JPS6143836B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a high-frequency heating device that uses a heater for grill cooking, a heater for oven cooking, etc. as a heating source in addition to a high-frequency oscillator, and is equipped with a temperature controller to adjust the temperature in the heating chamber. It is something.

In the above-mentioned high-frequency heating device, oven cooking is done by adjusting the air temperature in the heating chamber to a temperature suitable for cooking with a temperature controller, and grilling is done by raising the upper heater installed at the top of the heating chamber to 730-800℃. Many of them use infrared energy. In this case, the temperature sensing part of the temperature controller needs to be placed at the top of the heating chamber, but the high heat of the upper heater during grilling causes the temperature controller to operate quickly, turning off the upper heater during grilling. There are things to do. As a result, the temperature of the upper heater decreases and infrared energy decreases, resulting in longer cooking times and insufficient browning.

In addition, in high-frequency heating equipment equipped with a steam generation heater in addition to oven heaters and grill heaters, in order to accurately control the temperature inside the heating chamber during steam heating, a thermosensitive temperature controller is installed in the heating chamber. may be inserted. In this case, as in the case described above, there was a drawback that when grilling food, the heat-sensitive portion directly received infrared energy, causing the grill heater to turn off prematurely.

In particular, the power of the upper heater installed at the top of the heating chamber can be changed into two levels using a diode, etc. When the power is increased, the upper heater is used as a heater for grilling food, and when the power is decreased, the upper heater is used as a grill heater. When using it as a heater for oven cooking in combination with the lower heater installed at the bottom of the heating chamber,
The upper heater is more likely to burn out prematurely during grilling.

An object of the present invention is to provide a high-frequency heating device that appropriately adjusts the temperature in the heating chamber during oven cooking or steam cooking, and is equipped with a means for preventing a heater for grilling from prematurely turning off. be.

The high frequency heating device of the present invention will be explained with reference to the drawings.

FIG. 1 is a sectional view of essential parts of an embodiment of the high-frequency heating device of the present invention. Reference numeral 1 denotes a high frequency oscillator that supplies high frequency energy into the heating chamber 3 through a waveguide 2. 4 is a blower for dissipating heat due to its own losses when the high frequency oscillator is operating. Reference numeral 5 denotes an upper heater provided at the upper part of the heating chamber 3, and the electric power can be switched in two stages, large and small. When the power of the upper heater 5 is increased, the amount of infrared energy emitted increases, making it suitable for grilled food. When the power of the upper heater 5 is reduced, it is used simultaneously with the lower heater 6 to perform oven cooking. 7 is a steam heater attached to the steam generator 8. Reference numeral 9 denotes a heat-sensitive element connected to a temperature regulator main body that regulates the temperature inside the heating chamber 3. 10 is a saucer on which food 11 is placed.

FIG. 2 is a circuit diagram showing connections of electrical parts corresponding to FIG. 1. Although there are various ways to connect electrical components, this is an example for explaining the gist of the present invention. 12 is a heating changeover switch for selecting either high frequency heating or heater heating. Heater heating includes an upper heater 5, a lower heater 6, a steam heater 7, and a combination of these heaters, and a heater changeover switch is used to switch among these heaters 5, 6, and 7. Heating switch 1
When the contact 2 is closed to the contact a side, a commercial frequency voltage is applied to the high frequency drive circuit 1a that drives the high frequency oscillator 1. At this time, the switch 14 connected in series to the blower 4 is also closed, so that the blower 4 also rotates. The heating changeover switch 12 and the switch 14 are interlocked by a cam or the like. When the heating selector switch 12 is closed to the contact b side, the commercial frequency voltage is applied to the heater selector switch 1.
3 and a switch g of the temperature regulator 15 to at least one of the heaters 5, 6, and 7. That is, when only the switch c is closed, the steam heater 7 generates heat and steam cooking can be performed. When only switches d and e are closed, oven cooking can be performed using the lower heater 6 and the upper heater 5 whose power is reduced by half by the diode 16. switch e
When only and f are closed, the upper heater 5 is directly applied with a commercial frequency voltage, generates heat with a large amount of electric power, emits a large amount of infrared energy, and can grill food. Reference numeral 17 is a blower drive switch that is closed only when grilling food, and connects the blower 4 and the upper heater 5 in parallel. Second
The connections shown are for grilling.

Next, the operation and effect of the high frequency heating device of the present invention will be explained. During high frequency heating, the food 11 is dielectrically heated independently of the temperature controller 15, but the heating chamber 3
The air inside is not heated by high frequencies. During steam heating, the inside of the heating chamber 3 is filled with steam, and the temperature inside the heating chamber 3 is adjusted by the temperature controller 15 so as to be suitable for steam cooking. During heating by the upper and lower heaters 5 and 6, the air inside the heating chamber 3 is heated, and the temperature controller 15 is adjusted to a temperature suitable for oven cooking.
Adjusted by. When only the upper heater 5 is used for heating, infrared energy can be used to grill food. At this time, the blower 4 rotates and the outer periphery of the heating chamber 3 is cooled, so the heat-sensitive element 9 provided near the peripheral wall of the heating chamber 3 is also cooled. Ru. Therefore, the energization rate of the upper heater 5 increases, the infrared energy emission time becomes longer, and it is possible to prevent the upper heater 5 from being turned off by the temperature regulator 15 prematurely before the food 11 is sufficiently browned. Of course, when grilling, it is necessary to set the temperature scale of the temperature controller 15 to the highest setting. In the case of steam cooking or oven cooking, the food 11 in the heating chamber 3 is heated by the ambient temperature, but in these cases, the blower 4 is not rotating, so the thermal energy in the heating chamber 3 is transferred to the heating chamber 3. The rate of dissipation to the outside through the surrounding wall is small. Therefore, it is possible to cook with heat efficiency.

As described above, according to the present invention, during steam cooking and oven cooking, the blower 4 for cooling the high frequency oscillator 1 is stopped to improve thermal efficiency, and
High-frequency heating that rotates the blower 4 when grilling food, prevents the temperature regulator 15 from turning off the upper grill heater 5 prematurely, increases the amount of infrared energy emitted, and achieves sufficient browning in a short time. Provide equipment.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts showing an embodiment of the high-frequency heating device of the present invention, and FIG. 2 is a circuit diagram showing connections of electrical components corresponding to FIG. 1. 1...High frequency oscillator, 3...Heating chamber, 4...Blower, 5...Upper heater, 6...Lower heater, 7...
Steam heater, 8... Steam generator, 15...
…air conditioner.

Claims (1)

[Scope of Claims] 1. A high-frequency oscillator that supplies high-frequency energy into a heating chamber, and an upper heater with variable power provided at the top of the heating chamber, and connected to a heat-sensitive element provided near a peripheral wall of the heating chamber. A high frequency device that adjusts the air temperature in the heating chamber using a temperature controller, characterized in that when grilling is performed using the upper heater, the outer periphery of the heating chamber is cooled by a blower for cooling the high frequency oscillator. heating device. 2 In claim 1, the variable-power upper heater is an element of a heat source consisting of a lower heater and a steam heater for a steam generator provided at the lower part of the heating chamber, and the lower heater and the steam heater are not included. A high-frequency heating device that is characterized by having maximum power only when in use.