JP7126068B2 - drum washing machine - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a drum-type washing machine that detects an unbalanced state of clothes in a rotating drum.

2. Description of the Related Art Conventionally, among drum-type washing machines, there is known a drum-type washing machine that detects whether clothes in a rotating drum provided inside a water tub are unevenly distributed in front of or behind the rotating drum.

If there is an unbalanced load in front of the rotating drum, the following problems arise.

The first problem is that the vibration of the front part of the water tub is highly likely to cause abnormal vibration of the washing machine body. A sealing member or the like is provided between the inlet of the washing machine body and the opening of the water tub to suppress leakage of washing water. Therefore, the vibration of the front part of the water tub is easily transmitted to the main body of the washing machine.

The second problem is that the forward biased load puts a large load on the shaft. A shaft is connected to the rear of the rotating drum. Therefore, when there is an unbalanced load behind the rotating drum, the shaft is not subjected to a large load. On the other hand, when there is an unbalanced load in front of the rotary drum, the shaft is subjected to a large load because the distance from the shaft to the front of the rotary drum is long. This can damage the shaft.

Patent Literature 1 discloses a drum-type washing machine that estimates the position of unbalanced load from the vibration of the front part of the water tank and the correlation obtained from the experiment, and determines the unbalanced state of the clothes.

The washing machine in Patent Document 1 includes a water tank supported inside a washing housing, a rotating drum rotatably provided inside the water tank, and a front part of the upper surface of the water tank, which detects vibration components in three-dimensional directions. and vibration detection means for During the spin-drying operation, the washing machine uses the two-way vibration components detected at the front of the water tub and the experimentally obtained correlation of the vibration components at the rear of the water tub with respect to the vibration components at the front of the water tub. Identify the location of the unbalanced load in the water tank.

JP 2010-136903 A

However, since the conventional configuration estimates the position of the unbalanced load based on the correlation obtained by the experiment, the accuracy of specifying the position of the unbalanced load is low. Therefore, it could be erroneously determined whether the imbalance condition was forward or backward.

The present disclosure provides a drum-type washing machine that senses the vibration of the tub and determines whether the unbalanced load due to the laundry in the rotating drum is forward or backward based on the sensed value.

A drum-type washing machine according to the present disclosure includes a housing, an outer tub that is oscillatably supported inside the housing, and a rotatably disposed interior of the outer tub, with a rotation axis that is horizontal or inclined from the horizontal. a motor disposed inside the housing and configured to rotate the inner tank about a rotation axis; and a first shaft disposed in the outer tank and intersecting with each other in a side view. and a vibration detection unit configured to detect movement information of the outer tub along the second axis, and a motor is controlled based on the movement information of the outer tub detected by the vibration detection unit to perform washing operation and rinsing operation. and a controller configured to control the dehydration operation.

In the dehydration operation, when the movement information of the outer tub along either one of the first axis and the second axis becomes a maximum value, By comparing the movement information of the outer tank and the movement information of the outer tank along one axis when the movement information of the outer tank is a minimum value along the other axis, the position of the unbalanced load of the inner tank is determined, and the motor is controlled based on the determined position of the unbalanced load of the inner tank.

The drum-type washing machine according to the present disclosure can detect the unbalanced load due to the laundry in the rotating drum and determine whether the unbalanced load due to the laundry in the rotating drum is forward or backward.

FIG. 1 is a side cross-sectional view of a drum-type washing machine according to Embodiment 1 of the present disclosure. FIG. 2A is a schematic diagram when an unbalanced load occurs in front of the rotating drum of the drum-type washing machine according to Embodiment 1 of the present disclosure. FIG. 2B is a schematic diagram when an unbalanced load occurs behind the rotating drum of the drum-type washing machine according to Embodiment 1 of the present disclosure. 3A is a schematic diagram plotting vibration amplitude values detected by a vibration detection unit when an unbalanced load exists in front of the drum-type washing machine according to Embodiment 1 of the present disclosure. FIG. FIG. 3B is a schematic diagram plotting vibration amplitude values detected by the vibration detection unit when an unbalanced load exists in the rear of the drum-type washing machine according to Embodiment 1 of the present disclosure. FIG. 4 is a flowchart for determining the position of an unbalanced load in the dewatering operation of the drum-type washing machine according to Embodiment 1 of the present disclosure.

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters and redundant descriptions of substantially the same configurations may be omitted. This is to avoid unnecessary verbosity in the following description and to facilitate understanding by those skilled in the art.

It should be noted that the accompanying drawings and the following description are provided for a full understanding of the present disclosure by those skilled in the art and are not intended to limit the claimed subject matter.

Each figure is a schematic diagram and is not necessarily strictly illustrated. Also, in each drawing, substantially the same constituent elements may be denoted by the same reference numerals, and their explanations may be omitted or simplified.

(Embodiment 1)
Embodiment 1 will be described below with reference to FIGS. 1 to 3B.

FIG. 1 is a side cross-sectional view of a drum-type washing machine according to Embodiment 1. FIG. In FIG. 1, the front-rear direction of the washing machine body is also referred to as the X-axis, the vertical direction as the Y-axis, and the left-right direction as the Z-axis. It should be noted that these axes are shown for convenience only and do not limit the present disclosure in any way.

In FIG. 1 , the water tank 19 is formed in a cylindrical shape with a bottom and is arranged inside the housing 6 . The water tank 19 is elastically supported by a plurality of suspensions 31 and a plurality of anti-vibration dampers 26 such that the central axis of the tank 19 is lowered from the front to the rear. A front portion of the water tank 19 is covered with a water tank cover 27 made of resin. A sealing member 23 made of a resin material is provided between the front portion of the water tank cover 27 and the front portion of the housing 6 . The water tank cover 27 and the water tank 19 constitute a water tank unit 37 . The resin material forming the sealing member 23 includes a synthetic rubber material.

A lid 10 is provided so as to be openable and closable so as to cover the opening of the housing 6 . By opening the lid 10 , the user can load and unload the laundry (clothes) into the rotary drum 17 .

A rotary drum 17 is rotatably arranged inside the water tank 19 . The rotating drum 17 is formed in a cylindrical shape with a bottom. That is, the rotating drum 17 has the shape of a bottomed cylinder. A large number of water passage holes 18 are provided on the side surface of the rotating drum 17 . Further, the inner wall surface of the rotating drum 17 is provided with a plurality of projecting plates 22 for stirring the clothes. Inside the rotary drum 17, each of the projection plates 22 lifts the clothes to a predetermined height as the rotary drum 17 rotates, and then drops the lifted clothes downward.

One end of a shaft 24 is fixed to the bottom of the rotating drum 17 . The shaft 24 is provided so as to pass through the central axis of the rotating drum 17 and extend to the rear surface of the rotating drum 17 . The shaft 24 is supported by bearings 25 so as to pass through the bottom of the water tank 19 . A bearing case 15 is arranged at the bottom of the water tank 19 . The bearing case 15 accommodates the bearing 25 . The other end of the shaft 24 passes through the bearing case 15 and is fixed to a drum pulley 28 arranged below the bearing case 15 .

A drum driving motor 21 is arranged below the water tank 19 . A belt 29 is stretched between the drum pulley 28 and the drum drive motor 21 . A rotational drive force from the drum drive motor 21 is transmitted to the rotary drum 17 via the belt 29 , the drum pulley 28 and the shaft 24 . Thereby, the rotating drum 17 rotates.

A vibration detection device 40 is arranged in front of the upper surface of the water tank cover. The vibration detection device 40 is composed of a three-axis acceleration sensor. The vibration detection device 40 detects movement information of the water tank unit 37 along the X-axis and the Y-axis. Specifically, the vibration detection device 40 acquires the acceleration values of the water tank unit 37 along the X-axis and the Y-axis, and detects the vibration amplitude value from the acquired acceleration values.

A controller 20 is provided behind the housing 6 . The control unit 20 controls a series of operation operations including washing operation, rinsing operation, spin-drying operation and drying operation based on instruction input by the user and operation state monitoring of each unit.

Next, operation of the drum-type washing machine will be described with reference to FIGS. 2A and 2B.

First, the basic operation of the washing operation in this embodiment will be described.

The washing operation includes a washing operation in which the clothes soaked in the detergent water are rotated in the rotating drum 17 in the water tank unit 37, a rinse operation in which the clothes containing the detergent water are rinsed with water, and a water-containing clothes are dehydrated. It consists of a dehydration operation.

First, the washing operation will be explained. A user puts clothes on the rotating drum 17 . Subsequently, the user operates the operation display unit (not shown) of the washing machine to start the washing operation. When the washing operation is started, a predetermined amount of tap water is supplied (water supplied) into the water tank 19 . Water is also supplied to a detergent case (not shown) in which detergent is stored, and the detergent water obtained by dissolving the detergent in water is introduced into the water tank 19 . After the water supply is completed, the rotary drum 17 is rotated by the drum driving motor 21, and the washing operation is started. In the washing operation, the clothes are agitated for a predetermined washing time, and dirt and the like attached to the clothes are removed.

Next, the rinsing operation will be described. When the washing operation is finished, the dirty washing water is discharged from the water tank 19, and the washing operation is shifted to the rinsing operation. The rinsing operation is performed by repeating the rinsing operation and the dewatering operation. In the rinsing operation, a predetermined amount of tap water is supplied into the water tank 19, the rotary drum 17 rotates, and the dirt removed from the clothes during the washing operation and the washing water are discharged from the water tank 19. - 特許庁The dewatering operation will be described later. When the rinsing operation ends, the dehydration operation in the dehydration operation is started.

Next, dehydration operation will be described. In the dehydration operation, the washing water contained in the laundry is dehydrated by rotating the drum drive motor 21 at high speed. When the dehydration operation starts, the controller 20 starts rotating the rotating drum 17 and increases the rotating speed step by step until the rotating drum 17 reaches about 800 r/min. The laundry accommodated in the rotating drum 17 sticks to the inner wall of the rotating drum 17 due to centrifugal force as the rotation speed increases.

When the rotating drum 17 rotates at a high speed, the laundry does not stick evenly to the inner peripheral wall of the rotating drum 17, and the position of the laundry inside the rotating drum 17 is unbalanced. As a result, an unbalanced load may be generated on the rotating drum 17 . When an unbalanced load is generated, the water tank unit 37 driven by the drum drive motor 21 does not perform a predetermined circular motion, but rotates in an elliptical motion. In the present embodiment, unbalance determination is performed to detect this unbalanced state.

The imbalance determination is started when the rotational speed of the rotary drum 17 reaches approximately 800 r/min. In the imbalance determination, an unbalanced state is detected from the locus of vibration of the rotating drum 17 and the water tank unit 37 .

FIG. 2A is a schematic diagram when an unbalanced load occurs in front of the rotating drum of the drum-type washing machine according to Embodiment 1. FIG. FIG. 2B is a schematic diagram when an unbalanced load occurs behind the rotating drum of the drum-type washing machine according to Embodiment 1. FIG. 2A and 2B, as in FIG. 1, the front-rear direction of the washing machine body is also referred to as the X-axis, the up-down direction as the Y-axis, and the left-right direction as the Z-axis. It should be noted that these axes are shown for convenience only and do not limit the present disclosure in any way.

When the laundry 50 is biased in front of the rotating drum 17, the rotating drum 17 swings in an ellipse centered on the rotation center A behind the rotating drum 17. - 特許庁Note that the rotation center A takes different positions depending on the position and amount of the laundry 50 . As the rotary drum 17 oscillates, the water tank unit 37 and the vibration detection device 40 also vibrate in an elliptical shape around the center of rotation A behind the rotary drum 17 .

Therefore, when the water tank unit 37 is viewed from the side, as shown in FIG. 2A, the front of the water tank unit 37 vibrates so as to move greatly up and down.

Similarly, when the laundry 60 is biased toward the rear of the rotary drum 17, the rotary drum 17 swings in an elliptical shape centered on the center of rotation B in front of the rotary drum 17. As shown in FIG.

Therefore, when the water tank unit 37 is viewed from the side, as shown in FIG. 2B, the rear of the water tank unit 37 vibrates so as to move up and down greatly.

Next, the vibration amplitude value detected by the vibration detection device 40 when an unbalanced load occurs will be described with reference to FIGS. 3A and 3B.

3A is a schematic diagram plotting vibration amplitude values detected by a vibration detection unit when an unbalanced load exists in the front of the drum-type washing machine according to Embodiment 1. FIG. 3B is a schematic diagram plotting vibration amplitude values detected by the vibration detection unit when an unbalanced load exists in the rear of the drum-type washing machine according to Embodiment 1. FIG. 3A and 3B, similarly to FIG. 1, the longitudinal direction of the washing machine body is defined as the X axis, and the vertical direction is defined as the Y axis. 3A and 3B, the vibration amplitude value in the X-axis direction is defined as X, and the vibration amplitude value in the Y-axis direction is defined as Y. As shown in FIG.

The trajectory of the vibration amplitude value in FIG. 3A is an ellipse rising to the right. The maximum value of X is defined as Xmax, and the minimum value as Xmin. The value of Y when X=Xmax is defined as Y1, and the value of Y when X=Xmin is defined as Y2. Y1 becomes larger than Y2 when an unbalanced load exists in front of the washing machine.

On the other hand, the trajectory of the vibration amplitude value in FIG. 3B is an ellipse rising to the left. Similarly, when Y1 and Y2 are obtained when an unbalanced load exists behind the washing machine, Y1 is smaller than Y2.

Therefore, by comparing Y1 and Y2, it can be easily determined whether the unbalanced load is in the front or the rear.

Next, determination processing for imbalance determination will be described with reference to FIG.

When a predetermined period of time elapses after the number of revolutions of the rotary drum 17 reaches about 800 r/min, the determination process is started (S100).

First, the control unit 20 sets Xmax to "0" and Xmin to "0" as initial values. Similarly, the controller 20 sets Y1 to "0" and Y2 to "0" (S200).

Next, the control unit 20 acquires the vibration amplitude value detected by the vibration detection device 40 (S300).

Next, the control unit 20 determines whether the acquired value of X is greater than Xmax (S310). In S310, if it is determined that the obtained X value is greater than Xmax (S310, Yes), the control unit 20 substitutes the X value for Xmax and the Y value for Y1 (S320), The process moves to S400. If it is determined in S310 that the acquired value of X is not greater than (smaller than or equal to) Xmax (S310, No), the process proceeds to S330.

Next, the control unit 20 determines whether the acquired value of X is smaller than Xmin (S330). If it is determined in S330 that the obtained X value is smaller than Xmin (S330, Yes), the control unit 20 substitutes the X value for Xmin and the Y value for Y2 (S340). , the process proceeds to S400. If it is determined in S330 that the acquired value of X is not smaller (larger or equal) than Xmin (S330, No), the process proceeds to S400.

Next, the control unit 20 determines whether or not the elapsed time due to the repeated processing has reached a predetermined time (S400). When the control unit 20 determines that the elapsed time due to the repeated processing has not reached the predetermined time (S400, No), the control unit 20 acquires the vibration amplitude value detected by the vibration detection device 40 again (S300), is determined (S310, S330).

When the control unit 20 determines that the elapsed time of the repeated processing has reached the predetermined time (S400, Yes), it compares the values of Y1 and Y2 (S500). When the control unit 20 determines that the value of Y1 is greater than the value of Y2 or that the value of Y1 is equal to the value of Y2 (S500, No), it determines that there is an unbalanced load in front (S510). Subsequently, the control unit 20 sets the allowable value of the vibration amplitude value to a small allowable value that is relatively lower than the predetermined allowable value (S520), and ends the determination process.

Similarly, when the control unit 20 determines that the value of Y1 is smaller than the value of Y2 (S500, Yes), it determines that the unbalanced load is in the rear (S530). Further, the control unit 20 sets the allowable value of the vibration amplitude value to a large allowable value, which is a value relatively higher than the predetermined allowable value (S540), and ends the determination process.

The update time (S300 to S400) of the value of X and the value of Y is preferably set to ⅛ or less of the rotation period of the rotary drum 17. FIG. This ensures accuracy of determination.

In addition, it is preferable that the predetermined time in the repetition process is set longer than the rotation period of the rotary drum 17 . By repeating the processing from S300 to S400, Xmax, Xmin, Y1, and Y2 can be obtained.

After the determination process is completed, the control unit 20 detects the vibration amplitude value with the vibration detection device 40 and compares it with the allowable value. At this time, as the vibration amplitude value, the maximum value and minimum value along each of the X-axis, Y-axis and Z-axis are used. Similarly, the allowable values are set along the X-, Y-, and Z-axes.

Note that, in the present embodiment, when the detected vibration amplitude value exceeds the allowable value in any one of the X-axis, Y-axis, and Z-axis, the control unit 20 detects that the vibration amplitude value is Determined to be larger than the allowable value. However, the control unit 20 may determine that the vibration amplitude value is greater than the allowable value only when the vibration amplitude value exceeds the allowable value on all of the X, Y, and Z axes.

If the control unit 20 determines that the detected vibration amplitude value is smaller than the allowable value or equal to the allowable value, the dehydration operation is continued. When the control unit 20 determines that the detected vibration amplitude value is larger than the allowable value, it stops the rotation of the rotating drum 17 and shifts from the dewatering operation to the corrected rinsing operation which is a correction operation.

First, water is supplied into the rotating drum 17 to perform a modified rinsing operation to detangle the laundry. After the modified rinsing operation is finished, the spin-drying operation is started again.

If the unbalanced state is not resolved even after repeating the corrective rinsing operation and the dehydrating operation a predetermined number of times, the control unit 20 notifies the unbalanced state. When the abnormality is notified, the user needs to open the lid 10, take out the laundry in the rotating drum 17, and loosen the tangles. After removing the entanglement, the user puts the laundry into the rotating drum 17, closes the lid 10, and restarts the operation via the operation display unit. When the operation is restarted by the user, the control unit 20 starts dehydration operation again.

The operation of the determination processing configured as described above will be described.

When the detected vibration amplitude value is larger than the large allowable value, the control unit 20 stops the dehydration operation and performs a corrective operation regardless of whether the unbalanced load is in the front or the rear.

When the detected vibration amplitude value is smaller than the large allowable value and larger than the small allowable value, the control unit 20 controls whether the unbalanced load is in the front or the rear. , behave differently. That is, when the unbalanced load is in front, the control unit 20 stops the dehydration operation and performs the correction operation. On the other hand, when the unbalanced load is on the rear side, the controller 20 continues the dehydration operation.

If the unbalanced load is in the front, there is a possibility that abnormal noise will be generated and the shaft 24 will be damaged. Therefore, if the unbalanced load is forward, it is desirable to correct the imbalance condition. On the other hand, when the unbalanced load is in the rear, the possibility of occurrence of abnormality is relatively low. Therefore, the extension of washing operation time and excessive use of water (increase in water bills), etc., are problems due to corrective rinsing. Therefore, by setting the tolerance to a relatively high large tolerance, no more than necessary corrective action is taken.

As described above, the control unit 20 switches the allowable value of the vibration amplitude value based on the position of the unbalanced load, so that the unbalanced state can be appropriately dealt with.

As described above, the drum-type washing machine according to the present disclosure includes the housing 6, the water tank unit 37 including the water tank 19 that is oscillatably supported inside the housing 6, and the water tank unit 37 that can rotate freely. A rotating drum 17 disposed with a rotating shaft that is horizontal or inclined from the horizontal, and a drum drive motor 21 that is disposed inside the housing 6 and configured to rotate the rotating drum 17 about the rotating shaft. a vibration detection device 40 disposed in the water tank unit 37 and configured to detect movement information of the water tank unit 37 along a first axis and a second axis that intersect each other in a side view; a control unit 20 configured to control the drum drive motor 21 based on movement information of the water tub unit 37 detected by the device 40, and to control the washing operation, the rinsing operation and the dewatering operation. The control unit 20 controls the motion information of the water tank unit 37 along either the first axis or the second axis in the dehydration operation to have a maximum value along the other axis, which is different from the one axis. By comparing the motion information of the water tank unit 37 with the motion information of the water tank unit 37 along one axis when the motion information of the water tank unit 37 along the other axis is a minimum value, the rotation The position of the unbalanced load on the drum 17 is determined, and the drum drive motor 21 is controlled based on the determined position of the unbalanced load on the rotating drum 17 .

Thereby, the control unit 20 can directly determine the unbalanced state from the actual measurement value by the vibration detection device 40 . Therefore, the control unit 20 can accurately determine whether the unbalanced load is in the front or the rear. Therefore, the occurrence of abnormalities due to the uneven load in the rotating drum 17 can be prevented with high accuracy.

In addition, the control unit 20 may be configured to determine whether the position of the unbalanced load of the rotating drum 17 is in the front or the rear of the rotating drum 17 during the dewatering operation.

This is expected to be particularly effective in the dehydration operation with a high rotational speed.

Further, the control unit 20 is configured to continue the dehydration operation when the movement information of the water tank unit 37 detected by the vibration detection device 40 is smaller than or equal to a predetermined allowable value during the dehydration operation. The rotation of the rotary drum 17 may be stopped when the movement information of the water tank unit 37 detected by the vibration detection device 40 is larger than a predetermined allowable value.

Thereby, different processing can be performed according to the detected motion information.

Further, the control unit 20 is configured to continue the dehydration operation when the movement information of the water tank unit 37 detected by the vibration detection device 40 is smaller than or equal to a predetermined allowable value during the dehydration operation. The rotation of the rotary drum 17 may be stopped when the movement information of the water tank unit 37 detected by the vibration detection device 40 is larger than a predetermined allowable value. Further, the control unit 20 is configured to set the predetermined allowable value relatively smaller than the predetermined allowable value when it is determined that the position of the unbalanced load of the rotating drum 17 is in front of the rotating drum 17. When it is determined that the position of the unbalanced load of the rotating drum 17 is behind the rotating drum 17, the predetermined allowable value is set relatively larger than the predetermined allowable value. may

Thereby, an allowable value that does not apply a load to the shaft 24 can be set according to the position of the unbalanced load.

Further, in the dehydration operation, when the movement information of the water tank unit 37 detected by the vibration detection device 40 is larger than a predetermined allowable value, the control unit 20 stops the rotation of the rotary drum 17 to correct the dehydration operation. It may be arranged to resume the dehydration operation after the action has been taken and the corrective action has been completed.

Thereby, when the movement information of the water tank unit 37 is larger than the predetermined allowable value, the correction operation can be performed.

The first axis is an axis parallel to the rotation axis, and the second axis is an axis parallel to an imaginary line connecting the highest position and the lowest position on the front surface of the horizontal or rotary drum 17. may

Thereby, the control unit 20 can more accurately determine whether the unbalanced load is in the front or the rear.

Also, clothes may be stored inside the rotating drum 17 . The control unit 20 may be configured to determine the bias of the clothes accommodated inside the rotating drum 17 inside the rotating drum 17 as the position of the biased load of the rotating drum 17 .

As a result, the occurrence of abnormalities caused by the uneven load due to the clothes in the rotating drum 17 can be prevented with high accuracy.

Further, the control unit 20 may determine the position of the unbalanced load of the rotating drum 17 after a predetermined period of time has elapsed since the number of revolutions of the rotating drum 17 reached a predetermined number of revolutions.

As a result, the position of the unbalanced load on the rotating drum 17 can be determined after the number of rotations of the rotating drum 17 reaches the predetermined number of rotations.

Also, the vibration detection device 40 may be an acceleration sensor. The vibration detection device 40 may be configured to detect the acceleration of the water tank unit 37 or the vibration amplitude value of the water tank unit 37 as the movement information.

Thereby, the position of the unbalanced load in the rotary drum 17 can be determined based on the acceleration or vibration amplitude value.

(Other embodiments)
As described above, Embodiment 1 has been described as an example of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to embodiments with modifications, replacements, additions, omissions, and the like.

Therefore, other embodiments will be exemplified below.

In Embodiment 1, the mounting position of the vibration detection device 40 in the horizontal direction is not limited. That is, the vibration detection device 40 may be attached above the rotating shaft in the upper part of the water tank unit 37 . Also, the vibration detection device 40 may be attached to either the left or right end above the water tank unit 37 . By attaching the vibration detection device 40 to either the left or right end, it is possible to measure the vibration amplitude values in all three axes of the front-back direction, the left-right direction, and the up-down direction.

In Embodiment 1, the front upper portion of the water tank unit 37 has been described as an example of the mounting position of the vibration detection device 40 . However, the vibration detection device 40 only needs to be attached to the water tank unit 37, and the mounting location is not limited to the front upper portion of the water tank unit 37. For example, the vibration detection device 40 may be attached to the rear upper portion of the water tank unit 37 , or to the sides and bottom of the water tank unit 37 .

In Embodiment 1, an example of detecting movement information of the water tank unit 37 along the X-axis and the Y-axis has been described as an example of detecting the movement information of the water tank unit 37 by the vibration detection device 40 . However, the axes along which the vibration detection device 40 detects movement information of the water tank unit 37 are not limited to the X-axis and the Y-axis. For example, the vibration detection device 40 may be configured to detect movement information of the aquarium unit 37 along first and second axes that intersect each other in side view.

In Embodiment 1, an example was described in which the control unit 20 performs determination processing using the vibration amplitude value detected by the vibration detection device 40 . However, the value used by the controller 20 is not limited to the vibration amplitude value. For example, the control unit 20 may perform determination processing using the acceleration value detected by the vibration detection device 40 .

In the first embodiment, the vibration detection device 40 is a three-axis acceleration sensor, and the vibration amplitude value is described as an example of the value detected by the vibration detection device 40 . However, the value detected by the vibration detection device 40 is not limited to the vibration amplitude value or the acceleration, as long as the value indicates the movement of the water tank unit 37, that is, the value correlated with the movement information of the water tank unit 37. For example, the vibration detection device 40 may be a speed sensor, and the vibration detection device 40 may detect a speed value. In this case, the control unit 20 may perform determination processing using the velocity value detected by the vibration detection device 40 .

INDUSTRIAL APPLICABILITY The present disclosure is applicable to drum-type washing machines in which clothes may be biased during dehydration.

6 Housing 10 Lid 15 Bearing Case 17 Rotating Drum (Inner Tank)
18 water passage hole 19 water tank (outer tank)
20 control unit 21 drum drive motor (motor)
22 projecting plate 23 sealing member 24 shaft (rotating shaft)
26 anti-vibration damper 27 tank cover (outer tank)
28 drum pulley 29 belt 31 suspension 37 water tank unit (outer tank)
40 Vibration detector (vibration detector)
50,60 Laundry

Claims (9)

a housing;
an outer tank that is swingably supported inside the housing;
an inner tank that is rotatably disposed inside the outer tank and that has a rotation axis that is horizontal or inclined from the horizontal;
a motor disposed inside the housing and configured to rotate the inner tank about the rotation shaft;
a vibration detection unit disposed in the outer tank and configured to detect movement information of the outer tank along a first axis and a second axis that intersect each other in a side view;
a control unit configured to control the motor based on the movement information of the outer tub detected by the vibration detection unit, and to control the washing operation, the rinsing operation, and the dewatering operation;
The control unit, in the dewatering operation,
The outer tank along the other axis different from the one axis when the movement information of the outer tank along one of the first axis and the second axis is the maximum value. by comparing the movement information of the outer tank with the movement information of the outer tank along the other axis when the movement information of the outer tank along the one axis is a minimum value,
determining the position of the unbalanced load of the inner tank, and controlling the motor based on the determined position of the unbalanced load of the inner tank;
Drum type washing machine. The control unit, in the dewatering operation,
It is configured to determine whether the position of the unbalanced load of the inner tank is forward or rearward of the inner tank.
The drum-type washing machine according to claim 1. The control unit, in the dewatering operation,
The dewatering operation is continued when the movement information of the outer tub detected by the vibration detection unit is smaller than or equal to a predetermined allowable value,
When the movement information of the outer tank detected by the vibration detection unit is larger than the predetermined allowable value, the rotation of the inner tank is stopped.
The drum-type washing machine according to claim 1 or 2. The control unit, in the dewatering operation,
The dewatering operation is continued when the movement information of the outer tub detected by the vibration detection unit is smaller than or equal to a predetermined allowable value,
When the movement information of the outer tank detected by the vibration detection unit is larger than the predetermined allowable value, the rotation of the inner tank is stopped,
When it is determined that the position of the unbalanced load of the inner tank is in front of the inner tank, the predetermined allowable value is set relatively smaller than the predetermined allowable value. ,
When it is determined that the position of the unbalanced load of the inner tank is behind the inner tank, the predetermined allowable value is set relatively larger than the predetermined allowable value. there is
The drum-type washing machine according to claim 2. The control unit, in the dewatering operation,
When the movement information of the outer tub detected by the vibration detection unit is larger than the predetermined allowable value, the rotation of the inner tub is stopped, a correction operation different from the dehydration operation is performed, and the correction operation is performed. configured to resume the dehydration operation after completion;
The drum-type washing machine according to claim 3 or 4. The first axis is an axis parallel to the rotation axis,
The second axis is horizontal or parallel to an imaginary line connecting the highest position and the lowest position of the front surface of the inner tank,
The drum-type washing machine according to any one of claims 1 to 5. Clothing is accommodated inside the inner tank,
The control unit is configured to determine, as the position of the unbalanced load of the inner tank, the bias of the clothes housed in the inner tank in the interior of the inner tank.
The drum-type washing machine according to any one of claims 1 to 6. The control unit determines the position of the unbalanced load of the inner tank after a predetermined time has elapsed since the number of revolutions of the inner tank reached a predetermined number of revolutions.
The drum-type washing machine according to any one of claims 1 to 7. The vibration detection unit is an acceleration sensor,
configured to detect the acceleration of the outer tank or the vibration amplitude value of the outer tank as the movement information;
The drum-type washing machine according to any one of claims 1 to 8.

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