JPS6340179Y2 - - Google Patents

Description

[Detailed explanation of the invention] (1) Industrial application field This invention relates to a water temperature control device for boiling electric pots.

(2) Prior Art In boiling type electric pots, it has been conventional practice to detect a boiling state based on steam temperature, etc., and then turn off the electric circuit of the water heater to shift to a warm state.

In this case, in order to obtain sufficient boiling time before transitioning to the keep-warm state after boiling, a timer is activated when the temperature reaches or is close to the boiling point, and the water heater is turned on after a certain period of time set by the timer. For example, a hot water temperature control device equipped with a delay circuit that switches off and enters a warm state is disclosed in Japanese Patent Laid-Open No. 59
-8921, No. 8922, etc.

(3) Problems to be solved by the invention The water temperature control device disclosed in the above publication operates a thermoswitch connected in series with the water heater by a thermal timer using a positive temperature coefficient thermistor element. Therefore, the on/off of the water heater is controlled only by the thermal timer. Therefore, the transition from the warm state to the boiling state is limited to after water is added or after the power is turned off, and it is not possible to artificially transition to the boiling state at any time.

(4) Means for solving the problem In order to solve the above problem, this invention connects a normally open thermoswitch of a manually set type thermal timer in series with the water heater, and connects the above thermoswitch in parallel with the water heater. It has a configuration in which a series circuit of a heating element of a thermal timer and a normally open thermoswitch for boiling detection is connected.

(5) Effect In the hot water temperature control device having the above configuration, when the thermal timer switch is closed by operating the push button of the thermal timer, the water heater is energized. As a result of boiling water, when the boiling point is reached, the boil detection thermoswitch closes and the heating element of the thermal timer is energized. As the temperature of the heating element rises, the thermal timer switch is opened after a certain period of time, cutting off the power to the water heater.

(6) Embodiment Figure 1 shows an example of a hot water temperature control circuit for a boiling type electric pot. In this circuit, 1 is a manually set type thermal timer, and this timer 1 includes a normally open thermoswitch 3 that is operated from an open state to a closed state by a manual push button 2, and a heating switch that heats the thermoswitch 3. It consists of element 4. The thermoswitch 3 and the water heater 5 are connected in series, and a series circuit of the heating element 4 and a normally open thermoswitch 6 for detecting boiling is connected in parallel with the water heater 5.

Further, a heat insulating heater 8 is connected in series with the thermal reed switch 7, and is connected to a power source 10 together with the above-mentioned circuit via a thermoswitch 9 for preventing dry cooking.

FIG. 2 shows the inner container 11 of the electric pot equipped with the above circuit, and the inner container 11 is equipped with a water heater 5, a boil detection thermoswitch 6 above the full-fill line 12, and a push button on the pot body. Thermal timers 1 with 2 are attached to each of them.

When the power source 10 is turned on with water in the inner container 11 of the electric kettle and the push button 2 is operated, the thermoswitch 3 is set and the water heater 5 is energized. Thermal reed switch 7
is turned on at an appropriate temperature before it reaches a boiling point.
It is turned off and controls the electricity supply to the heat-retaining heater 8.

In this manner, when the boiling state is reached, the steam temperature is detected, the thermoswitch 6 is closed, and the heating element 4 of the thermal timer 1 is energized. The heating element 4 heats the thermo switch 3, returns the switch 3 after a certain period of time, and turns on the water heater 5.
The circuit is turned off and the device enters the warm state.

Note that if the push button 2 is pressed after the water is kept warm or after adding water, the water returns to the boiling state and can be boiled.

(7) Effects As mentioned above, by using a manually set thermal timer, this invention allows the heater to be energized for a certain period of time from when the boiling point is reached to when the water enters the warm state. Therefore, it is possible to bring the water to a sufficient boil, and by operating the appropriate push button in the heat-retaining state, it is possible to bring the water to a boiling state again.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of the embodiment, and FIG. 2 is a schematic sectional view showing a part of the electric pot of the embodiment. 1...Manual set type thermal timer, 2...
Push button, 3...thermo switch, 4...heating element, 5...kettle heater, 6...thermo switch.

Claims (1)

[Scope of utility model registration request] A boiling type electric power system comprising a normally open thermoswitch of a manually set thermal timer connected in series with a water boiler heater, and a series circuit of a heating element of the thermal timer and a normally open thermoswitch for boil detection connected in parallel with the water heater. Pot hot water temperature control device.