JP2887504B2 - High frequency heating equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a high-frequency heating device having no heater such as electric heating.

(Prior Art) A conventional high-frequency heating apparatus of this type uses a round plate placed on a turntable, a square plate placed on the bottom of the refrigerator, and a ceramic flat plate formed on the bottom of the refrigerator as a juice receiving tray. . These juice trays are made of a substance or metal having a low dielectric loss coefficient and are designed to suppress heat generation of the juice tray itself.

Further, in a recent example, the turntable itself is formed of a substance having a high dielectric loss as in the invention of JP-A-63-29751, or porous silicon carbide as in the invention of JP-A-62-141772. Some heating elements of the cellomic molded plate try to brown.

(Problem to be Solved by the Invention) The conventional soup tray is made of a substance or metal having a small dielectric loss coefficient and suppresses heat generation of the soup tray itself, so that it can be warmed, but cannot be browned. There was a problem.

Further, as in the invention disclosed in JP-A-63-29751, when the turntable itself is formed of a substance having a high dielectric loss, the temperature of the turntable is always high even when no scorching is required, resulting in a large heat loss. Therefore, the heating efficiency is poor,
Further, since the temperature of the turntable becomes high, there is a problem that food contained in the wrap film for packaging having low heat resistance cannot be heated.

Further, the porous silicon carbide ceramic molded plate of the invention of JP-A-62-141772 and the turntable of the invention of JP-A-63-29751 or a plate covering these are in contact with the food in its entirety, so that the food There was also a problem that when the area was scorched from the surroundings and the central area was moderately scorched, the peripheral area was too scorched and could not be eaten. In addition, because the bottom of the food comes in contact with the heating plate on the entire surface, there is no escape route for the steam coming out of the food,
There was also a problem that the bottom of the food was sticky and no tangled brown was obtained.

The present invention solves the above-mentioned problem, and provides a high-frequency heating device capable of uniformly browning and preventing sticky bottom.

(Means for Solving the Problems) In order to solve the above problems, the present invention comprises a heating chamber for cooking food, high frequency heating means for heating the food, and a door for opening and closing the opening of the heating chamber. In a high-frequency heating device, a non-metal part made of plastic, ceramics, or glass containing a substance that generates heat by high frequency and having a plurality of cuts radiating from the outer periphery is fixed to the center of the metal part in the heating chamber. A flat heating plate configured so that the periphery of the metal portion is one step lower than the periphery of the non-metal portion, and a juice tray formed of a metal or a substance having a small dielectric loss.

(Operation) When cooking is started by the above configuration, the food is heated at a high frequency at the same time as the food is heated, but the heating plate becomes high in temperature. Prevent heating and heat the bottom of the food evenly. In addition, the water vapor generated from the bottom surface of the food escapes from the metal portion that is configured lower than the non-metal portion, and is radiated, resulting in a sharp finish.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS.

1 and 2 are a perspective view of a high-frequency heating apparatus according to a first embodiment of the present invention as viewed from the front, and a perspective sectional view as viewed from the side with a part cut away, and FIG. FIG. 4 is a perspective view of a heating plate and a juice tray according to the present invention.

In FIG. 1, a heating chamber 1 for cooking food is provided with an openable and closable door 2 on a front surface thereof.

2, the heating chamber 1 is provided with an exhaust hole 3 in the left corner, and a humidity sensor 4 is provided outside the heating chamber 1 for automatically setting a cooking time according to a change in humidity of the heating chamber. ing.

As shown in FIG. 3, a rotating shaft of an electric motor 5 is provided in the heating chamber 1.
A turntable 6 fixed to the upper end of 5a is provided, on which a juice tray 7 and a heating plate 8 are placed.
The lower end of the rotating shaft 5a of the electric motor 5 is placed on the weight sensor 9, and detects a change in the weight of the food placed on the turntable 6, and sets the heating time.

Turning to FIG. 4, the heating plate 8 is made of a substance that self-heats by high frequency, and is composed of a non-metal portion 8a with a radial cut from the outer periphery and a metal portion 8b to which the non-metal portion 8a is fixed. Is lower than the non-metal portion 8a.

FIG. 5 is a sectional view of a main part of a heating chamber 1 showing a second embodiment. The difference from the first embodiment shown in FIG. 1 to FIG. On the bottom of 1,
This is the point where the juice receiving tray 7 supporting the heating plate 8 is placed. Others are the same as the first embodiment. Note that the metal juice receiving tray 7 is provided with legs 7a made of an insulating material in order to prevent spark discharge generated between the metal heating chambers 1. If the juice receiving tray 7 is not made of metal, it is not necessary to provide the legs 7a.

The operation of the high-frequency heating device thus configured will be described by taking as an example the cooking of a frozen pizza with a large amount of water.

First, the frozen pizza is placed on the heating plate 8 supported by the juice tray 7, and in the case of the first embodiment, on the turntable 6, in the case of the second embodiment, a juice tray having legs 7a. The door 2 is closed by placing it on the bottom surface of the heating chamber 1 using 7. Next, when cooking is started by operating a cooking button (not shown), the high-frequency oscillator (not shown) absorbs the high-frequency radiation, and the frozen pizza is heated by high-frequency, and the heating plate 8 is also heated by high-frequency. And heats up from the lower surface by heat conduction.

In this case, since the heating plate 8 has more metal portions 8b toward the outer periphery due to the radial cut, overheating of the outer periphery of the frozen pizza is prevented, and the frozen pizza is uniformly heated to form a uniform brown. The water vapor generated from the bottom escapes through the one-step lower metal portion 8b to prevent the bottom from being sticky and to increase the sensitivity of the humidity sensor 4 due to the increased amount of generated steam. Detect and automatically adjust the cooking time to end the cooking. Since a gap is provided between the heating plate 8 and the juice receiving tray 7, heat conduction to the juice receiving tray 7 is small, and therefore, adverse effects on the turntable 6 and the electric motor 5 driving the same are suppressed. Therefore, the durability of the electric motor 5 is not impaired. Further, in the metal juice tray 7, it is possible to adjust the heating temperature of the heating plate 8 by adjusting the distance to the heating plate 8 so as not to be excessively heated, and to prevent over-burning. It is possible.

FIGS. 6 (a) and 6 (b) show a conventional heating plate and a heating plate 8 according to the present invention, which are made of a substance which self-heats by high frequency over the entire surface using a high-frequency heating device of 700 W output constructed as described above. It shows the relationship between the heating time and the surface temperature of the heating plate and the state of stickiness and scorching of the bottom surface of the frozen pizza when used, respectively. The use of the heating plate 8 of the present invention reduces the sticky area. In addition, since there is no partially over-burned area, a good area is increased and a stable cooking result is obtained.

(Effects of the Invention) As described above, according to the present invention, it is possible to impart a sticky, non-sticky brown surface to a bottom surface of a frozen pizza or the like having a high moisture content. Further, the heating plate of the present invention can evenly brown the entire bottom surface of the food.

[Brief description of the drawings]

1 and 2 are perspective views of a high-frequency heating device showing a first embodiment according to the present invention, and perspective cutaway views in which a part of the high-frequency heating device is cut away. FIG. FIG. 4 is a perspective view of a heating plate and a juice receiving tray, FIG. 5 is a sectional view of a main part of a heating chamber of a high-frequency heating apparatus showing a second embodiment, and FIGS. FIG. 4 is a characteristic diagram showing a relationship between a heating time and a surface temperature of the heating plate according to the invention. 1 ... heating chamber, 2 ... door, 3 ... exhaust port, 4 ... humidity sensor, 5 ... electric motor, 6 ... turntable, 7 ... juice receiving tray, 8 ... heating plate, 8a ... non- Metal part, 8b ... Metal part, 9 ... Weight sensor.

Claims (1)

(57) [Claims] 1. A high-frequency heating apparatus comprising: a heating chamber for cooking food; a high-frequency heating means for heating the food; and a door for opening and closing the opening of the heating chamber. A non-metal part made of plastic, ceramics, or glass containing a substance that generates heat and having a plurality of cuts radiating from the outer periphery is fixed to the center of the metal part, and the peripheral part of the metal part is one step higher than the periphery of the non-metal part. A high-frequency heating apparatus comprising: a flat heating plate configured to be low; and a juice tray formed by molding a metal or a substance having low dielectric loss.