JPS6392388A - Water filling state alarm of washing machine - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF THE INVENTION The present invention relates to a full water alarm device for a two-pot type washing machine used in general households.

2. Description of the Related Art Conventionally, in a two-tub type washing machine, the user supplies water through a faucet, and the water supply is turned off when the water level reaches an appropriate level. However, if you leave the washing machine while it is being filled with water and forget about it, water will continue to overflow from the overflow port because the alarm system will not be activated.

In order to solve these problems, various methods for detecting full water have been proposed. Among these, the most common ones use rod-shaped electrodes or flat plate electrodes to detect and notify the resistance or capacitance of water.

Problems to be Solved by the Invention However, detection based on water resistance has the disadvantage that it is greatly affected by water quality and humidity. In addition, the method of detecting the capacitance of water has the drawback that the absolute value of the capacitance is very small, so the precision of the circuit must be improved, making the circuit complex.

The present invention solves these conventional problems and provides a notification device that has high detection accuracy, has a simple circuit configuration, and is not affected by water quality or the like.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a detection coil at the bottom of the overflow port of the washing machine, forms an oscillation means using this detection coil as a part, and this oscillation means The oscillation stop detection means determines whether or not it is in an oscillation state, and drives a notification means such as a buzzer.

Effect: With the above-described configuration, the present invention detects that when water comes into contact with the detection coil, the stray capacity in parallel with the detection coil increases rapidly, and the oscillation condition is no longer established, and the oscillation is stopped. It provides notification, has high detection accuracy, has a simple circuit configuration, and is highly reliable as it is not affected by water quality.

Embodiment FIG. 1 is a schematic diagram of a full-water alarm device for a washing machine showing an embodiment of the present invention. 1 is a washing tub, 2 is a pulsator, 3 is a motor for driving the pulsator 2, 4 is a drain hose, 5 is a drain valve, and 6 is a filter provided at the overflow part of the washing machine 1'l17'. 7 is a water overflow port, and a detection coil 8 is provided at the bottom thereof.

Reference numeral 9 represents an oscillation means which includes this detection coil as a part, and reference numeral 10 represents an oscillation stop detection means for determining whether or not the oscillation means 9 is oscillating. Reference numeral 11 denotes a notification means, for example a buzzer, which is driven by the output of the oscillation stop detection means 1Q. In addition, 12 is a water faucet, and 13 is water. Details of the vicinity of the overflow port are shown in Figure 2, and specific circuits are shown in Figures 3 and 4.
As shown in the figure.

Next, the operation will be explained based on FIGS. 1 and 2.

The washing machine shown in FIG. 1 is normally a two-tank type washing machine, and water is supplied from a water faucet 12 and is turned off when a suitable water level is reached. If the user forgets to stop the water supply, water overflows from the overflow lower and is drained through the drain hose 4. The filter 6 is used to prevent lint and the like from entering the overflow lower.

Here, when the water 13 comes near the overflow port T, the detection coil 8
comes into contact with water, so the stray capacity of the detection coil 8 increases. Next, the full water notification device will be explained based on FIG.

FIG. 3 shows a circuit of the full water warning device, in which the oscillating means 9 connects the detection coil 8 to the input/output terminals of the inverter 14. The output of the oscillation means 9 is input to the oscillation stop detection means 1o. Here, only the alternating current is taken out by the capacitor 15, and the diode 1
6 and charges the capacitor 17. The output end of the oscillation stop detection means 1o is connected to a transistor 18, and connected to a transistor 19 at the next stage of the transistor 18.

4. When the detection coil 8 is not in contact with water, the oscillation condition is satisfied and the oscillation means 9 is oscillating. Then, an alternating current portion of the output is taken out by the capacitor 16, which is rectified by the diode 16, and a voltage is generated in the capacitor 17. Then, transistor 18
Current flows through the base of transistor 18, turning on transistor 18. Then, the next stage transistor 19 is turned off and no current flows through the notification means 11, so there is no notification by a buzzer or the like.

Next, when water comes into contact with the detection coil 8, the stray capacity 20 increases as shown in FIG. 4, and the oscillation conditions for the oscillation means 9 no longer hold, and oscillation stops.

Then, no voltage is generated in the capacitor 17, and the transistor 18 is turned off. The transistor 6 base unit 19 is then turned on, and current flows through the notification means 11, so that a notification is issued.

In this way, when the water is full, a buzzer or the like is used to notify the user 2 that the water is about to overflow.

Effects of the Invention As described above, according to the present invention, a full water alarm device that is very convenient for users can be easily constructed with good detection accuracy, has little influence on water quality, and is highly reliable. It has an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing one embodiment of the device of the present invention, and FIG.
The figure is an enlarged sectional view of the overflowing part, FIG. 3 is a specific circuit diagram, and FIG. 4 is an equivalent circuit diagram of the stray capacity. 1...Washing tub, completed...Overflow port, 8...
・Detection Koinope 9... Oscillation means, 10...
...Oscillation stop detection means, 11...Notification means. Agent's name Patent attorney Toshi Nakao and one other person Roots to A9 2-11 - Tomihisa Ichihisa U coil 121 (-Tori Wandering j2-=-A 1 輼口) Uchiguchi g, 7 f3-yI<-δ 1 (f 2nd figure 8-11 cutting ℃ coil 9- departure Embankment + cutting f, 5.17---condenser C---da'°I λ-Y゛f8・(9-m-transistor Fig. 4

Claims (1)

[Claims] A detection coil provided at the bottom of the overflow opening of a washing machine, an oscillation means that includes the detection coil as a part, an oscillation stop detection means for determining whether or not the oscillation means is in an oscillation state, and an oscillation stop detection means. A full water notification device for a washing machine, comprising a notification means driven by the output of the washing machine.