JP2900727B2 - Dehydration control method for fully automatic washing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the operation of a fully automatic washing machine during spin-drying.

[0002]

2. Description of the Related Art Conventionally, intermediate dehydration performed in the process from the start of washing of a washing machine to final dehydration is performed by intermittent dehydration in which a motor for rotating a washing and dehydrating tub is repeatedly operated or stopped. Was.

[0003] In the intermittent dehydration performed after washing the laundry,
When the rotation of the washing and dewatering tub is increased by repeatedly starting and stopping the motor due to intermittent dehydration because the laundry contains detergent, if the rotation speed is suddenly increased, the washing and dehydration are performed. There is a problem that water that is not drained between the tub and the outer tub and foaming due to detergent in the laundry occur, and that the rotation speed of the washing and dewatering tub does not increase due to the resistance of the foam. Therefore, as in the invention described in Japanese Patent Application Laid-Open No. 3-158188, the problem due to foaming is prevented by setting the dehydration time to be different between the first half and the second half of the dehydration operation.

[0004]

However, if intermittent dehydration after rinsing is performed in the same manner as intermittent dehydration after washing, there is a problem that it takes a long time to reach a desired dehydration rotation speed. That is, there has been a problem that the acceleration characteristics of intermittent dehydration are deteriorated.

[0005] An object of the present invention is to prevent intermittent dehydration after washing and dehydration after rinsing to prevent foaming damage due to detergent in dehydration after washing and to improve dehydration acceleration characteristics in dehydration after rinsing. is there.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an outer frame, a washing and dewatering tub placed inside the outer frame for performing washing, rinsing, and the like, a motor for rotating the washing and dewatering tub, It has a control means for controlling intermittent dehydration in which the number of revolutions of the washing and dewatering tub is increased stepwise by repeating operation and suspension, and the control means performs intermittent dehydration after washing and intermittent dehydration after rinsing. In the method for controlling dehydration of an automatic washing machine, the relationship between the rinsing pause time of the motor in the intermittent time period of the intermittent dehydration after the rinsing and the washing pause time of the motor in the intermittent time period of the intermittent dehydration after the rinsing is represented by a rinsing pause time < It is characterized by a washing pause time.

[0007]

By reducing the motor pause time during intermittent spin-drying after rinsing as compared to the motor pause time during intermittent spin-drying after washing, foaming troubles that may occur during spin-drying after washing can be prevented, and the motor can be operated at a predetermined rotational speed. The time required for the spinning, that is, the acceleration characteristics of the spinning rotation is improved, and the spinning time can be reduced.

That is, in the dehydration after rinsing, the amount of detergent contained in the clothes in the washing and dewatering tub is mostly washed off by the rinsing after washing, so that the amount of the detergent between the washing and dewatering tub and the outer tub is reduced. Since there is no need to consider the foaming disorder in which the detergent foams due to the water remaining without being drained, the downtime of the motor in the intermittent period of intermittent dehydration after rinsing is shorter than the downtime of the motor in the intermittent period of intermittent dehydration after washing. By shortening, the acceleration characteristic of intermittent dehydration after rinsing can be made higher than the acceleration characteristic of intermittent dehydration after washing, and the dehydration time can be shortened.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG.
It is a longitudinal section of the fully automatic washing machine which carried out the present invention, and when explaining operation | movement one by one, the fully automatic washing machine is inside the outer frame 1,
The outer tub 2 is supported by the four hanging rods 5 from the corner plates 21 at the upper four corners of the outer frame 1.

The hanging rod 5 has a helical spring 4 for absorbing vibration during washing and spin-drying.

In the case of washing, the lid 18 is opened, clothes are put into the washing tub 3, and water is supplied according to a command from the control unit 19, and then the motor 20 is rotated forward and backward.

The rotation of the motor 20 is transmitted from the motor pulley 17 to the clutch pulley 15 in the clutch 14 via the V-belt 16.

The transmitted rotation is transmitted by the clutch 14
At the time of washing, the agitation blade 7 for moving the clothes located at the center of the washing tub 3 is rotated to wash.

At the time of drainage, the motor 2
0 is stopped, the drain valve 12 is opened, and the washing liquid in the washing tub 3 is discharged from the drain hose 13 to the outside of the machine.

After draining, the process proceeds to a dehydration process.
Since the outer tub 2 shakes greatly depending on the state of the clothes, a balancer 6 is provided above the washing tub 3 to prevent the outer tub 2 from shaking due to dehydration.

In the dehydration, the rotation of the motor 20 is transmitted to the clutch 14 via the V-belt 16 in the same manner as in the washing, and the washing tub 3 is rotated at a high speed under the control of the clutch 14, and the centrifugal force is applied. The water in the clothes is dehydrated to the outer tub 2.

The dewatered washing water is drained out of the machine from a drain hose 13 by operating a drain valve 12.

FIG. 2 is a detailed explanatory diagram of the control unit 19 described in FIG.

Timer 33 and central processing unit (CPU) 3
2 and the electronic control circuit 34 comprising the memory 31 and the I / O ports 29 and 30 sequentially shift from washing to dehydration in the same manner as in the case of the control by the timer comprising the timer motor and the cam switch.

Hereinafter, embodiments will be described with reference to block diagrams.

The electronic control circuit 34 shown in FIG. 2 is for automatically shifting the process from the washing process by washing to the final dehydration process. Basically, as is well known, the timer 33 and the central processing unit are used. Device (CPU) 32, memory 3
1, an input port 29 and an output port 30.

The control command at the time of washing is issued by the central processing unit 32. The central processing unit 32 has an arithmetic unit and a control unit and is the center of the system.

Basically, instructions are fetched, decoded, and executed. Specifically, arithmetic and logical operations, reading and writing of the contents of a specified address of a memory, and input / output of a specified address to an input / output device are specified. It controls output control and program flow.

The memory 31 stores programs and data, and has both read and write functions.
And a ROM having only a read function. R
The AM is used as a work area for storing data and assembling a program, and the ROM is used to store a fixed program or fixed data and perform the same processing at any time.

The input port 29 and the output port 30 are connected to the CP
A circuit that mediates when data is transferred between U and an input device and an output device, and is generally called an I / O port.

An electric command from a fully automatic washing machine is input to the input side of the I / O port.

Mainly, power switch 23, water level sensor 2
2, a lid switch 24, a program selection switch 25, a start / stop switch 26, and the like.

The output side is connected to a washing machine motor 20, a water supply valve 10, a drain valve 12, a clutch solenoid 27, an alarm 28, and the like, and via an I / O port in response to a command from the central processing unit 32. And performs a series of washing operations.

Therefore, the washing machine has a timer motor and
Control is performed by a timer including a cam switch in the same manner as in a washing machine with a timer in which control is performed. The washing machine is controlled by the electronic circuit as described above.

FIG. 3 is a block diagram of the washing process in the fully automatic washing machine, and the process proceeds from left to right in the figure.

Referring to the block diagram of FIG. 3, the washing process of the fully automatic washing machine will be described in more detail with reference to FIGS. 1 and 2 and the operation panel FIG. By pressing, an arbitrary washing course is set by the program selection switch 25 and the start / stop switch 26 is pressed, the water supply 52 in FIG. 3 is entered.

Water is automatically supplied from the water supply hose 11 to the washing tub 3 as washing water until the water reaches a predetermined water level.

When the specified water level is reached, the water level sensor 2
When notified to the central processing unit 32 by 2, the washing is started. After the washing is performed for a certain period of time, the drain valve 12 is opened, and the washing water in the outer tub 2 is drained out of the washing machine from the drain hose 13.

After it is detected by the water level sensor 22 that the washing water has been completely drained, the process proceeds to the first intermediate dehydration 53 and the washing tub 3 is rotated at a high speed, whereby the washing water containing the detergent in the clothes is removed. Dehydrate by centrifugal force.

After the completion of dehydration, in order to perform the first rinsing 54, water is supplied under the same control as for washing, and rinsing is started after reaching a specified amount of water. After the rinsing 54 is completed, drainage is performed, and a second intermediate dehydration 55 is performed.

Next, water supply / rinsing is performed to perform the second rinsing 57. After the end of the second rinsing 57, the water is drained to perform the final dehydration 56, and all the steps are completed.

FIG. 5 is a diagram showing a state set on the operation panel of FIG. 4 on a large liquid crystal display panel. Hereinafter, an example in which the liquid crystal display panel is configured as a large liquid crystal display panel (LCD) will be described.

The LCD displays a washing course 46, a washing water level 47, a washing time display 48, and a rinsing frequency display 4.
9, display 51 of dehydration time, display of current time 50, and the like. These display functions will be described with reference to the operation panel diagram of FIG. 4. When the triangular arrow portion of the program selection key 25 of FIG. 4 is pressed, the washing course displayed on the washing course 46 of the LCD of FIG. Is represented by a triangle arrow.

When the program selection key shown in FIG. 4 is continuously pressed, the display of the washing course 46 shown in FIG. 5 automatically changes, and a necessary washing course 46 can be set.

Next, every time the water level switch 35 in FIG. 4 is pressed, the water level setting display displayed on the LCD in FIG. 5 is indicated by a triangle arrow mark, and the washing water level can be set arbitrarily and washing can be performed. .

FIG. 6 shows the first intermediate dehydration 5 shown in FIG.
FIG. 3 is a diagram showing the relation between the intermittent dehydration 58 and the continuous dehydration 57 showing the relationship between the dehydration acceleration rotation speed at the second intermediate dehydration 55 and the final dehydration 56 and the dehydration time.

In FIG. 6, the control method of the continuous dehydration 57 is as follows. When the washing tub 3 is rotated at a high speed after draining the washing liquid and the rinsing liquid after the washing, the operation of the motor 20 is started from the start of the dehydrating operation. Is operated continuously until the dehydration for a specified time is completed.

When the continuous dehydration shown in FIG. 6 is performed in the first intermediate dehydration 53 after the washing, the water containing the detergent in the clothes is rapidly dehydrated from the clothes to the outer tub 2 through the dehydration holes 3A of the washing tub 3. You.

The dehydrated water is discharged from the drainage hose 13 through the drainage valve 12 to the outside of the machine. The amount of water dewatered from the clothes and the amount of water discharged from the drainage hose 13 to the outside of the machine are determined. In relation, the amount of water that is dehydrated in a shorter time than in the clothes is larger, the dehydrated water remains between the washing tub 3 and the outer tub 2, and the remaining water is stirred by the dehydration. Foaming between the outer tubs 2
There is a disadvantage that the rotation of the washing tub 3 does not increase and the water in the clothes cannot be dehydrated.

In order to prevent this disadvantage, the first type shown in FIG.
The second intermediate dehydration 53 and the second intermediate dehydration 55 are shown in FIG.
The control of the intermittent dehydration 58 shown in FIG.

The intermittent dehydration 58 is controlled during the dehydration process.
By operating the motor 20 intermittently, the rotation of the washing tub 3 is not rapidly increased as in the case of the continuous dehydration 57,
The amount of water dehydrated to dewater the clothes in the outer tub 2 from the dehydration hole 3A of the washing tub 3 gradually and the drain hose 1
The balance of the amount of water drained from the machine 3 to the outside is balanced so that no dewatered water remains between the washing tub 3 and the outer tub 2 during dewatering.

By controlling the dehydration of the intermittent dehydration 58 as described above, it is possible to prevent the foaming trouble occurring during the dehydration.

However, if the second intermittent dehydration after rinsing is performed in the same manner as the first intermittent dehydration after washing, there is a problem that it takes a long time to reach a desired spin rate. That is, there has been a problem that the acceleration characteristics of intermittent dehydration are deteriorated.

According to the present invention, the conventional disadvantage can be eliminated by employing the intermediate intermittent dewatering method shown in FIG. The intermittent dehydration control method of the present invention will be described with reference to FIG.

The intermittent dehydration 59 in FIG. 7 is an intermittent dehydration control method performed in the process of the intermediate dehydration 53 after the end of the washing shown in FIG. Since the problem that occurs in the intermediate dehydration 53 is dehydration after washing, a large amount of detergent is contained in the water in the clothes.

For this reason, if the dehydration is accelerated rapidly in the intermediate dehydration 53, the above-mentioned problem occurs. Therefore, as shown in FIG. 7, the dehydration is divided into three regions, ie, the initial, intermediate and final stages. The ON duty at the time of intermittent operation of the motor is large,
Operate continuously at the end.

In the region of the intermittent 1, in order to improve the dehydration acceleration characteristics, the motor idle time is shortened and the motor operation time is increased, that is, the so-called motor ON duty is increased. At the start of the intermittent dewatering, the rotation of the washing tub 3 is low, so that the amount of water dewatered from inside the clothes is also small, and does not exceed the amount of water discharged from the drain hose 13.

In the process of the intermittent 2, the rotation of the washing tub 3 is increased and the centrifugal force is also increased, so that the moisture of the clothing is gradually dehydrated. The washing tub 3 is removed while dewatering to such an extent that the water does not exceed the amount drained from the drain hose 13.
To accelerate the operation, and finally to a continuous operation to dehydrate the clothes.

As described above, the intermittent dehydration 59 shown in FIG. 7 is a dehydration control method in which foaming failure due to the dehydration operation is prevented and acceleration characteristics are improved.

A second operation performed after the first rinse 54 in FIG.
In the first intermediate dehydration 55, since the detergent in the clothes has already been dropped by the first rinse 54, the foaming during dehydration should be taken into account much like the intermittent time period performed in the first intermediate dehydration 53. Therefore, the intermittent period is controlled differently from the intermediate dehydration 53 after washing, and the intermittent dehydration is performed with emphasis on acceleration characteristics.

However, at this time, since the clothes still contain the detergent, the continuous dehydration 57 shown in FIG.
With such a control, there is a risk that a foaming failure may occur.

However, the danger of foaming is lower than that of the first intermediate dehydration 53, so that the period of the intermittent 1 in FIG.
In the time period of the intermittent 2, the intermittent dehydration 60 is controlled such that the pause of the motor 20 is shortened from the intermittent dehydration 59.

In each of the intermittent and intermittent areas,
Changing the ratio between the motor operation time and the pause time can be easily realized by preparing such a program in the control unit 34 in advance.

Further, it can be realized by a timer cam. What is necessary is just to prepare two types of cam switches having different ON-OFF cycles, and selectively use them.

Further, in the case where the CPU is provided as in this embodiment, the ON duty of the motor is large in the initial stage of starting, the ON duty is reduced with the passage of time, and the motor is turned on again.
The duty may be increased, and the duty may be changed continuously so that the ON duty becomes 100% near the end of dehydration, that is, continuous operation.

However, in any case, in the initial stage of starting the motor, the acceleration is set so as to quickly pass the resonance point of the vibration system such as the washing tub and the outer tub suspended by the hanging rod. It is necessary to select the ON duty of the motor.

As described above, in the intermediate dehydration during the washing course, the intermittent dehydration 59 of the first intermediate dehydration 53 performed after the washing and the intermittent time of the second intermediate dehydration 55 performed after the rinsing are made different from each other. As shown in FIG. 7, the intermittent time period in the intermittent dehydration is divided into intermittent 1 and intermittent 2 and different from each other.

[0063]

According to the present invention, the motor idle time after intermittent dehydration after rinsing is reduced compared to the motor idle time during intermittent dehydration after washing, thereby improving the acceleration characteristics of the spinning of the washing tub by the motor and shortening the dehydrating time. it can.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a fully automatic washing machine.

FIG. 2 is a block diagram of a control unit.

FIG. 3 is a block diagram of a fully automatic washing course.

FIG. 4 is an explanatory diagram of an operation panel.

FIG. 5 is an explanatory diagram of a process display.

FIG. 6 is an experimental result by a conventional dehydration control.

FIG. 7 shows an experimental result by the dehydration control of the present invention.

[Explanation of symbols]

3: washing tub, 7: stirring blade, 19: control unit, 20: washing machine motor, 59: first intermediate dehydration, 60: second intermediate dehydration.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-127792 (JP, A) JP-A-57-34893 (JP, A) JP-A-62-148692 (JP, A) JP-A-3-3 158188 (JP, A) JP-A-63-296794 (JP, A) JP-A-62-164493 (JP, A) JP-A-5-103894 (JP, A) JP-A-5-253384 (JP, A) JP-A-2-92394 (JP, A) JP-A-62-299290 (JP, A) JP-A-51-45867 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) D06F 33 / 02,39 / 06

Claims (1)

(57) [Claims] 1. An outer frame, a washing and dewatering tub placed inside the outer frame for washing, rinsing, etc., a motor for rotating the washing and dewatering tub, and the motor being repeatedly operated and stopped by the motor. A dehydration control method for a fully automatic washing machine that performs intermittent dehydration after washing, and intermittent dehydration after rinsing, the control unit having intermittent dehydration that gradually increases the number of revolutions of the washing and dehydrating tub. The relationship between the rinsing pause time of the motor in the intermittent time period of the intermittent dehydration after the rinsing and the washing pause time of the motor in the intermittent time period of the intermittent dehydration after the washing is defined as rinsing pause time <washing pause time. Dehydration control method for fully automatic washing machine.