阅读说明：本技术 玻璃液搅拌装置及玻璃液质量改进方法 (Molten glass stirring device and molten glass quality improvement method ) 是由 陈筱丽 郭富强 周思宇 易平 刘小宁 于 2019-12-18 设计创作，主要内容包括：本发明提供一种可以在1550℃以上长期稳定运行的搅拌装置,并解决玻璃液均化问题。玻璃液搅拌装置,包括搅拌器和搅拌室,搅拌室是由侧壁、底壁和顶壁构成的空心体结构,在搅拌室上设置有顶孔、玻璃液出口和玻璃液入口,搅拌器包括中心轴、左横杆、右横杆、左竖杆和右竖杆,中心轴分别与左横杆和右横杆连接,左横杆与左竖杆连接,右横杆与右竖杆连接。本发明通过搅拌器左横杆、右横杆、左竖杆、右竖杆以及底横杆的作用,玻璃液内部分子扩散、溶解及搅拌器混合效果得到显著改善,玻璃液的均匀性得到提升；搅拌器内层冷却系统使搅拌器整体温度得到控制,降低了搅拌器材料在高温下失效的风险,对保持搅拌器形状,延长搅拌器使用寿命具有显著改进。(The invention provides a stirring device which can stably operate for a long time at the temperature of more than 1550 ℃, and solves the problem of homogenization of molten glass. Glass liquid agitating unit, including agitator and teeter chamber, the teeter chamber is the hollow body structure that comprises lateral wall, diapire and roof, is provided with apical pore, glass liquid export and glass liquid entry on the teeter chamber, and the agitator includes center pin, left horizontal pole, right horizontal pole, left montant and right montant, and the center pin is connected with left horizontal pole and right horizontal pole respectively, and left horizontal pole is connected with left montant, and right horizontal pole is connected with right montant. According to the invention, through the action of the left cross rod, the right cross rod, the left vertical rod, the right vertical rod and the bottom cross rod of the stirrer, the diffusion and dissolution effects of the molecules in the glass liquid and the mixing effect of the stirrer are obviously improved, and the uniformity of the glass liquid is improved; the stirrer inner layer cooling system controls the whole temperature of the stirrer, reduces the failure risk of stirrer materials at high temperature, and has obvious improvement on the shape maintenance and the service life extension of the stirrer.)

1. Glass liquid agitating unit, including agitator (1) and teeter chamber (2), its characterized in that, teeter chamber (2) are the hollow body structure that comprises lateral wall (21), diapire (22) and roof (23) be provided with apical pore (24), glass liquid export (25) and glass liquid entry (27) on teeter chamber (2), agitator (1) is including center pin (11), left horizontal pole (12), right horizontal pole (13), left montant (14) and right montant (15), center pin (11) are connected with left horizontal pole (12) and right horizontal pole (13) respectively, left horizontal pole (12) are connected with left montant (14), right horizontal pole (13) are connected with right montant (15).

2. The molten glass stirring device according to claim 1, wherein the stirrer (1) is further provided with a bottom cross bar (16), and the right vertical bar (15) and the left vertical bar (15) are respectively connected with the bottom cross bar (16).

3. The molten glass stirring device according to claim 1 or 2, wherein the central shaft (11), the left cross bar (12), the right cross bar (13), the left vertical bar (14), the right vertical bar (15) and the bottom cross bar (16) are all composed of an outer layer (17), an intermediate layer (18) and an inner layer (19), and the inner layers (19) on the central shaft (11), the left cross bar (12), the right cross bar (13), the left vertical bar (14), the right vertical bar (15) and the bottom cross bar (16) are communicated.

4. The molten glass stirring device according to claim 3, wherein the outer layer (17) is made of a noble metal material, and the thickness of the outer layer (17) is 0.5mm to 1.8mm, and preferably 0.8mm to 1.0 mm.

5. A molten glass stirring apparatus according to claim 3, wherein the outer layer (17) is made of platinum metal; or is made of platinum-rhodium alloy or platinum-rhodium dispersion material, wherein the weight percentage content of rhodium is 5% -15%, and the optimal content is 8% -12%; or a platinum gold alloy, wherein the weight percentage content of the gold is 2-12%, and the optimal content is 5-8%.

6. A molten glass stirring apparatus according to claim 3, wherein the intermediate layer (18) is made of a refractory material, preferably a refractory material having an upper temperature limit of more than 1600 ℃ and a density of less than 2000kg/m at ambient temperature³。

7. A molten glass stirring apparatus according to claim 3, wherein the inner layer (19) is composed of a cooling pipe and a cooling medium.

8. The molten glass stirring device according to claim 3, wherein the inner layer (19) is a sleeve structure of a large sleeve and a small sleeve which are concentric or eccentric round pipes; or a separate multiple tube structure.

9. A molten glass stirring apparatus according to claim 3, wherein a fulcrum (20) is provided at regular intervals outside the inner layer (19).

10. The molten glass stirring device according to claim 1 or 2, wherein the outer surfaces of the left cross bar (12), the right cross bar (13), the left vertical bar (14), the right vertical bar (15) and the bottom cross bar (16) are uniformly provided with a plurality of small prisms, cylinders or cones.

11. Glass stirring device according to claim 1 or 2, wherein the maximum length L of the left vertical bar (14) and the right vertical bar (15) is 0.3-0.8, preferably 0.4-0.7 of the height of the glass-liquid line (3) in the stirring chamber (2).

12. A molten glass stirring apparatus according to claim 1 or 2, wherein the left cross bar (12) and the right cross bar (13) are connected to the left vertical bar (14) and the right vertical bar (15), respectively, at their highest points; or the left cross bar (12) and the right cross bar (13) are respectively connected with the left vertical bar (14) and the right vertical bar (15) at the lowest points; or the left cross bar (12) and the right cross bar (13) are respectively connected with the middle points of the left vertical bar (14) and the right vertical bar (15) in the length direction.

13. The molten glass stirring device according to claim 1 or 2, wherein the minimum distance w between the outer surfaces of the left and right vertical rods (14, 15) and the side wall (21) of the stirring chamber (2) is 0.11 to 0.25 of the diameter of the inscribed circle formed by the side wall (21) of the stirring chamber (2).

14. A molten glass stirring device according to claim 1 or 2, wherein the minimum distance m between the bottom surface of the left vertical rod (14) and the bottom surface of the right vertical rod (15) and the bottom wall (22) of the stirring chamber (2) is within 100 mm; or the minimum distance between the outer layer surface of the bottom cross bar (16) and the bottom wall (22) of the stirring chamber (2) is within 100 mm.

15. The glass-stirring device as claimed in claim 1 or 2, characterized in that the outer layer (17) of the left cross bar (12), the right cross bar (13) and the bottom cross bar (16) of the stirrer (1) is provided with an expansion zone consisting of a plurality of expansion rings, the maximum distance between the wave crest and the wave trough of which does not exceed 12mm, preferably 5-10 mm.

16. A method for modifying the quality of molten glass, the method comprising the steps of:

1) the inner layer (19) of the stirrer (1) is filled with a cooling medium, and the temperature difference between the inlet and the outlet of the cooling medium is controlled to meet the requirement;

2) when the continuous melting is adopted to produce the ultra-high temperature glass, the glass liquid is input into the stirring chamber (2) through the glass liquid inlet (27) and reaches the stable liquid level line of the process design; when the discontinuous melting production is adopted, powder of glass components, a mixture of the powder and glass slag or glass liquid is input into the stirring chamber (2) through a glass liquid inlet (27), when the glass liquid in the stirring chamber (2) has stirring conditions, the stirrer (1) is placed into the glass liquid, and at the moment, the glass liquid level reaches a stable liquid level line of process design; controlling the temperature of the glass liquid in the stirring and homogenizing process to enable the glass liquid to be in a viscosity range capable of homogenizing and eliminating stripes;

3) the stirrer (1) rotates clockwise or anticlockwise at a constant speed according to design requirements, and by means of speed difference between the stirrer (1) and the glass liquid, the glass liquid in the stirring chamber (2) is forced to generate horizontal rotation motion and vertical convection in a local vertical direction, so that inhomogeneity in the glass liquid is elongated, thinned and cut, the contact area of homogeneous and heterogeneous glass liquid in the glass liquid is increased, and the homogeneous main body glass liquid and the heterogeneous glass liquid are mutually dissolved, diffused and mixed;

4) the glass liquid is influenced by stirring circulation in the stirring chamber (2), the retention time is greatly increased, so that the influence of heterogeneous glass liquid is gradually reduced, when the uniformity of the glass liquid meets the technical requirement of a product, the glass liquid is homogenized in the stirring chamber (2), and the glass liquid is discharged from a glass liquid outlet (25) to enter the next production procedure.

17. The method for improving the quality of molten glass according to claim 16, wherein the step 3) is: the stirrer (1) rotates clockwise or anticlockwise at a constant speed according to design requirements, so that the glass metal in the stirring chamber (2) generates forced convection, the glass metal in the stirring chamber (2) moves along with the stirrer (1) and is divided into three conditions, the first condition is that the glass metal near the outer layer surface of the stirrer generates rotary motion, and the region with the maximum speed generates a glass metal adhesive layer on the outer layer surface of the stirrer; the second is that the glass liquid in the area covered by the left cross bar (12), the right cross bar (13) and the bottom cross bar (16) partially presents the movement of up-down convection near the central line; the third is that the glass liquid outside the coverage area of the left vertical rod (14) and the right vertical rod (15) generates fluid section change when moving relative to the side wall of the stirring chamber through the left vertical rod (14) and the right vertical rod (15) to form the effect of extruding fluid, so that the glass liquid is in regular up-and-down convection motion; through the three movement modes, the internal mixing and diffusion effects of the molten glass in the stirring chamber (2) are obviously improved.

18. The method of claim 16, wherein the rotational speed in step 3) is between 0.5 and 30 revolutions per minute, preferably between 0.5 and 15 revolutions per minute.

19. The molten glass quality improvement method according to claim 16, characterized in that when the left cross bar (12) and the right cross bar (13) are respectively connected with the left vertical bar (14) and the right vertical bar (15) at the highest points, the distance d from the outer layer surfaces of the left cross bar (12) and the right cross bar (13) to the glass liquid surface is 0.1-0.6L, preferably 0.3-0.6L; when the left cross bar (12) and the right cross bar (13) are respectively connected with the left vertical bar (14) and the right vertical bar (15) at the lowest points; or when the left cross bar (12) and the right cross bar (13) are respectively connected with the midpoint positions of the left vertical bar (14) and the right vertical bar (15) in the length direction, the distance d from the highest point of the left vertical bar (14) and the right vertical bar (15) to the glass liquid level is 0.1-0.8L, and the optimal distance d is 0.3-0.6L.

Technical Field

The invention relates to a stirring device for homogenizing molten glass in an ultrahigh-temperature glass production process, and a method for homogenizing non-uniform components in the molten glass by using the stirring device so as to improve the quality of the molten glass.

Background

The ultra-high temperature glass production generally means that the highest temperature of one or more of three processes of melting, clarifying and homogenizing of molten glass reaches or exceeds 1550 ℃ in the production process due to special composition. In the production of the ultra-high temperature glass, the process temperature reaches more than 1550 ℃, so that the ultra-high temperature glass has high requirements on the temperature resistance of production equipment, and meanwhile, the ultra-high temperature glass is usually applied to special industries, such as aerospace, weaponry, high-precision equipment and the like, so that the ultra-high temperature glass has strict requirements on the product quality.

The production process of the ultra-high temperature glass is similar to the production process flow of the common glass, and generally comprises the processes of melting, clarifying, homogenizing, forming, annealing, packaging and the like of molten glass in a melting furnace. The homogenization process in the process mainly eliminates the non-uniform components in the glass liquid, improves the optical performance of the glass product and plays an extremely important role in production.

In a general glass production process, the homogenization process usually adopts stirrers with different shapes to increase the homogeneity of the molten glass in a mechanical stirring manner. For the glass liquid with the viscosity changing along with the temperature, the non-uniform parts in the glass melt are stretched into thin stripes by mechanical stirring, the stretched stripes are cut into a plurality of short segments by a stirrer blade perpendicular to the main flow direction, the short stripe segments are dispersed in the glass liquid main body by the action of a stirring rotating area, and the contact surface between the homogeneous glass liquid and the non-homogeneous glass liquid in the glass liquid is greatly increased by the action, so that the mutual dissolution, diffusion and mixing of the components between the homogeneous glass liquid and the non-homogeneous glass liquid are facilitated, and the required uniformity index requirement is met when the glass liquid is formed into a glass product after the homogenization process. The influence factors of the homogenization effect of the molten glass are mainly determined by the homogenization efficiency of the stirrer and the stirring chamber, the difference between the quality of the molten glass and the quality of the heterogeneous molten glass, and the like. The improvement of the homogenizing efficiency of the stirrer and the stirring chamber is generally realized by designing the stirrer into a paddle type, a frame type, a disc type and the like and a distance between the stirrer and the wall surface of the stirring chamber. The difference in properties between homogeneous and heterogeneous glass melts mainly arises from differences in glass melt composition caused by previous processes, the influence of temperature gradients caused by flow, and the like.

In the homogenization process of the ultra-high temperature glass, the size of a stirring chamber is usually larger than that of common optical glass, display plate glass and the like, and the operation temperature is also higher, so that the mechanical strength of the stirrer adopting common structural design and materials is sharply reduced due to high-temperature creep of the materials, and the service life of the stirrer is also greatly reduced; meanwhile, the mechanical strength is reduced, the original design shape is difficult to maintain, and the stirring efficiency is greatly reduced. On the other hand, the use temperature of the stirrer is greatly increased in the homogenization process, and the control of impurity defects in the mechanical stirring process is also required to be noticed, so that the secondary pollution to the molten glass is prevented, and the product quality is prevented from being influenced.

Disclosure of Invention

The invention aims to provide a stirring device which can stably operate for a long time at the temperature of more than 1550 ℃, solve the problem of homogenization of molten glass in the production process of ultra-high temperature glass and improve the quality of the molten glass.

The invention also provides a quality improvement method of the molten glass.

The technical scheme adopted by the invention for solving the technical problem is as follows: glass liquid agitating unit, including agitator and teeter chamber, the teeter chamber is the hollow body structure that comprises lateral wall, diapire and roof be provided with apical pore, glass liquid export and glass liquid entry on the teeter chamber, the agitator includes center pin, left horizontal pole, right horizontal pole, left montant and right montant, the center pin is connected with left horizontal pole and right horizontal pole respectively, left horizontal pole is connected with left montant, right horizontal pole is connected with right montant.

Further, the stirrer is further provided with a bottom cross rod, and the right vertical rod and the left vertical rod are respectively connected with the bottom cross rod.

Further, center pin, left horizontal pole, right horizontal pole, left montant, right montant and end horizontal pole constitute by skin, intermediate level and inlayer, just the inlayer on center pin, left horizontal pole, right horizontal pole, left montant, right montant and the end horizontal pole is the intercommunication.

Further, the outer layer is made of a noble metal material, the thickness of the outer layer is 0.5mm-1.8mm, and the optimal thickness is 0.8mm-1.0 mm.

Further, the outer layer is made of platinum metal; or is made of platinum-rhodium alloy or platinum-rhodium dispersion material, wherein the weight percentage content of rhodium is 5% -15%, and the optimal content is 8% -12%; or a platinum gold alloy, wherein the weight percentage content of the gold is 2-12%, and the optimal content is 5-8%.

Furthermore, the intermediate layer is made of refractory materials, preferably refractory materials with the upper temperature limit higher than 1600 ℃ can be used, and the density of the refractory materials at normal temperature is less than 2000kg/m³。

Further, the inner layer is composed of a cooling pipe and a cooling medium.

Furthermore, the inner layer adopts a sleeve structure designed by a large sleeve and a small concentric or eccentric circular pipe; or a separate multiple tube structure.

Furthermore, a pivot is arranged outside the inner layer at intervals.

Furthermore, a plurality of small prisms, cylinders or cones are uniformly arranged on the outer layer surfaces of the left cross bar, the right cross bar, the left vertical bar, the right vertical bar and the bottom cross bar.

Further, the maximum length L of the left vertical rod and the right vertical rod is 0.3-0.8, preferably 0.4-0.7 of the height of the liquid level line of the glass liquid in the stirring chamber.

Further, the left cross rod and the right cross rod are respectively connected with the left vertical rod and the right vertical rod at the highest points; or the left cross bar and the right cross bar are respectively connected with the left vertical bar and the right vertical bar at the lowest points; or the left cross rod and the right cross rod are respectively connected with the middle points of the left vertical rod and the right vertical rod in the length direction.

Furthermore, the minimum distance w between the outer layer surfaces of the left vertical rod and the right vertical rod and the side wall of the stirring chamber is 0.11-0.25 of the diameter of an inscribed circle formed by the side wall of the stirring chamber.

Further, the minimum distance m between the bottom surfaces of the left vertical rod and the right vertical rod and the bottom wall 22 of the stirring chamber is within 100 mm; or the minimum distance between the outer layer surface of the bottom cross bar and the bottom wall of the stirring chamber is within 100 mm.

Furthermore, expansion areas consisting of a plurality of expansion rings are arranged on the outer layers of the left cross bar, the right cross bar and the bottom cross bar of the stirrer, and the maximum distance between the wave crest and the wave trough of each expansion ring is not more than 12mm, preferably 5-10 mm.

A method for modifying the quality of a molten glass, the method comprising the steps of:

1) cooling medium is introduced into the inner layer of the stirrer, and the temperature difference between the inlet and the outlet of the cooling medium is controlled to meet the requirement;

2) when the continuous melting is adopted to produce the ultra-high temperature glass, the glass liquid is input into the stirring chamber from the glass liquid inlet and reaches the stable liquid level line of the process design; when the discontinuous melting production is adopted, powder of glass components, a mixture of the powder and glass slag or glass liquid is input into a stirring chamber through a glass liquid inlet, when the glass liquid in the stirring chamber has stirring conditions, a stirrer is placed into the glass liquid, and the glass liquid level reaches a stable liquid level line of process design; controlling the temperature of the glass liquid in the stirring and homogenizing process to enable the glass liquid to be in a viscosity range capable of homogenizing and eliminating stripes;

3) the stirrer rotates clockwise or anticlockwise at a constant speed according to design requirements, and by means of speed difference between the stirrer and the glass liquid, the glass liquid in the stirring chamber is forced to generate horizontal rotation motion and vertical convection in a local vertical direction, so that inhomogeneity in the glass liquid is elongated, thinned and cut, the contact area between homogeneous glass liquid and heterogeneous glass liquid in the glass liquid is increased, and the homogeneous main body glass liquid and the heterogeneous glass liquid are mutually dissolved, diffused and mixed;

4) the glass liquid is influenced by stirring circulation in the stirring chamber, the retention time is greatly increased, so that the influence of heterogeneous glass liquid is gradually reduced, when the uniformity of the glass liquid reaches the technical requirement of a product, the glass liquid is homogenized in the stirring chamber and discharged from a glass liquid outlet to enter the next production procedure.

Further, the step 3) is as follows: the stirrer rotates clockwise or anticlockwise at a constant speed according to design requirements, so that the glass metal in the stirring chamber generates forced convection, the glass metal in the stirring chamber moves along with the stirrer and is divided into three conditions, the first condition is that the glass metal near the outer layer surface of the stirrer generates rotary motion, and the region with the maximum speed generates a glass metal adhesive layer on the outer layer surface of the stirrer; the second is that the partial glass liquid in the covered area of the left cross bar, the right cross bar and the bottom cross bar shows the movement of up-down convection; the third is that the glass liquid outside the coverage area of the left vertical rod and the right vertical rod generates fluid section change when the left vertical rod and the right vertical rod move relative to the side wall of the stirring chamber, so as to form an effect of extruding fluid and enable the glass liquid to present regular up-and-down convection motion; through the three movement modes, the internal mixing and diffusion effects of the molten glass in the stirring chamber are obviously improved;

further, the rotation speed in step 3) is between 0.5 and 30 revolutions per minute, preferably between 0.5 and 15 revolutions per minute.

Further, when the left cross bar and the right cross bar are respectively connected with the left vertical bar and the right vertical bar at the highest points, the distance d between the outer layer surfaces of the left cross bar and the right cross bar and the liquid level of the glass is 0.1-0.6L, and the preferable distance d is 0.3-0.6L; when the left cross rod and the right cross rod are respectively connected with the left vertical rod and the right vertical rod at the lowest points; or when the left cross bar and the right cross bar are respectively connected with the middle points of the left vertical bar and the right vertical bar in the length direction, the distance d from the highest point of the left vertical bar and the right vertical bar to the glass liquid level is 0.1-0.8L, and the preferable distance d is 0.3-0.6L.

The invention has the beneficial effects that: the convection efficiency of the glass liquid in the stirring chamber is effectively improved in a mechanical stirring mode; through the action of the left cross rod, the right cross rod, the left vertical rod, the right vertical rod and the bottom cross rod of the stirrer, the diffusion and dissolution effects of molecules in the glass liquid and the mixing effect of the stirrer are obviously improved, and the uniformity of the glass liquid is improved; the inner cooling system of the stirrer controls the whole temperature of the stirrer, reduces the failure risk of stirrer materials at high temperature, and further has obvious improvement on the shape maintenance and the service life prolonging of the stirrer; the surface temperature of the stirrer is controlled, and the quantity of noble metal particles falling off from the surface of the stirrer and entering the molten glass can also be reduced; the optimized design of the cover plate of the stirrer further reduces the possibility that volatile matters at the top of the stirring chamber are condensed and fall into the molten glass to form defects, so that the problem of impurity defects caused by the stirring process is favorably reduced.

Drawings

FIG. 1 is a schematic view of the structure of a stirring apparatus of the present invention.

FIG. 2 is a schematic view of the construction of a blender with a bottom rail for the blending apparatus of the present invention.

FIG. 3 is a partial cross-sectional view of the inner layer of the agitator of the mixing apparatus of the present invention.

FIG. 4 is a partial cross-sectional view of an alternative construction of the inner layer of the agitator of the mixing apparatus of the present invention.

Detailed Description

In the process of the ultrahigh-temperature glass homogenizing process, the problem of nonuniformity caused by factors such as the internal composition and the temperature of molten glass can be mechanically stirred by the stirring device provided by the invention, and finally, the purpose of eliminating nonuniformity in the glass is achieved. As shown in fig. 1, the stirring apparatus of the present invention comprises a stirrer 1 and a stirring chamber 2.

After the glass liquid reaches a certain liquid level height in the stirring chamber 2, the stirrer 1 is partially immersed in the glass liquid, then the stirrer 1 rotates anticlockwise or clockwise to drive the glass liquid in the stirring chamber 2 to rotate along with the stirrer 1, and the glass liquid in the stirring chamber 2 is forced to generate horizontal rotation motion and vertical convection in a local vertical direction by virtue of the speed difference between the stirrer 1 and the glass liquid, so that inhomogeneity in the glass liquid is elongated, thinned and cut, the contact area of the homogeneity and the inhomogeneous glass liquid in the glass liquid is increased, the homogeneity main body of the glass liquid and the inhomogeneous glass liquid are mutually dissolved, diffused and mixed, and finally the homogeneity of the glass liquid flowing out of the stirring chamber 2 meets the detection requirements of products on the aspects of refractive index, transmittance, expansion coefficient and the like.

The mixing chamber 2 is a hollow body structure formed by a side wall 21, a bottom wall 22 and a top wall 23, and the mixing chamber 2 is preferably cylindrical or polygonal in shape so as to match the circular motion of the mixer 1. A top hole 24, a molten glass outlet 25, a drain 26, and a molten glass inlet 27 are further provided in the stirring chamber 2, wherein the top hole 24 may be provided in the top wall 23, the molten glass outlet 25 and the drain 26 may be provided in the bottom wall 22, and the molten glass inlet 27 may be provided in the side wall 21, as shown in fig. 1. When the continuous discharging production is adopted, molten glass in the previous process is input through the molten glass inlet 27, and when the batch production is adopted, powder of glass components, a mixture of the powder and glass slag or molten glass can be input into the stirring chamber 2 through the molten glass inlet 27; the hollow body in the stirring chamber 2 provides space for homogenizing the molten glass; the top hole 24 is used for the stirrer 1 to extend into the stirring chamber 2 and is connected with an external driving mechanism; the molten glass outlet 25 is used for outputting the uniformly stirred molten glass to the next production flow; the discharge port 26 serves as a discharge passage for molten glass in the stirring chamber 2 in the case of abnormal production, while the discharge port 26 is in a closed state in the case of normal production, and the discharge port 26 is generally disposed at the lowest position in the stirring chamber 2.

The mixer 1 comprises a central shaft 11, a left cross bar 12, a right cross bar 13, a left vertical bar 14 and a right vertical bar 15, as shown in fig. 1, and the mixer 1 may further be provided with a bottom cross bar 16, as shown in fig. 2. The central shaft 11 is respectively connected with a left cross rod 12 and a right cross rod 13, the left cross rod 12 is connected with a left vertical rod 14, the right cross rod 13 is connected with a right vertical rod 15, and the right vertical rod 15 and the left vertical rod 15 are respectively connected with a bottom cross rod 16; the central shaft 11, the left cross bar 12, the right cross bar 13, the left vertical bar 14, the right vertical bar 15 and the bottom cross bar 16 are all composed of an outer layer 17, a middle layer 18 and an inner layer 19, and the inner layers 19 on the central shaft 11, the left cross bar 12, the right cross bar 13, the left vertical bar 14, the right vertical bar 15 and the bottom cross bar 16 are communicated, as shown in fig. 1 and 2.

In the working process of the stirrer 1, the central shaft 11 is driven to rotate by an external driving belt, the central shaft 11 drives the left cross rod 12, the right cross rod 13, the left vertical rod 14, the right vertical rod 15 and the bottom cross rod 16 to rotate, the molten glass is in contact with the outer layer 17 of the stirrer 1, and the molten glass near the outer wall surface of the stirrer also rotates along with the stirrer 1 due to the fluid near-wall effect. The inventor discovers through experimental analysis that the rotation speed of the stirrer 1 taking the central line of the central shaft 11 as the center is far greater than the natural convection speed inside the glass liquid and the flowing speed of the fed and discharged materials, so that the glass liquid presents the glass liquid close to the outer layer of the stirrer to rotate along with the stirrer 1 under the action of viscous force, gravity, surface tension and the like, the glass liquid in the area covered by the left cross rod 12 and the right cross rod 13 and far away from the left vertical rod 14 and the right vertical rod 15 is subjected to vertical convection movement under the rotating influence of the left cross rod 12 and the right cross rod 13, and the uneven rapid stretching, thinning and cutting inside the glass liquid are realized through the above movement of the glass liquid, so that the stirring homogenization effect of the glass liquid is realized. In between, the inner layer 19 of the stirrer 1 provides the structural force supporting function and the heat cooling function of the outer layer 17 and the middle layer 18 of the whole stirrer 1, so that the shape of the stirrer 1 is kept from being obviously deformed, and the service life of the stirrer 1 can be prolonged.

The outer layer 17 of the stirrer 1 is made of a noble metal material which can be used for resisting the erosion of the molten glass to the stirrer 1, meanwhile, the overall shape of the stirrer 1 is kept, the pollution of a stirrer material to the molten glass is reduced, and the service life of the stirrer 1 is prolonged. The thickness of the outer layer 17 is 0.5mm to 1.8mm, and the optimum thickness is 0.8mm to 1.0 mm. The outer layer 17 can be made of platinum metal with stable high-temperature performance, or can be made of platinum-rhodium alloy or platinum-rhodium dispersion material with more excellent strength and stable high-temperature performance, wherein the content of rhodium is 5-15% (weight percentage content, the same below), and the optimal content is 8-12%. The outer layer 17 can also be made of platinum alloy which has excellent strength and stable high-temperature performance and can improve the wetting angle of the glass liquid to the outer layer 17, wherein the content of gold is 2-12%, the optimal content is 5-8%, and the improvement of the wetting angle is beneficial to reducing the adhesion amount of the glass liquid on the outer layer 17 and preventing crystallization.

The intermediate layer 18 of the stirrer 1 is made of a refractory material, and in order to prevent the refractory material from losing its effect, the intermediate layer 18 is preferably made of a refractory material having an upper temperature limit of more than 1600 ℃ and a density of less than 2000kg/m at normal temperature, taking into account that the temperature of the molten glass of the stirrer 1 is not lower than 1550 ℃ when the stirrer 1 is operated in the stirring chamber 2³. The intermediate layer 18 serves to reduce heat loss from the molten glass on the stirrer 1 at high temperatures, and at the same time functions as the noble metal material of the outer layer 17The supporting function prevents the noble metal material of the outer layer 17 from deforming and damaging in the using process, which affects the stirring efficiency and the service life of the stirrer 1.

The inner layer 19 of the stirrer 1 is a cooling zone, consisting of cooling tubes and a cooling medium. The cooling medium is filled in the cooling pipe to provide a cooling source for the stirrer 1, so that the integral temperature of the stirrer 1 is controllable, and the structural strength is controllable. On the other hand, the inner layer 19 provides structural stress support for the whole stirrer 1, and a fulcrum 20 is arranged outside the inner layer 19 at intervals and used for bearing the weight of the middle layer 18 and indirectly bearing the weight of the outer layer 17; while the anchors 20 also serve to enhance the heat exchange between the inner layer 19 and the intermediate layer 18. The cooling pipe can be made of materials with strong heat resistance, good heat transfer and high mechanical structure strength according to the use environment. The inner layer 19 may be of a sleeve construction, which may be of a large sleeve and small tube concentric or eccentric circular tube design, as shown in figure 3, or the inner layer 19 may be of a separate multi-tube construction, as shown in figure 4. In the jacket construction, except at the joint, mainly the large pipe 191 is in contact with the intermediate layer 18, the large pipe 191 is filled with the outer cooling medium, the small pipe 192 is filled with the inner cooling medium, and the cooling medium can enter the stirrer 1 from the inner small pipe 192 and flow out of the stirrer 1 from the outer large pipe 191 during operation, or vice versa. The individual multi-tube configuration employs separate inlet and outlet cooling tubes, so that the inlet and outlet cooling tubes may be multiple and in direct contact with the intermediate layer 18, with an inlet and outlet individual two-tube configuration being shown in fig. 4. The cooling medium can be selected from common cooling media such as air, water and the like, and through experimental and theoretical analysis, the inventor prefers deionized circulating water as the cooling medium, wherein the highest outlet temperature of the cooling water is not more than 80 ℃, and the preferred outlet temperature of the cooling water is less than 60 ℃. The diameter of the cooling pipe can be determined according to the temperature of the outer layer 17 of the stirrer 1, the temperature difference between the outer cooling medium and the inner cooling medium, the heat conductivity coefficient of the material, the weight of the stirrer 1 and other parameters.

The outer shapes of the central shaft 11, the left cross bar 12, the right cross bar 13, the left vertical bar 14 and the right vertical bar 15 of the stirrer 1 can be selected from polygonal, circular and other cross-sectional shapes, but the preferred outer shape is a circular cross-sectional structure from the viewpoint of material processing and stress. In the case of a blender 1 having a bottom rail 16, the profile of the bottom rail 16 is also preferably a circular cross-sectional configuration. In one embodiment, the outer surfaces of the left cross bar 12, right cross bar 13, left vertical bar 14, right vertical bar 15 and bottom cross bar 16 are all in contact with molten glass, and the molten glass is homogenized by the rotation of the stirrer 1; in another embodiment, a plurality of small prisms, cylinders or cones are uniformly arranged on the outer surface of the left cross bar 12, the right cross bar 13, the left vertical bar 14, the right vertical bar 15 and the bottom cross bar 16, and the contact surface with molten glass can be increased through the small prisms, cylinders or cones when the stirrer 1 stirs, so that the efficiency of the stirrer 1 is improved. The above-mentioned small prisms, cylinders or cones are preferably within 30mm in height and have a diameter of 5mm to 20mm in the contact surface with the outer layer 17 of the stirrer 1.

The left vertical rod 14 and the right vertical rod 15 of the stirrer 1 are respectively basically vertical to the left cross rod 12 and the right cross rod 13; the left cross bar 12 and the right cross bar 13 are respectively basically vertical to the central shaft 11. The cross-sectional area of the stirrer 1 at all positions should be kept consistent as much as possible, so that the local structural strength is prevented from being reduced due to the excessive local temperature difference.

The maximum length L of the left vertical bar 14 and the right vertical bar 15 of the stirrer 1 is 0.3-0.8, preferably 0.4-0.7 of the height of the molten glass level line 3 in the stirring chamber 2. Wherein, the maximum length L is the value of the longer one of the left vertical bar length and the right vertical bar length, and the length of the shorter one is 0.3L-L. In the length design of the left cross bar 12 and the right cross bar 13, the lengths of the two cross bars can also be designed to be unequal, and the length of the shorter cross bar is preferably not less than 0.3 of the length of the longer cross bar.

The left cross bar 12 and the right cross bar 13 may be connected to the left vertical bar 14 and the right vertical bar 15 at arbitrary positions in the longitudinal direction thereof, respectively. The inventors have shown through extensive experimental studies that the preferred attachment sites are of three types: the first is that a left cross bar 12 and a right cross bar 13 are respectively connected with a left vertical bar 14 and a right vertical bar 15 at the highest points of the left vertical bar 14 and the right vertical bar 15, as shown in fig. 1; the second one is that the left cross bar 12 and the right cross bar 13 are respectively connected with the left vertical bar 14 and the right vertical bar 15 at the lowest points of the left vertical bar 14 and the right vertical bar 15, and the central shaft 11 of the stirrer 1, the left cross bar 12, the right cross bar 13, the left vertical bar 14 and the right vertical bar 15 form a structure similar to a Chinese character 'shan'; the third is that the left cross bar 12 and the right cross bar 13 are respectively connected with the middle points of the left vertical bar 14 and the right vertical bar 15 in the length direction of the left vertical bar 14 and the right vertical bar 15, at the moment, the lengths of the left vertical bar 14 and the right vertical bar 15 are respectively divided equally by the left cross bar 12 and the right cross bar 13, the flow field formed by the method forms vertical-direction vertical convection in the area outside the length coverage of the left cross bar 12 and the right cross bar 13 and is distributed basically symmetrically with the left cross bar 12 and the right cross bar 13, and the glass liquid area inside the length coverage of the left cross bar 12 and the right cross bar 13 can also generate vertical convection motion.

The minimum distance w between the outer layer surfaces of the left vertical rod 14 and the right vertical rod 15 and the side wall 21 of the stirring chamber 2 is 0.11-0.25 of the diameter of an inscribed circle formed by the side wall 21 of the stirring chamber 2, so that the stirring efficiency can be improved, and the defect that part of precious metal materials enter glass liquid to form precious metal scattering point impurities with the size of below 40 micrometers when the outer layer 17 of the stirrer 1 works in the glass liquid for a long time is prevented.

The minimum distance m between the bottom surfaces of the left vertical rod 14 and the right vertical rod 15 and the bottom wall 22 of the stirring chamber 2 is within 100 mm; when a mixer 1 with a bottom rail 16 is used, the minimum distance between the outer surface of the bottom rail 16 and the bottom wall 22 of the mixing chamber 2 is within 100 mm.

Expansion areas are arranged on the outer layers 17 of the left cross bar 12, the right cross bar 13 and the bottom cross bar 16 of the stirrer 1 and are used for controlling the expansion and creep deformation of the noble metal material of the outer layers 17 at high temperature and preventing structural damage. Typically the expansion zones are comprised of a plurality of expansion loops, each having a length of from 0.3 to 0.6 of the length of the cross-bar at that location, the maximum distance between the peaks and troughs of the expansion loops not exceeding 12mm, preferably 5 to 10 mm.

A cover plate 4 is arranged at a top hole 24 at the upper end of a central shaft 11 of the stirrer 1, the cover plate 4 is a circular disc with an L-shaped section, and the cover plate 4 surrounds the central shaft 11 to prevent cold and hot gas at the top hole 24 on the stirring chamber 2 from convecting to form volatile condensate and falling into molten glass to form impurity defects. The diameter of the cover plate 4 is larger than that of the top hole 24, and the height of the cover plate 4 is 5-10 mm.

The present invention can provide the following method for improving the quality of molten glass by using the stirring apparatus having the above structure.

A method for modifying the quality of a molten glass, the method comprising the steps of:

1) before the stirring device works and in the whole stirring process, the flow of the cooling medium in and out of the inner layer 19 of the stirrer 1 is always kept stable, and the temperature difference between the cooling medium in and out is controlled to meet the requirement;

2) when the continuous melting is adopted to produce the ultra-high temperature glass, the glass liquid is input into the stirring chamber 2 from the glass liquid inlet 27 and reaches the stable liquid level line of the process design; when the discontinuous melting production is adopted, the stirring chamber 2 also plays a role of a melting tank, powder of glass components, a mixture of the powder and glass slag or glass liquid can be input into the stirring chamber 2 through the glass liquid inlet 27, when the glass liquid in the stirring chamber 2 has stirring conditions, the stirrer 1 is placed into the glass liquid, and at the moment, the glass liquid level reaches a stable liquid level line of process design. Controlling the temperature of the glass liquid to reach or exceed 1550 ℃ in the stirring and homogenizing process, so that the glass liquid is in a viscosity range capable of homogenizing and eliminating stripes;

3) the stirrer 1 rotates clockwise or anticlockwise at a constant speed according to design requirements, so that the glass metal in the stirring chamber 2 generates forced convection, the movement of the glass metal in the stirring chamber 2 along with the stirrer 1 can be divided into three conditions, the first condition is that the glass metal near the outer layer surface of the stirrer generates rotary motion, and the region with the maximum speed generates a glass metal adhesive layer on the outer layer surface of the stirrer; the second is that the glass liquid in the area covered by the left cross bar 12, the right cross bar 13 and the bottom cross bar 16 partially presents the movement of up-down convection near the center line; the third is that the glass liquid outside the area covered by the left vertical rod 14 and the right vertical rod 15 generates fluid section change when the left vertical rod 14 and the right vertical rod 15 move relative to the side wall of the stirring chamber, so that the fluid extrusion effect is formed, and the glass liquid is enabled to move in a regular up-and-down convection manner. Through the three movement modes, the internal mixing and diffusion effects of the molten glass in the stirring chamber 2 are obviously improved;

4) the glass liquid is influenced by the stirring circulation in the stirring chamber 2, the retention time is greatly increased, so that the influence of the heterogeneous glass liquid is gradually reduced, when the uniformity of the glass liquid reaches the technical requirement of the product, the glass liquid is homogenized in the stirring chamber 2 and discharged from a glass liquid outlet 25 to enter the next production procedure.

By adopting the quality improvement method of the glass metal, the convection efficiency of the glass metal in the stirring chamber can be effectively improved in a mechanical stirring mode; simultaneously through the effect of left horizontal pole 12, right horizontal pole 13, left montant 14, right montant 15 and end horizontal pole 16 of agitator 1, the inside inhomogeneous of glass liquid is discretized into a large amount of small pieces gradually, and the dispersion is in the glass liquid region in whole teeter chamber 2 to through the diffusion of the internal molecule of glass liquid, dissolve and the agitator mixes, the homogeneity of glass liquid is promoted.

In the method for improving the quality of the molten glass, the rotating speed of the stirrer directly influences the convection efficiency of the molten glass in the area, and meanwhile, too high stirring speed can also cause the amount of the noble metal particles on the outer layer of the stirrer entering the molten glass to be increased, so that the stirring speed needs to be reasonably controlled between 0.5 rpm and 30 rpm, and preferably between 0.5 rpm and 15 rpm. In the stirring process, the rotation speed of the stirrer should be kept rotating at a constant speed, and the sudden change of the speed easily causes local fatigue and structural deformation of the stirrer, so that the service life of the stirrer is influenced.

In the method for improving the quality of the molten glass, in order to keep the molten glass in the coverage areas of the left cross rod 12 and the right cross rod 13 to have proper up-down convection circulation, the outer layer surfaces of the left cross rod 12 and the right cross rod 13 are controlled to be completely immersed in the molten glass, and the requirements on the positions from the liquid level of the molten glass to the highest points of the left cross rod 12, the right cross rod 13, the left vertical rod 14 and the right vertical rod 15 are made according to the connection modes of the left cross rod 12 and the right cross rod 13 with the left vertical rod 14 and the right vertical rod 15 respectively. When the first connection mode is adopted, the distance d between the outer layer surfaces of the left cross bar 12 and the right cross bar 13 and the glass liquid level is 0.1-0.6L, and the preferable distance d is 0.3-0.6L. The left cross rod 12 and the right cross rod 13 are designed to be parallel to the glass liquid level line 3, and when the distance d is too large, the up-down convection effect is obviously weakened due to the fact that the glass liquid amount above the left cross rod 12 and the right cross rod 13 of the stirrer 1 is too large; when the distance d is too small, no vertical convection is formed, and the stirring efficiency is also remarkably reduced. When the second connection mode or the third connection mode is adopted, the distance d from the highest point of the left vertical rod 14 and the right vertical rod 15 to the glass liquid level is 0.1-0.8L, and the preferable distance d is 0.3-0.6L.

In the method for improving the quality of the molten glass, the stable cooling medium in the inner layer of the stirrer controls the overall temperature of the stirrer, reduces the quantity of noble metal particles falling off from the surface of the stirrer and entering the molten glass, and is beneficial to reducing the problem of impurity defects caused by a stirring process; meanwhile, the viscosity of the glass liquid near the stirrer is slightly increased compared with other areas due to the cooling effect of the cooling medium, so that the speed transmission of the glass liquid close to the surface of the stirrer during the rotation of the stirrer is facilitated, the influence range of the stirring area is indirectly increased, and the homogenization effect of the stirrer on the glass liquid is facilitated to be improved.

The method is particularly suitable for the production operation of the ultra-high temperature glass with the inscribed circle diameter of more than 600mm in the stirring chamber, and is particularly suitable for the internal uniformity quality improvement of the ultra-high temperature glass with the homogenization temperature of more than 1550 ℃ such as borosilicate glass, aluminosilicate glass, special color glass and the like.