How to solve 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 gas pressure difference is too high, the pump may overload and cause motor winding burning The main methods to solve the problem of pump overload are as follows: (1) mechanical automatic pressure regulating bypass valve is adopted The bypass valve is installed on the bypass pipe between the outlet and inlet of Roots vacuum pump This valve controls the pressure difference between the pump inlet and outlet not to exceed the rated value When the pressure difference reaches the rated value, the valve automatically opens by the action of the pressure difference, so that the outlet and the inlet of Roots vacuum pump are connected, so that the pressure difference between the inlet and the outlet is reduced rapidly At this time, roots vacuum pump works under almost no pressure difference load When the pressure difference is lower than the rated value, the valve will close automatically and the gas will be pumped out by the front stage pump through roots vacuum pump The roots vacuum pump with bypass overflow valve can be started at the same time with the previous pump, which makes the operation of the unit simple and convenient (2) hydraulic coupling is adopted The adoption of hydraulic coupling can also prevent the overload of the pump, so that the pump can work under high pressure difference The hydraulic coupling is installed between the pump and the motor Under normal working condition, the hydraulic coupling transmits rated torque from the motor end to the pump The large pressure difference of Roots vacuum pump is determined by the large torque transmitted by the hydraulic coupling, and the large torque transmitted by the hydraulic coupling is regulated by the amount of liquid in it When the pump works under high pressure difference or starts at the same time with the front pump, there is a speed difference in the liquid coupling, i.e sliding, which only transmits a certain moment to slow down the pump With the process of pumping, the gas load decreases, and the roots vacuum pump gradually accelerates to the rated speed (3) vacuum electrical components are used to control the inlet pressure of the pump Install pressure sensitive elements such as vacuum capsule relay or electric contact vacuum pressure gauge at the inlet pipeline of Roots vacuum pump After the vacuum system is started, 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 element sends a signal to open the roots vacuum pump through the electrical control system (if the vacuum system is equipped with the roots vacuum pump bypass pipeline, the bypass pipeline valve shall be closed at the same time) If the inlet pressure of the pump is higher than the specified value, the roots vacuum pump will be automatically closed (or the pump bypass pipeline valve will be opened at the same time), so as to ensure the reliable operation of the roots vacuum pump.