CN100424251C - Dewatering operation method for full-automatic washing machine - Google Patents
Dewatering operation method for full-automatic washing machine Download PDFInfo
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- CN100424251C CN100424251C CNB2003101175630A CN200310117563A CN100424251C CN 100424251 C CN100424251 C CN 100424251C CN B2003101175630 A CNB2003101175630 A CN B2003101175630A CN 200310117563 A CN200310117563 A CN 200310117563A CN 100424251 C CN100424251 C CN 100424251C
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- dewatering
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- 238000005406 washing Methods 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000007246 mechanism Effects 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims abstract description 3
- 230000018044 dehydration Effects 0.000 claims description 89
- 238000006297 dehydration reaction Methods 0.000 claims description 89
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 230000033001 locomotion Effects 0.000 claims description 16
- 230000009471 action Effects 0.000 claims description 5
- 208000005156 Dehydration Diseases 0.000 description 69
- 230000002457 bidirectional effect Effects 0.000 description 18
- 238000013461 design Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 238000003756 stirring Methods 0.000 description 4
- 238000003809 water extraction Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000002463 transducing effect Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The present invention relates to a dewatering operation method for a full-automatic washing machine. A dewatering operation sysetm is hung in an outer housing of the washing machine which comprises a water containing barrel, a hanging mechanism, a washing and dewatering tank, a motor and a transmission mechanism, wherein the washing and dewatering tank is arranged in the water containing barrel, and the motor is used for driving the washing and dewatering tank to rotate. The dewatering operation system has a first resonance point in a low frequency. The washing machine also has a device and a program controlling device, wherein the device is used for detecting rotary imbalance of the washing and dewatering tank, and the program controlling device is used for receiving sensing signals of the device, etc. for controlling the operation of the motor, etc. When a dewatering operation program is started, the washing and dewatering tank rotates at a speed of the first resonance point which is adjacent to the dewatering operation system in a set time; if the moving frequency of an imbalance detecting device is larger than the specified value, the program controlling device starts to automatically correct an imbalance program, and the dewatering operation program is restarted, or else the washing and dewatering tank accelerates to a set high speed to operate. The method can better detect and correct the imbalance of the washing and dewatering tank and improve the vibration and the noise of the dewatering operation. The structure of the washing machine is simple.
Description
Technical field
The present invention relates to dehydration method of operation as the electric washer or the Water Extraction Machinery of centrifugal dewater unit, refer in particular to the dehydration method of operation of a kind of family expenses impeller-type or stirring type fully-automatic washing machine, classification belongs to D06F49/00 or D06F33/02 in the International Patent Classification (IPC).
Background technology
General family expenses impeller-type or stirring type fully-automatic washing machine are as shown in Figure 1, in the outer case 1 on being arranged at base by suspension rod 2 steel ladle 3 that can be hung with freely swinging, in steel ladle 3, can be provided with the dehydration washing trough 5 that the bottom is taken back changes agitator 4 freely to rotate, single-phase capacitor operation motor 6 and clutch reduction gearing mechanism 7 as driving mechanism are installed in the bottom of steel ladle 3, the top of outer case 1 and steel ladle 3 is equipped with top cover 9, but the cover 10 of freely openable is housed on the top cover 9, and reception transducing signal and the cyclelog 12 that electrical equipment such as motor 6 are controlled are installed within the washing machine cover lid 9.This automatic washing machine dewaters by the centrifugal force that dehydration washing trough drives clothing rotation generation, and its rotating speed is generally about 900 rev/mins.
This automatic washing machine is when dehydration, and the washings in the dehydration washing trough can secundly.The result of this deviation of gravity center axis be the suspention steel ladle 3 system's deflections, thereby near or touch outer case 1, when dehydration washing trough rotates, can bump, cause bigger vibration noise.Prior art is for overcoming the existing many schemes of this problem.Traditional measure is that the uneven checkout gear 11 that detects steel ladle 3 deflections is set in outer case 1, presetting apparatus 12 is according to the signal of uneven checkout gear 11, make and stop to dewater motion or the control of redress disequilibrium automatically, for example reinject water and suitable rotating spoon 4 with the agitator treating thing, make its distribution be tending towards even.
Uneven checkout gear 11 is the switch of its driver part (for example lever) between outer case 1 and steel ladle 3 mostly.This switch is commonly referred to safety switch, can detect the keying state of cover 10 simultaneously.
This traditional measures is fairly simple, but uneven checkout gear 11 is difficult to accurately reflect steel ladle 3 deflections, and it detects often too sensitive, and very little reasonable deflection is also moved; Or too blunt, the deflection that should handle greatly is failure to actuate, so that influence the normal operation of washing machine.Chinese invention patent application specification CN1381638A " dehydration controlling method of washing machine " and CN1448577A " the uneven checkout gear and the detection method of washing machine " (applicant: disclosed improved measure Mitsubishi Electric Corporation), for example the action frequency of uneven checkout gear 11 has been analyzed and controlled by the controller of washing machine.Washing machine is when dehydration, and the situation of washings in dehydration washing trough changes.This analysis and Control of being carried out according to fixing pattern by the controller of washing machine seems and owes not too reliable, and control also becomes complicated.
For overcoming the vibration noise problem that steel ladle 3 systems' deflections that washings in the dehydration washing trough can secundly causes suspending in midair take place, conventional art is, at first making dehydration washing trough carry out a certain duration of runs rate (refers in the working cycles, the ratio of the duration of runs and the total time of working cycles, claim again start-stop than or make-to-break ratio) commentaries on classics---stop taking off running between what is called that---commentaries on classics---stop, before entering stable maximum speed, suitably remove the moisture of washings.It is intended that by reducing quality and alleviates deflection and the vibration that off-centre causes.Because it is 0.67～1.67 hertz the 1st resonance point and 5～10 hertz the 2nd resonance point that the general family expenses impeller-type or the dehydration movement system of stirring type fully-automatic washing machine have frequency usually, take off the rotary speed repeated multiple times of the fluctuation that can make dehydration washing trough like this and cross these two resonance points that produce peak swing, thereby bigger vibration and noise take place.Chinese patent specification CN1090261C " running controller for fully antomatic washing machine " (patentee: the speed that adopts the closed-loop control dehydration washing trough to rotate Hitachi, Ltd.), and set its speed ascending curve, make it cross the resonance point of two meetings generations fast than large amplitude, be arranged in the off-resonance zone and take off between carrying out, reach maximum speed at last.Though this method solves the problem of taking off between tradition, and the speed detection method need be set; Closed-loop control is complex structure both, also is easy to generate self-oscillation; And with take off equally because can not reliable detection and handle the off-centre of washings, this off-centre still can produce bigger vibration and noise when dehydration washing trough rotates at a high speed.
Summary of the invention
Technical problem to be solved by this invention is: a kind of automatic washing machine dehydration method of operation is provided, it is compared with prior art, can detect the uneven situation of dehydration washing trough more reliably, therefore can make uneven the processing more up hill and dale, improve the vibration and the noise of dehydration running, and structure is still fairly simple.
The technical scheme that the present invention solves its technical problem employing is: a kind of automatic washing machine dehydration method of operation, and this washing machine suspends the dehydration movement system in midair in outer case, comprising:
---the mechanism of steel ladle and the past outer case of suspention thereof,
---the dehydration washing trough that in this steel ladle, can be provided with freely to rotate,
---drive the motor and the transmission mechanism of this dehydration washing trough rotation in this steel ladle bottom;
This dehydration movement system has the 1st resonance point of lower frequency;
This washing machine also has:
---other electrical equipment except that described motor comprise: tractor draining valve, entering water electromagnetic valve, selector switch, level sensor;
---detect described dehydration washing trough and rotate unbalanced uneven checkout gear;
---presetting apparatus, it has automatic redress disequilibrium program, receives the signal of uneven checkout gear, controls the running of described motor and other electrical equipment;
It is characterized in that its dehydration running comprises the steps:
(1) this dehydration washing trough rotates a setting-up time with the rotating speed of described dehydration movement system the 1st resonance point of correspondence;
(2) in the described setting-up time of step (1), if uneven checkout gear action frequency is greater than setting, presetting apparatus starts automatic redress disequilibrium program, and after this program repeating step (1); Otherwise this dehydration washing trough accelerates to the fair speed running of setting.
So the technical program is utilized the characteristics of resonance dexterously, the design dehydration washing trough is with the speed rotation of the 1st resonance point of the described dehydration movement system of correspondence, the imbalance of dehydration washing trough can make the dehydration movement system produce maximum amplitude, thereby turn harm into good, improve uneven sensitivity and the reliability that detects greatly.With this detection is the imbalance processing of foundation, can avoid the dehydration washing trough vibration that the washings imbalance causes when high rotating speed, noise and collsion damage more reliably, and the control ratio prior art is obviously simple.
One of further design of described technical scheme is that the dehydration washing trough mean speed in the described step (1) is designed to 40～100 rev/mins.This design is applicable to that relatively the 1st resonance point frequency is 0.67～1.67 hertz washing machine and a Water Extraction Machinery, the uneven situation of reliable detection dehydration washing trough.
Two of the further design of described technical scheme is that greater than stipulated number, washing machine is out of service or/and send signal as if described repeating step (1).This design makes the washing machine operation safer.
Three of the further design of described technical scheme is that described dehydration running has following steps:
(3) this dehydration washing trough rotates a setting-up time with the short rate duration of runs;
(4) in the described setting-up time of step (3), if uneven checkout gear number of times is greater than setting, presetting apparatus starts automatic redress disequilibrium program, and after this program repeating step (3); Otherwise this dehydration washing trough is with the long rate rotation duration of runs.
This design has the benefit of taking off the method for operation between traditional, and dehydration washing trough can cover the frequency of resonance point in the scope of broad with the velocity perturbation of the rate running duration of runs, and speed control can be fairly simple.
Dehydration movement system for the 2nd resonance point that also has upper frequency, one optimal way of this method is: in step (4), if uneven checkout gear number of times is not more than setting, dehydration washing trough rotation earlier accelerates to fair speed, then with the long rate rotation duration of runs.This method of operation can make the dehydration movement system cross the 2nd resonance point fast, avoids incidental excessive vibration this moment and noise.
Designing the described short rate duration of runs is 0.25, and its repetition rate is 0.25 hertz; Long duration of runs, rate 0.5, and its repetition rate is 0.125 hertz, is applicable to that relatively the 1st resonance point frequency is 0.67～1.67 hertz washing machine and a Water Extraction Machinery, with the uneven situation of reliable detection dehydration washing trough.
Description of drawings
Following accompanying drawing is used for embodiments of the invention as directed:
Fig. 1 is the structural representation of the complete machine of embodiment of the invention automatic washing machine;
Fig. 2 is the circuit block diagram of embodiment of the invention automatic washing machine;
Fig. 3 is the dehydration running program figure of embodiment of the invention automatic washing machine;
Fig. 4 is embodiment of the invention automatic washing machine motor dehydration running "on" position figure and the state diagram of dehydration washing trough rotating speed.
The specific embodiment
The complete machine structure of embodiment of the invention automatic washing machine as shown in Figure 1.In the outer case 1 on being arranged at base by suspension rod 2 steel ladle 3 that can be hung with freely swinging, in steel ladle 3, can be provided with the dehydration washing trough 5 that the bottom is taken back changes agitator 4 freely to rotate, single-phase capacitor operation motor 6 and clutch reduction gearing mechanism 7 and tractor draining valve 13 as driving mechanism are installed in the bottom of steel ladle 3, the top of outer case 1 and steel ladle 3 is equipped with top cover 9, but the cover 10 of freely openable is housed, level sensor 14 on the top cover 9, the cyclelog 12 and the entering water electromagnetic valve 8 that receive transducing signal and electrical equipment such as motor 6 are controlled are installed within the washing machine cover lid 9.In addition, this automatic washing machine dewaters by the centrifugal force that dehydration washing trough drives clothing rotation generation, and its rotating speed is generally about 900 rev/mins.Safety switch 11 is set in the outer case 1, and its activation lever is between outer case 1 and steel ladle 3.When being inclined to a certain degree, steel ladle 3 can make the contacting of safety switch 11.By with the structure of activation lever interlock, safety switch 11 is monitored the keying state of cover 10 simultaneously.
Fig. 2 is the circuit block diagram of washing machine shown in Figure 1, cyclelog 12 comprises the drive circuit 16 that 4 road bidirectional thyristors of a single-chip microcomputer 15 (model is P87LPC762) and 4 I/O mouth triggering controls thereof are formed, the output of the 1 road bidirectional thyristor connects the 1st phase of motor 6, the output of the 2 road bidirectional thyristor connects the 2nd phase of motor 6, the output of the 3 road bidirectional thyristor connects entering water electromagnetic valve 8, the output of the 4 road bidirectional thyristor connects tractor draining valve 13, washing, mode such as rinsing and dehydration selector switch 17, level sensor 14 are connected 3 I/O mouths of single-chip microcomputer 15 with the output of safety switch 11 grades.The dehydration procedure that solidifies in the single-chip microcomputer 15 is following steps:
(1) begin to taking off program:
---the I/O mouth that connects the 1 road bidirectional thyristor trigger electrode is 0 level,
---the I/O mouth that connects the 2 road bidirectional thyristor trigger electrode makes motor 6 drive dehydration washing trough 5 unidirectional rotations at intermittence for repeating 1 level of 4 cycle 8s width 4s;
For continuing 1 level of 5min, make motor 6 drive dehydration washing troughs 5 unidirectional continuous rotations then, finish to dehydration procedure.
(2) in step (1), receive 2 times 1 level signals, enter automatic redress disequilibrium program if connect the I/O mouth of safety switch 11
---the I/O mouth that connects the 1 road and the 2 road bidirectional thyristor trigger electrode is 0 level, and motor 6 is stopped,
---the I/O mouth that connects the 3 road bidirectional thyristor trigger electrode is 1 level, and entering water electromagnetic valve 8 action water fillings revert to 0 level when water completely makes the I/O mouth that connects level sensor 14 be 1 level, and entering water electromagnetic valve 8 moves and stops water filling,
---the I/O mouth that connects the 1 road and the 2 road bidirectional thyristor trigger electrode alternately is 1 level of washing procedure and 0 level, makes motor 6 reversible driving agitators 4 with the agitator treating thing, and its distribution is tending towards evenly,
---behind the lasting 1min, the I/O mouth that connects the 4 road bidirectional thyristor trigger electrode is 1 level, drives 13 drainings of tractor draining valve, finishes until draining, and the I/O mouth of connection level sensor 14 reverts to 0 level when being 1 level, returns step (1).
(3) if entering step (2) from step (1) reaches 3 times, the I/O mouth that connects each road bidirectional thyristor trigger electrode is 0 level, and all electrical equipment are out of service, and main program interrupts.
More than describing is typical case's formation of a kind of family expenses full-automatic pulsator washing machine of prior art, can certainly be the electric centrifugal-type dewater unit or the Water Extraction Machinery of stirring type fully-automatic washing machine or similar structures.The embodiment of the invention is to improve on the basis of such washing machine to form, and mainly is that the step (1) in the described dehydration procedure is changed to:
(1) begin to taking off program:
---the I/O mouth that connects the 1 road bidirectional thyristor trigger electrode is 0 level,
---connect the I/O mouth of the 2 road bidirectional thyristor trigger electrode, in Fig. 4 duration t1, repeat 1 level of 7 cycle 4s width 1s, make motor 6 drive dehydration washing trough 5, carry out imbalance and detect with mean speed n1=60 rev/min of (40 rev/mins of positive negative variations) unidirectional rotation at intermittence;
---the I/O mouth that connects the 2 road bidirectional thyristor trigger electrode is 1 level by Fig. 4 duration t2=10s, makes motor 6 drive dehydration washing trough 5 unidirectional continuous rotations, accelerates to about 600 rev/mins of specified dehydrating speeds;
---connect the I/O mouth of the 2 road bidirectional thyristor trigger electrode, in Fig. 4 duration t3, repeat 1 level of 3 cycle 8s width 4s, make motor 6 drive dehydration washing trough 5, take off running between carrying out with mean speed n3=600 rev/min of (100 rev/mins of positive negative variations) unidirectional rotation at intermittence;
---the I/O mouth that connects the 2 road bidirectional thyristor trigger electrode makes motor 6 drive dehydration washing trough 5 with the about 850 rev/mins of unidirectional continuous rotary dehydrations of specified dehydrating speed, to EP (end of program) for continuing 1 level of 5min.
See Fig. 3 by the dehydration running program flow process that step after the above change (1) follow-up former (2) in steps and step (3) are formed.
Embodiment of the invention washing machine rated capacity is 5kg.After tested, the dehydration movement system of this washing machine has frequency and is about the 1st resonance point of 1 hertz (corresponding dehydrating speed n1=60 rev/min) and the 2nd resonance point of 7 hertz (corresponding dehydrating speed n2=420 rev/mins).Experimental result shows that above routine data is applicable to this washing machine.The "on" position of motor and the rotating speed state of dehydration washing trough are seen Fig. 4 during its dehydration running.
For the different washing machine of rated capacity, frequency of its dehydration movement system resonance point will change to some extent, but capacity is in 3～6kg scope, and the present embodiment routine data is also applicable.If adjust a little by experiment, effect can be better.For example, the mean speed of design can reduce about 10 rev/mins for the washing machine of larger capacity; For for washing machine, can improve about 20 rev/mins than low capacity.
Drive the system of single-phase capacitor operation motor in the present embodiment by bidirectional thyristor, also can change the system that drives variable-speed motor by variable-frequency power sources into, and adjust in aforementioned n1 speed, make the dehydration movement system run on the stabilized (steady-state) speed that is equivalent to the 1st resonance point more exactly and carry out the imbalance detection.
Test shows that embodiment of the invention washing machine can detect the uneven situation of dehydration washing trough more reliably with respect to prior art, therefore makes uneven the processing more up hill and dale, improves the vibration and the noise of dehydration running,
Claims (6)
1. automatic washing machine dehydration method of operation, this washing machine suspend the movement system that dewaters in outer case, comprising:
---the mechanism of steel ladle and the past outer case of suspention thereof,
---the dehydration washing trough that in this steel ladle, can be provided with freely to rotate,
---drive the motor and the transmission mechanism of this dehydration washing trough rotation in this steel ladle bottom;
This dehydration movement system has the 1st resonance point of lower frequency;
This washing machine also has:
---other electrical equipment except that described motor comprise: tractor draining valve, entering water electromagnetic valve, selector switch, level sensor;
---detect described dehydration washing trough and rotate unbalanced uneven checkout gear;
---presetting apparatus, it has automatic redress disequilibrium program, receives the signal of uneven checkout gear, controls the running of described motor and other electrical equipment;
It is characterized in that its dehydration running comprises the steps:
(1) this dehydration washing trough rotates a setting-up time with the rotating speed of described dehydration movement system the 1st resonance point of correspondence;
(2) in the described setting-up time of step (1), if uneven checkout gear action frequency is greater than setting, presetting apparatus starts automatic redress disequilibrium program, and after this program repeating step (1); Otherwise this dehydration washing trough accelerates to the fair speed running of setting.
2. according to the described automatic washing machine dehydration of claim 1 method of operation, it is characterized in that the dehydration washing trough mean speed in the described step (1) is 40～100 rev/mins.
3. according to the described automatic washing machine dehydration of claim 1 method of operation, it is characterized in that greater than stipulated number, washing machine is out of service or/and send signal as if described repeating step (1).
4. according to the described automatic washing machine dehydration of claim 1 method of operation, it is characterized in that described dehydration running has following steps:
(3) this dehydration washing trough rotates a setting-up time with the short rate duration of runs;
(4) in the described setting-up time of step (3), greater than setting, presetting apparatus starts automatic redress disequilibrium program, repeating step after this program (3) as if uneven checkout gear action frequency; Otherwise this dehydration washing trough is with the long rate rotation duration of runs.
5. according to the described automatic washing machine dehydration of claim 4 method of operation, it is characterized in that described dehydration movement system also has the 2nd resonance point of upper frequency; In described step (4), if uneven checkout gear number of times is not more than setting, dehydration washing trough rotates continuously earlier and accelerates to fair speed, then with the described long rate rotation duration of runs.
6. according to claim 4 or the described automatic washing machine dehydration of claim 5 method of operation, it is characterized in that the described short rate duration of runs is 0.25, its repetition rate is 0.25 hertz; Long duration of runs, rate 0.5, and its repetition rate is 0.125 hertz.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2003101175630A CN100424251C (en) | 2003-12-29 | 2003-12-29 | Dewatering operation method for full-automatic washing machine |
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| CNB2003101175630A CN100424251C (en) | 2003-12-29 | 2003-12-29 | Dewatering operation method for full-automatic washing machine |
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| CN1635208A CN1635208A (en) | 2005-07-06 |
| CN100424251C true CN100424251C (en) | 2008-10-08 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006032337A1 (en) * | 2006-07-12 | 2008-01-17 | BSH Bosch und Siemens Hausgeräte GmbH | Method for controlling a spin cycle of a washing machine and suitable for performing the method suitable washing machine |
| CN104032538B (en) * | 2013-03-06 | 2016-12-28 | 海尔集团公司 | Washing machine dehydration control method and washing machine |
| WO2015192403A1 (en) * | 2014-06-16 | 2015-12-23 | 青岛海尔洗衣机有限公司 | Method for detecting imbalance of washing machine, and washing machine |
| CN104178974A (en) * | 2014-08-13 | 2014-12-03 | 合肥荣事达三洋电器股份有限公司 | Tumbling-box washing machine with noise sensor and noise monitoring method thereof |
| CN105937126B (en) * | 2016-06-28 | 2019-04-16 | 无锡小天鹅股份有限公司 | Washing machine and its control method and device |
| CN110409116B (en) * | 2018-04-28 | 2023-05-23 | 青岛海尔洗衣机有限公司 | Control method of washing machine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3229845B2 (en) * | 1996-12-18 | 2001-11-19 | 三洋電機株式会社 | Centrifugal dehydrator |
| JP3311668B2 (en) * | 1998-03-06 | 2002-08-05 | 三洋電機株式会社 | Drum type centrifugal dehydrator |
| CN1381638A (en) * | 2001-03-27 | 2002-11-27 | 三菱电机株式会社 | Dewater control method of washing machine |
| JP2003093777A (en) * | 2001-09-26 | 2003-04-02 | Sanyo Electric Co Ltd | Drum type washing machine |
| CN1448577A (en) * | 2002-03-28 | 2003-10-15 | 三菱电机株式会社 | Apparatus and method for detecting imbalance in washing machines |
-
2003
- 2003-12-29 CN CNB2003101175630A patent/CN100424251C/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3229845B2 (en) * | 1996-12-18 | 2001-11-19 | 三洋電機株式会社 | Centrifugal dehydrator |
| JP3311668B2 (en) * | 1998-03-06 | 2002-08-05 | 三洋電機株式会社 | Drum type centrifugal dehydrator |
| CN1381638A (en) * | 2001-03-27 | 2002-11-27 | 三菱电机株式会社 | Dewater control method of washing machine |
| JP2003093777A (en) * | 2001-09-26 | 2003-04-02 | Sanyo Electric Co Ltd | Drum type washing machine |
| CN1448577A (en) * | 2002-03-28 | 2003-10-15 | 三菱电机株式会社 | Apparatus and method for detecting imbalance in washing machines |
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