Performance evaluation index of imported roots vacuum pump

What is the performance evaluation index of imported roots vacuum pump? This article will be elaborated below. Roots pump pumping speed and zero flow compression ratio from the surface, is two completely different concepts, it seems to be unrelated binomial performance indicators. But in fact, they are not only the performance indicators of roots pumping capacity, but also have a very close relationship with each other.

The following analysis of roots vacuum pump pumping speed and zero flow compression ratio.

Generally roots pump must match with the front pump to work, so its pumping speed is closely related to the front pump. Roots pump and liquid ring pump, vane pump, slide valve pump, piston pump can be composed of a variety of vacuum units, and according to different needs, the use of a variety of ratio, so that the vacuum unit has a different limit pressure and pumping speed. Therefore, the so-called roots pumping speed is actually the pumping speed of the vacuum unit. It largely depends on the type and size of the front pump, that is, the ultimate pressure and pumping speed of the front pump.

The change of ambient temperature inevitably affects the measurement of pumping speed, especially when the vacuum degree is high. It indirectly affects the pumping speed by affecting the vacuum degree of the front pump.

Zero flow compression ratio from roots pump itself, that is, from the point of view of design and manufacture, it depends on roots pump rotor profile design, processing and pump assembly, that is, depends on the rotor and rotor, rotor and pump body, rotor and the clearance between the side cover. Good rotor profile can make the rotor in the meshing process to maintain a uniform clearance, so that it is possible to ensure the continuous operation of the maximum allowable differential pressure conditions, choose a smaller clearance. The roughness of the rotor surface can also cause a loss in the compression ratio of the low pressure, because some of the gas adsorbed on the rotor surface at the high pressure side will be released when it is transferred to the low pressure side.

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