JPS6155236B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that performs microwave heating while conveying an object to be heated using a conveyor or the like in a tunnel type waveguide applicator. The present invention relates to a microwave heating device that is installed on both sides of an applicator with opposing positions shifted, and uses a horn-shaped introduction part to supply microwaves into the applicator from both sides to heat the applicator.

Conventionally, for example, equipment that heats and vulcanizes a continuous object to be heated, such as rubber, by conveying it continuously to a tunnel-type applicator (heating chamber) while moving it, is a relatively large device with a rating of 5kW to 10kW. A microwave oscillator using a magnetron is used to supply microwaves into the applicator from the front or rear of the applicator in its longitudinal direction (direction of conveyance of the heated object) using a designated waveguide. In particular, large-sized microwave oscillators have a large-sized microwave oscillator and are expensive due to the large number of attached devices, resulting in an abnormally high cost of the device.

The present invention focuses on the above points, and makes it possible to manufacture an inexpensive and simple-structured device using a relatively small consumer microwave oscillator, while also efficiently transferring necessary and sufficient heating energy into the applicator. The purpose of the present invention is to provide a microwave heating device that can be used for heating.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a perspective view of a microwave heating device,
1 is a tunnel type waveguide type applicator,
A belt conveyor 2 is installed extending through the interior in the longitudinal direction. 3 and 5 are small microwave oscillators, respectively, which are placed at different opposing positions on both sides of the applicator 1, that is, one microwave oscillator 3 is placed on the rear right side of the applicator 1, and the other microwave oscillator 5 is placed on the rear right side of the applicator 1. , is attached to the front left side of the applicator 1 so as to supply microwaves (for example, 2450 MHz or 915 MHz) into the applicator 1 through horn-shaped introduction parts 4 and 6. The introduction parts 4 and 6 have a horn shape as shown in FIG. 3, and the opening 7 connected to the microwave oscillators 3 and 5 has a vertical length of approximately λ (the wavelength of the microwave used).
The width is about λ/2, the opening 8 connected to the side of the applicator 1 has a length of about λ, a width of about 2λ, and a total length of about 2
It is formed into a hollow shape so that the angle is λ. 9 is an antenna of the microwave oscillator 3; 10 is a filter for preventing radio wave leakage provided at the openings at both ends of the applicator 1; and 11 is an object to be heated. Note that the microwave oscillators 3 and 5 may be small magnetrons with a rating of about 500 W used in consumer microwave ovens, etc., and equipped with an air cooling device. Therefore, there is no need for isolators or water loads for absorbing reflected waves, which are required for large magnetrons.

In the microwave heating device configured in this way, while the object to be heated 11 is moved inside the applicator 1 by the belt conveyor 2, a predetermined amount of heat is transmitted from the two microwave oscillators 3 and 5 through the introduction parts 4 and 6. microwaves of a wavelength are supplied into the applicator 1;
Microwaves are excited in the applicator 1 in a specific mode. In this state, the microwaves output from the two oscillators are excited within the applicator without interfering with each other, and the object to be heated 11 receives this energy efficiently and is heated. In addition, the electric field distribution of the applicator 1 is made relatively uniform by the microwaves supplied from the two introduction sections 4 and 6 on both sides, so that the object to be heated is not heated strongly in a specific part. Uniform heating can be performed.

Note that the applicator 1 may be provided separately for each microwave oscillator, or an auxiliary heating device such as an electric heater may be added.

As described above, according to the microwave heating device of the present invention, small microwave oscillators are installed on both sides of the applicator, and microwaves are transmitted from these two microwave oscillators to the applicator through the horn-shaped introduction part. Because it was configured to be supplied within
Compared to conventional devices of this kind, it is possible to use a microwave oscillator that is cheaper and has a lower rating, and there is no need to provide an isolator or water load device for absorbing reflected waves, which greatly simplifies the structure of the device. I can do it. Further, since microwaves are supplied from both sides of the applicator, the electric field distribution within the applicator is made more uniform, and the object to be heated can be heated uniformly.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, and FIG. 1 is a perspective view of a microwave heating device, and FIG. 2 is an A-A in FIG. 1.
The sectional view and FIG. 3 are perspective views of the introduction section. 1...Applicator, 2...Belt conveyor,
3, 5...Microwave oscillator, 4, 6...Introduction.

Claims (1)

[Claims] 1. In a microwave heating device that heats an object by supplying microwaves into the applicator while conveying the object to be heated inside a tunnel-type waveguide applicator, a small microwave oscillator is installed on both sides of the applicator. Microwave heating is characterized in that the two microwave oscillators are arranged at different opposing positions, and configured to supply microwaves from the two microwave oscillators into the applicator through respective horn-shaped introduction parts. Device.