Flow control valve suitable for ultrahigh-temperature molten steel

Abstract

The invention discloses a flow control valve suitable for ultrahigh-temperature molten steel, which belongs to the field of ultrahigh-temperature valves and comprises a main valve body, a graphite lining, a lining fixing cover plate, an upper plate cover, a lower plate cover and a fireproof valve plate. The graphite lining layer, the ceramic heat insulation layer and the hollow convection layer are designed in the whole valve to achieve gradient heat regulation and control, heat dissipation of the valve body and electrical elements is effectively achieved (the valve body is made of 310S stainless steel, and the heat resistance limit is 1200 DEG C), the internal temperature is kept constant (the temperature of the inner wall of the graphite lining is larger than 1600 DEG C), and molten steel condensation is avoided. The inclined fire-resistant valve plate is adopted as a core adjusting element and is matched with the graphite lining, so that adhesion of molten steel on the plate surface can be reduced in the process of adjusting the flow of the molten steel, and the service life is prolonged.

Description

Technical Field

[0001] This invention relates to the field of ultra-high temperature valves, and more specifically to a flow control valve suitable for ultra-high temperature molten steel (1700℃). Background Technology

[0002] In the steel smelting and casting process, the flow rate of molten steel and the pouring speed directly affect the integrity of the mold filling and the internal quality of the casting, making them core control parameters in the casting process. A fast filling speed reduces metal oxidation, facilitates simultaneous solidification, and reduces shrinkage cavities. However, excessively high flow rates can severely impact the mold, easily entrapping gas and leading to defects such as porosity and slag inclusions. Insufficient flow rates intensify the baking effect of the molten metal on the mold, easily causing surface defects such as sand inclusions and sand adhesion, and may even lead to incomplete filling.

[0003] Currently, the main problems are as follows:

[0004] Existing methods mostly use graphite stoppers and submerged entry nozzles to control the flow rate of molten steel. However, these methods have drawbacks such as poor control effect, reliance on the operator's skill level, and a tendency for the graphite stoppers to break, which can lead to casting accidents and affect the quality of castings.

[0005] Control valves are core terminal components in industrial automation, capable of precisely regulating the flow rate and velocity of different media. However, traditional high-temperature control valves are prone to material creep and oxidation deformation under extreme conditions (1700℃ molten steel), leading to increased wear and adhesion of the sealing surface, resulting in problems such as leakage and jamming.

[0006] Therefore, optimizing the overall structure and developing ultra-efficient heat insulation structures and methods have become key technical challenges that engineers in the field of ultra-high temperature valves urgently need to address. Summary of the Invention

[0007] In view of this, the present invention provides a flow control valve suitable for ultra-high temperature molten steel at 1700℃.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A flow control valve for ultra-high temperature molten steel includes a main valve body, a graphite liner, a liner fixing cover, an upper cover, a lower cover, and a fire-resistant valve plate. The upper end face of the main valve body is designed with a standard flange hole, which is connected to the bottom of the ladle. The graphite liner is fixed to the inner surface of the main valve body by liner fixing bolts and liner fixing nuts; the liner fixing cover plate is fixed to the top of the main valve body by cover plate fixing screws. Both the main valve body and the graphite liner are provided with rhomboid holes, and the rhomboid holes of the main valve body and the graphite liner correspond to each other. Both the upper cover and the lower cover are welded and fixed inside the rhomboid hole, and the upper cover and the lower cover together form a hollow cavity. The upper cover and the lower cover are fixedly connected by cover screws. The fire-resistant valve plate is fixed in the hollow cavity by valve plate fixing bolts and valve plate fixing nuts, and the bottom end of the fire-resistant valve plate extends into the interior of the graphite lining. An electric push rod is provided on the outer surface of the lower plate cover. The electric push rod is fixed to the lower plate cover by push rod fixing bolts and push rod fixing nuts. The electric push rod is arranged parallel to the fire-resistant valve plate, and the top end of the electric push rod is located on the same vertical plane as the top end of the fire-resistant valve plate. The top of the electric push rod is provided with a push rod connecting plate. One end of the push rod connecting plate is fixedly connected to the top of the electric push rod by screws, and the other end of the push rod connecting plate is connected to the top of the fire-resistant valve plate by screws.

[0009] The main valve body has four shoulders on its inner wall, which form a natural convection layer and facilitate the fixing of the inner lining fixing plate, ceramic heat insulation plate and graphite inner lining. The end face of the graphite inner lining is pressed tightly against the bottom of the ladle and coated with refractory paint to prevent molten steel from leaking from the gaps.

[0010] Furthermore, an inner liner fixing plate is fixedly provided between the main valve body and the graphite liner; there is a gap between the inner liner fixing plate and the main valve body to form a natural convection layer; the inner liner fixing plate is provided with rhomboid holes, which correspond to the rhomboid holes on the main valve body.

[0011] Furthermore, a ceramic heat insulation plate is fixed between the inner lining fixing plate and the graphite inner lining; the ceramic heat insulation plate is provided with rhomboid holes, which correspond to the rhomboid holes on the main valve body.

[0012] Furthermore, a guide steel strip is also provided; the guide steel strip is fixedly attached to the surface of the fire-resistant valve plate and secured by valve plate fixing bolts and valve plate fixing nuts. The lower cover plate and the guide steel strip are fitted with a clearance fit to guide the movement of the fire-resistant valve plate.

[0013] The refractory valve plate is connected to the electric push rod via a push rod connecting plate. During operation, the electric push rod drives the refractory valve plate to adjust the molten steel flow. The surface of the valve plate in contact with the molten steel is coated with an anti-adhesion coating. The valve plate is designed as an inclined plate. During the adjustment process, some of the molten steel on the valve plate will slide off automatically due to gravity. In addition, in conjunction with the graphite lining, some stubbornly adhered molten steel can be scraped off by the graphite lining, thereby improving the service life of the valve plate.

[0014] Furthermore, the inner lining fixing cover plate has several heat dissipation holes on its surface to accelerate natural convection heat dissipation.

[0015] Furthermore, the refractory valve plate is made by molding and firing magnesia-carbon bricks as the main material. It can withstand ultra-high temperatures and has good adjustment stability in molten steel media at 1700℃.

[0016] Furthermore, the refractory valve plate and the graphite lining have a thermal expansion deformation gap, preventing direct contact and reducing friction. At high temperatures, the graphite lining expands, compensating for the gap, and some stubbornly adhered molten steel can be scraped off by the graphite lining, thus improving the service life of the valve plate. Furthermore, several heat sinks are welded and fixed to the outer surfaces of both the upper and lower cover plates.

[0017] Furthermore, an inclined plate is provided on the outer surface of the lower cover, the inclined plate is perpendicular to the moving direction of the fire-resistant valve plate, and the electric push rod is fixed on the inclined plate.

[0018] The beneficial effects of this invention are as follows: The present invention uses a graphite liner, a ceramic insulation layer, and a hollow convection layer to achieve gradient thermal regulation of the valve body, effectively heat dissipation of the valve body and electrical components (the valve body is made of 310S stainless steel with a heat resistance limit of 1200℃), and maintains a constant internal temperature (the inner wall temperature of the graphite liner is >1600℃), thus preventing the molten steel from condensing.

[0019] This invention uses an inclined refractory valve plate as the core regulating element, which, in conjunction with a graphite lining, can reduce the adhesion of molten steel to the plate surface during the process of regulating the flow rate of molten steel, thereby improving its service life. Attached Figure Description

[0020] Figure 1 This is a front sectional view of the flow control valve for molten steel at 1700℃ provided by the present invention. Figure 2 This is a front view of the flow control valve for molten steel at 1700℃ provided by the present invention; Figure 3 This is a front sectional view of the flow control valve for molten steel at 1700℃ provided by the present invention. Figure 4 This is a top view of the flow control valve for molten steel at 1700℃ provided by the present invention; Figure 5 This is a three-dimensional side view of the flow control valve for molten steel at 1700℃ provided by the present invention; Figure 6 This is a three-dimensional side view of the graphite liner of the present invention; Figure 7 This is a three-dimensional side view of the ceramic heat insulation plate of the present invention; Figure 8 This is a three-dimensional side view of the inner lining fixing plate of the present invention; Figure 9 These are a three-dimensional side view and a two-dimensional sectional view of the main valve body of the present invention; Figure 10 This is a three-dimensional side view of the fire-resistant valve plate of the present invention; Figure 11 This is a schematic diagram of the refractory valve plate of the present invention for adjusting the flow rate of molten steel; Figure 12 This is a schematic diagram of the refractory valve plate of the present invention for adjusting the direction of molten steel movement; Figure 13 This is a three-dimensional side view of the upper cover of the present invention; Figure 14 This is a three-dimensional side view of the lower cover of the present invention.

[0021] In the attached diagram, the structures indicated by each number are as follows: 1-Main valve body, 2-Graphite lining, 3-Liner fixing cover plate, 4-Upper plate cover, 5-Lower plate cover, 6-Fire-resistant valve plate, 7-Electric push rod, 8-Push rod connecting plate, 9-Liner fixing plate, 10-Ceramic heat insulation plate; 11-Rhomboid hole; 21-Inner liner fixing bolt; 22-Inner liner fixing nut; 31-Cover plate fixing screw; 51-Panel cover screw, 52-Heat sink, 53-Slanted plate; 61-Valve plate fixing bolt, 62-Valve plate fixing nut, 63-Guide steel bar; 71-Push rod fixing bolt, 72-Push rod fixing nut; 81-Screw. Detailed Implementation

[0022] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 this invention 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 invention.

[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 this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] Example A flow control valve for ultra-high temperature molten steel includes a main valve body 1, a graphite liner 2, a liner fixing cover plate 3, an upper cover plate 4, a lower cover plate 5, and a fire-resistant valve plate 6. The graphite liner 2 is fixed to the inner surface of the main valve body 1 by the liner fixing bolts 21 and the liner fixing nuts 22; the liner fixing cover plate 3 is fixed to the top of the main valve body 1 by the cover plate fixing screws 31. Both the main valve body 1 and the graphite liner 2 are provided with rhomboid holes 11, and the rhomboid holes of the main valve body 1 and the graphite liner 2 correspond to each other. The upper cover 4 and the lower cover 5 are both welded and fixed in the rhomboid hole 11, and the upper cover 4 and the lower cover 5 are combined to form a hollow cavity. The upper cover 4 and the lower cover 5 are fixedly connected by cover screws 51. The fire-resistant valve plate 6 is fixed in the hollow cavity by valve plate fixing bolts 61 and valve plate fixing nuts 62, and the bottom end of the fire-resistant valve plate 6 extends into the interior of the graphite liner 2. An electric push rod 7 is provided on the outer surface of the lower plate cover 5. The electric push rod 7 is fixed to the lower plate cover 5 by push rod fixing bolt 71 and push rod fixing nut 72. The electric push rod 7 is arranged parallel to the fire resistant valve plate 6, and the top of the electric push rod 7 and the top of the fire resistant valve plate 6 are located on the same vertical plane. The top of the electric push rod 7 is provided with a push rod connecting plate 8. One end of the push rod connecting plate 8 is fixedly connected to the top of the electric push rod 7 by screws 81, and the other end of the push rod connecting plate 8 is connected to the top of the fire-resistant valve plate 6 by screws 81.

[0027] In some embodiments, an inner liner fixing plate 9 is also fixed between the main valve body 1 and the graphite inner liner 2; there is a gap between the inner liner fixing plate 9 and the main valve body 1 to form a natural convection layer; the inner liner fixing plate 9 is provided with rhomboid holes 11, which correspond to the rhomboid holes 11 on the main valve body 1.

[0028] In some other embodiments, a ceramic heat insulation plate 10 is also fixed between the inner lining fixing plate 9 and the graphite inner lining 2; the ceramic heat insulation plate 10 is provided with rhomboid holes 11, which correspond to the rhomboid holes 11 on the main valve body 1.

[0029] In some embodiments, a guide steel strip 63 is also provided; the guide steel strip 63 is fixedly attached to the surface of the fire-resistant valve plate 6 and fixed by the valve plate fixing bolt 61 and the valve plate fixing nut 62.

[0030] In some embodiments, the inner lining fixing cover plate 3 has a plurality of heat dissipation holes on its surface.

[0031] In some embodiments, the refractory valve plate 6 is made by molding and firing magnesia-carbon bricks as the main material.

[0032] In some embodiments, there is a thermal expansion deformation gap between the fire-resistant valve plate 6 and the graphite liner 2.

[0033] In some embodiments, a plurality of heat sinks 52 are welded and fixed to the outer surfaces of the upper cover 4 and the lower cover 5.

[0034] In some other embodiments, an inclined plate 53 is provided on the outer surface of the lower cover 5. The inclined plate 53 is perpendicular to the moving direction of the fire-resistant valve plate 6, and the electric push rod 7 is fixed on the inclined plate 53.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a 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 invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0036] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A flow control valve suitable for ultra-high temperature molten steel, characterized in that, Includes main valve body, graphite liner, liner fixing cover plate, upper cover plate, lower cover plate, and fire-resistant valve plate; The graphite liner is fixed to the inner surface of the main valve body by liner fixing bolts and liner fixing nuts; the liner fixing cover plate is fixed to the top of the main valve body by cover plate fixing screws. Both the main valve body and the graphite liner are provided with rhomboid holes, and the rhomboid holes of the main valve body and the graphite liner correspond to each other; Both the upper cover and the lower cover are welded and fixed inside the rhomboid hole, and the upper cover and the lower cover together form a hollow cavity. The upper cover and the lower cover are fixedly connected by cover screws. The fire-resistant valve plate is fixed in the hollow cavity by valve plate fixing bolts and valve plate fixing nuts, and the bottom end of the fire-resistant valve plate extends into the interior of the graphite lining. An electric push rod is provided on the outer surface of the lower plate cover. The electric push rod is fixed to the lower plate cover by push rod fixing bolts and push rod fixing nuts. The electric push rod is arranged parallel to the fire-resistant valve plate, and the top end of the electric push rod is located on the same vertical plane as the top end of the fire-resistant valve plate. The top of the electric push rod is provided with a push rod connecting plate. One end of the push rod connecting plate is fixedly connected to the top of the electric push rod by screws, and the other end of the push rod connecting plate is connected to the top of the fire-resistant valve plate by screws.

2. The flow control valve for ultra-high temperature molten steel according to claim 1, characterized in that, An inner liner fixing plate is also fixed between the main valve body and the graphite liner; there is a gap between the inner liner fixing plate and the main valve body to form a natural convection layer; the inner liner fixing plate is provided with rhomboid holes, which correspond to the rhomboid holes on the main valve body.

3. The flow control valve for ultra-high temperature molten steel according to claim 2, characterized in that, A ceramic heat insulation plate is also fixed between the inner lining fixing plate and the graphite inner lining; the ceramic heat insulation plate is provided with rhomboid holes, which correspond to the rhomboid holes on the main valve body.

4. The flow control valve for ultra-high temperature molten steel according to claim 1, characterized in that, It is also provided with guide steel bars; the guide steel bars are fixedly attached to the surface of the fire-resistant valve plate and fixed by valve plate fixing bolts and valve plate fixing nuts.

5. The flow control valve for ultra-high temperature molten steel according to claim 1, characterized in that, The inner lining fixing cover plate has several heat dissipation holes on its surface.

6. A flow control valve for ultra-high temperature molten steel according to claim 1, characterized in that, The refractory valve plate is made by molding and firing magnesia-carbon bricks as the main material.

7. A flow control valve for ultra-high temperature molten steel according to claim 1, characterized in that, There is a gap between the fire-resistant valve plate and the graphite lining due to thermal expansion deformation.

8. A flow control valve for ultra-high temperature molten steel according to claim 1, characterized in that, Several heat sinks are welded and fixed to the outer surfaces of both the upper and lower cover plates.

9. A flow control valve for ultra-high temperature molten steel according to claim 1 or 8, characterized in that, The outer surface of the lower cover is provided with an inclined plate, which is perpendicular to the moving direction of the fire-resistant valve plate, and the electric push rod is fixed on the inclined plate.

Images