Mixed 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 a vacuum refining device outside a molten steel furnace, in particular to a hybrid vacuum pump system. Background technique [0002] At present, there are three forms of equipment for providing vacuum smelting conditions required by the refining device outside the molten steel 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] Purely mechanical vacuum pump systems generally consist of various dry mechanical pumps or wet mechanical pumps. Roots pumps, screw pumps, etc. are commonly used for dry mechanical pumps, and oil rotary vane pumps, water ring pumps, etc. are commonly used for wet mechanical pumps. Among them, since the vacuum provided by the pure water ring vacuum pump fo...

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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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