JP2000189691A - Drum type washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain deterioration of a balance ring while restraining vibration and reducing weight. SOLUTION: In a front plate part 27 of a water tank 23, an opening 27a is formed. The opening 27a and a washing inlet/outlet 22a in a case 21 are communicated with/connected to each other by a connection member 28. At the connection member 28, a warm air supply port 49 of a warm air supply device 41 is provided. In a front plate part 33 of a drum 30 disposed inside the water tank 23, an opening 33a is formed. A balance ring 34 is provided at a circumferential wall part of the drum 30. A first seal wall part 51 is formed on the front plate part 33 of the drum 30 to be positioned more on the warm air supply port 49 than the balance ring 34, and a second seal wall part 52 to compose a maze-like seal part 50 with the first seal wall part 51 is formed on the front plate part 27 of the water tank 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum type washing machine provided with a drum which is rotated substantially horizontally in a water tub, so that washing from drying to washing can be performed.

[0002]

As a drum type washing machine of this type, one having the structure shown in FIG. 8 has been considered.
This will be described. In front of outer box 1, laundry entrance 2
A cylindrical water tank 3 having an opening 3a on the front surface is supported inside the outer box 1 via a vibration damping mechanism. Inside the water tank 3, a drum 4 having an opening 4a on a front surface and a large number of holes 4b on a peripheral wall portion is provided rotatably about a horizontal axis by a bearing mechanism 5 at a rear portion. The drum 4 is directly driven by a direct drive type motor 6.

A support 4c is intermittently provided on the back of the drum 4, and a back plate 4e having a hole 4d is provided in the support 4c. And
A hot air return port 3b 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 provided with a hot air supply device 11 having a blower 9 and a heater 10. Is connected to one end (blower 9 side). The heater 10 side of the hot air supply device 11 is fitted and connected to the fitting opening 7a via a duct 10a.
The opening 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 an 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 connecting 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. . Then, 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 the drying of the laundry (the material to be dried). The 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.

By the way, generally, in a drum type washing machine,
It is known that vibration is likely to occur during washing and spin-drying, 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.

As a countermeasure, as shown in FIG. 9, the present inventor has considered that a balance ring 13 is attached to the peripheral wall of the drum 4 so as to suppress vibration and reduce the weight. The mounting position of this balance ring 13 is as follows.
As shown in the figure, a peripheral wall is preferable near the opening 4a of the drum 4.

By the way, in the case of this type of drum type washing machine, the warm air (which is a high temperature) discharged from the warm air supply port 11 is almost as indicated by the arrow P as described above. Before flowing into the drum 4, a part of the water may flow between the opening edge of the drum 4 and the opening edge of the water tank 3, as indicated 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, the balance ring 13
In the case of a liquid-filled type, the internal liquid expands and the internal pressure increases, the degree of deterioration is large, and it is necessary to pay due attention to material selection and molding. By the way, drum 4
Inside, the warm air contacts the balance ring 13. In this case, the laundry is agitated in the drum 4, and the warm air exchanges heat with the laundry to lower the temperature. Such a heat load is reduced, and the balance ring 13 is less deteriorated.

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 weight. .

[0009]

According to a first aspect of the present invention, there is provided a water tank supported in an outer box and having an opening in a front plate, and a front plate provided in the water tank so as to be rotatable about a substantially horizontal axis. A drum having a cylindrical shape having an opening, a balance ring provided on the peripheral wall of the drum, and a hot air supply section near the front opening of the water tank; A hot air supply device for supplying hot air into the drum through the opening of the drum; and an annular first provided on the front plate portion of the drum at a position closer to the hot air supply portion than the balance ring. A seal wall portion, and a front plate portion of the water tank, wherein the first seal wall portion is provided so as to be located closer to the hot air supply portion than the balance ring and closer to the first seal wall portion; And an annular second sealing wall portion forming a maze-shaped sealing portion. It is made of Te.

In the above structure, since the balance ring is provided on the peripheral wall of the drum, vibration can be suppressed without increasing the overall weight. Moreover, an annular first seal wall portion 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. Located in the first
The second sealing wall portion is provided so as to approach the sealing wall portion, and the first sealing wall portion and the second sealing wall portion constitute a maze-shaped sealing portion. The space between the hot-air supply unit and the balance ring portion in the space between the tank and the water tank is sealed by the maze-shaped seal portion, so that the balance ring does not become excessively hot. Degradation can be suppressed.

According to a second aspect of the present invention, 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, and the front plate portion of the drum or the front plate of the water tank is made of a metal plate. The seal wall portion in the portion is characterized in that it has a convex shape and is integrally formed by squeeze molding.

The drum or the water tank is often made of a metal plate, and therefore, each front plate is also often made of a metal plate. In this case, the sealing wall (the first sealing wall in the case of the drum, the second sealing wall in the water tank)
May be formed in a convex shape. At this time, since the seal wall is formed integrally by drawing,
Manufacturability is improved as compared with the case where the seal wall is formed by a separate member.

According to a third aspect of the present invention, one of the first seal wall portion and the second seal wall portion has a convex shape, and the other has a concave shape which fits in a non-contact state with the convex seal wall portion. It is characterized by In this configuration, the degree of maze of the seal portion composed of 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.

According to a fourth aspect of the present invention, at least one of the front plate portion of the drum and the front plate portion of the water tank is made of plastic, and the front plate portion of the drum or the front plate portion of the water tank is made of plastic. The seal wall is characterized in that it is 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 in a rib shape, the seal wall is formed by a separate member. As a result, the productivity is better and the strength is improved.

According to a fifth aspect of the present invention, there is provided an outer box having a laundry entrance formed in a front plate, a water tub supported in the outer box and having an opening formed in the front plate, and a laundry in the outer box. A connecting member made of an elastic material for connecting the entrance and the opening of the water tank so as to communicate with each other, and 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 peripheral wall of the drum, and a hot air supply unit provided in the connection member, and the hot air supply unit supplies hot air into the drum through the opening of the water tank and the opening of the drum. A hot air supply device, 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, and Is provided so as to approach the seal wall of the first member.
And an annular second seal wall which forms a maze-shaped seal with the seal wall.

In the above construction, since the laundry entrance / exit of the outer box and the opening of the water tub are connected by an elastic connecting member, the vibration on the water tub side is not transmitted to the outer case. The connecting member can guide the warm air toward 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, the balance ring can be prevented from being excessively heated 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 is formed.
Can be elastically deformed, and even if the second seal wall and the first seal wall on the drum side should come into contact with each other, generation of loud noise can be prevented. Damage can also be prevented.

A sixth aspect of the present invention is characterized in that a ventilation portion is formed in the front plate portion of the drum at a position closer to the hot air supply portion than the seal portion. In this configuration, when the hot air from the hot air supply unit flows into the seal unit, a relatively large static pressure is required, but the hot air does not require a large static pressure to pass through the ventilation unit. The hot air does not pass through the seal portion but passes through the ventilation portion, and the hot air blocking effect of the seal portion is further improved.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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-back 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.

The water tank 23 includes, for example, a body 25, a rear plate 26, and a front plate 27, each of which is formed of a metal plate.
In the front plate 27, a circular opening 27a is formed. And this opening 27
The laundry inlet / outlet 22a 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, having a cylindrical shape as a whole. The laundry entrance 22a is opened and closed by a door 29.

A drum 30 is rotatably provided inside the water tank 23. The drum 30 includes, for example, a body 31 formed of a metal plate and a rear member 3.
2 and the front plate 33. The rear member 32 is provided with a hole 32d in a frame 32c having a central portion 32a and a beam portion 32b extending radially therefrom.
Is mounted. Also,
A large number of holes 31 a are formed in the peripheral wall of the body 31, and a circular opening 3 is formed in the front plate 33.
3a are formed.

In the drum 30, a balance ring 34 is attached to a portion near the front side of the inner peripheral portion of the body 31. The balance ring 34 is configured by enclosing a liquid such as 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.

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. The drum shaft 35 is attached through the rear plate 26 of the water tank 23. The bearing 30 is rotatably supported by a bearing housing 36 via a bearing 37, so that the drum 30
Are provided rotatably.

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.

Next, the hot air supply device 41 with a heat exchanger will be described. That is, the rear plate portion 26 of the water tank 23 includes:
A warm air return port 42 is formed. This hot air return port 42
Is connected to one end of a heat exchanger 43 for exchanging heat between the outside air and the warm air. The other end of the heat exchanger 43 is connected via a bellows-like connecting duct 44 to a blower having a blower blade inside. 4
5 is connected to the suction side. 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.

The other end of the duct 48 is fitted into a fitting opening 28a formed in the connecting member 28 so that the connecting member 2
8, a hot air supply port 49 serving as a hot air supply unit is provided. 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 generates heat. 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 discharged from the hot air supply port 49 into the connecting member 28, and is supplied into the drum 30 through the opening 27 a of the water tank 23 and the opening 33 a of the drum 30. And
By contributing to the drying of the laundry (substance to be dried) in the drum 30, the heat exchanger 4 is connected through the hole 32 d and the hot air return port 42.
Passed through 3. This heat exchanger 43 dehumidifies the warm air. Thus, the laundry in the drum 4 is dried.

During the drying operation, the outer box 21
The laundry inlet / outlet 22a and the opening 27a of the water tub 23 are connected to each other by a connecting member 28 made of an elastic material. The wind can be guided to the inside of the drum 30.

The front plate 27 of the water tank 23 and the drum 3
The zero front plate portion 33 is provided with a maze-shaped seal portion 50. 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
A front plate portion 33 made of a metal plate of the drum 30 is attached to the front plate portion 3.
3 is formed in a convex shape having a U-shaped cross section by squeezing and forming. Further, the second seal wall portion 52 is
The front plate portion 27 made of a metal plate of No. 3 is formed into a convex shape having a U-shaped cross section by squeezing and molding the front plate portion 27. The first seal wall portion 51 and the second seal wall portion 52 are located closer to the warm 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.

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 hot air return port 4
2. Repeatedly returning to the hot air return port 42 through the heat exchanger 43, the blower 45, the heating device 47, the hot air supply port 49, the opening 27a of the water tank 23, the opening 33a of the drum 30, and the drum 30 again. In this case, the warm air discharged from the warm air supply port 49, as shown by the arrow B in FIG.
There is a concern that the fluid may flow from between the front plate portion 33 of the water tank 23 and the front plate portion 27 of the water tank 23 to the outer peripheral surface side of the drum 30, that is, to the balance ring 34 side.

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. That is, the balance ring 34 is not excessively heated, and the balance ring 3
4 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 also balance ring 3
4 can be suppressed. In particular, according to the present embodiment, the drum 3
Since the front plate part 33 of the water tank 23 and the front plate part 27 of the water tank 23 are made of a metal plate, the seal walls 51 and 52 are formed integrally by drawing.
The productivity is improved as compared with the case where 52 is formed. That is, for example, when the first seal wall portion or the second seal wall portion formed 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, as described above, such a situation does not occur.

FIG. 3 shows a second embodiment of the present invention. In this embodiment, the configuration of the seal portion 61 is the first type.
Is different from the embodiment. That is, the first seal wall 62
Is formed in a convex shape like the first seal wall portion 51 described above, but the second seal wall portion 63 is formed so as to have a concave shape. That is, the second seal wall 63 is
By forming the convex portions 63a and 63b apart, the concave portions are formed as a result. Then, the first seal wall portion 62 is fitted into the concave second seal wall portion 63 in a non-contact state.

According to this embodiment, the maze degree of the seal portion 61 formed by the convex first seal wall portion 62 and the concave second seal wall portion 63 becomes more complicated, and the sealing effect is improved. Therefore, the deterioration of the balance ring 34 can be more effectively prevented. In this case, the first
The seal wall portion 62 may have a concave shape, and the second seal wall portion 63 may have a convex shape.

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 the first.
Is different from the 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 the shape of a rib.

In the third embodiment, the drum 30
The front plate portions 72 and 73 of the water tank 23 are made of plastic, and in this case, the sealing wall portions 74 and 75
Are integrally formed in a rib shape, so that the manufacturability and the strength are improved as compared with the case where the seal wall is formed by a separate member. Further, when the seal walls 51 and 52 are formed by squeezing a metal plate as in the first embodiment, it is difficult to perform deep drawing.
Although the projecting length of the projection 52 cannot be so long, the sealing wall 7 made of a plastic rib as described above is used.
In the case of Nos. 4 and 75, the protruding length can be increased by plastic molding, so that the proximity region (wrap region) can be increased, and the sealing property is further improved.

FIG. 5 shows a fourth embodiment of the present invention. In this embodiment, the structure 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 above-described first seal wall portion 74, but the second seal wall portion 83 is The connection member 28 is formed in a rib shape at an end 28a on the water tank 23 side.

According to this embodiment, the second connecting member 28
Is formed, the second seal wall 83 can also be elastically deformed. Therefore, the second seal wall 83 and the first seal wall 82 on the drum 30 side are formed.
Even if they do contact each other, it is possible to prevent generation of loud noise and also prevent breakage.

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 require a large static pressure to pass through the ventilation portion 91. Eventually, the warm air passes through the ventilation section 91, and the sealing effect of the seal section 73 on the warm air is further improved.

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,
The second seal wall 103 has a concave shape that bulges out to the side opposite to the front plate 71 of the drum 30. The first seal wall 102 is fitted into the second seal wall 103 in a non-contact manner.

According to the sixth embodiment, the sealing portion 10
The degree of maze 1 is more complicated than in the third embodiment, and the sealing effect is further improved. In this case, the first seal wall 102 is made concave, and the second seal wall 1
03 may be convex.

In the above embodiment, the case where both the front plate of the drum and the front plate of the water tank are made of a metal plate and the case where both are made of plastic are illustrated. A metal plate and the other may be made of plastic. Further, in each of the above-described embodiments, the dehumidification circulation type is exemplified as the hot air supply device, but a type in which the exhausted hot air is discharged to the outside may be used.

[0040]

As apparent from the above description, the present invention has the following effects. According to the invention of claim 1, since the balance ring is provided on the peripheral wall of the drum,
Vibration can be suppressed without increasing the overall weight, and a first seal wall portion is provided on the front plate portion of the drum at a position closer to the hot air supply portion than the balance ring, Since the front plate of the water tank is provided with a second sealing wall that forms a maze-shaped sealing part with the first sealing wall, the balance ring portion of the space between the drum and the water tank is provided. The space leading to the cavity is sealed by the maze-shaped seal portion, so that the balance ring can be prevented from being excessively heated, and the deterioration of the balance ring can be suppressed.

According to the second aspect of the present invention, 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. The productivity can be improved as compared with the case of forming. 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 fitted in a non-contact state with the convex seal wall. As a result, the sealing effect is further improved.

According to the fourth aspect of the present invention, 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.
Compared to the case where the seal wall is formed by a separate member, the manufacturability is improved, the strength is improved, and the sealability 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 in the event of contact, generation of loud noise can be prevented and breakage can be prevented. According to the invention of claim 6, since the ventilation portion is formed in the front plate portion of the drum closer to the hot air supply portion than the seal portion, the effect of blocking the hot air from the seal portion is further improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a main part showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view of the entire drum type washing machine.

FIG. 3 is a view corresponding to FIG. 1, showing a second embodiment of the present invention;

FIG. 4 is a view corresponding to FIG. 1, showing a third embodiment of the present invention;

FIG. 5 is a view corresponding to FIG. 1, showing a fourth embodiment of the present invention.

FIG. 6 is a view corresponding to FIG. 1, showing a fifth embodiment of the present invention.

FIG. 7 is a view 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.

[Explanation of symbols]

21 is an outer box, 22a is a laundry doorway, 23 is an aquarium, 27
Is a front plate portion, 27a is an opening, 28 is a connecting member, 30 is a drum, 33 is a front plate portion, 34 is a balance ring, 38 is a motor, 41 is a hot air supply device, 42 is a hot air return port, and 43 is hot air. Exchanger, 47 is a heating device, 49 is a hot air supply port (hot air supply unit), 50 is a seal portion, 51 is a first seal wall portion, 52
Is 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, 7
2 is a front plate portion, 73 is a seal portion, 74 is a first seal wall portion, 75 is a second seal wall portion, 81 is a seal portion, 82 is a first seal wall portion, and 83 is a second seal portion. , 91 is a ventilation portion, 101 is a seal portion, 102 is a first seal wall portion, 1
03 denotes a second seal portion.

Claims (6)

[Claims] 1. A water tank supported in an outer case and having an opening in a front plate portion, a cylindrical drum provided in the water tank so as to be rotatable about a substantially horizontal axis and having an opening in the front plate portion, A balance ring provided on the peripheral wall of the drum, and a hot air supply unit near the front opening of the water tank, from which hot air is supplied into the drum through the opening of the water tank and the opening of the drum. A hot air supply device to be supplied; an annular first seal wall provided on the front plate of the drum at a position closer to the hot air supply than the balance ring; and a front plate of the water tank. An annular ring that is provided closer to the warm air supply unit than the balance ring and is closer to the first seal wall, and forms a maze-shaped seal with the first seal wall. And a second sealing wall 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, and the seal wall portion on the front plate portion of the drum or the front plate portion of the water tank made of a metal plate. The drum-type washing machine according to claim 1, wherein the drum-type washing machine has a convex shape and is integrally formed by squeeze molding. 3. 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. The drum type washing machine according to claim 1, wherein 4. At least one of the front plate portion of the drum and the front plate portion of the water tank is made of plastic, and 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, 2. The drum type washing machine according to claim 1, wherein the drum type washing machine is formed integrally with a rib. 5. An outer box having a laundry doorway formed in a front plate portion, a water tub supported in the outer box and having an opening formed in the front plate portion, a laundry doorway of the outer box and a water tank. A connecting member made of an elastic material for connecting the opening so as to communicate with the opening; a cylindrical drum provided in the water tank so as to be rotatable around a substantially horizontal axis, and a cylindrical drum having an opening in a front plate portion; and a peripheral wall of the drum A balance ring provided in the unit, 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 formed on the front plate of the drum at a position closer to the warm air supply unit than the balance ring; and the first seal wall on the connection member. A maze-shaped seal is provided so as to approach the first seal wall. Drum-type washing machine comprising a second sealing wall of the annular constituting a part. 6. The drum-type washing machine according to claim 1, wherein a ventilation portion is formed in a front plate portion of the drum at a position closer to the hot air supply portion than the seal portion.