초록 ▼

A high pressure sealing arrangement of the type in which a rotor sealing ring end face generates a gas pressure with a stator sealing ring end face at a functional gap between a cylindrical portion of the seal housing and the stator sealing ring bridged by an O-ring of reduced hardness. The gap widt

A high pressure sealing arrangement of the type in which a rotor sealing ring end face generates a gas pressure with a stator sealing ring end face at a functional gap between a cylindrical portion of the seal housing and the stator sealing ring bridged by an O-ring of reduced hardness. The gap width is less than 0.4 mm and preferably less than 0.3 mm. The sealing O-ring additionally serve as a compensation or centering ring and has a material hardness which is greater than the extrusion threshold of this material through the gap and is less than a hardness of 90 Shore A according to German Industrial Standard DIN 53505. Preferably the hardness of the O-ring is less than 80 Shore A under this Standard.

대표청구항 ▼

A gas-pressure contactless shaft-sealing assembly, comprising: a sealing housing surrounding an axis; a shaft extending along said axis and surrounded by said housing, said shaft being rotatable relative to said housing, said sealing housing being formed with a cylindrical portion at a shaft side of

A gas-pressure contactless shaft-sealing assembly, comprising: a sealing housing surrounding an axis; a shaft extending along said axis and surrounded by said housing, said shaft being rotatable relative to said housing, said sealing housing being formed with a cylindrical portion at a shaft side of said housing coaxially surrounding said shaft; a stator sealing ring extending around and axially overlapping said cylindrical portion, mounted on said housing and having an end face defining one of a pair of sealing-gap-defining faces and composed of a hard sealing material of high thermal conductivity, high hardness and high modulus of elasticity, said stator sealing ring defining with said cylindrical portion and around said cylindrical portion a functional annular gap, said stator sealing ring being movable axially on said cylindrical portion; an O-ring composed of a material selected from the group which consists of rubber and plastic bridging between said stator sealing ring and said cylindrical portion and axially sealing said functional annular gap; a rotor sealing ring mounted on said shaft, rotatably entrained by said shaft and formed with an end face juxtaposed with said end face of said stator sealing ring defining another of said pair of sealing-gap-defining faces and composed of a hard sealing material of high thermal conductivity, high hardness and high modulus of elasticity, said end faces defining an annular sealing gap between them generating upon relative rotation of said end faces a gas pressure in said sealing gap blocking passage of fluid past said assembly, at last one of said end faces being provided with an array of equispaced triangular recesses adjacent an outer periphery of said one of said end faces and symmetrical with reference to respective radii from said axis and having vertices lying along said outer periphery; and spring means including at least one spring braced between said housing and said stator sealing ring and applying to said stator sealing ring a predetermined axial force acting in a direction opposite the action of said gas pressure in said sealing gap on said stator sealing ring, said stator sealing ring and said rotor sealing ring being composed of materials having a thermal conductivity in excess of 70 W/mK (=kJ/mhK), a modulus of elasticity in excess of 250,000 N/mm2, a pore volume of less than 1% and a surface roughness less than 0.3 m0.4 mm, and said O-ring forming a position-compensating centering ring for said stator sealing ring on said cylindrical portion and having a material hardness less than 90 Shore A and greater than an extrusion limit of material hardness for extrusion of said O-ring into said functional annular gap at said gap width and 70 Shore A and under an operating pressure differential of substantially 300 to 500 bar.