JPS6142316Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of 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.

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 heat-sensitive element of the temperature regulator must be placed at the top of the heating chamber, but the high heat of the upper heater during grilling causes the temperature regulator to operate quickly, causing the upper heater to turn off during grilling. Sometimes. As a result, the temperature of the upper heater drops and the infrared energy decreases, resulting in longer cooking times and insufficient browning.

In addition, in high-frequency heating devices that are 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 temperature sensor is placed near the peripheral wall of the heating chamber. A thermosensitive element of the regulator may be inserted. In this case as well, there is a drawback that when grilling food, the heat-sensitive element directly receives 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. It may also be used as a heater for oven cooking in combination with a lower heater installed at the bottom of the heating chamber.
With this method, the upper heater is more likely to burn out prematurely during grilling.

The purpose 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 that is equipped with a means to prevent the 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 showing an embodiment of the high frequency heating device of the present invention. In this Figure 1, 1
transmits high frequency energy to the heating chamber 3 via the waveguide 2.
This is a high-frequency oscillator that supplies internal energy. 4 is a blower for dissipating heat generated by the high frequency oscillator. 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 for use in 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. 1
0 is a saucer on which food 11 is placed. FIG. 2 is a circuit diagram showing connections of electrical components corresponding to FIG. 1, and 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 13 switches between these heaters 5, 6, and 7. When the heating selector switch 12 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.
is applied to At this time, the switch 14 connected in series with the blower 4 is also closed to the contact a side, 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 changeover switch 12 is closed to the contact b side, the switch 14 is closed to the contact b side, and at the same time, the commercial frequency voltage is applied to the heater 5, via the heater changeover switch 13 and the switch g of the temperature regulator 15. The voltage is applied to at least one of 6 and 7. That is, when only 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.
When only switches e and f are closed, the diode 16 is short-circuited and the upper heater 5 is directly applied with commercial frequency voltage, generating heat with a large amount of power.
Emit multiple infrared energy to grill food. Reference numeral 17 denotes a drive switch for the blower 4 which is linked to the heater changeover switch 13 by a cam or the like and is closed only when grilling is being performed using the upper heater 5, so that the blower 4 and the upper heater 5 are connected in parallel. The connections shown in Figure 2 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 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 within the heating chamber 3 is heated and adjusted by the temperature controller 15 to a temperature suitable for oven cooking. 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 cools the outer periphery of the heating chamber 3, which cools the heat-sensitive element 9 provided near the peripheral wall of the heating chamber 3. be done. 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 via the peripheral wall of No. 3 is small. Therefore, it is possible to cook efficiently.

Note that if the heater changeover switch 13 is set to the grill (upper heater), the blower 4 rotates to cool the outer periphery of the heating chamber, so it can be used as described below. In other words, when food that has been cooked using high-frequency heating needs to be placed in tableware and reheated after cooking in an oven or grilling at 150 to 250°C, there is a risk of getting burned by touching the surrounding wall or door of the heating chamber 3. Therefore, it may be necessary to wait until the heating chamber 3 has cooled down. In such a case, heater selector switch 1
3 is the upper heater 5, and the temperature controller 15 is set to 30 to 40℃.
If the settings are set as follows, the upper heater 5 will not be energized and only the blower 4 will rotate, so the heating chamber 3 will be turned on by the blower 4.
The temperature of the heating chamber 3 can be lowered in a short time to a temperature that does not cause burns even if reheated by high-frequency heating. Further, even after steam cooking at about 100°C, the inside of the heating chamber 3 can be cooled in the same manner as described above, and the next operation such as reheating using high frequency heating can be carried out in a short time.

As described above, according to the present invention, by interlocking the heater changeover switch 13 and the drive switch 17 of the blower 4 for cooling the high-frequency oscillator, the blower 4 is stopped during steam cooking or oven cooking to improve thermal efficiency. In addition, the blower 4 is rotated only when grilling food using the upper heater 5, increasing the energization rate of the upper heater 5, preventing premature burnout, and achieving sufficient browning in a short time, making the high-frequency heating device easy to use. I will provide a.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of the high-frequency heating device of the present invention, and FIG. 2 is a circuit diagram showing connections of electrical parts corresponding to FIG. 1. 1...High frequency oscillator, 3...Heating chamber, 4...Blower, 5...Upper heater, 6...Lower heater, 13...
... Heater selector switch, 15 ... Temperature controller, 1
7... Drive switch for blower 4.

Claims (1)

[Scope of utility model registration request] A high frequency oscillator 1a, a heater heat source such as an upper heater 5 and a lower heater 6 provided above and below the heating chamber, and a heat sensitive element 9 disposed near the peripheral wall of the heating chamber in order to adjust the temperature in the heating chamber when heating the heater. A heating selector switch 12 that selects either the high frequency oscillator 1a or the heater heating source, and a heating source such as the upper heater 5 and the lower heater 6. A heater selection switch 13 that selects at least one heater and switches its power to the maximum side when only the upper heater 6 is selected; and a blower that operates in conjunction with the heater selection switch 13 only when the upper heater 5 is selected. When the high frequency oscillator 1a is selected by the heating changeover switch 12, the blower 4 is switched to the drive switch 17 for rotating the blower 4, and when the heater heating source is selected, A high-frequency heating device characterized in that a switch 14 is provided which switches to the drive switch 17 side in conjunction with the drive switch 17 when the drive switch 17 is turned on.