JPH0226473Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a water injection and dehydration device that performs rinsing by dehydrating water while injecting water into a dehydration tank.

(b) Prior art It is important for this type of device to allow water to penetrate well into the laundry in the spin-drying tank, and for this purpose, the spin-dry tank is rotated intermittently, making it effective during low-speed rotation during braking or when stopped. This makes it possible to absorb water. For example, there is a method in which DC power is applied to the main winding or auxiliary winding of an induction motor that rotates a dehydration tank, and the motor is electrically braked to quickly stop the motor.

However, when DC power is applied to the windings that were previously receiving AC power, the rotation speed initially drops rapidly, but it takes a certain amount of time even if DC power is continued to be applied until it finally stops. It takes. Therefore,
As a result of applying DC power during this time, the temperature of the motor increases and power consumption also increases. In addition, noise is generated when DC power is applied, but when water is continuously poured into the dehydration tank, the so-called braking noise and the sound of water splashing overlap while DC power is applied, increasing the noise level. was.

(c) Purpose of the invention This invention suppresses the temperature rise of the entire motor while maintaining braking characteristics comparable to conventional ones by applying DC power at intervals, and also suppresses the temperature rise of the main and auxiliary windings. is averaged at a low level, and
This reduces power consumption. Furthermore, the noise level during continuous water injection is reduced.

(d) Structure of the invention The invention connects a first timer switch that is closed during a set time, a second timer switch, and a third switching type timer switch in series, and connects a DC converter in parallel to the second timer switch. The switching contacts a and b of the third timer switch are respectively connected to the main winding and auxiliary winding of an induction motor that rotates the dehydration tank into which water is poured. After opening, the third timer switch closes switching contact a, applies DC power to the main winding for a certain period of time (t ₂ ), and opens switching contact a after this certain period of time (t ₂ ). After this power-off time (t ₃ ), switching contact b is closed and DC power is applied to the auxiliary winding for a certain period of time (t ₄ ), and after this certain period of time (t ₄ ), switching contacts a and b are closed. This water injection and dewatering device is characterized in that it remains open until the second timer switch closes again. In other words, when braking, first apply DC power to the main winding for a short period of time to reduce the rotation speed, then turn off the power and allow rotation due to inertia to reduce the rotation speed, and then apply DC power to the auxiliary winding. It will eventually stop. Therefore, not only is no direct current power applied, but the power itself is cut off in areas where braking is not very effective during inertial rotation, so that temperature rise in the entire motor is reliably suppressed. Then, since the DC power is applied to the auxiliary winding, it is possible to average out the temperature rise of each of the main and auxiliary windings, thereby leveling out the lifespan of the parts. Also,
Power consumption inevitably decreases.

(e) Embodiment To explain the following based on the drawings, 1 is an AC power source, 2 is a single-phase induction motor that rotates a centrifugal dewatering tank (not shown) that is continuously injected with water during water injection and dewatering by a water injection means, and 3. 4 is the main winding and auxiliary winding of the motor, and 5 is a starting capacitor.

The dehydration timer has a display around it that shows the time for continuous rotation of the dehydration tank and a display for the number of times the dehydration tank is intermittently rotated.The time and number of times can be adjusted by manually operating the knob. is set.

Reference numeral 6 denotes the first switch of the dehydration timer, which is continuously closed during a set time and a set number of times. 7 is a second switch, 8 is a changeover type third switch, and these switches 6, 7, and 8 are connected to the AC power source 1 and the motor 2.
connected in series between.

A diode 9 is connected in parallel to the second switch 7 as a DC converting means, and when the second switch 7 is open, DC can be applied to the motor 2. Third
The switching contact a of the switch 8 is connected to the main winding 3 of the motor 2.
The switching contacts b are connected to the auxiliary windings 4, respectively.

The opening and closing states of the switches 6, 7, and 8 during water injection and dehydration are shown in the time chart of FIG. In addition, water is continuously poured into the dehydration tank at a rate of about 10 minutes per minute during the set time.

In Fig. 2, rinsing by water injection and dehydration is performed up to five times and at least three times while the first switch 6 is closed, but each time the second switch 7 is closed first. , the switching contact a of the third switch 8 is closed. In this way, alternating current is applied to the motor 2 from the main winding 3 side, and the motor 2 rotates clockwise at about 1400 rpm, dewatering the clothes in the dehydration tank and diluting the detergent liquid in the clothes. This dehydration time (t ₁ ) is about 50 seconds. Since only the second switch 7 is opened after the dewatering time (t ₁ ), direct current is applied to the motor 2 from the main winding 3 side. This first braking time (t ₂ ) is about 8 seconds.
During this first braking time (t ₂ ), the dehydration tank (motor 2)
The rotation speed of the engine clearly decreases. After this time (t ₂ ), the switching contact a of the third switch 8 is opened, and the power to the motor 2 is briefly cut off. This first power outage time (t ₃ ) is about 15 seconds, but since water is being poured during this time, the dehydration tank becomes even slower due to the resistance, and its rotational speed drops below 700 rpm. . After this first power outage time (t ₃ ), the switching contact b of the third switch 8 is closed, and this time DC is applied to the motor 2 from the auxiliary winding 4 side, and the dehydration tank, which was slowed down during the power outage, is operated. It almost stops. This second braking time (t ₄ ) is approximately
It is 15 seconds. Finally, after this time (t ₄ ), switching contact b closes, constituting a second de-energization time (t ₅ ) of about 40 seconds. Then, the water injection and dehydration cycle is completed once by the above time (t ₁ ) to (t ₅ ), and is repeated several times depending on the setting of the timer knob.

Thus, since direct current is applied to the motor 2,
Although heat is generated, since direct current is applied to both the main and auxiliary windings 3 and 4, the heat generation states of both can be averaged and leveled out. Also,
The amount of heat generated is reduced by the power outage time (t ₃ ) compared to when direct current is applied continuously, and power consumption is further reduced.

Furthermore, since there is no braking noise during the power outage period, the noise level is also reduced.

(f) Effects of the invention This invention suppresses heat generation in the motor windings, averages out the heat generation state in each winding, and reduces power consumption, making it possible to create an economical water injection/dehydration device with a long life. This is something that can be provided.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram of the water injection and dewatering device according to the present invention, and FIG. 2 is a time chart. 2...Single-phase induction motor, 3...Main winding, 4...Auxiliary winding, 6, 7, 8...1st, 2nd, 3rd timer switch.

Claims (1)

[Claims for Utility Model Registration] 1. A first timer switch, a second timer switch, and a switching type third timer switch, which are closed during a set time, are connected in series, and a DC conversion means is connected in parallel to the second timer switch. The switching contacts a and b of the third timer switch are respectively connected to the main winding and auxiliary winding of an induction motor that rotates the dehydration tank into which water is poured. After opening, the third timer switch closes switching contact a and applies DC power to the main winding for a certain period of time (t ₂ ),
After this certain period of time (t ₂ ), switching contact a is opened,
After this power-off time (t ₃ ), switching contact b is closed and DC power is applied to the auxiliary winding for a certain period of time (t ₄ ), and after this certain period of time (t ₄ ), switching contacts a and b are switched to the second A water injection and dewatering device that is characterized by being open until the timer switch closes again. 2. The water injection and dehydration device according to claim 1, which is a registered utility model, characterized in that water is continuously injected into the dehydration tank at least while the second timer switch is open.