Traditional lighting flourishes According to the statistics of the Lighting Society, the total sales of the domestic lighting industry in 1999 was 45 billion yuan, reaching 55 billion yuan in 2000, 68 billion yuan in 2001, and 80 billion yuan in 2002. The speed of % is increasing rapidly. In 2004, China's lighting market has exceeded 110 billion yuan. The output value in 2005 is expected to reach 130 billion yuan. It is estimated that in 2006 and 2007, the consumption capacity of domestic lighting products will be approximately 150 billion yuan and 180 billion yuan. The Chinese lighting market with great potential is not only favored by domestic merchants, but also provides a position for competition of foreign merchants. With the adjustment of industrial structure in developed countries, some labor-intensive industries have been transferred to developing countries, PHILIPS, GE, OSRAM, etc. Internationally renowned lighting companies have established factories in China, and other well-known foreign manufacturers have also deliberately waited. Although this has increased the pressure on domestic enterprises, it has played a certain role in promoting the progress of the industry. Experts analyze that in the next 5-10 years, China's lighting industry will continue to maintain steady growth. New semiconductor (LED) lighting – leading the third revolutionary wave With the continuous innovation of luminescent materials and illuminating technology, semiconductor technology has set off a new revolution in the field of lighting – semiconductor lighting. Semiconductor (LED) lighting products, especially gallium nitride-based (GaN) white LED lighting sources are small in size, light in weight, good in directionality and resistant to various harsh conditions, and are incomparable in terms of power consumption, life and environmental protection. The superiority. With the breakthrough of the third generation semiconductor material GaN and the advent of blue, green and white LEDs, semiconductor lighting tools are expected to replace the dominant position of traditional incandescent lamps, fluorescent lamps and halogen lamps, and become a widely used energy-saving and environmentally-friendly high-quality light source. Mainstream products in the lighting industry. Some even commented that semiconductor lighting brought "the third revolution in the field of lighting", "the significance is no less than the first two torches represented by human beings and the first incandescent lamp represented by Edison." The revolution in the field of sub-lighting. "At present, LED as a "technology to illuminate the future" has been valued by more and more countries. According to scientific predictions, by 2008, the global LED output value will increase from $12.5 billion in 2004 to $50 billion. According to the US Department of Energy's research report, by 2010, 55% of incandescent lamps and fluorescent lamps in the United States will be replaced by semiconductor lamps. The annual electricity cost will reach 35 billion US dollars, and semiconductor lamps are expected to form a large industry of 50 billion US dollars. The South Korean government has also spent $100 million to develop its own LED lighting industry. Japan has proposed that in 2006, semiconductor lamps will be used to replace traditional incandescent lamps on a large scale. At present, the United States GE, the Netherlands Philips, Germany Osram three world lighting production giants have cooperated with semiconductor companies to form a semiconductor lighting company to seize the industrial commanding heights, the goal is to make semiconductor lighting a new source of light in the 21st century. As a new high-efficiency solid-state light source, semiconductor lighting has significant advantages such as long life, energy saving, safety, and environmental protection. Its power consumption is only 1/10 of that of ordinary lighting. Chen Lianghui, an academician of the Chinese Academy of Engineering and a researcher at the Institute of Semiconductors of the Chinese Academy of Sciences, calculated this account: "As long as one-third of the incandescent lamps are replaced by semiconductor lamps, the country can save 100 billion kWh of electricity every year, which is equivalent to saving. The annual power generation of a Three Gorges Project (the Three Gorges Project with a total investment of 180 billion yuan, the annual power generation is 84.68 billion kWh). It can be seen that the promotion of semiconductor lighting will be one of the effective means of saving energy. In 2003, with the support of the “863†program, the Ministry of Science and Technology of China established the “National Semiconductor Lighting Project†Coordination Leading Group and began to promote semiconductor lighting projects from the national level. And it will be included in the "Tenth Five-Year" national science and technology research plan, the national medium and long-term science and technology planning. In 2004, the Ministry of Science and Technology determined the focus of work - the development of new lighting industry, and identified Xiamen, Shanghai, Dalian and Jiangxi Nanchang as the first four national semiconductor lighting industry bases. Through the support of the "863" plan and other scientific and technological plans, a relatively complete industrial chain, such as epitaxial wafer production, chip fabrication, device package integration and application, is initially formed, with a view to forming an industrial cluster with advantages, supporting capabilities, and public testing services. Drive the development of the entire industry. China's LED industry has a certain technology and industrial base. The domestic LED chip index has reached the level of foreign mid-range products. The LED packaging technology has a small gap with foreign countries. It has occupied a considerable share in the international market and is likely to achieve key technological breakthroughs. In addition, the chip packaging and lighting application industry located in the downstream of the industrial chain is not only a technology-intensive industry, but also a labor-intensive industry. China has a comparative advantage in labor, so it has the ability to undertake the transfer of the international semiconductor lighting industry. LED lighting mainly includes signal lights, decorative landscape lighting, home lighting, and automotive lights. There are many cities in China. There are nearly 20,000 traffic lights in Beijing alone. It is necessary to replace the existing traffic lights with LEDs. The market prospect is very broad. Decorative landscape lighting is currently the main application market for LED lighting. It is also relatively mature in China. Some cities have adopted LED lighting products in urban lighting projects. It is expected that with the development of the city construction for the 2008 Beijing Olympic Games and the 2010 Shanghai World Expo, the application of LED lights in urban landscape lighting will be further expanded, and the demand will further increase. There are 300 million households in China. If LED lighting tools are widely used in home lighting, this market will be very huge. LED lighting for automotive lamps is also a big market. Some high-end cars in the United States, Japan, and Europe have begun to use LED lighting. With the development of China's economy, the automobile and motorcycle industries are developing rapidly, and their supporting products are car lights and motorcycles. The demand for lamps will also rise simultaneously. According to industry insiders, by 2010, only LED industry in China can form an output value of 50 billion yuan. The entire LED and related application industry will reach a scale of 360 billion yuan.
The forced circulation pump does not rely on the centrifugal force of the impeller to the liquid, but uses the thrust of the rotating impeller blades to make the sent liquid flow along the direction of the pump axis. When the pump shaft is driven by the motor to rotate, because the blade has a certain helix angle with the axis of the pump shaft, a thrust (or lift) is generated on the liquid, and the liquid is pushed out and discharged along the discharge pipe. When the liquid is pushed out, a partial vacuum is formed at the original position, and the liquid outside will be sucked into the impeller along the inlet pipe under the action of atmospheric pressure. As long as the impeller keeps rotating, the pump can continuously suck in and discharge liquid. The forced circulation pump works by using the horizontal thrust along the direction of the pump axis generated by the rotation of the impeller, so it is also called a horizontal axial flow pump. Mainly used in the evaporation of diaphragm method caustic soda, phosphoric acid, vacuum salt production, lactic acid, calcium lactate, alumina, titanium dioxide, calcium chloride, ammonium chloride, sodium chlorate, sugar, molten salt, paper, waste water and other industries. Concentration and cooling, in order to improve the production capacity of the equipment, increase the heat transfer coefficient of the heat exchanger for forced circulation. Therefore, it can also be called an axial flow evaporative circulation pump.
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