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US 2022/0018462 A1Published application
Stem Seals with Triangular Rings
AssigneeBaoyi Group Co. Ltd.
InventorsChangxiang Xu, Xiaozhong Zhang
Life of this patent
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AssigneeBaoyi Group Co. Ltd.
InventorsChangxiang Xu, Xiaozhong Zhang
Estimating the term…
A pressure-tight stem cylinder seal and a self-energizing stem shoulder seal matching the stem cylinder seal that both use an equilaterally triangular soft ring as their sealing element, wherein their designing rules are first, by means of wedging function of a hard gland coaxial with the stem cylinder, to convert their original axial tightening force 2f respectively into a radial compression force 4f/√3 of their soft ring 04 on the stem 02 cylinder and another radial compression force 2f of their soft ring 06 on the stem 02 shoulder and ensure that the two soft rings are so compressed from a great room to a small room as to be able to pass a pressure or stress exactly to each different direction, then to cut off their off-stem corners to give their cavities an opening or give each soft ring an axial compressing allowance, and last, by means of anti-extrusion metallic C-rings without axial resistance, to close each opening to provide a full support for the sealing deformation of their soft rings compressed in their cavities.
An equilaterally triangular ring seal for moving rod or shaft cylinders (or called stem cylinder seals with triangular rings), including a single turn anti-extrusion ring (05b), a triangular soft ring (04) truncated at its off-stem corner and a hard metallic gland (03a) that are successively fitted over the cylindrical stem or shaft (02) and, as the triangular soft ring is compressed on the stem cylinder and in a 120° conical seat of stem housings (01) at the same time by a 120° inner conical surface of the hard metallic gland, form a triangular ring-containing cavity consisting of the inner conical surface of the hard metallic gland, the stem cylinder and the conical surface of the seat and having an opening caused by cutting off the cavity's off-stem corner to enable the triangular soft ring therein to be fully compressed, wherein the single turn anti-extrusion ring made of either a bent turn of soft metallic wire with enough length and cross-sectional diameter or a molded turn of nonmetallic material with enough strength is used to resist the extrusion of the triangular soft ring through the gap between the stem and the stem housing, a sliding fit with a small enough clearance is used to resist the extrusion of the triangular soft ring through the gap between the gland and the stem, and an arc-shaped anti-extrusion metallic C-ring (05a) attached to the truncated corner of the triangular soft ring is used to resist the extrusion of the triangular soft ring through the opening of the cavity.
An equilaterally triangular ring seal for moving rod or shaft shoulders (or called stem shoulder seals with triangular rings), including a triangular soft ring (06) truncated at its off-stem corner and a hard metallic gland (07) that are fitted together over the spherical stem shoulder (02) by their 60° conical surfaces and, as the triangular soft ring is compressed on the stem housing (01) by the spherical stem shoulder and the hard metallic gland, form a triangular ring-containing cavity consisting of the inner conical surface of the hard metallic gland, the spherical surface of the stem shoulder and the flat surface of the stem housing and having an opening caused by cutting off the cavity's off-stem corner to enable the triangular soft ring therein to be fully compressed, wherein a contact fit without clearance between the stem shoulder and the stem housing as well as the hard metallic gland is used to resist the extrusion of the triangular soft ring at two non-truncated corners, and an arc-shaped anti-extrusion metallic C-ring (05a) attached to the truncated corner of the triangular soft ring is used to resist the extrusion of the triangular soft ring through the opening of the cavity.
An equilaterally triangular ring seal for moving rod or shaft cylinders (or called stem cylinder seals with triangular rings), including a single turn anti-extrusion ring (05b), a triangular soft ring (04) truncated at its off-stem corner and a hard metallic gland (03a) that are successively fitted over the cylindrical stem or shaft (02) and, as the triangular soft ring is compressed on the stem cylinder and in a 120° conical seat of stem housings (01) at the same time by a 120° inner conical surface of the hard metallic gland, form a triangular ring-containing cavity consisting of the inner conical surface of the hard metallic gland, the stem cylinder and the conical surface of the seat and having an opening caused by cutting off the cavity's off-stem corner to enable the triangular soft ring therein to be fully compressed, wherein the single turn anti-extrusion ring made of either a bent turn of soft metallic wire with enough length and cross-sectional diameter or a molded turn of nonmetallic material with enough strength is used to resist the extrusion of the triangular soft ring through the gap between the stem and the stem housing, a sliding fit with a small enough clearance is used to resist the extrusion of the triangular soft ring through the gap between the gland and the stem, and an anti-extrusion metallic coiled ring (FIG. 6) or an anti-extrusion close wound coil spring ring (FIG. 7) attached to the truncated corner of the triangular soft ring is used to resist the extrusion of the triangular soft ring through the opening of the cavity.
An equilaterally triangular ring seal for moving rod or shaft shoulders (or called stem shoulder seals with triangular rings), including a triangular soft ring (06) truncated at its off-stem corner and a hard metallic gland (07) that are fitted together over the spherical stem shoulder (02) by their 60° conical surfaces and, as the triangular soft ring is compressed on the stem housing (01) by the spherical stem shoulder and the hard metallic gland, form a triangular ring-containing cavity consisting of the inner conical surface of the hard metallic gland, the spherical surface of the stem shoulder and the flat surface of the stem housing and having an opening caused by cutting off the cavity's off-stem corner to enable the triangular soft ring therein to be fully compressed, wherein a contact fit without clearance between the stem shoulder and the stem housing as well as the hard metallic gland is used to resist the extrusion of the triangular soft ring at two non-truncated corners, and an anti-extrusion metallic coiled ring (FIG. 6) or an anti-extrusion close wound coil spring ring (FIG. 7) attached to the truncated corner of the triangular soft ring is used to resist the extrusion of the triangular soft ring through the opening of the cavity.
Dependencies are inferred from the claim text.