Stirring pump for refining

Abstract

The utility model relates to a stirring pump for refining, which comprises a high temperature resistant motor, a stirring pump and a refining breather pipe, the stirring pump comprises a pump body and a rotating shaft, the pump body comprises an upper pump body and a lower pump body which are connected through a pump flange, the upper pump body is fixed with the motor, the lower end of the lower pump body is provided with a pump cylinder, and a pump impeller is arranged in the pump cylinder. According to the alloy liquid stirring device disclosed by the utility model, alloy liquid under the liquid level is ensured to be fully stirred, and the suspension and retention time of a refining agent in the alloy liquid can be maintained for a longer time, so that inclusions can be fully contacted with the refining agent, and the refining effect is good.

Description

Technical Field

[0001] The utility model relates to a light alloy refining and purification treatment device, in particular to a stirrer for magnesium alloy refining, which provides high-quality metal liquid for casting equipment. Background Art

[0002] In the casting production of magnesium alloys, pure and qualified molten metal needs to be injected into the mold. However, magnesium is easily oxidized to form inclusions, which leads to the degradation of the mechanical properties of magnesium alloy castings or even scrapping. Therefore, magnesium alloys generally need to be refined before casting.

[0003] At present, the refining of magnesium alloys generally adopts the method of adding refining agents and introducing refining gases. The refining agents adsorb or are adsorbed on impurities, causing the impurities to float or sink, thereby purifying the magnesium liquid. However, the method of adding the refining agent and the control of the amount added need to be strictly controlled, otherwise it may be a hidden danger of generating new impurities.

[0004] Manual stirring not only has to face the high temperature working environment, but also the speed is difficult to control. If the speed is too high, the magnesium alloy liquid surface will splash and roll, resulting in aggravated oxidation of the magnesium alloy liquid. If the speed is too slow, the liquid surface is relatively stable, but the refining agent will quickly sink to the bottom of the crucible due to insufficient alloy liquid power under the liquid surface and will not be able to fully contact with the inclusions, resulting in large refining agent consumption and poor refining effect. Utility Model Content

[0005] The utility model aims at the hidden dangers existing in the above-mentioned existing refining technology and develops an automatic stirring pump, which can make the refining agent fully exert its refining effect and fully refine the magnesium alloy under the dual effect of refining gas.

[0006] According to the above design ideas, the utility model adopts double rotors to stir the alloy liquid during the magnesium alloy refining process, which can not only make the alloy liquid in various parts of the refining crucible produce sufficient circulation flow, but also refine the gas molecules of the refining gas introduced into the middle and lower part of the liquid surface by the stirring pump under the controllable stirring speed, avoid the vortex rolling phenomenon of the alloy liquid surface, prevent the oxidation of the alloy, and better protect the magnesium alloy.

[0007] The dual rotor (pump impeller and stirring rotor) structure of this practical design is a multi-blade curved surface structure that rotates with the rotating shaft. When working, the stirring pump is fixed on the sealing cover of the refining furnace through the sealing cover, and then inert refining gas is introduced into the lower part of the sealed liquid, which minimizes the oxidation of the metal melt, saves refining agents, and improves the purification and refining effect of the magnesium alloy.

[0008] A specific technical solution for realizing this utility model is:

[0009] A stirring pump for magnesium alloy refining, the stirring pump comprising a high temperature resistant motor (1), a stirring pump and a refining vent pipe, wherein an upper pump body (7) and a lower pump body (12) in the stirring pump body are connected via a pump flange (11), the upper pump body is a cylindrical structure, and is fixed to the motor via a flange and screws (2), a bearing seat (14) is an upper and lower flange, the middle of which is a cylindrical structure sleeved in the upper pump body, the upper flange is used to fix the driving motor (1), the lower flange is connected to the pump flange (11) via screws and is fixed to a crucible sealing cover, two bearings (9) are installed in the cylinder, a rotating shaft (6) is installed in the inner hole of the bearing (9), and the rotating shaft (6) is connected to the output shaft of the high temperature motor via a coupling (3); the lower pump body (12) adopts a circumferentially evenly distributed structure of three rods, a pump barrel (5) is installed at the lower end of the lower pump body, a pump water inlet and a pump water outlet (4) are respectively opened on both sides of the pump barrel, and a pump bottom plate (15) is installed at the bottom end of the pump barrel. The rotor (13) is installed at the rear end of the rotating shaft (6), and the pump flange (11) also has an air pipe installation hole. The air pipe passes through the installation hole on the pump flange (11) and the installation hole on the pump bottom plate and is fixed to the side of the mixing pump by bolts. The water outlet (4) of the mixing pump is an extended structure of the pump barrel, and its horizontal projection is not less than the horizontal projection of the mixing rotor. The inclination angle between it and the pump shaft is controlled between 30° and 45°. The number of blades of the pump impeller is not less than three, and the number of blades of the mixing rotor is not less than two, and both are spatial curved surface structures.

[0010] Compared with the existing agitator, this new practical agitator has the following effects:

[0011] 1. The stirring method is fully automatic in a closed environment under a protective atmosphere. When the motor rotates, the magnesium alloy melt is rotated in from the water inlet of the pump, thrown out from the water outlet of the extension pump to the lower side of the crucible, and then continued to be stirred by the stirring rotor, rather than the traditional single stirring method that easily forms a vortex, ensuring that the alloy liquid under the liquid surface is fully stirred, and can maintain the suspension and residence time of the refining agent in the alloy liquid for a long time, so that the inclusions can fully contact with the refining agent, and the refining effect is good.

[0012] 2. The refining method combining stirring and gas introduction is adopted to minimize the introduction of new impurities due to the addition of refining agent, while effectively controlling the amount of refining agent.

[0013] 3. It is better to ensure that the alloy liquid refining environment is in a sealed and air-isolated environment, with good protection effect and excellent working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1 It is a new structural schematic diagram of this utility model.

[0015] In the figure: 1. Motor 2. Flange 3. Coupling 4. Liquid outlet 5. Pump barrel 6. Rotating shaft 7. Upper pump body 8. Refining vent pipe 9. Bearing 10. Bolt 11. Pump flange 12. Lower pump body 13. Pump impeller 14. Bearing seat 15. Pump bottom plate 16. Mixing rotor. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings of the specification.

[0017] Attached Figure 1 The accompanying drawings of the embodiments are drawn in a simplified manner and are only used for the purpose of clearly and concisely illustrating the embodiments of the utility model. The following technical solutions shown in the accompanying drawings are specific solutions of the embodiments of the present invention and are not intended to limit the scope of the invention claimed for protection. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0018] In the description of the present invention, the terms "design", "fixed", and "connected" should be used in a broad sense, for example, fixed connection, detachable connection, integral connection, mechanical connection, electrical connection, direct connection, indirect connection through an intermediate medium, and internal communication between components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] The stirring pump of the utility model is composed of a high temperature resistant motor (1), a stirring pump and a refining ventilation pipe. The upper pump body (7) and the lower pump body (12) of the stirring pump body are connected through a pump flange (11). The upper pump body is a cylindrical structure and is fixed to the motor through a flange and screws (2). The bearing seat (14) is an upper and lower flange, the middle of which is a cylindrical structure sleeved in the upper pump body. The upper flange is used to fix the driving motor (1). The lower flange is connected to the pump flange (11) through screws and fixed to the crucible sealing cover. Two bearings (9) are installed in the cylinder. The rotating shaft (6) is installed in the inner hole of the bearing (9), and the rotating shaft (6) is connected to the output shaft of the high temperature motor through a coupling (3). The lower pump body (12) adopts a circumferentially evenly distributed structure of three rods. A pump barrel (5) is installed at the lower end of the lower pump body. The two sides of the pump barrel are respectively provided with a pump water inlet and a pump water outlet (4). A pump bottom plate (15) is installed at the bottom of the pump barrel. The rotor (13) is installed at the rear end of the rotating shaft (6), and the pump flange (11) also has an air pipe installation hole. The air pipe passes through the installation hole on the pump flange (11) and the installation hole on the pump bottom plate and is fixed to the side of the mixing pump by bolts. The water outlet (4) of the mixing pump is an extended structure of the pump barrel, and its horizontal projection is not less than the horizontal projection of the mixing rotor. The inclination angle between it and the pump shaft is controlled between 30° and 45°. The number of blades of the pump impeller is not less than three, and the number of blades of the mixing rotor is not less than two, and both are spatial curved surface structures.

[0020] The working process of the utility model is as follows: after the stirring pump is installed in place, the pump barrel is located in the middle and lower part of the liquid surface of the refined melt, the refining agent is added, the refining gas is introduced, the motor is started, the pump shaft rotates, the pump impeller and the stirring rotor rotate together at a suitable speed, the magnesium alloy melt is rotated in from the pump water inlet, and is thrown obliquely downward into the refining crucible from the extended pump outlet, accompanied by the stirring of the stirring rotor in the middle and lower part of the liquid surface, the refining agent is evenly dispersed and fully contacts and adsorbs the inclusions in the magnesium liquid, the refining gas is reduced in size to surround the magnesium alloy to the greatest extent, and finally, under the action of the refining agent and the refining gas, the impurity products in the magnesium alloy float or sink, and the magnesium liquid is refined.

[0021] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stirring pump for refining, characterized in that: The stirring pump is composed of a high temperature resistant motor (1), a stirring pump and a refining ventilation pipe. The upper pump body (7) and the lower pump body (12) in the stirring pump body are connected through a pump flange (11). The upper pump body is a cylindrical structure and is fixed to the high temperature resistant motor through a flange and screws (2). The bearing seat (14) is an upper and lower flange, the middle of which is a cylindrical structure sleeved in the upper pump body. The upper flange is used to fix the high temperature resistant motor (1), and the lower flange is connected to the pump flange (11) through screws. The lower pump body (12) is fixed on the crucible sealing cover, and two bearings (9) are installed in the cylinder. The rotating shaft (6) is installed in the inner hole of the bearing (9), and the rotating shaft (6) is connected to the output shaft of the high-temperature resistant motor through a coupling (3); the lower pump body (12) adopts a structure with three rods evenly distributed around the circumference, and a pump barrel (5) is installed at the lower end of the lower pump body, and a pump water inlet and a liquid outlet (4) are respectively opened on both sides of the pump barrel. A pump impeller (13) is installed in the pump barrel, and a pump base plate (15) is also installed at the bottom end.

2. A stirring pump for refining according to claim 1, characterized in that: The rear end of the rotating shaft (6) is provided with a stirring rotor (16), and the pump flange (11) is provided with a vent pipe mounting hole. The refining vent pipe passes through the mounting hole on the pump flange (11) and the mounting hole on the pump bottom plate and is fixed to the side of the stirring pump by bolts.

3. A stirring pump for refining according to claim 1, characterized in that: The liquid outlet (4) of the stirring pump is an extended structure of the pump barrel, the horizontal projection of which is not less than the horizontal projection of the stirring rotor, and the inclination angle between the liquid outlet (4) and the pump shaft is controlled between 30° and 45°.

4. A stirring pump for refining according to claim 1, characterized in that: The pump impeller has at least three blades, and the stirring rotor has at least two blades.

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