Sludge washing gun with multi-nozzle structure

Abstract

The invention provides a sludge washing gun with a multi-nozzle structure, belongs to the technical field of rigid sludge gun washing for a secondary side tube plate of a steam generator, and specifically relates to a rigid sludge gun nozzle of a steam generator with triangularly arranged heat transfer tubes. Different nozzle blocks are driven by a transmission shaft on which a straight gear and a bevel gear are mounted, so that rotary outputs of a plurality of nozzle blocks at different angles are realized; the sludge washing gun with the multi-nozzle structure comprises nozzles, a rotating sleeve, a transmission gear, a rotary driving motor, a rotary output shaft, a rotary motor housing, a high-pressure housing, a seal ring and the like. High-pressure water passes through a water inlet which is formed in a side end face of the high-pressure housing and connected with each nozzle through a water tank; the rotary driving motor is mounted in the airtight space of the high-pressure housing and sealed by using a lip-type seal ring of a rotating shaft, the nozzles are mounted on the straight-section nozzle block and the inclined nozzle block by virtue of screw threads, and the shells are mounted to cover the nozzles and each drive element and fixed on the high-pressure housing by virtue of screws.

Description

technical field [0001] The invention belongs to the technical field of rigid sludge gun flushing of a secondary side tube plate of a steam generator, and in particular relates to a rigid sludge gun nozzle of a steam generator with triangular arrangement of heat transfer tubes. Background technique [0002] Due to the serious consequences of sludge deposition on steam generators, the removal of sludge has become an important part of the maintenance management of steam generators in nuclear power plants. In order to better solve the problem of sludge deposition, regular sludge flushing is required. [0003] In some active nuclear power plants, the heat transfer tubes of some steam generators are arranged in a triangle, with a special structure. There is a vertically arranged partition on the 0°-180° central pipe gallery, which divides the secondary side of the steam generator into two. Flushing should be done on one side. The heat transfer tubes of the steam generator are ar...

AI Technical Summary

Problems solved by technology

Conventional cantilever flushing guns can only flush in a single direction, and with balanced nozzles, the flushing efficiency is low; in addition, the size of the steam generator is large, the available space for the hand hole is small, and the cantilever structure of the cantilever flushing gun is too long, which may easily cause the Part of the deflection increases, and the tubes cannot be aligned normally; in addition, in order to reduce the dead zone of the tube sheet flushing on the secondary side of the steam generator, flushing guns with multiple angles must be installed to carry out the flushing work separately, which not only increases the workload, but also takes up a lot of time, but also increased the radiation dose of the operator

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