JPS61280885A - Dehydrator - 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] (b) Industrial application field The present invention relates to a dehydrator.

(B) Conventional technology Conventional dehydrators or washing machines with a dehydrating function rotate the dehydrating tank in one direction at high speed during dehydrating, as shown in, for example, Japanese Utility Model Publication No. 59-38231. The dehydrated product was dehydrated by centrifugation.

However, in recent years, there has been a demand for shorter washing and spin-drying times, and in particular, fully automatic washing machines have built-in spin-drying processes after washing, after rinsing, and during spin-drying, which reduces spin-drying time. This is especially desired because it leads to a reduction in the total process time.

(c) Problems to be Solved by the Invention The present invention aims to shorten the dehydration process time.

(d) Means for Solving the Problems The present invention provides a centrifugal dehydrator with a frequency conversion device that converts the power supply frequency and increases the frequency of the voltage applied to the drive motor in stages.

(e) Effect: By increasing the frequency of the voltage applied to the motor in stages, the rise characteristics of the inner tank during dehydration are improved.

Kube) Example Embodiments of the present invention will be described with reference to the drawings.

In the washing machine shown in Fig. 1, (1) is the machine frame, (2) is an outer tank elastically supported by a hanging rod (3) within the machine frame (1), and (4) is an outer tank ( 2) has a drain hole in the bottom with a part of the bottom recessed, (5> is an inner tank with a tapered top built into the outer tank (2), and (6)... is an inner tank. A dewatering hole is provided only at the top of the tank (5), (7)... is a baffle that is integrally formed in the vertical direction along the inner wall of the inner tank (5), and (8) is located at the bottom of the inner tank (5). Wing body integrally formed in a radial manner, (9)
is the balance ring at the top of the inner tank. (10) is the bearing part, (11) is the drive motor, (12) is the brake drum,
(13) is a heater installed near the drain port (4) at the bottom of the outer tank (2), (14) is a water supply device for supplying water between the inner and outer tanks (5) and (2), and (15) is the top lid. . <16) is the bottom of the outer tank (2) to detect the water level in the outer tank (2).
Air trap installed in the corner, pressure hose (17)
A water level switch (18) is connected through it. (1
9) is a circulation waterway that communicates between the drain port (4) and the upper part of the inner tank (5), and (20) is a pump installed in the circulation waterway (19), and the circulation waterway (19) and the pump ( 20) constitutes a liquid return means, which uses a pump (20) to pump up water between the inner and outer tanks, discharges it from the discharge port <21>, and supplies it into the inner tank 5). <22> is a drain solenoid valve interposed between the drain port (4) and the drain hose (23).

Next, in the circuit diagram of Figure 2, (24) is the drive motor (
11), a control device that controls the operation of various loads such as (2)
5) is a safety switch that is linked to the opening and closing of the top cover (15);
26) is a water supply solenoid valve, (27) is a solenoid for brake operation, and <20a) is a pump motor. The contact point of the water level switch (18) becomes N when the water level reaches a specified level.
The switch is made from the C side to the NC side, and at the same time the current supply circuit to the heater (13) is cut off. (28) is a thermistor for temperature adjustment,
And (29) is a frequency converter that controls the frequency related to the number of rotations of the drive motor (11).
11) Since the rotation speed is proportional to the frequency, 6
This is to convert the power frequency of 0Hz (50Hz>) to obtain the desired rotation speed.

The operation of this configuration will be explained based on FIG. 3.

When the start switch (not shown) is operated, the water supply solenoid valve (26) opens and water supply starts between the inner and outer tanks (5) and (2).When the water level reaches the specified value, the pressure switch (18) is opened.
is switched from the NC side to NO (It), the heater (13
) is cut off and stops heating water. At the same time, the water supply valve 26 closes, the pump motor 20a starts operating, and the water between the inner and outer tanks (5) and 2 is transferred from the outlet 21 into the inner tank 5. Furthermore, at the same time, the drive motor (11)
is energized, and the inner tank (5) is rotated clockwise (approximately 1 to 3 seconds) - stopped (approximately 2 to 4 seconds) - counterclockwise (approximately 1 to 3 seconds) - stopped, and the cycle is repeated for approximately 2 to 3 minutes. When the water level between the inner and outer tanks (5) and (2) decreases with the operation of the pump motor (20a), the water level switch (
18) is reset, the contact is switched to the NC side again, and the pump motor (20a) is stopped.

In this way, in this embodiment, before water is supplied into the inner tank (5),
Since water is stored between the inner and outer tanks (5) and (2) and the water volume is detected, there is no need to use complicated water level detection means or to install a separate tank for water level detection. Since the inner tank (5) was rotated at the same time as water was supplied, the detergent and water penetrated into the laundry evenly and quickly, and the sandalwood (5) was rotated.
By stopping the laundry, "pounding washing" in which water-containing laundry is washed by colliding with the baffle (7) can be carried out from an early stage, thereby improving detergency and shortening the grinding process time.

During the washing process, the laundry in the inner tub (5) floats in the tub as the inner tub (5) rotates, and the baffle (
7) and is washed away.

At this time of stop, if the power to the motor (11) is simply cut off, the dandelion (5) will rotate by inertia, and the direction of this inertial rotation is the same as the floating direction of the laundry, so the baffle of the laundry ( 7), the collision force against the object is weakened, and the cleaning power is also reduced.

Therefore, the power to the motor (11) is cut off and the inner tank (
5) Apply a brake to the rotation. This braking means
A mechanical means for tightening the brake band (12) by cutting off the current to the solenoid (27) and an electric means for applying a direct current to the motor (11>), which are conventionally known techniques, are used in combination.

In this way, by suddenly stopping the inner tank (5),
The collision force of the laundry against the baffle (7) is increased, and the effect of "pounding washing" is improved.

Furthermore, during the cleaning step, the frequency converter (
29) sets the frequency of the voltage supplied to the drive motor (11) to 3
0Hz, and the rotation speed of the drive motor (11) is approximately 800r.
It is controlled at pm. That is, the inner tank (5) rotates at a relatively low speed of about 270 rpm, which is the rotation speed of the drive motor (11) further reduced to ⅓ by the pulley and belt.

Therefore, the inner tank can be started with high torque, and the tank can be forcefully reversed against the inertial force and heavy pressure of the tank, thereby improving cleaning power. Furthermore, water splashing can be suppressed by low-speed reversal.

When the cleaning process is completed, a deliquidation process starts for about 30 seconds to 1 minute by rotating the inner tank (5) clockwise at high speed. In other words, as the inner tank rotates at high speed, the washing liquid in the tank flows through the dewatering hole (6) along the tapered shape of the wood due to centrifugal force.
・The liquid is discharged from the upper opening of the tank, and the liquid removal is completed.

In this dewatering step, dirt is separated from the laundry and removed by passing the laundry liquid between the fibers of the laundry at high speed.

Furthermore, during this dewatering step, the frequency converter (
29) starts the inner tank with high torque using a starting special voltage of 30 Hz, and then gradually increases the frequency linearly to 4.
The rotation speed of the inner tank (5) is increased gradually from 0 Hz to 60 Hz to 400 Hz, and finally reaches about 11000 rpm.

In this way, when the frequency is increased stepwise using the frequency converter (29), as shown in Fig. 4, the predetermined rotational speed is reached faster than before (good rise characteristics). The dehydration time can be reduced accordingly.

Particularly in the case of repeating the washing step and the dewatering step as in this embodiment, shortening the dewatering step time is more effective.

In addition, in the same figure, the dotted line shows the rotational characteristics of the conventional dehydration tank, and is the case where the power supply frequency is 60 Hz (50 Hz).

Now, the discharged washing liquid is stored between the inner and outer tanks (5) and (2), and the pump (20) returns this washing liquid to the inner tank (5>) at the same time as the second wash. The washing process (approximately 1-3 minutes) begins.

Thus, the washing process and the dehydrating process are repeated twice,
During the final liquid removal step, the drain electromagnetic valve (22) is opened to drain the washing liquid and complete the "washing" of the laundry.

Here, in this example, the wave number conversion device! t(29) changes the frequency of the voltage applied to the motor during the cleaning process and the deliquification process, rotates the inner tank at low speed during the cleaning process, and rotates the inner tank at high speed during the deliquification process. Therefore, the structure is simple because there is no need for a power transmission mechanism that decelerates the rotation of the motor during low-speed reversal and transmits the rotation as it is without decelerating during high-speed rotation, as in the prior art.

Furthermore, since a three-phase induction motor is used as the drive motor, the motor is smaller than the conventionally used single-phase induction motor.

Hereinafter, "rinsing" is performed by performing the same operation as the "washing" with fresh water, and "dehydration" is performed by performing the dehydration step for about 3 minutes.

As mentioned above, in this embodiment, water only needs to be supplied to the inner tank (5) during washing, and the amount of water used is lower than in a case where a dehydration hole is provided around the inner tank and water is supplied to both the inner and outer tanks. The amount of water used is approximately 173, which is significantly less, and is suitable for water conservation.

Further, in order to store water in the inner and outer tanks, the sizes of the inner and outer tanks may be designed by considering the capacity of the inner tank and the capacity between the inner and outer tanks in advance.

Furthermore, since the inner tub (5) itself is rotated during washing, the laundry spreads outward due to centrifugal force, making it difficult for the laundry to become entangled with each other.

(G) Effects of the Invention In the present invention, in a centrifugal dewatering machine, the frequency of the voltage applied to the drive motor is increased stepwise by a frequency converter, so that the tank rotates at a predetermined rate due to the rise and fall characteristics of the tank. The time it takes to reach the desired number is shortened, and the dehydration process time can be shortened. Especially in a washing machine with a dehydrating function, the total process time can be shortened.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional side view of the main parts of the washing machine according to the present invention, Fig. 2 is the electric circuit diagram, Fig. 3 is a time chart during washing, and Fig. 4 is a diagram during the dehydrating process. It is a rotation characteristic diagram of an inner tank. (2)...Outer tank, (5)...Inner tank, (6)...Dehydration hole, (11>...Drive motor, (29)...Frequency converter.

Claims (1)

[Claims] (1) In a dehydrator that performs centrifugal dehydration by rotating an inner tank installed in the machine frame at high speed with a drive motor, the frequency of the voltage applied to the drive motor is increased in stages by converting the power frequency. A dehydrator characterized by being equipped with a frequency conversion device.