Compact variable ring nozzle for ultra-fast cooling of rods and wires and rod and wire cooling process

Abstract

The present invention provides a compact, variable, annular nozzle for ultra-fast cooling of rods and wires. This device, belonging to the field of cooling equipment, comprises a gas flow channel for conveying airflow and a liquid flow channel for conveying water. The gas and liquid flow channels are separated from each other. The gas flow channel includes an air jet slot for ejecting airflow, and the liquid flow channel includes a water jet hole for ejecting water. The water jet hole is positioned closely adjacent to the air jet slot, enabling the ejection of airflow and water mist toward the rods and wires, either independently or simultaneously. This device can rapidly cool rods and wires, flexibly adjust cooling modes, and has a compact structure.

Description

Technical Field

[0001] The present invention relates to a cooling device, and more particularly to a compact variable annular nozzle for ultra-fast cooling of rods and wires. Background Art

[0002] The next-generation, highly efficient and energy-efficient hot rolling thermomechanical treatment (TMCP) process technology for hot-rolled bar and wire rod production is based on a chemical composition design and refining process that combines microalloying and purification. On the one hand, it requires strict hot deformation control during rolling, particularly requirements for the critical pass reduction Ri>RSC (%) in the recrystallization zone and the cumulative reduction Ri (%) in the non-recrystallization zone. On the other hand, it requires further increases in the post-rolling cooling rate and strict control of the final cooling temperature. This combines controlled rolling hot deformation with controlled cooling phase transformation heat treatment to achieve the microstructure and mechanical properties required for high-strength steel.

[0003] Current controlled cooling in hot rolling mills is generally divided into three stages: primary cooling, secondary cooling, and final air cooling. Primary cooling is the most important. In existing hot-rolled bar and wire technologies, primary cooling typically involves water cooling, meaning the finished product, immediately after exiting the finishing mill, passes through a water cooling device for forced controlled cooling. The purpose of this first stage of intense cooling is typically to control the microstructure of the deformed austenite, inhibit grain growth, prevent premature carbide precipitation and the formation of network carbides, fix dislocations caused by deformation, increase the degree of supercooling during phase transformation, and prepare the structure for the transformation of the deformed austenite to ferrite, cementite, and pearlite. This is because the microstructure prior to the phase transformation directly affects the transformation mechanism, the morphology of the transformation products, the grain size, and the properties of the steel.

[0004] In general, the main disadvantages of hot rolled bar and wire production are:

[0005] (1) It is difficult to increase the cooling rate after it reaches a certain value, and it is difficult to meet the requirements of the new process.

[0006] (2) It is difficult to control the temperature of the cooling water in the cooling equipment. This is because the water temperature has a great influence on the cooling effect, which directly affects the cooling rate. If the water temperature is too high, the cooling rate will be insufficient, and insufficient supercooling will be produced, resulting in insufficient depth of surface tempered martensite and insufficient tensile strength of the steel bar. The water temperature should be controlled below 30°C.

[0007] (3) Water pressure control: Water pressure also significantly affects the cooling effect. Sufficient water pressure is necessary to break the oxide film attached to the steel bar surface during the cooling process. In addition, high enough water pressure can eliminate the influence of gravity, allowing the steel bar to float in the center of the turbulent flow tube and achieve uniform cooling. Generally, the water pressure should be controlled above 0.7 MPa.

[0008] (4) High technical requirements for pipe size and shape control;

[0009] Existing water-through cooling systems typically come in two forms: the sleeve-and-tube type and the turbulent-flow tube type. The sleeve-and-tube type offers uniform cooling, but low cooling intensity and high requirements for water pressure, flow rate, and cooling line length. The turbulent-flow tube type, on the other hand, offers high cooling intensity but is difficult to master in terms of internal cavity design, which can easily lead to uneven cooling and uncontrolled wave bending. Furthermore, the steel bars create significant resistance within the turbulent-flow tube, which can lead to steel accumulation in severe cases.

[0010] (5) The selection of the water-penetrating position has high requirements. Generally speaking, the shorter the water-cooling line is from the finished product rack, the better. It is best to put the rods and wires into water immediately after they leave the finished product rack. This can reduce the degree of austenite recrystallization, preserve the effect of rolling deformation, and achieve better comprehensive mechanical properties. For example, in the Japanese standard SD390 thread, the standard stipulates that the upper limit of yield strength cannot exceed 510MPa. However, in the actual adjustment process, in order to control bending, the performance is often too high. Although it can return to normal values after sufficient aging, under the condition of fast turnover, the product may be put into use within a week. At this time, due to insufficient aging period, the strength is still too high, which is easy to cause quality problems. At this time, the water-penetrating process should be adopted in the second half of the water-cooling line. In the second half of the water-penetrating process, after 1 second, the austenite undergoes recrystallization and the grain size can generally grow by one order of magnitude. In addition, because the steel temperature is reduced, the degree of supercooling is reduced, which can also reduce the performance. The steel bars treated in this way have little aging and stable performance.

[0011] (6) The problem of wave bending is difficult to solve. When using the water-penetrating process to produce steel with a size below φ20, wave bending is very likely to occur. This is mainly due to the low water-penetrating strength and insufficient performance, which easily causes wave bending. When the water-penetrating strength is increased, it is easy to cause steel piling. This problem has become a bottleneck restricting production. Because small specifications have poor rigidity, they are more likely to produce uneven cooling when encountering resistance, thus causing bending. Summary of the Invention

[0012] The present invention provides a compact variable annular nozzle for ultra-fast cooling of bars and wires, which solves the problems in the existing production of hot-rolled bars and wires, such as the urgent need to further improve the cooling rate, the inability to flexibly adjust the cooling mode, large limitations on installation and use, and poor adaptability.

[0013] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: a compact variable annular nozzle for ultra-fast cooling of rods and wires, comprising a gas flow channel for conveying air flow and a liquid flow channel for conveying water, the gas flow channel and the liquid flow channel are separated from each other, the gas flow channel includes an air jet slot for ejecting air flow, the liquid flow channel includes a water jet hole for ejecting water flow, and the water jet hole is arranged close to the air jet slot so as to be able to eject air flow and water mist toward the rods and wires separately or synchronously.

[0014] Specifically, the aforementioned gas flow channel in the present invention includes an air inlet channel, and the liquid flow channel includes a water inlet channel; the air inlet channel is connected to at least one primary air cavity, the primary air cavity is connected to the secondary air cavity, the secondary air cavity is connected to the air jet gap, and the primary air cavity and the secondary air cavity are separated by an air dividing piece, and the air dividing piece is provided with an air-permeable gap, and the primary air cavity and the secondary air cavity are connected through and only through the air-permeable gap; the water inlet channel is connected to a primary water cavity, the primary water cavity is connected to the secondary water cavity, the secondary water cavity is connected to the water spray hole, and the primary water cavity and the secondary water cavity are separated by a water dividing piece, and the primary water cavity and the secondary water cavity are connected through and only through the water-permeable gap on the water dividing piece.

[0015] Furthermore, the air inlet channel and the water inlet channel are both arranged at intervals from each other in an annular sleeve having an annular sleeve, and are arranged along a direction parallel to the axial direction of the annular sleeve. The inlet end of the air inlet channel is connected to an air supply pipe, and the inlet end of the water inlet channel is connected to a water supply pipe.

[0016] Furthermore, it also includes a pair of pressure rings that are detachable and coaxially installed on the two ports of the annular sleeve. In the area between the two pressure rings on the inner side of the annular sleeve, an annular core ring is coaxially provided. The two areas formed between the core ring and the two pressure rings and the annular sleeve are divided into a primary air cavity and a secondary air cavity by the gas separator. The part of the core ring that is close to its own inner annular surface is located between the two pressure rings, and the annular gap formed with the two pressure rings constitutes the air jet gap.

[0017] Furthermore, a coaxial annular cavity is provided in the ring wall of the core ring, and the annular cavity is divided into the primary water cavity and the secondary water cavity by the water dividing member. One end of the water spray hole is connected to the secondary water cavity, and the other end extends to the inner annular surface and penetrates the inner annular surface.

[0018] Furthermore, the portion of the core ring close to the inner annular surface is an annular ring, and the water spray holes are arranged along the radial direction of the annular ring so that the two air jet slots are arranged on both sides of the water spray hole.

[0019] Furthermore, the air dividing member and the water dividing member are both annular structures, so as to form an air dividing ring and a water dividing ring respectively provided with the air permeable slits and the water permeable slits.

[0020] Furthermore, the air-permeable slit and the water-permeable slit are both rectangular strip holes, the length direction of which is parallel to the axis of the air-dividing ring and the water-dividing ring, and the water-dividing ring is located directly above the two air-dividing rings.

[0021] Furthermore, one end of the rectangular strip hole passes through the end faces of the air dividing ring and the water dividing ring to form rectangular notches on the air dividing ring and the water dividing ring, and the opening directions of two adjacent rectangular notches are opposite.

[0022] In addition, the present invention also provides a rod and wire cooling process, which mainly uses the aforementioned compact variable rod and wire ultra-fast cooling annular nozzle for cooling, and arranges several of the annular nozzles in a straight line at even intervals. The water supply pipe is arranged on the outside of the air supply pipe, and the water supply pipe and the air supply pipe are arranged along the axial direction of the guide seat and are located on both sides of the guide seat. The water supply pipe and the air supply pipe are respectively connected to the corresponding water inlet channel and air inlet channel through four conveying pipes, and a water supply pipe and an air supply pipe are provided on each side; when air and water are respectively introduced into the water supply pipe and the air supply pipe, it is ensured that when the air jet gap and the water spray hole spray the corresponding fluid at the same time, the droplet diameter of the mixed aerosol is >60um.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. Compared with the existing water-through cooling technology, the cooling rate is increased exponentially, meeting the process requirements of the new generation of high-efficiency and energy-saving hot rolling thermomechanical treatment TMCP process technology.

[0025] 2. Due to the different principles and installation methods, the present invention does not have the problems of existing water-through cooling technology, such as high requirements for cooling water temperature control and cooling pipe control technology; because the product structure is compact and has multiple working modes, it can include the existing (traditional technology) water-through cooling working mode, adapting to the existing process on site while facilitating process adjustment and later transformation.

[0026] 3. The product's compact structure makes it easy to install and maintain in confined spaces. Therefore, there's no need for major adjustments or modifications to existing rolling equipment and pressure control systems, saving users investment in equipment and operating costs, and facilitating rapid process upgrades.

[0027] 4. For the problem of wave bending, this cooling ring nozzle can be flexibly installed and used in a combined modular setting. Different modules provide different cooling rates (a combination of strong cooling and slow cooling), which can effectively solve the bending caused by excessive cooling at a certain position, or the steel piling phenomenon caused by excessive resistance of steel passing through.

[0028] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of a three-dimensional structure of the present invention;

[0030] Figure 2 This is an axial cross-sectional view of the present invention;

[0031] Figure 3 for Figure 2Axial cross-sectional view of the middle annular sleeve;

[0032] Figure 4 for Figure 3 Enlarged image of the upper middle part;

[0033] Figure 5 for Figure 3 Enlarged view of the lower middle part;

[0034] Figure 6 It is a structural diagram of the water dividing ring and the gas dividing ring;

[0035] Figure 7 This is a schematic diagram of several annular nozzles used in series;

[0036] Figure 8 The different heat conduction state curves of hot rolled steel water cooling;

[0037] Figure 9 This is the influence curve of water mist droplets with different diameters on heat conduction.

[0038] Among them, the air inlet channel 1, the water spray hole 2, the air jet slit 3, the primary air cavity 4, the secondary air cavity 5, the guide seat 6, the annular sleeve 601, the air dividing ring 8, the air permeable slit 9, the primary water cavity 10, the secondary water cavity 11, the water dividing ring 12, the core ring 13, the pressure ring 14, the air supply pipe 15, the water supply pipe 16, and the delivery pipe 17. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features, objectives and functions of the present invention clearer and easier to understand, the present invention is further described below with reference to the accompanying drawings and specific embodiments:

[0040] In one of the specific embodiments of the present invention, a compact variable type rod and wire ultra-fast cooling annular nozzle is specifically introduced. Its structure not only includes a gas flow channel for conveying air flow and a liquid flow channel for conveying water, but also, when specifically designed and manufactured, the gas flow channel and the liquid flow channel are separated from each other, so that air flow and cooling water can be conveyed relatively independently. At the same time, Figure 3-4 As shown, the gas flow channel includes an air jet slot 3 for ejecting air flow, and the liquid flow channel includes a water jet hole 2 for ejecting water flow. The water jet hole 2 is arranged close to the air jet slot 3 so that air flow and water mist can be ejected synchronously toward the rods and wires, realizing a mixed synchronous cooling mode of air cooling and water cooling. When necessary, the gas flow channel and the liquid flow channel can be used selectively for simple air cooling or water cooling.

[0041] In actual application, such as Figure 2-4As shown in the structure, the gas flow channel of this embodiment includes an air inlet channel 1, and the liquid flow channel includes a water inlet channel. Specifically, this air inlet channel 1 is connected to at least one primary air cavity 4, the primary air cavity 4 is connected to the secondary air cavity 5, the secondary air cavity 5 is connected to the jet gap 3, and the primary air cavity 4 and the secondary air cavity 5 are separated by an air separator, and an air permeable gap 9 is provided on the air separator. The primary air cavity 4 and the secondary air cavity 5 are connected through the air permeable gap 9, so that the cooling air flow or wind enters the nozzle from the air inlet channel 1, first enters the primary air cavity 4, and then enters the secondary air cavity 5 after passing through the air permeable gap 9, and is finally blown out from the air permeable gap 9 to perform air cooling on the rods and wires passing through the guide seat 6. Similarly, the water inlet channel in this embodiment is connected to a primary water chamber 10, which is connected to a secondary water chamber 11. The secondary water chamber 11 is connected to the water spray hole 2, and the primary water chamber 10 and the secondary water chamber 11 are separated by a water divider. The primary water chamber 10 and the secondary water chamber 11 are connected by a water-permeable slit on the water divider. After the cooling water enters the water inlet channel, it flows into the primary water chamber 10, is injected into the secondary water chamber 11 after passing through the water-permeable slit, and is finally sprayed out from the water spray hole 2 to water-cool the rods and wires passing through the guide seat 6. When air and water enter the air inlet channel 1 and the water inlet channel respectively, the rods and wires passing through the guide seat 6 can be quickly and simultaneously cooled by water and air, so that the same nozzle can achieve different cooling modes using different control methods, fully meeting the cooling needs of different rods and wires.

[0042] Based on the above structural principles, more specifically, continue to refer to Figure 3-4 as well as Figure 5 The air inlet channel 1 and the water inlet channel (not shown in the figure) are arranged at intervals from each other in a guide seat 6 with an annular sleeve 601. The annular sleeve 601 of the guide seat 6 can allow rods and wires to pass through coaxially. The above air inlet channel 1 and water inlet channel can be arranged along the axial direction parallel to the annular sleeve 601 during manufacturing. The inlet end of the air inlet channel 1 is connected to an air supply pipe 15, and the inlet end of the water inlet channel is connected to a water supply pipe 16, so as to input cooling air flow and cooling water respectively.

[0043] As one of the specific implementation structures, Figure 2-5, this embodiment also includes a pair of detachable pressure rings 14 coaxially mounted on the two ends of the annular sleeve 601. In the area between the two pressure rings 14 on the inner side of the annular sleeve 601, a core ring 13 also roughly annular is coaxially provided. The two areas formed between the core ring 13 and the two pressure rings 14 and the annular sleeve 601 are divided into a primary air cavity 4 and a secondary air cavity 5 by an air separator. The part of the core ring 13 on its own inner annular surface is located between the two pressure rings 14, and the annular gap formed with the two pressure rings 14 constitutes an air jet gap 3, so that the cooling air flow is ejected from this annular air jet gap 3 to quickly cool the rods and wires passing through the center of this annular air curtain. At the same time, during the specific production, such as Figure 4-5 In this embodiment, an annular cavity coaxial with the core ring 13 is further provided in the ring wall of the core ring 13. The annular cavity is divided into a primary water cavity 10 and a secondary water cavity 11 by a water dividing piece. One end of the water spray hole 2 is connected to the secondary water cavity 11, and the other end of the water spray hole 2 extends to the inner annular surface and penetrates the inner annular surface to form an outlet for cooling water. It is best that the part of the core ring 13 close to the inner annular surface is an annular ring, and the water spray hole 2 is arranged along the radial direction of the annular ring so that the two air jets 3 are arranged on both sides of the water spray hole 2. With this design, the rods and wires passing through the center of the core ring 13 can be water-cooled, or, in combination with the aforementioned air jets 3, a number of radially sprayed cooling water flows can be evenly spaced on the circular contour of the formed annular cooling air curtain to better perform mixed cooling.

[0044] As the second specific implementation structure, continue to refer to Figure 4-5 as well as Figure 6 As shown, the air divider and water divider in this embodiment are both annular structures, corresponding to the air divider ring 8 and the water divider ring 12 with air slits 9 and water slits. The air slits 9 and water slits mentioned above are all rectangular strip holes. The length direction of the rectangular strip holes needs to be parallel to the axis of the air divider ring 8 and the water divider ring 12, and the water divider ring 12 is located directly above the two air divider rings 8 to better achieve air cooling and water cooling. More specifically, one end of the rectangular strip hole passes through the end faces of the air divider ring 8 and the water divider ring 12 to form a rectangular notch on the air divider ring 8 and the water divider ring 12. The opening directions of the two adjacent rectangular notches are opposite, which more evenly disperses the air flow and water mist, and improves the uniformity and stability of the cooling air and cooling water flow.

[0045] Finally, this embodiment also specifically introduces a bar and wire cooling process, which mainly uses the aforementioned compact variable bar and wire ultra-fast cooling annular nozzle for cooling, Figure 1 The annular nozzles shown in are evenly spaced and arranged in a straight line, as shown in Figure 7As shown, water supply pipe 16 is disposed outside air supply pipe 15. Both water supply pipe 16 and air supply pipe 15 are arranged axially along guide base 6 and on either side of guide base 6. Each of these pipes is connected to the corresponding water inlet channel and air inlet channel 1 via four delivery pipes 17, with one water supply pipe 16 and one air supply pipe 15 provided on each side. It should also be noted that when air and water are introduced into water supply pipe 16 and air supply pipe 15, respectively, it is important to ensure that when the corresponding fluids are simultaneously ejected from air jet slit 3 and water spray hole 2, the diameter of the mixed aerosol droplets is >60 μm.

[0046] The main reason why traditional water-through cooling technology is difficult to improve the cooling rate is that its core heat exchange method is mainly strong convection heat exchange (the water circulation system controls the water temperature in the cooling equipment), and when the room temperature water in the cooling equipment contacts the steel surface above 800℃, transition boiling, film boiling, and some nucleate boiling are formed. Figure 8 The research data on the heat exchange state and efficiency of water cooling of steel shown in the figure shows that when water reaches nucleate boiling, the heat transfer efficiency is the highest, that is, the cooling rate is the largest, while the efficiency of other heat conversion methods is relatively low.

[0047] The compact, variable-speed annular nozzle for ultra-fast cooling of rods and wires in this embodiment is based on this research. While utilizing the same technical framework as through-water cooling, it employs a fundamentally different heat exchange method, nucleate boiling, for ultra-fast cooling. Theoretical calculations show that the latent heat of vaporization λ absorbed by a unit mass of water during the liquid-to-gas phase transition at 100°C is 540K / g, while the amount of heat absorbed per degree increase in water temperature is 1K. Under ideal conditions, during nucleate boiling, the amount of heat absorbed and removed by each gram of water vaporizing is 540 times greater than the amount of heat absorbed and conducted by water. When the water temperature rises by 30°C, it only removes 30K of heat, making vaporization cooling 18 times more efficient than water cooling. Therefore, based on this theory, the compact, variable-speed annular nozzle for ultra-fast cooling of rods and wires in this embodiment utilizes a combined air-water cooling method. The temperature-controlled mediums include water and air, which can be used for cooling independently or in combination. The cooling mode can be changed according to different cooling process rate requirements, and water cooling, air slow cooling or mist ultra-fast cooling can be flexibly selected. The main cooling mode can be set as mist ultra-fast cooling, that is, a certain proportion of water and air are sprayed at the same time, and the air and water are transported and sprayed separately. The air and water are mixed when they are ejected to form a water mist with a certain aerosol particle size, which is sprayed onto the steel surface to quickly take away the heat from the steel surface and achieve the purpose of reducing the temperature of the steel plate.

[0048] Specifically, the water mist sprayed from the water spray hole 2 in this embodiment quickly vaporizes when it encounters the high-temperature steel plate. When the amount of water on the steel surface is small, the vaporized water can smoothly leave the steel surface, thus forming nucleate boiling cooling, which is the most efficient cooling method mentioned above. When the amount of water on the steel surface is large, the vaporized water cannot smoothly leave the steel plate, so nucleate boiling cooling cannot be formed, and only film boiling cooling can be formed. Ultimately, heat can only be dissipated through heat conduction of water. Therefore, considering the following Figure 9 As shown in the figure, the droplet diameter of the aerosol in the present invention is recommended to be set to not less than 60 μm.

[0049] As can be seen, the present invention directly simplifies the nozzle core design and integrates it into a compact, ring-shaped assembly suitable for bar and wire cooling. This significantly reduces the device's size, facilitating installation in confined spaces and expanding its applicability. This eliminates the need for major adjustments and modifications to existing on-site rolling equipment and pressure control systems, saving users investment in equipment and operating costs, facilitating rapid process upgrades, and facilitating large-scale deployment.

[0050] Secondly, the fast cooling annular nozzle in the above embodiment adopts an independent structural design with air-water separation, which can change the cooling mode according to different cooling process rate requirements, and can realize different cooling modes by using different control methods for the same nozzle.

[0051] Again, as Figure 7 As shown, the modular design integrated in the present invention is more targeted to the specifications of rod and wire billets. The design of the corresponding water spray holes 2 and other features of each module is highly consistent, which can fundamentally eliminate the installation errors of the nozzles for spraying water and air flow, as well as the accuracy problems such as jet deviation during long-path cooling. Therefore, compared with the existing independent nozzles, the annular distribution of the aerosol jet is more uniform, the aerosol density is higher, and the effective utilization rate of the aerosol is higher, thereby better meeting the stringent requirements of the ultra-fast cooling process on spray uniformity and being more convenient for daily maintenance of the equipment.

[0052] In addition, the present invention changes the traditional gas-water mixing inside the nozzle to mixing outside the nozzle. By adjusting the gas-water ratio, atomized water jets of different particle sizes can be obtained to meet different cooling process requirements. At the same time, the annular sleeve 601 is equipped with a large-diameter water chamber and air chamber, so that the water and air have an obvious deceleration buffer area before mixing, and the ability to resist the pulse fluctuation of the water and air supply system is improved, so that the nozzle can mix a continuous and stable water-gas mixed jet.

[0053] Finally, the present invention also adds auxiliary water dividing rings 12 and air dividing rings 8, so that the water and air media can be evenly, continuously and stably distributed in the water chambers and air chambers in their respective rings, ensuring that the media have exactly the same properties at different positions in the rings.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A compact, variable, annular nozzle for ultra-fast cooling of rods and wires, comprising a gas flow channel for conveying air and a liquid flow channel for conveying water, characterized in that: The gas flow channel and the liquid flow channel are separated from each other, the gas flow channel includes an air jet slot (3) for ejecting air flow, and the liquid flow channel includes a water jet hole (2) for ejecting water flow, and the water jet hole (2) is arranged close to the air jet slot (3) so as to be able to eject air flow and water mist toward the rod or wire separately or synchronously; The gas flow channel includes an air inlet channel (1), and the liquid flow channel includes a water inlet channel; the air inlet channel (1) is connected to at least one primary air cavity (4), the primary air cavity (4) is connected to a secondary air cavity (5), the secondary air cavity (5) is communicated with the air jet slit (3), and the primary air cavity (4) and the secondary air cavity (5) are separated by an air separator, the air separator is provided with an air permeable slit (9), and the primary air cavity (4) and the secondary air cavity (5) are communicated through and only through the air permeable slit (9); the water inlet channel is connected to a primary water cavity (10), the primary water cavity (10) is connected to a secondary water cavity (11), the secondary water cavity (11) is communicated with the water jet hole (2), and the primary water cavity (10) and the secondary water cavity (11) are separated by a water separator, and the primary water cavity (10) and the secondary water cavity (11) are communicated through and only through the water permeable slit on the water separator; The air inlet channel (1) and the water inlet channel are both arranged in a guide seat (6) having an annular sleeve (601) at intervals from each other and arranged in a direction parallel to the axial direction of the annular sleeve (601), the inlet end of the air inlet channel (1) is connected to an air supply pipe (15), and the inlet end of the water inlet channel is connected to a water supply pipe (16); It also includes a pair of pressure rings (14) that are detachable and coaxially mounted on the two ends of the annular sleeve (601). In the area between the two pressure rings (14) on the inner side of the annular sleeve (601), an annular core ring (13) is coaxially provided. The two areas formed between the core ring (13) and the two pressure rings (14) and the annular sleeve (601) are divided into a primary air cavity (4) and a secondary air cavity (5) by the gas separator. The part of the core ring (13) that is close to its own inner annular surface is located between the two pressure rings (14), and the annular gap formed with the two pressure rings (14) constitutes the air jet gap (3).

2. The compact variable ring-shaped nozzle for ultra-fast cooling of rods and wires according to claim 1 is characterized by: The core ring (13) is provided with a coaxial annular cavity in its ring wall. The annular cavity is divided into the primary water cavity (10) and the secondary water cavity (11) by the water dividing member. One end of the water spray hole (2) is connected to the secondary water cavity (11), and the other end extends to the inner annular surface and penetrates the inner annular surface.

3. The compact variable ring-shaped nozzle for ultra-fast cooling of rods and wires according to claim 2, characterized in that: The portion of the core ring (13) close to the inner annular surface is an annular ring, and the water spray hole (2) is arranged along the radial direction of the annular ring so that the two air jet slots (3) are arranged on both sides of the water spray hole (2).

4. The compact variable ring-shaped nozzle for ultra-fast cooling of rods and wires according to claim 3 is characterized by: The air separation member and the water separation member are both annular structures, so as to form an air separation ring (8) and a water separation ring (12) respectively provided with the air permeable slit (9) and the water permeable slit.

5. The compact variable ring-shaped nozzle for ultra-fast cooling of rods and wires according to claim 4, characterized in that: The air-permeable slit (9) and the water-permeable slit are both rectangular strip holes, the length direction of which is parallel to the axial direction of the air-dividing ring (8) and the water-dividing ring (12), and the water-dividing ring (12) is located directly above between the two air-dividing rings (8).

6. The compact variable ring-shaped nozzle for ultra-fast cooling of rods and wires according to claim 5, characterized in that: One end of the rectangular strip hole penetrates the end faces of the air dividing ring (8) and the water dividing ring (12) to form rectangular notches on the air dividing ring (8) and the water dividing ring (12), and the opening directions of two adjacent rectangular notches are opposite.

7. A rod and wire cooling process, characterized in that: The compact variable type rod and wire ultra-fast cooling annular nozzle as described in any one of claims 2 to 6 is used for cooling, and a plurality of the annular nozzles are evenly spaced and arranged in a straight line, the water supply pipe (16) is arranged on the outside of the air supply pipe (15), the water supply pipe (16) and the air supply pipe (15) are arranged along the axial direction of the guide seat (6), and are located on both sides of the guide seat (6), the water supply pipe (16) and the air supply pipe (15) are respectively connected to the corresponding water inlet channel and air inlet channel (1) through four conveying pipes (17), and a water supply pipe (16) and an air supply pipe (15) are provided on each side; when air and water are respectively introduced into the water supply pipe (16) and the air supply pipe (15), it is ensured that when the jet slit (3) and the water spray hole (2) spray the corresponding fluid at the same time, the droplet diameter of the mixed aerosol is greater than 60um.

Images