JPH0790067B2 - Dehydrator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a dehydrator.

(B) Conventional technology As a conventional example, in order to prevent continuation of the dehydration operation in an abnormal vibration state due to the imbalance of the material to be dehydrated in the drum, the outer tank elastically supported in the frame has abnormal vibration. A dehydrator provided with the detection device is disclosed in Japanese Utility Model Publication No. 58-20235 (D06F37 / 04).

The abnormal vibration detection device is one in which a case having mercury and contacts inside is attached to the outer tank with a predetermined inclination, and the mercury is removed by the centrifugal force of the outer tank amplitude and shaking speed during spin-drying rotation. By contacting the contact and making it conductive,
Detects abnormal vibration.

(C) Problems to be Solved by the Invention In the structure of the conventional example, abnormal vibration is detected by the amplitude and shaking speed of the outer tub, so, for example, when the shaking speed is low but the shaking speed is low (when the shaking shakes slowly In many cases, the abnormal vibration at the initial stage of the spin-up of the dehydration rotation is small.

That is, in the conventional structure, there is a problem in that the detection accuracy of abnormal vibration varies depending on the size of the spin-drying rotation speed.

An object of the present invention is to provide a dehydrator capable of accurately detecting abnormal vibration and controlling dehydration regardless of the size of the dehydration rotation speed.

(D) Means for Solving the Problems The dehydrator of the present invention is an outer tub elastically supported in a frame, a drum rotatably supported in the outer tub, and containing a substance to be dehydrated, and the drum. And a vibration detector for outputting an electric signal according to the vibration acceleration of the outer tub, a rotation speed detector for outputting a signal according to the rotation speed of the drum, and the vibration detector. A reference value corresponding to an electric signal from the storage means for storing a plurality of predetermined rotation speeds, a vibration state measuring means for measuring the vibration state of the outer tub by a signal from the vibration detector, and the rotation speed. A rotation speed measuring means for measuring the rotation speed of the drum by a signal from a detector, and each time the rotation speed measured by the rotation speed measuring means reaches one of the plurality of predetermined rotation speeds, The measured value by the vibration state measuring means The comparison means for comparing with the reference value in the storage means corresponding to the predetermined rotation speed and the comparison result that the measurement value by the vibration state measuring means is larger than the reference value were obtained. In this case, the control means for instructing the rotation driving means to decrease the rotation speed of the drum is provided.

(E) Action That is, since the reference value for judging abnormal vibration is set according to the spin-drying speed, the detection accuracy is almost constant at all times.

(F) Example An example of the present invention will be described with reference to the drawings.

In FIG. 2, 1 is a frame, 2 is an outer tub elastically supported in the frame 1 by springs 3 ... and shock absorbers 4 ... 5 is a lateral rotatably supported in the outer tub 2. Although it is a shaft type drum, it has a large number of through holes (not shown) around it. 6 is a drive pulley fixed to the rotating shaft of the drum 5, 7 is a drive motor fixed to the outer bottom of the outer tub 2, and is connected to the drive pulley 6 via a small pulley 8 and a belt 9. There is. 10 is the outer tank 2
It is an acceleration sensor fixed to the upper part of the, and as shown in FIGS. 3 and 4, a thin disk-shaped piezo plastic film 11 is used as a vibrator, the outer tub 2 vibrates, and acceleration is applied to the acceleration sensor 10. When added, the oscillator vibrates and the displacement is converted into an electric signal. 12 is an impedance converter and 13 is an amplifier. This acceleration sensor 10 is
As shown in the figure, if a voltage of ± 6 V is applied, an output voltage of ± 0.2 V per acceleration of 1 G can be taken out from the output terminal VOUT. That is, according to the acceleration sensor 10, an output voltage proportional to the acceleration can be obtained as shown in FIG.

Reference numeral 14 denotes a reed switch attached to the outer tub 2, which is turned on and off by a magnet 15 attached to the drive pulley 6. That is, each time the drive pulley 6 makes one rotation, the reed switch 14 is turned on and off. This ON-OFF signal is input to the microcomputer described later via the monostable multivibrator, and the microcomputer counts this ON-OFF signal to determine the rotation speed of the drive motor 7 (drum 5) per unit time. I can know.

Now, FIG. 6 shows the microcomputer in this embodiment.
A control mechanism centering on 16 (hereinafter referred to as a microcomputer) is shown. The microcomputer 16 includes an input key circuit 17 including various operation key groups, a water level sensor 18, and the acceleration sensor.
10, the load 19 such as the drive motor 7 and the solenoid, and the display device 20 based on the information from the reed switch 14 and the like.
Etc. to control the operation.

Since the structure of the microcomputer 16 is well known, it will be briefly described with reference to FIG.

The microcomputer 16 includes a CPU 21 (central processing unit).
t), RAM22 (random access memory), ROM23 (read on
ly memory), a timer 24, a system bus 25, and input / output devices 26 and 27.

The CPU 21 is composed of a control unit 28 and a calculation unit 29, the control unit 28 fetches and executes an instruction, the calculation unit 29, by the control signal from the control unit 28 in the instruction execution stage. Performs arithmetic processing such as binary addition, logical operation, increase / decrease, and comparison on data given from an input device or memory. The RAM 22 is for storing data related to the device, and the ROM 23 is configured to read in advance means for operating the device, setting conditions for determination, rules for processing various information, and the like. It is something to put.

Now, in this embodiment, if the distribution of the substance to be dehydrated in the drum 5 is unbalanced, the rotation of the drum 5 is not smoothly performed, and the outer tub 2 vibrates abnormally. The table below shows the allowable amplitude of the outer tub, the acceleration at this time, and the output of the acceleration sensor 10 at each rotation speed from the start of the spin-drying rotation to the steady state (600 rpm). Each sensor output G is stored in the ROM 23 in advance.

In addition, the allowable acceleration is determined at the drum rotation speed of 600 rpm, and the allowable acceleration is determined in inverse proportion to the square of the rotation speed.

The dehydration operation based on such a configuration will be described with reference to FIG.

Dehydration time measurement (S-1), drum rotation (drive motor 7O
N) (S-2) is started, and at the same time, the rotational speed data A of the drum 5 and the output data G of the acceleration sensor 10
(S-3: Corresponding to rotation speed measuring means of the present invention) (S-4: Corresponding to vibration state measuring means of the present invention).

Since the rotational speed A of the drum 5 starts to rise gradually with the passage of time, at the time of 100 <A ≦ 200, the rotational speed 200 rpm stored in the sensor output G and the ROM 23.
Is compared with the reference output (120 mV) corresponding to (S-5),
When G ≧ 120, it is judged that abnormal vibration due to dehydration imbalance is occurring, and the timing is interrupted (S-6).
At the same time, the drum 5 is stopped (S-7). Then, 2 seconds after the drum 5 is completely stopped, the timing is restarted (S-8), and the deliquoring is performed from the beginning for the remaining time.

Similarly, when 200 <A ≦ 300, a reference output (240 mV) corresponding to a rotation speed of 300 rpm, and when 300 <A ≦ 400, a reference output (360 mV) corresponding to a rotation speed of 400 rpm, and 400 <A ≦
At 500, the standard output (440 mV) corresponding to a rotation speed of 500 rpm
When 500 <A, the reference output corresponding to the rotation speed of 600 rpm is compared with (S-9) to (S-12), and when the reference output is exceeded, (S-6) to (S- The same operation as 8) is executed.

When the timing is finished, the drum 5 is stopped (S-13),
When A ≦ 10, the deliquoring operation is finished.

In this embodiment, when abnormal vibration is detected, the timing is interrupted, but the timing may be reset.

(G) Effect of the Invention According to the configuration of the dehydrator of the present invention, the accuracy of detecting abnormal vibration is high regardless of the number of rotations of the drum, so that efficient dehydration can be performed.

[Brief description of drawings]

1 (a) and (b) are flowcharts showing the operation of the dehydrator of the present invention, FIG. 2 is the same internal mechanism diagram, FIG. 3 is the internal structure diagram of the acceleration sensor, and FIG. 4 is the same electric circuit diagram.
FIG. 5 is the same output characteristic diagram, FIG. 6 is a block circuit diagram of the control mechanism, and FIG. 7 is a block configuration diagram of the microcomputer. 1 ... Frame, 2 ... Outer tank, 5 ... Drum, 7 ... Drive motor (drive means), 10 ... Acceleration sensor (vibration detection means), 14 ... Reed switch, 15 ... Magnet (14, 15:
Rotation speed detection means), 23 ... ROM (storage means), 28 ... control section (control means), 29 ... calculation section (comparison means).

Claims (1)

[Claims] 1. An outer tub elastically supported in a frame, a drum rotatably supported in the outer tub for accommodating articles to be dehydrated, a rotation driving means for rotationally driving the drum, and the outer tub. A vibration detector that outputs an electric signal corresponding to the vibration acceleration of the drum, a rotation speed detector that outputs a signal corresponding to the rotation speed of the drum, and a plurality of reference values corresponding to the electric signal from the vibration detector. Storage means for storing each of the predetermined number of rotations,
Vibration state measuring means for measuring the vibration state of the outer tub by the signal from the vibration detector, rotation speed measuring means for measuring the rotation speed of the drum by the signal from the rotation speed detector, and this rotation speed measurement Each time the rotation speed measured by the means reaches one of the plurality of predetermined rotation speeds, the measured value by the vibration state measuring means at this time is set as a reference value in the storage means corresponding to the predetermined rotation speed. When the comparison result of the comparison means and the comparison result that the measurement value by the vibration state measurement means is larger than the reference value is obtained by the comparison means, the rotation driving means is set so that the rotation speed of the drum is reduced. And a control means for instructing the dehydrator.