Double-ball compensating joint

Abstract

The invention discloses a double-ball compensating joint comprising a sphere casing and a sphere extension tube which are mutually sheathed. The sphere casing and the sphere extension tube extend with a spherical casing sphere and an extension tube spherical surface in opposite direction; the spherical casing and the sphere extension tube are mutually matched and connected with a spherical shell by a connecting piece; one section of the inner cavity of each spherical shell is in sphere matched with the corresponding casing sphere and the extension tube spherical surface; the sphere extension tube is arranged in the inner cavity of the sphere casing; a seal ring 2 is arranged between the sphere extension tube and the sphere casing; and the sphere extension tube is provided with an anti-dropping chuck connected with the sphere casing. The double-ball compensating joint not only ensures that the sphere extension tube and the sphere casing can move relative to the spherical shell, and realizes large deflection; the sphere extension tube and the sphere casing can move relative to obtain axial compensation effect. The invention not only has good sealing effect, improves deflection and can realize angle compensation and axial compensation.

Description

technical field [0001] The invention relates to a pipe joint, and in particular to a double-ball compensation joint. Background technique [0002] At present, various pipeline systems such as: gas pipelines, water supply pipelines, oil pipelines, etc. are widely used in people's daily life. Pipeline deflection and thermal expansion and contraction caused by complex terrain, seasonal changes, and large temperature differences between day and night will have a serious impact on the pipeline. The general solution is to set compensation joints during the pipeline laying process to compensate for the axis of the pipeline Displacement and deflection angle eccentricity, the spherical compensation joint is a joint with large deflection, such as a spherical compensation joint disclosed in the patent No. ZL 02264646. Can do angle compensation, but can not do axial compensation. Contents of the invention [0003] The object of the present invention is to provide a double-ball compe...

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Problems solved by technology

[0002] At present, various pipeline systems such as: gas pipelines, water supply pipelines, oil pipelines, etc. are widely used in people's daily life. Pipeline deflection and thermal expansion and contraction caused by complex terrain, seasonal changes, and large temperature differences between day and night will have a serious impact on the pipeline. The general solution is to set compensation joints during the pipeline laying process to compensate for the axis of the pipeline Displacement and deflection angle eccentricity, the spherical compensation joint is a joint with large deflection, such as a spherical compensation joint disclosed in the patent No. ZL 02264646. Disadvantages of being able to do angle compensation but not being able to do axial compensation

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