JPH0810628B2 - High frequency heating equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating device that also has an exhaust fan that exhausts indoor smoke and the like to the outside and that heats food by high frequency.

2. Description of the Related Art Generally, as shown in FIGS. 2 and 3, a high-frequency heating device includes a heating chamber 1 for storing food and a high-frequency generator 2 for supplying a high frequency, and the high-frequency generator 2 radiates the heat. The high frequency wave propagates in the waveguide 3 and is radiatively diffused into the heating chamber 1 by the metallic rotating antenna 4 which couples the heating chamber 1 and the waveguide 3 in a high frequency manner to uniformly heat the food or the like. There is.

Further, in order to save space in the interior of a kitchen or the like, a high-frequency heating device that also has an exhaust fan 5 for exhausting oily smoke and the like generated from a cooking table or the like to the outside has a filter 6 that adsorbs and removes oil and dust. Oil smoke or the like is sucked from the provided intake port 7 and discharged to the outside through an exhaust path 8 provided in the main body to ventilate the room.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in such a high-frequency heating apparatus, the antenna motor 9 that rotationally drives the waveguide 3 and the rotary antenna 4 arranged in the exhaust path 8 is removed by the filter 6. Since unclean oil and dust adhere to the product, grease that has been used for a long period of time in the kitchen, etc. has a layer of grease-like oil dust, and the oil that has been carbonized due to the water vapor contained in the oil dust and the exhaust heat from the cooktop. As a result, there is a problem that the inside of the antenna motor 9 and the connection portion with the electric wire 10 are deteriorated in insulation.
When oil vapor or the like enters the joint between the waveguide 3 and the heating chamber wall 11 which are joined to the heating chamber wall 11 by spot welding or the like, carbonization occurs due to the high heat generated by the heat loss of the waveguide 3,
There is also a problem that the carbide is sparked by the high frequency electric field in the waveguide 3 and the waveguide 3 is damaged.

Further, since high-temperature exhaust gas from the cooking table and the like flows in the exhaust passage 8, the temperature of the antenna motor 9 and the electric wire 10 rises, leading to shortened life of the motor bearing portion and deterioration of insulation of the charging portion, resulting in high heat resistance. However, there is a problem in that it becomes expensive by using a highly functional lubricating oil in the bearing portion or by using a highly heat resistant bearing material or an insulating material. Further, it is difficult to completely adhere the joint portion of the waveguide 3 to the wall surface 11 of the heating chamber even from the joining method of spot welding, and the high frequency leaked from this joint portion is introduced from the intake port 7 to the outside of the main body. There was also a problem of being radiated and adversely affecting other electronic devices and the human body.

The present invention solves such a conventional problem, can suppress the temperature rise of the antenna motor and the electric wire with a simple structure, can improve the reliability and the life, and moreover, the antenna motor due to oil dust or the like. The present invention provides an excellent high-frequency heating device that does not cause insulation deterioration of the device and sparks at the joint portion of the waveguide, and that can prevent radio wave leakage from the intake port for ventilation.

Means for Solving the Problems In a high-frequency heating device according to the present invention, a high-frequency wave radiated from a high-frequency generator is propagated in a waveguide and is supplied into the heating chamber by a rotating antenna that couples the waveguide and the heating chamber in a high-frequency manner. A high-frequency heating device that also has an exhaust fan that exhausts oil smoke generated from the cooking table outside the main body, and covers the antenna motor that rotates the rotating antenna and the waveguide with a metal cover, and the exhaust path It is isolated from the exhaust flowing inside, and the end flange of the metal cover is brought into flat contact with the wall surface of the heating chamber along the outer edge of the end flange of the waveguide joined to the wall surface of the heating chamber. .

Function The high-frequency heating device of the present invention covers the antenna motor and the waveguide with a metal cover, and isolates the connection portion of the antenna motor and the electric wire from the high temperature exhaust containing the oil and smoke flowing in the exhaust path to the high temperature exhaust. It protects the antenna motor and electric wires from direct heat exposure to prevent temperature rise, and oil vapor and dust that have passed through the filter adhere to the antenna motor or the junction between the waveguide and the wall of the heating chamber, and the inside of the antenna motor It completely eliminates the deterioration of insulation and sparks due to high frequency at the junction of the waveguide.

Further, since the end flange of this metal cover is in flat contact with the outer edge of the end flange of the waveguide and is in flat contact with the wall surface of the heating chamber, even a slight high frequency leaked from the joint of the waveguide is prevented. Also, it is possible to prevent leakage to the outside of the high frequency heating device.

Example Hereinafter, a high-frequency heating apparatus according to an example of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the antenna motor 9 and the waveguide 3 are covered with a substantially box-shaped metal cover 12. In this embodiment, the end flange 13 of the metal cover 12 is along the outer edge of the end flange 14 of the waveguide 3 which is joined to the heating chamber wall surface 11 by spot welding or the like, and on the heating chamber wall surface 11. It is in plane contact.

In this way, the waveguide 3 and the antenna motor 9 can be isolated from the high-temperature exhaust containing oil smoke and the like flowing in the exhaust path 8, so that the antenna motor 9 and the electric wire 10 can be isolated.
The temperature rise can be suppressed to a low level and reliability and life can be significantly improved. Further, since the filter 6 protects from oil and dust that cannot be removed, insulation deterioration due to oil and dust adhering to the charged portion can be prevented. In addition, if the end flange 13 of the metal cover 12 is brought into plane contact with the heating chamber wall surface 11 as in this embodiment, even fine oil particles, dust, etc. will not penetrate into the inside of the metal cover 12. The contact between the heating chamber wall surface 11 and the end flange 13 can produce a high-frequency shielding effect. In particular, by bringing the metal surfaces into planar contact with each other, it is possible to obtain the same capacitive shielding effect as that of the capacitor formed. Therefore, the high frequency leaking from a slight gap between the end flange 14 of the waveguide 3 and the heating chamber wall surface 11 can be surely shielded by the end flange 13 of the metal cover 12 to improve safety. be able to.

The end flange 13 of the metal cover 12 is the heating chamber wall 11
It is desirable to mount it so as to obtain more contact pressure by pressing it against.

EFFECTS OF THE INVENTION As described above, the high-frequency heating apparatus of the present invention covers the waveguide and the antenna motor with the metal cover when the oil smoke and the like from the cooking table and the like are sucked by the exhaust fan and exhausted to the outside, and its end flange. Is in flat contact with the wall surface of the heating chamber. Therefore, it is possible to isolate the antenna motor and the waveguide from oil and dust in the exhaust path and high-temperature exhaust, so the temperature rise of the antenna motor and electric wire is suppressed and reliability is improved. Therefore, the life of the antenna can be improved, and the deterioration of the insulation of the antenna motor due to oil or dust and the spark at the joint of the waveguide can be eliminated. Further, according to the present invention, the end flange of the metal cover can surely shield the high frequency leaked from the joint portion of the waveguide, which is extremely advantageous for safety.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view of a main part of a high-frequency heating apparatus according to an embodiment of the present invention, FIG. 2 is a front sectional view of a conventional high-frequency heating apparatus, and FIG. FIG. 1 ... Heating chamber, 2 ... High frequency generator, 3 ... Waveguide,
4 ... Rotating antenna, 5 ... Exhaust fan, 6 ... Filter, 7 ... Intake port, 8 ... Exhaust path, 9 ... Antenna motor, 10 ... Electric wire, 11 ... Heating chamber wall, 12 ... Metal cover, 13 …… End flange, 14 …… End flange.

Claims (1)

[Claims] 1. A heating chamber for storing food in a main body for heating and cooking, a high frequency generator for supplying a high frequency to the heating chamber, and a waveguide for guiding the high frequency from the high frequency generator to the heating chamber. A rotary antenna that couples the waveguide and the heating chamber in a high frequency manner; an antenna motor that rotationally drives the rotary antenna; and an exhaust fan for exhausting oil smoke and the like generated from a cooking table or the like outside the main body, An intake port for sucking the oily smoke or the like through a filter, an exhaust path for guiding the oily smoke or the like, and a metal cover for covering the antenna motor and the waveguide are provided, and the metal cover includes the antenna motor and the waveguide. The end flange of the metal cover is separated from the exhaust flowing in the exhaust path, and the end flange of the waveguide is joined to the wall surface of the heating chamber by spot welding or the like at the outer edge of the end flange of the waveguide. Utotomoni, construction and high-frequency heating apparatus for planar contact with the wall surface of the heating chamber.