JPS5822080Y2 - microwave heating furnace - Google Patents

Description

[Detailed description of the invention] This invention relates to a microwave heating furnace that heats substances using microwaves.

FIG. 1 is a cross-sectional view of a microwave heating furnace according to the prior art.
1 is a microwave generator, 2 is a waveguide, 3 is a microwave oven, 4 is an object to be heated, and 5 is an inner container for accommodating the object to be heated 4, which is made of a material with high heat resistance and high microwave loss, e.g. It is made of sintered material whose main component is zinc oxide.

Reference numeral 6 denotes an outer container accommodating the inner container 5, which is made of a material that is fire-resistant and heat-insulating and has low microwave loss, for example, a JIS A class 7 fire-resistant and heat-insulating brick.

7 is a stand. Next, the operation will be explained.

Microwaves generated by a microwave generator 1 are guided to a microwave oven 3 by a waveguide 2.

At this time, resonant electromagnetic fields of various modes are generated within the microwave oven 3.

Since the outer container 6 has a small microwave loss, the microwave electric field is hardly attenuated, and the inner container 5 is effectively heated.

Since the outer container 6 is made of a heat insulator, the inner container 5
The internal temperature is maintained uniformly at a high temperature of, for example, 1000° C. or higher.

Therefore, the object to be heated 4 placed in the inner container 5 can be uniformly heated to a high temperature even if it is made of a material with low microwave loss, such as ceramics.

The object to be heated 4 that is fired by heating to such a high temperature usually contains a binder, and the binder vaporizes and comes out of the object to be heated 4 during the temperature raising process.

(This process is called binder removal.) This process of binder removal is very important, and if the binder removal is not carried out smoothly, it will not only have a negative effect on the properties of the fired product after heating, but also cause the fired product to become deformed. or even cracks may occur.

However, in the microwave heating furnace according to the prior art described above, the object to be heated 4 is sealed between the inner chamber 5 and the outer container 6, so that the gasified binder coming out from the object to be heated 4 is absorbed into the inner container. 5, it was difficult to perform the binder removal process smoothly.

This invention was made with the aim of solving the above-mentioned problems, and improves ventilation by providing at least one through hole in the circumferential surfaces of the inner container 5 and outer container 6, respectively, and also provides forced ventilation. By applying this, the binder removal process can be carried out smoothly.

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 2, 8a is a through hole provided in the inner container 5;
Reference numeral 8b denotes a through hole provided in the outer container 6, which communicates with the through hole 8a to form the ventilation hole 8.

When such a vent hole 8 is provided, the gasified binder released from the heated object 4 to be heated to a high temperature is exhausted into the microwave oven 3 through the vent hole 8, thereby preventing the binder removal process. This process is carried out smoothly, the properties of the sintered body are not impaired, and a sintered body free from deformation, cracking, etc. can be obtained.

FIG. 3 is a sectional view of another embodiment of this invention, showing the outer container 6.
The through hole 8b provided in the hole 8b is bent.

In this way, the heat rays radiated from the object to be heated 4 and the inner container 5, which is a heating element, are received by the outer container 6, so the amount of heat escaping through the ventilation hole 8 can be reduced, and the heating efficiency is increased accordingly. Not only can you improve your
The maximum temperature that can be heated can also be increased compared to the device shown in FIG.

FIG. 4 shows yet another embodiment of this invention, which aims to reduce loss due to thermal radiation, similar to the embodiment shown in FIG.

In the figure, 6b is the second outer container, and the first outer container 6
It is accommodated with a gap 9 of a and has a through hole 8c provided at a position away from the extension of the axis of the through hole 8b.

With this structure, the heat rays passing through the through holes 8a and 8c are blocked by the second outer container 6b, so that heat shielding can be performed without impairing ventilation. It is possible to heat with higher efficiency and at a higher temperature.

Although each of the above embodiments shows an example in which a through hole is provided on the top surface of the container, the hole is not limited to the top surface, and the through hole may be provided on the side surface or the bottom surface if an appropriate gap is provided. Needless to say, it's a good thing.

In addition, although a shape in which the through hole 8b is bent in the middle is shown, the axis of the through hole 8a provided in the inner container 5 and the outer container 6
The axes of the through-holes 8b may be made to intersect at an appropriate angle, so that the ventilation holes 8 are bent by the through-holes 8a and 8b.

As explained above, this invention is made of a material with high heat resistance and high microwave loss, and has through holes 8a provided on the peripheral surface.
an inner container configured to accommodate a heated object therein; and a material made of a material that is fireproof and heat insulating and has low microwave loss, and configured to accommodate the inner container;
An outer container is provided with a through hole 8b on its circumferential surface that communicates with the through hole 8a of the inner container to form a ventilation hole 8, and this outer container is accommodated, and microwaves are irradiated to the inner container through this. This furnace is equipped with a microwave irradiation device that communicates with the inside of the inner container and the outside of the outer container, so it can perform the debinding process without impairing the heating characteristics compared to the prior art microwave heating furnace. It has the advantage that it can be done smoothly.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the conceptual configuration of a microwave heating furnace according to the prior art, and FIGS. 2 to 4 are sectional views each showing the conceptual configuration of an embodiment of this invention. In the figure, 1 is a microwave generator, 2 is a waveguide, 3 is a microwave oven, 4 is a heated object on the other side, 5 is an inner container,
6.6a, 6b are outer containers, 8 is ventilation hole, 8a, 8b
8c is a through hole, and 9 is a gap. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (4)

[Scope of utility model registration request] (1) A microwave heating furnace equipped with the following (a) to eXu configuration. (a) An inner container made of a material with high heat resistance and high microwave loss, having a through hole 8a provided on the circumference, and configured in a shape that can accommodate the object to be heated inside, (0) Fireproof. It is made of a material that is heat insulating and has a small microwave loss, is configured in a shape that can accommodate the inner container, and has a through hole 8b on its circumferential surface that communicates with the through hole 8a of the inner container to form a ventilation hole. (c) A microwave irradiation device that houses the outer container and irradiates the inner container with microwaves through the outer container. (2) A utility model registration request characterized in that the through-hole 8a provided in the inner container and the through-hole 8b in the outer container are formed in a direction in which the heat rays radiated from the object to be heated cannot directly pass through. A microwave power-rothermal furnace according to scope 1. (3) The microwave heating furnace according to claim 2, which is a registered utility model, in which the direction of the through hole 8b provided in the outer container is inclined at a predetermined angle with respect to the direction of the through hole 8a of the inner container. (4) A practical use characterized in that it has a double outer container, and the through holes ab and 8c provided on the circumferential surface of these outer containers are provided so as to be located on different axes. A microwave heating furnace according to claim 2 of the patent registration claim.