In order to ensure the better use of Roots vacuum pump, Roots vacuum pump in the process of using the need to avoid the occurrence of Roots vacuum pump overload phenomenon, then how should it be avoided? Roots vacuum pump small make up to take you to understand.
1. Adopt the mechanical automatic pressure regulating bypass valve (relief valve) which comes with the Roots vacuum pump.
The bypass valve is installed in the bypass line between the outlet and inlet of the Roots vacuum pump. This valve controls the pressure difference between the pump inlet and outlet from exceeding the rated value.
When the differential pressure reaches the rated value, the valve opens automatically by differential pressure, so that the outlet and inlet of the Roots vacuum pump are connected, so that the differential pressure between the inlet and outlet is rapidly reduced, and then the Roots vacuum pump works under the load of almost no differential pressure.
When the differential pressure falls below the rated value, the valve closes automatically and the gas is pumped through the Roots vacuum pump by the preceding pump.
Roots vacuum pumps with bypass relief valves can be started at the same time as the preceding pump, making unit operation simple and convenient.
2. Adoption of hydraulic coupling Adoption of hydraulic coupling can also prevent the overload phenomenon of the pump, so that the pump can work under high differential pressure.
The hydrodynamic coupling is mounted between the pump and the electric motor. Under normal operating conditions, the hydrodynamic coupling transmits the rated torque from the motor end to the pump.
The maximum differential pressure of a Roots vacuum pump is determined by the maximum torque that can be transmitted by the fluid coupling, which is regulated by the amount of fluid in it.
When the pump works under high differential pressure or starts at the same time as the predecessor pump, a speed difference, i.e. sliding, is generated inside the liquid coupling, which only transmits a certain torque to decelerate the pump.
As pumping proceeds, the gas load decreases and the Roots vacuum pump gradually accelerates to its rated speed.
3. Adopting vacuum electrical components to control the pump inlet pressure
Place pressure-sensitive components such as vacuum gauges or electric contact vacuum pressure gauges at the inlet line of the Roots vacuum pump.
After the vacuum system is started, when the pressure at the inlet of the Roots vacuum pump is lower than a given value (pump start-up pressure allowed), the pressure-sensitive element sends out a signal to open the Roots vacuum pump via the electrical control system (if the vacuum system is equipped with a Roots vacuum pump by-pass pipeline, the by-pass pipeline valve is closed at the same time).
If the pump inlet pressure is higher than the specified value, the Roots vacuum pump is automatically shut down (or the pump bypass line valve is opened at the same time), thus ensuring the reliable operation of the Roots vacuum pump.