JP2010216522A - Double-arc bearing lubricating oil system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reliable double-arc bearing lubricating oil system capable of reducing the bearing loss in ordinary operation, and capable of sufficiently securing lubrication between a rotating shaft and a bearing in an emergency such as an earthquake. <P>SOLUTION: The double-arc bearing lubricating oil system 2 includes a double-arc bearing 9 having an upper half bearing 33 and a lower half bearing 34, a main lubricating oil pump 13 or a starting lubricating oil pump 14 for supplying lubricating oil 17 to a sliding surface 35, and vibration detection parts 28 and 29 for detecting vibration applied to a steam turbine rotor 8 and the double-arc bearing 9. A first oil communication hole 40 is provided in a region from a rotation downstream end 35ab of an upper half sliding surface 35a to a rotation upstream end 35ba of a lower half sliding surface 35b, and a second oil communication hole 41 is provided on the downstream side compared to a rotation downstream end 35bb of the lower half sliding surface 35b. When the vibration detected by the vibration detection parts 28 and 29 is equal to or higher than the prescribed value, the lubricating oil 17 is supplied through the first oil communication hole 40 and the second oil communication hole 41. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dual arc shaft lubricating oil system.

  Steam turbines installed in power generation facilities such as nuclear power plants and thermal power plants need to continuously and stably supply lubricating oil to turbine bearings for the purpose of protecting the steam turbine. Therefore, a lubricating oil system is provided in the power generation facility.

  On the other hand, a turbine bearing that rotatably supports a steam turbine is generally composed of a two-arc bearing divided into two on a plane passing through the rotation axis of the steam turbine.

  FIG. 16 is a front view showing a schematic configuration of a conventional dual arc bearing lubricating oil system.

  17 and 18 are cross-sectional views showing a schematic configuration of a conventional two-arc bearing lubricating oil system.

  As shown in FIGS. 16 to 18, the conventional dual arc bearing 71 includes an upper half bearing 72 and a lower half bearing 73. The upper half bearing 72 and the lower half bearing 73 are divided by a substantially horizontal dividing plane P passing through the rotation axis with respect to a rotation shaft 74 of a rotary machine such as a steam turbine disposed substantially horizontally. The two-arc bearing 71 has notched pockets 77 and 78 on the side of the sliding surface 75 with respect to the rotating shaft 74, that is, on the inner peripheral surface and in the vicinity of the dividing surface. In this example, the pockets 77 and 78 are formed over both the upper half bearing 72 and the lower half bearing 73. With the pockets 77 and 78 as a boundary, the sliding surface 75 between the rotating shaft 74 and the upper half bearing 72 is called an upper half sliding surface 75a, and the sliding surface 75 between the rotating shaft 74 and the lower half bearing 73 is the lower half. This is called a sliding surface 75b.

  The upper half bearing 72 has an overshot groove 799 that reduces the frictional force between the rotating shaft 74 and the upper half sliding surface 75a. The overshot groove 79 forms a gap between the rotating shaft 74 and the upper half sliding surface 75a, and reduces bearing loss due to the viscosity of the lubricating oil.

  On the other hand, the lower half bearing 73 has an oil supply hole 76 that guides lubricating oil from the outer peripheral side of the double arc bearing 71 to the pocket 77.

  The rotating shaft 74 is rotated in the direction reaching the pocket 78 while the lubricating oil supplied to the pocket 77 lubricates the rotating shaft 74 and the lower half sliding surface 75b (solid arrow R in FIG. 16). When the rotary machine is operated and the rotary shaft 74 is rotated, the lubricating oil is supplied to the pocket 77 through the oil supply hole 76, spreads in the pocket 77 in the axial direction of the rotary shaft 74, and then the rotary shaft 74 and the lower half. It enters the clearance of the sliding surface 75b. The lubricating oil entering this gap has an increased oil film pressure, and the rotating shaft 74 is supported by the oil film pressure. A part of the lubricating oil supplied from the oil supply hole 76 is discharged from the axial end of the lower half bearing 73 to the outside of the bearing when passing through the lower half sliding surface 75 b, and the other part is passed through the pocket 78 to the upper half sliding. It reaches the moving surface 75a.

  Therefore, during normal operation of the rotary machine, the upper half bearing 72 does not contribute to the support of the rotary shaft 74, and the necessity for lubrication between the rotary shaft 74 and the upper half sliding surface 75a is low.

  Therefore, the conventional dual arc bearing 71 is provided with weir portions 80 at the upstream end and the downstream end of the overshot groove 79 to prevent the lubricating oil from entering the overshot groove 79 from the pockets 77 and 78, Lubricating oil between the upper half sliding surface 75a is actively reduced to reduce bearing loss due to the viscosity of the lubricating oil (see, for example, Patent Document 1).

Actual Kosho 63-18832

  The upper half bearing of the two-arc bearing does not contribute to the support of the rotating shaft during normal operation of the rotating machine.

  However, the upper half bearing functions as an anti-sway of the rotating shaft when the rotating shaft vibrates with a large amplitude (for example, an amplitude of about 0.1 mmp-p) due to an earthquake or the like. At this time, in the conventional two-arc bearing, most of the lubricating oil does not reach the upper half sliding surface due to the weir, and the rotating shaft and the upper half sliding surface are connected to each other through some lubricating oil adhering to the surface of the rotating shaft. Slides. In such a situation, lubrication between the rotating shaft and the upper half sliding surface becomes unstable, and if the lubrication is insufficient, the rotating shaft and the upper half sliding surface may be in direct contact with each other.

  The present invention proposes a highly reliable dual-arc bearing lubricating oil system capable of reducing bearing loss during normal operation and sufficiently ensuring lubrication between the rotating shaft and the bearing in an emergency such as an earthquake.

  In order to solve the above-described problems, the present invention provides a two-arc bearing having a first oil passage hole and a second oil passage hole, which includes a lower half bearing portion and an upper half bearing, and a rotary shaft. And a lubricating oil supply source for supplying lubricating oil to the sliding surface of the two-arc bearing, and a vibration detector for detecting vibration applied to the rotating shaft and the two-arc bearing, The oil hole is provided in a range from the rotation downstream end of the upper half sliding surface to the rotation upstream end of the lower half sliding surface, and the second oil passage hole is downstream of the rotation downstream end of the lower half sliding surface. When the vibration detected by the vibration detecting unit is less than a predetermined value, the lubricating oil is supplied from the lubricating oil supply source through the first oil passage hole and detected by the vibration detecting unit. If the vibration is greater than or equal to the predetermined value, the lubricating oil supply source passes through the first oil passage hole and the second oil passage hole. And supplying the lubricating oil.

  ADVANTAGE OF THE INVENTION According to this invention, while reducing the bearing loss at the time of a normal driving | operation, the highly reliable two-arc bearing lubricating oil system which can fully ensure lubrication with a rotating shaft and a bearing at the time of emergency, such as an earthquake, can be provided.

1 is a system diagram showing a dual arc bearing lubricating oil system according to a first embodiment of the present invention configured as a power generation facility. FIG. The schematic front view which showed the principal part of the two-arc bearing lubricating oil system which concerns on 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS Schematic sectional drawing which showed the principal part of the double arc bearing lubricating oil system which concerns on 1st Embodiment of this invention. The schematic front view which showed the other example of the principal part of the double arc bearing lubricating oil system which concerns on 1st Embodiment of this invention. The schematic sectional drawing which showed the other example of the principal part of the two-arc bearing lubricating oil system which concerns on 1st Embodiment of this invention. The schematic front view which showed the principal part of the two-arc bearing lubricating oil system which concerns on 2nd Embodiment of this invention. The schematic sectional drawing which showed the principal part of the two-arc bearing lubricating oil system which concerns on 2nd Embodiment of this invention. The schematic front view which showed the principal part of the two-arc bearing lubricating oil system which concerns on 3rd Embodiment of this invention. The schematic front view which showed the principal part of the two-arc bearing lubricating oil system which concerns on 4th Embodiment of this invention. The schematic front view which showed the principal part of the two-arc bearing lubricating oil system which concerns on 5th Embodiment of this invention. The schematic front view which showed the principal part of the two-arc bearing lubricating oil system which concerns on 5th Embodiment of this invention. The schematic front view which showed the principal part of the two-arc bearing lubricating oil system which concerns on 6th Embodiment of this invention. The schematic front view which showed the principal part of the two-arc bearing lubricating oil system which concerns on 6th Embodiment of this invention. The schematic front view which showed the principal part of the two-arc bearing lubricating oil system which concerns on 7th Embodiment of invention. The schematic sectional drawing which showed the principal part of the two-arc bearing lubricating oil system which concerns on 7th Embodiment of this invention. The front view which showed the schematic structure of the conventional dual arc bearing lubricating oil system. Sectional drawing which showed the schematic structure of the conventional dual arc bearing lubricating oil system. Sectional drawing which showed the schematic structure of the conventional dual arc bearing lubricating oil system.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a dual arc bearing lubricating oil system according to the present invention will be described with reference to the drawings.

[First Embodiment]
A first embodiment of a dual arc bearing lubricating oil system according to the present invention will be described with reference to FIGS.

  FIG. 1 is a system diagram showing a dual arc bearing lubricating oil system according to a first embodiment of the present invention configured as a power generation facility.

  As shown in FIG. 1, the power generation facility 1 is an example of a facility provided with a two-arc bearing lubricating oil system 2 and is used, for example, in a nuclear power plant or a thermal power plant. The power generation facility 1 includes a steam generation unit 3, a steam turbine 4, a generator 5, and a two-arc bearing lubricating oil system 2.

  The steam generating unit 3 is, for example, a nuclear power plant nuclear reactor or a thermal power plant boiler, and generates steam as a working fluid of the steam turbine 4. The steam generated by the steam generator 3 is sent to the steam turbine 4.

  The steam turbine 4 includes a steam turbine rotor 8 (rotary shaft), and the steam turbine rotor 8 is rotatably supported by a two-arc bearing 9 that is a turbine bearing. The steam turbine 4 is rotationally driven by the steam supplied from the steam generating unit 3. The rotational driving force of the steam turbine 4 is transmitted to the generator 5.

  The generator 5 is rotationally driven by the steam turbine 4 via the steam turbine rotor 8 to generate power.

  The two-arc bearing lubricating oil system 2 includes an oil tank 11, a hydraulic pipe 12 (lubricating oil pipe), a main lubricating oil pump 13 (first lubricating oil pump) and a starting lubricating oil pump 14 ( A second lubricating oil pump), a DC motor 16, and a two-arc bearing 9. The two-arc bearing lubricant system 2 supplies the lubricant 17 stored in the oil tank 11 to the two-arc bearing 9.

  The oil tank 11 stores the lubricating oil 17 supplied to the dual arc bearing 9.

  The hydraulic piping 12 includes a lubricating oil supply piping system 18 that guides the lubricating oil 17 stored in the oil tank 11 to the dual arc bearing 9, and a lubricating oil that returns the lubricating oil 17 after lubricating the dual arc bearing 9 to the oil tank 11. A return piping system 19.

  The main lubricating oil pump 13 is disposed in the lubricating oil supply piping system 18. The main lubricating oil pump 13 is directly connected to the steam turbine rotor 8 and driven. The lubricating oil 17 discharged from the main lubricating oil pump 13 is guided to the oil turbine 20 disposed in the oil tank 11 through the lubricating oil supply piping system 18, and after driving the oil turbine 20, two arcs Guided to the bearing 9. The oil turbine 20 drives a booster oil pump 21 disposed in the oil tank 11. The booster oil pump 21 pressurizes the lubricating oil 17 in the oil tank 11 and supplies it as suction oil for the main lubricating oil pump 13.

  The starting lubricating oil pump 14 is disposed in the lubricating oil supply piping system 18. The starting lubricating oil pump 14 is directly connected to and driven by the DC motor 16. The DC motor 16 is connected to a DC power source (not shown). The DC motor 16 is turned on / off by the pressure switch 22 and is activated when the oil pressure of the lubricating oil supply piping system 18 is lower than the oil pressure necessary for the lubrication of the dual arc bearing 9, and drives the starting lubricating oil pump 14.

  The dual arc bearing lubricating oil system 2 generates a flow of lubricating oil 17 with the steam turbine rotor 8 as a drive shaft in a load operation state of the steam turbine 4. That is, the lubricating oil 17 is discharged from the main lubricating oil pump 13 by driving the steam turbine rotor 8, drives the oil turbine 20, and then is supplied to the dual arc bearing 9 through the lubricating oil supply piping system 18. The lubricating oil 17 after lubricating the two-arc bearing 9 passes through the lubricating oil return piping system 19 and is again collected in the oil tank 23. On the other hand, the stored oil in the oil tank 23 becomes suction oil for the main lubricating oil pump 13 by a booster oil pump 26 driven by the oil turbine 20.

  On the other hand, the dual-arc bearing lubricating oil system 2 is used when the rotational speed of the steam turbine rotor 8 is not sufficient during the start-up and stop processes of the steam turbine 4 and the main lubricating oil pump 13 still does not sufficiently function or for some reason. When the oil pressure of the lubricating oil is reduced by the above, the lubricating oil 17 is supplied to the dual arc bearing 9 by the starting lubricating oil pump 14 instead of the main lubricating oil pump 13.

  FIG. 2 is a schematic front view showing a main part of the dual arc bearing lubricating oil system according to the first embodiment of the present invention.

  FIG. 3 is a schematic cross-sectional view showing a main part of the dual arc bearing lubricating oil system according to the first embodiment of the present invention.

  As shown in FIGS. 2 and 3, the two-arc bearing lubricating oil system 2 includes a hydraulic pipe 12, a main lubricating oil pump 13 or a starting lubricating oil pump 14, a two-arc bearing 9, a gate valve 27, vibrations. Detection units 28 and 29 and a control unit 31 are provided.

  The double arc bearing 9 is composed of an upper half bearing 33 and a lower half bearing 34. The upper half bearing 33 and the lower half bearing 34 are divided by a substantially horizontal dividing plane P passing through the rotation axis with respect to the steam turbine rotor 8 arranged substantially horizontally. The two-arc bearing 9 has notched pockets 36 and 37 in the vicinity of the dividing surface P on the sliding surface 35 side with the steam turbine rotor 8, that is, on the inner peripheral surface. The pockets 36 and 37 are formed over both the upper half bearing 33 and the lower half bearing 34.

  The upper half bearing 33 has an overshot groove 38 that reduces the frictional force between the steam turbine rotor 8 and the upper half sliding surface 35a. The overshot groove 38 forms a gap between the steam turbine rotor 8 and the upper half sliding surface 35 a and reduces bearing loss due to the viscosity of the lubricating oil 17.

  On the other hand, the lower half bearing 34 has a first oil passage hole 40 and a second oil passage hole 41 that guide the lubricating oil 17 from the outer peripheral side of the dual arc bearing 9.

  Here, the steam turbine rotor 8 is rotated in a direction in which the lubricating oil 17 supplied to the pocket 36 reaches the pocket 37 while lubricating the steam turbine rotor 8 and the lower half sliding surface 35b (solid line in FIG. 2). Arrow R).

  The first oil passage hole 40 is provided in a range from the rotation downstream end 35ab of the upper half sliding surface 35a to the rotation upstream end 35ba of the lower half sliding surface 35b. Specifically, the first oil passage hole 40 communicates with the pocket 36 from the outer peripheral side of the double arc bearing 9.

  The second oil passage hole 41 is provided on the downstream side of the rotation downstream end 35bb of the lower half sliding surface 35b and in a range reaching the rotation downstream end 35ab of the upper half sliding surface 35a.

  The gate valve 27 is provided in the lubricating oil supply piping system 18 of the hydraulic piping 12 and opens and closes the flow path between the main lubricating oil pump 13 or the starting lubricating oil pump 14 and the second oil passage hole 41.

  The vibration detection unit 28 is provided in the two-arc bearing 9 and detects vibration applied to the steam turbine rotor 8 and the two-arc bearing 9. The vibration detection unit 28 is configured by using, for example, displacement meters 28a and 28b, and detects vibration by measuring a relative displacement between the steam turbine rotor 8 and the two-arc bearing 9. The displacement meters 28 a and 28 b measure relative displacement between the steam turbine rotor 8 and the two-arc bearing 9 in two directions orthogonal to each other on a plane orthogonal to the rotation axis of the steam turbine rotor 8.

  The vibration detection unit 29 is provided at the base 43 where the two-arc bearing 9 is installed, and detects vibration applied to the steam turbine rotor 8 and the two-arc bearing 9. The vibration detection unit 29 is configured using, for example, an accelerometer, and detects vibration by measuring the acceleration of the base 43.

  When the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 is less than a predetermined value, the control unit 31 causes the pocket 36 to pass through the first oil hole 40 from the main lubricating oil pump 13 or the starting lubricating oil pump 14. On the other hand, when the vibration detected by the vibration detecting unit 28 or the vibration detecting unit 29 is equal to or greater than a predetermined value, the first oil passing from the main lubricating oil pump 13 or the starting lubricating oil pump 14 is performed. The lubricating oil 17 is supplied to the pocket 37 through the hole 40 and the second oil passage hole 41.

  Specifically, the control unit 31 receives the vibration measurement value detected by the vibration detection units 28 and 29 as an input, and when the vibration measurement value is less than a predetermined value set in advance, the gate valve 27 On the other hand, if the measured value of vibration is equal to or greater than a predetermined value, an open signal is output to the gate valve 27.

  More specifically, the control unit 31 detects the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 and a predetermined vibration amplitude (predetermined value) or predetermined vibration acceleration (predetermined value) set in advance. When the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 is less than a predetermined vibration amplitude or a predetermined vibration acceleration, the gate valve 27 is closed and the main lubricating oil pump 13 or the starting lubricating oil is closed. The lubricating oil 17 supplied from the pump 14 to the second oil passage hole 41 is shut off. At this time, the lubricating oil 17 supplied from the main lubricating oil pump 13 or the starting lubricating oil pump 14 to the first oil passage hole 40 is continuously sent.

  On the other hand, when the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 is greater than or equal to a predetermined vibration amplitude or a predetermined vibration acceleration, the control unit 31 opens the gate valve 27 to start the main lubricant pump 13 or the start-up oil. The lubricating oil 17 is supplied from the lubricating oil pump 14 to the first oil passage hole 40 and the second oil passage hole 41.

  FIG. 4 is a schematic front view showing another example of the main part of the dual arc bearing lubricating oil system according to the first embodiment of the present invention.

  FIG. 5 is a schematic cross-sectional view showing another example of the main part of the dual arc bearing lubricating oil system according to the first embodiment of the present invention.

  4 and 5, the two-arc bearing 9 of the two-arc bearing lubricating oil system 2 is provided with the second oil passage hole 41 in the upper half bearing 33, and the steam turbine rotor 8, the upper half sliding surface 35a, and the like. The lubricating oil 17 may be directly supplied between the two. In this case, the second oil passage hole 41 is preferably arranged closer to the pocket 37 than the vicinity of the top of the upper half bearing 33 where the gap between the steam turbine rotor 8 and the upper half sliding surface 35a becomes large.

  The dual-arc bearing lubricating oil system 2 configured as described above sends a command from the control unit 31 to close the gate valve 27 and closes the gate valve 27 from the main lubricating oil pump 13 in the normal load operation state of the steam turbine 4. The lubricating oil 17 is supplied to the pocket 36 through 40. The lubricating oil 17 supplied to the pocket 36 spreads in the pocket 36 in the axial direction of the steam turbine rotor 8 and then enters the gap between the steam turbine rotor 8 and the lower half sliding surface 35b. The lubricating oil 17 that has entered this gap has an increased oil film pressure, and the steam turbine rotor 8 is supported by this oil film pressure. Part of the lubricating oil 17 supplied from the first oil passage hole 40 is discharged from the axial end of the lower half bearing 34 to the outside of the bearing when passing through the lower half sliding surface 35 b, and the other part is put into the pocket 37. It reaches.

  On the other hand, when the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 exceeds a predetermined vibration amplitude or a predetermined vibration acceleration due to an earthquake or the like, the dual-arc bearing lubricating oil system 2 issues a command from the control unit 31. To open the gate valve 27. Then, the dual-arc bearing lubricating oil system 2 supplies the lubricating oil 17 from the main lubricating oil pump 13 to the pocket 36 through the first oil passage hole 40, and the pocket 37 from the main lubricating oil pump 13 through the second oil passage hole 41. Lubricating oil 17 is supplied. The lubricating oil 17 supplied to the pocket 36 lubricates the gap between the steam turbine rotor 8 and the lower half sliding surface 35b, while the lubricating oil 17 supplied to the pocket 37 passes between the steam turbine rotor 8 and the upper half sliding surface. Enter the gap with the moving surface 35a. At this time, if the main lubricating oil pump 13 cannot sufficiently function, the dual-arc bearing lubricating oil system 2 supplies the lubricating oil 17 by the starting lubricating oil pump 14 instead of the main lubricating oil pump 13. .

  Therefore, the two-arc bearing lubricating oil system 2 according to the present embodiment does not supply the lubricating oil 17 to the gap between the steam turbine rotor 8 and the upper half sliding surface 35a in the normal load operation state of the steam turbine 4. The bearing loss generated between the steam turbine rotor 8 and the upper half sliding surface 35a can be reduced.

  Further, the two-arc bearing lubricating oil system 2 supplies the lubricating oil 17 to the gap between the steam turbine rotor 8 and the upper half sliding surface 35a in an emergency such as an earthquake, so that the steam turbine rotor 8 and the upper half sliding surface are supplied. Effects such as temperature reduction of 35a, vibration reduction by damping of the oil film, and frictional force reduction by increasing the oil film thickness can be obtained, and the reliability of the steam turbine rotor 8 and the double arc bearing 9 can be improved.

[Second Embodiment]
A second embodiment of the dual-arc bearing lubricant system according to the present invention will be described with reference to FIGS.

  FIG. 6 is a schematic front view showing a main part of a dual arc bearing lubricating oil system according to a second embodiment of the present invention.

  FIG. 7 is a schematic cross-sectional view showing a main part of a dual arc bearing lubricating oil system according to a second embodiment of the present invention.

  Note that in this embodiment, the same reference numerals are given to the same components as those in the first embodiment, and duplicate descriptions are omitted.

  As shown in FIGS. 6 and 7, the two-arc bearing lubricating oil system 2 </ b> A according to this embodiment is a lubricating oil communicated with a lubricating oil supply piping system 18 between the gate valve 27 and the second oil passage hole 41. A discharge pipe 46, a discharge pipe gate valve 47 provided in the lubricating oil discharge pipe 46, and a control unit 31A are provided.

  The lubricating oil discharge pipe 46 is connected to the lubricating oil return pipe system 19, and when the gate valve 27 is closed and the discharge pipe gate valve 47 is opened, the oil tank 11 passes from the pocket 37 to the oil tank 11 through the second oil passage hole 41. Return the lubricating oil 17.

  When the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 is less than a predetermined value, the control unit 31A detects the pocket 36 from the main lubricating oil pump 13 or the starting lubricating oil pump 14 through the first oil passage hole 40. Is supplied to the steam turbine rotor 8 and the lower half sliding surface 35b, and the lubricating oil 17 sent to the pocket 37 is lubricated through the lubricating oil discharge pipe 46 from the second oil passage hole 41. Send to oil return piping system 19.

  On the other hand, when the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 is equal to or greater than a predetermined value, the control unit 31A starts from the main lubricating oil pump 13 or the starting lubricating oil pump 14 and the first oil passage hole 40 and The lubricating oil 17 is supplied to the pocket 37 through the second oil passage hole 41.

  Specifically, the control unit 31A receives the vibration measurement value detected by the vibration detection units 28 and 29 as an input, and when the vibration measurement value is less than a predetermined value set in advance, the gate valve 27 A close signal is output to the discharge pipe gate valve 47, and an open signal is output to the discharge pipe gate valve 47. On the other hand, if the measured vibration value is equal to or greater than a predetermined value, an open signal is output to the gate valve 27, and A close signal is output to the discharge piping gate valve 47.

  More specifically, first, the control unit 31A performs the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 and a predetermined vibration amplitude (predetermined value) or a predetermined vibration acceleration (predetermined value). Value).

  When the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 is less than a predetermined vibration amplitude or a predetermined vibration acceleration, the gate valve 27 is closed and the main lubricating oil pump 13 or the starting lubricating oil pump 14 is turned off. The lubricating oil 17 supplied to the second oil passage hole 41 is shut off, the discharge piping gate valve 47 is opened, the steam turbine rotor 8 and the lower half sliding surface 35b are lubricated, and the lubricating oil sent to the pocket 37 17 is sent from the second oil passage hole 41 to the oil tank 11 through the lubricant discharge pipe 46 and the lubricant return pipe system 19. At this time, the lubricating oil 17 supplied from the main lubricating oil pump 13 or the starting lubricating oil pump 14 to the first oil passage hole 40 is continuously sent.

  On the other hand, the control unit 31A opens the gate valve 27 and closes the discharge pipe gate valve 47 when the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 is greater than or equal to a predetermined vibration amplitude or a predetermined vibration acceleration. The lubricating oil 17 is supplied from the main lubricating oil pump 13 or the starting lubricating oil pump 14 to the first oil passing hole 40 and the second oil passing hole 41.

  The two-arc bearing lubricating oil system 2A configured as described above sends a command from the control unit 31A to close the gate valve 27 and open the discharge pipe gate valve 47 in the normal load operation state of the steam turbine 4 to open the main lubrication system. The lubricating oil 17 is supplied from the oil pump 13 to the pocket 36 through the first oil passage hole 40. The lubricating oil 17 supplied to the pocket 36 spreads in the pocket 36 in the axial direction of the steam turbine rotor 8 and then enters the gap between the steam turbine rotor 8 and the lower half sliding surface 35b. The lubricating oil 17 that has entered this gap has an increased oil film pressure, and the steam turbine rotor 8 is supported by this oil film pressure. Part of the lubricating oil 17 supplied from the first oil passage hole 40 is discharged from the axial end of the lower half bearing 34 to the outside of the bearing when passing through the lower half sliding surface 35 b, and the other part is put into the pocket 37. It reaches. The lubricating oil 17 that has reached the pocket 37 is returned to the oil tank 11 through the second oil passage hole 41, through the lubricating oil discharge pipe 46 and the lubricating oil return pipe system 19.

  On the other hand, when the vibration detected by the vibration detecting unit 28 or the vibration detecting unit 29 becomes a predetermined vibration amplitude or a predetermined vibration acceleration or more due to an earthquake or the like, the dual arc bearing lubricating oil system 2A receives a command from the control unit 31A. The gate valve 27 is opened and the discharge pipe gate valve 47 is closed. Then, the two-arc bearing lubricating oil system 2A supplies the lubricating oil 17 from the main lubricating oil pump 13 to the pocket 36 through the first oil passage hole 40, and the pocket 37 from the main lubricating oil pump 13 through the second oil passage hole 41. Lubricating oil 17 is supplied. The lubricating oil 17 supplied to the pocket 36 lubricates the gap between the steam turbine rotor 8 and the lower half sliding surface 35b, while the lubricating oil 17 supplied to the pocket 37 passes between the steam turbine rotor 8 and the upper half sliding surface. Enter the gap with the moving surface 35a. At this time, the two-arc bearing lubricating oil system 2A supplies the lubricating oil 17 by the starting lubricating oil pump 14 instead of the main lubricating oil pump 13 when the main lubricating oil pump 13 cannot sufficiently function. .

  Therefore, the two-arc bearing lubricating oil system 2A according to the present embodiment does not supply the lubricating oil 17 to the gap between the steam turbine rotor 8 and the upper half sliding surface 35a in the normal load operation state of the steam turbine 4. The bearing loss generated between the steam turbine rotor 8 and the upper half sliding surface 35a can be reduced.

  Further, in the two-arc bearing lubricating oil system 2A, in the normal load operation state of the steam turbine 4, the lubricating oil 17 after lubricating the steam turbine rotor 8 and the lower half sliding surface 35b is transferred from the pocket 37 to the oil tank 11. Is positively reduced to reduce the lubricating oil 17 entering the gap between the steam turbine rotor 8 and the upper half sliding surface 35a as much as possible, and is generated between the steam turbine rotor 8 and the upper half sliding surface 35a. Bearing loss can be greatly reduced.

  Further, the two-arc bearing lubricating oil system 2A supplies the lubricating oil 17 to the gap between the steam turbine rotor 8 and the upper half sliding surface 35a in an emergency such as an earthquake, and the steam turbine rotor 8 and the upper half sliding surface. Effects such as temperature reduction of 35a, vibration reduction by damping of the oil film, and frictional force reduction by increasing the oil film thickness can be obtained, and the reliability of the steam turbine rotor 8 and the double arc bearing 9 can be improved.

[Third Embodiment]
A third embodiment of the dual-arc bearing lubricating oil system according to the present invention will be described with reference to FIG.

  FIG. 8 is a schematic front view showing a main part of a dual arc bearing lubricating oil system according to a third embodiment of the present invention.

  Note that in this embodiment, the same reference numerals are given to the same components as those in the first embodiment, and duplicate descriptions are omitted.

  As shown in FIG. 8, the two-arc bearing lubricating oil system 2B according to this embodiment includes a main lubricating oil pump 13 (first lubricating oil pump), a starting lubricating oil pump 14 (second lubricating oil pump), The start gate valve 49 and the control part 31B are provided.

  The main lubricating oil pump 13 and the starting lubricating oil pump 14 are provided in the lubricating oil supply piping system 18 and are arranged in parallel with each other.

  The start gate valve 49 opens and closes the flow path between the start lubricating oil pump 14 and the first oil passage hole 40. The start gate valve 49 is used when the rotation speed of the steam turbine rotor 8 is not sufficient during the start and stop processes of the steam turbine 4 and the main lubricating oil pump 13 still does not function sufficiently, or for some reason. Is opened when the hydraulic pressure decreases, and the flow path between the starting lubricating oil pump 14 and the two-arc bearing 9 is communicated. In other cases, the start gate valve 49 is closed.

  When the vibration detected by the vibration detector 28 or the vibration detector 29 is less than a predetermined value, the controller 31B supplies the lubricant 17 to the pocket 36 from the main lubricant pump 13 through the first oil passage hole 40. .

  On the other hand, when the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 is equal to or greater than a predetermined value, the control unit 31B applies the lubricant 17 from the main lubricant pump 13 to the pocket 36 through the first oil passage hole 40. While being supplied, the lubricating oil 17 is supplied from the starting lubricating oil pump 14 to the pocket 37 through the second oil passage hole 41.

  Further, the control unit 31B is preset with a second predetermined value smaller than the predetermined value. When the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 reaches the second predetermined value, the control unit 31B starts to drive the start-up lubricant pump 14.

  Specifically, the control unit 31B receives the vibration measurement value detected by the vibration detection units 28 and 29 as an input, and when the vibration measurement value is less than a predetermined value set in advance, the gate valve 27 On the other hand, if the measured value of vibration is equal to or greater than a predetermined value, an open signal is output to the gate valve 27.

  In addition, the control unit 31B detects the lubricating oil 17 when the rotation speed of the steam turbine rotor 8 is not sufficient during the start-up process or the stop process of the steam turbine 4 and the main lubricating oil pump 13 still does not function sufficiently, or for some reason. When the hydraulic pressure is reduced, the starting gate valve 49 is opened. In other cases, for example, in the normal load operation state of the steam turbine 4, the starting gate valve 49 is closed.

  More specifically, first, the control unit 31B determines whether the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 and a preset second predetermined vibration amplitude (second predetermined value) or first value. The second predetermined vibration acceleration (second predetermined value) is compared.

  When the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 reaches the second predetermined vibration amplitude or the second predetermined vibration acceleration, the control unit 31B starts driving the starter lubricating oil pump 14. Let At this time, if the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 is less than a predetermined vibration amplitude or a predetermined vibration acceleration, the control unit 31B closes the gate valve 27 and starts the start-up lubricant pump 14. The lubricating oil 17 supplied to the second oil passage hole 41 is shut off.

  On the other hand, if the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 is equal to or greater than a predetermined vibration amplitude or a predetermined vibration acceleration, the control unit 31B maintains the drive of the start lubricating oil pump 14 and The valve 27 is opened and the lubricating oil 17 is supplied from the main lubricating oil pump 13 to the first oil passage hole 40, and the lubricating oil 17 is supplied from the starting lubricating oil pump 14 to the second oil passage hole 41.

  The double arc bearing 9 is configured such that the second oil passage hole 41 is provided in the upper half bearing 33 and the lubricating oil 17 is directly supplied between the steam turbine rotor 8 and the upper half sliding surface 35a. You can also.

  In the two-arc bearing lubricating oil system 2B configured as described above, in a normal load operation state of the steam turbine 4, a command is sent from the control unit 31B to close the gate valve 27 and the main lubricating oil pump 13 to the first oil passage hole. The lubricating oil 17 is supplied to the pocket 36 through 40. The lubricating oil 17 supplied to the pocket 36 spreads in the pocket 36 in the axial direction of the steam turbine rotor 8 and then enters the gap between the steam turbine rotor 8 and the lower half sliding surface 35b. The lubricating oil 17 that has entered this gap has an increased oil film pressure, and the steam turbine rotor 8 is supported by this oil film pressure. Part of the lubricating oil 17 supplied from the first oil passage hole 40 is discharged from the axial end of the lower half bearing 34 to the outside of the bearing when passing through the lower half sliding surface 35 b, and the other part is put into the pocket 37. It reaches.

  On the other hand, when the vibration detected by the vibration detecting unit 28 or the vibration detecting unit 29 reaches the second predetermined vibration amplitude or the second predetermined vibration acceleration due to an earthquake or the like, the dual arc bearing lubricating oil system 2B The drive of the starting lubricating oil pump 14 is started. When the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 exceeds a predetermined vibration amplitude or a predetermined vibration acceleration due to an earthquake or the like, the dual-arc bearing lubricant system 2B 14, a command is sent from the control unit 31 </ b> B, and the gate valve 27 is opened. Then, the dual-arc bearing lubricating oil system 2B supplies the lubricating oil 17 from the main lubricating oil pump 13 to the pocket 36 through the first oil passage hole 40 and from the starting lubricating oil pump 14 to the pocket through the second oil passage hole 41. The lubricating oil 17 is supplied to 37. The lubricating oil 17 supplied to the pocket 36 lubricates the gap between the steam turbine rotor 8 and the lower half sliding surface 35b, while the lubricating oil 17 supplied to the pocket 37 passes between the steam turbine rotor 8 and the upper half sliding surface. Enter the gap with the moving surface 35a. At this time, if the main lubricating oil pump 13 cannot sufficiently function, the lubricating oil 17 is supplied to the pockets 36 and 37 by the starting lubricating oil pump 14 instead of the main lubricating oil pump 13.

  Therefore, the two-arc bearing lubricating oil system 2B according to the present embodiment does not supply the lubricating oil 17 to the gap between the steam turbine rotor 8 and the upper half sliding surface 35a in the normal load operation state of the steam turbine 4. The bearing loss generated between the steam turbine rotor 8 and the upper half sliding surface 35a can be reduced.

  Further, the two-arc bearing lubricating oil system 2B supplies the lubricating oil 17 to the gap between the steam turbine rotor 8 and the upper half sliding surface 35a in an emergency such as an earthquake, and the steam turbine rotor 8 and the upper half sliding surface. Effects such as temperature reduction of 35a, vibration reduction by damping of the oil film, and frictional force reduction by increasing the oil film thickness can be obtained, and the reliability of the steam turbine rotor 8 and the double arc bearing 9 can be improved.

  Further, the dual-arc bearing lubricant system 2B starts driving the start-up lubricant pump 14 when the vibrations of the steam turbine rotor 8 and the dual-arc bearing 9 reach a second predetermined value in an emergency such as an earthquake. Then, by preparing to supply the lubricating oil 17 to the gap between the steam turbine rotor 8 and the upper half sliding surface 35a, lubrication between the steam turbine rotor 8 and the upper half sliding surface 35a becomes necessary. The supply of the lubricating oil 17 can be started immediately.

  Furthermore, the dual-arc bearing lubricating oil system 2B can effectively utilize the starting lubricating oil pump 14 that has been conventionally used for starting as a lubricating oil supply source in an emergency.

[Fourth Embodiment]
A fourth embodiment of the dual-arc bearing lubricating oil system according to the present invention will be described with reference to FIG.

  FIG. 9 is a schematic front view showing a main part of a dual arc bearing lubricating oil system according to a fourth embodiment of the present invention.

  Note that in this embodiment, the same reference numerals are given to the same components as those in the fourth embodiment, and duplicate descriptions are omitted.

  As shown in FIG. 9, the two-arc bearing lubricating oil system 2C according to the present embodiment includes a main lubricating oil pump 13 (lubricating oil pump) or a starting lubricating oil pump 14 (lubricating oil pump) as a lubricating oil supply source. An emergency oil tank 51 (lubricating oil tank) which is a lubricating oil supply source, an emergency lubricating oil supply pipe 52 which communicates the emergency oil tank 51 with the second oil passage hole 41 of the dual arc bearing 9, and an emergency A gate valve 53 provided in the lubricating oil supply pipe 52 and a control unit 31C are provided.

  The emergency oil tank 51 stores the emergency lubricating oil 54 and is provided at a position higher than the pocket 37 of the dual arc bearing 9, and is configured to be able to supply the emergency lubricating oil 54 to the pocket 37 due to a difference in potential energy. The The stored oil capacity of the emergency oil tank 51 stores an amount of emergency lubricating oil 54 necessary for lubrication between the steam turbine rotor 8 and the upper half sliding surface 35a in an emergency such as an earthquake.

  The gate valve 53 opens and closes the flow path between the emergency oil tank 51 and the second oil passage hole 41.

  When the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 is less than a predetermined value, the control unit 31C closes the gate valve 53 and connects the emergency oil tank 51 and the second oil passage hole 41 to each other. Block the flow path.

  On the other hand, when the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 is equal to or greater than a predetermined value, the control unit 31C opens the gate valve 53 and opens the pocket from the emergency oil tank 51 through the second oil passage hole 41. 37 is supplied with emergency lubricating oil 54.

  Specifically, the control unit 31C receives as input the vibration measurement values detected by the vibration detection units 28 and 29, and when the vibration measurement value is less than a predetermined value set in advance, the gate valve 53 On the other hand, if the measured value of vibration is equal to or greater than a predetermined value, an open signal is output to the gate valve 27.

  In the double-arc bearing 9, the second oil passage hole 41 is provided in the upper half bearing 33 so that the emergency lubricating oil 54 is directly supplied between the steam turbine rotor 8 and the upper half sliding surface 35a. It can also be configured.

  The two-arc bearing lubricating oil system 2 </ b> C configured as described above sends a command from the control unit 31 </ b> C to close the gate valve 53 and the first lubricating oil supply from the main lubricating oil pump 13 in the normal load operation state of the steam turbine 4. Lubricating oil 17 is supplied to the pocket 36 through the hole 40. The lubricating oil 17 supplied to the pocket 36 spreads in the pocket 36 in the axial direction of the steam turbine rotor 8, and then enters the gap between the steam turbine rotor 8 and the lower half sliding surface 35b. The lubricating oil 17 that has entered the gap has an increased oil film pressure, and the steam turbine rotor 8 is supported by the oil film pressure. Part of the lubricating oil 17 supplied from the first oil passage hole 40 is discharged from the axial end of the lower half bearing 34 to the outside of the bearing when passing through the lower half sliding surface 35 b, and the other part is put into the pocket 37. It reaches.

  On the other hand, when the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 exceeds a predetermined vibration amplitude or a predetermined vibration acceleration due to an earthquake or the like, the dual-arc bearing lubricating oil system 2C receives a command from the control unit 31C. And the gate valve 53 is opened. Then, the dual arc bearing lubricating oil system 2 </ b> C supplies the lubricating oil 17 from the main lubricating oil pump 13 to the pocket 36 through the first oil passage hole 40, and the pocket 37 from the emergency oil tank 51 through the second oil passage hole 41. The emergency lubricating oil 54 is supplied. The lubricating oil 17 supplied to the pocket 36 lubricates the gap between the steam turbine rotor 8 and the lower half sliding surface 35b, while the emergency lubricating oil 54 supplied to the pocket 37 is connected to the steam turbine rotor 8 and the upper half sliding surface 35b. It enters the gap with the semi-sliding surface 35a. At this time, the two-arc bearing lubricating oil system 2C supplies the lubricating oil 17 by the starting lubricating oil pump 14 instead of the main lubricating oil pump 13 when the main lubricating oil pump 13 cannot sufficiently function. .

  Therefore, the two-arc bearing lubricating oil system 2C according to the present embodiment does not supply the lubricating oil 17 to the gap between the steam turbine rotor 8 and the upper half sliding surface 35a in the normal load operation state of the steam turbine 4. The bearing loss generated between the steam turbine rotor 8 and the upper half sliding surface 35a can be reduced.

  Further, the two-arc bearing lubricating oil system 2C supplies the emergency lubricating oil 54 to the gap between the steam turbine rotor 8 and the upper half sliding surface 35a in the event of an emergency such as an earthquake. Effects such as temperature reduction of the moving surface 35a, vibration reduction due to damping of the oil film, and frictional force reduction due to an increase in the oil film thickness can be obtained, and the reliability of the steam turbine rotor 8 and the double arc bearing 9 can be improved.

  Furthermore, since the dual-arc bearing lubricating oil system 2C supplies the gap between the steam turbine rotor 8 and the upper half sliding surface 35a using the potential energy of the emergency lubricating oil 54, the main lubricating oil pump 13 and the Even when the power source of the starting lubricating oil pump 14 is lost, the gap between the steam turbine rotor 8 and the upper half sliding surface 35a can be reliably lubricated.

[Fifth Embodiment]
A fifth embodiment of the dual-arc bearing lubricating oil system according to the present invention will be described with reference to FIGS. 10 and 11.

  FIG. 10 and FIG. 11 are schematic front views showing a main part of a dual arc bearing lubricating oil system according to a fifth embodiment of the present invention.

  Note that in this embodiment, the same reference numerals are given to the same components as those in the first embodiment, and duplicate descriptions are omitted.

  As shown in FIGS. 10 and 11, the two-arc bearing lubricating oil system 2 </ b> D according to the present embodiment has a flow path between the main lubricating oil pump 13 or the starting lubricating oil pump 14 and the second oil passage hole 41. A shielding plate 57 for closing, a vibration detecting unit 58 provided in the lubricating oil supply piping system 18, and a piercing member 59 that can vibrate together with the vibration detecting unit 58 are provided.

  The vibration detection unit 58 is provided at an elastic body member 58a such as a coil spring whose one end is fixed inside the lubricating oil supply piping system 18 and a free end portion of the elastic body member 58a. A weight member 58b having a required mass configured to be slidable.

  The piercing member 59 is provided on the weight member 58b of the vibration detection unit 58, and is configured to reciprocate inside the lubricating oil supply piping system 18 together with the weight member 58b.

  The shielding plate 57 is configured using a rubber plate or a metal plate. In the neutral state of the vibration detection unit 58, the shielding plate 57 is arranged at a predetermined distance from the piercing member 59.

The vibration detecting unit 58 reciprocates the weight member 58b inside the lubricating oil supply piping system 18 in response to vibration such as an earthquake applied to the two-arc bearing lubricating oil system 2D. When the vibration such as an earthquake applied to the dual-arc bearing lubricating oil system 2D is equal to or greater than a predetermined value, the amplitude of the weight member 58b increases, and the punching member 59 reaches the shielding plate 57 to punch the shielding plate 57. Thus, the dual-arc bearing lubricating oil system 2D supplies the lubricating oil 17 to the pocket 37 through the second oil passage hole 41 from the main lubricating oil pump 13 or the starting lubricating oil pump 14. (Transition from the state shown in FIG. 10 to the state shown in FIG. 12)
The double arc bearing 9 is configured such that the second oil passage hole 41 is provided in the upper half bearing 33 and the lubricating oil 17 is directly supplied between the steam turbine rotor 8 and the upper half sliding surface 35a. You can also.

  The dual-arc bearing lubricating oil system 2 </ b> D configured as described above is configured so that the flow between the main lubricating oil pump 13 or the starting lubricating oil pump 14 and the second oil passage hole 41 in the normal load operation state of the steam turbine 4. The passage is closed by the shielding plate 57, and the lubricant 17 is supplied from the main lubricant pump 13 to the pocket 36 through the first oil passage hole 40. The lubricating oil 17 supplied to the pocket 36 spreads in the pocket 36 in the axial direction of the steam turbine rotor 8 and then enters the gap between the steam turbine rotor 8 and the lower half sliding surface 35b. The lubricating oil 17 that has entered this gap has an increased oil film pressure, and the steam turbine rotor 8 is supported by this oil film pressure. Part of the lubricating oil 17 supplied from the first oil passage hole 40 is discharged from the axial end of the lower half bearing 34 to the outside of the bearing when passing through the lower half sliding surface 35 b, and the other part is put into the pocket 37. It reaches.

  On the other hand, in the two-arc bearing lubricating oil system 2D, when the vibration detected by the vibration detection unit 58 becomes a predetermined value or more due to an earthquake or the like, the shielding plate 57 is punched by the punching member 59. Then, the dual-arc bearing lubricating oil system 2D supplies the lubricating oil 17 from the main lubricating oil pump 13 to the pockets 36 and 37 through the first oil passage hole 40 and the second oil passage hole 41. The lubricating oil 17 supplied to the pocket 36 lubricates the gap between the steam turbine rotor 8 and the lower half sliding surface 35b, while the lubricating oil 17 supplied to the pocket 37 passes between the steam turbine rotor 8 and the upper half sliding surface. Enter the gap with the moving surface 35a. At this time, the two-arc bearing lubricating oil system 2D supplies the lubricating oil 17 by the starting lubricating oil pump 14 instead of the main lubricating oil pump 13 when the main lubricating oil pump 13 cannot sufficiently function. .

  Therefore, the two-arc bearing lubricating oil system 2D according to the present embodiment does not supply the lubricating oil 17 to the gap between the steam turbine rotor 8 and the upper half sliding surface 35a in the normal load operation state of the steam turbine 4. The bearing loss generated between the steam turbine rotor 8 and the upper half sliding surface 35a can be reduced.

  Further, the two-arc bearing lubricating oil system 2D supplies the lubricating oil 17 to the gap between the steam turbine rotor 8 and the upper half sliding surface 35a in an emergency such as an earthquake, and the steam turbine rotor 8 and the upper half sliding surface. Effects such as temperature reduction of 35a, vibration reduction by damping of the oil film, and frictional force reduction by increasing the oil film thickness can be obtained, and the reliability of the steam turbine rotor 8 and the double arc bearing 9 can be improved.

  Further, the dual-arc bearing lubricating oil system 2D opens the flow path between the main lubricating oil pump 13 or the starting lubricating oil pump 14 and the second oil passage hole 41 using the energy of vibration, and the steam turbine rotor 8 Since oil is supplied to the gap between the upper turbine sliding surface 35a and the upper half sliding surface 35a, there is no need for various sensors for detecting vibration, gate valves, control units, etc. The gap can be lubricated.

[Sixth Embodiment]
A sixth embodiment of the dual-arc bearing lubricating oil system according to the present invention will be described with reference to FIGS. 12 and 13.

  12 and 13 are schematic front views showing the main part of a dual arc bearing lubricating oil system according to a sixth embodiment of the present invention.

  Note that in this embodiment, the same reference numerals are given to the same components as those in the first embodiment, and duplicate descriptions are omitted.

  As shown in FIGS. 12 and 13, the two-arc bearing lubricating oil system 2 </ b> E according to the present embodiment includes a vibration detecting unit 58, a closing member 61 that can vibrate together with the vibration detecting unit 58, and the lubricating oil supply piping system 18. And a stopper 62 (locking projection) provided on the inner wall so as to be able to appear and retract.

  The vibration detection unit 58 is provided at an elastic body member 58a such as a coil spring whose one end is fixed inside the lubricating oil supply piping system 18 and a free end portion of the elastic body member 58a. A weight member 58b having a required mass configured to be slidable.

  The closing member 61 is provided on the weight member 58b of the vibration detection unit 58, and is configured to be slidable inside the lubricating oil supply piping system 18 together with the weight member 58b. The closing member 61 is formed with a recess 63 (locking recess) corresponding to the shape of the stopper 62. The closing member 61 includes a packing member 64. It is pressed by the packing member 64 and the inner wall portion of the lubricating oil supply piping system 18 and closes the flow path between the main lubricating oil pump 13 or the starting lubricating oil pump 14 and the second oil passage hole 41.

  The stopper 62 is arranged at a predetermined distance from the closing member 61 in the neutral state of the vibration detector 58.

  In the lubricating oil supply piping system 18, when the closing member 61 slides inside the lubricating oil supply piping system 18 and the concave portion 63 reaches the stopper 62, the main lubricating oil pump 13 or the starting lubricating oil pump 14 and the second oil passage are provided. The flow path between the holes 41 is configured to open.

  The vibration detection unit 58 reciprocates the weight member 58b within the lubricating oil supply piping system 18 in response to vibration such as an earthquake applied to the two-arc bearing lubricating oil system 2E. When the vibration such as an earthquake applied to the two-arc bearing lubricating oil system 2E exceeds a predetermined value, the amplitude of the weight member 58b increases, the recess 63 of the closing member 61 reaches the stopper 62, and the stopper 62 becomes the recess 63. And the closing member 61 is fixed. Thus, the dual-arc bearing lubricating oil system 2E supplies the lubricating oil 17 from the main lubricating oil pump 13 or the starting lubricating oil pump 14 to the pocket 37 through the second oil passage hole 41 (from the state shown in FIG. 12 to FIG. 13). Transition to the state shown in the following).

  The double arc bearing 9 is configured such that the second oil passage hole 41 is provided in the upper half bearing 33 and the lubricating oil 17 is directly supplied between the steam turbine rotor 8 and the upper half sliding surface 35a. You can also.

  The dual-arc bearing lubricating oil system 2E configured as described above is configured so that the flow between the main lubricating oil pump 13 or the starting lubricating oil pump 14 and the second oil passage hole 41 in the normal load operation state of the steam turbine 4 is achieved. The passage is closed by the closing member 61, and the lubricating oil 17 is supplied from the main lubricating oil pump 13 to the pocket 36 through the first oil passage hole 40. The lubricating oil 17 supplied to the pocket 36 spreads in the pocket 36 in the axial direction of the steam turbine rotor 8 and then enters the gap between the steam turbine rotor 8 and the lower half sliding surface 35b. The lubricating oil 17 that has entered this gap has an increased oil film pressure, and the steam turbine rotor 8 is supported by this oil film pressure. Part of the lubricating oil 17 supplied from the first oil passage hole 40 is discharged from the axial end of the lower half bearing 34 to the outside of the bearing when passing through the lower half sliding surface 35 b, and the other part is put into the pocket 37. It reaches.

  On the other hand, in the two-arc bearing lubricating oil system 2E, when the vibration detected by the vibration detection unit 58 exceeds a predetermined value due to an earthquake or the like, the sliding of the closing member 61 is restricted by the stopper 62. Then, the dual-arc bearing lubricating oil system 2 </ b> E supplies the lubricating oil 17 from the main lubricating oil pump 13 to the pockets 36 and 37 through the first oil passage hole 40 and the second oil passage hole 41. The lubricating oil 17 supplied to the pocket 36 lubricates the gap between the steam turbine rotor 8 and the lower half sliding surface 35b, while the lubricating oil 17 supplied to the pocket 37 passes between the steam turbine rotor 8 and the upper half sliding surface. Enter the gap with the moving surface 35a. At this time, if the main lubricating oil pump 13 cannot sufficiently function, the dual-arc bearing lubricating oil system 2E supplies the lubricating oil 17 by the starting lubricating oil pump 14 instead of the main lubricating oil pump 13. .

  Therefore, the two-arc bearing lubricating oil system 2ED according to the present embodiment does not supply the lubricating oil 17 to the gap between the steam turbine rotor 8 and the upper half sliding surface 35a in the normal load operation state of the steam turbine 4. The bearing loss generated between the steam turbine rotor 8 and the upper half sliding surface 35a can be reduced.

  Further, the two-arc bearing lubricating oil system 2E supplies the lubricating oil 17 to the gap between the steam turbine rotor 8 and the upper half sliding surface 35a in an emergency such as an earthquake, and the steam turbine rotor 8 and the upper half sliding surface. Effects such as temperature reduction of 35a, vibration reduction by damping of the oil film, and frictional force reduction by increasing the oil film thickness can be obtained, and the reliability of the steam turbine rotor 8 and the double arc bearing 9 can be improved.

  Further, the dual arc bearing lubricating oil system 2E uses the vibration energy to open a flow path between the main lubricating oil pump 13 or the starting lubricating oil pump 14 and the second oil passage hole 41, and the steam turbine rotor 8 Since oil is supplied to the gap between the upper turbine sliding surface 35a and the upper half sliding surface 35a, there is no need for various sensors for detecting vibration, gate valves, control units, etc. The gap can be lubricated.

[Seventh Embodiment]
A seventh embodiment of the dual arc bearing lubricating oil system according to the present invention will be described with reference to FIGS. 14 and 15.

  FIG. 14 is a schematic front view showing a main part of a dual arc bearing lubricating oil system according to a seventh embodiment of the present invention.

  FIG. 15 is a schematic cross-sectional view showing a main part of a dual arc bearing lubricating oil system according to a seventh embodiment of the present invention.

  Note that in this embodiment, the same reference numerals are given to the same components as those in the first embodiment, and duplicate descriptions are omitted.

  As shown in FIGS. 14 and 15, the two-arc bearing lubricant system 2F according to this embodiment includes a hydraulic pipe 12, a main lubricant pump 13, a starting lubricant pump 14, a two-arc bearing 9A, The vibration detection units 28 and 29 and the control unit 31F are provided.

  The lower half bearing 34A of the two-arc bearing 9A has a first oil passage hole 40 that guides the lubricating oil 17 from the outer peripheral side of the two-arc bearing 9A to the pocket 36.

  When the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 is less than a predetermined value, the control unit 31F supplies the lubricating oil 17 from the main lubricating oil pump 13 to the pocket 36 through the first oil passage hole 40. On the other hand, when the vibration detected by the vibration detecting unit 28 or the vibration detecting unit 29 is equal to or greater than a predetermined value, the main lubricating oil pump 13 and the starting lubricating oil pump 14 lubricate the pocket 36 through the first oil passage hole 40. Supply oil 17.

  Specifically, the control unit 31F receives the vibration measurement value detected by the vibration detection units 28 and 29 as an input, and if the vibration measurement value is equal to or greater than a predetermined value, the start lubrication is performed. The drive of the oil pump 14 is started.

  The two-arc bearing lubricating oil system 2 </ b> F configured as described above supplies the lubricating oil 17 to the pocket 36 from the main lubricating oil pump 13 through the first oil passage hole 40 in the normal load operation state of the steam turbine 4. The lubricating oil 17 supplied to the pocket 36 spreads in the pocket 36 in the axial direction of the steam turbine rotor 8 and then enters the gap between the steam turbine rotor 8 and the lower half sliding surface 35b. The lubricating oil 17 that has entered this gap has an increased oil film pressure, and the steam turbine rotor 8 is supported by this oil film pressure. Part of the lubricating oil 17 supplied from the first oil passage hole 40 is discharged from the axial end of the lower half bearing 34 to the outside of the bearing when passing through the lower half sliding surface 35 b, and the other part is put into the pocket 37. It reaches.

  On the other hand, when the vibration detected by the vibration detection unit 28 or the vibration detection unit 29 exceeds a predetermined vibration amplitude or a predetermined vibration acceleration due to an earthquake or the like, the dual-arc bearing lubricating oil system 2F receives a command from the control unit 31F. To start driving the lubricating oil pump 14 for starting. Then, the dual-arc bearing lubricating oil system 2F supplies the lubricating oil 17 from the main lubricating oil pump 13 and the starting lubricating oil pump 14 to the pocket 36 through the first oil passage hole 40. That is, the amount of the lubricating oil 17 supplied to the pocket 36 increases. The lubricating oil 17 supplied to the pocket 36 lubricates the gap between the steam turbine rotor 8 and the lower half sliding surface 35b, and further enters the gap between the steam turbine rotor 8 and the upper half sliding surface 35a.

  Therefore, the two-arc bearing lubricating oil system 2F according to the present embodiment does not supply the lubricating oil 17 to the gap between the steam turbine rotor 8 and the upper half sliding surface 35a in the normal load operation state of the steam turbine 4. The bearing loss generated between the steam turbine rotor 8 and the upper half sliding surface 35a can be reduced.

  Further, in the case of an emergency such as an earthquake, the dual arc bearing lubricating oil system 2F increases the amount of the lubricating oil 17 so that the lubricating oil 17 reaches the gap between the steam turbine rotor 8 and the upper half sliding surface 35a. The amount is increased, and the effects of reducing the temperature of the steam turbine rotor 8 and the upper half sliding surface 35a, reducing the vibration by damping the oil film, and reducing the frictional force by increasing the oil film thickness are obtained. The reliability of the bearing 9A can be improved.

  Therefore, according to the two-arc bearing lubricating oil systems 2, 2A, 2B, 2C, 2D, 2E, and 2F according to the embodiments of the present invention, the bearing loss during normal operation is reduced and steam is generated in an emergency such as an earthquake. Lubrication between the turbine rotor 8 and the two-arc bearings 9 and 9A can be sufficiently ensured, and the reliability can be improved.

DESCRIPTION OF SYMBOLS 1 Power generation equipment 2, 2A, 2B, 2C, 2D, 2E, 2F Dual arc bearing lubricating oil system 3 Steam generating part 4 Steam turbine 5 Generator 8 Steam turbine rotor 9, 9A Dual arc bearing 11 Oil tank 12 Hydraulic piping 13 Main lubricating oil pump 14 Starting lubricating oil pump 16 DC motor 17 Lubricating oil 18 Lubricating oil supply piping system 19 Lubricating oil return piping system 20 Oil turbine 21 Booster oil pump 22 Pressure switch 23 Oil tank 26 Booster oil pump 27 Gate valve 28 Vibration Detection unit 28a, 28b Displacement meter 29 Vibration detection unit 31, 31A, 31B, 31C, 31F Control unit 33 Upper half bearing 34, 34A Lower half bearing 35 Sliding surface 35a Upper half sliding surface 35ab Rotating downstream end 35b Lower half sliding Moving surface 35ba Rotating upstream end 35bb Rotating downstream end 36, 37 Pocket 38 Overshot groove 40 First oil passage hole 4 Second oil passage hole 43 Base 46 Lubricant oil discharge pipe 47 Drain pipe gate valve 49 Activation gate valve 51 Emergency oil tank 52 Emergency lubricant oil supply pipe 53 Gate valve 54 Emergency lubricant 57 Shield plate 58 Vibration detector 58a Elastic member 58b Weight member 59 Drilling member 61 Closure member 62 Stopper 63 Recess 64 Packing member 71 Dual arc bearing 72 Upper half bearing 73 Lower half bearing 74 Rotating shaft 76 Oil supply hole 75 Sliding surface 75a Upper half sliding surface 75b Lower half Sliding surfaces 77, 78 Pocket 79 Overshot groove 80 Weir

Claims (10)

A two-arc bearing having a first oil passage hole and a second oil passage hole, which includes a lower half bearing portion and an upper half bearing;
A lubricating oil supply source for supplying lubricating oil to the sliding surfaces of the rotating shaft and the two-arc bearing;
A vibration detector for detecting vibration applied to the rotary shaft and the two-arc bearing,
The first oil passage hole is provided in a range from the rotation downstream end of the upper half sliding surface to the rotation upstream end of the lower half sliding surface,
The second oil passage hole is provided on the downstream side of the rotation downstream end of the lower half sliding surface,
If the vibration detected by the vibration detector is less than a predetermined value, supply the lubricating oil from the lubricating oil supply source through the first oil passage hole,
When the vibration detected by the vibration detection unit is equal to or greater than the predetermined value, the lubricating oil is supplied from the lubricating oil supply source through the first oil passage hole and the second oil passage hole. Dual arc bearing lubricant system. A lubricating oil pipe for guiding the lubricating oil from the lubricating oil supply source to the first oil passage hole and the second oil passage hole;
A gate valve provided in the lubricating oil pipe for opening and closing a flow path between the lubricating oil supply source and the second oil passage hole;
The vibration detected by the vibration detection unit is compared with the predetermined value. If the vibration detected by the vibration detection unit is less than the predetermined value, the gate valve is closed and the vibration detection unit detects the vibration. The dual-arc bearing lubricating oil system according to claim 1, further comprising: a control unit that opens the gate valve when the generated vibration is equal to or greater than the predetermined value.   The two-arc bearing lubricating oil system according to claim 2, wherein the vibration detection unit is provided in the two-arc bearing.   The dual-arc bearing lubricating oil system according to claim 2, wherein the vibration detection unit is provided at a base portion where the dual-arc bearing is installed. A lubricating oil discharge pipe communicated between the gate valve and the second oil passage hole;
A discharge piping gate valve provided in the lubricating oil discharge piping,
The control unit opens the discharge pipe gate valve when the vibration detected by the vibration detection unit is less than the predetermined value, and when the vibration detected by the vibration detection unit is equal to or greater than the predetermined value. The two-arc bearing lubricating oil system according to claim 2, wherein the gate valve is closed. The lubricating oil supply source is:
A first lubricating oil pump communicated with the first oil passage hole and driven by the rotating shaft;
A second lubricating oil pump communicated with the second oil passage hole and driven by a drive source provided independently of the rotating shaft;
If the vibration detected by the vibration detector is less than the predetermined value, supply the lubricating oil from the first lubricating oil pump through the first oil passage hole,
When the vibration detected by the vibration detection unit is equal to or greater than the predetermined value, the lubricating oil is supplied from the first lubricating oil pump through the first oil passage hole, and the second lubricating oil pump supplies the first lubricating oil. 2. The dual arc bearing lubricating oil system according to claim 1, wherein the lubricating oil is supplied through a two oil passage hole. A gate valve for opening and closing a flow path between the second lubricating oil pump and the second oil passage hole;
When a second predetermined value smaller than the predetermined value is set and the vibration detected by the vibration detection unit reaches the second predetermined value, the gate valve is closed and the second lubricating oil 7. The control unit according to claim 6, further comprising: a control unit that starts driving the pump and opens the gate valve when the vibration detected by the vibration detection unit is equal to or greater than the predetermined value. Arc bearing lubrication system. The lubricating oil supply source is:
A lubricating oil pump communicated with the first oil passage hole and driven by the rotating shaft;
A lubricating oil tank connected to the second oil passage hole and supplying the lubricating oil according to a difference in potential energy;
A gate valve for opening and closing a flow path between the second oil passage hole and the lubricating oil tank;
The vibration detected by the vibration detection unit is compared with the predetermined value. If the vibration detected by the vibration detection unit is less than the predetermined value, the gate valve is closed and detected by the vibration detection unit. The dual-arc bearing lubricating oil system according to claim 1, further comprising: a control unit that opens the gate valve when the generated vibration is equal to or greater than the predetermined value. A shielding plate for closing a flow path between the lubricating oil supply source and the second oil passage hole;
A perforating member that vibrates together with the vibration detection unit,
When the vibration detected by the vibration detection unit is equal to or greater than the predetermined value, the shielding plate is perforated by the perforating member, and the lubricating oil is supplied from the lubricating oil supply source through the second oil passage hole. The dual-arc bearing lubricating oil system according to claim 1. A lubricating oil pipe for guiding the lubricating oil from the lubricating oil supply source to the second oil passage hole;
A closing member provided inside the lubricating oil pipe so as to be slidable, vibrates with the vibration detection unit, and has a locking recess;
A locking projection provided so as to be able to appear and retract on the inner wall of the lubricating oil pipe,
If the vibration detected by the vibration detector is less than the predetermined value, the lubricating oil pipe is closed by the closing member,
2. The structure according to claim 1, wherein when the vibration detected by the vibration detection unit is equal to or greater than the predetermined value, the locking projection is fitted into the locking recess and the lubricating oil pipe is opened. Two-arc bearing lubricant system as described.

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