Clothes dryer

Abstract

The invention discloses a clothes dryer. The clothes dryer comprises a box body; the roller and the bottom air duct are arranged in the box body; the bottom air duct is communicated with the interior of the roller end to end and used for realizing air circulation of the clothes dryer; the driving device is used for providing rotating power for the roller; the heat pump system is used for exchanging heat with circulating air by using a refrigerant; a heat pump system includes: a compressor; the condenser and the evaporator are arranged in the bottom air duct; the condenser is connected with the compressor; the evaporator is connected with the compressor; the condenser is connected with the evaporator through a first pipeline, and the condenser is connected with the evaporator through a second pipeline; wherein under the condition that the temperature of a refrigerant discharged by the condenser reaches a preset first temperature or below, the first pipeline is conducted, and the second pipeline is disconnected; and under the condition that the temperature of the refrigerant discharged by the condenser reaches a preset second temperature or above, the first pipeline and the second pipeline are conducted. In this way, energy consumption can be reduced while the refrigerant is cooled.

Description

Technical Field

[0001] This application relates to the technical field of household electrical appliances, and particularly to a dryer. Background Art

[0002] A dryer is a household device used to dry wet clothes. The dryer heats fresh cold air into dry hot air through a heat pump system, and then uses the dry hot air to exchange heat with the clothes tumbling in the drum, so that the moisture contained in the clothes in the drum gradually evaporates under sufficient heat exchange with the dry hot air, thereby realizing the drying of the clothes. The drying effect of the dryer is closely related to the temperature of the refrigerant in the heat pump system. If the refrigerant temperature is low, the efficiency of heat exchange between the air circulating in the dryer and the refrigerant is low, resulting in poor drying effect; if the refrigerant temperature is high, the efficiency of heat exchange between the air circulating in the dryer and the refrigerant is high, and the drying effect is good. However, if the refrigerant temperature is too high, it will cause the temperature of the compressor to rise, resulting in the shutdown of the compressor. Therefore, during the clothes drying process, it is necessary to control the temperature of the refrigerant.

[0003] In the related art, usually a blower is arranged outside the compressor, and the compressor is used to blow air to cool the compressor and the refrigerant. Since an external blower is provided, cooling the refrigerant in this way will increase the energy consumption of the dryer.

[0004] Therefore, there is an urgent need for a dryer that can cool the refrigerant while reducing energy consumption. Summary of the Invention

[0005] This application provides a dryer that can cool the refrigerant while reducing energy consumption.

[0006] According to one aspect of the embodiments of this application, the embodiments of this application provide a dryer, including: a box body; a drum and a bottom air duct arranged in the box body; the bottom air duct is communicated end to end with the inside of the drum for realizing the air circulation of the dryer; a driving device for providing rotational power to the drum; a heat pump system for exchanging heat between the refrigerant and the circulating air; the heat pump system includes: a compressor; a condenser and an evaporator arranged in the bottom air duct; the condenser is connected to the compressor; the evaporator is connected to the compressor; the condenser is connected to the evaporator through a first pipe and the condenser is connected to the evaporator through a second pipe; wherein, when the temperature of the refrigerant discharged from the condenser reaches below a preset first temperature, the first pipe is conducted and the second pipe is open; when the temperature of the refrigerant discharged from the condenser reaches above a preset second temperature, the first pipe is conducted and the second pipe is conducted.

[0007] In the above embodiments, when the temperature of the refrigerant discharged from the condenser is lower than a preset first temperature, the refrigerant can only flow from the condenser to the evaporator through the first pipeline. When the temperature of the refrigerant discharged from the condenser is higher than a preset second temperature, the refrigerant flows from the condenser to the evaporator through both the first pipeline and the second pipeline. Since the number of pipelines between the condenser and the evaporator increases, the fluid resistance between the condenser and the evaporator becomes smaller, the pressure of the refrigerant in the condenser decreases, the power of the compressor to do work on the refrigerant decreases, and the temperature of the refrigerant decreases. Thus, without additionally arranging a blower, the temperature of the refrigerant can be reduced, and energy consumption can be reduced while cooling the refrigerant.

[0008] In an embodiment of the present application, based on the foregoing solution, a temperature control valve is provided on the second pipeline; the temperature control valve includes: a valve body, a first baffle, a bimetallic sheet, and a second baffle disposed in the valve body; through holes are provided on the first baffle, the bimetallic sheet, and the second baffle; the bimetallic sheet is disposed between the first baffle and the second baffle; wherein, when the temperature of the refrigerant discharged from the condenser reaches below the preset first temperature, the bimetallic sheet bulges towards the first baffle to block the through hole of the first baffle; when the temperature of the refrigerant discharged from the condenser reaches above the preset second temperature, the bimetallic sheet bulges towards the second baffle to open the through hole of the first baffle.

[0009] In the above embodiments, compared with setting a blower to reduce the temperature of the refrigerant, the bimetallic sheet can automatically open and close the second pipeline, thereby automatically controlling the number of pipelines between the condenser and the evaporator, and reducing energy consumption while cooling the refrigerant.

[0010] In an embodiment of the present application, based on the foregoing solution, the through hole of the first baffle is in the middle position; the through holes of the bimetallic sheet and the second baffle are in the edge positions.

[0011] In the above embodiments, when the second pipeline is open, the refrigerant can smoothly flow between the through hole in the middle position of the first baffle, the through hole in the edge position of the bimetallic sheet, and the through hole in the edge position of the second baffle.

[0012] In an embodiment of the present application, based on the foregoing solution, one end of the bottom air duct is connected to one end inside the drum through a first air duct; the first air duct is used to introduce the air inside the drum into the bottom air duct.

[0013] In an embodiment of the present application, based on the foregoing solution, the other end of the bottom air duct is connected to the other end inside the drum through a second air duct; the second air duct is used to introduce the air heat-exchanged with the refrigerant into the drum.

[0014] In the above embodiment, the bottom air duct, the first air duct, the drum and the second air duct form a loop for air circulation in the dryer, so that after the air can dry the clothes in the drum, it can be dried by using the evaporator and condenser in the bottom air duct, and the dried air can be circulated back into the drum to dry the clothes again.

[0015] In an embodiment of the present application, based on the foregoing solution, the driving device includes a motor and a belt; one end of the belt is sleeved on the motor, and the other end of the belt is sleeved on the drum.

[0016] In the above embodiment, the motor can drive the drum to rotate by using the belt, so that the dry hot air can fully mix and contact with the clothes in turnover, improving the drying effect.

[0017] In an embodiment of the present application, based on the foregoing solution, the dryer further includes: a motor shaft and an impeller; the impeller is connected to the motor through the motor shaft; the impeller is arranged in the second air duct; the second air duct is used to introduce the air heat-exchanged with the refrigerant into the drum; the motor is used to drive the impeller to rotate in the second air duct to generate wind power.

[0018] In the above embodiment, the motor can drive the impeller to rotate in the second air duct through the motor shaft to generate wind power, thereby increasing the rate of air circulation.

[0019] In an embodiment of the present application, based on the foregoing solution, the bottom air duct is provided with a water storage tank for storing the condensed water separated out when the circulating air exchanges heat with the refrigerant.

[0020] In the above embodiment, it is possible to collect the moisture in the clothes.

[0021] In an embodiment of the present application, based on the foregoing solution, the dryer further includes: a drainage pump and a water container; the water container is located at the top of the cabinet; the water container is connected to the water storage tank through the drainage pump; the drainage pump is used to drain the condensed water stored in the water storage tank into the water container.

[0022] In the above embodiment, the condensed water condensed by the evaporator accumulates in the bottom water storage tank and is drained to the top water container through the drainage pump, so as to complete the drying of the clothes.

[0023] Other features and advantages of the present application will become apparent through the following detailed description, or will be partially learned through the practice of the present application.

[0024] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts. In the drawings:

[0026] Figure 1 Shows a schematic structural diagram of the dryer according to this embodiment;

[0027] Figure 2 is Figure 2 a schematic diagram of the air duct;

[0028] Figure 3 is Figure 2 a detailed connection diagram of the condenser and the evaporator in;

[0029] Figure 4 is Figure 3 a schematic diagram of the structure of the temperature control valve in;

[0030] Figure 5 is a schematic diagram of the temperature control valve in the case where the second pipeline is open. Description of the Drawings:

[0032] 10: Dryer; 11: Cabinet; 12: Drum; 13: Driving motor; 14: Belt; 15: Motor shaft; 16: Impeller; 17: Condenser; 18: Compressor; 19: Evaporator; 31: First pipeline; 32: Second pipeline; 33: Temperature control valve; 41: Valve body; 42: First baffle; 43: Bimetallic strip; 44: Second baffle. Detailed Embodiments

[0033] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more complete and comprehensive, and will fully convey the concept of the example embodiments to those skilled in the art.

[0034] In addition, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present application. However, those skilled in the art will realize that the technical solutions of the present application can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the present application.

[0035] The present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted here that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0036] The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, but should not be construed as limiting the present application.

[0037] The method of using a compressor to blow air to cool the compressor and refrigerant will increase the energy consumption of the dryer because a blower is externally provided. To solve this problem, the present application specifically proposes a laundry treatment device.

[0038] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the dryer according to this embodiment.

[0039] As Figure 1 shown, a dryer 10 includes a cabinet 11, a drum 12, a heat pump system, a drive motor 13, a belt 14, a motor shaft 15, and an impeller 16. Among them, the heat pump system includes: a condenser 17, a compressor 18, and an evaporator 19.

[0040] Each part of the dryer 10 will be introduced one by one below.

[0041] The cabinet 11 is the overall external structure of the dryer 10 and is used to fix and protect the internal components. The cabinet 11 is a hollow structure with an internal space, in which other component structures of the dryer can be provided, such as: the drum 12, the heat pump system, the drive motor 13, the belt 14, the motor shaft 15, and the impeller 16, etc. The cabinet 11 can be arranged in a hollow rectangular parallelepiped shape or in a hollow cylindrical shape. Of course, it is not limited to the above shapes.

[0042] The cabinet 11 is usually made of metal or plastic; a door is usually provided on the cabinet 11 for putting clothes into or taking them out of the drum 12, and the door is usually equipped with a sealing ring to prevent water leakage; a display screen and a control panel are usually provided on the cabinet 11, and there are buttons, knobs, or touch screens on the control panel.

[0043] Among them, please refer to Figure 2 , Figure 2 which is Figure 2 a schematic diagram of the air duct. As Figure 2 shown, a bottom air duct 20 is also provided inside the cabinet 11, and the bottom air duct 20 is provided at the bottom of the cabinet 11. The bottom air duct is communicated with the drum 12 through a first air duct 21 and a second air duct 22 at the head and tail for realizing the air circulation of the dryer.

[0044] One end of the bottom air duct 20 is connected to one end inside the drum 12 through the first air duct 21; the first air duct 21 is used to introduce the air inside the drum into the bottom air duct; the first air duct 21 is located on the side of the box body 11 close to the evaporator 19.

[0045] The other end of the bottom air duct 20 is connected to the other end inside the drum 12 through the second air duct 22; the second air duct 22 is used to introduce the air heat-exchanged with the refrigerant into the drum 12; the second air duct 22 is located on the side of the box body close to the condenser 17.

[0046] In this way, the bottom air duct, the first air duct, the drum and the second air duct form a loop for the air circulation in the dryer, so that after the air can dry the clothes in the drum, it can be dried by using the evaporator and condenser of the bottom air duct, so that the dried air can be circulated back into the drum to dry the clothes again.

[0047] As Figure 2 shown, Figure 2 the arrows in are used to indicate the circulation direction of the air in the dryer. During the drying process of the dryer in this embodiment, the air circulates in the direction of "drum - first air duct - bottom air duct - second air duct - drum".

[0048] The heat pump system is arranged inside the box body 11 and is used to provide dry hot air into the drum. The heat pump system includes a condenser 17, a compressor 18 and an evaporator 19. Among them, the condenser 17 and the evaporator 19 are arranged in the bottom air duct.

[0049] The condenser 17 is connected to the compressor 18; the evaporator 19 is connected to the compressor 18; the condenser 17 is connected to the evaporator 19 through the first pipeline and the condenser 17 is connected to the evaporator 19 through the second pipeline; both the first pipeline and the second pipeline are capillary pipelines.

[0050] The compressor 18, the condenser 17, the first pipeline and the evaporator 19 form the first loop for the refrigerant circulation; the compressor 18, the condenser 17, the second pipeline and the evaporator 19 form the second loop for the refrigerant circulation.

[0051] In an embodiment of the present application, the compressor does work on the refrigerant in the heat pump system to convert electrical energy into the heat energy of the refrigerant. After the work done by the compressor, the temperature of the refrigerant rises and it flows to the condenser. The refrigerant in the condenser exchanges heat with the air circulating in the dryer, resulting in the decrease of the temperature of the refrigerant in the condenser and the increase of the temperature of the air. Then, the air with the increased temperature circulates from the bottom air duct through the second air duct into the drum to dry the clothes. At the same time, the refrigerant with the decreased temperature flows to the evaporator through the first pipeline and / or the second pipeline, resulting in the low temperature on the surface of the evaporator, so as to be able to condense the air circulating from the drum and the first air duct to the bottom air duct to remove the moisture in the air. Then the refrigerant returns to the compressor to start the refrigerant circulation again.

[0052] In this way, the condenser, evaporator and compressor in the heat pump system heat and dry the cold and humid air from the bottom air duct of the drum circulation in the dryer through the refrigerant circulation to obtain dry hot air.

[0053] Among them, when the temperature of the refrigerant discharged from the condenser reaches below the preset first temperature, that is, if the temperature of the refrigerant discharged from the condenser is lower than the preset first temperature, the first pipeline is connected and the second pipeline is disconnected, then the refrigerant in the heat pump system circulates through the first circuit.

[0054] When the temperature of the refrigerant discharged from the condenser reaches above the preset second temperature, that is, if the temperature of the refrigerant discharged from the condenser is greater than the preset second temperature, the first pipe is connected and the second pipe is connected, then the refrigerant in the heat pump system circulates through the first loop and the second loop.

[0055] In this way, when the temperature of the refrigerant discharged from the condenser is lower than the preset first temperature, the refrigerant can only flow from the condenser to the evaporator through the first pipe, and when the temperature of the refrigerant discharged from the condenser is higher than the preset second temperature, the refrigerant flows from the condenser to the evaporator through the first pipe and the second pipe at the same time. As the number of pipes between the condenser and the evaporator increases, the fluid resistance between the condenser and the evaporator decreases, the pressure of the refrigerant in the condenser decreases, the power of the compressor to work on the refrigerant decreases, and the temperature of the refrigerant is reduced, so that the temperature of the refrigerant can be reduced without setting up a fan, thereby reducing energy consumption while cooling the refrigerant.

[0056] In one embodiment of the present application, the second pipeline is provided with a temperature sensor and a switch device. The temperature sensor is used to detect the temperature of the refrigerant discharged from the condenser. The switch device is used to control the second pipeline to open or disconnect.

[0057] When the temperature detected by the temperature sensor is lower than the preset first temperature, the switch device controls the second pipeline to be disconnected. When the temperature detected by the temperature sensor is higher than the preset second temperature, the switch device controls the second pipeline to be open. Compared with setting up a fan to cool the temperature of the refrigerant, the energy consumption of the temperature sensor and the switch device is lower than that of the fan, thereby reducing energy consumption while cooling the refrigerant.

[0058] In another embodiment of the present application, please refer to 3, Figure 3 for Figure 2 Detailed diagram of the connection between the condenser and the evaporator. Figure 3As shown, the condenser 17 is connected to the evaporator 19 through the first pipe 31, and the condenser 17 is also connected to the evaporator 19 through the second pipe 32; a temperature control valve 33 is provided on the second pipe. The temperature control valve opens and closes the second pipe according to the temperature of the refrigerant flowing out of the condenser.

[0059] Please refer to Figure 4 , Figure 4 which is Figure 3 a schematic diagram of the structure of the temperature control valve in []. The temperature control valve 33 includes: a valve body 41, a first baffle 42, a bimetallic strip 43 and a second baffle 44 provided in the valve body 41. The first baffle 42 and the second baffle 44 are arranged in parallel in the valve body 41, and the bimetallic strip 43 is arranged between the first baffle 42 and the second baffle 44.

[0060] The bimetallic strip 43 is a composite material composed of two or more metals with different coefficients of thermal expansion. When the temperature changes, the bimetallic strip will deform and bend to one side.

[0061] The first baffle 42, the bimetallic strip 43 and the second baffle 44 are provided with through holes. Among them, when the temperature of the refrigerant discharged from the condenser 17 reaches below the preset first temperature, the bimetallic strip 43 bulges towards the first baffle 42 to block the through hole of the first baffle 42; when the temperature of the refrigerant discharged from the condenser 17 reaches above the preset second temperature, the bimetallic strip 43 bulges towards the second baffle 44 to open the through hole of the first baffle 42. In this way, compared with setting a fan to reduce the temperature of the refrigerant, the bimetallic strip can automatically open and close the second pipe, thereby automatically controlling the number of pipelines between the condenser and the evaporator, and reducing energy consumption while cooling the refrigerant.

[0062] The through hole of the first baffle 42 is in the middle position; the through holes of the bimetallic strip 43 and the second baffle 44 are in the edge positions. In this way, when the second pipeline is open, the refrigerant can smoothly flow between the through hole in the middle position of the first baffle, the through hole in the edge position of the bimetallic strip, and the through hole in the edge position of the second baffle.

[0063] A through hole is also provided in the middle position of the second baffle 44. In this way, when the bimetallic strip bulges towards the second baffle, the collision between the bimetallic strip and the second baffle can be avoided, thereby reducing the probability of damage to the temperature control valve.

[0064] Please refer to Figure 4 , as Figure 4 shown, when the temperature of the refrigerant discharged from the condenser 17 reaches below the preset first temperature, the bimetallic strip 43 bulges towards the first baffle 42 to block the through hole of the first baffle 42, resulting in the second pipe being cut off.

[0065] Please refer toFigure 5 , Figure 5 Schematic diagram of the temperature control valve when the second pipeline is open. As Figure 5 shown, when the temperature of the refrigerant discharged from the condenser 17 reaches above the preset second temperature, the bimetal 43 bulges towards the second baffle 44 to open the through-hole of the first baffle 42. In this way, the refrigerant flows out from the through-hole at the middle position of the first baffle, the bimetal, and the through-hole at the edge position of the second baffle.

[0066] The drive motor 13 is the power source of the dryer 10. The drive motor 13, the belt 14, and the drum 12 form a transmission system. One end of the belt 14 is sleeved on the drive motor 13, and the other end of the belt 14 is sleeved on the drum 12 through a pulley. When the drive motor 13 rotates, relying on the frictional force generated when the belt and the pulley are tightened, the power of the drive motor 13 is transmitted to the drum 12 to realize the rotation of the drum. In this way, the dry hot air can fully mix and contact with the clothes being flipped, improving the drying effect.

[0067] The drive motor 13, the motor shaft 15, and the impeller 16 form a gas power system.

[0068] The impeller 16 is connected to the drive motor 13 through the motor shaft 15; the impeller 16 is arranged in the second air duct; the drive motor 13 drives the impeller 16 to rotate in the second air duct through the motor shaft 15 to generate wind force, thereby increasing the rate of air circulation. At the same time, there is no need to use a blower or a fan to accelerate the circulation rate, further reducing the energy consumption and cost of the dryer.

[0069] Furthermore, a water storage tank is also provided in the bottom air duct, and the water storage tank is used to store the condensed water separated out when the circulating air exchanges heat with the refrigerant. The water storage tank is located at the bottom of the bottom air duct.

[0070] In this way, the collection of moisture in the clothes is realized.

[0071] Furthermore, the dryer also includes a drainage pump and a water container. The water container is located at the top of the cabinet 11; the water container is connected to the water storage tank through the drainage pump. The drainage pump is used to drain the condensed water stored in the water storage tank into the water container. The water container can be taken out of the cabinet 11 to facilitate the reuse of the condensed water.

[0072] In this way, the condensed water condensed by the evaporator accumulates in the bottom water storage tank and is discharged to the top water container through the drainage pump. The water container can be taken out to clean the water inside. Finally, the circulating gas will separate all the water in the clothes at the evaporator, completing the drying of the clothes.

[0073] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0074] In the present application, unless otherwise clearly specified and defined, terms such as "assembly" and "connection" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. In the description of this specification, the description with reference to terms such as "some embodiments" and "exemplarily" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0075] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and the description of the present application shall fall within the scope covered by the patent of the present application.

Claims

1. A dryer, characterized in that, include: Box; A drum and a bottom air duct are arranged in the box; the bottom air duct is connected end to end with the inside of the drum, and is used to realize air circulation of the clothes dryer; A driving device for providing rotational power to the drum; Heat pump system, used to exchange heat between refrigerant and circulating air; The heat pump system comprises: compressor; A condenser and an evaporator are arranged in the bottom air duct; the condenser is connected to the compressor; the evaporator is connected to the compressor; The condenser is connected to the evaporator via a first pipe, and the condenser is connected to the evaporator via a second pipe; Among them, when the temperature of the refrigerant discharged from the condenser reaches below a preset first temperature, the first pipeline is connected and the second pipeline is disconnected; when the temperature of the refrigerant discharged from the condenser reaches above a preset second temperature, the first pipeline is connected and the second pipeline is connected.

2. The dryer according to claim 1, characterized in that, The second pipeline is provided with a temperature control valve; the temperature control valve comprises: a valve body, a first baffle, a bimetallic strip and a second baffle arranged in the valve body; the first baffle, the bimetallic strip and the second baffle are provided with through holes; the bimetallic strip is arranged between the first baffle and the second baffle; When the temperature of the refrigerant discharged from the condenser reaches below a preset first temperature, the bimetallic strip protrudes toward the first baffle to block the through hole of the first baffle; when the temperature of the refrigerant discharged from the condenser reaches above a preset second temperature, the bimetallic strip protrudes toward the second baffle to open the through hole of the first baffle.

3. The dryer according to claim 2, characterized in that, The through hole of the first baffle is located in the middle; the through holes of the bimetallic strip and the second baffle are located at the edge.

4. The dryer according to claim 1, characterized in that, One end of the bottom air duct is connected to one end of the inside of the drum through a first air duct; the first air duct is used to guide the air in the drum into the bottom air duct.

5. The dryer according to claim 4, characterized in that, The other end of the bottom air duct is connected to the other end of the inside of the drum through a second air duct; the second air duct is used to introduce the air after heat exchange with the refrigerant into the drum.

6. The dryer according to claim 1, characterized in that, The driving device comprises a motor and a belt; one end of the belt is sleeved on the motor, and the other end of the belt is sleeved on the roller.

7. The dryer according to claim 6, characterized in that, Also includes: A motor shaft and an impeller; the impeller is connected to the motor via the motor shaft; the impeller is arranged in a second air duct; the second air duct is used to introduce air after heat exchange with a refrigerant into the drum; the motor is used to drive the impeller to rotate in the second air duct to generate wind force.

8. The dryer according to claim 1, characterized in that, The bottom air duct is provided with a water storage tank for storing condensed water precipitated when the circulating air exchanges heat with the refrigerant.

9. The dryer according to claim 8, characterized in that, Also includes: A drainage pump and a water container; the water container is located on the top of the box; the water container is connected to the water storage tank through the drainage pump; The drainage pump is used to drain the condensed water stored in the water storage tank into a water container.

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