KR100186470B1 - Microwave oven and its control method - Google Patents

Abstract

A microwave oven according to the present invention includes a sensor unit for sensing the type and quantity of food, a turntable driving unit attached to the bottom of the turntable for rotating and vibrating the turntable, And a control unit for controlling the constituent units. The liquid food is vibrated through the turntable driving unit to agitate the food, so that various flavor components contained in the cooking material of the soup and the steamed beverage are sufficiently introduced to improve the taste In addition, it is possible to prevent destruction of nutrients due to concentration of heat in the local part. Moreover, since it is possible to uniformly heat by the degree of progress, it is possible to increase the heating speed more than when heat is transferred by conduction and convection.

Description

Microwave oven and its control method

FIG. 1 is a view showing a structure of a turn table type microwave oven according to a conventional technique,

FIG. 2 is a view showing a structure of a fan-type microwave oven according to a conventional technique,

FIG. 3 shows the structure of a microwave oven according to the present invention,

FIG. 4 illustrates a driving circuit including a turntable driving unit of a microwave oven according to the present invention,

FIG. 5 is a view showing a heat transfer principle of a microwave oven according to the present invention,

6 shows the detailed structure of the turntable driving unit of the microwave oven according to the present invention,

FIG. 7 shows a control method of a microwave oven according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

1: turntable 2: magnetron

3: Fan 4: Food

5, 14: rotation motor 6:

7: control unit 8: cooking vessel

9: microwave 10: turntable driving part

11: Vibration generator 12:

13: Vibration transmitting part 14: Rotary motor

15: Magnetron drive unit 16: Timer

17:

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven, and more particularly to a microwave oven for uniformly and rapidly heating a liquid food and a control method thereof.

FIG. 1 shows a turntable-type microwave oven, which includes a turntable 1 for placing food 4, a rotary motor 5 for rotating the turntable 1, And a magnetron (2) for heating the food (4). When the turntable (1) is heated, the food is uniformly heated by uniformly exposing the food to microwaves generated in the magnetron.

However, in the case of the liquid food, since the heating is concentrated on the edge due to the dielectric constant of the water and the characteristics of the container for containing the liquid food, the rotation of the turntable is performed by the conduction in the static liquid phase and the heating by the partial convection. It takes a lot of time to heat uniformly, and in the case of nutritive foods such as milk, which are easily changed by heat, the proteins are denatured due to the severe heating of the edges, resulting in the formation of floating matters, There is a problem that nutrition is deteriorated.

FIG. 2 shows a fan-type microwave oven in which the fan 3 is attached to diffuse the microwave to diffuse the microwave to reach the food 4 in order to solve this problem. However, in the case of liquid food, the penetration depth of the microwave is as small as about 2.4 cm, so that most of the energy on the actual surface is changed into heat, and only the surface is heated beforehand.

Accordingly, an object of the present invention is to provide a microwave oven capable of uniformly and rapidly heating food by rotating and micro-vibrating food through a turntable in order to solve the above problems.

Another object of the present invention is to provide a control method for effectively controlling the microwave oven.

According to an aspect of the present invention, there is provided a microwave oven comprising: a sensor unit for sensing the type and amount of food; a turntable driving unit attached to a lower portion of the turntable to rotate and vibrate the turntable; And a controller for collectively controlling each component according to a key input of the key input unit.

According to another aspect of the present invention, there is provided a method of controlling a microwave oven, the method comprising: a first step of detecting whether a user selects liquid food heating when power is applied; A second step of magnetron driving according to a heating function; a third step of estimating the kind and amount of food by sensing gas generated from the food heated in the second step, A fourth step of adjusting the rotation and vibration intensity of the turntable according to the rate of change of resistance when the time is equal to or greater than a predetermined value; and, in the first step, if the liquid food is not heated, And a fifth step of turning off the light emitting diode.

The present invention will now be described in more detail with reference to the accompanying drawings.

As shown in FIG. 3, the microwave oven of the present invention includes a turntable 1 for placing food 4, a turntable driving unit attached to the bottom of the turntable 1 for rotating and vibrating the turntable 1, (2) for heating the food (4) by emitting microwaves, a sensor unit (6) for sensing the gas generated during heating and estimating the type and amount of the food, And a control unit 7 for controlling the rotation and vibration of the turntable driving unit according to the detection result of the sensor unit 6 and for controlling the respective components in an integrated manner.

A magnetron driving unit 15 for driving the magnetron in addition to the magnetron 2 and the sensor unit 6 and a magnetron driving unit 15 for driving the magnetron 2 and the sensor unit 6, A timer 16 for displaying time and the like, a key input unit 17 for allowing the user to select cooking, and the like. As shown in FIG. 4, the turntable driving unit 10 includes a timer A vibration generating unit 11 for generating vibrations using a vibration motor or a sound wave generator or the like and a vibration generating unit 11 connected to the vibration generating unit 11 and having one side contacted with the rotary shaft 12, The vibration energy is transmitted to the liquid food placed on the turntable and the turntable through the rotary shaft 12, and the vibration energy is transmitted to the liquid food placed on the turntable and the turntable. Such that the food itself in the cooking vessel (8) vibration, as shown.

That is, in the present invention, generally, a temperature range of high temperature, middle temperature, and low temperature is generated in the cooking vessel due to the microwave and the penetration depth of heat due to the permittivity of the food. If there is no vibration, (A) and height (B) are small, and the frequency and the vibration time are different from each other. In this case, Thereby making it possible to prevent the food and beverage in the cooking container from escaping to the outside.

6, the vibration transmission portion 13 of the turntable driving portion 10 includes a vibration transmission shaft 13-1 fixed and supported by the vibration generating portion 11, -1) and a rotary wheel 13-2 which is freely rotatable on the other side of the rotary shaft 12, and the rotary wheel is in contact with the rotary shaft 12 to transmit vibration and is not disturbed by the rotation of the rotary shaft 12 Free rotation is possible.

As shown in FIG. 7, when the power is inputted and the liquid food heating is selected in the cooking selection by the user, the following operation is performed. Otherwise, the normal mode is performed. And turns off the magnetron when cooking in the normal mode is finished.

On the other hand, when the liquid food heating is selected, the timer and the magnetron are turned on to heat the food.

At this time, gas is generated while the food is heated. In the sensor part, the resistance low change rate (dG = change resistance / initial resistance) is continuously calculated by converting the initial gas amount and the gas amount after a certain time into a resistance value, The type and amount of food can be indirectly estimated.

Then, when a certain period of time has elapsed from the time when the user starts to drive the magnetron, the rate of change in resistance is recognized as a value of K, and the value of K is compared with the reference A and B (AB) Between B and B, and controls the time and intensity of vibration.

At this time, the timer is reset and used for time measurement at the time of vibration.

That is, if the K value is equal to or greater than A, the vibration mode is rotated at rpm of N1 according to the type and amount of the food, and then rotated to N2 when a predetermined time T2 elapses. When the predetermined time T3 elapses, When it is determined that the constant time T4 has elapsed, it is determined that the uniform heat is generated and the magnetron and the vibration motor are turned off.

The process of dividing the rpm of the vibration motor into three stages and operating in the same manner is applied to the portions A and B and the portion B below.

As described above, according to the present invention, by vibrating the liquid food and stirring the food, various flavor components contained in the ingredients can be sufficiently improved during cooking of soup and stew, and the taste can be improved. And it is also possible to uniformly heat by vibration, so that the heating speed can be increased more than when heat is transferred by conduction and convection.

Claims (7)

A sensor unit for sensing the type and amount of food, a turntable driving unit attached to the bottom of the turntable to rotate and vibrate the turntable, and a control unit for controlling the respective components according to the sensing result of the sensor unit and the key input of the user And a microwave oven. The turntable driving unit according to claim 1, wherein the turntable driving unit includes a rotating motor for generating a rotating force, a vibration generating unit for generating vibration, and a vibration transmitting unit for transmitting vibration generated in the vibration generating unit to the rotating shaft . The microwave oven according to claim 2, wherein the vibration generating unit comprises a vibration motor. The microwave oven according to claim 2, wherein the vibration generating unit comprises a sound wave generator. A second step of magnetron driving according to a selected liquid food heating function when the liquid food heating is selected in the first step; A third step of measuring the type and amount of the food by sensing the gas generated from the heated food and indicating the type and amount of the food by the rate of change of resistance; and, if the heating time by the magnetron drive exceeds a predetermined value, A fourth step of controlling the intensity of the microwave oven, and a fifth step of turning off the vibration motor by operating in an operation mode for cooking a general food, unless the liquid food is heated in the first step. 6. The control method of a microwave oven according to claim 5, wherein the fourth step of adjusting the rotation and vibration intensity of the turntable is performed by dividing the vibration into three stages. 6. The microwave oven according to claim 5, wherein the fourth step of adjusting the rotation and vibration intensity of the turntable is such that the vibration width and the vibration height are reduced so that the food does not deviate to the outside, Control method.