JP5863437B2 - Thrust bearing device - Google Patents

Description

  The present invention relates to a thrust bearing device provided on a rotating shaft of a rotating body such as a steam turbine or a rotor of a gas turbine.

  As shown in FIGS. 10 and 11, a thrust bearing device 2 is provided on the rotary shaft 1 of the rotor of the steam turbine or the gas turbine. The rotating shaft 1 is provided horizontally, and a disc-shaped thrust collar 3 is projected from the outer peripheral surface 1 a of the rotating shaft 1 in the radial direction of the rotating shaft 1. The thrust bearing device 2 has a pair of bearing portions 4, and these bearing portions 4 are disposed on both sides of the thrust collar 3 in the axial direction of the rotating shaft 1 (horizontal direction: hereinafter simply referred to as the axial direction). By doing so, the side surface 3a of the thrust collar 3 is supported. That is, an axial load (thrust load) as indicated by arrows A and B in FIG. 10 is received by the bearing portions 4 on both sides.

  Each of the bearing portions 4 is configured as shown in FIG. That is, the bearing portion 4 includes a plurality of bearing pads 12 provided on the housing 11, a plurality of pillars 13, a plurality of upper leveling plates 14, a plurality of lower leveling plates 15, and a plurality of oil supply pieces. 16.

  The bearing pads 12 are arranged at equal intervals in the circumferential direction of the rotating shaft 1 (hereinafter simply referred to as the circumferential direction) (see FIG. 3), and the surface 12a faces the axial direction. Is opposed to the side surface 3a of the thrust collar 3 through a gap (hereinafter simply referred to as a gap) between the surface 12a of the thrust collar 3 and the side surface 3a of the thrust collar 3. The pillars 13 are respectively arranged on the back surface 12b side of the bearing pad 12, and are arranged at equal intervals in the circumferential direction. The bearing pad 12 has a convex portion 12 c formed on the back surface 12 b in contact with the surface 13 a of the pillar 13, and can tilt with the convex portion 12 c as a fulcrum.

  The upper leveling plate 14 and the lower leveling plate 15 constitute a leveling mechanism for the bearing pad 12.

  The upper leveling plates 14 are respectively disposed on the back surface 13b side of the pillar 13 and are arranged at equal intervals in the circumferential direction. Convex portions 13c are formed on the back surface 13b of the pillar 13, while concave portions 14b are formed on the surface 14a of the upper leveling plate 14, and the convex portions 13c and the concave portions 14b are fitted. . Therefore, the upper leveling plate 14 can be inclined with the concave portion 14b (the convex portion 13c) as a fulcrum.

  The lower leveling plates 15 are arranged between the upper leveling plates 14 adjacent in the circumferential direction (left-right direction in FIG. 12), and are arranged at equal intervals in the circumferential direction. The end portion 14c of the upper leveling plate 14 in the circumferential direction and the end portion 15a of the lower leveling plate 15 in the circumferential direction are in contact with each other so as to overlap each other in the axial direction. A concave portion 15c is formed on the back surface 15b of the lower leveling plate 15, while a convex portion 16 is formed on the back cover 11a of the housing 11, and the concave portion 15c and the convex portion 16 are fitted to each other. Yes. Accordingly, the lower leveling plate 15 can be inclined with the concave portion 15c (the convex portion 16) as a fulcrum.

  The oil supply pieces 16 are disposed between the bearing pads 12 adjacent in the circumferential direction, and are arranged at equal intervals in the circumferential direction. An oil supply hole 16 a is formed in the oil supply piece 16, and lubricating oil supplied to the oil supply piece 16 from a lubricating oil supply system (not shown) is ejected from the oil supply hole 16 a and supplied to the surface 12 a of the bearing pad 12. The As a result, a film of lubricating oil (hereinafter simply referred to as an oil film) is formed in the gap. Accordingly, the thrust load is applied to the bearing pad 12 from the thrust collar 3 through the oil film in the gap.

  As shown by a one-dot chain line in FIG. 10, when the rotation shaft 1 is inclined due to bending or thermal deformation and the thrust collar 3 is inclined along with this, if there is no leveling mechanism, at each position in the circumferential direction. The gap (thickness of the oil film) becomes non-uniform, and the thrust load sharing of each bearing pad 12 becomes non-uniform. That is, in the bearing pad 12 in which the gap is narrowed and the oil film is thin, the sharing of the thrust load is large, and in the bearing pad 12 in which the gap is wide and the oil film is thick, the sharing of the thrust load is small.

  On the other hand, the thrust bearing device 2 includes a leveling mechanism including an upper leveling plate 14 and a lower leveling plate 15, so that the bearing pad 12 follows the inclination of the thrust collar 3. By adjusting (ie, adjusting the position of the bearing pad 12 in the axial direction in accordance with the inclination of the thrust collar 3) (inclination adjustment), the gap can be adjusted. For this reason, even if the thrust collar 3 is inclined, the gap (the thickness of the oil film) at each position in the circumferential direction can be made uniform so that the thrust load of each bearing pad 12 can be made uniform.

  For example, in FIG. 12, when the gap is narrowed at the center bearing pad 12 and the oil film is thinned and the share of the thrust load is increased, the center bearing pad 12 is pushed by the large share load, and the back surface 12b It moves in the direction away from the thrust collar 3 as indicated by an arrow C together with the side pillar 13 and the upper leveling plate 14. On the other hand, since the end portion 14c of the upper leveling plate 14 and the end portion 15a of the lower leveling plate 15 are in contact with each other, the bearing pad 12 adjacent to the center bearing pad 12 has an upper level on the back surface 12b side. It moves together with the belling plate 14 and the pillar 13 in a direction approaching the thrust collar 3 as indicated by an arrow D. If the gap between the adjacent bearing pads 12 is narrow (if the oil film is thin), the adjacent bearing pad 12 is separated from the thrust collar 3, and the adjacent bearing pad 12 (not shown) is further thrust collar. Approach 3 Such an operation of the leveling mechanism occurs over the entire circumferential direction.

  That is, the bearing pad 12 whose gap is narrowed by the inclination of the thrust collar 3 is moved away from the thrust collar 3 by the action of the leveling mechanism to widen the gap, and the gap is widened by the inclination of the thrust collar 3. The bearing pad 12 is moved in a direction approaching the thrust collar 3 to narrow the gap. Thus, the bearing pad 12 follows the inclination of the thrust collar 3, the gaps at the respective positions in the circumferential direction become uniform, and the share of the thrust load of each bearing pad 12 becomes uniform.

  As prior art documents in which a thrust bearing device equipped with a leveling mechanism composed of an upper leveling plate and a lower leveling plate is disclosed, there are the following Patent Documents 1 and 2. .

U.S. Pat. No. 4,335,925 JP 2002-310142 A

  However, in the conventional thrust bearing device 2, since the inclination adjustment (gap adjustment) is performed only by the leveling mechanism constituted by the upper leveling plate 14 and the lower leveling plate 15, the thrust collar 3 When the inclination of the bearing is large, the bearing pad 12 cannot follow.

  For this reason, the gaps (thickness of the oil film) at the respective positions in the circumferential direction are non-uniform, and the thrust load sharing of the respective bearing pads 12 is non-uniform. As a result, in the bearing pad 12 in which the gap becomes narrow (the oil film becomes thin) and the share of the thrust load becomes large, the temperature (metal temperature) may rise and burn out.

  Therefore, in view of the above-described circumstances, the present invention makes uniform the gap (the thickness of the oil film) at each position in the circumferential direction even when the thrust collar is largely inclined, so that the thrust load of each bearing pad is shared uniformly. It is an object of the present invention to provide a thrust bearing device capable of performing the above.

A thrust bearing device according to a first aspect of the present invention that solves the above-described problem is to support a disc-shaped thrust collar projecting on the outer peripheral surface of a rotating shaft of a rotating body by a pair of bearing portions disposed on both sides of the thrust collar. The bearing portion is arranged on the back side of the bearing pad, and a plurality of bearing pads arranged in the circumferential direction of the rotating shaft and facing the side surface of the thrust collar via a gap. A thrust bearing device having a structure including a leveling mechanism for the bearing pad, which includes a plurality of upper leveling plates and a plurality of lower leveling plates;
A hydraulic jack is installed on the back surface of the lower leveling plate, and a thrust load applied from the thrust collar to the bearing pad through the oil film in the gap is transmitted to the hydraulic pressure via the upper leveling plate and the lower leveling plate. It is configured to receive with a jack ,
Temperature detecting means for detecting the temperature of two of the plurality of bearing pads;
When the detected temperature of the two bearing pads obtained by the temperature detecting means is compared with a set temperature, and as a result, when it is determined that one or both of the detected temperatures are equal to or higher than the set temperature, The difference between the detected temperatures is calculated, the detected temperature difference is compared with the set temperature difference, and as a result, when it is determined that the detected temperature difference is equal to or greater than the set temperature difference, the stroke of the hydraulic jack is set. While adjusting the inclination of the plurality of bearing pads by adjusting, if it is determined that the detected temperature difference is not greater than the set temperature difference, the plurality of bearing pads is adjusted by adjusting the stroke of the hydraulic jack. Hydraulic jack control means for controlling the gap to be widened as a whole by adjusting the position of
It is provided with.

The thrust bearing device of the second invention is the thrust bearing device of the first invention,
Temperature detecting means for detecting the temperature of at least one of the plurality of bearing pads;
Hydraulic jack control means for adjusting the clearance by adjusting the stroke of the hydraulic jack and adjusting the position of the bearing pad based on the detected temperature of the at least one bearing pad obtained by the temperature detection means. When,
It is provided with.

A thrust bearing device according to a third aspect of the present invention is the thrust bearing device according to the first or second aspect , wherein a variable throttle mechanism provided in a supply line of a hydraulic system that supplies hydraulic oil to the hydraulic jack;
A displacement amount detecting means for detecting a displacement amount of the rotating shaft in the axial direction;
When the displacement amount in the axial direction of the rotary shaft detected by the displacement amount detection means becomes equal to or larger than a set displacement amount, the axial displacement of the rotary shaft is adjusted by adjusting the throttle amount of the variable throttle mechanism. Variable throttle mechanism control means for suppressing movement;
It is provided with.

According to the thrust bearing device of the first aspect of the invention, the disc-shaped thrust collar projecting on the outer peripheral surface of the rotating shaft of the rotating body is supported by the pair of bearing portions disposed on both sides of the thrust collar, and The bearing portion includes a plurality of bearing pads arranged in a circumferential direction of the rotating shaft and facing a side surface of the thrust collar via a gap, and a plurality of bearing pads disposed on the back side of the bearing pad. In the thrust bearing device comprising the bearing pad leveling mechanism having an upper leveling plate and a plurality of lower leveling plates, a hydraulic jack is installed on the back surface of the lower leveling plate, and the thrust The thrust load applied from the collar to the bearing pad through the oil film in the gap is passed through the upper leveling plate and the lower leveling plate. Since the hydraulic jack is configured to receive the hydraulic jack, the axial position of each bearing pad can be adjusted (that is, the gap can be adjusted) by a leveling mechanism including an upper leveling plate and a lower leveling plate. In addition, the position of each bearing pad in the axial direction can be adjusted (that is, the gap can be adjusted) by adjusting the stroke of the hydraulic jack.
For this reason, even when the thrust collar is inclined so much that the leveling mechanism cannot handle it, the stroke of the hydraulic jack is adjusted to adjust the axial position of each bearing pad (the bearing pad is made to follow the inclination of the thrust collar). ), The gaps (the thickness of the oil film) at the respective positions in the circumferential direction can be made uniform, and the thrust load sharing of each bearing pad can be made uniform. In other words, when the thrust collar has a small inclination, the bearing pad can be adjusted by adjusting the inclination (gap adjustment) using the leveling mechanism, and when the thrust collar has a large inclination, the bearing pad can be adjusted by adjusting the inclination (gap adjustment) using the hydraulic jack. Therefore, it is possible to cope with the inclination of the thrust collar widely and appropriately. Therefore, it is possible to reliably prevent the bearing pad from being burned out and improve the soundness of the thrust bearing device.
Furthermore, not only the inclination adjustment corresponding to the inclination of the thrust collar but also the end play (gap) can be adjusted by a hydraulic jack. That is, even after assembly (after the thrust bearing device is attached to the rotating shaft), the clearance can be adjusted by the hydraulic jack. For this reason, even when it is necessary to adjust the gap after installing the rotating body, it can be easily handled.
It is also conceivable to provide a hydraulic jack directly on the back of the bearing pad. In this case, if hydraulic oil is not supplied to the hydraulic jack from the time of assembly (when the thrust bearing device is attached to the rotating shaft), the gap Adjustment is difficult and time-consuming assembly work. On the other hand, the thrust bearing device of the present invention is provided with a leveling mechanism including an upper leveling plate and a lower leveling plate by providing a hydraulic jack on the back surface of the lower leveling plate. The assembly work is easy without supplying hydraulic oil to the hydraulic jack.
According to the thrust bearing device of the first aspect of the present invention, temperature detecting means for detecting the temperature of two of the plurality of bearing pads, and detection of the two bearing pads obtained by the temperature detecting means. When the temperature is compared with the set temperature and, as a result, it is determined that one or both of the detected temperatures are equal to or higher than the set temperature, the difference between the detected temperatures is calculated, and the detected temperature difference and the set temperature are calculated. When the temperature difference is compared and, as a result, it is determined that the detected temperature difference is greater than or equal to the set temperature difference, the inclination of the plurality of bearing pads is adjusted by adjusting the stroke of the hydraulic jack. If it is determined that the detected temperature difference is not greater than or equal to the set temperature difference, the positions of the plurality of bearing pads are adjusted by adjusting the stroke of the hydraulic jack. In addition, since the hydraulic jack control means for controlling the gap to be widened as a whole is provided, not only the detected temperature but also the detected temperature difference is taken into account (the increase in the bearing pad temperature is It is possible to more accurately adjust the stroke of the hydraulic jack (that is, adjust the clearance) by determining whether the thrust collar is largely inclined or due to insufficient adjustment of the end play. For this reason, the burning of the bearing pad can be prevented more reliably, and the soundness of the thrust bearing device can be further improved.

  According to the thrust bearing device of the second invention, in the thrust bearing device of the first invention, the temperature detecting means for detecting the temperature of at least one of the plurality of bearing pads, and the temperature detecting means. Hydraulic jack control means for adjusting the gap by adjusting the position of the bearing pad by adjusting the stroke of the hydraulic jack based on the detected temperature of the at least one bearing pad. Therefore, the stroke adjustment (i.e., clearance adjustment) of the hydraulic jack can be performed based on the temperature of the bearing pad. For this reason, the burning of the bearing pad can be prevented more reliably, and the soundness of the thrust bearing device is further improved.

According to the thrust bearing device of the third invention, in the thrust bearing device of the first or second invention , a variable throttle mechanism provided in a supply line of a hydraulic system for supplying hydraulic oil to the hydraulic jack, and the shaft of the rotary shaft A displacement amount detecting means for detecting a displacement amount in the direction; and when a displacement amount in the axial direction of the rotary shaft detected by the displacement amount detecting means is equal to or greater than a set displacement amount, It is characterized in that it is equipped with a variable throttle mechanism control means that suppresses the swing of the rotating shaft in the axial direction by adjusting, so that the tilt of the bearing pad can be adjusted not only by a hydraulic jack, but also variable Oscillation of the rotating shaft can be suppressed by the diaphragm mechanism.

1 is an overall schematic diagram of a thrust bearing device according to Embodiment 1 of the present invention. It is a schematic diagram (E direction arrow view of FIG. 1) of the back side of the thrust bearing device according to Embodiment 1 of the present invention. It is a front view (figure which looked at the bearing part from the axial direction) of the bearing part of the thrust bearing device concerning Embodiment 1 of the present invention. FIG. 5 is a cross-sectional view (a cross-sectional view taken along line FF in FIG. 3) showing a part of the bearing portion of the thrust bearing device according to Embodiment 1 of the present invention in a straight line. It is a schematic diagram of the bearing part of the thrust bearing apparatus which concerns on Example 1 of Embodiment of this invention. It is a front view (figure which looked at the bearing part from the axial direction) of the bearing part of the thrust bearing device concerning Embodiment 2 of the present invention. It is a schematic diagram of a bearing portion of a thrust bearing device according to Embodiment 2 of the present invention. It is a flowchart which shows the process sequence of the control apparatus with which the thrust bearing apparatus which concerns on Example 2 of this invention was equipped. It is a schematic diagram of the bearing part of the thrust bearing apparatus which concerns on Example 3 of Embodiment of this invention. It is a whole schematic diagram of a conventional thrust bearing device. It is a schematic diagram of the back side of a conventional thrust bearing device (a view in the direction of arrow G in FIG. 1). It is sectional drawing which expands and shows a part of bearing part of the conventional thrust bearing apparatus linearly.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

<Embodiment 1>
A thrust bearing device 22A according to Embodiment 1 of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, a thrust bearing device 22A according to the first embodiment is provided on a rotating shaft 21 of a rotor of a steam turbine or a gas turbine. The rotating shaft 21 is provided horizontally, and a disc-shaped thrust collar 23 is provided on the outer peripheral surface 21 a of the rotating shaft 21 so as to protrude in the radial direction of the rotating shaft 21. The thrust bearing device 22A has a pair of bearing portions 24, and these bearing portions 24 are disposed on both sides of the thrust collar 23 in the axial direction of the rotating shaft 21 (horizontal direction: hereinafter simply referred to as the axial direction). By doing so, the side surface 23a of the thrust collar 23 is supported. That is, an axial load (thrust load) as indicated by arrows H and I in FIG. 1 is received by the bearing portions 24 on both sides.

  In the thrust bearing device 22A of the first embodiment, the hydraulic jack 31 is provided on the back surface of the bearing portion 24.

  Based on FIGS. 3-5, the structure of the bearing part 24 is demonstrated in detail. Since all the bearing portions 24 are configured as shown in FIGS. 3 to 5, the configuration of one bearing portion 24 will be described here, and the description of the configuration of the other bearing portion 24 will be omitted. .

  The basic configuration of the bearing portion 24 is the same as that of the conventional bearing portion 4 (FIG. 11). That is, as shown in FIGS. 3 to 5, the bearing portion 24 includes a plurality of (eight in the illustrated example) bearing pads 32 provided in the housing 41, a plurality (eight in the illustrated example) pillars 33, A plurality (eight in the illustrated example) upper leveling plate 34, a plurality (eight in the illustrated example) lower leveling plate 35, a plurality (eight in the illustrated example) oil supply pieces 36, and a plurality ( 8 hydraulic jacks 31 in the illustrated example).

  The bearing pads 32 are arranged at equal intervals in the circumferential direction of the rotating shaft 21 (hereinafter simply referred to as the circumferential direction) (FIG. 3), and the surface 32a faces the axial direction. It faces the side surface 23a of the thrust collar 23 through a gap (hereinafter, simply referred to as a gap) between 32a and the side surface 23a of the thrust collar 23. The pillars 33 are respectively disposed on the back surface 32b side of the bearing pad 32, and are arranged at equal intervals in the circumferential direction. The bearing pad 32 has a convex portion 32c formed on the back surface 32b in contact with the surface 33a of the pillar 33, and can be inclined with the convex portion 32c as a fulcrum.

  The upper leveling plate 34 and the lower leveling plate 35 constitute a leveling mechanism for the bearing pad 32.

The upper leveling plates 34 are respectively arranged on the back surface 33b side of the pillar 33, and are arranged at equal intervals in the circumferential direction. Convex portions 33c are formed on the back surface 33b of the pillar 33, while concave portions 34b are formed on the surface 34a of the upper leveling plate 34, and these convex portions 33c and concave portions 34b are fitted. . Therefore, the upper leveling plate 34 can be inclined with the concave portion 34b (the convex portion 33c) as a fulcrum.
In the first embodiment, the pillar 33 is provided. However, the present invention is not limited to this. The pillar 33 is not provided, and the protrusion 32c of the bearing pad 32 is directly connected to the surface of the upper leveling plate 34. The structure may be abutted against 34a.

  The lower leveling plates 35 are disposed between the upper leveling plates 34 adjacent in the circumferential direction, and are arranged at equal intervals in the circumferential direction. An end portion 34c of the upper leveling plate 34 in the circumferential direction and an end portion 35a of the lower leveling plate 35 in the circumferential direction are in contact with each other in the axial direction.

  The hydraulic jacks 31 are respectively disposed on the back surface 35 b of the lower leveling plate 35 and correspond to the bearing pads 32. The hydraulic jack 31 is disposed such that a main body (cylinder portion) 31a is fixed to the back cover 41a of the housing 41 and the expansion / contraction direction of the rod 31b is the axial direction. The front end surface 31 b-1 of the rod 31 b is in contact with the back surface 35 b of the lower leveling plate 35. Therefore, the lower leveling plate 35 can be tilted with the tip surface 31b-1 of the rod 31b as a fulcrum. The thrust load applied from the thrust collar 23 to the bearing pad 32 is received by the hydraulic jack 31 via the pillar 33, the upper leveling plate 34 and the lower leveling plate 35.

  As shown in FIG. 5, the hydraulic system for supplying hydraulic oil to the hydraulic jack 31 includes a hydraulic pump 53, a tank 51 storing hydraulic oil 52, a supply line (pipe) 55, and a branch line (pipe) 55a. And a relief valve 54. The downstream side of the supply line 55 is branched into a plurality of (eight in the illustrated example) branch lines 55 a, and the upstream side of the supply line 55 is connected to the discharge side of the hydraulic pump 53. The downstream side of the branch line 55 a is connected to the hydraulic jack 31. The suction side of the hydraulic pump 53 extends into the tank 51. Therefore, when the hydraulic pump 53 operates, the hydraulic oil 52 in the tank 51 is supplied to the hydraulic jack 31 via the supply line 55 and the branch line 55a.

  As shown in FIGS. 3 and 4, the oil filler pieces 36 are disposed between the bearing pads 32 adjacent in the circumferential direction, and are arranged at equal intervals in the circumferential direction. An oil supply hole 36 a is formed in the oil supply piece 36, and lubricating oil supplied to the oil supply piece 36 from a lubricating oil supply system (not shown) is ejected from the oil supply hole 36 a and supplied to the surface 32 a of the bearing pad 32. The As a result, a film of lubricating oil (hereinafter simply referred to as an oil film) is formed in the gap. Therefore, the thrust load is applied to the bearing pad 32 from the thrust collar 23 through the oil film in the gap.

  As shown by the one-dot chain line in FIG. 1, when the rotary shaft 21 is inclined due to bending or thermal deformation, and the thrust collar 23 is inclined along with this, if there is no leveling mechanism, at each position in the circumferential direction. The gap (thickness of the oil film) becomes non-uniform, and the thrust load sharing of each bearing pad 32 becomes non-uniform. That is, the bearing pad 32 having a narrow gap and a thin oil film has a large share of thrust load, and the bearing pad 32 having a wide gap and a thick oil film has a small share of thrust load.

  On the other hand, the thrust bearing device 22A is provided with a leveling mechanism composed of an upper leveling plate 34 and a lower leveling plate 15, so that the bearing pad 32 follows the inclination of the thrust collar 23. The clearance can be adjusted by adjusting the position of the bearing pad 12 in the axial direction according to the inclination of the thrust collar 23 (inclination adjustment). . For this reason, even if the thrust collar 23 is inclined, the gap (the thickness of the oil film) at each position in the circumferential direction can be made uniform, and the share of the thrust load of each bearing pad 12 can be made uniform.

  For example, in FIG. 4, when the gap is narrowed at the center bearing pad 32 and the oil film is thinned and the share of the thrust load is increased, the center bearing pad 32 is pushed by the large share load and the back surface 32b It moves in the direction away from the thrust collar 23 as indicated by an arrow J together with the side pillar 33 and the upper leveling plate 34. On the other hand, since the end portion 34c of the upper leveling plate 34 and the end portion 35a of the lower leveling plate 35 are in contact with each other, the bearing pad 32 adjacent to the center bearing pad 32 has an upper level on the back surface 32b side. It moves in the direction approaching the thrust collar 23 as shown by the arrow K together with the belling plate 34 and the pillar 33. If the gap between the adjacent bearing pads 32 is narrow (if the oil film is thin), the adjacent bearing pad 32 is separated from the thrust collar 23, and the adjacent bearing pad 32 (not shown) is further thrust collar. It approaches 23. Such an operation of the leveling mechanism occurs over the entire circumferential direction.

  That is, the bearing pad 32 whose gap is narrowed by the inclination of the thrust collar 23 is moved away from the thrust collar 23 by the action of the leveling mechanism to widen the gap, and the gap is widened by the inclination of the thrust collar 23. The bearing pad 32 is moved in a direction approaching the thrust collar 23 to narrow the gap. Thus, the bearing pad 32 follows the inclination of the thrust collar 23, the gaps at the respective positions in the circumferential direction become uniform, and the share of the thrust load of each bearing pad 32 becomes uniform.

  Since the thrust bearing device 22A is also equipped with a hydraulic jack 31, if the tilt of the thrust collar 23 is large, the tilt of the bearing pad 32 can be adjusted by the hydraulic jack 31.

  That is, with respect to the bearing pad 32 in which the gap is narrowed (the oil film is thinned) due to the inclination of the thrust collar 23, the stroke of the rod 31b of the hydraulic jack 31 corresponding to the bearing pad 32 (hereinafter simply referred to as a stroke). ) Is shortened (the rod 31b is degenerated), the gap between the bearing pads 32 can be widened (the oil film is thickened). On the other hand, the stroke of the hydraulic jack 31 corresponding to the bearing pad 32 is lengthened (the rod 31b is extended) for the bearing pad 32 in which the gap is widened (the oil film is thick) due to the inclination of the thrust collar 23. As a result, the gap between the bearing pads 32 can be narrowed (the oil film can be thinned). Thus, the bearing pad 32 can follow the inclination of the thrust collar 23 (that is, the axial position of the bearing pad 32 is adjusted according to the inclination of the thrust collar 23) (tilt adjustment).

  In such inclination adjustment (gap adjustment) by the hydraulic jack 31, for example, an operator sets (inputs) a target stroke of each hydraulic jack 31 to the hydraulic jack control device 56 shown in FIG. Each hydraulic jack 31 is controlled so that the stroke of each hydraulic jack 31 is set to the target stroke. Alternatively, an operator may directly operate each hydraulic jack 31 to adjust the stroke of each hydraulic jack 31.

As described above, according to the thrust bearing device 22A of the first embodiment, the disk-shaped thrust collars 23 protruding from the outer peripheral surface 21a of the rotor rotating shaft 21 are disposed on both sides of the thrust collar 23. The bearing portion 24 is supported by the pair of bearing portions 24, and the bearing portion 24 is arranged in the circumferential direction and faces the side surface 23 a of the thrust collar 23, and the back surface 32 b side of the bearing pad 32. In a thrust bearing device 22A having a structure including a leveling mechanism for a bearing pad 32 having a plurality of upper leveling plates 34 and a plurality of lower leveling plates 35 disposed on the lower side, The hydraulic jacks 31 are respectively installed on the back surface 35b of the leveling plate 34, and the thrust load applied from the thrust collar 23 to the bearing pad 32 is increased by the upper leveling plate. 4 and the lower leveling plate 35, the leveling mechanism includes an upper leveling plate 34 and a lower leveling plate 35. In addition to adjusting the axial position of each bearing pad 32 (ie, adjusting the gap), the axial position of each bearing pad 32 can also be adjusted (ie, the gap can be adjusted) by adjusting the stroke of the hydraulic jack 31. Adjustment).
For this reason, even if the thrust collar 23 is inclined so much that the leveling mechanism cannot cope, the stroke of the hydraulic jack 31 is adjusted to adjust the axial position of each bearing pad 32 (the bearing pad 32 is thrust By following the inclination of the collar 23), the gap (the thickness of the oil film) at each position in the circumferential direction can be made uniform, and the thrust load sharing of each bearing pad 32 can be made uniform. That is, when the inclination of the thrust collar 23 is small, the inclination adjustment (gap adjustment) of the bearing pad 32 by the leveling mechanism corresponds, and when the inclination of the thrust collar 23 is large, the inclination adjustment of the bearing pad 32 by the hydraulic jack 31 ( Therefore, it is possible to cope with the inclination of the thrust collar 23 widely and appropriately. Therefore, it is possible to reliably prevent the bearing pad 32 from being burned out and improve the soundness of the thrust bearing device 22A.
Furthermore, not only the inclination adjustment corresponding to the inclination of the thrust collar 23 but also the end play (gap) can be adjusted by the hydraulic jack 31. In other words, the gap can be adjusted by the hydraulic jack 31 even after assembly (after the thrust bearing device 22A is attached to the rotating shaft 21). For this reason, even when the clearance adjustment is necessary after installing the rotor of the steam turbine or the gas turbine, it can be easily handled.
It is also conceivable to provide a hydraulic jack directly on the back of the bearing pad. In this case, if hydraulic oil is not supplied to the hydraulic jack from the time of assembly (when the thrust bearing device is attached to the rotating shaft), the gap Adjustment is difficult and time-consuming assembly work. In contrast, in the thrust bearing device 22A of the first embodiment, the upper leveling plate 34 and the lower leveling plate 35 are provided by providing the hydraulic jack 31 on the back surface 35b of the lower leveling plate 35. Therefore, the assembly work can be easily performed without supplying hydraulic oil to the hydraulic jack 31.

<Embodiment 2>
A thrust bearing device 22B according to Embodiment 2 of the present invention will be described with reference to FIGS. The outline of the overall configuration of the thrust bearing device 22B according to the second embodiment is the same as that of the thrust bearing device 22A according to the first embodiment (see FIGS. 1 and 2). And description is abbreviate | omitted. Further, in the thrust bearing device 22B of the second embodiment, the same parts as those of the thrust bearing device 22A (see FIGS. 1 to 5) of the first embodiment are denoted by the same reference numerals and overlapped. Description is omitted.

  As shown in FIGS. 6 and 7, the thrust bearing device 22B according to the second embodiment includes two temperature sensors 61A and 61B (temperature detection means) and a control device 62 (hydraulic jack control means). Yes.

One temperature sensor 61 </ b> A is installed on a bearing pad 32 (hereinafter, this bearing pad code is also indicated as 32 </ b> A) disposed at the top of the bearing portion 24. The other temperature sensor 61B is installed in a bearing pad 32 (hereinafter, this bearing pad code is also indicated as 32B) disposed at the lowermost portion of the bearing portion 24. That is, the temperature sensors 61A and 61B are respectively installed on the two bearing pads 32A and 32B that are located on both sides in the radial direction of the rotating shaft 21 (that is, at positions that are rotationally symmetrical to each other by 180 ° C.).
In all the bearing pads 32, the bearing pad 32 having the highest temperature (ie, the narrowest gap) and the bearing pad 32 having the lowest temperature (ie, the widest gap) are inclined by the inclination of the thrust collar 23. This can be predicted at the design stage of the bearing device 22B. In the case of the illustrated example, the uppermost bearing pad 32A and the lowermost bearing pad 32B have the highest temperature (the smallest gap) and the lowest temperature due to the inclination of the thrust collar 23 (the lowest). Since the bearing pads are predicted to be wide), the temperature sensors 61A and 61B are installed on these bearing pads 32A and 32B.

The temperature sensor 61A detects the temperature (metal temperature) T ₁ of the bearing pad 32A and outputs a signal of the detected temperature T ₁ to the control device 62. The temperature sensor 61B detects the temperature (metal temperature) T ₂ of the bearing pad 32B and outputs a signal of the detected temperature T ₂ to the control device 62.

The control device 62 adjusts the clearance (inclination adjustment or end play adjustment) based on the detected temperature T ₁ of the bearing pad 32A input from the temperature sensor 61A and the detected temperature T ₂ of the bearing pad 32B input from the temperature sensor 61B. )I do. The processing contents of the control device 62 will be described in detail based on the flowchart of FIG. In addition, the code | symbol of S1-S8 was attached | subjected to each step of FIG. When the control device 62 is activated, the processing shown in the flowchart in FIG. 8 is repeatedly executed by the control device 62.

In the control unit 62 starts a process at step S1, first, in step S2, the signal of the detected temperature T ₁ of the bearing pads 32A sent from the temperature sensor 61A, bearing pads 32B sent from the temperature sensor 61B inputs the detected temperature T ₂ of the signal. On the other hand, a set temperature T ₀ and a set temperature difference ΔT ₀ are set (input) in advance in the control device 62.

When the end play (gap) is properly adjusted, the gap (oil film thickness) at each position in the circumferential direction is uniform and the thrust of each bearing pad 32 unless the thrust collar 23 is inclined. Since the load sharing is uniform, the detected temperature differences T ₁ and T ₂ do not exceed the set temperature T ₀ . Even if the thrust collar 23 is inclined, if the inclination is small, the inclination adjustment (gap adjustment) is performed by the leveling mechanism constituted by the upper leveling plate 14 and the lower leveling plate 15. Since the gaps (thickness of the oil film) at each position in the circumferential direction are substantially uniform and the thrust load of each bearing pad 32 is substantially uniform, the detected temperature differences T ₁ and T ₂ are the set temperature differences T Never more than _zero .

On the other hand, when the thrust collar 23 is tilted so large that the leveling mechanism alone cannot perform sufficient tilt adjustment (gap adjustment), the gap (oil film thickness) at each position in the circumferential direction is not uniform. Thus, the distribution of the thrust load of each bearing pad 32 becomes non-uniform, and the variation in metal temperature increases. For this reason, the detected temperature T ₁ or the detected temperature T ₂ becomes _{equal to} or higher than the set temperature T ₀ .
That is, when the thrust collar 23 is greatly inclined to one side in the axial direction, the gap between the upper bearing pad 32A is narrowed and the gap between the lower bearing pad 32B is widened, so that the detected temperature T ₁ is increased and set. The temperature becomes _{equal to} or higher than the temperature T ₀ , and the detected temperature T ₂ decreases. When the thrust collar 23 is greatly inclined to the other in the axial direction, the gap between the lower bearing pad 32B is narrowed and the gap between the upper bearing pad 32A is widened. Therefore, the detected temperature T ₂ rises and the set temperature T _The detected temperature T ₁ is reduced to ₀ or more.
In these cases, the temperature difference ΔT between the detected temperature T ₁ and the detected temperature T ₂ becomes large. Therefore, if the temperature difference ΔT is equal to or greater than the set temperature difference ΔT _0, it can be estimated that the bearing pad temperature has increased due to the large inclination of the thrust collar 23.

Further, when the adjustment of the end play is not appropriate and the gap is too narrow as a whole (that is, at any position in the circumferential direction), even if the inclination of the thrust collar 23 is small, the gap is narrow. Even if the thrust collar 23 is not inclined, the detection temperature T ₁ or the detection temperature T ₂ becomes equal to or higher than the set temperature T ₀ , or the detection temperature T ₁ and the detection temperature T ₂ become equal to or higher than the constant temperature T ₀ . May be.
In this case, the temperature difference ΔT between the detected temperature T ₁ and the detected temperature T ₂ is small. Therefore, if the temperature difference ΔT is smaller than the set temperature difference ΔT ₀ , the bearing pad temperature is not caused by the large inclination of the thrust collar 23 but the overall gap is too narrow due to insufficient adjustment of the end play. It can be estimated that it has risen.

Therefore, first, in the next step S3, the detected temperatures T ₁ and T ₂ input in step S2 are compared with the set temperature T _0, and the detected temperature T ₁ is equal to or higher than the set temperature T ₀ (T ₁ ≧ T ₀ ). Or whether the detected temperature T ₂ is equal to or higher than the set temperature T ₀ (T ₂ ≧ T ₀ ), or the detected temperature T ₁ and the detected temperature T ₂ are _{equal to} or higher than the set temperature T ₀ (T ₁ ≧ T ₀ and T ₂ ≧ T ₀ ).

If the determination result in step S3 is NO, that is, if it is determined that the detected temperatures T ₁ and T ₂ are not more than the set temperature T ₀ (T ₁ <T ₀ and T ₂ <T ₀ ), step S2 Then, the signals of the detected temperatures T ₁ and T ₂ are input again from the temperature sensors 61A and 61B.

On the other hand, if the decision result in the step S3 is YES, that is detected temperatures T ₁ and either or both of the detected temperature T ₂ is the set temperature T ₀ or more (T ₁ ≧ T _0, or, T ₂ ≧ T _0, or , T ₁ ≧ T ₀ and T ₂ ≧ T ₀ ), the process proceeds to the next step S4.

In step S4, a difference ΔT (T ₁ −T2 or T ₂ −T ₁ ) between the detected temperature T ₁ and the detected temperature T ₂ input in step S2 is calculated. That is, the detected temperature difference ΔT is detected from the temperature T _1, or higher T _2, if lower one minus the value of the detected temperatures T1, T2 (i.e., the difference between the detected temperatures T1, T2 Absolute value). Thereafter, the process proceeds to the next step S5.

In step S5, the detected temperature difference [Delta] T calculated in step S4, compared with the set temperature difference [Delta] T _0, whether or not the detected temperature difference [Delta] T is set a temperature difference [Delta] T ₀ or more (ΔT ≧ ΔT ₀₎ is determined .

If the determination result in step S5 is YES, that is, if it is determined that the detected temperature difference ΔT is greater than or equal to the set temperature difference ΔT ₀ (ΔT ≧ ΔT ₀ ), the process proceeds to the next step S6. That is, in this case, it can be presumed that the bearing pad temperature has increased because the thrust collar 23 is largely inclined and the load distribution of the bearing pads 32 is not uniform. Therefore, it progresses to step S6 and performs inclination adjustment.

That is, in step S6, the inclination of the bearing pad 3 is adjusted (gap adjustment) by adjusting the stroke of the hydraulic jack 31, thereby causing the bearing pad 32 to follow the inclination of the thrust collar 23 (that is, the thrust collar 23). The axial position of the bearing pad 12 is adjusted according to the inclination).
For example, when the detected temperature T ₁ is equal to or higher than the set temperature T ₀ (T ₁ ≧ T ₀ ) (that is, when the detected temperature T ₁ is higher than the detected temperature T ₂ ), the temperature becomes higher. The stroke of the hydraulic jack 31 closer to the bearing pad 32A is shortened, and the stroke of the hydraulic jack 31 closer to the bearing pad 32B having a lower temperature is lengthened. As a result, the bearing pad 32 </ b> A and the bearing pad 32 closer thereto are separated from the thrust collar 23, and the bearing pad 32 </ b> B and the bearing pad 32 closer thereto are closer to the thrust collar 23. As a result, since the bearing pad 32 follows the inclination of the thrust collar 23, the gap (the thickness of the oil film) at each position in the circumferential direction becomes uniform, and the share of the thrust load of each bearing pad 32 becomes uniform.
Conversely, when the detected temperature T ₂ is equal to or higher than the set temperature T ₀ (T ₂ ≧ T ₀ ) (that is, when the detected temperature T ₂ is higher than the detected temperature T ₁ ), the temperature is higher. The stroke of the hydraulic jack 31 closer to the bearing pad 32B becomes shorter, and the stroke of the hydraulic jack 31 closer to the bearing pad 32A whose temperature is lower becomes longer. As a result, the bearing pad 32 </ b> B and the bearing pad 32 closer thereto are separated from the thrust collar 23, and the bearing pad 32 </ b> A and the bearing pad 32 closer thereto are closer to the thrust collar 23. As a result, since the bearing pad 32 follows the inclination of the thrust collar 23, the gap (the thickness of the oil film) at each position in the circumferential direction becomes uniform, and the share of the thrust load of each bearing pad 32 becomes uniform.

Note that the stroke adjustment amount of each hydraulic jack 31 at this time is preset (input) to the control device 62. For example, the stroke adjustment amount of each hydraulic jack 31 may be set according to the detected temperatures T ₁ and T ₂ . Alternatively, a preset temperature difference ΔT ₀₁ smaller than the preset temperature difference ΔT ₀ is set (input) in the control device 62 in advance, and the stroke of each hydraulic jack 31 until the detected temperature difference ΔT becomes equal to or less than the preset temperature difference ΔT _01. May be adjusted (shorter or longer).

On the other hand, if the determination result in step S5 is NO, that is, if it is determined that the detected temperature difference ΔT is not greater than or equal to the set temperature difference ΔT ₀ (ΔT <ΔT ₀ ), the process proceeds to the next step S7. That is, in this case, it can be estimated that the adjustment of the end play is not appropriate and the gap is too narrow as a whole is the cause of the increase in the bearing pad temperature. Make adjustments.

  In step S7, end play adjustment is performed to widen the gap. That is, by adjusting (shortening) the strokes of all the hydraulic jacks 31, all the bearing pads 32 are separated from the thrust collar 23, thereby widening the gap as a whole.

Note that the stroke adjustment amount of each hydraulic jack 31 at this time is preset (input) to the control device 62. For example, the stroke adjustment amount of each hydraulic jack 31 may be set according to the detected temperatures T ₁ and T ₂ . Alternatively, a preset temperature T ₀₁ smaller than the preset temperature T ₀ is set (input) in the control device 62 in advance, and the detected temperature T ₁ or T ₂ or T ₁ and T _{2 that} is equal to or higher than the preset temperature T ₀ is The stroke of each hydraulic jack 31 may be adjusted (shortened) until the set temperature T ₀₁ or less.

  Other configurations of the thrust bearing device 22B of the second embodiment are the same as those of the thrust bearing device 22A (FIGS. 1 to 5) of the first embodiment.

  From the above, according to the thrust bearing device 22B of the second embodiment, it is possible to obtain the same operational effects as the thrust bearing device 22A of the first embodiment.

Furthermore, according to the thrust bearing device 22B of the _second embodiment, the temperature sensors 61A and 61B (temperature detecting means) for detecting the temperatures T ₁ and T ₂ of the bearing pads 32A and 32B and the temperature sensors 61A and 61B are used. Based on the detected temperatures T ₁ and T ₂ of the obtained bearing pads 32A and 32B, the controller 62 (hydraulic jack control) adjusts the gap by adjusting the stroke of the hydraulic jack 31 and adjusting the position of the bearing pad 32. Therefore, the stroke adjustment (i.e. clearance adjustment) of the hydraulic jack can be performed based on the temperature of the bearing pads 32A and 32B. For this reason, the burnout of the bearing pad 32 can be prevented more reliably, and the soundness of the thrust bearing device 22B is further improved.

Moreover, the control device 62 compares the detected temperatures T ₁ and T _{2 of the} two bearing pads 32A and 32B obtained by the temperature sensors 61A and 61B with the set temperature T ₀ , and as a result, detects the detected temperatures T ₁ and T _2. When it is determined that one or both of them is equal to or higher than the set temperature T ₀ , a difference ΔT between the detected temperatures T ₁ and T ₂ is calculated, and the detected temperature difference ΔT is compared with the set temperature difference ΔT _0. As a result, when it is determined that the detected temperature difference ΔT is equal to or greater than the set temperature difference ΔT ₀ , the inclination of the plurality of (eight in the illustrated example) bearing pads 32 is adjusted by adjusting the stroke of the hydraulic jack 31. On the other hand, when it is determined that the detected temperature difference ΔT is not equal to or greater than the set temperature difference ΔT ₀ , the strokes of the hydraulic jack 31 are adjusted (shortened) to adjust the number of bearing pads 32 (eight in the illustrated example). Adjust the position By, because it is characterized by comprising a controlling so as to widely generally to clearance, the detected temperature T _1, T ₂ as well, also taking into account the detected temperature difference [Delta] T (bearing pads Temperature It is determined whether the increase in the pressure is caused by the inclination of the thrust collar 23 or the end play being insufficiently adjusted), and the stroke of the hydraulic jack 31 is adjusted more accurately (that is, the gap is adjusted). be able to. For this reason, the burning of the bearing pad 32 can be prevented more reliably, and the soundness of the thrust bearing device 22B can be further improved.

In the above description, the case where the temperature sensors 61A and 61B are provided on the two upper and lower bearing pads 32A and 32B has been described. However, the present invention is not limited to this, and the present invention includes three or more (or all) bearings. The present invention can also be applied when a temperature sensor is provided on the pad 32.
In this case, the control device 62 selects, for example, any two detected temperatures T ₁ and T ₂ from the detected temperatures T of the three or more bearing pads 32 obtained by the temperature sensor, and detects these detected temperatures T 1. ₁ , T ₂ and the set temperature T ₀ , and as a result, one or both of the detected temperatures T ₁ , T ₂ are equal to or higher than the set temperature T ₀ (T ₁ ≧ T ₀ or T ₂ ≧ T ₀ , or , T ₁ ≧ T ₀ and T ₂ ≧ T ₀ ), a difference ΔT (absolute value) between the detected temperatures T ₁ and T ₂ is calculated, and the detected temperature difference ΔT and the set temperature difference are calculated. comparing the [Delta] T _0, the result, when it is determined that the detected temperature difference [Delta] T is set a temperature difference [Delta] T ₀ or more (ΔT ≧ ΔT _0), a plurality (shown example by adjusting the stroke of the hydraulic jack 31 8), the detected temperature difference ΔT is set to the set temperature difference ΔT _0. When it is determined that the above is not true (ΔT <ΔT ₀ ), the clearance is adjusted by adjusting (shortening) the stroke of the hydraulic jack 31 to adjust the positions of a plurality (eight in the illustrated example) of the bearing pads 32. Control may be performed so that the entire area is widened (end play adjustment).

Moreover, although the above demonstrated the case where the temperature sensor was provided in the several bearing pad 32, it is not necessarily limited to this, As long as it is a thrust bearing apparatus provided with the temperature sensor in at least one bearing pad. The present invention can be applied.
For example, if it can be predicted that the temperature of the uppermost bearing pad 32A will be the highest due to the inclination of the thrust collar 23, the temperature sensor 61A may be simply installed on the bearing pad 32A. The thrust bearing device of the case, on the basis of a temperature sensor 61A for detecting the temperature T ₁ of the bearing pads 32A (temperature detecting means), the detected temperature T ₁ of the bearing pads 32A obtained by the temperature sensor 61A, the hydraulic jack 31 The control device 62 (hydraulic jack control means) that adjusts the gap is obtained by adjusting the stroke of the bearing pad 32 and adjusting the position of the bearing pad 32. In this case, for example, when the detected temperature T ₁ of the temperature sensor 61A is compared with the set temperature T ₀ and, as a result, it is determined that the detected temperature T ₁ is equal to or higher than the set temperature T ₀ (T ₁ ≧ T ₀ ) It is possible to control to adjust the gap by adjusting the stroke of the jack 31 (that is, to adjust the inclination of the bearing pad 32 or to adjust the end play to widen the gap).

<Embodiment 3>
Based on FIG. 9, a thrust bearing device 22C according to Embodiment 3 of the present invention will be described. The outline of the overall configuration of the thrust bearing device 22C of the third embodiment is the same as the thrust bearing devices 22A and 22B (see FIGS. 1 and 2) of the first and second embodiments. Illustration and description here are omitted. Further, in the thrust bearing device 22C of the third embodiment, the same parts as those of the thrust bearing devices 22A and 22B (see FIGS. 1 to 8) of the first and second embodiments are denoted by the same reference numerals. In addition, overlapping explanation is omitted.

  As shown in FIG. 9, in the thrust bearing device 22B of the third embodiment, a displacement sensor 72 (displacement amount detection means), a variable throttle mechanism 72, and a control device 62 (hydraulic jack control means and variable throttle mechanism control). Means).

  The displacement sensor 71 is disposed so as to face the end surface 21b of the rotating shaft 21, detects the displacement amount W in the axial direction of the rotating shaft 21 as indicated by the arrow L, and outputs a signal of the detected displacement amount W. Output to the control device 62. The detected displacement amount W is a displacement amount from a predetermined reference position (for example, the position of the end surface 21b when the rotating shaft 21 is stopped). If the gap is excessively widened, the rotor (rotary shaft 21) of the steam turbine or gas turbine may be greatly displaced (ie, oscillated) in the axial direction, and the thrust bearing device 22C is damaged by this oscillation. There is a fear. Therefore, a displacement sensor 71 is provided to detect the occurrence of the swing.

  The variable throttle mechanism 72 is disposed in a supply line 55 of a hydraulic system that supplies the hydraulic oil 52 to the hydraulic jack 31. That is, the variable throttle mechanism 72 is provided on the upstream side of the hydraulic system of the hydraulic jack 31. The variable aperture mechanism 72 can also serve as a damper against vibration.

Therefore, the control device 62 compares the detected displacement amount W of the rotating shaft 21 input from the displacement sensor 71 with the set displacement amount W ₀ set (input) in advance in the control device 62, and the detected displacement amount W is calculated. When the set displacement amount W ₀ or more is reached, by adjusting the aperture amount of the variable aperture mechanism 72, the axial rotation of the rotary shaft 21 is suppressed. That is, by adjusting the aperture amount of the variable aperture mechanism 72 and adjusting the attenuation coefficient of the variable aperture mechanism 72 serving as a damper, the axial rotation of the rotary shaft 21 is suppressed.

Note that the aperture amount (adjustment amount) of the variable aperture mechanism 72 at this time is preset (input) to the control device 62. In this case, the aperture amount (adjustment amount) of the variable aperture mechanism 72 may be set according to the magnitude of the detected displacement amount W. Alternatively, a preset displacement amount W ₀₁ smaller than the preset displacement amount W ₀ is set (input) in the control device 62 in advance, and the aperture of the variable aperture mechanism 72 is reduced until the detected displacement amount W becomes equal to or less than the set displacement amount W _01. The amount may be adjusted.

  Other configurations of the thrust bearing device 22C of the third embodiment are the same as those of the thrust bearing devices 22A and 22B (FIGS. 1 to 8) of the first and second embodiments.

  From the above, according to the thrust bearing device 22C of the third embodiment, the same effects as the thrust bearing devices 22A and 22B of the first and second embodiments can be obtained.

Moreover, according to the thrust bearing device 22C of the third embodiment, the variable throttle mechanism 72 provided on the supply line 55 of the hydraulic system that supplies the hydraulic oil 52 to the hydraulic jack 31 and the axial displacement of the rotary shaft 21. When the displacement sensor 71 for detecting the amount W and the displacement amount W in the axial direction of the rotary shaft 21 detected by the displacement sensor 71 are equal to or larger than the set displacement amount ΔW ₀ , the diaphragm amount of the variable diaphragm mechanism 72 is adjusted. Therefore, the control device 62 is provided that suppresses the swinging of the rotating shaft 21 in the axial direction. Therefore, not only the inclination of the bearing pad 32 can be adjusted by the hydraulic jack 31, but also a variable throttle mechanism. The swinging of the rotating shaft 21 can be suppressed by 72.

The thrust bearing device of the present invention is useful when applied to a thrust bearing device installed on a rotating shaft of a rotor of a steam turbine or a gas turbine, but is not limited to this, and various rotating bodies The present invention can be applied to a thrust bearing device installed on the rotating shaft.
In the first to third embodiments, an example of a thrust bearing device having eight bearing pads is shown. However, the present invention is not limited to this example, and the present invention is not limited to eight (for example, six). The present invention can also be applied to a thrust bearing device having 10 or 12 bearing pads.

  The present invention relates to a thrust bearing device provided on a rotating shaft of a rotating body such as a rotor of a steam turbine or a gas turbine, and only a leveling mechanism constituted by an upper leveling plate and a lower leveling plate. This is useful when the bearing pad is likely to be able to follow the inclination of the thrust collar.

21 Rotating shaft 21a Outer peripheral surface 21b End surface 22A, 22B, 22C Thrust bearing device 23 Thrust collar 23a Side surface 24 Bearing portion 31 Hydraulic jack 31a Main body 31b Rod 31b-1 Tip surface 32, 32A, 32B Bearing pad 32a Surface 32b Protruding portion 32c 33 pillar 33a surface 33b rear surface 33c convex portion 34 upper leveling plate 34a surface 34b concave portion 34c end portion 35 lower leveling plate 35a end portion 35b rear surface 36 oil supply piece 36a oil supply hole 41 housing 41a back cover 51 tank 52 hydraulic oil 53 Hydraulic pump 54 Relief valve 55 Supply line 55a Branch line 56 Controller 61A, 61B Temperature sensor 62 Controller 71 Displacement sensor 72 Variable throttle mechanism

Claims (3)

A disk-shaped thrust collar protruding from the outer peripheral surface of the rotating shaft of the rotating body is supported by a pair of bearing portions disposed on both sides of the thrust collar, and the bearing portion is a circle of the rotating shaft. A plurality of bearing pads arranged in the circumferential direction and opposed to the side surface of the thrust collar via a gap, and a plurality of upper leveling plates and a plurality of lower leveling plates disposed on the back side of the bearing pad. A thrust bearing device having a structure including a leveling mechanism for the bearing pad.
A hydraulic jack is installed on the back surface of the lower leveling plate, and a thrust load applied from the thrust collar to the bearing pad through the oil film in the gap is transmitted to the hydraulic pressure via the upper leveling plate and the lower leveling plate. It is configured to receive with a jack ,
Temperature detecting means for detecting the temperature of two of the plurality of bearing pads;
When the detected temperature of the two bearing pads obtained by the temperature detecting means is compared with a set temperature, and as a result, when it is determined that one or both of the detected temperatures are equal to or higher than the set temperature, The difference between the detected temperatures is calculated, the detected temperature difference is compared with the set temperature difference, and as a result, when it is determined that the detected temperature difference is equal to or greater than the set temperature difference, the stroke of the hydraulic jack is set. While adjusting the inclination of the plurality of bearing pads by adjusting, if it is determined that the detected temperature difference is not greater than the set temperature difference, the plurality of bearing pads is adjusted by adjusting the stroke of the hydraulic jack. Hydraulic jack control means for controlling the gap to be widened as a whole by adjusting the position of
A thrust bearing device according to claim <br/> further comprising a. The thrust bearing device according to claim 1,
Temperature detecting means for detecting the temperature of at least one of the plurality of bearing pads;
Hydraulic jack control means for adjusting the clearance by adjusting the stroke of the hydraulic jack and adjusting the position of the bearing pad based on the detected temperature of the at least one bearing pad obtained by the temperature detection means. When,
A thrust bearing device comprising: The thrust bearing device according to claim 1 or 2 ,
A variable throttle mechanism provided in a supply line of a hydraulic system for supplying hydraulic oil to the hydraulic jack;
A displacement amount detecting means for detecting a displacement amount of the rotating shaft in the axial direction;
When the displacement amount in the axial direction of the rotary shaft detected by the displacement amount detection means becomes equal to or greater than a set displacement amount, the swing amount in the axial direction of the rotary shaft is adjusted by adjusting the throttle amount of the variable throttle mechanism. Variable aperture mechanism control means for suppressing
A thrust bearing device comprising:

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