CN204912746U - Immersion nozzle for crystallizer - Google Patents
Immersion nozzle for crystallizer Download PDFInfo
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- CN204912746U CN204912746U CN201520643428.8U CN201520643428U CN204912746U CN 204912746 U CN204912746 U CN 204912746U CN 201520643428 U CN201520643428 U CN 201520643428U CN 204912746 U CN204912746 U CN 204912746U
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- crystallizer
- molten steel
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- pressure chamber
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Abstract
The utility model provides a symmetry is equipped with wedge negative pressure chamber on the pipe wall of both sides, is equipped with bypass outlet at wedge negative pressure chamber lower extreme, and wedge negative pressure chamber upper portion is inflow entrance last time that immersion nozzle for crystallizer leads stream block by the molten steel that the molten steel enters the mouth, the body lower extreme was equipped with export, the molten steel outflow of body, body upper end and constitutes, and it is 30-40mm department below the minimum liquid level line of setting for in the body. The utility model discloses at the continuous casting in -process, do not receive crystallizer width variation's influence, the homoenergetic forms stable two backward flows, reaches and stabilizes the flow field effect.
Description
Technical field
The utility model relates to a kind of steel-making equipment, specifically belongs to a kind of submersed nozzle for crystallizer.
Background technology
Sheet blank continuous casting process adopts " ox muzzle " submersed nozzle of pancake diplopore or quadrifora.Molten steel flows into crystallizer by the mouth of a river; submersed nozzle pass and structure directly decide crystallizer Flow Field Distribution; rational crystallizer flow field can make field trash and bubble floating in molten steel; prevent slag; covering slag is impelled to melt good; otherwise erratic crystallizer Flow Field Distribution then causes quality and the production accidents such as slag, crackle, bleedout.
There are single backflow, dual reflux two kinds of main fluidised forms in crystallizer flow field, and its flow location form depends mainly on the flow velocity of water-gap outlets stream stock, exit angle and dissipation distance in a crystallizer.During continuous casting is produced, submersed nozzle design is fixed, and crystallizer flow location form now depends primarily on exit velocity and the stream stock dissipation distance in a crystallizer of molten steel, namely depends on pulling speed of continuous casting and crystallizer section.Research finds when crystallizer section is less than 1300mm, high velocity stream stock impacts after mould at narrow, define kinetic energy enough to upper reaches and one to dirty, crystallizer defines liquid level stream stock to upper reaches, the backward lower remittance outlet flow in the collision mouth of a river, defines backflow.And to dirty stock, then, under the downward traction of pulling rate piston flow, form lower backflow, finally, form size four eddy flow form flow fields in length and breadth, the one-sided flow field of crystallizer presents dual reflux form.
When crystallizer width is greater than 1300mm, water-gap outlets stream stock dissipatinga attenuation distance increases, before the narrow limit of impact, just decelerate to reduced levels, what formed is very faint to upper reaches stock, and upper backflow is not obvious, and to dirty stock, then under the downward traction of pulling rate piston flow, form single backflow.
The problem in the crystallizer flow field that the conventional mouth of a river is brought is as follows:
(1) during crystallizer width≤1300mm, last time, lumen showed, and stream stock arrives after mold liquid level, flows along liquid level to the mouth of a river, after clashing into, then entered outlet flow stock downwards and formed circulation with the mouth of a river.Multiple impact, must cause liquid fluctuating to strengthen, and the mechanical erosion at the mouth of a river, finally causes slag entrapment in mold, affects slab quality;
(2) as crystallizer width >=1300mm, crystallizer flow field is single lower backflow form, and mold liquid level shortage newly enters supplementing of molten steel, causes surperficial molten steel temperature low, and covering slag fusing difficulty, brings the mass defects such as strand crackle.
The utility model, for the problems referred to above, devises a kind of novel sheet bar submersed nozzle.This mouth of a river devises a negative pressure chamber in the inner side of submersed nozzle, and there is opening negative pressure chamber upper end, and aperture position is 30-40mm below the minimum work mold liquid level of submersed nozzle, and lower end is parallel with crystallizer Way out.Under the effect of outlet steel stream, around submersed nozzle, produce negative pressure, under negative pressure drives, the molten steel of mold liquid level slowly and stably can enter negative pressure chamber, and converges with outlet main flow, thus adds Wide Band Oxygen Sensors crystallizer, reversing of surface molten steel, defines stable upper backflow.For narrow section crystallizer, then avoid the collision at surface stream stock and the mouth of a river, decrease the risk of slag entrapment in mold.Thus in casting process, no matter how crystallizer width changes, and all can form stable dual reflux, reach the effect of steady flow condition.
Utility model content
The utility model exists for existing common Submersed nozzle of sheet billet technology: when casting different section crystallizer; occur that level fluctuation is large; or the deficiency that being difficult to of the low covering slag of surface temperature is saturating; there is provided a kind of in casting process; not by the impact of crystallizer change width; equal energy forms stable dual reflux, reaches the submersed nozzle for crystallizer of steady flow condition effect.
Realize the technical measures of above-mentioned purpose:
A kind of submersed nozzle for crystallizer, the molten steel be provided with by the molten steel entrance of body, body upper end, body lower end exports, molten steel flows out baffle and forms, it is: the both sides tube wall at 30 ~ 40mm place below the minimum liquid level line set in body is arranged with wedge shape negative pressure chamber, be provided with bypass outlet in wedge shape negative pressure chamber lower end, wedge shape negative pressure chamber top is upper reflux inlet.
It is: the lower end of wedge shape negative pressure chamber is at 5 ~ 10mm place of molten steel outlet height.
The both sides tube wall at 30 ~ 40mm place below the minimum liquid level line that the utility model sets in body is arranged with wedge shape negative pressure chamber, bypass outlet is provided with in wedge shape negative pressure chamber lower end, the promising upper reflux inlet in wedge shape negative pressure chamber top, its effect can make crystallizer to reflux molten steel under suction function, converges to outlet; Transmission negative pressure plays in negative pressure chamber, and the molten steel aspirated near liquid level and outlet flow are converged; Negative pressure chamber's outlet is then convergence place of upper backflow molten steel and outlet flow stock.
The utility model is exactly the negative pressure utilizing exit; the passage that a crystallizer top molten steel is connected with exit is set up in the position that steel flow export negative pressure is maximum; negative pressure is utilized to drive molten steel to flow to outlet from upper surface; form a stable upper backflow in crystallizer liquid steel level, crystallizer side, side, the mouth of a river and outlet flow region simultaneously; on this, backflow is not limiting by crystallizer width; be conducive to the flowing promoting mold liquid level molten steel, ensure the fusing of crystallizer protecting residue.Meanwhile, the collision of surface stream stock and submersed nozzle can be avoided, decrease the risk of slag entrapment in mold, reach the effect in stable crystalline device flow field.
Feature of the present utility model:
(1) add the flowing of Wide Band Oxygen Sensors crystallizer (>=1300mm) surperficial molten steel, define stable upper backflow, be conducive to the flowing promoting mold liquid level molten steel, ensure the fusing of crystallizer protecting residue;
(2) for narrow section crystallizer (≤1300mm), avoid the collision at surface stream stock and the mouth of a river, reduce the risk of slag entrapment in mold;
(3), in casting process, no matter how crystallizer width changes, and all can form stable dual reflux, reach the effect of steady flow condition.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is that a left side of Fig. 1 is looked or right view;
Fig. 3 is the utility model backflow cloth flowing water mouth fundamental diagram;
In figure: 1-body, 2-molten steel entrance, 3-molten steel exports, and 4-molten steel flows out baffle, 5-wedge shape negative pressure chamber, 6-upper bypass outlet, 7-upper reflux inlet.
Detailed description of the invention
Be described further below in conjunction with accompanying drawing:
A kind of submersed nozzle for crystallizer, the molten steel be provided with by the molten steel entrance 2 of body 1, body 1 upper end, body 1 lower end exports 3, molten steel flows out baffle 4 and forms, symmetrical overall processing or welding wedge shape negative pressure chamber 5 on any both sides tube wall everywhere of 30 ~ 40mm scope below its minimum liquid level line set in body 1, be processed with bypass outlet 6 in wedge shape negative pressure chamber 5 lower end, and make the lower end of wedge shape negative pressure chamber 5 be located at 5 ~ 10mm scope any place of molten steel outlet 3 height; Wedge shape negative pressure chamber 5 top is provided with reflux inlet 7.
Principle
The utility model utilizes the negative pressure at upper bypass outlet 6 place; set up a crystallizer top molten steel and molten steel in the position that upper bypass outlet 6 negative pressure is maximum and export the passage that 3 places are connected; negative pressure is utilized to drive molten steel to flow to molten steel outlet 3 from upper surface; simultaneously export 3 regions at crystallizer liquid steel level, crystallizer side, side, the mouth of a river and molten steel and form a stable upper backflow; on this, backflow no longer limits by crystallizer width; be conducive to the flowing promoting mold liquid level molten steel, ensure the fusing of crystallizer protecting residue.
This detailed description of the invention is only the best and exemplifies, the restricted enforcement not to technical solutions of the utility model.
Claims (2)
1. a submersed nozzle for crystallizer, the molten steel be provided with by the molten steel entrance of body, body upper end, body lower end exports, molten steel flows out baffle and forms, it is characterized in that: the both sides tube wall at 30 ~ 40mm place below the minimum liquid level line set in body is arranged with wedge shape negative pressure chamber, be provided with bypass outlet in wedge shape negative pressure chamber lower end, wedge shape negative pressure chamber top is upper reflux inlet.
2. a kind of submersed nozzle for crystallizer as claimed in claim 1, is characterized in that: the lower end of wedge shape negative pressure chamber is at 5 ~ 10mm place of molten steel outlet height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520643428.8U CN204912746U (en) | 2015-08-25 | 2015-08-25 | Immersion nozzle for crystallizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520643428.8U CN204912746U (en) | 2015-08-25 | 2015-08-25 | Immersion nozzle for crystallizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204912746U true CN204912746U (en) | 2015-12-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520643428.8U Active CN204912746U (en) | 2015-08-25 | 2015-08-25 | Immersion nozzle for crystallizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204912746U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111872338A (en) * | 2020-07-10 | 2020-11-03 | 上海大学 | Method for judging flow field form of slab crystallizer |
-
2015
- 2015-08-25 CN CN201520643428.8U patent/CN204912746U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111872338A (en) * | 2020-07-10 | 2020-11-03 | 上海大学 | Method for judging flow field form of slab crystallizer |
| CN111872338B (en) * | 2020-07-10 | 2021-11-05 | 上海大学 | Method for judging flow field form of slab crystallizer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170713 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |
|
| TR01 | Transfer of patent right |