Gas atomization molten steel flow guide pipe

Abstract

The utility model discloses a gas atomization molten steel flow guide pipe which comprises an upper end pipe and a lower end pipe. The upper end pipe is provided with a first channel, and the lower end pipe is provided with a second channel; the lower end pipe is coaxially arranged below the upper end pipe; the inner diameter of the first channel is larger than that of the second channel, a buffering arc face is arranged on the side, close to the second channel, of the first channel, and the first channel is communicated with the second channel through the buffering arc face. The gas atomization molten steel flow guide pipe is provided with an upper end pipe and a lower end pipe, and the disorder state of molten steel flowing in the flow guide pipe is improved through the two-stage guide pipe structure. And moreover, a buffering cambered surface is further arranged, the molten steel is effectively guided to flow along the inner wall of the runner through the buffering cambered surface, and the phenomena of reverse flow, vortex and separation in the flowing process are reduced, so that the molten steel is more stable in the flowing process, the flowing instability is reduced, the stability of the atomization process can be improved, and the atomization efficiency and the quality of atomized powder can be improved.

Description

Technical Field

[0001] The utility model relates to the field of powder preparation tools, in particular to a gas atomization molten steel guide tube. Background Art

[0002] Among metal powder manufacturing methods, gas atomization is one of the most widely used. The main process of gas atomization is as follows: molten steel, after induction melting, is poured into a tundish. The molten steel flows through a draft tube at the bottom of the tundish into an atomizer where it is atomized to form metal powder.

[0003] Traditional draft tubes are generally flat-bottomed, straight-through types, and are made of corundum or zirconium oxide. However, the existing draft tube structure is relatively simple. When molten steel flows into the draft tube, it tends to become disordered, causing changes in the movement trajectory of the molten steel and the atomization focus, thereby affecting the quality of the atomized powder. Utility Model Content

[0004] The utility model aims to provide a gas atomization molten steel guide tube to solve the problem that the existing guide tube is prone to a disordered state of molten steel during use, resulting in changes in the movement trajectory of the molten steel and the atomization focus.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] The utility model provides a gas-atomized molten steel guide pipe, comprising an upper end pipe and a lower end pipe; the upper end pipe is provided with a first channel, and the lower end pipe is provided with a second channel; the lower end pipe is coaxially arranged below the upper end pipe; the inner diameter of the first channel is greater than the inner diameter of the second channel, and the inner wall of the first channel at one end close to the second channel is provided with a buffer arc surface, and the first channel is connected with the second channel through the buffer arc surface; the top of the upper end pipe is provided with a feed port, and the bottom of the lower end pipe is provided with a discharge port, the feed port is connected with the first channel, and the discharge port is connected with the second channel.

[0007] In the gas-atomized molten steel guide pipe, a transition arc surface is provided on the outer edge of the bottom of the lower end pipe.

[0008] In the gas atomized molten steel guide tube, the upper end tube and the lower end tube are both made of boron nitride.

[0009] In the gas-atomized molten steel guide pipe, the ratio between the height of the upper end pipe and the height of the lower end pipe is (2-4):1.

[0010] In the gas-atomized molten steel flow guide pipe, the outer diameter of the feed port is 24-30 mm, and the inner diameter of the feed port is 20-24 mm; the outer diameter of the discharge port is 18-22 mm, and the inner diameter of the discharge port is 3.5-7.0 mm.

[0011] In the gas-atomized molten steel flow guide pipe, the discharge port is in the shape of a polygonal star.

[0012] In the gas-atomized molten steel guide pipe, the polygonal star has 8 to 16 corners.

[0013] In the gas atomized molten steel guide pipe, a plurality of grooves are provided on one end of the outer wall of the upper end pipe near the top. The cross-section of the grooves is triangular and the grooves are spaced apart along the height direction of the upper end pipe.

[0014] A technical solution in the present invention can have the following beneficial effects:

[0015] The gas atomization molten steel guide pipe is provided with an upper end pipe and a lower end pipe, and the turbulent state of the molten steel when flowing inside the guide pipe is improved through the two-stage guide pipe structure; moreover, a buffer arc surface is also provided, which effectively guides the molten steel to flow along the inner wall of the flow channel, reduces the backflow, eddy current and separation phenomena in the flow, makes the molten steel flow more smoothly, reduces the instability of the flow, improves the stability of the atomization process, and improves the atomization efficiency and the quality of the atomized powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of one embodiment of the present utility model;

[0017] Figure 2 It is a cross-sectional schematic diagram of one embodiment of the present utility model;

[0018] Figure 3 This is a bottom view schematic diagram of a discharge port in one embodiment of the present utility model;

[0019] In the accompanying drawings: upper end tube 1, lower end tube 2;

[0020] First channel 10; buffer arc surface 11; groove 12; second channel 20; transition arc surface 21;

[0021] Feed port 101; discharge port 201. DETAILED DESCRIPTION

[0022] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0023] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limitations on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more such features, and are used to distinguish between the described features without distinction of order or importance.

[0024] In the description of the present invention, unless otherwise specified, “a plurality of” means two or more.

[0025] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0026] Please refer to Figures 1 to 3 The utility model provides a gas-atomized molten steel guide pipe, comprising an upper end pipe 1 and a lower end pipe 2; the upper end pipe 1 is provided with a first channel 10, and the lower end pipe 2 is provided with a second channel 20; the lower end pipe 2 is coaxially arranged below the upper end pipe 1; the inner diameter of the first channel 10 is larger than the inner diameter of the second channel 20, and the inner wall of the first channel 10 at one end close to the second channel 20 is provided with a buffer arc surface 11, and the first channel 10 is connected with the second channel 20 through the buffer arc surface 11; the top of the upper end pipe 1 is provided with a feed port 101, and the bottom of the lower end pipe 2 is provided with a discharge port 201, the feed port 101 is connected with the first channel 10, and the discharge port 201 is connected with the second channel 20.

[0027] The gas atomization molten steel guide pipe is provided with an upper end pipe 1 and a lower end pipe 2, and the turbulent state of the molten steel when flowing inside the guide pipe is improved through the two-stage conduit structure; moreover, a buffer arc surface 11 is also provided, which effectively guides the molten steel to flow along the inner wall of the flow channel, reduces the backflow, eddy current and separation phenomena in the flow, makes the molten steel flow more smoothly, reduces the instability of the flow, improves the stability of the atomization process, and improves the atomization efficiency and the quality of the atomized powder.

[0028] The inner diameter of the first channel 10 is larger than that of the second channel 20. Therefore, the first channel 10 can accommodate more molten steel. The high-temperature molten steel transfers the temperature to the entire atomized molten steel guide pipe through heat conduction, reducing the cooling rate of the guide pipe and thereby reducing the probability of blockage.

[0029] Specifically, a transition arc surface 21 is provided on the outer edge of the bottom of the lower end tube 2 .

[0030] With this structure, the transition arc surface 21 helps maintain a more uniform pressure distribution during the ejection of the molten steel. This uniform pressure distribution helps maintain the directional injection of the molten steel, reduces the extent of its diffusion, further improves the stability of the atomization process, and thus enhances the quality of the atomized powder.

[0031] Specifically, the upper tube 1 and the lower tube 2 are both made of boron nitride.

[0032] In existing technology, gas atomization molten steel flow tubes are made of corundum or zirconia. However, corundum has poor thermal shock resistance, while zirconia has poor erosion resistance. Corundum-made flow tubes experience large dimensional fluctuations due to thermal expansion, making it difficult to control their dimensions. This leads to unstable flow rates and flow rates, impacting the quality of the atomized powder. Zirconia-made flow tubes, on the other hand, are prone to cracking after repeated use, requiring frequent replacement and impacting production efficiency.

[0033] The gas atomization steel liquid guide tube described in the utility model is made of boron nitride and is integrally formed. It has the characteristics of low friction coefficient, good high-temperature stability, good erosion resistance, good thermal shock resistance and low expansion coefficient. This makes the gas atomization steel liquid guide tube have a long service life and does not require frequent replacement. The dimensions are stable after heating, avoiding affecting the quality of the atomized powder.

[0034] Specifically, the ratio between the height of the upper end tube 1 and the height of the lower end tube 2 is (2-4):1.

[0035] In a specific embodiment of the present invention, the height of the upper tube 1 is 60-100 mm, and the height of the lower tube 2 is 20-50 mm. The above ratio can effectively improve the flow state of the molten steel, making the molten steel flow more stable and reducing flow instability.

[0036] Specifically, the outer diameter of the feed port 101 is 24-30 mm, and the inner diameter of the feed port 101 is 20-24 mm; the outer diameter of the discharge port 201 is 18-22 mm, and the inner diameter of the discharge port 201 is 3.5-7.0 mm.

[0037] The transition arc surface 21 is arranged outside the discharge port 201. In the specific embodiment of the present invention, the feed port 101 and the discharge port 201 of the above-mentioned size are adopted to reduce the diffusion of the molten steel to the surroundings and improve the stability of the atomization process.

[0038] Specifically, the discharge port 201 is in the shape of a polygonal star.

[0039] The end of the circular draft tube will cause the temperature to be too high due to the adhesion of molten steel. Excessive temperature will easily cause the draft tube to rupture and increase the atomization cost. In addition, the metal produces liquid slag during the smelting process. Excessive liquid slag will condense and form a nodule at the end of the draft tube during the flow process, causing the outlet to become smaller and smaller until it is blocked, reducing the atomization efficiency and even terminating the atomization.

[0040] Compared with the smooth circular outlet at the end of the guide tube, the polygonal star-shaped outlet makes it difficult for droplets or slag to adhere, thereby avoiding blockage of the guide tube. The metal liquid flows smoothly and the flow field mixing is also enhanced.

[0041] Specifically, the polygonal star has 8 to 16 corners.

[0042] The above structure can effectively prevent the liquid slag from adhering to the discharge port 201, thereby improving the atomization efficiency.

[0043] Specifically, a plurality of grooves 12 are formed on one end of the outer wall of the upper end tube 1 close to the top. The cross section of the grooves 12 is triangular and the grooves 12 are spaced apart along the height direction of the upper end tube 1 .

[0044] The above structure can increase the contact size between the binder and the inner hole of the tundish crucible, make the upper end tube 1 of the guide tube adhere more firmly to the inner hole of the tundish crucible, and reduce the leakage rate of molten steel.

[0045] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and should not be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will be able to devise other specific embodiments of the present invention without inventive effort, and such equivalent variations or substitutions are encompassed within the scope of the claims of this application.

Claims

1. A gas atomized molten steel guide tube, characterized in that: It includes an upper end tube and a lower end tube; the upper end tube is provided with a first channel, and the lower end tube is provided with a second channel; the lower end tube is coaxially arranged below the upper end tube; the inner diameter of the first channel is larger than the inner diameter of the second channel, and the inner wall of the first channel at one end close to the second channel is provided with a buffer arc surface, and the first channel is connected with the second channel through the buffer arc surface; the top of the upper end tube is provided with a feed port, and the bottom of the lower end tube is provided with a discharge port, the feed port is connected with the first channel, and the discharge port is connected with the second channel.

2. The gas atomized molten steel guide pipe according to claim 1, characterized in that: The outer edge of the bottom of the lower end tube is provided with a transition cambered surface.

3. The gas atomized molten steel guide pipe according to claim 1, characterized in that: The upper end tube and the lower end tube are both made of boron nitride.

4. The gas atomized molten steel guide pipe according to claim 1, characterized in that: The ratio between the height of the upper end tube and the height of the lower end tube is (2-4):

1.

5. The gas atomized molten steel guide pipe according to claim 1, characterized in that: The outer diameter of the feed port is 24-30 mm, and the inner diameter of the feed port is 20-24 mm; the outer diameter of the discharge port is 18-22 mm, and the inner diameter of the discharge port is 3.5-7.0 mm.

6. The gas atomized molten steel flow guide pipe according to claim 1, characterized in that: The discharge port is in the shape of a polygonal star.

7. The gas atomized molten steel guide pipe according to claim 6, characterized in that: The polygonal star has 8 to 16 corners.

8. The gas atomized molten steel flow guide pipe according to claim 1, characterized in that: A plurality of grooves are provided on one end of the outer wall of the upper end tube close to the top. The cross section of the grooves is triangular and the grooves are arranged at intervals along the height direction of the upper end tube.

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