JPS62114596A - Electric washing machine - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application: Industry - 2 The present invention relates to an electric washing machine that supplies water to an optimum water level depending on the amount of laundry.

2. Description of the Related Art Conventionally, this type of electric washing machine has had a groove structure as shown in FIG. 3 is a drive device, which has a motor for rotating the washing tub 1 and the stirring blade 2, a control device for controlling the opening and closing of the drain valve 8, and a switching mechanism for washing and spin-drying.
The stirring blade 2 is rotated during washing, and the washing tub 1 is rotated during dewatering.
, and open the drain valve 8 when draining water. 4 is a cloth amount detection device which detects the magnitude of the load applied to the drive device 3 with respect to the amount of water and cloth in the washing tub 1 and determines the amount of cloth.

A water level detection device 5 detects the water level in the washing tub 1. 7
is a water level determination device which compares the detection result output of the cloth amount detection device 4 with the water level data output from the water level detection device 5, determines the required water level for the amount of cloth, and outputs a signal to the water supply device 6. The water level detection device 5 consists of a pressure sensor that measures the pressure generated by the water level and uses it as the water level. The water level determination device 7 continues to feed water until the water level reaches a predetermined water level for detecting the amount of cloth (step (a)). 4 is output to the Iψ drive device to start stirring (step (b)). 1 The magnitude of the load on the drive device 3 is detected as a human signal by the cloth amount detection device +i4, and the amount of cloth is determined (step (c)).The result is output to the water supply device 6 through the water level determination device 7, and the amount of cloth is determined. Water is supplied to the appropriate water level (that is, if the amount of fabric is small, the water level is low, and if the amount is large, the water level is high) (step (d)). Water supply ends, and the drive device 3 starts washing. When washing is completed, the drive device 3 opens the drain valve 8 to drain water.

After draining, the drive device 3 rotates the washing tub 1 and dewatering is performed for a certain period of time regardless of the amount of cloth in the washing tub 1 (hereinafter referred to as intermediate dehydration). Thereafter, water is supplied in the same manner as described above up to the water level determined by the water level determination device 7, and after the water supply, the stirring blade 2 is rotated to perform rinsing and stirring.

After that, a series of steps such as drainage, intermediate dehydration, rinsing and stirring is performed once or twice to complete the so-called rinsing step, and finally, drainage is performed in the same manner as above, and then dehydration is performed (final dehydration). A series of washing, rinsing, and spin-drying steps is completed. The table below shows an example of this series of steps.

(The following is a blank space) Problems to be Solved by the Invention In such a conventional configuration, intermediate dehydration is performed for the same amount of time regardless of whether the determination result of the cloth amount detection device 4 is a small amount or a large amount.

In general, intermediate dehydration is the previous step of washing or
This is done to improve the rinsing efficiency by squeezing out the washing liquid or rinsing liquid from the cloth during the rinsing agitation process and diluting the amount of remaining detergent in the next rinsing agitation process to reduce the amount of detergent adhering to the cloth. Therefore, if there is a large amount of detergent remaining on the cloth immediately after intermediate dehydration, the rinsing efficiency will be poor and the cloth will not be rinsed thoroughly. Naturally, if the cloth is sufficiently squeezed during intermediate dehydration, the amount of remaining detergent will be reduced. What is the aperture rate?

, and the larger the value, the better the squeezing, but as shown in Figure 4, this means that for the same washing M tank, the same spin-drying rotation speed, and the same cloth weight, The longer the dehydration time, the higher the reduction rate.

However, after a certain period of time, the squeezing rate does not improve because the cohesive force between the water and the cloth is large. Therefore, even if the intermediate dehydration time is made longer than necessary, the amount of residual detergent will hardly be reduced, and the rinsing efficiency will not be improved. However, the longer the intermediate dehydration time, the more likely the cloth will wrinkle due to centrifugal force, the more easily the cloth will be damaged, and the thinner the clothing, the more it will lose its shape.

Furthermore, if the intermediate dehydration time is long, the entire washing process from washing to final dehydration will take a long time, making it inconvenient to use. As mentioned above, the intermediate dehydration time is unsuitable if it is too long or too short, and generally it is desirable that the dehydration time be such that the reduction ratio is 50 to 55%.

On the other hand, as shown in FIG. 5, the squeezing rate varies depending on the amount of cloth, and the time it takes to reach the same squeezing rate is faster when the amount of cloth is smaller. This is because the water contained in the cloth is squeezed out by centrifugal force, and if there is a large amount of cloth, the water squeezed out from the cloth near the center of rotation will be squeezed out before being drained out of the rotating washing tub. This is because it is easily absorbed by a large amount of cloth located outside the cloth.

By the way, in the past, the intermediate dehydration time was constant regardless of the amount of cloth, so when a large amount of cloth is used, the intermediate dehydration time is short and rinsing tends to be insufficient.On the other hand, when a small amount of cloth is used, it is difficult to rinse thoroughly. However, there were problems with the fabric having many wrinkles, causing the fabric to lose its shape, and the overall washing process taking longer.

The object of the present invention is to provide an easy-to-use electric washing machine i+J that prevents insufficient rinsing, wrinkles and deformation of cloth, and has no unreasonable parts during the entire washing process.

Means for Solving the Problems The electric washing machine of the present invention includes a drive device that rotates stirring blades in the washing tub during washing and rotates the washing tub during dehydration, and a drive device that rotates the stirring blades when rotating the stirring blades. A cloth amount detection device that determines the amount of cloth in the washing tub based on the magnitude of the load applied to the washing tub, and a cloth amount detection device that determines the amount of cloth in the washing tub based on the magnitude of the load applied to the washing tank, and a cloth amount detection device that determines the amount of cloth in the washing tub based on the determination result of the cloth amount detection device. 6. Function: According to this configuration, the intermediate spin-drying time is automatically changed depending on the amount of cloth in the washing tub.

EXAMPLE Hereinafter, an example of the present invention will be explained based on FIGS. 1 and 2.

FIG. 1 shows an electric washing machine of the present invention, in which the same parts as in the conventional example shown in FIG. 3 are given the same reference numerals, and in FIG. is different. FIG. 2 is an electrical circuit diagram of the present invention.

The cloth amount detection device 4 includes a current transformer 10 that detects the value of current flowing to the motor 27 in the drive device 3, an A/D converter 11, and a microphone computer 12. Drive bag [
The control device 3 includes a microcomputer 12, a transistor 13.14, a bidirectional thyristor 15.16,
Transistor 17, bidirectional thyristor 18, and solenoid valve 1
Consists of 9. The water level detection device 5 is.

It consists of a pressure sensor 20, an A/D converter 21, and a microcomputer 12, and the water level determination device 7 consists of the microcomputer 12. The intermediate dehydration time determining device 9 consists of a microcomputer 12. The water supply device 6 is the water supply valve 2
2, a transistor 23, and a bidirectional thyristor 24. 25 is an AC power source, 26 is a DC power source, 27 is a motor, 28 is an outer tank, and 8 is a drain valve, which is opened and closed by a solenoid valve 19.

The operation in the above configuration will be explained.

After starting washing, the predetermined water level necessary to determine the amount of cloth (for example, the water level is a small amount, a low water level, a medium water level.

The pressure sensor 20 reads the water level data as an electrical signal until it reaches a high water level and a small water level in 4 stages.
The converter 21 inputs digital data from the input terminal A, and while the microcomputer 12 measures the current water level, that is, the water level detection device 5 measures the water level (step (a)). In step (a)), in order to output a high level signal from the output terminal E of the microcomputer 12, the water supply device 6, that is, the transistor 23 is driven, the thyristor 24 is ignited, and the water supply valve 2 is activated.
Open 2 and continue supplying water. When the water reaches a predetermined level (small water level), water supply is stopped (step (b)). Next, the drive device 3 operates, outputting high-level output signals alternately from the output terminals C and D of the microcomputer 12, and outputting signals from the transistors 13.
14, the bidirectional thyristors 15 and 16 are fired, the motor 27 is rotated left and right, and the stirring blade 2 is rotated in reverse. The magnitude of the load caused by the stirring is detected by the cloth amount detection device 4 as the magnitude of the current flowing through the motor 27 using the current 1-lance lO.

The electric signal from the current transformer 10 is sent to the A/D converter 1
1, the data is converted into digital data, is input to the microcomputer 12 from input terminal B, and the amount of cloth is determined (step (c)). Based on the cloth amount judgment result, the water level determination device 7 determines the optimum water level according to the cloth amount, and outputs a high level signal from the output terminal E of the microcomputer 12 (step (d)), drives the transistor 23, and drives the thyristor. 2
4 and open the water supply valve 22 to continue water supply. Water supply continues in the same manner as described above until the water level detection device 7 detects the optimum water level. This completes the water supply to the optimum water level according to the amount of cloth.

Next, during a predetermined washing time, output signals are sent to the output terminals C and D of the microcomputer 12 to rotate the motor 27 left and right to rotate the stirring blades 2 in reverse, as described above, to perform the washing process (step (e)).

When the washing process is completed, the electromagnetic valve 19 of the control device of the j-drive device 3 is activated, and the drain valve 8 is opened to drain water (drain process). That is, a high level output signal is output from the output terminal F, the transistor 17 is turned on, the thyristor 18 is fired, the solenoid valve 19 is energized, and the drain valve 8 is opened. After the drainage is completed, an intermediate dehydration process is performed.

The intermediate dehydration time is determined by the intermediate dehydration time determination device 9 in accordance with the determination result of the cloth amount detection device 4, and is outputted to the drive device 3 (step (step)). In other words, a high-level output signal is output to the output terminal C for a period of time corresponding to the cloth amount determination result, the transistor 13 is driven, the thyristor 15 is fired, the motor 27 is rotated in one direction, and the washing is started. Rotate tank 1 for dehydration. However, during this time, the solenoid valve 19 is operated continuously from the drain stroke, and although it will not be described in detail here, the operation of the solenoid valve 19 switches the drive device 3 from washing to dewatering.

That is, if the determination result of the amount of cloth is "a large amount", a high-level output signal is output to the output terminal C for a long time, and if the determination result is a "small amount", an output signal is output for a shorter time than if it is a "large amount". For example, change the amount of cloth from 3kg to 2kg.
is a “large amount”, 2kg to 1kg is a “slightly large amount”, 1kg to
0.5kg is "medium amount", 0.5kg or more is "small amount"
If it is determined to be a large amount, it will be judged in 4 stages.
Intermediate dehydration time determination bag ■9. In other words, the microcomputer 12
A high-level signal is output from the output terminal C for the determined time period, and the washing tub 1 is rotated to perform spin-drying. After that, the output signal from the output terminal C is stopped, the energization of the solenoid valve 19 is stopped, the drain valve 8 is closed, an output signal is sent to the output terminal E in the same way as above, water is supplied again, and the washing process starts after water supply. Similarly, the stirring blade 2 is rotated to perform a rinsing stirring process. The above-mentioned draining process, intermediate dehydrating process, and rinsing process are repeated once or twice, and finally, the draining process is performed again, and output signals are output to the output terminals F and C for a predetermined final dehydrating time to perform dehydration and wash. A series of steps up to the final dehydration are completed.

Effects of the Invention As described above, the electric washing machine of the present invention can automatically perform intermediate dehydration with an appropriate intermediate dehydration time depending on the amount of cloth. Improves the squeezing rate during dehydration.

Improves rinsing performance. If the amount of cloth is small, intermediate dehydration can be performed for a relatively short time to prevent wrinkles and deformation due to excessive wringing, and the total washing process time can be shortened without deteriorating rinsing performance. For example, if the intermediate dehydration process is performed twice during the rinsing process, in this example, 0
．． When washing 5 kg of cloth, it takes 5 minutes less than when washing 3 kg of cloth, and the normal total washing time is 40 to 35 minutes.
It takes about a minute.

1 compared to the conventional 3k and 1kg in the same time.
This makes it possible to achieve a time reduction of over 0%.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of an embodiment of the electric washing machine of the present invention;
The figure is the electric circuit diagram of Figure 1, Figure 3 is the configuration diagram of a conventional electric washing machine, Figure 4 is the relationship between dehydration time and shrinkage rate, and Figure 5 is the amount of cloth and the time until 50% wringing rate is reached. FIG. 1. Washing tub, 2.-Agitation blade, 3. Drive device, 4.
...Water amount detection device, 5.Water level detection device, 6.Water supply device, 7.Water level determination device, 8..Drain valve, 9..Intermediate dewatering time determination device representative Yoshihiro Morimoto @1 Figure 2 Figure 3

Claims (1)

[Claims] 1. The amount of cloth in the washing tub is determined from the drive device that rotates the stirring blades in the washing tub during washing and the washing tub during spin-drying, and the magnitude of the load applied to the driving device when rotating the stirring blades. and an intermediate spin-drying time determining device that determines an intermediate spin-drying time in the middle of a series of processes from washing to final spin-drying according to a determination result of the clothes weight detecting device and outputs it to the drive device. Electric washing machine equipped with