JPS5818081Y2 - heating device - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a so-called hot air circulation system that improves the heat distribution within the heating chamber by circulating the atmosphere in the heating chamber in which food is cooked.

Conventional configuration and problems The conventional hot air circulation system is commercialized in gas cookers in Japan, but its main structure is a rotating shaft of a motor attached to the outer wall of the heating chamber. was inserted into the hot air passage in the heating chamber, and a fan was attached to the heating chamber side of the rotating shaft.

The rotating shaft is made of metal, so when the temperature of the fan rises, heat is transmitted through the rotating shaft and increases the temperature of the motor. Therefore, from the standpoint of heat resistance, a large motor with a low temperature rise is used. However, as the price increases, the space required to install the heater also increases, resulting in a large heating device.

OBJECT OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned conventional drawbacks and to provide an economical and compact heating device.

Structure of the Device In order to achieve the above-mentioned object, the present invention includes a heating chamber for storing and cooking food in a main body, a heating device for increasing the ambient temperature in the heating chamber, and circulating air in the heating chamber. A heating chamber wall penetrating portion of the fan shaft is made of a heat-resistant dielectric material such as ceramic.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below using an embodiment applied to a high-frequency heating device with a heater.

There is a heating chamber 2 in the main body 1 for cooking food.

A door 3 is attached to the front opening of the heating chamber 2 so as to be openable and closable.

A power supply port 4 is formed in the upper part of the heating chamber 2, and is connected to a magnetron 5, which is a high frequency generator, through a waveguide 6, and a high frequency wave is radiated into the heating chamber 2.

Note that the power supply port 4 is covered with a dielectric cover 7 to prevent food particles from entering.

A rotary mounting table 8 driven by a magnet is mounted on the lower wall of the heating chamber 2, and a rotary tray 9 is placed on the rotary mounting table 8.

That is, a magnet A10 is attached to the lower part of the rotary mounting table 8, and when a pulley A11 attached to the outside bottom of the heating chamber rotates, a magnet B12 attached to the pulley All rotates, and the magnet All is attracted to the magnet B12, and the roller The rotary mounting table 8 supported by 13 rotates.

Next, a constriction section 14 is provided on the rear wall of the heating chamber, and the constriction section 14
a heater 15 for increasing the atmospheric temperature in the heating chamber 2;
A fan 16 is installed to circulate the atmosphere within the heating chamber 2.

Furthermore, a partition plate 1 is installed in front of the constriction part to improve air circulation within the heating chamber and to improve heat distribution within the heating chamber.
7 is tightened with screw 18.

Therefore, when the fan 16 rotates, the air sucked in through the punched hole 19 at the center of the compartment plate 17 is heated by the heater 15, and is discharged into the heating chamber from the punched hole 20 at the periphery of the compartment plate 17, where it circulates as shown by the arrow. , the food 22 placed on the food plate 21 placed on the rotating saucer 9 is heated and cooked.

Next, a method for cooling the magnetron 5 and driving the circulation fan 16 and the rotary mounting table 8 will be explained with reference to FIGS. 2 and 3.

Air flowing in from the punched intake ports 24 and 25 provided on the back plate 23 of the main body cools the motor 26, and is blown onto the magnetron 5 and the high-pressure transformer 28 by the propeller fan 27 to cool them.

Note that the intake port 25 is for cooling the pulley E29 and the bell C30.

The air that has cooled the magnetron 5 enters the heating chamber through the punched hole 31 provided in the heating chamber wall only during high frequency operation.
When the heater 15 is operating, the solenoid 32 attracts the guide 33 and blocks the punched hole 31.

Therefore, it is discharged to the outside from an exhaust port 35 provided in the bottom wall 34 of the main body.

When the motor 26 rotates, the pulley D attached to the intake port 24 side 36. F37 rotates, the belt C30 rotates the circulation fan 16 in the heating chamber, and the belt C30 rotates.
After driving the worm gear 39 and decelerating the bell)A
40 rotates pulley All.

centre. - When the rear All rotates, the rotary mounting table 8 rotates.

Note that 41.42 are boots B and C attached to the worm gear 39.

Next, referring to FIG. 4, an enlarged portion of FIG. 1A will be explained.

A hole 44 is made in the rear wall 43 of the heating chamber, and the circulation fan 1 is installed in this hole.
The rotating shaft 45 of No. 6 passes through it.

This rotary shaft 45 uses a heat-resistant dielectric material 46 such as ceramic at a location facing the rear wall 43, and metal pipes 46 are provided on both sides of the material.
7°48 is silver soldered.

That is, the circulation fan 16 is installed in the metal pipe 47 on the heating chamber side.
is tightened with screw 49, and pulley E 29 is tightened on the outside with pin 5.
It is fixed at 0.

In addition, a heat insulating material 51 is provided on the heating chamber wall to reduce heat dissipation.
is pressed and fixed by a metal plate 52.

Furthermore, bearings are not shown because they would complicate the drawings.

When applied to a high-frequency heating device as shown in this embodiment, there is no leakage of radio waves from the rotating shaft of the circulation fan, making it extremely safe.

In other words, when a conventional metallic rotating shaft is used, there is a risk that radio waves leaking from the air outlet and intake port formed by punching provided in the compartment plate will leak outside using the metallic rotating shaft as an antenna. If a heat-resistant dielectric material is used as in this embodiment, radio wave leakage can be extremely reduced.

Therefore, in the case of a conventional rotary shaft, it was necessary to provide a choke mechanism for preventing radio wave leakage on the outer wall of the heating chamber, but compared to this, the space for the choke is not required and the cost is also extremely low.

Effects of the Invention As described above, since a heat-resistant dielectric material such as ceramic is disposed in the heating chamber wall penetrating portion of the rotating shaft of the circulation fan, the following effects are produced.

(1) Compared to a conventional metal rotating shaft, the heat dissipated from the heating chamber through the rotating shaft is drastically reduced, and the temperature inside the heating chamber increases quickly, resulting in an extremely highly efficient heating device.

(2) In relation to 1, the ambient temperature of the rotary drive device, motor, belt pulley, etc. outside the heating chamber decreases, and the temperature of these components also decreases.

Therefore, parts with low heat resistance can be used, and the motor can be made smaller, making it extremely economical and improving reliability.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of a hot air circulation type heating device showing an embodiment of the present invention, Fig. 2 is a side view of the heating device with the exterior removed, Fig. 3 is a top view of the same, and Fig. 4 is a side view of the heating device with the exterior removed. The figure is an enlarged sectional view of section A in FIG. 1. 1...Main body, 2...Heating chamber, 5...
... Magnetron, 16 ... Circulation fan, 4
3... Rear wall, 45... Rotating shaft, 46...
...Heat-resistant dielectric material, 47.48 ...Metal pipe.

Claims (1)

[Scope of utility model registration request] The main body includes a heating chamber in which food is stored and cooked, a heating device that increases the ambient temperature in the heating chamber, a fan that circulates air in the heating chamber, and a motor that rotates the fan. , a heating device in which the heating chamber wall penetrating portion of the fan shaft is made of a heat-resistant dielectric material such as ceramic.