Intelligent soft capsule drying system with external connection and internal circulation

Abstract

The utility model belongs to the technical field of dehumidifying and drying devices, and discloses an external-connection internal-circulation intelligent soft capsule drying system which comprises a rotary cage drying device, at least one group of dehumidifying and drying devices are arranged on the outer side of the rotary cage drying device, and an air return port and an air inlet of each dehumidifying and drying device are respectively communicated with an inner cavity of the rotary cage drying device. The dehumidifying and drying device comprises a dehumidifying and drying box body, a dehumidifying rotating wheel is arranged in the dehumidifying and drying box body, a front filtering and cooling module is arranged in front of the dehumidifying rotating wheel, a rear filtering and cooling module is arranged behind the dehumidifying rotating wheel, and a control air box is arranged on the dehumidifying and drying box body. An air return port, a positive pressure exhaust port and a recycling exhaust port are sequentially formed in the control air box, the air return port is communicated with an air outlet of the rotary cage drying equipment through an air return pipe, the positive pressure exhaust port is communicated with the external atmosphere, and the recycling exhaust port is communicated with the air inlet side of the dehumidification drying box body; the soft capsule drying device can be used for drying soft capsules.

Description

Technical Field

[0001] This utility model belongs to the technical field of dehumidification and drying devices, specifically, it relates to an intelligent drying system for soft capsules with external connection and internal circulation. Background Technology

[0002] Soft capsules are prepared by compression or dripping methods, and all soft capsules need to be dried after molding. Since the main component of the soft capsule shell is gelatin, the temperature should not be too high, the drying intensity should not be too high, and the drying cycle should not be too long when drying soft capsules. Therefore, the correct drying process for soft capsules is to reduce energy consumption and shorten the drying time while ensuring that the soft capsules are dry.

[0003] Most existing soft capsule drying devices use rotary drum drying equipment. The finished soft capsules are put into the drum of the closed rotary drum drying equipment. The drum is designed as a small closed drying space. The drum is connected to a dehumidifier through an air duct. The dehumidifier outputs low-temperature and low-humidity drying air, which is delivered to the drum through the air inlet duct. The air is absorbed by the fan inside each section of the drum and blown into the drum, forming an internal vortex, which accelerates the drying of the capsule surface.

[0004] Existing capsule drying equipment uses a variety of dehumidifiers, some with built-in circulation dehumidifiers and others with external dehumidifiers. For example, Chinese utility model patent application number 201510018037.1 discloses a rotary dehumidification system for soft capsule production, including a capsule pressing room, a drying room, a rotary dehumidifier unit, and a surface-cooled air conditioner. The rotary dehumidifier unit includes a front surface-cooling module, a rear surface-cooling module, and a dehumidifying rotor. Outdoor fresh air is dehumidified by the combined action of the front surface-cooling module and the dehumidifying rotor, and then cooled by the rear surface-cooling module to provide fresh air to the drying room that meets the requirements. The surface-cooled air conditioner connects the capsule pressing room and the drying room, cooling the air in the drying room before sending it into the capsule pressing room.

[0005] The aforementioned existing dehumidification devices draw in fresh outdoor air, dehumidify it via a dehumidifying impeller, and cool it with a subsequent surface cooling module before delivering the air to the drying room. The air is then dried again in the drying room and cooled by a surface cooling air conditioner before being delivered to the shot-pressing room. The front surface cooling module, dehumidifying impeller, rear surface cooling module, drying room, and surface cooling air conditioner all need to work in close coordination to dehumidify and dry the air before delivery to the shot-pressing room. This results in high overall energy consumption, leading to high drying costs and significantly increasing production costs, hindering low-carbon production. Furthermore, the soft capsules, immediately after shot-pressing, have a high surface moisture content, making them soft and susceptible to deformation from external forces and high temperatures. The overall drying time is long, resulting in high labor intensity for workers and a harsh working environment. The inability to further reduce the relative humidity in the drying area leads to an excessively long drying process. The single air duct design results in uneven contact between the capsules and the airflow, which can easily cause skewing after prolonged transport, leading to uneven drying of the product. Utility Model Content

[0006] The main technical problem to be solved by this utility model is to provide an intelligent drying system for soft capsules with external connection and internal circulation. The overall structure is simple and can select the amount of fresh air and return air to enter according to the external ambient temperature, so that the two air can be mixed and the set outlet air temperature is guaranteed, thereby reducing overall energy consumption, reducing production costs, and achieving low-carbon production.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0008] A soft capsule intelligent drying system with external connection and internal circulation, including a rotary drum drying device, characterized in that: at least one set of dehumidifying drying devices is provided on the outside of the rotary drum drying device, and the return air inlet and air inlet of the dehumidifying drying device are respectively connected to the inner cavity of the rotary drum drying device;

[0009] The dehumidification and drying device includes a dehumidification and drying chamber, a dehumidification impeller is installed inside the chamber, a pre-filter cooling module is installed in front of the impeller, a post-filter cooling module is installed behind the impeller, a control air box is installed on the dehumidification and drying chamber, and a return air inlet, a positive pressure exhaust outlet and a reuse exhaust outlet are sequentially installed on the control air box. The return air inlet is connected to the air outlet of the rotary drum drying equipment through a return air pipe, the positive pressure exhaust outlet is connected to the outside atmosphere, and the reuse exhaust outlet is connected to the air inlet side of the dehumidification and drying chamber.

[0010] The following are further optimizations of the above technical solution by this utility model:

[0011] The control air box is equipped with a return air fan, and the air outlet of the return air fan is provided with partitions at intervals. The partitions are fixedly connected to the inner wall of the control air box and are used to divide the control air box into a positive pressure exhaust chamber and a reuse exhaust chamber. The positive pressure exhaust chamber is located above the partitions and the positive pressure exhaust port is connected to the positive pressure exhaust chamber. The reuse exhaust chamber is located below the partitions and the reuse exhaust port is connected to the reuse exhaust chamber.

[0012] Further optimization: A second automatic air valve is installed in the positive pressure exhaust chamber near the return air fan. The second automatic air valve can automatically adjust its opening size, thereby controlling the amount of air entering the positive pressure exhaust chamber; the amount of air entering the positive pressure exhaust chamber is the amount of air exiting the positive pressure exhaust port.

[0013] Further optimization: A third automatic air valve is installed near the return air fan in the reusable exhaust chamber. The third automatic air valve can automatically adjust its opening size, thereby controlling the amount of air entering the reusable exhaust chamber. The amount of air entering the reusable exhaust chamber is the same as the amount of reusable air at the reusable exhaust port.

[0014] Further optimization: A fresh air inlet is provided on one side of the dehumidifying drying chamber, and the outer end of the fresh air inlet is connected to the outside atmosphere; an air outlet is provided on the other side of the dehumidifying drying chamber, and an air supply pipe is connected to the air outlet. The other end of the air supply pipe is connected to the air inlet of the rotary drum drying equipment through multiple branch pipes.

[0015] An air supply fan is located behind the dehumidification rotor inside the dehumidification drying chamber. The air supply fan works to accelerate the airflow speed inside the dehumidification drying chamber.

[0016] Further optimization: A first automatic air valve is installed at the fresh air inlet. The first automatic air valve can freely adjust its opening degree according to the external ambient temperature, thereby controlling the amount of external fresh air intake.

[0017] Further optimization: the first and second automatic air valves are directly proportional to each other; the third automatic air valve is inversely proportional to the first and second automatic air valves.

[0018] Further optimization: The pre-filter cooling module includes a first medium-efficiency filter located on the side of the fresh air inlet inside the dehumidification and drying chamber, and a front surface cooler is provided at intervals on the leeward side of the first medium-efficiency filter; the front surface cooler and the dehumidification impeller are provided at intervals.

[0019] Further optimization: The post-filtration cooling module includes a post-cooler, which is located inside the dehumidification drying chamber on the side of the air supply fan away from the dehumidification impeller. A second medium-efficiency filter is installed at intervals behind the post-cooler, and a high-efficiency filter is installed at intervals behind the second medium-efficiency filter.

[0020] Further optimization: An oil filter box is connected in series on the return air duct, and an oil filter is installed inside the oil filter box. The oil filter is used to filter oil from the hot and humid air flowing through the oil filter box.

[0021] This utility model adopts the above-mentioned technical solution, which is ingeniously conceived and reasonably structured. By using an external dehumidifying and drying chamber, the air duct is long and the distance between the dehumidifying rotor and the drum is far. At the same time, an oil and gas filter device is installed in the air duct, which can effectively reduce the impact of oil and gas on the dehumidifying rotor and extend the rotor's life. The rotor's life is more than 8 years in this way. The internal circulation method is adopted. After the dehumidifying rotor dehumidifies the air, the dry air is finally delivered to the drum, which has no impact on the room's temperature, humidity, or pressure difference. The distance between the drum and the dehumidifying rotor is far. The regeneration steam heating pipeline heats the dehumidifying rotor to dry it. The maximum regeneration heating temperature can reach 150℃, resulting in a good deep dehumidification effect.

[0022] In this invention, the first and second automatic air valves are directly proportionally regulated, meaning their openings increase or decrease simultaneously. The third automatic air valve is inversely proportional to the first and second automatic air valves. By automatically adjusting the first, second, and third automatic air valves, the volume of fresh air intake and the volume of recirculated air can be adjusted to ensure that the temperature of the dry air discharged from the air outlet is the set temperature, thereby improving the performance.

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0025] Figure 2 This is a schematic diagram of the air dehumidification device in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the return air treatment box in an embodiment of this utility model;

[0027] Figure 4 This is a schematic diagram of the return air filter box in an embodiment of this utility model.

[0028] In the diagram: 1-Rotary drum dryer; 2-Dehumidifying drying chamber; 201-Fresh air inlet; 202-Air outlet; 203-Air duct; 204-First automatic air valve; 205-First medium-efficiency filter; 206-Pre-cooler; 207-Regenerated steam heating pipeline; 208-Drive motor; 209-Air supply fan; 210-Post-cooler; 211-Second medium-efficiency filter; 212-High-efficiency filter; 3-Dehumidifying drum; 4-Control air box; 401-Return air outlet; 402-Positive pressure exhaust outlet; 403-Recycled exhaust outlet; 404-Return air duct; 405-Baffle; 406-Positive pressure exhaust chamber; 407-Recycled exhaust chamber; 408-Return air fan; 409-Second automatic air valve; 410-Third automatic air valve; 5-Oil filter box; 501-Oil filter. Detailed Implementation

[0029] like Figure 1-4 As shown: A soft capsule intelligent drying system with external connection and internal circulation includes a rotary drum drying device 1. At least one set of dehumidifying drying devices is provided on the outside of the rotary drum drying device 1. The return air inlet and air inlet of the dehumidifying drying device are respectively connected to the inner cavity of the rotary drum drying device 1. The dehumidifying drying device is used to deliver dry drying air into the rotary drum drying device 1. The hot and humid air in the rotary drum drying device 1 is either drawn into the dehumidifying drying device or discharged externally.

[0030] In this embodiment, the rotary drying equipment 1 is existing technology. Its specific structure includes a support frame and a rotary drum. The rotary drum is divided into three stages: a shaping stage, a pre-drying stage, and a final drying stage. The temperature of each stage is different: shaping at 20°C, pre-drying at 25°C, and final drying at 27-30°C. Each section of the rotary drum is equipped with a heating device, and a finned heater is also provided in the air duct of the final drying stage. By increasing the temperature inside the drum in the above ways, the moisture inside the capsule is accelerated to evaporate, the inside of the capsule is dried faster, and the moisture in the capsule is prevented from rebounding.

[0031] The dehumidification and drying device includes a dehumidification and drying chamber 2, a dehumidification rotor 3 is installed inside the dehumidification and drying chamber 2, a pre-filter cooling module is installed in front of the dehumidification rotor 3, a post-filter cooling module is installed behind the dehumidification rotor 3, a control air box 4 is installed on the dehumidification and drying chamber 2, and a return air inlet 401, a positive pressure exhaust outlet 402, and a reuse exhaust outlet 403 are sequentially installed on the control air box 4. The return air inlet 401 is connected to the air outlet of the rotary drum drying equipment 1 through a return air pipe 404. The positive pressure exhaust outlet 402 is connected to the outside atmosphere, and the reuse exhaust outlet 403 is connected to the air inlet side of the dehumidification and drying chamber 2.

[0032] A fresh air inlet 201 is provided on one side of the dehumidifying and drying chamber 2. The outer end of the fresh air inlet 201 is connected to the outside atmosphere, and the inner end of the fresh air inlet 201 is connected to the inner cavity of the dehumidifying and drying chamber 2.

[0033] An air outlet 202 is provided on the other side of the dehumidifying and drying chamber 2, and the inner end of the air outlet 202 is connected to the inner cavity of the dehumidifying and drying chamber 2. An air supply pipe 203 is connected to the air outlet 202, and the other end of the air supply pipe 203 is connected to the air inlet of the rotary drum drying equipment 1 through multiple branch pipes.

[0034] A first automatic air valve 204 is installed at the fresh air inlet 201. The first automatic air valve 204 can freely adjust its opening degree according to the external ambient temperature, thereby controlling the amount of external fresh air intake.

[0035] The pre-filter cooling module includes a first medium-efficiency filter 205 located inside the dehumidification and drying chamber 2 on one side of the fresh air inlet 201, and a front surface cooler 206 is provided at intervals on the leeward side of the first medium-efficiency filter 205.

[0036] In this embodiment, the dehumidifying impeller 3 is spaced behind the front surface cooler 206. An external cooling water pipe is connected in series to the front surface cooler 206. The external cooling water pipe is used to deliver cooling water into the front surface cooler 206. The operation of the front surface cooler 206 is used to cool and reduce the temperature of the hot and humid air flowing through the front surface cooler 206.

[0037] In this embodiment, the first medium-efficiency filter 205 is used to filter the flowing air to prevent impurities in the air from entering the rear of the dehumidification and drying chamber 2.

[0038] In this embodiment, the dehumidifying impeller 3 is a prior art technology used to dehumidify and dry the hot and humid air flowing through the dehumidifying impeller 3, which is convenient to use.

[0039] A drying chamber is located above and outside the dehumidifying impeller 3 inside the dehumidifying drying chamber 2. The drying chamber is used to dry the dehumidifying impeller 3. A regenerating steam heating pipe 207 and a drive motor 208 are provided above the dehumidifying drying chamber 2. The regenerating steam heating pipe 207 is connected to the drying chamber, and the other end of the regenerating steam heating pipe 207 is connected to a regenerating steam source. The power output end of the drive motor 208 is connected to the dehumidifying impeller 3 for transmission, and the drive motor 208 is used to drive the dehumidifying impeller 3 to rotate.

[0040] In addition to this embodiment, the position of the dehumidifying rotor 3 can also be replaced by an air-cooled dehumidifying device, a water-cooled dehumidifying device, or a solvent dehumidifying device.

[0041] Inside the dehumidification drying chamber 2, a blower 209 is located behind the dehumidification rotor 3. The blower 209 works to accelerate the airflow speed inside the dehumidification drying chamber 2 and improve the performance.

[0042] The post-filtration cooling module includes a post-cooler 210, which is located inside the dehumidification drying chamber 2 on the side of the blower 209 away from the dehumidification impeller 3. A second medium-efficiency filter 211 is arranged at intervals behind the post-cooler 210, and a high-efficiency filter 212 is arranged at intervals behind the second medium-efficiency filter 211.

[0043] The air supply fan 209 is used to draw in air from the fresh air inlet 201, which then passes through the pre-filter cooling module, the dehumidification wheel 3, and the post-filter cooling module before being discharged through the air outlet 202.

[0044] An external cooling water pipeline is connected in series to the rear surface cooler 210. The external cooling water pipeline is used to supply cooling water into the rear surface cooler 210. The operation of the rear surface cooler 210 is used to further cool and lower the temperature of the dry air that has been dehumidified by the dehumidification wheel 3, making it convenient to use.

[0045] In this embodiment, the second medium-efficiency filter 211 is used to further filter the flowing air to prevent impurities in the air from entering the downstream.

[0046] In this embodiment, the high-efficiency filter 212 is used to efficiently filter the air filtered by the second medium-efficiency filter 211, preventing impurities in the air from entering the air outlet 202 and improving the performance.

[0047] In this embodiment, the temperature of the dry air discharged from the air outlet 202 of the dehumidifying drying chamber 2 is set to 20±2℃, that is, the required temperature of the dry air entering the rotary drum drying equipment 1 is 20±2℃.

[0048] In this embodiment, during the winter in northern my country, when the external temperature is below 5°C, the temperature of the dry and cold air in the external environment meets the drying temperature requirements of the rotary drying equipment 1. At this time, the front surface cooler 206 and the rear surface cooler 210 in the dehumidification drying chamber 2 are in the closed state, that is, the front surface cooler 206 and the rear surface cooler 210 are different and do not generate energy consumption, thereby reducing the overall energy consumption of the dehumidification drying chamber 2 during operation and reducing production costs.

[0049] The first automatic air valve 204 is fully open. At this time, the blower 209 works to draw in fresh, dry, and cold air from outside into the dehumidifying drying chamber 2. The fresh, dry, and cold air is filtered by the first medium-efficiency filter 205, and then further dehumidified by the dehumidifying impeller 3. The temperature of the dry, cold air after dehumidification by the dehumidifying impeller 3 will increase. When the temperature of the air rises to 20±2℃, it meets the required outlet temperature. At this time, the air is guided by the blower 209 and filtered by the second medium-efficiency filter 211 and the high-efficiency filter 212 before being discharged through the air outlet 202. Then, the air is guided by the air duct 203 to enter the rotary drum dryer 1 to dry the materials inside the rotary drum dryer 1. This method is convenient to use, makes full use of the dry, cold air in winter, reduces the overall energy consumption of the drying system, and achieves green and energy-saving production.

[0050] The control air box 4 is equipped with a return air fan 408, and the air outlet of the return air fan 408 is provided with partitions 405 at intervals; the partitions 405 are fixedly connected to the inner wall of the control air box 4, and are used to divide the control air box 4 into a positive pressure exhaust chamber 406 and a reuse exhaust chamber 407.

[0051] The positive pressure exhaust chamber 406 is located above the partition 405, and the positive pressure exhaust port 402 is connected to the positive pressure exhaust chamber 406.

[0052] The reuse exhaust chamber 407 is located below the partition 405, and the reuse exhaust port 403 is connected to the reuse exhaust chamber 407. The other end of the reuse exhaust port 403 is connected to the cavity between the fresh air inlet 201 and the first medium-efficiency filter 205 in the dehumidification and drying box 2.

[0053] The reclaimed air in the reclaimed exhaust chamber 407 enters the dehumidification and drying chamber 2 through the reclaimed exhaust port 403. At this time, the reclaimed air is located on the windward side of the first medium-efficiency filter 205, that is, the reclaimed air can be filtered by the first medium-efficiency filter 205.

[0054] A second automatic air valve 409 is provided in the positive pressure exhaust chamber 406 near the return air fan 408. The second automatic air valve 409 can automatically adjust its opening size, thereby controlling the amount of air entering the positive pressure exhaust chamber 406. The amount of air entering the positive pressure exhaust chamber 406 is the same as the amount of air exiting the positive pressure exhaust port 402.

[0055] A third automatic air valve 410 is provided at the position of the reusable exhaust chamber 407 near the return air fan 408. The third automatic air valve 410 can automatically adjust its opening size, thereby controlling the amount of air entering the reusable exhaust chamber 407. The amount of air entering the reusable exhaust chamber 407 is the same as the amount of reusable air at the reusable exhaust port 403.

[0056] In this embodiment, the first automatic air valve 204, the second automatic air valve 409, and the third automatic air valve 410 are all automatically adjustable.

[0057] The first automatic air valve 204 and the second automatic air valve 409 are directly proportionally regulated, meaning that the opening of the first automatic air valve 204 and the second automatic air valve 409 increases or decreases simultaneously. The third automatic air valve 410 is inversely proportionally regulated to the first automatic air valve 204 and the second automatic air valve 409; that is, when the opening of the third automatic air valve 410 increases, the opening of the first automatic air valve 204 and the second automatic air valve 409 decreases; when the opening of the third automatic air valve 410 decreases, the opening of the first automatic air valve 204 and the second automatic air valve 409 increases.

[0058] When the third automatic air valve 410 is fully open, the first automatic air valve 204 and the second automatic air valve 409 are fully closed; conversely, when the third automatic air valve 410 is fully closed, the first automatic air valve 204 and the second automatic air valve 409 are fully open.

[0059] An oil filter box 5 is connected in series on the return air duct 404. An oil filter 501 is installed inside the oil filter box 5. The oil filter 501 is used to filter oil from the humid and hot air flowing through the oil filter box 5, thereby reducing the amount of oil carried by the humid and hot air from entering the dehumidification and drying chamber 2 and improving the performance.

[0060] During use, the front surface cooler 206 and the rear surface cooler 210 are turned off depending on the ambient temperature. When the ambient temperature is below 10℃, the front surface cooler 206 and the rear surface cooler 210 are turned off and do not work, so the front surface cooler 206 and the rear surface cooler 210 do not consume energy. When the ambient temperature is above 10℃, the front surface cooler 206 and the rear surface cooler 210 need to be turned on and work.

[0061] When the ambient temperature is below 10℃, the first automatic air valve 204 opens, and the supply air fan 209 and return air fan 408 work synchronously. At this time, fresh, dry, and cold air from outside enters the dehumidification drying chamber 2 through the first automatic air valve 204 and is filtered by the first medium-efficiency filter 205. Then, the fresh, dry, and cold air is further dehumidified by the dehumidification rotor 3, and the temperature of the dry, cold air after dehumidification by the dehumidification rotor 3 will increase. When the temperature of the air rises to 20±2℃, it meets the required outlet temperature. At this time, the air is guided by the supply air fan 209 and filtered by the second medium-efficiency filter 211 and the high-efficiency filter 212 before being discharged through the air outlet 202. Then, the air is guided by the air supply pipe 203 to enter the rotary drum dryer 1 to dry the materials inside the rotary drum dryer 1. This method is convenient to use, makes full use of the dry, cold air in winter, reduces the overall energy consumption of the drying system, and achieves green and energy-saving production.

[0062] The hot and humid air in the rotary drum dryer 1 enters the return air duct 404 through the air outlet, and is drawn in by the return air fan 408 to increase the flow speed of the hot and humid air in the return air duct 404. When the hot and humid air in the return air duct 404 flows through the oil filter box 5, the oil filter 501 filters the oil in the hot and humid air, reducing the amount of oil carried by the hot and humid air entering the control air box 4 and improving the performance.

[0063] When the first automatic air valve 204 is fully open, the second automatic air valve 409 is also fully open, and the third automatic air valve 410 is fully closed. At this time, the hot and humid air in the control air box 4 is discharged under positive pressure through the positive pressure exhaust chamber 406 and the positive pressure exhaust port 402 under the action of the return air fan 408. That is, the hot and humid air that flows back into the rotary drum dryer 1 is not reused.

[0064] In addition to this embodiment, the positive pressure exhaust port 402 can be connected to an external air handling unit via an external pipeline. The external air handling unit can further treat the hot and humid air to avoid environmental pollution. The external air handling unit is existing technology and will not be described in detail here.

[0065] When the temperature of the dry, cold air dehumidified by the dehumidifying impeller 3 is below 18°C, the first automatic air valve 204 automatically adjusts its opening to decrease. The first automatic air valve 204 and the second automatic air valve 409 are directly proportional, meaning that when the opening of the first automatic air valve 204 decreases, the opening of the second automatic air valve 409 also decreases. The first automatic air valve 204 and the third automatic air valve 410 are inversely proportional, meaning that when the opening of the first automatic air valve 204 decreases, the opening of the third automatic air valve 410 also increases. At this time, the exhaust volume of the positive pressure exhaust port 402 decreases, and a portion of the humid and hot air in the control air box 4 enters the dehumidifying and drying chamber 2 through the reuse exhaust chamber 407 and the reuse exhaust port 403. This humid and hot air mixes with the fresh, dry, cold air entering through the fresh air inlet 201 to increase the temperature of the air in the dehumidifying and drying chamber 2, thereby maintaining the dry air discharged from the air outlet 202 at 20±2°C.

[0066] When the ambient temperature is greater than 10℃, the first automatic air valve 204 is fully closed, the second automatic air valve 409 is fully closed, and the third automatic air valve 410 is fully open. The front surface cooler 206 and the rear surface cooler 210 need to work. The front surface cooler 206 and the rear surface cooler 210 work to cool down the hot and humid air, and the dehumidifying wheel 3 is used to dehumidify the hot and humid air. The air flowing in the dehumidifying and drying chamber 2 is filtered in multiple stages by the first medium-efficiency filter 205, the second medium-efficiency filter 211 and the high-efficiency filter 212 to ensure that the temperature of the dry air discharged from the air outlet 202 is 20±2℃.

[0067] For those skilled in the art, any changes, modifications, substitutions, and variations made to the implementation methods without departing from the principles and spirit of this utility model, based on the teachings of this utility model, still fall within the protection scope of this utility model.

Claims

1. A smart drying system for soft capsules with external connection and internal circulation, comprising a rotary drying device (1), characterized in that: At least one set of dehumidifying drying devices is provided on the outside of the rotary drum drying equipment (1), and the return air inlet and air inlet of the dehumidifying drying devices are respectively connected to the inner cavity of the rotary drum drying equipment (1); The dehumidification and drying device includes a dehumidification and drying chamber (2), a dehumidification wheel (3) is provided inside the dehumidification and drying chamber (2), a front filter cooling module is provided in front of the dehumidification wheel (3), a rear filter cooling module is provided behind the dehumidification wheel (3), a control air box (4) is provided on the dehumidification and drying chamber (2), and a return air inlet (401), a positive pressure exhaust outlet (402) and a reuse exhaust outlet (403) are provided on the control air box (4) in sequence. The return air inlet (401) is connected to the air outlet of the rotary drum drying equipment (1) through a return air pipe (404), the positive pressure exhaust outlet (402) is connected to the outside atmosphere, and the reuse exhaust outlet (403) is connected to the air inlet side of the dehumidification and drying chamber (2).

2. The intelligent drying system for soft capsules with external connection and internal circulation according to claim 1, characterized in that: The control air box (4) is equipped with a return air fan (408), and a partition (405) is provided at intervals at the air outlet of the return air fan (408); the partition (405) is fixedly connected to the inner wall of the control air box (4) and is used to divide the control air box (4) into a positive pressure exhaust chamber (406) and a reuse exhaust chamber (407). The positive pressure exhaust chamber (406) is located above the partition (405), and the positive pressure exhaust port (402) is connected to the positive pressure exhaust chamber (406); the reuse exhaust chamber (407) is located below the partition (405), and the reuse exhaust port (403) is connected to the reuse exhaust chamber (407).

3. The intelligent drying system for soft capsules with external connection and internal circulation according to claim 2, characterized in that: A second automatic air valve (409) is provided in the positive pressure exhaust chamber (406) near the return air fan (408). The second automatic air valve (409) can automatically adjust its opening size, thereby controlling the amount of air entering the positive pressure exhaust chamber (406). The amount of air entering the positive pressure exhaust chamber (406) is the same as the amount of air exiting the positive pressure exhaust port (402).

4. The intelligent drying system for soft capsules with external connection and internal circulation according to claim 3, characterized in that: A third automatic air valve (410) is provided at the position of the reusable exhaust chamber (407) near the return air fan (408). The third automatic air valve (410) can automatically adjust its opening size, thereby controlling the amount of air entering the reusable exhaust chamber (407). The amount of air entering the reusable exhaust chamber (407) is the same as the amount of reusable air at the reusable exhaust port (403).

5. The intelligent drying system for soft capsules with external connection and internal circulation according to claim 4, characterized in that: A fresh air inlet (201) is provided on one side of the dehumidifying drying chamber (2), and the outer end of the fresh air inlet (201) is connected to the outside atmosphere; an air outlet (202) is provided on the other side of the dehumidifying drying chamber (2), and an air supply pipe (203) is connected to the air outlet (202), and the other end of the air supply pipe (203) is connected to the air inlet of the rotary drying equipment (1) through multiple branch pipes; Inside the dehumidifying drying chamber (2), a blower (209) is located behind the dehumidifying impeller (3). The blower (209) works to accelerate the airflow speed inside the dehumidifying drying chamber (2).

6. The intelligent drying system for soft capsules with external connection and internal circulation according to claim 5, characterized in that: A first automatic air valve (204) is installed at the fresh air inlet (201). The first automatic air valve (204) can freely adjust its opening degree according to the external ambient temperature, thereby controlling the amount of fresh air entering the air.

7. The intelligent drying system for soft capsules with external connection and internal circulation according to claim 6, characterized in that: The first automatic air valve (204) and the second automatic air valve (409) are directly proportional; the third automatic air valve (410) is inversely proportional to the first automatic air valve (204) and the second automatic air valve (409).

8. The intelligent drying system for soft capsules with external connection and internal circulation according to claim 7, characterized in that: The pre-filter cooling module includes a first medium-efficiency filter (205) located inside the dehumidification and drying box (2) on one side of the fresh air inlet (201), and a front surface cooler (206) is provided at intervals on the leeward side of the first medium-efficiency filter (205); the front surface cooler (206) and the dehumidification impeller (3) are provided at intervals.

9. The intelligent drying system for soft capsules with external connection and internal circulation according to claim 8, characterized in that: The post-filter cooling module includes a post-cooler (210), which is located inside the dehumidification drying chamber (2) on the side away from the dehumidification impeller (3) from the blower (209). A second medium-efficiency filter (211) is provided at intervals behind the post-cooler (210), and a high-efficiency filter (212) is provided at intervals behind the second medium-efficiency filter (211).

10. The intelligent drying system for soft capsules with external connection and internal circulation according to claim 9, characterized in that: An oil filter box (5) is connected in series on the return air duct (404). An oil filter (501) is installed inside the oil filter box (5). The oil filter (501) is used to filter oil from the hot and humid air flowing through the oil filter box (5).

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