JPS63146376A - Electric hot plate - 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 Field of the Invention The present invention relates to an electric hot plate for general household use.

BACKGROUND ART Conventionally, this type of electric hot plate has a heater embedded inside a cooking plate on which food is placed, and a temperature detection means for detecting the temperature of the cooking plate installed in the center of the back surface of the cooking plate. and control means for energizing the heater when the temperature detected by the means falls below a predetermined temperature.

Problems to be Solved by the Invention In the above-mentioned conventional configuration, the temperature detection means for detecting the temperature of the cooking plate detects the average temperature of the entire cooking plate, and detects the average temperature of the cooking plate at the center of the cooking plate which is most frequently used. It was placed in the center of the back of the cooking plate, away from the heater, to quickly detect the temperature. As a result, the temperature of the cooking plate near where the heater is buried is actually higher than the temperature detected by the temperature detection means, and the food above the heater of the cooking plate may burn or burn. There was an inconvenience that the fluorine film applied to the surface of the cooking plate to prevent sticking was broken down.

The present invention solves the above-mentioned conventional problems, and aims to provide an electric hot plate that maintains a uniform surface temperature of the cooking plate and is easy to use and has excellent product reliability.

Means for Solving the Problems In order to achieve the above object, the electric hot plate of the present invention includes a cooking plate on which food is placed, a heater embedded in the cooking plate, and a heater disposed in the center of the back surface of the cooking plate. a first temperature detection means for detecting the temperature of the cooking plate; a second temperature detection means for detecting the temperature of the cooking plate; and control means for controlling energization to the temperature, wherein the first temperature detection means detects a temperature lower than the first set temperature, and the second temperature detection means detects a temperature lower than the first set temperature. The second temperature is higher
The heater is configured to be energized when a temperature lower than the set temperature is detected.

Effect With the above configuration, the first temperature detection means detects the temperature at the center of the back surface of the cooking plate, and when the food is placed on the cooking plate, the temperature at the center of the cooking plate changes to the first temperature. When the temperature drops below the set temperature, the control means starts energizing the heater to heat the cooking plate based on the output of the first temperature detection means. On the other hand, the second
．． The temperature detection means detects the temperature near the bottom of the cooking plate where the heater is buried, and when the temperature near the bottom of the cooking plate where the heater is buried becomes higher than the second set temperature, the heater is turned off. Cut off the power to. As a result, the surface temperature of the cooking plate is set between the set temperature of sketch 1 and the second set temperature, thereby preventing the fluorine coating on the surface of the cooking plate from being destroyed.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is a sectional view of an electric hot plate showing an embodiment of the present invention.

In the figure, reference numeral 1 denotes a cooking plate made of aluminum or the like, the surface of which is coated with fluorine, on which grilled foods and the like are cooked. A heater 2 for heating the cooking plate 1 is embedded within the cooking plate 1. The first temperature detection means 3 detects the temperature of the center part of the cooking plate 1 which is most frequently used.
A thermistor is arranged at the center of the back surface of the cooking plate 1. The second temperature detection means 4, which detects the temperature near the heater where the temperature is highest in the cooking plate 1, is made of a thermistor and is disposed at the lower part of the cooking plate 1 near where the heater 2 is embedded. ing. Reference numeral 6 denotes a control means, in which the temperature detected by the first temperature detection means 3 is lower than the first set temperature, and the temperature detected by the second temperature detection means 4 is lower than the second set temperature. This causes the heater 2 to be energized.

FIG. 2 is an electrical circuit diagram of an electric hot plate showing one embodiment of the present invention. The first temperature detection means 3 is similar to a thermistor and has a resistance value that changes depending on the temperature at the center of the back surface of the cooking plate 1; The resistance value changes depending on the temperature of the portion of the cooking plate 1 near where the heater 2 is embedded. The control means 5 is a temperature detection resistor 8a.

6b, reference voltage generation resistors 7a, 7b, first voltage comparator 8, second voltage comparator 9, AND gate 1Q, and relay 11. 1
The voltage v1 divided by the temperature detection means 3 and the temperature detection resistor 6a is compared with the first reference voltage 2 generated by the reference voltage generation resistors 7a, 7b, and 7c, and when v2>vl, Outputs an H level signal. The second voltage comparator 9 receives the voltage v3 divided by the second temperature detecting means 4 and the temperature detecting resistor 6b, and the second reference voltage v4 generated by the reference voltage generating resistor. When v4>3, an H level signal is output. Then, only when the first voltage comparator 8 and the second voltage comparator 9 simultaneously output H level signals, the AND gate 1o is turned on, driving the relay 11 and energizing the heater 2.

According to the above embodiment, when the temperature at the center of the cooking plate 1 is lower than the first set temperature and the temperature of the cooking plate 1 near where the heater 2 is embedded becomes lower than the second set temperature, When the heater 2 is energized and the first temperature detection means 3 detects a temperature higher than the first set temperature, or the second temperature detection means 4 detects a temperature higher than the second set temperature. When detected, or when both occur simultaneously, the power supply to the heater 2 is cut off. Therefore, the temperature of the cooking plate 1 is maintained between the first set temperature and the second set temperature.

As a result, it is possible to maintain the temperature of the cooking plate 1 below a temperature that would destroy the fluorine coating. Furthermore, since the temperature can be controlled over the entire cooking plate 1, problems such as over-burning of food depending on the position on which the food is placed will not occur.

In particular, in the case of an electric hot plate with a large cooking plate 1 for use by a large number of people, the effect of this embodiment is great because the heater 2 is disposed at a position away from the center of the cooking plate 1.

In this embodiment, a thermistor was used as the temperature detection means, but the same effect can be achieved even if a bimetal or the like is used.Advantages of the InventionAs is clear from the description of the above embodiments, the present invention has three advantages. For example, when the temperature of the cooking plate drops, such as when food is placed on the cooking plate, the first temperature sensing means located at the center of the back side of the cooking plate heats the cooking plate by energizing the heater, and the temperature increases again. If the temperature rises too much above the set temperature, the current to the heater is cut off, allowing highly accurate temperature control without burning the material. Then, a second temperature detection means near the heater detects the temperature of the area near the heater, and the heater is controlled based on the output of the second temperature detection means, so that the cooking plate becomes abnormal due to the heat of the heater. This prevents the fluorine coating on the cooking plate from being destroyed by heating, and prevents the food being cooked from burning or sticking, making it comfortable to use. especially.

In a large electric food plate having a large cooking plate shape, the heater is located at a distance from the center of the cooking plate where the first temperature detection means is provided, so the effects of the present invention are not as great. be.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an electric hot plate according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of the electric hot plate. 1...Cooking plate, 2...Heater,
3...First temperature detection means, 4...Second temperature detection means, 6...Control means. Name of agent: Patent attorney Toshio Nakao and 1 other person! −
1st theory, filate 2- heater 3- 1st UkL Hayaguchi hand

Claims (1)

[Claims] a cooking plate on which food is placed; a heater embedded in the cooking plate; a first temperature detection means disposed at the center of the back surface of the cooking plate for detecting the temperature of the cooking plate; A second device disposed near the bottom of the heater and configured to detect the temperature of the cooking plate.
temperature detection means, and control means for controlling energization to the heater, and the control means is configured such that the first temperature detection means detects a temperature lower than the first set temperature and the second temperature detection means detects a temperature lower than the first set temperature. An electric hot plate configured to energize the heater when a temperature detection means detects a temperature higher than a first set temperature and lower than a second set temperature.