JPS6125199Y2 - - 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 is possible to make the heater move freely along the wall of the heating chamber, but in this case, it is possible to move the heater freely along the wall of the heating chamber. The through hole has no choice but to be rectangular or oval in shape. Therefore, it has been desired to solve the major technical problem of how to effectively prevent leakage of radio waves from the through holes.

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

In the following description of the embodiments, for convenience, a heater is selected as the penetrating body, 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 an 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 metal heating box with two elongated parallel transparent elements formed on the rear wall of the heating box. The length A in the vertical direction of the hole has a dimension equivalent to 5/4 wavelength of the high frequency used.

4 is a sheathed heater (penetrating body) in which terminal portions 5 at both ends are respectively protruded from the through hole 3 to the outside;
It is located inside the through hole 3 and can freely move in this 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 to cover the back side of the through hole 3, which are integrally formed as a whole by press molding. This shielding plate is fixed to the heating box 1 by spot welding at a flange 8 provided around its entire periphery.

Reference numeral 9 denotes a radio wave attenuation chamber formed between the heating box 1 and the shielding plate 7, in which the width C corresponds to 1/4 wavelength of the high frequency, the depth D corresponds to 1/8 wavelength, and the width C corresponds to the 1/8 wavelength of the high frequency wave. The depth E is similarly set to a dimension equivalent to 1/4 wavelength. 10 is the shielding plate 7
The outlet is located in the center of the back of the device, and its length in the vertical direction is set to be several mm longer than one wavelength of high-frequency waves.

11 is the entrance of the radio wave attenuation chamber, and 12 is a metal movable plate with a small hole 13 in the center into which the end of the heater 4 is loosely fitted, and is bent into a U-shape to enclose the shielding plate 7 from the side to the rear. and has a size that always covers the outlet 10 even when moving up and down. 14
is a support plate that connects two moving plates 12, 12. The support plate and the movable plate 12 are held by holding means (not shown) such as rollers and guide rails so as to move vertically up and down while being elastically pressed toward the shielding plate 7.

Reference numeral 15 designates a plurality of leaf springs which are held in advance on the movable plate 12, and the claws 16 formed at both ends thereof are engaged with the small holes 17 of the movable plate 12, and the whole is held in a curved state in which it bulges in the direction of the shielding plate 7. has been done. Further, the leaf spring 15 itself is also curved in the direction of the shielding plate 7 by press molding or the like, as shown by the imaginary line in FIG. The leaf spring 15 is stored in a compressed state between the shielding plate 7 and the movable plate 12.

Reference numeral 18 denotes a support plate 14 surrounding the terminal portion of the heater 4.
It is a circular case made of metal attached to the inside of which forms a radio wave attenuation chamber 19 whose radius F and depth G both have dimensions equivalent to 1/4 wavelength.

In the above configuration, if high-frequency heating 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. On the other hand, by operating the movable plate 12 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.

At this point, the radio wave does not leak much from the outlet 10 due to the effect of the radio wave attenuation chamber 9, but even if it leaks, the leaf spring 15 prevents it from proceeding through the gap between the shielding plate 7 and the moving plate 12. , is attenuated, and its traveling direction is restricted to a direction perpendicular to the long diameter direction of the outlet 10, and therefore, it is further attenuated at both left and right ends of the movable plate 12.

On the other hand, when moving the heater 4, its plate spring 15
This elastic force allows the heater 4 to be moved smoothly with a light force. Furthermore, radio wave attenuation chamber 1
It goes without saying that the radio waves that enter 9 are also annihilated by the so-called chioke effect.

Note that a plurality of leaf springs 15 are used as in the embodiment,
If it is curved, the weight of the leaf spring 15 can be minimized, and a stable contact state can be maintained, but it is obvious that various improvements can be made without being limited to this configuration. spring 15
may be attached to the shielding plate 7 by spot welding or the like.

Note that when the inner wall surface of the heating chamber 2 is coated with tetrafluoroethylene resin to improve cleaning performance, the entire heating box 1 is roughened by shot blasting or the like in advance. In this case, according to this invention, the movement of the moving plate 12 can be maintained smoothly.

By applying this idea as described above and making the heater movable, even if the amount of heat generated by the heater itself is constant, by selecting its position, you can control the heat amount 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 good 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 controls and temperature sensors that directly measure the temperature of the object to be heated inside the heating chamber can also be moved freely. Therefore, it is possible to improve the operability and expand the functions.

Moreover, the radio wave attenuation chamber prevents radio wave leakage, and the simple combination of a movable plate and a leaf spring can be expected to improve the mobility of the penetrator and the radio wave shielding performance, making it highly reliable and effective. This can be a high frequency heating device.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the main part showing an embodiment of this invention, Fig. 2 is a longitudinal cross-sectional view of the main part, Fig. 3 is an enlarged view of the main part of Fig. 1, and Fig. 4 is the main part of the moving plate. FIG. 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, 12 is a moving plate, 15 is a leaf spring, 18 is a case, and 19 is a radio wave attenuation It is a room.

Claims (1)

[Claims for Utility Model Registration] (1) A long and narrow through hole is provided in the wall of the heating chamber, and a penetrating body is inserted into the through hole and supported so that it can freely move in the long axis direction of the through hole. A radio wave attenuation chamber is formed outside the heating chamber so as to surround the penetrating body, and a movable plate that moves integrally with the penetrating body is provided on the opposite side of the heating chamber across the attenuation chamber, A high-frequency heating device characterized in that a metal plate spring is interposed in a compressed state between the movable plate and the outer wall surface of the radio wave attenuation chamber. (2) The high-frequency heating device according to claim 1, wherein a plurality of leaf springs are independently arranged in the longitudinal direction of the through hole. (3) A utility model registered as claimed in any one of claims 1 to 2, characterized in that the leaf spring is forcibly held in a curved state so as to swell toward the movable plate or the radio wave attenuation chamber. high frequency heating device.