U-tube refers to a heat exchange tube shaped like a U, which is an important part of a U Type heat exchanger. Advantages of U-shaped tube: The U-shaped tube heat exchanger has only one tube plate, both ends of the tube are fixed on the same tube plate, the tube can be stretched freely, no thermal stress, and the thermal compensation performance is good; the tube side adopts double tube side, The process is longer, the flow rate is higher, the heat transfer performance is better, and the pressure bearing capacity is strong. The tube bundle can be drawn out from the shell, which is convenient for maintenance and cleaning, and the structure is simple and the cost is cheap. The disadvantage of the U-shaped tube is that due to the limitation of the radius of curvature of the bend tube, the arrangement of the heat exchange tubes is less, the innermost tube spacing of the tube bundle is relatively large, the utilization rate of the Tube Sheet is low, and the shell-side fluid is easy to form a short circuit, which is harmful to the transmission. When the tubes are leaked and damaged, only the U-shaped tubes at the periphery of the tube bundle are easy to replace. If the inner heat exchange tube is damaged, it cannot be replaced, but can only be blocked. Moreover, one damaged U-shaped tube is equivalent to two damaged tubes, and the scrap rate is relatively high.
U-tube,U Shaped Tube,Bundle Tubes,U Tube Bundle Guangdong Jiema Energy Saving Technology Co.,Ltd , https://www.heatexchangerjiema.com
Going abroad is not only in tourism, study abroad, business investigation, investment, etc., but also in the LED lighting industry. The overseas fever of China's LED lighting industry is actually more and more LED manufacturers' lamps and lanterns are exported to foreign countries. Although there are some shortcomings in the high-end market, the share of Chinese LED lamps in the global market cannot be ignored. However, as more and more LED lamps are exported to foreign countries, the quality problems of Chinese LED lamps are also rising more and more. When the products go abroad, their quality problems also went abroad. In recent years, domestic LED lighting products have been on the black list, and have been notified by dozens of quality issues in the EU. For the healthy and sustainable development of the LED industry, LED enterprise reform is urgent. .
Under the background of the country's vigorous promotion of energy-saving emission reduction and low-carbon economy, the LED lighting industry is developing rapidly. According to data from the Ministry of Industry and Information Technology, from January to April 2011, investment in the LED industry maintained rapid growth, with an investment of more than 30 billion yuan and a growth rate of over 90, making it a veritable investment hotspot. At present, China has initially formed four major semiconductor lighting industry cluster areas in the Pearl River Delta, Yangtze River Delta, Northern Region, Jiangxi and Fujian regions, and the initial construction of epitaxial wafer production, chip preparation, package integration and LED application industry chain.
At present, China's efforts to promote energy conservation and emission reduction have increased, and the pace of eliminating incandescent lamps has accelerated markedly; the recovery in the European and American markets has been obvious, and the incandescent lamp bans in major countries and regions around the world have begun to implement many domestic institutions that believe that with the awareness of energy conservation and environmental protection With the rise, the decline in product prices and the advancement of technology, the era of LEDs replacing traditional light sources has arrived. It is expected that the global LED lighting market will grow by 90 in 2014. As the main production base of global LED lighting, China will usher in explosive growth.
The scale and growth of China's LED lighting market is affected by many favorable policies. It is expected that the domestic and international markets will continue to expand, and the prospects for the LED industry will be promising in the next few years. Chinese companies have been able to fully meet the needs of the international market with increasingly sophisticated technology and low prices. In the future, China's LED companies must strive to stabilize the domestic market and further explore the international market, as well as from the establishment of independent brands and timely updating of technology.
While welcoming the favorable and prepared opportunities, many companies and industry insiders also found that many funds and enterprises flooded into the LED lighting industry, LED lighting production capacity is relatively surplus, and low brand awareness still plagued the entire LED lighting industry. It's not that easy for companies to achieve explosive growth. Although the export volume of LED companies in China is increasing every year and the market share is expanding, most of them are OEM, which is not conducive to the long-term development of the industry. The relevant person in charge of the China Lighting Association said.
Li Yuheng, a senior researcher at CIC, also feels that the plagiarism of domestic products is prevalent, which in the short term can bring considerable profits to enterprises, but the ability to sustain development is not strong.
Yang Zhilin, manager of Xiamen Yutai Electronics Co., Ltd. also reflected that some domestic enterprises are competing for the market, at the expense of product quality, and constantly lowering prices, which makes us companies very passive.
In addition, Dan Hengyi, outdoor sales manager of Ningbo Cixi Hengrun Electric Co., Ltd. said that due to the continuous encouragement policy in the past two years, his company is also actively exploring the domestic market, such as the recent large-scale cooperation with Carrefour and Century Lianhua. Supermarket talks about cooperation. However, the policy has been introduced, and it will take time to implement it. In addition, the domestic market is not open enough, some bidding processes are not transparent, and domestic consumers' recognition of LED lighting has yet to be cultivated, and whether the market can be developed remains to be seen.
For these problems, the person in charge of the above-mentioned China Lighting Electrical Appliances Association suggested that we must first speed up brand building and raise the awareness of domestic independent brands in the international market. In this regard, we can learn from the practices of some companies, such as acquiring and acquiring some local brands, and using the brand effect of local products to enhance the influence of our products on the local. Secondly, intelligent lighting must be a direction for the future development of the lighting industry. How to break through some obstacles such as technology and price existing in intelligent lighting has become an urgent problem for the industry.
Li Yuheng also said that the multiple benefits of policy are both opportunities and challenges. While welcoming the good, enterprises should also pay attention to production standardization, process modularization, continuous improvement of research and development capabilities, and expansion of sales channels. When competing with foreign companies, in terms of product quality and technology. Further improvement is needed; more importantly, innovation is the most important.
Low price, uneven quality With the rapid development of LED lighting industry in China, the export trend of LED lamps is good, but the quality problems accompanying the industry are not mature enough. Many small and micro enterprises are low-cost and low-cost. Operation and low quality control have led to frequent product quality problems. It is not uncommon for large enterprises to have quality problems. It can be seen that quality problems have become an obstacle to the development of the domestic market. However, there is currently no way to solve this problem, depending on the market environment of non-standardization. At present, low-cost and low-quality LED lamps are flooding the market, which is related to the current situation of the Chinese market and also related to the Chinese LED lighting industry.
Nowadays, the obstacles to the quality problems of Chinese LED lamps have been extended to foreign countries. The quality of 37 Chinese LED lighting products notified by the EU non-food rapid warning system last year cannot be ignored. In the past two years, the issue of China's LED lighting exports has attracted the attention of some places in China. The Fuzhou Inspection and Quarantine Bureau recently stated that the LED lamps and lanterns exported have signs and instructions that are not standardized, the temperature of the lamp body is too high, the structure is unreasonable, and the components are Not meeting the standards and other issues.
The LED lighting export market has gradually recovered, and it has already begun to appear at the beginning of this year. The markets in Europe, America, Japan and South Korea have recovered, and emerging markets such as North Asia, Southeast Asia and South Africa have foreseen a new round of export market demand. Zhu Zewu, an expert with in-depth knowledge of the European and American markets, also said: European and American markets, especially the US market, have picked up since last year, and the demand for LED lamps has also increased. Therefore, the domestic high-end export-oriented LED lighting companies for the European and American markets This year's situation will be better.
This year, the export data of the LED lighting industry has been frequently reported. According to China Customs statistics, in 2012 China's LED lighting exports amounted to about 5.8 billion US dollars. The inspection and quarantine bureaus of several cities in Zhejiang said that the export of LED lamps has risen sharply, both above 30. In addition, LED lamps in Fujian Province maintained a high growth trend. In 2012, the value of exports reached US$47.722 million, an increase of nearly 10 times compared with 2010. In the first quarter of this year, Fujian Province exported 280 batches of LED lamps with a value of US$15.739 million, an increase of 23.35 and 130.32 respectively.
However, while the export of LED lamps is growing rapidly, the phenomenon of quality problems in some products has also surfaced: the entry threshold for production enterprises is low, and the foreign standards are unfamiliar; the quality awareness of enterprises needs to be strengthened, the products lack quality assurance; the supervision and quarantine supervision needs to be strengthened. Strengthen, risk analysis of LED lighting products.
What is puzzling is that it is a good thing that the growth rate of China's LED lighting export market is so fast, but will the number of notifications increase greatly? When quality problems meet the increasingly high thresholds in foreign countries, what should Chinese LED companies do? In the past two years, the EU, the United States, Mexico and other markets have increased the energy efficiency requirements for LED products. In the face of this obvious technical barrier, Chinese LED companies may open up emerging markets in the Middle East market, mainly in the middle and low-end products, although emerging markets The quantity is still not comparable to the European and American markets; or understand and pay attention to the regulations and directives issued by the international community, especially the EU, to avoid quality problems from the source of product design, although the technical threshold is high; or strictly in accordance with the relevant standards of the country of export, not Will blindly follow the requirements of foreign customers.
In the face of the drawbacks of LED homogenization competition, how can the industry develop healthier? Chinese enterprises have won international business opportunities while improving their manufacturing capabilities, and they are often overlooked because they do not respect intellectual property rights. Chinese manufacturers lack awareness of the protection and application of patents, and are often passively involved in intellectual property and patent disputes. Many other companies have resorted to fraud, attempting to take shortcuts, intentionally copying, and imitating other people's products, which has tarnished the reputation of China's entire LED industry, resulting in the poor reputation of China's LED display and LED lighting products in the international market.
A large number of OEM products have also made China's own products rarely accepted and recognized by the US market, resulting in the fact that Chinese LED products have no brand in the US market. Once a large number of products leave the port, they do not know where they are shipped, and they do not know who the terminal buyers are. Consumers also don't know which of these good products are produced, and brand awareness is even more difficult to talk about.
The homogenization competition among Chinese companies is very fierce. We provide nearly 70% of OEMs in Europe, but the profits are reduced by their own disorderly competition and price wars, forming a vicious circle of low profits. No innovation and patent rights protection.
All these grim facts have once again triggered everyone's thinking. Where should China's LED companies go? I am willing to continue to cooperate with foreign companies, even to provide them with OEM services, and to take a little leftovers in the international market with cheap labor. Or independent innovation, owning own patents and core competitiveness, taking the road of differentiated competition, researching and developing products that can compete with international amnesty, and being a respected and admired enterprise? The aspirations and branded Chinese companies must take the latter.
A well-known LED company in China believes that as a well-known brand enterprise, it should always be clearly aware that only by taking the road of independent innovation and differentiated competition, we will produce products with independent patents, core technologies and unique performances, and strive to build China. National brands, going to the world stage. For more than 20 years, products have entered the world and started to enter the world. Not long ago, the 800 square meters full-color LED display once again settled in Times Square, New York, USA, was once again highly praised by American experts. Its color and brightness deviation rate is far superior to industry standards, and it is rated as the best of New York Times Square. Color LED display.
Xiao Bian Comments: The development of LED lighting has proved that those companies that started at the time of the momentum, but did not pay attention to market analysis and product research, blindly follow the trend to expand production capacity, in the end, either short-lived or difficult. Nowadays, China's LED products occupy a large share of the international market at a low price, but low-priced and low-quality products are always second-rate or even third-rate products, and will eventually be defeated by high-quality products. Looking at the current situation of China's reforms, as well as the central government's industrial policy of retreating from the people, we are constantly asking us to constantly study new technologies, recognize the new situation, and lay out in advance. As an important energy-saving industry, LED lighting does not rely on China's and international energy conservation and emission reduction policies, take advantage of the trend, actively research and develop new technologies, adhere to the path of sustainable development with quality and quantity, and get rid of the second-rate and third-rate aspects. What?