JPH0771597B2 - Washing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a so-called one-tank type dehydration washing machine having rotating blades rotatably arranged on the inner bottom of a washing tub which also serves as a dehydration tub.

[0002]

2. Description of the Related Art As a conventional one-tank type dewatering washing machine, there are two washing methods of a stirring type and a spiral type. In the stirring type washing machine, the stirring blades are normally and reversely rotated at a rotation angle of 180 ° to 270 °. The reversal cycle of this stirring blade is 50 per minute
It is set to be ~ 100 cycles.

On the other hand, in a spiral washing machine, the rotary blades are 40
At a rotation speed of 0 rpm to 780 rpm, for example, 27 seconds in the forward direction,
It has been operating for 3 seconds after resting for 27 seconds in the opposite direction.

Further, Japanese Patent Application Laid-Open No. 53-14973 proposes to rotate the rotor blades in the forward and reverse directions in a short period of about 3 seconds for a relatively short time near the end of the washing and rinsing steps.

In the rinsing process and the wool washing process, the operation time of the rotor blades in the forward and reverse directions, so-called motor O
N time is shortened, and rotor blade down time is so-called motor OF.
It is proposed that the F time be lengthened to reduce the damage to the laundry and to save electricity.

[0006]

In the conventional stirring type washing machine, the washing power is weak although the cloth entanglement and the cloth damage are small, and the stirring blade is rotated in the forward and reverse directions at a rotation angle of one rotation or less. Since it is necessary to move the motor, it is necessary to obtain a reversing motion by rotating the motor with a complicated mechanism using a rack or a pinion.

On the other hand, in a spiral washing machine, in a normal washing process, the rotor blades continuously rotate in one direction for 20 to 30 seconds, so that the washing power is strong, but there is a drawback that the cloth is tangled and the cloth is damaged. have.

Further, at the end of the washing process and the rinsing process, the rotation of the rotary blades in the forward and reverse directions in a short cycle is for loosening the laundry entangled in the previous step, and the forward and reverse operation in this short cycle is performed. Then, the contribution to the detergency is extremely small.

Also, in rinsing and washing with wool, shortening the motor ON time and prolonging the OFF time has the effect of reducing the damage to the cloth, but the washing performance is sacrificed. Is not suitable for.

Therefore, the present invention can maintain the detergency that can be used in a general household without using a complicated reversing mechanism such as a stirring type washing machine.
Another object of the present invention is to provide a washing machine with little entanglement and damage to the cloth.

[0011]

In order to achieve the above object, a washing tub which also serves as a dehydrating tub, a rotary wing rotatably disposed on the inner bottom of the tub and having a height of about 60 mm, and a rotary wing are provided. A motor for driving, and a motor reversing type washing machine for washing by automatically reversing the motor during washing so that the rotary vanes are alternately operated at least one rotation continuously in the forward direction and the reverse direction for washing. In the above, the ratio of the inner bottom area (projected area) of the washing tub to the upper area (projected area) of the rotary blade is set in the range of approximately 1.44 to 3.24, and the operating speed of the rotary blade is set. set in the range of 100Rpm～350rpm, and together with the setting time of the forward rotation of the rotor blades and the operating time at the time of reversing (motor oN) in ranges of 0.75 to 3 seconds, and normal rotation of said rotary blades At least the motor is reversed during reverse rotation. It is characterized in that a rest time (motor OFF) necessary for rolling is provided, and the rest time is provided so as not to exceed the operating time.

[0012]

[Operation] By shortening the forward / reverse rotation cycle of the rotor,
By reducing the cloth entanglement and damage to the cloth, and increasing the area of the rotary wing relative to the inner bottom area of the washing tub, the mechanical energy transferred from the rotary wing to the laundry is increased, and even if the reversing cycle is short, The movement of the cloth is improved and the cleaning rate does not decrease. In addition, since the dwell time when the rotation direction of the rotary blade changes from normal rotation to reverse rotation and vice versa is set to a short time required for the motor to reverse, the rotation time of the rotary blade substantially occupies a predetermined washing step. The operating time becomes longer, and the desired washing rate can be obtained without increasing the washing time.

[0013]

【Example】

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

In FIGS. 1 to 3, the outer tank 2 is vibration-supported in the outer frame 1 by a vibration-proof spring 3 and a suspension rod 4.
In the outer tub 2, a washing tub 5 which also serves as a dehydrating tub is provided. A wing seat 6 is formed at the center of the inner bottom of the washing tub 5. Inside the blade seat 6, a rotary blade 8 having a rotary blade shaft 7 is arranged. Rotor 8
A plurality of back blades 9 are integrally provided on the back surface of the pump chamber 10 to form a pump chamber 10.

As shown in FIG. 2, the washing tub shaft 11 is fixed to the central portion of the outer bottom of the washing tub 5 with a screw via a flange 12. A plurality of water passage holes 13 are provided in the central wall portion 8a of the rotary blade 8. The flange 12 has a plurality of drain holes 1
3a is provided. The total opening area of the drain holes 13a is equal to the water holes 13
The total opening area is set to 1/10 or less.

As shown in FIG. 1, a bearing clutch device 14 for the rotary blade shaft 7 and the washing tub shaft 11 and a motor 15 for rotating the rotary blade 8 and the washing tub 5 are attached to the back surface of the outer tub 2. The motor 15 is fixed to the back surface of the outer tub 2 by a motor mounting plate 16.

A large number of dehydration holes 17 are provided on the side wall of the washing tub 5. As shown in FIG. 3, the inner wall of the washing tub 5 is formed into a corrugated uneven surface by alternately forming valleys 18 and peaks 19.

A water passage 20 communicating with the pump chamber 10 from the inner bottom portion of the washing tub 5 to the upper end of the valley portion 18 of the inner wall is formed by attaching a synthetic resin water passage cover 21 to the inner wall of the washing tub 5. Water from the pump chamber 10 enters through the inlet 22 of the water passage 20 and flows out through the outlet 23 of the water passage 20 due to the pumping action of the rotary blade 8. Washing tub 5
At the upper end of the fluid 24
The balance ring 25 in which is enclosed is attached. At one end of the balance ring 25, the outlet 2 of the water passage 20 is provided.
A discharge water passage 26 is formed which is in communication with 2 and has the other end opened toward the inner bottom of the washing tub 5. A bag-shaped lint filter 27 is attached to the outlet portion 26 a of the discharge water passage 26. The outlet portion 26a of the discharge water passage 26 is located above the washing water level.

The ratio of the inner diameter of the washing tub 5 to the outer diameter of the rotor 8 is set in the range of 1.2 to 1.8.

Therefore, the inner bottom area (projected area) of the washing tub 5
And the upper area of the rotor blade 8 (projected area of the rotor blade 8) is
The range is 1.44 to 3.24.

The rotation speed of the rotor 8 is 100 rpm to 35 rpm.
Set in the 0 rpm range. The motor 15 for rotating the rotor blades 8 in the forward and reverse directions has a current-carrying time during forward rotation and a current-carrying time during reverse rotation of 0.75 seconds or more and 3 seconds or less. The pause time (non-energization time) between them is controlled to be the minimum time required for reversing the motor 15, for example, 0.5 seconds. Therefore, in this embodiment, the energization time during forward rotation is 0.75 seconds to 3 seconds, the rest time during forward rotation is 0.5 seconds, and the energization time during reverse rotation is 0.75 seconds to 3 seconds and reverse rotation. Pause time 0.
Since the total of 5 seconds is 2.5 seconds or more and 7 seconds or less, the number of forward / reverse reciprocating reciprocations per minute (hereinafter referred to as an operating cycle) N of the rotary blade 8 is about 8 to 24 . The driving cycle N is
It is smaller than the conventional stirring method. That is, the operation cycle N is smaller than the conventional minimum agitation type operation cycle 50.

FIG. 4 shows a motor 15 for rotating the rotary blade 8.
Shows the unbalance amount generated in the washing tub 5 after the actual operation time in the reversing cycle, that is, the motor ON time is changed and the motor is operated for a predetermined time. It is indicated by the amount of unbalance when the rotation is reached. FIG. 5 shows the unbalance amount obtained in the same manner as in FIG. 4, but shows the unbalance amount at the time of starting dehydration. The characteristics of FIG. 4 and FIG. 5 are shown by relocating the special unbalance amount in the washing tub 5 from the swinging amplitude of the upper part of the outer tub 2 during dehydration.

In the case of a conventional spiral washing machine, for example, the number of rotations of the rotor is 400 rpm, and the actual operation time of the rotor is 27 seconds (27 seconds forward rotation-3 seconds pause-27 seconds reverse rotation), washing is performed for 15 minutes. The amount of unbalance generated after the start is 1.
3 kg, 0.9 kg at steady rotation, which is quite large.

The reason is that when the actual operating time of the rotary wing exceeds 5 seconds, the laundry rotates in the washing tub 5 while having a large relative speed with the rotary wing, and near the inner bottom of the washing tub 5. since laundry is about to rotate at substantially the same as the rotating blades, and the rotational force of Nitsu are in laundry closer to the top surface of the water tub 5 <br/> is small, the laundry in the washing tub 5 Is twisted at the top and bottom, which increases the unevenness of laundry. Therefore, when measuring the amount of unbalance generated in the actual running time of the rotor blade 8 in a short actual running time of 5 seconds or less, as shown in FIG. 4 and FIG. You can see that Especially, the actual operation time is 3
If it is less than a second, the amount of unbalance generated when the washing tub 5 is started to spin is 1.1 kg, and the amount of unbalance generated when the washing tub is spinning normally is 0.8 kg, which is considerably larger than the conventional spiral type. Can be made smaller. Therefore, the reversing cycle of the rotor blade 8 in the washing step and the rinsing step, that is, the reversing cycle of the motor 15 is required to allow the motor 15 to substantially reverse the actual operation time of 3 seconds or less during the forward rotation. The time may be set to 0.5 seconds, for example, and the actual operation time during reverse rotation may be set to 3 seconds or less. Actual operating time at forward and reverse rotation
When the length becomes extremely short, the machine that gives the laundry from the rotor 8
Since the force becomes smaller, it must be at least 0.75 seconds or more.
There is a point.

In determining the height, outer diameter and rotation speed of the rotary blade 8 and the volume (inner diameter and washing water level) of the washing tub 5 under the condition of this reversal period, the conventional centrifugal dewatering washing is adopted. Using the washing mechanism of the machine, the reversing cycle was fixed to 2 seconds for forward rotation-0.5 seconds for rest-2 seconds for reverse rotation, and the rotor blade 8
Looking at the relationship between the number of rotations and the cleaning ratio or damage ratio, the results shown in FIG. 6 were obtained. The cleaning ratio and damage ratio are
Rotational speed of the rotor is 400 rpm in the conventional spiral washing machine
The cleaning power and the cloth damage when the actual operation time is 27 seconds are set to 1 and expressed as a ratio.

As can be seen from FIG. 6, when the actual operating time shown by the solid line is 27 seconds and when the actual running time is 2 seconds shown by the alternate long and short dash line, the cleaning power is lowered as the rotating speed of the rotor blade 8 is lowered. The rate of decreasing damage is greater than the rate of decreasing cleaning power. Comparing the actual operating time of 27 seconds (solid line) with 2 seconds (dashed line), it was found to be 27 in the region where the rotational speed of the rotor blade is high.
The cleaning rate is better in seconds, but as the rotation speed decreases,
The difference is getting smaller. For example, when the actual operation time is 2 seconds and the rotation speed is 400 rpm, the cleaning power is reduced to about 78% of the conventional spiral type and the damage is reduced to 52% of the conventional spiral type. When the rotation speed is 200 rpm, the cleaning power is reduced to 48% of the conventional spiral type rotation speed of 400 rpm, and the damage is reduced to 22% of the conventional spiral type rotation speed. The difference in power is getting smaller. Therefore, in order to reduce the damage to the laundry and improve the cleaning power, the rotation speed of the rotary blade 8 is kept low, and the cleaning power is reduced as the rotation speed decreases. It is necessary to change the size and shape of the washing tub 5 to make up for it.

Therefore, the relation between the cleaning ratio and the damage ratio and the outer diameter of the rotary blade 8 is first confirmed by an experiment, and the result is as shown in FIG. In FIG. 7, the solid line shows the cleaning ratio, and the alternate long and short dash line shows the damage ratio. The experimental condition is that the inner diameter of the washing tub 5 is 39
The rotation speed of the rotor 8 is set to 0 mm, the rotation speed of the rotor 8 is set to 200 rpm, and the reversal period of the rotor 8 is set to 2 seconds for forward rotation-0.5 seconds for rest and 2 seconds for reverse rotation. The washing ratio and the damage ratio are the same as those of the conventional spiral washing machine (rotating blade outer diameter 150 mm, rotation speed 400 rpm, washing tub inner diameter 390).
mm) detergency and cloth damage. As can be seen from FIG. 7, in order to achieve a cleaning ratio of 70% or more of the conventional swirl type cleaning force, that is, a cleaning ratio of 0.7 or more, the outer diameter of the rotor blade 8 is 60 mm when the height is 60 mm. Is 215 mm or more and the height of the rotor 8 is 300 mm, the rotor 8
It can be seen that the outer diameter of the above should be 150 mm or more. In order to make it almost the same as the conventional spiral cleaning power, the rotor blade 8
When the height of the rotor blade is 60 mm, the outer diameter of the rotor blade 8 is 310 mm, and when the height of the rotor blade 8 is 300 mm, the rotor blade 8 is
The outer diameter of 210 mm should be 210 mm. Moreover, the damage when the cleaning power of the conventional spiral type is made to be almost the same can be reduced to 80% or less of the damage of the conventional spiral type, that is, the damage ratio can be suppressed to 0.8 or less. Can have been. When it is set to 70% of the conventional swirl type cleaning power, the damage ratio becomes 0.6 or less, and it is possible to greatly approach the damage ratio of the conventional stirring type.

Next, the relationship between the cleaning ratio and the damage ratio and the rotation speed of the rotary blade 8 will be confirmed by an experiment, as shown in FIG. The experimental conditions are the same as in FIG. 7, that is, the inner diameter of the washing tub 39
A rotating blade having a 0 mm diameter and a reversing cycle of the rotating blade of 2 seconds for normal rotation-0.5 seconds for rest and 2 seconds for reverse rotation and having an outer diameter of 310 mm is used.
As can be seen from FIG. 8, 70% of the conventional swirl type cleaning power
In order to secure the above cleaning power, the number of rotations of the rotary blade 8 should be 1
It is necessary to set the rotation speed of the rotary blade 8 to 35 rpm or more in order to reduce the damage as compared with the conventional spiral type.
It should be 0 rpm or less.

Next, when the relationship between the cleaning ratio and the damage ratio and the height of the rotary blade 8 is confirmed by an experiment, it becomes as shown in FIG. The experimental conditions are that the vessel inner diameter, the reversal period, and the blade rotation speed are the same as in the case of FIG. When the height of the rotary blade 8 is 60 mm, the outer diameter of the rotary blade 8 is 310 mm. When the height of the rotary blade is 300 mm, the outer diameter of the rotary blade 8 is 215 mm. As can be seen from FIG. 9 that the outer diameter of the rotary blade changes even if the height of the rotary blade 8 is changed, it can be seen that the cleaning ratio and the damage ratio both change only slightly. Therefore, it can be seen from FIGS. 7 and 9 that the cleaning ratio and the damage ratio change more greatly when the outer diameter is changed rather than the height of the rotary blade 8.

Next, ignoring the amount of unbalance generated, an experiment was conducted to find out the relationship between the actual operating time during the reversal cycle of the motor 15, that is, the actual operating time during the reversal cycle of the rotor 8 and the cleaning ratio and the damage ratio. The result is as shown in FIG. The experimental conditions are that the rotary blade 8 has a height of 60 mm, an outer diameter of 310 mm, a rotation speed of 200 rpm, and an inner diameter of the washing tub 5 is 390 mm. As can be seen from FIG. 10, even if the actual operating time of the rotor 8 is changed, the cleaning ratio and the damage ratio hardly change. That is, when the outer diameter of the rotary blade or the number of rotations is changed, the cleaning power and the cloth damage are greatly changed as shown in FIGS. 7 and 8, but the actual operation time during the reversing cycle does not have a great influence.

Next, the relationship between the cloth entanglement ratio and the actual operating time during the reversing cycle of the rotor 8 was confirmed by experiments.
become that way. Regarding the rate of cloth entanglement, here, after a series of steps of washing, rinsing and dewatering, after grasping an arbitrary piece of laundry from the washing tub 5 and squeezing it a few times, all the laundry (this experiment Then, a test cloth of the same shape is used) is disjointed, and the cloth entanglement rate is defined as 0%, and a state in which all the cleaning power is entangled so that it cannot be disentangled is defined as 100%.

Before considering the experimental results of FIG. 11, the relationship between the cloth entanglement rate and the generated unbalance amount and the relationship between the cloth reduction rate and the cloth entanglement rate are as shown in FIGS. 12 and 13. . Here, the cloth reduction rate refers to a series of steps of washing, rinsing, and dehydration using a cloth such as a towel that easily frays.
The weight reduction of the cloth when it is performed 0 times is expressed as a percentage of the initial weight.

As can be seen from FIG. 12, when the cloth entanglement ratio is reduced, the amount of unbalance generated is reduced. Further, as can be seen from FIG. 13, it can be seen that the cloth reduction rate decreases as the cloth tangling rate decreases. In addition, in FIG. 13, the solid line shows the case where each process of washing, rinsing, and dehydration was performed, and the dashed-dotted line shows the case where only the washing process was performed.

When the towel was washed with a centrifugal dehydration washing machine with a cloth reduction rate of 6%, the threads of the towel began to pop out after 30 washes, and after 100 washes, the edges of the towel were frayed, resulting in barbershops. It cannot be used. Therefore, as a washing machine suitable for barbers who use towels every day, an experiment was conducted to double the number of times the conventional towels were used, and the cloth reduction rate should be kept at 4.5% or less. I understood it. To reduce the cloth reduction rate to 4.5% or less,
As shown in FIG. 13, the cloth entanglement ratio needs to be 40% or less.

As shown in FIG. 11, the cloth entanglement ratio is greatly affected by the actual operating time of the rotor 8. As the actual operation time increases, the cloth entanglement rate increases. 40% cloth entanglement rate
In order to more than double the number of times the towel is used, it is necessary to set the actual operation time to 3 seconds or less.
I understand from. When the outer diameter of the rotor blade 8 is small and the height of the rotor blade 8 is large, the cloth tangling ratio is small, and
When the outer diameter of the rotary blade 8 is large and the height of the rotary blade 8 is small, the cloth entanglement ratio tends to increase. However, if the actual operation time is 3 seconds or less, the cloth entanglement rate can be suppressed to 40% or less.

Further, the reduction of the cloth entanglement is important from the following aspects. Even in a fully automatic washing machine, the same washing liquid is used twice,
May be divided and washed three times. When the clothes are taken in and out, the entanglement of the cloth greatly affects the workability of the person doing the laundry. That is, when the entanglement of the cloth is large, a large number of clothes containing water are attached even if one clothes is lifted. Usually, clothes such as cotton can contain about 3 to 4 times its own weight of water. For example, a total of 2 kg of clothing contains 2 kg of its own weight and 6 to 8 kg of water.
It will be a weak weight. Therefore, it is very important to suppress the entanglement of the cloth and take each piece of clothing.

Next, the relationship between the input of the motor 15 and the outer diameter of the rotary blade 8 will be examined, as shown in FIG. That is, considering the electric power situation in domestic households and the prevention of electrical noise by turning on and off the switch for automatically reversing the motor 15 in a short cycle, the motor 15
It is necessary to keep the input of less than 340W.

In order to keep the input of the motor 15 at approximately 340 W or less, when the height of the rotary blade 8 is 300 mm (approximately the same as the water level in the washing process of the washing tub 5), the outer diameter of the rotary blade 8 is set to 170 mm or less, and when the height of the rotor blade 8 is 60 mm, the outer diameter of the rotor blade 8 may be 320 mm or less.

In summary of the experimental results shown in FIGS. 4 to 16, it is preferable to set the actual operating time of the rotor 8 to 3 seconds or less in terms of the amount of unbalance generated and the cloth entangling rate. When the height of the rotor 8 is 60 mm, the cleaning ratio is 70% or more, and the input of the motor 15 is approximately 340W.
In order to keep it below, the outer diameter of the rotor 8 should be 215 mm
It may be set within the range of 320 mm.

The inner diameter of the washing tub 5 changes 390 mm, which is the experimental condition of FIGS. 4 to 14, depending on how much the rated capacity of the laundry is set. Even in this case, by setting the ratio of the inner diameter of the washing tub 5 to the outer diameter of the rotary blade 8 to be constant, the same data as in FIGS. 4 to 14 can be obtained. Therefore, in order to be able to handle various rated capacity of laundry,
When the height of the rotor 8 is set to 60 mm (preferably the actual operation time is changed from 3 seconds to 1.5 seconds), the ratio of the inner diameter of the washing tub 5 to the outer diameter of the rotor 8 is 390 mm / 215 mm or more. 39
It may be set in the range of 0 mm / 320 mm = 1.8 to 1.2. The above ratio is 1.44 to 3.24 when expressed as an area ratio.

The height of the rotary blade 8 is about 60 mm. Therefore, if the inner diameter of the washing tub 5 and the outer diameter of the rotary blade 8 are determined by the input of the motor 15, the damage ratio, and the setting of the reversal period, the washing power is compensated by increasing the outer diameter of the rotary blade 8. You can

Moreover, since the rotation time of the rotor 8 is shorter than the operating time of the rotor 8 and the rest time is set to at least the reverse rotation of the motor 15, the rotor 8 is rotated during this rest time. The momentum of the water flow circulating around the surroundings is weakened, and the rotation of the wash water and the laundry at the time of the start of the forward and reverse rotations of the rotary blade 8 becomes smooth. As a result, the rotating blade 8 can be rotated normally and reversely by reversing the motor 15 without using a complicated reversing mechanism. Further, although the laundry weakens its rotation during the rest time, the washing power is less deteriorated because it is caused by the strong water flow in the tub when the next rotor is activated.

From the viewpoint of the cleaning power alone, the shorter the dwell time at the time of reversing the rotor blade, the longer the actual cleaning operation time, and the better the cleaning.

However, if the length is set too short, the amount of water splashing increases.

That is, after the rotation of the rotary blades stops, the laundry and the washing water have inertial rotation. The inertial rotation of the wash water continues even after the inertial rotation of the laundry is stopped. In this inertial rotation, the reversing angle of the rotor is 18 in the conventional stirring type washing machine.
The angle of rotation is small at 0 ° to 270 ° (1/2 rotation to 3/4 rotation), and the rotation is low at 50 to 100 cycles per minute, so it is weak. In the washing machine of the present invention, the number of rotations of the rotary blade is 100 to 350 rpm, and the rotation angle for one rotation exceeds one rotation, so that the inertial rotation is considerable. Due to the large amount of inertial rotation, when the rotor blades rotate in the opposite direction, the laundry is twisted in the current rotation direction after the laundry is twisted by the previous rotation . At this time, since the inertia of the washing water remains, the rotation of the entire laundry and the rotation of the washing water collide weakly, causing water splash.

Since the dwell time is set before the rotary blades rotate in the opposite direction, the inertia of the wash water that collides with the rotation of the entire laundry is weakened, and the water splash is reduced.

The motor used in the washing machine is usually an induction motor using a phase advancing capacitor. If the motor pause time (motor OFF) is too short, the reversing operation often stops. From this point as well, the pause required for reversing the motor between the normal rotation and the reverse rotation of the rotor blades. It is necessary to take time.

[0048]

Industrial Applicability The present invention comprises a washing tub, a rotary blade rotatably arranged on the inner bottom of the washing tub, and a motor for driving the rotary blade, and the motor is automatically reversed. In the motor reversal type washing machine which alternately and continuously drives the rotary blades for at least one rotation in the forward direction and the reverse direction to wash, the height of the rotary blades is about 60 mm and the inner bottom area of the washing tub is the ratio of the upper area of the (projected area) and the rotary blades (projected area), set in the range of 1.44 to 3.24, to set the operating speed of the rotor blades in the range of 100Rpm～350rpm, and The operating time (motor ON) at the time of forward rotation and reverse rotation of the rotor blade is 0.75 seconds or more and 3 seconds respectively.
In addition to the following setting, a rest time (motor OFF) required for at least the reversal of the motor is provided between the normal rotation and the reverse rotation of the rotary blade, and the rest time is set not to exceed the operation time. Therefore, the following effects can be obtained.

(1) Since the motor is automatically reversed, a complicated washing mechanism such as a crank mechanism is not required, and an inexpensive and highly reliable washing machine can be obtained.

(2) A washing machine capable of maintaining a detergency that is acceptable for use in a general household, and further significantly reducing the cloth entanglement rate and making the cloth damage smaller than that of the conventional spiral type. Is obtained.

(3) Since the cloth entanglement ratio is reduced, a washing machine with low vibration noise during dehydration can be obtained. (4) Since the pause time required for the motor to reverse between the normal rotation and the reverse rotation of the rotor blade was taken, inertial rotation of the washing water colliding with the rotation of the entire laundry is weakened and water splash is reduced. .

(5) Since the idle time required for the motor to be reversed is taken, there is no malfunction in which the motor rotates in one direction, and the rotor can be regularly reversed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a main part of a centrifugal dehydration washing machine.

FIG. 2 is a vertical cross-sectional view of a washing / dehydrating tank section.

FIG. 3 is a plan view of the washing / dehydrating tub with the rotor blades removed.

FIG. 4 is a characteristic diagram of the amount of unbalance generated during steady dehydration rotation and the actual operating time of the rotor blades.

FIG. 5 is a characteristic diagram of the amount of unbalance generated at the start of dewatering and the actual operating time of the rotor blades.

FIG. 6 is a characteristic diagram of the cleaning ratio, the damage ratio, and the rotation speed of the rotary blade.

FIG. 7 is a characteristic diagram of a cleaning ratio, a damage ratio, and an outer diameter of a rotary blade.

FIG. 8 is a characteristic diagram of the cleaning ratio, the damage ratio, and the rotation speed of the rotary blade.

FIG. 9 is a characteristic diagram of the cleaning ratio, the damage ratio, and the height of the rotary blade.

FIG. 10 is a characteristic diagram of a cleaning ratio and a damage ratio, and an actual operating time during a reversing cycle of a rotor blade.

FIG. 11 is a characteristic diagram of a cloth entanglement ratio and an actual operating time during a reversing cycle of a rotor.

FIG. 12 is a characteristic diagram of the generated imbalance amount and the cloth entanglement rate.

FIG. 13 is a characteristic diagram of the cloth reduction amount and the cloth entanglement rate.

FIG. 14 is a characteristic curve diagram of an input of a motor and an outer diameter of a rotary blade.

[Explanation of symbols]

 2 ... Outer tub, 5 ... Washing / dehydrating tub, 8 ... Rotor blade.

Front page continuation (72) Inventor Isao Hiyama 1-1-1, Higashi-Taga-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Taga factory (72) Inventor Shun-ichi Ishikawa 1-1-1, Higa-Taga-cho, Hitachi-shi, Ibaraki Stock company Hitachi Co., Ltd. Taga factory (56) Reference JP-A-54-139271 (JP, A) JP-A-49-3476 (JP, A) JP-A-52-116656 (JP, A) Actual development Sho-56 -44674 (JP, U)

Claims (1)

[Claims] 1. A washing tub that also serves as a dehydration tub in an outer tub that is vibration-isolated and supported by an outer frame, a rotary wing that is rotatably disposed on the inner bottom of the washing tub, and drives the washing tub and the rotary wing. And a motor for automatically rotating the rotary blades in the forward and reverse directions by continuously reversing the motors at the time of washing, so that the washing tub and the rotary blades can be rotated in one direction during spin-drying. In the washing machine adapted to be rotated in a vertical direction, the height of the rotary blade is set to about 60 mm, and the ratio of the inner bottom area (projected area) of the washing tub to the upper area (projected area) of the rotary blade is 1 .44 to 3.24, the operating speed of the rotor is set to 100 rpm to 350 rpm, and the operating time (motor ON) at the time of forward rotation and reverse rotation of the rotor is set to be 0. 75 seconds to 3 seconds , and the rotor blade 2. A washing machine characterized in that at least a rest time (motor OFF) required for reversing the motor is provided between the normal rotation and the reverse rotation, and the rest time is provided so as not to exceed the operation time.