JP2000116518A - Jar and pot - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the temperature of a semiconductor switch element from rising and to dispense the attachment of a heat radiator necessary for cooling by stopping the energization to the heat insulating heater in extending the boiling in a device provided with a main heater for boiling water in a pot into a hot water and a heat insulating heater for insulating the heat of the boiled water. SOLUTION: When a voltage is fed from an AC power supply 1, a control circuit 10 closes a relay 6 and turns on a main heater 2 and a semiconductor switch element 7 respectively based on the detection temperature of a thermistor 9 so as to energize a heat insulating heater 3 and boil the water in a pot. When detecting its boiling by the thermistor 9, it turns off the relay 6 and the semiconductor switch element 7 so as to stop the energization to the both heaters 2 and 3. After that, when a boiling extension action is selected by pushing a hot water boiling switch 11 in an operation display 8, it turns off the semiconductor switch element 7 by the detection of the boiling, stop the energization to the heat insulating heater 3, and extends the boiling for a prescribed time by single energization to the main heater 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jar for keeping boiling water at a set temperature.

[0002]

2. Description of the Related Art A conventional jar pot has a main heater for boiling water in a container to make hot water, a warming heater for keeping the boiling water warm, and a control device for controlling the entire jar pot. After heating water and detecting boiling,
In the case of performing the boiling extension operation, the control was similarly performed to energize both heaters.

[0003]

However, in this conventional control, when the boiling temperature is maximized after the detection of the boiling point and the internal temperature of the product is maximized, the two heaters are similarly energized. Was. The semiconductor switch element that turns on and off the heat retaining heater generates a loss by energizing the heater and generates heat by itself. Therefore, the temperature of the semiconductor switch element is highest after the boiling detection.
In order to prevent the semiconductor switch element from being destroyed by temperature in this state, it is necessary to mount a radiator and cool down, or use a semiconductor switch element having a larger current carrying capacity for the power of the heat retaining heater. Was causing the up.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method for extending a boiling operation after detecting a boiling.
It is assumed that only the energization of the heat retention heater can be stopped.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In a jar pot provided with a main heater for boiling water in a container to make hot water, a warming heater for keeping the heated hot water, and a control device for controlling the entire jar pot, power is supplied to both heaters. When the water is heated to detect the boiling and the boiling is extended, only the energization of the heat retaining heater is stopped.

[0006] By this control, the temperature rise of the semiconductor switch element for turning on and off the heat retaining heater is greatly reduced.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block circuit diagram of a jar according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a schematic structure of the jar.

In FIG. 1, reference numeral 1 denotes a commercial power supply composed of an AC power supply, 2 denotes a main heater for boiling water, and 3 denotes a warming heater for keeping the boiled water warm. The commercial power supply 1 supplies electricity to the control device 5 via the thermal fuse 4. The control device 5 has a relay 6 for turning on and off the energization of the main heater 2.
A semiconductor switch element 7 for turning on and off a current flowing through the heat retaining heater 3, an operation display section 8 for setting the operation of a jar pot and displaying a lamp by a lamp, and a relay 6 for receiving a detection voltage of a hot water temperature by a thermistor 9. And a control circuit section 10 for controlling the entire temperature, hot water and the like via the semiconductor switch element 7.

The operation display section 8 includes a water heater switch 11 for starting re-boiler / extension of boiling water, a temperature selection switch 12 for selecting a heat retention temperature, a water heater lamp 13 for displaying a water heating state, and a high temperature lamp for displaying a heat retention temperature. 14
And an 85 ° C. lamp 15.

In FIG. 2, the control device 5 is housed in the lower part of the main body, and 16 is a cylindrical container having an open top and a bottom. The main heater 2 and the thermistor 9 are provided at the bottom for heating the water to be housed. A heat retaining heater 3 is provided around the side surface. Reference numeral 17 denotes a tapping pipe for communicating between the bottom of the container 16 and the tapping hole. Reference numeral 18 denotes a lid which supports an open portion on the upper portion of the container 16 so as to be freely opened and closed. Operation display section 8
Is provided on an upper portion which is divided from the control device 5 and is easy to operate, for example, on an upper surface of a tap hole.

Next, the operation of the circuit of this embodiment will be described.

When a voltage is supplied from the AC power supply 1, the control circuit 10 closes the relay 6 and turns on the main heater 2 based on the temperature detected by the thermistor 9, and turns on the semiconductor switch element 7 and turns on the warming heater 3. Is turned on to maximize the power of the kettle and boil the water in the container 16,
At the same time, the water heater lamp 13 in the operation display section 8 is turned on,
The selected warming temperature lamp 14 or 15 flashes.

After that, when a state of boiling is detected by the thermistor 9 and the relay 6 and the semiconductor switching element 7 are detected.
Is turned off, the power supply to both heaters is stopped, and at the same time, the water heater lamp 13 in the operation display section 8 is turned off, and the blinking warming temperature lamp 14 or 15 is turned on. Thereafter, the current flowing through the heat retaining heater 3 is turned on / off by the semiconductor switching element 7, and is used as the heat retaining electric power to maintain the hot water temperature at the selected predetermined heat retaining temperature.

When the water heater switch 11 in the operation display section 8 is pressed to select a boiling extension operation, the water heater lamp 13 blinks. In this case, when the boiling is detected, the semiconductor switch element 7 is turned off, the energization of the heat retaining heater 3 is stopped, and the boiling is extended for a certain time by the energization of the main heater 2 alone. After a certain period of time, the relay 6 is turned off to stop the energization of the main heater 2, and at the same time, the water heater lamp 13 in the operation display unit 8 is turned off, and the blinking warming temperature lamp 14 or 15 is turned on. After that, the heater 3
The current flowing through the semiconductor device is turned on and off by the semiconductor switch element 7, and is used as heat retention power to maintain the hot water temperature at the selected predetermined heat retention temperature.

[0015]

The present invention relates to a jar pot having a main heater for boiling water in a container to make hot water, a warming heater for keeping the boiled water warm, and a control device for controlling the entire jar pot. When the water is heated and the boiling is detected and then the boiling operation is extended, the control to stop the power supply to the heat retaining heater reduces the temperature rise of the semiconductor switch element, and the radiator required for cooling can be installed. It becomes unnecessary, and an inexpensive and small control device can be provided without using an element having a larger current carrying capacity for the electric power of the heat retaining heater.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of a jar pot embodying the present invention.

FIG. 2 is a sectional view showing a schematic structure of the jar pot.

[Explanation of symbols]

2 Main heater, 3 Heating heater, 5 Controller, 7 Semiconductor switch element, 11 Water heater switch.

Claims (1)

[Claims] 1. A jar pot comprising a main heater for boiling water in a container to make hot water, a warming heater for keeping the boiled water warm, and a control device for controlling the entire jar pot. When the water is heated by energizing the warming heater (3) and the boiling is detected and then the boiling is extended, the energizing of the warming heater (3) is stopped.
A jar pot characterized in that boiling is extended for a certain period of time only by the main heater (2).