JPS58175285A - High frequency 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 high-frequency heating device that supplies high-frequency energy into a heating chamber from a slot antenna array consisting of a plurality of P slots for uniform heating, and particularly relates to a dielectric cover that covers the slots. The present invention relates to a high-frequency heating device equipped with a high-frequency heating device.

In conventional equipment, in order to prevent food, etc. from entering the waveguide through the slots, the slots are covered with a dielectric cover with low high frequency loss. Some books were covered with a cover, while others were covered with a small dielectric cover for each slot. The former requires a large amount of dielectric material and is economically disadvantageous. In the latter case, like a general high-frequency heating device that has one high-frequency radiation port, several screws are used for one dielectric cover, so a considerably large number of screw-fastening operations are required for multiple dielectric covers. Therefore, the installation work is time-consuming and, like the former, it is economically disadvantageous.

Therefore, in the present invention, the material of the dielectric cover is minimized,
It is an object of the present invention to provide a high-frequency heating installation that does not require much effort in installation work.

An embodiment of the high-frequency heating device of the present invention will be described below with reference to the accompanying drawings. Fig. 1 is a schematic cross-sectional view of essential parts showing an embodiment of the high-frequency heating device of the present invention. 1 is a high frequency oscillator that generates high frequency energy, and is a waveguide that connects the 2Fi high frequency oscillator 1 to the heating chamber 3. The heating chamber 3 and the waveguide 2 are formed from metal plates. A dinner table 5 is provided at the lower part of the heating chamber 3 on which an object 4 to be heated such as food is placed and rotated.

Slots 1iB1. below and up to λg/16. A slot antenna row (slot array antenna) consisting of two slots 6 and 7 having B2 is provided. Special ±λj
spacing Al, 4 for each A2 up to i or less λg/16, with sut width Bl, B2. A slot antenna array consisting of three slots 6.7.8 with B3 may be provided. JP-A-58-17528 so that the slot 6, which is provided at the tip of the waveguide 2 among the slots 6.7L 8, is close to the center iI9 of the top surface of the heating chamber 5 in the left-right direction with respect to the drawing.
5(2) Select the number of lots. In the above embodiment, the turntable 5 and the slot antenna array are used in the circumferential direction.

This reduces heating unevenness in the radial direction.

In Figure 1 and Figure 2, the slot in the heating chamber peripheral wall 3a) 6,
7.8 are dielectric covers f and a, respectively, such as silicon laminates with low high frequency loss and good flexibility.

7a and ga are installed.

FIG. 3 is a view of the attached state of the dielectric cover 7a of FIG. 1 or 2, seen from inside the heating chamber 3, and FIG. 4 is a sectional view taken from the direction of the arrows XY in FIG. The other dielectric covers 6a and 8a are also attached in a similar manner. The four corners of the dielectric cover 7a are inserted into triangular supporting pieces 1o, which are formed by bending the heating chamber peripheral wall 3a itself to the inside of the heating chamber 3 by the thickness of the dielectric cover 7a, and the four corners of the dielectric cover 7a are inserted into triangular supporting pieces 1o, which are opposite to the long sides of the dielectric cover 7a. The two locations are inserted into the U-shaped support piece 11. Therefore, after insertion, the dielectric cover 7a is in close contact with the heating chamber peripheral wall 5a. When inserting it, simply bend the dielectric cover 7a as shown by the two-dot chain line in Figure 4 and insert it into the support piece 10.11, without using any screws or other parts.

As described above, according to the present invention, the dielectric cover covering the plurality of slots is curved and installed by simply inserting it into each support piece, so the amount of dielectric material can be reduced to a minimum, and the installation work is To provide an economical high frequency heating device that does not require much time and effort.

Furthermore, in the two proposed designs, no screws for attaching the dielectric cover are inserted into the waveguide, so there are no sparks or adverse effects on impedance matching, and stable heating performance can be obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of the main part showing one embodiment of the high-frequency heating device of the present invention, FIG. 2 is a schematic cross-sectional view of the main part showing another embodiment of the present invention, and FIG. FIG. 4 is a cross-sectional view as seen from the direction of arrow XY in FIG. 1... High frequency oscillator, 2... Waveguide. 3... Heating chamber, 3a... Heating chamber peripheral wall. P 6, 7.8...Slot. 6a, 7a, 8a-! l 1 body cover. 10.11...Support piece. Applicant: Hitachi Thermal Appliances Co., Ltd.

Claims (2)

[Claims] (1) A waveguide that connects the high frequency oscillator to the heating chamber. A high-frequency heating device comprising a slot antenna row consisting of a plurality of slots provided at a joint between a heating chamber and a waveguide, a dielectric cover having low high-frequency loss and high flexibility that covers each slot, and the dielectric In order to attach the body cover to the heating chamber circumferential wall, a plurality of support pieces formed from the heating chamber circumferential wall itself are provided, and the dielectric cover is removably attached to the heating chamber circumferential wall by being curved and inserted into the supporting pieces. Features of high-frequency heating equipment. (2) The high-frequency heating device according to claim (1), wherein the support pieces are located at four corners and two opposing long sides of the dielectric cover.