Roots vacuum pump is a commonly used vacuum pumping equipment. The following is a detailed introduction to it:
1、 Definition and Working Principle
Roots vacuum pump (abbreviated as Roots pump) refers to a variable volume vacuum pump that is equipped with two blade shaped rotors that rotate synchronously in opposite directions inside the pump. There are small gaps between the rotors and between the rotors and the inner wall of the pump casing, but they do not touch each other. It relies on the synchronous and reverse rotation of a pair of blade shaped rotors inside the pump chamber to move gas and achieve pumping. The two "8" - shaped rotors of the Roots vacuum pump are installed perpendicular to each other on a pair of parallel shafts, and are synchronously rotated in opposite directions by a pair of gear belts with a transmission ratio of 1. The clearance maintained between rotors and between rotors and the inner wall of the pump casing enables high-speed operation.
2、 Structural composition
The structure of Roots vacuum pump mainly consists of two rotors, pump casing, gears and other components. According to the arrangement of the rotor, there are generally three schemes for the overall structure of Roots vacuum pumps: vertical, horizontal, and vertical shaft. In addition, according to actual needs, Roots vacuum pumps may also be equipped with accessories such as overflow valves and steam condensers.
3、 Performance characteristics
1. No lubrication required: The rotors of Roots vacuum pumps do not come into contact with each other or with the pump casing, with a gap of generally 0.1~0.8 millimeters. Therefore, no oil lubrication is needed to avoid contamination of the vacuum system by oil vapor.
2. High pumping speed: Roots vacuum pump has a stable and relatively high pumping speed over a wide pressure range, which can quickly discharge suddenly released gases.
3. Fast start-up: Roots vacuum pump starts quickly and can reach a vacuum state in a very short time.
4. Simple structure: Roots vacuum pump has a compact structure, low noise, and low maintenance costs.
5. Significant energy-saving effect: Roots vacuum pump has advanced design, reasonable structure, gaps between rotors and between rotors and pump body, no contact, no lubrication, low friction loss, and can achieve high pumping speed with low power.
6. However, Roots vacuum pumps also have some drawbacks, such as difficulty in assembly, high requirements for machining accuracy, and inferior hydrogen removal efficiency compared to oil booster pumps.
4、 Application Fields
Roots vacuum pumps are widely used in equipment such as petroleum, chemical, plastic, pesticide, turbine rotor dynamic balancing, aerospace space simulation, as well as vacuum metallurgy, chemical, food, pharmaceutical industries and other fields. It is particularly suitable for use in vacuum systems that require high pumping speed under low inlet pressure, such as vacuum drying, vacuum impregnation treatment, vacuum heat treatment, etc. for power transformers, power capacitors, and power transformers.
5、 Selection and Precautions
When selecting, comprehensive consideration should be given to actual production needs, such as pumping rate, vacuum degree, gas properties, and other factors. At the same time, attention should also be paid to factors such as equipment performance, quality, and after-sales service to ensure that the selected equipment can meet production needs and have good cost-effectiveness.
In addition, when using a Roots vacuum pump, the following points should be noted:
1. Regularly inspect and maintain equipment to ensure its normal operation.
2. Pay attention to lubrication and cooling of the equipment to avoid overheating or wear.
3. Avoid prolonged operation of equipment under overload conditions to extend its service life.
In summary, Roots vacuum pump is a vacuum pumping equipment with simple structure, stable performance, and wide application. When selecting and using, comprehensive consideration should be given to actual needs, and attention should be paid to equipment maintenance and upkeep.
