Vacuum-pumping system for wind tunnel body

Abstract

The invention relates to a vacuum-pumping system for a wind tunnel body. The vacuum-pumping system includes a multi-level air cooled lobe pump assembly, a set of heat exchangers, a silencer, an overflow valve, and a check valve; the upper part of each air cooled lobe pump is provided with an air inlet, and the lower part of each air cooled lobe pump is provided with an air outlet; two sides of each air cooled lobe pump are provided with a cool air returning opening respectively, so that heat balance of a pump body can be maintained when the pump operates under a high pressure difference; when the pressure of an air inlet connected to the back end of the lobe pump system is greater than the discharge pressure of the lobe pump assembly, a part of pumped air can be directly discharged into the silencer via the overflow valve, and then is discharged into the atmosphere via the silencer; the other part of the pumped air is discharged into the atmosphere via the overflow valve and the silencer. Each vacuum heat exchanger of the system mainly includes a housing, heat exchanger tubes, and an anti-reflux valve. A PLC control technology and a frequency converter technology are adopted by the system, so that the vacuum-pumping system can automatically adjust the pumping speed according to the pressure of an entrance.

Description

technical field

[0001] The invention relates to a vacuum pumping system for a wind tunnel body, in particular to a vacuum pumping system for a wind tunnel body using a large, high-pressure-difference-resistant air-cooled Roots vacuum pump. Background technique

[0002] Roots pumps are widely used in vacuum degassing, vacuum smelting, vacuum treatment of molten steel in the vacuum metallurgical industry, as well as vacuuming non-corrosive gases in devices such as space simulation and low-density wind tunnels. It can also be used in production processes such as distillation, evaporation, and drying in industries such as chemical, food, pharmaceutical, and electrical appliances.

[0003] The structure of Roots vacuum pump is composed of pump housing, rotor and transmission part. There is a certain gap between the rotor of the pump and the rotor and the pump casing, and the gap value and relative rotation position are guaranteed by the high machining accuracy and synchronous sp...

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