JPH01121096A - Method for controlling dehydrating operation of fully automatic washer - Google Patents

Abstract

PURPOSE: To enable efficient rinsing/dehydrating to be performed without applying too much load to a motor by immediately stopping dehydration when the water level is increased higher than a certain specified water level during dehydration, performing draining again and recovering dehydrating after the lapse of a specified time after the water level is reduced lower than a drain reset water level. CONSTITUTION: When a low speed dehydrating process is started, a motor 8 is continuously rotated in one direction, this rotation is transmitted through a pulley 9, V belt 10, pulley 11 and driving shafts 12a and 12b of a rotation transmitting part 12 to a dehydrating tub 4 and agitator 1 and dehydrating operation is started. The moisture of laundry is discharged from holes 5 by the operation of centrifugal force due to the rotation of the dehydrating tub 4, water is collected by a water tank 7 and drained to the outside of machine by a valve case 17 and drain hose 21. When the water level in the water tank 7 increases higher than a specified water level during the low speed dehydration, dehydration is immediately stopped, drainage is performed and when the water level is lowered lower than a specified water level, after the lapse of certain time, low speed dehydration is recovered.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for controlling the dehydration operation of a fully automatic washing machine.

[Conventional technology]

Figure 3 shows a stirring-type fully automatic washing machine, and (1) in the figure shows a hollow cylindrical body with a large number of through holes (2), and vertically long agitation blades (3) on its circumferential surface. The agitator (4) is a rotor blade arranged radially.
) is located in the center and has a through hole (5) in the side wall, and is a dehydration tank that also serves as a washing tub, and a balancer (6) using a hollow transport body is formed at the upper opening.

A water receiving tank (7) with a waterproof plate (16) provided at the upper end opening is arranged outside the dewatering tank (4), and a drain hose (7) provided with a drain valve (18) at the drain port at the bottom of the water receiving tank (7). 21) via the valve case (17).

In the figure, (8) is a motor, which is connected to a rotation transmission section (12) via a low-speed transmission mechanism consisting of a pulley (9), a belt (10), and a pulley (11). This rotation transmission part (1
2) has a double drive shaft (12a) (12b) that is switched by a spring clutch mechanism (13), and the outer drive shaft (
12a) is the inner drive shaft (12b) in the dehydration tank (4).
are respectively coupled to the agitator (1).

The motor (8) has a detection means (1) for detecting its rotation speed.
4), and a water level detection means (20) is attached to the end of the pressure hose (19) rising from the bulb case (17).
has been established.

Although not shown, these mechanisms are housed in an outer box via vibration isolating means, and a control device (15), a water supply valve (22), and an operation switch section ( 26
) etc.

FIG. 4 is a block circuit diagram of the control system, in which a speed generator using a power generation mechanism is used as the rotation speed detection means (14).

Further, the water level detection means (20) includes a bellows (20e) having an iron core (20b) and a coil (20d) facing the bellows (20e) in the case (20a), and further includes a coil (20d).
0d) is connected to an oscillator (20e).

In the figure, (15) is a control device equipped with a microcomputer, which is connected to a power source (25), and further has a display (24) and an amplifier (23) connected to the motor (
8), a drain valve (18), and a water supply valve (22) are connected.

On the other hand, the input side terminal of the control device (15) is connected to the operation switch section (26), the lid unbalance and other sensors (
In addition to 27), the rotation speed detection means (14) and the frequency division H
A water level detection means (20) is connected via (2B).

Further, as shown in FIG. 3, the spring clutch mechanism (13) is switched by a drain valve (18), although it is not electrically coupled.

Next, the standard washing process of a washing machine with such a configuration will be explained with reference to FIG. (Rinse) - Drain → Low speed dehydration - High speed dehydration"
It is common to repeat this pattern. The operation will be explained according to the flowchart in FIG.

Water is supplied and a specified amount of water is sent to the water receiving tank (7) and the dewatering tank (
4), it controls the forward and reverse operation of the motor (8), the pulley (9), the V-belt (10), and the pulley (
11), via the rotation transmission part (12) (the wing (3)
), the laundry is stirred, and the washing (or rinsing) process is performed (step (a)).

After the specified time, the process moves to the drainage process. In this drainage process, the motor (8) is stopped, and then the drain valve (18) is stopped.
) is activated and water is drained out of the machine via the drain hose (21). On the other hand, from the valve case (17) to the pressure hose (
The control device (15) determines whether the water level has reached a specified water level or below (RESET') using the water level detection means ('20) connected via the water level detecting means ('20) connected through the water level control device (19). If the water level is below the specified level, after the specified time has elapsed (step (b)), the process moves to a low-speed dewatering process.

The action of the water level detection means (20) is to detect the change in pressure with the bellows (20C), detect it as a change in the "L value" of the coil (20d) arranged around the iron core (20b), and detect the change in the LC oscillation circuit. The signal is outputted to an oscillator (20e) having a frequency divider (28), and is captured by a control bag W (15) having a microcomputer via a frequency divider (28) for calculation.

When the motor (8) with the drain valve (18) activated is continuously rotated at low speed in the - direction, the pulley (9) and V-belt (1
0), the dehydration tank (4) rotates together with the stirring blade (3) via the pulley (11) and the rotation transmission part (12), and the water contained in the items to be washed is transferred by the action of centrifugal force through the through hole (5). The water will be drained. At this time, the spring clutch mechanism (13) is switched along with the operation of the drain valve (1st).

After the specified time (step (c)) motor (8)
By rotating at high speed, the process shifts to high-speed dehydration. After a specified time, the high-speed dehydration process ends and the next process begins (step (d)).

Incidentally, FIG. 7 shows examples of rotation of the dehydration tank (4) for low-speed and high-speed dehydration. This figure 7 shows the motor (8) for low speed dehydration.
This is an example obtained by using a 4-pole induction motor and converting the frequency of the power supply to 1/3 of that at high speed.

[Problem that the invention seeks to solve]

Recent washing machines are required to be larger and have a larger capacity. However, on the other hand, installation space is limited, and in order to meet the above-mentioned large capacity, the dehydration tank (4), which also serves as a washing tank, is enlarged, but the outer box is not large, and the water receiving tank (7) However, there is a limit to how large it can be made. As a result, the gap between the water receiving tank (7) and the washing tub (4) in the spin-drying tank naturally becomes narrower, and the amount of water drained during spin-drying increases due to the increased capacity and diversification of laundry loads. (extended hoses, high-position drainage) can lead to various problems such as dewatering stopping midway, rinsing being incomplete, motor temperature rising too high, and the draining process having to be carried out for a long time. arise.

In particular, the water level between the dehydration tank (4) and the water receiving tank (7) temporarily rises, causing the dehydration tank (4) to stir it up and entrain a large amount of foam. Not only does the rotational speed of (4) not increase, but there is a risk that an excessive load will be placed on the motor (8).

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for controlling the dehydration operation of a fully automatic washing machine, which eliminates the disadvantages of the conventional example and allows efficient rinsing and dehydration without placing an excessive burden on the motor.

[Means for solving problems]

In order to achieve the above object, the present invention provides a fully automatic washing machine in which a dewatering tank is provided in a water receiving tank, a rotor is provided in the dehydrating tank, a water level detecting means is provided in the water receiving tank, and the output thereof is introduced into a control device. In the machine, the water level is detected by the water level detection means during the dehydration process, and if the water level exceeds a predetermined level, the dehydration is stopped by the output from the control device, and the dehydration is performed again after the water is drained. That is.

[Effect]

According to the present invention, when the water level rises above a certain specified water level during dehydration, the dehydration is immediately stopped, the water is drained again, and after the water level falls below the drain reset water level, the dehydration is resumed after the specified time has passed. It works like that.

As a result, efficient rinsing and spin-drying can be achieved at low cost without placing an excessive burden on the motor and without causing problems such as stopping midway through spin-drying.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a method for controlling the dehydration operation of a fully automatic washing machine according to the present invention.
It is a flow chart showing an example. The configuration of the fully automatic washing machine used in the method of the present invention is shown in FIG.
Since it is the same as that shown in FIG. 4, the explanation will be omitted.

Water is supplied and a specified amount of water is sent to the water receiving tank (7) and the dewatering tank (
4), it controls the forward and reverse operation of the motor (8), the pulley (9), the V-belt (10), and the pulley (
11), the stirring blade (
3), the laundry is stirred, and the washing (or rinsing) process is performed (step (a)).

After the specified time, the process moves to the drainage process. In this drainage process, the motor (8) is stopped, and then the drain valve (18) is stopped.
) is activated and water is drained out of the machine via the drain hose (2]). On the other hand, from the valve case (17) to the pressure hose (
The control device (15) determines whether the water level has reached a specified water level or below (R[!5IET If the water level is below the specified level, the process moves to the low-speed dewatering process after the specified time has elapsed (step (b)).

Everything up to this point is the same as before. After the draining process is completed, when the low-speed dewatering process begins, the motor (8) continuously rotates in the - direction, and this rotation causes the pulley (9), V-belt (10),
Drive shaft (1) of pulley (11) and rotation transmission section (12)
2a) (12b) to the dehydration tank (4) and agitator (1), and the dehydration operation starts. Dehydration tank (
Moisture in the laundry is discharged from the through hole (5) due to centrifugal force caused by the rotation of step 4), collected in the water tank (7), and drained outside the machine through the valve case (17) and drain hose (21). be done.

If the water level in the water tank (7) rises above the specified water level (for example, Ls in Figure 2) during low-speed dewatering (for example, 300 rpm) (step (g)), immediately stop the dewatering (step (e)). After draining water, if the water level drops below the specified water level (for example, LR in FIG. 2), after a certain period of time (step (to)), the system returns to low-speed dewatering. If the specified water level (for example, Ls in FIG. 2) is below the specified water level during the low-speed dehydration, after the specified time has elapsed, the process moves to the high-speed dehydration (for example, 900 rpm) step (step (c)).

The flow of the high-speed dehydration process is the same as that of the low-speed dehydration process (steps (g) and (d)). When the high-speed dehydration is completed, the dehydration process ends and the process moves on to the next process (step (h)).

In this case, the water level in the water tank (7) is
7) It is detected by the water level detection means (20) connected via the pressure hose (19), and the change in pressure is captured by the bellows (20c) and sent to the coil (20d) arranged around the iron core (20b). It is detected as a change in the "L value" and is output to an oscillator (20e) having an LC oscillation circuit,
The control device (15) with a microcomputer captures it via a frequency divider (28) and performs calculations on the drive unit (motor (8).
), etc.), but the control '4B
As shown in Figure 2, the device (15) is equipped with water level detection means (
20) is input, and the control device (15) gives instructions based on this.

〔Effect of the invention〕

As described above, in the dewatering operation control method of the present invention, a dehydrating tank is provided in a water receiving tank, a rotary blade is provided in the dehydrating tank, a water level detecting means is provided in the water receiving tank, and the output thereof is introduced into a control device. In fully automatic washing machines, even if the dehydration tank that doubles as the washing tank is enlarged to increase capacity and the gap between the dehydration tank and the water receiving tank becomes narrow, it can be done without putting an excessive burden on the motor. This enables efficient rinsing and spin-drying to be achieved at low cost without causing problems such as poor washing due to a stop in the middle of spin-drying.

[Brief explanation of the drawing]

Fig. 1 is a flowchart showing one embodiment of the dewatering operation control method for a fully automatic washing machine of the present invention. Fig. 2 is a characteristic diagram showing the output characteristics of the water level detection means. Fig. 3 is a stirring type fully automatic washing machine. A longitudinal side view of the washing machine, Fig. 4 is a block circuit diagram of the control system as above, Fig. 5 is a flowchart showing a conventional example, Fig. 6 is a standard washing process diagram, and Fig. 7 shows the rotation speed of the dehydration tank. It is a characteristic diagram. (1)... Agitator (2)... Through hole (3)
...Agitation blade (4) ...Dehydration tank (5) ...Through hole (6) ...Balancer (7) ...Water tank (8) ...Motor (9) ...Pulley ( 10)...V-belt (11)...Pulley (]2)...Rotation transmission part (12a) (12b)
-... Drive shaft (13)... Spring clutch mechanism (14)... Rotation speed detection means (15)... Control device (16)... Waterproof plate (17)... Valve case (18) )... Drain valve (19)... Impulse hose (20)... Water level detection means (20a)...
Case (20b)... Iron core (20c)...
...Bellows (20d) ...Coil (20e
) ... Oscillator (21) ... Drain hose (22
)...Water valve (23)...Amplifier (24)
... Display (25) ... Power supply (26)
...Operation switch part (27) ... Lid, unbalance and other sensor parts (28) ... Frequency divider agent Patent attorney Daikun Masato Figure 1 Figure 2 Figure 5

Claims (1)

[Claims] In a fully automatic washing machine, a dehydration tank is provided in the water receiving tank, a rotary blade is provided in the dehydrating tank, and a water level detection means is provided in the water receiving tank, and the output thereof is input to the control device.The water level is also detected during the dehydration process. A spin-driving operation control for a fully automatic washing machine, characterized in that the water level is detected by a means, and when the water level exceeds a predetermined level, the spin-drying is stopped by an output from the control device, and the spin-drying is performed again after draining. Method.