The latest edition of the China Association of Automobile Manufacturers, "China Automotive Industry Production and Sales Update," showed that in April 2011, vehicle production and sales for the first time in a single month showed the first negative growth of 27 months since February 2009. The continuous tightening of macroeconomic policies, withdrawal of incentives for purchase of cars, restrictions on purchases in some cities, and the tight supply chain of the industry caused by the Japan earthquake have finally made the Chinese auto market take its first step since the global financial crisis of 2008. . Compared with the vehicle market, the performance of the automotive engine market is even worse. In the first 4 months, the sales of vehicle engines exceeded 6 million units In April 2011, 55 automotive engine companies, including statistics, produced and sold engines of 1,364,300 units and 1,393,400 units respectively, representing a year-on-year decrease of 16.80% and 18.24% respectively from the previous month, and a month-on-month decline from the previous month. 54.84 and 53.64 percentage points; a decrease of 6.30% and 7.31% respectively from the same period in 2010. From January to April, vehicle engines were cumulatively sold and sold 5,829,300 units and 6,087,800 units, respectively, an increase of 0.91% and 2.12% respectively year-on-year. According to production statistics, from January to April 2011, among a total of 55 vehicle engine companies, Chongqing Changan, SAIC-GM-Wuling, FAW-Volkswagen, Shanghai GM Powertrain, Chery, Liuzhou Wuling Liuji, Guangxi Yuchai, and Dongfeng Nissan Passenger cars, Beijing Hyundai, Shanghai Volkswagen, FAW Group, Weichai Holdings, Anhui Quanchai, Shenlong, and Geely Holdings, ranked among the top 15 in terms of cumulative production volume. Compared with the previous month, the most obvious change was that Dongfeng Nissan Passenger Vehicle dropped by two places, FAW Group also dropped by two at the same time, and the situation was affected by the supply of Japanese cars and Japanese parts and components companies. In terms of production scale, the number of companies with an average monthly output of more than 10,000 units from January to April 2011 remained at 44. This was the same as last month. The number of companies with an average monthly output of more than 20,000 units was 29, and the average monthly output was There are 18 companies with more than 30,000 units, 12 companies with an average monthly output of more than 40,000 units, and 8 companies with an average monthly output of more than 50,000 units, which are the same as last month. Although the monthly production and sales volume in April had a decrease of 16.80% and 18.24%, respectively, compared with the previous month, in terms of cumulative volume, the production and sales volume from January to April still maintained positive growth compared with the same period of last year, which proved the market It has not yet entered a real turning point. Yuchai led the market for diesel engines in April In terms of vehicle diesel engines, the 23 diesel engine companies included in the statistics in April 2011 completed production and sales volume of 337,400 units and 366,600 units, respectively, a decrease of 12.89% and 13.52% from the previous quarter, respectively, a year-on-year decrease of 0.15% and an increase of 3.74%; 1 From April to April, the cumulative production and sales volume were 1,425,400 units and 1,157,700 units, respectively, down 2.68% and 3.71% year-on-year respectively. Specifically, there are still 11 diesel engine companies that have an average monthly output of more than 10,000 units from January to April. The ranking of these 11 companies by production volume is: Guangxi Yuchai, FAW Group, Weichai Holdings, Anhui Quanchai, Dongfeng Motor, Kunming Yunnei, Dongfeng Chaochai, Shandong Huayuan Laidong, Jiangxi Jiangling, China National Heavy Duty Truck and Weichai Power Yangchai. Among the diesel engine companies, the cumulative growth in the cumulative production of companies with average monthly production (more than 3,000 units) was more prominent than in the previous year: Dongfeng Limited Commercial Vehicle (cumulative YoY growth rate of 94.26%), Shandong Huayuan Laidong (58.40%) , Shanghai Diesel Engine (37.40%), Jianghuai Automobile (33.12%), Great Wall Motor (31.13%), Nanjing Automobile Group (28.20%), Qingling (26.59%) and Weichai Holding (26.21%); cumulative production is negative growth Companies include Yuchai (-25.87%), China National Heavy Duty Truck (-17.41%), Dongfeng Chaochao (-14.59%), Anhui Quanchai (-13.10%), FAW Group (-9.15%) and Weichai Power Yangchai. (-0.36%). It is worth noting that the diesel engine lead company Guangxi Yuchai led the diesel engine market with a large drop of 25.87%; and Kunming Yunnei, which has performed poorly in the first three months of this year, has increased by 25.16% from the previous month and the same period of the previous year respectively. 60.13%, cumulative year-on-year growth also changed from negative to positive (1.80%).
Aluminum extruded finned tubes using the form of the base tube covered with aluminum tube(the base tube can be carbon steel, stainless steel, copper) through machine extrusion, forming a tube fin, the fin base and the tube outer wall is close fitting, this fin tubing control can make finned tubes with high heat transfer coefficient and heat transfer performance.
Aluminum extruded finned tubes, also called [integral finned tubes" using the form of the base tube covered with aluminum tube(the base tube can be carbon steel, stainless steel, copper) through machine extrusion, forming a tube fin, the fin base and the tube outer wall is close fitting, this fin tubing control can make finned tubes with high heat transfer coefficient and heat transfer performance. Extruded finned tube can be made of iron, copper or aluminum tube by compound rolling, which has the advantages of tight bonding, small thermal resistance, good heat transfer performance, high strength, small flow loss, strong anti-corrosion performance, not easy to deformation under long-term hot and cold working conditions, long working life and so on.
Extruded finned tube manufacturing process
Pipe line--compressing or rolling--strip peeling--washing--pressure test--blast blowing--packaging.
The extruded fin tube is formed by a bimetallic tube consisting of an aluminum outer tube and an inner tube of almost any material. The fin is formed by rolling the material from the outside of the outer tube to provide an integrated fin with excellent heat transfer performance and life. The extruded fins provide excellent corrosion protection for the base tube.
The production method of the composite finned tube mainly includes the extrusion method: the bimetallic composite tube is lined with a mandrel, and driven by the rotation of the roller blade, the composite tube is processed on the outer surface through the cavity formed by the rolling groove and the core head Out fins. The heat transfer tube produced by this method is an organic whole with its outer tube and fins, so there is no problem of contact heat loss, and it has good performance and high heat transfer efficiency.
Extruded finned tube advantage
Compared with the ordinary wound finned tube, the contact thermal resistance remains stable in a large range with the temperature change, so the heat transfer performance of the bimetallic aluminum extruded finned tube is better than the spiral fin tube in the limit tube wall temperature range.
In addition, compared with the coiled tube, the bimetallic aluminum extruded fin tube has outstanding corrosion resistance and high strength, it can withstand 4.0MPa water pressure cleaning, the fins still do not fall down, the base of the bimetallic aluminum extruded tube. The tube can be selected according to the corrosion of the fluid in the tube and the processing technology. The base tube can be carbon steel, copper, stainless steel, etc.
Extruded finned tube applications
Extruded finned tubes are the main equipment for air coolers and are commonly used as heat exchangers in power plants (electric, nuclear, thermal and geothermal). Steam condensate system. Chemical and petrochemical industries. Food processing plants and refrigeration technology. Industry (steel mills, incinerators, gas compression facilities). Petrochemical, power plant and power plant renovation, air conditioning and refrigeration, boilers, finned tube economizers and air preheaters. Maximum working temperature is 280°C-300°C.
Aluminum Extruded Tubing,Extruded Aluminum Tube,Extruded Aluminum Tubing,Extruded Fin Tubes Murphy Thermal Energy Co., Ltd. , https://www.murphyfinnedtube.com
Engine production and sales in April showed negative growth