JP2995954B2 - Microwave heating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave heating apparatus for thawing a thaw stored in a cooking chamber with a microwave generator.

[0002]

2. Description of the Related Art Conventionally, this type of microwave heating apparatus has
The thawing material stored in the cooking room was heated by a microwave generator and thawed. Hereinafter, description will be made with reference to FIG.

In FIG. 4, a cooking chamber 2 is provided in a main body 1. A microwave generator 3 and a waveguide 4 for supplying the radiated microwave into the cooking chamber 2 are provided on the right outside of the cooking chamber 2. An electrical component (not shown) is provided in a room where the microwave generator 3 is located, that is, an electrical equipment room 5 between the main body 1 and the cooking chamber 2, and further includes a microwave generator 3 and a second electrical component for cooling the electrical equipment. One blower 6 is provided. The electrical equipment room 5 also has a first air inlet 7 as an air inlet of the first blower 6, a duct 8 for introducing a part of the air into the cooking chamber 2, and a first air blowing port to the cooking chamber 2. Are provided. And
On the left side of the cooking chamber 2, a ventilation outlet 10 is provided, and connected to this, a discharge duct 11 for discharging the ventilation to the outside of the main body 1.
Are arranged.

[0004]

However, in the above configuration, in the case of the thawing operation, the microwave generator 3 is used.
And the first blower 6 is operated, but the distribution of microwaves in the cooking chamber 2 varies, and furthermore, the heat cannot be thawed uniformly due to the heat conduction characteristics of the thawed product itself. Thawing, and conversely, the inside of the center sometimes became unthawed. In the case of thawing tuna for sashimi, the over-thawed portion is boiled and cannot be used for sashimi. Conversely, there is a problem that the un-thawed portion is too hard to insert the kitchen knife. Further, a part of the air blown by the first blower 6 flows into the cooking chamber 2, but since the microwave generator 3 is cooled, it becomes hot air, and when the defrosted material comes into contact with this hot air, boiling occurs. It was not good because it was promoted.

Accordingly, it is a first object of the present invention to provide a microwave heating apparatus without uneven thawing.

It is a second object of the present invention to provide a microwave heating apparatus which can select and decompress microwave thawing and outside air blowing and thawing by a blower.

In order to achieve the first object, a microwave heating apparatus according to the present invention is provided for heating a defrosted product stored in a cooking chamber and for cooling the microwave generator. First blower and cooking room
A second blower for directly blowing outside air taken in from outside to the material to be defrosted in the cooking chamber, and the microwave generation during the defrosting operation
The second blower in addition to the operation of the device and the first blower.
By operating the blower, the outside air is blown to the object to be thawed.
And a control means for defrosting while thawing .

Further, in order to achieve the second object, the present invention relates to a method for independently operating a microwave generator during a thawing operation, a combined operation of a microwave generator and a second blower, and an independent operation of a second blower. A control device capable of selectively switching between the two is provided.

[0009]

According to the present invention, since the microwave generator heats the thawing material in the cooking chamber and the second blower blows the outside air directly to the thawing material, the surface of the thawing material has a temperature higher than the outside air temperature. , And is kept almost the same as the outside air temperature. Therefore, there is no uneven temperature at the center and the corners on the surface, and no boiling occurs. In addition, thawing of the unthawed portion is promoted by heat conduction from the surface inside.

The control means may operate the microwave generator alone, use the microwave generator in combination with the second blower, and operate the second blower in accordance with the thawing conditions such as immediately after start, intermediate stage, and end stage. Switching to islanding operation and changing the ratio of heat exchange between microwave heating and outside air allows more complete thawing.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, a second air inlet 12 for sucking in outside air is provided on an upper surface of the main body 1, a second air outlet 13 is provided on an upper surface of the cooking chamber 2, and a second air blower 14 is connected therebetween. Has been established. Note that the second air outlet 13 is located at a position where it is confirmed that the air reaches the defrosted product in the cooking chamber 2. Further, the blowing capacity of the second blower 14 is set so as not to be affected by the warm air flowing into the cooking chamber 2 after the first blower 6 cools the microwave generator 3. And
In the electrical equipment room 5, only during the thawing operation, the microwave generator 3,
In addition to the first blower 6, a control means 15 for operating the second blower 14 is provided.

A case where a defrosting operation is performed in the above configuration will be described. The control means 15 activates the microwave generator 3 and the first blower 6 in a case other than the thawing operation. However, in the case of the thawing operation, the control means 15 adds the microwave generator 3 and the first blower 6 to the second blower 6. The blower 14 is also operated. Therefore, the thawed product is heated by microwaves and exchanges heat with the outside air blown by the second blower 14. On the other hand, a part of the air blown by the first blower 6 also flows into the cooking chamber 2, but the blown amount of the second blower 14 is set so as not to be greatly affected as described above. Is kept almost the same as the outside temperature, that is, the room temperature. Therefore, the temperature rises abruptly in a portion where the defrosted product exists due to the dispersion of the microwave distribution, but the rise stops and the equilibrium stops near the outside air temperature. In other parts, the temperature has conventionally been hard to rise, but rises to near the outside air temperature due to the blowing of the outside air.

According to FIG. 2, the second blower 14
3 shows the temperature characteristics of each part of the tuna in comparison with the case where the outside air is blown and the case where the outside air is not blown. Tuna weight 230
g, about 60 mm long * about 130 mm wide * about 25 mm thick.
The room temperature is 28 ° C. in summer, which is a severe condition for suppressing the cooling of boiling. 16 is the central surface temperature when no outside air is blown, 17 is the corner surface temperature when no outside air is blown, 1
8 is the central surface temperature when the outside air is blown, and 19 is the corner surface temperature when the outside air is blown. When the outside air is not blown, the corner surface temperature 17 rises sharply compared to the center surface temperature 16. When the central surface temperature 16 reaches 5 ° C. after passing through the maximum ice crystal melting zone, the corner surface temperature 17
Has reached 35 ° C. In appearance observation, boiling occurred. On the other hand, when the outside air is blown, the corner surface temperature 19 shows almost the same tendency as the center surface temperature 18. The center surface temperature 18 and the corner surface temperature 19 reach approximately 25 ° C. early and are in equilibrium. No boiling has occurred.

According to FIG. 3, the second blower 14
2 shows the cross-sectional temperature characteristics of the tuna in comparison with the case where the outside air is blown and the case where the outside air is not blown. The cross section at the center is measured by a radiation thermometer, and a measurement photograph is shown. Reference numeral 20 denotes a cross-sectional temperature when no outside air is blown, and reference numeral 21 denotes a cross-sectional temperature when outside air is blown. Section temperature 2 when no outside air is blown
At 0, the portion is not thawed and the frozen portion occupies the majority, but at the cross-sectional temperature 21 when the outside air is blown, the frozen portion is greatly reduced, and it is understood that the thawing is promoted.

As described above, the conventional problem that the corner surface of the defrosted product is boiled due to over-defrosting, and the inside of the center is not defrosted and the kitchen knife does not enter, has been solved. Further, the problem that boiling is promoted when the warm air from the first blower 6 touches the defrosted matter is solved.

Next, at the time of the thawing operation, the microwave generator is operated independently, the microwave generator is operated in combination with the second blower,
The selection switching operation of the single operation of the second blower will be described. Depending on the thawing situation, the microwave generator and second
In some cases, it is possible to perform an efficient thawing operation by combining individual single operation instead of the combined operation of the blowers. Therefore, the control means 15 can selectively switch between the standalone operation of the microwave generator, the combined operation of the microwave generator and the second blower, and the standalone operation of the second blower.

For example, since boiling does not occur immediately after the start, energy is supplied to the inside of the defrosted product by the single operation of the microwave generator 3, and boiling may occur in the intermediate stage. In this case, the second blower is operated alone to suppress the boiling and promote the thawing to the unthawed portion. As described above, since the ratio of the microwave heating and the heat exchange with the outside air is changed according to the thawing state, more complete thawing can be performed.

[0019]

As described above, according to the present invention, the second blower is provided in addition to the operation of the second blower for blowing outside air directly into the cooking chamber and the operation of the microwave generator and the first blower only during the thawing operation. Since the outside air is blown directly to the defrosted product by providing control means for operating the defrosted product, the surface of the defrosted product does not rise above the outside air temperature, and is kept almost the same as the outside air temperature. No unevenness in temperature and no boiling occurs. In addition, thawing of the unthawed portion is promoted by heat conduction from the surface inside. Therefore, it is possible to solve the problem that the corners of the defrosted product are boiled due to over-thawing, unlike the conventional case where only microwaves are used for defrosting, and the kitchen inside is not thawed and the kitchen knife is difficult to enter.

In addition, when the thawing operation is performed, a control means capable of selectively switching between the microwave generator independent operation, the combined use of the microwave generator and the second blower, and the independent operation of the second blower is provided. Immediately after the start, when there is no danger of starting, energy is supplied to the inside of the defrosted product by the single operation of the microwave generator, and in the intermediate stage where there is a risk of boiling, the combined operation is performed to suppress boiling and promote thawing of unthawed parts At the end stage, the selection is switched as in the case of the independent operation of the second blower, so that the ratio of the microwave heating and the heat exchange between the outside air and the ratio of the heat exchange with the outside air can be changed according to the thawing condition, so that the thawing can be more complete.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a microwave heating apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing the temperature characteristics of each part of a tuna in a case where outside air is blown by a microwave heating device according to an embodiment of the present invention and a case where air is not blown;

FIG. 3 is a cross-sectional temperature characteristic of a tuna in a case where outside air is blown by a microwave heating device according to an embodiment of the present invention and a case where air is not blown;

FIG. 4 is a horizontal sectional view of a conventional microwave heating apparatus.

[Explanation of symbols]

 2 Cooking room 3 Microwave generator 6 First blower 14 Second blower 15 Control means

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) H05B 6/68 310 A23B 4/07

Claims (2)

(57) [Claims] 1. A cooking chamber, a microwave generator for heating food stored in the cooking chamber, a first blower for cooling the microwave generator, and an outside of the cooking chamber
A second blower for directly blowing outside air taken in from the cooking chamber to the object to be defrosted, and also operates the second blower in addition to the operation of the microwave generator and the first blower during the defrosting operation. By blowing the outside air to the object to be thawed
A microwave heating device comprising control means for defrosting while heating. 2. The control means can selectively switch any one of an independent operation of the microwave generator, a combined operation of the microwave generator and the second blower, and an independent operation of the second blower during the thawing operation. The microwave heating device according to claim 1.