JPH0732838B2 - Dehydrator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a dehydrator for dehydrating clothes and the like.

Conventional technology Conventionally, in a dehydrator for dehydrating household clothes, the motor is continuously energized to rotate the dehydration basket, so it is driven at high speed (about 1400 ^{rpm for} 50Hz specifications and 1700 ^{rpm for} 60Hz). Was.

In this dehydrator, with a cloth made of chemical fiber such as cutter shirts and high-class women's underwear, the number of revolutions is high and wrinkles are extremely large.Therefore, the switching circuit turns on / off the motor energization during dewatering to reduce the energization time ratio. A dehydrator having a control circuit for controlling has been invented. (Patent application Sho 60-96914
issue). Also, a dehydrator has been invented which is provided with a control means for controlling the on / off time and the dehydration time of a drive means for driving a dehydration motor depending on whether the power supply voltage detection means of the dehydrator is high or low.
(Patent application Sho 60-96915).

Problems to be Solved by the Invention In the conventional dehydrator, as shown in FIG. 5, a dehydration basket 1 housed in a dehydration receiving tank 4 is connected to a motor 3 via a dehydration shaft 2. The dewatering shaft 2 is slidably supported by a vibration-proof cushioning rubber provided at the bottom of the dewatering receiving tank 4. Further, the motor 3 is fixed to the underframe by a vibration-proof spring 6. A rubber tube 7 is provided on the outer circumference of the vibration-proof spring 6.

The anti-vibration of the dehydration basket 1 is composed of the anti-vibration spring 6, the rubber tube 7 and the buffer rubber 5.

When the resonance speed of the anti-vibration device becomes equal to that of the motor at the time of starting the motor, the dehydration basket 1 has the maximum amplitude, and as the speed of the motor 3 increases, the anti-vibration effect is obtained and the amplitude becomes smaller. . FIG. 6 shows the number of rotations of the motor and the swing of the dewatering receiving tank 4 of the dewatering device having the above structure.

In the figure, A is the primary resonance point of the anti-vibration device, B is the secondary resonance point of the harmonic point, and the rotation speed of the motor is 600 ^rpm and 120 ^rpm , respectively.
It is around 0 ^rpm .

In order to reduce the amplitude of the resonance point, it is common to stabilize the starting characteristic of the motor by, for example, improving the rotation torque and making the passage time of the resonance rotation speed as short as possible.

However, as described above, in the case of controlling the motor rotation to prevent the chemical fiber cloth from wrinkling, the spin of the dehydration basket is not rotated at a high speed, but is rotated at a low speed. Was a problem.

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention aims to provide a dehydrator having stable rotation of a dehydration basket and less wrinkling of cloth.

Means for Solving the Problems In order to solve the above problems, the dehydrator of the present invention continuously applies an AC voltage until the resonance speed of the vibration isolation structure during dehydration start is exceeded, and exceeds the resonance speed. And a control circuit and a switching circuit that turn on and off at a zero volt timing of an AC waveform to control a rotation speed lower than the rotation speed during continuous energization.

Operation With this configuration, AC power is directly applied to the motor from the start of dehydration until the resonance speed of the anti-vibration device is exceeded, so the motor starts up well and the resonance speed is passed in a short time so that The swing is small. Since the motor rotation speed is controlled at a low speed after passing through this resonance rotation speed, the centrifugal force applied to the cloth can be reduced and wrinkles can be reduced.

Example Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4.

In FIG. 1, a switching circuit 10 and a motor 3 are connected in series from an AC power source 8, and the motor 3 is a dehydration basket 1
To drive. The timer circuit 9 is a circuit that controls the time period from the start of spin-drying until the vibration-resonance resonance speed is reached and the low-speed spin-drying rotation time period. The control circuit 11 is a circuit for controlling energization of the motor 3 by the timer circuit 9, and controls the rotation of the motor 3 via the switching circuit 10.

FIG. 2 is a time chart of the timer circuit 9. The main time period is t seconds in the entire time period of the wrinkle prevention dehydration operation. This t
Of the seconds, it consists of a time period t ₁ second until the resonance speed of the vibration isolator is exceeded and a low speed rotation control time period t ₂ seconds of the dehydration basket. During the time t ₁ seconds until the resonance speed is exceeded, the control circuit 11 directly applies the AC power supply to the motor 3 to start the motor 3 at the same speed as during high-speed dehydration. In order to rotate the dehydration basket and the low speed after t ₁ sec, the control circuit 11 eliminates one cycle of the alternating current as shown in FIG.

This is because by applying a trimac gate voltage to a trimac or the like of the switching circuit 10 of the motor 3 as shown in FIG. (Deleted) Apply the intermittent waveform power supply to control the rotation.

FIG. 4 shows the number of rotations of dehydration and the swing of the dehydration receiving tank when dehydration was performed in this example.

As can be seen from the figure, around 600 ^rpm of the primary resonance point passes in a short time of 2 to 3 seconds because AC power is directly applied to the motor, so the rotation of the dehydration basket rises smoothly. The AC waveform control of the AC power supply is performed from around 900 ^rpm, and low speed rotation is obtained.

Therefore, in the dehydration of a fabric such as a chemical fiber which is easily wrinkled, the centrifugal force applied to the fabric is reduced, so that low speed rotation can be obtained and the vibration of the dehydrated car at the time of start-up can be stabilized.

EFFECTS OF THE INVENTION As is apparent from the above-described embodiments, according to the present invention, the resonance speed of the vibration isolator at the time of starting dehydration and after the start of dehydration is quickly passed without increasing the swing of the dehydration car abnormally. Since it can lead to low speed rotation dehydration rotation, it is possible to prevent the generation of wrinkles due to centrifugal force such as a cutter shirt and women's underwear, and to perform dehydration with less vibration. Also, since the motor that drives the dehydration basket is turned on and off at the zero volt timing of the AC waveform, for example, 30 seconds per second
It can be switched on and off once, and the dehydration speed can be switched more gently and smoothly than in the conventional case where a mechanical switch such as a time switch is used, compared with a switching circuit that switches every minute, for example. As a result, it is possible to prevent the occurrence of wrinkles that occur when the dehydration rotation speed is switched.

[Brief description of drawings]

FIG. 1 is a block diagram of a dehydrator in an embodiment of the present invention, FIG. 2 is a time chart of the timer circuit, FIG. 3 is a power waveform diagram of the control circuit and a switching circuit, and FIG. 4 is the dehydrator. FIG. 5 is a characteristic view showing the relationship between the number of rotations of the motor of the apparatus and the swing of the dehydration receiving tank, FIG. 5 is a sectional view of the dehydrator, and FIG.
It is a characteristic view which shows the relationship between the motor rotation speed of the conventional dehydrator and the swing of the dehydration receiving tank. 1 ... dehydration basket, 3 ... motor, 8 ... AC power supply, 9 ...
… Timer circuit, 11 …… Control circuit, 10 …… Switching circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-60-234697 (JP, A) JP-A-54-39964 (JP, A) Practical application Sho-55-153086 (JP, U)

Claims (1)

[Claims] 1. An anti-vibration motor, a dehydration basket driven by the motor, a timer circuit for measuring the time from the start of the motor, and a motor supplied with an alternating current with an AC waveform. Switching circuit that turns on and off at zero volt timing, and this switching circuit turns on,
A control circuit for controlling the off state is provided, and the control circuit inputs the time until the resonance rotation speed of the vibration isolation structure at the time of dehydration start is input from the timer circuit, and controls the switching circuit until the time is reached to control the alternating current to the motor. A dehydrator that continuously energizes the power supply, and when the resonance speed is exceeded, controls the waveform of the AC power supply using a switching circuit to intermittently energize.