JP2008307421A - Washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a washing machine capable of preventing drying irregularities due to lack of loosening and wrinkling due to too much agitation or the like by appropriately determining the execution time of a blade rotating operation when executing drying by the repetition of a tub rotating operation and the blade rotating operation. <P>SOLUTION: The washing machine includes an operation control means for acquiring an index value reflecting the load applied to a motor during rotary drive every time of inverting the rotating direction of an agitating body in an agitating rotating operation and controlling a drive control means so as to repeat an inverting operation until the index value becomes a prescribed value or is settled in a prescribed range. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vertical washing machine provided with a laundry dewatering tub whose upper surface is open so as to be rotatable about a vertical or inclined axis. In addition, the washing machine said here also includes the washing-drying machine provided with the drying function by a warm air.

  In a general vertical automatic washing machine, a bottomed cylindrical outer tub is suspended and supported by a vibration-absorbing suspension rod. Inside the outer tub, there are a number of dewatering holes in the same shape with a bottomed cylinder. A washing and dewatering tank having a perforated hole is rotatably arranged around a vertical or inclined shaft, and a stirring pulsator (stirring blade) is rotatably provided on the inner bottom of the tank.

  In recent years, such washing machines equipped with heaters and fans and have a full-fledged drying function have been commercialized, but in order to dry relatively easy-to-dry laundry such as relatively small amounts of laundry and synthetic fibers. A washing machine equipped with a simple drying function is also known. In simple drying, first, a tank rotating operation is performed in which the laundry dewatering tank and the stirring blade are integrally rotated at a relatively high rotational speed, for example, the rotational speed at the time of dewatering. At this time, outside air is introduced into the laundry dewatering tank, and this outside air is applied to the laundry to promote evaporation of moisture from the laundry. If this tank rotation operation is carried out for a certain period of time, the tank rotation operation is terminated, and this time, the blade rotation operation is performed by rotating the stirring blade while reversing left and right at a relatively low speed with the washing and dewatering tank stopped. Do. By this blade rotation operation, the laundry stuck to the inner wall of the laundry dewatering tank is dropped and loosened during the tank rotation operation. The laundry can be dried by repeating such a tank rotation operation and a blade rotation operation a plurality of times (see Patent Document 1).

  Even when performing the simple drying operation as described above, the laundry swells with air as the drying progresses. During the rotation of the tub, the laundry sticks to the inner wall of the laundry dehydration tank due to centrifugal force, but when the swelled laundry is agitated during the wing rotation, a part of the laundry protrudes from the upper edge of the laundry dehydration tub. It may get into the gap with the tank. If the next tank rotation operation is executed in such a state, the protruding laundry may be damaged, or the cloth may be broken in some cases. For example, if the laundry is in a state of being bitten and the rotational speed of the laundry dewatering tub does not increase, it can be determined that the state is abnormal based on the detection result of the rotational speed. However, in general, the rotation speed of the laundry dewatering tub increases as usual even if there is some protrusion of the laundry, so it is impossible to detect the abnormal state as described above by detecting the rotation speed. is there.

In the conventional washing machine, the time for the blade rotation operation is set in advance during the drying operation as described above. However, the ease of sticking to the inner wall of the laundry dewatering tub varies depending on the quality of the laundry, etc. The laundry may get tangled and cause wrinkles.
JP 2005-13376 A

  The object of the present invention is to perform drying by repeating the tank rotation operation and the blade rotation operation, by appropriately determining the execution time of the blade rotation operation, thereby causing uneven drying and excessive stirring due to insufficient loosening. It is an object of the present invention to provide a washing machine that can prevent wrinkles caused by the above.

The washing machine according to the present invention includes a laundry dewatering tub that is rotatably provided in the outer tub, an agitator that is rotatably provided in the laundry dewatering tub, and the laundry dewatering tub and the agitator that are driven to rotate. Rotating drive means including a motor for driving, and a drive control means for controlling the rotation of the motor, and rotating the washing / dehydrating tub and the agitator in one direction at a high speed integrally. And a washing machine that performs a drying process of drying the laundry in the laundry dewatering tub by repeating the stirring rotation operation in which only the stirring body is rotated in the left and right rotation directions,
Each time the rotation direction of the stirring body is reversed during the stirring rotation operation, an index value that reflects the load applied to the motor being rotated is acquired, and the reversing operation is performed until the index value reaches a predetermined value or falls within a predetermined range. Operation control means for controlling the drive control means so as to repeat the above.

  According to the washing machine according to the present invention, the loosening of the laundry is appropriately performed during the stirring rotation operation, so that unevenness in drying due to insufficient unraveling can be reduced, and the fabric is damaged or wrinkled due to excessive stirring of the laundry. It is also effective in preventing

  Hereinafter, an embodiment of a washing machine according to the present invention will be described with reference to FIGS. FIG. 1 is a right side longitudinal sectional view showing the overall configuration of the washing machine of the present embodiment.

  Inside the outer box 1 having the laundry input port 2 formed on the upper surface, a bottomed cylindrical outer tub 4 is provided with a hanging bar 5 (one in each of the front and rear in FIG. 2), and the vibration of the outer tub 4 is prevented from being transmitted to the outer box 1. The laundry input port 2 can be freely opened and closed by an upper lid 3 that can be folded in two when standing. Inside the outer tub 4, a washing / dehydrating tub 6 having a large number of water passage holes 7 on the peripheral wall is pivotally supported around a substantially vertically extending tub shaft 8 fixed to the center of the bottom surface of the bottom wall. ing. A pulsator (corresponding to a stirring body in the present invention) 9 for stirring the laundry is provided at the inner bottom of the laundry dewatering tub 6 so as to be rotatable around a blade shaft 10 fitted inside the tub shaft 8. ing.

  A drive mechanism (corresponding to a part of the rotational drive means in the present invention) 11 for driving the washing and dewatering tub 6 and the pulsator 9 is provided at the bottom of the outer tub 4. This drive mechanism 11 transmits a motor 12 which is a DC brushless motor provided coaxially with the tank shaft 8 and the blade shaft 10, and transmits the rotational driving force of the motor 12 only to the blade shaft 10, or the blade shaft 10 and the tank A clutch mechanism 13 that switches between transmission to both of the shafts 8 and a speed reduction mechanism 14 that reduces the rotational speed at a predetermined reduction ratio when transmitting the rotational driving force of the motor 12 only to the blade shaft 10 are included. The clutch mechanism 13 separates the tank shaft 8 and the blade shaft 10 so that only the pulsator 9 can be rotated in one direction or both directions by the operation of the torque motor 16 attached below the bottom surface of the outer tub 4, or The tank shaft 8 and the blade shaft 10 are connected so that the water tank 6 and the pulsator 9 can rotate integrally in one direction. Further, when the tank shaft 8 and the blade shaft 10 are separated from each other, the rotation of the tank shaft 8 is stopped by the band brake mechanism 15.

  On the upper rear side of the outer tub 4, there is provided a water injection port 17 having a detergent container and a soft finish container for putting in detergent or the like housed therein. A water supply port 18 connected to an external water tap or the like via a hose is provided on the rear upper surface of the outer box 1, and a water supply pipe 19 connected to the water supply port 18 is connected to the water injection port portion 17 via a water supply valve 20. It is connected. When the water supply valve 20 is opened, tap water supplied from the water tap flows into the water inlet 17 through the water supply pipe 19, and water is discharged from the water inlet 17 toward the lower outer tank 4. By storing the detergent in a predetermined place in the detergent container in advance, the detergent can be mixed into the water discharged into the outer tub 4, and thus the detergent can be automatically introduced. In this washing machine, a bath water pump is provided as another means for supplying water into the washing and dewatering tank 6, but the description thereof is omitted here.

  A drainage port 21 is provided at the bottom of the outer tub 4, and a drainage pipe 22 connected to the drainage port 21 is opened and closed by a drainage valve 23. The opening / closing operation of the drain valve 23 is interlocked with the operation of the clutch mechanism 13 (that is, the operation of the torque motor 16), and the pulsator 9 is separated from the washing / dehydrating tub 6 and can be rotated independently (the washing / dehydrating tub 6). The drain valve 23 is closed when the rotation is restricted by the band brake mechanism 15, and the drain valve 23 is opened when the pulsator 9 and the washing and dewatering tub 6 can rotate together.

  A circulation water channel 26 having openings at the upper and lower ends is formed on the inner wall surface of the laundry dewatering tub 6, and a water passage 27 is provided on the bottom wall surface of the laundry dewatering tub 6 below the pulsator 9. When the pulsator 9 is rotationally driven in a state where an appropriate amount of water is stored in the outer tub 4, the outer wall of the washing / dehydrating tub 6 is separated from the bottom wall of the washing / dehydrating tub 6 through the water outlet 27 by the pumping action of the back blade provided on the back surface of the pulsator 9 Water between the bottom wall of the tank 4 is sucked into the washing / dehydrating tank 6 and fed into the lower end opening of the circulation water channel 26. The water ascends in the circulation water channel 26 and is discharged into the washing and dewatering tub 6 through a lint filter 28 provided on the upper portion thereof. As a result, lint and dust floating in the water are collected.

  In addition, a vibration detection lever 29 connected to a vibration detection switch 47 described later is installed in the gap between the outer tank 4 and the outer box 1, and this is mechanically detected when the outer tank 4 swings abnormally greatly. Swing can be detected. Further, although not shown, an air trap is formed at the bottom of the outer tub 4 and the other end of the air hose connected to the air trap is connected to a water level sensor 46 described later. Thereby, the water level of the water stored in the washing and dewatering tank 6 can be detected. An operation panel 30 is provided on the front side of the upper surface of the outer box 1, and a circuit unit 31 including an electric board on which various electric components are mounted is disposed below the operation panel 30.

  The configuration of the drive mechanism 11 will be described in detail with reference to FIG. An upper bearing case 51 that opens downward is integrally provided on a metal motor mounting base 50 that is attached to the bottom of the outer tub 4, and a lower bearing case 52 that opens upward is provided below the upper bearing case 51. It is fixed to the mounting base 50. An upper bearing 53 and an oil seal 54 are provided in the upper portion of the upper bearing case 51, and the tank shaft 8 is instructed to be watertight and rotatable through these. A gear case including an upper gear case 55 and a lower gear case 56 is fixed to the lower end of the tank shaft 8, and a gear mechanism 57 that functions as the speed reduction mechanism is accommodated in the gear case. Has been. The gear mechanism 57 is for reducing the driving force applied through the driving shaft 58 having the rotor 122 of the motor 12 fixed to the lower end thereof at a predetermined reduction ratio and transmitting the driving force to the blade shaft 10. A lower bearing 59 is provided in the lower portion of the lower bearing case 52, through which the gear case is instructed to be rotatable. That is, the tank shaft 8, the upper gear case 55, and the lower gear case 56 are integrally supported by the upper bearing 53 and the lower bearing 59 so as to be rotatable.

  The motor 12 is a so-called outer rotor type motor, and is fixed to the lower part of the stator 121, the rotor 122 disposed on the outer peripheral side so as to surround the stator 121, and the lower bearing case 52, and holds the stator 121 and the clutch mechanism 13. And a stator fixing base 123 containing the. The rotor 122 to which the drive shaft 58 is fixed has a bottomed flat cylindrical shape, and a plurality of magnets 124 are arranged along the rotation direction so as to face the stator 121 inside the peripheral wall. Further, at a plurality of locations on the back side of the top surface of the stator fixing base 123 (only one location appears in FIG. 2), a Hall element that detects the rotational position of the rotor 122 by detecting the magnetic force of the magnet 124 of the rotor 122. 125 is attached.

  The clutch mechanism 13 is provided at the lower end of the drive shaft 58, and has an outer diameter that is substantially the same as the outer diameter of the lower end of the lower gear case 56, and from the clutch wheel 60 to the lower end of the lower gear case 56. A clutch spring 61 wound around the outer periphery of the clutch spring 61, a hook wheel 62 provided around the clutch spring 61 and engaged with the lower end of the clutch spring 61, and an engagement / disengagement of the pinion wheel 62. A claw portion 63 includes a clutch lever 64 provided at the tip. The clutch lever 64 is rotatably supported around a vertically extending clutch shaft 65, and is urged by a coil spring 66 in a direction in which the claw portion 63 is engaged with the claw wheel 62.

  The band brake mechanism 15 includes a brake band 67 wound around the outer peripheral surface of the upper gear case 55 that is a brake drum surface, and a brake lever 68 for tightening or loosening the brake band 67. The brake lever 68 is rotatably supported on the clutch shaft 65 at a position above the clutch lever 64 in the same manner as the clutch lever 64. The brake lever 68 and the clutch lever 64 are connected to the torque motor 16 by a connecting member or a wire (not shown), and operate in conjunction with the torque motor 16.

  When the torque motor 16 that is the driving source is not energized, the claw portion 63 of the clutch lever 65 is engaged with the claw wheel 62. For this reason, the lower end side of the clutch spring 61 is displaced in the expanding direction, and the clutch wheel 60 and the lower end portion of the lower gear case 56 are not coupled. Therefore, the rotational driving force of the motor 12 is not transmitted to the tank shaft 8 but is transmitted only to the blade shaft 10. At this time, the brake band 67 is fastened by the brake lever 68, and the upper gear case 55, that is, the washing and dewatering tub 6 is fixed by the braking force of the band brake mechanism 15.

  In the above state, since the rotational driving force of the motor 12 is transmitted from the driving shaft 58 to the blade shaft 10 via the gear mechanism 57, that is, the speed reduction mechanism 14, the washing / dehydrating tub 6 does not rotate and only the pulsator 9 rotates. Rather, it is rotationally driven in the same direction at a rotational speed reduced by a predetermined reduction ratio. Such rotation drive is used in a washing operation or rinsing operation in which water is stored in the washing / dehydrating tub 6 or a blade rotation process during air drying described later.

  When the torque motor 16 is energized, the torque motor 16 operates to wind up a wire (not shown), whereby the clutch lever 64 rotates in a direction against the urging direction of the coil spring 66, and the claw portion 63 is moved. Detach from claw wheel 62. As a result, the displacement of the clutch spring 61 is released, and the clutch wheel 60 and the lower end of the lower gear case 56 are coupled by tightening the clutch spring 61. Accordingly, the rotational driving force of the motor 12 is directly transmitted to both the tank shaft 8 and the blade shaft 10. When the clutch lever 64 is rotated, the brake lever 68 is also rotated through a connecting member (not shown), and the brake band 67 is loosened. Thereby, the braking force by the band brake mechanism 15 is released, the fixation of the washing and dewatering tub 6 is released, and a state where the washing and dewatering tub 6 can freely rotate is set.

  In the above state, the rotational driving force of the motor 12 is transmitted from the drive shaft 58 to the lower gear case 56, the upper gear case 55, and the tank shaft 8, and is also transmitted directly from the upper gear case 55 to the blade shaft 10 via the gear mechanism 57. The laundry dewatering tub 6 and the pulsator 9 are integrally driven to rotate in the same rotational speed and rotational direction as the motor 12. Such rotation drive is used during the dehydration and the tank rotation process during air drying described later.

  Next, the configuration of the electric system of the washing machine of this embodiment will be described with reference to FIG. FIG. 3 is an electric system configuration diagram of a main part of the washing machine of the present embodiment.

  At the center of control is a main control unit (corresponding to load amount estimation means, abnormality determination means, abnormality response means, and operation control means in the present invention) 40 including a CPU, RAM, ROM, timer, and the like. ing. The main control unit 40 receives a key signal from an operation unit 43 having a plurality of operation keys such as a course selection key and a start key, and a lid opening / closing signal linked to opening / closing of the upper lid from the upper lid switch 45, and a water level sensor 46 to the outer tub. A vibration detection signal generated when a water level detection signal corresponding to the water level of water stored inside 4 detects a large swing of the outer tub 4 from the vibration detection switch 47 is input. The main control unit 40 controls the opening / closing operation of the water supply valve 20, the operation of the bath water pump 48, and the operation of the torque motor 16 via the load driving unit 41. As described above, the torque motor 16 achieves the connecting / disconnecting operation of the clutch mechanism 13, the braking / releasing of the washing / dehydrating tub 6 by the band brake mechanism 15, and the opening / closing operation of the drain valve 23. Furthermore, the main control unit 40 causes the display unit 44 to display the key input acceptance state of the operation unit 43 and the progress of washing, and a buzzer as necessary to alert the user (the present invention). (Corresponding to the abnormality handling means and abnormality notifying means) in FIG.

  In addition, an inverter circuit 70 is provided to drive the motor 12. The inverter circuit 70 includes an AC / DC conversion circuit 71 that converts AC power into DC power, a switching circuit 72 that includes a plurality of switching elements that switch a DC current to supply a three-phase AC current to the motor 12, and a PWM signal that will be described later. A motor control unit (including a drive unit 73 that drives the power and supplies the switching device to each switching element, and outputs a PWM signal for turning on / off each switching element of the switching circuit 72 while communicating with the main control unit 40) 74 corresponding to the drive control means in the present invention), and a rotation detector 75 (corresponding to the speed detection means in the present invention) 75 that includes the Hall element 125 described above and generates a pulse signal synchronized with the rotation of the motor 12. The motor control unit 74 controls the drive power applied to the motor 12 by adjusting the ratio of on (signal level “H”) time within one cycle of ON / OFF of each pulse of the PWM signal, that is, the duty ratio. Therefore, if the duty ratio is increased (that is, close to 100%), the torque of the motor 12 is increased, and if the duty ratio is decreased (that is, close to 0%), the torque of the motor 12 is decreased.

  FIG. 4 is a plan view showing a part of the operation panel 30. The operation panel 30 is provided with an air drying selection key 301 for selecting an air drying course as shown in FIG. 4 in addition to a power key, a start key, a course selection key for a washing course, and the like as operation keys. ing. In addition, an LED display group 302 including four LEDs for displaying the content of the air drying course selected by the air drying selection key 301 is provided. When the air drying selection key 301 is not pressed, all the LEDs in the LED display group 302 are turned off. At this time, the final final dehydration process is performed after the final rinse process is completed.

  On the other hand, when the wind drying selection key 301 is pressed to select the wind drying course, the LEDs of the LED display group 302 are turned on, and the final dehydration process is switched to the blow drying process. In addition, as a wind drying course, any of four drying times of “3.5 hours”, “2 hours”, “1 hour”, and “30 minutes” can be selected. Each time the button is pressed, the selection of the drying time is switched. The blow drying process is performed at a high rotational speed similar to the final dehydration process, and the laundry dewatering tub 6 is rotated at a high speed that is similar to or close to the speed during dehydration for a very long time than the final dehydration process. The laundry is dried by wind generated by rotation. However, since the laundry sticks to the inner wall of the washing and dewatering tub 6 during high-speed rotation, the surface of the laundry that is well hit by the wind is easy to dry, but the inside of the overlapping laundry is difficult to dry. Therefore, in order to replace or loosen the position of the laundry, in the blow drying process, the washing / dehydrating tub 6 is sometimes stopped halfway, and the blade rotation process is performed to rotate the pulsator 9 and stir the laundry. I have to. This point will be described in detail later.

  The feature of the washing machine of the present embodiment is the control operation in the above-described air drying process. Next, this control operation will be described with reference to the flowcharts of FIGS.

When the blow drying process is started, the main control unit 40 first executes a tank rotation process (tank rotation operation) (step S10). That is, the torque motor 16 is turned on to switch the clutch mechanism 13 so that the washing and dewatering tub 6 and the pulsator 9 can rotate integrally, and then the motor 12 is energized to start the motor 12 (step S12). ). As a result, the washing and dewatering tank 6 and the pulsator 9 start to rotate together. At the time of starting, the main control unit 40 acquires the duty ratio of the PWM signal from the motor control unit 74 and stores it as the initial duty ratio D ₀ (step S14).

Then, the main control unit 40 determines a load amount which is the weight of the wet laundry contained in the washing / dehydrating tub 6 according to the initial duty ratio D ₀ (step S16). That is, the larger the load amount, the greater the duty ratio because a larger starting torque is required when the rotation of the washing / dehydrating tub 6 is started. Therefore, the load amount can be determined in any one of a plurality of stages depending on which of the plurality of predetermined ranges the value of the duty ratio. Next, it is determined whether or not the load amount is excessive (step S18). If it is determined that the load amount is excessive, the laundry dewatering tub 6 is increased when the volume of the laundry is increased in the blow drying process. Therefore, the operation is stopped (step S22), the buzzer 49 is sounded, and a predetermined display is displayed on the display unit 44 to notify the abnormality (step S24).

If the load amount is not excessive, it is next determined whether or not the load amount is large (step S20). When the load amount is large, the operation is continued while suppressing the maximum rotation speed at the time of the tank rotation, although it is not enough to stop the operation (step S26). For example, when the standard maximum rotation speed is 900 rpm, the maximum rotation speed is set to 600 rpm. However, when the maximum rotation speed is lowered here, the specified time described later is increased (for example, 30 minutes → 45 minutes). Thereafter, the laundry dewatering tub 6 is raised to the maximum rotation speed (step S28), and control is performed so as to maintain this rotation speed. The main control unit 40 in this state, obtains the duty ratio from the motor controller 74, and stores it as constant duty ratio D ₁ (step S30).

Next, based on the load amount estimated in step S16, a range of a steady duty ratio suitable for rotating the load amount at a high speed is obtained. This can be obtained by reading necessary data from a table previously determined at the time of factory shipment. The constant duty ratio D ₁ obtained by actual measurement before it is determined whether or not fall within the above range (step S32), if it is determined to be abnormal if departing from the scope (YES in step S34 ). For example, when the laundry protrudes from the upper edge of the laundry dewatering tub 6 and an abnormality occurs between the outer tub 4 and the laundry dewatering tub 6, this increases the load on rotation. Since the torque required for steady operation is larger than that when there is no abnormality, the duty ratio is also increased. As a result, the actually measured duty ratio becomes so large that it does not match the load amount, and therefore it is determined in step S34 that it is abnormal. If it is determined that there is an abnormality, the operation is stopped as in steps S22 and S24 (step S40), the buzzer 49 is sounded and a predetermined display is given to notify the abnormality (step S42). Thereby, it can avoid that a driving | running | working continues in the state where the laundry was pinched | interposed between the outer tub 4 and the washing | cleaning dehydration tank 6, for example.

If it is determined that there is no abnormality in step S34, it is then determined whether a specified time (for example, 30 minutes) has elapsed since the start of the tank rotation stroke (step S36), and if it has not yet elapsed, the process returns to step S30. repeating the determination of the presence or absence of the acquisition constant duty ratio D ₁ as described above and abnormality based thereon. Then, if the specified time has elapsed, the energization to the motor 12 is stopped (step S38), and the tank rotation process is temporarily ended. In this tank rotation process, first, the laundry is dehydrated by centrifugal force due to high-speed rotation, and after a certain amount of time has passed, the water does not scatter from the laundry. Water vapor comes out of the laundry by hitting. At this time, the laundry is attached to the inner wall of the washing / dehydrating tub 6 by centrifugal force, the inner surface portion where the wind hits well dries well, and the surface in contact with the inner wall of the washing / dehydrating tub 6 is difficult to dry. .

  Then, the blade rotation (corresponding to the stirring rotation in the present invention) stroke, that is, the loosening stroke is shifted to (step S44). The purpose of the wing rotation process is to peel the laundry stuck to the inner wall of the laundry dewatering tub 6 and to change its position (up and down or inside and outside) while loosening the laundry by stirring the laundry. In the blade rotation stroke, the main control unit 40 first determines an end determination range U, which will be described later, according to the previously detected load amount (step S46). In addition, after the washing and dewatering tub 6 is completely stopped, the clutch mechanism 13 is switched by the torque motor 16 to separate the tub shaft 8 and the blade shaft 10 so that only the pulsator 9 is rotationally driven.

Then, the main control unit 40 intermittently energizes the motor 12 via the motor control unit 74 and rotates the pulsator 9 in the left-right direction (step S48). Every time the rotation direction of the pulsator 9 is reversed, the duty ratio _Dt is acquired from the motor control unit 74 at least once during the rotation period (step S50). Then, it is determined whether or not the acquired duty ratio _Dt is within the previously determined end determination range U (step S52). When the amount of load, that is, the amount of laundry is small, the laundry rises and does not easily hit the pulsator 9 if the laundry is not loosened. Therefore, the pulsator 9 often rotates in an idle state. Similarly, when the laundry is stuck to the inner wall of the laundry dewatering tub 6 and is not peeled off, the state becomes similar to the idle state. In such a case, since the torque can be small, the duty ratio _Dt is small. Then, the laundry and comes proceeds loosening the laundry tends duty ratio D _t hit the pulsator 9 is increased.

On the other hand, when the load amount, that is, the amount of laundry is large, if the laundry is not unraveled, the laundry that is hardened by the weight from above often hits the pulsator 9, so a large torque is required and the duty ratio _Dt is large. . As the laundry loosening progresses, the amount of laundry hitting the pulsator 9 decreases, and the duty ratio _Dt decreases. Therefore, by previously suitably determined range U determines the duty ratio D _t in accordance with the load as described above, the blade rotation process when the laundry regardless of the load amount becomes the loosened state Can be terminated. This can prevent uneven drying due to lack of loosening, and is also effective in reducing the damage to the laundry caused by excessive agitation and the generation of wrinkles due to entanglement.

However, since it is unavoidable that variations in the loosening condition due to the duty ratio due to differences in the quality of the laundry and the drying condition, even if it is determined that the duty ratio _Dt is within the range U, the predetermined lower limit time (Step S56), the blade rotation process is continued. When the lower limit time has elapsed, the energization to the motor 12 is stopped and the left-right reversal is terminated (step S58). Meanwhile, in order to prevent the execution time of the blade rotation process is abnormally prolonged, when the predetermined upper limit time has elapsed (YES at step S54), even though the duty ratio D _t is within the range U to the motor 12 The energization is stopped and the left-right reversal is ended (step S58). Note that the maximum rotation speed of the pulsator 9 at this time is lower than the rotation speed that is easy to wash, and does not damage the laundry even in the absence of water, for example, about 120 rpm.

  As the pulsator 9 rotates during the blade rotation process, the laundry stuck to the inner wall of the laundry dewatering tub 6 is peeled off and stirred to loosen the laundry appropriately and change its position. When the process is executed, the surface of the laundry stuck to the washing / dehydrating tank 6 is different from that in the previous tank rotation process.

  When the blade rotation process is completed, the tank rotation process is performed again (step S60). That is, the torque motor 16 is turned on to switch the clutch mechanism 13 so that the washing and dewatering tub 6 and the pulsator 9 can rotate integrally, and then the motor 12 is energized to start the motor 12 (step S62). ). As a result, the washing and dewatering tank 6 and the pulsator 9 start to rotate together. Then, the main control unit 40 starts up the washing / dehydrating tub 6 to the maximum rotation speed (YES in step S64), and controls to maintain this rotation speed.

The main control unit 40 in this state, obtains the duty ratio of the PWM signal from the motor controller 74, and stores it as constant duty ratio D _n (step S66). Here, n represents the number of executions of the tank rotation process in one blow drying process, and the second tank rotation after the blade rotation process (FIG. 6) immediately after the first tank rotation process (FIG. 5) is completed. For the stroke, n = 2. If the specified time for one tank rotation process is 30 minutes, n is a maximum of 2 for a drying course of 1 hour, and n is a maximum of 4 for a drying course of 2 hours.

If the main control unit 40 obtains the latest steady duty ratio D _n in step S66, the main control unit 40 determines whether or not the value is equal to or less than the value of the steady duty ratio D _n-1 measured during the previous tank rotation stroke. Determination is made (step S68). The laundry will dry as the tank rotation process proceeds, and its weight should gradually become smaller. Therefore, if there is no particular problem, the steady duty ratio D _n is usually smaller than D _n−1 . Therefore, conversely, when the steady duty ratio D _n is larger than D _n −1, there is a high possibility that the rotation load is increased due to another factor than the weight of the laundry is decreased. Can be assumed. That is, when the laundry protrudes from the upper edge of the washing / dehydrating tub 6 and is sandwiched between the washing / dehydrating tub 6 and the outer tub 4 between the immediately preceding blade rotation stroke and the current tank rotation stroke. Is a typical case. Therefore, if D _n is not equal to or less than D _n −1 in step S68, the operation is stopped and abnormality notification by the buzzer 49 or display is executed in order to prevent the laundry from being damaged (steps S70 and S72).

If it is determined in step S68 that D _n is equal to or less than D _n−1 , it can be determined that there is no abnormality, and it is then checked whether the execution timing of the blade rotation stroke has arrived (step S74). When the tank rotation process is continued for 30 minutes as described above, it is determined whether or not 30 minutes have elapsed since the start of the process. If it is not yet the execution timing of the blade rotation stroke, it is next determined whether or not automatic drying is set (step S76). When the automatic drying setting is not made, that is, when the operation end timing is determined only by the time, it is determined whether or not the operation time of the entire blast drying process has ended (step S78). Here, if the operation time has not yet ended, the process returns to step S66, and the acquisition of the steady duty ratio and the detection of the abnormality by the determination are repeated.

On the other hand, when the automatic drying is set, the process proceeds from step S76 to S80, and the duty ratio _DN is acquired again. Here, N is the same as n. Then, a difference ΔD (= | D1−D _N |) between the latest duty ratio D _N and the duty ratio D ₁ stored at the time of the first tank rotation stroke is obtained, and the laundry is determined according to the difference ΔD. Determine the degree of drying. That is, as the degree of drying progresses, the weight of the laundry becomes smaller and the torque for rotating at the same rotational speed can be reduced. Therefore, it can be determined that the degree of drying progresses as ΔD increases. Therefore, it is determined whether or not the degree of drying has reached a predetermined state (step S84). If the prescribed degree of drying has not yet been reached, the process returns to step S66 to continue the tank rotation process. In the case of automatic drying, when it is determined in step S84 that the specified degree of drying has been reached, on the other hand, if it is not automatic drying, the motor 12 is determined when it is determined in step S78 that the operation time has ended. Is turned off (step S86), and the blow drying process is terminated.

  If it is determined in step S74 that the blade rotation execution timing has come, the tank rotation process is terminated, the process returns to step S44, and the blade rotation process is executed again. In this manner, the tank rotation process and the blade rotation process are repeated a plurality of times, and when the set time (for example, 1 hour, 2 hours, or 3.5 hours) elapses, the blow drying process is terminated.

  As described above, according to the washing machine according to the present embodiment, the protrusion of the laundry from the upper edge of the washing / dehydrating tank 6 can be detected quickly and reliably during the tank rotation process of the blow drying process. The laundry can be prevented from being damaged by stopping the operation and reporting the abnormality. Alternatively, by lowering the maximum rotation speed and extending the execution time of the tank rotation process, drying can be continued and finished in a desired dry state while suppressing damage to the laundry. Further, by performing appropriate loosening during the blade rotation stroke, it is possible to reduce drying unevenness and avoid wrinkles due to excessive stirring.

  It should be noted that the above embodiment is merely an example, and it is obvious that even if changes, modifications, and additions are made as appropriate within the scope of the present invention, they are included in the scope of the claims of the present application.

  For example, in the washing machine according to the above embodiment, the tank rotation process, which is the process of drying the laundry, rotates the laundry dewatering tank 6 at a high speed and dewaters it by centrifugal force, thereby entering the laundry dewatering tank 6 from the outside. It is supposed that the laundry is dried by the wind that is taken in and created. However, the washing machine according to the present invention may have a configuration in which, for example, a blower fan or a heater is provided and warm air is fed into the washing and dewatering tub 6. In the case of a configuration in which a blower fan is provided and air (cold air or hot air) is forcibly sent to the washing / dehydrating tub 6, the washing / dehydrating tub 6 may not be rotated at a higher speed as it is closer to dehydration. In the above embodiment, the duty ratio of the PWM signal for inverter control is used as an index value reflecting the load applied to the motor 12, but other index values such as a current value supplied to the motor 12, Alternatively, the same control can be performed by using various index values reflecting the load applied to the motor 12, such as the inertial rotation continuation time and the deceleration speed when the motor 12 is de-energized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side sectional view showing an overall configuration of a washing machine according to an embodiment of the present invention. The block diagram of the drive mechanism in the washing machine of a present Example. The electric system block diagram of the principal part of the washing machine of a present Example. The top view which shows a part of operation panel of the washing machine of a present Example. The flowchart of the ventilation drying process in the washing machine of a present Example. The flowchart of the ventilation drying process in the washing machine of a present Example. The flowchart of the ventilation drying process in the washing machine of a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Outer box 2 ... Laundry insertion port 3 ... Upper lid 4 ... Outer tub 5 ... Hanging rod 6 ... Laundry dehydration tub 7 ... Water passage hole 8 ... Tank shaft 9 ... Pulsator 10 ... Blade shaft 11 ... Drive mechanism 12 ... Motor 121 ... Stator 122 ... Rotor 123 ... Stator fixing base 124 ... Magnet 125 ... Hall element 13 ... Clutch mechanism 14 ... Deceleration mechanism 15 ... Band brake mechanism 16 ... Torque motor 17 ... Water injection port 18 ... Water supply port 19 ... Water supply pipe 20 ... Water supply Valve 21 ... Drain port 22 ... Drain pipe 23 ... Drain valve 26 ... Circulating water channel 27 ... Water vent 29 ... Vibration detection lever 30 ... Operation panel 31 ... Circuit unit 40 ... Main control unit 41 ... Load drive unit 43 ... Operation unit 44 ... Display 45 ... Upper lid switch 46 ... Water level sensor 47 ... Vibration detection switch 48 ... Bath water pump 49 ... Buzzer 50 ... Motor mount 51 ... Upper bearing case 52 ... Lower bearing case 53 ... Upper Bearing 54 ... Oil seal 55 ... Upper gear case 56 ... Lower gear case 57 ... Gear mechanism 58 ... Drive shaft 59 ... Lower bearing 60 ... Clutch wheel 61 ... Clutch spring 62 ... Claw wheel 63 ... Claw part 64 ... Clutch lever 65 ... Clutch Shaft 66 ... Coil spring 67 ... Brake band 68 ... Brake lever 70 ... Inverter circuit 71 ... AC / DC conversion circuit 72 ... Switching circuit 73 ... Drive unit 74 ... Motor control unit 75 ... Rotation detector

Claims (1)

Rotation drive including a laundry dewatering tub rotatably provided in the outer tub, a stirring body rotatably provided in the laundry dewatering tub, and a motor for rotationally driving the laundry dewatering tub and the stirring body And a drive control means for controlling the rotation of the motor, and the tank rotating operation for rotating the washing and dewatering tank and the agitator in one direction at a high speed and the agitator only in both the left and right directions. In the washing machine that executes a drying process of drying the laundry in the laundry dewatering tub by repeating the stirring rotation operation that rotates in the reverse direction in the rotation direction,
Each time the rotation direction of the stirring body is reversed during the stirring rotation operation, an index value that reflects the load applied to the motor being rotated is acquired, and the reversing operation is performed until the index value reaches a predetermined value or falls within a predetermined range. A washing machine comprising: operation control means for controlling the drive control means so as to repeat the above.