Positive displacement transfer gear pump for molten metal
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F04C-013/00
B22D-017/08
B22D-017/30
F27D-027/00
F04C-014/04
F04C-002/18
B01D-029/66
B01D-039/20
출원번호
US-0431581
(2017-02-13)
등록번호
US-10197054
(2019-02-05)
발명자
/ 주소
Thut, Bruno H.
출원인 / 주소
Thut, Bruno H.
대리인 / 주소
Abel Law Group, LLP
인용정보
피인용 횟수 :
0인용 특허 :
7
초록▼
A self-cleaning transfer gear pump for transferring molten metal includes the following features: a transfer conduit extends upward from an outlet of a base, two rotatable gears are formed of refractory material and disposed in the gear chamber and engage each other during rotation. A boss functioni
A self-cleaning transfer gear pump for transferring molten metal includes the following features: a transfer conduit extends upward from an outlet of a base, two rotatable gears are formed of refractory material and disposed in the gear chamber and engage each other during rotation. A boss functioning as a bearing extends from the drive gear and is adapted to be received in an opening in the base. A shaft is fastened at a lower end to the drive gear. A filter is fastened to the base so as to cover the inlet and prevents particles and objects in the molten metal from entering the gear chamber. In operational mode, a motor rotates the shaft and the drive gear whereby the drive gear and the second gear engage each other while being rotated so as to positively displace molten metal from the inlet to the outlet and along the transfer conduit to the remote location. In self-cleaning mode, the motor rotates the shaft and the drive gear effectively to draw molten metal from the transfer conduit by positive displacement, through the outlet, and toward the inlet therefore cleaning the filter by removing the particles adhering to the filter. Also included are a system with optional filter and optional self-cleaning mode but including an inlet portion of a die casting machine, and a method for operating the gear pump. A flow sensor may be used to transmit pulses into and from the transfer conduit so as to enable determination of a volume of molten metal being charged. The control of the molten metal volume being charged is not solely controlled by the flow sensor.
대표청구항▼
1. A method of transferring molten fluid using a gear pump and self-cleaning the gear pump comprising: providing a self-cleaning gear pump comprising: a base including an interior gear chamber, an inlet opening at a first side of said base, an outlet opening at a second side of said base, a passagew
1. A method of transferring molten fluid using a gear pump and self-cleaning the gear pump comprising: providing a self-cleaning gear pump comprising: a base including an interior gear chamber, an inlet opening at a first side of said base, an outlet opening at a second side of said base, a passageway extending in a straight line from said inlet opening, through said gear chamber, to said outlet opening, molten fluid flowing in a direction along said passageway, and a shaft opening, said base being formed of refractory material and being adapted to be submerged in the molten fluid;a transfer conduit extending upward from said outlet opening of said base to above a surface of the molten fluid and to a remote location;two rotatable gears formed of refractory material and disposed in said gear chamber, one of said gears being a drive gear and another of said gears being a second gear, wherein said drive gear and said second gear engage each other while being rotated;a shaft formed of refractory material, said shaft passing through said shaft opening and a lower end of said shaft being fastened to said drive gear;a motor to which an upper end of said shaft is rotatably connected, said motor being supported above the molten fluid;a filter fastened to the first side of said base so as to cover said inlet opening and extending perpendicular to the molten fluid flow direction in said passageway, said filter being formed of refractory material that prevents particles and objects in the molten fluid from entering said gear chamber;wherein molten fluid flows in the direction along said passageway, and said flow is between said drive gear and said second gear;conducting an operational mode in which said motor rotates said shaft and said drive gear whereby said drive gear and said second gear engage each other while rotating to positively displace molten fluid from said inlet opening through said passageway, to said outlet opening and along said transfer conduit to the remote location, a small amount of molten fluid remaining in said transfer conduit, and conducting a self-cleaning mode in which said motor rotates said shaft and said drive gear effective to remove the small amount of molten fluid remaining in said transfer conduit by positive displacement, through said outlet opening, along said passageway in the straight line to said inlet opening, thereby enabling the small amount of molten fluid to effectively clean said filter by backflushing, removing the particles adhering to said filter. 2. The method of claim 1 wherein said filter is formed of a ceramic foam. 3. The method of claim 1 wherein said filter is formed of a porous ceramic material. 4. The method of claim 1 wherein said drive gear and said second gear are formed of ceramic material. 5. The method of claim 1 comprising a flow sensor located only exterior to said transfer conduit adapted to transmit pulses into said transfer conduit and to receive pulses from said transfer conduit so as to enable determination of a flow rate of the molten fluid traveling in said transfer conduit and a volume of molten fluid that is transferred. 6. The method of claim 1 comprising: providing a die casting machine forming molten metal into metal articles of specific shapes, said die casting machine including an inlet portion for receiving a charge of molten metal to be formed;wherein said molten fluid is molten metal; andwherein in said operational mode said molten metal that is positively displaced along said transfer conduit is delivered as the charge of molten metal to the inlet portion of said die casting machine. 7. The method of claim 6 wherein said filter is formed of a ceramic foam. 8. The method of claim 6 wherein said filter is formed of a porous ceramic material. 9. The method of claim 6 wherein said drive gear and said second gear are formed of ceramic material and wherein a size thereof and at least one of a size, shape and pitch of teeth on said drive gear and said second gear are selected so that engagement of the teeth of said drive gear and said second gear produce said positive displacement resulting in said charge of molten metal. 10. The method of claim 6 comprising a flow sensor adapted to transmit and receive pulses into and from said transfer conduit that are used to determine a flow rate of molten metal in said transfer conduit and a volume of said charge, said flow sensor only being located exterior to said transfer conduit. 11. The method of claim 10 comprising a controller, wherein the determination of said flow rate and said charge volume using said transmitted and received pulses is carried out by said controller, enabling adjustment of said motor to rotate said gears for a duration that transfers said charge volume of molten metal into the inlet portion of said die casting machine. 12. The method of claim 1 wherein said molten fluid is molten aluminum or unfoamed molten aluminum. 13. The method of claim 1 wherein said gear pump comprises a boss functioning as a bearing extending from said drive gear and being adapted to be received in an opening in said base.
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이 특허에 인용된 특허 (7)
El Dorry, Khaled; Smith, George Edward; Guggari, Mallappa Ishwarappa; Koederitz, William L., Controlled centrifuge systems.
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