Graphite rotor for removing hydrogen from molten aluminum

Abstract

The application relates to a graphite rotor for removing hydrogen from molten aluminum, and belongs to the technical field of molten aluminum treatment. The graphite rotor for removing hydrogen from molten aluminum comprises a rotor rod, a coaxial gas outlet hole, a nozzle, a coaxial gas outlet cavity, a plurality of gas distribution holes on the side and bottom of the nozzle, and the gas outlet cavity is communicated with the gas outlet hole. Since the gas pressure of nitrogen / argon gas entering the nozzle is large, the gas is separated and sprayed from each gas distribution hole, is automatically cut into multiple paths, has a high flow rate, is more easily broken, the particle size of the gas bubbles is smaller, the gas bubbles are more uniformly dispersed in the molten aluminum, and the hydrogen removal effect of the molten aluminum is improved.

Description

Technical Field

[0001] This application relates to the technical field of aluminum liquid treatment, and in particular to a graphite rotor for removing hydrogen from aluminum liquid. Background Technology

[0002] The working principle of the graphite rotor is as follows: the rotating rotor breaks the nitrogen (or argon) gas blown into the molten aluminum into a large number of dispersed bubbles, which are then dispersed in the molten metal. The bubbles absorb hydrogen and oxide inclusions in the melt through the gas partial pressure difference and surface adsorption principle, and are carried to the surface of the melt as the bubbles rise, thus purifying the melt.

[0003] Reference Figure 1 The graphite rotor in the related technology consists of two parts: a rotor rod 100 and a nozzle 200. The nozzle 200 is sealed and installed at one end of the rotor rod 100 by a sealing gasket. The rotor rod 100 and the nozzle 200 are coaxially provided with an air outlet 110.

[0004] Although the graphite rotor breaks the nitrogen / argon gas discharged from the outlet 110 into a large number of diffuse bubbles after rotation, most of the bubbles will still concentrate in the molten aluminum near the outlet of the nozzle 200, affecting the uniform mixing of nitrogen / argon gas and molten aluminum, and thus affecting the hydrogen removal effect of the molten aluminum. Utility Model Content

[0005] To further improve the uniform mixing of nitrogen / argon gas with molten aluminum and thus enhance the hydrogen removal effect of molten aluminum, this application provides a graphite rotor for removing hydrogen from molten aluminum, employing the following technical solution: A graphite rotor for removing hydrogen from molten aluminum, comprising: The rotor rod has an air outlet hole coaxially opened; The nozzle is sealed and installed at one end of the rotor rod, and has an air outlet chamber coaxially formed therein, which is connected to the air outlet hole; the nozzle has several air distribution holes on its side and bottom that are connected to the air outlet chamber.

[0006] By adopting the above technical solution, due to the high pressure of the nitrogen / argon gas entering the nozzle, the gas will be separated and sprayed out from each gas distribution hole, and will be automatically cut into multiple paths. At the same time, the gas flow rate is high, making it easier to break up the gas. Therefore, the particle size of the bubbles is smaller and more evenly dispersed in the aluminum liquid, which improves the effect of removing hydrogen from the aluminum liquid.

[0007] Optionally, the total area of ​​the air distribution holes is smaller than the area of ​​the air outlet holes.

[0008] By adopting the above technical solution, the gas pressure in the outlet chamber is increased, the flow rate is increased, and a jet-like pattern is formed.

[0009] Optionally, a buffer chamber is also coaxially formed inside the nozzle. The buffer chamber is located on the side of the air outlet chamber away from the air outlet, and the buffer chamber is connected to the air outlet chamber and the air distribution hole. The diameter of the buffer chamber is larger than the diameter of the air outlet chamber.

[0010] By adopting the above technical solution, the buffer chamber can stabilize the airflow, reduce the intensity of turbulence, and distribute the gas more evenly to each gas distribution hole, thereby reducing bubble size fluctuations and improving the uniformity and efficiency of hydrogen removal.

[0011] Optionally, the air distribution holes are inclined away from the center line of the nozzle.

[0012] By adopting the above technical solution, the inclined gas distribution hole can guide the radial diffusion of bubbles, avoid the accumulation of bubbles in the central area, enhance the three-dimensional dispersion effect of bubbles in the aluminum liquid, thereby expanding the gas-liquid contact area and improving the hydrogen adsorption efficiency.

[0013] Optionally, the nozzle also has an acceleration chamber coaxially formed inside it. The acceleration chamber is located on the side of the air outlet chamber near the air outlet hole, and the acceleration chamber is connected to the air outlet chamber. The diameter of the acceleration chamber is smaller than the diameter of the air outlet chamber.

[0014] By adopting the above technical solution, because the diameter of the acceleration chamber is smaller than that of the outlet chamber, when gas enters the acceleration chamber from the outlet, the flow cross-sectional area decreases, and according to Bernoulli's principle in fluid mechanics, the gas velocity will increase significantly. After the high-speed airflow enters the relatively larger-diameter outlet chamber, it can generate stronger kinetic energy, providing a more sufficient power basis for the subsequent uniform distribution of gas in the buffer chamber and its eventual ejection from the distribution orifice. Furthermore, the high-speed airflow may generate a certain turbulent mixing effect upon entering the outlet chamber, which helps to initially homogenize the gas within the outlet chamber and reduce local pressure differences. This pre-acceleration process ensures that the gas has a higher initial velocity before reaching the distribution orifice, thus achieving a higher exit velocity when ejected from the distribution orifice, further enhancing the effect of "breaking up" the bubbles and reducing the initial bubble size.

[0015] Optionally, the diameter of the air distribution hole on the air outlet chamber is smaller than the diameter of the air distribution hole on the buffer chamber.

[0016] By adopting the above technical solution, the gas injection speed is further reduced, bubble coalescence is avoided, and the uniform distribution of gas in the aluminum melt is enhanced.

[0017] In summary, this application has at least the following beneficial effects: 1. The purpose of opening the gas outlet chamber and gas distribution holes in the nozzle is that, due to the high gas pressure of nitrogen / argon gas entering the nozzle, the gas will be separated and ejected from each gas distribution hole, which will automatically cut into multiple paths. At the same time, the gas flow rate is high and it is easier to break up, so the particle size of the bubbles is smaller and more evenly dispersed in the aluminum liquid, thus improving the effect of removing hydrogen from the aluminum liquid.

[0018] 2. The purpose of making the total area of ​​the air distribution holes smaller than the area of ​​the air outlet holes is to increase the gas pressure in the air outlet chamber, increase the flow rate, and form a jet-like pattern. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the relevant technical structure; Figure 2 This is a schematic diagram of the structure of one embodiment of this application; Figure 3 This is a schematic diagram of another embodiment of this application.

[0020] Explanation of reference numerals in the attached drawings: 100, rotor rod; 110, air outlet; 200, nozzle; 210, air distribution hole; 220, air outlet chamber; 230, buffer chamber; 240, acceleration chamber. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the appendices of the embodiments of this utility model will be described below. Figure 2 -Appendix Figure 3 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] This application discloses a graphite rotor for removing hydrogen from molten aluminum. (See also...) Figure 2 The graphite rotor for removing hydrogen from molten aluminum includes a rotor rod 100 and a nozzle 200. The nozzle 200 is sealed to one end of the rotor rod 100 via a gasket. The rotor rod 100 has a coaxially formed vent hole 110, and the nozzle 200 has a coaxially formed vent chamber 220, which communicates with the vent hole 110. The nozzle 200 has several distribution holes 210 on its side and bottom, which communicate with the vent chamber 220. It should be noted that the total area of ​​the distribution holes 210 is smaller than the area of ​​the vent holes 110. For example, the total area of ​​the distribution holes 210 is 80% of the area of ​​the vent holes 110.

[0023] In another embodiment, a buffer cavity 230 is also coaxially formed inside the nozzle 200. The buffer cavity 230 is formed on the side of the air outlet cavity 220 away from the air outlet 110, and the buffer cavity 230 is connected to the air outlet cavity 220 and the air distribution hole 210. The diameter of the buffer cavity 230 is larger than the diameter of the air outlet cavity 220.

[0024] Furthermore, the diameter of the air distribution hole 210 on the air outlet chamber 220 is smaller than the diameter of the air distribution hole 210 on the buffer chamber 230.

[0025] Furthermore, referring to Figure 3 An acceleration chamber 240 is coaxially formed inside the nozzle 200. The acceleration chamber 240 is located on the side of the air outlet chamber 220 near the air outlet 110, and the acceleration chamber 240 is connected to the air outlet chamber 220. The diameter of the acceleration chamber 240 is smaller than the diameter of the air outlet chamber 220.

[0026] In another embodiment, the air distribution hole 210 may be inclined in a direction away from the center line of the nozzle 200 (not shown in the figure).

[0027] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only one example of a series of equivalent or similar features.

Claims

1. A graphite rotor for removing hydrogen from molten aluminum, characterized in that, include: The rotor rod (100) has an air outlet (110) coaxially opened. The nozzle (200) is sealed and installed at one end of the rotor rod (100), and has an air outlet chamber (220) coaxially opened. The air outlet chamber (220) is connected to the air outlet (110). The nozzle (200) has several air distribution holes (210) on its side and bottom that are connected to the air outlet chamber (220).

2. A graphite rotor for removing hydrogen from molten aluminum according to claim 1, characterized in that, The total area of ​​the air distribution holes (210) is smaller than the area of ​​the air outlet holes (110).

3. A graphite rotor for removing hydrogen from molten aluminum according to claim 2, characterized in that, The nozzle (200) also has a buffer chamber (230) coaxially formed inside. The buffer chamber (230) is located on the side of the air outlet (220) away from the air outlet (110), and the buffer chamber (230) is connected to the air outlet (220) and the air distribution hole (210). The diameter of the buffer chamber (230) is larger than the diameter of the air outlet (220).

4. A graphite rotor for removing hydrogen from molten aluminum according to claim 1, characterized in that, The air distribution hole (210) is inclined away from the center line of the nozzle (200).

5. A graphite rotor for removing hydrogen from molten aluminum according to claim 3, characterized in that, The nozzle (200) also has an acceleration chamber (240) coaxially formed inside. The acceleration chamber (240) is located on the side of the air outlet chamber (220) near the air outlet (110), and the acceleration chamber (240) is connected to the air outlet chamber (220). The diameter of the acceleration chamber (240) is smaller than the diameter of the air outlet chamber (220).

6. A graphite rotor for removing hydrogen from molten aluminum according to claim 3, characterized in that, The diameter of the air distribution hole (210) on the air outlet chamber (220) is smaller than the diameter of the air distribution hole (210) on the buffer chamber (230).

Images