Positive Displacement Bi-Lobe Blowers HR71, HR72, HR73
Blower Range: 6556-37324 (M3/HR)
HR Blowers are one of the world’s leading air blower manufacturers and have a reputation for quality, innovation, and service.
The HR (HR80) range of bi-lobe Roots-type positive displacement blowers is manufactured in seven frame sizes with capacity ranging from 127 to 37,200 m3/hr and pressures from 0 to 1000 mBarG.
Design Features
The conservative load-carrying capacity of the larger diameter rolling element bearings ensures extended operating life.
Timing gear life is also extended by controlled lubrication systems.
The computer-calculated impeller profiles ensure maximum volumetric efficiency with minimum absorbed power without sacrificing torsional rigidity.
The high rigidity of the impeller/shafts permits a higher pressure rise to be obtained than with other machines of comparable size.
The generous shaft diameter keeps drive stresses low. Gear and shaft strength are substantially increased by the use of taper-mounted gears that do not need keyways for location.
The setting of the gear wheels to obtain the correct timing of the impellers is simplified, a feature that facilitates field maintenance.
Precision ground and hardened steel gears are used to ensure smooth, silent running and accurate timing of the rotating impellers.
A controlled lubrication system is provided to ensure efficient operation without waste of energy in the gearcase.
Specially designed rotary oil seals are used in the gearcase. This feature eliminates maintenance associated with the use of lip seals.
Design and manufacture are in accordance with metric standards.
The HR range is aimed predominantly at industrial, agricultural, transport, and water treatment applications such as aeration, agitation, pneumatic conveying, fluidization, and blending processes.
The HR range of bi-lobe positive displacement Roots-type blowers is Globally renowned for high performance, efficiency, reliability, and long product life cycle.
The HR (HR80) range can be offered with a range of specialized coatings on wetted parts to suit your application for example Armaloy or Nickel.
Specification
CASING: The cylinder and head plates are manufactured from cast iron. The gearcase is manufactured from aluminum.
IMPELLERS AND SHAFTS: The impellers are made from SG iron, and cast with integral shafts. The shaft diameter of machines in the HR Blowers range is larger than that of earlier designs, enabling increased operating pressures to be achieved without increasing blower size.
GEARS: The precision ground and hardened steel spur gears are tapers mounted onto the impeller shafts. The timing of the impellers relative to each other is accurately maintained at all times.
BEARINGS: The bearings are of generous proportions to give long operational life. Grease lubricated double-row ball bearings are used at the drive end of the blower. In addition to their normal duty of carrying radial loads associated with the differential air pressure on the rotating impellers, the ball bearings provide the axial location of the impellers. Parallel roller bearings at the rear end splash lubrication by oil from the gears.
LUBRICATION: An advanced design of controlled gear wheel lubrication enables the gears to operate at a high pitch line velocity without the need for an oil pump. Simple, maintenance-free oil throwers fitted behind each bearing in the gearcase prevent leakage of oil.
DIRECTION OF ROTATION: Detachable mounting feet enable the blower to be positioned for either vertical or horizontal airflow. Standard machines have a right-hand drive shaft for vertical airflow and a bottom drive shaft for horizontal airflow. If machines are required with a left-hand or top drive shaft, all that needs to be done is turn the gearcase and trough through 180º. Centre timing permits clockwise or anticlockwise drive shaft rotation.
