VC 4-70 VZ #4 w/motor 4VR 90 L4 2.2 kW 1500 rpm, execution 1

Low-pressure centrifugal fan of the VC 4-70 VZ #4 w/motor 4VR 90 L4 2.2 kW 1500 rpm series, manufactured according to design scheme No. 1 from aluminum alloys for explosive environments.

This fan is designed for ventilation or air conditioning systems for explosive gas-air mixtures of the 1st and 2nd categories of groups T1, T2, T3 according to the classification of the "Electrical Installation Code" (EIC), which do not cause accelerated corrosion of the materials of the fan flow part. These mixtures must not exceed a temperature of 80 °C, and the content of fibrous materials, sticky substances, dust, and other solid impurities must not exceed 100 mg/m³ under conditions of moderate (U) climate (placement category 3) and tropical (T) climate (placement category 2). The ambient temperature is allowed in the range from -40°C to +40°C (+40°C when equipped with tropical version electric motors).

Fans of the VC 4-70 VZ (vzryvozaschischennyj) #4 series (VR 88-72.1-5.5, VR 80-75-5) are not applicable for moving gas-air mixtures:
A) containing explosives, additional oxygen, explosive dust;
B) from technological units in which explosive substances are heated above their autoignition temperature or are under excessive pressure.

Fans with enhanced spark protection are used for servicing explosive rooms of classes B-1a and B-1b according to the classification of the "Electrical Installation Code" (EIC) under normal operating conditions.

The centrifugal fan VC 4-70 VZ (vzryvozaschischennyj) #4 (VR 88-72.1-5.5, VR 80-75-5) consists of the following units, which can be purchased separately:

• fan VC 4-70 VZ (vzryvozaschischennyj) #4 (VR 88-72.1-5.5, VR 80-75-5) without electric motor
• impeller of the fan VC 4-70 VZ (vzryvozaschischennyj) #4 (VR 88-72.1-5.5)
• casing (housing) of the fan VC 4-70 VZ (vzryvozaschischennyj) #4 (VR 80-75-5)
• Electric motor 4VR 90 L4

General information about centrifugal fans VC 4-70 VZ (vzryvozaschischennyj) #4 (VR 88-72.1-5.5, VR 80-75-5) with electric motor Electric motor 4VR 90 L4 2.2 Power kW 1500 Vol./Min:

• Low pressure
• Single-sided suction
• Backward-curved blades
• Number of blades: 12
• Direction of rotation - right and left
• Material - aluminum alloys

Purpose of centrifugal fans VC 4-70 VZ (vzryvozaschischennyj) #4 (VR 88-72.1-5.5, VR 80-75-5):

This fan is designed for ventilation or air conditioning systems for explosive gas-air mixtures of the 1st and 2nd categories of groups T1, T2, T3 according to the classification of the "Electrical Installation Code" (EIC), which do not cause accelerated corrosion of the materials of the fan flow part.

Centrifugal fans VC 4-70 VZ (vzryvozaschischennyj) #4 (VR 88-72.1-5.5, VR 80-75-5) are used in:

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

The centrifugal fan VC 4-70 VZ #4 w/motor 4VR 90 L4 2.2 kW 1500 rpm made of aluminum alloys with enhanced spark protection is designed for moving explosive gas-air mixtures. This type of fan is operated under moderate climate conditions at ambient temperatures from -40°C to +40°C. The temperature of the transported medium must not exceed 80 °C.

Operating principle of the centrifugal fan VC 4-70 VZ (vzryvozaschischennyj) #4 (VR 88-72.1-5.5, VR 80-75-5):

Air, receiving energy from the blades of the impeller, enters the fan under the influence of centrifugal force at a 90-degree angle and moves in a radial direction to the volute of the spiral casing. In the volute, moving along the spiral-shaped casing, the air under pressure is directed through the fan outlet.

Completeness of the centrifugal fan VC 4-70 VZ (vzryvozaschischennyj) #4 (VR 88-72.1-5.5, VR 80-75-5):

• spiral casing,
• impeller,
• frame,
• collector,
• Electric motor 4VR 90 L4

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

Position of the casings of radial fans with right (PR) and left (LIV) rotation, view from the suction opening: