JPS63315009A - Electric pot - 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 (Industrial Application Field) The present invention relates to a boiling type electric kettle that once boils water and then keeps it warm at a predetermined temperature. In the electric pot for seeds, the heat retention temperature is set in advance to a constant temperature, and is generally set at 92 to 94°C, which is considerably lower than 100°C. This is because water boils at a temperature lower than 100°C when used at high altitudes with low atmospheric pressure, and if the insulating temperature is set too high, there is a risk of continuous boiling, which could lead to a dangerous situation. In order to avoid such a risk, the temperature is set at a relatively low temperature of 92 to 94°C.0 (Problem to be solved by the invention) When in use, there were complaints that the heat retention temperature was low, and there was also the problem that it took a long time to boil again.

However, the present invention provides an electric pot that can solve the above problems.

(Means for Solving the Problems) The present invention is an electric kettle that once boils water and then keeps it warm at a predetermined temperature.The present invention detects the temperature of the water at the time of boiling, and adjusts the keeping temperature based on this water temperature. The difference between the boiling temperature and the keeping temperature must be set to an appropriate value in advance.

(Function) Therefore, if the difference between the boiling temperature and the insulating temperature is determined to be, for example, 2°C, in a general area where the water temperature at boiling is 100°C, the temperature will be 9°C.
In the highlands where the temperature is kept at 8℃ and boils at 98℃, for example, 9
0 to be kept warm at 6°C (Example) The embodiment of the present invention shown in the drawings will be explained in detail below. First, in Fig. 2, 1 is an AC power supply, and 2 is both terminals of the power supply 1. A water heater is connected in between through a relay contact 3, 4 is a heat-retaining heater that is connected in series between both terminals of an AC power source 1 through a relay contact 5 and an overheat prevention thermostat 6, and 7 is mainly composed of a microcomputer. 8 is a temperature sensing element such as a thermistor that senses the water temperature;
9 is a temperature detection circuit; 10 is a mode display unit; 0 The above-mentioned microcomputer has a CPU'U, RAM,
It is composed of a ROM, an electronic timer, etc., and controls the water boiling heater 2, the warming heater 4, etc. based on the water temperature signal inputted from the temperature sensing element 8 via the temperature detection circuit 9.

Next, the control will be explained according to the flowchart shown in FIG.

Now, when you fill the electric kettle with water and turn on the power, the relay contact 3 is turned on, energizing the water heater 2, and the water boiling operation starts. During the water boiling operation, the water temperature T is read every time a certain period of time t elapses, changes in the water temperature are repeatedly observed, and when the change in water temperature becomes zero, it is determined that the water has reached a boiling state.

Then, while setting the warming temperature T1 based on the water temperature T at this time, the relay contact 3 is turned off to stop supplying electricity to the water boiling heater 2, and the water boiling operation is shifted to the warming operation.

The above-mentioned heat retention temperature TI is obtained by subtracting a predetermined value (for example, 2°C) from the water temperature T at the time of boiling, and if the water temperature T at the time of boiling is 100°C, 9 as shown in the third figure.
It becomes 8°C, and if it is 98°C, it becomes 96°C.

During the heat retention operation, the hot water temperature T is sequentially detected, and the detected hot water temperature T and the heat retention temperature Tr are compared.Based on the comparison result, the relay contact 5 is turned ON, 0FFL, and the power to the heat retention heater 4 is turned on. By controlling the temperature, the hot water is kept at the heat retention temperature T1.

Furthermore, it is desirable that the difference between the water temperature at boiling and the insulating temperature be within the range of 2 to 6 degrees Celsius. During use, the heat retention temperature can be raised higher than before, eliminating the dissatisfaction of low heat retention temperature, and of course, it does not cause the dangerous situation of boiling when used at high altitudes with low atmospheric pressure, and it also prevents re-boiling. It can shorten the time required for

[Brief explanation of the drawing]

Fig. 1 is a control flowchart of an electric kettle according to an embodiment of the present invention, Fig. 2 is an electric circuit diagram thereof, and Fig. 3 is a diagram showing changes in hot water temperature.07: electronic control circuit section, 8: temperature Sensing element.

Claims (1)

[Claims] 1. An electric kettle that once boils water and then keeps it warm at a predetermined temperature, which is characterized by detecting the temperature of the water at the time of boiling and setting the keeping temperature based on this water temperature.