JPH0513350Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields The present invention relates to a washing machine.

(b) Conventional technology As a conventional example, by rotating the washing tub and the rotary blades alternately, the washing effect is improved by adding the scrubbing effect due to the rotation of the rotary blades to the pushing washing effect due to the rotation of the washing tub. JP-A-62-
It is shown in Publication No. 240095 (D06F33/02).

(c) Problems to be solved by the invention In the conventional example described above, since the rotational speed of the washing tub and the rotor blades is constant, the water flow generated by the rotation of the washing tub and the rotor blades is also standardized. The movement of the cloth became regular, making it easy for cloth to get tangled.

In view of these problems, the present invention aims to improve the washing performance of a washing machine.

(E) Means for Solving the Problems The washing machine of the present invention includes a washing tub, a rotary blade disposed at the bottom of the washing tub, a means for supplying water into the washing tub, and a mechanism for rotating the washing tub. means for rotating the rotary blade, means for varying the rotational speed of each of the rotating means, and control means for controlling the operation of each of the rotating means and the variable means, and the control means is configured to control the operation of the water supply means by the water supply means. After water is supplied, the first rotation is performed by rotating the washing tub.
The cleaning device includes means for alternately performing a cleaning operation and a second cleaning operation by rotating the rotary blade, and means for changing the number of rotations of the washing tub and the rotor for each cleaning operation.

(e) Effect: In other words, the scrubbing action caused by the rotation of the rotary blade is added to the pushing washing action caused by the rotation of the washing tub. In addition, by changing the number of rotations of the washing tub and rotary blades for each washing operation, the water flow is varied, making the movement of the cloth irregular and making it difficult for the cloth to get tangled.

(f) Examples Embodiments of the present invention will be described based on the drawings.

In the washing machine shown in FIG. 1, 1 is a machine frame, 2 is an outer tub elastically supported within the machine frame 1 by a hanging rod 3;
4 is a drain port provided at the bottom of the outer tank 2, 5 is an upwardly expanding tapered inner tank (corresponding to a washing tub) provided inside the outer tank 2, and 6... is a drain port provided at the bottom of the outer tank 2. A dewatering hole is provided only in the upper part, 7... is a buttful (corresponding to a wing body) integrally formed vertically along the inner wall of the inner tank 5, and 8 is a balance ring at the upper part of the inner tank. The inner tank 5 is supported in the outer tank 2 by a cylindrical shaft 9, and the cylindrical shaft 9 and the first drive motor 1
0 through a pulley 11. Reference numeral 12 denotes a rotary blade disposed at the bottom of the inner tank 5, and its drive shaft 13 passes through the inside of the cylindrical shaft 9 and is connected to a second drive motor 14 via a pulley 15. 1
6 is a brake drum of the cylindrical shaft 9, 17 is a brake drum of the drive shaft 13, 18 is a heater provided near the bottom of the outer tank 2, and 19 is a brake drum of the inner and outer tanks 5, 2.
a water supply device for supplying water between the two; 20 is a top lid; 21
An air trap is provided at one corner of the bottom of the outer tank 2 to detect the water level in the outer tank 2, and is connected to a water level switch (not shown) via a pressure hose 22. Reference numeral 23 denotes a circulation waterway that communicates between the drain port 4 and the upper part of the inner tank 5, and 24 is a pump installed in the circulation waterway 23, which pumps up water between the inner and outer tanks, discharges it from the discharge port 25, and pumps the water between the inner and outer tanks. Supplied into tank 5. 26 is a drain solenoid valve interposed between the drain port 4 and the drain hose 27.

FIG. 2 shows a specific circuit diagram, in which 28 is a control device that controls the operation of each load based on inputs from various operation switches 29, and a microcomputer that is the center of control and commands from the microcomputer. A drive circuit is implemented to operate each load based on the following.

30 is a safety switch linked to opening and closing of the upper lid 20, 31 is a water supply solenoid valve, 32 is a solenoid for operating a brake on the inner tank 5, 33 is a solenoid for operating a brake on a rotating body, and 34 is a pump motor. 35 is a water level switch, and when the water level reaches a specified water level, the contact switches from the NO side to the NC side, and at the same time cuts off the energization circuit to the heater 18.
36 is a thermistor for temperature adjustment, and 37 is a frequency converter that controls the frequency related to the rotation speed of the first and second drive motors 10 and 14.
Since the rotational speed of the motors 10 and 14 is proportional to the frequency, the power supply frequency of 60Hz (50Hz) is converted to obtain the desired rotational speed.

The operation will be explained based on this configuration.

When you operate the start switch (not shown),
The water supply electromagnetic valve 31 is opened, and water supply between the inner and outer tanks 5 and 2 is started. When the water level reaches a specified value and the pressure switch 35 is switched from the NO side to the NC side, the heater 18 is cut off and stops heating the water. At the same time, the water supply electromagnetic valve 31 is closed, the pump motor 34 starts operating, and the water between the inner and outer tanks 5 and 2 is transferred from the discharge port 25 into the inner tank 5.

As shown in FIG. 3, the first drive motor 1
0, and repeat the cycle of rotating the inner tank 5 clockwise (about 2 to 4 seconds) - stopping (about 1 to 3 seconds) - counterclockwise (about 2 to 4 seconds) - stopping for about 2 to 3 minutes (this cycle (The rotation of the inner tank is referred to as a first cleaning operation).
2 in the opposite direction to the rotation of the inner tank 5 (if the inner tank 5 was rotating to the right, it will rotate to the left, and if it was rotating to the left, it will rotate to the right). (referred to as a second cleaning operation), a cleaning process is performed. That is, in the cleaning process, the first cleaning operation and the second cleaning operation are repeated alternately.

Furthermore, in this embodiment, the frequency conversion device 37
Accordingly, as shown in FIG. 4, the inner tank 5 and the rotor blade 1
2. Change each rotation speed stepwise. That is, each time the first cleaning operation is performed, the rotation speed of the inner tank 5 is changed.
60r.pm→100→140→180→140→100→60→100→
..., and each time the second cleaning step is performed, the rotation speed of the rotor blade 12 is changed from 180r.pm→100→60→
Change as 100→180→100→...

During this washing process, the laundry in the inner tub 5
As the baffle 7 and rotor blade 12 rotate,
When the tank is stopped, the water collides with the baffle 7 and the rotary blade 12, thereby performing washing. When the inner tub 5 is stopped, the rotary blades 12 are rotated in the opposite direction to the rotation of the inner tub 5, thereby loosening the laundry that has become twisted and tangled during the rotation of the inner tub 5, and at the same time loosening the laundry. Scrub and wash.

Further, since the rotational speed of the inner tank 5 and the rotary blade 12 changes each time they rotate, the strength of the water flow generated during each rotation differs, resulting in a complicated water flow within the tank. Therefore, the movement of the laundry becomes irregular and it becomes difficult for the laundry to get tangled.

Here, when the inner tub 5 is stopped, simply cutting off the power to the first drive motor 10 causes the tub 5 to rotate due to inertia, and the direction of this inertial rotation is the same as the floating direction of the laundry. Therefore, the collision force of the laundry against the washcloth 7 is weakened, and the cleaning power is also reduced.
Therefore, the power supply to the first drive motor 10 is cut off, and at the same time, a brake is applied to the rotation of the inner tank 5. This braking means uses a combination of mechanical means that tightens the brake band by cutting off the current to the solenoid 32 and electrical means that applies a direct current to the first drive motor 10, which are conventionally well known techniques.

In this way, by abruptly stopping the inner tub 5, the collision force of the laundry against the buttful 7 is increased,
Improves the effectiveness of “pound washing”.

When the cleaning process is completed, a deliquidation process starts for approximately 30 seconds to 1 minute by rotating the inner tank 5 in the clockwise direction at high speed. That is, as the inner tub rotates at high speed, the washing liquid in the tub is discharged from the dewatering holes 6 and the upper opening of the tub due to centrifugal force along the tapered shape of the tub, and the draining is completed.

In this dewatering process, dirt is separated from the laundry and removed by passing the laundry liquid at high speed between the fibers of the laundry.

Now, the discharged washing liquid is transferred to the inner and outer tubs 5 and 2.
This washing liquid is pumped again to pump 2.
4, the second cleaning process (approximately 1 to 3 minutes) starts at the same time as returning to the inner tank 5.

Thus, the washing step and the draining step are repeated twice, and during the final draining step, the drain electromagnetic valve 26 is opened to drain the washing liquid, and the "washing" of the laundry is completed.

As described above, according to the washing machine of this embodiment, the fifth
As evidenced by the experimental results shown in FIGS. 7 to 7, superior cleaning performance can be obtained compared to the conventional method.
In the figure, the solid line shows this embodiment, and the dotted line shows the conventional example (in which the rotational speed is not changed stepwise).
The reduction rate in FIG. 7 is a ratio of the weight difference before and after washing, and the higher the degree of damage to the fabric, the larger the weight difference before and after washing, so the reduction rate becomes higher.

(g) Effects of the invention The washing machine of the invention has a high cleaning efficiency because it combines the push washing action caused by the rotation of the washing tub with the scrubbing action caused by the rotation of the rotary blades.

Moreover, by changing the rotational speed of the washing tub and the rotary blades for each washing operation, the water flow is changed, so that the movement of the cloth becomes irregular and it is difficult for the cloth to get tangled.

Therefore, overall, the washing performance is excellent.

[Brief explanation of the drawing]

Figure 1 is an internal mechanism diagram of the washing machine of the present invention, Figure 2 is its electric circuit diagram, Figures 3 and 4 are its time charts, and Figures 5 to 7 are cleaning characteristics diagrams based on experiments. be. 5... Inner tub (washing tub), 10... First drive motor (rotating means for the washing tub), 12... Rotating blade, 14
...Second drive motor (rotor blade rotation means), 19
... Water supply device (water supply means), 28 ... Control device (control means), 37 ... Frequency conversion device (rotational speed variable means).

Claims (1)

[Scope of utility model registration request] A washing tub, a rotary blade disposed at the bottom of the washing tub, a means for supplying water into the washing tub, a means for rotating the washing tub, a means for rotating the rotary blade, and a rotation of each of the rotating means. a control means for controlling the operation of each of the rotating means and the variable means,
The control means includes means for alternately performing a first washing operation by rotating the washing tub and a second washing action by rotating the rotary blade after water is supplied by the water supplying means; A washing machine comprising: means for changing the number of rotations for each washing operation.