Fluidized bed and fluidized coating apparatus

Abstract

The utility model discloses a kind of fluidization disc and fluidization coating device, shape is conical, inside is equipped with cavity, including side wall and bottom wall, multiple first air passage, second air passage and third air passage are equipped on the side wall and the cavity is communicated, the first air passage, the second air passage and the third air passage are all around the center array distribution of fluidization disc, it is also equipped with the air inlet being communicated with the cavity;The first air passage is vertical through-hole, it is set adjacent to the center of fluidization disc, the third air passage is inclined through-hole towards the center axis of fluidization disc, the third air passage is set adjacent to the edge of fluidization disc, the second air passage is through slot, located between the first air passage and the third air passage, the second air passage is relatively inclined to set the radial of fluidization disc. It can be uniformly fluidized to powder, realize uniform coating, improve product quality.

Description

Technical Field

[0001] This utility model relates to the field of powder material processing technology, and in particular to a fluidizing disc and a fluidizing coating device. Background Technology

[0002] In industries such as pharmaceuticals, chemicals, energy, and food, fluidized bed treatment and coating of powders are key processes to ensure product performance and quality. Fluidized bed treatment aims to create a uniform material environment for coating by using airflow to suspend and loosely fluidize powder particles. Coating, on the other hand, involves forming one or more functional coatings on the surface of the fluidized powder particles to improve powder flowability, stability, solubility, or to impart specific functional goals such as slow release, light protection, and moisture resistance.

[0003] However, the current method of fluidizing powder is still not uniform enough, and it is easy to agglomerate or unevenly distribute the powder, making it difficult to achieve uniform coating of powder particles during the coating process, resulting in inconsistent product quality. Utility Model Content

[0004] The purpose of this invention is to provide a fluidizing disc and a fluidizing coating device that can uniformly fluidize powder, achieve uniform coating, and improve product quality.

[0005] The technical solutions for achieving the above objectives include the following:

[0006] This utility model proposes a fluidizing disk, which is conical in shape and has an internal cavity, including a side wall and a bottom wall. The side wall is provided with a plurality of first air passages, second air passages and third air passages that communicate with the cavity. The first air passages, second air passages and third air passages are all arranged in an array around the center of the fluidizing disk. An air inlet that communicates with the cavity is also provided.

[0007] The first air passage is a vertical through hole, located near the center of the fluidizing plate. The third air passage is a through hole inclined toward the central axis of the fluidizing plate, located near the edge of the fluidizing plate. The second air passage is a through groove, located between the first air passage and the third air passage, and is radially inclined relative to the fluidizing plate.

[0008] In one embodiment, all first airways and all third airways are arranged in a ring around the center of the fluidizing disk, and all second airways are arranged radially around the center of the fluidizing disk.

[0009] In one embodiment, the angle between the centerline of the second airway and the radial line passing through the center point of the second airway is 30-60 degrees on a horizontal projection.

[0010] In one embodiment, the second airway is rectangular or waist-shaped.

[0011] In one embodiment, the angle between the axis of the third airway and the axis of the fluidizing disc is 45 degrees.

[0012] In one embodiment, the bottom wall is provided with a plurality of fourth air passages, which are through holes, and all the fourth air passages are arranged in a ring around the edge of the fluidizing plate.

[0013] In one embodiment, the fourth air passage is a vertical through-hole or a through-hole that slopes downward toward the edge of the fluidizing plate.

[0014] In one embodiment, the center of the fluidizing disc is further provided with a shaft hole extending from the bottom of the fluidizing disc to the top of the fluidizing disc, and the air inlet is provided on the wall of the shaft hole.

[0015] In one embodiment, the fluidizing disk is shaped like a truncated cone, and the shaft hole extends from the bottom end of the fluidizing disk to the top end of the fluidizing disk.

[0016] This utility model also proposes a fluidized bed coating device, comprising: a tank, an air inlet pipe, an atomizing nozzle, and a driving device. The atomizing nozzle is disposed in the tank, and any of the above-mentioned fluidizing discs are installed at the bottom of the tank. The air inlet pipe is connected to the air inlet of the fluidizing disc, and the driving device is used to rotate the fluidizing disc.

[0017] The technical solution provided by this utility model has the following advantages and effects:

[0018] By setting vertical through holes on the side wall as the first air channel, a vertical fluidized airflow is formed. By setting through holes inclined towards the central axis of the fluidizing disk as the third air channel, an inclined fluidized airflow is formed. By setting inclined through grooves as the second air channel, a vortex airflow is formed. By fluidizing the material with airflow in different directions, the powder can be fluidized uniformly, achieving uniform coating and improving product quality. Attached Figure Description

[0019] The accompanying drawings illustrate specific examples of the technical solutions described in this utility model, and together with the detailed embodiments, form part of the specification, serving to explain the technical solutions, principles, and effects of this utility model.

[0020] Unless otherwise specified or defined, the same reference numerals in different figures represent the same or similar technical features, and different reference numerals may be used to represent the same or similar technical features.

[0021] Figure 1 This is a schematic diagram of an embodiment of the powder processing production line of this utility model;

[0022] Figure 2 This is a cross-sectional view of an embodiment of the fluidized coating device of this utility model;

[0023] Figure 3 for Figure 2 Enlarged view of region A in the middle;

[0024] Figure 4 This is a perspective view of an embodiment of the fluidizing disc of this utility model;

[0025] Figure 5 This is a top view of an embodiment of the fluidizing disc of this utility model;

[0026] Figure 6 This is a bottom view of an embodiment of the fluidizing disc of this utility model;

[0027] Figure 7 This is a schematic diagram of the airflow direction in an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100. Fluidized coating device

[0030] 110. Tank body; 120. Air inlet pipe; 130. Drive unit; 131. Fluidization servo motor.

[0031] 140. Fluidizing plate; 141. Cavity; 142. Side wall; 143. Bottom wall; 144. First air passage; 145. Second air passage; 146. Third air passage; 147. Shaft hole; 148. Air inlet; 149. Fourth air passage.

[0032] 150. Dust removal assembly; 160. Atomizing nozzle; 170. Rotary shaft; 171. Airflow channel; 180. Discharge cylinder; 190. Fan.

[0033] 200. Drying device; 300. Coating frame; 400. Drying frame; 500. Discharge pipe; 600. Vertical fluidizing airflow; 700. Inclined fluidizing airflow; 800. Vortex airflow; 900. Anti-adhesion airflow. Detailed Implementation

[0034] To facilitate understanding of this utility model, specific embodiments of this utility model will be described in more detail below with reference to the accompanying drawings.

[0035] Unless otherwise specified or defined, the terms "first," "second," etc., used in this document are for distinguishing names only and do not represent a specific number or order.

[0036] Unless otherwise stated or defined, the term “and / or” as used herein includes any and all combinations of one or more of the related listed items.

[0037] It should be noted that when a component is considered "fixed" to another component, it can be directly fixed to the other component or there can be an intervening component; when a component is considered "connected" to another component, it can be directly connected to the other component or there can be an intervening component; when a component is considered "mounted" on another component, it can be directly mounted on the other component or there can be an intervening component; when a component is considered "placed" on another component, it can be directly placed on the other component or there can be an intervening component.

[0038] This embodiment provides a fluidizing disk, used in applications such as... Figure 1 The production line shown is used for fluidizing, coating, and drying powdered materials. The production line mainly includes a fluidizing and coating device 100 and a drying device 200. The fluidizing and coating device 100 is used to fluidize and coat the powdered materials and is mounted on a coating frame 300. The drying device 200 is used to dry the coated material and is mounted on a drying frame 400. The fluidizing and coating device 100 and the drying device 200 are connected by a discharge pipe 500.

[0039] Fluidized coating device 100 Figure 2 As shown, the system mainly includes a tank 110, an air inlet pipe 120, and a drive unit 130. A fluidizing plate 140 is installed at the bottom of the tank 110, and there is a gap between the fluidizing plate 140 and the bottom wall of the tank 110. A dust removal assembly 150 and an atomizing nozzle 160 are installed inside the tank 110. The air inlet pipe 120 is connected to the air inlet of the fluidizing plate 140. High-pressure gas is introduced into the fluidizing plate 140 through the air inlet and then ejected from the air channels distributed on the surface of the fluidizing plate 140. The ejected airflow suspends the powder, realizing the fluidization and coating of the powder material. The drive unit 130 includes a fluidization servo motor 131 mounted on the coating frame 300 and a belt drive mechanism. The fluidization servo motor 131 drives the fluidizing plate 140 to rotate through the belt drive mechanism.

[0040] In order to achieve uniform fluidization and coating of powder, this embodiment has made an innovative design to the air channel of fluidizing disk 140, which can form vortex airflow, vertical fluidizing airflow and inclined fluidizing airflow. The powder is suspended by these three airflows, thereby achieving uniform fluidization and coating of powder.

[0041] 140 fluidized bed Figures 3-6As shown, the fluidizing plate has a truncated cone shape. It contains a cavity 141 for high-pressure gas flow. This cavity includes side walls 142 and a bottom wall 143. The side walls 142 have multiple first air passages 144, second air passages 145, and third air passages 146, all of which communicate with the cavity 141. A shaft hole 147 is located at the center of the fluidizing plate 140, extending from its bottom to its top. An air inlet 148 is located on the wall of the shaft hole; the shape of the air inlet 148 is not limited. A rotating shaft 170 passes through the shaft hole 147, supporting the fluidizing plate 140 and driving its rotation. The rotating shaft 170 is provided with an airflow channel 171, and the air inlet pipe 120 is fixed at the inlet of the airflow channel 171. The outlet of the airflow channel 171 corresponds to the air inlet 148 on the shaft hole wall. When high-pressure gas is introduced into the fluidizing plate 140, the high-pressure gas enters the cavity from the air inlet 148 and then is ejected from the first air passage 144, the second air passage 145 and the third air passage 146 respectively.

[0042] In some embodiments, the shaft hole 147 extends from the bottom of the fluidizing disk 140 to the top of the fluidizing disk 140, but does not penetrate the top of the fluidizing disk 140. In this case, the fluidizing disk 140 has a complete conical shape. The shape of the fluidizing disk 140 is preferably, but not limited to, a conical shape, and can also be designed as other conical shapes as needed.

[0043] In some embodiments, the fluidizing plate 140 does not have a shaft hole 147, and the rotating shaft 170 passes directly through the cavity 141 and is fixedly connected to the top and bottom of the fluidizing plate 140 respectively. In this case, the through hole in the center of the bottom wall 143 is the air inlet 148.

[0044] All the first air passages 144, second air passages 145, and third air passages 146 are arranged in an array around the center of the fluidizing plate 140. Specifically, the first air passages 144 are vertical through holes, located near the center of the fluidizing plate 140, and are arranged in a ring around the center of the fluidizing plate 140. The gas ejected from all the first air passages 144 forms... Figure 7 The vertical fluidizing airflow 600 fluidizes the powder at the center of the fluidizing disk 140, causing it to suspend and tumble. The third air passage 146 is a through-hole inclined towards the central axis of the fluidizing disk 140. The third air passage 146 is located near the edge of the fluidizing disk 140 and is distributed in a ring around the center of the fluidizing disk 140. The gas ejected from all the third air passages 146 forms... Figure 7The inclined fluidizing airflow 700 is used. Preferably, the angle between the axis of the third air passage 146 and the axis of the fluidizing disk 140 is 45 degrees. This design allows the centrifugally displaced powder to adjust its direction when the fluidizing disk 140 rotates, moving it towards the center of the fluidizing disk 140 for sufficient fluidization and avoiding dead zones. The second air passage 145 is a long, narrow channel located between the first air passage 144 and the third air passage 146. All second air passages 145 are radially distributed around the center of the fluidizing disk 140. The second air passages 145 are radially inclined relative to the fluidizing disk 140, meaning that on the horizontal projection plane, there is a certain angle between the centerline of the second air passage 145 and the radial line passing through the center point of the second air passage 145. This inclined arrangement allows the gas ejected from all the second air passages 145 to form a... Figure 5 The vortex airflow 800 in the middle can drive the powder to form a vortex, causing the powder to tumble evenly. Preferably, on the horizontal plane projection, the angle θ between the center line of the second air passage 145 and the radial line passing through the center point of the second air passage 145 is 30-60 degrees. The angle within this range is designed according to the specific gravity of the material; the higher the specific gravity of the material, the larger the angle. In this embodiment, the specific gravity of the material is 1 kg / L, and the angle is 45 degrees. The specific shape of the second air passage 145 is not limited, but it is preferably rectangular or oblong, which better forms the vortex airflow 800.

[0045] like Figure 6 As shown, this embodiment also provides a plurality of fourth air passages 149 on the bottom wall 143. The fourth air passages 149 are through holes, and all the fourth air passages 149 are arranged in a ring around the edge of the fluidizing plate 140. The gas ejected from all the fourth air passages 149 forms Figure 4 The anti-adhesion airflow 900 is used in the process. Specifically, the gas ejected from the fourth air channel 149 is blown out through the bottom of the fluidizing plate 140, hits the bottom of the tank 110, and then reflects off along the cylinder wall, forming a circumferential air wall at the cylinder wall to prevent powder from adhering to the cylinder wall. It can also fluidize the material centrifuged out when the fluidizing plate 140 rotates. The fourth air channel 149 can be a vertical through hole or a through hole sloping downwards towards the edge of the fluidizing plate 140. By designing the fourth air channel 149, better all-round fluidization without dead angles can be achieved, resulting in better coating performance and no material accumulation.

[0046] The fluidized coating process in this embodiment is as follows:

[0047] The fluidization servo motor 131 is set to a speed of 600 rpm (the higher the specific gravity of the material, the higher the speed). Compressed air enters the fluidization plate 140 through the air inlet pipe 120. The compressed air is divided into four different airflows (vertical fluidization airflow 600, inclined fluidization airflow 700, vortex airflow 800, and anti-adhesion airflow 900) to fluidize the powder. After 3 minutes of fluidization, the atomizing nozzle 160 is opened for coating. The coating liquid is generally about 5-10% of the powder, and the coating time is 10 minutes. After coating is completed, the speed of the fluidization servo motor 131 is adjusted to 5 RPM, and the discharge cylinder 180 and the blower 190 are opened to start discharging the material to the drying device 200.

[0048] In summary, this embodiment fluidizes materials by setting vertical through holes in the sidewall as the first air channel to form a vertical fluidizing airflow, setting through holes inclined towards the central axis of the fluidizing disk as the third air channel to form an inclined fluidizing airflow, setting inclined through grooves as the second air channel to form a vortex airflow, and setting through holes in the bottom wall as the fourth air channel to form an anti-adhesion airflow. By fluidizing materials through four different airflows, not only can uniform fluidization and coating be achieved, but also all-round fluidization without dead corners can be realized, and material accumulation is prevented.

[0049] When referencing drawings, new features are explained. To avoid redundant references to drawings that would make the description less concise, features already described will not be referenced again on the drawings if the description is clear.

[0050] The purpose of the above embodiments is to reproduce and derive the technical solution of this utility model by way of example, and to fully describe the technical solution, purpose and effect of this utility model. The purpose is to enable the public to have a more thorough and comprehensive understanding of the disclosed content of this utility model, and it is not intended to limit the protection scope of this utility model.

[0051] The above embodiments are not an exhaustive list based on the present invention, and there may be other embodiments not listed. Any substitutions and improvements made without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. Fluidized bed characterized in that It is cone-shaped and has an internal cavity, including side walls and a bottom wall. The side walls are provided with a plurality of first air passages, second air passages and third air passages that communicate with the cavity. The first air passages, second air passages and third air passages are all arranged in an array around the center of the fluidizing plate. It is also provided with an air inlet that communicates with the cavity. The first air passage is a vertical through hole, located near the center of the fluidizing plate. The third air passage is a through hole inclined toward the central axis of the fluidizing plate, located near the edge of the fluidizing plate. The second air passage is a through groove, located between the first air passage and the third air passage, and is radially inclined relative to the fluidizing plate.

2. The fluidized bed as claimed in claim 1, wherein All first and third airways are arranged in a ring around the center of the fluidization disk, while all second airways are arranged radially around the center of the fluidization disk.

3. The fluidizing disk as described in claim 1, characterized in that, On a horizontal plane projection, the angle between the centerline of the second airway and the radial line passing through the center point of the second airway is 30-60 degrees.

4. The fluidizing disk as described in claim 3, characterized in that, The second airway is rectangular or waist-shaped.

5. The fluidized bed of claim 1 wherein, The angle between the axis of the third airway and the axis of the fluidizing plate is 45 degrees.

6. Fluidized bed as claimed in any of the claims 1-5, characterized in that The bottom wall is provided with multiple fourth air channels, which are through holes, and all the fourth air channels are arranged in a ring around the edge of the fluidizing plate.

7. The fluidizing disk as described in claim 6, characterized in that, The fourth air passage is either a vertical through-hole or a through-hole that slopes downward toward the edge of the fluidizing plate.

8. The fluidizing disk as described in claim 6, characterized in that, The fluidizing pan also has a shaft hole extending from the bottom to the top of the fluidizing pan at its center, and the air inlet is provided on the wall of the shaft hole.

9. The fluidizing disk as described in claim 8, characterized in that, The fluidizing disk is shaped like a truncated cone, and the shaft hole extends from the bottom end of the fluidizing disk to the top end.

10. A fluidized bed coating apparatus, characterized in that, include: The device comprises a tank, an air inlet pipe, an atomizing nozzle, and a driving device. The atomizing nozzle is disposed in the tank. A fluidizing disc as described in any one of claims 1-9 is installed at the bottom of the tank. The air inlet pipe is connected to the air inlet of the fluidizing disc. The driving device is used to rotate the fluidizing disc.

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