US3732032A - Centrifugal pumps - Google Patents

Centrifugal pumps Download PDF

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Publication number
US3732032A
US3732032A US3732032DA US3732032A US 3732032 A US3732032 A US 3732032A US 3732032D A US3732032D A US 3732032DA US 3732032 A US3732032 A US 3732032A
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Prior art keywords
impeller
body
outlet
sidewall
perforation
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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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C Daneel
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BAGGERS Ltd
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BAGGERS Ltd
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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

Abstract

The invention relates to an impeller for a centrifugal pump permitting the passage of solids through the pump and which maintains a high delivery pressure and capacity in which the impeller has a body having, in cross section, a regular polygonal configuration, an axis of rotation located substantially equidistant the corners of the body, an inlet to the body located at the axis of rotation, an outlet from the body provided in a sidewall of the body and a conduit communicating between the inlet and the outlet.

Description

1% States atent 1 1 1 3,732,932 Daneel 51 May 8, 1973 CENTRIFUGAL PUMPS 2,853,019 9/1958 Thornton ..415/213 [75] Inventor: Char Daneel, Wellington FOREIGN PATENTS OR APPLICATIONS public of South Africa I i 189,936 6/1937 Switzerland ..415/213 [73] Asslgfleel P" l 330,071 6/1930 Great Britain... ,..41s/213 ville, pe Provmce Republlc 574,079 12/1945 Great Britain... ...415/213 of South Africa 329,498 6/1958 Switzerland ..415/213 [22 Filed: Feb. 16, 1971 Appl. No.: 1 15,333

[52] US. Cl. ..4l6/144, 416/186, 415/213, 415/206 [51] Int. Cl ..F01d 5/00 [58] Field of Search ..4l5/106, 104, 204, 415/206, 213; 416/144, 500

[56] References Cited UNITED STATES PATENTS 882,478 3/1908 Neumann ..4l5/97 495,760 4/1893 Seitz ..4l5/204 882,477 3/1908 Neumann ..4l5/204 1,439,365 12/1922 Hazel] ..415/2l3 1,470,607 10/1923 Hazell ..4l6/l44 Primary Examinerllenry F. Raduazo Att0rneyStevens, Davis, Miller & Mosher [57] ABSTRACT The invention relates to an impeller for a centrifugal pump permitting the passage of solids through the pump and which maintains a high delivery pressure and capacity in which the impeller has a body having, in cross section, a regular polygonal configuration, an axis of rotation located substantially equidistant the corners of the body, an inlet to the body located at the axis of rotation, an outlet from the body provided in a sidewall of the body and a conduit communicating between the inlet and the outlet.

6 Claims, 2 Drawing Figures CENTRIFUGAL PUMPS This invention relates to centrifugal pumps and more I particularly single channel pumps.

Conventional centrifugal pumps provided with an axially disposed passage feeding into a plurality of passages formed between radially extending vanes are not suitable for pumping liquids in which is suspended grit or stones. Generally solid matter entrained in the pumped liquid tends to clog at the inlet end to the passages formed between adjacent vanes due to the fact that at this point the passage between the vanes is narrower than the axially disposed passage.

Vaned centrifugal pumps are also not suitable for pumping liquids containing long fibrous or stringy material. Such liquids may for instance be encountered at sewage disposal works. The outer edge of the trailing vane tends to bite in along the length of the thread as .a result of which the thread wraps itself around the rotor causing a blockade. Furthermore, a length of rope or rag passing down the axial passage may be forced into two or more passages between the vanes.

A further disadvantage ofvane type centrifugal pumps is that the passage between adjacent vanes tends to increase in cross-sectional area as the distance from the axis of rotation increases. This decreases the delivery pressure and capacity of the pump.

Various arrangements have been suggested for overcoming this difficulty. One arrangement provides a stationary impeller with the pump casing rotating about it. This arrangement suffers from the disadvantage that the pump is capable only of low pumping capacity and delivery pressure.

In another arrangement aimed at overcoming these disadvantages, an impeller is provided, comprising a single spiral vane which starts substantially at the point of rotation and completes a single spiral. This arrangement also suffers from a number of disadvantages. Inherent in the structure is an ever-increasing passage width which precludes high delivery pressure and capacity. Furthermore, solid material entrained in the liquid pumped has to travel a greater distance, when compared with conventional vaned pumps, before it passes out from the area swept by the spiral vane. As a result, solids passing into the downstream side of the vane fail to pass from the area swept by the vane and tend to impinge against the leading face of the vane during the subsequent revolutions. Not only does this cause wear of the vane, but it introduces additional loads into the system that may damage the vane and the pump bearings.

An object of the present invention is the provision of an impeller in which these disadvantages are at least reduced in their effect.

According to the invention, there is provided an impeller having a body of regular polygonal configuration, an axis of rotation located equidistant the corners of the body, an inlet to the body located at the axis of rotation, an outlet from the body provided in a sidewall of the body and a conduit communicating between the inlet and the outlet.

Further features of the invention provide for the body to be three-sided, for the sidewalls to be bowed outwardly, for the body to be hollow, for the sidewalls to be perforated, in corresponding positions towards the corners of the body, for the outlet to be located in a sidewall between a perforation and the body corner remote from the perforation.

The invention is also directed towards a pump including an impeller as set out in the above consistory clauses.

A preferred form of the invention will now be described with reference to the accompanying drawings in which:

FIG. 1 is a section through the impeller transverse its axis of rotation, the impeller being shown in position in a P p;

FIG. 2 is a section through the impeller along its axis of rotation, the impeller being shown in position in a pump.

The pump comprises a casing l of conventional design. Located inside the pump is an impeller 2 which rotates about axis 3. The impeller is of hollow construction and may be cast conventionally or pressed out of a suitably rigid metal plate. When viewed in an axial direction, as shown in the accompanying FIG. 1, the impeller has the shape of an isoscles triangle with the sides thereof bowed outwards.

During operation of the pump, the impeller is caused to rotate in the direction indicated by arrow 4.

The sidewalls of the impeller are perforated at corresponding positions 5 which are towards the corners of the impeller. During operation of the pump, these positions are downstream of the nearest impeller corner and in a zone of reduced pressure relative to other positions along the sidewalls of the impeller.

The perforated sidewalls of the impeller allow for the interior of the impeller to be flooded with the liquid being pumped which in turn assists in balancing the impeller. Additional balancing of the impeller is achieved by weight 6 which is attached to an interior wall of the impeller. By locating the balancing weight on the interior wall of the impeller, the weight is not subject to wear in the same way that it would have been had it been attached to an exterior wall of the impeller. Furthermore, the weight does not lead to clogging between the impeller and the pump casing as is often the case with impellers balanced on an exterior wall. An axial inlet to the impeller is provided at 7 which communicates through conduit 9 with an outlet from the impeller located at 8. The impeller outlet is provided in a sidewall between a perforation and the corner remote from the perforation. From FIG. 1 it will be noted that the outlet is therefore located downstream from the perforation on the same sidewall.

The conduit 9 is of uniform cross-sectional area throughout its length. Under certain circumstances it may be found to be advantageous to decrease the crosssectional area of the conduit slightly as the distance from the axis of rotation increases.

In operation the impeller is rotated in the direction indicated by the arrow 4 and centrifugal forces cause liquid to be drawn from the inlet 7 into the conduit 9 and discharged via outlet 8 into the casing 1. An increase in the pressure of liquid in the casing 1 causes liquid to be forced into the outlet 10. The comers of the impeller assist in forcing liquid out through outlet 10.

A zone ofrelatively reduced pressure develops behind the corners and this facilitates flow through outlet 8 from passage 9.

It is believed that there is minimum contact between solid materials pumped and the sides of the impeller, particularly rebound of solid material off the casing onto the impeller is reduced. This results in theimpeller being subject to less wear than would be expected. It has also been found that when compared with conventional centrifugal pumps, a higher feed pressure is attained together with an increase in pumping capacity. The pump appears to have a decreasing tendency towards clogging when pumping liquids containing solid material and fibrous matter than is the case with a conventional centrifugal pump. Lastly, the single vane-type centrifugal pump has a tendency to generate a pulse as the vane extremity passes the pump casing outlet. It will be appreciated that such pulse causes uneven running of the pump which in turn leads .to greater wear on the pump parts. This pulse is not generated, to any appreciable intensity, in pumps fitted with impellers according to the present invention.

Location of the perforations in a low pressure zone has the effect of limiting intrusion of dirt and other solid matter into the impeller interior. Furthermore, should wear of conduit 9 result in a hole being formed, solid material passing into the impeller interior would be expelled through the perforations. This has the advantage that the impeller always retains its balance.

The design of the impeller is such as to reduce the development of eddy currents in the pump casing. It is believed that this contributes towards a greater pumping efficiency.

Many other forms of the invention exist, each differing in matters of detail only. Thus instead of a threesided impeller, four or five sides may be provided. The perforations through the sidewalls of the impeller may only be provided along one or two sides.

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

l. A pump impeller comprising a body having, in cross section, a regular polygonal configuration and a hollow interior, an axis of rotation located substantially equidistant the comers of the body, an inlet to the body located at the axis of rotation, a single outlet from the body provided in a sidewall of the body, each sidewall being perforated, in corresponding sidewall positions, towards a comer of the body, means balancing the impeller, and a conduit communicating between the inlet and the outlet.

2. An impeller as claimed in claim 1 in which the body is three-sided.

3. An impeller as claimed in claim 2 in which the sidewalls of the body are bowed outwardly.

4. An impeller as claimed in claim 1 in which the outlet is provided in a sidewall between a perforation through the sidewall and a corner of the body remote from the perforation.

5. An impeller as claimed in claim 4 in which the outlet is located closer to the perforation than the corner remote from the perforation.

6. An impeller as claimed in claim 1 in which the impeller is balanced internally.

Claims (6)

1. A pump impeller comprising a body having, in cross section, a regular polygonal configuration and a hollow interior, an axis of rotation located substantially equidistant the corners of the body, an inlet to the body located at the axis of rotation, a single outlet from the body provided in a sidewall of the body, each sidewall being perforated, in corresponding sidewall positions, towards a corner of the body, means balancing the impeller, and a conduit communicating between the inlet and the outlet.
2. An impeller as claimed in claim 1 in which the body is three-sided.
3. An impeller as claimed in claim 2 in which the sidewalls of the body are bowed outwardly.
4. An impeller as claimed in claim 1 in which the outlet is provided in a sidewall between a perforation through the sidewall and a corner of the body remote from the perforation.
5. An impeller as claimed in claim 4 in which the outlet is located closer to the perforation than the corner remote from the perforation.
6. An impeller as claimed in claim 1 in which the impeller is balanced internally.
US3732032A 1971-02-16 1971-02-16 Centrifugal pumps Expired - Lifetime US3732032A (en)

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Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4156580A (en) * 1977-08-18 1979-05-29 Pohl Lothar L Wind-turbines
DE3015188A1 (en) * 1979-04-27 1980-10-30 Itt Ind Gmbh 7800 Freiburg Deu paddle wheel
DE3519816A1 (en) * 1984-06-06 1985-12-12 Sarlin Ab Oy E pump impeller for
US4575312A (en) * 1982-06-02 1986-03-11 Itt Industries, Inc. Impeller
US5605434A (en) * 1994-09-30 1997-02-25 Ksb Aktiengesellschaft Impeller having transport elements disposed on a pressure side of a cover disk for a centrifugal pump for dirty liquids
WO2000032938A1 (en) * 1998-11-30 2000-06-08 Smith & Loveless, Inc. Single port impeller
US6837684B2 (en) 2002-10-25 2005-01-04 Grundfos Management A/S Pump impeller
US20080213111A1 (en) * 2002-07-12 2008-09-04 Cooper Paul V System for releasing gas into molten metal
US20080304970A1 (en) * 2003-07-14 2008-12-11 Cooper Paul V Pump with rotating inlet
US20080314548A1 (en) * 2007-06-21 2008-12-25 Cooper Paul V Transferring molten metal from one structure to another
US20090269191A1 (en) * 2002-07-12 2009-10-29 Cooper Paul V Gas transfer foot
US7906068B2 (en) 2003-07-14 2011-03-15 Cooper Paul V Support post system for molten metal pump
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
US8529828B2 (en) 2002-07-12 2013-09-10 Paul V. Cooper Molten metal pump components
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
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
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

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US495760A (en) * 1893-04-18 Edward seitz
US882478A (en) * 1905-07-31 1908-03-17 Natural Power Company Pressure-blower.
US882477A (en) * 1905-01-30 1908-03-17 Natural Power Company Centrifugal suction-machine.
US1439365A (en) * 1921-03-16 1922-12-19 Unchokeable Pump Ltd Centrifugal pump
US1470607A (en) * 1922-11-03 1923-10-16 Unchokeable Pump Ltd Impeller for centrifugal pumps
GB330071A (en) * 1929-04-20 1930-06-05 Thomas Balding Cherry Improvements in centrifugal pumps, blowers, exhausters or the like apparatus
GB574079A (en) * 1944-02-18 1945-12-19 F W Brackett & Company Ltd A new or improved centrifugal pump
US2853019A (en) * 1954-09-01 1958-09-23 New York Air Brake Co Balanced single passage impeller pump

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US495760A (en) * 1893-04-18 Edward seitz
US882477A (en) * 1905-01-30 1908-03-17 Natural Power Company Centrifugal suction-machine.
US882478A (en) * 1905-07-31 1908-03-17 Natural Power Company Pressure-blower.
US1439365A (en) * 1921-03-16 1922-12-19 Unchokeable Pump Ltd Centrifugal pump
US1470607A (en) * 1922-11-03 1923-10-16 Unchokeable Pump Ltd Impeller for centrifugal pumps
GB330071A (en) * 1929-04-20 1930-06-05 Thomas Balding Cherry Improvements in centrifugal pumps, blowers, exhausters or the like apparatus
GB574079A (en) * 1944-02-18 1945-12-19 F W Brackett & Company Ltd A new or improved centrifugal pump
US2853019A (en) * 1954-09-01 1958-09-23 New York Air Brake Co Balanced single passage impeller pump

Cited By (64)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4156580A (en) * 1977-08-18 1979-05-29 Pohl Lothar L Wind-turbines
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
DE3519816A1 (en) * 1984-06-06 1985-12-12 Sarlin Ab Oy E pump impeller for
US4614478A (en) * 1984-06-06 1986-09-30 Oy E. Sarlin Ab Pump impeller
US5605434A (en) * 1994-09-30 1997-02-25 Ksb Aktiengesellschaft Impeller having transport elements disposed on a pressure side of a cover disk for a centrifugal pump for dirty liquids
WO2000032938A1 (en) * 1998-11-30 2000-06-08 Smith & Loveless, Inc. Single port impeller
US6123507A (en) * 1998-11-30 2000-09-26 Smith & Loveless, Inc. Single port impeller
US8361379B2 (en) 2002-07-12 2013-01-29 Cooper Paul V Gas transfer foot
US20080213111A1 (en) * 2002-07-12 2008-09-04 Cooper Paul V System for releasing gas into molten metal
US9435343B2 (en) 2002-07-12 2016-09-06 Molten Meal Equipment Innovations, LLC Gas-transfer foot
US9034244B2 (en) 2002-07-12 2015-05-19 Paul V. Cooper Gas-transfer foot
US8178037B2 (en) 2002-07-12 2012-05-15 Cooper Paul V System for releasing gas into molten metal
US8529828B2 (en) 2002-07-12 2013-09-10 Paul V. Cooper Molten metal pump components
US8440135B2 (en) 2002-07-12 2013-05-14 Paul V. Cooper System for releasing gas into molten metal
US8110141B2 (en) 2002-07-12 2012-02-07 Cooper Paul V Pump with rotating inlet
US8409495B2 (en) 2002-07-12 2013-04-02 Paul V. Cooper Rotor with inlet perimeters
US20090269191A1 (en) * 2002-07-12 2009-10-29 Cooper Paul V Gas transfer foot
US6837684B2 (en) 2002-10-25 2005-01-04 Grundfos Management A/S Pump impeller
US8475708B2 (en) 2003-07-14 2013-07-02 Paul V. Cooper Support post clamps for molten metal pumps
US20080304970A1 (en) * 2003-07-14 2008-12-11 Cooper Paul V Pump with rotating inlet
US8075837B2 (en) 2003-07-14 2011-12-13 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
US8501084B2 (en) 2003-07-14 2013-08-06 Paul V. Cooper Support posts for molten metal pumps
US9409232B2 (en) 2007-06-21 2016-08-09 Molten Metal Equipment Innovations, Llc Molten metal transfer vessel and method of construction
US9566645B2 (en) 2007-06-21 2017-02-14 Molten Metal Equipment Innovations, Llc Molten metal transfer system and rotor
US9855600B2 (en) 2007-06-21 2018-01-02 Molten Metal Equipment Innovations, Llc Molten metal transfer system and rotor
US9581388B2 (en) 2007-06-21 2017-02-28 Molten Metal Equipment Innovations, Llc Vessel transfer insert and system
US10072891B2 (en) 2007-06-21 2018-09-11 Molten Metal Equipment Innovations, Llc Transferring molten metal using non-gravity assist launder
US8613884B2 (en) 2007-06-21 2013-12-24 Paul V. Cooper Launder transfer insert and system
US9982945B2 (en) 2007-06-21 2018-05-29 Molten Metal Equipment Innovations, Llc Molten metal transfer vessel and method of construction
US8753563B2 (en) 2007-06-21 2014-06-17 Paul V. Cooper System and method for degassing molten metal
US9643247B2 (en) 2007-06-21 2017-05-09 Molten Metal Equipment Innovations, Llc Molten metal transfer and degassing system
US9017597B2 (en) 2007-06-21 2015-04-28 Paul V. Cooper Transferring molten metal using non-gravity assist launder
US20080314548A1 (en) * 2007-06-21 2008-12-25 Cooper Paul V Transferring molten metal from one structure to another
US8366993B2 (en) 2007-06-21 2013-02-05 Cooper Paul V System and method for degassing molten metal
US9925587B2 (en) 2007-06-21 2018-03-27 Molten Metal Equipment Innovations, Llc Method of transferring molten metal from a vessel
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
US9862026B2 (en) 2007-06-21 2018-01-09 Molten Metal Equipment Innovations, Llc Method of forming transfer well
US9909808B2 (en) 2007-06-21 2018-03-06 Molten Metal Equipment Innovations, Llc System and method for degassing molten metal
US8337746B2 (en) 2007-06-21 2012-12-25 Cooper Paul V Transferring molten metal from one structure to another
US9383140B2 (en) 2007-06-21 2016-07-05 Molten Metal Equipment Innovations, Llc Transferring molten metal from one structure to another
US9382599B2 (en) 2009-08-07 2016-07-05 Molten Metal Equipment Innovations, Llc Rotary degasser and rotor therefor
US9464636B2 (en) 2009-08-07 2016-10-11 Molten Metal Equipment Innovations, Llc Tension device graphite component used in molten metal
US9328615B2 (en) 2009-08-07 2016-05-03 Molten Metal Equipment Innovations, Llc Rotary degassers and components therefor
US9422942B2 (en) 2009-08-07 2016-08-23 Molten Metal Equipment Innovations, Llc Tension device with internal passage
US9080577B2 (en) 2009-08-07 2015-07-14 Paul V. Cooper Shaft and post tensioning device
US9470239B2 (en) 2009-08-07 2016-10-18 Molten Metal Equipment Innovations, Llc Threaded tensioning device
US8524146B2 (en) 2009-08-07 2013-09-03 Paul V. Cooper Rotary degassers and components therefor
US9506129B2 (en) 2009-08-07 2016-11-29 Molten Metal Equipment Innovations, Llc Rotary degasser and rotor therefor
US8449814B2 (en) 2009-08-07 2013-05-28 Paul V. Cooper Systems and methods for melting scrap metal
US8444911B2 (en) 2009-08-07 2013-05-21 Paul V. Cooper Shaft and post tensioning device
US8535603B2 (en) 2009-08-07 2013-09-17 Paul V. Cooper Rotary degasser and rotor therefor
US9377028B2 (en) 2009-08-07 2016-06-28 Molten Metal Equipment Innovations, Llc Tensioning device extending beyond component
US9657578B2 (en) 2009-08-07 2017-05-23 Molten Metal Equipment Innovations, Llc Rotary degassers and components therefor
US8714914B2 (en) 2009-09-08 2014-05-06 Paul V. Cooper Molten metal pump filter
US9108244B2 (en) 2009-09-09 2015-08-18 Paul V. Cooper Immersion heater for molten metal
US9482469B2 (en) 2010-05-12 2016-11-01 Molten Metal Equipment Innovations, Llc Vessel transfer insert and system
US9410744B2 (en) 2010-05-12 2016-08-09 Molten Metal Equipment Innovations, Llc Vessel transfer insert and system
US9903383B2 (en) 2013-03-13 2018-02-27 Molten Metal Equipment Innovations, Llc Molten metal rotor with hardened top
US9011761B2 (en) 2013-03-14 2015-04-21 Paul V. Cooper Ladle with transfer conduit
US9587883B2 (en) 2013-03-14 2017-03-07 Molten Metal Equipment Innovations, Llc Ladle with transfer conduit
US10052688B2 (en) 2013-03-15 2018-08-21 Molten Metal Equipment Innovations, Llc Transfer pump launder system

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