JPS6236239Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a high frequency heating device equipped with a hot air circulation device.

In a high-frequency heating device equipped with a high-frequency heating device on the back wall of the high-frequency heating chamber, when cooking a large amount of grilled food using the heater heat source, it is necessary to place a heat-sensitive tube inside the high-frequency heating chamber to control the temperature inside the high-frequency heating chamber. The most accurate method is to install one, but microwaves may leak through the heat-sensitive tube lead wire during microwave heating, and sparks may be generated between the heat-sensitive tube and the wall of the high-frequency heating chamber, so these measures are not recommended. The drawback was that it was troublesome and costly.

This idea was made in consideration of the above circumstances, and its purpose was to communicate the bottom of the high-frequency heating chamber with the fan casing provided on the back wall through a communication passage, and to draw air from these communication passages. By preventing microwaves from passing between the mouth and the air outlet, and by installing a heat-sensitive tube near the air inlet, the temperature inside the high-frequency heating chamber can be accurately transmitted to the thermostat. The present invention aims to provide a high-frequency heating device that prevents microwave leakage and spark generation during wave heating.

An embodiment of this invention will be described below with reference to the accompanying drawings. Reference numeral 1 in FIG. 1 is a main body, and a high-frequency heating chamber 2 is provided inside the main body 1, and a door body 3 is provided on the front surface of the main body 1. A fan casing 5 is provided outside the back wall 4 of the high-frequency heating chamber 2, and a heater 6 and a fan 7 are provided inside the fan casing 5. fan 7
A fan motor 8 for driving the fan casing 5
is located outside. An air suction port 9 is provided on the back wall of the main body 1 facing the fan motor 8. An upper heater 10 is supported on the ceiling surface of the high-frequency heating chamber 2 by a heater receiver 11 and a back wall 4 of the high-frequency heating chamber 2. This heater 10
A lower heater 12 is also supported on the bottom surface of the high-frequency heating chamber 2 by a heater receiver 13 and a back wall 4, opposite to the lower heater 12. Further, a turntable 14 is provided above the lower heater 12 and rotated by a rotating shaft (not shown). Food 15 is placed on this turntable 14. A communication passage 16 communicating with the fan casing 5 is provided below the bottom plate of the high-frequency heating chamber 2 . Air suction port 17 of this communication path 16
is provided at the front of the bottom of the high-frequency heating chamber 2.
Further, the air outlet 18 of this communication passage 16 is provided on the front surface of the fan casing 5. and,
A large number of punching holes 19 are provided in each of the air inlet 17 and the air outlet 18 to prevent microwaves from passing therethrough. In addition, an air suction port 1 is provided in the communication passage 16.
A heat-sensitive tube 20 is attached near 7. This heat-sensitive tube 20 has an L-shaped mounting piece 21 provided inside a communication passage 16 that is divided into two parts, an upper duct 16a and a lower duct 16b, as shown in FIGS. 2 and 3. It is designed to be elastically supported between the mounting piece 21 and a leaf spring 22 fixed to the mounting piece 21. Note that the heat-sensitive tube 20 may be attached to the air suction port 17 of the communication path 16 as shown in FIG.

Next, a waveguide 23 for a magnetron (not shown) is provided on the ceiling surface of the high-frequency heating chamber 2, and the microwave is transmitted through an opening 2 provided on the ceiling surface.
4 into the high-frequency heating chamber 2 to cook food 15 with microwave heating. Also,
An exhaust passage 25 is provided on the ceiling surface of the high-frequency heating chamber 2, and is designed to exhaust gases generated during cooking of the food 15. For this purpose, an air outlet 26 with a punching hole 19 is provided on the ceiling surface, and an air outlet 27 is provided on the back wall of the main body 1.
is provided. A heat-sensitive tube 28 is provided in the middle of the exhaust passage 25 to control the temperature inside the high-frequency heating chamber 2 when the upper heater 10 or the lower heater 12 heats the heater.

Next, the operation of this device configured as described above will be explained. To heat the food 15 with hot air, the heater 6 provided in the fan casing 5 is energized, and the fan 7 is activated. Hot air is blown into the high-frequency heating chamber 2 through the air outlet 18 to heat the food 15. After heating, the air is introduced into the communication path 16 through the air suction port 17 provided at the bottom of the high-frequency heating chamber 2 . Since a heat-sensitive tube 20 is installed in the communicating path 16 near the air suction port 17, a temperature similar to that in the high-frequency heating chamber 2 can be sensed.
This turns heater 10 or 12 OFF/ON.
By repeating this process, the temperature inside the high-frequency heating chamber 2 is set to a desired temperature.

As explained above, a communication passage that communicates with the side wall of the fan casing is formed below the bottom of the high-frequency heating chamber, and microwaves are prevented from passing through the air inlet and air outlet of this communication passage. Since the heat-sensitive tube is installed near the air suction port, it is not affected by the heat of the heater, making it possible to accurately control the temperature inside the high-frequency heating chamber. Furthermore, since microwaves do not pass through the communication path, there is no risk of micros leaking through the heat-sensitive tube, and there is no risk of sparks occurring between the heat-sensitive tube and the side wall of the communication path. This effect is achieved.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view of one embodiment of this invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is an enlarged sectional view showing part A in Fig. 2, and Fig. 4 is a sectional view taken along the - line in Fig. 1. The figure is a sectional view showing the main parts of another embodiment of this invention. 1... Main body, 2... High frequency heating chamber, 4... Back wall (of the high frequency heating chamber), 5... Fan casing,
6...Heater, 7...Fan, 16...Communication path,
17...Air inlet, 18...Air outlet, 20
...Heat-sensitive tube.

Claims (1)

[Scope of utility model registration request] An upper heater is provided on the ceiling of the high-frequency heating chamber inside the main body, and a lower heater is provided on the bottom surface of the high-frequency heating chamber. Also, on the outside of the back wall of the high-frequency heating chamber, there is a fan casing, a heater provided inside the fan casing, and a fan. In a high-frequency heating device equipped with a hot air circulation device, a communication path is provided that connects the bottom of the high-frequency heating chamber and the side wall of the fan casing of the hot air circulation device, and the air inlet and air outlet of this communication path are connected to microwaves. A high-frequency heating device characterized in that a means for preventing air from passing through is provided, and a heat-sensitive tube for turning on and off the upper heater or the lower heater is provided near the upper air suction port in the communication path.