JPS6021918Y2 - High frequency heating device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a high-frequency heating device equipped with a penetrating body that penetrates the wall surface of a heating chamber.

Conventionally, there has been provided a high-frequency heating device in which, for example, a terminal portion of a rod-shaped heater is led out to the outside through a circular hole provided in a wall of a heating chamber, and this lead-out portion is driven to rotate the heater. .

However, since the rotation range of the heater is narrow, it may not be suitable for actual cooking, so it may be possible to make the heater move freely along the wall of the heating chamber, but in this case, The through hole has to have a shape close to a rectangle or an oval, so it has been desired to solve the major technical problem of how to effectively prevent leakage of radio waves from the through hole.

This invention is intended to meet such demands and provide an effective and reliable means for preventing radio wave leakage.

Note that in the following description of the embodiments, a heater will be chosen as the penetrating body for convenience, but it goes without saying that the same radio wave leakage prevention effect can be obtained with other types of penetrating bodies.

Below, this invention will be explained with reference to one embodiment shown in the drawings. 1 is a metal heating box with a heating chamber 2 inside which is irradiated with high frequency waves, and 3 is a transparent transparent box formed in two longitudinally elongated lines on the rear wall of the heating box. The hole has a vertical length equivalent to 3/4 wavelength of the high frequency used.

Reference numeral 4 denotes a sheathed heater (penetrating body) having terminal portions 5 at both ends protruding from the through hole 3 to the outside, and is located within the through hole 3 so that it can freely move in the vertical direction.

Reference numeral 6 denotes a metal partition plate, and 7 a metal shielding plate in the form of an open front case provided so as to cover the back side of the through hole 3, and the whole is integrally formed by press molding.

However, the lever shield plate has a flange 8 provided on its entire periphery.
The part is in contact with the partition plate 6, and in this state, it is supported so as to be able to move freely in the vertical direction, and has dimensions such that it always covers the rear of the through hole 3 even if it moves up and down. .

The terminal portion 5 of the heater 4 is fitted into the outlet 10 provided in the center of this shielding plate.

14 is a through hole formed in the center of the partition plate 6 with a size corresponding to the through hole 3, 9 is a radio wave attenuation chamber formed between the partition plate 6 and the shielding plate 7, and the room width W is the width of the used high frequency. Set to correspond to 1/2 of the fundamental wavelength, and the same depth is 1/8 of that.
It is set to correspond to the wavelength.

11 is an entrance of the radio wave attenuation chamber, and 12 is an attenuation body, which is formed by forming narrow slits 13 with a width G at a predetermined interval H in a metal plate.

Note that the length 1 of the slit 13 is 20 to 3 lengths.

In the above configuration, when high-frequency heating of gold is performed, radio waves tend to leak to the outside from the through hole 3, but this invention can eliminate such radio waves because the radio wave attenuation chamber 9 is provided.

In other words, since the width W of the attenuation chamber 9 is equivalent to 1/2 wavelength, the radio waves entering from the entrance 11 disappear due to the so-called choke effect, but in reality, the radio waves entering from the entrance 11 have vertical propagation. component and a lateral propagation component,
It has been found that the choke effect in the attenuation chamber 9 is insufficient unless the vertical component is blocked because the radio waves propagate in the direction in which both of them are combined.

Therefore, by providing the attenuation chamber 12 as in this invention, the propagation component in the direction across the slit 13, that is, in the vertical direction, can be restricted, and it is possible to substantially reduce the propagation component only in the lateral direction.

Therefore, in the embodiment, the radio waves can be effectively canceled out and extinguished.

On the other hand, by operating the shielding plate 7 to arbitrarily select the height of the heater 4 and energizing it, the heating power for the object to be heated can be determined by the set height.

If we apply this idea and make the heater movable as described above, even if the amount of heat generated by the heater itself is constant, by selecting its position, we can control the amount of heat over a wide range from high to low heat for the object to be heated. Therefore, there is an effect that heating can be performed with high thermal efficiency and with a heating power suitable for the object to be heated.

Furthermore, in addition to the heater, if this idea is applied, penetrating bodies such as operators and temperature sensors used to operate the heated object installed in the heating chamber or directly measure its temperature can be moved freely. It is possible to improve the operability and expand the functions.

Furthermore, since the radio wave attenuation chamber is provided so as to surround the penetrating body, and an attenuation body is provided to further enhance the attenuation effect, a reliable attenuation effect can be expected.

In addition, since radio wave sealing is not performed by bringing a spring or the like into contact with the penetrating body, the penetrating body can move smoothly and the desired radio wave attenuation effect can always be expected even after long-term use, which is a heavenly effect in practical terms. be.

Note that the structure of the damping body is not limited to the above embodiment, and various modifications and improvements can be made.

For example, it may be a plastic plate coated with a conductive film in the form of a comb, or a metal plate bent into a corrugated shape.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the main part showing one embodiment of this invention, Figure 2
The figure is a longitudinal sectional view of the main part thereof, and FIG. 3 is a perspective view of the main part showing one embodiment of the damping body. In the figure, 2 is a heating chamber, 3 is a through hole, 4 is a heater (penetrating body),
7 is a shielding plate, 9 is a radio wave attenuation chamber, and 12 is an attenuation body.

Claims (2)

[Scope of utility model registration request] (1) An elongated through-hole is provided in the wall surface of the heating chamber, and a through-hole is inserted into the through-hole and supported so as to be freely movable in the longitudinal direction of the through-hole. A shielding plate is provided so as to surround the body, and this shielding plate is provided integrally with the penetrating body, and an attenuation chamber is provided inside the shielding plate and is in constant radio communication with the through-hole, and furthermore, the interior of this attenuation chamber is A high-frequency heating device is provided with an attenuation chamber that regulates radio wave propagation components in a predetermined direction. (2) The high-frequency heating device according to claim 1, wherein the attenuator is a conductive plate with regular slits.