JPS5913958Y2 - dishwasher - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a dishwasher.

Traditionally, most dishwashers used a sheathed heater to boil water for drying, and some were cast in aluminum or the like.

In particular, in the latter case, at the end of the cleaning cycle, in other words, at the same time as the cleaning pump stopped, the heater was turned off, so the heat capacity of the aluminum as a whole was reduced, and the temperature of the sheathed heater in particular exceeded 300'C, causing the pump to When the heater stopped, the water flow on the heater surface stopped, so the water on the heater surface sometimes boiled.

In addition, when the water runs out after the pump is stopped, the temperature on the surface of the heater becomes over 100'C, and there is a risk that the food, etc. that is being washed will be burned, and if this happens repeatedly, the heat exchange will deteriorate. Ta.

Furthermore, since there is no difference in cleaning power as long as the water temperature is above a certain level, energizing the heater more than necessary is also a waste of resources.

The purpose of the present invention is to eliminate the above-mentioned drawbacks such as a decrease in heat exchange efficiency and waste of resources.

The configuration will be explained below with reference to the circuit diagram of FIG. 1, which is shown as an embodiment of the present invention.

1 is the power supply, 2 is the heater, which is controlled by the relay contact RL.

3 is a coil which is controlled by a thermostat 4 to maintain the maximum allowable temperature.

5 is a drain motor, 6 is a water supply valve, 7 is a timer motor, and 8 is a thermostat for starting cleaning. After this thermostat is turned on, the timer motor is energized.

Reference numeral 9 designates a detergent injection unit, 10 a cleaning motor that drives a cleaning pump, and 11 a liquid level control switch.

T1 to T9 indicate time switches. FIG. 2 shows a program executed using the circuit of FIG. 1, and will be explained below starting with step C of the cleaning cycle.

The water supply valve 6 is energized by the switch T4 and water is supplied.

At a constant water level, the liquid level control switch 11 is switched to the normally open side.

The water supply is stopped, the timer motor 7 is energized by the switch T6, the detergent is supplied by the switch T7, the washing motor 10 is energized by the switch T8, and the heater 2 is energized by the switch T9.

■Start the dividing process.

At this point, the timer motor 7 stops until the thermostat 8 closes.

Once the thermostat 8 is closed, step E begins 14 minutes later.

Then, the switch T9 is opened, and the power supply to the heater 2 is stopped, so that the temperature of the heater becomes the same as the water temperature.

After one minute, the process enters step F, and the drain motor 5 is energized through T2, and the cleaning motor 10 is no longer energized.

However, since the heater surface temperature is already at the water temperature, food residue will not stick to the heater surface even after the water is drained.

As mentioned above, in this invention, the mass of the sheathed heater is increased by casting it in aluminum or the like, so that a material with a large heat capacity is installed on the suction side or the discharge side of the cleaning pump to ensure sufficient heat exchange. In this state, before draining the water at the end of the cleaning cycle, turn off the power to the heater, lower the heater surface temperature, then turn off the power to the washing motor and drain the water. The heat exchange efficiency is not changed, the heat exchange is performed sufficiently, and the heater is turned off quickly, which has the effect of saving resources.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing one embodiment of the present invention, and Fig. 2 is a circuit diagram showing an embodiment of the present invention.
Diagram program. 2...Heater, 10...Cleaning motor, T1-T9...Time switch, A-B...
...Washing cycle.

Claims (1)

[Scope of utility model registration request] A heater made of aluminum or the like and a sheathed heater,
In a dishwasher equipped with an automatic time switch, a heater set in a part of the suction side or discharge side waterway of the pump driven by the cleaning motor is energized during the cleaning cycle, and the heater is turned off before the pump stops operating. A dishwasher characterized by being provided with a control circuit that turns off the circuit and dissipates heat from the heater, then stops pump operation and drains water.