Anti-blocking apparatus for piezometer tube of water turbine

Abstract

The invention provides an anti-blocking apparatus for a piezometer tube. The anti-blocking apparatus comprises a piezometer tube, a branch piezometer tube, a pressure measuring device and a flushing device, wherein the pressure measuring device and the flushing device are respectively arranged on the branch piezometer tube, the pressure measuring device comprises a pressure gage, the flushing device comprises a branch flushing pipe and a valve installed on the branch flushing pipe. In a measuring state, the valve on the branch flushing pipe is closed, and the pressure gage can measure pressure of water in the branch piezometer tube; in a dredging state, the valve on the branch flushing pipe is opened, and high pressure water is introduced into the branch flushing pipe and flushes the piezometer tube under the guidance of the branch flushing pipe so as to allow slush in the piezometer tube to be flushed out to prevent deposition of the slush. The anti-blocking apparatus provided by the invention has the advantages of simple structure and capacity of preventing blocking of the piezometer tube.

Description

technical field [0001] The invention relates to a pressure measuring tube of a water turbine, in particular to an anti-blocking device for the pressure measuring tube of a water turbine. Background technique [0002] The parameters of the turbine, including the net water head of the unit (the pressure at the inlet of the volute and the outlet of the draft tube are involved in the calculation), the flow rate of the unit (the differential pressure method of the volute) and the stability parameters of the unit—the pressure pulsation is passed through the piezometric tube (generally φ32 stainless steel pipe) measured and calculated. [0003] In actual engineering, the water flow in the piezometric tube is very small, especially after the unit is shut down, the water flow in the piezometric tube is still. Due to the deposition of sediment in the water, the piezometric tube will be blocked as time goes by. To clean up the silt, the silt in the piezometric tube can only be removed...

AI Technical Summary

Problems solved by technology

[0003]In actual engineering, the water flow in the piezometric tube is very small, especially after the unit is shut down, the water flow in the piezometric tube is still, due to the deposition of sediment in the water, with time The passage of time will lead to blockage of the piezometric tube, and the sediment cannot be cleaned during the non-overhaul period of the unit. The silt in the piezometric tube can only be removed when the unit is overhauled and the volute / draft tube is drained; the other On the one hand, the piezometric tube is long and generally has a tortuous direction. Once there is a lot of sediment, it is extremely difficult to remove the sediment, and sometimes the pipeline will be completely blocked, and the piezometric tube is completely buried in the concrete. After the piezometric tube is completely blocked, it cannot If it is replaced, it can only be discarded. The parameters corresponding to the measurement of the piezometer will never be obtained again during the entire cycle of the power plant (unless the concrete is blasted, the piezometer is re-arranged, and the concrete is re-poured), and the operating status of the unit cannot be known in time. The safe and stable operation of the unit brings hidden dangers

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