Fixed guide vane without welding groove structures at water inlet and outlet edges and

Abstract

The invention provides a fixed guide vane without welding groove structures at water inlet and outlet edges and an assembling and welding process. Welding grooves are not machined in the two ends of both the water inlet edge and the water outlet edge of the fixed guide vane; a U-shaped groove is machined in the middle area, except for the water inlet edge and the water outlet edge, of the fixed guide vane; and the middle groove section of the fixed guide vane is in gradually varied smooth transition with the planes of the two ends of the water inlet and outlet edges in the form of a turning tool circle R. When the fixed guide vane and a seat ring board are assembled, a welding shrinkage allowance is not additionally reserved; after the fixed guide vane and the seat ring board are assembled, the end part platform area of the fixed guide vane and the seat ring board are fixed through corner welding; during welding, a groove welding seam at the middle part of the fixed guide vane is welded first; after the welding is finished, welding grooves are gouged in platforms at the two ends of the fixed guide vane through carbon arc air gouging; and finally, welding seams at the end parts of both the water inlet edge and the water outlet edge of the fixed guide vane are welded. According to the fixed guide vane without the welding groove structures at the water inlet and outlet edges and the assembling and welding process, the dimensional tolerance of an opening of a seat ring after the welding can be accurately controlled, and the manufacturing quality of the seat ring product can beimproved.

Description

technical field [0001] The invention relates to a fixed guide vane with no welding groove structure at the water inlet and outlet and a welding process method. Background technique [0002] The opening size tolerance of the seat ring of the pumped storage unit after welding is very strict. Generally, the half-opening tolerance is only ±2mm. Measures such as installing welding support bars and adjusting the welding sequence during the assembly and welding process cannot effectively control the opening size tolerance of the seat ring after welding. , It is often processed in the subsequent order by surfacing welding and relief grinding on the overcurrent surface of the ring plate, which increases the workload of rework and the manufacturing cycle. [0003] The disadvantages of using traditional technology and welding methods are: [0004] 1) When assembling the fixed guide vane and the ring plate of the seat ring, it is necessary for the craftsman to provide the reserved weld...

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Problems solved by technology

[0005] 2) Since the welds between the ring plate of the seat ring and the fixed guide vanes require root cleaning and penetration, and are also affected by the flatness of the ring plate of the seat ring itself and the difference in the assembly clearance between the ring plate and the fixed guide vanes, the opening circumference of the seat ring The welding shrinkage and opening size deviation of each point is relatively large

[0007] 4) When assembling the fixed guide vane and the ring plate of the seat ring, since the guide vane and the plane of the ring plate are in contact with the blunt edge of the groove, it is difficult to align the tangent point of the inner and outer circles with the marking line, and the assembly efficiency is low

[0008] It can be seen from the above points that it is not only difficult to accurately give the reserved welding shrinkage by using the traditional process of fixing the guide vane and welding method, but also wastes a lot of supporting tie bars in the manufacturing process, and the seat ring is opened after welding. The size deviation is large, so it is necessary to develop a new structure fixed guide vane and a welding process method that is easier to install and weld and more conducive to accurately controlling the tolerance of the opening size after ring welding of the seat ring

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