Holmes Roots Type Blowers

HR 10 to HR 73 Positive Displacement Bi-Lobe Blowers, Built to last ( 127 to 37,324 M3/HR)

Our reputation as a World leading manufacturer of air blowers and Roots type blowers stems from year upon year of consistent, quality service across a range of products.

Need help sizing your blower? The HR Blower engineering team are here to assist. Contact us today.

The HR (HR80) range of bi-lobe Roots type positive displacement blowers are manufactured in seven frame sizes with capacity ranging from 127 to 37,324 m3/hr and pressures from 0 to 1000 mBarG.

The HR range is aimed predominantly at industrial, agricultural, transport and water treatment applications such as aeration, agitation, pneumatic conveying, fluidisation and blending processes.

The HR range of bi-lobe positive displacement Roots type blowers are 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.

HR 80 Roots Type Blower by HR Blowers Huddersfield

For more information or to discuss prices and delivery, please contact us.

Sizes and capacities Applications Design Features Specification

Sizes and capacities

Model no.	Volume flow m³/hr	Max pressure mBarG	Data Sheet
HR10, HR11, HR12, HR13	127 – 1,299	300 – 1000	Download data sheet (PDF)
HR20, HR21, HR22, HR23	287 – 2,432	300 – 1000	Download data sheet (PDF)
HR31, HR32, HR33	792 – 4,367	300 – 1000	Download data sheet (PDF)
HR41, HR42, HR43	1,199 – 7,530	300 – 1000	Download data sheet (PDF)
HR51, HR52, HR53	1,973 – 13,306	300 – 1000	Download data sheet (PDF)
HR61, HR62, HR63	4,265 – 22,150	300 – 1000	Download data sheet (PDF)
HR71, HR72, HR73	6,556 – 37,324	300 – 1000	Download data sheet (PDF)

Applications

Animal feed production
Ash conveying
Alternative fuel plants
Bakeries
Flour Mills
Cereal Plants
Cement Manufacturing
Chemical plants
Pharmaceutical plants

Plaster manufacturing
Grain processing
Coal and coal powered plants
Plastic and plastic compound manufacturing
Blower film applications
Primary furnace air
Steel production
Synthetic wood production
Wood chip and pellet processing

Waste water treatment works
Aeration
Oxygenation
Pneumatic conveying systems
Bulk handling systems
Paper mills
Fish farms
Vehicle application

For more information please view our applications page

Design Features

The conservative load carrying capacity of the larger diameter rolling element bearings ensures an 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 is substantially increased by the use of taper mounted gears which do not need keyways for location.

Setting of the gear wheels to obtain 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 tming 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 is in accordance with metric standards.

Specification

CASING: The cylinder and headplates are manufactured from cast iron. The gearcase is manufactured from aluminium.

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 taper 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 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 air flow. Standard machines have a right hand drive shaft for vertical air flow, and a bottom drive shaft for horizontal air flow. 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.