Auxiliary heat source deep dehumidification closed heat pump clothes dryer and control method

Abstract

The invention belongs to the technical field of clothes drying equipment, and particularly relates to an auxiliary heat source deep dehumidification closed heat pump clothes dryer and a control method.The clothes dryer comprises a drying chamber, a closed circulating air duct and a second air duct, and an auxiliary heat source, an auxiliary cold source, a dehumidification area of a rotating wheel dehumidification device and a second fan are arranged in the second air duct; an evaporator, a moisture absorption area of the rotating wheel dehumidification device, a condenser and a first draught fan are sequentially arranged in a closed circulation air duct, temperature sensors are arranged on the air inlet side and the air outlet side of a second air duct correspondingly and used for detecting the air inlet temperature T1 and the air outlet temperature T2, and the start-stop state of the auxiliary heat source or the start-stop state of the auxiliary heat source and the start-stop state of the auxiliary cold source are controlled based on the detection result. And by detecting the return air temperature Tout of the drying chamber, dynamic switching of a bypass air duct switch is controlled, and intelligent adjustment of the return air path is achieved. According to the method, the humidity knowing depth and efficiency are improved, the energy consumption is reduced, the capability of adapting to multi-scene use is improved, and the method has good energy saving performance, control precision and operation stability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of clothes drying equipment, and particularly relates to an auxiliary heat source deep dehumidification closed heat pump clothes dryer and a control method. BACKGROUND

[0002] With the improvement of people's living standards and the continuous enhancement of energy-saving and environmental protection consciousness, the performance and energy efficiency requirements of clothes drying equipment are increasingly improved. Although the traditional electric heating type clothes dryer has certain drying capacity, it has high energy consumption, low electric energy conversion efficiency, and very low heat energy recycling rate during the drying process, and has been difficult to meet the development trend of modern energy saving and environmental protection. Under this background, the heat pump type clothes dryer gradually replaces the electric heating drying method because of its obvious advantages of high efficiency, energy saving and low temperature drying, and becomes an important development direction of current household and industrial clothes drying equipment.

[0003] The heat pump clothes drying equipment is mainly based on the principle of compressor refrigeration cycle, and through the use of the evaporator to cool and dehumidify the hot and humid air during the drying process and the use of the condenser to heat and warm the air, a closed circulation path is formed to realize the cooperative operation of clothes drying and heat recovery. Compared with the traditional heating method, this system can significantly reduce energy consumption, while maintaining high drying efficiency under low temperature operating conditions. Therefore, the heat pump clothes dryer has been widely used in the medium and high-end household market and some industrial drying scenes.

[0004] However, although the heat pump clothes drying technology has advantages in energy saving, there are still the following deficiencies in actual use: the dehumidification capacity mainly depends on the condensation effect of the evaporator on the hot and humid air discharged from the drum, especially in low temperature and high humidity environment conditions or when the initial water content of the clothes is high, the condensation efficiency of the evaporator surface will decrease significantly, resulting in insufficient dehumidification depth of the whole machine, and then affecting the drying efficiency and time. In addition, as the water in the humid air gradually decreases, the condensation efficiency of the evaporator further decreases, making it difficult to achieve deep dehumidification of the residual moisture in the tail gas, and the drying cycle is forced to be prolonged, and the user experience is reduced.

[0005] In order to improve the dehumidification capacity of the heat pump clothes dryer under low temperature and high humidity conditions, some schemes in the prior art introduce a rotary dehumidification technology combined with a heat pump system. The rotary dehumidification device usually takes a continuously rotating honeycomb-shaped rotary wheel as the core, and the surface of the rotary wheel is loaded with porous materials such as silica gel, molecular sieve or MOF material which have dehumidification capacity. When the humid air passes through the dehumidification zone of the rotary wheel, the water in the air is adsorbed on the surface of the material, and the dehumidified rotary wheel rotates to the dehumidification zone and is regenerated by heating air, so as to realize continuous dehumidification cycle. This structure has the advantages of stable operation, high dehumidification efficiency and low temperature operation, and has been gradually tried to be combined with the heat pump clothes drying system in recent years to build a composite dehumidification clothes drying system.

[0006] Although the prior art has made some progress in improving the energy efficiency and dehumidification capacity of clothes drying, there are still the following problems in the combined use of heat pump systems and rotary dehumidification devices: First: The dehumidification of the heat pump clothes dryer relies too much on the condensation of the evaporator. When the environmental temperature is complex or the moisture content of the clothes is high, the condensation efficiency of the evaporator decreases sharply, which cannot achieve deep dehumidification, resulting in prolonged drying time and increased energy consumption, and it is difficult to meet the demand for efficient clothes drying. Second: The combination of the two is not mature. The moisture absorption and moisture release processes of the rotary dehumidification device lack effective cooperation. In the existing design, the regenerated (moisture release) rotary wheel after moisture absorption lacks an adaptive heat source supply method, and the moisture release efficiency is low. At the same time, the air duct layout is unreasonable, and an independent and adaptive moisture absorption and moisture release air path has not been formed, which easily causes heat and moisture interference, resulting in the inability of the rotary wheel to fully play its performance. Third, in the design of the air duct and the energy recovery path, most of the existing heat pump clothes drying equipment uses a single circulating air duct or a double air duct structure that is not completely isolated. The wet air treatment path and the regenerated air path in the system cannot be fully coupled, and the heat recovery utilization rate is low. Fourth: In terms of control strategy, the existing system generally uses heating control logic based on fixed temperature threshold or humidity threshold. In the key links of regenerated auxiliary heat source control, auxiliary cold source control, and regenerated air path switching, there is a lack of dynamic feedback and precise matching mechanism, which easily causes overheating, delayed response, or energy consumption redundancy, affecting the safety and energy saving of the system.

[0007] Therefore, it is urgent to propose a new type of heat pump rotary dehumidification integrated clothes drying technology scheme with high dehumidification efficiency, low energy consumption, and dynamic controllability to overcome the above-mentioned deficiencies in the prior art and improve the operating performance and user experience of the clothes drying equipment under various climate conditions. SUMMARY

[0008] The present application aims to solve at least one of the problems of the existing heat pump clothes drying equipment, such as insufficient dehumidification efficiency, low heat energy utilization rate, and inaccurate moisture release control under low temperature and high humidity conditions.

[0009] Therefore, the present application provides an auxiliary heat source deep dehumidification closed heat pump clothes dryer and a control method. By constructing a closed main air duct and an auxiliary moisture release air duct, connecting an evaporator and a rotary dehumidification structure, introducing an auxiliary heat source and a cold source for efficient heat management of the moisture release process, and assisting with temperature control feedback and bypass regulation mechanism, the system realizes double deep dehumidification of wet air, rapid regeneration of rotary dehumidification material, and dynamic energy efficiency regulation of system operation, thereby improving the overall drying efficiency and system stability, and meeting the intelligent energy-saving clothes drying demand under various environmental conditions.

[0010] The first purpose of the present application is to disclose an auxiliary heat source deep dehumidification closed heat pump clothes dryer, comprising: a drying chamber for accommodating clothes to be dried and performing heat and moisture exchange; a closed circulation air duct in communication with the drying chamber for circulating and conveying dry air; a heat pump system comprising an evaporator and a condenser arranged in the closed circulation air duct in sequence, the evaporator being used for cooling and dehumidifying the air flowing out of the drying chamber, and the condenser being used for heating and warming the air dehumidified in the closed circulation air duct; a first air fan for driving the air in the closed circulation air duct to circulate along a flow direction from the drying chamber to the evaporator, the condenser and the drying chamber in sequence; a rotary dehumidification device comprising a moisture absorption zone and a moisture release zone, the moisture absorption zone being arranged in the closed circulation air duct and located between the evaporator and the condenser; a second air duct having a first air inlet in communication with the external environment at one end and a first air outlet for discharging air to the environment at the other end, the moisture release zone being arranged in the second air duct; an auxiliary heat source arranged in the second air duct and located between the first air inlet and the moisture release zone, for heating fresh air introduced into the second air duct and providing heat required for rotary dehumidification.

[0011] In some examples of the present application, an auxiliary cold source is arranged in the second air duct, located between the moisture release zone and the first air outlet, for cooling the air discharged after dehumidification.

[0012] In some examples of the present application, a second air fan is arranged in the second air duct, for guiding the external environment fresh air through the first air inlet, the auxiliary heat source, the moisture release zone in sequence and discharging it from the first air outlet.

[0013] In some examples of the present application, temperature sensors are arranged on the air inlet side and the air outlet side of the second air duct respectively, for detecting the air inlet temperature T1 and the air outlet temperature T2 of the second air duct, and controlling the start-stop state of the auxiliary heat source or the auxiliary heat source and the auxiliary cold source based on the detection results.

[0014] In some examples of the present application, a bypass air duct is arranged in the closed circulation air duct, one end of the bypass air duct being in communication with the air inlet side of the evaporator, and the other end being in communication with the air inlet side of the moisture absorption zone, the bypass air duct being used for directly introducing part of the return air in the closed circulation air duct into the moisture absorption zone of the rotary dehumidification device to be adsorbed and dehumidified.

[0015] In some examples of the present application, a switching switch is arranged in the closed circulation air duct and / or the bypass air duct, for switching the on-off of the bypass air duct.

[0016] In some examples of the present application, a third temperature sensor is arranged at the air outlet of the drying chamber to detect the return air temperature, and the switching switch is controlled based on the detection result to adjust the on-off state of the bypass air duct.

[0017] In some examples of the present application, the auxiliary heat source is one or a combination of electric heating device, hot water heat exchanger or steam heat exchanger, and the auxiliary cold source is water-cooled heat exchanger or semiconductor refrigeration device.

[0018] A second object of the present application is to disclose a control method of a deep dehumidification closed heat pump clothes dryer with auxiliary heat source, applied to the deep dehumidification closed heat pump clothes dryer with auxiliary heat source as described above, comprising: a first temperature threshold T 阈1 , a second temperature threshold T 阈2 , T 阈1 , T 阈2 , T 阈1 , T 阈2 ; detecting the inlet air temperature T1 and the outlet air temperature T2 of the second air duct, wherein T1 is the temperature of the introduced external fresh air, and T2 is the temperature of the air after dehumidification; when T1 < T 阈1 , the auxiliary heat source is turned on or the auxiliary heat source and the auxiliary cold source are turned on at the same time, so that the auxiliary heat source heats the fresh air entering the second air duct and flows to the dehumidification area for rotary regeneration, and the auxiliary cold source cools the air after dehumidification; otherwise, the auxiliary heat source is turned off or the auxiliary heat source and the auxiliary cold source are turned off at the same time, so that the fresh air entering the second air duct is regenerated in the dehumidification area alone; during the process of turning on the auxiliary heat source, when T2 ≥ T 阈2 , the auxiliary heat source is turned off or the auxiliary heat source and the auxiliary cold source are turned off at the same time, so that the fresh air entering the second air duct is regenerated in the dehumidification area alone.

[0019] In some examples of the present application, during the execution of the drying program, the return air temperature T out of the drying chamber is continuously monitored; if T out ≤ T 阈3 is detected for n consecutive seconds, the switching switch on the bypass air duct is turned on, so that part of the return air directly enters the moisture absorption area of the rotary dehumidification device while bypassing the evaporator; if T out ≥ T 阈4 is detected for n consecutive seconds, the switching switch on the bypass air duct is turned off, so that all return air flows through the evaporator for cooling and dehumidification; wherein n is a preset detection time, T 阈3 , T 阈4To set a preset temperature parameter based on a clothes drying stage, and T 阈3 <T 阈4 .

[0020] Compared with the prior art, the automobile tail gate pull cable winding mechanism and the vehicle having the same have the following advantages: 1. The application sets an evaporator, a moisture absorption zone and a condenser in the closed circulation air duct in sequence to build an evaporation condensation + adsorption combined dehumidification path, cooperates with the high-temperature regeneration capacity of the auxiliary heat source built in the second air duct to realize segmented processing of the wet air and continuous efficient moisture removal of the rotary dehumidification material, and significantly improves the dehumidification depth and drying speed in a low-temperature and high-humidity environment.

[0021] 2. The application sets the second air duct for regeneration of the moisture removal zone, and configures an auxiliary cold source in the second air duct to cool and dehumidify the exhaust air, and combines two temperature sensors to form a feedback control loop, so that the system can dynamically control the start and stop of the auxiliary heat source and the auxiliary cold source according to the real-time inlet and outlet air temperatures, so as to ensure efficient regeneration of the rotary wheel while avoiding energy waste and hot exhaust pollution.

[0022] 3. The application further introduces a bypass air duct and a switching switch, cooperates with continuous monitoring and judgment of the return air temperature, realizes intelligent air flow switching of the main air duct and the bypass air duct, so that the system can automatically adjust the air path structure according to the moisture content of the clothes and the drying stage, optimize the moisture absorption efficiency and system load distribution, prolong the service life of the components while maintaining energy efficiency, and improve the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is an operation principle schematic diagram of the auxiliary heat source deep dehumidification closed heat pump clothes dryer described in the embodiment of the application; Figure 2 It is a control method logic diagram of the rotary dehumidification device in the auxiliary heat source deep dehumidification closed heat pump clothes dryer described in the embodiment of the application; Figure 3 It is a control method logic diagram of the bypass air duct in the auxiliary heat source deep dehumidification closed heat pump clothes dryer described in the embodiment of the application; The mark in the figure represents: 1-drying chamber; 2-closed circulation air duct; 3-evaporator; 4-rotary dehumidification device; 401-moisture absorption zone; 402-moisture removal zone; 5-condenser; 6-first air fan; 7-second air duct; 8-first air inlet; 9-second air fan; 10-auxiliary heat source; 11-auxiliary cold source; 12-first air outlet; 13-bypass air duct; 14-switching switch. DETAILED DESCRIPTION

[0024] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly described. Obviously, the described embodiments are a part rather than all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art should fall within the protection scope of the present application.

[0025] It should be noted that all the terms indicating direction and position in the present application, such as “upper”, “lower”, “left”, “right”, “front”, “back”, “vertical”, “horizontal”, “inner”, “outer”, “top”, “low”, “lateral”, “longitudinal”, “center” and the like, are only used to explain the relative position relationship, connection condition and the like between components in a certain state (as shown in the drawings), and are only for the convenience of describing the present application, and thus cannot be understood as a limitation on the present application. In addition, the description of “first”, “second” and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features.

[0026] In the description of the present application, unless otherwise explicitly specified and limited, the terms “mounting”, “connection” and “connection” should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] In the description of the present application, the description of the terms “one embodiment”, “some embodiments”, “illustrative embodiment”, “example”, “specific example” or “some examples” means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0028] As Figure 1 shown, the present application discloses a kind of auxiliary heat source deep dehumidification closed heat pump clothes dryer, comprising: Drying chamber 1 is used to accommodate clothes to be dried and carry out heat and humidity exchange; Closed circulation air duct 2 is communicated with the drying chamber 1, for circulating and conveying dry air; The heat pump system comprises an evaporator 3 and a condenser 5 arranged in the closed circulation air duct 2 in sequence, the evaporator 3 is used for cooling and dehumidifying the air flowing out of the drying chamber 1, and the condenser 5 is used for heating and warming the dehumidified air in the closed circulation air duct 2; A first fan 6 is used for driving the air in the closed circulation air duct 2 to circulate along the flow direction of the evaporator 3, the condenser 5 and the drying chamber 1 between the drying chamber 1 and the closed circulation air duct 2; The rotary dehumidifying device 4 comprises a moisture absorbing area 401 and a moisture releasing area 402, the moisture absorbing area 401 is arranged in the closed circulation air duct 2 and located between the evaporator 3 and the condenser 5; A second air duct 7 is provided with a first air inlet 8 communicating with the external environment at one end and a first air outlet 12 discharging to the environment at the other end, and the moisture releasing area 402 is arranged in the second air duct 7; An auxiliary heat source 10 is arranged in the second air duct 7 and used for heating the fresh air introduced into the second air duct 7 and providing the heat required for the rotary dehumidifying.

[0029] The application discloses an auxiliary heat source deep dehumidification closed heat pump clothes dryer. A first air duct is constructed in a closed mode and comprises an evaporator 3 through which hot and humid air flows out of a drying chamber 1, a moisture absorption zone 401 of a rotary dehumidification device 4 and a condenser 5, which are driven by a first fan 6 to form a closed drying circulation path with the evaporator 3, the moisture absorption zone 401 and the condenser 5 as cores, namely a closed circulation air duct 2. The moisture absorption zone 401 of the rotary dehumidification device 4 is arranged between the evaporator 3 and the condenser 5 and is used for adsorbing water vapor remaining after preliminary condensation and dehumidification, so that the dehumidification depth and the air drying degree are greatly improved. A second air duct 7 is constructed in an auxiliary fresh air channel mode, one end of which introduces external air through a first air inlet 8, and the other end of which discharges hot air after dehumidification through a first air outlet 12. A dehumidification zone 402 of the rotary dehumidification device 4 is located in the middle of the second air duct 7. An auxiliary heat source 10 is arranged in the second air duct 7 and close to the first air inlet 8 and is used for heating the introduced fresh air to a set temperature, so that the rotary dehumidification material has the heat required for dehumidification, thereby realizing desorption and regeneration of the rotary dehumidification material. When the clothes dryer is running, the first fan 6 is started to drive air to flow out of the drying chamber 1, sequentially pass through the evaporator 3 for preliminary condensation and dehumidification, enter the moisture absorption zone 401 of the rotary dehumidification device 4 for deep adsorption of residual moisture, and then flow into the condenser 5 to be heated and warmed, and then flow into the drying chamber 1 to contact clothes, thereby forming a closed drying circulation. At the same time, external environment fresh air is sucked into the second air duct 7 through natural suction or auxiliary suction of a second fan 9, the air is heated to a set temperature by the auxiliary heat source 10 in the second air duct 7, flows through the dehumidification zone 402 of the rotary dehumidification device 4, the water vapor adsorbed by the moisture absorption zone 401 is resolved and taken away with the hot air, and the continuous regeneration of the rotary dehumidification material is realized. The regenerated hot and humid air is discharged to the external environment through the first air outlet 12 of the second air duct 7, thereby constructing a continuous dehumidification circulation of moisture absorption and dehumidification. In the whole process, the closed circulation air duct 2 (the first air duct) realizes sufficient treatment of dry air, the second air duct 7 realizes efficient regeneration of the dehumidification material, the two systems work in parallel and do not interfere with each other, and a high-efficiency clothes drying structure in a cooperative operation mode is formed.

[0030] The application can realize deep dehumidification of hot and humid air in normal temperature, low temperature or high humidity environment through the double dehumidification path of the evaporator 3 and the moisture absorption zone 401, the circulating flow driven by the first fan 6 ensures sufficient air treatment, improves the drying efficiency, the moisture absorption zone 401 and the moisture removal zone 402 of the rotary dehumidification device 4 are located in two air ducts respectively, which avoids the mutual interference of the moisture absorption and moisture removal processes, ensures the stable play of their respective functions, the auxiliary heat source 10 in the second air duct 7 heats the fresh air to provide enough heat for moisture removal, effectively improves the moisture removal regeneration efficiency of the rotary wheel, ensures that the rotary wheel continuously maintains good moisture absorption performance, realizes the cooperation of efficient dehumidification and rotary wheel regeneration without additional complex devices, reduces energy consumption, improves the stability and reliability of the equipment operation, and enables users to complete the clothes drying faster and more energy-efficiently.

[0031] As a preferred example of the application, the second air duct 7 is provided with an auxiliary cold source 11, which is arranged between the moisture removal zone 402 and the first air outlet 12, for cooling the air discharged in the second air duct 7. In the example of the application, by arranging the auxiliary cold source 11 between the moisture removal zone 402 and the first air outlet 12 of the rotary dehumidification device 4, the auxiliary cold source 11 can adopt the form of a cooler, a heat exchange sheet or a semiconductor refrigeration assembly, etc., for cooling and processing the air with high temperature and high humidity after completing the moisture removal function. The overall path is: the external fresh air enters the second air duct 7 through the first air inlet 8 and is heated to a set temperature by the auxiliary heat source 10, flows through the moisture removal zone 402 to make the rotary dehumidification material analyze the moisture and be discharged with the airflow. Before entering the first air outlet 12, the discharged air passes through the auxiliary cold source 11 area, the auxiliary cold source 11 effectively absorbs the heat energy and reduces the airflow temperature, and part of the water vapor can be condensed into liquid water and separated or collected by means of temperature difference. The remaining airflow is discharged from the first air outlet 12 to the external environment with lower temperature and humidity. The setting of the auxiliary cold source 11 does not need to make major changes to the overall system air path, only needs to add a cooling component in the existing air duct, which can realize the regulation and control of the quality of the discharged airflow, thereby avoiding the adverse effects of hot and humid exhaust air directly entering the environment.

[0032] The application significantly reduces the temperature of the air discharged to the external environment by providing an auxiliary cold source 11, avoids the problem of temperature rise of the space around the equipment, condensation water or damage to nearby objects caused by direct discharge of high-temperature and high-humidity air, effectively reduces the water vapor content in the exhaust air, reduces the formation of water stains caused by the condensation of discharged humid air, maintains the cleanliness and safety of the working area of the clothes dryer, helps users to keep the floor dry when using the clothes dryer indoors, and improves the overall user experience. The application forms a complete "heating - dehumidification - cooling" air flow circulation logic with the auxiliary heat source 10, which not only meets the regeneration heat conditions required by the rotary dehumidifier, but also ensures that the final air flow state is suitable for external discharge, which not only improves the energy efficiency ratio, but also widens the applicability of the device in family, commercial and special humid and hot environments, and further improves the overall performance of the equipment. In the example of the application, the auxiliary cold source 11 can be selectively adapted.

[0033] As a preferred example of the application, the second air duct 7 is provided with a second fan 9, which is used to drive the external fresh air to pass through the first air inlet 8, the auxiliary heat source 10, the dehumidification area 402 and the first air outlet 12 in sequence to complete the dehumidification process of the rotary wheel. In the example of the application, a second fan 9 is additionally arranged in the second air duct 7, which is located between the first air inlet 8 and the first air outlet 12 and arranged close to the first air inlet 8. Its role is to provide stable power for the flow of fresh air in the second air duct 7, so that after the external fresh air enters through the first air inlet 8, it can flow through the auxiliary heat source 10, the dehumidification area 402 of the rotary dehumidifier 4, the auxiliary cold source 11 in the second air duct 7 in sequence under the pushing action of the second fan 9, and finally be discharged from the first air outlet 12. The auxiliary heat source 10 heats the fresh air to a set temperature to meet the dehumidification requirement of the rotary wheel. The hot air in the dehumidification area 402 makes the rotary dehumidification material release the absorbed water to form high-temperature and high-humidity gas, which then flows through the auxiliary cold source 11 area for cooling and removal of part of the water, and finally forms temperature suitable exhaust air discharged to the external environment. In this process, the second fan 9 ensures the continuous flow of the entire auxiliary dehumidification air path, the controllable flow rate and avoids the air flow fluctuation problem caused by relying on natural ventilation, so that the heating, dehumidification and exhaust process are carried out in coordination, which is more efficient. At the same time, it can also dynamically adjust the wind speed to match the heat source output according to the required dehumidification intensity or environmental changes, so as to ensure that the rotary dehumidification material can continuously complete efficient dehumidification regeneration. The structure is compact and the layout is reasonable, which not only improves the flow efficiency of the dehumidification channel, but also forms a complete operation system with the heat source and the cold source, enhances the operation coordination and wind path response flexibility of the whole machine.

[0034] As a preferred example of the present application, a bypass air duct 13 is arranged in the closed circulation air duct 2, one end of the bypass air duct 13 communicates with the air inlet side of the evaporator 3, and the other end communicates with the air inlet side of the moisture absorption zone 401, the bypass air duct 13 is used to make part of the return air in the closed circulation air duct 2 directly enter the moisture absorption zone 401 of the rotary dehumidification device 4 to be adsorbed and dehumidified. In the example of the present application, by adding a bypass air duct 13 in the closed circulation air duct 2, one end of the bypass air duct 13 is connected to the air inlet side of the evaporator 3, and the other end is connected to the air inlet side of the moisture absorption zone 401 in the rotary dehumidification device 4, thereby providing a flow path for the return air to bypass the evaporator 3, the closed circulation air duct 2 is used to connect the drying chamber 1 and the heat pump system, the evaporator 3 and the condenser 5 in the heat pump system are used to cool and dehumidify and heat and warm the circulating air respectively, the air driven by the first fan 6 flows in the closed loop through the evaporator 3, the moisture absorption zone 401, the condenser 5 and back to the drying chamber 1, and part of the return air is guided by the newly added bypass air duct 13 to bypass the evaporator 3 and directly enter the moisture absorption zone 401 to be adsorbed and dehumidified under certain working conditions, so that part of the high-temperature air can directly participate in the dehumidification process without being cooled, which not only improves the utilization efficiency of heat, but also reduces the load of the evaporator 3 and the condenser 5. In particular, during the initial drying stage or the humidity fluctuation stage, the high-temperature air guided by the bypass air duct 13 can effectively accelerate the establishment of the temperature stability of the moisture absorption zone 401, improve the adsorption efficiency of the rotary dehumidification material, and the subsequent air and the main path air flow are combined after the moisture absorption zone 401 and then enter the condenser 5 for unified heating, so that the air can maintain a high temperature while achieving a low humidity, and the drying chamber 1 is continuously provided with suitable dry hot air. The whole air flow path forms an efficient closed loop air flow system through the cooperation of the main channel and the bypass channel, in which heat recovery and segmented dehumidification are carried out in parallel. In the example of the present application, the bypass air duct 13 is arranged upstream of the evaporator 3 along the air flow direction in the closed circulation air duct 2, and the first fan 6 is arranged downstream of the condenser 5 along the air flow direction in the closed circulation air duct 2.

[0035] As a preferred example of this application, a switching switch 14 is provided in the closed-loop air duct 2 and / or the bypass air duct 13. The switching switch 14 is used to control the on / off state of the bypass air duct 13 to switch the flow path of the return air. In the example of this application, by setting the switching switch 14 in the bypass air duct 13, the switching switch 14 can be arranged at the bypass air duct body or the main air duct node connected to it, and is used to switch the open or closed state of the bypass air duct 13 according to different operating requirements. During the operation of the drying program, when the switching switch 14 is in the open state, part of the return air in the closed-loop air duct 2 bypasses the evaporator 3 and directly enters the bypass air duct 13 under the action of the first fan 6, and is guided to the moisture absorption zone 401 of the rotary dehumidifier 4 by this path. The air enters the adsorption ring with relatively high heat energy without undergoing cooling treatment. The airflow from the evaporator 3, after being cooled and dehumidified by the evaporator 3, is then heated in the condenser 5 and returned to the drying chamber 1, forming a complete closed-loop airflow path. When the switch 14 is closed, all return air flows through the evaporator 3 for cooling and dehumidification, through the moisture absorption zone 401 for adsorption, and through the condenser 5 for heating before flowing into the drying chamber 1, achieving a complete two-stage dehumidification path under strict control. This structure allows the dryer to flexibly adjust the airflow path at different drying stages, meeting the comprehensive balance requirements between adsorption efficiency, energy management, and drying speed. In some examples of this application, the switch 14 adopts a rotary opening and closing switching structure.

[0036] This switching mechanism not only enables the equipment to adapt to the drying needs of different fabric materials and different moisture contents, but also significantly improves the stability, intelligence and energy efficiency of the drying equipment during operation. The switching switch has a simple and reliable structure, good compatibility with the existing air circuit system, and does not increase the complexity of control. It brings a good user experience while improving dehumidification efficiency.

[0037] As a preferred example of this application, temperature sensors are respectively installed on the air inlet and air outlet sides of the second air duct 7 to detect the air inlet temperature T1 and air outlet temperature T2 of the second air duct 7, and to control the start / stop state of the auxiliary heat source 10 or the auxiliary heat source 10 and the auxiliary cold source 11 based on the detection results. In the example of this application, a first temperature sensor is installed in the second air duct 7 near the first air inlet 8, and a second temperature sensor is installed in the second air duct 7 near the first air outlet 12. The first temperature sensor is used to detect the temperature T1 of the external fresh air introduced through the first air inlet 8 in real time, and the second temperature sensor is used to monitor the temperature T2 of the air that has passed through the dehumidification zone 402 and is about to be discharged to the external environment through the first air outlet 12. The system control module will determine whether the current heat state of the dehumidification zone meets the requirements for efficient dehumidification based on the acquired temperature data of T1 and T2, thereby realizing intelligent control of the start / stop state of the auxiliary heat source 10 and / or the auxiliary cold source 11. When T1 is lower than the start-up temperature threshold set by the device, the system determines that the heat carried by the fresh air itself is insufficient. If the humidity is insufficient to support the full evaporation of moisture from the dehumidifier, the controller sends a signal to activate the auxiliary heat source 10 and the auxiliary cold source 11. At this time, the auxiliary heat source 10 and the fresh air entering the second air duct 7 work together to dehumidify the dehumidifier 4. During the operation of the auxiliary heat source 10, if the auxiliary heat source 10 continues to heat and causes T2 to exceed the set temperature safety threshold, the system will automatically shut down the auxiliary heat source 10 and the auxiliary cold source 11 to prevent overheating of the dehumidification zone from causing aging of the dehumidification material or structural damage to the dehumidifier. In addition, if the T1 detection value is already higher than the temperature value required for heating, the system will no longer activate the auxiliary heat source 10, but will make full use of the heat of the fresh air itself for dehumidification. This cyclical control ensures that the dehumidification process always operates within a temperature range that is both efficient and safe, improving dehumidification performance while also taking into account energy saving and equipment lifespan.

[0038] This application also discloses a control method for a closed-loop heat pump dryer with auxiliary heat source for deep dehumidification, including: Preset first temperature threshold T 阈1 Second temperature threshold T 阈2 T 阈1 T 阈2 T is the dehumidification temperature parameter set based on the rotary dehumidification material. 阈1 ≤T 阈2 ; The inlet air temperature T1 and outlet air temperature T2 of the second air duct 7 are detected, where T1 is the temperature of the incoming fresh air and T2 is the temperature of the outgoing dehumidified air. When T1 < T 阈1When the auxiliary heat source 10 is turned on, or the auxiliary heat source 10 and the auxiliary cold source 11 are turned on simultaneously, the auxiliary heat source 10 heats the fresh air entering the second air duct 7 and flows to the dehumidification zone 402 for regeneration, and the auxiliary cold source 11 cools the dehumidified air when the exhaust temperature is higher than the set threshold; otherwise, the auxiliary heat source 10 is turned off directly, or the auxiliary heat source 10 and the auxiliary cold source 11 are turned off simultaneously, so that the fresh air entering the second air duct 7 regenerates the dehumidification zone 402 alone. During the activation of auxiliary heat source 10, when T2≥T 阈2 When the auxiliary heat source 10 is turned off, or the auxiliary heat source 10 and the auxiliary cold source 11 are turned off at the same time, the fresh air entering the second air duct 7 is used to regenerate the dehumidification zone 402 separately.

[0039] The auxiliary heat source deep dehumidification closed-loop heat pump dryer control method described in this application, such as Figure 2 As shown, its operating mechanism is based on real-time sensing and comparison of the temperatures on both sides of the second air duct 7, realizing dynamic adjustment and closed-loop temperature feedback control of the operating status of the auxiliary heat source 10 and the auxiliary cold source 11. When the ambient temperature is low, the auxiliary heat source 10 is activated in time to supplement the temperature, ensuring that the dehumidification zone 402 of the rotor reaches the temperature required for regeneration, thereby improving the regeneration efficiency of the rotor dehumidification material and avoiding a decrease in dehumidification capacity due to insufficient temperature. When the fresh air temperature meets the dehumidification requirements, the auxiliary heat source 10 is automatically shut off, thereby effectively reducing energy consumption and improving energy utilization. On this basis, through real-time monitoring of the outlet air temperature of the dehumidification zone 402, heating is immediately stopped when the temperature reaches the set safety threshold to prevent the rotor dehumidification material from being damaged due to excessive temperature. To prevent failure, deformation, or aging, and extend the service life of core components, the introduction of auxiliary cold source 11 effectively controls high-temperature exhaust, avoiding safety hazards to the equipment casing, operating environment, or users. This control strategy adapts to different climatic conditions and ambient temperatures, maintaining stable equipment operation in both low-temperature winter and high-temperature summer environments, ensuring an optimal balance between drying efficiency, dehumidification capacity, and component lifespan. Furthermore, this method is simple in structure, clear in logic, and fast in response, allowing for modular expansion or upgrades by embedding it into existing heat pump drying control systems. It achieves intelligent energy-saving goals without relying on complex sensor arrays or advanced algorithms, providing a reliable technical foundation for the intelligent operation, refined control, and long-term stability of heat pump drying systems. In some examples of this application, the auxiliary heat source 10 and auxiliary cold source 11 are controlled as a whole, simultaneously turning on or off; that is, when the auxiliary heat source 10 is turned on, the auxiliary cold source 11 is simultaneously turned on, and when the auxiliary heat source 10 is turned off, the auxiliary cold source 11 is simultaneously turned off. In the examples of this application, T... 阈1 The value range is 35~45℃, T 阈2 The value range is 80~120℃.

[0040] As a preferred example of this application, the auxiliary heat source 10 is one or more combinations of an electric heating device, a hot water heat exchanger, or a steam heat exchanger, and the auxiliary cold source 11 is a water-cooled heat exchanger or a semiconductor refrigeration device. When a semiconductor refrigeration device is used as the auxiliary cold source 11, its hot end can be used as the auxiliary heat source 10 for heating. In the example of this application, the auxiliary heat source 10 can be an electric heating device, a hot water heat exchanger, or a steam heat exchanger, and the auxiliary cold source 11 is a water-cooled heat exchanger or a semiconductor refrigeration device, making the equipment more suitable for various energy supply conditions and installation environments. The auxiliary cold source 11 can be flexibly set according to usage requirements. In terms of control strategy, the integrated control of the auxiliary heat source 10 and the auxiliary cold source 11 simplifies the control logic, eliminating the need to set the start and stop conditions for each separately, making operation more convenient, reducing the complexity of the control program, and avoiding the coordination problem that may occur when one is turned on but the other does not respond in time when controlled separately, ensuring... The stability of their coordinated operation has been verified. When auxiliary heating for dehumidification is required, both start simultaneously, ensuring the temperature required for dehumidification and timely cooling of the treated air. This prevents the discharge of high-temperature, high-humidity air from affecting the environment or equipment, thus improving operational reliability. When no auxiliary heating is needed, both shut off simultaneously, avoiding energy waste and improving energy efficiency. When the temperature in the dehumidification zone is too high, shutting off both simultaneously can quickly stop the heat source input, preventing damage to the rotary dehumidification material due to overheating and extending the equipment's service life. This coordinated mode makes the dehumidification process smoother, further improving drying efficiency and user experience.

[0041] As a preferred example of this application, during the drying process, the return air temperature T of the drying chamber 1 is continuously monitored and acquired. out ; If T is detected continuously for n seconds out ≤T 阈3 Then turn on the switch 14 on the bypass ventilation duct 13; If T is detected continuously for n seconds out ≥T 阈4 Then turn off the switch 14 on the bypass ventilation duct 13; Where n is the preset detection time, T 阈3 T 阈4 This is a preset temperature parameter set based on the clothes drying stage, and T 阈3 <T 阈4 .

[0042] The auxiliary heat source deep dehumidification closed-loop heat pump dryer control method described in this application further introduces an intelligent control mechanism for the bypass ventilation duct 13, such as... Figure 3 As shown, the return air temperature T is obtained in real time by a return air temperature sensor installed at the return air inlet in the drying chamber 1. out And combined with the preset detection time n and temperature threshold T 阈3 With T 阈4This enables automatic switching control of the on / off state of bypass ventilation duct 13, where T 阈3 The criterion for determining when the return air temperature is low is T. 阈4 Set as the upper limit temperature threshold for when enhanced dehumidification is required, when temperature T is continuously monitored for n seconds. out ≤T 阈3 When the control system automatically turns on the switching switch 14 on the bypass ventilation duct 13, some of the return air bypasses the evaporator 3 and directly enters the moisture absorption zone 401 of the rotary dehumidifier 4 to accelerate heating and improve moisture absorption efficiency. When T is continuously detected for n seconds... out ≥T 阈4 When the system shuts off switch 14, all return air flows through evaporator 3 for thorough cooling and dehumidification. This control logic allows the return air path to adaptively switch under different temperature and humidity conditions, improving overall drying efficiency and system energy efficiency. Here, n can be set to 60 seconds, and T... 阈3 The value range is 30~40℃, T 阈4 The value range is 50~60℃, which ensures both response sensitivity and avoids system malfunctions caused by instantaneous temperature fluctuations.

[0043] This application constructs a dual-channel dehumidification structure with a closed-loop circulation duct 2 (main duct) and a second duct 7 (auxiliary duct) operating in parallel. In the main duct, an evaporator 3, a moisture absorption zone 401 of a rotary dehumidifier 4, and a condenser 5 are sequentially arranged to form a stable and efficient dry airflow circulation path. In the auxiliary duct, a dehumidification zone 402 of the rotary dehumidifier 4 and an auxiliary heat source 10 are arranged, with optional auxiliary cold source 11 and / or a second fan 9 to achieve continuous regeneration of the rotary dehumidifier material. This structural design makes the humid air drier after dual dehumidification treatment, thereby improving drying efficiency. Simultaneously, separating the dehumidification process and the rotary dehumidification process into different ducts avoids airflow interference and heat waste, improving the working efficiency of each module. The auxiliary heat source 10 heats the fresh air to provide the heat required for rotary dehumidification, combined with the auxiliary cold source... Eleven exhaust ducts are used for cooling and dehumidification, creating a continuous regenerative airflow cycle of "heating-dehumidification-cooling" to improve the regeneration rate of the rotor and optimize exhaust quality. In addition, a bypass duct 13 is introduced to allow airflow to bypass the evaporator 3 and reach the moisture absorption zone 401 directly, improving thermal efficiency and adsorption effect at specific stages. Its opening and closing are controlled by temperature thresholds and time parameters, forming a controllable segmented dehumidification path in combination with the main air duct. The overall solution is also supplemented by temperature sensor sensing and control methods, which determine whether to turn on the auxiliary heat source 10 and auxiliary cold source 11 based on the temperature of the fresh air inlet and outlet, and dynamically switch the opening and closing status of the bypass duct 13 by monitoring the return air temperature in real time. This achieves intelligent adjustment of the operation of each dehumidification path and heat source, improving drying efficiency while reducing energy consumption and operating load, and enhancing the equipment's adaptability and operational stability in changing environments.

[0044] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A closed-loop heat pump dryer with auxiliary heat source for deep dehumidification, characterized in that, include: Drying chamber (1) is used to hold clothes to be dried and to exchange heat and moisture; A closed-loop air duct (2) is connected to the drying chamber (1) and is used to circulate and transport dry air. The heat pump system includes an evaporator (3) and a condenser (5) arranged sequentially in the closed-loop air duct (2). The evaporator (3) is used to cool and dehumidify the air flowing out of the drying chamber (1), and the condenser (5) is used to heat the dehumidified air in the closed-loop air duct (2). The first fan (6) is used to drive the air in the closed circulation duct (2) to circulate between the drying chamber (1) and the closed circulation duct (2) in the direction of sequential flow toward the evaporator (3), condenser (5) and drying chamber (1); The rotary dehumidifier (4) includes a moisture absorption zone (401) and a dehumidification zone (402). The moisture absorption zone (401) is located in a closed-loop air duct (2) and between the evaporator (3) and the condenser (5). The second air duct (7) has a first air inlet (8) at one end that connects to the external environment and a first air outlet (12) at the other end that discharges into the environment. The dehumidification zone (402) is located in the second air duct (7). An auxiliary heat source (10) is set in the second air duct (7) and located between the first air inlet (8) and the dehumidification zone (402) to heat the fresh air introduced into the second air duct (7) and provide the heat required for the dehumidification of the rotary wheel.

2. The closed-loop heat pump dryer with auxiliary heat source for deep dehumidification according to claim 1, characterized in that, The second air duct (7) is provided with an auxiliary cold source (11), which is located between the dehumidification zone (402) and the first air outlet (12) and is used to cool the air discharged after dehumidification.

3. The closed-loop heat pump dryer with auxiliary heat source for deep dehumidification according to claim 1 or 2, characterized in that, A second fan (9) is installed in the second air duct (7). The second fan (9) is used to guide fresh air from the external environment through the first air inlet (8), the auxiliary heat source (10), the dehumidification zone (402) and discharge it through the first air outlet (12).

4. The closed-loop heat pump dryer with auxiliary heat source for deep dehumidification according to claim 3, characterized in that, Temperature sensors are installed on the air inlet and air outlet sides of the second air duct (7) to detect the air inlet temperature T1 and air outlet temperature T2 of the second air duct (7), and control the start and stop status of the auxiliary heat source (10) or the auxiliary heat source (10) and auxiliary cold source (11) based on the detection results.

5. The closed-loop heat pump dryer with auxiliary heat source for deep dehumidification according to claim 1, 2, or 4, characterized in that, A bypass ventilation duct (13) is provided in the closed-loop air duct (2). One end of the bypass ventilation duct (13) is connected to the air inlet side of the evaporator (3), and the other end is connected to the air inlet side of the moisture absorption zone (401). The bypass ventilation duct (13) is used to allow some of the return air in the closed-loop air duct (2) to pass over the evaporator (3) and directly enter the moisture absorption zone (401) of the rotary dehumidifier (4) for adsorption and dehumidification.

6. The closed-loop heat pump dryer with auxiliary heat source for deep dehumidification according to claim 5, characterized in that, A switching switch (14) is provided in the closed-loop air duct (2) and / or the bypass air duct (13) for switching the on and off of the bypass air duct (13).

7. The closed-loop heat pump dryer with auxiliary heat source for deep dehumidification according to claim 6, characterized in that, A third temperature sensor for detecting the return air temperature is installed at the air outlet of the drying chamber (1), and the switching switch (14) is controlled based on the detection result to adjust the on / off state of the bypass ventilation duct (13).

8. The closed-loop heat pump dryer with auxiliary heat source for deep dehumidification according to claim 2, characterized in that, The auxiliary heat source (10) is one or more of an electric heating device, a hot water heat exchanger or a steam heat exchanger, and the auxiliary cold source (11) is a water-cooled heat exchanger or a semiconductor refrigeration device.

9. A control method for a closed-loop heat pump dryer with auxiliary heat source for deep dehumidification, characterized in that, The dryer with auxiliary heat source deep dehumidification closed-loop heat pump as described in any one of claims 1 to 8 includes: Preset first temperature threshold T 阈1 Second temperature threshold T 阈2 T 阈1 T 阈2 T is the dehumidification temperature parameter set based on the rotary dehumidification material. 阈1 ≤T 阈2 ; The inlet air temperature T1 and outlet air temperature T2 of the second air duct (7) are detected, where T1 is the temperature of the incoming fresh air and T2 is the temperature of the dehumidified air discharged. When T1 < T 阈1 When the auxiliary heat source (10) is turned on, or the auxiliary heat source (10) and the auxiliary cold source (11) are turned on simultaneously, the auxiliary heat source (10) heats the fresh air entering the second air duct (7) and flows to the dehumidification zone (402) for rotational regeneration, and the auxiliary cold source (11) cools the dehumidified air; otherwise, the auxiliary heat source (10) is turned off, or the auxiliary heat source (10) and the auxiliary cold source (11) are turned off simultaneously, so that the fresh air entering the second air duct (7) alone rotates and regenerates the dehumidification zone (402); During the activation of the auxiliary heat source (10), when T2≥T 阈2 When the auxiliary heat source (10) is turned off, or the auxiliary heat source (10) and auxiliary cold source (11) are turned off at the same time, the fresh air entering the second air duct (7) is used to regenerate the dehumidification zone (402) separately.

10. The control method for a closed-loop heat pump dryer with auxiliary heat source deep dehumidification according to claim 9, characterized in that, During the drying process, the return air temperature T of the drying chamber (1) is continuously monitored and acquired. out ; If T is detected continuously for n seconds out ≤T 阈3 If the switching switch (14) on the bypass ventilation duct (13) is turned on, some of the return air will bypass the evaporator (3) and directly enter the moisture absorption zone (401) of the rotary dehumidifier (4). If T is detected continuously for n seconds out ≥T 阈4 If the switch (14) on the bypass ventilation duct (13) is closed, all return air will flow through the evaporator (3) for cooling and dehumidification. Where n is the preset detection time, T 阈3 T 阈4 This is a preset temperature parameter set based on the clothes drying stage, and T 阈3 <T 阈4 .

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