CN101555555A - Aluminum melt hydrogen-removing rotary blowing device - Google Patents
Aluminum melt hydrogen-removing rotary blowing device Download PDFInfo
- Publication number
- CN101555555A CN101555555A CNA2009100307790A CN200910030779A CN101555555A CN 101555555 A CN101555555 A CN 101555555A CN A2009100307790 A CNA2009100307790 A CN A2009100307790A CN 200910030779 A CN200910030779 A CN 200910030779A CN 101555555 A CN101555555 A CN 101555555A
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- CN
- China
- Prior art keywords
- gas
- bubble
- aluminum melt
- airway
- hydrogen
- 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.)
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 46
- 238000007664 blowing Methods 0.000 title abstract description 7
- 239000007789 gas Substances 0.000 claims abstract description 46
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000001257 hydrogen Substances 0.000 claims abstract description 27
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 27
- 239000011148 porous material Substances 0.000 claims description 19
- 210000000515 tooth Anatomy 0.000 claims description 16
- 238000009792 diffusion process Methods 0.000 claims description 7
- 238000009827 uniform distribution Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 11
- 238000005096 rolling process Methods 0.000 abstract description 2
- 239000004411 aluminium Substances 0.000 description 27
- 238000006356 dehydrogenation reaction Methods 0.000 description 20
- 239000007788 liquid Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 11
- 238000007872 degassing Methods 0.000 description 8
- 238000010008 shearing Methods 0.000 description 8
- 238000005266 casting Methods 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 238000013019 agitation Methods 0.000 description 2
- 239000000274 aluminium melt Substances 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000009182 swimming Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
A rotary blowing device for removing hydrogen from an aluminum melt comprises an air guide pipe and a gas nozzle, wherein the gas nozzle is positioned at the lower end of the air guide pipe, the circle center of the gas nozzle is provided with a gas hole communicated with the air guide pipe, and the diameter of the gas hole is 5-8 mm; the gas nozzle has the advantages that the structure is simple and reasonable, the gas in the gas guide tube can be efficiently crushed, sheared and refined, the bubbles are uniformly distributed in the aluminum melt, the surface of the aluminum melt is effectively prevented from violently rolling in the process of removing hydrogen by rotary blowing, and the hydrogen removal efficiency is obviously improved.
Description
One, technical field
The invention belongs to the aluminium melt purifying process field, particularly a kind of swiveling jetting device that is used for removing hydrogen from aluminum melt.
Two, background technology
The aluminum alloy casting that is used for high pressure power transmission and distribution and medicine equipment, should bear high interior pressure, except must strict control chemical ingredients, physicals, mechanical property and the dimensional precision, also do not allow the defective of surface and inner quality aspect, as shrinkage cavity, pore, loosen etc.The quality of aluminum alloy casting directly depends on the quality of melt quality.Therefore, purifying aluminium alloy melt is extremely important.Hydrogen is unique gas that can be dissolved in a large number in the molten aluminium, gas in molten aluminium, hydrogen has accounted for more than 80%, this viewpoint has been extracted the spectral analysis data of gas and has confirmed with the test-results that the palladium sheet filters the hydrogen gained, so can think that the degasification to molten aluminium just is meant dehydrogenation.
The swiveling jetting device that is applied to removing hydrogen from aluminum melt at present roughly adopts three boss structures, utilizes three boss that the bubble of ejection is pulverized, and drives the rotation generation turbulent flow of bottom molten aluminium, further reduces bubble.The above-mentioned shortcoming part of swiveling jetting device commonly used at present is: on the one hand, three boss can not obtain very tiny bubble to the grindability deficiency of bubble; On the other hand, the stirring capacity of three boss is limited, can not make the molten aluminium of bottom produce very big turbulent flow; Even increase the speed of rotation of shower nozzle, can improve the turbulent flow of bottom molten aluminium, but drive the rotation of surfaces of aluminum melt simultaneously, form very big whirlpool, cause the air-breathing of molten aluminium.
Three, summary of the invention
Technical problem:
The present invention is directed to the deficiencies in the prior art, provide a kind of structure more rational removing hydrogen from aluminum melt rotary nozzle, this shower nozzle can produce more tiny, uniform bubble in carrying out the dehydrogenation process, reaching increases specific surface area, the increase mass transfer diffusibility of removing bubble hydrogen, thereby produces dehydrogenation effect preferably.
Technical scheme: technical solution of the present invention is:
A kind of swiveling jetting device for removing hydrogen from aluminum melt comprises airway and gas tip, and gas tip is positioned at the lower end of airway, and the circle centre position of gas tip is provided with the pore that communicates with airway; A uniform distribution 6-10 heel teeth on the circumference of gas tip on the gas tip body between each heel teeth and adjacent two heel teeths, forms radial groove, the gas in the airway by behind the pore to around diffusion, smashed by groove, outwards move along groove then.
As of the present invention a kind of preferred, the diameter of described pore is 5-8mm.
As of the present invention a kind of preferred, the width of described groove is 3-5mm.
As of the present invention a kind of preferred, the number that evenly forms heel teeth on the circumference of gas tip is 6.
As of the present invention a kind of preferred, described gas tip is by being threadedly connected to the lower end of airway.
Beneficial effect:
The invention provides a kind of rotary nozzle that is used for removing hydrogen from aluminum melt.
Remove the principle of hydrogen purification according to the bubble method of swimming, the dehydrogenation process of aluminium liquid should occur in melt inside, and the hydrogen atom that is dissolved in the aluminium liquid moves to inertia bubble periphery, is adsorbed at the bubble periphery, and be combined into hydrogen molecule and enter bubble, upwards swim with bubble at last and effusion aluminium liquid.Rotary nozzle of the present invention mainly reaches following some effect in design:
(1) increase number of bubbles as far as possible in the dehydrogenation process, bubbles number is big more, and the specific surface area of gas-to-liquid contact effect is just big more.
(2) in the dehydrogenation process, reduce bubble diameter as far as possible, under identical gas supply flow, bubble size is little, then the bubbles number nature is many, thereby effectively increase the specific surface of gas-to-liquid contact effect, and, promptly increase agitation strength not causing the movement velocity of increase bubble in aluminium liquid under the prerequisite of splashing in aluminium liquid surface, strengthen the gas-liquid surface turnover rate, increase mass transfer coefficient.
(3) make bubble uniform distribution in molten aluminium as far as possible in the dehydrogenation process, dissolved hydrogen is to the distance of bubble diffusion in the aluminium liquid thereby effectively reduce, and the bubble uniform distribution is equivalent to strengthen diffusion process or mass transfer ability.
(4) prolong the distance that bubble rises and swims as far as possible in the dehydrogenation process in aluminium liquid, increasing bubble has enough residence time in aluminium liquid, the potential of bubble dehydrogenation is not fully exerted, and also is equivalent to increase the dehydrogenation time of bubble.
The different shower nozzle of geometrical shape is to the stirring extent difference of liquid, and the turbulence level that therefore causes producing the size of bubble and liquid is also different.Different shower nozzles, under identical speed of rotation, because high turbulent region is different with the area of low turbulent region, bubble splitting, the probability difference of merging also has a significant impact the size of bubble.Therefore, the structure of rotary nozzle and shape have very big influence to hydrogen degassing efficiency, and, disperse tiny to obtaining, finely dispersed aeration are very big, also are the key factors that influences final hydrogen content of aluminium alloy and dehydrogenation efficient.
Rotary blowing rare gas element under shower nozzle of the present invention, gas breaks away from airway just to diffusion all around, increase along with linear velocity, bubble is at first smashed by groove, gas outwards moves along groove, is sheared when arriving the edge of groove to throw away, and bubble diameter is reduced once more, and further pulverized by tooth, make bubble diameter littler.The increasing of tooth increased shower nozzle to the bottom molten aluminium stirring, produce the intensive turbulent flow, bubble is subjected to the effect of the turbulent shearing stress that LAYER FLUID produces, when greater than the ability to bear of bubble, just therefrom cut off, be split into two bubbles, the diameter of bubble is reduced once more.The splitted bubble is caught by other tangent liquid level again, just can continue to split into littler bubble, up to the shearing stress deficiency between LAYER FLUID so that till the sphere of action of bubble breaking or this shearing stress of bubble disengagement, thereby can produce more tiny than single tube or multitube, uniform more bubble, effectively increase specific surface area, also effectively increase the mass transfer diffusibility, degassing effect is fine.
In the design of pore opening, the diameter of pore should be 5-8mm, if the diameter of pore is too small, will have influence on air flow when less than 5mm, makes the gas volume that feeds in the identical time reduce, and will reduce degassing effect like this; If the diameter of pore is excessive, when greater than 8mm, can increase the feeding amount of gas on the one hand, increase production cost; The diameter of the bubble when breaking away from pore is increased, make the diameter of bubble after treatment increase, also can reduce degassing efficiency.
In the design of recess width, the width of groove is 3-5mm, if the diameter of groove is too small, when less than 3mm, the ability drop of the stirring that groove plays makes the turbulent flow of bottom molten aluminium reduce, and turbulent shearing stress reduces, and the effect of pulverizing bubble descends; If the diameter of groove is excessive, very big during the bubble disengagement pore when greater than 5mm by the bubble diameter after the grooves disperse, and reduced the agitation capability of groove, make the effect of degasification descend.
The present invention is simple and reasonable, not only can pulverize efficiently, shearing, bubble disintegration, and make bubble be distributed in the molten aluminium uniformly, and avoided in rotary blowing dehydrogenation process aluminium melt surface to produce violent rolling effectively, simultaneously, also avoided destroying the phenomenon of bath surface layer, made that melt significantly reduces from airborne suction hydrogen in the dehydrogenation process, thereby improved hydrogen degassing efficiency significantly owing to the existence of baffle plate.
Four, description of drawings
Fig. 1 is a swiveling jetting device for removing hydrogen from aluminum melt structural representation of the present invention;
Fig. 2 is the structural representation of gas tip of the present invention;
Among the figure: the 1-airway; The 2-gas tip; The 3-pore; The 4-heel teeth; The 5-groove;
After Fig. 3 was common rotary nozzle winding-up dehydrogenation, molten aluminium left standstill the metallograph that obtained sample in 10 minutes;
After Fig. 4 was shower nozzle winding-up dehydrogenation of the present invention, molten aluminium left standstill the metallograph that obtained sample in 10 minutes.
Five, embodiment
Following examples are more of the present invention giving an example, and should not regarded as limitation of the invention.
Embodiment 1:
A kind of swiveling jetting device for removing hydrogen from aluminum melt comprises airway 1 and gas tip 2, and gas tip 2 is to be threadedly connected to the lower end of airway 1, and the circle centre position of gas tip 2 is provided with the pore 3 that communicates with airway 1, and the diameter of pore 3 is 5-8mm; A uniform distribution 6-10 heel teeth 4 on the circumference of gas tip 2, on gas tip 2 bodies between each heel teeth 4 and adjacent two heel teeths 4, form radial groove 5, the width of groove 5 is 3-5mm, gas in the airway 1 passes through pore 3 backs to diffusion all around, smashed by groove 5, move along groove 5 then.
Rotary blowing rare gas element under shower nozzle of the present invention, gas arrives gas tip 2 by airway 1, back by pore 3 to diffusion all around, along with the increase of linear velocity, bubble is at first smashed by groove 5, and gas outwards moves along groove 5, be sheared when arriving the edge of groove 5 and throw away, bubble diameter is reduced once more, and is further pulverized by heel teeth 4, makes bubble diameter littler.The increasing of heel teeth 4 increased by 2 pairs of bottoms of gas tip molten aluminium stirring, produce the intensive turbulent flow, bubble is subjected to the effect of the turbulent shearing stress that LAYER FLUID produces, when greater than the ability to bear of bubble, just therefrom cut off, be split into two bubbles, the diameter of bubble is reduced once more.The splitted bubble is caught by other tangent liquid level again, just can continue to split into littler bubble, up to the shearing stress deficiency between LAYER FLUID so that till the sphere of action of bubble breaking or this shearing stress of bubble disengagement, thereby can produce more tiny than single tube or multitube, uniform more bubble, effectively increase specific surface area, also effectively increase the mass transfer diffusibility, degassing effect is fine.
Embodiment 2:
Use existing common swiveling jetting device and swiveling jetting device of the present invention, under identical ventilation flow rate, carry out removing hydrogen from aluminum melt respectively, the rotary blowing time equates, get molten aluminium casting coupon four moment respectively after winding-up finishes and test, the mechanical property contrast that obtains product is as shown in the table respectively:
Table one: utilize the dehydrogenation of jetting of existing common rotary nozzle:
Table two: utilize the swiveling jetting device of the present invention dehydrogenation of jetting:
By table one and table two as seen, the molten aluminium casting coupon that utilizes swiveling jetting device of the present invention to jet to obtain after the dehydrogenation obviously is being better than the molten aluminium casting coupon that existing common swiveling jetting device is jetted and obtained after the dehydrogenation on tensile strength and the elongation after fracture.
In addition, after two kinds of shower nozzles are handled, molten aluminium leaves standstill the metallograph of the sample that obtained in 10 minutes shown in accompanying drawing 3 and accompanying drawing 4, utilize as can be seen by metallograph that the pore of resulting molten aluminium obviously reduces after the swiveling jetting device of the present invention winding-up dehydrogenation, the sample pinhole rate that obtains under the prior art shower nozzle only can reach 3 grades, and the sample pinhole rate that the present invention obtains can access near 1 grade of level.
Claims (5)
1. swiveling jetting device for removing hydrogen from aluminum melt, comprise airway (1) and gas tip (2), gas tip (2) is positioned at the lower end of airway (1), the circle centre position of gas tip (2) is provided with the pore (3) that communicates with airway (1), it is characterized in that: a uniform distribution 6-10 heel teeth (4) on the circumference of gas tip (2), each heel teeth (4) upward and on gas tip (2) body between adjacent two heel teeths (4) forms radial groove (5), gas in the airway (1) passes through pore (3) back to diffusion all around, smashed by groove (5), then along outwards motion of groove (5).
2. swiveling jetting device for removing hydrogen from aluminum melt according to claim 1 is characterized in that the diameter at pore (3) is 5-8mm.
3. swiveling jetting device for removing hydrogen from aluminum melt according to claim 1 is characterized in that the width at radial groove (5) is 3-5mm.
4. swiveling jetting device for removing hydrogen from aluminum melt according to claim 1 is characterized in that 6 heel teeths of uniform distribution (4) on the circumference of gas tip (2).
5. swiveling jetting device for removing hydrogen from aluminum melt according to claim 1 is characterized in that gas tip (2) is by being threadedly connected to the lower end of airway (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100307790A CN101555555B (en) | 2009-04-15 | 2009-04-15 | Swiveling jetting device for removing hydrogen from aluminum melt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100307790A CN101555555B (en) | 2009-04-15 | 2009-04-15 | Swiveling jetting device for removing hydrogen from aluminum melt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101555555A true CN101555555A (en) | 2009-10-14 |
| CN101555555B CN101555555B (en) | 2011-01-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100307790A Active CN101555555B (en) | 2009-04-15 | 2009-04-15 | Swiveling jetting device for removing hydrogen from aluminum melt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101555555B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828041A (en) * | 2012-09-24 | 2012-12-19 | 哈尔滨工业大学 | Rotary pulse type aluminum alloy refining device |
-
2009
- 2009-04-15 CN CN2009100307790A patent/CN101555555B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828041A (en) * | 2012-09-24 | 2012-12-19 | 哈尔滨工业大学 | Rotary pulse type aluminum alloy refining device |
| CN102828041B (en) * | 2012-09-24 | 2013-12-25 | 哈尔滨工业大学 | Rotary pulse type aluminum alloy refining device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101555555B (en) | 2011-01-12 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 226000 Tongzhou District Province, Nantong City, the town of the town of the safety of the bridge in the village of the four group of Patentee after: Nantong Hongde Mechanical Co., Ltd. Patentee after: Southeast University Address before: Four Western Jiangsu province 226352 Tongzhou City Hing Road No. 98 Patentee before: Tongzhou Sian Nodular Casting Co., Ltd. Patentee before: Southeast University |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 226000 Tongzhou District Province, Nantong City, the town of the town of the safety of the bridge in the village of the four group of Co-patentee after: Southeast University Patentee after: Jiangsu macro special components Limited by Share Ltd Address before: 226000 Tongzhou District Province, Nantong City, the town of the town of the safety of the bridge in the village of the four group of Co-patentee before: Southeast University Patentee before: Nantong Hongde Mechanical Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder |