Drying system based on waste heat recovery and intelligent end point control and working method thereof

Abstract

The invention discloses a drying system based on waste heat recovery and intelligent end point control and a working method of the drying system. The drying system comprises a compressor, a condenser, a heat regenerator, a throttling valve, an evaporator, an air heat exchanger and a roller which are connected with a control module. An outlet of the compressor is connected with an inlet on one side of the condenser, an outlet on one side of the condenser is connected with a hot end inlet of the heat regenerator, an outlet of the hot end of the heat regenerator is connected with the throttling valve, the throttling valve is connected with an inlet on one side of the evaporator, an outlet on one side of the evaporator is connected with a cold end inlet of the heat regenerator, and an outlet of the cold end of the heat regenerator is connected with an inlet of the compressor. An outlet in one side of the air heat exchanger is connected with an inlet in the other side of the condenser, an outlet in the other side of the condenser is connected with the roller, the roller is connected with an inlet in the other side of the air heat exchanger, and an outlet in the other side of the air heat exchanger is connected with a drainage pipe. Multi-stage waste heat full utilization is achieved, the energy utilization efficiency is improved, and the problem that drying is not thorough is solved.

Description

Technical Field

[0001] The present invention belongs to the field of household appliances, and in particular to a drying system based on waste heat recovery and intelligent end control and its working method. Background Art

[0002] In today's fast-paced life, the washing and drying integrated machine has gradually become an essential household appliance for many families due to its convenient feature of integrating washing and drying functions. However, delving into the actual performance of the current washing and drying integrated machines on the market during the drying process, it will be found that there are a series of problems that urgently need to be solved. These problems not only affect the user experience but also cause a certain degree of energy waste and environmental burden to some extent. The following problems exist in the current washing and drying integrated machines on the market during the drying process: Waste heat waste: In the traditional drying method, during the drying process, the heating device continuously operates, generating a large amount of heat energy to evaporate the moisture in the clothes. After the drying is completed and the heating device stops running, there is still a considerable amount of high-temperature waste heat remaining in the cavity, and a large amount of waste heat fails to be fully utilized, resulting in serious energy waste. False drying of clothes: During the drying process, although the machine stops the drying program after detecting that the moisture content on the surface of the clothes reaches a certain level, after the drying stops, due to the problem of residual moisture, there may still be a certain amount of moisture inside the clothes or deep in the fibers. When the drying is over, the moisture in the surrounding environment will gradually penetrate into the clothes, making the seemingly dry clothes re-absorb moisture. Condensation effect: During the drying process, the cavity is filled with high-temperature water vapor. As the drying program ends and the heating device stops working, the temperature of the cavity gradually decreases. When the drying stops and the cavity temperature drops, the water vapor in the cavity will condense when it meets the cold, forming liquid water. Part of these condensed waters may accumulate at the bottom of the cavity, and the other part may directly condense on the surface of the clothes. When the surface of the clothes adheres to condensed water, the clothes will become wet again, and the previous drying effect will be greatly reduced. Low energy efficiency: The heat energy in different stages is not effectively utilized during the drying process, resulting in a long drying time and high power consumption. In different stages of drying, the clothes have different requirements for heat energy. For example, at the initial stage of drying, the clothes have a high water content and require a large amount of heat energy to quickly evaporate the moisture; while at the later stage of drying, the water content of the clothes gradually decreases, and the required heat energy also decreases accordingly. However, most of the current washing and drying integrated machines on the market lack an intelligent heat energy distribution and adjustment system and cannot accurately provide an appropriate amount of heat energy according to the actual state of the clothes and the requirements in different stages during the drying process. This leads to insufficient heat energy supply at the initial stage of drying and slow drying speed; while at the later stage of drying, there may be an excess of heat energy, resulting in energy waste. In addition, in order to pursue the drying effect, some washing and drying integrated machines often use a higher drying temperature and a longer drying time, which not only increases the power consumption but also may cause damage to the clothes, such as causing the clothes to shrink, deform, fade, etc.

[0003] Therefore, there is an urgent need for a new drying system that can efficiently utilize waste heat, improve the control accuracy of the drying end point, and avoid secondary moisture absorption of clothes, so as to enhance the drying efficiency, energy-saving effect and user experience. Summary of the Invention

[0004] The purpose of the present invention is to provide a drying system based on waste heat recovery and intelligent end point control and its working method, so as to solve the problems of secondary moisture absorption of clothes and low energy efficiency in the existing drying process.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A drying system based on waste heat recovery and intelligent end point control includes a compressor, a condenser, a regenerator, a throttle valve, an evaporator, an air heat exchanger, a drum and a control module; The outlet of the compressor is connected to the inlet of one side of the condenser, the outlet of one side of the condenser is connected to the inlet of the hot end of the regenerator, the outlet of the hot end of the regenerator is connected to the throttle valve, the throttle valve is connected to the inlet of one side of the evaporator, the outlet of one side of the evaporator is connected to the inlet of the cold end of the regenerator, the outlet of the cold end of the regenerator is connected to the inlet of the compressor, the inlet of the other side of the evaporator is connected to an air pump, the outlet of the other side of the evaporator is connected to the inlet of one side of the air heat exchanger, the outlet of one side of the air heat exchanger is connected to the inlet of the other side of the condenser, the outlet of the other side of the condenser is connected to the drum, the drum is connected to the inlet of the other side of the air heat exchanger, and the outlet of the other side of the air heat exchanger is connected to a drain pipe; The compressor, the condenser, the regenerator, the throttle valve, the evaporator, the air pump and the air heat exchanger are all connected to the control module.

[0006] Furthermore, a first electric valve is installed on the fluid pipeline between the outlet of the compressor and the inlet of one side of the condenser, a first solenoid valve and a second solenoid valve are installed on the fluid pipeline between the outlet of one side of the condenser and the inlet of the hot end of the regenerator, and the first electric valve, the first solenoid valve and the second solenoid valve are all connected to the control module.

[0007] Furthermore, a refrigerant pump is installed on the fluid pipeline between the outlet of the hot end of the regenerator and the throttle valve, a third solenoid valve is installed on the fluid pipeline between the throttle valve and the inlet of one side of the evaporator, and the refrigerant pump and the third solenoid valve are all connected to the control module.

[0008] Furthermore, a fourth solenoid valve is installed on the fluid pipeline between the outlet of one side of the evaporator and the inlet of the cold end of the regenerator, a fifth solenoid valve and a third electric valve are installed on the fluid pipeline between the outlet of the cold end of the regenerator and the inlet of the compressor, and the fourth solenoid valve, the fifth solenoid valve and the third electric valve are all connected to the control module.

[0009] Further, the inlet on the other side of the evaporator is connected to an air pipeline, and a first regulating valve, a first temperature and humidity sensor, and an air pump are sequentially installed on the air pipeline. Both the first regulating valve and the first temperature and humidity sensor are connected to the control module.

[0010] Further, a sixth solenoid valve and a seventh solenoid valve are respectively installed on the pipelines of the inlet and outlet on the other side of the evaporator. Both the sixth solenoid valve and the seventh solenoid valve are connected to the control module.

[0011] Further, a second regulating valve is installed on the fluid pipeline between the outlet on one side of the air heat exchanger and the inlet on the other side of the condenser. A second electric valve is installed on the fluid pipeline between the outlet on the other side of the condenser and the drum. A second temperature and humidity sensor and a third regulating valve are installed on the fluid pipeline between the drum and the inlet on the other side of the air heat exchanger. The second regulating valve, the second electric valve, the second temperature and humidity sensor, and the third regulating valve are all connected to the control module.

[0012] Further, a ventilation valve is installed on the drain pipe, and the ventilation valve is connected to the control module.

[0013] A working method of the drying system based on waste heat recovery and intelligent end point control described above includes: The control module starts the compressor to operate, compresses the low-temperature and low-pressure refrigerant vapor from the evaporator into a high-temperature and high-pressure state and flows into the condenser, where it exchanges heat with the dry air output from the air heat exchanger and condenses into a medium-temperature and high-pressure liquid to enter the regenerator. After counter-current heat exchange with the low-temperature and low-pressure refrigerant vapor from the evaporator, it is throttled and depressurized by the throttle valve and enters the evaporator to complete the gasification and endothermic cycle, thereby realizing the closed-loop of the heat pump cycle. In the evaporator, the refrigerant exchanges heat with the ambient air introduced from the air pipeline by the air pump and evaporates into low-temperature and low-pressure refrigerant vapor. At the same time, the air is cooled and dehumidified. The dehumidified air coming out of the evaporator enters the air heat exchanger and exchanges heat with the high-temperature and high-humidity air discharged during the drum drying process. The high-temperature dry air is discharged from the outlet of the air heat exchanger, enters the condenser again to exchange heat with the high-temperature and high-pressure refrigerant, and is heated to the target temperature to form a high-temperature dry air flow, which is sent into the drum to dry and dehumidify the clothes. The moisture and heat released by the clothes in the drum are mixed to form high-temperature and high-humidity air and are discharged from the drum. After exchanging heat with the previously dried and dehumidified air through the air heat exchanger, the temperature is reduced, water vapor is condensed, and is discharged through the drain pipe.

[0014] Further, the control module realizes the clothes drying process by dynamically adjusting the operating power and compression temperature of the compressor. The drying process includes an efficient evaporation stage, a constant temperature drying stage, a waste heat slow drying stage, and a temperature and humidity balance stage.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a drying system based on waste heat recovery and intelligent end-point control. By connecting the outlet of the compressor to the inlet of one side of the condenser, the outlet of one side of the air heat exchanger to the inlet of the other side of the condenser, and the outlet of the other side of the condenser to the drum, the condenser is used to exchange heat between the high-temperature and high-pressure refrigerant and the dry air output by the air heat exchanger. After releasing heat, it condenses into a medium-temperature and high-pressure liquid refrigerant, and at the same time, high-temperature dry air is generated and enters the drum to dry the clothes. Connect the outlet of one side of the condenser to the inlet of the hot end of the regenerator, and the outlet of the hot end of the regenerator to the throttle valve. After the refrigerant is throttled and depressurized by the throttle valve, it becomes a low-temperature and low-pressure liquid refrigerant. The throttle valve is connected to the inlet of one side of the evaporator, the outlet of one side of the evaporator is connected to the inlet of the cold end of the regenerator, and the inlet of the other side of the evaporator is connected to an air pump. The evaporator is used to exchange heat between the refrigerant and the ambient air. After absorbing heat, it evaporates into a low-temperature and low-pressure refrigerant vapor, and at the same time, the air is cooled and dehumidified, significantly reducing the moisture content of the air. Connect the outlet of the cold end of the regenerator to the inlet of the compressor. The cold end and the hot end of the regenerator exchange heat with each other to form a heat absorption cycle of the refrigerant. The outlet of the other side of the evaporator is connected to the inlet of one side of the air heat exchanger, and the drum is connected to the inlet of the other side of the air heat exchanger. The air heat exchanger is used to exchange heat between the dehumidified air and the high-temperature and high-humidity air discharged from the drum, raising the temperature of the dry air and lowering the temperature of the high-temperature and high-humidity air. The outlet of the other side of the air heat exchanger is connected to a drain pipe to discharge the condensed water vapor from the high-temperature and high-humidity air with reduced temperature. The present invention realizes high-efficiency energy saving, uniform drying, and prevents the clothes from getting rehumidified through technologies such as multi-stage waste heat recovery, intelligent temperature and humidity control, staged cooling and drying, and intelligent air duct optimization. The present invention utilizes a multi-stage waste heat recovery device, which can efficiently recover and utilize the heat in the drying process, realize a heat pump cycle closed-loop, reduce heat loss, effectively reduce the overall energy consumption of the system, and improve the drying efficiency and energy utilization rate. By integrating waste heat recovery, intelligent ventilation, and dynamic drying control technologies, the drying process is made more efficient and energy-saving, and the final dry state of the clothes can be controlled more precisely. At the same time, the intelligent ventilation system ensures that the moisture after drying can be quickly and safely discharged, preventing the clothes from getting reabsorbed with moisture. The present invention is applicable to washing and drying integrated machines, independent dryers, and industrial drying equipment, which can significantly improve the user experience and the comprehensive utilization rate of drying equipment.

[0016] The present invention also provides a working method for a drying system based on waste heat recovery and intelligent end-point control. By exchanging heat between a refrigerant and dry air, and then reversely exchanging heat with low-temperature and low-pressure refrigerant vapor, a heat pump cycle closed-loop is realized. Then, environmental air is exchanged with the refrigerant to form dry air, which exchanges heat with the high-temperature and high-humidity air discharged during the drum drying process, enters the condenser and is heated to the target temperature again by exchanging heat with high-temperature and high-pressure refrigerant, forming a high-temperature dry air flow, which is sent into the drum to dry and dehumidify the clothes, forming a circulating heat exchange mode, and realizing the full recovery and utilization of the multi-stage waste heat generated during the drying process. This multi-stage waste heat recovery method can maximize the capture and utilization of the heat that would otherwise be wasted, greatly improving the energy utilization efficiency, reducing energy loss, and effectively reducing the energy consumption of the drying system. At the same time, through the intelligent drying mode in stages, combined with the intelligent adjustment of the temperature and humidity sensor + wind speed, the drying end-point is dynamically optimized to avoid the problems of over-drying or incomplete drying. In addition, the micro-airflow adsorption drying technology is adopted to further reduce the residual humidity in the drying chamber, so that the clothes can maintain a dry state for a long time after drying. The present invention realizes high-efficiency energy saving, uniform drying, and prevents the clothes from re-moistening through technologies such as multi-stage waste heat recovery, intelligent temperature and humidity control, staged cooling and drying, and intelligent air duct optimization.

[0017] Further, the system intelligently adjusts the working states of each part through a number of control valves and sensors, ensuring efficient and stable operation in different drying modes, and providing customized drying solutions adaptable to different clothing materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic diagram of the working mode of the drying system based on waste heat recovery and intelligent end-point control of the present invention.

[0020] Figure 2 It is a flow chart of the intelligent staged drying of the drying system based on waste heat recovery and intelligent end-point control of the present invention.

[0021] Wherein: 1 - compressor, 2 - first electric valve, 3 - condenser, 4 - first solenoid valve, 5 - second solenoid valve, 6 - regenerator, 7 - refrigerant pump, 8 - throttle valve, 9 - third solenoid valve, 10 - evaporator, 11 - fourth solenoid valve, 12 - fifth solenoid valve, 13 - first regulating valve, 14 - first temperature and humidity sensor, 15 - air pump, 16 - sixth solenoid valve, 17 - seventh solenoid valve, 18 - air heat exchanger, 19 - second regulating valve, 20 - second electric valve, 21 - drum, 22 - second temperature and humidity sensor, 23 - third regulating valve, 24 - ventilation valve, 25 - third electric valve. Detailed implementation manners

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0024] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention. In addition, terms such as "first", "second", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0026] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0027] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if the terms "set", "installed", "connected", and "connected" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0028] The present invention will be further described in detail below with reference to the accompanying drawings: See Figure 1 , the present invention provides a drying system based on waste heat recovery and intelligent end-point control, including a compressor 1, a condenser 3, a regenerator 6, a refrigerant pump 7, a throttle valve 8, an evaporator 10, an air pump 15, an air heat exchanger 18, a drum 21, and a number of control valves and sensor devices, all of which are connected to a control module and centrally scheduled through the control module to achieve dynamic optimization control of the entire drying process.

[0029] The outlet of the compressor 1 is connected to the inlet of one side of the condenser 3. A first electric valve 2 is installed on the fluid pipeline between the outlet of the compressor 1 and the inlet of one side of the condenser 3. The outlet of one side of the condenser 3 is connected to the inlet of the hot end of the regenerator 6. A first solenoid valve 4 and a second solenoid valve 5 are installed on the fluid pipeline between the outlet of one side of the condenser 3 and the inlet of the hot end of the regenerator 6. The outlet of the hot end of the regenerator 6 is connected to the throttle valve 8. A refrigerant pump 7 is installed on the fluid pipeline between the outlet of the hot end of the regenerator 6 and the throttle valve 8. The throttle valve 8 is connected to the inlet of one side of the evaporator 10. A third solenoid valve 9 is installed on the fluid pipeline between the throttle valve 8 and the inlet of one side of the evaporator 10. The outlet of one side of the evaporator 10 is connected to the inlet of the cold end of the regenerator 6. A fourth solenoid valve 11 is installed on the fluid pipeline between the outlet of one side of the evaporator 10 and the inlet of the cold end of the regenerator 6. The outlet of the cold end of the regenerator 6 is connected to the inlet of the compressor 1. A fifth solenoid valve 12 and a third electric valve 25 are installed on the fluid pipeline between the outlet of the cold end of the regenerator 6 and the inlet of the compressor 1. The inlet of the other side of the evaporator 10 is connected to an air pipeline. A first regulating valve 13, a first temperature and humidity sensor 14, and an air pump 15 are successively installed on the air pipeline. A sixth solenoid valve 16 and a seventh solenoid valve 17 are respectively installed on the pipelines of the inlet and the outlet of the other side of the evaporator 10. The outlet of the other side of the evaporator 10 is connected to the inlet of one side of the air heat exchanger 18. The outlet of one side of the air heat exchanger 18 is connected to the inlet of the other side of the condenser 3. A second regulating valve 19 is installed on the fluid pipeline between the outlet of one side of the air heat exchanger 18 and the inlet of the other side of the condenser 3. The outlet of the other side of the condenser 3 is connected to the drum 21. A second electric valve 20 is installed on the fluid pipeline between the outlet of the other side of the condenser 3 and the drum 21. The drum 21 is connected to the inlet of the other side of the air heat exchanger 18. A second temperature and humidity sensor 22 and a third regulating valve 23 are installed on the fluid pipeline between the drum 21 and the inlet of the other side of the air heat exchanger 18. The outlet of the other side of the air heat exchanger 18 is connected to a drain pipe. A ventilation valve 24 is installed on the drain pipe.

[0030] The working method of the drying system based on waste heat recovery and intelligent end point control of the present invention includes: After the control module starts the compressor 1 to run, the low-temperature and low-pressure refrigerant vapor from the evaporator 10 is compressed into a high-temperature and high-pressure state, and then flows into the condenser 3, where it exchanges heat with the dry air output by the air heat exchanger 18, releases heat and condenses into a medium-temperature and high-pressure liquid refrigerant. This medium-temperature and high-pressure liquid refrigerant is guided into the regenerator 6 through the first solenoid valve 4 and the second solenoid valve 5, is further subcooled after counter-flow heat exchange with the low-temperature and low-pressure refrigerant vapor from the evaporator 10, and then is throttled and depressurized by the throttle valve 8 to become a low-temperature and low-pressure liquid refrigerant, which is guided into the evaporator 10 through the third solenoid valve 9. In the evaporator 10, the refrigerant exchanges heat with the ambient air introduced from the air pipeline by the air pump 15, absorbs heat and evaporates into a low-temperature and low-pressure refrigerant vapor, is guided into the regenerator 6 through the fourth solenoid valve 11 for heat exchange, and then is guided into the compressor 1 through the fifth solenoid valve 12 to complete the gasification and endothermic cycle, thus realizing the closed-loop of the heat pump cycle.

[0031] In the regenerator 6, the medium-temperature and high-pressure liquid refrigerant exchanges heat with the low-temperature and low-pressure refrigerant vapor from the evaporator 10. Through this process, the refrigerant is further cooled, the subcooling degree of the liquid refrigerant before entering the throttle valve 8 is increased, and thus the throttling efficiency is improved.

[0032] In the evaporator 10, the refrigerant exchanges heat with the ambient air, and at the same time cools and dehumidifies the air, significantly reducing the moisture content of the air. The dehumidified air coming out of the evaporator 10 is guided by the seventh solenoid valve 17 into the air heat exchanger 18, where it exchanges heat with the high-temperature and high-humidity air discharged from the drum 21 to increase its temperature; the high-temperature and dry air coming out of the outlet of the air heat exchanger 18 enters the condenser 3, and is heated to the target temperature after exchanging heat with the high-temperature and high-pressure refrigerant again, forming a high-temperature and dry air flow, which is sent into the drum 21 to dry and dehumidify the clothes.

[0033] During the drying process, the moisture and heat released by the clothes are mixed to form high-temperature and high-humidity air, which is discharged from the drum 21 through the exhaust air duct and exchanges heat with the previously dried and dehumidified air through the air heat exchanger 18 to reduce the temperature. Part of the water vapor condenses and precipitates, and is discharged from the system through the drain pipe, thus effectively recovering heat, reducing energy consumption, and improving the comprehensive energy efficiency ratio (COP) of the system.

[0034] In addition, the first temperature and humidity sensor 14 and the second temperature and humidity sensor 22 set in the system can monitor the temperature and humidity parameters in the system in real time. The control unit can adjust the operating states of the throttle valve 8, the solenoid valve group, the electric valve group, the regulating valve group, the refrigerant pump 7 and the air pump 15 according to the detected data, further optimize the air flow organization and heat distribution during the drying process, and realize precise drying with intelligent and multi-stage control.

[0035] The control module of the present invention realizes intelligent phased control during the clothing drying process through precise adjustment of the compression temperature and power of the compressor 1, combined with sensor feedback and waste heat utilization of the regenerator 6, such as Figure 2 shown, including the following four stages: (I) High-efficiency evaporation stage In this stage, the compressor 1 operates at a high power, and the compression temperature is set at about 50-60°C. The high-temperature and high-pressure refrigerant exchanges heat with air through the condenser 3 to generate high-temperature and dry air, which is sent into the drum 21 to quickly evaporate the moisture on the surface of the clothing. The control module monitors the humidity data of the second temperature and humidity sensor 22 at the outlet of the drum 21. When the humidity drops to about 60%, it automatically enters the next stage.

[0036] (II) Constant-temperature drying stage The control module controls the compressor 1 to operate at medium power, and the compression temperature is stabilized between 45-55°C to maintain a constant medium-temperature drying environment. The condenser 3 continues to supply dry air, which enters the drum 21 to stably evaporate the moisture inside the clothing. The control module fine-tunes the power of the compressor 1 according to the real-time feedback of the second temperature and humidity sensor 22 to ensure temperature and humidity stability. When it is monitored that the humidity drops to about 40%-45%, the system switches to the next stage.

[0037] (III) Waste heat slow-drying stage The control module controls the compressor 1 to further reduce the power and maintain operation in the low-temperature range of about 30-35°C. The regenerator 6 is started to recover the waste heat of the refrigerant discharged from the condenser 3 and transfer it to the low-pressure refrigerant gas to increase its enthalpy value before entering the compressor 1 and reduce the load of the compressor 1. In this stage, the air in the drum 21 is continuously and slowly heated at low power to completely evaporate the remaining moisture. When the current humidity is lower than 30%, the system enters the final stage.

[0038] (IV) Temperature and humidity balance stage When the humidity of the clothing reaches the set drying target, the system enters the temperature and humidity balance stage. The first temperature and humidity sensor 14 and the second temperature and humidity sensor 22 are used to continuously monitor the temperature and humidity inside the drum 21 and the outdoor environment. The control module adjusts the compressor 1 to operate at the lowest power, and controls the compression temperature to enter the fine balance area. At the same time, the ventilation valve 24 is opened to make the air inside and outside the drum 21 circulate, realizing the dynamic balance of the temperature and humidity in the cavity environment and preventing the clothing from absorbing moisture and getting damp again. After balance confirmation, the compressor 1 is turned off and the ventilation valve 24 is closed, and the entire drying process ends.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A drying system based on waste heat recovery and intelligent end point control, characterized in that, It includes a compressor, a condenser, a regenerator, a throttle valve, an evaporator, an air heat exchanger, a drum and a control module; The outlet of the compressor is connected to the inlet of one side of the condenser, the outlet of one side of the condenser is connected to the inlet of the hot end of the regenerator, the outlet of the hot end of the regenerator is connected to the throttle valve, the throttle valve is connected to the inlet of one side of the evaporator, the outlet of one side of the evaporator is connected to the inlet of the cold end of the regenerator, the outlet of the cold end of the regenerator is connected to the inlet of the compressor, the inlet of the other side of the evaporator is connected to an air pump, the outlet of the other side of the evaporator is connected to the inlet of one side of the air heat exchanger, the outlet of one side of the air heat exchanger is connected to the inlet of the other side of the condenser, the outlet of the other side of the condenser is connected to the drum, the drum is connected to the inlet of the other side of the air heat exchanger, and the outlet of the other side of the air heat exchanger is connected to a drain pipe; The compressor, the condenser, the regenerator, the throttle valve, the evaporator, the air pump and the air heat exchanger are all connected to the control module.

2. The drying system based on waste heat recovery and intelligent end point control according to claim 1, wherein A first electric valve is installed on the fluid pipeline between the outlet of the compressor and the inlet of one side of the condenser, a first solenoid valve and a second solenoid valve are installed on the fluid pipeline between the outlet of one side of the condenser and the inlet of the hot end of the regenerator, and the first electric valve, the first solenoid valve and the second solenoid valve are all connected to the control module.

3. The drying system based on waste heat recovery and intelligent end point control according to claim 1, characterized in that, A refrigerant pump is installed on the fluid pipeline between the outlet of the hot end of the regenerator and the throttle valve, a third solenoid valve is installed on the fluid pipeline between the throttle valve and the inlet of one side of the evaporator, and the refrigerant pump and the third solenoid valve are all connected to the control module.

4. The drying system based on waste heat recovery and intelligent end point control according to claim 1, characterized in that, A fourth solenoid valve is installed on the fluid pipeline between the outlet of one side of the evaporator and the inlet of the cold end of the regenerator, a fifth solenoid valve and a third electric valve are installed on the fluid pipeline between the outlet of the cold end of the regenerator and the inlet of the compressor, and the fourth solenoid valve, the fifth solenoid valve and the third electric valve are all connected to the control module.

5. The drying system based on waste heat recovery and intelligent end point control according to claim 1, wherein, The inlet of the other side of the evaporator is connected to an air pipeline, and a first regulating valve, a first temperature and humidity sensor and an air pump are sequentially installed on the air pipeline. The first regulating valve and the first temperature and humidity sensor are both connected to the control module.

6. The drying system based on waste heat recovery and intelligent end-point control according to claim 1, wherein, A sixth solenoid valve and a seventh solenoid valve are respectively installed on the pipelines of the inlet and outlet of the other side of the evaporator, and the sixth solenoid valve and the seventh solenoid valve are both connected to the control module.

7. The drying system based on waste heat recovery and intelligent end point control according to claim 1, wherein A second regulating valve is installed on the fluid pipeline between the outlet of one side of the air heat exchanger and the inlet of the other side of the condenser, a second electric valve is installed on the fluid pipeline between the outlet of the other side of the condenser and the drum, and a second temperature and humidity sensor and a third regulating valve are installed on the fluid pipeline between the drum and the inlet of the other side of the air heat exchanger. The second regulating valve, the second electric valve, the second temperature and humidity sensor and the third regulating valve are all connected to the control module.

8. The drying system based on waste heat recovery and intelligent end point control according to claim 1, characterized in that A ventilation valve is installed on the drain pipe, and the ventilation valve is connected to the control module.

9. A working method of the drying system based on waste heat recovery and intelligent end point control according to any one of claims 1 to 8, characterized in that, It includes: The control module starts the compressor to run, compresses the low-temperature and low-pressure refrigerant vapor from the evaporator into a high-temperature and high-pressure state and flows into the condenser, exchanges heat with the dry air output by the air heat exchanger and then condenses into a medium-temperature and high-pressure liquid and enters the regenerator, exchanges heat reversely with the low-temperature and low-pressure refrigerant vapor from the evaporator, and then throttles and depressurizes through the throttle valve and enters the evaporator to complete the gasification and endothermic cycle, so as to realize the closed loop of the heat pump cycle; In the evaporator, the refrigerant exchanges heat with the ambient air introduced from the air pipeline by the air pump and then evaporates into refrigerant vapor at low temperature and low pressure. At the same time, the air is cooled and dehumidified. The dehumidified air coming out of the evaporator enters the air heat exchanger and exchanges heat with the high-temperature and high-humidity air discharged during the drum drying process. The high-temperature dry air is discharged from the outlet of the air heat exchanger, enters the condenser, and is heated to the target temperature after exchanging heat with the high-temperature and high-pressure refrigerant again, forming a high-temperature dry air stream, which is sent into the drum to dry and dehumidify the clothes. The moisture and heat released by the clothes in the drum are mixed to form high-temperature and high-humidity air, which is discharged from the drum. After exchanging heat with the previously dried and dehumidified air through the air heat exchanger, the temperature is reduced, water vapor is condensed, and is discharged through the drain pipe.

10. The working method of the drying system based on waste heat recovery and intelligent end point control according to claim 9, characterized in that, The control module realizes the clothes drying process by dynamically adjusting the operating power and compression temperature of the compressor. The drying process includes an efficient evaporation stage, a constant temperature drying stage, a residual heat slow drying stage, and a temperature and humidity balance stage.

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