OIL BEARING WITH DRAIN SYSTEM, GAS TURBINE COMPRISING SUCH AN OIL BEARING

• US 20160195016A1
• Filed: 07/07/2014
• Published: 07/07/2016
• Est. Priority Date: 09/30/2013
• Status: Active Grant

• Current Assignee: Siemens Energy Global GmbH & Co. KG (Siemens AG)
• Original Assignee: Siemens AG
• Inventors: Burns, Nigel, Frejd, Mikael, Andersson, Thomas
• Granted Patent: US 10,138,813 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F01D 25/16 Arrangement of bearings; Supporting or mounting bearings in casings bearings per se F16C
• CPC Class Codes: F01D 25/18 Lubricating arrangements of machines or engines in general F01M
• CPC Class Codes: F02C 7/06 Arrangements of bearings bearings F16C; Lubricating of turbo machines F01D25/18; of machines or engines in general F01M
• CPC Class Codes: F02C 7/20 Mounting or supporting of plant; Accommodating heat expansion or creep
• CPC Class Codes: F16C 2360/23 Gas turbine engines in general F02C
• CPC Class Codes: F16C 33/1045 Details of supply of the liquid to the bearing

Abstract

An oil bearing to support a rotor of a turbine, especially of a gas turbine, wherein the rotor extends along a rotor axis coinciding with a bearing axis, has at least one oil bearing pad being lubricated by oil, including an oil sump suitable and located to collect the oil from the bearing pads by forces of gravity, including a drain system of the oil sump to conduct the oil away from the oil sump. The drain system includes at least three drain openings of the oil sump, wherein a first drain opening joining a first drain line is located between 4 o'"'"'clock and 5 o'"'"'clock according to the bearing axis, wherein a second drain opening joining a second drain line is located between 5:30 and 6:30, wherein a third drain opening joining a third drain line is located between 7 o'"'"'clock and 8 o'"'"'clock.

Claims

1. An oil bearing (OB) to support a rotor of a turbine, wherein said rotor extends along a rotor axis coinciding with a bearing axis (x), comprising:

at least one oil bearing pad (BP) being lubricated by oil,

an oil sump (OS) suitable and located to collect said oil from said bearing pads (BP) by forces of gravity,

a drain system of said oil sump (OS) adapted to conduct said oil away from said oil sump (OS),

wherein said drain system comprises at least three drain openings (OP1, OP2, OP3) of said oil sump (OS), comprising

a first drain opening (OP1) joining a first drain line (ODL) located between 4 o'"'"'clock and 5 o'"'"'clock according to said bearing axis (x),

a second drain opening (OP2) joining a second drain line (ODL) located between 5;

30 and 6;

30,

a third drain opening (OP3) joining a third drain line (ODL) located between 7 o'"'"'clock and 8 o'"'"'clock.

2. The oil bearing (OB) according to claim 1, further comprising:

an oil supply line (OSL) let through said first and/or third drain opening to supply oil to said bearing pads (BP).

3. The oil bearing (OB) according to claim 1, further comprising:

bearing instrumentation (TT, PP) cables let through said first and/or third drain opening (OP1, OP3) to connect bearing instrumentation (TT, PP) to a power supply (PS) and/or a signal processing unit (CPU).

4. The oil bearing (OB) according to claim 1,

wherein said oil sump (OS) and said drain system are designed such that said drain system is draining said lube oil sufficiently under a rotation of said oil bearing (OB) along said axis (x) up to 37.5°

.

5. The oil bearing (OB) according to claim 1,

wherein said oil sump (OS) and said drain system are designed such that said drain system is draining said lube oil sufficiently under rotation of said oil bearing (OB) perpendicular to said axis (x) up to 12.5°

.

6. A gas turbine (GT) comprising:

an oil bearing (OB) according to claim 1,

wherein said gas turbine (GT) comprises a gas turbine exhaust (EX),

wherein said oil bearing is located in said exhaust (EX) and supported by at least three struts (STR), comprising

a first strut (STR1) located at 4;

30 of an axial cross section,

a second strut (STR2) located between 5;

30 and 6;

30 of an axial cross section and

a third strut (STR3) located between 7 o'"'"'clock and 8 o'"'"'clock of an axial cross section,

wherein all these struts (STR) are extending radially.

7. The oil bearing (OB) according to claim 1,

wherein the turbine comprises a gas turbine.