Centrifugal blowers can pull vacuum and produce positive pressure. Thus, economically generating dry, clean air at low pressure resulting in increased production. To create this velocity with a continuous flow of air or gas, each blower has a set of internal wheels or impellers. Air or gas is absorbed into the inlet and transferred to the wheel and emitted through the discharge at 90 degrees.
Impellers are individually balanced and assembled onto the shaft, then balanced as a complete assembly. These components are manufactured in fabricated or cast aluminum but coatings are available for corrosive gases. Impellers also have incremental vane angles and vary in numbers.
The number of stages furnished with our blowers depends on application requirements. Each blower can be manufactured anywhere from one to 10 stages and each stage has an impeller. A blower with one1 stage, as in one impeller, is specific for low-pressure applications.
Whereas 10 stages, as in 10 impellers, are specific for high-pressure applications. The amount of resistance for the flow of gas or air determines the required pressure. Higher resistance results in a greater number of stages.
Numerous components like baffle rings, balance positions, multistage shrouded impellers, flexible couplings, cast housings, labyrinth seals, carbon ring seals or MAX Seal (mechanical axial), makeup our blowers.
1. Multiple Baffle Rings -Guide airflow smoothly into the eye of the impeller, dramatically reducing inlet passage losses. When combined with the two-dimensional impeller design increases blower efficiency and pressure/vacuum capability.
2. Balance Piston - Located at the outlet end of the rotating impeller assembly to compensate for the axial force of the impellers on the inlet bearing. This greatly increases bearing life for longer, trouble-free operation.
3. Multistage Shrouded Impellers - Two-dimensional shrouded cast aluminum impellers are balanced individually and keyed onto the shaft. On most blowers, the complete assembly is then balanced to achieve smooth operation with the lowest vibration levels in the industry. Rotor assemblies are designed to operate well below the first critical speeds for added reliability.
4. Flexible Coupling - Blowers and exhausters connect directly to the power source with a precision aligned flexible coupling. This optimizes power transfer and minimizes bearing loads for longer life.
5. Cast Housing - Blower housings are precision machined from high-grade cast iron. Smaller models are cast aluminum. The intermediate blower sections are assembled using high strength steel rods. The blower and its driver are mounted together on a single steel baseplate. This assures long-lasting performance and durability.
6. Labyrinth Seal - Minimizes leakage of gas throughout stages and stops airflow from reversing. Non-contact, non-wearing labyrinth air seals are standard. This no-maintenance seal is used in most air and some gas applications (purge option available).
7. Carbon Ring Seal/MAXSeal (Mechanical Axial) - For special air and gas applications requiring superior sealing, carbon ring seals are available with purge option.
An innovation in dry seal technology that reduces fugitive emissions by up to 67% when compared to traditional seal options. Ideal for landfill gas and applications handling toxic and explosive gases. Improves the safety of your operation while extending bearing life and lowering the total cost of ownership.
Blowers & exhausters circulate air or gas; however, they differ in their process of circulation. Exhausters are the heart of vacuum systems; whereas, blowers channel air or gas in a specific direction.
A blower is a low pressure, high volume compressor. Blowers are applied to systems that require the machine to provide positive pressure. These units take ambient air or gas from supply and compress the air or gas to produce the required result.
Exhausters are designed to provide continuous flow and pulse-free air while delivering a quiet and clean vacuum. These units are practically maintenance-free with only one moving part and no timing gears. Bearings require only occasional greasing and the shaft seals are non-contacting and non-wearing.
Durable, reliable and efficient, HOFFMAN & LAMSON centrifugal blowers & exhausters represent the highest quality workmanship in the industry. Our dedication to design and quality assures you that the HOFFMAN & LAMSON blower you select is best in the industry and suitable for your specific process requirements.