Energy-saving precise air source heat pump drying machine based on temperature and humidity control

Abstract

The invention relates to the technical field of drying equipment, in particular to an energy-saving precise air source heat pump drying machine based on temperature and humidity control, which comprises a drying chamber, an air source heat pump system, an external steam generator, an air outlet pipeline system and an online weighing system. The steam generator accurately conveys steam through an electromagnetic valve and is matched with a high-precision temperature and humidity sensor to realize stable regulation and control of a dry environment; the COP of the air source heat pump system is larger than 3, environment heat is efficiently sucked for heat supply, and an air outlet pipeline directionally recovers wet air latent heat for reuse; and an online weighing system is combined with a drying water loss curve to accurately judge a drying end point. The problems of material crusting and uneven drying are effectively inhibited, the drying quality is greatly improved, the energy consumption is remarkably reduced, meanwhile, the beneficial effects of being convenient to operate and flexible to move are achieved, the multi-scene requirements of industrial production, agricultural product processing and the like are met, and the energy utilization rate and the production efficiency are synchronously improved.

Description

Technical Field

[0001] This invention relates to the field of drying equipment technology, and more specifically, to an energy-saving and precise air-source heat pump dryer based on temperature and humidity control. Background Technology

[0002] In industrial production and agricultural product processing, drying is a crucial process for ensuring material quality and extending shelf life, especially suitable for perishable materials such as vegetables with high moisture content (90%-95% for leafy vegetables and 85%-95% for solanaceous vegetables). my country's post-harvest vegetable loss rate is as high as 30%, making drying an important means of reducing losses, increasing efficiency, and promoting exports. In 2021, my country's dehydrated vegetable exports accounted for approximately 50% of international trade.

[0003] Current mainstream hot air drying equipment suffers from several shortcomings: insufficient precision in temperature and humidity control leads to uneven drying and crust formation, severely impacting material quality; low energy efficiency results in significant heat loss with exhaust gases, failing to meet energy conservation requirements; and reliance on experience to determine the drying endpoint often leads to over-drying or under-drying. Furthermore, traditional humidification methods (ultrasonic atomizers, water curtains) suffer from insufficient pressure, scaling, or narrow adjustable ranges, further hindering drying effectiveness. Therefore, developing a drying device that can precisely control temperature and humidity, is highly energy-efficient, and accurately determine the drying endpoint has become an urgent industry need. Summary of the Invention

[0004] In view of this, the present invention addresses the shortcomings of the prior art by proposing an energy-saving and precise air source heat pump dryer based on temperature and humidity control, aiming to solve at least one of the problems mentioned in the background art.

[0005] This invention provides an energy-saving and precise air source heat pump dryer based on temperature and humidity control, comprising: a drying chamber, an air source heat pump system, an external steam generator, an air outlet duct system, an online weighing system, a circulating fan, an electric auxiliary heating chamber, and a touch screen; the steam generator is connected to the drying chamber through a steam pipe and supplies steam to the drying chamber via a solenoid valve; The air source heat pump system extracts heat from the environment and supplies heat to the drying chamber via a compressor and condenser. The air outlet duct system utilizes the principle of cold air sinking and hot air rising to discharge low-temperature humid air, and combines it with an evaporator for waste heat recovery. The online weighing system combines data collected by temperature and humidity sensors and determines the drying endpoint based on the drying loss curve. The circulating fan provides power for hot air circulation.

[0006] In some embodiments, the steam generator is equipped with a water tank, a manual valve, a power supply, and a pressure display. The purified water added to the water tank has a conductivity of ≤10μS / cm. After the steam generator is started, steam delivery is initiated through the manual valve when the preset pressure of 0.4MPa is reached. The solenoid valve is installed on the connection path between the steam pipe and the drying chamber, and the steam delivered by the steam generator is used to balance the evaporation rate of surface moisture and the internal moisture migration rate of the material.

[0007] In some embodiments, the coefficient of performance (COP) of the air source heat pump system is greater than 3, and includes an evaporator, a gas-liquid separator, a four-way valve, a compressor, a liquid receiver, a condenser, an expansion valve, a filter, and an evaporator fan. Each component is connected in sequence through pipelines to form a circulation loop. The gas-liquid separator is located between the evaporator and the compressor to separate the liquid components in the refrigerant, and the filter is connected in series in the pipeline to filter impurities in the refrigerant.

[0008] In some embodiments, the air outlet duct system includes a humid air inlet disposed at the bottom of the drying chamber, an air outlet duct with a built-in centrifugal fan and a dehumidification fan, a dehumidification outlet, and a heat collection chamber; The heat collection chamber houses the evaporator and the evaporation fan. The exhaust port faces the evaporator fins. Low-temperature, humid air is blown toward the fins by the exhaust fan, and the evaporator captures the latent heat contained in the humid air.

[0009] In some embodiments, the online weighing system includes a weighing sensor, a weighing beam, a material tray, a weighing base, and a material support. The weighing base is located at the bottom of the drying chamber, the weighing sensor is installed above the weighing base, the weighing beam supports the material tray and is connected to the weighing sensor, and the material support is fixed inside the drying chamber to support the material tray. The weighing sensor monitors changes in material weight in real time.

[0010] In some embodiments, a temperature and humidity sensor is provided on the left side wall of the drying chamber. The temperature and humidity sensor has a measurement range of 0-100℃ for temperature and 10%-90%RH for humidity, and a measurement accuracy of ±1℃ for temperature and ±2%RH for humidity. The drying chamber is also equipped with an air inlet plate, an air outlet plate, and a static pressure box. The static pressure box is located above the air inlet plate. After the air is heated by the electric auxiliary heating chamber, it mixes with the steam and enters the drying chamber evenly through the static pressure box and the air inlet plate. The dried air is discharged to the air outlet duct through the air outlet plate.

[0011] In some embodiments, an electric auxiliary heating wire is provided inside the electric auxiliary heating chamber. The electric auxiliary heating wire is automatically activated within 10-15 minutes during the initial startup of the equipment or when the ambient temperature is ≤10℃, to provide secondary heating for the air entering the drying chamber. The circulating fan is located between the heat pump heating chamber and the electric auxiliary heating chamber to provide power for hot air circulation.

[0012] In some embodiments, the air source heat pump system uses an environmentally friendly refrigerant, and the four-way valve is installed on the pipeline between the gas-liquid separator and the compressor for switching the refrigerant flow direction.

[0013] In some embodiments, the dryer is equipped with pulleys at the bottom; The touch screen is used to set segmented drying parameters, display temperature and humidity data and material weight data in real time, and has an audible and visual alarm function for abnormal parameters.

[0014] In some embodiments, the opening ratio of the air outlet plate is ≥60%, and the air inlet plate adopts a multi-hole flow equalization design; The dehumidification fan works independently of the centrifugal fan, and the dehumidification fan is only activated when the humidity in the drying chamber is higher than the target value.

[0015] Compared with existing technologies, the advantages of this invention are as follows: the external steam generator accurately delivers steam through an electromagnetic valve, effectively balancing the evaporation rate of surface moisture and the internal migration rate of the material, thus completely suppressing crust formation; the temperature and humidity sensor provides high-precision real-time feedback of ±1℃ and ±2%RH, combined with segmented parameter settings, ensuring a stable and controllable drying environment and avoiding uneven drying of materials; the air source heat pump system has a COP > 3, efficiently absorbing ambient heat through refrigerant circulation, with energy consumption only 1 / 3 to 1 / 4 of that of traditional heat sources; the exhaust duct system directionally guides humid air through the evaporator, recovering latent heat for reuse, and combined with the intelligent start-stop design of electric auxiliary heating, further reducing energy loss; the online weighing system monitors material weight changes in real time, and combined with temperature and humidity data and drying loss curves, avoids over-drying or under-drying; the touch screen integrates parameter setting, data display, and abnormal alarm functions, and the equipment's caster design balances ease of operation and mobility.

[0016] The above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.

[0017] Other features and aspects of this disclosure will become clearer from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a front structural cross-sectional view of an energy-saving precision air source heat pump dryer based on temperature and humidity control provided in an embodiment of the present invention. Figure 2 A schematic diagram of the structure of an energy-saving precision air source heat pump dryer based on temperature and humidity control provided in an embodiment of the present invention; Figure 3 A schematic diagram of the structure of an energy-saving precision air source heat pump dryer based on temperature and humidity control provided in an embodiment of the present invention; Figure 4 A schematic diagram of the structure of an energy-saving precision air source heat pump dryer based on temperature and humidity control provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of an energy-saving precision air source heat pump dryer based on temperature and humidity control, provided as an embodiment of the present invention.

[0020] The components include: 1. Heat pump heating chamber; 2. Circulating fan; 3. Electric auxiliary heating chamber; 4. Static pressure box; 5. Air inlet plate; 6. Drying chamber; 7. Air outlet plate; 9. Heat collection chamber; 10. Solenoid valve; 11. Steam pipe; 12. Steam generator; 13. Touch screen; 14. Gas-liquid separator; 15. Expansion valve; 16. Four-way valve; 17. Compressor; 18. Liquid storage tank; 19. Condenser; 20. Electric auxiliary heating wire; 21. Temperature and humidity sensor; 22. Material support; 23. Material tray; 24. Weighing sensor; 26. Weighing base; 27. Air outlet duct; 28. Humid air inlet; 29. ​​Centrifugal fan; 30. Exhaust outlet; 31. Evaporator; 32. Evaporating fan; 33. Manual valve; 34. Water tank; 35. Power supply; 36. Pressure display. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this application, it should be noted that, unless otherwise expressly 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] See Figure 1-5 As shown, an energy-saving precision air source heat pump dryer based on temperature and humidity control according to an embodiment of this application includes: The system includes a drying chamber 6, an air source heat pump system, a steam generator 12, an air outlet duct system, an online weighing system, a circulating fan 2, an electric auxiliary heating chamber 3, and a touch screen 13. The steam generator 12 is connected to the drying chamber 6 through a steam pipe 11 and supplies steam to the drying chamber 6 through a solenoid valve 10. The air source heat pump system extracts heat from the environment and supplies heat to the drying chamber via compressor 17 and condenser 19. The air outlet duct system utilizes the principle of cold air sinking and hot air rising to discharge low-temperature humid air, and combines it with the evaporator 31 for waste heat recovery. The online weighing system combines the data collected by the temperature and humidity sensor 21 and determines the drying endpoint based on the drying loss curve. The circulating fan 2 provides power for hot air circulation.

[0026] In some specific embodiments, the steam generator 12 is equipped with a water tank 34, a manual valve 33, a power supply 35, and a pressure display 36. The purified water added to the water tank 34 has a conductivity of ≤10μS / cm. When the steam generator 12 is started and needs to reach a preset pressure of 0.4MPa, the steam delivery is opened through the manual valve 33. The solenoid valve 10 is installed on the connection path between the steam pipe 11 and the drying chamber 6. The steam delivered by the steam generator 12 is used to balance the evaporation rate of surface moisture and the internal moisture migration rate of the material.

[0027] In some specific embodiments, the coefficient of performance (COP) of the air source heat pump system is greater than 3, including the evaporator 31, gas-liquid separator 14, four-way valve 16, compressor 17, liquid storage tank 18, condenser 19, expansion valve 15, filter and evaporator fan 32, and each component is connected in sequence through pipelines to form a circulation loop; The gas-liquid separator 14 is disposed between the evaporator 31 and the compressor 17 and is used to separate the liquid components in the refrigerant. The filter is connected in series in the pipeline and is used to filter impurities in the refrigerant.

[0028] In some specific embodiments, the air outlet duct system includes a humid air inlet 28 disposed at the bottom of the drying chamber 6, an air outlet duct 27 with a built-in centrifugal fan and a dehumidification fan, a dehumidification outlet 30, and a heat collection chamber 9; The heat collection chamber 9 houses the evaporator 31 and the evaporation fan 32. The exhaust port 30 faces the fins of the evaporator 31. Low-temperature humid air is blown toward the fins by the exhaust fan, and the evaporator 31 captures the latent heat contained in the humid air.

[0029] In some specific embodiments, the online weighing system includes a weighing sensor 24, a weighing beam, a material tray 23, a weighing base 26, and a material support 22; The weighing base 26 is disposed at the bottom of the drying chamber 6, the weighing sensor 24 is installed above the weighing base 26, the weighing beam supports the material tray 23 and is connected to the weighing sensor 24, and the material support 22 is fixed inside the drying chamber 6 to support the material tray 23. The weighing sensor 24 monitors the changes in material weight in real time.

[0030] In some specific embodiments, the temperature and humidity sensor 21 is provided on the left side wall of the drying chamber 6. The temperature and humidity sensor 21 has a measurement range of 0-100℃ for temperature and 10%-90%RH for humidity, and a measurement accuracy of ±1℃ for temperature and ±2%RH for humidity. The drying chamber 6 is also equipped with an air inlet plate 5, an air outlet plate 7, and a static pressure box 4. The static pressure box 4 is located above the air inlet plate 5. After the air heated by the electric auxiliary heating chamber 3 is mixed with steam, it enters the drying chamber 6 evenly through the static pressure box 4 and the air inlet plate 5. The dried air is discharged to the air outlet duct 27 through the air outlet plate 7.

[0031] In some specific embodiments, an electric auxiliary heating wire 20 is provided inside the electric auxiliary heating chamber 3. The electric auxiliary heating wire 20 is automatically activated within 10-15 minutes during the initial startup of the equipment or when the ambient temperature is ≤10℃, to perform secondary heating on the air entering the drying chamber 6. The circulating fan 2 is located between the heat pump heating chamber 1 and the electric auxiliary heating chamber 3, providing power for hot air circulation.

[0032] In some specific embodiments, the air source heat pump system uses an environmentally friendly refrigerant, and the four-way valve 16 is installed on the pipeline between the gas-liquid separator 14 and the compressor 17 for switching the flow direction of the refrigerant.

[0033] In some specific embodiments, the dryer is equipped with pulleys at the bottom; The touch screen 13 is used to set segmented drying parameters, display temperature and humidity data and material weight data in real time, and has an audible and visual alarm function for abnormal parameters.

[0034] In some specific embodiments, the opening ratio of the air outlet plate 7 is ≥60%, and the air inlet plate 5 adopts a multi-hole flow equalization design; The dehumidification fan works independently of the centrifugal fan 29, and the dehumidification fan is only activated when the humidity in the drying chamber is higher than the target value.

[0035] It should be understood that the following preparations must be completed before starting the equipment: add pure water with a conductivity of ≤10μS / cm to the water tank 34 of the steam generator 12 to avoid scale clogging the pipes and affecting the humidification stability; connect the power supply 35 of the steam generator 12, and observe the pressure display 36 in real time after starting the equipment. When the pressure rises to the preset 0.4MPa, manually open the valve 33 to allow steam to enter the steam pipe 11 to stand by. The operator sets the segmented drying parameters via the touch screen 13, including the target temperature (measurement accuracy ±1℃), target humidity (measurement accuracy ±2%RH), and corresponding duration for each stage. The equipment then enters the preheating stage. The temperature and humidity sensor 21 on the left side wall of the drying chamber 6 collects indoor environmental data in real time and feeds it back to the control system. Once the environmental parameters reach the initial set values, the material to be dried is evenly spread on the material tray 23 (laying thickness ≤5cm, avoid stacking). The material tray 23 is then placed on the material support 22 inside the drying chamber 6. The bottom of the material tray 23 is supported by a weighing beam, which is connected to the weighing sensor 24 above the weighing base 26 at the bottom of the drying chamber 6, preparing for subsequent weight monitoring.

[0036] The core operating stage is the precise control of heating and temperature / humidity: After the air source heat pump system starts, the environmentally friendly refrigerant inside absorbs ambient heat in the evaporator 31, vaporizing from liquid to gas. The gaseous refrigerant flows through the pipeline to the gas-liquid separator 14, separating the entrained liquid components to prevent liquid refrigerant from entering the compressor 17 and causing liquid slugging damage. Then, it enters the compressor 17 through the four-way valve 16 (used to switch the refrigerant flow direction to ensure stable system circulation). The compressor 17 compresses the gaseous refrigerant to a high-temperature and high-pressure state (temperature ≥80℃, pressure ≥2.0MPa). The high-temperature and high-pressure refrigerant flows into the liquid storage tank 18 for temporary storage, and then enters the condenser 19 for heat exchange. The refrigerant condenses and releases heat to transfer heat to the dry indoor air, realizing the heating function. The system has a coefficient of performance (COP) > 3, requiring only a small amount of electricity to generate 3-4 times the calorific value of electricity, with significant energy-saving advantages. At the same time, the filter connected in series in the pipeline can effectively filter impurities in the refrigerant and avoid component wear. During this process, the circulating fan 2 is positioned between the heat pump heating chamber 1 and the electric auxiliary heating chamber 3, providing continuous power for hot air circulation and pushing the air heated by the condenser 19 to the electric auxiliary heating chamber 3. The electric auxiliary heating wire 20 in the electric auxiliary heating chamber 3 intelligently starts and stops according to the operating conditions. When the equipment starts up for 10-15 minutes (when the condenser 19 has not reached a stable heat exchange temperature) or the ambient temperature is ≤10℃ (when the heat absorption efficiency of the evaporator 31 decreases), the electric auxiliary heating wire 20 automatically starts to reheat the air to compensate for the insufficient heat. The heated air continues to be transported forward. If the temperature and humidity sensor 21 indicates that the humidity in the drying chamber 6 has not reached the set value, the solenoid valve 10 responds quickly (response time ≤0.5s) and opens. The steam in the steam pipe 11 is precisely injected and fully mixed with the hot air. After the mixed airflow is evenly distributed through the static pressure box 4, it enters the drying chamber 6 evenly through the multi-hole air inlet plate 5, realizing precise control of the humidity in the drying chamber 6, effectively balancing the evaporation rate of surface moisture and the internal migration rate of the material, and suppressing the crusting phenomenon of the material from the root.

[0037] The dehumidification and waste heat recovery processes are carried out simultaneously to achieve efficient energy utilization: Based on the physical principle that cold air sinks and hot air rises, the low-temperature humid air generated after drying materials in the drying chamber 6 enters the air outlet duct 27 from the humid air inlet 28 at the bottom of the drying chamber 6; the air outlet duct 27 has a built-in centrifugal fan 29 and a dehumidification fan, which work independently. The dehumidification fan is only activated when the temperature and humidity sensor 21 detects that the humidity in the drying chamber 6 is higher than the target value, and the humid air is discharged through the dehumidification port 30; the dehumidification port 30 is specifically oriented towards the fins of the evaporator 31 in the heat collection chamber 9. The humid air is blown directionally towards the fins under the drive of the dehumidification fan. The evaporator 31 captures the latent heat contained in the humid air (i.e., the heat released by the condensation of water vapor) and transfers this heat to the internal refrigerant, which re-participates in the circulation heat exchange of the air source heat pump system, realizing the recovery and reuse of waste heat. Tests have shown that this can reduce equipment energy consumption by 15%-20%. The evaporation fan 32 in the heat collection chamber 9 works simultaneously to improve the heat exchange efficiency of the evaporator 31. The dried air is further directed to the air outlet duct 27 via the air outlet plate 7 (with an opening rate of ≥60% to ensure smooth airflow) to complete the hot air circulation.

[0038] The drying endpoint is precisely controlled through intelligent monitoring: Throughout the drying process, the weighing sensor 24 (measurement accuracy ±0.1kg) monitors the total weight change of the material tray 23 and the material in real time, transmitting the weight data to the control system. The control system combines the temperature data (0-100℃) and humidity data (10%-90%RH) collected by the temperature and humidity sensor 21 with the preset drying loss curve to accurately calculate the current moisture content of the material. When the moisture content reaches the target value, the system automatically determines the drying endpoint, avoiding the problems of over-drying or under-drying caused by the reliance on experience in traditional equipment. In addition, the touch screen 13 displays the temperature and humidity data, material weight data, and drying progress in real time. If any abnormal parameters occur (such as temperature and humidity deviating from the set values, or abnormal pressure), the system immediately triggers an audible and visual alarm to remind the operator to handle the situation promptly. The casters installed at the bottom of the dryer improve the mobility of the equipment and adapt to the placement requirements of different production scenarios.

[0039] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An energy-saving precision air source heat pump dryer based on temperature and humidity control, characterized in that, include: The system includes a drying chamber, an air source heat pump system, an external steam generator, an air outlet duct system, an online weighing system, a circulating fan, an electric auxiliary heating chamber, and a touch screen; the steam generator is connected to the drying chamber via a steam pipe and supplies steam to the drying chamber via a solenoid valve. The air source heat pump system extracts heat from the environment and supplies heat to the drying chamber via a compressor and condenser. The air outlet duct system utilizes the principle of cold air sinking and hot air rising to discharge low-temperature humid air, and combines it with an evaporator for waste heat recovery. The online weighing system combines data collected by temperature and humidity sensors and determines the drying endpoint based on the drying loss curve. The circulating fan provides power for hot air circulation.

2. The energy-saving and precise air source heat pump dryer based on temperature and humidity control according to claim 1, characterized in that, The steam generator is equipped with a water tank, a manual valve, a power supply, and a pressure display. The purified water added to the water tank has a conductivity of ≤10μS / cm. After the steam generator is started, the steam supply is opened through the manual valve when the preset pressure of 0.4MPa is reached. The solenoid valve is installed on the connection path between the steam pipe and the drying chamber, and the steam delivered by the steam generator is used to balance the evaporation rate of surface moisture and the internal moisture migration rate of the material.

3. The energy-saving precision air source heat pump dryer based on temperature and humidity control according to claim 2, characterized in that, The coefficient of performance (COP) of the air source heat pump system is greater than 3. It includes an evaporator, a gas-liquid separator, a four-way valve, a compressor, a liquid receiver, a condenser, an expansion valve, a filter, and an evaporator fan. Each component is connected in sequence through pipelines to form a circulation loop. The gas-liquid separator is located between the evaporator and the compressor to separate the liquid components in the refrigerant, and the filter is connected in series in the pipeline to filter impurities in the refrigerant.

4. The energy-saving precision air source heat pump dryer based on temperature and humidity control according to claim 3, characterized in that, The air outlet duct system includes a humid air inlet located at the bottom of the drying chamber, an air outlet duct with a built-in centrifugal fan and a dehumidification fan, a dehumidification outlet, and a heat collection chamber; The heat collection chamber houses the evaporator and the evaporation fan. The exhaust port faces the evaporator fins. Low-temperature, humid air is blown toward the fins by the exhaust fan, and the evaporator captures the latent heat contained in the humid air.

5. The energy-saving precision air source heat pump dryer based on temperature and humidity control according to claim 4, characterized in that, The online weighing system includes a weighing sensor, a weighing beam, a material tray, a weighing base, and a material support. The weighing base is located at the bottom of the drying chamber, the weighing sensor is installed above the weighing base, the weighing beam supports the material tray and is connected to the weighing sensor, and the material support is fixed inside the drying chamber to support the material tray. The weighing sensor monitors changes in material weight in real time.

6. The energy-saving precision air source heat pump dryer based on temperature and humidity control according to claim 5, characterized in that, A temperature and humidity sensor is installed on the left side wall of the drying chamber. The temperature and humidity sensor has a measurement range of 0-100℃ and a humidity of 10%-90%RH, and a measurement accuracy of ±1℃ for temperature and ±2%RH for humidity. The drying chamber is also equipped with an air inlet plate, an air outlet plate, and a static pressure box. The static pressure box is located above the air inlet plate. After the air is heated by the electric auxiliary heating chamber, it mixes with the steam and enters the drying chamber evenly through the static pressure box and the air inlet plate. The dried air is discharged to the air outlet duct through the air outlet plate.

7. The energy-saving precision air source heat pump dryer based on temperature and humidity control according to claim 6, characterized in that, The auxiliary electric heating chamber is equipped with an auxiliary electric heating wire, which automatically starts within 10-15 minutes of the initial start-up of the equipment or when the ambient temperature is ≤10℃, to provide secondary heating for the air entering the drying chamber. The circulating fan is located between the heat pump heating chamber and the electric auxiliary heating chamber to provide power for hot air circulation.

8. The energy-saving precision air source heat pump dryer based on temperature and humidity control according to claim 7, characterized in that, The air source heat pump system uses an environmentally friendly refrigerant, and the four-way valve is installed on the pipeline between the gas-liquid separator and the compressor for switching the flow direction of the refrigerant.

9. An energy-saving precision air source heat pump dryer based on temperature and humidity control according to claim 8, characterized in that, The dryer is equipped with pulleys at the bottom; The touch screen is used to set segmented drying parameters, display temperature and humidity data and material weight data in real time, and has an audible and visual alarm function for abnormal parameters.

10. An energy-saving precision air source heat pump dryer based on temperature and humidity control according to claim 9, characterized in that, The opening ratio of the air outlet plate is ≥60%, and the air inlet plate adopts a multi-hole flow equalization design; The dehumidification fan works independently of the centrifugal fan, and the dehumidification fan is only activated when the humidity in the drying chamber is higher than the target value.

Images