Technical Information
Working Of Ring Blowers
General construction of RING BLOWER is with direct motor driven balanced radial impeller, housed in close tolerance housing, supported by bearing and sealed with seal. Mostly pressure diecasted aluminum alloy impeller and housings are popular as they provide rugged yet light equipment. Inlet and outlet ports are mostly threaded and provided with silencer. Multiple stage units, come with multiple impellers, housed in multiple housings. Normal speed of impeller is approx. 2900RPM. For the engineer, one of the biggest benefits of a RING BLOWER is, by virtue of its fundamental design, its lack of maintenance/monitoring requirements. The impeller is the only moving part, it does not come in contact with the housing channels and is, therefore “wear-free” Self-lubricated bearings are the only wearing parts. RING BLOWERS are oil-less and have no complicated intake/exhaust valving. Furthermore, most blower makes can be mounted in any plane and with dynamically balanced impellers generate little vibration. As a “non-positive displacement” compressor/vacuum pump, discharge air, besides being clean, is pulsation-free, an important consideration, particularly for plant controls or instrumentation use.
The majority of blower failures are due to improper installation and /or operation. Because there are so few moving parts, there is not much that can go wrong. RING BLOWER has close internal tolerances between the impeller and housing, and it is important to not allow foreign material to enter the blower. Debris that is ingested by a blower can cause a catastrophic failure as it may become wedged between the impeller and housing which will cause the blower to lockup. A filter should always be purchased with a blower to prevent debris from entering the blower. A 10 micron filter is usually adequate to prevent such a failure from happening. Over pressurization can also cause a catastrophic failure. Some blowers can be “dead headed” (zero airflow through the blower) while other models (usually ¾ HP models and above) must have air passing through the blower to cool it. If air does not pass through the blower, heat will build up causing the impeller to expand at a faster rate than the blower housing. Eventually the impeller will lock up with the housing causing blower to fail. A relief valve, vacuum or pressure, will prevent overload and will allow air to pass through the blower.
Suction/Discharge Filters check valves, vacuum-pressure crossover valve, motor starters, and vibramounts are some other accessories.
