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US 5,344,164 AGranted
Mechanical seals
AssigneeAES Engineering Ltd.
InventorsChristopher J. Carmody, Christopher J. Rea
Life of this patent
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AssigneeAES Engineering Ltd.
InventorsChristopher J. Carmody, Christopher J. Rea
Estimating the term…
The invention provides a cartridge-mounted mechanical seal in which a set of bellows acts against the rotary component to urge its face into mating contact with the stationary component face, and wherein the stationary component is mounted in the seal so as to allow it a degree of pivotal movement, in use, relative to the stationary parts of an item of equipment in which the seal is used, about an axis perpendicular to the longitudinal axis of the seal, hence maintaining the stationary and rotary components substantially in alignment despite any out-of-squareness in the equipment. The invention also provides a self-aligning stationary unit which might be used in such a seal, in which unit a stationary seal face is pivotally mounted about one or more primary pivot pins set in a pivot ring, the pivot ring in turn being pivotally mounted about one or more secondary pivot pins set in a gland plate which, in use of a seal incorporating the unit in an item of equipment, will remain fixed in position relative to stationary parts of the equipment, the primary pivot pins being located in slots provided in the stationary seal face.
A cartridge-mounted mechanical seal comprising a sleeve on which are mounted a rotary and a stationary component, having adjacent faces, and bellows acting against the rotary component to urge the rotary component face into mating contact with the stationary component face, wherein the stationary component of the seal is pivotally mounted about a first axis perpendicular to the longitudinal axis of the seal on at least one primary pivot pin, set in a pivot ring which is in turn pivotally mounted about a second axis perpendicular to the longitudinal axis of the seal with respect to a fixed part of the seal which, in use, remains fixed in equipment in which the seal is used, the arrangement allowing a degree of pivotal movement, when the seal is in use, of the stationary component relative to the pivot ring about the at least one primary pivot and a degree of pivotal movement of the pivot ring relative to the stationary parts of the item of equipment and hence maintaining the stationary and rotary components of the seal substantially in alignment despite any out-of-squareness in the equipment, wherein the said at least one primary pivot is located in at least one respective slot provided in the stationary component and enters the slot in a radial direction, at least part of the pivot ring encircling at least part of the outside diameter of the stationary component.
A self-aligning-stationary unit for use in a cartridge-mounted mechanical seal, the unit comprising a stationary seal face pivotally mounted about at least one primary pivot pin set in a pivot ring, the pivot ring in turn being pivotally mounted with respect to a gland plate which, in use of a seal incorporating the unit in an item of equipment, will remain fixed in position relative to stationary parts of the equipment, wherein the at least one primary pivot pin is located in at least one respective slot provided in the stationary seal face and enters the slot in a radial direction, at least part of the pivot ring encircling at least part of the outside diameter of the stationary seal face.
A cartridge-mounted mechanical seal, comprising a sleeve on which is mounted a rotary and a stationary component, having adjacent faces, and bellows acting against the rotary component for urging the rotary component face into mating contact with the stationary component face, wherein the stationary component of the seal is pivotally mounted about a first axis perpendicular to the longitudinal axis of the seal on at least one primary pivot pin, set in a pivot ring which is in turn pivotally mounted about a second axis perpendicular to the longitudinal axis of the seal with respect to a fixed part of the seal which, in use, remains fixed in position relative to the stationary parts of an item of equipment in which the seal is used, the arrangement allowing a degree of pivotal movement, when the seal is in use, of the stationary component relative to the pivot ring about the at least one primary pivot pin and a degree of pivotal movement of the pivot ring relative to the stationary parts of the item of equipment and thereby maintaining the stationary and rotary components of the seal substantially in alignment despite any out-of-squareness in the equipment, wherein the arrangement of the stationary component and pivot ring, relative to the fixed part of the seal, is such that an O-ring sealing element is able to be accommodated, and held in position, in a cavity defined by the stationary component, the pivot ring and the fixed part of the seal, so that the sealing element acts to seal the join between the stationary component and the fixed part of the seal.
A self-aligning-stationary unit for use in a cartridge-mounted mechanical seal, the unit comprising a stationary seal face pivotally mounted about, at least one primary pivot pin set in a pivot ring, the pivot ring in turn being pivotally mounted with respect to a gland plate which, in use of a seal incorporating the unit in an item of equipment, will remain fixed in position relative to stationary parts of the equipment, wherein the arrangement of the stationary seal face and pivot ring, relative to the gland plate, is such that an O-ring sealing element is able to be accommodated, and held in position, in a cavity defined by the stationary seal face, the pivot ring and the gland plate, so that the sealing element acts to seal the join between the stationary seal face and the gland plate.
Dependencies are inferred from the claim text.