Centrifugal Blower Manufacturer in India

A centrifugal blower operates based on the principle of centrifugal force. Air enters the center of the impeller through the inlet eye. As the impeller rotates, the air is thrown radially outward towards the casing by centrifugal force. This kinetic energy is then converted into static pressure as the air slows down while moving through the scroll-shaped volute casing, finally exiting through the discharge outlet.

• The primary components include the impeller (the rotating wheel with blades), the casing or volute (the housing that encloses the impeller), the inlet and outlet nozzles, the shaft and bearings, and the drive mechanism which can be a direct coupling, belt drive, or motor integration.

In a forward curved impeller, the blades curve in the direction of rotation. These are designed for low pressure and high volume applications and are generally quieter. Backward curved impellers, where blades curve against the direction of rotation, are more efficient and suitable for high pressure applications. They are non-overloading, meaning the power demand drops as the flow increases above the design point.

The terms are often used interchangeably in the industry, but technically the difference lies in the pressure ratio. A fan typically moves air against a resistance up to a specific pressure ratio, usually around 1.11. A blower is designed to handle higher pressure ratios, generally exceeding 1.11 but less than the compression ratio of a compressor (which is roughly 1.2 to higher).

To calculate the required CFM, you must determine the total air volume needed for the specific application. The basic formula involves the cross-sectional area of the duct or space multiplied by the velocity of the air. In system design, you calculate the air changes per hour required for the room volume. For example, to change the air in a 10,000 cubic foot room 10 times an hour, you would divide 100,000 by 60 minutes to get roughly 1667 CFM.

A performance curve is a graphical representation of a blower’s operation. It plots static pressure on the Y-axis against volume flow (CFM) on the X-axis. It will also include lines for brake horsepower and static efficiency. When selecting a blower, you plot your system resistance curve to find the intersection point with the blower curve, ensuring it falls within the stable operating region.

These blowers are versatile and used extensively in material handling (pneumatic conveying), dust collection systems, combustion air supply for boilers, ventilation and fume extraction in factories, wastewater treatment aeration, and drying processes.

The main difference is the direction of airflow. In an axial fan, air enters and exits in a straight line parallel to the shaft. In a centrifugal blower, air enters axially and exits radially at a 90-degree angle. Centrifugal blowers are better suited for higher pressures and compact ductwork, while axial fans are better for moving large volumes of air at low pressures.

A multistage centrifugal blower consists of multiple impellers mounted on a single shaft within a single casing. Air passes from one stage to the next, increasing in pressure at each step. These are used when very high discharge pressures are required that a single stage impeller cannot achieve efficiently.

Centrifugal blowers, especially those operating at high speeds or in high-pressure applications, generate significant noise due to air turbulence and mechanical vibration. A silencer, installed on the inlet or outlet, reduces this airborne noise to comply with environmental regulations or to ensure a safe working environment.

Surge is an unstable operating condition that occurs when the system resistance is too high, causing the airflow to momentarily reverse back into the blower. This causes violent pulsations, vibration, and potential damage to the impeller and bearings. It is critical to select a blower that operates to the right of the surge point on the performance curve.

Selecting a blower for a dust collector requires calculating the total static pressure of the system, which includes the pressure drop across the filter media, the ductwork, and the hoods. You must also know the air volume required to capture the dust at the pickup points. The blower must provide enough pressure to overcome the resistance of the dirty filters as well.

For general air handling, carbon steel is common. For corrosive environments or fume extraction, we use stainless steel or FRP (Fiber Reinforced Plastic). For handling chemical fumes or highly corrosive gases, PP FRP (Polypropylene) or PVC blowers are standard. At Envigaurd, we often select materials based on the chemical compatibility chart of the gas being moved.

EC stands for Electronically Commutated. These are DC motors with built-in electronics that run on AC power. They are highly energy efficient, offer variable speed control without needing a separate VFD (Variable Frequency Drive), and are known for their compact size and controllability, often used in HVAC and clean room applications.

In a single inlet (SISW) blower, air enters from one side of the impeller. In a double inlet (DIDW) blower, air enters from both sides simultaneously. Double inlet blowers are used for higher volume airflow applications and help balance the axial thrust load on the bearings, often allowing for a more compact design relative to the air volume moved.

The theoretical power can be calculated using the formula for air power, which is Pressure (in Pascals) multiplied by Flow (in cubic meters per second) divided by the efficiency of the blower. In practice, we select a motor with a safety factor (usually 1.1 to 1.2 times the calculated absorbed power) to account for variations in system resistance and density.

The volute casing is designed with a spiral cross-section that gradually increases in area towards the discharge outlet. This design slows down the high-velocity air coming off the impeller tips, converting dynamic kinetic energy into static pressure with minimal losses.

Yes, but it requires specific design modifications. For high temperature applications, such as boiler exhaust, the blower must be equipped with a water-cooled shaft bearing housing, heat shields, and expanded shaft clearance to account for thermal expansion. The material selection must also withstand the operating temperature.

Routine maintenance includes checking bearing vibration and temperature, lubricating bearings if they are not sealed-for-life, inspecting the impeller for wear or corrosion, tightening belt drives (if applicable), and ensuring the inlet and outlet flanges are free from leaks. Periodic cleaning of the impeller prevents imbalance.

The HSN (Harmonized System of Nomenclature) code is used for classifying goods for taxation. In India, for example, centrifugal blowers generally fall under heading 8414 (Air or vacuum pumps, air or other gas compressors and fans). Identifying the correct code is essential for customs clearance and GST documentation.

Direct drive blowers are more compact, have fewer moving parts, and require less maintenance since there are no belts. They run at the motor speed. Belt drive blowers allow you to change the RPM by changing the sheave ratio, enabling you to tune the blower performance exactly to the system requirements without changing the motor.

The impeller is the heart of the blower. Its geometry, including the number of blades, blade angle, and diameter, dictates the pressure and volume characteristics. A well-designed impeller ensures smooth airflow with minimal turbulence, which maximizes efficiency and reduces noise.

Yes, these are usually high pressure blowers, often multistage or equipped with high-speed backward curved impellers. They are designed to overcome the high pressure drop caused by moving solid materials through pipes. The design focuses on robustness to prevent particle ingress into the bearings.

Static efficiency is the ratio of the static output power (static pressure times flow rate) to the input power absorbed by the impeller shaft. It is a critical metric for evaluating how effectively the blower converts electrical energy into useful air pressure, ignoring the velocity component of the air.

The altitude and ambient temperature of the installation site affect the air density. At higher altitudes or higher temperatures, air is less dense. Since a centrifugal blower is a constant volume machine (it moves the same volume of air), a lower air density means it will move less mass of air and generate less pressure. Design calculations must correct for these site conditions.