Most people now know that LED is a new source of energy saving and emission reduction. But there is still a big advantage that is often overlooked, that is, pollution-free and environmentally friendly.
We know that mercury is an extremely toxic substance. However, most of the high-efficiency electric light sources currently used contain mercury. The mercury content of various electric light sources is shown in the following table:
26mm fluorescent lamp metal halide lamp high pressure sodium lamp energy saving lamp (10mm) various LED
25-45mg20-25mg12-14mg10-15mg0
Mercury has a very low boiling point and can evaporate at normal temperatures. After a waste discarded light source is broken, it immediately emits mercury vapor to the surrounding area, which instantly makes the concentration of mercury in the surrounding air reach 10-20 mg/m3, exceeding the maximum allowable concentration of mercury in the air (0.01 mg/cubic). M) is 1000 to 2000 times. According to a study of mercury at Stanford University in the United States, 1 milligram of mercury is enough to contaminate 5454.5 kilograms of drinking water, making it impossible to meet safe drinking standards. The consequences of air and water pollution caused by mercury are very serious. After being eaten by aquatic organisms, CH3Hg is produced. This is a highly toxic substance, as long as the half ear spoon can cause death. Mercury itself destroys the central nervous system, and the effects of reproductive defects are also very serious. Mercury can also damage the kidneys and liver, and can even cause death at a sufficient dose. Mercury can be transferred in different ways in the soil, in the water stream, and even in the atmosphere and food chain. Therefore, persistence, easy migration and high bioaccumulation make mercury one of the most attractive environmental pollutants in the world. The most serious mercury poisoning incident in history was the case of Japan's Minamata disease, when hundreds of people died as water in Minamata was contaminated with mercury. Now the Japanese government has learned the lesson that all discarded fluorescent lamps must be treated with toxic substances, so that those who purchase ordinary fluorescent lamps must pay twice as much to pay for this toxic substance disposal fee.
Recently, the Chinese government has distributed 100 million energy-saving lamps free of charge. Although the mercury content of special low-mercury energy-saving lamps can be reduced to less than 5 mg (I don’t know if the Chinese government issued such low-mercury energy-saving lamps), Nor does it reduce its hazard, because one such low-mercury energy-saving lamp contains enough mercury to contaminate 27.27 tons of drinking water. And 100 million energy-saving lamps are enough to pollute 2.7 billion tons of water, which is equivalent to the drinking water of the people of the country for several years.
Because China does not have a special recycling agency and recycling regulations, most fluorescent lamps and energy-saving lamps are buried like ordinary garbage. Regardless of whether fluorescent lamps or energy-saving lamps are made of extremely fragile glass, the mercury must be Will run out, and because of the high proportion of mercury, it is easy to sink and penetrate into the groundwater, and then be consumed by humans and animals. The consequences are unimaginable. In particular, the vast majority of the people are almost ignorant of the dangers of mercury. The photo below was taken by a writer at a bus stop in the downtown area of ​​Xujiahui, Shanghai. The picture shows a broken billboard, a lot of glass fragments of fluorescent lamps, and the author walked there every day, actually 2 No one has been processed for many weeks. It can be seen that the relevant departments are ignorant of the dangers of the broken fluorescent lamps.
In addition, all electric light sources that use mercury vapor to emit light use electrons to bombard mercury vapor to generate ultraviolet light. This ultraviolet light is also an environmental pollution. Its main wave is 2537 angstroms = 2537 x 10-10 m = 253.7 nm, which is called UV-C ultraviolet ray. The energy consumed is 60% convertible to ultraviolet light, and the other energy (?40%) is converted to heat. The light is absorbed by the light-emitting material on the surface of the tube, and the light is released. Different light materials emit different luminosity. The efficiency of converting "ultraviolet light" to "light" is 40%. Therefore, the efficiency of daylight? is 60% x 40% = 24% large? It is three to five times the same power? That is to say, 100%-(40%+24%)=36% of the ultraviolet rays are not converted into other energy and directly hit the glass tube wall. 36% of the UV-passage glass bulbs have a 94% failure, so it is possible to have 36% x 6% = 2.16% UV-C pass glass bulbs. UV-C is considered to be DeepUV on the human body, and it hurts. The United States GE Qi? company recommended that human exposure to fluorescent light should not exceed 16 small? The damage caused by ultraviolet rays to the human body is the total amount accumulated. This is crucial for those girls who love beauty.
Not only that, but also energy-saving lamps and fluorescent lamps. A Taiwanese scholar measured the microwave radiation of his home energy-saving lamps. The results are as follows. When the lamp is not turned on, the microwave radiation measured in the room is 0.011 microwatts per square centimeter (0.011 ???W/cm2) in the range of 0.5-3 GHz. After opening a 60W incandescent lamp, the result is as follows. The microwave value is unchanged; after replacing with a 15W energy-saving lamp, the microwave value is as high as 50 microwatts per square centimeter (50 ???W/cm2), which is 5000 times that of an incandescent lamp. It is replaced by a 26W energy-saving lamp with a microwave radiation value of up to 100 microwatts per square centimeter (100 ???W/cm2), which is 10,000 times that of incandescent lamps, almost higher than that of mobile phones. The national microwave hygiene standard is 50 microwatts/cm2, so it has exceeded the national microwave hygiene standards. The electromagnetic wave intensity of the 15-watt energy-saving lamp is about 70 milligauss, and the electromagnetic wave intensity of the 26-watt energy-saving lamp is 80 milligauss. The 60-watt incandescent lamp is almost zero. Because the mechanism of the fluorescent lamp and the energy-saving lamp are exactly the same, the microwave radiation of the fluorescent lamp is only higher than that of the energy-saving lamp, and never lower than the energy-saving lamp. And this kind of microwave radiation can cause a feeling of dizziness. It is not known as to what diseases will be caused. Japanese studies have shown that people who work long hours in front of a computer have twice the probability of getting glaucoma than others. It is important to know that a computer's LCD monitor is also backlit with a cold cathode fluorescent lamp similar to a fluorescent lamp.
The LED lamp is a completely environmentally friendly product that is completely free of mercury, and it does not have ultraviolet radiation, but its driving power source has extremely low microwave radiation. The use of this new light source completely eliminates all kinds of pollution, so it can be called a true green light source.
Thermal Overload Relays are protective devices used for overload protection of electric motors or other electrical equipment and electrical circuits,It consists of heating elements, bimetals,contacts and a set of transmission and adjustment mechanisms.
Our Thermal Overload Relays had been divided into five series(as follow),with good quality and most competitive price,had exported into global market for many years:
LR1-D New Thermal Relay
LR2-D Thermal Relay
LR-D New Thermal Relay
LR9-F Thermal Relay
Intermediate Relay
The working principle of the thermal relay is that the current flowing into the heating element generates heat, and the bimetal having different expansion coefficients is deformed. When the deformation reaches a certain distance, the link is pushed to break the control circuit, thereby making the contactor Loss of power, the main circuit is disconnected, to achieve overload protection of the motor.
As an overload protection component of the motor, the thermal relay has been widely used in production due to its small size, simple structure and low cost.
Thermal Overload Relay,Telemecanique Overload Relay,Thermal Digital Overload Relay,Telemecanique Model Thermal Relay
Ningbo Bond Industrial Electric Co., Ltd. , https://www.bondelectro.com