JPS58176896A - Microwave heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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, and in particular, relates to a device that performs microwave heating while conveying an object to be heated 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 from both sides into the applicator to perform heating.

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 (power heat chamber) while moving it, has a rating of 5.
Seven microwave oscillators using relatively large magnetrons with a capacity of kW to 100 kW are used, and a predetermined waveguide is used to oscillator 17 from the front or rear of the abcubator in its longitudinal direction (direction of conveyance of the object to be heated). In particular, large microwave oscillators have a structure that supplies microwaves to the applicator and require a large number of attached devices, making the device extremely expensive.

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, and to efficiently generate necessary and sufficient heating energy within the receiver. 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 briefly described below with reference to the drawings.

FIG. 1 shows a perspective view of a microwave heating device, and / is a tunnel type waveguide type applicator.

A belt conveyor is installed running through the interior in the horizontal direction. 3 and 5 are small microwave oscillators, respectively, which are placed in different opposing positions on both sides of the applicator/, that is, one microwave oscillator 3 is placed on the rear right side of the applicator/, and the other microwave oscillator S is placed on the rear right side of the applicator/. , microwave (for example 2 'l 5 Q MB2 or 9 /
! ; MHz) into the applicator.

The introduction parts G and B have a horn shape as shown in Fig. 3, and the opening 7 connected to the microwave oscillators 3 and 5 has a length of about λ (the wavelength of the microwave used) and a width of about λ. λ/2
．． The opening g connected to the side surface of the applicator is formed into a hollow shape with a length of about λ, a width of about 2λ, and a total length of about 2 inches. 9 is the 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 /, and // is an object to be heated. Note that the microwave oscillators 3 and 5 may be small magnetrons with a rating of about 300 W used in consumer microwave ovens, etc., and may be equipped with an air cooling device. There is no need for isolators or water loads to absorb reflected waves, which were previously required for large magnetrons.

In the microwave heating device configured in this way, while the object to be heated // is moved inside the applicator by the belt conveyor 2, a predetermined wavelength is emitted from one microwave oscillator 3, 5 through the inlet parts q and B. microwaves are fed into/into the applicator to excite the microwaves in/into the applicator in a particular 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 is efficiently heated by receiving this energy. In addition, the introduction part l of the two systems on both sides,
The electric field distribution of the applicator is made relatively uniform by the microwaves supplied from Part B, so that the object to be heated can be heated uniformly without being strongly heated in any particular part. The applicator may be provided separately for each of the seven microwave oscillators, or an auxiliary heating device such as an electric heater may be added.

As shown in F below, according to the microwave heating device of the present invention, small microwave oscillators are installed on both sides of the applicator, and microwaves are applied from these two microwave oscillators through the horn-shaped introduction part. Because it is configured so that it is supplied into the tank, it is possible to use a microwave oscillator that is cheaper and has a smaller rating than conventional devices of this type, and there is no need to install an isolator or water load device to absorb reflected waves. Therefore, the structure of the device can be extremely simplified.

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 drawings show an embodiment of the present invention; FIG. 1 is a perspective view of a microwave heating device, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a perspective view of an introduction section. / Applicator, 2...Belt conveyor, 3゜5 Microwave oscillator, q, Otsu...Introduction. Patent application Toyoda Gosei Co., Ltd.

Claims (1)

[Claims] 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 characterized by being configured such that the two microwave oscillators are arranged at different opposing positions and supply microwaves into the applicator through respective horn-shaped introduction parts. Device.