Turbine type nucleating agent mixing device

Abstract

The utility model discloses a turbo type inoculant mixing device which comprises a pouring cup, a liquid guide pipe, a shrinkage pipe, a throat pipe and a liquid outlet pipe, a direct pouring gate of the pouring cup is communicated with the shrinkage pipe through the liquid guide pipe, the throat pipe is communicated below the shrinkage pipe, and the liquid outlet pipe is communicated below the throat pipe. The throat pipe is in a turbine type, a turbine device is arranged in the throat pipe, the turbine device is composed of a center supporting cylindrical frame, cone frames and turbine blades, the cone frames are connected to the upper portion and the lower portion of the center supporting cylindrical frame respectively, and the turbine blades are fixed to the outer wall of the center supporting cylindrical frame and fixed to the inner wall of the throat pipe. The device solves the problem that the inoculant and the molten metal are not uniformly mixed, ensures that the inoculant is completely melted and uniformly absorbed by the molten metal, fully plays the role of the inoculant, and improves the quality of casting products.

Description

Technical Field

[0001] The utility model belongs to the technical field of smelting and casting equipment, and particularly relates to a turbine type inoculant mixing device. Background Art

[0002] During the casting process of large-sized castings, the microstructure is prone to be uneven, which has a great impact on the product quality. The inoculant has the function of refining the matrix structure. In order to ensure the consistency of the casting structure and product quality, during the casting process of large-sized castings, inoculation treatment is usually required. The inoculation treatment is to add a small amount of inoculant into the liquid metal to promote its nucleation and inhibit its growth, so as to achieve the refinement of crystal grains. At present, the addition methods of the inoculant mainly include the direct addition method and the cored wire addition method. The direct addition method is to directly put the inoculant into the molten metal and let it disperse in the metal, but it cannot ensure the uniform mixing of the inoculant in the metal liquid; the cored wire addition method is to wrap the inoculant in the core and then put the core into the molten metal to release and disperse the inoculant in the metal. This method is greatly affected by human factors, time-consuming and laborious, and the function of the inoculant cannot be fully exerted.

[0003] The above methods are common inoculant treatment methods, but it is difficult to ensure the complete and uniform mixing of the inoculant and the metal liquid, and the function of the inoculant cannot be effectively exerted. Therefore, it is urgent to solve the problem of uneven mixing of the inoculant and the metal liquid to improve the quality of large-sized castings. Content of the Utility Model

[0004] Aiming at the problem of uneven mixing of the inoculant and the metal liquid existing in the prior art, the utility model provides a turbine type inoculant mixing device to solve the problem that the inoculant cannot be evenly distributed in the metal liquid under the above background art, so that the inoculant is evenly dispersed in the metal liquid.

[0005] The purpose of the utility model is achieved in the following way:

[0006] A turbine type inoculant mixing device includes a pouring cup, a liquid guide pipe, a contraction pipe, a throat pipe and a liquid outlet pipe. The straight gate of the pouring cup is connected to the contraction pipe through the liquid guide pipe. The contraction pipe is connected to the throat pipe below, and the throat pipe is connected to the liquid outlet pipe below; the throat pipe is of a turbine type and is internally provided with a turbine device. The turbine device is composed of a central support cylinder frame, a conical frame and turbine blades. The central support cylinder frame is connected with a conical frame at both the upper and lower parts. The turbine blades are fixed on the outer wall of the central support cylinder frame and are fixed to the inner wall of the throat pipe.

[0007] The liquid outlet pipe is a diffuser pipe or a contraction pipe.

[0008] The lower end of the liquid outlet pipe is connected to an outlet circular pipe.

[0009] The inclination angle of the turbine blades is 30° ≤ α ≤ 45°.

[0010] The inclined length of the turbine blade is 10 mm ≤ L ≤ 30 mm.

[0011] The number of turbine blades is 6 - 12.

[0012] The sprue cup is in the shape of a gourd.

[0013] The liquid guide pipe and the upper contraction pipe are connected by a fastening ring.

[0014] The utility model has the advantages of simple structure, convenient operation and low cost. The sprue cup is in the shape of a gourd, and the protruding part in the middle of the sprue cup can filter residues in the molten metal. The cross-sectional area of the outlet of the contraction pipe decreases, and the flow rate of the molten metal increases when flowing through it, which can enhance the eddy current effect formed subsequently; the molten metal with changed flow rate flows into the throat pipe. When flowing through the turbine device, its streamline is distorted and changed. At the same time, affected by the shape and structure of the turbine device, the flow rate of the molten metal further increases, and the turbulence degree of the liquid increases. After flowing through the turbine blade, an eddy current is formed. Under the action of the rotating eddy current generated by flowing through the turbine, the mixing process of the inoculant and the molten metal can be strengthened. This rotating eddy current improves the turbulence degree inside the liquid, which helps the inoculant particles to be more evenly distributed in the molten metal; the liquid eddy current formed by the molten metal under the action of the turbine device then flows through the liquid outlet pipe and finally into the sprue. During this process, the flow path of the eddy current is long, and the mixing time of the inoculant and the molten metal under the action of the eddy current is sufficient. In the sprue, the eddy current further promotes the uniform mixing of the inoculant and the molten metal. Finally, the inoculant is fully melted and evenly absorbed by the molten metal. The special structure composed of the contraction pipe, the throat pipe and the liquid outlet pipe results in a large flow rate at the throat pipe, and the inoculant quickly passes through the throat pipe and the turbine device, preventing the inoculant from adhering to the inner wall of the throat pipe or the turbine device. Compared with the traditional in-stream inoculation method, the turbine-type inoculant mixing device disclosed by the utility model can ensure that the inoculant is completely melted and evenly absorbed by the molten metal, can give full play to the role of the inoculant, and improve the quality of the casting product. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the utility model in which the liquid outlet pipe is a diffuser pipe.

[0016] Figure 2 It is a schematic structural diagram of the utility model in which the liquid outlet pipe is a contraction pipe.

[0017] Figure 3 It is a schematic structural diagram of the sprue cup.

[0018] Figure 4 It is a schematic structural diagram of the throat pipe.

[0019] Figure 5 It is a schematic structural diagram of the turbine inside the throat pipe.

[0020] In the figure, 1 is a pouring cup; 2 is a liquid guide pipe; 21 is a fastening ring; 4 is a shrinkage pipe; 5 is a throat pipe; 6 is a turbine device; 61 is a central support cylindrical frame; 62 is a conical frame; 611 are turbine blades; 7 is a liquid outlet pipe; 8 is an outlet circular pipe. Specific embodiments

[0021] In order to more clearly demonstrate the technical solutions and advantages of the present utility model, the present utility model will be described more clearly and in detail below with reference to the accompanying drawings and through specific embodiments. The described embodiments are only a part of the embodiments designed by the present utility model, not all of the embodiments.

[0022] As Figure 1 , Figure 2 , Figure 4 and Figure 5 shown, a turbine-type inoculant mixing device includes a pouring cup 1, a liquid guide pipe 2, a shrinkage pipe 4, a throat pipe 5 and a liquid outlet pipe 7. The straight gate of the pouring cup 1 is connected to the shrinkage pipe 4 through the liquid guide pipe 2. The shrinkage pipe 4 is connected to the throat pipe 5 below, and the throat pipe 5 is connected to the liquid outlet pipe 7 below; the throat pipe 5 is of a turbine type and is internally provided with a turbine device 6. The turbine device 6 is composed of a central support cylindrical frame 61, a conical frame 62 and turbine blades 611. A conical frame 62 is connected to each of the upper and lower parts of the central support cylindrical frame 61. The turbine blades 611 are fixed on the outer wall of the central support cylindrical frame 61 and are fixedly connected to the inner wall of the throat pipe 5. The conical structure of the conical frame 62 can guide the flow of the molten metal. In addition, the presence of the conical structure will disturb the streamline of the molten metal. When the molten metal flows through the conical frame 62, due to its shape characteristics, the streamline will be distorted, which promotes the formation of liquid eddies. At the same time, the conical frame 62 reduces the flow space of the liquid. The molten metal flows from the shrinkage pipe 4, and the fluid will flow further accelerated at the conical frame 62 to adapt to the gradually narrowing channel.

[0023] A further preferred solution is that the liquid outlet pipe 7 is a diffuser pipe with a smaller diameter at the top and a larger diameter at the bottom, or a shrinkage pipe with a larger diameter at the top and a smaller diameter at the bottom.

[0024] As Figure 1As shown, when the liquid outlet pipe 7 is a diffuser pipe with a smaller diameter at the top and a larger diameter at the bottom, the special structure composed of the contraction pipe, the throat pipe, and the diffuser pipe causes the flow velocity at the throat pipe to be the maximum, enabling the inoculant to quickly pass through the throat pipe and the turbine device, preventing the inoculant from adhering to the inner wall of the throat pipe or the turbine device. At the same time, the special structure composed of the contraction pipe, the throat pipe, and the diffuser pipe will form a local negative pressure area at the throat position when the liquid flows through, and this negative pressure area can attract the entry of the inoculant, promoting the mixing of the inoculant and the molten metal. This structure also helps to separate the bubbles from the liquid and remove the gas in the liquid. Specifically, when the molten metal flows from the contraction pipe into the throat pipe, the liquid flow velocity increases, and the increase in the flow velocity will cause the pressure to decrease, and the gas will be released from the liquid to form bubbles. When the molten metal flows into the diffuser pipe, the pressure recovers, and the bubbles will separate from the molten metal and rise towards the negative pressure area, thereby discharging the bubbles out of the system and reducing the bubble content in the molten metal. After the molten metal flows through the turbine blades 611 and continues to flow through the diffuser pipe, the molten metal may decelerate to adapt to the widened pipe, and the change and gradient of the flow velocity of the molten metal caused by passing through the contraction pipe and the liquid outlet pipe contribute to further promoting the continuous formation of the vortex and enhancing the vortex effect.

[0025] As Figure 2 shown, when the liquid outlet pipe 7 is a contraction pipe with a larger diameter at the top and a smaller diameter at the bottom, after the liquid passes through the first contraction pipe, the flow velocity increases, and then it passes through the second contraction pipe, and the flow velocity is further increased. The periodic change of the flow velocity will enhance the formation effect of the vortex and contribute to the mixing of the liquid and the inoculant.

[0026] Furthermore, the lower end of the liquid outlet pipe 7 is connected to the outlet circular pipe 8, and the diameter of the outlet circular pipe 8 is adapted to the diameter of the sprue, which is more conducive to the entry of the inoculant and the molten metal into the sprue.

[0027] In a further preferred embodiment, the pouring cup 1 is in the shape of a gourd. See Figure 3 , the pouring cup 1 has a solution pool and a sprue. The molten metal is poured from one end of the pouring cup away from the sprue. The middle protrusion of the gourd shape can filter out residues in the molten metal, and the molten metal flows downward from the sprue into the liquid guiding pipe 2.

[0028] The liquid guiding pipe 2 and the upper contraction pipe 4 are connected by a fastening ring 21 to achieve the installation stability between the pipes during operation.

[0029] The inclination angle of the turbine blade 611 is 30° ≤ α ≤ 45°. As the inclination angle of the turbine blade 611 increases, the rotational speed of the molten metal after flowing through the turbine blade will increase, thereby increasing the diameter of the formed vortex, enhancing the vortex effect, and improving the fluid mixing effect.

[0030] The inclined length of the turbine blade 611 is 10 mm ≤ L ≤ 30 mm. The increase in the inclined length of the turbine blade can increase the turbulence effect of the blade on the molten metal, thereby enhancing the eddy current intensity. In addition, the increase in the blade inclined length can adjust the diameter of the eddy current. Longer blades will form eddy currents with larger diameters to enhance the eddy current effect.

[0031] The number of turbine blades 611 is 6 - 12. Appropriately increasing the number of turbine blades will enhance the turbulence of the liquid, improve the eddy current effect, and thus enhance the mixing effect of the molten metal and the inoculant. However, too many turbine blades may reduce the speed of the eddy current. The resistance that the liquid needs to overcome when flowing through the blades increases, and the energy consumption increases.

[0032] The structure of the utility model is simple, easy to operate, and has a low cost. During casting, the molten metal is poured from the pouring cup. The middle protruding part of the gourd-shaped pouring cup plays a filtering role, which can effectively remove inclusions and residues in the molten metal. The molten metal flows from the solution pool of the pouring cup 1 into the sprue, and then the molten metal enters the contraction pipe 4 through the liquid guide pipe 2. Since the cross-sectional area of the contraction pipe 4 decreases, the flow rate of the molten metal increases to adapt to the gradually decreasing cross-sectional area of the pipe. The increase in the liquid flow rate leads to an increase in the turbulence of the liquid after flowing through the throat pipe 5, which can promote the formation of eddy currents and enhance the eddy current effect. Subsequently, the molten metal with an increased flow rate after passing through the contraction pipe 4 flows into the throat pipe 5. A turbine device 6 is arranged in the throat pipe 5. Affected by the conical frame 62 and the turbine blades 611, the liquid streamline is distorted and changes. Finally, an eddy current is formed after flowing through the turbine blades 611. Under the action of the rotating eddy current, the mixing process of the inoculant and the molten metal is strengthened. This rotating eddy current increases the turbulence degree inside the liquid, which helps the inoculant particles to be more evenly distributed in the molten metal. The liquid eddy current formed by the molten metal under the action of the turbine device then flows through the liquid outlet pipe and finally into the sprue runner. During this process, the flow path of the eddy current is long, and the inoculant and the molten metal have sufficient time to be evenly mixed under the action of the eddy current. In the sprue runner, the eddy current further promotes the uniform mixing of the inoculant and the molten metal. Finally, the inoculant is fully melted and evenly absorbed by the molten metal.

[0033] The special structure composed of the contraction pipe, the throat pipe, and the liquid outlet pipe results in the liquid flow rate at the throat pipe being greater than the initial speed, enabling the inoculant to quickly pass through the throat pipe and the turbine device, preventing the inoculant from adhering to the inner wall of the throat pipe or the turbine device.

[0034] Compared with the traditional in-stream inoculation method, the inoculant added through the mixing device disclosed by the present utility model can be completely melted and uniformly absorbed by the molten metal, which can give full play to the role of the inoculant and improve the quality of the casting products. In addition, since the internal turbine blades of the turbine throat can change the tilt angle, the blade tilt length, and the number of blades, the eddy current effect of the molten metal after flowing through the blades can be controlled, and the uniform mixing effect of the inoculant and the molten metal can be controlled, further ensuring the uniform mixing of the inoculant and the molten metal, the full melting and uniform absorption of the inoculant, and ensuring the quality of the casting.

[0035] The above are only the preferred embodiments of the present utility model. It should be noted that for those skilled in the art, without departing from the overall concept of the present utility model, several changes and improvements can still be made, and these should also be regarded as the protection scope of the present utility model.

Claims

1. A turbo-type inoculant mixing device, characterized in that: It includes a pouring cup (1), a liquid guide pipe (2), a contraction pipe (4), a throat pipe (5) and a liquid outlet pipe (7). The sprue of the pouring cup (1) is connected to the contraction pipe (4) through the liquid guide pipe (2). The contraction pipe (4) is connected to the throat pipe (5) below, and the throat pipe (5) is connected to the liquid outlet pipe (7) below; the throat pipe (5) is of a turbine type and is internally provided with a turbine device (6). The turbine device (6) is composed of a central support cylindrical frame (61), a conical frame (62) and turbine blades (611). A conical frame (62) is connected to each of the upper and lower parts of the central support cylindrical frame (61). The turbine blades (611) are fixed on the outer wall of the central support cylindrical frame (61) and are fixed to the inner wall of the throat pipe (5).

2. The turbo-type inoculant mixing device according to claim 1, wherein: The liquid outlet pipe (7) is a diffuser pipe or a contraction pipe.

3. The turbo-type inoculant mixing device according to claim 2, wherein: The lower end of the liquid outlet pipe (7) is connected to an outlet circular pipe (8).

4. The turbo-type inoculant mixing device according to claim 1, wherein: The inclination angle of the turbine blades (611) is 30° ≤ α ≤ 45°.

5. The turbo-type inoculant mixing device according to claim 1, characterized in that: The inclined length of the turbine blades (611) is 10 mm ≤ L ≤ 30 mm.

6. The turbo-type inoculant mixing device according to claim 1, characterized in that: The number of the turbine blades (611) is 6 - 12.

7. The turbo-type inoculant mixing device according to claim 1, characterized in that: The pouring cup (1) is in a gourd shape.

8. The turbo-type inoculant mixing device according to claim 1, wherein: The liquid guide pipe (2) is connected to the upper contraction pipe (4) through a fastening ring (21).

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