A suspension predispersion system equipped with a multi-stage shear flow channel

Abstract

The application relates to the technical field of mixing equipment, in particular to a suspension pre-dispersion system equipped with a multi-stage shearing flow channel, which comprises an outer cylinder, upper and lower covers coaxially fixedly installed on the upper and lower sides of the outer cylinder, an inner cylinder coaxially fixedly installed in the outer cylinder, a rotating shaft coaxially rotatably installed in the outer cylinder and penetrating through the upper and lower sides, blades coaxially fixedly installed on the rotating shaft, the blades being arranged in the inner cylinder, and the inner cylinder comprising a straight cylinder section and a tapered cylinder section. The powder block of the liquid surface is forced to push downward, the multi-stage shearing flow channel structure is combined, the problem that the powder island floating on the liquid surface is difficult to soak and agglomerate is avoided from the root, the shearing dead zone existing in the traditional pre-dispersion equipment is completely eliminated through multiple shearing and crushing in the circulation process, the pre-dispersion uniformity of the high-concentration and high-viscosity suspension can be effectively improved, the treatment burden of the subsequent refining process can be reduced, and the quality stability of the final product can be improved.

Description

Technical Field

[0001] This invention relates to the field of mixing equipment technology, specifically to a suspension pre-dispersion system equipped with multi-stage shear channels. Background Technology

[0002] In industrial production, the dispersion and homogenization of suspensions are core process steps in chemical, materials, and pharmaceutical fields. This is especially true for complex suspension systems with high concentrations, high viscosity, and non-Newtonian fluid characteristics. The effectiveness of pre-dispersion directly determines the efficiency of subsequent grinding processes and the particle size distribution quality of the final product. Current pre-dispersion equipment mostly employs conventional stator-rotor shearing mechanisms or traditional stirred dispersion tanks, achieving physical dispersion of powder particles in the liquid phase through mechanical energy input.

[0003] However, when processing materials with high viscosity or easy adsorption properties, traditional pre-dispersion equipment often encounters problems. Due to the surface tension and wetting rate limitations at the moment of powder-liquid contact, the powder easily forms localized "powder islands" on the liquid surface after being added to the liquid phase. These powder clumps floating on the liquid surface are difficult to wet and encapsulate in time, leading to uneven material distribution within the chamber, increased mechanical energy consumption, and a tendency for material agglomeration due to insufficient wetting. Furthermore, for some mixed systems containing viscous components, the viscous components easily form a coating layer on the surface of solid particles, further hindering the penetration and diffusion of the fluid medium into the particle interior.

[0004] To address these issues, existing solutions often involve increasing rotor speed, extending cycle time, or employing multi-stage tandem shear pumps. However, simply increasing shear strength leads to a rapid increase in the system's internal energy, which can negatively impact heat-sensitive materials. Furthermore, traditional stator-rotor structures often suffer from insufficient axial driving force, failing to effectively address the forced intake and instantaneous wetting of liquid particles, resulting in significant shear dead zones during the pre-dispersion process. In addition, existing mixing structures lack a physical peeling mechanism for the adhesive film on particle surfaces, leading to low overall dispersion efficiency and failing to meet the stringent requirements of fluid uniformity in modern high-precision machining.

[0005] Therefore, designing a compact suspension pre-dispersion system that can achieve forced wetting of powder and liquid and has composite shearing and scraping functions has become a technical problem that urgently needs to be solved in the field of fluid mixing and dispersion equipment. Summary of the Invention

[0006] The purpose of this invention is to provide a suspension pre-dispersion system equipped with multi-stage shear channels to solve the problems mentioned in the background art, such as the difficulty of quickly completing powder-liquid wetting, the easy formation of powder agglomeration, the lack of effective peeling of the adhesive coating film on the particle surface, and the existence of shear dead zones leading to low dispersion efficiency.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A suspension pre-dispersion system equipped with a multi-stage shear flow channel includes an outer cylinder. An upper cover and a lower cover are coaxially fixedly installed on the upper and lower sides of the outer cylinder, respectively. An inner cylinder is coaxially fixedly installed inside the outer cylinder. A rotating shaft passing through both the upper and lower sides is coaxially rotatably installed inside the outer cylinder. Blades are coaxially fixedly installed on the rotating shaft and are located inside the inner cylinder. The inner cylinder includes a straight section and a conical section, with the conical section positioned above the straight section and its larger end facing upwards. A fixed disk is coaxially fixedly installed at the lower end of the inner cylinder. A shear disk is coaxially rotatably installed at the upper end of the lower cover. The shear disk is fixedly connected to the rotating shaft. A reflux channel is provided between the inner and outer cylinders. When the rotating shaft rotates clockwise, the thrust of the blades is downwards. Multiple annular arrays of shearing teeth are provided on the lower end face of the fixed disk and the upper end face of the shear disk. The gap between the fixed disk and the shearing teeth on the shear disk is B, where 0.5mm ≤ B ≤ 1.5mm.

[0008] By setting a coaxially fixed inner cylinder structure inside the outer cylinder, and cooperating with the blades driven by the rotating shaft and the shearing disc rotating at the bottom, a circulating multi-stage shearing flow channel is formed, from the inner cylinder to the return channel and back to the inner cylinder. When the rotating shaft rotates forward, the blades will continuously apply downward thrust to the internal material, which can force the powder clumps floating on the liquid surface at the top of the inner cylinder to be pushed downward, avoiding the powder from floating on the liquid surface for a long time and forming "powder islands" that are difficult to wet. After the material is pushed to the lower end of the inner cylinder, it will enter the shearing tooth gap between the fixed disc and the shearing disc. The gap is controlled between 0.5 mm and 1.5 mm, which can ensure the shearing force to break up the agglomerated particles, and prevent the material from clogging due to the gap being too small, allowing the highly viscous suspension to flow through stably.

[0009] Furthermore, after the shearing teeth perform the first layer of shearing and crushing on the material, large particle agglomerates are initially broken up. The broken material flows outward along the shearing disc. After the material is sheared at the bottom, it flows out of the shearing disc and enters the return channel between the outer and inner cylinders. The material that has completed shearing is pushed upward to the top of the inner cylinder and re-enters the inner cylinder. Relying on the thrust of the blades, it is sheared downward again. The entire pre-dispersion process relies on the multi-stage shearing channel of the circulating flow to achieve forced wetting, step-by-step shearing and circulating dispersion of the material. This eliminates the shearing dead zone in the pre-dispersion process, effectively improves the pre-dispersion uniformity of high-concentration and high-viscosity suspensions, reduces the processing burden of subsequent fine grinding processes, and improves the quality stability of the final product.

[0010] Preferably, the upper surface of the shearing disc is provided with a first guide groove, a second guide groove, a third guide groove, and a fourth guide groove, respectively. The first guide groove, the second guide groove, the third guide groove, and the fourth guide groove are coaxially and equidistantly arranged from the inside to the outside, and their depths decrease equidistantly. The shearing teeth on the shearing disc include a first tooth, a second tooth, a third tooth, and a fourth tooth. The first tooth is located in the first guide groove, the second tooth is located in the second guide groove, the third tooth is located in the third guide groove, and the fourth tooth is located in the fourth guide groove. The upper ends of the first tooth, the second tooth, the third tooth, and the fourth tooth are in the same plane.

[0011] By setting multiple guide channels with gradually decreasing depth from the inside to the outside on the shearing disc, and placing corresponding shearing teeth inside the guide channels, the cross-section of the flow channel gradually decreases as the material flows from the inside to the outside. The material flow velocity gradually increases as the flow channel becomes shallower, and the corresponding shearing force also increases step by step. This enables step-by-step shearing and crushing from large particle agglomerates to small particle clumps: the material entering the shearing zone contains more large-diameter agglomerates. At this time, the first guide channel is deeper and can accommodate more material. Combined with the relatively larger first tooth, it completes the initial coarse shearing and avoids further material accumulation. Material accumulation and blockage occur at the inlet; as the material flows outward, large agglomerates are sheared into smaller clumps. At this point, the channel depth gradually decreases, the flow velocity increases, and the shearing intensity increases step by step. In conjunction with the second, third, and fourth teeth, the smaller particle agglomerates are finely sheared layer by layer, thus matching the law that the particle size gradually decreases during the material shearing process. This ensures the flow capacity at the inlet and improves the shearing accuracy at the outlet, avoiding energy waste caused by ineffective shearing. At the same time, it allows agglomerates of different sizes to obtain suitable shearing and crushing effects.

[0012] Preferably, the No. 1 guide channel is connected to the No. 2 guide channel, the No. 2 guide channel is connected to the No. 3 guide channel, and the No. 3 guide channel is connected to the No. 4 guide channel through an arc-shaped connecting surface. The rotating shaft is provided with a guide section, the lower end of which is tangent to the bottom surface of the No. 1 guide channel, and the upper end of which is tangent to the outer wall of the rotating shaft.

[0013] By connecting the guide channels of different depths with an arc-shaped connecting surface, sharp corners and dead angles can be avoided between the guide channels, preventing small particles in the material from accumulating and clumping at the corners, ensuring smooth material flow, and reducing material residue from contaminating subsequent batches of production. The guide section set on the rotating shaft can smoothly guide the material flowing downward from the periphery of the rotating shaft into the first guide channel, preventing material from accumulating in the center of the shearing disc, allowing all the material pushed downward to smoothly enter the multi-stage shearing channel to complete the shearing process, further reducing the shearing dead zone in the center, and improving space utilization and shearing efficiency.

[0014] Preferably, the blades on the rotating shaft include a first blade and a second blade, the first blade and the second blade have the same blade inclination direction, the first blade is located in the conical section, and the second blade is located in the straight section.

[0015] By setting blade No. 1 and blade No. 2 at different heights in the inner cylinder section, downward axial thrust can be provided for materials in different areas: Blade No. 2 in the straight cylinder section will directly apply downward pressure to the powder clumps floating on the top liquid surface, overcoming the buoyancy of the powder clumps and forcibly pressing the powder clumps below the liquid surface, allowing the liquid phase to fully contact the powder surface, thus solving the problem of powder forming "powder islands" from the root; while blade No. 1 in the conical cylinder section will further pressurize the mixture that has entered the inner cylinder, ensuring that the material can be continuously and stably transported downward to the shearing zone at the bottom, avoiding material stagnation in the middle of the inner cylinder due to insufficient blade thrust, ensuring the continuity of material flow in the entire circulation channel, and improving the efficiency of circulation shearing.

[0016] Preferably, a reflux blade is coaxially fixedly installed on the outer wall of the shear disc, the tilt direction of the reflux blade is opposite to that of the first blade, and the vertical projection range of the reflux blade is located within the vertical projection range of the reflux channel.

[0017] By setting return blades on the shearing disc, when the shearing disc rotates with the shaft, the return blades, which are tilted in the opposite direction, exert an upward thrust on the material in the return channel, thereby stably conveying the material after bottom shearing upwards. The entire cycle of shearing downwards from the inner cylinder and returning upwards from the return channel can be completed without the need for an additional power conveying device, simplifying the overall structure of the equipment and reducing additional energy consumption. Furthermore, the projection range of the return blades completely covers the return channel, ensuring that all materials in the return channel receive an upward driving force, preventing material from adhering and stagnating on the inner wall of the return channel, ensuring the stability of the circulation flow, and allowing each cycle to carry a sufficient amount of material to complete the shearing process.

[0018] Preferably, the inner wall of the straight section is provided with at least two baffles, and the baffles are evenly distributed around the circumference of the axis of the straight section.

[0019] By setting circumferentially distributed baffles on the inner side of the straight section, the material moving in a circular motion with the rotating shaft can be blocked and disturbed, breaking the stable flow field formed by the material rotating synchronously with the blades. This prevents the material from being unable to be conveyed downwards due to long-term rotation against the wall caused by centrifugal force, and promotes forced collision and mixing of materials at different flow rates and positions. This allows the dry powder clumps that have not yet been fully wetted to come into full contact with the fully wetted liquid phase material, improving the overall wettability of the powder and further reducing the formation of agglomerates.

[0020] Preferably, the sidewall of the deflector has multiple flow holes, which are through holes, and the multiple flow holes on each deflector are equidistant in the vertical direction.

[0021] By opening equidistant flow holes on the baffle plate, the entire baffle plate avoids excessive obstruction of the material's downward flow and prevents the material from accumulating above the baffle plate. At the same time, when the material passes through the flow holes, the flow holes will cut and disperse the original continuous material flow. The small powder clumps that were originally clustered together will be cut and broken by the hole walls of the flow holes, which further improves the pre-dispersion effect in the inner cylinder conveying process. This allows the material to complete the initial wetting and crushing before reaching the bottom shear plate, effectively improving the overall pre-dispersion efficiency.

[0022] Preferably, a sleeve is provided outside the inner cylinder, the upper end of the sleeve is fixedly connected to the straight cylinder section, the inner and outer sides of the fixing disk are fixedly connected to the lower end of the conical cylinder and the lower end of the sleeve, respectively, and the inner side wall of the sleeve, the outer side wall of the conical cylinder section and the upper end face of the fixing disk form a heat dissipation cavity.

[0023] After an additional sleeve is installed on the outside of the inner cylinder to form an independent heat dissipation cavity, a cooling medium can be introduced into the heat dissipation cavity during long-term continuous operation of the equipment. This can promptly remove the excess heat generated by shear friction inside the inner cylinder, preventing the overall temperature of the suspension from rising rapidly. This not only protects heat-sensitive materials from changing their properties due to high temperatures, but also prevents high-viscosity materials from becoming excessively thinner due to temperature increases, ensuring stable transmission of shear force during shearing and maintaining a stable pre-dispersion effect.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention, by forcibly pushing powder clumps downwards from the liquid surface and combining them with a circulating multi-stage shear channel structure, fundamentally avoids the problem of "powder islands" floating on the liquid surface being difficult to wet and clump together. Combined with multiple stages of shearing and crushing during the circulation process, it completely eliminates the shear dead zone present in traditional pre-dispersion equipment, effectively improving the pre-dispersion uniformity of high-concentration, high-viscosity suspensions, reducing the processing burden of subsequent fine grinding processes, and improving the quality stability of the final product.

[0025] 2. This invention sets up multi-stage guide channels with decreasing depth from the inside to the outside on the shearing disc, and arranges corresponding shearing teeth in the guide channels. As the material flows from the inside to the outside, the cross-section of the flow channel gradually decreases, and the flow velocity and shearing intensity increase step by step. This perfectly matches the changing law of the particle size gradually decreasing during the material shearing process. This ensures the flow capacity at the inlet and avoids inlet blockage due to large flow of material, while also improving the shearing accuracy at the outlet and avoiding energy waste caused by ineffective shearing. This allows agglomerated particles of different sizes to obtain suitable shearing and crushing effects.

[0026] 3. This invention, by setting a flow-disrupting rib with flow holes on the inner wall of the straight section, can not only break the stable flow field of the material rotating synchronously with the blades, preventing the material from rotating against the wall and unable to descend, thus promoting full contact between the unwetted powder and the liquid phase and improving the wetting efficiency, but also cut and crush the material flow through the flow holes, allowing the material to complete the initial pre-dispersion before reaching the bottom shearing zone, further improving the overall dispersion efficiency. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the suspension pre-dispersion system equipped with multi-stage shear channels according to the present invention. Figure 2 A cross-sectional view of the suspension pre-dispersion system equipped with multi-stage shear channels according to the present invention; Figure 3 This is a schematic diagram of the structure of the rotating shaft and shear disk of the present invention; Figure 4 for Figure 3 A magnified view of a section at point A in the middle; Figure 5 for Figure 3 Full sectional view at point BB.

[0028] In the diagram: 1. Outer cylinder; 101. Return channel; 2. Upper cover; 3. Lower cover; 4. Inner cylinder; 401. Straight cylinder section; 402. Conical cylinder section; 5. Rotating shaft; 501. Guide section; 6. Fixed plate; 7. Shearing plate; 701. Guide channel 1; 702. Guide channel 2; 703. Guide channel 3; 704. Guide channel 4; 705. Tooth 1; 706. Tooth 2; 707. Tooth 3; 708. Tooth 4; 8. Blade 1; 9. Blade 2; 10. Return blade; 11. Baffle rib; 1101. Flow hole; 12. Sleeve; 1201. Heat dissipation cavity; 13. Powder feed pipe; 14. Liquid feed pipe; 15. Discharge pipe. Detailed Implementation

[0029] Please see Figures 1 to 5 This invention provides a suspension pre-dispersion system equipped with multi-stage shear channels, the technical solution of which is as follows: For an example of a suspension pre-dispersion system equipped with multi-stage shear channels, please refer to [link / reference]. Figures 1 to 5The system includes an outer cylinder 1, with an upper cover 2 and a lower cover 3 coaxially fixedly installed on the upper and lower sides of the outer cylinder 1, respectively. The upper end of the upper cover 2 is provided with a powder feed pipe 13 and a liquid feed pipe 14. The powder feed pipe 13 is connected to the feeding equipment, and the liquid feed pipe 14 is connected to the liquid material supply equipment. The lower end of the lower cover 3 is provided with a discharge pipe 15, which is connected to the grinding equipment of the next process. The powder feed pipe 13, the liquid feed pipe 14, and the discharge pipe 15 are all connected to the outer cylinder 1. An inner cylinder 4 is coaxially fixedly installed inside the outer cylinder 1. A return channel 101 is provided between the inner cylinder 4 and the outer cylinder 1. A rotating shaft 5 that passes through the upper and lower sides is coaxially rotatably installed inside the outer cylinder 1. Blades are coaxially fixedly installed on the rotating shaft 5. When the rotating shaft 5 rotates forward, the thrust of the blades is downward. The blades are located inside the inner cylinder 4. A driving device is provided at the lower end of the lower cover 3. The driving device is used to provide driving force for the rotating shaft 5. The inner cylinder 4 includes a straight section 401 and a conical section 402. The conical section 402 is located above the straight section 401, with its larger end facing upwards. The blades on the rotating shaft 5 include a first blade 8 and a second blade 9. The first blade 8 and the second blade 9 have the same inclination direction. The first blade 8 is located inside the conical section 402, and the second blade 9 is located inside the straight section 401. The inner sidewall of the straight section 401 is provided with at least two flow-deflecting ribs 11. The multiple flow-deflecting ribs 11 are evenly distributed around the circumference of the axis of the straight section 401. Multiple flow-through holes 1101 are opened on the sidewall of the flow-deflecting ribs 11. The flow-through holes 1101 are through holes, and the multiple flow-through holes 1101 on each flow-deflecting rib 11 are equidistant in the vertical direction.

[0030] Furthermore, a fixed plate 6 is coaxially fixedly installed at the lower end of the inner cylinder 4, and a shearing plate 7 is coaxially rotatably installed at the upper end of the lower cover 3. The shearing plate 7 is fixedly connected to the rotating shaft 5. Multiple annular arrays of shearing teeth are provided on the lower end face of the fixed plate 6 and the upper end face of the shearing plate 7. The gap between the shearing teeth on the fixed plate 6 and the shearing plate 7 is B, 0.5mm≤B≤1.5mm. The upper end face of the shearing plate 7 is provided with a first guide groove 701, a second guide groove 702, a third guide groove 703, and a fourth guide groove 704. These four guide grooves are coaxially and equidistantly arranged from the inside out, with their depths decreasing equidistantly. The depth of the first guide groove 701 is 5mm, the depth of the second guide groove 702 is 4mm, the depth of the third guide groove 703 is 3mm, and the depth of the fourth guide groove 704 is... The depth of 01 is 2mm. The shearing teeth on the shearing disc 7 include tooth 1 705, tooth 2 706, tooth 3 707 and tooth 4 708. Tooth 1 705 is located in the first guide groove 701, tooth 2 706 is located in the second guide groove 702, tooth 3 707 is located in the third guide groove 703, and tooth 4 708 is located in the fourth guide groove 704. The upper ends of tooth 1 705, tooth 2 706, tooth 3 707 and tooth 4 708 are in the same plane. The first guide channel 701 and the second guide channel 702, the second guide channel 702 and the third guide channel 703, and the third guide channel 703 and the fourth guide channel 704 are all connected by arc-shaped connecting surfaces. The rotating shaft 5 is provided with a guide section 501. The lower end of the guide section 501 is tangent to the bottom surface of the first guide channel 701, and the upper end of the guide section 501 is tangent to the outer wall of the rotating shaft 5. Furthermore, a return flow blade 10 is coaxially fixedly installed on the outer wall of the shearing disk 7. The inclination direction of the return flow blade 10 is opposite to that of the first blade 8, and the vertical projection range of the return flow blade 10 is located within the vertical projection range of the return flow channel 101. A sleeve 12 is sleeved outside the inner cylinder 4. The upper end of the sleeve 12 is fixedly connected to the straight cylinder section 401. The inner and outer sides of the fixed disk 6 are fixedly connected to the lower end of the conical cylinder and the lower end of the sleeve 12, respectively. The inner side wall of the sleeve 12, the outer side wall of the conical cylinder section 402, and the upper end face of the fixed disk 6 form a heat dissipation cavity 1201.

[0031] Working principle: Please refer to Figures 1 to 5Before starting the work, adjust the gap B between the shearing teeth according to the material characteristics of the suspension to be pre-dispersed. When the overall particles of the suspension being processed are relatively coarse and the concentration is relatively high, the gap can be adjusted to the range of 1.2-1.5mm to ensure that large particles can pass through smoothly and avoid jamming. When the particles of the suspension being processed are relatively fine and the pre-dispersion accuracy requirement is high, the gap can be adjusted to 0.5-0.8mm to improve the crushing effect of a single shearing and reduce the number of cycles. After adjustment, the powder and liquid phase to be pre-dispersed are fed into the inner cylinder 4 through the powder feed pipe 13 and liquid feed pipe 14 respectively according to the ratio. The drive device is started to drive the rotating shaft 5 to rotate in the forward direction. The rotating shaft 5 drives the first blade 8, the second blade 9 and the third blade to rotate synchronously. The second blade 9 first applies a downward axial thrust to the powder clumps floating on the liquid surface in the straight cylinder section 401, overcoming the buoyancy of the powder clumps and forcibly pressing them below the liquid surface. At the same time, the turbulence ribs 11 evenly distributed on the inner wall of the straight cylinder section 401 will block the material rotating synchronously with the blade. The material that was originally moving in a circular motion against the wall is forced to change its flow direction. During the process, not only do materials with different flow velocities collide and mix, allowing the dry powder clumps to fully contact and wet the liquid phase, but the hole wall of the flow hole 1101 will also perform preliminary cutting and breaking of the agglomerated small powder clumps, completing the first stage of pre-dispersion treatment.

[0032] The material entering the cone section 402 is further pressurized and pushed downwards by the first blade 8, continuously and stably conveying the material to the shearing zone at the bottom of the inner cylinder 4. The guide section 501 at the lower end of the rotating shaft 5 smoothly guides the pushed-down material into the first guide channel 701 in the center of the shearing disc 7, preventing the material from accumulating in the center and forming a shearing dead zone. After entering the first guide channel 701, the material, under the centrifugal force generated by the rotation of the shearing disc 7, gradually flows from the inside to the outside along the guide channel. When it first enters the first guide channel 701, the channel depth is greater, which can accommodate a large flow of material containing large-sized agglomerates. With the help of the first tooth 705, it completes the initial coarse shearing, and the large agglomerates are broken into medium-sized lumps, without causing inlet blockage. When the material flows outwards into the second guide channel 702, the channel depth decreases, the flow channel cross-section shrinks, the flow velocity increases, and the shearing intensity increases. The second tooth 706 further shears and breaks the medium-sized lumps into smaller pieces. Agglomeration occurs; then the material sequentially enters the No. 3 guide channel 703 and the No. 4 guide channel 704, where the channel depth continuously decreases, and the flow velocity and shear strength continuously increase. The No. 3 tooth 707 and the No. 4 tooth 708 perform fine shearing on the smaller particle agglomerates layer by layer, which perfectly matches the changing law of the material particles gradually becoming smaller during the shearing process. This avoids ineffective shearing and wastes energy, and ensures that agglomerates of different particle sizes can obtain suitable shearing and crushing effects. The arc-shaped connection surface between different guide channels also avoids sharp corners and dead angles, prevents the accumulation and residue of fine particles, and ensures smooth material flow. After four stages of shearing, the material flows out from the outer edge of the shearing disc 7 and enters the outer return channel 101. The return blades 10 fixed on the outer side of the shearing disc 7 rotate synchronously with the shearing disc 7. Since their tilt direction is opposite to that of the first blade 8, they will exert an upward thrust on the material in the return channel 101, and transport the sheared material back to the top of the inner cylinder 4. The material then re-enters the inner cylinder 4 to start the next round of pre-dispersion cycle. Without the need for additional power devices, the cyclic shearing can be continuously completed, gradually breaking down and dispersing all agglomerated particles, and finally obtaining a uniform pre-dispersion suspension.

[0033] During the long-term continuous operation of the equipment, cooling water or cooling air is continuously introduced into the heat dissipation cavity 1201 formed between the sleeve 12 and the cone section 402 to remove the heat generated by the shear friction of the material inside the inner cylinder 4, thereby preventing the overall temperature of the suspension from rising rapidly. This not only prevents the heat-sensitive material from deteriorating but also maintains the viscosity of the suspension, ensuring the stable transmission of shear force and allowing the entire pre-dispersion process to proceed continuously and stably.

[0034] The specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiments described above. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and ideas of the present invention should still fall within the protection scope of the present invention.

Claims

1. A suspension pre-dispersion system equipped with multi-stage shear channels, comprising an outer cylinder (1), wherein an upper cover (2) and a lower cover (3) are coaxially fixedly installed on the upper and lower sides of the outer cylinder (1), characterized in that, An inner cylinder (4) is coaxially fixedly installed inside the outer cylinder (1). A rotating shaft (5) passing through the upper and lower sides is coaxially rotatably installed inside the outer cylinder (1). A blade is coaxially fixedly installed on the rotating shaft (5). The blade is located inside the inner cylinder (4). The inner cylinder (4) includes a straight section (401) and a conical section (402). The conical section (402) is located above the straight section (401), with the larger end of the conical section (402) facing upwards. A fixed plate (6) is coaxially fixedly installed at the lower end of the inner cylinder (4). The upper end of the lower cover (3) is coaxially mounted with a shearing disk (7). The shearing disk (7) is fixedly connected to the rotating shaft (5). A return channel (101) is provided between the inner cylinder (4) and the outer cylinder (1). When the rotating shaft (5) rotates forward, the thrust of the blades is downward. The lower end face of the fixed disk (6) and the upper end face of the shearing disk (7) are provided with multiple shearing teeth arranged in a ring array. The gap between the shearing teeth on the fixed disk (6) and the shearing disk (7) is B, 0.5mm≤B≤1.5mm.

2. The suspension pre-dispersion system equipped with multi-stage shear channels according to claim 1, characterized in that, The upper surface of the shearing disc (7) is provided with a first guide groove (701), a second guide groove (702), a third guide groove (703), and a fourth guide groove (704). The first guide groove (701), the second guide groove (702), the third guide groove (703), and the fourth guide groove (704) are coaxially and equidistantly arranged from the inside to the outside, and their depths decrease equidistantly. The shearing teeth on the shearing disc (7) include a first tooth (705), a second tooth (706), a third tooth (707), a fourth tooth (708), a fifth tooth (709), a sixth tooth (7000), a seventh ... The first tooth (705) is located in the first guide groove (701), the second tooth (706) is located in the second guide groove (702), the third tooth (707) is located in the third guide groove (703), and the fourth tooth (708) is located in the fourth guide groove (704). The upper ends of the first tooth (705), the second tooth (706), the third tooth (707), and the fourth tooth (708) are in the same plane.

3. A suspension pre-dispersion system equipped with multi-stage shear channels according to claim 2, characterized in that, The first guide channel (701) and the second guide channel (702), the second guide channel (702) and the third guide channel (703), and the third guide channel (703) and the fourth guide channel (704) are all connected by arc-shaped connecting surfaces. The rotating shaft (5) is provided with a guide section (501). The lower end of the guide section (501) is tangent to the bottom surface of the first guide channel (701), and the upper end of the guide section (501) is tangent to the outer wall of the rotating shaft (5).

4. A suspension pre-dispersion system equipped with multi-stage shear channels according to claim 2, characterized in that, The blades on the rotating shaft (5) include a first blade (8) and a second blade (9). The first blade (8) and the second blade (9) have the same blade tilt direction. The first blade (8) is located in the conical section (402), and the second blade (9) is located in the straight section (401).

5. A suspension pre-dispersion system equipped with multi-stage shear channels according to claim 2, characterized in that, A return blade (10) is coaxially fixed on the outer wall of the shear plate (7). The tilting direction of the return blade (10) is opposite to that of the first blade (8). The vertical projection range of the return blade (10) is located within the vertical projection range of the return channel (101).

6. A suspension pre-dispersion system equipped with multi-stage shear channels according to claim 4, characterized in that, The inner wall of the straight section (401) is provided with at least two baffles (11), and the baffles (11) are evenly distributed around the circumference of the axis of the straight section (401).

7. A suspension pre-dispersion system equipped with multi-stage shear channels according to claim 6, characterized in that, The sidewall of the turbulence rib (11) has multiple flow holes (1101), which are through holes. The multiple flow holes (1101) on each turbulence rib (11) are equidistant in the vertical direction.

8. A suspension pre-dispersion system equipped with multi-stage shear channels according to claim 1, characterized in that, The inner cylinder (4) is fitted with a sleeve (12), the upper end of which is fixedly connected to the straight section (401). The inner and outer sides of the fixed disk (6) are fixedly connected to the lower end of the conical cylinder and the lower end of the sleeve (12), respectively. The inner side wall of the sleeve (12), the outer side wall of the conical section (402), and the upper end face of the fixed disk (6) form a heat dissipation cavity (1201).

Images