JP2011217761A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine capable of shortening the time required for a washing step.SOLUTION: A control device 6 detects outer tub displacement Sx that is displacement of an outer tub 2 based on acceleration generated in an x-axis direction when the outer tub 2 vibrates in response to rotation of a washing and dewatering tub 3. If the outer tub displacement Sx is a third threshold Sc or larger, the control device 6 removes water contained in laundry keeping rotation speed of the washing and dewatering tub 3 at a reference rotation speed. If the outer tub displacement Sx is smaller than the third threshold Sc, the control device 6 removes water contained in laundry by increasing in stages the rotation speed of the washing and dewatering tub 3 from the reference rotation speed. The control device 6 keeps the outer tub displacement Sx to be smaller than the third threshold Sc, and begins high-speed dewatering operation to increase the rotation speed of the washing and dewatering tub 3 to a predetermined high rotation speed when the rotation speed of the washing and dewatering tub 3 has reached a second reference rotation speed.

Description

  The present invention relates to a washing machine capable of executing a dehydration process for dehydrating laundry.

The washing machine includes an outer tub elastically supported by the casing and an inner tub rotatably supported therein, and the laundry is washed, rinsed and dehydrated in the inner tub.
This inner tank is rotationally driven by a driving means attached to the outer tank.

  Of the washing steps (washing step, rinsing step, dehydration step, drying step) in the washing machine, the dehydration step is operated (high-speed dehydration operation) so as to increase the rotation speed of the inner tub to a predetermined high-speed rotation speed. When the laundry is biased in the inner tub, there is a problem that a large vibration or noise is generated by resonance before the rotation speed of the inner tub reaches a predetermined high speed.

  In order to solve such a problem, for example, in Patent Document 1, it is detected that the laundry in the drum is biased based on the rotation unevenness of the drum (inner tub), and the resonance is solved by eliminating this bias. A technique for reducing vibration is disclosed.

JP 2003-326093 A

For example, according to the technique disclosed in Patent Document 1, when the rotation unevenness of the drum (inner tub) is large, an operation of temporarily stopping the rotation of the drum and eliminating the unevenness of the laundry is executed.
Therefore, even if the drum can be rotated at a high rotational speed by removing a part of the moisture contained in the laundry by rotating the drum for a predetermined time, the dehydration process is interrupted by temporarily stopping the rotation of the drum. For this reason, there is a problem that the time required for the dehydration process becomes longer, and consequently the time required for the washing process becomes longer.

  Then, this invention makes it a subject to provide the washing machine which can shorten the time which a washing process requires.

  In order to solve the above-mentioned problems, the present invention provides a washing machine in which the dehydration process is not interrupted by rotating the inner tub at a low speed to remove moisture from the laundry.

  ADVANTAGE OF THE INVENTION According to this invention, the washing machine which can shorten the time which a washing process requires can be provided.

It is a perspective view which shows the washing machine which concerns on this embodiment. It is sectional drawing which shows the inside of the washing machine which concerns on this embodiment. It is a block diagram which shows the functional block of the washing machine which concerns on this embodiment. It is a figure which shows the imbalance of a laundry. It is a flowchart which shows a dehydration process. It is a flowchart which shows a water draining process. It is a figure which shows the relationship between outer tank left-right direction displacement and the frequency | count of calculation. It is a figure which shows the change of the rotational speed of a washing and dewatering tank. It is sectional drawing which shows the inside of a vertical washing machine.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1, the washing machine 1 according to the present embodiment continuously performs each process of a washing process, a rinsing process, a dehydrating process, and a drying process as a washing process for washing laundry (select as needed). ) To wash and dry the laundry, a so-called drum-type washing and drying machine, on the front surface of the casing 1a supported by the base 15 having the leg 16 in contact with the floor such as a laundry pan (not shown) A door 7 is provided for taking in and out things.
In addition, the washing machine 1 sets the left-right direction as the front (front) side of the door 7 and the front direction from the back (rear) with respect to the front.
And the coordinate axis which sets the left-right direction of the washing machine 1 as the X-axis, the front-back direction as the Y-axis, and the up-down direction as the Z-axis is set.

The door 7 is configured to open and close by operating the open / close button 8, and an operation panel 9, a detergent tray 10, a display panel 11, and the like are provided on the upper portion of the door 7. The operation panel 9 is a panel provided with operation buttons (not shown) for the user to operate the washing machine 1, and the detergent tray 10 is a tray for the user to put detergent into the washing machine 1.
The display panel 11 is display means for displaying the operating state of the washing machine 1, the contents set by the user, and errors that occur in the washing machine 1.

  In addition, the code | symbol 12 is a dry filter panel which collects the cotton dust which generate | occur | produces in a drying process, the code | symbol 13 is a handle part used when carrying the washing machine 1, etc., and the code | symbol 14 collected in the inside of the housing | casing 1a. A drain hose for draining water, reference numeral 17, is a filter panel that houses a filter that collects dust such as yarn waste generated in a cleaning process or the like.

As shown in FIG. 2, the inside of the housing 1a is supported below by a suspension 22 configured to be movable up and down, and suspended springs 18 and 19 serving as elastic supports from above the housing 1a. The outer tub 2 that is elastically supported by is provided.
With this configuration, the outer tub 2 is elastically supported by the housing 1a.
The outer tub 2 is configured in a cylindrical shape with an opening on the front side, and a washing and dehydrating tub 3 is provided therein as an inner tub into which laundry is put. The washing and dewatering tub 3 is rotatably supported around the rotation axis θS by a driving means 4 attached to the bottom of the outer tub 2, and the washing process and the rinsing process in the washing machine 1 are performed by the rotation of the washing and dehydrating tub 3. Then, a dehydration step and the like are performed.

  The outer tub 2 and the washing and dewatering tub 3 of the washing machine 1 which is a drum type washing and drying machine are provided with an appropriate inclination with respect to the floor surface so that the front side is raised. With this structure, the user can easily put the laundry into the washing and dewatering tub 3.

The outer tub 2 is configured to accumulate water during a process using water such as a cleaning process and a rinsing process, and a drain hose 14 is connected via a drain valve 21. When the drain valve 21 is opened, the water accumulated in the outer tub 2 flows through the drain hose 14 and is drained.
Reference numeral 51 denotes an acceleration sensor (three-axis acceleration sensor) that detects acceleration generated in the outer tub 2, and constitutes a displacement detection means 5 (see FIG. 3) described later. Details of the three-axis acceleration sensor 51 will be described later.

The washing machine 1 configured as described above is controlled by the control device 6.
The control device 6 controls the washing machine 1 by controlling the rotational speed of the driving means 4, opening / closing the drain valve 21, opening / closing a water tap (not shown) that supplies water to the outer tub 2.

  As shown in FIG. 3, the control device 6 controls the washing machine 1 by the microcomputer 60 executing a program stored in a memory (not shown). The motor control circuit 54 of the control device 6 is a circuit for generating a drive current to be supplied to the motor 53 provided in the drive means 4, and the microcomputer 60 gives a command to the motor control circuit 54, so that the washing and dewatering tub 3 (FIG. 2). (See) is supplied to the motor 53 for rotation at a predetermined rotation speed. Further, the control device 6 is configured so that the rotation speed of the motor 53 is fed back from the rotation speed detection means 70 of the drive means 4. The control device 6 accurately rotates the rotation speed of the washing and dewatering tub 3 by feedback control. Can be controlled.

  The displacement detection means 5 is provided for detecting vibration of the outer tub 2 (see FIG. 2), and includes a triaxial acceleration sensor 51, a filter circuit 52, a microcomputer 60, and the like. The triaxial acceleration sensor 51 is an acceleration sensor that detects acceleration generated in the outer tub 2, and is configured to be able to detect, for example, acceleration generated in each of the X-axis, Y-axis, and Z-axis directions of the outer tub 2. .

The triaxial acceleration sensor 51 is not limited. For example, an acceleration in the X-axis direction, an acceleration in the Y-axis direction, and an acceleration in the Z-axis direction are detected individually, and a voltage value of 0.66 V with respect to the acceleration of 1 G (≈9.8 m / S ² ) in each direction. Is known as a detection signal, but this can also be applied.

  The display panel circuit 55 is a circuit for driving the display panel 11. When displaying predetermined information on the display panel 11, the microcomputer 60 gives a command to the display panel circuit 55, and inputs information to be displayed from the display panel circuit 55 to the display panel 11 as a control signal. Display information.

The filter circuit 52 includes a low-pass filter, for example, and is a circuit that removes a noise component of a signal input from the triaxial acceleration sensor 51 and inputs the signal to the microcomputer 60.
The power supply circuit 57 is a circuit that converts electric power taken from an external power supply such as an AC power supply 56 into driving power for the control device 6 and supplies the electric power to electronic components and the like that constitute the control device 6.
Further, the control device 6 is configured to be able to control the opening and closing of the drain valve 21 by transmitting a control signal to the drain valve 21 (see FIG. 2).

  The control device 6 configured as described above includes, as a standard washing process, a washing process for washing laundry, a rinsing process for washing laundry containing dirty washing water, a dehydration process for dehydrating laundry, and Each step of the drying step for drying the laundry is executed.

Among the washing steps of the washing machine 1, in the dehydration step, the moisture contained in the laundry is dehydrated by centrifugal force, so that the rotation speed of the washing and dehydration tub 3 is increased by a high-speed rotation speed ( For example, it is increased to 1600 rpm.
Hereinafter, the high speed rotation speed of the washing and dewatering tub 3 during the high speed dewatering operation is referred to as a dewatering rotation speed.

  However, at the stage where the rinsing process is completed, the laundry is in a heavy state containing a large amount of moisture, and is also arranged in an unbalanced state (unbalanced) in the washing and dewatering tub 3 as shown in FIG. Often. Furthermore, as shown in FIG. 4, the state where the laundry is biased with respect to the rotation axis θS of the washing / dehydrating tub 3 is a mass unbalanced state in which the mass is biased in the washing / dehydrating tub 3, When the dehydration operation is started, large vibrations and noises are generated in the outer tub 2 and the washing / dehydration tub 3 when the rotation speed of the washing / dehydration tub 3 is increased to the dehydration rotation speed.

This is a rotational speed (hereinafter referred to as primary resonance rotation) that generates resonance (primary resonance) in the washing / dehydration tank 3 and the outer tank 2 until the rotation speed of the washing / dehydration tank 3 reaches the dehydration rotation speed. By passing through). That is, primary resonance occurs in the washing / dehydrating tub 3 and the outer tub 2 when the rotational speed of the washing / dehydrating tub 3 is the primary resonance rotational speed.
When primary resonance occurs, the washing / dehydrating tub 3 and the outer tub 2 vibrate mainly in the left-right direction, causing large vibration and noise.
And when the bias of the laundry in the washing / dehydrating tub 3 is large, since the large vibration is generated in the washing / dehydrating tub 3, the vibration of the washing / dehydrating tub 3 and the outer tub 2 due to the primary resonance is increased, Vibration and noise generated in the washing machine 1 are increased.

Therefore, in order to reduce the vibration generated in the washing / dehydrating tub 3 and the outer tub 2 when the rotational speed of the washing / dehydrating tub 3 is the primary resonance rotational speed, the unevenness of the laundry (mass bias) is eliminated. It is preferable.
Conventionally, after the rinsing process is completed, the control device 6 opens the drain valve 21 to drain the water in the outer tub 2 and then repeatedly rotates the washing and dewatering tub 3 in the left-right direction at a low speed. When the washing / dehydrating tub 3 is repeatedly rotated at a low speed in the left-right direction, the laundry in the washing / dehydrating tub 3 is rearranged and appropriately dispersed around the rotation axis θS, thereby eliminating the unevenness of the laundry.
The process of eliminating the unevenness of the laundry is referred to as a rearrangement process.

  However, since the rearrangement process is a process of repeatedly rotating the washing and dewatering tub 3 in the left-right direction at a low speed, when the rearrangement process is performed after the rinsing process is completed, the time until the dehydration process is performed becomes longer. As a result, the time required for the washing process of the washing machine 1 becomes longer.

  In addition, for example, when there is one laundry, there is no other laundry to be placed on the laundry and the target, and thus the unevenness of the laundry cannot be suitably eliminated even if the rearrangement process is executed. In particular, in the case where there is one piece of laundry that is likely to contain a large amount of water, such as a bath mat, since the laundry is heavy and contains a large amount of water in the rinsing process, the washing and dehydrating tub 3 is on the side where the laundry is arranged. The mass is greatly biased, and the vibration of the washing / dehydrating tub 3 and the outer tub 2 generated when the rotation speed of the washing / dehydrating tub 3 reaches the primary resonance rotation speed becomes large.

Then, the control apparatus 6 which concerns on this embodiment performs the draining process which removes a water | moisture content from laundry as much as possible by the low speed rotation of the washing and dewatering tank 3 as needed at the time of the start of a dehydration process.
The vibrations of the washing / dehydrating tub 3 and the outer tub 2 that occur when the rotational speed of the washing / dehydrating tub 3 is the primary resonance rotational speed cause the unevenness of the laundry around the rotation axis θS, that is, the mass non-uniformity due to the unevenness of the mass. A vibration (hereinafter referred to as unbalance vibration) generated in the washing / dehydrating tub 3 in balance is transmitted to the outer tub 2 and generated.

Further, the magnitude of the unbalance vibration is determined by the amount of mass deviation in the washing and dewatering tub 3, and the mass deviation amount is regarded as the total weight of the laundry, that is, the weight of the laundry and the amount of moisture contained therein. Can do. When the moisture contained in the laundry is removed, the weight of the laundry is reduced, so that the mass imbalance in the washing and dewatering tub 3 is eliminated and unbalance vibration can be reduced. Vibration generated in the water tank 3 and the outer tank 2 can be reduced.
Therefore, in the washing machine 1 according to this embodiment, when the dehydration process is started, the water drainage process is performed as necessary to remove moisture contained in the laundry, and the mass of the washing and dehydration tub 3 is reduced. Configured to eliminate the balance.

Then, the control device 6 monitors the state in which the unbalance vibration is reduced during the water draining process, and when the unbalance vibration is suitably reduced, the controller 6 increases the rotational speed of the washing / dehydrating tub 3 to the dehydration rotational speed. Start dehydration operation.
Further, the control device 6 according to the present embodiment detects unbalance vibration based on the acceleration generated in the outer tub 2.

  As described above, the three-axis acceleration sensor 51 is configured to detect and control the acceleration in the three-axis directions (X-axis direction, Y-axis direction, and Z-axis direction) generated in the outer tub 2 (see FIG. 2). The apparatus 6 is configured to detect unbalance vibration generated in the washing and dewatering tub 3 (see FIG. 2) based on the acceleration in the three-axis direction of the outer tub 2 detected by the three-axis acceleration sensor 51. . Then, when the unbalance vibration generated in the washing / dehydrating tub 3 is smaller than a predetermined value in the water draining process executed at the start of the dehydrating process, the control device 6 suitably removes moisture from the laundry. It is determined that the laundry bias (mass bias) has been eliminated.

  Moreover, the control apparatus 6 which concerns on this embodiment detects the unbalance vibration which generate | occur | produces in the washing and dehydrating tank 3 based on the acceleration of the X-axis direction generate | occur | produced in the outer tank 2 (refer FIG. 2).

  The unbalance vibration is a vibration generated due to a shake of rotation when the washing and dewatering tub 3 (see FIG. 2) rotates around the rotation axis θS (see FIG. 2), and the unbalance vibration is generated in the outer tub 2 (see FIG. 2). 2), the control device 6 (see FIG. 2) can detect the unbalanced vibration based on the acceleration generated in the outer tub 2. For this reason, in the present embodiment, the triaxial acceleration generated in the outer tub 2 is detected by the triaxial acceleration sensor 51 (see FIG. 3), and the control device 6 unloads based on the detected triaxial acceleration. Detect balance vibration.

In addition, as described above, since the outer tank 2 (see FIG. 2) vibrates in the left-right direction (X-axis direction), the primary resonance is reduced in order to reduce vibration and noise generated by the primary resonance. It is preferable to reduce the component in the X-axis direction of vibration generated in the tank 2.
Therefore, the present embodiment is suitable from the laundry when the control device 6 (see FIG. 2) detects the unbalance vibration detected based on the acceleration in the X-axis direction generated in the outer tub 2 smaller than a predetermined value. It is determined that the moisture is removed and the unevenness of the laundry (the unevenness of the mass) is resolved.

With reference to FIG. 5, the procedure in which the control apparatus 6 performs a spin-drying | dehydration process is demonstrated (refer FIGS. 1-4 suitably).
When starting the dehydration process, the control device 6 executes data initialization (step S1). The control device 6 initializes a counter variable M that counts the number of executions of the water draining process by data initialization (M = 0). Then, the control device 6 increases the rotational speed of the washing and dewatering tub 3 to a predetermined rotational speed (step S2), and the X of the outer tub 2 is determined based on the acceleration in the X-axis direction detected by the triaxial acceleration sensor 51. An axial displacement (outer tank displacement) is calculated (step S3).
Hereinafter, the outer tub displacement is indicated by a symbol Sx. Moreover, when an outer tank displacement is shown by Sxn, n shows the frequency | count that the control apparatus 6 calculated the outer tank displacement Sx.
Step S3 is a step of calculating an outer tub displacement Sx (initial displacement) first at the start of the water draining process, and a step of calculating an outer tub displacement Sx0 that is an initial displacement at the start of the water draining process.
Hereinafter, the outer tank displacement Sx0 that is the initial displacement is particularly referred to as the initial displacement Sx0.

  A predetermined rotation speed (hereinafter referred to as a reference rotation speed) when the control device 6 rotates the washing / dehydrating tub 3 in step S2 is not a limited value, but temporarily oscillates in the washing / dehydrating tub 3 and the outer tub 2. A low rotation speed that does not lead to breakage even if the occurrence of spillage occurs is preferable, and a rotation speed lower than the primary resonance rotation speed unique to the washing machine 1 is preferable. Incidentally, in the washing machine 1 which concerns on this embodiment, since it was confirmed that 160 rpm is a primary resonance rotational speed, the reference | standard rotational speed was set to 110 rpm.

The outer tank displacement Sxn can be calculated by the following equation (1) based on the acceleration in the X-axis direction.
_{Sxn = (Vx p-p ×} K) / (2πN / 60) 2 ··· (1)
In Expression (1), Vx _pp is the output voltage at which the triaxial acceleration sensor 51 constituting the displacement detecting means 5 detects the acceleration in the X axis direction, and K is the acceleration in the X axis direction to the displacement in the X axis direction. A coefficient (fixed value) for conversion, N, is the rotational speed of the washing and dewatering tub 3.
Further, the output voltage _{Vx p-p} of the three-axis acceleration sensor 51, the difference between the maximum value and the minimum value of the output voltage Vx obtained for a predetermined time (e.g., 0.5 s) at a predetermined sampling period (e.g., 2 ms) It is.

The control device 6 thus calculates the initial displacement Sx0 by the equation (1) (step S3), and compares the calculated initial displacement Sx0 with the first threshold value Sa (step S4).
The first threshold value Sa is, for example, a threshold value (displacement amount) for determining the state of the washing / dehydrating tub 3 and the outer tub 2, and the control device 6 when the outer tub displacement Sx exceeds the first threshold value Sa. Determines that an abnormality has occurred in at least one of the washing and dewatering tub 3 or the outer tub 2. Such a first threshold value Sa is an eigenvalue obtained by experimental measurement or the like.

  When the initial displacement Sx0 is equal to or greater than the first threshold value Sa (step S4 → No), the control device 6 determines that an abnormality has occurred in at least one of the washing / dehydrating tub 3 or the outer tub 2 and stops the dehydration process. (Step S5) Further, an error is displayed on the display panel 11 (Step S6).

  On the other hand, when the initial displacement Sx0 is smaller than the first threshold value Sa (step S4 → Yes), the control device 6 compares the initial displacement Sx0 with the second threshold value Sb (step S7). The second threshold value Sb is a value (displacement amount) smaller than the first threshold value Sa, and if the outer tub displacement Sx when the rotational speed N of the washing and dewatering tub 3 is the reference rotational speed is smaller than the second threshold value Sb, It is preferable to set the vibration and noise generated in the housing 1a when the primary resonance occurs in the washing / dehydrating tub 3 and the outer tub 2 so that it can be determined that the vibration and noise are below the allowable range. Such a second threshold value Sb is an eigenvalue obtained by experimental measurement or the like.

  Then, when the initial displacement Sx0 is smaller than the second threshold value Sb (step S7 → No), the control device 6 starts the high-speed dewatering operation (step S8).

  When the high-speed dehydration operation in step S8 is started, the control device 6 increases the rotation speed of the driving means 4 until the rotation speed N of the washing / dehydration tank 3 reaches the dehydration rotation speed (for example, 1600 rpm). The water contained in the laundry is dehydrated by centrifugal force by rotating at a high speed.

On the other hand, when the initial displacement Sx0 is equal to or greater than the second threshold value Sb (step S7 → Yes), the control device 6 is in a state where the laundry is biased and the mass deviation amount is large, and the rotational speed N of the washing and dewatering tub 3 is large. When the primary resonance rotational speed is reached and vibration is generated in the washing / dehydrating tub 3 and the outer tub 2, it is determined that there is a possibility that vibration and noise exceeding the allowable range may be generated in the housing 1a. Therefore, the control device 6 determines that it is necessary to perform the water draining process in order to remove the moisture contained in the laundry and eliminate the mass bias, and executes the water draining process (step S9).
The details of the draining process will be described later, but after the moisture contained in the laundry is lost in the draining process and the amount of mass deviation is reduced, the control device 6 starts the high-speed dewatering operation (step S8).
In addition, when the unevenness of mass cannot be suitably eliminated in the water draining process, the control device 6 executes the rearrangement process and returns to step S2.

With reference to FIG. 6, the procedure in which the control apparatus 6 performs a water draining process is demonstrated (refer FIGS. 1-4 suitably). In addition, when the control apparatus 6 starts the draining process, the washing and dewatering tub 3 is in a state of rotating at the reference rotation speed.
When starting the water draining process, the control device 6 compares the initial displacement Sx0 with the third threshold value Sc (step S900).
The third threshold value Sc is a value (displacement amount) that is larger than the second threshold value Sb and smaller than the first threshold value Sa. For example, the displacement of the outer tub 2 (amplitude) of the outer tub 2 that vibrates with the rotation of the washing / dehydrating tub 3. When the initial displacement Sx0 is equal to or greater than the third threshold value Sc, the control device 6 determines that the mass deviation is large and the mass deviation amount exceeds the allowable range.

  As described above, when the initial displacement Sx0 generated in the outer tub 2 when the rotational speed N of the washing / dehydrating tub 3 is the reference rotational speed is larger than the third threshold value Sc, the washing / dehydrating tub 3 is at the primary resonance rotational speed. Since the outer tub displacement Sx generated in the outer tub 2 when rotating exceeds the third threshold value Sc and further exceeds the first threshold value Sa, the control device 6 determines the rotational speed N of the washing and dewatering tub 3. It is determined that the rotation speed cannot be increased to the dehydration rotation speed.

Therefore, when the initial displacement Sx0 is equal to or greater than the third threshold value Sc (step S900 → Yes), the control device 6 supplies moisture contained in the laundry while maintaining the rotational speed N of the washing and dewatering tub 3 at the reference rotational speed. The 1st process of the draining process to remove is performed. Hereinafter, the first step of the water draining step is referred to as a water draining step A.
When the initial displacement Sx0 is greater than or equal to the third threshold value Sc (step S900 → Yes), the control device 6 monitors the change in the outer tub displacement Sx while maintaining the rotational speed N of the washing and dewatering tub 3 at the reference rotational speed. (Step S901).
For example, the control device 6 calculates the outer tank displacement Sxn over 50 seconds at intervals of 0.5 s.
In this case, the control device 6 calculates 100 outer tank displacements Sxn (Sx1 to Sx100). And the control apparatus 6 confirms increase / decrease in the outer tank displacement Sx from the value of the outer tank displacement Sx1 calculated after the initial displacement Sx0 and the last outer tank displacement Sx100.

  As shown in FIG. 7, it can be seen that the rate of change of the outer tank displacement Sx (the lateral displacement of the outer tank 2) decreases as the number of times of calculation of the outer tank displacement Sx increases. This indicates that the change in the mass of the laundry due to the removal of moisture becomes smaller with time, that is, the effect of draining becomes smaller. According to FIG. 7, when the outer tub displacement Sx is calculated 60 times or more, that is, when the controller 6 calculates the outer tub displacement Sx for 30 seconds or more, the outer tub displacement Sx is calculated and the laundry mass. The graph showing the relationship is almost horizontal, and it can be seen that the draining effect is small even if the washing and dewatering tub 3 is rotated for a longer time. Therefore, in this embodiment, the rotation speed N of the washing and dewatering tub 3 is maintained at the reference rotation speed for 30 seconds or more (for example, 50 seconds), and 100 outer tub displacements Sx (Sx1 to Sx100) are set. Configure to calculate.

  When the value obtained by subtracting the last outer tank displacement Sx100 from the outer tank displacement Sx1 calculated next to the initial displacement Sx0 is negative (step S902 → No), the control device 6 increases the outer tank displacement Sx, It is determined that even if the extraction process A is continued, the mass deviation is not eliminated. Therefore, the control device 6 ends the water draining process A and executes the rearrangement process (step S906).

  As described above, in the rearrangement step, after the control device 6 temporarily stops the rotation of the washing / dehydrating tub 3, the laundry / dehydrating tub 3 is repeatedly rotated in the left-right direction at a low speed to change the arrangement of the laundry. And after completion | finish of a rearrangement process, the control apparatus 6 returns a process to step S2 shown in FIG. 5, and performs a dehydration process again.

When the value obtained by subtracting the outer tank displacement Sx100 from the outer tank displacement Sx1 in step S902 is positive or zero (step S902 → Yes), the control device 6 determines that the outer tank displacement Sx is decreased or unchanged, and the last If outer tank displacement Sx100 is smaller than 3rd threshold value Sc (step S903-> No), a process will be advanced to step S910.
On the other hand, when the outer tank displacement Sx100 is greater than or equal to the third threshold value Sc (step S903 → Yes), the control device 6 adds 1 to the counter variable M (step S904), and the counter variable M is a predetermined number of times (for example, three times). If not reached (step S905 → No), the process returns to step S901. If the counter variable M has reached a predetermined number of times (for example, 3 times) (step S905 → Yes), the process proceeds to step S906. A rearrangement process is performed.

Steps S901 to S905 in the water draining process are water draining processes A for draining the laundry while maintaining the rotational speed N of the washing and dewatering tub 3 at the reference rotational speed, and the counter variable M is This is a variable for measuring the number of executions of the water draining step A. And the control apparatus 6 of this embodiment is comprised so that the rearrangement process may be performed when the outer tub displacement Sx does not become smaller than the third threshold value Sc even if the water draining process A is performed three times.
In addition, the frequency | count of execution of the draining process A is not limited to 3 times.

In the comparison between the initial displacement Sx0 and the third threshold value Sc, when the initial displacement Sx0 is smaller than the third threshold value Sc (step S900 → No), the control device 6 increases the rotational speed N of the washing and dewatering tub 3 from the reference rotational speed. The second step of the water draining step for removing moisture contained in the laundry while being lifted up is performed.
Hereinafter, the second step of the water draining step is referred to as a water draining step B.

When the initial displacement Sx0 is smaller than the third threshold value Sc (step S900 → No), the control device 6 increases the rotational speed N of the washing and dewatering tub 3 by one step (for example, 2 rpm) (step S910), and after the increase If the rotation speed N is equal to or higher than the predetermined rotation speed (step S911 → No), the high-speed dehydration operation is started (step S916).
In addition, step S910 is not limited to the structure which raises the rotational speed N of the washing and dewatering tank 3 by 2 rpm.
When the rotational speed N of the washing and dewatering tub 3 increases by one step and the outer tub displacement Sx increases, the increase amount of the outer tub displacement Sx can be suppressed so that the outer tub displacement Sx does not exceed the first threshold value Sa. As described above, it is preferable to set a one-stage rotation speed.

  When the rotational speed N of the washing and dewatering tub 3 is less than the predetermined rotational speed (step S911 → Yes), the control device 6 calculates the outer tub displacement Sx (step S912), and further calculates the outer tub displacement Sx. Is compared with the third threshold value Sc (step S913).

The predetermined rotation speed that the control device 6 compares with the rotation speed N of the washing / dehydrating tub 3 in step S911 is the rotation speed of the washing / dehydrating tub 3 when the outer tub displacement Sx reaches the peak, such as experimental measurement. Is the characteristic value of the washing machine 1 obtained by
Hereinafter, such a rotational speed is referred to as a second reference rotational speed.

That is, if the outer tub displacement Sx when the rotational speed N of the washing / dehydrating tub 3 is the second reference rotational speed is smaller than the third threshold value Sc, the control device 6 makes the washing / dehydrating tub 3 the primary resonance rotational speed. It is determined that the outer tank displacement Sx at the time of rotation can be suppressed to be smaller than the third threshold value Sc, and as a result, the outer tank displacement Sx can be suppressed to be smaller than the first threshold value Sa. The second reference rotation speed is preferably higher than the above-described reference rotation speed (110 rpm) and lower than the high-speed rotation speed (1600 rpm) of the washing and dewatering tub 3 during the high-speed dewatering operation.
In the washing machine 1 according to the present embodiment, 150 rpm, which is lower than the primary resonance rotation speed of 160 rpm, is set as the second reference rotation speed. Therefore, in this embodiment, when the rotational speed N of the washing and dewatering tub 3 is less than 150 rpm (step S911 → Yes), the control device 6 advances the processing to step S912 and step S913.

  And the control apparatus 6 returns a process to step S910, when the outer tank displacement Sx calculated by step S912 is less than 3rd threshold value Sc (step S913-> No), and the outer tank displacement Sx is more than 3rd threshold value Sc. When (step S913 → Yes), the current rotational speed N is maintained for 0.5 seconds (step S914).

After maintaining the rotational speed N of the washing and dewatering tub 3 for 0.5 seconds, the control device 6 performs the process if 50 seconds have not elapsed since the start of the water draining process B (step S915 → No). Although it returns to step S912, if 50 seconds have passed since the draining process B was started (step S915-> Yes), a rearrangement process will be performed (step S917).
Note that the rearrangement step in step S917 is the same as the rearrangement step in step S906.

  Further, the high-speed dehydration operation in step S916 is the high-speed dehydration operation in step S8 in FIG. That is, when the rotational speed N of the washing and dewatering tub 3 reaches 150 rpm in Step S911 in FIG. 6 (Step S911 → No), the control device 6 advances the procedure to Step S8 shown in FIG.

  The process from step S910 to step S915 in the draining process shown in FIG. 6 is a draining process B in which the rotational speed N of the washing and dewatering tub 3 is increased stepwise to drain the laundry. And the washing machine 1 (refer FIG. 1) which concerns on this embodiment has the draining process containing two processes, the draining process A and the draining process B, as shown in FIG.

  For example, even when the outer tank displacement Sx, which is the amount of displacement in the left-right direction of the outer tank 2 (see FIG. 2), is larger than the second threshold value Sb and high-speed dewatering operation is impossible, the outer tank displacement Sx is the third. If it is smaller than the threshold value Sc, the control device 6 can increase the rotational speed N of the washing and dewatering tub 3 (see FIG. 2) stepwise by executing the water draining step B, and the outer tub displacement Sx is When the state smaller than the third threshold value Sc is maintained, the high speed dewatering operation can be started without stopping the rotation of the washing and dewatering tank 3.

  Further, even if the outer tub displacement Sx is larger than the third threshold value Sc, if it is equal to or less than the first threshold value Sa, the control device 6 (see FIG. 2) performs the draining process A, thereby washing and unloading. The change of the outer tub displacement Sx can be monitored while removing moisture contained in the laundry in a state where the rotation speed N of the water tub 3 (see FIG. 2) is maintained at the reference rotation speed. And when outer tank displacement Sx becomes smaller than 3rd threshold value Sc, the control apparatus 6 can perform the draining process B, and can raise the rotational speed N of the washing and dewatering tank 3 in steps.

  FIG. 8 shows the change in the rotation speed of the washing / dehydrating tub 3 (see FIG. 2) when the speed is lower than the reference rotation speed, and the change in the rotation speed of the washing / dehydrating tub 3 when the water draining step A is executed. Change in rotation speed of the washing / dehydrating tub 3 when executing the one-dot chain line and the water draining process B is indicated by a solid line, and change in rotation speed of the washing / dehydrating tub 3 during the high-speed dewatering operation is indicated by a two-dot chain line. The change in the rotational speed of the washing and dewatering tub 3 when doing this is indicated by a thin broken line.

  As shown in FIG. 8, the control device 6 (see FIG. 2) sets the rotational speed of the washing and dewatering tub 3 (see FIG. 2) to the primary resonance rotational speed (see FIG. 2) in the dehydration process of the washing machine 1 (see FIG. 1). The outer tub displacement Sx generated in the outer tub 2 (see FIG. 2) is calculated while removing moisture contained in the laundry while maintaining the reference rotational speed (110 rpm) lower than 160 rpm. And if outer tank displacement Sx is smaller than 3rd threshold value Sc, the control apparatus 6 will perform the draining process B, will raise the rotational speed N of the washing and dewatering tank 3 in steps, and will be 2nd reference | standard rotational speed. If the rotation speed can be increased to (150 rpm), the outer tank displacement Sx generated in the outer tank 2 when the rotation speed N of the washing and dewatering tank 3 is the primary resonance rotation speed can be suppressed to be smaller than the first threshold value Sa. Determine and start high-speed dewatering operation.

  On the other hand, even when the outer tub displacement Sx when the rotational speed N of the washing and dewatering tub 3 (see FIG. 2) is the reference rotational speed is greater than the third threshold value Sc, the outer tub displacement Sx is greater than the first threshold value Sa. If it is smaller, the control device 6 executes the water draining process A, removes moisture contained in the laundry while maintaining the rotational speed N of the washing and dewatering tub 3 at the reference rotational speed, and the outer tub displacement Sx is the first. When it becomes smaller than 3 threshold value Sc, the draining process B is performed and the rotational speed N of the washing and dewatering tub 3 is increased stepwise.

  As shown in FIG. 8, both the draining step A and the draining step B remove moisture contained in the laundry without stopping the rotation of the washing and dewatering tub 3 (see FIG. 2), When the unevenness of the mass is eliminated and the rotation of the washing and dewatering tub 3 is stopped, the rotation speed N can be increased and the high speed dewatering operation can be started. Therefore, the rotation speed N of the washing and dewatering tub 3 can be quickly increased to the high speed (1600 rpm) during the high speed dewatering operation.

As described above, the washing machine 1 (see FIG. 1) according to the present embodiment performs washing and detaching when the outer tub displacement Sx is equal to or larger than the second threshold value Sb and is smaller than the first threshold value Sa at the time of performing the dehydration process. The water draining step can be executed while maintaining the rotation speed N of the water tank 3 at the reference rotation speed. Furthermore, if the outer tub displacement Sx is equal to or less than the third threshold value Sc, the water draining process can be executed while gradually increasing the rotational speed N of the washing and dewatering tub 3.
Then, when the controller 6 determines that the moisture contained in the laundry has been removed by the draining process and the amount of mass deviation has decreased, the dewatering tank 3 does not stop rotating and the high-speed dewatering is stopped. You can start driving.
As a result, it is possible to avoid the execution of the rearrangement process for temporarily stopping the rotation of the washing and dewatering tub 3 as much as possible, and the time from the start of the dewatering process to the start of the high speed dewatering operation can be reduced. Can be shortened. Furthermore, the rotation speed N of the washing and dewatering tub 3 can be quickly increased to the high speed rotation speed during the high speed dewatering operation, and an excellent effect is achieved that the time required for the washing process can be shortened.

The third threshold value Sc is a value obtained by experimental measurement or the like, but the third threshold value Sc may be configured to be changeable.
As shown in step S900 and step S913 of FIG. 6, when the third threshold value Sc becomes small, the water draining process A and the rearrangement process are executed with a small outer tub displacement Sx, that is, with a small mass deviation amount.
That is, the control device 6 (see FIG. 2) controls the washing machine 1 (see FIG. 1) so as to eliminate the mass deviation even when the mass deviation amount is small.

Accordingly, the rotational speed N of the washing / dehydrating tub 3 reaches the primary resonance rotational speed with a small mass deviation, and the washing / dehydrating tub 3 (see FIG. 2) and the outer tub 2 (by the primary resonance) ( The vibration of FIG. 2) becomes small and the vibration and noise which generate | occur | produce in the housing | casing 1a (refer FIG. 2) are reduced.
However, the rearrangement process is executed with a small mass deviation, and the frequency until the start of the high-speed dehydration operation becomes longer due to the execution of the rearrangement process. If the time until the start of the high-speed dehydration operation becomes longer during the dehydration process, the time required for the dehydration process becomes longer, and consequently the time required for the washing process becomes longer.

As described above, when the third threshold value Sc is reduced, vibration and noise when the primary resonance occurs can be reduced, but the frequency until the start of the high-speed dehydration operation is increased during the dehydration process, that is, required for the washing process. The frequency of time increases.
On the other hand, when the third threshold value Sc increases, vibration and noise when primary resonance occurs may increase, but the frequency until the start of the high-speed dehydration operation during the dehydration process is increased, that is, washing The frequency with which the time required for the process becomes longer decreases. In other words, the frequency with which laundry is quickly completed is increased.

  Therefore, for example, a configuration in which the user can select either a setting (setting A) that reduces vibration or noise when primary resonance occurs or a setting (setting B) that quickly increases the frequency at which washing is completed. In addition, when the user selects setting A, the control device 6 changes the setting of the third threshold value Sc to a small value, and when the user selects setting B, the control device 6 changes the setting value of the third threshold value Sc to a large value. If it is set as a structure, a user can use the washing machine 1 (refer FIG. 1) by a preference setting, and the convenience improves.

  As described above, when the user can select the setting A and the setting B, if the operation panel 9 (see FIG. 1) of the washing machine 1 is provided with a selection button for the setting A and the setting B, the user can Setting A and setting B can be easily selected. Alternatively, the operation panel 9 is configured to include a selector switch that can be set stepwise or steplessly between the setting A and the setting B, and the control device 6 (see FIG. 2) is configured according to the position of the selector switch. If the threshold value Sc is set, the user can select a favorite state between the setting A and the setting B, and the selection range of the user can be expanded. In this case, the control device 6 decreases the third threshold value Sc as it is closer to the setting A, and increases the third threshold value Sc as it is closer to the setting B.

The above description is based on the washing machine 1 of the drum type washing and drying machine shown in FIG. 1, but this embodiment can also be applied to the vertical washing machine 80 shown in FIG. 9. As shown in FIG. 9, in the vertical washing machine 80, a substantially cylindrical outer tub 82 is elastically supported so that an upper portion is opened inside a casing 81 provided with an opening / closing lid 87. A washing and dewatering tub 83 that is rotationally driven by a motor 90 is provided inside.
In addition, the lower part (bottom part) of the washing / dehydrating tub 83 is provided with a stirring blade 86 that is rotated by a motor 90, and a vortex is generated in the water accumulated in the outer tub 82 and the washing / dehydrating tub 83 is charged. It is configured to wash things. Further, a control panel 89 including an operation unit and a display unit is provided on the front side of the vertical washing machine 80. The vertical washing machine 80 is controlled by the control device 92.

  In the vertical washing machine 80 configured as described above, in the high-speed dehydration operation in the dehydration process, the rotation speed N of the washing and dewatering tub 83 is increased to a predetermined high-speed rotation speed (for example, 1000 rpm). Similar to the illustrated washing machine 1 (drum type washing and drying machine), it is necessary to eliminate the unevenness of the laundry (the unevenness of the mass) as necessary. Therefore, the outer tank 82 may be provided with a displacement detection means (three-axis acceleration sensor 93), and the control device 92 may be configured to calculate the unbalanced vibration generated in the outer tank 82 based on the displacement of the outer tank 82. .

  For example, in the case of the vertical washing machine 80 on the coordinates where the front-rear direction is the Y-axis, the up-down direction is the Z-axis, the left-right direction, that is, the direction perpendicular to the Y-axis and the Z-axis is the X-axis, The tank 82 may be configured to calculate the displacement of the washing and dewatering tank 83 based on the acceleration generated in the X-axis direction. If the control device 92 is configured to execute the water draining process A and / or the water draining process B shown in FIG. 6 according to the calculated displacement, the washing machine 1 (drum type washing dryer) shown in FIG. ) Can be obtained.

DESCRIPTION OF SYMBOLS 1 Washing machine 1a Case 2 Outer tub 3 Washing / dehydration tub (inner tub)
Reference Signs List 4 Drive means 5 Displacement detection means 6 Control device 18, 19 Hanging spring 51 3-axis acceleration sensor (acceleration sensor)

Claims (6)

An outer tub elastically supported inside the housing;
An inner tub rotatably provided inside the outer tub, and driven to rotate by a driving means;
A displacement detecting means for detecting a displacement of the outer tub that vibrates with the rotation of the inner tub;
A control device,
At the start of a dehydration step of dehydrating laundry by increasing the rotational speed of the inner tub to a predetermined high speed, the inner tub is rotated at a rotational speed lower than the predetermined high speed. A washing machine that executes a draining process for removing moisture contained in the laundry,
The draining step is
A first step of removing moisture from the laundry while maintaining the rotation speed of the inner tub at a predetermined reference rotation speed;
A second step of removing water from the laundry by gradually increasing the rotational speed of the inner tub from the reference rotational speed,
The controller is
In the case where the initial displacement, which is the displacement of the outer tub when the inner tub is rotated at the reference rotation speed at the start of the dehydration step, is smaller than a predetermined first threshold and not less than a predetermined second threshold,
Executing the first step when the initial displacement is greater than or equal to a third threshold set between the first threshold and the second threshold;
The washing machine, wherein the second step is executed when the initial displacement is smaller than the third threshold value. The controller is
During the second step, when the displacement of the outer tub becomes equal to or greater than the third threshold as the rotational speed of the inner tub rises, the laundry is rearranged in the inner tub. Execute the process,
While executing the second step, a second reference in which the rotation speed of the inner tank is higher than the reference rotation speed and lower than the high-speed rotation speed while maintaining the displacement of the outer tank smaller than the third threshold value. The washing machine according to claim 1, wherein when the rotational speed is reached, the high-speed dewatering operation is started. The controller is
The washing machine according to claim 1 or 2, wherein the second step is executed when the displacement of the outer tub becomes smaller than the third threshold value during the first step. The controller is
When the initial displacement is greater than or equal to the first threshold, stop the dehydration step,
The washing machine according to any one of claims 1 to 3, wherein when the initial displacement is smaller than the second threshold value, the high-speed dewatering operation is started without executing the draining step. The displacement detection means includes
The washing machine according to any one of claims 1 to 4, further comprising an acceleration sensor that detects an acceleration generated in the outer tub.   The washing machine according to any one of claims 1 to 5, wherein the third threshold value can be changed.

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