JP4010904B2 - Washing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes a pulsator having a vertical or inclined rotating shaft at the bottom of a washing tub, and by rotating the pulsator in the forward and reverse directions, the washing water in the washing tub is swirled to wash the laundry. It is about.
[0002]
[Prior art]
As a washing machine, a spiral washing machine for washing laundry by friction has been widespread. In the spiral washing machine, the pulsator is rotated to generate a swirling flow in the washing water. As a result, the laundry swirls in the water, and the laundry is subjected to friction washing by friction between the laundry, friction with the inner peripheral wall of the washing tub, or friction with the pulsator. .
[0003]
In such a swirl type washing machine, in order to eliminate uneven washing, as shown in FIG. 5 (a), the rotation of the pulsator (5) is reversed forward and backward, and the water flow of the right turn and the left turn is alternated. It is done to generate.
[0004]
For example, when a clockwise water flow is generated, the pulsator (5) is rotated clockwise as indicated by an arrow a in FIG. 5 (b). At this time, the rotation of the pulsator (5) follows the control process of (1) acceleration → (2) constant speed → (3) deceleration.
(1) In the acceleration control process, the flow (rotational flow) in the direction of rotation of the washing water is low as indicated by the arrow b, so that the washing water is indicated by the arrow c as the pulsator (5) rotates. An upward flow (upward flow) is generated. Next, in (2) constant speed control process, the flow of the washing water is increased as shown by the arrow b, so the speed of the upward flow generated with the rotation of the pulsator (5) is decreased. . Thereafter, in (3) the deceleration control process, the rotational speed of the pulsator (5) decreases as indicated by the arrow a. Accordingly, the rotational flow speed slightly decreases as indicated by the arrow b. The rotating flow maintains a relatively high speed due to inertia. As a result, as the speed of the pulsator (5) decreases, an upward flow is generated in the washing water as shown by the arrow c.
[0005]
As described above, when the pulsator (5) is rotated forward and backward to give an upward flow to the washing water, the washing water in the washing tub is changed up and down, and accordingly, the laundry is also changed up and down. As a result, uneven washing is reduced.
[0006]
[Problems to be solved by the invention]
However, in the conventional washing machine, even when the pulsator is rotated in the forward and reverse directions as described above, the upper and lower parts of the laundry are still insufficient, and the washing unevenness cannot be completely eliminated.
Then, the objective of this invention is providing the washing machine which can accelerate | stimulate the interchange of the upper and lower sides of a laundry effectively.
[0007]
[Means for solving the problems]
The inventors of the present invention have found that the reason why the upper and lower parts of the laundry are insufficiently changed in the conventional washing machine is that the speed of the upward flow decreases in the constant speed control process (2) shown in FIG. In view of this, a pulsator rotation control sequence for generating a higher-speed upward flow in the constant speed control process was devised, and the present invention was completed.
[0008]
A washing machine according to the present invention includes a pulsator arranged at the bottom of a washing tub, a motor that rotationally drives the pulsator, and a control device that controls the rotation of the motor, and a rotation control that rotates the pulsator in one direction. By alternately repeating the stroke and the rotation control stroke that rotates in the opposite direction, the washing water in the washing tub is swirled to wash the laundry.
The control device executes acceleration control for accelerating the rotation of the pulsator, constant speed control for rotating the pulsator at a substantially constant speed, and deceleration control for decelerating the rotation of the pulsator in each rotation control process. In at least one rotation control process of the plurality of times, the pulsator is decelerated and accelerated within the constant speed control to the extent that the rotational flow of the washing water generated by the constant speed rotation of the pulsator is not stopped.
[0009]
Specifically, the control device decelerates and accelerates the pulsator during the constant speed control in each rotation control process.
Alternatively, the control device decelerates and accelerates the pulsator during the constant speed control in a rotation control process that is executed at regular or indefinite intervals.
[0010]
In the washing machine of the present invention, in the acceleration control process, an upward flow is generated in the washing water with the rotation of the pulsator as in the prior art. Next, in the constant speed control process, the speed of the ascending flow accompanying the rotation of the pulsator once decreases as in the conventional case, but at this point, the speed of the rotating flow has increased. As a result of the deceleration of the pulsator, an upward flow is generated in the washing water. Further, since the next pulsator is accelerated in a state where the speed of the rotating flow is reduced by the deceleration of the pulsator, an upward flow is generated in the washing water by the acceleration. In the final deceleration control process, an upward flow is generated in the wash water as the speed of the pulsator is reduced as in the conventional case.
In this way, in any of the acceleration control, constant speed control, and deceleration control for rotating the pulsator in one direction, an upward flow is generated in the washing water, so the washing water has a stronger flow than before. The top and bottom are swapped, and the top and bottom of the laundry is promoted.
[0011]
【The invention's effect】
According to the washing machine according to the present invention, it is possible to effectively promote the replacement of the laundry up and down by a slight change in the rotation control sequence of the pulsator.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
In the washing machine according to the present invention, as shown in FIG. 1, an outer tub (2) is suspended by four suspension rods (3) inside a frame (1), and the inside of the outer tub (2). The washing tub (4) is accommodated so as to be rotatable about a vertical axis.
A lid (11) to be opened and closed when the laundry is put into the washing tub (4) is attached to the upper part of the frame (1). Moreover, the pulsator (5) which gives a swirl flow to washing water is rotatably arrange | positioned at the bottom part of the washing tub (4). On the surface of the pulsator (5), a plurality of mountain-shaped wing pieces extending radially are projected.
In addition, many through-holes (not shown) are opened in the wall surface of the washing tub (4), thereby enabling drainage during the dehydration operation.
[0013]
A water supply nozzle (12) is attached to the frame (1), and washing water is injected into the washing tub (4) through the water supply nozzle (12). A drain hose (13) is connected to the bottom of the outer tub (2), and a drain valve (14) is interposed in the middle of the drain hose (13). The washing water in the washing tub (4) is discharged to the outside through the drainage hose (13) and the drainage valve (14) by opening the drainage valve (14).
[0014]
A clutch (71) and a motor (7) are attached to the back surface of the outer tub (2), and the output shaft of the motor (7) is connected to the pulsator drive shaft (8) and the washing tub drive shaft via the clutch (71). It is connected to the base end of (81). The clutch (71) is switched to rotate only the pulsator (5) in the washing mode and to rotate the washing tub (4) and the pulsator (5) in the same direction in the dewatering mode.
[0015]
As shown in FIG. 2, the operation of the motor (7), the clutch (71) and the drain valve (14) is controlled by a control device (9) composed of a microcomputer or the like. Connected to the control device (9) are input keys (91) to be operated by the user and sensors (92) such as level sensors and timers.
The control device (9) operates in response to input signals from the input keys (91) and sensors (92), and executes a rotation control sequence of the pulsator (5) described later in the washing mode.
[0016]
FIG. 3A shows a rotation control sequence of the pulsator (5). The control process A rotates the pulsator in one direction (clockwise) and the control process rotates the pulsator in the reverse direction (counterclockwise). Two rotation control processes are repeated alternately with B as one period T.
In each rotation control process, acceleration control (1) for accelerating the rotation of the pulsator, constant speed control (2) (5) for rotating the pulsator at a constant speed, and deceleration control (6) for decelerating the rotation of the pulsator In the middle of constant speed control (2) (5), the pulsator deceleration control (3) and acceleration control (4) are executed without stopping the rotational flow of washing water generated by the constant speed rotation of the pulsator. To do.
[0017]
According to the above rotation control sequence, as shown in FIG. 3 (b), first, in the process of acceleration control (1), since the rotational flow of the washing water is low as indicated by the arrow b, the pulsator (5) As shown by arrow c, an upward flow is generated in the wash water.
Next, in (2) constant speed control process, the rotational speed of the washing water increases as shown by the arrow b, so that the speed of the upward flow generated by the rotation of the pulsator (5) is temporarily reduced. Will do. At this time, the speed of the rotating flow has increased.
After that, in the process of (3) deceleration control, the speed of the rotational flow is increased as shown by the arrow b, and therefore the upward flow is generated in the washing water as shown by the arrow c by the deceleration of the pulsator (5). .
[0018]
In the next step (4) of acceleration control, the pulsator (5) is accelerated in a state where the speed of the rotational flow is reduced by the deceleration of the pulsator (5). An upward flow is generated.
After that, in the process of (5) constant speed control, the rotational speed of the washing water is increased as shown by the arrow b, so the speed of the upward flow generated with the rotation of the pulsator (5) is temporarily reduced. To do.
In the last step (6) of deceleration control, the rotational speed of the pulsator (5) decreases as indicated by the arrow a, and accordingly, the rotational flow speed slightly decreases as indicated by the arrow b. However, the rotating flow maintains a relatively high speed due to inertia. As a result, as the speed of the pulsator (5) decreases, an upward flow is generated in the washing water as shown by the arrow c.
[0019]
As described above, among the six controls (1) to (6) for rotating the pulsator in one direction, (1) acceleration control, (3) deceleration control, (4) acceleration control, and (6) deceleration control. In the four control steps, an upward flow is generated in the washing water. In contrast, in the conventional washing water rotation control sequence shown in FIG. 5, among the three controls (1) to (3) for rotating the pulsator in one direction, (1) acceleration control and (3) deceleration. Only an upward flow is generated in the two control strokes of the control.
[0020]
Therefore, according to the rotation control sequence of the washing machine according to the present invention, it is possible to generate a stronger upward flow in the washing water than before, and thereby the washing water becomes a strong flow and is switched up and down. Swap up and down is promoted.
In addition, the rotation control sequence of the washing machine according to the present invention can be realized by a slight change by adding deceleration control and acceleration control during constant speed control of the conventional rotation control sequence, and adopts a complicated control method. Is unnecessary.
[0021]
4 (a) and 4 (b) show another rotation control sequence in the washing machine according to the present invention.
The rotation control sequence shown in FIG. 4A is a rotation control process according to the present invention in which deceleration and acceleration are performed during constant speed control after a pattern T1 that repeats a rotation control process consisting of acceleration, constant speed, and deceleration as in the prior art. The pattern T2 consisting of is added to form a pattern of one period T.
In addition, the rotation control sequence shown in FIG. 4 (b) reverses the pulsator for a short time in the deceleration control (3) and the acceleration control (4) to be executed during the constant speed control (2) (5). In this case, the reverse rotation speed is set to a limit that does not stop the rotational flow of the washing water generated by the constant speed control (2).
4 (a) and 4 (b), it is also possible to generate a stronger upward flow in the washing water than in the past, and this causes the washing water to flow up and down and change up and down. Swapping up and down is promoted.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a washing machine according to the present invention.
FIG. 2 is a block diagram showing a configuration of a control system of the washing machine.
FIG. 3 is a diagram illustrating a rotation control sequence in the washing machine and a direction and a size of a water flow generated by the rotation control sequence.
FIG. 4 is a diagram illustrating another rotation control sequence in the washing machine.
FIG. 5 is a diagram illustrating a rotation control sequence in a conventional washing machine and a direction and a size of a water flow generated thereby.
[Explanation of symbols]
(1) Frame
(2) Outer tank
(4) Washing tub
(5) Pulsator
(7) Motor
(71) Clutch
(9) Control device

Claims (3)

A pulsator disposed at the bottom of the washing tub, a motor that rotationally drives the pulsator, and a control device that controls the rotation of the motor, and a rotation control process for rotating the pulsator in one direction and the opposite direction. In the washing machine for washing the laundry in the previous washing tub by alternately repeating the rotation control process to be performed,
Wherein the control device, at each rotation control stroke of the, and acceleration control for accelerating the rotation of the pulsator, and a constant speed control for rotating the pulsator at a substantially constant speed, and deceleration control for decelerating the rotation of the pulsator is executed, at least one rotation control process of the plurality of times, during the constant speed control, performs a deceleration of the pulsator, characterized in that the acceleration of the pulsator after performing the deceleration wash Machine.   The washing machine according to claim 1, wherein the control device decelerates and accelerates the pulsator during constant speed control in each rotation control process.   The washing machine according to claim 1, wherein the control device decelerates and accelerates the pulsator during constant speed control in a rotation control process that is executed at regular or indefinite intervals.

Images