Leaking water recovering and damage preventing guide vane mechanism for mixed-flow water turbine

Abstract

The invention discloses a leaking water-recovering and damage-preventing guide vane mechanism for a mixed-flow water turbine. The structure of the leaking water-recovering and damage-preventing guidevane mechanism for the mixed-flow water turbine comprises a top cover, guide vanes, an utilization device, an exhaust water pipe, a spinning roller, a sealer, a guide bearing and a main shaft; the topcover is positioned right above the exhaust water pipe; a plurality of the guide vanes are arranged and surround the outer circle of the outer surface of the exhaust water pipe; the utilization device is mounted inside the exhaust water pipe; the spinning roller is positioned at the middle end inside the exhaust water pipe; the sealer is positioned inside the guide vanes; a connecting rotating mechanism is arranged structurally, and a water accumulating chamber of the utilization device is sealed through a baffle plate under the coordination of a moving mechanism and a pushing mechanism, so that the water drained inwards by the guide vanes during working is prevented from flowing into the water accumulating chamber; when a machine set stops working and water leaks, the pushing mechanism is reset, so that the water accumulating chamber of the utilization device is in an expanded state, the water flows into the water accumulating chamber, and over-current parts in the machine set are prevented from being damaged; and a quantitative drainage mechanism is also arranged for draining the water accumulated in the water accumulating chamber, so that the power loss caused by the overflow of the water and the restarting of the machine set is prevented.

Description

technical field [0001] The invention relates to the field of hydroelectric power generation, in particular to a guide vane mechanism for Francis water turbines that recovers leaking water and prevents damage. Background technique [0002] In the era of advocating new energy, the conversion of water into mechanical energy is widely used in hydropower generation. Hydropower uses hydraulic turbines to convert electrical energy. Among them, Francis turbines operate stably and have high efficiency. The most extensive type of water turbine, the main components include water guide mechanism, runner, main shaft and so on. [0003] Due to the long service life of some water conservancy units, some guide vane mechanism equipment in the water guide mechanism has been worn out, causing the gap between the guide vanes to increase. When the vane stops working and the seal is not tight, there is a gap, which will generate gap jet flow, and the sudden change of water pressure will form gap...

AI Technical Summary

Problems solved by technology

[0003] Due to the long service life of some water conservancy units, some guide vane mechanism equipment in the water guide mechanism has been worn out, causing the gap between the guide vanes to increase. When the vane stops working and the seal is not tight, there is a gap, which will generate gap jet flow, and the sudden change of water pressure will form gap cavitation, which will damage the passing parts. , when the unit is operating at a low speed, it will have a serious impact on the operation of the thrust bearing, resulting in power loss

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