Weak current College】 【fan selection general method.

Fan selection is a highly technical work, specific selection method is also very much, for example: press the dimensionless characteristic curve selection, according to a logarithmic curve selection, press the coordinates have dimensional characteristics curve or performance table selection, the variant type, press the network selection, current resistance is through Web-based selection system and application specific selection software selection. Methods for complex, some method of Mastering requires some expertise.
For the average business person, familiar with and learn from time performance table selection and fan dedicated selection software both methods. These two methods for easy operation. Selection of the blower, the first under the fan of the air flow and total pressure these two basic parameters by fans for a dimensional properties table (various fan product brochure has a related data) to determine the model number and machine fan, then you may have more than one product to meet the requirements; when combined with a fan uses, technological requirements, use the occasion, and so on, select the type of fan and structure materials, and other models to meet the required conditions of work, and strive to make fans rated flow and pressure rated, as close as possible to the technological requirements of flow rate and pressure, thus allowing the fan run time using the operating point close to the fan characteristics of highly effective area. Specific principles are as follows:

1) before choosing fan, you should understand the internal fan for production and product quality, such as the production of fan varieties, specifications, and various special-purpose products, new product development and marketing, etc but also should take full account of environmental protection requirements, in order to merit-based selection of the blower.

2) according to fan the physical gas transportation, chemical properties, select the different uses of the fan. Such as conveying an explosive and flammable gas or dust explosion-proof fan; or conveying coal powder should choose dust or powder fan; transporting corrosive gas of anticorrosion fans should be selected; in high temperature situations work or transport high temperature gases such as high temperature fan should be selected.

3) select the fan performance charts on a second more fans to choose from, should give priority to select more efficient, smaller machine number: adjust the scope of a larger one, of course, you should also be compared, cons.

4) if the selected fan impeller diameter than the original fan impeller diameter too much, in order to use the original motor shafts, bearings and bearings, etc., must be on the motor start time, fan the original part of the strength and the axis of the critical speed, etc.

5) select the centrifugal fan, when their use of the motor power is less than or equal to 75KW, you can not only start with the installation of the valve. When the carriage of high temperature flue gas or air and select centrifugal boiler fan, should start with the valve to prevent overloading the cold operation.

6) on a noise control requirements of ventilation system, you should first select the high efficiency, low circle velocity impeller fan, and enable it in the most efficient point; it should also be according to the ventilation system noise and vibration mode of transmission, to take appropriate measures to eliminate noise and vibration. Fan and motor vibration reduction measures can be adopted, in General, such as spring shock absorber or rubber damper, etc.

7) select the fan, you should avoid using parallel or series of fan. When unavoidable, you should select the same model, combined with the performance of the fan. When the in-line, the first level exhaust fan to secondary fan should have a certain pipe connection.

8) have chosen the new fan should consider making full use of existing equipment, are suitable for on-site production installation and safety issues.