A high-viscosity solid-liquid mixture stirring device

Abstract

The utility model relates to the technical field of stirring, specifically relates to a high viscosity solid -liquid mixture stirring device. The utility model relates to a high viscosity solid -liquid mixture stirring device, including reation kettle and hollow stirring shaft, the hollow part of hollow stirring shaft is set up as high pressure gas flow channel, the hollow stirring shaft drives upper stirring device, middle stirring device and bottom stirring device from top to bottom in proper order, at least one of upper stirring device, middle stirring device and bottom stirring device is hollow structure and is communicated with high pressure gas flow channel and is provided with air hole. The high viscosity solid -liquid mixture stirring device provided by the utility model, upper stirring device, middle stirring device and bottom stirring device three layers of stirring device can make solid -liquid material of reation kettle get fully mixed, and the air hole structure arranged on the stirring device can form high pressure gas flow in the stirring process, further accelerate the mixing of material even and prevent the agglomeration of inorganic functional adjuvant.

Description

Technical Field

[0001] This utility model relates to the field of stirring technology, specifically to a stirring device for high-viscosity solid-liquid mixtures. Background Technology

[0002] Polyvinyl butyral (PVB) is formed by the condensation of polyvinyl alcohol (PVA) and butyraldehyde under acid (usually inorganic acid) catalysis. PVB resin contains long branched chains, exhibiting good impact and tensile strength, as well as excellent transparency and film-forming properties. It is widely used in the manufacture of interlayer films for laminated glass, encapsulation films for photovoltaic double-glass modules, and ceramic adhesives.

[0003] With the increasing technical requirements of various products, simple polyvinyl acetal resin can no longer meet practical needs. In existing technologies, inorganic functional additives are generally added during the synthesis of polyvinyl acetal resin to enhance its functionality. Simultaneously, to meet the actual application requirements of the products, high-viscosity raw materials and intermediates or products are needed. This increases the difficulty of stirring, leading to uneven mixing and poor dispersibility of inorganic functional additives, resulting in incomplete reactions and poor stability and uniformity of the reaction products.

[0004] To address the above problems, there is an urgent need to invent a stirring device for high-viscosity solid-liquid mixtures to solve the problem of uneven mixing of high-viscosity solid-liquid mixtures. Utility Model Content

[0005] This invention provides a stirring device for high-viscosity solid-liquid mixtures, with the aim of providing a novel mixing and stirring device that can uniformly mix high-viscosity solids and liquids, save energy, and is highly efficient.

[0006] To achieve the above objectives, the present invention adopts the following technical solution.

[0007] A high-viscosity solid-liquid mixture stirring device includes a reaction vessel and a hollow stirring shaft. The hollow part of the hollow stirring shaft is configured as a high-pressure gas flow channel. The hollow stirring shaft drives an upper stirring device, a middle stirring device, and a bottom stirring device in sequence from top to bottom. At least one of the upper stirring device, the middle stirring device, and the bottom stirring device has a hollow structure and is connected to the high-pressure gas flow channel and is provided with air holes.

[0008] According to the high-viscosity solid-liquid mixture stirring device described above, the upper stirring device, the middle stirring device and the bottom stirring device are all hollow structures and are connected to the high-pressure gas flow channel and are provided with air holes.

[0009] According to the high-viscosity solid-liquid mixture stirring device described above, the upper stirring device is provided with the downward air jet hole, the middle stirring device is provided with the upward and / or downward air jet hole, and the bottom stirring device is provided with the upward air jet hole.

[0010] According to the high-viscosity solid-liquid mixture stirring device described above, the upper stirring device and / or the bottom stirring device are elliptical stirring blades, and the middle stirring device is a rectangular stirring blade.

[0011] According to the high-viscosity solid-liquid mixture stirring device described above, a scraper is connected to the free end of the middle stirring device, and the scraper extends vertically towards the bottom and top of the reaction vessel.

[0012] According to the high-viscosity solid-liquid mixture stirring device described above, the scraper has a hollow structure, and the hollow structure of the scraper is connected to the high-pressure gas flow channel of the hollow stirring shaft. The scraper is provided with air holes along its vertical edge, and the gas ejected from the edge air holes of the scraper is along the tangential direction of the circumference of the inner surface of the reactor vessel.

[0013] According to the high-viscosity solid-liquid mixture stirring device described above, the upper part of the hollow stirring shaft is provided with a gas inlet for introducing high-pressure gas, and the gas inlet is connected to a high-pressure gas supply device to supply high-pressure gas into the hollow stirring shaft.

[0014] According to the high-viscosity solid-liquid mixture stirring device described above, the hollow stirring shaft is fixedly connected to the high-pressure gas supply device via a connecting ring, the connecting ring partially covers the gas inlet, and the connecting ring is rotatably and sealingly connected to the hollow stirring shaft; the hollow stirring shaft and the connecting ring are connected via a sealed bearing.

[0015] According to the high-viscosity solid-liquid mixture stirring device described above, the upper stirring device, the middle stirring device, and the bottom stirring device are staggered in their projections on the horizontal plane.

[0016] According to the high-viscosity solid-liquid mixture stirring device described above, the upper stirring device 4 and / or the bottom stirring device 6 and / or the middle stirring device 5 are an even number, and are evenly distributed along the circumference of the hollow stirring shaft; preferably, the upper stirring device and / or the bottom stirring device are two symmetrically arranged elliptical stirring blades, and the middle stirring device is two symmetrically arranged rectangular stirring blades.

[0017] Compared with the prior art, the present invention has the following technical effects: The high-viscosity solid-liquid mixture stirring device provided by this utility model features a three-layer stirring device consisting of an upper stirring device, a middle stirring device, and a bottom stirring device, which enables thorough mixing of solid and liquid materials in the reactor. The upper and lower stirring devices allow the materials to flow in multiple directions, resulting in more thorough mixing and facilitating mass and heat transfer. The pore structure on the stirring device generates a high-pressure airflow during stirring, further accelerating the uniform mixing of materials and preventing the agglomeration of inorganic functional additives. The scraper prevents solid materials from adhering to the wall, avoiding dead corners and improving stirring efficiency. The elliptical and spiral structures of the stirring device reduce energy consumption, achieving energy-saving effects.

[0018] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This diagram shows a structural schematic of a high-viscosity solid-liquid mixture stirring device according to the present invention. Figure 2 This invention relates to a stirring device for high-viscosity solid-liquid mixtures. Figure 1 A schematic cross-sectional view of part A in the middle; Figure 3 This diagram shows the upper stirring device, middle stirring device and lower stirring device of the high viscosity solid-liquid mixture stirring device of this utility model as a projection on the horizontal plane. In the picture: 1. Reactor; 2. Hollow stirring shaft; 3. High-pressure gas flow channel; 4. Upper stirring device; 5. Middle stirring device; 6. Lower stirring device; 7. Scraper; 8. Gas inlet; 9. High-pressure gas supply device; 10. Connecting ring; 11. Sealed bearing; 12. Gas hole. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0022] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0023] In the description of this utility model, it should be understood that the use of terms such as "first" and "second" to define the components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model.

[0024] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] Please see Figure 1-3 A high-viscosity solid-liquid mixture stirring device includes a reaction vessel 1 and a hollow stirring shaft 2. The hollow part of the hollow stirring shaft 2 is configured as a high-pressure gas flow channel 3. The hollow stirring shaft 2 drives an upper stirring device 4, a middle stirring device 5 and a bottom stirring device 6 from top to bottom. At least one of the upper stirring device 4, the middle stirring device 5 and the bottom stirring device 6 has a hollow structure and is connected to the high-pressure gas flow channel 3 and is provided with air holes.

[0026] Specifically, the high-viscosity solid-liquid mixture in this invention refers to a solution with a viscosity above 600 mPa·s containing inorganic functional additive powder. The particle size of the inorganic functional additive powder is 10 nm to 500,000 nm (500 μm), and the content of the inorganic functional additive powder does not exceed 10 wt% (preferably not more than 5 wt%, and even more preferably not more than 2 wt%). The content of the inorganic nano-functional additive powder refers to the mass of the inorganic functional additive divided by the total weight of the solid-liquid mixture. Exemplary functional additives include montmorillonite, alumina, and inorganic pigments. Among them, montmorillonite (MMT) has a unique two-dimensional layered structure, is inexpensive, readily available, and abundant. Modified montmorillonite has strong adsorption capacity and good dispersibility, and can be widely used in the polymer materials industry as an additive for nano-polymer materials to improve impact resistance, fatigue resistance, dimensional stability, and gas barrier properties, thereby enhancing the comprehensive physical properties of the polymer and improving material processing performance. Therefore, it has great potential in the field of polyvinyl alcohol acetal resin modification technology. The content of inorganic functional additive powder should not be too high. Excessive content increases production costs and negatively impacts the subsequent film-forming properties of polyvinyl acetal resin, as well as the optical properties such as haze and light transmittance after film formation. The high-viscosity solid-liquid mixture stirring device provided by this invention introduces high-pressure gas into the solid-liquid mixture through a high-pressure gas channel and vents in a hollow stirring shaft. The pressure of the introduced high-pressure gas is between 0.3 MPa and 5 MPa, determined based on the viscosity of the solid-liquid mixture and the size and content of the inorganic functional additive powder, aiming to generate uniform bubbles within the solid-liquid mixture. The introduced high-pressure gas works synergistically with the mechanical stirring device to form vortices and circulation, eliminating dead zones in the mixing process and making the solid-liquid mixture more uniform. Simultaneously, the high-pressure gas passing through the vents forms numerous small, uniform bubbles. The smaller the bubbles, the larger the total specific surface area, and the greater the contact area between the gas and liquid, greatly promoting the mass transfer efficiency from the gas phase to the liquid phase. The introduction and expansion of the gas also play a role in mixing and heat dissipation. The rising movement of the bubbles disturbs the liquid, keeping the liquid and inorganic functional additive powder in suspension, preventing sedimentation, and making the inorganic functional additive powder more uniformly dispersed. In this embodiment, vents can be provided in one, two, or three of the upper stirring device 4, middle stirring device 5, and bottom stirring device 6. If one of them is provided with a vent, it is preferable to provide a vent in the bottom stirring device; if two of them are provided with vents, it is preferable to provide vents in the middle and bottom stirring devices. In this invention, the high-pressure gas introduced is generally an inert gas such as nitrogen or argon to prevent the high-pressure gas from reacting with the system and affecting the purity of the final product; nitrogen is preferred because it has a lower cost and a density similar to air, and nitrogen can remain in the solid-liquid mixture for a longer time.The pores are evenly distributed on the stirring device, and the pore diameter is between 0.2mm and 5mm, preferably between 0.5mm and 3mm. In this embodiment, the reactor includes a cylindrical reactor body and a reactor lid. The reactor lid is provided with an exhaust port, which can be set separately for exhausting air, or the exhaust port can be externally connected to a one-way valve for one-way exhausting air from the reactor.

[0027] In one specific embodiment, the upper stirring device 4, the middle stirring device 5, and the bottom stirring device 6 are all hollow structures and are connected to the high-pressure gas flow channel 3 and are provided with air holes.

[0028] Specifically, the three-layer stirring device is equipped with vents to create a very powerful and uniform flow field throughout the reactor. The high-pressure gas injected into the three-layer stirring device, combined with the mechanical stirring of the device, ensures that the material in all areas from the bottom of the reactor to the liquid surface is fully agitated, achieving perfect bubble breaking and creating a uniform microbubble cluster. When gas is introduced from the bottom of the reactor, the bubbles collide and coalesce as they rise, forming larger bubbles. These larger bubbles have a small specific surface area and a short residence time in the liquid, resulting in a decrease in gas-liquid contact efficiency. The high-pressure gas injected in the middle and upper layers disperses these larger bubbles. Through multiple vents in the three-layer stirring device, high-pressure gas is injected into the reaction system (high-viscosity solid-liquid mixture) at multiple points. The bottom vents inject gas to perform initial dispersion, breaking up the larger bubbles. The middle and upper vents inject and shear gas again, even three times, along the rising path of the bubbles. This is equivalent to "multiple dispersions" of the bubbles, producing finer and more uniform microbubbles, promoting a faster reaction. It perfectly solves the mixing challenges of high-viscosity or high-solids-content systems. In polymer synthesis, slurry reactions, and other processes, materials often have high viscosity or contain large amounts of solid catalysts. Simply ventilating from the bottom of the reactor may not effectively disperse the gas, and could even cause large bubbles to rise in a "short-circuit," resulting in poor mixing. The three-layer stirring system, combined with three layers of multi-point air intake, provides powerful mechanical shear force and gas expansion force, effectively overcoming viscosity resistance, ensuring uniform suspension of solid particles, preventing sedimentation, and achieving uniform gas dispersion.

[0029] In one specific embodiment, the upper stirring device 4 is provided with a downward air jet hole, the middle stirring device 5 is provided with an upward or / and downward air jet hole, and the bottom stirring device 6 is provided with an upward air jet hole.

[0030] Specifically, gas is injected downwards by the upper stirring device, simultaneously upwards and downwards by the middle stirring device, and upwards by the bottom stirring device. This actively controls the flow field, gas holdup, and gas-liquid residence time throughout the reactor, rather than passively allowing the gas to rise naturally. The injection of airflow from different directions interacts with the flow field generated by the stirring blades, achieving a "customized" mixing effect. The upward injection from the bottom, combined with the synergistic effect of the upward-spraying airflow and the stirring blades, establishes a powerful upward-flowing main circulation in the lower region of the reactor, acting as the "engine" for the fluid movement of the entire reactor. Simultaneous upward and downward air injection in the middle section plays a crucial "bridging" role. The two airflows collide and shear each other around the stirring blades, coupling with the rotational motion of the blades to form a mixing zone with extremely high turbulence intensity. This intense turbulence zone acts like a "bubble pulverizer," further breaking down large bubbles rising from the bottom into extremely fine microbubbles, thereby drastically increasing the gas-liquid contact area. The downward-spraying airflow effectively prevents the rising bubble clusters from directly "short-circuiting" to the liquid surface, forcing the gas to travel a longer path in the liquid phase and significantly extending the gas residence time. The combined effect of microbubbles and high turbulence ensures the uniformity of reactant concentration and temperature, resulting in more homogeneous mixing while avoiding localized overheating or excessively high reactant concentrations. The downward air injection from the top effectively suppresses eddies that may form on the liquid surface, maintaining a stable liquid level. Through the air injection method in this embodiment, the materials throughout the reactor are in a highly uniform state.

[0031] In one specific embodiment, the upper stirring device 4 and / or the bottom stirring device 6 are elliptical stirring blades, and the middle stirring device 5 is a rectangular stirring blade.

[0032] Specifically, the lower elliptical stirring blades generate a powerful axial circulating flow, thoroughly mixing the solid-liquid mixture at the bottom of the reactor and suspending the inorganic functional additive powder. The lower elliptical stirring blades apply a strong upward thrust to the solid-liquid mixture, effectively scouring the bottom of the reactor and ensuring the inorganic functional additive powder remains suspended, preventing it from accumulating and forming dead zones. This also transports the solid-liquid mixture to the upper and middle sections. The middle rectangular stirring blades, rotating at high speed, generate significant resistance to the material, violently throwing the liquid tangentially against the reactor wall, creating a strong radial flow. This results in high shear force and high turbulence, ensuring rapid and uniform mixing of the material in the middle region. The upper elliptical stirring blades control the vortex, promoting the circulation of the overall solid-liquid mixture and carrying surface material into the reactor interior.

[0033] In one specific embodiment, the free end of the central stirring device 5 is connected to a scraper 7, which extends vertically toward the bottom and top of the reactor 1.

[0034] Specifically, when the viscosity of the reactants exceeds a certain value, they tend to stick to the reactor wall, affecting the uniform mixing of the materials and increasing the resistance to stirring, thus increasing energy consumption. A scraper can be used to scrape off the material adhering to the reactor wall. To ensure the scraper can rotate normally, there is a certain gap between the scraper and the reactor wall, with a gap size between 1mm and 10mm; preferably 3-5mm.

[0035] In one specific embodiment, the scraper 7 is a hollow structure, and the hollow structure of the scraper 7 is connected to the high-pressure gas flow channel 3 of the hollow stirring shaft 2. The scraper 7 is provided with air holes along its vertical edge, and the gas ejected from the edge air holes of the scraper 7 is along the tangential direction of the circumference of the inner surface of the reactor 1.

[0036] Specifically, high-pressure gas is ejected tangentially, forming a high-speed "air curtain" or "air knife" on the reactor wall. This air curtain exerts a continuous shearing and pushing force on the viscous material adhering to the reactor wall, acting like an invisible "scraper" to remove material attempting to adhere or already adhering to the reactor wall and allow it to re-enter the main flow. The airflow carries the material on the wall tangentially, and combined with the flow field generated by the scraper, it can better "entrain" the material on the wall into the main reaction zone at the center of the reactor, promoting material mixing and heat exchange.

[0037] In one specific embodiment, the upper part of the hollow stirring shaft 2 is provided with a gas inlet 8 for introducing high-pressure gas, and the gas inlet 2 is connected to a high-pressure gas supply device 9 to provide high-pressure gas into the hollow stirring shaft 2.

[0038] Specifically, the high-pressure gas supply device can be either a high-pressure gas cylinder or an air compressor, depending on the available space.

[0039] In one specific embodiment, please refer to Figure 2 The hollow stirring shaft 2 is fixedly connected to the high-pressure gas supply device 9 via a connecting ring 10. The connecting ring 10 partially covers the gas inlet 8, and the connecting ring 10 is rotatably and sealed to the hollow stirring shaft 2. The hollow stirring shaft 2 and the connecting ring 10 are connected via a sealed bearing 11.

[0040] Specifically, there are two sealed bearings, one above and one below the air inlet. These two bearings support both ends of the connecting ring. A cavity is formed by the two sealed bearings, the inner wall of the connecting ring, and the outer wall of the hollow stirring shaft located between the two bearings. High-pressure gas enters the hollow stirring shaft through this cavity and the air inlet 8. By using two sealed bearings, the connecting ring will not rotate when the hollow stirring shaft rotates at high speed, ensuring the normal delivery of high-pressure gas.

[0041] In one specific embodiment, the projections of the upper stirring device 4, the middle stirring device 5, and the bottom stirring device 6 on the horizontal plane are staggered.

[0042] For details, please refer to Figure 3 The staggered arrangement refers to the fact that there is a certain angle C between the center lines of the projections of the upper stirring device 4, the middle stirring device 5 and the bottom stirring device 6 on the horizontal plane, and the angle C is 60°.

[0043] In one specific embodiment, the number of the upper stirring device 4 and / or the bottom stirring device 6 and / or the middle stirring device 5 is even, and they are evenly distributed around the circumference of the hollow stirring shaft; preferably, the upper stirring device 4 and / or the bottom stirring device 6 are two symmetrically arranged elliptical stirring blades, and the middle stirring device is two symmetrically arranged rectangular stirring blades.

[0044] Specifically, there are an even number of upper, bottom, and middle agitators. An even number of upper agitators (i.e., an even number of elliptical impellers) are evenly distributed around the hollow agitator shaft; an even number of middle agitators (i.e., an even number of rectangular impellers) are evenly distributed around the hollow agitator shaft; and an even number of lower agitators (i.e., an even number of elliptical impellers) are evenly distributed around the hollow agitator shaft. By changing the angle between the elliptical impellers and the horizontal plane, the upper agitators generate a downward thrust, and the lower agitators generate an upward thrust. The rectangular impellers are inclined, meaning they form an angle with the vertical plane.

[0045] In one specific embodiment, the hollow stirring shaft is driven to rotate by a drive system, which may be a servo motor or the like. Furthermore, the rotation direction of the hollow stirring shaft is consistent with the air jet direction of the air holes at the edge of the scraper.

[0046] The above description is only an exemplary embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A stirring device for high-viscosity solid-liquid mixtures, characterized in that, The reactor includes a reactor (1) and a hollow stirring shaft (2). The hollow part of the hollow stirring shaft (2) is configured as a high-pressure gas flow channel (3). The hollow stirring shaft (2) drives an upper stirring device (4), a middle stirring device (5) and a bottom stirring device (6) from top to bottom. At least one of the upper stirring device (4), the middle stirring device (5) and the bottom stirring device (6) is hollow and connected to the high-pressure gas flow channel (3) and is provided with air holes.

2. The stirring device for a high-viscosity solid-liquid mixture according to claim 1, characterized in that, The upper stirring device (4), the middle stirring device (5) and the bottom stirring device (6) are all hollow structures and are connected to the high-pressure gas channel (3) and are provided with air holes.

3. The high-viscosity solid-liquid mixture stirring device according to claim 2, characterized in that, The upper stirring device (4) is provided with the air hole for downward air jetting, the middle stirring device (5) is provided with the air hole for upward and / or downward air jetting, and the bottom stirring device (6) is provided with the air hole for upward air jetting.

4. The high-viscosity solid-liquid mixture stirring device according to claim 3, characterized in that, The upper stirring device (4) and / or the bottom stirring device (6) are elliptical stirring blades, and the middle stirring device (5) is a rectangular stirring blade.

5. The stirring device for a high-viscosity solid-liquid mixture according to claim 4, characterized in that, The free end of the central stirring device (5) is connected to a scraper (7), which extends vertically toward the bottom and top of the reactor (1).

6. The stirring device for a high-viscosity solid-liquid mixture according to claim 5, characterized in that, The scraper (7) has a hollow structure. The hollow structure of the scraper (7) is connected to the high-pressure gas flow channel (3) of the hollow stirring shaft (2). The scraper (7) has air holes along its vertical edge. The gas ejected from the air holes of the scraper (7) is along the tangential direction of the inner surface of the reactor (1).

7. The stirring device for a high-viscosity solid-liquid mixture according to claim 1, characterized in that, The upper part of the hollow stirring shaft (2) is provided with a gas inlet (8) for introducing high-pressure gas. The gas inlet (2) is connected to the high-pressure gas supply device (9) to supply high-pressure gas into the hollow stirring shaft (2).

8. A stirring device for a high-viscosity solid-liquid mixture according to claim 7, characterized in that, The hollow stirring shaft (2) is fixedly connected to the high-pressure gas supply device (9) through a connecting ring (10). The connecting ring (10) partially covers the gas inlet (8), and the connecting ring (10) is rotatably and sealed to the hollow stirring shaft (2). The hollow stirring shaft (2) and the connecting ring (10) are connected through a sealed bearing (11).

9. A stirring device for a high-viscosity solid-liquid mixture according to claim 1, characterized in that, The projections of the upper stirring device (4), the middle stirring device (5), and the bottom stirring device (6) on the horizontal plane are staggered.

10. A stirring device for a high-viscosity solid-liquid mixture according to claim 1 or 5, characterized in that, The number of the upper stirring device (4) and / or the bottom stirring device (6) and / or the middle stirring device (5) is even, and they are evenly distributed around the circumference of the hollow stirring shaft.

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