JPS5927496A - 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 the Invention The present invention relates to prevention of radio wave leakage in microwave ovens and the like which are high frequency heating devices.

Structure of conventional example and its problems In a conventional microwave oven, which is a high-frequency heating device, for example, in order to prevent the leakage of high-frequency waves from the opening of the heating chamber, the peripheral edge of the door provided at the opening of the heating chamber is In addition to providing a choke groove with a depth of 1/4 of the wavelength used, a ferrite, which is a radio wave absorber, is provided on the approximately U-shaped satsusher facing the periphery of the door. A structure in which a periodic structure having slits at regular intervals is provided in the choke groove, or a choke groove is provided in the periphery of the door and slits are provided in a substantially U-shaped satsuri provided opposite the periphery of the door. It was.

However, although these devices satisfy a certain level of radio wave leakage prevention standards, they have the disadvantage that they are structurally complex, have poor productivity, and cannot reduce costs.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to provide a high-frequency heating device that does not cause leakage of radio waves and has excellent productivity.

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 substantially colloid provided protruding from an extension of the opening peripheral plate of the heating chamber that makes surface contact with the door. A slit is provided in a choke groove provided at the peripheral edge of the door, and in the sash provided opposite to the choke groove, and an opening of the choke groove is formed in the heating chamber. The configuration is such that it is provided between the outer plate and the inner plate of the door, facing the opening peripheral plate of the door.Even if the size of the door is reduced, there is no leakage of radio waves, so the main body can be made smaller, and the door and The satush provided facing the periphery of the door is simple in structure, and has the advantage of being easy to assemble and productive, and can be provided as a high-frequency heating device that is aesthetically pleasing and easy to use. It is something that you have.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In FIG. 1, reference numeral 1 denotes a main body of a high-frequency heating device, and a door 3 is provided at the opening of a heating chamber 2 provided in the main body 1 so as to be openable and closable. 4 is an operation panel provided on the front side of the main body 1, and this operation panel 4 is provided with a timer knob 5 for controlling heating time, a cooking start button 6, and a door opening/closing button 7.

In FIG. 2, reference numeral 8 denotes a high frequency generator that supplies high frequency waves into the heating chamber 2. As shown in FIG. Reference numeral 9 denotes a radio wave stirring blade that stirs the high frequency waves supplied into the heating chamber 2, and is used to improve the distribution characteristics of the high frequency waves within the heating chamber 2. Reference numeral 10 denotes a satchel provided five pages facing the peripheral edge of the door 3.

FIG. 3 shows the structure of the door 3 and the satchel 10 shown in FIG. It is bent into an oval shape, then bent upward and inward into a substantially U-shape as shown in FIG. 4, and the end portions are bent inward.

Reference numeral 14 denotes a slit provided at the end of the door outer panel 11, and this slit 14 can be made when the door outer panel 11 is molded. Reference numeral 16 denotes a door inner plate, and by attaching this door inner plate 15 to the door outer plate 11 with screws 16, it holds the transparent body 17 provided on the door outer plate 11 and connects this door inner plate 15 and the door. 1/ of the wavelength used by the outer plate 11
The choke groove 18 has a depth of 4 mm. 19 is an opening of a choke groove provided between the end of the door inner plate 15 and the slit 14 of the door outer plate 11. A transparent body 20 is made of a material that absorbs or transmits radio waves and constitutes the exterior of the door 3. This transparent body 20 is made of a material that absorbs or transmits radio waves, and is a transparent body that constitutes the exterior of the door 3. The door 3 is constructed by covering the end portion of the door inner plate 15. Reference numeral 21 denotes an opening peripheral plate of the heating chamber 2 with which the door inner plate 16 makes surface contact when the door 3 is closed;
A substantially U-shaped sash 1o is provided on an extension of the main body 1 so as to protrude toward the front of the main body 1 with a screw 22. 23 is a satchel 1 at regular intervals on the periphery of the door 3 as shown in FIG.
This slit 23 forms a choke groove 24 having a depth of 1/4 or 1/8 of the wavelength used. This slit 23 can be made when molding the sash 10. A cover 25 covers the slit 23 provided in the sash 1o and the sash 510, and the cover 25 is made of a material that absorbs or transmits radio waves.

The operation of the above configuration will be explained below.

First, the object to be heated is placed in the heating chamber 2, the cooking time is set using the timer knob 6, and when the cooking start button 6 is pressed, the high frequency generator 8 is activated to supply high frequency waves into the heating chamber 2, and the cooking time is set using the timer knob 6. Objects can be heated dielectrically.

The high frequency waves supplied into the heating chamber 2 are prevented from leaking out of the heating chamber 2 by the surface contact between the opening peripheral plate 21 of the heating chamber 2 and the door inner plate 15. The high frequency waves leaking from between the door inner plate 15 enter the choke groove 18 provided on the periphery of the door 3 and the choke groove 24 of the sash 10 provided opposite the periphery of the door 3. The high frequency waves that have entered the choke groove 18.24 are caused by the sill 1-23°1 provided on the sash 10 and the door outer panel 11.
4 restricts the movement in the X and Y directions, and movement in the Z direction can be restricted by the opening 19 of the choke groove 18. Furthermore, the leakage of radio waves in the Y direction at the opening 19 of the choke groove 18 is prevented by a slit 23 provided in the sash 10.
can be regulated. The high frequency waves still leaking from between the door inner plate 15 and the opening peripheral plate 21 are changed in the perpendicular direction at the sash 10, and the high frequency waves are further attenuated by the change in impedance due to the slit 23.

As described above, according to the high-frequency heating device of this embodiment, even if high-frequency waves leak from between the opening peripheral plate 21 of the heating chamber 2 and the door inner plate 15 that are in surface contact with each other during cooking, the high-frequency waves can be prevented from leaking to the peripheral edge of the door 3. The main body 1 is formed by a choke groove 24 provided on the satsush 1o and a choke groove 18 provided on the door peripheral portion.
Since it is possible to restrict high frequency waves leaking outside, the high frequency heating device can be used without causing radio wave interference to other equipment.

Furthermore, the slits 14° 23 provided at the ends of the door outer panel 11 and the sash 10, which constitute the choke groove 18, can be formed when the door outer panel 11 and the sash 10 are molded, and the structure of the door 3 can be Since it can be simplified, it has good assembly workability and can be provided at low cost.

Furthermore, by providing the opening 19 constituting the choke groove 18 between the door outer panel 11 and the door inner panel 15 so as to face the opening peripheral plate 21, the door inner panel 15 is in surface contact with the opening peripheral plate 21.
Since the dimensions of the main body 1 can be shortened, the size of the main body 1 can be reduced.

In addition, by covering the front surface and peripheral edge of the door 3 and the sash 10 provided on the peripheral edge of the door 3 with a transparent body 20 made of a material that absorbs or transmits radio waves, and a cover 259, the choke groove 18. The high-frequency heating device is easy to clean and easy to use even if food particles adhere to the 24th part.

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

(1) High frequency waves leaking from between the opening peripheral plate of the heating chamber and the door inner plate are attenuated by the action of the slit provided in the choke groove on the door peripheral part and the slit provided in the approximately U-shaped satchel. can be prevented from leaking out of the main body.

(2) The opening of the choke groove provided on the periphery of the door is provided between the door outer plate and the door inner plate, facing the opening periphery plate of the heating chamber, so that the inside of the door is in surface contact with the opening periphery plate. The size of the plate can be reduced, and the main body can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a high-frequency heating device that is an embodiment of the present invention, Fig. 2 is a sectional view of the same side, Fig. 3 is an enlarged sectional view showing the main part of Fig. 2, and Fig. 4 is the same side sectional view. FIG. 3 is a perspective view of the outer panel of the door shown in FIG. 3, and FIG. 5 is a perspective view of the sash shown in FIG. 3. 2...7JL41L room, 3...door,
10...The song is Tshu, 11...Door outer panel, 14
...Slit, 15 ...Door inner plate, 1
8... Chalk groove, 19. group, opening, 23.
... slit, 24... choke groove. Name of agent: Patent attorney Toshio Nakao Haga 1 person No. 3
Figure 4

Claims (4)

[Claims] (1) A heating chamber that accommodates an object to be heated, a door provided in the opening of the heating chamber so as to be openable and closable, and a door protruding from an extension of the opening peripheral plate of the heating chamber that makes surface contact with the door. a substantially U-shaped sash, and slits are provided in a choke groove provided at the peripheral edge of the door and in the sash provided opposite to the choke groove, and an opening of the choke groove. is provided between an outer plate and an inner plate of the door so as to face an opening peripheral plate of the heating chamber. (2) The high-frequency heating device according to claim 1, wherein the leading end of the door outer panel is bent inward in a substantially U-shape. (3) The high-frequency heating device according to claim 1, wherein at least the null portion provided on the M sash covers a material that absorbs or transmits radio waves. (4) The high-frequency heating device according to claim 1, wherein the slit and the opening of the choke groove provided on the peripheral edge of the door are covered with a material that absorbs or transmits radio waves.