JPH04352993A - Dewatering tank driving method for electric washing machine - Google Patents

Abstract

PURPOSE:To decrease a dewatering noise in each step so as to contrive lowering of the noise by interposing at least two steps or more of driving processes, where interrupted control with a mutually different preset rotational speed is repeated for a fixed period, during the time from starting a dewatering tank to rising to a maximum rotational speed. CONSTITUTION:In a dewatering process after draining water by ending a washing process, a motor relay 19 is turned on to turn a dewatering tank by a motor, but here, a rotational speed of the dewatering tank is detected by a rotational speed sensor 9. Action of the motor relay 19 is continued before reaching a preset rotational speed N1 of the first step, stored in a memory part 13, to turn off this relay after reaching the speed N1, by a main control part 12. In this way, the rotational speed is gradually decreased, and when it reaches a rotational speed N1-n, continuous control of again turning on the motor relay 19 is performed for a preset time T1. Next, when the rotational speed rises to N2(>N1), the motor relay 19 is turned off, and continuous control for again turning on the motor relay 19 at N2-n is repeated for a preset time T2.

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 tank of an electric washing machine.

0002

2. Description of the Related Art A general example of a single-tank fully automatic electric washing machine is shown in FIG. Inside the outer tub 1, a washing tub 2 and a dehydration tub 3 are arranged concentrically, and the washing tub 2 is suspended from the outer tub 1 by a wire rod 4. Further, a washing wing 5 is rotatably arranged at the bottom of the dehydration tub 3, and the washing wing 5 is fixed to a rotating shaft 6a of a mechanism section 6 arranged at the lower part of the washing tub 2.

The mechanism section 6 is rotatably driven by a motor 7, and a pulley 8 for transmitting rotation and a rotation speed sensor 9 for detecting the rotation speed of the pulley 8 are attached to the lower part. During dehydration, the dehydration tank 3 rotates synchronously with the pulley 8. Further, a top plate 10 is attached to the upper part of the outer tank 1, and a power switch and a start switch are attached to this top plate 10, and an electronic circuit for controlling processes such as washing, draining, and dewatering is installed on this top plate 10. An operation panel 11 connected to a built-in circuit board (not shown) is provided.

Conventionally, dehydration (including intermediate dehydration) of such an electric washing machine is performed at a constant low speed S1 (for example, S1<S2, S: maximum rotation speed) that gradually increases after starting the dehydration tank 3.
is detected by the rotation speed sensor 9 and the power to the motor 7 is turned off.
and a predetermined rotation speed S2 (for example, S/15≦S2≦S/4
) is detected by the rotation speed sensor 9.
After repeating the intermittent rotation/stop control between the rotation speed S1 and (S1-S2) for a certain period of time (for example, 2 to 3 times), in which the motor 7 is turned on again when the motor 7 is energized, the maximum rotation speed is detected. A driving method was adopted in which the temperature was raised to S.

[0005]

[Problems to be Solved by the Invention] In the conventional dehydration tank driving method, when the load is relatively large, the rotation of the dehydration tank 3 is restricted by residual detergent foam during intermediate dehydration after the washing process. In some cases, the rotation speed did not reach the maximum, resulting in insufficient or impossible dehydration. Further, since the intermittent repeating control of one stage (single) low speed S1 is suddenly increased to the maximum speed S, the sound of water splashing (water splashing) is high and causes noise generation.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for driving a dehydration tank that allows for accurate operation of the dehydration tank to perform complete dehydration, and that produces less noise.

[0007]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides constant intermittent control at different set rotational speeds from the start of the dehydration tank until the rotational speed increases to the maximum rotational speed. This is due to the intervention of at least two or more stages of driving processes that repeat for a period of time.

[0008]

[Operation] When performing intermediate dehydration to remove detergent components after the washing process is completed and the water is drained, the rotation speed that gradually increases after starting the dehydration tank is the initial (1st stage) set rotation speed. (For example, when the rotation speed reaches N1, the power to the motor is turned off.)
F, and when the rotational speed reaches the rotational speed (N1-n), which is lowered by a predetermined rotational speed (for example, rotational speed n), the power to the motor is turned on again, and intermittent control is performed between the rotational speed N1 and (N1-n). After repeating this for a certain period of time (for example, 2 to 3 times), the same intermittent control as described above is performed at the second stage set rotation speed (for example, rotation speed N2) that is higher than the first stage set rotation speed N1. Execute repeatedly for a certain period of time. In this way, after performing at least two or more stages of the driving process in which intermittent control is repeated for a certain period of time at different set rotational speeds, the rotational speed is increased to the maximum rotational speed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described with reference to the drawings. The configuration of an electric washing machine that implements the dehydration tank driving method according to the present invention is almost the same as that of the conventional one shown in FIG. 6, a motor 7, a pulley 8, and an operation panel 11 connected to a circuit board (not shown) incorporating an electronic circuit for controlling the operation of the washing machine.
A rotation speed sensor 9 is provided to detect the rotation speed between the pulley 8 and the pulley 8 which can transmit power from the engine.

FIG. 2 is a block diagram showing an outline of an electrical system for carrying out the method for driving a dehydrating tank of an electric washing machine according to the present invention. A main control unit 12 that controls the operation of each part, and a memory unit 13 that stores in advance the set rotation speed of at least two or more stages.
, has a timer section 14 that measures a certain period of time for ON and OFF of the motor relay, and a clock control section 15 that controls the timer section 14, and further includes a power switch 16, a start switch 17, and a rotation speed sensor 9 on the input side. An input control section 18 is provided, and an output control section 21 for a motor relay 19 and a water supply solenoid valve relay 20 is provided on the output side.

Next, the dehydration tank driving method of the present invention will be explained with reference to the operational diagram shown in FIG. When the power switch 17 is turned on and then the start switch 16 is activated, a washing process is executed, and after completion, drainage is performed, and after completion, intermediate dehydration is performed. Here, when the motor relay 19 is turned on, the motor 7 is started, and the drive is transmitted by the pulley 8 and the dehydration tank 3 starts rotating via the mechanism section 6. The rotation speed sensor 9 outputs the rotation speed of the dehydration tank 3 that rotates synchronously with the pulley 8, and the data is input to the main control section 12 via the input control section 18.
The first stage set rotation speed N stored in the memory section 13 in advance
1 (N1<N/2, N: maximum rotation speed), and when the motor relay 19 reaches the maximum rotation speed, 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 on again via the control section 12.
N, and the intermittent control between the rotational speed N1 and (N1-n) is repeated for a set time T1. After that, the second stage set rotation speed N2 (N2-N1≧
When the temperature rises to n), turn off the motor relay 19 and
At step 2-n, the intermittent control of turning on the motor relay 41 again is repeated for a set time T2. Here, it is also possible to set T1=T2=T3... After performing the intermittent control drive process in at least two stages as described above, the rotation speed is increased to the maximum rotation speed N.

0012

Effects of the Invention The present invention intervenes in a driving process that repeats intermittent control at at least two stages of mutually different set rotational speeds between the startup of the dehydration tank and the rise to the maximum rotational speed. Since the rotation speed is gradually increased to the maximum speed over a certain period of time after startup, the sound of water draining at each stage (
The noise can be suppressed by reducing the sound of water splashing, and rotation restriction due to residual detergent foam can be avoided.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the operation of implementing the driving method of the present invention.

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

FIG. 3 is an explanatory diagram showing a general example of a single-tank fully automatic electric washing machine.

[Explanation of symbols]

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

Claims (1)

[Claims] Claim 1: An electrical system comprising at least two or more stages of a driving process in which intermittent control at different set rotational speeds is repeated for a certain period of time between the activation of the dehydration tank and the rise to the maximum rotational speed. How to drive a washing machine's dehydration tank.