Clothes drying device and control method thereof

Abstract

The present invention provides a clothes drying device and a control method thereof, wherein the clothes drying device comprises a clothes drying drum, an air duct and a heat pump system, wherein the heat pump system comprises a compressor, a condenser and an evaporator, and an auxiliary heating device is arranged on the condenser. The present invention arranges an auxiliary heating device in the heat pump system of the clothes drying device, and arranges the auxiliary heating device on the condenser, so that the heat pump system heats up quickly, and also increases the temperature inside the drum, thereby accelerating the drying speed of the clothes. In addition, the control method provided in the present application performs intermittent heating of the clothes after the clothes are dried, so that the clothes can be kept dry and clean without the user taking out the clothes, and the growth of bacteria can be prevented, which plays an important protective role in the health of the user. The present invention has a simple structure, can significantly shorten the drying time of the clothes, and is more energy-efficient.

Description

Technical Field

[0001] The present invention relates to the field of laundry and drying, and in particular to a laundry drying device and a control method thereof. Background Art

[0002] With the development of social economy, clothes drying equipment has been widely used, especially in areas with high humidity. The drying function of clothes drying equipment meets people's needs for clothes to be dried quickly. Common laundry drying equipment or clothes drying equipment drying systems generally include electric heating water condensation drying system, electric heating air condensation drying system, and heat pump heating drying system with evaporator condensation combined with condenser heating. Compared with the first two drying systems, the heat pump heating drying system is relatively energy-saving and has a broader market application prospect.

[0003] When the ambient temperature of the existing heat pump clothes drying equipment is relatively low (for example, less than 15°C), more heat is needed to make all the parts of the dryer reach a suitable working state. The temperature rise rate of the whole system is about 40% slower than that at the normal temperature of 23°C, which causes the drying time to be prolonged. Moreover, the temperature inside the drum is also relatively low during operation, and a good drying effect cannot be achieved, which affects the user experience. In addition, the existing heat pump clothes drying equipment will directly shut down after drying. If the user does not take out the clothes in time, the clothes will slowly get cold over time, and the clothes will feel bad when they are taken out. Moreover, if the clothes are not taken out for a long time, it may cause odor or breed bacteria, affecting the health of the user. Summary of the invention

[0004] The problem to be solved by the present invention is that in the prior art, the heat pump clothes drying equipment heats up slowly when the ambient temperature is low, the clothes drying time is long, and after the clothes are dried, the user does not take them out for a long time, which makes it easy for the clothes to have odor or bacteria.

[0005] In order to solve the above problems, the present invention provides a clothes drying device and a control method thereof. An auxiliary heating device is arranged in the heat pump system of the clothes drying device, and the auxiliary heating device is arranged in the gap of the condenser, so that the heat pump system heats up quickly, and the temperature inside the drum is also increased, thereby accelerating the drying speed of the clothes. In addition, the control method provided in the present application performs intermittent heating of the clothes after the clothes are dried, so that the clothes can be kept dry and clean without the user taking out the clothes, thereby preventing the growth of bacteria.

[0006] The present invention discloses a clothes drying device, comprising a clothes drying drum, an air duct and a heat pump system. The heat pump system comprises a compressor, a condenser and an evaporator, and is characterized in that an auxiliary heating device is arranged on the condenser.

[0007] When the ambient temperature is low, more heat is needed to make all the parts of the dryer reach the appropriate working temperature. By setting an auxiliary heating device on the condenser, the passing air can be quickly heated, thereby quickly increasing the temperature of the dryer drum and the gas passing through the heat exchanger surface. The circulating air also heats the parts in the air duct, thereby shortening the heating time of the heat pump system and achieving the purpose of quickly drying clothes. The auxiliary heating device can be set in the middle of the condenser or can be set on the condenser.

[0008] Furthermore, the condenser includes at least two interconnected heat exchange components, there is a gap between adjacent heat exchange components, and an auxiliary heating device is provided in at least one of the gaps.

[0009] There is at least one gap between the condensers. The condensers can be placed in parallel with the evaporators or perpendicular to the evaporators. The auxiliary heating device can be directly arranged in the gap or can be mounted on the heat exchange assembly through the gap.

[0010] Furthermore, the compressor is arranged between the outlet of the evaporator and the inlet of the condenser, the exhaust pipe of the compressor is connected to the condenser through a first pipeline, and the heat pump system also includes a throttling device, the two ends of the throttling device are respectively connected to the outlet of the condenser and the inlet of the evaporator.

[0011] The evaporator is used to absorb heat and vaporize the refrigerant and then send it into the compressor. The compressor converts the vaporized refrigerant into high-pressure and high-temperature gas and sends it into the condenser. The condenser is used to release heat from the high-pressure and high-temperature gas to heat the air passing through its surface. The throttling device is used to convert the high-temperature and high-pressure refrigerant sent out from the condenser into low-pressure and low-temperature refrigerant and send it into the evaporator, thereby realizing the recycling of the refrigerant.

[0012] Furthermore, a first temperature sensor is provided on the compressor exhaust pipe, and a second temperature sensor is provided at the outlet of the condenser.

[0013] A plurality of temperature sensors are provided in the clothes drying device of the present application for monitoring the ambient temperature in real time so as to perform different operations when the ambient temperature reaches a preset value, thereby saving energy and time.

[0014] Furthermore, the air duct includes an air inlet duct and an air outlet duct, the air outlet of the air inlet duct is connected to the air inlet of the drying drum, the air inlet of the air outlet duct is connected to the air outlet of the drying drum, the other ends of the air inlet duct and the air outlet duct are both connected to the heat pump system, the evaporator is arranged near the air outlet of the air outlet duct, and the condenser is arranged near the entrance of the air inlet duct.

[0015] The air inlet duct is used to convey the hot dry air into the drying drum so as to dry the clothes in the drying drum. During drying, the moisture in the clothes evaporates and turns into water vapor. The air outlet duct is used to discharge the humid hot air containing water vapor after drying the clothes from the drying drum, so as to convey new hot dry air through the air inlet duct to continuously dry the clothes. The air outlet duct conveys the humid hot air into the heat pump system. The heat pump system processes the humid hot air, converts it into dry hot air, and then conveys it into the air inlet duct, so as to realize the air circulation in the clothes drying device described in the present application. When the humid hot gas discharged from the air outlet duct passes through the evaporator, the refrigerant in the evaporator absorbs heat and vaporizes. At this time, the humid hot air is cooled, and the water vapor contained therein is condensed and discharged to become low-temperature dry air. When the low-temperature dry air passes through the condenser, it absorbs the heat released by the refrigerant therein, thereby being quickly heated into dry hot air. The dry hot air is conveyed into the drying drum through the air inlet duct to dry the clothes.

[0016] Furthermore, the clothes drying device also includes a circulation fan, which is arranged in the air inlet duct and is used to send the hot air passing through the heat pump system into the drying drum.

[0017] The circulating fan is used to send hot dry air into the drying drum, thereby promoting the air flow in the system to dry the clothes.

[0018] Furthermore, a third temperature sensor is provided at the air inlet of the air outlet duct.

[0019] The third temperature sensor is also used to monitor the ambient temperature, and is mainly used to detect the time period during which the user has not taken out the clothes after the drying work is completed, so as to perform different operations according to the monitoring results. It should be noted that a humidity sensor is also provided at the air inlet of the air outlet duct, and the humidity sensor is used to monitor the dryness of the clothes, so as to determine whether the drying work is completed.

[0020] Furthermore, the auxiliary heating device is a ceramic PTC heater and / or an electric heating tube.

[0021] At least one auxiliary heating device is arranged in the gap of the condenser. Both the ceramic PTC heater and the electric heating tube have the characteristics of fast heating speed and uniform heating, and can quickly reach the target temperature. When more than two auxiliary heating devices are arranged in the system, the auxiliary heating devices can all be ceramic PTC heaters or all be electric heating tubes, or a mixture of ceramic PTC heaters and electric heating tubes.

[0022] Furthermore, the heat exchange component is one or a combination of a copper-aluminum heat exchanger, a microchannel heat exchanger, an aluminum tube and aluminum fin heat exchanger, and an all-aluminum heat exchanger.

[0023] The heat exchange component can be copper-aluminum + copper-aluminum, copper-aluminum + microchannel, microchannel + microchannel, aluminum tube + aluminum tube, or a combination of the above heat exchangers, and is specifically set according to the model, function and space size of the equipment.

[0024] The present invention also discloses a control method for a clothes drying device, which is used to control the clothes drying device as described above. The control method comprises the following steps:

[0025] S1: Turn on the clothes drying device;

[0026] S2: Detect the ambient temperature t1, and compare the detected ambient temperature t1 with the first preset temperature T1. When t1<T1, execute S3; when t1≥T1, execute S4;

[0027] S3: Turn on the auxiliary heating device, and turn off the auxiliary heating device when it is detected that the ambient temperature reaches a fourth preset temperature T4, wherein T4 ≥ T1;

[0028] S4: Drying clothes;

[0029] S5: Prompt the user after drying is completed;

[0030] S6: after the first preset time M1, if the user takes out the clothes, the machine is turned off and the work ends; if the user does not take out the clothes, S7 is executed;

[0031] S7: If it is detected that the ambient temperature t1 is less than the second preset temperature T2, if yes, the circulating fan and the auxiliary heating device are turned on, otherwise, S6 is executed;

[0032] S8: When the second preset time M2 is run and / or the ambient temperature t1 is detected to be ≥ the third preset temperature T3, wherein T3>T2, the auxiliary heating device and the circulating fan are turned off;

[0033] S9: Determine whether the time from the completion of drying the clothes to the present reaches the preset total time M3. If yes, shut down the machine and end the work; if no, execute S6;

[0034] During the execution of any one of S6 to S9, if the user takes out the clothes, the operation will be terminated immediately and the machine will be turned off.

[0035] The ambient temperature t1 is the temperature in the system pipeline or air duct. Specifically, the ambient temperature t1 is the detection result of any one of the first temperature sensor, the second temperature sensor, and the third temperature sensor. According to the above control method, within the preset time period M3 after the clothes drying device completes the drying work, if the user has not taken out the clothes after the interval M1, and it is detected that the ambient temperature is lower than the second preset temperature T2, the circulating fan and the auxiliary heating device are turned on. Specifically, the circulating fan is turned on first, and then the auxiliary heating device is turned on to heat the clothes. When the operation interval M2 and / or the ambient temperature is detected to be greater than the third preset temperature T3, the circulating fan and the auxiliary heating device are turned off. Then, if it is determined that the time from the end of drying to the current time has not reached the preset total time M3, S6-S9 are executed cyclically to ensure that the clothes are always in a dry environment to prevent bacteria from growing. During the execution of any link from S6 to S9, as long as the user takes out the clothes, the work is immediately ended, making the use of the clothes drying device described in the present application more humane and energy-saving.

[0036] Compared with the prior art, the clothes drying device and the control method thereof described in the present invention have the following advantages: the present invention arranges an auxiliary heating device in the heat pump system of the clothes drying device, and arranges the auxiliary heating device on the condenser, so that the heat pump system heats up quickly, and also increases the temperature inside the drum, thereby accelerating the drying speed of the clothes. In addition, the control method provided in the present application performs intermittent heating of the clothes after the clothes are dried, which can keep the clothes dry and clean without the user taking out the clothes, prevents the growth of bacteria, and plays an important protective role in the health of the user. The present invention has a simple structure, can significantly shorten the drying time of clothes, and is more energy-efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the structure of a clothes drying device according to an embodiment of the present invention;

[0038] Figure 2 It is a structural schematic diagram of the heat pump system according to an embodiment of the present invention;

[0039] Figure 3 This is a flow chart of a method for controlling a clothes drying device according to an embodiment of the present invention.

[0040] Description of reference numerals:

[0041] 1. Drying drum; 2. Air outlet duct; 3. Air inlet duct; 4. Circulation fan; 5. Compressor; 6. Condenser; 7. Throttling device; 8. Evaporator; 9. First pipeline; 10. Auxiliary heating device; 11. Second pipeline; 12. First temperature sensor; 13. Second temperature sensor; 14. Third temperature sensor. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] A clothes drying device and a control method thereof according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] Example 1

[0045] This embodiment provides a clothes drying device, such as Figure 1 As shown, the clothes drying device includes a drying drum 1, an air duct and a heat pump system. The heat pump system includes a compressor 5, a condenser 6 and an evaporator 8. An auxiliary heating device 10 is provided on the condenser 6. When the ambient temperature is low, more heat is required to allow all parts of the dryer to reach a suitable operating temperature, and the temperature rise rate is slow, which affects the operation efficiency of the entire heat pump system. By arranging the auxiliary heating device 10 in the middle of the condenser 6, the passing air can be quickly heated, thereby quickly increasing the temperature of the drying drum 1 and the gas passing through the surface of the evaporator 8, thereby shortening the heating time of the heat pump system and achieving the purpose of quickly drying clothes. Specifically, the auxiliary heating device 10 can be arranged in the middle of the condenser 6, or can be sleeved on the condenser 6.

[0046] As a preferred embodiment, the condenser 6 includes at least two interconnected heat exchange components, there is a gap between adjacent heat exchange components, an auxiliary heating device 10 is arranged in at least one gap, there is at least one gap between the condensers 6, the placement direction of the condenser 6 can be parallel to the evaporator 8, and can also be perpendicular to the evaporator 8. The auxiliary heating device 10 can be directly arranged in the gap, and can also be arranged on the heat exchange component through the gap.

[0047] In this embodiment, the compressor 5 is arranged between the outlet of the evaporator 8 and the inlet of the condenser 6, and the exhaust pipe of the compressor 5 is connected to the condenser 6 through the first pipeline 9. The heat pump system also includes a throttling device 7, and the two ends of the throttling device 7 are respectively connected to the outlet of the condenser 6 and the inlet of the evaporator 8. The evaporator 8 is used to absorb heat and vaporize the refrigerant and then send it into the compressor 5. The compressor 5 converts the vaporized refrigerant into a high-pressure and high-temperature gas and sends it to the condenser 6. The condenser 6 is used to release heat from the high-pressure and high-temperature gas to heat the air passing through its surface. The throttling device 7 is used to convert the high-pressure and low-temperature refrigerant sent from the condenser 6 into a low-pressure and low-temperature refrigerant and send it to the evaporator 8, thereby realizing the recycling of the refrigerant.

[0048] Preferably, a first temperature sensor 12 is provided on the exhaust pipe of the compressor 5, and a second temperature sensor 13 is provided at the outlet of the condenser 6. A plurality of temperature sensors are provided in the clothing drying device of the present application for real-time monitoring of the ambient temperature so as to perform different operations when the ambient temperature reaches a preset value, thereby saving energy and time.

[0049] In this embodiment, the air duct includes an air inlet duct 3 and an air outlet duct 2, the air outlet of the air inlet duct 3 is communicated with the air inlet of the drying drum 1, the air inlet of the air outlet duct 2 is communicated with the air outlet of the drying drum 1, the other ends of the air inlet duct 3 and the air outlet duct 2 are both communicated with the heat pump system, the evaporator 8 is arranged at a position close to the air outlet of the air outlet duct 2, the condenser 6 is arranged at a position close to the entrance of the air inlet duct 3, the air inlet duct 3 is used to transport dry hot air into the drying drum 1, so as to dry the clothes in the drying drum 1. During drying, the moisture in the clothes evaporates and becomes water vapor, and the water vapor is mixed with the air in the drying drum 1 to become humid hot air, and the air outlet duct 2 is used to transfer the wet air containing water vapor after drying the clothes to the humid hot air. The hot air is discharged from the drying drum 1 so that new dry hot air can be sent in through the air inlet duct 3 to continuously dry the clothes. The air outlet duct 2 transports the humid hot air into the heat pump system. The heat pump system processes the humid hot air, converts it into dry hot air, and then sends it into the air inlet duct 3 to realize the air circulation in the clothes drying device described in the present application. When the humid hot gas discharged from the air outlet duct 2 passes through the evaporator 8, the refrigerant in the evaporator 8 absorbs heat and vaporizes. At this time, the humid hot air is cooled, and the water vapor contained in it is condensed and discharged to become low-temperature dry air. When the low-temperature dry air passes through the condenser 6, it absorbs the heat released by the refrigerant therein, thereby being quickly heated into dry hot air. The dry hot air is sent into the drying drum 1 through the air inlet duct 3 to dry the clothes.

[0050] Specifically, the clothes drying device also includes a circulating fan 4, which is arranged in the air inlet duct 3 and is used to send the hot air passing through the heat pump system into the drying drum 1. The circulating fan 4 is used to send dry hot air into the drying drum 1, thereby promoting the air flow in the system to achieve drying of clothes.

[0051] Preferably, a third temperature sensor 14 is provided at the air inlet of the air outlet duct 2. The third temperature sensor 14 is also used to monitor the ambient temperature, and is mainly used to detect the time period during which the user has not taken out the clothes after the drying work is completed, so as to perform different operations according to the monitoring results. It should be noted that a humidity sensor is also provided at the air inlet of the air outlet duct 2. The humidity sensor is used to monitor the dryness of the clothes, so as to determine whether the drying work is completed.

[0052] Specifically, the auxiliary heating device 10 is a ceramic PTC heater and / or an electric heating tube. At least one auxiliary heating device 10 is arranged in the gap of the condenser 6. Both the ceramic PTC heater and the electric heating tube have the characteristics of fast heating speed and uniform heating, and can quickly reach the target temperature. When more than two auxiliary heating devices 10 are arranged in the system, the auxiliary heating devices 10 can all be ceramic PTC heaters or all be electric heating tubes, or a mixture of ceramic PTC heaters and electric heating tubes.

[0053] In this embodiment, the heat exchange component is a copper-aluminum heat exchanger, a microchannel heat exchanger, an aluminum tube and aluminum fin heat exchanger, an all-aluminum heat exchanger, or a combination of several thereof. The heat exchange component can be copper-aluminum + copper-aluminum, copper-aluminum + microchannel, microchannel + microchannel, aluminum tube + aluminum tube, aluminum tube + aluminum fin, or a combination of the above heat exchangers. The combination schemes of the above heat exchangers are all within the protection scope of this application, and are specifically set according to the model, efficacy and space size of the equipment.

[0054] Example 2

[0055] This embodiment provides a control method for a clothes drying device. Figure 2 As shown, the control method comprises the following steps:

[0056] S1: Turn on the clothes drying device;

[0057] S2: Detect the ambient temperature t1, and compare the detected ambient temperature t1 with the first preset temperature T1. When t1<T1, execute S3; when t1≥T1, execute S4;

[0058] S3: turning on the auxiliary heating device, and turning off the auxiliary heating device when it is detected that the ambient temperature reaches a fourth preset temperature T4, where T4 ≥ T1;

[0059] S4: Drying clothes;

[0060] S5: Prompt the user after drying is completed;

[0061] S6: after the first preset time M1, if the user takes out the clothes, the machine is turned off and the work ends; if the user does not take out the clothes, S7 is executed;

[0062] S7: Detecting that the ambient temperature t1 is less than the second preset temperature T2, if yes, then turning on the circulating fan and the auxiliary heating device, otherwise, executing S6;

[0063] S8: When the second preset time M2 is run and / or the ambient temperature t1 is detected to be ≥ the third preset temperature T3, wherein T3>T2, the auxiliary heating device and the circulating fan are turned off;

[0064] S9: Determine whether the time from the completion of drying the clothes to the present reaches the preset total time M3. If yes, shut down the machine and end the work; if no, execute S6;

[0065] During the execution of any one of S6 to S9, if the user takes out the clothes, the operation will be terminated immediately and the machine will be turned off.

[0066] According to the above control method, within the preset time period M3 after the clothes drying device completes the drying work, if the user has not taken out the clothes after the interval M1, and the ambient temperature is detected to be lower than the second preset temperature T2, the circulating fan and the auxiliary heating device are turned on. Specifically, the circulating fan is turned on first, and then the auxiliary heating device is turned on to heat the clothes. When the operating interval time M2 and / or the ambient temperature is detected to be greater than the third preset temperature T3, the circulating fan and the auxiliary heating device are turned off. Then, if it is determined that the time from the end of drying to the current time has not reached the preset total time M3, S6-S9 are executed in a loop to ensure that the clothes are always in a dry environment to prevent bacterial growth. During the execution of any link from S6 to S9, as long as the user takes out the clothes, the work is terminated immediately, making the use of the clothes drying device described in the present application more humane and energy-saving.

[0067] It should be noted that M3 can be set by the user, and can generally be set between 1 and 24 hours. The ambient temperature t1 is the temperature in the system pipeline or air duct. Specifically, the ambient temperature t1 can be the detection result of any one of the first temperature sensor, the second temperature sensor, and the third temperature sensor. The second preset temperature T2 can also be set by the customer. Generally, T2 can be defined as three ranges: high temperature, medium temperature, and low temperature. Specifically, the high temperature range is 45 to 75°C; the medium temperature range is 30 to 45°C; the low temperature range is less than 30°C. Preferably, T4>15°C. As an embodiment of the present invention, T3=T2+T x , where T x It is the preset temperature increase, specifically, 0 <T x <25℃.

[0068] It should be noted that all the terms used in the present invention to indicate directionality and position, such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "inner", "outer", "top", "lower", "head end", "tail end", "center", etc., are only used to explain the relative positional relationship and connection status between the components in a certain state, and are only for the convenience of describing the present invention, rather than requiring the present invention to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0069] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A control method for a clothes drying device, the clothes drying device comprising a clothes drying drum (1), an air duct and a heat pump system, the heat pump system comprising a compressor (5), a condenser (6) and an evaporator (8), characterized in that: The condenser (6) is provided with an auxiliary heating device (10); The control method of the clothes drying device comprises the following steps: S1: Turn on the clothes drying device; S2: Detect the ambient temperature t1, compare the detected ambient temperature t1 with the first preset temperature T1, when t1<T1, execute S3; when t1≥T1, execute S4; S3: turning on the auxiliary heating device, and turning off the auxiliary heating device when it is detected that the ambient temperature reaches a fourth preset temperature T4, where T4 ≥ T1; S4: Drying clothes; S5: Prompt the user after drying is completed; S6: After the first preset time M1, the user takes out the clothes, and then the machine is turned off and the work ends; If the user does not take out the clothes, execute S7; S7: If it is detected that the ambient temperature t1 is less than the second preset temperature T2, if yes, the circulating fan and the auxiliary heating device are turned on, otherwise, S6 is executed; S8: When the second preset time M2 is run and / or the ambient temperature t1 is detected to be ≥ the third preset temperature T3, wherein T3>T2, the auxiliary heating device and the circulating fan are turned off; S9: Determine whether the time from the completion of drying the clothes to the present reaches the preset total time M3, if yes, shut down the machine and end the work; If no, execute S6; During the execution of any one of S6 to S9, if the user takes out the clothes, the operation will be terminated immediately and the machine will be turned off.

2. A clothes drying device, using the control method according to claim 1, characterized in that: The condenser (6) comprises at least two interconnected heat exchange components, a gap exists between adjacent heat exchange components, and an auxiliary heating device (10) is provided in at least one of the gaps.

3. A clothes drying device according to claim 2, characterized in that: The compressor (5) is arranged between the outlet of the evaporator (8) and the inlet of the condenser (6); the exhaust pipe of the compressor (5) is connected to the condenser (6) via a first pipeline (9); the heat pump system further comprises a throttling device (7); two ends of the throttling device (7) are respectively connected to the outlet of the condenser (6) and the inlet of the evaporator (8).

4. A clothes drying device according to claim 3, characterized in that: A first temperature sensor (12) is arranged on the exhaust pipe of the compressor (5), and a second temperature sensor (13) is arranged at the outlet of the condenser (6).

5. A clothes drying device according to any one of claims 2 to 4, characterized in that: The air duct comprises an air inlet duct (3) and an air outlet duct (2); the air outlet of the air inlet duct (3) is connected to the air inlet of the drying drum (1); the air inlet of the air outlet duct (2) is connected to the air outlet of the drying drum (1); the other ends of the air inlet duct (3) and the air outlet duct (2) are both connected to a heat pump system; the evaporator (8) is arranged near the air outlet of the air outlet duct (2); and the condenser (6) is arranged near the entrance of the air inlet duct (3).

6. The clothes drying device according to claim 5, characterized in that: The clothes drying device further comprises a circulating fan (4), which is arranged in the air inlet duct (3) and is used to send hot air passing through the heat pump system into the clothes drying drum (1).

7. The clothes drying device according to claim 5, characterized in that: The air inlet of the air outlet duct (2) is provided with a third temperature sensor (14).

8. The clothes drying device according to claim 2, characterized in that: The auxiliary heating device (10) is a ceramic PTC heater and / or an electric heating tube.

9. The clothes drying device according to claim 2, characterized in that: The heat exchange component is one of a copper-aluminum heat exchanger, a microchannel heat exchanger, an aluminum tube and aluminum fin heat exchanger, and an all-aluminum heat exchanger, or a combination of several of them.

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