Roots pump disassembly procedures

Roots pump disassembly procedures

Roots pump disassembly procedures are as follows :1 release lubricating oil and cooling water; 2. Remove coupling and motor; 3 Remove the bypass pipe and valve; 4 Disassembly bearing; 5 Remove the front and rear end covers and sealing devices; 6. Remove the rotating gear; 7 When disassembling the rotor, note the following :1. When installing the base, carefully adjust the level, otherwise it will affect the clearance between the rotor and the pump body at both ends; 2 Disassembly and assembly parts can not be hammered with hammers; 3 when disassembling, pay attention to the sealing surface, without any scratch and bruising; 4 plane seal using RTV rubber, coating evenly, can not be too thin or too thick; 5 rotor should be carefully adjusted after clearance, clearance adjustment by the regulation, found in excess shall be removed to repair, but after the repair must debug dynamic balancing, dynamic balancing is qualified and then reassemble the overload roots vacuum pump power needed for the compressed gas is proportional to the pressure difference, once the gas pressure difference is too high, the pump overload may appear phenomenon, caused by the burning of the motor winding The main methods to solve the problem of pump overload are as follows :(1) the use of mechanical automatic pressure regulating bypass valve bypass valve installed in the bypass pipe between the exit and the entrance of roots vacuum pump this valve control pump inlet and outlet pressure difference does not exceed the rated value When its differential pressure valve by the differential function automatically open, make the roots vacuum pump export and entry are interlinked, the differential pressure between the inward and outward reduced quickly, at this time the roots vacuum pump in almost no differential pressure under the load of work When the differential pressure is lower than the rating, the valve automatically shut down, gas through the roots vacuum pump by the pump before draining Roots vacuum pump with bypass relief valve can be started at the same time with the front pump, so that the operation of the unit is simple and convenient. (2) Hydraulic coupling can also prevent the phenomenon of overload of the pump so that the pump can work under high-pressure differences. The hydraulic coupling is installed between the pump and the motor Under the normal working conditions, the hydraulic coupling transmits rated torque to the pump from the motor end. The maximum differential pressure of the roots vacuum pump is determined by the maximum torque transmitted by the hydraulic coupling, and the maximum torque transmitted by the hydraulic coupling is adjusted by the amount of liquid in it When the pump works under high-pressure difference or starts at the same time with the front stage pump, there is a difference of speed in the liquid coupling, that is, sliding, and only a certain torque is transmitted so that the pump decelerates. With the progress 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 pump inlet pressure Install a vacuum diaphragm relay or electric contact vacuum pressure gauge and other pressure-sensitive components at the entrance pipeline of the Roots vacuum pump After the vacuum system is started, when the inlet pressure of Roots vacuum pump is lower than the given value (the allowable starting pressure of the pump), the pressure sensing element sends a signal and starts the Roots vacuum pump through the electrical control system (if there is a bypass pipeline of Roots vacuum pump in the vacuum system, the bypass pipeline valve should be closed at the same time). If the pump inlet pressure is higher than the specified value, it will automatically close the roots vacuum pump (or open the pump bypass pipeline valve at the same time), so as to ensure the reliable operation of the Roots vacuum pump

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