Regenerative blowers operate as a multistaged compressors. Each blade-to-blade regeneration
stage results in a slight pressure increase. Total pressure rise from air entry
to discharge yields a continuous operating pressure up to 300-in. w.g. (11 PSIg)
or a vacuum to 14-in. Hg with continuous flows to more than 1400 scfm (Fig.
3).
Side Channel blowers are ideal for moving large volumes of air at low pressures or vacuums. Unlike positive displacement compressors and vacuum
pumps Shaquem Griffin Seahawks Jersey , they pressurize air through a nonpositive displacement method. Typical regenerative blower applications include sewage
aeration, vacuum lifting, vacuum packaging, pneumatic conveying Rashaad Penny Seahawks Jersey , concrete aeration, pond aeration, vacuum tables, drying Kam Chancellor Seahawks Jersey , dustsmoke removal, air sparging, and chip removal.
Of all air handling equipment, regenerative blowers are probably the least understood. However Doug Baldwin Seahawks Jersey , when system parameters fall within their range, they can be among the most cost-effective methods for moving air and
producing pressure or vacuum.
Regenerative blowers are sometimes called side channel blowers or ring compressors, terms that refer to their physical
construction. They can be direct or belt driven. In direct drives, the impeller
is mounted on an electric motor shaft. The number Earl Thomas III Seahawks Jersey , size, and angle of the blades on the impeller determine pneumatic performance as well as the relationship between the
impeller and housing. Some blowers have rather flat performance curves while
others have steep ones.
The impeller spins within a housing with an inboard and outboard channel. It is from this configuration that the name side
channel blower is drawn. As the impeller blades pass the inlet port, they draw
air in. The impeller rotation pushes air outward and forward into the channels.
The air then returns to the base of the blade. As the impeller spins, the
process repeats. This regeneration gives the blower its pressurevacuum
capabilities.
Most blowers are single stage: air travels around the blower housing once and is discharged. Two-stage regenerative blowers can
provide almost twice the pressure or vacuum of single-stage units. In a
single-impeller Byron Maxwell Jersey , two-stage unit, air makes one revolution around the front side of the impeller. Then, instead of being discharged, the air is
channeled to the backside of the impeller through internal porting. Air then
makes another revolution around the backside of the impeller before it is
discharged. Other two-stage configurations are also available Sebastian Janikowski Jersey , including designs that use two separate impellers in one housing or two impellers and housings.
Among the major benefits of a regenerative blower is its lack of maintenance and monitoring
requirements. The impeller is the only moving part and is wear free and does not
come in contact with the housing channels. Self-lubricated bearings are the only
parts that wear.
The majority of blower failures are caused by improper installation or operation. Regenerative blowers have close internal clearances
between the impeller and housing. It is important to prevent foreign material
from entering that space. Ingested debris wedging between the impeller and
housing can cause the blower to lock up and lead to a catastrophic failure. A
blower should always be equipped with an intake filter. A 10-micron size is
usually adequate. Filters must be kept clean. A blocked filter will starve
flow.
Overpressurization can also cause deadheading (zero airflow through the blower) and catastrophic failure. Some blowers tolerate deadheading, but
other models (typically those above 1 hp) must have air passing through them for
cooling. If air does not pass through the blower, heat builds up in the impeller
causing it to expand at a faster rate than the housing. Eventually the impeller
locks up with the housing and the blower fails. A relief valve prevents
overpressurization and deadheading conditions and allows air to pass through the
blower.
Additional information can be found at the Industrial Pressure Blower Company web site http:www.industrialpressureblowerindex.
Oleg Tchetchel
Industrial Process Air Specialist
Industrial Pressure Blower Co.
http:www.industrialpressureblowerinquiry
http:www.industrialpressureblowerfan Learning More On Wooden Windows Learning More On Wooden Windows November 6, 2013
| Author: Jodie Morris Blenheim | Posted in Business
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