1, different uses
Microwave ovens are mainly used to heat food. There is a rotatable agitator near the entrance of the cooking cavity. Because the agitator is a fan-shaped metal, it can reflect microwaves in all directions after rotation, so it can evenly distribute microwave energy in the cooking cavity, thus heating food. The power range of microwave oven is generally 500 ~ 1000 watt.
Oven is an electric appliance that uses the radiant heat of electric heating elements to bake food. It can be used to make roast chicken, roast duck, toast, cakes and so on. According to the different needs of baking food, the temperature of electric oven can generally be adjusted within the range of 50-250℃. (microwave oven)
2, the principle is different
Simply put, the principle of microwave heating is that when microwave is radiated to food, food always contains a certain amount of water, and water is composed of polar molecules (even if there is no external electric field, the positive and negative charge centers of molecules do not coincide), and the orientation of this polar molecule will change with the microwave field.
Due to the movement of polar water molecules in food. As well as the interaction between adjacent molecules, it produces a phenomenon similar to friction, which makes the water temperature rise, so the temperature of food also rises.
The food heated by microwave is heated at the same time, so that the whole object is heated evenly and the heating speed is fast. It heats food 5 cm deep at a frequency of 2.45 billion times per second, accelerating the operation of molecules.
Ordinary household electric ovens include automatic temperature regulation, automatic timing and automatic temperature regulation timing products. This electric oven is mainly composed of a box, an inner cavity, a heating element, a temperature controller, a timer and accessories such as a power cord, a baking tray, a baking net, a handle fork and the like.
The surface of the shell is sprayed with colored amino baking paint, and the inner cavity is detachable. The grilles on both sides can adjust the height of the baking tray and baking net as required. Most oven doors adopt spring structure, with high-temperature tempered glass transparent window in the middle.
The heating elements include metal tubular heating elements, opalescent timely glass heating elements and flaky far infrared radiation heating elements. The thermostat on the panel is the control system of the electric oven, and its working status is displayed by red and green indicator lights.
The thermostat adopts bimetallic temperature control elements, and the timer is generally mechanical. Some electric ovens also have power switches, which can control the surface fire and the bottom fire respectively, so that different temperatures can be obtained. (oven)
3. Different purchase requirements
Basic requirements for purchasing microwave ovens:
1. Microwave ovens are products listed in the first batch of national compulsory safety certification (CCC certification). Consumers must choose products with CCC certification mark, corresponding factory code and certification certificate number when purchasing. In order to verify the authenticity of certification marks and certificates, you can log on to the official website of China National Certification and Accreditation Administration for online inquiry of certification certificates.
2. Check whether the instruction manual, certificate of approval, warranty card and accessories of the product are complete.
3, carefully check the product identification and instructions. The national mandatory standard GB4706.2 1-2002 "Special Requirements for Safe Microwave Ovens for Household and Similar Electrical Appliances" stipulates.
The identification of microwave oven products should be clear and standardized, and the contents should include: trademark, model, specification (such as capacity), rated voltage, rated input power, symbol of power supply nature, name of manufacturer, rated output power, etc.
Instructions should have warnings to prevent misuse and detailed cleaning methods; The operating switch mark on the product should be clear and reliable.
4. Check the appearance. Appearance should be smooth, uniform color, no obvious color difference. In addition, microwave ovens generate microwaves. Pay special attention to the sealing condition of the door and whether the door interlock device is normal when purchasing.
Pay attention to the following points when purchasing an electric oven:
1, and the thermal efficiency of electric oven is over 60%.
2. The time for the temperature of the inner cavity to rise from room temperature to 200℃ should not exceed 65438 05 minutes.
3. The temperature of the electric oven with automatic temperature control should be adjustable within the range of 100-250℃, and the temperature control error should be less than 10%.
4. For the electric oven with automatic timing control, the control time should be continuously adjustable within 0-45 min, and the travel time error is less than 10%.
Reference source:
Baidu encyclopedia-oven
Baidu encyclopedia-microwave oven