Air duct waterproof structure, drying air duct and washing and drying all-in-one machine

Abstract

An air duct waterproof structure, a drying air duct and a washing and drying all-in-one machine, the air duct comprises a door air duct arranged in a door assembly, the door air duct is provided with an air inlet, and the air duct waterproof structure is characterized in that the door assembly comprises a door body capable of being opened and closed and a door panel fixed with the door body; a cavity capable of containing the air channel in the door is formed between the door panel and the door body, a first air opening capable of being communicated with an air inlet of the air channel in the door is formed in the door body, the door body is further provided with a door protruding part capable of stretching into the inner washing barrel, and a second air opening capable of being communicated with the inner washing barrel is formed in the door protruding part. The waterproof door has the advantages that the waterproof structure and the door body are directly integrally formed, the air inlet path is prolonged through the double-air-opening structure, water and / or foam splashed during washing can be prevented from directly entering the drying air channel from the air openings, and the effective waterproof effect is achieved; the flushing opening is further formed in the door body, an additional cleaning device does not need to be added, and more cost is saved.

Description

Technical Field

[0001] The invention relates to an air duct waterproof structure, in particular to a waterproof structure of an air duct in a door and a drying air duct using the waterproof structure, as well as a washer-dryer using the drying air duct. Background Art

[0002] In the prior art, the drying duct of most washing and drying machines is arranged at the top of the clothes drum. The existing Chinese utility model patent "Washing and Drying Machine" with patent number ZL202220506887.1 discloses a structure in which the drying duct is arranged on the top of the equipment; however, since the top space of the washing and drying machine cannot be enlarged, the fluid space of the drying duct is small and the pipeline resistance is large, resulting in a small drying air volume of the washing and drying machine, which ultimately leads to problems such as long drying time, low drying efficiency, and high energy consumption.

[0003] To this end, the Chinese utility model "A Household Appliance" with patent number ZL202121952991.5 discloses a structure in which the drying air duct is located at the bottom of the shell. This patent arranges the guide device at one end of the shell assembly. The user can directly understand the working status of the guide device only from the appearance of the shell assembly, so that the work of the guide device is visualized, which is convenient for the user to change the working status of the guide device according to actual needs.

[0004] However, the drying air duct in the above patent also passes through the door body, but the air duct on the door body is not provided with an effective waterproof structure. If the device is used for washing, washing water or foam can easily enter from the ventilation holes opened on the door body. After long-term use, it is easy to harbor dirt and reduce the drying effect, and even affect the service life of the device.

[0005] There is also a Chinese utility model patent with patent number 202022600605.8 "Host and dryer with waterproof structure", which discloses a host and dryer with a waterproof structure. The drying module is arranged in the shell cavity, which is used to generate hot air and output it outward through the air outlet. The waterproof cover is arranged on the upper side of the drying module and corresponds to the assembly gap between the front shell and the rear shell, which is used to block the liquid entering through the assembly gap; however, the waterproof structure of this patent can only be used for a single dryer without a washing program, and is suitable for blocking a small number of condensed water droplets, etc. For a washing and drying machine, during the washing process, the waterproof structure of this patent cannot effectively prevent splashed washing water or foam from entering the drying air duct, and the waterproof structure cannot be effectively applied to existing washing and drying equipment.

[0006] To summarize, in the prior art, with regard to the arrangement structure of the drying air duct passing through the door body, it is necessary to take into account the problem that water or foam during the washing process may splash into the door air duct, and it is necessary to design a reasonable waterproof structure for the door air duct to prevent water or foam from entering the entire drying air duct, prevent damage to the drying components, and ensure the reliability and safety of the washer-dryer equipment. Summary of the invention

[0007] The first technical problem to be solved by the present invention is to provide an air duct waterproof structure with better waterproof effect and capable of realizing automatic flushing of the air duct inlet in response to the above-mentioned existing technical status.

[0008] The second technical problem to be solved by the present invention is to provide a drying air duct realized by using the above-mentioned water retaining structure in response to the above-mentioned existing technical status.

[0009] The third technical problem to be solved by the present invention is to provide a washer-dryer that adopts the above-mentioned water retaining structure and drying air duct to realize the operation in response to the above-mentioned existing technical status.

[0010] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a waterproof structure of an air duct, the air duct includes a door air duct arranged in a door assembly, the door air duct has an air inlet, and is characterized in that: the door assembly includes an openable and closable door body and a door panel fixed to the door body, a cavity that can accommodate the door air duct is formed between the door panel and the door body, a first air outlet that can be connected to the air inlet of the door air duct is provided on the door body, the door body also has a door protrusion that can be extended into the washing inner drum, and the door protrusion is provided with a second air outlet that can penetrate the washing inner drum.

[0011] In order to facilitate the smooth closing and opening of the door body, as a preferred embodiment, the door protrusion is in the shape of a truncated cone with one end large and the other end small, and the door protrusion includes a truncated cone-shaped circumferential side surface inclined from the large end to the small end, and a first side surface and a second side surface respectively located at both ends of the circumferential side surface and parallel to each other; wherein the first side surface is located at the large end of the door protrusion, the first side surface is provided with the first air outlet, and the circumferential side surface of the door protrusion is provided with the second air outlet. The truncated cone-shaped door protrusion can prevent water droplets from flowing back outside the door body on the one hand, and can also cooperate with the convex ribs of the inner drum to improve the effect of shaking out the clothes and prevent the clothes from hanging on the door body on the other hand.

[0012] In order to allow wind to smoothly pass into the air duct in the door, preferably, the first air outlet of the door protrusion is a grid hole whose size matches the air inlet of the air duct in the door.

[0013] In order to reduce the washing water or foam from directly pouring into the air passage in the door, preferably, the second air outlets provided on the circumferential side of the door protrusion are fence holes provided at intervals along the circumference. The fence holes provided on the circumferential side of the door protrusion can effectively reduce the washing water from splashing into the hollow inner cavity of the door protrusion in large quantities, compared with the fence holes provided directly on the front panel of the door protrusion, and have a better waterproof effect.

[0014] In order to further prevent foam or washing water from entering the air duct in the door, preferably, a flushing port that can be connected to an external water channel is further provided at the top of the circumferential side surface of the door protrusion. The function of the flushing port is to flush the vicinity of the first air duct of the door protrusion. When foam is attached to the first air duct, the water sprayed through the flushing port can clean the outside of the first air duct, thereby flushing away the foam and / or washing water, and finally reducing or preventing foam and / or washing water from entering the air duct in the door, further improving the waterproof effect of the air duct.

[0015] In order to more comprehensively clean the hollow inner cavity of the door protrusion, preferably, a hollow inner cavity is formed between the first side surface, the circumferential side surface and the second side surface of the door protrusion, and a flow guide tube is formed on the inner wall of the hollow inner cavity, and both ends of the flow guide tube are open. The first opening of the flow guide tube connects the flushing port with the hollow inner cavity, and the second opening of the flow guide tube connects the flow guide tube with the hollow inner cavity. The flow guide tube can divert the water sprayed from the flushing port and distribute it to the hollow inner cavity of the door protrusion, thereby improving the cleaning effect.

[0016] In order to better flush the side wall of the hollow inner cavity of the door protrusion, preferably, the guide pipe is arranged along the truncated cone-shaped generatrix of the door protrusion. Thus, the water flowing out of the flushing port can eventually flow away along the first side and the second side through the guide pipe.

[0017] In order to take into account drainage efficiency while diverting water and avoid excessive water accumulation in the hollow inner cavity of the door protrusion, as a further preference, the first side is provided with at least one first diversion branch pipe at the bottom of the first opening of the diversion pipe, and the bottom of the first diversion branch pipe is open, and water flows out from the flushing port through the first opening and the first diversion branch pipe.

[0018] In order to improve the efficiency of flushing, preferably, the first diversion branch pipe extends along the arc line formed by the intersection line of the first side surface and the circumferential side surface, and there are two first diversion branch pipes which are respectively located on two symmetrical sides of the bottom of the first opening.

[0019] In order to further improve the drainage efficiency and ensure comprehensive flushing of the hollow inner cavity, preferably, each of the first diversion branches is provided with a first overflow groove at intervals on the wall of the first diversion branch. The water flowing out of the first overflow groove can pass through different positions on the two sides of the hollow inner cavity.

[0020] In order to take into account drainage efficiency while guiding the flow, it is preferred that the second side is provided with at least one second diversion branch pipe at the bottom of the second opening of the diversion pipe, the bottom of the second diversion branch pipe is open, and water flows out from the flushing port through the diversion pipe and the second diversion branch pipe.

[0021] In order to improve the efficiency of flushing, preferably, the second guide branch pipe extends along the arc line formed by the intersection line of the second side surface and the circumferential side surface, and there are two second guide branch pipes which are respectively located on two symmetrical sides of the bottom of the second opening.

[0022] In order to further improve the drainage efficiency and ensure comprehensive flushing of the side wall of the hollow inner cavity, preferably, a second overflow groove is spaced apart on the wall of each of the second diversion branches.

[0023] In order to ensure smooth drainage and accelerate the drainage speed, preferably, the hollow inner cavity is further provided with a drainage port at the bottom of the circumferential side surface.

[0024] In order to improve the aesthetics of the door body and facilitate installation and positioning, preferably, the door assembly also includes a door frame, which is mounted outside the door body and exposes the door protrusion of the door body, and a through hole is opened at the bottom of the door frame which can be connected to the air duct in the door.

[0025] In order to improve the installation reliability of the door assembly and the sealing performance of the entire equipment, preferably, a sealing ring is further provided between the door frame and the washing outer barrel, the door protrusion has a hollow inner cavity, and the sealing ring is provided with a cleaning water inlet which can be connected to the hollow inner cavity of the door protrusion and connected to an external water circuit.

[0026] The technical solution adopted by the present invention to solve the above second technical problem is: a drying air duct, characterized in that: the drying air duct includes

[0027] An external air duct is arranged at the bottom of the washing outer barrel of the washer-dryer, and one end of the external air duct has an air outlet that can be connected to the washing inner barrel of the washer-dryer;

[0028] The air duct in the door is arranged on the openable door body of the washer-dryer and is connected to the other end of the external air duct, and the air duct in the door has an air inlet that can be connected to the washing inner drum;

[0029] Among them, the external air duct and the air duct in the door are connected in sequence to form a closed pipeline, the air outlet of the external air duct is the exhaust outlet of the entire drying air duct, and the air inlet of the air duct in the door is the air inlet of the entire drying air duct; when the door body is closed, the air inlet of the air duct in the door is provided with the air duct waterproof structure as described above.

[0030] The technical solution adopted by the present invention to solve the above-mentioned third technical problem is: a washing and drying machine, including a casing and a washing inner drum and a washing outer drum arranged in the casing, characterized in that: the casing is also provided with the drying air duct as described above.

[0031] Compared with the prior art, the advantages of the present invention are: the waterproof structure is directly integrally formed with the door body, and two air outlets, the first air outlet and the second air outlet, are arranged on the door body. The double air outlet structure extends the air inlet path, which can prevent water and / or foam splashed during washing from directly entering the drying duct from the air outlet, thereby playing an effective waterproof role; a flushing port is also arranged on the door body, and external water is used as a power source to flush the washing water and / or foam in the door body cavity and on the first air outlet, without the need to add additional cleaning devices, which is more cost-effective and convenient to assemble; the space of the door convex part of the door body is cleverly utilized, not only the air duct in the door is accommodated in the door body, but also the door convex part is used to achieve a double-layer waterproof effect, the structure is simple and compact, the waterproof effect is better, and the practicability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a three-dimensional cross-sectional view of the assembly structure of the washer-dryer according to an embodiment of the present invention.

[0033] Figure 2 It is a three-dimensional cross-sectional view (partially enlarged) of the air duct waterproof structure according to an embodiment of the present invention.

[0034] Figure 3 for Figure 2 A three-dimensional exploded view of the air duct waterproof structure shown.

[0035] Figure 4 This is one of the three-dimensional cross-sectional views of the door body in the door assembly according to an embodiment of the present invention.

[0036] Figure 5 This is the second three-dimensional cross-sectional view of the door body in the door assembly according to an embodiment of the present invention.

[0037] Figure 6 It is a schematic diagram of the three-dimensional structure of the door body in the door assembly of an embodiment of the present invention.

[0038] Figure 7 This is the third three-dimensional cross-sectional view of the door body according to an embodiment of the present invention.

[0039] Figure 8 It is a three-dimensional cross-sectional view of a sealing ring in a door assembly according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below with reference to the accompanying drawings.

[0041] like Figure 1As shown, this embodiment discloses a washer-dryer, which includes a housing 1, a door assembly, and a washing tub arranged in the housing 1, wherein the washing tub includes a washing inner tub 2 and a washing outer tub 3, a front cover 21 and a rear cover 22 are respectively arranged at both ends of the washing inner tub 2, the washing outer tub 3 is closed, a motor assembly 31 is arranged at the rear of the washing outer tub, and washing water is located in an interlayer cavity formed between the washing inner tub 2 and the washing outer tub 3 (the water level of the washing tub is the water level in the washing outer tub 3);

[0042] The drying air duct of the present embodiment includes three sections of detachable and connected air ducts, which are respectively an air inlet duct 41, a main body air duct 42 and a door duct 43. The above-mentioned air inlet duct 41, main body air duct 42 and door duct 43 are connected in sequence to form a closed pipeline, wherein the air inlet duct 41 and the main body air duct 42 are external air ducts, the air inlet duct 41 has an air outlet that can be connected to the washing inner drum 2, and the air outlet is the exhaust outlet of the entire drying air duct; the main body air duct 42 is arranged at the bottom of the washing outer drum 3 of the washer-dryer and is connected to the air inlet duct 41; the door duct 43 is arranged in the openable door body 6 of the washer-dryer, and the door duct 43 has an air inlet 431 that can be connected to the washing inner drum 2, and the air inlet 431 is also the air inlet of the entire drying air duct.

[0043] The casing 1 and washing tub of the washer-dryer of this embodiment are of conventional structures. The basic structure of the dryer and the specific arrangement of the drying air duct in the casing 1 can refer to my utility model patent application number 202320564551.5, entitled "A drying air duct and a washer-dryer using the same".

[0044] like Figure 2-Figure 3 As shown, in this embodiment, a waterproof structure is provided at the air inlet 431 of the door air duct 43 of the drying air duct, and the waterproof structure is realized by a door assembly, wherein the door assembly includes a fixed door frame 5, an openable door body 6, and a door panel 7 fixedly connected to the door body 6, wherein a cavity for accommodating the door air duct 43 is formed between the door panel 7 and the door body 6, the door body 6 has a door protrusion 61 that can extend into the washing inner drum 2, and a first through hole 62 that can be connected to the air outlet 432 of the door air duct 43 is provided at the bottom of the door body 6, see Figure 6 The door frame 5 is sleeved outside the door body 6 so that the door protrusion 61 of the door body 6 is exposed. The bottom of the door frame 5 is provided with a second through hole 51 which can be connected with the air outlet 432 of the air duct 43 in the door and is connected with the first through hole 62.

[0045] In order to facilitate the door body 6 to be closed and opened smoothly, the door protrusion 61 is in the shape of a truncated cone with one end larger and the other end smaller. The door protrusion 61 includes a truncated cone-shaped circumferential side surface 611 inclined from the large end to the small end, and a first side surface 612 and a second side surface 613 respectively located at both ends of the circumferential side surface 611 and parallel to each other, see Figure 4-5 , Figure 7 The door protrusion 61 of the truncated cone structure forms a certain inclined surface, which can prevent the washing water from flowing back to the outside of the door body 6 on the one hand, and can cooperate with the convex ribs of the inner drum on the other hand to improve the shaking effect of the clothes and prevent the clothes from hanging on the door body 6; wherein, the first side surface 612 is located at the large end of the door protrusion 61, and a first air outlet 614 that can be connected to the air inlet 431 of the air duct 43 in the door is opened on the first side surface 612, and the second side surface 613 is located at the small end of the door protrusion, and a second air outlet 615 that can be connected to the washing inner drum 2 is opened on the circumferential side surface 611 of the door protrusion 61.

[0046] In order to allow the wind to smoothly flow into the door air passage 43, the first air opening 614 provided on the door protrusion 61 is a grid hole whose size matches the air inlet 431 of the door air passage 43, and the second air opening 615 provided on the circumferential side surface 611 of the door protrusion 61 is a fence hole arranged at intervals along the circumference. The fence hole is provided along the circumferential side surface 611 of the door protrusion 61. Compared with the fence hole provided directly on the second side surface 613 of the door protrusion 61, it can effectively reduce the washing water from being directly poured into the hollow inner cavity 63 of the door protrusion 61. The water droplets on the circumferential side surface 611 will flow back into the washing inner drum 2 along the inclination angle of the frustum surface of the door protrusion 61, achieving a better waterproof effect.

[0047] In order to further prevent foam or washing water from entering the door air duct 43, the door protrusion 61 is further provided with a flushing port 616 at the top of the circumferential side surface 611 which can be connected to the external water channel, see Figure 2 The function of the flushing port 616 is to utilize an external water channel to flush the vicinity of the first air outlet 614 of the door protrusion 61. When foam adheres to the first air outlet 614, the water sprayed from the flushing port 616 can clean the vicinity of the first air outlet 614, thereby dispersing the foam, and ultimately reducing or preventing the foam from entering the first air outlet 614 of the air duct 43 in the door, further improving the waterproof effect of the air duct.

[0048] In order to more comprehensively clean the hollow inner cavity 63 of the door protrusion 61, a hollow inner cavity 63 is formed between the first side surface 612, the circumferential side surface 611 and the second side surface 613 of the door protrusion 61. A flow guide tube 64 is formed on the inner side wall of the hollow inner cavity 63. Figure 4-5The two ends of the guide tube 64 are open. The first opening 641 of the guide tube 64 connects the flushing port 616 with the hollow inner cavity 63. The second opening 642 of the guide tube 64 connects the guide tube 64 with the hollow inner cavity 63. The guide tube 64 can divert the water sprayed from the flushing port 616, thereby distributing it to the hollow inner cavity 63 of the door protrusion 61, thereby improving the cleaning effect.

[0049] In order to better flush various positions in the hollow inner cavity 63 of the door protrusion 61, the guide pipe 64 is arranged along the truncated cone-shaped generatrix of the door protrusion 61, wherein the first side surface 612 is provided with at least one first guide branch pipe 65 at the bottom of the first opening 641 located at the guide pipe 64, and the first guide branch pipe 65 extends along the arc line formed by the intersection line of the first side surface 612 and the circumferential side surface 611, and the bottom of the first guide branch pipe 65 is open, and the pipe wall of the first guide branch pipe 65 is also spaced apart with a first overflow groove 651, see Figure 7 The water flows out from the flushing port 616 through the first opening 641 , the first overflow groove 651 of the first guide branch pipe 65 , and the bottom opening of the first guide branch pipe 65 . The water flowing out from the first overflow groove 651 can pass through different positions on the two sides of the hollow inner cavity 63 .

[0050] Similarly, the second side surface 613 is provided with at least one second flow guiding branch pipe 66 at the bottom of the second opening 642 of the flow guiding pipe 64. The second flow guiding branch pipe 66 extends along the arc line formed by the intersection line of the second side surface 613 and the circumferential side surface 611. The bottom of the second flow guiding branch pipe 66 is open, and the pipe wall of the second flow guiding branch pipe 66 is also spaced apart with a second overflow groove 661, see Figure 4 , Figure 5 and Figure 7 , water flows out from the flushing port 616 through the guide pipe 64, through the second opening 642, the second overflow groove 661 of the second guide branch pipe 66, and the bottom opening of the second guide branch pipe 66. Therefore, the water flowing out of the flushing port 616 can finally spread along the first side 612 and the second side 613 after passing through the guide pipe 64 and the guide branch pipe.

[0051] In order to improve the efficiency of flushing and ensure comprehensive flushing of the hollow inner cavity 63, two first diversion branches 65 and two second diversion branches 66 can be provided, and the two first diversion branches 65 are respectively located on two symmetrical sides of the bottom of the first opening 641, and the two second diversion branches 66 are respectively located on two symmetrical sides of the bottom of the second opening 642. Figure 7 A partial enlarged view of the .

[0052] In order to improve drainage, avoid excessive water accumulation in the hollow inner cavity 63 of the door protrusion 61 , and speed up drainage, a drainage port 631 is further opened at the bottom of the circumferential side surface 611 of the hollow inner cavity 63 .

[0053] In order to improve the sealing performance of the connection between the door assembly and the washing tub, a sealing ring 8 is also provided between the door frame 5 and the washing tub 3. Figure 8 The sealing ring 8 is formed with a swimming ring-shaped annular channel 81 along the circumferential direction, and the inner ring of the sealing ring is provided with an annular groove 84 that can communicate with the annular channel 81 along the circumference; the top of the sealing ring 8 is provided with a cleaning water inlet 82 that can be connected with the hollow inner cavity 63 of the door protrusion 61 and the flushing port 616 on the door protrusion 61. In order to facilitate the connection of the external water circuit, the cleaning water inlet 82 is designed as a short straight pipe, and the short straight pipe is penetrated in the annular channel 81 of the sealing ring 8; one side of the sealing ring 8 has a pleated portion 83 that can be sealed and connected to the door frame 5, and the other side of the sealing ring 8 is sealed and connected to the washing outer barrel 3.

[0054] Therefore, when it is necessary to flush the hollow inner cavity 63 of the door protrusion 61, the external water channel is connected through Figure 1 The path indicated by the middle arrow flows: the flushing water flows out through the cleaning water inlet 82 of the sealing ring 8 through the flushing port 616 of the door protrusion 61, and then flows through the guide tube 64, and at the same time, it flows from the first guide branch 65 and the second guide branch 66 at both ends of the guide tube 64 to the hollow inner cavity 63 of the door protrusion 61. The dispersed water flow can simultaneously flush the air inlet 431 around the door air duct 43 and the side wall of the hollow inner cavity 63. The water accumulated in the hollow inner cavity 63 can flow out from the drain port 631 at the bottom of the door protrusion 61, and finally enter the annular channel 81 at the bottom of the sealing ring 8. Here, the interlayer cavity 9 formed between the washing inner drum 2 and the washing outer drum 3 is connected to the annular channel 81, so that the washing water can be returned to the washing drum, avoiding the washing water from entering the drying air duct, thereby playing an effective waterproof protection role for the drying air duct.

[0055] In this embodiment, a door protrusion 61 is directly arranged on the door body 6. The door protrusion 61 has a glass bowl-shaped structure on the door body 6 of an ordinary drum washing machine, and a double-layer structure with a cavity is designed at the door protrusion 61. The washing water during washing is separated by the hollow inner cavity. Even if it enters the hollow inner cavity, the foam and washing water can be flushed and drained through the guide structure and the flushing device to prevent water or foam from directly splashing into the air duct 43 in the door. The waterproof structure is compact and reasonable, and no additional parts need to be assembled. It can be integrated with the door body 6, and the production and installation costs can be reduced. It can be applicable to various types of washing and drying machines.

Claims

1. A wind duct waterproof structure, the wind duct comprising a door wind duct (43) arranged in a door assembly, the door wind duct (43) having an air inlet (431), characterized in that: The door assembly comprises an openable door body (6) and a door panel (7) fixed to the door body (6); a cavity for accommodating the air duct (43) in the door is formed between the door panel (7) and the door body (6); a first air outlet (614) which can be connected to an air inlet (431) of the air duct (43) in the door is provided on the door body (6); the door body (6) also has a door protrusion (61) which can extend into the washing inner drum (2); and a second air outlet (615) which can be connected to the washing inner drum (2) is provided on the door protrusion (61).

2. The air duct waterproof structure according to claim 1, characterized in that: The door protrusion (61) is in the shape of a truncated cone with one end being large and the other end being small, and the door protrusion (61) includes a truncated cone-shaped circumferential side surface (611) inclined from the large end to the small end, and a first side surface (612) and a second side surface (613) respectively located at the two ends of the circumferential side surface (611) and parallel to each other; wherein the first side surface (612) is located at the large end of the door protrusion (61), and the first air outlet (614) is provided on the first side surface (612), and a second air outlet (615) is provided on the circumferential side surface (611) of the door protrusion (61).

3. The air duct waterproof structure according to claim 2, characterized in that: The first air opening (614) of the door protrusion (61) is a grid hole whose size matches the air inlet (431) of the air duct (43) in the door.

4. The air duct waterproof structure according to claim 2, characterized in that: The second air outlets (615) opened on the circumferential side surface (611) of the door protrusion (61) are fence holes arranged at intervals along the circumferential direction.

5. The air duct waterproof structure according to claim 2, characterized in that: A flushing port (616) which can be connected to an external water channel is also provided at the top of the circumferential side surface (611) of the door protrusion (61).

6. The air duct waterproof structure according to claim 5, characterized in that: A hollow inner cavity (63) is formed between the first side surface (612), the circumferential side surface (611) and the second side surface (613) of the door protrusion (61), and a flow guide tube (64) is formed on the inner wall of the hollow inner cavity (63). Both ends of the flow guide tube (64) are open. The first opening (641) of the flow guide tube (64) connects the flushing port (616) with the hollow inner cavity (63), and the second opening (642) of the flow guide tube (64) connects the flow guide tube (64) with the hollow inner cavity (63).

7. The air duct waterproof structure according to claim 6, characterized in that: The flow guide pipe (64) is arranged along the truncated cone generatrix of the door protrusion (61).

8. The air duct waterproof structure according to claim 6, characterized in that: The first side surface (612) is provided with at least one first flow guiding branch pipe (65) at the bottom of the first opening (641) of the flow guiding pipe (64); the bottom of the first flow guiding branch pipe (65) is open, and water flows out from the flushing port (616) through the first opening (641) and the first flow guiding branch pipe (65).

9. The air duct waterproof structure according to claim 8, characterized in that: The first flow guiding branch pipe (65) extends along the arc line formed by the intersection line of the first side surface (612) and the circumferential side surface (611), and there are two first flow guiding branch pipes (65) which are respectively located on two symmetrical sides of the bottom of the first opening (641).

10. The air duct waterproof structure according to claim 8, characterized in that: First overflow grooves (651) are provided at intervals on the tube wall of each of the first flow guiding branches (65).

11. The air duct waterproof structure according to claim 6, characterized in that: The second side surface (613) is provided with at least one second flow guiding branch pipe (66) at the bottom of the second opening (642) of the flow guiding pipe (64); the bottom of the second flow guiding branch pipe (66) is open, and water flows out from the flushing port (616) through the flow guiding pipe (64) and the second flow guiding branch pipe (66).

12. The air duct waterproof structure according to claim 11, characterized in that: The second flow guiding branch pipe (66) extends along the arc line formed by the intersection line of the second side surface (613) and the circumferential side surface (611), and there are two second flow guiding branch pipes (66) which are respectively located on two symmetrical sides of the bottom of the second opening (642).

13. The air duct waterproof structure according to claim 11, characterized in that: Second overflow grooves (661) are spaced apart on the tube wall of each of the second flow guiding branches (66).

14. The air duct waterproof structure according to claim 6, characterized in that: The hollow inner cavity (63) is also provided with a drainage port (631) at the bottom of the circumferential side surface (611).

15. The air duct waterproof structure according to claim 1, characterized in that: The door assembly also includes a door frame (5), which is sleeved outside the door body (6) so that the door protrusion (61) of the door body (6) is exposed, and a second through hole (51) that can be connected to the air duct (43) in the door is opened at the bottom of the door frame (5).

16. The air duct waterproof structure according to claim 15, characterized in that: A sealing ring (8) is also provided between the door frame (5) and the washing outer barrel (3); the door protrusion (61) has a hollow inner cavity (63); and the sealing ring (8) is provided with a washing water inlet (82) which is communicated with the hollow inner cavity (63) of the door protrusion (61) and is connected to an external water channel.

17. A drying air duct, characterized in that: The drying air duct includes An external air duct is arranged at the bottom of the washing outer barrel (3) of the washer-dryer, and one end of the external air duct has an air outlet that can be connected to the washing inner barrel (2) of the washer-dryer; The door air duct (43) is arranged on the openable door body (6) of the washer-dryer and is connected to the other end of the external air duct. The door air duct (43) has an air inlet (431) that can be connected to the washing inner drum (2); Wherein, the external air duct and the door air duct (43) are connected in sequence to form a closed pipeline, the air outlet of the external air duct is the exhaust outlet of the entire drying air duct, and the air inlet (431) of the door air duct (43) is the air inlet of the entire drying air duct; when the door body (6) is in a closed state, the air inlet (431) of the door air duct (43) is provided with the air duct waterproof structure as described in any one of claims 1 to 16.

18. A washer-dryer, comprising a housing (1) and a washing inner drum (2) and a washing outer drum (3) arranged in the housing (1), characterized in that: The housing (1) is also provided with a drying air duct as claimed in claim 17.

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