KR830001540Y1 - High frequency heater - Google Patents

Abstract

No content.

Description

High frequency heater

1 is an external perspective view.

2 is a schematic diagram of an internal mechanism.

3 is a configuration diagram of a control circuit.

4 is a diagram showing power consumption for various heating functions.

The present invention relates to a high frequency heating device having an oven heating function based on the heating action of the heater.

In general, in this type of high frequency heating device, for example, in a microwave oven, a range heating operation performed by supplying a high frequency generated from a high frequency generator (magnetron) into a cooking chamber, that is, cooking range, or a plurality of heaters installed in the cooking chamber. Oven heating operation, that is, even cooking the oven can be performed by the exothermic action. By the way, in such a microwave oven, only the range cooking and oven cooking are performed independently, or the range cooking and oven cooking are switched continuously, and therefore, cooking with abundant change is desired as in recent years. Under difficult circumstances, its application was difficult.

The present invention has been made in view of the above circumstances, and it is possible to add an appropriate new heating function for the purpose, thereby enabling not only the variable heating operation for the heated object but also the favorable of the heated object. It is to provide a high-frequency heating device that is extremely practical, which can achieve a completed state and can even shorten the heating time.

Next, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1 and FIG. 2, reference numeral 1 denotes a main body of a microwave oven, on which a door 2 is fixed, and an operation panel 3 is provided. In the main body 1 corresponding to the said door 2, it is arrange | positioned in the heating chamber, ie, the cooking chamber 4, and in this cooking chamber 4, the shelf 5 for placing cooked food is provided. One end of the waveguide 6 communicates with the ceiling surface of the cooking chamber 4, and a high frequency generator such as a magnetron 7 is provided on the other outer peripheral surface of the waveguide 6. The antenna 7 ₁ of the magnetron 7 is conducted in the waveguide 6, whereby the high frequency generated by the magnetron 7 is supplied into the cooking chamber 4. Moreover, in the cooking chamber 4, the upper heater (capacity 800w) 8 is provided in the upper part, and the lower heater (capacity 400w) 9 is provided in the lower part. On the other hand, in the operation panel 3, an oven cooking based on the operation of the cooking function display unit 10 serving as a plurality of light emitting units, for example, the cooking function switching lever 11 and the heaters 8 and 9 of the switch. The temperature control knob 12 for setting the air temperature in the cooking chamber 4 in the city, the timer 13 for setting the cooking time, the cooking switch 14 for starting cooking and the power switch 15 are provided. It is installed in order from the upper part to the lower part. A node mechanism (not shown) is provided in the operation panel 3 corresponding to the lever 11, and range cooking of the oscillation output 400w is performed by the left and right movement of the lever 11, Range cooking with 200W oscillation output (thaw cooking), oven cooking with upper heater 8 and lower heater 9, oven cooking with upper heater 8, oven cooking with lower heater 9 The first oven range cooking to simultaneously perform the oven cooking by the upper heater 8 and the range cooking of the oscillation output 200w, the second cooking to cook the oven cooking by the lower heater 9 and the range cooking of the oscillation output 400w simultaneously. It is possible to set each oven range cooking light. And the cooking function set by this lever 11 is made to display light emission by the corresponding display part 10. As shown in FIG.

3 is a control circuit. Reference numeral 20 denotes an alternating current power supply, at one end of which the power switch 15, the upper contact 24a ₁ of the relay 24 described later, and the upper contact 11a ₁ which responds to the lever 11, respectively. One end of the upper heater 8 is connected via a series, and the other end of the upper heater 8 is connected to the other end of the power supply 20 through an upper contact 24a ₂ of the relay 24 described later. In addition, _one end of the lower heater 9 is connected to the connection point between the upper contact point 24a ₁ and the contact 11al via the upper contact point 11a ₂ corresponding to the lever 11, and the lower heater 9 The other end of is connected to the other end of the upper heater (8).

One end of the primary winding 21 ₁ of the high voltage transformer 21 is connected to the contact point between the contact point 11a ₁ and the contact point 11a ₂ via an upper contact point 11b _{1 that} moves in response to the switch 11. The other end of the primary winding 21 ₁ is connected to the other end of the lower heater 9. The secondary winding 21 _{1 of the} transformer 21 is connected between the anode of the magnetron 7 and the cathode through a rectifying circuit as the capacitor C ₁ and the diode D. . And while the anode of the magnetron 7 is grounded, the heater is connected to the secondary winding 21 _{2 of the} transformer 21. In this case, the capacitor C ₂ is connected in parallel to the capacitor C ₁ via an upper contact 11b ₂ equivalent to the switch 11. In this way, when the contact 11b ₂ remains closed, the magnetron 7 operates at the oscillation output 400w, the contact 11b ₂ is opened, and the capacitor C ₂ is cut off to close the magnetron 7. This oscillation output is set to operate at 200w. That is, it is a condenser (C ₁ · C ₂₎ and contacts (11b _2), the output variable circuit 22 to the four magnesite torch (7) by configuration.

On the other hand, the connection point between the power switch 15 and the contact point 24a ₁ is connected to the door switch 23, the cooking switch (automatic return type upper contact point) 14 and the timer switch 13 ₁ , respectively, in series. One end of the timer 13 is connected, and the other end of the timer 13 is connected to the other end of the power source 20. A relay 24 is connected in parallel with the timer 13. The upper contact 24a ₃ of this relay 24 is connected in parallel with the cooking switch 14.

In addition, the rated power consumption of the microwave oven includes lamps (not shown) and motors for illuminating the inside of the cooking chamber 4 with the power consumption when the upper heater 8 and the lower heater 9 are operated at the same time. It is set to 1220w in consideration of the power consumption for the lamp (not shown), and also considering the current capacity in a general household.

Next, the operation in the above configuration will be described. First, operations of the contacts 11a ₁ , 11a ₂ , 11b ₁ , and 11b ₂ for various cooking functions set by the switch 11 are shown in the following table.

In this case, the symbol ○ indicates operation, and the symbol X does not operate.

The operation of the cooking function is set by the cooking function switching lever 11. The operation of the switches 11a ₁ , 11a ₂ , 11b ₁ , 11b ₂ is performed by the operation of the cooking function switching lever 11 by a switch control circuit (not shown) well known in the art, as shown in the above table. Each is executed in response.

The switches 11a ₁ , 11a ₂ , 11b ₁ , 11b ₂ are respectively connected to their positions as in FIG. 3. The planned cooking time is set by the timer 13. Under operation of the start switch 14 the relay 24 is excited to connect its contacts 24a ₁ , 24a ₂ and 24a ₃ so that the relay 24 is self-holding by the contact 24a ₃ . While maintained, the AC power is supplied from the AC power supply 20 to the high frequency generator or the high frequency power supply via the power switch 15, the contacts 24a ₁ and 24a ₂ and the switch 11b ₁ . The magnetron 7 generates a high output 400w which is in turn coupled to the cooking chamber 4 via the waveguide 6. When the cooking time ends or when the door 2 is opened, the relay 24 is deactivated, and the relay contacts 24a ₁ , 24a ₂ and 24a ₃ v are turned off. The range cooking power of the oscillating output 400w is only 800w, which is within 1220w of rated power consumption as shown in FIG.

The range cooking (low power microwave output) of the oscillation output 200w is the same as the range cooking of the oscillation output 400w except that the switch 11b ₂ goes up so that the magnetron 7 generates the low power output 200w. For range cooking with 200 watt oscillation output power consumption is much less than with range cooking with 200 watt oscillation output. (That is, 400w).

The operation of the high frequency heating device in oven cooking by the upper heater 8 and the lower heater 9 is based on resistive heating. Under this operation, oven cooking can be performed if the upper heater 8 and / or the lower heater 9 are used to heat the ambient temperature in the cooking chamber. However, if the upper heater 8 and / or the lower heater 9 are ultra low frequency generators, the operation of browning the surface of the food can be performed. In addition, one of the upper and lower heaters 8 and 9 can only be used to heat the ambient air while the other will brown the surface of the food. In some cases, under oven cooking by the upper heater 8 and the lower heater 9, the switches 11a ₁ and 11a ₂ are turned on to excite both the upper and lower heaters 8 and 9. However, the switches 11a ₁ and 11a ₂ are connected to the upper and lower heaters 8 and 9 from the AC power source 20 under oven cooking by the upper heater 8 and oven cooking by the lower heater 9, respectively. Is turned on to provide. Since the upper and lower heaters 8 and 9 are 800w and 400w, respectively, the power consumption under the oven cooking by the upper heater 8 and the lower heater 9 and under the oven cooking by the upper heater 8 is shown in FIG. As shown, it is within 1220w of rated power consumption.

In the high frequency heating apparatus, the first oven range cooking is described with reference to FIGS. 3 and 4.

The first oven range cooking is now performed. First, the power switch 15 is turned ON, the food to be cooked is placed on the shelf 5 in the cooking chamber 4, and the door 2 is closed. Then, the lever 1 is set to "first oven range cooking".

In this case, the contact 11a ₁ is closed by operation of the lever 11, and the contact 11b ₂ is opened. Then, when the time required for cooking is set to the timer 13 and the cooking switch 14 is turned ON, the timer 13 and the relay 24 are connected to the power supply 20, respectively, and the connection state thereof is the relay 24. It is held by the closing of the contact 24a ₃ based on the operation of. In addition, the upper heater 8 and the magnetron 7 operate by closing the contacts 24a ₁ and 24a ₂ based on the operation of the relay 24. In this case, since the capacitor C ₂ is cut off by the opening of the contact 11b ₂ , the magnetron 7 operates at the oscillation output 200w. In this way, the food to be cooked is heated from the surface by the heat generated by the upper heater 8, and the food to be cooked is heated from the inside by the high frequency generated by the magnetron 7. Then, when the predetermined time elapses, the timer switch 13 ₁ is opened, and the timer 13 and the relay 24 are disconnected from the power supply 20, respectively. Then, the operation of the upper heater 8 and the magnetron 7 is stopped by opening the lower points 24a ₁ and 24 ₂ based on the operation stop of the relay 24. That is, the first oven range cooking is finished.

However, the power consumption for the heater corresponds to the capacity of the heater, and the power consumption for the magnetron corresponds to about twice the oscillation output of the magnetron. Therefore, as shown in FIG. 4, the first oven range cooking consumes 800w of power for the upper heater 8, 400w of power for the magnetron 7, and its total power consumption is rated power consumption. It becomes endogenous 1200w.

In addition, when performing 2nd oven range cooking, the lever 11 is set to "2nd oven range cooking." In this case, when the time required for the operation of the lever 11 is set by the timer 13 and the cooking switch 14 is turned ON, the contacts 24a ₁ and 24a ₂ based on the operation of the relay 24 are turned on. The lower heater 9 and the magnetron 7 operate by closing. In this case, since the contact 11b ₂ maintains the closed state, the capacitor C ₂ is put in and the magnetron 7 operates at the oscillation output 400w. In this way, the food to be cooked is heated from the surface by the heat generated by the heater 7, and the food to be cooked is heated from the inside by the high frequency generated by the magnetron 7. Then, when the predetermined time elapses, the timer switch 13 ₁ is opened, and the lower heater 9 and the magnetron are opened by opening the contacts 24a ₁ and 24a ₂ based on the operation stop of the relay 24. The operation of (7) is stopped respectively.

That is, the second oven range cooking is finished.

In this second oven range cooking, the power consumption for the lower heater 9 is 400w, the power consumption for the magnetron 7 is 800w, and the total power consumption is 1200w within the rated power consumption range.

Thus, by selectively switching the operation of the upper heater 8, the operation of the lower heater 9, and the oscillation output of the magnetron 7, the oven cooking and the range cooking can be simultaneously performed within the rated power consumption. have. That is, the addition of this new oven range cooking function enables a rich cooking.

In the above embodiment, the case where two heaters in the cooking chamber 4 are provided has been described. For example, the same can be done for the case where three heaters are installed. Diverse cooking became possible. In addition, the output variable circuit for the magnetron 7 may be a switch for intermittently opening and closing the thawing motor and the energizing path to the magnetron 7 in response to the motor. In addition, this invention is not limited to the said Example, Of course, various deformation | transformation is possible in the range which does not change the summary of this invention.

As described above, according to the present invention, a plurality of heaters, high frequency generators, and output variable circuits for the high frequency generators are selectively operated within the rated power consumption. It is possible to add a function, thereby making it possible to make a heating operation rich in variability with respect to the heated object, to obtain a good state of completion of the heated object, and also to greatly shorten the heating time. This excellent high frequency heating apparatus can be provided.

Claims (1)

Heater provided in heating chamber 4, high frequency generator 7 for supplying high frequency energy into heating chamber 4, output variable circuit 22 of high frequency generator 7, and heating chamber 4 In the high frequency heating apparatus provided with (8, 9), the norwood which connects the power switch 15 and the cooking switch 14, the switch 11b ₁ , and the power switch 15 and the cooking switch 14 And a first series circuit including an upper heater and a switch 11a ₁ connected in series between and a power supply, and a second series circuit including a lower heater and a switch 11a ₂ connected in series between the nord and a power supply. And a control circuit, wherein the output variable circuit of the high frequency generator is provided with a switch (11b ₂ ).