JPS6021916Y2 - High frequency heating device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a high-frequency heating device equipped with a movable heater within a heating chamber.

Conventionally, it is known that a heater is provided with a through hole in the wall of the heating chamber and the heater is rotatably supported at both ends of the through hole. The drawback was that it could not be heated.

This invention eliminates these conventional drawbacks.

This invention will be described below with reference to one embodiment shown in the drawings. Reference numeral 1 denotes a heating device main body, which is comprised of an outer case 2, a bottom plate 3, and a heating box 4 with an open front surface.

5 is a heating chamber formed inside the heating box 4; 6 is the heating box 4;
7 is the door, 8 is a metal turntable that is removably placed on the pedestal 10 to which the rotational force of the motor 9 is transmitted, 11 is the left and right side of the heating chamber 5. A convex portion integrally protruding from the side wall, 12 a mounting plate on which the peripheral edge is placed on the convex portion as necessary, and 13 two long parallel through holes formed in the rear wall of the heating chamber 5. The length A is set to be approximately three times the 1/4 wavelength of the high frequency used, and the width is set to be slightly larger than the diameter of the heater 14, which will be described later.

14 and 15 are heaters such as sheathed heaters, the upper heater 14 is provided so that the terminal portion 16 passes through the through hole 13 and comes out to the outside, and the lower heater 15 is similarly installed in the heating chamber 5.
A terminal portion passes through the rear wall surface of the socket 17 and is inserted into the socket 17 to be connected to a power source.

18 is a metal partition plate attached to surround the entire periphery of the hole edge of the through hole 13; 19 is a metal shield plate attached to the rear wall of the heating chamber 5 to cover the rear of the through hole 13; The depth C around the entire circumference surrounding the through hole 13 is approximately 1 of the high frequency wavelength.
A choke chamber 20 is formed having a length of 1/4 and a width B several fractions shorter than 1/4 wavelength.

Reference numeral 21 denotes an entrance to the choke chamber, 22 corresponds to the through hole 13 on the rear surface of the shielding plate 19, and the length D is also the same as that of the through hole 13. 23 denotes a roller 2 provided at both the upper and lower ends, respectively.
4 is a metal mounting plate with a U-shaped cross section supported movably in the vertical direction, and has a length that sufficiently covers the rear surface of the shielding plate 19 with a predetermined gap S even if it is moved vertically; It has a width.

25 is a roller holder, 26 is a radio wave absorber attached to both left and right ends of the mounting plate 23 so as to face the shielding plate 19 with a gap in between, 27 is a guide plate serving as a guide rail for the roller 24, and 28 is a mounting plate 23 Two through holes are provided in the heater 14, and the end portion of the heater 14 passes through these through holes.

Reference numeral 29 denotes two circular metal cases attached to the mounting plate 23 corresponding to the through holes 28, each having an inner diameter set to approximately 1/2 wavelength, and having a choke chamber 31 having an inlet 30 between it and the mounting plate 23. is forming.

Reference numeral 32 denotes a reflector plate made of a metal plate such as stainless steel, which is attached above the heater 14 via an insulator 43, and has a size that covers the entire upper part of the heater 14, and has a reflector plate in the center that extends directly above the heater 14. In addition to forming a supply port 33, the entire surface is coated with black enamel or paint.

Reference numeral 34 denotes a covering part formed in series with the rear edge of the reflector plate 32, and its width is as large as possible, and its length in the vertical direction is as shown in the figure when the heater 14 is positioned at the upper limit of its movement range. The dimensions are set in advance so as to cover the entire front surface of the through hole 13 with a predetermined gap.

44 is a cover that covers the supply port 33, 35 is an inlet provided at the center of the ceiling surface of the heating chamber 5, 36 is a waveguide that guides high frequency waves to this inlet, and 37 is an exhaust provided at the upper side of the heating chamber 5. The hole 38 is an exhaust duct which has one end connected to the outside of this exhaust hole and the other end opening that passes through the outer case 2 and communicates with the outside.The inside has an exhaust duct that detects the temperature of the exhaust gas exhausted by natural convection. A temperature detecting section 39 of a temperature regulator (not shown) is provided to control energization of the heaters 14 and 15 and maintain the inside of the heating chamber 5 at a desired set temperature.

40 is an exhaust hole located above the mounting plate 23 and provided in the outer case 2; 41 is an intake hole also located below the mounting plate 23 and provided in the bottom plate 3; 42 is a port for directing the generated steam to the heating chamber 5.
It is a spout that supplies water inside.

With the above configuration, if the position of the heater 14 is set by raising or lowering the mounting plate 23 by all external operations, and if both or one of the heaters 14 and 15 is energized, for example, the object to be heated can be burnt. In addition to being able to perform eye-catching cooking, by setting the operating temperature of the temperature detection section 39, a desired ambient temperature can be obtained, and oven cooking and fermentation can be performed.

Furthermore, if high frequency waves are irradiated in this state, it can be heated from the inside, and in combination with external heating by the heaters 14 and 15, it can be heated and cooked quickly and uniformly.

During such high-frequency heating, high-frequency waves tend to leak to the outside from the through-holes 13, but in this embodiment, the high-frequency waves that come out of the through-holes 13 first enter the choke chamber 20 and are extinguished there. High frequency that does not disappear is long hole 2
2, the high frequency wave enters the choke chamber 31 and disappears, or exits through the gap S and is absorbed by the radio wave absorber 26.

Further, since power is supplied to the terminal portion 16 of the heater 14 outside the choke chamber 31, problems such as generation of sparks due to high frequency in the power supply portion and noise entering the power source side can be prevented.

On the other hand, the reflection plate 32 can increase the amount of radiant heat directed downward.

In addition, since the reflective plate 32 is covered with a black coating, discoloration and stains such as oil scattered from food etc. are not noticeable even after long-term use, and sparks etc. do not occur on the surface even when irradiated with high frequency waves. It is possible to increase the heat radiation efficiency.

Furthermore, since the covering part 34 is provided integrally with the reflecting plate 32, the amount of high-frequency irradiation, steam, and hot air entering the through hole 13 can be reduced in advance, and the heater 14 is always
Since the through hole 13 is covered with a cover at the bottom, dirt such as oil that is scattered during cooking can enter the choke chamber 20 etc. from the through hole 13 and adhere to it, resulting in poor insulation, poor contact, corrosion, etc. can be prevented from occurring.

The covering part may be brought into contact with the inner surface of the heating chamber 5, or the covering part may be brought into contact with the heating chamber 5 through a heat-resistant material having a low coefficient of friction and poor thermal conductivity. .

As described above, according to this invention, since the heater can be moved in the vertical direction, it is possible to uniformly heat the entire object to be heated such as food, and by changing the relative distance from the heater, the amount of heat given even with the same calorific value. Since it is possible to subtly change the value, it is possible to improve usability and expand the range of use compared to the conventional method.

Furthermore, the reflective plate not only provides high thermal efficiency, but also prevents hot air, dirt, steam, etc. from entering the heater lead-out part, so there is no deterioration in the insulation of the power connection part, and materials are selected to take measures against heat. Since there is no need to consider the addition of cooling means or the like, there is an effect that a highly safe high-frequency heating device can be provided at a low cost.

[Brief explanation of drawings]

The figure is a partially cutaway side view of a high-frequency heating device showing an embodiment of this invention. In the figure, 5 is a heating chamber, 13 is a through hole, 14.15 is a heater,
16 is a terminal part, 20 is a choke chamber, 32 is a reflection plate, 34
is a cover.

Claims (1)

[Scope of utility model registration request] A heating chamber having a vertically long through hole in a wall surface, a heater disposed within this heating chamber and having a terminal portion led out from the through hole to the outside, and a heater disposed above and below this heater and fixed thereto. and a radio wave leakage prevention means such as a choke chamber provided outside the heating chamber corresponding to the through hole,
The heater is configured to be vertically movable with its end passing through the through hole, and a cover portion that covers the front surface of the through hole is integrally formed on the peripheral edge of the reflecting plate. High frequency heating device.