JPS58141133A - Flooding preventing apparatus of tablewear washer - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] In conventional dishwashers, water or hot water is supplied into the tank from the water supply or water heater through a water supply solenoid valve, and if the water supply solenoid valve remains open, the water inside the machine is Water continues to be supplied, and the overflowing water wets the floor, causing so-called overflow accidents. The present invention prevents flooding accidents by operating a drainage pump,
In addition, when the dishwasher is not in operation, the load controlled by the automatic time switch does not malfunction and provides a safe dishwasher.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is a water level detection switch that detects the water level in the tank, 2 is a safety switch, and 3 is a water level detection switch that detects when the water level in the tank has reached a predetermined water level suitable for cleaning.
4 is a water supply solenoid valve that supplies water into the tank, and water level detection switch 3
controlled by 5 drains water from the tank with a drainage pump.

6 is an automatic time switch that controls processes such as water supply, washing, draining, rinsing, etc., 6a is a timer drive motor that drives this automatic time switch 6, 7 is a detergent dispenser for dispensing detergent for washing dishes, and 8 is a finishing agent dispenser for adding finishing agent in the rinsing process; 9 a heater for heating the washing water and raising the atmospheric temperature in the tank during the drying process;
1o is a cleaning motor, 11 is a capacitor for starting the cleaning motor 1o, 12 is a temperature fuse for preventing the heater 9 from overheating, 13 is a thermostat for preventing the heater 9 from overheating, and 14 is a timer drive. This is a thermostat that controls the motor 6a based on water temperature.

The contacts T1 to T8 of the automatic time switch 6 operate as shown in Fig. 2 and control the washing, rinsing, and drying programs. Fig. 3 shows the structure of the dishwasher, and 16 is the main body, 16 is the water supply A water supply hose connecting the water heater and the dishwasher; 17 a tank for storing dishes and collecting water for washing the dishes; 18 a drain pipe connecting the bottom of the tank 17 and the drain pump 6;
Reference numeral 19 denotes a drainage hose that guides water after washing and rinsing to the outside of the machine. Tap water passes through the water supply hose 16 and the water supply solenoid valve 4, and accumulates in the tank 17, where it is washed and rinsed. It passes through the drainage hose 19 and is discharged to the outside of the machine.

As shown in FIG. 1, the common terminal of the overflow level detection switch 1 is connected to the drain pump 6, the normally open contact NO is connected to the power supply, and the normally closed contact NG is connected to the timer of the automatic time switch 6. They are each connected to the drive motor 6a.

In the normal operation of the dishwasher with the above configuration, as shown in FIG. is controlled. In the unlikely event that water overflows, the overflow level detection switch 1 is switched to the NO side, and the drain pump 6 is directly connected to the power source to drain water.

Here, when the dishwasher is not in use and overflow occurs, the drain pump 6 is energized by the overflow level detection switch 1, and the automatic time switch 6 is in the 6" OFF state and the contacts T+, T2 and Since B of T6 is open, the automatic time switch 6 excludes the water supply solenoid valve 4, timer drive motor 6a, and drain pump 6 such as the detergent dispenser 7.
No power is applied to the circuit controlled by .

As described above, in the present invention, the overflow prevention operation can be performed reliably not only when the dishwasher is in use but also when the dishwasher is not in use.Furthermore, when the dishwasher is not in use, Since the contacts of the automatic time switch are open, it is safe because power does not flow into electrical parts such as the heater and cleaning motor, causing secondary failures.

[Brief explanation of drawings]

Fig. 1 is an electrical circuit diagram of a dishwasher that employs an overflow prevention circuit according to an embodiment of the present invention, Fig. 2 is a diagram showing the contact program of the automatic time switch, and Fig. 3 is a schematic configuration of the dishwasher. FIG. 1... Overflow level detection switch, 2... Old safety switch, 4... Water supply solenoid valve, 6... Drain pump, 6... Automatic time switch, 17・
...tank. Figure 1

Claims (1)

[Claims] a water supply solenoid valve that supplies water into the tank; a water level detection switch that detects when the water level in the tank has reached a predetermined position and stops the operation of the water supply solenoid valve; and a water level higher than the water level detected by the water level detection switch. Equipped with an overflow level detection switch that detects the water level and an automatic time switch that controls processes such as water supply, cleaning, and drainage, and connects the common terminal of the overflow level detection switch to the drain pump that discharges water from the tank. An overflow prevention device for a dishwasher, wherein the normally open contact of the overflow level detection switch is connected to the power supply side, and the normally closed contact is connected to the timer drive motor side of the automatic time switch.