JPS61181497A - Control of dehydration - 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 (Technical Field) The present invention relates to a method for controlling dehydration in fully automatic washing machines, centrifugal dehydrators, and the like.

(Prior art) Conventionally, in the case of a system in which the amount of water ejected from a dehydration tank is used as dehydration control data and the dehydration operation is controlled based on this data, for example, the dehydration rate changes from rapid to slow due to changes in the amount of water ejected. The system calculates the time until completion of dehydration based on the elapsed time from the start of dehydration to the above point, and controls the end of the dehydration operation.

By the way, even with such a centrifugal dehydrator, if the dehydration lid is opened during dehydration, the dehydration operation is interrupted for safety reasons, but the control at that time is to first stop the dehydration by opening the dehydration lid. At the same time as stopping the dehydration operation, the dehydration control data until the lid is opened is reset to the initial state, and then the dehydration operation is restarted when the lid is closed, and the end of the dehydration operation is controlled based on the dehydration control data after restarting the next time. This led to insufficient dehydration as described below.

For example, if the dehydration lid is opened once before the point at which the dehydration rate changes from rapid to slow, and then operation is restarted by closing the lid, the time from restarting operation to reaching the above point is short, and based on this time. Since the dehydration completion time is calculated based on the calculation, the dehydration time is shorter than the actual time required to complete the dehydration (approximately three times the elapsed time from the start of dehydration to the above point), resulting in insufficient dehydration. . In addition, if the dehydration lid is opened after the dehydration rate changes from rapid to slow, it is determined that the above point does not occur after restarting operation and there is no signal after a certain period of time, and the predetermined minimum time is determined. The dehydration operation ends at this point, resulting in insufficient dehydration.

(Purpose) The present invention has been made in view of this point, and it is possible to retain dehydration control data from the time of opening the lid to opening the lid without canceling it, and to compare this dehydration control data with the dehydration control data after restarting operation. By controlling the end of the dehydration operation based on the comparison result, insufficient dehydration caused by opening and closing of the dehydration lid is resolved.

(Embodiment) The method of the present invention uses the amount of water that jumps out of the dehydration tank as dehydration control data and controls the dehydration operation based on the data, and includes a lid opening/closing detection means for detecting opening/closing of the dehydration lid; an operation restart means for stopping the dewatering operation in response to a lid opening signal from the means, retaining dehydration control data up to the lid opening, and restarting the dehydrating operation in response to a subsequent lid closing signal; and dehydration control data after the operation is resumed by the means. and a comparison means for comparing the dehydration control data up to the opening of the lid, and controls the end of the dehydration operation based on the comparison result by the comparison means.One embodiment thereof will be described in detail below.

FIG. 1 is a front view showing the main parts of the dehydration sensor, and FIG. 2 is a side view of the same, showing a ceramic piezoelectric element 12 (hereinafter referred to as a piezoelectric element. Electrodes are formed on each side of the piezoelectric element 12), The metal diaphragm 11 is electrically connected to one electrode surface of the piezoelectric element 12 and is bonded to the electrode terminal 13.1.
Figure 3 shows the appearance of the dehydration sensor 10.
is an electrically insulating case. 17a-d are stop holes.

FIG. 4 is a sectional view taken along the line AA' in FIG. 3, in which the piezoelectric element 12 and metal diaphragm 11 shown in FIG.
and 15 indicate a state in which it is fixed so that it can vibrate. 15a is a circular protrusion provided on the case.

FIG. 5 is a cross-sectional view of the essential parts when the dehydration sensor 10 is attached to the dehydrator, in which 1 is the machine frame, and the machine frame 1 is equipped with a motor that drives the dehydrator tank 5 via a cushioning material (for example, a spring) 4. 2 is installed. The dewatering tank 5 is connected to the motor 2 through a shaft 3. Reference numeral 6 is a water receiving tank located on the outer periphery of the dewatering tank 5 for receiving the dehydrated liquid, and a drain pipe 7 is connected to a part of the bottom of the tank. The dehydration tank 5 has an appropriate number of holes 8a to 8d through which the dehydration liquid passes. The dehydration sensor 10 is provided so as to face several (nine holes in this embodiment) holes 8a formed in the lower part of the dehydration tank 5.

FIG. 6 is an enlarged cross-sectional view of the main part showing the state of manufacture of the dehydration sensor 10. The case 15 of the dehydration sensor 10 is the water tank 6
It is tightly fixed to the water receiving tank 6 with a screw 19 and a nut 20 via a gasket 18a so as to close a hole made in the water tank 6. Protrusion 15aH deviation/18a of case 15
It's eating into the.

18b is also Patsukin. The arrows indicate where the water droplets collide.

FIG. 7 is a block diagram of the main parts of the electronic control circuit that controls the dehydration process. The detection unit 21 includes an amplification circuit 22 that amplifies the output voltage of the dehydration sensor 10, and an amplification circuit 22 that amplifies the output voltage of the dehydration sensor 10. , a comparison circuit 2 provided to compare with a constant voltage and output only when the voltage is equal to or higher than the constant voltage.
3, a peak value hold circuit 24 that generates an output that is discharged in a longer time when there is an output (one output is for a short time) via the comparator circuit 23, and a peak value hold circuit 24 that generates an output that is discharged in a longer time than the output (one output is short time), and when the output exceeds a certain voltage. It consists of a comparator circuit 25 which outputs an L signal and outputs an H signal when the output falls below a certain voltage.

In FIG. 7, 26 is a start switch for starting the dehydration process, and 100 is a controller composed of a microcomputer. The basic configuration of the controller 100 and its relationship with external circuits are shown in FIG.

101 is a CPU, 102 is a program/fixed data memory ROM, and 103 is a temporary storage memory RAM.

104 is a timer, and 105 is an I10 section (input/output section). 27 is a lid switch that responds to the opening and closing of the dehydration lid; 28 is a drive circuit that turns the motor 2 ON/OFF according to the output of the controller 100; in FIG.

30 and 32 are the windings of the motor 2, and 31 is a capacitor.

FIG. 9 is a model diagram showing the dehydration rate and the output change of the detection unit 21. The output of the detection unit 21 becomes an H signal from the start of dehydration until the water droplets collide with the dehydration sensor 10, and When the water droplets from the water tank 5 begin to collide with the dehydration sensor 10, the L signal changes to an L signal, and this L signal indicates that as dehydration progresses, the number of water droplets from the dehydration tank 5 rapidly decreases, and the amount of water droplets that collide with the dehydration sensor 10; It continues until the intensity decreases and then switches to the H signal. On the other hand, the change in the dehydration rate is rapid for a while after the start of dehydration, and when the dehydration rate reaches approximately 40%, it changes from rapid to slow, and the point where the dehydration rate changes from rapid to slow is when the signal from the detection unit 21 is L. It coincides with the point where H becomes H.

In order to completely squeeze out the dehydrated product, it takes about three times as long as the time required from the start of dehydration to the point at which the signal from the detection unit 21 becomes L-H.

Next, an example of control of the dewatering operation will be explained according to the flowchart of FIG. 10. First, start switch 26
Turn on. The L input of It turns the start switch 26 O.
When confirming N and initial setting T4=0, then confirming that the lid switch 27 is ON, the output of 01 is set to H, the motor 2 is driven by the drive circuit 28, the timer 104 is started, and dehydration is started. do. Then, it is repeatedly determined whether the output of the detection unit 21 is 12=L until a certain period of time has elapsed, and when it is determined that l2=L, next l2=
Wait until it becomes H, and when l2=H, read the data T of the timer 104 and store it as I5.
Calculate the dehydration completion time T'+(Tt='rsxa> from .) Then, determine whether the timer data T is T≧Tl, and if T≧Tl, the dehydration is complete, so output 01. L, the motor 2 is stopped via the drive circuit 28, the timer 104 is stopped, and the timer data is cleared.

On the other hand, during a certain period of time after the start of dehydration, l
When 2 does not become L, it is determined that there is some kind of abnormality,
The dehydration completion time T+ is set to a predetermined short time, and when the timer data T becomes T≧TI, the motor 2 is stopped, the timer 104 is stopped, and the timer data is cleared.

Normally, the dewatering operation is controlled as described above, and during this time the lid switch 27 is always turned on.

OFF, that is, the opening and closing of the dehydration lid is confirmed, and if the dehydration lid is opened during the dehydration operation and the lid switch 27 is confirmed to be OFF, the motor 2 is stopped and the dehydration operation is interrupted.
Then, the data T of the timer 104 at this time is read and set as I3. Next, the detection unit 2 until the dehydration lid is opened.
The dehydration completion time T2 is calculated based on the signal No.1. for example,
Before the dehydration lid is opened, if the signal from the detection unit 21 is I2=L and then l2=H, read out the data T5 when l2=H and based on this. Calculate the dehydration completion time T2 (T2=T5 X3). If the dehydration lid is opened before the signal from the detection unit 21 reaches Iz''H, the dehydration completion time T2 (T2=T3X3) is calculated based on the timer data T3.

Thereafter, the remaining dehydration time T4 (T4 = T2 I3) is calculated from the dehydration completion time T2 and timer data T3, the timer 104 is stopped, the timer data T is cleared, and the process waits until the lid switch 27 is turned on. Then, the dehydration lid is closed and the lid switch 27 is turned on.
Then, the output of 01 is set to H again to drive the motor 2 to restart the dewatering operation, and the timer 104 is started. After restarting the operation, calculate the dehydration completion time TI as described above based on the signal from the detection unit 21. Next, compare the dehydration control data up to opening the lid with the dehydration control data after restarting the operation, that is, compare T4 and T1. In comparison, T
4> If T t, the motor 2 is dehydrated until the timer data T becomes T≧T4, or if T 4 < T 1, the timer data T becomes T≧T+. The timer 104 is stopped and the timer data is cleared.

As described above, by comparing the dehydration control data up to the opening of the lid with the dehydration control data after restarting operation and controlling the end of the dehydration operation based on the results, the dehydration lid can be opened to correct the imbalance. Even if the dehydration lid is opened to add dehydrated material, dehydration will not be insufficient, and of course, dehydrated material added midway through can be sufficiently dehydrated.

(Effects) As described above, the dehydration control method of the present invention does not cause insufficient dehydration due to opening and closing of the dehydration lid during the dehydration operation, and is excellent in practice.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, FIGS. 1 and 2 are front and side views showing the main parts of the dehydration sensor, FIG. 3 is a front view of the dehydration sensor, and FIG. 4 is A of FIG. 3. -A' sectional view,
Fig. 5 is a schematic cross-sectional configuration diagram of a dehydrator equipped with a dehydration sensor, Fig. 6 is a sectional view showing the state in which the dehydration sensor is installed, Fig. 7 is a block diagram of the main parts of the electronic control circuit, and Fig. 8 is a controller and FIG. 9 is a diagram showing the relationship between external circuits, FIG. 9 is a diagram showing an example of a temporal change in dehydration rate and an output signal of the detection section, and FIG. 10 is a dehydration control flowchart. 5: Dehydration tank, 10: Dehydration sensor, 21: Detection section, 27: Lid switch, 100: Controller. Agent Patent Attorney Aihiko Fukushi (and 2 others) No. 17
Figure 2 Figure 5 1186 Figure 94 Ifv! JC portion) mq diagram

Claims (1)

[Claims] 1. In a device that controls the dehydration operation based on the data such as the amount of water that jumps out of the dehydration tank as dehydration control data,
Lid opening/closing detection means for detecting opening/closing of a dehydrating lid, and operation for stopping dehydrating operation in response to an open lid signal from the means, retaining dehydrating control data up to the opening of the lid, and restarting the dehydrating operation in response to a subsequent closing signal. and a comparison means for comparing the dewatering control data after restarting the operation by the means and the dewatering control data up to the opening of the lid, and controlling the end of the dewatering operation based on the comparison result by the comparing means. Dehydration control method.