Double-atomization-runner composite medium switching nozzle for continuous casting machine

Abstract

The invention provides a double-atomization-flow-channel composite medium switching nozzle for a continuous casting machine, and the nozzle comprises a nozzle body which is internally provided with a first cavity and a second cavity; the inlet end of the first cavity is communicated with an external water pipe, and the outlet end is communicated with the second cavity through a connecting channel; the inlet end of the second cavity is communicated with an external air pipe; the double-channel assembly is arranged at the outlet end of the second cavity and comprises a first channel and a second channel, and the second channel is distributed on the peripheral side of the first channel and used for allowing a water-gas mixture to pass through; water passes through the first channel; the switching assembly is arranged in the second cavity and comprises a first state and a second state; when the air pipe is blocked, the switching assembly is in a first state, so that the connecting channel is communicated with the first channel; and when the gas pipe is conducted, the switching assembly is in a second state, so that the gas and the water are mixed after passing through the switching assembly and enter the second channel. The nozzle provided by the invention has the advantages that the dual modes can be quickly switched, the atomization angle is consistent, and the nozzle is adaptive to all steel types.

Description

Technical Field

[0001] This invention belongs to the technical field of billet spray cooling equipment, specifically relating to a dual-atomization flow channel composite medium switching nozzle for continuous casting machines. Background Technology

[0002] In continuous casting, the secondary cooling process needs to be matched with different cooling intensities and atomization forms according to the characteristics of the steel being cast (such as plain carbon steel or crack-sensitive alloy steel). Typically, high-capacity all-water nozzles or gentle atomizing air-mist nozzles are used to correspond to strong and weak cooling processes, respectively. With the current trend towards intensive and efficient steel production, a single continuous casting machine needs to have the production capacity to cover all steel grades. Therefore, its secondary cooling nozzles must be able to flexibly adapt within a wide cooling range, a requirement that traditional fixed nozzles with a single medium cannot meet.

[0003] While some existing nozzle designs attempt to accommodate both cooling modes, they mostly employ a single, shared atomizing channel. When switching between pure water and air-water modes, the inherent differences in medium characteristics and channel structure lead to significant changes in the spray atomization angle. This inconsistency directly affects the uniformity of surface cooling and process stability of the cast billet, making it impossible to maintain a constant atomization coverage while ensuring rapid switching between cooling modes. This limits its reliable application in continuous casting production of all steel grades. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, a dual-atomization flow channel composite medium switching nozzle for a continuous casting machine is provided, comprising: The nozzle body has a first cavity and a second cavity formed therein; the inlet end of the first cavity is used to connect to an external water pipe and is provided with a water filtration assembly, and the outlet end is connected to the second cavity through a connecting channel; the inlet end of the second cavity is used to connect to an external air pipe and is provided with an air filtration assembly. A dual-channel assembly is disposed at the outlet end of the second cavity and includes a nozzle, a first channel, and a second channel. The second channel is distributed on the outer periphery of the first channel and is used to pass a water-air mixture; the first channel is used to pass water. A switching component is disposed within the second cavity and includes a first state and a second state; when the trachea is blocked, the switching component is placed in the first state to connect the connecting channel with the first channel; when the trachea is open, the switching component is placed in the second state to allow gas and water to mix after passing through the switching component and enter the second channel.

[0005] According to the technical solution provided by the present invention, the water filtration assembly includes: The water external grille is detachably installed at the inlet end of the first cavity and has a cylindrical structure, so that water is filtered when it passes through its outer wall; An internal water screen is detachably installed in the first cavity and is hollow inside, communicating with the interior of the external water screen. The side wall of the internal water screen is provided with multiple filter holes. A composite bar is detachably installed in the first cavity and sleeved outside the underwater bar to separate the underwater bar from the connecting channel.

[0006] According to the technical solution provided by the present invention, the air filtration assembly includes: An internal air filter, which is detachably installed at the inlet end of the second cavity and has a cylindrical structure, is used to filter the gas as it passes through its outer wall. An external air grille, which is a cylindrical structure and coaxially sleeved outside the internal air grille, and is detachably connected to the inlet end of the second cavity.

[0007] According to the technical solution provided by the present invention, the dual-channel component includes: The nozzle head body is detachably connected to the outlet end of the second cavity, and includes a coaxial inner shell and an outer shell. The inner shell is hollow to form the first channel, and a plurality of second channels are formed between the inner shell and the outer shell. The plurality of second channels are evenly distributed along the circumference of the nozzle head body. A nozzle cap is detachably connected to the outer shell of the nozzle head body, and the end of the nozzle cap away from the second cavity cooperates with the nozzle head body to form the nozzle orifice.

[0008] According to the technical solution provided by the present invention, a nozzle core is installed inside the nozzle head body, and a pair of swirling grooves are provided on the side wall of the nozzle core, and a gathering groove communicating with the swirling grooves is provided on the side away from the second cavity.

[0009] According to the technical solution provided by the present invention, the outlet end of the nozzle cap is bent towards the side close to the axis of the nozzle head body to form an inward fold. The inward fold forms an arc-shaped oscillating surface on the side close to the second channel, and a guide cone is formed on the side away from the second channel. The diameter of the guide cone at one end close to the second cavity is smaller than the diameter at the other end. The outer wall of the outlet end of the nozzle head body is provided with a concave turning part. The turning part is used for the water-air mixture to turn between the end of the oscillating surface and the beginning of the guide cone.

[0010] According to the technical solution provided by the present invention, the switching component includes: A nozzle head plug is installed at the inlet end of the nozzle head body and connects the second channel and the second cavity; The diverter is a hollow cylindrical structure with one end connected to the nozzle head plug and the other end connected to the air filter assembly. A first water inlet is provided on the side wall of the diverter, which is connected to the connecting channel. The side wall of the diverter also has a pair of first water outlets and air outlets, located on the side of the first water inlet away from the nozzle head plug, and the air outlet on the side of the first water outlet away from the first water inlet. The outer side wall of the diverter has concave air guide grooves and water guide grooves corresponding to the first water outlets and air outlets. One end of the air guide groove is connected to the air outlet, and one end of the water guide groove is connected to the first water outlet. The other ends of the air guide groove and water guide groove are connected to the end of the diverter near the dual-channel assembly and connected to the second channel. A diverter pin is movably installed inside the diverter and is hollow inside, with its movement direction along the axial direction of the diverter. The side wall of the diverter pin is provided with a second water inlet and a second water outlet, with the second water inlet located on the side of the second water outlet near the nozzle head plug. When the air pipe is open, the diverter pin blocks the nozzle head plug, and the first water inlet is connected to the second water inlet. When the air pipe is blocked, the diverter pin opens the nozzle head plug, so that the first water inlet is connected to the nozzle head plug.

[0011] According to the technical solution provided by the present invention, the inner wall of the diverter is provided with an annular limiting protrusion, and the end of the diverter pin near the gas filter assembly is provided with a limiting part; an elastic reset member is sleeved on the outer side of the diverter pin, one end of the elastic reset member is in contact with the limiting part, and the other end is in contact with the limiting protrusion.

[0012] According to the technical solution provided by the present invention, the outer periphery of the limiting part is provided with an annular first concave portion, and the first concave portion is embedded with a first sealing ring; the inner wall of the diverter is formed with an annular second concave portion, the second concave portion is located on the side of the limiting protrusion away from the elastic limiting member, and is embedded with a second sealing ring.

[0013] According to the technical solution provided by the present invention, a guide slope is formed on the outer side wall of the inner shell of the nozzle head away from the second cavity, and the guide slope is used to guide the gas-liquid mixture to the oscillating surface.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: By integrating the first chamber and the second chamber with independent filtration functions into the nozzle body, and setting a dual-channel component including an independent first channel and a circumferentially distributed second channel, and cooperating with a switching component that can automatically switch states according to the air path opening and closing, the same nozzle can achieve rapid and stable switching between two process modes: pure water strong cooling and air mist weak cooling. Moreover, the media sprayed through different flow channels in both modes can maintain the same atomization angle and distribution characteristics. Thus, without replacing the nozzle or modifying the pipeline network, a continuous casting machine can flexibly adapt to the production needs of all steel grades, including high-speed carbon steel strong cooling and low-speed alloy steel weak cooling. This not only solves the limitation of the narrow cooling range of traditional single-type nozzles, but also significantly reduces compressed air consumption by closing the air path in pure water mode, while avoiding downtime caused by online nozzle replacement. Overall, it achieves comprehensive benefits of energy saving and consumption reduction, improved operating rate, guaranteed billet quality, and reduced maintenance intensity. Attached Figure Description

[0015] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a dual-atomization flow channel composite medium switching nozzle for a continuous casting machine provided in an embodiment of this application; Figure 2 A schematic diagram of the surface structure of the splitter after it has been unfolded. Figure 3 This is a schematic diagram of the distribution and sales structure; Figure 4 This is a schematic diagram of the nozzle head body. Figure 5 This is a schematic diagram of the nozzle cap structure; Figure 6 This is a schematic diagram of the nozzle core structure; Figure 7 for Figure 6 A schematic diagram of the top surface structure of the nozzle core shown. Figure 8 for Figure 1 The diagram shows the state of the nozzle in pure water mode. Figure 9 for Figure 1 The diagram shows the state of the nozzle in air-water mode.

[0016] The text labels in the diagram represent: 1. Nozzle body; 2. First cavity; 3. Second cavity; 4. Connecting channel; 5. First channel; 6. Second channel; 7. External water screen; 8. Internal water screen; 9. Composite screen; 10. Internal air screen; 11. External air screen; 12. Nozzle head body; 13. Inner shell; 14. Outer shell; 15. Nozzle head cap; 16. Nozzle core; 17. Swirl channel; 18. Converging channel; 19. Inner fold; 20. 21. Oscillating surface; 22. Guide cone surface; 23. Nozzle head plug; 24. Diverter; 25. First water inlet; 26. First water outlet; 27. Air outlet; 28. Air guide groove; 29. ​​Water guide groove; 30. Diverter pin; 31. Second water inlet; 32. Second water outlet; 33. Limiting protrusion; 34. Limiting part; 35. Elastic reset part; 36. First sealing ring; 37. Second sealing ring; 38. Guide slope; 39. Turning part. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] As mentioned in the background section, there are technical issues such as... Figures 1-9 As shown, this embodiment proposes a dual-atomization flow channel composite medium switching nozzle for a continuous casting machine, comprising: The nozzle body 1 has a first cavity 2 and a second cavity 3 formed inside it; the inlet end of the first cavity 2 is used to connect to an external water pipe and is provided with a water filter assembly, and the outlet end is connected to the second cavity 3 through a connecting channel 4; the inlet end of the second cavity 3 is used to connect to an external air pipe and is provided with an air filter assembly. A dual-channel assembly is disposed at the outlet end of the second cavity 3 and includes a nozzle, a first channel 5, and a second channel 6. The second channel 6 is distributed on the outer periphery of the first channel 5 and is used to pass a water-air mixture; the first channel 5 is used to pass water. A switching component is disposed within the second cavity 3 and includes a first state and a second state. When the trachea is blocked, the switching component is placed in the first state to connect the connecting channel 4 with the first channel 5. When the trachea is open, the switching component is placed in the second state to allow gas and water to mix after passing through the switching component and enter the second channel 6.

[0020] Specifically, such as Figure 1 As shown, the nozzle body 1 is a one-piece molded structure. Its interior is divided into a first chamber 2 and a second chamber 3, which are independent yet work together. This integrated design makes the overall nozzle structure compact, eliminating the need for additional piping, valves, or instruments. It can directly replace existing all-water nozzles or air-water atomizing nozzles, reducing equipment modification costs. The inlet end of the first chamber 2 is used for a sealed connection to an external water pipe to provide cooling water for the nozzle; the inlet end of the second chamber 3 is used for a sealed connection to an external air pipe to provide compressed air for the air-water atomization mode.

[0021] The inlet of the first chamber 2 is equipped with a water filtration assembly, and the inlet of the second chamber 3 is equipped with an air filtration assembly. These two types of filtration assemblies purify the water and compressed air entering the nozzle, respectively, effectively intercepting impurities in the medium and preventing impurities from accumulating in the chambers and causing nozzle blockage. This significantly improves the online availability of the nozzles and reduces maintenance frequency. The outlet of the first chamber 2 is connected to the second chamber 3 via a pre-designed connection channel 4, which provides a path for the water medium to flow from the first chamber 2 to the second chamber 3.

[0022] The dual-channel assembly is fixedly installed at the outlet end of the second cavity 3. Its core includes a nozzle and a first channel 5 and a second channel 6 arranged coaxially. The second channel 6 is distributed around the outer periphery of the first channel 5, forming an "inner-outer" dual-path delivery structure. Specifically, the first channel 5 is a dedicated channel for pure water delivery, which is only open in the full water cooling mode and is used to deliver high-pressure cooling water to achieve a strong cooling effect. The second channel 6 is a dedicated channel for water-air mixture delivery, which is only open in the air-water atomization mode and is used to deliver a uniformly mixed air-water medium to achieve a weak cooling effect. The independent design of the dual channels structurally avoids mutual interference when different media are delivered, and provides a structural basis for the consistency of the atomization angle in the two modes.

[0023] The switching component is built into the second chamber 3, and its operation is entirely adaptively controlled by the on / off state of the external trachea, requiring no manual intervention and improving ease of operation. The specific working process is as follows: When a full-water forced cooling mode is required (suitable for high-speed casting of carbon steel and other steel grades requiring forced cooling), the external air supply valve is closed, blocking the air supply. At this time, the switching assembly automatically switches to the first state. In this state, the internal channel of the switching assembly connects channel 4 and the first channel 5. Cooling water purified by the water filtration assembly flows out of the first chamber 2, enters the switching assembly through channel 4, is guided by the switching assembly to the first channel 5, and finally sprays out at a stable angle through the nozzle, achieving forced cooling of the casting billet (corresponding to...). Figure 8 The pure water mode status is shown.

[0024] When a gentle cooling mode using air-water atomization is required (suitable for low-speed alloy steel, crack-sensitive steels, and other steels requiring gentle cooling), the supply valve of the external air pipe is opened, placing the air pipe in a conductive state. At this time, the switching assembly automatically switches to the second state. In this state, the internal channels of the switching assembly are adjusted to ensure that the compressed air (purified by the air filter assembly) entering from the second chamber 3 and the cooling water entering from the connecting channel 4 are fully mixed inside the switching assembly, forming a uniform water-air mixture. This mixture is then guided to the second channel 6 and sprayed out through the nozzle at the same atomization angle as in the full-water mode, achieving gentle cooling of the casting billet (corresponding to...). Figure 9 (The gas-water mode status is shown).

[0025] Through the independent media delivery design of the first chamber 2 and the second chamber 3, the dedicated flow channel allocation of the dual-channel components, and the adaptive state switching of the switching components, the same nozzle can quickly switch between two cooling modes: full water and air-water atomization, without disassembly or modification. This solves the problems of narrow cooling range of traditional single nozzles and the need for multiple continuous casting machines to adapt to different steel grades. At the same time, the atomization angle of the nozzle remains consistent in both modes, ensuring the uniformity of cooling and process stability of billets of different steel grades. In full water mode, the compressed air supply can be completely shut off, significantly reducing compressed air consumption and achieving energy saving and cost reduction. The configuration of the filter components effectively reduces nozzle clogging failures, improving the online nozzle integrity rate and continuous casting machine operating rate.

[0026] Furthermore, the water filtration assembly includes: Water external grille 7, which is detachably installed at the inlet end of the first cavity 2 and has a cylindrical structure, so as to filter water when it passes through its outer wall; The water-inner screen 8 is detachably installed in the first cavity 2 and is hollow inside and communicates with the interior of the water-outer screen 7. The side wall of the water-inner screen 8 is provided with multiple filter holes. Composite bar 9, which is detachably installed inside the first cavity 2 and sleeved outside the water bar 8 to separate the water bar 8 from the connecting channel 4.

[0027] Specifically, such as Figure 1 , Figure 8 , Figure 9As shown, the water filtration assembly is integrated within the first chamber 2 and consists of an external water grille 7, an internal water grille 8, and a composite grille 9. All three are detachably connected for easy cleaning and replacement without requiring a complete nozzle replacement. The external water grille 7 is a cylindrical structure, detachably installed at the inlet of the first chamber 2. Its sidewalls have a porous design with appropriately sized pores, allowing for smooth cooling water flow while intercepting large particles for primary filtration. The internal water grille 8 is detachably installed inside the first chamber 2, communicating with the external water grille 7 to form a continuous water flow channel. Its sidewalls have evenly distributed filter holes with smaller pore sizes than the external water grille 7, used for secondary filtration of the cooling water after primary filtration, intercepting fine particulate impurities. The composite grille 9 is an annular structure, detachably fitted over the internal water grille 8, positioned between the internal water grille 8 and the connecting channel 4, forming a tertiary filtration barrier. Its filtration precision is higher than that of the water-filled screen 8, which can intercept residual tiny impurities and ensure that the cooling water entering the connecting channel 4 is clean and free of impurities; at the same time, it also has the function of guiding water flow, so that the water flow can smoothly transition to the connecting channel 4.

[0028] Furthermore, the air filtration assembly includes: An internal air grille 10 is detachably installed at the inlet end of the second cavity 3 and has a cylindrical structure, so as to filter the gas as it passes through its outer wall; The external air grille 11 is a cylindrical structure and is coaxially sleeved outside the internal air grille 10, and is detachably connected to the inlet end of the second cavity 3.

[0029] Specifically, such as Figure 1 , Figure 8 , Figure 9 As shown, the air filtration assembly is mounted at the inlet end of the second chamber 3, and consists of an inner air grille 10 and an outer air grille 11. Both are detachable, facilitating subsequent individual disassembly, cleaning, or replacement. The inner air grille 10 is a cylindrical structure, detachably installed on the outside of the inlet end of the second chamber 3. Its sidewalls are porous, allowing compressed air to pass smoothly while filtering impurities in the gas. The outer air grille 11 is also a cylindrical structure, coaxially fitted onto the outside of the inner air grille 10, and detachably connected to the inlet end of the second chamber 3, forming a dual filtration structure.

[0030] Furthermore, the dual-channel component includes: The nozzle head body 12 is detachably connected to the outlet end of the second cavity 3, and includes a coaxial inner shell 13 and an outer shell 14. The inner shell 13 is hollow to form the first channel 5. A plurality of second channels 6 are formed between the inner shell 13 and the outer shell 14. The plurality of second channels 6 are evenly distributed along the circumference of the nozzle head body 12. Nozzle cap 15, which is detachably connected to the outer shell 14 of the nozzle head body 12, and the end of the nozzle cap 15 away from the second cavity 3 cooperates with the nozzle head body 12 to form the nozzle.

[0031] Specifically, such as Figure 1 , 4 As shown in Figures 8 and 9, the dual-channel assembly, serving as the core unit for media injection in the nozzle, consists of a nozzle head body 12 and a nozzle head cap 15. Both are detachably connected, allowing for quick assembly and disassembly directly to the outlet end of the second chamber 3 without disassembling the nozzle body 1. This facilitates later maintenance and component replacement while reducing downtime. The nozzle head body 12 is sealed to the outlet end of the second chamber 3. Internally, it employs a coaxial inner shell 13 and outer shell 14 design. The hollow inner shell 13 forms a first channel 5, specifically for water flow delivery in full water cooling mode. The gap between the inner shell 13 and outer shell 14 is circumferentially and uniformly divided to form multiple second channels 6, dedicated to the delivery of water-air mixtures in air-water atomization mode. The independent layout of the dual channels structurally avoids mutual interference when different media are being delivered.

[0032] The nozzle cap 15 is sealed and connected to the outer shell 14 of the nozzle head body 12. The end of the cap 15 away from the second cavity 3 is precisely matched with the outlet end of the nozzle head body 12, together forming the nozzle orifice structure. In the full water cooling mode, the cooling water guided by the switching component is delivered to the nozzle orifice through the first channel 5 and sprayed out. In the air-water atomization mode, the water-air mixture is gathered to the nozzle orifice through the circumferentially evenly distributed second channel 6 and sprayed out. Since the coaxiality of the first channel 5 and the second channel 6 and the nozzle matching structure are precisely calibrated, the atomization angle of the medium sprayed out in both modes can be kept consistent, ensuring the uniformity of billet cooling and process stability.

[0033] Furthermore, a nozzle core 16 is installed inside the nozzle head body 12. The side wall of the nozzle core 16 is provided with a pair of swirling grooves 17, and a gathering groove 18 communicating with the swirling grooves 17 is provided on the side away from the second cavity 3.

[0034] Specifically, such as Figure 1 , 4 As shown in Figures 6, 7, and 8, the nozzle core 16 is fixedly installed inside the nozzle head body 12 and is coaxially adapted to the first channel 5. Its structural design is specifically adapted to the water flow delivery requirements of the full water cooling mode. A pair of swirling grooves 17 are symmetrically provided on the side wall of the nozzle core 16. The swirling grooves 17 extend along the axial direction of the nozzle core 16 and are inclined at a preset angle, which can guide the water flow to form a stable swirling flow. At the same time, a gathering groove 18 is provided on the side of the nozzle core 16 away from the second cavity 3. The gathering groove 18 is connected to both swirling grooves 17 to form an integrated water flow channel of "swirling flow-gathering".

[0035] In the full water cooling mode, the cooling water guided by the switching component enters the nozzle head body 12 through the first channel 5 and first flows through the swirling groove 17 of the nozzle core 16. Under the action of the inclined groove, it generates rotational kinetic energy and forms a uniform swirling flow. Then, the swirling water flow converges into the gathering groove 18. Through the gathering effect of the gathering groove 18, the water flow is kept in a concentrated and stable flow state and finally sprayed out through the nozzle.

[0036] Furthermore, the outlet end of the nozzle cap 15 is bent towards the axis of the nozzle body 12 to form an inward fold 19. The inward fold 19 forms an arc-shaped oscillating surface 20 near the second channel 6, and a guide cone surface 21 is formed away from the second channel 6. The diameter of the guide cone surface 21 near the second cavity 3 is smaller than the diameter of the other end. The outer wall of the outlet end of the nozzle body 12 is provided with a concave turning part 38. The turning part 38 is used for the water-air mixture to turn between the end of the oscillating surface 20 and the beginning of the guide cone surface 21.

[0037] Specifically, such as Figure 1 , 4 As shown in Figures 5 and 9, the nozzle cap 15 is sealed and connected to the outer shell 14 of the nozzle head body 12. Its outlet end is bent towards the side close to the axis of the nozzle head body 12 to form an inner fold 19. The side of the inner fold 19 near the second channel 6 is machined into an arc-shaped oscillating surface 20, while the side away from the second channel 6 forms a guide cone surface 21. The diameter of the guide cone surface 21 near the second cavity 3 is smaller than that of the other end, forming a gradient structure. Correspondingly, the outer wall of the outlet end of the nozzle head body 12 is provided with a concave turning part 38. The contour of the turning part 38 is adapted to the inner contour of the inner fold 19 to form a transition channel.

[0038] In the air-water atomization mode, after the water-air mixture conveyed by the second channel 6 flows out of the nozzle head 12, it first contacts the oscillating curved surface 20. The arc-shaped curved surface structure causes the mixture to generate self-excited oscillation, promoting thorough and uniform mixing of the gas and liquid phases to form a stable gas-liquid ratio. Subsequently, the oscillation-optimized mixture achieves a smooth transition in flow direction through the turning part 38, avoiding turbulence between the airflow and water flow. Finally, guided by the guide cone surface 21, it is ejected from the nozzle in an umbrella-like shape. Throughout the process, the curvature of the oscillating curved surface 20, the taper of the guide cone surface 21, and the concave contour of the turning part 38 are all precisely calibrated to ensure that the atomization angle of the water-air mixture is completely consistent with the injection angle of the first channel 5 in the full water mode.

[0039] Furthermore, the switching component includes: Nozzle head plug 22 is installed at the inlet end of the nozzle head body 12 and connects the second channel 6 and the second cavity 3; Diverter 23 is a hollow cylindrical structure, with one end connected to the nozzle head plug 22 and the other end connected to the air filter assembly. A first water inlet 24 is provided on the side wall of the diverter 23, which is connected to the connecting channel 4. The side wall of the diverter 23 also has a pair of first water outlets 25 and air outlets 26, located on the side of the first water inlet 24 away from the nozzle head plug 22. The air inlet 26 is located on the side of the first water outlet 25 away from the first water inlet 24; the outer wall of the diverter 23 is provided with a concave air guide groove 27 and a water guide groove 28 corresponding to the first water outlet 25 and the air outlet 26. One end of the air guide groove 27 is connected to the air outlet 26, and one end of the water guide groove 28 is connected to the first water outlet 25. The other ends of the air guide groove 27 and the water guide groove 28 are connected to the end of the diverter near the dual-channel assembly and connected to the second channel 6. Diverting pin 29 is movably installed inside the diverter 23 and is hollow inside, with its movement direction along the axial direction of the diverter 23; the side wall of the diverting pin 29 is provided with a second inlet 30 and a second outlet 31, the second inlet 30 being located on the side of the second outlet 31 near the nozzle head plug 22; when the air pipe is open, the diverting pin 29 blocks the nozzle head plug 22, and the first inlet 24 is connected to the second inlet 30; when the air pipe is blocked, the diverting pin 29 opens the nozzle head plug, so that the first inlet 24 is connected to the nozzle head plug 22.

[0040] Specifically, such as Figure 1 , 2 As shown in Figures 3, 8, and 9, the switching assembly, as the core execution unit for nozzle mode switching, is located within the second chamber 3. It consists of a nozzle head plug 22, a flow divider 23, and a flow divider pin 29. After assembly, these components form a sealed and movable switching mechanism. No additional drive device is required; the state switching is achieved solely through the pressure difference generated by the opening and closing of the air pipe. The nozzle head plug 22 is fixedly installed at the inlet end of the nozzle head body 12. Its internal channel connects the second channel 6 and the second chamber 3, providing precise flow guidance for the gas-water mixture or cooling water. The flow divider 23 is a hollow cylindrical structure with one end sealed and connected to the nozzle head plug 22, and the other end connected to the air filter assembly, forming a channel for the diversion and convergence of gas and water.

[0041] The side wall of the distributor 23 is provided with a first water inlet 24, which is precisely connected to the connecting channel 4 to ensure that the cooling water filtered by the first cavity 2 can flow smoothly into the distributor 23. The side wall of the distributor 23 is also provided with a pair of first water outlets 25 and air outlets 26, both of which are located on the side of the first water inlet 24 away from the nozzle head plug 22, and the air outlet 26 is located on the side of the first water outlet 25 away from the first water inlet 24, forming an axial distribution structure of "water inlet-water outlet-air outlet". The outer wall of the distributor 23 is provided with a concave air guide groove 27 and a water guide groove 28 corresponding to the first water outlet 25 and the air outlet 26. One end of the air guide groove 27 is connected to the air outlet 26, and one end of the water guide groove 28 is connected to the first water outlet 25. The two, together with the side wall of the second cavity 3, form channels for air and water respectively. The other end of the air guide groove 27 and the water guide groove 28 are connected to the end of the distributor 23 near the dual-channel assembly and are connected to the second channel 6 together, providing a dedicated channel for air-water mixing.

[0042] The diverter pin 29 is movably installed inside the hollow interior of the diverter 23, moving along the axial direction of the diverter 23. Its interior is hollow, with a second inlet 30 and a second outlet 31 on its side wall. The second inlet 30 is located on the side of the second outlet 31 closest to the nozzle head plug 22, forming a channel layout adapted to the water flow direction. The two operating states of the switching component are as follows: When the external air pipe is closed, the switching component is in the first state. At this time, the splitter pin 29 opens the nozzle head plug 22 under its own force balance, so that the first water inlet 24 of the splitter 23 is directly connected to the nozzle head plug 22. The cooling water flowing in through the connecting channel 4 enters the splitter 23 through the first water inlet 24, and then directly enters the first channel 5 through the nozzle head plug 22, and finally sprays out through the nozzle, realizing full water-cooled cooling.

[0043] When the external air pipe is opened, the switching component switches to the second state. Compressed air enters the hollow interior of the distributor 23 through the air filter assembly, pushing the distributor pin 29 axially towards the nozzle head plug 22 until the distributor pin 29 and the nozzle head plug 22 form a sealed contact, blocking the direct connection between the first water inlet 24 and the nozzle head plug 22. At this time, the blockage of the second water inlet 30 is removed and it connects with the first water inlet 24. Cooling water flows into the hollow interior of the distributor pin 29 through the second water inlet 30, then flows out of the distributor pin 29 through the second water outlet 31, and then enters the water guide groove 28 through the first water outlet 25. At the same time, compressed air flows into the air guide groove 27 through the air outlet 26, and finally the air and water are mixed at the junction of the air guide groove 27 and the water guide groove 28. The mixture is transported to the nozzle through the second channel 6 and sprayed out, realizing the atomization and weak cooling of air and water.

[0044] Furthermore, the inner wall of the diverter 23 is provided with an annular limiting protrusion 32, and the end of the diverter pin 29 near the air filter assembly is provided with a limiting part 33; an elastic reset member 34 is sleeved on the outer side of the diverter pin 29, one end of the elastic reset member 34 is in contact with the limiting part 33, and the other end is in contact with the limiting protrusion 32.

[0045] like Figure 1 , 3 As shown in Figures 8 and 9, the inner wall of the diverter 23 is integrally formed with an annular limiting protrusion 32. This limiting protrusion 32 is continuously distributed along the circumference of the diverter 23, forming a limiting reference for the movement of the diverter pin 29. Correspondingly, the end of the diverter pin 29 near the air filter assembly has an outwardly extending limiting portion 33. The outer diameter of the limiting portion 33 is adapted to the inner wall of the diverter 23, enabling precise axial contact with the limiting protrusion 32. Simultaneously, an elastic reset member 34 is sleeved on the outer side of the diverter pin 29. One end of the elastic reset member 34 is in close contact with the end face of the limiting portion 33, and the other end abuts against the end face of the limiting protrusion 32. In its natural state, it always maintains a pre-compressed state, providing continuous reset elasticity for the diverter pin 29. In this embodiment, the elastic reset member 34 can be selected as a spring.

[0046] When the trachea is blocked, due to the absence of external air pressure, the elastic reset member 34 releases the pre-compression elastic force, pushing the diverter pin 29 to move along the axis of the diverter 23 towards the direction close to the air filter assembly, until the limiting part (33) abuts against the inlet end of the second space 3. The diverter pin 29 opens the nozzle head plug 22, ensuring smooth communication between the first water inlet 24 and the nozzle head plug 22, and the cooling water can flow steadily into the first channel 5. After compressed air enters the hollow interior of the distributor 23, it generates an axial thrust that acts on the limiting part 33. This thrust overcomes the pre-compression elastic force of the elastic reset member 34 and pushes the distributor pin 29 to move away from the air filter assembly and closer to the nozzle head plug 22 until the distributor pin 29 forms a sealing contact with the nozzle head plug 22. At this time, a preset distance is maintained between the limiting part 33 and the limiting protrusion 32 to prevent the distributor pin 29 from moving excessively, which could lead to seal failure or component collision damage.

[0047] Furthermore, the outer periphery of the limiting part 33 is provided with an annular first concave part, and the first concave part is embedded with a first sealing ring 35; the inner wall of the diverter 23 is formed with an annular second concave part, the second concave part is located on the side of the limiting protrusion 32 away from the elastic limiting member, and is embedded with a second sealing ring 36.

[0048] Specifically, such as Figure 1 , 3As shown in Figures 8 and 9, the outer periphery of the limiting portion 33 is provided with an annular first recess, the size of which is precisely matched with the first sealing ring 35. After the first sealing ring 35 is embedded therein, it fits tightly against the inner wall of the diverter 23, forming a radial sealing structure. Correspondingly, an annular second recess is formed on the inner wall of the diverter 23. The second recess is located on the side of the limiting protrusion 32 away from the elastic reset member 34, and its outline matches the second sealing ring 36. After the second sealing ring 36 is embedded, it forms a sealing contact with the outer wall of the diverter pin 29, constituting another radial sealing barrier. Both sealing rings are made of wear-resistant and media corrosion-resistant elastic materials to ensure that they can maintain good sealing performance even after long-term use.

[0049] Furthermore, a guide slope 37 is formed on the outer wall of the inner shell 13 of the nozzle head 12 away from the second cavity 3. The guide slope 37 is used to guide the gas-liquid mixture to the oscillating surface 20.

[0050] Specifically, such as Figure 1 , 4 As shown, the guide ramp 37 is integrally formed on the outer wall of the inner shell 13 of the nozzle head 12 at the end away from the second cavity 3. Its inclination angle is precisely calibrated to match the outlet direction of the second channel 6 and the contour of the oscillating surface 20, forming a smooth guide path. This structure does not increase the complexity of the components and is integrated with the inner shell 13, ensuring structural stability and durability. In the gas-liquid atomization mode, the gas-liquid mixture that flows uniformly out of the second channel 6 will first contact the guide ramp 37 when it reaches the outlet end of the nozzle head 12. With the guiding effect of the ramp, the gas-liquid mixture is smoothly guided to the oscillating surface 20 of the nozzle cap 15, avoiding media deviation, local aggregation, or flow turbulence, and ensuring that the gas-liquid mixture can fully and uniformly contact the oscillating surface 20.

[0051] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A dual-atomization flow channel composite medium switching nozzle for a continuous casting machine, characterized in that, include: The nozzle body (1) has a first cavity (2) and a second cavity (3) formed inside it; the inlet end of the first cavity (2) is used to connect to an external water pipe and is provided with a water filter assembly, and the outlet end is connected to the second cavity (3) through a connecting channel (4); the inlet end of the second cavity (3) is used to connect to an external air pipe and is provided with an air filter assembly. A dual-channel assembly is provided at the outlet end of the second cavity (3) and includes a nozzle, a first channel (5), and a second channel (6). The second channel (6) is distributed on the outer periphery of the first channel (5) and is used to pass a water-air mixture; the first channel (5) is used to pass water. A switching component is disposed in the second cavity (3) and includes a first state and a second state; when the trachea is blocked, the switching component is placed in the first state to connect the connecting channel (4) with the first channel (5); when the trachea is open, the switching component is placed in the second state to mix gas and water after passing through the switching component and enter the second channel (6).

2. The dual-atomization flow channel composite medium switching nozzle for continuous casting machines according to claim 1, characterized in that, The water filtration assembly includes: Water external grille (7), which is detachably installed at the inlet end of the first cavity (2) and has a cylindrical structure, so that water is filtered when it passes through its outer wall; The water-inner grid (8) is detachably installed in the first cavity (2) and is hollow inside and communicates with the interior of the water-outer grid (7). The side wall of the water-inner grid (8) is provided with multiple filter holes. Composite bar (9), which is detachably installed inside the first cavity (2) and sleeved outside the water bar (8) to separate the water bar (8) from the connecting channel (4).

3. The dual-atomization flow channel composite medium switching nozzle for continuous casting machines according to claim 1, characterized in that, The air filtration assembly includes: An internal air grille (10) is detachably installed at the inlet end of the second cavity (3) and has a cylindrical structure so that the gas is filtered when it passes through its outer wall; The external air grille (11) is a cylindrical structure and is coaxially sleeved outside the internal air grille (10), and is detachably connected to the inlet end of the second cavity (3).

4. The dual-atomization flow channel composite medium switching nozzle for continuous casting machines according to claim 1, characterized in that, The dual-channel component includes: The nozzle head body (12) is detachably connected to the outlet end of the second cavity (3) and includes a coaxial inner shell (13) and outer shell (14). The inner shell (13) is hollow to form the first channel (5). A plurality of second channels (6) are formed between the inner shell (13) and the outer shell (14). The plurality of second channels (6) are evenly distributed along the circumference of the nozzle head body (12). Nozzle cap (15) is detachably connected to the outer shell (14) of the nozzle head body (12). The end of the nozzle cap (15) away from the second cavity (3) cooperates with the nozzle head body (12) to form the nozzle.

5. The dual-atomization flow channel composite medium switching nozzle for continuous casting machines according to claim 4, characterized in that, The nozzle head body (12) is equipped with a nozzle core (16). The side wall of the nozzle core (16) is provided with a pair of swirling grooves (17), and a gathering groove (18) communicating with the swirling grooves (17) is provided on the side away from the second cavity (3).

6. The dual-atomization flow channel composite medium switching nozzle for continuous casting machines according to claim 4, characterized in that, The outlet end of the nozzle cap (15) is bent towards the axis of the nozzle body (12) to form an inward fold (19). The inward fold (19) forms an arc-shaped oscillating surface (20) near the second channel (6) and a guide cone (21) is formed away from the second channel (6). The diameter of the guide cone (21) near the second cavity (3) is smaller than the diameter of the other end. The outer wall of the outlet end of the nozzle body (12) is provided with a concave turning part (38). The turning part (38) is used for the water-air mixture to turn between the end of the oscillating surface (20) and the beginning of the guide cone (21).

7. The dual-atomization flow channel composite medium switching nozzle for continuous casting machines according to claim 1, characterized in that, The switching component includes: Nozzle head plug (22), the nozzle head plug (22) is installed at the inlet end of the nozzle head body (12) and connects the second channel (6) and the second cavity (3); The diverter (23) is a hollow columnar structure, with one end connected to the nozzle head plug (22) and the other end connected to the air filter assembly. The diverter (23) has a first water inlet (24) on its side wall, which is connected to the connecting channel (4). The diverter (23) also has a pair of first water outlets (25) and air outlets (26) on its side wall. The first water outlets (25) and air outlets (26) are located on the side of the first water inlet (24) away from the nozzle head plug (22), and the air outlets... The port (26) is located on the side of the first outlet (25) away from the first inlet (24); the outer wall of the diverter (23) is provided with a concave air guide groove (27) and a water guide groove (28) corresponding to the first outlet (25) and the air outlet (26). One end of the air guide groove (27) is connected to the air outlet (26), and one end of the water guide groove (28) is connected to the first outlet (25). The other ends of the air guide groove (27) and the water guide groove (28) are connected to the end of the diverter near the dual-channel assembly and connected to the second channel (6). Diverting pin (29), which is movably installed inside the diverter (23) and is hollow inside, and moves along the axial direction of the diverter (23); the side wall of the diverting pin (29) is provided with a second inlet (30) and a second outlet (31), the second inlet (30) being located on the side of the second outlet (31) near the nozzle head plug (22); when the air pipe is open, the diverting pin (29) blocks the nozzle head plug (22), and the first inlet (24) is connected to the second inlet (30); when the air pipe is blocked, the diverting pin (29) opens the nozzle head plug so that the first inlet (24) is connected to the nozzle head plug (22).

8. The dual-atomization flow channel composite medium switching nozzle for continuous casting machines according to claim 7, characterized in that, The inner wall of the diverter (23) is provided with an annular limiting protrusion (32), and the diverter pin (29) is provided with a limiting part (33) at one end near the air filter assembly; an elastic reset member (34) is sleeved on the outside of the diverter pin (29), one end of the elastic reset member (34) is in contact with the limiting part (33), and the other end is in contact with the limiting protrusion (32).

9. The dual-atomization flow channel composite medium switching nozzle for continuous casting machines according to claim 8, characterized in that, The outer periphery of the limiting part (33) is provided with an annular first concave part, and the first concave part is fitted with a first sealing ring (35); the inner wall of the diverter (23) is formed with an annular second concave part, the second concave part is located on the side of the limiting protrusion (32) away from the elastic limiting member, and is fitted with a second sealing ring (36).

10. The dual-atomization flow channel composite medium switching nozzle for continuous casting machines according to claim 5, characterized in that, A guide slope (37) is formed on the outer side wall of the inner shell (13) of the nozzle head (12) away from the second cavity (3), and the guide slope (37) is used to guide the gas-liquid mixture to the oscillating surface (20).

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