JPH0446399Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement in the radio wave leakage prevention structure of a high frequency heating device.

Conventional technology: A door rear plate that seals the heating chamber opening, a frame-shaped door front plate joined to the outside of the door rear plate, and a frame-shaped door front plate that seals the heating chamber opening. A high-frequency heating device having a chiyoke cavity surrounded by a plurality of metal pieces protruding toward the front is disclosed in Japanese Patent Application Laid-Open No. 1986-
As in Publication No. 201289, a latch lever was provided on the outside of the chiyoke cavity to control the on/off state of the high frequency oscillator and keep the door sealed.
Therefore, the external dimensions of the door become large, and the high-frequency heating device as a whole becomes large.

Problems to be Solved by the Invention When the peripheral wall of the chiyoke cavity itself is made of multiple metal pieces as in the above conventional example, if the latch lever is provided outside the chiyoke cavity, the external dimensions of the door and the entire high frequency heating device The point is that it becomes larger.

Means for Solving the Problem The latch lever is placed in the chute yoke cavity and fixed with the latch lever mounting screw, its length is shorter than the overhanging dimension of the metal piece, and the set screw is placed so that it does not cross the chute yoke inlet.

Effect: By configuring as described above, the latch lever is fixed inside the jaw cavity. Leakage power inside the chiyoke cavity is not reflected even if there is a set screw. Therefore, the damping effect of the chiyoke cavity is not impaired.

Embodiment The structure and operation of a high-frequency heating device according to an embodiment of the present invention will be explained with reference to the drawings.

FIG. 2 shows an embodiment of the present invention, in which numeral 1 is a heating chamber for storing an object to be heated, and numeral 2 is a high-frequency oscillator that generates high-frequency energy. Reference numeral 3 denotes a heating chamber opening through which the heated object is taken in and taken out, and 4 is a door for opening and closing the heating chamber opening. Reference numeral 5 denotes a dielectric latch lever that controls on/off of the high frequency oscillator 2 and maintains the closed state of the door 4. Reference numeral 6 denotes a flange provided around the heating chamber opening 3, and the flange 6 has a latch insertion opening 7 through which the latch lever 5 passes. Reference numeral 8 denotes a check cover that closes the entrance of the check cavity 9 provided around the door 4.

FIG. 1 shows the mounting portion 10 of the latch lever 5 with the tie yoke cover 8 removed. The housing cavity 9 includes a door rear plate 1 that seals the heating chamber opening 3.
1, a frame-shaped door front plate 12 joined to the outside of the door rear plate 11, and a plurality of metal pieces protruding from the outermost edge of the door front plate 12 toward the peripheral edge 13 of the door rear plate 11. It consists of 14. The latch lever 5 is attached to the door front plate 12 by a nut 15 embedded in a mounting portion 10 in the York cavity 9.
It is fixed by screwing in a metal set screw 16 inserted from the outermost periphery. Set screw 1
The length A of the metal piece 14 is made shorter than the overhang dimension B of the metal piece 14. The latch lever 5 is the door rear plate 11
The metal piece 14 protrudes from the yoke inlet 17 between the peripheral end 13 of the metal piece 14 and the tip 18 of the metal piece 14.

Next, the operation of the embodiment configured as described above will be explained.

A plurality of metal pieces 14 forming the peripheral wall of the chiyoke cavity 9
When the door 4 is sealed and the high frequency oscillator 2 is operating, the radio waves that are about to leak to the outside through the gap between the door rear plate 11 and the flange 6 are efficiently guided into the chiyoke cavity 9. It acts as a kind of matching element to promote the damping effect of the chiyoke cavity 9. If the length A of the set screw 16 is made longer than the protruding dimension B of the metal piece 14, leakage radio waves entering the Chiyoke cavity 9 will be reflected on the way, making the Chiyoke cavity 9 apparently shallower. Significantly worsens the damping effect. Length A of set screw 16
It has been experimentally confirmed that by making B shorter than the overhang dimension B of the metal piece 14, the damping effect of the York cavity 9 is not impaired.

Effects of the invention As described above, according to the present invention, the latch lever is fixed in the chock cavity with a set screw having a dimension shorter than the overhanging dimension of the plurality of metal pieces forming the peripheral wall of the chiyoke cavity. The outer dimensions of the door can be reduced without impairing the damping effect of the cavity. Therefore, the entire high-frequency heating device can be made compact.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a mounting portion 10 of a latch lever 5 provided on a door 4 of a high-frequency heating device according to an embodiment of the present invention, and FIG. 2 is a perspective view of essential parts of the same high-frequency heating device. 2... High frequency oscillator, 3... Heating chamber opening, 4
...Door, 5...Latch lever, 9...Chiyoke cavity, 11...Door rear plate, 12...Door front plate, 1
3...peripheral end, 14...metal piece, 16...set screw.

Claims (1)

[Scope of utility model registration request] A door rear plate 11 that seals the heating chamber opening 3; a frame-shaped door front plate 12 joined to the outside of the door rear plate 11; In a high-frequency heating device equipped with a door 4 having a chiyoke cavity 9 surrounded by a plurality of metal pieces 14 extending toward an end portion 13, the door 4 controls turning on and off of the high-frequency oscillator 2.
Dielectric latch lever 5 that maintains the sealed state of
This latch lever 5 is fixed with a metal set screw 16 inserted into the housing 9 from the outermost edge of the door front plate 12, and its length A is A high-frequency heating device characterized in that the protruding dimension B of the piece 14 is shorter than that of the protruding dimension B.