Quick-closing valves for water hammer pressure generation

Abstract

The invention provides a fast closing valve used for generating water attack pressure.The fast closing valve comprises a valve body, a pneumatic drive mechanism arranged at the upper end of the valve body, and a brittle fracture assembly arranged between the drive mechanism and the valve body.The valve body is of a stop valve structure and comprises a shell and a valve rod.The brittle fracture assembly comprises a brittle piece, a force transmission ring and a supporting cylinder which are arranged on the valve rod sequentially from top to bottom in a sleeving mode.The force transmission ring is fixedly installed on the valve rod.The supporting cylinder is fixedly installed above a shell.The force transmission ring is fixed to the upper end face of the supporting cylinder.The brittle piece is a round piece with a notch.A breakage groove is engraved in the end face of the brittle piece.The force transmission ring acts on the brittle piece when the valve rod moves down along with the valve rod, so that the brittle piece is broken in a brittle mode.The supporting cylinder is used for supporting and fixing the brittle piece.By the adoption of the brittle piece breakage method, a motion mechanism composed of a piston, a valve rod and a valve head obtains high initial acceleration, and then moves fast downwards, the valve closing speed is increased, and time from full opening to full closing of the valve is smaller than or equal to 5 ms.

Description

technical field [0001] The invention belongs to the technical field of liquid rocket engine test and measurement, and in particular relates to a quick-closing valve used for water hammer pressure generation. Background technique [0002] The water hammer pressure parameter of a liquid rocket engine is the moment when the engine is ignited and shut down, the instantaneous opening and closing of the engine inlet valve causes a sudden change in the flow rate of the propellant, which causes a sharp increase and decrease in the medium pressure of the propellant supply pipeline, and the maximum exceeds Ten times or even dozens of times the rated inlet pressure value. [0003] The water hammer pressure test data is the main reference basis for the design reliability of the engine structure, main valve, test system inlet pipeline and test frame structure. [0004] To carry out accurate water hammer pressure measurement, the measurement accuracy and precision of the water hammer pre...

AI Technical Summary

Problems solved by technology

At present, the water hammer pressure sensor used on the aerospace liquid rocket engine test bench mainly adopts the steady-state pressure static on-site calibration, but in practical applications, the water hammer pressure sensor is mainly subject to transient impact and is greatly affected by the field test environment; Directly using static calibration coefficients for dynamic data processing and analysis cannot truly reflect the dynamic characteristics of the water hammer pressure sensor, which in turn greatly affects the accuracy of water hammer pressure measurement data

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