JPS6129626A - Electric cooking heater - Google Patents

Abstract

PURPOSE:To prevent a waving phenomenon in brightness in a temperature controllable electric cooking heater by a method wherein a sensor is placed at a center of a rear surface of a ceramic top plate, a heater is arranged, it is shielded by a container type thermal insulator and the calorie of the heater can be changed over. CONSTITUTION:At a rear surface of a transparent or opaque top plate 1a of ceramic family is provided with a cylindrical thermal insulator 5 having a recess part near an upper central surface, a case 6, a reflector plate 7 arranged at an upper surface of the recess in the thermal insulator 5 and a heater unit 2 composed of a sensor 3 installed at a cylindrical hollow part 9 of small diameter positioned at the center part of the thermal insulator 5 to form a glass tube lamp type heater 8. With this arrangement, the sensor 3 is contacted to the rear surface of the main body of the heater without being influenced by the convection heat of the heater 8 and so the heating condition can correctly be sensed. Further, it is possible to prevent a brightness vibrating phenomenon without complete turned-off condition of electricity for the heating during cooking operation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric stove whose temperature can be controlled and the state of red heat of the heater can be checked.

Conventional configurations and their problems In recent years, there has been a demand for electric stoves with high temperature control accuracy, but conventional electric stoves have a sensor on the back of the top plate on which cooking utensils are placed. Because it was not provided, it was difficult to perform highly accurate temperature control. In addition, with bimetal-based devices for temperature control, the brightness wave phenomenon of the lamp-type heater could be seen through the transparent or translucent top plate to turn on and off the electricity to the lamp-type heater, causing inconvenience during cooking. .

OBJECTS OF THE INVENTION The present invention solves the above-mentioned problems and provides an electric stove with high temperature control accuracy and no brightness wave phenomenon.

Structure of the Invention In order to achieve the above object, the electric stove of the present invention has a sensor disposed in the center of the back surface of a ceramic top plate, and a controller that controls the amount of heat generated by a plurality of heaters. The structure includes a means for switching the connection of the heater.

According to the above configuration, the sensor detects the temperature of the top plate, and based on the detection signal, the controller switches the connection of multiple heaters to parallel, series', series-parallel, etc., and controls the heat generation amount of the heaters. do.

DESCRIPTION OF EMBODIMENTS An electric stove in an embodiment of the present invention will be described based on the drawings.

In FIGS. 1 and 2, the electric stove of this embodiment includes a bottomless, hollow, box-shaped electric stove body 1, a heater unit part 2 consisting of a heater as a heating source and a heat insulating material, and a mounting plate. The heating apparatus includes a sensor 3 that detects the temperature of the cooking utensil, and a controller 4 that controls the amount of electricity supplied to the heater.

Top plate which is the upper part of the electric stove body 1)
1a uses a ceramic material such as crystallized transparent glass or crystallized translucent porcelain, so there is no risk of it breaking even if water is spilled or the cooking utensils are dropped during cooking.

Next, the heater unit section 2 provided on the back surface of the upper part of the electric stove body 1 includes a heat insulating material 5 which is cylindrical and has a concave portion near the center of the top surface, and a heat insulating material 5 that covers the side and bottom surfaces of the heat insulating material 5. , a reflective plate 7 made of a heat-resistant material provided on the upper surface of the recess of the heat insulating material 5, a plurality of glass tube lamp type heaters 8 arranged parallel to the upper surface of the reflective plate 7, and a center of the heat insulating material 5. A cylindrical hollow part 7 with a small diameter is provided in the hollow part 9, and a sensor 3 is provided in the hollow part 9. Since the hollow part 9 is an independent space in which the heat of the heater 8 does not convect, it is not affected by direct heat from the heater. The sensor 3 located in the hollow part 9 is pushed up by a spring so as to come into contact with the back surface of the upper part of the electric stove body 1. Further, an overtemperature rise preventer 16 is provided in which a detection section 17 is fitted in the groove 10 that crosses the heat insulating material system. The heater unit section 2 constructed as described above is brought into contact with the periphery 7 flange portion of the heat insulating material 4 through a packing 12 made of asbestos or the like so as to be in contact with the upper back surface of the electric stove main body 1. Still the heater unit part 2
The upper part 2 of the heater unit is lifted by a spring 15 via a support fitting 13 and a sliding fitting 14 provided on the bottom surface of the heater unit, so that it can come into contact with the upper back surface of the electric stove main body 1.

On the other hand, the heating control of the heaters 8 of the heater unit section 2 is performed by the controller 4, and this controller 4 connects the plurality of heaters 8 in series based on the signal detected by the sensor 3. Adjust the heating amount by switching the connection to parallel, series/parallel, etc. For example, if the supply voltage to the heaters 8 is given a constant value E, the combined resistance will be greater when the heaters 8 are connected in series than when they are connected in parallel, so the supplied power will be higher when the heaters 8 are connected in parallel. Therefore, the heating amount of the heater 8 also increases. Therefore, the connection combinations of the heaters 8 are switched, such as series or parallel, depending on the amount of heat generated.

As described above, according to the electric stove of this embodiment, the sensor 3 is provided in the hollow part 9 which is not affected by the convection heat of the heater 8, and is in contact with the upper back surface of the electric stove body 1. , it is possible to accurately detect the heating state of cooking utensils and improve temperature control accuracy. In addition, the controller 4 controls the amount of heating by switching the connection arrangement of the heater 8.
Since it can be manufactured at low cost and the heater 8 is not completely de-energized during cooking, the top plate 1a
This has the effect of preventing the brightness wave phenomenon of the lamp type heater 3 from occurring.

Effects of the Invention Since the electric stove of the present invention is provided with a sensor in the center of the back surface of the top plate, the surface temperature of the top plate,
In other words, the temperature can be detected at a value close to the temperature of the cooking utensil placed thereon, and therefore temperature control accuracy can be improved. However, since the controller does not control the heater by turning on and off the power supply, but by switching the connection of multiple heaters, it is possible to prevent the brightness wave phenomenon of the heater from occurring, and the effect is great. be.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of an electric stove according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of the electric stove. 1a...Top plate, 3...Sensor, 4...Controller.

Claims (1)

[Claims] A container-shaped heat insulating material is provided on the back side of a transparent or translucent ceramic top plate to create a space, and a plurality of heaters are arranged in that space except for the center part of the top plate. A sensor is disposed at the center of the back surface, and the controller for controlling the amount of heat generated by the heater has means for switching connections of the plurality of heaters.