阅读说明：本技术 滚筒式洗衣机 (Drum type washing machine ) 是由 井上洋一朗 于 2019-07-25 设计创作，主要内容包括：本公开的滚筒式洗衣机包括机壳、外筒、内筒、马达、振动检测部以及控制部。控制部构成为,在脱水动作中,通过对在外筒沿着第1轴线和第2轴线中的任一个轴线的运动信息成为极大值的情况下外筒沿着与一个轴线不同的另一个轴线的运动信息同在外筒沿着一个轴线的运动信息成为极小值的情况下外筒沿着另一个轴线的运动信息进行比较,来判定内筒的偏载的位置,基于判定的内筒的偏载的位置来控制马达。(A drum type washing machine includes a casing, an outer tub, an inner tub, a motor, a vibration detecting unit, and a control unit. The control unit is configured to determine a position of unbalance of the inner cylinder by comparing motion information of the outer cylinder along the other axis different from the one axis when the motion information of the outer cylinder along either one of the 1 st axis and the 2 nd axis becomes a maximum value with the motion information of the outer cylinder along the other axis when the motion information of the outer cylinder along the one axis becomes a minimum value during the dehydration operation, and to control the motor based on the determined position of unbalance of the inner cylinder.)

1. A drum type washing machine, in which,

the drum type washing machine includes:

a housing;

an outer cylinder supported in the housing so as to be freely swingable;

an inner cylinder which is rotatably disposed inside the outer cylinder and is provided with a rotation shaft thereof being horizontal or inclined with respect to the horizontal;

a motor disposed inside the housing and configured to rotate the inner tube around the rotation axis;

a vibration detection unit disposed in the outer cylinder and configured to detect movement information of the outer cylinder along a 1 st axis and a 2 nd axis intersecting each other in a side view; and

a control unit configured to control the motor based on the motion information of the outer tub detected by the vibration detection unit to control a washing operation, a rinsing operation, and a dehydrating operation,

the control unit is configured to, during the dewatering operation,

by comparing the movement information of the outer tub along another axis different from the one axis in a case where the movement information of the outer tub along either one of the 1 st axis and the 2 nd axis becomes a maximum value with the movement information of the outer tub along the other axis in a case where the movement information of the outer tub along the one axis becomes a minimum value,

determining a position of the offset load of the inner barrel, and controlling the motor based on the determined position of the offset load of the inner barrel.

2. The drum type washing machine as claimed in claim 1,

the control unit is configured to, during the dewatering operation,

determining whether the position of the offset load of the inner barrel is a front side of the inner barrel or a rear side of the inner barrel.

3. The drum type washing machine as claimed in claim 1 or 2, wherein,

the control unit is configured to, during the dewatering operation,

continuing the dehydrating operation when the motion information of the outer tub detected by the vibration detecting unit is less than or equal to a predetermined allowable value,

and stopping the rotation of the inner cylinder when the movement information of the outer cylinder detected by the vibration detection unit is greater than the predetermined allowable value.

4. The drum type washing machine as claimed in claim 2,

the control unit is configured to, during the dewatering operation,

continuing the dehydrating operation when the motion information of the outer tub detected by the vibration detecting unit is less than or equal to a predetermined allowable value,

stopping the rotation of the inner cylinder when the movement information of the outer cylinder detected by the vibration detecting unit is larger than the predetermined allowable value,

setting the predetermined allowable value to be relatively smaller than the predetermined allowable value when it is determined that the position of the unbalance loading of the inner tube is the front side of the inner tube,

when it is determined that the position of the unbalance loading of the inner tube is the rear side of the inner tube, the predetermined allowable value is set to be relatively larger than the predetermined allowable value.

5. The drum type washing machine as claimed in claim 3 or 4, wherein,

the control unit is configured to, during the dewatering operation,

when the movement information of the outer cylinder detected by the vibration detection unit is greater than the predetermined allowable value, the inner cylinder is stopped from rotating, a correction operation different from the dehydration operation is performed, and the dehydration operation is restarted after the correction operation is completed.

6. A drum type washing machine as claimed in any one of claims 1 to 5,

the 1 st axis is an axis parallel to the rotation axis,

the 2 nd axis is horizontal or an axis parallel to an imaginary line connecting the highest position and the lowest position of the front surface of the inner cylinder.

7. A drum type washing machine as claimed in any one of claims 1 to 6,

the laundry is accommodated in the interior of the inner tub,

the control unit is configured to determine an offset of the laundry accommodated in the interior of the inner tub as the position of the offset load of the inner tub.

8. A drum type washing machine as claimed in any one of claims 1 to 7,

the control unit determines the position of the unbalance load of the inner tube after a predetermined time has elapsed since the rotational speed of the inner tube reaches a predetermined rotational speed.

9. A drum type washing machine as claimed in any one of claims 1 to 8,

the vibration detection section is an acceleration sensor,

the vibration detection unit is configured to detect an acceleration of the outer tube or a vibration amplitude value of the outer tube as the motion information.

Technical Field

The present disclosure relates to a drum type washing machine that detects an unbalance state of laundry in a rotary drum.

Background

Conventionally, there is known a drum-type washing machine which detects whether laundry in a rotary drum provided in a water tub is offset to the front side or the rear side of the rotary drum.

If there is an offset load on the front side of the rotary drum, there is the following problem.

The first problem is that there is a high possibility of abnormal vibration of the washing machine main body caused by vibration of the front of the tub. A sealing member for suppressing leakage of washing water is provided between an inlet of a washing machine main body and an opening of a water tank. Thus, the vibration of the front of the tub is easily transmitted to the washing machine main body.

A second problem is that the front-side unbalance loads a large load on the shaft. The shaft is connected to the rear side of the rotary drum. Therefore, when there is an offset load on the rear side of the rotary drum, a large load is not applied to the shaft. On the other hand, when there is an offset load on the front side of the rotary drum, a large load is applied to the shaft because the distance from the shaft to the front side of the rotary drum is long. This may damage the shaft.

Patent document 1 discloses a drum-type washing machine that estimates the position of unbalance loading based on the vibration of the front of a water tub and a correlation obtained through experiments, and determines the unbalance state of laundry.

The washing machine disclosed in patent document 1 includes a water tub supported inside a washing machine casing, a rotary drum rotatably provided inside the water tub, and a vibration detection member provided in front of an upper surface of the water tub and detecting a vibration component in a three-dimensional direction. The washing machine determines the position of the unbalance loading of the water tank by using the vibration components in two directions detected at the front part of the water tank and the correlation between the vibration component at the rear part of the water tank and the vibration component at the front part of the water tank obtained through experiments during the dehydration action.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent application No. 2010-136903

Disclosure of Invention

However, in the conventional configuration, the position of the unbalance load is estimated based on the correlation obtained by an experiment, and therefore, the accuracy of determining the position of the unbalance load is low. Therefore, there is a possibility that erroneous determination may be made as to whether an unbalanced state exists on the front side or on the rear side.

The present disclosure provides a drum type washing machine: the vibration of the water tank is detected, and whether the unbalance load caused by the washing in the rotary drum is in the front side or the rear side is judged based on the detected value.

The drum type washing machine of the present disclosure includes: a housing; an outer cylinder supported in a freely swingable manner inside the housing; an inner cylinder which is rotatably disposed inside the outer cylinder and is provided with a rotation shaft thereof being horizontal or inclined with respect to the horizontal; a motor disposed inside the housing and configured to rotate the inner cylinder about the rotation axis; a vibration detection unit disposed on the outer cylinder and configured to detect movement information of the outer cylinder along a 1 st axis and a 2 nd axis intersecting each other in a side view; and a control unit configured to control the motor based on the motion information of the outer tub detected by the vibration detection unit, and to control the washing operation, the rinsing operation, and the dehydrating operation.

The control unit is configured to determine a position of unbalance of the inner cylinder by comparing motion information of the outer cylinder along the other axis different from the one axis when the motion information of the outer cylinder along either one of the 1 st axis and the 2 nd axis becomes a maximum value with the motion information of the outer cylinder along the other axis when the motion information of the outer cylinder along the one axis becomes a minimum value during the dehydration operation, and to control the motor based on the determined position of unbalance of the inner cylinder.

The drum type washing machine of the present disclosure can detect an unbalance load caused by laundry in a rotary drum and determine whether the unbalance load caused by the laundry in the rotary drum is on a front side or a rear side.

Drawings

Fig. 1 is a sectional view of a drum-type washing machine according to embodiment 1 of the present disclosure, as viewed from the side.

Fig. 2A is a schematic view of a drum-type washing machine according to embodiment 1 of the present disclosure when an offset load is generated on the front side of the rotary drum.

Fig. 2B is a schematic view of the drum-type washing machine according to embodiment 1 of the present disclosure when an offset load is generated on the rear side of the rotary drum.

Fig. 3A is a schematic diagram depicting the vibration amplitude value detected by the vibration detection unit when there is an offset load on the front side in the drum-type washing machine according to embodiment 1 of the present disclosure.

Fig. 3B is a schematic diagram depicting the vibration amplitude value detected by the vibration detection unit when there is an offset load on the rear side in the drum-type washing machine according to embodiment 1 of the present disclosure.

Fig. 4 is a flowchart of the determination of the position of unbalance loading in the spin-drying operation of the drum-type washing machine according to embodiment 1 of the present disclosure.

Detailed Description

Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings as appropriate. However, a detailed description thereof will be omitted in some cases. For example, detailed descriptions of widely known items and repetitive descriptions of substantially the same structure may be omitted. This is to avoid unnecessarily obscuring the following description, as will be readily understood by those skilled in the art.

In addition, the drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter recited in the claims by these contents.

The drawings are schematic and not necessarily strictly illustrated. In the drawings, substantially the same components are denoted by the same reference numerals, and description thereof may be omitted or simplified.

(embodiment mode 1)

Embodiment 1 will be described below with reference to fig. 1 to 3B.

Fig. 1 is a sectional view of a drum-type washing machine according to embodiment 1, as viewed from the side. In fig. 1, the front-back direction of the washing machine main body is also referred to as the X axis, the vertical direction is also referred to as the Y axis, and the horizontal direction is also referred to as the Z axis. These axes are shown merely for convenience and do not limit the present disclosure in any way.

In fig. 1, the water tank 19 is formed in a bottomed cylindrical shape and is disposed inside the housing 6. The water tank 19 is elastically supported by the plurality of suspending portions 31 and the plurality of vibration damping and cushioning members 26 such that the central axis thereof is lowered from the front to the rear. The front part 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 of the water tank cover 27 and the front of the cabinet 6. The water tank cover 27 and the water tank 19 constitute a water tank unit 37. In addition, the resin material forming the sealing member 23 contains a synthetic rubber material.

The cover 10 is openably and closably provided so as to cover the opening of the housing 6. The user can put laundry (laundry) into the rotary drum 17 or take laundry (laundry) out of the rotary drum 17 by opening the lid 10.

A rotatable drum 17 is rotatably disposed in the water tank 19. The rotary drum 17 is formed in a bottomed cylindrical shape. That is, the rotary drum 17 has a bottomed cylindrical shape. A plurality of water passage holes 18 are formed in the side surface of the rotary drum 17. Further, a plurality of projection plates 22 for stirring laundry are provided on the inner wall surface of the rotary drum 17. The plurality of protruding plates 22 lift the laundry to a predetermined height in the rotary drum 17 along with the rotation of the rotary drum 17, and then drop the lifted laundry downward.

One end of the shaft 24 is fixed to the bottom of the rotary drum 17. The shaft 24 is provided so as to extend toward the back surface of the rotary drum 17 through the center axis of the rotary drum 17. The shaft 24 is supported by a bearing 25 so as to penetrate the bottom of the water tank 19. A bearing box 15 is disposed at the bottom of the water tank 19. The bearing housing 15 accommodates a bearing 25. The other end of the shaft 24 penetrates the bearing housing 15 and is fixed to a drum pulley 28 disposed below the bearing housing 15.

Further, a drum drive motor 21 is disposed below the water tank 19. A belt 29 is provided between the drum pulley 28 and the drum drive motor 21. The rotational driving force of the drum driving motor 21 is transmitted to the rotary drum 17 via the transmission belt 29, the drum pulley 28, and the shaft 24. Thereby, the rotary drum 17 rotates.

A vibration detection device 40 is disposed in a front portion of the upper surface of the water tank cover. The vibration detection device 40 is constituted by a three-axis acceleration sensor. The vibration detecting 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 control unit 20 is provided on the rear side of the housing 6. The control unit 20 controls a series of operation operations of the washing operation, the rinsing operation, the dehydrating operation, and the drying operation based on the instruction input by the user and the operation state monitoring of each unit.

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

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

The washing operation includes a washing operation of rotating the laundry immersed in the detergent water in the rotary drum 17 in the water tank unit 37, a rinsing and washing operation of rinsing the laundry containing the detergent water with water, and a dehydrating operation of dehydrating the laundry containing the water.

First, the washing operation is explained. Laundry is thrown into the rotary drum 17 by a user. Next, the user operates an operation display unit (not shown) of the washing machine to start the washing operation. At the start of the washing operation, a predetermined amount of tap water is supplied (supplied) into the water tank 19. Further, water is also supplied to a detergent box (not shown) containing detergent, and detergent water obtained by dissolving detergent in water is poured into the water tank 19. After the water supply is completed, the rotary drum 17 is rotated by the drum drive motor 21, and the washing operation is started. In the washing operation, the laundry is agitated for a predetermined washing time to remove attached dirt and the like.

Next, the rinsing and washing operation will be described. At the end of the washing operation, the dirty washing water is discharged from the water tank 19, and the operation is shifted to the rinsing and washing operation. The rinsing and washing operation is performed by repeating the rinsing and washing operation and the dehydrating operation. In the rinsing and washing operation, a predetermined amount of tap water is supplied into water tank 19, rotary drum 17 is rotated, and dirt and washing water removed from the laundry during the washing operation are discharged from water tank 19. The dewatering operation will be described later. When the rinsing and washing operation is finished, the spinning operation of the spinning operation is started.

Next, the dehydration operation will be described. In the dehydration operation, the drum driving motor 21 rotates at a high speed, thereby dehydrating the washing water contained in the laundry. When the spin-drying operation is started, the control unit 20 starts the rotation of the rotary drum 17 and increases the rotation speed of the rotary drum 17 in steps until the rotation speed reaches about 800 r/min. The laundry accommodated in the rotary drum 17 adheres to the inner wall of the rotary drum 17 by the centrifugal force according to the increase of the rotation speed.

When the rotary drum 17 rotates at a high speed, the laundry may not be uniformly adhered to the inner peripheral wall of the rotary drum 17, and the position of the laundry may become unbalanced (non-uniform) inside the rotary drum 17, thereby causing an unbalance in the rotary drum 17. When the unbalance load occurs, the water tank unit 37 driven by the drum drive motor 21 performs a rotational motion that describes an ellipse, not a predetermined circular motion. In the present embodiment, the unbalance determination is performed to detect the unbalance state.

When the rotational speed of the rotary drum 17 reaches about 800r/min, unbalance determination is started. In the unbalance determination, the unbalance state is detected from the locus of the vibration of the rotary drum 17 and the water tank unit 37.

Fig. 2A is a schematic view of the drum-type washing machine according to embodiment 1 when an unbalance load occurs on the front side of the rotary drum. Fig. 2B is a schematic view of the drum-type washing machine according to embodiment 1 when an offset load is generated on the rear side of the rotary drum. In fig. 2A and 2B, similarly to fig. 1, the front-back direction of the washing machine main body is also referred to as the X axis, the vertical direction is also referred to as the Y axis, and the horizontal direction is also referred to as the Z axis. These axes are shown merely for convenience and do not limit the present disclosure in any way.

When the laundry 50 is offset to the front side of the rotary drum 17, the rotary drum 17 swings so as to draw an ellipse having the rotation center a at the rear of the rotary drum 17 as the center. The rotation center a is located at a different position depending on the position and amount of the laundry 50. As rotary drum 17 swings, water tank unit 37 and vibration detection device 40 also vibrate so as to draw an ellipse having rotation center a behind rotary drum 17 as the center.

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

Similarly, when the laundry 60 is offset to the rear side of the rotary drum 17, the rotary drum 17 swings so as to draw an ellipse having the rotation center B of the front side of the rotary drum 17 as the center.

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

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

Fig. 3A is a schematic diagram illustrating the vibration amplitude value detected by the vibration detection unit when there is an unbalance load on the front side in the drum-type washing machine according to embodiment 1. Fig. 3B is a schematic diagram illustrating the vibration amplitude value detected by the vibration detection unit when there is an offset load on the rear side in the drum-type washing machine according to embodiment 1. In fig. 3A and 3B, the front-back direction of the washing machine main body is defined as the X axis and the up-down direction is defined as the Y axis, as in fig. 1. In fig. 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.

The locus of the vibration amplitude value in fig. 3A becomes an ellipse rising rightward. The maximum value of X is defined as Xmax and the minimum value as Xmin. The value of Y when X equals Xmax is defined as Y1, and the value of Y when X equals Xmin is defined as Y2. When there is an unbalance load on the front side of the washing machine, Y1 is larger than Y2.

On the other hand, the locus of the vibration amplitude value in fig. 3B becomes an ellipse rising leftward. Similarly, Y1 and Y2 were determined when there was an offset load on the rear side of the washing machine, and Y1 was smaller than Y2.

Thus, by comparing Y1 and Y2, it can be easily discriminated whether the unbalance load is on the front side or the rear side.

Next, the unbalance determination process will be described with reference to fig. 4.

After a predetermined time has elapsed from the rotational speed of the rotary drum 17 reaching about 800r/min, the determination process is started (S100).

First, as initial values, the control unit 20 sets Xmax to "0" and Xmin to "0". 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). If it is determined in S310 that the acquired value of X is greater than Xmax (yes in S310), the control unit 20 substitutes the value of X for Xmax and the value of Y for Y1(S320), and the process proceeds to S400. In S310, when it is determined that the acquired value of X is not greater than (less 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 acquired X value is smaller than Xmin (S330, yes), the control unit 20 substitutes the X value into Xmin and the Y value into Y2(S340), and the process proceeds to S400. If it is determined in S330 that the acquired value of X is not less than (equal to or greater than) Xmin (S330, no), the process proceeds to S400.

Next, the control unit 20 determines whether or not the elapsed time of the repetitive processing has reached a predetermined time (S400). When determining that the elapsed time of the repetitive processing does not reach the predetermined time (no at S400), the control unit 20 acquires the vibration amplitude value detected by the vibration detection device 40 again (S300), and determines the value X (S310, S330).

When determining that the elapsed time of the repetitive processing has reached the predetermined time (the predetermined time has elapsed) (S400, yes), the control unit 20 compares the values of Y1 and Y2 (S500). If the controller 20 determines that the value of Y1 is greater than the value of Y2 or the value of Y1 is equal to the value of Y2 (no at S500), it determines that the unbalance load is on the front side (S510). Next, the control unit 20 sets the allowable value of the vibration amplitude value to a small allowable value that is a value relatively lower than a predetermined allowable value (S520), and ends the determination process.

Similarly, if the control unit 20 determines that the value of Y1 is smaller than the value of Y2 (S500, yes), it determines that the offset load is on the rear side (S530). Then, the control unit 20 sets the allowable value of the vibration amplitude value to a large allowable value that is a value relatively higher than a predetermined allowable value (S540), and ends the determination process.

The update time (S300 to S400) of the X value and the Y value is preferably set to 1/8 or less of the rotation cycle of the rotary drum 17. Thereby, the accuracy of the determination is ensured.

The predetermined time for the repetition process is preferably set to be longer than the rotation period of the rotary drum 17. By repeating the processing of 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 by the vibration detection device 40 and compares the detected vibration amplitude value with the allowable value. In this case, the maximum value and the minimum value along the X axis, the Y axis, and the Z axis are used as the vibration amplitude values. Similarly, values along the X axis, the Y axis, and the Z axis are set as allowable values.

In the present embodiment, when the vibration amplitude value detected on any one of the X-axis, the Y-axis, and the Z-axis is greater than the allowable value, the control unit 20 determines that the vibration amplitude value is greater than the allowable value. However, the control unit 20 may determine that the vibration amplitude value is larger than the allowable value only when the vibration amplitude value is larger than the allowable value in all of the X-axis, Y-axis, and Z-axis.

The control unit 20 continues the dehydration operation when it is determined that the detected vibration amplitude value is smaller than the allowable value or the detected vibration amplitude value is equal to the allowable value. When determining that the detected vibration amplitude value is larger than the allowable value, the control unit 20 stops the rotation of the rotary drum 17 and shifts from the spin-drying operation to a corrective rinsing operation, which is a corrective operation.

First, water is supplied into the rotary drum 17, and a corrective rinsing operation is performed to loosen the entanglement of the laundry. After the corrective rinsing action is finished, the spinning action is started again.

In addition, when the unbalanced state cannot be released even if the corrected rinsing operation and the dehydrating operation are repeated a predetermined number of times, the control unit 20 notifies an abnormality of the content of the unbalanced state. When the abnormality is notified, the user needs to open the lid 10, take out the laundry in the rotary drum 17, and unwind the laundry. After releasing the winding, the user puts the laundry into the rotary drum 17 to close the lid 10, and resumes the operation via the operation display unit. When the user restarts the operation, the control unit 20 restarts the dehydration operation.

The operation of the determination process 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 the correction operation when the unbalance load is on either the front side or the rear side.

When the detected vibration amplitude value is smaller than the large allowable value and larger than the small allowable value, the control unit 20 performs different processing for the case where the offset load is on the front side and the case where the offset load is on the rear side. That is, when the unbalance load is on the front side, the control unit 20 stops the dehydration operation and performs the correction operation. On the other hand, when the unbalance load is on the rear side, the control unit 20 continues the dewatering operation.

When the offset load is on the front side, there is a possibility that generation of abnormal noise, damage to the shaft 24, and the like may occur. Thus, in the case where the unbalance load is on the front side, it is desirable to correct the unbalance state. On the other hand, when the offset load is on the rear side, the possibility of occurrence of an abnormality is low. Therefore, there are problems such as an increase in the operation time of washing due to the correction rinsing and excessive use of water (an increase in the cost of tap water). Therefore, by setting the allowable value to a relatively high large allowable value, the correction operation is not performed more than necessary.

As described above, the controller 20 can appropriately cope with the unbalanced state by switching the allowable value of the vibration amplitude value based on the position of the unbalance.

As described above, the drum type washing machine of the present disclosure includes: a housing 6; a water tank unit 37 including a water tank 19 supported in a freely swingable manner inside the housing 6; a rotary drum 17 rotatably disposed inside the water tank unit 37, the rotary drum 17 being provided with its rotation axis horizontal or inclined with respect to the horizontal; a drum drive motor 21 disposed inside the housing 6 and configured to rotate the rotary drum 17 around a rotation axis; 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 1 st axis and a 2 nd axis intersecting each other in a side view; and a control unit 20 configured to control the drum drive motor 21 based on the motion information of the water tank unit 37 detected by the vibration detection device 40, and to control the washing operation, the rinsing operation, and the spin-drying operation. The control unit 20 is configured to determine the position of the unbalance of the rotary drum 17 by comparing the motion information of the water tank unit 37 along the other axis different from the one axis when the motion information of the water tank unit 37 along either one of the 1 st axis and the 2 nd axis becomes the maximum value with the motion information of the water tank unit 37 along the other axis when the motion information of the water tank unit 37 along the one axis becomes the minimum value during the spin-drying operation, and to control the drum drive motor 21 based on the determined position of the unbalance of the rotary drum 17.

Thus, the control unit 20 can directly determine the unbalance state from the actual measurement value of the vibration detection device 40. Therefore, the control unit 20 can accurately determine whether the unbalance load is on the front side or the rear side. Therefore, the occurrence of an abnormality due to an unbalance load in the rotary drum 17 can be suppressed with high accuracy.

Further, the control unit 20 may be configured to determine whether the position of the unbalance loading of the rotary drum 17 is the front side of the rotary drum 17 or the rear side of the rotary drum 17 during the spin-drying operation.

This can provide an effect particularly in the dehydration operation at a high rotation speed.

Further, the control unit 20 may be configured to continue the spin-drying operation when the motion information of the water tank unit 37 detected by the vibration detection device 40 is less than or equal to a predetermined allowable value during the spin-drying operation, and to stop the rotation of the rotary drum 17 when the motion information of the water tank unit 37 detected by the vibration detection device 40 is greater than the predetermined allowable value.

This enables different processing according to the detected motion information.

Further, the control unit 20 may be configured to continue the dewatering operation when the motion information of the water tank unit 37 detected by the vibration detection device 40 is less than or equal to a predetermined allowable value during the dewatering operation, and to stop the rotation of the rotary drum 17 when the motion information of the water tank unit 37 detected by the vibration detection device 40 is greater than the predetermined allowable value. Further, the control unit 20 may be configured to set the predetermined allowable value to be relatively smaller than the predetermined allowable value when it is determined that the position of the unbalance loading of the rotary drum 17 is the front side of the rotary drum 17, and to set the predetermined allowable value to be relatively larger than the predetermined allowable value when it is determined that the position of the unbalance loading of the rotary drum 17 is the rear side of the rotary drum 17.

This allows setting an allowable value at which no load is applied to the shaft 24, in accordance with the position of the unbalance load.

Further, the control unit 20 may be configured to stop the rotation of the rotary drum 17 when the motion information of the water tank unit 37 detected by the vibration detection device 40 during the spin-drying operation is larger than a predetermined allowable value, perform a correction operation different from the spin-drying operation, and restart the spin-drying operation after the correction operation is completed.

This enables the correction operation to be performed when the movement information of the water tank unit 37 is larger than a predetermined allowable value.

The 1 st axis may be an axis parallel to the rotation shaft, and the 2 nd axis may be a horizontal axis or an axis parallel to an imaginary line connecting the highest position and the lowest position of the front surface of the rotary drum 17.

Thus, the control unit 20 can determine with higher accuracy whether the unbalance load is on the front side or the rear side.

Further, the laundry may be accommodated inside the rotary drum 17. The control unit 20 may be configured to determine an offset of the laundry stored in the rotary drum 17 as a position of the offset of the rotary drum 17.

This can accurately suppress the occurrence of an abnormality due to the unbalanced loading of the laundry in rotary drum 17.

Further, the control unit 20 may determine the position of the unbalance loading of the rotary drum 17 after a predetermined time has elapsed after the rotational speed of the rotary drum 17 reaches a predetermined rotational speed.

This makes it possible to determine the position of the unbalance load of the rotary drum 17 after the rotational speed of the rotary drum 17 reaches a predetermined rotational speed.

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

This makes it possible to determine the position of the unbalance load in the rotary drum 17 based on the acceleration or vibration amplitude value.

(other embodiments)

As described above, embodiment 1 has been described as an example of the technique disclosed in the present application. However, the technique of the present disclosure is not limited to this, and can be applied to embodiments in which changes, substitutions, additions, omissions, and the like are made.

Therefore, other embodiments are exemplified below.

In embodiment 1, the mounting position of the vibration detection device 40 in the left-right direction is not limited. That is, the vibration detection device 40 may be mounted above the rotation shaft above the water tank unit 37. Further, the vibration detection device 40 may be installed at either of the left and right sides above the water tank unit 37. Further, by mounting the vibration detection device 40 on either of the left and right sides, it is possible to measure vibration amplitude values of all three axes in the front-rear direction, the left-right direction, and the up-down direction.

In embodiment 1, the upper portion of the front side of the water tank unit 37 is described as an example of the mounting position of the vibration detection device 40. However, the vibration detection device 40 may be attached to the water tank unit 37, and the attachment position is not limited to the upper portion of the front side of the water tank unit 37. For example, the mounting position of the vibration detection device 40 may be the upper portion of the rear side of the water tank unit 37, or may be the side portion and the lower portion of the water tank unit 37.

In embodiment 1, as an example of the vibration detection device 40 detecting the movement information of the water tank unit 37, an example of detecting the movement information of the water tank unit 37 along the X axis and the Y axis is described. However, the axis of the vibration detection device 40 detecting the movement information of the water tank unit 37 is not limited to the X axis and the Y axis. For example, the vibration detection device 40 may be configured to detect motion information of the water tank unit 37 along the 1 st axis and the 2 nd axis intersecting each other in a side view.

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

In embodiment 1, the vibration detection device 40 is a triaxial 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 it is a value that is known about the motion of the water tank unit 37, that is, a value that has a correlation with the motion 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 value of the speed. In this case, the control unit 20 may perform the determination process using the value of the speed detected by the vibration detection device 40.

Industrial applicability

The present disclosure can be applied to a drum type washing machine in which laundry is biased during dehydration.

Description of the reference numerals

6. A housing; 10. a cover; 15. a bearing housing; 17. a rotary drum (inner cylinder); 18. a water through hole; 19. a water tank (outer cylinder); 20. a control unit; 21. a drum drive motor (motor); 22. a protrusion plate; 23. a sealing member; 24. a shaft (rotation shaft); 26. a vibration isolating buffer; 27. a water tank cover (outer cylinder); 28. a drum pulley; 29. a transmission belt; 31. a hanging part; 37. a water tank unit (outer tub); 40. a vibration detection device (vibration detection unit); 50. 60, washing.