Cascade high-temperature drying and opening-closing ring integrated machine

Abstract

The present application relates to a kind of cascade high temperature open-closed loop drying integrated machine, comprising, shell, drying system, compression device, heat exchange device, sensing system, control system.The integrated machine is dried to material by the drying system being set in the body, and temperature and humidity in the body are monitored and adjusted by sensing system and control system, realize the switching of open-closed loop working mode.Drying system is composed of heat exchange box, drying fan;Compression device includes compressor, liquid storage tank and gas-liquid separator;Heat exchange device includes microchannel heat exchanger, first evaporator and second evaporator.Control system determines the drying temperature value when the body starts according to the characteristics and thickness of material, and control system switches and adjusts drying temperature and drying fan speed by open-closed loop working mode to realize the accurate control of temperature and humidity in drying process.The present application has the characteristics of high efficiency, energy saving, environmental protection, uniform drying, and is suitable for the drying treatment of various materials.

Description

Technical Field

[0001] This invention relates to the field of drying technology, and in particular to a cascade high-temperature open-loop and closed-loop drying integrated machine. Background Technology

[0002] Drying equipment is an essential component in both industrial production and daily life. Traditional drying equipment typically employs open-loop or closed-loop systems, which cannot achieve high-temperature drying and precise control, resulting in poor drying performance and high energy consumption.

[0003] Chinese Patent Publication No. CN108489144B ​​discloses a granular material dryer, including a drying tunnel, a lower heating component, an upper heating component, and a heat pump unit. Several lower heating components are located below the drying tunnel and arranged along its length to provide hot air. Several upper heating components are located above the drying tunnel and arranged along its length to provide hot air. One heat pump unit is connected to each lower and upper heating component, supplying heat to each component. Compared with existing technologies, this invention employs a cascaded heat pump cycle to meet the high-temperature requirements of drying. It also uses a multi-connected heat exchanger arrangement and pipe network, eliminating the need for centralized air heating and subsequent duct distribution. Furthermore, the fresh air is preheated by a subcooler, improving circulation efficiency. However, this invention still suffers from problems such as inaccurate control of drying temperature and humidity, unstable drying effect, low drying efficiency, and high energy consumption. Summary of the Invention

[0004] Therefore, the present invention provides a cascade high-temperature open-loop and closed-loop drying integrated machine to overcome the problems of the prior art, such as the inability to accurately control the drying temperature and humidity, unstable drying effect, low drying efficiency, and high energy consumption.

[0005] To achieve the above objectives, the present invention provides a cascade high-temperature open-loop and closed-loop drying integrated machine, comprising,

[0006] The main unit includes a housing, a drying system, a compression device, a heat exchange device, a sensing system, and a control system;

[0007] The outer casing includes a support frame and multiple protective plates, which are respectively inserted into the gaps in the support frame to protect the internal parts of the equipment.

[0008] A drying system is installed at the bottom and side inside the main unit to dry the material. All components of the drying system are connected sequentially by metal pipes.

[0009] A compression unit, located at the bottom of the main unit, is used to compress and store the refrigerant;

[0010] A heat exchange device is installed above the compression device to circulate and exchange heat between the refrigerant and the air.

[0011] A sensing system is installed on the drying system to monitor the temperature and humidity inside the machine and the temperature and humidity of the material.

[0012] A control system, installed on the housing, is used to control the drying system, compression device, heat exchange device, sensing system, and the switching of open-loop and closed-loop operating modes.

[0013] The return air duct is used to connect the heat exchange box and the main unit, and circulates the gas in the heat exchange box back to the main unit during closed-loop drying.

[0014] The control system includes an electrical box door and a display screen. The electrical box door is mounted on the bracket to protect the wires, and the display screen is mounted on the electrical box door to display various parameters.

[0015] The control system determines the drying temperature value when the machine is started based on the material characteristics and thickness.

[0016] Furthermore, the drying system includes,

[0017] A heat exchange box is located on the side of the main unit, and the heat exchange box is equipped with several drying plates for holding and drying materials;

[0018] A drying fan is installed at the bottom of the main unit and connected to the heat exchange box to promote gas flow inside the machine and deliver high-temperature gas to the heat exchange box.

[0019] The compression device includes,

[0020] A compressor is used to compress refrigerant; the compressor is divided into low-temperature compressors and high-temperature compressors.

[0021] A liquid receiver, connected to the compressor inlet, is used to store refrigerant;

[0022] A gas-liquid separator, connected to a liquid storage tank, is used to separate hot vapor from refrigerant.

[0023] Furthermore, the heat exchange device includes,

[0024] A microchannel heat exchanger is connected to the compressor outlet for releasing heat to the outside;

[0025] The first evaporator is connected to the microchannel heat exchanger. During open-loop drying, the first evaporator is smoothly connected to the outside, efficiently absorbing heat from the outside air, driving the refrigerant to vaporize and absorb heat, and fully transferring the heat from the outside air to the refrigerant. Then, it is accurately sent back to the compressor through a four-way valve to achieve heat recovery and utilization. During the closed-loop drying stage, the first evaporator is isolated from the outside and acts as a liquid receiver to temporarily store the refrigerant, effectively reducing interference from the outdoor environment.

[0026] The second evaporator is connected to the first evaporator. During closed-loop drying, the second evaporator acts as a liquid storage tank to receive the liquid refrigerant condensed by the microchannel heat exchanger. During open-loop drying, the second evaporator transports the refrigerant to the first evaporator, connecting the refrigerant circulation process.

[0027] Furthermore, when the sensing system detects that the material humidity value has reached the preset switching humidity range, the control system switches from open-loop working mode to closed-loop working mode. When switching from open-loop working mode to closed-loop working mode, the drying temperature value when switching to closed-loop working mode is determined by analyzing and comparing the drying temperature value when the machine is started with the standard drying temperature range.

[0028] Furthermore, the drying temperature value when switching to closed-loop working mode is determined, including reducing the drying temperature value when switching to closed-loop working mode if the drying temperature value when the dryer is started is lower than the standard drying temperature range.

[0029] If the drying temperature value when the dryer is started is greater than the standard drying temperature range when switching to the closed-loop working mode, the drying temperature value when switching to the closed-loop working mode will be increased.

[0030] If the drying temperature value when the dryer is started is within the standard drying temperature range, the initial standard drying temperature value when switching to closed-loop working mode will be used for switching.

[0031] Furthermore, based on the determined drying temperature value when switching to the closed-loop working mode, the system enters the closed-loop working mode. The control system records the material humidity value at preset time intervals and records the actual humidity change between each two records. After four consecutive records, the average value of the actual humidity change is calculated, and the average value of the actual humidity change is compared and analyzed with the preset standard humidity change range.

[0032] Furthermore, when the average actual humidity change is less than the preset standard humidity change range, it is determined that the current working mode does not meet the drying requirements and the drying temperature value needs to be increased.

[0033] When the average actual humidity change is greater than the preset standard humidity change range, it is determined that the current working mode does not meet the drying requirements and the drying temperature value needs to be reduced.

[0034] When the average actual humidity change is within the preset standard humidity change range, the current working mode is determined to meet the drying requirements, and the drying temperature remains unchanged.

[0035] Furthermore, when the increased temperature value is greater than the switching standard drying temperature range, the maximum value of the switching standard drying temperature range is used as the increased drying temperature value, and the speed of the drying fan is increased at the same time.

[0036] When the reduced temperature value is greater than the switching standard drying temperature range, the minimum value of the switching standard drying temperature range is used to reduce the drying temperature value, and the speed of the drying fan is reduced at the same time.

[0037] Furthermore, when the increased temperature value is greater than the switching standard drying temperature range, the maximum value of the switching standard drying temperature range is taken as the increased drying temperature value, and the speed of the drying fan is increased at the same time to increase the humidity reduction rate. The increased drying fan speed value is determined by multiplying the difference between the increased temperature difference and the maximum value of the standard drying temperature range with the preset increase speed ratio parameter.

[0038] When the reduced temperature value is greater than the switching standard drying temperature range, the minimum value of the switching standard drying temperature range is used to reduce the drying temperature value. At the same time, the speed of the drying fan is reduced to reduce the rate of humidity reduction. The reduced drying fan speed value is determined by multiplying the difference between the reduced temperature difference and the minimum value of the standard drying temperature range with the preset speed reduction ratio parameter.

[0039] Furthermore, when the average humidity of the material stably falls within the standard humidity range, and the monitoring results meet the standard for 5 consecutive times, the sensing system sends a drying completion signal to the control system, and the control system then shuts down each component in an orderly manner.

[0040] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0041] Firstly, in the integrated drying machine of this invention, the compressor starts first upon startup, effectively improving startup efficiency and reducing energy loss during startup. The refrigerant is compressed by the compressor and transported to the microchannel heat exchanger 41. This process not only improves heat exchange efficiency but also expands the operating outlet air temperature range through an advanced cascade system design, enabling operation under ultra-low temperature conditions. This avoids the problems of poor heating efficiency and low outlet air temperature range during drying found in traditional technologies, achieving precise temperature control and rapid and efficient heat conversion. This invention can achieve high-temperature drying from 70℃ to 120℃, meeting the requirements of various radiators.

[0042] Furthermore, the drying system utilizes metal pipes to connect each component sequentially, effectively improving heat transfer efficiency and reducing energy loss. Simultaneously, this structural design simplifies equipment installation and maintenance, lowering operating costs.

[0043] Secondly, the refrigerant releases heat to the outside in the microchannel heat exchanger 41 and then flows into the first evaporator 42. This process design ensures efficient heat utilization and reduces heat waste. Through open-loop operation, the outdoor fan operates at full capacity, causing fresh outdoor air to flow through the first evaporator 42. This innovative design allows the heat carried by the outdoor air to be efficiently transferred to the refrigerant, driving the refrigerant to vaporize and absorb heat, thus completing heat exchange. This not only improves heat exchange efficiency but also achieves efficient heat utilization and reduces energy consumption.

[0044] Furthermore, the heat exchange device in this invention includes a first evaporator and a second evaporator, which can efficiently recover and utilize heat in both open-loop and closed-loop drying modes. In open-loop drying mode, the first evaporator can fully absorb outdoor air heat, achieving efficient heat utilization; while in closed-loop drying mode, the second evaporator acts as a liquid storage tank to temporarily store refrigerant, effectively reducing outdoor environmental interference and ensuring the stability of the drying process.

[0045] Furthermore, the control system in this invention can determine the drying temperature value at machine startup based on material characteristics and thickness, and automatically switch drying modes and adjust drying temperature and fan speed according to changes in material moisture content to ensure optimal drying effect. This intelligent control strategy not only improves drying efficiency but also significantly reduces energy consumption, aligning with the trend of green and environmentally friendly development.

[0046] Furthermore, this invention uses a sensing system to monitor the temperature and humidity inside the machine and the temperature and humidity of the material in real time, ensuring precise control of the drying process. When the average humidity of the material stably falls within the standard humidity range, and the monitoring results meet the standard for five consecutive times, the system can automatically send a drying completion signal and shut down each component in an orderly manner, improving the safety and reliability of the equipment.

[0047] In summary, this invention has the advantages of high drying efficiency, low energy consumption, high degree of automation, good drying quality, simple operation, and long equipment life. It provides a new technical solution for the drying industry and has significant economic and social benefits. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the cross-sectional structure of the cascade high-temperature open-loop and closed-loop drying integrated machine described in this invention;

[0049] Figure 2 This is a schematic diagram of the structure of the cascade high-temperature open-loop and closed-loop drying integrated machine described in this invention;

[0050] Figure 3 This is a side view of the main unit of the cascade high-temperature open-loop and closed-loop drying integrated machine described in this invention.

[0051] Figure 4 This is a schematic diagram of the main structure of the cascade high-temperature open-loop and closed-loop drying integrated machine described in this invention. Detailed Implementation

[0052] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0053] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0054] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0055] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0056] Please see Figures 1-4 As shown, Figure 1 This is a schematic diagram of the cross-sectional structure of the cascade high-temperature open-loop and closed-loop drying integrated machine described in this invention; Figure 2 This is a schematic diagram of the structure of the cascade high-temperature open-loop and closed-loop drying integrated machine described in this invention; Figure 3 This is a side view of the main unit of the cascade high-temperature open-loop and closed-loop drying integrated machine described in this invention. Figure 4 This is a schematic diagram of the main structure of the cascade high-temperature open-loop and closed-loop drying integrated machine described in this invention.

[0057] A cascade high-temperature open-loop and closed-loop integrated dryer dries and dehumidifies materials inside the machine by using air-refrigerant circulation heat exchange and switching between open-loop and closed-loop operating modes.

[0058] The main unit 7 includes a housing 1, a drying system 2, a compression device 3, a heat exchange device 4, a sensing system 5, and a control system 6;

[0059] The outer casing 1 includes a bracket 11 and a plurality of protective plates 12, which are respectively inserted into the gaps in the bracket 11 to protect the internal parts of the equipment.

[0060] The drying system 2 is located at the bottom and side of the main unit 7 and is used to dry the material. All components in the drying system 2 are connected sequentially by metal pipes.

[0061] Compression device 3 is located at the bottom of the main unit 7 and is used to compress and store refrigerant;

[0062] A heat exchange device 4 is disposed above the compression device 3 to circulate and exchange heat between the refrigerant and the air.

[0063] The sensing system 5 is installed on the drying system 2 to monitor the temperature and humidity inside the machine and the temperature and humidity of the material.

[0064] The control system 6 is installed on the outer casing 1 and is used to control the drying system 2, the compression device 3, the heat exchange device 4, the sensing system 5, and the switching of the open-loop and closed-loop working modes.

[0065] Return air duct 8 is used to connect heat exchange box 21 and main unit 7, and circulates the gas in heat exchange box 21 back to main unit 7 during closed-loop drying.

[0066] The control system 6 includes an electrical box door 61 and a display screen 62. The electrical box door 61 is mounted on the bracket 11 to protect the wires, and the display screen 62 is mounted on the electrical box door 61 to display various parameters.

[0067] The control system 6 determines the drying temperature value when the machine is started based on the material characteristics and thickness.

[0068] Furthermore, the drying system 2 includes,

[0069] A heat exchange box 21 is located on the side of the main unit 7. The heat exchange box 21 is provided with several drying plates 211 for holding and drying materials.

[0070] The drying fan 22 is located at the bottom of the main unit 7 and is connected to the heat exchange box 21 to promote the flow of gas inside the machine and deliver high-temperature gas to the heat exchange box 21.

[0071] The compression device 3 includes,

[0072] A compressor for compressing refrigerant, the compressor being divided into a low-temperature compressor 1 and a high-temperature compressor 322;

[0073] The liquid storage tank 32 is connected to the compressor inlet and is used to store refrigerant;

[0074] The gas-liquid separator 33 is connected to the liquid storage tank 32 and is used to separate hot vapor from refrigerant;

[0075] Furthermore, the heat exchange device 4 includes,

[0076] The microchannel heat exchanger 41 is connected to the compressor outlet and is used to release heat to the outside.

[0077] The microchannel heat exchanger 41 adopts a cascade design to expand the range of operating outlet air temperature.

[0078] The first evaporator 42 is connected to the microchannel heat exchanger 41. During open-loop drying, the first evaporator 42 is smoothly connected to the outside, efficiently absorbing heat from the outside air, driving the refrigerant to vaporize and absorb heat, and fully transferring the heat from the outside air to the refrigerant. Then, it is accurately sent back to the compressor through a four-way valve to achieve heat recovery and utilization. During the closed-loop drying stage, the first evaporator 42 is isolated from the outside and becomes a liquid receiver to temporarily store the refrigerant, effectively reducing interference from the outdoor environment.

[0079] The second evaporator 43 is connected to the first evaporator 42. During closed-loop drying, the second evaporator 43 acts as a liquid storage tank 32 to receive the liquid refrigerant condensed by the microchannel heat exchanger 41. During open-loop drying, the second evaporator 43 transports the refrigerant to the first evaporator 42, connecting the refrigerant circulation process.

[0080] Specifically, this invention employs an advanced cascade system, which expands the operating air outlet temperature range through cascade design, enabling operation under ultra-low temperature conditions. This avoids the problems of poor heating efficiency and low air outlet temperature range during drying found in traditional technologies, achieving precise temperature control and rapid and efficient heat conversion. This invention can achieve high-temperature drying from 70℃ to 120℃, meeting the requirements of various radiators.

[0081] Before using the aforementioned cascade high-temperature open-loop and closed-loop drying integrated machine, the operator should first conduct a thorough inspection of the machine. Check whether the support 11 of the outer casing 1 is stable, and whether the protective plate 12 is loose, deformed, or damaged, ensuring that internal parts are properly protected to prevent dust and moisture from affecting equipment operation. Open the electrical box door 61 and check whether the wire connections are tight, whether there is any damage or potential short circuit, and confirm that all sensor systems 5 are functioning normally, ensuring the electrical system is stable and reliable.

[0082] The tea leaves to be dried are placed on a multi-layered, breathable material tray that is evenly spread inside the heat exchange box 21. The thickness of each layer of tea leaves and the initial drying temperature are set with initial standard values ​​based on the type of tea leaves collected.

[0083] The initial standard value range for the thickness of each layer of tea leaves is 2-3 cm, and the initial standard value range for the initial drying temperature is 40-55℃.

[0084] Green tea is rich in various nutrients and aroma compounds. Excessive temperature can easily damage its quality. Therefore, the temperature range used for drying is 40-55℃, which ensures that the tea leaves are effectively dried while maintaining their quality. At the same time, the thickness of each layer of tea leaves is set to 2-3 cm to prevent the aroma from being lost during the drying process if the tea leaves are too thin or the drying process is uneven if the tea leaves are too thick.

[0085] In this embodiment, the initial standard value for the thickness of each layer of tea leaves is set to 2.5 cm, the initial standard value for the initial drying temperature is set to 45℃, the initial humidity value of the tea leaves is 65%, the standard humidity value range of the tea leaves is 5%-8%, the estimated total drying time is about 4-6 hours, and the open-loop drying mode is selected as the starting working mode. After saving the set parameters, the equipment is ready to be started.

[0086] For tea leaf thickness, a standard thickness range is set based on the determined initial standard value.

[0087] The actual thickness of each layer of tea leaves is obtained by the image detection device, and the average thickness is calculated. The calculated average thickness is compared with the standard thickness range to determine the drying temperature value when the drying machine is started.

[0088] If the average actual thickness is less than the standard thickness range, the initial standard value of the initial drying temperature is reduced to obtain the drying temperature value when the drying machine is started.

[0089] If the average actual thickness is greater than the standard thickness range, the initial standard value of the initial drying temperature is increased to obtain the drying temperature value when the drying machine is started.

[0090] If the average actual thickness is within the standard thickness range, then the initial standard value of the initial drying temperature will be used as the drying temperature value when the integrated drying machine is started.

[0091] In this embodiment, the standard thickness range is set to 2.5 ± 0.1 cm.

[0092] The actual thickness of each layer of tea leaves is obtained using an image detection device, and the average thickness is calculated. The calculated average thickness is then compared with the standard thickness range.

[0093] When the initial standard value of the initial drying temperature is reduced, the reduction value is determined by multiplying the difference between the initial standard value of the thickness of each tea layer and the average value of the actual thickness with the preset reduction temperature ratio parameter.

[0094] For example, if the average actual thickness is set to 2.3cm and the temperature ratio parameter is reduced to 10, then the drying temperature when the dryer starts is 45 - (2.5 - 2.3) × 10 = 43℃.

[0095] When increasing the initial standard value of the initial drying temperature, the increase is determined by multiplying the difference between the initial standard value of the thickness of each tea layer and the average value of the actual thickness with a preset increase temperature ratio parameter.

[0096] For example, if the average actual thickness is set to 2.7cm and the temperature ratio parameter is increased to 11, then the drying temperature when the dryer starts is 45 + (2.7 - 2.5) × 11 = 47.2℃.

[0097] Upon startup, the compressor of the integrated drying machine starts first, compressing the refrigerant and delivering it to the microchannel heat exchanger 41. The refrigerant releases heat in the microchannel heat exchanger 41 before flowing into the first evaporator 42. At this point, the open-loop operating mode is selected, and the outdoor fan operates at full capacity, continuously drawing fresh outdoor air through the first evaporator 42. The heat carried by the outdoor air is efficiently transferred to the refrigerant, causing it to vaporize and absorb heat. After heat exchange, the air is precisely returned to the compressor via a four-way valve, initiating the first drying cycle. Simultaneously, the drying fan 22 draws in hot air from the side of the heat exchange box 21, evenly spreading the heated air over the tea leaves and delivering it to the designated areas as needed, comprehensively assisting in the drying of the tea leaves.

[0098] In this invention, the compressor starts first upon startup, effectively improving startup efficiency and reducing energy loss during startup. The refrigerant is compressed and transported to the microchannel heat exchanger 41 by the compressor. This process not only improves heat exchange efficiency but also expands the operating outlet air temperature range through an advanced cascade system design, enabling operation under ultra-low temperature conditions. This avoids the problems of poor heating efficiency and low outlet air temperature range during drying found in traditional technologies, achieving precise temperature control and rapid, efficient heat conversion. This invention can achieve high-temperature drying from 70℃ to 120℃, meeting the requirements of various radiators.

[0099] Secondly, the refrigerant releases heat to the outside in the microchannel heat exchanger 41 and then flows into the first evaporator 42. This process design ensures efficient heat utilization and reduces heat waste. Through open-loop operation, the outdoor fan operates at full capacity, causing fresh outdoor air to flow through the first evaporator 42. This innovative design allows the heat carried by the outdoor air to be efficiently transferred to the refrigerant, driving the refrigerant to vaporize and absorb heat, thus completing heat exchange. This not only improves heat exchange efficiency but also achieves efficient heat utilization and reduces energy consumption.

[0100] Furthermore, the drying fan 22 of this invention draws in hot air forcefully from the side of the heat exchange box 21, allowing the hot air to evenly coat the tea leaves. This design effectively solves the problems caused by uneven heating in the prior art, such as uneven drying and warping of the tea leaves. At the same time, it delivers hot air to the designated area as needed, assisting in the drying of the tea leaves from all directions and improving the drying quality and efficiency.

[0101] Multiple temperature and humidity sensors in the sensing system 5 monitor the temperature and humidity information of key parts inside the machine in real time, and the data is quickly transmitted back to the control system 6. As the drying process progresses, the moisture in the tea leaves slowly evaporates, and the humidity inside the drying machine gradually increases. When the average humidity of the tea leaves is detected to be within the preset switching humidity range of 20%-30%, a working mode switching signal is triggered, switching from open-loop working mode to closed-loop working mode.

[0102] The control system 6 automatically determines the drying temperature value based on the material characteristics and thickness, and automatically switches the drying mode when the material humidity value reaches the preset switching humidity range. This realizes the automated control of the drying process, reduces the difficulty of operation, reduces manual intervention, and improves production efficiency.

[0103] When switching from open-loop operating mode to closed-loop operating mode

[0104] If the drying temperature value when the dryer is started is lower than the standard drying temperature range when switching to the closed-loop working mode, the drying temperature value when switching to the closed-loop working mode will be reduced.

[0105] If the drying temperature value when the dryer is started is greater than the standard drying temperature range when switching to the closed-loop working mode, the drying temperature value when switching to the closed-loop working mode will be increased.

[0106] If the drying temperature value when the dryer is started is within the standard drying temperature range, the initial standard drying temperature value when switching to closed-loop working mode will be used for switching.

[0107] In this embodiment, the temperature corresponding to the compressor's standard power operation is set to 45°C. When the initial standard drying temperature is 45°C in open-loop operation mode, the initial standard drying temperature is 50°C when switching to closed-loop operation mode, and the standard drying temperature range when switching to closed-loop operation mode is 50±5°C.

[0108] Compare the actual drying temperature when the dryer is started with the initial standard drying temperature range when it is switched to closed-loop working mode;

[0109] When the drying temperature value when switching to closed-loop working mode is reduced, the reduction value is determined by multiplying the difference between the actual drying temperature value when the dryer is started and the drying temperature value when switching to closed-loop working mode with a preset reduction ratio parameter.

[0110] For example, if the actual drying temperature when the dryer is started is set to 41℃, and the temperature ratio parameter is reduced to 0.5, then the drying temperature when switching to closed-loop working mode is 50-(45-41)×0.5=48℃.

[0111] When increasing the drying temperature value when switching to closed-loop working mode, the increase value is determined by multiplying the difference between the actual drying temperature value when the dryer is started and the drying temperature value when switching to closed-loop working mode with a preset increase temperature ratio parameter.

[0112] For example, if the actual drying temperature when the dryer is started is set to 44℃, and the temperature ratio parameter is increased to 2, then the drying temperature when switching to closed-loop working mode is 50 + (45-44) × 2 = 52℃.

[0113] During the drying process, the design of the first evaporator 42 and the second evaporator 43 enables flexible switching between open-loop and closed-loop drying modes. In open-loop drying mode, the first evaporator 42 can efficiently absorb heat from the outdoor air, achieving heat recovery and utilization; in closed-loop drying mode, the first evaporator 42 serves as a temporary refrigerant storage tank 32, effectively reducing outdoor environmental interference and ensuring the stability of the drying process.

[0114] The drying machine enters the closed-loop working mode based on the determined drying temperature value when switching to the closed-loop working mode. The control system 6 records the humidity value of the tea leaves every 6 minutes and records the actual humidity change between each two records. The preset standard humidity change is 1% every 6 minutes. After recording four times, the average value of the actual humidity change is calculated and compared with the preset standard humidity change range.

[0115] When the average actual humidity change is less than the preset standard humidity change range, it is determined that the current working mode does not meet the drying requirements and the drying temperature value needs to be increased.

[0116] When the average actual humidity change is greater than the preset standard humidity change range, it is determined that the current working mode does not meet the drying requirements and the drying temperature value needs to be reduced.

[0117] When the average actual humidity change is within the preset standard humidity change range, the current working mode is determined to meet the drying requirements, and the drying temperature remains unchanged.

[0118] In this embodiment, the preset standard humidity change range is 1% ± 0.01%.

[0119] The humidity value of each layer of tea leaves is obtained by a microwave moisture meter, and the average humidity value is calculated. After recording four times, the average value of the actual humidity change is obtained, and the average value of the actual humidity change is compared with the preset standard humidity change range.

[0120] When the drying temperature is reduced, the reduction value is determined by multiplying the difference between the average actual humidity change and the preset standard humidity change with the preset humidity reduction ratio parameter.

[0121] For example, if the drying temperature is set to 50℃ when switching to closed-loop working mode, the average actual humidity change is 1.05%, and the humidity reduction ratio parameter is 20, then the reduced drying temperature is 50 - (1.05% - 1%) × 20 = 49℃.

[0122] When the drying temperature value is increased, the increased drying temperature value is determined by multiplying the difference between the average actual humidity change and the preset standard humidity change with the preset humidity increase ratio parameter.

[0123] For example, if the drying temperature is set to 42℃ when switching to closed-loop working mode, the average actual humidity change is 0.95%, and the humidity ratio parameter is increased by 30, then the increased drying temperature is 50 + (1% - 0.95%) × 30 = 51.5℃.

[0124] When the increased temperature value is greater than the switching standard drying temperature range, the maximum value of the switching standard drying temperature range is taken as the increased drying temperature value. At the same time, the speed of the drying fan 22 is increased to increase the humidity reduction speed. The increased speed of the drying fan 22 is determined by multiplying the difference between the increased temperature difference and the maximum value of the drying standard temperature range with the preset increase speed ratio parameter.

[0125] For example, if the increased temperature is set to 60℃, and the maximum value of the standard drying temperature range of 55℃ is used as the increased drying temperature, and the initial speed of the drying fan 22 is 1000 rpm, and the preset increase speed ratio parameter is 10, then the increased speed of the drying fan 22 is 1000 + (60-55) × 10 = 1050 rpm.

[0126] When the reduced temperature value is greater than the switching standard drying temperature range, the minimum value of the switching standard drying temperature range is used as the reduced drying temperature value, and the speed of the drying fan 22 is reduced at the same time to reduce the rate of humidity reduction. The reduced speed of the drying fan 22 is determined by multiplying the difference between the reduced temperature difference and the minimum value of the standard drying temperature range with the preset speed reduction ratio parameter.

[0127] For example, if the reduced temperature value is set to 35℃, and the minimum value of the standard drying temperature range of 40℃ is used as the reduced drying temperature value, and the initial speed of the drying fan 22 is 1000 rpm, and the preset speed reduction ratio parameter is 20, then the reduced speed of the drying fan 22 is 1000 - (40 - 35) × 10 = 950 rpm.

[0128] After adjusting the drying temperature in the closed-loop working mode according to the above rules, the integrated drying machine maintains this temperature stably for a period of time. As the drying process progresses, the moisture content of the tea leaves continues to decrease, getting closer and closer to the standard humidity range. When the average humidity of the tea leaves enters the 8%-10% range, the microwave moisture detector provides real-time feedback on the humidity data of each layer of tea leaves. When the average humidity of the tea leaves stably falls within the standard humidity range of 5%-8%, and the monitoring results meet the standard for 5 consecutive times, the sensor system 5 sends a drying completion signal to the control system 6. The control system 6 then shuts down all components in an orderly manner. After the equipment stops, the drying chamber door is opened, and the operator carefully removes the dried tea leaves.

[0129] The cascade high-temperature drying technology employed in this invention effectively overcomes the problems of low heating efficiency and high energy consumption in traditional drying equipment. Through the efficient coordination of the compression device 3, the heat exchange device 4, and the air circulation system, heat recovery and utilization are achieved, greatly improving drying efficiency and reducing energy consumption, which aligns with the current trend of energy conservation and emission reduction.

[0130] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0131] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A cascade high-temperature open-close loop drying all-in-one machine, characterized in that, The utility model relates to a drying integrated machine, including, The host computer includes the shell, drying system, compression device, heat exchange device, sensing system and control system; The shell includes the support and multiple protective plates, the protective plate is respectively inserted in the gap in the support, to protect the parts inside the equipment; Drying system, set up in the bottom end and side of the host computer, to dry material, each part in the drying system is sequentially connected through the metal pipe; The drying system includes a heat exchange box, which is arranged on the side of the host computer, and a plurality of drying plates are arranged in the heat exchange box to accommodate and dry the materials; Compression device, set up in the bottom of the host computer, to compress and store refrigerant; Heat exchange device, set up above the compression device, to circulate heat exchange between refrigerant and air; Sensing system, set up on the drying system, to monitor the temperature, humidity and material temperature, humidity in the drying integrated machine; The control system is arranged on the shell and is used for controlling the drying system, the compression device, the heat exchange device, the sensing system and the switching of the open-loop and closed-loop working modes; The return air duct is used for connecting the heat exchange box and the host computer, and the gas in the heat exchange box is circulated and delivered back to the host computer in the closed-loop drying mode; The control system includes an electric box door and a display screen, the electric box door is arranged on the support to protect the electric wire, and the display screen is arranged on the electric box door to display various parameters; The control system determines the drying temperature value when the drying integrated machine starts according to the material characteristics and thickness; When the sensing system detects that the material humidity value reaches the preset switching humidity interval, the control system switches from the open-loop working mode to the closed-loop working mode, and when the switching from the open-loop working mode to the closed-loop working mode is performed, the drying temperature value when the switching to the closed-loop working mode is determined by comparing the drying temperature value when the heat exchange box starts with the switching drying standard temperature interval. The drying temperature value when the switching to the closed-loop working mode is determined, If the drying temperature value when the drying integrated machine starts is less than the switching drying standard temperature interval, the drying temperature value when the switching to the closed-loop working mode is reduced. If the drying temperature value when the drying integrated machine starts is greater than the switching drying standard temperature interval, the drying temperature value when the switching to the closed-loop working mode is increased. If the drying temperature value when the drying integrated machine starts is in the switching drying standard temperature interval, the initial drying temperature initial standard value when the switching to the closed-loop working mode is used for switching. According to the determined drying temperature value when the switching to the closed-loop working mode, the closed-loop working mode is entered, the control system records the material humidity value every interval preset time, records the actual humidity change amount between each two times, continuously records four times, calculates the actual humidity change amount average value, and compares and analyzes the actual humidity change amount average value with the preset standard humidity change amount interval.

2. The cascade high-temperature open-and-closed loop drying all-in-one machine according to claim 1, characterized in that, The drying system includes, The drying fan is arranged at the bottom of the host computer and connected with the heat exchange box, to promote the gas flow in the drying integrated machine and deliver the high-temperature gas into the heat exchange box; The compression device includes, The compressor is used for compressing the refrigerant, and the compressor is divided into a low-temperature compressor and a high-temperature compressor. A liquid storage tank is connected to the compressor inlet to store refrigerant; A gas-liquid separator is connected to the liquid storage tank to separate hot steam from refrigerant.

3. The cascade high-temperature open-and-closed loop drying all-in-one machine according to claim 2, characterized in that, The heat exchange device comprises, A micro-channel heat exchanger is connected to the compressor outlet to release heat to the outside; A first evaporator is connected to the micro-channel heat exchanger. In open-loop drying, the first evaporator is in communication with the outdoor environment to efficiently absorb outdoor air heat and promote refrigerant gasification and heat absorption. After the outdoor air heat is fully transferred to the refrigerant, the refrigerant is accurately sent back to the compressor through a four-way valve to realize heat recycling. In closed-loop drying, the first evaporator is disconnected from the outdoor environment and becomes a liquid storage device to temporarily store refrigerant, effectively reducing outdoor environmental interference. A second evaporator is connected to the first evaporator. In closed-loop drying, the second evaporator acts as a liquid storage tank to receive liquid refrigerant condensed by the micro-channel heat exchanger. In open-loop drying, the second evaporator sends refrigerant to the first evaporator to link the refrigerant circulation process.

4. The cascade high-temperature open-closed loop drying machine according to claim 1, wherein When the average value of the actual humidity change is less than the preset standard humidity change interval, it is determined that the current working mode does not meet the drying requirements, and the drying temperature value needs to be increased; When the average value of the actual humidity change is greater than the preset standard humidity change interval, it is determined that the current working mode does not meet the drying requirements, and the drying temperature value needs to be decreased; When the average value of the actual humidity change is within the preset standard humidity change interval, it is determined that the current working mode meets the drying requirements, and the drying temperature value remains unchanged.

5. The cascade high-temperature open-and-closed loop drying all-in-one machine according to claim 1, characterized in that, When the average value of the material humidity falls within the standard humidity value range and the consecutive 5 monitoring results meet the standard, the sensing system sends a drying completion signal to the control system, and the control system orderly stops each component.

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