JP7503266B2 - washing machine - Google Patents

Description

The present invention relates to a washing machine that can eliminate imbalance in the spin tub while continuing to rotate the spin tub, thereby suppressing vibrations and noise caused by eccentricity of the spin tub during spin drying.

A typical washing machine installed in a normal home or laundromat has a spin tub with many water holes formed on its inner surface. Therefore, the water removed from the laundry in the spin tub during spin-drying is drained to the outside of the spin tub through the many water holes. Also, if the laundry is significantly unevenly distributed during spin-drying, the spin tub becomes more eccentric during rotation, requiring a large torque to rotate, and the spin-drying operation cannot be started.

Patent Document 1 discloses a technology that detects the amount and location of imbalance of clothes in the washing tub during spin-drying, and if there is imbalance, actively resolves the imbalance in the spin-drying tub by injecting water into multiple baffles that are evenly spaced around the periphery of the tub.

JP 2017-56025 A

In the washing machine of Patent Document 1, in order to eliminate the imbalance in the spin tub, an amount of adjustment water corresponding to the amount of imbalance is poured into the baffle on the opposite side of the imbalance in the clothes in the washing tub. Therefore, when the spin tub is rotated after the adjustment water is poured, the uneven distribution of clothes and the adjustment water poured into the baffle pull on the spin tub due to the centrifugal force during spinning, causing the spin tub to deform into an oval shape. If the spin tub becomes oval, noise will be generated due to contact between the outer tub and the spin tub, and the spin tub will undergo plastic deformation, making it difficult to improve the spin rate by rotating the spin tub at high speed.

Therefore, the present invention provides a washing machine that can improve the spin-drying rate by rotating the spin-drying tub at high speed during spin-drying.

The washing machine of the present invention is characterized in that it comprises a spin tub with a pulsator arranged at the bottom, three or more baffles arranged at equal intervals circumferentially around the inner surface of the spin tub, a water injection device capable of injecting conditioned water into each baffle individually, an acceleration detection means for detecting vibrations of the spin tub, a spin tub position detection device for transmitting a pulse signal in response to the rotation of the spin tub, eccentricity detection means for detecting the amount of eccentricity and the eccentricity position within the spin tub, a water injection control means for controlling the water injection device to inject water into the baffle corresponding to the eccentricity position when the amount of eccentricity reaches a predetermined eccentricity amount threshold for water injection during the spin water process, a maximum rotation speed determination means for determining the maximum rotation speed at which the imbalance of the spin tub is eliminated during the spin water process based on the water injection state of the three or more baffles, and a motor control means for controlling a motor that rotates and drives the spin water tub during the spin water process.

In the washing machine according to the present invention, it is preferable that the maximum rotation speed determining means determines the maximum rotation speed in the spin-drying process based on the amount of water poured into the baffle.

In the washing machine according to the present invention, it is preferable that the maximum rotation speed determining means determines the maximum rotation speed in the spin-drying process based on the distribution of water poured into the baffle.

In the washing machine according to the present invention, it is preferable that the spin tub has an outer tub disposed therein, and the maximum rotation speed determination means determines the maximum rotation speed in the spin cycle based on the amplitude of the outer tub.

In the washing machine according to the present invention, when the deformation strength of the dewatering tub is not uniform in the circumferential direction,
It is preferable that the maximum rotation speed determining means determines the maximum rotation speed in the spin-drying step based on the relationship between the position of the baffle where water is poured and the deformation strength of the spin-drying tub.

According to the present invention, in the spin cycle, conditioning water is injected into the baffle to eliminate the imbalance in the spin cycle tank, and the maximum rotation speed in the spin cycle after the conditioning water is injected is determined based on the water injection state of the baffle. This makes it possible to maximize the maximum rotation speed in the spin cycle while preventing the spin cycle tank from deforming into an oval shape.

According to the present invention, the deformation of the dehydration tub into an oval shape can be suppressed by taking into consideration the magnitude of the force that pulls the dehydration tub due to the centrifugal force generated by the clothes imbalance and the conditioned water poured into the baffle during dehydration. This prevents contact between the outer tub and the dehydration tub and plastic deformation of the dehydration tub, while improving the dehydration rate through high-speed spin rotation.

According to the present invention, faster dehydration is possible by taking into account the distribution of water injected into the baffles.

According to the present invention, by taking into account the amplitude of the outer tank, it is possible to achieve high-speed dehydration while suppressing noise generation.

According to the present invention, an appropriate spin rotation speed can be selected by taking into account the deformation strength of the spin tank.

1 is a perspective view showing the appearance of a washing machine 1 according to a first embodiment of the present invention; FIG. 2 is a schematic diagram showing the configuration of the washing machine 1 of FIG. FIG. 2 is a plan view of a portion of the washing machine 1 of FIG. 1 viewed from above. 2 is a cross-sectional view of a spin-drying tub 2 of the washing machine 1 of FIG. 1. 5(a) is a diagram of baffle 8 formed on inner circumferential surface 2a1 of spin tub 2 as viewed from the inner circumferential side, and FIG. 5(b) is a cross-sectional view taken along line _a1 - _a1 in FIG. 5(a). FIG. 2 is a block diagram of an electrical system of the washing machine 1 of FIG. 11A to 11C are diagrams illustrating the manner in which the dehydration tub 2 is deformed. 11A to 11C are diagrams illustrating the manner in which the dehydration tub 2 is deformed. 13 shows a correspondence table used by maximum rotation speed determination unit 63a when determining the maximum rotation speed in the spin-drying process. 2 is a flowchart showing a control flow in a spin-drying process of the washing machine 1 of FIG. 1 . 11 is a flowchart showing the control of the first baffle water injection process of FIG. 10 . 11 is a flowchart showing the control of the second baffle water injection process of FIG. 10 . FIG. 13(a) is a diagram illustrating a manufacturing method of the spin-drying tub 2 of the washing machine according to the second embodiment of the present invention, and FIG. 13(b) and FIG. 13(c) are diagrams illustrating the form in which the spin-drying tub 2 is deformed. FIG. 14(a) is a schematic diagram of the spin tub 2 of a washing machine according to a second embodiment of the present invention, and FIG. 14(b) is a correspondence table used by the maximum rotation speed determination unit 63a when determining the maximum rotation speed in the spin water process.

The washing machine 1 according to an embodiment of the present invention will be described in detail below with reference to the drawings.

First Embodiment
Fig. 1 is a perspective view showing the 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 configuration of washing machine 1 of this embodiment. Fig. 3 is a plan view of a part of washing machine 1 of this embodiment seen from above. Fig. 4 is a cross-sectional view of a spin tub 2 of washing machine 1.

The washing machine 1 of this embodiment includes a washing machine main body 1a, a spin tub 2, an outer tub 3, a water receiving ring unit 5, a water injection device 30 (nozzle unit), a drive unit 50, and a control means 60 (see FIG. 6).

The washing machine body 1a shown in FIG. 1 has a generally rectangular parallelepiped shape. An opening 11 for loading and unloading laundry from the spin tub 2 is formed on the top surface of the washing machine body 1a, and an opening/closing lid 11a that can open and close this opening 11 is attached.

The outer tub 3 is a cylindrical member with a bottom that is disposed inside the washing machine body 1a and is capable of storing wash water inside. A drain outlet 10 is formed in the bottom surface of the outer tub 3, and a drain pipe 10a is connected to the drain outlet 10. As shown in FIG. 2, an acceleration sensor 56 capable of detecting acceleration in two directions, horizontal and vertical, is attached to the upper end of the outer peripheral surface 3a of the outer tub 3. In this embodiment, the acceleration of the outer tub 3 is detected by the acceleration sensor 56, and the acceleration of the spin tub 2 is assumed to be approximately the same as the acceleration of the outer tub 3.

The spin tub 2 is a cylindrical member with a bottom that is arranged coaxially with the outer tub 3 and is supported so as to be freely rotatable within the outer tub 3. The spin tub 2 can accommodate laundry inside, and has a number of water holes 2t (see FIG. 5(a)) in its wall surface 2a.

A pulsator (agitating blade) 4 is rotatably disposed in the center of the bottom 2c of the spin tub 2. As shown in FIG. 2, the pulsator 4 has a generally disk-shaped pulsator body 4a, a number of upper blades 4b formed on the upper surface of the pulsator body 4a, and a number of lower blades 4c formed on the lower surface of the pulsator body 4a. The pulsator 4 agitates the wash water stored in the outer tub 3 to generate a water current.

As shown in FIG. 4, three baffles (water injection pipes) 8 serving as water passage pipes are provided on the inner peripheral surface 2a1 of the dehydration tub 2 at equal intervals (equal angles) in the circumferential direction. Each baffle 8 extends vertically from the bottom 2c to the upper end of the dehydration tub 2, and is formed to protrude from the inner peripheral surface 2a1 of the dehydration tub 2 toward the axis S1. Each baffle 8 is hollow and has an arc-shaped cross section. In this way, the shape of the baffle 8 protrudes little toward the axis S1 of the dehydration tub 2 and expands circumferentially of the dehydration tub 2, which prevents the storage space of the dehydration tub 2 from becoming narrow.

As shown in FIG. 2, the upper end of the baffle 8 is provided with a horizontally long circulating water port 80. The lower end of the baffle 8 is provided with an opening 81 that opens near the bottom 2c of the spin tub 2, more specifically, below the pulsator body 4a.

Therefore, in the washing process in which the drain valve _10a1 (see FIG. 2) is closed and wash water is stored in the outer tub 3, the wash water agitated by the lower blade portion 4c of the pulsator 4 enters through the opening 81, runs up inside the baffle 8, and is discharged from the circulating water port 80, shower-washing the clothes, as shown by the arrows in FIG. 2. This operation is repeated, so that the wash water circulates inside the spin tub 2. In other words, the baffle 8 has a function of circulating the wash water.

A partition piece 8a is provided near the upper end of the baffle 8, extending from the circulating water port 80 to a position close to the inner circumferential surface 2a1 of the dehydration tank 2. The partition piece 8a extends radially outward from the upper edge of the circulating water port 80 and then curves downward. A gap 8b (see Figure 2) is formed between the partition piece 8a and the inner circumferential surface 2a1 of the dehydration tank 2, and the conditioned water supplied from the water receiving ring unit 5 flows downward through the gap 8b.

As shown in FIG. 3, the water receiving ring unit 5 is composed of three layers of annular water guide gutters 5a, 5b, and 5c that are open upward and stacked radially toward the axis S1 of the dehydration tank 2, and is fixed to the upper end of the inner circumferential surface 2a1 of the dehydration tank 2 as shown in FIG. 2. The water guide gutters 5a, 5b, and 5c are provided in the same number as the baffles 8, and are formed so that the conditioned water can flow to any one of the baffles 8 individually.

As shown in FIG. 3, the lower end of the water guide gutter 5a has an opening 5A that opens radially outward, and the water guide gutter 5a communicates with the inside of the baffle 8. The lower end of the water guide gutter 5b has an opening 5B that opens radially outward, and the water guide gutter 5b communicates with the inside of the baffle 8 via a water passage 5Ba that passes under the water guide gutter 5a. The lower end of the water guide gutter 5c has an opening 5C that opens radially outward, and the water guide gutter 5c communicates with the inside of the baffle 8 via a water passage 5Ca that passes under the water guide gutter 5a and the water guide gutter 5b.

An annular fluid balancer 12 is attached to the outer periphery of the water receiving ring unit 5. The fluid balancer 12 is similar to known fluid balancers.

The water injection device 30 injects the adjustment water into each of the water guide pipes 5a, 5b, and 5c. The water injection device 30 has three water injection nozzles 30a, 30b, and 30c arranged above the water guide pipes 5a, 5b, and 5c, and water supply valves 31a, 31b, and 31c connected to the water injection nozzles 30a, 30b, and 30c, respectively. The water injection nozzles 30a, 30b, and 30c are provided in the same number as the water guide pipes 5a, 5b, and 5c, and are attached to the upper end of the outer tank 3 at positions where they can inject water into the separate water guide pipes 5a, 5b, and 5c. In this embodiment, tap water is used as the adjustment water. In addition, it is also possible to use a direction switching water supply valve as the water supply valve 31a, 31b, and 31c.

The drive unit 50 shown in FIG. 2 rotates the pulley 52 and belt 53 by the motor 51, and also rotates the drive shaft 54 extending toward the bottom 2c of the spin tub 2, thereby providing driving force to the spin tub 2 and the pulsator 4, causing them to rotate. The washing machine 1 mainly rotates only the pulsator 4 during the washing process, and rotates the spin tub 2 and the pulsator 4 integrally at high speed during the spin process. In addition, a proximity switch 55 is provided near one of the pulleys 53, which can detect the passage of the mark 52a formed on the pulley 52.

5(a) is a diagram of baffle 8 formed on inner circumferential surface 2a1 of spin tub 2 as viewed from the inner circumferential side, and FIG. 5(b) is a cross-sectional view taken along line _a1 - _a1 in FIG. 5(a).

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

The water receiving plate 85 is disposed at the same height as the protruding wall portion 82, and the radially inner end portion 85a of the water receiving plate 85 is disposed inside the protruding wall portion 82. A gap is formed between the radially inner end portion 85a of the water receiving plate 85 and the tip inner circumferential surface of the protruding wall portion 82, and the conditioned water supplied to the water storage space 8Ta flows into the drainage space 8Tb through the gap.

The internal space of the baffle 8 has a water storage space 8Ta located above the protruding wall portion 82 on which the water receiving plate 85 is located, and a drainage space 8Tb located below the protruding wall portion 82. The water storage space 8Ta is a space for storing the conditioned water from the water guide gutters 5a, 5b, and 5c, and the drainage space 8Tb is a space for draining the conditioned water that flows out from the water storage space 8Ta.

As shown in Figures 5(a) and 5(b), the radial thickness of the water storage space 8Ta and the radial thickness of the drainage space 8Tb are approximately the same, while the vertical length of the drainage space 8Tb is shorter than the vertical length of the water storage space 8Ta. The circumferential length of the water storage space 8Ta is formed to be longer than the circumferential length of the drainage space 8Tb. Therefore, the volume of the water storage space 8Ta is larger than the volume of the drainage space 8Tb.

The conditioning water poured into the water storage space 8Ta of the baffle 8 is held by the water receiving plate 85 arranged inside the protruding wall portion 82 so that it does not flow downward, and flows radially inward along the upper surface of the water receiving plate 85 inside the protruding wall portion 82. When the conditioning water is poured into the water storage space 8Ta of the baffle 8 while the dehydration tank 2 is rotating, the conditioning water sticks to the outer peripheral walls of the water guide gutters 5a, 5b, and 5c due to centrifugal force, so that the conditioning water is held in the water storage space 8Ta.

FIG. 6 is a block diagram showing the electrical configuration of the washing machine 1 of this embodiment. The operation of this washing machine 1 is controlled by a control means 60 including a microcomputer. The control means 60 includes a central control unit (CPU) 61 that controls the entire system, and is connected to a memory 62 that stores a low-speed rotation setting value (N1) during low-speed spin-drying operation, a high-speed rotation setting value (N2) during high-speed spin-drying operation, a first eccentricity threshold (eccentricity threshold) (ma ₁ ) during low-speed spin-drying operation, a second eccentricity threshold (eccentricity threshold) (ma ₂ ) during high-speed spin-drying operation, a first acceleration threshold (mc ₁ ) during low-speed spin-drying operation, and a second acceleration threshold (mc ₂ ) during high-speed spin-drying operation, which are necessary for rotation control of the spin-drying tub 2. In addition, the control means 60 causes the microcomputer to execute a program stored in the memory 62, thereby performing a predetermined operation, and the memory 62 temporarily stores data used when executing the program.

The central control unit 61 outputs a control signal to the rotation speed control unit 63, which in turn 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 controls the rotation of the motor 51 so that the maximum rotation speed in the spin-drying process becomes the maximum rotation speed determined by the maximum rotation speed determination unit 63a. The rotation speed control unit 63 receives a signal indicating the rotation speed of the motor 51 in real time from the motor control unit 64, and serves as a control element. The unbalance amount detection unit 65 is connected to the acceleration sensor 56, and the unbalance position detection unit 66 is connected to the acceleration sensor 56 and the proximity switch 55.

As a result, when the proximity switch 55 detects the marker 52a (see Figure 2), the unbalance amount detection unit 65 calculates the amount of unbalance (M) from the magnitude of the horizontal and vertical acceleration from the acceleration sensor 56, and outputs this amount of unbalance to the unbalance amount determination unit 67. The unbalance position detection unit 66 calculates the angle of the unbalance direction from the signal indicating the position of the marker 52a input from the proximity switch 55, and outputs an unbalance position signal to the water injection control unit 68.

When the water injection control unit 68 receives signals indicating the amount of imbalance and the position of the imbalance from the imbalance amount determination unit 67 and the imbalance position detection unit 66, it determines which baffle 8 in the spin tub 2 to supply water to and the amount of water to supply based on a control program stored in advance. It then opens the selected water supply valves 31a, 31b, and 31c to start injecting adjustment water. When an imbalance occurs in the spin tub 2, it starts injecting adjustment water into the water guide gutters 5a, 5b, and 5c of the water receiving ring unit 5 from the water injection nozzles 30a, 30b, and 30c selected based on the calculation of the amount of imbalance, and stops injecting adjustment water when the imbalance is eliminated by the baffle 8.

As shown in FIG. 4, for example, when the laundry clump D(X) causing the eccentricity is between baffles 8(B) and 8(C) of the spin tub 2, the water injection control unit 68 controls the water injection device 30 to supply adjustment water to baffle 8(A). When the laundry clump D(Y) is near baffle 8(A), the water injection control unit 68 controls the water injection device 30 to supply adjustment water to both baffles 8(B) and 8(C).

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

As explained in the problem of the prior art, when the dehydration tub 2 rotates after the balanced water is poured into the baffle 8 to eliminate the imbalance of the dehydration tub 2 during the spin-drying process, the eccentric load (unbalanced clothes) and the balanced water poured into the baffle 8 pull on the dehydration tub 2 due to the centrifugal force generated during spin-drying, causing the dehydration tub 2 to deform into an elliptical shape. When the dehydration tub 2 deforms into an elliptical shape, the gap between the outer tub 3 and the dehydration tub 2 becomes smaller, causing the outer tub 3 and the dehydration tub 2 to come into contact with each other, generating noise. There is also the problem of the dehydration tub 2 undergoing plastic deformation.

(Amount of water injected)
Figure 7(a) shows a state in which adjustment water is poured into one baffle 8 to eliminate a relatively large unbalance state in the dehydration tank 2 during the spin-drying process, and Figure 7(b) shows a state in which adjustment water is poured into one baffle 8 to eliminate a relatively small unbalance state in the dehydration tank 2 during the spin-drying process.

The greater the imbalance in the dehydration tank 2, the greater the amount of water that needs to be poured into the baffle 8 to eliminate the imbalance, and the smaller the imbalance in the dehydration tank 2, the less the amount of water that needs to be poured into the baffle 8 to eliminate the imbalance.

When eliminating a relatively large imbalance in the spin tub 2, as shown in Figure 7(a), the centrifugal force during spinning causes the eccentric load (uniform clothing) and the force of the adjusted water poured into the baffle 8 to act on parts of the spin tub 2 that are approximately 180° apart in the circumferential direction. However, because both the eccentric load and the amount of water poured into the baffle 8 are large, the two forces acting in opposite directions on the spin tub 2 are relatively large, and the spin tub 2 is prone to deforming into an oval shape.

In contrast, when eliminating a relatively small imbalance in the spin tub 2, as shown in FIG. 7(b), the centrifugal force during spinning causes the eccentric load (uniform clothing) and the force of the adjusted water poured into the baffle 8 to act on parts of the spin tub 2 that are approximately 180° apart in the circumferential direction. However, because both the eccentric load and the amount of water poured into the baffle 8 are small, the two forces acting in opposite directions on the spin tub 2 are relatively small, and the spin tub 2 is less likely to deform into an oval shape than when the two forces acting in opposite directions on the spin tub 2 are relatively large, as in FIG. 10(a).

The maximum rotation speed determination unit 63a therefore determines the maximum rotation speed in the spin-drying process to be a higher rotation speed because the smaller the amount of water poured into the baffle 8, the less likely the spin-drying tank 2 will deform into an oval shape, and the greater the amount of water poured into the baffle 8, the more likely the spin-drying tank 2 will deform into an oval shape, so it determines the maximum rotation speed in the spin-drying process to be a lower rotation speed.

(Distribution of water-injected baffles 8)
Figure 8(a) shows a state in which adjustment water is poured into one baffle 8 to eliminate the unbalanced state of the dehydration tank 2 during the spin-drying process, and Figure 8(b) shows a state in which adjustment water is poured into two baffles 8 to eliminate the unbalanced state of the dehydration tank 2 during the spin-drying process.

When conditioning water is poured into one baffle 8, as shown in Figure 8(a), the centrifugal force during spin-drying causes the eccentric load (uniformity of clothes) and the force of the conditioning water poured into the baffle 8 to act on parts of the spin-drying tub 2 that are approximately 180° apart in the circumferential direction. At this time, two forces act on the spin-drying tub 2 in opposite directions, so the spin-drying tub 2 is prone to deforming into an oval shape.

In contrast, when conditioning water is poured into the two baffles 8, as shown in FIG. 8(b), the centrifugal force during spin-drying causes the eccentric load (uniformity of clothes) and the force of the conditioning water poured into the baffles 8 to act on parts of the spin-drying tub 2 that are approximately 120° apart. At this time, three forces act on the spin-drying tub 2 approximately evenly spaced approximately 120° apart, so the spin-drying tub 2 is less likely to deform into an oval shape than when two forces acting in opposite directions act on the spin-drying tub 2 as shown in FIG. 8(a).

Therefore, when adjustment water is poured into two baffles 8, the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin-drying process to be a relatively high rotation speed because the spin-drying tank 2 is unlikely to deform into an oval shape, and when adjustment water is poured into one baffle 8, the spin-drying tank 2 is likely to deform into an oval shape, so the maximum rotation speed in the spin-drying process is determined to be a relatively low rotation speed.

(Regarding the amplitude of the outer tank 3)
The larger the amplitude of the outer tub 3, the smaller the gap between the washing machine main body 1a and the outer tub 3, making it easier for the washing machine main body 1a and the outer tub 3 to come into contact, and the smaller the gap between the outer tub 3 and the dehydration tub 2, making it easier for the outer tub 3 and the dehydration tub 2 to come into contact, generating noise.

Therefore, the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin-drying process to be a higher rotation speed when the amplitude of the outer tub 3 is smaller, and determines the maximum rotation speed in the spin-drying process to be a relatively smaller rotation speed when the amplitude of the outer tub 3 is smaller.

Figure 9 shows a correspondence table used by the maximum rotation speed determination unit 63a when determining the maximum rotation speed in the spin-drying process. Figure 9(a) is a correspondence table when adjustment water is poured into one baffle 8, and Figure 9(b) is a correspondence table when adjustment water is poured into two baffles 8.

As shown in FIG. 9(a), the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin-drying process to be 1200 rpm when the amount of water poured into baffle A is 300 g or less, the amount of water poured into baffles B and C is 0, and the amplitude of the outer tub 3 is 1 mm or less. On the other hand, when the amount of water poured into baffle A is 600 g or less, the amount of water poured into baffles B and C is 0, and the amplitude of the outer tub 3 is 1 mm or less, the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin-drying process to be 1100 rpm.

As described above, the maximum rotation speed determination unit 63a determines the maximum rotation speed in the dehydration process to be a smaller value the more water is poured into the baffle 8.

As shown in FIG. 9(a), the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin-drying process to be 1200 rpm when the amount of water poured into baffle A is 300 g or less, the amount of water poured into baffles B and C is 0, and the amplitude of the outer tub 3 is 1 mm or less. On the other hand, when the amount of water poured into baffle A is 300 g or less, the amount of water poured into baffles B and C is 0, and the amplitude of the outer tub 3 is 3 mm or less, the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin-drying process to be 1100 rpm.

As described above, the maximum rotation speed determination unit 63a determines the maximum rotation speed in the dehydration process to be a smaller value as the amplitude of the outer tub 3 increases.

Note that while Figure 9(a) shows a correspondence table for the case where water is poured into baffle A but not into baffles B and C, the correspondence tables are similar for the case where water is poured into baffle B but not into baffles A and C, and for the case where water is poured into baffle C but not into baffles A and B.

As shown in FIG. 9(b), the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin-drying process to be 1400 rpm if the amount of water poured into baffle A is 300 g or less, the amount of water poured into baffle B is 300 g or less, the amount of water poured into baffle C is 0, the water pouring difference between the baffles (the difference between the amount of water poured into baffle A and the amount of water poured into baffle B) is 50 g or less, and the amplitude of the outer tub 3 is 1 mm or less. On the other hand, if the amount of water poured into baffle A is 600 g or less, the amount of water poured into baffle B is 600 g or less, the amount of water poured into baffle C is 0, the water pouring difference between the baffles (the difference between the amount of water poured into baffle A and the amount of water poured into baffle B) is 50 g or less, and the amplitude of the outer tub 3 is 1 mm or less.

As described above, the maximum rotation speed determination unit 63a basically determines the maximum rotation speed in the spin process to be a lower rotation speed as the amount of water poured into the baffle 8 increases, but when adjustment water is poured into two baffles 8, the maximum rotation speed in the spin process is determined to be the same rotation speed even if the amount of water poured into the baffle 8 is different. In other words, when adjustment water is poured into two baffles 8, the spin tank 2 is less likely to deform into an oval shape, and whether or not the spin tank 2 deforms into an oval shape is largely influenced by the distribution of poured water into the baffles 8 and little by the amount of water poured into the baffles 8.

As shown in FIG. 9(b), the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin-drying process to be 1400 rpm if the amount of water poured into baffle A is 300 g or less, the amount of water poured into baffle B is 300 g or less, the amount of water poured into baffle C is 0, the water pouring difference between the baffles (the difference between the amount of water poured into baffle A and the amount of water poured into baffle B) is 50 g or less, and the amplitude of the outer tub 3 is 1 mm or less. On the other hand, if the amount of water poured into baffle A is 300 g or less, the amount of water poured into baffle B is 300 g or less, the amount of water poured into baffle C is 0, the water pouring difference between the baffles (the difference between the amount of water poured into baffle A and the amount of water poured into baffle B) is 50 g or less, and the amplitude of the outer tub 3 is 3 mm or less, the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin-drying process to be 1200 rpm.

As described above, the maximum rotation speed determination unit 63a determines the maximum rotation speed in the dehydration process to be a smaller value as the amplitude of the outer tub 3 increases.

Note that while Figure 9(b) shows a correspondence table for the case where water is poured into baffles A and B but not into baffle C, the same correspondence tables are used for the cases where water is poured into baffles A and C but not into baffle B, and where water is poured into baffles B and C but not into baffle A.

The maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin-drying process to be 1100 rpm when the amount of water poured into baffle A is 600 g or less, the amount of water poured into baffles B and C is 0, and the amplitude of the outer tub 3 is 1 mm or less, as shown in FIG. 9(a), whereas it determines the maximum rotation speed in the spin-drying process to be 1400 rpm when the amount of water poured into baffle A is 300 g or less, the amount of water poured into baffle B is 300 g or less, the amount of water poured into baffle C is 0, the water pouring difference between the baffles (the difference between the amount of water poured into baffle A and the amount of water poured into baffle B) is 50 g or less, and the amplitude of the outer tub 3 is 1 mm or less, as shown in FIG. 9(b).

As described above, when the amount of water poured into the baffles 8 is approximately the same, the maximum rotation speed determination unit 63a determines the maximum rotation speed in the dehydration process to be a relatively high rotation speed when adjustment water is poured into two baffles 8 compared to when adjustment water is poured into one baffle 8.

Figure 10 is a flow chart showing the control of the washing machine 1 in this embodiment. In this embodiment, when the central control unit 61 receives an input signal from a spin button (not shown) or a signal indicating that the spin cycle should be started during the operation of a washing course, it proceeds to step SP1 and starts the spin cycle.

<Step SP1>
In step SP1, the central control unit 61 loosens and inverts the spin tub 2, and then accelerates the rotation of the spin tub 2 based on the low-speed rotation setting value (N1).

<Step SP2>
In step SP2, the central control unit 61 detects the amount of imbalance (M) based on the acceleration value (x component of the acceleration sensor) provided by the acceleration sensor 56, compares the amount of imbalance (M) with the first eccentricity threshold (ma ₁ ) stored in the memory 62, and judges whether M<ma ₁ is satisfied. If it is judged that M<ma ₁ is satisfied, the process proceeds to step SP3. On the other hand, if it is judged that M<ma ₁ is not satisfied, the process proceeds to step SP4. Here, the first eccentricity threshold (ma ₁ ) is a threshold indicating that the laundry is so slightly unbalanced that no noise will be generated even if conditioning water is not supplied to the baffle 8. In other words, if it is judged that the unbalanced load is small or nonexistent and no noise will be generated even if water is not supplied to the baffle 8, the process proceeds to step SP3.

<Step SP3>
In step SP3, the central control unit 61 accelerates the rotation of the dehydration tub 2 based on the high speed rotation set value (N2).

<Step SP4>
In step SP4, the central control unit 61 performs a first baffle water injection process to eliminate the uneven distribution of the laundry. The procedure for the first baffle water injection process will be described later.

<Step SP5>
In step SP5, central control unit 61 determines whether the rotation speed of spin tub 2 has reached a predetermined rotation speed (e.g., 500 rpm). The predetermined rotation speed is the rotation speed at which almost all water is removed from the clothes, and varies depending on the diameter of spin tub 2. If central control unit 61 determines that the rotation speed of spin tub 2 has reached the predetermined rotation speed, it proceeds to step SP6. On the other hand, if central control unit 61 determines that the rotation speed of spin tub 2 has not reached the predetermined rotation speed, it returns to step SP2 and repeats steps SP2 to SP4.

<Step SP6>
In step SP6, the central control unit 61 detects the amount of imbalance (M) based on the acceleration value (x component of the acceleration sensor) given by the acceleration sensor 56, compares the amount of imbalance (M) with the second eccentricity threshold (ma ₂ ) stored in the memory 62, and judges whether M<ma ₂ is satisfied. If it is judged that M<ma ₂ is satisfied, the process proceeds to step SP7. On the other hand, if it is judged that M<ma ₂ is not satisfied, the process proceeds to step SP8. Here, the second eccentricity threshold (ma ₂ ) is a value smaller than the first eccentricity threshold (ma ₁ ), and is a threshold indicating that the laundry is so unbalanced that no noise is generated even if the conditioning water is not supplied to the baffle 8. In other words, if it is judged that the unbalanced load is small or does not exist and no noise is generated even if water is not supplied to the baffle 8, the process proceeds to step SP3.

<Step SP7>
In step SP7, the central control unit 61 accelerates the rotation of the dehydration tub 2 based on the high speed rotation set value (N2).

<Step SP8>
In step SP8, the central control unit 61 performs a second baffle water injection process to eliminate the uneven distribution of the laundry. The procedure for the second baffle water injection process will be described later.

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

<Step SP10>
In step SP10, the central control unit 61 acquires the distribution of the baffles 8 into which water has been poured in the spin tub 2. Thereafter, the process proceeds to step SP7.

<Step SP11>
In step SP11, the central control unit 61 determines the maximum rotation speed in the spin-drying process based on the amount of water poured into the baffles 8, the distribution of the water poured into the baffles 8, and the amplitude of the outer tub 3. The amount of water poured into the baffles 8 and the distribution of the water poured into the baffles 8 are the amount of water poured and distribution when the rotation speed of the spin-drying tub 2 is accelerated to the maximum rotation speed. The amplitude of the outer tub 3 is the amplitude when water pouring is completed when the rotation speed of the spin-drying tub 2 reaches a predetermined rotation speed (e.g., 500 rpm) and M< _ma2 is satisfied.

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

<Step SP12>
In step SP12, the central control unit 61 rotates the dehydration tub 2 at the maximum rotation speed for a predetermined time to perform the dehydration process, and then ends the dehydration process.

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

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

<Step SP102>
In step SP102, the central control unit 61 performs water injection processing into the baffle 8 facing the unbalanced position (N).

<Step SP103>
In step SP103, the central control unit 61 measures the water supply times ta, tb, and tc for which water was supplied to the three baffles 8, respectively.

<Step SP104>
In step SP104, the central control unit 61 detects the amount of imbalance (M) based on the acceleration value (x component of the acceleration sensor) provided by the acceleration sensor 56, compares the amount of imbalance (M) with the first acceleration threshold ( _mc1 ) stored in the memory 62, and judges whether or not M< _mc1 is satisfied. If it is judged that M< _mc1 is satisfied, the process proceeds to step SP105. On the other hand, if it is judged that M< _mc1 is not satisfied, the process returns to step SP102. Here, the first acceleration threshold ( _mc1 ) is a threshold indicating that the laundry is so unbalanced that no noise will be generated even if the injection of adjustment water into the baffle 8 is stopped. In other words, if the unbalanced load becomes small, the process proceeds to step SP105.

<Step SP105>
In step SP105, the central control unit 61 judges whether or not there is data on the water pouring times ta, tb, tc for which water was poured into the three baffles 8. If the central control unit 61 judges that there is data on the water pouring times ta, tb, tc for which water was poured into the three baffles 8, it proceeds to step SP106. On the other hand, if the central control unit 61 judges that there is no data on the water pouring times ta, tb, tc for which water was poured into the three baffles 8, it proceeds to step SP107.

<Step SP106>
In step SP106, the central control unit 61 adds the water supply times ta, tb, and tc during which water has been supplied to the three baffles 8 to the water supply times ta, tb, and tc up to now.

<Step SP107>
In step SP107, the central control unit 61 sets the water injection times for which water was injected into the three baffles 8 as ta, tb, and tc, and ends the process.

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

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

<Step SP202>
In step SP202, the central control unit 61 performs water injection processing into the baffle 8 facing the unbalanced position (N).

<Step SP203>
In step SP203, the central control unit 61 measures the water supply times ta, tb, and tc for which water was supplied to the three baffles 8, respectively.

<Step SP204>
In step SP204, the central control unit 61 detects the amount of imbalance (M) based on the acceleration value (x component of the acceleration sensor) given by the acceleration sensor 56, compares the amount of imbalance (M) with the second acceleration threshold ( _mc2 ) stored in the memory 62, and judges whether or not M< _mc2 is satisfied. If it is judged that M< _mc2 is satisfied, the process proceeds to step SP205. On the other hand, if it is judged that M< _mc2 is not satisfied, the process returns to step SP202. Here, the second acceleration threshold ( _mc2 ) is a value smaller than the first acceleration threshold ( _mc1 ), and is a threshold indicating that the imbalance of the laundry is small enough that no noise is generated even if the injection of the adjustment water into the baffle 8 is stopped. In other words, if the unbalanced load becomes small, the process proceeds to step SP205.

<Step SP205>
In step SP205, the central control unit 61 judges whether or not there is data on the water pouring times ta, tb, tc for which water was poured into the three baffles 8. If the central control unit 61 judges that there is data on the water pouring times ta, tb, tc for which water was poured into the three baffles 8, it proceeds to step SP206. On the other hand, if the central control unit 61 judges that there is no data on the water pouring times ta, tb, tc for which water was poured into the three baffles 8, it proceeds to step SP207.

<Step SP206>
In step SP206, the central control unit 61 adds the water supply times ta, tb, and tc during which water has been supplied to the three baffles 8 to the water supply times ta, tb, and tc up to now.

<Step SP207>
In step SP207, the central control unit 61 sets the water injection times for which water was injected into the three baffles 8 as ta, tb, and tc, and ends the process.

Thus, the washing machine 1 of this embodiment includes a spin tub 2 with a pulsator 4 disposed at the bottom 2c, three or more baffles 8 disposed at equal intervals in the circumferential direction on the inner circumferential surface 2a1 of the spin tub 2, a water injection device 30 capable of injecting conditioned water into each baffle 8 individually, an acceleration sensor 56 as an acceleration detection means for detecting vibrations of the spin tub 2, a proximity switch 55 as a spin tub position detection device that transmits a pulse signal in response to the rotation of the spin tub 2, and an imbalance amount detection unit as an eccentricity detection means for detecting the amount of eccentricity and the eccentricity position within the spin tub 2. 65 and an unbalanced position detection unit 66, a water injection control unit 68 as a water injection control means that controls the water injection device 30 to inject water into the baffle 8 corresponding to the eccentric position when the eccentricity amount reaches a predetermined water injection eccentricity amount threshold during the spin-drying process, a maximum rotation speed determination unit 63a as a maximum rotation speed determination means that determines the maximum rotation speed during the spin-drying process based on the water injection state of three or more baffles 8, and a motor control unit 64 as a motor control means that controls the motor 51 that rotates and drives the spin-drying tub 2 during the spin-drying process.

In this configuration, adjusting water is injected into the baffle 8 to eliminate the imbalance in the dehydration tank 2 during the dehydration process, and the maximum rotation speed during the dehydration process is determined based on the water injection state of the baffle 8. This makes it possible to maximize the maximum rotation speed during the dehydration process while preventing the dehydration tank 2 from deforming into an oval shape.

In the washing machine 1 of this embodiment, the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin cycle based on the amount of water poured into the baffle 8.

With this configuration, the dehydration tub 2 can be prevented from deforming into an oval shape by taking into consideration the forces that pull the dehydration tub 2 due to the centrifugal force generated by the clothes imbalance and the conditioned water poured into the baffle 8 during dehydration. This prevents contact between the outer tub 3 and the dehydration tub 2 and plastic deformation of the dehydration tub 2, while improving the dehydration rate through high-speed dehydration rotation.

In the washing machine 1 of this embodiment, the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin cycle based on the distribution of water poured into the baffle 8.

With this configuration, faster dehydration is possible by taking into account the distribution of water injected into the baffles 8.

In this embodiment of the washing machine 1, the spin tub 2 has an outer tub 3 disposed inside, and the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin cycle based on the amplitude of the outer tub 3.

With this configuration, by taking into account the amplitude of the outer tank 3, it is possible to achieve high-speed dehydration while suppressing noise generation.

Second Embodiment
The washing machine according to this embodiment differs from the washing machine according to the first embodiment in that the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin-drying process in consideration of the deformation strength of the spin-drying tub 2. In the configuration of the washing machine according to this embodiment, detailed description of the parts that are similar to those of the washing machine according to the first embodiment will be omitted.

In the vertical washing machine according to this embodiment, the cylindrical portion of the dehydration tub 2 is formed by forming a metal plate-like member into a cylindrical shape and connecting both ends of the plate-like member by, for example, welding, as shown in FIG. 13(a). The strength of the dehydration tub 2 is greater in the circumferential direction at the connection portions, so the deformation strength of the dehydration tub 2 is not uniform in the circumferential direction.

Let us consider a case where, after water is poured into the baffle 8, the eccentric load (uniformity of clothes) and the adjusted water poured into the baffle 8 act together to pull on the spin tub 2 due to the centrifugal force during spin drying.

As shown in Figure 13 (b), when forces act in opposite directions on part _T1 , which is not a connection part of the dehydration tub 2, and part _T2 opposite part _T1 , the deformation strength of the dehydration tub 2 is relatively small, so the dehydration tub 2 is likely to deform into an elliptical shape.

In contrast, as shown in Figure 13 (c), when forces act in opposite directions on part _T3 , which is the connection part of the dehydration tub 2, and part _T4 opposite part _T3 , the deformation strength of the dehydration tub 2 is relatively large, so that the dehydration tub 2 is unlikely to deform into an elliptical shape.

In the washing machine of this embodiment, as shown in FIG. 14(a), baffle 8(A) is placed at the connection part of the spin tub 2, and baffle 8(B) and baffle 8(C) are placed at the part of the spin tub 2 that is not the connection part.

In the first embodiment, when conditioning water is poured into one baffle 8, the maximum rotation speed in the dehydration process is determined to be approximately the same when water is poured into baffle 8 (A), when water is poured into baffle 8 (B), and when water is poured into baffle 8 (C).

In contrast, in this embodiment, the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin-drying process based on the relationship between the position of the baffle 8 into which water is poured and the deformation strength of the spin-drying tank 2.

In other words, if the eccentric load and the adjusted water poured into the baffle 8 have the same magnitude of force pulling the dehydration tank 2 due to the centrifugal force during dehydration, when water is poured into the baffle 8 (A) located at the connection part of the dehydration tank 2, the dehydration tank 2 is less likely to deform into an oval shape, so the maximum rotation speed in the dehydration process is determined to be higher than when water is poured into the baffle 8 (B) or baffle 8 (C) located at a position different from the connection part of the dehydration tank 2.

Figure 14 (b) shows a correspondence table that the maximum rotation speed determination unit 63a uses to determine the maximum rotation speed in the spin-drying process, and shows a portion of the correspondence table when conditioning water is poured into one baffle 8.

As shown in FIG. 14(b), the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin-drying process to be 1200 rpm if the amount of water poured into baffle B is 300 g or less, the amount of water poured into baffles A and C is 0, and the amplitude of the outer tub 3 is 1 mm or less. Similarly, if the amount of water poured into baffle C is 300 g or less, the amount of water poured into baffles A and B is 0, and the amplitude of the outer tub 3 is 1 mm or less, the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin-drying process to be 1200 rpm.

In contrast, if the amount of water poured into baffle A is 300 g or less, the amount of water poured into baffles B and C is 0, and the amplitude of outer tub 3 is 1 mm or less, the maximum rotation speed in the dehydration process is determined to be 1250 rpm.

As described above, the maximum rotation speed determination unit 63a takes into consideration the deformation strength of the dehydration tank 2 and determines the maximum rotation speed in the dehydration process to be higher when a force acts in a direction that makes it difficult for the dehydration tank 2 to deform into an oval shape than when a force acts in a direction that makes it easier for the dehydration tank 2 to deform into an oval shape.

Therefore, in this embodiment, when adjustment water is poured into one baffle 8, different correspondence tables are used to determine the maximum rotation speed in the spin-drying process depending on whether the adjustment water is poured into baffle A, baffle B, or baffle C.

In this manner, in the washing machine 1 of this embodiment, when the deformation strength of the spin tub 2 is not uniform in the circumferential direction, the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin cycle based on the relationship between the position of the baffle 8 into which water is poured and the deformation strength of the spin tub 2.

With this configuration, an appropriate spin rotation speed can be selected by taking into account the deformation strength of the spin tub 2.

The above describes an embodiment of the present invention, but the configuration of this embodiment is not limited to the above, and various modifications are possible.

For example, in the first embodiment, when conditioning water is poured into one baffle 8, the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin-drying process by taking into consideration the amount of water poured into the baffle 8, the distribution of the poured baffles 8, and the amplitude of the outer tub 3 (spin-drying tub 2), but this is not limited to the above.

In addition, when adjustment water is poured into two baffles 8, the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin-drying process by taking into consideration the amount of water poured into the baffles 8, the distribution of the baffles 8 to which water is poured, the difference in water poured between the baffles, and the amplitude of the outer tub 3 (spin-drying tub 2), but this is not limited to the above.

For example, the maximum rotation speed determination unit 63a may determine the maximum rotation speed in the spin-drying process by taking into consideration at least one of the amount of water poured into the baffle 8, the distribution of the water poured into the baffle 8, and the amplitude of the outer tub 3 (spin-drying tub 2).

In the second embodiment described above, the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin-drying process taking into consideration the amount of water poured into the baffle 8, the distribution of the water poured into the baffle 8, the amplitude of the outer tub 3 (spin-drying tub 2), and the deformation strength of the spin-drying tub 2, but is not limited to this.

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

In the second embodiment described above, when adjustment water is poured into one baffle 8, the maximum rotation speed determination unit 63a determines the maximum rotation speed in the spin-drying process using different correspondence tables for when adjustment water is poured into baffle A, when water is poured into baffle B, and when water is poured into baffle C. The same applies when adjustment water is poured into two baffles 8. That is, when adjustment water is poured into two baffles 8, the maximum rotation speed determination unit 63a may determine the maximum rotation speed in the spin-drying process using different correspondence tables for when adjustment water is poured into baffles A and B, when water is poured into baffles A and C, and when water is poured into baffles B and C.

In the first and second embodiments described above, three baffles 8 are provided, and a water receiving ring unit 5 having three water guide gutters 5a, 5b, and 5c for injecting water into the three baffles 8 is provided, but this is not limited thereto, and any configuration may be used in which three or more baffles 8 are provided and a water injection device is provided that can inject conditioned water into each baffle 8 individually.

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

In the first and second embodiments described above, examples of the shape of the baffle 8 are shown, but the shape is not limited to these. The shape of the baffle 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 that widens upward or downward.

In the first and second embodiments described above, examples of the shape of the water receiving plate 85 are shown, but the shape is not limited to these. The position (vertical height) and radial length of the water receiving plate 85 are arbitrary.

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

Other configurations can also be modified in various ways without departing from the spirit of the present invention.

1 Washing machine 2 Dehydration tub 2c Bottom of dehydration tub 3 Outer tub 4 Pulsator 8 Baffle 30 Water injection device 55 Proximity switch (dehydration tub position detection device)
56 Acceleration sensor (acceleration detection means)
63a Maximum rotation speed determination unit (maximum rotation speed determination means)
64 Motor control unit (motor control means)
65 Unbalance amount detection unit (eccentricity detection means)
66 Unbalanced position detector (eccentricity detector)
68 Water injection control unit (water injection control means)

Claims (5)

A dehydration tub having a pulsator disposed at the bottom thereof;
Three or more baffles are disposed at equal intervals in a circumferential direction on an inner peripheral surface of the dehydration tub;
A water injection device capable of injecting adjusted water into each baffle individually;
an acceleration detection means for detecting vibration of the dehydration tub;
a dehydration tub position detection device that transmits a pulse signal in response to rotation of the dehydration tub;
an eccentricity detection means for detecting an amount and position of eccentricity in the dehydration tub;
a water injection control means for controlling the water injection device so as to inject water into the baffle corresponding to the eccentricity position when the eccentricity amount reaches a predetermined water injection eccentricity amount threshold value during the dewatering process;
a maximum rotation speed determining means for determining a maximum rotation speed at which the imbalance in the dehydration tub is eliminated during the dehydration process based on a water injection state of the three or more baffles;
A washing machine comprising: a motor control means for controlling a motor that rotates the dehydration tub in a dehydration process. The washing machine according to claim 1, characterized in that the maximum rotation speed determining means determines the maximum rotation speed during the spin-drying process based on the amount of water poured into the baffle. The washing machine according to claim 1 or 2, characterized in that the maximum rotation speed determining means determines the maximum rotation speed in the spin-drying process based on the distribution of water poured into the baffle. The dehydration tub has an outer tub disposed therein,
4. The washing machine according to claim 1, wherein the maximum rotation speed determining means determines the maximum rotation speed in the spin-drying process based on the amplitude of the outer tub. When the deformation strength of the dewatering tub is not uniform in the circumferential direction,
The washing machine according to any one of claims 1 to 4, characterized in that the maximum rotation speed determination means determines the maximum rotation speed in the spin-drying process based on a relationship between a position of the baffle where water is poured and a deformation strength of the spin-drying tub.

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