Selection and Introduction of Roots Vacuum Pumps
Release date:
2021-05-13
Roots vacuum pumps are mostly used in industrial applications. Their primary function is as rough pumps that utilize a liquid as the working medium. However, to fully harness the performance of these products, it’s not enough to simply pay attention during operation—careful consideration is also needed when selecting the pump model. The operating pressure of the vacuum pump must meet the requirements of the vacuum equipment.
Roots vacuum pump Mostly used in industrial applications, these are coarse pumps that primarily utilize liquids as their working medium. However, to fully harness the product’s performance, it’s not enough to simply pay attention during operation—careful consideration is also needed when selecting the pump model.
The working pressure of the vacuum pump should meet the requirements of the vacuum equipment.
Reasonable selection of the operating point for Roots vacuum pumps. Each pump has a specific working pressure range, and the pump’s operating point should be chosen within this range; it must not be allowed to operate continuously at pressures below 10^-8 millimeters of mercury.
Under its operating pressure, the vacuum pump should be able to exhaust all gases generated during the operation of the vacuum equipment.
Product Introduction
Roots vacuum pump (Abbreviated as Roots pump) The Roots pump achieves its pumping action through a pair of figure-8-shaped rotor systems. These rotors, which rotate in opposite directions, interact with each other in a mutually supportive manner. When the rotors and the pump casing form a suction chamber, the two rotors never maintain a complete seal, thereby ensuring that gas from the exhaust port does not flow back into the inlet, thus enabling the pumping function.
The rotor's anti-synchronous self-rotation is achieved through a pair of gears mounted on the rotor shaft. Since there is no friction within the pump chamber, Roots vacuum pumps can operate at high speeds—1500 to 3000 rpm—without lubrication inside the pump chamber. Moreover, to ensure smooth and stable high-speed operation of the Roots vacuum pump, the rotors must be dynamically well-balanced. During high-speed rotation, there is no direct contact between the rotors themselves or between the rotors and the pump housing.
Roots vacuum pump There is a built-in relief valve between the inlet and the outlet. Its function is as follows: When the pressure difference between the inlet and the outlet reaches a certain threshold, the relief valve automatically opens, allowing a portion of the gas to escape through the exhaust port. The relief valve then returns the excess gas to the inlet, significantly reducing the workload on both the rotary pump and the forepump (front-stage pump) under high-pressure differentials. Meanwhile, thanks to the robust discharge capability of the open-type pressure-reducing valve, it ensures that the roots pump and the forepump can start up without overloading them, thereby enhancing the performance of the roots pump unit even under high inlet pressures.
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