JP2012172729A - Bearing device and rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device, capable of efficiently recovering carry-over oil and efficiently supplying new lubricant to a gap between a bearing pad and a rotary shaft.SOLUTION: The bearing device includes: a plurality of bearing pads 14 each including a bearing surface 13 positioned to face a supported surface 11 of the rotary shaft 12 with a gap, the bearing pads being arranged at intervals along the circumferential direction of the rotary shaft 12; a first supply unit 21 disposed in a space part P each between the adjacent bearing pads 14 to supply lubricant to the gap between the bearing surface 13 of the downstream bearing pad 14 in the rotating direction of the rotary shaft 12 and the supported surface 11; and a regulation member 20 provided in the space part P so as to extend along the rotating direction of the rotary shaft 12, the regulating member regulating lubricant, which is released from the gap between the bearing surface 13 of the upstream bearing pad 14 and the supported surface 11 and entered to the space part P, from flowing into the gap between the bearing surface 13 of the downstream bearing pad 14 and the supported surface 11.

Description

  The present invention relates to a bearing device that supports a rotating shaft and a rotating machine including the bearing device.

  Conventionally, tilting pad bearings are well known as bearing devices applied to large rotating machines such as steam turbines, gas turbines, and nuclear turbines. In addition, as such a tilting pad bearing, a plurality of bearing pads are arranged at intervals along the circumferential direction of the rotating shaft, and an oil supply box is installed between them, and the oil supply box also serves as cooling. There is known a technique for supplying the lubricating oil into the gap between the bearing pad and the rotating shaft (for example, see Patent Document 1).

US Patent Application Publication No. 2008/0013872

  However, in the above-described bearing device, there has been a problem that a sufficient cooling effect cannot be obtained in response to the recent demand for larger and faster rotating machines.

  This is because when the rotating machine is increased in size, the peripheral speed of the rotating shaft increases, and if only lubricating oil is supplied, including heat transfer from the rotating shaft, it is released from the gap between the bearing pad on the upstream side and the rotating shaft. High temperature lubricating oil (carryover oil) stays between adjacent bearing pads, and this carryover oil and new lubricating oil supplied from the oil supply box are mixed between adjacent bearing pads. This is easily caused by the fact that new lubricating oil having a low temperature cannot be supplied to the gap between the bearing pad on the downstream side and the rotating shaft.

  The present invention has been made in view of such circumstances, and its purpose is to efficiently recover carry-over oil and to supply new lubricating oil efficiently to the gap between the bearing pad and the rotating shaft. It is an object of the present invention to provide a bearing device that can be used.

  In order to achieve the above object, the present invention employs the following means. That is, the bearing device according to the present invention includes a bearing surface that is disposed to face a supported surface of the rotating shaft with a gap therebetween, and a plurality of members that are disposed at intervals along the circumferential direction of the rotating shaft. A bearing pad and a space between the bearing pads adjacent to each other of the plurality of bearing pads are disposed in a gap between the bearing surface of the bearing pad and the supported surface on the downstream side in the rotation direction of the rotating shaft. A first supply part for supplying lubricating oil; and a gap between the bearing surface of the bearing pad on the upstream side and the supported surface provided in the space part so as to extend along the rotation direction of the rotary shaft. And a regulating member that regulates that the lubricating oil that has been discharged from the fluid and flowed into the space portion flows into the gap between the bearing surface and the supported surface of the bearing pad on the downstream side. And

  According to such a configuration, the carry-over oil discharged from the gap between the upstream bearing surface and the supported surface and flowing into the space portion is caused by the restriction member to the gap between the downstream bearing surface and the supported surface. Inflow is regulated. Therefore, carry-over oil can be efficiently recovered, and new lubricating oil free of carry-over oil can be efficiently supplied to the gap between the bearing surface of the bearing pad and the supported surface of the rotary shaft.

  Further, in the bearing device according to the present invention, the regulating member includes an inclined surface that is inclined so as to be separated from the supported surface from the upstream side toward the downstream side on the back surface side of the surface facing the supported surface. It is characterized by.

  According to such a configuration, the lubricating oil discharged from the gap between the bearing surface and the supported surface of the bearing pad on the upstream side and flowing into the space portion is separated from the supported surface by the inclined surface of the regulating member. Since it is guided in the separating direction, it is possible to further restrict the carry-over oil from flowing into the gap between the downstream bearing surface and the supported surface.

  Further, the bearing device according to the present invention is characterized in that the first supply unit is disposed at a position farther from the supported surface than the bearing surface of the bearing pad on the downstream side.

  According to such a configuration, since the first supply unit is separated from the supported surface, the lubricating oil sprayed from the first supply unit is prevented from splashing around the supported surface and scattering around the first supply unit. An oil sump is formed around the supply section. Thereby, the lubricating oil injected from the 1st supply part can be efficiently supplied with respect to the clearance gap between a to-be-supported surface and the bearing surface of a downstream bearing pad.

  In the bearing device according to the present invention, the inflow guide is inclined at the upstream end of the bearing surface of the bearing pad on the downstream side so as to approach the supported surface from the upstream side toward the downstream side. A surface is formed.

  According to such a configuration, it is possible to secure a wide gap near the entrance between the bearing surface and the supported surface of the bearing pad on the downstream side, and the gap becomes narrower toward the downstream. The lubricating oil supplied from one supply part can be taken in efficiently from the upstream side to the downstream side of the gap between the bearing surface and the supported surface.

  Further, the bearing device according to the present invention is characterized in that the space portion is provided with a second supply portion that ejects lubricating oil toward the bearing pad on the upstream side.

  According to such a configuration, the downstream end portion of the upstream bearing pad can be cooled by the lubricating oil ejected from the second supply portion.

  Further, the bearing device according to the present invention is characterized in that a third supply unit that ejects lubricating oil toward the supported surface is provided upstream of the first supply unit.

  According to such a structure, the to-be-supported surface of a rotating shaft can be cooled with the lubricating oil ejected from the 3rd supply part.

  Further, in the bearing device according to the present invention, a box body in which a retaining portion for retaining the lubricating oil is disposed in the space portion, and the lubricating oil is disposed on the inner surface of the retaining portion on the axis of the rotary shaft. An oil guide for guiding in a direction is provided.

  According to such a configuration, the lubricating oil released from the gap between the bearing surface of the upstream bearing pad and the supported surface by the oil guide formed in the staying portion and flowing into the space portion is allowed to flow in the axial direction of the rotating shaft. To the outside from the end of the box body.

  Moreover, the rotary machine which concerns on this invention is provided with the bearing apparatus which concerns on this invention, and the rotating shaft supported rotatably by this bearing apparatus, It is characterized by the above-mentioned.

  According to such a configuration, the failure occurrence rate can be reduced by easily and reliably suppressing the temperature of the bearing device from rising, and therefore the reliability of the entire rotating machine can be improved.

  According to the bearing device according to the present invention, the carry-over oil can be efficiently recovered, and new lubricating oil can be efficiently supplied to the gap between the bearing pad and the rotating shaft.

It is the figure which represented typically the steam turbine which is one of the embodiment of the rotary machine which concerns on this invention. The bearing apparatus which concerns on one Embodiment of this invention is shown, (A) is a perspective view of a bearing apparatus, (B) is a top view of a bearing apparatus. Example 1 of the bearing apparatus of one Embodiment of this invention is shown, (A) is a perspective view of a lubricating oil supply box, (B) is sectional drawing of the principal part. Example 2 of the bearing apparatus of one Embodiment of this invention is shown, (A) is a perspective view of a lubricating oil supply box, (B) is sectional drawing of the principal part. Embodiment 2 of the bearing device of the present invention is shown, (A) is a development view of the bottom shape of the staying portion, (B) is a sectional view of the bottom portion of the staying portion, and (C) is another sectional view of the bottom surface of the staying portion. It is a perspective view of the principal part which shows Example 3 of the bearing apparatus of this invention.

  Next, a rotating machine according to an embodiment of the present invention will be described with reference to the drawings. In addition, although the Example shown below is a suitable specific example in the rotary machine of this invention, and there may be various technically preferable restrictions, the technical scope of this invention limits this invention especially. Unless otherwise stated, the present invention is not limited to these embodiments. In addition, the constituent elements in the embodiments shown below can be appropriately replaced with existing constituent elements and the like, and various variations including combinations with other existing constituent elements are possible. Therefore, the description of the embodiment described below does not limit the contents of the invention described in the claims.

[Rotating machinery]
First, as an embodiment of a rotating machine according to the present invention, a steam turbine 100 will be described with reference to FIG. The rotating machine can be configured as a gas turbine, a nuclear turbine, or the like other than the steam turbine 100 of the present embodiment.
As shown in FIG. 1, a steam turbine 100 (rotary machine) is a prime mover that obtains power by applying fluid such as steam or gas to an impeller (moving blade) to convert fluid energy into rotational motion. As a schematic configuration, a turbine main body 110 having a plurality of impellers, a rotating shaft 12 that has an outer peripheral surface as a supported surface 11 and outputs power generated in the turbine main body 110, and the rotating shaft 12 can be rotated in the radial direction. A journal bearing device 10 (bearing device) for supporting, and a thrust bearing device 10 ′ (bearing device) for supporting the rotating shaft 12 in the axial direction so as to be axially rotatable are provided.

  The turbine main body 110 is a power generation unit that generates power when a fluid flows in and impinges on an impeller. As a schematic configuration thereof, for example, a plurality of moving blades (impellers) protruding from the rotary shaft 12; A casing that houses a plurality of moving blades, and a stationary blade that protrudes from the inner peripheral surface of the casing. The plurality of moving blades are radially arranged around the rotating shaft 12, and the plurality of moving blades and the plurality of stationary blades are alternately arranged in the axial direction.

[Bearing device]
FIG. 1 shows a journal bearing device according to an embodiment of the present invention, in which (A) is a perspective view of the journal bearing device, and (B) is a plan view of the journal bearing device. In FIG. 1, a journal bearing device 10 has a bearing surface 13 opposed to the supported surface 11 of the rotating shaft 12 with a gap on the inner periphery, and is arranged at a plurality of intervals along the circumferential direction of the rotating shaft 12. The bearing pad 14, the annular casing 15 that supports and accommodates the bearing pad 14 from the outer peripheral side in the radial direction, and the space between the adjacent bearing pads 14 of the bearing pad 14 are provided in the casing 15. And a plurality of lubricating oil supply boxes 17 fixed to the casing 15 so that the lubricating oil is supplied from the lubricating oil supply port 16.

  In addition, since the structure etc. of the casing 15 mentioned above and the lubricating oil supply port 16 can apply a well-known thing, in the following description, the specific Example of the bearing pad 14 and the lubricating oil supply box 17 is demonstrated. To do.

Example 1
2A and 2B show Example 1 of the bearing device according to the embodiment of the present invention, in which FIG. 2A is a perspective view of a lubricating oil supply box, and FIG.

  As shown in FIG. 2, the lubricating oil supply box 17 has a bearing pad 14 (hereinafter, simply referred to as “upstream side”) arranged on the upstream side in the rotation direction of the rotary shaft 12 (hereinafter, simply referred to as “upstream side”). And a bearing pad 14 (hereinafter referred to as “downstream pad 14B”) disposed on the downstream side in the rotation direction (hereinafter simply referred to as “downstream side”). It arrange | positions in the space part P between. The lubricating oil supply box 17 is made of a metal or a resin having high heat resistance, and extends along the axial direction of the rotating shaft 12 so as to open to the side facing the supported surface 11 of the rotating shaft 12. A substantially U-shaped box body 18 is provided.

  The box body 18 has a stepped portion 19 formed of a stepped surface dropped in a direction away from the supported surface 11 at a wide open end positioned on the downstream side, and a rotary shaft on the open end positioned on the upstream side. A restricting member 20 extending along the rotational direction 12 is formed.

  A first supply unit 21 that ejects the lubricating oil toward the supported surface 11 side is provided on the lower step surface 19 a of the stepped portion 19. Further, a second supply portion 22 that ejects lubricating oil toward the upstream side pad 14 </ b> A is formed on the vertical wall surface located on the upstream side of the box body 18. Furthermore, a third supply portion 23 that ejects lubricating oil toward the supported surface 11 is provided on the upper surface 19 b of the step portion 19.

  The first supply unit 21 supplies lubricating oil to the gap between the bearing surface 13 and the supported surface 11 of the downstream pad 14B from the position adjacent to the downstream pad 14B. Moreover, the 1st supply part 21 is arrange | positioned in the position spaced apart from the to-be-supported surface 11 rather than the bearing surface 13 of the downstream pad 14B by opening in nozzle shape at the lower step surface 19a. At this time, an inflow guide surface 13a that is inclined so as to approach the supported surface 11 from the upstream side toward the downstream side is formed at the upstream end portion of the bearing surface 13 of the downstream side pad 14B. The lowermost portion of the inflow guide surface 13a and the first supply unit 21 are separated from the supported surface 11 by substantially the same distance.

  The second supply unit 22 ejects lubricating oil from the upstream wall surface of the box body 18 toward the upstream pad 14A wall surface. At this time, the second supply unit 22 is located near the portion of the upstream pad 14A where the temperature is highest, that is, near the discharge port from which the lubricating oil is ejected from the gap between the bearing surface 13 and the supported surface 11 of the upstream pad 14A. Lubricating oil is spouted toward the wall surface. Thereby, the second supply unit 22 can cool an area near the highest temperature of the upstream pad 14A, and at the same time, can form an oil curtain made of lubricating oil between the upstream pad 14A and the box body 18, Carry-over oil released from the gap between the bearing surface 13 of the upstream pad 14A and the supported surface 11 can be prevented from entering between the upstream pad 14A and the box body 18.

  The 3rd supply part 23 spouts lubricating oil by opening on the upper stage surface 19b upstream from the 1st supply part 21 close | similar to the downstream pad 14B in nozzle shape. As a result, the third supply unit 23 ejects the lubricating oil toward the supported surface 11 from a position upstream of the first supply unit 21 and close to the supported surface 11. Accordingly, the supported surface 11 is cooled by the lubricating oil ejected from the third supply section 23, and at the same time, the carry-over oil released from the gap between the bearing surface 13 of the upstream pad 14A and the supported surface 11 is on the downstream side. An oil curtain that restricts the flow into the gap between the bearing surface 13 of the pad 14B and the supported surface 11 can be configured, and the lubricating oil and the carry-over oil from the first supply unit 21 are mixed. Can be suppressed.

  In addition, although the 1st supply part 21, the 2nd supply part 22, and the 3rd supply part 23 are arrange | positioned in several places along the axial direction of the rotating shaft 12 in a present Example, the position, the number of installation, open A diameter, an opening shape (for example, a circle, an ellipse, a slit shape, etc.) and the like can be appropriately set according to the diameter (or peripheral speed) of the rotating shaft 12, the amount of jetted lubricant, and the like.

  In the first embodiment, the regulating member 20 extends from the open end located on the upstream side of the box body 18 so as to project toward the downstream side over the entire width along the axial direction of the rotary shaft 12. As a result, the restricting member 20 narrows the opening 24 at the open end by the overhang, and the lubricating oil flowing in from the upstream side is retained in the restricting member 20 toward both ends (the vertical direction in FIG. 3A). Thus, a staying portion 25 for sending out the lubricating oil is formed. Further, an inclined surface 20 a is formed on the inner surface of the regulating member 20 so as to be separated from the supported surface 11 as it goes from the upstream side to the downstream side. As a result, the regulating member 20 opens the lubricating oil (carry over oil) released toward the downstream side with the rotation of the rotary shaft 12 from the gap between the bearing surface 13 of the upstream side pad 14A and the supported surface 11. 24 while taking into the staying portion 25 and forming a vortex (see arrow A in FIG. 3B) in a direction away from the supported surface 11 so as not to leak from the opening 24 while being guided by the inclined surface 20a. It can be discharged from both ends (see arrow B in FIG. 3A). Therefore, the lubricating oil that has flowed into the staying portion 25 that is the region on the opposite side of the supported surface 11 can be restricted from flowing toward the supported surface 11 on the downstream side.

  In the above configuration, the upstream pad 14A is cooled from the clearance between the bearing surface 13 of the upstream pad 14A and the supported surface 11 as the rotary shaft 12 rotates (see the thick arrow in FIG. 3B). High temperature lubricating oil is released as carry-over oil.

  Since this carry-over oil is suppressed from entering the space P between the upstream pad 14A and the box body 18 by the lubricating oil ejected from the second supply portion 22, a part of the carry-over oil is opened in the opening 24. From the both ends of the box body 18 to the outside by the regulation member 20 and its inclined surface 20a to form a vortex (see arrow A in FIG. 3B). (See arrow B in FIG. 3A).

  On the other hand, the other part of the carry-over oil goes to the downstream side without being guided from the opening 24 to the staying part 25, but goes further downstream by the lubricating oil ejected from the third supply part 23. This is prevented and returned from the opening 24 to the staying portion 25 (see arrow C in FIG. 3B).

  Further, since the lower step surface 19a of the stepped step portion 19 is low, the lubricating oil ejected from the first supply portion 21 is prevented from splashing around the supported surface 11 and being scattered around the first supply portion 21. An oil sump is formed around the. Thereby, the lubricating oil injected from the 1st supply part 21 can be efficiently supplied with respect to the clearance gap between the to-be-supported surface 11 and the bearing surface 13 of the downstream pad 14B.

  In addition, an inflow guide surface 13a is formed at the upstream end of the downstream pad 14B into which the new lubricating oil flows, so that the lowermost portion is inclined at substantially the same height as the lower step surface 19a. In combination, the lubricating oil can be supplied to the gap between the bearing surface 13 and the supported surface 11 of the downstream pad 14B more efficiently (see arrow D in FIG. 3B).

(Example 2)
4 and 5 show a second embodiment of the bearing device of the present invention. FIG. 4 (A) is a perspective view of a lubricating oil supply box, FIG. 4 (B) is a cross-sectional view of the main part, and FIG. FIG. 5B is a sectional view of the bottom of the staying portion, and FIG. 5C is another sectional view of the bottom of the staying portion.

  In addition, the same code | symbol is attached | subjected to the structure same as the said Example 1, and the description is abbreviate | omitted. In the second embodiment, a lubricating oil supply box 27 different from the lubricating oil supply box 17 shown in the first embodiment is disposed in the space P between the upstream pad 14A and the downstream pad 14B. 1, the same supply unit as the first supply unit 21, the second supply unit 22, and the third supply unit 23 is provided.

  In FIG. 4, the lubricating oil supply box 27 is made of a metal or a resin having high heat resistance, and extends along the axial direction of the rotating shaft 12 and is opened to the side facing the supported surface 11 of the rotating shaft 12. The box main body 28 having a substantially U-shaped cross section is provided.

  At an open end located on the upstream side of the box body 28, a regulating member 30 is formed that projects from the upstream side toward the downstream side.

  The restricting member 30 narrows the opening 34 at the open end by the overhang, and both ends of the box main body 28 while retaining the lubricating oil flowing in from the upstream side (the vertical direction in FIG. 4A). The retention part 35 which sends out lubricating oil toward is formed. In addition, the retaining portion 35 is formed in a substantially circular cross section, and is lubricant oil discharged toward the downstream side as the rotary shaft 12 rotates from the gap between the bearing surface 13 of the upstream pad 14A and the supported surface 11. (Carry over oil) is swirled. Further, the inclined surface 30a formed on the back surface of the regulating member 30 and the bottom wall of the staying portion 35 facing the opening 34, as shown in FIG. 5A, carry-over taken into the staying portion 35 from the opening 34. The oil vortex is efficiently discharged from both ends of the box main body 28 without returning to the main flow, that is, the box is symmetrical with respect to the longitudinal direction of the box main body 28 (width direction along the axial direction of the rotating shaft 12). An oil guide 36 that is inclined so as to define the direction in which the lubricating oil is discharged is formed by spreading toward both ends of the main body 28. Therefore, in the second embodiment, the inclined surface 30a formed on the back surface of the regulating member 30 is formed following the substantially circular cross section, but as in the first embodiment, it faces from the upstream side to the downstream side. It may be inclined so as to be separated from the supported surface 11 (see the chain line in FIG. 4B). The oil guide 36 may be formed by a groove as shown in FIG. 5 (B), or may be formed by a convex portion as shown in FIG. 5 (C).

  In the above configuration, a part of the carry-over oil is guided from the opening 34 to the staying portion 35, and a vortex (see an arrow A in FIG. 4B) is generated by the cross-sectional shape of the staying portion 35 and the shape of the oil guide 36. The box body 28 is efficiently discharged from both ends to the outside (see arrow B in FIG. 5A).

(Example 3)
FIG. 6 is a perspective view of an essential part showing Embodiment 3 of the bearing device of the present invention. Although the example applied to the journal bearing device 10 is shown in the first embodiment and the second embodiment, the example applied to the thrust bearing device 10 ′ is shown in the third embodiment. In addition, the same code | symbol is attached | subjected to the structure substantially the same as the said Examples 1, 2, and the description is abbreviate | omitted. In the third embodiment, a lubricating oil supply box 37 different from the lubricating oil supply boxes 17 and 27 shown in the first and second embodiments is arranged in the space P between the upstream pad 14A and the downstream pad 14B. The first supply unit 21, the second supply unit 22, and the third supply unit 23 shown in the first embodiment are provided with substantially the same supply unit.

  In FIG. 6, the upstream pad 14 </ b> A and the downstream pad 14 </ b> B support the end surface of the disk D that is fixed to the rotating shaft 12 and rotates integrally as shown in FIG. 1. Accordingly, the upstream pad 14A and the downstream pad 14B support the end surface of the disk D, which is the supported surface, with the upper surface shown in the figure as the bearing surface 13.

  The lubricating oil supply box 37 is made of a metal or a resin having high heat resistance, and includes a box body 38 having a substantially U-shaped cross section that opens to the side facing the disk D and the outer peripheral side of the rotary shaft 12. .

  The box body 38 has a stepped portion 39 formed of a stepped surface dropped in a direction away from the end surface of the disk D at the wide open end located on the downstream side, and the upstream end located on the upstream side A restricting member 40 is formed so as to project toward the downstream side.

  A first supply portion 21 that ejects the lubricant toward the supported surface is provided on the lower step surface 39a of the step portion 39, and a third supply that ejects the lubricant toward the end surface of the disk D is provided on the upper step surface 39b. A portion 23 is provided. Further, the upper surface 39b has a substantially triangular shape in plan view so that the opening width on the rotation axis side (inner peripheral side) of the opening 44 is narrow and the opening width on the casing side (outer peripheral side) is wide. The 3rd supply part 23 is formed ranging over the substantially whole surface.

  As a result, the opening 44 is narrow on the inner peripheral side and wider on the outer peripheral side, so that the lubricating oil that has flowed into the staying portion 45 is guided by the inclined surface 40a and forms a vortex that does not leak out of the opening 44 However, it can discharge | emit (refer arrow B of FIG. 6), making it a vortex | eddy current toward the end surface of an outer peripheral side from an inner peripheral side.

10 ... Journal bearing device (bearing device)
10 '... Thrust bearing device (bearing device)
DESCRIPTION OF SYMBOLS 11 ... Supported surface 12 ... Rotary shaft 13 ... Bearing surface 13a ... Inflow guide surface 14 ... Bearing pad 14A ... Upstream side pad 14B ... Downstream side pad 15 ... Casing 16 ... Lubricating oil supply port 17 ... Lubricating oil supply box 20 ... Restriction Member 20a ... inclined surface 21 ... first supply unit 22 ... second supply unit 23 ... third supply unit 100 ... steam turbine 110 ... turbine body D ... disk

Claims (8)

A plurality of bearing pads provided with bearing surfaces arranged to face the supported surface of the rotating shaft with a gap therebetween, and arranged at intervals along the circumferential direction of the rotating shaft;
Lubricating oil is disposed in a space between the bearing pads adjacent to each other of the plurality of bearing pads, and supplies lubricating oil to a gap between the bearing surface and the supported surface of the bearing pad on the downstream side in the rotation direction of the rotating shaft. A first supply unit that
Lubrication that is provided in the space portion so as to extend along the rotation direction of the rotation shaft, and is discharged from a gap between the bearing surface and the supported surface of the bearing pad on the upstream side and flows into the space portion. A restricting member that restricts oil from flowing into the gap between the bearing surface of the bearing pad on the downstream side and the supported surface;
A bearing device comprising:   The said regulating member is provided with the inclined surface which inclined so that it might separate from the said supported surface toward the downstream from the upstream from the back surface side of the surface facing the said supported surface. The bearing device described in 1.   3. The bearing device according to claim 1, wherein the first supply unit is disposed at a position farther from the supported surface than the bearing surface of the bearing pad on the downstream side.   The upstream end portion of the bearing surface of the bearing pad on the downstream side is formed with an inflow guide surface that is inclined so as to approach the supported surface from the upstream side toward the downstream side. The bearing device according to any one of claims 1 to 3.   The bearing device according to any one of claims 1 to 4, wherein a second supply portion that ejects lubricating oil toward the bearing pad on the upstream side is provided in the space portion. .   6. The third supply unit according to claim 1, wherein a third supply unit that ejects lubricating oil toward the supported surface is provided upstream of the first supply unit. Bearing device.   The space body is provided with a box body in which a retention portion for retaining the lubricating oil is formed, and an oil guide for guiding the lubricating oil in the axial direction of the rotating shaft is provided on the inner surface of the retention portion. The bearing device according to any one of claims 1 to 6, wherein the bearing device is provided. A bearing device according to any one of claims 1 to 7,
A rotating shaft rotatably supported by the bearing device;
A rotating machine comprising:

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