JP2002011279A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the washing performance by promoting the dissolution of a detergent and the water absorption by washing. SOLUTION: A circulating pump 16 is operated in the water feed of washing stroke, and the water sucked from the bottom of an outer tub 2 is discharged from a discharge port 19 through a circulating water passage 18. A washing and dehydration tub 5 is also rotated at a low speed integrally with a pulsator 7. According to this, since water is fallen onto substantially the whole surface of the inner bottom surface of the washing and dehydration tub 5, the detergent can be run down into the water level regardless of the detergent input position by a user to promote the dissolution. Since the water is fallen onto the whole washing, the water absorption by the washing can be also promoted. Thus, sufficient washing performance can be exhibited from the point of time when the pulsator 7 is rotated to start the washing operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine, and more particularly to a spiral type fully automatic washing machine.

[0002]

2. Description of the Related Art In a general spiral type fully automatic washing machine, a bottomed cylindrical outer tub is suspended and supported by a hanging rod for absorbing vibration, and inside the outer tub, a bottomed cylindrical shape is also provided. A washing dewatering tub having a large number of dewatering holes is rotatably provided, and a pulsator for stirring is rotatably provided on the inner bottom thereof.

[0003] The normal use procedure of this type of washing machine is as follows. The user first puts the laundry in the laundry dehydration tub, and presses a start button to instruct the start of the laundry. Then, for example, the pulsator is driven to rotate for a short time, and the amount of laundry is detected according to the rotational load at that time. Based on the amount of the laundry detected at this time, the water level and the strength of the water flow at the time of washing and rinsing are determined. The display panel displays the determined water level or an appropriate amount of detergent according to the water level, and the user inputs an appropriate amount of detergent into the washing / dewatering tub with reference to the display. On the other hand, once the water level is determined,
Water supply into the outer tank is started by automatically opening the water supply valve. Then, when the water is supplied to the set water level, the water supply valve is closed, and the pulsator rotates to start substantial washing.

[0004] When a reservation operation is performed, an appropriate amount of detergent is stored in advance in a detergent container provided at a water inlet above the washing and dewatering tub. Then, at the time of supplying water in the washing process, the detergent flows out by the water passing through the detergent container, and is automatically charged into the washing and dewatering tub.

[0005]

Such a conventional washing machine has the following problems. In order to exhibit high washing performance in a washing machine, it is preferable that the detergent is sufficiently dissolved in water at the start of the washing operation, that is, at the time when the pulsator starts to rotate. However, when the user puts the detergent, the detergent is not always dropped to a position where the water poured from the water inlet drops when supplying water. In practice, users often do not pay attention to the position of the detergent. Therefore, at the time of water supply, the laundry floats with the detergent on the laundry that has not yet absorbed water, the pulsator starts to rotate, and the laundry is stirred, and then the detergent falls below the surface of the water. Often it is. In particular, powder detergents and powdered soaps are difficult to dissolve simply by immersion in water, and often remain solid in water until stirred by a pulsator.

[0006] As described above, in the conventional washing machine, it takes time until the detergent is completely dissolved, and therefore, the washing operation time is substantially shortened and sufficient washing performance cannot be exhibited. In order to avoid this, it is conceivable to lengthen the washing operation time in consideration of the time until the detergent is dissolved, but this has a drawback that the time required until the end of washing becomes longer. .

Further, since the water falling from the water inlet only falls on some of the laundry, even when the water supply is completed, some of the laundry hardly absorbs water, and the pulsator rotates. Often, water is absorbed after being stirred. Even if the detergent is dissolved in water, washing is not performed unless the laundry has absorbed water, which is another factor that deteriorates the washing performance.

The present invention has been made to solve such problems, and a main object of the present invention is to improve the washing operation by promoting the dissolution of the detergent at the time of water supply and at the same time promoting the water absorption of the laundry. An object of the present invention is to provide a washing machine capable of obtaining cleaning performance.

[0009]

According to a first aspect of the present invention, there is provided a washing machine in which a washing and dewatering tub is rotatably arranged inside an outer tub. ) A water supply means for externally supplying water into the washing and dewatering tub, and b) a water circulating means for sucking water stored at the bottom of the washing and dewatering tub, pushing up to the top of the washing and dewatering tub and discharging into the tub. C) a tub rotation driving means for rotatingly driving the washing and dewatering tub, d) when water is being supplied by the water supply means, while the washing and dewatering tub is being rotated at a low speed by the tub rotation driving means, Operation control means for discharging water from the upper part of the washing and dewatering tub toward the inside of the tub.

A second washing machine according to the present invention is the washing machine according to the first washing machine, wherein a stirring blade is rotatably disposed on an inner bottom of the washing and dewatering tub, and a blade rotating drive for rotating the stirring blade. Means, the operation control means, the water supply is substantially finished, until the predetermined time has elapsed from the start of the washing operation by rotating the stirring blades by the blade rotation drive means,
The discharge of water by the water circulation means is continued.

A third washing machine according to the present invention is a washing machine in which a washing and dewatering tub is rotatably disposed inside an outer tub, and a stirring blade is rotatably disposed at an inner bottom of the washing and dewatering tub. A) a water supply means for externally supplying water to the washing and dewatering tub; and b) sucking water stored at the bottom of the washing and dewatering tub, pushing it up to the top of the washing and dewatering tub, and discharging it into the washing and dewatering tub. Water circulation means, c) blade rotation driving means for rotationally driving the stirring blades, d) while the water supply is being performed by the water supply means, the water supply is substantially finished, and the stirring blades are rotationally driven by the blade rotation driving means. And an operation control means for discharging water from the upper part of the washing and dewatering tub into the washing dewatering tub by the water circulating means until a predetermined time elapses after the washing operation is started.

In a fourth washing machine according to the present invention, in the second or third washing machine, the operation of the water circulating means is terminated when the detergent is almost completely dissolved or the laundry is almost completely absorbed. It is characterized in that it is determined in advance in consideration of the time required.

The fifth washing machine according to the present invention is characterized in that
4. The washing machine according to any one of 4, further comprising water level detection means for detecting a water level in the washing dehydration tub, wherein the operation control means detects a decrease in water level by the water level detection means in a state where the water circulation means is operated. When the water level is low, the water supply means is controlled to additionally supply water up to a predetermined water level or a predetermined amount of water.

A sixth washing machine according to the present invention is characterized in that
5. In the washing machine according to any one of the items 5,
After the operation of the water circulation means is completed, the water level is detected again by the water level detection means, and the water supply means is controlled to additionally supply water at least to a predetermined water level.

The seventh washing machine according to the present invention is characterized in that
6. In any one of the washing machines of 6, the operation control means includes:
The operation time of the water circulation means is measured after the rotation control of the stirring blade is first started, and the operation of the water circulation means is terminated when the accumulated measurement time reaches a predetermined time. I have.

According to an eighth aspect of the present invention, there is provided the washing machine according to the second aspect.
7. The washing machine according to any one of 7, wherein the operation control means is provided with an operation period and an operation suspension period until the operation of the water circulation unit is completed.

In a ninth washing machine according to the present invention, in the above-mentioned eighth washing machine, during the washing operation, the operation control means includes: a first water flow for rotating only the stirring blades in a predetermined pattern; The second water flow, which is a combination of the rotation of the water tank and the rotation of the stirring blade, is switched and executed, and the water circulation means is operated during the first water flow, and the operation is performed during the second water flow. Is temporarily stopped.

The tenth washing machine according to the present invention is characterized in that
In any one of the washing machines, the operation control means may supply water from the upper part of the washing and dewatering tub into the washing tub by the water circulating means at the time of supplying water in the final rinsing step and / or also at the beginning of the rinsing operation. It is characterized by discharging.

[0019]

According to the first washing machine of the present invention, at the time of supplying water, the water stored at the bottom of the washing and dewatering tub is pushed up to the upper portion of the washing and dewatering tub, and the water enters the washing and dewatering tub. It gets down from the stored laundry. At this time, even though the range in which the water falls does not cover the entire inner bottom surface of the washing and dewatering tub, the washing and dewatering tub is rotated at a low speed. For this reason, while the washing / dewatering tub makes one rotation, the water uniformly falls on the entire laundry.

Therefore, no matter where the detergent is placed in the washing and dewatering tub, the detergent directly flows down under the water surface due to the direct flow of water, and the detergent is dissolved by the stirring action of the falling pressure of the water. Promoted. Further, since the water containing the detergent is also agitated in the process of being sucked and discharged by the water circulating means, the dissolution of the detergent is further promoted. In addition, since the water falls evenly on the laundry stored in the washing and dewatering tub, the water easily permeates the laundry. From this, the washing effect is fully exhibited from the beginning of the washing operation,
High cleaning performance can be obtained.

In addition, when the detergent water is dropped from above the laundry, mechanical pressure is applied to the laundry located particularly near the water surface or the laundry exposed on the water surface, and the detergent water is discharged. The chance of passing through the fiber gap increases. That is, it is possible to obtain the same effect as the circulation hose using the pump action at the time of rotation of the stirring blade provided in the conventional washing machine, without rotating the stirring blade. Furthermore,
By circulating detergent water, foaming is also improved. With these, the cleaning effect can be further enhanced.

If the rotation speed of the washing and dewatering tub is increased, water dropped from above by the water circulating means may hit the laundry and bounce greatly. Since the aquarium is rotated at a low speed, such water splashing can be avoided.

Although the circulation of water as described above is very useful for accelerating the dissolution of the detergent, it is not always completely dissolved at the time when the water supply is substantially completed and the washing operation is started. The same applies to water absorption of laundry. According to the second and third washing machines according to the present invention, even after the washing operation is started by the rotational driving of the stirring blade, the water circulation by the water circulation means is continuously performed for a while. . Therefore, even if the detergent dissolution or the water absorption of the laundry is insufficient at the start of the washing operation, the water continues to fall from above, and the detergent is stirred in the process of circulating the water. Is promoted, and the water absorption of the laundry is also promoted.

In such a washing machine, the detergent water is agitated after the detergent is completely dissolved in the water, so that the amount of foam is increased. Generation of appropriate foam is effective for improving the cleaning performance, and also gives the user a sense of security that washing is being performed reliably. However, excessive foaming causes a problem that the rinsing performance is deteriorated and that the washing and dewatering tub is difficult to rotate due to the foam being restrained during the intermediate dewatering after the washing operation. According to the fourth washing machine of the present invention, the water circulation means operates for a while after the washing operation is started, but when the detergent is almost completely dissolved, or when the laundry has almost completely absorbed water. , Water circulation is stopped. Therefore, since the detergent water is not unnecessarily stirred, it is possible to prevent a state where excessive bubbles are generated at the end of the washing operation.

Further, when the agitating blades rotate and the laundry is agitated thereby, the laundry may absorb more water and the water level may decrease. That is, even if water is once absorbed to a predetermined water level, the water level may subsequently drop. According to the fifth washing machine of the present invention, even when the water absorption is advanced due to the stirring action and the water circulation action and the water level is lowered, the reduced water is additionally supplied, so that the washing performance is deteriorated. Nothing. In addition, since the water circulating means operates even during such additional water supply, dissolution of the detergent is promoted.

However, when the water level is detected in the fifth washing machine, since the water circulation means is operating, the water surface is relatively wavy, and the detection accuracy of the water level is not very high. Therefore, even if the water level does not decrease due to the water absorption of the laundry after the additional water supply ends, the water level may be lower than the actual set water level. According to the sixth washing machine of the present invention, after the elapse of the predetermined time from the start of the washing operation and the end of the operation of the water circulating means, the decrease in the water level is detected again, and the necessary level is determined in accordance with the result. If so, additional water supply is performed. Therefore, the washing operation can be performed at an appropriate water level, and high washing performance can be obtained.

Further, according to the seventh washing machine of the present invention, for example, even if the operation is suspended during the washing operation and the washing operation is repeated from the beginning by the user's operation, Since the operation of the water circulation means is managed by the accumulated operation time, the water circulation means does not operate for an undesirably long time. Therefore, it is possible to prevent an abnormally large amount of bubbles from being generated by the water circulation operation.

Further, according to the eighth washing machine of the present invention, water is not circulated during the operation suspension period, and the generation of bubbles is suppressed. Therefore, generation of an abnormally large amount of bubbles can be prevented. Note that the operation suspension period may be provided at least once, but the operation period and the operation suspension period may be repeatedly provided to perform so-called intermittent operation.

According to the ninth washing machine of the present invention, in the second water flow period, the water flow generated in one direction due to the rotation of the washing and dewatering tub and the rotation of the stirring blades are caused. As a result, the water flow generated in the opposite direction collides with the water flow, and a large vertical water flow is generated, whereby the effect that the laundry is switched in the vertical direction can be obtained. On the other hand, since a mass of laundry often rises greatly above the water surface, when water is discharged from above, there is a high possibility that large splashes of water will occur on the laundry. Therefore, if the operation of the water circulating means is stopped during this period, it is possible to prevent the occurrence of a large splash of water and to achieve the effect of preventing the excessive generation of bubbles as described above.

Although the above description has been made in connection with the washing process, a soft finish may be added during the final rinsing process in order to give a soft feel to the laundry or to obtain an antistatic effect. According to the tenth washing machine according to the present invention, since the water circulation means is operated even during the final rinsing process,
The introduced soft finish is quickly dissolved in water, and the desired effect can be sufficiently exhibited. In addition, it is possible to prevent the rich soft finish from remaining in the laundry.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the washing machine according to the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view showing the structure of the washing machine of the present embodiment. Inside the housing 1 of the washing machine, a bottomed cylindrical outer tub 2 is provided with a front hanging rod 3 and a rear hanging rod 4 (each 1
(Each book is visible, but there are actually two each.) It is suspended so as to be inclined forward. Corresponding to the projection of the outer tub 2 forward and forward, the upper part of the front surface of the housing 1 also projects. Inside the outer tub 2, a washing and dewatering tub 5 having a large number of dehydration holes in a peripheral wall is rotatably supported about a main shaft 6. A pulsator 7 for stirring the laundry is arranged at the bottom of the washing and dewatering tub 5. A motor 8 for direct drive and a clutch 9 for switching power are provided above the extension of the main shaft 6. Have been.
The clutch 9 mainly rotates only the pulsator 7 in one direction or both directions during the washing operation or the rinsing operation, and rotates the washing / dewatering tub 5 and the pulsator 7 integrally in one direction (this is the normal rotation direction) during the spin-drying operation. The switching is performed to make it possible.

A water inlet 10 provided with a detergent container and a soft finish agent container for charging a detergent and the like housed therein is provided at the upper rear of the outer tub 2. A water supply pipe 11 provided with a water supply valve 12 and a finishing agent valve 13 on the way is connected to the water supply port 10. When the water supply valve 12 is opened, the water supply port 11 is supplied through an external water tap or the like through the water supply pipe 11. Water flows into the detergent container 10 while the finish agent valve 1
When 3 is opened, water flows into the finishing agent container of the water inlet 10 through the water supply pipe 11, and in any case, the water is discharged from the water inlet 10 toward the lower outer tub 2. Outer tub 2
One end of a drain pipe 14 is connected to the front end of the bottom of the, ie, the lowest part, and the drain pipe 14 is opened and closed by a drain valve 15. The other end of the drain pipe 14
Although not shown, it is connected to an external drainage ditch via an upright drainage hose.

A circulation pump 16 is attached to the lower side of the bottom of the outer tank 2. A suction hose 17 connected to the suction port side of the circulation pump 16
And the drain valve 15. On the other hand, a circulating water channel 18 erected outside the outer tub 2 is connected to the discharge port side of the circulating pump 16, and the upper end thereof extends to the upper portion of the outer tub 2 and is directed toward the inside of the washing and dewatering tub 5. The outlet 19 is formed. That is, when the circulation pump 16 is driven in a state where water is stored at the bottom of the outer tank 2, the water sucked from the outer tank 2 via the suction hose 17 is pumped to the circulation water passage 18, and the inside of the circulation water passage 18 is supplied. The raised water is discharged from the discharge port 19 into the washing / dewatering tub 5.

As described above, in the washing machine of this embodiment, the outer tub 2 and the washing and dewatering tub 5 are inclined forward to
The upper surface opening faces forward rather than vertically upward. That is, the center axis CL of the outer tub 2 is disposed so as to be inclined by a predetermined inclination angle α with respect to the vertical line VL. Therefore, a user standing in front of the washing machine can
It is easy to visually recognize the bottom of the garment and to take out the laundry easily. Here, when the inclination angle α is in the range of about 5 to 20 °, the laundry can be easily taken out sufficiently, and the protrusion of the housing 1 does not need to be too large. In this embodiment, the inclination angle α is set to about 10 °.

FIG. 2 is a diagram showing the reach of water discharged from the discharge port 19 to the inner bottom surface of the washing / dewatering tub 5. The center of the water reaching area 20 substantially covers the center of the pulsator 7, and both ends of the reaching area 20 reach near the inside of the side wall of the washing and dewatering tub 5. Therefore, if the washing and dewatering tub 5 is rotated while discharging water from the discharge port 19 as described later, water will fall on substantially the entire inner bottom surface of the washing and dewatering tub 5. In addition, the reaching range 21 of the water discharged from the water inlet 10 is set at a position closer to the side wall of the washing and dewatering tub 5 than the reaching range 20.

FIG. 3 is an electric system configuration diagram of a main part of the washing machine of the present embodiment. CPU, RAM, RO at the center of control
A control unit 30 including M, a timer, and the like is provided. The control unit 30 receives an operation signal from a key input unit 31 having a plurality of buttons, a lid opening / closing signal interlocking with the opening / closing of the upper lid from a lid switch 32, and a water level sensor 33 from the water level sensor 33. A water level detection signal according to the water level is input. The control unit 30 controls the rotation of the motor 8 via the inverter driving unit 34, and controls the load driving unit 3
Via 5, the opening / closing operation of the water supply valve 12, the finishing agent valve 13 and the drainage valve 15, the connection / disconnection operation of the clutch 9, and the operation / stop of the circulation pump 16 are controlled. Further, the control unit 30 displays the reception state of the key input, the progress of the washing, and the like on the display unit 36, and sounds the buzzer 37 as necessary.

FIG. 4 is a flowchart showing a flow of a standard washing process in the washing machine of the present embodiment. The operation of the washing machine will be schematically described with reference to FIG. When the user stores the laundry in the laundry dehydration tub 5 and presses the start button by the key input unit 31, the amount of the laundry put into the laundry dehydration tub 5, that is, the load amount is detected before water is supplied. (Step S1). Specifically, the pulsator 7 is rotated for a short time, and the load amount is determined according to the time during which the inertial rotation continues. Of course, the load amount detection is not limited to this method, and any method may be used. The water level (hereinafter, referred to as “set water level”) at the time of washing or pool rinsing described below is determined according to the load amount thus detected. The display 36 displays an instruction for the amount of detergent to be supplied according to the water level determined here, and the user inputs an appropriate amount of detergent into the washing / dewatering tub 5 according to the display.

When the actual washing is started, water is supplied to the set water level determined as described above in the washing and dewatering tub 5, and the washing is executed by rotating the pulsator 7 at a predetermined speed and reversely. Is performed (step S2). When the washing is completed, the water in the washing and dewatering tub 5 is drained, and the washing and dewatering tub 5 and the pulsator 7 are rotated at a high speed to perform intermediate dehydration (step S3). By this intermediate dewatering, detergent water soaked into the laundry is scattered and removed.

Next, dehydration rinsing is performed as the first rinsing (step S4). In the dehydration rinsing, the washing and dewatering tub 5 is rotated, and water is poured onto the laundry from the water inlet 10 in a shower-like manner, so that the laundry absorbs clean water,
Instead, they try to push out detergent water that has soaked into the laundry. Then, after sufficient water is contained in the laundry, the intermediate dehydration is performed by the process of step S5 similar to step S3, and the water permeating the laundry is scattered. Next, the pool rinsing is executed for the second time, that is, the final rinsing (step S6). That is, water is supplied into the washing / dewatering tub 5 to the set water level, and the pulsator 7 is rotationally driven as in step S2. At the time of supplying water for the final rinsing, the soft finish contained in the finish agent container is put into the washing / dewatering tub 5. When the pool rinsing is completed, the water in the washing and dewatering tub 5 is drained, and the final dehydration is executed by rotating the washing and dewatering tub 5 and the pulsator 7 together at a high speed as in the case of intermediate dehydration (step S7). .

The above procedure is a standard procedure,
Depending on the type of the laundry, the procedure may be changed as appropriate, for example, performing a pool rinsing or a water rinsing instead of the dehydration rinsing, or increasing the number of times of the dehydration rinsing or the pool rinsing.

The features of the washing machine according to the present embodiment are that the control is executed during the period from the water supply at the beginning of the washing operation in step S2 to the beginning of the washing operation, and the initial operation of the rinsing operation in the final rinsing operation in step S6. The control is related to the driving of the circulation pump 16.

First, the control related to the drive of the circulation pump 16 executed during the period from the water supply at the beginning of the washing process to the initial stage of the washing operation will be described with reference to the flowcharts of FIGS. FIG. 12 is a timing chart showing an example of the processing operation executed during this period. This period can be divided into a water supply period from the start of water supply until the water level in the washing and dewatering tub 5 reaches a predetermined water level, and a washing operation period after the pulsator 7 starts rotating after reaching the predetermined water level. (See FIG. 12 (f)).

FIGS. 5 and 6 are control flowcharts during the water supply period. Among these, the flowchart shown in FIG. 6 is a processing procedure for determining the operation start timing of the circulation pump 16 during the supply of water. In the following description, flags F1 to F6 and timers T1 to T
6. A counter for counting the number of operations P appears, and it is assumed that these are all set to 0 by initial setting.

When the water supply process is started, first, it is determined whether or not the water level in the washing and dewatering tub 5 has reached a predetermined water level based on the water level detection signal from the water level sensor 33 (step S10). This predetermined water level is a water level that is set slightly lower than the set water level. In the case of the washing machine of the present embodiment, the water level set in the washing and dewatering tub 5 in the multistage is two times lower than the set water level. The water level is set at a lower level.

Normally (that is, the outer tub 2
Since the water level is almost zero at the beginning of the water supply, it is determined that the water level has not reached the predetermined water level, and the water supply valve control flag F0 is set to 1 (step 1). S11). Next, it is determined whether or not the water level is equal to or higher than the reset water level (step S12).
The reset water level is the lowest water level among the set water levels provided in a plurality of stages.
3 is the lowest water level that can be detected. Since the water level has not reached the reset water level at the beginning of the water supply, the process proceeds from step S12 to S14, and the pump intermittent time timer T1
Count up. This intermittent pump timer T1
Before driving the circulation pump 16 continuously,
This is for measuring the operation time and the operation stop time when the circulation pump 16 is operated intermittently for a short time (about 2 seconds).

Next, it is determined whether or not the pump continuous operation flag F1 is 1 (step S15). Initially, since the pump continuous operation flag F1 is 0, it is determined whether or not the number of times P of pump operation is 5 or more (step S1).
6). The pump operation number P is the number of executions of the operation when the circulation pump 16 is intermittently operated as described above. Initially, the pump operation count P is also 0, so it is next determined whether or not the circulation pump 16 is on (step S18). Since the circulation pump 16 is not on,
Next, it is determined whether or not the number of pump operations P = 0 (step S22). Since P = 0, T is set to 60 seconds (step S24). Then, whether the time of the pump intermittent time timer T1 is equal to or greater than T, that is,
It is determined whether or not 0 seconds or more (step S25).
If it is less, the process proceeds to step S31.

In step S31, it is determined whether or not the water supply valve control flag F0 is 1. Since the water supply valve control flag F0 is set to 1 first (in the above step S11), the water supply valve 12 is opened (step S32). As a result, water flows from the water supply pipe 11 into the water inlet 10 and further flows down into the washing and dewatering tub 5 below.
When the detergent is stored in the detergent container for reserved washing or the like, the detergent is pushed out by this water supply and put into the washing / dewatering tub 5.

After the water supply is started, the process returns to step S10. Therefore, the above processing is repeated until the water level reaches the reset water level or until the time of the pump intermittent time timer T1 reaches 60 seconds. Here, as an example, the description will be continued on the assumption that the time measured by the pump intermittent timer T1 exceeds 60 seconds before the water level reaches the reset water level. If the time of the pump intermittent time timer T1 exceeds 60 seconds, the process proceeds from step S25 to S26, where the pump intermittent time timer T1 is cleared. Then, it is determined whether or not the circulation pump 16 is in the ON state (Step S)
27) If it is off, the circulating pump 16 is operated (step S28).

In this state, steps S31 → S32 → S
10 → S11 → S12 → S14 → S15 → S16 → S1
The process proceeds to step 8. At this time, since the circulation pump 16 is in the ON state, the process proceeds from step S18 to S19, and it is determined whether or not the water level has reached the reset water level. Here, if the water level has not reached the reset water level, T is set to 2 seconds (step S21), and thereafter, whether or not the time measured by the pump intermittent time timer T1 is T or more, that is, 2 seconds or more Is determined (step S25), and T
If less, the process returns to step S31. Therefore, after this, steps S10 → S11 → S12 → S14 →
The process proceeds in the order of S15 → S16 → S18 → S19, and it is repeatedly determined whether or not the water level has reached the reset water level. If the time of the pump intermittent time timer T1 has elapsed 2 seconds before the water level reaches the reset water level, the process proceeds from step S25 to S26. At this time, since the circulation pump 16 is in the ON state, step S
The process proceeds from S27 to S29, in which the circulation pump 16 is stopped, and thereafter the number of pump operations P is incremented (step S30).

When returning to step S31 in this state, steps S10 → S11 → S12 → S14 → S15 → S16
The process proceeds from S18 to S19. First, the number of pump operations P
Is incremented and not 0, so T is 30
Seconds are set (step S23). That is, only for the first time from the start of water supply, a 60-second operation stop period is provided, and after that, the circulation pump 16 is operated for only 2 seconds, and it is determined whether the water level has reached the reset water level during the operation. Checked. If the reset water level has not been reached, an operation stop period of 30 seconds is provided next, after which the circulation pump 16 is operated again for only 2 seconds, and whether the water level has reached the reset water level during the operation. It is checked whether or not. Thus, the circulation pump 16
Is operated and its operation is stopped, the pump operation number P is sequentially incremented in step S30 as described above.

FIG. 13 shows a circulating pump 16 as described above.
FIG. 5 is a timing chart showing an intermittent driving operation of FIG. After the start of water supply, the circulation pump 16 is repeatedly operated for about 2 seconds as shown in FIG. Of course, as will be described later, if the reset water level is reached during that time, the intermittent driving is not performed at that time.

Generally, unless the water supply capacity is extremely low, the water level should reach the reset water level in about 1 to 2 minutes. However, in some cases, it may take considerable time to reach the reset level. In the washing machine of this embodiment, the number of times the circulation pump 16 is intermittently driven for a short time is limited. That is, as described above, the number of pump operations P is incremented each time the driving of the circulation pump 16 is stopped (see FIG. 13D). The process returns from S16 to S31, and step S31 is performed.
The intermittent drive of the circulation pump 16 by the processing of 18 to S30 is not executed.

Normally, when the water supply is performed normally, the water level exceeds the reset water level in about 1 to 2 minutes from the start of water supply. In this case, if it is determined in step S12 that the water level is equal to or higher than the reset water level, the clutch 9 is operated via the load driving unit 35 to connect the washing / dewatering tub 5 and the pulsator 7, and further the inverter driving unit 34 is operated. The motor 8 is driven via the motor.
At this time, control is performed so that the washing / dewatering tub 5 and the pulsator 7 are integrally rotated at a rotation speed of about 20 rpm in one direction (step S13).

If the water level is equal to or higher than the reset water level when the circulation pump 16 is on as described above, the process proceeds from step S19 to S20, and the pump continuous operation flag F
1 is set to 1 (step S20). Once the pump continuous operation flag F1 is set to 1 as described above, the next time the above-described flow is executed, steps S15 to S15 are executed.
Then the program goes to 17. Therefore, thereafter, the intermittent drive of the circulation pump 16 by the processing of steps S16 to S30 is not performed, and the circulation pump 16 is continuously operated. With the above control, when the water level exceeds the reset water level, the washing and dewatering tub 5 is driven almost without delay from the time when the water level reaches the reset water level, but the circulating pump 16 shifts from intermittent driving to continuous operation. This can be delayed by up to 30 seconds.

When the circulation pump 16 is driven continuously,
As described above, the water stored in the outer tub 2 is sucked through the suction hose 17, pushed up into the circulating water channel 18, and discharged from the outlet 19 into the washing and dewatering tub 5. Further, at this time, since the washing and dewatering tub 5 is slowly rotating, water falls on any part of the washing and dewatering tub 5. Therefore, water falls on the detergent regardless of the position of the detergent,
Rinse detergent under water. Further, the detergent itself is sucked together with the water, and is discharged from the discharge port 19. Therefore, the detergent is sufficiently stirred in the water, so that the dissolution is promoted. Furthermore, since water falls on the whole laundry, water absorption of the laundry is promoted.

In this way, the water supply is continued while the circulation pump 16 is continuously driven and the washing and dewatering tub 5 is rotating at a low speed, and when the water level reaches the predetermined water level, the water level is increased to the predetermined water level in step S10. Is reached, and the water supply period ends.

At the same time as the end of the water supply period, the washing operation period starts. 7 to 11 are control flowcharts during such a washing operation period. When the washing operation is started, first, the washing time timer T2 is counted up (step S40), and it is determined whether or not the time measured by the timer has exceeded the washing set time (step S41).
If the set washing time has not been reached, a pump control process is executed during the washing period (step S42).

FIG. 9 is a flowchart of the pump control during the washing period. In the pump control process during the washing period, first, A
It is determined whether or not the water flow in progress flag F4 is 1 (step S80). As will be described in detail later, this washing machine performs motor control so as to generate two different types of water flows, that is, an A water flow and a B water flow. 0. Therefore, it is next determined whether or not the flushing pump end flag F2 is 1 (step S81). Immediately after the start of the washing operation, since the flushing pump end flag F2 is also 0, it is determined whether or not the set water level has been reached (step S).
82).

If the set water level has not yet been reached, it is determined whether or not the pump continuous operation flag F1 is 1 (step S83). If the water level is equal to or higher than the reset water level in the previous step S19, the flag F1 should have been set to 1 in step S20. However, if the water level does not reach the reset water level within a predetermined time as described above, the flag F1 is reset. It remains at 0. In this case, the circulation pump 16 should not be operating since the flow does not go through step S17. However, if the flag F1 is 0 in step S83, the circulation pump 16 is not operated.
And returns to the original routine. Further, even if the water level does not reach the reset water level within the predetermined time and the flag F1 remains 0, the water level reaches the set water level in step S82 due to, for example, an increase in water supply capacity during water supply. May be determined. In that case, the pump continuous operation flag F1 is set to 1 in step S84.
Set to.

In any case, the pump continuous operation flag F
When 1 is 1, the circulating pump 16 is operated (step S86). Of course, steps S82 → S83 →
When the process proceeds to S86, the circulation pump 16 is already operating, so that the operation is only continued. When the process proceeds to steps S82 → S84 → S86, the circulation is started only at this time. Pump 16 operates. Thereafter, the washing pump operation time timer T3 is counted up (step S87), and it is determined whether or not the time counted by the timer is 160 seconds or more (step S88). Immediately after the start of the washing operation, the time of the timer is naturally less than 160 seconds, so that the process returns to the original routine.

Returning to FIG. 7, after the pump control process is performed during the washing period, the water supply valve control flag F0 is set to 1 (step S43). Then, it is determined whether or not the water level has reached the set water level (step S4).
4) If the set water level has been reached, the water supply valve control flag F0 is set to 0 (step S45). Conversely, if the set water level has not yet been reached, the water supply valve control flag F0 remains at 1. Next, it is determined whether or not the flushing pump end flag F2 is 1 (step S4).
3). Immediately after the start of the washing operation, the washing pump end flag F
Since 2 is 0, the process proceeds to the washing 40 seconds process (see FIG. 10) after step S60.

In this washing 40 seconds process, first, washing 40
It is determined whether or not the second execution flag F5 is 1 (step S60). Immediately after the start of the washing operation, since the washing 40-second execution flag F5 is also 0, it is next determined whether or not the time measured by the washing time timer T2 is 40 seconds or more (step S).
62). Until the time of the washing time timer T2 reaches 40 seconds, the water flow control process from step S70 (see FIG. 11).
Proceed to.

In the water flow control processing, first, it is determined whether or not the A water flow in progress flag F4 is 1 (step S7).
0). As described above, initially, the A water flow in-operation flag F4
Is 0, it is determined whether or not the time measured by the washing time timer T2 has reached a predetermined A water flow execution time (step S71). The first A water flow execution time is determined, for example, 100 seconds after the start of the washing operation. Therefore, immediately after the start of the washing operation, the time of the washing time timer T2 has not reached the A water flow execution time, and the motor control based on the B water flow pattern is executed (step S73).

In the B water flow pattern, the pulsator 7 is rotated left and right in reverse. Since the washing and dewatering tub 5 is rotating at a low speed at the time of supplying water as described above, first, the connection between the pulsator 7 and the washing and dewatering tub 5 is released by the clutch 9, and then only the pulsator 7 is rotated in a predetermined pattern. To control the motor 8. Then, the process proceeds to step S55, and it is determined whether or not the water supply valve control flag F0 is 1. If the water level has reached the set water level after the start of the washing operation, the water supply valve control flag F0 should have been reset to 0 in step S45 described above. In that case, the process proceeds from step S55 to S57, in which the water supply valve 12 is closed and the water supply is temporarily stopped. If the set water level has not yet been reached, the process proceeds from step S55 to S56, and water supply is continued.

Normally, immediately after shifting from the water supply period to the washing operation period, the water supply is continued and the pulsator 7 starts operating with the circulation pump 16 operating. As a result, the laundry in the washing / dewatering tub 5 is agitated and washing is started. However, since water is continuously discharged from the discharge port 19, even if the detergent is not sufficiently dissolved, the detergent is not removed. Is promoted. In addition, when the water supply is performed normally, the water level reaches the set water level for a while after the washing operation is started. Therefore, the water supply valve 12 is closed as described above, the water supply is stopped, and the circulation pump 16 is turned off. Washing by reversing the pulsator 7 is performed in the operating state.

When 40 seconds have elapsed from the start of the washing operation period, it is determined in step S62 that the washing time timer T2 has reached 40 seconds in the above-described processing flow, and whether or not the set water level has been reached is determined. Judgment (Step S6
3). When the water supply is stopped first, the water level should be the set water level, but if the laundry has not completely absorbed the water at that time, the water level may drop as washing proceeds. Often there. Therefore, if the set water level has not been reached, the water supply valve control flag F0 is set to 1 (step S64). On the other hand, if the water level is equal to or higher than the set water level at this time, the water supply valve control flag F0 is set to 0 (step S65), and the washing 40-second execution flag F5 is set to 1 (step S66). Thereafter, it is determined whether or not the water supply valve control flag F0 is 1, and if F0 is 1, the water supply valve 12 is opened (steps S55 and S56).
Therefore, if the water level is lower than the set water level in step S63, the water supply valve 12 is opened to start water supply (supplementary water).

In the washing 40-second process after the start of the makeup water until the water level reaches the set water level, S60
Processing proceeds in the order of → S62 → S63 → S64. That is, the process is repeated without executing the water flow control process.
Therefore, during this time, the motor control is not performed and the rotation of the pulsator 7 stops. Then, when the water level reaches the set water level, steps S64 → S65 → S66 → S55 → S5
Since the process proceeds to step 7, the water supply valve 12 is closed and the water supply is stopped. After the makeup water is stopped in this way, and
If the replenishing water has not been started, the washing 40-second execution flag F5 is 1, so in the subsequent washing 40-second processing, the processing proceeds from S60 to S61, and the water supply valve control flag F0 is set to 0. The water flow control process is executed while maintaining the same.

The washing operation further proceeds, and the washing time timer T
When the timing of 2 advances and reaches 100 seconds which is the A water flow execution time, in the water flow control processing, steps S70 → S71 → S
The process proceeds from 72 to S73, sets the A-water flow execution flag F4 to 1, and returns to step S55. Then, in the pump control process during the washing period immediately after that, step S80
It is determined that the A water flow in progress flag F4 is 1, and the circulation pump 16 is stopped (step S85), and the process returns to the original routine. At this time, since step S87 does not pass, the count-up of the washing-time pump operating time timer T3 is temporarily stopped.

Thereafter, in step S70 of the water flow control process, since the A water flow in-operation flag F4 is determined to be 1, the A water flow time timer T4 is counted up (step S74), and the timer T4 counts 30. It is determined whether the time is equal to or longer than seconds (step S75). Until the time reaches 30 seconds, the motor control based on the A water flow pattern is executed (step S78). Therefore, at this point, the flow shifts from the water stream B to the water stream A. A water flow pattern is
This is for promoting the exchange of the laundry in the vertical direction. First, the clutch 9 connects the washing and dewatering tub 5 to the pulsator, and the washing and dewatering tub 5 is rotated in a predetermined direction.
Thereafter, the connection between the washing and dewatering tub 5 and the pulsator is released, and the pulsator 7 is rotated in the opposite direction. As a result, the water flows traveling in opposite directions collide with each other to generate a strong water flow in the vertical direction, and the laundry is switched so that the laundry is turned upside down. During such an operation, the laundry greatly rises above the water surface. Therefore, when the water is discharged from the discharge port 19, there is a high possibility that the water hits the laundry greatly and jumps and scatters out of the tub. Therefore, as described above, the operation of the circulation pump 16 is stopped at the time of transition to the A water flow pattern, and the discharge of water from the discharge port 19 is stopped. Thereby, a large splash of water can be avoided.

When the washing operation according to the water flow pattern continues for 30 seconds, the water flow control process proceeds from step S70 to step S70.
74 → S75 → S76, and the A-water flow execution flag F4
Is reset to 0, and the A water flow time timer T4 is further cleared (step S77). Therefore, in the pump control process during the washing period immediately after that, in steps S80 → S81 →
The process proceeds from S82 to S84 (or S83) to S86, the circulation pump 16 is driven again, and the count-up of the washing-time pump operation time timer T3 is restarted (step S87).
Further, by the water flow control process immediately after that, the flow shifts from the A water flow to the B water flow.

When the washing operation proceeds and the operating time of the circulation pump 16 after the start of the washing operation reaches 160 seconds (the elapsed time from the start of the washing operation is about 190 seconds), in the pump control process during the washing period, step S88. Then, the process proceeds to S89, in which the flushing pump end flag F2 is set to 1. Then, in step S46, the flushing pump end flag F2
Is determined to be 1, then it is determined whether or not the post-circulation make-up water end flag F3 is 1 (step S47). Since the post-circulation make-up water end flag F3 is 0, the post-circulation end make-up water processing consisting of steps S50 to S54 is executed.

In the post-circulation make-up water processing, first, the post-circulation end make-up water time timer T5 is counted up (step S50), and it is determined whether or not the timer T5 measures 10 seconds or more (step S51). . If the time has not reached 10 seconds, the water supply valve control flag F0 is set to 1 (step S55), and then the process returns to step S55. Therefore, the process proceeds from step S55 to S56, the water supply valve 12 is opened, and the second supply water is started. However, since it is not checked whether or not the water level at that time is higher than the set water level, the water supply is started even if the water level does not decrease.

In the pump control process during the washing period immediately after that, the pump end flag F2 at the time of washing is determined to be 1 (“Y” in step S81), and the circulation pump 16 is stopped (step S85). In addition, since the washing 40-second process and the water flow control process are not performed until the make-up water time timer T5 reaches 10 seconds after the end of the circulation, the pulsator 7 is not driven during this time. That is, when the driving of the circulation pump 16 is stopped, the second replenishment water is started almost simultaneously, and this replenishment water continues for at least 10 seconds.
In addition, the driving of the pulsator 7 is stopped during the period of the makeup water.

When 10 seconds have elapsed since the start of the second make-up water, in the make-up water processing after the end of circulation, step S5
The process proceeds from 1 to S52, and it is determined whether or not the water level has reached the set water level. At this time, the pulsator 7 and the circulation pump 1
6 are stopped, and there is almost no undulation of water in the washing and dewatering tub 5, so that the water level can be detected very accurately. If the set water level has not been reached, make-up water is continued. If the set water level has been reached, the replenishment water end flag F3 is set to 1 after the circulation ends (step S5).
3) The water supply valve control flag F0 is reset to 0 (step S54). Therefore, after that, step S
Proceeding from S55 to S57, the water supply valve 12 is closed and the second make-up water stops.

When the second replenishing water stops in this way, thereafter, in step S47, it is determined that the post-circulation replenishing water replenishing water end flag F3 is 1, so that the washing is performed again for 40 seconds as described above. And the water flow control process is executed, and the pulsator 7 starts to be driven to rotate. After that, the circulation pump 16 is not driven again during the washing operation period, and in the water flow control process, every time a predetermined washing time elapses, a transition from the B water flow to the A water flow is performed, and the A water flow becomes 30 A. The water flow changes such that the water flow changes to the B water flow after continuing for a second.

By the series of processes described above, the operation of the circulation pump 16 is started at a point in time after the start of water supply, and the washing / dewatering tub 5 is rotated slowly. Further, the operation of the circulation pump 16 is continued for a while after the washing operation by the rotation drive of the pulsator 7 is started. That is, the circulation pump 16 from the start of the washing operation
The operation time is limited to a predetermined time (160 seconds in this example), but it should be noted here that the predetermined time is not affected by, for example, an extension of the washing operation time by a user operation. That is. That is, in this washing machine, if an appropriate operation is performed by the key input unit 31 during execution of the washing operation, the washing operation can be restarted from the beginning. However, even in that case, the above-described pump operation time timer T3 during washing is not cleared,
The operation time from the start of the first washing operation is counted. Thus, the circulation pump 16 does not operate for a long time after the detergent is sufficiently dissolved, and it is possible to prevent an abnormally large amount of bubbles from being generated.

The reason why the operation of the circulating pump 16 is stopped during the execution of the A water flow is, as described above, in addition to the purpose of preventing large water splashes, in addition to temporarily stopping the circulating pump 1 during the operation.
Stopping the operation of Step 6 is also effective in preventing abnormal bubbles from being generated. Therefore, for such a purpose, the operation of the circulation pump 16 is not stopped only during the execution of the A water flow as in the above-described embodiment, but is performed at appropriate time intervals during the execution of the B water flow. The operation may be temporarily stopped.

Next, control of the circulation pump 16 performed during the final rinsing step will be described with reference to the flowchart of FIG. In the final rinsing process, after the water supply ends and the pulsator 7 starts to be driven to rotate, FIG.
Is repeatedly executed during the final rinsing process. First, it is determined whether or not the rinsing-time pump end flag F6 is 1 (step S90). At the beginning of the rinsing operation,
Since the rinsing-time pump end flag F6 is 0, the circulating pump 16 is driven (step S91). As a result, water starts to be discharged from the discharge port 19, and dissolution of the finishing agent put into the washing and dewatering tub 5 is promoted. Then, the rinsing-time pump operation time timer T6 is counted up (step S9).
2) It is determined whether or not the timer T6 measures 20 seconds or more (step S93).

Until the timer T6 reaches 20 seconds, the process is terminated. When the time of the timer T6 advances and 20 seconds have elapsed, the process proceeds from step S93 to S94, and the rinsing-time pump end flag F6 is set to 1. Therefore, the next time this flow is executed, the rinsing pump end flag F6 is determined to be 1 in step S90, and the circulation pump 16 is stopped. Therefore, according to this processing, the circulation pump 16 is operated only for 20 seconds from the start of the rinsing operation, and thereafter stopped. In addition, instead of operating the circulation pump 16 during the rinsing operation, the circulation pump 16 may be operated when supplying water for rinsing.

Usually, since the finishing agent is a liquid, it is easier to dissolve in water than a powder detergent, and a sufficient dissolution accelerating effect can be obtained even if the circulation pump 16 is operated for a short time. Conversely, if the circulation pump 16 is operated for a long time, the finishing agent may be excessively agitated and foaming may occur, and thus is not suitable for final rinsing. Therefore, it is appropriate to operate the circulation pump 16 for a relatively short time as in the above embodiment. In this embodiment, the finish agent valve 13 is opened at the time of water supply in the final rinsing step in order to automatically supply the finish agent.
Instead of providing the same, a similar effect can be obtained by providing a finishing agent dispenser for automatically dispensing a finishing agent using centrifugal force during dehydration in a part of the balance ring at the upper end of the washing and dewatering tub 5.

By the way, in the washing machine of this embodiment, when water is discharged from the discharge port 19, not only the dissolution of the detergent and the absorption of the laundry can be promoted, but also the washing performance can be improved more directly. . That is, since the detergent water hits the laundry from above, the mechanical pressure is applied, and the detergent water easily passes through the laundry. In particular, it is very effective for laundry located near the water surface in the washing / dewatering tub 5.

Therefore, during the washing operation, the water level may be lower than the water level at the time of pool rinsing. In the above embodiment,
After the set water level is determined based on the load amount detection result, the water level for washing is determined within a range of about 50 to 90% of the set water level. Then, the user is prompted to input an amount of detergent corresponding to the washing water level. The set water level at the time of the washing process is set as this washing water level, and the above-described processing is performed. In this case, it is preferable to increase the operation time of the circulation pump 16. On the other hand, at the time of the final rinsing process (or at the time of other reservoir rinsing), the water level is set to the set water level to prevent the detergent water from remaining. According to such a configuration, water can be saved and the amount of detergent used can be reduced.

The above embodiment is merely an example, and it is apparent that changes and modifications can be made within the spirit of the present invention.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a schematic configuration of a washing machine according to one embodiment of the present invention.

FIG. 2 is a view showing a reaching range of water spouted from a discharge port on a bottom surface in a washing and dewatering tub in the washing machine of the embodiment.

FIG. 3 is an electrical configuration diagram of a main part of the washing machine of the embodiment.

FIG. 4 is a flowchart showing a flow of a standard washing process in the washing machine of the embodiment.

FIG. 5 is a flowchart relating to operation control of a circulation pump in the washing machine of the present embodiment.

FIG. 6 is a flowchart relating to operation control of a circulation pump in the washing machine of the present embodiment.

FIG. 7 is a flowchart relating to operation control of a circulation pump in the washing machine of the present embodiment.

FIG. 8 is a flowchart related to the operation control of the circulation pump (replenishment water processing after completion of circulation) in the washing machine of the present embodiment.

FIG. 9 is a flowchart relating to operation control of a circulation pump (a pump control process during a washing period) in the washing machine of the present embodiment.

FIG. 10 is a flowchart relating to the operation control (40-second washing process) of the circulation pump in the washing machine of the present embodiment.

FIG. 11 is a flowchart relating to operation control (water flow control processing) of a circulation pump in the washing machine of the present embodiment.

FIG. 12 is a timing chart mainly showing the operation of the circulation pump in the washing machine of the embodiment.

FIG. 13 is a timing chart mainly showing the operation of the circulation pump in the washing machine of the embodiment.

FIG. 14 is a flowchart relating to the operation control of the circulation pump during the final rinsing step in the washing machine of the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Housing | casing 2 ... Outer tub 3, 4 ... Hanging bar 5 ... Washing dehydration tub 6 ... Main shaft 7 ... Pulsator (stirring blade) 8 ... Motor 9 ... Clutch 10 ... Water inlet 11 ... Water supply pipe 12 ... Water supply valve 13 ... Finish Agent valve 14 ... Drain pipe 15 ... Drain valve 16 ... Circulation pump 17 ... Suction hose 18 ... Circulation water channel 19 ... Discharge port 30 ... Control unit 31 ... Key input unit 32 ... Lid switch 33 ... Water level sensor 34 ... Inverter drive unit 35 ... Load drive unit 36 ... Display unit 37 ... Buzzer

 ──────────────────────────────────────────────────の Continuing on the front page (72) Katsumi Oe 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Shinji Mae 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Inventor Yasuyuki Uno 2-chome 5-5 Keihanhondori, Moriguchi-shi, Osaka Prefecture (72) Inventor Yasuyuki Horibe 2 Keihanhondori, Moriguchi-shi, Osaka 5-5-5 Sanyo Electric Co., Ltd. (72) Katsushi Onishi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 3B155 AA01 BB08 BB14 CB06 CB44 KA19 KA27 KA33 LA11 LA12 LA14 LB02 LB25 LB31 LC02 LC07 LC08 LC28 MA01 MA02 MA06 MA07 MA08

Claims (10)

[Claims] 1. A washing machine in which a washing and dewatering tub is rotatably arranged inside an outer tub, comprising: a) a water supply means for externally supplying water into the washing and dewatering tub; and b) a bottom of the washing and dewatering tub. A water circulating means for sucking the stored water, pushing it up to the top of the washing and dewatering tub and discharging it into the tub, c) a tub rotation driving means for rotating and driving the washing and dewatering tub, and d) supplying water by the water supply means. Operation control means for discharging water from the upper part of the washing and dewatering tub toward the inside of the washing and dewatering tub by the water circulating means while rotating the washing and dewatering tub at a low speed by the tub rotation driving means. Features washing machine. 2. An agitating blade rotatably disposed on an inner bottom portion of the washing and dewatering tub, and a blade rotation driving unit for rotating the agitating blade. From the start of the washing operation by rotating the stirring blade by the blade rotation drive means until a predetermined time has elapsed,
The washing machine according to claim 1, wherein the discharge of water by the water circulation means is continued. 3. A washing machine in which a washing and dewatering tub is rotatably disposed inside an outer tub, and a stirring blade is rotatably disposed on an inner bottom portion of the washing and dewatering tub. A) water supply means for supplying water from the boiler, b) water circulating means for sucking water stored at the bottom of the washing and dewatering tub, pushing up to the top of the washing and dewatering tub and discharging into the tub, and c) stirring blades. A blade rotation driving means for rotationally driving; d) a predetermined time after the water supply is substantially completed from the middle of the water supply by the water supply means, and a washing operation is started by rotating the stirring blade by the blade rotation driving means. And an operation control means for discharging water from the upper portion of the washing and dewatering tub into the washing dewatering tub by the water circulating means until elapses. 4. The method according to claim 2, wherein the end of the operation of the water circulating means is predetermined in consideration of a time when the detergent is almost completely dissolved or a time when the laundry is almost completely absorbed in water. The washing machine as described. 5. A water level detecting means for detecting a water level in the washing and dewatering tub, wherein the operation control means detects a decrease in the water level by the water level detecting means in a state where the water circulating means is operated, and the water level decreases. The washing machine according to any one of claims 1 to 4, wherein when the water supply is performed, the water supply unit is controlled to additionally supply water to a predetermined water level or a predetermined amount of water. 6. The operation control means detects a water level by the water level detection means after the operation of the water circulation means,
The washing machine according to any one of claims 1 to 5, wherein the water supply unit is controlled to additionally supply water to at least a predetermined water level. 7. The operation control means measures the accumulation of the operation time of the water circulation means from the start of the rotation control of the stirring blade first, and when the accumulated measurement time reaches a predetermined time, the operation control means The washing machine according to any one of claims 2 to 6, wherein the operation of the water circulation means is terminated. 8. The washing machine according to claim 2, wherein the operation control unit provides an operation period and an operation suspension period before the operation of the water circulation unit ends. 9. The washing machine according to claim 1, wherein the operation control means includes:
A first water flow that rotationally drives only the stirring blades in a predetermined pattern, and a second water flow that combines rotation of the washing and dewatering tub and rotation of the stirring blades are switched and executed, and during the execution period of the first water flow, 9. The washing machine according to claim 8, wherein the water circulation unit is operated, and the operation is temporarily stopped during the execution period of the second water flow. 10. The operation control means discharges water from the upper part of the washing and dewatering tub into the washing tub by the water circulating means at the time of water supply in the final rinsing step and / or also at the beginning of the rinsing operation. The washing machine according to claim 1.