JPH0552603U - microwave - Google Patents

Abstract

(57) [Abstract] [Purpose] The microwave oven of the present invention thaws (ice-melts) frozen food by microwave heating, heats and evaporates the ice-melted water of the frozen food with a heater, and vaporizes the evaporated water vapor. The purpose is to detect the sensor and finish the thawing of frozen foods in the optimum state. [Structure] A heating chamber 3 is provided in the range main body 1, a magnetron 5 is provided in a side wall 4 of the heating chamber 3, an exhaust duct 12 is provided in a side wall 10 of the heating chamber 3, and a humidity sensor 13 is provided in the exhaust duct 12 for heating. A water storage recess 15 is provided in the bottom plate 14 of the chamber 3, and a heater 16 is provided outside the bottom portion 14.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a microwave oven for heating and thawing frozen foods by microwaves from a magnetron.

[0002]

[Prior Art]

 Conventional microwave ovens are equipped with a weight sensor that measures the weight of food in the heating chamber, and the heating (thawing) time is set based on the weight of the food detected by this weight sensor, and microwave heating is performed only during that heating time. The frozen food was thawed and finished.

In addition, a humidity sensor for detecting moisture (steam) generated from food is provided in the heating chamber, and the defrosting finish of the frozen food is detected and controlled by the detection result of the humidity sensor used during normal heating and cooking. It is possible.

[0004]

[Problems to be solved by the device]

 In the microwave oven equipped with the above weight sensor, the heating (thawing) time is set only by the weight of the frozen food, so the finished state may vary due to differences in the initial temperature and shape of the frozen food, and the optimal The thawed state could not be obtained.

Further, in a microwave oven equipped with a humidity sensor, the amount of water (steam) generated is very small when the frozen food is thawed (thawed), and the detection level of the humidity sensor is low. When the detection level increased, the thawed food was already warm, so the humidity sensor could not be used to detect the defrosting completion of frozen food.

The microwave oven of the present invention has been made in view of the above problems. It thaws (freezes) frozen foods by microwave heating and heats and melts the iced water of the frozen foods with a heater. The purpose is to detect the vaporized water vapor with a humidity sensor and finish the thawing of frozen foods in an optimal state.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the microwave oven of the present invention is a microwave oven that thaws frozen food in a heating chamber by a microwave from a magnetron. A water storage recess for storing water is provided, a heater for heating and evaporating the water stored in the water storage recess is provided, and a humidity sensor for detecting water vapor generated by heating the heater and detecting the finish of thawing the frozen food is provided. ing.

[0008]

[Action]

 The microwave oven with the above configuration heats frozen food by the microwave from the magnetron, and the water generated by the frozen food that is thawed by this heating flows through the bottom of the heating chamber and flows into the water storage recess at the bottom of the heating chamber. Be done.

The water stored in the water storage recess is heated and evaporated by a heater, the evaporated water vapor is detected by a humidity sensor, and the optimum state of thawing of frozen food is detected by the detection result of the humidity sensor. Finish thawing.

[0010]

【Example】

 An embodiment of the microwave oven of the present invention will be described with reference to FIGS.

In the microwave oven of the present invention, the microwave oven main body 1 is provided with a heating chamber 3 for heating the frozen food 2, and one side wall 4 of the heating chamber 3 is provided with a magnetron 5 for generating a microwave for heating the frozen food 2. And a waveguide 6 for guiding the microwave from the magnetron 5 to the heating chamber 3.

An opening is provided at a connection portion of the waveguide 6 of the heating chamber 3, and the opening is closed by a waveguide cover 7 so that steam and the like in the heating chamber 3 does not leak. There is.

Blower side punching holes through which cooling air (cooling air after cooling the magnetron 5) from the magnetron cooling fan 8 provided in the range main body 1 is blown to one side wall 4 of the heating chamber 3. 9 is provided.

An exhaust side punching hole 11 is provided in the other side wall 10 of the heating chamber 3, and an exhaust duct 12 is provided for exhausting exhaust gas from the exhaust side punching hole 11 to the range main body 1 side. A humidity sensor 13 for detecting vapor (humidity) contained in the exhaust gas is provided in the exhaust duct 12.

Then, a water storage recess 15 for storing the water generated from the frozen food 2 by the microwave heating of the magnetron 5 of the bottom plate 14 of the heating chamber 3 is provided, and the water storage recess 15 is provided outside the bottom 14. A heater 16 for heating the accumulated water is provided.

The operation of thawing frozen food such as raw food in the microwave oven having the above configuration will be described.

First, when the frozen food 2 is put into the heating chamber 3 and the defrosting operation is started, the magnetron cooling fan 8 and the heater 16 are energized to start the operation.

By blowing air from the magnetron cooling fan 8, water droplets and the like adhering to the surface of the frozen food 2 and the heating chamber 3 are cleaned, and the humidity in the exhaust air discharged to the exhaust duct 12 is measured by the humidity sensor 13. When the detected humidity reaches the first predetermined value a, it is determined that the cleaning is completed, and the magnetron 5 is energized.

Then, the frozen food 2 is heated by the microwave from the magnetron 5, and the water defrosted by the heating flows through the bottom portion 14 of the heating substance 3 into the water storage recess 15 and then into the water storage recess 15. The water is rapidly heated and evaporated because the water storage recess 15 is heated by the heater 16 and becomes high temperature at the same time as the thawing operation.

When the exhaust containing the steam vaporized by heating is discharged to the exhaust duct 12 and the humidity detected by the humidity sensor 13 reaches the second predetermined value b, it is determined that the frozen food 2 is thawed, and the magnetron 5 is discharged. The power supply to the magnetron cooling fan 8 and the heater 16 is cut off, and the defrosting operation is completed.

At this time, since the water content of the frozen food 2 that has been thawed is immediately released as water vapor into the air, it is not necessary to take time to directly generate water vapor from the frozen food 2, and the frozen food 2 can be smoothed. It never gets warm.

[0022]

[Effect of the device]

 The microwave oven of the present invention is provided with a water storage recess at the bottom of the heating chamber for storing water generated by freezing of frozen food, a heater for heating and evaporating the water stored in the water storage recess, and heating by the heater. Since a humidity sensor that detects water vapor and detects the finish of thawing of the frozen food is provided, the moisture generated by the freezing of the frozen food can be immediately released into the air as water vapor. It is possible to detect the thawing of frozen foods, and it is possible to finish the thawed foods in an optimum thawing condition regardless of the shape and weight of the frozen foods without warming the thawed foods.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a microwave oven of the present invention.

FIG. 2 is a time chart showing an operation state of each constituent element of the microwave oven of the present invention.

FIG. 3 is a characteristic diagram showing the humidity generated by frozen food during the thawing operation of the microwave oven of the present invention.

[Explanation of symbols]

 1 Range main body 2 Frozen food 3 Heating chamber 5 Magnetron 13 Humidity sensor 15 Water storage recess 16 Heater

Claims (1)

[Scope of utility model registration request] 1. A microwave oven for thawing frozen food in a heating chamber by a microwave from a magnetron, wherein a bottom of the heating chamber is provided with a water storage recess for storing water generated by the freezing of the frozen food, and the water storage recess is reserved. A microwave oven comprising a heater for heating and evaporating the obtained water, and a humidity sensor for detecting water vapor generated by heating the heater to detect the finish of thawing of the frozen food.