JPS6216561Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a high-frequency heating cooking device for cooking food, and particularly to a heat shielding device for blocking radiant heat from an oven in this high-frequency heating cooking device. Regarding.

[Technical background of the invention]

As shown in FIGS. 1 to 4, this type of high-frequency heating cooking apparatus that has already been proposed has an opening/closing door 2 and an operation panel 3 on the front of a box-shaped casing body 1. 1, an oven 4 and a machine room 5 are separated by an oven frame 6, a magnetron 7 is attached to the upper part of one side of the oven frame 6, and a waveguide 8 is attached to the magnetron 7.
is attached along the top plate 6a of the oven frame 6, and an electrical component 9 such as a high-voltage transformer or a capacitor is installed on the bottom plate 1a of the casing body 1 where the machine room 5 is located. A cooling fan 10 is attached to the inner wall of the back plate 1b of the casing body 1 located near the component 9 so as to cool the magnetron 7 and the electrical component 9, and a cooling fan 10 is attached to the inner wall of the back plate 1b of the casing body 1 located near the component 9. A heat shield plate 11 made of a flat heat insulating material for shielding the radiant heat from the oven 4 is provided on the side with a gap 12 in between, with its lower end free. A partition plate 13 is installed upright in the machine room 5, and a substrate 14a of a door lock device (locking device) 14 containing a lock switch for the opening/closing door 2 is fixed to the side surface of the heat shield plate 11.

Therefore, when the high-frequency heating cooking device heats the food placed on the shelf board (not shown) in the oven 4, the magnetron is activated by pressing the operation button on the operation panel 3. 7 is energized, the radio waves from the magnetron 7 are guided into the oven 4 through the waveguide 8, and the food to be cooked is heated.

On the other hand, the heat generated from the magnetron 7, high voltage transformer, condenser, and other electrical components 9 in the machine room 5 is forcibly cooled down by the driving of the cooling fan 10, and the heat generated by the bottom plate of the casing body 1 is The exhaust air is discharged through an exhaust port 15 drilled in the oven 1a, while the heat shield plate 11 and the partition plate 13 block the radiant heat from the oven 4, and the integrated circuit (IC) incorporated in the operation panel 3 ), printed circuit boards, and other electronic components.

[Problems with background technology]

However, the above-mentioned high-frequency heating cooking apparatus has a heat shield plate 11 and a partition plate 13 vertically disposed on one side of the oven frame 6 with a gap 12 therebetween, and a lock device 14 is installed on the side wall of the heat shield plate 11. Since the substrate 14a is fixed to the partition plate 13,
Not only does the number of component parts increase, such as
The number of processing and assembly steps increases, and adjustments during assembly are troublesome, making it difficult to save labor through mass production.Furthermore, the cooling exhaust air from the exhaust port 15 by the cooling fan 10 is The heat shield plate 11 and the partition plate 13 prevent the air from being sufficiently exhausted, and furthermore, the lower end of the heat shield plate 11
Because it is free and not fixed, when cooking,
There is also a risk that self-excited vibration may occur due to the magnetic field generated by a high-voltage transformer or the like, causing a resonance phenomenon, or that the lock switch incorporated in the door lock device 14 may be damaged.

[Purpose of invention]

The present invention was made in view of the above-mentioned circumstances, and the lower part of the heat shield plate having a ventilation hole bored on one side of the oven frame is fixed to the bottom plate of the casing body. In addition to reinforcing the bottom plate of the casing body in some areas, we also aimed to improve the cooling efficiency of electrical parts, reduce the number of component parts, facilitate processing and assembly adjustment, and save labor through mass production. It is an object of the present invention to provide a high frequency heating cooking device in which a built-in lock switch is prevented from malfunctioning.

[Summary of the idea]

The present invention forms an oven and a machine room separated by an oven frame in a casing body equipped with an opening/closing door, and a heat shield plate is erected with a gap along one side of the oven frame. , a door lock device for the opening/closing door is attached to a part of the heat shield plate, a lower fixing part of the heat shield plate is fixed to the bottom plate of the casing body,
A ventilation hole is formed in the lower part of the heat shield plate, and the width of each lower corner of the heat shield plate is narrower than the width of the fixed part, so that the heat shield plate can be freely bent by each lower corner. This is designed to absorb vibrations generated during transportation and prevent malfunction of the lock switch of the door lock device.

[Example of idea]

Hereinafter, the present invention will be described with reference to an illustrated embodiment.

In addition, the present invention will be described with the same reference numerals attached to the same constituent members as in the above-described specific example.

In FIGS. 5 to 8, reference numeral 1 denotes a box-shaped casing body, and the front side of the casing body 1 is provided with a side-opening door 2 and an operation panel 3. Furthermore, an oven 4 and a machine room 5 are formed within the casing body 1, separated by an oven frame 6.
A well-known magnetron 7 is attached to the upper part of one side wall of the oven frame 6, and a waveguide 8 communicating with the oven 4 is connected to the top plate 6a of the oven frame 6. It is attached along. Furthermore, the bottom plate 1a of the casing body 1 where the machine room 5 is located has, for example,
Electrical components 9 such as a high-voltage transformer and a capacitor (not shown) are installed, and the back plate 1b of the casing body 1 located near the electrical components 9 is used to cool the magnetron 7 and the electrical components 9. A cooling fan 10 is attached.

On the other hand, as shown in FIGS. 7 and 8, on one side of the oven frame 6, a heat shield plate 16 for shielding radiant heat from the oven 4 has a gap 12. It is erected so as to cover substantially the entire side surface of the oven frame 6.

That is, the heat shield plate 16 has a pair of lug pieces 1.
6a protrudes horizontally so as to be fixed to the oven frame body 6 with set screws, and the lower fixing portion 16b of the heat shield plate 16 is fixed to the bottom plate 1a of the casing body 1 with set screws 18. It is fixed in place. Further, in the lower part of the heat shield plate 16, a horizontally elongated vent hole 17, which is larger than the width L of the electrical component 9 made of the largest high-voltage transformer in the machine room 5, is bored. The width of each lower corner portion 16c formed between both side edges of the vent hole 17 and both vertical edges of the vent hole 17 is narrower than the width of the lower fixing portion 16b so as to cause flexure.

Therefore, the lower fixing portion 16b is attached to the bottom plate 1a.
The bottom plate 1a is substantially integrated with the set screw 18 to reinforce the strength of the bottom plate 1a, and even if the bottom plate 1a is bent by a heavy electrical component 9 such as a high voltage transformer, Each of the above lower corner portions 16
Since the width of the lower fixing portion 16b is narrower than the width of the lower fixing portion 16b, the lower fixing portion 16b is configured to be able to bend freely and not cause a malfunction of the lock switch of the door lock device 14 of the opening/closing door, which will be described later. There is. In other words, the heat shield plate 16 improves cooling efficiency through the ventilation holes 17, and also reinforces the material of the bottom plate 1a. By allowing the lock switch to flex freely, vibration is not applied to the lock switch of the door lock device 14, and malfunctions are prevented from occurring due to vibrations received during transportation, for example.

On the other hand, a portion of the heat shield plate 16 is provided with a through hole 19.
a, 19b are bored, and one end of the waveguide 8 is loosely fitted into the through hole 19a. Further, an exhaust duct 20 is provided in the through hole 19b.
is arranged to communicate with the oven 4, and a door lock device 14 containing a lock switch for the opening/closing door 2 is attached to one side wall of the heat shield plate 16.

Incidentally, a bent piece 16d is formed by horizontally bending the vent hole 17 bored in the lower part of the heat shield plate 16, and this bent piece 16d and the lower fixing part 16b are By forming a roughly U-shape,
The reinforcing rib function can be assisted.

Therefore, during cooking, the heat generated from the magnetron 7 and electrical components 9 in the machine room 5 is forcibly discharged from the machine through the exhaust port 15 and the ventilation port 17 by driving the cooling fan 10. In addition to being discarded, the radiant heat from the oven 4 is removed from the heat shield plate 1.
6, there is no risk of adverse thermal effects on the integrated circuits, printed circuit boards, etc. incorporated in the operation panel 3. Moreover, the lower fixing portion 16
b can be freely bent by the lower corners 16c to absorb vibrations generated during transportation, prevent the lock switch of the door lock device 14 from malfunctioning, and at the same time reinforce the bottom plate 1a. It is becoming more common to do so.

[Effect of idea]

As described above, according to the present invention, the oven 4 and the machine room 5 are separated and formed by the oven frame 6 in the casing body 1 equipped with the opening/closing door 2,
A heat shield plate 16 is erected with a gap along one side of the oven frame 6, and a door lock device 14 for the opening/closing door 2 is attached to a part of the heat shield plate 16. 16 lower fixing parts 16b are fixed to the bottom plate 1a of the casing body 1, and vent holes 17 are bored in the lower part of the heat shield plate 16, so that the width of each lower corner part 16c of the heat shield plate 16 is adjusted. Each lower corner portion 2 of the lower fixing portion 2b is formed narrower than the lower fixing portion 16b.
Since it is made to bend freely by c,
It absorbs vibrations generated during transportation, etc., thereby not only preventing malfunction of the lock switch incorporated in the door lock device 14 attached to the heat shield plate 16, but also improving cooling efficiency.
This has excellent effects such as strengthening the material strength of the bottom plate 1a of the casing body 1 and preventing adverse thermal effects on the printed circuit board and integrated circuit incorporated in the operation panel 3.

[Brief explanation of the drawing]

FIG. 1 is a front view of an already proposed high-frequency heating cooking device, and FIG. 2 is a chain line A-A in FIG.
FIG. 3 is a partially cutaway perspective view of the oven frame to be incorporated into the high-frequency heating cooking apparatus, and FIG. 4 is a cross-sectional view taken along the chain line B-B in FIG. 2. 5 is a cross-sectional view showing the main parts of the high-frequency heating cooking device according to the present invention, FIG. 6 is a cross-sectional view of the same, and FIG. 7 is a perspective view of a heat shield plate incorporated in the present invention. FIG. 8 is a longitudinal sectional view of the present invention. 1...Casing body, 2...Opening/closing door, 4...
Oven, 5... Machine room, 7... Magnetron,
9... Electrical parts, 10... Cooling fan, 14...
...Door lock device, 16...Heat shield plate, 17...Vent.

Claims (1)

[Scope of utility model registration request] An oven and a machine room are separated and formed by an oven frame in a casing body equipped with an opening/closing door, and a heat shield plate is erected with a gap along one side of the oven frame. A door lock device for the opening/closing door is attached to a part of the plate, a lower fixing part of the heat shield plate is fixed to the bottom plate of the casing body, and a ventilation hole is bored in the lower part of the heat shield plate. A high-frequency cooking device characterized in that the width of each lower corner of the hot plate is narrower than the width of the lower fixed portion.