JPH07217899A - High frequency heating device - Google Patents

Abstract

(57) [Summary] [Structure] In a high frequency heating apparatus having a magnetron 8, a cooling fan 10 for cooling the magnetron 8 and the like, and an exhaust port 3 for exhausting steam in the heating chamber 1, a high frequency heating device is provided in the vicinity of the exhaust port 3. An air blow guide 13 that guides the cooling air from the cooling fan 10 and a temperature sensor 7 where the sensor unit 7b faces the air outlet 14 of the air blow guide 13 are provided. [Effect] During high-frequency heating, the vapor generated from food is captured by the temperature sensor installed near the exhaust port immediately before being discharged from the exhaust port, and between the temperature sensor cooled by the cooling air from the air guide. Heat is transferred, and heating is controlled by changing the resistance value of the temperature sensor. Further, when the heater is heated, the temperature inside the heating chamber is detected by the temperature sensor to control the temperature inside the heating chamber, so that the temperature sensor can be shared and the cost can be reduced. Furthermore, since the sensor part of the temperature sensor is arranged outside the heating chamber, there is no dew condensation on the sensor part and there is no concern about corrosion due to steam.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency heating device with a heater for detecting the heating state of food and automatically cooking it.

[0002]

2. Description of the Related Art Conventionally, in a high frequency heating apparatus of this type, heating control is performed by detecting the amount of steam discharged from a heating chamber by using a humidity sensor, a vaporization sensor or the like during high frequency heating. Further, when heating the heater, it is necessary to control the temperature inside the heating chamber to a constant temperature, and the heating is controlled using a temperature sensor.

[0003]

In the above conventional technique, a sensor for heating control during high frequency heating and a sensor for heating control during heating of the heater are required, which is a factor of high cost. .

Further, since the sensor is provided at a location exposed to the exhaust gas from the heating chamber, there is a problem in corrosion resistance and reliability is low.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a high frequency heating including a magnetron, a cooling fan for cooling the magnetron and the like, and an exhaust port for discharging steam in the heating chamber. In the device, a blower guide for guiding cooling air from a cooling fan and a temperature sensor having a sensor portion facing the blowout port of the blower guide were provided near the exhaust port.

[0006]

With the above structure, during high frequency heating, vapor generated from food is captured by the temperature sensor provided in the vicinity of the exhaust port immediately before being discharged from the exhaust port and cooled by the cooling air from the air guide. Heat is exchanged between and, and heating is controlled by a change in the resistance value of the temperature sensor. Further, when the heater is heated, the temperature inside the heating chamber is controlled by detecting the temperature on the side surface of the heating chamber with a temperature sensor. further,
Since the sensor part of the temperature sensor is located outside the heating chamber, there is no condensation on the sensor part and there is no concern about corrosion due to steam.

[0007]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan sectional view of a high frequency heating apparatus showing an embodiment of the present invention, and FIG. 2 is a sectional side view of the same.

In these figures, 1 is a box-shaped heating chamber having an opening on the front surface. A duct 4 is joined to an air inlet 2 provided on the side surface 1a of the heating chamber 1, and
An exhaust duct 5 is joined to the exhaust port 3 provided in the upper part of b. Reference numeral 6 denotes a hole provided in the lower portion in the vicinity of the exhaust port 3, and a temperature sensor 7 having a thermistor 7b as a sensor unit bonded to the center of a stainless steel plate 7a having a plate thickness of 0.1 mm as shown in FIG. It is attached to the thermistor 7b in a state where no steam hits it. 8 is the heating chamber side surface 1a
The magnetron 9 is a heater. 10
Is a cooling fan provided on the rear plate 11 of the main body for cooling the magnetron 8 and the like, and 12 is an opening formed in the rear plate 11 of the main body. Reference numeral 13 is a blower guide that guides cool air from the cooling fan 10, and its outlet 14 is attached to the heating chamber side surface 1b so as to face the sensor portion 7b of the temperature sensor 7. Reference numeral 15 is a food product stored in the heating chamber 1, 16 is a door pivotably supporting the opening of the heating chamber 1, and 17 is an operation panel.

Next, the operation of this embodiment will be described.

When the heating by the high frequency is started, the food 15
Steam is generated from. On the other hand, the outside air is taken in through the opening 12 by the cooling fan 10, and the cooling air that has cooled the magnetron 8 is guided to the duct 4 and enters the heating chamber 1 through the air inlet 2 of the heating chamber side surface 1a and is generated from the food 15. It is discharged from the exhaust port 3 together with the steam (the flow of the cooling air is shown by the solid line arrow, and the flow of the steam is shown by the broken line arrow). Since the temperature sensor 7 attached to the hole 6 on the side surface 1b of the heating chamber is cooled by the cooling air A from the cooling fan 10 guided by the blower guide 13, the surface temperature of the temperature sensor 7 is lower than the temperature of exhaust gas. If steam is included, dew will form on the surface of the stainless steel plate 7a of the temperature sensor 7, and the resistance value of the temperature sensor 7 will change. This is shown in FIG. FIG. 5 is a circuit diagram using the temperature sensor 7. By controlling heating at this time, food 1
5 can be heated automatically.

Since the cooling fan 10 does not operate during heating by the heater 9, the temperature sensor 7 is located on the side surface 1b of the heating chamber.
Is detected, and the temperature in the heating chamber 1 is controlled to a predetermined temperature. As described above, one temperature sensor 7 can control heating during high frequency heating and during heater heating.
Since the sensor part of the temperature sensor is located outside the heating chamber, there is no condensation on the sensor part and there is no concern about corrosion due to steam.

[0013]

As described above, according to the present invention, a magnetron,
In a high-frequency heating device having a cooling fan that cools a magnetron and the like, and an exhaust port that discharges steam in the heating chamber, a blower guide that guides cooling air from the cooling fan near the exhaust port and a sensor part Since the temperature sensor facing the air outlet is provided, during high-frequency heating, the steam generated from the food is captured by the temperature sensor provided near the air outlet immediately before being discharged from the air outlet. Heat is exchanged with the temperature sensor cooled by the cooling air, and heating is controlled by the change in the resistance value of the temperature sensor. Further, when the heater is heated, the temperature inside the heating chamber is detected by the temperature sensor to control the temperature inside the heating chamber, so that the temperature sensor can be shared and the cost can be reduced. Furthermore, since the sensor part of the temperature sensor is arranged outside the heating chamber, there is no dew condensation on the sensor part and there is no concern about corrosion due to steam.

[Brief description of drawings]

FIG. 1 is a plan sectional view of a high-frequency heating device showing an embodiment of the present invention.

FIG. 2 is a side sectional view of the same.

FIG. 3 is also a structural diagram of the sensor.

FIG. 4 is a sensor output waveform diagram of the same.

FIG. 5 is a sensor output circuit diagram of the same.

[Explanation of symbols]

 1 Heating chamber 1b Side surface 3 Exhaust port 6 Hole 7 Temperature sensor 7b Sensor part 8 Magnetron 9 Heater 10 Cooling fan 13 Blower guide 14 Blowout port 15 Food

Claims (1)

[Claims] 1. A high-frequency heating device comprising a magnetron (8), a cooling fan (10) for cooling the magnetron (8) and the like, and an exhaust port (3) for discharging steam in the heating chamber (1), Blower guide (13) for guiding cooling air from the cooling fan (10) near the exhaust port (3)
And a temperature sensor (7) in which the sensor part (7b) faces the outlet (14) of the blower guide (13).