JP4380468B2 - Drum washing machine - Google Patents

Description

  The present invention relates to a drum-type washing machine in which laundry is put into a rotating drum, and washing is performed by sequentially controlling each process such as washing, rinsing and dehydration.

  A conventional drum type washing machine of this type will be described with reference to FIGS. FIG. 9 is a longitudinal sectional view of a conventional drum type washing machine, and FIG. 10 is a diagram showing a transition of the dehydration rotation speed in the dehydration process of the drum type washing machine.

  As shown in FIG. 9, the rotary drum 1 is provided with a large number of water passage holes 2 on the entire outer peripheral portion, and is rotatably disposed in the water receiving tank 3. One end of the horizontal shaft 4 is fixed to the rotation center of the rotary drum 1, and a drum pulley 5 is fixed to the other end of the horizontal shaft 4. The motor 6 is connected to the drum pulley 5 by a belt 7 and rotationally drives the rotary drum 1. A lid 8 is provided at the opening of the rotary drum 1 so as to be freely opened and closed. The water receiving tub 3 is suspended from the washing machine main body 9 by a spring body 10, and is supported by anti-vibration so that vibration during dehydration is not transmitted to the washing machine main body 9 by the anti-vibration damper 11, and also reduces vibration during dehydration. A weight 12 is provided. The heater 13 heats the washing water in the water receiving tub 3. The control device 14 controls operations of the motor 6, the heater 13, and the like, and sequentially controls a series of processes such as washing, rinsing, and dehydration (see, for example, Patent Document 1).

  The operation of the drum type washing machine configured as described above will be described below with reference to FIG.

  When the lid 8 is opened and the laundry is put into the rotating drum 1 and the operation is started, the rotating drum 1 is rotated at a low speed by the motor 6 in the washing process, and the laundry in the rotating drum 1 is lifted up to the water surface. Fall down. Thus, the washing process proceeds. In the rinsing process, the same operation as in the washing process is performed. In the dehydration process, the rotary drum 1 is rotationally driven at a high speed, and the laundry is centrifugally dehydrated.

The dehydration process includes a cloth balance determination process in which the rotating drum 1 is rotated at a predetermined rotation speed V01 (for example, 90 r / min) to determine the degree of deviation of the laundry, and the longitudinal resonance rotation speed V02 of the rotating drum 1 (for example, 300 r / min). min) through the abnormal vibration determination process for determining abnormal vibration, and the rotational speed V03 to V04 of the rotating drum 1 is between 500 and 800 r / min, the dewatering bubble activation failure that inhibits the rotation of the rotating drum 1 by bubbles is performed. If the dehydration bubble activation determination process is performed and the dehydration bubble activation is not defective, the maximum rotation speed V05 (for example, 900 r / min) is reached.
Japanese Patent Laid-Open No. 10-201988

  However, in such a conventional drum type washing machine, the foam and water contained in the laundry remain at the bottom of the water receiving tub during the dehydration process depending on the excessive amount of detergent and the drainage conditions such as the drainage path. However, the rotation of the rotating drum is hindered, causing dehydration foam activation failure, and in this state, the foam increases more and more, so that the foam enters the drying path or the like, and the foam enters the water receiving tank. There was a problem that it would overflow and cause failure.

  Therefore, as a countermeasure, the defoaming bubble activation failure state was detected at 500 to 800 r / min, for example, by a method of detecting a change in the input current value of the motor or the rotation speed, and the defoaming operation was performed. When the amount is large and the dehydrated foam activation state is terrible, there is a problem that a large amount of foam has already been generated and bubble overflow has occurred at the time of detection.

In addition, in order to prevent abnormal vibration at the longitudinal resonance resonance speed (for example, 300 r / min) of the rotating drum, abnormal vibration is detected by detecting changes in the input current value of the motor and the rotational speed at that rotational speed. In the case where the abnormal vibration detection means is provided, if the dewatering bubble activation failure state occurs at the above-mentioned pitching resonance rotational speed, it is erroneously detected as abnormal vibration, and the clothing is corrected so that the foam is corrected. There was a problem that the phenomenon of not easily disappearing occurred.

The present invention solves the above-mentioned conventional problems. When a dewatering foam start-up failure occurs due to residual foam water caused by excessive input of detergent or drainage conditions, it prevents failure due to foam overflow and An object of the present invention is to provide a drum-type washing machine that can effectively recover from a water bubble activation failure state.

In order to solve the above-described conventional problems, a drum type washing machine of the present invention includes a rotating drum having a rotation center axis in a substantially horizontal direction or an inclined direction, and elastically supported by the washing machine body so as to include the rotating drum. A water receiving tank, a water supply means for supplying water into the water receiving tank, a draining means for draining the water in the water receiving tank, a motor for driving the rotating drum, the motor, the water supplying means, the draining means, etc. Control means for controlling the operation and detecting excessive generation of bubbles in the dehydration process, and when the control means detects the excessive generation of bubbles, the control unit drains the draining means once in an open state, and then The drainage means was closed, and the rotating drum was repeatedly rotated and stopped in this closed state, and one cycle of rotation and stop was performed with a defoaming operation that executed the stop time longer than the rotation time. rear In which the the drainage means and opened again, due to residual bubbles water caused by or throw excessive and drainage conditions of the detergent, when de-blistering start-up failure occurs, thereby preventing a malfunction due to overflow froth, leaving blisters It is possible to effectively recover the startup failure state.

Drum-type washing machine of the present invention, due to residual bubbles water caused by or throw excessive and drainage conditions of the detergent, when de-blistering start-up failure occurs, thereby preventing a malfunction due to overflow foam, de-blistering start fault condition Can be effectively recovered.

1st invention WHEREIN: The rotating drum which has a rotation center axis | shaft in a substantially horizontal direction or the inclination direction, the water receiving tank which is elastically supported by the washing machine main body and encloses the rotating drum, and supplies water in the water receiving tank Control of the operation of the water supply means, the drainage means for draining the water in the water receiving tank, the motor for driving the rotating drum, the motor, the water supply means, the drainage means and the like, and excessive generation of bubbles in the dehydration process And a control means for detecting, when the excessive generation of bubbles is detected, the control means once drains the drainage means in an open state, and then closes the drainage means, and the rotation is performed in the closed state. Since the drum is rotated and stopped repeatedly, and one cycle of the rotation and stop is performed after the defoaming operation for executing the stop time longer than the rotation time, the drainage means is again opened . detergent When that by the residual bubble water caused by or throw excessive and wastewater conditions de blisters activation failure has occurred, it is possible to prevent the malfunction due to overflow bubbles, it can flush out efficiently with draining foam, starting de blisters The defective state can be effectively recovered.

Also, if the drain valve is not closed in the defoaming section where the defoaming operation is performed, only water is drained little by little, and high-density and highly viscous foam lump remains in the drainage path, hindering the subsequent drainage condition To do. In other words, by closing the drain valve, moderate moisture remains in the lower part of the water receiving tank, and in the foam discharge section, the drain valve is operated again to open the drain path along with the residual moisture. The collected bubbles can be washed out effectively.

In the second aspect of the invention, in particular, the control means of the first aspect of the invention detects the excessive generation of bubbles by the change in the input current value to the motor when the rotational speed of the rotary drum is made substantially constant at a predetermined rotational speed. As a result, a hardware configuration for detecting bubbles is unnecessary, and bubbles can be detected at low cost.

  In the third invention, in particular, the control means of the first invention detects the excessive generation of bubbles by changing the rotational speed of the rotary drum when the input current value to the motor is set so as to be a predetermined rotational speed. As a result, a hardware configuration for detecting bubbles is unnecessary, and bubbles can be detected at low cost.

In the fourth aspect of the invention, in particular, the control means of any one of the first to third aspects of the invention is such that, at the end of the defoaming operation, the drainage means is opened and the water supply means is opened. Since it was made to do so, since the foam | bubble can be poured out with a waste_water | drain more efficiently the residue of foam water which arises by excessive injection | throwing-in of a detergent, drainage conditions, etc., a dehydration foam starting defective state can be recovered | restored effectively.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a cross-sectional view showing a configuration example of a drum type washing machine according to the first embodiment of the present invention, and FIG. 2 is a circuit diagram of the drum type washing machine. In addition, about the same part as a prior art example, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In FIG. 1, a rotation shaft (rotation center shaft) 15 is provided in the inclination direction at the rotation center of the rotary drum 1, and the axial center direction of the rotation drum 1 is inclined downward from the front side toward the back side. A motor 16 attached to the rear surface of the water receiving tank 3 is connected to the rotating shaft 15, and the rotating drum 1 is driven to rotate in the forward and reverse directions by the motor 16. A plurality of protruding plates 17 are provided on the inner wall surface of the rotating drum 1.

  An opening 3a provided on the upward inclined surface on the front side of the water receiving tub 3 is covered with a lid 8 so that it can be opened and closed. By opening the lid 8, laundry can be put into the rotary drum 1 through the clothing doorway 18. The laundry can be taken out from the rotary drum 1. Since the lid body 8 is provided on the inclined surface facing upward, the user can reduce the degree of bending the waist when putting in and out the laundry.

  One end of the drainage channel 19 is connected to the lower part of the water receiving tub 3, and the other end of the drainage channel 19 is connected to a drain valve (drainage means) 20 to drain the washing water in the water receiving tub 3. . The water supply valve (water supply means) 21 is provided for supplying water into the water receiving tank 3 through the water supply path 22, and the water level detecting means 23 is provided for detecting the water level in the water receiving tank 3. .

  In the present embodiment, the axial center direction of the rotating drum 1 is inclined downward from the front side toward the rear side. However, the rotating shaft 15 is provided in the horizontal direction, and the axial center direction of the rotating drum 1 is horizontal. You may make it a direction.

  A heater 25 (not shown) that heats the air and a blower fan 24 (not shown) that blows the air heated by the heater 25 are provided at the rear of the water receiving tub 3 to dry the laundry in the rotary drum 1. It has a function.

  In FIG. 2, the control device 26 controls the operation of the motor 16, the drain valve (DV) 20, the water supply valve (FV) 21, the blower fan (F) 24, the heater (H) 25, etc., washing, rinsing, dehydrating And a control means 27 comprising a microcomputer for sequentially controlling a series of drying steps.

  The control unit 27 receives information from the input setting unit 28 for setting the driving course and the like, displays the information on the display unit 29 based on the information, informs the user, and starts the operation by the input setting unit 28. When set, the data from the water level detecting means 23 for detecting the water level in the water receiving tank 3 is input and the drain valve 20, the water supply valve 21, the blower fan 24, the heater 25, etc. are input via the load driving means 30. Controls the operation of washing and drying.

  At this time, the rotation control means 42 included in the control means 27 is driven based on information from a position detection means 31 (31a, 31b, 31c) described later that detects the position of the rotor (not shown) of the motor 16. By controlling the inverter 33 via the circuit 32, the rotation control (rotation speed and rotation angle control) of the motor 16 is performed. The motor 16 is a direct current brushless motor, which is not shown, and is composed of a stator having a three-phase winding and a rotor having a two-pole permanent magnet disposed on the ring. The stator has a three-phase winding. The first winding 16a, the second winding 16b, and the third winding 16c to be configured are wound around an iron core provided with a slot.

  The inverter 33 is composed of a switching element including a parallel circuit of a power transistor (for example, an insulated gate bipolar transistor (IGBT)) and a reverse conducting diode. The switching elements include a series circuit of a first switching element 33a and a second switching element 33b, a series circuit of a third switching element 33c and a fourth switching element 33d, a fifth switching element 33e and a sixth switching element. The switching element 33f is composed of a series circuit, and the series circuit of each switching element is connected in parallel.

  Here, both ends of the series circuit of switching elements are input terminals, which are connected to a DC power supply device 38a described later, and output terminals are respectively connected to connection points of two switching elements constituting each series circuit of switching elements. Yes. The output terminal is connected to the U terminal, V terminal, and W terminal of the three-phase winding, and the U terminal, V terminal, and W terminal are combined by the on / off combination of two switching elements constituting each series circuit of the switching elements. Are in three states: positive voltage, zero voltage, and release.

  The on / off of the switching element is controlled by the control means 27 based on information from the three position detection means 31a, 31b, 31c comprising Hall ICs. The position detection means 31a, 31b, 31c are arranged on the stator so as to face the permanent magnets of the rotor of the motor 16 at an electrical angle of 120 degrees.

  During one rotation of the rotor, the three position detecting means 31a, 31b, 31c each output a pulse at an electrical angle of 120 degrees. The rotation control means 42 detects when the signal state of any of the three position detection means 31a, 31b, 31c has changed, and based on the signals of the position detection means 31a, 31b, 31c, By changing the on / off states of the switching elements 33a to 33f, the U terminal, the V terminal, and the W terminal are set to three states of positive voltage, zero voltage, and release, and the first winding 16a of the stator, The winding 16b and the third winding 16c are energized to create a magnetic field and rotate the rotor.

  The first, third, and fifth switching elements 33a, 33c, and 33e are each controlled by pulse width modulation (PWM). For example, the rotation of the rotor is controlled by controlling the high and low energization ratios at a repetition frequency of 10 kHz. The speed is controlled, and the rotation control means 42 detects the period each time the signal state of any of the three position detection means 31a, 31b, 31c changes, and calculates the rotation speed of the rotor from the period. Then, the first, third, and fifth switching elements 33a, 33c, and 33e are subjected to PWM control so that the set rotation speed is achieved.

FIG. 3 is a block diagram showing the internal configuration of the rotation control means 42. In FIG. 3, the rotation control means 42 receives a signal from the position detection means 31 and detects a rotation speed detection means 42a for detecting the rotation speed of the motor 16, a rotation speed setting means 42b for setting the rotation speed of the motor 16, A rotation speed comparison means 42c for comparing the rotation speed set by the rotation speed setting means 42b with the rotation speed detected by the rotation speed detection means 42a, and a rotation speed change amount detection means 42d for detecting the change amount of the rotation speed. In order to make the rotation speed of the motor 16 close to the set rotation speed based on the comparison result from the rotation speed comparison means 42c and the change amount of the rotation speed from the rotation speed change amount detection means 42d, the first, third, and second The operation amount determination means 42e for determining the operation amount of the PWM duty of the five switching elements 33a, 33c, 33e and the operation amount determination means 42e. The PWM duty of the first, third, and fifth switching elements 33a, 33c, and 33e after being set, and the energization ratio setting means 42f that outputs to the drive circuit 32 and the elapsed time from the start of the motor 16 And an energization ratio storage means 42g that stores the PWM duty of the first, third, and fifth switching elements 33a, 33c, and 33e gradually increased and outputs the PWM duty to the drive circuit 32.

  The rotation control means 42 is energized until the number of times the signal state of any of the three position detection means 31a, 31b, 31c changes when the motor 16 is started up to three times, that is, until the motor 16 rotates 1/2. By driving the drive circuit 32 with the output signal of the ratio storage means 42g and thereafter with the output signal of the energization ratio setting means 42f, the PWM duty of the first, third, and fifth switching elements 33a, 33c and 33e is controlled. Like to do.

  In the present embodiment, the rotational speed detection means 42a is configured to detect the rotational speed of the motor 16 based on the signal from the position detection means 31, but is configured to detect the rotational speed of the rotary drum 1. Also good.

  Returning to FIG. 2, the current detection unit 34 includes a resistor 35 connected to one input terminal of the inverter 33 and a current detection circuit 36 connected to the resistor 35, and the input current value of the inverter 33 is calculated. The output voltage is detected and supplied to the control means 34. When the motor 16 is a direct current brushless motor, the torque is substantially proportional to the input current. Therefore, the torque of the motor 16 is detected by detecting the input current value of the inverter 33 by the current detection circuit 36 connected to the resistor 35. can do.

  The cloth amount detecting means 37 for detecting the amount of laundry in the rotating drum 1 is based on a signal from the current detecting means 34 when the rotating drum 1 is started up to a predetermined rotational speed (for example, 200 rpm). It is configured to detect the amount of laundry.

  The commercial power supply 38 is connected to the inverter 33 via a DC power supply 38 a including a diode bridge 39, a choke coil 40, and a smoothing capacitor 41. However, this is only an example, and the configuration of the DC brushless motor 16 and the configuration of the inverter 33 are not limited thereto.

  Next, details of the input setting means 28 and the display means 29 will be described with reference to FIG.

  As shown in FIG. 4, the input setting means 28 includes a washing time setting switch 28a for setting the washing time, a rinsing frequency setting switch 28b for setting the rinsing frequency, a dehydration time setting switch 28c for setting the dehydration time, and a drying time. A drying time setting switch 28d, a start / pause switch 28e, a power-on switch 28f, and a power-off switch 28g. The input setting means 28 is provided with a first course setting switch 28h and a second course setting switch 28i.

The first course setting switch 28h is used to set the course to be operated. A course for performing a series of steps of washing, rinsing, dehydrating and drying, a course for performing the steps of washing, rinsing and dehydration, and a drying step only. The course to be performed can be switched and set in the above order each time it is turned on.

  The second course setting switch 28i switches between an automatic course, a rush course, a private course, a blanket course, a dry course, and the like, and is switched in the above order each time it is turned on.

  The display means 29 is a course setting display section 29e for displaying the course set by the washing time display section 29a, the rinse count display section 29b, the dehydration time display section 29c, the drying time display section 29d, and the second course setting switch 28i. Etc. The display unit 29 includes a number display unit 29h. The display on the number display unit 29h is a detergent amount display unit 29f indicating the amount of detergent, and a remaining time display unit indicating the remaining time. 29g. Furthermore, the display means 29 has a soft keep display section 29i indicating that soft keeping is performed after the drying operation.

  The operation of the drum type washing machine configured as described above will be described below.

  First, the lid 8 is opened, the laundry is put into the drum 1, the power switch 28f is turned on, and then the start / pause switch 28e of the input setting means 28 is operated to start the operation. When the water level is detected and the water level detecting means 23 detects a predetermined water level, the water supply is stopped and the motor 16 is driven. In the washing process, since water is contained in the laundry, the rotating drum 1 is driven to rotate by the motor 16 while supplying water, and the laundry in the rotating drum 1 is lifted and dropped onto the water surface. When the washing process ends, the drain valve 20 operates to drain the washing water in the water receiving tub 3. Thereafter, in the dehydration process through the rinsing process, the rotary drum 1 is driven to rotate at a high speed by the motor 16, and the laundry is dewatered by centrifugation.

  Here, the operation of dehydrating from the washing process or the rinsing process will be described with reference to FIGS. FIG. 5 is a diagram showing the transition of the dehydration rotation speed during dehydration, and FIG. 6 is a flowchart during dehydration.

  When the dehydration process starts in step 100, the water is drained to the predetermined water level (reset water level) in step 102 in step 101. Next, in step 103, the rotary drum 1 is rotated forward and reverse to loosen the laundry, and in step 104, a cloth balance determination process (for example, rotating the rotary drum at the first predetermined rotation speed V1) (for example, The balance state of the laundry is determined at (V1: 90 r / min). If it is determined that the balance state is bad, the rotary drum 1 is stopped in step 106 after step 105, 1 is added to N in step 107, and the process returns to step 103. When the operations of Steps 103 to 107 are repeated a predetermined number of times, that is, when N = 4 in Step 105, the process proceeds to Step 108, where water is supplied again to perform the misalignment correction operation of the laundry. Proceed to

  On the other hand, if it is determined in step 104 that the balance state is good, in step 109, the rotational speed of the rotary drum 1 is raised to a second predetermined rotational speed V2 (for example, V2: 200 r / min). In 110, it is determined whether or not dehydrated foam has started. Here, the second predetermined rotational speed V2 is a rotational speed lower than the pitch resonance rotational speed V3 (for example, V3: 300 r / min) of the rotating drum 1.

Here, a method of detecting a dehydration bubble activation failure will be described. That is, as the rotational speed of the rotary drum 1 increases, the foam water is discharged from the laundry. At this time, when the detergent concentration of the drainage liquid is too high or the drainage conditions are bad, the drainage liquid remaining at the bottom of the water receiving tank 3 is agitated and foamed by the rotating drum 1 to fill the water receiving tank 3. The rotation of the rotating drum 1 begins to be disturbed. This state is a dehydration bubble activation failure state. Therefore, an electric current is input to the motor 16 in order to maintain the rotation speed of the rotating drum 1 at the second predetermined rotation speed V2. At this time, if the dehydrated bubble is not in a defective starting state, there is no resistance due to bubbles, so the input current value is equal to or less than the first predetermined current value. On the other hand, if the dewatering bubble activation is in a defective state, a resistance is generated in the rotation of the rotating drum 1 due to the occurrence of bubbles, and in order to maintain the rotation speed of the rotating drum 1 at the second predetermined rotation speed V2, A large amount of current must be passed, and the input current value is equal to or greater than the first predetermined current value. Therefore, when the state where the input current value is equal to or higher than the first predetermined current value continues for a predetermined time (for example, 5 seconds) or longer, it is determined that the dehydrated foam is not activated. Do not judge.

  As described above, when it is determined in step 110 that the dehydration bubble activation failure state is not established, the rotational speed of the rotating drum 1 is further increased in step 112, and in step 113, the longitudinal resonance rotational speed V3 of the rotating drum 1 is around. Then, abnormal vibration determination is performed. The abnormal vibration is determined by a change in the input current value or the rotational speed of the motor 16 around the longitudinal resonance rotational speed V3 when the rotational speed of the rotary drum 1 is increased. That is, when the input current value of the motor 16 is equal to or greater than the second predetermined current value or the rate of increase in the rotational speed is equal to or less than the predetermined value, it is determined that the vibration is abnormal. If it is determined that the vibration is abnormal, the process returns to step 105.

  If it is determined in step 113 that there is no abnormal vibration, the rotational speed of the rotating drum 1 is further increased, and after a predetermined time of operation at the dehydration maximum rotational speed V4 (eg, V4: 900 r / min) in step 114, step 115 is performed. Then, the rotary drum 1 is stopped, the dehydration process is terminated, and the process proceeds to the next process of step 116.

  On the other hand, if it is determined in step 110 that the dehydration bubble activation is in a poor state, the defoaming operation in step 111 is performed, and then the dehydration operation is not performed, and the process proceeds to the next step in step 116.

  Here, the defoaming operation in step 111 will be described with reference to FIG.

  In FIG. 7, first, as a drainage section, the drainage valve 20 is operated and opened, and the washing water in the water receiving tub 3 is drained to the reset water level. Thereafter, as a bubble elimination section, the rotary drum 1 is stopped for a predetermined time (for example, 6 minutes) with the drain valve 20 closed. At this time, the rotating drum 1 is rotated, for example, in a cycle of 5 seconds ON-55 seconds OFF. Thereafter, as the bubble discharge section, the drain valve 20 is operated again to open, and the bubbles accumulated in the drain passage 19 at the lower part of the water receiving tank 3 are discharged together with the drainage.

  Here, if the drain valve 20 is not closed in the bubble extinguishing section, only moisture is drained little by little, and a high-density, high-viscosity lump of foam remains in the drainage path 19 and hinders the subsequent drainage state and the like. . That is, by closing the drain valve 20, moderate moisture remains in the lower part of the water receiving tank 3, and further, in the foam discharge section, the drain valve 20 is operated again to be opened. Along with moisture, the bubbles collected in the drainage channel can be effectively drained.

  For the foam discharge section, as shown in FIG. 8, the drain valve 20 is again operated and opened, and at the same time, the water supply valve 21 is operated for a predetermined time (for example, 20 seconds) to be in an open state. If water is supplied into the water receiving tank 3, the foam remaining in the drainage channel 19 can be more effectively drained.

In the first embodiment, in order to maintain the rotation speed of the rotating drum 1 at the second predetermined rotation speed V2, the state where the input current value to the motor 16 is equal to or higher than the first predetermined current value is predetermined. If it continues for more than a certain time, it is determined that the dewatering bubble is not activated, but the same effect can be obtained even if the input current value of the motor 16 is made constant and the determination is made based on the change in the rotational speed of the rotating drum 1 at this time. In this case, the determination is made by looking at the difference between the rotational speed of the rotary drum 1 and the predetermined rotational speed when the input current value of the motor 16 is constant.

  In addition, in the case of laundry that tends to contain moisture, such as thick cotton clothing, since the rotational speed of the rotary drum 1 becomes higher than the resonance resonance rotational speed V3, the dehydrated foam activation failure may occur. Between step 113 and step 114, it is still effective if used together with the conventional dehydration bubble activation failure determination means at 500 to 800 r / min.

  As described above, the drum type washing machine according to the present invention prevents failure due to foam overflow when dewatering foam activation failure occurs due to foam water remaining due to excessive input of detergent or drainage conditions. Since it becomes possible to effectively recover the dewatering bubble activation failure state without erroneously detecting the abnormal vibration of the pitching resonance rotation speed of the rotating drum, the present invention can be applied to various washing machines having a dewatering process.

Sectional drawing of the drum type washing machine in Embodiment 1 of this invention Circuit diagram of the drum type washing machine The block diagram which shows the structure of the rotation control means of the drum type washing machine The figure which shows the detail of the display means and input setting means of the drum type washing machine The figure which shows transition of dehydration rotation speed at the time of dehydration of the drum type washing machine Flow chart at the time of dehydration of the drum type washing machine Shows the anti-foaming action that put at the time of dehydration of the drum type washing machine Shows another anti-foaming action that put at the time of dehydration of the drum type washing machine Vertical section of a conventional drum-type washing machine The figure which shows transition of dehydration rotation speed in the dehydration process of the drum type washing machine

DESCRIPTION OF SYMBOLS 1 Rotating drum 3 Water receiving tank 9 Washing machine main body 16 Motor 20 Drain valve (drainage means)
21 Water supply valve (water supply means)
27 Control means

Claims (4)

A rotating drum having a rotation center axis in a substantially horizontal direction or an inclined direction; a water receiving tank elastically supported by a washing machine body and enclosing the rotating drum; water supply means for supplying water into the water receiving tank; A drainage means for draining water in the receiving tank, a motor for driving the rotating drum, and a control means for controlling the operation of the motor, the water supply means, the drainage means and the like and detecting the excessive generation of bubbles in the dehydration process. And the control means drains the drainage means once in an open state when it detects the excessive generation of bubbles, and then closes the drainage means, and the rotation drum is rotated and stopped in this closed state. repeatedly executed, and, after this the rotation as one cycle of the stop performing defoaming action to perform longer more downtime than rotation time, drum was characterized by said drainage means and opened again濯機. 2. The drum-type laundry according to claim 1, wherein the control means detects an excessive generation of foam based on a change in an input current value to the motor when the rotational speed of the rotary drum is made substantially constant. Machine. 2. The drum type laundry according to claim 1, wherein the control means detects an excessive generation of foam based on a change in rotation speed of the rotating drum when an input current value to the motor is set so as to achieve a predetermined rotation speed. Machine. The drum type washing machine according to any one of claims 1 to 3, wherein the control means opens the drainage means and opens the water supply means at the end of the defoaming operation.

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