微波炉的工作原理（The working principle of microwave oven）The working principle of microwave oven
In 1946, Spence was a fellow of Raytheon Corporation in the United states. By chance, he found that the microwave dissolved the candy. It has been proved that microwave radiation can cau molecular vibrations in food and produce heat. In 1947, the first microwave oven came out.
As the name suggests, the microwave oven is to u microwave to cook cook. Microwave is an electromagnetic wave. This electromagnetic energy than radio waves are often much larger, but also a strong "personality", microwave an encounter took place reflective metal, the metal there is no way to absorb or transfer it; microwave can pass through glass, ceramics, plastics and other insulating materials, but it will not consume energy; and water containing food, microwave not only through its energy but will be absorbed.
Microwave ovens are made with the characteristics of microwaves. The outer shell of the microwave oven is made of stainless steel and other metal materials, and the microwave can be prevented from escaping from the furnace so as not to influence the health of the people. Food containers are made of insulating material. The heart of a microwave oven is a magnetron. The electron tube, called a magnetr
on, is a microwave generator that produces microwaves with a frequency of 2 billion 450 million vibrations per cond. This invisible microwave can penetrate the food to 5cm depth, and also move the water molecules in the food. Inten movement produces a large amount of heat energy, so the food is cooked. This is the
principle of microwave heating. When cooking food from an ordinary stove, heat is always coming from the outside of the food into the food. Microwave cooking, the heat is directly into the food inside, so the cooking speed faster than other stoves 4 to 10 times, thermal efficiency of more than 80%. At prent, the thermal efficiency of other stoves can not be compared with that of other stoves.
The microwave oven, for its short cooking time, can keep the vitamins and natural flavors in the food very well. For example, cooking green peas in a microwave can almost do without vitamin C. In addition, the microwave can also disinfect and sterilize.
The u of microwave ovens should be careful not to empty "burning", becau the "empty" "burning" when the microwave energy can not be absorbed, so that it is easy to damage the magnetron. In addition, the human body contains a lot of moisture, must be stopped after the magnetron, and then open the door to extract food.
Basic structure of microwave oven全国教师信息管理系统登录
安徽民俗东坡亭Basic shape and structure of microwave oven
Door safety interlock switch - to ensure that the door is open, microwave oven can not work, the door clod, microwave oven can work;
Screen window - with metal screen, can obrve the cooking of food through the mesh;
Ventilation - ensure good ventilation during cooking;
Turntable support - drive glass turntable rotation;
Glass turntable - packed food containers placed on the turntable, heating turntable rotation, so that food cooking evenly;
The control panel control stall cooking;党课学习心得
The door switch: this switch, the door is open.
Working principle
黑夜给了我黑色的眼睛
(1) furnace chamber. The furnace cavity is a microwave resonant cavity, which is a space where microwave energy is changed into heat energy to heat food. In order to make the food in the furnace heated evenly, a special device is arranged in the cavity of the microwave oven. The microwave oven originally produced is equipped with metal fan pages at the top of the furnace cavity, that is, microwave mixers to interfere with the propagation of microwave in the furnace cavity, thus heating the food more evenly. At prent, it is loaded by a micro motor driven glass turntable at the bottom of the oven cavity of the microwave oven, the food is heated on the turntable and the disk around the motor shaft rotation, the high frequency electromagnetic field and the furnace for the relative movement, to achieve the purpo of uniform heating furnace of food. The original automatic lifting turntable makes the heating more uniform and the cooking effect more ideal.
(2) the furnace door: the door is the import and export of food, and also an important part of the chamber of the microwave oven. It is very demanding, that is, from outside the door can obrve the heating of food in the furnace cavity, but also can not let the microwave leak out. The furnace door is made up of metal frames and glass viewing windows. The glass interlayer in the obrvation window has a layer of metal microporous net, which can e the food through it and prevent the microwave leakage.
Becau the mesh size of the metal mesh in the glass interlayer is carefully calculated, the penetration of the microwave can be prevented completely.
qq登陆记录In order to prevent the leakage of microwave, the switch system of microwave oven is compod of multiple safety interlocking micro switch device. When the door is not clod, the microwave oven can not be worked, and the microwave oven doesn't work, so there is no microwave leakage.
In order to prevent the microwave oven door shut after microwave from the gap between the door and the leaking out of the cavity, the microwave oven door around with an anti groove structure, or a microwave absorbing material, such as silicone rubber by doing door als, a small amount of microwave can be absorbed leakage. Anti groove is a groove shaped structure is arranged inside the door, it has guided microwave pha reversal effect. In the anti microwave groove at the entrance, it will be the rever reflection wave offt, so microwave will not leak.
Becau the door al is easy to damage or aging effects caud by anti leakage reduction, so now most microwave ovens are ud
to prevent microwave leakage anti groove structure, rarely ud silicone rubber door als. Anti groove structure is the principle of microwave radiation on the method of preventing the leakage of
调到敌岛打特盗
microwave stable *. Guangdong Galanz enterpri (Group) by using Galanz microwave oven production company is the most advanced anti groove structure and production process, with the development of multiple anti leakage microwave technology, microwave leakage control technology has reached the international advanced level.
(3) electric circuit: the electric circuit divides the high voltage circuit, the control circuit and the low voltage circuit three parts.
自行回避
(a) high voltage circuit: after high-voltage transformer condary winding circuit is high voltage circuit, mainly including magnetron, high-voltage capacitor, high voltage transformer, high voltage diode.
(b) magnetron: the magnetron is the heart of the microwave oven, and microwave energy is produced and emitted by it. Magnetron operation requires a high pulsating DC anode voltage and a cathode voltage of 3 to 4V. The voltage doubler rectifier circuit compod of high voltage transformer, high voltage capacitor and high voltage diode provides the working voltage for magnetron to meet the above requirements.
(c) low voltage circuit: the circuit between the primary winding of the high voltage transformer and th
e microwave power inlet is a low voltage circuit, and also includes a control circuit. It mainly includes safety tube, thermal circuit
