CN111842823B - Anti-blocking nozzle for continuous casting secondary cooling - Google Patents
Anti-blocking nozzle for continuous casting secondary cooling Download PDFInfo
- Publication number
- CN111842823B CN111842823B CN202010762856.8A CN202010762856A CN111842823B CN 111842823 B CN111842823 B CN 111842823B CN 202010762856 A CN202010762856 A CN 202010762856A CN 111842823 B CN111842823 B CN 111842823B
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- nozzle
- water
- negative pressure
- pressure ring
- hole
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 24
- 238000001816 cooling Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 87
- 238000009826 distribution Methods 0.000 claims abstract description 14
- 238000005507 spraying Methods 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 abstract description 22
- 239000007921 spray Substances 0.000 abstract description 16
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 238000000889 atomisation Methods 0.000 abstract description 8
- 239000002245 particle Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 9
- 239000012530 fluid Substances 0.000 description 8
- 238000005266 casting Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009692 water atomization Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
- B22D11/1246—Nozzles; Spray heads
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses an anti-blocking nozzle for continuous casting secondary cooling, which belongs to the technical field of continuous casting production and comprises a nozzle body with a spray hole, wherein a nozzle core is arranged in the nozzle body at the deviating end deviating from the spray hole, an air inlet channel is formed between the nozzle core and the nozzle body, an air inlet channel and a water distribution hole communicated with the air inlet channel are arranged in the nozzle core, and a negative pressure ring positioned at the upper edge of the water distribution hole part is arranged outside the nozzle core. After entering from the air inlet channel, the compressed air is blocked to flow back at the water diversion hole through the negative pressure ring so as to form negative pressure, and then cooling water in the water diversion hole is sucked out and scattered for atomization. The invention effectively solves the problem that the continuous casting particles block the nozzle.
Description
Technical Field
The invention belongs to the technical field of continuous casting production, and particularly relates to an anti-blocking nozzle for continuous casting secondary cooling.
Background
Continuous casting is an important ring in steel production, and the main process is that high-temperature molten steel is forced to cool in a crystallizer to form a blank shell with a certain thickness, and the interior of the blank shell is still liquid molten steel. And after the casting blank from the crystallizer enters the secondary cooling zone, continuously cooling and cooling under the forced cooling of a water nozzle or a steam-water atomizing nozzle until the molten steel in the casting blank is completely solidified. In the cooling process of the casting blank, about 15% of total heat is taken away by heat conduction between the casting blank and the support roller; the radiation heat transfer of the casting blank surface takes about 25 percent of total heat; the air-water jet cooling takes about 40% of the total heat; the cooling water heats up to take about 20% of the total heat, and it can be seen that the cooling water can take about 60% of the total heat in total by different means, so that the level of the heat transfer capacity of the cooling water has a decisive effect on the solidification of the cast strand and ultimately influences the quality of the cast strand.
The continuous casting nozzle is a key device for performing water spray cooling, and the problem of nozzle blockage is often found in field production, mainly because particles are stuck at the small-aperture parts of a nozzle water spray hole and the like, so that water cannot flow out. There are techniques in the prior art that improve upon nozzle clogging, such as: the patent number 200920119841 discloses a nozzle form, and the purpose of self-dredging the blocked nozzle is realized by changing the cooling water track after blocking through designing a special flow channel. The patent number 201620766925 discloses a nozzle form of 'high-efficiency anti-blocking nozzle', which realizes anti-blocking by changing the angles of water dividing holes and gas flow passages. The patent number 201921569541 discloses a nozzle form of "high-efficient self-filtering continuous casting cooling nozzle", through increasing two-stage filter equipment on gas runner and water runner, realizes the interception to the particulate matter, reaches the purpose of prevention nozzle jam. The patent number 201721563453 discloses a back flushing type anti-blocking air-water atomizing nozzle, which is in a nozzle form, and the automatic flushing function after the nozzle is blocked is realized by adding devices such as an air piston and the like. The patent number 201821506274 discloses a nozzle form of "a low-flow anti-blocking square nozzle for continuous casting", and the effect of pressure increase before the nozzle is realized by increasing the number of times that cooling water passes through the runner and improving the flow passage resistance loss, and then the small particle impurity is allowed to be sprayed out through the runner to avoid blocking the nozzle. The patent number 201821505501 'a small-flow anti-blocking long rod nozzle for continuous casting' discloses a nozzle form, wherein a stepped hole is arranged at the front end of a water spraying channel, and the angles of a water distribution hole and a gas flow channel are changed to realize anti-blocking.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an anti-clogging nozzle for continuous casting secondary cooling, which allows the diameter of a water spray hole to be increased by increasing a negative pressure ring to make compressed air suck cooling water, thereby eliminating the problem of clogging of the nozzle with particles.
The invention is realized by the following technical scheme:
The invention provides an anti-blocking nozzle for continuous casting secondary cooling, which comprises a nozzle body with a spray hole, wherein a nozzle core is arranged in the nozzle body and at the deviating end deviating from the spray hole, an air inlet channel is formed between the nozzle core and the nozzle body, a water inlet channel and a water distribution hole communicated with the water inlet channel and the air inlet channel are arranged in the nozzle core, and a negative pressure ring positioned at the upper edge of the opening of the water distribution hole is arranged outside the nozzle core. Therefore, the compressed air is blocked from flowing back at the water diversion hole position through the negative pressure ring after entering from the air inlet channel, so that negative pressure is formed, and cooling water in the water diversion hole is sucked out and scattered for atomization.
The difference from the existing continuous casting nozzle is that a newly added negative pressure ring blocks and disturbs the compressed air flowing through and forms a negative pressure area behind the compressed air, and the formed negative pressure area generates a suction effect on the cooling water flowing through the water diversion holes from the water spraying holes, accelerates the cooling water and then mixes the cooling water with the compressed air into the mixing chamber, and then sprays the cooling water through the spraying holes. According to the invention, through increasing the suction force of the compressed air generated after the negative pressure ring to the cooling water, the water inlet pressure in the water inlet channel can be reduced to ensure that the water flow is unchanged when the water spray hole is increased and the low water quantity is met, and the cooling water at the water distribution hole is pumped in an accelerating way and mixed with the compressed air by utilizing the suction force formed by the negative pressure ring.
Further, a mixing chamber is provided in the nozzle body between the nozzle core and the ejection hole.
Further, the nozzle core is connected with the nozzle body and the negative pressure ring by adopting threads or turnbuckles respectively. I.e. the tail part of the nozzle body is provided with internal threads and is connected with the nozzle core through threads.
Further, a step for positioning the negative pressure ring is arranged on the nozzle core. I.e. the nozzle core head is smaller in diameter than the nozzle core tail, so that the negative pressure ring can pass through the nozzle core head and be screwed to the nozzle core tail.
Further, the negative pressure ring is of an annular structure with bosses, the number of the bosses is equal to that of the water diversion holes, and the bosses and the water diversion holes are correspondingly arranged.
Further, the protruding length of the boss in the radial direction of the negative pressure ring is 2-5mm, the outer contour of the boss is provided with an arc concentric with the negative pressure ring, and the width of the boss in the circumferential direction of the negative pressure ring is the same as the width of the water diversion hole.
Further, the boss is set up to one or more, and a plurality of bosss are evenly encircled and spread on the negative pressure ring.
Further, the lower end face of the negative pressure ring is tangent with the upper edge of the water diversion hole. The upper edge of the opening part of the water diversion hole faces to one side of the tail part of the nozzle body.
Further, a water spraying hole which is communicated with the water distributing hole and the water inlet channel is arranged in the nozzle core, and the aperture of the water spraying hole is more than or equal to 2.5mm.
The invention has the advantages that:
1. The anti-blocking nozzle provided by the invention can be used for disturbing the compressed air and generating negative pressure in the water distribution holes to suck cooling water in the water distribution holes by adding the negative pressure ring, so that the purpose of increasing the water spraying holes to prevent the nozzle from being blocked under the condition of ensuring the water flow and the atomization effect to be unchanged is achieved.
2. The anti-blocking nozzle has the advantages of simple and reasonable structure, convenient control and operation, low cost and stable and reliable operation.
3. The anti-blocking nozzle is suitable for atomization of gas-water two-phase medium.
4. The anti-blocking nozzle separates the nozzle core from the nozzle body into two devices and is connected with the two devices through threads, so that the anti-blocking nozzle is convenient to process and manufacture.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings, in which:
FIG. 1 is a cross-sectional view of a nozzle of the present invention.
Fig. 2 is a view of the A-A plane of fig. 1.
FIG. 3 is a cross-sectional view of a nozzle core of the present invention.
FIG. 4 is a schematic view of a negative pressure ring according to the present invention.
Fig. 5 is a schematic diagram of the operation of the present invention.
Description of the drawings: the nozzle comprises a nozzle body 1, a nozzle core 2, a negative pressure ring 3, a water inlet channel 4, an air inlet channel 5, a mixing chamber 6, a mixing chamber 7, a spray hole 8, a cooling water flow track 9, a compressed air cold flow track 21, a nozzle core tail part 22, a nozzle core head part 23, a water spray hole 24, a water diversion hole 31 and a boss.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present embodiment, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., the direction or the positional relationship is based on the direction or the positional relationship shown in the drawings, it is merely for convenience of describing the present embodiment and simplifying the description, and it is not necessary to indicate or imply that the device or element to be referred to must have a specific direction, be constructed and operated in the specific direction, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present technical solution, and it is possible for those of ordinary skill in the art to understand the specific meaning of the terms according to the specific circumstances.
The invention has the advantages of solving the problem of nozzle blockage in continuous casting production, and meeting the better atomization effect when the water quantity is low. In continuous casting production, the blocking of the water spray holes and the nozzles is closely related, the blocking can be avoided by increasing the water spray holes, but the water pressure must be reduced in low water yield production, so that the speed of cooling water entering the water distribution holes from the water spray holes is reduced, and the atomization effect of water drops is poor, and the relationship is shown in table 1.
TABLE 1 influence matrix of conventional nozzle hole diameter and water pressure on production
The principle of the invention is as follows: after the fluid turbulence barrier, the pressure is increased, the speed is reduced, the fluid speed in the boundary layer is reduced to zero along with the increase of the fluid distance barrier distance, at a certain point, the fluid in the boundary layer in front of the point and the main flow are caused to flow reversely along with the continuous increase of the fluid distance barrier distance, the thickness of the boundary layer is increased, the flowing direction in the region is opposite to the main flow, a wake vortex region is formed after the barrier, the fluid pressure in the wake vortex region is low, and a pressure difference is formed between the fluid and surrounding fluid. The invention promotes the compressed air to form a tail vortex area at the water diversion hole and sucks the cooling water in the water diversion hole by arranging the negative pressure ring.
As shown in fig. 1-4, the anti-clogging nozzle for continuous casting production in this embodiment comprises a nozzle core 2, a nozzle body 1 and a negative pressure ring 3, wherein the nozzle core 2 is provided with a hollow water inlet channel 4, a nozzle core head 22 is provided with two water diversion holes 24, a nozzle core tail 21 is connected with the nozzle body 1 through threads and is provided with an air inlet channel 5 with the nozzle body 1, the negative pressure ring 3 which is connected to the nozzle core 2 through threads is arranged at the rear part of the water diversion holes, and the negative pressure ring 3 is provided with two bosses 31 and is just behind the two water diversion holes 24 after being installed. Therefore, the compressed air is blocked from flowing back at the two water diversion holes through the negative pressure ring after entering from the air inlet channel, so that negative pressure is formed, and cooling water in the water diversion holes is sucked out and scattered for atomization. Of course, in different embodiments, the number of the water diversion holes can be set according to the size of the nozzle core, and the number of the corresponding bosses is equal to that of the water diversion holes and is set in a one-to-one correspondence manner.
By adopting the scheme, the negative pressure ring penetrates through the nozzle core head and is tightly connected with the nozzle core head by adopting the screw thread, the boss of the negative pressure ring is just positioned right behind the water diversion hole, and then the nozzle core is connected with the nozzle body by the screw thread. During production, compressed air enters through an annular air inlet channel formed by the nozzle core and the nozzle body, flows through the negative pressure ring and enters the mixing chamber 6. Cooling water enters through a hollow water inlet channel at the tail part of the nozzle core, flows out from two water distribution holes after flowing through water spray holes, is accelerated to enter the mixing chamber 6 by suction force formed by compressed air in a negative pressure ring and is mixed with the compressed air, and the mixture of the mixing chamber and the compressed air is atomized and sprayed out through the spray holes. A cooling water flow path 8 and a compressed air cold flow path 9 as shown in fig. 5.
The nozzle body and the nozzle core in this embodiment can be made of stainless steel or brass.
The lower end face of the negative pressure ring 3 in this embodiment is tangential to the upper edge of the water diversion hole 24. The negative pressure effect of the negative pressure area below the boss is improved.
The aperture of the water spraying hole 23 in the embodiment is more than or equal to 2.5mm, when the low water amount is needed in the production process, the water pressure at the water inlet channel can be reduced, and the water inflow amount can be reduced.
In summary, the invention adds the negative pressure generating ring to turbulent the compressed air and generate negative pressure to suck the cooling water in the water distribution holes at the water distribution holes, thereby achieving the purpose of increasing the water spraying holes to prevent the nozzle from being blocked under the condition of ensuring the water flow and the atomization effect to be unchanged.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (6)
1. The anti-blocking nozzle for continuous casting secondary cooling comprises a nozzle body (1) with a spraying hole (7), and is characterized in that a nozzle core (2) is arranged in the nozzle body at the deviating end deviating from the spraying hole, an air inlet channel (5) is formed between the nozzle core and the nozzle body, an air inlet channel (4) and a water distribution hole (24) communicated with the air inlet channel and the air inlet channel are arranged in the nozzle core, and a negative pressure ring (3) positioned at the upper edge of the water distribution hole part is arranged outside the nozzle core;
a mixing chamber (6) is arranged in the nozzle body and positioned between the nozzle core and the ejection hole;
the nozzle core is connected with the nozzle body and the negative pressure ring by adopting threads or turnbuckles respectively;
The nozzle core is provided with a step for positioning the negative pressure ring.
2. The anti-clogging nozzle for continuous casting secondary cooling according to claim 1, wherein the negative pressure ring has an annular structure with bosses (31), the number of which is equivalent to the number of water diversion holes, and the two are arranged correspondingly.
3. The anti-clogging nozzle for continuous casting secondary cooling according to claim 2, wherein the projection length of the boss in the radial direction of the negative pressure ring is 2-5mm, the outer contour thereof has an arc concentric with the negative pressure ring, and the width thereof in the circumferential direction of the negative pressure ring is the same as the width of the water dividing hole.
4. The anti-clogging nozzle for continuous casting secondary cooling according to claim 2 or 3, wherein one or more bosses are provided, and a plurality of bosses are uniformly distributed on the negative pressure ring.
5. The anti-clogging nozzle for continuous casting secondary cooling as claimed in claim 1, wherein the lower end surface of the negative pressure ring is tangent to the upper edge of the water diversion hole.
6. The anti-clogging nozzle for continuous casting secondary cooling according to claim 1, wherein a water spraying hole (23) communicating the water dividing hole with the water inlet passage is provided in the nozzle core, and the aperture of the water spraying hole is 2.5mm or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010762856.8A CN111842823B (en) | 2020-07-31 | 2020-07-31 | Anti-blocking nozzle for continuous casting secondary cooling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010762856.8A CN111842823B (en) | 2020-07-31 | 2020-07-31 | Anti-blocking nozzle for continuous casting secondary cooling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111842823A CN111842823A (en) | 2020-10-30 |
| CN111842823B true CN111842823B (en) | 2024-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010762856.8A Active CN111842823B (en) | 2020-07-31 | 2020-07-31 | Anti-blocking nozzle for continuous casting secondary cooling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111842823B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004122214A (en) * | 2002-10-07 | 2004-04-22 | Shinagawa Refract Co Ltd | Upper nozzle for casting |
| CN101274357A (en) * | 2008-05-15 | 2008-10-01 | 天津钢管集团股份有限公司 | Nozzle for atomizing water with air suitable for round billet continuous casting secondary cooling |
| CN202962713U (en) * | 2012-11-30 | 2013-06-05 | 北京中冶冶金设备制造有限公司 | High turndown ratio anti-blocking nozzle |
| JP2016117094A (en) * | 2014-12-19 | 2016-06-30 | 白光株式会社 | Nozzle and manufacturing method of nozzle |
| CN108907127A (en) * | 2018-09-14 | 2018-11-30 | 江苏博际喷雾***股份有限公司 | A kind of small flow block-resistant type square nozzle of continuous casting |
| CN208758579U (en) * | 2018-09-14 | 2019-04-19 | 江苏博际喷雾***股份有限公司 | A kind of small flow block-resistant type long stem nozzle of continuous casting |
| CN212443151U (en) * | 2020-07-31 | 2021-02-02 | 中冶赛迪技术研究中心有限公司 | Continuous casting secondary cooling is with preventing blockking up nozzle |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030075297A1 (en) * | 2001-10-15 | 2003-04-24 | Kyeong-Mi Kim | Method and apparatus for spray casting of alloy ingots |
-
2020
- 2020-07-31 CN CN202010762856.8A patent/CN111842823B/en active Active
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|---|---|---|---|---|
| JP2004122214A (en) * | 2002-10-07 | 2004-04-22 | Shinagawa Refract Co Ltd | Upper nozzle for casting |
| CN101274357A (en) * | 2008-05-15 | 2008-10-01 | 天津钢管集团股份有限公司 | Nozzle for atomizing water with air suitable for round billet continuous casting secondary cooling |
| CN202962713U (en) * | 2012-11-30 | 2013-06-05 | 北京中冶冶金设备制造有限公司 | High turndown ratio anti-blocking nozzle |
| JP2016117094A (en) * | 2014-12-19 | 2016-06-30 | 白光株式会社 | Nozzle and manufacturing method of nozzle |
| CN108907127A (en) * | 2018-09-14 | 2018-11-30 | 江苏博际喷雾***股份有限公司 | A kind of small flow block-resistant type square nozzle of continuous casting |
| CN208758579U (en) * | 2018-09-14 | 2019-04-19 | 江苏博际喷雾***股份有限公司 | A kind of small flow block-resistant type long stem nozzle of continuous casting |
| CN212443151U (en) * | 2020-07-31 | 2021-02-02 | 中冶赛迪技术研究中心有限公司 | Continuous casting secondary cooling is with preventing blockking up nozzle |
Non-Patent Citations (3)
| Title |
|---|
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