Auxiliary sealing structure for spherical joint

Abstract

The invention provides an auxiliary sealing structure for a spherical joint. The auxiliary sealing structure comprises a screwing-in joint, a spherical pipe joint and a gland nut, wherein an external spherical head of the spherical pipe joint is inserted into an inner tapered hole of the screwing-in joint; the gland nut is sleeved in an unthreaded hole of the spherical pipe joint; internal threads of the gland nut are matched and tightened with external threads of the screwing-in joint; a spherical surface of the external spherical head and the inner tapered hole form a linear annular contact sealing belt; an annular sealing gasket is mounted between an inner end face of the gland nut and an outer end face of the spherical pipe joint. The auxiliary sealing structure for the spherical joint has the advantages and positive effects that an O-shaped sealing ring is additionally arranged in a meshing area of the external threads of the screwing-in joint and the internal threads of the gland nut, and the annular sealing gasket is additionally arranged between the inner end face of the gland nut and the outer end face of the spherical pipe joint, so that the sealing effect of the spherical pipe joint is promoted, and the leakage problem of the spherical pipe joint is solved.

Description

Technical field [0001] The invention belongs to the technical field of spherical joint structure sealing, and in particular relates to an auxiliary sealing structure of a spherical joint. Background technique [0002] The spherical joint sealing structure is a commonly used sealing form in low-pressure pipelines of diesel engines. The sealing form has simple structure, small space occupation, easy centering adjustment, and convenient assembly, and can be applied to environments that use different media such as media systems, cooling systems, and lubrication systems. However, the leakage problem of spherical joints is also a long-term failure phenomenon of diesel engines in use, and has a certain generality. [0003] The linear ring-shaped contact belt formed by the spherical surface of the spherical pipe joint and the screw-in structure cone, that is, the sealing belt, has an unstable sealing effect, especially when the working environment of the high-power diesel engine is bad, a...

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Problems solved by technology

[0003] The linear annular contact zone formed by the spherical surface of the spherical pipe joint and the taper hole of the screw-in structure, that is, the sealing belt, has an unstable sealing effect, especially when the working environment of a high-power diesel engine is harsh and the vibration of the whole machine is large. Leakage of the medium occurs, polluting the power cabin, and even causing serious consequences such as fire

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