JP2018155184A - Rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary machine capable of preventing stick between a stationary component and a movable component.SOLUTION: There is provided a movable side bearing stand 18 constituted in such a way that it may be followed to thermal elongation along a direction of axis line O of a passenger compartment 14 to move on a base part 32 in a direction of axis line O. The movable side bearing stand 18 is provided with a floating force generating space 20 for holding a floating force generating body 38 for applying a floating force directed upward along a vertical direction in respect to a lower part 34 of the movable side bearing stand 18, the floating force generating space 20 including a recess arranged at the lower part 34 of the movable side bearing stand in such a way that a closed space for holding the floating force generating body 38 between it and a base part 32, and a floating force generating body supply passage arranged at the lower part 34 of the movable side bearing stand to supply the floating force generating body 38 at the floating force generating space 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating machine, and more particularly to an improvement of the bearing stand structure thereof.

  Conventionally, various rotating machines have been used. For example, rotating machines that operate at high temperatures, such as steam turbines and gas turbines, are used to drive machines such as generators. These turbines include a rotor that is supported by a bearing stand so as to be rotatable about an axis in a vehicle compartment that forms an outer shell of the turbine. The rotor rotates in the vehicle interior when steam or combustion gas is supplied as a working fluid into the vehicle interior. The turbine rotates a generator or the like by the rotation of the rotor.

  By the way, in a rotary machine operated at a high temperature such as a steam turbine or a gas turbine, various thermal deformations occur due to heat generated in a vehicle compartment or a rotor bearing during operation of the turbine. For example, during operation of the steam turbine, the passenger compartment extends in the axial direction due to thermal deformation.

For this reason, the turbine in which the passenger compartment is thermally deformed is designed to move a movable part such as a bearing stand with respect to a fixed part such as a foundation following the extension in the axial direction of the passenger compartment.
For example, although the technology is designed to move the exhaust hood in the axial direction relative to the base plate during thermal expansion of the steam turbine, Patent Document 1 discloses that a low friction pad is assembled between the base plate and the exhaust hood. A technique for providing a sliding slide plate assembly to reduce the frictional force between the base plate and the exhaust hood is described.

JP 2006-138318 A

  However, even with the technique described in Patent Document 1, sticking (sticking) may occur between the fixed component and the movable component.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rotating machine that can prevent a stick between a fixed part and a movable part.

In order to solve the above problems, the present invention employs the following means.
That is, a rotating machine according to an aspect of the present invention includes a rotating body including a rotor that rotates about an axis, a casing that rotatably stores the rotating body, and a bearing that rotatably receives one end side of the rotor. A fixed-side bearing base that supports a fixed-side bearing base whose axial position is fixed on the base, and a movable-side bearing base that supports a bearing that rotatably receives the other end side of the rotor, A movable bearing base configured to move in the axial direction on the base following the axial thermal expansion of the passenger compartment. The movable bearing base is at least one levitation force generating space for holding a levitation force generator that applies a vertical upward levitation force to the lower portion of the movable bearing base, and is between the base and Provided in at least one levitation force generation space including a notch provided in a lower portion of the movable side bearing base and a lower portion of the movable side bearing base so as to form a closed space for holding the levitation force generator. And at least one levitation force generator supply path for supplying the levitation force generator to the levitation force generation space.

  According to this configuration, since the levitation force generation space is provided in the lower part of the movable side bearing base, a vertical upward levitation force acts on the movable side bearing base. Thereby, even if the thermal expansion in the axial direction of the passenger compartment occurs, the movable bearing base can be smoothly moved in the axial direction.

  In the rotating machine, the levitation force generation space may be provided directly below the movable-side bearing base.

  According to this configuration, since the levitation force generation space is provided directly below the movable bearing base, a vertical upward levitation force can be efficiently applied to the movable bearing base. Thereby, a movable side bearing stand can be moved more smoothly.

In the above rotating machine, the area of the levitation force generation space with respect to the entire area of the lower part of the movable bearing base may be 20% or more.
The “lower part of the movable-side bearing base” herein refers to a surface facing the base of the movable-side bearing base. For example, when a bottom plate is provided at the lower part of the movable-side bearing base, the “bottom plate” is meant. In the case where the bottom plate is provided at the lower part of the movable side bearing base, the “total area of the lower part of the movable side bearing base” refers to the entire area of the bottom plate. The “total area” here refers to the area of the entire lower surface of the bottom plate including the range corresponding to the levitation force generation space. The range corresponding to the levitation force generation space here refers to the range of the horizontal direction surface among the surfaces that define the levitation force generation space.

  According to this configuration, since the area of the levitation force generation space with respect to the entire area of the lower part of the movable side bearing base is set to 20% or more, the upward floating force can be efficiently applied to the movable side bearing base. Thereby, a movable side bearing stand can be moved more smoothly.

  The rotating machine may include a support portion provided in a levitation force generation space of the movable side bearing stand, and supporting a lower portion of the movable side bearing stand on the base portion.

  According to this configuration, the entire range of the levitation force generation space is not cut out, that is, the center of the levitation force generation space is not cut out, and the support portion is provided. Suppress. As a result, the movable bearing base can be moved smoothly.

  The rotating machine is a movable claw footrest that supports a clawfoot portion that protrudes from the passenger compartment, and includes a movable clawfoot platform that is configured to move in the axial direction on the base together with the movable bearing base. In addition, the levitation force generation space and the levitation force generator supply path may be further provided at a lower portion of the movable claw footrest.

  According to this configuration, since the levitation force generation space is also provided at the lower part of the movable side claw footrest, the upward levitation force acts on the movable side clawfoot platform. Thereby, even if the thermal expansion in the axial direction of the passenger compartment occurs, the movable bearing base and the movable claw foot can be smoothly moved in the axial direction.

  In the above rotating machine, the levitation force generation space may be provided immediately below the movable side claw footrest.

  According to this configuration, since the levitation force generation space is also provided immediately below the movable side claw footrest, a vertically upward levitation force can be efficiently applied to the movable side bearing stand and the movable side clawfoot base. For this reason, even if the passenger compartment extends in the axial direction, the movable bearing base and the movable claw footrest can be moved more smoothly.

In the rotating machine described above, the area of the levitation force generating space relative to the entire area of the lower part of the movable side claw footrest may be 20% or more.
The “lower part of the movable claw footrest” here refers to a surface facing the base of the movable claw footrest. For example, when a bottom plate is provided at the lower portion of the movable claw footrest, it means “bottom plate”. When the bottom plate is provided at the lower part of the movable side bearing stand, “the total area of the lower part of the movable side claw foot stand” means the entire area of the bottom plate. The “total area” here refers to the area of the entire lower surface of the bottom plate including the range corresponding to the levitation force generation space. The range corresponding to the levitation force generation space here refers to the range of the horizontal direction surface among the surfaces that define the levitation force generation space.

  According to this configuration, since the area of the levitation force generation space with respect to the entire area of the lower part of the movable side claw footrest is also 20% or more, the levitation force in the vertical direction can be efficiently applied to the movable side claw footrest. . Thereby, a movable side bearing stand and a movable side claw footrest can be moved more smoothly.

  The above rotating machine may include a support portion provided in a floating force generation space of the movable side claw footrest, and supporting a lower portion of the movable side claw footrest on the base portion.

  According to this configuration, the entire range of the levitation force generation space is not cut out, that is, the center of the levitation force generation space is not cut out, and the support portion is provided. Suppress. As a result, the movable side claw footrest can be moved smoothly.

In the above rotary machine, the levitation force generator may be grease, the levitation force generation space may be a grease holding space, and the levitation force generator supply path may be a grease supply path.
The grease here refers to a grease having a pressure capable of generating a levitation force that can move smoothly in the axial direction without sticking the movable side bearing portion and the movable side claw footrest.

  According to this configuration, a vertical upward lifting force can be applied to the movable bearing base and / or the movable claw foot platform with a simple configuration called grease. Thereby, a movable side bearing stand and / or a movable side claw footrest can be smoothly moved by simple structure.

The rotating machine may further include a grease supply source that is connected to the grease supply path and applies pressure to the grease.
Applying pressure to the grease here means that the grease has a pressure that can generate a levitating force that can move smoothly in the axial direction without sticking the movable bearing part and the movable claw footrest. To apply pressure to

  According to this structure, the grease of the pressure which can generate the floating force of this invention is obtained with the grease supply source. For this reason, the levitating force by grease can be generated efficiently. Thereby, a movable side bearing stand and / or a movable side claw footrest can be moved more smoothly.

  The rotating machine may further include a grease collection line that collects the grease overflowing from the grease holding space.

  According to this configuration, the grease overflowing from the grease holding space is recovered by the grease recovery line. For this reason, since grease can be used efficiently, it is possible to efficiently move the bearing base and / or the claw foot base with grease.

The present invention has been made paying attention to the following points.
For example, a steam turbine for power generation may undergo thermal deformation during operation, and the passenger compartment may extend in the axial direction. The casing and the bearing stand are connected by a connecting member so that the bearing stand moves following the axial extension of the casing.
For this reason, when the passenger compartment extends in the axial direction starting from the fixed bearing base, the connecting member is designed to move the movable bearing base by pushing the movable bearing base as much as the passenger compartment extends.
As described above, in the conventional rotary machine, although the movable side bearing base is designed to be movable in the axial direction, the movable side bearing base may actually stick due to some factor.
The inventors have found that such a movable bearing stand stick is an event that can occur during normal operation rather than can occur under certain conditions.

  According to the rotating machine of the present invention, it is possible to prevent the stick of the movable-side bearing stand during operation with the above structure, particularly in a rotating machine that is likely to generate thermal elongation.

It is explanatory drawing which shows typically the whole structure of the rotary machine concerning one Embodiment of this invention. It is explanatory drawing which shows typically the whole structure of the rotary machine concerning one Embodiment of this invention. It is a schematic diagram for demonstrating the grease holding space characteristic in the rotary machine concerning one Embodiment of this invention. It is a figure for demonstrating the grease holding space characteristic in the rotary machine concerning one Embodiment of this invention. It is explanatory drawing of the grease holding space of the rotary machine concerning one Embodiment of this invention. It is explanatory drawing of a more suitable support part in the grease holding space concerning one Embodiment of this invention. It is explanatory drawing of the grease holding space of the rotary machine concerning one Embodiment of this invention.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
FIG. 1 schematically shows a schematic configuration of a rotating machine according to an embodiment of the present invention. Since FIG. 1 is a schematic diagram, illustration of a levitation force generator supply path, a claw foot portion that is a supported portion protruding outward from the passenger compartment end, and a claw foot platform that supports the claw foot portion is omitted. ing.
A steam turbine (rotary machine) 10 according to an embodiment of the present invention is an external combustion machine that extracts the energy of steam S as rotational power, and is used for a generator in a power plant.

  The steam turbine 10 includes a turbine main body (rotating body) 12, a casing 14, a fixed-side bearing base 16, and a movable-side bearing base 18. The movable bearing stand 18 is provided with a high-pressure grease holding space (levitation force generating space) 20.

The turbine body 12 includes a rotor 22 that extends along the axis O so as to pass through the passenger compartment 14 and rotates about the axis O, and a moving blade 24 provided on the rotor 22.
The rotor 22 is housed in the passenger compartment 14 at an intermediate portion where the rotor blades 24 are provided.
Both ends of the rotor 22 pass through end portions on both sides of the vehicle compartment 14 in the direction along the axis O, and project outside the vehicle compartment 14.
Both ends of the rotor 22 that protrude outward from the vehicle interior 14 are rotatably supported by bearing portions 26 and 28.

The casing 14 accommodates the middle part of the turbine body 12 in a rotatable manner.
The vehicle compartment 14 includes a stationary blade 30 held in the vehicle compartment 14.

  The fixed-side bearing base 16 supports a bearing 26 that rotatably supports one end side of the rotor 22. The fixed-side bearing base 16 is fixed at a position in the axis O direction on a base plate (base part) 32.

The movable bearing stand 18 supports a bearing 28 that rotatably supports the other end of the rotor 22.
The movable side bearing base 18 has a bottom plate (lower part of the movable side bearing base) 34 attached to the lower surface thereof. The bottom plate 34 is made of the same material as the vehicle compartment 14.
The movable bearing stand 18 is configured to move in the axis O direction on the base plate 32 following the thermal expansion in the axis O direction of the passenger compartment 14.
For this purpose, the present embodiment includes a centering beam 36 that is a connecting member that connects the vehicle compartment 14 and the movable bearing stand 18 in the direction of the axis O.

A characteristic feature of the present invention is that a levitation force generation space is provided.
For this reason, in the present embodiment, a high-pressure grease holding space 20 is formed in the bottom plate 34 immediately below the movable bearing base 18. The high pressure referred to here is a pressure that generates a levitation force that can move in the direction of the axis O without sticking the movable bearing base 18.
The high pressure grease holding space 20 is filled with high pressure grease (levitation force generator) 38. The high-pressure grease holding space 20 holds the high-pressure grease 38 firmly in a closed space formed by the high-pressure grease holding space 20 and the base plate 32. The bottom plate 34 is notched so that this closed space is formed by the bottom plate 34 and the base plate 32.
The high-pressure grease 38 causes a vertical upward (upward in FIG. 1) levitation force to act on the bottom plate 36 (lower part of the movable bearing base) 36 of the movable bearing base 18.
According to this configuration, the high-pressure grease holding space 20 reduces the resistance force acting on the movable bearing base 18, for example, the frictional force between the base plate 32 and the bottom plate 34, thereby preventing sticking of the movable bearing base 18. can do.
Hereinafter, this action will be described more specifically.
In the steam turbine 10, the casing 14 extends in the axis O direction due to thermal deformation during operation. The casing 14 and the movable-side bearing base 18 are connected by a centering beam 36 so that the movable bearing base 18 moves following the extension of the casing 14 in the direction of the axis O.
For this reason, when the passenger compartment 14 is thermally expanded in the direction of the axis O starting from the fixed side bearing base 16, the movable side bearing base 18 is pushed in the direction of the axis O via the centering beam 36.
Here, in a general steam turbine, the movable-side bearing base is designed to move smoothly, but in reality, the movable-side bearing base and the base plate stick for some reason, and the movable-side bearing base is smooth. It may cause an event that does not move.
On the other hand, in the present embodiment, the high pressure grease holding space 20 is provided on the lower surface of the bottom plate 34 of the movable side bearing base 18, and the upward force in the vertical direction is applied to the movable side bearing base 18 by the pressure of the grease. Resistance force acting on the bearing stand 18, for example, frictional force between the base plate 32 and the bottom plate 34 is reduced. For this reason, the movable-side bearing stand 18 moves smoothly together with the bottom plate 34 without the base plate 32 and the bottom plate 34 sticking. That is, in the present embodiment, the movable-side bearing stand 18 can be moved in the direction of the axis O by the amount corresponding to the heat extension of the vehicle compartment 14 during operation, so that the influence of the heat extension of the vehicle compartment 14 is sufficiently eliminated. be able to.

[Cat footrest]
In order to more reliably prevent the stick of the movable part, it is preferable to apply the high-pressure grease holding space of this embodiment also to the cat footrest that supports the vehicle compartment. For this reason, in the present embodiment, the high-pressure grease holding space is also applied to a cat foot platform as shown in FIG.

  Hereinafter, an application example of the high-pressure grease holding space to the cat footrest will be described with reference to FIG. Since FIG. 2 is a schematic diagram, the illustration of the levitation force generator supply path is omitted.

  The vehicle compartment 14 includes a lower half compartment 14a and an upper half compartment 14b. The lower half casing 14a and the upper half casing 14b constitute a casing 14 by being fastened together using fasteners (not shown) such as bolts and nuts.

At the end of the compartment 14, a claw foot portion that is a supported portion protruding outward from the end of the lower half compartment 14 a is formed at the end of the lower half compartment 14 a. The claw foot portion is formed in a cantilever shape extending in the direction of the axis O from the end of the lower half compartment 14a.
The claw legs are arranged at four locations, one on each side of the axis O at each end of the lower half compartment 14a. In the figure, the claw foot portion includes a fixed claw foot portion 40 and a movable claw foot portion 42.
The fixed side claw foot portion 40 is supported by a fixed side claw foot platform 44.
The movable claw foot portion 42 is supported by a movable claw foot platform 46.

  The movable side claw foot platform 46 is provided with a bottom plate (lower portion of the movable side claw foot platform) 34 on the lower surface thereof, and is configured to move only on the base plate 32 together with the movable side bearing platform 18 via the bottom plate 34 in the direction of the axis O. Has been.

In the present embodiment, high pressure grease holding similar to the high pressure grease holding space provided in the bottom plate 34 directly below the movable side bearing stand is provided on the bottom plate 34 (directly below the movable side footrest) 34 directly below the movable side claw foot platform 46. A space (levitation force generating space) 48 is formed.
The high pressure grease 38 is firmly held in a closed space defined by the base plate 32 and the high pressure grease holding space 48 of the bottom plate 34.
The high-pressure grease 38 applies a force (levitation force) in the vertical direction (upward in the drawing) to the bottom plate 34 directly below the movable side claw foot platform 46.

  Thus, in the present embodiment, the bottom plate 34 just below the movable side claw foot platform 46 is also provided with the high pressure grease holding space 48 similar to the high pressure grease holding space just below the movable side bearing stand. Due to the grease pressure in the high-pressure grease holding space 48, a vertical upward force is also applied to the movable side claw foot platform 46, thereby causing a resistance force acting on the movable side claw foot platform 46, for example, between the base plate 32 and the bottom plate 34. Thus, the stick of the movable claw footrest 46 is prevented.

[Formation place]
In addition, in order to move a movable side bearing stand and a movable side claw foot stand (bottom board 34) more smoothly, the formation place of the high voltage | pressure grease holding space which concerns on this embodiment is also very important.
Therefore, in the present embodiment, as shown in FIG. 3, the bottom plate 34 is provided with a high-pressure grease holding space 20 that holds the high-pressure grease 38 directly below the movable bearing base 18 that is a heavy object. In the bottom plate 34, a high-pressure grease holding space 48 that holds the high-pressure grease 38 is also provided immediately below the movable side footrest 46 that is a heavy object.

In this way, by forming the high-pressure grease holding space 20 for holding the high-pressure grease 38 directly under the movable-side bearing base 18, the upward force in the vertical direction by the high-pressure grease 38 is efficiently applied to the lower surface of the movable-side bearing base 18. Act on. Similarly, by forming the high-pressure grease holding space 48 for holding the high-pressure grease 38 directly below the movable side claw foot platform 46, the upward force in the vertical direction by the high pressure grease 38 is also efficiently applied to the lower surface of the movable side claw foot platform 46. Act on.
By providing the high-pressure grease holding space directly below the bearing stand and the cat footrest in this way, a floating force can be more efficiently applied to the movable bearing stand and the movable catfoot foot, which is a heavy object. The sticks of the movable bearing base and the movable claw footrest (bottom plate 34) can be more reliably prevented.

[Keyway]
In order to move the movable side bearing base and the movable side claw foot platform (bottom plate 34) more smoothly, it is also preferable to restrict the moving direction of the bottom plate 34 relative to the base plate 32 only in the direction of the axis O.
Therefore, in the present embodiment, as shown in FIG. 3, a keyway 50 is formed on the lower surface of the bottom plate 34 in the direction of the axis O (not shown). The base plate 32 is provided with a key 52 fitted in the key groove 50.
Thus, in the present embodiment, the bottom plate 34 is configured so as to move along the direction of the key groove 50 and the key 52, that is, only in the axial direction and not in the orthogonal direction with respect to the base plate 32. Therefore, the stick of the bottom plate 34 can be prevented more reliably.

[Lubrication]
In order to move the movable side bearing stand and the movable side claw foot stand (bottom plate 34) more smoothly, lubrication is also preferable in addition to the application of the levitation force.
Therefore, in the present embodiment, grease for lubrication may be supplied to the keyway 50 as shown in FIG.
Thereby, the space between the base plate 32 and the bottom plate 34 is lubricated, and the bottom plate 34 is more easily moved on the base plate 32.

[Formation area]
In order to move the movable side bearing base and the movable side claw foot platform (bottom plate 34) more smoothly, in this embodiment, as is apparent from the view of the base plate as shown in FIG. A high-pressure grease holding space 20 is provided in the bottom plate directly under the base, and a high-pressure grease holding space 48 is also provided in the bottom plate directly under the movable side claw foot stand.
Further, the area of the high-pressure grease retaining spaces 20 and 48 is also very important in order to move the movable bearing base and the movable claw foot platform (bottom plate 34) more smoothly.
Therefore, in this embodiment, the area (horizontal surface) of the high-pressure grease retaining space 20 directly below the movable bearing base and the high-pressure grease retaining space directly below the movable claw foot platform with respect to the entire area (horizontal surface) of the bottom surface of the bottom plate 34. The total of 48 areas (horizontal planes) is 20% or more.

  In the steam turbine having the above-described configuration, the area of the high-pressure grease holding spaces 20 and 48 is 20% or more with respect to the total area of the bottom plate 34. Therefore, the upward force in the vertical direction due to the grease pressure is applied to the movable bearing stand and the movable claw leg. It can be made to act more positively on the table.

[High pressure grease supply source]
In order to move the movable bearing base and the movable claw foot platform (bottom plate 34) more smoothly, it is also very important to supply the high-pressure grease more reliably to the high-pressure grease holding space.
Therefore, this embodiment further includes a high-pressure grease supply source 60 and a high-pressure grease supply groove (levitation force generator supply path) 62 as shown in FIG.
The high pressure grease supply source 60 is connected to the high pressure grease supply groove 62. The high-pressure grease supply source 60 applies pressure to the grease to form a high-pressure grease 38. The high-pressure grease 38 here is a grease having a pressure that generates a levitation force that can move smoothly in the direction of the axis O without sticking the bottom plate 34.
The high-pressure grease supply groove 62 is provided in a bottom plate (lower part of the movable-side bearing base) below the movable-side bearing base, and supplies the high-pressure grease 38 from the high-pressure grease supply source 60 to the high-pressure grease holding space 20. . The high-pressure grease supply groove 62 is also provided on the bottom plate (lower part of the movable side claw footrest) under the movable side claw footrest, and supplies the high pressure grease 38 from the high pressure grease supply source 60 to the high pressure grease holding space 48. doing.

  In the steam turbine having the above configuration, the high-pressure grease supply source 60 is provided outside, so that the high-pressure grease can be more reliably supplied to the high-pressure grease holding spaces 20 and 48. For this reason, the high-pressure grease can be more reliably held in the high-pressure grease holding spaces 20 and 48. As a result, the upward force in the vertical direction by the high-pressure grease 38 can be more reliably applied to the bottom plate 34, so that the bottom plate 34 can be moved more smoothly.

Thus, in the present embodiment, the high pressure grease supply groove 62 and the high pressure grease holding spaces 20 and 48 are provided in the bottom plate 34.
The high-pressure grease holding spaces 20 and 48 are larger in area than the high-pressure grease supply groove 62. That is, the channel width of the high-pressure grease holding spaces 20 and 48 is wider than the channel width of the high-pressure grease supply groove 62.
High pressure grease is supplied to the high pressure grease holding spaces 20 and 48 through the high pressure grease supply groove 62, and the supplied high pressure grease 38 is stored in the high pressure grease holding spaces 20 and 48. As a result, the high-pressure grease is held in the high-pressure grease holding spaces 20 and 48.
As a result, in this embodiment, the movable bearing base and the movable claw foot platform (bottom plate 34), which are heavy objects, can be levitated by the pressure of grease.
According to the present embodiment, the entire bottom plate 34 floats uniformly regardless of the weights of the movable side bearing stand and the movable side claw footrest. Can move more smoothly.

  Note that the levitation means that the base plate 32 and the bottom plate 45 are lifted so that the base plate 32 and the base plate 45 are in contact with each other, rather than the movable bearing stand and the movable claw foot stand (bottom plate 34) being actually lifted. In other words, the bottom plate 34 does not stick on the base plate 32, and the floating force acts on the bottom plate 34 to the extent that it moves smoothly.

  The high-pressure grease 38 according to the present embodiment is a grease having a pressure that generates a levitation force that can move smoothly in the direction of the axis O without the bottom plate 34 sticking. An example of the pressure of the high-pressure grease 38 is up to 100 ata, but the area of the horizontal surface of the high-pressure grease holding space 20 (high-pressure grease holding space 48) is defined as the movable bearing base 18 (movable side claw foot platform 46). ) Reduce the pressure of the high-pressure grease 38 to about 1/2 to 1/5 compared with the case of a narrow grease groove width for general lubrication under the same conditions as the total area of the horizontal surface directly below. be able to. As described above, in the present embodiment, the pressure of the high-pressure grease 38 can be suppressed lower than that of a general grease groove width for general lubrication due to the wide groove width of the high-pressure grease holding space. With the configuration, the movable side bearing base and the movable side claw footrest (bottom plate 34) can be moved smoothly.

[Grease recovery line]
In this embodiment, since the grease becomes high pressure, there is a possibility that the grease leaks from the high pressure grease holding spaces 20 and 48. For this reason, it is very important to collect the grease overflowing from the high-pressure grease holding spaces 20 and 48.
Therefore, in the present embodiment, as shown in FIG. 4, a grease recovery line 64 is provided along the outer periphery of the high-pressure grease holding spaces 20 and 48.

  Since the steam turbine having the above-described configuration includes the grease recovery line 64, the grease overflowing from the high-pressure grease holding spaces 20 and 48 is recovered by the grease recovery line 64 during operation. For this reason, during operation, it is possible to efficiently move the movable bearing base and the movable claw foot platform (bottom plate 34) with high-pressure grease by efficiently using grease.

[Low pressure grease supply source]
As described above, in order to move the movable bearing base and the movable claw foot platform (bottom plate 34) more smoothly, lubrication is also important in addition to the application of the levitation force.
Therefore, in the present embodiment, a low-pressure grease supply source 70 and a low-pressure grease supply groove 72 are provided to supply grease for lubrication to the key groove 50. In the present embodiment, the low pressure grease from the low pressure grease supply source 70 is supplied to the key groove 50 of the bottom plate 34 via the low pressure grease supply groove 72.

  Thereby, in this embodiment, since it can lubricate reliably between the baseplate 32 and the baseplate 34, it is comprised so that a movable side bearing stand and a movable side claw footrest (bottom plate 34) may move more smoothly. . The low-pressure grease supply source 70 supplies grease for lubrication to such an extent that the key groove is filled, and does not positively apply a high pressure unlike the high-pressure grease for generating levitation force.

[Support]
In order to move the movable side bearing base and the movable side claw footrest (bottom plate 34) more smoothly, it is also preferable to provide a support portion in the high pressure grease holding space.
Therefore, as shown in FIG. 4, in this embodiment, the support portion 80 is provided in the high-pressure grease holding space 20, and the support portion 82 is provided in the high-pressure grease holding space 48.

Hereinafter, the support unit according to the present embodiment will be described more specifically with reference to FIGS. In the following description, the support portion 80 of the movable side bearing stand is described as an example, but the support portion 82 of the movable side claw foot stand is the same.
As shown in FIG. 5, when the groove width (opening width) a of the high-pressure grease holding space 20 exceeds 2500 mm, the deflection of the bottom plate 34 due to its own weight may be excessive.
Therefore, when the groove width a of the high-pressure grease holding space 20 exceeds 2500 mm, the support portion 80 as shown in FIG.

  According to the configuration of FIG. 6, even when the groove width a of the high-pressure grease holding space 20 exceeds 2500 mm, it is possible to prevent deflection due to its own weight. Thereby, the stick of the bottom plate 34 with respect to the base plate 32 can be prevented, and the bottom plate 34 can be smoothly moved with respect to the base plate 32.

  When the groove width a of the high-pressure grease holding space 20 is less than 2500 mm, the entire range of the groove width a of the high-pressure grease holding space 20 as shown in FIG. 7 even if there is a support portion 80 as shown in FIG. May be cut off.

  Thus, when the groove width of the high pressure grease supply space is large, it is considered that the deflection due to its own weight increases. Therefore, in this embodiment, in order to reduce the deflection of the bottom plate 34 due to the provision of the high-pressure grease holding space 20, the support portion 80 is provided without being cut out at the center of the high-pressure grease supply space 20. The same applies to the movable claw footrest.

Therefore, according to the steam turbine of the embodiment, sticking of the movable side bearing base and the movable side claw foot base (bottom plate 34) during operation can be prevented by the above structure.
Furthermore, according to the steam turbine of the embodiment, by supplying high-pressure grease during assembly, the movable-side bearing base and the movable-side claw foot base (bottom plate 34) can be easily moved to improve the assemblability of the steam turbine. be able to.

[Modification]
The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like within a scope not departing from the gist of the present invention. .

(Rotating machine)
For example, in the above-described embodiment, an example in which a steam turbine is used as the rotating machine has been described. However, the present invention is not limited to this, and may be, for example, another rotating machine.

(Levitation force)
In the above embodiment, it is particularly preferable to use high-pressure grease as the levitation force generator. However, it is possible to prevent the stick of the movable-side bearing base and the movable-side claw foot base (bottom plate) with respect to the base plate (base portion). Other levitation force generators can be used as long as levitation force can be obtained.

(Supply channel)
In the above embodiment, the example in which the supply groove is used as the high-pressure grease supply path has been described. However, the present invention is not limited to the supply groove, and a supply pipe can also be used.

(Bottom plate)
In the above-described embodiment, the example in which the movable side bearing base and the movable side claw footrest are provided on one bottom plate has been described. However, the present invention is not limited to this, and the movable side bearing base and the movable side clawfoot base are provided. Can be provided on different bottom plates.
When the movable side bearing base and the movable side claw footrest are provided on different bottom plates, the area of the high-pressure grease holding space with respect to the total area of the bottom plate for the movable side bearing base is set to 20% or more, and the movable side It is preferable that the area of the high-pressure grease holding space with respect to the total area of the bottom plate for the shaft leg is 20% or more.

10 Steam turbine (rotary machine)
12 Turbine body (rotating body)
14 Casing 16 Fixed bearing stand 18 Movable bearing stand 20, 48 High pressure grease holding space (levitation force generating space)
32 Base plate (base)
34 Bottom plate (lower part of movable bearing stand, lower part of movable claw footrest)
38 High pressure grease (grease, levitation force generator)
46 Movable side cat footrest 62 High pressure grease supply groove (levitation force generator supply path)

Claims (11)

A rotating body including a rotor that rotates about an axis;
A casing for rotatably storing the rotating body;
A fixed-side bearing base that supports a bearing that rotatably receives one end side of the rotor, the fixed-side bearing base having an axial position fixed on the base;
A movable-side bearing base that supports a bearing that rotatably receives the other end side of the rotor, and is configured to move in the axial direction on the base following the axial thermal expansion of the casing. A movable bearing stand;
With
In the movable side bearing stand,
It is at least one levitation force generation space for holding a levitation force generator that applies a vertical upward levitation force to the lower portion of the movable bearing base, and holds the levitation force generator between the base portion. At least one levitation force generation space including a notch provided in a lower portion of the movable bearing base so that a closed space is formed;
At least one levitation force generator supply path that is provided at a lower portion of the movable bearing base and supplies the levitation force generator to the levitation force generation space;
Rotating machine provided with.   The rotating machine according to claim 1, wherein the levitation force generation space is provided directly below the movable bearing base.   The rotating machine according to claim 2, wherein the area of the levitation force generation space with respect to the entire area of the lower part of the movable bearing base is 20% or more.   The support part provided in the floating force generation space of the said movable side bearing stand, Comprising: The support part which supports the lower part of the said movable side bearing stand on the said base is given to any one of Claim 1 to 3 The rotating machine described. A movable claw footrest that supports a clawfoot portion protruding from the vehicle compartment, further comprising a movable clawfoot platform configured to move in the axial direction on the base together with the movable side bearing stand,
The rotating machine according to any one of claims 1 to 4, wherein the levitation force generation space and the levitation force generator supply path are further provided in a lower portion of the movable claw foot platform.   The rotating machine according to claim 5, wherein the levitation force generation space is provided immediately below the movable side claw footrest.   The rotating machine according to claim 6, wherein an area of the levitation force generation space with respect to the entire area of the lower part of the movable side claw footrest is 20% or more.   The support part provided in the floating force generation | occurrence | production space of the said movable side claw footrest, Comprising: The support part which supports the lower part of the said movable side claw footrest on the said base part is provided. The rotating machine described. The levitation force generator is grease;
The levitation force generation space is a grease holding space,
The rotary machine according to any one of claims 1 to 8, wherein the levitation force generator supply path is a grease supply path.   The rotary machine according to claim 9, further comprising a grease supply source connected to the grease supply path, which applies pressure to the grease.   The rotating machine according to claim 9 or 10, further comprising a grease collection line for collecting grease overflowing from the grease holding space.

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