Reverse bypass cooling for tilted pad journal and tilting pad thrust bearings
View Patent ↗A bypass cooling system and method for tilting pad journal and titling pad thrust bearings wherein the cooling may be achieved by spraying the cool inlet oil downhill with gravity instead of always in the direction of the shaft rotation. A bypass cooling system always sprays the cool inlet oil downhill, with gravity instead of always in the direction of shaft rotation.
1. A bearing assembly for supporting a rotatable member, said bearing assembly comprising:
a bearing casing having an inner surface;
a plurality of pads mounted to the inner surface of the bearing casing, the pads having bearing surfaces that support the rotatable member, and said pads having outer surfaces spaced from the bearing surfaces;
a blocker bar mounted to an upper half of the inner surface of the bearing casing, said blocker bar positioned intermediate of an upper first pad and an upper second pad of the plurality of the pads, said upper first pad being adjacent to said upper second pad; the blocker bar comprising,
a reverse bypass oil conduit positioned to deliver liquid coolant under pressure against the direction of shaft rotation toward a trailing edge of the upper first pad, and
a standard bypass oil conduit positioned to deliver liquid coolant under pressure in the direction of shaft rotation toward a leading edge of the upper second pad.
2. The bearing assembly of claim 1 , wherein the bearing assembly comprises a tilting pad journal bearing or a tilting pad thrust bearing.
3. The bearing assembly of claim 1 , further comprising circumferential heat transfer chambers positioned on the outer surfaces of the plurality of pads, wherein the liquid coolant delivered by the reverse bypass oil conduit traverses said heat transfer chambers against the direction of shaft rotation, and wherein the liquid coolant delivered by the standard bypass oil conduit traverses said heat transfer chambers in the direction of shaft rotation.
4. The bearing assembly of claim 3 wherein the circumferential heat transfer chambers are open grooves provided on the outer surface of the plurality of pads.
5. The bearing assembly of claim 4 , wherein said axial cooling bore hole of said upper first pad extends from said leading or said trailing edge to said outer surface of said upper first pad, and wherein said axial cooling bore hole of said upper second pad extends from said leading or trailing edge to said outer surface of said upper second pad.
6. The bearing assembly of claim 1 , further comprising an axial cooling bore hole drilled through the upper first pad and an axial cooling bore hole axially drilled through the upper second pad, wherein the liquid coolant delivered by the reverse bypass oil conduit traverses through said cooling bore hole in said upper first pad against the direction of the shaft rotation, and wherein the liquid coolant delivered by the standard bypass oil conduit traverses through said cooling bore hole in said upper second pad in the direction of the shaft rotation.
7. The bearing assembly of claim 6 , wherein said axial cooling bore hole of said upper first pad extends from said leading or said trailing edge to said outer surface of said upper first pad, and wherein said axial cooling bore hole of said upper second pad extends from said leading or trailing edge to said outer surface of said upper second pad.
8. The bearing assembly of claim 1 , wherein the plurality of pads are tiltably mounted on the inner surface of the bearing casing to accommodate horizontal and vertical shift of the rotatable member.
9. The bearing assembly of claim 1 , wherein said upper first pad is an upper left pad and said upper second pad is an upper right pad.
10. The bearing assembly of claim 1 , wherein said upper first pad is an upper right pad and said upper second pad is an upper left pad.
11. The bearing assembly of claim 1 , wherein said blocker bar is a spray bar.
12. A tilting pad journal bearing or a tilting pad thrust bearing assembly for supporting a rotatable member, said bearing assembly comprising:
a bearing casing having an inner surface;
a plurality of pads mounted to the inner surface of the bearing casing, the pads having bearing surfaces that support the rotatable member, said pads comprising an upper first pad and an upper second pad, said plurality of pads having outer surfaces spaced from the bearing surfaces, said upper first pad being adjacent to said upper second pad, said upper first pad and said upper second pad each respectively having a leading edge and a trailing edge with respect to the rotatable member;
a blocker bar extending radially and between said leading edge and said trailing edge of said adjacent first upper pad and said second upper pad, said blocker bar mounted to a top end of the inner surface of the bearing casing, said blocker bar positioned intermediate of said adjacent upper first pad and said upper second pad, the blocker bar having bidirectional cooling oil conduits, comprising:
a plurality of reverse bypass oil conduits positioned to deliver liquid coolant under pressure against the direction of shaft rotation, at least one of said reverse bypass oil conduits configured to deliver said liquid coolant to heat transfer chambers on said outer surface of said upper first pad, at least another of said reverse bypass oil conduits configured to deliver said liquid coolant to an axial cooling bore hole drilled through the upper first pad, and
a plurality of standard bypass oil conduits positioned to deliver liquid coolant under pressure in the direction of shaft rotation, at least one of said standard bypass oil conduits configured to deliver said liquid coolant to heat transfer chambers on said outer surface of said upper second pad, at least another of said standard bypass oil conduits configured to deliver said liquid coolant to an axial cooling bore hole drilled through the upper second pad.
13. The bearing assembly of claim 12 , wherein the plurality of pads are tiltably mounted on the inner surface of the bearing casing to accommodate horizontal and vertical shift of the rotatable member.
14. The bearing assembly of claim 12 , wherein said upper first pad is an upper left pad and said upper second pad is an upper right pad.
15. The bearing assembly of claim 12 , wherein said upper first pad is an upper right pad and said upper second pad is an upper left pad.
16. The bearing assembly of claim 12 , wherein said blocker bar is a spray bar.
17. The bearing assembly of claim 12 , wherein the plurality of pads are tiltably mounted on the inner surface of the bearing casing to accommodate horizontal and vertical shift of the rotatable member.