Measuring structure for steam pressure of inner cylinder body of dual-layer cylinder

Abstract

The invention belongs to the technical field of steam turbine equipment and particularly relates to a measuring structure for steam pressure of an inner cylinder body of a dual-layer cylinder. The measuring structure comprises a pipe connector, a lead pipe and a bolt pipe connector; one end of the pipe connector is welded to a through hole boss of the inner cylinder body, and the other end of thepipe connector is welded to the low end of the lead pipe; the bolt pipe connector is installed at a bolt hole of a steam inlet flange of the inner cylinder body; after the bolt pipe connector is installed, one end of the bolt pipe connector is welded to the top end of the lead pipe, and a washer and a fastening nut are installed at the other end of the bolt pipe connector after the steam inlet companion flange is assembled; and the bolt pipe connector is welded to an external pressure measuring pipe after being installed. By means of the measuring structure, a pressure lead device that the high-pressure steam in the inner cylinder body can be led out without penetrating through an outer cylinder body of a dual-layer cylinder steam turbine is achieved, a series of problems about installation, maintenance, steam leakage and the like of a traditional pressure lead device caused by penetrating through of the outer cylinder body are avoided, problems about overhauling are solved, the steamleakage problem caused by frequent assembly and disassembly of the pressure lead device is avoided at the same time, sealing reliability is greatly improved, and the measuring device is reasonable indesign, safe and reliable.

Description

Technical field: [0001] The invention belongs to the technical field of steam turbine equipment, and in particular relates to a measuring structure for steam pressure of a cylinder in a double-layer cylinder. Background technique: [0002] In the design of high-temperature and high-pressure steam turbines, online monitoring of the steam parameters (pressure, temperature) of the steam turbine operation is required, both in terms of efficiency evaluation and safe operation of the steam turbine. The pressure device penetrates the sandwich cavity of the inner and outer cylinders, and the sealing of the cylinder must be ensured, so the structural design is particularly complicated. The traditional pressure induction structure is complex in design and difficult to assemble. When the outer cylinder needs to be removed for inspection and maintenance, special tooling is required to disassemble and reassemble the pressure induction device first; during long-term operation, the relativ...

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Problems solved by technology

[0002] In the design of high-temperature and high-pressure steam turbines, online monitoring of the steam parameters (pressure, temperature) of the steam turbine operation is required, both in terms of efficiency evaluation and safe operation of the steam turbine. The pressure device penetrates the sandwich cavity of the inner and outer cylinders, and the sealing of the cylinder must be ensured, and its structural design is particularly complicated.

The traditional pressure induction structure is complex in design and difficult to assemble. When the outer cylinder needs to be removed for inspection and maintenance, special tooling is required to disassemble and reassemble the pressure induction device first; during long-term operation, the relative expansion of the inner and outer cylinders has a negative impact on the pressure induction device ( Tensile / compressive) alternating stress will also have a great impact on the sealing performance of the blow-by structure

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