Working Of Ring Blower

In the world of air handling equipment, RING BLOWERS are probably least understood of today’s technology, but when system parameters fall within the range of RING BLOWER , it can be most cost effective method of producing pressure or vacuum. Popularly known as RING BLOWER, is also known as REGENERATIVE BLOWER, SIDE CHANNEL BLOWER, TURBINE BLOWER, RING COMPRESSOR, VACUUM BLOWER, VORTEX BLOWERS,HIGH PRESSURE BLOWER,HIGH VACUUM BLOWER,LATERAL CHANNEL BLOWER etc.

Maximum capacities being manufactured provide 2050 M3/Hr of flow and maximum vacuum of 730 mbar and maximum pressures of 1040 mbar. Below given diagram and explanation will serve as guide to working principle of RING BLOWER.

As can be seen in the diagram, the ring shaped working chamber

• has a circular cross section
• One half of this cross section is formed by the impeller
• with it’s radial blades
• on one side, while the other fixed half is formed by the housing
• The working chamber has an inlet port
• and an outlet port
• with the impeller shown in the diagram rotating in a counter-clockwise direction. Between the inlet and outlet ports is the rotor

• filling up the side channel. Air is trapped between the impeller pockets of the rotating impeller and is then accelerated centrifugally. The air stream is ducted by centrifugal force into the side channel blower. It is then taken up by the impeller pockets and the air is re-directed back into the following pocket, where the process is repeated. The air is accelerated and compressed in the impeller with each cycle. The more the blower is throttled, either at the inlet or discharge, the greater the number of impeller re-entries and hence in-creased compression. One can compare the movement of an air molecules in the blower with a spring, the pitch of which becomes tighter the more the air is throttled. When you measure the pressure at different points on the ring channel, you find that it rises constantly from inlet (6) to outlet (7). The side channel principle works as a vacuum pump when throttled on the suction side, and as a compressor when throttled on the pressure side. Maximum capacities being manufactured provide 2050 M3/Hr of flow and maximum vacuum of 730 mbar and maximum pressures of 1040 mbar. Below given diagram and explanation will serve as guide to working principle of RING BLOWER.

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 aluminium 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.

Blower in Place of Vacuum Pump

The robustness and the reliability of our Blowers are very much appreciated for this application. Particularly for the vacuum application of pneumatic conveying in vacuum because Ring Blower used to create a vacuum are less sensitive to the possible passage of conveyed particles., than other technologies.

Blower for Pneumatic Conveying Systems

When bulk goods need to be conveyed gently from A to B, segregation-free and without break-up, a variety of pneumatic conveying systems can be used, dependent on the application, such as suction conveying systems, pressure conveying systems, suction-pressure conveying systems, impulse conveying systems or dense-phase conveying systems.

Pneumatic conveying (the transfer of dry bulk products such as flour and plastic pellets through a pipe line) has been one of the major uses for Ring blowers and one in which RAICO has developed much engineering expertise.

Blower For Food Processing

Fresh produce needs to be cleaned before it can be placed in market. Blowers provide very economical & efficient cleaning of fresh produce by agitating water bath in which produce can be placed for cleaning. Powerful agitation of water is gentle to the produce, so no harm comes to its texture.

Blower For Personal Cleaning

Blowers provide very effective, safe, efficient and economical solution for personal cleaning.

Blowers For Dust Protection

Blowers are used for dust protection & cooling of opacity sensors, video camera lens etc.

Blower For Efficient Furnace Fuel Burning

These blowers deliver higher pressure compared to centrifugal blower, making it possible to improve fuel to air mixing, leading to very effective fuel burning.
Integration with VFD makes furnace temperature control very easy.

High pressure blowers with inlet air temperature below 70deg. C. and direct mounting are compact in construction and run with high-speed motors.  Such blowers are mostly used for better mixing of fresh air to the furnace for a better combustion.

Blower For Drying / Debris Removal With Air Knife

These blowers are ideal for use along with Air Knifes for drying & debris removal in bottling, ink jet coding, packaging, labeling, sleeving and similar applications. They deliver results at much lesser capital & operating costs. Lower rotational speed of impeller, reduces noise level & offers maintenance free long & continuous life