Uniform distribution air inlet structure of fluidized bed

Abstract

The utility model particularly relates to a uniform distribution air inlet structure of a fluidized bed, which comprises an air inlet chamber, a stock bin and a ventilation system communicated with the air inlet chamber, a flow equalizing component is arranged between the air inlet chamber and the stock bin, and the flow equalizing component is provided with a first inlet and a plurality of first outlets which are arranged towards the stock bin and are uniformly distributed; air flow entering the air inlet chamber enters the flow equalizing assembly from the first inlet and flows into the stock bin through the first outlets. Air flow of the air inlet chamber enters the flow equalizing assembly from the first inlet to be converged, then flows out of the flow equalizing assembly through the first outlet and flows to the stock bin, the air temperature can be kept consistent, the material granulation effect is guaranteed, meanwhile, the first outlets which are evenly distributed can guarantee relative and even distribution of air quantity, and the fluidization effect is improved; and the outlet end face of the first outlet is close to the material, so that the lower limit air volume value of the material entering a fluidized state is reduced, and the granulation efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of pharmaceutical equipment technology, specifically to a uniformly distributed air inlet structure for a fluidized bed. Background Technology

[0002] Fluidized bed granulators are one of the most commonly used process equipment in the production of solid dosage forms in the pharmaceutical industry. They offer multiple functions including mixing, drying, granulation, and coating. They are widely used in the pharmaceutical, chemical, and food industries. A fluidized bed granulator consists of a top spray system, a bottom spray system, an air handling system, a heating system, a control system, and an exhaust and dust removal system. The top spray system handles granulation and drying, while the bottom spray system handles coating. All these functions are implemented within the same fluidized bed granulator, allowing users to select the appropriate features based on their specific production process requirements.

[0003] Fluidized bed working principle: After purification and heating, air is drawn in from the bottom of the fluidized bed by an induced draft fan, passes through the distribution plate of the hopper, and causes the material powder particles or wet particles to be in a boiling fluidized state in the hopper; after the particles are preheated and mixed, the moisture in the particles evaporates. This process is repeated continuously to form ideal and uniform dry particles.

[0004] like Figures 1-4 The diagram shows a conventional fluidized bed air inlet structure, including an air inlet chamber 1', a hopper 2', a ventilation system, and a swirl plate 3' between the air inlet chamber 1' and the hopper 2'. The air inlet chamber 1' has an air inlet 11' connected to the ventilation system, as shown by the arrow in the diagram. Air enters the air inlet chamber 1' from the air inlet 11'. Due to inertia, the airflow will rush towards a point away from the air inlet 11', resulting in a greater airflow in the hopper 2' at a position away from the air inlet 11' than at a position closer to the air inlet 11'. This leads to uneven air temperature in the hopper 2', affecting the material granulation effect. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a uniformly distributed air inlet structure for a fluidized bed.

[0006] The technical solution adopted by this utility model is as follows: a fluidized bed uniform air inlet structure, including an air inlet chamber, a silo, and a ventilation system connected to the air inlet chamber. A flow equalization component is provided between the air inlet chamber and the silo. The flow equalization component has a first inlet and several first outlets that are arranged and evenly distributed towards the silo. The airflow entering the air inlet chamber enters the flow equalization component from the first inlet and flows into the silo through each of the first outlets.

[0007] Preferably, the path lengths from the first inlet to each of the first outlets are equal.

[0008] Preferably, the flow equalization component includes a flow-gathering cylinder and a flow-dividing plate connected to the outer periphery of the flow-gathering cylinder. The diameter of the central flow channel of the flow-gathering cylinder decreases from the air inlet chamber to the hopper. Each first outlet is evenly distributed around the flow-dividing plate and is connected to the central flow channel.

[0009] Preferably, the diameter of the outer periphery of the flow-concentrating cylinder decreases from the air inlet chamber to the hopper, the flow-dividing plate has a central conical hole that matches the shape of the outer periphery of the flow-concentrating cylinder and is fitted onto the outer periphery of the flow-concentrating cylinder through the central conical hole, and a support member is connected to the inner periphery of the flow-concentrating cylinder at a position higher than the flow-dividing plate.

[0010] Preferably, the support member has a first connecting hole at the center and a second outlet at the upper end of the flow-gathering cylinder. The two ends of the first connecting hole are respectively connected to the second outlet and the central flow channel of the flow-gathering cylinder.

[0011] Preferably, a horizontal annular groove communicating with the central conical hole is provided around the distribution plate, and the lower end of the first outlet is connected to the upper end of the horizontal annular groove.

[0012] The flow-gathering cylinder is uniformly provided with several second connecting holes that communicate with the central cone hole around its circumference.

[0013] Preferably, the circumferential position of the second connecting hole is located at the center of the circumferential positions of two adjacent first outlets.

[0014] Preferably, a positioning groove is provided at least one position on the inner circumference of the diverter plate, and a positioning protrusion is provided on the outer circumference of the flow-gathering cylinder at a position corresponding to the positioning groove to form a positioning engagement with it.

[0015] Preferably, the air inlet chamber is cylindrical, and a connecting cavity is provided laterally on the side wall of the air inlet chamber to connect the air inlet chamber and the ventilation system. The connection between the side wall of the air inlet chamber and the connecting cavity forms a joint.

[0016] The air inlet chamber is cylindrical and its inner wall has a first annular surface. The connection port is connected to a tangential baffle. One end of the tangential baffle in the horizontal direction is connected to one end of the connection port, and the other end in the horizontal direction extends to the other end of the connection port and forms a flow port through which the medium passes.

[0017] Preferably, the other end of the tangential baffle in the horizontal direction extends toward the other end of the joint to or beyond the central axis in the horizontal direction of the joint.

[0018] The upper and lower ends of the tangential baffle are connected to the upper and lower inner walls of the connecting cavity.

[0019] The beneficial effects of this utility model are as follows: By replacing the traditional swirl plate with a flow equalization component, the airflow in the air inlet chamber enters the flow equalization component from the first inlet and converges, then flows out of the flow equalization component through the first outlet and flows to the hopper. This ensures that the air temperature remains consistent, guaranteeing the granulation effect of the material. At the same time, the evenly distributed first outlets ensure a relatively uniform distribution of air volume, improving the fluidization effect. Furthermore, the outlet end face of the first outlet is close to the material, reducing the lower limit air volume value for the material to enter the fluidized state, thus improving the granulation efficiency. Attached Figure Description

[0020] 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, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0021] Figure 1 This is a front view of the air inlet structure and a schematic diagram of the airflow direction for an existing conventional fluidized bed.

[0022] Figure 2 This is a top view of the air inlet structure and a schematic diagram of the airflow direction of an existing conventional fluidized bed;

[0023] Figure 3 A front view of the swirl plate in an existing conventional fluidized bed;

[0024] Figure 4 A top view of the cyclone plate in an existing conventional fluidized bed;

[0025] Figure 5 This is a partial cross-sectional view of an embodiment of the present utility model;

[0026] Figure 6 This is a partial top sectional view of an embodiment of the present utility model;

[0027] Figure 7 This is a frontal view of the wind direction in an embodiment of the present invention;

[0028] Figure 8 This is a top-view diagram of the wind direction according to an embodiment of the present invention;

[0029] Figure 9 This is a front view of the current sharing component according to an embodiment of the present invention;

[0030] Figure 10 This is a top view of the flow equalization component according to an embodiment of the present invention;

[0031] Figure 11 for Figure 10 Structural cross-sectional view at point AA;

[0032] Figure 12 for Figure 10 Structural cross-sectional view at point BB;

[0033] Figure 13 for Figure 11 Enlarged view of the structure at point C;

[0034] In the diagram, 1 is the air inlet chamber; 2 is the hopper; 3 is the flow-gathering cylinder; 4 is the flow-dividing plate; 11 is the connecting cavity; 12 is the first annular surface; 13 is the second annular surface; 32 is the support component; 33 is the first inlet; 34 is the second outlet; 35 is the second connecting hole; 41 is the central cone hole; 42 is the horizontal annular groove; 43 is the first outlet; 44 is the positioning groove; 51 is the tangential baffle; 111 is the connection port; 321 is the first connecting hole; and 1111 is the flow port. Detailed Implementation

[0035] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0036] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0037] The directional and positional terms used in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0038] like Figures 5 to 13 As shown in the figure, a fluidized bed uniform air inlet structure is provided in an embodiment of the present invention, including an air inlet chamber 1, a hopper 2, and a ventilation system connected to the air inlet chamber 1. A flow equalization component is provided between the air inlet chamber 1 and the hopper 2. The flow equalization component has a first inlet 33 and a plurality of first outlets 43 that are arranged and evenly distributed toward the hopper 2. The airflow entering the air inlet chamber 1 enters the flow equalization component from the first inlet 33 and flows into the hopper 2 through each of the first outlets 43.

[0039] With this setup, the airflow in the air inlet chamber enters the flow equalization component from the first inlet and converges, then flows out of the flow equalization component through the first outlet and flows to the hopper. This ensures that the air temperature remains consistent, guaranteeing the granulation effect of the material. At the same time, the evenly distributed first outlets ensure a relatively uniform distribution of air volume, improving the fluidization effect. Furthermore, the outlet end face of the first outlet is close to the material, reducing the lower limit air volume value for the material to enter the fluidized state, thus improving the granulation efficiency.

[0040] The path lengths from the first inlet 33 to each of the first outlets 43 are equal.

[0041] This setting further improves the uniformity of airflow distribution and enhances the fluidization effect.

[0042] The flow equalization component includes a flow-gathering cylinder 3 and a flow-dividing disk 4 connected to the outer periphery of the flow-gathering cylinder 3. The diameter of the central flow channel 31 of the flow-gathering cylinder 3 decreases from the air inlet chamber 1 to the material bin 2. Each first outlet 43 is evenly distributed around the flow-dividing disk 4 and is connected to the central flow channel 31.

[0043] With this setup, due to the shape and structure of the central flow channel, the airflow automatically converges as it flows from the air inlet chamber through the central flow channel, resulting in a simplified structure and a good convergence effect.

[0044] The diameter of the outer periphery of the flow-gathering cylinder 3 decreases from the air inlet chamber 1 to the hopper 2. The flow-dividing plate 4 has a central cone hole 41 that matches the shape of the outer periphery of the flow-gathering cylinder 3 and is sleeved on the outside of the flow-gathering cylinder 3 through the central cone hole 41. A support member 32 is connected to the inner periphery of the flow-gathering cylinder 3 at a position higher than the flow-dividing plate 4.

[0045] This design improves the ease and stability of installation by fitting the diverter plate onto the concentrator body. After assembly, welding can be used to enhance the stability of the connection between the two. The concentrator body is mounted on the lifting component inside the air inlet chamber via a support.

[0046] The support member 32 has a first connecting hole 321 at the center, and the upper end of the flow-gathering cylinder 3 has a second outlet 34. The two ends of the first connecting hole 321 are respectively connected to the second outlet 34 and the central flow channel 31 of the flow-gathering cylinder 3.

[0047] With this setup, part of the airflow in the central channel will flow from the second outlet through the first connecting hole to the hopper, so that the material in the center of the hopper can also be evenly exposed to airflow, further improving the fluidization effect.

[0048] The distribution plate 4 is provided with a horizontal annular groove 42 that communicates with the central conical hole 41, and the lower end of the first outlet 43 is connected to the upper end of the horizontal annular groove 42.

[0049] The flow-gathering cylinder 3 is uniformly provided with several second connecting holes 35 that communicate with the central cone hole 41.

[0050] This setup results in a simple overall structure and good uniformity of airflow distribution.

[0051] The circumferential position of the second connecting hole 35 is located at the center of the circumferential positions of the two adjacent first outlets 43.

[0052] With this setup, the airflow flows into the horizontal annular groove from the second connecting hole and then undergoes a dispersion path before entering the hopper through the first outlet, further improving the consistency of air temperature.

[0053] At least one position on the inner circumference of the diverter plate 4 is provided with a positioning groove 44, and a positioning protrusion 36 is provided on the outer circumference of the flow-gathering cylinder 3 at a position corresponding to the positioning groove 44 to form a positioning engagement with it.

[0054] This setting improves the accuracy of the position of the distributor plate connected to the concentrator body.

[0055] The air inlet chamber 1 is cylindrical, and a connecting cavity 11 is provided laterally on the side wall of the air inlet chamber 1 to connect the air inlet chamber 1 and the ventilation system. The connection between the side wall of the air inlet chamber 1 and the connecting cavity 11 forms a connection port 111.

[0056] The air inlet chamber 1 is cylindrical and its inner cavity wall has a first annular surface 12. The connection port 111 is connected to a tangential baffle 51. One end of the tangential baffle 51 in the horizontal direction is connected to one end of the connection port 111, and the other end in the horizontal direction extends to the other end of the connection port 111 and forms a flow port 1111 between the other end of the connection port 111 and the other end of the connection port 111, allowing the medium to pass through.

[0057] With this setting, the air enters the air inlet chamber from the flow port along the first annular surface, changing the air inlet direction and making the air inlet form a cyclone state. This extends the running path of the fluid before entering the flow equalization component, while also uniformizing the air temperature, further enhancing the granulation effect of the final material.

[0058] The other end of the tangential baffle 51 in the horizontal direction extends to the other end of the connection port 111 to the central axis in the horizontal direction of the connection port 111 or beyond the central axis in the horizontal direction of the connection port 111. The upper and lower ends of the tangential baffle 51 are connected to the upper and lower inner walls of the connecting cavity 11.

[0059] This design further reduces airflow dispersion, making it easier for the airflow to form a cyclone after entering the air inlet chamber along the first annular surface from the flow port. It prevents the airflow from entering through the gap between the upper and lower ends of the tangential baffle and the connecting cavity, thus improving the cyclone formation effect and further ensuring the granulation effect of the material.

[0060] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A uniform air distribution structure of a fluidized bed, comprising an air inlet chamber (1), a material bin (2), and a ventilation system communicating with the air inlet chamber (1), characterized in that: The air inlet chamber (1) and the stock bin (2) are provided with a flow equalizing assembly, which has a first inlet (33) and a plurality of first outlets (43) arranged towards the stock bin (2) and uniformly distributed, the airflow entering the air inlet chamber (1) enters the flow equalizing assembly from the first inlet (33) and flows into the stock bin (2) through each first outlet (43).

2. The uniform air distribution structure of a fluidized bed according to claim 1, wherein: The path length from the first inlet (33) to each first outlet (43) is equal.

3. The uniform air distribution structure of a fluidized bed according to claim 1, wherein: The flow equalizing assembly comprises a flow converging cylinder body (3) and a flow distribution disc (4) connected to the outer periphery of the flow converging cylinder body (3), the central flow passage (31) of the flow converging cylinder body (3) has a decreasing hole diameter from the air inlet chamber (1) to the stock bin (2), and each first outlet (43) is uniformly arranged on the flow distribution disc (4) and communicates with the central flow passage (31).

4. The uniform air distribution structure of a fluidized bed according to claim 3, wherein: The outer periphery of the flow converging cylinder body (3) has a decreasing diameter from the air inlet chamber (1) to the stock bin (2), the flow distribution disc (4) has a central tapered hole (41) matched with the shape of the outer periphery of the flow converging cylinder body (3) and is sleeved on the outer periphery of the flow converging cylinder body (3) through the central tapered hole (41), and the inner periphery of the flow converging cylinder body (3) is connected with a support (32) at a position higher than the flow distribution disc (4).

5. The uniform air distribution structure of a fluidized bed according to claim 4, wherein: The support (32) has a first communication hole (321) in the center, and the upper end of the flow converging cylinder body (3) has a second outlet (34), and the first communication hole (321) communicates with the second outlet (34) and the central flow passage (31) of the flow converging cylinder body (3) at both ends, respectively.

6. The uniform air distribution structure of a fluidized bed according to claim 4, wherein: The flow distribution disc (4) is provided with a horizontal ring groove (42) surrounding the central tapered hole (41) and communicating with the central tapered hole (41), and the lower end of the first outlet (43) communicates with the upper end of the horizontal ring groove (42), The flow converging cylinder body (3) is uniformly provided with a plurality of second communication holes (35) communicating with the central tapered hole (41) around the circumference.

7. The uniform air distribution structure of a fluidized bed according to claim 6, characterized in that: The circumferential position of the second communication hole (35) is located at the center of the circumferential positions of two adjacent first outlets (43).

8. The uniform air distribution structure of a fluidized bed according to claim 4, wherein: The inner periphery of the flow distribution disc (4) is provided with a positioning groove (44) at at least one position, and the outer periphery of the flow converging cylinder body (3) is provided with a positioning protrusion (36) corresponding to the position of the positioning groove (44) and forming a positioning fit with the positioning groove (44).

9. The uniform air distribution structure of a fluidized bed according to any one of claims 1-8, characterized in that: The air inlet chamber (1) is in the shape of a cylinder, and the lateral wall of the air inlet chamber (1) is transversely provided with a connecting cavity (11) communicating the air inlet chamber (1) with a ventilation system, and the communication part of the lateral wall of the air inlet chamber (1) and the connecting cavity (11) forms a connection interface (111), The air inlet chamber (1) is in the shape of a cylinder and has a first annular surface (12) on the inner cavity wall, the connection interface (111) is connected with a tangential baffle (51), one end of the tangential baffle (51) in the horizontal direction is connected with one end of the connection interface (111), the other end of the tangential baffle (51) in the horizontal direction extends to the other end of the connection interface (111) and forms a flow passage (1111) between the other end of the tangential baffle (51) and the other end of the connection interface (111) for the medium to pass through.

10. The uniform air distribution structure of a fluidized bed according to claim 9, wherein: The other end of the tangential baffle (51) in the horizontal direction extends to the other end of the connection port (111) to the central axis in the horizontal direction of the connection port (111) or beyond the central axis in the horizontal direction of the connection port (111), and the upper and lower ends of the tangential baffle (51) are connected with the upper and lower inner walls of the connection cavity (11).

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