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Rotron Multistage Blowers

Rotron M and L Multistage Blowers are unusually compact and light in comparison to conventional multistage turbines. These blowers operate quietly and efficiently and contain no sliding or reciprocating parts. They can be provided as motor or belt driven blowers.

Multistage Blowers have uniquely large pressure-to-volume rations and thus are ideal for applications requiring relatively small volumes of air to be moved against large pressure heads. Typical applications include cooling of U.H.F. radio transmitter tube seals and microwave cavities, sampling of air for nuclear radiation and use in artificial lungs and in computer tape slack control. These blowers can be used for suction, for pressure and in closed air circuit systems.

Multistage Blowers come in a variety of voltages and frequencies and are available with a variety of inlet and outlet configurations. Most units are available with an optional internal Fan Performance Sensor (FPS) or external Low Speed Warning Device (LSWD).

Unusually compact and light in comparison to conventional multistage turbines, these blowers operate quietly and efficiently and contain no sliding or reciprocating parts. They can be provided as motor or belt driven blowers.

 


Applications

These multistage blowers have uniquely large pressure-to-volume ratios and thus are ideal for applications requiring relatively small volumes of air to be moved against large pressure heads. Typical applications include cooling of UHF, radio transmitter tube seals, and microwave cavities, sampling of air for nuclear radiation, and use in artificial lungs and in computer-tape slack control. Basically, these blowers can be used for suction, for pressure, and in closed air circuit systems.

 

Materials and Finishes

Blower and impellers are anodized aluminum and cadmium-plated steel. Housing material is steel, primed with zinc chromate, per MIL-P-8585, and finished with black enamel, per MIL-E-5557, Type IV. There is a chemical conversion coating per MIL-C-5541 plus one coat of lusterless black enamel, color *37038 per Federal Standard 595, conforming to TT-E-489, Type B. Motor frame and end bells are aluminum and are primed and finished according to the specifications listed above. The shaft and hardware are stainless steel.

The cascaded blower stages are mounted on a single, hollow stainless steel shaft and are directly driven by a 1-phase or 3-phase induction motor which is wound with Class F insulation, standard; with Class H optional. The shaft runs on two ball bearings, of special double-width construction, which are double-shielded and greased for life.

 

Performance Sensors

All models equipped with optional performance sensors send out a tachometer-type signal generated from a Hall sensor activated by a small permanent magnet mounted on the rotor of the blower motor. The signal depends on the blower type:

 

Fan Type

Signal

AC

10% on – 90% off sq. wave pulse

E.C.D.C.

50% on – 50% off sq. wave pulse

 

Low Speed Warning Detector (LSWD)
The Low Speed Warning Detector (LSWD) utilizes a programmable frequency switch capable of turning “on” and “off” a load such as a LED, audible alarm, back-up fan, etc., at a predetermined motor RPM. If fan speed falls below the preset value, the back-up or warning device is activated. Once fan speed exceeds the preset value, it is de-activated. The RPM value is preset at the factory between 2,000 and 20,000 RPM (actual value is determined by the specific fan performance and customer requirements) with approximately ±10% RPM hysteresis.


AMETEK Rotron - Multistage Blowers - Model L