JP2021074105A - Washing machine - Google Patents

Abstract

To prevent adjustment water from a nozzle unit from being poured to a wrong water transmission gutter.SOLUTION: A washing machine 1 comprises a dewatering tub 2 arranged in an outer tub 3, a water receiving ring unit 5 in which three annular water transmission gutters 5a, 5b, 5c respectively connected to an upper end part of a baffle 8 are mutually layered in a radial direction, a nozzle unit 30 capable of individually pouring adjustment water to each of the water transmission gutters 5a, 5b, 5c, an acceleration sensor 56 for detecting vibration of the outer tub 3, a proximity switch 55 that is a position detector of the dewatering tub 2, eccentricity detection means for detecting an eccentricity amount and an eccentric position in the dewatering tub 2, and control means for controlling the nozzle unit 30 to pour water to the baffle 8 corresponding to the eccentric position when the eccentricity amount reaches a prescribed threshold value of the eccentricity amount in a dewatering step. The control means perform different controls with respect to the nozzle unit 30 depending on whether the eccentric position detected by the eccentricity detection means is at an upper part or in a center part in a height direction of the dewatering tub 2 or the same is at a lower part of the dewatering tub 2.SELECTED DRAWING: Figure 2

Description

The present invention relates to a washing machine capable of eliminating the imbalance of the dehydration tub while continuing the rotation of the dehydration tub and suppressing vibration and noise due to eccentricity of the laundry during dehydration.

In a general washing machine installed in a general household or a coin laundry, the laundry is unevenly distributed in the dehydration tub during dehydration, and vibration and noise are generated. Further, if the bias of the laundry at that time is large, the amplitude of the dehydration tub during rotation becomes large and the vibration becomes large, so that the dehydration operation cannot be started.

Therefore, in Patent Document 1, an unbalanced amount and an unbalanced position of clothes in the washing tub are detected at the time of dehydration, and if there is an imbalance, a plurality of baffles evenly provided in the circumferential direction of the dehydration tub are provided. A technique for positively eliminating the unbalanced state of the dehydration tank by injecting water is disclosed.

JP-A-2017-56025

In the washing machine of Patent Document 1, water is injected into the baffle via a water receiving ring unit fixed to the upper end of the inner peripheral surface of the dehydration tub. The water receiving ring unit has three water guides in which three layers are layered in the radial direction, and each of the three water guides is formed with a water passage path through which regulated water can flow to any of the baffles.

The dehydration tank is arranged in the outer tank, and a nozzle unit capable of individually injecting adjusting water into each water guide is fixed to the upper end of the outer tank. The nozzle unit has three water injection nozzles arranged above the three gutters. Each water injection nozzle is aligned with the washing machine stopped so that the adjusting water can be injected into each water guide.

If there is no eccentricity in the dehydration tank, the dehydration tank and the outer tank rotate in synchronization, so that the adjusting water is properly injected from each water injection nozzle into each water guide. On the other hand, if there is an eccentricity in the dehydration tank, the dehydration tank and the outer tank do not rotate in synchronization, so the adjustment water cannot be properly injected from each water injection nozzle to each water guide, and each water injection There is a problem that the adjusting water from the nozzle is injected into the wrong gutter. In that case, it is not possible to properly control the unbalanced state of the dehydration tank.

In particular, when there is an eccentricity in the upper part or the central part in the height direction in the dehydration tank, and when the eccentricity position is positioned so as to face the upper part and the lower part of the dehydration tank, a facing eccentric state (two eccentricities in the vertical direction). When the positions are arranged on opposite sides and the two eccentric positions are displaced in the opposite directions in the horizontal direction), the vibration force at the upper end of the dehydration tank causes the upper end of the outer tank to run out. Is likely to occur, and the problem that the adjusted water from each water injection nozzle is injected into the wrong water guide gutter is likely to occur. In addition, in a vertical washing machine, the strength of the outer tub is relatively low, so when the dehydration tub rotates at a relatively low rotation speed, the outer tub resonates and the upper end of the outer tub shakes. growing.

Therefore, the present invention can provide a washing machine capable of more appropriately controlling the unbalanced state of the dehydration tub even if the laundry is unevenly distributed in the washing tub during the dehydration step.

The washing machine according to the present invention is arranged in the outer tub, the dehydration tub in which the pulsator is arranged at the bottom, and the dehydration tub are arranged at equal intervals in the circumferential direction with respect to the inner peripheral surface of the dehydration tub, and near the bottom. Three or more water pipes that are opened with a water pipe and have a circulation water port at the upper end, and three or more annular water pipes that are fixed to the upper end of the dehydration tank and connected to the upper end of the water pipe. A water receiving ring unit in which water pipes are layered in the radial direction, a nozzle unit fixed to the upper end of the outer tank and capable of individually injecting adjusted water into each water pipe, and vibration of the outer tank are detected. Acceleration detecting means for detecting acceleration, a position detecting device for transmitting a pulse signal according to the rotation of the dehydration tank, an eccentricity detecting means for detecting an eccentric amount and an eccentric position in the dehydration tank, and deviation in the dehydration step. When the core amount reaches a predetermined eccentric amount threshold, the nozzle unit is provided with a control means for controlling the nozzle unit so as to inject water into the water pipe portion corresponding to the eccentric position, and the control means is provided to the nozzle unit. On the other hand, the eccentric position detected by the eccentricity detecting means is controlled differently depending on whether the eccentric position is located at the upper part of the dehydration tank or at the center in the height direction or at the lower part of the dehydration tank. To do.

In the present invention, different control is performed depending on whether the eccentric position of the nozzle unit is at the upper part of the dehydration tank or at the center in the height direction and at the lower part of the dehydration tank, for example, depending on the nozzle unit. It means that at least one of the various thresholds used when performing water injection control differs depending on whether the eccentric position is at the upper part of the dehydration tank or at the center in the height direction and at the lower part of the dehydration tank.

In the washing machine according to the present invention, the control means starts controlling the nozzle unit so as to inject water into the water pipe portion in the dehydration step, and then the amount of eccentricity detected by the eccentricity detecting means is measured. The nozzle unit is controlled so as to stop the injection of water into the water pipe portion when the acceleration threshold value becomes equal to or lower than a predetermined acceleration threshold value, and the eccentric position is located at the upper portion of the dehydration tank or the central portion in the height direction. In some cases, the acceleration threshold is preferably smaller than the acceleration threshold when the eccentric position is in the lower part of the dehydration tank.

In the washing machine according to the present invention, the eccentricity threshold when the eccentric position is at the upper part of the dehydration tub or at the center in the height direction is the eccentricity threshold when the eccentric position is at the lower part of the dehydration tub. It is preferably smaller than the eccentricity threshold.

In the washing machine according to the present invention, in the dehydration step, the control means injects water into the water passage pipe portion corresponding to the eccentric position only when the rotation speed of the dehydration tank is equal to or less than a predetermined upper limit rotation speed at which water can be injected. When the eccentric position is at the upper part of the dehydration tank or at the center in the height direction, the upper limit rotation speed at which water can be injected is such that the eccentric position is at the lower part of the dehydration tank. It is preferable that it is smaller than the upper limit rotation speed at which water can be injected.

In the washing machine according to the present invention, when the water injection limit amount that can be injected into the water pipe portion changes according to the rotation speed of the dehydration tank, the control means injects water into the water pipe portion in the dehydration step. It is preferable to control the nozzle unit so that the amount of water does not exceed the water injection limit amount according to the rotation speed of the dehydration tank.

According to the present invention, when the eccentric position in the dehydration tank is at the upper part of the dehydration tank or at the center in the height direction, and when the eccentric position is at the lower part of the dehydration tank, the nozzle of the nozzle unit and the nozzle It is conceivable that the positional relationship between the water guide tubs is likely to change, but by performing different controls according to the eccentric position in the dehydration tank, the change in the positional relationship between the nozzle and the water guide tub is suppressed. As a result, it is possible to prevent the adjustment water from the nozzle unit from being injected into the erroneous water guide gutter, and to appropriately control the elimination of the unbalanced state of the dehydration tank 2.

According to the present invention, when the rotation speed of the dehydration tank in the dehydration step is smaller than the resonance rotation speed and the eccentric position is at the lower part of the dehydration tank, if the amount of water injection is too large, the rotation speed of the dehydration tank increases. After the resonance speed becomes higher than the resonance speed, there is a possibility that the eccentric state will occur and the vibration will increase. However, since the acceleration threshold is set to a relatively large value, water injection into the water flow pipe has started. After that, the water injection to the water flow pipe portion is stopped so that the water injection is completed early while the water injection amount does not become too large. As a result, it is possible to suppress the change in the positional relationship between the nozzle and the water guide tub, and prevent the adjustment water from the nozzle unit from being injected into the wrong water guide.

Further, when the rotation speed of the dehydration tank in the dehydration step is equal to or higher than the resonance rotation speed and the eccentric position is at the upper part of the dehydration tank or the central part in the height direction, the vibration of the upper end portion of the dehydration tank is large, and the nozzle and the guide are connected. The positional relationship of the water tub is likely to change, but since the acceleration threshold is set to a relatively small value, after water injection into the water flow pipe is started, until the vibration of the dehydration tank becomes relatively small, the water flow pipe Water injection to is continued. As a result, it is possible to suppress the change in the positional relationship between the nozzle and the water guide tub, and prevent the adjustment water from the nozzle unit from being injected into the wrong water guide.

According to the present invention, when the eccentric position is in the upper part of the dehydration tank or the central part in the height direction, the positional relationship between the nozzle of the nozzle unit and the water guide tub is likely to change, but the eccentricity threshold is set relatively small. Therefore, the water injection process can be started at an early stage where the positional relationship between the nozzle and the water guide tub is unlikely to change. As a result, it is possible to suppress the change in the positional relationship between the nozzle and the water guide tub, and prevent the adjustment water from the nozzle unit from being injected into the wrong water guide.

According to the present invention, when the eccentric position is in the upper part of the dehydration tank or the central part in the height direction, the outer tank resonates when the rotation speed of the dehydration tank becomes high and approaches the resonance rotation speed of the outer tank. The positional relationship between the nozzle and the headrace is likely to change due to large vibrations, but since the upper limit rotation speed at which water can be injected is set relatively small, the rotation speed of the dehydration tank is low and does not approach the resonance rotation speed of the outer tank. At the stage, water injection into the water flow pipe is stopped. As a result, it is possible to suppress the change in the positional relationship between the nozzle and the water guide tub, and prevent the adjustment water from the nozzle unit from being injected into the wrong water guide.

According to the present invention, in the dehydration step, the nozzle unit is controlled so that the amount of water injected into the water pipe portion does not exceed the water injection limit amount according to the rotation speed of the dehydration tank, so that the adjusted water is restricted from the nozzle unit. It is possible to prevent the adjustment water from being wasted due to the water being injected in excess of the amount.

It is a perspective view which shows the appearance of the washing machine 1 which concerns on embodiment of this invention. It is a schematic diagram which shows the structure of the washing machine 1 of FIG. FIG. 3 is a plan view of a part of the washing machine 1 of FIG. 1 as viewed from above. It is a cross-sectional view of the dehydration tub 2 which the washing machine 1 of FIG. 1 has. It is a partial vertical sectional view of the washing machine 1 of FIG. 6 (a) is a _{cross-sectional view taken along the line a 1-} a ₁ of FIG. 3, FIG. 6 (b) is a cross-sectional view taken along the line _{a 2-} a _{2 of FIG.} is a cross-sectional view of _a 3 -a ₃ line in FIG. FIG. 7 (a) is a view of the baffle 8 formed on the inner peripheral surface 2a 1 of the dehydration tank 2 as viewed from the inner peripheral side, and FIG. 7 (b) is a view of a ₁ −a _{1 of FIG. 7 (a).} It is sectional drawing in the line. FIG. 8 (a) is a diagram showing the resultant force of gravity and centrifugal force acting on the water surface, and FIG. 8 (b) shows changes in the water surface angle when the rotation speed of the dehydration tank 2 is variously changed. Shown. It is an electric block diagram of the washing machine 1 of FIG. It is a figure explaining the eccentricity amount threshold (ma). It is a figure explaining the water injection possible upper limit rotation speed (Na). It is a figure explaining the acceleration threshold value (mc). It is a figure for demonstrating the flow of control in the dehydration process of the washing machine 1 of FIG. It is a parameter table which shows the water supply valve 31a, 31b, 31c to open. It is a schematic diagram which shows the eccentric position in the dehydration tank 2. It is a flowchart which shows the flow of control in the dehydration process of the washing machine 1 of FIG. It is a flowchart which shows the eccentric position adjustment processing. It is a graph which showed the relationship between the acceleration obtained from the acceleration sensor 56, and the pulse signal ps obtained from a proximity switch 55. It is a flowchart which shows the process of eccentricity amount and eccentric position measurement. It is a flowchart which shows the process of the start-up determination. Dehydration It is a flowchart which shows this process. It is a graph which shows the outline of the dehydration process of the washing machine 1 of FIG. It is a flowchart which shows the process of a water injection process. It is a schematic diagram which shows the unbalanced state in a dehydration tank 2. It is the data which shows the change of the vibration in each unbalanced state. It is a flowchart which shows the procedure of the modification of the dehydration process of the washing machine 1 which concerns on embodiment of this invention. It is a flowchart which shows the procedure of the modification of the dehydration process of the washing machine 1 which concerns on embodiment of this invention.

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

FIG. 1 is a perspective view showing the appearance of a vertical washing machine (hereinafter, referred to as “washing machine”) 1 according to the embodiment of the present invention. FIG. 2 is a schematic view showing the configuration of the washing machine 1 of the present embodiment. FIG. 3 is a plan view of a part of the washing machine 1 of the present embodiment as viewed from above. FIG. 4 is a cross-sectional view of the dehydration tub 2 included in the washing machine 1. FIG. 5 is a partial vertical sectional view of the washing machine 1 of the present embodiment.

The washing machine 1 of the present embodiment includes a washing machine main body 1a, a dehydration tub 2, an outer tub 3, a water receiving ring unit 5, a nozzle unit 30, a drive unit 50, and a control means 60 (see FIG. 9). And.

The washing machine main body 1a shown in FIG. 1 has a substantially rectangular parallelepiped shape. On the upper surface of the washing machine main body 1a, an opening 11 for putting in and taking out laundry is formed in the dehydration tub 2, and an opening / closing lid 11a capable of opening and closing the opening 11 is attached.

The outer tub 3 is a bottomed tubular member arranged inside the washing machine main body 1a, and can store washing water inside. As shown in FIG. 2, an acceleration sensor 56 capable of detecting acceleration in three directions of the left-right direction, the up-down direction, and the front-rear direction is attached to the outer peripheral surface 3a of the outer tank 3.

The dehydration tank 2 is a bottomed tubular member that is arranged coaxially with the outer tank 3 in the outer tank 3 and is rotatably supported. The dehydration tub 2 can accommodate laundry inside, and has a large number of water passage holes on its wall surface 2a.

A pulsator (stirring blade) 4 is rotatably arranged at the center of the bottom 2c of the dehydration tank 2. As shown in FIG. 2, the pulsator 4 includes a substantially disk-shaped pulsator main body 4a, a plurality of upper blade portions 4b formed on the upper surface of the pulsator main body 4a, and a plurality of lower blades formed on the lower surface of the pulsator main body 4a. It has a part 4c. Such a pulsator 4 agitates the washing water stored in the outer tub 3 to generate a water flow.

As shown in FIG. 4, three baffles (water injection pipes) 8 as water pipes are provided on the inner peripheral surface 2a1 of the dehydration tank 2 at equal intervals (equal angles) in the circumferential direction. Each baffle 8 extends in the vertical direction from the bottom 2c of the dehydration tank 2 to the upper end, and is formed so as to project from the inner peripheral surface 2a1 of the dehydration tank 2 toward the axis S1. Further, each baffle 8 is hollow and has an arcuate cross-sectional shape. As described above, the shape of the baffle 8 is such that the protrusion of the dehydration tank 2 to the axis S1 is small and the baffle 8 spreads along the circumferential direction of the dehydration tank 2, thereby suppressing the narrowing of the accommodation space of the dehydration tank 2. it can.

As shown in FIG. 2, a horizontally long circulation water port 80 is formed at the upper end of such a baffle 8. Further, at the lower end of the baffle 8, an opening 81 that opens in the vicinity of the bottom 2c of the dehydration tank 2, more specifically below the pulsator main body 4a, is formed.

Therefore, in the washing step in which the drain valve 10a (see FIG. 2) is closed and the washing water is stored in the outer tub 3, the lower blade portion 4c of the pulsator 4 stirs as shown by the arrow in FIG. The washed water is infiltrated through the opening 81, rises inside the baffle 8, is discharged from the circulating water port 80, and the clothes are shower-washed. Further, by repeating this operation, the washing water circulates in the dehydration tub 2. That is, the baffle 8 has a function of circulating washing water.

A partition 8a extending from the circulation water port 80 to a position close to the inner peripheral surface 2a1 of the dehydration tank 2 is provided in the vicinity of the upper end of the baffle 8. The section 8a extends radially outward from the upper edge of the circulating water port 80 and then curves downward. A gap 8b (see FIG. 2) is formed between the partition 8a and the inner peripheral surface 2a1 of the dehydration tank 2, and the adjusting water supplied from the water receiving ring unit 5 passes through the gap 8b. It flows downward.

As shown in FIGS. 3 and 5, the water receiving ring unit 5 has three layers of annular water gutters 5a, 5b, and 5c opened upward in the radial direction toward the axis S1 of the dehydration tank 2. As shown in FIG. 2, it is fixed to the upper end of the inner peripheral surface 2a1 of the dehydration tank 2. The number of water guide gutters 5a, 5b, and 5c is the same as that of the baffle 8, and the water guides 5a, 5b, and 5c are formed so that the adjusting water can flow to any of the baffles 8 independently.

As shown in FIG. 5, the upper ends of the water guides 5a, 5b, 5c are arranged at substantially the same height, and the depths of the water guides 5a, 5b, 5c are different from each other. That is, the water guide gutters 5a, 5b, 5c is towards the inner peripheral side from the outer side, deep depth _{n a} of the water guide gutters 5a, depth _{n b} of the water guide gutters 5b, in order of depth _{n c} of the water guide gutters 5c Become. _{Therefore, the bottom surfaces 5 ta} , 5 _tb , and 5 _tc of the gutters 5a, 5b, and 5c are arranged at different heights, and the bottom surface 5 _{ta of the} gutter 5a is arranged at the highest position, from the outer peripheral side to the inner side. _{The bottom surface 5 tb of} the water guide gutter 5b and the bottom _{surface 5 tc} of the water guide gutter 5c are arranged at lower positions in this order toward the circumferential side.

The water guides 5a, 5b, and 5c have a width (diameter length) t _{a1 of} the water guide 5a, a width (diameter length) t _b1 , and a protrusion 6c of the water guide 5a from the outer peripheral side to the inner peripheral side. Width (length in the radial direction) t _c1 becomes shorter in this order.

As shown in FIG. 5, the upper ends of the water guides 5a, 5b, and 5c have protrusions 6a, 6b, and 6c that protrude inward in the radial direction from the outer peripheral wall thereof. The protrusions 6a, 6b, 6c are formed over the entire circumference of the water guide gutters 5a, 5b, 5c. Radial length of the protruding portions 6a, 6b, 6c are identical over the entire periphery, towards from the outer periphery to the inner periphery, the radial length t _a2, radial length of the projecting portion 6b of the protruding portion 6a The length becomes shorter in the order of _{t b2} and the radial length t _{c2 of the protruding portion 6c.}

If the adjusting water is injected into the water guides 5a, 5b, 5c while the dehydration tank 2 is rotating, the adjusting water will stick to the outer wall of the water guides 5a, 5b, 5c due to centrifugal force. At that time, since the protrusions 6a, 6b, 6c are formed at the upper ends of the water guides 5a, 5b, 5c, it is possible to prevent the adjusting water from splashing from the inside of the water guides 5a, 5b, 5c to the outside.

The protrusion 6c of the water guide 5c is formed to be the shortest, but since the depth of the water guide 5c is the deepest, the adjusting water has a thin thickness over a wide range of the outer peripheral wall below the protrusion 6c of the water guide 5c. Stick. On the other hand, the protrusions 6a and 6b of the water guides 5a and 5b are formed longer than the protrusions 6c of the water guide 5c, but the depth of the water guides 5a and 5b is deeper than that of the water guide 5c. Therefore, below the protrusions 6a and 6b of the gutters 5a and 5b, the adjusting water sticks to a small area of the outer peripheral wall with a thick thickness. As a result, the dehydration tank 2 can rotate in a state where substantially the same amount of adjusting water is held inside the water guides 5a, 5b, 5c in any of the water guides 5a, 5b, 5c.

As shown in FIG. 5, since the protrusions 6a, 6b, 6c are formed at the upper ends of the water guides 5a, 5b, 5c, the protrusions 6a, 6b are formed at the upper ends of the water guides 5a, 5b, 5c. , 6c are formed with annular openings 35a, 35b, 35c arranged on the inner side in the radial direction, respectively. Therefore, the water injection nozzles 30a, 30b, 30c inject the adjusting water into the water guides 5a, 5b, 5c from the openings 35a, 35b, 35c formed at the upper ends of the water guides 5a, 5b, 5c. In the present embodiment, the widths (diameter lengths) of the openings 35a, 35b, 35c formed at the upper ends of the water guides 5a, 5b, 5c are formed to be the same. For the width of the openings 35a, 35b, 35c, for example, considering the diameters of the water injection nozzles 30a, 30b, 30c, the adjusted water from the water injection nozzles 30a, 30b, 30c is properly injected into the water guides 5a, 5b, 5c. It is set to be done.

As shown in FIGS. 3 and 6 (a), an opening 5A is formed at the lower end of the water gutter 5a so as to open outward in the radial direction, and the water gutter 5a and the inside of the baffle 8 communicate with each other. ing.

Further, as shown in FIGS. 3 and 6 (b), an opening 5B that opens outward in the radial direction is formed at the lower end of the water guide 5b, and water passes under the water guide 5a. The water guide gutter 5b and the inside of the baffle 8 communicate with each other via the path 5Ba. The water flow path 5Ba extends horizontally and radially outward from the opening 5B.

Further, as shown in FIGS. 3 and 6 (c), an opening 5C is formed at the lower end of the water guide 5c so as to open outward in the radial direction, and the lower portion of the water guide 5a and the water guide 5b is formed. The water guide gutter 5c and the inside of the baffle 8 communicate with each other via the passing water passage 5Ca. The water flow path 5Ca extends horizontally and radially outward from the opening 5C.

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

FIG. 7 (a) is a view of the baffle 8 formed on the inner peripheral surface 2a 1 of the dehydration tank 2 as viewed from the inner peripheral side, and FIG. 7 (b) is a view of a ₁ −a _{1 of FIG. 7 (a).} It is sectional drawing in the line.

As shown in FIG. 7B, a projecting wall portion 82 projecting inward in the radial direction is provided near the lower end of the inner peripheral side wall of the baffle 8. That is, a part of the inner peripheral side wall of the baffle 8 projects inward in the radial direction. As shown in FIGS. 7 (a) and 7 (b), a water receiving plate 85 is formed inside the baffle 8 so as to project radially inward from the outer peripheral side wall thereof. The water receiving plate 85 is arranged at the same height as the protruding wall portion 82, and the radial inner end portion 85a of the water receiving plate 85 is arranged inside the protruding wall portion 82. A gap is formed between the radial inner end portion 85a of the water receiving plate 85 and the tip inner peripheral surface of the protruding wall portion 82, and the adjusting water supplied to the water storage space 8a passes through the gap. It flows into the drainage space 8b.

The internal space of the baffle 8 has a water storage space 8a arranged above the protruding wall portion 82 on which the water receiving plate 85 is arranged, and a drainage space 8b arranged below the protruding wall portion 82. The water storage space 8a is a space for storing the regulated water from the water guides 5a, 5b, 5c, and the drainage space 8b is a space for draining the regulated water flowing out from the water storage space 8a. As shown in FIGS. 7 (a) and 7 (b), the radial thickness of the water storage space 8a and the radial thickness of the drainage space 8b are substantially the same, whereas the vertical length of the drainage space 8b is It is shorter than the vertical length of the water storage space 8a, and the circumferential length of the drainage space 8b is shorter than the circumferential length of the water storage space 8a. Therefore, the volume of the water storage space 8a is larger than the volume of the drainage space 8b.

The adjusting water injected into the water storage space 8a of the baffle 8 is held by the water receiving plate 85 arranged in the protruding wall portion 82 so as not to flow downward, and the protruding wall portion 82 is held along the upper surface of the water receiving plate 85. It flows inward in the radial direction. When the adjusting water is injected into the water storage space 8a of the baffle 8 while the dehydration tank 2 is rotated, the adjusting water sticks to the outer peripheral walls of the water guides 5a, 5b, 5c due to centrifugal force, so that the adjusting water is stored in the water storage space 8a. It is held inside.

FIG. 8A is a diagram showing the resultant force of gravity and centrifugal force acting on the water surface in the headrace. In FIG. 8, when the angle θ (water surface angle θ) with respect to the horizon of the water surface is, the gravity acting on the water surface is mg, the centrifugal force is mrω ² , and tan θ = mrω ² / mg.

FIG. 8B shows the change in the water surface angle when the rotation speed of the dehydration tank 2 is variously changed. However, the radius of the dehydration tank 2 is 0.24 (m). For example, when the rotation speed of the dehydration tank 2 is 100 rpm, the angular velocity ω is 10.5. At that time, ^{the value of rω 2} is 26.3, and if the gravitational acceleration g is 9.8 m / s ² , the water surface angle θ is 69.58 degrees.

The water surface angle θ of the adjusted water in the water storage space when the dehydration tank 2 is rotating changes according to the rotation speed of the dehydration tank 2. That is, as shown in FIG. 8B, when the rotation speed of the dehydration tank 2 is small, the centrifugal force is small, so that the water surface angle θ is relatively small, and when the rotation speed of the dehydration tank 2 is large, the centrifugal force is high. Since it is large, the water surface angle θ is relatively large.

The adjusted water to be injected into the baffle 8 can be maintained in the baffle 8 by the water receiving plate 85 up to the water injection limit amount (upper limit amount that can be injected) of the adjusted water according to each rotation speed of the dehydration tank 2. When the water injection limit amount is exceeded, the excess amount of adjusted water is drained through a gap formed between the radial inner end portion 85a of the water receiving plate 85 and the tip inner peripheral surface of the protruding wall portion 82. ..

The water injection limit amount of the adjusted water that can be maintained by the water receiving plate 85 in the baffle 8 described above changes depending on the water surface angle θ according to each rotation speed of the dehydration tank 2. That is, when the rotation speed of the dehydration tank 2 is small, the water surface angle θ is relatively small, so the water injection limit amount of the adjusting water is small, and when the rotation speed of the dehydration tank 2 is large, the water surface angle θ is relatively large, so that the adjustment water is adjusted. The water injection limit will increase. In the baffle 8 of the present embodiment, the water injection limit amount that can be injected into the baffle 8 changes according to the rotation speed of the dehydration tank 2.

In the present embodiment, the position (vertical height) and radial length of the water receiving plate 85 are adjusted so that water is stored above the water receiving plate 85 when the rotation speed of the dehydration tank 2 exceeds the resonance rotation speed. The center of gravity of the water is set to be substantially at the same height as the center in the height direction of the dehydration tank 2 (the center in the height direction of the dehydration tank 2).

For example, FIG. 7B shows the water surface at 200 rpm, which is the resonance rotation speed, and the center of gravity of the adjusting water stored above the water receiving plate 85 of the baffle 8 at that time is the dehydration tank 2. It is set to be near the center of the height direction of. In FIG. 7B, when the amount of the adjusting water stored above the water receiving plate 85 of the baffle 8 is derived, the adjusting water is not stored radially inside the storage space 8a, so that the amount of water is not stored. Is deducted.

The nozzle unit 30 individually injects adjusting water into such water guides 5a, 5b, and 5c. The nozzle unit 30 includes three water injection nozzles 30a, 30b, 30c arranged above the water guides 5a, 5b, 5c, and water supply valves 31a, 31b, respectively connected to these water injection nozzles 30a, 30b, 30c. It has 31c and. The water injection nozzles 30a, 30b, 30c are provided in the same number as the water guides 5a, 5b, 5c, and are attached to the upper end of the outer tank 3 at positions where water can be injected into the separate water guides 5a, 5b, 5c. In this embodiment, tap water is used as the adjusting water. Further, as the water supply valves 31a, 31b and 31c, it is also possible to adopt a direction switching water supply valve.

With such a configuration, in the dehydration step in which the drain valve 10a is opened and the washing water in the outer tub 3 is discharged from the drain port 10, the water injection nozzles 30a, 30b, 30c of the nozzle unit 30 receive the water. The adjusting water injected into the water guides 5a, 5b, 5c of the water ring unit 5 flows into the baffle 8.

For example, when the adjusting water is injected from the water injection nozzle 30a, as shown by the arrow in FIG. 6A, the adjusting water flows from the water guide gutter 5a through the opening 5A into the baffle 8a. Similarly, when the adjusting water is injected from the water injection nozzle 30b, as shown by the arrow in FIG. 6B, the adjusting water flows from the water guide gutter 5b into the baffle 8b through the water flow path 5Ba and the opening 5B. .. When the adjusting water is injected from the water injection nozzle 30c, as shown by the arrow in FIG. 6C, the adjusting water flows from the water guide 5c into the baffle 8c through the water passage 5Ca and the opening 5C.

When the dehydration tank 2 is in a high-speed rotation state, the adjusting water that has flowed into the baffle 8 sticks to the inner peripheral surface 2a1 of the dehydration tank 2 due to centrifugal force and stays there. As a result, the weight of the baffle 8 increases and the balance of the dehydration tank 2 changes. As described above, the baffle 8 has a pocket baffle structure capable of storing adjusted water by centrifugal force. Then, when the dehydration step is nearing the end and the rotation speed of the dehydration tank 2 decreases, the centrifugal force in the baffle 8 gradually attenuates, and the adjusting water flows out from the opening 81 due to gravity and passes through the drain pipe 10 to the outer tank. 3 It is drained to the outside. At this time, the adjusting water flows below the pulsator main body 4a through the opening 81. Therefore, the adjusting water is drained without wetting the clothes above the pulsator body 4a.

The drive unit 50 shown in FIG. 2 is driven by the dehydration tank 2 and the pulsator 4 by rotating the pulley 52 and the belt 53 by the motor 51 and rotating the drive shaft 54 extending toward the bottom 2c of the dehydration tank 2. A force is applied to rotate the dehydration tank 2 and the pulsator 4. The washing machine 1 mainly rotates only the pulsator 4 in the washing step, and integrally rotates the dehydration tub 2 and the pulsator 4 at high speed in the dehydration step. Further, in the vicinity of one of the pulleys 53, a proximity switch 55 capable of detecting the passage of the mark 52a formed on the pulley 52 is provided.

FIG. 9 is a block diagram showing an electrical configuration of the washing machine 1 of the present embodiment. The operation of the 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 connects the memory 62 to the control means 60. When the microcomputer executes the program stored in the memory 62 by the control means 60, a predetermined operation operation is performed, and data or the like used when executing the program is temporarily stored in the memory 62. Is remembered.

Further, the memory 62 has a predetermined rotation speed (N1) lower than the resonance point (resonance rotation speed) CP of the dehydration tank 2, and a first eccentricity threshold (ma), which are values described in detail below. Eccentricity threshold (ma ₁ ), second eccentricity threshold (ma ₂ ), third eccentricity threshold (ma ₃ ), first water injection upper limit rotation speed (Na) as water injection possible upper limit rotation speed (Na) ₁ ) and the second upper limit rotation speed at which water can be injected (Na ₂ ), the first acceleration threshold (mc ₁ ) as the acceleration threshold (mc), the second acceleration threshold (mc ₂ ) and the third acceleration threshold (mc ₃ ), dehydration. The steady rotation speed etc. are stored. In the present embodiment, the resonance point (resonance rotation speed) CP of the dehydration tank 2 is set lower than the resonance rotation speed of the outer tank 3 itself.

(Eccentricity threshold)
The eccentricity threshold value (ma) is the eccentricity amount in the dehydration tank 2 for determining whether or not to start the water injection process of the adjusting water from the water injection nozzles 30a, 30b, 30c to the water guides 5a, 5b, 5c. It is a threshold. Therefore, when the eccentric amount in the dehydration tank 2 exceeds the eccentric amount threshold value (ma), the injection process is performed.

As the eccentricity threshold (ma), as shown in FIG. 10, when the rotation speed of the dehydration tank 2 is smaller than the resonance rotation speed, the first eccentricity threshold is irrespective of the eccentric position in the dehydration tank 2. (Ma ₁ ) is set. Further, when the rotation speed of the dehydration tank 2 is larger than the resonance rotation speed and the eccentric position in the dehydration tank 2 is below the dehydration tank 2, the second eccentricity threshold (ma ₂ ) is set. _{A third eccentricity threshold (ma 3} ) is set when the dehydration tank 2 is located above the dehydration tank 2 and when the dehydration tank 2 is located at the center in the height direction. The third eccentric amount threshold value (ma ₃ ) is a value smaller than the second eccentricity amount threshold value (ma _2).

That is, when the rotation speed of the dehydration tank 2 is higher than the resonance rotation speed, there is an eccentricity in the upper part in the dehydration tank 2 or the central part in the height direction, and there is an eccentricity in the lower part in the dehydration tank 2. In comparison, the vibration force at the upper end of the dehydration tank 2 increases the vibration of the upper end of the outer tank 3, and the positional relationship between the water injection nozzles 30a, 30b, 30c of the nozzle unit 30 and the water guide tubs 5a, 5b, 5c becomes large. _{Since it is easy to change, the third eccentricity threshold (ma 3} ) is set so that the water injection process is started at an early stage where the positional relationship between the water injection nozzles 30a, 30b, 30c and the water guide tubs 5a, 5b, 5c is hard to change. It is set to a value smaller than the second eccentricity threshold (ma _2).

(Upper limit rotation speed at which water can be injected)
The water injection possible upper limit rotation speed (Na) is the upper limit value of the rotation speed of the dehydration tank 2 capable of injecting the adjusting water from the water injection nozzles 30a, 30b, 30c into the water guides 5a, 5b, 5c. Therefore, when the rotation speed of the dehydration tank 2 is equal to or less than the upper limit rotation speed (Na) at which water can be injected, the water injection treatment is performed according to the magnitude of the eccentricity of the dehydration tank 2, but the rotation speed of the dehydration tank 2 is water injection. If it is larger than the possible upper limit rotation speed (Na), the water injection treatment is not performed regardless of the magnitude of the eccentricity of the dehydration tank 2.

As shown in FIG. 11, when the eccentric position in the dehydration tank 2 is at the lower part of the dehydration tank 2, the first water injection possible upper limit rotation speed (Na ₁ ) is set as the water injection possible upper limit rotation speed (Na). , When it is located at the upper part of the dehydration tank 2 and when it is located at the center of the dehydration tank 2 in the height direction, the second upper limit rotation speed at which water can be injected (Na ₂ ) is set. The second upper limit rotation speed at which water can be injected (Na ₂ ) is smaller than the _first upper limit rotation speed at which water can be injected (Na 1).

That is, when there is an eccentricity in the upper part or the central part in the height direction in the dehydration tank 2, the outer tank 3 resonates when the rotation speed of the dehydration tank 2 becomes high and approaches the resonance rotation speed of the outer tank 3. Since the positional relationship between the water injection nozzles 30a, 30b, 30c and the water guide tubs 5a, 5b, 5c is likely to change due to large vibration, the rotation speed of the dehydration tank 2 does not approach the resonance rotation speed of the outer tank 3 at a low stage. _{The second water injection upper limit rotation speed (Na 2} ) is set to a value smaller than the first water injection possible upper limit rotation speed (Na ₁ ) so as to stop the water injection into the baffle 8.

(Acceleration threshold)
The acceleration threshold value (mc) is the threshold value of the amount of eccentricity in the dehydration tank 2 when the water injection treatment is completed after the water injection treatment of the adjusted water is started from the water injection nozzles 30a, 30b, 30c to the water guides 5a, 5b, 5c. Is. Therefore, after starting the water injection treatment, the water injection treatment is terminated when the amount of eccentricity in the dehydration tank 2 becomes equal to or less than a predetermined acceleration threshold value (mc).

As an acceleration threshold (mc), as shown in FIG. 12, when the rotation speed of the dehydration tank 2 is smaller than the resonance rotation speed and the eccentric position in the dehydration tank 2 is below the dehydration tank 2, the first The acceleration threshold (mc _{1 ) is set, and the second acceleration threshold (mc 2} ) is set when it is located at the upper part of the dehydration tank 2 and when it is located at the center of the dehydration tank 2 in the height direction.
The first acceleration threshold value (mc ₁ ) is a value larger than the second acceleration threshold value (mc _2).

That is, since the position of the center of gravity of the water injected into the baffle 8 changes (becomes higher) as the rotation speed of the dehydration tank 2 increases, if the eccentric position in the dehydration tank 2 is below the dehydration tank 2. If too much water is added, the rotation speed will increase and the eccentricity will be opposite. Therefore, the first acceleration threshold (mc ₁ ) is the second acceleration threshold so that water injection can be completed early without adding too much water at a low rotation speed. It is set to a value larger than (mc _2).

Further, in a state where the rotation speed of the dehydration tank 2 is larger than the resonance rotation speed, the third acceleration threshold value (mc ₃ ) is set regardless of the eccentric position in the dehydration tank 2.

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 inputs a signal indicating the rotation speed of the motor 51 from the motor control unit 64 in real time to serve as a control element.

An acceleration sensor 56 is connected to the unbalance amount detection unit 65. An acceleration sensor 56 and a proximity switch 55 are connected to the unbalanced position detection unit 66. In the present embodiment, the unbalanced amount detecting unit 65 and the unbalanced position detecting unit 66 constitute an eccentricity detecting means.

As a result, when the proximity switch 55 detects the marker 52a (see FIG. 2), the dehydration tank 2 in the unbalanced amount detection unit 65 is based on the magnitude of the acceleration in the left-right direction, the up-down direction, and the front-back direction obtained from the acceleration sensor 56. The eccentric amount (M) is calculated, and this eccentric amount (M) is output to the unbalanced amount determination unit 67.

The unbalanced position detection unit 66 calculates the angle in the unbalanced direction from the signal indicating the position of the marker 52a input from the proximity switch 55, and sends the unbalanced position signal, which is the eccentric position (N), to the water injection control unit 68. Output. Here, the angle in the unbalanced direction is a relative angle with respect to the baffle 8 in the circumferential direction of the axis S1. In the present embodiment, as an example as shown in FIG. 16, three baffles 8 (A), 8 (B), 8 (C) arranged at equal angular intervals about the axis S1 are relative to the eccentric position. The intermediate position between the baffles 8 (B) and 8 (C) is set to 0 ° to indicate the angle.

When signals indicating the eccentric amount (M) and the eccentric position (N) are input from the unbalance amount determination unit 67 and the unbalance position detection unit 66, the water injection control unit 68 is stored in the control program in advance. Based on this, the baffle 8 to be supplied and the amount of water supplied are determined. Then, the water injection control unit 68 opens the selected water supply valves 31a, 31b, 31c and starts injecting the adjusting water W. When the water injection control unit 68 has an eccentricity (M) equal to or greater than a predetermined reference in the dehydration tank 2, the water injection ring unit 5 is selected from the water injection nozzle 30a based on the calculation of the eccentricity (M). The injection of the adjusting water W is started in at least one of the water guides 5a, 5b, and 5c of the above, and when the eccentricity (M) becomes equal to or less than the predetermined reference, the injection of the adjusting water W is stopped.

In the baffle 8 of the present embodiment, as described above, the water injection limit amount that can be injected into the baffle 8 changes according to the rotation speed of the dehydration tank 2, so that the water injection control unit 68 can inject water into the baffle 8. In the dehydration step, the nozzle unit 30 is controlled so that the amount of water injected into the baffle 8 does not exceed the water injection limit amount according to the rotation speed of the dehydration tank 2.

In the water injection control unit 68, for example, as shown in FIG. 13, the laundry mass D (X), which is a factor of eccentricity, is located between the baffle 8 (B) and the baffle 8 (C) of the dehydration tub 2. In this case, the nozzle unit 30 is controlled so as to supply the adjusting water W to the baffle 8 (A). Further, when the laundry mass D (Y) is in the vicinity of the baffle 8 (A), the nozzle unit 30 is controlled so as to supply the adjusting water W to both the baffle 8 (B) and the baffle 8 (C). To do.

The central control unit 61 opens the water supply valve X and the water supply valve Z as described in the parameter table of FIG. In the present embodiment, as shown in FIG. 15, the eccentric position (N) is specified by dividing the dehydration tank 2 into six equal parts in the circumferential direction to specify one baffle 8 to be injected with water. The case is divided into (N) and an eccentric position (N) that specifies two baffles 8 to be injected with water.

The region Y of the eccentric position (N) that specifies one baffle 8 to be injected with water is the regions (P (A)), (P (B)), and (P (C)). Further, the region Y of the eccentric position (N) required for eliminating the eccentricity is a region (P (AB)), (P (BC)) and (P (CA)). Further, the angles of the regions (P (A)), (P (B)) and (P (C)) about the axis S1 are 20 °, and the regions (P (AB)), (P (BC)) and The angle about the axis S1 of (P (CA)) is set to 100 °.

(Pre-dehydration process)
The pre-dehydration step related to the first half of the dehydration step will be described with reference to FIG. FIG. 16 is a flowchart showing a pre-dehydration step related to the first half of the dehydration step.

In the present embodiment, when the central control unit 61 receives an input signal from a dehydration button (not shown) or a signal that the dehydration step should be started during the washing course operation, the process proceeds to step SP1 and the pre-dehydration step is started.

<Step SP1>

In step SP1, the central control unit 61 loosens and inverts the dehydration tank 2 and then raises the rotation of the dehydration tank 2 to a predetermined rotation speed (N1) lower than the resonance point CP of the dehydration tank 2. When the rotation speed of the dehydration tank 2 reaches a predetermined rotation speed (N1), the process proceeds to step SP2. In the present embodiment, the predetermined rotation speed (N1) is set to 150 rpm, which is lower than the resonance point CP of the dehydration tank 2, which is about 200 rpm.

<Step SP2>

In step SP2, the central control unit 61 executes control for causing the eccentricity detecting means to calculate the eccentricity amount (M) and the eccentricity position θ1 based on the acceleration signal given from the acceleration sensor 56. Specifically, the central control unit 61 causes the central control unit 61 to calculate the eccentricity amount (M) in each direction based on the acceleration signals related to the left-right direction, the up-down direction, and the front-back direction obtained from the acceleration sensor 56, for example.

<Step SP3>

The central control unit 61 compares the calculated eccentric amount (M) with the eccentric amount threshold value (ma) stored in the memory 62, determines whether or not M <ma holds, and determines the start-up. I do. If the central control unit 61 determines that M <ma holds, the process proceeds to step SP4, and if it determines that M <ma does not hold, the central control unit 61 proceeds to step SP5. Here, in step SP3, the first eccentric amount threshold value (ma ₁ ) is used as the eccentricity amount threshold value (ma), and even if the adjusting water W is supplied to the baffle 8, the dehydration tank 2 reaches the dehydration steady rotation speed. It is a threshold value assuming a case where the bias of the laundry is so large that it is difficult to reduce the eccentricity (M) to the extent that the rotation speed of That is, when proceeding to step SP5, it means that the amount of eccentricity (M) is so large that it is difficult to complete the dehydration step even if the adjusting water W is supplied to the baffle 8.

The eccentricity threshold (ma) will be further described. In the present embodiment, the acceleration sensor 56 is applied so that it can detect acceleration in the left-right direction, the up-down direction, and the front-back direction, respectively. Then, different eccentricity threshold values (ma-x, ma-z, may-y) are set for each of the acceleration signals in the left-right direction, the up-down direction, and the front-back direction.

<Step SP4>

In step SP4, the central control unit 61 increases the rotation speed of the dehydration tank 2 when the eccentric amount (M) calculated in step SP2 is smaller than the eccentric amount threshold value (ma). Further, the central control unit 61 continuously controls the eccentricity amount and the eccentric position measurement while increasing the rotation speed of the dehydration tank 2. Here, "continuously" is not necessarily limited to a mode in which it is performed continuously and continuously. When the rotation speed of the dehydration tank 2 rises to an arbitrary plurality of rotation speeds up to the steady dehydration rotation speed, the eccentricity amount / eccentric position measurement may be controlled intermittently. Of course.

In step SP5, the central control unit 61 controls the unbalance correction process.

The control of the unbalance correction process shown in step SP5 will be described with reference to FIG. FIG. 17 is a flowchart showing the procedure of the unbalance correction process.

First, when it is determined by step SP3 that the amount of eccentricity (M) is large enough to be difficult to reduce, the rotation of the dehydration tank 2 is stopped (step SP51). After that, water is supplied to the dehydration tank 2 and the pulsator 4 is driven to stir the laundry in the dehydration tank 2 to eliminate the bias of the laundry (step SP52). After that, the process returns to step SP1.

(Calculation of eccentric amount and eccentric position)
The procedure for calculating the eccentric position θ1 shown in step SP2 will be described with reference to FIGS. 18 to 19.

In the present embodiment, in the dehydration step, the time difference between an arbitrary time point in the signal related to the acceleration indicating at least one cycle t2 of the dehydration tank 2 transmitted from the acceleration sensor 56 and the timing when the pulse signal ps is transmitted from the proximity switch 55. t1 is calculated, the eccentric position θ1 in the circumferential direction in the dehydration tank 2 is calculated from the relationship between the time difference t1 and the rotation speed of the dehydration tank 2, and the eccentric amount (M) is calculated based on the calculated eccentric position θ1. Is performed, and one of the signals from the acceleration sensor 56 is used for calculating the eccentric position θ1.

FIG. 18 is a graph showing the relationship between the information indicating the time change of the acceleration calculated based on the acceleration and the pulse signal ps obtained from the proximity switch 55. In FIG. 18, for convenience, the eccentric position θ1 is calculated from the time difference t1 between the maximum value (Ymax) of the vertical acceleration obtained from the acceleration sensor 56 and the pulse signal ps. In the present embodiment shown in FIG. 18, as an example, an embodiment in which the eccentric position θ1 is calculated from the maximum value (Ymax) and the minimum value (Ymin) of the acceleration is shown, but as another embodiment of the present invention, the acceleration is zero. The eccentric position θ1 may be calculated from any one or more of the maximum value (Ymax) and the minimum value (Ymin) of the point and the acceleration.

FIG. 19 is a flowchart showing a processing procedure for measuring the amount of eccentricity and the position of eccentricity.

<Step SP21>

In step SP21, the central control unit 61 detects acceleration data (MX, MY, MZ) related to the left-right direction, the up-down direction, and the front-back direction from the acceleration sensor 56.

<Step SP22>

In step SP22, the central control unit 61 obtains acceleration data (MX, MY, MZ) from acceleration data (MX, MY, MZ) obtained from the acceleration sensor 56 and pulse signal ps which is an interrupt signal from the proximity switch 55. A calculation process is performed to determine the maximum value (Xmax, Ymax, Zmax) and the minimum value (Xmin, Ymin, Zmin) of.

<Step SP23>

In step SP23, the central control unit 61 calculates and determines the value of one cycle t2, which is the time for one rotation of the dehydration tank 2, from the interval between the plurality of pulse signals ps which are interrupt signals from the proximity switch 55. ..

<Step SP24>

In step SP24, the central control unit 61 sets a maximum value (Xmax, Ymax, Zmax) of a plurality of pulse signals ps which are interrupt signals from the proximity switch 55 and acceleration data (MX, MY, MZ) obtained from step SP22. Therefore, the time difference t1 is calculated and determined. In step SP24, the central control unit 61 also calculates the time differences t1X and t1Z in the left-right direction and the front-back direction in addition to the time difference t1Y which is the time difference t1 in the vertical direction shown in FIG.

<Step SP25>

In step SP25, the central control unit 61 determines the amount of eccentricity from the maximum values (Xmax, Ymax, Zmax) and minimum values (Xmin, Ymin, Zmin) of the acceleration data (MX, MY, MZ) obtained from step SP22. The eccentricity amounts Mx, My, and Mz corresponding to each of the left-right direction, the up-down direction, and the front-back direction, which are (M), are calculated and determined. In the present embodiment, the eccentricity Mx, My, Mz is obtained from the difference between the maximum value (Xmax, Ymax, Zmax) and the minimum value (Xmin, Ymin, Zmin).

<Step SP26>

In step SP26, the central control unit 61 sets eccentric positions θX1, θY1, and θZ1 related to the horizontal direction, the vertical direction, and the front-rear direction from the one cycle t2 obtained from step SP23 and the time difference t1 obtained from step SP24. It is calculated and determined by the following formula.
θX1 = t1X × 360 ÷ t2
θY1 = t1Y × 360 ÷ t2
θZ1 = t1Z × 360 ÷ t2

(Startup judgment)
The start-up determination shown in step SP3 will be described with reference to FIG. FIG. 20 is a flowchart showing a procedure for determining startup.

<Step SP31>

In step SP31, the central control unit 61 selects an eccentric amount (M) showing a larger value from the left-right eccentric amount Mx and the front-rear direction eccentric amount Mz determined by step SP25. In the present embodiment, for convenience of explanation, the selected eccentric amount (M) is referred to as eccentric amount Mxz.

<Step SP32>

In step SP32, the central control unit 61 determines whether or not the eccentric amount Mxz exceeds the eccentric amount threshold (ma) threshold mxz. If the eccentric amount Mxz is less than the threshold value mxz, the central control unit 61 shifts to step SP33. If the eccentric amount Mxz exceeds the threshold value mxz, the central control unit 61 determines that the start-up is impossible, and proceeds to step SP5 to perform the eccentric amount adjustment process.

<Step SP33>

In step SP33, the central control unit 61 determines whether or not the eccentricity amount My in the vertical direction exceeds the threshold value my which is the eccentricity amount threshold value (ma). The central control unit 61 determines that the start-up is possible if the eccentricity amount My is less than the threshold value my. In this case, the rotation speed of the dehydration tank 2 is increased. If the eccentricity amount My exceeds the threshold value my, the central control unit 61 determines that the start-up is impossible, and proceeds to step SP5 to perform the eccentricity amount adjustment process.

(Dehydration main process)
Hereinafter, the control related to the dehydration main step after step SP4 will be described with reference to FIG. FIG. 21 is a flowchart showing the procedure of this dehydration step.

<Step SP51>

In step SP51, the central control unit 61 increases the rotation speed of the dehydration tank 2 by 20 rpm per second until the rotation speed reaches 400 rpm. The central control unit 61 executes step SP6 in parallel while performing step SP51.
<Step SP52>

In step SP52, the central control unit 61 determines whether or not the rotation speed of the dehydration tank 2 has reached 400 rpm. If the rotation speed has not reached 400 rpm, the central control unit 61 shifts to step SP51. If the rotation speed reaches 400 rpm, the central control unit 61 shifts to step SP63.
<Step SP53>

In step SP53, the central control unit 61 increases the rotation speed of the dehydration tank 2 by 5 rpm per second until the rotation speed reaches 600 rpm. The central control unit 61 executes step SP6 in parallel while performing step SP53.

<Step SP54>

In step SP54, the central control unit 61 determines whether or not the rotation speed of the dehydration tank 2 has reached 600 rpm. If the rotation speed has not reached 600 rpm, the central control unit 61 shifts to step SP53. If the rotation speed reaches 600 rpm, the central control unit 61 shifts to step SP55. Here, the acceleration when the rotation speed of the dehydration tank 2 rises to 400 to 600 rpm is lower than that in other rotation ranges because the amount of water dehydrated from the laundry is larger in the rotation range than in other rotation ranges. This is to reduce unnecessary noise caused by dehydrated water.
<Step SP55>

In step SP55, the central control unit 61 increases the rotation speed of the dehydration tank 2 by 20 rpm per second until the rotation speed reaches 800 rpm. The central control unit 61 executes step SP6 in parallel while performing step SP55.
<Step SP56>

In step SP56, the central control unit 61 determines whether or not the rotation speed of the dehydration tank 2 has reached 800 rpm. If the rotation speed has not reached 800 rpm, the central control unit 61 shifts to step SP55. If the rotation speed reaches 800 rpm, the central control unit 61 shifts to step SP57.

<Step SP57>

In step SP57, when the rotation speed of the dehydration tank 2 reaches 800 rpm, which is the steady dehydration rotation speed, the central control unit 61 continues the dehydration process as it is, and after confirming that a predetermined time has elapsed, washing is performed. To finish. In other words, the central control unit 61 rotates the dehydration tank 2 at a steady dehydration speed for a predetermined time to perform the dehydration treatment, as in the dehydration step in normal washing. After that, the dehydration process is completed. Then, when the dehydration is completed, the deceleration of the dehydration tank 2 starts, and the centrifugal force falls below the gravitational acceleration, the adjusting water W in the baffle 8 flows out and is drained.

FIG. 22 is a graph showing an outline of the dehydration process of the washing machine 1 of the present embodiment. In FIG. 22, the vertical axis represents the rotation speed of the dehydration tank 2, and the horizontal axis represents time. In FIG. 22, the behavior of the rotation speed when the rotation speed of the dehydration tank 2 reaches the steady dehydration rotation speed without injecting water into the baffle 8 is shown by a solid line. Further, in FIG. 22, the behavior of the rotation speed when the rotation speed reaches the dehydration steady rotation speed after pouring water into the baffle 8 only once is shown by the upper imaginary line, and the dehydration tank 2 according to step SP5. The behavior of the number of revolutions is shown by the lower imaginary line.

(Water injection process)
The water injection step shown in step SP6 will be described with reference to FIG. FIG. 23 is a flowchart showing an outline of the water injection process.

In step SP6, the central control unit 61 determines whether or not the eccentric amount (M) calculated in step SP2 shown in FIG. 19 is larger than the preset eccentric amount threshold value (ma). Do. When the eccentric amount (M) is lower than the eccentric amount threshold value (ma), the central control unit 61 shifts to the dehydration main step of FIG. 21 without injecting water into the baffle 8. When the eccentric amount (M) is larger than the eccentric amount threshold value (ma), the central control unit 61 determines which position the eccentric position (N) is in the height direction of the dehydration tank 2 ( Eccentric position height judgment). The central control unit 61 determines the acceleration threshold value (mc), the upper limit rotation speed at which water can be injected (Na), and the eccentricity amount threshold value (ma) based on the height of the eccentric position. After that, the central control unit 61 injects water into the baffle 8 in the water injection step, and after the eccentricity amount (M) becomes lower than the acceleration threshold value (mc), the water injection into the baffle 8 is completed. 21 Dehydration The process proceeds to this step.

In the water injection step of the present embodiment, step SP602 is performed under the process of measuring the eccentricity amount and the eccentric position, which has been continuously performed since the rotation speed of the dehydration tank 2 reaches 150 rpm as described above. The eccentric position height determination process and the water injection process in step SP612 are mainly performed.

<Step SP601>

In step SP601, the central control unit 61 determines whether or not the eccentric amount (M) calculated in step SP2 exceeds the eccentric amount threshold value (ma). When the eccentric amount (M) exceeds the eccentric amount threshold value (ma), the process proceeds to step SP602. When the eccentric amount (M) is less than the eccentric amount threshold value (ma), the water injection step is terminated. In step SP601, the first eccentric amount threshold value (ma ₁ ) is used as the eccentricity amount threshold value (ma).

<Step SP602>

In step SP602, the central control unit 61 determines which position the eccentric position (N) is in the height direction of the dehydration tank 2 (eccentric position height determination). Specifically, the central control unit 61 determines whether the eccentric position (N) is located in the upper portion of the dehydration tank 2, the central portion in the height direction of the dehydration tank 2, or the lower portion of the dehydration tank 2. The method for determining the eccentric position height will be described later.

<Step SP603>

In step SP603, the central control unit 61 determines whether or not the rotation speed of the dehydration tank 2 is smaller than the resonance rotation speed. When the rotation speed of the dehydration tank 2 is smaller than the resonance rotation speed, the process proceeds to step SP604. When the rotation speed of the dehydration tank 2 is larger than the resonance rotation speed, the process proceeds to step SP605.

<Step SP604>

In step SP604, the central control unit 61 determines the acceleration threshold value (mc) based on the eccentric position height determined in step SP602. Specifically, when the eccentric position is below the dehydration tank 2, the central control unit 61 determines the acceleration threshold value (mc) as the first acceleration threshold value (mc ₁ ), and the eccentric position is the dehydration tank 2. When it is in the upper part or the central part in the height direction, the acceleration threshold value (mc) is determined _{as the second acceleration threshold value (mc 2).} After that, the process proceeds to step SP612.

<Step SP605>

In step SP605, the central control unit 61 determines the water injection possible upper limit rotation speed (Na) based on the eccentric position height determined in step SP602. Specifically, when the eccentric position is at the lower part of the dehydration tank 2, the central control unit 61 determines the upper limit rotation speed (Na) for water injection to the first upper limit rotation speed for water injection (Na ₁ ), and eccentricity. When the position is in the upper part of the dehydration tank 2 or the central part in the height direction, the upper limit rotation speed (Na) capable of injecting water is determined to _{be the second upper limit rotation speed (Na 2) available for water injection.}

<Step SP606>

In step SP606, the central control unit 61 determines the eccentric amount threshold value (ma) based on the eccentric position height determined in step SP602. Specifically, when the eccentric position is in the lower part of the dehydration tank 2, the central control unit 61 determines the eccentric amount threshold value (ma) as the second eccentric amount threshold value (ma ₂ ), and the eccentricity position is set. When it is located in the upper part of the dehydration tank 2 or in the central part in the height direction, the eccentricity threshold value (ma) is determined to be _{the third eccentricity amount threshold value (ma 3).} After that, the process proceeds to step SP607.

<Step SP607>

In step SP607, the central control unit 61 determines the acceleration threshold value (mc) as the third acceleration threshold value (mc). After that, the process proceeds to step SP608.

<Step SP608>

In step SP608, the central control unit 61 determines whether or not the rotation speed of the dehydration tank 2 is equal to or less than the first water injection possible upper limit rotation speed (Na _{1) determined in step SP605.} When the rotation speed of the dehydration tank 2 is equal to or less than the first water injection possible upper limit rotation speed (Na ₁ ), water injection can be performed, and the process proceeds to step SP609. _{If the rotation speed of the dehydration tank 2 exceeds the first} upper limit rotation speed at which water can be injected (Na 1), water injection cannot be performed and the water injection process is completed.

<Step SP609>

In step SP609, the central control unit 61 determines whether or not the eccentric amount (M) calculated in step SP2 exceeds the eccentric amount threshold value (ma). When the eccentric amount (M) exceeds the eccentric amount threshold value (ma), the process proceeds to step SP610. When the eccentric amount (M) is less than the eccentric amount threshold value (ma), the water injection step is terminated. In step SP609, when the eccentric position is at the lower part of the dehydration tank 2, the second eccentric amount threshold (ma ₂ ) is used as the eccentric amount threshold (ma), and the eccentric position is at the upper part of the dehydration tank 2 or. When located at the center in the height direction, the third eccentricity threshold (ma ₃ ) is used.

<Step SP610>

In step SP610, the central control unit 61 performs a water injection process while maintaining the rotation speed of the dehydration tank 2 without increasing it. After that, the process proceeds to step SP611.

<Step SP611>

In step SP611, the central control unit 61 determines whether or not the eccentric amount (M) exceeds the acceleration threshold value (mc). When the eccentricity amount (M) exceeds the acceleration threshold value (mc), the process proceeds to step SP610 and the water injection step is continued. When the eccentric amount (M) is below the acceleration threshold value (mc), the water injection step is terminated.

In step SP611, when the rotation speed of the dehydration tank 2 is smaller than the resonance rotation speed and the eccentric position is at the lower part of the dehydration tank 2, the first acceleration threshold value (mc ₁ ) is used as the acceleration threshold value (mc). When the eccentric position is in the upper part of the dehydration tank 2 or the central part in the height direction, the second acceleration threshold value (mc ₂ ) is used. When the rotation speed of the dehydration tank 2 is larger than the resonance rotation speed, the third acceleration threshold value (mc ₃ ) is used.

(Eccentric position height judgment)
The method for determining the eccentric position height shown in step SP602 will be described with reference to FIGS. 24 to 25.

As shown in FIG. 24, three types of unbalanced states can be considered as the unbalanced state of the dehydration tank 2. 24 (a) to 24 (c) show the eccentric position in the circumferential direction and the eccentric position in the height direction (vertical direction) in the three types of unbalanced states.

The unbalanced state a is a state in which the eccentric position is in the upper part of the dehydration tank 2, and the unbalanced state b is a state in which the eccentric position is in the central portion in the height direction of the dehydration tank 2, and the unbalanced state c. Is a state in which the eccentric position is at the lower part of the dehydration tank 2.

The upper portion of the dehydration tank 2 is the range from the upper end of the dehydration tank 2 to 1/3 of the height of the dehydration tank 2, and the central portion in the height direction of the dehydration tank 2 is from the upper end of the dehydration tank 2. The range is from 1/3 to 2/3 of the height of the dehydration tank 2, and the lower part of the dehydration tank 2 is a range below 2/3 of the height of the dehydration tank 2 from the upper end of the dehydration tank 2. The range from the lower end of the water tank 2 to 1/3 of the height of the dehydration tank 2). That is, when the upper end to the lower end of the dehydration tank 2 is divided into three equal height ranges, from the upper end of the dehydration tank 2, the upper part of the dehydration tank 2, the central portion of the dehydration tank 2 in the height direction, and the dehydration tank 2 It is divided into three lower areas.

25 (a) to 25 (c) show the removal when the rotation speed of the dehydration tank 2 is variously changed in any of the unbalanced state a, the unbalanced state b, and the unbalanced state c, respectively. It shows the change in vibration of the upper end of the water tank 2. As the vibration of the upper end of the dehydration tank 2, acceleration data (MX, MY, MZ) related to the horizontal direction, the vertical direction, and the front-rear direction detected by the acceleration sensor 56 attached to the outer peripheral surface 3a of the outer tank 3 are used. doing.

As shown in FIGS. 25 (a) to 25 (c), in any of the unbalanced state a, the unbalanced state b, and the unbalanced state c, the vibration of the upper end portion of the dehydration tank 2 in the left-right direction and the front-back direction While the changes are substantially the same, the vertical vibration of the upper end portion of the dehydration tank 2 changes with a value smaller than the horizontal and front-back vibrations.

In the unbalanced state c, the magnitude of the vertical vibration of the upper end of the dehydration tank 2 is significantly smaller than the magnitude of the vibration in the left-right direction and the front-back direction, whereas the unbalanced state a and the unbalanced state In b, the magnitude of the vertical vibration of the upper end portion of the dehydration tank 2 is relatively close to the magnitude of the vibration in the left-right direction and the front-rear direction.

That is, from FIG. 25, the coefficient A is calculated by (Equation 1), where the average value of the acceleration MX in the left-right direction and the acceleration MZ in the front-rear direction, which is the acceleration data obtained from step SP22, is MXZ _{ave and the acceleration MY in the up-down direction.} To do.
A = MXZ _ave / MY (Equation 1)

Therefore, when the coefficient A is larger than 2 (A> 2), it is determined that the unbalanced state is c, and when the coefficient A is smaller than 2 (A <2), the unbalanced state a or the unbalanced state b is used. It can be determined that there is.

If there is no eccentricity in the dehydration tank 2, the dehydration tank 2 and the outer tank 3 rotate in synchronization with each other, so that the adjusting water is appropriate from the water injection nozzles 30a, 30b, 30c to the water guides 5a, 5b, 5c. Is injected into. On the other hand, when the dehydration tank 2 has an eccentricity, the dehydration tank 2 and the outer tank 3 do not rotate in synchronization with each other. There is a problem that the adjusting water is not properly injected into the 5c, and the adjusting water from the water injection nozzles 30a, 30b, 30c is injected into the wrong water guide gutters 5a, 5b, 5c. In that case, the control for eliminating the unbalanced state of the dehydration tank 2 cannot be properly performed.

In particular, when the eccentric position in the dehydration tank 2 is located at the upper part of the dehydration tank 2 or at the center in the height direction, the vibration force at the upper end of the dehydration tank 2 increases the deflection of the upper end of the outer tank 3. Since the positional relationship between the water injection nozzles 30a, 30b, 30c and the water guide tubs 5a, 5b, 5c of the nozzle unit 30 is likely to change, the adjustment water from the water injection nozzles 30a, 30b, 30c is incorrect. The problem of water being injected into 5c is likely to occur.

As shown in FIGS. 25 (a) to 25 (c), if the eccentric position in the dehydration tank 2 is different in the height direction, the vibration state of the dehydration tank 2 is different. Therefore, in the present embodiment, the control method of the nozzle unit 30 is carried out in consideration of the vibration state of the dehydration tank 2, that is, the unbalanced state of the dehydration tank 2.

In the present embodiment, the acceleration sensor 56 is a three-axis sensor capable of detecting acceleration in the left-right direction, the up-down direction, and the front-back direction. As a result, even if the eccentric positions in the dehydration tank 2 are different in the height direction as shown in FIGS. 25 (a) to 25 (c), the eccentric amount (M) and the eccentric position (N) ) Can be detected accurately.

The washing machine 1 of the present embodiment is arranged in the outer tub 3 and is arranged at equal intervals in the circumferential direction with respect to the dehydration tub 2 in which the pulsator 4 is arranged in the bottom 2c and the inner peripheral surface 2a of the dehydration tub 2. In addition, the baffle 8 is three water passage pipes that are open near the bottom 2c and the circulation water port 80 is formed at the upper end, and the three annular water guides 5a and 5b that are connected to the upper end of the baffle 8, respectively. , 5c are stacked in the radial direction, and the water receiving ring unit 5 and the nozzle unit 30 which is fixed to the upper end of the dehydration tank 2 and can individually inject the adjusting water into each of the water guides 5a, 5b, 5c. The acceleration sensor 56, which is an acceleration detecting means for detecting the vibration of the outer tank 3, the proximity switch 55, which is a position detecting device that transmits a pulse signal according to the rotation of the dehydration tank 2, the amount of eccentricity in the dehydration tank 2, and the amount of eccentricity in the dehydration tank 2. When the eccentric amount reaches a predetermined eccentric amount threshold (ma) in the dehydration step, the unbalanced amount detecting unit 65 and the unbalanced position detecting unit 66, which are eccentricity detecting means for detecting the eccentric position, are deviated. A control unit 60 which is a control means for controlling the nozzle unit 30 so as to inject water into the baffle 8 corresponding to the core position is provided, and the control unit 60 has an unbalance amount detection unit 65 and an unbalance with respect to the nozzle unit 30. Different control is performed depending on whether the eccentric position detected by the position detection unit 66 is at the upper part of the dehydration tank 2 or at the center in the height direction and at the lower part of the dehydration tank 2.

According to the washing machine 1 of the present embodiment, the eccentric position in the dehydration tub 2 is in the upper part of the dehydration tub 2 or the central portion in the height direction, and the eccentric position is in the lower part of the dehydration tub 2. In each case, it is conceivable that the positional relationship between the nozzles 30a, 30b, 30c and the headrace 5a, 5b, 5c of the nozzle unit 30 is likely to change, but different controls are performed according to the eccentric position in the dehydration tank 2. By doing so, the change in the positional relationship between the nozzles 30a, 30b, 30c and the water guide tubs 5a, 5b, 5c is suppressed. As a result, it is possible to prevent the adjusting water from the nozzle unit 30 from being injected into the erroneous water guides 5a, 5b, 5c, and to appropriately control the elimination of the unbalanced state of the dehydration tank 2.

In the washing machine 1 of the present embodiment, the control unit 60, which is a control means, is an eccentricity detecting means after starting the control of the nozzle unit 30 so as to inject water into the baffle 8 which is a water pipe portion in the dehydration step. The nozzle unit 30 is controlled so as to stop water injection into the baffle 8 when the amount of eccentricity detected by the unbalanced amount detecting unit 65 and the unbalanced position detecting unit 66 becomes equal to or less than a predetermined acceleration threshold value (mc). _{The second acceleration threshold value (mc 2} ) when the eccentric position is at the upper part of the dehydration tank 2 or at the center in the height direction is the first acceleration when the eccentric position is at the lower part of the dehydration tank 2. It is smaller than the threshold value (mc _1).

According to the washing machine 1 of the present embodiment, when the rotation speed of the dehydration tub 2 in the dehydration step is smaller than the resonance rotation speed and the eccentric position is at the lower part of the dehydration tub 2, if the amount of water injection is too large, After the rotation speed of the dehydration tank 2 rises and becomes larger than the resonance rotation speed, it may be in an opposite eccentric state and the vibration may increase, but the first acceleration threshold (mc ₁ ) is set to a relatively large value. Therefore, after the water injection to the baffle 8 is started, the water injection to the baffle 8 is stopped so that the water injection is completed early while the water injection amount does not become too large. As a result, the change in the positional relationship between the nozzles 30a, 30b, 30c and the water guide tubs 5a, 5b, 5c is suppressed, and the adjusting water from the nozzle unit 30 is injected into the wrong water guides 5a, 5b, 5c. Can be prevented.

In the washing machine 1 of the present embodiment, when the rotation speed of the dehydration tub 2 is larger than the resonance rotation speed and the eccentric position is at the upper part of the dehydration tub or the central portion in the height direction, the third eccentricity threshold value (ma) ₃ ) is smaller than _{the second eccentricity threshold value (ma 2} ) when the eccentric position is at the lower part of the dehydration tank 2.

According to the washing machine 1 of the present embodiment, when the eccentric position is in the upper part of the dehydration tub 2 or the central part in the height direction, the positions of the nozzles 30a, 30b, 30c and the water guide tubs 5a, 5b, 5c of the nozzle unit 30 The relationship is easy to change, but since the third eccentricity threshold (ma ₃ ) is set relatively small, the positional relationship between the nozzles 30a, 30b, 30c and the water guide tubs 5a, 5b, 5c is hard to change at an early stage. Water injection treatment can be started at. As a result, the change in the positional relationship between the nozzles 30a, 30b, 30c and the water guide tubs 5a, 5b, 5c is suppressed, and the adjusting water from the nozzle unit is injected into the wrong water guides 5a, 5b, 5c. Can be prevented.

In the washing machine 1 of the present embodiment, the control unit 60, which is a control means, corresponds to the eccentric position only when the rotation speed of the dehydration tank 2 is equal to or less than a predetermined upper limit rotation speed (Na) of water injection in the dehydration step. The nozzle unit 30 is controlled so as to inject water into the baffle 8 which is a water flow pipe portion, and the second upper limit rotation speed at which water can be injected (when the eccentric position is in the upper part of the dehydration tank 2 or the central part in the height direction). Na ₂ ) is smaller than _{the first water injection possible upper limit rotation speed (Na 1} ) when the eccentric position is at the lower part of the dehydration tank 2.

According to the washing machine 1 of the present embodiment, when the eccentric position is in the upper part of the dehydration tub 2 or the central part in the height direction, the rotation speed of the dehydration tub 2 becomes high and approaches the resonance rotation speed of the outer tub 3. In addition, the positional relationship between the nozzles 30a, 30b, 30c and the water guide tubs 5a, 5b, 5c is likely to change due to the resonance of the outer tank 3 and the large vibration, but the upper limit rotation speed at which water can be injected is set relatively small. Therefore, water injection into the baffle 8 is stopped at a low stage where the rotation speed of the dehydration tank 2 does not approach the resonance rotation speed of the outer tank 3. As a result, the change in the positional relationship between the nozzles 30a, 30b, 30c and the water guide tubs 5a, 5b, 5c is suppressed, and the adjusting water from the nozzle unit 30 is injected into the wrong water guides 5a, 5b, 5c. Can be prevented.

In the washing machine 1 of the present embodiment, when the water injection limit amount that can be injected into the baffle 8 that is the water pipe portion changes according to the rotation speed of the dehydration tank 2, the control unit 60 that is the control means is used in the dehydration step. The nozzle unit 30 is controlled so that the amount of water injected into the baffle 8 does not exceed the water injection limit amount according to the rotation speed of the dehydration tank 2.

According to the washing machine 1 of the present embodiment, in the dehydration step, the nozzle unit 30 is controlled so that the amount of water injected into the baffle 8 does not exceed the water injection limit amount according to the rotation speed of the dehydration tank 2. Therefore, the nozzle unit It is possible to prevent the adjusted water from being wasted because the adjusted water is injected in excess of the water injection limit amount from 30.

(Dehydration process)
Hereinafter, a modification of the control of the dehydration process of the washing machine 1 of the present embodiment will be described with reference to FIGS. 26 and 27. 26 and 27 are flowcharts showing a procedure of a modified example of the dehydration step.

<Step SP101>

In step SP101, the central control unit 61 increases the rotation speed of the dehydration tank 2 to start the dehydration step.

<Step SP102>

In step SP102, the central control unit 61 determines whether or not the rotation speed of the dehydration tank 2 is 150 rpm or more. When the rotation speed is 150 rpm or more, the central control unit 61 shifts to step SP103.

<Step SP103>

In step SP103, the central control unit 61 measures the eccentric amount (M) and the eccentric position (N) of the dehydration tank 2. After that, the process proceeds to step SP104.

<Step SP104>

In step SP104, the central control unit 61 determines whether or not the eccentric amount (M) is equal to or greater than the eccentric amount threshold value (ma). When the eccentric amount (M) exceeds the eccentric amount threshold value (ma), the process proceeds to step SP105. When the eccentric amount (M) is less than the eccentric amount threshold value (ma), the process proceeds to step SP115. In step SP104, the first eccentric amount threshold value (ma ₁ ) is used as the eccentricity amount threshold value (ma).

<Step SP105>

In step SP105, the central control unit 61 determines whether the eccentric position (N) is in the middle or upper part of the dehydration tank 2 (eccentric position height determination). Specifically, the central control unit 61 determines whether the eccentric position (N) is in the upper part of the dehydration tank 2, the central part in the height direction, or the lower part of the dehydration tank 2. The method for determining the eccentric position height is the same as described above. When the eccentric position (N) is in the middle upper part of the dehydration tank 2, the process proceeds to step SP106. When the eccentric position (N) is in the lower part of the dehydration tank 2, the process proceeds to step SP107.

<Step SP106>

In step SP106, the central control unit 61 determines the acceleration threshold value (mc) as the second acceleration threshold value (mc ₂ ). After that, the process proceeds to step SP108.

<Step SP107>

In step SP107, the central control unit 61 determines the acceleration threshold value (mc) as the first acceleration threshold value (mc ₁ ). After that, the process proceeds to step SP108.

<Step SP108>

In step SP108, the central control unit 61 starts the water injection process. After that, the process proceeds to step SP109.

<Step SP109>

In step SP109, the central control unit 61 determines the water injection limit amount for each rotation speed of the dehydration tank 2.

<Step SP110>

In step SP110, the central control unit 61 determines whether or not the eccentric amount (M) exceeds the acceleration threshold value (mc). When the eccentricity amount (M) exceeds the acceleration threshold value (mc), the process proceeds to step SP111. If the eccentricity amount (M) is below the acceleration threshold value (mc), the process proceeds to step SP115. In step SP110, when the eccentric position (N) is in the middle upper part of the dehydration tank 2, the second acceleration threshold value (mc ₂ ) is used as the acceleration threshold value (mc), and the eccentric position (N) is the dehydration tank 2. If at the bottom of, the first acceleration threshold (mc ₁ ) is used.

<Step SP111>

In step SP111, the central control unit 61 determines whether the water injection amount is equal to or less than the water injection limit amount. If the water injection amount is equal to or less than the water injection limit amount, the process proceeds to step SP112. If the water injection amount is not less than or equal to the water injection limit amount, the process proceeds to step SP113.

<Step SP112>

In step SP112, the central control unit 61 continues the water injection process and shifts to step SP109.

<Step SP113>

In step SP113, the central control unit 61 determines whether or not the eccentricity amount (M) exceeds the acceleration threshold value (mc). When the eccentricity amount (M) exceeds the acceleration threshold value (mc), the process proceeds to step SP114. If the eccentricity amount (M) is below the acceleration threshold value (mc), the process proceeds to step SP115. In step SP113, when the eccentric position (N) is in the middle upper part of the dehydration tank 2, the fifth acceleration threshold value (mc ₅ = mc ₂ + α _{2 ) larger than the second acceleration threshold value (mc 2) is set as the acceleration threshold value (mc).} ) Is used and the eccentric position (N) is at the bottom of the dehydration tank 2, the first acceleration threshold (mc ₄ = mc ₁ + α ₁ ) is used. Note that α ₁ and α ₂ are positive numbers that are appropriately set.

<Step SP114>

In step SP114, the central control unit 61 stops the rotation of the dehydration tank 2 to end the dehydration step. After that, the process proceeds to step SP115.

<Step SP115>

In step SP115, the central control unit 61 increases the rotation of the dehydration tank 2 to shift to step SP116.

<Step SP116>

In step SP116, the central control unit 61 determines whether or not the rotation speed of the dehydration tank 2 is 300 rpm or more. When the rotation speed of the dehydration tank 2 is 300 rpm or more, the central control unit 61 shifts to step SP117. If the rotation speed of the dehydration tank 2 is not 300 rpm or more, the process proceeds to step SP104.

<Step SP117>

In step SP117, the central control unit 61 determines the acceleration threshold value (mc) as the third acceleration threshold value (mc ₃ ). After that, the process proceeds to step SP118.

<Step SP118>

In step SP118, the central control unit 61 increases the rotation of the dehydration tank 2 to shift to step SP119.

<Step SP119>

In step SP119, the central control unit 61 determines whether the eccentric position (N) is in the middle or upper part of the dehydration tank 2 (eccentric position height determination). When the eccentric position (N) is in the middle upper part of the dehydration tank 2, the process proceeds to step SP120. When the eccentric position (N) is in the lower part of the dehydration tank 2, the process proceeds to step SP122.

<Step SP120>

In step SP120, the central control unit 61 determines the water injection possible upper limit rotation speed (Na) to the second water injection possible upper limit rotation speed (Na ₂ ), and proceeds to step SP121.

<Step SP121>

In step SP121, the central control unit 61 determines the eccentric amount threshold value (ma) as the third eccentricity amount threshold value (ma ₃ ), and proceeds to step SP124.

<Step SP122>

In step SP122, the central control unit 61 determines the water injection possible upper limit rotation speed (Na) to the first water injection possible upper limit rotation speed (Na ₁ ), and proceeds to step SP123.

<Step SP123>

In step SP123, the central control unit 61 determines the eccentric amount threshold value (ma) as the second eccentric amount threshold value (ma ₂ ), and proceeds to step SP124.

<Step SP124>

In step SP124, the central control unit 61 determines whether or not the rotation speed of the dehydration tank 2 is equal to or less than the water injection possible upper limit rotation speed (Na). When the rotation speed of the dehydration tank 2 is equal to or less than the upper limit rotation speed (Na) at which water can be injected, water injection can be performed and the process proceeds to step SP125. If the rotation speed of the dehydration tank 2 exceeds the upper limit rotation speed (Na) at which water can be injected, water injection cannot be performed and the water injection process is completed. In step SP124, when the eccentric position (N) is in the middle upper part of the dehydration tank 2, the second upper limit rotation speed (Na ₂ ) is used as the upper limit rotation speed (Na), and the eccentric position (Na) is used. When N) is in the lower part of the dehydration tank 2, the first upper limit rotation speed at which water can be injected (Na ₁ ) is used.

<Step SP125>

In step SP125, the central control unit 61 determines whether or not the eccentricity threshold (ma) is exceeded. When the eccentric amount (M) exceeds the eccentric amount threshold value (ma), the process proceeds to step SP126. When the eccentric amount (M) is less than the eccentric amount threshold value (ma), the water injection step is terminated. In step SP125, when the eccentric position (N) is in the middle upper part of the dehydration tank 2, the third eccentric amount threshold (ma ₃ ) is used as the eccentric amount threshold (ma), and the eccentric position (N) is used. Is located at the bottom of the dehydration tank 2, the second eccentricity threshold (ma ₂ ) is used.

<Step SP126>

In step SP126, the central control unit 61 performs a water injection process while maintaining the rotation speed of the dehydration tank 2 without increasing it. After that, the process proceeds to step SP127.

<Step SP127>

In step SP127, the central control unit 61 determines whether or not the eccentricity amount (M) exceeds the acceleration threshold value (mc). When the eccentricity amount (M) exceeds the acceleration threshold value (mc), the process proceeds to step SP126 and the water injection step is continued. When the eccentric amount (M) is below the acceleration threshold value (mc), the water injection step is terminated. In step SP127, a third acceleration threshold (mc ₃ ) is used as the acceleration threshold (mc).

Although the embodiment of the present invention has been described above, the configuration of the present embodiment is not limited to that described above, and various modifications are possible.

For example, in the above embodiment, the water receiving ring unit 5 is composed of three gutters 5a, 5b, and 5c, and three baffles 8 are provided correspondingly, but the present invention is not limited to this, and three or more baffles 8 are provided. It is sufficient that the number of gutters is the same as that of the baffle 8.

In the above embodiment, when the rotation speed of the dehydration tank 2 is larger than the resonance rotation speed, the same acceleration threshold value is set regardless of the eccentric position in the dehydration tank 2, but the rotation speed of the dehydration tank 2 resonates. In a state higher than the rotation speed, different acceleration thresholds may be set depending on whether the eccentric position is at the upper part of the dehydration tank 2 or at the center in the height direction and at the lower part of the dehydration tank 2. ..

In the above embodiment, when the rotation speed of the dehydration tank 2 is smaller than the resonance rotation speed, the same eccentricity threshold is set regardless of the eccentric position in the dehydration tank 2, but the rotation of the dehydration tank 2 In a state where the number is smaller than the resonance rotation speed, different eccentricity thresholds are set depending on whether the number is in the upper part of the dehydration tank 2 or in the center in the height direction and in the case where the eccentric position is in the lower part of the dehydration tank 2. Good.

In the above embodiment, when the rotation speed of the dehydration tank 2 is smaller than the resonance rotation speed, the acceleration threshold when the eccentric position in the dehydration tank 2 is above the dehydration tank 2 and the height direction of the dehydration tank 2 The acceleration thresholds when located in the center are the same, but they may be different.

In the above embodiment, when the rotation speed of the dehydration tank 2 is larger than the resonance rotation speed, the eccentricity threshold value when the eccentric position in the dehydration tank 2 is above the dehydration tank 2 and the height of the dehydration tank 2 The eccentricity thresholds are the same when they are in the central part in the longitudinal direction, but they may be different.

In the above embodiment, the eccentric position in the dehydration tank 2 is the upper limit rotation speed at which water can be injected when it is above the dehydration tank 2, and the upper limit rotation speed at which water can be injected when it is at the center in the height direction of the dehydration tank 2. They are the same, but they may be different.

In the above embodiment, the water receiving plate 85 is arranged in the baffle 8, and the water injection limit amount is limited by the length and position of the water receiving plate 85, but is not limited thereto. The baffle 8 may be one in which the water injection limit is not limited.

In the above embodiment, the acceleration threshold value, the upper limit rotation speed at which water can be injected, and the case where the eccentric position in the dehydration tank 2 is located at the upper part of the dehydration tank 2 or at the center in the height direction and at the lower part of the dehydration tank 2 Although the eccentricity threshold is different, at least one of the acceleration threshold, the upper limit rotation speed at which water can be injected, and the eccentricity threshold may be different. Further, when the eccentric position is in the upper part of the dehydration tank or the central part in the height direction, the eccentric position is set to a threshold value other than the acceleration threshold value, the upper limit rotation speed at which water injection is possible, and the eccentricity amount threshold value used when water injection control is performed by the nozzle unit. It may be different from the case where it is located at the bottom of the dehydration tank.

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

1 Washing machine 2 Dewatering tub 2c Bottom of dewatering tub 3 Outer tub 4 Pulsator 5 Water receiving ring units 5a, 5b, 5c Water gutter 8 Baffle (water pipe part)
30 Nozzle unit 55 Proximity switch (position detection device)
56 Accelerometer (accelerometer)
60 Control unit (control means)
65 Unbalance amount detection unit (eccentricity detection means)
66 Unbalanced position detection unit (eccentricity detection means)
80 Circulating water outlet

Claims (5)

A dehydration tank that is placed inside the outer tank and has a pulsator at the bottom,
Three or more water pipes that are arranged at equal intervals in the circumferential direction with respect to the inner peripheral surface of the dehydration tank and that are open near the bottom and have a circulating water port at the upper end.
A water receiving ring unit fixed to the upper end of the dehydration tank and having three or more annular water gutters connected to the upper end of the water pipe portion in a radial direction.
A nozzle unit fixed to the upper end of the outer tank and capable of individually injecting adjusted water into each gutter.
Acceleration detecting means for detecting vibration of the outer tank and
A position detection device that emits a pulse signal according to the rotation of the dehydration tank, and
An eccentricity detecting means for detecting the amount of eccentricity and the eccentricity position in the dehydration tank,
In the dehydration step, when the eccentric amount reaches a predetermined eccentric amount threshold value, a control means for controlling the nozzle unit so as to inject water into the water pipe portion corresponding to the eccentric position is provided.
The control means has a case where the eccentric position detected by the eccentricity detecting means is in the upper part of the dehydration tank or a central portion in the height direction with respect to the nozzle unit, and a case where the control means is in the lower part of the dehydration tank. A washing machine characterized by different controls. In the dehydration step, the control means starts controlling the nozzle unit so as to inject water into the water pipe portion, and then the amount of eccentricity detected by the eccentricity detecting means becomes equal to or less than a predetermined acceleration threshold value. In this case, the nozzle unit is controlled so as to stop the injection of water into the water pipe portion.
The acceleration threshold value when the eccentric position is in the upper part or the central portion in the height direction of the dehydration tank is smaller than the acceleration threshold value when the eccentric position is in the lower part of the dehydration tank. The washing machine according to claim 1. The eccentricity threshold when the eccentric position is at the upper part of the dehydration tank or at the center in the height direction is smaller than the eccentricity threshold when the eccentric position is at the lower part of the dehydration tank. The washing machine according to claim 1 or 2. In the dehydration step, the control means controls the nozzle unit so as to inject water into the water pipe portion corresponding to the eccentric position only when the rotation speed of the dehydration tank is equal to or less than a predetermined upper limit rotation speed at which water can be injected. It is a thing
The water injection upper limit rotation speed when the eccentric position is at the upper part of the dehydration tank or the central portion in the height direction is larger than the water injection possible upper limit rotation speed when the eccentric position is at the lower part of the dehydration tank. The washing machine according to any one of claims 1 to 3, wherein the washing machine is small. When the water injection limit amount that can be injected into the water pipe portion changes according to the rotation speed of the dehydration tank,
The control means is characterized in that, in the dehydration step, the nozzle unit is controlled so that the amount of water injected into the water pipe portion does not exceed the water injection limit amount according to the rotation speed of the dehydration tank. The washing machine according to any one of 1 to 4.

Images