Products
Roots fan consists of: casing, wall panels, impeller, oil tank, muffler five major components. Belong to the volumetric fan, impeller end face, fan front and rear end caps. The principle is to use two leaf-shaped rotor in the cylinder for relative motion to compress and transport gas rotary compressor. This kind of blower is simple in structure, easy to manufacture, widely used in aquaculture oxygenation, sewage treatment aeration, cement conveying, more suitable for low pressure occasions of gas conveying and pressurizing system, can also be used as a vacuum pump and so on.
Product Characteristics
(1). Constant volume fan, no internal compression, conveying gas is mandatory, with the change of pressure, the flow rate change is very small.
(2). The product adopts three-bladed linear impeller, inlet and exhaust pulsation is smooth, low noise.
(3). The impeller adopts special curve to make the meshing more reasonable, small leakage, high efficiency and low energy consumption.
(4). The product adopts a variety of new structural design, which makes the whole machine compact, small volume, light weight and beautiful appearance
(5). The product adopts high-precision hardened synchronous gears with long life and low noise.
(6). The conveying air is clean and does not contain any oil dust.
technical performance
I. Roots fan technical performance requirements
1.All Roots fans are equipped with a base, assembling Roots fans and motors on the same base.
2. Roots fan with a base, including the ground bolt
II.Second, Roots fan impeller and lubrication system
1. Rotation: facing the fan pulley (coupling), the left side of the counterclockwise direction of rotation for the positive direction; the right side of the clockwise direction of rotation for the positive direction.
2. It adopts three impellers and a box with helix shape, which is equipped with three leaf-shaped impellers, with tiny gap, so there will not be any phenomenon of touching each other.
3. The impeller is made of ductile cast iron QT500-7 and the shaft is made of No.45 high quality Lai Steel. The impeller profile is composite type, less leakage during operation.
In the high-speed operation of the shaft and the impeller to maintain the interference between 0.01MM, so that the leaf shaft in high-speed operation does not loosen.
4. The synchronizing gear of Roots fan adopts spur gear structure, which has smooth transmission and oil immersion lubrication for lower noise.
5. One end of the bearing of Roots fan adopts splash lubrication, and the other end of the bearing adopts grease lubrication. The fan with double oil tanks adopts splash lubrication at both ends.
6. The cooling method of Roots fan is water cooling/air cooling, the transmission method is direct drive/belt pulley, and the fan is a single-stage fan.
7. The motor is compatible with the institutional characteristics, working conditions and environmental conditions of the Roots fan, the insulation class of the motor is F, the protection class is IP54, 380V, 50HZ.
8. Lubricant specification: gear lubricant grade: N220, bearing lubricant grade: lithium grease ZL-3.
Performance Assurance
Roots fan unit components.
1. The design service life of the whole fan is not less than 10 years.
2. The design service life of the impeller is not less than 60,000 hours.
3. The design service life of the bearings is not less than 30,000 hours.
4. The design service life of gears is not less than 60,000 hours.
5. The quality guarantee period of the unit is 12 months after delivery.
6. Fan to ensure that the required flow and pressure, the power consumed by the strict implementation of the standard provisions.
7. fan vibration value: both ends of the axial radial value control is less than 0.04MM, radial level control is less than 0.02MM, axial control is less than 0.02MM. Roots fan performance and system and other requirements!
Fan Characteristics
Roots fan components.
1. Three-bladed impeller, rotating speed increased by 3%.
2. Small volume structure, simple maintenance, saving energy consumption by 10%.
3. Adopting figure-of-eight wind blades, high air pressure.
4.Double oil tank design, bearing lubrication more thoroughly.
Fan Performance
| Model | Air volume（m³/min） | Wind pressure（mmAq) | Speed（rpm) | Power（KW） |
| LB-40 | 1.02-1.73 | 1000-5000 | 850-1250 | 0.75-3.0 |
| LB-50 | 1.85-2.70 | 1000-6000 | 1350-1950 | 1.5-5.5 |
| LB-65 | 2.89-3.50 | 1000-7000 | 2050-3050 | 2.2-7.5 |
| LB-80 | 4.50-7.55 | 1000-7000 | 2050-3050 | 4.0-15.0 |
| LB-100 | 9.08-13.90 | 1000-8000 | 2050-3050 | 4.0-22.0 |
| LB-125 | 10.34-19.22 | 1000-8000 | 1850-3250 | 5.5-45.0 |
| LB-150 | 26.0-58.35 | 1000-8000 | 1850-3250 | 7.5-55.0 |
| LB-200 | 35.0-78.27 | 1000-9000 | 1750-2850 | 11-110.0 |
| LB-250 | 67.55-133.35 | 1000-9000 | 1750-2850 | 15-132 |
| LB-300 | 111.7-218.42 | 1000-10000 | 1390-2450 | 18.5-20 |
Fan Installation Diagram
All Roots fan accessories include base, transmission, inlet and outlet silencers, pressure gauges, safety valves, flexible joints,
check valves, shock absorbing pads, ground bolts and their connecting parts, etc.
application scenario
Roots fan: widely used in aquaculture oxygenation, sewage treatment aeration, cement conveying, more suitable for low-pressure occasions
It is more suitable for low pressure occasions of gas conveying and pressurizing system, and can also be used as vacuum pumps and so on.
