JPS60198088A - High frequency heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application: The present invention relates to a radio wave leakage prevention structure of a door of a high frequency heating device.

Structure of the conventional example and its problems The door of the conventional high-frequency heating apparatus shown in FIG. 5 has the following problems.

That is, in order to bring the door frame 14 that forms the cavity into contact with the wall surface 17 surrounding the opening of the heating chamber 15, the door frame 16 is spotted and fixed, thereby performing the first step of preventing radio wave leakage. Slit plate 18 inside the first cavity and the second cavity
The cavity on the heating chamber side is defined as a first cavity, and the slit plate 18b is
The dimension h1 (approximately 10 mm) between the surface and the door frame 16a surface, and the dimension h2 between the slit plate 18b surface and the door frame 14a surface, and this dimension h1. In relation to h2, the second stage of radio wave leakage prevention is performed. Next, the dimension y1 (approximately 7 mm) between the slit plate 18a surface and the door frame 14b surface, and the dimension Y2 (approximately 141 nm) between the slit plate 18b surface and the door frame L/- frame 14b surface, and this dimension y1. The third stage of radio wave leakage prevention is performed due to the dimension of y2. With the above configuration, using the door frame 16,
The shape of the slit plate 18 and the surface of the door frame 16b! :
Since the dimension h1 of the door frame 16 is not accurate due to variations during assembly of the door frame 16, there is a drawback that radio wave leakage cannot be sufficiently prevented. In addition, if the dimension of the cavity is not wide, the slit plate 18 and the door frame 14a,
There are disadvantages such as the visual part of the heating chamber 15 being small because the size of the heating chamber 14b cannot be taken, and the assembly is complicated due to the large number of leakage prevention components, and the cost is also quite high.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to improve the conventional structure and improve radio wave leakage prevention performance.

Structure of the Invention In order to achieve the above object, the high-frequency heating device of the present invention has a cavity formed in the outer circumferential wall of the door frame that comes into high-frequency contact with the wall surface surrounding the front opening of the heating chamber, and a slit plate is provided in the cavity. The door is placed vertically on the main body and is divided into a first cavity and a second cavity, and radio wave leakage is prevented by the dimensional relationship between the shape of the slit in the first cavity on the heating chamber side and the cavity wall on the heating chamber side of the door frame. This has the effect of simplifying the structure and assembly of the door body.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 to 4, a heating chamber 2 with an opening on one side is located inside the main body 1, and a door 4 is attached to the opening of the heating chamber 2 so that it can be opened and closed by operating a handle 3. The main body is located. An object to be heated is placed in the heating chamber 2, and is dielectrically heated by high frequency waves illuminated by a magnetron (not shown).

Next, the main body of the door 4, which is the main part of this configuration, will be explained. The door frame 6 is made of a metal body, has a punching in the center for seeing through the object to be heated, forms the frame of the main body of the door 4, and has a large number of small holes.
In addition, the door frame 6 of the door 4 has a cavity facing the wall surface 7 surrounding the opening of the heating chamber 2, and the cavity A slit plate 5 made of a metal body is provided perpendicularly to the main body of the door 4 inside, and the slit plate 5 divides the inside of the cavity into a first cavity and a second cavity, and the cavity on the side of the heating chamber 2 is divided into a first cavity. and the dimension bl between the door frame wall 6b and the shape of the slit plates 5a and 5b.

b2 and the width a1 of the slit plate 5. -i-10, height 11
.

12, the second stage of radio wave leakage prevention is performed.

In this first cavity, since it is not possible to take a dimension equivalent to a quarter wavelength, in order to reduce the dimension, the slit plate 5 having the shape as shown in FIG.・It stands perpendicularly to the door body toward the 6a surface, and the width a1 and height l of the slit plate 5a! For the surface of 1, the dimension bl from the door frame 6a surface is set (approximately 7 mm to 8 mm from the experimental value), and the dimension b2 from the door frame 6 a surface (experimental value is approximately 14 rnrn to 16 mm),
The dimensional compression with respect to the depth B of the door frame is determined by the following formula.

Changing the shape of the slit plate 5 as shown in Fig. 3 (width a1, a2, height, el, 12) and changing the dimensions b1 and b2 between the slit plate 5 and the door frame wall surface 6a. Therefore, the slit plate 5 for the depth B of the cavity can stop the leakage of radio waves h1 by 19 degrees, and the second cavity dimension C1 can be almost ignored from the experimental value, and it is sufficient if it is at least 3 or more.

In the structure of the door 4 main body described above, banking is applied to the opening of the heating chamber 2 of the door frame 5,
The heating chamber 2 can be seen through, and a polyester film 9 is pasted on the banking part to prevent dust and food particles from adhering to it and to make it easy to clean. The body 10 is fixed to the square hole 12 of the slit plate 5 through the opening 19 of the door frame 5 using the hook part 10a of the door outer body 10. Further, the cavity cover (dielectric) 13 is hooked and fixed to the square hole portion 12 of the slit plate 5 using the hook portion 8a of the cavity cover 8. The door screen 11 is fixed by embedding only both ends of the door screen 11 into the door outer body 10.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) By arranging the free end of the slit plate as described above to face the inner wall surface constituting the cavity of the door frame, and by providing a slit plate with square holes in the vertical wall of the slit plate, the inner wall surface of the door frame Stable radio wave source "leakage prevention performance" can be obtained between the dimensions between and the slit plate.

蓼) There are fewer leakage prevention components and assembly is easier.
Dimensional variations during assembly are reduced, stable radio wave leakage prevention performance is achieved, and costs are reduced.

(3) The dimension C1 of the second cavity can be almost ignored from the experimental results, so at least three questions are required.
Approximately 7 questions) + (y2 (approximately 7 questions) - yl (approximately 7 questions), but in the present invention, bl (approximately 7 questions) + (
b2 (about 14 days) - BL (about 7 questions)) 4-C1 (minimum 3rnnr)
5. The visual field can be made quite large.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a high-frequency heating device that is an embodiment of the present invention, FIG. 2 is a sectional view taken along the line X-X in FIG. 1, and FIG. 3 is a partial perspective view of a single slit plate. FIG. 4 is an exploded perspective view of a main part of a door body of the same device, and FIG. 5 is a sectional view of a main part of a door main body of a conventional high-frequency heating device. 1...High frequency heating device main body, 2...Heating chamber, 4...Door, 5...Slit plate, 6...Door frame , 7... Wall surface around the opening, 8... Cavity cover (dielectric), 9... Polyester film, 10...
...Door outer body, 11...Four door screen 7,1
2... Opening of the slit plate, 19... Opening provided in the door frame. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 5 Figure 4

Claims (2)

[Claims] (1) A heating chamber for storing an object to be heated, a door attached to an opening of the heating chamber so as to be openable and closable, a door frame in high-frequency contact with a wall surface surrounding the opening, and an outer peripheral wall of the door frame. a metal slit plate provided in a cavity formed in the cavity;
The slit plate is divided into a first cavity and a second cavity, the free end of the slit plate is opposed to the inner 19 surfaces forming the cavity of the door frame, and a square hole is provided in the vertical wall of the slit plate. High frequency heating device. (2) Using the square hole of the slit plate, hook the hook part provided on the door outer body, and hook the hook part of the cavity cover into the square hole of the slit plate, and hook the hook part provided on the door outer body. The high-frequency heating device according to claim 1, wherein the door frame and the cabin cover are combined by 1M.