WO2024010786A1 - Turbine à métal fondu avec parre-pierre - Google Patents

Turbine à métal fondu avec parre-pierre Download PDF

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Publication number
WO2024010786A1
WO2024010786A1 PCT/US2023/026891 US2023026891W WO2024010786A1 WO 2024010786 A1 WO2024010786 A1 WO 2024010786A1 US 2023026891 W US2023026891 W US 2023026891W WO 2024010786 A1 WO2024010786 A1 WO 2024010786A1
Authority
WO
WIPO (PCT)
Prior art keywords
impeller
molten metal
pump
rim
top portion
Prior art date
Application number
PCT/US2023/026891
Other languages
English (en)
Inventor
Jason Tetkoskie
Jon Tipton
Original Assignee
Pyrotek, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pyrotek, Inc. filed Critical Pyrotek, Inc.
Publication of WO2024010786A1 publication Critical patent/WO2024010786A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/06—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being hot or corrosive, e.g. liquid metals
    • F04D7/065—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being hot or corrosive, e.g. liquid metals for liquid metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2294—Rotors specially for centrifugal pumps with special measures for protection, e.g. against abrasion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps

Definitions

  • the present exemplary embodiment relates to molten metal impeller with a rock guard. It finds particular application in conjunction with gas injection pumps, and will be described with particular reference thereto. However, it is to be appreciated that the present exemplary embodiment is also amenable to other like applications.
  • molten metal means any metal or combination of metals in liquid form, such as aluminum, copper, iron, zinc, magnesium and alloys thereof.
  • gas means any gas or combination of gases, including argon, nitrogen, chlorine, fluorine, freon, and helium, that are released into molten metal.
  • Known molten-metal pumps include a pump base (also called a housing), one or more inlets (an inlet being an opening in the housing to allow molten metal to enter a pump chamber), a pump chamber which is an open area formed within the housing, and a discharge which is a channel or conduit of any structure or type communicating with the pump chamber (in an axial pump the chamber and discharge may be the same structure or different areas of the same structure) leading from the pump chamber to an outlet, which is an opening formed in the exterior of the housing through which molten metal exits the housing.
  • An impeller is mounted in the pump chamber and is connected to a drive system.
  • the drive system is typically an impeller shaft connected to one end of a drive shaft, the other end of the drive shaft being connected to a motor. As the motor turns the drive shaft, the drive shaft turns the impeller shaft which turns the impeller. The impeller pushes molten metal out of the pump chamber, through the discharge, out of the outlet and into the molten metal bath or a riser.
  • molten metal pumps A number of submersible pumps used to pump molten metal (referred to herein as molten metal pumps) are known in the art.
  • U.S. Pat. No. 2,948,524, U.S. Pat. No. 4,169,584, U.S. Pat. No. 5,203,681 , U.S. Pat. No. 5,947,705 and U.S. Pat. No. 5,993,728 all disclose molten metal pumps.
  • the disclosures of the patents noted above are incorporated herein by reference.
  • Circulation pumps are used to circulate the molten metal within a bath, thereby generally equalizing the temperature of the molten metal. Most often, circulation pumps are used in a reverberatory furnace having an external well. The well is usually an extension of the charging well where scrap metal is charged (i.e. , added).
  • Transfer pumps are generally used to transfer molten metal from the external well of a reverberatory furnace to a different location such as a ladle or another furnace.
  • Gas-injection pumps circulate molten metal while releasing a gas into the molten metal.
  • gases such as hydrogen, or dissolved metals, such as magnesium
  • the removing of dissolved gas is known as "degassing” while the removal of magnesium is known as "demagging”.
  • Gas injection pumps may be used for either of these purposes or for any other application where it is desirable to introduce gas into molten metal.
  • Gas injection pumps generally include a gas-transfer conduit having a first end that is connected to a gas source and a second submerged in the molten metal bath. Gas is introduced into the first end and is released from the second end into the molten metal. The gas may be released downstream of the pump chamber into either the pump discharge or a metaltransfer conduit extending from the discharge, or into a stream of molten metal exiting either the discharge or the metal-transfer conduit.
  • the present impeller design may have particular benefit for use in gas injection pumps because furnaces that use chlorine injection typically accumulate more debris (e.g. magnesium chloride refractory pieces).
  • the present disclosure relates to impellers used for pumping molten metal wherein the impeller has a protective top to alleviate damage to the impeller caused by dross or other hard particles striking the impeller.
  • the present rock guard is advantageous because it expels solid particles before the molten metal enters the chamber of a molten metal pump in which the impeller is retained but does not degrade pump performance.
  • an impeller for use in a molten metal pump comprises (a) a body including a plurality of blades or passages and (b) a top portion having an inverted cup-shape.
  • a top wall of the cup includes a bore configured to receive a shaft.
  • a sidewall includes a plurality of openings.
  • a rim of the cup is mated to the body.
  • a molten metal pump including a superstructure on which a motor is supported and a pump base including a pump chamber is provided.
  • FIG. 1 shows a perspective view of an impeller body according to the present disclosure.
  • FIG. 2 shows a perspective view of a first protective cap design according to the present disclosure.
  • FIG. 3 shows a perspective view of a second protective cap configuration of the present disclosure.
  • FIG. 4 shows a perspective view of an impeller according to the present disclosure disposed in a pump base.
  • the terms about, generally and substantially are intended to encompass structural or numerical modifications which do not significantly affect the purpose of the element or number modified by such term.
  • the term “comprising” may include the embodiments “consisting of” and “consisting essentially of.”
  • the terms “comprise(s),” “include(s),” “having,” “has,” “can,” “contain(s),” and variants thereof, as used herein, are intended to be open-ended transitional phrases, terms, or words that require the presence of the named ingredients/steps and permit the presence of other ingredients/steps.
  • compositions or processes as “consisting of” and “consisting essentially of” the enumerated ingredients/steps, which allows the presence of only the named ingredients/steps, along with any impurities that might result therefrom, and excludes other ingredients/steps.
  • FIG. 1 shows an impeller body according to aspects of the present disclosure.
  • Impeller body 100 as shown has six identical impeller blades (also called “vanes") 102 forming intermediate channels 104.
  • the impeller has a body (or body portion) 103.
  • the impeller body 100 can be constructed of graphite. "Graphite” means any type of graphite, whether or not chemically treated. Graphite is particularly suitable for being formed into pump components because it is soft and relatively easy to machine and less expensive than ceramics.
  • Impeller body 100 may have a bearing plate or ring (not shown) at the bottom edge 105.
  • the bearing plate or ring can be comprised of a hard, wear-resistant material, such as ceramic.
  • ceramics or “ceramic” refers to any oxidized metal (including silicon) or carbon-based material, excluding graphite, capable of being used in the environment of a molten metal bath.
  • Impeller body 100 further includes a connection portion 107 which can be a bore or any structure capable of engaging a drive shaft.
  • a radial edge of each blade 102 includes a recess 109 configured to receive a rock guard cap.
  • the rock guard cap (see Figs. 2 and 3) can be secured to the impeller body 100 by cementing into the recesses 109. Additional spaces 111 may provide openings receiving dowel pins (not shown) or a mechanical cement locking interface that mate with complementary spaces in the rock guard assembly to help secure the rock guard assembly to the impeller body 100.
  • a first rock guard design 200 is shown in FIG. 2.
  • the rock guard 200 is an inverted cup-shaped body having a top wall 202 and a side wall 204.
  • a rim 206 is configured to mate with the impeller body 100 of Fig. 1 .
  • Side wall 204 includes a plurality of openings 208 generally equally spaced about the periphery of the rock guard 200.
  • the openings 208 have at least one dimension that is smaller than an inlet to the channels between adjacent blades or an inlet to the passages of the impeller body.
  • any solids that enter internal chamber 216 will be capable of passing through the impeller body without causing damage.
  • the openings 208 can have a forward canted front 210 and trailing 212 walls (see arrow reflecting intended direction of rotation) to encourage inflow of molten metal.
  • the rock guard 200 further includes a bore 214 which accommodates passage of a shaft for mating with the connection portion 107 of the impeller body 100.
  • the rock guard 200 can form an internal chamber 216 where molten metal is drawn in from a molten metal bath and effectively staged for introduction into the channels 104 between vanes 102 of the impeller body 100.
  • the rock guard advantageously extends above the pump base and pumping chamber (see Fig. 4) such that solids in the molten metal bath are repelled before entering the mechanical interface between impeller and pump housing.
  • the rock guard can be comprised of a ceramic material to better absorb the impact of solids in the molten metal.
  • the interface region 218 between the top wall 202 and the side wall 204 is rounded or beveled.
  • FIG. 3 displays an alternative rock guard design 300.
  • the rock guard 300 is an inverted cup-shaped body having a top wall 302 and a side wall 304.
  • the side wall 304 is inwardly inclined between a rim 306 and the top wall 302.
  • Rim 306 can have a vertical orientation to improve its interface with the surface of the pump base which the rim opposes (see Fig. 4).
  • the bottom surface 307 of the rim can be shaped in any manner to facilitate cementing to the recesses 109 of the impeller body 100.
  • Side wall 304 includes a plurality of openings 308 generally equally spaced about the periphery of the rock guard 300.
  • the bore 314 which accommodates the shaft mating with the connection portion 107 of the impeller body 100 includes a pair of keyways 315 configured to accept a key to improve mating to corresponding keyways on the shaft.
  • the side wall 304 is inwardly inclined between the rim 306 and the top wall 302. It is believed that the inclined side wall can better use the advantages of gravity to encourage molten metal flow into internal chamber 316. To provide the inclined side wall a circumference of the top wall can be less than a circumference of the rim.
  • the incline can be between about 20 and 50 degrees relative to a plane in which the rim 306 resides.
  • the molten metal pump 400 includes a base 402 defining a pumping chamber 404 in which the impeller 405 (the assembly of the components of Figs. 1 + 3) is disposed. Pumping chamber 404 is in fluid communication with outlet 406.
  • the molten metal pump includes a superstructure (not shown) on which a motor is supported.
  • a plurality of support posts 408 connect the superstructure to the pump base 402.
  • a shaft 410 links the motor and the impeller 405 for rotation thereof.
  • a majority of the rock guard 300 portion of impeller 405 extends above an upper surface 412 of the base 402. More particularly, the openings 308 are located above upper surface 412 such that large solid pieces are prevented from entering the impeller where it interfaces with the pump base 402, i.e., locations where a moving impeller abuts non-moving components of the pump assembly.
  • J-50SD pump available from Pyrotek Inc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

L'invention concerne une turbine destinée à être utilisée dans une pompe à métal fondu. La roue comprend (a) un corps comprenant une pluralité de pales ou de passages et (b) une partie supérieure ayant une forme de coupelle inversée. Une paroi supérieure de la coupelle comprend un alésage conçu pour recevoir un arbre. Une paroi latérale comprend une pluralité d'ouvertures. Un rebord de la coupelle est accouplé au corps.
PCT/US2023/026891 2022-07-05 2023-07-05 Turbine à métal fondu avec parre-pierre WO2024010786A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202263358384P 2022-07-05 2022-07-05
US63/358,384 2022-07-05

Publications (1)

Publication Number Publication Date
WO2024010786A1 true WO2024010786A1 (fr) 2024-01-11

Family

ID=89454010

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2023/026891 WO2024010786A1 (fr) 2022-07-05 2023-07-05 Turbine à métal fondu avec parre-pierre

Country Status (1)

Country Link
WO (1) WO2024010786A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010028846A1 (en) * 1997-04-23 2001-10-11 Vild Chris T. Molten metal impeller
US6354796B1 (en) * 1998-08-07 2002-03-12 Alphatech, Inc. Pump for moving metal in a bath of molten metal
US20020146313A1 (en) * 2001-04-06 2002-10-10 Thut Bruno H. Molten metal pump with protected inlet
US20090155042A1 (en) * 2005-03-07 2009-06-18 Thut Bruno H Multi functional pump for pumping molten metal
KR101607428B1 (ko) * 2015-02-09 2016-03-29 김태희 디스크 임펠러를 구비한 펌프

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010028846A1 (en) * 1997-04-23 2001-10-11 Vild Chris T. Molten metal impeller
US6354796B1 (en) * 1998-08-07 2002-03-12 Alphatech, Inc. Pump for moving metal in a bath of molten metal
US20020146313A1 (en) * 2001-04-06 2002-10-10 Thut Bruno H. Molten metal pump with protected inlet
US20090155042A1 (en) * 2005-03-07 2009-06-18 Thut Bruno H Multi functional pump for pumping molten metal
KR101607428B1 (ko) * 2015-02-09 2016-03-29 김태희 디스크 임펠러를 구비한 펌프

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