JP4296969B2 - 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.

  As shown in the figure, the rotating drum 1 is provided with a large number of water passage holes 2 on the entire outer surface thereof, 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.

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

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 high speed, and the laundry is centrifugally dehydrated (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 10-201988

  However, such conventional drum-type washing machines have laundry conditions such as when there is a lot of laundry, when there is a lot of laundry, laundry that is likely to contain water, laundry that is difficult to contain, or poor drainage conditions such as drainage channels. Since the motor on / off time is set regardless of the drainage conditions, for example, when dehydrating laundry containing a large amount of moisture such as blankets, or dewatering rated capacity towels, towel sheets, etc. In some cases, the water receiving tub 3 rotates because a large amount of water is contained in the laundry, and when the time for draining is short, bubbles and water contained in the laundry remain in the bottom of the water tub. In some cases, poor drainage, dehydrated foam activation, and large residual water noise were generated.

Further, in order to avoid poor drainage and residual water, as shown in FIG. 11, a stop step of stopping the rotating drum 1 after once performing dehydration at a dehydration rotational speed V ₁ lower than the target dehydration rotational speed V _2. When the dehydration is performed, the balance of the clothes attached to the rotating drum will be lost due to centrifugal force, and it will take time to ensure the balance of the clothes when the dehydration is started. There was also the problem of becoming extremely long.

  The present invention solves the above-described conventional problems, and prevents foam and residual water from drainage, dewatering foam activation, and large residual water noise caused by variations in laundry conditions and drainage conditions, and balances clothing. An object of the present invention is to provide a drum type washing machine capable of performing dehydration efficiently and in a short time while ensuring a stable balance state without breaking down.

In order to solve the above-described conventional problems, the drum type washing machine of the present invention includes a rotating drum rotatably disposed in a water receiving tub, a driving means for driving the rotating drum, and a loaded laundry. Amount of
And a control means for controlling the drive means. The control means includes the rotating drum between each of the washing, rinsing and dewatering strokes and at least one of the dewatering strokes. After performing a rotation increasing process to increase the rotation speed of the garment to a lower rotation speed than the target dehydration rotation speed, the rotation speed is lowered to a level at which the clothes stuck to the rotating drum do not fall off by centrifugal force and maintained for a predetermined time, and then the target dehydration is performed. Increasing the number of rotations to the number of rotations, when the amount of laundry detected by the cloth amount detection means is greater than a predetermined amount, compared to when the amount of laundry detected by the cloth amount detection means is less than a predetermined amount, in which laundry stuck to rotary drum by centrifugal force is to set the rotation speed to low in the step of driving down to the rotational speed so as not to fall, the laundry conditions, variations in the effluent conditions Even if it performs stable dehydration, it prevents drainage failure, dehydrated foam activation, and large residual water noise due to poor dehydration activation, and lowers the rotation speed to such an extent that the clothing stuck to the drum does not fall off due to centrifugal force. Thus, dehydration can be performed efficiently and in a short time while maintaining a stable clothing balance without losing the clothing balance.

  The drum type washing machine of the present invention prevents bubbles and residual water from drainage, activated dehydrated foam, and large residual water noise caused by variations in laundry conditions and drainage conditions, and is stable without breaking the balance of clothing. Dehydration can be performed efficiently and in a short time while ensuring a balanced state of the clothes.

According to a first aspect of the present invention, there is provided a rotating drum rotatably disposed in a water receiving tub, a driving means for driving the rotating drum, a cloth amount detecting means for detecting the amount of laundry loaded, and the driving Control means for controlling the means, wherein the control means lowers the rotational speed of the rotary drum below the target dewatering speed during each of the washing, rinsing, and dewatering strokes and at least one of the dewatering strokes. After performing the rotation increasing process to increase to the rotation speed, the rotation speed is increased to the target dehydration rotation speed after decreasing to a rotation speed at which the clothes attached to the rotating drum do not fall off by centrifugal force and maintained for a predetermined time. When the amount of laundry detected by the detecting means is larger than a predetermined amount, the laundry stuck to the rotating drum by centrifugal force compared to when the amount of laundry detected by the cloth amount detecting means is smaller than the predetermined amount So as not to fall Of which was to be set lower rotation speed in the step of driving down to the rotational speed, the condition of the laundry, even with variations in the drainage conditions performed stably dehydration operation by dehydration start-up failure, drained In addition to preventing defects, dehydrated foam activation, and large residual water noise, reducing the number of rotations to such an extent that the clothing stuck to the drum by centrifugal force does not fall, so that the balance of the clothing is not lost and the stable clothing balance is maintained. Dehydration can be performed efficiently and in a short time while ensuring.

In other words, although the foam and residual water accumulated in the water receiving tank increase once when the rotation ascending process is executed, the process of draining the operation by reducing the rotation speed to such an extent that the clothes stuck to the drum by centrifugal force do not fall off is performed. As a result, the foam and residual water collected in the water receiving tub are quickly discharged, and when the amount of laundry is large, the laundry is put on the drum by centrifugal force compared to the case where the amount of laundry is small. Because it becomes easy to stick, the laundry stuck to the rotating drum can be maintained at a lower rotation speed than when the amount of laundry is small, and there are variations in laundry conditions and drainage conditions, etc. Can be stably dehydrated to prevent poor drainage, dehydrated foam activation, and large residual water noise due to poor dehydration start-up, and lower the rotation speed to such an extent that clothing stuck to the drum does not fall off due to centrifugal force. Without disturbing the balance of the kind, it is possible to perform dehydration in a short time efficiently while ensuring a stable balance condition of the garment.

A second invention is, in particular, the control means in the first invention, the target after the more rows you driving down to the rotational speed of extent that garment sticks to rotary drum is not fell Tsu multiple lines by centrifugal force The number of rotations is increased to the dehydration number of rotations, and the number of rotations during the rotation increase process is controlled to be higher than that during the previous rotation increase process, and the drainage is performed while gradually increasing the dehydration rate of the laundry. Even when the drainage conditions are considerably poor, the dehydration operation can be performed stably and the dehydration operation can be performed efficiently.

A third invention is, in particular, laundry control means of the first or second invention, when the amount of laundry detected by the laundry amount detecting means is larger than a predetermined amount, detected by the laundry amount detecting means Compared to when the amount is less than the predetermined amount, the rotation time is reduced to such a degree that the laundry stuck to the rotating drum does not fall off due to centrifugal force, and the operation time is lengthened. The optimum dehydrating operation can be performed, and when the amount of laundry is small, dehydration can be performed in a shorter time.

  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 the figure, a rotation axis (rotation center axis) 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. The rotating shaft 15 is connected to the back surface of the water receiving tank 3 and is connected to a motor 16 serving as a driving means. Several protruding plates 17 are provided on the inner wall surface of the rotating drum 1.

  The 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 as to be opened and closed. By opening the lid 8, the laundry is put into the rotary drum 1 through the clothing doorway 18, The laundry can be taken out of the rotating 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 path 19 is connected to the lower part of the water receiving tank 3, and the other end of the drainage path 19 is connected to the drain valve 20 so that the washing water in the water receiving tank 3 is drained. 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.

  In the rotating drum 1, a heater 25 that heats air and a blower fan 24 that blows air heated by the heater 25 are provided, and have a drying function of drying the laundry in the rotating drum 1. Yes.

  A 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., and is for washing, rinsing, dehydrating and drying. A control means 27 comprising a microcomputer for sequentially controlling a series of strokes is provided.

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, data from the water level detection 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 2 through the load driving means 30.
4. Control the operation of the heater 25 and the like to perform washing and drying operations.

  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, rotation control (control of the rotation speed and rotation angle) 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 rotation control means 42 detects the period whenever 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 PWM-controlled so that the set rotational speed is obtained.

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, detects a rotation speed of the motor 16, a rotation speed detection means 42 a, a rotation speed setting means 42 b that sets 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 rotation speed change amount from the rotation speed change amount detection means 42d, the first, third, and second An operation amount determination means 42e for determining the operation amount of the PWM duty of the five switching elements 33a, 33c and 33e, and the first, third and fifth switches after being operated by the operation amount determination means 42e. The duty ratio setting means 42f for setting the PWM duty of the switching elements 33a, 33c, and 33e and outputting it to the drive circuit 32, and the first, third, and fifth that gradually increase according to the elapsed time from the start of the motor 16. The switching elements 33a, 33c, and 33e are stored in the PWM duty of the switching elements 33a, 33c and 33e and output 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 a 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, reference numeral 34 denotes current detection means, which includes a resistor 35 connected to one input terminal of the inverter 33, and a current detection circuit 36 connected to the resistor 35. The value is detected and the output voltage is 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.

  37 is a cloth amount detecting means for detecting the amount of laundry in the rotating drum 1, and the rotating drum 1 is detected by a signal from the current detecting means 34 when the rotating drum 1 is raised to a predetermined rotational speed (for example, 200 rpm). It is configured to detect the amount of laundry inside.

  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 the figure, the input setting means 28 sets a washing time setting switch 28a for setting a washing time, a rinse number setting switch 28b for setting the number of times of rinsing, a dehydration time setting switch 28c for setting a dehydration time, and a drying time. It includes a drying time setting switch 28d, a start / pause switch 28e, a power-on switch 28f, a power-off switch 28g, and the like. 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. ) 21 operates to supply water, and when the water level detection means 23 detects a predetermined water level, 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 (DV) 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.

Next, the operation of performing dehydration from the washing process or the rinsing process will be described with reference to FIG. 5. In the dehydration process, the rotating drum 1 is driven to rotate by the motor 16, and the dehydrating speed is set to the target dewatering speed V ₂ (for example, 900 rpm), the rotation increasing process a43 (for example, 7 rpm / second) is performed at time t ₁ until the dehydration speed V ₁ (for example, 150 rpm) is lower, and water is gradually squeezed out from the laundry while maintaining the rotation speed until time t _2. Perform dehydration. Next, in order to drain the discharged water from the laundry, it performs the drainage operation while temporarily rotary drum 1 by decreasing the dewatering rotation number, to time t ₃ is rotationally driven.

The dewatering rotation speed V ₃ of the time is set so as to decrease to the rotational speed so as not fallen garment sticks to the drum by centrifugal force (e.g., 90 rpm). And after maintaining the dewatering rotation number, V _3, the continuous dehydration by increasing the rotational speed to the target dewatering rotation speed V ₂ performed.

As described above, in the present embodiment, after performing the rotation increasing process a43 that increases the rotation speed of the rotary drum 1 to a rotation speed lower than the target dewatering rotation speed, the clothes attached to the drum by centrifugal force do not fall off. by providing a step for draining while driving down to the rotational speed of extent, bubbles and residual water collected in the water receiving tank 3 is increased temporarily to the time t ₂ is discharged quickly. Therefore, even if there are variations in laundry conditions, drainage conditions, etc., stable dehydration operation is performed to prevent poor drainage due to poor dehydration activation, dehydrated foam activation, large residual water noise, and rotating drum 1 by centrifugal force. Since the clothes that are attached to the garment are operated at a rotation speed that does not drop, the clothes remain stably attached to the rotating drum 1 and the dehydration operation can be performed continuously without breaking the balance of the clothes. And can be dehydrated efficiently and in a short time.

(Embodiment 2)
FIG. 6 is a graph showing the transition of the dehydration rotational speed during dehydration of the drum type washing machine in the second embodiment of the present invention. The same parts as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted.

6, while the dehydration step rotates driving the rotary drum 1 by the motor 16, lower than the target dewatering rotation speed _{V 5} the dewatering rotation number (e.g., 900 rpm) dewatering rotation speed _V 4 (10
0 rpm) until running rotation upstroke b44 (e.g. 5 rpm / sec) at time _{t 5,} performs moisture squeezed gradually dehydrated from the laundry while maintaining the rotational speed until the time _{t 6.} Next, in order to drain the discharged water from the laundry, once performing a drainage operation while rotating the rotary drum 1 to time t ₇ to lower the dehydration rotation speed to dewatering rotation speed V _{6 (e.g.,} 90 rpm). At this time, as in the first embodiment, the dewatering rotation speed V ₆ is set to a low rotation speed so that the clothes stuck to the drum by centrifugal force do not fall. After maintaining the dewatering rotation number, _{V 6} to time _{t 7,} rotation increase stroke at higher than dewatering rotation speed _{V 4,} and to a lower dewatering rotation speed than the target dewatering rotation speed _{V 5 V 7} (e.g. 500 rpm) Time _{t 8} run c45 (e.g. 7 rpm / sec), and little by little squeeze dehydration of moisture from the further laundry while maintaining the rotational speed to the time t _9.

Next, in order to drain the water discharged from the laundry by rotating upstroke c45 and time t _9, the rotary drum 1 is rotated once to the time t ₁₀ to lower the dehydration rotation speed to dewatering rotation speed V ₆ While draining. After maintaining the dewatering speed V ₆ until time t ₁₀ , continuous dewatering is performed by increasing the speed at time t ₁₁ until the target dewatering speed V ₅ .

  As described above, in the present embodiment, the process of lowering the number of revolutions to a level at which the clothes attached to the rotary drum 1 does not fall off due to centrifugal force is performed a plurality of times, and the number of revolutions during the rotation-up process is further increased. By making it higher than the number of rotations during the process, drainage is performed while gradually increasing the dewatering rate of the laundry, and even when the drainage conditions become considerably poor, stable dewatering is performed, and efficient dewatering is performed. It can be carried out.

(Embodiment 3)
FIG. 7 is a graph showing the transition of the dehydration rotational speed during dehydration of the drum type washing machine in the third embodiment of the present invention. The same parts as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted.

FIG. 7A shows a change in the number of rotations of the rotary drum 1 during dehydration when the amount of laundry detected by the cloth amount detection unit 37 is small. FIG. 7B shows the amount of cloth. This shows the transition of the rotational speed of the rotating drum 1 during dehydration when there is a lot of water, and as shown in the figure, the amount of water discharged from the laundry increases as the amount of laundry increases, so the time to discharge Therefore, the dehydration time is set to t ₁₂ <t ₁₃ .

  As described above, in the present embodiment, the cloth amount detecting means 37 for detecting the amount of laundry is provided, and the rotation speed is kept low so that the clothes attached to the rotating drum 1 are not dropped by centrifugal force. By changing the draining time according to the output of the cloth amount detection means 37, it becomes possible to perform an optimal dewatering operation according to the amount of laundry, and when the amount of laundry is small, dewatering can be performed in a shorter time. can do.

(Embodiment 4)
FIG. 8 is a graph showing the transition of the dehydration rotational speed during dehydration of the drum type washing machine in the fourth embodiment of the present invention. The same parts as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted.

  FIG. 8A shows a change in the number of rotations of the rotary drum 1 during dehydration when the amount of laundry detected by the cloth amount detecting means 37 is small. FIG. 8B shows the amount of cloth. The change of the rotation speed of the rotating drum 1 at the time of spin-drying | dehydration in case there are many is shown.

When the amount of laundry detected by the cloth amount detecting means 37 is small, as shown in FIG. 8A, the rotational speed of the rotary drum 1 is decreased to a rotational speed V ₁ lower than the target dewatering rotational speed V _2. rotation upstroke d46 raising (e.g., 7 rpm / sec) is set so as to decrease until after executing the rotation speed so as not fallen clothing was stuck to the drum by centrifugal force _{V 8} (e.g., 120 rpm), the time _{t 13} It performs dehydration and drainage at a rotational speed V ₈ between, a continuous dewatering increases the rotational speed until the next target speed V _2. However, if the laundry amount sensed by the laundry amount detection 37 is large, because the clothes by centrifugal force tends to stick to the drum, as shown in FIG. 8 (b), when waste water was dehydrated at a rotational speed V ₁ of the dewatering rotation number, V _9, lower dewatering rotation speed V ₈ when the cloth amount is small rotational speed (e.g., 90 rpm) is for setting the.

  As described above, in the present embodiment, the cloth amount detection unit 37 that detects the amount of laundry is provided, and the number of rotations is such that the clothes attached to the drum by centrifugal force are not dropped. By changing according to the output, when the amount of clothing is small, it can be executed in a shorter time up to the target rotational speed, and the dehydration rate can be improved.

(Embodiment 5)
FIG. 9 is a graph showing the transition of the dehydration rotational speed during dehydration of the drum type washing machine in the fifth embodiment of the present invention. The same parts as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted.

  FIG. 9A shows a change in the number of rotations of the rotary drum 1 during dehydration when the amount of laundry detected by the cloth amount detecting means 37 is small. FIG. 9B shows the amount of cloth. The change of the rotation speed of the rotating drum 1 at the time of spin-drying | dehydration in case there are many is shown.

When the amount of cloth detected by the cloth amount detecting means 37 is small, as shown in FIG. 9A, the rotation increasing process e47 (for example, increasing the rotational speed of the rotary drum 1 to a rotational speed lower than the target dewatering rotational speed). after executing a 7 rpm / sec), the rotational speed _{V 10} to the extent that the garment does not fall that sticks to the drum by centrifugal force (e.g., set to down to 120 rpm), in the rotational speed _{V 10} for a time _{t 14} after dehydration and drainage, to perform the continuous dehydration increase the rotational speed to the target dewatering rotation speed V _2.

On the other hand, when the amount of cloth detected by the cloth amount detection 37 is large, the larger the amount of laundry, the easier the clothing will stick to the rotating drum 1 due to centrifugal force, and the moisture contained in the laundry also increases. Therefore, the amount of drainage also increases. Therefore, as shown in FIG. 9B, the dehydration speed during drainage is set to V ₁₀ > V ₁₁ (for example, 90 rpm), and the dehydration time is set to be t ₁₄ <t ₁₅ .

  As described above, in the present embodiment, the cloth amount detection means 37 for detecting the amount of laundry is provided, and the number of rotations at which the clothes stuck to the rotary drum 1 by centrifugal force are not dropped is detected. By changing according to the output of the means 37, it is possible to set the rotation speed and time according to the amount of laundry, ensure drainage performance according to the amount of laundry, and optimal dewatering in a shorter time The action can be performed.

  In the above-described embodiment, the case where a DC brushless motor is used as the motor 16 has been illustrated and described. However, the present invention is not limited to this, and for example, a DC brush motor or an induction motor is used. Even if it changes, this invention can be applied and the same effect as this invention is acquired.

  Further, the set rotational speed, the set time, and the like described in the above embodiment are merely examples, and modifications and variations thereof are also included in the present invention based on the technical idea of the scope of claims. .

  As described above, the drum-type washing machine according to the present invention prevents foam and residual water from drainage, dewatering foam activation, and large residual water noise caused by variations in laundry conditions, drainage conditions, and the like. Since the clothes attached to the drum are operated at a speed that does not cause the clothes to fall off, the clothes can be dehydrated efficiently and in a short time while maintaining a stable balance of clothes without disrupting the clothes balance. It can be applied to various washing machines having a 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 Graph showing the transition of dehydration rotation speed during dehydration of the drum type washing machine The graph which shows transition of the dehydration rotation speed at the time of dehydration of the drum type washing machine in Embodiment 2 of this invention (A) Graph showing the transition of the dewatering rotation speed at the time of dewatering of the drum type washing machine in Embodiment 3 of the present invention (when the amount of cloth is small) (b) of the dewatering rotation speed at the time of dewatering of the drum type washing machine Transition graph (when there is a lot of fabric) (A) Graph showing the transition of the dewatering speed during dewatering of the drum type washing machine in Embodiment 4 of the present invention (when the amount of cloth is small) (b) of the dewatering speed during dewatering of the drum type washing machine Transition graph (when there is a lot of fabric) (A) Graph showing the transition of the dewatering rotation speed at the time of dewatering of the drum type washing machine in Embodiment 5 of the present invention (when the amount of cloth is small) (b) of the dewatering rotation speed at the time of dewatering of the drum type washing machine Transition graph (when there is a lot of fabric) Vertical section of a conventional drum-type washing machine A graph showing the transition of the dehydration speed in the dehydration process of the drum type washing machine

1 Rotating drum 3 Water receiving tank 16 Motor (driving means)
27 Control means 43 Rotation ascending stroke

Claims (3)

Rotating drum rotatably disposed in the water receiving tub, driving means for driving the rotating drum, cloth amount detecting means for detecting the amount of laundry put in , and control means for controlling the driving means And the control means increases the rotational speed of the rotating drum to a rotational speed lower than the target dewatering speed during each of the washing, rinsing, and dewatering processes and at least one of the dewatering processes. After performing the stroke, the rotation speed is lowered to a level at which the clothes attached to the rotating drum do not fall off by centrifugal force and maintained for a predetermined time, then the rotation speed is increased to the target dewatering rotation speed, and the laundry detected by the cloth amount detection means When the amount of items is larger than the predetermined amount, the rotation is such that the laundry stuck to the rotating drum by centrifugal force does not fall compared to when the amount of laundry detected by the cloth amount detecting means is smaller than the predetermined amount. Up to number Gaité drum washing machine which is adapted to set a lower speed for the step of driving. Control means increases the rotational speed of more lines you driving down to the rotational speed so as not fallen garment sticks to rotary drum by centrifugal force to the target dewatering rotation number, then was Tsu multiple lines, during rotation upstroke The drum type washing machine according to claim 1, wherein the number of revolutions is controlled to be higher than that during the previous rotation increasing stroke. The control means is configured such that when the amount of laundry detected by the cloth amount detecting means is larger than a predetermined amount, the rotating drum is rotated by centrifugal force compared to when the amount of laundry detected by the cloth amount detecting means is smaller than the predetermined amount. The drum-type washing machine according to claim 1 or 2, wherein the operation time is reduced by lowering the number of rotations to a level at which the laundry stuck to the door does not fall .

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