Nanfeng Negative Pressure Suction Automatic Belt Drive Feeding Roots blower Equipment

The Roots blower is a volumetric blower that relies on two involute shaped "8”The change in the volume of the working chamber formed by the V-shaped rotor during rotation is used to transport gas. Its working principle is the same as that of a gear pump, where each rotor is equivalent to a gear with only two teeth. [1]

Roots blower, also known as Roots blower, is a volumetric rotary blower that uses two blade shaped rotors to move relative in the cylinder to compress and transport gas. This type of blower has a simple structure and is easy to manufacture, suitable for gas transportation and pressurization in low pressure situations, and can also be used as a vacuum pump.

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Basic Principles

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The Roots blower is a volumetric rotary blower. This type of compressor relies on a synchronous gear at the end of the rotor shaft to maintain the two rotorsEngage. Each concave curved part on the rotor and the inner wall of the cylinder form the working volume. During the rotation of the rotor, gas is taken away from the suction port. When it moves to the vicinity of the exhaust port and is connected to the exhaust port, due to the high pressure gas reflux, the pressure in the working volume suddenly rises, and then the gas is transported to the exhaust channel. The two rotors are not in contact with each other, and they are sealed by tightly controlled gaps, so the discharged gas is not contaminated by lubricating oil.

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main features

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Its biggest feature is that when the pressure is adjusted within the allowable range during use, the flow rate changes very little, and the pressure selection range is wide, which has the characteristic of forced gas transmission. The medium does not contain oil during transportation. Simple structure, convenient maintenance, long service life, and low overall vibration.

Vacuum pump. Due to periodic suction, exhaust, and instantaneous isovolumetric compression, pulsations in airflow velocity and pressure can result in significant aerodynamic noise. In addition, the gap between the rotors and between the rotor and cylinder can cause gas leakage, thereby reducing efficiency. The Engine displacement of Roots blower is 0.15~150 m3/min, and the rotating speed is 150~3000 rpm. The single stage pressure ratio is usually less than 1.7, up to 2.1, and can be used in multiple stages in series. [1]

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Main medium

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The conveying medium of Roots blower is clean air, clean gas, sulfur dioxide and other inert gases, which are the preferred products for special gas industries (such as gas, natural gas, biogas, carbon dioxide, sulfur dioxide, etc.) and high-pressure working conditions. Given the above characteristics, it can widely adapt to the metallurgical, chemical, fertilizer, petrochemical, instrument, and building materials industries.

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structure

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According to the shape of the rotor, Roots blowers are divided into two blade and three blade types. The three blade rotor is sucked and vented three times by two rotors for each rotation. Compared with the two blade type, the gas pulsation is small, the vibration is also small, and the noise is low.

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parameter

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The speed of the Roots blower is 150-3000 rpm. The flow rate is 0.15~1200 cubic meters per minute, the pressure is 9.8~196 kilopascals, the power is 0.75~1000 kilowatts, and the weight of a single unit is 100~9000 kilograms.

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difference

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There is a significant difference compared to centrifugal fans:

1. The working principle is different. The centrifugal fan uses curved blades, which use centrifugal force to throw gas to the casing, while the Roots fan uses two 8-shaped blades, with very small gaps between them. By squeezing the two blades, the gas is squeezed to the air outlet.

2. Due to different working principles, their working pressure is generally different. Roots fans have a higher outlet pressure, while centrifugal fans have a lower outlet pressure.

3. The air volume is different. Generally, Roots fans are used in places with low air volume requirements but high pressure requirements, while centrifugal fans are used in places with low pressure requirements and high air volume requirements.

4. The manufacturing accuracy is different. Roots fans require high precision and strict assembly requirements, while centrifugal fans are relatively loose.

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