Protection control method used for roots vacuum pump

Abstract

The invention relates to a protection control method used for a roots vacuum pump. The protection control method comprises a vacuum pump differential pressure control step and a motor fault protection step. The vacuum pump differential pressure control step comprises the procedures that pressure of an exhaust port of the vacuum pump is collected in real time, and whether the pressure exceeds a set value is judged; and if yes, according to the differential pressure of the current pressure and the set value, a controller controls a corresponding overflow electromagnetic valve to be opened or closed to adjusting the ratio of the power of a pump body to the differential pressure. The motor fault protection step comprises the procedures that motor fault signals of the vacuum pump vacuum pump are collected in real time, and whether a fault occurs to the motor is judged according to the fault signals; if yes, the controller sends the corresponding fault signal to a display screen, the corresponding fault signal is displayed, an alarm is given; and if a serious fault occurs, the controller gives a stop instruction. Compared with the prior art, the protection control method has the advantage that the operational reliability and performance of the vacuum pump can be improved effectively.

Description

technical field [0001] The invention relates to the field of vacuum pump control, in particular to a protection control method for a Roots vacuum pump. Background technique [0002] Roots vacuum pumps have the advantages of quick start, low power consumption, low operation and maintenance costs, and high efficiency, and are widely used in industrial and mining enterprises. Roots vacuum pumps are also widely used in the paper processing industry. The working process is that the rotor sucks air into the casing from the air inlet, then enters the exhaust pipe from the air outlet, and then is transported out by the exhaust pipe. The existing traditional Roots vacuum pump has the following problems in its work, [0003] 1. The power required by the Roots vacuum pump to compress the gas is proportional to the pressure difference. Once the gas pressure difference is too high, the pump may be overloaded. The factory design of the Roots vacuum pump is that the power is directly pro...

AI Technical Summary

Problems solved by technology

[0003] 1. The power required by the Roots vacuum pump to compress the gas is proportional to the pressure difference. Once the gas pressure difference is too high, the pump may be overloaded.

The factory design of the Roots vacuum pump is that the power is directly proportional to the pressure difference, but in actual production, due to product structure problems, the gas consumption sometimes becomes smaller, and the vacuum degree will increase at this time, causing the motor to "stuff the pump". Handling the motor will burn out

[0004] 2. When a foreign matter falls from the air inlet of the Roots vacuum pump, it will cause the foreign matter to be stuck in the two "8"-shaped rotors, causing the motor current to rise sharply

[0005] 3. Poor lubrication of internal gears and bearings of the Roots vacuum pump will cause overheating, and eventually the motor current will increase.

[0006] These reasons are easy to cause the motor winding to burn out. After the burnout, all machines need to be shut down for maintenance, which will directly increase the loss of production shutdown and reduce production efficiency.

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