JP2010190192A - Steam turbine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain the consistency of the imposition of a rotor and a bearing while effectively utilizing the space around the bearing. <P>SOLUTION: A steam turbine is provided with a casing 1 in which the rotor 5 is stored, a front side bearing 21 which supports a journal bearing 212 that supports the rotor in a rotatable manner and a thrust bearing 213 which receives the force applied in an extended direction of a shaft center R of the rotor and which forms an open area S on the downside of a cantilevered section 211a which is cantilevered in the extended direction of the shaft center of the rotor while storing an end section of the rotor, a connecting section 3 which connects the cylinder with the front side bearing, and a moving platform 4 which supports the front side bearing along the extended direction of the shaft center of the rotor in a movable manner. The front side bearing is provided with an extended section 214 which is installed in an extended manner beneath the cantilevered section and forms the open area between the cantilevered section, and the moving platform is provided with a guide section 41 which reaches the downside of the extended section and is installed opposite to a bottom surface of the front side bearing to guide the movement of the front side bearing. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a steam turbine, and more particularly to a steam turbine capable of maintaining the integrity of the assembly of a rotor and a bearing portion that rotatably supports the rotor.

  In the steam turbine, due to the thermal expansion of the casing and the rotor, there is a problem that the matching of the assembly between the rotor and the bearing portion that rotatably supports the rotor is impaired.

  Therefore, in the conventional steam turbine, the bearing portion is configured to be movable in the extending direction of the rotor shaft center, and the bearing portion moves and the rotor and the bearing portion are assembled together with the thermal expansion of the casing and the rotor. Is known to maintain the consistency of (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 5-133201

  Incidentally, a journal bearing and a thrust bearing are supported inside the bearing portion of the steam turbine, and a lubricating oil supply pipe for supplying lubricating oil to each bearing is disposed outside the bearing portion. In addition, an overhang portion that accommodates the end portion of the rotor is provided outside the bearing portion, and an open area is defined below the overhang portion. Then, by providing a lubricating oil supply pipe in the open area, the space around the bearing portion is effectively used to reduce the size of the steam turbine.

  However, in order to provide an open area on the lower side of the bearing portion, the overhanging portion has an eaves-like structure, so that the center of gravity of the bearing portion is shifted to the overhanging portion side. For this reason, when comprised so that a bearing part may be moved with the thermal expansion of a vehicle interior and a rotor like patent document 1, a bearing part will incline to the overhang | projection part side, and the assembly | attachment of a rotor and a bearing part The integrity of the image is impaired. As a result, the rotor may come into contact with the bearing, the temperature of the white metal applied to the bearing surface of the bearing that contacts the rotor will rise, and there is a risk that problems such as reduced durability of the bearing and deterioration of the lubricating oil may occur. is there.

  An object of the present invention is to solve the above-described problems, and to provide a steam turbine capable of maintaining the assembly consistency between the rotor and the bearing portion while effectively using the space around the bearing portion. To do.

  In order to achieve the above-described object, in the steam turbine of the present invention, a casing in which the rotor is accommodated, a journal bearing that rotatably supports the rotor, and a force acting in the extending direction of the axis of the rotor are received. A bearing portion that supports a thrust bearing and that defines an open area below an overhanging portion that protrudes in an extending direction of an axis of the rotor while accommodating an end portion of the rotor; A steam turbine comprising: a connecting portion that connects the bearing portion to the bearing portion; and a moving base that movably supports the bearing portion along an extending direction of an axis of the rotor. It has an extending part that extends below the projecting part and defines the open area with the projecting part, and the movable table reaches the lower side of the projecting part A guide portion provided opposite to the bottom surface of the bearing portion to guide the movement of the bearing portion; Characterized in that by comprising.

  According to this steam turbine, the extension portion and the guide portion have a center of gravity in the vicinity of the center in the moving direction of the bearing portion even if the extension portion and the guide portion have an extension portion that defines an open area. For this reason, when a bearing part moves with thermal expansion of a vehicle interior and a rotor, the situation where a bearing part inclines to the overhang | projection part side is prevented. As a result, the integrity of the assembly between the rotor and the bearing portion can be maintained, and the temperature rise of the white metal applied to the bearing can be suppressed to prevent the occurrence of problems such as a decrease in the durability of the bearing and the deterioration of the lubricating oil. Moreover, the extension portion defines an open area with the overhang portion. For this reason, since a lubricating oil supply pipe can be piped between the overhanging portion and the extending portion, the space around the bearing portion can be used effectively, and the steam turbine can be downsized.

  Further, in the steam turbine of the present invention, the bearing portion has a flange portion provided to extend sideways along its own moving direction, and the moving base is configured so that the flange is provided on the vehicle cabin side. It has a support part which fits into a part and guides the movement of the bearing part.

  According to this steam turbine, even when the flange portion and the support portion are fitted to each other, the bearing portion is moved along with the thermal expansion of the passenger compartment and the rotor even if the flange portion and the rotor define the open region. Prevents the bearing part from tilting toward the overhanging part. As a result, the integrity of the assembly between the rotor and the bearing portion can be maintained, and the temperature rise of the white metal applied to the bearing can be suppressed to prevent the occurrence of problems such as a decrease in the durability of the bearing and the deterioration of the lubricating oil. In addition, since an open area is defined under the overhanging portion, a lubricating oil supply pipe can be piped in the open area, so that the space around the bearing portion can be used effectively and the steam turbine can be downsized. .

  In the steam turbine of the present invention, the connection portion is a first connection member connected to the lower side of the rotor and at the center of the bearing portion, and a first connection member connected to both sides of the rotor. It has two connection members.

  According to this steam turbine, when the bearing portion moves with the thermal expansion of the passenger compartment and the rotor, the second connecting members respectively arranged on both sides of the rotor swing the bearing portion that deviates in the left-right direction of the shaft center. prevent. Further, when the bearing portion moves, the first connecting member and the second connecting member are arranged vertically, so that even if the bearing portion has an overhanging portion that defines an open area, the bearing portion is on the overhanging portion side. To prevent the situation from leaning on. As a result, the integrity of the assembly between the rotor and the bearing portion can be maintained, and the temperature rise of the white metal applied to the bearing can be suppressed to prevent the occurrence of problems such as a decrease in the durability of the bearing and the deterioration of the lubricating oil. In addition, since an open area is defined under the overhanging portion, a lubricating oil supply pipe can be piped in the open area, so that the space around the bearing portion can be used effectively and the steam turbine can be downsized. .

  In the steam turbine of the present invention, the bearing portion has a keyway or a key formed along an extending direction of an axis of the rotor on a bottom surface facing the moving table, and the moving The base has the key groove or a key or key groove that fits into the key, and a rotating member that rotates while supporting the key as the bearing moves is disposed in the key groove. It is characterized by.

  According to this steam turbine, when the bearing portion moves due to the thermal expansion of the passenger compartment and the rotor, the frictional resistance when the bearing portion moves is reduced by the keyway, the rotating member, and the key. Even if it has an overhanging portion, it prevents the bearing portion from tilting toward the overhanging portion. Further, when the bearing portion moves, the swinging of the bearing portion that deviates in the left-right direction of the shaft center is prevented by the keyway, the rotating member, and the key. As a result, the integrity of the assembly between the rotor and the bearing portion can be maintained, and the temperature rise of the white metal applied to the bearing can be suppressed to prevent the occurrence of problems such as a decrease in the durability of the bearing and the deterioration of the lubricating oil. In addition, since an open area is defined under the overhanging portion, a lubricating oil supply pipe can be piped in the open area, so that the space around the bearing portion can be used effectively and the steam turbine can be downsized. .

  In order to achieve the above-described object, in the steam turbine of the present invention, a casing in which the rotor is accommodated, a journal bearing that rotatably supports the rotor, and a force acting in the extending direction of the axis of the rotor are received. A bearing portion that supports a thrust bearing and that defines an open area below an overhanging portion that protrudes in an extending direction of an axis of the rotor while accommodating an end portion of the rotor; And a bearing that connects the bearing part so as to be movable along the extending direction of the axis of the rotor. It has a flange portion that extends laterally along the moving direction, and the moving table has a support portion that fits the flange portion on the vehicle compartment side and guides the movement of the bearing portion. It is characterized by having.

  According to this steam turbine, even when the flange portion and the support portion are fitted to each other, the bearing portion is moved along with the thermal expansion of the passenger compartment and the rotor even if the flange portion and the rotor define the open region. Prevents the bearing part from tilting toward the overhanging part. As a result, the integrity of the assembly between the rotor and the bearing portion can be maintained, and the temperature rise of the white metal applied to the bearing can be suppressed to prevent the occurrence of problems such as a decrease in the durability of the bearing and the deterioration of the lubricating oil. In addition, since an open area is defined under the overhanging portion, a lubricating oil supply pipe can be piped in the open area, so that the space around the bearing portion can be used effectively and the steam turbine can be downsized. .

  In order to achieve the above-described object, in the steam turbine of the present invention, a casing in which the rotor is accommodated, a journal bearing that rotatably supports the rotor, and a force acting in the extending direction of the axis of the rotor are received. A bearing portion that supports a thrust bearing and that defines an open area below an overhanging portion that protrudes in an extending direction of an axis of the rotor while accommodating an end portion of the rotor; A steam turbine comprising: a connecting portion that connects the bearing portion to the bearing portion; and a moving stage that supports the bearing portion so as to be movable along an extending direction of an axis of the rotor. A first connection member connected at the center of the bearing portion and a second connection member connected at both side portions of the rotor.

  According to this steam turbine, when the bearing portion moves with the thermal expansion of the passenger compartment and the rotor, the second connecting members respectively arranged on both sides of the rotor swing the bearing portion that deviates in the left-right direction of the shaft center. prevent. Further, when the bearing portion moves, the first connecting member and the second connecting member are arranged vertically, so that even if the bearing portion has an overhanging portion that defines an open area, the bearing portion is on the overhanging portion side. To prevent the situation from leaning on. As a result, the integrity of the assembly between the rotor and the bearing portion can be maintained, and the temperature rise of the white metal applied to the bearing can be suppressed to prevent the occurrence of problems such as a decrease in the durability of the bearing and the deterioration of the lubricating oil. In addition, since an open area is defined under the overhanging portion, a lubricating oil supply pipe can be piped in the open area, so that the space around the bearing portion can be used effectively and the steam turbine can be downsized. .

  In order to achieve the above-described object, in the steam turbine of the present invention, a casing in which the rotor is accommodated, a journal bearing that rotatably supports the rotor, and a force acting in the extending direction of the axis of the rotor are received. A bearing portion that supports a thrust bearing and that defines an open area below an overhanging portion that protrudes in an extending direction of an axis of the rotor while accommodating an end portion of the rotor; A steam turbine comprising: a connecting portion that connects the bearing portion to the bearing portion; and a moving stage that supports the bearing portion movably along the extending direction of the axis of the rotor. A key groove or a key formed along the extending direction of the axis of the rotor on the bottom surface facing the table, and the moving table is a key or key fitted into the key groove or the key. It has a groove, and the key groove has Wherein the rotating member that rotates while supporting the key along with the movement of the serial bearing portion is disposed.

  According to this steam turbine, when the bearing portion moves due to the thermal expansion of the passenger compartment and the rotor, the frictional resistance when the bearing portion moves is reduced by the keyway, the rotating member, and the key. Even if it has an overhanging portion, it prevents the bearing portion from tilting toward the overhanging portion. Further, when the bearing portion moves, the swinging of the bearing portion that deviates in the left-right direction of the shaft center is prevented by the keyway, the rotating member, and the key. As a result, the integrity of the assembly between the rotor and the bearing portion can be maintained, and the temperature rise of the white metal applied to the bearing can be suppressed to prevent the occurrence of problems such as a decrease in the durability of the bearing and the deterioration of the lubricating oil. In addition, since an open area is defined under the overhanging portion, a lubricating oil supply pipe can be piped in the open area, so that the space around the bearing portion can be used effectively and the steam turbine can be downsized. .

  According to the present invention, the thermal expansion of the vehicle compartment and the rotor is ensured while ensuring an open area where the lubricating oil supply pipe can be piped on the lower side of the bearing portion that accommodates the end portion of the rotor, and effectively utilizing the space around the bearing portion. Accordingly, it is possible to maintain the assembly consistency between the rotor and the bearing portion when the bearing portion moves.

FIG. 1 is a schematic side view of a steam turbine according to a first embodiment of the present invention. FIG. 2 is an enlarged schematic side view around the bearing portion of the steam turbine shown in FIG. FIG. 3 is a schematic view of the bearing portion of the steam turbine according to the second embodiment of the present invention viewed from the rear side. FIG. 4 is a schematic side view of the bearing portion shown in FIG. FIG. 5 is a schematic view of the bearing portion of the steam turbine according to the third embodiment of the present invention viewed from the rear side. FIG. 6 is a schematic plan view of the bearing portion shown in FIG. FIG. 7 is a schematic view of the bearing portion of the steam turbine according to the fourth embodiment of the present invention viewed from the rear side. FIG. 8 is a schematic side view of the bearing portion shown in FIG.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

[Embodiment 1]
As shown in FIG. 1, the steam turbine according to the first embodiment includes a casing 1, a bearing portion 2, a connection portion 3, and a moving table 4.

  The vehicle compartment 1 accommodates the rotor 5 and is fixed to the gantry 8 although not shown in the figure. A plurality of stationary blades 11 are fixed radially to the inner wall of the passenger compartment 1. The stationary blade 11 is provided in a plurality of stages in the extending direction of the axis R extending in the front-rear direction. On the other hand, a plurality of moving blades 51 are fixed radially around the rotor 5. The moving blades 51 are provided in a plurality of stages in the extending direction of the axis R. The stationary blades 11 and the moving blades 51 are alternately arranged in the extending direction of the axis R. A steam inlet 12 is formed on the front side of the passenger compartment 1, and a steam outlet 13 is formed on the rear side of the passenger compartment 1. The steam supplied from the steam inlet 12 to the interior of the passenger compartment 1 acts on the rotor blades 51 in the rear stage while passing between the stationary blades 11 in the front stage while being discharged from the steam outlet 13. To do. As a result, the rotor 5 rotates about the axis R.

  The bearing portion 2 includes a front bearing portion 21 that supports the front end side of the rotor 5 that extends from the front side of the casing 1, and a rear bearing that supports the rear end side of the rotor 5 that extends from the rear side of the casing 1. Part 22. The front bearing portion 21 constitutes a bearing portion according to the present invention and has a housing portion 211. Inside the accommodating portion 211, a journal bearing 212 that rotatably supports the rotor 5 and a thrust bearing 213 that receives a force acting in the extending direction of the axis R of the rotor 5 are supported. The accommodating part 211 is provided with an overhanging part 211 a that projects in the extending direction (front side) of the axis R of the rotor 5 while accommodating the front end part of the rotor 5. An open area S is defined on the lower side of the overhanging portion 211 a that is the outside of the front bearing portion 21. In the open area S, a plurality of lubricating oil supply pipes 6 for supplying lubricating oil to the bearings 212 and 213 are provided.

  The rear bearing portion 22 has a housing portion 221. The accommodating portion 221 supports a journal bearing 222 that rotatably supports the rotor 5 therein. The rear bearing portion 22 is fixed to the stationary base 8 via the fixed base 7.

  The connection part 3 connects the vehicle interior 1 and the front bearing part 21 to each other.

  The movable table 4 is fixed to the gantry 8. The movable table 4 is provided to face the bottom surface of the front bearing portion 21 and can move the front bearing portion 21 along the extending direction of the axis R of the rotor 5 while supporting the load of the front bearing portion 21. To support.

  In the steam turbine having the above configuration, when thermal expansion occurs in the casing 1 and the rotor 5 due to high-temperature steam, the front bearing portion 21 pushed frontward via the connection portion 3 has the axis R on the movable table 4. It moves along the extending direction. The lubricating oil supply pipe 6 is provided with a connecting pipe 6a that expands and contracts as the front bearing portion 21 moves, so that the supply of lubricating oil from the lubricating oil supply pipe 6 to the front bearing portion 21 is maintained. .

  In the steam turbine described above, as shown in FIGS. 1 and 2, the front bearing portion 21 extends to the front side below the overhang portion 211a and continues to the bottom surface of the front bearing portion 21 so as to extend to the overhang portion 211a. An extending portion 214 that defines an open area S is provided. Further, the movable table 4 has a guide portion 41 that extends to the lower side of the extending portion 214 and extends to the front side, and supports the front bearing portion 21 so as to face the bottom surface of the front bearing portion 21 including the extending portion 214. Is provided. The guide portion 41 guides the movement of the front bearing portion 21.

  In the steam turbine having such a configuration, the extended portion 214 that extends below the overhang portion 211a and the guide portion 41 that supports the front bearing portion 21 including the extended portion 214 are provided. Even if it has the overhanging portion 211 a that defines S, it has a center of gravity near the center of the front bearing portion 21 in the front-rear direction. For this reason, when the front side bearing part 21 moves with thermal expansion of the compartment 1 and the rotor 5, the situation where the front side bearing part 21 inclines to the overhang | projection part 211a side is prevented. As a result, the assembly consistency between the rotor 5 and the front bearing portion 21 can be maintained, the temperature rise of the white metal applied to the bearings 212 and 213 is suppressed, the durability of the bearings 212 and 213 is lowered, the lubricant is deteriorated, etc. It is possible to prevent the occurrence of defects.

  Moreover, the extension part 214 defines an open area S between the extension part 211a and the extension part 211a. For this reason, since the lubricating oil supply pipe 6 can be piped between the overhanging portion 211a and the extending portion 214, the space around the front bearing portion 21 can be used effectively, and the steam turbine can be downsized. .

  As described above, according to the steam turbine of the first embodiment, it is possible to maintain the assembly consistency between the rotor 5 and the front bearing portion 21 while effectively using the space around the front bearing portion 21. .

[Embodiment 2]
In the second embodiment described below, the same parts as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIGS. 3 and 4, the front bearing portion 21 is provided with a flange portion 215 extending sideways along the extending direction of the axis R which is the moving direction of the front bearing portion 21. In addition, the moving table 4 is provided with a support portion 42 that is fitted to the flange portion 215 and guides the movement of the front bearing portion 21 on the rear side that is the vehicle compartment 1 side.

  In the steam turbine having such a configuration, even when the flange portion 215 and the support portion 42 are fitted to each other and the overhanging portion 211 a that defines the open area S is included, the casing 1 and the rotor 5 are accompanied by thermal expansion. When the front bearing portion 21 moves, the front bearing portion 21 is prevented from tilting toward the overhanging portion 211a. As a result, the assembly consistency between the rotor 5 and the front bearing portion 21 can be maintained, the temperature rise of the white metal applied to the bearings 212 and 213 is suppressed, the durability of the bearings 212 and 213 is lowered, the lubricant is deteriorated, etc. It is possible to prevent the occurrence of defects.

  Moreover, since the lubricating oil supply pipe 6 can be piped in the open area S defined under the overhanging portion 211a, the space around the front bearing portion 21 can be used effectively, and the steam turbine can be downsized. become.

  As described above, according to the steam turbine of the second embodiment, it is possible to maintain the integrity of the assembly of the rotor 5 and the front bearing portion 21 while effectively using the space around the front bearing portion 21. .

  In the steam turbine according to the second embodiment, as in the steam turbine according to the first embodiment, the extending portion 214 extending below the overhanging portion 211a and the front bearing portion 21 including the extending portion 214 are provided. It has a configuration having a guide portion 41 to be supported. Thus, the rotor 5 and the front bearing portion 21 are effectively used while having the flange portion 215 and the support portion 42 in addition to the extension portion 214 and the guide portion 41, while effectively utilizing the space around the front bearing portion 21. It is possible to more suitably maintain the consistency of the assembly. In the steam turbine according to the second embodiment, the flange portion 215 and the support portion 42 are provided without using the extension portion 214 and the guide portion 41, so that the space around the front bearing portion 21 is effectively used. It is possible to maintain the integrity of the assembly between the rotor 5 and the front bearing portion 21.

[Embodiment 3]
In the third embodiment described below, the same parts as those in the above-described first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIGS. 5 and 6, the connection portion 3 includes a first connection member 31 connected to the front bearing portion 21 at the center of the front bearing portion 21 below the rotor 5, and both sides of the rotor 5. And a second connection member 32 connected to the front bearing portion 21 at each portion. Each connection member 31 and 32 is formed of H-shaped steel as viewed from the side, and the front and rear flanges 311 and 321 are fixed to the vehicle compartment 1 side and the front bearing portion 21 side by bolting or welding. Thus, the vehicle compartment 1 and the front bearing portion 21 are connected to each other by the plate-like webs 312 and 322 between the front and rear flanges 311 and 321.

  In the steam turbine having such a configuration, the first connecting member 31 and the second connecting member 32 are configured such that the webs 312 and 322 between the front and rear flanges 311 and 321 cause the front bearing portion 21 to move along with the thermal expansion of the passenger compartment 1 and the rotor 5. Move as if pushing. And when the front side bearing part 21 moves, the 2nd connection member 32 each arrange | positioned at the both sides of the rotor 5 of the front side bearing part 21 which deviates in the left-right direction of the axial center R as shown by the arrow X in FIG. Prevent swinging. Furthermore, when the front bearing portion 21 moves, the first connection member 31 and the second connection member 32 are arranged vertically so that the front side can be provided even if the projecting portion 211a that defines the open area S is provided. This prevents the bearing portion 21 from tilting toward the overhanging portion 211a. As a result, the assembly consistency between the rotor 5 and the front bearing portion 21 can be maintained, the temperature rise of the white metal applied to the bearings 212 and 213 is suppressed, the durability of the bearings 212 and 213 is lowered, the lubricant is deteriorated, etc. It is possible to prevent the occurrence of defects.

  Moreover, since the lubricating oil supply pipe 6 can be piped in the open area S defined under the overhanging portion 211a, the space around the front bearing portion 21 can be used effectively, and the steam turbine can be downsized. become.

  Further, the webs 312 and 322 of the first connection member 31 and the second connection member 32 are formed long in the left-right direction. For this reason, it is possible to prevent the swinging of the front bearing portion 21 more suitably. The webs 312 and 322 of the first connection member 31 and the second connection member 32 are not limited to a plate shape that is long in the left-right direction, and may be formed in a plate shape that is long in the vertical direction. When the webs 312 and 322 are formed in a plate shape that is long in the vertical direction, it is possible to suitably prevent a situation in which the front bearing portion 21 is inclined toward the protruding portion 211a. The webs 312 and 322 of the first connection member 31 and the second connection member 32 are not limited to a plate shape that is long in the left-right direction, and may be formed in a cross plate shape that is long in the up-down and left-right directions. When the webs 312 and 322 are formed in a cross plate shape, it is possible to more suitably prevent the front bearing portion 21 from swinging and to prevent the front bearing portion 21 from being inclined toward the overhanging portion 211a. is there.

  As described above, according to the steam turbine of the third embodiment, it is possible to maintain the integrity of the assembly of the rotor 5 and the front bearing portion 21 while effectively using the space around the front bearing portion 21. .

  In the steam turbine according to the third embodiment, similarly to the steam turbine according to the first embodiment, the extension portion 214 extending below the overhang portion 211a and the front bearing portion 21 including the extension portion 214 are provided. It has a configuration having a guide portion 41 to be supported. Thus, after having the extension part 214 and the guide part 41, the connection part 3 is comprised by the 1st connection member 31 and the 2nd connection member 32, and the space around the front side bearing part 21 is utilized effectively. However, it is possible to more suitably maintain the integrity of the assembly between the rotor 5 and the front bearing portion 21. Further, in the steam turbine according to the third embodiment, the front bearing is configured by configuring the connecting portion 3 with the first connecting member 31 and the second connecting member 32 without having the extending portion 214 and the guide portion 41. It is possible to maintain the integrity of the assembly of the rotor 5 and the front bearing portion 21 while effectively using the space around the portion 21. Further, although not shown in the drawing, the steam turbine of the third embodiment may have the flange portion 215 and the support portion 42 as in the steam turbine of the second embodiment.

[Embodiment 4]
In the fourth embodiment described below, the same parts as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIGS. 7 and 8, the front bearing portion 21 is provided with a key groove 216 formed along the extending direction of the axis R on the bottom surface facing the movable table 4 (guide portion 41). ing. Further, the moving table 4 is provided with a key 43 that fits into the key groove 216. Further, a rotating member 216 a that rotates while supporting the key 43 as the front bearing portion 21 moves is disposed in the key groove 216. The key groove 216 and the key 43 are formed in a rectangular shape, and the key 43 is loosely inserted into the key groove 216 with a gap, but the gap is maintained by the rotating member 216a and does not contact the key groove 216. It is configured as follows. The rotating member 216a is formed in a spherical or cylindrical shape, and is provided to rotate when the key 43 comes into contact with the movement of the front bearing portion 21.

  In the steam turbine having such a configuration, when the front bearing portion 21 moves with the thermal expansion of the casing 1 and the rotor 5, the friction resistance when the front bearing portion 21 moves due to the key groove 216, the rotating member 216 a, and the key 43. Therefore, even if it has the overhanging portion 211a that defines the open area S, the situation where the front bearing portion 21 is inclined toward the overhanging portion 211a is prevented. Further, when the front bearing portion 21 moves with the thermal expansion of the casing 1 and the rotor 5, the swinging of the front bearing portion 21 that deviates in the left-right direction of the axis R is caused by the key groove 216, the rotating member 216 a and the key 43. prevent. As a result, the assembly consistency between the rotor 5 and the front bearing portion 21 can be maintained, the temperature rise of the white metal applied to the bearings 212 and 213 is suppressed, the durability of the bearings 212 and 213 is lowered, the lubricant is deteriorated, etc. It is possible to prevent the occurrence of defects.

  Moreover, since the lubricating oil supply pipe 6 can be piped in the open area S defined under the overhanging portion 211a, the space around the front bearing portion 21 can be used effectively, and the steam turbine can be downsized. become.

  As described above, according to the steam turbine of the fourth embodiment, it is possible to maintain the integrity of the assembly of the rotor 5 and the front bearing portion 21 while effectively using the space around the front bearing portion 21. .

  Note that a plurality of key grooves 216 and keys 43 that fit each other may be provided. Further, the key groove 216 and the key 43 are not limited to a rectangular shape, and may be formed in a T shape, a hook shape, or the like. Further, a key groove may be provided in the movable table 4, and a key may be provided in the front bearing portion 21.

  In the steam turbine according to the fourth embodiment, as in the steam turbine according to the first embodiment, the extension portion 214 extending below the overhang portion 211a and the front bearing portion 21 including the extension portion 214 are provided. It has a configuration having a guide portion 41 to be supported. As described above, by having the extension portion 214 and the guide portion 41, and having the key groove 216, the rotating member 216a, and the key 43, the rotor 5 and the front side can be effectively used while using the space around the front bearing portion 21 effectively. It becomes possible to maintain the integrity of the assembly with the bearing portion 21 more suitably. Further, in the steam turbine according to the fourth embodiment, the space around the front bearing portion 21 is effectively obtained by having the key groove 216, the rotating member 216a, and the key 43 without having the extending portion 214 and the guide portion 41. It is possible to maintain the integrity of the assembly of the rotor 5 and the front bearing portion 21 while using it. Although not clearly shown in the figure, the steam turbine according to the fourth embodiment may include the flange portion 215 and the support portion 42 as in the steam turbine according to the second embodiment. Further, although not clearly shown in the figure, in the steam turbine of the fourth embodiment, the connection portion 3 is configured by the first connection member 31 and the second connection member 32 as in the steam turbine of the third embodiment. Also good.

  As described above, the steam turbine according to the present invention is suitable for maintaining the integrity of the assembly between the rotor and the bearing portion while effectively utilizing the space around the bearing portion.

DESCRIPTION OF SYMBOLS 1 Cabin 11 Stator vane 12 Steam inlet 13 Steam outlet 2 Bearing part 21 Front side bearing part 211 Storage part 211a Overhang part 212 Journal bearing 213 Thrust bearing 214 Extension part 215 Flange part 216 Keyway 216a Rotating member 22 Rear bearing part 221 accommodating portion 222 journal bearing 3 connecting portion 31 first connecting member 311 flange 312 web 32 second connecting member 321 flange 322 web 4 moving table 41 guide portion 42 supporting portion 43 key 5 rotor 51 moving blade 6 lubricating oil supply pipe 6a connection Tube 7 Fixed base 8 Mounting base R Axis center S Open area

Claims (7)

A casing in which the rotor is accommodated, a journal bearing that rotatably supports the rotor, and a thrust bearing that receives a force acting in the extending direction of the axial center of the rotor are supported, and an end portion of the rotor is accommodated A bearing part that defines an open area below an overhanging part that projects in an extending direction of the shaft center of the rotor, a connection part that connects the vehicle compartment and the bearing part, and the bearing part. In a steam turbine comprising a moving base that is movably supported along an extending direction of an axis of the rotor,
The bearing portion includes an extending portion that extends below the overhanging portion and defines the open area with the overhanging portion. A steam turbine comprising a guide portion that is provided below the protruding portion and that faces the bottom surface of the bearing portion and guides the movement of the bearing portion.   The bearing portion includes a flange portion that is provided to extend laterally along the moving direction of the bearing portion, and the moving base is fitted to the flange portion on the vehicle cabin side and the bearing portion The steam turbine according to claim 1, further comprising a support portion that guides movement of the steam turbine.   The connection portion includes a first connection member that is connected to the lower side of the rotor and at the center of the bearing portion, and second connection members that are connected to both sides of the rotor. The steam turbine according to claim 1 or 2, characterized by the above.   The bearing portion includes a keyway or a key formed along a direction in which the axis of the rotor extends in a bottom surface facing the moving table, and the moving table includes the keyway or the key. A rotating member that rotates while supporting the key as the bearing moves is disposed in the key groove. The steam turbine as described in any one of 1-3. A casing in which the rotor is accommodated, a journal bearing that rotatably supports the rotor, and a thrust bearing that receives a force acting in the extending direction of the axial center of the rotor are supported, and an end portion of the rotor is accommodated A bearing part that defines an open area below an overhanging part that projects in an extending direction of the shaft center of the rotor, a connection part that connects the vehicle compartment and the bearing part, and the bearing part. In a steam turbine comprising a moving base that is movably supported along an extending direction of an axis of the rotor,
The bearing portion includes a flange portion that is provided so as to project laterally along the moving direction of the bearing portion, and the moving base is fitted to the flange portion on the vehicle cabin side to A steam turbine comprising a support for guiding movement. A casing in which the rotor is accommodated, a journal bearing that rotatably supports the rotor, and a thrust bearing that receives a force acting in the extending direction of the axial center of the rotor are supported, and an end portion of the rotor is accommodated A bearing part that defines an open area below an overhanging part that projects in an extending direction of the shaft center of the rotor, a connection part that connects the vehicle compartment and the bearing part, and the bearing part. In a steam turbine comprising a moving base that is movably supported along an extending direction of an axis of the rotor,
The connection portion includes a first connection member that is connected to the lower side of the rotor and at the center of the bearing portion, and second connection members that are connected to both sides of the rotor. A steam turbine characterized by that. A casing in which the rotor is accommodated, a journal bearing that rotatably supports the rotor, and a thrust bearing that receives a force acting in the extending direction of the axial center of the rotor are supported, and an end portion of the rotor is accommodated A bearing part that defines an open area below an overhanging part that projects in an extending direction of the shaft center of the rotor, a connection part that connects the vehicle compartment and the bearing part, and the bearing part. In a steam turbine comprising a moving base that is movably supported along an extending direction of an axis of the rotor,
The bearing portion includes a keyway or a key formed along a direction in which the axis of the rotor extends in a bottom surface facing the moving table, and the moving table includes the keyway or the key. A steam turbine having a key or a key groove that fits into the key groove, and a rotating member that rotates while supporting the key as the bearing portion moves in the key groove. .

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