Opening and closing control method of a barrel valve

Abstract

The invention relates to an opening-closing control method for a barrel valve. The opening-closing control method comprises the following steps: S1 in a barrel valve opening process, firstly performing delay flat pressing operation on the barrel valve and then adopting a proportional solenoid valve to perform synchronously regulate in a process of lifting the barrel valve to a full opening state, and finally keeping the barrel valve at the full opening position; S2 in a barrel valve closing process, firstly performing delay flat pressing operation on the barrel valve, then adopting the proportional solenoid valve to perform synchronously regulate in a process of dropping the barrel valve to a full closing state, and finally keeping the barrel valve at the full closing position. In the barrel valve opening and closing processes, the operation is stable, displacement deviation (the maximal deviation within 3mm) of each servomotor is relatively small, the regulating times for the proportional solenoid valve are reduced, the regulating effect is relatively good, and the lower cavity pressure of the servomotor is kept balanced.

Description

technical field [0001] The invention relates to the field of cylinder valve control of a hydropower station, in particular to an opening and closing control method of a cylinder valve. Background technique [0002] At present, in order to prevent the oil hammer effect of the oil circuit system in the initial stage of falling and opening of the barrel valve of the power station, the oil separator is closed when it is close to the fully open (97.5%) and fully closed positions (2.5%). Cut off the main oil supply circuit of the cylinder valve servomotor, open the hydraulic proportional solenoid valve to the maximum opening, and make the cylinder valve reach the fully open or fully closed position. After reaching the fully closed position, after a delay of 10 seconds, move the proportional solenoid valve spool to the middle position. After reaching the fully open position, continue to open the hydraulic proportional solenoid valve to the maximum opening to keep the cylinder valv...

AI Technical Summary

Problems solved by technology

[0004] Because the six servomotors connected to the cylinder valve are not synchronized, there is a large deviation in the displacement of the servomotor (the displacement deviation of adjacent servomotors exceeds 12mm and the alarm is stopped), the cylinder tilts, and in serious cases, it will be stuck in the flow channel of the turbine or In the cavity of the top cover, there is often a phenomenon that the cylinder valve is stuck, and the deviation of the servomotor exceeds 12mm, alarms and stops

When the barrel valve is issued, the servomotor of the barrel valve has a large deviation, and the pressure in the lower chamber of each servomotor is unbalanced. Some have excessive pressure (over 10MPa, rated 6.3MPa), and some have a small pressure or even close to 0MPa.

[0005] After the barrel valve is fully opened and fully closed, the structure is not completely balanced, resulting in structural stress in the barrel valve. At the same time, there is a certain internal leakage in the hydraulic system, resulting in inconsistent pressure in the lower chamber of the servomotor

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