Multi-specification multifunctional extraction tank medicine decocting and filtering integrated device

Abstract

The application discloses a multi-specification multifunctional extraction tank medicine decocting and filtering integrated device, which comprises a decocting tank, a stirring assembly for stirring medicine is installed on the decocting tank, a feeding cover is arranged on the decocting tank, a sealing cover is connected to the feeding cover, a discharge pipe is arranged at the lower end of the decocting tank, and a three-way reversing valve is connected to the discharge pipe; a jacket is arranged on the decocting tank, and a temperature control assembly is arranged on the jacket; a first filter screen is connected to the decocting tank through a rotating assembly, and a second filter screen is connected to the first filter screen through an adjusting assembly; and a pulse assembly for cleaning the first filter screen and the second filter screen is installed on the decocting tank; the application realizes high integration and automation of the medicine decocting and solid-liquid filtering processes, significantly improves production efficiency and product quality, and through the innovative adjusting assembly, stepless adjustment of the filter aperture is realized, and excellent versatility and adaptability of a single device are achieved.

Description

Technical Field

[0001] This invention relates to the field of traditional Chinese medicine pharmaceutical engineering technology, specifically to an integrated device for decoction and filtration of medicinal materials using multi-specification, multi-functional extraction tanks. Background Technology

[0002] Extraction of traditional Chinese medicine (TCM) herbs is a core step in the production of TCM preparations, and the rationality of its process directly affects the retention rate of effective components in the herbs and the efficacy of the finished product. Currently, the traditional decoction method remains the primary method of herb extraction. However, existing extraction equipment, in practical applications, has gradually revealed numerous problems that are incompatible with the needs of modern TCM production. These problems are specifically manifested in the following aspects: Existing extraction equipment often separates the decoction of medicinal herbs into independent processes and solid-liquid filtration: after the herbs are heated and extracted in the decoction container, they need to be transferred through pipelines to specialized filtration equipment for separation. This step-by-step operation not only prolongs the production process and increases the number of material transfer links between equipment, but also easily leads to the residue of the medicinal liquid in the pipelines or dead corners of the equipment during the transfer process, resulting in the loss of effective components. At the same time, the temperature fluctuation of the medicinal liquid during the transfer process is relatively large, which may affect the stability of some active ingredients, especially for herbs with sensitive components, where the drawbacks of step-by-step operation are more prominent.

[0003] Different medicinal materials exhibit significant differences in morphology and the characteristics of their residues after decoction: root and rhizome herbs produce larger particles of residue, requiring larger filter pores to ensure filtration speed; flower and leaf herbs produce finer residues, requiring smaller filter pores to reduce residue contamination of the decoction. Existing filtration devices mostly use filter screens or plates with fixed pore sizes, suitable only for single or a few specifications of medicinal materials. Processing different types of medicinal materials necessitates stopping the machine to replace the filter media, increasing operational complexity and labor costs, disrupting production continuity, and failing to meet the demands of multi-variety, small-batch production. Therefore, we need to propose an integrated decoction and filtration device for medicinal materials with multi-specification, multi-functional extraction tanks. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated device for decocting and filtering medicinal materials using multi-specification and multi-functional extraction tanks, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A multi-specification, multi-functional extraction tank integrated device for decocting and filtering medicinal herbs, including: A decoction pot, wherein a stirring component for stirring medicinal materials is installed on the decoction pot, a feeding hood is provided on the decoction pot, a sealing cover is connected to the feeding hood, and a discharge pipe is provided at the lower end of the decoction pot, and a three-way reversing valve is connected to the discharge pipe; The cooking pot is equipped with a jacket, and the jacket is equipped with a temperature control component; The cooking pot is connected to a first filter screen via a rotating assembly, and a second filter screen is connected to the first filter screen via an adjusting assembly. Differential pressure sensors are installed on both sides of the first and second filter screens. The cooking pot is equipped with a pulse assembly for cleaning the first and second filters.

[0006] Preferably, the decoction pot is equipped with a water inlet pipe, a control valve is installed on the water inlet pipe, and liquid concentration sensors are installed at both the upper and lower ends of the decoction pot.

[0007] Preferably, the frying pot is equipped with a temperature sensor and a pressure sensor, and the frying pot is equipped with an exhaust pipe and an exhaust valve.

[0008] Preferably, the stirring assembly includes a first drive motor and a stirring frame, the stirring frame being rotatably connected to the cooking pot, the first drive motor being mounted on the cooking pot, and the output end of the first drive motor being connected to the extension end of the stirring frame that passes through the cooking pot.

[0009] Preferably, the stirring rack is equipped with a scraper, and the scraper is in contact with the inner wall of the cooking pot.

[0010] Preferably, the temperature control component includes an electric heater, two first connecting pipes and a circulation pump. The jacket contains a circulation pipe, the electric heater is mounted on the jacket, the two ends of the two first connecting pipes are respectively connected to the electric heater and the circulation pipe, and the circulation pump is connected to one of the first connecting pipes.

[0011] Preferably, the rotating assembly includes a second drive motor and two first rotating rods. The two sides of the first filter screen are rotatably connected to the cooking pot through the first rotating rods. The second drive motor is installed on the cooking pot, and the output end of the second drive motor is connected to the extension end of the first rotating rod through the cooking pot.

[0012] Preferably, the adjustment assembly includes a sealing frame, a third drive motor, and a second rotating rod. The third drive motor is mounted on the first filter screen through the sealing frame, and the second filter screen is rotatably connected to the first filter screen through the second rotating rod. The output end of the third drive motor is connected to the second rotating rod.

[0013] Preferably, the pulse assembly includes an air pump, a second connecting pipe, an annular pipe, and a plurality of nozzles. The annular pipe is installed inside the cooking pot, the plurality of nozzles are installed on the annular pipe, the air pump is installed on the cooking pot, and the two ends of the second connecting pipe are connected to the annular pipe and the air pump, respectively.

[0014] Preferably, the cooking pot is equipped with a controller, which is electrically connected to the cooking pot, a three-way reversing valve, a control valve, a liquid concentration sensor, a temperature sensor, a gas pressure sensor, an exhaust valve, a first drive motor, an electric heater, a circulating pump, a differential pressure sensor, a second drive motor, a third drive motor, and a gas pump.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention achieves a high degree of integration and automation between the decoction and solid-liquid filtration processes of medicinal herbs, significantly improving production efficiency and product quality. By directly integrating adjustable filters (first and second filters) inside the decoction tank, the extraction, stirring, and precise filtration of medicinal herbs can be completed within the same sealed container, completely eliminating the transfer of materials between equipment. This not only significantly shortens the production cycle but also effectively avoids the loss and degradation of effective components due to pipeline residues and temperature fluctuations, ensuring the stability and uniformity of the medicinal liquid composition. Simultaneously, the pulse assembly enables online automatic cleaning of the filters, further ensuring the continuous operation capability of the equipment.

[0016] 2. This invention achieves stepless adjustment of the filter pore size through an innovative adjustment component, giving a single device excellent versatility and adaptability. By driving the first and second filter screens to undergo relative displacement (such as rotation), the relative position of their filter pores is changed, thereby continuously and precisely adjusting the effective filter pore size over a wide range. One set of equipment can meet the filtration needs of different materials, from large-particle residues of roots and stems to fine-grained residues of flowers and leaves, without the need to stop the machine to replace filter media. It perfectly solves the filtration adaptation problem in the production of multiple varieties and small batches of traditional Chinese medicine, greatly reducing operational complexity and equipment investment costs.

[0017] 3. This invention constructs a highly efficient and controllable dynamic extraction environment through the synergistic effect of the stirring component, temperature control component, and integrated structure. The jacket and temperature control component ensure the uniformity and precision of the temperature field within the tank; the stirring component continuously agitates during the process, which not only enhances the mass and heat transfer process, improving extraction efficiency and yield, but also prevents the medicinal materials from depositing and scaling on the tank bottom and filter screen, and together with the pulse cleaning component, ensures the continuous unobstructed flow of the filtration channel. The entire system forms a closed, controllable, and optimized extraction unit, providing a reliable equipment foundation for improving the quality standards of traditional Chinese medicine extraction processes. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the rear view structure of the present invention; Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0019] In the diagram: 1. Cooking tank; 2. Feed hood; 3. Sealing cap; 4. Discharge pipe; 5. Three-way reversing valve; 6. Jacket; 7. First filter screen; 8. Second filter screen; 9. Water inlet pipe; 10. Control valve; 11. Liquid concentration sensor; 12. Temperature sensor; 13. Pressure sensor; 14. Exhaust pipe; 15. Exhaust valve; 16. First drive motor; 17. Stirring rack; 18. Scraper; 19. Electric heater; 20. First connecting pipe; 21. Circulation pump; 22. Second drive motor; 23. First rotating rod; 24. Sealing frame; 25. Third drive motor; 26. Second rotating rod; 27. Air pump; 28. Second connecting pipe; 29. ​​Annular pipe; 30. Nozzle; 31. Controller; 32. Differential pressure sensor; 33. Circulation pipe. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example: Please see Figures 1-4 The present invention provides a technical solution: A multi-specification, multi-functional extraction tank integrated device for decocting and filtering medicinal herbs, including: A decoction tank 1 is equipped with a stirring assembly for stirring medicinal materials. The stirring assembly includes a first drive motor 16 and a stirring frame 17. The stirring frame 17 is rotatably connected to the decoction tank 1. The first drive motor 16 is installed on the decoction tank 1, and the output end of the first drive motor 16 is connected to the extension end of the stirring frame 17 that passes through the decoction tank 1. The stirring frame 17 is equipped with a scraper 18, and the scraper 18 is in contact with the inner wall of the decoction tank 1. The decoction tank 1 is equipped with a feed hood 2, and a sealing cover 3 is connected to the feed hood 2. The lower end of the decoction tank 1 is equipped with a discharge pipe 4, and a three-way reversing valve 5 is connected to the discharge pipe 4. The decoction tank 1 is equipped with a water inlet pipe 9, and a control valve 10 is installed on the water inlet pipe 9. Liquid concentration sensors 11 are installed at both the upper and lower ends of the decoction tank 1. Temperature sensors 12 and air pressure sensors 13 are installed on the decoction tank 1. The decoction tank 1 is equipped with an exhaust pipe 14, and an exhaust valve 15 is installed on the exhaust pipe 14. After the device is started, it first enters the preparation stage: the operator opens the sealing cover 3 of the feed hood 2 to add the medicinal materials, closes the sealing cover 3 to ensure the tank is sealed, and inputs parameters such as the type of medicinal materials through the controller 31. The external water supply device is then connected to the water inlet pipe 9, and the controller 31 automatically activates the control valve 10 of the water inlet pipe 9 to add an appropriate amount of water according to the preset ratio, providing a suitable solid-liquid environment for subsequent decoction. This stage, relying on the sealing design and intelligent water addition logic, not only ensures the airtightness of the tank environment but also lays the foundation for the efficient utilization of raw materials and reduces solvent waste.

[0022] The cooking pot 1 is provided with a jacket 6, and the jacket 6 is provided with a temperature control component. The temperature control component includes an electric heater 19, two first connecting pipes 20 and a circulation pump 21. The jacket 6 is provided with a circulation pipe 33. The electric heater 19 is installed on the jacket 6. The two ends of the two first connecting pipes 20 are respectively connected to the electric heater 19 and the circulation pipe 33. The circulation pump 21 is connected to one of the first connecting pipes 20. Then, the decoction stage begins. Controller 31 activates the temperature control components: electric heater 19 heats the circulating medium (such as heat transfer oil or hot water) within the jacket 6, and circulating pump 21 drives the heated medium to flow at high speed within the circulating pipe 33, transferring heat to the internal materials through the tank wall of the decoction tank 1; temperature sensor 12 collects the tank temperature in real time and feeds it back to controller 31. If the temperature deviates from the preset process value (such as 60-70℃ for heat-sensitive medicinal materials and 90-100℃ for root and rhizome medicinal materials), controller 31 dynamically adjusts the output power of electric heater 19 and the rotation speed of circulating pump 21 to ensure that the tank temperature remains stable within the target range. Simultaneously, the first drive motor 16 drives the stirring rack 17 to rotate. The scraper 18 on the stirring rack 17 is in close contact with the inner wall of the decoction tank 1. This design can not only scrape off the medicinal materials adhering to the tank wall in real time (avoiding raw material waste and local overheating and carbonization), but also break the static liquid film on the surface of the tank wall, accelerating the heat transfer efficiency to the material and making the medicinal materials more evenly heated. During the stirring process, the pressure sensor 13 continuously monitors the pressure inside the tank. If the pressure exceeds the safety threshold due to the steam generated by heating, the controller 31 automatically opens the exhaust valve 15 on the exhaust pipe 14 to release the pressure. After the pressure drops back to the safe range, the exhaust valve 15 is closed, ensuring the safety and stability of the decoction environment throughout the process. In this stage, through the synergistic effect of "precise temperature control + efficient stirring + pressure regulation", the stable leaching of effective components is achieved, avoiding the component loss and temperature fluctuations caused by "transferring to filtration equipment after decoction" in traditional processes.

[0023] A first filter screen 7 is connected to a cooking pot 1 via a rotating assembly. The rotating assembly includes a second drive motor 22 and two first rotating rods 23. The first filter screen 7 is rotatably connected to the inside of the cooking pot 1 via the first rotating rods 23. The second drive motor 22 is installed on the cooking pot 1, and the output end of the second drive motor 22 is connected to the extension end of the first rotating rod 23 that passes through the cooking pot 1. A second filter screen 8 is connected to the first filter screen 7 via an adjusting assembly. The adjusting assembly includes a sealing frame 24, a third drive motor 25, and a second rotating rod 26. The third drive motor 25 is installed on the first filter screen 7 via the sealing frame 24. The second filter screen 8 is rotatably connected to the first filter screen 7 via the second rotating rod 26. The output end of the third drive motor 25 is connected to the second rotating rod 26. Differential pressure sensors 32 are installed on both sides of the first filter screen 7 and the second filter screen 8. After decoction, the process enters the filtration and adjustment stage. Liquid concentration sensors 11 at the upper and lower ends of the decoction tank 1 monitor the concentration difference of the decoction. If the difference is large, the controller 31 increases the stirring speed to enhance mixing until the concentration is uniform. If the concentration of the decoction is too high, the control valve 10 is opened, and an external water supply device adds an appropriate amount of water to the decoction tank 1 through the water inlet pipe 9. If the concentration meets the standard, the controller 31 starts the rotating component and the adjustment component. The second drive motor 22 drives the first filter screen 7 to rotate as a whole, adjusting the filtration angle to reduce local residue accumulation. The third drive motor 25 drives the second filter screen 8 to rotate relative to the first filter screen 7. The stepless adjustment of the filtration pore size is achieved by continuously changing the overlap of the filter pores of the two filter screens (e.g., when processing root and rhizome medicinal materials, the filter pores completely overlap to form a large pore size, and when processing flower and leaf medicinal materials, the second filter screen 8 is rotated to reduce the overlapping area to form a small pore size). It can adapt to the residue characteristics of different medicinal materials without disassembly. This dynamic filtration design breaks through the limitations of traditional fixed filter holes, greatly improves the equipment's adaptability to various specifications of medicinal materials, reduces manual intervention, and ensures production continuity. During this process, the differential pressure sensor 32 collects the pressure difference between the first filter screen 7 and the second filter screen 8 in real time. If the pressure difference is abnormal during the initial filtration stage (such as being higher than the conventional pressure difference of the same specification of medicinal materials), the controller 31 determines that the first filter screen 7 and the second filter screen 8 are pre-clogged or the pore size is not properly matched. It immediately adjusts the rotation angle of the second filter screen 8 to increase the overlap of the filter pores, or controls the first filter screen 7 to fine-tune the angle to disperse the residue, so as to avoid the risk of clogging occurring in advance. If the pressure difference rises slowly during the filtration process, the controller 31 gradually increases the pre-start frequency of the pulse cleaning component to intervene in minor clogging in advance and ensure a stable filtration rate.

[0024] The frying pot 1 is equipped with a pulse assembly for cleaning the first filter screen 7 and the second filter screen 8. The pulse assembly includes an air pump 27, a second connecting pipe 28, an annular pipe 29 and several nozzles 30. The annular pipe 29 is installed inside the frying pot 1, the several nozzles 30 are installed on the annular pipe 29, the air pump 27 is installed on the frying pot 1, and the two ends of the second connecting pipe 28 are connected to the annular pipe 29 and the air pump 27, respectively.

[0025] Finally, the intelligent cleaning and discharge stage begins: During the filtration process, the differential pressure sensor 32 continuously transmits pressure data to the controller 31. When the differential pressure exceeds the preset clogging threshold, the controller 31 no longer relies on a fixed cycle but immediately starts the pulse backflushing cleaning component. The air pump 27 delivers high-pressure gas to the annular pipe 29 through the second connecting pipe 28, and the nozzle 30 sprays a directional high-speed airflow onto the filter screen surface and filter holes. During the cleaning process, the differential pressure sensor 32 monitors the differential pressure changes in real time. When the differential pressure drops back to the normal range, the controller 31 immediately stops cleaning to avoid excessive energy consumption. After filtration, the controller 31 activates the three-way reversing valve 5 to switch to the "drainage liquid" channel, and the clarified medicine liquid is discharged through the discharge pipe 4. After the medicine liquid is discharged, the three-way reversing valve 5 switches to the "slag discharge" channel. At this time, the differential pressure sensor 32 detects the pressure difference between the first filter screen 7 and the second filter screen 8 again. If there is still an abnormal pressure difference, it means that there are stubborn medicine slag residues on the filter screen surface. The controller 31 controls the third drive motor 25 to adjust the filter screen to the maximum pore size and starts the pulse component to output higher pressure gas for secondary targeted cleaning. After confirming that the pressure difference is normal, the second drive motor 22 drives the first filter screen 7 to rotate significantly through the first rotating rod 23, so that the medicine slag attached to the filter screen is removed from the filter screen under the action of the rotation force and falls into the bottom of the decoction tank 1. At the same time, the third drive motor 25 drives the filter screen to rotate to the maximum pore size (the filter holes are completely overlapped), and cooperates with the pulse component to output higher pressure gas (such as 0.6-0.8MPa) for high-intensity cleaning. The medicine slag is completely discharged through the discharge pipe 4 under the dual action of gravity and airflow. This stage solves the problems of incomplete cleaning of traditional filter media and residue of medicine by using intelligent linkage cleaning and discharge logic, which extends the service life of the equipment and ensures a smooth and efficient discharge process.

[0026] In the above embodiment, a controller 31 is installed on the cooking pot 1. The controller 31 is electrically connected to the cooking pot 1, the three-way reversing valve 5, the control valve 10, the liquid concentration sensor 11, the temperature sensor 12, the air pressure sensor 13, the exhaust valve 15, the first drive motor 16, the electric heater 19, the circulation pump 21, the differential pressure sensor 32, the second drive motor 22, the third drive motor 25 and the air pump 27.

[0027] It should be noted that the specific models and specifications of the controller 31, cooking tank 1, three-way reversing valve 5, control valve 10, liquid concentration sensor 11, temperature sensor 12, air pressure sensor 13, exhaust valve 15, first drive motor 16, electric heater 19, circulation pump 21, differential pressure sensor 32, second drive motor 22, third drive motor 25, and air pump 27 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-specification, multi-functional extraction tank integrated device for decocting and filtering medicinal herbs, characterized in that, include: A decoction pot (1) is equipped with a stirring component for stirring medicinal materials. A feeding hood (2) is provided on the decoction pot (1). A sealing cover (3) is connected to the feeding hood (2). A discharge pipe (4) is provided at the lower end of the decoction pot (1). A three-way reversing valve (5) is connected to the discharge pipe (4). The cooking pot (1) is provided with a jacket (6), and the jacket (6) is provided with a temperature control component; The cooking pot (1) is connected to a first filter screen (7) via a rotating assembly. The first filter screen (7) is connected to a second filter screen (8) via an adjusting assembly. Differential pressure sensors (32) are installed on both sides of the first filter screen (7) and the second filter screen (8). The cooking pot (1) is equipped with a pulse assembly for cleaning the first filter screen (7) and the second filter screen (8).

2. The integrated medicinal herb decoction and filtration device with multi-specification multi-functional extraction tanks according to claim 1, characterized in that: The decoction pot (1) is equipped with a water inlet pipe (9), a control valve (10) is installed on the water inlet pipe (9), and liquid concentration sensors (11) are installed at both the upper and lower ends of the decoction pot (1).

3. The integrated medicinal herb decoction and filtration device with multi-specification multi-functional extraction tanks according to claim 2, characterized in that: The frying pot (1) is equipped with a temperature sensor (12) and a pressure sensor (13), and the frying pot (1) is equipped with an exhaust pipe (14) and an exhaust valve (15) is installed on the exhaust pipe (14).

4. The integrated medicinal herb decoction and filtration device with multi-specification multi-functional extraction tanks according to claim 3, characterized in that: The stirring assembly includes a first drive motor (16) and a stirring rack (17). The stirring rack (17) is rotatably connected to the cooking pot (1). The first drive motor (16) is mounted on the cooking pot (1), and the output end of the first drive motor (16) is connected to the extension end of the stirring rack (17) that passes through the cooking pot (1).

5. The integrated medicinal herb decoction and filtration device with multi-specification multi-functional extraction tanks according to claim 4, characterized in that: The stirring rack (17) is equipped with a scraper (18), and the scraper (18) is in contact with the inner wall of the cooking pot (1).

6. The integrated medicinal herb decoction and filtration device with multi-specification multi-functional extraction tanks according to claim 4, characterized in that: The temperature control assembly includes an electric heater (19), two first connecting pipes (20) and a circulation pump (21). The jacket (6) is provided with a circulation pipe (33). The electric heater (19) is installed on the jacket (6). The two ends of the two first connecting pipes (20) are respectively connected to the electric heater (19) and the circulation pipe (33). The circulation pump (21) is connected to one of the first connecting pipes (20).

7. The integrated medicinal herb decoction and filtration device with multi-specification multi-functional extraction tanks according to claim 6, characterized in that: The rotating assembly includes a second drive motor (22) and two first rotating rods (23). The first filter screen (7) is rotatably connected to the cooking pot (1) on both sides through the first rotating rods (23). The second drive motor (22) is installed on the cooking pot (1), and the output end of the second drive motor (22) is connected to the extension end of the first rotating rod (23) through the cooking pot (1).

8. The integrated medicinal herb decoction and filtration device with multi-specification multi-functional extraction tanks according to claim 7, characterized in that: The adjustment assembly includes a sealing frame (24), a third drive motor (25), and a second rotating rod (26). The third drive motor (25) is mounted on the first filter screen (7) through the sealing frame (24). The second filter screen (8) is rotatably connected to the first filter screen (7) through the second rotating rod (26). The output end of the third drive motor (25) is connected to the second rotating rod (26).

9. The integrated medicinal herb decoction and filtration device with multi-specification multi-functional extraction tanks according to claim 8, characterized in that: The pulse assembly includes an air pump (27), a second connecting pipe (28), an annular pipe (29), and a plurality of nozzles (30). The annular pipe (29) is installed inside the cooking pot (1), the plurality of nozzles (30) are installed on the annular pipe (29), the air pump (27) is installed on the cooking pot (1), and the two ends of the second connecting pipe (28) are respectively connected to the annular pipe (29) and the air pump (27).

10. The integrated medicinal herb decoction and filtration device with multi-specification multi-functional extraction tanks according to claim 9, characterized in that: The decoction pot (1) is equipped with a controller (31), which is electrically connected to the decoction pot (1), the three-way reversing valve (5), the control valve (10), the liquid concentration sensor (11), the temperature sensor (12), the air pressure sensor (13), the exhaust valve (15), the first drive motor (16), the electric heater (19), the circulation pump (21), the differential pressure sensor (32), the second drive motor (22), the third drive motor (25), and the air pump (27).

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