A Centrifugal Vacuum Pump Protection Device Used in Ultra-High Speed ​​Wind Tunnel

Abstract

The invention discloses a centrifugal vacuum pump protection device used in an ultra-high-speed wind tunnel. The protection device includes auxiliary valves, linkages and branch pipelines; the branch pipelines are perpendicular to the main pipeline and located downstream of the main valve, the main valve is installed on the main pipeline, and the auxiliary valves are installed on the branch pipelines. The active end of the valve stem of the auxiliary valve is connected by a linkage; the degree of freedom of movement of the linkage is 90°, at the position of the main valve, when the apex angle of the linkage is 30°, the main valve opens and the auxiliary valve closes , when the top angle of the linkage mechanism is 150°, the main valve is closed and the auxiliary valve is opened. The protection device can avoid the "blind pumping" phenomenon of the centrifugal vacuum pump and protect the normal operation of the centrifugal vacuum pump.

Description

technical field [0001] The invention belongs to the technical field of ultra-high-speed wind tunnel test equipment, and in particular relates to a centrifugal vacuum pump protection device used in an ultra-high-speed wind tunnel. Background technique [0002] In the ultra-high-speed wind tunnel test, in order to obtain the airflow of ultra-high Mach number, a vacuum environment is usually used to increase the pressure difference of the test environment downstream of the outlet of the test section to obtain the test conditions of the ultra-high-speed airflow. The vacuum container at the downstream outlet of the section is evacuated. [0003] With the need for ultra-high-speed wind tunnel equipment construction, the scale of wind tunnel construction is getting larger and larger, and the volume of wind tunnel gas will increase accordingly. In time, the scale of the vacuum container will be very large. Therefore, centrifugal vacuum pumps are usually used for the exhaust of lar...

AI Technical Summary

Problems solved by technology

Therefore, centrifugal vacuum pumps are usually used for the exhaust of large supersonic wind tunnel equipment. Centrifugal vacuum pumps are evolved from centrifugal fans. They have the advantages of large displacement, high efficiency, and low power consumption, but their fatal disadvantages are Can not "blind pumping", long-term "blind pumping" working state will lead to surge phenomenon of centrifugal vacuum pump, in severe cases, it will damage the centrifugal vacuum pump

During the ultra-high-speed wind tunnel test, since the centrifugal vacuum pump needs to be turned on in advance to be in working condition, the cut-off valve at the front end of the centrifugal vacuum pump is closed at this time, causing the centrifugal vacuum pump to be in the "blind pumping" working state for a certain period of time

Images