JPS599200B2 - centrifugal dehydrator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a centrifugal dehydrator, and more particularly to a control device that enables strong and weak dewatering operation using single-pole motors (generally four motors).

Conventionally, centrifugal dehydrators use high-speed rotation to dehydrate clothing, which has the advantage of drying quickly in rainy weather, but on the other hand, synthetic fibers can wrinkle due to high-speed dehydration. This is especially a problem with fabrics that cannot be ironed.

The conventional method to solve this problem was to shorten the operating time compared to the strong spin drying time. The same is true when the cloth is not wrinkled, and it is not always possible to dehydrate the cloth sufficiently.Furthermore, it is difficult to set the timer for a short time.

On the other hand, it is conceivable to use a motor with a variable number of poles that can change the speed of the motor in two stages, and to have a structure that obtains a low speed when the motor is weak, but this motor does not change the number of poles. Compared to a motor without a motor, the productivity is higher, the cost is higher, the number of lead wires from the motor increases, a switch for changing the number of poles is required, the weight is heavier, the structure is more complicated, etc. There are problems and the causes of accidents increase, and the heavy weight increases the cost associated with installation, which is another disadvantage that makes the overall cost considerably higher.

The present invention was made to solve these problems, and will be explained below based on the drawings.

In FIG. 1, M is the motor of the centrifugal dehydrator, C is the capacitor, X and Y are the power terminals, and T is the dehydration timer, which has contacts S1 and S2 that operate simultaneously when the winding is completed.

This timer has a conventional main contact S that controls the time limit.
, is provided with an intermittent contact S2 that repeats ON and OFF intermittently at the same cycle when weak dehydration is set, and during this intermittent ON and OFF period, the rotation of the motor M does not reach the maximum rotation speed. The motor M is energized and turned off for a predetermined time at which the rotation speed is below the upper limit of the optimum dehydration rate described later, and the rotation speed of the motor M is maintained at the predetermined rotation speed, at least the rotation speed before stopping. It is configured so that it is turned on at a predetermined time such that the rotation speed is increased when the water is running, and the two types of dehydration shown in the diagram of FIG. 2 can be changed.

An example of the operation of the contacts S1 and S2 is shown in Figure 2.
Indicated by symbol 2.

In the same figure, the horizontal axis represents time, s', , s2
The hatched portion ' indicates the ON state of each contact.

Note that SF in FIG. 1 is a safety switch that opens and closes in conjunction with the lid of the dehydrator (not shown), and its contacts do not close unless the lid is closed, ensuring the safety of the user.

Next, a series of operations of the centrifugal dehydrator will be described. When the items to be washed are placed in a dehydration basket (not shown) and the lid is closed, the safety switch SF is closed.

Next, wind up the dehydration timer T and set it, contact S
, , S2 is turned ON as shown by the shaded area in Fig. 2,
In the case of strong dehydration, the dehydration motor M is connected to the timed main contact S1.
Continuously until it turns off, or in the case of weak dehydration,
Intermittent contact S2 is turned ON until timed main contact S1 is turned OFF,
Current is intermittently supplied according to the OFF state.

Fig. 3 shows an example of the dial display of the dehydration timer. For example, if the dehydration timer T is set to the strong dehydration range, the time main contact S1 to the dehydration motor M will be turned OFF as explained in connection with Fig. 2. Continuous current is supplied until

Further, when the dehydration timer T is set in the weak dehydration range, a current is supplied to the dehydration motor M according to the ON and OFF states of the intermittent contact S2 until the timed main contact S is turned OFF.

Figure 4 is a curve depicting the rotation versus time when the current explained in Figures 2 and 3 is supplied to the dehydration motor M, and the curve marked ■ is the one in which the dehydration timer T is set to strong dehydration. Similarly, the curve (■) indicates a state in which the dehydration motor M rotates at a lower speed than the rotation speed in strong dehydration when weak dehydration is set.

In experiments conducted by the present inventors, delicate clothing that tends to wrinkle when strongly dehydrated, such as synthetic Y-shirts and lingerie, was placed in a dehydration basket at 0.00%. 6 ky (
It was confirmed that the most effective time cycle for dehydration without causing wrinkles was to run it for 4 to 6 seconds using a monopolar mork, and then pause for 16 to 26 seconds.

Figure 5 is a curve depicting the above experimental results. If the curve goes above the shaded area, wrinkles will occur, and if it goes below the line, dehydration will be poor. According to this, delicate clothing It can be seen that the range that can be dehydrated without causing wrinkles by applying strong dehydration as in the past is extremely narrow.

However, it has been shown that when dehydration according to the present invention is carried out, dehydration can be carried out over a very wide range without wrinkles.

As described above, the present invention has the following effects by making it possible to switch the strength of dehydration using a single-pole motor without using a pole number changing motor.

That is, the cost of the motor can be significantly reduced, a changeover switch for polarity conversion is no longer required, and the number of lead wires can be reduced, making the wiring process easier.

In addition, by simply providing an intermittent contact that repeats intermittently at the same cycle in Jurai's one-contact type dehydration timer with timed control, it is possible to use cotton Clothing with a poor dehydration rate, such as clothing, can be strongly dehydrated to obtain excellent squeezing performance, while clothing with a good dehydration rate, such as synthetic fibers, can be dehydrated by dehydrating at a low rotation speed for an appropriate amount of time to prevent wrinkles. Moreover, it has great practical effects, such as sufficient dehydration and easy setting of dehydration time.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a centrifugal dehydrator showing an embodiment of the present invention;
Figure 2 is a diagram showing the ON/OFF state of each contact of the dehydration timer, Figure 3 is a diagram showing an example of the dial display of the dehydration timer, and Figure 4 shows the current shown in Figure 2 supplied to the dehydration motor. FIG. 5 is a diagram showing the relationship between strong and weak dehydration rates and time.

Claims (1)

[Claims] 1 A circuit that includes a timed control switch and an intermittent switch, and performs continuous dewatering until the timed control switch is opened; 1. A centrifugal dehydrator comprising: a circuit that performs dehydration by intermittent current supply to a motor so as to supply current until the rotational speed reaches a dehydration rate of .