CN115777033B

CN115777033B - Washing machine

Info

Publication number: CN115777033B
Application number: CN202180046046.5A
Authority: CN
Inventors: 川口智也
Original assignee: Qingdao Haier Washing Machine Co Ltd; Haier Smart Home Co Ltd; Aqua Co Ltd
Current assignee: Qingdao Haier Washing Machine Co Ltd; Haier Smart Home Co Ltd; Aqua Co Ltd
Priority date: 2020-06-29
Filing date: 2021-03-15
Publication date: 2024-01-26
Anticipated expiration: 2041-03-15
Also published as: CN115777033A; JP2022010785A; JP7503266B2; WO2022001181A1

Abstract

A washing machine capable of rotating a dewatering tub at a high speed to improve a dewatering rate during dewatering, comprising: a dewatering barrel, the bottom of which is provided with a pulsator; three or more baffles arranged on the inner circumferential surface of the dewatering barrel at equal intervals in the circumferential direction; the water injection device can independently inject adjusting water into each baffle plate; an acceleration detection unit for detecting vibration of the dewatering tub; a dehydration barrel position detection device which transmits a pulse signal corresponding to the rotation of the dehydration barrel; an eccentric detection unit for detecting the eccentric amount and eccentric position in the dewatering barrel; a water injection control unit for controlling the water injection device to inject water to the baffle plate corresponding to the eccentric position when the eccentric amount reaches a specified eccentric amount threshold value for water injection in the dehydration process; a maximum rotation speed determination unit for determining the maximum rotation speed in the dehydration process based on the water injection state of more than three baffle plates; and a motor control unit controlling a motor for rotationally driving the dewatering tub during dewatering.

Description

Washing machine

Technical Field

The present invention relates to a washing machine capable of eliminating unbalance of a dewatering tub in a state that the dewatering tub is continuously rotated, and suppressing vibration and noise caused by eccentricity of the dewatering tub during dewatering.

A general washing machine provided in a general home, a self-service laundry room, or the like has a dehydration tub having a plurality of water holes formed at an inner circumferential surface thereof. Therefore, water dehydrated from the laundry in the dehydration tub during dehydration is discharged to the outside of the dehydration tub through the plurality of water passing holes. In addition, when the bias of the laundry is large during the dewatering, the eccentricity of the dewatering tub during the rotation is large, and the rotation requires a large torque, so that the dewatering operation cannot be started.

Accordingly, patent document 1 discloses the following technique: when the laundry is dehydrated, the unbalance amount and the unbalance position of the laundry in the washing tub are detected, and when the unbalance exists, water is injected into a plurality of baffle plates uniformly arranged in the circumferential direction of the dehydrating tub, thereby actively eliminating the unbalance state of the dehydrating tub.

In the washing machine of patent document 1, in order to eliminate the unbalanced state of the dewatering tub, adjusting water in an amount corresponding to the unbalanced amount is injected into a baffle plate located on the opposite side of the unbalanced position of laundry in the washing tub. Therefore, when the spin basket is rotated after the adjustment water is injected, the bias of the laundry and the adjustment water injected to the baffle plate draw the spin basket by centrifugal force during the spin, thereby deforming the spin basket into an oval shape. When the dewatering drum is elliptical, noise is generated by the outer drum contacting the dewatering drum, and the dewatering drum is plastically deformed, so that it is difficult to rotate the dewatering drum at a high speed to increase the dewatering rate.

Background

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2017-56025

Disclosure of Invention

Problems to be solved by the invention

Accordingly, the present invention can provide a washing machine capable of rotating a dehydration tub at a high speed to increase a dehydration rate during dehydration.

Solution for solving the problem

The washing machine of the present invention is characterized by comprising: a dewatering barrel, the bottom of which is provided with a pulsator; three or more baffles arranged at equal intervals in the circumferential direction on the inner circumferential surface of the dewatering barrel; the water injection device can independently inject adjusting water into each baffle plate; an acceleration detection unit detecting vibration of the dehydration tub; a dehydration barrel position detecting device which transmits a pulse signal corresponding to the rotation of the dehydration barrel; an eccentric detection unit for detecting the eccentric amount and the eccentric position in the dewatering barrel; a water injection control unit for controlling the water injection device to inject water to the baffle plate corresponding to the eccentric position when the eccentric amount reaches a specified eccentric amount threshold value for water injection in the dehydration process; a maximum rotation speed determination unit that determines a maximum rotation speed during dehydration based on water injection states to the three or more baffles; and a motor control unit controlling a motor for rotationally driving the dewatering tub during dewatering.

In the washing machine of the present invention, it is preferable that the maximum rotation speed determining unit determines the maximum rotation speed during dehydration based on the water injection amount of water injected into the baffle plate.

In the washing machine of the present invention, it is preferable that the maximum rotation speed determining unit determines the maximum rotation speed during the dehydration based on the distribution of the baffles injected with water.

In the washing machine of the present invention, it is preferable that the washing machine has an outer tub in which the dehydrating tub is disposed, and the maximum rotation speed determining unit determines the maximum rotation speed during the dehydrating based on the amplitude of the outer tub.

In the washing machine of the present invention, it is preferable that the maximum rotation speed determining unit determines the maximum rotation speed during the dehydration based on a relationship between the position of the baffle to be injected and the deformation strength of the dehydration tub in the case where the deformation strength of the dehydration tub is not uniform in the circumferential direction.

Effects of the invention

According to the present invention, in order to eliminate the unbalanced state of the dewatering tub during the dewatering process, the adjusting water is injected into the baffle plate, and the maximum rotation speed during the dewatering process after the injection of the adjusting water is determined based on the water injection state of the baffle plate. Therefore, the maximum rotation speed in the dehydration process can be made as large as possible while inhibiting the dehydration barrel from deforming into an elliptical shape.

According to the present invention, deformation of the dehydrating tub into an elliptical shape can be suppressed by considering the bias of laundry and the magnitude of force of pulling the dehydrating tub by the centrifugal force of the adjusting water injected into the baffle plates during dehydration. This makes it possible to improve the dehydration rate by high-speed dehydration rotation while preventing contact between the outer tub and the dehydration tub and plastic deformation of the dehydration tub.

According to the present invention, by considering the distribution of the water-injected baffle plates, high-speed dehydration can be achieved.

According to the present invention, by considering the amplitude of the outer tub, it is possible to achieve high-speed dehydration while suppressing the generation of noise.

According to the present invention, an appropriate dehydration rotation speed can be selected by considering the deformation strength of the dehydration tub.

Drawings

Fig. 1 is a perspective view showing an external appearance of a washing machine 1 according to a first embodiment of the present invention.

Fig. 2 is a schematic view showing the structure of the washing machine 1 of fig. 1.

Fig. 3 is a partial plan view of the washing machine 1 of fig. 1, viewed from above.

Fig. 4 is a cross-sectional view of the dewatering tub 2 included in the washing machine 1 of fig. 1.

Fig. 5 (a) is a view of the baffle plate 8 formed on the inner peripheral surface 2a1 of the dewatering tub 2 as viewed from the inner peripheral side, and fig. 5 (b) is a view of fig. 5 (a) ₁ －a ₁ A cross-sectional view at line.

Fig. 6 is a block diagram of an electrical system of the washing machine 1 of fig. 1.

Fig. 7 is a view for explaining a deformed form of the dewatering tub 2.

Fig. 8 is a view for explaining a deformed state of the dewatering tub 2.

Fig. 9 shows a table of correspondence used by the maximum rotation speed determination unit 63a when determining the maximum rotation speed during dehydration.

Fig. 10 is a flowchart showing a control flow during the dehydration of the washing machine 1 of fig. 1.

Fig. 11 is a flowchart showing control of the water injection process of the first baffle plate of fig. 10.

Fig. 12 is a flowchart showing control of the water injection process of the second baffle of fig. 10.

Fig. 13 (a) is a diagram illustrating a method of manufacturing the dewatering tub 2 of the washing machine according to the second embodiment of the present invention, and fig. 13 (b) and 13 (c) are diagrams illustrating a deformed form of the dewatering tub 2.

Fig. 14 (a) is a schematic view of a dewatering tub 2 of a washing machine according to a second embodiment of the present invention, and fig. 14 (b) is a table used when determining the maximum rotation speed in the dewatering process by the maximum rotation speed determining unit 63 a.

Description of the reference numerals

1: a washing machine; 2: a dehydration barrel; 2c: the bottom of the dewatering barrel; 3: an outer tub; 4: a pulsator; 8: a baffle plate; 30: a water injection device; 55: proximity switch (dehydration tub position detection device); 56: an acceleration sensor (acceleration detection unit); 63a: a maximum rotation speed determination unit (maximum rotation speed determination means); 64: a motor control unit (motor control unit); 65: an unbalance amount detection section (eccentricity detection means); 66: an unbalanced position detection unit (eccentricity detection means); 68: water injection control part (water injection control unit).

Detailed Description

Hereinafter, the washing machine 1 according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings.

(first embodiment)

Fig. 1 is a perspective view showing an external appearance of a vertical washing machine (hereinafter, referred to as "washing machine") 1 according to a first embodiment of the present invention. Fig. 2 is a schematic diagram showing the structure of the washing machine 1 according to the present embodiment. Fig. 3 is a partial plan view of the washing machine 1 according to the present embodiment as viewed from above. Fig. 4 is a cross-sectional view of the dewatering tub 2 included in the washing machine 1.

The washing machine 1 of the present embodiment includes: the washing machine includes a washing machine main body 1a, a dewatering tub 2, an outer tub 3, a water receiving ring unit 5, a water injection device 30 (nozzle unit), a driving part 50, and a control unit 60 (see fig. 6).

The washing machine main body 1a shown in fig. 1 has a substantially rectangular parallelepiped shape. An opening 11 for allowing laundry to enter and exit the spin basket 2 is formed in the upper surface of the washing machine main body 1a, and an opening/closing cover 11a capable of opening and closing the opening 11 is attached.

The outer tub 3 is a bottomed tubular member disposed inside the washing machine main body 1a, and can store washing water therein. A drain port 10 is formed in the bottom surface of the outer tub 3, and a drain pipe 10a is connected to the drain port 10. As shown in fig. 2, an acceleration sensor 56 capable of detecting acceleration in both the horizontal and vertical directions is attached to the upper end portion of the outer peripheral surface 3a of the outer tub 3. In the present embodiment, the acceleration of the tub 3 is detected by the acceleration sensor 56, and the acceleration of the dewatering tub 2 is substantially the same as the acceleration of the tub 3.

The dewatering tub 2 is a bottomed tubular member that is disposed coaxially with the outer tub 3 in the outer tub 3 and rotatably supported. The dewatering tub 2 is capable of accommodating laundry therein, and has a wall surface 2a provided with a plurality of water through holes 2t (see fig. 5 a).

A pulsator (stirring blade) 4 is rotatably disposed in the center of the bottom 2c of the dewatering tub 2. As shown in fig. 2, the pulsator 4 has: a substantially disc-shaped pulsator main body 4a; a plurality of upper blade portions 4b formed on the upper surface of the pulsator body 4a; and a plurality of lower blade portions 4c formed on the lower surface of the pulsator body 4 a. Such pulsator 4 agitates the washing water stored in the outer tub 3 to generate a water current.

As shown in fig. 4, three baffles (water injection pipes) 8 as water passage pipe portions are provided on the inner peripheral surface 2a1 of the dewatering tub 2 at equal intervals (equal angles) in the circumferential direction. Each baffle plate 8 is formed to extend from the bottom 2c of the dewatering tub 2 to the upper end in the up-down direction and protrude from the inner peripheral surface 2a1 of the dewatering tub 2 toward the axis S1. The baffles 8 are hollow, and have a circular arc cross-sectional shape. In this way, the baffle plate 8 has a shape that protrudes to the axis S1 of the dewatering tub 2 little and expands in the circumferential direction of the dewatering tub 2, whereby the accommodation space of the dewatering tub 2 can be suppressed from narrowing.

As shown in fig. 2, a laterally long circulation nozzle 80 is formed at the upper end portion of such a baffle plate 8. Further, an opening 81 is formed at the lower end of the baffle plate 8, and the opening 81 opens near the bottom 2c of the dewatering tub 2, more specifically, below the pulsator main body 4 a.

Thus, in the drain valve 10a ₁ In the washing process in which the washing water is stored in the outer tub 3 while the washing water is closed (see fig. 2), as shown by an arrow in fig. 2, the washing water agitated by the lower blade portion 4c of the pulsator 4 enters from the opening 81, rises in the baffle plate 8, is discharged from the circulation water port 80, and sprays and washes the laundry. By repeating this operation, the washing water circulates in the dewatering tub 2. That is, the baffle plate 8 has a circulation function of the washing water.

A separation piece 8a extending from the circulation nozzle 80 to a position close to the inner peripheral surface 2a1 of the dewatering tub 2 is provided near the upper end in the baffle plate 8. The separator 8a extends radially outward from the upper edge of the circulating nozzle 80, and then is bent downward. A gap 8b (see fig. 2) is formed between the separator 8a and the inner peripheral surface 2a1 of the dewatering tub 2, and the adjustment water supplied from the water receiving ring unit 5 flows downward through the gap 8 b.

As shown in fig. 3, the water receiving ring unit 5 is a member formed by overlapping three layers in the radial direction of the water guide grooves 5a, 5b, 5c, which are annular and open upward, toward the axis S1 of the dewatering tub 2, and is fixed to the upper end portion of the inner peripheral surface 2a1 of the dewatering tub 2 as shown in fig. 2. The water guide grooves 5a, 5b, 5c are formed in the same number as the baffles 8, and are formed so that the adjustment water independently flows to any baffle 8.

As shown in fig. 3, an opening 5A that opens radially outward is formed at the lower end of the water guide 5A, and the water guide 5A communicates with the inside of the baffle plate 8. An opening 5B that opens radially outward is formed in the lower end portion of the water guide 5B, and the interiors of the water guide 5B and the baffle plate 8 communicate with each other via a water passage 5Ba that passes through the lower portion of the water guide 5 a. An opening 5C that opens radially outward is formed in the lower end portion of the water guide 5C, and the interiors of the water guide 5C and the baffle plate 8 communicate with each other via a water passage 5Ca that passes through the lower portions of the water guide 5a and the water guide 5 b.

A ring-shaped fluid balancer 12 is mounted on the outer peripheral side of the water receiving ring unit 5. The fluid balancer 12 is the same as known fluid balancers.

The water injection device 30 is a member for injecting the adjustment water independently into the water guide grooves 5a, 5b, and 5 c. The water injection device 30 includes three water injection nozzles 30a, 30b, 30c disposed above the water guide grooves 5a, 5b, 5c, and water supply valves 31a, 31b, 31c connected to the water injection nozzles 30a, 30b, 30c, respectively. The water injection nozzles 30a, 30b, and 30c are provided in the same number as the water guide grooves 5a, 5b, and 5c, and are mounted at positions where water can be injected into the water guide grooves 5a, 5b, and 5c, respectively, in the upper end portion of the outer tub 3. In the present embodiment, tap water may be used as the adjustment water. Further, the water supply valves 31a, 31b, 31c may employ reversing water supply valves.

The driving unit 50 shown in fig. 2 rotates the pulley 52 and the belt 53 by the motor 51, and rotates the driving shaft 54 extending toward the bottom 2c of the dewatering tub 2, thereby imparting driving force to the dewatering tub 2 and the pulsator 4, and rotating the dewatering tub 2 and the pulsator 4. The washing machine 1 mainly rotates only the pulsator 4 during washing, and integrally rotates the spin basket 2 and the pulsator 4 at a high speed during dehydration. A proximity switch 55 capable of detecting the passage of the mark 52a formed on the pulley 52 is provided near one pulley 53.

As shown in fig. 5 (b), a protruding wall 82 protruding radially inward is provided near the lower end of the inner peripheral side wall of the baffle plate 8. That is, a part of the inner peripheral side wall of the baffle plate 8 protrudes radially inward. As shown in fig. 5 (a), a water receiving plate 85 protruding radially inward from the outer peripheral side wall thereof is formed inside the baffle plate 8.

The water receiving plate 85 is disposed at the same height as the protruding wall 82, and a radially inner end 85a of the water receiving plate 85 is disposed inside the protruding wall 82. A space is formed between the radially inner end 85a of the water receiving plate 85 and the distal inner peripheral surface of the protruding wall 82, and the adjustment water supplied to the water storage space 8Ta flows into the drain space 8Tb through the space.

The internal space of the baffle 8 has: the water storage space 8Ta is disposed above the protruding wall 82 provided with the water receiving plate 85; and a drain space 8Tb disposed below the protruding wall 82. The water storage space 8Ta is a space for storing the adjustment water from the water guide grooves 5a, 5b, 5c, and the drain space 8Tb is a space for draining the adjustment water flowing out of the water storage space 8 Ta.

As shown in fig. 5 (a) and 5 (b), the radial thickness of the water storage space 8Ta is substantially the same as the radial thickness of the drain space 8Tb, whereas the length of the drain space 8Tb in the up-down direction is shorter than the length of the water storage space 8Ta in the up-down direction. The circumferential length of the water storage space 8Ta is formed longer than the circumferential length of the drain space 8 Tb. Therefore, the volume of the water storage space 8Ta is larger than the volume of the drain space 8 Tb.

The adjustment water injected into the water storage space 8Ta of the baffle plate 8 is held by the water receiving plate 85 disposed in the protruding wall 82 so as not to flow downward, and flows radially inward in the protruding wall 82 along the upper surface of the water receiving plate 85. When the adjustment water is injected into the water storage space 8Ta of the baffle plate 8 in a state where the dewatering tub 2 is rotated, the adjustment water is attached to the outer peripheral walls of the water guide grooves 5a, 5b, 5c by centrifugal force, and thus the adjustment water is held in the water storage space 8 Ta.

Fig. 6 is a block diagram showing an electrical configuration of the washing machine 1 according to the present embodiment. The operation of the washing machine 1 is controlled by a control unit 60 including a microcomputer. The control unit 60 includes a central control unit (CPU) 61 for controlling the entire system, and a memory 62 is connected to the control unit 60, and a low-speed rotation setting value (N1) at the time of low-speed dehydration operation, a high-speed rotation setting value (N2) at the time of high-speed dehydration operation, and a first eccentricity threshold value (eccentricity threshold value) at the time of low-speed dehydration operation, which are required for rotation control of the dehydration tub 2, are stored in the memory 62 (ma ₁ ) A second threshold value (eccentricity threshold value) for high-speed dewatering operation (ma) ₂ ) First acceleration threshold (mc) at low-speed dewatering operation ₁ ) And a second acceleration threshold (mc) at the time of high-speed dehydration operation ₂ ). The microcomputer is caused by the control unit 60 to execute the program stored in the memory 62, thereby performing a predetermined operation, and the memory 62 temporarily stores data and the like used when executing the program.

The central control unit 61 outputs a control signal to the rotation speed control unit 63, and further outputs the control signal to the motor control unit (motor control circuit) 64 to control the rotation of the motor 51. The rotation speed control unit 63 is connected to the maximum rotation speed determination unit 63a, and performs rotation control of the motor 51 so that the maximum rotation speed during dehydration is the maximum rotation speed determined by the maximum rotation speed determination unit 63 a. The rotation speed control unit 63 receives a signal indicating the rotation speed of the motor 51 from the motor control unit 64 in real time, and becomes a control element. The acceleration sensor 56 is connected to the unbalance amount detection section 65, and the acceleration sensor 56 and the proximity switch 55 are connected to the unbalance position detection section 66.

Thus, when the proximity switch 55 senses the mark 52a (see fig. 2), the unbalance amount (M) is calculated in the unbalance amount detection section 65 based on the magnitudes of the accelerations in the horizontal direction and the vertical direction from the acceleration sensor 56, and the unbalance amount is output to the unbalance amount determination section 67. The unbalanced position detection unit 66 calculates an angle of the unbalanced direction from the signal indicating the position of the marker 52a input from the proximity switch 55, and outputs an unbalanced position signal to the water injection control unit 68.

When signals indicating the unbalance amount and the unbalance position from the unbalance amount determination section 67 and the unbalance position detection section 66 are input to the water injection control section 68, the water injection control section 68 determines whether or not to supply water and the water supply amount to any one of the baffles 8 in the dewatering tub 2 based on a control program stored in advance. Then, the selected water supply valves 31a, 31b, 31c are opened, and the water injection is started to be adjusted. When unbalance occurs in the dewatering tub 2, injection of the adjustment water from the water injection nozzles 30a, 30b, 30c selected based on the calculation of the unbalance amount into the water guide grooves 5a, 5b, 5c of the water receiving ring unit 5 is started, and when unbalance is eliminated by the baffle plate 8, injection of the adjustment water is stopped.

For example, as shown in fig. 4, when the cake D (X) of the laundry, which is a factor of the eccentricity, is located between the baffle plate 8 (B) and the baffle plate 8 (C) of the dewatering tub 2, the water injection control unit 68 controls the water injection device 30 to supply the adjustment water to the baffle plate 8 (a). When the cake D (Y) of the laundry is located near the baffle plate 8 (a), the water injection device 30 is controlled to supply the adjustment water to both the baffle plate 8 (B) and the baffle plate 8 (C).

The maximum rotation speed determination unit 63a determines the maximum rotation speed during dehydration based on the water injection amount of water injected into the baffle 8, the distribution of the injected baffle 8, and the amplitude of the outer tub 3.

As has been described in the prior art, after the adjustment water is injected into the baffle plate 8 in order to eliminate the unbalanced state of the dewatering tub 2 during the dewatering, when the dewatering tub 2 rotates, the eccentric load (bias of laundry) and the adjustment water injected into the baffle plate 8 pull the dewatering tub 2 due to the centrifugal force during the dewatering each other, thereby deforming the dewatering tub 2 into an elliptical shape. When the dewatering tub 2 is deformed into an oval shape, there are problems as follows: the gap between the outer tub 3 and the dehydrating tub 2 becomes smaller, and the outer tub 3 contacts the dehydrating tub 2 to generate noise. Further, there is a problem in that the dewatering tub 2 is plastically deformed.

(regarding the amount of Water injection)

Fig. 7 (a) shows a state in which the adjustment water is injected into one baffle plate 8 in order to eliminate a large unbalanced state of the dewatering tub 2 during the dewatering process, and fig. 7 (b) shows a state in which the adjustment water is injected into one baffle plate 8 in order to eliminate a small unbalanced state of the dewatering tub 2 during the dewatering process.

The larger the unbalanced state of the dewatering tub 2, the more water injection amount of water to be injected into the baffle plate 8 is required to eliminate the unbalanced state, and the smaller the unbalanced state of the dewatering tub 2, the less water injection amount of water to be injected into the baffle plate 8 is required to eliminate the unbalanced state.

In the case of eliminating a large unbalanced state of the dewatering tub 2, as shown in fig. 7 (a), the eccentric load (bias of laundry) and the force of the adjustment water injected into the baffle plate 8 act on the portion of the dewatering tub 2 which is approximately 180 ° apart in the circumferential direction by the centrifugal force at the time of dewatering, but since both the eccentric load and the water injection amount of the water injected into the baffle plate 8 are large, the two forces acting on the dewatering tub 2 in opposite directions are large, and the dewatering tub 2 is easily deformed into an elliptical shape.

In contrast, when the unbalanced state of the dewatering tub 2 is eliminated, as shown in fig. 7 (b), the eccentric load (bias of laundry) and the force of the adjustment water injected into the baffle plate 8 act on the portion of the dewatering tub 2 which is approximately 180 ° apart in the circumferential direction by the centrifugal force during dewatering, but since both the eccentric load and the water injection amount of the water injected into the baffle plate 8 are small, the two forces acting on the dewatering tub 2 in the opposite directions are small, and the dewatering tub 2 is less likely to be deformed into an elliptical shape, as compared with the case where the two forces acting on the dewatering tub 2 in the opposite directions are large as shown in fig. 10 (a).

Accordingly, the higher the water injection amount of water injected into the baffle 8, the harder the dewatering tub 2 is deformed into an elliptical shape, so the highest rotation speed determining unit 63a determines the highest rotation speed in the dewatering process as a large rotation speed, and the higher the water injection amount of water injected into the baffle 8, the easier the dewatering tub 2 is deformed into an elliptical shape, so the highest rotation speed determining unit 63a determines the highest rotation speed in the dewatering process as a small rotation speed.

(distribution of baffles 8 with respect to water being injected)

Fig. 8 (a) shows a state in which the adjustment water is injected into one baffle plate 8 in order to eliminate the unbalanced state of the dewatering tub 2 during the dewatering process, and fig. 8 (b) shows a state in which the adjustment water is injected into both baffle plates 8 in order to eliminate the unbalanced state of the dewatering tub 2 during the dewatering process.

As shown in fig. 8 (a), when the adjustment water is injected into one baffle plate 8, the centrifugal force during dehydration causes the eccentric load (bias of laundry) and the force of the adjustment water injected into the baffle plate 8 to act on the portion of the dewatering tub 2 which is substantially 180 ° apart in the circumferential direction. At this time, two forces act on the dewatering tub 2 in opposite directions, and thus the dewatering tub 2 is easily deformed into an elliptical shape.

On the other hand, when the adjustment water is injected into the two baffles 8, as shown in fig. 8 (b), the centrifugal force during dehydration causes the eccentric load (bias of laundry) and the force of the adjustment water injected into the baffles 8 to act on the portion of the dewatering tub 2 that is approximately 120 ° apart. At this time, three forces uniformly act on the dewatering tub 2 at approximately 120 ° intervals, and thus the dewatering tub 2 is less likely to be deformed into an elliptical shape than in the case where two forces act on the dewatering tub 2 in opposite directions as shown in fig. 8 (a).

Thus, when the adjustment water is injected into the two baffles 8, the dewatering tub 2 is difficult to deform into an elliptical shape, and therefore the maximum rotation speed determination unit 63a determines the maximum rotation speed during dewatering to be a large rotation speed, and when the adjustment water is injected into one baffle 8, the dewatering tub 2 is easy to deform into an elliptical shape, and therefore the maximum rotation speed determination unit 63a determines the maximum rotation speed during dewatering to be a small rotation speed.

(amplitude for outer tub 3)

The larger the amplitude of the outer tub 3 is, the smaller the gap between the washing machine body 1a and the outer tub 3 becomes, the easier the washing machine body 1a and the outer tub 3 are contacted, and the smaller the gap between the outer tub 3 and the dehydrating tub 2 becomes, the easier the outer tub 3 and the dehydrating tub 2 are contacted, and noise is generated.

Thus, the maximum rotation speed determination unit 63a determines the maximum rotation speed during dehydration to be a larger rotation speed as the amplitude of the outer tub 3 is smaller, and the maximum rotation speed determination unit 63a determines the maximum rotation speed during dehydration to be a smaller rotation speed as the amplitude of the outer tub 3 is smaller.

Fig. 9 shows a table of correspondence used by the maximum rotation speed determination unit 63a when determining the maximum rotation speed during dehydration. Fig. 9 (a) is a table corresponding to the case where the adjustment water is injected into one baffle plate 8, and fig. 9 (b) is a table corresponding to the case where the adjustment water is injected into both baffle plates 8.

As shown in fig. 9 (a), when the water injection amount to the baffle a is 300g or less, the water injection amount to the baffles B and C is 0, and the amplitude of the outer tub 3 is 1mm or less, the maximum rotation speed determining unit 63a determines the maximum rotation speed during dehydration to 1200rpm, whereas when the water injection amount to the baffle a is 600g or less, the water injection amount to the baffles B and C is 0, and the amplitude of the outer tub 3 is 1mm or less, the maximum rotation speed determining unit 63a determines the maximum rotation speed during dehydration to 1100rpm.

As described above, the maximum rotation speed determination unit 63a determines the maximum rotation speed during dehydration to be a smaller rotation speed as the water injection amount of water injected into the baffle 8 increases.

As shown in fig. 9 (a), when the water injection amount to the baffle a is 300g or less, the water injection amounts to the baffles B and C are 0, and the amplitude of the outer tub 3 is 1mm or less, the maximum rotation speed determination unit 63a determines the maximum rotation speed during dehydration to 1200rpm, whereas when the water injection amount to the baffle a is 300g or less, the water injection amount to the baffles B and C is 0, and the amplitude of the outer tub 3 is 3mm or less, the maximum rotation speed determination unit 63a determines the maximum rotation speed during dehydration to 1100rpm.

As described above, the maximum rotation speed determination unit 63a determines the maximum rotation speed during dehydration to be a smaller rotation speed as the amplitude of the tub 3 is larger.

Fig. 9 (a) shows a table corresponding to the case where water was injected into the baffle a and not into the baffle B, C, and the same applies to the table corresponding to the case where water was injected into the baffle B and not into the baffle A, C and the case where water was injected into the baffle C and not into the baffle A, B.

As shown in fig. 9B, when the water injection amount to the baffle a is 300g or less, the water injection amount to the baffle B is 300g or less, the water injection amount to the baffle C is 0, the water injection difference between the baffles (the difference between the water injection amount to the baffle a and the water injection amount to the baffle B) is 50g or less, and the amplitude of the outer tub 3 is 1mm or less, the maximum rotation speed determining unit 63a determines the maximum rotation speed during dehydration to 1400rpm, whereas when the water injection amount to the baffle a is 600g or less, the water injection amount to the baffle B is 600g or less, the water injection amount to the baffle C is 0, the water injection difference between the baffles (the difference between the water injection amount to the baffle a and the water injection amount to the baffle B) is 50g or less, and the amplitude of the outer tub 3 is 1mm or less, the maximum rotation speed determining unit 63a determines the maximum rotation speed during dehydration to 1400rpm.

As described above, basically, the higher the water injection amount into the baffle plates 8, the higher the maximum rotation speed determining unit 63a determines the maximum rotation speed during dehydration to be the lower rotation speed, and when the adjustment water is injected into the two baffle plates 8, the higher the maximum rotation speed determining unit 63a determines the maximum rotation speed during dehydration to be the same rotation speed even if the water injection amounts into the baffle plates 8 are different. That is, when the adjustment water is injected into the two baffles 8, the dewatering tub 2 is difficult to deform into an elliptical shape, and the distribution of the baffles 8 to be injected with water has a large influence on whether the dewatering tub 2 is deformed into an elliptical shape or not, and the influence on the injection amount of water into the baffles 8 is small.

As shown in fig. 9B, when the water injection amount to the baffle a is 300g or less, the water injection amount to the baffle B is 300g or less, the water injection amount to the baffle C is 0, the water injection difference between the baffles (the difference between the water injection amount to the baffle a and the water injection amount to the baffle B) is 50g or less, and the amplitude of the outer tub 3 is 1mm or less, the maximum rotation speed determination unit 63a determines the maximum rotation speed during dehydration to 1400rpm, whereas when the water injection amount to the baffle a is 300g or less, the water injection amount to the baffle B is 300g or less, the water injection amount to the baffle C is 0, the water injection difference between the baffles (the difference between the water injection amount to the baffle a and the water injection amount to the baffle B) is 50g or less, and the amplitude of the outer tub 3 is 3mm or less, the maximum rotation speed determination unit 63a determines the maximum rotation speed during dehydration to 1200rpm.

Note that fig. 9 (B) shows a table corresponding to the case where water is injected into the baffle A, B and not into the baffle C, and the same is true for the case where water is injected into the baffle A, C and not into the baffle B and the case where water is injected into the baffle B, C and not into the baffle a.

Further, as shown in fig. 9 (a), when the water injection amount to the baffle a is 600g or less, the water injection amount to the baffle B, C is 0, and the amplitude of the tub 3 is 1mm or less, the maximum rotation speed determining unit 63a determines the maximum rotation speed during dehydration to 1100rpm, whereas as shown in fig. 9 (B), when the water injection amount to the baffle a is 300g or less, the water injection amount to the baffle B is 300g or less, the water injection amount to the baffle C is 0, the water injection difference between the baffles (the difference between the water injection amount to the baffle a and the water injection amount to the baffle B) is 50g or less, and the amplitude of the tub 3 is 1mm or less, the maximum rotation speed determining unit 63a determines the maximum rotation speed during dehydration to 1400rpm.

As described above, when the injection amounts of the adjustment water to the baffles 8 are substantially the same, the maximum rotation speed determination unit 63a determines the maximum rotation speed during dehydration to be a larger rotation speed when the adjustment water is injected to both baffles 8 than when the adjustment water is injected to one baffle 8.

Fig. 10 is a flowchart showing control of the washing machine 1 according to the present embodiment. In the present embodiment, when the central control unit 61 receives an input signal from a not-shown dehydration button or a signal for starting the dehydration process during the washing mode operation, the flow proceeds to step SP1, and the dehydration process is started.

< step SP1 >)

In step SP1, the central control unit 61 unwinds and reverses the dewatering tub 2, and then accelerates the rotation of the dewatering tub 2 based on the low-speed rotation setting value (N1).

< step SP2 >)

In step SP2, the central control section 61 detects the unbalance amount (M) based on the acceleration value (x component of the acceleration sensor) given by the acceleration sensor 56, and compares the unbalance amount (M) with the first eccentricity threshold value (ma ₁ ) Comparing and judging M < ma ₁ Whether or not it is. When M is less than ma ₁ When established, the process proceeds to step SP3. On the other hand, when M < ma is judged ₁ If not, the process proceeds to step SP4. Wherein the first eccentricity threshold (ma ₁ ) Is a threshold value indicating that the bias of the laundry is small to such an extent that noise is not generated even if the adjustment water is not supplied to the baffle plate 8. That is, when it is determined that the unbalanced load is small or no load exists, no noise is generated even if water is not supplied to the baffle plate 8, and the process proceeds to step SP3.

< step SP3 >

In step SP3, the central control unit 61 accelerates the rotation of the dewatering tub 2 based on the high-speed rotation setting value (N2).

< step SP4 >)

In step SP4, the central control unit 61 performs the first baffle water injection process to eliminate the bias of the laundry. The flow of the water injection process of the first baffle is described below.

< step SP5 >)

In step SP5, the central control unit 61 determines whether or not the rotational speed of the dewatering tub 2 has reached a predetermined rotational speed (for example, 500 rpm). The predetermined rotational speed is a rotational speed at which substantially all water is dehydrated from laundry, and varies according to the diameter of the dehydrating tub 2. When the central control unit 61 determines that the rotational speed of the dewatering tub 2 has reached the predetermined rotational speed, the process proceeds to step SP6. In contrast, when the central control unit 61 determines that the rotational speed of the dewatering tub 2 has not reached the predetermined rotational speed, the routine returns to step SP2, and steps SP2 to SP4 are repeated.

< step SP6 >)

In step SP6, the central control section 61 detects the unbalance amount (M) based on the acceleration value (x component of the acceleration sensor) given by the acceleration sensor 56, and calculates the second eccentricity threshold value (ma ₂ ) Comparing and judging M < ma ₂ Whether or not it is. When M is less than ma ₂ When it is established, the process proceeds to step SP7. On the other hand, when M < ma is judged ₂ If not, the process proceeds to step SP8. Wherein the second eccentricity threshold (ma ₂ ) Is greater than a first eccentricity threshold (ma ₁ ) The small value is a threshold value indicating that the bias of the laundry is small enough that no noise is generated even if the adjustment water is not supplied to the baffle plate 8. That is, when it is determined that the unbalanced load is small or no load exists, no noise is generated even if water is not supplied to the baffle plate 8, and the process proceeds to step SP3.

< step SP7 >)

In step SP7, the central control unit 61 accelerates the rotation of the dewatering tub 2 based on the high-speed rotation setting value (N2).

< step SP8 >)

In step SP8, the central control unit 61 performs the second baffle water injection process to eliminate the bias of the laundry. The flow of the water injection process of the second baffle is described below.

< step SP9 >

In step SP9, the central control unit 61 acquires the amplitude data and the unbalance position (N) data of the outer tub 3.

< step SP10 >)

In step SP10, the central control unit 61 acquires the distribution of the water-filled baffle plates 8 in the dewatering tub 2. After that, step SP7 is entered.

< step SP11 >)

At the step ofIn step SP11, the central control unit 61 determines the maximum rotation speed during the dehydration based on the water injection amount to the baffle 8, the distribution of the baffle 8 to be injected, and the amplitude of the tub 3. The water injection amount of water injected into the baffle plate 8 and the distribution of the baffle plate 8 to be injected are the water injection amount and the distribution when the rotation speed of the dewatering tub 2 is accelerated to the highest rotation speed. The vibration amplitude of the outer tub 3 is that water injection is completed when the rotation speed of the dewatering tub 2 is a prescribed rotation speed (e.g., 500 rpm) and M < ma ₂ Amplitude at the time of establishment.

In step SP11, the central control unit 61 calculates the water injection amount of water injected into the baffle plates 8 based on the water injection times ta, tb, and tc of water injected into the three baffle plates 8 in the first baffle plate water injection process and the second baffle plate water injection process. That is, the central control unit 61 controls the water injection device 30 to inject the regulated water at a predetermined flow rate from the three water injection nozzles 30a, 30b, and 30c, respectively, when injecting water into the baffle plate 8. Therefore, the central control unit 61 calculates the water injection amount of water injected into the baffle plates 8 based on the predetermined flow rate and the water injection times ta, tb, and tc of water injected into the three baffle plates 8.

< step SP12 >)

In step SP12, the central control unit 61 rotates the dewatering tub 2 at the maximum rotation speed for a predetermined time to perform dewatering treatment. After that, the dehydration treatment is ended.

Fig. 11 is a flowchart showing control of the first baffle water injection process shown in SP4 of fig. 10.

< step SP101 >)

In step SP101, the central control section 61 acquires the amplitude amount data and the unbalance amount (M) and unbalance position (N) data of the outer tub 3 based on the acceleration value given by the acceleration sensor 56.

< step SP102 >)

In step SP102, the central control unit 61 performs water injection treatment on the baffle plate 8 facing the unbalanced position (N).

< step SP103 >)

In step SP103, the central control unit 61 measures the water injection times ta, tb, and tc for injecting water into the three baffles 8, respectively.

Step SP104 >, step

In step SP104, the central control section 61 detects the unbalance amount (M) based on the acceleration value (x component of the acceleration sensor) given by the acceleration sensor 56, and calculates the first acceleration threshold value (mc) for the unbalance amount (M) and the first acceleration threshold value (mc) stored in the memory 62 ₁ ) Comparing and judging M < mc ₁ Whether or not it is. When M < mc is judged ₁ When established, the process proceeds to step SP105. On the other hand, when M < mc is judged ₁ If not, the process returns to step SP102. Here, the first acceleration threshold (mc ₁ ) Is a threshold value indicating that the bias of the laundry is small to such an extent that noise is not generated even when the injection of the adjustment water into the baffle plate 8 is stopped. That is, when the offset load becomes smaller, the process proceeds to step SP105.

< step SP105 >)

In step SP105, the central control unit 61 determines whether or not data of water filling times ta, tb, and tc for filling water into the three baffles 8 are present. When the central control unit 61 determines that the data of the water filling times ta, tb, and tc for filling the three baffles 8 are present, the flow proceeds to step SP106. In contrast, when the central control unit 61 determines that the data of the water injection times ta, tb, and tc for injecting water into the three baffles 8 does not exist, the flow proceeds to step SP107.

Step SP106 >, step

In step SP106, the central control unit 61 adds the water injection times ta, tb, tc for injecting water into the three baffles 8 to the previous water injection times ta, tb, tc.

< step SP107 >)

In step SP107, the central control unit 61 sets the water injection time to the three baffles 8 to ta, tb, and tc, and ends the process.

Fig. 12 is a flowchart showing control of the second baffle water injection process shown in SP8 of fig. 10.

< step SP201 >

In step SP201, the central control section 61 acquires the amplitude amount data and the unbalance amount (M) and unbalance position (N) data of the outer tub 3 based on the acceleration value given by the acceleration sensor 56.

< step SP202 >)

In step SP202, the central control unit 61 performs water injection treatment on the baffle plate 8 facing the unbalanced position (N).

< step SP203 >)

In step SP203, the central control unit 61 measures the water injection times ta, tb, and tc for injecting water into the three baffles 8, respectively.

< step SP204 >

In step SP204, the central control section 61 detects the unbalance amount (M) based on the acceleration value (x component of the acceleration sensor) given by the acceleration sensor 56, and calculates the second acceleration threshold value (mc) stored in the memory 62 for the unbalance amount (M) ₂ ) Comparing and judging M < mc ₂ Whether or not it is. When M < mc is judged ₂ When established, the process proceeds to step SP205. On the other hand, when M < mc is judged ₂ If not, the process returns to step SP202. Here, the second acceleration threshold (mc ₂ ) Is less than a first acceleration threshold (mc ₁ ) The value (c) is a threshold value indicating that the bias of the laundry is small enough that no noise is generated even when the injection of the adjustment water into the baffle plate 8 is stopped. That is, when the offset load becomes smaller, the process proceeds to step SP205.

< step SP205 >)

In step SP205, the central control unit 61 determines whether or not data of water filling times ta, tb, and tc for filling water into the three baffles 8 are present. When the central control unit 61 determines that the data of the water filling times ta, tb, and tc for filling the three baffles 8 are present, the process proceeds to step SP206. In contrast, when the central control unit 61 determines that the data of the water injection times ta, tb, and tc for injecting water into the three baffles 8 does not exist, the flow proceeds to step SP207.

< step SP206 >)

In step SP206, the central control unit 61 adds the water injection times ta, tb, tc for injecting water into the three baffles 8 to the previous water injection times ta, tb, tc.

Step SP207 >, step

In step SP207, the central control unit 61 sets the water injection times to ta, tb, and tc for water injection into the three baffles 8, and ends the process.

As described above, the washing machine 1 of the present embodiment includes: a dewatering barrel 2, the bottom 2c is provided with a pulsator 4; three or more baffles 8 are arranged on the inner peripheral surface 2a1 of the dewatering tub 2 at equal intervals in the circumferential direction; a water injection device 30 capable of independently injecting adjustment water into each baffle plate 8; an acceleration sensor 56 as acceleration detection means for detecting vibration of the dewatering tub 2; a proximity switch 55 as a dehydration tub position detecting device for transmitting a pulse signal in response to the rotation of the dehydration tub 2; an unbalance amount detecting section 65 and an unbalance position detecting section 66 as eccentric detecting means for detecting an eccentric amount and an eccentric position in the dewatering tub 2; a water injection control unit 68 as water injection control means for controlling the water injection device 30 to inject water into the baffle plate 8 corresponding to the eccentric position when the eccentric amount reaches a predetermined eccentric amount threshold value for water injection during dehydration; a maximum rotation speed determination unit 63a as maximum rotation speed determination means for determining the maximum rotation speed during dehydration based on the water injection state to three or more baffles 8; and a motor control unit 64 as a motor control unit for controlling the motor 51 for rotationally driving the dewatering tub 2 during dewatering.

When such a structure is adopted, the baffle plate 8 is injected with the adjusting water in order to eliminate the unbalanced state of the dewatering tub 2 during the dewatering process, and the maximum rotation speed during the dewatering process is determined based on the water injection state of the baffle plate 8. Therefore, the maximum rotation speed during dehydration can be made as large as possible while suppressing deformation of the dehydration tub 2 into an elliptical shape.

In the washing machine 1 of the present embodiment, the maximum rotation speed determination unit 63a determines the maximum rotation speed during dehydration based on the water injection amount of water injected into the baffle 8.

With such a configuration, deformation of the dewatering tub 2 into an elliptical shape can be suppressed by taking into consideration the bias of laundry and the force with which the adjustment water injected into the baffle plate 8 pulls the dewatering tub 2 due to the centrifugal force during dewatering. This can prevent contact between the outer tub 3 and the dewatering tub 2 and plastic deformation of the dewatering tub 2, and can improve the dewatering rate by high-speed dewatering rotation.

In the washing machine 1 of the present embodiment, the maximum rotation speed determination unit 63a determines the maximum rotation speed during dehydration based on the distribution of the water injected baffle 8.

When such a structure is adopted, the water is more rapidly dehydrated by taking into consideration the distribution of the water-injected baffle plates 8.

In the washing machine 1 of the present embodiment, the outer tub 3 having the dewatering tub 2 disposed therein is provided, and the maximum rotation speed determining unit 63a determines the maximum rotation speed during dewatering based on the amplitude of the outer tub 3.

When such a structure is adopted, the vibration amplitude of the outer tub 3 is taken into consideration, whereby high-speed dehydration can be achieved while suppressing the occurrence of noise.

(second embodiment)

The washing machine of the present embodiment is different from the washing machine of the first embodiment in that: the maximum rotation speed determination unit 63a determines the maximum rotation speed during dehydration in consideration of the deformation strength of the dehydration tub 2. The same parts of the structure of the washing machine of the present embodiment as those of the washing machine of the first embodiment will be omitted from detailed description.

In the vertical washing machine of the present embodiment, as shown in fig. 13 (a), the cylindrical portion of the spin basket 2 is formed by forming a metal flat plate-like member into a cylindrical shape, and connecting both ends of the flat plate-like member by welding, for example. The strength of the dewatering tub 2 becomes large at the connection portion thereof in the circumferential direction, and thus the deformation strength of the dewatering tub 2 is not uniform in the circumferential direction.

The eccentric load (bias of laundry) after water is injected into the baffle plate 8 and the force of the adjustment water injected into the baffle plate 8 to pull the dewatering tub 2 due to the centrifugal force during dewatering are considered.

As shown in fig. 13 (b), a force in opposite directions acts on a portion T other than the connection portion of the dewatering tub 2 ₁ And with the part T ₁ Opposed portions T ₂ In the case of the dewatering tub 2, the deformation strength is small, and thus the dewatering tub 2 is easily deformed into an elliptical shape.

In contrast, as shown in fig. 13 (c), a force in opposite directions acts on the portion T of the joint portion of the dewatering tub 2 ₃ And with the part T ₃ Opposed portions T ₄ In the case of (2), the deformation strength of the dewatering tub 2 is large, and thus the dewatering tub 2 is difficult to deform into an elliptical shape.

In the washing machine of the present embodiment, as shown in fig. 14 (a), a baffle plate 8 (a) is disposed at a connection portion of the dewatering tub 2, and a baffle plate 8 (B) and a baffle plate 8 (C) are disposed at portions other than the connection portion of the dewatering tub 2.

In the first embodiment, when the adjustment water is injected into one baffle plate 8, the highest rotation speed in the dehydration process is determined to be approximately the same rotation speed when the water is injected into the baffle plate 8 (a), the water is injected into the baffle plate 8 (B), and the water is injected into the baffle plate 8 (C).

In contrast, in the present embodiment, the maximum rotation speed determination unit 63a determines the maximum rotation speed during dehydration based on the relationship between the position of the water injected baffle 8 and the deformation strength of the dehydration tub 2.

That is, when the eccentric load and the force of pulling the dewatering tub 2 by the centrifugal force at the time of dewatering are the same as each other by the adjustment water injected into the baffle plate 8, the dewatering tub 2 is difficult to deform into an elliptical shape when the water is injected into the baffle plate 8 (a) disposed at the connection portion of the dewatering tub 2, and therefore the highest rotation speed during dewatering is determined to be a large rotation speed as compared with the case of injecting the water into the baffle plate 8 (B) or the baffle plate 8 (C) disposed at a position different from the connection portion of the dewatering tub 2.

Fig. 14 (b) is a table for use by the maximum rotation speed determination unit 63a in determining the maximum rotation speed during dehydration, and shows a part of the table in the case where the adjustment water is injected into one baffle plate 8.

As shown in fig. 14 (B), when the water injection amount to the baffle B is 300g or less, the water injection amount to the baffle A, C is 0, and the amplitude of the outer tub 3 is 1mm or less, the maximum rotation speed determining unit 63a determines the maximum rotation speed during dehydration to 1200rpm, and similarly, when the water injection amount to the baffle C is 300g or less, the water injection amount to the baffle A, B is 0, and the amplitude of the outer tub 3 is 1mm or less, the maximum rotation speed determining unit 63a determines the maximum rotation speed during dehydration to 1200rpm.

On the other hand, when the water injection amount to the baffle plate a was 300g or less, the water injection amount to the baffle plate B, C was 0, and the amplitude of the outer tub 3 was 1mm or less, the maximum rotation speed during dehydration was determined to be 1250rpm.

As described above, in consideration of the deformation strength of the dewatering tub 2, the maximum rotation speed determining section 63a determines the maximum rotation speed during dewatering to be a large rotation speed in the case where the force acts in the direction in which the dewatering tub 2 is difficult to deform into an elliptical shape, as compared with the case where the force acts in the reverse direction in which the dewatering tub 2 is easy to deform into an elliptical shape.

Thus, in the present embodiment, when the adjustment water is injected into one baffle plate 8, the highest rotation speed during the dehydration is determined using a different correspondence table between the case of injecting water into the baffle plate a and the case of injecting water into the baffle plate B or the case of injecting water into the baffle plate C.

As described above, in the washing machine 1 of the present embodiment, when the deformation strength of the dewatering tub 2 is not uniform in the circumferential direction, the maximum rotation speed determining unit 63a determines the maximum rotation speed during the dewatering process based on the relationship between the position of the water-filled baffle plate 8 and the deformation strength of the dewatering tub 2.

When such a structure is adopted, an appropriate dehydration rotation speed can be selected by taking into consideration the deformation strength of the dehydration tub 2.

The embodiments of the present invention have been described above, but the configuration of the present embodiment is not limited to the above-described embodiments, and various modifications are possible.

For example, in the first embodiment, in the case where the adjustment water is injected into one baffle plate 8, the maximum rotation speed determination unit 63a determines the maximum rotation speed during the dehydration process in consideration of the injection amount of the water injected into the baffle plate 8, the distribution of the baffle plates 8 injected with water, and the amplitude of the outer tub 3 (dehydration tub 2), but is not limited thereto.

In the case where the adjustment water is injected into the two baffles 8, the maximum rotation speed determining unit 63a determines the maximum rotation speed during the dehydration process in consideration of the injection amount of the water injected into the baffles 8, the distribution of the baffles 8 to be injected, the water injection difference between the baffles, and the amplitude of the outer tub 3 (dehydration tub 2), but is not limited thereto.

For example, the maximum rotation speed determination unit 63a may determine the maximum rotation speed during dehydration in consideration of at least one of the water injection amount of water injected into the baffle 8, the distribution of the baffle 8 injected with water, and the amplitude of the outer tub 3 (dehydration tub 2).

In the second embodiment, the maximum rotation speed determination unit 63a determines the maximum rotation speed during dehydration in consideration of the amount of water injected into the baffle plate 8, the distribution of the baffle plate 8 to be injected, the amplitude of the outer tub 3 (the dehydration tub 2), and the deformation strength of the dehydration tub 2, but is not limited thereto.

For example, the maximum rotation speed determination unit 63a may determine the maximum rotation speed during the dehydration using at least one of the water injection amount of water injected into the baffle 8, the distribution of the baffle 8 to be injected, the amplitude of the outer tub 3 (the dehydration tub 2), and the deformation strength of the dehydration tub 2.

In the second embodiment, regarding the case where the adjustment water is injected into one baffle plate 8, the maximum rotation speed determination unit 63a determines the maximum rotation speed during dehydration using different correspondence tables in the case where the adjustment water is injected into the baffle plate a, the case where the adjustment water is injected into the baffle plate B, and the case where the adjustment water is injected into the baffle plate C, and the same applies to the case where the adjustment water is injected into both baffle plates 8. That is, regarding the case where the adjustment water is injected into the two baffles 8, the maximum rotation speed determination unit 63a may determine the maximum rotation speed during the dehydration using different correspondence tables in the case where the water is injected into the baffle A, B, the case where the water is injected into the baffle A, C, and the case where the water is injected into the baffle B, C.

In the first to second embodiments described above, the three baffles 8 are provided and the water receiving ring unit 5 having the three water guide grooves 5a, 5b, 5c for injecting water into the three baffles 8 is provided, but the present invention is not limited thereto, and any configuration may be adopted as long as three or more baffles 8 are provided and a water injection device capable of independently injecting adjustment water into each baffle 8 is provided.

In the first to second embodiments described above, the inner peripheral side wall of the baffle plate 8 has the protruding wall portion 82 protruding radially inward, and the radially inner end portion of the water receiving plate 85 is disposed inside the protruding wall portion 82, but is not limited thereto. For example, the inner peripheral side wall of the baffle plate 8 may not have the protruding wall portion 82 protruding radially inward.

In the first to second embodiments, examples of the shape of the baffle plate 8 are shown, but the present invention is not limited thereto. The shape of the baffle plate 8, the shape of the water storage space 8Ta, and the shape of the drainage space 8Tb are arbitrary, and may be, for example, a shape expanding upward or downward.

In the first to second embodiments described above, examples of the shape of the water receiving plate 85 are shown, but not limited thereto. The position (height in the up-down direction) and the radial length of the water receiving plate 85 are arbitrary.

In the first to second embodiments described above, the acceleration of the dewatering tub 2 is set to be substantially the same as the acceleration of the outer tub 3 detected by the acceleration sensor 56, but the acceleration sensor may be disposed in the dewatering tub 2 and the acceleration of the dewatering tub 2 may be detected by the acceleration sensor.

Other structures can be variously modified within a range not departing from the technical spirit of the present invention.

Claims

1. A washing machine is characterized by comprising:

a dewatering barrel, the bottom of which is provided with a pulsator;

three or more baffles arranged at equal intervals in the circumferential direction on the inner circumferential surface of the dewatering barrel;

the water injection device can independently inject adjusting water into each baffle plate;

an acceleration detection unit detecting vibration of the dehydration tub;

a dehydration barrel position detecting device which transmits a pulse signal corresponding to the rotation of the dehydration barrel;

an eccentric detection unit for detecting the eccentric amount and the eccentric position in the dewatering barrel;

a water injection control unit for controlling the water injection device to inject water to the baffle plate corresponding to the eccentric position when the eccentric amount reaches a specified eccentric amount threshold value for water injection in the dehydration process;

a maximum rotation speed determination unit that determines a maximum rotation speed during dehydration based on water injection states to the three or more baffles; and

and a motor control unit for controlling a motor for rotationally driving the dewatering drum during dewatering.

2. A washing machine as claimed in claim 1, characterized in that,

the maximum rotation speed determination unit determines the maximum rotation speed during dehydration based on the water injection amount of water injected into the baffle plate.

3. A washing machine as claimed in claim 1 or 2, characterized in that,

the maximum rotation speed determination unit determines the maximum rotation speed during dehydration based on the distribution of the baffles injected with water.

4. A washing machine as claimed in claim 1 or 2, characterized in that,

has an outer tub in which the dewatering tub is disposed,

the maximum rotation speed determining unit determines the maximum rotation speed during dehydration based on the amplitude of the tub.

5. A washing machine as claimed in claim 1 or 2, characterized in that,

in the case where the deformation strength of the dewatering tub is not uniform in the circumferential direction, the maximum rotation speed determining unit determines the maximum rotation speed during dewatering based on the relationship between the position of the baffle plate to which water is injected and the deformation strength of the dewatering tub.