Clothes dryer heat pump system and clothes dryer

Abstract

The application relates to the technical field of clothes dryers, and provides a clothes dryer heat pump system and a clothes dryer. The clothes dryer heat pump system comprises a compressor, a condenser, a phase-change cold accumulator and an evaporator which are sequentially arranged. The first branch and the second branch are connected in parallel at the outlet of the condenser (the first branch and the second branch are connected with the phase-change cold accumulator and the evaporator respectively), and a switching device is arranged, so that flexible control of the operation mode is realized. In the initial temperature rising stage, the system controls the switching device to turn on the first branch and turn off the second branch. The refrigerant flows through the phase-change cold accumulator, the heat exchanger in the box absorbs the heat of the refrigerant (evaporates and absorbs heat), and the cold energy is stored in the phase-change material. Since the evaporator does not work at this time, the system will not output cold air to the drum, so that the sensible heat loss caused by air cooling is avoided. This strategy directly improves the temperature rising rate in the initial stage, thereby shortens the overall drying time, and realizes energy saving and consumption reduction.

Description

Technical Field

[0001] This application belongs to the field of dryer technology, and particularly relates to a dryer heat pump system and a dryer. Background Technology

[0002] In related technologies, heat pump dryers are household cleaning appliances that use hot air circulation to instantly evaporate and dry the moisture in clothes. Inside the outer casing of a heat pump dryer is a drum, and between the drum and the casing are components such as a compressor, evaporator, condenser, throttling device, and fan. When the dryer is working, the condenser heats the air, which is then sent into the drum by the fan. The hot air carries away the moisture from the clothes inside the drum, which is then cooled by the evaporator to form condensate. Through multiple cycles, the clothes inside the drum are finally dried.

[0003] However, in the initial heating stage of the aforementioned heat pump dryers, the humid air inevitably cools down as it passes through the evaporator, resulting in sensible heat loss. This leads to a slow heating rate in the initial heating stage, a long overall drying time, and high energy consumption. Utility Model Content

[0004] This application provides a dryer heat pump system and a dryer to solve the problems of slow initial heating speed and high energy consumption in existing dryers during the drying process.

[0005] In a first aspect, embodiments of this application provide a dryer heat pump system, including a compressor, a condenser, a phase change cold storage device and an evaporator arranged in sequence. The outlet of the condenser is provided with a first branch and a second branch connected in parallel. The phase change cold storage device is located in the first branch and the evaporator is located in the second branch.

[0006] The dryer heat pump system also includes a switching device, which is used to control the connection or disconnection of the first branch and the second branch.

[0007] In some embodiments of this application, the switching device includes:

[0008] The first shut-off valve is installed in the first branch and located at the front end of the phase change cold storage device;

[0009] The second shut-off valve is installed in the second branch and located at the front end of the evaporator.

[0010] In some embodiments of this application, the dryer heat pump system is further provided with a third branch, which connects the outlet of the phase change cold storage and the inlet of the evaporator, and the third branch is provided with a third shut-off valve.

[0011] In some embodiments of this application, a first connection point is provided on the first branch, the first connection point is located at the outlet of the phase change accumulator, and the first connection point is used to connect to the third branch; a fourth shut-off valve is provided at the rear end of the first connection point.

[0012] In some embodiments of this application, the dryer heat pump system further includes a first electronic expansion valve, which is connected to the outlet of the condenser and located at the front end of the first branch and the second branch.

[0013] In some embodiments of this application, the dryer heat pump system further includes:

[0014] The second electronic expansion valve is located in the first branch;

[0015] The third electronic expansion valve is located in the second branch;

[0016] The fourth branch connects the condenser and the phase change cold storage, and the fourth branch is equipped with a fifth shut-off valve.

[0017] In some embodiments of this application, the dryer heat pump system includes:

[0018] Low-temperature circulation system;

[0019] High-temperature circulating system;

[0020] A cascade heat exchanger connects the low-temperature stage circulation system and the high-temperature stage circulation system for heat exchange.

[0021] The phase change cold storage device and the evaporator are located in the low-temperature stage circulation system, and the condenser is located in the high-temperature stage circulation system.

[0022] In some embodiments of this application, the compressor includes:

[0023] A primary compressor is installed in the cryogenic stage circulation system;

[0024] A secondary compressor is installed in the high-temperature stage circulation system.

[0025] In some embodiments of this application, the cascade heat exchanger includes a plate heat exchanger, a shell-and-tube heat exchanger, or a shell-and-tube heat exchanger.

[0026] Secondly, this application also provides a clothes dryer, which includes the clothes dryer heat pump system as described in the above embodiments.

[0027] The dryer heat pump system provided in this application includes a compressor, a condenser, a phase change cold storage unit, and an evaporator arranged in sequence. The condenser outlet has a first branch and a second branch connected in parallel. The phase change cold storage unit is located on the first branch, and the evaporator is located on the second branch. The dryer heat pump system also includes a switching device for controlling the connection or disconnection of the first and second branches. By setting the first and second branches (connected to the phase change cold storage unit and the evaporator respectively) in parallel at the condenser outlet and equipping them with a switching device, flexible control of the operating mode is achieved. In the initial heating stage, the system controls the switching device to connect the first branch and disconnect the second branch. The refrigerant flows through the phase change cold storage unit, and the heat exchanger inside the unit absorbs the heat from the refrigerant (through evaporation heat absorption), storing the cold energy in the phase change material. Since the evaporator is not working at this time, the system does not output cold air to the drum, avoiding sensible heat loss caused by air cooling. This strategy directly improves the heating rate in the initial stage, thereby shortening the overall drying time and achieving energy saving and consumption reduction.

[0028] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0031] Figure 1 Schematic diagram of the structure of the dryer heat pump system provided in the embodiments of this application Figure 1 .

[0032] Figure 2 Schematic diagram of the structure of the dryer heat pump system provided in the embodiments of this application Figure 2 .

[0033] Figure 3 Schematic diagram of the structure of the dryer heat pump system provided in the embodiments of this application Figure 3 .

[0034] Figure 4 Schematic diagram of the structure of the dryer heat pump system provided in the embodiments of this application Figure 4 .

[0035] Figure label:

[0036] A. Low-temperature circulation system; B. High-temperature circulation system;

[0037] 10. First branch road; 11. First connecting point; 20. Second branch road; 30. Third branch road; 40. Fourth branch road;

[0038] 100. Compressor; 110. Single-stage compressor; 120. Two-stage compressor;

[0039] 200. Condenser;

[0040] 300. Phase change cold storage device;

[0041] 400. Evaporator;

[0042] 500. Switching device; 510. First shut-off valve; 520. Second shut-off valve; 530. Third shut-off valve; 540. Fourth shut-off valve; 550. Fifth shut-off valve;

[0043] 610. First electronic expansion valve; 620. Second electronic expansion valve; 630. Third electronic expansion valve;

[0044] 700. Cascade heat exchanger. Detailed Implementation

[0045] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but should not be used to limit the scope of this application.

[0046] In the description of the embodiments of this application, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0048] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0050] With increasing demands for energy conservation and environmental protection, heat pump dryers are gradually replacing traditional electric heating dryers due to their high coefficient of performance (COP) and low-temperature drying characteristics. However, traditional heat pump systems require a long preheating time during startup, resulting in slow system temperature rise and long overall drying time, impacting user experience. Furthermore, due to the lag in refrigerant circulation, especially in low-temperature environments, the system takes even longer to reach steady-state operating temperature. Therefore, it is necessary to improve the initial temperature rise rate of the heat pump system, shorten the drying cycle, and enhance the user experience.

[0051] This application provides a heat pump system and dryer for a clothes dryer, to solve the problems of slow initial temperature rise and high energy consumption in existing clothes dryers. The following will be described in conjunction with the accompanying drawings. Figure 1-4 Please provide an explanation.

[0052] The dryer heat pump system provided in this application embodiment is referenced. Figure 1As shown, the system includes a compressor 100, a condenser 200, a phase change cold storage 300, and an evaporator 400 arranged in sequence. The outlet of the condenser 200 is provided with a first branch 10 and a second branch 20 connected in parallel. The phase change cold storage 300 is located on the first branch 10, and the evaporator 400 is located on the second branch 20. The dryer heat pump system also includes a switching device 500, which is used to control the connection or disconnection of the first branch 10 and the second branch 20.

[0053] In this embodiment, the compressor 100 is responsible for compressing the low-temperature, low-pressure refrigerant gas into a high-temperature, high-pressure gas, providing power for the entire heat pump cycle. The condenser 200 is responsible for cooling the high-temperature, high-pressure refrigerant gas, causing it to release heat and condense into a liquid. This heat is mainly used to heat the air inside the dryer drum. The condenser 200 outlet has a first branch 10 and a second branch 20 connected in parallel, which are respectively connected to the phase change cold storage 300 and the evaporator 400.

[0054] The phase change refrigerant 300 is filled with phase change material, which can absorb and store a large amount of heat. In a specific mode, it acts as a temporary evaporator 400, absorbing heat from the refrigerant to store cooling capacity. In normal operation, the evaporator 400 is responsible for absorbing heat from the humid air returning from the drum, thereby reducing the air temperature and removing moisture.

[0055] During the initial heating phase, the first branch 10 is activated via the switching device 500, allowing the phase change refrigerant 300 to absorb heat from the refrigerant and achieve rapid cold storage. Simultaneously, the evaporator 400 remains inactive, preventing sensible heat loss when humid air passes through it. This design significantly improves the initial heating rate and shortens the preheating time. Due to the rapid initial heating, the system operates less at low temperatures, thereby reducing energy consumption.

[0056] The presence of the switching device 500 allows the system to flexibly switch operating modes according to actual needs. It can utilize the phase change accumulator 300 when rapid heating is required, or switch back to the conventional path during normal drying, achieving an optimal operating strategy. Furthermore, the phase change accumulator 300, acting as a thermal buffer, can balance temperature fluctuations within the system to a certain extent, enhancing the operational stability of the dryer's heat pump system.

[0057] In one alternative implementation, refer to Figure 2 As shown, the switching device 500 includes a first shut-off valve 510 and a second shut-off valve 520. The first shut-off valve 510 is disposed in the first branch 10 and located at the front end of the phase change cold storage 300; the second shut-off valve 520 is disposed in the second branch 20 and located at the front end of the evaporator 400.

[0058] In this embodiment, the first shut-off valve 510 is installed on the first branch 10 at the outlet of the condenser 200, specifically at the front end of the phase change accumulator 300 (i.e., the position before the refrigerant flows into the phase change accumulator 300), and is used to control whether the refrigerant can flow into the phase change accumulator 300. When the first shut-off valve 510 is open, the refrigerant can flow into the phase change accumulator 300; when it is closed, it blocks the flow.

[0059] The second shut-off valve 520 is installed on the second branch 20 at the outlet of the condenser 200, specifically at the front end of the evaporator 400 (i.e., before the refrigerant flows into the evaporator 400), and is used to control whether the refrigerant can flow into the evaporator 400. When the second shut-off valve 520 is open, the refrigerant can flow into the evaporator 400; when it is closed, it blocks this flow. Compared with complex electric switching valves or four-way valves, the shut-off valve has a simple structure and lower cost.

[0060] In one alternative implementation, refer to Figure 2 As shown, the dryer heat pump system is also provided with a third branch 30, which connects the outlet of the phase change cold storage 300 and the inlet of the evaporator 400, and the third branch 30 is provided with a third shut-off valve 530.

[0061] For example, in the later stage of drying and cooling, in order to accelerate the release of water vapor in the drum outlet air, the first branch 10 and the second branch 20 can be disconnected and the third branch 30 can be turned on, that is, the refrigerant flows through the condenser 200, the phase change accumulator 300 and the evaporator 400 in sequence and then returns to the compressor 100.

[0062] Since the phase change refrigerant 300 has already stored a certain amount of cold energy during the initial heating stage, when the relatively high-temperature refrigerant flows through the phase change refrigerant 300, it will cause the phase change material to undergo a phase change, thereby absorbing heat and releasing the stored cold energy. This further reduces the temperature of the refrigerant after it flows through the phase change refrigerant 300. The low-temperature refrigerant then enters the evaporator 400. Because the temperature of the refrigerant entering the evaporator 400 is even lower, the surface temperature of the evaporator 400 also decreases. When hot and humid air flows through the evaporator 400, the lower evaporator 400 temperature can more effectively condense the water vapor in the air into liquid water, thereby significantly improving the dehumidification efficiency. Releasing the energy stored in the cold storage stage in the later drying stage allows for fuller utilization of the function of the phase change refrigerant 300, improving the energy utilization efficiency of the entire system.

[0063] In one alternative implementation, refer to Figure 2 As shown, a first connection point 11 is provided on the first branch 10. The first connection point 11 is located at the outlet of the phase change accumulator 300 and is used to connect to the third branch 30. A fourth shut-off valve 540 is provided at the rear end of the first connection point 11.

[0064] by Figure 2 Taking the dryer heat pump system shown as an example, in this embodiment, the dryer heat pump system has the following three operating stages:

[0065] (1) Cold storage stage: Evaporator 400 pipe section is closed, phase change cold storage 300 pipe section is open (i.e., the second stop valve 520 and the third stop valve 530 are closed, and the first stop valve 510 and the fourth stop valve 540 are open). The cold energy is stored in the phase change cold storage 300. The system does not cool the air outlet of the drum. In the initial heating stage of the dryer heat pump system, the evaporation temperature is low. The heat exchanger in the cold storage box acts as the evaporator 400 to store the cold energy, which can improve the overall heating speed.

[0066] (2) Normal cooling stage: Evaporator 400 pipe section is open, phase change cold storage 300 pipe section is closed (i.e., the first stop valve 510, the third stop valve 530 and the fourth stop valve 540 are closed, and the second stop valve 520 is open). The system is used as a normal heat pump system to cool the drum outlet air. It is suitable for the stage where the drum inlet air temperature reaches the stable inlet air temperature of the non-cold storage system.

[0067] (3) Cooling Release Stage: Both the evaporator 400 and the phase change regenerator 300 are open (second shut-off valve 520 and fourth shut-off valve 540 are closed, first shut-off valve 510 and third shut-off valve 530 are open). The phase change regenerator 300 releases cooling capacity to lower the temperature of the evaporator 400, which in turn condenses the water vapor in the drum outlet air. This stage is suitable for use in the later stages of drying in a clothes dryer, where the cooling capacity of the regenerator is released, increasing the system's cooling capacity and accelerating the condensation of water vapor in the drum outlet air.

[0068] In this embodiment, the heat pump system of the dryer transfers and stores the cold energy in the evaporator 400 during the initial stage of drying, effectively accelerating the initial heating speed of the heat pump system; during the later stage of drying, the cold energy is released to lower the evaporation temperature, which can increase the cooling capacity and accelerate the drying speed of the later load, thus shortening the overall drying time of the heat pump dryer and improving the user experience.

[0069] In one alternative implementation, refer to Figure 2 As shown, the dryer heat pump system also includes a first electronic expansion valve 610, which is connected to the outlet of the condenser 200 and located at the front end of the first branch 10 and the second branch 20.

[0070] The electronic expansion valve can adjust its opening very precisely and continuously, thereby accurately controlling the refrigerant flow from the condenser 200 to the downstream (phase change accumulator 300 or evaporator 400).

[0071] In one alternative implementation, refer to Figure 3 As shown, the dryer heat pump system includes a second electronic expansion valve 620, a third electronic expansion valve 630, and a fourth branch 40. The second electronic expansion valve 620 is located in the first branch 10; the third electronic expansion valve 630 is located in the second branch 20; the fourth branch 40 connects the condenser 200 and the phase change cold storage 300, and the fourth branch 40 is equipped with a fifth shut-off valve 550.

[0072] by Figure 3 Taking the dryer heat pump system shown as an example, in this embodiment, the dryer heat pump system has the following three operating stages:

[0073] (1) Cold storage stage: Evaporator 400 pipe section is closed, phase change cold storage 300 pipe section is open (i.e., the second stop valve 520, the third stop valve 530 and the fifth stop valve 550 are closed, and the first stop valve 510 and the fourth stop valve 540 are open). The cold energy is stored in the phase change cold storage 300. The system does not cool the air outlet of the drum. In the initial heating stage of the dryer heat pump system, the evaporation temperature is low. The heat exchanger in the cold storage box acts as the evaporator 400 to store the cold energy, which can improve the system heating speed.

[0074] (2) Normal refrigeration stage: Evaporator 400 pipe section is open, phase change cold storage 300 pipe section is closed (i.e., the first stop valve 510, the third stop valve 530, the fourth stop valve 540 and the fifth stop valve 550 are closed, and the second stop valve 520 is open). The system is used as a normal heat pump system to cool the drum outlet air. It is suitable for the stage where the drum inlet air temperature reaches the stable inlet air temperature of the non-cold storage system.

[0075] (3) Cooling Release Stage: Both the evaporator 400 and the phase change refrigerant 300 are in operation (first shut-off valve 510, second shut-off valve 520, and fourth shut-off valve 540 are closed; fifth shut-off valve 550 and third shut-off valve 530 are open). The refrigerant line from the condenser 200 outlet flows through the phase change refrigerant 300 and then through the third electronic expansion valve 630. The phase change refrigerant 300 releases cooling capacity to lower the temperature of the refrigerant at the condenser 200 outlet, increasing the system subcooling and effectively improving the heat exchange effect of the evaporator 400. The evaporator 400 is responsible for condensing the water vapor in the drum air outlet. This is suitable for use in the later stages of drying in a clothes dryer, releasing the cooling capacity in the storage tank to increase the system's cooling capacity and accelerate the precipitation of water vapor in the drum air outlet.

[0076] In this embodiment, the heat pump system of the dryer transfers and stores the cold energy in the evaporator 400 during the initial stage of drying, effectively accelerating the initial heating speed of the heat pump system. During the later stage of drying, the cold energy is released to reduce the refrigerant temperature at the outlet of the condenser 200 and before entering the throttling element (electronic expansion valve), thereby increasing the system subcooling and reducing the amount of refrigerant flash evaporation after throttling. This effectively increases the system's cooling capacity, shortens the overall drying time of the heat pump dryer, and improves the user experience.

[0077] In one alternative implementation, refer to Figure 4 As shown, the dryer heat pump system includes a low-temperature stage circulation system A, a high-temperature stage circulation system B, and a cascade heat exchanger 700. The cascade heat exchanger 700 connects the low-temperature stage circulation system A and the high-temperature stage circulation system B for heat exchange. The phase change cold storage 300 and the evaporator 400 are located in the low-temperature stage circulation system A, and the condenser 200 is located in the high-temperature stage circulation system B.

[0078] In this embodiment, the temperature of the high-temperature stage circulation system B is higher than the temperature of the low-temperature stage circulation system A, and the specific temperature adjustment range is not specifically limited in this embodiment. The original condenser 200 in the low-temperature stage circulation system A is replaced by a cascade heat exchanger 700, which exchanges heat with the high-temperature stage circulation system B, serving as the heat source for the high-temperature stage circulation system B. Through the reciprocating cycle of the two-stage heat pump system, the high-temperature stage circulation system B absorbs heat from the low-temperature stage circulation system A, enabling the entire unit to obtain more heat more quickly, thus achieving rapid heating of the entire heat pump system.

[0079] In one alternative implementation, refer to Figure 3 and Figure 4 As shown, compressor 100 includes a primary compressor 110 and a secondary compressor 120. The primary compressor 110 is located in the low-temperature stage circulation system A; the secondary compressor 120 is located in the high-temperature stage circulation system B. This ensures that the cascade heat pump system can compress the refrigerant and exchange heat in two independent temperature ranges as designed, thereby achieving rapid and efficient heat transfer and clothing drying.

[0080] In one optional implementation, the cascade heat exchanger 700 includes a plate heat exchanger, a shell-and-tube heat exchanger, or a shell-and-tube heat exchanger, which can be selected and designed according to specific needs. This embodiment does not impose any specific limitations on this.

[0081] Secondly, embodiments of this application also provide a clothes dryer, which includes the clothes dryer heat pump system as described in the above embodiments.

[0082] It is understood that the dryer in this embodiment can be a dryer with only drying function, or it can be a washer-dryer combo.

[0083] It is understood that since the heat pump system of the dryer has the beneficial effects of the above embodiments, the dryer will have the beneficial effects of the above embodiments accordingly. The specific implementation method can be referred to the above embodiments, and this embodiment will not repeat it.

[0084] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate this application and are not intended to limit this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of this application do not depart from the spirit and scope of the technical solutions of this application and should all be covered within the protection scope of this application.

Claims

1. A heat pump system for a clothes dryer, characterized in that, It includes a compressor, a condenser, a phase change cold storage device and an evaporator arranged in sequence. The outlet of the condenser is provided with a first branch and a second branch connected in parallel. The phase change cold storage device is located in the first branch and the evaporator is located in the second branch. The dryer heat pump system also includes a switching device, which is used to control the connection or disconnection of the first branch and the second branch.

2. The dryer heat pump system according to claim 1, characterized in that, The switching device includes: The first shut-off valve is installed in the first branch and located at the front end of the phase change cold storage device; The second shut-off valve is installed in the second branch and located at the front end of the evaporator.

3. The dryer heat pump system according to claim 1, characterized in that, The dryer heat pump system is also provided with a third branch, which connects the outlet of the phase change cold storage unit and the inlet of the evaporator, and the third branch is provided with a third shut-off valve.

4. The dryer heat pump system according to claim 3, characterized in that, A first connection point is provided on the first branch, the first connection point is located at the outlet of the phase change accumulator, and the first connection point is used to connect to the third branch; a fourth shut-off valve is provided at the rear end of the first connection point.

5. The dryer heat pump system according to claim 1, characterized in that, The dryer heat pump system also includes a first electronic expansion valve, which is connected to the outlet of the condenser and located at the front end of the first branch and the second branch.

6. The dryer heat pump system according to claim 1, characterized in that, The dryer heat pump system also includes: The second electronic expansion valve is located in the first branch; The third electronic expansion valve is located in the second branch; The fourth branch connects the condenser and the phase change cold storage, and the fourth branch is equipped with a fifth shut-off valve.

7. The dryer heat pump system according to any one of claims 1-6, characterized in that, The dryer heat pump system includes: Low-temperature circulation system; High-temperature circulating system; A cascade heat exchanger connects the low-temperature stage circulation system and the high-temperature stage circulation system for heat exchange. The phase change cold storage device and the evaporator are located in the low-temperature stage circulation system, and the condenser is located in the high-temperature stage circulation system.

8. The dryer heat pump system according to claim 7, characterized in that, The compressor includes: A primary compressor is installed in the cryogenic stage circulation system; A secondary compressor is installed in the high-temperature stage circulation system.

9. The dryer heat pump system according to claim 7, characterized in that, The cascade heat exchanger includes a plate heat exchanger, a shell-and-tube heat exchanger, or a shell-and-tube heat exchanger.

10. A clothes dryer, characterized in that, The dryer includes a dryer heat pump system as described in any one of claims 1-9.

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