Draft machines of the type Д and ВД

General information

• High-pressure
• One-side suction
• Direction of rotation – right-hand and left-hand
• Quantity of blades – 32 pc

One way suction mechanisms ВДare intended for supply of air into the combustionchambers of steam boilers. These suction and supply mechanisms are used at boilers with balanced drought, having productivity of 1…25 t/hr, as well as gas & mazutwater boilers with heat productivity 0,5…16 GCal/hr. It is admitted to apply the fans in production units of different industries for supply of a clean air aswell as the smoke exhaust fans on the gas & mazut boilers with balanced suction.

ВД type fans are intended for usage at the ambient temperature minimum -30 °C and maximum 40 °C; permissible temperature of the conveyed medium at the fan entry 200 °C. Exhaust fans ВДand D are designed for long term operation period (outdoors under a tent) in mild climate (climatic version Y, placement category 2, GOST 15150-69). Permissible ambient temperature is not lower than -30 ° C and not above 40 ° C.

Centrifugal exhaust fans of single-suction type D are designed for smoke gas exhaust from the boiler combustion chamber, equipped with efficient system of ash filtration, as well as for the smoke gas exhaust from combustion chambers of gas & mazut boilers. Smoke exhaust fans are designed for long term operation indoors and outdoors in mild climate(climatic version Y, allocation category 1, 2, 3 and 4, 15150-69). It is allowed to start smoke exhaust fanif the temperature inside the housing is not lowerthan -30° C. Maximum temperature of inlet gas to the exhaust fans shall not exceed 200 ° C. For ensuring the durability the smoke exhaust fan housing wall thickness was increased comparing to the fans of ВДtype.

Advantagesof the draft machines Дand ВД «Medved concern»:
Axial guide mechanism of a blowing fan features the improved design: rotation ring rollers are installed on the roller bearings, what ensures the smooth turning of a guide mechanism blades. The guide mechanism is equipped with a dismountable handle, which ensures the convenient connection of single-turn actuators. The application of Teflon bushes and cast iron cowl on the axial guidemechanism ensures the minimum gaps of turning pins. It reduces blowing fan operating vibration and noise level appropriately.

Blowing fans by scheme 3 and 5 have dismountable bearing unit, which improve maintenance ability: it enables bearing change in the housing without removing of working wheel. In blowing fans by scheme 3 and 5 from the working wheel side the big size bearing is installed, which improves the fans reliability. In fans by scheme 3 and 5 with № 9 it is possible to install the cooling piping circuit, is necessary.