阅读说明：本技术 一种可热态更换的池壁结构及其更换方法 (Pool wall structure capable of being replaced in hot state and replacement method thereof ) 是由 严育仓 方长应 翁晓东 赵仙良 于 2021-11-09 设计创作，主要内容包括：本申请提供一种可热态更换的池壁结构及其更换方法,所述池壁结构包括依次设置的接触层、背衬层、保温层和温度监测装置,所述背衬层的顶面低于所述接触层的顶面设置,所述保温层的顶面低于所述背衬层的顶面设置,所述温度检测装置的检测端位于所述接触层内；所述背衬层包括由上至下依次分布的上背衬和下背衬,所述上背衬的顶面高于所述保温层的顶面、且低于所述接触层的顶面设置,所述下背衬的顶面低于所述保温层的顶面设置。本方案的池壁结构可以在不停产的情况下进行热态更换,其接触层、背衬层和保温层的高度逐渐降低,使得该池壁结构的散热面积增大,提高了池壁散热效率,从而降低被侵蚀的速度。(The application provides a pool wall structure capable of being replaced in a thermal state and a replacement method thereof, wherein the pool wall structure comprises a contact layer, a back lining layer, a heat preservation layer and a temperature monitoring device which are sequentially arranged, the top surface of the back lining layer is lower than the top surface of the contact layer, the top surface of the heat preservation layer is lower than the top surface of the back lining layer, and the detection end of the temperature monitoring device is positioned in the contact layer; the back sheet includes the last back sheet and the lower back sheet that from top to bottom distribute in proper order, the top surface of going up the back sheet is higher than the top surface of heat preservation, and be less than the top surface setting of contact layer, the top surface of back sheet is less than down the top surface setting of heat preservation. The pool wall structure of this scheme can carry out the hot change under the condition of not stopping production, and the height of its contact layer, back sheet and heat preservation reduces gradually for the heat radiating area of this pool wall structure increases, has improved pool wall radiating efficiency, thereby reduces the speed of being eroded.)

1. The pool wall structure capable of being replaced in a hot state is characterized by comprising a contact layer (1), a backing layer (2), a heat insulation layer (3) and a temperature monitoring device (4) which are sequentially arranged, wherein the top surface of the backing layer (2) is lower than the top surface of the contact layer (1), the top surface of the heat insulation layer (3) is lower than the top surface of the backing layer (2), and the detection end of the temperature monitoring device (4) is positioned in the contact layer (1);

backing layer (2) are including last backing (21) and lower backing (23) that from top to bottom distributes in proper order, the top surface of going up backing (21) is higher than the top surface of heat preservation (3) and be less than the top surface setting of contact layer (1), the top surface of lower backing (23) is less than the top surface setting of heat preservation (3).

2. The pool wall structure of claim 1, wherein the backing layer (2) further comprises a middle backing (22) located between the upper backing (21) and the lower backing (23), the bottom surface of the middle backing (22) being disposed lower than the top surface of the insulating layer (3).

3. The pool wall structure of claim 2, further comprising a fastening structure (5), the fastening structure (5) being connected with the middle and upper backings (22, 21).

4. The tank wall structure according to claim 1, wherein said contact layer (1) comprises a roof brick (11) and a contact portion (12) located below said roof brick (11), the bottom surface of said roof brick (11) being disposed below or flush with the liquid level in the tank furnace;

the top surface of the upper backing (21) is arranged higher than the bottom surface of the top tile (11).

5. The pool wall structure according to claim 4, wherein the temperature monitoring device (4) comprises a first detection end (41) and a second detection end (42), the first detection end (41) being located in the ceiling tile (11) and the second detection end (42) being located in the contact portion (12).

6. The pool wall structure according to claim 5, wherein the first detection end (41) is located at a position of 1/2-2/3 in the thickness direction, at the middle of the height direction of the ceiling tile (11); the second detection end (42) is located at the middle of the height direction of the contact part (12) and at the position of 1/3-1/2 in the thickness direction.

7. The tank wall structure according to claim 1, characterized in that the tank wall structure further comprises cooling means (6), the output end of the cooling means (6) being located above the insulating layer (3) and towards the backing layer (2) at a level flush with the liquid level in the tank furnace.

8. The pool wall structure of claim 1, wherein the bottom surface of the insulation layer (3) is disposed below or flush with the bottom surface of the lower backing (23).

9. The pool wall structure of claim 1, wherein the upper backing (21) and the middle backing (22) are made of materials containing 30-65% of zirconium, and the lower backing (23) is made of materials containing more than 90% of chromium.

10. A method of replacing a pool wall structure according to any of claims 1-9, wherein the method of replacing comprises the steps of:

the liquid level is lowered to be lower than the bottom surface of the heat-insulating layer (3);

taking out the heat-insulating layer (3) and disassembling the temperature monitoring device (4);

-sequentially extracting the upper backing (21), the middle backing (22) and the lower backing (23);

taking out the roof bricks (11) of the contact layer (1), cleaning the installation positions of the roof bricks (11), and installing new roof bricks;

the lower backing (23), the middle backing (22), the upper backing (21) and the insulating layer (3) are installed in this order.

Technical Field

The application relates to the technical field of tank furnaces, in particular to a tank wall structure capable of being replaced in a thermal state and a replacement method thereof.

Background

Conventional glass tank furnaces use a breast wall with burners to melt the glass, typically with the wall bricks eroding primarily in the sub-surface portion. The tank wall structure is generally divided into a contact layer directly contacted with molten glass, a back lining layer and an insulating layer, wherein the contact layer and the back lining layer are of an integral structure, and the liquid level is located in the middle of the tank wall brick, namely, the tank wall bricks on the upper layer and the lower layer of the liquid level are integral.

Along with the washing of high-temperature glass liquid and the high-temperature oxygen-enriched combustion of the burner arranged on the crown top, the part (above the liquid level) of the pool wall brick exposed in the space has serious erosion, and even more, after the erosion for a period of time, the part (above the liquid level) of the pool wall brick exposed in the space can evaporate and disappear, thereby seriously affecting the normal operation and operation of the kiln.

Because of the change of the combustion mode of the kiln at present, the part eroded by the pool wall brick is transferred from the part below the liquid level to the part above the liquid level (exposed in the space part), and the erosion of the part below the liquid level can be repaired by adopting the conventional operation (a method for tiling the outer part of the eroded pool wall brick); however, the erosion of the part above the liquid level can only be temporarily relieved by using the tiles, the liquid level is positioned at the middle position of the three-phase interface and the brick material of the tank wall and is the most seriously eroded part of the tank wall, the tank wall tiles at the liquid level are of an integral structure, the replacement difficulty is high, the thermal state replacement is difficult, if a conventional method for performing the tile-bonding on the outer part of the liquid level of the tank wall tiles is adopted, the thickness of the tiles is strictly limited, and the method can only temporarily relieve the erosion problem of the exposed space part of the tank wall, and cannot completely solve the problem.

Disclosure of Invention

The following is a summary of the subject matter described in detail in this application. This summary is not intended to limit the scope of the claims.

The application provides a pool wall structure capable of being replaced in a thermal state in production and a replacement method thereof.

According to a first aspect of the application, a pool wall structure capable of being replaced in a hot state is provided, the pool wall structure comprises a contact layer, a back lining layer, a heat preservation layer and a temperature monitoring device which are sequentially arranged, wherein the top surface of the back lining layer is lower than the top surface of the contact layer, the top surface of the heat preservation layer is lower than the top surface of the back lining layer, and the detection end of the temperature monitoring device is positioned in the contact layer;

the back sheet includes the last back sheet and the lower back sheet that from top to bottom distribute in proper order, the top surface of going up the back sheet is higher than the top surface of heat preservation, and be less than the top surface setting of contact layer, the top surface of back sheet is less than down the top surface setting of heat preservation.

Wherein the backing layer further comprises a middle backing positioned between the upper backing and the lower backing, the bottom surface of the middle backing being positioned lower than the top surface of the insulating layer.

Wherein the pool wall structure further comprises a fastening structure connected with the mid-backing and the upper-backing.

The contact layer comprises a top brick and a contact part positioned below the top brick, and the bottom surface of the top brick is lower than or flush with the liquid level in the tank furnace; the top surface of the upper backing is arranged higher than the bottom surface of the top brick.

Wherein, the height of the top brick is 50-100 mm.

The temperature monitoring device comprises a first detection end and a second detection end, the first detection end is located in the top brick, and the second detection end is located in the contact part.

Wherein the first detection end is positioned in the middle of the top brick in the height direction and at the position of 1/2-2/3 in the thickness direction; the second detection end is located at the middle part of the height direction of the contact part and at the position of 1/3-1/2 in the thickness direction.

The pool wall structure further comprises a cooling device, and the output end of the cooling device is located above the heat insulation layer and faces the liquid level position of the back lining layer, wherein the liquid level position is flush with the liquid level position in the pool kiln.

Wherein the bottom surface of the insulating layer is lower than or flush with the bottom surface of the lower backing.

Wherein the difference in height between the top surface of the insulating layer and the top surface of the upper backing is greater than 100 mm.

The material of the upper backing and the material of the middle backing contain 30-65% of zirconium, and the material of the lower backing contains more than 90% of chromium.

According to a second aspect of the present application, there is provided a method of replacing a pool wall structure as described above, the method comprising the steps of:

reducing the liquid level to be lower than the bottom surface of the heat-insulating layer;

taking out the heat-insulating layer and disassembling the temperature monitoring device;

sequentially removing the upper backing, the middle backing, and the lower backing;

taking out the roof bricks of the contact layer, cleaning the installation positions of the roof bricks, and installing new roof bricks;

and sequentially installing the lower backing, the middle backing, the upper backing and the heat-insulating layer.

The pool wall structure provided by the application can be replaced in a thermal state under the condition of no production stop, and the heights of the contact layer, the back lining layer and the heat insulation layer are gradually reduced, so that the heat dissipation area of the pool wall structure is increased, the heat dissipation efficiency of the pool wall is improved, and the erosion speed is reduced; the back lining layer is of a split structure comprising the upper back lining, the middle back lining and the lower back lining, so that the back lining layer is convenient to disassemble and assemble, the replacement efficiency can be improved, the continuous and smooth production is ensured, and the service life of the kiln is effectively prolonged.

Other aspects will be apparent upon reading and understanding the attached drawings and detailed description.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the embodiments of the application. In the drawings, like reference numerals are used to indicate like elements. The drawings in the following description are directed to some, but not all embodiments of the application. For a person skilled in the art, other figures can be derived from these figures without inventive effort.

FIG. 1 is a schematic structural view of a thermally replaceable pool wall structure according to an exemplary embodiment;

FIG. 2 is a schematic structural view of a thermally replaceable pool wall structure according to an exemplary embodiment;

fig. 3 is a schematic diagram illustrating a structure of a replaced pool wall structure according to an exemplary embodiment.

Reference numerals:

1. a contact layer; 11. carrying out top brick; 12. a contact portion; 2. a backing layer; 21. an upper backing; 22. a middle backing; 23. a lower backing; 3. a heat-insulating layer; 4. a temperature monitoring device; 5. a fastening structure; 6. and a cooling device.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the disclosed embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The exemplary embodiment of this application provides a pool wall structure that can change by heat-attitude, including contact layer, back sheet and the heat preservation that sets gradually, the height of contact layer, back sheet and heat preservation reduces gradually and makes this pool wall structure be the echelonment setting to increase heat radiating area, improve pool wall radiating efficiency, thereby reduce the speed of being eroded. Wherein, the back sheet sets up to go up the split type structure that back sheet, well back sheet and back sheet constitute down to in the dismouting, reduce artifical intensity of labour, improve and change efficiency, can also select different materials according to the high position difference of last back sheet and back sheet down simultaneously, with the performance of guaranteeing the back sheet, further improve the erosion resistance of pool wall structure. The pool wall structure of this scheme only needs to fall the liquid level in the kiln to the height below the heat preservation, then demolish heat preservation and back sheet in proper order after, can demolish, change the crown brick of contact layer, realizes the hot change of pool wall structure, need not the shut down, guarantees production efficiency, the life of extension kiln.

The hot-replaceable pool wall structure and the replacement method thereof provided by the present application will be described in detail below with reference to the accompanying drawings.

Fig. 1 shows a structural schematic diagram of a specific embodiment of the pool wall structure that can be replaced in a hot state of this application, and as shown in fig. 1, this pool wall structure includes contact layer 1, backing layer 2 and heat preservation layer 3 that set gradually to the three is the echelonment and distributes, and the top surface of backing layer 2 is less than the top surface setting of contact layer 1, and the top surface of heat preservation layer 3 is less than the top surface setting of backing layer 2. The stepped structure arrangement is beneficial to increasing the heat dissipation area of the pool wall structure and improving the heat dissipation efficiency, thereby delaying the eroded speed of the pool wall.

The pool wall structure further comprises a temperature monitoring device 4, and the detection end of the temperature monitoring device 4 is positioned in the contact layer 1 and used for detecting the temperature of the contact layer 1 in real time. And judging whether the pool wall structure is corroded and whether the pool wall structure needs to be replaced or not according to the detected temperature condition of the contact layer 1.

For example, the detection end of the temperature monitoring device 4 may be provided with a thermocouple, that is, a thermocouple is provided at a preset position in the contact layer 1 to detect a temperature change condition of the contact layer 1, so as to determine an infringement condition of the arrangement position of the thermocouple.

In order to facilitate the disassembly and assembly, in the scheme, the backing layer 2 comprises an upper backing layer 21 and a lower backing layer 23 which are sequentially distributed from top to bottom, wherein the top surface of the upper backing layer 21 is higher than the top surface of the heat preservation layer 3 and lower than the top surface of the contact layer 1, and the top surface of the lower backing layer 23 is lower than the top surface of the heat preservation layer 3.

To further facilitate disassembly, the backing layer 2 further comprises a middle backing 22 positioned between the upper backing 21 and the lower backing 23, the bottom surface of the middle backing 22 being positioned below the top surface of the insulating layer 3.

Fig. 2 is a schematic structural view of a pool wall structure according to an exemplary embodiment, and as shown in fig. 2, the pool wall structure of the present solution further comprises a fastening structure 5 for supporting the stability of the backing layer 2. In the embodiment shown in fig. 1, the lower backing 23 is located between the insulating layer 3 and the contact layer 1, and the fastening structure 5 is connected with the middle backing 22 and the upper backing 21, while ensuring structural stability and mounting firmness of the middle backing 22 and the upper backing 21.

Since the first portion of the contact layer 1 to be eroded is a portion higher than the liquid level in practical use, the contact layer 1 is provided in a split structure in this embodiment. Illustratively, the contact layer 1 comprises a top brick 11 and a contact part 12 positioned below the top brick 11, and the bottom surface of the top brick 11 is arranged below or flush with the liquid level in the tank furnace. Therefore, during maintenance, only the top brick 11 needs to be replaced. In the time of actual operation, only need fall the liquid level in the tank furnace to be less than heat preservation 3, then take out heat preservation 3 and back sheet 2 in proper order, then demolish, change crown brick 11, again install back sheet 2 and heat preservation 3 in proper order can, convenient operation, simple can realize the online thermal state maintenance of pool wall structure, improve change efficiency, reduce artifical intensity of labour.

In an alternative embodiment, the top surface of the upper backing 21 is disposed higher than the bottom surface of the tile 11 and lower than the top surface of the tile 11, and the bottom surface of the upper backing 21 is lower than the bottom surface of the tile 11, i.e., the upper backing 21 covers and protects the bottom installation seam of the tile 11. Illustratively, the height center of the upper backing 21 is flush with the bottom surface of the ceiling tile 11, i.e. the height center of the upper backing 21 is flush with the liquid level in the tank furnace, so as to ensure that the tank wall is uniformly stressed.

In an alternative embodiment, the height of the top brick 11 is 50-100 mm to avoid overflow of molten glass in the tank furnace, which would result in waste of refractory materials if the height of the top brick 11 is too high. For example, the difference in height between the top surface of the ceiling tile 11 and the liquid surface may be 60mm, 72mm, 86mm, or 95 mm.

In the tank furnace, the erosion rates below and above the liquid level of the tank wall structure are different, and the erosion rate at a portion higher than the liquid level is higher than the erosion rate below the liquid level. Referring back to fig. 1, in order to accurately detect the erosion of the contact layer 1, the temperature monitoring device 4 includes a first detection end 41 and a second detection end 42 for detecting the temperature condition and the erosion condition of the contact layer 1 above the liquid level and below the liquid level, respectively. The first detection end 41 is positioned in the top brick 11 to detect the temperature condition of the top brick 11 higher than the liquid level in real time so as to judge the eroded condition; the second detection end 42 is located in the contact portion 12 below the liquid level to detect the temperature change of the contact portion 12 in real time. The temperatures of the ceiling tile 11 and the contact part 12 are detected in real time through the first detection end 41 and the second detection end 42, respectively, so that the corroded conditions of the ceiling tile 11 and the contact part 12 are accurately judged.

When the detection value of the first detection end 41 exceeds a preset threshold value or the detection amplitude of the first detection end 41, the temperature monitoring device 4 gives an alarm to prompt a worker that the position of the first detection end 41 is corroded to prepare for replacing the roof brick 11. Accordingly, when the detection value of the second detection end 42 exceeds the preset threshold value or the detection amplitude of the second detection end 42, the temperature monitoring device 4 gives an alarm to prompt the worker that the position of the second detection end 42 is corroded to prepare for replacing the contact part 12.

In actual use, since the erosion rate of the ceiling tile 11 is higher than that of the contact portion 12, the positions of the first detection end 41 and the second detection end 42 in the thickness direction of the contact layer 1 are different. For example, the detection position of the first detection tip 41 is closer to the surface of the contact layer 1 that contacts the liquid surface than the detection position of the second detection tip 42. When the first detection end 41 detects and judges that the corrosion is caused, the temperature monitoring device 4 gives an alarm to prompt a worker to observe the position and the adjacent position, and prepare for replacing the pool wall structure, at this time, the roof brick 11 can be replaced, and the contact part 12 below the roof brick 11 can be waited to be replaced together; when the second detection end 42 detects and judges that the roof brick 11 and the contact portion 12 are corroded, the temperature monitoring device 4 gives an alarm to prompt a worker to replace the roof brick 11 and the contact portion 12 at the positions.

In some embodiments, the first detection end 41 is located at the middle of the top tile 11 in the height direction and at the position 1/2-2/3 in the thickness direction, so as to detect and identify the eroded condition of the top tile 11 as soon as possible while ensuring the stable structure of the top tile 11. The second detection end 42 is located at the middle part of the contact part 12 in the height direction and at the position 1/3-1/2 in the thickness direction, so that the corrosion of the contact part 12 can be detected on the premise that the structural stability of the contact part 12 and the contact layer 1 is ensured, and the roof brick 11 is not corroded to be used continuously, and a worker can be prompted to find out the replacement of the roof brick 11 and/or the contact part 12 in time.

The pool wall structure that this application provided still includes cooling device 6, and cooling device 6's output is located 3 tops of heat preservation, sets up in the liquid level position in the tank furnace towards the parallel and level of back sheet 2. In practical application, the position of the liquid surface line is most seriously corroded, and the corrosion of the corresponding position of the liquid surface line can be delayed by the cooling device 6. For example, the cooling device 6 may be an air-cooled structure, i.e., the cooling device 6 outputs air with a preset pressure to the backing layer 2 at a preset speed to reduce the temperature of the position where the backing layer 2 is flush with the liquid surface, and thus corrosion is delayed.

In the embodiment shown in fig. 1, the output end of the cooling device 6 is disposed toward the upper backing layer 21 to deliver flowing air to the upper backing layer 21 and the middle backing layer 22 to reduce the surface temperature of the upper backing layer 21 and the middle backing layer 22 and to retard erosion.

In this embodiment, the bottom surface of the insulating layer 3 is disposed below or flush with the bottom surface of the lower backing 23 to facilitate complete removal of the backing layer 2 after removal of the insulating layer 3.

It should be pointed out that, in this scheme, back sheet 2 sets up to split type structure, still is convenient for choose for use different materials according to the position of each structure to promote the various performances of back sheet 2. Illustratively, the zirconium content in the material of the upper backing 21 and the middle backing 22 is 30-65%, which can effectively prevent the contact layer 1 from conducting electricity to the fastening structure 5 at high temperature, and ensure the safety of the cell wall structure. For another example, the material of the lower backing 23 may be a refractory material with a chromium content of more than 90% which is the same as the material of the contact layer 1, so as to improve the erosion resistance of the backing layer 2 and the pool wall structure.

In an alternative embodiment, the difference in height between the top surface of the insulating layer 3 and the top surface of the upper backing 21 is greater than 100 mm. The zirconium content of the materials of the upper backing 21 and the middle backing 22 is 30-65%, the erosion resistance is far lower than that of the refractory material of the lower backing 23 with the chromium content more than 90%, and the height difference is used for increasing the cooling area of the cooling device 6, reducing the surface temperature of the upper backing 21 and the middle backing 22, slowing down the erosion speed of the upper backing 21 and the middle backing 22 (the defects of the materials) and protecting the safe operation of the pool wall.

In an alternative embodiment, the height of the bottom surface of the middle backing 22 lower than the top surface of the heat-insulating layer 3 is 50-100 mm. The lower back lining 23 is made of refractory material with good erosion resistance and easy electric conduction and chromium content more than 90%, the heat-insulating layer 3 is made of refractory material with difficult electric conduction, and the bottom surface of the middle back lining 22 is lower than the top surface of the heat-insulating layer 3 so as to prevent electric conduction to the fastening structure 5 at high temperature and further enable the whole glass kiln to become an electric conductor.

Fig. 3 shows a schematic structural diagram of a replaced pool wall structure, and referring to fig. 1 and fig. 3 together, in this scheme, the water drum 24 can be used to replace the upper backing 21 and the middle backing 22, and when the roof brick 11 and the contact part 12 are supported and fixed, the roof brick 11 and the contact part 12 are cooled by water, so as to prolong the service life of the roof brick 11 and the contact part 12, i.e. the service life of the contact layer 1.

In accordance with the above-described wall structure, the present application also provides a method of replacing a wall structure as described above. In an alternative embodiment, the replacement method comprises the steps of:

the liquid level is lowered to be lower than the bottom surface of the heat-insulating layer 3; for example, the liquid level of the glass is lowered to be 100 mm-200 mm lower than the bottom surface of the heat-insulating layer 3;

the fastening structure 5 is disassembled, then the heat preservation layer 3 is taken out, and the temperature monitoring device 4 is disassembled;

then taking out the upper backing 21, the middle backing 22 and the lower backing 23 in sequence;

then taking out the top brick 11 of the contact layer 1, cleaning the installation position of the top brick 11, and installing a new top brick;

then, the lower back lining 23, the middle back lining 22, the upper back lining 21 and the heat preservation layer 3 are sequentially arranged, and then the fastening structure 5 is arranged to fix the back lining layer 2.

In one exemplary embodiment, the upper backing 21 and the middle backing 22 may not be installed, and a water pocket may be used instead, as shown in fig. 3. The water bag 24 is used for replacing the upper backing 21 and the middle backing 22 to position the top brick 11 and the contact part 12, and simultaneously, the top brick 11 and the contact part 12 can be cooled by water, so that the service life of the top brick 11 and the contact part 12 is prolonged.

In the glass tank furnace formed by the tank wall structure, the temperature of the contact layer 1 is detected in real time by the temperature monitoring device 4 in the use process, and the corroded condition of the contact layer 1 is judged according to the temperature; when the part of the contact layer 1 higher than the molten glass is corroded, the contact layer can be directly replaced in a hot state without stopping production. In the change in-process, fall the liquid level to being less than heat preservation 3, the purpose is after dismantling heat preservation 3 and back sheet 2, guarantees the stability of contact layer 1, is convenient for change the roof brick 11 that is eroded.

The embodiments or implementation modes in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

In the description herein, references to the terms "embodiment," "exemplary embodiment," "some embodiments," "illustrative embodiments," "example" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application.

In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application.

It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various structures, but these structures are not limited by these terms. These terms are only used to distinguish one structure from another.

Like elements in one or more of the drawings are referred to by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale. In addition, certain well known components may not be shown. For the sake of simplicity, the structure obtained after several steps can be described in one figure. Numerous specific details of the present application, such as structure, materials, dimensions, processing techniques and techniques of the devices are described below in order to provide a more thorough understanding of the present application. However, as will be understood by those skilled in the art, the present application may be practiced without these specific details.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.