A refining tube for aluminum alloy melt

Abstract

The utility model discloses a kind of refining tubes for aluminum alloy melt, including main air inlet pipe, the lower end of main air inlet pipe is communicated with shunt cylinder, shunt cylinder is communicated with several spiral finned tubes, spiral finned tube includes central tube and spiral fin, central tube is inverted L type elbow pipe structure, the end of central tube horizontal section is communicated with shunt cylinder, spiral fin is arranged on the outer surface of central tube vertical section around, spiral fin is hollow structure and is communicated with central tube, along the edge of spiral fin tangentially there are several air outlet holes.The utility model is introduced along main air inlet pipe, shunt cylinder, the vertical section of central tube by refining gas, refining gas enters hollow spiral fin and is accelerated and guided tangential air outlet hole, so that refining gas can form stable, intense rotating airflow when spouting, rotating airflow produces airflow stirring effect to aluminum alloy melt refining furnace melt, effectively increase refining gas and melt contact surface area, realize the efficient occurrence of refining effect, improve refining effect.

Description

Technical Field

[0001] This utility model relates to the technical field of aluminum alloy liquid refining equipment, specifically to a refining tube for aluminum alloy melt. Background Technology

[0002] During the smelting process of aluminum alloys, the molten metal absorbs hydrogen gas and reacts with impurities such as oxides, leading to defects such as porosity and inclusions in the castings, severely impairing their mechanical properties and density. To remove hydrogen gas and non-metallic inclusions and obtain pure aluminum melt, melt refining is necessary. Currently, the most widely used method is to use an inert gas (such as argon) or an active gas (such as chlorine) as the refining medium. The gas is introduced into the molten aluminum through a refining tube inserted into the melt, utilizing the flotation effect of the bubbles to carry away the hydrogen gas and impurities.

[0003] With the upgrading of equipment in aluminum processing enterprises, the size of aluminum alloy melt refining furnaces is getting larger and larger. Traditional single-tube refining tubes usually have straight holes for the gas outlet, resulting in large bubbles with a single and concentrated upward floating path. This means that the refining gas can only treat a local area of ​​the molten pool, resulting in a large number of refining dead zones. Especially for large refining furnaces, the molten metal at the edge and bottom of the molten pool is difficult to treat effectively, resulting in uneven composition and purity of the aluminum liquid in the whole furnace, low refining efficiency, and poor refining effect. Summary of the Invention

[0004] The main purpose of this utility model is to overcome the defects of the above-mentioned background technology and provide a refining tube for aluminum alloy melt.

[0005] To achieve the above objectives, this utility model proposes a refining tube for molten aluminum alloy, comprising a main inlet pipe, the lower end of which is connected to a distributor cylinder. Several spiral finned tubes are connected to the distributor cylinder. Each spiral finned tube includes a central tube and spiral fins. The central tube has an inverted L-shaped bend structure, and the horizontal section of the central tube is connected to the distributor cylinder. The spiral fins are arranged around the outer surface of the vertical section of the central tube, and are hollow in structure and connected to the central tube. Several outlet holes are provided tangentially along the edge of the spiral fins. The refining gas is accelerated and guided to the tangential outlet holes as it flows through the hollow spiral fins, ensuring a stable and strong rotating airflow upon ejection. This rotating airflow agitates the melt, effectively improving the refining effect.

[0006] To further optimize the technical solution, the spiral fins are arranged in a spiral upward configuration. This achieves uniform axial gas distribution and avoids gas concentration.

[0007] The technical solution is further optimized so that the diameter of the air outlet is 1-2mm.

[0008] To further optimize the technical solution, the refining tube for the aluminum alloy melt also includes a rotary joint. One end of the rotary joint is connected to the lower end of the main air inlet pipe, and the other end is connected to the upper end of the distributor. The rotary joint enables the reverse force generated by the spiral airflow to drive the entire spiral finned tube to rotate around the main air inlet pipe for mechanical stirring.

[0009] To further optimize the technical solution, a pressure gauge, a flow meter, and a first valve are sequentially installed on the main intake pipe.

[0010] To further optimize the technical solution, a purge air pipe is connected to the main intake pipe.

[0011] To further optimize the technical solution, a second valve is provided on the purging air pipe.

[0012] To further optimize the technical solution, the refining tube for aluminum alloy melt also includes an installation support assembly, which is fixedly connected to the main air inlet pipe.

[0013] To further optimize the technical solution, the installation support assembly includes an installation plate and a support rod. The main air intake pipe has an external thread section on its body. The installation plate has a through hole in its center. The external thread section passes through the through hole. A clamping nut is provided on the external thread section. The clamping nut is clamped on the upper and lower end faces of the installation plate respectively. The support rod is horizontally fixed around the circumference of the installation plate and abuts against the top of the aluminum alloy melt refining furnace.

[0014] To further optimize the technical solution, the top edge of the aluminum alloy melt refining furnace is provided with a U-shaped locking block corresponding to the support rod.

[0015] The beneficial effects of this invention include: by introducing refining gas along the main inlet pipe, the refining gas is diverted through the distributor and enters the vertical section of the central tube, while simultaneously entering the hollow spiral fins. The refining gas is accelerated and guided to the tangential outlet as it flows through the spiral fins, so that a stable and strong rotating airflow can be formed when the refining gas is accelerated and ejected. The rotating airflow generates an airflow stirring effect on the melt in the aluminum alloy melt refining furnace, which increases the residence time of the refining gas in the melt and enables the melt to be rapidly propelled from the working area of ​​the refining tube to the far end. The surrounding melt continuously fills the working area of ​​the refining tube, effectively increasing the contact surface area between the refining gas and the melt, realizing the efficient occurrence of the refining action and improving the refining effect. Attached Figure Description

[0016] Figure 1 This is an overall schematic diagram of the refining tube used for aluminum alloy melt in an embodiment of this utility model.

[0017] Figure 2 This is a schematic diagram of the spiral finned tube after being cut in an embodiment of this utility model.

[0018] Figure 3 This is a schematic diagram of the refining tube being installed on the aluminum alloy melt refining furnace in an embodiment of this utility model.

[0019] Reference numerals: 1 Main inlet pipe; 2 Flow divider; 3 Spiral finned tube; 301 Center tube; 302 Spiral fin; 303 Outlet; 4 Rotary joint; 5 Pressure gauge; 6 Flow meter; 7 First valve; 8 Purge pipe; 9 Second valve; 10 Mounting support assembly; 101 Mounting plate; 102 Support rod; 103 External thread section; 104 Clamping nut; 11 Aluminum alloy melt refining furnace; 111 U-shaped locking block. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects of the embodiments of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be for both fixing and circuit connection purposes.

[0022] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] Please see Figures 1 to 3The refining tube for aluminum alloy melt disclosed in one embodiment includes a main inlet pipe 1. A flow divider 2 is connected to the lower end of the main inlet pipe 1. A plurality of spiral finned tubes 3 are connected to the flow divider 2. The spiral finned tubes 3 include a central tube 301 and spiral fins 302. The central tube 301 has an inverted L-shaped bend structure. The end of the horizontal section of the central tube 301 is connected to the flow divider 2. The spiral fins 302 are arranged around the outer surface of the vertical section of the central tube 301. The spiral fins 302 have a hollow structure and are connected to the central tube 301. A plurality of air outlets 303 are provided tangentially along the edge of the spiral fins 302. Specifically, three spiral finned tubes 3 are provided, arranged at 120° intervals around the distributor 2. The dimensions of the horizontal and vertical sections of the central tube 301 correspond to the dimensions of the aluminum alloy melt refining furnace 11, ensuring that the molten metal in the entire circumference of the aluminum alloy melt refining furnace 11 can be uniformly processed, completely avoiding the refining blind zone that may be generated by a single tube. The spiral fins 302 are spirally arranged upwards, and the exhaust holes 303 are arranged at intervals along the spiral line of the edge of the spiral fins 302. The root of the spiral fins 302 is connected to the side wall of the central tube 301. The diameter of the exhaust holes 303 is 1-2 mm, for example, 1 mm, 1.5 mm, 2 mm, preferably 1 mm, to ensure that a large number of fine and dispersed refining bubbles are generated, maximizing the gas-liquid contact area. The upper end of the main inlet pipe 1 is connected to the external refining gas. The gas source is connected, and the refining gas uses argon, chlorine, nitrogen, or a mixture of these gases. The main inlet pipe 1 and the distributor 2 have the same diameter, and the diameter of the central pipe 301 is 1 / 3 of the diameter of the main inlet pipe 1. This naturally increases the flow velocity when the gas enters the central pipe 301, which is beneficial for the gas to be transported to the spiral fins 302. When the refining gas enters the hollow channel of the spiral fins 302 from the central pipe 301, the cross-sectional area of ​​the flow channel decreases. According to the principle of fluid mechanics, the airflow velocity will increase. At this time, the interior of the spiral fins 302 is equivalent to a miniature curved spray gun. When the refining gas flows through the spiral fins 302, the flow direction has been fixed to the tangential direction of the spiral, and then it is ejected from the outlet 303. The distributor 2 is an existing technology product, which can divide the airflow in the main inlet pipe 1 into three streams that enter the central pipe 301 respectively. In this embodiment, the refining gas enters along the main inlet pipe 1, and after being diverted by the distributor 2, it enters the central pipe 301. As soon as the refining gas enters the vertical section of the central pipe 301, it immediately enters the hollow flow channel of the spiral fin 302. The refining gas is accelerated and guided to the tangential outlet 303 as it flows through the hollow spiral fin 302 flow channel, ensuring that a stable and strong rotating airflow can be formed when it is ejected. The rotating airflow generates an airflow stirring effect on the melt in the aluminum alloy melt refining furnace 11 and achieves the local dispersion effect of refining bubbles, thereby increasing the contact surface area between the refining gas and the melt and greatly improving the hydrogen evolution efficiency in the molten metal.By rotating the refining gas, the residence time of the refining gas in the melt is increased. At the same time, by achieving the rotation of the refining gas and the gas acceleration effect of the spiral fins 302, the melt can be rapidly propelled from the working area of ​​the refining tube to the far end. The surrounding melt continuously fills the working area of ​​the refining tube, realizing the efficient occurrence of the refining process and effectively improving the refining effect.

[0025] In a preferred embodiment, the refining tube for the aluminum alloy melt further includes a rotary joint 4. One end of the rotary joint 4 is connected to the lower end of the main inlet pipe 1, and the other end of the rotary joint 4 is connected to the upper end of the distributor 2. The rotary joint 4 adopts existing technology, and its specific structure will not be described in detail here. By setting the rotary joint 4, the main inlet pipe 1 can introduce refining gas into the distributor 2, while the distributor 2 and the spiral finned tube 3 can rotate around the main inlet pipe 1. When the high-pressure refining gas is ejected at high speed from the tangential outlet 303 at the edge of the spiral fin 302, it will give the outlet 303 a reverse force to drive the entire spiral finned tube 3 to rotate and continue stirring, generating mechanical shear force on the melt, further breaking large bubbles into smaller dispersed bubbles, so that the bubbles are no longer limited to a few fixed vertical paths to float, but float in a spiral trajectory in the entire aluminum alloy melt refining furnace 11, with a more uniform distribution, further increasing the gas-liquid reaction area and improving the refining effect.

[0026] In a specific example, a pressure gauge 5, a flow meter 6, and a first valve 7 are sequentially installed on the main intake pipe 1. All three are existing technologies. The pressure gauge 5 is an OHR-DP10 intelligent digital pressure gauge, and the flow meter 6 is an FE20 electromagnetic flow meter, monitoring the pressure and flow rate of the refining gas entering the main intake pipe 1. The first valve 7 is a regulating valve, such as a G10-2-3810 electric single-seat regulating valve, adjusting the flow rate of the refining gas entering the main intake pipe 1. This transforms the refining process from one based on experience-based estimation into a quantifiable and precisely controllable process, ensuring the refining effect.

[0027] In a preferred embodiment, a purge pipe 8 is connected to the main intake pipe 1. Specifically, a second valve 9 is provided on the purge pipe 8. The second valve 9 is of the same type as the first valve 7. One end of the purge pipe 8 is connected to an external nitrogen source. When chlorine is used as the refining gas, chlorine may remain in the main intake pipe 1 and the spiral finned tube 3 after refining. If the refining tube is pulled out at this time, the residual chlorine will produce a large amount of yellow smoke. Chlorine has a strong pungent odor, which seriously affects the working environment. By introducing nitrogen through the purge pipe 8 before pulling out the refining tube, the residual toxic chlorine in the pipe is completely replaced and removed with nitrogen, preventing chlorine from leaking into the workshop air, ensuring the safety of operators and meeting environmental protection requirements. In a preferred embodiment, the refining tube for aluminum alloy melt further includes a mounting support assembly 10, which is fixedly connected to the main intake pipe 1. Specifically, the mounting support assembly 10 includes a mounting plate 101 and a support rod 102. An external threaded section 103 is provided on the body of the main intake pipe 1, and a through hole is opened at the center of the mounting plate 101. The external threaded section 103 passes through this through hole, and a clamping nut 104 is fitted onto the external threaded section 103. The clamping nuts 104 clamp the components respectively... The upper and lower end faces of the mounting plate 101 are secured by rotating the clamping nut 104 to lock the position of the main air intake pipe 1 on the mounting plate 101. The support rod 102 is horizontally fixed around the circumference of the mounting plate 101 and abuts against the top of the aluminum alloy melt refining furnace 11. A U-shaped locking block 111 corresponding to the support rod 102 is provided at the top edge of the aluminum alloy melt refining furnace 11. The end of the support rod 102 away from the mounting plate 101 is locked in the U-shaped locking block 111. Three support rods are provided. Similarly, three U-shaped locking blocks 111 are provided, and three support rods 102 are distributed around the mounting plate 101 at a 120° interval. The entire refining tube is installed onto the opening of the aluminum alloy melt refining furnace 11 through the mounting plate 101 and the support rods 102, and the vertical section (spiral fins 302) of the central tube 301 of the refining tube extends into the aluminum alloy melt below. The height of the vertical section of the central tube 301 extending into the aluminum alloy melt is determined by loosening the clamping nut 104. The entire refining tube can then move freely up and down along its axial direction (vertical direction). The support rods 102 are arranged horizontally around the mounting plate 101, forming a stable "umbrella frame" or "derrick" structure. This structure evenly distributes the entire weight of the refining tube and various forces generated during operation, such as vibration and torque, to multiple support points, and then transmits them to the aluminum alloy melt refining furnace 11 through the support rods 102, improving the stability of the installation. When disassembling the entire refining tube, it can be lifted directly upwards, improving the convenience of installation.

[0028] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the present invention to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the protection scope of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the scope of protection of the patent application.

Claims

1. A refining tube for molten aluminum alloy, characterized in that: It includes a main intake pipe, the lower end of which is connected to a flow divider. Several spiral finned tubes are connected to the flow divider. Each spiral finned tube includes a central tube and spiral fins. The central tube has an inverted L-shaped bend structure. The end of the horizontal section of the central tube is connected to the flow divider. The spiral fins are arranged around the outer surface of the vertical section of the central tube. The spiral fins have a hollow structure and are connected to the central tube. Several air outlets are provided tangentially along the edge of the spiral fins.

2. The refining tube for aluminum alloy melt as described in claim 1, characterized in that: The spiral fins are arranged in a spiral upward configuration.

3. The refining tube for aluminum alloy melt as described in claim 2, characterized in that: The diameter of the air outlet is 1-2 mm.

4. The refining tube for aluminum alloy melt as described in claim 3, characterized in that: It also includes a rotary joint, one end of which is connected to the lower end of the main intake pipe, and the other end of which is connected to the upper end of the distributor tube.

5. The refining tube for aluminum alloy melt as described in claim 4, characterized in that: The main intake pipe is equipped with a pressure gauge, a flow meter, and a first valve in sequence.

6. The refining tube for aluminum alloy melt as described in claim 5, characterized in that: A purge air pipe is connected to the main intake pipe.

7. The refining tube for aluminum alloy melt as described in claim 6, characterized in that: The purging air pipe is equipped with a second valve.

8. The refining tube for aluminum alloy melt as described in any one of claims 1 to 7, characterized in that: It also includes a mounting support assembly, which is fixedly connected to the main intake pipe.

9. The refining tube for aluminum alloy melt as described in claim 8, characterized in that: The mounting support assembly includes a mounting plate and a support rod. The main air intake pipe has an external thread section on its body. The mounting plate has a through hole at its center. The external thread section passes through the through hole. The external thread section is provided with a clamping nut. The clamping nut is clamped on the upper and lower end faces of the mounting plate respectively. The support rod is horizontally fixed around the circumference of the mounting plate and abuts against the top of the aluminum alloy melt refining furnace.

10. The refining tube for aluminum alloy melt as described in claim 9, characterized in that: The top edge of the aluminum alloy melt refining furnace is provided with a U-shaped locking block corresponding to the support rod.

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