Roots vacuum pump

Abstract

The invention provides a Roots vacuum pump, which belongs to the technical field of machinery and solves the technical problems of hard load start, high starting current, high impact on an electricity grid, high bearing impact, and the like of the existing Roots vacuum pump. The Roots vacuum pump comprises a pump body and a long pump shaft and a short pump shaft arranged in the pump body, wherein, rotors are respectively connected on the long pump shaft and the short pump shaft, the long pump shaft and the short pump shaft are connected with each other by a pair of engaged driver gears, one end of the long pump shaft extends out of the pump body on which an electric motor is arranged, and a rotating shaft of the electric motor and the pump shafts are connected by hydraulic driving mechanisms. The Roots vacuum pump has the advantages of favorable overload protection, low starting current, easy load start, short air suction time, etc.

Description

technical field [0001] The invention belongs to the technical field of machinery and relates to a vacuum pump, in particular to a Roots vacuum pump. Background technique [0002] Roots vacuum pump unit is a commonly used vacuum obtaining equipment. Usually it needs to be equipped with a backing pump to work. Since the pumping speed of the backing pump is generally lower than that of the Roots pump, a pressure difference will be generated between the outlet and the inlet of the Roots pump during operation. When the pressure difference exceeds a certain value, It will cause the Roots pump to be overloaded and affect the normal operation of the Roots pump. [0003] The maximum allowable pressure difference is an important performance index of the Roots pump. In order to ensure the safe operation of the Roots pump, the pump is not allowed to operate for a long time under the condition of exceeding the maximum allowable pressure difference. In order to solve this problem, an ov...

AI Technical Summary

Problems solved by technology

This kind of mechanical impact directly bears the above-mentioned impact on the rotor parts, gears, positioning between gears and shafts inside the Roots pump, and the coupling between the shaft of the Roots pump and the shaft of the motor, which is particularly prone to problems.

This is an important reason for the premature failure and shortened service life of the mechanical parts of the Roots pump.

[0007] 2. Since the Roots pump motor has the heaviest load when it starts, the motor will be overloaded momentarily, causing an impact on the power grid, and thus causing instantaneous fluctuations in the power grid voltage, and even partial power failure due to overloading of the power grid

Especially for Roots pumps with high pumping speed, the impact of this kind of motor overload on the power grid will be more serious

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