Air duct system, double barrel laundry treatment apparatus, and drying method

Abstract

The present application relates to a kind of air duct system, double-barreled clothes processing equipment and drying method, air duct system includes air inlet component, air inlet component includes upper air inlet air duct and lower air inlet air duct;Air outlet component, air outlet component includes upper air outlet air duct and lower air outlet air duct;Main drying air duct, it is arranged between air inlet component and air outlet component;First air distribution component, including first air distribution shell and first air distribution piece, first air distribution shell is formed in first air distribution cavity, first air distribution shell is provided with first main air port, first upper air port, first lower air port and fresh air inlet, second air distribution component, including second air distribution shell and second air distribution piece, second air distribution shell is formed in second air distribution cavity, second air distribution shell is provided with second main air port, second upper air port and second lower air port.The present application can be introduced to the outside fresh air in clothes processing cylinder from fresh air inlet in the later period of separate drying or simultaneous drying, reduce compressor temperature, reduce compressor working condition frequency, improve drying efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of clothes processing equipment, and in particular to an air duct system, a double-cylinder clothes processing equipment and a drying method. BACKGROUND

[0002] With the improvement of living standards, people pursue safer and more comfortable clothes drying experiences. Currently, the drying method of clothes processing devices with drying functions is gradually changing from electric heating drying to heat pump drying. Currently, there are double-cylinder clothes processing devices on the market that share a set of heat pump systems. In the later stage of double-cylinder drying, the drying load of the two cylinders is large. At this time, only one set of two-device modules (evaporator and condenser) is used to cope with the drying demand of the clothes load of the two cylinders. The working condition load of the compressor will be very large. At this time, it is necessary to increase the two-device heat exchange area or replace a high-power compressor to solve the above problems. However, increasing the two-device heat exchange area and replacing a high-power compressor will result in an increase in the size of the entire machine, and the production, manufacturing and transportation costs will also increase accordingly. SUMMARY

[0003] To overcome the problem of increasing the size of the entire machine and increasing the cost by increasing the two-device heat exchange area or replacing a high-power compressor to solve the problem of large working condition load of the compressor when double cylinders are dried at the same time in the related art, the present application proposes, in a first aspect, an air duct system for a double-cylinder clothes processing equipment, the air duct system comprising:

[0004] an air inlet assembly, the air inlet assembly comprising an upper air inlet duct and a lower air inlet duct;

[0005] an air outlet assembly, the air outlet assembly comprising an upper air outlet duct and a lower air outlet duct;

[0006] a main drying air duct, disposed between the air inlet assembly and the air outlet assembly;

[0007] The first air distribution assembly comprises a first air distribution shell and a first air distribution component. The first air distribution shell forms a first air distribution cavity. The first air distribution shell is provided with a first main air outlet, a first upper air outlet, a first lower air outlet and a fresh air inlet. The first main air outlet is in communication with the first air distribution cavity and the air inlet end of the main drying air duct. The first upper air outlet is in communication with the first air distribution cavity and the air outlet end of the upper air outlet duct. The first lower air outlet is in communication with the first air distribution cavity and the air outlet end of the lower air outlet duct. The fresh air inlet is in communication with the first air distribution cavity and the external environment. The first air distribution component is arranged in the first air distribution cavity. The first air distribution component has at least a first working position in which the first upper air outlet and the first lower air outlet are simultaneously opened and the fresh air inlet is closed, a second working position in which one of the first upper air outlet and the first lower air outlet is opened and the other is closed and the fresh air inlet is closed, and a third working position in which the first upper air outlet, the first lower air outlet and the fresh air inlet are simultaneously opened. The first air distribution component can be controlled to switch between the first working position, the second working position and the third working position.

[0008] The second air distribution assembly comprises a second air distribution shell and a second air distribution component. The second air distribution shell forms a second air distribution cavity. The second air distribution shell is provided with a second main air outlet, a second upper air outlet and a second lower air outlet. The second main air outlet is in communication with the second air distribution cavity and the air outlet end of the main drying air duct. The second upper air outlet is in communication with the second air distribution cavity and the air inlet end of the upper air inlet duct. The second lower air outlet is in communication with the second air distribution cavity and the air inlet end of the lower air inlet duct. The second air distribution component is arranged in the second air distribution cavity. The second air distribution component has at least a fourth working position in which the second upper air outlet and the second lower air outlet are simultaneously opened, and a fifth working position in which one of the second upper air outlet and the second lower air outlet is opened and the other is closed. The second air distribution component can be controlled to switch between the fourth working position and the fifth working position.

[0009] In some embodiments, the first air distribution cavity comprises a first cylindrical cavity. The first upper air outlet and the first lower air outlet are arranged along a first side wall in a circumferential direction of the first cylindrical cavity. The first air distribution component is rotatably arranged on a first bottom wall in an axial direction of the first cylindrical cavity. The rotation axis of the first air distribution component is coaxial with the axis of the first cylindrical cavity. The first main air outlet is arranged opposite to the first bottom wall. The first air distribution component comprises a first abutting surface and a second abutting surface connected with each other. The first abutting surface is arranged in abutment with the first side wall. The second abutting surface is arranged in abutment with the first bottom wall. The fresh air inlet is arranged on the first bottom wall. The second abutting surface is provided with a bypass opening.

[0010] When the first air distribution component is in the first working position, the first abutting surface opens the first upper air outlet and the first lower air outlet simultaneously, and the second abutting surface closes the fresh air inlet; when the first air distribution component is in the second working position, the first abutting surface opens one of the first upper air outlet and the first lower air outlet and closes the other one, and the second abutting surface closes the fresh air inlet; when the first air distribution component is in the third working position, the first abutting surface opens the first upper air outlet and the first lower air outlet simultaneously, and the fresh air inlet coincides with the avoiding opening.

[0011] In some embodiments, the first side wall comprises a first arc segment, a second arc segment, a third arc segment and a fourth arc segment connected in sequence along the circumferential direction of the first cylindrical cavity, the first upper air outlet is arranged in the first arc segment, the first lower air outlet is arranged in the third arc segment, the arc length of the first arc segment is L1, the arc length of the second arc segment is L2, the arc length of the third arc segment is L3, the arc length of the fourth arc segment is L4, the arc length of the second abutting surface is L0, and the following conditions are met:

[0012] L4>L2, L0>L1, L0>L2, L0>L3, and L0≤L4, L0

[0013] In some embodiments, when the first air distribution component is in the third working position, the fresh air inlet has an air inlet area greater than the sum of air inlet areas of the first upper air outlet and the first lower air outlet.

[0014] In some embodiments, the first air distribution component further has a sixth working position in which one of the first upper air outlet and the first lower air outlet is opened and the other one is closed, and the fresh air inlet is opened, and the first air distribution component can be controlled to switch between the first working position, the second working position, the third working position and the sixth working position.

[0015] In some embodiments, the second abutting surface comprises a first abutting part and a second abutting part arranged along the radial direction of the first cylindrical cavity, and the rotation axis of the first air distribution component is located between the first abutting part and the second abutting part, the first abutting surface is connected to the first abutting part, the avoiding opening is arranged in the second abutting part, and the abutting area of the first abutting part and the first bottom wall is greater than the abutting area of the second abutting part and the first bottom wall.

[0016] When the first air distribution component is in the sixth working position, the first abutting surface opens one of the first upper air outlet and the first lower air outlet and closes the other one, and the second abutting surface completely opens or partially opens the fresh air inlet.

[0017] In some embodiments, the second air distribution cavity comprises a second cylindrical cavity, the second upper air outlet and the second lower air outlet are arranged along a second side wall of the second cylindrical cavity in a circumferential direction, the second air distribution member is arranged on a second bottom wall of the second cylindrical cavity in an axial direction, an axis of rotation of the second air distribution member is coaxial with an axis of the second cylindrical cavity, the second main air outlet is arranged opposite to the second bottom wall, and the second air distribution member comprises a third abutting surface connected therewith, the third abutting surface being arranged in abutment with the second side wall.

[0018] When the second air distribution member is in the fourth working position, the third abutting surface simultaneously opens the second upper air outlet and the second lower air outlet; and when the second air distribution member is in the fifth working position, the third abutting surface opens one of the second upper air outlet and the second lower air outlet and closes the other.

[0019] In some embodiments, the first air distribution assembly further comprises a first driving component connected with the first air distribution member, the first driving component driving the first air distribution member to switch between the first working position, the second working position and the third working position.

[0020] The second air distribution assembly further comprises a second driving component connected with the second air distribution member, the second driving component driving the second air distribution member to switch between the fourth working position and the fifth working position.

[0021] The second aspect of the present application provides a double-cylinder clothes treatment apparatus, which comprises:

[0022] a first clothes treatment cylinder and a second clothes treatment cylinder arranged in sequence from top to bottom;

[0023] a heat exchange assembly and an air fan assembly;

[0024] Any air duct system according to the first aspect of the present application, the main drying air duct is arranged between the first clothes treatment cylinder and the second clothes treatment cylinder, the heat exchange assembly and the air fan assembly are arranged in the main drying air duct, the air outlet end of the upper air inlet duct is in communication with the upper air inlet of the first clothes treatment cylinder, the air outlet end of the lower air inlet duct is in communication with the lower air inlet of the second clothes treatment cylinder, the air inlet end of the upper air outlet duct is in communication with the upper air outlet of the first clothes treatment cylinder, and the air inlet end of the lower air outlet duct is in communication with the lower air outlet of the second clothes treatment cylinder.

[0025] The drying process of the laundry treatment device in the double-cylinder drying mode includes an internal circulation drying process and a fresh air introduction drying process; in the internal circulation drying process, the first air distribution member is in the first working position, and the second air distribution member is in the fourth working position; in the fresh air introduction drying process, the first air distribution member is in the third working position, and the second air distribution member is in the fourth working position.

[0026] The third aspect of the present application provides a drying method of a double-cylinder laundry treatment device, which is used for controlling the double-cylinder laundry treatment device provided in the second aspect of the present application, and the drying method includes:

[0027] When the double-cylinder laundry treatment device is in the double-cylinder drying mode, the first air distribution member is controlled to be in the first working position, and the second air distribution member is controlled to be in the fourth working position;

[0028] The exhaust temperature of the compressor of the double-cylinder laundry treatment device is obtained, and when the exhaust temperature is greater than a first set temperature, the first air distribution member is controlled to be in the third working position;

[0029] The exhaust temperature is obtained again, and when the exhaust temperature is less than a second set temperature, the first air distribution member is restored to the first working position.

[0030] The technical solution of the present application can include the following beneficial effects: the present application sets a fresh air inlet on the first air distribution assembly located between the main drying air duct and the air outlet assembly, and guides external fresh air into the laundry treatment cylinder through the fresh air inlet in the later stage of single-cylinder drying or simultaneous drying of the double-cylinder laundry treatment device, thereby reducing the temperature and working frequency of the compressor, avoiding continuous high-frequency work of the compressor, and prolonging the service life of the compressor. And the structure of the air duct system of the present application is simple and reliable, and the switching of the positions of the air distribution members realizes the switching of the internal circulation drying process and the fresh air introduction drying process in the single-cylinder drying or double-cylinder drying process, thereby prolonging the service life of the compressor at a lower cost and smaller structural limitation.

[0031] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings, which are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application.

[0033] Figure 1 is a partial structure diagram of an air duct system according to an exemplary embodiment.

[0034] Figure 2is a cross-sectional view of a first air dividing assembly according to an exemplary embodiment.

[0035] Figure 3 is a cross-sectional view of a second air dividing assembly according to an exemplary embodiment.

[0036] Figure 4 is a view of a second air dividing assembly according to another exemplary embodiment.

[0037] Figure 5 is a view of a dual drum laundry treating apparatus according to an exemplary embodiment.

[0038] Figure 6 is a view of an airflow flow path of an internal circulation drying process of a dual drum laundry treating apparatus in a dual drum drying mode according to an exemplary embodiment.

[0039] Figure 7 is a view of an airflow flow path of a fresh air induction drying process of a dual drum laundry treating apparatus in a dual drum drying mode according to an exemplary embodiment.

[0040] Figures 8a-8b is a view of a position state of a first air dividing member and a second air dividing member during an internal circulation drying process in a dual drum drying mode according to an exemplary embodiment.

[0041] Figures 9a-9b is a view of a position state of a first air dividing member and a second air dividing member during a fresh air induction drying process in a dual drum drying mode according to an exemplary embodiment.

[0042] Figures 10a-10b is a view of a position state of a first air dividing member and a second air dividing member during an internal circulation drying process in a single drum drying mode according to an exemplary embodiment.

[0043] Figures 11a-11b is a view of a position state of a first air dividing member and a second air dividing member during a fresh air induction drying process in a single drum drying mode according to an exemplary embodiment.

[0044] Figure 12 is a drying flow diagram of a dual drum laundry treating apparatus according to an exemplary embodiment.

[0045] Reference numerals are as follows:

[0046] 1, first laundry treatment drum; 2, second laundry treatment drum; 3, heat exchange assembly; 4, fan assembly; 51, main drying air duct; 52, upper air inlet duct; 53, lower air inlet duct; 54, upper air outlet duct; 55, lower air outlet duct; 6, first air distribution assembly; 61, first air distribution shell; 611, first arc segment; 612, second arc segment; 613, third arc segment; 614, fourth arc segment; 615, first bottom wall; 62, first air distribution member; 621, first abutting surface; 622, second abutting surface; 6221, first abutting portion; 6222, second abutting portion; 6101, first upper branch air outlet; 6102, first lower branch air outlet; 6103, fresh air inlet; 6104, avoidance opening; 63, first rotating shaft; 7, second air distribution assembly; 71, second air distribution shell; 711, second bottom wall; 72, second air distribution member; 721, third abutting surface; 722, fourth abutting surface; 7101, second upper branch air outlet; 7102, second lower branch air outlet; 73, second rotating shaft; 74, connecting arm. DETAILED DESCRIPTION

[0047] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, unless otherwise indicated, like numbers refer to like elements throughout the several drawings. The following detailed description includes specific details for the purpose of providing an understanding of the various exemplary embodiments. However, it will be apparent to those skilled in the art that the exemplary embodiments can be practiced without these specific details. In some instances, well-known structures and components are not described in detail in order to avoid obscuring the understanding of the various exemplary embodiments.

[0048] According to an exemplary embodiment, as shown in Figure 1 The present embodiment proposes a kind of air duct system for double-cylinder laundry treatment equipment, air duct system includes air inlet assembly, air outlet assembly and main drying air duct 51, wherein, air inlet assembly includes upper air inlet duct 52 and lower air inlet duct 53, air outlet assembly includes upper air outlet duct 54 and lower air outlet duct 55, main drying air duct 51 is arranged between air inlet assembly and air outlet assembly, main drying air duct 51 connects the airflow passage between upper air inlet assembly and air outlet assembly.The upper air inlet duct 52 is used to be connected with the upper air inlet of the first laundry treatment drum 1 located above the double-cylinder laundry treatment equipment, the lower air inlet duct 53 is used to be connected with the lower air inlet of the second laundry treatment drum 2 located below the double-cylinder laundry treatment equipment, the upper air outlet duct 54 is used to be connected with the upper air outlet of the first laundry treatment drum 1, and the lower air outlet duct 55 is used to be connected with the lower air outlet of the second laundry treatment drum 2.

[0049] The air duct system further comprises a first air distribution assembly 6 and a second air distribution assembly 7. The first air distribution assembly 6 comprises a first air distribution shell 61 and a first air distribution member 62. The first air distribution shell 61 defines a first air distribution cavity therein. The first air distribution shell 61 is provided with a first main air inlet, a first upper air outlet 6101, a first lower air outlet 6102, and a fresh air inlet 6103. The first main air inlet is in communication with the first air distribution cavity and the air inlet end of the main drying air duct 51. The first upper air outlet 6101 is in communication with the air outlet end of the upper air outlet duct 54 and the first air distribution cavity. The first lower air outlet 6102 is in communication with the air outlet end of the lower air outlet duct 55 and the first air distribution cavity. The fresh air inlet 6103 is in communication with the first air distribution cavity and the external environment. The first air distribution member 62 is arranged in the first air distribution cavity. The first air distribution member 62 has at least a first working position in which the first upper air outlet 6101 and the first lower air outlet 6102 are both opened and the fresh air inlet 6103 is closed, a second working position in which one of the first upper air outlet 6101 and the first lower air outlet 6102 is opened and the other is closed and the fresh air inlet 6103 is closed, and a third working position in which the first upper air outlet 6101, the first lower air outlet 6102, and the fresh air inlet 6103 are all opened. The first air distribution member 62 can be controlled to switch between the first working position, the second working position, and the third working position. The second air distribution assembly 7 comprises a second air distribution shell 71 and a second air distribution member 72. The second air distribution shell 71 defines a second air distribution cavity therein. The second air distribution shell 71 is provided with a second main air outlet, a second upper air inlet 7101, and a second lower air inlet 7102. The second main air outlet is in communication with the second air distribution cavity and the air outlet end of the main drying air duct 51. The second upper air inlet 7101 is in communication with the air inlet end of the upper air inlet duct 52 and the second air distribution cavity. The second lower air inlet 7102 is in communication with the air inlet end of the lower air inlet duct 53 and the second air distribution cavity. The second air distribution member 72 is arranged in the second air distribution cavity. The second air distribution member 72 has at least a fourth working position in which the second upper air inlet 7101 and the second lower air inlet 7102 are both opened, and a fifth working position in which one of the second upper air inlet 7101 and the second lower air inlet 7102 is opened and the other is closed. The second air distribution member 72 can be controlled to switch between the fourth working position and the fifth working position.

[0050] When the first air distribution member 62 is in the first working position and the second air distribution member 72 is in the fourth working position, the double-cylinder simultaneous drying function of the double-cylinder clothes treatment device can be realized. When the first air distribution member 62 is in the third working position and the second air distribution member 72 is in the fourth working position, the double-cylinder fresh air drying function of the double-cylinder simultaneous drying process of the double-cylinder clothes treatment device can be realized. At this time, the purpose of opening the first upper air outlet 6101 and the first lower air outlet 6102 is to maintain the air pressure balance in the entire machine. When the first air distribution member 62 is in the second working position and the second air distribution member 72 is in the fifth working position, the internal circulation drying function of the single-cylinder drying process of the double-cylinder clothes treatment device can be realized.

[0051] In a preferred embodiment, when the first air distributing member 62 is in the third working position, the air inlet area of the fresh air inlet 6103 is greater than the sum of the air inlet areas of the first upper air outlet 6101 and the first lower air outlet 6102, so as to achieve the optimal effect of introducing the external fresh air.

[0052] In some embodiments, as shown in Figure 2 The first air distributing cavity includes a first cylindrical cavity, the first upper air outlet 6101 and the first lower air outlet 6102 are arranged along the first side wall of the first cylindrical cavity in the circumferential direction, the first air distributing member 62 is arranged on the first bottom wall 615 of the first cylindrical cavity in the axial direction, the rotation axis of the first air distributing member 62 is coaxial with the axis of the first cylindrical cavity, and the first main air outlet is arranged opposite to the first bottom wall 615. The first air distributing member 62 includes a first abutting surface 621 and a second abutting surface 622 connected with each other, the first abutting surface 621 is arranged in abutment with the first side wall, the second abutting surface 622 is arranged in abutment with the first bottom wall 615, the fresh air inlet 6103 is arranged on the first bottom wall 615, and the second abutting surface 622 is provided with the avoiding opening 6104. The second abutting surface 622 is rotatably arranged on the first bottom wall 615, the avoiding opening 6104 arranged on the second abutting surface 622 is used to coincide with the fresh air inlet 6103 when the second abutting surface 622 is rotated to a specific position, at this time, the fresh air inlet 6103 communicates the first air distributing cavity with the external environment, and the fresh air of the external environment can enter the main drying air duct 51 through the first air distributing cavity. In addition, when the second abutting surface 622 is rotated to other positions, the second abutting surface 622 can block the fresh air inlet 6103 to seal the fresh air inlet 6103, so as to prevent the external fresh air from entering the main drying air duct 51.

[0053] The first fitting surface 621 of the embodiment is rotatably arranged on the sidewall of the first air distribution cavity, the first fitting surface 621 is arc-shaped, and the second fitting surface 622 is planar. When the first air distribution member 62 is in different working positions, the first fitting surface 621 and the second fitting surface 622 will be rotated to the corresponding positions. For example, when the first air distribution member 62 is in the first working position, the first fitting surface 621 is located in the transition area between the first upper air outlet 6101 and the first lower air outlet 6102 to completely open the first upper air outlet 6101 and the first lower air outlet 6102, and the second fitting surface 622 closes the fresh air inlet 6103. For example, the first fitting surface 621 is located opposite to the wall surface between the first upper air outlet 6101 and the first lower air outlet 6102, and at this time, the second fitting surface 622 is located in a position capable of completely blocking the fresh air inlet 6103. When the first air distribution member 62 is in the second working position, the first fitting surface 621 is located in a position capable of completely opening one of the first upper air outlet 6101 and the first lower air outlet 6102 and completely blocking the other one, and the second fitting surface 622 is located in a position capable of completely blocking the fresh air inlet 6103. When the first air distribution member 62 is in the third working position, the first fitting surface 621 is located in a position capable of completely opening or partially opening the first upper air outlet 6101 and the first lower air outlet 6102, and at this time, the second fitting surface 622 is located in a position capable of completely or partially coinciding the avoidance opening 6104 with the fresh air inlet 6103.

[0054] In one implementable manner, continuing to refer to Figure 2The first bottom wall 615 comprises a first semicircular portion and a second semicircular portion. The first upper air outlet 6101 and the first lower air outlet 6102 are located at positions corresponding to the first semicircular portion, and the fresh air inlet 6103 is arranged at the second semicircular portion. For example, the fresh air inlet 6103 is arranged on the center line of the wall surface between the first upper air outlet 6101 and the first lower air outlet 6102. The second abutting surface 622 comprises a first abutting portion 6221 and a second abutting portion 6222. The first abutting surface 621 is connected to the first abutting portion 6221, and the first abutting portion 6221 and the second abutting portion 6222 are arranged along the radial direction of the first cylindrical cavity. The avoiding opening 6104 is arranged at the second abutting portion 6222. When the first air distribution component 62 is in the first working position, the first abutting portion 6221 is rotated to the second semicircular portion, the second abutting portion 6222 is rotated to the first semicircular portion, the first abutting surface 621 opens the first upper air outlet 6101 and the first lower air outlet 6102, and the first abutting portion 6221 blocks the fresh air inlet 6103. The first abutting portion 6221 and the second abutting portion 6222 can have the same size and structure, or can have different sizes and structures. In a preferred embodiment, the area of the second abutting portion 6222 abutting the first bottom wall 615 is smaller than the abutting area of the first abutting portion 6221 and the first bottom wall 615, so as to reduce the resistance in the rotation process of the first abutting surface 621. When the first air distribution component 62 is in the third working position, the first abutting portion 6221 is rotated to the first semicircular portion, the second abutting portion 6222 is rotated to the second semicircular portion, the first abutting surface 621 partially opens or fully opens the first upper air outlet 6101 and the first lower air outlet 6102, and the avoiding opening 6104 coincides with the fresh air inlet 6103.

[0055] In some embodiments, continuing to refer to Figure 2, the first side wall comprises a first arc segment 611, a second arc segment 612, a third arc segment 613 and a fourth arc segment 614 connected in sequence along a circumferential direction of the first cylindrical cavity, the first upper air inlet 6101 is arranged on the first arc segment 611, the first lower air inlet 6102 is arranged on the third arc segment 613, an arc length of the first arc segment 611 is L1, an arc length of the second arc segment 612 is L2, an arc length of the third arc segment 613 is L3, an arc length of the fourth arc segment 614 is L4, an arc length of the second abutting surface 622 is L0, and the following conditions are met: L4>L2, L0>L1, L0>L3, L0≤L4, and L0<L1+L2+L3. In the case that each arc segment meets the above conditions, when the first abutting surface 621 is located at a position corresponding to L4, the first abutting surface 621 opens the first upper air inlet 6101 and the first lower air inlet 6102, when the first abutting surface 621 is located at a position corresponding to L2, the first abutting surface 621 opens the first upper air inlet 6101, the first air inlet and the fresh air inlet 6103 at the same time, and when the first abutting surface 621 is located at a position corresponding to L1 or L3, the first abutting surface 621 separately blocks the first upper air inlet 6101 and the second upper air inlet 7101. In a preferred embodiment, L0 also meets the condition: L0>L2, so as to achieve partial blocking of the first upper air inlet 6101 and the first lower air inlet 6102.

[0056] In some embodiments, the first air distribution member 62 also has a sixth working position in which one of the first upper air inlet 6101 and the first lower air inlet 6102 is opened and the other is closed, and the fresh air inlet 6103 is opened, and the second air distribution member 72 can be controlled to switch between the first working position, the second working position, the third working position and the sixth working position. The present embodiment can realize the single-cylinder fresh air drying function of the double-cylinder clothes treatment device in the single-cylinder drying process when the first air distribution member 62 is in the sixth working position.

[0057] In an example, the second abutting surface 622 comprises a first abutting portion 6221 and a second abutting portion 6222, the first abutting portion 6221 and the second abutting portion 6222 are arranged along the radial direction of the first cylindrical cavity, and the rotation axis of the first air distribution member 62 is located between the first abutting portion 6221 and the second abutting portion 6222, the first abutting surface 621 is connected with the first abutting portion 6221, and the bypass opening 6104 is arranged at the second abutting portion 6222, the abutting area of the first abutting portion 6221 and the first bottom wall 615 is greater than the abutting area of the second abutting portion 6222 and the first bottom wall 615, when the first air distribution member 62 is in the sixth working position, the first abutting surface 621 completely or partially opens one of the first upper air outlet 6101 and the first lower air outlet 6102 and closes the other one, and the second abutting surface 622 completely or partially opens the fresh air inlet 6103. The first abutting portion 6221 and the second abutting portion 6222 can be reasonably designed in structure and size to achieve the partial opening or complete opening of the fresh air inlet 6103 when the first air distribution member 62 is in the sixth working position.

[0058] In other realizable ways, when the compressor can cope with the working pressure of the single-cylinder drying later stage, it is not necessary to introduce fresh air into the single cylinder to reduce the working pressure of the compressor during single-cylinder drying, at this time, the first air distribution member 62 can not have the sixth working position.

[0059] The structure of the second air distribution assembly 7 is not specifically limited in the embodiment. In an example, as shown in Figure 3 the second air distribution cavity comprises a second cylindrical cavity, the second upper air outlet 7101 and the second lower air outlet 7102 are arranged along the second side wall of the second cylindrical cavity in the circumferential direction, the second air distribution member 72 is arranged on the second bottom wall 711 in the axial direction of the second cylindrical cavity and can rotate, the rotation axis of the second air distribution member 72 is coaxial with the axis of the second cylindrical cavity, the second main air outlet is arranged opposite to the second bottom wall 711, and the second air distribution member 72 comprises a third abutting surface 721 which is arranged in abutment with the second side wall. When the second air distribution member 72 is in the fourth working position, the third abutting surface 721 opens the second upper air outlet 7101 and the second lower air outlet 7102 at the same time, at this time, the third abutting surface 721 is at a position for opening the second upper air outlet 7101 and the second lower air outlet 7102 at the same time. When the second air distribution member 72 is in the fifth working position, the third abutting surface 721 opens one of the second upper air outlet 7101 and the second lower air outlet 7102 and closes the other one, at this time, the third abutting surface 721 is at a position for opening one of the second upper air outlet 7101 and the second lower air outlet 7102 and closing the other one.

[0060] In an example, as shown in Figure 3As shown, the second air distribution assembly 7 also includes a fourth mating surface 722, which is connected to the third mating surface 721 and is mated to the second bottom wall 711. In this case, the second air distribution assembly 7 has a structure similar to the first air distribution assembly 6, except that the first bottom wall 615 of the first air distribution component 62 has a fresh air inlet 6103. Alternatively, the second air distribution assembly 7 can be designed with the exact same structure as the first air distribution assembly 6 to improve versatility. Other possible implementations include... Figure 4 As shown, the second air distribution assembly 7 also includes a connecting arm 74. The connecting arm 74 is connected to the first contact surface 621 and is disposed on the second bottom wall 711. The third contact surface 721 is rotated by driving the connecting arm 74 to rotate.

[0061] In some implementations, such as Figure 2 As shown, the first air distribution assembly 6 also includes a first driving component, which is connected to the first air distribution member 62. The first driving component drives the first air distribution member 62 to switch between a first working position, a second working position, and a third working position. A first rotating shaft 63 is provided on the first bottom wall 615 of the first air distribution chamber. The first air distribution member 62 is connected to the first rotating shaft 63. For example, the first rotating shaft 63 is located on the rotation axis of the first air distribution member 62. The first driving component is connected to the first rotating shaft 63, and the first driving component drives the first rotating shaft 63 to rotate, thereby driving the first air distribution member 62 to rotate. Figure 3 and Figure 4 As shown, the second air distribution assembly 7 also includes a second drive component connected to the second air distribution member 72. The second drive component drives the second air distribution member 72 to switch between a fourth working position and a fifth working position. A second rotating shaft 73 is provided on the second bottom wall 711 of the second air distribution chamber. The second air distribution member 72 is connected to the second rotating shaft 73. For example, the second rotating shaft 73 is located on the rotation axis of the second air distribution member 72. The second drive component is connected to the second rotating shaft 73, and the first drive component drives the second rotating shaft 73 to rotate, thereby driving the second air distribution member 72 to rotate. The first drive component and the second drive component are, for example, a combination of a drive motor and a transmission component.

[0062] The embodiment introduces external fresh air flow from the fresh air inlet 6103 in the late stage of single-cylinder or simultaneous drying of the double-cylinder clothes treatment equipment, cooperates with the position limitation of the first air distribution member 62 of the first air distribution assembly 6, and realizes the introduction of external fresh air flow from the fresh air inlet 6103, which greatly reduces the working condition pressure of the heat exchange assembly 3 and the compressor of the double-cylinder clothes treatment equipment, avoids the continuous high-frequency work of the compressor, prolongs the service life of the compressor. Moreover, the air duct system of the embodiment is simple and reliable in structure, realizes the switching of the internal circulation drying process and the fresh air drying process in the single-cylinder drying or double-cylinder drying process through the switching of the position of the air distribution member, and significantly improves the drying efficiency at a lower cost and smaller structural limitation.

[0063] It should be noted that the Nth working position (N is an integer from 1 to 6) in the embodiment is only used to distinguish different positions, for example, the first air distribution member 62 includes a first working position, a second working position, a third working position and a sixth working position, and does not mean that the first air distribution member 62 also has a fourth working position and a fifth working position. The second air distribution member 72 includes a fourth working position and a fifth working position, and does not mean that the second air distribution member 72 also has a first to third working position.

[0064] According to an exemplary embodiment, as Figure 5As shown, this embodiment proposes a dual-tube clothing processing device, which includes: a first clothing processing tube 1, a second clothing processing tube 2, a heat exchange assembly 3, and a fan assembly 4. The first clothing processing tube 1 and the second clothing processing tube 2 are arranged sequentially from top to bottom. Both the first clothing processing tube 1 and the second clothing processing tube 2 have drying functions and can be controlled to dry individually or simultaneously. The heat exchange assembly 3 includes an evaporator and a condenser. The dual-tube clothing processing device also includes a compressor and a throttling device. The compressor, condenser, throttling device, and evaporator are sequentially connected to form a refrigerant circulation loop. In a preferred embodiment, the evaporator and condenser are integrated into a single unit to form a two-unit structure. The dual-tube clothing processing device of this embodiment also includes any of the air duct systems proposed in the above embodiments. The main drying air duct 51 is disposed between the first clothing processing tube 1 and the second clothing processing tube 2, and the heat exchange assembly 3 and the fan assembly 4 are both disposed within the main drying air duct 51. For example, the fan assembly 4 is located on the air inlet side of the heat exchange assembly 3. The air outlet of the upper air inlet duct 52 is connected to the upper air inlet of the first garment processing drum 1, the air outlet of the lower air inlet duct 53 is connected to the lower air inlet of the second garment processing drum 1, the air inlet of the upper air outlet duct 54 is connected to the upper air outlet of the first garment processing drum 1, and the air inlet of the lower air outlet duct 55 is connected to the lower air outlet of the second garment processing drum 2. When the dual-drum garment processing equipment is in dual-drum drying or single-drum drying mode, the compressor and fan assembly 4 are started, the refrigerant circulates between the compressor, condenser, throttling device and evaporator, and the airflow circulates between the duct system and the dual drums, or the airflow circulates between the duct system and the single drum.

[0065] In this embodiment, the dual-drum garment processing equipment switches between an internal circulation drying process and a fresh air drying process in either a single-drum drying mode or a dual-drum drying mode. The drying process in the dual-drum drying mode includes an internal circulation drying process and a fresh air drying process. During the internal circulation drying process, the first air distributor 62 is in the first working position, and the second air distributor 72 is in the fourth working position. During the fresh air drying process, the first air distributor 62 is in the third working position, and the second air distributor 72 is in the fourth working position.

[0066] The following combination Figure 6-Figure 1 1. The internal circulation drying process and the fresh air induced drying process in single-drum or double-drum drying modes are described in detail, among which... Figure 6-Figure 1 The black arrow in 1 indicates the direction of airflow.

[0067] When the dual-drum garment processing equipment is in dual-drum drying mode, the first air distributor 62 of the first air distribution assembly 6 is in the first working position, and the second air distributor 72 of the second air distribution assembly 7 is in the fourth working position, so that both the first garment processing drum 1 and the second garment processing drum 2 are in the internal circulation drying process. The position of the first air distributor 62 is as follows: Figure 8bThe position state of the second air distribution member 72 is shown in FIG. 7B. Figure 8a At this time, the first upper air outlet 6101, the first lower air outlet 6102, the second upper air outlet 7101, and the second lower air outlet 7102 are in the open state, and the fresh air inlet 6103 is in the closed state. The air flow in the first clothes treatment drum 1 and the second clothes treatment drum 2 can circulate in the air duct system, realizing double-drum simultaneous drying. The air flow direction is shown in FIG. 6B. Figure 6 In addition, in the later stage of double-drum drying, simultaneous drying of the two drums will cause great working condition pressure on the heat exchange assembly 3 with limited heat exchange area and the compressor. In order to reduce the working condition pressure of the compressor and the heat exchange assembly 3, avoid continuous high-frequency work of the compressor, and prolong the service life of the compressor, the first air distribution member 62 can be in the third working position, and the second air distribution member 72 can be maintained in the fourth working position, so that the first clothes treatment drum 1 and the second clothes treatment drum 2 are both in the new air drying process. The position of the first air distribution member 62 is shown in FIG. 7C. Figure 9b The position state of the second air distribution member 72 is shown in FIG. 7B. Figure 9a At this time, the first upper air outlet 6101, the first lower air outlet 6102, the second upper air outlet 7101, and the second lower air outlet 7102 are in the open state, and the fresh air inlet 6103 is in the closed state. The air flow in the first clothes treatment drum 1 and the second clothes treatment drum 2 can circulate in the air duct system, realizing double-drum simultaneous drying. The air flow direction is shown in FIG. 6B. Figure 7 In the new air drying process, the fresh air inlet 6103 can be in a fully open state or a partially open state, and the first upper air outlet 6101 and the first lower air outlet 6102 can also be in a fully open state or a partially open state. In a preferred embodiment, in order to achieve the optimal effect of introducing external fresh air, the air inlet area of the fresh air inlet 6103 is greater than the sum of the air inlet areas of the first upper air outlet 6101 and the first lower air outlet 6102. The purpose of opening the first upper air outlet 6101 and the first lower air outlet 6102 is to maintain the air pressure balance inside the machine.

[0068] When the double-drum clothes treatment equipment is in the single-drum drying mode, taking only the second clothes treatment drum 2 drying as an example, the first air distribution member 62 is in the second working position for the second clothes treatment drum 2 drying, and the second air distribution member 72 is in the fifth working position for the second clothes treatment drum 2 drying, so that the second clothes treatment drum 2 is in the internal circulation drying process. The position of the first air distribution member 62 is shown in FIG. 7D. Figure 10b The position state of the second air distribution member 72 is shown in FIG. 7B. Figure 10ashown. At this time, the first lower air branch port 6102 and the second lower air branch port 7102 are in the open state, the first upper air branch port 6101, the second upper air branch port 7101 and the fresh air inlet 6103 are all in the closed state, and only the air flow in the second laundry treatment drum 2 can circulate in the air duct system, realizing the separate drying of the second laundry treatment drum 2. In addition, in the later stage of drying of the second laundry treatment drum 2, in order to reduce the working pressure of the compressor, avoid continuous high-frequency work of the compressor, and prolong the service life of the compressor, the first air distribution piece 62 can be placed in the sixth working position for drying of the second laundry treatment drum 2, and the second air distribution piece 72 can be maintained in the fifth working position for drying of the second laundry treatment drum 2, so that the second laundry treatment drum 2 is in the new air induction drying process. The position of the first air distribution piece 62 is as shown in Figure 11b The position of the second air distribution piece 72 is as shown in Figure 11a shown. At this time, the first lower air branch port 6102 and the second lower air branch port 7102 are in the open state, the first upper air branch port 6101, the second upper air branch port 7101 and the fresh air inlet 6103 are all in the closed state, and only the air flow in the second laundry treatment drum 2 can circulate in the air duct system, realizing the separate drying of the second laundry treatment drum 2. In addition, in the later stage of drying of the second laundry treatment drum 2, in order to reduce the working pressure of the compressor, avoid continuous high-frequency work of the compressor, and prolong the service life of the compressor, the first air distribution piece 62 can be placed in the sixth working position for drying of the second laundry treatment drum 2, and the second air distribution piece 72 can be maintained in the fifth working position for drying of the second laundry treatment drum 2, so that the second laundry treatment drum 2 is in the new air induction drying process. The position of the first air distribution piece 62 is as shown in

[0069] Similarly, only when the first laundry treatment drum 1 is drying, the first air distribution piece 62 needs to be placed in the second working position for drying of the first laundry treatment drum 1, and the second air distribution piece 72 needs to be placed in the fifth working position for drying of the first laundry treatment drum 1, so that the first laundry treatment drum 1 is in the internal circulation drying process. At this time, the first upper air branch port 6101 and the second upper air branch port 7101 are in the open state, and the first lower air branch port 6102, the second lower air branch port 7102 and the fresh air inlet 6103 are all in the closed state. And in the later stage of drying of the first laundry treatment drum 1, by placing the first air distribution piece 62 in the sixth working position for drying of the first laundry treatment drum 1, and maintaining the second air distribution piece 72 in the fifth working position for drying of the first laundry treatment drum 1, so that the first laundry treatment drum 1 is in the new air induction drying process, at this time, the first upper air branch port 6101, the second upper air branch port 7101 and the fresh air inlet 6103 are in the open state, and the first lower air branch port 6102 and the second lower air branch port 7102 are in the closed state. The control of only the first laundry treatment drum 1 drying and only the second laundry treatment drum 2 drying is similar, which will not be described in detail here.

[0070] According to an example embodiment, the present embodiment proposes a drying method of a double-barrel clothes treatment apparatus, the drying method being used to control the double-barrel clothes treatment apparatus proposed in the above embodiment, Figure 12 is a drying flow chart of a double-barrel clothes treatment apparatus according to an example embodiment, with reference to Figure 12 , the drying method comprises the following steps:

[0071] S1201, in the case that the double-barrel clothes treatment apparatus is in a double-barrel drying mode, controlling the first air distribution member 62 to be in a first working position and controlling the second air distribution member 72 to be in a fourth working position.

[0072] In the present embodiment, when the double-barrel clothes treatment apparatus is running in the double-barrel drying mode, the first air distribution member 62 is first controlled to be in the first working position and the second air distribution member 72 is controlled to be in the fourth working position, the position of the first air distribution member 62 is as shown in Figure 8b , and the position state of the second air distribution member 72 is as shown in Figure 8a At this time, the first air distribution member 62 is in a position in which the first upper air outlet 6101 and the first lower air outlet 6102 are all opened, the second air distribution member 72 is in a position in which the second upper air outlet 7101 and the second lower air outlet 7102 are all opened, and the first clothes treatment drum 1 and the second clothes treatment drum 2 are in a double-barrel internal circulation drying process. At this time, the drying air flow direction is: the first clothes treatment drum 1 (the second clothes treatment drum 2) - the first air distribution assembly 6 - the fan assembly 4 - the heat exchange assembly 3 - the second air distribution assembly 7 - the first clothes treatment drum 1 (the second clothes treatment drum 2), and the air flow direction is as shown in Figure 6 .

[0073] S1202, obtaining the exhaust temperature of the double-barrel clothes treatment apparatus, and in the case that the exhaust temperature is greater than a first set temperature, controlling the first air distribution member 62 to be in a third working position.

[0074] In the present embodiment, during the double-barrel simultaneous drying process, the working pressure of the compressor and the heat exchange assembly 3 is relatively large, and the compressor will be in a long-time high-frequency operation state. In order to reduce the working load of the compressor and the heat exchange assembly 3, it is necessary to introduce external fresh air into the air duct to reduce the drying operation temperature of the whole machine, so as to reduce the working temperature of the compressor and the frequency of the compressor, avoid continuous high-frequency work of the compressor, prolong the service life of the compressor. The exhaust temperature of the compressor can be monitored, and in the case that the exhaust temperature of the compressor is greater than a first set temperature, it can be judged that the compressor is in a high-frequency working condition. The first set temperature is an empirical temperature difference value for determining that the compressor is in a high-frequency working condition, and the size thereof can be obtained according to test verification.

[0075] When the compressor discharge temperature is greater than the first set temperature, it indicates that the compressor is in a high-frequency operating condition, and the operating load pressure of the compressor and the heat exchange assembly 3 is relatively large, so that fresh air needs to be introduced from the outside. By switching the first air distribution component 62 to the third working position and maintaining the second air distribution component 72 at the fourth working position, the position of the first air distribution component 62 is as shown in Figure 9b , and the position state of the second air distribution component 72 is as shown in Figure 9a . At this time, the first air distribution component 62 is in a position in which the first upper air outlet 6101, the first lower air outlet 6102, and the fresh air inlet 6103 are opened. At the same time, the second air distribution component 72 is in a position in which the second upper air outlet 7101 and the second lower air outlet 7102 are opened. The double cylinders are in a fresh air introduction drying process, and the drying air flow direction is: fresh air inlet 6103-ambient environment-first air distribution assembly 6-main drying air duct 51-second air distribution assembly 7-first clothes treatment cylinder 1 (second clothes treatment cylinder 2), and the air flow direction is as shown in Figure 7 .

[0076] If the temperature difference between the inlet air temperature and the outlet air temperature is greater than or equal to the set temperature difference, it indicates that the compressor is not in a high-frequency operating condition, and the double-cylinder internal circulation drying process is continued until the drying is completed.

[0077] S1203, continue to obtain the compressor discharge temperature, and in the case that the compressor discharge temperature is less than the second set temperature, the first air distribution component 62 is restored to the first working position.

[0078] In the embodiment, when the double cylinders are in the fresh air introduction drying process, and the discharge temperature is less than or equal to the second set temperature, it indicates that, with the introduction of fresh air from the outside, the fresh air flows through the heat exchange assembly 3 and the first clothes treatment cylinder 1 and the second clothes treatment cylinder 2, and the temperature of the entire drying environment is reduced, and the frequency of the compressor is reduced with the reduction of the operating temperature, thereby avoiding continuous high-frequency operation of the compressor. The second set temperature is less than the first set temperature. At this time, the double-cylinder fresh air introduction drying process is stopped, and the double cylinders are restored to the double-cylinder internal circulation drying process by restoring the first air distribution component 62 to the first working position.

[0079] The drying method of the embodiment aims to reduce the operating load of the heat exchange assembly 3 and the compressor and prolong the service life of the compressor when the temperature in the cylinder is too high in the later stage of the double-cylinder simultaneous drying process, which causes the variable-frequency compressor to continuously work at a high frequency. For different weight loads, the following situations exist: the load has a high moisture content in the double-cylinder simultaneous drying process, and the temperature in the cylinder is high in the later stage of the drying process. Through the control method, the compressor discharge pipe temperature can enter the fresh air drying state multiple times. The load has a low moisture content in the double-cylinder simultaneous drying process, and the temperature in the cylinder is relatively low in the later stage of the drying process. Through the control method of the embodiment, the inlet and outlet air temperatures of the main drying air duct 51 are used to determine that the fresh air drying process is performed a few times, and there is a situation in which the fresh air drying process is not entered again.

[0080] In the description of the application, reference to "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Moreover, the usage of the terms "first", "second" or "third" does not limit the quantity or order of the specific features, structures, materials or characteristics, but rather the terms are used to distinguish between different sets of the same or similar features, structures, materials or characteristics. Thus, a feature described as a "first" feature can also be a "second" feature, and vice versa.

[0081] Furthermore, the terms "first", "second", or the like, are used only to describe different features, and do not imply or suggest relative importance of, or a number of, the indicated technical features. Thus, a feature defined with "first", "second" can explicitly or implicitly include at least one of the feature. In the description of the application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise explicitly specifically limited.

[0082] Any process or method descriptions or blocks in flow charts or otherwise described herein represent embodiments which can be managed as one or more modules, segments, or portions of code which include one or more executable instructions for implementing specific logic functions or steps, and alternate implementations are possible. In some embodiments, the processes and methods described can be executed by one or more apparatuses or devices, either directly or after conversion to another language.

[0083] The logic and / or steps represented in the flow diagrams and / or otherwise described herein, for example, can be considered as a sequence of instructions to implement logic functions, and can be realized in any computer-readable medium for use by an instruction execution system, apparatus, or device, such as a computer-based system, processor- containing system, or other system that can fetch instructions from the instruction execution system, apparatus, or device and execute the instructions. In the context of this specification, a "computer-readable medium" can be any means that can contain, store, communicate, propagate or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium include the following: an electronic connection having one or more wires (electrical, optical and / or other connections), a portable computer diskette, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable medium can even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, for example, via the optical scanning of the paper or other medium, then compiled, interpreted, or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.

Claims

1. An air duct system for a dual barrel laundry treating apparatus, characterized by, The air duct system comprises: an air inlet assembly comprising an upper air inlet duct and a lower air inlet duct; an air outlet assembly comprising an upper air outlet duct and a lower air outlet duct; a main drying air duct arranged between the air inlet assembly and the air outlet assembly; a first air distribution assembly comprising a first air distribution shell and a first air distribution member, the first air distribution shell defining a first air distribution cavity therein, the first air distribution shell being provided with a first main air port, a first upper air branch port, a first lower air branch port and a fresh air inlet, the first main air port being in communication with the fresh air inlet, the first upper air branch port being in communication with the upper air outlet duct, the first lower air branch port being in communication with the lower air outlet duct, the first air distribution member being arranged in the first air distribution cavity, the first air distribution member having at least a first working position in which the first upper air branch port and the first lower air branch port are simultaneously opened and the fresh air inlet is closed, a second working position in which one of the first upper air branch port and the first lower air branch port is opened and the other is closed and the fresh air inlet is closed, and a third working position in which the first upper air branch port, the first lower air branch port and the fresh air inlet are simultaneously opened, the first air distribution member being switchable between the first working position, the second working position and the third working position; a second air distribution assembly comprising a second air distribution shell and a second air distribution member, the second air distribution shell defining a second air distribution cavity therein, the second air distribution shell being provided with a second main air port, a second upper air branch port and a second lower air branch port, the second main air port being in communication with the main drying air duct, the second upper air branch port being in communication with the upper air inlet duct, the second lower air branch port being in communication with the lower air inlet duct, the second air distribution member being arranged in the second air distribution cavity, the second air distribution member having at least a fourth working position in which the second upper air branch port and the second lower air branch port are simultaneously opened, and a fifth working position in which one of the second upper air branch port and the second lower air branch port is opened and the other is closed, the second air distribution member being switchable between the fourth working position and the fifth working position; the first air distribution cavity comprises a first cylindrical cavity, the first upper air branch port and the first lower air branch port being arranged in a first side wall along a circumferential direction of the first cylindrical cavity, the first air distribution member being rotatably arranged in a first bottom wall along an axial direction of the first cylindrical cavity, an axis of rotation of the first air distribution member being coaxial with an axis of the first cylindrical cavity, the first main air port being arranged opposite to the first bottom wall, the first air distribution member comprising a first abutting surface and a second abutting surface connected to each other, the first abutting surface being arranged in abutment with the first side wall, the second abutting surface being arranged in abutment with the first bottom wall, the fresh air inlet being arranged in the first bottom wall, the second abutting surface being provided with a bypass port; The first fitting surface opens the first upper branch air outlet and the first lower branch air outlet simultaneously when the first branch air distributing member is in the first working position, and closes the fresh air inlet; the first fitting surface opens one of the first upper branch air outlet and the first lower branch air outlet and closes the other one when the first branch air distributing member is in the second working position, and closes the fresh air inlet; the first fitting surface opens the first upper branch air outlet and the first lower branch air outlet simultaneously when the first branch air distributing member is in the third working position, and the fresh air inlet coincides with the avoiding opening.

2. The air duct system of claim 1, wherein, The first side wall comprises a first arc segment, a second arc segment, a third arc segment and a fourth arc segment connected in sequence along the circumferential direction of the first cylindrical cavity, the first upper branch air outlet is arranged in the first arc segment, the first lower branch air outlet is arranged in the third arc segment, the arc length of the first arc segment is L1, the arc length of the second arc segment is L2, the arc length of the third arc segment is L3, the arc length of the fourth arc segment is L4, the arc length of the second fitting surface is L0, and the following conditions are met: L4>L2, L0>L1, L0>L2, L0>L3, and L0≤L4, L0 3. A duct system according to claim 1 or 2, characterised in that, The fresh air inlet has a larger air inlet area than the sum of the air inlet areas of the first upper branch air outlet and the first lower branch air outlet when the first branch air distributing member is in the third working position.

4. The air duct system of claim 1, wherein, The first branch air distributing member also has a sixth working position in which one of the first upper branch air outlet and the first lower branch air outlet is opened and the other one is closed, and the fresh air inlet is opened, and the first branch air distributing member can be controlled to switch between the first working position, the second working position, the third working position and the sixth working position.

5. The air duct system of claim 4, wherein, The second fitting surface comprises a first fitting part and a second fitting part arranged along the radial direction of the first cylindrical cavity, and the rotation axis of the first branch air distributing member is located between the first fitting part and the second fitting part, the first fitting surface is connected with the first fitting part, the avoiding opening is arranged in the second fitting part, and the fitting area of the first fitting part and the first bottom wall is larger than the fitting area of the second fitting part and the first bottom wall; The first fitting surface opens one of the first upper branch air outlet and the first lower branch air outlet and closes the other one, and the second fitting surface completely opens or partially opens the fresh air inlet when the first branch air distributing member is in the sixth working position.

6. The air duct system of claim 1, wherein, The second branch air distributing cavity comprises a second cylindrical cavity, the second upper branch air outlet and the second lower branch air outlet are arranged in a second side wall along the circumferential direction of the second cylindrical cavity, the second branch air distributing member is arranged in a second bottom wall along the axial direction of the second cylindrical cavity, the rotation axis of the second branch air distributing member is coaxial with the axis of the second cylindrical cavity, the second main air outlet is arranged opposite to the second bottom wall, and the second branch air distributing member comprises a third fitting surface connected therewith, and the third fitting surface is arranged in abutment with the second side wall. When the second air distributing member is in the fourth working position, the third abutting surface opens both the second upper air branch and the second lower air branch; when the second air distributing member is in the fifth working position, the third abutting surface opens one of the second upper air branch and the second lower air branch and closes the other one.

7. The air duct system of claim 1, wherein, The first air distributing assembly further comprises a first driving component connected with the first air distributing member, and the first driving component drives the first air distributing member to switch among the first working position, the second working position and the third working position. The second air distributing assembly further comprises a second driving component connected with the second air distributing member, and the second driving component drives the second air distributing member to switch between the fourth working position and the fifth working position.

8. A twin-tub laundry treating apparatus, characterized by, The double-cylinder clothes treating apparatus comprises: a first clothes treating cylinder and a second clothes treating cylinder arranged in sequence from top to bottom; a heat exchanging assembly and an air fan assembly; The air duct system of any one of claims 1-7, wherein the main drying air duct is arranged between the first clothes treating cylinder and the second clothes treating cylinder, the heat exchanging assembly and the air fan assembly are arranged in the main drying air duct, the air outlet end of the upper air inlet duct is in communication with the upper air inlet of the first clothes treating cylinder, the air outlet end of the lower air inlet duct is in communication with the lower air inlet of the second clothes treating cylinder, the air inlet end of the upper air outlet duct is in communication with the upper air outlet of the first clothes treating cylinder, and the air inlet end of the lower air outlet duct is in communication with the lower air outlet of the second clothes treating cylinder. The drying process of the clothes treating apparatus in the double-cylinder drying mode comprises an internal circulation drying process and a fresh air induction drying process; in the internal circulation drying process, the first air distributing member is in the first working position, and the second air distributing member is in the fourth working position; in the fresh air induction drying process, the first air distributing member is in the third working position, and the second air distributing member is in the fourth working position.

9. A drying method of a dual tub laundry treating apparatus, characterized by, The drying method is used for controlling the double-cylinder clothes treating apparatus of claim 8, and the drying method comprises: when the double-cylinder clothes treating apparatus is in the double-cylinder drying mode, controlling the first air distributing member to be in the first working position and controlling the second air distributing member to be in the fourth working position; acquiring an exhaust temperature of a compressor of the double-cylinder clothes treating apparatus, and when the exhaust temperature is greater than a first set temperature, controlling the first air distributing member to be in the third working position; acquiring the exhaust temperature again, and when the exhaust temperature is less than a second set temperature, restoring the first air distributing member to the first working position.

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