A cooling nozzle and a method for cooling a rolled piece

Abstract

The present invention discloses a cooling nozzle and a method for cooling a rolled piece. The cooling nozzle has a pressurizing channel, a spraying channel, a turbulent flow channel, a cooling channel, and a diverging channel that are sequentially connected in the direction of the cooling medium flow. The spraying channel converges towards the rolled piece in the direction of the rolled piece movement. The cross-sectional area of the pressurizing channel and the cross-sectional area of the turbulent flow channel are respectively larger than the cross-sectional area of the spraying channel. The cross-sectional area of the turbulent flow channel and the cross-sectional area of the diverging channel are respectively larger than the cross-sectional area of the cooling channel. At least one first injection port is connected to the spraying channel, and at least one second injection port is connected to the cooling channel. The cooling nozzle of the present invention can achieve multiple multi-directional cooling jet impacts to break the steam film on the surface of the high-temperature rolled piece, increase the contact cooling efficiency between the cooling medium and the rolled piece, enhance the cooling effect of the rolled piece, and effectively improve the comprehensive mechanical properties of the bar rolled piece.

Description

Technical Field

[0001] The present invention relates to a cooling nozzle and a method for cooling a rolled piece, and particularly to a cooling nozzle and a method for cooling a rolled piece applied to the cooling of bar or wire rod rolled pieces. Background Art

[0002] By using cooling water to rapidly cool and quench bar or wire rod rolled pieces, good material mechanical properties can be obtained for the rolled pieces. However, currently, when high-temperature bar or wire rod rolled pieces pass through cooling water, the cooling water will generate an expanding steam film on the surface of the high-temperature and hot rolled pieces. The existence of this steam film greatly affects the cooling effect of the cooling water. There are mainly two reasons for the generation of the steam film: one is that when 30°C cooling water meets a 900°C high-temperature rolled piece, water molecules absorb a large amount of heat and thus quickly turn into a gaseous state, causing a water vapor film to be rapidly formed on the surface of the rolled piece; the other is that the velocity difference between the high-speed running rolled piece and the cooling water flow will cause a gas film caused by the supercavitation effect to be generated on the surface of the rolled piece.

[0003] Existing cooling nozzles have a nozzle cone surface and an annular slit, and the nozzle cone surface and the annular slit form a spraying channel at a certain angle with the rolled piece. The cooling water passes through the spraying channel and sprays and impacts the surface of the rolled piece at a certain included angle at a high speed, thereby realizing the cooling of the rolled piece. By increasing the pressure and flow rate of the cooling water and reducing the spraying angle of the cooling nozzle, to a certain extent, it can play a role in destroying the steam film. However, in actual operation, this method still cannot completely break the steam film. Instead, due to the excessive impact force of the water flow kinetic energy, the rolled piece will move back and forth in the nozzle, resulting in uneven cooling of the rolled piece, poor internal structure, and even possible steel piling accidents. Summary of the Invention

[0004] An object of the present invention is to provide a cooling nozzle that utilizes the supercavitation phenomenon and the high-energy bubble cavitation effect to destroy the steam film and ensure sufficient heat exchange between the rolled piece and the cooling medium.

[0005] The above object of the present invention can be achieved by the following technical solutions:

[0006] The present invention provides a cooling nozzle that cools a moving rolled piece passing through its interior through a flowing cooling medium. The cooling nozzle has a pressurizing channel, a spraying channel, a turbulent flow channel, a cooling channel, and an expanding channel that are sequentially connected and arranged along the flowing direction of the cooling medium, wherein:

[0007] The spraying channel converges towards the rolled piece along the moving direction of the rolled piece;

[0008] The cross-sectional area of the pressurizing channel and the cross-sectional area of the turbulent flow channel are respectively larger than the cross-sectional area of the spraying channel;

[0009] The cross-sectional area of the turbulent channel and the cross-sectional area of the expansion channel are respectively larger than the cross-sectional area of the cooling channel;

[0010] At least one first injection port is in communication with the injection channel;

[0011] At least one second injection port is in communication with the cooling channel.

[0012] The cooling nozzle as described above, wherein the cooling nozzle has the pressurization channel, the injection channel, the water outlet channel, the contraction channel, the cooling channel, and the expansion channel that are sequentially in communication along the flow direction of the cooling medium, and the water outlet channel and the contraction channel form the turbulent channel.

[0013] The cooling nozzle as described above, wherein a predetermined injection angle is formed between the injection channel and the rolled piece, and the predetermined injection angle is between 10° and 20°.

[0014] The cooling nozzle as described above, wherein a predetermined contraction angle is formed between the generatrix of the conical structure of the contraction channel and the rolled piece, and the predetermined contraction angle is between 10° and 20°.

[0015] The cooling nozzle as described above, wherein a predetermined expansion angle is formed between the generatrix of the conical structure of the expansion channel and the rolled piece, and the predetermined expansion angle is between 10° and 20°.

[0016] The cooling nozzle as described above, wherein the magnitude of the predetermined expansion angle is the same as the magnitude of the predetermined contraction angle.

[0017] The cooling nozzle as described above, wherein the cooling nozzle includes:

[0018] Nozzle core;

[0019] Nozzle tube, the nozzle core and the nozzle tube are sequentially arranged along the movement direction of the rolled piece, one end of the nozzle tube close to the nozzle core is arranged around the nozzle core, the injection channel is formed between one end of the nozzle tube close to the nozzle core and the nozzle core, and the turbulent channel, the cooling channel, and the expansion channel are sequentially formed at the other end of the nozzle tube along the flow direction of the cooling medium;

[0020] Nozzle seat, which is fixedly sleeved on the nozzle core and the nozzle tube, the pressurization channel is formed between the nozzle seat and the nozzle core, the side wall of the nozzle seat has a pressurization port and at least one of the first injection ports, and the pressurization port is in communication with the pressurization channel.

[0021] The cooling nozzle as described above, wherein the cooling nozzle includes:

[0022] Nozzle core;

[0023] Nozzle head, the nozzle core and the nozzle head are arranged in sequence along the moving direction of the rolled piece, one end of the nozzle head close to the nozzle core is arranged around the nozzle core, and a spraying channel is formed between one end of the nozzle head close to the nozzle core and the nozzle core, and a water outlet channel is formed at one end of the nozzle head far from the nozzle core;

[0024] Nozzle seat, which is fixedly sleeved on the nozzle core and the nozzle head, a pressurizing channel is formed between the nozzle seat and the nozzle core, and a pressurizing port and at least one first injection port are arranged on the side wall of the nozzle seat, and the pressurizing port is communicated with the pressurizing channel;

[0025] Cooling pipe, the nozzle head and the cooling pipe are connected and arranged in sequence along the moving direction of the rolled piece, the cooling pipe is formed with a contraction channel, a cooling channel and an expansion channel in a penetrating manner along the moving direction of the rolled piece, and at least one second injection port is arranged on the side wall of the cooling pipe.

[0026] The cooling nozzle as described above, wherein the cooling pipe has a plurality of cooling sub-pipes arranged end to end along the moving direction of the rolled piece, and each of the plurality of cooling sub-pipes has the contraction channel, the cooling channel and the expansion channel.

[0027] The cooling nozzle as described above, which includes a nozzle sleeve sleeved on the cooling pipe, the nozzle sleeve is fixedly connected with the nozzle seat, and an injection hole communicated with the second injection port is arranged on the side wall of the nozzle sleeve.

[0028] The cooling nozzle as described above, which includes a nozzle cover covering the rear end of the cooling pipe, the nozzle cover is fixedly connected to the nozzle sleeve, and the nozzle cover can fix the cooling pipe in the nozzle sleeve.

[0029] Another object of the present invention is to provide a method for cooling a rolled piece, which uses the supercavitation phenomenon and the high-energy bubble cavitation effect to destroy the steam film and ensure full heat exchange between the rolled piece and the cooling medium.

[0030] The above object of the present invention can be achieved by the following technical solutions:

[0031] The present invention provides a method for cooling a rolled piece, which can cool the rolled piece in a cooling nozzle through a cooling medium. Among them, the cooling nozzle has a pressurizing channel, a spraying channel, a turbulent flow channel, a cooling channel and an expansion channel which are communicated in sequence along the flowing direction of the cooling medium. The cooling nozzle has a first injection port communicated with the spraying channel and a second injection port communicated with the cooling channel. The method for cooling the rolled piece includes:

[0032] The cooling medium enters the cooling nozzle from the pressurizing channel, and the cooling medium sequentially passes through the pressurizing channel, the injection channel, the turbulence channel, the cooling channel, and the expansion channel;

[0033] Auxiliary media are respectively injected into the injection channel and the cooling channel through the first injection port and the second injection port, and the cooling medium drives the auxiliary media and mixes with the auxiliary media;

[0034] The rolled piece passes through the cooling nozzle at a predetermined cooling speed, and the rolled piece contacts and passes through the cooling medium in the turbulence channel, the cooling channel, and the expansion channel.

[0035] The rolled piece cooling method as described above, wherein the first injection port releases the auxiliary medium at the entrance of the injection channel, and the cooling medium drives the auxiliary medium and mixes with the auxiliary medium in the injection channel.

[0036] The rolled piece cooling method as described above, wherein the second injection port releases the auxiliary medium in the middle section of the cooling channel, and the cooling medium drives the auxiliary medium and mixes with the auxiliary medium in the cooling channel.

[0037] The rolled piece cooling method as described above, wherein the predetermined cooling speed is the relative speed between the rolled piece and the cooling medium, and the predetermined cooling speed is greater than 51 m / s.

[0038] The features and advantages of the present invention are:

[0039] The cooling nozzle of the present invention and its rolled piece cooling method can achieve multiple multi-directional jet impacts such as high-pressure jet, supercavitating jet, and high-energy cavitating jet to break the steam film formed by the contact between the high-temperature rolled piece and the cooling medium. At the same time, by utilizing the turbulent state of the fluid, the contact area between the cooling medium and the rolled piece is increased, the cooling effect of the rolled piece is enhanced, the full heat exchange between the rolled piece and the cooling medium is ensured, and the comprehensive mechanical properties of the bar rolled piece are effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 It is a front view sectional schematic diagram of the structure of the cooling nozzle of the present invention.

[0042] Figure 2This is a front view cross-sectional schematic diagram of the cooling medium channel of the cooling nozzle of the present invention.

[0043] Figure 3 This is a front view cross-sectional schematic diagram of an embodiment of the cooling nozzle of the present invention.

[0044] Figure 4 This is a front view cross-sectional schematic diagram of another embodiment of the cooling nozzle of the present invention.

[0045] Figure 5 This is a front view cross-sectional schematic diagram of the cooling pipe of the cooling nozzle of the present invention.

[0046] Explanation of the reference numerals in the drawings

[0047] 11: Pressurizing channel 12: Injection channel

[0048] 13: Turbulence channel 131: Water outlet channel

[0049] 132: Contraction channel 14: Cooling channel

[0050] 15: Expansion channel 21: First injection port

[0051] 22: Second injection port 23: Injection hole

[0052] 31: Nozzle core 32: Nozzle seat

[0053] 33: Nozzle pipe 331: Nozzle head

[0054] 332: Cooling pipe 3321: Cooling branch pipe

[0055] 3322: Cooling branch pipe 3323: Cooling branch pipe

[0056] 5: Nozzle sleeve 6: Nozzle cap

[0057] 7: Rolled piece 8: Pressurizing port

[0058] A: Predetermined injection angle B: Predetermined contraction angle

[0059] C: Predetermined expansion angle G: Auxiliary medium

[0060] L: Cooling medium M: Movement direction of the rolled piece

[0061] N: Flow direction of the cooling medium Detailed implementation manners

[0062] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there may also be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a middle element at the same time. The terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the communication inside two elements. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation mode.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of this application herein are only for the purpose of describing specific implementation modes and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0064] Embodiment 1:

[0065] Please refer to Figures 1 to 3 As shown, the cooling nozzle of the present invention cools the moving rolled piece 7 passing through its interior through the flowing cooling medium L. The cooling nozzle of the present invention has a pressurizing channel 11, a spraying channel 12, a turbulent flow channel 13, a cooling channel 14, and a diverging channel 15 that are sequentially connected and arranged along the flowing direction N of the cooling medium, wherein: the spraying channel 12 converges towards the rolled piece 7 along the moving direction M of the rolled piece; the cross-sectional area of the pressurizing channel 11 and the cross-sectional area of the turbulent flow channel 13 are respectively larger than the cross-sectional area of the spraying channel 12; the cross-sectional area of the turbulent flow channel 13 and the cross-sectional area of the diverging channel 15 are respectively larger than the cross-sectional area of the cooling channel 14; at least one first injection port 21 is connected to the spraying channel 12; at least one second injection port 22 is connected to the cooling channel 14.

[0066] The cooling nozzle of the present invention can break the steam film formed by the contact between the high-temperature rolled piece 7 and the cooling medium L, thereby increasing the contact area between the cooling medium L and the rolled piece 7, ensuring sufficient heat exchange between the rolled piece 7 and the cooling medium L, enhancing the cooling effect of the rolled piece 7, and effectively improving the comprehensive mechanical properties of the rolled piece 7. The high-pressure cooling medium L continuously enters the cooling nozzle of the present invention through the pressure port 8, flows through and fills the pressure channel 11, the injection channel 12, the turbulent channel 13, the cooling channel 14, and the expansion channel 15 in sequence, and flows out of the cooling nozzle of the present invention from the end of the expansion channel 15. When the rolled piece 7 passes through the cooling nozzle of the present invention, the high-temperature rolled piece 7 contacts the normal-temperature cooling medium L, causing the rolled piece 7 to be cooled by the cooling medium L. However, due to the large temperature difference, a steam film will be generated, which will affect the cooling effect. When the cooling medium L passes through the injection channel 12, since the cross-sectional area of the injection channel 12 is significantly smaller than that of the pressure channel 11, the flow rate of the cooling medium L will be greatly increased to form a high-speed jet. And the injection channel 12 converges towards the rolled piece 7 along the moving direction M of the rolled piece, so that the high-speed jet formed by the cooling medium L can impact the rolled piece 7 at a small angle, producing a destructive effect on the steam film on the surface of the rolled piece 7.

[0067] When the cooling medium L flows from the pressure channel 11 with a larger cross-sectional area into the injection channel 12 with a smaller cross-sectional area, the pressure of the cooling medium L decreases due to the increase in flow rate. At this time, by injecting the auxiliary medium G into the injection channel 12 through the first injection port 21, a large number of bubbles can be formed in the cooling medium L, and these bubbles are not easily broken in the injection channel 12 with a smaller pressure, and follow the cooling medium L into the turbulent channel 13. When the cooling medium L flows from the injection channel 12 with a smaller cross-sectional area into the turbulent channel 13 with a larger cross-sectional area and contacts the rolled piece 7, the pressure of the cooling medium L increases due to the decrease in flow rate, and then these bubbles are squeezed and broken by the larger pressure to generate an impact, and this impact can also effectively break the steam film on the surface of the rolled piece 7. Similarly, when the cooling medium L flows from the turbulent channel 13 with a larger cross-sectional area into the cooling channel 14 with a smaller cross-sectional area and then flows into the expansion channel 15 with a larger cross-sectional area again, by injecting the auxiliary medium G into the cooling channel 14 through the second injection port 22, the steam film on the surface of the rolled piece 7 can also be effectively broken. In addition, in the turbulent channel 13 with a larger cross-sectional area and the expansion channel 15 with a larger cross-sectional area, the cooling medium L has a larger fluid pressure, and this larger pressure will make the flow state of the fluid unstable, so that the cooling medium L presents a turbulent state, and the cooling medium L relatively far away from the rolled piece 7 in the radial direction will also move to the vicinity of the rolled piece 7, thereby increasing the contact area between the cooling medium L and the rolled piece 7 and enhancing the cooling effect on the rolled piece 7.

[0068] Specifically, the cooling medium L can be common industrial cooling water, the rolled piece 7 can be an industrial bar or wire rolled piece, the pressurizing channel 11 is a cavity capable of withstanding a certain pressure so that the cooling medium L has sufficient impact pressure, the injection channel 12 is an annular gap capable of withstanding a certain pressure so that the cooling medium L obtains sufficient flow velocity in the injection channel 12, the turbulent flow channel 13 is a cavity with a relatively large cross-sectional area so that the cooling medium L generates a turbulent state, the cooling channel 14 is a through hole with a constant cross-sectional area so that the rolled piece 7 can pass through the cooling channel 14 smoothly, the expansion channel 15 is a cavity with a relatively large cross-sectional area so that the cooling medium L generates a turbulent state again, the first injection port 21 and the second injection port 22 can be integrally formed on the outer wall of the cooling nozzle or be separate pipelines passing through the outer wall of the cooling nozzle, and the auxiliary medium G can be compressed air.

[0069] In this embodiment, the cooling nozzle of the present invention includes a nozzle core 31, a nozzle tube 33 and a nozzle seat 32, wherein: the nozzle core 31 and the nozzle tube 33 are arranged in sequence along the moving direction of the rolled piece, one end of the nozzle tube 33 close to the nozzle core 31 is arranged around the nozzle core 31, an injection channel 12 is formed between one end of the nozzle tube 33 close to the nozzle core 31 and the nozzle core 31, and a turbulent flow channel 13, the cooling channel 14 and an expansion channel 15 are sequentially formed at one end of the nozzle tube 33 far from the nozzle core 31 along the flowing direction N of the cooling medium; the nozzle seat 32 is fixedly sleeved on the nozzle core 31 and the nozzle tube 33, a pressurizing channel 11 is formed between the nozzle seat 32 and the nozzle core 31, a pressurizing port 8 and at least one first injection port 21 are provided on the side wall of the nozzle seat 32, and the pressurizing port 8 is communicated with the pressurizing channel 11.

[0070] By fixedly connecting the nozzle core 31, the nozzle tube 33 and the nozzle seat 32 to form the pressurizing channel 11, the injection channel 12, the turbulent flow channel 13, the cooling channel 14 and the expansion channel 15, it can be ensured that each channel can well withstand the pressure of the cooling medium L, and the manufacturing process of the cooling nozzle of the present invention can be simplified, and the manufacturing cost can be reduced. Specifically, one end of the nozzle core 31 far from the nozzle tube 33 is of a flange plate structure to be fixedly connected with one end face of the annular nozzle seat 32, and the outer peripheral surface of one end of the nozzle core 31 close to the nozzle tube 33 has a conical structure to cooperate with the inner peripheral surface of the conical structure formed at one end of the nozzle tube 33 close to the nozzle core 31 to form the injection channel 12. The turbulent flow channel 13, the cooling channel 14 and the expansion channel 15 are integrally formed at one end of the nozzle tube 33 far from the nozzle core 31, or the nozzle tube 33 can be composed of different parts.

[0071] In this embodiment, the cooling nozzle of the present invention has a pressurizing channel 11, a spraying channel 12, a water outlet channel 131, a contraction channel 132, a cooling channel 14, and an expansion channel 15 that are connected in sequence along the flow direction of the cooling medium. The water outlet channel 131 and the contraction channel 132 form a turbulent flow channel 13. Splitting the turbulent flow channel 13 into the water outlet channel 131 and the contraction channel 132 can ensure that the cooling medium L presents a turbulent state in the turbulent flow channel 13, while reducing the difficulty of forming the cavity of the turbulent flow channel 13 and saving the manufacturing cost of the cooling nozzle of the present invention. Specifically, the cross-sectional area of the water outlet channel 131 first decreases and then increases. The contraction channel 132 has a tapered structure that gradually converges along the moving direction M of the rolled piece, and the expansion channel 15 has a tapered structure that gradually expands along the moving direction M of the rolled piece.

[0072] In this embodiment, the cooling nozzle of the present invention has a nozzle core, a nozzle head, a nozzle seat, and a cooling pipe, wherein: the nozzle core 31 and the nozzle head 331 are arranged in sequence along the moving direction of the rolled piece. One end of the nozzle head 331 close to the nozzle core 31 is arranged around the nozzle core 31. A spraying channel 12 is formed between one end of the nozzle head 331 close to the nozzle core 31 and the nozzle core 31. The water outlet channel 131 is formed at the end of the nozzle head 331 far from the nozzle core 31; the nozzle seat 32 is fixedly sleeved on the nozzle core 31 and the nozzle head 331. A pressurizing channel 11 is formed between the nozzle seat 32 and the nozzle core 31. A pressurizing port 8 and at least one first injection port 21 are provided on the side wall of the nozzle seat 32. The pressurizing port 8 is communicated with the pressurizing channel 11; the nozzle head 331 and the cooling pipe 332 are connected and arranged in sequence along the moving direction of the rolled piece. The cooling pipe 332 is formed with a contraction channel 132, a cooling channel 14, and an expansion channel 15 that penetrate along the moving direction of the rolled piece. At least one second injection port 22 is provided on the side wall of the cooling pipe 332.

[0073] By fixedly connecting the nozzle core 31, the nozzle head 331, the nozzle seat 32, and the cooling pipe 332 to form the pressurizing channel 11, the spraying channel 12, the water outlet channel 131, the contraction channel 132, the cooling channel 14, and the expansion channel 15, it can be ensured that each channel can well withstand the pressure of the cooling medium L, and the manufacturing process of the cooling nozzle of the present invention is simplified, and the manufacturing cost is reduced. Specifically, one end of the nozzle core 31 far from the nozzle pipe 33 has a flange structure to be fixedly connected to one end face of the annular nozzle seat 32. The outer peripheral surface of one end of the nozzle core 31 close to the nozzle pipe 33 has a tapered structure to cooperate with the inner peripheral surface of the tapered structure formed at one end of the nozzle pipe 33 close to the nozzle core 31 to form the spraying channel 12. The water outlet channel 131 is formed at the end of the nozzle pipe 33 far from the nozzle core 31. The cooling pipe 332 can be an integral tubular structure or a multi-section combined tubular structure.

[0074] Please refer to Figure 4As shown, in a feasible embodiment, the cooling tube 332 of the cooling nozzle of the present invention has a plurality of cooling sub-tubes arranged end to end along the moving direction of the rolled piece, such as cooling sub-tube 3321, cooling sub-tube 3322, cooling sub-tube 3323, etc. Each of the plurality of cooling sub-tubes has the contraction channel, the cooling channel, and the expansion channel. Thus, multiple groups of identical cooling structures with the contraction channel 132, the cooling channel 14, and the expansion channel 15 can be formed, increasing the cooling stroke of the rolled piece 7 and improving the cooling effect. It can also enable the cooling tube 332 to be simply changed in length according to actual needs, simplify the manufacturing process of the cooling tube 332, and reduce the manufacturing cost. Specifically, multiple cooling sub-tubes such as cooling sub-tube 3321, cooling sub-tube 3322, cooling sub-tube 3323, etc. can be connected into a whole by welding, or can be placed in a fixed structure together without rigid connection between them, and combined to form the cooling tube 332.

[0075] In this embodiment, the cooling nozzle of the present invention includes a nozzle sleeve 5 sleeved on the cooling tube 332 and a nozzle cap 6 covering the rear end of the cooling tube 332, where: the nozzle sleeve 5 is fixedly connected to the nozzle seat 32, and the side wall of the nozzle sleeve 5 has an injection hole 23 communicating with the second injection port 22; the nozzle cap 6 is fixedly connected to the nozzle sleeve 5, and the nozzle cap 6 can fix the cooling tube 332 in the nozzle sleeve 5. Through the nozzle sleeve 5 and the nozzle cap 6, the cooling tube 332 can be conveniently fixed and connected to the nozzle head 331. After the length of the cooling tube 332 is changed according to actual needs, only the nozzle sleeve 5 with the corresponding length needs to be replaced and matched with the nozzle cap 6 to fix the cooling tube 332 again, thereby simplifying the manufacturing process and operation difficulty of the connection between the cooling tube 332 and the nozzle head 331, reducing the manufacturing cost, and improving the use convenience. Specifically, both ends of the cooling tube 332 have a flange structure to fixedly connect the two ends to the nozzle seat 32 and the nozzle cap 6 respectively, and the nozzle cap 6 has a tapered through hole tangent to the expansion channel 15.

[0076] Please refer to Figure 5 As shown, in this embodiment, a predetermined injection angle A is formed between the injection channel 12 of the cooling nozzle of the present invention and the rolled piece 7, and the predetermined injection angle A is between 10° and 20°. The predetermined injection angle A being between 10° and 20° can make the cooling medium L approach the rolled piece 7 approximately tangentially, so that the jet flow generated by the cooling medium L is more likely to break through the steam film on the surface of the rolled piece 7, enhancing the cooling effect of the rolled piece 7. Specifically, the predetermined injection angle A is preferably 15 degrees.

[0077] In this embodiment, a predetermined contraction angle B is formed between the generatrix of the contraction channel 132 provided in the conical structure of the cooling nozzle of the present invention and the rolled piece 7, and the predetermined contraction angle B is between 10° and 20°. The predetermined contraction angle B being between 10° and 20° can make the cooling medium L more likely to form and maintain a turbulent state in the contraction channel 132, thereby increasing the contact area between the cooling medium L and the rolled piece 7 and enhancing the cooling effect of the rolled piece 7. Specifically, the predetermined contraction angle B is preferably 15 degrees.

[0078] In this embodiment, a predetermined expansion angle C is formed between the generatrix of the expansion channel 15 provided in the conical structure of the cooling nozzle of the present invention and the rolled piece 7, and the predetermined expansion angle C is between 10° and 20°. The predetermined expansion angle C being between 10° and 20° can make the cooling medium L more likely to form and maintain a turbulent state in the expansion channel 15, thereby increasing the contact area between the cooling medium L and the rolled piece 7 and enhancing the cooling effect of the rolled piece 7. Specifically, the predetermined expansion angle C is preferably 15 degrees.

[0079] In this embodiment, the magnitude of the predetermined expansion angle C of the cooling nozzle of the present invention is the same as the magnitude of the predetermined contraction angle B. The magnitudes of the predetermined expansion angle C and the predetermined contraction angle B being the same can simplify the forming and manufacturing processes of the contraction channel 132 and the expansion channel 15, reduce the manufacturing cost, and make the cooling medium L form an approximate turbulent state in the contraction channel 132 and the expansion channel 15, so that the rolled piece 7 passes through the contraction channel 132 and the expansion channel 15 more smoothly. Specifically, both the predetermined expansion angle C and the predetermined contraction angle B are preferably 15 degrees.

[0080] Embodiment 2:

[0081] The rolled piece cooling method of the present invention is applied to a cooling nozzle, and the specific structure of the cooling nozzle is the same as the aforementioned cooling nozzle. The rolled piece cooling method of the present invention includes: the cooling medium L enters the cooling nozzle of the present invention from the pressurization channel 11, and the cooling medium L sequentially passes through the pressurization channel 11, the injection channel 12, the turbulent channel 13, the cooling channel 14, and the expansion channel 15; auxiliary medium G is injected into the injection channel 12 and the cooling channel 14 through the first injection port 21 and the second injection port 22 respectively, and the cooling medium L drives and mixes with the auxiliary medium G; the rolled piece 7 passes through the cooling nozzle of the present invention at a predetermined cooling speed, and the rolled piece 7 contacts and passes through the cooling medium L in the turbulent channel 13, the cooling channel 14, and the expansion channel 15.

[0082] The rolling piece cooling method of the present invention can break the steam film formed by the contact between the high-temperature rolling piece 7 and the cooling medium L, thereby increasing the contact area between the cooling medium L and the rolling piece 7, ensuring sufficient heat exchange between the rolling piece 7 and the cooling medium L, enhancing the cooling effect of the rolling piece 7, and effectively improving the comprehensive mechanical properties of the rolling piece 7. The high-pressure cooling medium L continuously enters the cooling nozzle of the present invention through the pressurizing port 8, flows and successively passes through and fills the pressurizing channel 11, the injection channel 12, the turbulent channel 13, the cooling channel 14, and the expansion channel 15, and flows out of the cooling nozzle of the present invention from the end of the expansion channel 15. When the rolling piece 7 passes through the cooling nozzle of the present invention, the high-temperature rolling piece 7 contacts the normal-temperature cooling medium L, causing the rolling piece 7 to be cooled by the cooling medium L. However, a steam film will also be generated due to the large temperature difference, which will affect the cooling effect. When the cooling medium L flows from the pressurizing channel 11 with a larger cross-sectional area into the injection channel 12 with a smaller cross-sectional area, the pressure of the cooling medium L decreases due to the increase in flow velocity. At this time, by injecting the auxiliary medium G into the injection channel 12 through the first injection port 21, a large number of bubbles can be formed in the cooling medium L, and these bubbles are not easily broken in the injection channel 12 with a smaller pressure, and follow the cooling medium L into the turbulent channel 13. When the cooling medium L flows from the injection channel 12 with a smaller cross-sectional area into the turbulent channel 13 with a larger cross-sectional area and contacts the rolling piece 7, the pressure of the cooling medium L increases due to the decrease in flow velocity, and then these bubbles are squeezed and broken by the larger pressure to generate an impact, and this impact can also effectively break the steam film on the surface of the rolling piece 7. Similarly, when the cooling medium L flows from the turbulent channel 13 with a larger cross-sectional area into the cooling channel 14 with a smaller cross-sectional area and then flows into the expansion channel 15 with a larger cross-sectional area again, by injecting the auxiliary medium G into the cooling channel 14 through the second injection port 22, the steam film on the surface of the rolling piece 7 can also be effectively broken. After the speed of the rolling piece 7 increases, the flow velocity of the cooling medium L relatively close to the rolling piece 7 in the radial direction will be driven to increase by the rolling piece 7, and the increase in flow velocity is accompanied by a decrease in the pressure of the cooling medium L near the rolling piece 7. When this speed reaches the predetermined cooling speed, the pressure of the cooling medium L near the rolling piece 7 drops below the standard vapor pressure, causing part of the cooling medium L to become gaseous and generate bubbles. When these bubbles encounter the cooling medium L with a normal pressure relatively far from the rolling piece 7 in the radial direction, these bubbles will be squeezed and broken to generate an impact, and this impact will also effectively break the steam film on the surface of the rolling piece 7.

[0083] Specifically, the cooling medium L can be common industrial cooling water, the rolling piece 7 is an industrial bar or wire rolling piece, the first injection port 21 and the second injection port 22 can be integrally formed on the outer wall of the cooling nozzle, or can be separate pipelines passing through the outer wall of the cooling nozzle, and the auxiliary medium G can be compressed air.

[0084] In this embodiment, the predetermined cooling rate is the relative speed between the rolled piece 7 and the cooling medium L, and the predetermined cooling rate is greater than 51 m / s. When the rolled piece 7 runs at the predetermined cooling rate, the above-mentioned film-breaking effect on the steam film on the surface of the rolled piece 7 will be generated, improving the cooling effect of the rolled piece 7. Specifically, the predetermined cooling rate is preferably 55 m / s.

[0085] In this embodiment, the first injection port 21 of the rolled piece cooling method of the present invention releases the auxiliary medium G at the inlet of the injection channel 12, and the cooling medium L drives the auxiliary medium G and mixes with the auxiliary medium G in the injection channel 12. Releasing the auxiliary medium G at the inlet of the injection channel 12 can prevent the bubbles generated by the auxiliary medium G from collapsing prematurely in the pressurization channel 11 with a relatively large liquid pressure, so as to ensure that the bubbles generated by the auxiliary medium G smoothly enter the injection channel 12 and generate the above-mentioned film-breaking effect on the steam film on the surface of the rolled piece 7, improving the cooling effect of the rolled piece 7. Specifically, the first injection port 21 can extend from the outer wall of the cooling nozzle to the inlet of the injection channel 12, so that the auxiliary medium G can be more easily brought into the injection channel 12 by the cooling medium L.

[0086] In this embodiment, the second injection port 22 of the rolled piece cooling method of the present invention releases the auxiliary medium G in the middle section of the cooling channel 14, and the cooling medium L drives the auxiliary medium G and mixes with the auxiliary medium G in the cooling channel 14. Releasing the auxiliary medium G in the middle section of the cooling channel 14 can prevent the bubbles generated by the auxiliary medium G from collapsing prematurely in the turbulent channel 13 with a relatively large liquid pressure, so as to ensure that the bubbles generated by the auxiliary medium G smoothly enter the cooling channel 14 and generate the above-mentioned film-breaking effect on the steam film on the surface of the rolled piece 7, improving the cooling effect of the rolled piece 7. Specifically, the second injection port 22 can be perpendicular to the rolled piece 7, so that the auxiliary medium G can be naturally brought into the cooling channel 14 by the cooling medium L.

[0087] The above are only several embodiments of the present invention. Those skilled in the art can make various changes or modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention according to the content disclosed in the application documents.

Claims

1. A cooling nozzle that cools a moving rolled piece passing through its interior by a flowing cooling medium, characterized in that, the cooling nozzle has a pressurizing channel, a spraying channel, a turbulence channel, a cooling channel, and a diverging channel that are sequentially connected and arranged along the flowing direction of the cooling medium, wherein: the spraying channel converges towards the rolled piece along the moving direction of the rolled piece; the cross-sectional area of the pressurizing channel and the cross-sectional area of the turbulence channel are respectively larger than the cross-sectional area of the spraying channel; the cross-sectional area of the turbulence channel and the cross-sectional area of the diverging channel are respectively larger than the cross-sectional area of the cooling channel; at least one first injection port is connected to the spraying channel; at least one second injection port is connected to the cooling channel.

2. The cooling nozzle according to claim 1, characterized in that, the cooling nozzle has the pressurizing channel, the spraying channel, a water outlet channel, a constricting channel, the cooling channel, and the diverging channel that are sequentially connected and arranged along the flowing direction of the cooling medium, and the water outlet channel and the constricting channel form the turbulence channel.

3. The cooling nozzle according to claim 1 or 2, characterized in that, a predetermined spraying angle is formed between the spraying channel and the rolled piece, and the predetermined spraying angle is between 10° and 20°.

4. The cooling nozzle according to claim 2, characterized in that, a predetermined constricting angle is formed between the generatrix of the constricting channel arranged in a conical structure and the rolled piece, and the predetermined constricting angle is between 10° and 20°.

5. The cooling nozzle according to claim 1 or 2, characterized in that, a predetermined diverging angle is formed between the generatrix of the diverging channel arranged in a conical structure and the rolled piece, and the predetermined diverging angle is between 10° and 20°.

6. The cooling nozzle according to claim 2, characterized in that, a predetermined constricting angle is formed between the generatrix of the constricting channel arranged in a conical structure and the rolled piece, a predetermined diverging angle is formed between the generatrix of the diverging channel arranged in a conical structure and the rolled piece, and the magnitude of the predetermined diverging angle is the same as the magnitude of the predetermined constricting angle.

7. The cooling nozzle according to claim 1, characterized in that, the cooling nozzle includes: a nozzle core; a nozzle tube, the nozzle core and the nozzle tube are sequentially arranged along the moving direction of the rolled piece, one end of the nozzle tube close to the nozzle core is arranged around the nozzle core, the spraying channel is formed between one end of the nozzle tube close to the nozzle core and the nozzle core, and the turbulence channel, the cooling channel, and the diverging channel are sequentially formed at one end of the nozzle tube far from the nozzle core along the flowing direction of the cooling medium; a nozzle seat, which is fixedly sleeved on the nozzle core and the nozzle tube, the pressurizing channel is formed between the nozzle seat and the nozzle core, a pressurizing port and at least one of the first injection ports are provided on the side wall of the nozzle seat, and the pressurizing port is communicated with the pressurizing channel.

8. The cooling nozzle according to claim 2, characterized in that, the cooling nozzle includes: a nozzle core; Nozzle head, the nozzle core and the nozzle head are arranged in sequence along the moving direction of the rolled piece. One end of the nozzle head close to the nozzle core is arranged around the nozzle core. An injection channel is formed between one end of the nozzle head close to the nozzle core and the nozzle core. An outlet channel is formed at the end of the nozzle head far from the nozzle core. Nozzle seat, which is fixedly sleeved on the nozzle core and the nozzle head. A pressurization channel is formed between the nozzle seat and the nozzle core. The side wall of the nozzle seat is provided with a pressurization port and at least one first injection port. The pressurization port is communicated with the pressurization channel. Cooling pipe, the nozzle head and the cooling pipe are connected and arranged in sequence along the moving direction of the rolled piece. The cooling pipe is formed with a contraction channel, a cooling channel and an expansion channel through it along the moving direction of the rolled piece. The side wall of the cooling pipe is provided with at least one second injection port.

9. The cooling nozzle according to claim 8, characterized in that the cooling pipe has a plurality of cooling sub-pipes arranged end to end along the moving direction of the rolled piece, and each of the plurality of cooling sub-pipes has the contraction channel, the cooling channel and the expansion channel.

10. The cooling nozzle according to claim 8 or 9, characterized in that it includes a nozzle sleeve sleeved on the cooling pipe. The nozzle sleeve is fixedly connected to the nozzle seat. The side wall of the nozzle sleeve is provided with an injection hole communicated with the second injection port.

11. The cooling nozzle according to claim 10, characterized in that it includes a nozzle cap covering the rear end of the cooling pipe. The nozzle cap is fixedly connected to the nozzle sleeve. The nozzle cap can fix the cooling pipe in the nozzle sleeve.

12. A method for cooling a rolled piece, which can cool the rolled piece in a cooling nozzle through a cooling medium, characterized in that the cooling nozzle has a pressurization channel, an injection channel, a turbulence channel, a cooling channel and an expansion channel which are communicated in sequence along the flowing direction of the cooling medium. The cooling nozzle has a first injection port communicated with the injection channel and a second injection port communicated with the cooling channel. The method for cooling the rolled piece includes: the cooling medium enters the cooling nozzle from the pressurization channel, and the cooling medium sequentially passes through the pressurization channel, the injection channel, the turbulence channel, the cooling channel and the expansion channel; injecting an auxiliary medium into the injection channel and the cooling channel respectively through the first injection port and the second injection port. The cooling medium drives the auxiliary medium and mixes with the auxiliary medium; the rolled piece passes through the cooling nozzle at a predetermined cooling speed, and the rolled piece contacts and passes through the cooling medium in the turbulence channel, the cooling channel and the expansion channel.

13. The method for cooling a rolled piece according to claim 12, characterized in that the first injection port releases the auxiliary medium at the inlet of the injection channel. The cooling medium drives the auxiliary medium and mixes with the auxiliary medium in the injection channel.

14. The method for cooling a rolled piece according to claim 12, characterized in that The second injection port releases the auxiliary medium in the middle section of the cooling channel, and the cooling medium drives the auxiliary medium and mixes with the auxiliary medium in the cooling channel.

15. The method for cooling a rolled piece according to claim 12, wherein, the predetermined cooling speed is the relative speed between the rolled piece and the cooling medium, and the predetermined cooling speed is greater than 51 m / s.

Images