Rotary stirring apparatus for dispersing gas during melting metal

A technology of rotating stirring and dispersing gas, applied in stirring devices, furnaces, lighting and heating equipment, etc., can solve the problems of slow gas diffusion, large bubble dispersion, low degassing efficiency, etc., and achieve accelerated diffusion and strong shearing effect. , the effect of good stirring force

Inactive Publication Date: 2017-06-30
珠海肯赛科有色金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The disadvantage of the above technical solution is that the generated bubbles are large and the degree of dispersion is poor, the gas diffusion is slow, and the degassing efficiency is low

Method used

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  • Rotary stirring apparatus for dispersing gas during melting metal
  • Rotary stirring apparatus for dispersing gas during melting metal
  • Rotary stirring apparatus for dispersing gas during melting metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1 (no drainage groove)

[0040] Such as figure 1 As shown, the present embodiment provides a rotary stirring device for dispersing gas in molten metal. The rotary stirring device includes a hollow rotating shaft and a rotating nozzle, and the bottom end of the hollow rotating shaft is connected to the rotating nozzle; the rotating nozzle includes: top plate 1, Bottom plate 2, four dividing plates 3.

[0041] Wherein, the thickness of top plate 1 is greater than bottom plate 2; The cross-sectional outline of top plate 1 is the first octagon, and the first octagon includes four upper long sides 101 and four upper short sides 102, and upper long side 101 and upper short side 102 are arranged at intervals; the upper short side 102 is an outward convex arc, and the upper long side 101 is an inner concave arc. The four upper long sides 101 are symmetrical to the center of the rotation axis; the four upper short sides 103 are symmetrical to the center of the rotat...

Embodiment 2

[0046] Embodiment 2 (with drainage groove)

[0047] Such as Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that: the lower surface of the bottom plate 2 is provided with a drainage groove 5; the drainage groove 5 is a groove with a semicircular cross section, one end of which is flush with the lower short side, and the other end communicates Lower circular hole 203. The drainage slots are not pointing towards the axis of rotation, but are offset by an angle (3°-10°). There are four drainage grooves, and each drainage groove is located under a partition; the four drainage grooves are symmetrical about the center of the rotation axis. Drainage slots are arranged correspondingly to the partitions, and a drainage slot is provided under each partition. The depth of the drainage groove is 1 / 3-2 / 3 of the thickness of the bottom plate.

[0048] Figure 7 Shown are the degassing efficiency comparison curves of this embodiment (HDRII) and embodiment ...

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Abstract

The invention provides a rotary stirring apparatus for dispersing gas during melting metal. The rotary stirring apparatus comprises a hollow rotary shaft and a rotary nozzle, wherein the bottom end of the hollow rotary shaft is connected with the rotary nozzle; the rotary nozzle comprises a top plate, a bottom plate and a partition plate; the outer contour of the cross section of the top plate is a first octagon; the first octagon comprises four upper long sides and four upper short sides; the four upper long sides and four upper short sides are arranged at intervals; an upper circular hole is formed in the center of the top plate; the outer contour of the cross section of the bottom plate is a second octagon; the second octagon comprises four lower long sides and four lower short sides; the four lower long sides and four lower short sides are arranged at intervals; a lower circular hole is formed in the center of the bottom plate; the diameter of the lower circular hole is greater than that of the upper circular hole; the partition plate is positioned between the top plate and the bottom plate; and upper and lower ends of the partition plate are connected with the top plate and the bottom plate. According to the invention, the outer contour of the cross section of each of the top plate and the bottom plate is the octagon, and compared with the circle in the prior art, the octagon has higher stirring force, larger stirring range and higher shearing action to gas to generate more disperse fine bubbles with a larger covering range; and a drainage groove is arranged to guide flow of gas so as to accelerate diffusion of gas.

Description

technical field [0001] The invention relates to a rotary stirring device for dispersing gas in molten metal. Background technique [0002] The presence of dissolved gases in the molten metal can cause forming defects. For example, porosity due to the presence of hydrogen can cause some defects in aluminum or aluminum alloy castings and wrought products. Specifically, hydrogen seeps out to create voids and discontinuities (such as oxide impurities) that lead to porosity during production of aluminum alloy plates, sheets, strips, and other defects such as porosity in castings are also associated with the presence of hydrogen. At present, when processing molten aluminum and aluminum alloys, it is common practice to remove hydrogen and solid impurities by purging with gases such as chlorine, argon, nitrogen or a mixture of these gases. This process is called "degassing". One way of accomplishing degassing is to use a hollow shaft to which a rotor is attached. In use, the shaft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D27/00
CPCF27D27/00F27D2027/002
Inventor 陈思园
Owner 珠海肯赛科有色金属有限公司
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