JPS60245931A - High-frequency heating equipment - Google Patents

Abstract

PURPOSE:To miniaturize the titled device by a method wherein the opening of choke groove, provided at the peripheral rim of a door, is provided between the outer plate and inner plate of the door and a recess is provided on the inner plate of the door toward the outer plate. CONSTITUTION:The inner plate 28 of the door 27 contacts with the front plate 23 of a heating chamber 20 at the periphery of the opening thereof and the central part thereof is provided with the recess 29 at a position having substantially the same dimension as the dimension H of the opening of a front plate toward the outer plate 30 of the door 27 for the heating chamber 20. The end face of the outer plate 30 is bent into L-shape to form a peripheral structure such as a slit or the like and the inner and outer plates 28, 30 are welded while the chock groove 31 and the opening of the choke are provided between both plates 28, 30 and a cover 32 is provided. Accordingly to this constitution, the dimension of choke of the door may be reduced, the height of the door as well as a product may be reduced whereby the device may be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the structure of a heating chamber and a door of a so-called microwave oven that radiates high frequency waves into the heating chamber to cook an object.

Conventional configuration and its problems The configuration of the heating chamber of a conventional microwave oven is to heat acid,
Usually, an inverted U-shaped side plate, a top plate, a back plate, etc. were attached to the outside of the heating chamber.

However, in recent years, as microwave ovens have become cheaper and more compact, products have been developed in which a part of the heating chamber is used as the main body, an example of which is shown in FIG.

On the other hand, the structure of a conventional microwave oven door includes a door casing, a door inner plate in contact with the heating chamber opening peripheral plate, a chalk partition plate that forms a chalk around the periphery of the door and attaches the door inner plate, and It was common to use a choke cover with low dielectric loss to seal the choke opening.

On the other hand, in recent years, some microwave ovens have been designed in such a way that a recess is provided from the heating chamber in the door, and a transparent body is also placed on the outside of the door casing. An example is shown in FIG.

In FIG. 1, a heating chamber 1 includes an upper plate 2. U-shaped side plate 3
a, a bottom plate 3b, a front plate 4, and a back plate 6 that serves both as the back plate of the heating device body and the back plate of the heating chamber. On the outside of the heating chamber 1, an inverted U-shaped side plate, a top plate 6, and a main body bottom plate 7 are attached.

A dish holder 10 is provided on the inner bottom plate 3b of the heating chamber.

Next, the configuration of the door 11 will be explained. An inner plate 12 made of a metal plate having a large number of punched holes is in contact with the front plate 4 around the opening of the heating chamber 1, and the central part is at a position approximately the same as the opening dimension H of the front plate 4 of the heating chamber 1. A recess 13 is formed toward the outside of the heating chamber 1. The inner plate 12 and the outer plate 14 of the door 11 are welded together, and an L-shaped periodic body (see Japanese Patent Application No. 46-47063) or the like is further welded to the periphery of the inner plate 12 to obtain a periphery choke dimension C. As the size of the door is reduced, the size of the door is also reduced. (D10H+2G) A choke cover 16 is provided in the choke groove portion 15. On the other hand, a transparent plate 17 is fixed to the front surface of the door 11, and a transparent sheet 18 is attached to the inner surface.

In the above configuration, the back plate 5 of the heating chamber 1 also serves as the back plate of the main body, which contributes to cost reduction and compactness. However, in this method, the inner plate 1 on the inner surface of the door 11
2 is effectively utilized as the front and back dimensions of the heating chamber 1. However, when trying to make the external height of the product compact, there is a limit to the choke dimension C, and in turn, there is a limit to the external height of the product. there were.

In order to eliminate these drawbacks, as shown in Fig. 2, a radio wave absorber such as ferrite rubber is placed on the satush 8 on the outer periphery of the door 11, and instead of two choke spaces as shown in Fig. 1, one If two choke spaces are provided in the thickness direction of the door, the choke dimension C2 of the door can certainly be reduced, and the height dimension D2 of the door 11 can also be reduced. Moreover, the external height dimension L2 of the product can also be reduced.

However, the thickness of the door is regulated by the choke dimension (λ/4) and becomes thicker, so if we try to make the depth dimension of heating chamber 1 the same, excluding the recess dimension m of the door, the actual heating chamber dimension will be 2. , from Fig. 1, the door thickness is larger, the heating chamber depth is smaller, and the opening/closing of the door 11 is difficult to operate.
Moreover, when the door is opened, the high-frequency heating device becomes unstable and easily falls over.

OBJECTS OF THE INVENTION The present invention aims to eliminate the above-mentioned drawbacks and provide a low-cost and compact high-frequency heating device.

Structure of the Invention In order to achieve the above object, the high frequency heating device of the present invention has the following features:
a heating chamber for accommodating an object to be heated; a door provided at the opening of the heating chamber so as to be openable and closable; and a door provided protruding from an extension of a front plate at the periphery of the opening of the heating chamber that makes surface contact with the door. an opening of a choke structure provided at the door periphery, and an opening of the choke structure provided at the door periphery is provided at the door outer periphery between the outer panel and the inner panel of the door, and the inner panel of the door is provided at the heating chamber opening. It has a structure in which a recess is provided in the direction of the outer panel of the door from approximately the same dimensions as the door, and the front and rear dimensions of the product can be made compact to the same dimensions as the recess of the door, as well as the height of the door.

Even if the thickness is reduced, there is no leakage of radio waves, so the main body can be made smaller, and the door thickness is easy to handle, making it an easy-to-use high-frequency heating device. This is what determines the effectiveness of the 6th.

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

In FIG. 3, the heating chamber 2o is formed of a top plate 21, a U-shaped side plate 22a1, a bottom plate 22b, a front plate 23, and a heating chamber back plate 24 of the heating device. On the outside of this heating chamber, an inverted U-shaped side plate 25a, an upper plate 26b1, and a main body bottom plate 26 are attached. Bottom plate 2 inside heating chamber 2o
2b has a tray holder 10.

Next, the configuration of the door 27 will be explained. An inner plate 28 made of a metal plate having a large number of punched holes is in contact with the front plate 23 around the opening of the heating chamber 2o, and the central part is heated at a position having approximately the same size as the opening dimension H of the front plate 23 of the heating chamber 20. room 2
A recessed portion 29 is formed outside of o toward the outer panel 30 of the door 27.

The end surface of the outer panel 3o of the door 27 is bent into an L shape and has a periodic structure such as slits (Japanese Patent Application No. 57-13715).
(see Publication No. 09), the inner panel 28 of the door 27 and the outer panel 3 of the door
0 and a choke groove 31 and a choke opening are provided therebetween, and the choke opening has a choke cover 32.

In this embodiment, the transparent plate 33 on the front side of the door 27 and the choke cover are integrally formed. A transparent sheet 34 is attached to the inner surface of the door 2γ. A sash 8 is provided extending and protruding from the front plate 23 opposite the choke opening.

In this way, according to this embodiment, the heating chamber 2o is heated during cooking.
The inner plate 28 of the door 27 is in surface contact with the front plate 23 around the opening of the door 27.
Even if high frequency waves leak from between the door 27 and the inner plate 23 of the door 27,
The waves that have been sufficiently attenuated by the surface contact are reflected by the protruding sash 8 and most of them return to the heating chamber 20, but on the way back, they interfere with further advancing waves at the surface contact portion and are attenuated. On the other hand, sash 8
It leaks in an L-shape at the outer panel of the door 27, which has a periodic structure such as a curved wave or slit, and is further attenuated by the choke groove 31 inside the choke opening.
As a result, leakage of radio waves to the outside world is almost completely eliminated.

Therefore, the door structure is small and compact with extremely little radio wave leakage.

Further, in this embodiment, the choke opening cover and the transparent plate on the outside of the door are integrally formed, so that the number of parts is reduced and the device is made more compact.

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

(1) The recess on the inner surface of the door serves as a heating chamber, and the choke structure around the outer panel of the door allows the size of the door choke to be reduced, making it possible to reduce the height dimension of the door. The height and external dimensions can be reduced,
It can be made very compact.

(2) Since the external dimensions are extremely compact, less packaging material is required, which is not only economical but also reduces transportation costs.

(3) Since the door is extremely compact, it is small and light, and is very easy to use.

[Brief explanation of drawings]

1 and 2 are longitudinal cross-sectional views of a conventional high-frequency heating device, and FIG. 3 is a vertical cross-sectional view of a high-frequency heating device showing an embodiment of the present invention. 8...Satush, 20...Heating chamber, 2
7...Door, 28...Inner plate of door, 3
o...Door outer panel, 31...Choke groove. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] (1) A heating chamber for accommodating an object to be heated, a door provided at the opening of the heating chamber so as to be openable and closable, and a door provided protruding from an extension of the front plate at the periphery of the opening of the heating chamber that makes surface contact with the door. an opening of the choke groove provided on the door periphery is provided at the outer periphery of the door between the outer plate and the inner plate of the door, and the inner plate of the door is provided with an opening of the heating chamber. A high-frequency heating device having a configuration in which a recessed portion is provided toward the outer panel of the door from approximately the same size as the outer panel of the door.