Low-swing high-efficiency homogenizing stirring structure and stirring method

Abstract

The invention discloses a low-swing high-efficiency homogenizing stirring structure and a stirring method, and fully considers that single-side glass flows into a stirring tank, nonuniform acting force is generated on a stirrer, long-term stable operation of the stirrer is influenced, and single-side flowing-in glass liquid is easy to form a viscosity-temperature segregation phenomenon at a near end; and the influence on the homogenization effect is weakened. The acting force transition of fluid before the fluid enters the stirring tank body is realized by adding the special-shaped buffer pool, and molten glass is continuously injected into the stirring tank in a 360-degree overflow manner, so that the rotation stability of the whole stirrer is remarkably improved, and full guarantee is provided for long-life reliability and high-flow efficient homogenization of equipment. According to the stirrer, uniform stress of molten glass on the stirrer in the circumferential direction can be realized, the problem of abnormal swinging of the stirrer in the operation process is remarkably improved, high-flow molten glass is efficiently homogenized, and an equipment guarantee is provided for manufacturing of high-flow substrate glass.

Description

Technical Field

[0001] The invention belongs to the technical field of substrate glass production, and relates to a low-swing high-efficiency homogenizing stirring structure and a stirring method. Background Art

[0002] The manufacturing core of substrate glass is located at the hot end, including the kiln, platinum channel and forming area. The average temperature of the entire hot end area is as high as 1500℃, and some areas even reach 1650℃, which poses great challenges to the stability and long-term life of the equipment. Among them, the stirring system located in the platinum channel area is mainly responsible for the homogenization of the composition and texture of the glass liquid after high-temperature clarification. With the agitator as the core component, the glass liquid in the stirring tank is stretched and sheared in real time through continuous and uniform rotation to achieve high-quality glass output. The stirring system commonly used in the industry at present mainly forms a connecting channel for glass liquid through a vertically distributed stirring tank and a transition pipe connected to one side, but this structure has defects, that is, the injection of glass liquid on one side will produce a unidirectional force on the rotation of the agitator, and as the glass flow rate continues to increase, this phenomenon becomes more and more significant. Generally, in the later stage of production, the overall stirring mechanism will be fatigued and deformed due to long-term operation of some components, which will further aggravate the abnormal swing of the agitator and even cause equipment safety problems. In addition, the one-sided glass injection will also cause the problem of glass viscosity-temperature segregation during the stirring process, that is, too much high-density glass will flow in close to one side of the inlet, which will have a certain impact on the overall homogenization effect of the glass liquid. Summary of the invention

[0003] The purpose of the present invention is to solve the stability problem caused by the unilateral effect of the glass fluid on the agitator and the viscosity-temperature segregation problem of the glass liquid near the inflow side in the channel stirring system in the prior art, and to provide a low-swinging, high-efficiency, homogenizing stirring structure and stirring method.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention proposes a low-swing high-efficiency homogenizing stirring structure, which comprises a stirring inlet pipe and a stirring tank, wherein the stirring tank comprises a buffer tank and a stirring container; the stirring container is connected and installed below the buffer tank, and the stirring inlet pipe is connected and installed on the wall of the buffer tank; an agitator is arranged in the stirring tank.

[0005] Preferably, the stirrer comprises a stirring shaft and a first stirring blade, and the first stirring blade is mounted on the stirring shaft.

[0006] Preferably, there are a plurality of first stirring blades, and the plurality of first stirring blades are installed on the stirring shaft at equal intervals.

[0007] Preferably, a second stirring blade is also mounted on the stirring shaft, and the second stirring blade is in an inverted L-shape.

[0008] Preferably, there are a plurality of second stirring blades, which are installed at equal intervals in the circumferential direction of the stirring shaft, and the thickness of the second stirring blades is in the range of 8 mm to 12 mm.

[0009] Preferably, the installation height of the stirring inlet pipe is lower than that of the stirring container.

[0010] Preferably, the installation height difference between the stirring inlet pipe and the stirring container ranges from 5 mm to 20 mm.

[0011] Preferably, the diameter of the stirring container ranges from 330 mm to 380 mm, the diameter of the buffer tank ranges from 410 mm to 600 mm, and the height of the buffer tank ranges from 160 mm to 200 mm.

[0012] Preferably, the buffer tank is a U-shaped structure.

[0013] The present invention provides a stirring method for a low-swing high-efficiency homogenizing stirring structure, comprising: The stirring inlet pipe is installed on the buffer tank to buffer the glass liquid flowing into the stirring inlet pipe; The buffered glass liquid enters the stirring container under the action of the stirrer; Under the action of the stirring container, the glass liquid is made to flow in 360 degrees to achieve stirring.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention proposes a low-swing high-efficiency homogenizing stirring structure. Considering the way that the glass liquid enters the stirring tank, the original structure changes the direct inflow of the glass liquid on one side into a buffered dispersed inflow, so that the unilateral force of the glass liquid on the stirrer is changed to a uniform force in the circumferential direction, which will effectively improve the negative impact of the glass liquid on the operation stability of the entire stirrer. Based on this principle, the present invention fully considers the uneven force generated by the glass liquid flowing into the stirring tank from one side, which affects the long-term stable operation of the stirrer, and the glass liquid flowing from one side is prone to form a viscosity-temperature segregation phenomenon at the near end, which has a weakening effect on the homogenization effect. By adding a special-shaped buffer tank to achieve the force transition of the fluid before entering the stirring tank body, the glass liquid is continuously injected into the stirring tank in a 360° overflow manner, which has a significant improvement on the rotational stability of the entire stirrer, and provides full guarantee for the long-life reliability of the equipment and high-efficiency homogenization of large flow. It can achieve uniform force of the glass liquid on the stirrer in the circumferential direction, significantly improve the abnormal swing problem of the stirrer during operation, and high-efficiency homogenization of large flow glass liquid.

[0015] Furthermore, the independent second stirring blade designed on the upper part of the stirrer has a preliminary stabilizing effect on the overflowing glass liquid on the upper layer, providing a good basic condition for the formal stirring and homogenization below. The structure of the present invention can realize stirring equipment and process effects with larger flow, higher stability and life in the future.

[0016] Furthermore, the top of the stirring inlet pipe is slightly lower than the top of the standard stirring part. Considering the pressure loss height formed by the system glass liquid, the top of the stirring inlet pipe is generally 5mm to 20mm lower than the top of the standard stirring part, so that the glass liquid from the stirring inlet pipe first enters the special-shaped buffer tank, and when the new glass liquid accumulates to the upper edge of the special-shaped buffer tank, it overflows into the standard stirring part evenly along the circular interface. At this time, no unilateral glass driving force is generated for the agitator. Specifically, in the traditional unilateral glass liquid inflow stirring method, the stirring tank is vertically distributed, and the glass liquid flows into the tank from the horizontal tube on one side. There will be a unidirectional thrust for the agitator, affecting the stability of the stirring. Therefore, the structure of the special-shaped buffer tank of the present invention can effectively improve this problem.

[0017] Furthermore, the material of the second stirring blade is exactly the same as the main structure of the agitator, generally a reinforced platinum-rhodium alloy material with sufficient strength and high corrosion resistance. The overall thickness of the blade is 8mm to 12mm, and the shape is an inverted "L" shape with the bending direction facing downward, which plays a role in drainage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the low-swing high-efficiency homogenizing stirring structure of the present invention; Figure 2 It is an overall schematic diagram of the special-shaped stirring tank of the present invention; Figure 3 This is a schematic diagram of the traditional stirring method of glass liquid flowing into one side; Figure 4 The stirrer of the present invention is provided with an additional top independent blade; Figure 5 It is the operating principle and function schematic diagram of the present invention.

[0020] In the figure: 1 is a stirring inlet pipe; 2 is a stirring tank; 3 is a stirrer; 4 is a drainage electrode; 5 is a buffer tank; 6 is a stirring container; 7 is a stirring shaft; 8 is a first stirring blade; 9 is a second stirring blade; 10 is glass liquid; 11 is glass liquid with viscosity-temperature segregation. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings: The present invention proposes a low-swing high-efficiency homogenizing stirring structure, such as Figures 1 to 5 As shown, it includes a stirring inlet pipe 1 and a stirring tank 2, and the stirring tank 2 includes a buffer tank 5 and a stirring container 6; the stirring container 6 is connected and installed below the buffer tank 5, and the stirring inlet pipe 1 is connected and installed on the wall of the buffer tank 5; an agitator 3 is provided in the stirring tank 2. The buffer tank 5 is a U-shaped structure. The special-shaped buffer tank adopts a circular tube body, and the overall tube diameter must be greater than or equal to 25% to 60% of the standard stirring tank tube diameter. The buffer tank 5 is generally circular, and the cross-sectional shape is a rotating body that is approximately "U" shaped, and has the function of a container that can accommodate glass.

[0028] The stirrer 3 includes a stirring shaft 7 and a first stirring blade 8, and the first stirring blade 8 is installed on the stirring shaft 7. A second stirring blade 9 is also installed on the stirring shaft 7, and the second stirring blade 9 is an inverted L-shape. There are a plurality of first stirring blades 8, and a plurality of first stirring blades 8 are installed on the stirring shaft 7 at equal intervals. There are a plurality of second stirring blades 9, and a plurality of second stirring blades 9 are installed at equal intervals in the circumferential direction of the stirring shaft 7, and the thickness of the second stirring blade 9 ranges from 8 mm to 12 mm.

[0029] The installation height of the stirring inlet pipe 1 is lower than that of the stirring container 6. The installation height difference between the stirring inlet pipe 1 and the stirring container 6 is in the range of 5 mm to 20 mm. The diameter of the stirring container 6 is in the range of 330 mm to 380 mm, the diameter of the buffer tank 5 is in the range of 410 mm to 600 mm, and the height of the buffer tank 5 is in the range of 160 mm to 200 mm.

[0030] refer to Figure 1 , is a schematic diagram of the overall method of the present invention, the main structure includes a stirring inlet pipe 1, a stirring tank 2, an agitator 3, and a drainage electrode 4, wherein the core design scheme of the present invention is the stirring tank 2 and the agitator 3 and the method based thereon, the stirring inlet pipe 1 is a necessary structure of the original scheme, the drainage electrode 4 is a heating electrode also existing in the original structure, and a complete loop is formed by a group of upper and lower groups to input current to the entire stirring tank.

[0031] refer to Figure 2 , is a specific structural scheme of the stirring tank 2, mainly including the special-shaped buffer tank 5 and the stirring container 6 of the stirring tank 2. As can be seen from the figure, the top of the stirring inlet pipe 1 is slightly lower than the top of the stirring container 6. Considering the pressure loss height formed by the system glass liquid, the top of the stirring inlet pipe 1 is generally 5mm to 20mm lower than the top of the stirring container 6, so that the glass liquid from the stirring inlet pipe 1 first enters the special-shaped buffer tank 5, and when the new glass liquid accumulates to the upper edge of the special-shaped buffer tank 5, it overflows into the stirring container 6 evenly along the circular interface. At this time, no similar pressure drop will occur to the stirrer 3. Figure 3 The unilateral glass driving force shown is specifically a traditional unilateral glass liquid inflow stirring method, in which the stirring tank 2 is vertically distributed, and the glass liquid 10 flows into the tank from a horizontal tube on one side. There will be a unidirectional thrust on the agitator 3, affecting the stability of the stirring. Therefore, the structure of the special-shaped buffer tank 5 of the present invention can effectively improve this problem.

[0032] The special-shaped buffer tank 5 needs to be processed separately. It is formed by a mold once and then partially adjusted in structure. Finally, it is welded with the stirring container 6. Both materials are made of platinum-rhodium alloy, in which the Rh content is generally controlled in the range of 10% to 25%, which can ensure the machinability of the material and sufficient high-temperature strength.

[0033] The current diameter of the stirring container 6 is generally in the range of 330mm to 380mm depending on the glass flow rate, and the maximum diameter of the special-shaped buffer tank 5 is generally designed to be in the range of 410mm to 600mm relative to the diameter of the stirring container 6. The height of the buffer tank 5 where the glass liquid is located is about 160mm to 200mm, and it can maintain a residence time of about 40s to 100s, so that the glass liquid can form a relatively stable state and then overflow into the stirring container 6.

[0034] 1. For the new glass liquid that has just overflowed into the stirring container 6, it is necessary to carry out preliminary horizontal stirring in order to ensure the uniform flow of the glass liquid in the circumferential direction. Based on the present invention, a stirrer 3 with a second stirring blade 9 on the top is designed, and its structure is as follows: Figure 4As shown, a separate paddle is added to the traditional agitator. The stirring length of the second stirring blade 9 is larger than the diameter of the main stirring blade 8 below, and the gap from the stirring container 6 is generally designed to be 15mm, which can achieve maximum stirring of the overflow glass. The material of the second stirring blade 9 is completely consistent with the main structure of the agitator, generally a reinforced platinum-rhodium alloy material, with sufficient strength and high corrosion resistance. The overall thickness of the blade reaches 8mm to 12mm, and the shape is an inverted "L" shape, with the bending direction facing downward, which plays a role in drainage, and the rotation range is 80% to 90% of the diameter of the standard stirring tank. The second stirring blade 9 is welded to the stirring shaft 7, and one or 2 to 6 equal-spaced blades can be arranged in the circumferential direction. By combining the second stirring blade 9 with the special-shaped buffer tank 5, the glass liquid entering the stirring container 6 can be fully diverted and stirred, which can eliminate the following problems: Figure 3 The viscosity-temperature segregated glass liquid 11 near the single-side incoming material side shown in the figure is a glass with excessively high viscosity and density, which is different from most glass liquids. These abnormal glasses have adverse effects on the overall glass quality.

[0035] The special-shaped buffer tank 5 designed by the present invention evenly disperses the glass liquid flowing into the stirring container 6 in the circumferential direction, and the lateral force generated by the stirrer 3 is also changed from the original unilateral distribution to a symmetrical distribution, such as Figure 5 As shown, the viscosity-temperature segregated glass liquid 11 basically does not produce a biased force on the agitator 3, but a symmetrical force along the circumferential direction, which makes the overall operation of the agitator more stable. Especially after running for more than 3 years at a large flow rate, the swing amount will still not exceed 2 mm. This will provide sufficient guarantee for the subsequent design of larger production capacity equipment and longer life reliability equipment for industrial application.

[0036] The present invention provides a stirring method for a stirring structure with low swing and high efficiency homogenization, comprising the following steps: Step 1, installing the stirring inlet pipe 1 on the buffer tank 5, and performing buffering treatment on the glass liquid flowing into the stirring inlet pipe 1; Step 2, the buffered glass liquid enters the stirring container 6 under the action of the stirrer 3; Step 3: Under the action of the stirring container 6, the glass liquid is made to flow in a 360° direction to achieve stirring.

[0037] Specific: Between the stirring inlet and the stirring tank body, the flow rate and flow direction of the columnar glass liquid flowing in from one side are buffered; the glass melt does not directly enter the stirring tank, but forms a horizontally distributed circulation on its upper part; the circulation accumulates and then overflows, so that the glass liquid flows into the stirring tank in a 360° direction; the glass liquid that has just overflowed is stabilized by local stirring again. The flow rate of the glass liquid is in the range of 1000kg / h to 1300kg / h. The temperature of the glass liquid is controlled at 1400℃ to 1460℃. The flow rate of the columnar glass liquid flowing in from one side is 3mm / s to 6mm / s. The buffering treatment of the flow rate and flow direction is to lower the height of the stirring inlet to below the upper edge of the standard stirring tank, and pre-set an independent glass space, so that the glass liquid that is about to flow into the standard stirring tank is first buffered through the space, and then flows into the standard stirring tank. The buffer tank can accommodate about 50kg to 150kg of glass liquid.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low-swing high-efficiency homogenizing stirring structure, characterized in that: The invention comprises a stirring inlet pipe (1) and a stirring tank (2), wherein the stirring tank (2) comprises a buffer tank (5) and a stirring container (6); the stirring container (6) is installed in communication below the buffer tank (5), and the stirring inlet pipe (1) is installed in communication on the wall of the buffer tank (5); and a stirrer (3) is provided in the stirring tank (2).

2. The low-swing high-efficiency homogenizing stirring structure according to claim 1, characterized in that: The stirrer (3) comprises a stirring shaft (7) and a first stirring blade (8), wherein the first stirring blade (8) is mounted on the stirring shaft (7).

3. The low-swing high-efficiency homogenizing stirring structure according to claim 2, characterized in that: There are a plurality of first stirring blades (8), and the plurality of first stirring blades (8) are installed on the stirring shaft (7) at equal intervals.

4. The low-swing high-efficiency homogenizing stirring structure according to claim 2, characterized in that: A second stirring blade (9) is also mounted on the stirring shaft (7), and the second stirring blade (9) is in an inverted L-shape.

5. The low-swing high-efficiency homogenizing stirring structure according to claim 4, characterized in that: There are a plurality of second stirring blades (9), which are installed at equal intervals in the circumferential direction of the stirring shaft (7), and the thickness of the second stirring blades (9) ranges from 8 mm to 12 mm.

6. The low-swing high-efficiency homogenizing stirring structure according to claim 1, characterized in that: The installation height of the stirring inlet pipe (1) is lower than that of the stirring container (6).

7. The low-swing high-efficiency homogenizing stirring structure according to claim 6, characterized in that: The installation height difference between the stirring inlet pipe (1) and the stirring container (6) ranges from 5 mm to 20 mm.

8. The low-swing high-efficiency homogenizing stirring structure according to claim 1, characterized in that: The diameter of the stirring container (6) is in the range of 330 mm to 380 mm, the diameter of the buffer tank (5) is in the range of 410 mm to 600 mm, and the height of the buffer tank (5) is in the range of 160 mm to 200 mm.

9. The low-swing high-efficiency homogenizing stirring structure according to claim 1, characterized in that: The buffer pool (5) is a U-shaped structure.

10. A stirring method of a stirring structure with low swing and high efficiency homogenization, characterized in that: The stirring structure with low swing and high efficiency homogenization according to any one of claims 1 to 9 comprises: The stirring inlet pipe (1) is installed on the buffer tank (5) to perform buffering treatment on the glass liquid flowing into the stirring inlet pipe (1); The glass liquid that has been buffered enters the stirring container (6) under the action of the stirrer (3); Under the action of the stirring container (6), the glass liquid is caused to flow in a 360-degree direction to achieve stirring.

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