VC 4-76 Zh Heat-Resistant Carbon Steel Fans
Centrifugal industrial fans of the VC 4-76 series are designed for moving air and other gas flows that are chemically non-aggressive towards carbon steel, with temperatures not exceeding 80 C. The concentration of dust and other solid impurities in the working gas mixture must not exceed 100 mg/m3. The presence of sticky inclusions and fibrous materials is not allowed. The main structural component of these fans is a cylinder with blades. The operating principle of fans in this series is based on the use of centrifugal force, which ejects air. These devices are classified as low-pressure centrifugal fans with single-sided suction.
VC 4-76Zh centrifugal fans are a variety of the VC 4-76 series, designed for moving both air and gas mixtures, but with temperatures not exceeding 200 C. Devices in the VC 4-76Zh line are widely demanded in industrial building air heating systems, air conditioning, ventilation, in technological grain drying lines for moving the heat carrier (drying agent), and for other sanitary and industrial tasks.
Explanation of the Line Marking
Example – “VC4-76Zh No10 Zh”, where:
- “V” – fan;
- “C” – centrifugal;
- “4” – full pressure indicator at maximum full efficiency mode;
- “76” – high-speed index at maximum full efficiency mode;
- “No10” – fan number, corresponding to the diameter of the impeller;
- “Zh” – heat resistance.
General Design Features of VC 4-76Zh Series Fans
- single-sided suction;
- low pressure;
- twelve backward-curved profiled blades;
- belt drive design – scheme No. 5;
- rotating spiral casing/shroud;
- right or left rotation of the impeller.
The ventilating device can be made for both right-hand rotation (the impeller rotates clockwise when viewed from the suction nozzle) and left-hand rotation (the impeller rotates counterclockwise). VC 4-76 Zh centrifugal fans are made of carbon steel.
A standard VC 4-76Zh fan consists of the following units:
- casing, inlet, and outlet nozzles;
- frame – base for mounting units;
- collector;
- impeller (front/rear discs, blades, hub);
- electric motor;
- protective guard.
The welded base has holes for installation on a foundation. The casing and electric motor are attached to it. The inlet nozzle is firmly fitted with a cone-shaped collector to direct the airflow to the impeller. The protective guard prevents personnel from accessing rotating parts, ensuring safe operation of the equipment.
Operating Principle of VC 4-76Zh Series Fans
According to the fifth design scheme of centrifugal fans, the airflow enters the inlet nozzle axially and is expelled through the outlet in a radial direction, moving in the spiral casing under the action of accumulating centrifugal forces.
Operating Conditions
The fans are designed to operate in a moderate climate “U” with placement category 3, as well as in a tropical climate “T” with placement category 2 according to GOST 15150-69, at ambient temperatures ranging from minus 40 C to plus 40 C (for tropical performance, the upper limit is extended to 45 C). It is permissible to use these fans in climate “U” with placement category 1 provided guaranteed protection of the ventilator’s motor from atmospheric exposure. They can also be operated in seismically hazardous regions. Parallel operation of multiple fans without network elements is not recommended. When operating for suction, a diffuser should be installed at the inlet.
The Ventilator online store offers VC 4-76Zh heat-resistant centrifugal fans of the following numbers: 10; 12.5, design scheme No. 5 with belt drive (corresponding impeller diameters – 1000 mm; 1250 mm). These fans are equipped with AIR series electric motors with a power of 30, 45, 55, 15 kW and a rotational speed of 1000, 1500 revolutions per minute. If necessary, it is possible to supply heat-resistant fans of other sizes. To ensure that the acquired VC 4-76Zh heat-resistant centrifugal fans efficiently accomplish their intended purpose, please consult with the specialists at the Ventilator online store before purchasing. Professionals will help you select the necessary centrifugal heat-resistant fan for your enterprise’s technologies at affordable prices and will arrange for the prompt delivery of the purchased equipment.