JPS5832081Y2 - High frequency heating device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a high frequency heating device having a steam generator.

Conventionally, in this type of high-frequency heating device, for example, a microwave oven, there have been two methods: cooking by alternately generating steam and high-frequency waves in the heating chamber, that is, the cooking chamber, and cooking by continuously generating only steam in the cooking chamber. There are cases where this is done.

By the way, when such a microwave oven cooks using steam and high frequency waves, when the high frequency waves are generated, the heater that heats the water in the steam tank in the steam generator stops, and steam generation is interrupted. ing.

In addition, when cooking by continuously generating steam, the heater is stopped and the steam generator is shut off when the cooking chamber door is opened to prevent accidents such as burns. .

As described above, when the heater for heating the water in the steam tank stops, the temperature of the water in the steam tank naturally decreases, and the time required until steam is generated again becomes longer.

This leads to a drop in the temperature in the cooking chamber, making it impossible to perform optimal cooking of the food to be cooked, and
Cooking time will be longer.

This idea was made in view of the above circumstances,
The purpose of this is to shorten the time required for a high-frequency heating device that has a steam generator to start generating steam again after the generation of steam has been interrupted. The present invention provides a high-frequency heating device that also enables time reduction.

An embodiment of this invention will be described below with reference to the drawings.

In Figures 1 and 2, 1 is the microwave oven main body;
An operation panel 2 and a door 3 are provided at the front.

A heating chamber, ie, a cooking chamber 4, which is closed by the door 3, is disposed within the main body 1, and a shelf 5 on which food to be cooked is placed is provided at the bottom of the cooking chamber 4.

Furthermore, a high frequency generator such as a magnetron 6 is provided on the back side of the ceiling of the cooking chamber 4, and an antenna 6 of the magnetron 6 is led out into the cooking chamber 4.

The high frequency waves emitted from the magnetron 6 are
The stirrer fan 7 causes agitation in the cooking chamber 4.

Further, one end of a steam pipe 8 communicating with the inside of the cooking chamber 4 is connected to the upper side of the cooking chamber 4, and the other end of this steam pipe 8 is connected to a steam generator 9.

This steam generator 9 includes a steam tank 10 and a water supply pipe 11. It is separated from the water supply tank 12 which supplies water via the water supply tank 12.

In the steam tank 10, a first heating element such as an auxiliary heater 13 and a second heating element such as a main heater 1 are provided.
4 is provided.

Thus, the water in the steam tank 10 is heated by the heat generating action of the auxiliary heater 13 and the main heater 14, and is turned into steam and released into the cooking chamber 4 through the steam pipe 8. .

Figure 3 shows the main electrical circuit.

One end of the AC power source 20 is connected to one end of the auxiliary heater 13 via a power switch 21, and the auxiliary heater 13
The other end is connected to the other end of the power source 20.

The connection point between the power switch 21 and the auxiliary heater 13 is
A switch, for example switching contact 2, via a door switch 22
It is connected to the movable terminal 23C of No. 3.

The switching contact 23 responds to a time limit setting timer 24.

The fixed terminal 23b of the switching contact 23 is connected to one end of the main heater 14, and the other end of the main heater 14 is connected to the other end of the auxiliary heater 13.

Furthermore, the fixed terminal 23a of the switching contact 23 is connected to the main heater 1 via the primary winding 25□ of the high voltage transformer 25.
It is connected to the other end of 4.

The secondary winding 25.1 of the high voltage transformer 25 is connected between the anode and cathode of the magnetron 6 via a rectifier circuit formed from a capacitor C and a diode D.

Furthermore, the secondary winding 2522 of the high voltage transformer 25 is connected to the cathode of the magnetron 6.

The anode of the magnetron 6 is grounded.

Thus, when the power switch 21 and the door switch 22 are in the closed state, the main heater 14 and the magnetron 6 are selectively operated by the switching contact 23.

Next, the operation of the above configuration will be explained with reference to FIG.

First, when cooking is performed by alternately generating steam and high frequency, the cooking time S by steam and the cooking time S by high frequency
2 is set in the timer 24.

Then, the food to be cooked is placed in the cooking chamber 4, the door 3 is closed, and the power switch 21 is turned on.

Then, the auxiliary heater 13 and the main heater 14 are each connected to the power source 20, and the temperature of the water in the steam tank 10 rises due to their heat generation action.

In this case, due to the circuit configuration not shown; the timer 24
Regardless of the set time, the temperature of the water in the steam tank 10 rises to 100°C.

In this way, the water in the steam tank 10 is turned into steam and released into the cooking chamber 4, and the food to be cooked is cooked using the steam.

This steam cooking is carried out at 51
Time will be carried out.

Thereafter, when the steam cooking time S1 has elapsed, the movable terminal 23 C-fixed terminal 2 at the switching contact 23
3 B is open, and conversely, movable terminal 23 C - fixed terminal 2
31 spaces are closed.

Then, the main heater 14 stops operating and the magnetron 6
operation is started.

That is, the food to be cooked in the cooking chamber 4 is cooked using high frequency waves.

This high-frequency cooking is performed by S
It will be held for 2 hours.

At this time, the auxiliary heater 13 continues to operate, thereby keeping the water in the steam tank 10 warm.

When the high frequency cooking time S2 elapses, the movable contact 23C-fixed contact 231 at the switching contact 23
The space between the movable contact 23 C and the fixed contact 23 B opens, and vice versa.
The gap closes.

Then, the magnetron 6 stops operating and the main heater 14
operation is started.

In this case, since the water in the steam tank 10 was kept warm by the auxiliary heater 13 during high-frequency cooking, the temperature of the water in the steam tank 10 reached 100° C. in a short time.

In this way, as shown by the hatched area in the figure, cooking by steam starts within a short time, and it reaches t.

Time will be carried out. By the way, Fig. 5 shows the conventional operation for reference, but this Fig. 5 and Fig. 4
As is clear from the comparison with the figure, the time required from high frequency cooking to steam cooking is significantly shortened in the present invention.

Further, according to the present invention, the actual steam cooking time t.

is very close to the preset time t1, which shortens the overall cooking time.

On the other hand, when cooking by continuously generating only steam,
The timer 24 is not operated.

At this time, the switching contact 23 maintains the closed state between the movable terminal 23C and the fixed terminal 23B.

Then, the food to be cooked is placed in the cooking chamber 4, the door 3 is closed, and the power switch 21 is turned on.

Then, the auxiliary heater 13 and the main heater 14 are connected to the power supply 20.
is connected to the steam tank 10 due to its heat generation effect.
The temperature of the water inside increases.

In this way, the temperature of the water in the steam tank 10 is 100°C.
Then, the water becomes steam and is released into the cooking chamber 4.
Steam cooking is performed on the food to be cooked.

For example, when a cook opens the door 3, the main heater 14 is disconnected from the power source 20 and the steam tank 1 is disconnected.
The temperature of the water in the cooking chamber 4 decreases and no steam is released into the cooking chamber 4.

This prevents accidents such as burns to the cook.

By the way, at this time, the auxiliary heater 13 continues to operate, and the temperature of the water in the steam tank 10 is maintained.

Therefore, when the door 3 is closed, the steam tank 10
The water inside will reach a temperature of 100°C in a short time, and steam cooking will resume immediately.

Such an operation is also applicable during cooking with steam when cooking is performed by alternately generating steam and high frequency as described above.

In the above embodiment, the capacity of the auxiliary heater 13 is of course determined to be an optimal value depending on the capacity of the water in the steam tank 10, etc.

This invention is not limited to the above-mentioned embodiments, but can be modified in various ways without changing the gist of the invention.

As described above, according to this invention, in a high-frequency heating apparatus having a steam generator, the water in the steam generator is kept warm when the steam generation is interrupted by the above-described configuration, so that after the steam generation is interrupted, the water in the steam generator is kept warm. It is possible to provide a high-frequency heating device that can shorten the time required to generate steam again, thereby making it possible to optimally cook the food to be cooked and shorten the cooking time.

[Brief explanation of drawings]

Fig. 1 is an external perspective view showing an embodiment of the invention, Fig. 2 is an internal configuration diagram showing the main parts of the embodiment, and Fig. 3 is a block diagram showing the electric circuit of the main parts of the embodiment. FIG. 4 is a cooking time-water temperature characteristic diagram for explaining the operation of the same embodiment, and FIG. 5 is a conventional cooking time-horizontal characteristic diagram. 1...Main unit, 2...Operation panel, 3.
...Door, 4...Heating chamber (cooking room), 6
...High frequency generator (magnetron), 8...
...Steam pipe, 9 ...Steam generator, 1
0...Steam tank, 11...Water supply pipe, 12...Water supply tank, 13...
・First heating element (auxiliary heater), 14... Second heating element (main heater), 20... AC power supply, 21.
...Power switch, 22...Door switch, 23...Switch (switching contact), 24...
...Timer, 25...High voltage transformer.

Claims (1)

[Scope of utility model registration request] a heating chamber, a high-frequency generator that generates high-frequency waves within the heating chamber, a steam generator that generates steam within the heating chamber, a first heating element that constantly heats water in the steam generator, and the steam generator. A high-frequency heating device comprising: a second heating element that heats water; and a switch that selectively operates the second heating element and the high-frequency generator.