A ophiopogon japonicus roller type heat pump drying system

Abstract

A kind of ophiopogon japonicus roller type heat pump drying system, the system includes: inner tube, outer tube, cyclone dust collector, bag type dust collector, evaporator heat exchanger, condenser heat exchanger, expansion valve, compressor, fan, extractable tray, activated carbon dehumidification module;Outer tube side below is connected fan by air pipe a, top is connected cyclone dust collector by air pipe b;Bag type dust collector one end is connected cyclone dust collector by air pipe, the other end is connected activated carbon dehumidification module;Evaporator heat exchanger one end is connected activated carbon dehumidification module, the other end is communicated with outdoor by air pipe;Condenser heat exchanger one end is connected fan by air pipe, the other end is communicated with outdoor by air pipe;Outer tube and inner tube middle layer are provided with ball and transmission device, below extractable tray is set;Inner tube adopts rotary cylindrical design, surface is covered with dense small hole, outer tube uses high-performance insulation material.This experiment makes full use of the waste heat of hot air in drying process, realizes the efficient use of energy.

Description

Technical Field

[0001] This utility model belongs to the field of agricultural processing and drying equipment technology, specifically relating to a high-efficiency Ophiopogon japonicus drying system that combines heat pump technology and waste heat recovery. Background Technology

[0002] As a high-value traditional Chinese medicine, the drying process of Ophiopogon japonicus directly affects the quality and efficacy of the finished product. Traditional Ophiopogon japonicus drying equipment typically uses a fixed tray or single-layer drum design, resulting in uneven hot air distribution and inconsistent heating of the material. Sugar-containing dust generated during the drying process easily adheres to the inner wall of the equipment, reducing heat exchange efficiency. Conventional dust removal methods are insufficient to completely remove fine particulate matter, and in practice, the generated dust also has a significant impact on workers' health. With the rapid development of the traditional Chinese medicine and agricultural product processing industry, higher demands are being placed on the efficiency, energy saving, and environmental friendliness of drying equipment.

[0003] In recent years, heat pump drying technology has been introduced into the field of medicinal material processing due to its high energy efficiency and strong environmental protection. However, the existing heat pump drying system does not recover enough waste heat from the humid waste gas, resulting in low heat utilization rate.

[0004] Traditional drying equipment often suffers from chaotic hot air circulation paths due to single-layer cylinders or fixed tray designs, resulting in uneven heating of Ophiopogon japonicus. Sugary dust generated during the drying process easily adheres to the inner walls of the equipment or clogs air ducts, further reducing heat exchange efficiency, and single dust removal devices are insufficient to completely remove fine particulate matter. Conventional heat pump systems do not fully recover waste heat from the humid exhaust gas, leading to low overall energy efficiency. Patent CN202021588819.1 discloses an Ophiopogon japonicus drying device, which employs a two-stage drying process, including a drying mechanism, a hot air furnace, a first fan, a second fan, and a power mechanism. The drying mechanism includes a first drying component and a second drying component, both of which include air chamber seats. The device includes a first drum and a second drying assembly, both of which are mounted on an air chamber seat. Both drums consist of a steel plate layer and a wire mesh layer, and each has a roasting plate and a discharge plate inside. The steel plate layer has through holes. All components are connected via air supply pipes, which are equipped with ventilation switches. The air supply pipe connected to the first fan also has a temperature control valve. A power mechanism provides rotational power to the three drums. However, this design still has significant drawbacks: First, although the device achieves basic temperature control through the temperature control valve, it lacks any waste heat recovery module, resulting in no significant increase in the system's COP value. Second, no dust collector is installed, causing dust to easily adhere to the inner wall of the equipment. Dust accumulation reduces the hot air velocity, leading to significant heat loss.

[0005] To address the aforementioned issues, this invention proposes an innovative Ophiopogon japonicus drum-type heat pump drying system. By optimizing the hot air drying effect through the relative rotation of the inner and outer drums, it combines cyclone dust removal and bag dust removal with multi-stage filtration to remove dust, and utilizes a heat pump system to achieve efficient waste heat recovery. This effectively solves the core pain points of uneven hot air, inefficient dust removal, and excessive energy consumption in traditional technologies, significantly improving the drying quality of Ophiopogon japonicus and the overall energy efficiency of the system. Summary of the Invention

[0006] The basic idea of ​​this utility model is as follows: through the coordinated design of inner and outer cylinders, the rotation of the inner cylinder continuously tumbles the Ophiopogon japonicus material, while the outer cylinder insulates and guides hot air to penetrate evenly through the small holes of the inner cylinder, improving the uniformity of drying; during the drying process of Ophiopogon japonicus, impurities and sugar-containing dust will be generated due to the rotation of the drum and the loss of moisture, and large-volume impurities will be discharged through the holes during the rotation; a cyclone dust collector and a bag dust collector are set up to absorb the small-volume sugar-containing dust mixed in the recycled air step by step, avoiding the sugar-containing dust from adhering to the drum or equipment and increasing unnecessary heat exchange resistance; an activated carbon dehumidification module is set up to prevent frost from forming on the surface of the evaporator heat exchanger, which would reduce heat exchange efficiency and increase energy consumption.

[0007] In the heat pump drying cycle, the condenser heat exchanger generates heat by releasing heat through refrigerant condensation, while the evaporator heat exchanger exchanges heat by absorbing heat through refrigerant evaporation. The system introduces recovered hot air into the evaporator heat exchanger for heat exchange, accelerating the evaporation rate of the refrigerant within the evaporator heat exchanger, thereby improving the overall energy efficiency of the system. The heat released by the condenser heat exchanger is used to heat the fresh air introduced from the outside, maintaining a suitable drying temperature and realizing the function of waste heat recovery.

[0008] The technical solution adopted in this utility model is as follows: a drum-type heat pump drying system for Ophiopogon japonicus, comprising an inner cylinder, an outer cylinder, a cyclone dust collector, a bag filter, an evaporator heat exchanger, a condenser heat exchanger, an expansion valve, a compressor, a fan, a removable tray, and an activated carbon dehumidification module; since hot air has a low density and rises easily, hot air is introduced into the outer cylinder via a fan connected to the lower side through duct a, and the upper side is connected to the cyclone dust collector via duct b; the cyclone dust collector is connected to the bag filter via duct; the bag filter is connected to the activated carbon dehumidification module via duct; the activated carbon dehumidification module is connected to the evaporator heat exchanger via duct; the evaporator heat exchanger is connected to the compressor, condenser heat exchanger, and expansion valve in sequence through refrigerant pipelines to form a heating circulation loop; one end of the condenser heat exchanger is connected to the fan via duct, and the other end is connected to the external environment via duct, introducing fresh air into the heating channel.

[0009] The inner cylinder is a rotatable cylindrical structure with densely distributed small holes on its surface. It is connected to the outer cylinder through ball bearings at both ends and a transmission device, and rotates at a constant speed under the drive of the transmission device. The outer cylinder is made of high-performance heat-insulating material and forms an annular hot air channel with the inner cylinder to ensure uniform distribution of hot air. Both the outer and inner cylinders are equipped with openable heat-insulating doors on both sides for easy loading and unloading of materials and daily maintenance of the equipment. The bottom of the outer cylinder is equipped with a pull-out tray for collecting impurities and debris that fall during the drying process.

[0010] During operation, hot air, driven by a fan, enters from the lower side of the outer cylinder through duct a, and undergoes thorough heat exchange with the Ophiopogon japonicus material through small holes in the inner cylinder. The humid, hot air exits from the top of the outer cylinder through duct b, first entering a cyclone dust collector for primary dust removal, removing larger dust particles, and then entering a bag filter for deep filtration to remove fine dust. The purified air then enters an activated carbon dehumidification module for dehumidification. The dehumidified hot air enters an evaporator heat exchanger for heat exchange, and the air after heat exchange is directly discharged outdoors. Outdoor fresh air is sent to a condenser heat exchanger for heating, and then, driven by a fan, is sent into the outer cylinder to maintain the drying temperature. Throughout the drying process, the inner cylinder rotates at a constant speed driven by a transmission device, constantly turning the Ophiopogon japonicus material to ensure even heating. The removable tray can be periodically removed for cleaning, keeping the system clean.

[0011] The advantages of this invention are: utilizing heat pump technology for drying significantly improves energy efficiency, resulting in energy conservation and environmental protection; the coordinated design of inner and outer cylinders optimizes the hot air distribution path, ensuring uniform heating of the Ophiopogon japonicus material and avoiding localized overheating or insufficient drying; the multi-stage filtration system combining cyclone dust collectors and bag filters effectively removes dust generated during the drying process, preventing dust adhesion to equipment or blockage of air ducts; an activated carbon dehumidification module prevents frost formation on the evaporator heat exchanger, maintaining efficient system operation; and a closed-loop heat pump cycle enables efficient waste heat recovery, further enhancing the system's performance. It boasts high energy efficiency; utilizing recovered hot air for heat exchange with the evaporator heat exchanger accelerates the evaporation rate of the coolant in the evaporator heat exchanger, improving the operating efficiency of the heat pump; the outer cylinder uses high-performance insulation material to reduce heat loss and improve drying efficiency; openable insulated doors are installed on both sides of the inner and outer cylinders for easy material loading and unloading and equipment maintenance; the pull-out tray design facilitates the collection of impurities that fall during the drying process, reducing manual cleaning workload; using this Ophiopogon japonicus drum-type heat pump for drying is not limited by geographical location, has high drying efficiency, is easy to operate, and has good safety performance, making it highly practical and widely applicable. Attached Figure Description

[0012] This instruction manual includes two accompanying drawings: Figure 1 This is a schematic diagram of a rotary drum heat pump dryer for Ophiopogon japonicus. Figure 2This is a diagram of a drum assembly. The diagram shows: 1. Inner drum, 2. Outer drum, 3. Ball bearings, 4. Transmission device, 5. Small hole, 6. Fan, 7. Cyclone dust collector, 8. Bag filter, 9. Evaporator heat exchanger, 10. Condenser heat exchanger, 11. Compressor, 12. Expansion valve, 13. Pull-out tray, 14. Insulated door, 15. Duct a, 16. Duct b, 17. Activated carbon dehumidification module. Detailed Implementation

[0013] A rotary drum heat pump drying system for Ophiopogon japonicus, characterized in that the drying system comprises: an annular hot air channel formed by an inner cylinder 1 and an outer cylinder 2 connected to a transmission device 4 via ball bearings 3; the surface of the inner cylinder 1 is covered with dense small holes 5; the outer cylinder 2 is made of high-performance heat insulation material; a fan 6 is connected to the lower side of the outer cylinder 2 via a duct a15, and a cyclone dust collector 7 is connected to the upper side via a duct b16; the cyclone dust collector 7 is connected to a bag filter 8, the other end of the bag filter 8 is connected to an activated carbon dehumidification module 17, the other end of the activated carbon dehumidification module 17 is connected to an evaporator heat exchanger 9, and the other end of the evaporator heat exchanger 9 is connected to the outside via a duct; one end of the condenser heat exchanger 10 is connected to the fan 6 via a duct, and the other end is connected to the outside via a duct; the inner cylinder 1 is installed inside the outer cylinder 2, the ball bearings 3 and the transmission device 4 are arranged in the middle layer, and a pull-out tray 13 is arranged at the bottom; openable heat-insulating doors 14 are arranged on both sides of the inner cylinder 1 and the outer cylinder 2.

[0014] The inner cylinder 1 rotates at a uniform speed under the drive of the transmission device 4. Its surface holes 5 allow hot air to penetrate and dry the Ophiopogon japonicus, while also allowing debris and impurities to fall naturally to the bottom pull-out tray 13. The outer cylinder 2 uses insulation material to reduce heat loss, and the insulated doors 14 on both sides facilitate loading and unloading materials. The humid, hot exhaust gas containing dust and impurities enters the cyclone dust collector 7 through the air duct b16 at the top of the outer cylinder 2 to remove large particles. Subsequently, it passes through a bag filter 8 for deep filtration of fine dust, preventing sugar-containing dust from adhering to the surface of the evaporator heat exchanger 9 or clogging the air ducts and holes 5, thus reducing heat exchange resistance. The purified humid, hot exhaust gas... Airflow enters the activated carbon dehumidification module 17 for dehumidification, preventing frost formation on the evaporator heat exchanger 9 and maintaining the efficient operation of the heat pump system. The dehumidified hot air is sent to the evaporator heat exchanger 9 to release residual heat, improving the evaporation efficiency of the evaporator heat exchanger 9 and thus improving the overall heat generation efficiency of the heat pump unit. The fresh air introduced from the outside is heated by the condenser heat exchanger 10 and then driven by the fan 6 to be sent to the outer cylinder through the air duct a15 to participate in circulation, maintaining a stable drying environment. The pull-out tray 13 is used to collect impurities that fall during the drying process, facilitating the unified disposal of waste and reducing the workload of workers.

[0015] Further measures: Install photovoltaic panels on the roof of the Ophiopogon japonicus drying plant, which can generate electricity for self-use and preheat the air.

[0016] Further measures: The outer cylinder is lined with phase change material, and the temperature fluctuation inside the drying chamber is reduced when the refrigeration equipment is running intermittently.

[0017] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention. The actual structure is not limited to this. Therefore, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the spirit of the present invention, such design should fall within the protection scope of the present invention.

Claims

1. A Ophiopogon japonicus tumble heat pump drying system, characterized in that, The drying system includes: an inner cylinder, an outer cylinder, a cyclone dust collector, a bag filter, an evaporator heat exchanger, a condenser heat exchanger, an expansion valve, a compressor, a fan, a pull-out tray, and an activated carbon dehumidification module. The outer cylinder is connected to the fan via duct a at its lower side and to the cyclone dust collector via duct b at its upper side. One end of the bag filter is connected to the cyclone dust collector via duct, and the other end is connected to the activated carbon dehumidification module. One end of the evaporator heat exchanger is connected to the activated carbon dehumidification module via duct, and the other end is connected to the outside via duct. One end of the condenser heat exchanger is connected to the fan via duct, and the other end is connected to the outside via duct. A ball bearing and transmission device are installed in the middle layer between the outer and inner cylinders, and a pull-out tray is installed below.

2. The Adenosma drum-type heat pump drying system according to claim 1, characterized in that: The inner cylinder adopts a rotating cylindrical design with densely packed small holes on its surface.

3. The Ophiopogon japonicus drum-type heat pump drying system according to claim 1, characterized in that: The inner and outer cylinders are equipped with openable insulated doors on both sides.

4. The Ophiopogon japonicus drum-type heat pump drying system according to claim 1, characterized in that: The activated carbon dehumidification module can be disassembled and replaced.

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