JP2011045618A - Drum type washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect the vibration of a water tub inexpensively and correctly without needing a circuit such as a noise filter on the basis of the output of an acceleration sensor for detecting vibration. <P>SOLUTION: The drum type washing machine is provided with an acceleration detection means 15 mounted to a water receiving tub 3, and detects the vibration of the water receiving tub 3 by the acceleration detection means 15. When a detected detection value is outside of a first predetermined range, the washing machine performs control to temporarily interrupt the operation of a rotation drum 1. In this case, when the value of difference before/after the output of the acceleration detection means 15 is out of a second predetermined range, the washing machine performs control to detect the vibration of the water receiving tub 3 after excluding the detection value detected when outputting the detection value outside the predetermined range, so that the vibration of the water receiving tub 3 is effectively detected. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a washing machine that detects abnormal vibration in a rotating drum containing laundry, particularly during dehydration.

  Conventionally, in this type of washing machine, the water tank is supported in a suspended state by a suspension structure in the washing machine body. A rotating drum is supported in the water tank while being inclined in the horizontal direction or the inclination direction. The rotating drum is rotationally driven in the forward and reverse directions by a drum motor attached to the back side of the water tank. After the required washing time, the dirty washing liquid is discharged from the drain pipe, and the washing liquid contained in the laundry is dehydrated by a dehydrating operation of rotating the rotating drum at a high speed. When there is uneven distribution of laundry in the dehydration tank or uneven weight distribution of the laundry in the dehydration tank, abnormal vibration may occur in the dehydration tank during dehydration.

  Therefore, vibrations of the dehydration tank are suppressed by performing a vibration detection device including an acceleration sensor that detects the vibration of the dehydration tank and performing dehydration rotation control according to the output of the vibration detection apparatus.

JP 2009-28421 A

  However, the acceleration sensor that detects vibration is likely to disturb the output due to the generation of noise, and it is difficult to accurately detect the vibration. Even if the vibration of the aquarium is within the predetermined range, the noise outputs a value outside the predetermined range. As a result, the vibration of the water tank could not be detected accurately, for example, the dehydration rotation was stopped halfway, although it was not actually a large vibration.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and it is an object of the present invention to accurately detect vibration of a water tank at a low cost without requiring a circuit such as a noise filter.

  In order to achieve the above object, the drum type washing machine of the present invention comprises a rotating drum having a rotation center axis in a horizontal direction or an inclined direction, and the rotating drum is rotatably held in the washing machine body. A water tank, a motor for rotating the rotating drum, an acceleration detecting means attached to the water tank for detecting at least one axis of acceleration in the front-rear direction, the left-right direction, and the vertical direction of the water tank, and the acceleration detecting means And a control means for controlling the operation of washing, rinsing, dehydration or drying based on the detected value, and the acceleration detecting means detects and outputs the vibration of the water tank, and the detected output value is the first value. In a washing machine that controls the operation of the rotating drum to be temporarily interrupted when it is outside the predetermined range of 1, the absolute value of the difference before and after the output value of the acceleration detecting means is a second predetermined range. For is to exclude the output value.

  Thereby, a circuit such as a noise filter is not required, and vibration of the water tank can be detected effectively at low cost.

  The drum type washing machine of the present invention can effectively remove disturbance due to noise of the acceleration detection means, and can effectively detect the vibration of the aquarium at a low cost without requiring a circuit such as a noise filter. In fact, when the vibration is not so great, it is possible to prevent the rotating drum from being stopped halfway, and it is possible to prevent the washing time from being prolonged due to repeated dehydration.

Sectional drawing of the washing machine in Embodiment 1 of this invention Block diagram of a part of the control circuit of the washing machine Diagram of output change of acceleration detection means during normal dehydration rotation of the washing machine Diagram of change in output of acceleration detection means during dehydration rotation when noise is applied to the washing machine Acceleration difference threshold value setting according to the rotational speed of the rotating drum of the washing machine

  A first invention includes a rotating drum having a rotation center axis in a horizontal direction or an inclination direction, a water tank that holds the rotating drum in a washing machine body rotatably, a motor that rotationally drives the rotating drum, An acceleration detection means that can detect at least one axis of acceleration in the front-rear direction, the left-right direction, and the vertical direction of the water tank, and based on the detected value of the acceleration detection means, washing, rinsing, dehydration, or Control means for controlling the drying operation, and the acceleration detecting means detects and outputs the vibration of the water tank and operates the rotating drum when the detected output value is outside the first predetermined range. In the washing machine that controls to temporarily suspend the acceleration, if the absolute value of the difference before and after the output value of the acceleration detecting means is outside the second predetermined range, the output value is excluded to accelerate In addition to effectively removing noise caused by the noise of the detection means, it is possible to effectively detect the vibration of the aquarium at a low cost without the need for a circuit such as a noise filter. In this case, it is possible to prevent the rotating drum from being stopped in the middle, and to prevent the washing time from being prolonged due to repeated dehydration.

According to a second invention, in the first invention, the second predetermined range of the absolute value of the difference before and after the output value of the acceleration detecting means is changed according to the number of rotations of the rotating drum, thereby rotating the rotating drum. As the number rises, the amount of change in acceleration also increases, so the output value due to noise also shows a large value, and the rotational speed increases within the predetermined range of the absolute value of the difference before and after the output value of the acceleration detection means. By setting the predetermined range larger as the rotation speed becomes smaller and setting the predetermined range smaller as the rotation speed becomes smaller, disturbances due to noise can be effectively removed even if the rotation speed of the rotating drum changes, and a circuit such as a noise filter is provided. An embodiment of the present invention that can effectively detect the vibration of a water tank without requiring it and at low cost will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a washing machine according to an embodiment of the present invention.

  As shown in FIG. 1, the rotating drum 1 is formed in a bottomed cylindrical shape, and a large number of water passage holes 2 are provided on the entire surface of the outer periphery, and are rotatably installed in a water receiving tank 3. A rotating shaft 4 is provided in a substantially inclined direction at the rotation center of the rotating drum 1, and the axial center direction of the rotating drum 1 is inclined downward from the front side toward the back side, and clothes are taken in and out from the front lid body 7. Although it is easy to configure the rotating drum, the rotating shaft 4 of the rotating drum 1 may be horizontal.

A motor 5 attached to the rear surface of the water receiving tank 3 is connected to the rotating shaft 4 to drive the rotating drum 1 to rotate in the normal direction or the reverse direction. An opening provided in the upward inclined surface on the front side of the water receiving tub 3 is covered with a lid 7 so as to be freely opened and closed. The lid 7 is opened, and laundry is put into and out of the rotary drum 1 through a clothing entrance 8.

  The water receiving tub 3 is supported by a spring body (not shown) so as to be swingable from the washing machine main body 9 so that the water receiving tub 3 can swing and is connected to one end of the drainage passage 10 at the lower portion of the water receiving tub 3. The end is connected to the drain valve 11 so that the washing water in the water receiving tub 3 is drained. A water supply valve 12 above the washing machine body 9 supplies water into the water receiving tank 3 through a water supply path 13.

  The control device 16 has a control means 17 (see FIG. 2) that drives the motor 5, the water supply valve 12, the drain valve 11 and the like and controls a series of washing steps such as washing, rinsing, and dehydration. Information is transmitted to the input means 18 for setting the driving course and the like disposed on the upper part of the washing machine body 9 and the display means 19 for informing the driving situation.

  Two height adjusting functions 14 are attached to both front lower ends of the substantially square-shaped washing machine body 9, and a screw 14 a is formed on the shaft portion of the washing machine body 9 to rotate the washing machine body 9 up and down. The height can be adjusted.

  As shown in the circuit diagram in which a part of the control circuit in FIG. 2 is made into a block diagram, the control device 16 and the like have a control means 17 composed of a microcomputer. The control means 17 is switched via a switching means drive circuit 20 The means 21 is controlled, the operations of the drain valve 11 and the water supply valve 12 are controlled, and the washing operation and the like are controlled.

  At this time, the control means 17 variably controls the rotational speed of the motor 5 via the inverter drive circuit 23 based on information from the position detection means 22 a, 22 b, 22 c that detect the position of the rotor of the motor 5.

  The acceleration detection means 15 can detect acceleration in at least one axial direction among the three axial directions of the water receiving tank 3 in the front-rear direction (X-axis), the left-right direction (Y-axis), and the vertical (up-down) direction (Z-axis). It is fixed to the upper front of the water receiving tank 3 and mainly detects the vibration of the water receiving tank 3 or the washing machine main body 9 during the dehydration process.

  Since the rotating drum 1 is rotated at a high speed by the motor 5 in the dehydration process of the washing operation, if the laundry becomes unbalanced due to the bias of the laundry in the rotating drum 1, the water receiving tub 3 or the washing machine body 9 vibrates. Becomes larger. This vibration is output by detecting the acceleration of the acceleration detecting means 15. When this output value falls outside the first allowable range (first predetermined range), vigorous vibration and noise are generated, so that the control means 17 stops high-speed rotation of the rotary drum 1. The output value defined in the first allowable range is a range of amplitude values (acceleration values) output from the acceleration detecting means 15.

  FIG. 3 shows changes in the output of the acceleration detecting means 15 during normal dehydration rotation. When the rotating drum 1 rotates as shown in FIG. 3, the acceleration output of the acceleration detecting means 15 also changes periodically as shown in FIG. Based on the amount of change, vibration of the water receiving tub 3 or the washing machine body 9 is detected.

  FIG. 4 shows a change in the output of the acceleration detection means 15 during dehydration rotation when noise is applied to the acceleration detection means 15. When noise is applied as shown in FIG. 4, the output of the acceleration detecting means 15 at the time of noise application may be disturbed and deviate from the normal output value and may become larger. In such a case, it is determined that the output change amount of the acceleration detecting means 15 in one rotation of the rotating drum is larger than normal, and when the output value is out of the first allowable range, the high-speed rotation of the rotating drum 1 is stopped. Will be allowed to. Further, if the noise continues to be applied, the operation of stopping the rotating drum 1 is repeated, and the display means 19 performs an abnormal display.

  Therefore, if the current acceleration value output from the acceleration detecting means 15 exceeds the second allowable range (second predetermined range) set in advance by the absolute value of the difference between the previous acceleration values, The vibration of the water receiving tub 3 or the washing machine main body 9 is detected by excluding the acceleration value. In such a case, since the acceleration value at the time of noise application in FIG. 4 is excluded and vibration is detected, disturbance of the acceleration value due to the noise application can be excluded. The output value defined in the second permissible range is the range of the difference between the amplitude values (acceleration values) output from the acceleration detecting means 15.

  FIG. 5 shows an example of the absolute value of the difference between the normal acceleration values and the second allowable range when the rotation speed of the drum is changed. In FIG. 5, when the drum rotation speed is changed at the time of dehydration, the absolute value of the difference between the acceleration values is relatively increased as the drum rotation speed is increased in a normal state in which no laundry imbalance occurs. Become bigger.

  Therefore, the value of the second allowable range (second predetermined range) of the absolute value of the difference between the current acceleration value and the previous acceleration value output from the acceleration detecting means 15 is rotated as shown in FIG. By changing according to the number of rotations of the drum 1, it is possible to more effectively eliminate disturbance of the acceleration value due to noise application. In FIG. 5, the value of the second permissible range (second predetermined range) is about 2.5 times the number of revolutions of the drum (about 2.5 times the absolute value of the difference between normal acceleration values). ) Is set. This is because, as shown in FIG. 5, as the rotational speed of the rotating drum increases, the amount of change in acceleration also becomes relatively large. Therefore, when the absolute value of the difference between the acceleration values exceeds the second allowable range, it is considered that normal noise has been applied, and if the output value is excluded, the dehydration start is unnecessarily repeated and the dehydration time is Can be prevented from being prolonged.

  As described above, the washing machine according to the present invention can effectively remove the disturbance caused by the noise of the acceleration detecting means and can effectively detect the vibration of the water tank. It can also be applied to other uses.

1 Rotating drum 3 Water receiving tank (water tank)
4 Rotating shaft 5 Motor 9 Washing machine body 15 Acceleration detecting means 16 Control device 17 Control means

Claims (2)

A rotating drum having a rotation center axis in a horizontal direction or an inclined direction, a water tub that holds the rotating drum in the washing machine main body rotatably, a motor that rotationally drives the rotating drum, a front-rear direction of the water tub, Acceleration detecting means that can detect at least one axis of acceleration in the left-right direction and up-down direction, and that controls the washing, rinsing, dehydration, or drying operation based on the detected value of the acceleration detecting means attached to the water tank. Control means, wherein the acceleration detection means detects and outputs the vibration of the water tank, and temporarily stops the operation of the rotating drum when the detected output value is outside the first predetermined range. In the washing machine to be controlled, the drum type washing machine is characterized in that the output value is excluded when the absolute value of the difference before and after the output value of the acceleration detecting means is outside the second predetermined range. 2. The drum type washing machine according to claim 1, wherein the second predetermined range of the absolute value of the difference between before and after the output value of the acceleration detecting means is changed according to the number of rotations of the rotating drum.