Small-flow nozzle for slab continuous casting

Abstract

The utility model relates to a small-flow nozzle for slab continuous casting. Comprising a nozzle seat, a water spraying channel with an open front end and a closed rear end is arranged in the nozzle seat, a water spraying pipe is connected to the front end of the water spraying channel, a stepped hole is formed in the front end of the water spraying channel, an air spraying pipe is connected to the front portion of the stepped hole, the water spraying pipe is located in the air spraying pipe, and the axes of the water spraying pipe and the air spraying pipe coincide; a water inlet communicated with the water spraying channel is formed in the side wall of the rear portion of the nozzle seat, an air inlet communicated with the air spraying channel is formed in the side wall of the stepped hole, a water segregator is installed at the front end of the water spraying pipe, a spraying head is installed at the front end of the air spraying pipe, a mixer located in the air spraying pipe is arranged at the rear end of the spraying head, and a built-in water filter is arranged in the water inlet. A plurality of filtering holes are uniformly formed in the bottom of the built-in water filter, so that blockage is not easy to occur, air and water are fully mixed, spraying is uniform, and the cooling effect is good.

Description

Technical Field

[0001] This utility model relates to a nozzle, and more particularly to a low-flow nozzle for slab continuous casting. Background Technology

[0002] The continuous casting process is essentially a solidification heat transfer process where high-temperature molten steel transforms into a solid state. Therefore, the solidification heat transfer process of the billet has a crucial impact on the quality of the billet, including surface cracks, internal cracks, and bulging. Water is mostly used as the cooling medium in the solidification heat transfer process of the billet. In a sense, continuous casting technology is water-cooling technology, that is, a solidification heat transfer process in which high-temperature molten steel is solidified into a billet using cooling water. The water-cooling system consists of many nozzles arranged in a regular pattern around the billet. When some nozzles become clogged, the billet at the corresponding location cannot receive cooling and its temperature rises sharply, sometimes by hundreds of degrees Celsius. This uneven cooling creates thermal stress, ultimately causing cracks in the billet. Existing continuous casting nozzles are prone to clogging when using substandard water media, leading to insufficient air-water mixing, uneven spraying, high compressed air energy consumption, low water mist impact force, and poor cooling effect. Utility Model Content

[0003] To address the aforementioned shortcomings, the purpose of this invention is to provide a low-flow nozzle for slab continuous casting that is easy to manufacture, less prone to clogging, ensures thorough gas-water mixing, provides uniform spraying, and offers good cooling effect.

[0004] Therefore, the technical solution adopted by this utility model is:

[0005] A low-flow nozzle for slab continuous casting includes a nozzle seat, a water spray channel with an open front end and a closed rear end inside the nozzle seat, a water spray pipe connected to the front end of the water spray channel, a stepped hole at the front end of the water spray channel, an air jet pipe connected to the front of the stepped hole, the water spray pipe being located inside the air jet pipe with their axes coinciding, the annular space formed between the air jet pipe and the water spray pipe being the air jet channel, a water inlet connected to the water spray channel being provided on the rear side wall of the nozzle seat, an air inlet connected to the air jet channel being provided on the side wall of the stepped hole, a water distributor being installed at the front end of the water spray pipe, a nozzle being installed at the front end of the air jet pipe, a mixer located inside the air jet pipe being provided at the rear end of the nozzle head, and an internal water filter being provided inside the water inlet, the internal water filter having a barrel-shaped structure, and a plurality of filter holes being evenly distributed at the bottom of the internal water filter.

[0006] As a further improvement to the above technical solution, the filter hole is circular.

[0007] As a further improvement to the above technical solution, the inlet is provided with an inlet step hole, the built-in water filter is located in the inlet step hole, and the upper and lower ends of the built-in water filter are provided with locking caps. The locking cap located at the bottom of the built-in water filter abuts against the step of the inlet step hole, and the outer circumference of the locking cap is connected to the inner wall of the inlet step hole by a thread.

[0008] As a further improvement to the above technical solution, a pin hole is provided on the side wall of the nozzle seat, and a pin for locking the outer wall of the water spray pipe is provided in the pin hole.

[0009] As a further improvement to the above technical solution, the mixer includes a mixer body, a mixing chamber at the front end of the mixer body, a central through hole communicating with the mixing chamber at the rear end of the mixer body, a first conical hole at the front end of the central through hole, a second conical hole at the rear end of the central through hole, the first conical hole communicating with the mixing chamber, the outer wall of the front end of the mixer body being threaded to the inner wall of the nozzle, and the diameter of the central through hole being smaller than the aperture of the filter hole.

[0010] As a further improvement to the above technical solution, the water distributor includes a water distributor body, with an inlet hole at the center of the water distributor body, and a number of water distribution holes connected to the inlet hole evenly distributed around the water distributor body.

[0011] The advantages of this utility model are:

[0012] This invention features a simple structure and is easy to manufacture. Pressurized water passes through a built-in water filter with circular pores, effectively intercepting large particles and elongated impurities to prevent clogging. The filtered pressurized water enters the spray channel, while compressed air enters the jet channel. The pressurized water then enters the distributor from the spray pipe, where it is sprayed in all directions for initial atomization. It is then fully mixed with compressed air entering through the jet pipe along the axis for secondary atomization. The pressurized air-water mixture enters the mixing chamber of the mixer for further thorough mixing, increasing the spray impact force and thus improving uniform cooling efficiency. This design also extends the nozzle's online service life, reduces on-site maintenance time, and improves work efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the built-in water filter.

[0015] Figure 3 This is a schematic diagram of the locking cap structure.

[0016] Figure 4This is a schematic diagram of the water distributor.

[0017] Figure 5 This is a schematic diagram of the mixer.

[0018] In the diagram, 1 is the nozzle seat, 2 is the water spray channel, 3 is the water spray pipe, 4 is the air spray pipe, 5 is the air spray channel, 6 is the water inlet, 7 is the air inlet, 8 is the water distributor, 9 is the nozzle, 10 is the mixer, 11 is the built-in water filter, 12 is the filter hole, 13 is the locking cap, 14 is the pin, 15 is the mixer body, 16 is the mixing chamber, 17 is the central through hole, 18 is the first conical hole, 19 is the second conical hole, 20 is the water distributor body, 21 is the water inlet, and 22 is the water distribution hole. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] A low-flow nozzle for slab continuous casting includes a nozzle seat 1. The nozzle seat 1 has a water spray channel 2 with an open front end and a closed rear end. A water spray pipe 3 is connected to the front end of the water spray channel 2. A stepped hole is provided at the front end of the water spray channel 2, and an air jet pipe 4 is connected to the front of the stepped hole. The water spray pipe 3 is located inside the air jet pipe 4, and their axes coincide. The annular space formed between the air jet pipe 4 and the water spray pipe 3 is an air jet channel 5. A water inlet 6 communicating with the water spray channel 2 is provided on the rear side wall of the nozzle seat 1. An air inlet 7 communicating with the air jet channel 5 is provided on the side wall of the stepped hole. A water distributor 8 is installed at the front end of the water spray pipe 3. A nozzle 9 is installed at the front end of the air jet pipe 4. A mixer 10 located inside the air jet pipe 4 is provided at the rear end of the nozzle 9. An internal water filter 11 is provided inside the water inlet 6. The internal water filter 11 has a barrel-shaped structure, and several filter holes 12 are evenly distributed at the bottom of the internal water filter 11.

[0021] As a further improvement to the above technical solution, the filter hole 12 is circular.

[0022] As a further improvement to the above technical solution, the inlet 6 is provided with an inlet step hole, and the built-in water filter 11 is located in the inlet step hole. Both the upper and lower ends of the built-in water filter 11 are provided with locking caps 13. The locking cap 13 located at the bottom of the built-in water filter 11 abuts against the step of the inlet step hole. The outer circumference of the locking cap 13 is connected to the inner wall of the inlet step hole by a thread to prevent the built-in water filter 11 from loosening. The upper end face of the locking cap 13 is provided with an internal hexagonal hole, which makes it convenient and quick to replace and clean the built-in water filter 11.

[0023] As a further improvement to the above technical solution, a pin hole is provided on the side wall of the nozzle seat 1, and a pin 14 for locking the outer wall of the water spray pipe 3 is provided in the pin hole.

[0024] As a further improvement to the above technical solution, the mixer 10 includes a mixer body 15. The front end of the mixer body 15 is provided with a mixing chamber 16, and the rear end of the mixer body 15 is provided with a central through hole 17 that communicates with the mixing chamber 16. The front end of the central through hole 17 is provided with a first conical hole 18, and the rear end of the central through hole 17 is provided with a second conical hole 19. The first conical hole 17 communicates with the mixing chamber 16. The outer wall of the front end of the mixer body 15 is connected to the inner wall of the nozzle 9 by a thread, so that the air and water are fully mixed again in the mixing chamber 16. The diameter of the central through hole 17 is smaller than the aperture of the filter hole 12. The filter hole 12 can intercept large particles and strip-shaped impurities, ensuring the unobstructed flow of the central through hole 17.

[0025] As a further improvement to the above technical solution, the water distributor 8 includes a water distributor body 20, with an inlet hole 21 at the center of the water distributor body 20, and a number of water distribution holes 22 connected to the inlet hole 21 evenly distributed around the water distributor body 20, so that the pressurized water medium is sprayed in all directions and atomized once.

[0026] Working principle:

[0027] Pressurized water passes through a built-in water filter with round pores that effectively intercept large particles and elongated impurities, preventing blockages. The filtered pressurized water enters the spray channel, while compressed air enters the jet channel. The pressurized water then flows from the spray pipe into the distributor for initial atomization. It is then fully mixed with compressed air entering through the jet pipe along the axis for secondary atomization. The pressurized air-water mixture enters the mixing chamber of the mixer for further thorough mixing, increasing the spray impact force and thus improving uniform cooling efficiency. This extends the nozzle's online service life, reduces on-site maintenance time, and increases work efficiency.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-flow nozzle for slab continuous casting, comprising a nozzle seat, a water spray channel with an open front end and a closed rear end within the nozzle seat, a water spray pipe connected to the front end of the water spray channel, a stepped hole at the front end of the water spray channel, an air jet pipe connected to the front part of the stepped hole, the water spray pipe being located inside the air jet pipe with their axes coinciding, an annular space formed between the air jet pipe and the water spray pipe constituting the air jet channel, a water inlet communicating with the water spray channel on the rear side wall of the nozzle seat, an air inlet communicating with the air jet channel on the side wall of the stepped hole, a water distributor installed at the front end of the water spray pipe, a nozzle head installed at the front end of the air jet pipe, and a mixer located inside the air jet pipe at the rear end of the nozzle head, characterized in that... The inlet is equipped with a built-in water filter, which has a barrel-shaped structure and a number of filter holes are evenly distributed at the bottom.

2. The low-flow nozzle for slab continuous casting according to claim 1, characterized in that, The filter hole is round.

3. The low-flow nozzle for slab continuous casting according to claim 1, characterized in that, The inlet has an inlet step hole inside, and the built-in water filter is located inside the inlet step hole. Both the upper and lower ends of the built-in water filter are provided with locking caps. The locking cap located at the bottom of the built-in water filter abuts against the step of the inlet step hole. The outer circumference of the locking cap is connected to the inner wall of the inlet step hole by a thread.

4. A low-flow nozzle for slab continuous casting according to claim 1, characterized in that, A pin hole is provided on the side wall of the nozzle seat, and a pin is provided in the pin hole to lock the outer wall of the water spray pipe.

5. A low-flow nozzle for slab continuous casting according to claim 1, characterized in that, The mixer includes a mixer body, a mixing chamber at the front end of the mixer body, a central through hole at the rear end of the mixer body that communicates with the mixing chamber, a first conical hole at the front end of the central through hole, a second conical hole at the rear end of the central through hole, the first conical hole communicating with the mixing chamber, the outer wall of the front end of the mixer body being threaded to the inner wall of the nozzle, and the diameter of the central through hole being smaller than the aperture of the filter hole.

6. A low-flow nozzle for slab continuous casting according to claim 1, characterized in that, The water distributor includes a water distributor body, with an inlet hole at the center of the water distributor body and several water distribution holes evenly distributed around the water distributor body, which are connected to the inlet hole.

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