JPS6030079B2 - High frequency heating device - Google Patents

Description

[Detailed Description of the Invention] The present invention includes a heater for performing oven cooking, for example, in a heating chamber, and an end of the heater is led out from a through hole provided in a wall of the heating chamber. The invention relates to a high-frequency heating device equipped with a penetrating body.

In the prior art, no high-frequency heating device has been provided in which a heater is passed through an elongated through-hole and the heater is moved in the longitudinal direction of the through-hole.

This is because, although this configuration has the advantage that, for example, if the penetrating body is a heater, it is possible to delicately control the firepower for food, etc., it has the serious problem that a large amount of high frequency waves leak to the outside from the through hole. This is because there are serious risks. The present invention aims to prevent high frequency leakage in such cases with an effective and simple configuration, thereby eliminating various drawbacks of the conventional devices.
The present invention will be explained below with reference to the illustrated embodiments. 1 is a metal heating box with a heating chamber 2 inside; 3 is two elongated and parallel through holes formed in the rear wall of the heating chamber 2; The length B is set to be an odd multiple of 1'4 of the fundamental wavelength of the high frequency used.

For example, in the example, 1/4 as a high frequency of 2450MHz
Since the wavelength is 3.06, it is 5 times this, 15.3cm.
It is set to . 4 is a U-shaped sheathed heater whose terminal portions at both ends are guided out of the heating chamber 2 through the through hole 3, and the diameter A is 7 mm assuming that the width of the through hole 3 is 1 C.
It is set to about the side.

Reference numeral 5 denotes a metal partition plate provided along the entire circumference of the hole edge of the through hole 3, and the depth dimension G is approximately 1 degree.

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

This shielding plate has a flange 7 provided around its entire circumference fixed to the heating box 1 by spot welding. 8 is a radio wave leakage prevention chamber formed between the heating box 1 and the shielding plate 6;
The width F from the center of the heater 4 is 1 of the fundamental wavelength of the high frequency used.
/4, and the height E from the mouth edge of the lead-out row 0, which has a length ○ with a length of about 13' in the center of the shielding plate 6, is also about 3 sides shorter than the fundamental wavelength of 1'4. 〈, that is, 27
It is about the size of a willow tree.

Heater 4 covers the range of J shown in the figure (approximately 123 side) by 1
Since it moves while being held at a position equal to / snakeskin length (approximately 3 arcs), it can be set to five positions.

Note that the depth C of the radio wave leakage prevention chamber 8 is set to 1.5 cm, which is about 1/8 of the fundamental wavelength.

Reference numeral 9 indicates an entrance to the radio wave leakage prevention chamber 8, and reference numeral 11 indicates small recesses provided at predetermined intervals in the flange 7 of the shielding plate 6. High-frequency waves are transmitted to the outside through the gap S formed between the small recesses and the heating box 1. The dimensions are preset to prevent leakage.

Reference numeral 12 denotes a metal movable plate that holds the terminal portion of the heater 4, and is dimensioned so that it always covers the lead-out row 0 even when it moves up and down.

Note that, although not shown, a magnetron for supplying high frequency waves into the heating chamber 2 is naturally provided.

In the above configuration, if high-frequency heating is performed now, high-frequency waves tend to leak from the through hole 3, but as a result of experiments, if the length B of the through hole 3 is a dimension equivalent to an odd multiple of 1/the length of the deaf skin, this through hole 3 will leak. It was found that the amount of leakage high frequency waves passing through the hole was small.

By the way, the length B of the through hole 3 is 1 like the J dimension (123 ribs).
It has been found that when the setting is close to the wavelength (122.4 side), that is, an even number multiple of 1/4 skin length, the amount of leaked high frequency increases. Furthermore, if the length ○ of the lead-out row 0 is made the same as the length B of the through hole 3, the amount of high frequency waves leaking from the through hole 3 will increase without entering the radio wave leakage prevention chamber 8 and leaking to the outside as it is. I understand. Therefore, by setting the dimensions of each part as in this embodiment, in addition to having the advantage of having a high effect of preventing high-frequency leakage, the hot air in the heating chamber 2 is less likely to leak to the outside through the through hole 3, and when heating by the heater 4, In addition to increasing thermal efficiency, the moving plate 12 allows the outlet port 1 to be
Closing 0 becomes more advantageous as its derived row 0 is smaller. This leads to the effect that heat loss can be reduced when steaming food using forced steam in the heating chamber 2, oven cooking, and constant temperature heating treatment. In the embodiment described above, the heater 4 itself is a penetrating body, but the penetrating body may be a lead wire to this heater, or, for example, if the heating chamber is
It is clear that the support shaft of a partition that partitions into more than one room may also be used.

As described above, according to the present invention, a penetrating body such as a heater is led out from a through hole and is configured to be movable in the vertical direction of the through hole, and a radio wave leakage prevention chamber is provided outside the through hole. A shielding plate is provided, and a heater is inserted into the outlet formed in this shielding plate, so that the high frequency waves leaking from the through-hole can be extinguished on the way to prevent it from leaking to the outside, and the diameter of the through-hole can be reduced. Since the outlet port is formed smaller than that of the electromagnetic wave leakage prevention chamber, leakage high frequency waves are easily introduced into the radio wave leakage prevention chamber, thereby achieving the effect that high frequency leakage can be reduced.

Therefore, according to the present invention, the parallel movement of the penetrating body, which was previously considered impossible, can be safely performed, so that various great advantages such as diversification of heating modes and higher efficiency can be obtained by utilizing the present invention.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part of a high-frequency heating device showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a main part thereof. In the figure, 1 is a heating chamber, 3 is a through hole, 4 is a heater, 6 is a shielding plate, 8 is a radio wave leakage prevention chamber, and 10 is an outlet. Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1. A through hole is provided in the wall surface of the heating chamber to which high frequency waves are irradiated, and a penetrating body such as a heater is provided in the heating chamber so as to pass through the through hole, and the through hole is provided outside the heating chamber. A shielding plate is provided to surround the outside of the heating chamber, a radio wave leakage prevention chamber is provided between the shielding plate and the heating chamber, and an outlet is provided in the shielding plate corresponding to the through hole, and the penetrating body The high frequency device is configured to be located between the outlet and the through hole so as to be movable in a predetermined direction, and the diameter of the through hole in the moving direction of the penetrating body is set larger than that of the outlet. heating device. 2. The high frequency heating device according to claim 1, wherein the diameter of the through hole in the moving direction of the penetrating body is larger than or equal to the fundamental wavelength of the high frequency used. 3. Any one of claims 1 to 2, characterized in that the diameter of the through hole in the moving direction of the penetrating body is set to be approximately an odd multiple of 1/4 of the fundamental wavelength of the high frequency used. The high frequency heating device described.