Clothes dryer

Abstract

The invention discloses a clothes dryer, and belongs to the field of clothes dryers. The clothes dryer comprises a drying air duct and further comprises an outer cylinder, and a first air inlet is formed in the cylinder bottom of the outer cylinder and communicated with an air outlet of the drying air duct; the inner cylinder is rotatably arranged in the outer cylinder, the cylinder opening end of the inner cylinder communicates with the air inlet of the drying air duct, and a second air inlet is formed in the cylinder bottom end of the inner cylinder; and the non-return structure is arranged in the outer cylinder, one end of the non-return structure is arranged at the cylinder bottom of the outer cylinder and communicates with the first air inlet, and the other end of the non-return structure shields a gap between the cylinder bottom end of the inner cylinder and communicates with the second air inlet. The outer cylinder sleeves the inner cylinder, the non-return structure and the bottom end gap of the inner cylinder are blocked, hot air of the air outlet of the drying air duct sequentially passes through the bottom of the outer cylinder, the non-return structure and the bottom end of the inner cylinder, clothes are dried, and then the hot air enters the air inlet of the drying air duct from the opening end of the inner cylinder to form circulation; the outer cylinder plays a role in sealing a communication channel, a dynamic sealing structure is omitted, and noise is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of clothes dryers, and in particular, relates to a clothes dryer. Background Art

[0002] During the operation of the dryer, the drum of the dryer needs to be sealed and air needs to be taken in. Therefore, there are sealing structures at both ends of the dryer drum. Generally, it is a larger sealing ring composed of felt or a combination of felt and rubber. During the rotation of the drum, the huge friction structure produces a lot of noise.

[0003] Loud noise can seriously affect people's living quality. As people's living standards improve, users have also put forward higher requirements for the noise of dryers.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art, and the purpose is to provide a clothes dryer, in which an outer drum is arranged outside an inner drum, a gap between a non-return structure and the bottom end of the inner drum is blocked, and hot air from the air outlet of the drying air duct passes through the bottom of the outer drum, the non-return structure and the bottom end of the inner drum in turn, and after drying the clothes, enters the air inlet of the drying air duct from the mouth end of the inner drum to form a circulation, and the outer drum acts as a sealed communication channel, eliminating the dynamic sealing structure and reducing noise.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: to provide a clothes dryer, including a drying air duct, and also including:

[0007] An outer cylinder, wherein a first air inlet is provided at the bottom of the outer cylinder and is connected to an air outlet of the drying air duct;

[0008] The inner cylinder is rotatably arranged in the outer cylinder, the cylinder mouth end of the inner cylinder is connected with the air inlet of the drying air duct, and the cylinder bottom end of the inner cylinder is provided with a second air inlet;

[0009] The anti-return structure is arranged in the outer tube and extends from the bottom of the outer tube to the bottom of the inner tube. One end of the anti-return structure is arranged on the bottom of the outer tube and connected to the first air inlet, and the other end is blocked by a gap with the bottom end of the inner tube and connected to the second air inlet.

[0010] Furthermore, an auxiliary structure having a concave cavity is provided on the outer wall of the bottom of the inner cylinder, which is shielded by a gap with the anti-return structure, and the second air inlet is arranged in the auxiliary structure.

[0011] Furthermore, the anti-return structure is in a cylindrical shape, and the outer wall of the bottom of the inner cylinder is recessed inward to form the auxiliary structure;

[0012] The other end of the anti-return structure is shielded by a gap between the inner periphery of the auxiliary structure, and the second air inlet is arranged on the bottom wall of the auxiliary structure.

[0013] Furthermore, the anti-return structure is an elastic structure;

[0014] Preferably, a contact portion is provided on the outer peripheral wall of the other end of the anti-return structure, and is arranged close to the peripheral wall of the auxiliary structure.

[0015] Furthermore, the anti-return structure includes a plurality of connecting pieces, and the connecting pieces extend from the bottom of the outer cylinder to the bottom end of the inner cylinder, and the plurality of connecting pieces are sequentially arranged along the circumferential direction to form a cylindrical shape.

[0016] Furthermore, the projection of the anti-return structure on the bottom of the outer cylinder at least partially covers the first air inlet.

[0017] Furthermore, the other end of the anti-return structure is arranged close to the bottom wall of the auxiliary structure and is located at the periphery of the second air inlet.

[0018] Furthermore, the outer diameter of the anti-return structure decreases along the direction of wind flow, the inner diameter of the auxiliary structure decreases along the direction of wind flow, and the change rate of the inner diameter of the auxiliary structure is greater than the change rate of the outer diameter of the anti-return structure.

[0019] Further, the auxiliary structure comprises a circular bottom wall and an annular side wall, and the circular bottom wall is coaxially arranged with the inner cylinder;

[0020] The annular side wall comprises a first peripheral wall segment, a second peripheral wall segment and a third peripheral wall segment which are sequentially connected along the axial direction;

[0021] The first circumferential wall section is connected to the outer peripheral edge of the circular bottom wall, the inner diameter of the first circumferential wall section is smaller than the inner diameter of the third circumferential wall section, and the other end of the non-return structure is arranged in the first circumferential wall section.

[0022] Furthermore, the clothes dryer further comprises a box body, the outer drum is arranged in the box body, and a third air inlet is arranged on the rear side wall of the box body and is connected with the first air inlet;

[0023] The air outlet of the drying air duct is arranged on the outer wall of the rear side wall of the box body, and the air outlet of the drying air duct is connected to the third air inlet;

[0024] Preferably, the bottom of the outer cylinder is integrally arranged with the rear side wall of the box body.

[0025] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0026] (1) In the present invention, an outer cylinder is arranged outside the inner cylinder, and a gap between the anti-return structure and the bottom of the inner cylinder is blocked. The hot air from the air outlet of the drying air duct passes through the bottom of the outer cylinder, the anti-return structure and the bottom of the inner cylinder in sequence, and then enters the air inlet of the drying air duct from the cylinder mouth of the inner cylinder after drying the clothes to form a circulation. The outer cylinder plays the role of a sealed communication channel, eliminates the dynamic sealing structure, and reduces noise.

[0027] (2) In the present invention, the anti-return structure is configured as a deformable elastic structure. When the air intake volume or the air pressure in the anti-return structure is large, the other end of the anti-return structure expands, and the gap between the periphery of the anti-return structure and the auxiliary structure becomes smaller, which is beneficial to enhance the gap shielding effect between the anti-return structure and the auxiliary structure.

[0028] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0030] Figure 1 is a schematic diagram of a clothes dryer of the present invention;

[0031] Figure 2 The present invention Figure 1 Schematic diagram from another angle;

[0032] Figure 3 The present invention Figure 1 A schematic diagram from another angle;

[0033] Figure 4 The present invention Figure 3 Sectional view at AA in the middle;

[0034] Figure 5 The present invention Figure 4 The enlarged view of point B in the middle;

[0035] Figure 6 It is a schematic diagram of an implementation method of the stop reverse structure of the present invention;

[0036] Figure 7 It is a schematic diagram of another embodiment of the stop reverse structure of the present invention.

[0037] In the figure: 1. outer cylinder; 2. inner cylinder; 21. auxiliary structure; 211. circular bottom wall; 212. annular side wall; 22. connecting shaft; 3. anti-return structure; 31. connecting piece; 32. contact part; 4. box body; 5. transmission mechanism; 51. pulley; 52. belt; 6. motor.

[0038] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0040] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] like Figures 1 to 7 As shown, a clothes dryer according to the present invention comprises a drying air duct, an outer drum 1, an inner drum 2 and a backflow prevention structure 3.

[0043] The bottom of the outer cylinder 1 is provided with a first air inlet which is connected to the air outlet of the drying air duct.

[0044] The inner cylinder 2 is rotatably disposed in the outer cylinder 1 , the cylinder mouth end of the inner cylinder 2 is communicated with the air inlet of the drying air duct, and the cylinder bottom end of the inner cylinder 2 is provided with a second air inlet.

[0045] The non-return structure 3 is arranged in the outer tube 1, extending from the bottom of the outer tube 1 to the bottom of the inner tube 2, one end of the non-return structure 3 is arranged on the bottom of the outer tube 1 and connected with the first air inlet, and the other end is blocked by the gap at the bottom end of the inner tube 2 and connected with the second air inlet.

[0046] In the present invention, the outer cylinder 1 is arranged outside the inner cylinder 2, the anti-return structure 3 is shielded by the gap between the bottom end of the inner cylinder 2, and the hot air at the air outlet of the drying air duct passes through the bottom of the outer cylinder 1, the anti-return structure 3 and the bottom end of the inner cylinder 2 in sequence, and then enters the air inlet of the drying air duct from the cylinder mouth end of the inner cylinder 2 to form a circulation after drying the clothes. The outer cylinder 1 plays the role of a sealed communication channel, eliminates the dynamic sealing structure, and reduces noise.

[0047] Specifically, there is a gap between the bottom of the inner drum 2 and the bottom of the outer drum 1. A filtering mechanism is provided at the air inlet of the drying duct. When the clothes dryer is working, clothes will drop lint. The filtering mechanism can filter the lint, thereby preventing the lint from entering the drying duct and causing damage to the devices in the drying duct.

[0048] A dehumidification device, a heating device and a circulating fan are arranged in the drying air duct.

[0049] After the dehydrated clothes are placed in the inner drum 2, the dryer starts working, the inner drum 2 rotates, and the high-temperature dry air enters the first air inlet from the air outlet of the drying air duct, and then enters the non-return structure 3. Since the other end of the non-return structure 3 is blocked by the gap between the bottom end of the inner drum 2, the high-temperature dry air directly enters the second air inlet, and then enters the inner drum 2 to dry the clothes in the inner drum 2. The high-temperature dry air becomes low-temperature and humid air after drying the clothes.

[0050] Driven by the circulating fan, low-temperature and humid air enters the air inlet of the drying duct, the filtering mechanism can filter lint in the low-temperature and humid air, and then the dehumidification device dehumidifies the low-temperature and humid air to transform it into low-temperature dry air. The heating device can heat the low-temperature dry air and transform it into high-temperature dry air. The high-temperature dry air flows to the air outlet of the drying duct and circulates to dry the clothes.

[0051] In the prior art, a separate drum is provided, both ends of the drum are dynamic seals, and the sealing structure is in contact with the drum. When the drum rotates, the friction between the drum and the sealing structure will generate a large noise. In the present invention, the relevant dynamic sealing structure is eliminated, and the outer drum 1 is added outside the inner drum 2. The outer drum 1 is in a fixed state and plays the role of a sealed communication channel. The outer drum 1 is equivalent to the outer air duct of the drying area. After the hot air of the drying air duct enters the outer drum 1, the hot air is bound in the outer drum 1, and the hot air in the air outlet of the drying air duct can be introduced into the inner drum 2. When the inner drum 2 rotates in the outer drum 1, the inner drum 2 and the outer drum 1 are not in contact, and there is no friction between the two. Noise will not be generated due to friction, which is conducive to reducing noise.

[0052] The outer cylinder 1 is a cylindrical structure, such as a round cylinder and a square cylinder, etc. The cross-sectional shape of the outer cylinder 1 can be set to various shapes as long as the inner cylinder 2 does not rub against the outer cylinder 1 when rotating.

[0053] Preferably, the outer cylinder 1 is cylindrical.

[0054] By setting the non-return structure 3, the non-return structure 3 extends from the bottom of the outer cylinder 1 to the bottom of the inner cylinder 2, so that the hot air entering the first air inlet can be guided to the second air inlet and directly enter the inner cylinder 2. The other end of the non-return structure 3 is blocked by a gap between the bottom end of the inner cylinder 2, and the non-return structure 3 does not contact the bottom end of the inner cylinder 2, so that as much hot air as possible can directly enter the bottom end of the inner cylinder 2, reducing the hot air entering between the peripheral wall of the inner cylinder 2 and the peripheral wall of the outer cylinder 1.

[0055] like Figure 1 and Figure 5 As shown, an auxiliary structure 21 with a concave cavity is provided on the outer wall of the bottom of the inner cylinder 2 , which is shielded by a gap with the anti-return structure 3 , and the second air inlet is arranged in the auxiliary structure 21 .

[0056] Specifically, the anti-return structure 3 and the auxiliary structure 21 with a concave cavity are shielded by a gap, and the two are not in contact. The anti-return structure 3 and the auxiliary structure 21 are used together to guide the hot air in the first air inlet to the second air inlet, so that as much hot air as possible enters the inner drum 2, thereby improving the drying effect of the clothes.

[0057] In one embodiment of the present invention, the anti-return structure 3 is cylindrical, the auxiliary structure 21 is protrudingly arranged on the outer wall of the bottom of the inner tube 2, and the auxiliary structure 21 extends from the bottom of the inner tube 2 to the bottom of the outer tube 1.

[0058] Specifically, the auxiliary structure 21 is cylindrical and is adapted to the anti-return structure 3. The inner periphery of the anti-return structure 3 and the outer periphery of the auxiliary structure 21 are shielded by a gap, or the outer periphery of the anti-return structure 3 and the inner periphery of the auxiliary structure 21 are shielded by a gap.

[0059] Another embodiment of the present invention, as Figure 1 , Figure 2 and Figure 5 As shown, the anti-return structure 3 is cylindrical, and the outer wall of the bottom of the inner cylinder 2 is recessed inward to form the auxiliary structure 21.

[0060] The other end of the anti-return structure 3 is shielded by a gap between the inner circumference of the auxiliary structure 21 , and the second air inlet is arranged on the bottom wall of the auxiliary structure 21 .

[0061] Specifically, compared with the auxiliary structure 21 being protrudingly arranged on the outer wall of the bottom of the inner tub 2, the outer wall of the bottom of the inner tub 2 is recessed inward to form the auxiliary structure 21, which can reduce the distance between the bottom of the inner tub 2 and the bottom of the outer tub 1, and is conducive to enhancing the gap shielding effect between the other end of the non-return structure 3 and the auxiliary structure 21. The space of the outer tub 1 is limited, and reducing the distance between the bottom of the inner tub 2 and the bottom of the outer tub 1 can increase the axial length of the inner tub 2, thereby increasing the volume of the inner tub 2, and can hold more clothes.

[0062] like Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the anti-return structure 3 is an elastic structure.

[0063] Preferably, a contact portion 32 is provided on the outer peripheral wall of the other end of the anti-return structure 3 , and is arranged close to the peripheral wall of the auxiliary structure 21 .

[0064] In the above scheme, the anti-return structure 3 is set as a deformable elastic structure. When the air intake volume or the air pressure in the anti-return structure 3 is large, the other end of the anti-return structure 3 expands, and the gap between the outer periphery of the anti-return structure 3 and the auxiliary structure 21 will become smaller, which is beneficial to enhance the gap shielding effect between the anti-return structure 3 and the auxiliary structure 21.

[0065] Specifically, the anti-return structure 3 has a certain elasticity, is deformable and can return to its original shape after deformation, and is made of an elastic material, such as rubber.

[0066] When hot air enters one end of the non-return structure 3 from the first air inlet, the hot air continues to flow to the other end of the non-return structure 3. The hot air will cause the other end of the non-return structure 3 to expand and the inner diameter to increase. Therefore, the gap between the outer periphery of the non-return structure 3 and the auxiliary structure 21 will become smaller and the non-return structure 3 will not contact the auxiliary structure 21, which is beneficial to enhance the gap shielding effect between the other end of the non-return structure 3 and the auxiliary structure 21.

[0067] In some procedures, the air outlet of the drying air duct has a large air volume, which will cause the deformation of the other end of the anti-return structure 3 to be large, and the periphery of the anti-return structure 3 may contact the auxiliary structure 21, which may increase the noise. A plurality of contact portions 32 are provided on the peripheral wall of the anti-return structure 3, and the surface of the contact portion 32 is smooth and can be provided as a spherical protrusion or a hemispherical protrusion. If the deformation of the anti-return structure 3 is large, the contact portion 32 and the auxiliary structure 21 are in point and surface contact, which can reduce the noise.

[0068] One embodiment of the present invention, as Figure 6 As shown, the anti-return structure 3 can be designed as a complete cylindrical body.

[0069] Another embodiment of the present invention, as Figure 7 As shown, the anti-return structure 3 includes a plurality of connecting pieces 31, and the connecting pieces 31 extend from the bottom of the outer tube 1 to the bottom end of the inner tube 2, and the plurality of connecting pieces 31 are sequentially arranged along the circumferential direction to form a cylindrical shape.

[0070] Specifically, the anti-return structure 3 is an embodiment composed of a plurality of connecting pieces 31, and the structures of two adjacent connecting pieces 31 are different, one connecting piece 31 has a first notch at both ends of the lower side, and a first overlap portion is formed on the upper side; the other connecting piece 31 has a second notch at both ends of the upper side, and a second overlap portion is formed on the lower side. During installation, the first overlap portion overlaps the second overlap portion, and the plurality of connecting pieces 31 are arranged in sequence along the circumferential direction to form a cylindrical shape.

[0071] Another embodiment of the anti-return structure 3 is composed of a plurality of connecting pieces 31. The plurality of connecting pieces 31 have the same structure. The lower side of one end of the connecting piece 31 has a third notch, and the remaining upper side forms a third overlap portion; the upper side of the other end has a fourth notch, and the remaining lower side forms a fourth overlap portion. During installation, the third overlap portion overlaps the fourth overlap portion, and the plurality of connecting pieces 31 are arranged in sequence along the circumferential direction to form a cylindrical shape.

[0072] The plurality of connecting pieces 31 may also be provided in other forms, not limited to the above-mentioned embodiment, and may be arranged in a cylindrical shape.

[0073] The connecting piece 31 can be made of elastic material.

[0074] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the projection of the anti-return structure 3 on the bottom of the outer cylinder 1 at least partially covers the first air inlet.

[0075] Specifically, after the hot air flows out from the first air inlet, it directly flows to the non-return structure 3, and the non-return structure 3 has a better guiding effect; and the non-return structure 3 is more easily deformed under the action of the hot air, so as to reduce the gap between the non-return structure 3 and the auxiliary structure 21.

[0076] like Figure 5 As shown, the other end of the anti-return structure 3 is arranged close to the bottom wall of the auxiliary structure 21 and is located at the periphery of the second air inlet.

[0077] Specifically, the projection of the other end of the anti-return structure 3 on the inner drum 2 covers the second air inlet. The other end of the anti-return structure 3 is arranged close to the bottom wall of the auxiliary structure 21, so that as much hot air as possible can enter the second air inlet, thereby improving the drying effect on clothes.

[0078] The second air inlet can be configured as a plurality of circular holes, which are arranged into a plurality of concentric circles with different diameters, so as to increase the air flow velocity and help enhance the ventilation effect.

[0079] In one embodiment of the present invention, the outer diameter of the anti-return structure 3 increases along the direction of wind flow, and the inner diameter of the auxiliary structure 21 increases along the direction of wind flow.

[0080] Another embodiment of the present invention, as Figure 1 , Figure 2 and Figure 5 As shown, the outer diameter of the anti-return structure 3 decreases along the direction of wind flow, the inner diameter of the auxiliary structure 21 decreases along the direction of wind flow, and the change rate of the inner diameter of the auxiliary structure 21 is greater than the change rate of the outer diameter of the anti-return structure 3.

[0081] Specifically, the change rate of the inner diameter of the auxiliary structure 21 is greater than the change rate of the outer diameter of the non-return structure 3, and the interval between the outer periphery of the non-return structure 3 and the inner periphery of the auxiliary structure 21 becomes smaller and smaller, which is beneficial to enhancing the gap shielding effect between the non-return structure 3 and the auxiliary structure 21.

[0082] like Figure 5 As shown, the auxiliary structure 21 includes a circular bottom wall 211 and an annular side wall 212 , and the circular bottom wall 211 is coaxially arranged with the inner cylinder 2 .

[0083] The annular side wall 212 includes a first circumferential wall segment, a second circumferential wall segment and a third circumferential wall segment which are sequentially connected along the axial direction.

[0084] The first circumferential wall section is connected to the outer peripheral edge of the circular bottom wall 211 , the inner diameter of the first circumferential wall section is smaller than the inner diameter of the third circumferential wall section, and the other end of the non-return structure 3 is disposed in the first circumferential wall section.

[0085] Specifically, the inner diameters of the first peripheral wall segment, the second peripheral wall segment and the third peripheral wall segment increase sequentially.

[0086] The inner diameter change rate of the second circumferential wall segment is greater than that of the first circumferential wall segment, and the inner diameter change rate of the first circumferential wall segment is greater than that of the third circumferential wall segment. The other end of the non-return structure 3 is arranged in the first circumferential wall segment, and the gap between the non-return structure 3 and the first circumferential wall segment is smaller, which is beneficial to enhancing the gap shielding effect between the non-return structure 3 and the auxiliary structure 21.

[0087] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the clothes dryer further comprises a box body 4, the outer drum 1 is arranged in the box body 4, and a third air inlet is arranged on the rear side wall of the box body 4 and is connected with the first air inlet.

[0088] The air outlet of the drying air duct is arranged on the outer wall of the rear side wall of the box body 4, and the air outlet of the drying air duct is connected to the third air inlet.

[0089] Preferably, the bottom of the outer cylinder 1 is integrally formed with the rear side wall of the box body 4 .

[0090] Specifically, the front side wall of the box body 4 is provided with a clothing access opening, and the front side wall of the box body 4 is also provided with a rotatable door body, which can close or open the clothing access opening. The tube opening of the outer drum 1 and the tube opening of the inner drum 2 are both arranged forward. The tube opening of the outer drum 1 and the tube opening of the inner drum 2 are arranged corresponding to the clothing access opening, which is convenient for taking and putting clothes.

[0091] When the bottom of the outer cylinder 1 is integrally arranged with the rear side wall of the box body 4, the third air inlet is the first air inlet, the rear side wall of the box body 4 is the bottom of the outer cylinder 1, and one end of the non-return structure 3 is arranged on the rear side wall of the box body 4.

[0092] The clothes dryer further comprises a transmission mechanism 5 arranged outside the housing 4, the bottom end of the inner drum 2 is connected with a connecting shaft 22, the connecting shaft 22 passes through the rear side wall of the housing 4 and is connected to the transmission mechanism 5, a motor 6 is arranged in the housing 4, and the motor 6 is in transmission connection with the transmission mechanism 5. The connecting shaft 22 is arranged at the center of the bottom end of the inner drum 2, that is, at the center of the auxiliary structure 21. A reinforcing flange is arranged on the bottom wall of the auxiliary structure 21, and the reinforcing flange is sleeved on the connecting shaft 22, so as to strengthen the connection strength between the connecting shaft 22 and the inner drum 2. The auxiliary structure 21 is arranged in a recessed manner, and the reinforcing flange is located in the auxiliary structure 21, so as to reduce the interval between the bottom of the inner drum 2 and the bottom of the outer drum 1.

[0093] The transmission mechanism 5 includes a pulley 51 and a belt 52. The connecting shaft 22 passes through one end of the rear side wall of the box body 4 and is connected to the pulley 51. The output shaft of the motor 6 passes through the rear side wall of the box body 4 and is connected to the pulley 51 through the belt 52.

[0094] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A clothes dryer, comprising a drying air duct, characterized in that: Also includes, An outer cylinder (1), wherein a first air inlet is provided at the bottom of the outer cylinder (1) and is connected to an air outlet of the drying air duct; The inner cylinder (2) is rotatably arranged in the outer cylinder (1), the cylinder mouth end of the inner cylinder (2) is connected to the air inlet of the drying air duct, and the cylinder bottom end of the inner cylinder (2) is provided with a second air inlet; A non-return structure (3) is arranged in the outer cylinder (1) and extends from the bottom of the outer cylinder (1) to the bottom of the inner cylinder (2). One end of the non-return structure (3) is arranged on the bottom of the outer cylinder (1) and is connected to the first air inlet, and the other end is blocked by a gap at the bottom end of the inner cylinder (2) and is connected to the second air inlet.

2. The clothes dryer according to claim 1, characterized in that: An auxiliary structure (21) having a concave cavity is provided on the outer wall of the bottom of the inner cylinder (2), which is shielded from the anti-return structure (3) by a gap, and the second air inlet is arranged in the auxiliary structure (21).

3. The clothes dryer according to claim 2, characterized in that: The anti-return structure (3) is in the shape of a cylinder, and the outer wall of the bottom of the inner cylinder (2) is recessed inward to form the auxiliary structure (21); The other end of the anti-return structure (3) is shielded by a gap between the inner circumference of the auxiliary structure (21), and the second air inlet is arranged on the bottom wall of the auxiliary structure (21).

4. The clothes dryer according to claim 3, characterized in that: The anti-return structure (3) is an elastic structure; Preferably, the outer peripheral wall at the other end of the anti-return structure (3) is provided with a contact portion (32), which is arranged close to the peripheral wall of the auxiliary structure (21).

5. The clothes dryer according to claim 4, characterized in that: The anti-return structure (3) comprises a plurality of connecting pieces (31), wherein the connecting pieces (31) extend from the bottom of the outer cylinder (1) to the bottom end of the inner cylinder (2), and the plurality of connecting pieces (31) are arranged in sequence along the circumferential direction to form a cylindrical shape.

6. The clothes dryer according to claim 4, characterized in that: The projection of the anti-return structure (3) on the bottom of the outer cylinder (1) at least partially covers the first air inlet.

7. The clothes dryer according to any one of claims 3 to 6, characterized in that: The other end of the non-return structure (3) is arranged close to the bottom wall of the auxiliary structure (21) and is located at the periphery of the second air inlet.

8. The clothes dryer according to claim 7, characterized in that: The outer diameter of the non-return structure (3) decreases along the direction of wind flow, the inner diameter of the auxiliary structure (21) decreases along the direction of wind flow, and the rate of change of the inner diameter of the auxiliary structure (21) is greater than the rate of change of the outer diameter of the non-return structure (3).

9. The clothes dryer according to claim 7, characterized in that: The auxiliary structure (21) comprises a circular bottom wall (211) and an annular side wall (212), wherein the circular bottom wall (211) is coaxially arranged with the inner cylinder (2); The annular side wall (212) comprises a first peripheral wall segment, a second peripheral wall segment and a third peripheral wall segment which are sequentially connected along the axial direction; The first circumferential wall section is connected to the outer peripheral edge of the circular bottom wall (211), the inner diameter of the first circumferential wall section is smaller than the inner diameter of the third circumferential wall section, and the other end of the non-return structure (3) is arranged in the first circumferential wall section.

10. The clothes dryer according to any one of claims 3 to 6, characterized in that: It also comprises a box body (4), the outer cylinder (1) is arranged in the box body (4), and a third air inlet is arranged on the rear side wall of the box body (4) and is arranged in communication with the first air inlet; The air outlet of the drying air duct is arranged on the outer wall of the rear side wall of the box body (4), and the air outlet of the drying air duct is connected to the third air inlet; Preferably, the bottom of the outer cylinder (1) is integrally arranged with the rear side wall of the box body (4).

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