Ring Compressor from Fuji
The Fuji Ring Compressor is a non-positive displacement, high volume, low pressure blower that can operate as either a compressor or a vacuum pump. It is also known by other names such as: regenerative blower, vortex blower, and side-channel blower. All of the names describe the basic principle of operation of the blower.
The blower consists of an impeller mounted directly on a motor shaft and is rotated at a high speed, about 3600 RPM. On the periphery of the impeller is a large number of radial blades. The impeller is positioned between two end-plates with the blades located with a channel on either side (hence, the name side-channel). As the impeller spins and the blades pass the inlet port, a low pressure area is created that draws in air, or other gases. The impeller blades impart motion to the air by centrifugal force, throwing it outward and forward, where it follows the contour of the side-channel and is returned to the base, or root, of the impeller. This action is repeated many times, creating a vortex. Each regeneration causes the air to gain pressure until it reaches the portion of the housing where the air is stripped from the impeller and discharged from the blower.
The ring compressor is, in effect, a multi-stage compressor
with each regeneration of the air becoming another stage.
The pressure increase at each stage in the cycle is very small,
but the large number of stages yields inlet vacuum levels
of up to 8 in. Hg and discharge pressures of up to 5 PSIG,
depending on the size of the blower.
The basic construction of a ring compressor means that the
only moving part is the impeller. Nothing touches except the
bearings. The method of compression means that there is no
requirement for lubrication in the compression chamber; the
discharge air is oil-less. No oil aerosols are present in
the discharge air; nor carbon dust generated by sliding vanes.
The blowers may be mounted vertically (with impeller housing
down) or horizontally.
|-- Features -- Construction -- Fuji Catalogue|
|Suction and discharge silencers||Reduces noise levels to below OSHA standards. Makes it more comfortable for employees working near the blowers.|
|Die cast impeller||Promotes smoother air flow and higher volumetric efficiency.|
|Dynamically balanced impeller||Smoother operation. Allows vibration-free installation in OEM equipment.|
|Double shielded shaft bearing||Better grease retention. Increased reliability.|
|Dust-proof shaft seal||Protects bearings from contaminants for longer life.|
|Motor shaft-mounted impeller||Eliminates the need for couplings, belts or gears. Nothing to break or wear out.|
|50/60 Hz. motors, wide voltage range||Minimizes OEM inventory requirements.|
|Improved cooling fan design||Cools the motor and blower. Quieter running and more efficient.|
|Built-in Thermal protector||Protects the motor from overheating for greater reliability.|
|Compact design||Space saving design makes it easier for OEM's to incorporate the blower into their equipment.|
|Removable thread flanges||Easy replacement in OEM equipment.|
| Fuji Regenerative
Blower -- Cross-Sectional Diagram
Fuji's complete line of ring compressors is designed to meet the most critical application requirements. Each features an impeller, mounting base and housing manufactured of aluminium alloy for maximum strength, reduced weight and increased corrosion resistance. The compressor and motor are constructed as a unit for mechanical simplicity and maximum structural integrity. The elimination of clutches, gears, belts and sliding vanes reduces periodic maintenance requirements while increasing reliability.
TEFC (totally enclosed, fan-cooled) motors are standard on all models, except VFC063P and VFC100 models, which are TENV (totally enclosed, non-ventilated). In addition, all models have NEMA class B, or class F (model VFC704), insulation, and are Underwriters Recognized (Yellow Card File E54355), and CSA Certified (File LR48762) and CE compliant. All single-phase units have built-in automatic reset thermal protectors, except models VFC400P and VFC504P. All three-phase units have pilot duty thermal protectors requiring only the addition of an external contactor for overload protection, however, magnetic motor starters are recommended.
All ring compressor impellers are dynamically balanced to virtually eliminate vibration while increasing overall long-term reliability. Most models have a shaft oil-seal between the impeller and bearing, as well as a double shielded bearing to reduce the possibility of foreign material influx and preclude air contamination.