JPH0523478A - Load quantity detecting device of washing machine - Google Patents

Abstract

PURPOSE:To prevent the influence from exerting on rising caused by an adhering state of cloth and a variation of a water temperature by using a load quantity detecting means at the time of rising, and selecting a water flow pattern based on an output of the load quantity detecting means by a water flow selecting means at the time of this rinsing. CONSTITUTION:The device is provided with a motor 5 for inverting and driving a stirring blade and generating a water flow, a control means 7 for executing electric conduction control to the motor 5, a load quantity detecting means 13 for detecting the load quantity in a washing and dehydrating tank by a back electromotive voltage of the motor in a dormant period after electric conduction is executed to the motor 5 for a prescribed time, and a water flow selecting means 15 for selecting one of plural water flow patterns whose time intervals are different, and the water flow selecting means 15 selects a water flow pattern based on an output of the load quantity detecting means 13, and is used at the time of rinsing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can detect the amount and state of laundry such as clothes put in a washing / dehydrating tub (hereinafter referred to as a washing tub) and change the strength of water flow during rinsing. Regarding the washing machine to do.

[0002]

2. Description of the Related Art Conventionally, in this type of washing machine, as shown in (Table 1), the water flow during rinsing is set by detecting the load amount at the time of washing, and the rinsing water flow has a constant strength and is reversed. It was However, this reversal time period was not suitable for rinsing after intermediate dehydration, and there was a problem.

[0003]

In such a conventional washing machine, the water flow at the time of rinsing is detected by detecting the load amount at the time of washing, as shown in (Table 1). Since the water flow for rinsing after the intermediate dehydration is weak at low water temperature, peeling from the washing tub is poor and the rinsing is reduced. On the other hand, in order to improve the rinse reduction at low water temperature, if the water flow is strengthened by making a long time reversal time so that it can be peeled off from the washing tub, there is a problem that it will affect the deterioration of entanglement or deterioration of cloth wrapping at normal water temperature. I had.

[0004]

[Table 1]

The present invention is to solve the above-mentioned problems, and the load amount detecting means is used at the time of rinsing, and the water flow selecting means at the time of rinsing selects the water flow by the output of the load amount detecting means to cause the edge of the cloth. The purpose is to prevent the influence on the rinse due to the condition of attachment and the change in water temperature.

[0006]

In order to achieve the above object, the present invention provides a stirring blade rotatably arranged in a washing / dehydrating tub, and a motor for driving the stirring blade in reverse to generate a water flow. A control means for controlling the energization of the motor, and a decay rate of the counter electromotive voltage of the motor during a rest period after the motor is energized for a predetermined time by means of A load amount detecting means for detecting the load amount and a water flow selecting means for selecting one of a plurality of water flows having different reversal time limits are provided, and the water flow selecting means for rinsing selects the water flow by the output of the load amount detecting means. This is done as a means for solving the problem.

[0007]

According to the present invention, by the above-mentioned means for solving the problems, the amount and the state of the laundry such as clothes put in the washing tub can be detected, and the strength of the water flow at the time of rinsing can be changed, so that the cloth has a flash. Rinse performance can be improved by preventing the influence of the condition and water temperature on the rinse.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
This will be described with reference to FIG. The same components as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, the washing tub 1 is rotatably arranged in an outer tub 2, and a stirring blade 3 is rotatably arranged at the inner bottom portion thereof. The washing tub 1 and the stirring blade 3 are selectively switched by the mechanical case 4, and the rotational force of the motor 5 is changed to the belt 6
Transmitted by. The control means 7 gives an instruction from the operation key,
Bidirectional thyristors 10a and 10b as switching means for driving the motor 5 and amphoteric thyristor for driving the drain valve magnet 11 and the water supply valve 12, respectively, in response to signals from the power switch 8, the water level detecting means 9, and the like. 10c and 10d are controlled. 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 is reversed. The capacitor voltage detection circuit 13 detects the terminal voltage of the phase advancing capacitor 14 of the motor 5, and its output is input 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 uses the output of the capacitor voltage detecting circuit 13 to energize the motor 5 for a required time, and the load factor in the washing tub 1 and the state of the cloth according to the decay rate of the counter electromotive voltage of the motor 5 during the rest period after the motor 5 is energized for the required time. Is determined.

That is, the terminal voltage of the capacitor 14 is correlated with the rotation speed of the motor 5, and the bidirectional thyristor 10
The terminal voltage of the capacitor 14 is attenuated in accordance with the rotation speed of the motor 5 during the rest period before turning on a or 10b and then reversing the rotation. That is, during the normal rotation and reverse rotation of the motor 5, the bidirectional thyristor 10a,
The terminal voltage of the condenser 14 is 0 because both 10b are in the off state, but the motor 5 is rotated before the rest period to rotate the stirring blade 3
Since the motor 5 continues to rotate due to inertia, the motor 5 induces a counter electromotive voltage in the main coil and the auxiliary coil, and this counter electromotive voltage decreases as the rotation speed decreases, as shown in FIG.
The waveform is as shown in (b). FIG. 4A shows a case where the load amount is small and the decrease in the rotation speed of the motor 5 is small.
On the contrary, (b) is a case where the load amount is large and the rotation speed of the motor 5 rapidly decreases. When the load amount is large, the rotation speed 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 capacitor voltage (T _1a , T _{1b in} FIG. 4) The rate of change of capacitor voltage or the attenuation rate such as the number of voltage waveforms is measured to determine the load amount and the state of cloth.

In the above structure, the operation will be described. If the cloth condition when water is supplied after washing and intermediate dehydration is finished, it is easy to peel from the washing tub as shown in FIG. Since the blade portion of the blade 3 is easily brought into contact with the blade portion, the load amount is increased. On the other hand, as shown in FIG. 3, in the state of being hard to peel off from the washing tub and sticking to the washing tub or the type of being difficult to peel off like low water temperature, the load amount becomes small because it is hard to contact the blade portion of the stirring blade 3. As described above, the amount of load varies depending on the state of peeling from the washing tub, and thus the amount of load can be determined. At this time, the number a of voltage waveforms in a state where it is difficult to peel off and the number b of voltage waveforms in a state of easy peeling at each water level are as shown in FIG.

Next, the operation flow will be described with reference to FIG. 6. In the initial setting, after the control means 7 detects the load amount, the water level is adjusted so that the load amount can be adjusted to a large amount, a medium amount, a low amount and a small amount. The reference value for determining is set to four levels of high, low and small, and water is supplied into the washing tub 1 based on this reference value and the output of the water level detection means 9 and when the set water level is reached, water supply is stopped and the water flow selection means 15 Therefore, washing is performed with a water flow corresponding to each water level and intermediate dehydration is performed. Next, the process moves to rinsing, water is supplied to the initial set water level, and stirring is started to detect the load amount. 20 for motor 5
-30 times of forward / reverse inversion agitation, and motor 5 in the meantime
When the number of capacitor voltage waveforms after turning off is measured, if it is less than the discrimination reference value, it is easily peeled off from the washing tub as shown in FIG. 2 or at normal water temperature. If it is above the discrimination reference value, it is shown in FIG. It is determined that it is hard to peel off from the washing tub, and that it is hard to peel off due to clinging or low water temperature. After this determination, as shown in (Table 2), if it is equal to or lower than the discrimination reference value, the water flow at the time of initialization is set. Increase the OFF time limit and start rinsing.

[0013]

[Table 2]

In the above embodiment, the load amount is determined based on the rotation reduction rate of the stirring blade 3, but the load amount may be determined according to the rotation reduction rate of the washing tub 1. In this case, the load is determined. If the amount is large, the decay time becomes long, and if the load is small, the decay time becomes short. On the contrary, the voltage change rate is small when the load amount is large, and is large when the load amount is small. Also, instead of detecting the capacitor voltage, the current value of the capacitor may be detected. In short, the voltage that correlates with the back electromotive voltage of the motor 5,
It suffices to detect the current value.

[0015]

As is apparent from the above embodiments, according to the present invention, the washing and dehydration is performed by the decay rate of the counter electromotive voltage of the motor during the rest period after the motor is energized for a predetermined time. A load amount detecting means for detecting the load amount in the tank and a water flow selecting means for selecting one of a plurality of water flows having different reversal time limits are provided, and the water flow selecting means for rinsing is determined by the output of the load amount detecting means. Since the water flow is selected, the amount and condition of the laundry in the washing tub after washing and intermediate dehydration can be detected, and the strength of the water flow at the time of rinsing can be changed, and the condition of the edge of the cloth and the water temperature change It is possible to prevent the influence of rinsing on rinsing, improve the rinsing performance, and prevent deterioration of entanglement and cloth wrapping.

[Brief description of drawings]

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

FIG. 2 is a sectional view of the washing machine in a state in which it can be easily peeled off.

FIG. 3 is a sectional view of the washing machine in a state in which it is difficult to peel off.

FIG. 4 is a characteristic diagram of the number of waveforms of the capacitor voltage of the load detection means of the washing machine.

[Fig. 5] Parameter of laundry of load detection means of the washing machine
Water level and capacitor voltage waveform number characteristic diagram

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

[Explanation of symbols]

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

Claims (1)

Claim: What is claimed is: 1. A stirring blade rotatably disposed in a washing / dehydrating tub, a motor for driving the stirring blade in a reverse direction to generate a water flow, and energization of the motor. Control means for controlling and load amount detecting means for detecting the load amount in the washing / dehydrating tub by the decay rate of the counter electromotive voltage of the motor during the rest period after the motor is energized for a predetermined time. And a water flow selection means for selecting one of a plurality of water flows having different reversal time limits, and the water flow selection means at the time of rinsing selects the water flow according to the output of the load amount detection means.