Reciprocating seal for high pulsating pressure
First Claim
Patent Images
1. A seal assembly comprising:
- a rigid support ring or a backup ring comprising a terminal end portion along an inside diameter and a terminal end portion along an outside diameter, a concave interface surface, a bore defined by the inside diameter, and a most concave part of the concave interface surface defining a plane orthogonal to an axis passing through the inside diameter;
a seal ring comprising a convex surface on an outer face matching the concave interface surface, a center channel section, an inner flange having a sealing lip, and an outer flange; and
said seal ring comprising a recessed section formed at the outer flange at a location proximate an inner surface of a gland against which part of the outside flange of the seal ring seals when the seal assembly is located in the gland;
a spring cavity defined by the center channel section, the inner flange, and the outer flange of the seal ring;
a canted coil spring comprising a plurality of interconnected canted coils located in the spring cavity of the seal ring and being in contact with the inner flange of the seal ring biasing both the inner flange of the seal ring and the outer flange of the seal ring away from one another;
wherein the convex surface of the seal ring is in direct abutting contact with the concave interface surface without mechanical inter-engagement and wherein the terminal end portion along the outside diameter of the rigid support ring or backup ring extends away from the plane defined by the most concave part of the concave interface surface and along a corresponding portion of a first outer edge of the seal ring proximate the outer flange and the recessed section of the outer flange, and the terminal end portion along the inside diameter of the rigid support ring or backup ring extends away from the plane defined by the most concave part of the concave interface surface and along a corresponding portion of a second outer edge of the seal ring proximate the inner flange.
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Accused Products
Abstract
Device, system, and method are described directed to seal assemblies with support to reduce seal extrusion under high to very high pressure changes due to repeated piston reciprocating movement. In some examples, concave features are incorporated on the inner and outer edges of support and backup ring elements to support and hug the preceding element and constrain extrusion, as well as utilizing multiple contact points on certain elements in order to reduce friction against the dynamic surface. The seal assemblies described herein can also incorporate bearing surfaces to reduce damage to seal ID due to off-axis floating rod, such as incorporating one or more multi-point contacts to reduce friction.
67 Citations
25 Claims
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1. A seal assembly comprising:
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a rigid support ring or a backup ring comprising a terminal end portion along an inside diameter and a terminal end portion along an outside diameter, a concave interface surface, a bore defined by the inside diameter, and a most concave part of the concave interface surface defining a plane orthogonal to an axis passing through the inside diameter; a seal ring comprising a convex surface on an outer face matching the concave interface surface, a center channel section, an inner flange having a sealing lip, and an outer flange; and
said seal ring comprising a recessed section formed at the outer flange at a location proximate an inner surface of a gland against which part of the outside flange of the seal ring seals when the seal assembly is located in the gland;a spring cavity defined by the center channel section, the inner flange, and the outer flange of the seal ring; a canted coil spring comprising a plurality of interconnected canted coils located in the spring cavity of the seal ring and being in contact with the inner flange of the seal ring biasing both the inner flange of the seal ring and the outer flange of the seal ring away from one another; wherein the convex surface of the seal ring is in direct abutting contact with the concave interface surface without mechanical inter-engagement and wherein the terminal end portion along the outside diameter of the rigid support ring or backup ring extends away from the plane defined by the most concave part of the concave interface surface and along a corresponding portion of a first outer edge of the seal ring proximate the outer flange and the recessed section of the outer flange, and the terminal end portion along the inside diameter of the rigid support ring or backup ring extends away from the plane defined by the most concave part of the concave interface surface and along a corresponding portion of a second outer edge of the seal ring proximate the inner flange. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for manufacturing a seal assembly comprising:
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providing at least two mating components; wherein at least one component is a seal ring comprising an inner flange, an outer flange, and a center channel section defining a cavity and at least one component is a rigid support ring or a backup ring, and wherein a recessed section is formed at the outer flange at a location proximate an inner surface of a gland against which part of the outside flange of the seal ring seals when the seal assembly is located in the gland; the at least one of the rigid support ring or the backup ring comprises a terminal end portion along an inside diameter and a terminal end portion along an outside diameter, a concave interface surface, a bore defined by the inside diameter, and a most concave part of the concave interface surface defining a plane orthogonal to an axis passing through the inside diameter; and the seal ring comprises a convex surface to accept the concave interface surface; and placing the seal ring in direct contact with the rigid support ring or the backup ring so that the convex surface on the seal ring directly contacts the concave interface surface on the rigid support ring or the backup ring; and wherein a canted coil spring comprising a plurality of interconnected canted coils is disposed in the cavity and biasing both the inner flange of the seal ring and the outer flange of the seal ring away from one another and the groove is spaced from the seal ring; and wherein the convex surface of the seal ring is in direct abutting contact with the concave interface surface without mechanical inter-engagement and wherein the terminal end portion along the outside diameter of the rigid support ring or backup ring extends away from the plane defined by the most concave part of the concave interface surface and along a corresponding portion of a first outer edge of the seal ring proximate the outer flange and the recessed section of the outer flange, and the terminal end portion along the inside diameter of the rigid support ring or backup ring extends away from the plane defined by the most concave part of the concave interface surface and along a corresponding portion of a second outer edge of the seal ring proximate the inner flange. - View Dependent Claims (16, 17, 18)
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19. A seal assembly comprising:
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a rigid support ring or a backup ring comprising a first interface surface, a second interface surface, a terminal end portion along an inside diameter and a terminal end portion along an outside diameter; a seal ring comprising an interface feature, a center channel section, an inside flange, and an outside flange defining a spring cavity having a canted coil spring located therein biasing the inside flange of the seal ring and the outside flange of the seal ring away from one another, said seal ring further comprising a recessed section formed between the inside flange of the seal ring and a shaft against which a sealing lip of the inside flange of the seal ring seals and a recessed section formed at the outer flange at a location proximate an inner surface of a gland against which part of the outside flange of the seal ring seals; a support foot on the rigid support ring or backup ring extending into the recessed section, the support foot comprising an inner bearing comprising multi-point contacts defined by a recess; wherein the interface feature of the seal ring directly contacts the first interface surface of the rigid support ring or the backup ring without mechanical inter-engagement, and wherein the terminal end portion along the outside diameter of the rigid support ring or the backup ring extends along a corresponding portion of the seal ring proximate the outer flange and the recessed section of the outer flange; and wherein a slant section of the support foot projects into the recessed section of the seal ring to support the inside flange from extrusion by operating seal box pressure. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification