Fan selection is a very technical work, and there are many specific selection methods, such as: selection by dimensionless characteristic curve, selection by logarithmic coordinate curve, selection by characteristic curve or performance table, Variant selection, selection of pipe network resistance, etc., currently through the Web online selection system and the use of specialized selection software to select. The methods are complicated and some methods require a certain amount of expertise.
For the general business personnel, familiar with and master the two methods of the performance table selection and the fan selection software. These two methods are simple and easy to operate. When selecting a fan, firstly, according to the two basic parameters of the required air volume and total pressure of the fan, the model and the machine number of the fan can be determined through the dimension performance table of the fan (the relevant product specifications of each fan). At the same time, more than one product may meet the requirements; then, in combination with the fan application, process requirements, use occasions, etc., select the type, model and structural material of the fan to meet the required working conditions, and strive to make the rated flow and rated pressure of the fan. As close as possible to the flow and pressure required by the process, so that the operating point of the fan is close to the high efficiency zone of the fan characteristic. The specific principles are as follows:
1. Before selecting a ventilator, you should understand the production and product quality of domestic ventilators, such as the variety and specifications of the ventilators produced, the special uses of various products, the development and promotion of new products, etc. The requirements are to choose the preferred fan.
2. According to the physical and chemical properties of the gas delivered by the fan, choose a fan for different purposes. Such as the selection of explosion-proof ventilators with explosive and flammable gas; dust or pulverized coal ventilator should be selected for dust discharge or pulverized coal; anti-corrosion ventilator should be selected for transporting corrosive gas; work at high temperature or High-temperature fans should be selected for the delivery of high-temperature gases.
3. When more than two types of ventilators are available for selection on the ventilator selection performance chart, priority should be given to the higher efficiency and smaller machine number: one with a larger adjustment range. Of course, it should be compared and weighed. The pros and cons are decided.
4. If the diameter of the selected fan impeller is much larger than the diameter of the original fan, in order to utilize the original motor shaft, bearings and bearings, the starting time of the motor, the strength of the original components of the fan and the criticality of the shaft must be The speed is calculated.
5. When the centrifugal fan is selected, when the power of the motor is less than or equal to 75KW, the valve for starting only may not be installed. When the centrifugal boiler induced draft fan is selected for discharging high temperature flue gas or air, a starting valve should be provided to prevent overload during cold operation.
6. For ventilation systems with noise reduction requirements, the ventilator with high efficiency and low impeller circumferential speed should be selected first, and it should work at the highest efficiency point; it should also be based on the noise and vibration propagation mode generated by the ventilation system. Sound and vibration reduction measures. For vibration reduction measures of fans and motors, vibration damping foundations such as spring dampers or rubber dampers are generally used.
7. When selecting a ventilator, it should be avoided to use parallel or series operation of the ventilator. When it is unavoidable, you should choose a fan of the same model and performance. When connecting in series, there should be a certain pipe connection between the first stage fan and the second stage fan.
8. The selected new fan should consider the full use of the original equipment, suitable for on-site production and installation and safe operation.
Concerned about surprises
Label: How to choose the right fan
Previous: Basic information and classification of sandpaper Next: How magnetic pump works
Semi-friable aluminum oxide is a kind of high-grade corundum synthesized by some advantages of brown corundum and white corundum. Its friability is between white corundum and brown corundum. Its grinding performance is unique, and its application range is wide. Semi-friable aluminum oxide has good toughness and self-sharpening. It can be used in the manufacture of ceramic grinding tools, resin grinding tools and coated abrasives. The bonded abrasive tools with semi-friable aluminum oxide have high durability, good self sharpening and retention. Under the same conditions, the surface quality, the processing efficiency and the durability of the grinding tools which produced from semi-friable corundum are better than those of brown, white, chromium and single crystal corundum when processing some workpieces. For rough grinding, the machining efficiency can be improved, and the surface quality of the workpiece can be improved by fine grinding.
Semi-Friable Aluminum Oxide Abrasive Cloth
Semi-Friable Aluminum Oxide Abrasive Cloth,Middle Soft Emery Cloth,Sand Cloth For Narrow Belt,Semi-Friable Aluminum Oxide Emery Cloth
Jiangsu Fengmang Compound Material Science & Tech Group CO.,LTD ,