JPH11287456A - High frequency heating equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enlarge an effective space of a heating chamber by making a waveguide which transmits high frequency waves generated by a high frequency wave generator to the heating chamber opened at an approximately central portion of a lower portion of the heating chamber and setting the opening portion as a feed plane and mounting a pedestal for installing material to be heated made of a low dielectric material on the feed plane. SOLUTION: A rectangular waveguide 6 which transmits high frequency waves 7 generated by a high frequency wave generator 3 to a heating chamber 2 is disposed at a lower portion of the heating chamber 2, and a feed plane 8 which defines a boundary between the heating chamber 2 and the waveguide 6 is disposed at the center of the bottom portion of the heating chamber 2. On this feed plane 8, a pedestal 12 for installing a material 1 to be heated which is made of a low dielectric material is mounted. Furthermore, a physical quantity detecting means 4 which detects the weight, the shape or the like of the material, 1 to be heated is provided. Based on the result of detection, the high frequency generator 3 is controlled by control means 5. In this manner, by directly irradiating the high frequency wave from the central portion of the bottom surface of the material 1 to be heated, the lower portion of the material 1 to be heated is massively heated and hence, provided that the material 1 to be heated is a liquid, this liquid can be uniformly heated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating apparatus in which a power supply surface is provided on the bottom surface of a heating chamber, high-frequency radiation is applied from below a heated object, and heating is performed with high efficiency.

[0002]

2. Description of the Related Art FIG. 13 shows, for example, Japanese Patent Application Laid-Open No. 8-321376.
FIG. 1 is a longitudinal sectional view showing a high frequency heating device of a first conventional example disclosed in Japanese Patent Application Publication No. JP-A-2006-133125.

In FIG. 13, reference numeral 1 denotes an object to be heated, reference numeral 2 denotes a heating chamber, reference numeral 3 denotes a high-frequency generator serving as a high-frequency generation source, and reference numeral 4 denotes physical quantity detecting means for detecting the physical quantity of the object 1 to be heated. There is an electric field probe sensor and the like. 5 is a control unit for controlling the high frequency generator 3 based on the detection result of the physical quantity detection means 4, 6 is a waveguide for sending the high frequency 7 from the high frequency generator 3 to the heating chamber 2, and 8 is a waveguide for heating the waveguide 6 and heating. A power supply surface at the boundary of the chamber 2, 9 is a turntable, 11 is a motor for rotating the turntable 9, and 12 is an installation table that is supported by the turntable 9 and on which the object to be heated 1 is installed.

In the high frequency heating apparatus of the first conventional example, the high frequency wave 7 generated by the high frequency generator 3 propagates through the waveguide 6 and from the upper and lower two feeding surfaces 8 to the heating chamber 2.
The object to be heated 1 placed on the installation table 12 on the rotating turntable 9 is irradiated while repeating incidence and reflection on the inner wall surface of the heating chamber 2. Thereby, the object to be heated 1 is heated.

As described above, in the above-mentioned first conventional example, the waveguide 6 is provided on the side surface of the heating chamber 2 and the power supply surface 8 is provided.
The distance between the power supply surface 8 and the object 1 to be heated is long.
The high-frequency wave 7 that has entered the heating chamber 2 from above is not directly absorbed by the object 1 to be heated, but is absorbed by the object 1 after repeating the incident reflection on the inner wall surface of the heating chamber 2. Therefore, there is a disadvantage that energy loss occurs.

Further, since a high frequency is incident from the side surface of the heating chamber 2, the side surface and the upper surface of the object to be heated 1 are easily heated, and the lower surface and the central portion are hard to be heated.

In view of the above, there has been proposed a device capable of increasing the temperature at the center of the lower surface of the object to be heated, such as a high-frequency heating device disclosed in Japanese Patent Application Laid-Open No. 9-210372. FIG. 14 is a longitudinal sectional view showing a high frequency heating apparatus of a second conventional example disclosed in the same publication, in which parts corresponding to those of the first conventional example (FIG. 13) are denoted by the same reference numerals. And description thereof is omitted.

In the second conventional high-frequency heating apparatus, a power supply surface 8 which is a boundary between the heating chamber 2 and the waveguide 6 is provided on the bottom of the heating chamber 2. Reference numeral 21 denotes a roller for supporting the periphery of the turntable 9 below and rotating the same, reference numeral 22 denotes a rotating plate for rotating the roller 21, reference numeral 23 denotes a rotating plate supporting roller for supporting and rotating the rotating plate 22, and reference numeral 24 denotes a rotating plate. Plate support roller 2
3 is a driving unit that drives the driving unit 3.

In the high frequency heating apparatus of the second conventional example, the rotating plate 22 is rotated by rotating the rotating plate supporting roller 23 by the driving unit 24, and the roller 21 is rotated by rotating the rotating plate 22, The turntable 9 rotates. As described above, by disposing the mechanism for rotating the turntable 9 on the substantially circumference along the outer edge of the turntable 9, the power supply surface 8 can be installed on the lower surface. Thereby, the high frequency wave 7 generated by the high frequency generator 3 propagates into the heating chamber 2 from the center of the bottom surface of the heating chamber 2. Therefore, the object to be heated 1
, The temperature at the center of the lower surface can be made sufficiently high.

[0010] Similarly, an example in which the power supply surface is disposed on the bottom side of the heating chamber is disclosed in Japanese Patent Application Laid-Open No. 8-321378. FIG. 15 is a vertical sectional view showing a third conventional high-frequency heating apparatus disclosed in the above publication.
Parts corresponding to those in 3) are denoted by the same reference numerals, and description thereof is omitted.

In the third conventional high-frequency heating apparatus, a power supply chamber 31 is provided on one side of the bottom surface of the heating chamber 2, and a rotating antenna 32 is installed in the power supply chamber 31. Reference numeral 33 denotes a first motor that drives the rotary antenna 32, reference numeral 34 denotes a second motor that drives the turntable 9, and reference numeral 35 denotes a control unit that controls the high-frequency generator 3, the first motor 33, and the second motor 34.

In the high frequency heating apparatus of the third conventional example, the high frequency generated by the high frequency generator 3 is transmitted from the bottom of the heating chamber 2 to the inside of the heating chamber 2 via the rotating antenna 32 in the power supply chamber 31 from the waveguide 6. Propagate to At this time, the state of the object to be heated 1 is detected by a weight sensor or a temperature sensor (not shown), and the rotary antenna 32 is driven by the first motor 33 in accordance with the detected state of the object to be heated 1 so that the directivity of high frequency is improved. Controlling. Therefore, it is possible to make the heating distribution uniform.

Similarly, an example in which the power supply surface is disposed on the bottom surface side of the heating chamber is disclosed in Japanese Patent Application Laid-Open No. 9-22775. FIG. 16 is a longitudinal sectional view showing a fourth conventional high-frequency heating apparatus disclosed in the above publication, in which the first conventional example described above (FIG. 13) is shown.
The same reference numerals are given to the portions corresponding to those described above, and the description thereof will be omitted.

The high frequency heating apparatus of the fourth conventional example does not have a turntable in the heating chamber 2 and is connected to the heating chamber 2 in order to increase the effective use space and to improve the cleanability and operability. A power supply surface 8 which is a boundary of the tube 6 is provided on the bottom surface of the heating chamber 2. Reference numeral 41 denotes a dielectric plate on which the object to be heated 1 is placed; 42, a moving body made of a conductive member for changing the length of the waveguide 6; 43, a motor for reciprocating the moving body 42; A power supply unit that connects the tube 6 and the heating chamber 2 and includes a plurality of openings.

In the high frequency heating apparatus of the fourth conventional example, the high frequency generated by the high frequency generator 3 propagates through the plurality of openings 44 through the waveguide 6 into the heating chamber 2. At this time, the moving body 42 that defines the length of the waveguide 6 is connected to the motor 4.
By reciprocating at 3, the object to be heated 1 can be heated from the lower surface with various electric field distributions.

[0016]

However, in the above-described first to third conventional examples, since the turntable 9 is installed in the heating chamber 2, the following problems arise. Existed. The structure for rotating the turntable 9 is complicated,
The number of components is increased, the failure rate is increased, and the radio wave shielding mechanism becomes difficult, resulting in lack of reliability. The effective use space in the heating chamber 2 is reduced, and the cleaning property is also deteriorated. Due to the rotation of the turntable 9, the position and orientation of the object 1 to be heated are changed, making it difficult to take out the object 1 and deteriorating the operability.

In the first and third prior arts described above, the center of the object to be heated 1 cannot be heated with high efficiency because there is no power supply surface at the center of the bottom of the heating chamber 2. There were difficulties.

Further, in the above-mentioned fourth conventional example, since the power supply portion is constituted by the plurality of openings 44, only the central portion cannot be intensively heated, and is vertically elongated. There is a problem that the object to be heated cannot be efficiently heated.

[0019] It is a technical object of the present invention to increase the effective space of the heating chamber, improve the cleanability and operability, and heat the object to be heated with high efficiency.

[0020]

According to a first aspect of the present invention, there is provided a high-frequency heating apparatus comprising: a heating chamber for storing an object to be heated; a high-frequency generator for generating a high frequency; and a weight and shape of the object to be heated. Physical quantity detecting means for detecting, control means for controlling the high frequency generator based on the detection result of the physical quantity detecting means, and a waveguide provided at the lower part of the heating chamber and transmitting the high frequency generated from the high frequency generator to the heating chamber, Provided at the boundary between the waveguide and the substantially central portion of the lower portion of the heating chamber, the power supply surface set to be equal to or wider than the width of the waveguide up to here, and made of a low dielectric constant material, And an installation table provided on the power supply surface for installing an object to be heated.

In the high-frequency heating apparatus according to a second aspect of the present invention, the wall at one end of the waveguide connected to the power supply surface has a curved surface or a curved surface having a substantially central portion of the bottom surface of the heating chamber as an inner side of an arc when viewed in plan. It is formed in a polyhedron.

In the high frequency heating apparatus according to a third aspect of the present invention, the wall at one end of the waveguide connected to the power supply surface is formed in a dish shape centered on a substantially central portion of the bottom surface of the heating chamber in plan view. It was done.

Further, in the high frequency heating apparatus according to a fourth aspect of the present invention, the power supply surface is formed in a circular or polygonal shape centered on a substantially central portion of the bottom surface of the heating chamber.

According to a fifth aspect of the present invention, in the high-frequency heating device, the power supply surface includes a circular power supply surface or a polygonal power supply surface centered on a substantially central portion of the bottom surface of the heating chamber and a slot power supply provided around the power supply surface. And a slot opening / closing means for opening and closing the slot feeding surface, and a slot opening / closing control means for controlling the driving of the slot opening / closing means based on the detection result of the physical quantity detecting means.

According to a sixth aspect of the present invention, there is provided a high-frequency heating apparatus having a movable stirrer formed of a conductor which randomly reflects high-frequency waves in multiple directions below a power supply surface in a waveguide, and a physical quantity detecting means. And a stirrer drive control means for controlling the drive of the stirrer based on the detection result.

A high-frequency heating device according to a seventh aspect of the present invention is provided with a high-frequency receiver for receiving a high frequency and strengthening an electric field below a power supply surface in the waveguide.

[0027] In the high frequency heating apparatus according to claim 8 of the present invention, the high frequency receiver is attached to the movable mechanism.
There is provided high-frequency receiver position control means for controlling the position of the high-frequency receiver by driving the movable mechanism based on the detection result of the physical quantity detection means.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. Hereinafter, the present invention will be described with reference to the illustrated embodiments. FIG. 1 is a longitudinal sectional view showing a high-frequency heating device according to claim 1 of the present invention. In the drawing, the same reference numerals are given to portions corresponding to those of the above-mentioned first conventional example (FIG. 13). Is omitted.

The high-frequency heating device according to the first embodiment includes a high-frequency heating device
Is disposed in the center of the bottom surface of the heating chamber 2, which is a boundary between the heating chamber 2 and the waveguide 6. The power supply surface 8 is set to have the same width as the width of the waveguide 6 (dimension in the direction perpendicular to the drawing). In other words, if the power supply surface 8 is circular, the diameter is the same as the width of the waveguide 6, and if the power supply surface 8 is rectangular, the dimension in the direction perpendicular to the drawing is the width of the waveguide 6. Is set to be the same as. An installation table 12 made of a low dielectric constant material and on which the object to be heated 1 is installed is provided on the power supply surface 8.
Is provided. The physical quantity detection means 4 has a function of detecting the weight and shape of the article 1 to be heated, and the control means 5 has a function of controlling the high frequency generator 3 based on the detection result of the physical quantity detection means 4.

In the high-frequency heating apparatus according to the first embodiment, the high-frequency wave 7 generated by the high-frequency generator 3 passes through the waveguide 6 below the heating chamber 2 and passes through the waveguide 6 at the center of the bottom of the heating chamber 2.
The light propagates from the power supply surface 8 set to the same width as the heating chamber 2 to the heating chamber 2, and is directly radiated from the center of the bottom surface of the article 1 to be heated on the installation table 12. Therefore, most of the high-frequency energy is directly applied to the object to be heated 1 and is absorbed by the object to be heated 1 with high efficiency.
Therefore, the object to be heated 1 can be heated with high efficiency, and the energy loss can be greatly reduced.

Further, by irradiating high frequency directly from the center of the bottom surface of the object to be heated 1 to intensively heat the lower portion of the object to be heated 1, the object to be heated 1 is made of a liquid such as milk or sake. In some cases, convection is generated and uneven heating is eliminated, and uniform heating can be performed as a whole. Furthermore, when the object to be heated 1 has a large bottom surface such as thawing or the like, the central part of the object to be heated 1 is heated intensively, so that the object 1 is uniformly heated without so-called runaway phenomena such as end boiling. be able to.

As described above, according to the high-frequency heating apparatus of the first embodiment, the turntable conventionally used for uniform heating can be dispensed with, and the object 1 can be uniformly heated without rotating it. Can be heated.

Further, by eliminating the need for a turntable, the cost of the apparatus can be reduced, the effective space for storing the article to be heated 1 can be increased, and the cleaning and operability can be improved.

Embodiment 2 FIG. 2 shows claim 1 of the present invention.
2 and 4 are transparent perspective views showing the high-frequency heating devices, and FIG. 3 is a cross-sectional view of the high-frequency heating devices. In each drawing, the same reference numerals denote the same functional portions as those in the first embodiment (FIG. 1). And the description is omitted.

In the high-frequency heating device according to the second embodiment, the wall 6a at one end of the waveguide 6A connected to the power supply surface 8A has a curved surface (in a plan view) where the substantially central portion of the bottom surface of the heating chamber 2 is inside the arc. Here, the heating chamber is formed in a cylindrical shape whose center is approximately the center of the bottom of the heating chamber, and the corresponding power supply surface 8A is centered on the center of the bottom of the heating chamber 2. It is formed in a circular shape.

In the high-frequency heating apparatus according to the second embodiment, the high-frequency waves generated by the high-frequency generator 3 are guided to the waveguide 6A at the lower part of the heating chamber 2 and formed at the tip, that is, at the lower center of the bottom of the heating chamber 2. Into the cylindrical portion, and the surface of the curved wall 6a of the cylindrical portion is collected near the central portion A of the cylindrical portion, and high-frequency energy is concentrated on the central portion A. The high-frequency energy concentrated in the vicinity A of the central portion propagates to the heating chamber 2 from the circular power supply surface 8A substantially at the center of the bottom surface of the heating chamber 2, and the lower surface of the article 1 to be heated placed on the installation table 12. Irradiate directly in the center. Therefore, most of the high-frequency energy is directly applied to the object to be heated 1 and is absorbed by the object to be heated 1 with high efficiency. Therefore, the object to be heated 1 can be heated with high efficiency, and the energy loss can be greatly reduced.

As described above, also in the high-frequency heating device of the second embodiment, a turntable can be dispensed with and the object to be heated 1 can be heated uniformly without rotating it. Further, by eliminating the need for a turntable, the cost of the apparatus can be reduced, the effective space for storing the object to be heated 1 can be increased, and the cleanability and operability can be improved.

Here, one end wall 6a of the waveguide 6A is used.
Is described as an example, and the feeding surface 8A is formed in a circular shape. However, the present invention is not limited to this. For example, the wall 6a at one end of the waveguide 6A may be heated in a plan view. The same operation and effect can be obtained even if the bottom surface of the chamber 2 is formed on a curved surface or a polyhedron having an arc inside, and the power supply surface 8A is formed on an ellipse or polygon.

Embodiment 3 FIG. 4 shows claims 1 and 3 of the present invention.
FIG. 5 is a longitudinal sectional view of the high-frequency heating device according to the first embodiment (FIG. 1). In each drawing, the same reference numerals are given to the same functional portions as those of the above-described first embodiment (FIG. 1). The description is omitted.

In the high-frequency heating device of the third embodiment, the wall 6b at one end of the waveguide 6A connected to the power supply surface 8A is formed in a dish shape centered on the substantially central portion of the bottom surface of the heating chamber 2 when viewed in plan. It was done.

In the high-frequency heating apparatus according to the third embodiment, the high-frequency waves generated by the high-frequency generator 3 are guided to the waveguide 6A below the heating chamber 2 and formed at the tip, that is, at the lower center of the bottom of the heating chamber 2. Into the dish-shaped portion, which is directly reflected upward by the curved tapered wall 6b of the dish-shaped portion, and a circular power supply surface 8A substantially at the center of the bottom surface of the heating chamber 2.
The light further propagates to the heating chamber 2 and directly irradiates the center of the lower surface of the object to be heated 1 placed on the installation table 12. Therefore, most of the high-frequency energy is directly applied to the object to be heated 1 and is absorbed by the object to be heated 1 with high efficiency. Therefore, the object to be heated 1 can be heated with high efficiency, and the energy loss can be greatly reduced.

As described above, also in the high-frequency heating device of the third embodiment, a turntable can be dispensed with and the object to be heated 1 can be heated uniformly without rotating it. Further, by eliminating the need for a turntable, the cost of the apparatus can be reduced, the effective space for storing the object to be heated 1 can be increased, and the cleanability and operability can be improved.

Embodiment 4 FIG. FIG. 6 is a cross-sectional view showing another example of the high-frequency heating device according to claim 1 of the present invention. In the drawing, the same reference numerals denote the same functional portions as those in the first embodiment (FIG. 1). And description thereof is omitted.

In the high-frequency heating device according to the fourth embodiment, the wall 6c at one end of the waveguide 6B connected to the power supply surface 8B is formed into a curved surface (in a plan view) in which the substantially central portion of the bottom surface of the heating chamber 2 is located inside the arc. Here, the heating chamber is formed in a columnar shape whose center is approximately the center of the bottom of the heating chamber and whose diameter is larger than the width of the waveguide.
The corresponding power supply surface 8B is formed in a circular shape having a large diameter centered on a substantially central portion of the bottom surface of the heating chamber 2.

In the high-frequency heating apparatus according to the fourth embodiment, the high-frequency wave generated by the high-frequency generator 3 is guided to the waveguide 6B at the lower part of the heating chamber 2 and formed at the tip, that is, at the lower center of the bottom of the heating chamber 2. Into the large-diameter cylindrical portion, and is collected near the central portion B of the cylindrical portion by the surface of the curved wall 6c of the cylindrical portion, and high-frequency energy is concentrated at the central portion B near the central portion. The high-frequency energy concentrated near the central portion B propagates to the heating chamber 2 from a circular (large-diameter) power supply surface 8B substantially at the bottom of the heating chamber 2 and is placed on a mounting table (not shown). Irradiate directly to the center of the lower surface of the object to be heated. Therefore, most of the high-frequency energy is directly applied to the object to be heated, and is absorbed by the object with high efficiency. Therefore, the object to be heated can be heated with high efficiency, and the energy loss can be significantly reduced.

The high-frequency heating device according to the fourth embodiment has a configuration in which the columnar portion serving as the high-frequency energy concentration portion of the second embodiment is set to be larger than the width of the waveguide 6B. is there. Therefore, the area B serving as the high-frequency energy concentration section can be made larger than that of the second embodiment.

As described above, also in the high-frequency heating apparatus according to the fourth embodiment, a turntable can be dispensed with and the object to be heated can be heated uniformly without rotating it. Further, by eliminating the need for a turntable, the cost of the apparatus can be reduced, the effective space for storing the object to be heated can be increased, and the cleanability and operability are improved.

Here, the wall 6c at one end of the waveguide 6B is used.
Is described in the form of a column and the power supply surface 8B is formed in a circular shape. However, the present invention is not limited to this. For example, the wall 6c at one end of the waveguide 6B may be heated in a plan view. The same operation and effect can be obtained even if the bottom surface of the chamber 2 is formed on a curved surface or a polyhedron having an arc inside, and the power supply surface 8B is formed on an ellipse or polygon.

Further, the technical idea of the fourth embodiment, that is, the end of the waveguide 6B connected to the power supply surface 8B is set to be larger than the width of the waveguide 6B up to here, so that a wide power supply surface is provided. Obtaining 8B can be applied not only to the above-described first to third embodiments, but also to all the embodiments described below.

Embodiment 5 FIG. FIG. 7 shows claim 1 of the present invention.
FIGS. 7A and 7B are enlarged plan views showing power supply surfaces of the high-frequency heating devices according to 2, 3 and 5; FIG. 7A shows a state in which the slot power supply surface is fully opened; FIG. 8 is a plan view showing the slot opening / closing plate, and FIG. 9 is a longitudinal sectional view showing the entire configuration of the apparatus including the slot opening / closing means. The same reference numerals are given to the same functional units as those of the embodiment (FIG. 1), and the description is omitted.

In the high-frequency heating apparatus according to the fifth embodiment, the power supply surfaces are a circular power supply surface (or polygonal power supply surface) 8C centered on the substantially central portion of the bottom surface of the heating chamber 2 and four peripheral portions (90).
Slot opening and closing means 50 for opening and closing each slot feeding surface 8D, and a slot for driving and controlling the slot opening and closing means 50 based on the detection result of the physical quantity detection means 4. Control means 5A to which an open / close control function is added.

More specifically, the slot opening / closing means 50 is composed of a ring-shaped slot opening / closing plate 51 arranged below the power supply surface and a driving mechanism 52 for rotating the slot opening / closing plate 51. ing.

The slot opening / closing plate 51 is formed of a ring-shaped plate as shown in FIG. 8, and the center hole 51a is set to the same shape and size as the circular power supply surface (or polygonal portion) 8C. Further, arc-shaped holes 51b having the same shape and size as the slot power supply surface 8D are formed at four circumferential positions in the plane of the slot opening / closing plate 51, and each slot power supply surface 8D is simultaneously formed by each arc-shaped hole 51b. Each slot power supply surface 8D can be simultaneously closed by each surface portion 51c between each arc-shaped hole 51b. Further, a sector gear 51d is formed on a part of the outer periphery of the slot opening / closing plate 51, and the motor 53 of the drive mechanism 52
And the pinion 54 attached to the output shaft.

In the high-frequency heating device of the fifth embodiment, the slot 53 is reciprocated by reciprocating the pinion 54 by the motor 53. That is, depending on the shape and number of the objects to be heated detected by the physical quantity detecting means 4, if there is an object to be heated having a wide bottom surface or a plurality of objects to be heated, as shown in FIG.
Fully open. Thereby, it is generated by the high frequency generator 3,
The high frequency wave propagating through the waveguide 6 below the heating chamber 2 is transmitted from the central hole 51a of the slot opening / closing plate 51 and the respective arc holes 51b.
It enters the circular power supply surface (or polygonal power supply surface) 8C and each slot power supply surface 8D formed at the lower center of the bottom surface of the heating chamber 2, and enters the circular power supply surface (or polygonal power supply surface) 8C and each slot power supply surface 8D. The light further propagates to the heating chamber 2 and directly irradiates the center of the lower surface of the object to be heated placed on the installation table 12. If there is only one heated object such as milk or sake, the driving mechanism 5
2 rotates the slot opening / closing plate 51 by 45 degrees, and FIG.
As shown in (b), each slot power supply surface 8D is closed by each surface portion 51c of the slot opening / closing plate 51, and a high frequency is applied only from the central circular power supply surface (or polygonal power supply surface) 8C to the lower surface central portion of the object to be heated. Irradiate directly. Therefore, most of the high-frequency energy is directly applied to the object to be heated, and is absorbed by the object with high efficiency. Therefore, the object to be heated can be heated with high efficiency, and the energy loss can be significantly reduced.

As described above, also in the high-frequency heating apparatus of the fifth embodiment, a turntable can be dispensed with and the object to be heated can be heated uniformly without rotating it. Further, by eliminating the need for a turntable, the cost of the apparatus can be reduced, the effective space for storing the object to be heated can be increased, and the cleanability and operability are improved.

Further, since each slot power supply surface 8D is made openable and closable, the object to be heated can be heated with high efficiency and in an optimal opening pattern with respect to the position, size and type of the object to be heated.

Embodiment 6 FIG. FIG. 10 shows claim 1 of the present invention.
It is a longitudinal cross-sectional view which shows the high frequency heating apparatus which concerns on 2,3,4,5,6, In the figure, the same code | symbol is attached | subjected to the same function part as the thing of 1st Embodiment (FIG. 1) mentioned above, and description Is omitted.

The high-frequency heating device according to the sixth embodiment has a movable stirrer 61 formed of a conductor that randomly reflects high-frequency waves in multiple directions and drives the stirrer 61 below the power supply surface 8 in the waveguide 6. Means 5B provided with a motor 62 for controlling the operation of the stirrer 61 based on the detection result of the physical quantity detecting means 4
Is provided.

In the high-frequency heating device according to the sixth embodiment, a motor 62 rotates a stirrer 61 disposed at the lower center of the bottom of the heating chamber 2. Thus, the high frequency generated by the high frequency generator 3 and propagated through the waveguide 6 below the heating chamber 2 is reflected in multiple directions by the stirrer 61, and is heated from the power supply surface 8 substantially at the bottom of the heating chamber 2. The light propagates to the chamber 2 and is directly and randomly irradiated on the object to be heated 1 placed on the installation table 12. Therefore, when heating an object to be heated having a wide bottom surface or a plurality of objects to be heated, the object to be heated is highly efficient,
In addition, heating can be performed while suppressing uneven heating. As described above, most of the high-frequency energy is directly applied to the object to be heated 1 and is absorbed by the object to be heated 1 with high efficiency. Therefore, the object to be heated 1 can be heated with high efficiency, and the energy loss can be significantly reduced.

As described above, also in the high-frequency heating device of the sixth embodiment, a turntable can be dispensed with and the object to be heated can be heated uniformly without rotating it. Further, by eliminating the need for a turntable, the cost of the apparatus can be reduced, the effective space for storing the object to be heated can be increased, and the cleanability and operability are improved.

Embodiment 7 FIG. 11 shows claim 1 of the present invention.
It is a longitudinal cross-sectional view which shows the high frequency heating apparatus which concerns on 2,3,4,5,7, In the figure, the same code | symbol is attached | subjected to the same function part as the thing of 1st Embodiment (FIG. 1) mentioned above, and description Is omitted.

The high-frequency heating apparatus according to the seventh embodiment has a high-frequency heating device set below the power supply surface 8 in the waveguide 6 so as to have a length equal to or more than 波長 of the wavelength at which the high-frequency is received and the electric field is strengthened. The receiver 71 is provided.

In the high-frequency heating device of the seventh embodiment, the high-frequency wave generated by the high-frequency generator 3 propagates through the waveguide 6 below the heating chamber 2, and the power supply surface 8 substantially at the center of the bottom surface of the heating chamber 2. The light further propagates to the heating chamber 2 and directly irradiates the bottom surface of the object to be heated 1 placed on the installation table 12. At this time, the high frequency propagating through the waveguide 6 is once received by the high frequency receiver 71. Therefore, the strong electric field region C
Is generated, and the efficiency of irradiation on the bottom surface of the article to be heated 1 is improved.
Therefore, most of the high frequency energy is directly transmitted to the object 1 to be heated.
And is absorbed by the object to be heated 1 with high efficiency. Therefore, the object to be heated 1 can be heated with high efficiency, and the energy loss can be significantly reduced.

As described above, also in the high-frequency heating device of the seventh embodiment, a turntable can be dispensed with and the object to be heated can be heated uniformly without rotating it. Further, by eliminating the need for a turntable, the cost of the apparatus can be reduced, the effective space for storing the object to be heated can be increased, and the cleanability and operability are improved.

Embodiment 8 FIG. FIG. 12 shows claim 1 of the present invention.
It is a longitudinal cross-sectional view which shows the high frequency heating apparatus which concerns on 2,3,4,5,7,8. In the figure, the same code | symbol is attached | subjected to the same function part as the thing of said 7th embodiment (FIG. 11). The description is omitted.

The high-frequency heating device according to the eighth embodiment is set below the power supply surface 8 in the waveguide 6 and is set to have a length equal to or longer than の of the wavelength at which the high frequency is received and the electric field is strengthened. The high-frequency receiver 71 is mounted on a horizontal rotary plate 72 so that the rotary plate 72 can be driven by a motor 73, and based on the detection result of the physical quantity detection means 4,
Is provided with a control means 5C to which a high-frequency receiver driving control function for controlling the position of the high-frequency receiver 71 by driving is controlled.

In the high-frequency heating apparatus according to the eighth embodiment, by rotating the rotary plate 72 by the motor 73 and changing the position of the high-frequency receiver 71, the location for receiving the high-frequency can be arbitrarily specified, and the arbitrary heating can be performed. Can be distributed. As a result, with high efficiency with respect to any object 1 to be heated,
In addition, heating can be performed while suppressing uneven heating. That is, high-frequency energy can be directly applied to the object to be heated 1 with high efficiency. Therefore, the object to be heated 1 can be heated with high efficiency, and the energy loss can be significantly reduced.

Also in the high-frequency heating device of the eighth embodiment, a turntable can be dispensed with and the object to be heated can be heated uniformly without rotating it. Further, by eliminating the need for a turntable, the cost of the apparatus can be reduced, the effective space for storing the object to be heated can be increased, and the cleanability and operability are improved.

[0069]

As described above, according to the first aspect of the present invention, the width of the waveguide equal to or smaller than the width of the waveguide up to the center of the lower portion of the heating chamber and the boundary between the waveguide and the waveguide. Since a wider power supply surface is set, most of the high-frequency energy can be directly radiated to the object to be heated, and can be absorbed by the object to be heated with high efficiency. Therefore, the object to be heated can be heated with high efficiency, the energy loss can be greatly reduced, and the runaway phenomenon can be prevented.
It can be heated uniformly. Furthermore, a turntable can be dispensed with, the equipment cost can be reduced, and the effective space for accommodating the object to be heated can be enlarged, and the cleaning property can be improved.
Operability can be improved.

According to the second aspect of the present invention, the wall at one end of the waveguide connected to the power supply surface is formed into a curved surface or a polyhedron having a substantially central portion of the bottom surface of the heating chamber as an inside of an arc when viewed in plan. Therefore, high-frequency energy can be concentrated near the center of the bottom surface of the heating chamber, and the object to be heated can be heated with high efficiency. For this reason, energy loss can be significantly reduced, the runaway phenomenon can be prevented, and uniform heating can be achieved. Furthermore, a turntable can be dispensed with, the equipment cost can be reduced,
In addition, the effective space for storing the object to be heated can be enlarged, and the cleanability and operability can be improved.

According to the third aspect of the present invention, the wall at one end of the waveguide connected to the power supply surface is formed in a dish shape centered on the substantially central portion of the bottom surface of the heating chamber when viewed in a plan view. The high-frequency energy guided to the waveguide at the lower part of the chamber is directly reflected upward by the curved tapered wall surface of the dish-shaped portion, and is directly transmitted to the heating chamber from the circular power supply surface substantially at the center of the bottom of the heating chamber. It can be reflected and propagated. Therefore, high-frequency energy can be concentrated near the center of the bottom surface of the heating chamber, and the object to be heated can be heated with high efficiency. In addition, energy loss can be greatly reduced, and the runaway phenomenon can be prevented and uniform heating can be performed. Further, a turntable can be eliminated, the cost of the apparatus can be reduced, the effective space for storing the object to be heated can be expanded, and the cleanability and operability can be improved.

According to the fourth aspect of the present invention, since the power supply surface is formed in a circular or polygonal shape centered on the substantially central portion of the bottom surface of the heating chamber, high-frequency energy from the lower waveguide can be efficiently used. It can propagate into the heating chamber. Further, a turntable can be eliminated, the cost of the apparatus can be reduced, the effective space for storing the object to be heated can be expanded, and the cleanability and operability can be improved.

According to the fifth aspect of the present invention, the power supply surface is formed of a circular power supply surface or a polygonal power supply surface centered on a substantially central portion of the bottom surface of the heating chamber, and a slot power supply surface provided therearound. And the slot opening / closing means for opening / closing the slot power supply surface and the slot opening / closing control means for driving and controlling the slot opening / closing means based on the detection result of the physical quantity detecting means, so that the position, size and type of the object to be heated are provided. In contrast, heating can be performed with an optimum opening pattern with high efficiency. In addition, high-frequency energy from the lower waveguide is efficiently transferred from the lower waveguide to the heating chamber from a circular or polygonal power supply surface centered on the approximate center of the bottom of the heating chamber. Can be propagated. Further, a turntable can be eliminated, the cost of the apparatus can be reduced, the effective space for storing the object to be heated can be expanded, and the cleanability and operability can be improved.

According to the present invention, a movable stirrer composed of a conductor that randomly reflects high frequency waves in multiple directions is provided below the power supply surface in the waveguide, and the detection result of the physical quantity detection means is provided. Since the stirrer drive control means for driving and controlling the stirrer is provided, the high frequency propagating through the waveguide at the lower portion of the heating chamber is reflected in multiple directions by the stirrer. The light is propagated to the heating chamber, and can be directly and randomly irradiated on the object to be heated placed on the installation table. For this reason, when heating an object to be heated having a wide bottom surface or a plurality of objects to be heated, the object to be heated can be heated with high efficiency and with reduced heating unevenness. As described above, most of the high-frequency energy is directly applied to the object to be heated 1 and is absorbed by the object to be heated with high efficiency.
Therefore, the object to be heated 1 can be heated with high efficiency,
Energy loss can be significantly reduced. Further, a turntable can be eliminated, the cost of the apparatus can be reduced, the effective space for storing the object to be heated can be expanded, and the cleanability and operability can be improved.

According to the seventh aspect of the present invention, since the high frequency receiver for receiving the high frequency and strengthening the electric field is provided below the power supply surface in the waveguide, a strong electric field area around the high frequency receiver is generated. The efficiency of irradiation on the bottom surface of the object to be heated is improved. Therefore, most of the high-frequency energy is directly applied to the object to be heated, and is absorbed by the object with high efficiency. Therefore, the object to be heated 1 can be heated with high efficiency, and the energy loss can be significantly reduced. Furthermore, a turntable can be dispensed with, the equipment cost can be reduced, and the effective space for accommodating the object to be heated can be enlarged, and the cleaning property can be improved.
Operability can be improved.

According to the eighth aspect of the present invention, the high frequency receiver is mounted on the movable mechanism, and the high frequency receiver controls the position of the high frequency receiver by driving the movable mechanism based on the detection result of the physical quantity detecting means. Since the position control means is provided, a place for receiving the high frequency can be arbitrarily specified, and an arbitrary heating distribution can be obtained. For this reason, it is possible to heat any object to be heated with high efficiency and with reduced heating unevenness. In addition, high-frequency energy can be directly applied to the object to be heated with high efficiency, the object to be heated can be heated with high efficiency, and energy loss can be significantly reduced. Further, a turntable can be eliminated, the cost of the apparatus can be reduced, the effective space for storing the object to be heated can be expanded, and the cleanability and operability can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a high-frequency heating device according to a first embodiment of the present invention.

FIG. 2 is a perspective view transparently showing a high-frequency heating device according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a high-frequency heating device according to a second embodiment.

FIG. 4 is a perspective view transparently showing a high-frequency heating device according to a third embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a high-frequency heating device according to a third embodiment.

FIG. 6 is a cross-sectional view of a high-frequency heating device according to a fourth embodiment of the present invention.

FIG. 7 is an enlarged plan view showing a power supply surface portion of a high-frequency heating device according to a fifth embodiment of the present invention.

FIG. 8 is a plan view showing a slot opening / closing plate of a high-frequency heating device according to a fifth embodiment.

FIG. 9 is a longitudinal sectional view showing the entire configuration of a high-frequency heating device according to a fifth embodiment.

FIG. 10 is a longitudinal sectional view of a high-frequency heating device according to a sixth embodiment of the present invention.

FIG. 11 is a longitudinal sectional view of a high-frequency heating device according to a seventh embodiment of the present invention.

FIG. 12 is a longitudinal sectional view of a high-frequency heating device according to an eighth embodiment of the present invention.

FIG. 13 is a longitudinal sectional view showing a high frequency heating device of a first conventional example.

FIG. 14 is a longitudinal sectional view showing a high frequency heating device of a second conventional example.

FIG. 15 is a longitudinal sectional view showing a high frequency heating device of a third conventional example.

FIG. 16 is a longitudinal sectional view showing a high frequency heating device of a fourth conventional example.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 object to be heated, 2 heating chamber, 3 high-frequency generator, 4 physical quantity detection means, 5 control means, 5A control means (slot open / close control means), 5B control means (stirrer drive control means), 5C control means (high-frequency receiver Position control means),
6, 6A, 6B waveguide, 6a, 6b, 6c One end wall of waveguide, 7 high frequency, 8, 8A, 8B power supply surface, 8C circular power supply surface, 8D slot power supply surface, 12 mounting table, 50
Slot opening / closing means, 61 movable stirrer, 71 high frequency receiver, 72 horizontal rotating plate (high frequency receiver movable mechanism).

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tetsuya Miyamae 1728-1 Komaeda, Hanazono-cho, Osato-gun, Saitama Prefecture Mitsubishi Electric Home Equipment Co., Ltd.

Claims (8)

[Claims] 1. A heating chamber for accommodating an object to be heated, a high frequency generator for generating a high frequency, a physical quantity detecting means for detecting a weight and a shape of the object to be heated, and based on a detection result of the physical quantity detecting means. Control means for controlling the high-frequency generator; a waveguide provided in the lower part of the heating chamber, for transmitting a high-frequency wave generated from the high-frequency generator to the heating chamber; A power supply surface that is provided at the boundary of the waveguide and that is set to be equal to or wider than the width of the waveguide up to the waveguide; and a low-dielectric-constant material that is provided on the power supply surface and is heated. A high-frequency heating device comprising: an installation table on which an object is installed. 2. A wall at one end of a waveguide connected to a power supply surface,
2. A curved surface or a polyhedron having a substantially central portion of a bottom surface of the heating chamber as an inner side of a circular arc in a plan view.
The high-frequency heating device as described. 3. A wall at one end of a waveguide connected to a power supply surface,
2. The high-frequency heating device according to claim 1, wherein the heating device is formed in a dish shape centered on a substantially central portion of a bottom surface of the heating chamber when viewed in plan. 4. The high-frequency heating apparatus according to claim 1, wherein the power supply surface is formed in a circular or polygonal shape centered on a substantially central portion of the bottom surface of the heating chamber. 5. The power supply surface is formed of a circular power supply surface or a polygonal power supply surface centered on a substantially central portion of the bottom surface of the heating chamber, and a slot power supply surface provided therearound. 4. A slot opening / closing means for controlling the slot opening / closing means based on a detection result of the physical quantity detecting means. High frequency heating device. 6. A stirrer provided below a power supply surface in a waveguide, the movable stirrer being constituted by a conductor that randomly reflects high frequency waves in multiple directions, and a stirrer that drives and controls the stirrer based on a detection result of a physical quantity detection unit. The high-frequency heating device according to any one of claims 1 to 5, further comprising a drive control unit. 7. The high-frequency heating apparatus according to claim 1, further comprising a high-frequency receiver for receiving a high-frequency wave and increasing an electric field below the power supply surface in the waveguide. . 8. A high-frequency receiver position control means for attaching the high-frequency receiver to the movable mechanism and driving the movable mechanism based on the detection result of the physical quantity detection means to control the position of the high-frequency receiver. The high-frequency heating device according to claim 7, wherein: