2007-06-21 2017-05-09 Molten Metal Equipment Innovations, Llc Molten metal transfer and degassing system
RU2636969C1 (en) * 2016-09-06 2017-11-29 Акционерное общество "Гидрогаз" (АО "Гидрогаз") Pump impeller seal
US9903383B2 (en) 2013-03-13 2018-02-27 Molten Metal Equipment Innovations, Llc Molten metal rotor with hardened top
US10052688B2 (en) 2013-03-15 2018-08-21 Molten Metal Equipment Innovations, Llc Transfer pump launder system
US10138892B2 (en) 2014-07-02 2018-11-27 Molten Metal Equipment Innovations, Llc Rotor and rotor shaft for molten metal
US10267314B2 (en) 2016-01-13 2019-04-23 Molten Metal Equipment Innovations, Llc Tensioned support shaft and other molten metal devices
US10428821B2 (en) 2009-08-07 2019-10-01 Molten Metal Equipment Innovations, Llc Quick submergence molten metal pump

Citations (4)

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US1715944A (en) * 1921-07-12 1929-06-04 Oliver Sherwood Co Elastic seal
US2162218A (en) * 1937-07-08 1939-06-13 Wright Aeronautical Corp Oil seal
US2570427A (en) * 1946-08-02 1951-10-09 Curtiss Wright Corp Rotary seal
US2943463A (en) * 1959-11-23 1960-07-05 Gen Electric Grease seal for high speed flexible coupling

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1715944A (en) * 1921-07-12 1929-06-04 Oliver Sherwood Co Elastic seal
US2162218A (en) * 1937-07-08 1939-06-13 Wright Aeronautical Corp Oil seal
US2570427A (en) * 1946-08-02 1951-10-09 Curtiss Wright Corp Rotary seal
US2943463A (en) * 1959-11-23 1960-07-05 Gen Electric Grease seal for high speed flexible coupling

Cited By (102)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738769A (en) * 1970-09-16 1973-06-12 Klein Schanzlin & Becker Ag Housing for centrifugal pumps
US4063846A (en) * 1974-11-13 1977-12-20 Borg-Warner Corporation Pump impeller improvement
US4023918A (en) * 1975-02-10 1977-05-17 Itt Industries, Inc. Pump
US4199154A (en) * 1976-07-28 1980-04-22 Stauffer Chemical Company Labyrinth sealing system
US4198063A (en) * 1977-10-06 1980-04-15 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Shaft sealing device for turbocharger
US4230324A (en) * 1977-12-23 1980-10-28 K. G. Derman Ab Device for sealing an annular opening between a shaft and housing surrounding the shaft
US4269564A (en) * 1978-10-02 1981-05-26 Bank Of America N.T. & S.A. Flow control device
US4511307A (en) * 1983-09-02 1985-04-16 Dresser Industries, Inc. Centrifugal pump
DE3639304C1 (en) * 1986-11-17 1988-05-26 Ford Werke Ag Sealing ring assembly for sealing a pressure medium channel between rotating relative to each other machine parts
US4909706A (en) * 1987-01-28 1990-03-20 Union Carbide Corporation Controlled clearance labyrinth seal
US4909707A (en) * 1989-02-14 1990-03-20 Itt Corporation Centrifugal pump and floating casing ring therefor
US5209636A (en) * 1991-12-05 1993-05-11 Ingersoll-Rand Company Method and apparatus for setting clearance between fluid displacement housing and rotors
US5407331A (en) * 1992-01-14 1995-04-18 Mitsubishi Jukogyo Kabushiki Kaisha Motor-driven pump
US5344162A (en) * 1992-02-29 1994-09-06 Rolls-Royce Plc Sealing ring for gas turbine engines
US6345964B1 (en) 1996-12-03 2002-02-12 Paul V. Cooper Molten metal pump with metal-transfer conduit molten metal pump
US5951243A (en) * 1997-07-03 1999-09-14 Cooper; Paul V. Rotor bearing system for molten metal pumps
US6093000A (en) * 1998-08-11 2000-07-25 Cooper; Paul V Molten metal pump with monolithic rotor
US6398525B1 (en) 1998-08-11 2002-06-04 Paul V. Cooper Monolithic rotor and rigid coupling
US6303074B1 (en) 1999-05-14 2001-10-16 Paul V. Cooper Mixed flow rotor for molten metal pumping device
US6689310B1 (en) 2000-05-12 2004-02-10 Paul V. Cooper Molten metal degassing device and impellers therefor
US6723276B1 (en) 2000-08-28 2004-04-20 Paul V. Cooper Scrap melter and impeller
US20030049141A1 (en) * 2001-09-07 2003-03-13 Masters Steven E. Airflow Generating device air intake
US6729859B2 (en) * 2001-09-07 2004-05-04 Pro-Team, Inc. Airflow generating device air intake
US9435343B2 (en) 2002-07-12 2016-09-06 Molten Meal Equipment Innovations, LLC Gas-transfer foot
US8440135B2 (en) 2002-07-12 2013-05-14 Paul V. Cooper System for releasing gas into molten metal
US8361379B2 (en) 2002-07-12 2013-01-29 Cooper Paul V Gas transfer foot
US20080211147A1 (en) * 2002-07-12 2008-09-04 Cooper Paul V System for releasing gas into molten metal
US8178037B2 (en) 2002-07-12 2012-05-15 Cooper Paul V System for releasing gas into molten metal
US7507367B2 (en) 2002-07-12 2009-03-24 Cooper Paul V Protective coatings for molten metal devices
US9034244B2 (en) 2002-07-12 2015-05-19 Paul V. Cooper Gas-transfer foot
US7731891B2 (en) 2002-07-12 2010-06-08 Cooper Paul V Couplings for molten metal devices
US8529828B2 (en) 2002-07-12 2013-09-10 Paul V. Cooper Molten metal pump components
US8409495B2 (en) 2002-07-12 2013-04-02 Paul V. Cooper Rotor with inlet perimeters
US8110141B2 (en) 2002-07-12 2012-02-07 Cooper Paul V Pump with rotating inlet
US7906068B2 (en) 2003-07-14 2011-03-15 Cooper Paul V Support post system for molten metal pump
US7470392B2 (en) 2003-07-14 2008-12-30 Cooper Paul V Molten metal pump components
US8501084B2 (en) 2003-07-14 2013-08-06 Paul V. Cooper Support posts for molten metal pumps
US7402276B2 (en) 2003-07-14 2008-07-22 Cooper Paul V Pump with rotating inlet
US8475708B2 (en) 2003-07-14 2013-07-02 Paul V. Cooper Support post clamps for molten metal pumps
US8075837B2 (en) 2003-07-14 2011-12-13 Cooper Paul V Pump with rotating inlet
US20070020084A1 (en) * 2004-12-15 2007-01-25 Juergen Krines Compressor, in particular lateral channel compressor
US20090134582A1 (en) * 2005-09-22 2009-05-28 Anthony Joseph Murray Seal Assembly
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US10072891B2 (en) 2007-06-21 2018-09-11 Molten Metal Equipment Innovations, Llc Transferring molten metal using non-gravity assist launder
US9982945B2 (en) 2007-06-21 2018-05-29 Molten Metal Equipment Innovations, Llc Molten metal transfer vessel and method of construction
US8366993B2 (en) 2007-06-21 2013-02-05 Cooper Paul V System and method for degassing molten metal
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US9017597B2 (en) 2007-06-21 2015-04-28 Paul V. Cooper Transferring molten metal using non-gravity assist launder
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US9862026B2 (en) 2007-06-21 2018-01-09 Molten Metal Equipment Innovations, Llc Method of forming transfer well
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US9108244B2 (en) 2009-09-09 2015-08-18 Paul V. Cooper Immersion heater for molten metal
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