JP5805283B2 - Steam turbine vane, steam turbine - Google Patents

Description

  The present invention relates to a stationary blade of a steam turbine in which a space is formed. The present invention also relates to a steam turbine having a stationary blade in which a space is formed.

  In a stationary blade and a steam turbine of a steam turbine, a technique is known in which a hollow structure is formed in which a space is formed inside the stationary blade in order to reduce the weight. In order to improve the performance of the stationary blades and the steam turbines of the steam turbine, a slit is provided in the stationary blade to connect the inner space of the stationary blade with the outside, and water (steam, There has been proposed a technique for removing water droplets by taking them into the internal space of the stationary blade (see, for example, Patent Document 1).

  For hollow vanes, depending on the outer shape (geometrical shape) and mass of the vane, and the surrounding environment of the vane during turbine operation (for example, the flow velocity and mass of steam passing through the vane) Self-excited vibration (flutter) may occur. This self-excited vibration is likely to occur when the mass of the stationary blade is small and when the blade width (the entire length of the blade) is long. In particular, in recent years, in order to improve the efficiency of the turbine, the mass of the stationary blade tends to be reduced and the blade width tends to be increased. For this reason, self-excited vibration tends to occur more easily.

  Thus, a technique has been proposed that can suppress self-excited vibration in a stationary vane having a hollow structure (see, for example, Patent Document 2). In this technique, a sliding contact member (leaf spring member) capable of sliding contact (elastic contact) from a cavity (internal space) to a blade inner surface (inner surface of a blade member) is provided. In this technology, when the stationary blade is elastically deformed, the sliding contact member slides from the cavity to the blade inner surface, and friction is generated between the blade and the blade inner surface. This friction attenuates the elastic deformation of the stationary blade and occurs in the stationary blade. Self-excited vibration is suppressed.

  Here, the larger the area in which the sliding contact member is in sliding contact with the blade inner surface, the more the self-excited vibration generated in the stationary blade can be reliably suppressed. However, due to manufacturing tolerances (manufacturing variation) of the stationary blade and the sliding contact member, the sliding contact member may come into contact with the inner surface of the blade, and a sliding contact area as designed (planned or calculated) may not be obtained.

  As described above, in the stationary blade and the steam turbine of the steam turbine, the manufacturing tolerance of the stationary blade and the sliding contact member is absorbed, and the sliding contact member slides on the blade inner surface as designed, and the designed sliding contact area is obtained. It is important to ensure that self-excited vibration generated in the stationary blade can be suppressed.

Japanese Patent Laid-Open No. 11-336503 JP 2008-133825 A

  The problem to be solved by the present invention is to reliably suppress the self-excited vibration generated in the stationary blade in the stationary blade and the steam turbine of the steam turbine.

  The present invention (the invention according to claim 1) includes a wing member having a space formed therein, a leaf spring member disposed in the space of the wing member and elastically contacting the inner surface of the wing member, A leaf spring member is positioned on the inner surface of the wing member, an elastic contact portion elastically contacting the inner surface of the wing member, and a connecting portion that connects the positioning portion and the elastic contact portion; The leaf spring member is composed of one piece, and the elastic contact portion is divided into a plurality of portions in the longitudinal direction of the wing member.

This invention (the invention according to claim 2 ) is characterized in that the elastic contact portion of the leaf spring member is in elastic contact with the inner surface on the back side of the wing member.

This invention (invention according to claim 3 ) is characterized in that the positioning structure of the inner surface of the wing member and the positioning portion of the leaf spring member is a positioning structure of concave and convex fitting.

This invention (invention according to claim 4 ) is characterized in that a plurality of stationary blades of the steam turbine according to any one of claims 1 to 3 are arranged in the circumferential direction of the rotor shaft. .

  In the stationary blade of the steam turbine according to the present invention (the invention according to claim 1), the elastic contact portion of the leaf spring member is divided into a plurality of portions in the longitudinal direction of the blade member. Can be absorbed. Accordingly, in the stationary blade of the steam turbine according to the present invention (the invention according to claim 1), the elastic contact portion of the leaf spring member divided into a plurality in the longitudinal direction of the blade member comes into contact with the inner surface of the blade member. It is possible to make elastic contact as designed without any problems. As a result, the stationary blade of the steam turbine according to the present invention (the invention according to claim 1) has an elastic contact area as designed, and can reliably suppress self-excited vibration generated in the stationary blade.

  In addition, in the stationary blade of the steam turbine according to the present invention (the invention according to claim 1), the elastic contact portion of the leaf spring member does not come into contact with the inner surface of the blade member, so the spring of the elastic contact portion of the leaf spring member. The reaction force is as designed. As a result, the stationary blade of the steam turbine according to the present invention (the invention according to claim 1) can be easily pressed when the blade member and the leaf spring member are assembled.

  Moreover, in the stationary blade of the steam turbine of the present invention (the invention according to claim 1), the elastic contact portion of the leaf spring member does not come into contact with the inner surface of the blade member. Spring reaction force is as designed. As a result, in the stationary blade of the steam turbine of the present invention (the invention according to claim 1), when the blade member and the leaf spring member are assembled, the surface of the blade member may be deformed due to a single contact. Absent.

  In the stationary blade of the steam turbine of this invention (the invention according to claim 1), since the leaf spring member is composed of one piece, the number of parts does not increase and the blade member and the leaf spring member are assembled. Work becomes easy.

The present invention stator vane of the steam turbine (the invention of claim 1), the longitudinal widen than the elastic contact area of both ends of the longitudinal direction of the central portion of the resilient contact area wing member of the wing members Thus , the self-excited vibration can be effectively suppressed.

In the stationary blade of the steam turbine according to the present invention (the invention according to claim 2 ), the elastic contact portion of the leaf spring member is in elastic contact with the inner surface on the back side wider than the inner surface on the abdominal surface side of the blade member. The elastic contact area between the elastic contact portion of the member and the inner surface on the back side of the wing member can be increased. As a result, the stationary blade of the steam turbine of the present invention (the invention according to claim 2 ) can more reliably suppress the self-excited vibration generated in the stationary blade.

The stationary blade of the steam turbine according to the present invention (the invention according to claim 3 ) positions the inner surface of the blade member and the positioning portion of the leaf spring member by the positioning structure of the concave and convex fitting. Compared with the case of positioning the inner surface of the plate and the positioning portion of the leaf spring member, the welding work can be omitted. As a result, the stationary blade of the steam turbine of the present invention (the invention according to claim 3 ) can shorten the assembly process of the blade member and the leaf spring member by omitting the welding operation, and the manufacturing cost can be reduced. Can be reduced.

In addition, the vane of the steam turbine according to the present invention (the invention according to claim 3 ) is free from welding distortion by omitting the welding operation, and accordingly, the elastic contact portion of the leaf spring member and the inner surface of the blade member. Since the elastic contact area can be increased, the self-excited vibration generated in the stationary blade can be further reliably suppressed. In addition, the vane of the steam turbine of the present invention (the invention according to claim 3 ) can shorten the assembling process and can reduce the manufacturing cost by omitting the welding operation.

The steam turbine of the present invention (the invention according to claim 4), because it uses vanes of the steam turbine according to any one of the claims 1-3, any of the following claims 1-3 The effect similar to that of the stationary blade of the steam turbine described in item 1, that is, the self-excited vibration generated in the stationary blade can be reliably suppressed.

FIG. 1 is a schematic explanatory view of a schematic configuration showing a first embodiment of a steam turbine according to the present invention. FIG. 2 is a partial perspective view of the nozzle box of the steam turbine as seen from the low-pressure final stage side. FIG. 3 is a partial perspective view of the diaphragm of the stationary blade of the steam turbine as seen from the low-pressure final stage side. FIG. 4 is a perspective view showing Embodiment 1 of the stationary blade of the steam turbine according to the present invention. 5 is a cross-sectional view taken along line VV in FIG. FIG. 6 is a perspective view of the leaf spring member as seen from the tip side to the base side. FIG. 7 is a perspective view of the ventral member and the dorsal member as seen from the tip side to the base side. FIG. 8 is also a perspective view seen from the tip side to the base side showing a state in which the leaf spring member is positioned on the abdominal side member. FIG. 9 is also a perspective view seen from the tip side to the base side showing a state in which the back side member is fixed to the positioned abdominal side member and leaf spring member. FIG. 10 is a perspective view of a leaf spring member as viewed from the tip side to the base side, showing a second embodiment of a stationary blade of a steam turbine according to the present invention. FIG. 11: is the perspective view seen from the chip | tip side to the base side of the leaf | plate spring member which shows Embodiment 3 of the stationary blade of the steam turbine concerning this invention. FIG. 12 is a perspective view of a leaf spring member as viewed from the tip side to the base side, showing Embodiment 4 of the stationary blade of the steam turbine according to the present invention. FIG. 13: is the perspective view seen from the chip | tip side to the base side of the leaf | plate spring member which shows Embodiment 5 of the stationary blade of the steam turbine concerning this invention. FIG. 14: is the perspective view seen from the chip | tip side to the base side of the belly side member which shows Embodiment 6 of the stationary blade of the steam turbine concerning this invention.

  Hereinafter, six examples of the embodiments of the stationary blade of the steam turbine according to the present invention and the embodiment of the steam turbine according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment.

[Embodiment 1]
1 to 3 show a first embodiment of a steam turbine according to the present invention. FIGS. 4-9 shows Embodiment 1 of the stationary blade of the steam turbine concerning this invention. Hereinafter, the steam turbine in the first embodiment and the stationary blades of the steam turbine in the first embodiment will be described.

“Description of Steam Turbine 1”
In FIG. 1, reference numeral 1 denotes a steam turbine according to the first embodiment. The steam turbine 1 is used, for example, in a nuclear power plant. The nuclear power plant includes a steam generator 2 that generates high-pressure steam, a high-pressure steam turbine 3 to which high-pressure steam is directly supplied from the steam generator 2, and the steam generator 2 and the high-pressure steam turbine 3. A moisture separator / heater 4 for separating and heating the moisture of the steam, and the low-pressure steam turbine (low-pressure steam turbine) 1 to which low-pressure steam is supplied from the moisture separator / heater 4. is there.

  The steam turbine 1 includes a casing (turbine casing, turbine casing) 5, a rotor shaft (turbine shaft) 6 rotatably attached to the casing 5, and a circumferential direction A of the rotor shaft 6 on the casing 5. A plurality of (multiple) stator blades 7 and a plurality of (many) rotor blades 8 arranged on the rotor shaft 6 in the circumferential direction A of the rotor shaft 6.

  The casing 5 is provided with a steam inlet 9. A steam passage 10 communicating with the steam inlet 9 is provided in the casing 5 in the axial direction B of the rotor shaft 6.

  The base side (the rotor shaft 6 side, the inner side, the inner side in the radial direction C of the rotor shaft 6) of the stationary blades 7 arrayed in a plurality of rings is welded to the shroud (inner ring, inner ring) 11 (FIG. (Not shown). Further, the tip side (the casing 5 side, the outer side, the outer side in the radial direction C of the rotor shaft 6) of the stationary blade 7 group arranged in a plurality of circular rings is connected to a blade root ring (outer ring, outer ring) 12. They are connected by welding 13. The blade root ring 12 is fixed to the casing 5. A space 14 is formed inside the stationary blade 7. A slit 15 (see FIGS. 4 and 5) is provided on the side of the abdominal surface 20 (see FIGS. 4, 5, and 7) of the stationary blade 7 so as to communicate with the space 14. An opening 16 (see FIG. 3) is provided in the shroud 11 so as to communicate with the space 14.

  The base side of the group of moving blades 8 arranged in a plurality of rings is fixed to the rotor shaft 6. The tip side of the plurality of moving blades 8 arranged in a plurality of circular rings faces the casing 5.

  The group of stationary blades 7 arranged in a plurality of annular rings and the group of moving blades 8 arranged in a plurality of annular rings similarly constitute one stage as a pair. The steam turbine 1 is provided with a plurality of stages of the stationary blade 7 group and the moving blade 8 group. The blade width of the stationary blade 7 and the moving blade 8 (the radial direction C of the rotor shaft 6, that is, the length of the blade in a direction substantially perpendicular to the axial direction B of the rotor shaft 6), passes through the steam passage 10. It is comprised so that it may become long as it goes to a downstream side from an upstream side. The stage located on the most downstream side of the steam passage 10 is referred to as a low-pressure final stage. The blade width of the stationary blade 7 and the moving blade 8 in the low-pressure final stage is the longest among the blade widths of the stationary blade 7 and the moving blade 8 in the other stages.

  Hereinafter, the operation of the steam turbine 1 having the above-described configuration will be described. The steam supplied from the moisture separator / heater 4 to the steam inlet 9 flows along the axial direction B of the rotor shaft 6 through the steam passage 10. At this time, kinetic energy is generated by a pressure drop in the stationary blade 7 group, and this kinetic energy is converted into rotational torque by the moving blade 8 group. As a result, the rotor shaft 6 is rotationally driven to generate power.

  Water (steam, water droplets) adhering to the abdominal surface 20 (surface) of the stationary blade 7 moves on the abdominal surface 20 in response to the vapor pressure, as shown in a broken line arrow direction D in FIG. 15 flows into the space 14. The water that has flowed into the space 14 flows toward the shroud 11 in the radial direction C of the rotor shaft 6, and flows out (discharges) from the opening 16 to the outside as indicated by a solid arrow direction E in FIG. .

“Description of configuration of stationary blade 7”
Hereinafter, the configuration of the stationary blade 7 of the steam turbine 1 according to the first embodiment will be described. The stationary blade 7 includes a ventral member 17 (see FIG. 7A), a back member 18 (see FIG. 7B), and a leaf spring member 19 (see FIG. 6). .

  As shown in the profile of FIG. 7A, the ventral member 17 is formed by pressing a sheet metal. The ventral member 17 is provided with the slit 15. The back member 18 is formed by pressing a sheet metal, as shown in the profile of FIG. As shown in FIG. 6, the plate spring member 19 is formed by pressing a sheet metal (spring steel). The abdominal member 17, the back member 18, and the leaf spring member 19 form a three-dimensional curved surface.

  As shown in FIG. 5, in the cross-sectional shape of the rotor shaft 6 in the axial direction B, the abdominal member 17 is curved so as to protrude from the abdominal surface 20 that is the outer surface toward the inner surface 21. The back member 18 is curved so as to protrude from the inner surface 22 toward the rear surface 23 side, which is the outer surface. The curve (warp) of the ventral member 17 and the curve (warp) of the dorsal member 18 are different. As a result, the front edge 24 of the abdominal member 17 and the front edge 24 of the dorsal member 18, and the rear edge 25 of the abdominal member 17 and the rear edge 25 of the dorsal member 18. Are fixed by welding 26. Then, the space 14 is formed inside the wing member composed of the ventral member 17 and the back member 18.

  The leaf spring member 19 includes a positioning portion 27, an elastic contact portion 28, and a connecting portion 29. The leaf spring member 19 is composed of one piece in this example. The positioning portion 27 is provided in the longitudinal direction (the radial direction C of the rotor shaft 6) of the wing members 17 and 18 (the abdominal member 17 and the dorsal member 18) in the central portion of the leaf spring member 19. It has been. The elastic contact portion 28 is provided in the longitudinal direction of the wing members 17 and 18 on the left and right side portions of the leaf spring member 19. The connecting portion 29 is provided between the positioning portion 27 at the center and the elastic contact portions 28 on both the left and right sides, and connects the positioning portion 27 and the elastic contact portion 28. A plurality of the elastic contact portions 28 and the connecting portions 29 are formed in the longitudinal direction of the wing members 17, 18, for example, by leather processing or the like, and in this example, approximately nine (ie, the elastic contact portions 28 and 28). It is divided so that the contact area with the inner surface 22 of the back member 18 is substantially equal. The width of the groove 32 (the length in the longitudinal direction of the wing members 17 and 18) dividing the elastic contact portion 28 and the connecting portion 29 into a plurality (nine) is substantially the same.

  Hereinafter, an assembly process of the stationary blade 7 including the abdominal member 17, the back member 18, and the leaf spring member 19 will be described.

  First, as shown in FIG. 7A, FIG. 7B, and FIG. 6, the abdominal member 17, the back member 18, and the leaf spring member 19 are formed by pressing. Next, as shown in FIG. 8, the positioning portion 27 of the leaf spring member 19 is placed on the inner surface 21 of the ventral member 17. The inner surface 21 of the ventral member 17 and the positioning portion 27 of the leaf spring member 19 are positioned by welding (spot welding or plug welding) 30.

  Then, the inner surface 22 of the back member 18 is placed on the elastic contact portion 28 of the positioned leaf spring member 19. At this time, the back side member 18 side of the elastic contact portion 28 (see the solid line in FIG. 5) after the elastic contact portion 28 (see the two-dot chain line in FIG. 5) before elastic deformation is elastically deformed. Therefore, the inner surface 22 of the back member 18 is in contact with the left and right ends of the elastic contact portion 28 of the leaf spring member 19.

  Then, as shown in FIG. 9, the back side member 18 is pressed against the abdominal side member 17 side, and the elastic contact portion 28 of the leaf spring member 19 is changed from the state of the two-dot chain line in FIG. It is elastically deformed to the state of the solid line. At this time, since the inner surface 21 of the ventral member 17 and the positioning portion 27 of the leaf spring member 19 are positioned by welding 30, the relative positions of the ventral member 17 and the leaf spring member 19 are shifted. There is no such thing.

  In this state, the front edge 24 of the ventral member 17 and the front edge 24 of the dorsal member 18, and the rear edge 25 of the ventral member 17 and the rear edge of the dorsal member 18 25 are fixed by welding 26 respectively. As a result, as shown in FIG. 5, the leaf spring member 19 is disposed in the space 14 of the wing members 17 and 18. The elastic contact portion 28 is in elastic contact with the inner surfaces 21 and 22 of the wing members 17 and 18, in this example, the inner surface 22 of the back member 18.

“Description of the action of the stationary blade 7”
The stationary blade of the steam turbine in the first embodiment is configured as described above, and the operation thereof will be described below.

  During the operation of the steam turbine 1, the ventral member 17 and the back member 18 of the stationary blade 7 are elastically deformed. Then, friction is generated between the inner surface 22 of the back member 18 and the elastic contact portion 28 of the leaf spring member 19. This friction attenuates elastic deformation of the ventral member 17 and the back member 18 of the stationary blade 7. As a result, the self-excited vibration generated in the stationary blade 7 is suppressed.

“Explanation of effects of steam turbine 1 and stationary blade 7”
The steam turbine 1 according to the first embodiment and the stationary blade 7 of the steam turbine according to the first embodiment are configured and operated as described above, and the effects thereof will be described below.

  The steam turbine 1 according to the first embodiment and the stationary blade 7 of the steam turbine according to the first embodiment include a plurality of elastic contact portions 28 and connecting portions 29 of the leaf spring member 19 in the longitudinal direction of the blade members 17 and 18. Then, since it is divided into nine parts, manufacturing tolerances of the blade members 17 and 18 and the leaf spring member 19 can be absorbed. Accordingly, the steam turbine 1 according to the first embodiment and the stationary blades 7 of the steam turbine according to the first embodiment are divided into a plurality of, in this example, nine leaf springs in the longitudinal direction of the blade members 17 and 18. The elastic contact portion 28 of the member 19 can be elastically contacted as designed without contacting the inner surfaces 21 and 22 of the wing members 17 and 18, in this example, the inner surface 22 of the back member 18. As a result, the steam turbine 1 according to the first embodiment and the stationary blade 7 of the steam turbine according to the first embodiment have an elastic contact area as designed, and reliably suppress self-excited vibration generated in the stationary blade 7. Can do.

  Here, in the steam turbine 1 in the first embodiment and the stationary blade 7 of the steam turbine in the first embodiment, the elastic contact portion 28 of the leaf spring member 19 is divided into a plurality (9 pieces) by the grooves 32. Although the area of the elastic contact portion 28 itself is somewhat reduced, the elastic contact portion 28 divided into a plurality (nine) is in elastic contact with the inner surface 22 of the back member 18 over almost the entire surface, so it was not divided. Compared to the conventional structure in which the elastic contact portion is partially elastically contacted with the inner surface 22 of the back side member 18, the elastic contact portion 28 is divided into a plurality (nine) and the inner surface of the back side member 18. The elastic contact area with 22 is wider than the elastic contact area between the elastic contact portion of the conventional structure that is not divided and the inner surface 22 of the back member 18.

  Moreover, the steam turbine 1 according to the first embodiment and the stationary blade 7 of the steam turbine according to the first embodiment are configured so that the elastic contact portion 28 of the leaf spring member 19 has the inner surfaces 21 and 22 of the blade members 17 and 18, in this example, the back. Since the inner surface 22 of the side member 18 does not hit one side, the spring reaction force of the elastic contact portion 28 of the leaf spring member 19 is as designed. As a result, the steam turbine 1 according to the first embodiment and the stationary blade 7 of the steam turbine according to the first embodiment can be easily pressed when the blade members 17 and 18 and the leaf spring member 19 are assembled.

  In addition, the steam turbine 1 according to the first embodiment and the stationary blade 7 of the steam turbine according to the first embodiment are configured so that the elastic contact portion 28 of the leaf spring member 19 has the inner surfaces 21 and 22 of the blade members 17 and 18, in this example, Since the inner surface 22 of the back member 18 does not come into contact with each other, the spring reaction force of the elastic contact portion 28 of the leaf spring member 19 is as designed. As a result, the steam turbine 1 according to the first embodiment and the stationary blade 7 of the steam turbine according to the first embodiment, when the blade members 17 and 18 and the leaf spring member 19 are assembled, the blade members 17 and 18 that come into contact with each other. No surface deformation will occur.

  In the steam turbine 1 in the first embodiment and the stationary blade 7 of the steam turbine in the first embodiment, the leaf spring member 19 is composed of one piece, so that the number of parts does not increase and the blade member 17, Assembling work between the leaf spring member 19 and the leaf spring member 19 is facilitated.

  In the steam turbine 1 according to the first embodiment and the stationary blade 7 of the steam turbine according to the first embodiment, the elastic contact portion 28 of the leaf spring member 19 is formed on the inner surface 22 of the back member 18 wider than the inner surface 21 of the ventral member 17. Since it is in elastic contact, the elastic contact area between the elastic contact portion 28 of the leaf spring member 19 and the inner surface 22 of the back side member 18 can be increased. As a result, the steam turbine 1 in the first embodiment and the stationary blade 7 of the steam turbine in the first embodiment can more reliably suppress the self-excited vibration generated in the stationary blade 7.

[Embodiment 2]
FIG. 10 shows Embodiment 2 of the stationary blade of the steam turbine according to the present invention. Hereinafter, the stationary blade of the steam turbine in this Embodiment 2 is demonstrated. In the figure, the same reference numerals as those in FIGS. 1 to 9 denote the same components.

  In the stationary blade 7 of the steam turbine in the first embodiment, the leaf spring member 19 is composed of one piece. On the other hand, as shown in FIG. 10, the stationary blade 7 of the steam turbine according to the second embodiment includes a plurality of leaf spring members 190 in the longitudinal direction of the blade members 17 and 18, in this example, nine pieces. (I.e., the contact area between the elastic contact portion 28 and the inner surface 22 of the back side member 18 is substantially equal). That is, a plurality (9 pieces) of the positioning portions 27 are divided by the grooves 32 together with the elastic contact portions 28 and the connecting portions 29 of the leaf spring member 190.

  Since the stationary blade 7 of the steam turbine in the second embodiment is configured as described above, it is possible to achieve substantially the same operational effect as the stationary blade 7 of the steam turbine in the first embodiment.

  In particular, the stationary blade 7 of the steam turbine according to the second embodiment is divided into a plurality of leaf spring members 190 in the longitudinal direction of the blade members 17 and 18, in this example, nine pieces. Compared with the leaf spring member 19, the degree of freedom is increased, and accordingly, the shape of the wing members 17, 18 and the absorbability (followability) with respect to production intersection (production variation) are improved, and the designed elastic contact area is achieved. It can be ensured easily and reliably.

[Embodiment 3]
FIGS. 11A and 11B show a third embodiment of a stationary blade of a steam turbine according to the present invention. Hereinafter, the stationary blade of the steam turbine in this Embodiment 3 is demonstrated. In the figure, the same reference numerals as those in FIGS. 1 to 10 denote the same components.

  In the steam turbine stationary blade 7 according to the first and second embodiments, the leaf springs 19 and 190 are divided into a plurality (nine) by the grooves 32 having substantially the same width, and the plurality (nine) is divided. The contact areas of the elastic contact portions 28 of the leaf spring members 19 and 190 and the inner surface 22 of the back member 18 are substantially equal (the contact area of the elastic contact portion 28 on the chip side is the same as that of the other elastic contact portions 28). Slightly different from the contact area). On the other hand, as shown in FIGS. 11A and 11B, the stationary blade 7 of the steam turbine according to the third embodiment has an elastic contact portion 28 on the central side in the longitudinal direction of the blade members 17 and 18. The elastic contact area with the inner surface 22 of the back side member 18 is such that the elastic contact portion 28 on both ends (tip side and base side) in the longitudinal direction of the wing members 17, 18 and the inner surface 22 of the back side member 18 are in elastic contact. It is configured to be wider than the area. The width of the groove 33 dividing the elastic contact portion 28 and the connecting portion 29, or the positioning portion 27, the elastic contact portion 28 and the connecting portion 29 into a plurality (9) (the longitudinal direction of the wing members 17 and 18). ), The width of the groove 33 on the central side in the longitudinal direction of the wing members 17, 18 is narrower than the width of the groove 33 on both ends in the longitudinal direction of the wing members 17, 18. The leaf spring member 191 shown in FIG. 11A is composed of one piece, like the stationary blade 7 of the steam turbine in the first embodiment. The leaf spring member 192 shown in FIG. 11 (B) is composed of a plurality (9 pieces) of pieces as in the case of the stationary blade 7 of the steam turbine in the second embodiment.

  Since the stationary blade 7 of the steam turbine in the third embodiment is configured as described above, it is possible to achieve substantially the same operational effect as the stationary blade 7 of the steam turbine in the first and second embodiments.

  In particular, the stationary blade 7 of the steam turbine according to the third embodiment has an elastic contact area between the elastic contact portion 28 on the center side in the longitudinal direction of the blade members 17 and 18 and the inner surface 22 of the back side member 18. Since it is larger than the elastic contact area of the elastic contact part 28 of the both ends of 18 in the longitudinal direction and the inner surface 22 of the back side member 18, the self-excited vibration can be effectively suppressed. Here, it is effective (effective) to dispose the leaf spring member at a place having a large amplitude with respect to the target vibration mode (for example, a vibration mode assuming a bending mode with both ends fixed). For this reason, self-excited vibration can be effectively suppressed by expanding the elastic contact area of the central portion having a large amplitude.

[Embodiment 4]
12A and 12B show a fourth embodiment of a stationary blade of a steam turbine according to the present invention. Hereinafter, the stationary blade of the steam turbine in this Embodiment 4 is demonstrated. In the figure, the same reference numerals as those in FIGS. 1 to 11 denote the same components.

  In the stationary blade 7 of the steam turbine according to the third embodiment, the width of the groove 33 on the center side in the longitudinal direction of the blade members 17 and 18 is larger than the width of the groove 33 on both ends in the longitudinal direction of the blade members 17 and 18. The leaf springs 191 and 192 are divided into a plurality (9 pieces) by the narrow groove 33, and the elastic contact portions 28 of the leaf spring members 191 and 192 and the back side member 18 are divided into the plurality (9 pieces). In the contact area with the inner surface 22, the elastic contact area between the elastic contact portion 28 on the center side in the longitudinal direction of the wing members 17, 18 and the inner surface 22 of the back side member 18 corresponds to both ends in the longitudinal direction of the wing members 17, 18. The elastic contact portion 28 is configured to be wider than the elastic contact area between the elastic contact portion 28 on the portion side and the inner surface 22 of the back side member 18. On the other hand, as shown in FIGS. 12A and 12B, the stationary blade 7 of the steam turbine according to the fourth embodiment includes a plurality of leaf springs 193 and 194 (9) by grooves 32 having substantially the same width. In the contact area between the elastic contact portions 28 of the leaf spring members 193 and 194 and the inner surface 22 of the back member 18 divided into a plurality (9 pieces) of the blade members 17 and 18, The elastic contact area between the elastic contact portion 28 on the center side in the direction and the inner surface 22 of the back member 18 is such that the elastic contact portion 28 on both ends in the longitudinal direction of the wing members 17, 18 and the inner surface 22 of the back member 18. It is comprised so that it may become larger than the elastic contact area. The leaf spring member 193 shown in FIG. 12A is one piece, similar to the stationary blade 7 of the steam turbine in the first embodiment and the stationary blade 7 of the steam turbine in the third embodiment shown in FIG. It is composed of A plurality of leaf spring members 194 shown in FIG. 12B are the same as the stationary blade 7 of the steam turbine in the second embodiment and the stationary blade 7 of the steam turbine in the third embodiment shown in FIG. 11B. It is composed of (9 pieces).

  Since the stationary blade 7 of the steam turbine in the fourth embodiment is configured as described above, it is possible to achieve substantially the same operational effect as the stationary blade 7 of the steam turbine in the first, second, and third embodiments.

[Embodiment 5]
FIGS. 13A and 13B show a fifth embodiment of a stationary blade of a steam turbine according to the present invention. Hereinafter, the stationary blade of the steam turbine in this Embodiment 5 is demonstrated. In the figure, the same reference numerals as those in FIGS. 1 to 12 denote the same components.

  In the steam turbine stationary blade 7 according to the first, second, third, and fourth embodiments, the elastic contact portion 28 and the connecting portion 29 of the one-piece leaf spring members 19, 191, and 193 are divided into a plurality (9 pieces). Further, the positioning portion 27, the elastic contact portion 28, and the connecting portion 29 of the leaf spring members 190, 192, 194 are divided into a plurality (nine) pieces. On the other hand, as shown in FIG. 13A, the stationary blade 7 of the steam turbine according to the fifth embodiment has a width of the groove 33 on the central portion side in the longitudinal direction of the blade members 17 and 18. The leaf spring 195 is divided into a plurality of (three) pieces by a groove 33 that is narrower than the width of the groove 33 on both end portions 18 in the longitudinal direction. The elastic contact portion 28 and the connecting portion 29 are each divided into a plurality (three). Further, as shown in FIG. 13B, the stationary blade 7 of the steam turbine in the fifth embodiment divides the leaf spring 196 into a plurality of (three) pieces by a groove 32 having substantially the same width, And the elastic contact part 28 and the connection part 29 of the leaf | plate spring 196 of several pieces (three pieces) are each divided | segmented into multiple pieces (three pieces or four pieces).

  Since the stationary blade 7 of the steam turbine in the fifth embodiment is configured as described above, it is possible to achieve substantially the same operational effect as the stationary blade 7 of the steam turbine in the first, second, third, and fourth embodiments. .

[Embodiment 6]
FIG. 14 shows a sixth embodiment of a stationary blade of a steam turbine according to the present invention. Hereinafter, the stationary blade of the steam turbine in this Embodiment 6 is demonstrated. In the figure, the same reference numerals as those in FIGS. 1 to 13 denote the same components.

  The stationary blade 7 of the steam turbine in the first, second, third, fourth, and fifth embodiments positions the leaf spring members 19 to 196 on the inner surface 21 of the ventral member 170 by welding 30. On the other hand, the stationary blade 7 of the steam turbine according to the sixth embodiment has a positioning structure in which the positioning structure between the inner surface 21 of the abdominal member 170 and the positioning portion 27 of the leaf spring members 19 to 196 is an uneven fitting. It is. That is, the positioning concave portion 31 is provided in the inner surface 21 of the abdominal member 170 at a position where the positioning portion 27 of the leaf spring members 19 to 196 is positioned. Moreover, let the positioning part 27 of the leaf | plate spring members 19-196 be a positioning convex part. By fitting the positioning portion 27 as the positioning convex portion of the leaf spring members 19 to 196 into the positioning recess 31 of the inner surface 21 of the ventral member 170, the relative positions of the leaf spring members 19 to 196 and the ventral member 170 are determined. It is done. Here, when assembling the leaf spring members 19 to 196 with the abdominal member 170 and the back member 18 (wing member), the abdominal member 170 and the dorsal member 18 with the leaf spring members 19 to 196 elastically deformed. Therefore, the leaf spring members 19 to 196 are not likely to be displaced with respect to the ventral member 170 and the dorsal member 18.

  Since the stationary blade 7 of the steam turbine in the sixth embodiment is configured as described above, it achieves substantially the same effect as the stationary blade 7 of the steam turbine in the first, second, third, fourth, and fifth embodiments. Can do.

  In particular, the steam turbine stationary blade 7 of the sixth embodiment has no welding distortion by omitting the welding operation, and accordingly, the elastic contact portion 28 of the leaf spring members 19 to 196 and the inner surface 22 of the back side member 18. As a result, the self-excited vibration generated in the stationary blade 7 can be more reliably suppressed.

  Moreover, the stationary blade 7 of the steam turbine in the sixth embodiment can shorten the assembly process by omitting the welding operation, and can reduce the manufacturing cost.

“Description of Examples Other than Embodiments 1, 2, 3, 4, 5, 6”
In the first to sixth embodiments, the elastic contact portions 28 of the leaf spring members 19 to 196 are in elastic contact with the inner surface 22 of the back side member 18. However, in the present invention, the elastic contact portion of the leaf spring member makes elastic contact with the inner surface of the abdominal member, or the elastic contact portion of the leaf spring member elastically acts on both the inner surface of the abdominal member and the inner surface of the back member. You may touch.

DESCRIPTION OF SYMBOLS 1 Steam turbine 2 Steam generator 3 High pressure steam turbine 4 Moisture separation heater 5 Casing 6 Rotor shaft 7 Stator blade 8 Moving blade 9 Steam inlet 10 Steam passage 11 Shroud 12 Blade root ring 13 Welding 14 Space 15 Slit 16 Opening 17, 170 Ventral member (wing member)
18 Back member (wing member)
19, 190, 191, 192, 193, 194, 195, 196 Leaf spring member 20 Abdominal surface 21 Inner surface 22 Inner surface 23 Back surface 24 Front edge portion 25 Rear edge portion 26 Welding 27 Positioning portion 28 Elastic contact portion 29 Connecting portion 30 Welding (positioning) Part)
31 Positioning recess 32 Groove 33 Groove A A circumferential direction of the rotor shaft B Axial direction of the rotor shaft C Radial direction of the rotor shaft D Water inflow direction E Water outflow direction

Claims (4)

In the stationary blade of the steam turbine,
A wing member in which a space is formed,
A leaf spring member disposed in the space of the wing member and elastically contacting the inner surface of the wing member;
With
The leaf spring member includes a positioning portion that is positioned on the inner surface of the wing member, an elastic contact portion that is in elastic contact with the inner surface of the wing member, and a connecting portion that connects the positioning portion and the elastic contact portion. And consists of
The leaf spring member is composed of one piece,
The elastic contact portion is divided into a plurality in the longitudinal direction of the wing member,
A vane of a steam turbine characterized by that. The elastic contact portion of the leaf spring member is in elastic contact with the inner surface on the back side of the wing member,
The stationary blade of the steam turbine according to claim 1 . The positioning structure of the inner surface of the wing member and the positioning portion of the leaf spring member consists of a positioning structure for concave and convex fitting.
The stationary blade of the steam turbine according to claim 1 or 2 , characterized by the above-mentioned. In the steam turbine,
A plurality of stator blades of the steam turbine according to any one of claims 1 to 3 are arranged in a circumferential direction of the rotor shaft.
A steam turbine characterized by that.

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