JP2016145589A - Journal bearing and rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a journal bearing capable of suppressing agitation loss by a lubrication oil filled between two bearing pads.SOLUTION: A journal bearing includes: a cylindrical carrier ring; at least two bearing pads provided on an inner peripheral side of the carrier ring, and constituted so as to support a rotor shaft; at least one oil supply unit provided on the inner peripheral side of the carrier ring, and for supplying a lubrication oil between the bearing pads and the rotor shaft; and a pair of side plates installed along an outer periphery of the rotor shaft on an axial direction one end part and the other end part of the carrier ring. The journal bearing also has at least one opening which is constituted so as to open a bearing internal space surrounded by at least the two bearing pads and the pair of side plates to the atmosphere, and to discharge the lubrication oil to the outside from the bearing internal space.SELECTED DRAWING: Figure 5

Description

  The present disclosure relates to journal bearings and rotating machines.

Journal bearings used in rotating machines such as steam turbines, gas turbines, blowers, and compressors are widely known.
For example, Patent Document 1 discloses a journal bearing including a carrier ring, two bearing pads, and a plurality of oiling nozzles. The oil supply nozzle supplies the supplied lubricating oil between the outer peripheral surface of the rotor shaft and the inner peripheral surface of the bearing pad.

Japanese Patent No. 4764486

  The present inventors have found that in the journal bearing disclosed in Patent Document 1, it may be difficult to form an oil film having a sufficient thickness on the bearing pad. In particular, when the surface pressure of the rotor shaft relative to the bearing pad is low or the rotor shaft rotates in a low rotation region, it has become clear that it is difficult to ensure a sufficient oil film thickness of the bearing pad.

  In view of the above circumstances, at least one embodiment of the present invention provides a journal bearing and a rotary machine that can sufficiently secure the oil film thickness in the bearing pad and that can suppress an increase in stirring resistance of the rotor shaft. The purpose is to provide.

(1) A journal bearing according to at least one embodiment of the present invention includes:
A cylindrical carrier ring;
At least two bearing pads provided on the inner peripheral side of the carrier ring and configured to support the rotor shaft;
At least one oil supply unit that is provided on the inner peripheral side of the carrier ring and supplies lubricating oil between the bearing pad and the rotor shaft;
A pair of side plates installed along the outer periphery of the rotor shaft at one end and the other end in the axial direction of the carrier ring;
With
At least one opening configured to open the bearing inner space surrounded by the at least two bearing pads and the pair of side plates to the atmosphere and to discharge the lubricating oil from the bearing inner space to the outside. Have.

As a result of intensive studies by the present inventors, for example, the cause of the problem of insufficient oil film thickness of the first bearing pad in the conventional journal bearing described in Patent Document 1 is the lack of lubricating oil that is carried over to the bearing pad. I found out. That is, the journal bearing has a bearing inner space surrounded by a pair of side plates between the inner peripheral surface of each side plate and the outer peripheral surface of the rotor shaft, in addition to the fact that the lubricant is not easily carried over due to the head difference. There is a gap for communicating with the outside, and lubricating oil is likely to leak. For this reason, the lubricating oil carried over to the first bearing pad is reduced, and the amount of lubricating oil carried over to the first bearing pad is insufficient. Therefore, even if the amount of discharged oil is the same between the first oil supply unit immediately before the upstream side of the first bearing pad and the second oil supply unit immediately before the upstream side of the second bearing pad, compared to the second bearing pad. The first bearing pad tends to be short of lubricating oil. In particular, when the surface pressure of the rotor shaft with respect to the first bearing pad and the second bearing pad is low, or when the rotor shaft rotates in a low rotation region, the lubricating oil carried over to the first bearing pad is small. The lack of lubricating oil in the first bearing pad is significant. When the lubricating oil supplied to the first bearing pad is insufficient, the first bearing pad does not get wet from the inlet, and therefore the oil film pressure generation region is narrowed, and the oil film of the first bearing pad becomes thin. As a result, when the surface pressure of the rotor shaft relative to the first bearing pad and the second bearing pad is low or the rotor shaft rotates in the low rotation region, the axis of the rotor shaft deviates from the vertical line and the journal. The isotropy of the bearing may be impaired.
On the other hand, if the gap between the outer peripheral surface of the rotor shaft and the inner peripheral surface of the side plate is narrowed, the amount of lubricating oil leaking from between the outer peripheral surface of the rotor shaft and the inner peripheral surface of the side plate can be reduced. Lubricating oil may fill the bearing internal space and increase the stirring resistance of the rotor shaft.

  In this regard, according to the configuration of (1) above, the lubricating oil is discharged from the bearing internal space to the outside even if the gap between the inner peripheral surface of the side plate and the outer peripheral surface of the rotor shaft is narrowed. The situation where the bearing interior space is filled with lubricating oil can be avoided, and the increase in the stirring resistance of the rotor shaft can be suppressed.

(2) In some embodiments, in the configuration of (1) above,
The at least one oil supply unit includes an oil supply unit installed at a circumferential position between the at least two bearing pads.
According to the configuration of (2) above, the lubricating oil is supplied from the oil supply unit between the rotor shaft and the downstream bearing pad, the lubricating oil used in the upstream bearing pad, the lubricating oil supplied from the oil supply unit, Will be replaced. Accordingly, the rotor shaft can be lubricated with the lubricating oil newly supplied from the oil supply unit at the downstream bearing pad.

(3) In some embodiments, in the above configuration (1) or (2),
One or more of the openings are provided in a lower half region of the side plate.
According to the configuration of (3) above, excess lubricating oil is discharged from the lower half area of the side plate. Thereby, the increase in the stirring loss of the rotor shaft can be suppressed.

(4) In some embodiments, in any one of the above configurations (1) to (3),
One or more of the openings are provided in a lower half region of the carrier ring.
According to the configuration of (4) above, excess lubricating oil is discharged from the lower half region of the carrier ring. Thereby, the increase in the stirring loss of the rotor shaft can be suppressed.

(5) In some embodiments, in any one of the above configurations (1) to (4),
The at least two bearing pads are:
A first bearing pad provided on the inner peripheral side of the lower half region of the carrier ring;
A second bearing pad provided on the inner peripheral side of the lower half region of the carrier ring on the downstream side in the rotational direction of the rotor shaft with respect to the first bearing pad and configured to support the rotor shaft from below; ,
Including
One or more of the openings are provided at a circumferential position between the first bearing pad and the second bearing pad.
According to the configuration of (5) above, surplus lubricating oil is discharged from the circumferential position between the first bearing pad and the first bearing pad. As a result, a situation in which the lubricating oil is filled between the first bearing pad and the second bearing pad is avoided, and an increase in the stirring loss of the rotor shaft can be suppressed.

(6) In some embodiments, in the configuration of (5) above,
The at least one refueling unit is
A first oil supply unit located immediately upstream of the first bearing pad;
A second oil supply unit installed at a circumferential position between the first bearing pad and the second bearing pad;
including.
According to the configuration of (6) above, the lubricating oil is supplied from the first oil supply unit to the first bearing pad, and the lubricating oil is supplied from the second oil supply unit to the second bearing pad. As a result, the lubricating oil used in the first bearing pad and the lubricating oil supplied from the second oil supply unit are exchanged, and the rotor shaft is rotated by the lubricating oil newly supplied from the second oil supply unit in the second bearing pad. Can be lubricated.

(7) In some embodiments, in the configuration of (5) or (6) above,
Provided on the inner peripheral side of the upper half region of the carrier ring, further comprising a guide metal covering the upper region of the outer peripheral surface of the rotor shaft;
The at least one opening is a circumferential position between the guide metal and the first bearing pad, in addition to the circumferential position between the first bearing pad and the second bearing pad, or It is provided in at least one of the circumferential positions between the guide metal and the second bearing pad.
According to the configuration of (7) above, excess lubricating oil is discharged from the circumferential position between the guide metal and the first bearing pad or from the circumferential position between the guide metal and the second bearing pad. . As a result, a situation in which the lubricating oil is filled between the guide metal and the first bearing pad or between the guide metal and the second bearing pad is avoided, and an increase in the stirring loss of the rotor shaft can be suppressed.

(8) In some embodiments, in any one of the above configurations (5) to (7),
A third oil supply unit is further provided on the downstream side of the second bearing pad.
According to the configuration of (8), since the lubricating oil is supplied from the third oil supply unit to the rotor shaft, the lubricating oil carried over (supplied) to the first bearing pad increases.

(9) In some embodiments, in any one of the above configurations (1) to (8), the upper portion of the outer peripheral surface of the rotor shaft is provided on the inner peripheral side of the upper half region of the carrier ring. A guide metal covering the
The at least one opening is provided in a circumferential position range excluding the extending range of the guide metal.
According to the configuration of (9), it is difficult for the lubricating oil to leak from the extending range of the guide metal, and the carry over of the lubricating oil can be effectively promoted despite the head difference.

(10) A rotating machine according to at least one embodiment of the present invention includes:
A rotor shaft is supported on the journal bearing according to any one of claims 1 to 9.
According to the configuration of (10) above, a situation in which the lubricating oil fills the bearing internal space is avoided, and an increase in the stirring resistance of the rotor shaft can be suppressed.

  According to at least one embodiment of the present invention, a situation in which the bearing oil is filled with lubricating oil is avoided, and an increase in the stirring resistance of the rotor shaft can be suppressed.

It is a figure which shows the cross section of the journal bearing which concerns on one Embodiment of this invention schematically, Comprising: It is a figure which shows the state supported by the housing. It is sectional drawing which follows the II-II line of the journal bearing supported by the housing shown in FIG. It is sectional drawing which follows the III-III line of the journal bearing 1 supported by the housing shown in FIG. It is a figure which shows schematically the nozzle which comprises a 1st oil supply unit. It is a figure showing roughly the journal bearing concerning one embodiment. It is a figure showing roughly the journal bearing concerning one embodiment. It is a figure showing roughly the journal bearing concerning one embodiment. It is a figure showing roughly the journal bearing concerning one embodiment.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Absent.
For example, expressions expressing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly In addition to such an arrangement, it is also possible to represent a state of relative displacement with an angle or a distance such that tolerance or the same function can be obtained.
In addition, for example, expressions representing shapes such as quadrangular shapes and cylindrical shapes not only represent shapes such as quadrangular shapes and cylindrical shapes in a strict geometric sense, but also within the range where the same effect can be obtained. A shape including a chamfered portion or the like is also expressed.
On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of the other constituent elements.

FIG. 1 is a view schematically showing a cross section of a journal bearing 1 according to an embodiment of the present invention, and is a view showing a state supported by a housing H. FIG. 2 is a cross-sectional view taken along line II-II of the journal bearing 1 supported by the housing H shown in FIG. 1, and FIG. 3 is a cross-sectional view of the journal bearing 1 supported by the housing H shown in FIG. It is sectional drawing which follows the -III line. 5 to 7 are diagrams schematically showing the journal bearing 1 according to some embodiments.
FIG. 1 is a cross-sectional view taken along line II of the journal bearing 1 supported by the housing H shown in FIG.

  In some embodiments, as shown in FIG. 1 to FIG. 3, the journal bearing 1 is a mechanical element for rotatably supporting the rotor shaft 11, and is supported by a housing H, and includes a steam turbine, a gas turbine, It is attached to a rotating machine such as a blower or a compressor. As shown in FIGS. 2 and 3, the housing H has a pedestal part H1 constituting the lower half part and a cover H2 constituting the upper half part, and the housing H is provided between the pedestal part H1 and the cover H2. In a state where the journal bearing 1 according to the embodiment is sandwiched, the cover H2 is fastened to the pedestal portion H1 with a bolt H3. Thereby, the journal bearing 1 is supported by the housing H, and the rotor shaft 11 rotatably supported by the journal bearing 1 is also rotatably supported by the housing H.

  In some embodiments, as shown in FIGS. 1-3, the journal bearing 1 comprises a carrier ring 2, at least two bearing pads (31, 32), at least one oiling unit (4, 5, 6), And a pair of side plates 7,7.

  As shown in FIGS. 1 and 2, the carrier ring 2 is disposed inside the housing H and has a cylindrical space and can surround a part of the rotor shaft 11, that is, the journal 12. The carrier ring 2 has, for example, a cylindrical shape with a rectangular cross section.

As shown in FIG. 2, in some embodiments, the journal bearing comprises at least two bearing pads (31, 32) for supporting the rotor shaft 11 from below.
These at least two bearing pads (31, 32) are provided on the inner peripheral side of the lower half region of the carrier ring 2, and can respectively support the rotor shaft 11 from below.

  The first bearing pad 31 is provided on the inner peripheral side of the lower half region of the carrier ring 2 and is configured to support the rotor shaft 11 from below. The first bearing pad 31 has a sector shape when viewed along the axial direction of the carrier ring 2, and has a curved inner peripheral surface 31 a and outer peripheral surface 31 b. The inner peripheral surface 31 a of the first bearing pad 31 is formed of a bearing alloy, for example, white metal, and is disposed to face a part of the rotor shaft 11, that is, the outer peripheral surface 12 a of the journal 12.

  In some embodiments, a tilting unit (not shown) is provided between the first bearing pad 31 and the carrier ring 2, and the first bearing pad 31 is supported to be tiltable.

  The second bearing pad 32 is provided on the inner peripheral side of the lower half region of the carrier ring 2 on the downstream side in the rotation direction of the rotor shaft 11 with respect to the first bearing pad 31, and similarly to the first bearing pad 31, the rotor shaft 11. Is supported from below. Similar to the first bearing pad 31, the second bearing pad 32 has a sector shape when viewed along the axial direction of the carrier ring 2, and has a curved inner peripheral surface 32a and outer peripheral surface 32b. Yes. Similar to the first bearing pad 31, the inner peripheral surface 32 a of the second bearing pad 32 is formed of a bearing alloy, for example, white metal, and is disposed to face the outer peripheral surface 12 a of the journal 12.

  In some embodiments, a tilting unit (not shown) is provided between the second bearing pad 32 and the carrier ring 2, as in the case between the second bearing pad 32 and the carrier ring 2. The two bearing pads 32 are supported to be tiltable.

In some embodiments, a guide metal 33 is further provided.
The guide metal 33 is provided on the inner peripheral side of the upper half region of the carrier ring 2 and is fixed to the carrier ring 2 by bolts (not shown). The guide metal 33 has a fan shape when viewed along the axial direction of the carrier ring 2 and covers the upper region of the outer peripheral surface of the rotor shaft 11. The guide metal 33 has a bearing surface 33 a on the inner side in the radial direction of the carrier ring 2. The bearing surface 33a is curved along the upper region of the outer peripheral surface 12a of the journal 12, and is opposed to the upper region of the outer peripheral surface 12a of the journal 12 with a bearing gap.

As shown in FIG. 2, in some embodiments, the journal bearing 1 includes at least one oil supply unit (4, 5, 6) for supplying lubricating oil toward the rotor shaft 11.
These at least one oil supply unit (4, 5, 6) is arranged to be separated from each other in the circumferential direction, and can supply lubricating oil toward the rotor shaft 11. For example, a manifold 24 is formed in the carrier ring 2, and lubricating oil is supplied to the plurality of oil supply units (4, 5, 6) through the manifold 24.

  The first oil supply unit 4 is for supplying lubricating oil toward a part of the rotor shaft 11, that is, the journal 12, and is provided on the upstream side of the first bearing pad 31 in the rotational direction of the rotor shaft 11. It is arranged immediately before 31. The first oil supply unit 4 includes a plurality of nozzles 41, 42, for example, two nozzles 41, 42. The plurality of nozzles 41 and 42 of the first oil supply unit 4 are fixed with an interval immediately before the upstream side of the first bearing pad 31.

FIG. 4 is a diagram schematically showing the nozzles 41 and 42 constituting the first oil supply unit 4.
As shown in FIG. 4, the nozzles 41 and 42 of the first oil supply unit 4 each have a base portion 43 and a branch portion 44. The base 43 has a cylindrical shape with a closed end, is disposed along the radial direction of the carrier ring 2, and is fixed to the carrier ring 2 so as to communicate with the manifold 24. The branch portion 44 has a cylindrical shape whose tip is narrower than the base portion 43, is arranged along the axial direction of the carrier ring 2, and is provided on both sides of the base portion 43 so as to communicate with the internal space of the base portion 43. It is fixed. Further, the branch portion 44 is provided with a plurality of oil discharge holes 45 so as to face the axis of the carrier ring 2.

  As shown in FIG. 2, the second oil supply unit 5 is for supplying lubricating oil toward a part of the rotor shaft 11, that is, the journal 12, like the first oil supply unit 4. It is arranged at a circumferential position between 31 and the second bearing pad 32. Similar to the first oil supply unit 4, the first oil supply unit 4 includes a plurality of nozzles 51, 52, for example, two nozzles 51, 52. The plurality of nozzles 51 and 52 of the second oil supply unit 5 are arranged at intervals in the circumferential position between the first bearing pad 31 and the second bearing pad 32. Since the nozzles 51 and 52 have the same configuration as the nozzles 41 and 42 constituting the first oil supply unit 4, here, the corresponding base 53, branch 54 and oil discharge hole 55 are denoted by the reference numerals in FIG. A description thereof will be omitted.

  According to this configuration, the lubricating oil is supplied from the second oil supply unit 5 between the rotor shaft 11 and the second bearing pad 32, and the lubricating oil used in the first bearing pad 31 is supplied from the second oil supply unit 5. The used lubricating oil is replaced. Thereby, the second bearing pad 32 can lubricate the rotor shaft 11 with the lubricating oil newly supplied from the second oil supply unit 5.

In some embodiments, a third oil supply unit 6 is provided.
Similar to the first oil supply unit 4 and the second oil supply unit 5, the third oil supply unit 6 is for supplying lubricating oil toward the rotor shaft 11, that is, the journal 12, and the rotor shaft of the second bearing pad 32. 11 is disposed immediately downstream of the second bearing pad 32 on the downstream side in the rotational direction. The third oil supply unit 6 may include a plurality of nozzles, but in the exemplary embodiment shown in FIG. Since the nozzle 61 has the same configuration as the nozzle 41 constituting the first oil supply unit 4, the corresponding base 63, branch 64, and oil discharge hole 65 are described here with reference to FIG. 4. Is omitted.
According to this configuration, since the lubricating oil is supplied from the third oil supply unit 6 to the rotor shaft 11, the lubricating oil carried over (supplied) to the first bearing pad 31 increases.

  The pair of side plates 7, 7 are arranged along the outer periphery of the rotor shaft 11 at one end and the other end in the axial direction of the carrier ring 2, and both ends of the internal space of the journal bearing 1 in the axial direction of the carrier ring 2. It prescribes. The pair of side plates 7 and 7 are respectively fixed to the carrier ring 2 with bolts 71.

As shown in FIG. 1, in some embodiments, the lubricating oil supply method in the journal bearing 1 is a so-called direct lubrication method. That is, the journal bearing 1 includes a bearing inner space surrounded by a pair of side plates 7 and 7 between the inner peripheral surface of each side plate 7 and a part of the rotor shaft 11, that is, the outer peripheral surface 12 a of the journal 12. A gap for communicating with the outside is provided. For this reason, the internal space of the journal bearing 1 is not completely filled with the lubricating oil, and at least a part of the internal space of the journal bearing 1 is occupied by air entering from the outside. The pressure of the lubricating oil present inside the journal bearing 1 is equivalent to the atmospheric pressure.
In this respect, the above-described direct lubrication type journal bearing 1 is different from an oil bath lubrication type journal bearing in which the bearing internal space is filled with lubricating oil. In an oil bath lubrication type journal bearing, a sealing member is provided between the side plate and the outer peripheral surface of the journal to prevent leakage of the lubricating oil from the bearing inner space to the outside so that the bearing inner space is filled with the lubricating oil. It has become. For this reason, the lubricating oil present in the internal space of the oil bath lubrication type journal bearing is at a pressure higher than the atmospheric pressure.

Here, in the journal bearing 1 of the direct lubrication system, there is a tendency that the oil film thickness in the bearing pad (first bearing pad 31) located on the upstream side in the rotation direction of the rotor shaft 11 is insufficient. This is considered to be caused by a shortage of lubricating oil carried over to the first bearing pad 31.
That is, in the journal bearing 1 of the direct lubrication method, the lubricating oil is not easily carried over due to the head difference, and in addition, a pair of gaps are formed between the inner peripheral surface of each side plate 7, 7 and the outer peripheral surface of the rotor shaft 11. Lubricating oil easily leaks in the second region located above the first region, having a gap for communicating the bearing inner space surrounded by the side plates 7 and 7 with the outside. For this reason, the lubricating oil carried over to the first bearing pad is reduced, and the lubricating oil supplied to the first bearing pad 31 is insufficient. In particular, when the surface pressure of the rotor shaft 11 with respect to the first bearing pad 31 and the second bearing pad 32 is low, or when the rotor shaft 11 rotates in a low rotation region, the first bearing pad 31 carries over. Since there is little lubricating oil, the lubricating oil shortage in the 1st bearing pad 31 is remarkable. When the lubricating oil supplied to the first bearing pad 31 is insufficient, the first bearing pad 31 does not get wet from the inlet, so that the oil film pressure generation region is narrowed, and the oil film of the first bearing pad 31 becomes thin. Thereby, when the surface pressure of the rotor shaft 11 with respect to the first bearing pad 31 is low, or when the rotor shaft 11 rotates in a low rotation region, the axial center locus of the rotor shaft 11 deviates from the vertical line, and the journal bearing. The isotropy of 1 may be impaired. On the other hand, if the amount of lubricating oil carried over to the first bearing pad 31 becomes excessive, the stirring resistance of the rotor shaft 11 may increase.

  Therefore, in some embodiments, as shown in FIGS. 5 to 8, the bearing internal space (R 1, R 2) surrounded by at least two bearing pads (31, 32) and the pair of side plates 7, 7. At least one opening (72a, 72b, 73, 74, 75, 25, 26, 27) configured to discharge the lubricating oil to the outside from the bearing internal space (R1, R2). Have.

  In this case, even if the gap between the inner peripheral surface of the side plate 7 and the outer peripheral surface of the rotor shaft 11 is narrowed, the lubricating oil is opened from the bearing internal space (R1, R2) to the openings (72a, 72b, 73, 74, 75, 25, 26, 27) and discharged to the outside, a situation in which the bearing internal space (R1, R2) is filled with lubricating oil is avoided, and an increase in the stirring resistance of the rotor shaft 11 can be suppressed. Further, since the gap between the inner peripheral surface of the side plate 7 and the outer peripheral surface of the rotor shaft 11 can be narrowed, the lubricating oil is less likely to leak from between the rotor shaft 11 and the side plate 7, and the first bearing pad Sufficient lubricating oil is carried over (supplied) to 31. Thereby, even when the surface pressure of the rotor shaft 11 with respect to the first bearing pad 31 is low, or when the rotor shaft 11 rotates at a low rotation, the oil film thickness at the first bearing pad 31 can be sufficiently secured. On the other hand, since excess lubricating oil is discharged from between the rotor shaft 11 and the side plate 7 through the openings (72a, 72b, 73, 74, 75, 25, 26, 27), a situation where the lubricating oil is filled is avoided. Thus, an increase in the stirring resistance of the rotor shaft 11 can also be suppressed.

As shown in FIGS. 5 and 6, in some embodiments, one or more openings (72 a, 72 b, 73) are provided in the lower half region of the side plate 7.
According to this configuration, excess lubricating oil is discharged from the lower half area of the side plate 7. Thereby, the increase in the stirring loss of the rotor shaft 11 can be suppressed.

As shown in FIGS. 7 and 8, in some embodiments, one or more openings (25, 26, 27) are provided in the lower half region of the carrier ring 2.
According to this configuration, excess lubricating oil is discharged from the lower half region of the carrier ring 2. Thereby, the increase in the stirring loss of the rotor shaft 11 can be suppressed.

As shown in FIGS. 5-8, in some embodiments, one or more openings (72a, 72b, 73, 25) are circumferential between the first bearing pad 31 and the second bearing pad 32. Provided in position.
According to this configuration, excess lubricating oil is discharged from the circumferential position between the first bearing pad 31 and the second bearing pad 32. Thereby, the situation where the lubricating oil is filled between the first bearing pad 31 and the second bearing pad 32 is avoided, and an increase in the stirring loss of the rotor shaft 11 can be suppressed.

As shown in FIGS. 5, 6, and 8, in some embodiments, at least one opening (74, 75, 26) is a circumferential direction between the first bearing pad 31 and the second bearing pad 32. In addition to the position, it is provided at at least one of a circumferential position between the guide metal 33 and the first bearing pad 31 or a circumferential position between the guide metal 33 and the second bearing pad 32.
According to this configuration, excess lubricating oil is discharged from the circumferential position between the guide metal 33 and the first bearing pad 31 or from the circumferential position between the guide metal 33 and the second bearing pad 32. . As a result, a situation in which the lubricating oil is filled between the guide metal 33 and the first bearing pad 31 or between the guide metal 33 and the second bearing pad 32 is avoided, and the stirring loss of the rotor shaft 11 is increased. Can be suppressed.

As shown in FIGS. 5 to 8, in some embodiments, at least one opening (74, 26) is provided in a circumferential position range excluding the extending range of the guide metal 33.
According to this configuration, the lubricating oil is less likely to leak from the extending range of the guide metal 33, and the carryover of the lubricating oil can be effectively promoted despite the head difference.

  The present invention is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.

1 journal bearing 11 rotor shaft 12 journal 12a outer peripheral surface 2 carrier ring 24 manifold 25 opening 26 opening 27 opening 31 first bearing pad 31a inner peripheral surface 31b outer peripheral surface 32 second bearing pad 32a inner peripheral surface 32b outer peripheral surface 33 guide metal 33a Bearing surface 4 First oil supply unit 41, 42 Nozzle 43 Base 44 Branch 45 Oil discharge hole 5 Second oil supply unit 51, 52 Nozzle 53 Base 54 Branch 55 Oil discharge hole 6 Third oil supply unit 61 Nozzle 63 Base 64 Branch 65 Oil discharge hole 7 Side plate 71 Bolt 72a, 72b Opening 73 Opening 74 Opening 75 Opening R1, R2, Bearing inner space H Housing H1 Base part H2 Cover H3 Bolt

Claims (10)

A cylindrical carrier ring;
At least two bearing pads provided on the inner peripheral side of the carrier ring and configured to support the rotor shaft;
At least one oil supply unit that is provided on the inner peripheral side of the carrier ring and supplies lubricating oil between the bearing pad and the rotor shaft;
A pair of side plates installed along the outer periphery of the rotor shaft at one end and the other end in the axial direction of the carrier ring;
With
At least one opening configured to open the bearing inner space surrounded by the at least two bearing pads and the pair of side plates to the atmosphere and to discharge the lubricating oil from the bearing inner space to the outside. A journal bearing comprising:   The journal bearing according to claim 1, wherein the at least one oil supply unit includes an oil supply unit installed at a circumferential position between the at least two bearing pads.   The journal bearing according to claim 1, wherein the one or more openings are provided in a lower half region of the side plate.   The journal bearing according to any one of claims 1 to 3, wherein the one or more openings are provided in a lower half region of the carrier ring. The at least two bearing pads are:
A first bearing pad provided on the inner peripheral side of the lower half region of the carrier ring;
A second bearing pad provided on the inner peripheral side of the lower half region of the carrier ring on the downstream side in the rotational direction of the rotor shaft with respect to the first bearing pad and configured to support the rotor shaft from below; ,
Including
The journal bearing according to claim 1, wherein the one or more openings are provided at a circumferential position between the first bearing pad and the second bearing pad. The at least one refueling unit is
A first oil supply unit located immediately upstream of the first bearing pad;
A second oil supply unit installed at a circumferential position between the first bearing pad and the second bearing pad;
The journal bearing according to claim 5, comprising: Provided on the inner peripheral side of the upper half region of the carrier ring, further comprising a guide metal covering the upper region of the outer peripheral surface of the rotor shaft;
The at least one opening is a circumferential position between the guide metal and the first bearing pad, in addition to the circumferential position between the first bearing pad and the second bearing pad, or The journal bearing according to claim 5 or 6, wherein the journal bearing is provided at at least one of circumferential positions between a guide metal and the second bearing pad.   The journal bearing according to any one of claims 5 to 7, further comprising a third oil supply unit disposed on a downstream side of the second bearing pad. Provided on the inner peripheral side of the upper half region of the carrier ring, further comprising a guide metal covering the upper region of the outer peripheral surface of the rotor shaft;
The journal bearing according to any one of claims 1 to 8, wherein the at least one opening is provided in a circumferential position range excluding an extension range of the guide metal.   A rotating machine, wherein a rotor shaft is supported by the journal bearing according to any one of claims 1 to 9.

Images