A Processing Technology of Split-half Volute Case of Francis Turbine

Abstract

The invention discloses a mixed flow water turbine split-half volute machining technology. Sufficient allowance is reserved for machining a split-half flange plane for a volute split-half flange, various connecting holes are drilled at the same time, then a joint face flange is connected into a whole, and various volute segments, a mandoor and a volute water inlet taper pipe are welded to a base ring to be integrally placed on a platform, the X-Y line is aligned, a workpiece is leveled, a split-half flange assembling and welding line is divided, and a mark is made; a technology angle iron lining is welded; after the split-half flange is inserted and welded and shock excitation aging is conducted, a technology connecting plate and a technology lining can be detached; meanwhile, an anti-deformation supporting rod is welded, the volute split-half flange is dismounted, a split-half flange plane and a sealing groove are machined in a numerical control boring and milling machine, the allowance at the connecting position of the split-half flange inner side bevel and a volute is divided in a matched manner, grinding is conducted for smoothness, volute inner side connection is smooth and flat, and finally, the split-half flange is connected into a whole. By adoption of the mixed flow water turbine split-half volute machining technology, split half flange and volute deformation during welding can be effectively controlled, power station match working and welding processes are omitted, the installing efficiency and the installing quality are improved, and cost is reduced.

Description

technical field [0001] The invention relates to a processing technique of a split and half volute, in particular to a processing technique of a split and half volute of a Francis turbine. Background technique [0002] At present, for the volute of a Francis turbine, the conventional design structure is to divide the volute into several sections, usually by welding the volute from a certain section to the end of the volute and the closed drainage cavity as a whole in the seat ring. The other volute sections are pre-mounted in the factory, the welding grooves of each volute section are made separately, and the alignment marks are marked. Then, when transported to the power station for installation, they are welded on the seat ring to form the volute as a whole; When the power station is installed, the assembly size of each volute section has a large error due to deformation, and it is a waste of manpower, material resources and installation time in the power station assembly, ...

AI Technical Summary

Problems solved by technology

[0002] At present, for the volute of the Francis turbine, the conventional design structure is to divide the volute into several sections, and usually weld the volute from a section to the end of the volute and seal the drainage cavity as one in the seat ring. On the other hand, each joint surface of the other volutes is pre-installed in the factory, and the welding grooves of each volute joint are made respectively, and the alignment marks are marked, and then they are welded on the seat ring to form a whole volute when they are transported to the power station for installation; When installed in the power station, the assembly size of each volute section has a large error due to deformation, and the assembly, welding and weld flaw detection in the power station waste manpower, material resources and installation time

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