A heat pump clothes dryer and system, control method, storage medium

Abstract

The present application relates to a kind of heat pump clothes dryer and system, control method, storage medium, the method includes the following steps: when heat pump clothes dryer enters washing stage, by controlling water supply valve to guide on passage between inlet pipeline and condenser, by controlling throttle valve to cut off passage between condenser and evaporator, by controlling electric air valve to switch the air duct of evaporator, make evaporator work in outer circulation mode;When heat pump clothes dryer enters drying stage, by controlling circulating water pump and water supply valve to cut off passage between inlet pipeline and condenser, by controlling throttle valve to guide on passage between condenser and evaporator, by controlling electric air valve to switch the air duct of evaporator, make evaporator work in inner circulation mode.The present application cancels the conventional water heater, and make full use of the high energy efficiency of heat pump system Cold heat, into the condenser cold water, with high temperature coolant steam heat exchange, heating washing water, provide for clothes washing, reduce the consumption of electric energy, more efficient energy saving.

Description

Technical Field

[0001] This invention relates to the field of heat pump dryer technology, and particularly to a heat pump dryer and system, control method, and storage medium. Background Technology

[0002] A clothes dryer is a household appliance that uses electric heating to instantly evaporate the moisture from washed clothes. It is especially useful in northern winters and in the humid, rainy seasons of the south where clothes are difficult to dry. In addition, clothes dryers are widely used in industrial production to dry fabrics and improve production efficiency.

[0003] In dryers, heat pump technology is the most efficient way to save energy during the drying process, and therefore it has been widely used. Currently, heat pump dryers heat the cold water entering the drum through an electric water heater during the washing stage to improve washing performance, but this method consumes a relatively large amount of energy. Summary of the Invention

[0004] In order to achieve the above-mentioned objectives and other advantages of the present invention, a first objective of the present invention is to provide a control method for a heat pump dryer system, comprising the following steps:

[0005] When the heat pump dryer enters the washing stage, the water supply valve is controlled to open the passage between the water inlet pipe and the condenser, the throttle valve is controlled to cut off the passage between the condenser and the evaporator, and the electric air valve is controlled to switch the air duct of the evaporator, so that the evaporator works in the external circulation mode.

[0006] When the heat pump dryer enters the drying stage, the circulation water pump and water supply valve are controlled to cut off the passage between the water inlet pipe and the condenser, the throttle valve is controlled to open the passage between the condenser and the evaporator, and the electric air valve is controlled to switch the air duct of the evaporator, so that the evaporator works in the internal circulation mode.

[0007] Furthermore, when the heat pump dryer enters the washing stage, it also includes the step of: controlling the circulating water pump to open the passage between the water inlet pipe and the condenser.

[0008] Furthermore, when the heat pump dryer enters the washing stage, the control of the water supply valve and the control of the circulating water pump include the following steps:

[0009] By controlling the opening of the circulating water pump and the water supply valve, the passage between the water inlet pipe and the condenser is opened;

[0010] The water supply valve and the circulating water pump are adjusted according to the material of the clothing and the monitored temperature of the washing water inside the drum.

[0011] Furthermore, the adjustment of the water supply valve and the circulating water pump based on the material of the clothing and the monitored washing water temperature inside the drum includes the following steps:

[0012] Match the corresponding washing water temperature by obtaining the material information of the clothing;

[0013] When the monitored washing water temperature inside the drum is lower than the matched washing water temperature, the opening degree of the water supply valve is reduced and / or the speed of the circulating water pump is increased.

[0014] When the monitored washing water temperature inside the drum is higher than the matched washing water temperature, the opening degree of the water supply valve is increased and / or the speed of the circulating water pump is decreased.

[0015] Furthermore, the step of switching the evaporator's air duct by controlling the electric air valve to make the evaporator operate in external circulation mode includes the following steps:

[0016] By controlling the opening of the external circulation air valve and the closing of the internal circulation air valve, the air duct of the evaporator is switched, so that the evaporator works in external circulation mode;

[0017] When the monitored washing water temperature inside the drum is lower than the matched washing water temperature, the opening degree of the external circulation air valve is increased.

[0018] When the monitored washing water temperature inside the drum is higher than the matched washing water temperature, the opening degree of the external circulation air valve is reduced.

[0019] Furthermore, when the heat pump dryer enters the drying stage, the control throttle valve includes the following steps:

[0020] By controlling the opening of the throttle valve, the passage between the condenser and the evaporator is opened;

[0021] The opening degree of the throttle valve is adjusted according to the material of the clothing and the monitored temperature and humidity of the clothing.

[0022] Furthermore, the step of switching the evaporator's air duct by controlling the electric air valve to make the evaporator operate in internal circulation mode includes the following steps:

[0023] By controlling the external circulation air valve to close and the internal circulation air valve to open, the air duct of the evaporator is switched, so that the evaporator works in internal circulation mode.

[0024] When the monitored humidity of the clothes reaches the humidity corresponding to the current period of the drying stage, the opening degree of the internal circulation air valve is maintained or reduced.

[0025] If the detected humidity of the clothes does not reach the humidity corresponding to the current period of the drying stage, and the detected temperature of the clothes reaches the temperature corresponding to the current period of the drying stage, then the opening degree of the internal circulation air valve is maintained or reduced; if the detected temperature of the clothes does not reach the temperature corresponding to the current period of the drying stage, then the opening degree of the internal circulation air valve is increased.

[0026] Furthermore, the step of switching the evaporator's air duct by controlling the electric air valve to make the evaporator operate in internal circulation mode includes the following steps:

[0027] By controlling the external circulation air valve to close and the internal circulation air valve to open, the air duct of the evaporator is switched, so that the evaporator works in internal circulation mode.

[0028] When the detected humidity of the clothes does not reach the humidity corresponding to the current period of the drying stage, the opening degree of the internal circulation air valve is increased;

[0029] When the monitored humidity of the clothes reaches the humidity corresponding to the current period of the drying stage, the opening degree of the internal circulation air valve is maintained or reduced.

[0030] A second objective of this invention is to provide a computer-readable storage medium having program instructions stored thereon, which, when executed, implement a control method for a heat pump dryer system.

[0031] A third objective of this invention is to provide a heat pump dryer system, comprising: a compressor, a condenser, a throttling valve, an evaporator, a water supply valve, an electric air valve, and a controller. The compressor's exhaust pipe is connected to the condenser's inlet, the condenser's outlet is connected to the evaporator's inlet via the throttling valve, the evaporator's outlet is connected to the compressor's suction pipe, the water supply valve is connected in series on the water inlet pipe, the water inlet pipe is connected to the condenser's water inlet, the condenser's water outlet is connected to the drum via a pipe, the electric air valve is connected to the evaporator, and the controller is used to execute a control method for the aforementioned heat pump dryer system.

[0032] Furthermore, it also includes a circulating water pump connected in series on the inlet pipe, and the circulating water pump is located upstream of the water supply valve on the inlet pipe.

[0033] Furthermore, the electric air valve includes an internal circulation air valve and an external circulation air valve, which are connected to the evaporator.

[0034] A fourth objective of this invention is to provide a heat pump dryer, comprising a dryer body and a heat pump dryer system disposed within the dryer body.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] This invention provides a heat pump dryer and system, control method, and storage medium. It eliminates the conventional water heater and makes full use of the high-efficiency heating and cooling capacity of the heat pump system. Cold water is injected into the condenser to exchange heat with high-temperature refrigerant vapor, heating the washing water and providing it to the clothes for washing, thus reducing electricity consumption and making it more efficient and energy-saving.

[0037] This invention controls the washing water temperature by adjusting the water supply valve, circulating water pump, and external circulation air valve to meet the washing needs of clothing made of different materials. It also controls the humidity at different stages of the drying process by adjusting the throttle valve and internal circulation air valve to meet the drying needs of clothing made of different materials.

[0038] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail below with reference to the accompanying drawings. Attached Figure Description

[0039] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0040] Figure 1 This is a schematic diagram of a heat pump dryer system according to Example 1;

[0041] Figure 2 This is a flowchart of a control method for a heat pump dryer system according to Example 3;

[0042] Figure 3 This is a flowchart illustrating the control of the water supply valve and circulating water pump when the heat pump dryer enters the washing stage, as shown in Example 3.

[0043] Figure 4 The flowchart for the throttle valve control when the heat pump dryer enters the drying stage is shown in Example 3.

[0044] Figure 5 This is a schematic diagram of the electronic device in Example 4;

[0045] Figure 6 This is a block diagram of the computer-readable storage medium in Example 5.

[0046] In the attached diagram: 1. Compressor; 2. Condenser; 3. Throttling valve; 4. Evaporator; 5. Drum; 6. Water supply valve; 7. Circulating water pump; 8. Internal circulation air valve; 9. External circulation air valve. Detailed Implementation

[0047] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0048] Example 1

[0049] A heat pump dryer system, such as Figure 1 As shown, the system includes: a compressor 1, a condenser 2, a throttling valve 3, an evaporator 4, a water supply valve 6, an electric air valve, and a controller. The discharge pipe of the compressor 1 is connected to the inlet of the condenser 2. The outlet of the condenser 2 is connected to the inlet of the evaporator 4 via the throttling valve 3. The outlet of the evaporator 4 is connected to the suction pipe of the compressor 1. The water supply valve 6 is connected in series on the water inlet pipe, which is connected to the water inlet of the condenser 2. The water outlet of the condenser 2 is connected to the drum 5 via a pipe. The electric air valve is connected to the evaporator 4. The electric air valve includes an internal circulation air valve 8 and an external circulation air valve 9, both of which are connected to the evaporator. The controller is used to execute the control method of the heat pump dryer system. A detailed description of the control method of the heat pump dryer system can be found in the corresponding description in the following method embodiments.

[0050] In order to circulate and heat the washing water in the drum 5, the heat pump dryer system also includes a circulating water pump 7, which is connected in series on the water inlet pipe and is located upstream of the water supply valve 6.

[0051] The water supply valve 6, circulating water pump 7, condenser 2, compressor 1, and evaporator 4 form a water heating circulation loop. When the heat pump dryer enters the washing stage, it relies on the air source heat pump to provide hot water, sharing compressor 1 and evaporator 4 with the refrigerant circuit. The high-temperature refrigerant from compressor 1 is introduced into condenser 2 for condensation and heat release. Cold water is then pumped into condenser 2 through circulating water pump 7 and water supply valve 6, exchanging heat with the high-temperature refrigerant vapor to heat the water temperature for washing clothes. At the same time, by closing the internal circulation air valve 8 and opening the external circulation air valve 9, the air duct of evaporator 4 is switched, allowing evaporator 4 to operate in external circulation mode, ensuring the normal operation of the heat pump system and the washing system.

[0052] When the washing is completed and the drying stage begins, the water heating circulation loop is closed due to the shut-off of the water supply valve 6 and the circulating water pump 7. The condenser 2 switches to air-cooled mode, and the evaporator 4 air duct switches to internal circulation mode through the internal circulation air valve 8, which is basically the same as a conventional internal circulation heat pump dryer.

[0053] The refrigerant circuit consists of compressor 1, condenser 2, expansion valve 3, and evaporator 4. Compressor 1 pressurizes and heats the refrigerant, which is then sent to condenser 2 to release heat. Condenser 2 is connected to the airflow inside the dryer, outputting hot, dry air. The refrigerant then enters expansion valve 3 from condenser 2. Expansion valve 3 is the transition point between high and low pressure; after passing through this component, the pressure and temperature drop rapidly. The refrigerant then enters evaporator 4 from expansion valve 3, rapidly reducing pressure and temperature, absorbing heat energy, and reaching a temperature below the dew point. Evaporator 4 is connected to the drying airflow, transforming the humid, hot air into dry, cool air. Water vapor from the clothes condenses into small water droplets here and is collected in the condensation tray.

[0054] Condenser 2 and evaporator 4 form an air circulation loop. The drying fan sends the hot air heated by condenser 2 into drum 5, where the clothes are heated and tumbled, accelerating the evaporation of moisture into water vapor (humid hot air). The drying filter captures lint, debris, etc., from the clothes, which then enters evaporator 4. There, the moisture in the clothes condenses into small droplets, becoming dry, cool air, which then returns to condenser 2. The water vapor from the clothes is collected in a drip tray. A drain pump pumps the condensate from the drip tray to a higher position, where it is sent to a storage tank. This process is repeated until the humidity sensor determines that the moisture content of the clothes has reached the set target, at which point the drying process ends.

[0055] The present invention provides a heat pump dryer system that eliminates the conventional water heater and makes full use of the high energy efficiency of the heat pump system, making it more efficient and energy-saving.

[0056] Example 2

[0057] A heat pump dryer includes a dryer body and a heat pump dryer system disposed within the dryer body. A detailed description of the heat pump dryer system can be found in the corresponding description in the above system embodiments, and will not be repeated here.

[0058] Example 3

[0059] The control method corresponding to the heat pump dryer system in Example 1 is as follows: Figure 2 As shown, it includes the following steps:

[0060] When the heat pump dryer enters the washing stage, the water supply valve is controlled to open the passage between the water inlet pipe and the condenser, the throttle valve is controlled to cut off the passage between the condenser and the evaporator, and the electric air valve is controlled to switch the air duct of the evaporator, so that the evaporator works in the external circulation mode, ensuring the normal operation of the heat pump system and the washing system.

[0061] To circulate and heat the washing water inside the drum 5, a circulating water pump 7 is connected in series on the water inlet pipe. When the heat pump dryer enters the washing stage, it is also necessary to control the circulating water pump to open the passage between the water inlet pipe and the condenser.

[0062] like Figure 3 As shown, when the heat pump dryer enters the washing stage, the control process of the water supply valve and the circulating water pump includes the following steps:

[0063] By controlling the opening of the circulating water pump and water supply valve, the passage between the water inlet pipe and the condenser is opened, cold water is flushed into the condenser to exchange heat with the high-temperature refrigerant vapor, and the water temperature is heated to provide for washing clothes.

[0064] Different fabrics require different washing temperatures; excessively high temperatures can cause deformation and fading. To better care for garments, the water supply valve and circulation pump need to be adjusted based on the fabric material and the monitored water temperature inside the drum to provide washing water at the required temperature. Specifically, this includes the following steps:

[0065] Match the corresponding washing water temperature by obtaining the material information of the clothing;

[0066] The temperature sensor monitors the washing water temperature inside the drum. When the monitored washing water temperature inside the drum is lower than the matched washing water temperature, the opening degree of the water supply valve is reduced and / or the speed of the circulating water pump is increased. Reducing the opening degree of the water supply valve reduces the water output and increases the water temperature; increasing the speed of the circulating water pump increases the rate of washing water circulation and heating, thus increasing the water temperature.

[0067] When the monitored washing water temperature inside the drum is higher than the matched washing water temperature, the opening degree of the water supply valve is increased and / or the speed of the circulating water pump is decreased. Increasing the opening degree of the water supply valve increases the water output and lowers the water temperature; decreasing the speed of the circulating water pump reduces the rate of washing water circulation and heating, thus lowering the water temperature.

[0068] Combining the above-described control process of the water supply valve and circulating water pump, the steps to switch the evaporator's air duct by controlling the electric air valve to enable the evaporator to operate in external circulation mode include:

[0069] By controlling the opening of the external circulation air valve and the closing of the internal circulation air valve, the air duct of the evaporator is switched so that the evaporator works in external circulation mode, absorbs heat from the air, and prevents sensible heat waste.

[0070] When the monitored washing water temperature inside the drum is lower than the matched washing water temperature, the opening degree of the external circulation air valve is increased to increase the amount of air flowing into the evaporator in order to absorb more heat from the air.

[0071] When the monitored washing water temperature inside the drum is higher than the matched washing water temperature, the opening degree of the external circulation air valve is reduced to reduce the amount of air flowing into the evaporator, thereby reducing the heat absorbed from the air.

[0072] When the heat pump dryer enters the drying stage, the circulation water pump and water supply valve are controlled to cut off the passage between the water inlet pipe and the condenser. The throttle valve is controlled to open the passage between the condenser and the evaporator, that is, the condenser switches to air-cooled mode. The electric air valve is controlled to switch the air duct of the evaporator, so that the evaporator works in internal circulation mode, which is basically the same as a conventional internal circulation heat pump dryer.

[0073] like Figure 4 As shown, when the heat pump dryer enters the drying stage, the throttle valve control process includes the following steps:

[0074] By controlling the opening of the throttle valve, the passage between the condenser and the evaporator is opened;

[0075] Since different materials require different amounts of heat to dry, the opening degree of the throttle valve needs to be adjusted according to the material of the clothing and the monitored temperature and humidity to ensure drying effect and protect the clothing from damage. Specifically, this includes the following steps:

[0076] The material information of the clothing is obtained and matched with the corresponding drying parameters, including the temperature and humidity at different stages of the drying process. For example, the drying stages are set to include the early stage, middle stage and late stage. The temperature and humidity at the early stage, middle stage and late stage can be set according to actual needs, and no specific limitation is made here.

[0077] The humidity of the clothes is monitored by a humidity sensor to determine whether the detected humidity has reached the humidity level corresponding to the current stage of the drying process; for example, if the drying process is in its later stages, the system can determine whether the detected humidity has reached the humidity level corresponding to the later stages of the drying process.

[0078] If so, reduce the opening degree of the throttle valve to maintain the compressor discharge temperature at the current state;

[0079] Otherwise, the temperature of the clothes is monitored by a temperature sensor to determine whether the monitored temperature of the clothes has reached the temperature corresponding to the current stage of the drying process;

[0080] If so, reduce the opening degree of the throttle valve to maintain the compressor discharge temperature at the current state;

[0081] Otherwise, maintain or increase the opening of the throttle valve to continue heating and dehumidifying the clothes inside the drum.

[0082] By controlling humidity, the drying effect can be guaranteed; at the same time, the temperature during the drying process can be controlled to meet the drying needs of clothing of different materials.

[0083] Combining the above-described throttle valve control process, the following steps are taken to switch the evaporator's air duct by controlling the electric air valve to make the evaporator operate in internal circulation mode:

[0084] By controlling the external circulation damper to close and the internal circulation damper to open, the air duct of the evaporator is switched, so that the evaporator works in internal circulation mode.

[0085] When the monitored humidity of the clothes reaches the humidity corresponding to the current period of the drying stage, maintain or reduce the opening degree of the internal circulation air valve, maintain or reduce the air volume of the clothes in the heated drum, and maintain or reduce the refrigerant flow into the evaporator, maintain the current state, and proceed to the next operation normally.

[0086] If the detected humidity of the clothes does not reach the humidity corresponding to the current stage of the drying process, but the detected temperature of the clothes reaches the temperature corresponding to the current stage of the drying process, the opening degree of the internal circulation air valve is maintained or reduced to keep the compressor exhaust temperature at the current level. If the detected temperature of the clothes does not reach the temperature corresponding to the current stage of the drying process, the opening degree of the internal circulation air valve is increased to increase the amount of air for heating the clothes in the drum and to increase the refrigerant flow into the evaporator in order to speed up the drying of the clothes and reduce the humidity of the clothes.

[0087] Example 4

[0088] An electronic device 200, such as Figure 5 As shown, the system includes, but is not limited to: a memory 201 storing program code; and a processor 202 connected to the memory, which, when executed by the processor, implements a control method for a heat pump dryer system. For a detailed description of the method, please refer to the corresponding description in the above method embodiments, which will not be repeated here.

[0089] Example 5

[0090] A computer-readable storage medium, such as Figure 6 As shown, it stores program instructions, which, when executed, implement a control method for a heat pump dryer system. For a detailed description of the method, please refer to the corresponding description in the above method embodiments; it will not be repeated here.

[0091] Example 6

[0092] A computer program product includes a computer program / instructions that, when executed by a processor, implement a control method for a heat pump dryer system. A detailed description of the method can be found in the corresponding descriptions in the above method embodiments, and will not be repeated here.

[0093] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0094] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0095] The above are merely embodiments of this specification and are not intended to limit the scope of the one or more embodiments herein. For those skilled in the art, various modifications and variations can be made to the one or more embodiments of this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the one or more embodiments of this specification should be included within the scope of the claims of the one or more embodiments of this specification.

Claims

1. A control method for a heat pump dryer system, characterized in that, Includes the following steps: When the heat pump dryer enters the washing stage, the water supply valve is controlled to open the passage between the water inlet pipe and the condenser, the throttle valve is controlled to cut off the passage between the condenser and the evaporator, and the electric air valve is controlled to switch the air duct of the evaporator, so that the evaporator works in the external circulation mode. When the heat pump dryer enters the drying stage, the circulation water pump and water supply valve are controlled to cut off the passage between the water inlet pipe and the condenser, the throttle valve is controlled to open the passage between the condenser and the evaporator, and the electric air valve is controlled to switch the air duct of the evaporator, so that the evaporator works in the internal circulation mode. When the heat pump dryer enters the washing stage, the following steps are also included: controlling the circulating water pump to open the passage between the water inlet pipe and the condenser. When the heat pump dryer enters the washing stage, the control of the water supply valve and the control of the circulating water pump include the following steps: By controlling the opening of the circulating water pump and the water supply valve, the passage between the water inlet pipe and the condenser is opened; The water supply valve and the circulating water pump are adjusted according to the material of the clothing and the monitored temperature of the washing water inside the drum. The method of adjusting the water supply valve and the circulating water pump based on the material of the clothing and the monitored washing water temperature inside the drum includes the following steps: Match the corresponding washing water temperature by obtaining the material information of the clothing; When the monitored washing water temperature inside the drum is lower than the matched washing water temperature, the opening degree of the water supply valve is reduced and / or the speed of the circulating water pump is increased. When the monitored washing water temperature inside the drum is greater than the matched washing water temperature, the opening degree of the water supply valve is increased and / or the speed of the circulating water pump is decreased. When the heat pump dryer enters the drying stage, the control throttle valve includes the following steps: By controlling the opening of the throttle valve, the passage between the condenser and the evaporator is opened; The opening degree of the throttle valve is adjusted by the material of the clothing and the monitored temperature and humidity of the clothing. The method of adjusting the opening degree of the throttle valve based on the material of the clothing and the monitored temperature and humidity of the clothing includes the following steps: By matching the material information of the clothing with the corresponding drying parameters, the drying parameters include the temperature and humidity corresponding to different stages of the drying process; Determine whether the monitored humidity of the clothes has reached the humidity level corresponding to the current period of the drying stage; If so, reduce the opening degree of the throttle valve to maintain the compressor discharge temperature at the current state; Otherwise, determine whether the monitored temperature of the clothes has reached the temperature corresponding to the current stage of the drying process; If so, reduce the opening degree of the throttle valve to maintain the compressor discharge temperature at the current state; Otherwise, maintain or increase the opening degree of the throttle valve.

2. The control method for a heat pump dryer system according to claim 1, characterized in that, The step of switching the evaporator's air duct by controlling the electric air valve to make the evaporator operate in external circulation mode includes the following steps: By controlling the opening of the external circulation air valve and the closing of the internal circulation air valve, the air duct of the evaporator is switched, so that the evaporator works in external circulation mode; When the monitored washing water temperature inside the drum is lower than the matched washing water temperature, the opening degree of the external circulation air valve is increased. When the monitored washing water temperature inside the drum is higher than the matched washing water temperature, the opening degree of the external circulation air valve is reduced.

3. The control method for a heat pump dryer system according to claim 1, characterized in that: The step of switching the evaporator's air duct by controlling the electric air valve to make the evaporator operate in internal circulation mode includes the following steps: By controlling the external circulation air valve to close and the internal circulation air valve to open, the air duct of the evaporator is switched, so that the evaporator works in internal circulation mode. When the monitored humidity of the clothes reaches the humidity corresponding to the current period of the drying stage, the opening degree of the internal circulation air valve is maintained or reduced. If the detected humidity of the clothes does not reach the humidity corresponding to the current period of the drying stage, and the detected temperature of the clothes reaches the temperature corresponding to the current period of the drying stage, then the opening degree of the internal circulation air valve is maintained or reduced; if the detected temperature of the clothes does not reach the temperature corresponding to the current period of the drying stage, then the opening degree of the internal circulation air valve is increased.

4. A computer-readable storage medium, characterized in that, It stores program instructions that, when executed, implement the method as described in any one of claims 1 to 3.

5. A heat pump clothes dryer system, characterized in that, include: The system comprises a compressor, a condenser, a throttling valve, an evaporator, a water supply valve, an electric air valve, and a controller. The compressor's exhaust pipe is connected to the condenser's inlet. The condenser's outlet is connected to the evaporator's inlet via the throttling valve. The evaporator's outlet is connected to the compressor's suction pipe. The water supply valve is connected in series on the water inlet pipe, which is connected to the condenser's water inlet. The condenser's water outlet is connected to the drum via a pipe. The electric air valve is connected to the evaporator. The controller is used to execute the control method of a heat pump dryer system as described in claim 1.

6. A heat pump clothes dryer system according to claim 5, characterized in that: It also includes a circulating water pump, which is connected in series on the inlet pipe and is located upstream of the water supply valve on the inlet pipe.

7. A heat pump clothes dryer system according to claim 5, characterized in that: The electric air valve includes an internal circulation air valve and an external circulation air valve, which are connected to the evaporator.

8. A heat pump clothes dryer, characterized in that: Includes a dryer body and a heat pump dryer system as described in any one of claims 5 to 7 disposed within the dryer body.

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