A hybrid vacuum pump system

Abstract

The invention discloses a mixed vacuum pump system comprising a vacuum chamber, wherein the outlet of a gas cooling and dust removing device is divided into two paths; one path is communicated with a steam jet (and water ring) type vacuum pump system through a third gas suction pipeline and is provided with a second vacuum shutdown valve; the other path is communicated with a mechanical vacuum pump system through a second gas suction pipeline and is provided with a first vacuum shutdown valve; a second exhaust pipeline of the steam jet (and water ring) type vacuum pump system and a first exhaust pipeline of the mechanical vacuum pump system extend out of a workshop after being converged in front of a flowmeter and passing through a third exhaust pipeline; the first exhaust pipeline is provided with a first gas check valve; the second exhaust pipeline is provided with a second gas check valve. The steam jet (and water ring) type vacuum pump system is combined with the mechanical vacuum pump system in an external refining treatment process of molten steel, so that the requirement of an external refining process is sufficiently met, and meanwhile, the requirements for high efficiency and energy saving are met.

Description

technical field [0001] The invention relates to the technical field of vacuum refining devices outside the molten steel furnace, in particular to a hybrid vacuum pump system. Background technique [0002] At present, there are three types of equipment for providing vacuum smelting conditions required by the molten steel refining device outside the furnace, namely pure steam jet vacuum pump, pure mechanical vacuum pump and steam jet + water ring vacuum pump system. [0003] The pure steam jet vacuum pump system generally consists of 4-stage, 5-stage and 6-stage multi-stage steam jet vacuum pumps in different forms. [0004] Pure mechanical vacuum pump system generally consists of various dry mechanical pumps or wet mechanical pumps. Dry mechanical pumps are commonly used Roots pumps, screw pumps, etc., and wet mechanical pumps are commonly used oil rotary vane pumps, water ring pumps, etc. Among them, since the vacuum degree provided by the pure water ring vacuum pump for m...

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Problems solved by technology

[0005] As we all know, the consumption of steam and cooling water in the steam jet vacuum pump is obvious, but this kind of vacuum pump system has large pumping capacity, fast pumping speed, simple operation and low maintenance cost, and can be well applied to various molten steel refining outside the vacuum furnace The requirements of the process; the mechanical vacuum pump has low energy consumption, but the pumping capacity is small, the pumping speed is slow, the maintenance cost is high, and the investment cost is high. At present, it is not well suitable for the needs of various refining processes outside the vacuum furnace of molten steel; steam Jet + water ring vacuum pump transformation is simple, but the vacuum degree of water ring vacuum pump is low, energy saving is limited

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