JPS62396A - Dehydration control device - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a dehydration control device for fully automatic washing machines, centrifugal dehydrators, and the like.

(Prior art and its problems) Conventionally, for delicate clothes that are concerned about deformation, fabric damage, fabric tangles, wrinkles, etc., software that finishes the dehydration operation in a semi-wrapped state (to the extent that water droplets do not fall from the clothes) has been used. The soft spin is carried out at a high rotational speed from start to finish, and just like in normal strong spin, the clothes are subjected to a very large centrifugal force and pressed against the inner wall of the spin tank until the end. As a result, it was not possible to fully eliminate the loss of shape, damage to the fabric, and wrinkles.

In addition, if the rotation speed is adjusted completely, it is possible to suppress the occurrence of deformation, stiffness, wrinkles, etc., but if dehydration is performed at a low rotation speed from start to finish, the time required for dehydration will be very long. It takes a lot of time and results in wasted time and money.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and by reducing the rotation speed at an appropriate timing during the dehydration operation, the dehydration execution time can be shortened, and the dehydration process can be prevented. It is designed to completely reduce the occurrence of wrinkles, wrinkles, etc.

(Structure of the Invention) The present invention includes a detector that optically detects the liquid discharged by the rotation of a dehydration tank, and a detector that sequentially measures the output of the detector so that the output changes from a negative slope to a positive slope. rotation speed switching means that determines the point at which the dehydration tank changes and completely reduces the rotation speed of the motor for rotating the dehydration tank; and soft dehydration end determination means that determines that the output of the detector has reached a set value and stops the motor. The system is configured to include the following, and achieves the intended purpose.

(Example) Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing a control system of a dehydrator in an embodiment of the present invention. In the figure, l is a water tank, 2 is a dehydration tank, 3 is a companion motor that rotates the dehydration tank 2t, 4 is a drain pipe that pops out from the dehydration tank 2 and drains all the liquid, and 5 is a detection device interposed in the drain pipe 4. It is a vessel. This detector 5 is a combination of a light-emitting element and a light-receiving element, and the optical path between the pixel elements is crossed by all the liquid, so as the amount of liquid increases, the light transmittance, that is, the amount of light received by the light-receiving element, decreases. The output voltage also decreases.

Reference numeral 6 denotes a transmittance determination unit that determines the light transmittance based on the output of the detector 5, and an initial value detection function that measures the output of the detector 5 at the initial stage of dehydration operation and stores the value; A peak value detection function that sequentially measures and determines the point at which the output change changes from a negative slope to a positive slope, measures the output of the detector 5 at this point, and stores the value, based on the initial value and the peak value. It has a reference value setting function that calculates and sets a value at a predetermined restoration rate, and a comparison function that sequentially measures the output of the detector 5 and compares it with the reference value.

Reference numeral 7 designates a motor control unit that fully controls the motor 3, 8 a sequence control unit, and 9 a strong dehydration/soft dehydration selection unit.

FIG. 2 shows data when three plums of Momen cloth were completely dehydrated, and shows the relationship between the output voltage change of the detector 5 and the dehydration rate change at this time. When dehydration starts, the rotation speed of the motor 3 gradually increases, and the liquid discharged from the dehydration tank 2 passes from the water receiving tank 1 through the drain pipe 4 and reaches the detector 5, and the light transmittance of the detector 5 decreases. The output voltage also becomes smaller. Approximately 20 seconds have passed since the start of dehydration, and the light transmittance is at its worst at the point where the output voltage shows the lowest value (peak value).After that, the amount of liquid squeezed out from the cloth decreases, so the light transmittance decreases. (output voltage) gradually recovers and returns to its initial value in about 50 seconds.

On the other hand, the dehydration rate changes as shown in FIG. 2, and changes from a rapid change to a slow change after about 35 seconds from the start of dehydration. Additionally, experiments have shown that in order to actually wring out the cloth, a certain amount of time (for example, 4 minutes) t is required in addition to the time from the start of dehydration to the point at which the change in dehydration rate changes from rapid to slow. It is required by

Now, in Fig. 2, if we look at the point at which the dehydration rate changes from rapid to slow (35 seconds point), the output voltage is v3,
This V3 restores the initial value V1 with a recovery rate of 100X and the lowest value (
If the peak value) v27 is also set to 0%, the restoration rate will be reduced to a value of 80%. Therefore, the initial value V and the peak value V2 are all detected, and based on these, a value V3 with a recovery rate of 80% is calculated, and the time t from the start of dehydration until the output voltage of the detector 5 reaches v3.
By counting, it is possible to determine the completion time of dehydration in strong dehydration based on the time.

Furthermore, the fact that the dehydration rate changes from rapid to slow is a result of the so-called semi-dehydration state in which water droplets do not fall even when taken out from the paid dehydration tank. Therefore, the time when the output voltage of the detector 5 reaches v3 may be determined as the dehydration completion time in the KeSoft dehydration. In this soft dehydration, by reducing the rotation speed of the motor 3 when the output voltage of the detector 5 reaches V2, the clothes lose their shape, become loose, and wrinkle, etc., as described later. Alleviate the occurrence of wasted time? Omitted. Incidentally, the dehydration rate is determined by the following formula.

However, the weight of the cloth is the weight of the naturally dried cloth.

First, the flowchart in Figure 3 regarding control during strong dehydration)
Let's explain based on k.

In FIG. 8, when dehydration starts, the motor 3 is turned on, and at the same time, the permeability determination section 6 measures the output voltage v2 of the detector 5 at the initial stage of the dehydration operation (0 seconds), and determines the value? Initial value v
Store as I. On the other hand, the timer in the sequence control section 8 is started and counts the entire elapsed time from the start of dehydration.

Thereafter, the transmittance determining unit 6 measures the output voltage v of the detector 5 one by one and determines the point at which the change changes from a negative slope to a positive slope. That is, it is determined that the output voltage measurement value of the detector 5 is the same as or higher than the previous measurement value, and is stored as the output voltage Vt at this time - the peak value V2. Then, the reference value V3 total, V3 = V2 + (V, -V2)
The comparison with 3 will be repeated, and eventually the relationship of V>V3 will be reached, and the timer data T at this time? Loading T
1, and by adding a predetermined time (for example, 4 minutes) to this T, the dehydration completion time T2t' is calculated. and,
When the timer data T becomes T≧T2, the motor 3 is stopped, the timer is completely stopped, and the timer data is cleared to complete the strong dewatering operation.

Next, what is the flowchart in Figure 4 regarding the control during soft dehydration? I will explain based on this. Standard value V3 from the start of soft dehydration
The calculations up to are performed in the same way as in the case of strong dehydration.

Then, when it is determined that the output change of the detector 5 has changed from a negative slope to a positive slope, the peak value v2 is read,
At the same time as calculating the reference value v3, the rotation speed of the motor 3 is changed from the total steady rotation speed (for example, 9oorpm) to 45, for example.
Reduce the speed to 0 rpm and continue the dewatering operation at a low rotation speed.

This dehydration operation at low rotational speed continues until the output voltage V of the detector 5 reaches V2V5, and when the relationship ■≧v3 is reached, the motor 3 is stopped, all timers are stopped, and the timer data is cleared, and the ranft dehydration operation is started. It ends with.

Normally, when clothes contain a large amount of water, they are less likely to lose their shape or wrinkle, but when the water content decreases, they are more likely to lose their shape or wrinkle. Dehydration is performed at a steady rotation speed, and then the rotation speed is reduced to completely reduce deformation, fabric damage, and wrinkles.In addition, the time required for dehydration is minimized. In the present invention, the recovery rate is not limited to the values in the above embodiments, but is determined as appropriate depending on the performance of the dehydrator, the structure of the detector, etc.

(Effects of the Invention) As described above, the present invention can completely reduce the occurrence of deformation, looseness, wrinkles, etc. by soft dehydration, and can also suppress the dehydration execution time to a short time, which is excellent in practical use. It is.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the control system of the dehydrator according to the embodiment of the present invention, Fig. 2 is a diagram showing the relationship between the output voltage of the above detector and the dehydration rate, and Figs. 3 and 4 are the same as above. It is a control flowchart at the time of dehydration and soft dehydration. 5: Detector, 6: Transparency judgment unit 0 Agent Patent attorney Aihiko Fukushi (and 2 others)'7 Figure 1 Figure 2

Claims (1)

[Claims] 1. A detector that optically detects the liquid discharged by the rotation of the dehydration tank, and the output of the detector is sequentially measured to determine the point at which the output change changes from a negative slope to a positive slope. Dehydration control comprising a rotation speed switching means for reducing the rotation speed of a motor for rotating the aquarium, and a soft dehydration end determination means for determining that the output of the detector has reached a set value and stopping the motor. Device.