VC 4-75 #12.5 w/motor AIR 112 MA6 3 kW 1000 rpm, execution 5

Low-pressure centrifugal fan of the VC 4-75 #12.5 w/motor AIR 112 MA6 3 kW 1000 rpm series for general industrial applications, manufactured according to design scheme No. 5 with a belt drive and made of carbon steel.

This fan is designed for ventilation or air conditioning systems and other gas mixtures, the aggressiveness of which towards carbon steel does not exceed that of air with a temperature up to 80°C. The transported medium must not contain fibrous materials, sticky substances, dust, or other solid impurities in amounts exceeding 100 mg/m³. Operation is allowed in moderate (U) climate (placement category 3) and tropical (T) climate (placement category 2).

The centrifugal fan VC 4-75 #12,5 (VR 88-72.1-5.5, VR 80-75-5) consists of the following units, which can be purchased separately:

• VC 4-75 #12,5 fan without electric motor
• impeller of VC 4-75 #12,5 fan (VR 88-72.1-5.5)
• fan casing (VR 80-75-5)
•  Electric motor AIR 112 MA6

General information about centrifugal fans VC 4-75 #12.5 w/motor AIR 112 MA6 3 kW 1000 rpm (VR 88-72.1-5.5, VR 80-75-5):

• Low-pressure
• Single-sided suction
• Backward-curved blades
• Number of blades: 12
• Rotation direction: right and left
• Design scheme: No. 5 (belt drive) – with use of V-belts, drive and driven pulleys

Purpose of centrifugal fans VC 4-75 #12.5 w/motor AIR 112 MA6 3 kW 1000 rpm (VR 88-72.1-5.5, VR 80-75-5):
Centrifugal fan VC 4-75 #12.5 w/motor AIR 112 MA6 3 kW 1000 rpm is designed for moving air and other gas mixtures, the aggressiveness of which towards carbon steel does not exceed that of air, and which do not contain sticky substances, fibrous materials, or dust and other solid impurities in an amount not exceeding 100 mg/m³.

Application of centrifugal fans VC 4-75 #12.5 w/motor AIR 112 MA6 3 kW 1000 rpm (VR 88-72.1-5.5, VR 80-75-5):

• in air conditioning systems
• in ventilation systems
• in air heating systems
• for other sanitary and industrial purposes

Centrifugal fan VC 4-75 #12.5 w/motor AIR 112 MA6 3 kW 1000 rpm (VR 88-72.1-5.5, VR 80-75-5) is operated under moderate climate conditions, at ambient temperatures from -40°C to +40°C. The temperature of the transported medium should not exceed 80 °C.

Operating principle of centrifugal fan VC 4-75 #12.5 w/motor AIR 112 MA6 3 kW 1000 rpm:
Air, receiving energy from the impeller blades, enters the fan under the influence of centrifugal force at a 90-degree angle and is directed radially into the scroll casing; inside the scroll, it moves in a spiral-shaped housing under pressure and is discharged through the fan outlet.

Completeness of centrifugal fan VC 4-75 #12.5 w/motor AIR 112 MA6 3 kW 1000 rpm (VR 88-72.1-5.5, VR 80-75-5):

• scroll casing,
• impeller,
• base frame,
• collector,
• electric motor.

The impeller consists of a front and rear disc, 12 sheet blades, and a hub. The fan base is welded. The base has a hole for installation on vibration isolators or a foundation. The electric motor and cover are mounted on the base. The conical collector for supplying air to the impeller is attached to the inlet nozzle. The overlap between the collector and the front disc of the impeller is adjusted by axial movement of the collector in the inlet nozzle.

Position of the housing of right (RH) and left (LH) rotation radial fans, view from the suction port: