A descaling nozzle and a descaling lance

Abstract

The present application relates to a kind of descaling spray head and descaling nozzle, and the descaling spray head includes spray head, and the spray head is provided with transverse through groove at the end of injection, and nozzle is arranged at the center of groove;Cavity is opened in the middle of spray head and is connected with nozzle;The cross-sectional profile of the groove is conic curve;The cavity in the middle of spray head is composed of fast contraction section and water flow stabilization section, wherein fast contraction section is arranged close to the end of nozzle;Nozzle is curved surface opening formed after fast contraction section intersects with groove.This descaling spray head can efficiently convert the pressure energy of water flow into kinetic energy, compared with traditional descaling spray head, has better dynamic performance, improves the efficiency of on-site descaling, while saving water resources.

Description

TECHNICAL FIELD

[0001] The present application relates to a liquid nozzle, in particular to a descaling nozzle and a descaling nozzle. BACKGROUND

[0002] Steel is oxidized at high temperature, and a dense layer of iron oxide scale (i.e. scale) is formed on the surface. If the layer of iron oxide scale is not removed before rolling, it will be pressed into the surface of the strip during rolling, affecting the surface quality of the strip. In addition, the remaining iron oxide scale will also accelerate the wear of the roll, reducing the service life of the roll. When the strip needs to be pickled, the remaining iron oxide scale will also increase the difficulty of pickling and increase the acid consumption. Therefore, the surface of the billet must be removed before rolling.

[0003] The mechanical impact force of high-pressure water is used to remove the iron oxide scale (i.e. high-pressure water descaling), which is the most commonly used and effective method at present. In the high-pressure water descaling system, high-pressure water generated by the high-pressure water pump enters the nozzle, and under the action of the nozzle, the high-pressure water forms a fan-shaped water beam with a large impact force, which is sprayed onto the surface of the billet (or intermediate billet). Under the action of the high-pressure fan-shaped water jet, the iron oxide scale undergoes the process of being cut, rapidly cooled and shrunk, peeled off from the base material, washed and separated from the surface of the billet (or intermediate billet), thereby removing the iron oxide scale completely.

[0004] The nozzle part of the nozzle not only has a converging and accelerating effect on the water flow, but also determines the shape and angle of the jet, directly affecting the performance, energy consumption and efficiency of the high-pressure water descaling system. With the traditional descaling nozzle, a larger high-pressure water inlet pressure is required to meet the descaling requirements, i.e. the efficiency of converting pressure energy into kinetic energy is not high. SUMMARY

[0005] The present application provides a descaling nozzle which can efficiently convert the pressure energy of the water flow into kinetic energy, has better kinetic performance compared with the traditional descaling nozzle, improves the descaling efficiency on site while saving water resources, and simultaneously provides a descaling nozzle using the descaling nozzle.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] A descaling nozzle, comprising a nozzle, one end of the nozzle being a jet end and the other end being a connecting end connected to the nozzle body; the nozzle is provided with a transversely-through groove at the jet end, and a nozzle opening is arranged at the center of the groove; a cavity is formed in the middle of the nozzle and connected to the nozzle opening; the cross-sectional profile of the groove is a conic curve; the cavity in the middle of the nozzle is composed of a rapid converging section and a water flow stabilizing section, wherein the rapid converging section is arranged near one end of the nozzle opening; the nozzle opening is a curved opening formed after the rapid converging section intersects with the groove.

[0008] Further, the water flow stabilizing section is a circular hole structure.

[0009] Further, the rapid contraction section is a conical hole structure that contracts toward the nozzle end.

[0010] Further, the conic curve is an axisymmetric curve, and in a Cartesian coordinate system, along the positive direction of the longitudinal axis, the conic curve shape function is as follows:

[0011] y = -ax b

[0012] In the formula: y is the longitudinal coordinate of any point P on the conic curve;

[0013] X is the transverse coordinate of any point P on the conic curve;

[0014] a and b are constants that vary with the conic curve shape factor, and the relationship between a, b and the conic curve shape factor is as follows:

[0015] a = 0.57169C + 0.72136C 2 + 0.12473

[0016] b = -3.7116C + 1.29524C 2 + 3.52504

[0017] In the formula: C is the conic curve shape factor, and 0 < the conic curve shape factor C < 1.

[0018] Further, the conic curve shape factor C is 0.75-0.9.

[0019] Further, the material of the nozzle is tungsten carbide.

[0020] A descaling nozzle comprising the descaling nozzle.

[0021] Compared with the prior art, the beneficial effects of the present application are:

[0022] 1) The descaling nozzle can efficiently convert the pressure energy of the water flow into kinetic energy, and has better kinetic performance compared with the traditional descaling nozzle, thereby improving the on-site descaling efficiency and saving water resources;

[0023] 2) The descaling nozzle has a simple structure and can replace the traditional descaling nozzle for use in a descaling nozzle, and has strong applicability. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and the illustrative embodiments of the present application and their description are used to explain the present application, and do not constitute an improper limitation of the present application. In the drawings:

[0025] Figure 1is a schematic diagram of a three-dimensional structure of the descaling spray head according to an embodiment of the present application.

[0026] Figure 2 is a right view of Figure 1

[0027] Figure 3 is a sectional view of the descaling spray head according to an embodiment of the present application.

[0028] Figure 4 is a sectional view of the descaling spray head according to an embodiment of the present application.

[0029] Figure 5 is a graph of the outlet average velocity changing with the conic curve shape factor according to an embodiment of the present application.

[0030] Figure 6 is a graph of the outlet flow and outlet area changing with the conic curve shape factor according to an embodiment of the present application.

[0031] BRIEF DESCRIPTION OF DRAWINGS

[0032] In the figure: 1. fast converging section 2. water flow stabilizing section 3. spray opening 4. groove 5. clamping slot 6. spray head 7. second converging section 8. first converging section 9. flow stabilizer 10. filter DETAILED DESCRIPTION

[0033] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0035] The specific embodiments of the present application will be further described below in conjunction with the accompanying drawings:

[0036] As Figures 1-3 ​As shown, the descaling nozzle comprises a nozzle 6, one end of the nozzle 6 is a spraying end, the other end is a connecting end connected with a nozzle body; the nozzle 6 is provided with a transversely-through groove 4 at the spraying end, a nozzle opening 3 is arranged at the center of the groove 4; a cavity is arranged in the middle of the nozzle 6 and connected with the nozzle opening 3; the cross section profile of the groove 4 is a conic curve; the cavity in the middle of the nozzle 6 is composed of a rapid contraction section 1 and a water flow stabilizing section 2, wherein the rapid contraction section 1 is arranged close to one end of the nozzle opening 3; the nozzle opening 3 is a curved surface opening formed after the rapid contraction section 1 intersects with the groove 4.

[0037] Further, the water flow stabilizing section 2 is a circular hole structure.

[0038] Further, the rapid contraction section 1 is a conic hole structure which is contracted towards one end of the nozzle opening 3.

[0039] Further, the conic curve is an axisymmetric curve, in the Cartesian coordinate system along the positive direction of the longitudinal axis, the shape function of the conic curve is as follows:

[0040] y = -ax b

[0041] In the formula: y is the longitudinal coordinate of any point P on the conic curve;

[0042] X is the transverse coordinate of any point P on the conic curve;

[0043] a and b are constants which vary with the conic curve shape factor, the relationship between a, b and the conic curve shape factor is as follows:

[0044] a = 0.57169C + 0.72136C 2 + 0.12473

[0045] b = -3.7116C + 1.29524C 2 + 3.52504

[0046] In the formula: C is the conic curve shape factor, 0 < the conic curve shape factor C < 1.

[0047] Further, the conic curve shape factor C is 0.75-0.9.

[0048] Further, the material of the nozzle 6 is tungsten carbide.

[0049] The descaling nozzle comprises the descaling nozzle.

[0050] The water flow channel in the descaling nozzle 6 comprises a water flow stabilizing section 2, a rapid contraction section 1 and a nozzle 3. The high-pressure turbid water after being pressurized by the high-pressure pump group is sprayed from the nozzle 3 after passing through the water flow stabilizing section 2 and the rapid contraction section 1 in sequence. The nozzle 3 is located in the groove 4. The groove 4 adopts the structure with the cross-sectional profile of a conic curve, so that the water flow has a greater outlet velocity when sprayed and has a better flat fan-shaped jet surface.

[0051] As preferred, the water flow stabilizing section 2 has a cylindrical cavity. The corresponding end cross-sectional dimension of the rapid contraction section 1 is the same as that of the water flow stabilizing section 2. The rapid contraction section 1 has a conic cavity and rapidly contracts towards the nozzle 3. The end surface of the nozzle 3 is a curved surface obtained after the rapid contraction section 1 intersects with the groove 4.

[0052] The shape of the conic curve is determined by a conic curve shape factor, which is arbitrarily selected between 0 and 1 (excluding 0 and 1).

[0053] Compared with the traditional descaling nozzle, the nozzle structure adopted by the descaling nozzle can efficiently convert the pressure energy into kinetic energy, so that a better flat fan-shaped water jet shape is obtained, the removal effect of the iron oxide scale on the surface of the high-temperature steel billet is better, and the product quality of the steel material is ensured.

[0054] In order to make the purpose, technical scheme and technical effect of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely. However, the following described embodiments are only some of the embodiments of the present application, not all the embodiments. All other embodiments obtained by those skilled in the art without creative labor on the basis of the embodiments in the present application belong to the scope of protection of the present application.

[0055]

Embodiments

[0056] As shown in Figures 1-3 , it is a structure schematic diagram of the descaling nozzle in the present embodiment. As shown in Figure 4 , it is a structure schematic diagram of the descaling nozzle in the present embodiment. The nozzle 6 is tightly installed at the front end of the nozzle body by the outer sleeve. The water flow channel in the nozzle body which is connected with the inner cavity of the nozzle 6 is provided with a filter 10, a flow stabilizer 9, a first contraction section 8 and a second contraction section 7 in sequence from the rear (water inlet end) to the front (nozzle end).

[0057] The water flow enters the nozzle body through the filter 10 and is rectified by the flow stabilizer 9 after the water flow is bundled. The water flow is accelerated by the first contraction section 8. There is a transition zone between the first contraction section 8 and the second contraction section 7. The water flow enters the water flow stabilizing section 2 at the rear end of the nozzle 6 through the second contraction section 7. Finally, the water flow is accelerated by the rapid contraction section 1 and is sprayed from the nozzle 3 at the front end of the nozzle 6.

[0058] The jet 3 on the nozzle 6 directly determines the water flow outlet velocity and jet quality. Compared with the jet on the traditional nozzle, the jet 3 in the embodiment is arranged in the groove 4 with a conic curve profile, and the selection of a proper conic curve shape factor (referred to as shape factor) can meet different requirements of the descaling nozzle under different working conditions, and high-efficiency descaling is realized on this basis.

[0059] When the conic curve shape factor is 0, the profile curve of the groove is U-shaped, referred to as U-shaped groove; when the conic curve shape factor is 1, the profile curve of the groove is V-shaped, referred to as V-shaped groove; the U-shaped groove and the V-shaped groove are also the main shapes of the traditional groove. When the conic curve shape factor is between 0 and 1 (except 0 and 1), that is, the groove with the conic curve profile described in the embodiment, referred to as conic curve groove. Simulation tests are carried out on the nozzles with the above three groove structures, and the outlet average velocity change graph with the shape factor is obtained, that is Figure 5 , the outlet flow and the jet area change graph with the shape factor is obtained, that is Figure 6 .

[0060] Figure 5 In the figure, the horizontal axis is the conic curve shape factor, and the vertical axis is the outlet average velocity of the water flow. It can be seen from the simulation results that under the same pressure, the outlet average velocity of the U-shaped groove nozzle is obviously smaller than that of the conic curve groove nozzle. When the conic curve shape factor is 0.75-0.9, the outlet average velocity is greater than that of the V-shaped groove nozzle.

[0061] Conclusion: Compared with the traditional nozzle structure with U-shaped groove and V-shaped groove, the nozzle with conic curve groove, especially when the conic curve shape factor is between 0.75 and 0.9, has better kinetic performance, and is more conducive to improving the on-site descaling efficiency.

[0062] Figure 6 In the figure, the horizontal axis is the conic curve shape factor, the left vertical axis is the outlet flow of the water flow, and the right vertical axis is the outlet area, and the dotted line is the theoretical outlet flow. It can be seen from the simulation results that the outlet area and flow of the nozzle with U-shaped groove are small, which is beneficial to reducing water resource consumption, but will lead to a decrease in outlet velocity, which is not conducive to the complete removal of iron oxide scale and affects the surface quality of the product. The outlet area and flow of the nozzle with V-shaped groove are large, which will produce a large outlet velocity and impact force, which is conducive to on-site descaling, but will cause a large consumption of water resources. Compared with the above two structures, the nozzle with conic curve groove can efficiently convert pressure energy into kinetic energy, so as to reduce water resource consumption while meeting the actual descaling requirements on site.

[0063] For example, when the descaling impact force required in the field is small, a conic curve groove with a small conic curve shape factor can be used, in which case the outlet flow of the nozzle is slightly increased compared with the nozzle using a U-shaped groove, but the corresponding outlet velocity is significantly increased. When the descaling impact force required in the field is large, a conic curve groove with a conic curve shape factor of 0.75-0.9 can be used, in which case the outlet flow of the nozzle is small and the velocity is large.

[0064] Conclusion: The descaling nozzle of the present application is used in this embodiment, which achieves the purpose of reducing water consumption while meeting the actual descaling requirements in the field. Compared with the traditional nozzle using a U-shaped groove or a V-shaped groove, the nozzle using a conic curve groove has better kinetic performance, and the best outlet flow can be obtained when the conic curve shape factor is 0.75-0.9 (more preferably 0.75-0.85). Considering the outlet velocity and flow of the nozzle, a nozzle with different conic curve grooves suitable for different working conditions can be obtained, thereby obtaining the best descaling effect.

[0065] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes within the technical range disclosed in the present application according to the technical solution and inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A descaling nozzle comprising a nozzle body, one end of the nozzle body being a jetting end and the other end being a connecting end connected with a nozzle body; a transversely through groove is arranged at the jetting end of the nozzle body, and a nozzle opening is arranged at the center of the groove; a cavity is arranged at the middle part of the nozzle body and connected with the nozzle opening; characterized in that, The cross-sectional profile of the groove is a conic curve; the conic curve is an axisymmetric curve, and in a Cartesian coordinate system, along the positive direction of the longitudinal axis, the shape function of the conic curve is as follows: ； In the formula, y is the longitudinal coordinate of any point P on the conic curve; X is the transverse coordinate of any point P on the conic curve; a and b are constants varying with the conic curve shape factor, and the relationship between a, b and the conic curve shape factor is as follows: ； ； In the formula, C is the conic curve shape factor, and 0 < the conic curve shape factor C < 1; The cavity in the middle of the nozzle is composed of a rapid contraction section and a water flow stabilizing section, wherein the rapid contraction section is arranged close to the end of the nozzle opening; the nozzle opening is a curved opening formed after the rapid contraction section intersects with the groove.

2. A descaling lance according to claim 1, characterised in that The water flow stabilizing section is a circular hole structure.

3. The descaling nozzle of claim 1, wherein The rapid contraction section is a conic hole structure that is contracted towards the end of the nozzle opening.

4. The descaling nozzle of claim 1, wherein The conic curve shape factor C is 0.75-0.

9.

5. The descaling nozzle of claim 1, wherein The material of the nozzle is tungsten carbide.

6. A descaling nozzle characterized by, The descaling nozzle comprises any one of the descaling nozzles according to claims 1-5.

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