Reinforced silicon nitride nozzle groove refractory brick

Abstract

The utility model relates to the technical field of water gap groove refractory bricks, in particular to a reinforced silicon nitride water gap groove refractory brick which comprises a refractory brick body, a liquid inlet hole groove is formed in the center of the top face of the refractory brick body, a flow guide center disc is arranged in the center of the liquid inlet hole groove, and a first fillet is arranged at the joint of the hole wall and the bottom face of the liquid inlet hole groove. A water gap through groove is formed in the refractory brick body in a penetrating mode, and a thread groove is formed in the curved surface of the water gap through groove. According to the reinforced silicon nitride nozzle groove refractory brick, according to the liquid inlet hole groove and the nozzle through groove formed in the refractory brick body, after molten steel is poured into the liquid inlet hole groove, the molten steel is rapidly guided into the water inlet through groove through the flow guide center disc on the liquid inlet hole groove, gathering of vortexes and inclusions is reduced, and meanwhile, according to the first filleted corner and the second filleted corner, the molten steel can be rapidly guided into the water inlet through groove through the first filleted corner and the second filleted corner. Molten steel in the liquid inlet hole groove can be quickly discharged out of the water outlet through groove, and the time of the molten steel staying in the liquid inlet hole groove is shortened.

Description

Technical Field

[0001] This utility model relates to the technical field of refractory bricks with sprue grooves, specifically a reinforced silicon nitride refractory brick with sprue grooves. Background Technology

[0002] The refractory brick at the sprue is a core refractory material used in high-temperature industries such as iron and steel and non-ferrous metals to control the flow of molten steel. The sprue brick is embedded in the bottom brick of the steel ladle to form the outlet of molten steel. The upper opening is curved to reduce resistance, and the lower section is a straight section to stabilize the flow.

[0003] Common refractory bricks with sprue grooves guide the flow of molten steel through a central sprue groove. However, the overall channel may be a single channel or two symmetrically distributed channels. When multiple sprue groove channels are set, some molten steel tends to stagnate at the top when it flows into the sprue groove channel. At the same time, when assembling and fixing the refractory bricks with sprue grooves, gaps may develop over long-term use due to the single method of fixing the connection by embedding.

[0004] An innovative design was developed based on the existing reinforced silicon nitride refractory brick. Utility Model Content

[0005] The purpose of this invention is to provide a reinforced silicon nitride gate refractory brick to solve the problem mentioned in the background art that, when multiple gate channels are provided, some molten steel tends to stagnate at the top of the gate channels.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a reinforced silicon nitride refractory brick with a water inlet groove, comprising a refractory brick body, wherein a liquid inlet groove is provided at the center of the top surface of the refractory brick body, and a flow guiding center plate is provided at the center of the liquid inlet groove; a first rounded corner is provided at the junction of the hole wall and the bottom surface of the liquid inlet groove; a water inlet through groove is provided through the interior of the refractory brick body, and a threaded groove is provided on the curved surface of the water inlet through groove; a second rounded corner is provided at the junction of the top of the water inlet through groove and the bottom surface of the liquid inlet groove; and a third rounded corner is provided at the junction of the bottom of the water inlet through groove and the bottom surface of the refractory brick body.

[0007] Preferably, the refractory brick body and the flow guiding center disk are integrated into one structure, and the top diameter of the flow guiding center disk is smaller than the bottom diameter of the flow guiding center disk. The planar distance from the flow guiding center disk to the diameter of the first rounded corner is equal to the maximum diameter of the second rounded corner. The refractory brick body is made of silicon nitride substrate.

[0008] Preferably, the internal space of the liquid inlet groove is connected to the internal space of the water outlet through groove, and the height of the liquid inlet groove is greater than the height of the guide center plate.

[0009] Preferably, the water inlet channels are distributed at equal angles on the refractory brick body, and the diameter of the water inlet channels decreases from top to bottom, and the surface of the water inlet channels is provided with an anti-oxidation coating.

[0010] Preferably, the internal space of the threaded groove is interconnected with the internal space of the sprue through groove, and the cross-section of the threaded groove is set with a "V" shaped structure, and the surface of the threaded groove is made of silon bonded phase.

[0011] Preferably, the outer side of the refractory brick body is provided with a combined square groove, and a supporting square frame is installed inside the combined square groove. The combined square groove is symmetrically distributed on the refractory brick body, and the connection between the combined square groove and the supporting square frame is embedded and fixed. The outer surface of the frame of the supporting square frame is flush with the outer surface of the refractory brick body.

[0012] Compared with the prior art, the beneficial effects of this utility model are: this reinforced silicon nitride sprue groove refractory brick,

[0013] 1. Based on the liquid inlet groove and water inlet through groove set on the refractory brick body, it is convenient for molten steel to be poured into the liquid inlet groove and then quickly guided into the water inlet through groove through the guide center plate on the liquid inlet groove, reducing the accumulation of eddies and inclusions. At the same time, based on the first rounded corner and the second rounded corner, it is convenient for molten steel in the liquid inlet groove to be quickly discharged into the water inlet through groove, and the time when molten steel stays in the liquid inlet groove is reduced.

[0014] 2. The curved surface of the water inlet through channel is provided with a threaded groove. The cross-section of the threaded groove is set with a "V" shape. According to the spiral structure, the molten steel will generate axial rotation flow, reduce the local turbulence intensity. When the molten steel moves in the spiral groove, the inclusions are gathered to the outside by centrifugal force and finally discharged through the gap of the channel wall.

[0015] 3. The side of the refractory brick body is provided with a combination square groove and a support square frame. The support square frame can be combined with external clamping components to embed the refractory brick body into the bottom seat brick of the steel ladle to form the steel flow outlet. With the help of auxiliary tools, the stability after installation can be improved, and the phenomenon of gap loosening caused by long-term use or external factors can be reduced. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0017] Figure 2 This utility model Figure 1 Enlarged structural diagram at point A in the middle;

[0018] Figure 3 This is a three-dimensional structural diagram of the entire utility model from an upward perspective;

[0019] Figure 4 This utility model Figure 3 Enlarged structural diagram at point B;

[0020] Figure 5 This is a schematic diagram of the overall cross-sectional three-dimensional structure of this utility model;

[0021] Figure 6 This utility model Figure 5 Enlarged structural diagram at point C.

[0022] In the figure: 1. Refractory brick body; 2. Liquid inlet groove; 3. Flow guide center plate; 4. First rounded corner; 5. Water inlet through groove; 6. Threaded groove; 7. Second rounded corner; 8. Third rounded corner; 9. Combined square groove; 10. Supporting square frame. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1 to 6 This utility model provides a technical solution: a reinforced silicon nitride refractory brick with a water inlet groove, comprising a refractory brick body 1, a liquid inlet groove 2 is provided at the center of the top surface of the refractory brick body 1, and a flow guide center plate 3 is provided at the center of the liquid inlet groove 2. A first rounded corner 4 is provided at the junction of the hole wall and the bottom surface of the liquid inlet groove 2. A water inlet through groove 5 is provided through the interior of the refractory brick body 1, and a threaded groove 6 is provided on the curved surface of the water inlet through groove 5. A second rounded corner 7 is provided at the junction of the top end of the water inlet through groove 5 and the bottom surface of the liquid inlet groove 2, and a third rounded corner 8 is provided at the junction of the bottom end of the water inlet through groove 5 and the bottom surface of the refractory brick body 1.

[0025] The refractory brick body 1 and the flow guiding center plate 3 are integrated into one structure. The top diameter of the flow guiding center plate 3 is smaller than the bottom diameter of the flow guiding center plate 3. The planar distance between the flow guiding center plate 3 and the diameter of the first rounded corner 4 is equal to the maximum diameter of the second rounded corner 7. The refractory brick body 1 is made of silicon nitride substrate. The molten steel entering the liquid inlet groove 2 can be guided by the structure of the flow guiding center plate 3 to prevent the molten steel from staying in the central area of ​​the liquid inlet groove 2.

[0026] The internal space of the liquid inlet groove 2 is connected to the internal space of the water outlet through groove 5, and the height of the liquid inlet groove 2 is greater than the height of the guide center plate 3. The molten steel inside the liquid inlet groove 2 can flow into the water outlet through groove 5. Furthermore, the second rounded corner 7 set between the liquid inlet groove 2 and the water outlet through groove 5 facilitates rapid flow into the working process and increases service life.

[0027] The water inlet channels 5 are distributed at equal angles on the refractory brick body 1, and the diameter of the water inlet channels 5 decreases from top to bottom. Furthermore, an anti-oxidation coating is provided on the surface of the water inlet channels 5. Based on the distribution of the water inlet channels 5 on the refractory brick body 1 and the structure of the water inlet channels 5, the accumulation of eddies and inclusions is reduced.

[0028] The internal space of the threaded groove 6 is connected to the internal space of the nozzle through groove 5. The cross-section of the threaded groove 6 is set with a "V" shape structure, and the surface of the threaded groove 6 is made of silon-bonded phase. According to the structure of the threaded groove 6, the molten steel flowing into the nozzle through groove 5 generates axial rotation flow through the threaded groove 6, reducing the local turbulence intensity.

[0029] The outer side of the refractory brick body 1 is provided with a combined square groove 9, and a support frame 10 is installed inside the combined square groove 9. The combined square groove 9 is symmetrically distributed on the refractory brick body 1, and the connection between the combined square groove 9 and the support frame 10 is embedded and fixed. The outer surface of the frame of the support frame 10 is flush with the outer surface of the refractory brick body 1. Based on the support frame 10 installed in the combined square groove 9, the refractory brick body 1 can be reinforced as a whole by using a clamping tool through the support frame 10 to maintain the stability after installation.

[0030] Working principle: According to Figures 1 to 6First, the refractory brick body 1 can be embedded in the bottom seat brick of the steel drum. Simultaneously, auxiliary clamping tools can be used to clamp and compress the support frame 10 within the combined square groove 9, improving the stability of the refractory brick body 1 after installation. When subsequent steel molten metal is to be introduced, it can be poured into the inlet groove 2. Based on the flow guide center plate 3 at the center of the inlet groove 2 and the first rounded corner 4 at the junction of the inlet groove 2's wall and bottom surface, it facilitates the rapid guidance of molten steel into the inlet through groove 5. Furthermore, the second rounded corner 7 guides the molten steel smoothly into the nozzle groove, reducing turbulence and eddies, preventing impurities from accumulating at the nozzle corners, thereby improving... The molten steel entering the through-flow groove 5 can generate axial rotational flow through the threaded groove 6, reducing the intensity of local turbulence. It is then discharged through the opening at the bottom of the through-flow groove 5. Furthermore, a third rounded corner 8 is provided at the junction of the bottom end of the through-flow groove 5 and the bottom surface of the refractory brick body 1. Sharp corners are prone to becoming concentration points of thermal and mechanical stress, which can easily cause cracks under high-temperature cycling. The rounded corners smoothly transition and reduce the peak value of local stress, significantly improving the resistance to thermal shock cracking. The above is the working process of the entire device. All contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A reinforced silicon nitride nozzle refractory brick comprising a refractory brick body (1), characterized in that: The top surface center of the refractory brick body (1) is provided with a liquid inlet hole groove (2), and the center of the liquid inlet hole groove (2) is provided with a flow guide center disc (3), the hole wall of the liquid inlet hole groove (2) is provided with a first fillet (4) at the intersection with the bottom surface, the inside of the refractory brick body (1) is provided with a water gap through groove (5), and the curved surface of the water gap through groove (5) is provided with a threaded groove (6), the top end of the water gap through groove (5) is provided with a second fillet (7) at the intersection with the bottom surface of the liquid inlet hole groove (2), and the bottom end of the water gap through groove (5) is provided with a third fillet (8) at the intersection with the bottom surface of the refractory brick body (1).

2. The reinforced silicon nitride nozzle throat brick according to claim 1, wherein: The refractory brick body (1) and the flow guide center disc (3) are provided in an integrated structure, and the top surface diameter of the flow guide center disc (3) is smaller than the bottom surface diameter of the flow guide center disc (3), the planar spacing between the flow guide center disc (3) and the first fillet (4) is equal to the maximum diameter of the second fillet (7), and the refractory brick body (1) is made of base material silicon nitride.

3. The reinforced silicon nitride nozzle throat brick according to claim 1, wherein: The internal space of the liquid inlet hole groove (2) and the internal space of the water gap through groove (5) are interconnected, and the height of the liquid inlet hole groove (2) is greater than the height of the flow guide center disc (3).

4. The reinforced silicon nitride nozzle throat brick according to claim 1, wherein: The water gap through groove (5) is equally angularly distributed on the refractory brick body (1), and the diameter of the water gap through groove (5) decreases from top to bottom, and the surface of the water gap through groove (5) is provided with an oxidation resistant coating.

5. The reinforced silicon nitride nozzle throat brick according to claim 1, wherein: The internal space of the threaded groove (6) and the internal space of the water gap through groove (5) are interconnected, the cross section of the threaded groove (6) is provided in a "V" shape structure, and the surface of the threaded groove (6) is made of a combination phase of sylon.

6. The reinforced silicon nitride nozzle throat brick according to claim 1, wherein: The outside of the refractory brick body (1) is provided with a combined square groove (9), and the inside of the combined square groove (9) is provided with a supporting square frame (10), the combined square groove (9) is symmetrically distributed on the refractory brick body (1), the combined square groove (9) and the supporting square frame (10) are connected in an embedded fixed manner, and the edge frame outer surface of the supporting square frame (10) and the outer surface of the refractory brick body (1) are flush with each other.

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