A uniquely shaped crucible bottom

Abstract

This application relates to the field of crucible structure technology and discloses an irregularly shaped crucible bottom, including a bottom body composed of a conical sidewall and a discharge pipe. The discharge pipe is fixed below the conical sidewall. The inner wall of the conical sidewall is provided with an anti-stick coating, and the outer wall of the discharge pipe is provided with reinforcing ribs that extend axially along the discharge pipe and are evenly distributed circumferentially. In this application, a funnel-shaped feeding channel is formed by the conical sidewall, combined with the inner wall ceramic-based anti-stick coating and its surface nanoscale uneven structure with a height difference of 5-20 micrometers. This dual effect of structural guidance and surface performance effectively solves the material residue problem of traditional flat-bottomed or simple arc-shaped bottoms. Especially for high-viscosity molten materials, it can significantly reduce residual dead corners, improve discharge smoothness, and reduce material waste and cleaning difficulty.

Description

Technical Field

[0001] This utility model relates to the field of crucible structure technology, and in particular to an irregularly shaped crucible bottom. Background Technology

[0002] Crucibles, as high-temperature containers commonly used in laboratories and industrial production, are widely used in fields such as metal smelting, materials synthesis, and chemical analysis.

[0003] Traditional crucibles typically employ flat or simple curved bottoms, which have gradually revealed numerous technical defects during use. First, after heating and reacting, materials often adhere to the inner wall of the crucible bottom due to their stickiness, leading to incomplete discharge, material waste, and difficulty in cleaning. This is especially true for high-viscosity molten materials, where the traditional flat-bottom structure easily creates dead corners. Second, as the core load-bearing and heat transfer area of ​​the crucible, the bottom deforms or cracks under high-temperature conditions due to concentrated thermal stress. The stress concentration problem caused by structural abrupt changes is particularly prominent at the connection between the bottom and the discharge pipe, severely affecting the crucible's service life. Utility Model Content

[0004] To solve the above problems, this utility model provides an irregularly shaped crucible bottom.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: An irregularly shaped crucible bottom includes a bottom body, which is composed of a conical sidewall and a discharge pipe. The discharge pipe is fixed below the conical sidewall. The inner wall of the conical sidewall is provided with an anti-stick coating. The outer wall of the discharge pipe is provided with reinforcing ribs, which extend along the axial direction of the discharge pipe and are evenly distributed circumferentially.

[0006] By adopting the above technical solution, the combined structure of the conical sidewall and the discharge pipe forms a funnel-shaped feeding channel. The inner wall anti-stick coating can reduce material residue and improve the smoothness of discharge. The reinforcing ribs on the outer wall of the discharge pipe can enhance its structural strength and prevent deformation caused by material gravity or external force under high temperature environment. At the same time, the circumferentially evenly distributed design can make the force more balanced.

[0007] Furthermore, an arc-shaped transition section is provided at the connection between the conical sidewall and the discharge pipe, and the inner wall of the arc-shaped transition section is provided with a wear-resistant layer, and the wear-resistant layer is made of silicon carbide.

[0008] By adopting the above technical solution, the arc-shaped transition section can disperse the stress concentration at the connection between the conical sidewall and the discharge pipe, reducing the risk of cracking under high temperature conditions; the wear-resistant layer of silicon carbide material can improve the wear resistance and high temperature resistance of this key part, extend the service life of the pot bottom, and is especially suitable for scenarios containing particulate materials.

[0009] Furthermore, the thickness of the conical sidewall gradually increases from the top to the bottom.

[0010] By adopting the above technical solution, the overall stress on the bottom of the pot can be made more reasonable. The thickened part at the bottom can enhance the structural strength of the area connected to the discharge pipe, while the relatively thin design at the top can reduce heat conduction resistance, improve heating efficiency, and achieve a balance between strength and heat transfer performance.

[0011] Furthermore, the anti-stick coating is a ceramic-based anti-stick coating, and the surface of the anti-stick coating is provided with a nanoscale uneven structure, the height difference of which is 5-20 micrometers.

[0012] By adopting the above technical solution, the ceramic-based anti-stick coating has excellent high temperature resistance and anti-stick properties, making it suitable for high-temperature reaction scenarios; the nanoscale uneven structure on the surface can reduce the contact area between the material and the coating, further reducing adhesion, while enhancing the wear resistance of the coating surface and avoiding the decline in anti-stick performance due to long-term use.

[0013] Furthermore, the cross-section of the reinforcing rib is semi-circular, and the height of the reinforcing rib is 4 mm.

[0014] By adopting the above technical solution, the reinforcing ribs of the semi-circular cross section can reduce stress concentration points while ensuring structural strength, facilitate cleaning and avoid scratching other parts during handling or installation, and at the same time facilitate heat dissipation and reduce the risk of local overheating of the discharge pipe.

[0015] Furthermore, a sealing cap is provided at the end of the discharge pipe, and the sealing cap is connected to the discharge pipe by a thread. A high-temperature resistant sealing gasket is provided on the inner wall of the sealing cap, and the sealing gasket is made of flexible graphite.

[0016] By adopting the above technical solution, the threaded sealing cap can reliably seal the discharge pipe, preventing material leakage when not in use or during the reaction process; the flexible graphite high-temperature resistant sealing gasket has good high-temperature resistance and sealing performance, can adapt to the high-temperature operating environment of the crucible, and avoids wear caused by rigid contact between the sealing cap and the discharge pipe.

[0017] In summary, this utility model has the following beneficial effects: 1. In this application, a funnel-shaped feeding channel is formed by a conical sidewall, combined with a ceramic-based anti-stick coating on the inner wall and a nano-scale concave-convex structure with a height difference of 5-20 micrometers on its surface. It effectively solves the problem of material residue in traditional flat-bottomed or simple arc-shaped pots from both structural guidance and surface performance aspects. Especially for high-viscosity molten materials, it can significantly reduce dead corners, improve the smoothness of discharge, and reduce material waste and cleaning difficulty. 2. In this application, the abrupt structural change at the connection between the conical sidewall and the discharge pipe is eliminated by the arc-shaped transition section design. Combined with the gradual thickening structure of the conical sidewall from top to bottom, the thermal stress concentration that is prone to occur in traditional pot bottoms is effectively dispersed, reducing the risk of deformation and cracking under high temperature conditions. At the same time, the silicon carbide wear-resistant layer on the inner wall of the arc-shaped transition section further enhances the wear resistance and high temperature resistance of this key part, significantly extending the service life of the pot bottom. 3. In this application, the semi-circular reinforcing ribs evenly distributed around the outer wall of the discharge pipe reduce stress concentration points while ensuring structural strength and avoiding high-temperature deformation; the tapered sidewall thickness gradient design achieves a precise balance between strength and heat transfer performance - the thickened bottom ensures the strength of the connection area, and the thinner top design reduces heat conduction resistance, solving the problem that traditional pot bottoms cannot balance strength and heat transfer efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the conical sidewall and its connection structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the sealing cap and its connection structure according to an embodiment of the present invention.

[0019] In the diagram: 1. Bottom body; 2. Conical sidewall; 3. Discharge pipe; 4. Anti-stick coating; 5. Reinforcing rib; 6. Sealing cap; 7. High-temperature resistant sealing gasket; 8. Wear-resistant layer. Detailed Implementation

[0020] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0021] like Figure 1-3 As shown in the figure, this application discloses an irregularly shaped crucible bottom, including a bottom body 1. The bottom body 1 is composed of a conical sidewall 2 and a discharge pipe 3. The discharge pipe 3 is fixed below the conical sidewall 2. The inner wall of the conical sidewall 2 is provided with an anti-stick coating 4. The outer wall of the discharge pipe 3 is provided with reinforcing ribs 5, and the reinforcing ribs 5 extend along the axial direction of the discharge pipe 3 and are evenly distributed circumferentially.

[0022] The pot bottom body 1 consists of a conical sidewall 2 and a discharge pipe 3, which are fixedly connected by an integral molding process. The lower end of the conical sidewall 2 and the upper end of the discharge pipe 3 form a continuous structure without obvious splicing seams. This integral molding design avoids stress concentration points that may be generated by separate connections (such as welding), ensuring structural stability under high temperature environments. The conical sidewall 2, as the core component for material bearing and flow guidance, uses its funnel-shaped structure to guide the material to gather towards the discharge pipe 3 by gravity, solving the problem of "residual dead corners" in traditional flat-bottomed pots. The discharge pipe 3, as the material output channel, is coaxial with the conical sidewall 2 to ensure a stable material flow path. The integral molding of the two components not only ensures the overall structural strength but also improves the smoothness of material discharge through the continuous channel design, forming a synergistic effect with subsequent structures such as the anti-stick coating 4 and reinforcing ribs 5.

[0023] Anti-stick coating 4: The anti-stick coating 4 is attached to the inner wall surface of the conical sidewall 2 by high-temperature sintering process. The ceramic matrix material itself has the characteristics of high temperature resistance and low surface energy, which directly reduces the adhesion of materials (especially molten metal and high viscosity slurry).

[0024] Reinforcing Rib 5: Reinforcing Rib 5 is connected to the outer wall of the discharge pipe 3 by welding or integral casting. Each reinforcing rib 5 extends along the axial direction of the discharge pipe 3, and its root is completely attached to the outer wall of the discharge pipe 3. Argon arc welding is used during welding. The semi-circular cross-section design improves the bending strength of the discharge pipe 3 while reducing stress concentration points and avoiding cracks caused by thermal expansion and contraction at high temperatures.

[0025] An arc-shaped transition section is provided at the connection between the conical sidewall 2 and the discharge pipe 3, and a wear-resistant layer 8 is provided on the inner wall of the arc-shaped transition section, and the material of the wear-resistant layer 8 is silicon carbide.

[0026] Arc-shaped transition section: The arc-shaped transition section is an integrated structure at the connection between the conical sidewall 2 and the discharge pipe 3, forming a continuous curved surface transition with the conical sidewalls 2 and the discharge pipe 3 on both sides. The wear-resistant layer 8 is attached to the inner wall of the arc-shaped transition section using a thermal spraying process. The arc-shaped transition section changes the "right-angle connection" between the conical sidewall 2 and the discharge pipe 3 into a "smooth transition" through its curved surface design, reducing the impact force of materials flowing through this section by 30%-40%, while dispersing the thermal stress in this area and solving the problem of easy cracking in traditional right-angle connections. The silicon carbide wear-resistant layer 8 can resist the erosion and wear of particulate materials. Combined with the structural strength of the transition section, it significantly extends the service life of the pot bottom.

[0027] The thickness of the conical sidewall 2 gradually increases from the top to the bottom.

[0028] Conical sidewall 2: The thickness of the conical sidewall 2 gradually changes linearly from top to bottom. This is achieved through the cavity design of the casting mold. The gradual thickness design achieves a balance between "efficient heat transfer at the top" and "high-strength support at the bottom".

[0029] The anti-stick coating 4 is a ceramic-based anti-stick coating 4. The surface of the anti-stick coating 4 is provided with a nano-level concave-convex structure with a height difference of 5-20 micrometers.

[0030] The cross-section of the reinforcing rib 5 is semi-circular, and the height of the reinforcing rib 5 is 4 mm.

[0031] The end of the discharge pipe 3 is provided with a sealing cap 6, and the sealing cap 6 is connected to the discharge pipe 3 by threads. The inner wall of the sealing cap 6 is provided with a high-temperature resistant sealing gasket 7, and the material of the sealing gasket is flexible graphite.

[0032] Sealing cap 6: The outer wall of the end of the discharge pipe 3 is machined with fine threads, and the inner wall of the sealing cap 6 is machined with matching internal threads. The two are connected by threads to achieve detachable fixation. The sealing gasket is made of flexible graphite material and is embedded in the annular groove on the inner wall of the sealing cap 6. When the sealing cap 6 is tightened, the sealing gasket is compressed to form a radial seal. The detachable design of the threaded connection facilitates the cleaning and maintenance of the discharge pipe 3. The tight fit of the fine threads can initially prevent material leakage. The flexible graphite sealing gasket has high temperature resistance, chemical corrosion resistance and good elasticity. Under the action of tightening force, it undergoes plastic deformation to fill the micro gap between the sealing cap 6 and the discharge pipe 3, achieving reliable sealing at high temperatures.

[0033] The operating principle of the irregularly shaped crucible bottom in this embodiment is as follows: The conical sidewall 2 is funnel-shaped, allowing materials to naturally gather at the bottom using gravity. Its inclined angle design ensures that the materials slide along the inner wall under their own weight, avoiding the problem of "residue in low-lying areas" in traditional flat-bottom structures. The integral molding design of the conical sidewall 2 and the discharge pipe 3 forms a continuous channel. After being guided by the conical sidewall 2, the materials directly enter the discharge pipe 3, reducing flow resistance and achieving "dead-angle-free" discharge. The ceramic-based anti-stick coating 4 itself has low surface energy characteristics, which can reduce the intermolecular interaction between the high-temperature molten materials and the inner wall. The force fundamentally reduces the probability of adhesion. The nanoscale uneven structure with a height difference of 5-20 micrometers on the surface further reduces the actual contact area between the material and the coating through the "air isolation effect," making it easier for the material to detach from the inner wall under the action of gravity. At the same time, the nanostructure enhances the wear resistance of the coating, resists the erosion of materials during long-term use, and maintains the anti-stick performance. The arc-shaped transition at the connection between the conical sidewall 2 and the discharge pipe 3 changes the traditional "right-angle turn" to a "smooth curved surface," which disperses the impact force when the material flows through this point, while avoiding the concentration of thermal stress at the corner, reducing the risk of cracking at high temperatures. The silicon carbide wear-resistant layer 8 on the inner wall of the transition section can withstand the high-speed scouring of granular materials, reducing the wear rate and extending the service life of critical parts. The thinner conical sidewall 2 at the top reduces heat conduction resistance, making it easier for heat from the external heat source to be transferred to the internal material, improving heating efficiency and ensuring uniform heating of the material. The thickened structure at the bottom enhances the strength of the connection area with the discharge pipe 3, allowing it to withstand greater material weight and thermal stress, avoiding deformation caused by structural weakness at high temperatures, and achieving the dual requirements of "efficient heat transfer" and "high-strength support". The semi-circular semi-circular grooves evenly distributed on the outer wall of the discharge pipe 3... The reinforcing rib 5 increases the moment of inertia of the cross section, improving the bending strength of the discharge pipe 3 and resisting the deformation caused by the weight of the material and the external clamping force. The threaded connection between the sealing cap 6 and the discharge pipe 3 provides a basic fixation. The tight fit of the fine thread can initially prevent material leakage. The flexible graphite gasket undergoes plastic deformation under the tightening force, filling the micro gap between the sealing cap 6 and the discharge pipe 3. Its high temperature resistance can adapt to the high temperature environment of the crucible, while isolating metal contact and preventing the sealing cap 6 and the discharge pipe 3 from sticking or wearing due to high temperature, ensuring reliable sealing during the reaction process or when idle.

[0034] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An irregularly shaped crucible bottom, comprising a bottom body (1), characterized in that: The pot bottom body (1) is composed of a conical sidewall (2) and a discharge pipe (3). The discharge pipe (3) is fixed below the conical sidewall (2). The inner wall of the conical sidewall (2) is provided with an anti-stick coating (4). The outer wall of the discharge pipe (3) is provided with reinforcing ribs (5), and the reinforcing ribs (5) extend along the axial direction of the discharge pipe (3) and are evenly distributed in the circumference.

2. The irregularly shaped crucible bottom according to claim 1, characterized in that: An arc-shaped transition section is provided at the connection between the conical sidewall (2) and the discharge pipe (3), and the inner wall of the arc-shaped transition section is provided with a wear-resistant layer (8), and the material of the wear-resistant layer (8) is silicon carbide.

3. The irregularly shaped crucible bottom according to claim 2, characterized in that: The thickness of the conical sidewall (2) gradually increases from top to bottom.

4. The irregularly shaped crucible bottom according to claim 3, characterized in that: The anti-stick coating (4) is a ceramic-based anti-stick coating (4), and the surface of the anti-stick coating (4) is provided with a nanoscale uneven structure, the height difference of the uneven structure is 5-20 micrometers.

5. The irregularly shaped crucible bottom according to claim 4, characterized in that: The cross-section of the reinforcing rib (5) is semi-circular, and the height of the reinforcing rib (5) is 4 mm.

6. The irregularly shaped crucible bottom according to claim 5, characterized in that: The end of the discharge pipe (3) is provided with a sealing cap (6), and the sealing cap (6) is connected to the discharge pipe (3) by a thread. The inner wall of the sealing cap (6) is provided with a high temperature resistant sealing gasket (7), and the material of the sealing gasket is flexible graphite.

Images