The inevitability of microwave pollution and microwave oven leakage
When the human body is close to the microwave radiation source (such as the working microwave oven), it can complain of dizziness, sleep disorder, memory loss, bradycardia, blood pressure drop and so on due to excessive radiation energy. It was found that when the human eyes were about 30cm near the leakage point of the microwave oven and the microwave leakage reached 1mW/cm2, they suddenly felt dizzy, and the fundus examination showed a little bleeding above the macula of retina.
The heating cavity of the microwave oven is made of metal, so the microwave can't penetrate. The oven door glass of microwave oven is made of a special material. Generally, safety protection measures such as metal protective net, oxygen carrier rubber, oven door sealing system and door lock system are designed to prevent microwave leakage. The most vulnerable part of the human body is the lens of the eye. If the eyes are exposed to microwave radiation that exceeds the safety regulations for a long time, their eyesight will decline and even cause cataracts. In order to protect users' health, the International Electrotechnical Commission and relevant departments of our country stipulate that the leakage of microwave at 5 cm outside the microwave oven door should not exceed 5 MW/cm2.
As for the problem of microwave leakage, it should be said that it is the first factor to be solved in the manufacture of microwave ovens. At present, manufacturers can only adopt passive sealing and hierarchical chain circuit breakers. The most primary way is called mechanical leakage prevention, which mainly relies on the sealing of the oven door to prevent microwave leakage. However, some famous foreign microwave oven manufacturers use the characteristics of microwave itself and adopt the structure of surround suppression to minimize the microwave leakage in the whole furnace. Advanced electronic control mechanism can cut off the working power supply of magnetron in time to ensure that microwave does not leak. Such as three-stage interlocking protection technology for blocking microwave leakage. Three-level interlocking includes first-level interlocking device, second-level interlocking device and strategy device. The primary interlocking device can stop the magnetron in an instant; The secondary interlocking device is the double insurance of the primary interlocking device. If the primary interlock protection fails, the secondary interlock device will immediately undertake the task of blocking the magnetron from emitting microwaves. In the case that the above two lines of defense fail to perform their duties, the third line of defense policer will short-circuit the current and open the fuse. In this way, the microwave disappears. It should be noted that it is very inefficient to make policer work. Generally speaking, the first two lines of defense are enough to block microwave ovens, thus preventing microwave leakage.
When the microwave leaked from the microwave oven propagates in space, its depletion degree is roughly inversely proportional to the square of the distance from the microwave oven. That is to say, if the microwave oven leaks 10 MW per square centimeter at the oven door, the space outside 1 meter is only 0.005438+0 MW. What's more, the actual leakage of microwave oven door is much lower than this value. International standards strictly stipulate that the microwave leakage of microwave ovens should not be greater than 5 milliwatts per square centimeter. The technical requirements of some domestic manufacturers are controlled within 1/5 of the international standard, that is, 1 milliwatt per square centimeter, which is 1/50 leaked from the international standard.
Professionals suggest that consumers should neither ignore microwave radiation nor be too nervous. As long as the choice is reasonable and used properly, we can fully enjoy the comfortable life brought by high technology.
Since microwave leakage of microwave oven is inevitable, how to avoid it? According to the working principle of microwave oven, microwave leakage can only occur around the door. With the increase of distance, microwave radiation decays quickly. According to the national standard, the microwave leakage must be controlled within 1mW/cm2 (load) at a distance of 5cm from the microwave oven. At present, the microwave leakage of microwave ovens sold in the market can basically be controlled within the limits stipulated by the national standard, especially the microwave leakage of some well-known brands such as Haier in China has reached several tenths or even one percent of the national standard.
1. According to the current national conditions, the kitchen is relatively small, so we must leave enough space for the microwave oven, and make a good plan before buying it, otherwise it will become a "minefield" when using the microwave oven.
2, the use of microwave oven must be in accordance with the provisions of the manual operation correctly, so as to avoid artificial expansion of microwave oven leakage. After the microwave oven is used for a period of time, the oven door should be regularly checked for mechanical damage. If it can't be turned on normally, it should be sent to a professional department for maintenance in time to prevent microwave leakage.
Only by purchasing good quality products can we reduce the leakage of microwave. Today, the price of microwave oven is greatly reduced (I spent 2000 yuan when I bought it), on the one hand, the cost of technological progress is reduced, and I am afraid of cutting corners from time to time.
Remember to stay away from the microwave.