JPS6110314Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cooking device such as a microwave oven with a heater.

Microwave ovens with heaters (also called microwave ovens) have sheathed heaters installed above and below the cooking chamber of the oven, and use radiant heat to cook the heated items. Microwave ovens with heaters (also called microwave ovens) thermostat the temperature inside the oven when the heater heats up. However, depending on the item being cooked, the temperature inside the oven is divided into a fermentation range, a medium temperature range, and a high temperature range. For example, when baking bread in a toaster oven, the temperature is set to a high temperature range.

However, in the past, although the temperatures in the fermentation zone and medium temperature zone were each controlled by dedicated thermostats, when the temperature reached the high temperature zone, the heater was used to generate heat at its maximum output without providing a thermostat. As a result, the temperature inside the oven rises to the saturation point of the heater, reaching the maximum temperature of the item being cooked, which promotes oxidation of the stainless steel that makes up the oven, causing rust and thermal discoloration of the stainless steel surface. This caused a major problem with marketability.

In view of this point, the present invention provides a cooking appliance in which cooling air is blown to a temperature detecting means for controlling the temperature in the medium temperature range, thereby controlling the temperature in the high temperature range.

Fig. 1 is an external perspective view of a microwave oven with a heater that is an embodiment of the present invention, Fig. 2 is a central vertical sectional view schematically showing its internal structure, and Fig. 3 is an electric circuit assembled therein. It is a diagram.

According to these, a door 3 that can open and close an opening of an oven 2 serving as a cooking chamber is pivotally supported on the front side of a microwave oven body 1 with a heater, and a timer knob 4, a changeover switch button 5, etc. are arranged on the right side of the door 3. An operation panel 6 is provided. An upper heater 7 and a lower heater 8 are arranged above and below inside the oven 2, and on the upper surface of the ceiling plate 9 there is a fermentation thermostat (for fermentation only) 10 and an oven thermostat (for both high temperature range and medium temperature range) 11.
is fixed and detects the temperature inside oven 2.
Inside the external body 1 of the oven 2, a high voltage transformer 12 and a blower fan 13 (not shown), which are power supplies for the magnetron, are installed. Air is blown to the fermentation thermostat 10 and oven thermostat 11 and exhausted from another vent 15.

According to the electric circuit shown in FIG. 3, a heating switch 16 is connected to one side of the AC power source 15, and a fuse 17 is connected to the other side, thereby forming an energizing path to the timer motor 4' connecting the timer knob 4. On the heating switch 16 side, there is a changeover switch 1 consisting of first, second, and third switches 18a, 18b, and 18c.
8 is connected, and an AC power source 15 is connected to the upper heater 7, the lower heater 8, and the magnetron power supply circuit 19 via this. The first switch of the changeover switch 18
The fermentation thermostat 10, which has one end connected to the Y contact of the changeover switch 18a, is connected to the third switch 18.
c and in series with the oven thermostat 11, and its connection point is connected to the y contact of the second switch 18b of the changeover switch 18.

A changeover switch 18 provided to divide the temperature inside the oven 2 into three stages is connected to the operation panel 6.
Changeover switch button 5 consisting of three buttons arranged in
When the first button for fermentation is operated, the first switch 18a is set to the Y contact, the second switch 18b is set to the X contact, and the third switch 18c is set to off. When you operate the 2nd button, the 1st
The switch 18a is the Y contact, the second switch 18
b is the x contact, the third switch 18c is set to on, and when the third button for high temperature range is operated, the first switch 18a is the x contact, the second switch 18b is the y contact, and the third switch 18c is set to on. 3 switch 18c
is set to on.

Therefore, the upper and lower heaters 7 and 8 connected in parallel can be connected to the two thermostats 1 by operating the first button.
The fermentation thermostat 10 controls the temperature inside the oven 2 to about 35°C. Furthermore, when the second button is operated, the
On the other hand, when the third button is operated, the AC power supply 15 is turned on via the x and y contacts of the first and second switches 18a and 18b and the oven thermostat 11.
The temperature inside the oven 2 is controlled by the oven thermostat 11 and adjusted to a medium temperature range and a high temperature range, respectively.

The blower motor 13' that drives the blower fan 13 has one side connected to the x contact of the first switch 18a and the other side connected to the fuse 17, and when the selector switch 18 is set to the high temperature range by operating the third button, the blower motor 13' is connected to the Connected to power supply 15.

According to the microwave oven with a heater configured as described above, the object to be heated is stored in the oven 2, the door 3 is closed, the timer is set for a predetermined time, and the heating switch button 16' of the operation panel 6 is pressed. is operated to start cooking, but for example, in order to perform toaster heating for baking bread, the third button for the high temperature range of the selector switch button 5 should be operated. . In this case, each switch 18a to 18c of the changeover switch 18 is in the state shown in FIG.
Upper and lower heaters 7 and 8 are oven thermostat 1
1. When the high temperature range is set as the temperature classification, the blower motor 13' is connected to the AC power supply 15, and thus blows cooling air to the oven thermostat 11. When the cooling air is not blown, the oven thermostat 11 is set to the fifth
As shown by the dot-dash line T ₁ in the figure, approximately 180
Since it will turn on and off at ℃, the temperature inside the oven will not rise to the high temperature range.

Now, since the oven thermostat 11 is cooled by the cooling air, it will operate on and off at a relatively higher temperature by the cooled temperature difference, and conversely, this means that the temperature inside the oven 2 is higher than the medium temperature range. For example, as shown by the solid line _T2 in FIG. 5, the temperature is adjusted to about 260°C with the same rise as in the case of temperature adjustment in the medium temperature range, and the bread is culture-cooked at this high temperature range.

Conventionally, when cooking in a high temperature range, an oven thermostat was not used, so the upper and lower heaters 7 and 8 generated heat to the saturation point, and as a result, the temperature inside the oven 2 exceeded the high temperature range, as shown by the solid line _T3 in Figure 4. The temperature had risen even further to 350 degrees Celsius.

The power supply circuit 19 of the magnetron is connected to the power supply 15 by another switch (not shown).
An object to be heated can be electronically heated.

As described above, according to the present invention, the temperature inside the oven can be adjusted to a medium temperature range or a high temperature range using the same temperature detection means, and the stainless steel that makes up the oven can be oxidized without causing the heater to generate heat to the saturation point. It is possible to provide a practical cooker that can suppress rust, heat discoloration, etc.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a microwave oven with a heater, which is an embodiment of the present invention. FIG. 2 is a central vertical sectional view showing the internal structure. Figure 3 is the electrical circuit diagram. FIG. 4 is a diagram showing the temperature characteristics inside the oven in conventional high-temperature range heating. FIG. 5 is a temperature characteristic diagram inside the oven during high-temperature range heating according to the present invention. 1: Microwave oven body with heater, 2: Oven,
7: Upper heater, 8: Lower heater, 9: Oven ceiling plate, 10: Fermentation thermostat, 11: Oven thermostat, 13: Blower fan, 1
4, 15: Vent, 18: Selector switch.

Claims (1)

[Scope of utility model registration request] In a cooking device equipped with a magnetron and a heater, and a blower fan for cooling the magnetron, temperature detection means is provided for controlling the temperature during oven medium temperature range cooking using the heater, and when the oven high temperature range cooking using the heater is set. A cooking appliance characterized in that a blower fan is configured to blow cooling air to the temperature detecting means, and the temperature detecting means controls the temperature during cooking in the high temperature range of the oven.