JPS586519B2 - electric washing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric washing machine that detects the state of water flow in a washing tank and controls the drive speed of the motor or the cycle of intermittent drive to wash the items with the optimal water flow. The purpose of this system is to perform rinsing, prevent fabric staining, and increase washing efficiency.It detects fluctuations in the water level on the washing tank wall in response to changes in the water flow in the washing tank, and uses this to drive the motor. It is an attempt to control the

In conventional electric washing machines, the water flow inside the washing tank is
A water flow switching knob on the washing machine operation panel switches between strong water flow, weak water flow, etc., and the structure allows the user to uniquely set the water flow regardless of the condition of the fabric in the washing tank.

For this reason, when washing is usually performed, operations must be performed according to the amount of cloth, which is complicated, and the selection of water flow also requires a great deal of empirical judgment.

Furthermore, if the water flow is incorrectly set, there are many inconveniences such as the water flow being stronger than necessary, which may cause staining of the cloth, or the water flow being too weak, making it impossible to obtain a sufficient cleaning effect.

The present invention solves the above-mentioned conventional drawbacks, and embodiments thereof will be described below with reference to the drawings.

FIG. 1 shows an example of the case where the present invention is applied to a fully automatic washing machine. In the figure, 1 is a washing and dewatering tank, 2 is an outer tank, 3 is an agitating blade, and 4 is a motor.

5 is a water level detection device that extracts the water level in the washing tub as pressure and converts it into electrical output; 6 is a data storage device that stores a preset reference water level; and 7 is data obtained from the water level detection device 5 during the washing operation. This is a comparison device that compares and determines the data set in advance in the data storage device 6.

Reference numeral 8 denotes a motor control device that controls the drive of the motor 4 in accordance with the signal from the comparison device 7.

In the above configuration, data on the reference water level obtained from the water level detection device 5 immediately after water supply or data set in advance is stored in the data storage device 6, and when the washing operation is subsequently performed, the water level detection device 5 Data on water level fluctuations on the outer tank wall surface in response to changes in water flow during washing can be obtained from the washing machine, and can be compared and judged by the comparison device 7.

Here, the water surface in the washing and dehydrating tank 1 during the washing operation has a concave shape as shown in Fig. 2, and the stronger the water flow in the washing and dehydrating tank 1, the larger the dent in the center of the water surface becomes. Since the water level on the inner wall of the washing and dehydrating tank becomes high, the state of the water flow inside the washing machine can be indirectly detected based on this water level.

Furthermore, at this time, the rotation of the agitating blade 3 causes the movement of water flowing from between the washing/dehydrating tank 1 and the outer tank 2 through the back surface of the agitating blade 3 into the washing/dehydrating tank 1, as shown in FIG. Therefore, if the dewatering hole in the wall of the washing/dehydrating tank 1 is small as shown in Figure 2a, the amount of water flowing from this hole to the outer tank is relatively small, and the water level B near the outer tank wall is based on the data. The water level becomes lower than the reference water level A stored in the storage device 6.

On the other hand, when the dehydration hole is large as shown in Figure 2b, the amount of water flowing out from the dehydration hole is large, and the water level C on the outer tank wall is almost the same as the water level on the inner wall of the washing/dehydration tank, which is the standard. The water level will be higher than water level A.

Therefore, if the data in the data storage device 6 is set to a water level that is a certain amount lower or a certain amount higher than the reference water level A, depending on the size of the dehydration hole, etc., the water flow in the washing and dehydration tank can be controlled. The condition is judged by the comparator 7, and a signal is sent to the motor control device 8, which causes the motor 4 to move the stirring blade 3.
can control the operation of

Here, in the present invention, as an example of a water level detecting device, an application example of a conventionally used pressure detecting device is shown. Any type of washing machine that can detect the water level on the inner wall surface of the tank is sufficient, and it does not have to be a type of washing machine that has a washing and dehydration tank as shown in the example, but a type of washing machine that generates a water flow by rotating an agitating blade to wash the water. A washing machine is fine.

As described above, according to the present invention, the state of the water flow during the washing operation is taken out by the water level detection device as water level fluctuation on the inner wall surface of the outer tank, and compared with the data in the data storage device set in advance by the comparison device. The motor can be controlled through the motor control device and feedback control can be performed to control the state of the water flow, eliminating the need for the user to set the water flow based on empirical judgment as in the past. It can automatically wash with the optimal water flow depending on the situation.

For this reason, there is less damage to the fabrics of the items being washed, no matter who washes them.
This provides excellent effects such as efficient washing.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the control system of an electric washing machine in an embodiment of the present invention, and FIG. 2 shows the state of water during washing.
Figure a is a schematic cross-sectional view when the dehydration hole is small, and Figure b is a schematic cross-sectional view when the dehydration hole is large. 1...Washing and dehydration tank, 2...Outer tank,
4...Motor, 5...Water level detection device,
6...Data storage device, 7...Comparison device, 8...Motor control device.

Claims (1)

[Claims] 1. A motor control device to adjust the water flow during washing and rinsing, a water level detection device to detect the water level on the inner wall of the washing tank, and a comparison device to compare and judge the water level detected by this device with a preset reference water level. and a data storage device storing reference water level data, the water level detecting device detects the water level on the inner wall of the washing tank, which changes depending on the state of the water flow, and sends a signal to the motor control device through the comparing device to control the rotation of the motor. An electric washing machine characterized in that the water flow is adjusted by controlling the water flow.