JP3376705B2 - High frequency heating equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency heating apparatus generally called a microwave oven which applies high frequency induction heating mainly to food heating. The present invention particularly relates to a high-frequency heating apparatus having a configuration in which an opening for high-frequency electromagnetic waves is provided behind a heating chamber and the opening is covered with a low-loss dielectric. 2. Description of the Related Art As a method of successfully thawing meat and the like in a heating chamber, a high-frequency electromagnetic wave opening is provided on the rear wall of the heating chamber, and the high-frequency electromagnetic wave is agitated on the waveguide side of the opening. It is well known to provide a stirrer and a rotary mounting table at the bottom of the heating chamber. The opening is provided with an opening cover made of a low-loss dielectric so that hot air in the heating chamber is not transmitted to the high-frequency oscillator through the waveguide. The opening cover is made of heat-resistant glass so that the rotating state of the stirrer can be checked. Further, the rotary mounting table is similarly made of a low-loss dielectric material such as glass so that the central portion of the bottom surface of the object to be heated can be heated as uniformly as the surrounding area. The fitting with the rotary table on which the rotary mounting table is mounted was arranged on the rotary mounting table by providing a circular mountain-shaped ridge on the bottom surface of the rotary mounting table and fitting the rotary table outside the ridge. . In this case, when placing the rotary mounting table on the rotary table, if the rotary mounting table is accidentally slipped into the back of the heating chamber, the ridge at the bottom of the rotary mounting table rides over the fitting portion of the rotary table, and the outer circumference of the rotary mounting table is There is a possibility that the opening cover provided on the rear wall of the heating chamber may be hit, and there is a risk that the opening cover is broken and the user is hurt. [0003] In order to prevent the above-mentioned drawbacks, it is necessary to arrange an opening cover above the rear wall of the heating chamber. Then, when a tall food such as milk or sake can is heated, the upper part is heated more strongly than the lower part, and the uniformity of the upper and lower heating is deteriorated. The present invention is capable of uniformly heating milk, alcohol, etc., and has a configuration in which even if a user accidentally slides the rotary mounting table into the heating chamber, it does not hit the opening cover provided on the rear wall of the heating chamber. It is an object to provide a high-frequency heating device with high safety. According to the present invention, a circular ridge having a circular cross section is provided at the bottom of a rotary mounting table, and a rotary table on which the rotary mounting table is mounted has a fitting portion provided inside the ridge. A flat portion is provided outside the fitting portion. When the rotary mounting table is erroneously slipped on the rear wall of the heating chamber when the rotary mounting table is mounted on the rotary table, the ridge on the bottom of the rotary mounting table is disposed outside the fitting portion of the rotary table, so that heating is performed. On the far side of the chamber, the ridge does not run on the fitting part, and on the entrance side of the heating chamber, the ridge runs on the fitting part. It will hit the underside of the opening cover provided on the wall, and the opening cover will not break. In addition, the rotating mounting table may be broken due to the metal plate that forms the rear wall of the heating chamber, the opening cover, and the heat-resistant and low-loss cushioning material such as silicon rubber provided between the rear wall of the heating chamber. Is safe. In addition, since the opening cover is also provided below the rear wall of the heating chamber, the radiation of high-frequency electromagnetic waves from the rear becomes evenly up and down, so that even high objects to be heated, such as milk and sake cans, can be heated up and down. Become uniform. An embodiment in which the present invention is applied to a home microwave oven will be described. FIG. 1 is a sectional view of one embodiment of the present invention.
At the front of the heating chamber 1 in the main body, a door 2 for taking in and out a heated object (not shown) such as food is provided. On the other hand, a high-frequency oscillator (not shown) is provided on the near side of the waveguide 3 (on the front side of FIG. 1), and high-frequency electromagnetic waves from the high-frequency oscillator pass through the waveguide 3 and form the heating chamber 1. The radiation is radiated into the heating chamber 1 from an opening 5 provided in the wall 4. The opening 5 is provided with an opening cover 6 made of a low-loss dielectric such as glass so that hot air in the heating chamber 1 does not enter the high-frequency oscillator, and made of a heat-resistant low-loss dielectric such as silicon rubber. It is fixed by the cushioning material 7. A stirrer 8 for stirring high-frequency electromagnetic waves is arranged in the waveguide 3 of the opening 5, and is rotated by a stirrer motor 9. A rotary mounting table made of a low-loss dielectric such as glass on which an object to be heated is mounted is disposed at the bottom of the heating chamber, and is mounted on the rotary table 11. The turntable 11 is rotated by a turntable motor 12 provided below the heating chamber 1. Therefore, the object to be heated is uniformly heated by the rotation of the stirrer 8 and the rotary mounting table 10, so that the thawing of sashimi and the like can be performed well. FIG. 2 is an enlarged view of a main part of FIG. A ridge 13 having a circular cross section at the bottom of the rotary mounting table 10 is provided. The ridge 13 is fitted outside the ridge 13 with a fitting portion 14 of the rotary table 11. Rotary mounting table 10
Because the food is heated, the soil is often taken out and washed, and when it is fitted to the turntable 11 again, it may slip into the back of the heating chamber 1 by mistake. At this time, the ridge 13 rides on the fitting portion 11, and the tip at the back of the rotary mounting table 10 jumps upward, hitting the lower end of the opening cover 6, and the opening cover 6 and the rotary mounting table are damaged, so that the user can Could be hurt. A view in which the rotary mounting table 10 is shifted to the back of the heating chamber 1 is indicated by a two-dot chain line. FIG. 3 is an enlarged view of a main part of FIG. A circular ridge 13 having a circular cross section is provided on the bottom surface of the rotary mounting table 10 so as to fit with a fitting portion 14 of the rotary table 11. Even when the rotary mounting table 10 is slid into the rotary table 11, even if the outer peripheral portion of the rotary mounting table 10 erroneously hits the rear wall 4 of the heating chamber 1, the ridge 13 is placed on the fitting portion 14 at the rear side of the heating chamber 1. I will not get on. On the door 2 side, the ridge 13 rides on the fitting portion 14 on the contrary.
The outer peripheral portion on the back side of the heating chamber 1 is lowered and only hits the elastic cushioning material 7 and the rear wall 4 without hitting the opening cover 6 which is vulnerable to impact, so that the rotary mounting table 10 and the opening cover 6 are broken. There is no security. A view in which the rotary mounting table 10 is shifted is indicated by a two-dot chain line. At the same time, the lower end of the opening 5 can be arranged below the rear wall 4 of the heating chamber 1. Since the flat portion 15 is provided outside the fitting portion 14, the ridge 13 is displaced substantially horizontally, so that the rotary mounting table does not drop easily at the bottom of the heating chamber 1. FIG. 4 shows another embodiment in which a heater 16 is disposed in the high-frequency heating apparatus of the present invention so that a heater such as an oven can be heated in the heating chamber 1. When heating with a heater, use a metal oven dish 1 instead of a rotating table.
7 is placed on the rotary table, but the legs 18 of the oven plate 17 can be placed on the flat portion 15 of the rotary table 11, so that the oven plate 17 can be stably fitted. 19 is a heat insulating material of the heater 16. As described above, the present invention has the following advantages. 1) When the rotary mounting table is placed on the rotary table, even if the rotary mounting table is slid into the inside of the heating chamber by mistake, the outer peripheral portion of the rotary mounting table does not jump upward, so the opening cover is provided. It is safe because it does not hit 6. 2) Since the lower end of the opening can be arranged below,
Even a tall object to be heated, such as warmed milk or sake can, can radiate light from the upper and lower portions of the opening, so that the upper and lower portions of the object to be heated are uniformly heated. 3) Since the lower end of the opening can be disposed below, the size of the opening in the vertical direction can be increased. Therefore, the radiation of the high-frequency electromagnetic wave due to the stirring of the stirrer changes greatly, so that heating requiring uniformity such as thawing can be uniformly heated. 4) Even when a heater capable of heating the heater is incorporated in the high-frequency heating device of the present invention, the oven plate can be stably mounted instead of the rotary mounting table on a flat portion provided on the outer peripheral portion of the rotary table. it can.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side cross-sectional view of a high-frequency heating device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a main part of a conventional high-frequency heating device. FIG. 4 is a side sectional view of a high-frequency heating apparatus according to another embodiment of the present invention. [Description of References] 1 Heating chamber 3 Waveguide 4 Rear wall 5 Opening 6 Opening cover 7 Buffer material Reference Signs List 10 Rotary mounting table 11 Rotary table 13 Ridge 14 Fitting part 15 Flat part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05B 6/64 H05B 6/78 F24C 7/02

Claims (1)

(57) [Claims 1] A heating chamber for heating an object to be heated, a high-frequency oscillator for oscillating high-frequency electromagnetic waves, a waveguide for guiding high-frequency electromagnetic waves of the high-frequency oscillator to the heating chamber, the opening of the waveguide provided in the rear wall of the heating chamber, and an opening cover provided in front Symbol opening, and is provided in the heating chamber bottom and placing the object to be heated rotating rotation table A rotary table on which the rotary mounting table is mounted, wherein the rotary mounting table has a substantially circular ridge having a mountain-shaped cross section on the bottom, and the rotary table has a fitting portion fitted inside the ridge and the fitting portion. A flat portion is provided outside the fitting portion, and the rotary mounting table slides into the heating chamber.
When it is inserted, the outer circumference of the heating chamber of the rotary
The rotating mounting table contacts the opening cover.
A high-frequency heating device characterized in that it does not work .