The characteristics of centrifugal fans used in construction

Fan - is familiar to many device occurring in the home and in industry.By design features they are axial, centrifugal and diameter.For the first time, such mechanisms have appeared at the beginning of the XVIII century in Britain.They used a steam engine as a drive and were themselves axial.

centrifugal fan was invented later in the Russian military engineer A.Sablukovym.Today they are the most common, especially in an industry where you have to move the gas-air mixture in large volumes.Work on electric motors.

Structure and working principle

centrifugal (or radial) fan for moving air or gas mixture in the ventilation systems of residential, industrial, commercial, public areas to clean, moisture control, ie to create a favorable climate for human life.

In his device, he has the following elements: volute casing, blades, impeller motor.When the engine is turned blades start spinning, sucking air which due to the centrifugal force is held in the volute, and then into the duct, to the outlet, the perpendicular entry, air is already purified.

operation

Terms Centrifugal fans can be used in environments where the following conditions are met:

• temperature (or non-explosive gas mixture) is not greater than 80 ° C, for a bilateral - up to 60 °;
• mechanical impurities must not exceed 1 g / m3;
• air is not contained in the fibrous particles and the adhesive substances.

Failure to comply with these conditions, the excess parameters leads to rapid wear of the fans and their failure.

Species

Based on various criteria, classification of centrifugal fans can be different.

Depending on the direction of air flow:

• exhaust;
• double suction;

Depending on the magnitude of the air pressure:

• to 1000 Pa - Low pressure;
• 1000-3000 Pa - medium pressure;
• 3000-12000 Pa - high pressure;

Depending on the direction of rotation (on the suction side):

• right rotation (the blades rotate clockwise);
• left rotation (the blades rotate counterclockwise).

Labelling - The (fan)

• Name of product: C or P -, respectively, centrifugal or radial;
• value of total pressure ratio (integer);
• designation rapidity - hy;
• identification number of the product in accordance with GOST 10616, in accordance with the size of the outer diameter of the wheel - D.

designations GOST:

Thus, the designation BP-300-45-2,0 corresponds to a radial fan with a total pressure ratio of 300 (averagepressure) specific speed 45, the impeller diameter is equal to 200 mm.

main producers of

fan market today is very rich in both foreign and domestic models.Among them are the following brands:

Soler & amp; Palau (Spain) .Almost 300 models of this brand feature top quality and reliability.The body products made of galvanized steel, some models have a special protective layer.Fans Soler & amp; Palau have a knob to change the engine speed, the insulating layer, extinguishing the sound waves and vibrations, can operate at temperatures from -15 ° to + 400 ° C and even in potentially explosive atmospheres.

Systemair .These compact devices can also be used independently, and plenums.Fans have a steel casing that protects against corrosion mechanism.From overheating to protect the engine thermal contacts.

Ostberg .These fans are designed for installation in ducts of varying complexity and size of the system.The housing and the impeller produces a manufacturer of galvanized steel.Differ durability, long life, adjustable rotational speed, ease of service.The latter is achieved due to the fact that the impeller and the motor is fixed to the opening Doors: To clean the fan, you just need to open the door.

Vortice .Fans of this manufacturer can operate at temperatures up to 40 °, to circulate large volumes of air: 6300 m3 / h.This performance allows their use in semi-industrial and industrial applications.

VEZA .Domestic fans models perfectly adapted to the regional climate - they are made by the individual on the basis of technology besshtampovogo serial production.Features a variety of range (series of lies, WATER, Wravien, CROS, blood and others.), Almost all of the series are available in frost, explosion, earthquake-resistant design.

Prices

cost depends on many factors, chief among them are the following:

• manufacturer;
• dimensions or size;
• performance scheme (explosion-proof, cold-resistant, corrosion resistant, for corrosive media, etc.);
• performance material (steel or stainless steel);
• engine parameters -. Power, size, protection class and other

In each case, the price of the device is individual and has quite a large spread.Depending on the options you need to buy a centrifugal fan from 5.5 to 350 thousand rubles.