JPH08117485A - Washing machine - Google Patents

Abstract

PURPOSE: To reduce the remaining water rate of washing without exerting any adverse influence on the washing performance. CONSTITUTION: Plural projection parts 20 which projects inwardly in the drum part 10b of a washing and dewatering tank 10 are formed at the drum part 10b, and increased in height toward the bottom of the washing and dewatering tank 10. At the time of washing, no more than small force operates on the washing at the upper part in the washing and dewatering tank 10 from a rotary blade 11, but the height of the projection parts 20 is low, so the movement is not impeded and the washing performance never decreases. At the time of dewatering operation, the amount of remaining water of washing nearby the wall surface of the washing and dewatering tank 10 is reducible because of the projection parts 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine for agitating laundry by rotating blades provided at the bottom of a washing / dehydrating tub for washing and rotating the washing / dehydrating tub at high speed for centrifugal dewatering. In particular, the present invention relates to a means for reducing the residual water content after dehydration of laundry located near the wall surface of a washing / dehydrating tub.

[0002]

2. Description of the Related Art Reduction of residual water content (improvement of dehydration rate) of laundry after dehydration in a centrifugal dehydration washing machine is generally carried out by increasing the rotation speed of the dehydration tank or extending the dehydration time. . The residual water ratio, which is the ratio of the mass of water remaining in the cloth after dehydration to the mass of the dry cloth, tends to rise sharply in the vicinity of the wall surface of the dehydration tank, as shown in FIG. It does not change even if the rotation speed or dehydration time is changed.

[0003] Centrifugal dehydration in which the dehydration tank is rotated is to move the water content in the laundry to the wall surface side of the dehydration tank by the centrifugal force caused by the rotation of the dehydration tank, and to discharge it through the dehydration holes provided in the wall surface of the dehydration tank. Performed by. A large number of capillaries of fibers constituting the laundry are formed in the laundry, and a force (a force in a direction opposite to the centrifugal force) to retain water in the laundry is exerted by the capillary action. . When the water content in the fibers (capillaries) decreases due to the dehydration action, the centrifugal force acting on the water becomes smaller, and at last, the water retention capacity due to the capillary action of the fibers is balanced, and more water is discharged outside the fibers (dehydration). )
It will not be done. Therefore, a large amount of washing water is retained in the laundry near the wall surface of the dehydration tub due to the capillary action, and the residual water rate is rapidly increased.

Therefore, in order to reduce the residual water content of the laundry located near the wall surface of the washing / dehydrating tub, conventionally, a washing / dehydrating tub having an inner wall surface with irregularities has been proposed. FIG.
3 is a vertical sectional side view of the washing / dehydrating tank, and FIG. 14 is a cross-sectional plan view taken in the direction of arrow Z in FIG. This washing and dewatering tank 10
On the inner wall surface, a plurality of protrusions 17 extending in the up-down direction are uniformly formed with an inclined surface at a constant height. In the washing / dehydrating tank 10 having such a shape, during centrifugal dehydration,
The washing water contained in the laundry 50 is the washing and dehydrating tub 10.
Move toward the inner wall surface of. Then, on the inclined surface of the protruding portion 17 with which the laundry 50 contacts, a centrifugal force component of centrifugal force acts on the washing water, and the washing water is formed between the protruding portions 17. It moves along the inner wall surface (inclined surface) toward the valley portion 18 and is discharged from the dehydration hole 12. Since the capillary state is maintained in this area due to the contact state between the protrusion 17 and the laundry 50, the movement of the washing water is smooth, and the residual water amount of the laundry 50 in the area contacting the surface of the protrusion 17 is reduced. The residual water rate near the wall surface of the dehydration tank decreases as shown by the alternate long and short dash line in FIG. Such a washing machine
It is described in JP-A-56-91797.

Further, Japanese Patent Laid-Open No. 58-109092 discloses a washing machine in which a protruding portion 16 is provided in a lower region of an inner wall surface of the washing / dehydrating tub 10 to improve washing performance. An outline of the washing and dehydrating tub 10 of this washing machine is shown in FIGS. 15 and 16. On the inner wall surface of the washing / dehydrating tub 10, a plurality of rectangular protrusions 16 in the vertical direction, which are close to the peripheral edge of the rotary blade 11, bulge inward from the bottom to the middle. The projecting portion 16 forms a water passage through which the washing water discharged from the back blade of the rotary blade 11 rises to secure the circulation of the washing water, and the laundry 50
It works to improve the movement of and improve the washing performance.

Further, when the washing / dehydrating tub 10 is made of stainless steel, as shown in FIG. 17, the washing / dehydrating tub 10 has a bottom body 10a having an upper end edge and a cylindrical body 10b having a lower end edge. Are joined together by a caulking portion 10d, and a body portion 10b near the caulking portion 10d has a simple cylindrical shape.

[0007]

As shown in FIGS. 13 and 14, a washing / dehydrating tub 10 having a protrusion 17 having an inclined surface is provided near the wall surface of the dewatering tub without changing the spinning speed or the spinning time. It is possible to reduce the residual water rate of the laundry 50, and it is possible to make the residual water rate of the laundry 50 uniform. The residual water rate is
The larger the volume of the projecting portion 17, the smaller it becomes. Therefore, when considering the dehydration performance, it is more effective that the projecting portion 17 is as large as possible. However, in consideration of the washing performance, if the inner wall surface of the washing / dehydrating tub 10 has a large protrusion 17 directed toward the inside of the tub, the movement of the laundry 50 in the washing / dehydrating tub 10 is hindered. Not in a favorable condition. In particular, the laundry 50 in the upper area of the washing / dehydrating tub 10 has a rotor 11
The stirring force from the is difficult to be transmitted, and the movement of the laundry 50 is significantly reduced. Therefore, the circulation movement of the laundry 50 in the washing / dehydrating tub 10 is reduced, it becomes difficult to wash the entire laundry 50 on average, and uneven washing occurs.

Further, as shown in FIGS. 15 and 16,
Washing / dehydrating tank 10 having a rectangular protrusion 16 in the lower region
Because the projecting portion 16 projects at a portion near the rotary blade 11 at the bottom of the washing / dehydrating tub 10, the washing / dehydrating tub 10 has a protruding portion formed over the entire inner wall surface of the washing / dehydrating tub 10. The decrease in the movement of the object 50 can be reduced. However, since the rectangular protrusion 16 provided so as to form a circulation passage for the washing water between them needs to be protruded high, and its cross-sectional shape is also rectangular, it contacts the laundry 50 for dehydration during dehydration. It is not possible to provide an inclined surface for guiding the washing water toward the drain hole. Moreover, the laundry 50 has a high protrusion 1.
Since it is pressed by 6 and cannot follow the inner wall surface and forms a space with the inner wall surface of the washing / dehydrating tub 10, the substantial radius of the washing / dehydrating tub 10 is reduced from R to R1. This is equivalent to what is said, and there is also a problem that the dehydration performance decreases.

On the other hand, the washing / dehydrating tub 10 made of stainless steel shown in FIG.
In order to secure the reliability of d, the body portion 10b has a simple cylindrical shape in the vicinity of the crimped portion 10d. Therefore, the dehydration hole 12 is formed in the body 10b near the caulking portion 10d.
Since the protruding portion 17 cannot be molded, the caulking portion 10
It was difficult to reduce the residual water amount near d.

An object of the present invention is to provide a washing machine having enhanced dewatering performance while suppressing deterioration of washing performance.

Another object of the present invention is to provide a washing machine capable of reducing the residual water content of the laundry near the inner wall surface of the washing / dehydrating tub.

Still another object of the present invention is to reduce the amount of residual water in the vicinity of the caulking part in a stainless steel washing / dehydrating tank formed by connecting the bottom part and the body part with the caulking part. To provide a machine.

[0013]

One of the features of the present invention is as follows.
A plurality of protrusions having an inclined surface that bulges toward the inside of the tank toward the inside of the tub and guides moisture by contacting the laundry at the time of dehydration, and a dehydration hole is provided between the protrusions. In a washing machine equipped with a dehydrating tub, a rotary blade provided at a bottom portion of the washing / dehydrating tub, and a drive device for rotating the rotary wing and / or the washing / dehydrating tub, the protrusion is provided for the laundry. The action amount of the inclined surface is increased as it approaches the bottom of the washing / dehydrating tub.

Another feature of the present invention is that it has an inclined surface formed on the body wall surface with a plurality of recesses that bulge outward, and guides water by contacting the laundry during dehydration. In a washing machine equipped with a washing / dehydrating tub provided with a dehydrating hole, a rotary blade provided at the bottom of the washing / dehydrating tub, and a drive device for rotating the rotary blade and / or the washing / dehydrating tub, The inclined surface is such that the amount of action on the laundry is increased toward the bottom of the washing / dehydrating tub.

Still another feature of the present invention is that a washing / dehydrating tub with a dehydrating hole, the bottom of which is joined to the lower end of a tubular body by caulking, and a rotation provided at the bottom of the washing / dehydrating tub. In a washing machine equipped with a wing and a drive device for rotating the rotary wing and / or the washing / dehydrating tub, an inner diameter of a caulking joint portion of the washing / dehydrating tub is smaller than an inner diameter of a body portion in which the lowest dehydration hole is located. And the continuous change between the caulking joint and the dehydration hole position.

[0016]

The inclined surface formed on the inner wall surface of the washing tub and in contact with the laundry guides the washing water moved to the outer peripheral portion of the laundry toward the discharge hole located downstream of the inclined surface, and the remaining portion of the portion. Reduce the water rate. The protrusions or recesses that form this inclined surface are
It works to impede the movement of the laundry that is agitated by the rotor and moves. However, since the inclined surface due to the unevenness of the inner wall surface of the washing / dehydrating tub located above the rotary blades has a smaller action amount than the inclined surface due to the unevenness located below the rotary blades, the laundry is washed. Also, the effect of hindering the movement of is reduced, so that uneven washing does not occur.

Further, by making the inner diameter of the caulking joint portion of the washing / dehydrating tank smaller than the inner diameter of the body portion where the lowest dehydration hole is located, an inclined surface extending from the caulking joint portion to the lowest dehydration hole is formed. The dehydration from the laundry located at the bottom moves along the inclined surface in the dehydration hole direction and is discharged from the dehydration hole. Therefore, the residual water content of the laundry located at the bottom of the washing / dehydrating tub can be reduced.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a first washing machine according to the present invention.
FIG. 1 is a vertical sectional side view, and FIG. 2 is a cross-sectional plan view (a Z arrow view of FIG. 1) showing a protruding portion of a wall surface of the washing / dehydrating tub.

The exterior is composed of an outer frame 1 and a lid 2 which is provided on the upper edge of the outer frame 1 so as to be freely opened and closed. The outer tub 3, which is a water receiving tub, is provided with a tub cover 3a at its upper edge, and engages with the lower end of a hanging rod 4b hanging from the four corners of the upper portion of the outer frame 1 via a buffer member 4a. It is supported in a suspended state in the frame 1 and accommodates washing water in the washing process and rinsing water in the rinsing process (hereinafter referred to as washing water).

A drive motor 6 attached to a drive unit base 5 installed on the outer side of the bottom wall of the outer tub 3 is connected by a belt 8 and a transmission device 7 which is a combination of a gear reduction mechanism and a clutch mechanism. Concentric dual output shafts 7a, 7
b is a watertight state that penetrates through the bottom wall of the outer tank 3
Protrude into. The transmission device 7 rotates the inner output shaft 7a in the forward and reverse directions while maintaining the outer output shaft 7b in a stationary state in the washing process and the rinsing process, and in the dehydration process, the inner and outer output shafts 7a, 7a.
With b together, rotate at a high speed of 700 to 1100 rpm.

The washing and dehydrating tub 1 installed inside the outer tub 3
0 is mainly composed of a bottom body portion 10a and a body portion 10b, and a rotary wing 11 is provided at a central portion of the bottom body portion 10a.
The balancer 10c is mounted on the upper edge of the body 10b. A hub 13 coupled to the outer output shaft 7b is joined to the outer (lower) surface of the bottom body portion 10a of the washing / dehydrating tub 10, and the rotor 11 is joined to the shaft end of the inner output shaft 7a.

The body portion 10b of the washing / dehydrating tub 10 has a plurality of protrusions 2 bulging toward the inside of the body portion 10b.
0 is formed. The width W is between the adjacent protrusions 20.
A valley portion 21 of r is formed. Dehydration holes 12 are provided in the valley portion 21 at appropriate intervals.

The cross-sectional plan view of the protrusion 20 is formed so that the distance L from the center O of the washing / dehydrating tub 10 to the protrusion 20 changes depending on the angle. That is, the distance L
Is the smallest at the central portion (top) of the protrusion 20 and becomes longer as it approaches the hem of the protrusion 20 to form an inclined surface with which the laundry 50 being dehydrated comes into contact. Actually, the triangular shape as shown in this embodiment and the arc shape as shown in another embodiment described later are practical in view of easiness of processing. The height of the projecting portion 20 is close to the stirring blade 11 and the washing and dewatering tub 10 in which the laundry 50 is likely to concentrate during dewatering.
The higher the area is, the higher the area is, and the lower area is h2.
(H1 <h2).

The drainage port 3a formed on the bottom wall of the outer tub 3 is connected to the drainage hose 15 through the drainage valve 14 to form a drainage system, and the power transmission mode to the inner and outer output shafts 7a and 7b is switched. An on / off operation of the clutch mechanism in the transmission device 7 is performed by a solenoid coil 9. Since the water supply system is the same as that of the conventional fully automatic washing machine, its illustration is omitted and the operation control of the drive motor 6 is omitted.
The same applies to the control device that controls the water supply / drainage system and the solenoid coil 9 that operates the transmission device 7.

In the above-described construction, in the dehydration step, the washing water filled in the outer tub 3 to a predetermined water level is drained from the drain port 3a through the drain hose 15 after opening the drain valve 14, and then the washing / dehydrating tub. The drive motor 6 drives the rotor 10 and the rotor 11 together so that they rotate at a high speed of 700 to 1100 rpm.

In this dehydration step, the laundry 50 rotates together with the washing / dehydrating tub 10 and is pressed against the inner wall surface of the body portion 10b of the washing / dehydrating tub 10 by its centrifugal force. At this time, the centrifugal force similarly acts on the wash water contained in the laundry 50, so that the wash water moves inside the laundry 50 and collects on the inner wall surface of the washing / dehydrating tub 10 and then from the dehydration hole 12. It is discharged to the outer tub 3 and drained from the drain hose 15 through the drain port 3a.

Explaining the condition of the washing water during this dehydration step, the washing water remaining in the relatively wide gap in the laundry 50 is centrifugally dehydrated in a short time. Then, the washing water remaining in the many capillaries formed in the fibers of the laundry 50 and between the fibers gradually moves in the capillaries to move to the outermost peripheral portion of the laundry 50 (near the inner wall surface of the body portion 10b). ). In the capillary portion, a force (a force in the direction opposite to the centrifugal force) for holding the wash water acts by the capillary action. Therefore, the dehydration action proceeds when the centrifugal force acting on the washing water in the capillary is larger than the force due to the capillary action, but when the centrifugal force and the force due to the capillary action are balanced, the dehydration does not proceed any further.
Therefore, when water is observed in the laundry 50 after the dehydration process, a large amount of washing water remains in the laundry 50 located near the inner wall surface of the washing / dehydrating tub 10 due to a capillary action.

Therefore, when the laundry 50 is partially inclined by the protrusions 20 within the range in which the capillary action of the fibers is maintained, the washing water in the laundry that comes into contact with the protrusions 20 is centrifuged. The force C acts on the protrusion 20 including the component force Ci in the inclined surface direction and the component force Cr in the inclined surface and the vertical direction. Then, the component force Ci in the direction of the inclined surface causes the washing water to flow into the laundry 50 or the protruding portion 20.
Through the slight gap (capillary) formed in the contact portion between the laundry and the laundry 50, and moves to the valley portion 21 between the protrusions.
It acts so as to drain the water from the dehydration hole 12 that opens in the. That is, the residual water rate of the laundry 50 facing the valley portion 21 is the same as that when the protruding portion 20 is not provided, but the residual water amount of the laundry 50 facing the protruding portion 20 is reduced by the above action. Therefore, if the entire circumference is averaged, the residual water rate of the laundry 50 near the inner wall surface of the washing / dehydrating tub 10 can be reduced.

The inclined surface of the protrusion 20 which accelerates the dehydration action impedes the movement of the laundry 50 by the rotary blades 11 during washing, thereby lowering the washing performance.

In order to reduce such deterioration of the washing performance, the present invention adjusts the working amount of the inclined surface so that the rotary blade 11 can be washed.
The agitation force due to is strongly transmitted and the laundry 50 is concentrated in the area near the bottom where the laundry 50 is likely to concentrate at the time of dehydration, and the agitation force transmitted is weak and the area of the upper portion where the laundry 50 is less distributed at the time of dehydration is reduced. In this embodiment, this is realized by changing the height of the protrusion 20.

The height h of the protruding portion 20 is made higher in the region closer to the bottom of the washing / dehydrating tub 10 where the rotating blade 11 is located, so that the height h of the protruding portion 20 is lowered at the upper portion of the washing / dehydrating tub where the force from the rotating blade 11 is less likely to be received. are doing. Therefore, the laundry 50 located at the bottom of the washing / dehydrating tub 10 having the high protruding portion 20 is hindered by the protruding portion 20 and becomes hard to move, but a large stirring force acts from the rotating blades 11 located nearby. You can move actively because you do. Then, in a region far away from the rotary blade 11 where the transmission of the stirring force is weakened, the protrusion 20
Is low, the action of hindering the movement of the laundry 50 is also small. Therefore, the overall movement of the laundry 50 in the washing / dehydrating tub 10 is not deteriorated, and thus the washing performance is deteriorated by the protrusion 20. Never.

According to this embodiment, when the total volume of the protrusions 20 (the total amount of the inclined surface) is made equal to that of the conventional washing / dehydrating tub 10, the stirring force of the rotary blades 11 is strong during washing and the laundry is washed during dewatering. The protrusion 2 is located near the bottom where 50 easily concentrates.
0 is increased to secure the movement of the laundry 50 and reduce the residual water rate, and the protrusion 20 is lowered at the upper portion where the stirring force is weak during washing and the laundry 50 is relatively small during dehydration. Since the movement of the laundry 50 is facilitated and the deterioration of the washing performance is prevented, it is possible to improve the residual water ratio and the washing performance as a whole. In particular, when washing or dewatering a small amount of the laundry 50 compared to the capacity of the washing / dehydrating tub 10, since the laundry 50 is concentrated in the lower part of the washing / dehydrating tub 10, such an effect becomes remarkable. .

FIG. 3 shows an example of the result of a dehydration experiment using cotton as a test cloth in order to determine the shape of the protruding portion 20. As shown in FIG. 3A, the residual water ratio sharply increases in a region where the distance from the inner wall surface of the washing / dehydrating tank 10 is about 10 mm, and tends to be a substantially constant value in a portion further away. It can be seen that there is a large amount of washing water retained by the capillary action in the portion (laundry 50) located within 10 mm from the inner wall surface. When the protrusion 20 is provided on the inner wall surface of the washing / dehydrating tub 10, the residual water ratio of the laundry 50 near the wall decreases, but when the distance from the wall is 10 mm or more, the difference in residual water ratio due to the presence or absence of the protrusion 20. Disappears.

FIG. 3B shows the relationship between the protruding volume of the protruding portion 20 and the residual water rate. The sectional shape and dimensions of the protrusion 20 are as shown in the drawing. The larger the volume of the protrusions 20 is, the lower the residual water ratio is, but the volume of the protrusions 20 is 39 cm ³
There is almost no difference in the residual water ratio between (height 10 mm) and 68 cm ³ (height 17.4 mm). This means that there is no difference in the residual water ratio when the distance from the inner wall surface of the washing / dehydrating tank 10 is 10 mm or more, and even if the protrusion 20 having a higher height is provided, the effect of reducing the residual water ratio can hardly be expected. To do.
From the above, it was found that the height of the protruding portion 20 is sufficient if it is as high as the range where a large amount of washing water exists due to the capillary action of the fibers.

The range in which a large amount of washing water exists due to the capillary action of the fibers largely changes depending on the type of fibers, the state of the fibers, and the amount of laundry. For example, FIG. 12 shows the experimental results when the same cotton sample cloth as in FIG. 3 is used and the amount of cloth is about three times. In this case, the residual water ratio increases within about 15 mm from the inner wall surface. There is. Since there are few fibers having a value larger than that of cotton, it is sufficient for the height of the protrusion 20 to be 15 mm at the maximum. Further, the width Wr of the valley portion 21 between the protruding portions is
Since it is necessary for the laundry 50 to come into contact with the inclined surface of the protruding portion 20, about 10 mm was optimal.

On the other hand, from the viewpoint of washing performance, the maximum height of the protruding portion 20 is such that when the width Wp of the protruding portion 20 is 80 mm, h1 is 7.5 mm, h2 is 11.5 mm, and the protruding portion 2 is
When the width Wp of 0 is 40, h1 is 4 mm and h2 is 10
If it was mm, the movement of the laundry 50 was almost the same as that without the protrusion 20, and the washing performance was not changed.

FIG. 4 and FIG. 5 show a second washing machine according to the present invention.
FIG. 4 is a vertical sectional side view of the washing / dehydrating tub, and FIG. 5 is a cross-sectional plan view (a Z arrow view of FIG. 4) showing a protruding portion of a wall surface of the washing / dehydrating tub. The same parts (portions) as those in the first embodiment are designated by the same reference numerals, and the duplicated description will be omitted.

The feature of this embodiment is that the body portion 10b of the washing / dehydrating tub 10 is provided with a recessed portion 22 which bulges outwardly of the body portion 10b so that the depth thereof is deeper in the lower portion than in the upper portion. The dehydration hole 12a is provided at the bottom of the recess 22.

Since the concave portion 22 bulges outward, the capacity of the washing / dehydrating tub 10 does not decrease as in the case of a protrusion bulging inward from the wall surface, and conversely the washing is performed. There is also an advantage that the capacity of the dehydration tank 10 is increased. Further, since the bottom of the recess 22 is the same as the radius of the washing / dehydrating tub 10 is increased by h1 at the upper part and h2 at the lower part, the centrifugal force is increased and the dewatering performance can be improved. .

Therefore, also in this embodiment, as in the case of the first embodiment, the dewatering and washing tub 10 does not deteriorate in washing performance.
It is possible to reduce the residual water amount of the laundry 50 near the inner wall surface. The depths h1 and h2 and the width Wp of the recess 22 are optimally the same values as in the first embodiment. Further, it is more advantageous in terms of dehydration performance to dispose the recesses 22 so that the ridges 22a between the recesses 22 do not have arcuate portions concentric with the body 10b.

6 and 7 show a third washing machine according to the present invention.
FIG. 6 is a vertical side view of the washing / dehydrating tub, and FIG. 7 is a cross-sectional plan view (a Z arrow view of FIG. 6) showing a protruding portion of an inner wall surface of the washing / dehydrating tub. The same parts (portions) as those in the above-described embodiment are designated by the same reference numerals, and the duplicated description will be omitted.

The feature of this embodiment is that the body portion 10b of the washing / dehydrating tank 10 bulges toward the inside of the body portion 10b.
This is because the protrusions 20a to 20c divided into a plurality of pieces in the vertical direction are provided. This embodiment is an example in which it is divided into three pieces in the vertical direction. The heights of the protrusions 20a to 20c are h1 <h2 <so that the upper protrusion 20a is h1, the central protrusion 20b is h2, the lower protrusion 20c is h3, and the lower protrusions are higher. The relationship is h3. Further, the protruding portions 20a, 20b (20
b, 20c), a valley portion 21b having a width Wv is formed,
A valley portion 21a having a width Wr is formed between the protruding portions 20a (20b, 20c) adjacent to each other in the circumferential direction. Each protrusion 2
The shapes of 0a to 20c are preferably set in the same manner as in the case of the first embodiment from the viewpoint of washing and dewatering performance.
The width Wv of b is preferably about 10 mm, like the valley 21a.

Since the valley portion 21b is formed continuously in the circumferential direction of the body portion 10b, when the washing / dehydrating tub 10 is made of stainless steel, it is centrifugal compared to the case where the protruding portion is continuous in the vertical direction. There is an effect that the strength of the body portion 10b against the force is improved. Therefore, if the washing capacity is the same, it is possible to reduce the plate thickness of stainless steel,
The weight of the washing / dehydrating tub 10 can be reduced. Alternatively, a large-diameter (large-capacity) washing / dehydrating tub 10 can be obtained by using stainless steel having the same plate thickness.

FIG. 8 is a vertical sectional side view of a washing / dehydrating tub showing a fourth embodiment of a washing machine according to the present invention. Omit it.

The feature of this embodiment is that the height and the vertical length of the protrusions 20d to 20f formed by dividing the body portion 10b of the washing / dehydrating tub 10 into a plurality of pieces in the vertical direction are used as the body portion 1.
The lower part of 0b is made larger. This embodiment shows an example in which it is divided into three pieces in the vertical direction. Each protrusion 2
The height of 0d to 20f and the length in the vertical direction are
The upper protrusion 20d is h1, V1, and the central protrusion 20 is
e is h2, V2, and the lower protrusion 20f is h3, V3. In the upper area of the washing / dehydrating tank 10 that is far away from the rotor blades 11 and is less likely to receive stirring force (weak stirring force), the height h1 of the protrusion 20d and the vertical length V1 are small, and the rotor blades 11 are located close to each other. In the lower region of the washing / dehydrating tub 10 where strong stirring force acts, the height h of the protrusion 20f is h.
3 and the vertical length V3 are large (h1 <h2 <h3,
V1 <V2 <V3).

In this way, compared to the washing / dehydrating tub 10 in which only the protrusions of the same area are lower in height, the laundry 50 is more easily moved and the washing performance of the protrusions is improved. Less decrease. The washing / dehydrating tub 10 having a shape in which the projecting portions are divided in the vertical direction as in this embodiment and the third embodiment can be easily formed in the case of stainless steel, but is difficult in the plastic molding. Therefore, it is particularly suitable for the washing and dehydrating tub 10 made of stainless steel.

FIG. 9 is a cross-sectional plan view of the protrusion 20 of the washing / dehydrating tub 10 showing the fifth embodiment of the washing machine according to the present invention. (A) is a cross-sectional plan view of the protrusion 20 located in the upper region of the body 10b, (B) is a cross-sectional plan view of the protrusion 20 located in the central region of the body 10b, and (C) is the body 1
2b shows a cross-sectional plan view of the protrusion 20 located in the lower region 0b. The feature of this embodiment is that the inclined surface of the protrusion 20 and the valley 2 are
The angle θ with respect to the first surface (tangential direction) is larger in the projecting portion 20 located in the lower region of the body portion 10b (θ1 <θ2 <θ3). The higher the area of the washing / dehydrating tub 10 in which the stirring force transmitted from the rotary blades 11 is small, the more the protrusion 2
Since the angle θ between 0 and the valley 21 is small, the laundry 50
The resistance against movement in the circumferential direction along the inner wall surface of the washing / dehydrating tub 10 becomes small, and the degree of hindrance to the movement of the laundry 50 becomes small. On the other hand, in the lower region of the washing / dehydrating tub 10, even if the angle θ formed by the protruding portion 20 and the valley portion 21 is large, the stirring force transmitted from the rotating blades 11 located nearby is applied to the laundry 50 in that region. Since it has a great effect, the movement of the laundry 50 is not stagnant.

Therefore, the projecting portion 20 is extremely effective in reducing the residual water rate and reducing the deterioration of the washing performance.

The angle θ formed by the protrusion 20 and the valley 21 is 20 in the upper region of the body portion 10b when the cross-sectional plane shape of the protrusion 20 is an arc shape as shown in this embodiment.
.Degree., And preferably 50.degree. Or less in the lower region of the body portion 10b.
Further, when the cross-sectional plane shape of the projecting portion 20 is triangular, it is preferable that the upper region of the body portion 10b be 13 ° and the lower region of the body portion 10b be 26 ° or less.

FIG. 10 is a vertical sectional side view of a washing / dehydrating tub 10 showing a sixth embodiment of the washing machine according to the present invention. Is omitted.

The feature of this embodiment is that the lower portion of the protrusion 20 formed on the body portion 10b of the washing / dehydrating tank 10 is formed more densely than the upper portion. Since the number of protrusions 20 is small in the upper region of the washing / dehydrating tub 10 where the stirring force from the rotary blades 11 is difficult to apply, the movement of the laundry 50 does not deteriorate. Further, in the lower region of the washing / dehydrating tub 10 having the rotary blades 11 nearby, even if the number of the protrusions 20 is large and the resistance against the movement of the laundry 50 is large, a large stirring force acts on the region. The movement of the laundry 50 does not stagnate.

Therefore, the washing performance does not deteriorate due to the protrusion 20. This embodiment is particularly effective in reducing the amount of residual water for a small amount of laundry 50 such that the laundry 50 is concentrated in the lower region of the washing / dehydrating tub 10 during dewatering.

FIG. 11 is a vertical sectional side view of a main part of a washing / dehydrating tub showing a seventh embodiment of the washing machine according to the present invention. The description is omitted.

In the washing / dehydrating tub 10 made of stainless steel, the bottom body portion 10a and the body portion 10b are joined by caulking connection 10d. The inner diameter (φD1) of the body portion 10b in which the lowest dehydration hole 12b is located in the dehydration hole group 12 formed in the body portion 10b is the inner diameter (φD2) of the caulking coupling portion 10d.
Is bigger than The body portion 10e is narrowed so that the inner diameter between the region where the lowest dehydration hole 12b is formed and the caulking joint portion 10d continuously changes.

The washing / dehydrating tub 10 constructed in this way
Since it has the same structure as that in the lower area of the dehydration hole 12b, which has a continuous projection (inclined surface) in the circumferential direction, the bottom body portion 10a to the body portion 10e are formed in the same manner as in the above embodiment. The washing water in the laundry 50 located in the lower end region flows as shown by an arrow in the figure by the centrifugal component of the centrifugal force and is discharged from the dehydration hole 12b, so that the residual water amount in the laundry 50 decreases. To do. In particular, when dehydrating a small amount of laundry 50, the laundry 50
The body portion 10e comes into close contact with the caulking portion 10d.
The inclination of the lower end region of the has a great effect on the reduction of the residual water content.

[0057]

INDUSTRIAL APPLICABILITY The present invention provides an inclined surface for reducing the residual water ratio,
Since the inclined surface due to the unevenness of the inner wall surface of the washing / dehydrating tub, which is located higher than the rotary blade, has a smaller action amount than the inclined surface due to the unevenness located lower than the rotary blade, It is possible to provide a washing machine that has improved dehydration performance while preventing the movement of the laundry from being impaired and impairing the washing performance.

The residual water content of the laundry increases in the vicinity of the inner wall surface of the washing / dehydrating tub. However, the effect of the inclined surface is increased in the lower area where the laundry is easily concentrated, and the inclined surface is increased in the upper area where the laundry is less concentrated. Since the action is reduced, the residual water content of the laundry can be uniformly reduced in the vicinity of the inner wall surface of the washing / dehydrating tub.

Further, since the slanted surface from the caulking joint portion of the bottom body and the body portion of the washing / dehydrating tank to the lowest dehydration hole area is used as an inclined surface to assist dewatering, the residual water amount near the caulking portion is reduced. It is possible to obtain a washing and dehydrating tub made of stainless steel.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a first embodiment of a washing machine according to the present invention.

2 is a cross-sectional plan view (view from arrow Z in FIG. 1) showing a protrusion of a washing / dehydrating tub of the washing machine shown in FIG.

FIG. 3 is an example of an experimental result showing a relationship between a shape of a protrusion and a residual water rate.

FIG. 4 is a vertical sectional side view of a washing / dehydrating tub showing a second embodiment of the washing machine according to the present invention.

5 is a cross-sectional plan view (view from arrow Z in FIG. 4) showing a protruding portion of the washing / dehydrating tub of the washing machine shown in FIG. 4;

FIG. 6 is a vertical sectional side view of a washing / dehydrating tub showing a third embodiment of the washing machine according to the present invention.

7 is a cross-sectional plan view (a view taken in the direction of arrow Z in FIG. 6) showing a protruding portion of the washing / dehydrating tub of the washing machine shown in FIG.

FIG. 8 is a vertical sectional side view of a washing / dehydrating tub showing a fourth embodiment of the washing machine according to the present invention.

FIG. 9 is a cross-sectional side view of a protrusion of a washing / dehydrating tub showing a fifth embodiment of the washing machine according to the present invention.

FIG. 10 is a vertical sectional side view of a washing / dehydrating tub showing a sixth embodiment of the washing machine according to the present invention.

FIG. 11 is a vertical cross-sectional side view of essential parts of a washing / dehydrating tub showing a seventh embodiment of the washing machine according to the present invention.

FIG. 12 is an example of an experimental result showing the relationship between the dehydration condition and the residual water rate.

FIG. 13 is a vertical sectional side view of a washing / dehydrating tub in a conventional washing machine.

14 is a cross-sectional plan view showing a protruding portion of the washing / dehydrating tub in the conventional washing machine shown in FIG.
Is.

FIG. 15 is a vertical sectional side view of a washing / dehydrating tub in a conventional washing machine.

16 is a cross-sectional plan view (view from arrow Z in FIG. 15) showing a protruding portion of the washing / dehydrating tub of the washing machine shown in FIG.

FIG. 17 is a vertical cross-sectional side view of essential parts of a washing / dehydrating tub in a conventional washing machine.

[Explanation of symbols]

10 ... Washing / dehydrating tank, 10a ... Body part, 10b ... Bottom part, 11 ... Rotor blade, 12 ... Dehydration hole, 20, 22 ... Projection part, 21 ... Valley part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Mitsuyuki Togashi, 502 Jinritsu-cho, Tsuchiura-shi, Ibaraki Machinery Research Institute, Hiritsu Manufacturing Co., Ltd. No. Nitate Taga Engineering Co., Ltd. (72) Inventor Tamotsu Kamori 1-1-1, Higashitaga-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Living Equipment Division (72) Inventor Tomonori Kamano Higashi-shi, Ibaraki 1-1-1 Tagamachi, Ltd. Living Equipment Division, Hitachi, Ltd.

Claims (13)

[Claims] 1. A plurality of protrusions having an inclined surface which bulges toward the inside of the tank toward the inside of the tub and guides moisture by contacting the laundry during dehydration, and dehydration holes are provided between the protrusions. In a washing machine provided with a washing / dehydrating tub provided, a rotary wing provided at a bottom portion of the washing / dehydrating tub, and a drive device for rotating the rotary wing and / or the washing / dehydrating tub, the protrusion is provided. A washing machine characterized in that the amount of action of the inclined surface with respect to the laundry is increased toward the bottom of the washing / dehydrating tub. 2. The washing machine according to claim 1, wherein the height of the protrusion is increased toward a portion closer to the bottom of the washing / dehydrating tub. 3. The washing machine according to claim 1, wherein the protrusion is divided into a plurality of pieces in the vertical direction. 4. The washing machine according to claim 3, wherein a vertical length of each of the vertically divided protrusions is longer at a position closer to the bottom of the washing / dehydrating tub. 5. The washing machine according to claim 3, wherein the protrusions divided in the vertical direction are arranged closer to each other in a region closer to the bottom of the washing / dehydrating tub. 6. The washing machine according to claim 1, wherein an angle formed by the inclined surface of the projecting portion and a wall surface of a body portion of the washing / dehydrating tub is made larger toward a bottom of the washing / dehydrating tub. 7. An inclined surface which is formed by a plurality of recesses bulging outwardly on the body wall surface and guides water by contacting the laundry during dehydration, and a dehydration hole is provided at the bottom of this recess. A washing / dehydrating tub, a rotary blade provided at the bottom of the washing / dehydrating tub, and a drive device for rotating the rotary wing and / or the washing / dehydrating tub, wherein the inclined surface is A washing machine characterized in that the amount of action on laundry is increased toward the bottom of the washing / dehydrating tub. 8. The washing machine according to claim 7, wherein the depth of the recess is increased toward a portion closer to the bottom of the washing / dehydrating tub. 9. The recess according to claim 7 or 8,
A washing machine characterized by being divided into a plurality of pieces in the vertical direction. 10. The washing machine according to claim 7, wherein the vertical length of the vertically divided recesses is longer at a position closer to the bottom of the washing / dehydrating tub. 11. The washing machine according to claim 7, wherein the vertically divided recesses are arranged closer to each other in a region closer to the bottom of the washing / dehydrating tub. 12. The washing machine according to claim 7, wherein an angle formed by the inclined surface and a wall surface of a body portion of the washing / dehydrating tub is increased as it is closer to a bottom of the washing / dehydrating tub. 13. A washing / dehydrating tub with a dehydrating hole, the bottom of which is joined to the lower end of a tubular body by caulking, a rotary blade provided at the bottom of the washing / dehydrating tub, and the rotary blade and And / or a washing machine equipped with a drive device for rotating the washing / dehydrating tub, wherein the inner diameter of the caulking joint portion of the washing / dehydrating tank is smaller than the inner diameter of the body portion in which the lowest dehydration hole is located, and A washing machine characterized by being continuously changed between hole positions.