In a reciprocating sealing device sealing two members by mounting a packing to a mounting groove in one of two relatively reciprocating members, and bringing the packing into contact with the other member, the packing is provided with an annular base part, a stationary side lip, and a sliding side l
In a reciprocating sealing device sealing two members by mounting a packing to a mounting groove in one of two relatively reciprocating members, and bringing the packing into contact with the other member, the packing is provided with an annular base part, a stationary side lip, and a sliding side lip. A back ring having a lower hardness than the packing is interposed between the annular base part and a groove side surface of the mounting groove. The back ring forms a space region in relation to the other member. The annular base part is provided with a shape that the annular base part does not protrude out of an extension of a peripheral surface of the sliding side lip in a free state by forming a cross sectional shape of a heel part into a circular arc shape or a taper shape.
대표청구항▼
1. A reciprocating sealing device comprising: first and second members which relatively perform a reciprocating motion;a mounting groove which is provided in said first member;a packing which is mounted to the mounting groove; andsaid packing sealing between said first and second members by slidably
1. A reciprocating sealing device comprising: first and second members which relatively perform a reciprocating motion;a mounting groove which is provided in said first member;a packing which is mounted to the mounting groove; andsaid packing sealing between said first and second members by slidably coming into close contact with said second member,wherein said packing is integrally provided with an annular base part, a stationary side lip diagonally projecting from said base part and which comes into close contact with a groove bottom surface of said mounting groove, and a sliding side lip diagonally projecting from said annular base part and which slidably comes into close contact with said second member such that said packing is V-shaped in cross-section,wherein a first lip end annularly projects from said stationary side lip, and a second lip end annularly projects from said sliding side lip, said first and second lip ends being configured to locally enhance seal surface pressure, andwherein a back ring made of a material having a lower hardness than said packing directly abuttingly engages an end surface of the annular base part of said packing and directly abuttingly engages a low pressure side groove side surface of said mounting groove,said back ring forms an open space region extending from said back ring to said second member,said annular base part does not protrude to said second member side from an extension of a conical surface of said sliding side lip in a free state, said conical surface extending from said second lip end toward said end surface, said annular base part including: an annular flat part along said end surface where said end surface comes into contact with said back ring, anda heel part extending from said conical surface facing said second member to said annular flat part, said heel part having a circular arc shape, andan outer diameter of said back ring is smaller than an inner diameter of said second member and an outer diameter of said first member. 2. A reciprocating sealing device comprising: first and second members which relatively perform a reciprocating motion;mounting groove which is provided in said first member;a packing which is mounted to the mounting groove; andsaid packing sealing between said first and second members by slidably coming into close contact with said second member,wherein said packing is integrally provided with an annular base part, a stationary side lip diagonally projecting from said base part and which comes into close contact with a groove bottom surface of said mounting groove, and a sliding side lip diagonally projecting from said annular base part and which slidably comes into close contact with said second member such that said packing is V-shaped in cross-section,wherein a first lip end annularly projects from said stationary side lip, and a second lip end annularly projects from said sliding side lip, said first and second lip ends being configured to locally enhance seal surface pressure, andwherein a back ring made of a material having a lower hardness than said packing directly abuttingly engages an end surface of the annular base part of said packing and directly abuttingly engages a low pressure side groove side surface of said mounting groove,said back ring forms an open space region extending from said back ring to said second member,said annular base part does not protrude to said second member side from an extension of a peripheral surface of said sliding side lip in a free state, said annular base part including: an annular flat part along said end surface where said end surface comes into contact with said back ring, anda heel part extending from a peripheral surface facing said second member to said annular flat part, said heel part having a taper shape, andan outer diameter of said back ring is smaller than an inner diameter of said second member and an outer diameter of said first member. 3. The reciprocating sealing device according to claim 1, wherein the flat part is formed into an axially vertical plane, at least in the range coming into contact with said back ring. 4. The reciprocating sealing device according to claim 2, wherein the flat part is formed into an axially vertical plane, at least in the range coming into contact with said back ring.
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Morales Kenneth A. (Cayce SC), Actuating sealing joint.
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