JP3623676B2 - High frequency heating device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-frequency heating apparatus that irradiates an object to be heated with microwaves radiated from a magnetron and cooks it.
[0002]
[Prior art]
FIG. 9 is a front sectional view showing a general high-frequency heating apparatus as a conventional example. In FIG. 9, reference numeral 1 denotes a heating chamber in which the object to be heated 2 is accommodated, 3 denotes a disk-like mounting table disposed on the lower part of the heating chamber 1 to place the object to be heated 2, and 4 denotes the mounting table 3. A metal circular rotating plate 5 to be supported is a motor which is provided outside the heating chamber 1 and rotates the circular rotating plate 4. Reference numeral 6 denotes a waveguide that is arranged on the outer wall portion of the heating chamber 1 and transmits microwaves radiated from the magnetron 7 to the heating chamber 1 through the magnetron protection member 8.
[0003]
Next, the operation of the conventional high frequency heating apparatus will be described. In FIG. 9, the microwave radiated from the magnetron 7 is transmitted from the waveguide 6 to the heating chamber 1 through the magnetron protection member 8. And the to-be-heated material 2 is cooked by irradiating the to-be-heated material 2 with the microwave transmitted to the heating chamber 1 repeating incidence and reflection to this wall surface. At this time, the object 5 is rotated by rotating the motor 5.
[0004]
[Problems to be solved by the invention]
In the conventional high-frequency heating apparatus, as described above, the microwave is not directly incident on the object to be heated, and is irradiated on the object to be heated while repeating incidence and reflection on the side wall surface of the heating chamber. However, the energy of the microwave attenuates when it enters the side wall surface of the heating chamber. For this reason, if the frequency | count of reflection on the side wall surface of a heating chamber increases, the energy loss of a microwave will become large. Therefore, there is a problem that the heating efficiency of the article to be heated is reduced and heating unevenness is likely to occur.
[0005]
In addition, the microwave is difficult to irradiate intensively on the region near the center of the object to be heated due to the transmission path described above. Therefore, for example, when sake or milk is put in a vertically long container and cooked, there is a problem that the elapsed time until it is sufficiently heated and heating unevenness occurs.
[0006]
Furthermore, since the height of the heating chamber is relatively low and the mounting table and the rotating plate are disposed above the bottom of the heating chamber, the effective volume is reduced, and thus a container having a high height, such as 2 Tokutoshi There was a problem that it could not be accommodated.
[0007]
The present invention has been made to solve such problems, and devised the arrangement of the waveguide, the shape of the mounting table and the rotating plate, and the location of the microwave in the region at the lower center of the object to be heated. The object is to provide a high-frequency heating apparatus that irradiates the target object intensively, eliminates insufficient heating and uneven heating of the object to be heated, and further increases the effective volume of the heating chamber.
[0008]
[Means for Solving the Problems]
The high-frequency heating device according to the present invention is provided with a heating chamber that accommodates an object to be heated, a power supply port provided at the center of the bottom of the heating chamber, and a waveguide connected to the power supply port and parallel to the bottom of the heating chamber. In the waveguide, a rotating body is arranged at a position facing the power feeding port, and a plurality of annular plates having an inner diameter substantially equal to one wavelength of the microwave are arranged vertically at predetermined intervals. I made it.
[0009]
In addition, the rotating body is detachably disposed.
[0010]
In addition, a plate for placing an object to be heated on the rotating body is detachably mounted.
[0011]
A heating chamber that accommodates an object to be heated; a power supply port provided at the center of the bottom of the heating chamber; a waveguide connected to the power supply port and provided in parallel along the bottom of the heating chamber; a rotating body disposed at a position facing the feeding port of the waveguide, is mounted in front Symbol rotating body on which disposed in the waveguide through the feeding opening in the central portion is disposed in the heating chamber And a mounting table in which a concave portion is formed.
[0012]
Further, the outer diameter of the rotating body and the inner diameter of the mounting table recess are formed to be substantially equal to one wavelength of the microwave.
[0013]
A plurality of metal pieces are attached to the opposing positions of the inner wall surface of the mounting table recess.
[0014]
In addition, the dish on which the object to be heated is placed on the placing table is detachably placed.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a front sectional view for explaining an embodiment of a high-frequency heating device according to the present invention. In FIG. 1, the same reference numerals as in the conventional example indicate the same or corresponding parts. In FIG. 1, reference numeral 9 denotes an opening formed in the center of the bottom of the heating chamber 1, and a waveguide 6 is provided in a horizontal manner so as to communicate with the opening 9. Here, for example, the width of the waveguide 6 is set to 60 to 80 mm (a range corresponding to ½ of the wavelength of the microwave), the height is set to about 35 mm, and the inner diameter of the microwave outlet (A in FIG. 1) is set. ) Is set to about 160 mm. A ring-shaped rotating plate 10 that is rotated by the rotation of the motor 5 is disposed in the space of the microwave outlet of the waveguide 6, and the disk-shaped mounting table 3 is placed on the ring-shaped rotating plate 10. Put on. Further, a glass dish 11 on which the article to be heated 2 is placed is placed on the mounting table 3.
[0016]
As shown in FIG. 2, the specific structure of the ring-shaped rotating plate 10 is such that one end of a support bar 10b is attached to a plurality of locations of the ring-shaped first rotating plate 10a, and the other end of the support bar 10b is a ring-like shape. The second rotating plate 10c is attached. A cross-shaped support plate 10d is provided on the inner periphery of the second rotating plate 10c, and a shaft hole of the motor 5 is formed at the center of the support plate 10d. Here, the outer diameter of the ring-shaped first rotating plate 10a and the second rotating plate 10c is set to about 140 mm, and the inner diameter is set to about 120 mm.
[0017]
Next, the operation of the high-frequency heating device of the present invention will be described with reference to FIGS. In FIG. 1 and FIG. 2, when the operation of the heating device is started, the microwave radiated from the magnetron 7 passes through the magnetron protection member 8 disposed at a predetermined position of the waveguide 6. And this microwave progresses between the 1st rotation board 10a and the 2nd rotation board 10c, or the lower part of the 2nd rotation board 10c, and it is disk shape from the opening part 9 formed in the bottom part of the heating chamber 1. FIG. The glass plate 11 is further passed through the mounting table 3. Here, the disk-shaped mounting table 3 employs a low dielectric constant type such as ceramic or glass having a characteristic of allowing microwaves to pass therethrough.
[0018]
As a result, the microwave is radiated in a concentrated manner to the region at the substantially lower center of the object to be heated 2 that rotates integrally with the ring-shaped rotating plate 10, so that the heat generated in this region is applied to the object to be heated 2. It moves to the whole part and becomes a uniform temperature. Therefore, there is little uneven heating of the article 2 to be heated, and the elapsed time until this article is heated is shortened.
[0019]
In addition, when cooking a heated object 2 in a container with height, for example, sake or milk in a glass of 2 Gotoku Tori, the disk-shaped mounting table 3 and the glass dish 11 are removed, and the inner diameter is reduced. This container is accommodated in a ring-shaped rotating plate 10 set to about 120 mm. Next, when the operation of the heating device is started, the microwave that has passed through the magnetron protection member 8 is directly and intensively applied to the lower part of the object to be heated 2 that rotates together with the ring-shaped rotating plate 10. . As a result, the number of microwaves incident / reflected on the side wall surface of the waveguide 6 can be extremely reduced, so that the object to be heated is irradiated with microwaves having high energy.
With such a configuration, in the case of vertically long sake, for example, sake in milk of 2 Gotoku or milk in a glass, heating the lower part of the heated portion reduces heating unevenness and shortens the cooking time.
[0020]
As described above, when cooking the heated object 2 having a large volume or the heated object 2 in a container having a height, a part of the space of the waveguide 6 is appropriately used or not used appropriately. It is possible to cook evenly while adjusting the effective volume.
[0021]
Embodiment 2. FIG.
FIG. 3 is a front sectional view for explaining another embodiment of the high-frequency heating device according to the present invention. In FIG. 3, the same reference numerals as those of the conventional example or the first embodiment indicate the same or corresponding parts. Reference numeral 12 denotes a concave mounting table in which a concave portion is formed at the central portion of the disk-shaped mounting table 3, and this concave portion is a circular rotating plate disposed in the lower space of the microwave outlet portion of the waveguide 6. 4 to be placed on top of each other. And the glass dish 11 in which the to-be-heated material 2 is mounted is put in the state which block | closes the recessed part of the concave mounting base 12. FIG. Here, as in the first embodiment, the concave mounting table 12 is of a low dielectric constant type such as ceramic or glass.
[0022]
Next, when the operation of the heating device is started, the microwave radiated from the magnetron passes through the side wall portion of the concave mounting table 12 from the magnetron protection member 8. Then, this microwave is intensively applied to the region at the lower part of the approximate center of the object to be heated 2 that rotates together with the circular rotating plate 4. Thereby, the elimination of the heating unevenness of the article 2 to be heated and the shortening of the heating time can be obtained as described above.
[0023]
In addition, when cooking the heated object 2 in a container with height, for example, sake or milk in 2 glass bottles, the glass plate 11 is removed and the concave platen 12 has the above-mentioned recess. Hold the container. Thereby, the microwave passes through the side wall of the concave mounting table 12 and is directly and intensively irradiated to the lower part of the object to be heated 2 that rotates together with the circular rotating plate 4.
With such a configuration, similarly to the first embodiment, the heating unevenness of the object to be heated is small, and the cooking time is shortened.
[0024]
Alternatively, a hole may be formed in the central portion of the concave portion of the concave mounting table 12, and the rotation shaft of the motor 5 may be fitted into the hole portion. Thereby, the to-be-heated material 2 can be cooked without using the circular rotating plate 4. The same applies to the third embodiment.
[0025]
In addition, when cooking the heated object 2 in a container having a height, as shown in FIG. 4, the concave mounting table 12 is removed in addition to the glass dish 11, and the container is replaced with a circular rotating plate. It may be placed directly on 4 and cooked by heating. As a result, the same effect as described above can be obtained.
[0026]
Embodiment 3 FIG.
FIG. 5 is a front sectional view for explaining still another embodiment of the high-frequency heating device according to the present invention. In FIG. 5, the same reference numerals as those of the conventional example or the first and second embodiments indicate the same or corresponding parts. Reference numeral 13 denotes two metal pieces that are fixed to the inner wall surface of the concave portion of the concave mounting table 12 described in the second embodiment. 6 (a) and 6 (b) are plan sectional views of the concave portion of the concave mounting table 12, and two pieces of metal are provided at positions facing the inner wall surface (A in FIG. 6). 13 is fixed. In FIG. 6A, the concave mounting table 12 rotates in one direction at a predetermined speed, and microwaves traveling from a certain direction pass through the side wall of the concave mounting table 12 and two metal pieces 13 are obtained. It shows the state going to. 6B, the concave mounting table 12 rotates in one direction, and the microwave traveling from a certain direction passes through the side wall of the concave mounting table 12 and is reflected by the two metal pieces 13. State.
[0027]
Next, the operation of the high-frequency heating device of the present invention will be described with reference to FIG. In FIG. 5, the microwave radiated from the magnetron 7 passes through the side wall portion of the concave mounting table 12 from the magnetron protection member 8 toward the two metal pieces 13 (a state in FIG. 6A). Here, a microwave electric field strength distribution characteristic as shown in FIG. 7 is shown by an antenna action, that is, an electromagnetic wave gathering action by the plurality of metal pieces 13 in the recess.
[0028]
In FIG. 7, the location where the two metal pieces 13 are present in the recess has a very high electric field strength of the microwave and indicates Ep (KV / m). And it turns out that the electric field strength of a microwave is gradually falling as it moves away from each metal piece 13 (A and B patterns in FIG. 7). However, in practice, it is assumed that a C pattern in which the electric field strength of each metal piece 13 is synthesized is formed. For this reason, there is no unevenness in the electric field strength in the recess, and Ep can be maintained substantially constant.
[0029]
With such a configuration, a microwave having an electric field intensity Ep (KV / m) is applied to a region at the lower part of the center of the object to be heated 2 placed on the glass dish 11 that rotates integrally with the circular rotating plate 4. It can be irradiated intensively. In addition, when cooking a heated object 2 in a container with height, for example, sake or milk in a glass of 2 Gotoku, this container is removed in the recess of the recess 12 by removing the glass plate 11. Contain. As a result, a microwave having an electric field strength EP (KV / m) is directly and intensively applied to the lower part of the container rotating integrally with the circular rotating plate 4. Therefore, the heating unevenness of the article to be heated 2 is very small, and the cooking time is further shortened.
[0030]
Further, as shown in FIG. 8, a circular rotating plate 4 provided in the waveguide 6 in the vicinity of the opening 9 formed in the center of the bottom of the heating chamber 1 described in the first to third embodiments. The ring-shaped rotating plate 10, the concave mounting table 12, and the motor 5 for rotationally driving them are removed. And the container with the height which contains the liquid to-be-heated material 2 in the waveguide 6 may be directly accommodated. As a result, microwaves are intensively applied to the lower portion of the stationary container, so that there is almost no heating unevenness due to the convection effect and the cooking time can be shortened.
[0031]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0032]
The high-frequency heating device according to the present invention is provided with a heating chamber that accommodates an object to be heated, a power supply port provided at the center of the bottom of the heating chamber, and a waveguide connected to the power supply port and parallel to the bottom of the heating chamber. In the waveguide, a rotating body is arranged at a position facing the power feeding port, and a plurality of annular plates having an inner diameter substantially equal to one wavelength of the microwave are arranged vertically at predetermined intervals. Since the microwave radiated from the magnetron passes between the upper and lower annular plates, etc., the region at the lower part of the approximate center of the object to be heated placed on the plate-shaped mounting table that rotates integrally with the annular plates Is irradiated. In addition, it is possible to house a container having a height in the upper and lower annular plates, and to irradiate the microwave intensively to the lower part of the object to be heated in the container that rotates integrally with the annular plates. . Therefore, it is possible to expect the effects that the effective volume of the heating chamber is expanded, the heating unevenness of the object to be heated is small, and the cooking time is shortened.
[0033]
In addition, since the rotating body is detachably disposed, a vertically long container having a height in which a liquid object to be heated is contained in a waveguide near the opening formed in the center of the bottom of the heating chamber. It can be accommodated easily, that is, the effective space can be expanded. And since the motor which is a rotational drive component is unnecessary, the effect that component cost can be reduced can be anticipated.
[0034]
In addition, since the dish on which the object to be heated is placed on the rotating body is detachably mounted, if the object to be heated has a large volume, cooking is performed using the dish, and the object to be heated has a small volume. The effect of reducing the heating unevenness by freely adjusting the effective volume in the heating chamber, in which cooking is performed without a dish, can be expected.
[0035]
A heating chamber that accommodates an object to be heated; a power supply port provided at the center of the bottom of the heating chamber; a waveguide connected to the power supply port and provided in parallel along the bottom of the heating chamber; a rotating body disposed at a position facing the feeding port of the waveguide, is mounted in front Symbol rotating body on which disposed in the waveguide through the feeding opening in the central portion is disposed in the heating chamber The microwave radiated from the magnetron is applied to the region near the center of the heated object having a large volume that rotates together with the mounting table. Furthermore, it is possible to house a container having a height in the recess of the mounting table, and to irradiate the micro group intensively to the lower part of the object to be heated in the container that rotates integrally with the mounting table. Therefore, it is possible to expect an effect that the effective volume of the heating chamber is freely adjusted to heat the object to be heated evenly and the cooking time is shortened.
[0036]
In addition, since the outer diameter of the rotating body and the inner diameter of the mounting table recess are formed to be approximately equal to one wavelength of the microwave, a container having a height in the aforementioned recess can be easily accommodated and rotated while being liquid. It can be expected that the object to be heated is cooked.
[0037]
In addition, since the plurality of metal pieces are attached to the opposing positions of the inner wall surface of the mounting table recess, the microwaves are directed toward the metal piece by the antenna action, that is, the electromagnetic wave gathering action. Thereby, there is no unevenness in the magnitude of the microwave energy, that is, the electric field strength in the recess, and the microwave is intensively irradiated onto the object to be heated. Therefore, the effect that the heating unevenness of the article to be heated can be further eliminated can be expected.
[0038]
In addition, since the dish on which the object to be heated is placed on the mounting table is detachably mounted, the heated object having a large volume that rotates integrally with the mounting table or the object to be heated in a container having a height is arranged. It is possible to irradiate the microwave to the lower part of the center. Therefore, it is possible to expect an effect that the effective volume of the heating chamber is freely adjusted to heat the object to be heated evenly and the cooking time is shortened.
[Brief description of the drawings]
FIG. 1 is a front sectional view of a high-frequency heating device according to a first embodiment.
FIG. 2 is an enlarged perspective view of a ring-shaped rotating plate according to the first embodiment.
FIG. 3 is a front sectional view of a high-frequency heating device according to a second embodiment.
4 is a front sectional view of another high-frequency heating device according to Embodiment 2. FIG.
5 is a front sectional view of a high-frequency heating device according to Embodiment 3. FIG.
6 is an enlarged perspective view of a concave mounting table according to Embodiment 3. FIG.
FIG. 7 is a distribution characteristic diagram of microwave electric field strength in a concave portion of the concave mounting table according to the third embodiment.
FIG. 8 is a front sectional view of the high-frequency heating device according to Embodiments 1 to 3.
FIG. 9 is a front sectional view of a conventional high-frequency heating device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heating chamber, 2 To-be-heated object, 3 Plate-shaped mounting base, 4 Metal circular rotary plate, 5 Motor, 6 Waveguide, 7 Magnetron, 8 Magnetron protection member, 9 Opening part, 10 Ring-shaped Rotating plate, 11 dishes, 12 concave mounting table, 13 metal pieces.

Claims (7)

A heating chamber for storing an object to be heated, a power supply port provided at the center of the bottom of the heating chamber, a waveguide connected to the power supply port and provided in parallel along the bottom of the heating chamber, and the waveguide A rotating body disposed in a tube at a position facing the power supply port, and the rotating body includes a plurality of annular plates having an inner diameter substantially equal to one wavelength of the microwave at a predetermined interval in the vertical direction. A high-frequency heating device characterized by comprising: The high-frequency heating device according to claim 1, wherein the rotating body is detachably disposed. The high-frequency heating device according to claim 1, wherein a dish on which the object to be heated is placed on the rotating body is detachable. A heating chamber for storing an object to be heated, a power supply port provided at the center of the bottom of the heating chamber, a waveguide connected to the power supply port and provided in parallel along the bottom of the heating chamber, and the waveguide a rotating body disposed at a position facing the feeding port of the tube, the recess being placed before Symbol rotating body on which disposed in the waveguide through the feeding opening in the central portion is disposed in the heating chamber A high-frequency heating apparatus comprising: a mounting table on which is formed. 5. The high frequency heating apparatus according to claim 4, wherein the outer diameter of the rotating body and the inner diameter of the mounting table recess are formed approximately equal to one wavelength of the microwave. 6. The high frequency heating apparatus according to claim 4 or 5 , wherein a plurality of metal pieces are attached to positions facing the inner wall surface of the mounting table recess. The high-frequency heating apparatus according to any one of claims 4 to 6, wherein a dish on which an object to be heated is placed is detachably placed on the placing table.

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