TWI710683B - Drum washing machine and drum dryer - Google Patents

Abstract

The present invention is provided with: a water tank, a rotating drum rotatably supported in the water tank, and a cover provided on the back of the rotating drum, and a mesh filter is formed on the cover, and the mesh filter is directed toward the rotating drum The back side is convexly formed. With this configuration, the concave-convex shape of the mesh filter with respect to the inner surface of the rotating drum can be formed larger, so that the stirring force for clothes and the like can be improved, and the washing efficiency and drying efficiency can be improved. In addition, by making the mesh filter protrude from the back side of the rotating drum, the internal volume of the rotating drum can be increased.

Description

Drum washing machine and drum dryer

FIELD OF THE INVENTION The present invention relates to a drum-type washing machine and a drum-type dryer, and more particularly to a drum-type washing machine and a drum-type dryer with a rotating drum with the bottom facing the back in a sink.

Background of the Invention Fig. 7 schematically shows the whole of a conventional drum-type washer-dryer in which a drum-type washing machine and a drum-type dryer are integrated as disclosed in JP 2010-12090 A. As shown in the figure, in the washing machine body 101, the water tank 102 is elastically supported by a buffer member not shown. In the water tank 102, a bottomed cylindrical rotating drum 103 is rotatably supported. In the rotating drum 103, a rotating shaft 105 is arranged from the front side of the rotating drum 103 toward the back side which becomes the bottom surface. The shaft 105 is arranged so as to be horizontal or inclined downward while being rotatably supported by the bearing portion 111. On the back of the water tank 102, a motor 104 that drives the rotating shaft 105 to rotate the rotating drum 103 is arranged.

The water tank 102 is provided with a circulating air passage 109 that circulates the air in the water tank 102, and is configured to repeatedly dehumidify the air in the water tank 102 by the blower fan 107, and then heat it, and blow the air through the air outlet 108 To the step in the water tank 102, the clothes etc. in the rotating drum 103 are dried. In addition, it is known that a resin cover is installed inside the rotating drum 103 of the air outlet 108 to prevent clothing and the like from entering the air outlet 108.

In the conventional cover, although a mesh filter that allows the air from the blower port 108 to pass through has been installed, the mesh filter is formed on the same surface as the front side of the bottom of the rotating drum 103, and one side is together with the rotating drum 103 While rotating, the blowing air from the blowing port 108 is dispersed and passed, so that the blowing air is evenly introduced into the large area in the rotating drum 103 to improve the drying efficiency and avoid uneven drying.

SUMMARY OF THE INVENTION However, since the bottom of the conventional rotating drum and the cover are formed on the same surface, they are formed in a smooth shape without unevenness, and have no resistance to the laundry, and are effective in terms of washing power or washing/cleaning power. The stirring action of the drying clothes is not helpful. In addition, since the bottom of the rotating drum and the cover are on the same surface, the laundry is easy to stick to and difficult to move, and there are problems in that the air is easily blocked for drying and cannot be sent into the rotating drum.

The present invention provides a drum type washing machine and drum type dryer capable of improving washing efficiency or drying efficiency.

The drum-type washing machine and the drum-type dryer of the present invention are provided with a water tank, a rotating drum rotatably supported in the water tank, and a cover arranged on the back of the rotating drum. In addition, a mesh filter is formed in the lid, and the mesh filter is formed to protrude toward the back side of the rotating drum. With this structure, it becomes feasible to improve the washing efficiency or drying efficiency.

In addition, in the mesh filter of the conventional drum dryer, the through holes that allow the air from the blower to pass are already formed, but because the through holes are almost uniformly formed in the entire mesh filter, there are There is a concern that air will be dispersed in the rotating drum to suppress drying efficiency.

The invention provides a drum type washing and drying machine capable of improving drying efficiency.

The drum dryer of the present invention is provided with a water tank, a rotating drum rotatably supported in the water tank, a cover arranged on the back of the rotating drum, and a circulating air passage for circulating air in the water tank. In addition, a mesh filter is formed in the cover, and a through hole is formed in the mesh filter to allow air from the circulating air passage to pass, and the opening area of the through hole in the center part of the mesh filter is formed to be larger than that of the outer peripheral part. The opening area of the through hole is still large.

With this structure, the air volume can be increased in the central part of the mesh filter, and air can be effectively supplied to clothes, etc., and the drying efficiency can be improved.

Modes for Implementing the Invention Hereinafter, with reference to the drawings, an exemplary drum-type washer-dryer in which a drum-type washing machine and a drum-type dryer are integrated is described. In addition, the terms "up", "down", "left", or "right" used in the following description to indicate directions are only for the purpose of making the description clear. Therefore, these terms are not intended to limit the principles of washing machines in any way. In addition, the following description is a specific example of the present invention, and is not intended to limit the description of the application scope. (First Embodiment)

The drum-type washing and drying machine of the present embodiment has the same basic structure as the conventional one, and the same parts as those in the conventional art will be given the same reference numerals and description thereof will be omitted.

As shown in Figures 1 to 4, on the back of the rotating drum 103, there is a metal shaft connecting support member 1, and in the central part of the shaft connecting support member 1, there is a shaft support portion 1a connected to the rotating shaft 105, and the rotating shaft 105 is rotatably supported by the bearing 111 formed in the water tank 102. The shaft connection support member 1 is provided with a plurality of extension portions 1b extending in the radial direction from the center portion, the extension portion 1b connects the shaft support portion 1a and the outer peripheral portion 1c, and a loop is formed between the plurality of extension portions 1b provided The air outlet 108 of the wind path 109.

Moreover, the shaft connection support member 1 is formed so that it may protrude toward the inside of the rotating drum 103 as it changes from the outer peripheral part 1c to the shaft support part 1a.

The surface of the shaft connection support member 1 is covered with a covering member 2 made of synthetic resin. In this embodiment, it is formed by insert molding. The covering member 2 includes a central covering portion 2a covering the shaft support portion 1a, an extended covering portion 2b covering the extended portion 1b, and an outer peripheral covering portion 2c covering the outer peripheral portion 1c.

Inside the rotating drum 103 of the extended coating part 2b, the synthetic resin covering member 4 which covers the extended coating part 2b is installed. The covering member 4 covers the central covering portion 2a and the outer circumferential covering portion 2c, and covers the inside of the rotating drum 103 on which the covering portion 2b is extended so that it becomes a smooth curved surface from the central covering portion 2a to the outer circumferential covering portion 2c.

In this embodiment, the covering member 2 and the covering member 4 constitute a lid.

Furthermore, in the covering member 2, a mesh filter 3 is integrally formed between the extended covering portions 2 b, and the mesh filter 3 prevents foreign matter from entering the circulating air passage 109. The mesh filter 3 is formed in plural places of the cover.

As shown in FIG. 3, in the mesh filter 3, the convex part 3a which protrudes toward the back side of the rotating drum 103 is formed in the center part of the mesh filter 3. The portion of the mesh filter 3 extending from the extended coating portion 2b side forms a first inclined surface 3b, which becomes a steep slope and covers the side surface of the extended coating portion 2b. The portion of the mesh filter 3 extending from the outer circumferential covering portion 2c forms a second inclined surface 3c, which is inclined more gently than the first inclined surface 3b extending from the extending covering portion 2b. The portion of the mesh filter 3 extending from the central covering portion 2a forms a third inclined surface 3d which is formed as a gentler inclined surface than the first inclined surface 3b and the second inclined surface 3c, And formed into the gentlest slope.

The convex part 3a of the mesh filter 3 has a center part which protrudes most toward the back side of the rotating drum 103, and the flat surface 3e formed in a substantially flat shape is formed in the center part. As shown in FIGS. 5 and 6, the mesh filter 3 has through holes 5b, 5c, 5d, and 5e formed in the first inclined surface 3b, the second inclined surface 3c, the third inclined surface 3d, and the flat surface 3e, respectively. The through holes 5b, 5c, and 5d formed in the first inclined surface 3b, the second inclined surface 3c, and the third inclined surface 3d have substantially the same width in the radial direction. The through hole 5e of the flat surface 3e is formed by forming the width dimension a in the radial direction to be larger than the width in the radial direction of the through holes 5b, 5c, and 5d formed on the first inclined surface 3b, the second inclined surface 3c, and the third inclined surface 3d The size b is also large, and the opening area of the through hole 5e is larger than the opening area of the through holes 5b, 5c, and 5d. In this embodiment, the through hole 5ce of the second inclined surface 3c close to the flat surface 3e is formed to be wider in the radial direction than the through holes 5c of other parts, and is formed to be the same as the through hole 5e of the flat surface 3e The width dimension a in the radial direction has a larger opening area.

Since the mesh filter 3 is formed by forming the opening area of the through hole 5e of the flat surface 3e of the central part to be larger than the opening area of the other through holes 5b, 5c, 5d, the central part of the mesh filter 3 can be increased The air volume, the effective supply of air to clothes, etc., and the improvement of drying efficiency will become feasible.

The flat surface 3e of the mesh filter 3 is formed to be inclined so as to move closer to the inner surface side of the rotating drum 103 as it moves closer to the central covering portion 2a. The inclination of the flat surface 3e is formed to be substantially parallel to the inclination of the covering member 4. The reference plane of the covering member 2 is defined as a plane perpendicular to the rotation axis 105, and the ribs 6 defining the through holes 5b, 5c, 5d, and 5e are formed substantially perpendicular to the reference plane. In other words, the rib 6 is formed to be substantially parallel to the rotating shaft 105. By slanting the flat surface 3e so as to be close to the inner surface of the rotating drum 103, the air passing through the through holes 5e diffuses toward the outer circumference of the rotating drum 103. Thereby, in the drying step, it becomes possible to efficiently blow air to the clothes and the like concentrated on the inner and outer peripheral sides of the rotating drum 103, and the drying efficiency can be improved. The through hole 5c of the second inclined surface 3c located on the outer peripheral side of the mesh filter 3 is formed to have a small opening area, so it is possible to suppress the tackling of clothes and the like concentrated on the inner and outer peripheral sides of the rotating drum 103 Become feasible.

Set the amount of protrusion of the central covering portion 2a of the covering member 2 to the outer peripheral covering portion 2c as A (refer to FIGS. 3 and 4), and set the flat surface 3e of the mesh filter 3 toward the back side of the rotating drum 103 of the covering member 4 The protrusion amount of is set to B (refer to FIG. 3), and the protrusion amount B is set to be larger than the protrusion amount A. With this structure, the concave-convex shape of the mesh filter 3 relative to the inner surface of the rotating drum 103 can be formed to be large, and when the rotating drum 103 rotates, the stirring power for clothes etc. is increased, and the operation of the clothes etc. is activated. , Thereby can improve the washing efficiency and drying efficiency. In addition, by making the protruding portion 3a of the mesh filter 3 protrude from the back side of the rotating drum 103, it becomes possible to increase the internal volume of the rotating drum 103.

In the covering member 2, a plurality of annular ribs 7b are formed on the outer peripheral side than the mesh filter 3, and these annular ribs 7b will be together with the plurality of water tank side annular ribs 7a formed toward the water tank 102 side Form a labyrinth structure 7. In the mesh filter 3, the distance between the protruding portion 3a and the outer peripheral edge of the rotating drum 103 of the blower port 108 is formed to be narrower than the distance between the labyrinth structure 7 and the outer peripheral edge of the rotating drum of the blower 108. Thereby, the loss of the air volume from the air blowing port 108 can be reduced, and the drying efficiency can be improved.

As described above, the drum-type washing machine of the first invention is a type that includes a sink, a rotating drum rotatably supported in the sink, and a cover arranged on the back of the rotating drum, and a mesh is formed in the cover Filter, and a drum-type washing machine formed by projecting a mesh filter toward the back side of the rotating drum.

With this configuration, the concave-convex shape of the mesh filter with respect to the inner surface of the rotating drum can be formed to be large, and when the rotating drum rotates, the stirring force for clothes etc. is increased, and the movement of the clothes etc. is activated. And can improve the cleaning efficiency. Furthermore, by making the mesh filter protrude from the back side of the rotating drum, it becomes possible to increase the internal volume of the rotating drum.

In addition, the second invention is the drum-type washing machine of the first invention, wherein the rotating drum is provided with a shaft connection support member connecting the bearing portion and the outer peripheral portion on the back side, and the cover is provided with the inner surface of the rotating drum covering the shaft connection support member The covering part of the cover is formed to protrude from the inner surface of the rotating drum in the radial direction of the cover, and the protrusion of the protrusion is formed to be larger than the protrusion of the outer shape of the central part of the cover.

With this configuration, the concave-convex shape of the mesh filter with respect to the inner surface of the rotating drum can be formed to be large, and when the rotating drum rotates, the stirring force for clothes etc. is increased, and the movement of the clothes etc. is activated. And can improve the cleaning efficiency. Furthermore, by making the mesh filter protrude from the back side of the rotating drum, it becomes possible to increase the internal volume of the rotating drum.

In addition, the drum dryer of the third invention is provided with: a water tank, a rotating drum rotatably supported in the water tank, a circulating air passage that circulates the air in the water tank, and is arranged on the back of the rotating drum and covered A drum dryer formed by forming a mesh filter on the cover of the air outlet of the circulating air path and projecting the mesh filter toward the back side of the rotating drum.

With this configuration, the concave-convex shape of the mesh filter with respect to the inner surface of the rotating drum can be formed to be large, and when the rotating drum rotates, the stirring force for clothes etc. is increased, and the movement of the clothes etc. is activated. And can improve drying efficiency. Furthermore, by making the mesh filter protrude from the back side of the rotating drum, it becomes possible to increase the internal volume of the rotating drum.

In addition, the fourth invention is the drum dryer of the third invention, wherein the rotating drum is provided with a shaft connection support member connecting the bearing portion and the outer peripheral portion on the back, and the cover is provided with the inner surface of the rotating drum covering the shaft connection support member On the side covering part, the radial center part of the cover body is formed to protrude on the inner surface of the rotating drum, and the protrusion amount of the protrusion part is formed to be larger than the protrusion amount of the outer shape part of the center part of the cover body.

With this configuration, the concave-convex shape of the mesh filter with respect to the inner surface of the rotating drum can be formed to be large, and when the rotating drum rotates, the stirring force for clothes etc. is increased, and the movement of the clothes etc. is activated. And can improve drying efficiency. Furthermore, by making the mesh filter protrude from the back side of the rotating drum, it becomes possible to increase the internal volume of the rotating drum.

In addition, the fifth invention is the drum dryer of the third invention or the drum dryer of the fourth invention, wherein the cover is arranged so as to cover the air outlet formed on the back of the rotating drum, and the cover is The protruding portion of the cover forms a substantially flat flat portion, and at least the flat portion of the cover body is formed with a through hole through which the air passing through the blower can circulate.

With this structure, the air volume can be increased in the central part of the mesh filter, and air can be effectively supplied to clothes, etc., and the drying efficiency can be improved.

In addition, the sixth invention is the drum dryer of the fifth invention, in which the flat portion formed on the convex portion of the cover body can be formed so as to rotate closer to the center of the rotating drum. The inner side of the drum.

In addition, by inclining the flat surface so as to be close to the inner surface of the rotating drum, the air passing through the through holes will diffuse toward the outer circumference of the rotating drum. Thereby, in the drying step, it becomes possible to efficiently blow air to the clothes and the like concentrated on the inner and outer peripheral sides of the rotating drum, and the drying efficiency can be improved.

In addition, the seventh invention is the drum dryer of the fifth invention, which can be configured to form a labyrinth structure between the outer peripheral portion of the cover and the water tank, and between the outer peripheral side of the protrusion of the cover and the air outlet The distance on the inner circumferential side is formed to be smaller than the distance between the inner circumferential side of the labyrinth structure and the inner circumferential side of the air outlet.

With this structure, the loss of the air volume from the air outlet can be reduced, and the drying efficiency can be improved.

In addition, the drum dryer of the eighth invention is a drum dryer provided with a water tank, a rotating drum that is rotatably supported in the water tank, a cover provided on the back of the rotating drum, and a circulating air passage for circulating air in the water tank . In addition, a mesh filter is formed in the cover, and a through hole is formed in the mesh filter to allow air from the circulating air passage to pass, and the opening area of the through hole in the center part of the mesh filter is formed to be larger than that of the outer peripheral part. A drum dryer with a large opening area of the through hole.

With this structure, the air volume can be increased in the central part of the mesh filter, and air can be effectively supplied to clothes, etc., and the drying efficiency can be improved.

In addition, the ninth invention is the drum dryer of the eighth invention, which may be configured to project the mesh filter toward the back side of the rotating drum.

With this configuration, the concave-convex shape of the mesh filter with respect to the inner surface of the rotating drum can be formed to be large, and when the rotating drum rotates, the stirring force for clothes etc. is increased, and the movement of the clothes etc. is activated. And can improve drying efficiency. Furthermore, by making the mesh filter protrude from the back side of the rotating drum, it becomes possible to increase the internal volume of the rotating drum.

Furthermore, in the tenth invention, in the drum dryer of the eighth invention or the drum dryer of the ninth invention, the through hole may be formed so as to guide the air from the circulating air passage in the outer circumferential direction of the water tank. With such a configuration, air is effectively supplied to clothes and the like, and drying efficiency can be improved.

In addition, the eleventh invention is in any one of the drum dryer of the eighth invention to the drum dryer of the tenth invention, and the cover may be configured to cover the circulating air formed on the back of the rotating drum In the air outlet of the road, a flat portion formed substantially flat is formed on the protruding part of the cover body, and at least the flat portion of the cover body is formed with a through hole through which the air passing through the air outlet can circulate.

With this structure, the air volume can be increased in the central part of the mesh filter, and air can be effectively supplied to clothes, etc., and the drying efficiency can be improved.

The twelfth invention, in any one of the drum dryer of the eighth invention to the drum dryer of the eleventh invention, can be configured to form a substantially flat flat portion on the convex portion of the cover, and The portion is formed so as to move closer to the inner surface of the rotating drum as it moves closer to the center of the rotating drum.

In addition, by inclining the flat surface so as to be close to the inner surface of the rotating drum, the air passing through the through holes will diffuse toward the outer circumference of the rotating drum. Thereby, in the drying step, it becomes possible to efficiently blow air to the clothes and the like concentrated on the inner and outer peripheral sides of the rotating drum, and the drying efficiency can be improved.

As described above, the drum-type washing machine and drum-type dryer of the present invention can improve washing efficiency or drying efficiency, and can also be used in drum-type washing and drying machines.

1‧‧‧Shaft connection support member 1a‧‧‧Shaft support 1b‧‧‧Extension Department 1c‧‧‧peripheral part 2‧‧‧Coated component 2a‧‧‧Central Covered Department 2b‧‧‧Extended covered department 2c‧‧‧peripheral covered part 3‧‧‧Mesh filter 3a‧‧‧Protrusion 3b‧‧‧The first inclined plane 3c‧‧‧The second inclined plane 3d‧‧‧The third inclined plane 3e‧‧‧flat surface 4‧‧‧Cover member 5b‧‧‧Through hole 5c‧‧‧Through hole 5ce‧‧‧Through hole 5d‧‧‧Through hole 5e‧‧‧Through hole 6‧‧‧rib 7‧‧‧Labyrinth structure 7a‧‧‧Annular rib on the side of the sink 7b‧‧‧Annular rib 101‧‧‧Washing machine body 102‧‧‧Sink 103‧‧‧Rotating drum 104‧‧‧Motor 105‧‧‧Rotation axis 107‧‧‧Supply fan 108‧‧‧Air supply outlet 109‧‧‧Circulating wind path 111‧‧‧Bearing Department a, b‧‧‧Width dimension A, B‧‧‧Outstanding amount

Fig. 1 is a cross-sectional perspective view of a rotary drum of a drum-type washing and drying machine in which a drum-type washing machine and a drum-type dryer are integrated in a first embodiment of the present invention.

2 is a cross-sectional perspective view of a main part of a rotary drum of a drum-type washing and drying machine in which a drum-type washing machine and a drum-type dryer are integrated according to the first embodiment of the present invention.

Fig. 3 is a cross-sectional view of the main part of the water tank and the rotating drum of the drum-type washer-dryer in which the drum-type washing machine and the drum-type dryer are integrated in the first embodiment of the present invention.

4 is a cross-sectional view of the main parts of the drum-type washer-dryer in which the drum-type washing machine and the drum-type dryer are integrated according to the first embodiment of the present invention when viewed from another direction.

Fig. 5 is a plan view of the mesh filter constituting the cover of the drum-type washing and drying machine in which the drum-type washing machine and the drum-type dryer are integrated in the first embodiment of the present invention.

Fig. 6 is a sectional view taken along line 6-6 in Fig. 5.

Fig. 7 is a cross-sectional view of a conventional drum-type washing and drying machine.

1a‧‧‧Shaft support

2a‧‧‧Central Covered Department

3‧‧‧Mesh filter

3a‧‧‧Protrusion

3b‧‧‧The first inclined plane

3c‧‧‧The second inclined plane

3d‧‧‧The third inclined plane

3e‧‧‧flat surface

4‧‧‧Cover member

7‧‧‧Labyrinth structure

7a‧‧‧Annular rib on the side of the sink

7b‧‧‧Annular rib

102‧‧‧Sink

103‧‧‧Rotating drum

105‧‧‧Rotation axis

108‧‧‧Air supply outlet

109‧‧‧Circulating wind path

111‧‧‧Bearing Department

A, B‧‧‧Outstanding amount

Claims (10)

A drum-type washing machine, comprising: a water tank, a rotating drum rotatably supported in the water tank, and a cover arranged on the back of the rotating drum, and a mesh filter is formed on the cover , And the mesh filter is formed to protrude toward the back side of the rotating drum, the rotating drum is provided with a shaft connecting support member connecting a bearing portion and an outer peripheral portion on the back, and the cover is provided with the rotating shaft covering the shaft connecting support member The covering part on the inner surface of the drum is formed by projecting the radial center part of the cover on the inner surface of the rotating drum, and the protrusion of the projecting part is formed to be larger than the outer shape of the central part of the cover The protruding amount is still large. A drum dryer, characterized by comprising: a water tank, a rotating drum rotatably supported in the water tank, a circulating air passage for circulating air in the water tank, and a back surface of the rotating drum. Cover the cover of the air outlet of the circulation air passage, and form a mesh filter on the cover, and the mesh filter is formed to protrude toward the back side of the rotating drum, and the rotating drum is provided with a connecting bearing part on the back A shaft-connected support member with an outer peripheral portion, the cover body is provided with a covering portion covering the inner surface of the rotating drum of the shaft-connected support member, and the radial center portion of the cover body is formed to protrude on the inner surface side of the rotating drum , And the protrusion amount of the protruding portion is formed to be larger than the protrusion amount of the outer shape part of the central part of the cover body. The drum dryer of claim 2, wherein the cover body is arranged to cover the air blowing port formed on the back of the rotating drum, and a substantially flat flat part is formed on the convex part of the cover body, and At least the flat portion of the cover body is formed with a through hole through which the air passing through the air blowing port can circulate. The drum dryer of claim 3, wherein a substantially flat flat portion is formed on the convex portion of the cover, and the flat portion is formed so as to move closer to the center of the rotating drum To the inner surface side of the aforementioned rotating drum. The drum dryer of claim 4, wherein in the cover, a labyrinth structure is formed between the outer peripheral portion and the water tank, and the outer peripheral side of the protruding portion of the cover and the inside of the air outlet The distance on the circumferential side is formed to be smaller than the distance between the inner circumferential side of the labyrinth structure and the inner circumferential side of the air outlet. A drum type dryer, characterized by comprising: a water tank, a rotating drum rotatably supported in the water tank, a cover arranged on the back of the rotating drum, and circulating air for circulating air in the water tank And form a mesh filter in the cover body, and form a through hole in the mesh filter that allows air from the circulation air path to pass, and open the through hole in the central part of the mesh filter The area is formed to be larger than the opening area of the through hole in the outer peripheral part, and the cover is arranged to cover the air outlet of the circulating air passage formed on the back of the rotating drum, and is formed on the convex part of the cover approximately A flat portion is formed flat, and at least the flat portion of the cover body is formed with a through hole through which the air passing through the air blower can circulate. A drum type dryer, characterized by comprising: a water tank, a rotating drum rotatably supported in the water tank, a cover arranged on the back of the rotating drum, and circulating air for circulating air in the water tank And form a mesh filter in the cover body, and form a through hole in the mesh filter that allows air from the circulation air path to pass, and open the through hole in the central part of the mesh filter The area is formed to be larger than the opening area of the through hole in the outer peripheral part, and a flat portion formed substantially flat is formed on the convex portion of the cover body, and the flat portion is formed as it moves closer to the center of the rotating drum The part will be closer to the inner surface side of the aforementioned rotating drum. The drum dryer of claim 6 or 7, wherein the mesh filter is formed to protrude toward the back side of the rotating drum. The drum dryer of claim 6 or 7, wherein the through hole is formed to be able to guide the air from the circulating air path to the outer circumference of the water tank. The drum dryer of claim 8, wherein the through hole is formed to be able to guide the air from the circulating air path to the outer circumference of the water tank.

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