KR910009710B1 - High friquency heating apparatus - Google Patents

Abstract

No content.

Description

High frequency heater

1 to 6 show one embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of a microwave oven which is a high frequency heating apparatus.

2 is a transverse plan view thereof.

3 is a perspective view of the cooking base plate.

4 is an enlarged longitudinal sectional view of the slit portion.

5 is an explanatory diagram of a radiation state of microwaves.

6 is a perspective view of a measuring vessel used for heating distribution measurement.

7 is a perspective view of the cooking plate showing another embodiment of the present invention.

8 and 9 are explanatory views of microwave transmission states viewed from different directions.

* Explanation of symbols for the main parts of the drawings

4: heating chamber 4c: side wall (of heating chamber)

11: high frequency heating mechanism 12: upper heater

13: lower heater 15: cooking support plate

17: slit part 6: aftershock

The present invention is equipped with a high-frequency heating mechanism in the heating chamber and at the same time equipped with a heater heater consisting of a stick-shaped heater and a cooking support plate, so-called oven range capable of performing microwave cooking with high-frequency heating and oven cooking with a heating function. The present invention relates to a high frequency heating apparatus, and more particularly, to an improvement in a heating structure when continuous range cooking and oven cooking are performed.

According to the to-be-cooked object, when cooking can be used not only with range cooking of a high frequency heating operation but also oven cooking which is a heater heating operation, a cooking state will be in the best state.

For example, it is a combination of oven cooking which burns the surface a little like gratan and hamburger steak and range cooking which heats enough to the inside.

Thus, a microwave oven of a high frequency heating device that meets the needs of such complex heating has been provided.

In this type of microwave oven, for example, a waveguide that opens an excitation opening in an upper wall of a heating chamber is connected, and a high frequency magnetron is provided in the waveguide.

The upper wall of the heating chamber has a stirrer and a high frequency heating mechanism made of a rotating plate at the bottom.

Furthermore, the heater heater was provided with a bar-shaped heater at each of the upper and lower portions of the heating chamber, and at the same time, a cooking support plate made of a metal plate was installed to place the workpiece in the middle of the heating chamber between the heaters.

In the case of range cooking, a cooking object is placed on a rotating plate and rotated, and the cooking support plate is removed to operate a high frequency heating mechanism.

When oven cooking is carried out, a cooking object is placed on a cooking stand, and a rotating dish is removed to operate a heater heating mechanism.

In this way, when the range cooking and the oven cooking are performed on the separate to-be-processed products, respectively, the respective effect is obtained, so that heating becomes uniform during each cooking, and there is no particular problem.

However, depending on the to-be-cooked object, it may switch to oven cooking soon after range cooking is performed, and it may carry out this cooking continuously.

At this time, since it is inconvenient to remove and put the cooking tray and the rotating dish every time it is used, the rotating dish is usually removed, and the cooked product is placed on the cooking stand, for example, the range cooking is performed first and then the oven cooking is performed continuously. Is done.

Naturally, this cooking procedure may be reversed.

In such continuous cooking, since an object to be cooked is originally placed on a cooking stand in order to perform heater heating, the heating state in oven cooking becomes uniform.

However, at the time of range cooking, the rotary dish is placed at the position most suitable for high frequency heating, but by using the cooking stand without using this, uniform high frequency heating action is not possible on the cooked object and the unbalanced heating state can be avoided. There was no.

If the cooking base is removed and the dishes are placed on the rotating plate as described above, the cooking is not a problem in the range cooking. However, since the lower heater is too close to the rotating plate and the upper heater is far from the rotating plate, the oven cooking It is virtually impossible.

In this regard, it is best if it is possible to ensure the heating efficiency of the heater and to improve the high frequency heating efficiency by using a device by placing the workpiece on the cooking support plate in the cooking of the range cooking and the oven cooking continuously.

The present invention prevents uneven heating grooves generated by high frequency heating by placing a heated object on a cooking support plate for heating the heater when the above-described high frequency heating and heating are performed in one cooking. It is an object of the present invention to provide a high frequency heating device that enables a high frequency heating operation without any non-uniform heating of the heated object loaded thereon by an extremely simple processing of the cooking support plate, thereby obtaining uniform heating.

That is, according to the present invention, a heater is installed on the upper and lower portions of a heating chamber equipped with a high frequency heating mechanism, and a cooking support plate made of a metal plate that loads the heating targets between these heaters is installed to continuously convert the high frequency heating action and the reversible action of the heater. It is a high frequency heating apparatus which opened the slit part used as a pair of long hole in the left and right both sides of the said cooking base plate mentioned above.

In addition, according to the present invention, a heater is installed on the upper and lower portions of a heating chamber equipped with a high frequency heating mechanism, and a cooking support plate made of a metal plate for loading the heating targets between the heaters is disposed to continuously convert the high frequency heating operation and the heating operation of the heater. In this way, the slit part which becomes a pair of long hole is opened to the left and right both sides of the above-mentioned cooking base plate, and this slit part lengthily opens in the same direction as the longitudinal direction of the excitation hole which comprises the above-mentioned high frequency heating mechanism, and its length The dimension of the direction is about 1/2 wavelength of the microwave which performs a high frequency heating action, The high frequency heating apparatus characterized by the above-mentioned.

In addition, according to the present invention, a heater is provided at the upper and lower portions of a heating chamber equipped with a high frequency heating mechanism, and a cooking support plate made of a metal plate for placing the heated object therebetween is arranged to continuously perform the high frequency heating operation and the heating operation of the heater. In order to enable the conversion, the slit part including a pair of long holes is opened in the left and right both sides of the above-described cooking base plate, and the slit part is opened in the same direction as the excitation port and the longitudinal direction constituting the aforementioned high frequency heating mechanism. The lengthwise dimension is about 1/2 wavelength of microwaves for high frequency heating, and is installed at a position separated by about 1/4 wavelength from each side wall of the heating chamber.

According to such a configuration, the microwaves emitted from the aftershocks are distributed to each slit part, and the left and right slit parts generate the same level of electric field, respectively, so that the left and right are balanced to achieve uniform high frequency heating.

EMBODIMENT OF THE INVENTION Hereinafter, one Example of this invention is described based on drawing.

As shown in Figs. 1 and 2, " 1 " in the figure is the main body of the microwave oven which is a high frequency heating device.

An opening is provided in the front side of the apparatus main body 1, and the door body 2 opens and closes freely.

On the side of the door 2, the operation board 3 provided with switches is provided.

The heating chamber 4 is housed inside the apparatus body 1 described above.

In other words, the heating chamber 4 has an opening which is opened and closed by the door body 2 described above, and the other circumferential surface is an inner container having a predetermined distance from the apparatus body 1.

One end of the waveguide 5 is mounted on the top wall 4a of the heating chamber 4 and on the rear side thereof, and the excitation opening 6 is opened on the top wall 4a.

The other end of the waveguide 5 extends toward the side wall of the apparatus body 1, to which a magnetron 7, which is a high frequency generator, is attached.

The above described excitation opening 6 is closed by an aftershock cover 8 made of a material through which microwaves are transmitted.

A motor 9 is attached to the bottom, and the rotary shaft 9a penetrates the bottom wall 4b of the heating chamber 4 to protrude in the bottom direction therein.

And the rotation plate 10 is detachably inserted and attached to the rotating shaft (9a).

This constitutes the high frequency heating mechanism 11.

On the other hand, an upper heater 12 is provided between the left and right side walls 4c of the heating chamber 4 slightly above the center in the front-back direction from the upper side of the heating chamber 4.

Similarly, at the lower side of the lower side of the heating chamber 4, slightly lower than the center of the front-back direction, the lower heater 13 is provided over the left-right side wall 4c.

That is, the upper heater 12 is located at a position away from the above-described excitation port, and the lower heater 13 is not in contact with the rotating shaft 9a of the motor 9 and the above-described rotary plate and the heating chamber 4 It is located between the bottom wall 4b.

Both side walls 4c of the heating chamber 4 respectively protrude inwardly in the middle part of the vertical direction, and the support protrusions 14 are integrally bent so that the upper surface thereof is horizontal.

In other words, the support protrusion 14 is installed along the front and rear directions, and the cooking support plate 15 can be freely supported in and out of the upper surface of the support protrusion 14.

The above-described cooking support plate 15 is a rectangular tray shape by bending the peripheral end of the metal plate, and the surface is neatly processed. Support portions 16 are integrally installed at both left and right ends thereof to support the above-described support protrusion 14. It is intended to be loaded directly into.

And the left and right both sides of the adjustment support plate 15 is provided with a slit 17 to be described later.

This constitutes the heater heating mechanism 18. Next, the slit part 17 mentioned above is demonstrated.

As shown in FIG. 3 and FIG. 4, a narrow long hole is provided inside the protrusion 17a which protrudes slightly upward and is formed by the protrusion fragment 17b which protrudes downward.

Again, as shown in FIG. 2, the slit portion 17 is provided along the same direction as the longitudinal direction of the excitation cover 8 described above, in the front-rear direction, and the longitudinal dimension thereof is approximately half (1) of the wavelength λ of the microwaves. / 2λ).

The high frequency of this kind of microwave is 2.450MH ₂ and the wavelength is about 120mm.

Therefore, 1/2 wavelength is about 60 mm, but in one embodiment it is set to 70 mm slightly longer than this.

In addition, each slit 17 is provided at a distance of about 1/4 wavelength (1/4 lambda) from each side wall 4c of the heating chamber 4.

It is about 30mm away.

Then, the first high-frequency heating mechanism 11 is operated to cook the so-called range, and then the heater heating mechanism 18 is operated to cook the so-called range, or in the case of continuous cooking to the contrary, the rotary dish 10 is removed and the cooking support plate is removed. Attach (15) and load the cooked material (R) to be heated.

When range cooking is performed in such a state, microwaves oscillated in the magnetron 7 are radiated from the excitation cover 8 into the heating chamber 4 through the waveguide 5.

And the radiation state of the microwave will be described in detail in FIG.

In the drawing, the microwave kitchen wave M ₀ oscillated into the heating chamber 4 from the above-mentioned excitation opening 6 opening on the upper right side of the heating chamber 4 is indicated by the arrow of the solid line in the drawing. Is obliquely directed to the left in the drawing.

This is, for example, in each chamber AF of the measuring container divided into a plurality of storage chambers AF as shown in FIG. 6, for example, in the same amount of water, and the cooking support plate 15 without the above-described slit portion 17 installed. ), And the above-described high frequency heating mechanism 11 is operated to heat this.

After heating for a predetermined time, each room A-F can be determined in that temperature rise shown in Table 1 will be described later.

TABLE 1

In other words, the temperature rise of room A and D on the left is the highest, and room C and F on the right are next, and room B and room E on the center are the lowest.

Therefore, the use of the cooking support plate without the slit portion causes a heating defect in which only the left side is heated hard.

On the other hand, when the same experiment is performed using the cooking support plate 15 provided with the slit part 17 mentioned above, the result shown in Table 2 is obtained.

TABLE 2

That is, it turns out that the difference of the highest temperature and the minimum temperature in each room A-F becomes small, and the heating effect becomes uniform.

This is because by installing the above-mentioned slit part 17, microwave M ₃ (M ₆ ) is transmitted through it, and the direction of the kitchen wave when a load is applied is indicated by M ₁ indicated by a dashed line from “M ₀ ” described above. And apparently dispersed in a direction close to the arrow of M ₄ .

로 했으므로 전술한 여진구(6)로부터 방사된 마이크로파가 이들 슬릿부(17)로 유도되어져 분산되며 이들을 기준으로 각각 같은 정도의 강한 전계를 발생시킨다.In addition, the length dimension of the slit portion 17 is also approximately the microwave is most likely to resonate

Since the microwaves radiated from the above-mentioned excitation opening 6 are guided to these slit portions 17, they are dispersed and generate strong electric fields of the same degree on the basis of these.

This strong electric field acts as an antenna for the microwaves and radiates around it, and the slit 17 is balanced from the left and right to the electric field on the left and right, thereby enabling uniform heating.

정도 떨어진 위치가 가장 전계가 강하다는 것은 종래로부터 알려져 있으며, 여기어 상기 슬릿부(17)를 설치하는 것으로되며, 더욱 강한 전계가 얻어진다.Moreover, in the heating chamber 4, about from the side wall 4c.

It is known from the past that an electric field is the strongest in a position far apart, and it is assumed here that the said slit part 17 is provided, and a stronger electric field is obtained.

In the above embodiment, the length of the slit portion 17 in the longitudinal direction is longer than half the wavelength of the microwave, but the present invention is not limited thereto. The length of the slit portion 17 is slightly smaller than the half wavelength of the microwave. You may make it.

As mentioned above, 1/2 wavelength is about 60 mm, and it sets to about 50 mm shorter than this.

And as shown in FIG. 7, the experiment by the said measuring container when the center of the slit part 17A shorter than the half wavelength provided in the cooking base plate 15 coincides with the center of the cooking base plate 15, as shown in FIG. The results are shown in Table 3 below.

TABLE 3

In this case, when operating under no load, some degree of electric field concentration occurs in the slit portion 17A, and microwaves become thermal energy to heat the cooking base 15.

The microwaves transmitted to the lower portion of the cooking plate 15 decrease as much as they are heated, and the electric field is weakened, and the contact portion between the support part 16 installed on the cooking plate 15 and the side wall 4c of the heating chamber 4 is reduced. The electric field to concentrate on also weakens.

However, since the amount of microwaves passing through the slit portion 17A is reduced in the heating distribution characteristic at this time, it becomes difficult for the original kitchen wave M ₀ to be dispersed in the M ₁ direction or the M ₂ direction, This is the result of being strong.

Moreover, the test results by the said measuring container when this center is installed in the position about 20 mm (b) away from the center of the cooking base 15 without changing the length of the slit part 17A are shown in the following table. It is represented by 4.

TABLE 4

At this time, as shown in FIG. 8, when the cooking base plate 15 is viewed from the right side, the direction of the kitchen wave changes from the previous M ₅ to the present M ₆ , and the distance at which the microwave passes the load R It becomes longer in ℓ ₁ to ℓ _2, the higher the temperature of the load (R).

As shown in FIG. 9, in the state where the cooking base 15 is viewed from the left side, the direction of the kitchen wave changes from the previous M ₇ to the current M ₈ so that the distance at which the microwave passes the load R is ₃ At ℓ ₄ , the temperature of the load R is lowered.

And since the length of each slit part 17A was made slightly smaller than 1/2 wavelength of a microwave, the electric field which concentrates on the bending part of the support part 16 and the support protrusion part 14 which are lower part of the support base 15 weakens, There is no overheating or sparking.

Claims (3)

The above-described heating plate 15 made of metal disposed between the upper and lower heaters 12 and 13 and upper and lower heaters disposed above and below the heating chamber 4, respectively, to place the object to be heated. A high frequency heating device having a high frequency generating unit 11 for supplying microwaves to a chamber, and having a high frequency heating action and a heater heating action for use, wherein a pair of pairs are provided on both left and right sides opposite to the cooking support plate 15 described above. A high frequency heating apparatus characterized by providing a slit portion (17) composed of a long hole. The heating chamber (4) according to claim 1, wherein the heating chamber (4) has an excitation opening (6) for introducing microwaves supplied from the high frequency generating section (11), and the aforementioned slit portions (17) are respectively formed from the left and right side walls of the heating chamber. A high frequency heating device, characterized in that it is opened along the longitudinal direction of the excitation port at a position about 1/4 wavelength away from the microwave. The heating chamber (4) according to claim 1 or 2, wherein the heating chamber (4) has an excitation opening (6) for introducing microwaves supplied from the high frequency generating section (11), and the aforementioned slit section (17) has a A high frequency heating device, characterized in that it is opened in the length direction of about 1/2 wavelength of the above-mentioned microwave.

Images