Combined air brick structure

Abstract

The utility model provides a combined air brick structure which comprises a shell with a conical structure, an upper brick body arranged at the upper part in the shell and a lower brick body arranged at the lower part in the shell, and further comprises a buffer layer arranged at a position between the upper brick body and the lower brick body and arranged to coordinate the thermal expansion difference between the upper brick body and the lower brick body, the upper brick body or the lower brick body is prevented from cracking; the reinforcer is arranged at the inner position of the integral structure formed by the upper brick body, the buffer layer and the lower brick body and is used for enhancing the bonding strength between adjacent interfaces; the air brick is reasonable in design structure, the thermal expansion difference of the upper brick body and the lower brick body is coordinated by arranging the buffer layer, the problem of brick body cracking caused by overhigh thermal stress under the high-temperature working condition is avoided, and the bonding strength of adjacent interfaces can be remarkably enhanced by utilizing the reinforcers, so that the overall structure of the air brick is more stable under the high-temperature working condition, and the service life of the air brick is prolonged. And the service life of the air brick is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of breathable brick technology, specifically relating to a combined breathable brick structure. Background Technology

[0002] Permeable bricks are key functional refractory materials used in the metallurgical industry for high-temperature containers such as steel ladles and molten iron ladles. Their main function is to achieve uniform stirring and impurity removal of molten steel by blowing inert gas (such as argon) into the molten steel. Their performance directly affects the steel refining effect and smelting efficiency.

[0003] Currently, common permeable bricks are mainly divided into two types: dispersed and slotted. Dispersed permeable bricks have a uniformly distributed microporous structure inside, through which gas is released evenly, achieving a gentle and uniform mixing effect. However, they suffer from problems such as low gas flow rate and easy clogging of micropores. Slotted permeable bricks have directionally arranged slotted channels inside, which can provide a larger gas flow rate and stronger mixing force. However, they are prone to molten steel splashing, and the slotted structure is susceptible to erosion by molten steel and thermal stress damage at high temperatures.

[0004] In existing technologies, composite permeable bricks have adopted a layered structure design with upper dispersion and lower slits. By combining the uniform gas distribution of the dispersion layer with the high-flow-rate gas supply of the slit layer, the gas mixing effect is improved to a certain extent. However, this structure still has significant drawbacks in practical applications: due to the fundamental differences in material composition and microstructure between the dispersion-type brick and the slit-type brick, their coefficients of thermal expansion do not match, resulting in significant thermal stress under high-temperature conditions, leading to brick cracking. At the same time, in traditional processes, the two types of bricks are mainly bonded through simple sintering, resulting in insufficient interfacial bonding strength. This makes them prone to interlayer cracking and delamination under long-term thermal cycling, seriously affecting the service life and reliability of the permeable brick. Utility Model Content

[0005] This utility model provides a combined breathable brick structure to solve the problems mentioned in the background art, such as the large thermal stress during operation caused by the difference in the thermal expansion coefficient of the bricks, which leads to brick cracking, and the insufficient bonding strength between the two types of bricks.

[0006] The technical solution adopted by this utility model is: a combined breathable brick structure, including a conical outer shell, an upper brick body disposed at the top and a lower brick body disposed at the bottom inside the outer shell, and further including:

[0007] A buffer layer is placed between the upper and lower bricks to coordinate the difference in thermal expansion between the upper and lower bricks, so as to prevent cracking of the upper or lower bricks.

[0008] The reinforcing element is located inside the integral structure formed by the upper brick body, the buffer layer, and the lower brick body, and is designed to enhance the bonding strength between adjacent interfaces.

[0009] The upper brick body is a diffuse brick body with a porous structure and a porosity of 20%-30%.

[0010] The buffer layer is an Al2O3-ZrO2 composite layer with a thickness of 10-20 mm.

[0011] The lower brick and the buffer layer have multiple slits that penetrate their upper and lower ends, and these slits are evenly distributed around the center of the lower brick.

[0012] The reinforcing member is an anchor installed inside the upper brick body, the buffer layer, and the lower brick body. The anchor penetrates the upper and lower surfaces of the buffer layer and extends into the upper and lower brick bodies.

[0013] The anchors are numerous and evenly distributed around the center of the lower brick.

[0014] The reinforcing member is a stainless steel fiber mesh that passes through the upper and lower ends of the buffer layer and extends into the interior of the upper and lower bricks.

[0015] Also includes:

[0016] The first ventilation cavity is recessed and located at the center of the bottom surface of the lower brick, and is connected to the slit.

[0017] The second venting cavity is recessed and positioned in the middle of the surface of the buffer layer.

[0018] The bottom surface of the upper brick body has an inwardly recessed arc-shaped cavity at the position corresponding to the second ventilated cavity.

[0019] It also includes a vent pipe installed at the bottom of the housing, which is connected to the first vent chamber.

[0020] The beneficial effects of this utility model are as follows:

[0021] This utility model has a reasonable design structure. By setting a buffer layer, it coordinates the difference in thermal expansion between the upper and lower bricks, avoiding the problem of brick cracking caused by excessive thermal stress under high temperature conditions. Furthermore, the use of reinforcing members can significantly enhance the bonding strength of adjacent interfaces, making the overall structure of the breathable brick more stable under high temperature conditions, which is conducive to extending the service life of the breathable brick. Attached Figure Description

[0022] Figure 1 This is a structural diagram of Embodiment 1 of the present utility model;

[0023] Figure 2 This is a structural diagram of Embodiment 2 of the present invention.

[0024] in:

[0025] 1. Vent pipe; 2. First vent chamber; 3. Outer shell; 4. Slit; 5. Lower brick body; 6. Buffer layer; 7. Second vent chamber; 8. Anchor; 9. Upper brick body; 10. Stainless steel fiber mesh; 11. Cavity. Detailed Implementation

[0026] 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.

[0027] Example 1

[0028] like Figure 1 As shown, a composite permeable brick structure includes a conical outer shell 3, with an upper brick body 9 disposed at the top and a lower brick body 5 disposed at the bottom inside the outer shell 3, and further includes:

[0029] The buffer layer 6 is located between the upper brick 9 and the lower brick 5 and is designed to coordinate the thermal expansion difference between the upper brick 9 and the lower brick 5 in order to prevent cracking of the upper brick 9 or the lower brick 5.

[0030] The reinforcing member is located inside the integral structure formed by the upper brick body 9, the buffer layer 6, and the lower brick body 5, and is designed to enhance the bonding strength between adjacent interfaces.

[0031] The upper brick body 9 is a dispersion type brick body with a porous structure and a porosity of 20%-30%. Specifically, this dispersion type brick body can be made of corundum-mullite dispersion, and its pore size can be set at 10-50μm. It has the characteristics of uniform microporous structure, good air permeability, and resistance to molten steel penetration. This microporous structure can release gas evenly to reduce molten steel splashing.

[0032] More specifically, the lower brick body 5 can be made of magnesium aluminum spinel, which has the characteristic of high strength at high temperatures.

[0033] The buffer layer 6 is an Al2O3-ZrO2 composite layer with a thickness of 10-20 mm. The coefficient of thermal expansion of the buffer layer 6 is between that of the lower brick 5 and the upper brick 9. In other embodiments, the buffer layer 6, the upper brick 9, and the lower brick 5 are also coated with Al2O3 sol to promote interfacial bonding. The contact surface between the buffer layer 6 and the upper brick 9 and the lower brick 5 can be designed with a wavy structure to further improve the interfacial bonding effect.

[0034] The lower brick body 5 and the buffer layer 6 have multiple slits 4 that penetrate their upper and lower ends. The multiple slits 4 are evenly distributed around the center of the lower brick body 5 to allow gas to pass through the slits 4 from bottom to top. There are 6-8 slits 4, and their width is 0.15-0.25mm.

[0035] The reinforcing member is an anchor 8 installed inside the upper brick body 9, the buffer layer 6, and the lower brick body 5. The anchor 8 penetrates the upper and lower surfaces of the buffer layer 6 and extends into the upper brick body 9 and the lower brick body 5, respectively. There are multiple anchors 8, which are evenly distributed around the center of the lower brick body 5. The anchor 8 can further improve the bonding strength between adjacent interfaces and effectively suppress the shear stress between adjacent layers, providing more stable connection performance and making the overall structure of the breathable brick more robust.

[0036] Specifically, this permeable brick structure also includes:

[0037] The first ventilation cavity 2 is recessed and located at the center of the bottom surface of the lower brick 5, and is connected to the slit 4.

[0038] The second ventilated cavity 7 is recessed and positioned in the middle of the surface of the buffer layer 6.

[0039] It also includes a vent pipe installed at the bottom of the outer casing 3, which is connected to the first vent chamber 2.

[0040] In practical operation, the vent pipe 1 is connected to an inert gas pipeline. The inert gas enters the first vent chamber 2 through the vent pipe, then enters the second vent chamber 7 through the slit 4, and is discharged upwards after passing through the micropores of the upper brick 9, thus playing a role in stirring the molten steel and removing impurities. This combined vent brick structure not only solves the problems of molten steel splashing caused by traditional slit 4-type vent bricks, low gas flow rate of dispersion-type vent bricks, and easy clogging of micropores, but also coordinates the thermal expansion difference between the upper and lower bricks 5 by setting a buffer layer 6, avoiding the problem of brick cracking caused by excessive thermal stress under high-temperature conditions. Furthermore, the use of reinforcing members can significantly enhance the bonding strength of adjacent interfaces, making the overall structure of the vent brick more stable under high-temperature conditions, which is conducive to extending the service life of the vent brick.

[0041] Example 2

[0042] like Figure 2As shown, the only difference between this embodiment and the first embodiment described above is that the reinforcing member is a stainless steel fiber mesh 10, which passes through the upper and lower ends of the buffer layer 6 and extends into the interior of the upper brick 9 and the lower brick 5. In this example, the stainless steel fiber mesh 10 is designed as a cylindrical structure. The stainless steel fiber mesh 10 can be used to reinforce the structure of the upper brick 9, the buffer layer 6, and the lower brick 5. In addition, in other embodiments, the stainless steel fiber mesh 10 can also be designed as a non-cylindrical structure, or there can be multiple stainless steel fiber meshes 10. This is not limited here.

[0043] Furthermore, in this embodiment, the bottom surface of the upper brick 9, corresponding to the position of the second ventilated cavity 7, has an inwardly recessed arc-shaped cavity 11, such as... Figure 2 As shown, the design of the concave cavity 11 can increase the contact area between the gas and the upper brick 9, enabling the gas to diffuse more quickly from the micropores of the upper brick 9 and improving the air permeability.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A combined air brick structure comprising a conical structure shell, an upper brick body arranged above and a lower brick body arranged below inside the shell, characterized in that, Also included are: a buffer layer disposed between the upper brick body and the lower brick body to coordinate the difference in thermal expansion between the upper brick body and the lower brick body to avoid cracking of the upper brick body or the lower brick body; a reinforcing member disposed inside the overall structure formed by the upper brick body, the buffer layer, and the lower brick body to enhance the bonding strength between adjacent interfaces.

2. A combined gas-permeable brick structure according to claim 1, characterized in that The upper brick body is a dispersed brick body with a porous structure inside, and the porosity is 20-30%.

3. A combined gas-permeable brick structure according to claim 1, characterized in that The buffer layer is an Al2O3-ZrO2 composite layer with a thickness of 10-20 mm.

4. The combination gas check structure of claim 1, wherein, The lower brick body and the buffer layer have a plurality of slits passing through the upper and lower end surfaces thereof, and the plurality of slits are uniformly distributed around the center of the lower brick body.

5. A combined gas-permeable brick structure according to any one of claims 1-3, characterized in that The reinforcing member is an anchor member installed inside the upper brick body, the buffer layer, and the lower brick body, and the anchor member passes through the upper and lower surfaces of the buffer layer and extends into the interior of the upper brick body and the lower brick body.

6. A combined gas-permeable brick structure according to claim 5, characterized in that The number of anchor members is multiple and uniformly distributed around the center of the lower brick body.

7. A combined gas-permeable brick structure according to any one of claims 1-3, characterized in that The reinforcing member is a stainless steel fiber mesh that passes through the upper and lower ends of the buffer layer and extends into the interior of the upper brick body and the lower brick body.

8. A combined gas-permeable brick structure according to any one of claims 1-3, characterized in that Also included are: a first air permeable cavity recessed in the center of the bottom surface of the lower brick body and connected to the slits; a second air permeable cavity recessed in the middle of the surface of the buffer layer.

9. A combined gas permeable brick structure according to claim 8, characterized in that The bottom surface of the upper brick body has an arc-shaped recessed cavity recessed at a position corresponding to the second air permeable cavity.

10. A combined gas-permeable brick structure according to any one of claims 1-3, characterized in that Also included is an air pipe installed at the bottom of the shell, and the air pipe is connected to the first air permeable cavity.

Images