WO2021205623A1 - 気泡分散装置およびインペラー - Google Patents

気泡分散装置およびインペラー Download PDF

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Publication number
WO2021205623A1
WO2021205623A1 PCT/JP2020/016035 JP2020016035W WO2021205623A1 WO 2021205623 A1 WO2021205623 A1 WO 2021205623A1 JP 2020016035 W JP2020016035 W JP 2020016035W WO 2021205623 A1 WO2021205623 A1 WO 2021205623A1
Authority
WO
WIPO (PCT)
Prior art keywords
impeller
bubble
blade
molten metal
end portion
Prior art date
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.)
Ceased
Application number
PCT/JP2020/016035
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
藍礼 鈴木
山本　卓也
将也 繁光
諒輔 谷口
保生 石渡
セルゲイ コマロフ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tohoku University NUC
Nippon Light Metal Co Ltd
Original Assignee
Tohoku University NUC
Nippon Light Metal Co Ltd
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 Tohoku University NUC, Nippon Light Metal Co Ltd filed Critical Tohoku University NUC
Priority to JP2022513819A priority Critical patent/JP7109014B2/ja
Priority to PCT/JP2020/016035 priority patent/WO2021205623A1/ja
Publication of WO2021205623A1 publication Critical patent/WO2021205623A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
    • B22D21/04—Casting aluminium or magnesium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/06—Obtaining aluminium refining

Definitions

  • the present invention relates to a bubble disperser and an impeller that blows purified gas into a molten metal.
  • the molten aluminum or aluminum alloy contains impurities such as alkali metal, aluminum carbide, hydrogen gas, and fine powder of furnace material. Impurities with a light specific density are floated and separated by blowing purified gas such as chlorine, nitrogen, and Ar gas into the molten metal as fine bubbles. When the refined gas is blown into the molten metal while generating a vortex, the blown refined gas becomes fine bubbles and is efficiently dispersed in the molten metal to improve the treatment efficiency.
  • impurities with a light specific density are floated and separated by blowing purified gas such as chlorine, nitrogen, and Ar gas into the molten metal as fine bubbles.
  • Patent Document 1 discloses a bubble disperser provided with a rotating shaft having a through hole for purified gas and an impeller fixed to the tip. According to this bubble disperser, the impeller creates a vortex in the molten metal. A covering body having a cylindrical skirt is provided above the impeller, and the molten metal that has infiltrated between the impeller and the covering body is pushed out by the rotation of the impeller and becomes a molten metal circulation flow in the molten metal container. Circulate. The refined gas is blown into the molten metal through an opening provided on the bottom surface of the impeller, and is evenly dispersed throughout the molten metal as fine bubbles on the molten metal circulating flow.
  • the lower end of the skirt portion of the covering body is formed at a position higher than the upper surface of the impeller.
  • the refined gas blown out from the opening on the bottom of the impeller is flowed into the molten metal by the diagonally downward discharge flow generated by the rotation of the impeller.
  • the outer peripheral portion of the lower end portion of the impeller (the portion through which the tip portion of the blade passes) becomes a dividing region in which bubbles of the purified gas are efficiently divided, and when the purified gas passes through the dividing region, it is finely divided. Will be done.
  • the radial dimension of the impeller blade is large, a part of the refined gas passes through the gap between the base ends of the blade near the center of the impeller and escapes upward without passing through the divided region. Therefore, it may remain as a large bubble. That is, there is room for improvement in the dispersion efficiency of bubbles.
  • an object of the present invention is to provide a bubble disperser and an impeller capable of efficiently dividing bubbles.
  • the first invention for solving such a problem is a bubble dispersion device for blowing a purified gas into a molten metal, which is attached to a rotating shaft provided with a through hole for supplying the purified gas and to the lower end of the rotating shaft. It is equipped with an impeller that can be used.
  • the impeller is adjacent to a central body portion having a gas ejection hole communicating with the through hole, and a plurality of blade portions arranged at equal intervals in the circumferential direction of the impeller and inclined with respect to the axial direction of the impeller. It is characterized by including a bubble guiding portion that covers a gap between the matching blade portions.
  • the purified gas ejected from the gas ejection hole is flowed to the tip of the blade portion by the bubble induction portion.
  • the bubbles of the purified gas are efficiently divided. As a result, finely divided bubbles can be efficiently dispersed in the molten metal.
  • the upper surface of the bubble guiding portion is inclined so that the base end portion of the blade portion is higher and the tip end portion of the blade portion is lower. According to such a configuration, as the impeller rotates, the molten metal flows along the upper surface of the bubble induction portion and is rectified, so that the discharge amount of the discharge flow generated diagonally downward from the outer peripheral portion of the impeller is large. Become. As a result, a circulating flow is generated in the molten metal, and the refined gas spreads throughout the molten metal.
  • the outer end portion of the bubble induction portion is located closer to the base end portion than the tip end of the blade portion. According to such a configuration, the purified gas ejected from the gas ejection hole flows into the divided region of the tip portion of the blade portion by the bubble induction portion, then starts to float and collides with the tip portion of the blade portion. , Even more efficiently divided.
  • the bottom surface of the bubble induction portion is flush with the bottom surface of the blade portion. According to such a configuration, the purified gas ejected from the gas ejection hole is smoothly flowed to the outer peripheral side along the bottom surface of the blade portion and the bubble guiding portion.
  • the second invention for solving the above problems is an impeller used in a bubble disperser for blowing purified gas into a molten metal.
  • the central body portion having a gas ejection hole for supplying the refined gas from the lower surface, and a plurality of blade portions arranged at equal intervals in the circumferential direction of the impeller and inclined with respect to the axial direction of the impeller are adjacent to each other. It is characterized in that it is provided with a bubble guiding portion that covers the gap between the blade portions.
  • the purified gas ejected from the gas ejection hole becomes bubbles as in the invention according to claim 1. It is flushed to the tip of the blade by the guide. In the bubble dividing region through which the tip of the blade portion passes, the bubbles of the purified gas are efficiently divided. As a result, finely divided bubbles can be efficiently dispersed in the molten metal.
  • the upper surface of the bubble induction portion is inclined so that the base end portion of the blade portion is high and the tip end portion of the blade portion is low. Further, the outer end portion of the bubble induction portion is preferably located closer to the base end portion side than the tip end portion of the blade portion. Further, the bottom surface of the bubble induction portion is preferably flush with the bottom surface of the blade portion.
  • air bubbles in the molten metal can be efficiently separated.
  • FIG. 1A is a cross-sectional view taken along the line AA of FIG. 1A.
  • FIG. 1B is a cross-sectional view taken along the line BB of FIG. 1A. It is a perspective view for demonstrating the shape of the impeller which concerns on embodiment of this invention.
  • the bubble disperser 1 is a device in which purified gas is blown into the molten metal M as fine bubbles to float and separate impurities.
  • the metal is, for example, aluminum or an aluminum alloy.
  • the bubble disperser 1 according to the present embodiment includes a rotating shaft 10 and an impeller 20.
  • the rotating shaft 10 is made of graphite, ceramics, etc., which have excellent heat resistance and can withstand erosion by molten metal.
  • the rotating shaft 10 includes a through hole 11 extending in the axial direction.
  • the through hole 11 is a flow path for supplying purified gas, and is formed over the entire length of the rotating shaft 10.
  • a male screw portion 12 screwed into the female screw portion 25 of the impeller 20 is formed at the lower end of the rotating shaft 10.
  • the male screw portion 12 is oriented so as to be tightened to the female screw portion 25 of the impeller 20 when the rotation shaft 10 is turned with respect to the impeller 20 in the rotation direction of the impeller 20.
  • the impeller 20 is made of the same material as the rotating shaft 10 and is attached to the lower end of the rotating shaft 10. As shown in FIGS. 1 to 4, the impeller 20 includes a central body portion 21, a blade portion 22, and a bubble guiding portion 23.
  • the central body portion 21 is located at the center of rotation of the impeller 20 and extends in the vertical direction.
  • a gas ejection hole 24 communicating with the through hole 11 is formed in the central body portion 21.
  • the gas ejection hole 24 penetrates the central body portion 21 in the vertical direction.
  • the upper end of the gas ejection hole 24 has an enlarged diameter, and a female screw portion 25 is formed on the inner peripheral surface.
  • the male screw portion 12 of the rotating shaft 10 is screwed into the female screw portion 25.
  • a plurality of blade portions 22 are provided around the central body portion 21 for stirring the molten metal M.
  • the blade portions 22 are arranged at equal intervals in the circumferential direction, and extend radially outward from the central body portion 21.
  • the upper surface 22a and the lower surface 22b of the blade portion 22 are offset from the center of the shaft portion of the impeller 20 by a predetermined angle (30 ° in this embodiment). Both the upper surface 22a and the lower surface 22b are horizontal.
  • the front end surface 22c connecting the upper surface 22a and the lower surface 22a and the side surfaces 22d and 22e are inclined, respectively.
  • the center line connecting (extending in the vertical direction) the intermediate portion in the width direction of the tip surface 22c is inclined with respect to the axial direction of the impeller 20.
  • One side surface 22d faces diagonally upward, and the other side surface 22e faces diagonally downward.
  • the inclination angle of the blade portion 22 is 30 to 60 ° in consideration of the thrust applied to the molten metal M and the driving force required for the rotation of the impeller 20. It is preferably in the range of.
  • the bubble induction unit 23 guides the purified gas ejected from the gas ejection hole 24 toward the tip end side of the blade portion 22.
  • the bubble guiding portion 23 covers the gap between the blade portions 22 and 22 adjacent to each other in the circumferential direction with a predetermined length from the base end portion to the tip end side of the blade portion 22.
  • the bubble induction portions 23 are provided at six locations corresponding to the six blade portions 22, 22 ...
  • the tip end portion (outer end portion) of the bubble induction portion 23 is located at a portion that is closer to the base end portion side than the tip end portion of the blade portion.
  • the upper surface of the bubble guiding portion 23 is inclined so that the blade portion 22 is higher toward the base end portion and the blade portion 22 is lower toward the tip end portion.
  • the upper end of the base end portion of the bubble induction portion 23 is at the same height as the upper surface of the blade portion 22.
  • the bottom surface of the bubble induction portion 23 is flush with the bottom surface of the blade portion 22.
  • the male screw portion 12 of the rotating shaft 10 is screwed into the female screw portion 25 of the impeller 20.
  • the surface around the base end portion of the male screw portion 12 of the rotary shaft 10 is pressed against the upper surface of the impeller 20, so that the impeller 20 is in close contact with the rotary shaft 10 without a gap.
  • the male screw portion 12 is formed so as to be tightened when the impeller 20 rotates, the male screw portion 12 can be firmly crimped to the impeller 20 without loosening the screw during operation.
  • the molten metal M to which thrust is applied by the blades 22 is sent out into the molten metal container 2.
  • the molten metal M is urged downward by the blade portion 22 and rectified along the upper surface of the bubble induction portion 23, and is sent out from the lower portion of the outer peripheral portion of the impeller 20 diagonally downward to the outside. Since the rectification is performed on the upper surface of the bubble induction unit 23, the discharge amount of the discharge flow of the molten metal M to be sent out becomes large, so that a circulating flow is generated in the molten metal container 2.
  • Bubbles G of purified gas ejected from the gas ejection hole 24 are flowed to the tip of the blade portion 22 by the bottom surface of the impeller 20 including the bottom portion of the bubble induction portion 23.
  • the tip of the blade 22 has a high peripheral speed, and the corner of the tip of the blade 22 cuts through air bubbles. That is, the portion through which the tip portion of the blade portion 22 passes becomes the divided region of the bubble G. In the divided region, the bubbles G of the purified gas are efficiently divided.
  • the bubbles G are induced in the divided region by providing the bubble guiding portion 23, so that the bubbles G are efficiently divided. be able to.
  • the bubbles G are finely divided, the surface area thereof is increased and the deimpuration reaction of the molten metal M is promoted.
  • the bubble G is easily guided to the divided region. Specifically, most of the bubbles G of the purified gas ejected from the gas ejection hole 24 flow to the outer end of the bubble guiding portion 23 along the bottom surface of the bubble guiding portion 23, and then begin to rise. Since it collides with the tip corner portion of the blade portion 22 in the dividing region, the blade portion 22 is divided more efficiently. Further, since the bottom surface of the bubble guiding portion 23 is flush with the bottom surface of the blade portion 22, the bubble G is smoothly flowed to the outer peripheral side along the bottom surface of the blade portion 22 and the bubble guiding portion 23.
  • the bubbles G efficiently divided in the divided region are dispersed over the entire molten metal M by the circulating flow of the molten metal M.
  • the bubble dispersing device 1 and the impeller 20 since the bubble G is guided to the outer peripheral portion of the impeller 20 by the bubble guiding portion 23, it is not necessary to provide a covering body as in the conventional case. Therefore, the number of components of the bubble dispersion device 1 can be reduced, and the manufacturing cost can be reduced.
  • the design of the present invention can be appropriately changed within a range not contrary to the gist thereof.
  • the inclined surface of the upper surface of the bubble guiding portion 23 is flat, but may be curved. According to such a configuration, the flow of the molten metal M may be made smoother.
  • the bottom surface of the bubble guiding portion 23 is flush with the bottom surface of the blade portion 22, but for example, a step may be provided so that the bottom surface of the bubble guiding portion 23 is one step higher. According to such a configuration, the bubble G can be guided to the gap between the blades 22 and 22 at the outer end of the bubble guiding portion 23, and the division efficiency can be further improved.
  • the bubble disperser 1 is immersed in the molten metal M so that the rotation axis 10 is vertical, but the present invention is not limited to this.
  • the bubble disperser 1 may be arranged so that the rotating shaft 10 is slanted. According to such a configuration, a circulating flow of the molten metal M may easily occur.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Charging Or Discharging (AREA)
PCT/JP2020/016035 2020-04-09 2020-04-09 気泡分散装置およびインペラー Ceased WO2021205623A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2022513819A JP7109014B2 (ja) 2020-04-09 2020-04-09 気泡分散装置およびインペラー
PCT/JP2020/016035 WO2021205623A1 (ja) 2020-04-09 2020-04-09 気泡分散装置およびインペラー

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/016035 WO2021205623A1 (ja) 2020-04-09 2020-04-09 気泡分散装置およびインペラー

Publications (1)

Publication Number Publication Date
WO2021205623A1 true WO2021205623A1 (ja) 2021-10-14

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WO (1) WO2021205623A1 (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024150665A1 (ja) * 2023-01-12 2024-07-18 三井金属鉱業株式会社 金属溶湯用インペラおよび金属溶湯用攪拌体

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04123250U (ja) * 1991-04-25 1992-11-06 日立金属株式会社 ガス吹込みローター

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3465624B2 (ja) 1999-04-23 2003-11-10 日本軽金属株式会社 溶湯への気泡分散装置
US6689310B1 (en) * 2000-05-12 2004-02-10 Paul V. Cooper Molten metal degassing device and impellers therefor
JP2004162102A (ja) 2002-11-12 2004-06-10 Akechi Ceramics Co Ltd 溶融金属の脱ガス清浄化装置
JP6196533B2 (ja) 2013-11-06 2017-09-13 三井金属鉱業株式会社 脱ガス装置、脱ガス処理方法、金属溶湯用攪拌体およびその製造方法
JP6317604B2 (ja) 2014-03-20 2018-04-25 東京窯業株式会社 気泡の放出分散装置
JP6954589B2 (ja) 2017-04-14 2021-10-27 日本金属化学株式会社 撹拌機及び溶湯処理装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04123250U (ja) * 1991-04-25 1992-11-06 日立金属株式会社 ガス吹込みローター

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024150665A1 (ja) * 2023-01-12 2024-07-18 三井金属鉱業株式会社 金属溶湯用インペラおよび金属溶湯用攪拌体

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JP7109014B2 (ja) 2022-07-29
JPWO2021205623A1 (https=) 2021-10-14

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