JP2611740B2 - Electromagnetic wave heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device for heating an object using electromagnetic waves including microwaves. Particularly suitable for drying raw foods.

[0002]

2. Description of the Related Art Heating devices using microwaves are already widely used in microwave ovens for home use, including industrial use. Heating a substance having a large dielectric loss, such as water, by utilizing heat generated in proportion to the magnitude of the dielectric loss when exposed to microwaves. Many heating devices (for example, literature: “Nikkei New Materials March 30, 1992
As shown in FIG. 5, the applicator 11
The turntable 10 is placed in the inside, and the object to be heated is put thereon and rotated. Since the microwave is reflected irregularly on the metal wall surface in the applicator 11 and radiated to the target, the microwave is not sufficiently absorbed by the target but is largely reflected.

Therefore, in order to perform efficient heating, an applicator as shown in FIG. 4 (comparative example) has been filed by the applicant of the present invention in Japanese Patent Application No. 6-9029. In this case, the object to be heated is placed in a wedge-shaped or pyramid-shaped container with a low dielectric loss having a downwardly convex shape, and the microwave is irradiated from below, so that the reflection can be reduced and the efficiency is extremely high. It can be heated well.

[0004]

However, in the case of a downwardly convex container as shown in FIG. 4, the water that has oozed out of the object to be heated accumulates at the tip of the convex, and the water that has been separated is bothersomely evaporated by microwaves. Because it must be done, wasteful energy is consumed for heating.

[0005] It is an object of the present invention to provide an electromagnetic wave heating device which can realize more efficient heating without such disadvantages.

[0006]

According to the present invention, there is provided an electromagnetic wave heating apparatus including an electromagnetic wave generator, a waveguide for guiding electromagnetic waves, and a container for holding an object to be heated, wherein the container is non-magnetic and has low dielectric loss. , And has a downwardly convex shape, is located in the waveguide, the convex direction of the container is arranged to face the direction of the electromagnetic wave, and the shape of the container is conical or pyramidal or wedge Type or bowl type, there is a hole at the end of the container, a hose made of low dielectric loss is connected to the hole,
The hose is drawn out of the apparatus through a waveguide having a cut-off structure from the waveguide at a position below the distal end.

In addition, a low dielectric loss net is placed over the connection of the hose at the bottom of the heating container, or a low dielectric loss net-like inner container is placed inside the heating container to heat the object. It is characterized by putting things in.

[0008]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of an electromagnetic wave heating device showing one embodiment of the present invention. The microwave is guided from the magnetron of the microwave generator 1 to the waveguide 2. The waveguide 2 is arranged vertically, and a microwave output is guided from bottom to top. Waveguide 2
A wedge-shaped container 3 made of resin having a low dielectric loss is placed downward in the middle of the process, and an object 4 to be heated is placed in the container. A hole is opened in the bottom of the container, and a resin drainage hose 6 also made of low dielectric loss is attached. On the other hand, the waveguide 2 has a rectangular cross section, and a hole for passing the drainage hose 6 is formed on a surface including the short side thereof. The position of the hole is below the tip of the heating vessel so as not to prevent the natural fall of water. A waveguide 7 in cut-off mode is attached to the hole so that microwaves do not leak, and the drainage hose 6 is guided out of the apparatus through the waveguide 7 in cut-off mode. The end of the waveguide has a cover of a punching metal 5 that allows gas to pass through but shields electromagnetic waves.

In some cases, it is necessary to cover the end of the container with a mesh-shaped hose lid 8 as shown in FIG.

[0010] Further, by installing the reticulated inner container 9 inside the heating vessel as shown in FIG. 3, the efficiency of draining is increased, and more efficient heating can be realized.

A feature of the present invention is that a drainage drainage channel is provided at the bottom of a low-dielectric-loss heating vessel that is convex downward. The water that seeps out of the object to be heated collects at the tip of the convex shape, but by discharging the water to the outside of the heating vessel through the drainage channel, it is possible to suppress the energy consumption without evaporating by microwaves. In addition, the heating time can be reduced.

[0012]

The use of the electromagnetic wave heating device of the present invention is particularly effective when heating and drying a substance containing a large amount of water, and leads the exuded water to the outside of the device without being evaporated by microwaves. Therefore, the drying time is greatly reduced and the power consumption is greatly reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an electromagnetic wave heating device according to an embodiment of the present invention.

FIG. 2 is a view showing a wedge-shaped container and a mesh hose lid as another embodiment of the present invention.

FIG. 3 is a view showing a wedge-shaped container and a reticulated inner container as another embodiment of the present invention.

FIG. 4 is a diagram showing a structure of an electromagnetic wave heating device having a wedge-shaped container of a comparative example.

FIG. 5 is a diagram showing a structure of a conventional microwave oven.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic wave generator 2 Waveguide 3 Wedge-shaped container 4 Object to be heated 5 Punched metal 6 Drain hose 7 Waveguide in cutoff mode 8 Mesh hose lid 9 Mesh inner container 10 Turntable 11 Applicator

Claims (3)

(57) [Claims] 1. An electromagnetic wave generator, a waveguide for guiding electromagnetic waves, and a container for holding an object to be heated, wherein the container is nonmagnetic, has low dielectric loss, and has a convex shape. And the shape of the container is conical, pyramidal, wedge-shaped, or bowl-shaped, and a hole is formed in the bottom of the container. An electromagnetic wave heating device, wherein a drainage hose made of low dielectric loss is connected, and the drainage hose is led out of the device through a waveguide in a cut-off mode. 2. The electromagnetic wave heating apparatus according to claim 1, wherein a net-shaped lid made of low dielectric loss is provided at a connecting portion of the hose of the heating vessel. 3. The electromagnetic wave heating apparatus according to claim 1, wherein a reticulated inner container made of low dielectric loss is provided inside the heating container, and an object to be heated is put in the inner container.