Adjustable mold of spiral case and seat ring of micro hydraulic turbine

Abstract

The invention relates to an adjustable mold of a spiral case and a seat ring of a micro hydraulic turbine, which is characterized by comprising a spiral case and a seat ring, wherein the spiral case adopts a two-half structure formed by combining an upper part and a lower part, the seat ring comprises an upper ring and a lower ring, the upper ring and the lower ring are respectively arranged in the middle of the spiral case, the peripheries of the upper ring and the lower ring are both provided with a circle of stepped through holes in corresponding positions, a guide vane is arranged between each pair of through holes, the upper side and the lower side of each guide vane are both provided with a pivot shaft with threads, and the guide vanes are fastened with the pivot shafts of the guide vanes through nuts after being adjusted into the designed mounting angles. The guide vanes of the adjustable mold can be designed as movable guide vanes. Therefore, the mounting angles of the guide vanes can be changed within a certain scope during the casting process, so that one runner is applicable to different head sections without greatly influencing the efficiency, thereby reducing the manufacturing costs of the molds of overflow components such as runners, seat rings and the like during the production of household micro hydraulic turbines.

Description

technical field [0001] The invention relates to a mould, in particular to an adjustable mould, which can adapt to different water heads (the water head is the mechanical energy possessed by water per unit mass). Background technique [0002] At present, micro-hydropower, as a typical distributed power generation method, not only solves the power consumption problem caused by the inability of the traditional large power grid in mountainous areas of our country, but also is an economical, effective and green power generation method. However, although micro-hydropower resources are abundant, the water head conditions vary widely, and the users of micro-hydroelectric turbines are generally those in remote and economically backward areas, and the prices they can afford are very low. For the manufacturers of micro-turbine, due to the consideration of production cost, it is impossible for the manufacturers of large and medium-sized water turbines to devote independent scientific re...

AI Technical Summary

Problems solved by technology

The volute and fixed guide vane of micro and small turbines are generally integrally cast, the placement angle of the fixed guide vane is fixed, and the outlet of the fixed guide vane is designed as a blunt airfoil, so not only cannot adapt to the widely varying water head conditions, but also in the fixed guide vane The hydraulic loss at the tail of the guide vane is relatively large, resulting in many problems such as low efficiency of the whole machine, poor operation stability and reliability, etc.

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