What is the basic principle of a three-lobe Roots blower?
Release date:
2021-09-07
The three-lobe Roots blower, also known as the Roots blower, is a positive-displacement rotary blower that uses two to three lobe-shaped rotors to perform relative motion within a cylinder, thereby compressing and conveying gases. This blower features a simple structure and is easy to manufacture. It is suitable for gas transportation and pressurization under low-pressure conditions and can also be used as a vacuum pump.
The three-lobe Roots blower, also known as the Roots fan, is a positive-displacement rotary blower that uses two to three lobe-shaped rotors to perform relative motion within a cylinder, thereby compressing and conveying gases. This blower features a simple structural design and convenient manufacturing technology, making it suitable for transporting gases under low-pressure conditions in general applications. It can also be used as a vacuum pump.
What is the basic principle behind the three-lobe Roots blower? Let’s analyze it together below.
The Roots blower is a positive-displacement rotary blower. In this type of compressor, gears mounted at the ends of the rotor shafts rotate in synchronization, enabling the two rotors to mesh with each other. The recessed surface sections of the rotors, together with the inner wall of the cylinder, form the working volume. As the rotors rotate, they draw gas from the inlet port and move it toward the outlet port. At the moment when the working volume connects to the outlet port, the high-pressure gas flows back into the volume, causing an abrupt increase in pressure within the effective working volume and thus pushing the gas into the exhaust passage. The two rotors do not come into contact with each other; instead, they are sealed by precisely controlled gaps between them. Consequently, the discharged gas remains free from lubricant contamination.
What are the main features of a three-lobe Roots blower? Let’s analyze them together below.
The most significant feature is that, when the pressure is adjusted within the allowable range during operation, the flow fluctuations are minimal. It offers a wide selection range for pressure settings and is characterized by its ability to forcibly convey gases. The medium transported contains no oil. The structure is simple, making maintenance and management convenient; it boasts a long service life and exhibits low vibration throughout the entire system.
Vacuum pump. The periodic intake, exhaust, and instantaneous compression at varying capacities lead to pulsations in airflow velocity and pressure, thereby generating greater gas-dynamic noise. Additionally, the clearance between the rotor and the cylinder during operation can cause gas leakage, reducing production efficiency. Roots blowers have an air displacement ranging from 0.15 to 150 m³/min and operate at speeds of 150 to 3,000 rpm. The pressure ratio for a single-stage blower is typically less than 1.7; however, they can be used in multi-stage series configurations, with the maximum achievable pressure ratio reaching up to 2.1.
What is the primary medium handled by a three-lobe Roots blower? Let’s analyze this together below.
Roots blowers are designed for handling clean air, clean gases, sulfur dioxide, other inert gases, special gas industries (such as industrial gases, biogas, carbon dioxide, sulfur dioxide, etc.), and products operating under high-pressure conditions. Given these characteristics of our company, our products can be widely adapted to the metallurgical, chemical, fertilizer, petrochemical, instrumentation, and building materials industries.
What is the structure of a three-lobe Roots blower? Let’s analyze it together below.
Depending on the shape of the rotor, Roots blowers can be classified into two-lobed and three-lobed types. In the three-lobed rotor, each rotation draws in and discharges air three times per cycle. Compared to the two-lobed type, the three-lobed rotor exhibits smaller body pulsations, lower vibration, and reduced noise levels.
What are the parameters of a three-lobe Roots blower? Let’s analyze them together below.
The Roots blower operates at speeds ranging from 150 to 3,000 rpm. Its flow rate is between 0.15 and 1,200 cubic meters per minute, with pressures ranging from 9.8 to 196 kilopascals. The power consumption ranges from 0.75 to 1,000 kilowatt-hours, and the standalone weight varies from 100 to 900 kilograms.
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