JP3158452B2 - Washing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine capable of judging whether a laundry is a blanket or a non-blanket at the time of operation, and operating at a water flow intensity suitable for each laundry.

[0002]

2. Description of the Related Art Conventionally, a washing machine of this type has a big water flow,
For example, as shown in FIG. 8, a reversal time period in which right, right, left, left, right, and left rotations constitute one cycle is repeatedly performed. However, although this reversal time is a water stream suitable for washing for blankets, it is unsuitable for washing other than blankets, such as a towel blanket, and has a problem.

[0003]

In such a conventional washing machine, since the large stream is a single stream suitable for a blanket, if a towelet or the like other than the blanket is washed with the large stream, the water stream at the time of washing becomes large. Since it is too strong in the left-right rotation direction, there is a problem that washing water scatters from a washing and dewatering tub (hereinafter referred to as a washing tub) and a large amount of washing water drops on a floor or the like. In addition, there is a problem that the washing effect is weakened because the water flow is strong, so that the towelet does not spread and is rotated and washed in a lump.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and improves the washing effect even on laundry other than the blanket, while maintaining the washing effect on a blanket without impairing the washing effect of the blanket by dividing into a plurality of water streams during the operation of the large-sized water stream. The purpose is to prevent dripping of a large amount of water.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides: a stirring blade rotatably disposed in a washing and dewatering tub; a motor for inverting the stirring blade to generate a water flow; and control means for performing energization control to the motor, the load of the washing and dewatering in the water tank by the counter electromotive voltage of the motor in the rest period after energizing a predetermined time to the motor is also blankets
Has a load amount detecting means for detecting whether it is other than a blanket, and a plurality of water flows having different reversal time periods.
One is a stream for washing blankets,
And a water flow selecting means for selecting one of the flows , wherein the water flow selecting means is configured such that the load amount detecting means detects a load in the washing and dewatering tub.
Wash the blanket when it detects that the load is a blanket
The problem-solving means is to select a water flow for the purpose .

[0006]

According to the present invention, for example, it is possible to judge whether a laundry is a blanket or a non-blanket at the time of a large-sized water flow operation, to wash with a water flow suitable for the laundry, and to wash the laundry other than the blanket. And the dripping of a large amount of washing water can be prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, a washing tub 1 is rotatably disposed in an outer tub 2, and a stirring blade 3 is rotatably disposed at an inner bottom thereof. The stirring blade 3 and the washing tub 1 are connected to a speed reduction mechanism 4
And the torque of the motor 5 is transmitted. The blanket washing net 6 is used when washing a blanket. The control means 7 receives an instruction from an operation key,
By the signal from the lid switch 8, the water level detecting means 9, etc.
Bidirectional thyristors 10a and 10b for driving motor 5
And the bidirectional thyristors 10c and 10d for driving the drain valve magnet 11 and the water supply valve 12, respectively. When the bidirectional thyristor 10a is turned on, the motor 5 rotates forward, and when the bidirectional thyristor 10a is turned off and the bidirectional thyristor 10b is turned on, the motor 5 rotates reversely. The capacitor voltage detection circuit 13 detects the terminal voltage of the phase advance capacitor 14 of the motor 5, and inputs its output to the control means 7. The water flow selection means 15 selects one of a plurality of water flows stored in the control means 7 and having different inversion times. The control means 7 determines the amount of load in the washing tub 1 based on the attenuation rate of the back electromotive voltage of the motor 5 during the rest period after the motor 5 is energized for a required time based on the output of the capacitor voltage detection circuit 13.

That is, the terminal voltage of the capacitor 14 has a correlation with the rotation speed of the motor 5, and
The terminal voltage of the capacitor 14 attenuates according to the rotation speed of the motor 5 during a rest period before turning on a or 10b and thereafter reversing the rotation. That is, during the idle period of the normal rotation and the reverse rotation of the motor 5, the bidirectional thyristor 10a,
Since the terminal 10b is off, the terminal voltage of the capacitor 14 becomes 0, but the motor 5 is rotated before the idle period to
, The motor 5 continues to rotate by inertia, and induces a back electromotive voltage in the main coil and the auxiliary coil, and the back electromotive voltage decreases as the rotation speed decreases.
The waveform is as shown in FIG. FIG. 4A shows a case where the load is small and the decrease in the number of revolutions of the motor 5 is small.
(B) is a case where the load is large and the number of revolutions of the motor 5 decreases rapidly. When the load amount is large, the number of rotations of the motor 5 rapidly decreases and the terminal voltage of the capacitor 14 also decreases, so that the load amount such as the cloth amount can be detected. That is,
Decay time of the capacitor voltage (T1a, T1b in FIG. 4),
The load amount is determined by measuring the change rate of the capacitor voltage or the attenuation rate such as the number of voltage waveforms.

The operation of the above construction will be described. To wash a blanket, a blanket is inserted into the blanket washing net 6 as shown in FIG. At this time, the damage prevention film 16 is provided below the blanket washing net 6, so that the blade side surface of the stirring blade 3 is hardly abutted, and the blanket is easy to float, so that the load amount is small. vice versa,
In the case of a towelet 17 other than a blanket, as shown in FIG. 3, the towelet 17 comes into contact with the side surface of the blade of the stirring blade 3, and the towelet 17 is easily hydrated, so that the load becomes large. In this way, since the load amount is large or small with a blanket and a towelet other than the blanket, it is possible to determine, and a determination reference value for the number of capacitor voltage waveforms is set, and a blanket or other than a blanket is determined based on the determination reference value and the number of waveforms. it can. At this time, the number a of the voltage waveforms of the blanket at each water level and the number b of the voltage waveforms of the towelet other than the blanket are as shown in FIG. 5, and the determination reference value may be set therebetween.

Next, the operation flow will be described with reference to FIG. 6. After the water level is set in the initial setting, the water supply is started, and when the water level is detected by the water level detecting means 9, the water supply is stopped and the stirring is started. The motor 5 is agitated 20 to 30 times in the forward and reverse directions, and the number of capacitor terminal voltage waveforms after the motor 5 is turned off during that time is measured. And so on. After this determination, as shown in FIG. 7, the water flow is divided into a water flow for a blanket and a water flow for a towelet other than the blanket and set. The water flow for blankets is conventional right, right, left, left,
It is a reversal of the reversal time period with one cycle of right and left rotation. If the water flow for the towelet other than the blanket is too strong in the left and right rotation direction, the washing water will drip on the floor and the cleaning effect will rotate. Because it is too weak and weakened in reverse, the ON-OFF time of the reversal time, which is one cycle of rotation of right, right, left, left, right, and left as in the case of water flow 1, is shorter than that of the blanket,
The water flow is weakened in the left-right rotation direction, or a simple left-right rotation reversal time limit is used as in the water flow 2. This prevents dripping of washing water on a floor or the like and a decrease in the washing effect even when washing with a large current when washing a towel blanket other than a blanket.

In the above embodiment, the load is determined based on the rotation reduction rate of the stirring blade 3, but the load may be determined according to the rotation reduction rate of the washing tub 1. In this case, the load is determined. The larger the amount, the longer the decay time, and the smaller the load, the shorter the decay time. Conversely, the rate of change of the voltage decreases when the load is large, and increases when the load is small. Further, instead of detecting the capacitor voltage, the current value of the capacitor may be detected. In short, a voltage having a correlation with the back electromotive voltage of the motor 5,
What is necessary is just to detect a current value.

[0013]

According to apparent the present invention from the above embodiment according to the present invention, the load of the washing tub by the counter electromotive voltage of the motor in the rest period after energizing a predetermined time to the motor is also blankets
Has a load amount detecting means for detecting whether it is other than a blanket, and a plurality of water flows having different reversal time periods.
One is a stream for washing blankets,
And a water flow selecting means for selecting one of the flows , wherein the water flow selecting means is configured such that the load amount detecting means detects a load in the washing and dewatering tub.
Wash the blanket when it detects that the load is a blanket
It is so arranged to select the water flow, for example when washing with big water, without impairing the cleaning effect of the blanket,
The washing effect can be improved even with laundry other than a blanket, and a large amount of washing water can be prevented from dripping on a floor or the like.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of a washing machine according to an embodiment of the present invention.

FIG. 2 is a sectional view of the washing machine with a blanket inserted therein.

FIG. 3 is a cross-sectional view of the washing machine with a towelet inserted.

FIG. 4 is a waveform diagram of a capacitor terminal voltage of the load amount detecting means of the washing machine.

FIG. 5 is a characteristic diagram of the water level and the number of waveforms of the capacitor voltage with the laundry as a parameter of the load amount detecting means of the washing machine.

FIG. 6 is an operation flowchart of a main part of the washing machine.

FIG. 7 is a diagram showing a reversal time of a water flow of the washing machine.

FIG. 8 is a diagram showing a time limit for judging a water flow of a conventional washing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Washing tub (washing and dewatering tub) 3 Stirrer blade 5 Motor 7 Control means 13 Capacitor voltage detection circuit (load amount detection means) 15 Water flow selection means

Claims (1)

(57) [Claims] An agitating blade rotatably disposed in a washing and dewatering tub; a motor for inverting the agitating blade to generate a water flow; control means for controlling energization of the motor; The load in the washing and dewatering tub is changed by a blanket or by a back electromotive voltage of the motor during a suspension period after energizing for a predetermined time.
Has a load amount detecting means for detecting whether it is other than a blanket, and a plurality of water flows having different reversal time periods.
One is a stream for washing blankets,
And a water flow selecting means for selecting one of the flows , wherein the water flow selecting means is configured such that the load amount detecting means detects a load in the washing and dewatering tub.
Wash the blanket when it detects that the load is a blanket
A washing machine that will let you choose the water flow for you.