Turbine manufacturers complete specifications and price concessions, good brand to find weather vane, blade design drawings ..

Edit: Standard Electrical Co., Ltd. Shenzhen wind turbine experts more price and specifications, please visit our official website Ali: Complete specifications //fbemf2014.1688.com/ fan factory price, good brand to find weather vane, blade design drawings: http drawing methods and procedures standard "fan energy efficiency limit value and energy efficiency rating" clearly put forward for the ordinary fan motors (except for air conditioning by external rotor motor centrifugal fan) to use the region as the highest fan efficiency ηr energy efficiency rating assessment value, the actual measurement during the most critical is how to exactly get the fan impeller mechanical power. Most existing testing laboratories an important basis for the direct use of the nominal efficiency of the motor nameplate as fan efficiency calculations, in fact, with the actual power falls far short of the impeller shaft, the accuracy is quite low. Author based on years of laboratory experience, combined with the national standard GB / T1236-2000 "industrial fan duct using standardized performance tests" in the fan shaft power measurement requirements, sorting out the practical test several possible methods, and the advantages and disadvantages of each method are compared to test officers for reference. 1 Reaction dynamometer test method This method is the use of bracket-style fan motor or the torque dynamometer to measure torque, speed and torque is calculated according to the motor output power. Direct form of an electric motor as an example: Pa = n (W- △ W) / 9550 where Pa is the fan impeller shaft power; n is the motor speed; when W is dynamometer load torque; △ W for the dynamometer empty torque load. This method is the most original and most basic test method, this method to test the fan impeller shaft power is more direct and accurate. However, this method requires a ventilator, the company offers matching hp dynamometer (balance bed), the accuracy of measurement of the load is ± 0.2%, to determine the accuracy of the torque arm length should reach ± ??0.2%. Before and after each test in the balance need to check the zero torque (weight), it should be the maximum measured during the test of the difference in the range of 0.5% [1]. 2 torque meter method This method is mainly measured by the torque measuring instrument live motor output power needs to be separated from the motor fan unit, and by coupling the three transmission line connected at the same level, through the power of the motor torque meter Transfer to the fan impeller, blower impeller shaft power measured by the torque meter. This method is suitable for motor external to the ventilator fan of the unit, it is easy disassembly and connection of the motor. In this method, the most critical is the motor and fan impeller center position, how to ensure that the motor and blower wheel torque meter and three even in the same center line as it relates to operational performance curve of the motor. The disadvantage of this method is that the limitations of relatively large, is not suitable for some built-in fan motor unit, and the other, the need to process a large number of different sizes to match the coupling and the motor shaft, and the installation is more complex. The advantage of this method is to measure the data for the next point of the actual operating conditions the fan impeller shaft power, with the change of test load changes, the accuracy is relatively high.