How to prevent the overload of Roots vacuum pump

How to prevent the overload of Roots vacuum pump

The power required by roots vacuum pump to compress gas is directly proportional to the pressure difference. Once the air pressure difference is too high, the roots pump may be overloaded, which will cause the motor winding to burn down. How to prevent overload of Roots vacuum pump is as follows:

(1) use mechanical automatic pressure regulating bypass valve

The bypass valve is installed on the through pipe side between the outlet and inlet of Roots vacuum pump. The valve controls the pressure difference between the inlet and outlet of the pump not to exceed the rated value. When the pressure difference reaches the rated value, the valve will automatically open through the pressure difference, so that the outlet and inlet of Roots vacuum pump are connected, and the pressure difference between the inlet and outlet is rapidly reduced. At this time, the roots vacuum pump almost no pressure difference. When the pressure difference is lower than the rated value, the valve will close automatically and the gas will be pumped out from the front stage pump to roots vacuum pump. Roots vacuum pump with bypass overflow valve can be started at the same time with the previous pump, so that the equipment is easy to operate.

(2) use hydraulic coupling

The use of hydraulic coupling can also prevent overload of Roots vacuum pump, thus allowing roots vacuum pump to operate under high pressure difference. The hydraulic coupling is installed between the pump and the motor. Under normal operating conditions, the hydraulic coupling transmits the rated torque from the motor end to the pump. The maximum pressure difference of Roots vacuum pump is determined by the maximum torque transmitted by the hydraulic coupling, and the maximum torque transmitted by the hydraulic coupling is regulated by the amount of liquid in it. When roots vacuum pump works under high pressure difference or starts at the same time with the front pump, the speed difference will slip inside the hydraulic coupling, and only transfer a certain torque to slow down the pump. With the pumping process, the gas load is reduced, and the roots vacuum pump is gradually accelerated to the rated speed.

 

(3) use vacuum electronic components to control the inlet pressure of Roots vacuum pump

Pressure sensitive components (such as vacuum bellows relay or electric contact vacuum gauge) are placed on the inlet pipeline of Roots vacuum pump. After starting the vacuum system, when the pressure at the inlet of the roots vacuum pump is lower than the given value (allowable starting pressure of the pump), the pressure-sensitive component will send a signal and the electric control system 020 - will open the 0 (if the vacuum system is equipped with roots vacuum pump) through line, and then close the side through line valve. If the pump inlet pressure is higher than the specified value, the roots vacuum pump will automatically close (or simultaneously open the line valve beside the pump), so as to ensure the reliable operation of Roots vacuum pump.

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