Linen drying method and system based on hot air circulation and temperature and humidity combined adjustment

Abstract

The invention relates to the technical field of linen drying systems, and discloses a linen drying method and system based on hot air circulation and temperature and humidity combined adjustment. The problems that in the drying process, an existing linen drying system is poor in temperature and humidity control precision, single in hot air circulation mode, improper in dry cleaning solvent volatilization control and lack of energy recovery and real-time monitoring capacity are solved. The system comprises an intelligent sensing module, a hot air circulation and temperature control module, an energy recovery and environmental protection module, an execution mechanism module and an intelligent control center. The intelligent sensing module comprises a microwave moisture sensor used for monitoring linen core moisture in real time, a thermal infrared imager used for linen surface temperature distribution imaging, a high-precision temperature and humidity sensor used for air duct temperature and humidity monitoring and a solvent concentration sensor used for dry cleaning solvent volatilization monitoring. The linen drying system is high in temperature and humidity control precision in the drying process, diversified in hot air circulation mode and excellent in dry cleaning solvent volatilization control and has the energy recovery and real-time monitoring capacity.

Description

Technical Field

[0001] This invention belongs to the technical field of linen drying systems, specifically a linen drying method and system based on hot air circulation and combined temperature and humidity regulation. Background Technology

[0002] Linen drying is a process that quickly removes moisture from linens using technologies such as heating, airflow circulation, or adsorption. Its core lies in using heat energy to accelerate moisture evaporation, while simultaneously improving dehydration efficiency through airflow optimization (such as hot air circulation and negative pressure adsorption) or physical adsorption (such as molecular sieves and condensation). Compared to natural air drying, drying significantly reduces time (from several hours to tens of minutes) and is not limited by weather or space, making it particularly suitable for humid and rainy areas or scenarios requiring immediate adaptation. Its applications are wide-ranging, covering everyday household use (such as stand-alone dryers and washer-dryer combos), commercial laundry (such as bulk processing in hotels, hospitals, and dry cleaners), industrial production (such as pre-shrinking and shaping in textile processing and garment manufacturing), and special scenarios (such as medical fabric disinfection and rapid drying of outdoor adventure equipment), becoming a key technology for improving efficiency and convenience in modern life. Existing linen drying systems have poor temperature and humidity control precision during the drying process, which can easily lead to linen damage or incomplete drying. Their hot air circulation mode is singular and cannot adapt to the drying needs of linens of different materials. At the same time, improper control of dry cleaning solvent evaporation can easily cause environmental pollution and safety hazards. Furthermore, the lack of energy recovery and real-time monitoring often results in over-drying. Summary of the Invention

[0003] In view of the above situation and to overcome the defects of the prior art, the present invention provides a linen drying method and system based on hot air circulation and combined temperature and humidity regulation, which effectively solves the problems of poor temperature and humidity control accuracy, single hot air circulation mode, improper control of dry cleaning solvent evaporation, and lack of energy recovery and real-time monitoring capabilities in the existing linen drying system mentioned above.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a linen drying method and system based on hot air circulation and temperature and humidity joint regulation, including an intelligent sensing module, a hot air circulation and temperature control module, an energy recovery and environmental protection module, an actuator module, and an intelligent control center; The intelligent sensing module includes a microwave moisture sensor for real-time monitoring of the core moisture of linens, an infrared thermal imager for imaging the temperature distribution on the surface of linens, a high-precision temperature and humidity sensor for monitoring the temperature and humidity of the air duct, and a solvent concentration sensor for monitoring the evaporation of dry cleaning solvents. The hot air circulation and temperature control module includes a variable frequency centrifugal fan, a three-channel intelligent air duct system, a multi-stage heating and humidification system, and a mixing chamber. The variable frequency centrifugal fan is used to provide variable air volume for the three-channel intelligent air duct system, which includes a main drying air duct, a circulating air duct, and a rapid cooling air duct. The energy recovery and environmental protection module includes a double-effect heat exchanger for recovering heat energy, a solvent recovery system for recovering dry cleaning solvents, and a moisture recovery device for recovering water. The actuator module includes an intelligent damper actuator, a roller drive system, and a three-way variable frequency fan; The intelligent control center includes a main control chip, an AI coprocessor, and an edge computing unit, which are used to control the operation of the hot air circulation and temperature control module, the energy recovery and environmental protection module, and the actuator module based on the monitoring data of the intelligent sensing module.

[0005] Preferably, the microwave moisture sensor is a non-contact sensor installed on the inner wall of the drum, the infrared thermal imager is installed in the drum window, the high-precision temperature and humidity sensor is installed at the air inlet and outlet, and the solvent concentration sensor is installed in the exhaust duct.

[0006] Preferably, the variable frequency centrifugal fan achieves three air delivery modes—laminar flow, turbulent flow, and pulse—through variable frequency control. The main drying duct adopts a laminar flow air delivery mode, the circulating duct adopts a turbulent flow air delivery mode, and the rapid cooling duct adopts a pulse air delivery mode. The mixing chamber has a four-way structure and is equipped with a static mixer and guide vanes inside.

[0007] Preferably, the multi-stage heating and humidification system includes a main heater, an auxiliary heater, an ultrasonic humidifier, a steam jet device, and a semiconductor refrigeration condensation dehumidification device. The main heater is a segmented PTC ceramic heater, the auxiliary heater is a graphene infrared radiation plate, the steam jet device is used for shaping linens, the ultrasonic humidifier is used to regulate humidity, and the semiconductor refrigeration condensation dehumidification device is capable of condensation dehumidification.

[0008] Preferably, the double-effect heat exchanger is a heat pipe heat exchanger with a heat recovery efficiency greater than 65%. The solvent recovery system includes a condensation recovery device and an adsorption recovery device. The condensation recovery device uses a compressor to cool to -10°C to recover tetrachloroethylene solvent, and the adsorption recovery device uses a composite filter bed of activated carbon and zeolite molecular sieve.

[0009] Preferably, the intelligent damper actuator includes a fresh air inlet, a circulating damper, an exhaust damper, and a bypass damper. The fresh air inlet uses an electric butterfly valve, which is controlled by PWM to adjust the fresh air ratio. The circulating damper has a louvered structure and is driven by a stepper motor to adjust the circulating air volume. The exhaust damper has an airtight structure and is controlled by a solenoid valve to achieve timed exhaust. The bypass damper has a rotary structure and is driven by a servo motor to achieve air path switching.

[0010] Preferably, the roller drive system includes a BLDC brushless DC motor and a synchronous belt and reducer transmission mechanism, which has multiple motion modes. The power of the BLDC brushless DC motor is 200W, and the multiple motion modes include standard rolling mode 15RPM, shaking mode 30RPM, and shaping mode 5RPM.

[0011] Preferably, the intelligent control center is connected to the intelligent sensing module, hot air circulation and temperature control module, energy recovery and environmental protection module, and actuator module via CAN bus, SPI bus, I2C bus, and Ethernet to realize a hierarchical control architecture.

[0012] The linen drying method based on hot air circulation and combined temperature and humidity regulation includes the following steps: S1: Through the microwave moisture sensor, infrared thermal imager, high-precision temperature and humidity sensor, solvent concentration sensor and weighing system in the intelligent sensing module, the core moisture of the linen, surface temperature distribution, air duct temperature and humidity, solvent concentration and dry and wet weight data are obtained respectively. S2: The intelligent control center calls the corresponding drying parameters based on the data, drives the variable frequency centrifugal fan to start, and controls the three-channel intelligent air path system to switch between laminar flow mode of the main drying air duct, turbulent flow mode of the circulating air duct, and pulse mode of the rapid cooling air duct. S3: Synchronously controls the segmented PTC ceramic heater, graphene infrared radiation plate, ultrasonic humidifier, and semiconductor cooling chip condensation dehumidification device in the multi-stage heating and humidification system to heat, humidify, or dehumidify the air supplied to the mixing chamber. S4: With the cooperation of the actuator module, the intelligent damper actuator adjusts the opening of the fresh air, circulation, exhaust air and bypass ventilation damper, and the roller drive system drives the roller in standard rolling, shaking or shaping mode. S5: During the drying process, exhaust heat energy is continuously recovered through a double-effect heat exchanger, and solvent and moisture are recovered sequentially through a solvent recovery system and a moisture recovery device; S6: When the microwave moisture sensor detects that the moisture content of the linen has reached the set threshold, the intelligent control center stops heating and switches to the rapid cooling air duct pulse mode. After completing the cooling stage, the entire drying process ends.

[0013] Compared with the prior art, the beneficial effects of the present invention are: (1) By switching between laminar flow, turbulent flow and pulse through three channels of variable frequency centrifugal fan, the temperature of the mixing chamber is uniformly controlled, and the microwave moisture is stopped in real time to prevent over-drying. All kinds of linens can achieve a soft, fluffy and non-deformed high-quality effect in one drying. (2) By recovering exhaust heat energy through double-effect heat exchange, preheating fresh air to reduce heating load, and outputting PTC in segments to provide heating on demand, the overall power consumption of the machine is significantly reduced, achieving green and energy-saving dry cleaning and reducing operating costs; (3) The dry cleaning solvent is recovered through condensation and adsorption linkage, and the water is recovered and humidified simultaneously. There is no waste gas or wastewater discharge, the environmental protection indicators are excellent, and a safe and clean working environment is created. (4) The parameters can be matched with one click through the multi-bus intelligent control center, which significantly improves the ease of use of the equipment. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0015] In the attached diagram: Figure 1 This is a diagram of the linen drying system architecture based on hot air circulation and combined temperature and humidity regulation according to the present invention. Figure 2 This is a system architecture diagram of the intelligent control center of the present invention; Figure 3 This is a system architecture diagram of the hot air circulation and temperature control module of the present invention. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0017] Example 1, by Figures 1 to 3 The present invention includes an intelligent sensing module, a hot air circulation and temperature control module, an energy recovery and environmental protection module, an actuator module, and an intelligent control center. The intelligent sensing module includes a microwave moisture sensor for real-time monitoring of the core moisture of linens, an infrared thermal imager for imaging the temperature distribution on the surface of linens, a high-precision temperature and humidity sensor for monitoring the temperature and humidity of the air duct, and a solvent concentration sensor for monitoring the evaporation of dry cleaning solvents. The hot air circulation and temperature control module includes a variable frequency centrifugal fan, a three-channel intelligent air duct system, a multi-stage heating and humidification system, and a mixing chamber. The variable frequency centrifugal fan is used to provide variable air volume for the three-channel intelligent air duct system, which includes a main drying air duct, a circulating air duct, and a rapid cooling air duct. The energy recovery and environmental protection module includes a double-effect heat exchanger for recovering heat energy, a solvent recovery system for recovering dry cleaning solvents, and a moisture recovery device for recovering water. The actuator module includes an intelligent damper actuator, a roller drive system, and a three-way variable frequency fan; The intelligent control center includes a main control chip, an AI coprocessor, and an edge computing unit, which are used to control the operation of the hot air circulation and temperature control module, the energy recovery and environmental protection module, and the actuator module based on the monitoring data of the intelligent sensing module.

[0018] The microwave moisture sensor is a non-contact sensor installed on the inner wall of the drum, with a moisture detection accuracy of ±0.5%. The infrared thermal imager is installed in the drum window, the high-precision temperature and humidity sensor is installed at the air inlet and outlet, and the solvent concentration sensor is installed in the exhaust duct. The air volume adjustment range of the variable frequency centrifugal fan is 0-1000m³ / h. The variable frequency centrifugal fan realizes three air supply modes: laminar flow, turbulent flow, and pulse through frequency conversion control. The main drying air duct adopts the laminar flow air supply mode, the circulating air duct adopts the turbulent flow air supply mode, and the rapid cooling air duct adopts the pulse air supply mode. The mixing chamber has a four-way structure and is equipped with a static mixer and guide vanes inside, with a temperature uniformity of ±1.5℃. The multi-stage heating and humidification system includes a main heater, an auxiliary heater, an ultrasonic humidifier, a steam jet device, and a semiconductor cooling chip condensation dehumidification device. The main heater is a segmented PTC ceramic heater with a power of 6kW and 8 independently controlled segments. The auxiliary heater is a graphene infrared radiation plate. The maximum humidification capacity of the ultrasonic humidifier is 500mL / h. The steam jet device is used for shaping linens, the ultrasonic humidifier is used to regulate humidity, and the semiconductor cooling chip condensation dehumidification device can condense and dehumidify. The double-effect heat exchanger is a heat pipe heat exchanger with a heat recovery efficiency of more than 65%, which can reduce the exhaust temperature from 45℃ to 20℃ and preheat the inlet air temperature from 20℃ to 38℃. The solvent recovery system includes a condensation recovery device and an adsorption recovery device. The condensation recovery device uses a compressor to cool to -10℃ to recover tetrachloroethylene solvent, and the adsorption recovery device uses a composite filter bed of activated carbon and zeolite molecular sieves, with a solvent residual concentration of less than 10ppm. The intelligent damper actuator includes a fresh air inlet, a circulating damper, an exhaust damper, and a bypass damper. The fresh air inlet uses an electric butterfly valve, which is controlled by PWM to adjust the fresh air ratio. The circulating damper has a louvered structure and is driven by a stepper motor to adjust the circulating air volume. The exhaust damper has an airtight structure and is controlled by a solenoid valve to achieve timed exhaust. The bypass damper has a rotary structure and is driven by a servo motor to achieve air path switching. The roller drive system includes a BLDC brushless DC motor, a synchronous belt, and a reducer transmission mechanism. It has multiple motion modes. The BLDC brushless DC motor has a power of 200W. The multiple motion modes include a standard rolling mode of 15RPM, a shaking mode of 30RPM, and a shaping mode of 5RPM. The intelligent control center connects to the intelligent sensing module, hot air circulation and temperature control module, energy recovery and environmental protection module, and actuator module via CAN bus, SPI bus, I2C bus, and Ethernet to realize a hierarchical control architecture.

[0019] The linen drying method based on hot air circulation and combined temperature and humidity regulation includes the following steps: S1: Through the microwave moisture sensor, infrared thermal imager, high-precision temperature and humidity sensor, solvent concentration sensor and weighing system in the intelligent sensing module, the core moisture of the linen, surface temperature distribution, air duct temperature and humidity, solvent concentration and dry and wet weight data are obtained respectively. S2: The intelligent control center calls the corresponding drying parameters based on the data, drives the variable frequency centrifugal fan to start, and controls the three-channel intelligent air path system to switch between laminar flow mode of the main drying air duct, turbulent flow mode of the circulating air duct, and pulse mode of the rapid cooling air duct. S3: Synchronously controls the segmented PTC ceramic heater, graphene infrared radiation plate, ultrasonic humidifier, and semiconductor cooling chip condensation dehumidification device in the multi-stage heating and humidification system to heat, humidify, or dehumidify the air supplied to the mixing chamber. S4: With the cooperation of the actuator module, the intelligent damper actuator adjusts the opening of the fresh air, circulation, exhaust air and bypass ventilation damper, and the roller drive system drives the roller in standard rolling, shaking or shaping mode. S5: During the drying process, exhaust heat energy is continuously recovered through a double-effect heat exchanger, and solvent and moisture are recovered sequentially through a solvent recovery system and a moisture recovery device;

[0020] S6: When the microwave moisture sensor detects that the moisture content of the linen has reached the set threshold, the intelligent control center stops heating and switches to the rapid cooling air duct pulse mode. After completing the cooling stage, the entire drying process ends.

Claims

1. A linen drying system based on hot air circulation and temperature and humidity combined regulation, comprising an intelligent sensing module, a hot air circulation and temperature control module, an energy recovery and environmental protection module, an actuator module, and an intelligent control center. The intelligent sensing module includes a microwave moisture sensor for real-time monitoring of linen core moisture, an infrared thermal imager for linen surface temperature distribution imaging, a high-precision temperature and humidity sensor for air duct temperature and humidity monitoring, and a solvent concentration sensor for dry cleaning solvent evaporation monitoring. The hot air circulation and temperature control module includes a variable frequency centrifugal fan, a three-channel intelligent air duct system, a multi-stage heating and humidifying system, and a mixed air chamber. The variable frequency centrifugal fan provides variable air volume for the three-channel intelligent air duct system, which includes a main drying air duct, a circulating air duct, and a rapid cooling air duct. The energy recovery and environmental protection module includes a double-effect heat exchanger for heat recovery, a solvent recovery system for dry cleaning solvent recovery, and a moisture recovery device. The actuator module includes an intelligent air door actuator, a drum drive system, and a three-way variable frequency fan. The intelligent control center includes a main control chip, an AI coprocessor, and an edge computing unit, which controls the operation of the hot air circulation and temperature control module, the energy recovery and environmental protection module, and the actuator module based on the monitoring data of the intelligent sensing module.

2. The linen drying system based on hot air circulation combined with temperature and humidity regulation according to claim 1, characterized in that: The microwave moisture sensor is a non-contact sensor installed on the inner wall of the drum, the infrared thermal imager is installed on the drum window, the high-precision temperature and humidity sensor is installed on the inlet and outlet air ports, and the solvent concentration sensor is installed on the exhaust duct.

3. The linen drying system based on hot air circulation combined with temperature and humidity regulation according to claim 1, characterized in that: The variable frequency centrifugal fan realizes three air supply modes: laminar flow, turbulent flow, and pulse. The main drying air duct uses laminar flow mode, the circulating air duct uses turbulent flow mode, and the rapid cooling air duct uses pulse mode. The mixed air chamber has a four-way structure with a static mixer and guide vanes inside.

4. The linen drying system based on hot air circulation combined with temperature and humidity regulation according to claim 1, characterized in that: The multi-stage heating and humidifying system includes a main heater, an auxiliary heater, an ultrasonic humidifier, a steam injection device, and a semiconductor refrigeration plate condensation and dehumidification device. The main heater is a segmented PTC ceramic heater, the auxiliary heater is a graphene infrared radiation plate, the steam injection device is used for linen shaping, the ultrasonic humidifier is used to adjust humidity, and the semiconductor refrigeration plate condensation and dehumidification device can condense and dehumidify.

5. The linen drying system based on hot air circulation combined with temperature and humidity regulation according to claim 1, characterized in that: The double-effect heat exchanger is a heat pipe heat exchanger with a heat recovery efficiency greater than 65%. The solvent recovery system includes a condensation recovery device and an adsorption recovery device. The condensation recovery device uses a compressor to cool to -10°C to recover tetrachloroethylene solvent, and the adsorption recovery device uses an activated carbon and zeolite molecular sieve composite filter bed.

6. The linen drying system based on hot air circulation combined with temperature and humidity regulation according to claim 1, characterized in that: The intelligent air door actuator includes a fresh air inlet, a circulating air door, an exhaust air door, and a bypass air door. The fresh air inlet uses an electric butterfly valve, which is controlled by PWM to adjust the fresh air ratio. The circulating air door is a louvered structure driven by a stepper motor to adjust the circulating air volume. The exhaust air door is an airtight structure controlled by a solenoid valve to realize timed exhaust. The bypass air door is a rotary structure driven by a servo motor to realize air duct switching.

7. The linen drying system based on hot air circulation combined with temperature and humidity regulation according to claim 1, characterized in that: The roller driving system comprises a BLDC brushless DC motor and a synchronous belt and reducer transmission mechanism, which has multiple motion modes, the power of the BLDC brushless DC motor is 200W, and the multiple motion modes include a standard rolling mode 15RPM, a shaking mode 30RPM and a shaping mode 5RPM.

8. The linen drying system based on hot air circulation combined with temperature and humidity regulation according to claim 1, characterized in that: The intelligent control center is connected with the intelligent sensing module, the hot air circulation and temperature control module, the energy recovery and environmental protection module and the actuator module through CAN bus, SPI bus, I2C bus and Ethernet, so as to realize a hierarchical control architecture.

9. The linen drying method based on hot air circulation combined with temperature and humidity regulation according to any one of claims 1 to 9, characterized in that, The method comprises the following steps: S1: obtaining the linen core moisture, surface temperature distribution, air duct temperature and humidity, solvent concentration and dry and wet weight data through the microwave moisture sensor, infrared thermal imager, high-precision temperature and humidity sensor, solvent concentration sensor and weighing system in the intelligent sensing module; S2: calling the corresponding drying parameters according to the data through the intelligent control center, driving the variable frequency centrifugal fan to start, and controlling the three-channel intelligent air duct system to switch between the main drying air duct laminar flow mode, the circulating air duct turbulent flow mode and the rapid cooling air duct pulse mode; S3: synchronously controlling the segmented PTC ceramic heater, graphene infrared radiation plate, ultrasonic humidifier and semiconductor refrigeration piece condensation dehumidification device in the multi-stage heating and humidifying system to heat, humidify or dehumidify the air sent into the mixed air chamber; S4: adjusting the fresh air, circulating air, exhaust air and bypass air door opening degree by the intelligent air door actuator under the cooperation of the actuator module, and driving the roller by the roller driving system according to the standard rolling mode, shaking mode or shaping mode; S5: continuously recovering the exhaust heat energy through the double-effect heat exchanger during the drying process, and recovering the solvent and moisture through the solvent recovery system and moisture recovery device in turn; S6: when the microwave moisture sensor detects that the moisture content of the linen reaches the set threshold, the intelligent control center stops heating and switches to the rapid cooling air duct pulse mode, and completes the cooling stage and ends the whole drying process.

Images