KR930008374B1 - Process control of water supply for tableware cleaner - Google Patents

Abstract

The water supply control circuit comprises transistors (Q1) (Q2) for operating triacs (12)(11) by blocking or connecting according to outputs (01)(02) of a micom, water supply valve (7) for supplying or blocking water in cleaning tub by the operation of the triac (12), cleaning motor (8) for revoling a cleaning tub to clean tableware, detecting section (9) for detecting the generating voltage in the coil of cleaning motor, micro computer (10) for controlling water supply according to the output voltage of the detecting section (9).

Description

Water Supply Control Method of Dishwasher

1 is a block diagram of a general dishwasher.

2 is a water supply control circuit diagram of a conventional dishwasher.

3 is a water supply control circuit diagram of the dish washing machine of the present invention.

4 is an input waveform diagram of a microcomputer according to FIG.

5 is a flow chart of a water supply control of the dish washing machine according to the present invention.

* Explanation of symbols for main parts of the drawings

1: washing tank 2: spray nozzle

3: washing pump 4: pressure switch

5: processing compression chamber 6: air hose

7: water supply valve 8: washing motor

9 detection unit 10 microcomputer

11, 12: triac Q1, Q2: transistor

The present invention relates to water supply control of a dishwasher, and particularly, the microcomputer detects and processes a change in current caused by a load applied to a pump motor according to the amount of water supplied to the water supply valve when the change range of the current reaches a predetermined level. It relates to a water supply control method of the dishwasher by blocking the washing machine to operate optimally.

In general, in supplying water to the washing machine, when appropriate water is supplied to the washing tank by using a float switch using buoyancy or a pressure switch using head pressure, the water supply is controlled by shutting off the power supply valve. The washer is as shown in FIG.

When the water is supplied through a water supply valve (not shown) in the washing tank 1 as a configuration diagram of a general dish washer, the water is pumped by the washing pump 3 and sprayed onto the spray nozzle 2 to wash the dishes. The water level is increased at the bottom of the washing tank (1) by the water supply valve. At this time, the pressure is increased in the air compression chamber (5) installed on the bottom of the washing tank (1) to transfer the air pressure to the pressure switch (4) through the air hose (6). When the specified pressure is applied to the pressure switch 4, the internal switch switching shuts off the power supply of the water supply valve 7 as shown in FIG. 2 to increase the water supply, thereby controlling the appropriate amount of water supply for cleaning.

However, in such a conventional circuit, since the water supply is controlled by a pressure switch or a floating switch, a switch tolerance occurs due to the tolerance of the switch, so that an optimum amount of water level control is impossible, and in general, water is supplied more than the proper level. There was a problem in that the time required for heating during washing takes a lot of time and electricity.

Therefore, in order to solve the conventional problems, the present invention detects a change in the current value flowing to the washing motor according to the amount of water supplied without using a pressure switch or a floating switch, and processes it in a microcomputer to control the amount of water supplied and to supply an optimum quantity. Invented the water supply control device of the dishwasher to enable it will be described in detail by the accompanying drawings as follows.

3 is a water supply control circuit diagram of the dishwasher according to the present invention, as shown therein, a transistor for driving and cutting the triacs 12 and 11 according to the outputs 01 and 02 of the microcomputer 10. (Q1) (Q2), a water supply valve (7) for supplying and blocking water to the washing tank by driving the triac (12), and the washing tank is rotated by driving the triac (11) to wash the dish. In accordance with the washing motor (8) to enable it, the detection unit (9) for detecting the voltage generated in the coil 13 installed at its input when the washing motor (8) is driven, and according to the output voltage of the detection unit (9) The microcomputer 10 is configured to control the correct amount of water supply.

Referring to the operation and effects of the present invention configured as described above in detail.

When the dishwasher starts to operate, the triac 12 is driven because the transistor Q1 conducts as a high potential signal is applied from the output 01 of the microcomputer 10 to the base of the transistor Q1. The water supply valve 7 is opened to start water supply into the washing tank 1 as shown in FIG. Wait 30 seconds because it takes about 1 minute to start supplying water and reach the proper amount.

After 30 seconds, the microcomputer 10 outputs a high potential signal to the base of the transistor Q2 through the output 02, and when the transistor Q2 conducts and the triac 11 drives, the washing vibrator ( 8) starts driving.

At this time, when the amount of water in the washing tank (1) is less than the appropriate level, the current flowing less is applied to the washing motor (8) is less, the more the load is increased as the quantity is increased, the current also increases.

Then, when the voltage VC according to the current strength of the coil 13 is applied, the voltage VC is input from the detection unit 9 to the non-inverting input terminal (+) of the comparator OP, so as to be equal to the reference voltage VB. When compared with the reference voltage VB, the reference voltage VA is generated and applied to the input terminal F1 of the microcomputer 10 as shown in FIG.

As such, when the voltage VA is input, the output 01 is disconnected from the microcomputer 10 to cut off the power supply of the water supply valve 7 to stop the water supply, and then proceed with the next washing process.

The description of the water supply control method described above is as shown in the flowchart of FIG. 5 and if the VA voltage does not occur even after 10 minutes have elapsed after the signal is output through the output (01) If the quantity is not reached), the alarm buzzer sounds and the power of all the loads is cut off so that the microcomputer 10 is in a pause state.

Referring to FIG. 5, when the washing machine starts to operate, a signal is generated through the output (01) stage of the microcomputer (10), and after a predetermined time elapses, a signal is generated through the output (02) stage to change the current value. When the voltage is detected and input to the microcomputer 10, the microcomputer 10 disconnects the signal output through the output (01) stage so that the washing process proceeds, and the detected voltage is not detected even after a predetermined time elapses. If not, an alarm buzzer sounds to allow the microcomputer 10 to pause.

As described in detail above, the present invention has the effect of detecting the change of the current value flowing through the input stage when the washing motor is driven according to the amount of water supplied, and processing it in a microcomputer to control the water supply so as to control the amount of water accurately.

Claims (1)

Checks whether the current flowing through the coil 13 installed at the input of the washing motor is equal to or greater than the reference value, outputs the water supply stop signal when the reference value is higher than the reference value, and proceeds with the washing process. The water supply control method of the dishwasher, characterized in that the load drive is stopped by determining that the proper water supply amount is insufficient after a lapse of time.