JP2863733B2 - Thermopile cooling device for microwave oven and control method therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermopile cooling device for a microwave oven and a method for cooling the same, and more particularly, the temperature of a thermopile rises above a predetermined temperature even when the temperature of a heating chamber rises. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermopile cooling device for a microwave oven and a control method therefor, which can perform accurate cooking and improve the reliability of automatic cooking of a microwave oven.

[0002]

2. Description of the Related Art In a conventional microwave oven, as shown in FIG. 6, a hollow hexahedral frame 10 having an open whole surface is formed, and a case 1 is placed on the outer side of the frame 10 to cover the case. A heating chamber 7 is formed in the center of the space of the frame 10, and an electrical equipment room 9 is formed in the space of the side frame 10 of the heating chamber 7.
The door 2 having the control panel unit 3 was detachably mounted on the front open surface of No. 0. A cooking heater 16 is mounted on the upper side inside the heating chamber 7, and a high-voltage transformer 5 and a cooking magnetron 6, and a cooling fan motor 8 for cooling the high-voltage transformer 5 and the magnetron 6 are installed in the electrical equipment chamber 9. And had been fitted.

[0003] As a function of the conventional microwave oven configured as described above, when food is put into the heating chamber 7 and the control panel 3 is operated to cook according to a desired menu, the magnetron 6 or the heater 16 is used. Works. In this case, a fan (not shown) is rotated by the driving of the cooling fan motor 8, and external air flows into the electrical equipment room 9 to cool the heating of the magnetron 6 and the high-voltage transformer 5. When cooking is performed, automatic cooking cannot be performed by detecting the amount of infrared rays of the food in the heating chamber 7.

[0004]

However, in such a conventional microwave oven, when the temperature of the magnetron and the high-pressure transformer 25 rises during cooking, the cooling temperature of the magnetron and the high-pressure transformer may be lowered to 100 ° C. or less. However, there is an inconvenience that a thermopile, which is excellent in sensing heat of infrared rays but is weak to heat, cannot be applied, and good automatic cooking cannot be performed using microwaves and heaters. SUMMARY OF THE INVENTION It is an object of the present invention to provide a thermopile cooling device for a microwave oven capable of sensing an infrared amount using a thermopile even when cooking is performed by operating a heater and performing accurate automatic cooking, and a cooling method thereof. .

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heating chamber having a heater for heating a cooking object and heating the cooking object, and a heating chamber mounted on a side of the heating chamber. A microwave oven comprising a magnetron and a high-pressure transformer, a cooling fan and a fan drive motor mounted on the side of the magnet for heating the food and the high-pressure transformer, and sucking external air, the microwave oven being mounted on a predetermined portion of the upper surface outside the heating chamber. A thermopile which can be used for both microwave cooking and heater cooking; a cold air flow path guide mounted on the outer upper surface of the thermopile side heating chamber to guide the sucked external air to the thermopile side; and The sucked external air mounted above the fan and the fan drive motor is cut off between the cold air flow path guide side and the magnetron and high voltage transformer side. It is achieved by providing an air duct for flowing the thermopile cooling device of a microwave oven constructed from a.

Further, according to the present invention, when the ambient temperature of the thermopile becomes equal to or higher than a predetermined temperature, the thermostat on the side of the thermopile is turned off, and the cooling fan motor is driven at high speed so that a large amount of air can be sucked in from the outside. Rotating the fan motor and rotating the fan motor at a constant speed when the peripheral temperature of the thermopile decreases to the predetermined temperature due to the high speed rotation of the fan motor. This is achieved by providing a method for controlling a thermopile cooling device.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In the thermopile cooling device for a microwave oven according to the present invention, as shown in FIGS. 1 and 2, a hollow hexahedral frame 100 having an open entire surface is formed, and a heating chamber 107 is provided in the hollow center of the frame 100. Forming the heating chamber 1
07, a heater 116 for cooking food is mounted on the upper side, and an iron plate 107a is laid above the outer surface of the heating chamber 107, and a thermopile 109 is provided at a predetermined central position on the iron 107a.
Is installed. Moreover, the side frame 1 of the heating chamber 107
00 space, an electrical equipment room 103 is formed.
A bottom plate and a side plate are respectively formed on the bottom surface and the side surface of the heating chamber 107, and a plurality of air suction holes 110 are formed in predetermined portions of the bottom plate.
3, a motor housing 104 having a cooling fan 115 and a fan motor 108 is housed therein.

Further, a magnetron 106 for heating the food and a high-pressure transformer 105 are mounted inside the side electric compartment 103 of the motor housing 104.
An air duct 111 is mounted on the upper side of the side motor housing 104, and a duct guide 112 is swingably engaged with an upper part of the air duct 111. A solenoid valve 114 is provided at a predetermined portion of the air duct 111. The external air sucked from the air suction port 110 by being driven by the cooling fan motor 108 flows into the air duct 111, and then passes through the duct guide 112 to the electric equipment room 1039 side or the upper surface of the heating chamber 107. Flows into the thermopile 109 side. Further, as shown in FIG.
A pair of cool air flow path guides 113 formed in a curved shape in a predetermined shape is mounted on the side of the thermopile 109 of 07a, and external air flowing through the duct guides 112 is guided by the cool air flow path guides 113. After the cooling, the thermopile 109 quickly flows into the thermopile 109 side.
9 is mounted with a thermostat 118 for sensing the ambient temperature. And the whole open part of the frame 100 is
A door 2 having a control panel unit 3 is mounted as in the conventional case.

The operation and control method of the thermopile cooling device for a microwave oven according to the present invention will be described below. First, when food is put into the heating chamber 107 and cooking is performed by selecting a microwave cooking key, the solenoid valve 114 of the air duct 111 is operated and the duct guide 112 swings in the direction IIIa in FIG. Motor 108
And the rotation of the cooling fan 11, the air inlet 11
External air sucked in from 0 flows into the electrical equipment room 103 sequentially through the air duct 111 and the duct guide 112, and the cooking proceeds while the magnetron 106 and the high-pressure transformer 105 are cooled.

On the other hand, when cooking of the heater 116 is selected,
Cooking is performed by the heater 116 in the heating chamber 107, and the operation of the solenoid valve 114 causes the duct guide 112 to swing in the direction IIIb in FIG.
The external air sucked from the air inlet 110 by the driving of the air cooler 115 and the constant speed rotation (rpm1) of the cool air fan 115 sequentially passes through the air duct 111 and the duct guide 112, and then flows along the cool air flow path guide 113 in FIG. The thermopile 109 flows into the thermopile 109 side, and the temperature rise of the thermopile 109 is suppressed.

Next, when the cooking time is prolonged and the temperature of the thermopile 109 rises and is detected to be 90 ° C. or higher by the thermostat 118, as shown in FIGS. 4 and 5, the thermostat 118 is turned off and cooled. The fan motor 108 rotates at a high speed (rpm2) by applying the high voltage V2, and a larger amount of external air flows into the thermopile 109 along the air duct 111, the duct guide 112 and the cold air flow guide 113, and the thermopile 109 Temperature rise is further suppressed. Then, the thermopile 1
09 to 90 ° C. and the thermostat 11
8, the thermostat 118 is turned on, the cooling fan motor 108 is rotated at a constant speed (rpm1) by application of the low pressure V2, and such a state is repeated to perform cooking. When the cooking set time is reached, cooking ends.

That is, as shown in FIG. 4, when the peripheral temperature T of the thermopile 109 is higher than a predetermined temperature T ₁ (for example, 90 ° C.) (sections Δt ₁ and Δt ₃ in the figure), the thermostat 118 is turned on. Turn off the cooling fan motor 10
High voltage V2 is applied to 8 and it rotates at high speed (rpm2). Next, when the ambient temperature T of the thermopile 109 is lower than a predetermined temperature T1 (for example, 90 ° C.) (sections Δt ₂ and Δt ₄ in the figure), the thermostat 118 is turned on, and the low pressure is applied to the cooling fan motor 108. V1 is applied,
It rotates at a constant speed (rpm1).

[0013]

As described above, the thermopile cooling device for a microwave oven and the control method therefor according to the present invention include a thermopile, an air duct having a thermostat and a duct guide for suppressing a rise in temperature of the thermopile, When cooking for heaters, the thermopile is normally operated to perform cooking, so the thermopile operates normally during cooking for microwaves and cooking for heaters, and automatic cooking is accurately performed to cook microwave ovens. There is an effect that reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of the internal configuration of a microwave oven provided with a thermopile cooling device according to the present invention.

FIG. 2 is an exploded perspective view (A, B) showing a part of the thermopile cooling device according to the present invention.

FIG. 3 is an explanatory diagram of a state of inflow of intake air to a thermopile side according to the present invention.

FIG. 4 is a graph showing the relationship between the ambient temperature of the thermopile and the rotation speed of the fan motor according to the present invention.

FIG. 5 is a control flowchart of a thermopile cooling device according to the present invention.

FIG. 6 is a perspective view of the internal configuration of a conventional microwave oven.

[Explanation of symbols]

 103 ... Electrical room 104 ... Motor housing 106 ... Magnetron 107 ... Heating room 108 ... Fan motor 109 ... Thermopile 110 ... Suction port 111 ... Air duct 112 ... Duct guide 113 ... Cold air flow path guide 114 ... Solenoid valve 115 ... Fan 116 ... Heater 118 ... thermostat

Claims (2)

(57) [Claims] 1. A heating chamber which has a heater for heating a cooked material and which heats the cooked food, and which is vertically arranged in an electric compartment beside the heated chamber.
A heated magnetron and a high-pressure transformer,
In the cooling fan and the cooling fan drive motor and a microwave oven with inhaling external air is disposed on the side of the food heating magnetron and high voltage transformer, it is arranged in the outer upper surface of said heating chamber, refining by microwave a thermopile used at the time of cooking and cooking by a heater; and a thermopile disposed on an upper surface of the outside of the heating chamber on a side of the thermopile to guide the sucked external air to the thermopile.
A cooling air flow path guide provided with a thermostat for cooling the thermopile and detecting an ambient temperature of the thermopile, and disposed above the cooling fan and the cooling fan drive motor in the electrical equipment room , and sucked external air. Is formed in a hollow cylindrical shape to flow into the cooling air flow path guide side and the magnet for heating the food and the high-pressure transformer ,
A hollow cylindrical duct guide is swingably engaged with the upper part.
And the duct guide is connected to the cooling air passage guide.
To the side and the magnetron and high-pressure transformer for heating the food
Install a solenoid valve for switching inflow
A thermopile cooling device for a microwave oven, comprising: an air duct; 2. A heater for heating a food having a heater for heating the food.
Heating room to be installed, and placed vertically in the electrical equipment room on the side of the heating room
A heated magnetron and a high-pressure transformer,
Side of the magnetron and high-pressure transformer for heating the food
Cooling fan and cooling fan
Motor and a heater arranged on the upper surface of the outside of the heating chamber.
Used when cooking with black wave and cooking with heater
Detecting a thermopile and a temperature around the thermopile;
A thermostat, and a method for cooling a thermopile in a microwave oven, comprising: when an ambient temperature of the thermopile is equal to or higher than a predetermined temperature,
The thermostat is turned off, a high pressure is applied to the cooling fan drive motor, whereby by the cooling fan drive motor rotates at a high speed, the thermopile
When a predetermined amount of air flows in from the outside, and when the peripheral temperature of the thermopile decreases to a predetermined temperature due to high-speed rotation of the cooling fan drive motor, the thermostat is activated and a low pressure is applied to the cooling fan drive motor. by the cooling fan drive motor is rotated at a low speed thereby, from the external to the thermopile
Controlling the inflow of air in the microwave oven.