Low and reverse pressure application hydrodynamic pressurizing seals
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F16J-015/34
F16J-015/447
출원번호
US-0105032
(2011-05-11)
등록번호
US-8356819
(2013-01-22)
발명자
/ 주소
Vasagar, Thurai Manik
Garrison, Glenn M.
McNickle, Diane R.
출원인 / 주소
Stein Seal Company
인용정보
피인용 횟수 :
3인용 특허 :
7
초록▼
The present invention relates to circumferential seal ring segments positioned around a rotating shaft so as to prevent fluids from leaking from a lubricant sump during both low and high pressure conditions. The circumferential seal is comprised of a plurality of adjoining annular ring segments faci
The present invention relates to circumferential seal ring segments positioned around a rotating shaft so as to prevent fluids from leaking from a lubricant sump during both low and high pressure conditions. The circumferential seal is comprised of a plurality of adjoining annular ring segments facing the rotating shaft. Each sealing ring segment includes a dead end circumferential groove on a shaft-side face of each sealing ring such that, when the segments are joined, the circumferential dead end groove of each segment extends arcuately in the direction of shaft rotation. At least one additional groove is contained on the shaft-side face of each sealing ring segment. Each additional groove is an axial bore groove extending perpendicularly to a longitudinal axis of the seal ring segment in fluid communication with the dead end circumferential groove so as to direct fluid flow generated from a rotating shaft into the dead end circumferential groove. The additional groove(s) directs and creates pressurized air within the dead end circumferential groove, either directly or indirectly maintaining a seal between the ring segments and the shaft. A bleed hole may also be provided to create a seal between each sealing segment.
대표청구항▼
1. A method of sealing a liquid region from a gas region across an annular surface of a rotating shaft utilizing a plurality of adjoining annularly sealing ring segments facing the rotating shaft, each sealing ring segment having a dead end circumferential groove formed within a shaft-side face of e
1. A method of sealing a liquid region from a gas region across an annular surface of a rotating shaft utilizing a plurality of adjoining annularly sealing ring segments facing the rotating shaft, each sealing ring segment having a dead end circumferential groove formed within a shaft-side face of each sealing ring segment at a position closer to the liquid region than to the gas region such that, when the sealing ring segments are positioned proximate the annular surface, the dead end circumferential groove of each sealing ring segment extends arcuately in direction of shaft rotation, and at least one additional groove, selected from the group consisting of a hydrodynamic inclined groove, a hydrodynamic shallow pocket, and an axial bore groove, formed on the shaft-side face of each sealing ring segment wherein the additional groove(s) is in fluid communication with the dead end circumferential groove comprising; urging the sealing ring segments toward the rotating shaft such that the sealing ring segments from a seal with the rotating shaft when the rotating shaft is not rotating;rotating the rotating shaft;directing fluid flow generated by the rotating shaft along the additional groove(s) and into the dead end circumferential groove such that the fluid is pressured as it flows along the additional groove(s) and into the dead end circumferential groove;redirecting the pressurized fluid within the dead end circumferential groove toward the rotating shaft so as to provide a lift force on the sealing ring segments that lifts the sealing ring segments away from the rotating shaft;creating an air seal around the rotating shaft as the pressurized air within the dead end circumferential groove is urged toward the rotating shaft, thereby, maintaining a seal between the rotating shaft and the sealing ring segments during rotation and non-rotation of the rotating shaft; anddirecting fluid flow generated by the rotating shaft along the additional groove(s) and into the dead end circumferential groove by way of at least one longitudinal bore groove and pressure chamber, each longitudinal bore groove directly contacts one additional groove at a first end of the longitudinal bore groove and directly contacts one pressure chamber at a second end of the longitudinal bore grove, each longitudinal bore groove separate from and substantially parallel to the dead end circumferential groove. 2. A seal assembly for sealing a liquid region from a gas region across an annular surface of a rotating shaft comprising: a plurality of adjoining annularly sealing ring segments facing the rotating shaft wherein each sealing ring segment includes a dead end circumferential groove along a shaft-side face of each sealing ring segment such that, when the sealing ring segments are joined about the annular surface, the dead end circumferential groove of each sealing ring segment extends arcuately in direction of shaft rotation;an axial bore groove extending across the shaft-side face of each sealing ring segment leading to the dead end circumferential groove wherein the axial bore groove is in fluid communication with the dead end circumferential groove and directs a fluid into the dead end circumferential groove during rotation of the rotating shaft; anda first longitudinal bore groove along a longitudinal axis of each sealing ring segment, the first longitudinal bore groove directly contacts the axial bore groove at a first end of the longitudinal bore groove, the first longitudinal bore groove directly contacts a first pressure chamber at a second end of the first longitudinal bore groove, the first pressure chamber is recessed along the sealing ring segment, the first longitudinal bore groove separate from and substantially parallel to the dead end circumferential groove, the axial bore groove in direct fluid communication with the first longitudinal bore groove, the first longitudinal bore groove in direct fluid communication with the first pressure chamber, the axial bore groove in direct fluid communication with the dead end circumferential groove, the axial bore groove directly contacts the dead end circumferential groove. 3. The assembly of claim 2 wherein the first longitudinal bore groove contains at least one hydrodynamic groove on an inner surface of the longitudinal bore groove wherein the hydrodynamic groove(s) extends along the longitudinal bore groove at an oblique angle with respect to the longitudinal axis of the longitudinal bore groove and is angled such that the hydrodynamic groove(s) directs air from the axial bore groove into the first pressure chamber. 4. The assembly of claim 2 wherein the first pressure chamber is in direct fluid communication via a bleed slot with a joint between adjoining sealing ring segments such that fluid flow is directed into the joint by way of the axial bore groove, the first longitudinal bore groove and the first pressure chamber. 5. A seal assembly for sealing a liquid region from a gas region across an annular surface of a rotating shaft comprising: a plurality of adjoining annularly sealing ring segments facing the rotating shaft wherein each sealing ring segment includes a dead end circumferential groove along a shaft-side face of each sealing ring segment such that, when the sealing ring segments are joined about the annular surface, the dead end circumferential groove of each sealing ring segment extends arcuately in direction of shaft rotation;an axial bore groove extending across the shaft-side face of each sealing ring segment leading to the dead end circumferential groove wherein the axial bore groove is in fluid communication with the dead end circumferential groove and directs a fluid into the dead end circumferential groove during rotation of the rotating shaft; anda first longitudinal bore groove along a longitudinal axis of each sealing ring segment, the first longitudinal bore groove directly contacts the axial bore groove at a first end of the first longitudinal bore groove, the first longitudinal bore groove directly contacts a first pressure chamber at a second end of the first longitudinal bore groove, the first pressure chamber recessed along the sealing ring segment, the first longitudinal bore groove separate from and substantially parallel to the dead end circumferential groove, the axial bore groove in direct fluid communication with the first longitudinal bore groove, the first longitudinal bore groove in direct fluid communication with the first pressure chamber, the axial bore groove is in fluid communication with the dead end circumferential groove by way of the first pressure chamber, the first pressure chamber directly contacts the dead end circumferential groove. 6. The assembly of claim 5 wherein the first longitudinal bore groove contains at least one hydrodynamic groove on an inner surface of the longitudinal bore groove wherein the hydrodynamic groove(s) extends along the longitudinal bore groove at an oblique angle with respect to the longitudinal axis of the longitudinal bore groove and is angled such that the hydrodynamic groove(s) directs air from the axial bore groove into the first pressure chamber. 7. The assembly of claim 5 further comprising a second longitudinal bore groove which directly contacts and extends from the axial bore groove and along the longitudinal axis of the sealing ring segment to a second pressure chamber wherein the second pressure chamber is in direct fluid communication via a bleed slot with a joint between adjoining sealing ring segments such that fluid flow is directed into the joint by way of the axial bore groove, the second longitudinal bore groove and the second pressure chamber, the second longitudinal bore groove separate from and substantially parallel to the first longitudinal groove, the first pressure chamber separately disposed from the second pressure chamber. 8. The assembly of claim 7 wherein the second longitudinal bore groove contains at least one hydrodynamic groove on an inner surface of the longitudinal bore groove wherein the hydrodynamic groove(s) extends along the longitudinal bore groove at an oblique angle with respect to the longitudinal axis of the longitudinal bore groove and is angled such that the hydrodynamic groove(s) directs air from the axial bore groove into the second pressure chamber. 9. The assembly of claim 5 further comprising a dam extending between the first pressure chamber and the dead end circumferential groove. 10. The assembly of claim 9 further comprising a bleed slot passing through the dam from the first pressure chamber to the dead end circumferential groove. 11. A seal assembly for sealing a liquid region from a gas region across an annular surface of a rotating shaft comprising: a plurality of adjoining annularly sealing ring segments facing the rotating shaft wherein each sealing ring segment includes a dead end circumferential groove recessed along a shaft-side face of each sealing ring segment such that, when the sealing ring segments are joined about the annular surface, the dead end circumferential groove of each sealing ring segment extends arcuately in direction of shaft rotation;an axial bore groove extending across the shaft-side face of each sealing ring segment leading to the dead end circumferential groove wherein the axial bore groove is in fluid communication with the dead end circumferential groove and directs a fluid into the dead end circumferential groove during rotation of the rotating shaft; anda plurality of longitudinal bore grooves along a longitudinal axis of each sealing ring segment, the longitudinal bore grooves directly contact the axial bore groove at a first end of the longitudinal bore grooves, the longitudinal bore grooves directly contact a pressure chamber at a second end of the longitudinal bore grooves, the longitudinal bore grooves separate from and substantially parallel to one another and the dead end circumferential groove, the pressure chamber recessed along the sealing ring segment and directly contacts one end of the dead end circumferential groove, the axial bore groove in direct fluid communication with the longitudinal bore grooves, the longitudinal bore grooves in direct fluid communication with the pressure chamber, the pressure chamber in direct fluid communication with the dead end circumferential groove. 12. The assembly of claim 11 wherein the dead end circumferential groove is in fluid communication via a bleed slot with a joint between adjoining sealing ring segments such that fluid flow is directed into the joint by way of the axial bore groove, the longitudinal bore grooves, the pressure chamber and the dead end circumferential groove, the bleed slot directly contacts the dead end circumferential groove at an end opposite of contact with the pressure chamber. 13. The assembly of claim 11 wherein the longitudinal bore grooves contain at least one hydrodynamic groove on an inner surface of the longitudinal bore grooves wherein the hydrodynamic groove(s) extends along the longitudinal bore grooves at an oblique angle with respect to the longitudinal axis of the longitudinal bore grooves and is angled such that the hydrodynamic groove(s) directs air from the axial bore groove into the pressure chamber.
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이 특허에 인용된 특허 (7)
Pope Adam N. (Cincinnati OH) Hwang Ming-Fong (Chester OH), Effective sealing device for engine flowpath.
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