KR0172930B1 - Dish-washer - Google Patents

Abstract

The present invention relates to a method of detecting leakage and supercharging of a dishwasher, and it is an object of the present invention to provide a method of detecting leakage and supercharging of a dishwasher by detecting a water level at an appropriate time regardless of the operation or stoppage of the washing motor during cleaning or rinsing, It is possible to prevent a safety accident such as a fire, a short circuit and an electric shock in advance.

Description

Detecting the leakage and supercharge of dishwasher

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher, and more particularly, to a leakage and supercharge water sensing method of a dishwasher for sensing and controlling when water supplied in a tub leaks or is likely to overflow the tub.

As shown in FIG. 1, the apparatus for detecting the level of a dishwasher generally includes a control unit 10 for controlling the system as a whole, a display unit 20 for displaying the progress of each stroke, a control unit 10, (Not shown) and a motor (not shown), a load driving unit 40 for driving each load such as a heater (not shown) and a motor And a water level sensing unit 50 for sensing a water level by generating a water level frequency according to the water level.

The water level sensing unit 50 includes a water level sensor 51 for generating an oscillation frequency in accordance with the water pressure and an inverter unit 52 for converting the oscillation frequency of the water level sensor 51 into a square wave and applying the square wave to the control unit 10 .

The leakage and supercharge water sensing method according to the related art by the water level sensing apparatus constructed as above will now be described with reference to the accompanying drawings.

FIG. 2 is a flow chart for performing leakage and supercharge water detection of the dishwasher according to the related art, and FIG. 3 is a table showing frequencies according to the level of the dishwasher according to the related art.

First, a water level frequency generated according to water pressure is applied to the water level sensing unit 50 of FIG. 1, and the water level is sensed by the control unit 10 (S101).

At this time, the water level according to the input water level frequency is programmed in advance in the control unit 10 as shown in FIG.

In step S102, it is determined whether the sensed water level is equal to the supercharged water level (22.5 kHz) according to the applied water level frequency (S102). If the water level is the supercharging water level, the drain valve is turned on to start water drainage (S103).

Then, when the drainage is advanced and the water level becomes lower than the reset water level (26.2 kHz) (S104), the drain valve is turned off (S106) after a predetermined time t1 for completely discharging the remaining water (S105).

Here, the predetermined time t1 for completely discharging the residual water is about 5 seconds.

If it is determined in step S102 that the detected water level according to the input frequency is not the supercharge water level, the washing or rinsing cycle is performed (S107).

If the cleaning motor is stopped during the cleaning or rinsing step (S108), the water level is detected after the cleaning motor is cured for a predetermined time (t2) (S109).

Here, the water level detection is performed for one second after a lapse of two seconds, which is a predetermined time t2, for three seconds, which is the stopping time of the washing motor.

In addition, the reason why the water level is sensed after a certain time has elapsed after the stop of the washing motor is that water is sprayed through the nozzle.

To detect the correct water level by sensing the water level after it has fallen.

If the sensed water level is less than the water level (24.8 kHz) (S110), all loads are stopped (S112).

If the sensed water level is not lower than the water level (S113), it is judged again whether the water level is equal to or higher than the supercharge water level (22.5 kHz) (S113).

At this time, if the water level is equal to or higher than the supercharging rate, an alarm is issued to notify the supercharger error (S114) and all loads are stopped (S112).

If the water level detected in the step S113 is not the supercharging water level, it is determined that the water level is the normal water level (23 kHz), the next stroke is continued (S115) and the entire stroke is completed (S116). This process is repeated continuously.

The leakage and supercharge water sensing method of the dishwasher according to the prior art can detect the leakage and the supercharging water only during the stoppage time of the cleaning motor during the cleaning or rinsing operation.

Therefore, there is a problem that water leaks in the tub during the operation time of the washing motor, so that the heater and the washing motor idly rotate without water in the tub, and thus the washing motor and the heater are overheated.

In addition, there is also a problem that various electrical components are locked by leakage and supercharged water.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method and apparatus for detecting leakage of a dishwasher, .

1 is a circuit diagram showing a level detecting device of a typical dishwasher.

FIG. 2 is a flow chart for performing a leakage and supercharging apparatus of a dishwasher according to the prior art; FIG.

FIG. 3 is a table showing frequencies according to the level of the dishwasher according to the prior art; FIG.

FIG. 4 is a flow chart for performing leakage and supercharge detection of a dishwasher according to the present invention. FIG.

The method of detecting leakage and supercharge of water in a dishwasher according to the present invention detects a water level at an appropriate time regardless of the operation or stop state of the washing motor during washing or rinsing, By stopping all the loads, it is possible to prevent safety accidents such as fire, short-circuit and electric shock.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a method of detecting leakage and supercharge of a dishwasher according to the present invention will be described in detail with reference to the accompanying drawings.

First, the level detecting apparatus of the dishwasher for implementing the present invention is the same as that of the first embodiment, and the frequency of the level of the dishwasher according to the present invention is also the same as that of the conventional third.

4 is a flow chart for performing leakage and supercharge detection of the dishwasher according to the present invention.

First, a water level signal generated in accordance with the water pressure is applied to the water level sensing unit 50 of FIG. 1, and the water level is sensed by the control unit 10 (S201).

At this time, the water level according to the inputted water level frequency is set in the third aspect and is preliminarily programmed in the control unit 10.

If the sensed water level is the supercharge water level (22.5 kHz) according to the applied water level frequency (S202), the water drain valve is turned on to start water drainage (S203).

Then, when the water level has progressed and the water level has become equal to or lower than the reset water level (26.2 kHz) (S204), the drain valve is turned off (S206) after a predetermined time T2 has elapsed to completely discharge the remaining water (S205).

Here, the predetermined time T1 for completely discharging the residual water is about 5 seconds.

If the detected water level according to the water level frequency inputted in the above step S202 is not the supercharge water level, the washing or rinsing cycle is performed (S207).

Next, the water level is sensed according to the water level frequency inputted during the washing or rinsing operation (S208).

If the water level frequency inputted to the control unit 10 is equal to or lower than the leakage water level (26.5 kHz) for a predetermined time T2 (S209) (S210), an alarm notifying of the water leakage error is generated (S211) .

On the other hand, if it is determined in step S209 that the water level is not the water level and the water level frequency inputted to the controller 10 is equal to or higher than the continuous water level (22.5 kHz) for a predetermined time T3 (S123) (S215) and stops all loads (S212).

If the level of the water level input to the controller 10 is not the supercharging water level, it is determined that the water level is the normal water level (23 kHz), and the next stroke is continued (S216) to complete the entire stroke (S217).

Such a process is continuously and repeatedly performed during the washing or rinsing operation.

The leakage and supercharge water sensing method of the dishwasher according to the present invention not only stops the cleaning motor but also detects leakage and supercharge water during operation, so that when leakage and supercharge phenomenon occur, it can be detected within a short time and measures can be taken accordingly.

Therefore, there is an effect that it is possible to prevent burn-out of the motor due to overheating of the washing motor, which may be caused by rotation of the washing motor in a state in which water in the tub is completely leaked by water leakage.

In addition, there is also an effect that a safety accident due to overheating of the heater, which may occur due to the heater being driven in a state where there is no water in the tub due to leakage, can be prevented.

In addition, there is also an effect of preventing safety accidents that can occur when the electric water is locked in water by detecting leakage phenomena and supercharging phenomenon at an appropriate time and taking measures.

Claims (2)

In a dishwasher equipped with a motor, a step of sensing the level of water in the course of the dishwasher regardless of the operating state of the motor; And controlling the motor according to the sensed level of the water level. The method of claim 1, wherein the sensing step senses a water level even when the motor is stopped.