JPH019356Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an electric cooker that can improve temperature distribution characteristics.

[Technical background of the invention]

Conventionally, in the case of an electric cooker such as a hot plate, for example, as shown in FIG. A second heater 3 extends outside the first heater 2 and heats the entire cooking surface 1.
and a temperature regulator 4 that controls energization of these heaters 2 and 3. FIGS. 7 and 9 show different circuit configurations for the first and second heaters 2 and 3, in which 5 is a changeover switch and 6 is a thermostat.

The changeover switch 5 in FIG. 7 determines whether or not to energize the second heater 3. By closing this switch 5, the first and second heaters 2 and 3 can be energized simultaneously, and by opening the switch 5, the first and second heaters 2 and 3 can be energized simultaneously. Only one heater 2 can be energized. moreover,
The changeover switch 5 in FIG. 9 is used to select whether to energize the first heater 2 or the second heater 3. When the entire cooking surface 1 is heated, only the second heater 3 is heated half-way. Sometimes it is configured to heat only the first heater 2.

[Problems with background technology]

The circuit configuration shown in FIG. 7 has the disadvantage that the temperature distribution characteristics during heating over the entire surface are non-uniform, as shown in FIG. 8. That is, the temperature distribution on line A in FIG. 6 is a solid line a, and the center point is much higher than the temperature distribution b on line B.

In addition, in the circuit configuration shown in FIG. 9, the non-uniformity of the temperature distribution characteristics described above is improved, but on the other hand, as shown in FIG. When the entire surface is heated, the first heater 2 is not heated, and heat conduction to the heat-sensitive rod is only from the second heater 3, so the heat conduction characteristics thereof are significantly deteriorated.

Therefore, (1) thermostat 6 is turned OFF first after power supply starts.
The difference t ₁ between the temperature at which the temperature changes and the temperature at stability becomes large,
The time T ₁ required for stabilization also becomes longer.

(2) Also, when the temperature is stable, turn on thermostat 6,
The temperature difference T ₂ due to OFF also increases.

(3) Furthermore, after the temperature has stabilized, it has various drawbacks, such as the time T ₂ it takes to reach the initial stable temperature again after applying a load.

[Purpose of invention]

The present invention has been made to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide an electric cooker that can improve temperature distribution characteristics, temperature characteristics during stability, load responsiveness, etc.

[Summary of the idea]

an appliance main body having a cooking surface; a first heater attached to the main body to heat a part of the cooking surface;
A second heater that extends outside the first heater and heats the remainder of the cooking surface, and a temperature regulator built into a changeover switch that controls energization of the first and second heaters. , the second heater has a non-heat generating portion in a portion that overlaps with the first heater.

[Example of idea]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be explained below with reference to embodiments with reference to FIGS. 1 to 5. Reference numeral 10 denotes a hot plate appliance body having a rectangular cooking surface 11, and a first sheathed heater 12 and a second sheathed heater 13 are attached to the cooking surface 11. 14 is the first and second sheathed heater 1
A changeover switch 15 and a thermostat 1 are connected to each terminal of 2 and 13 to control the energization of these terminals.
This is a temperature regulator with 6 built-in. first heater 1
2 has one end connected to one end of the power supply through the intervention of the thermostat 16, and the other end directly connected to the other end of the power supply, and the middle part is bent into a U-shape and is approximately half of the cooking surface 11. It is arranged to be able to heat a range of . The second heater 13 has one end connected to one end of the power source via a changeover switch 15 and a thermostat 16, the other end directly connected to the other end of the power source, and an intermediate portion extending outside the first heater 12. Similarly, it is curved in a U-shape and is arranged so that the remaining portion of the cooking surface 11 can be heated. The extended portion of the second heater 13 where it overlaps with the first heater 12 constitutes a non-heat generating portion 17 made of a conductive material such as stainless steel. 18 is a heat-sensitive rod of the temperature controller 14;

Next, we will discuss the effect. First, when heating the entire cooking surface 11, it is sufficient to close the thermostat 16 and the changeover switch 15 and energize the first heater 12 and the second heater 13 at the same time. That is, since the second heater 13 is provided with the non-heat generating part 17, the surface power density on the left and right sides of the cooking surface 11 is made uniform, so that the temperature on the lines A and B in FIG. 1 as shown in FIG. Distribution characteristics can be made almost uniform. In addition, since the second heater 13 is also heated when the entire surface is heated, the thermal conductivity to the heat-sensitive rod 18 is good, and compared to the conventional FIG. Characteristics, temperature characteristics after stabilization, load response, etc. can be improved. Further, when using the cooking device with a small number of people, or when heating half of the cooking surface 11 and using the other half for keeping warm or cooking at a low temperature, it is sufficient to open the changeover switch 15 and close only the thermostat 16.

[Effect of idea]

As described in detail above, the present invention includes a main body having a cooking surface, a first heater attached to the main body to heat a part of the cooking surface, and a device extending outside the first heater for cooking. The device is equipped with a second heater that heats the remaining part of the surface, and a temperature regulator built into a changeover switch that controls energization of the first and second heaters, wherein the second heater overlaps with the first heater. Since the electric cooking device is characterized in that the contacting portion is a non-heat generating portion, the surface power density of the cooking surface can be made uniform, and the temperature distribution characteristics when heating the entire surface can be improved. In addition, due to the presence of a non-heat generating part, when the entire surface is heated, the first
Since the heater is heated, the heat conductivity to the heat-sensitive rod is good, which improves various characteristics such as characteristics when the dry temperature rises, temperature characteristics after stabilization, and load response. has advantages.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an electric cooker showing an embodiment of the present invention, Fig. 2 is an enlarged plan view of the heater section, Fig. 3 is an electric circuit diagram, Fig. 4 is a temperature distribution diagram, and Fig. 5 is FIGS. 6 to 10 are curve diagrams showing temperature characteristics.
The figure shows a conventional example, Figure 6 is a plan view showing the arrangement of the heater section, Figure 7 is an electric circuit diagram, Figure 8 is a temperature distribution state diagram, Figure 9 is another electric circuit diagram, Figure 10 is a diagram showing the state of temperature distribution. The figure is a curve diagram showing temperature characteristics. 10... Appliance body, 11... Cooking surface, 12...
First heater, 13... Second heater, 14...
Temperature regulator, 15...Switch switch, 17...
...Non-heating section.

Claims (1)

[Scope of utility model registration request] an appliance main body having a cooking surface; a first heater attached to the main body to heat a portion of the cooking surface; and a first heater extending outside the first heater to heat the remainder of the cooking surface. 2 heaters and a temperature regulator built into a changeover switch that controls energization of the first and second heaters, the second heater has a portion that overlaps with the first heater as a non-heat generating portion. An electric cooker characterized by: