JPH05131090A - Method of dehydration operation of washing machine - Google Patents

Abstract

PURPOSE:To conduct the operation of a dehydration tank motor alternatively with two modes of a high speed rotation number and a low speed rotation number by equipping a simple and inexpensive device. CONSTITUTION:A frequency converting means consisting of an AC clock circuit 22 into which power supply frequency voltage to be impressed on a hydration tank motor 8 is inputted and which outputs a clock signal by conducting the corrugated forming of this voltage, a control circuit 20 which inputs the clock signal of the AC clock circuit 22 and output from an operation portion 23 and outputs a control signal to a frequency converter 21, and the frequency converter 21 which impresses the specific portion of the power supply frequency on the motor 8 on the basis of a control signal from the control circuit 20, is connected to the motor 8. And the dehydration operation of the motor 8 from start to finish is conducted by means of output from the frequency converting means and at either of high speed rotation and low speed rotation of about 1/3-1/2 of the high speed rotation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine operation control method, and more particularly to a dehydration operation method.

[0002]

2. Description of the Related Art First, the overall structure of a washing machine will be described with reference to a vertical side view of FIG. 3. The drawing shows a fully automatic one-tank agitating type, wherein 1 is a hollow cylinder having a large number of through holes 2. An agitator 4 having radial agitation blades 3 longitudinally arranged around the body on its peripheral surface is a dehydration tank in which the agitator 1 is disposed at the center and a through hole 5 is provided in a side wall, and a balancer is provided at an upper end opening thereof. 6 is formed. Reference numeral 7 denotes a water receiving tank provided outside the dehydrating tank 4, which is not shown in the drawing, but is provided with a drain port to which a drain pipe is connected.

Reference numeral 8 in the drawing denotes a motor, which is connected to the rotation transmitting portion 12 via a deceleration transmitting mechanism of a pulley 9, a V belt 10 and a pulley 11. The rotation transmission unit 12 has double drive shafts 12a and 12b which are switched by the spring clutch mechanism 13, the outer drive shaft 12a is connected to the dehydration tub 4, and the inner drive shaft 12b is connected to the agitator 1. To do.

Although not shown, these mechanisms are
All of them are housed in the exterior via a vibration isolation means, and an operation section accommodating a control device and operation switches is provided above the exterior.

Outputs from other detectors such as water level detectors are introduced into this control device, and outputs from the control device include a drive circuit of the motor 8 and a valve control circuit such as a water supply valve and a drain valve. Introduced in part.

In order to carry out the washing, rinsing and dehydrating operations in this way, the item to be washed, water and detergent are put in the dehydrating tank 4,
When the power is turned on, the motor 8 rotates alternately in forward and reverse directions, and the agitator 1 also swings accordingly. After a certain amount of time has been reached by the timer function in the control device, drainage is performed and the process proceeds to the dehydration process.

By the way, when the dehydration process is started, the spring clutch mechanism 13 is switched, the shaft 12a is rotated together with the shaft 12b, and the motor 8 is continuously rotated only in one direction. Along with that, the dehydration tub 4 rotates via the pulley 9, the V-belt 10, the pulley 11, and the rotation transmission unit 12, but the rotation speed of the dehydration tub 4 is given by the reduction ratio of the pulleys 9 and 11, and the rotation of the motor 8 The number is determined by the number of poles. In the induction motor, the rotation speed is 900 rotations / minute, and the dehydration operation is performed at this rotation speed.

Recently, clothes made of wool or thin and delicate fiber clothes, which are so-called fashionable clothes, are often washed with a household washing machine. However, even in such a case, in the conventional dehydration operation, only a uniform rotation speed can be obtained, and since this is a high rotation speed of 900 rotations / minute, the clothes to be washed such as the wool product can also be rotated at this rotation speed. As a result of the dehydration operation, the centrifugal force acted so strongly that the product was dehydrated too much, that is, cloth was messed up, its shape was lost, and wrinkles were generated. Further, such inconvenience cannot be dealt with even if the dehydration time is shortened or the dehydration tank is turned on and off by a timer action.

Therefore, it is considered that the motor 8 can be operated in two modes of high-speed rotation and low-speed rotation so that the dehydration operation can be selectively performed by either high-speed rotation or low-speed rotation. Be done. One of them is JP-A-57-1.
This is a method of controlling the motor by an inverter as described in Japanese Patent No. 60496. As another method, a special motor capable of switching the number of poles such as 4 poles / 6 poles and 2 poles / 4 poles is used for the motor 8 as disclosed in Japanese Patent Laid-Open No. 51-18157. This is a method in which the rotation speed of the motor can be changed by switching the taps.

[Problems to be Solved by the Invention]

However, in the method of controlling the motor by the inverter, a power conversion circuit for converting a commercial power supply, which is an AC power supply, into a DC power supply, and a DC power supply for converting the DC power supply converted by the power conversion circuit into an arbitrary frequency. The frequency conversion circuit and the direct-to-AC conversion circuit for applying the frequency-converted DC power supply to the motor are required, and the apparatus itself is considerably large and expensive.

If a special motor capable of switching the number of poles is used, the motor itself becomes expensive.

The object of the present invention is to eliminate the disadvantages of the prior art and to make it possible to selectively operate the rotation speed of the motor in two modes of high speed rotation and low speed rotation with a simple and inexpensive device, such as cotton. It is an object of the present invention to provide a dewatering operation method for a washing machine, which can finish not only durable to-be-washed articles but also to-be-washed articles made of delicate fibers such as wool products without impairing the texture.

[0013]

In order to achieve the above-mentioned object, the present invention is an AC in which a voltage of a power supply frequency applied to the motor is input to a dehydrating tank motor, which is waveform-shaped to output a clock signal. A clock circuit, a control circuit for inputting a clock signal of the AC clock circuit and an output from the operating unit, and outputting a control signal to a frequency converter, and a specific portion of the power supply frequency based on the control signal from the control circuit circuit. Is connected to a frequency conversion means composed of a frequency converter, and the motor is rotated at a high speed or at a low speed of about 1/3 to 1/2 thereof from the start to the end of dehydration by the output from the frequency conversion means. The main idea is to carry out dehydration operation in either one.

[0014]

According to the present invention, the number of low speed rotations of the dehydration tub set by the operating portion is input to the control device.
On the other hand, in the AC clock circuit, the input in phase with the power supply frequency applied from the power supply to the motor is shaped into a sine half-wave rectangular wave that matches the input of the control device, and the control device receives both inputs and outputs it to the frequency converter. In the frequency converter, a specific part of the power supply frequency is applied to the motor. As a result, the rotation speed of the motor, which is an induction motor, also becomes a low rotation speed, and the rotation speed of the dehydration tank also becomes a low rotation speed of about 1/3 to 1/2 of the normal high speed rotation. Thus, the material to be washed in the dehydration tank is dehydrated by the low speed rotation.

By inputting the frequency conversion means at the start of washing in accordance with the type of fiber of the object to be washed, the output from the dewatering operation is performed at high speed or low speed. The centrifugal force suitable for is obtained, and the cloth is not damaged.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an operation control mechanism used in the dewatering operation method of the washing machine according to the present invention. Since the entire structure of the washing machine used in the method according to the present invention is the same as that already described with reference to the vertical side view of FIG. The detailed description is omitted here.

In the figure, 20 is a control device using a microcomputer or the like which is the center of the operation control mechanism, 21 is a frequency converter, 2
2 indicates an AC clock circuit, and the AC clock circuit 22
Is composed of a transformer 22a whose primary winding side is connected to a power source, resistors 22b and 22e which are connected to the secondary winding side of the transformer 22a, a diode 22c, and a transistor 22d. Reference numeral 23 is an operation unit for setting the rotation speed and rotation time of the dehydration tub 4.

In this way, the output signals from the operating section 23 and the AC clock circuit 22 were introduced into the control device 20, and the signal from the control device 20 was introduced into the motor 8 via the frequency converter 21.

Next, a method of controlling the dehydration operation by such an operation control mechanism will be described. When starting washing, first, the operating unit 23 is used to set the rotation speed and time of the dehydration suitable for the material to be washed, for example, normal operation. 90 at high speed
It is set to 300 rotations / minute, which is 1/3 of 0 rotations / minute. Then, in the same manner as in the conventional example, the motor 8 is alternately rotated forward and backward by a timer action of the control device, the agitator 1 is swung to perform a washing operation, and then drainage is performed and a dehydration step is performed.

In the dehydration process, the spring clutch mechanism 13 is switched, the shafts 12b and 12a rotate, and the motor 8 rotates in one direction. Along with that, the dehydration tank 4 rotates via the pulleys 9 and 11, the V-belt 10 and the rotation transmission unit 12,
A centrifugal force is applied to the object to be washed in the dehydration tank 4, and the action causes the object to be washed to be dehydrated.

In the present invention, in the dehydrating step, the number of rotations of the dehydrating tank 4 set by the operating portion 23 is 300.
The rotation / minute is input to the control device 20, but on the other hand, A
In the C clock circuit 22, an input having the same phase as the power supply frequency applied to the motor 8 from the power supply is given to the transformer 22a.

This input is stepped down by the transformer 22a, half-wave clamped by the diode 22c, the resistor 22b limits the current flowing into the transistor 22d, and the transistor 22d and the resistor 22e limit the sine half-wave rectangular shape suitable for the input of the control device 20. Shaped into waves. The shaped rectangular wave is input as a clock signal from the AC clock circuit 22 to the control device 20.

The control device 20 receives both inputs and outputs a control signal to the frequency converter 21. In the frequency converter 21, only the shaded portion of the power source frequency is applied to the motor 8 as shown in the waveform diagram of FIG. Apply to. The frequency of the shaded portion is 1/3 of the fundamental frequency 50 / 60HZ, and as a result, the rotation speed of the motor 8 which is an induction motor also becomes 1/3 rotation speed, and the rotation speed of the dehydration tank 4 Is also a normal high-speed rotation 1
It becomes a low speed rotation of / 3. Thus, the object to be washed in the dehydration tank 4 is dehydrated by the low speed rotation.

In the above embodiment, the number of rotations of the dehydration tank 4 is usually 1/3 for high speed rotation. However, the number of rotations is not limited to this and may be 1/2 or less for high speed rotation. Of course, if there is, it can be implemented. As for the delicate fiber such as wool, the result of the experiment is 1/3 ~
It has been found that a rotation speed of about ½ (300 to 450 rotations / minute) is desirable.

Further, by adding the rotation speed detecting means 14 for detecting the rotation speed of the motor 8 to the above embodiment, there is an effect that the torque at the time of starting the motor 8 can be effectively utilized.

Although the above embodiments have been described by taking a fully automatic stirring type as an example, the method of the present invention can be applied to all types of washing machines having a dehydration tank, such as a two tank type and a pulsator type (spiral type). It can be applied to.

[0027]

As described above, the dewatering operation method of the washing machine according to the present invention is not limited to the normal high speed rotation, and is 1/3 to 1 /
Since it is possible to rotate at a low speed of 2 rotations, it is possible to obtain a rotation speed according to the material to be washed, that is, a centrifugal force,
For example, even a delicate fiber product such as wool can be satisfactorily dehydrated without causing cloth wrapping, loss of shape or wrinkles.

Also, as for the circuit configuration, since a voltage of the power supply frequency applied to the motor is input, the main component is an AC clock circuit that waveform-shapes this and outputs a clock signal. Unlike, it is simple and inexpensive, and does not use an expensive special motor that can switch the number of poles.

[Brief description of drawings]

FIG. 1 is a block diagram of an operation control mechanism used in a dewatering operation method for a washing machine according to the method of the present invention.

FIG. 2 is a waveform diagram of waves converted by a frequency converter.

FIG. 3 is a vertical sectional side view of a one-tank agitated washing machine.

[Explanation of symbols]

 1 ... Agitator 2 ... Through hole 3 ... Stirring blade 4 ... Dehydration tank 5 ... Through hole 6 ... Balancer 7 ... Water receiving tank 8 ... Motor 9 ... Pulley 10 ... V belt 11 ... Pulley 12 ... Rotation transmission part 12a, 12b ... Drive shaft 13 ... Spring clutch mechanism 14 ... Rotation speed detection means 20 ... Control device 21 ... Frequency converter 22 ... AC clock circuit 22a ... Transformer 22b ... Resistor 22c ... Diode 22d ... Transistor 22e ... Resistor 23 ... Operation part

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[Procedure amendment]

[Submission date] June 15, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013]

In order to achieve the above-mentioned object, the present invention is an AC in which a voltage of a power supply frequency applied to the motor is input to a dehydrating tank motor, which is waveform-shaped to output a clock signal. A clock circuit, a control circuit for inputting a clock signal of the AC clock circuit and an output from the operating unit, and outputting a control signal to a frequency converter, and a specific portion of the power supply frequency based on the control signal from the control circuit circuit. Is connected to a frequency conversion means consisting of a frequency converter for applying the motor to the motor, and the dewatering operation of the motor is performed at either a high speed rotation or a low speed rotation below the high speed rotation by the output from this frequency conversion means. is there.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

[0014]

According to the present invention, the number of low speed rotations of the dehydration tub set by the operating portion is input to the control device.
On the other hand, in the AC clock circuit, the input in phase with the power supply frequency applied from the power supply to the motor is shaped into a sine half-wave rectangular wave that matches the input of the control device, and the control device receives both inputs and outputs it to the frequency converter. In the frequency converter, a specific part of the power supply frequency is applied to the motor. As a result, the rotation speed of the motor, which is an induction motor, also becomes a low rotation speed, and the rotation speed of the dehydration tank also becomes a low rotation speed that is lower than the normal high speed rotation. Thus, the material to be washed in the dehydration tank is dehydrated by the low speed rotation.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0027

[Correction method] Change

[Correction content]

[0027]

As described above, the dewatering operation method of the washing machine according to the present invention enables not only the usual high speed rotation but also the low speed rotation at a rotation speed lower than the high speed rotation, so that it depends on the material to be washed. The number of rotations, that is, the centrifugal force can be obtained, and even delicate fiber products such as wool can be satisfactorily dehydrated without getting stuffed, deformed or wrinkled.

Claims (1)

[Claims] 1. An AC clock circuit for inputting a voltage of a power supply frequency applied to the motor to a dehydration tank motor, waveform-shaping the voltage to output a clock signal, and a clock signal of the AC clock circuit and an operating unit. A control circuit which inputs the output from the control circuit and outputs a control signal to the frequency converter,
A frequency conversion means composed of a frequency converter for applying a specific portion of the power supply frequency to the motor based on a control signal from the control circuit is connected, and the motor is driven at high speed from the start to the end of dehydration by the output from the frequency conversion means. A dehydration operation method for a washing machine, characterized in that the dehydration operation is performed either by rotation or at a low speed rotation of about 1/3 to 1/2 thereof.