Oil pipe filter for steam turbine and gas turbine

Abstract

The invention discloses a filter for an oil pipeline of a steam turbine or a gas turbine, which comprises a shell and a filter element arranged in the shell, wherein the waist position of the shell is provided with an oil inlet hole and an oil outlet hole; the filter element is provided with a frame and a filter screen fixed on the frame, and the frame comprises a frame body and a bottom board; the filter screen is of a cylindrical shape, is molded by the wrapping of sheet screen cloth, and is provided with upper and lower end circumferences and a longitudinal seam, and the waist position of the cylindrical filter screen is provided with an oil inlet hole which corresponds to the oil inlet hole of the shell; the circumferential seam of the filter screen is folded and flanged, and is clamped, fastened and connected by an edge covering strip; the periphery of the upper end part of the filter screen is flanged and is tightly compressed by a pressure ring, and then the pressure ring is fastened on the frame body through a screw; the periphery of the lower end part of the filter screen is flanged and is tightly compressed by the bottom board, and then the bottom board is fastened on the frame body through a screw; and a side opening of the oil inlet hole of the filter screen is flanged and lapped on the hole wall of the oil inlet hole of the shell and is connected with the hole wall through resistance welding. The filter can ensure that no gap exists between filter screen cloth and the filter screen, has a simple structure and low manufacturing cost, is convenient to wash the filter element, and can replace the filter screen.

Description

technical field [0001] The invention relates to lubricating oil pipelines of steam turbines and gas turbines, in particular to filters for the lubricating oil pipelines. Background technique [0002] The lubrication systems of steam turbines and gas turbines are closed-circuit circulation systems, and filters are installed in the lubricating oil pipelines to filter and regularly remove impurities in the lubricating oil. [0003] The filter element of the filter is in the shape of a cylinder, consisting of a skeleton and two layers of filter cloth (24 mesh and 150 mesh). There are seams around the garden, and the waist of the cylindrical filter screen has oil inlet holes. [0004] In the past, the periphery of the two ends of the filter screen and the periphery of the oil inlet hole were brazed on the frame, which brought two unfavorable consequences: one is that part of the filter holes of the filter cloth are blocked by brazing, effectively filtering The area is reduced; ...

AI Technical Summary

Problems solved by technology

[0004] In the past, the periphery of the two ends of the filter screen and the periphery of the oil inlet hole were brazed on the frame, which brought two unfavorable consequences: one is that part of the filter holes of the filter cloth are blocked by brazing, effectively filtering The area is reduced; the second is that when the filter screen is damaged, the entire filter element must be replaced, resulting in an increase in the operating cost of the power plant

[0005] In addition, the longitudinal and circumferential seams of the filter screen are tightly connected by multiple spring sheets (the technical requirements of Mitsubishi Corporation of Japan). Since the circumferential seams are long, the elastic force of the spring sheets acts on the seams. Uneven, forming leakage points, it is difficult to ensure effective sealing, lubricating oil may flow out from these leakage points, causing a short circuit, entering the circulation without filtering, and bringing impurities into the lubrication system

Moreover, there are a total of six spring pieces on the screen frame, and it is troublesome for the power plant to clean the screen.

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