Air inlet structure of fluidized bed

Abstract

The utility model particularly relates to an air inlet structure of a fluidized bed, which comprises an air inlet chamber, a stock bin and a ventilation system, a rotational flow plate is arranged between the air inlet chamber and the stock bin, the air inlet chamber is cylindrical, a connecting cavity part communicated with the air inlet chamber and the ventilation system is transversely arranged on the side wall of the air inlet chamber, and a joint port is formed at the communication position of the side wall of the air inlet chamber and the connecting cavity part. The air inlet chamber is cylindrical, the inner cavity wall of the air inlet chamber is provided with a first ring face, the connecting opening is connected with a tangential baffle, one end of the tangential baffle in the horizontal direction is connected with one end of the connecting opening, the other end of the tangential baffle in the horizontal direction extends towards the other end of the connecting opening, and a circulation opening allowing media to pass through is formed between the tangential baffle and the other end of the connecting opening. Through the arrangement, the inlet air enters the air inlet chamber from the circulating port along the first ring surface, so that the air inlet direction is changed, the inlet air forms a cyclone state, the defect that air is easily accumulated at a point in a traditional structure is overcome, the air temperature is uniform, materials are rotationally fluidized under the action of cyclone, and the granulation effect of the materials is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of pharmaceutical equipment, in particular to an air inlet structure of a fluidized bed. Background Art

[0002] Fluidized bed is one of the commonly used process equipment in the production of solid preparations in the pharmaceutical industry. It has multiple functions such as mixing, drying, granulation, coating, etc. It is also widely used in the pharmaceutical, chemical, food and other industries. The fluidized bed consists of a top spray system, a bottom spray system, an air handling system, a heating system, a control system, an exhaust and dust removal system, etc. The top spray is for granulation and drying, and the bottom spray is for coating. The above functions are all realized in the same boiling granulator, and users can select the function requirements according to the actual production process.

[0003] Working principle of fluidized bed: After being purified and heated, the air is sucked in from the bottom of the fluidized bed by the induced draft fan and passes through the distribution plate of the silo, so that the powder particles or wet particles of the material are in a boiling fluidized state in the silo; the particles are preheated and mixed to evaporate the water in the particles, and this process is repeated continuously to form ideal and uniform dry particles.

[0004] like Figure 1-2 The figure shows an existing conventional fluidized bed air inlet structure, including an air inlet chamber 1', a silo 2', a ventilation system, and a swirl plate 3' is arranged between the air inlet chamber 1' and the silo 2'. The air inlet chamber 1' has an air inlet 11' connected to the ventilation system. As shown by the arrow in the figure, wind enters the air inlet chamber 1' from the air inlet 11'. Under the action of inertia, the wind will rush to a point far away from the air inlet 11', resulting in more air volume at a position far away from the air inlet 11' in the silo 2' than at a position close to the air inlet 11', and the wind temperature in the silo 2' is uneven, which affects the material granulation effect. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide an air inlet structure for a fluidized bed.

[0006] The technical solution adopted by the utility model is as follows: an air inlet structure of a fluidized bed, comprising an air inlet chamber, a silo, a ventilation system, a swirl plate arranged between the air inlet chamber and the silo, the air inlet chamber being cylindrical, a connecting cavity connecting the air inlet chamber and the ventilation system being arranged transversely on the side wall of the air inlet chamber, a connection port being formed at the connection between the side wall of the air inlet chamber and the connecting cavity,

[0007] The air inlet chamber is cylindrical and its inner cavity wall has a first annular surface. The connecting port is connected to a tangential baffle. One end of the tangential baffle in the horizontal direction is connected to one end of the connecting port, and the other end in the horizontal direction extends to the other end of the connecting port and forms a flow port with the other end of the connecting port for the medium to pass through.

[0008] Preferably, the other end of the tangential baffle in the horizontal direction extends toward the other end of the connecting opening to the central axis of the connecting opening in the horizontal direction or exceeds the central axis of the connecting opening in the horizontal direction.

[0009] Preferably, the upper and lower ends of the tangential baffle are connected to the upper and lower inner walls of the connecting cavity.

[0010] Preferably, the tangential baffle is an arc-shaped plate, and a side thereof close to the inner cavity of the air inlet chamber is an arc-shaped surface, and the arc-shaped surface is connected with the first annular surface to form a second annular surface.

[0011] Preferably, an inner side wall of the connecting cavity and one end of the tangential baffle extending toward the connecting opening in the horizontal direction are connected with a guide inclined plate.

[0012] Preferably, the upper and lower ends of the guide inclined plate are connected to the upper and lower inner walls of the connecting cavity.

[0013] Preferably, the direction in which the other end of the tangential baffle in the horizontal direction extends toward the other end of the connecting opening is the first direction A, and the cyclone formation direction of the cyclone plate is the same as the first direction A.

[0014] Preferably, the swirl plate includes a fixed ring and a plurality of blades, wherein the plurality of blades are radially arranged in the fixed ring, and one end facing outward is fixedly connected to the fixed ring, and the other end facing inward extends to the center of the fixed ring, and the side edges of the plurality of blades are overlapped in sequence to form a fish scale structure, and a gap is provided between any two adjacent blades, and the inward ends of the plurality of blades are all inclined to the same side to form a spiral structure along the first direction A.

[0015] The beneficial effects of the utility model are as follows: in this structure, the incoming air enters the air inlet chamber from the flow port along the first annular surface, which changes the incoming air direction and makes the incoming air form a cyclone state, thereby solving the defect that the wind is easy to accumulate at one point under the traditional structure, and making the wind temperature uniform, so that the material is rotated and fluidized under the action of the cyclone, thereby ensuring the granulation effect of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0017] Figure 1 This is a front view of the air inlet structure of an existing conventional fluidized bed and a schematic diagram of the wind direction;

[0018] Figure 2 It is a top view of the air inlet structure and wind direction of the existing conventional fluidized bed;

[0019] Figure 3 This is a front view of an embodiment of the utility model;

[0020] Figure 4 It is a top view of an embodiment of the utility model;

[0021] Figure 5 This is a schematic diagram of the wind direction in the embodiment of the utility model;

[0022] Figure 6 This is a schematic diagram of wind direction when viewed from above according to an embodiment of the utility model;

[0023] Figure 7 This is a schematic diagram of the top view of the existing conventional swirl plate;

[0024] Figure 8 This is a schematic diagram of the wind direction of an existing conventional swirl plate when viewed from above;

[0025] Fig. 9 This is a schematic top view of the swirl plate of the utility model embodiment;

[0026] Fig.10 This is a schematic diagram of the wind direction of the swirl plate in the embodiment of the utility model when viewed from above;

[0027] In the figure, 1, air inlet chamber; 2, silo; 3, swirl plate; 11, connecting cavity; 12, first annular surface; 13, second annular surface; 31, fixing ring; 32, blade; 41, tangential baffle; 42, guide inclined plate; 111, connecting port; 411, arc surface; 1111, flow port. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0029] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0030] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but not to limit the scope of protection of the present invention.

[0031] like Figures 1 to 6 , Figures 9 and 10As shown in the figure, in an embodiment of the utility model, an air inlet structure of a fluidized bed comprises an air inlet chamber 1, a silo 2, a ventilation system, a swirl plate 3 is arranged between the air inlet chamber 1 and the silo 2, the air inlet chamber 1 is cylindrical, a connecting cavity 11 connecting the air inlet chamber 1 and the ventilation system is transversely arranged on the side wall of the air inlet chamber 1, and a connecting port 111 is formed at the connection between the side wall of the air inlet chamber 1 and the connecting cavity 11.

[0032] The air inlet chamber 1 is cylindrical and its inner wall has a first annular surface 12. The connecting port 111 is connected to a tangential baffle 41. One end of the tangential baffle 41 in the horizontal direction is connected to one end of the connecting port 111, and the other end in the horizontal direction extends to the other end of the connecting port 111 and forms a flow port 1111 with the other end of the connecting port 111 for the medium to pass through.

[0033] Through this arrangement, the incoming air enters the air inlet chamber from the flow port along the first annular surface, changing the incoming air direction and making the incoming air form a cyclone state, thus solving the defect that the wind is easy to accumulate at one point under the traditional structure, making the wind temperature uniform, making the material rotate and fluidize under the action of the cyclone, and ensuring the granulation effect of the material.

[0034] The other end of the tangential baffle 41 in the horizontal direction extends toward the other end of the connecting opening 111 to the central axis of the connecting opening 111 in the horizontal direction or exceeds the central axis of the connecting opening 111 in the horizontal direction.

[0035] Through this arrangement, the dispersion of incoming air is further reduced, so that the incoming air can more easily form a cyclone after entering the air inlet chamber from the flow port along the first annular surface, thereby improving the cyclone formation effect and further ensuring the granulation effect of the material.

[0036] The upper and lower ends of the tangential baffle 41 are connected to the upper and lower inner walls of the connecting cavity 11 .

[0037] This arrangement prevents the incoming air from entering through the gap between the upper and lower ends of the tangential baffle and the connecting cavity, further reducing the incoming air dispersion, improving the cyclone formation effect, and ensuring the granulation effect of the material.

[0038] The tangential baffle 41 is an arc-shaped plate, and one side of the plate close to the inner cavity of the air inlet chamber 1 is an arc-shaped surface 411 . The arc-shaped surface 411 is connected with the first annular surface 12 to form a second annular surface 13 .

[0039] Through this arrangement, the arc surface and the first annular surface form a second annular surface, which expands the annular path for forming the cyclone, reduces the dispersion of the inlet air in the normal direction, and improves the stability of the cyclone.

[0040] The inner side wall of the connecting cavity 11 and one end of the tangential baffle 41 extending toward the connecting opening 111 in the horizontal direction are connected with a guide inclined plate 42 .

[0041] Through this arrangement, the guide inclined plate has a guiding effect on the air intake entering the flow port, thereby avoiding the air intake dispersion caused by the air intake entering between the tangential baffle and the connecting cavity, and further ensuring the granulation effect of the material.

[0042] The upper and lower ends of the guide inclined plate 42 are connected to the upper and lower inner walls of the connecting cavity 11 .

[0043] This arrangement prevents the incoming air from entering through the gaps between the upper and lower ends of the guide inclined plate and the connecting cavity, further reducing the dispersion of the incoming air.

[0044] The direction in which the other end of the tangential baffle 41 in the horizontal direction extends toward the other end of the connecting opening 111 is the first direction A, and the cyclone forming direction of the cyclone plate 3 is the same as the first direction A.

[0045] Through this arrangement, the cyclone formation direction of the air inlet chamber is kept consistent with the cyclone direction of the cyclone plate, reducing the impact of direction changes on the material and ensuring that the material is always swirling and fluidized under the action of the cyclone.

[0046] The swirl plate 3 includes a fixed ring 31 and a plurality of blades 32. The plurality of blades 32 are radially arranged in the fixed ring 31, and one end facing outward is fixedly connected to the fixed ring 31, and one end facing inward extends to the center of the fixed ring 31. The side edges of the plurality of blades 32 are overlapped in sequence to form a fish scale structure, and a gap is provided between any two adjacent blades 32. The inner ends of the plurality of blades 32 are all inclined to the same side to form a spiral structure along the first direction A.

[0047] Among them, the structure of the cyclone plate can refer to a fluidized bed disclosed in application number 202321203453.5. The difference is that, in this embodiment, the blade is arranged to extend inward at one end to the center of the fixed ring, thereby avoiding the occurrence of a cyclone dead zone in the center of the fixed ring and further improving the material granulation effect.

[0048] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. An air inlet structure for a fluidized bed, comprising an air inlet chamber (1), a silo (2), a ventilation system, and a swirl plate (3) disposed between the air inlet chamber (1) and the silo (2), characterized in that: The air inlet chamber (1) is cylindrical, and a connecting cavity (11) is transversely arranged on the side wall of the air inlet chamber (1) for connecting the air inlet chamber (1) with the ventilation system. A connection opening (111) is formed at the connection point between the side wall of the air inlet chamber (1) and the connecting cavity (11). The air inlet chamber (1) is cylindrical and its inner cavity wall has a first annular surface (12); the connecting port (111) is connected to a tangential baffle (41); one end of the tangential baffle (41) in the horizontal direction is connected to one end of the connecting port (111); the other end of the tangential baffle (41) in the horizontal direction extends to the other end of the connecting port (111) and forms a flow port (1111) with the other end of the connecting port (111) for medium to pass through.

2. The air inlet structure of a fluidized bed according to claim 1, characterized in that: The other end of the tangential baffle (41) in the horizontal direction extends toward the other end of the connecting opening (111) to the central axis of the connecting opening (111) in the horizontal direction or exceeds the central axis of the connecting opening (111) in the horizontal direction.

3. The air inlet structure of a fluidized bed according to claim 1, characterized in that: The upper and lower ends of the tangential baffle (41) are connected to the upper and lower inner walls of the connecting cavity (11).

4. The air inlet structure of a fluidized bed according to claim 1, characterized in that: The tangential baffle (41) is an arc-shaped plate, and the side thereof close to the inner cavity of the air inlet chamber (1) is an arc-shaped surface (411), and the arc-shaped surface (411) is connected to the first annular surface (12) to form a second annular surface (13).

5. The air inlet structure of a fluidized bed according to any one of claims 1 to 4, characterized in that: The inner side wall of the connecting cavity (11) and one end of the tangential baffle (41) extending in the horizontal direction toward the connecting opening (111) are connected with a guide inclined plate (42).

6. The air inlet structure of a fluidized bed according to claim 5, characterized in that: The upper and lower ends of the guide inclined plate (42) are connected to the upper and lower inner walls of the connecting cavity (11).

7. An air inlet structure for a fluidized bed according to any one of claims 1 to 4, characterized in that: The direction in which the other end of the tangential baffle (41) in the horizontal direction extends toward the other end of the connecting opening (111) is the first direction (A), and the cyclone forming direction of the cyclone plate (3) is the same as the first direction (A).

8. The air inlet structure of a fluidized bed according to claim 7, characterized in that: The swirl plate (3) comprises a fixed ring (31) and a plurality of blades (32). The plurality of blades (32) are arranged in a radial structure in the fixed ring (31), and one end facing outward is fixedly connected to the fixed ring (31), and one end facing inward extends to the center of the fixed ring (31). The side edges of the plurality of blades (32) are overlapped in sequence to form a fish scale structure, and a gap is provided between any two adjacent blades (32). The inward ends of the plurality of blades (32) are all inclined to the same side to form a spiral structure along a first direction (A).

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