Boiling dryer for pharmaceutical raw materials

Abstract

The boiling dryer comprises a tank body, an air heater, a pre-drying cylinder and a hopper, when the boiling dryer works, the air heater supplies air to the bottom of the tank body, the pharmaceutical raw materials are in full contact with the hot air to form a boiling state, the pharmaceutical raw materials can be dried after a period of time, and in the drying process, the pre-drying cylinder is arranged in the pre-drying cylinder. Hot air with water vapor is discharged from the first exhaust port, dried by the first dryer and then enters the pre-drying cylinder from the hot air inlet, pharmaceutical raw materials in the hopper enter the inclined screen plates from the top inlet of the pre-drying cylinder, and the pharmaceutical raw materials are conveyed through the multiple inclined screen plates. The air is pre-dried by the hot air with residual heat in the pre-drying cylinder, the pre-drying effect can be effectively improved, and finally, the hot air with part of heat is dried by the second dryer from the second exhaust port and then is used as an air source of the air heater, so that the temperature of the air required to be raised by the air heater is reduced; and residual heat attached to hot air is fully utilized.

Description

Technical Field

[0001] The utility model belongs to the technical field of pharmaceutical processing equipment and relates to a fluidized bed dryer for pharmaceutical raw materials. Background Art

[0002] In the pharmaceutical field, a fluidized bed dryer is usually used to quickly dry pharmaceutical raw materials. The fluidized bed dryer forms hot air after heating the air through a heat exchanger, and the hot air enters the main machine through valve plate distribution. The wet pharmaceutical raw materials enter the dryer from the feeder. Due to the action of wind pressure, the pharmaceutical raw materials form a fluidized state in the dryer and come into extensive contact with the hot air, thus completing the drying of the materials in a relatively short time.

[0003] Chinese Utility Model Patent CN209027191U discloses a fluidized bed dryer, which pre-dries pharmaceutical raw materials by using the residual heat carried by the hot air and can effectively utilize the heat of the hot air. However, its pre-drying effect on the pharmaceutical raw materials in the buffer tank is limited, and the residual heat in the hot air is still not fully utilized. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a fluidized bed dryer for pharmaceutical raw materials, which can fully utilize the residual heat carried by the hot air and improve the pre-drying effect.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] A fluidized bed dryer for pharmaceutical raw materials includes a tank body, a hot air blower, a pre-drying cylinder and a hopper. The upper part of the tank body is provided with a first exhaust port and the top is provided with a feeding port. The hot air blower is communicated with the bottom of the tank body and is suitable for providing hot air. The bottom outlet of the pre-drying cylinder is connected to the feeding port. The lower side wall of the pre-drying cylinder is provided with a hot air inlet, and the hot air inlet is communicated with the first exhaust port and a first dryer is arranged between them. A plurality of inclined mesh plates are arranged in a staggered up-and-down manner above the hot air inlet. The inclined mesh plate located above guides the materials onto the adjacent inclined mesh plate below. Above the uppermost inclined mesh plate, the side wall of the pre-drying cylinder is provided with a second exhaust port, and the second exhaust port is communicated with the air inlet of the hot air blower and a second dryer is arranged between them. A filter screen is arranged at the second exhaust port, and the hopper is connected to the top inlet of the pre-drying cylinder.

[0007] Further, the inclined mesh plate is connected with a vibration motor.

[0008] Further, the inclination angle of the inclined mesh plate with respect to the horizontal direction is 15 - 25 degrees.

[0009] Further, a plurality of mesh holes are provided on the inclined mesh plates, and the inclined mesh plates located above have larger mesh holes than the adjacent inclined mesh plates below.

[0010] Further, a valve is provided at the bottom of the hopper.

[0011] Further, a temperature and humidity sensor is provided on the pipeline behind both the first dryer and the second dryer after the drying treatment.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] The fluidized bed dryer of the present utility model includes a tank body, a hot air blower, a pre-drying cylinder and a hopper. During operation, the hot air blower supplies air to the bottom of the tank body, and the pharmaceutical raw materials are in full contact with the hot air to form a fluidized state. After a period of time, the drying of the pharmaceutical raw materials can be achieved. During the drying process, the hot air with water vapor is discharged from the first exhaust port. After being dried by the first dryer, it enters the pre-drying cylinder from the hot air inlet. The pharmaceutical raw materials in the hopper enter the inclined mesh plates from the top inlet of the pre-drying cylinder. During the transmission process of the pharmaceutical raw materials on the multiple inclined mesh plates, they are pre-dried by the hot air with residual heat in the pre-drying cylinder, which can effectively improve the pre-drying effect. Finally, the hot air with some heat passes through the second dryer after passing through the second exhaust port and is used as the air source of the hot air blower, reducing the temperature that the hot air blower needs to raise for the air, and realizing the full utilization of the residual heat carried by the hot air. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings, where:

[0015] Figure 1 It is a schematic structural diagram of a fluidized bed dryer for pharmaceutical raw materials according to an embodiment of the present utility model.

[0016] Markings in the figure:

[0017] 10 - Tank body; 11 - First exhaust port; 12 - Feeding port;

[0018] 20 - Hot air blower;

[0019] 30 - Pre-drying cylinder; 31 - Hot air inlet; 32 - First dryer; 33 - Second exhaust port; 34 - Filter screen; 35 - Second dryer; 36 - Vibration motor;

[0020] 40 - Hopper; 41 - Valve. Detailed implementation manners

[0021] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model, rather than to limit the present utility model. That is, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Generally, the components of the embodiments of the present utility model described and shown in the accompanying drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but only represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present utility model.

[0023] It should be noted that relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device including the said element.

[0024] As described in the background art, Chinese utility model patent CN209027191U discloses a fluidized bed dryer, which pre-dries pharmaceutical raw materials by using the residual heat carried by hot air, and can effectively utilize the heat of the hot air. However, its pre-drying effect on the pharmaceutical raw materials in the buffer tank is limited, and the residual heat in the hot air is still not fully utilized.

[0025] Based on this, the inventor created a fluidized bed dryer for pharmaceutical raw materials in this application to solve the above technical problems.

[0026] The features and performance of the present utility model will be further described in detail below with reference to the embodiments.

[0027] Please refer to Figure 1, A fluidized bed dryer for pharmaceutical raw materials, comprising a tank body 10, a hot air blower 20, a pre-drying cylinder 30 and a hopper 40. A first exhaust port 11 is provided at the upper part of the tank body 10, and a feeding port 12 is provided at the top. Here, the first exhaust port 11 is used to discharge the hot air with water vapor attached after drying the pharmaceutical raw materials. For example, a one-way valve limited to one-way entry can be provided at the feeding port 12, so that the hot air with water vapor is discharged from the first exhaust port 11, reducing the situation of entering the pre-drying cylinder 30 from the feeding port 12.

[0028] The hot air blower 20 is communicated with the bottom of the tank body 10 and is adapted to provide hot air. The bottom outlet of the pre-drying cylinder 30 is connected to the feeding port 12. A hot air inlet 31 is provided on the lower side wall of the pre-drying cylinder 30. The hot air inlet 31 is communicated with the first exhaust port 11, and a first dryer 32 is provided between the two. Here, it should be noted that under the action of the positive pressure of the hot air in the tank body 10 and the upward kinetic energy of the hot air itself, the hot air in the pre-drying cylinder 30 will flow from bottom to top. A plurality of inclined mesh plates are arranged in a staggered manner up and down above the hot air inlet 31. The inclined mesh plate located above guides the material onto the adjacent inclined mesh plate below. Above the topmost inclined mesh plate. Here, the inclined mesh plate refers to a plate member with mesh holes, so as to facilitate the passage of hot air and facilitate the pre-drying of the pharmaceutical raw materials on the inclined mesh plate. A second exhaust port 33 is provided on the side wall of the pre-drying cylinder 30. The second exhaust port 33 is communicated with the air inlet of the hot air blower 20, and a second dryer 35 is provided between the two. A filter screen 34 is provided at the second exhaust port 33. Here, introducing the hot air with partial heat from the second exhaust port 33 into the inlet of the hot air blower 20 as one of the air sources of the hot air blower 20 can reduce the temperature difference that the hot air blower 20 needs to lift the air and reduce the power required by the hot air blower 20. The hopper 40 is connected to the top inlet of the pre-drying cylinder 30.

[0029] The fluidized bed dryer of the present utility model comprises a tank body 10, a hot air blower 20, a pre-drying cylinder 30 and a hopper 40. During operation, the hot air blower 20 supplies air to the bottom of the tank body 10. The pharmaceutical raw materials are in full contact with the hot air to form a fluidized state. After a period of time, the drying of the pharmaceutical raw materials can be achieved. During the drying process, the hot air with water vapor attached is discharged from the first exhaust port 11. After being dried by the first dryer 32, it enters the pre-drying cylinder 30 from the hot air inlet 31. The pharmaceutical raw materials in the hopper 40 enter the inclined mesh plate from the top inlet of the pre-drying cylinder 30. During the transmission process of the pharmaceutical raw materials on the plurality of inclined mesh plates, they are pre-dried by the hot air with residual heat in the pre-drying cylinder 30, which can effectively improve the pre-drying effect. Finally, the hot air with partial heat passes through the second dryer 35 after being dried from the second exhaust port 33 and is utilized as the air source of the hot air blower 20, reducing the temperature that the hot air blower 20 needs to lift the air and realizing the full utilization of the residual heat attached to the hot air.

[0030] In another embodiment, the inclined screen plate is connected with a vibration motor 36. With such a setting, the inclined screen plate with a vibration effect makes the transmission of the pharmaceutical raw materials on the inclined screen plate smoother. Preferably, the inclination angle of the inclined screen plate with respect to the horizontal direction is 15-25 degrees.

[0031] In another embodiment, a plurality of mesh holes are provided on the inclined screen plate, and the mesh holes of the inclined screen plate located above are larger than those of the adjacent inclined screen plate below. With such a setting, the smaller pharmaceutical raw materials can fall quickly, while the larger pharmaceutical raw materials need a longer pre-drying time to fully remove the internal moisture. After several drops on the inclined screen plate, the large pharmaceutical raw materials can be scattered, which is beneficial to the subsequent drying at the bottom of the tank body 10.

[0032] In another embodiment, a valve 41 is provided at the bottom of the hopper 40 to adjust the input flow rate of the pharmaceutical raw materials.

[0033] In another embodiment, a temperature and humidity sensor is provided on the rear pipeline after the drying treatment of both the first dryer 32 and the second dryer 35. With such a setting, the temperature and humidity in the air can be observed in real time, so as to facilitate the adjustment of the flow rate of the input pharmaceutical raw materials, the speed of the hot air, etc.

[0034] The above are only the preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made by those skilled in the art within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A boiling dryer for pharmaceutical raw materials, characterized in that: It includes a tank body, a hot air blower, a pre-drying cylinder and a hopper. The upper part of the tank body is provided with a first exhaust port and the top is provided with a feed port. The hot air blower is connected to the bottom of the tank body and is suitable for providing hot air. The bottom outlet of the pre-drying cylinder is connected to the feed port. The lower side wall of the pre-drying cylinder is provided with a hot air inlet, which is connected to the first exhaust port and a first dryer is provided between the two. A plurality of inclined mesh plates are staggered above and below the hot air inlet. The upper inclined mesh plate guides the material to the adjacent lower inclined mesh plate. Above the uppermost inclined mesh plate, the side wall of the pre-drying cylinder is provided with a second exhaust port, which is connected to the air inlet of the hot air blower and a second dryer is provided between the two. A filter is provided at the second exhaust port, and the hopper is connected to the top inlet of the pre-drying cylinder.

2. A boiling dryer for pharmaceutical raw materials according to claim 1, characterized in that: The inclined mesh plate is connected with a vibration motor.

3. A boiling dryer for pharmaceutical raw materials according to claim 2, characterized in that: The inclined screen plate has an inclination angle of 15-25 degrees with respect to the horizontal direction.

4. A boiling dryer for pharmaceutical raw materials according to claim 3, characterized in that: The inclined mesh plates are each provided with a plurality of mesh holes, and the mesh holes of the upper inclined mesh plate are larger than those of the adjacent lower inclined mesh plate.

5. A boiling dryer for pharmaceutical raw materials according to claim 1, characterized in that: A valve is provided at the bottom of the hopper.

6. A fluidized bed dryer for pharmaceutical raw materials according to any one of claims 1 to 5, characterized in that: Temperature and humidity sensors are provided on the rear pipelines of the first dryer and the second dryer after the drying process.

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