Heat pump type clothes dryer

Abstract

The heat pump type clothes dryer comprises a roller, a compressor, a four-way valve, an evaporator and a condenser, the roller is rotationally installed in a machine body, an air supply channel is formed in the machine body, the output end of the air supply channel communicates with the interior of the roller, the compressor is installed in the machine body, and the compressor is connected with the evaporator and the condenser through the four-way valve; the condenser is arranged in the air supply channel and is connected with the evaporator through a pipeline; the evaporator comprises a main body part, a refrigerant inlet, a refrigerant outlet and a liquid supplementing opening, the refrigerant inlet and the refrigerant outlet are arranged at intervals in the heat exchange direction of the main body part, the refrigerant outlet is connected with the four-way valve, the refrigerant inlet is connected with the condenser through a pipeline, and the liquid supplementing opening is connected with the condenser through a branch pipeline. According to the clothes dryer, a proper amount of liquid refrigerant or gas-liquid two-phase mixed refrigerant is supplemented in the area, close to the refrigerant outlet, of the evaporator, so that the proportion of overheated refrigerant gas in the evaporator is reduced, and the heat exchange performance of the clothes dryer is optimized by precisely regulating and controlling the refrigerant state.

Description

Technical Field

[0001] This application relates to the technical field of clothes dryers, and more particularly to a heat pump clothes dryer. Background Technology

[0002] Clothes dryers, as household appliances that accelerate the evaporation of moisture from clothes by heating the air, are particularly important in humid environments such as northern winters and the "return of spring" weather in the south, where natural drying of clothes is difficult. Their working principle mainly relies on a highly efficient heat exchange system to heat the air and rapidly evaporate the moisture from the clothes.

[0003] In the heat exchange system of a clothes dryer, the refrigerant plays a crucial role. The heat exchange process of the refrigerant within the evaporator is a key step in achieving heat transfer and heating the air. However, the heat transfer coefficient of the refrigerant is not constant but changes significantly during its evaporation process. Specifically, when the two-phase refrigerant, a mixture of gas and liquid, flows upward from the bottom of the evaporator, the lower region has a high heat transfer coefficient due to the continuous evaporation and boiling of the gas and liquid phases. But as the refrigerant gradually flows upward and transforms into a superheated refrigerant gas, its heat transfer coefficient gradually decreases. During this phase transition, the refrigerant gradually transitions from a gas-liquid mixed two-phase state at the evaporator inlet to a saturated state, and finally to a superheated state. It is worth noting that the heat transfer coefficient of the refrigerant is much higher in the gas-liquid coexisting state than in the gaseous state. Therefore, inside the evaporator, its heat transfer coefficient shows a gradual decreasing trend as the refrigerant's state changes. This change in the heat transfer coefficient directly affects the heat exchange efficiency of the clothes dryer. With continuous use, the heat exchange coefficient gradually decreases, making it difficult for the dryer's heat exchange efficiency to meet the actual needs of the system, leading to problems such as increased energy consumption and prolonged drying time. Utility Model Content

[0004] The purpose of this application embodiment is to provide a heat pump dryer that supplements an appropriate amount of liquid refrigerant or gas-liquid two-phase mixed refrigerant in the area near the refrigerant outlet of the evaporator to reduce the proportion of superheated refrigerant gas inside the evaporator. By precisely controlling the refrigerant state, the heat exchange performance of the dryer is optimized.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] On one hand, a heat pump dryer is provided, comprising: a drum, a compressor, a four-way valve, an evaporator, and a condenser. The drum is rotatably mounted in the machine body, and the machine body is provided with an air supply channel. The output end of the air supply channel is connected to the interior of the drum. The compressor is mounted in the machine body and is connected to the evaporator and the condenser respectively through the four-way valve. The condenser is disposed in the air supply channel and is connected to the evaporator through a pipe.

[0007] The evaporator includes a main body, a refrigerant inlet, a refrigerant outlet, and a liquid replenishment port. The refrigerant inlet and the refrigerant outlet are spaced apart along the heat exchange direction of the main body. The refrigerant outlet is connected to the four-way valve. The refrigerant inlet is connected to the condenser through a pipe. The liquid replenishment port is located on the main body near the refrigerant outlet and is connected to the condenser through a branch pipe.

[0008] Furthermore, the evaporator is a shell-and-tube heat exchanger, and the condenser is a finned heat exchanger.

[0009] Furthermore, it also includes a gas-liquid separator. The compressor has a first port and a second port. The four-way valve includes a main valve port and three branch valve ports that are respectively connected to the main valve port. The main valve port is connected to the first port. The three branch valve ports are respectively connected to the evaporator, the condenser and the gas-liquid separator. The gas-liquid separator is connected to the second port.

[0010] Furthermore, a replenishing valve is installed on the branch pipeline.

[0011] Furthermore, the replenishing valve is a one-way valve, a solenoid valve, or an electronic expansion valve.

[0012] Furthermore, it also includes a filter assembly, which is detachably installed within the air supply duct.

[0013] Furthermore, the filtering component is a filter screen.

[0014] Furthermore, the filter screen is disposed between the input end of the air supply channel and the condenser; or the filter screen is disposed between the condenser and the output end of the air supply channel.

[0015] Furthermore, a maintenance door is movably connected to one side of the machine body.

[0016] Furthermore, an aromatherapy plate is provided at the output end of the air supply channel.

[0017] The beneficial effects of this application are as follows: The dryer includes components such as a drum, compressor, four-way valve, evaporator, and condenser. The drum is rotated and installed inside the machine body, and its interior is connected to the output end of the air supply channel. The compressor is responsible for compressing the refrigerant gas into a high-temperature and high-pressure state, which is then guided to the condenser through the four-way valve. In the condenser, the high-temperature and high-pressure refrigerant gas exchanges heat with the air in the air supply channel, condensing into high-pressure liquid refrigerant, while simultaneously heating the air to make it hot air, which is then sent into the drum to dry the clothes.

[0018] The evaporator, a key component of the heat exchange system, comprises a main body, a refrigerant inlet, a refrigerant outlet, and a replenishment port. The refrigerant inlet and outlet are spaced apart along the heat exchange direction of the main body to ensure orderly refrigerant flow within the evaporator. The replenishment port is cleverly positioned near the refrigerant outlet and connected to the condenser via a branch pipe. It is used to replenish the evaporator with an appropriate amount of liquid refrigerant or a gas-liquid two-phase mixture. As the refrigerant gradually evaporates from a liquid to a gaseous state within the evaporator, its heat transfer coefficient decreases significantly, affecting the dryer's heat exchange efficiency. By replenishing the evaporator with fresh liquid refrigerant or a gas-liquid two-phase mixture near the refrigerant outlet, the proportion of superheated refrigerant gas can be effectively reduced, increasing the overall heat transfer coefficient of the evaporator. This not only enhances heat exchange efficiency but also significantly reduces the energy consumption required to achieve the same drying effect, while also significantly shortening the drying time for clothes. Attached Figure Description

[0019] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a perspective view of the heat pump dryer described in the embodiments of this application;

[0021] Figure 2 This is a cross-sectional view of the heat pump dryer described in the embodiments of this application;

[0022] Figure 3 This is a schematic diagram of the refrigerant flow system in an embodiment of this application.

[0023] In the diagram: 1. Body; 101. Air supply duct; 2. Drum; 3. Compressor; 301. First port; 302. Second port; 4. Four-way valve; 5. Evaporator; 501. Main body; 502. Refrigerant inlet; 503. Refrigerant outlet; 504. Liquid replenishment port; 6. Condenser; 7. Liquid replenishment valve; 8. Gas-liquid separator; 9. Branch piping; 10. Maintenance door. Detailed Implementation

[0024] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] like Figures 1-3 As shown, this embodiment provides a heat pump dryer, including: a drum 2, a compressor 3, a four-way valve 4, an evaporator 5, and a condenser 6. The drum 2 is rotatably installed inside the body 1. The body 1 is provided with an air supply channel 101, the output end of which communicates with the interior of the drum 2. The compressor 3 is installed inside the body 1 and is connected to the evaporator 5 and the condenser 6 respectively through the four-way valve 4. The condenser 6 is disposed within the air supply channel 101 and connected to the evaporator 5 and the condenser 6 via a pipeline. It is connected to the evaporator 5; the evaporator 5 includes a main body 501, a refrigerant inlet 502, a refrigerant outlet 503 and a liquid replenishment port 504. The refrigerant inlet 502 and the refrigerant outlet 503 are spaced apart along the heat exchange direction of the main body 501. The refrigerant outlet 503 is connected to the four-way valve 4. The refrigerant inlet 502 is connected to the condenser 6 through a pipe. The liquid replenishment port 504 is located on the main body 501 near the refrigerant outlet 503 and is connected to the condenser 6 through a branch pipe 9.

[0028] Based on the above scheme, the refrigerant flow process in the dryer is as follows: Compressor 3 draws in low-temperature, low-pressure refrigerant gas returning from evaporator 5 and compresses it into high-temperature, high-pressure gas. The high-temperature, high-pressure refrigerant gas enters condenser 6. In condenser 6, the refrigerant gas exchanges heat with the air in air supply channel 101 through heat sinks, transferring heat to the air and condensing itself into high-pressure liquid refrigerant. At this time, the air in air supply channel 101 is heated, becoming hot air, which is then sent into drum 2 to heat and dry the clothes. The high-pressure liquid refrigerant is depressurized through a throttling device (such as a capillary tube or expansion valve) and enters evaporator 5. Inside evaporator 5, the refrigerant gradually evaporates from liquid to gas, absorbing heat from the air around evaporator 5, thus lowering the surface temperature of evaporator 5. At this time, if there is superheated refrigerant gas inside evaporator 5, its heat exchange efficiency will decrease. To optimize this process, a liquid replenishment port 504 is provided in the area of ​​evaporator 5 near refrigerant outlet 503. A suitable amount of liquid refrigerant or a gas-liquid two-phase mixture is added to the evaporator 5, near the refrigerant outlet 503, through the replenishment port 504. This newly added refrigerant mixes with the existing superheated refrigerant gas, reducing the proportion of superheated refrigerant gas and thus improving the overall heat transfer coefficient of the evaporator 5. The replenishment port 504 is connected to the condenser 6 via a branch pipe 9 to ensure a sufficient supply of liquid refrigerant. The evaporated refrigerant gas is then drawn back into the compressor 3, beginning a new cycle.

[0029] In this solution, by supplementing the area of ​​the evaporator 5 near the refrigerant outlet 503 with liquid refrigerant or a gas-liquid two-phase mixture, the proportion of superheated refrigerant gas is reduced, increasing the heat transfer coefficient of the evaporator 5 and thus improving the heat exchange efficiency of the dryer. Due to the improved heat exchange efficiency, the dryer requires less energy to achieve the same drying effect. Furthermore, the increased heat exchange efficiency means that more heat is transferred to the clothes within the same time frame, thereby shortening the drying time. In addition, by precisely controlling the refrigerant state, the dryer's heat pump system can operate more stably, reducing system performance fluctuations caused by a decrease in the heat transfer coefficient.

[0030] Furthermore, the evaporator 5 is a shell-and-tube heat exchanger, and the condenser 6 is a finned heat exchanger. The shell-and-tube heat exchanger, serving as the evaporator 5, consists of multiple layers of shells. The refrigerant flows inside the shells, while the heat exchange medium flows outside. This design allows for more efficient heat exchange between the refrigerant and the heat exchange medium, as the refrigerant can contact and exchange heat with the heat exchange medium multiple times during its flow, thus improving heat exchange efficiency. Simultaneously, the shell-and-tube heat exchanger has a compact structure and small footprint, which is beneficial for the miniaturization and lightweight design of the dryer. The finned heat exchanger, serving as the condenser 6, utilizes the expanded surface area effect of the fin structure to increase the contact area between the refrigerant and the air, thereby improving the heat exchange rate. The finned heat exchanger consists of a series of parallel fins with gaps between them to allow airflow. The refrigerant flows inside the fins and transfers heat to the external air through the fins. Due to the presence of the fins, the heat dissipation area of ​​the condenser 6 is greatly increased, allowing the refrigerant to condense into a liquid state more quickly, releasing more heat to the air.

[0031] Furthermore, the system also includes a gas-liquid separator 8. The compressor 3 has a first port 301 and a second port 302. The four-way valve 4 includes a main valve port and three branch valve ports respectively connected to the main valve port. The main valve port is connected to the first port 301, and the three branch valve ports are respectively connected to the evaporator 5, the condenser 6, and the gas-liquid separator 8. The gas-liquid separator 8 is connected to the second port 302. The compressor 3 has a first port 301 and a second port 302, which are used for refrigerant intake and exhaust, respectively. The four-way valve 4, as a key reversing valve in the heat pump system, has an optimized structure, including a main valve port and three branch valve ports respectively connected to the main valve port. The main valve port is connected to the first port 301 of the compressor 3 and is used to receive low-temperature, low-pressure refrigerant gas returning from the evaporator 5. The three branch valve ports are respectively connected to the evaporator 5, the condenser 6, and the gas-liquid separator 8 and are used to control the flow direction of the refrigerant within the system. A gas-liquid separator 8 is positioned between the four-way valve 4 and the second port 302 of the compressor 3. Its main function is to separate any liquid refrigerant that may be entrained in the refrigerant gas returning from the evaporator 5. During the operation of the heat pump system, due to various reasons (such as pressure changes inside the evaporator 5, fluctuations in refrigerant flow, etc.), a certain amount of liquid refrigerant may be entrained in the refrigerant gas returning from the evaporator 5. If the liquid refrigerant directly enters the compressor 3, it may cause damage to the compressor 3 or a decrease in its performance. Therefore, by setting up the gas-liquid separator 8, the liquid refrigerant can be effectively separated from the refrigerant gas, preventing it from damaging the compressor 3.

[0032] During the heat pump system's circulation process, when the refrigerant gas returning from the evaporator 5 enters the gas-liquid separator 8 through the four-way valve 4, the liquid refrigerant will settle inside the gas-liquid separator 8, while the refrigerant gas continues to flow to the second port 302 of the compressor 3. Simultaneously, the gas-liquid separator 8 is also equipped with a corresponding discharge device to discharge the separated liquid refrigerant back to the evaporator 5 or other suitable disposal location.

[0033] In addition, a replenishing valve 7 is installed on the branch pipe 9. The replenishing valve 7 is an adjustable throttling device, and its working principle is similar to a faucet or regulating valve. The opening degree of the valve can be changed by adjusting the knob, thereby controlling the flow rate of the fluid. In the heat exchange system of a heat pump dryer, the setting of the replenishing valve 7 is crucial for maintaining the stability of the refrigerant state inside the evaporator 5 and optimizing the heat exchange efficiency. When the heat transfer coefficient of the refrigerant inside the evaporator 5 decreases due to the excessive proportion of superheated refrigerant gas, the system can automatically open the replenishing valve 7, allowing an appropriate amount of liquid refrigerant or gas-liquid two-phase mixed refrigerant to enter the evaporator 5 from the condenser 6 through the branch pipe 9. This newly added refrigerant will mix with the original superheated refrigerant gas, lower its temperature and increase its heat transfer coefficient, thereby enhancing the heat exchange capacity of the evaporator 5.

[0034] Meanwhile, the liquid replenishment valve 7 also helps prevent excessive liquid refrigerant from entering the evaporator 5, which could lead to problems such as increased internal pressure in the evaporator 5, poor refrigerant flow, or decreased system performance. By precisely adjusting the opening of the liquid replenishment valve 7, the stability of the refrigerant state inside the evaporator 5 and optimal heat exchange efficiency can be ensured.

[0035] Specifically, the replenishing valve 7 is a one-way valve, a solenoid valve, or an electronic expansion valve. A one-way valve is a valve that allows fluid to flow in only one direction. It has an opening pressure; when the fluid pressure exceeds this opening pressure, the valve automatically opens, allowing fluid to pass through; when the fluid pressure is lower than the opening pressure, the valve closes to prevent backflow. In a heat pump dryer, a one-way valve can be used as an option for the replenishing valve 7 to ensure that liquid refrigerant or a gas-liquid two-phase mixture of refrigerant can only flow from the condenser 6 into the evaporator 5 in one direction through the branch pipe 9, avoiding backflow during the replenishment process.

[0036] A solenoid valve is a valve that controls the flow of fluid using electromagnetic force. It typically has one or more solenoid coils. When the coils are energized, a magnetic force attracts the valve core, causing it to move and thus changing the valve's open or closed state. In heat pump dryers, solenoid valves can serve as another option for the replenishment valve 7, enabling automated control of the replenishment process. By sending signals to the solenoid valve through the control system, the opening and closing time and degree of opening of the replenishment valve 7 can be precisely controlled, thereby achieving precise adjustment of the replenishment amount.

[0037] An electronic expansion valve is a type of valve that changes the throttling area by moving a valve needle driven by a stepper motor or servo motor. It typically offers higher control precision and response speed. In heat pump dryers, the electronic expansion valve can function not only as a throttling device to control the refrigerant flow but also as a replenishment valve. By sending signals to the electronic expansion valve through the control system, the position of the valve needle and the throttling area can be precisely controlled, thereby achieving precise adjustment and dynamic control of the replenishment amount.

[0038] In some embodiments, a filter assembly is also included, which is detachably installed within the air supply channel 101. The presence of the filter assembly is crucial during the operation of the heat pump dryer. On one hand, it effectively prevents impurities in the air from entering the drum 2, avoiding secondary contamination of the clothes; on the other hand, by regularly cleaning and replacing the filter assembly, the air supply channel 101 can be kept unobstructed, ensuring the normal operation and efficient heat exchange of the heat pump system.

[0039] Furthermore, the detachable filter assembly design offers added convenience and flexibility. Users can clean and replace the filter assembly at any time according to their usage habits and actual needs, without the need for professional assistance. This not only reduces maintenance costs but also improves user satisfaction and loyalty.

[0040] The filter component is a filter screen. The design and material selection of the filter screen are crucial to its filtration efficiency and lifespan. In this application, the filter screen may employ a multi-layer structure, with each layer performing a different filtration task. For example, a pre-filter is mainly used to block larger particles, such as hair and dust clumps; a medium-efficiency filter can further filter out smaller particles, such as dander and pollen; while a high-efficiency filter, such as a HEPA (High-Efficiency Particulate Air) filter, can filter out the vast majority of tiny particles in the air, including bacteria, viruses, and allergens.

[0041] For ease of cleaning and replacement, the filter is designed to be removable. The filter can be easily removed from the air supply duct 101. After removal, users can wash the filter with clean water or a dedicated cleaning agent to remove any attached particles and dirt. After cleaning, allow the filter to dry and then reinstall it into the air supply duct 101.

[0042] Meanwhile, the filter screen is positioned between the inlet of the air supply channel 101 and the condenser 6; or between the condenser 6 and the outlet of the air supply channel 101. When the filter screen is positioned between the inlet of the air supply channel 101 and the condenser 6, it can effectively filter out impurities in the air entering the heat pump system. In this way, only clean air will pass through the condenser 6 for heat exchange, thus avoiding the negative impact of impurities on the performance of the condenser 6. Furthermore, this position can reduce the maintenance requirements caused by the accumulation of impurities inside the condenser 6, extending the service life of the condenser 6. On the other hand, when the filter screen is positioned between the condenser 6 and the outlet of the air supply channel 101, it can further filter out small particles that may be generated during the heat exchange process. These particles may be generated by processes such as refrigerant evaporation, frosting, or defrosting inside the condenser 6 and are sent into the drum 2 with the hot air. By placing the filter screen in this position, it can be ensured that the hot air entering the drum 2 is cleaner, thereby protecting clothing from contamination.

[0043] To facilitate user maintenance and repair, a maintenance door 10 is movably connected to one side of the main body 1. This maintenance door 10 is designed to allow easy access to the dryer's internal components, such as the condenser 6, evaporator 5, compressor 3, replenishment valve 7, and filter assembly, when necessary. The maintenance door 10 is typically connected to the main body 1 via hinges, slide rails, or other connecting mechanisms to ensure stability during opening and closing. For enhanced safety, the maintenance door 10 may also be equipped with a lock or safety switch to prevent accidental opening while the equipment is running. When maintenance or repair of the heat pump dryer is required, the user can simply open the maintenance door 10 to visually inspect the condition of each component. For example, the user can check for dust accumulation on the condenser 6, frost on the evaporator 5, proper functioning of the replenishment valve 7, and whether the filter assembly needs cleaning or replacement. This design not only improves maintenance efficiency but also reduces the risk of equipment failure due to improper maintenance.

[0044] Furthermore, the presence of the service door 10 makes it easier for users to upgrade and modify the heat pump dryer. For example, when users need to replace the compressor 3 with a higher-performance one or upgrade to a more efficient filter assembly, these operations can be easily completed through the service door 10.

[0045] It is worth mentioning that the output end of the air supply channel 101 is equipped with an aromatherapy plate. The aromatherapy plate can hold aromatherapy tablets or liquids. When hot air passes through the aromatherapy plate, the fragrance components are carried by the hot air and evenly distributed onto the clothing, thus giving the clothing a long-lasting fragrance. The aromatherapy plate provides users with a variety of choices. Users can choose different scents of aromatherapy tablets or liquids according to their preferences and the occasion, such as refreshing lemon, delicate lavender, or vibrant ocean. This way, while drying clothes, they also emit a pleasant fragrance, further enhancing the comfort and enjoyment of wearing them. The aromatherapy plate is also easy to clean and replace. When the aromatherapy tablets or liquids are used up, users simply need to remove the aromatherapy plate and replace them with new tablets or add more liquid. This design not only facilitates user operation but also ensures the continuous and stable aromatherapy effect.

[0046] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other orientations or positional relationships are used only for ease of description and simplification of operation, 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, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no special meaning.

[0047] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0048] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0049] The technical principles of this application have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this application without inventive effort, and these embodiments will all fall within the scope of protection of this application.

Claims

1. A heat pump dryer, characterized in that, include: The machine body (1), drum (2), compressor (3), four-way valve (4), evaporator (5) and condenser (6) are provided. The drum (2) is rotatably installed inside the machine body (1). The machine body (1) is provided with an air supply channel (101). The output end of the air supply channel (101) is connected to the inside of the drum (2). The compressor (3) is installed inside the machine body (1). The compressor (3) is connected to the evaporator (5) and the condenser (6) respectively through the four-way valve (4). The condenser (6) is set in the air supply channel (101) and is connected to the evaporator (5) through a pipeline. The evaporator (5) includes a main body (501), a refrigerant inlet (502), a refrigerant outlet (503), and a liquid replenishment port (504). The refrigerant inlet (502) and the refrigerant outlet (503) are spaced apart along the heat exchange direction of the main body (501). The refrigerant outlet (503) is connected to the four-way valve (4). The refrigerant inlet (502) is connected to the condenser (6) through a pipe. The liquid replenishment port (504) is located on the main body (501) near the refrigerant outlet (503) and is connected to the condenser (6) through a branch pipe (9).

2. The heat pump dryer according to claim 1, characterized in that, The evaporator (5) is a shell-and-tube heat exchanger, and the condenser (6) is a finned heat exchanger.

3. The heat pump dryer according to claim 1, characterized in that, It also includes a gas-liquid separator (8), the compressor (3) has a first port (301) and a second port (302), the four-way valve (4) includes a main valve port and three branch valve ports respectively connected to the main valve port, the main valve port is connected to the first port (301), the three branch valve ports are respectively connected to the evaporator (5), the condenser (6) and the gas-liquid separator (8), and the gas-liquid separator (8) is connected to the second port (302).

4. The heat pump dryer according to any one of claims 1-3, characterized in that, A replenishing valve (7) is installed on the branch pipeline (9).

5. The heat pump dryer according to claim 4, characterized in that, The replenishing valve (7) is a one-way valve, a solenoid valve, or an electronic expansion valve.

6. The heat pump dryer according to any one of claims 1-3, characterized in that, It also includes a filter assembly, which is detachably installed within the air supply duct (101).

7. The heat pump dryer according to claim 6, characterized in that, The filtering component is a filter screen.

8. The heat pump dryer according to claim 7, characterized in that, The filter screen is disposed between the input end of the air supply channel (101) and the condenser (6); or the filter screen is disposed between the condenser (6) and the output end of the air supply channel (101).

9. The heat pump dryer according to any one of claims 1-3, characterized in that, A maintenance door (10) is movably connected to one side of the body (1).

10. The heat pump dryer according to any one of claims 1-3, characterized in that, An aromatherapy plate is provided at the output end of the air supply channel (101).

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