US3044408A - Rotary pump - Google Patents

Rotary pump Download PDF

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Publication number
US3044408A
US3044408A US81055A US8105561A US3044408A US 3044408 A US3044408 A US 3044408A US 81055 A US81055 A US 81055A US 8105561 A US8105561 A US 8105561A US 3044408 A US3044408 A US 3044408A
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Prior art keywords
body
blades
rotary pump
impeller
cover plate
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Expired - Lifetime
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US81055A
Inventor
Frank M Mellott
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James A Dingus
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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
    • F04D29/2244Free vortex

Description

July 17, 1962 F. M. MELLOTT ROTARY PUMP Filed Jan. 6, 1961 INVENTbR. FRANK M MELLOT T By @M ,2 W

ATTORNEYS 3,044,408 RQTARY PUM? F rank M. Mellott, Penryn, Calif assignor of one-half to 1 James A. Dingus, Sacramento, Calif.

Filed Jan. 6, 1961, Ser. No. 81,055 1 Claim. (Cl. 103-103) The invention relates to improvements in centrifugal pumps and, more particularly, to rotary pumps capable of handling fluids associated with entrained solid matter.

In the field of rotary pumps adapted to handle slurries or mixtures of fluids and solids, one of the major problems encountered is that of wear. The solids act as highly eifective abrading agents both against the rotating elements and the stationary ones.

It is therefore an object of the invention. to provide a rotary pump which is capable of pumping fluids and fluidsolid mixtures with a minimum of wear.

It is another object of the invention to provide a rotary pump which, with a simple conversion, is capable of han-v dling not only light slurries, such as of wood pulp, but heavy ones, such as sand and gravel mixtures, as well.

It is yet another object of the invention to provide a rotary pump which is relatively inexpensive to manufacture and in which maintenance costs are low.

It is a further object of the invention to provide a ro-' tary pump which is extremely reliable in operation.

It is another object of the invention to provide a generally improved rotary pump.

Other objects, together with the foregoing, are attained in the embodiment described in the following description and shown in the accompanying drawing in which:

FIGURE 1 is a view looking along the axis of the intake pipe, a portion of the housing being removed to show the impeller construction; 4

FIGURE 2 is a section, the plane of the section being indicated by the line 22 in FIGURE 1; and

FIGURE 3 is a view comparable to that of FIGURE 2 but with a modified form of impeller.

While the rotary pump of the invention is susceptible of numerous physical embodiments, depending on the environment and requirements of use, substantial numbers of the herein shown and described embodiments have been made and used, and have performed in an eminently successful manner.

In the form shown in FIGURES 1 and 2, the pump, generally designated by the numeral 12, comprises a hemispherical or bell-shaped body 13, or housing, having at its apex an inlet port 14. The inlet port 14 is symmetrically disposed on a vertical axis 16, it being understood, however, that the pumps use is not restricted to the particular orientation shown in the figures, and that the pump also functions in a highly eflicient manner with the axis 16 in any desired attitude or degree of inclination. The inlet port 14 is defined by an inlet connector 17 threaded or otherwise formed to receive any desired type of inlet pipe 18.

The diametral or base end portion of the hemispherical body 13 terminates in an annular flange 21 provided with a plurality of threaded openings 22 adapted to receive fastenings 23 serving to clamp to the body a circular cover plate 26.

Adjacent the flanged portion of the body 13, the body is provided with an outlet or discharge port 31 and a corresponding outlet pipe 32, the axis 33 of the pipe 32 being at right angles to the inlet pipe axis 16 and parallel to the plane of the cover plate 26.

Adding stiffness to the cover plate 26 and serving, as well, to support the impeller, generally designated by the numeral 41, is a supporting member 42. The supporting member 42 includes a flange 43 mounted concentrically on the cover plate 26, as by fastenings 44, and an up- 2 standing hollow cylindrical boss 46 provided with a suitable journal bearing 47. Disposed within a chamber 48 defined by a shoulder 4 at the lower end of the boss 46 and the cover plate 26 is a fiuid seal 50, of any conventional make.

Rotatably mounted. within the journal 47 and projecting, through an opening 51 in the cover plate, interiorly into the hemispherical chamber 52, formed by the body and the cover plate, is a shaft 56 provided with thread-s 57. Mounted on the threads 57 and keyed thereto as by a member 58 is the impeller 41, or rotor. The shaft 56 is rotated by any conventional power source.

In the form of the device shown in FIGURES l and 2, the impeller comprises a substantially circluar base plate 61 and a plurality of blades 62 mounted thereon. The blades are generally spiralled in transverse cross section, as appears most clearly in FIGURE 1, and the outer periphery of each blade is arcuate in profile with its center of curvature substantially coincident with the center of curvature of the bell-shaped body 13. At their inner ends, the blades are secured to a centrally threaded boss 66 mounted on the base plate 61 and in threaded engagement with the shaft 56.

Owing to the fact that the radial length of each of the blades is only approximately one-half the radial distance between the axis of rotation 16 and the adjacent portion of the flange 21, a substantial volume, in the form of a hollow hemispherical shell, exists between the outer pe riphery or envelope of the rotating impeller blades and the inner wall of the hemispherical body 13. The apparent effect of this geometrical arrangement is to set up a powerful vortex, the centrifugal force of which is suflicient to hurl outwardly the solid particles entrained in the fluid-solid mixture entering through the inlet port 14. In other words, rotation of the impeller creates a strong swirling type of current in the space bounded by the interior walls of the body and the envelope defined by the arcuate outer peripheries of the revolving blades. As a consequence, solids, upon entering through the inlet port, are immediately urged laterally and into the fluid vortex. Centrifugal force tends to keep the solids from impinging on the blades and wear on the blades is thereby minimized.

In the case of mixtures with fairly light entrained solids, the FIGURES land 2 form of the device has been found to be extremely effective in balancing the upward (see FIGURE 2) component of motion resulting from the upward movement of the fluid as it enters the pump and the lateral or horizontal component resulting from centrifugal force. The resultant effect is that the entrained solids are urged into a helical path of increasing diameter, ultimately to discharge through the outlet port, and While the solids are in the helical path they impinge only with minimum frequency against either the blades or the body walls. The precise proportions of the blades relative to the body are determined to some extent by trial and error but the relative dimensions shown in' FIGURE 2 have been found to achieve a very satisfactory flow, with a minimum of wear for many light slurry pumping applications. 1

FIGURE 3, on the other hand, illustrates a modified form which has been utilized with great success in connection with fluid-solid mixtures wherein the entrained solids are heavy and particularly where the solids are of a relatively efficient aerodynamic form, such as rounded particles of gravel, pea gravel, for example. In this situation, the swirl or vortex created by' the impeller takes a longer time to deflect the upwardly moving (FIG- URE 3) solid and in order to avoid impact between the solid particles and the impeller the blades 71 are low in profile and terminate in a plane substantially parallel to the plane of the cover plate 26 at a substantial distance from the apex of the b0dy,'i.e. at a substantial distance from the inlet port 14. 7

It is to be noted that comparable elements in all of the FIGURES are designated by the same reference nu- Ineral. This is done partly for convenience and help in analysis and partly'to illustratethe ease of interchanging the impeller to meet various requirements without having toalter the other components of the pump.

As can be seen most clearly in FIGURE 3, the irnpeller blades 71 are mounted on a base plate 73 and join at a central, hollow, threaded hub 74 mounted onthe threads of a shaft '76 journalled in the bearing 47.

It can therefore be seen that I have provided a highly versatile rotary pump which is especially suitable for use in handling fiuid-solid'mixtures of various kinds.

What is claimed is:

A rotary pump comprising:

(a) a hemispherical body symmetrical about an axis;

said body including an intake port on said axis adjacent the apex of said body and a discharge port transversely disposed with respect to said axis and located adjacent the base of said body;

, (b) a circular cover plate mounted onthe base of said body and disposed at right angles with respect to said axis to form with said body a hemispherical chamber;

(c) a shaft supporting member mounted concentrically on said cover plate; 7

(d) a shaft journalled in-said supporting member and extending through said cover plate into said hemispherical chamber; and

(e) an impeller mounted on said shaft, said impeller including a plurality of convex blades having a cen-- ter of curvature located approximately at the center of curvature of said hemispherical body, each of said blades extending radially a distance equal approximately to one-half the distance between said shaft and the periphery of said cover plate.

References Cited in the file of this patent UNITED STATES PATENTS 765,969 7 Hanson July 26, 1904 2,434,896 Ayers J an. 27, 1948 2,495,895 Hervert Jan. 31, 1950 2,635,548 Brawley Apr. 21, 1953 2,699,764 Kiekhaefer Jan. 18, 1955 2,918,876 Howe Dec. 29, 1959 2,958,293 Praz Nov. 1, 1960 FOREIGN PATENTS 20,216 Great Britain Nov. 9, 1900 613,892 Great Britain Dec. 3, 1948

US81055A 1961-01-06 1961-01-06 Rotary pump Expired - Lifetime US3044408A (en)

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Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3130076A (en) * 1961-09-29 1964-04-21 American Cyanamid Co Continuous vinyl grafting of cellulose
US3190226A (en) * 1963-09-13 1965-06-22 Thomas E Judd Centrifugal pumps
US3308764A (en) * 1965-05-04 1967-03-14 Donald C Walker Pump and drive means therefor
US3322070A (en) * 1966-03-11 1967-05-30 Allis Chalmers Mfg Co Vortex pump
US4932837A (en) * 1988-10-21 1990-06-12 Rymal Ted R Centrifugal pump for liquids
US4998861A (en) * 1988-12-16 1991-03-12 Hitachi, Ltd. Drainage pump
WO2004065796A1 (en) * 2003-01-17 2004-08-05 Ksb Aktiengesellschaft Non-chokable pump
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
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 (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190020216A (en) * 1900-11-09 1901-11-09 Frederic De Mare Mercurial Centrifugal Pump
US765969A (en) * 1903-10-27 1904-07-26 Nils Knut Fredrik Hanson Centrifugal pump.
US2434896A (en) * 1942-08-08 1948-01-27 Ayr Corp Centrifugal impeller
GB613892A (en) * 1945-07-09 1948-12-03 Bbc Brown Boveri & Cie Method of producing centrifugal blowers for supercharging internal combustion engines
US2495895A (en) * 1945-10-31 1950-01-31 Universal Oil Prod Co Fluid circulating device
US2635548A (en) * 1945-12-21 1953-04-21 Brawley Pump Company Rotary pump
US2699764A (en) * 1952-02-14 1955-01-18 Elmer C Kiekhaefer Air cooled internal-combustion engine
US2918876A (en) * 1956-03-01 1959-12-29 Velma Rea Howe Convertible submersible pump
US2958293A (en) * 1955-02-25 1960-11-01 Western Machinery Company Solids pump

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190020216A (en) * 1900-11-09 1901-11-09 Frederic De Mare Mercurial Centrifugal Pump
US765969A (en) * 1903-10-27 1904-07-26 Nils Knut Fredrik Hanson Centrifugal pump.
US2434896A (en) * 1942-08-08 1948-01-27 Ayr Corp Centrifugal impeller
GB613892A (en) * 1945-07-09 1948-12-03 Bbc Brown Boveri & Cie Method of producing centrifugal blowers for supercharging internal combustion engines
US2495895A (en) * 1945-10-31 1950-01-31 Universal Oil Prod Co Fluid circulating device
US2635548A (en) * 1945-12-21 1953-04-21 Brawley Pump Company Rotary pump
US2699764A (en) * 1952-02-14 1955-01-18 Elmer C Kiekhaefer Air cooled internal-combustion engine
US2958293A (en) * 1955-02-25 1960-11-01 Western Machinery Company Solids pump
US2918876A (en) * 1956-03-01 1959-12-29 Velma Rea Howe Convertible submersible pump

Cited By (77)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3130076A (en) * 1961-09-29 1964-04-21 American Cyanamid Co Continuous vinyl grafting of cellulose
US3190226A (en) * 1963-09-13 1965-06-22 Thomas E Judd Centrifugal pumps
US3308764A (en) * 1965-05-04 1967-03-14 Donald C Walker Pump and drive means therefor
US3322070A (en) * 1966-03-11 1967-05-30 Allis Chalmers Mfg Co Vortex pump
US4932837A (en) * 1988-10-21 1990-06-12 Rymal Ted R Centrifugal pump for liquids
US4998861A (en) * 1988-12-16 1991-03-12 Hitachi, Ltd. Drainage pump
US9034244B2 (en) 2002-07-12 2015-05-19 Paul V. Cooper Gas-transfer foot
US20080213111A1 (en) * 2002-07-12 2008-09-04 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
US8409495B2 (en) 2002-07-12 2013-04-02 Paul V. Cooper Rotor with inlet perimeters
US9435343B2 (en) 2002-07-12 2016-09-06 Molten Meal Equipment Innovations, LLC Gas-transfer foot
US20090269191A1 (en) * 2002-07-12 2009-10-29 Cooper Paul V Gas transfer foot
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
US8178037B2 (en) 2002-07-12 2012-05-15 Cooper Paul V System for releasing gas into molten metal
US8361379B2 (en) 2002-07-12 2013-01-29 Cooper Paul V Gas transfer foot
WO2004065796A1 (en) * 2003-01-17 2004-08-05 Ksb Aktiengesellschaft Non-chokable pump
US7906068B2 (en) 2003-07-14 2011-03-15 Cooper Paul V Support post system for molten metal pump
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
US20080304970A1 (en) * 2003-07-14 2008-12-11 Cooper Paul V Pump with rotating inlet
US8501084B2 (en) 2003-07-14 2013-08-06 Paul V. Cooper Support posts for molten metal pumps
US8366993B2 (en) 2007-06-21 2013-02-05 Cooper Paul V System and method for degassing molten metal
US10352620B2 (en) 2007-06-21 2019-07-16 Molten Metal Equipment Innovations, Llc Transferring molten metal from one structure to another
US10345045B2 (en) 2007-06-21 2019-07-09 Molten Metal Equipment Innovations, Llc Vessel transfer insert and system
US10458708B2 (en) 2007-06-21 2019-10-29 Molten Metal Equipment Innovations, Llc Transferring molten metal from one structure to another
US10274256B2 (en) 2007-06-21 2019-04-30 Molten Metal Equipment Innovations, Llc Vessel transfer systems and devices
US8613884B2 (en) 2007-06-21 2013-12-24 Paul V. Cooper Launder transfer insert and system
US10195664B2 (en) 2007-06-21 2019-02-05 Molten Metal Equipment Innovations, Llc Multi-stage impeller for molten metal
US8753563B2 (en) 2007-06-21 2014-06-17 Paul V. Cooper System and method for degassing molten metal
US10072891B2 (en) 2007-06-21 2018-09-11 Molten Metal Equipment Innovations, Llc Transferring molten metal using non-gravity assist launder
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
US9982945B2 (en) 2007-06-21 2018-05-29 Molten Metal Equipment Innovations, Llc Molten metal transfer vessel and method of construction
US9909808B2 (en) 2007-06-21 2018-03-06 Molten Metal Equipment Innovations, Llc System and method for degassing 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
US9862026B2 (en) 2007-06-21 2018-01-09 Molten Metal Equipment Innovations, Llc Method of forming transfer well
US8337746B2 (en) 2007-06-21 2012-12-25 Cooper Paul V Transferring molten metal from one structure to another
US9566645B2 (en) 2007-06-21 2017-02-14 Molten Metal Equipment Innovations, Llc Molten metal transfer system and rotor
US9383140B2 (en) 2007-06-21 2016-07-05 Molten Metal Equipment Innovations, Llc Transferring molten metal from one structure to another
US9409232B2 (en) 2007-06-21 2016-08-09 Molten Metal Equipment Innovations, Llc Molten metal transfer vessel and method of construction
US9643247B2 (en) 2007-06-21 2017-05-09 Molten Metal Equipment Innovations, Llc Molten metal transfer and degassing system
US9581388B2 (en) 2007-06-21 2017-02-28 Molten Metal Equipment Innovations, Llc Vessel transfer insert and system
US9855600B2 (en) 2007-06-21 2018-01-02 Molten Metal Equipment Innovations, Llc Molten metal transfer system and rotor
US9925587B2 (en) 2007-06-21 2018-03-27 Molten Metal Equipment Innovations, Llc Method of transferring molten metal from a vessel
US9080577B2 (en) 2009-08-07 2015-07-14 Paul V. Cooper Shaft and post tensioning device
US8444911B2 (en) 2009-08-07 2013-05-21 Paul V. Cooper Shaft and post tensioning device
US9506129B2 (en) 2009-08-07 2016-11-29 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
US9422942B2 (en) 2009-08-07 2016-08-23 Molten Metal Equipment Innovations, Llc Tension device with internal passage
US10428821B2 (en) 2009-08-07 2019-10-01 Molten Metal Equipment Innovations, Llc Quick submergence molten metal pump
US8449814B2 (en) 2009-08-07 2013-05-28 Paul V. Cooper Systems and methods for melting scrap metal
US9657578B2 (en) 2009-08-07 2017-05-23 Molten Metal Equipment Innovations, Llc Rotary degassers and components therefor
US9382599B2 (en) 2009-08-07 2016-07-05 Molten Metal Equipment Innovations, Llc Rotary degasser and rotor therefor
US9328615B2 (en) 2009-08-07 2016-05-03 Molten Metal Equipment Innovations, Llc Rotary degassers and components therefor
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
US9470239B2 (en) 2009-08-07 2016-10-18 Molten Metal Equipment Innovations, Llc Threaded tensioning device
US9377028B2 (en) 2009-08-07 2016-06-28 Molten Metal Equipment Innovations, Llc Tensioning device extending beyond component
US8714914B2 (en) 2009-09-08 2014-05-06 Paul V. Cooper Molten metal pump filter
US10309725B2 (en) 2009-09-09 2019-06-04 Molten Metal Equipment Innovations, Llc Immersion heater for molten metal
US9108244B2 (en) 2009-09-09 2015-08-18 Paul V. Cooper Immersion heater for molten metal
US9410744B2 (en) 2010-05-12 2016-08-09 Molten Metal Equipment Innovations, Llc Vessel transfer insert and system
US9482469B2 (en) 2010-05-12 2016-11-01 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
US10126059B2 (en) 2013-03-14 2018-11-13 Molten Metal Equipment Innovations, Llc Controlled molten metal flow from transfer vessel
US9587883B2 (en) 2013-03-14 2017-03-07 Molten Metal Equipment Innovations, Llc Ladle with transfer conduit
US10302361B2 (en) 2013-03-14 2019-05-28 Molten Metal Equipment Innovations, Llc Transfer vessel for molten metal pumping device
US10126058B2 (en) 2013-03-14 2018-11-13 Molten Metal Equipment Innovations, Llc Molten metal transferring vessel
US9011761B2 (en) 2013-03-14 2015-04-21 Paul V. Cooper Ladle with transfer conduit
US10322451B2 (en) 2013-03-15 2019-06-18 Molten Metal Equipment Innovations, Llc Transfer pump launder system
US10307821B2 (en) 2013-03-15 2019-06-04 Molten Metal Equipment Innovations, Llc Transfer pump launder system
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
US10465688B2 (en) 2014-07-02 2019-11-05 Molten Metal Equipment Innovations, Llc Coupling and rotor shaft for molten metal devices
US10267314B2 (en) 2016-01-13 2019-04-23 Molten Metal Equipment Innovations, Llc Tensioned support shaft and other molten metal devices

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