JP2004008543A - Washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a spin-drying time by efficiently spin-drying laundry in a short time. <P>SOLUTION: A washing machine includes ventilation holes 8b on the bottom of the inner tub 4 which is supported so as to be freely rotatable in an outer tub 1. A plurality of blades 7 are radially arranged on an outer wall surface at the bottom of the inner tub 4. A casing 10 is projected form the bottom of the outer tub 1 so as to enclose the blades 7. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a washing machine that stores laundry in an inner tub and performs dehydration processing.
[0002]
[Prior art]
In most of the conventional dehydration processes of a washing machine, an inner tub for storing laundry is rotated at a high speed to separate water contained in the laundry by centrifugal force. Recently, there is a method of blowing hot air to the laundry during dehydration to improve the dehydration rate. This type of washing machine is shown in FIG.
[0003]
In FIG. 5, reference numeral 50 denotes an outer tub which is suspended elastically from a housing 51 of the washing machine. Reference numeral 53 denotes an inner tub for accommodating the laundry 54, which has a rotation center axis in a vertical direction in the outer tub 50 and is rotatably supported. The inner bottom of the inner tub 53 is provided with a stirring blade 55 for stirring the laundry.
[0004]
Driving means 56 is provided below the outer tub 50, and its rotation axis is hollow and has a biaxial structure. The rotation of the driving means 56 is performed by the stirring blade 55 and the inner tub 53 in the washing step, the rinsing step and the dehydrating step. To communicate. In the washing step and the rinsing step, the stirring blade 55 or the inner tub 53 is rotated to stir the laundry 54 in the inner tub 53 for washing and rinsing. In the dehydration step, the inner tub 53 is rotated at a high speed to perform dehydration.
[0005]
Above the inner tub 53, a fluid balancer 57 is provided to correct the bias of the laundry 54 during high-speed rotation of the inner tub 53 in the spin-drying process to reduce vibration and enable high-speed rotation. A blower 58 for blowing dry air for blowing hot air onto the laundry 54 is provided substantially above the housing 51, and a heater 59 is provided on the discharge side of the blower 58.
[0006]
Reference numeral 60 denotes an air outlet, which heats the air taken in from the air inlet 61 by the heating means 59 and blows out hot air to the inner tank 53. A lid 62 is provided on the upper part of the housing 51, and a middle lid 63 that faces the lid 62 and opens and closes an upper opening of the outer tank 50 is provided. A discharge port 64, a drain valve 65, and a drain port 66 are provided in a lower portion of the outer tank 50. Reference numeral 67 denotes an exhaust duct which connects the downstream side of the exhaust port 64 and the exhaust port 68.
[0007]
Description of the washing and rinsing steps of the conventional washing machine described above is omitted, and the operation of the dehydrating step will be described. In the dehydration step, after the washing / rinsing step is completed, the water in the inner tub 53 is drained by opening the drain valve 65, and then the inner tub 53 is rotated at high speed by the power of the driving means 56 to remove the water contained in the laundry 54. It is separated by centrifugal force.
[0008]
By operating the blowing means 58 and the heating means 59 while rotating the inner tank 53 at high speed, warm air is supplied from the outlet 60 to the inner tank 53. The hot air comes into contact with the laundry 54, flows out of the inner tub 53, passes through the exhaust duct 67 from the exhaust port 64, and is exhausted from the exhaust port 68.
[0009]
[Problems to be solved by the invention]
However, in a conventional washing machine that spins water only by rotating the inner tub 53 at high speed, the ability to separate the water contained in the laundry 54 is determined to some extent by the strength of the centrifugal force determined by the rotation speed of the inner tub 53. . Generally, the rotation speed of the inner tank 53 is about 700 to 1000 rotations per minute, and if the rotation speed is further increased, vibration and noise increase, which is not practical. Therefore, the dehydration rate could not be dramatically improved.
[0010]
Further, in a conventional washing machine having a configuration in which warm air is blown into the inner tub 53 during the dewatering step as shown in FIG. 5, the dewatering rate can be improved as compared with the conventional washing machine, but it is not efficient. The reason is that warm air is blown into the inner tub 53 from the outlet 60 and comes into contact with the laundry 54, but the dehydrated laundry 54 is not uniformly present on the inner peripheral wall surface of the inner tub 53. This is due to the state of the laundry 54 before the start of the dehydration step.
[0011]
The laundry 54 is pushed toward the bottom of the inner tub 53 by its own weight, and there is a space above. This state becomes remarkable when the processing capacity of the laundry 54 is small, and a large space exists above the inner tub 53. When the dehydration step is started in the above state, the laundry 54 moves toward the peripheral wall surface of the inner tub 53 by centrifugal force due to the rotation of the inner tub 53.
[0012]
As described above, the upper portion of the inner tub 53 has no or little laundry 54, and the hot air passes through the portion where the air resistance is small. Therefore, the hot air only comes into contact with the surface of the laundry 54 only, and is exhausted without actively contacting the location where the laundry 54 is concentrated. As described above, the dehydration rate of the laundry could not be significantly improved. Also, the dehydration time was long.
[0013]
An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to efficiently and efficiently dehydrate laundry in a short time in a laundry dehydrating step to improve a dehydration rate.
[0014]
[Means for Solving the Problems]
In order to solve the conventional problem, a washing machine of the present invention comprises a housing, an outer tub elastically supported in the housing, and a bottomed opening rotatably supported in the outer tub. An inner tub for storing laundry and a driving means for rotating the inner tub, a vent hole is provided at the bottom of the inner tub, and a plurality of blades are provided substantially radially on an outer wall surface at the bottom of the inner tub. It is provided.
[0015]
Thereby, the flow of air or warm air can be effectively generated toward the bottom of the inner tank. Therefore, since air or warm air can be evenly passed through a location where laundry is concentrated, the evaporation of moisture contained in the laundry is promoted, the dehydration rate is dramatically improved, and the dehydration time is reduced. Can be.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention according to claim 1 stores a housing, an outer tub elastically supported in the housing, and a bottomed opening that is rotatably supported in the outer tub and stores laundry. The inner tank, equipped with a driving means for rotating the inner tank, by providing a ventilation hole at the bottom of the inner tank and by providing a plurality of blades substantially radially on the bottom outer wall surface of the inner tank, in the dehydration step When the inner tub is rotated at a high speed, an air flow can be generated in a direction substantially perpendicular to the radial direction of the rotation axis of the blade, so that the air is forcibly passed also to the bottom of the inner tub where laundry is easily concentrated. Air can be forcibly discharged from the bottom of the inner tank. For this reason, in addition to the water separation by centrifugal force, even when the laundry is in a large volume to a small volume, the air always passes through the laundry effectively, so that the evaporation of the moisture contained in the laundry is promoted and the dehydration rate is reduced. Dramatically improved and dehydration time is reduced.
[0017]
According to a second aspect of the present invention, in the first aspect of the present invention, a plurality of blades projecting substantially radially from the bottom outer wall surface of the inner tank are formed integrally with the inner tank, so that the configuration is simple and the assembly is simple. Can be realized easily and inexpensively.
[0018]
According to a third aspect of the present invention, in the first aspect of the present invention, the casing portion for gradually rectifying the flow of air due to the rotation of the inner tank is projected from the bottom of the outer tank so as to include a plurality of blades. By this, the air generated by the blades provided in the inner tank is more efficiently generated, a larger amount of air can be blown, and the evaporation of moisture is promoted, so that the dehydration rate can be more effectively improved and the dehydration time can be increased. The noise can be further reduced and the noise can be reduced at the same time.
[0019]
According to a fourth aspect of the present invention, in the invention of the third aspect, at least one of a casing portion in which a plurality of blades protruding substantially radially from the bottom outer wall surface of the inner tank protrude from the inner tank and the outer tank bottom. Are formed integrally with the inner tank or the outer tank, respectively, so that the structure is simple, the assembly is easy, and the cost can be reduced.
[0020]
According to a fifth aspect of the present invention, in the first to fourth aspects of the present invention, a rotatable stirring blade is provided at the bottom of the inner tank, and a plurality of ventilation holes are provided in the stirring blade. Combined with the vents provided at the bottom of the tub, air can be more smoothly guided and passed through to the bottom of the inner tub where laundry is easy to concentrate, further evaporating the moisture contained in the laundry and dehydrating. The rate is dramatically improved and the dewatering time is reduced.
[0021]
The invention according to claim 6 is the invention according to claims 3 to 5, wherein the outlet of the casing portion protruding from the bottom of the outer tank is provided in the outer tank, and the outlet is opposed to the outlet to the outer tank. By providing the exhaust port, the loss of air flow is small, the decrease in flow rate is suppressed, the dewatering rate can be improved effectively, and the drainage path for draining water in the outer tub has a simple configuration. Can be.
[0022]
The invention according to claim 7 is the invention according to claims 3 to 5, wherein an exhaust passage communicating with the outlet of the casing projecting from the bottom of the outer tank is provided, and a drain port communicating with each other is provided at the casing. Since the airflow loss is small, the air is efficiently generated by the blades and a large amount of air can be blown by providing the airflow inside and outside, the dewatering rate can be effectively improved.
[0023]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0024]
(Example 1)
FIG. 1 is a longitudinal sectional view of a washing machine according to a first embodiment of the present invention, and FIG. 2 is a plan sectional view of a main part of the washing machine.
[0025]
In FIG. 1, reference numeral 1 denotes an outer tub elastically suspended from a housing 2 of a washing machine, which is installed by a suspension mechanism 3 so as to be suspended from the housing 2 for vibration isolation. Reference numeral 4 denotes an inner tub for accommodating the laundry 5, which has a rotation center axis in a vertical direction in the outer tub 1, is rotatably supported, and has a bottomed shape having an opening 6 for taking in and out the laundry 5. is there. The bottom outer wall of the inner tank 4 is provided with a plurality of blades 7 protruding in a rib shape in the direction of the rotation axis substantially radially around the rotation axis.
[0026]
Further, a plurality of small holes 8a are provided on the peripheral wall of the inner tank 4 and a plurality of small holes 8b serving as ventilation holes for exhausting air flowing through the inner tank 4 are provided on the bottom surface. Is provided with a stirring blade 9 for stirring the laundry 5, and a plurality of small holes 9 a through which the air flowing through the inner tub 4 passes is provided on the wall surface of the stirring blade 9. A casing 10 is provided at the bottom of the outer tub 1, and protrudes so as to include the blade 7.
[0027]
The casing portion 10 gradually rectifies the flow of air due to the rotation of the inner tank 4, and has a scroll shape that gradually widens from upstream to downstream of the flow. The upper end surface of the casing 10 has a height having a slight gap with the bottom outer wall surface of the inner tank 4. The bottom of the inner tank 4 is made of a resin material, and the blades 7 are formed integrally with the inner tank 4. Further, the wall surface constituting the casing portion 10 is also formed integrally with the bottom of the outer tub 1.
[0028]
Further, the outlet 11 of the casing 10 is provided in the outer tub 1. Driving means 12 is provided below the outer tub 1, and its rotating shaft is hollow and has a biaxial structure. In the washing step, the rinsing step and the dewatering step, the rotation of the driving means 12 is performed by the stirring blade 9 and the inner tank 4. To communicate. In the washing step and the rinsing step, the stirring blade 9 or the inner tub 4 is rotated to stir the laundry 5 in the inner tub 4 for washing and rinsing.
[0029]
In the dehydration step, the inner tub 4 is rotated at a high speed to perform dehydration. A fluid balancer 4a is provided above the inner tub 4 to correct the bias of the laundry when the inner tub 4 rotates at a high speed in the spin-drying process, thereby reducing vibration and enabling high-speed rotation. Numeral 14 denotes an air blowing means for blowing air to the inner tank 4. An air inlet 15 is provided on the upstream side of the air blowing means 14, and a heating means 16 is provided on the downstream side of the air blowing means 14.
[0030]
A lid 18 is provided on the upper part of the housing 2, and an inner lid 19 that faces the lid 18 and opens and closes an upper opening of the outer tub 1 is provided. A discharge port 20, a drain valve 21, and a drain port 22 are provided in a lower portion of the outer tank 2. An exhaust passage 23 is configured to communicate with an exhaust port 24 provided at a position facing the outlet 11 of the casing 10 and an exhaust port 25 on the downstream side.
[0031]
The operation and operation of the washing machine configured as described above will be described below. First, in the washing process, laundry 5 and detergent are put into the inner tub 4 and washing is performed for a predetermined time. Next, in the rinsing step, the drain valve 21 is opened to drain the washing water. Thereafter, the drain valve 21 is closed, a predetermined amount of water is supplied to the outer tub 1, and the stirring blade 9 is operated for a predetermined time to transfer the detergent of the laundry 5 to the rinse water. Next, the drain valve 21 is operated to drain the rinsing water in the outer tub 1, and the rinsing step is completed.
[0032]
In the dehydration step, after the washing step and the rinsing step are completed, the inner tub 4 is rotated at a high speed by the power of the driving means 12, and the water contained in the laundry 5 is separated by centrifugal force and dehydrated. The laundry 5 during dehydration does not evenly exist on the inner peripheral wall surface of the inner tub 4. This is because the state of the laundry 5 before the dehydration process is started is pushed toward the bottom of the inner tub 4 by the weight of the laundry 5 and a space exists above the laundry 5. When the dehydration process is started in the above state, the laundry 5 is rotated at a high speed by the inner tub 4 and the laundry 5 is centrifugally urged. This is because the laundry 5 moves in the direction, and the upper part of the inner tub 4 has no or little laundry 5.
[0033]
Simultaneously with the start of the dehydrating step, the blowing means 14 and the heating means 16 are operated to blow warm air from the outlet 17 into the inner tank 4. On the other hand, due to the effect of the blades 7 provided on the bottom outer wall of the inner tank 4 with the high-speed rotation of the inner tank 4, an air flow as shown by an arrow A in FIG. Becomes stronger towards the bottom of the
[0034]
The air outside the bottom of the inner tank 4 generates an air flow in a direction substantially perpendicular to the radial direction of the rotation axis of the inner tank 4 by the action of the blades 7. At this time, the speed is gradually reduced between the point X and the point Y along the scroll-shaped casing as shown in FIG. That is, efficient operation is enabled by the pressure recovery, and both the pressure and the air volume increase.
[0035]
In this way, the warm air flowing into the inner tub 4 passes through the inside of the laundry 5, passes through the small holes 9 a, 8 b, and blows out from the casing 10 and the outlet 11. The air passes through an exhaust passage 23 from an exhaust port 24 provided at a position facing the outlet 11, and is discharged out of the housing 2 from an exhaust port 25.
[0036]
As described above, according to the present embodiment, the ventilation holes are provided at the bottom of the inner tub 4 for storing the laundry 5 and the plurality of blades 7 are provided substantially radially on the outer wall surface of the bottom of the inner tub 4. Accordingly, when the inner tub 4 is rotated at a high speed in the dehydrating step, the moisture contained in the laundry 5 is discharged from the small holes 8a by centrifugal force, and at the same time, the air substantially perpendicular to the radial direction of the rotation axis of the blade 7 Can be generated, and the air can be forcibly passed through and discharged from the bottom of the inner tub 4 where the laundry 5 tends to concentrate.
[0037]
For this reason, in addition to the water separation by centrifugal force, air can always be passed through the laundry 5 effectively regardless of whether the laundry 5 has a large capacity or a small capacity, and the moisture contained in the laundry 5 can be reduced. Evaporation is promoted, dehydration rate is dramatically improved, and dehydration time is shortened.
[0038]
In addition, a casing 10 for gradually rectifying the flow of air due to the rotation of the inner tank 4 is projected from the bottom of the outer tank 1 so as to include the blades 7, and the outlet 11 of the casing 10 is connected to the inside of the outer tank 1. And the discharge port 20 is provided in the outer tub 1 so as to face the blow-out port 11, so that the blades 7 provided in the inner tub 4 can efficiently generate air, blow a large amount of air, and evaporate moisture. Therefore, the dewatering rate can be more effectively improved, the dewatering time can be shortened, and noise can be reduced.
[0039]
Furthermore, a plurality of blades 7 projecting substantially radially from the bottom outer wall surface of the inner tank 4 are formed integrally with the inner tank 4, and a casing 10 projecting from the bottom of the outer tank 1 is formed integrally with the outer tank 1. By doing so, an inexpensive washing machine with a simple configuration, easy assembly, and low cost can be realized.
[0040]
In this embodiment, the warm air is blown onto the laundry 5 during the dehydration to make contact with the laundry. However, simply blowing air without the heating means 16 allows the air to pass through the laundry 5 effectively. The rate is improved. Furthermore, even if the air blowing means 14 and the heating means 16 are not provided, the air can effectively pass through the laundry 5 by the effect of the blades 7, so that the dewatering rate can be improved.
[0041]
In this embodiment, the blades 7 are formed integrally with the inner tank 4, but they may be provided separately from the inner tank 4 and riveted, welded, or screwed. In the present embodiment, air is taken in from the outside of the housing 2 and exhausted to the outside of the housing 2. However, the same effect can be obtained by a closed system in which air is circulated.
[0042]
(Example 2)
FIG. 3 is a longitudinal sectional view of a washing machine according to a second embodiment of the present invention, and FIG. 4 is a plan sectional view of a main part of the washing machine. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0043]
A casing 26 is provided at the bottom of the outer tub 1 and protrudes so as to include the blade 7. The casing portion 26 is for gradually rectifying the flow due to the rotation of the inner tank 4, and has a scroll shape. The upper end surface of the casing portion 26 has a height having a slight clearance with the bottom outer wall surface of the inner tank 4. The bottom of the inner tank 4 is made of a resin material, and the blades 7 are formed integrally with the inner tank 4. Further, the wall surface constituting the casing portion 26 is also formed integrally with the bottom of the outer tub 1.
[0044]
The outlet 27 of the casing 26 projects outward from the bottom of the outer tub 1 to form a closed flow passage and communicates with the exhaust passage 23. Reference numeral 28 denotes a discharge port, which is provided inside the casing portion 26, and the discharge ports 20 provided outside the casing portion 26 and inside the outer tub 1 have their inlets provided independently, and are provided upstream of the drain valve 19. Communicated with each other on the side.
[0045]
The operation and operation of the washing machine configured as described above will be described below. First, the drainage in the washing step and the rinsing step is performed by opening the drain valve 19 to open and drain the water inside and outside the casing part 26 with the outlets 20 and 28 as the inlets of the respective drainage paths. The water is drained from the drain port 22 via the passage.
[0046]
Next, the operation of the dehydration step will be described. Simultaneously with the start of the dehydrating step, the blowing means 14 and the heating means 16 are operated to blow warm air from the outlet 17 into the inner tank 4. On the other hand, due to the effect of the blades 7 provided on the bottom outer wall surface of the inner tank 4 with the high-speed rotation of the inner tank 4, an air flow as shown by an arrow B in FIG. Becomes stronger towards the bottom of the The air outside the bottom of the inner tank 4 generates an air flow in a direction substantially perpendicular to the radial direction of the rotation axis of the inner tank 4 by the action of the blades 7.
[0047]
At this time, as shown in FIG. 4, along the scroll-shaped casing portion, the pressure is gradually reduced and restored from the point X to the point Y. This flow of air flows from the outlet 27 protruding outward from the bottom of the outer tank 1 to a continuous closed passage communicating with the exhaust passage 23 having a passage cross-sectional area substantially equal to the cross-sectional area of the outlet 27. Pass through. Since there is no large change in the cross-sectional area of the passage between the air blowing paths and air flows through the continuous passage cross-section, more efficient operation becomes possible, and both the pressure and the air volume increase.
[0048]
The reason for this is that when air flows through a passage whose cross-sectional area changes drastically, the streamline is disturbed and a flow such as a vortex having a largely different direction from the main flow is generated, resulting in loss. If the cross-sectional area changes abruptly, the friction with the wall increases, resulting in passage resistance. In this embodiment, since there is no abrupt change in the cross section of the passage as described above, the loss of the air flow can be reduced.
[0049]
Therefore, a large amount of air is introduced from the outlet 27 into the exhaust passage 23, and is discharged from the outlet 25 to the outside of the housing 2. As a result, the warm air that has flowed into the inner tub 4 passes through the inside of the laundry 5 as well as the inside thereof, is guided to the casing portion 26 from the small holes 9a and 8b, and is blown out from the outlet 27. For this reason, since warm air passes through the laundry 5, evaporation of moisture contained in the laundry 5 is further promoted. At the same time, noise can be reduced.
[0050]
As described above, according to the present embodiment, the exhaust passage 23 communicating with the outlet 27 of the casing 26 protruding from the bottom of the outer tub 1 is provided, and the outlets 20 and 28 communicating with each other are connected to the casing 26. By providing them inside and outside, loss of air flow is small, air can be efficiently generated by the blades 7 and a large amount of air can be blown, and the dewatering rate can be effectively improved.
[0051]
【The invention's effect】
As described above, according to the first aspect of the present invention, a housing, an outer tank elastically supported in the housing, and a bottomed opening rotatably supported in the outer tank. An inner tub having a portion for storing laundry, and a driving means for rotating the inner tub, a vent hole being provided at the bottom of the inner tub, and a plurality of blades substantially radially provided on an outer wall surface at the bottom of the inner tub. Is provided, the water contained in the laundry can be efficiently evaporated regardless of whether the laundry has a large capacity to a small capacity, the dewatering rate can be improved, and the dewatering time can be greatly reduced. .
[0052]
According to the third aspect of the present invention, since the casing for gradually rectifying the flow of air due to the rotation of the inner tank is projected from the bottom of the outer tank so as to include the plurality of blades, the casing is provided in the inner tank. The air generated by the blades is generated more efficiently, a larger amount of air can be blown, and the evaporation of water is promoted, so that the dewatering rate can be more effectively improved, the dewatering time can be further reduced, and at the same time low noise Can also be realized.
[0053]
According to the invention as set forth in claim 4, a plurality of blades protruding substantially radially from the bottom outer wall surface of the inner tank are formed integrally with the inner tank, or the casing part projecting from the bottom of the outer tank has an outer tank. Since it is formed integrally with the washing machine, it is possible to realize an inexpensive washing machine having a simple configuration, easy assembly, and low cost.
[0054]
According to the invention as set forth in claim 5, a rotatable stirring blade is provided at the bottom in the inner tank, and a plurality of ventilation holes are provided in the stirring blade. As the air can be more smoothly guided and passed to the bottom of the inner tub where the laundry is easily concentrated, the evaporation of the moisture contained in the laundry is further promoted, the dehydration rate is dramatically improved, and the dehydration time is improved. Is further reduced.
[0055]
According to the invention as set forth in claim 6, the outlet of the casing portion protruding from the bottom of the outer tank is provided in the outer tank, and the outlet is provided with the outlet in the outer tank so as to face the outlet. The loss of water is reduced, the flow rate is reduced, the dewatering rate can be effectively improved, and the drainage path for draining the water in the outer tub can be made simple.
[0056]
According to the invention of claim 7, the exhaust passage communicating with the outlet of the casing protruding from the bottom of the outer tank is provided, and the drain outlet communicating with each other is provided inside and outside of the casing. Thereby, the loss of the air flow is small, the air is efficiently generated by the blades, and a large amount of air can be blown, so that the dewatering rate can be more effectively improved.
[Brief description of the drawings]
1 is a longitudinal sectional view of a washing machine according to a first embodiment of the present invention; FIG. 2 is a plan sectional view of a main part of the washing machine; FIG. 3 is a longitudinal sectional view of a washing machine according to a second embodiment of the present invention; FIG. 5 is a sectional plan view of a main part of the washing machine. FIG. 5 is a longitudinal sectional view of a conventional washing machine.
DESCRIPTION OF SYMBOLS 1 Outer tub 2 Case 4 Inner tub 6 Opening 7 Blade 8a, 8b Small hole 9 Stirrer blade 9a Small hole 10, 26 Casing part 11, 27 Outlet 12 Driving means 14 Blowing means 16 Heating means 20, 28 Outlet 23 Exhaust passage

Claims (7)

A housing, an outer tub elastically supported in the housing, an inner tub rotatably supported in the outer tub, having an opening with a bottom and storing laundry, and rotating the inner tub. A washing machine equipped with a driving means for causing the inner tub to have a ventilation hole at the bottom thereof, and a plurality of blades provided substantially radially on an outer wall surface at the bottom of the inner tub. The washing machine according to claim 1, wherein the plurality of blades are formed integrally with the inner tub. The washing machine according to claim 1, wherein a casing portion for gradually rectifying the air flow due to the rotation of the inner tub is projected from the bottom of the outer tub so as to include a plurality of blades. The washing machine according to claim 3, wherein at least one of the plurality of blades and the casing is formed integrally with the inner tub or the outer tub, respectively. The washing machine according to any one of claims 1 to 4, wherein a rotatable stirring blade is provided at a bottom portion in the inner tub, and a plurality of ventilation holes are provided in the stirring blade. The washing machine according to any one of claims 3 to 5, wherein an outlet of the casing portion is provided in the outer tub, and an outlet is provided in the outer tub so as to face the outlet. The washing machine according to any one of claims 3 to 5, wherein an exhaust passage communicating with the outlet of the casing portion is provided, and exhaust ports communicating with each other are provided inside and outside the casing portion.

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