Concave-convex annular spacing sealing structure with flanges

Abstract

The invention discloses a concave-convex annular sealing structure with flanges, which comprises two pipe ends, two flanges sleeved on the pipe ends, sealing pieces and fasteners, wherein each flange comprises an inner end surface and a through hole. The sealing structure is characterized in that an inner concave part is arranged on the inner end surface of each flange in a position near the periphery of the through hole; the sealing pieces are two composite linings arranged in the inner concave parts and embedded in the pipe ends, and can be in tight contact with each other after the flanges are fastened through the fasteners; and at least one convex sealing ring is arranged on one of the contact surfaces of the sealing pieces. The sealing structure has the benefit effects that the concentricity of connected pipelines can be guaranteed; the composite linings can not protrude radially due to over extrusion; and the sealing effect can be achieved on the condition that no shear stress is generated.

Description

technical field [0001] The invention relates to a pipeline structure, more specifically to a position-limiting and sealing pipeline structure. Background technique [0002] In petroleum and chemical equipment and pipelines, due to the requirements of the production process, or to facilitate its manufacture, transportation and installation, detachable connection structures are usually used. Common detachable structures include flange connection, thread connection and socket connection, and flange connection has better strength and tightness, and is applicable to a wide range of sizes, and can be applied to equipment and pipelines, so it is the most widely used . [0003] At present, the flange sealing structure of composite pipelines in my country is still commonly used to add sealing gaskets, or to use elastic linings to directly flang to the flange end face to achieve the purpose of sealing. Since the pipes are positioned and linked by the flange holes, and the flanges ar...

AI Technical Summary

Problems solved by technology

Since the pipes are positioned and connected by the flange holes, and the flanges are fixed by bolts, it is difficult to ensure the concentricity of the pipes with the above-mentioned sealing structure; Under the action of the action, the gasket between the sealing surfaces is compressed

The pressure applied on the unit area must reach a certain value to make the gasket deformed and compacted, and the micro-gap formed by machining on the sealing surface is filled to form the initial sealing condition, but there will also be excessive sealing. Squeeze the surface of the flange, so that the elastic sealing surface of the flange generates shear stress, so that the composite lining protrudes radially toward the pipeline, which increases the resistance of the pipeline and generates eddy currents, so that the protruding part is quickly worn through, resulting in the entire pipeline The service life of the pipeline is greatly reduced

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