JP3544876B2 - Drum type washing machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a drum type washing machine having a drum which is rotated substantially horizontally in a water tub so that washing to drying can be performed.
[0002]
[Problems to be solved by the invention]
As a drum type washing machine of this type, one having the configuration shown in FIG. 8 has been considered. This will be described. A laundry doorway 2 is formed on the front surface of the outer case 1, and a cylindrical water tub 3 having an opening 3a on the front surface is supported inside the outer case 1 via a vibration damping mechanism. . Inside the water tank 3, a drum 4 having an opening 4a on the front surface and a large number of holes 4b on the peripheral wall is provided rotatably about a horizontal axis by a bearing mechanism 5 at the rear. The drum 4 is directly driven by a direct drive type motor 6.
[0003]
A support 4c is intermittently provided on the back surface of the drum 4, and a back plate 4e having a hole 4d is provided on the support 4c. A hot air return port 3 b is formed in the back plate of the water tank 3. The laundry doorway 2 of the outer box 1 and the front opening 3a of the water tub 3 are connected by a connecting member 7 made of an elastic material. The connecting member 7 has a fitting opening 7a. .
[0004]
One end of a heat exchanger 8 is connected to the hot air return port 3b, and the other end of the heat exchanger 8 is connected to one end of a hot air supply device 11 including a blower 9 and a heater 10. (The blower 9 side) is connected. The heater 10 side of the hot air supply device 11 is fitted and connected to the fitting port 7a via a duct 10a, and the opening of the duct 10a is a hot air supply port 12. In this apparatus, during the drying operation, the drum 4 is rotated, the blower 9 is operated, and the heater 10 is energized and generates heat. As shown by the arrow P, the air in the drum 4 is sucked from the hot air return port 3b by the blower 10, and passes through the heat exchanger 8, the blower 9, and the heater 10. At this time, the air is heated by the heater 10, discharged from the hot air supply port 12 into the connection member 7, and supplied into the drum 4 through the front opening 3 a of the water tank 3 and the front opening 4 a of the drum 4. . The laundry (dry material) in the drum 4 is conveyed to the heat exchanger 8 through the hole 4d and the hot air return port 3b, contributing to drying of the laundry (dry material). This heat exchanger 8 dehumidifies the warm air. Then, the supply to the hot air supply device 11 is repeated. Thus, the laundry in the drum 4 is dried.
[0005]
By the way, it is generally known that vibration is likely to occur in a drum type washing machine at the time of washing and dehydration, and the same applies to the drum type washing machine shown in FIG. In order to suppress this vibration, a weight having a considerable weight is attached to the water tank 3 or the like. However, this increases the weight of the entire washing machine.
[0006]
As a countermeasure, the present inventor has considered that a balance ring 13 is attached to the peripheral wall portion of the drum 4 as shown in FIG. 9 to thereby suppress vibration and reduce the weight. The mounting position of the balance ring 13 is preferably a peripheral wall near the opening 4a of the drum 4 as shown in FIG.
[0007]
By the way, in the case of this type of drum type washing machine, the hot air (which is a high temperature) discharged from the hot air supply port 11 mostly flows as indicated by the arrow P as described above. Some of them may flow between the opening edge of the drum 4 and the opening edge of the water tank 3 before flowing into the drum 4 as shown by an arrow P '. Therefore, the balance ring 13 may be directly heated. As a result, the balance ring 13 may be thermally degraded over time. In particular, when the balance ring 13 is configured as a liquid-filled type, the internal liquid expands to increase the internal pressure, the degree of deterioration is large, and it is necessary to pay sufficient attention to material selection and molding. Incidentally, the warm air also contacts the balance ring 13 in the drum 4, but in this case, the washing is agitated in the drum 4 and the warm air exchanges heat with the laundry to lower the temperature. The heat load applied to the balance ring 13 is reduced, and the balance ring 13 is less deteriorated.
[0008]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a drum type washing machine capable of suppressing deterioration of a balance ring while suppressing vibration and reducing weight.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 is a water tank supported in an outer box and having an opening in a front plate portion,
A cylindrical drum provided rotatably about a substantially horizontal axis in the water tank and having an opening in a front plate portion;
A balance ring provided on a portion of the peripheral wall portion of the drum on the front plate portion side ,
A hot air supply unit that includes a hot air supply unit near the front opening of the water tank and supplies hot air into the drum from the hot air supply unit through the opening of the water tank and the opening of the drum;
An annular first seal wall portion provided on the front plate portion of the drum at a position closer to the hot air supply portion than the balance ring;
A maze-like shape is provided on the front plate portion of the water tank so as to be located closer to the hot air supply portion than the balance ring and close to the first seal wall portion. And an annular second seal wall constituting a seal portion.
[0010]
In the above configuration, since the balance ring is provided on the peripheral wall of the drum, the vibration can be suppressed without increasing the overall weight. Moreover, an annular first seal wall is provided on the front plate portion of the drum closer to the hot air supply unit than the balance ring, and the front plate portion of the water tank is closer to the hot air supply unit than the balance ring. And an annular second seal wall is provided so as to approach the first seal wall, and the first seal wall and the second seal wall constitute a maze-shaped seal. Therefore, of the space between the drum and the water tank, the space leading from the hot air supply unit to the balance ring portion is sealed by the maze-shaped seal portion, and the balance ring becomes excessively hot. In other words, the deterioration of the balance ring can be suppressed.
[0011]
The invention according to claim 2 is that at least one of the front plate portion of the drum and the front plate portion of the water tank is made of a metal plate,
The sealing wall in the front plate portion of the drum or the front plate portion of the water tank, which is made of a metal plate, is characterized in that it has a convex shape and is integrally formed by squeezing.
[0012]
The drum or the water tank is often made of a metal plate, and accordingly, each front plate portion is often made of a metal plate. In this case, the seal wall portion (the first seal wall portion in the case of the drum and the second seal wall portion in the case of the water tank) may be formed in a convex shape. At this time, since the seal wall portion is integrally formed by drawing, the productivity is improved as compared with the case where the seal wall portion is formed by another member.
[0013]
According to a third aspect of the present invention, one of the first seal wall and the second seal wall has a convex shape, and the other has a concave shape which fits in a non-contact state with the convex seal wall. It has features.
In this configuration, the degree of maze of the seal portion formed by the first seal wall portion and the second seal wall portion becomes more complicated, the sealing effect is improved, and the deterioration of the balance ring is more effectively prevented. become able to.
[0014]
The invention according to claim 4 is that at least one of the front plate portion of the drum and the front plate portion of the water tank is made of plastic,
The sealing wall in the front plate of the drum or the front plate of the water tank, which is made of plastic, is characterized by being integrally formed in a rib shape.
The drum or the front plate of the aquarium may be made of plastic. In this case, since the seal wall (the first seal wall in the case of the drum and the second seal wall in the case of the water tank) is integrally formed into a rib shape, the seal wall is formed by a separate member. In this case, the productivity is better and the strength is improved.
[0015]
The invention according to claim 5 is characterized in that an outer box having a laundry doorway formed in a front plate portion,
A water tank supported in the outer box and having an opening formed in the front plate portion,
A connection member made of an elastic material that connects the laundry entrance and exit of the outer box so as to communicate with the opening of the water tub;
A cylindrical drum provided in the water tank so as to be rotatable about a substantially horizontal axis and having an opening in a front plate portion,
A balance ring provided on a portion of the peripheral wall portion of the drum on the front plate portion side ,
A hot-air supply device that includes a hot-air supply unit in the connection member, and supplies hot air into the drum from the hot-air supply unit through the opening of the water tank and the opening of the drum;
An annular first seal wall portion formed on the front plate portion of the drum at a position closer to the warm air supply unit than the balance ring;
The connection member is provided so as to approach the first seal wall portion, and includes an annular second seal wall portion that forms a maze-shaped seal portion with the first seal wall portion. Things.
[0016]
In the above configuration, since the laundry doorway of the outer box and the opening of the water tub are connected to each other by a connecting member made of an elastic material, the vibration of the water tub side is not transmitted to the outer case while the connecting member is used. Hot air can be guided in the direction of the drum. In this case, since the seal portion seals between the water tank and the drum communicating from the hot air supply portion to the balance ring portion, it is possible to prevent the balance ring from becoming excessively hot as in the first aspect of the present invention. Further, since the second sealing wall portion is formed on the connecting member, the second sealing wall portion can also be elastically deformed, and the second sealing wall portion and the first sealing wall portion on the drum side are connected to each other. In the unlikely event of contact, the generation of loud noise and breakage can be prevented.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. The outer box 21 of the drum type washing machine shown in FIG. 1 has a rectangular box shape as a whole, and has a circular laundry entrance / exit 22a formed in a front plate portion 22 thereof. Inside the outer case 21, a cylindrical water tank 23 whose axial direction is directed in the front-rear direction is elastically supported by, for example, four sets (only two sets are shown) of suspensions 24 constituting a vibration damping mechanism. It is provided.
[0019]
The water tank 23 is configured by joining a body 25, a rear plate 26, and a front plate 27, each of which is formed of, for example, a metal plate. The front plate 27 has a circular opening 27a. Is formed. The opening 27a and the laundry entrance / exit 22a are connected so as to communicate with each other by a generally cylindrical connecting member 28 made of an elastic material, for example, rubber, which has a cylindrical shape as a whole. The laundry entrance 22a is opened and closed by a door 29.
[0020]
A drum 30 is rotatably provided inside the water tank 23. The drum 30 is configured by joining a body 31, a rear member 32, and a front plate 33, each of which is formed of a metal plate, for example. The rear member 32 is configured by attaching a back plate 32e having a hole 32d to a frame 32c having a center portion 32a and a crosspiece portion 32b extending radially from the center portion 32a. A large number of holes 31a are formed in the peripheral wall of the body 31. Further, a circular opening 33a is formed in the front plate 33.
[0021]
A balance ring 34 is attached to a portion of the drum 30 near the front side of the inner peripheral portion of the body portion 31, that is, as shown in FIG. 1, to a portion of the peripheral wall portion of the drum 30 near the front plate portion 33. ing. The balance ring 34 is configured by enclosing a liquid, for example, water in a ring case 34a having a rectangular cross section. In this case, a plurality of small chambers (not shown) communicating with each other are formed inside the ring case 34a, so that a balance effect is exerted when the drum 30 rotates.
[0022]
A drum shaft 35 is attached to the central portion 32a of the rear member 32 of the drum 30 so as to protrude rearward, and this is a bearing housing that is attached through the rear plate portion 26 of the water tank 23. 36 is rotatably supported via a bearing 37, and the drum 30 is rotatably provided.
[0023]
Further, the drum 30 is directly driven by an outer rotor type motor 38. That is, a rotor 39 having a permanent magnet is attached to the rear end of the drum shaft 35 so as to be integrally rotatable, and a stator core and a coil are mounted on the bearing housing 36 so as to be located inside the rotor 39. Is provided. Therefore, when the rotor 39 is rotated, the drum 30 is directly driven to rotate via the drum shaft 35.
[0024]
Next, the hot air supply device 41 with a heat exchanger will be described. That is, the hot air return port 42 is formed in the rear plate portion 26 of the water tank 23. One end of a heat exchanger 43 for exchanging heat between the outside air and the hot air is connected to the hot air return port 42, and the other end of the heat exchanger 43 is connected to the inside through a bellows-like connecting duct 44. Is connected to the suction side of a blower 45 having blower blades. The discharge side of the blower 45 is connected via a duct 46 to one end of a heating device 47 having a heater inside, and the other end of the heating device 47 is connected to one end of a duct 48.
[0025]
The other end of the duct 48 is fitted into a fitting opening 28 a formed in the connection member 28 and faces the connection member 28 as a hot air supply port 49 serving as a hot air supply unit. In such a hot air supply device 41, during the drying operation, the drum 30 is rotated, the fan of the blower 45 is operated, and the heater of the heating device 47 is energized and heated. As shown by the arrow A, the air in the drum 30 is sucked from the hole 32d and the hot air return port 42 by the blower 45, and passes through the heat exchanger 43, the blower 45, and the heating device 47. At this time, the air is warmed by the heating device 47 and is discharged into the connecting member 28 from the hot air supply port 49 and is supplied into the drum 30 through the opening 27a of the water tank 23 and the opening 33a of the drum 30. Then, the laundry (drying object) in the drum 30 is conveyed to the heat exchanger 43 through the hole 32 d and the hot air return port 42, contributing to drying of the laundry (drying object). This heat exchanger 43 dehumidifies the warm air. Thus, the laundry in the drum 4 is dried.
[0026]
During the drying operation, the laundry inlet / outlet 22a of the outer case 21 and the opening 27a of the water tub 23 are connected to each other by the connecting member 28 made of an elastic material, so that the vibration of the water tub 23 is transmitted to the outer case 21. This prevents the connection member 28 from guiding the warm air toward the inside of the drum 30.
[0027]
Now, a maze-shaped seal portion 50 is provided on the front plate portion 27 of the water tank 23 and the front plate portion 33 of the drum 30. As shown in FIG. 2, the seal portion 50 includes an annular first seal wall portion 51 and an annular second seal wall portion 52, and the first seal wall portion 51 includes a drum. A front plate 33 made of a metal plate 30 is formed into a convex shape having a U-shaped cross section by squeezing and forming the front plate 33. The second seal wall portion 52 is formed in a convex shape having a U-shaped cross section by squeezing and forming the front plate portion 27 on a front plate portion 27 made of a metal plate of the water tank 23. The first seal wall portion 51 and the second seal wall portion 52 are located closer to the hot air supply port 49 than the balance ring 34 and are close to each other, thereby forming a maze-like shape. A seal part 50 is formed.
[0028]
In the above configuration, since the balance ring 34 is provided on the peripheral wall of the drum 30, vibration can be suppressed without increasing the overall weight.
Here, during the drying operation, the air (warm air) in the drum 30 is, as shown by the arrow A, the hole 32d and the warm air return port 42, the heat exchanger 43, the blower 45, the heating device 47, the warm air, The process of returning to the hot air return port 42 through the supply port 49, the opening 27a of the water tank 23, the opening 33a of the drum 30, and the drum 30 is repeated. In this case, the warm air discharged from the warm air supply port 49 flows from between the front plate portion 33 of the drum 30 and the front plate portion 27 of the water tank 23 as shown by an arrow B in FIG. It is feared that the gas flows to the surface side, that is, to the balance ring 34 side.
[0029]
However, according to the present embodiment, of the space between the drum 30 and the water tank 23, the space leading from the hot air supply port 49 to the balance ring 34 is sealed by the maze-shaped seal portion 50. In addition, the balance ring 34 is not excessively heated, and the deterioration of the balance ring 34 can be suppressed. In this case, the temperature of the liquid inside the balance ring 34 rarely rises, and the internal pressure does not become excessively high. This can also suppress the deterioration of the balance ring 34.
In particular, according to the present embodiment, since the front plate portion 33 of the drum 30 and the front plate portion 27 of the water tank 23 are made of a metal plate, the seal wall portions 51 and 52 are integrally formed by drawing. Manufacturability is improved as compared with the case where the seal walls 51 and 52 are formed by separate members. That is, for example, when the first seal wall portion or the second seal wall portion made of a separate member such as a metal plate is provided on each front plate portion made of a metal plate, these seal wall portions are welded to each front plate portion. As a result, it takes time and effort to manufacture, but in the present embodiment, there is no such a problem as can be seen from the above.
[0030]
FIG. 3 shows a second embodiment of the present invention. In this embodiment, the configuration of the seal portion 61 is different from that of the first embodiment. That is, the first seal wall portion 62 is formed in a convex shape like the above-described first seal wall portion 51, but the second seal wall portion 63 is formed in a concave shape. That is, the second seal wall 63 is formed in a concave shape by forming the protrusions 63a and 63b apart from each other. Then, the first seal wall portion 62 is fitted into the concave second seal wall portion 63 in a non-contact state.
[0031]
According to this embodiment, the degree of maze of the seal portion 61 composed of the convex first seal wall portion 62 and the concave second seal wall portion 63 becomes more complicated, and the sealing effect is improved. Thus, the deterioration of the balance ring 34 can be more effectively prevented. Note that, in this case, the first seal wall 62 may have a concave shape, and the second seal wall 63 may have a convex shape.
[0032]
FIG. 4 shows a third embodiment of the present invention. This embodiment differs from the first embodiment in the following points. That is, the front plate 71 of the drum 30 is formed of plastic, and the front plate 72 of the water tank 23 is also formed of plastic. The configuration of the seal 73 is also different from that of the first embodiment. A first sealing wall 74 is formed integrally with the front plate 71 of the drum 30 in a rib shape, and a second sealing wall 75 is similarly formed on the front plate 72 of the water tank 23. It is integrally formed in a rib shape.
[0033]
In the third embodiment, the front plates 72 and 73 of the drum 30 and the water tank 23 are made of plastic. In this case, the sealing walls 74 and 75 are integrally formed in a rib shape. As compared with the case where the seal wall is formed by a separate member, the manufacturability is improved and the strength is improved. Further, when the seal walls 51 and 52 are formed by squeezing a metal plate as in the first embodiment, since the deep drawing is difficult, the protruding length of the seal walls 51 and 52 is difficult. However, in the case of the sealing walls 74 and 75 made of plastic ribs as described above, the protruding length of the sealing walls 74 and 75 can be increased by plastic molding. Region) can be increased, and the sealing performance is further improved.
[0034]
FIG. 5 shows a fourth embodiment of the present invention. In this embodiment, the configuration of the seal portion 81 is different from that of the third embodiment. That is, the first seal wall portion 82 of the seal portion 81 is formed in a convex shape on the front plate portion 72 similarly to the first seal wall portion 74 described above, but the second seal wall portion 83 is The connecting member 28 is formed in a rib shape at an end 28a on the water tank 23 side.
[0035]
According to this embodiment, since the second sealing wall portion 83 is formed on the connecting member 28, the second sealing wall portion 83 can also be elastically deformed. Even if the first seal wall portion 82 on the drum 30 side comes into contact with the first seal wall portion 82, it is possible to prevent generation of loud noise and breakage.
[0036]
FIG. 6 shows a fifth embodiment of the present invention. This embodiment differs from the third embodiment in the following points. That is, a ventilation portion 91 including a large number of holes is formed in the front plate portion 71 of the drum 30 at a position closer to the hot air supply port 48 than the seal portion 73.
According to this embodiment, the following effects can be obtained. That is, when the hot air from the hot air supply port 48 flows into the seal portion 73, a relatively large static pressure is required, but the hot air does not need a large static pressure to pass through the ventilation portion 91. Eventually, the warm air passes through the ventilation portion 91, and the sealing effect of the seal portion 73 is further improved.
[0037]
FIG. 7 shows a sixth embodiment of the present invention. In this embodiment, the configuration of the seal portion 101 is different from that of the third embodiment. The first seal wall 102 protrudes longer than the first seal wall 74 of the third embodiment, and the second seal wall 103 is in contact with the front plate 71 of the drum 30. Has a concave shape bulging to the opposite side. The first seal wall 102 is fitted into the second seal wall 103 in a non-contact manner.
[0038]
According to the sixth embodiment, the maze degree of the seal portion 101 is more complicated than that of the third embodiment, and the sealing effect is further improved. In this case, the first seal wall 102 may have a concave shape, and the second seal wall 103 may have a convex shape.
[0039]
In the above embodiment, the case where both the front plate portion of the drum and the front plate portion of the water tank are made of a metal plate, and the case where both are made of a plastic plate are illustrated. And the other may be made of plastic. Further, in each of the above-described embodiments, the dehumidifying circulation type is exemplified as the hot air supply device, but a type that discharges the exhausted hot air to the outside may be used.
[0040]
【The invention's effect】
As apparent from the above description, the present invention can obtain the following effects.
According to the first aspect of the invention, since the balance ring is provided on the peripheral wall of the drum, vibration can be suppressed without increasing the overall weight, and the balance ring is provided on the front plate of the drum. A first seal wall portion is provided on the hot air supply portion side, and a second seal wall portion that forms a maze-shaped seal portion with the first seal wall portion on the front plate portion of the water tank. Is provided, of the space between the drum and the water tank, the space leading to the balance ring portion is sealed by the maze-shaped seal portion, so that the balance ring can be prevented from being excessively heated, and the balance can be prevented. The deterioration of the ring can be suppressed.
[0041]
According to the invention of claim 2, in a configuration in which the front plate portion of the drum or the front plate portion of the water tank is made of metal, the seal wall portion is integrally formed by drawing, so that the seal wall portion is formed by another member. Manufacturability can be improved as compared with the case.
According to the third aspect of the present invention, one of the first seal wall and the second seal wall has a convex shape, and the other has a concave shape that fits in a non-contact state with the convex seal wall. As a result, the sealing effect is further improved.
[0042]
According to the fourth aspect of the present invention, since the sealing wall portion of the front plate portion of the drum or the front plate portion of the water tank, which is made of plastic, is integrally formed in a rib shape, the sealing wall portion is formed by another member. In this case, the productivity is improved, the strength is improved, and the sealing performance is improved.
According to the fifth aspect of the present invention, since the second sealing wall is formed on the connecting member made of the elastic material, the second sealing wall and the first sealing wall on the drum side are inevitable. even if such contact, it is possible to prevent generation of a large noise, damage also Ru prevented.

[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a main part showing a first embodiment of the present invention. FIG. 2 is a longitudinal side view of an entire drum type washing machine. FIG. 3 is equivalent to FIG. 1 showing a second embodiment of the present invention. FIG. 4 is a diagram corresponding to FIG. 1 showing a third embodiment of the present invention. FIG. 5 is a diagram corresponding to FIG. 1 showing a fourth embodiment of the present invention. FIG. 6 is a diagram showing a fifth embodiment of the present invention. 7 is a diagram corresponding to FIG. 1 showing a sixth embodiment of the present invention. FIG. 8 is a diagram corresponding to FIG. 2 showing a conventional example. FIG. 9 is a diagram corresponding to FIG. 2 showing a reference example. Description】
21 is an outer box, 22a is a laundry doorway, 23 is a water tub, 27 is a front plate, 27a is an opening, 28 is a connecting member, 30 is a drum, 33 is a front plate, 34 is a balance ring, 38 is a motor, 41 Is a hot air supply device, 42 is a hot air return port, 43 is a heat exchanger, 47 is a heating device, 49 is a hot air supply port (hot air supply portion), 50 is a seal portion, and 51 is a first seal wall portion. , 52 are a second seal wall, 61 is a seal, 62 is a first seal wall, 63 is a second seal wall, 71 is a front plate, 72 is a front plate, 73 is a seal, 74 is a first seal wall, 75 is a second seal wall, 81 is a seal, 82 is a first seal wall, 83 is a second seal, 91 is a vent, 101 is a seal, 102 denotes a first seal wall, and 103 denotes a second seal.

Claims (5)

A water tank supported in the outer box and having an opening in the front plate,
A cylindrical drum provided rotatably about a substantially horizontal axis in the water tank, and having a cylindrical shape having an opening in a front plate portion;
A balance ring provided on a portion of the peripheral wall portion of the drum on the front plate portion side ,
A hot air supply unit that includes a hot air supply unit near the front opening of the water tank, and supplies hot air from the hot air supply unit to the inside of the drum through the opening of the water tank and the opening of the drum;
An annular first seal wall portion provided on the front plate portion of the drum at a position closer to the warm air supply portion than the balance ring;
A maze-like shape is provided on the front plate portion of the water tank so as to be located closer to the hot air supply portion than the balance ring and close to the first seal wall portion. A drum type washing machine comprising: an annular second seal wall constituting a seal portion. At least one of the front plate portion of the drum and the front plate portion of the water tank is made of a metal plate,
2. A drum type as claimed in claim 1, wherein the sealing wall portion of the front plate portion of the drum or the front plate portion of the water tank, which is made of a metal plate, has a convex shape and is integrally formed by squeezing. Washing machine. 2. The method according to claim 1, wherein one of the first seal wall and the second seal wall has a convex shape, and the other has a concave shape fitted in a non-contact state with the convex seal wall. A drum-type washing machine as described. At least one of the front plate portion of the drum and the front plate portion of the water tank is made of plastic,
The drum-type washing machine according to claim 1, wherein the sealing wall portion of the front plate portion of the drum or the front plate portion of the water tank, which is made of plastic, is formed integrally with a rib. An outer box with a laundry doorway formed in the front plate,
A water tank supported in the outer box and having an opening formed in the front plate portion,
A connection member made of an elastic material that connects the laundry doorway of the outer box and the opening of the water tub to communicate with each other;
A cylindrical drum provided rotatably around a substantially horizontal axis in the water tank and having an opening in a front plate portion,
A balance ring provided on a portion of the peripheral wall portion of the drum on the front plate portion side ,
A hot-air supply unit that includes a hot-air supply unit in the connection member, and supplies hot air into the drum from the hot-air supply unit through the opening of the water tank and the opening of the drum;
An annular first seal wall portion formed on the front plate portion of the drum at a position closer to the hot air supply portion than the balance ring;
The connection member includes an annular second seal wall portion provided so as to approach the first seal wall portion and forming a maze-shaped seal portion with the first seal wall portion. Drum type washing machine.

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