A heat pump clothes dryer and two-stage dehumidification system, control method, and storage medium

Abstract

The present application relates to a kind of heat pump clothes dryer and two-stage dehumidification system, control method, storage medium, the method includes the following steps: judging the current drying stage of drying process;Obtain the drying strategy corresponding to current drying stage;The opening of first throttling valve and second throttling valve is controlled by the drying strategy obtained;If the drying parameter value collected reaches the target value in the drying strategy corresponding to current drying stage, enter the next drying stage, control in next drying stage, until complete all drying process.The present application, in different drying stages, different operating modes are selected for energy efficiency optimization, the purpose of realizing drying efficiency zoning control is achieved, the energy consumption of drying process is reduced, and drying efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of heat pump dryer technology, and particularly to a heat pump dryer, a two-stage dehumidification system, a control method, and a 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 clothes dryers, heat pump technology is the most efficient way to save energy during the drying process, and therefore it has been widely used. Currently, in the drying stage, heat pump dryers use the evaporator of the heat pump system to dehumidify and cool the humid air at the drum outlet, turning it into dry, cool air. This dry, cool air is then heated by the condenser to become the required dry, hot air before entering the drum for drying. However, existing solutions cannot achieve optimal energy efficiency in the drying stage, resulting in high energy consumption and relatively low drying efficiency. 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 two-stage dehumidification system of a heat pump dryer, comprising the following steps:

[0005] Determine the current drying stage of the drying process;

[0006] Obtain the drying strategy corresponding to the current drying stage;

[0007] The opening degree of the first and second throttle valves is controlled by the obtained drying strategy;

[0008] If the collected drying parameter values ​​reach the target values ​​in the drying strategy corresponding to the current drying stage, then proceed to the next drying stage and control the next drying stage until the entire drying process is completed.

[0009] Furthermore, determining the current drying stage of the drying process includes the following steps:

[0010] Obtain the collected humidity values ​​of the clothing and / or the running time of the drying process;

[0011] Determine whether the collected clothing humidity value and / or the drying process running time have reached the preset value for the later stage of drying;

[0012] Otherwise, the current drying stage of the drying process is determined to be the early drying stage;

[0013] If so, the current drying stage of the drying process is determined to be the later stage of drying.

[0014] Furthermore, the drying strategy corresponding to the early stage of drying is to control the first throttle valve to throttle and control the second throttle valve to be fully open;

[0015] The drying strategy corresponding to the later stage of drying is to control the first throttle valve to be fully open and control the second throttle valve to throttle.

[0016] Furthermore, controlling the opening degree of the first and second throttle valves based on the acquired drying strategy includes the following steps:

[0017] When the current drying stage of the drying process is the early drying stage, the first throttle valve is controlled to throttle, and the second throttle valve is controlled to be fully open.

[0018] When the current drying stage of the drying process is the later stage of drying, the first throttle valve is fully opened and the second throttle valve is throttled.

[0019] Furthermore, the target value in the drying strategy corresponding to the pre-drying stage includes a target humidity value;

[0020] The target values ​​in the drying strategy corresponding to the later stage of drying include the target temperature value.

[0021] Furthermore, if the collected drying parameter values ​​reach the target values ​​in the drying strategy corresponding to the current drying stage, then proceed to the next drying stage and control the next drying stage until the entire drying process is completed, including the following steps:

[0022] When the current drying stage of the drying process is the early drying stage, the humidity value of the clothes is collected;

[0023] Determine whether the collected humidity value of the clothes has reached the target humidity value in the drying strategy corresponding to the early stage of drying;

[0024] Otherwise, increase the opening degree of the first throttle valve, control the second throttle valve to be fully open, and jump to the point where the current drying stage of the drying process is the early drying stage, and collect the humidity value of the clothes;

[0025] Then it enters the later stage of drying, and the control of the later stage of drying is carried out;

[0026] When the current drying stage of the drying process is the later stage of drying, the temperature value of the clothes is collected;

[0027] Determine whether the collected clothing temperature value has reached the target temperature value in the corresponding drying strategy in the later stage of drying;

[0028] Otherwise, control the first throttle valve to be fully open, increase the opening degree of the second throttle valve, and jump to the point where the current drying stage of the drying process is the later stage of drying, and collect the temperature value of the clothes;

[0029] If yes, proceed to the next step.

[0030] Furthermore, the target value in the drying strategy corresponding to the later stage of drying also includes the target humidity value;

[0031] If the collected drying parameter values ​​reach the target values ​​in the drying strategy corresponding to the current drying stage, then proceed to the next drying stage and control the next drying stage until the entire drying process is completed. This process also includes the following steps:

[0032] When the current drying stage of the drying process is the later stage of drying, the humidity value of the clothes is collected;

[0033] Determine whether the collected humidity value of the clothes has reached the target humidity value in the corresponding drying strategy in the later stage of drying;

[0034] Otherwise, the temperature value of the clothes is collected, and it is determined whether the collected temperature value of the clothes reaches the target temperature value in the drying strategy corresponding to the later stage of drying; otherwise, the first throttle valve is fully opened, the opening degree of the second throttle valve is increased, and the process jumps to the point where the current drying stage of the drying process is the later stage of drying, and the humidity value of the clothes is collected; if yes, the first throttle valve is kept fully open, the current opening degree of the second throttle valve is kept or decreased, and the process jumps to the point where the current drying stage of the drying process is the later stage of drying, and the humidity value of the clothes is collected.

[0035] If yes, proceed to the next step.

[0036] 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 two-stage dehumidification system of a heat pump dryer.

[0037] A third objective of this invention is to provide a two-stage dehumidification system for a heat pump dryer, comprising: a compressor, a condenser, a first throttling valve, a first evaporator, a second throttling valve, a second evaporator, and a controller. The exhaust pipe of the compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the first evaporator via the first throttling valve, the outlet of the first evaporator is connected to the inlet of the second evaporator via the second throttling valve, and the outlet of the second evaporator is connected to the suction pipe of the compressor. The controller is used to execute a control method for a two-stage dehumidification system for a heat pump dryer.

[0038] The fourth objective of this invention is to provide a heat pump dryer, comprising a dryer body and a two-stage dehumidification system for the heat pump dryer body disposed within the dryer body.

[0039] Compared with the prior art, the beneficial effects of the present invention are:

[0040] This invention provides a heat pump dryer, a two-stage dehumidification system, a control method, and a storage medium. Different operating modes are selected at different drying stages to achieve optimal energy efficiency. In the initial drying stage, when the moisture content of the clothes is at its highest, dehumidification efficiency is high. By controlling the first throttling valve to throttle and the second throttling valve to fully open, pre-cooling and dehumidification are performed simultaneously, maximizing the handling of the moisture load in the early stages of dehumidification. In the later drying stage, when the moisture content of the clothes is lower, dehumidification efficiency is relatively low. At this time, temperature has a greater impact on drying efficiency than humidity. By controlling the first throttling valve to fully open and the second throttling valve to throttle, the condenser area is increased, and the outlet air temperature is raised, achieving the purpose of zoned control of drying efficiency, reducing energy consumption in the drying process, and improving drying efficiency.

[0041] 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

[0042] 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:

[0043] Figure 1 This is a schematic diagram of a two-stage dehumidification system for a heat pump dryer, as shown in Example 1.

[0044] Figure 2 The control method flow of a two-stage dehumidification system for a heat pump dryer as described in Example 3 is as follows: Figure 1 ;

[0045] Figure 3 The control method flow of a two-stage dehumidification system for a heat pump dryer as described in Example 3 Figure 2 ;

[0046] Figure 4 This is a schematic diagram of the electronic device in Example 4;

[0047] Figure 5 This is a block diagram of the computer-readable storage medium in Example 5.

[0048] In the attached diagram: 1. Compressor; 2. Condenser; 3. First expansion valve; 4. First evaporator; 5. Second expansion valve; 6. Second evaporator; 7. Drum. Detailed Implementation

[0049] 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.

[0050] Example 1

[0051] A two-stage dehumidification system for a heat pump dryer, such as Figure 1 As shown, the system includes: a compressor 1, a condenser 2, a first throttling valve 3, a first evaporator 4, a second throttling valve 5, a second evaporator 6, 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 first evaporator 4 via the first throttling valve 3. The outlet of the first evaporator 4 is connected to the inlet of the second evaporator 6 via the second throttling valve 5. The outlet of the second evaporator 6 is connected to the suction pipe of the compressor 1. The controller is used to execute the control method of the two-stage dehumidification system of the heat pump dryer. For a detailed description of the control method of the two-stage dehumidification system of the heat pump dryer, please refer to the corresponding description in the following method embodiments.

[0052] The refrigerant circuit consists of compressor 1, condenser 2, first expansion valve 3, first evaporator 4, second expansion valve 5, and second evaporator 6. 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 enters first expansion valve 3 from condenser 2. First expansion valve 3 is the transition point between high and low pressure; after passing through this component, the pressure and temperature rapidly decrease. The refrigerant then enters first evaporator 4 from first expansion valve 3, and then enters second evaporator 6 via second expansion valve 5, rapidly reducing pressure and temperature, absorbing heat energy, and reaching a temperature below the dew point. Evaporator 6 is connected to the drying airflow, transforming the humid, hot air into dry, cold air. Water vapor from the clothes condenses into small water droplets here and is collected in the condensation tray.

[0053] The condenser 2, first evaporator 4, and second evaporator 6 form an air circulation loop. The drying fan sends hot air heated by the condenser 2 into the drum 7. The clothes inside the drum 7 are heated and tumbled, accelerating the evaporation of moisture into water vapor (humid hot air). The drying filter captures lint and debris from the clothes, which then enters the second evaporator 6 and the first evaporator 4. There, the moisture in the clothes condenses into small droplets, becoming dry, cool air, which continues to enter the 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.

[0054] This invention provides a two-stage dehumidification system for a heat pump dryer. Different operating modes are selected for optimal energy efficiency at different drying stages. For example, in the initial drying stage, when the moisture content of the clothes is at its highest, the dehumidification efficiency is high. Therefore, by controlling the first throttling valve 3 to throttle and the second throttling valve 5 to fully open, pre-cooling and dehumidification are performed simultaneously, maximizing the handling of the moisture load in the early stage of dehumidification. In the later drying stage, when the moisture content of the clothes is lower, the dehumidification efficiency is relatively low. At this time, temperature has a greater impact on drying efficiency than humidity. Therefore, by controlling the first throttling valve 3 to fully open and the second throttling valve 5 to throttle, the condenser area is increased, and the outlet air temperature is raised, achieving the purpose of zoned control of drying efficiency, resulting in greater efficiency and energy saving.

[0055] Example 2

[0056] A heat pump dryer includes a dryer body and a two-stage dehumidification system disposed within the dryer body. A detailed description of the two-stage dehumidification system can be found in the corresponding description in the above system embodiments, and will not be repeated here.

[0057] Example 3

[0058] Example 1 describes a control method for a two-stage dehumidification system in a heat pump dryer, such as... Figure 2 As shown, it includes the following steps:

[0059] To select different operating modes at different stages of the drying process and achieve optimal energy efficiency, it is first necessary to determine the current stage of the drying process; specifically, such as... Figure 3 As shown, it includes the following steps:

[0060] Obtain the collected humidity values ​​of the clothing and / or the running time of the drying process;

[0061] When the only parameter to be judged is the humidity value of the clothes, it is determined whether the collected humidity value of the clothes has reached the preset humidity value in the later stage of drying.

[0062] Otherwise, the current drying stage of the drying process is determined to be the early drying stage;

[0063] If so, the current drying stage of the drying process is determined to be the later stage of drying.

[0064] When the only parameter to be judged is the running time of the drying process, the judgment is made as to whether the running time of the drying process has reached the start time of the later stage of drying.

[0065] Otherwise, the current drying stage of the drying process is determined to be the early drying stage;

[0066] If so, the current drying stage of the drying process is determined to be the later stage of drying.

[0067] When the parameters to be judged include the humidity value of the clothes and the running time of the drying process, it is determined whether the collected humidity value of the clothes and the running time of the drying process have both reached the preset value for the later stage of drying.

[0068] Otherwise, the current drying stage of the drying process is determined to be the early drying stage;

[0069] If so, the current drying stage of the drying process is determined to be the later stage of drying.

[0070] Obtain the drying strategy corresponding to the current drying stage. Since the moisture content of the clothes is at its highest in the early stage of drying, the dehumidification efficiency is very high. Therefore, the drying strategy for the early stage of drying is to control the first throttle valve to throttle and control the second throttle valve to fully open, while simultaneously performing pre-cooling and dehumidification, so as to maximize the handling of moisture load in the early stage of dehumidification.

[0071] Since the moisture content is already low in the later stages of drying, the dehumidification efficiency is relatively low. At this point, temperature has a greater impact on drying efficiency than humidity. Therefore, the corresponding drying strategy for the later stages is to fully open the first throttle valve, throttle the second throttle valve, increase the condenser area, and raise the outlet air temperature. By dividing the drying process into early and late stages and setting corresponding drying strategies, the goal of zoned control of drying efficiency can be achieved.

[0072] The opening degree of the first and second throttle valves is controlled by the obtained drying strategy; wherein,

[0073] When the current drying stage of the drying process is the early drying stage, the first throttle valve is controlled to throttle, and the second throttle valve is controlled to be fully open.

[0074] When the current drying stage of the drying process is the later stage of drying, the first throttle valve is fully opened and the second throttle valve is throttled.

[0075] Collect drying parameter values ​​for the current drying stage during the drying process;

[0076] Determine whether the collected drying parameter values ​​have reached the target values ​​in the drying strategy corresponding to the current drying stage;

[0077] If the collected drying parameter values ​​reach the target values ​​in the drying strategy corresponding to the current drying stage, then proceed to the next drying stage and control the next drying stage until the entire drying process is completed.

[0078] If the collected drying parameter values ​​do not reach the target values ​​in the drying strategy corresponding to the current drying stage, then the first and second throttle valves will continue to be adjusted according to the drying strategy corresponding to the current drying stage.

[0079] If the collected drying parameter values ​​reach the target values ​​in the drying strategy corresponding to the current drying stage, then proceed to the next drying stage and control the next drying stage until the entire drying process is completed.

[0080] In the initial stage of drying, precise control of the moisture content of the garments is necessary to maximize the handling of moisture load. Therefore, the target values ​​in the drying strategy for the initial stage of drying include the target humidity value.

[0081] In the later stages of drying, precise temperature control of the garments is necessary to achieve optimal energy efficiency. Therefore, the target values ​​in the drying strategy for the later stages of drying include target temperature values.

[0082] By combining different target values ​​set in the early and late stages of drying, determining whether the collected drying parameter values ​​have reached the target values ​​in the drying strategy corresponding to the current drying stage includes the following steps:

[0083] When the current drying stage of the drying process is the early drying stage, the humidity value of the clothes is collected;

[0084] Determine whether the collected humidity value of the clothes has reached the target humidity value in the drying strategy corresponding to the early stage of drying;

[0085] Otherwise, increase the opening degree of the first throttle valve to increase the refrigerant flow into the first evaporator to speed up the drying of clothes and reduce the humidity of clothes. At the same time, control the second throttle valve to be fully open and switch to the current drying stage of the drying process when it is the early drying stage to collect the humidity value of clothes.

[0086] Then it enters the later stage of drying, and the control of the later stage of drying is carried out;

[0087] When the current drying stage of the drying process is the later stage of drying, the temperature value of the clothes is collected;

[0088] Determine whether the collected clothing temperature value has reached the target temperature value in the corresponding drying strategy in the later stage of drying;

[0089] Otherwise, the first throttle valve is fully opened, the opening degree of the second throttle valve is increased, the refrigerant flow into the second evaporator is increased, the condenser area is increased, and the outlet air temperature is increased;

[0090] If yes, proceed to the next step.

[0091] To control the humidity of clothes after drying, the target values ​​in the drying strategy for the later stages of drying also include target humidity values. Therefore, determining whether the collected drying parameter values ​​have reached the target values ​​in the drying strategy for the later stages of drying includes the following steps:

[0092] When the current drying stage of the drying process is the later stage of drying, the humidity value of the clothes is collected;

[0093] Determine whether the collected humidity value of the clothes has reached the target humidity value in the corresponding drying strategy in the later stage of drying;

[0094] Otherwise, the temperature value of the clothes is collected, and it is determined whether the collected temperature value of the clothes has reached the target temperature value in the drying strategy corresponding to the later stage of drying; otherwise, the first throttle valve is fully opened, the opening degree of the second throttle valve is increased, the refrigerant flow into the second evaporator is increased, the condenser area is increased, the outlet air temperature is increased, and the process jumps to the later stage of drying when the current drying stage is the later stage of drying, and the humidity value of the clothes is collected; if yes, the first throttle valve is kept fully open, the current opening degree of the second throttle valve is maintained or reduced, the outlet air temperature is maintained, and the process jumps to the later stage of drying when the current drying stage is the later stage of drying, and the humidity value of the clothes is collected.

[0095] If yes, proceed to the next step.

[0096] Example 4

[0097] An electronic device 200, such as Figure 4 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 two-stage dehumidification system of a heat pump dryer. For a detailed description of the method, please refer to the corresponding description in the above method embodiments, which will not be repeated here.

[0098] Example 5

[0099] A computer-readable storage medium, such as Figure 5 As shown, it stores program instructions, which, when executed, implement a control method for a two-stage dehumidification system of a heat pump dryer. For a detailed description of the method, please refer to the corresponding description in the above method embodiments; it will not be repeated here.

[0100] Example 6

[0101] A computer program product includes a computer program / instructions that, when executed by a processor, implement a control method for a two-stage dehumidification system in a heat pump dryer. A detailed description of the method can be found in the corresponding descriptions in the above-described method embodiments, and will not be repeated here.

[0102] 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.

[0103] 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.

[0104] 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 two-stage dehumidification system in a heat pump dryer, characterized in that, Includes the following steps: Determine the current drying stage of the drying process; Obtain the drying strategy corresponding to the current drying stage; The opening degree of the first and second throttle valves is controlled by the obtained drying strategy; If the collected drying parameter values ​​reach the target values ​​in the drying strategy corresponding to the current drying stage, then proceed to the next drying stage and control the next drying stage until the entire drying process is completed. Determining the current drying stage of the drying process includes the following steps: Obtain the collected humidity values ​​of the clothing and / or the running time of the drying process; Determine whether the collected clothing humidity value and / or the drying process running time have reached the preset value for the later stage of drying; Otherwise, the current drying stage of the drying process is determined to be the early drying stage; If so, the current drying stage of the drying process is determined to be the later stage of drying; The drying strategy corresponding to the early stage of drying is to control the first throttle valve to throttle and control the second throttle valve to be fully open; The drying strategy corresponding to the later stage of drying is to control the first throttle valve to be fully open and control the second throttle valve to throttle.

2. The control method for a two-stage dehumidification system of a heat pump dryer according to claim 1, characterized in that, The process of controlling the opening degree of the first and second throttle valves using the obtained drying strategy includes the following steps: When the current drying stage of the drying process is the early drying stage, the first throttle valve is controlled to throttle, and the second throttle valve is controlled to be fully open. When the current drying stage of the drying process is the later stage of drying, the first throttle valve is fully opened and the second throttle valve is throttled.

3. The control method for a two-stage dehumidification system of a heat pump dryer according to claim 1, characterized in that: The target values ​​in the drying strategy corresponding to the pre-drying stage include target humidity values; The target values ​​in the drying strategy corresponding to the later stage of drying include the target temperature value.

4. The control method for a two-stage dehumidification system of a heat pump dryer according to claim 3, characterized in that, If the collected drying parameter values ​​reach the target values ​​in the drying strategy corresponding to the current drying stage, then proceed to the next drying stage and control the next drying stage until the entire drying process is completed. This includes the following steps: When the current drying stage of the drying process is the early drying stage, the humidity value of the clothes is collected; Determine whether the collected humidity value of the clothes has reached the target humidity value in the drying strategy corresponding to the early stage of drying; Otherwise, increase the opening degree of the first throttle valve, control the second throttle valve to be fully open, and jump to the point where the current drying stage of the drying process is the early drying stage, and collect the humidity value of the clothes; Then it enters the later stage of drying, and the control of the later stage of drying is carried out; When the current drying stage of the drying process is the later stage of drying, the temperature value of the clothes is collected; Determine whether the collected clothing temperature value has reached the target temperature value in the corresponding drying strategy in the later stage of drying; Otherwise, control the first throttle valve to be fully open, increase the opening degree of the second throttle valve, and jump to the point where the current drying stage of the drying process is the later stage of drying, and collect the temperature value of the clothes; If yes, proceed to the next step.

5. The control method for a two-stage dehumidification system of a heat pump dryer according to claim 3, characterized in that: The target values ​​in the drying strategy corresponding to the later stage of drying also include target humidity values; If the collected drying parameter values ​​reach the target values ​​in the drying strategy corresponding to the current drying stage, then proceed to the next drying stage and control the next drying stage until the entire drying process is completed. This process also includes the following steps: When the current drying stage of the drying process is the later stage of drying, the humidity value of the clothes is collected; Determine whether the collected humidity value of the clothes has reached the target humidity value in the corresponding drying strategy in the later stage of drying; Otherwise, the temperature value of the clothes is collected, and it is determined whether the collected temperature value of the clothes reaches the target temperature value in the drying strategy corresponding to the later stage of drying; otherwise, the first throttle valve is fully opened, the opening degree of the second throttle valve is increased, and the process jumps to the point where the current drying stage of the drying process is the later stage of drying, and the humidity value of the clothes is collected; if yes, the first throttle valve is kept fully open, the current opening degree of the second throttle valve is kept or decreased, and the process jumps to the point where the current drying stage of the drying process is the later stage of drying, and the humidity value of the clothes is collected. If yes, proceed to the next step.

6. 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 5.

7. A two-stage dehumidification system for a heat pump clothes dryer, characterized in that, include: The system comprises a compressor, a condenser, a first throttling valve, a first evaporator, a second throttling valve, a second evaporator, and a controller. The discharge pipe of the compressor is connected to the inlet of the condenser. The outlet of the condenser is connected to the inlet of the first evaporator via the first throttling valve. The outlet of the first evaporator is connected to the inlet of the second evaporator via the second throttling valve. The outlet of the second evaporator is connected to the suction pipe of the compressor. The controller is used to execute a control method for a two-stage dehumidification system of a heat pump dryer as described in any one of claims 1 to 5.

8. A heat pump clothes dryer, characterized in that: It includes a dryer body and a two-stage dehumidification system for a heat pump dryer as described in claim 7, which is disposed within the dryer body.

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