Main media of roots blower
Roots blower conveying medium is the first choice for clean air, clean gas, sulfur dioxide and other inert gases, special gas industries ( gas, natural gas, biogas, carbon dioxide, sulfur dioxide, etc. ) and high pressure conditions. In view of the above characteristics, it can be widely adapted to the metallurgical, chemical, fertilizer, petrochemical, instrument, and building material industries .
According to the shape of the rotor, Roots blowers are divided into two-leaf type and three-leaf type. The three-blade rotor is sucked and exhausted three times by two rotors for each rotation. Compared with the two- leaf type, the gas pulsation is small, the vibration is small, and the noise is low .
The rotation speed is 150-3000 rpm. The flow rate is 0.15 to 1200 cubic meters per minute, the pressure is 9.8 to 196 kPa, the power is 0.75 to 1,000 kilowatts, and the weight of a single machine is 100 to 9000 kg.
The biggest feature of the Roots blower is that when the pressure is adjusted within the allowable range, the flow rate changes little, the pressure selection range is wide, and it has the characteristics of forced gas transmission. The medium is oil-free during transport. Simple structure, convenient maintenance, long service life, and low vibration of the whole machine.
Vacuum pump. Due to the periodic suction, exhaust, and instant isovolumetric compression, the pulsation of air velocity and pressure will cause a large aerodynamic noise. In addition, gaps between the rotors and between the rotors and the cylinders cause gas leakage, which reduces efficiency. The displacement is 0.15 to 150 m3 / min, and the rotation speed is 150 to 3,000 rpm. The single-stage pressure ratio is usually less than 1.7, up to 2.1, and can be used in series in multiple stages.
The Roots blower keeps the two rotors meshing by the synchronous gear at the end of the rotor shaft. Each concave curved part of the rotor and the inner wall of the cylinder constitute a working volume. During the rotation of the rotor, gas is taken away from the suction port . When it is moved to the vicinity of the exhaust port and communicates with the exhaust port, there is a high pressure The gas returns, when the pressure in the working volume suddenly rises, and then the gas is delivered to the exhaust passage. The two rotors are not in contact with each other, and the tightly controlled gap between them is used for sealing, so the exhaust gas is not contaminated by lubricating oil.