An air duct system of a clothes dryer, a clothes dryer, and a control method of the clothes dryer

Abstract

The application discloses a kind of air duct system of clothes dryer, clothes dryer and the control method of clothes dryer, air duct system includes, drum;Air outlet, with the drum communication, for after heat exchange wind is discharged;Further include, air inlet part, it is arranged on the lateral wall of the drum, for into hot air into drum;Send exhaust device, air supply end is rotatably connected with the lateral wall of the drum, can be communicated with the air inlet part, air exhaust end can be communicated with the air outlet, for after heating again from the wind in drum is sent into drum, cycle to supply heat in drum.The air inlet part of the application is arranged on the lateral wall of the drum, since clothes are mainly distributed along circumferential direction on the lateral wall of the drum during drying process, can increase the contact area of hot air and clothes, improve drying efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of household appliances, and particularly relates to an air duct system, a clothes dryer and a control method of the clothes dryer. BACKGROUND

[0002] The clothes dryer is a cleaning household appliance which uses heated air to evaporate and dry the moisture in the washed clothes. The clothes dryer is favored by people because of its fast drying clothes. With the increasing market demand for clothes dryers, the drying effect of clothes is also increasingly required. The existing drum-type clothes dryer mostly adopts the method of heating air at the bottom of the drum. The heated air contacts the clothes to evaporate the moisture in the clothes and realize drying of the clothes. However, the heated air at the bottom of the drum is driven by the fan to pass through the air duct and the air inlet and then enters the drum through the air holes at the bottom of the drum. The contact surface with the clothes is relatively small, the combination of the heated air and the moisture in the clothes is too slow, which is not conducive to evaporation of the moisture, and the drying time of the clothes is too long.

[0003] A clothes dryer is disclosed in Chinese Patent No. CN201921872509.X, which comprises a box body, a drying unit and a heating unit. The box body is a hollow structure. A motor is arranged on the rear side of the box body. An installation groove is arranged on the front side of the box body. A drum is arranged in the installation groove. Vent holes are uniformly arranged on the inner side of the drum. An annular heating air duct is arranged on the outer side of the drum. The inner cavity side of the annular heating air duct is in rolling connection with the outer side of the drum. The side of the drum is fixedly connected with the output shaft of the motor through a connecting rod. A drum door is arranged on the front side of the box body. The drum door is in rotary connection with the drum through a rotating shaft. A touch display and an adjusting knob are arranged on the front side of the box body.

[0004] The clothes dryer in the above scheme also takes in air through the side wall of the drum. The annular heating air duct needs to be arranged on the outside of the side wall of the drum. The hot air enters the annular heating air duct and then enters the drum through the air inlet holes on the side wall of the drum. However, since the annular heating air duct covers the entire side wall of the drum, the hot air entering the annular heating air duct cannot completely and effectively enter the drum, which leads to waste of heat and reduces the utilization rate of the hot air.

[0005] In view of the above technical defects, the present application is proposed. SUMMARY

[0006] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide an air duct system of a clothes dryer which can improve drying efficiency.

[0007] To solve the above technical problems, the basic idea of the technical scheme of the present application is as follows:

[0008] An air duct system of a clothes dryer comprises,

[0009] a drum;

[0010] an air outlet, in communication with the drum, for discharging the heat-exchanged air;

[0011] further comprising,

[0012] an air inlet portion, arranged on the side wall of the drum, for introducing hot air into the drum;

[0013] an air supply and exhaust device, the air supply end of which is rotatably connected to the outer side wall of the drum and can be in communication with the air inlet portion, and the air exhaust end of which can be in communication with the air outlet, for heating the air exhausted from the drum and then supplying the heated air into the drum again to supply heat to the drum.

[0014] By adopting the above scheme, since the clothes are mainly distributed circumferentially on the side wall of the drum during the drying process, the air inlet portion is arranged on the side wall of the drum, which can increase the contact area of the hot air with the clothes and improve the drying efficiency.

[0015] Further, the air inlet portion is provided with a plurality of air inlet portions, which are distributed circumferentially along the side wall of the drum and are configured to intermittently communicate and disconnect with the air supply end of the air supply and exhaust device during the rotation of the drum.

[0016] Preferably, the air outlet is fixedly connected to the air exhaust end of the air supply and exhaust device.

[0017] By adopting the above scheme, the air is continuously exhausted outside the drum and intermittently introduced into the drum, which facilitates the formation of negative pressure in the drum, reduces the boiling point of water, facilitates the evaporation of water, and improves the drying speed.

[0018] Further, the air inlet portion comprises a first air inlet opening arranged on the side wall of the drum and configured to communicate with the air supply end of the air supply and exhaust device.

[0019] Preferably, the first air inlet opening is provided with a plurality of air inlet openings.

[0020] Further, the side wall of the drum is provided with a one-way air permeable membrane corresponding to the first air inlet opening, which is configured to allow hot air to flow from outside to inside the drum.

[0021] By adopting the above scheme, the hot air in the drum is prevented from leaking out when the air supply and exhaust device is not in communication with the air inlet portion.

[0022] Further, the inner side of the side wall of the drum is provided with a lifting rib corresponding to the position of the first air inlet opening.

[0023] The air inlet portion further comprises a second air inlet opening arranged on the lifting rib and configured to cooperate with the first air inlet opening to introduce hot air into the drum.

[0024] Preferably, the lifting rib is provided with a one-way air film corresponding to the second air inlet, configured to allow hot air to flow from the outside of the lifting rib to the inside of the drum.

[0025] Preferably, the second air inlet is provided with a plurality of.

[0026] Further, the first air inlet and / or the second air inlet are tapered in the air inlet direction.

[0027] By adopting the above scheme, the one-way flow of the gas is ensured, which can further ensure the sealing of the drum and prevent the hot air in the drum from leaking out when the air supply and exhaust device is not connected to the air inlet part.

[0028] Further, the air supply and exhaust device comprises,

[0029] The air outlet duct is in communication with the air outlet, and the inlet of the air outlet duct is configured as the exhaust end for discharging the air in the drum after heat exchange;

[0030] The air inlet duct is in communication with the air inlet part, and the outlet of the air inlet duct is configured as the air supply end for supplying the heated air into the drum;

[0031] The communication duct is in communication with the air inlet duct and the air outlet duct respectively, for heating the air discharged from the drum through the air outlet duct and then supplying the heated air into the drum through the air inlet duct, to supply heat to the drum;

[0032] The heating device is at least partially arranged in the communication duct, for heating the air discharged from the drum;

[0033] The fan is arranged in the communication duct, close to the air outlet duct, for blowing the air after heat exchange in the drum into the communication duct.

[0034] Further, the heating device comprises a heat pump assembly;

[0035] The heat pump assembly comprises,

[0036] The evaporator is arranged in the communication duct, downstream of the fan, and the refrigerant in the evaporator absorbs the heat carried by the air in the pipeline;

[0037] The condenser is arranged in the communication duct, downstream of the evaporator, close to the air inlet duct, in communication with the evaporator, and the refrigerant is condensed and releases heat in the condenser to heat the air to be supplied into the drum.

[0038] By adopting the above scheme, the heat in the air after heat exchange can be utilized to reduce energy consumption.

[0039] The second object of the present application is to provide a clothes dryer with the above-mentioned air duct system, comprising an air pressure sensor arranged on the drum for detecting the air pressure value in the drum.

[0040] The third object of the present application is to provide a control method for the above-mentioned clothes dryer, the clothes dryer comprising a fan for drawing air out of the drum, the control method comprising the steps of,

[0041] detecting a first air pressure value in the drum before starting a drying program;

[0042] detecting a second air pressure value in the drum during the execution of the drying program and comparing it with the first air pressure value;

[0043] determining to increase the rotation speed of the fan when the second air pressure value is less than the first air pressure value.

[0044] By adopting the above-mentioned scheme, the continuous circulation of air volume during the drying process can be ensured, and the air cannot be smoothly drawn out due to the excessively low air pressure in the drum can be prevented.

[0045] By adopting the above-mentioned technical scheme, the present application has the following beneficial effects compared with the prior art.

[0046] 1. Since the clothes are mainly distributed along the circumferential direction on the side wall of the drum during the drying process, the air inlet part is arranged on the side wall of the drum, which can increase the contact area of the hot air and the clothes and improve the drying efficiency.

[0047] 2. The air outlet is fixedly connected with the air outlet duct, the air is continuously drawn out during the drying process, the air inlet part is intermittently connected and disconnected with the air inlet duct, the air is intermittently drawn in, the negative pressure in the drum is formed, the boiling point of water is reduced, the water evaporation is facilitated, and the drying speed is improved.

[0048] 3. The one-way air permeable membrane on the air inlet part can ensure the one-way flow of the gas and prevent the hot air in the drum from leaking out when the air supply and exhaust device is not connected with the drum.

[0049] 4. The heat pump system is adopted for heating, the heat in the gas after heat exchange can be utilized, and the energy consumption is reduced.

[0050] 5. The air pressure sensor for detecting the air pressure value in the drum is arranged on the clothes dryer, and the rotation speed of the fan according to the pressure in the drum can ensure the continuous circulation of air volume during the drying process, and the air cannot be smoothly drawn out due to the excessively low air pressure in the drum can be prevented.

[0051] The specific embodiments of the present application will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0052] The accompanying drawings, which are part of this application, serve to provide further understanding of the present application, and the schematic embodiments of the present application and the descriptions thereof serve to explain the present application, but do not constitute undue limitations on the present application. Obviously, the drawings in the following description are only some embodiments, and other drawings can be obtained from these drawings by those of ordinary skill in the art without creative labor. In the drawings:

[0053] Figure 1 is a structural schematic diagram of a drying machine of the present application;

[0054] Figure 2 is another angle schematic diagram of the drying machine of the present application;

[0055] Figure 3 is a structural schematic diagram of a roller of the present application;

[0056] Figure 4 is Figure 3 is an enlarged view of part A in FIG.

[0057] Figure 5 is a flow chart of a control method of the drying machine of the present application.

[0058] In the drawings: 1, roller; 11, lifting rib; 2, air inlet part; 21, first air inlet; 22, second air inlet; 31, air outlet duct; 32, air inlet duct; 33, communication duct; 34, fan; 35, evaporator; 36, condenser; 37, compressor; 4, air pressure sensor; 5, driving device; 6, shell; 7, filter.

[0059] It should be noted that these drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments will be described clearly and completely below with reference to the drawings of the embodiments of the present application. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0061] In the description of the present application, it should be noted that the terms "upper", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0062] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0063] As shown in Figures 1 to 4 The air duct system of the clothes dryer of the present application comprises a drum 1; an air outlet communicating with the drum 1 for discharging the heat-exchanged air; further comprising an air inlet part 2 arranged on the side wall of the drum 1 for introducing hot air into the drum 1; an air supply and exhaust device, the air supply end of which is rotatably connected to the outer side wall of the drum 1 and can communicate with the air inlet part 2, and the air exhaust end of which can communicate with the air outlet, for heating the air exhausted from the drum 1 and then supplying it into the drum 1 again to supply heat to the drum 1.

[0064] Since the clothes are mainly distributed circumferentially on the side wall of the drum 1 during the drying process, arranging the air inlet part 2 on the side wall of the drum 1 can increase the contact area of the hot air with the clothes and improve the drying efficiency.

[0065] As shown in Figure 1 and Figure 3 The arrangement of the air inlet part 2 comprises that a plurality of air inlet parts 2 are arranged and spaced apart circumferentially along the side wall of the drum 1, and are configured to be intermittently connected and disconnected with the air supply end of the air supply and exhaust device during the rotation of the drum 1.

[0066] The air outlet is arranged on the side wall or the bottom wall of the drum 1, and the air supply end of the air supply and exhaust device is rotatably connected to the drum 1; for example, the air outlet is arranged on the side wall of the drum 1 and matches the number of the air inlet part 2, and a plurality of groups of air inlet parts 2 and air outlets are arranged, each air inlet part 2 and each air outlet are uniformly distributed circumferentially along the side wall of the drum 1, the gap distance between adjacent two air inlet parts 2 and the gap distance between adjacent two air outlets are the same, and the air exhaust end and the air supply end of the air supply and exhaust device are simultaneously disconnected or connected with the air outlet and the air inlet part 2 during the rotation of the drum 1.

[0067] Alternatively, the air outlet is fixedly connected with the air exhaust end of the air supply and exhaust device, specifically, the outer part of the drum 1 is provided with a housing 6, and the air outlet is arranged on the window cushion where the housing 6 and the discharge opening of the drum 1 meet, since the window cushion does not rotate with the drum 1, it is convenient to connect and seal with the air supply and exhaust device.

[0068] Preferably, the present application adopts the scheme that the air outlet is arranged on the window cushion.

[0069] The air inlet part 2 is arranged close to the bottom wall of the drum 1, so that the distance of air inlet and outlet on the drum 1 is far, and the clothes in the drum 1 can be fully contacted with the hot air, so that the heat carried by the hot air can be fully utilized, and the drying efficiency and heat utilization rate are improved.

[0070] Further, the filter 7 is arranged on the window pad at a position corresponding to the air outlet, for filtering the air in the drum 1 to be discharged.

[0071] The air outlet is fixedly connected with the air supply and exhaust device, and the air is continuously discharged outside the drum during the drying process. The air inlet part 2 is intermittently connected and disconnected with the air supply and exhaust device, and the air is intermittently supplied into the drum, so that the negative pressure is formed in the drum, the boiling point of water is reduced, the water evaporation is facilitated, and the drying speed is improved.

[0072] As shown in Figure 3 , the air inlet part 2 includes a first air inlet 21 arranged on the side wall of the drum 1 and used for communicating with the air supply end of the air supply and exhaust device. Preferably, the first air inlet 21 is provided with a plurality of first air inlets 21, and the plurality of first air inlets 21 of each group of air inlet parts 2 are distributed along the axial direction of the drum 1.

[0073] Further, the one-way air film is arranged on the side wall of the drum 1 at a position corresponding to the first air inlet 21, and is configured to allow the hot air to flow from outside to the drum 1. The hot air in the drum 1 is prevented from leaking out when the air supply and exhaust device is not connected with the air inlet part 2.

[0074] As shown in Figure 3 , the inner side of the side wall of the drum 1 is provided with a lifting rib 11 corresponding to the position of the first air inlet 21. The air inlet part 2 further includes a second air inlet 22 arranged on the lifting rib 11 and used for cooperating with the first air inlet 21 to introduce the hot air into the drum 1. The second air inlet 22 is provided with a plurality of second air inlets 22 distributed along the axial direction of the drum 1 on the lifting rib 11.

[0075] As an embodiment, one lifting rib 11 corresponds to all the first air inlets 21 of one air inlet part 2 covered by the cover, so that the air entering from the first air inlet 21 enters the drum 1 through the second air inlet 22 on the lifting rib 11.

[0076] The shape and size of the first air inlet 21 and the second air inlet 22 can be set according to actual needs, and the shape of the first air inlet 21 and the second air inlet 22 can be the same or different.

[0077] As an embodiment, as shown in Figure 3 and Figure 4 , the first air inlet 21 and / or the second air inlet 22 gradually narrows in the air inlet direction, and has a conical structure.

[0078] Further, a one-way air film is arranged on the lifting rib 11 corresponding to the second air inlet 22, configured to allow hot air to flow from outside the lifting rib 11 to the inside of the drum 1.

[0079] As an embodiment, a one-way air film is arranged on at least one side of the lifting rib 11.

[0080] By adopting the above scheme, the one-way flow of air is ensured, and the sealing of the drum 1 is further ensured to prevent the leakage of hot air in the drum 1 when the air supply and exhaust device is not in communication with the air inlet part 2.

[0081] As shown in Figure 1 and Figure 2 , the air supply and exhaust device comprises an air outlet duct 31 in communication with the air outlet, the inlet of the air outlet duct 31 is configured as the air exhaust end for exhausting the air in the drum 1 after heat exchange; an air inlet duct 32 in communication with the air inlet part 2, the outlet of the air inlet duct 32 is configured as the air supply end for supplying the air into the drum 1 after heating; a communication duct 33 in communication with the air inlet duct 32 and the air outlet duct 31 respectively, for circulating the air in the drum 1 to supply heat to the drum 1; a heating device arranged at least partially in the communication duct 33 for heating the air exhausted from the drum 1; and a fan 34 arranged in the communication duct 33 close to the air outlet duct 31 for blowing the air in the drum 1 after heat exchange into the communication duct 33.

[0082] The inlet of the air outlet duct 31 is in sealing connection with the air outlet, and the air inlet duct 32 is in sealing connection with the side wall of the drum 1, covering at least the air inlet part 2, configured such that when the drum 1 rotates to a position corresponding to the air inlet part 2 and the outlet of the air inlet duct 32, the outlet of the air inlet duct 32 can completely cover the air inlet part 2.

[0083] The end of the air inlet duct 32 close to the drum 1 gradually increases in diameter in the air outlet direction,

[0084] As shown in Figure 1 and Figure 2 , the air supply and exhaust device is arranged below the drum 1 and fixedly connected with the bottom wall of the shell 6.

[0085] The communication duct 33 is arranged below the drum 1 and located in the bottom wall of the shell 6, fixedly connected with the bottom wall of the shell 6, one end of the air outlet duct 31 is connected with one end of the communication duct 33, and the other end is connected with the drum 1; one end of the air inlet duct 32 is connected with the other end of the communication duct 33, and the other end is rotatably connected with the side wall of the drum 1.

[0086] As shown in Figure 1 andFigure 2 As shown in the figure, the heating device comprises a heat pump assembly; the heat pump assembly comprises an evaporator 35 arranged in the communication air duct 33 downstream of the fan 34, and the refrigerant in the evaporator 35 absorbs the heat carried by the air in the pipeline; a condenser 36 arranged in the communication air duct 33 downstream of the evaporator 35, close to the air inlet duct 32, arranged below the air inlet duct 32, and communicated with the evaporator 35, and the refrigerant in the condenser 36 is condensed and releases heat to heat the air to be introduced into the drum 1.

[0087] The heat pump assembly further comprises a compressor 37 and a throttling device, and the evaporator 35, the compressor 37, the condenser 36, the throttling device and the evaporator 35 are connected to form a refrigerant circuit. Figure 2 As shown in the figure, the compressor 37 is arranged outside the communication air duct 33.

[0088] The heat pump assembly of the present application can utilize the heat in the heat-exchanged gas to circulate and heat the air in the drum 1, thereby reducing energy consumption.

[0089] As shown in the figure, Figure 1 and Figure 2 As shown in the figure, a clothes dryer with the above-mentioned air duct system of the present application comprises an air pressure sensor arranged on the drum 1 for detecting the air pressure value in the drum 1.

[0090] As shown in the figure, Figure 1 The air pressure sensor is arranged on the bottom wall of the drum 1.

[0091] Further, the clothes dryer further comprises a driving device 5 rotationally connected to the bottom wall of the drum 1 for driving the drum 1 to rotate, and the air pressure sensor is arranged close to the driving device 5.

[0092] As shown in the figure, Figure 5 The control method of the clothes dryer of the present application comprises the following steps,

[0093] S1, detecting a first air pressure value in the drum before starting the drying program;

[0094] S2, detecting a second air pressure value in the drum during the execution of the drying program, and comparing it with the first air pressure value;

[0095] S3, determining to increase the fan speed when the second air pressure value is less than the first air pressure value.

[0096] The step S2 specifically comprises detecting the second air pressure value in the drum after starting the drying program for a set time T1.

[0097] Further, after the step S3, there is a step,

[0098] S4, after interval setting time T2, detecting the third air pressure value in the drum, comparing with the second air pressure value, judging when the third air pressure value is less than the second air pressure value, increasing the fan rotating speed;

[0099] S5, repeatedly executing step S4, taking the real-time detected air pressure value as the third air pressure value, taking the last detected air pressure value as the second air pressure value, until the drying program ends.

[0100] The T2 is same as or different from T1.

[0101] Before starting the drying program, the air pressure in the air exhaust device is equal to the air pressure in the drum 1, that is, the first air pressure value detected in the drum 1 is same as or close to the outside atmospheric pressure. During the drying process, because the air exhaust amount in the drum 1 is greater than the air intake amount, the air pressure in the drum 1 gradually decreases. By increasing the rotating speed of the fan 34, the continuous circulation of air volume during the drying process can be ensured, and the problem that the air cannot be smoothly exhausted due to the too low air pressure in the drum 1 can be prevented.

[0102] The above description is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the above-mentioned technical content without departing from the technical solution of the present application, and the equivalent embodiments with equivalent changes can be obtained. The implementation schemes in the above embodiments can be further combined or replaced. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present application, which does not depart from the technical solution of the present application, still belongs to the scope of the present application.

Claims

1. An air duct system of a clothes dryer, comprising, a drum; an air outlet in communication with the drum for discharging the heat-exchanged air; characterized in that further comprising, an air inlet arranged on a side wall of the drum for introducing hot air into the drum; an air supply and exhaust device, a supply end of which is rotatably connected to an outer side wall of the drum and in communication with the air inlet, and an exhaust end of which is in fixed connection with the air outlet for introducing the air exhausted from the drum into the drum again after being heated to supply heat to the drum cyclically; a plurality of air inlets are arranged along a circumferential direction of the drum, and the supply end of the air supply and exhaust device is intermittently connected to and disconnected from the air inlets during rotation of the drum, and the exhaust end of the air supply and exhaust device is in fixed connection with the air outlet.

2. The air duct system of a clothes dryer according to claim 1, wherein The air inlet comprises a first air inlet arranged on the side wall of the drum for being in communication with the supply end of the air supply and exhaust device.

3. The air duct system of a clothes dryer according to claim 2, wherein The first air inlet is provided with a plurality of first air inlets.

4. The air duct system of a clothes dryer according to claim 2 or 3, characterized in that, A one-way air permeable membrane is arranged on the side wall of the drum corresponding to the first air inlets, and the hot air can only flow from the outside to the inside of the drum.

5. The air duct system of a clothes dryer according to claim 2, wherein An inner side of the side wall of the drum is provided with a lifting rib corresponding to the position of the first air inlet; The air inlet further comprises a second air inlet arranged on the lifting rib for cooperating with the first air inlet to introduce hot air into the drum.

6. The air duct system of a clothes dryer according to claim 5, wherein A one-way air permeable membrane is arranged on the lifting rib corresponding to the second air inlet, and the hot air can only flow from the outside of the lifting rib to the inside of the drum.

7. The air duct system of a clothes dryer according to claim 5, wherein The second air inlet is provided with a plurality of second air inlets.

8. A duct system for a clothes dryer as claimed in any one of claims 5 to 7, wherein, The first air inlet and / or the second air inlet gradually narrows in the air inlet direction, forming a conical structure.

9. The air duct system of a clothes dryer according to claim 1, wherein The air supply and exhaust device comprises, an air outlet duct in communication with the air outlet, an inlet of the air outlet duct being configured as the exhaust end for discharging the heat-exchanged air from the drum; an air inlet duct in communication with the air inlet, an outlet of the air inlet duct being configured as the supply end for introducing the heated air into the drum; a communication duct in communication with the air inlet duct and the air outlet duct for introducing the air exhausted from the drum into the drum again after being heated to supply heat to the drum cyclically; a heating device arranged at least partially in the communication duct for heating the air exhausted from the drum; a fan arranged in the communication duct close to the air outlet duct for blowing the heat-exchanged air from the drum into the communication duct.

10. The air duct system of a clothes dryer according to claim 9, wherein The heating device comprises a heat pump assembly; The heat pump assembly comprises, an evaporator arranged in the communication duct downstream of the fan, the refrigerant in the evaporator absorbing heat carried by the air in the air duct; a condenser arranged in the communication duct downstream of the evaporator close to the air inlet duct and in communication with the evaporator, the refrigerant being condensed and releasing heat in the condenser to heat the air to be introduced into the drum.

11. A clothes dryer having the air duct system according to any one of claims 1 to 10, characterized in that comprising a gas pressure sensor arranged on the drum for detecting a gas pressure value in the drum.

12. A control method of a clothes dryer as claimed in claim 11, the clothes dryer comprising a fan for drawing air from the inside of the drum to the outside, characterized in that The control method comprises the following steps, detecting a first gas pressure value in the drum before starting the clothes drying program; detecting a second gas pressure value in the drum during execution of the clothes drying program, and comparing the second gas pressure value with the first gas pressure value; judging that the fan speed is increased when the second gas pressure value is less than the first gas pressure value.

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