JP2756201B2 - How to drive the dehydration tub of an electric 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 method for driving a dehydration tub of an electric washing machine.

[0002]

2. Description of the Related Art FIG. 3 shows a general example of a one-tub type fully automatic electric washing machine. A washing tub 2 and a dewatering tub 3 are arranged concentrically inside the outer tub 1, and the washing tub 2 is suspended from the outer tub 1 by a wire 4 in the form of a wire. A washing wing 5 is rotatably arranged at the bottom of the dewatering tub 3, and the washing wing 5 is fixed to a rotating shaft 6 a of a mechanism section 6 arranged below the washing tub 2.

The mechanism section 6 is driven to rotate by a motor 7, and a pulley 8 for transmitting rotation and a rotation number sensor 9 for detecting the rotation number of the pulley 8 are attached to a lower portion. During dehydration, the dehydration tub 3 rotates synchronously with the pulley 8. An upper surface plate 10 is mounted on the upper portion of the outer tub 1, and a power switch and a start switch are mounted on the upper surface plate 10 and an electronic circuit for controlling processes such as washing, drainage, and dehydration is assembled. There are provided 11 operation panels connected to a mounted circuit board (not shown).

Conventionally, the dehydration (including the intermediate dehydration) of the electric washing machine is performed by rotating at a constant low speed S1 (for example, S1 <S2, S: maximum speed) gradually increased after the start of the dewatering tub 3. Detected by the number sensor 9 and turned on the motor 7
FF and a predetermined number of rotations S2 (for example, S / 15 ≦ S2 ≦ S
/ 4), the intermittent control of the rotation / stop between the rotation speeds S1 and (S1-S2), in which the rotation speed sensor 9 detects the rotation speed (S1-S2) reduced by the rotation speed sensor 9 and turns on the power supply to the motor 7 again. A driving method has been adopted in which after a repetitive execution for a certain period (for example, two or three times), the speed is immediately increased to the maximum rotational speed S.

[0005]

In the conventional method of driving a dehydration tub, when the load is relatively large, the rotation of the dehydration tub 3 is restricted by residual bubbles of the detergent in the intermediate dehydration after the washing step. In some cases, the rotation speed did not rise to the maximum number of rotations, resulting in insufficient or impossible dehydration. In addition, since the speed is increased from the one-stage (single) intermittent repetition control of the low-speed rotation speed S1 to the maximum rotation speed S at once, a draining sound (water splashing sound) is generated.
Was high, causing noise.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method of driving a dehydration tub that can operate the dehydration tub accurately, perform complete dehydration, and reduce noise.

[0007]

According to the present invention, in order to achieve the above object, an invention according to claim 1 is a method for starting a dewatering tank.
To the maximum rotation speed.
The drive process that repeats the intermittent control in the
In the method for driving a spin-dryer for a spinning electric washing machine,
In the driving process of the floor, the set rotation speeds of the plurality of stages are respectively
And set the first stage time to 2
It was set longer than the set time after the stage . The invention according to claim 2 is characterized in that the plurality of driving steps are performed by washing
This is performed at the time of intermediate dehydration later .

[0008]

[Action] When drainage is performed after the washing process is completed, when the intermediate dehydration is performed to remove the detergent components, the rotation speed gradually increased after the start of the dehydration tank is the first (first stage) set rotation speed. (For example, when the rotation speed N1), the power supply to the motor is turned off.
F, when the rotation speed reaches a rotation speed (N1-n) reduced by a predetermined rotation speed (for example, rotation speed n), the power supply to the motor is turned on again, and the intermittent control between the rotation speeds N1 and (N1-n) is performed. Is repeatedly executed for a predetermined period T1 (for example, two to three times), and then the same intermittent control is performed at the second set rotational speed (for example, the rotational speed N2) higher than the first set rotational speed N1. Is repeatedly executed for a fixed period T2 (T2 <T1) . As described above, after at least two or more stages of the driving process in which the intermittent control at the mutually different set rotational speed is repeated for a certain period of time are performed, the rotational speed is increased to the maximum rotational speed.

[0009]

An embodiment of the present invention will be described with reference to the drawings.
The configuration of the electric washing machine that implements the dehydration tub driving method according to the present invention is almost the same as that of the conventional one shown in FIG. 3, and includes an outer tub 1, a washing tub 2, a dehydration tub 3, a washing wing 5, and a mechanical unit. 6, a motor 7, a pulley 8, and an operation panel 11 connected to a circuit board (not shown) in which an electronic circuit for controlling the operation of the washing machine is incorporated.
A rotation speed sensor 9 for detecting a rotation speed between the pulley 8 and the pulley 8 capable of transmitting power from the motor is provided.

FIG. 2 is a block diagram showing an outline of an electric system for carrying out a method for driving a spin-drying tub of an electric washing machine according to the present invention. A main control unit 12 for controlling the operation of each unit, and a memory unit 1 for storing at least two or more set rotational speeds in advance
3, a timer section 14 for measuring a fixed time of ON / OFF of the motor relay, a clock control section 15 for controlling the timer section 14, and a power switch 16, a start switch 17 and a rotation speed sensor 9 as input sides.
And a motor relay 19 and an output control unit 21 of a water supply solenoid valve relay 20 on the output side.

Next, a method of driving the dehydration tub according to the present invention will be described with reference to the operation diagram shown in FIG. When the power switch 17 is turned on and then the start switch 16 is operated, a washing step is executed, drainage is performed after completion, and intermediate dehydration is performed after completion. Here, when the motor relay 19 is turned on, the motor 7 starts, the drive is transmitted by the pulley 8, and the spin-drying tub 3 starts rotating via the mechanism 6. The rotation speed sensor 9 outputs the rotation speed of the spin-drying tub 3 that rotates synchronously with the pulley 8, and data is input to the main control unit 12 via the input control unit 18.
First-stage set rotation speed N previously stored in memory unit 13
The operation of the motor relay 19 is continued until it reaches 1 (N1 <N / 2, N: maximum rotation speed), and when it reaches this, it is turned off. At this time, the rotation speed gradually decreases, and when the rotation speed sensor 9 detects N1-n (N / 15 ≦ n ≦ N / 4), the motor relay 19 is turned off again via the control unit 12.
Then, the intermittent control between the rotation speed N1 and (N1-n) is repeated for a set time T1. Thereafter, the second-stage set rotation speed N2 (N2−N1 ≧≧ 2), which is higher than the first-stage set rotation speed N1.
n), the motor relay 19 is turned off,
In 2-n, the intermittent control for turning on the motor relay 41 again is repeated for the set time T2. Here, as shown in FIG.
Time to your will, T1> T2, T3, it is the ....
After at least two or more stages of the driving process of the intermittent control described above are performed, the number of rotations is increased to the maximum rotation speed N.

[0012]

According to the first aspect of the present invention , starting from the dehydration tank is started.
At the specified set speed, until it reaches the maximum speed.
Drive process that repeats intermittent control for a certain period of time
In the method for driving a dehydration tank of an electric washing machine,
The driving process of the plurality of the set number of rotations after each
Set the value as high as possible, and set the first set time to two steps
Since the setting time is longer than the setting time after the floor,
In the first stage, which is low and noisy, you can drain a lot of water
In the second and subsequent stages that are higher than the rotation speed in the first stage
The second stage at the same time as the water draining sound (water splashing sound) can be reduced
Since the amount of drainage in the subsequent steps is reduced,
Efficient dehydration while suppressing noise
You. Further, the second step is performed during the intermediate dehydration after the washing step.
Set the setting time for the floor longer than the setting time for the second and subsequent stages.
The first step is to remove a lot of residual foam from the detergent.
At the time of intermittent control after the second stage and at the maximum speed.
The rotation constraint due to the residual foam of the detergent can be avoided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an operation for implementing a driving method according to the present invention.

FIG. 2 is a block diagram showing an outline of an electric system for implementing the driving method of the present invention.

FIG. 3 is an explanatory view showing a general example of a one-tub type fully automatic electric washing machine.

[Explanation of symbols]

 3 Dehydration tank 8 Pulley 9 Rotation speed sensor 12 Main control unit 13 Memory unit 14 Timer unit 18 Input control unit 19 Motor relay 21 Output control unit

Claims (2)

(57) [Claims] (1) The rotation speed rises to the maximum speed from the start of the dewatering tank.
Intermittent control at a specified set speed for a certain period of time
Dehydration tub of electric washing machine with multiple stages of repeated driving processes
In the driving method, the plurality of driving steps may include setting the set number of rotations in the plurality of steps.
The higher the value, the higher the value.
A method for driving a spin-drying tub of an electric washing machine, wherein the fixed time is set longer than the set time after the second stage . 2. The method according to claim 1, wherein the plurality of driving steps are performed after the washing step.
2. The method for driving a dehydration tub of an electric washing machine according to claim 1, wherein the method is performed at the time of intermediate dehydration .