roots vacuum pump
Roots vacuum pump working principle
The working principle of Roots blower can be simply summarized into the following steps:
- Suction stage: When the rotor rotates, the volume of the chamber gradually increases, forming a low-pressure area.This low-pressure area attracts outside air into the chamber.
- Compression stage: As the rotor continues to rotate, the volume of the chamber gradually decreases.This process causes the air to become compressed, increasing its pressure.
- Exhaust stage: When the volume of the chamber reaches the minimum value, the compressed air will be discharged from the chamber.At this time, the rotation of the rotor will increase the volume of the chamber again to prepare for the next round of suction.
- By repeating the above steps, the Roots blower can continuously suck in, compress and discharge air.This working principle enables Roots blowers to produce high-pressure, high-flow airflow.
What is a root vacuum pump?
The Roots vacuum pump is a rotary positive displacement vacuum pump whose structure is evolved from the Roots blower. It first appeared in Germany in 1944, mainly for use as a mechanical booster pump in vacuum melting systems with large pumping speeds in the pressure range of 10 to 1000Pa. According to the different working pressure range of Roots vacuum pump, it can be divided into low vacuum Roots pump with direct discharge to the atmosphere, medium vacuum Roots pump (mechanical booster pump) and high vacuum multi-stage Roots pump.
The working principle of the Roots vacuum pump is based on two blade-shaped rotors that rotate synchronously in opposite directions. There are small gaps between the rotors and between the rotors and the inner wall of the pump casing without contact with each other, forming a variable volume vacuum pump. This design makes Roots vacuum pumps have the characteristics of fast startup, low power consumption, and low operation and maintenance costs. Therefore, it has been tested for long-term operation in petroleum, chemical industry, plastics, pesticides, steam turbine rotor dynamic balancing, aerospace space simulation and other devices. , and are widely used in petroleum, chemical industry, metallurgy, textile and other industrial fields. In addition, Roots vacuum pump is also used for noise control of vacuum pumps. As an important vacuum equipment, it is widely used in various industrial fields and has become an ideal choice for handling large amounts of gas and low vacuum requirements.
What is the difference between Roots blower and vacuum pump?
- The main difference between Roots blowers and Roots vacuum pumps is that although their uses and working principles are similar, the specific application scenarios and exhaust methods are different.
- Different purposes: Roots blower is usually used to transport low-pressure gas and gas boosting, and is a kind of wind conveying mechanical equipment; Roots vacuum pump is used to transport gas to high vacuum, and is a kind of vacuum pump.
- Working principle: The working principles of the two are basically the same. They both pass through two intermeshing impellers. After the inhaled gas is compressed and transmitted by the impellers, the pressure increases, and then it is discharged from the air outlet. Specifically, the Roots blower increases the pressure of the gas through the compression and transmission of the impeller, and then discharges it from the air outlet; while the Roots vacuum pump uses the operation of the impeller to cause the gas to flow into the cavity from the air inlet and undergo multiple compressions. Finally, it is discharged to achieve the purpose of increasing the vacuum degree.
- Exhaust method: Roots blower discharges gas directly through the air outlet; Roots vacuum pump needs to discharge gas through other forms of diffusers, molecular pumps, etc.
- In general, Roots vacuum pump is a device used for vacuum conveying and vacuum degree improvement, while Roots blower is a device used to convey low-pressure gas and pressurized gas. The basic principles of the two are the same, but in specific applications and There is a difference in the exhaust method.
What is the range of roots pump?
- The working range of Roots pump is 1×10^3~1 Pa.
- Roots pump is a rotary variable volume vacuum pump, which evolved from Roots blower. It has the ability to provide a large pumping speed in a wide pressure range, and is especially suitable for use as a mechanical booster pump in vacuum melting systems within a pressure range of 10~1000 Pa. According to different working ranges, Roots pumps are divided into low vacuum Roots pumps that discharge directly to the atmosphere, medium vacuum Roots pumps (also known as mechanical booster pumps) and high vacuum multi-stage Roots pumps.
- The working principle of the Roots pump is based on the rotational motion of the rotor. By maintaining a certain gap between the rotors and between the rotor and the inner wall of the pump casing, high-speed operation is achieved, so that it can operate within a wide pressure range (1×10^3~1 Pa) has a large pumping speed. In addition, the Roots pump also has the characteristics of quick start, insensitivity to dust and water vapor contained in the pumped gas, no need for lubrication of the rotor, no oil in the pump chamber, small vibration, good dynamic balance conditions of the rotor, no exhaust valve, and high driving power. It has the characteristics of small size, small mechanical friction loss, compact structure, small floor space and low operation and maintenance costs.
