Making and forming method for model of siphon type water outlet passage of large pump station

Abstract

The invention discloses a making and forming method for a model of a siphon type water outlet passage of a large pump station and belongs to the technical field of hydraulic engineering pump stations. The method is characterized in that the making and forming process of the siphon type water outlet passage is divided into the three main stages of framework forming, small segment forming and integral forming; a framework, with errors easy to control, of the siphon type water outlet passage is introduced to serve as the support of small segment forming and integral forming; the siphon type water outlet passage is divided into a plurality of small segments according to a drawing, and blanking is conducted according to expanded drawings of all the small segments; with the aid of the framework, all the small segments are formed and connected with the framework through spot welding, and integral forming is achieved by splicing segment by segment; and the siphon type water outlet passage obtained after integral forming is tested and trimmed with a three-dimension scanning technique. According to the making method for the model of the siphon type water outlet passage, a series of effective error control measures are adopted, so that the making and forming precision of the model of the siphon type water outlet passage is ensured, and necessary conditions are provided for improving the quality of a performance test of a model of a pump device.

Description

technical field [0001] The invention belongs to the technical field of hydraulic engineering pumping stations, and in particular relates to a method for making and forming a siphon outlet channel model of a large pumping station, which is applied to the accurate manufacturing and forming of a siphon outlet channel model required for a model performance test of a pump device. Background technique [0002] The siphon outlet channel has the outstanding advantages of excellent hydraulic performance and simple and reliable shut-off method, and the siphon outlet channel is widely used in large-scale low-lift vertical pump devices. In order to test the hydraulic performance of large-scale low-lift pumps, the relevant specifications require that the model performance test of pumps must be carried out before the construction of large-scale low-head pumps. The siphon outlet flow channel is composed of an inlet section, a straight section, a hump section and a descending section. It is...

AI Technical Summary

Problems solved by technology

Due to the rough operation process of drawing splitting, lofting and blanking, block forming and overall splicing in the existing method, and the lack of effective measures to control errors, the error of the siphon outlet flow channel model produced is relatively large, which is far from meeting the high requirements. Requirements for model performance test of precision pump device

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