JP6201548B2 - Rotating machine - Google Patents

Description

  The present invention relates to a rotating machine.

  The steam turbine rotates the steam turbine rotor by allowing steam to flow into the steam turbine casing and causing the steam that has flowed to work. In the steam turbine casing, the pressure gradually decreases while the steam is working. Therefore, a structure is known in which the steam is further supplied from the middle stage of the steam turbine to increase the pressure after the middle stage in the steam turbine casing to improve the output of the steam turbine.

  For example, Patent Document 1 discloses a structure including a steam control valve that allows steam from a steam supply source to flow from the upstream side of the steam turbine, and an overload steam control valve that allows steam to flow from the middle stage of the steam turbine. Yes. In the steam turbine, steam is introduced from the upstream side of the steam turbine by adjusting the opening of the steam control valve during rated operation. And the steam is made to flow in from the middle stage of the steam turbine by adjusting the opening degree of the overload steam control valve arranged downstream from the steam control valve. Thereby, the output of the steam turbine is improved by causing the high-pressure steam to flow into the middle stage of the steam turbine where the pressure of the steam flowing from the upstream side of the steam turbine is reduced.

JP-A-06-002504

  By the way, when the steam, which is a fluid, is introduced from the middle stage of the steam turbine, which is a rotating machine, it is preferable that the steam is uniformly introduced around the rotor in the steam turbine casing. This is because the rotor is efficiently rotated without applying an extra load such as an uneven load in the circumferential direction of the rotor.

  The present invention has been made to meet the above-described demand, and an object of the present invention is to provide a rotating machine that can improve the rotational efficiency of a rotor when a fluid is introduced from the middle stage of the rotating machine.

In order to solve the above problems, the present invention proposes the following means.
A rotating machine according to a first aspect of the present invention includes a casing having a plurality of stationary blades provided on an inner peripheral surface and a plurality of moving blades provided on an outer peripheral surface, and is rotatably supported in the casing. A main flow inlet that introduces a main fluid, a main flow path that communicates with the main flow inlet and extends in the axial direction of the rotor, and a downstream of the main flow inlet in the axial direction. an auxiliary inlet for introducing an auxiliary fluid provided on a side, to communicate the auxiliary input mouth auxiliary flow extending along the circumferential direction of the rotor communicating with the passage, and the main channel and the auxiliary channel A plurality of communication portions are formed, and the auxiliary flow path is provided with a branching portion that branches and guides the auxiliary fluid flowing from the auxiliary inlet into one side and the other side in the circumferential direction at a predetermined ratio. It is, the communication unit, before the said supplementary passage From the side surface on the downstream side in the axial direction, extending toward the inner side in the radial direction with respect to the rotor while facing the downstream side in the axial direction and inclined with respect to the axial direction, The moving blade is connected to a position between the moving blade and the stationary blade adjacent to the downstream side in the axial direction .

  According to the rotating machine having such a configuration, by providing the branching portion in the auxiliary flow path, the auxiliary fluid introduced from the auxiliary inlet is given a predetermined ratio in the auxiliary flow path at one side and the other side in the circumferential direction. It is possible to guide by branching to Therefore, the auxiliary fluid to be introduced into the auxiliary flow path is introduced while causing a drift that unintentionally flows in a concentrated manner on either one side or the other side of the annular auxiliary flow path. Can be prevented. Therefore, the auxiliary fluid can be circulated uniformly in the auxiliary flow path. That is, when the auxiliary fluid is mixed into the main fluid flowing through the main flow path, the auxiliary fluid can be evenly introduced from different positions in the circumferential direction of the rotor. Therefore, it is possible to prevent the loss when the main fluid and the auxiliary fluid are mixed in the main flow path from being varied at different positions in the circumferential direction. Thereby, the rotation efficiency of the rotor can be improved when the auxiliary fluid is allowed to flow from the middle stage of the rotary machine without causing an unnecessary load on the rotor.

  Further, in the rotary machine according to another aspect of the present invention, the branch portion has a protruding portion that protrudes toward the auxiliary inlet at the same position as the auxiliary inlet in the circumferential direction in the auxiliary flow path. May be.

  According to the rotating machine having such a configuration, the protrusion is formed at the same position as the auxiliary inlet in the circumferential direction in the auxiliary flow path, so that the auxiliary fluid introduced from the auxiliary inlet is caused to collide with the protrusion. It is easy to flow in the auxiliary flow path. That is, the auxiliary fluid introduced from the auxiliary inlet flows into the auxiliary flow path along the shape of the protrusion. Therefore, by adjusting the shape of the protruding portion, the auxiliary fluid can be easily branched and guided to one side and the other side in the circumferential direction at a predetermined ratio. Thereby, a branch part can be provided easily and it can prevent easily that the auxiliary fluid introduce | transduced into an auxiliary flow path drifts to either one side or the other side.

  Furthermore, the rotary machine which concerns on the other aspect of this invention WHEREIN: The said protrusion part may be formed by diameter-reducing gradually toward the said auxiliary entrance.

  According to the rotating machine having such a configuration, when the auxiliary fluid introduced from the auxiliary inlet collides with the protruding portion, the protruding portion is radially reduced from the apex by forming the protruding portion with the diameter gradually reduced toward the auxiliary inlet. It can be branched to spread evenly. For this reason, the auxiliary fluid can be easily guided and distributed in the auxiliary flow path by being branched at an equal ratio between one side and the other side in the circumferential direction.

  Further, in the rotary machine according to another aspect of the present invention, the protruding portion is formed such that inclined surfaces inclined from one side and the other side in the circumferential direction extend in the axial direction toward the auxiliary inlet. Also good.

  According to the rotating machine having such a configuration, the protruding portion is formed with the inclined surfaces inclined from the one side and the other side, so that the auxiliary fluid introduced from the auxiliary inlet is inclined when colliding with the protruding portion. It can be branched so as to spread evenly on one side and the other side in the circumferential direction along the surface. Thus, the auxiliary fluid can be more reliably and easily branched and guided and distributed in the auxiliary flow path at an equal ratio between one side and the other side in the circumferential direction.

  Further, in the rotary machine according to another aspect of the present invention, the auxiliary flow path has a plurality of communication portions in the circumferential direction communicating with the main flow path, and the flow path is increased as the distance from the auxiliary inlet is increased. You may form so that an area may reduce gradually.

  According to the rotating machine having such a configuration, the auxiliary flow path is formed such that the flow area of the auxiliary flow path gradually decreases as the distance from the position where the auxiliary inlet is formed, The flow rate of the auxiliary fluid flowing through the auxiliary flow path increases as the distance increases from the position where the auxiliary inlet is formed. Therefore, the flow rate of the auxiliary fluid that flows into the main flow path via the communication portion can be made close to a constant regardless of the position where the communication portion is formed. Therefore, it is possible to more reliably suppress the loss when the main fluid and the auxiliary fluid are mixed in the main flow path due to different positions in the circumferential direction. Thereby, the eccentric load etc. in the circumferential direction of the rotor does not occur, and the rotation efficiency of the rotor can be further improved when the auxiliary fluid is introduced from the middle stage of the rotary machine.

  Furthermore, in the rotating machine according to another aspect of the present invention, a plurality of the auxiliary inlets may be arranged apart from each other in the circumferential direction of the casing.

  According to the rotating machine having such a configuration, a plurality of auxiliary inlets are arranged apart from each other in the circumferential direction of the casing, so that auxiliary fluid can be introduced from different locations in the circumferential direction in the auxiliary flow path. . Therefore, it is possible to easily circulate the auxiliary fluid that circulates in the auxiliary flow path in a more uniform state.

  Furthermore, in the rotating machine according to another aspect of the present invention, the casing is a steam turbine casing, the rotor is a steam turbine rotor, the main fluid is main steam, and the auxiliary fluid is overload steam. May be.

  According to the rotating machine having such a configuration, overload steam can be efficiently used as a steam turbine, and the rotation efficiency of the steam turbine rotor can be improved when fluid is introduced from the middle stage of the steam turbine.

  According to the rotating machine of the present invention, the rotational efficiency of the rotor can be improved when a fluid is introduced from the middle stage of the rotating machine without causing an uneven load or the like in the circumferential direction of the rotor.

It is a mimetic diagram showing the steam turbine in a first embodiment concerning the present invention. It is a mimetic diagram showing the high pressure turbine in a first embodiment concerning the present invention. It is sectional drawing in the area | region III of FIG. 2 which shows the auxiliary flow path in the high pressure turbine in 1st embodiment which concerns on this invention. It is sectional drawing orthogonal to the axial direction of the high pressure turbine in 1st embodiment which concerns on this invention. It is a schematic diagram which shows the branch part in 1st embodiment which concerns on this invention. It is a schematic diagram which shows the 1st modification of the branch part which concerns on this invention. It is a schematic diagram which shows the 2nd modification of the branch part which concerns on this invention.

Hereinafter, a first embodiment according to the present invention will be described with reference to FIGS. 1 and 2.
A steam turbine plant 100 using a steam turbine 1 which is a rotating machine according to a first embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 1, the steam turbine plant 100 includes a rotor 11 that rotates about an axis O, a steam turbine 1 connected to the rotor 11, and steam S that is fluid from a steam supply source (not shown). From the steam supply pipe 12, the main steam branch pipe 13 branched from the steam supply pipe 12 to supply the steam S to the upstream side of the steam turbine 1, and the main steam branch pipe 13 branched from the steam supply pipe 12 Further, an overload steam branch pipe 14 that supplies steam S to the middle stage of the steam turbine 1 on the downstream side and a steam discharge pipe 15 that is connected to the downstream side of the steam turbine 1 and discharges steam are provided.

  Here, in the steam turbine 1, the inlet side into which the steam S flows is the upstream side (for example, the left side in FIG. 1 and FIG. 2), and the outlet side from which the steam S is discharged is the downstream side (for example, FIG. 1 and FIG. 2).

The steam supply pipe 12 has a supply valve that adjusts the flow rate of the steam S flowing through the steam supply pipe 12. The steam supply pipe 12 adjusts the supply amount of the steam S supplied to the steam turbine 1 by adjusting the opening amount of the supply valve.
The main steam branch pipe 13 supplies the steam S having a flow rate that is the rated load of the steam turbine 1 out of the steam S supplied from the steam supply source via the steam supply pipe 12 to the upstream side of the steam turbine 1. The main steam branch pipe 13 has a steam adjustment valve that adjusts the supply amount of the steam S to the upstream side of the steam turbine 1.
The overload steam branch pipe 14 supplies, to the middle stage of the steam turbine 1, the steam S that exceeds the flow rate that becomes the rated load among the steam S that is supplied from the steam supply source via the steam supply pipe 12. The overload steam branch pipe 14 has an overload steam adjustment valve that supplies the steam S to the middle stage of the steam turbine 1 downstream of the steam supply pipe 12 and adjusts the supply amount of the steam S.
The steam discharge pipe 15 discharges the steam that has worked in the steam turbine 1 from the steam turbine 1.

  In the present embodiment, the steam S supplied from the inlet of the steam turbine 1 and the steam S supplied via the main steam branch pipe 13 is the main steam S1 as the main fluid. Moreover, it is the steam S supplied to the middle stage of the steam turbine 1, and the steam S supplied via the overload steam branch pipe 14 is referred to as an overload steam S2 that is an auxiliary fluid.

As shown in FIG. 2, the steam turbine 1 supports a steam turbine casing 2, a steam turbine rotor 3 extending along the axis O so as to penetrate the steam turbine casing 2, and a rotor 11 rotatably about the axis O. The bearing part 4 to be provided is provided.
Here, the steam turbine 1 is an external combustion engine that extracts the energy of the steam S, which is a fluid, as rotational power, and is a device that is used by being connected to a generator or the like in a power plant.

As shown in FIG. 3, the steam turbine casing 2 circulates the main steam S <b> 1 in a flow path formed inside. The steam turbine casing 2 is a casing that covers the steam turbine rotor 3 from the outside. The steam turbine casing 2 is provided with a stationary blade 21 on the inner peripheral surface. The steam turbine casing 2 has an inner casing 22 that is an inner casing and has a cylindrical shape that can be divided, and an outer casing 23 that covers the inner casing 22 from the outside in the radial direction. Further, the steam turbine casing 2 is formed with a main inlet 24 for introducing the main steam S1 at the inlet, and a main flow path 25 that communicates with the main inlet 24 and extends along the axial direction of the steam turbine rotor 3. The steam turbine casing 2 is provided on the downstream side in the axial direction with respect to the main inflow port 24, and is connected to the auxiliary inlet 26 and the main flow path 25 to introduce the overload steam S 2. An annular auxiliary flow path 27 along the direction is formed.
The steam turbine rotor 3 is a rotating shaft that is integrally connected to the rotor 11 and is rotatably supported around the axis O in the steam turbine casing 2. The steam turbine rotor 3 is provided with moving blades 31 on the outer peripheral surface.
The bearing unit 4 includes a journal bearing device and a thrust bearing device.

The main inflow port 24 supplies main steam S <b> 1 supplied via the main steam branch pipe 13 into the steam turbine casing 2. The main inlet 24 is connected to the main steam branch pipe 13 and is formed at the inlet of the steam turbine casing 2 in the steam turbine 1.
The main flow path 25 circulates the main steam S1 flowing in from the main inlet 24 from the upstream side to the downstream side of the steam turbine 1 along the axial direction. The main flow path 25 is formed in the inner casing 22 in the steam turbine casing 2 along the axial direction of the steam turbine rotor 3 from the main inflow port 24 toward the downstream side. That is, the main flow path 25 is formed around the steam turbine rotor 3 so as to extend in the steam turbine casing 2 along the axial direction. In the main flow path 25, a moving blade 31 provided in the steam turbine rotor 3 and a stationary blade 21 provided in the steam turbine casing 2 are arranged.

  As shown in FIGS. 3 and 4, the auxiliary inlet 26 supplies the overload steam S <b> 2 supplied through the overload steam branch pipe 14 into the steam turbine casing 2. The auxiliary inlet 26 is connected to the overload steam branch pipe 14, and is formed in the middle stage of the steam turbine casing 2, which is downstream in the axial direction from the main inlet 24, through the outer casing 23 to the inner casing 22. Yes. The middle stage of the steam turbine casing 2 in which the auxiliary inlet 26 is formed may be downstream in the axial direction from the main inlet 24 and between the inlet and outlet of the steam turbine 1, and depends on the steam turbine 1 used. May be set as appropriate. A plurality of auxiliary inlets 26 are arranged apart from each other in the circumferential direction of the steam turbine casing 2. In the present embodiment, the auxiliary inlets 26 are disposed at two positions 180 degrees apart in the circumferential direction of the steam turbine casing 2.

The auxiliary flow path 27 circulates the overload steam S <b> 2 flowing in from the auxiliary inlet 26 in the circumferential direction of the steam turbine rotor 3 and then supplies it to the main flow path 25. The auxiliary flow path 27 is formed in an annular shape in the inner casing 22 so as to extend along the circumferential direction of the steam turbine rotor 3 so as to cover the main flow path 25 from the radially outer side. The auxiliary channel 27 is formed such that the channel area, which is the cross-sectional area in the radial direction of the auxiliary channel 27, gradually decreases as the distance from the position where the auxiliary inlet 26 is formed increases. Specifically, in the present embodiment, the auxiliary flow path 27 is formed so as to be gradually narrowed away from the position communicating with the auxiliary inlet 26, and the other auxiliary inlet 26 provided on the opposite side of 180 degrees. It is formed so that the cross section of the flow path gradually returns as it approaches. That is, the flow passage area is formed to be the smallest so that the flow amount of the overload steam S2 is minimized at a position 90 degrees away from the position where the auxiliary inlet 26 is formed in the circumferential direction. The auxiliary flow path 27 has a protruding portion 10 (branch portion) that branches and guides the overload steam S2 flowing from the auxiliary inlet 26 to one side and the other side in the circumferential direction in the auxiliary flow path 27 at a predetermined ratio. Is formed. The auxiliary flow path 27 has a plurality of communication portions 20 that communicate with the main flow path 25 on the inner surface of the flow path on the radially inner side.
Here, the one side in the circumferential direction of the auxiliary flow path 27 is the counterclockwise direction in FIG. 4, and the other side in the circumferential direction is the clockwise direction in FIG.

  The protruding portion 10 is a branching portion that guides the overload steam S <b> 2 flowing from the auxiliary inlet 26 by being branched at a predetermined ratio between one side and the other side in the circumferential direction. In the present embodiment, the protruding portion 10 is formed so as to equally branch the overload steam S2 introduced from the auxiliary inlet 26 into one side and the other side. Specifically, in the present embodiment, the protruding portion 10 is formed at the same position as the auxiliary inlet 26 in the circumferential direction of the radially inner surface in the auxiliary flow path 27. As shown in FIG. 5, the protruding portion 10 is formed to protrude in a conical shape so as to gradually reduce the diameter toward the auxiliary inlet 26.

  The communication unit 20 is a channel formed by communicating the auxiliary channel 27 and the main channel 25. Specifically, it is formed to extend in the radial direction from the auxiliary flow path 27 toward the main flow path 25 at 10 locations spaced in the circumferential direction around the axis O. As shown in FIG. 3, the communication portion 20 is inclined toward the downstream side in the axial direction so as to intersect the auxiliary flow channel 27 and the main flow channel 25 from the side surface on the downstream side in the axial direction of the auxiliary flow channel 27. Is formed.

Next, the operation of the steam turbine 1 that is the rotating machine of the present embodiment having the above-described configuration will be described.
In the steam turbine plant 100 of the embodiment as described above, the steam S from the steam supply source is supplied to the steam turbine 1 through the steam supply pipe 12. Specifically, the steam S flowing through the steam supply pipe 12 is supplied to the main steam branch pipe 13 and the overload steam branch pipe 14 by opening the supply valve. The steam S supplied to the main steam branch pipe 13 is supplied into the steam turbine casing 2 as the main steam S1 so that the steam turbine 1 is rated. That is, the steam S is introduced into the main flow path 25 from the main inlet 24 formed at the inlet of the steam turbine 1 as the main steam S1, while the supply amount is adjusted by the steam control valve. The main steam S1 introduced into the main flow path 25 collides with the moving blade 31 and flows toward the downstream side while expanding by flowing through the main flow path 25. Thereby, the steam turbine rotor 3 is rotated and the energy of the steam S is taken out as rotational power.

  Moreover, the steam S supplied to the overload steam branch pipe 14 is the steam turbine casing from the inlet of the steam turbine 1 as the main steam S1 among the steam S supplied through the steam supply pipe 12 as the overload steam S2. 2 is the steam S in excess of the flow rate supplied in 2. Specifically, the supply amount of the overload steam S2 is adjusted by the overload steam control valve, and the auxiliary flow path 27 is simultaneously supplied from the two auxiliary inlets 26 formed in the middle stage of the steam turbine 1 as the overload steam S2. Introduced in. The overload steam S2 introduced from the auxiliary inlet 26 into the auxiliary flow path 27 collides with the protrusion 10 at the same position as the auxiliary inlet 26, and the auxiliary flow path 27 is moved to one side and the other side in the circumferential direction. Divide equally and enter. When the overload steam S <b> 2 flows through the auxiliary flow path 27, the overload steam S <b> 2 uniformly flows into the main flow path 25 from the plurality of communication portions 20 formed in the auxiliary flow path 27, and the main steam S <b> 1 in the main flow path 25. The pressure on the downstream side of the middle stage in the main flow path 25 is increased. Thereby, the steam turbine 1 improves the pressure state on the downstream side and improves the output.

  According to such a steam turbine 1, the overload steam S <b> 2 introduced from the auxiliary inlet 26 is provided in the auxiliary flow path 27 at a predetermined ratio by providing the protruding portion 10 that is a branching portion in the auxiliary flow path 27. It is possible to guide by branching to one side and the other side in the circumferential direction at a certain equal ratio. For this reason, the overload steam S2 that is the auxiliary fluid introduced into the auxiliary flow path 27 flows unintentionally in one direction or the other side in the annular auxiliary flow path 27 in a concentrated manner. It can be prevented from being introduced while causing drift. Therefore, the overload steam S2 can be uniformly circulated in the auxiliary flow path 27. That is, when the overload steam S2 flowing through the auxiliary flow path 27 is mixed into the main steam S1 flowing through the main flow path 25, the overload is equally overloaded from the plurality of communication portions 20 at different positions in the circumferential direction of the steam turbine rotor 3. Steam S2 can be introduced. Therefore, it is possible to prevent the loss when the main steam S1 and the overload steam S2 are mixed in the main flow path 25 from being varied at different positions in the circumferential direction. This can improve the rotational efficiency of the steam turbine rotor 3 when the overload steam S2 is introduced from the middle stage of the steam turbine 1 without causing an unnecessary load such as an uneven load in the circumferential direction of the steam turbine rotor 3. .

  Further, since the protruding portion 10 is formed at the same position as the auxiliary inlet 26 in the circumferential direction in the auxiliary flow path 27, the overload steam S2 introduced from the auxiliary inlet 26 is caused to collide with the protruding portion 10 and the auxiliary flow. It can be easily made to flow in the path 27. That is, the overload steam S <b> 2 introduced from the auxiliary inlet 26 flows into the auxiliary flow path 27 along the shape of the protrusion 10. Therefore, by adjusting the shape of the protrusion 10, the overload steam S2 can be easily branched and guided to one side and the other side in the circumferential direction at a predetermined ratio. Thereby, a branch part can be provided easily and it can prevent easily that overload vapor | steam S2 introduce | transduced into the auxiliary | assistant flow path 27 drifts to either one side or the other side.

  Further, by forming the protruding portion 10 into a conical shape that protrudes gradually toward the auxiliary inlet 26, when the overload steam S2 introduced from the auxiliary inlet 26 collides with the protruding portion 10, the conical shape. It can be branched so that it spreads radially from the top of the. Therefore, the overload steam S2 can be easily branched and guided and distributed in the auxiliary flow path 27 at one side and the other side in the circumferential direction.

In addition, the auxiliary flow path 27 is formed such that the flow path area, which is the cross-sectional area in the radial direction of the auxiliary flow path 27, gradually decreases as the distance from the position where the auxiliary inlet 26 is formed. The flow rate of the overload steam S2 that flows through the auxiliary flow path 27 increases as the distance increases from the position where the auxiliary inlet 26 is formed.
By supplying the overload steam S2 to the main channel 25 from the plurality of communication portions 20 formed in the circumferential direction of the auxiliary channel 27, the flow rate of the overload steam S2 flowing through the auxiliary channel 27 decreases. However, since the auxiliary flow path 27 is formed so that the flow velocity increases as the distance from the position where the auxiliary inlet 26 is formed, the excess flow through the auxiliary flow path 27 accompanying the decrease in the flow rate. A decrease in the flow rate of the load steam S2 can be prevented. Therefore, regardless of the position where the communication part 20 is formed, the flow rate of the overload steam S2 flowing into the main flow path 25 via the communication part 20 can be made close to a constant value. Therefore, it is possible to more reliably suppress the loss that occurs when the main steam S1 and the overload steam S2 are mixed in the main flow path 25 due to different positions in the circumferential direction. Thereby, the eccentric load etc. in the circumferential direction of the steam turbine rotor 3 do not occur, and the rotation efficiency of the steam turbine rotor 3 can be further improved when the overload steam S2 is introduced from the middle stage of the steam turbine 1.

Furthermore, the plurality of auxiliary inlets 26 are arranged apart from each other in the circumferential direction of the steam turbine casing 2, so that the overload steam S <b> 2 can be introduced from different locations in the circumferential direction in the auxiliary flow path 27. Therefore, it is possible to easily circulate the overload steam S2 that circulates in the auxiliary flow path 27 in a more uniform state.
Further, as in the present embodiment, the two auxiliary inlets 26 are arranged at positions separated by 180 degrees, so that the overload steam S2 introduced from one auxiliary inlet 26 is sufficiently in the auxiliary flow path 27. Even if it is not distributed, the overload steam S2 can be efficiently introduced into the auxiliary flow path 27.

Next, a first modification of the protruding portion 101 will be described with reference to FIG.
In the first modification, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The protrusion 101 of the first modification is different from the first embodiment in shape.

  That is, as shown in FIG. 6, the protruding portion 101 of the first modified example is formed in a triangular prism shape with inclined surfaces 101 a inclined from one side and the other side in the circumferential direction toward the auxiliary inlet 26 in the axial direction. ing. In other words, the protruding portion 101 is a plane inclined perpendicularly to the axis by forming a rectangular inclined surface 101a by gradually rising uniformly from one side and the other side in the circumferential direction of the radially inner surface of the auxiliary flow path 27. The cross section when cut is formed in a triangular prism shape having a triangular shape.

  Thus, when the protruding portion 101 is formed with the inclined surface 101a inclined from the one side and the other side, when the overload steam S2 introduced from the auxiliary inlet 26 collides with the protruding portion 101, it has a triangular shape. Can be branched so as to spread evenly from one apex to the other in the circumferential direction along the inclined surface 101a. Therefore, the overload steam S2 can be more reliably and easily branched and guided and distributed in the auxiliary flow path 27 at an equal ratio between one side and the other side in the circumferential direction.

Next, a second modification of the protruding portion 102 will be described with reference to FIG.
In the second modification, the same components as those in the embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The protrusion 102 of the second modification is also different from the first embodiment in shape.

  That is, as shown in FIG. 7, the protruding portion 102 of the second modified example is a downstream side in the axis O direction in which the apex of the protruding portion 102 in the embodiment is a connecting portion between the auxiliary flow path 27 and the inlet of the communicating portion 20. It is formed to extend toward. That is, the protrusion 102 extends so as to protrude toward the downstream side in the axial direction while gradually reducing the diameter toward the auxiliary inlet 26.

  As described above, the protruding portion 102 gradually decreases in diameter toward the auxiliary inlet 26 and extends so as to protrude toward the inlet of the communicating portion 20 on the downstream side in the axial direction. Even if it is connected to the side surface of the passage 27 in the axial direction, the flow of the introduced overload steam S2 can be branched. That is, as in the present embodiment, even when the communication portion 20 is formed while being inclined toward the downstream side in the axial direction from the auxiliary flow path 27, the overloaded steam S2 that is reliably introduced is generated. One side and the other side in the circumferential direction can also be branched and guided at a predetermined ratio.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the configurations and combinations of the embodiments in the embodiments are examples, and the addition and omission of configurations are within the scope not departing from the gist of the present invention. , Substitutions, and other changes are possible. Further, the present invention is not limited by the embodiments, and is limited only by the scope of the claims.

It should be noted that the predetermined ratio for branching the overload steam S2 introduced from the auxiliary inlet 26 by the projecting portions 10, 101, 102 which are branch portions in the present embodiment and the modification is limited to an equal ratio. It is not a thing, and it is distributed only to either one side of one side or the other side like 10 to 0, or the ratio which flows to one side of either one side or the other side like 1 to 9 Such a ratio may be used.
Further, the auxiliary flow path 27 is not limited to being annularly formed in the circumferential direction of the steam turbine rotor 3 as in the present embodiment. For example, the auxiliary flow path 27 is 180 ° in the circumferential direction of the steam turbine rotor 3. The two auxiliary inlets 26 that are separated from each other are formed in a circular arc shape that is symmetric about the axis, or are formed as a plurality of flow paths that form circular arcs of different lengths from a plurality of auxiliary inlets 26. You may do it.
The rotating machine according to the present invention is not limited to the steam turbine 1 of the present embodiment, and can be used for a gas turbine, a centrifugal compressor, and the like, for example. That is, the fluid to be circulated is not limited to the main steam S1 or the overload steam S2, and an appropriate fluid may be appropriately selected according to the rotating machine to be used.
Furthermore, the branching portion is not limited to the protruding portions 10, 101, 102, and any branching portion may be used as long as it can adjust the flow of the overload steam S2, which is an inflowing auxiliary fluid.
Further, the auxiliary inlet 26 is not limited to being provided at two locations apart from each other in the circumferential direction of the steam turbine casing 2 as in the present embodiment, and may be, for example, one location, Two or more locations may be used.

DESCRIPTION OF SYMBOLS 100 ... Steam turbine plant O ... Axis S ... Steam S1 ... Main steam S2 ... Overload steam 1 ... Steam turbine 11 ... Rotor 12 ... Steam supply pipe 13 ... Main steam branch pipe 14 ... Overload steam branch pipe 15 ... Steam discharge pipe DESCRIPTION OF SYMBOLS 2 ... Steam turbine casing 3 ... Steam turbine rotor 4 ... Bearing part 21 ... Stator blade 22 ... Inner casing 23 ... Outer casing 24 ... Main inflow port 25 ... Main flow path 26 ... Auxiliary inlet 27 ... Auxiliary flow path 10 ... Protrusion part 20 ... Communication part 31 ... Rotor blade 101 ... Projection part 101a ... Inclined surface 102 ... Projection part

Claims (7)

A casing provided with a plurality of vanes on the inner peripheral surface;
A plurality of rotor blades provided on the outer peripheral surface, and a rotor supported rotatably in the casing,
In the casing, a main inlet for introducing a main fluid,
A main flow path communicating with the main flow inlet and along the axial direction of the rotor;
An auxiliary inlet that is provided downstream of the main flow inlet in the axial direction and introduces an auxiliary fluid;
A supplementary passage which communicates with said auxiliary input mouth extends along the circumferential direction of the rotor,
A plurality of communicating portions for communicating the auxiliary channel and the main channel;
Formed,
The auxiliary flow path is provided with a branching portion that branches and guides the auxiliary fluid flowing from the auxiliary inlet into one side and the other side in the circumferential direction at a predetermined ratio,
The communication portion extends from the side surface of the auxiliary flow path on the downstream side in the axial direction toward the downstream side in the axial direction and extends radially inward with respect to the rotor and is inclined with respect to the axial direction. The rotary machine is connected to a position in the main flow path between the moving blade and the stationary blade adjacent to the moving blade on the downstream side in the axial direction .   2. The rotating machine according to claim 1, wherein the branch portion has a protruding portion that protrudes toward the auxiliary inlet at the same position as the auxiliary inlet in the circumferential direction in the auxiliary flow path.   The rotating machine according to claim 2, wherein the protruding portion is formed with a diameter gradually reduced toward the auxiliary inlet.   3. The rotating machine according to claim 2, wherein the protruding portion is formed such that inclined surfaces inclined from one side and the other side in the circumferential direction extend in the axial direction toward the auxiliary inlet. The auxiliary flow path has a plurality of communication portions in the circumferential direction communicating with the main flow path,
The rotating machine according to any one of claims 1 to 4, wherein the flow path area is gradually reduced as the distance from the auxiliary inlet increases.   The rotating machine according to any one of claims 1 to 5, wherein a plurality of the auxiliary inlets are spaced apart from each other in a circumferential direction of the casing. The casing is a steam turbine casing;
The rotor is a steam turbine rotor;
The main fluid is main steam;
The rotating machine according to any one of claims 1 to 6, wherein the auxiliary fluid is overloaded steam.

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