JPS5913521Y2 - hot air cooker - Google Patents

Description

[Detailed description of the invention] This invention relates to an improved structure of a type of hot-air cooker in which high-frequency radio waves and hot combustion air are supplied as appropriate, and in particular, the purpose is to reduce the cost of the exhaust hole part that discharges hot air from the cooking chamber to the outside. There is something to do.

In a hot air cooker that forcibly guides most of the combustion hot air from the gas burner into the cooking chamber using a fan and also supplies high-frequency radio waves into the cooking chamber, an exhaust hole is provided to appropriately discharge the hot air from the cooking chamber. The exhaust hole requires a relatively large opening ratio in order to effectively carry out combustion in the burner and increase the amount of combustion, and also requires means for shielding high frequency radio waves.

Therefore, a cut-off method is often used as the above-mentioned shielding means, and in this case, a metal tube structure can be used to increase the aperture ratio, but there are problems in that the number of parts and spot welding points are large, making workability poor. be.

The present invention was devised to solve the above problems, and will be explained below based on examples.

Reference numeral 1 denotes a cooking device main body, in which a combustion chamber 4 is defined at the bottom of a cooking chamber 2 via a bottom plate 3, and a rectangular ventilation chamber 5 which is long in the left-right direction is provided at the back of the cooking chamber 2.

Reference numeral 6 denotes a high-frequency radio wave irradiation chamber provided in the upper part of the cooking chamber 2, which is equipped with a stirrer fan 7 and communicates with an antenna section of a magnetron (not shown).

8 is a door pivoted to the front opening of the cooking chamber 2 so that it can be opened and closed; 10;
is a gas burner provided within the combustion chamber 4.

Reference numeral 11 denotes a centrifugal fan installed in the ventilation chamber 5, which has a shaft 12 in the center of the ventilation chamber 5, and is driven by an electric motor 13 through this shaft, sucking air from the center of the ventilation chamber 5 and exhaling from the surroundings. do.

The electric motor 13 is mounted on the back outside of the ventilation chamber 5, so that the shaft 12 passes through the back wall 14 of the ventilation chamber 5.

15 is a radio wave shielding means having a choke structure provided around the shaft 12.

Reference numeral 16 denotes a slit-shaped intake hole provided vertically on both left and right sides of the ventilation chamber 5, which communicates with the combustion chamber 4 through an intake passage 17, and a honeycomb-shaped partition plate 18 inserted therein. The metal tube structure is used to shield radio waves.

19 is an exhaust hole formed in the upper surface 20 of the ventilation chamber 5;
It consists of a large number of pores 21 that can shield high frequency radio waves.

Reference numeral 22 denotes an air baffle plate interposed between the centrifugal fan 11 and the exhaust hole 19 from slightly below the upper surface 20. One end 23 is connected to the left corner of the upper surface 20 of the ventilation chamber 5, and the other end 24 is connected to the right corner thereof. A discharge passage 25 is defined between the upper surface 20 and the upper surface 20.

When the gas burner 10 is burned and the electric motor 13 is activated to rotate the centrifugal fan 11 to the left toward the ventilation chamber 5, the air in the cooking chamber 2 is sucked into the ventilation chamber 5 near the shaft 11. After that, it is discharged from around the ventilation chamber 5 into the cooking chamber 2 again.

Then, due to this discharge, the gas burner 10 is
The hot combustion air is drawn into the cooking chamber 2.

In addition, a part of the air in the ventilation chamber 5 is transferred from the exhaust passage 25 to the exhaust hole 1.
9 and then discharged to the outside.

Furthermore, high frequency radio waves are supplied from the irradiation chamber 6 into the cooking chamber 2 by the operation of a magnetron (not shown).
1. Radio wave shielding is performed respectively.

Here, we will explain the function of the air baffle plate 22. First, if it is not present, the pores 21 on the left side of the centrifugal fan 11, which rotates counterclockwise, will conversely become negative pressure and the air will be sucked in. At the left end, the air can be exhausted by the upward force of the circulating air hitting the side wall.

Therefore, the suction and exhaust action partially changes in a complicated manner, and a sufficient amount of exhaust cannot be expected.

Further, in the area directly above the fan 11, the exhaust direction is completely perpendicular to the direction of the pores, so the wind noise is very loud.

Note that this decreases as the distance from the center of the fan 11 increases.

In this way, since the air baffle plate 22 has both ends 23 and 24 opened at the corners, the circulating air can always obtain an upward force, and is therefore exhausted from all the pores 21. be able to.

Moreover, since the wind pressure of this circulating air is alleviated by entering the exhaust passage 25, wind noise can be easily reduced.

It should be noted that when the centrifugal fan 11 rotates clockwise, the left and right operations described above are reversed.

During counterclockwise rotation, one end 23 of the baffle plate 22 is on the negative pressure side, while the other end 24 is on the positive pressure side, so the other end 24 does not necessarily need to be provided at a corner.

Conversely, when rotating clockwise, one end 23 can receive sufficient wind pressure for exhaust even if it is not at a corner.

As mentioned above, the hot air type cooking device according to the present invention has a ventilation chamber connected to the cooking chamber to which high-frequency radio waves and combustion hot air are appropriately supplied, and a centrifugal fan is installed in the ventilation chamber to draw air from the center and exhale from the periphery. An exhaust hole to the outside consisting of multiple pores that can shield high-frequency radio waves is provided on the upper surface of the ventilation chamber, and an air conditioning plate is installed between this exhaust hole and the fan, and the air conditioning plate is used to exhaust air. The exhaust hole is formed with an exhaust passage that communicates with the upper corner of the ventilation chamber. Therefore, the exhaust hole can be provided in the center of the upper surface of the ventilation chamber, and a large opening ratio can be achieved with a simple structure such as a punching plate. It has become easy to increase the capacity of gas burners.

[Brief explanation of the drawing]

Figure 1 is a side cross-sectional view of the hot air cooker according to the present invention;
The figure is a sectional view taken along the line AA in FIG. 1. 2... Cooking room, 5... Ventilation room, 11.
...Centrifugal fan, 19 ...Exhaust hole, 20
...Top surface, 21... Pore, 22...
... Air conditioning board, 25... Exhaust channel.

Claims (1)

[Scope of utility model registration request] A ventilation chamber is formed in communication with the cooking chamber to which high-frequency radio waves and combustion hot air are appropriately supplied, and a centrifugal fan that takes in air from the center and discharges air from the surrounding area is housed in this ventilation chamber. In addition to providing an external exhaust hole consisting of multiple pores that can shield radio waves, an air conditioning plate is installed between this exhaust hole and the fan, and this air conditioning plate connects the exhaust hole to the upper corner of the ventilation chamber. A hot-air cooking device characterized by forming a communicating discharge passage.