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US 6,845,985 B2Granted
Rotating mechanical seal
AssigneeFirma Carl Freudenberg
InventorReinhold Kraus
Life of this patent
Estimating the term…
Abstract
A rotating mechanical seal with a sliding ring, characterized by the sliding ring (5) being attached by way of an O-ring (6) on a shaft (1) of a compressor and rotating with the shaft (1) and by a non-rotating backing ring (4) being provided which is attached by way of an O-ring (3) to a housing (2) of the compressor so as to be gas-tight wherein the sliding ring (5) and backing ring (4) are pressed one against another by a spring (8) to form a seal and slide one upon the other, wherein one of the rings (4,5) is made of a carbon and silicon carbide composite material and the other of a silicon carbide material.
Claims8
A rotating mechanical seal comprising:
- a sliding ring (5) being attached to a shaft (1) by an O-ring (6), the sliding ring rotating with the shaft (1);
- and a non-rotating backing ring (4) which is attached by way of an O-ring (3) to a housing (2) of a compressor so as to be gas-tight, wherein the sliding ring (5) and backing ring (4) are pressed one against the other by way of a spring (8) to form a seal and slide one upon the other, and wherein one of the rings (4, 5) is made of a carbon and silicon carbide composite material and the other of a silicon carbide material,
- wherein the carbon and silicon carbide composite material exhibits sealing surface properties with a roughness value of from 0.005 to 0.07 μm and the silicon carbide material exhibits sealing surface properties with a roughness value from 0.002 to 0.03 μm, expressed as mean arithmetic roughness (Ra), with the pores being excepted.
A rotating mechanical seal comprising:
- a sliding ring (5) being attached to a shaft (1) by an O-ring (6), the sliding ring rotating with the shaft (1);
- and a non-rotating backing ring (4) which is attached by way of an O-ring (3) to a housing (2) of a compressor so as to be gas-tight, wherein the sliding ring (5) and backing ring (4) are pressed one against the other by way of a spring (8) to form a seal and slide one upon the other, and wherein one of the rings (4, 5) is made of a carbon and silicon carbide composite material and the other of a silicon carbide material,
- wherein the carbon and silicon carbide composite material exhibits a structure which is obtained by partial conversion of the surface layer of the carbon substrate into a silicon carbide material, and
- wherein the carbon and silicon carbide composite material exhibits sealing surface properties with a roughness value of from 0.005 to 0.07 μm and the silicon carbide material exhibits sealing surface properties with a roughness value from 0.002 to 0.03 μm, expressed as mean arithmetic roughness (Ra), with the pores being excepted.
1 more element
A rotating mechanical seal comprising:
- a sliding ring (5) being attached to a shaft (1) by an O-ring (6), the sliding ring rotating with the shaft (1);
- and a non-rotating backing ring (4) which is attached by way of an O-ring (3) to a housing (2) of a compressor so as to be gas-tight, wherein the sliding ring (5) and backing ring (4) are pressed one against the other by way of a spring (8) to form a seal and slide one upon the other, and wherein one of the rings (4, 5) is made of a carbon and silicon carbide composite material and the other of a silicon carbide material,
- wherein the surface of the carbon and silicon carbide composite material has a carbon content from 40% to 85% and a silicon conversion ratio of from 60% to 15%, and
- wherein the carbon and silicon carbide composite material exhibits sealing surface properties with a roughness value of from 0.005 to 0.07 μm and the silicon carbide material exhibits sealing surface properties with a roughness value from 0.002 to 0.03 μm, expressed as mean arithmetic roughness (Ra), with the pores being excepted.
1 more element
A rotating mechanical seal comprising:
- a sliding ring (5) being attached to a shaft (1) by an O-ring (6), the sliding ring rotating with the shaft (1);
- and a non-rotating backing ring (4) which is attached by way of an O-ring (3) to a housing (2) of a compressor so as to be gas-tight, wherein the sliding ring (5) and backing ring (4) are pressed one against the other by way of a spring (8) to form a seal and slide one upon the other, and wherein one of the rings (4, 5) is made of a carbon and silicon carbide composite material and the other of a silicon carbide material,
- wherein the carbon and silicon carbide composite material exhibits a structure which is obtained by partial conversion of the surface layer of the carbon substrate into a silicon carbide material,
- wherein the surface of the carbon and silicon carbide composite material has a carbon content from 40% to 85% and a silicon conversion ratio of from 60% to 15%, and
- wherein the carbon and silicon carbide composite material exhibits sealing surface properties with a roughness value of from 0.005 to 0.07 μm and the silicon carbide material exhibits sealing surface properties with a roughness value from 0.002 to 0.03 μm, expressed as mean arithmetic roughness (Ra), with the pores being excepted.
2 more elements
A rotating mechanical seal comprising:
- a sliding ring (5) being attached to a shaft (1) by an O-ring (6), the sliding ring rotating with the shaft (1);
- and a non-rotating backing ring (4) which is attached by way of an O-ring (3) to a housing (2) of a compressor so as to be gas-tight, wherein the sliding ring (5) and backing ring (4) are pressed one against the other by way of a spring (8) to form a seal and slide one upon the other, and wherein one of the rings (4, 5) is made of a carbon and silicon carbide composite material and the other of a silicon carbide material,
- wherein the silicon carbide material exhibits individual, non-contiguous pores of a mean pore size of not greater than 60 μm at porosity of from 2% to 15%, and
- wherein the carbon and silicon carbide composite material exhibits sealing surface properties with a roughness value of from 0.005 to 0.07 μm and the silicon carbide material exhibits sealing surface properties with a roughness value from 0.002 to 0.03 μm, expressed as mean arithmetic roughness (Ra), with the pores being excepted.
1 more element
A rotating mechanical seal comprising:
- a sliding ring (5) being attached to a shaft (1) by an O-ring (6), the sliding ring rotating with the shaft (1);
- and a non-rotating backing ring (4) which is attached by way of an O-ring (3) to a housing (2) of a compressor so as to be gas-tight, wherein the sliding ring (5) and backing ring (4) are pressed one against the other by way of a spring (8) to form a seal and slide one upon the other, and wherein one of the rings (4, 5) is made of a carbon and silicon carbide composite material and the other of a silicon carbide material,
- wherein the carbon and silicon carbide composite material exhibits a structure which is obtained by partial conversion of the surface layer of the carbon substrate into a silicon carbide material,
- wherein the silicon carbide material exhibits individual, non-contiguous pores of a mean pore size of not greater than 60 μm at porosity of from 2% to 15%, and
- wherein the carbon and silicon carbide composite material exhibits sealing surface properties with a roughness value of from 0.005 to 0.07 μm and the silicon carbide material exhibits sealing surface properties with a roughness value from 0.002 to 0.03 μm, expressed as mean arithmetic roughness (Ra), with the pores being excepted.
2 more elements
A rotating mechanical seal comprising:
- a sliding ring (5) being attached to a shaft (1) by an O-ring (6), the sliding ring rotating with the shaft (1);
- and a non-rotating backing ring (4) which is attached by way of an O-ring (3) to a housing (2) of a compressor so as to be gas-tight, wherein the sliding ring (5) and backing ring (4) are pressed one against the other by way of a spring (8) to form a seal and slide one upon the other, and wherein one of the rings (4, 5) is made of a carbon and silicon carbide composite material and the other of a silicon carbide material,
- wherein the surface of the carbon and silicon carbide composite material has a carbon content from 40% to 85% and a silicon conversion ratio of from 60% to 15%,
- wherein the silicon carbide material exhibits individual, non-contiguous pores of a mean pore size of not greater than 60 μm at porosity of from 2% to 15%, and
- wherein the carbon and silicon carbide composite material exhibits sealing surface properties with a roughness value of from 0.005 to 0.07 μm and the silicon carbide material exhibits sealing surface properties with a roughness value from 0.002 to 0.03 μm, expressed as mean arithmetic roughness (Ra), with the pores being excepted.
2 more elements
A rotating mechanical seal comprising:
- a sliding ring (5) being attached to a shaft (1) by an O-ring (6), the sliding ring rotating with the shaft (1);
- and a non-rotating backing ring (4) which is attached by way of an O-ring (3) to a housing (2) of a compressor so as to be gas-tight, wherein the sliding ring (5) and backing ring (4) are pressed one against the other by way of a spring (8) to form a seal and slide one upon the other, and wherein one of the rings (4, 5) is made of a carbon and silicon carbide composite material and the other of a silicon carbide material,
- wherein the carbon and silicon carbide composite material exhibits a structure which is obtained by partial conversion of the surface layer of the carbon substrate into a silicon carbide material,
- wherein the surface of the carbon and silicon carbide composite material has a carbon content from 40% to 85% and a silicon conversion ratio of from 60% to 15%,
- wherein the silicon carbide material exhibits individual, non-contiguous pores of a mean pore size of not greater than 60 μm at porosity of from 2% to 15%, and
- wherein the carbon and silicon carbide composite material exhibits sealing surface properties with a roughness value of from 0.005 to 0.07 μm and the silicon carbide material exhibits sealing surface properties with a roughness value from 0.002 to 0.03 μm, expressed as mean arithmetic roughness (Ra), with the pores being excepted.
3 more elements
Dependencies are inferred from the claim text.