JP6944314B2 - How to make steam turbine blades, steam turbine blades, and steam turbines - Google Patents

Description

The present invention relates to a method for manufacturing a steam turbine blade, a steam turbine blade, and a steam turbine.

The steam turbine is used for driving a machine or the like, and has a rotor that is rotatably supported and a casing that covers the rotor. The steam turbine is rotationally driven by supplying steam as a working fluid to the rotor. In a steam turbine, a rotor blade is provided on the rotor, and a stationary blade is provided on a casing covering the rotor. In the steam flow path of the steam turbine, moving blades and stationary blades are alternately arranged in a plurality of stages. When steam flows through the steam flow path, the steam flow is rectified by the stationary blades, and the rotor is rotationally driven via the moving blades.

In a steam turbine, the pressure becomes very low as it approaches its final stage. Therefore, the circulating steam eventually reaches the saturated vapor pressure, and is in a wet steam state containing liquefied fine water droplets (water droplet nuclei). Most of these fine water droplets (drains) pass between the blade rows together with steam, but some of them adhere to the blade surface due to inertia to form a liquid film on the blade surface. After moving to the trailing edge of the wing, the liquid film scatters into the vapor stream again and becomes coarse water droplets. It is known that these coarse water droplets collide with the moving blade at a large relative velocity to generate erosion on the surface of the moving blade.

Patent Document 1 describes a stationary blade in which a ventral slit is formed on the ventral wing surface and a dorsal slit is formed on the dorsal wing surface. In this stationary wing, two independent hollow cavities are formed inside the stationary wing, which penetrate from the inner shroud to the outer shroud. The ventral slit and the dorsal slit communicate with each other in a separate hollow cavity. As a result, the recovered drain is suppressed from re-flowing to the blade surface, and the drain recovery efficiency is improved.

In the stationary blade described in Patent Document 1, it is necessary to form two independent hollow cavities inside. When the stationary blade itself is formed by casting, the hollow cavity is formed at the same time as the blade surface using a core or the like, or is formed by post-processing using a drill or the like. Even when a stationary blade is formed by cutting from a plate material, it is formed by post-processing using a drill or the like.

Japanese Unexamined Patent Publication No. 11-336503

However, when the shape of the blade surface of the stationary blade is complicated, the shape of the cavity formed inside is also complicated, and it is difficult to form a space for collecting drain inside the blade body by the core. Further, it is difficult to form an internal hollow portion by post-processing in a region having a thin plate thickness such as a trailing edge of a stationary blade. Therefore, it is desired to reduce the processing difficulty when forming a space for collecting the drain inside the wing body.

The present invention has been made in order to meet the above demands, and is a method for manufacturing a steam turbine blade capable of easily forming a space for collecting drain inside a blade body, a steam turbine blade, and a steam turbine blade. The purpose is to provide a steam turbine.

In order to solve the above problems, the present invention proposes the following means.
The method for manufacturing a steam turbine blade according to the first aspect of the present invention includes a first drain flow path extending in the blade height direction inside a blade body having a blade surface extending in the blade height direction, and the blade body. A second drain flow path extending in the blade height direction on the front edge side of the blade body from the first drain flow path inside the blade, and a first suction port and a first suction port opened on the blade surface. (2) It has a suction port, a first series passage for communicating the first suction port and the first drain flow path, and a second series passage for communicating the second suction port and the second drain flow path. A preparatory step for manufacturing a steam turbine blade, in which a back plate material capable of forming a convex back surface as the blade surface and a ventral plate material capable of forming a concave ventral side surface as the blade surface are prepared. And the processing step of processing the back side plate material and the ventral plate material, and forming the first drain flow path and the second drain flow path between the back side plate material and the ventral plate material. The processing step includes a joining step of joining the back side plate material and the ventral side plate material, and the processing step includes a removal step of scraping and removing the back side plate material and a part of the ventral side plate material, and the back side plate material and the back side plate material. In the removing step, which includes a bending step of bending the ventral plate material, a first drain flow path forming surface for forming the first drain flow path and a second drain flow path forming for forming the second drain flow path are formed. A surface is formed on both the dorsal plate material and the ventral plate material, and in the bending step, the dorsal side surface is formed on the dorsal plate material, the ventral side surface is formed on the ventral plate material, and the joint is formed. In the step, the back side plate material and the ventral side plate material are joined between the second drain flow path forming surface and the first drain flow path forming surface, and the second drain flow path and the first drain flow flow. A partition portion is formed by the above-mentioned joint that partitions the road so as to be independent of each other.

According to such a configuration, by processing the flat plate-shaped dorsal plate material and ventral plate material in advance, the processing can be performed without being affected by the final shape of the wing body. Therefore, the first drain flow path forming surface and the second drain flow path forming surface can be formed only by processing a flat plate-shaped dorsal side plate material or ventral side plate material. As a result, the processing of the first drain flow path forming surface and the second drain flow path forming surface becomes easy. Further, the first drain flow path and the second drain flow path are formed by the first drain flow path forming surface and the second drain flow path forming surface. Therefore, even if the final shape of the wing body is a shape that is difficult to process inside, such as when the wing body is thin or the wing surface is formed by a complicated three-dimensional curved surface, the first The drain flow path and the second drain flow path can be easily formed inside the blade body. Further, it is not necessary to newly prepare another member other than the dorsal plate material and the ventral plate material in order to form the first drain flow path. As a result, the number of parts forming the blade body can be reduced, and the manufacturing cost of the blade body can be reduced.

Further, in the method for manufacturing a steam turbine blade according to the second aspect of the present invention, in the first aspect, in the removal step, when the back side plate material and the ventral side plate material are joined, the back side plate material is used. Kubo said dorsal plate inner side surface located on the ventral side plate side from the dorsal surface, and, from at least one of the ventral plate inner side surface located on the back side plate side than the ventral aspect at the ventral plate in As such, the first drain flow path forming surface may be formed.

According to such a configuration, by forming the first drain flow path forming surface so as to be recessed from at least one of the dorsal plate material and the ventral plate material, the plate thickness of the dorsal plate material and the ventral plate material is not increased. The first drain flow path can be made larger.

Further, in the method for manufacturing a steam turbine blade in the third aspect of the present invention, in the first or second aspect, in the removal step, when the back side plate material and the ventral side plate material are joined, the said dorsal plate in side than the back side surface of the back side plate located on the ventral side plate side, and, at least in the ventral plate inner side surface located on the back side plate side than the ventral aspect at the ventral plate The first series passage forming surface forming the first series passage may be formed so as to be recessed from one side.

According to such a configuration, the first series passage forming surface can be formed only by processing the surface of the flat plate-shaped dorsal plate material or ventral plate material. Therefore, the processing of the first series passage forming surface becomes easy. In addition, the first series of passages is formed between the dorsal side plate material and the ventral side plate material by the first series passage forming surface. Therefore, the first series passage can be easily formed inside the wing body.

Further, in the method for manufacturing a steam turbine blade according to the fourth aspect of the present invention, in any one of the first to third aspects, in the removal step, the first suction port is formed to form the first suction port. As a surface, when the dorsal plate material is joined to the ventral plate material, a first suction port dorsal side forming surface that is recessed from the inner side surface of the dorsal plate material located on the ventral side plate material side with respect to the dorsal side surface is formed. In the joining step, the back side plate material and the ventral side are formed so as to form the first suction port between the back side forming surface of the first suction port and the end surface on the trailing edge side of the ventral plate material. The plate material may be joined.

Further, in the method for manufacturing a steam turbine blade according to the fifth aspect of the present invention, in any one of the first to fourth aspects, the back side plate material and the ventral side plate material are joined in the removal step. In the case of the dorsal side plate material, the inner side surface of the dorsal side plate material located closer to the ventral side plate material than the dorsal side surface, and the ventral side of the ventral side plate material located closer to the dorsal side plate material side than the ventral side surface. The second drain flow path forming surface may be formed so as to be recessed from at least one of the inner side surfaces of the plate material.

Further, in the method for manufacturing a steam turbine blade according to the sixth aspect of the present invention, in any one of the first to fifth aspects, the back side plate material and the ventral side plate material are joined in the removal step. when that the dorsal plate inner side surface located on the ventral side plate side from the back side surface of the back side sheet, and ventral located on the back side plate side than the ventral aspect at the ventral plate The second passage forming surface forming the second passage may be formed so as to be recessed from at least one of the inner side surfaces of the plate material.

Further, in the method for manufacturing a steam turbine blade according to the seventh aspect of the present invention, in any one of the first to sixth aspects, in the removal step, the second suction port is formed to form the second suction port. As a surface, when the ventral plate material is joined to the dorsal plate material, a second suction port ventral side forming surface recessed from the inner side surface of the ventral plate material located on the dorsal side plate material side with respect to the ventral side surface is formed. In the joining step, the ventral plate material and the back plate material are formed so as to form the second suction port between the ventral surface of the second suction port and the end surface of the back plate material on the front edge side. May be joined.

Further, in the method for manufacturing a steam turbine blade according to the eighth aspect of the present invention, in any one of the first to third aspects, in the bending step, the second drain is performed together with the dorsal side surface and the ventral side surface. A flow path forming surface may be formed.

According to such a configuration, it is not necessary to newly prepare another member other than the dorsal side plate material and the ventral side plate material in order to form the second drain flow path. As a result, the number of parts forming the blade body can be reduced, and the manufacturing cost of the blade body can be reduced.

Further, the steam turbine blade according to the ninth aspect of the present invention includes a blade body having a blade surface extending in the blade height direction, and the blade body forms a convex dorsal side surface as the blade surface. The side plate material, the ventral plate material forming a concave ventral side surface as the wing surface, a plurality of joint portions for joining the back side plate material and the ventral plate material, the back side plate material and the said The first drain flow path extending in the blade height direction between the ventral plate material and the first drain flow path extending in the blade height direction between the back side plate material and the ventral plate material. The second drain flow path formed on the front edge side of the blade body, the first suction port and the second suction port opened on the blade surface, the first suction port and the first suction port. A first series of passages that communicate with the drain flow path, a second communication passage that communicates the second suction port and the second drain flow path, and the second drain flow path and the first drain. It has a partition portion that partitions the flow path inside the blade body so as to be independent of each other, and one of the joint portions forms the partition portion by the joint.

According to such a configuration, the first drain flow path and the second drain flow path are independent of each other at the partition portion, so that the first suction port and the second suction port communicate with each other inside the blade body. It is possible to prevent it from being lost. As a result, it is possible to prevent the drain collected through the first suction port from flowing out from the second suction port formed on the back side surface having low pressure through the inside of the wing body. In addition, even if the wing body has a shape that is difficult to process, the two plates are processed in advance and then joined so as to form a partition, so that the inside of the wing body is oriented in the blade height direction. The two extending spaces can be easily formed independently. Therefore, the first drain flow path and the second drain flow path can be formed while suppressing the influence of the processing difficulty due to the final shape of the blade body.

Further, in the steam turbine blade according to the tenth aspect of the present invention, in the ninth aspect, the first suction port may be formed on the concave ventral side surface of the blade surface.

According to such a configuration, the drain adhering to the ventral side surface can be recovered.

Further, in the steam turbine blade according to the eleventh aspect of the present invention, in the ninth or tenth aspect, the first drain flow path is located on the ventral plate side of the dorsal plate material with respect to the dorsal side surface. The back side plate material is formed by the first drain flow path forming surface formed on the inner side surface of the back side plate material and the inner side surface of the ventral side plate material located on the back side plate material side of the ventral side surface. The first drain flow path forming surface formed between the ventral plate material and the ventral plate material may be formed by being recessed from at least one of the inner side surface of the back side plate material and the inner side surface of the ventral plate material.

According to such a configuration, by forming the first drain flow path forming surface so as to be recessed from at least one of the dorsal plate material and the ventral plate material, the plate thickness of the dorsal plate material and the ventral plate material is not increased. The first drain flow path can be made larger.

Further, in the steam turbine blade according to the twelfth aspect of the present invention, in any one of the ninth to eleventh aspects, the first series passage is the antinode of the back side plate material rather than the back side surface. The first series of passage forming surfaces formed on the inner side surface of the back side plate material located on the side plate material side and the inner side surface of the ventral side plate material located on the back side plate material side of the ventral side plate material, respectively. The first series passage forming surface may be formed between the back side plate material and the ventral plate material, and may be formed by being recessed from at least one of the inner side surface of the back side plate material and the inner side surface of the ventral side plate material.

According to such a configuration, the first series passage forming surface can be formed only by processing the surface of the flat plate-shaped dorsal plate material or ventral plate material. Therefore, the processing of the first series passage forming surface becomes easy. In addition, the first series of passages is formed between the dorsal side plate material and the ventral side plate material by the first series passage forming surface. Therefore, the first series passage can be easily formed inside the wing body.

Further, in the steam turbine blade according to the thirteenth aspect of the present invention, in any one of the ninth to twelfth aspects, the first suction port extends in the blade height direction at the blade surface. In the dorsal plate material, the first suction port dorsal side forming surface that opens and is recessed from the inner side surface of the dorsal plate material located on the ventral side plate material side with respect to the dorsal side surface, and the trailing edge side of the ventral plate material. The first series passages are formed by the end faces, and a plurality of the first series passages are formed apart from each other in the blade height direction, and the first suction port and the first drain flow path are communicated with each other in an independent state. You may.

According to such a configuration, even if there is a pressure difference around the blade surface in the blade height direction in which the first suction port extends, the drain in the first series passage is in the blade height direction according to the pressure difference. It is possible to suppress the movement to. As a result, it is possible to prevent the drain once drawn into the first series passage from the first suction port located in the high pressure portion from flowing out again from the first suction port located in the low pressure portion. Therefore, it is possible to prevent the drain once collected from the first suction port from flowing out to the outside.

Further, in the steam turbine blade according to the fourteenth aspect of the present invention, in any one of the ninth to thirteenth aspects, the second suction port is formed on the convex dorsal side surface of the blade surface. It may be formed.

Further, in the steam turbine blade according to the fifteenth aspect of the present invention, in any one of the ninth to fourteenth aspects, the second suction port is the upper half of the blade surface in the blade height direction. It may be formed in the region.

Further, in the steam turbine blade according to the sixteenth aspect of the present invention, in any one of the ninth to fifteenth aspects, the second drain flow path is the ventral plate material rather than the ventral side surface. A second drain flow path forming surface formed on the inner side surface of the ventral plate material located on the back side plate material side and the inner side surface of the back side plate material located on the ventral side plate material side of the back side plate material, respectively. The second drain flow path forming surface is formed by being recessed from at least one of the inner side surface of the ventral plate material and the inner surface of the back side plate material. May be good.

Further, in the steam turbine blade according to the seventeenth aspect of the present invention, in any one of the ninth to sixteenth aspects, the second continuous passage is the back of the ventral plate material rather than the ventral side surface. The second passage forming surface formed on the inner side surface of the ventral plate material located on the side plate material side and the inner side surface of the back side plate material located on the ventral side plate material side of the back side plate material, respectively. It may be formed between the ventral plate material and the dorsal plate material, and the second passage forming surface may be formed by being recessed from at least one of the inner side surface of the ventral plate material and the inner side surface of the dorsal plate material.

Further, in the steam turbine blade according to the eighteenth aspect of the present invention, in any one of the ninth to seventeenth aspects, the second suction port is the ventral plate material, more than the ventral side surface. It may be formed by a second suction port ventral side forming surface recessed from the inner side surface of the ventral plate material located on the dorsal plate material side, and an end surface on the front edge side of the dorsal plate material.

Further, in the steam turbine blade according to the nineteenth aspect of the present invention, in any one of the ninth to eighteenth aspects, the second suction port extends in the blade height direction at the blade surface. The second suction port and the second drain flow path may be communicated with each other in a state in which a plurality of the second communication passages are opened and separated from each other in the blade height direction and are independent of each other. ..

Further, the steam turbine according to the twentieth aspect of the present invention is a steam turbine having a rotor shaft rotating about an axis and any one of the ninth to nineteenth aspects arranged so as to surround the rotor shaft. Equipped with wings.

According to such a configuration, the drain can be efficiently recovered by the steam turbine blade, and the steam turbine can be operated efficiently.

According to the present invention, a space for collecting the drain can be easily formed inside the wing body.

It is a schematic diagram which shows the structure of the steam turbine of embodiment of this invention. It is a vertical cross-sectional view of the steam turbine which shows the flow state of the drain in the steam turbine of embodiment of this invention. It is sectional drawing in the virtual plane extending in the blade height direction of the stationary blade in the 1st Embodiment of this invention. It is sectional drawing in the virtual plane orthogonal to the blade height direction of the blade body of the stationary blade in the 1st Embodiment of this invention. It is a main part perspective view explaining the trailing edge end portion of the stationary blade in the 1st Embodiment of this invention. It is a flowchart which shows the manufacturing method of the steam turbine blade in embodiment of this invention. It is sectional drawing of the back side plate material in 1st Embodiment of this invention. It is sectional drawing of the ventral side plate material in 1st Embodiment of this invention. It is a main part perspective view explaining the trailing edge end part of the stationary blade in the 1st modification of 1st Embodiment of this invention. It is a main part perspective view explaining the trailing edge end portion of the stationary blade in the 2nd modification of the 1st Embodiment of this invention. It is sectional drawing in the virtual plane orthogonal to the blade height direction of the stationary blade in the 3rd modification of 1st Embodiment of this invention. It is sectional drawing in the virtual plane orthogonal to the blade height direction of the blade body of the stationary blade in the 2nd Embodiment of this invention. It is sectional drawing of the back side plate material in 2nd Embodiment of this invention. It is sectional drawing of the ventral side plate material in 2nd Embodiment of this invention.

<< First Embodiment >>
Hereinafter, the first embodiment according to the present invention will be described with reference to the drawings.
The steam turbine 100 is a rotary machine that extracts the energy of steam S as rotational power. The steam turbine 100 of this embodiment is a low pressure turbine. As shown in FIG. 1, the steam turbine 100 includes a casing 1, a vane 2, a rotor 3, and a bearing portion 4.

In the following, the direction in which the axial line Ac of the rotor 3 extends is referred to as the axial direction Da. Further, the circumferential direction with respect to the axis line Ac is simply referred to as the circumferential direction Dc. Further, the radial direction with respect to the axis line Ac is simply referred to as the radial direction Dr. Further, one side (first side) of the axial direction Da is the upstream side, and the other side (second side) of the axial direction Da is the downstream side.

In the casing 1, the internal space is airtightly sealed, and the flow path of the steam S is formed inside. The casing 1 covers the rotor 3 from the outside of the radial Dr. The casing 1 is formed with a steam inlet 11 for guiding steam S into the casing 1 on the upstream side portion. The casing 1 is formed with a steam outlet 12 on the downstream side for discharging the steam S that has passed through the casing 1 to the outside.

A plurality of stationary blades 2 are provided on the surface facing the inside of the casing 1 side by side along the circumferential direction Dc of the rotor 3. The stationary blades 2 are arranged at intervals in the radial direction with respect to the rotor 3. The stationary blades 2 are arranged at intervals from the moving blades 6 to be described later in the axial direction Da.

The rotor 3 rotates about the axis line Ac. The rotor 3 has a rotor shaft 5 and a moving blade 6.

The rotor shaft 5 is rotatable about the axis line Ac. The rotor shaft 5 extends in the axial direction Da so as to penetrate the casing 1. The intermediate portion of the rotor shaft 5 provided with the moving blades 6 is housed inside the casing 1. Both ends of the rotor shaft 5 project to the outside of the casing 1. Both ends of the rotor shaft 5 are rotatably supported by bearings 4.

The bearing portion 4 rotatably supports the rotor 3 around the axis Ac. The bearing portion 4 includes journal bearings 41 provided at both ends of the rotor shaft 5, and thrust bearings 42 provided on one end side of the rotor shaft 5.

A plurality of rotor blades 6 are arranged side by side in the circumferential direction Dc so as to surround the rotor shaft 5. The plurality of moving blades 6 form an annular shape and are arranged on the outer peripheral surface of the rotor shaft 5. The rotor blade 6 receives the steam S flowing in the axial direction Da of the rotor 3 and rotates the rotor shaft 5 around the axis Ac.

Here, the stationary blade 2 will be described as an example of the steam turbine blade of the present embodiment. The steam turbine blade is not limited to the stationary blade 2, and may be a moving blade 6.

As shown in FIG. 2, the stationary blades 2 are arranged in an annular shape and connected to each other to form one stationary blade ring. A plurality of stationary blades 2 are arranged in the circumferential direction Dc so as to surround the rotor shaft 5. As shown in FIGS. 2 and 3, the stationary blade 2 of the present embodiment has a blade main body 7, an inner shroud 21, and an outer shroud 22.

As shown in FIGS. 3 and 4, the blade body 7 has a blade shape in cross section and extends in the blade height direction D1 as the radial direction Dr. The blade body 7 has a blade surface 70 extending in the blade height direction D1. The wing body 7 has a dorsal side surface 701 formed in a convex shape when viewed from the wing height direction D1. The wing body 7 has a ventral side surface 702, which is a ventral wing surface 70, formed in a concave shape when viewed from the wing height direction D1. The wing body 7 has a leading edge portion 7a formed by an end portion on the front side in the chord direction D2 to which the dorsal side surface 701 and the ventral side surface 702 are connected. The wing body 7 has a trailing edge 7b formed at the rear end of the chord direction D2 to which the dorsal side surface 701 and the ventral side surface 702 are connected. A plurality of blade bodies 7 are arranged apart from each other with the blade thickness direction D3 as the circumferential direction Dc.

Here, the blade height direction D1 of the blade body 7 is the direction in which the blade body 7 extends. Further, the chord direction D2 of the wing body 7 is a direction orthogonal to the wing height direction D1 in the present embodiment, and is the end portion and the trailing edge portion on the front edge portion 7a side including the extending direction of the wing chord of the wing body 7. The direction is parallel to the virtual line connecting the end portion on the edge portion 7b side. The blade thickness direction D3 of the blade body 7 is a direction orthogonal to the blade height direction D1 and the blade chord direction D2 in the present embodiment.

As shown in FIGS. 2 and 3, the inner shroud 21 connects a plurality of blade bodies 7 on the base end side in the blade height direction D1. The inner shroud 21 of the present embodiment has an arc shape when viewed from the axial direction Da. The inner shroud 21 is internally formed with an inner discharge flow path 210 for discharging drain, which will be described later. The inner discharge flow path 210 is connected to a condenser (not shown) to create a negative pressure (for example, vacuum).

The outer shroud 22 connects a plurality of blade bodies 7 on the tip end side in the blade height direction D1. Therefore, the outer shroud 22 is arranged on the side opposite to the inner shroud 21 in the blade height direction D1 with the blade body 7 interposed therebetween. The outer shroud 22 of the present embodiment has an arc shape when viewed from the axial direction Da. The outer shroud 22 has an outer discharge flow path 220 formed inside for draining drain, which will be described later. The outer discharge flow path 220 is connected to a condenser (not shown) to create a negative pressure (for example, vacuum).

In the stationary blade 2, as shown in FIG. 2, the main flow path C1 through which the steam S flows is formed by the adjacent blade main body 7, the inner shroud 21, and the outer shroud 22. As shown in FIG. 1, the main flow path C1 is a space inside the casing 1 sandwiched between the steam inlet 11 and the steam outlet 12. The blade body 7 is arranged in the main flow path C1 through which the steam S flows. The outward facing surface of the inner shroud 21 in the radial direction defines the inner position of the annular main flow path C1 in the radial direction. The inward-facing surface of the outer shroud 22 in the radial direction defines the outer position of the annular main flow path C1 in the radial direction.

Further, as shown in FIG. 4, the wing body 7 of the present embodiment has a dorsal plate member 71, a ventral plate member 72, and a plurality of joints 73.

The dorsal plate member 71 forms a convex dorsal side surface 701 as a wing surface 70. The dorsal plate member 71 is a plate-shaped member, and is curved so as to form a space inside the wing body 7. The dorsal side surface 701 is a surface facing outward when the dorsal plate member 71 is joined to the ventral plate member 72. Further, in the dorsal plate material 71, when the dorsal plate material 71 is joined to the ventral plate material 72, it is a surface that forms a space inside the wing body 7, and is closer to the ventral plate material 72 than the dorsal side surface 701. The surface to be located is the inner side surface 71a of the back plate material. In the dorsal plate material 71 of the present embodiment, the inner side surface 71a of the dorsal plate material forms a part of the ventral side surface 702 in the trailing edge portion 7b, thereby forming the end portion of the trailing edge portion 7b.

The ventral plate member 72 forms a concave ventral side surface 702 as the wing surface 70. The ventral plate member 72 is a plate-shaped member, and is curved so as to form a space inside the wing body 7 together with the dorsal plate member 71. The ventral side surface 702 is a surface facing outward when the ventral plate member 72 is joined to the dorsal plate member 71. Further, in the ventral plate 72, when the ventral plate 72 is joined to the dorsal plate 71, it is a surface that forms a space inside the wing body 7, and is closer to the dorsal plate 71 than the ventral side 702. The surface to be located is the inner side surface 72a of the ventral plate material.

The joint portion 73 joins the dorsal side plate material 71 and the ventral side plate material 72. The joint portion 73 of the present embodiment is a portion where the dorsal side plate material 71 and the ventral side plate material 72 are joined by brazing, and is formed by solidifying the silver wax. The joint portion 73 joins the dorsal plate member 71 and the ventral plate member 72 without a gap in the blade height direction D1. In the wing body 7 of the present embodiment, the joint portions 73 are provided at a plurality of locations separated in the chord direction D2, such as the leading edge portion 7a, the trailing edge portion 7b, and the partition portion 80 described later. There is.

The joining portion 73 is not limited to a structure in which the joining portion 73 is joined by brazing, and the dorsal side plate member 71 and the ventral side plate member 72 may be joined. The joint portion 73 may be joined in a welded state, for example.

Further, the blade body 7 of the present embodiment includes a first suction port 74, a first drain flow path 75, a first series passage 76, a second drain flow path 77, a second suction port 78, and a second. It has a communication passage 79 and a partition portion 80.

The first suction port 74 extends in the blade height direction D1 and opens at the blade surface 70. The first suction port 74 of the present embodiment is formed only on the ventral side surface 702. The first suction port 74 is formed in the upper half region of the ventral side surface 702 in the blade height direction D1. Here, the upper half region is a region on the outer shroud 22 side of the center position in the blade height direction D1. That is, the first suction port 74 is formed as one long groove recessed from the center position of the ventral side surface 702 in the blade height direction D1 toward the outer shroud 22 so as to extend in the blade height direction D1. The first suction port 74 is formed in a rectangular shape that is elongated and extends in the blade height direction D1 when the ventral side surface 702 is viewed from the blade thickness direction D3. The first suction port 74 is formed on the trailing edge portion 7b side of the center of the chord direction D2. The first suction port 74 is formed by a first suction port forming surface 81 formed on at least one of the back side plate material 71 and the ventral side plate material 72. As shown in FIG. 5, the first suction port 74 of the present embodiment is recessed from the end surface 72b on the trailing edge portion 7b side of the ventral plate material 72 and the inner side surface 71a of the back side plate material 71 of the back side plate material 71. It is formed by the dorsal side forming surface 81a. Therefore, in the present embodiment, the first suction port forming surface 81 forming the first suction port 74 is the end surface 72b on the trailing edge portion 7b side of the ventral plate material 72 and the inner side surface 71a of the back side plate material 71 of the back side plate material 71. It is a first suction port dorsal side forming surface 81a formed in.

As shown in FIG. 4, the first drain flow path 75 is a space formed between the dorsal side plate material 71 and the ventral side plate material 72. As shown in FIG. 3, the first drain flow path 75 extends in the blade height direction D1 inside the blade body 7. The first drain flow path 75 penetrates the blade body 7 so as to communicate with the inner shroud 21 and the outer shroud 22. In the first drain flow path 75, a throttle portion 751 for narrowing the flow path is formed at a connecting portion with a space formed inside the inner shroud 21 and the outer shroud 22. As shown in FIG. 4, the first drain flow path 75 is formed by the first drain flow path forming surface 82 formed on the inner side surface 71a of the back side plate material and the inner side surface 72a of the ventral side plate material, respectively, to form the back side plate material 71 and the ventral plate material. It is formed between 72 and 72. The first drain flow path forming surface 82 is formed by being recessed from at least one of the inner side surface 71a of the dorsal plate material and the inner side surface 72a of the ventral plate material. The first drain flow path 75 of the present embodiment has a first drain flow path back side forming surface 82a that is recessed from the back side plate material inner side surface 71a so as to form a concave curved surface, and a concave curved surface from the ventral plate material inner side surface 72a. It is formed by a first drain flow path ventral forming surface 82b that is recessed so as to form. The first drain flow path dorsal side forming surface 82a of the present embodiment is recessed so as to form a concave curved surface from the first suction port dorsal side forming surface 81a. Therefore, the first drain flow path forming surface 82 forming the first drain flow path 75 in the present embodiment includes the first drain flow path back side forming surface 82a formed on the inner side surface 71a of the back side plate material and the ventral plate material. It is formed on the inner side surface 72a and is the first drain flow path ventral side forming surface 82b. That is, the first drain flow path forming surface 82 of the present embodiment is recessed from both the inner side surface 71a of the back side plate material and the inner side surface 72a of the ventral side plate material, respectively.

As shown in FIG. 5, a plurality of first series passages 76 are formed inside the blade body 7 apart from each other in the blade height direction D1. The plurality of first series passages 76 communicate the first suction port 74 and the first drain flow path 75 in a state of being independent of each other. That is, the plurality of first series passages 76 are formed so as not to be connected to each other between the first suction port 74 and the first drain flow path 75. The first series passage 76 is a space formed between the dorsal plate member 71 and the ventral plate member 72. The first series passage 76 is formed between the back side plate material 71 and the ventral plate material 72 by the first series passage forming surface 83 formed on the inner side surface 71a of the back side plate material and the inner side surface 72a of the ventral side plate material, respectively. .. The first series passage forming surface 83 is formed by being recessed from at least one of the inner side surface 71a of the dorsal plate material and the inner side surface 72a of the ventral plate material. The first series passage 76 of the present embodiment is a first series passage ventral forming surface that is recessed in a square groove shape from the first suction port dorsal side forming surface 81a and the ventral plate material inner side surface 72a of the ventral plate material 72. It is formed by 83b. Therefore, the first series passage forming surface 83 forming the first series passage 76 in the present embodiment is a first series formed on a part of the dorsal side forming surface 81a of the first suction port and the inner side surface 72a of the ventral plate material. It is a passage ventral forming surface 83b. That is, the first series passage forming surface 83 of the present embodiment is recessed only from the inner side surface 72a of the ventral plate material.

As shown in FIG. 4, the second drain flow path 77 is formed on the leading edge portion 7a side of the first drain flow path 75. The second drain flow path 77 is a space formed between the dorsal plate member 71 and the ventral plate member 72. As shown in FIG. 3, the second drain flow path 77 extends in the blade height direction D1 inside the blade body 7. The second drain flow path 77 penetrates the blade body 7 so as to communicate with the inner shroud 21 and the outer shroud 22. As shown in FIG. 4, the second drain flow path 77 is formed by the second drain flow path forming surface 84 formed on the inner side surface 71a of the back side plate material and the inner side surface 72a of the ventral side plate material, respectively, so that the back side plate material 71 and the ventral plate material 71 are formed. It is formed between 72 and 72. In the second drain flow path 77 of the present embodiment, the dorsal side forming surface 84a of the second drain flow path formed on the inner side surface 71a of the back side plate material 71 and the ventral plate material 72 are bent by bending the back side plate material 71. As a result, it is formed by the second drain flow path ventral forming surface 84b formed on the inner side surface 72a of the ventral plate material. Therefore, the second drain flow path forming surface 84 forming the second drain flow path 77 in the present embodiment is ventral to the second drain flow path back side forming surface 84a which is a part of the inner side surface 71a of the back side plate material. It is a second drain flow path ventral side forming surface 84b which is a part of the inner side surface 72a of the plate material.

The second suction port 78 is opened at the back side surface 701. The second suction port 78 extends on the back side surface 701 in the blade height direction D1 and opens. The second suction port 78 of the present embodiment is formed only on the back side surface 701. The second suction port 78 is formed in the upper half region of the dorsal side surface 701 in the blade height direction D1. The second suction port 78 is formed as one long groove recessed from the center position of the dorsal side surface 701 in the blade height direction D1 toward the outer shroud 22 so as to extend in the blade height direction D1. The second suction port 78 is formed in a rectangular shape that is elongated and extends in the blade height direction D1 when the back side surface 701 is viewed from the blade thickness direction D3. The second suction port 78 is formed on the leading edge portion 7a side of the center of the chord direction D2.

A plurality of second passages 79 are formed inside the blade body 7 apart from each other in the blade height direction D1. The second communication passage 79 communicates the second suction port 78 and the second drain flow path 77 in a state of being independent of each other. The second passage 79 of the present embodiment is a through hole penetrating the back side plate member 71. The plurality of second connecting passages 79 are formed so as to be separated from each other between the second drain flow path 77 and the second suction port 78 so as not to be connected to each other.

The partition portion 80 partitions the first drain flow path 75 and the second drain flow path 77 so as to be independent of each other inside the blade main body 7. The partition portion 80 is a region between the first drain flow path 75 and the second drain flow path 77 where the dorsal side plate material 71 and the ventral side plate material 72 are joined. The partition portion 80 isolates the first drain flow path 75 and the second drain flow path 77 over the entire area in the blade height direction D1. The partition portion 80 of the present embodiment is formed by a joint portion 73 in which the inner side surface 71a of the back side plate material 71 of the back side plate material 71 and the inner side surface 72a of the ventral plate material of the ventral plate material 72 are joined.

Next, the method for manufacturing the steam turbine blade (static blade 2) described above will be described with reference to the flowchart shown in FIG.

As shown in FIG. 6, the method S1 for manufacturing a steam turbine blade includes a preparation step S2, a processing step S3, and a joining step S4.

In the steam turbine blade manufacturing method S1, first, the preparation step S2 is carried out. In the preparation step S2, a flat plate-shaped dorsal plate member 71 capable of forming a convex dorsal side surface 701 as the blade surface 70 is prepared. In the preparation step S2, a flat plate-shaped ventral plate member 72 capable of forming a concave ventral side surface 702 as the wing surface 70 is prepared. The dorsal plate material 71 and the ventral plate material 72 prepared in the preparation step S2 have a flat plate shape having a rectangular cross section.

In the processing step S3, the dorsal plate material 71 and the ventral plate material 72 are processed. In the processing step S3, the first suction port forming surface 81 forming the first suction port 74 is formed on at least one of the back side plate material 71 and the ventral side plate material 72. In the processing step S3, the first drain flow path forming surface 82 forming the first drain flow path 75 and the first series passage forming the first series passage 76 are formed on both the back side plate material 71 and the ventral side plate material 72. A surface 83 is formed. In the processing step S3, the back side surface 701 is formed on the back side plate member 71. In the processing step S3, the ventral side surface 702 is formed on the ventral plate member 72. In the processing step S3, the second drain flow path forming surface 84 forming the second drain flow path 77 is formed on both the back side plate member 71 and the ventral side plate material 72. In the processing step S3, the second suction port 78 and the second connecting passage 79 are formed in the back plate material 71.

In the processing step S3 of the present embodiment, the first suction port dorsal side forming surface 81a is formed as the first suction port forming surface 81. In the processing step S3, the first drain flow path dorsal side forming surface 82a and the first drain flow path ventral side forming surface 82b are formed as the first drain flow path forming surface 82. In the processing step S3, the first series passage ventral side forming surface 83b is formed as the first series passage forming surface 83. In the processing step S3, a second drain flow path dorsal side forming surface 84a and a second drain flow path ventral side forming surface 84b are formed as the second drain flow path forming surface 84.

Further, the processing step S3 of the present embodiment includes a removal step S31 for scraping and removing a part of the back side plate material 71 and the ventral plate material 72, and a bending step S32 for bending the back side plate material 71 and the ventral plate material 72. I'm out.

In the removal step S31, as shown in FIGS. 7 and 8, the dorsal plate material 71 and the ventral plate material 72 are scraped by grinding or cutting to partially remove them. In the removal step S31, the first suction port forming surface 81, the first drain flow path forming surface 82, the first series passage forming surface 83, the second suction port 78, and the second continuous passage 79 are formed. In the removal step S31, the first drain flow path forming surface 82 is formed so as to be recessed from at least one of the inner side surface 71a of the dorsal plate material and the inner side surface 72a of the ventral plate material. In the removal step S31, the first series passage forming surface 83 is formed so as to be recessed from at least one of the inner side surface 71a of the dorsal plate material and the inner side surface 72a of the ventral plate material.

Specifically, the case of processing the back plate material 71 will be described. As shown in FIG. 7, in the removal step S31 of the present embodiment, when the dorsal plate member 71 is combined with the ventral plate member 72, the leading edge portion 7a, the trailing edge portion 7b, and the blade surface 70 are formed. Unnecessary parts are scraped and removed from the plate-shaped dorsal plate member 71. At this time, in the removal step S31, the worker scrapes the inner side surface 71a of the back side plate material to form the first suction port back side forming surface 81a on the back side plate material 71 as the first suction port forming surface 81. In the removal step S31, the worker further scrapes a part of the first suction port dorsal side forming surface 81a to form the first drain flow path dorsal side forming surface 82a on the back side plate material 71. In the removal step S31, the back side surface 701 is scraped to form the second suction port 78. In the removal step S31, a second communication passage 79 penetrating the back side plate member 71 is formed so as to communicate the second suction port 78 and the second drain flow path forming surface 84.

Next, a case where the ventral plate material 72 is processed will be described. As shown in FIG. 8, in the removal step S31 of the present embodiment, when the dorsal plate member 71 is combined with the ventral plate member 72, the leading edge portion 7a, the trailing edge portion 7b, and the blade surface 70 are formed. Unnecessary parts are scraped and removed from the plate-shaped ventral plate material 72. At this time, in the removal step S31, the worker scrapes the trailing edge portion 7b side of the ventral plate member 72 to form the first suction port forming surface 81, which is smooth corresponding to the shape of the first suction port dorsal side forming surface 81a. End face is formed. In the removal step S31, the worker scrapes the inner side surface 72a of the ventral plate material to form the first drain flow path ventral side forming surface 82b on the ventral plate material 72. In the removal step S31, the worker scrapes the inner side surface 72a of the ventral plate material to form the first series passage ventral side forming surface 83b on the ventral plate material 72.

In the bending step S32, the back plate material 71 and the ventral plate 72 are curved to form a blade surface 70 having a predetermined shape on the dorsal plate 71 and the ventral plate 72. Therefore, by bending the dorsal plate member 71 and the ventral plate member 72 in the bending step S32, the dorsal side surface 701 is formed in a convex shape and the ventral side surface 702 is formed in a concave shape. In the bending step S32, the inner side surface 71a of the back side plate material is bent in a concave shape, so that the second drain flow path back side forming surface 84a is formed on the back side plate material 71 as the second drain flow path forming surface 84. In the bending step S32, the inner side surface 72a of the ventral plate material is bent in a convex shape to form the second drain flow path ventral side forming surface 84b on the ventral plate material 72 as the second drain flow path forming surface 84.

In the joining step S4, the back is formed so that the first suction port 74, the first drain flow path 75, the first series passage 76, and the second drain flow path 77 are formed between the back side plate material 71 and the ventral side plate material 72. The side plate material 71 and the ventral side plate material 72 are joined. Specifically, in the joining step S4, the dorsal plate member 71 and the ventral plate member 72 are joined at the end of the leading edge portion 7a. Further, in the joining step S4, the dorsal plate material 71 and the ventral plate material 71 so as to form the first suction port 74 between the first suction port dorsal side forming surface 81a and the end surface 72b on the trailing edge portion 7b side of the ventral plate material 72. 72 is joined. Further, in the joining step S4, the dorsal plate member 71 and the ventral plate member 72 are joined between the second drain flow path forming surface 84 and the first drain flow path forming surface 82. As a result, in the joining step S4, a partition portion 80 that partitions the second drain flow path 77 and the first drain flow path 75 so as to be independent of each other is formed as the joining portion 73. In the joining step S4, the dorsal side plate member 71 and the ventral side plate material 72 are joined by brazing.

In the steam turbine 100 as described above, as shown in FIG. 2, the blade body 7 of the stationary blade 2 is arranged in the main flow path C1 through which the steam S flows from the upstream side to the downstream side in the axial direction Da. There is. In this steam S, water droplets are generated as the pressure drops. Therefore, water droplets are likely to be generated especially in the vicinity of the final stage on the most downstream side. Therefore, the steam S circulates in the main flow path C1 in a state containing water droplets. When the steam S flows in the vicinity of the ventral side surface 702, the water droplets in the steam S adhere to the ventral side surface 702 as fine water droplets due to inertia. Further, when the steam S flows in the vicinity of the back side surface 701, the water droplets in the steam S adhere to the back side surface 701 as fine water droplets due to inertia.

When the steam S containing water droplets collides with the blade body 7, water droplets (drain) adhere to the blade surface 70. In particular, the drain adhering to the ventral side surface 702 flows so as to form a liquid film from the front edge portion 7a side to the trailing edge portion 7b side along the concave ventral side surface 702 as shown in FIG. .. The drain adhering to the ventral side surface 702 flows into the first suction port 74 on the way toward the end of the trailing edge portion 7b. Here, the first drain flow path 75 is connected to a condenser (not shown) via the inner discharge flow path 210 of the inner shroud 21 and the outer discharge flow path 220 of the outer shroud 22 to create a vacuum state. It has become. Therefore, the drain that has flowed into the first suction port 74 is drawn into the first series of passages 76 that are separated from each other in the blade height direction D1 and flows into the first drain flow path 75. The drain that has flowed into the first drain flow path 75 goes toward the inner shroud 21 or the outer shroud 22 as shown in FIG. After that, as shown in FIG. 2, the drain is sent to the condenser via the inner discharge flow path 210 of the inner shroud 21 and the outer discharge flow path 220 of the outer shroud 22. In the blade body (the blade body located at the lowermost position in the vertical direction) in which some of the first suction ports 74 and the second suction ports 78 are not formed, the drain accumulated in the inner discharge flow path 210 is caused by negative pressure. It flows through the wing body toward the outer discharge flow path 220.

Further, as shown in FIG. 4, the drain adhering to the back side surface 701 flows from the front edge portion 7a side to the trailing edge portion 7b side along the convex back side surface 701. Normally, the drain adhering to the back side surface 701 is separated from the back side surface 701 before reaching the end portion on the trailing edge portion 7b side because the back side surface 701 has a convex shape. However, since the second suction port 78 is formed on the front edge portion 7a side of the center of the chord direction D2, the drain adhering to the back side surface 701 flows into the second suction port 78 before being peeled off. Here, the second drain flow path 77 is connected to the condenser via the inner discharge flow path 210 of the inner shroud 21 and the outer discharge flow path 220 of the outer shroud 22, similarly to the first drain flow path 75. By being there, it is in a vacuum state. Therefore, the drain that has flowed into the second suction port 78 is drawn into a plurality of second continuous passages 79 that are separated from each other in the blade height direction D1 and flows into the second drain flow path 77. The drain that has flowed into the second drain flow path 77 goes toward the inner shroud 21 or the outer shroud 22 as shown in FIG. After that, as shown in FIG. 2, the drain merges with the drain flowing from the first drain flow path 75 at the inner discharge flow path 210 of the inner shroud 21 and the outer discharge flow path 220 of the outer shroud 22, and is a condenser. Will be sent to.

In the stationary blade 2 manufactured by the steam turbine blade manufacturing method S1 as described above, the blade body 7 is formed by joining the two plate members of the dorsal side plate member 71 and the ventral side plate member 72. Specifically, in the removal step S31, the first suction port dorsal side forming surface 81a and the first drain flow path dorsal side forming surface 82a are formed on the flat plate-shaped dorsal plate material 71. Further, a first drain flow path ventral side forming surface 82b and a first series passage ventral side forming surface 83b are formed on the flat plate-shaped ventral plate member 72. Further, in the bending step S32, the back side forming surface 84a of the second drain flow path is formed on the back side plate member 71. Further, a second drain flow path ventral side forming surface 84b is formed on the flat plate-shaped ventral plate member 72. Then, by joining and combining the back side plate material 71 and the ventral side plate material 72 after the bending step S32, the first suction port 74, the first drain flow path 75, the first series passage 76, and the second drain flow path 77 are formed. It is formed. As described above, by processing the flat plate-shaped dorsal plate member 71 and the ventral side plate member 72 in advance in the removing step S31 and the bending step S32, the processing can be performed without being affected by the final shape of the blade body 7. Therefore, the dorsal forming surface 81a of the first suction port, the dorsal forming surface 82a of the first drain flow path, the ventral forming surface 82b of the first drain flow path, the ventral forming surface 83b of the first series passage, and the dorsal side of the second drain flow path. The side forming surface 84a and the second drain flow path ventral side forming surface 84b can be formed only by processing the flat plate-shaped dorsal plate material 71 and the ventral plate material 72. As a result, the dorsal forming surface 81a of the first suction port, the dorsal forming surface 82a of the first drain flow path, the ventral forming surface 82b of the first drain flow path, the ventral forming surface 83b of the first series passage, and the second drain flow path. The dorsal forming surface 84a and the second drain flow path ventral forming surface 84b can be easily processed. Further, the first suction port dorsal side forming surface 81a, the first drain flow path dorsal side forming surface 82a, the first drain flow path ventral side forming surface 82b, the first series passage ventral side forming surface 83b, the second drain flow path dorsal side. The machining accuracy of the side forming surface 84a and the second drain flow path ventral side forming surface 84b can be improved.

Further, the first suction port dorsal forming surface 81a, the first drain flow path dorsal forming surface 82a, the first drain flow path ventral forming surface 82b, and the first series passage ventral forming surface 83b, which are formed with high accuracy, The first suction port 74, the first drain flow path 75, the first series passage 76, and the second drain flow path 77 are provided by the second drain flow path dorsal side forming surface 84a and the second drain flow path ventral side forming surface 84b. It is formed. As a result, even if the blade body 7 has a shape that is difficult to process, such as when the blade body 7 is thin or the blade surface 70 is formed by a complicated three-dimensional curved surface, the blade body 7 The first suction port 74, the first drain flow path 75, the first series passage 76, and the second drain flow path 77 can be easily formed inside the blade body 7 while suppressing the influence of the processing difficulty due to the final shape. .. Therefore, a space for collecting the drain can be easily formed inside the wing body 7.

Further, by forming the first suction port 74, the first drain flow path 75, the first series passage 76, and the second drain flow path 77 by using the surfaces of the two plates, the first suction port 74, It is possible to improve the degree of freedom in manufacturing such as the position and shape of forming the first drain flow path 75, the first series passage 76, and the second drain flow path 77.

Further, the ventral forming surface 83b of the first series passage is formed as a groove recessed from the inner surface 72a of the ventral plate material. As a result, the first series passage forming surface 83 can be formed only by processing the surface of the flat plate-shaped ventral plate member 72. Therefore, the processing of the first series passage forming surface 83 becomes easy. Further, the first series passage 76 is formed between the back side plate member 71 and the ventral side plate member 72 by the first series passage forming surface 83. Therefore, the first series passage 76 can be easily formed inside the wing body 7.

Further, in the removal step S31, the first suction port dorsal side forming surface 81a, the first drain flow path dorsal side forming surface 82a, the first drain flow path ventral side forming surface 82b, the first series passage ventral side forming surface 83b, and The second passage 79 is formed by scraping the dorsal plate member 71 and the ventral plate member 72, respectively. Further, the second drain flow path forming surface 84 is formed in the bending step S32 at the timing of forming the dorsal side surface 701 and the ventral side surface 702. Therefore, in order to form the first suction port 74, the first drain flow path 75, the first series passage 76, the second drain flow path 77, and the second continuous passage 79, other than the back side plate material 71 and the ventral side plate material 72. There is no need to newly prepare another member of. As a result, the number of parts forming the blade body 7 can be reduced, and the manufacturing cost of the blade body 7 can be reduced.

Further, as the first drain flow path forming surface 82, the first drain flow path dorsal side forming surface 82a recessed from the inner side surface 71a of the back side plate material and the ventral side forming of the first drain flow path recessed from the ventral plate material inner side surface 72a. A surface 82b is formed. Therefore, by forming the first drain flow path forming surface 82 so as to be recessed from at least one of the back side plate material 71 and the ventral side plate material 72, the plate thickness of the back side plate material 71 and the ventral side plate material 72 is not increased. One drain flow path 75 can be formed larger.

Further, since the first drain flow path forming surface 82 can be formed only by processing the surface of the flat plate-shaped dorsal plate member 71 or the ventral side plate member 72, the processing of the first drain flow path forming surface 82 becomes easy. Further, the first drain flow path dorsal side forming surface 82a and the first drain flow path ventral side forming surface 82b form a first drain flow path 75 between the back side plate material 71 and the ventral plate material 72. Therefore, the first drain flow path 75 can be easily formed inside the blade body 7.

In particular, by forming both the first drain flow path dorsal side forming surface 82a and the first drain flow path ventral side forming surface 82b as in the present embodiment, either the back side plate material 71 or the ventral side plate material 72 is formed. Compared with the case where the first drain flow path forming surface 82 is formed only on one side, the depth of depression per sheet when forming the first drain flow path forming surface 82 can be suppressed. Therefore, it is possible to prevent the back side plate material 71 and the ventral side plate material 72 from becoming thick.

Further, the second drain flow path forming surface 84 can be formed only by bending the flat plate-shaped dorsal plate member 71 and the ventral plate member 72. As a result, the processing of the second drain flow path forming surface 84 becomes easy. Further, the second drain flow path 77 is formed by the second drain flow path forming surface 84. Therefore, even if the final shape of the blade body 7 is difficult to process inside, such as when the blade body 7 is thin or the blade surface is formed by a complicated three-dimensional curved surface. The second drain flow path 77 can be easily formed inside the blade body.

Further, a partition portion 80 that keeps the first drain flow path 75 and the second drain flow path 77 in an independent state is formed by the joint portion 73. Therefore, it is not necessary to form the partition portion 80 with a separate member or to cut out the partition portion 80 by post-machining such as drilling or electric discharge machining. Therefore, by joining the two plates so as to form the partition portion 80 after processing them in advance, even if the blade body 7 has a shape that is difficult to process, the blade height is inside the blade body 7. Two spaces communicating with the longitudinal direction D1 can be easily formed in an independent state. Therefore, the independent first drain flow path 75 and the second drain flow path 77 can be formed inside the blade body 7 while suppressing the influence of the processing difficulty due to the shape of the blade body 7. That is, it is possible to further improve the degree of freedom in manufacturing such as the position and shape of forming the first drain flow path 75 and the second drain flow path 77.

Further, the second drain flow path 77 connected to the second suction port 78 and the first drain flow path 75 connected to the first suction port 74 are independent of each other inside the blade body 7 by the partition portion 80. Therefore, it is possible to prevent the second suction port 78 and the first suction port 74 from communicating with each other inside the blade body 7. As a result, the drain collected from the ventral side surface 702, which has a higher pressure than the dorsal side surface 701, through the first suction port 74 passes through the inside of the wing body 7, and is formed on the back side surface 701, which has a lower pressure. It is possible to prevent the outflow from the mouth 78. Therefore, it is possible to prevent the drain once collected from the first suction port 74 from flowing out to the outside, and it is possible to efficiently remove the drain adhering to the blade surface 70.

Further, a plurality of first series passages 76 are formed independently in the blade height direction D1. Therefore, even if there is a pressure difference around the ventral side surface 702 in the blade height direction D1 where the first suction port 74 extends, the drain in the first series passage 76 responds to the pressure difference in the blade height direction D1. It is possible to suppress the movement in the blade height direction D1. As a result, the drain once drawn into the first series passage 76 from the first suction port 74 located in the high pressure portion flows out again from the first suction port 74 located in the low pressure portion. It can be suppressed. Therefore, it is possible to prevent the drain once collected from the first suction port 74 from flowing out to the outside, and it is possible to efficiently remove the drain adhering to the blade surface 70.

Further, a plurality of first series passages 76 are independently formed in the blade height direction D1. As a result, the inflow of steam S flowing around can be suppressed as compared with the case where the vapor S is formed so as to communicate with each other over the entire area of the blade height direction D1. Therefore, the drain can be removed while suppressing the influence on the flow of the steam S flowing through the main flow path C1.

Further, the first suction port 74 is formed in the upper half region of the ventral side surface 702 in the blade height direction D1. As a result, the drain adhering to the upper half region of the ventral side surface 702 in the blade height direction D1 can flow into the first suction port 74. Therefore, the drain that adheres to the ventral side surface 702 and flows toward the trailing edge 7b side can be collected with high accuracy.

Further, the first suction port 74 is formed on the ventral side surface 702, and the second suction port 78 is formed on the dorsal side surface 701. Therefore, a structure for collecting the drain can be independently formed on the back side surface 701 separately from the first suction port 74.

Further, the first suction port 74 is formed on the ventral side surface 702 on the trailing edge portion 7b side of the center of the chord direction D2. Therefore, the drain that has flowed to the trailing edge portion 7b side while adhering to the ventral side surface 702 and forming a liquid film can be collectively flowed into the first suction port 74. As a result, more drain can be recovered from the first suction port 74.

Further, in the present embodiment, the first series passage 76 is formed by joining the dorsal plate material 71 and the ventral plate 72 after grooving the ventral plate 72 instead of drilling. .. As a result, the first suction port 74 can be formed in the vicinity of the joint portion 73. As a result, the first suction port 74 can be formed in a thin portion such as the end portion on the trailing edge portion 7b side while maintaining the strength. That is, the first suction port 74 can be formed at a position closer to the end of the trailing edge portion 7b, and more drain can be collected from the first suction port 74. Therefore, the drain adhering to the ventral side surface 702 can be efficiently recovered.

Further, a second suction port 78 is formed on the leading edge portion 7a side of the first suction port 74. Therefore, before the drain adhering to the back side surface 701 is separated from the back side surface 701, the drain can be collected through the second suction port 78.

Further, according to the steam turbine 100 as described above, the drain can be efficiently recovered by the stationary blade 2, and the steam turbine 100 can be operated efficiently.

<< First variant >>
Next, the wing body 7A of the first modification of the first embodiment will be described with reference to FIG.
In the first modification, the same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. The blade body 7A of the first modification is different from the first embodiment in that the first series passage forming surface 83 forming the first series passage 76 is formed on the back side plate member 71.

As shown in FIG. 9, the first series passage 76 of the first modification is recessed in a square groove shape from the inner side surface 72a of the ventral plate material and the dorsal forming surface 81a of the first suction port of the dorsal plate material 71. It is formed by a first series passage dorsal side forming surface 83a. Therefore, the first series passage forming surface 83 forming the first series passage 76 in the present embodiment is a part of the inner side surface 72a of the ventral plate material and the back side forming surface 83a of the first series passage. As in the case of forming the first drain flow path dorsal side forming surface 82a, the worker further removes a part of the first suction port dorsal side forming surface 81a from the first series passage dorsal side forming surface 83a in the removing step S31. It is formed by shaving. The dorsal forming surface 83a of the first series passage is recessed from the dorsal forming surface 81a of the first suction port as a plurality of square grooves arranged apart from each other in the blade height direction D1.

The dorsal forming surface 83a of the first series passage is formed as a groove recessed from the dorsal forming surface 81a of the first suction port. As a result, the first series passage forming surface 83 can be formed only by processing the surface of the flat plate-shaped dorsal plate member 71. Therefore, the processing of the first series passage forming surface 83 becomes easy. Further, the first series passage 76 is formed between the back side plate member 71 and the ventral side plate member 72 by the first series passage forming surface 83. Therefore, the first series passage 76 can be easily formed inside the wing body 7.

Further, even in the first series passage 76 of the first modification, a plurality of the first series passage forming surfaces 83 are formed independently of each other as in the case where the first series passage forming surface 83 is provided on the ventral plate member 72 as in the embodiment. Will be done. As a result, the drain can be efficiently flowed from the first suction port 74 to the first drain flow path 75.

<< Second variant >>
Next, the wing body 7B of the second modification of the first embodiment will be described with reference to FIG.
In the second modification, the same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. The blade body 7B of this second modification differs from the first embodiment in the position where the first suction port 74A is formed.

As shown in FIG. 10, the first suction port 74A of the second modification is formed at the end of the wing surface 70 on the trailing edge 7b side where the ventral side surface 702 and the dorsal side surface 701 are connected. .. That is, the first suction port 74A is recessed as if the end portion on the trailing edge portion 7b side was scraped. The first suction port 74A of the second modification is formed by both the dorsal side surface 701 and the ventral side surface 702. The first suction port 74A is formed over the entire area of the end portion on the trailing edge portion 7b side in the blade height direction D1. The first suction port 74A is formed as one angular groove extending long in the blade height direction D1. The first suction port 74A is formed by a first suction port forming surface 81 formed on each of the back side plate member 71A and the ventral side plate member 72A. The first suction port 74A of the second modification is the first suction port back side forming surface 91a recessed from the end surface on the trailing edge 7b side of the back side plate material 71A and the inner side surface 71a of the back side plate material, and the ventral plate material 72A. It is formed by an end surface on the trailing edge 7b side and a ventral forming surface 91b of the first suction port recessed from the inner side surface 72a of the ventral plate material. In the second modification, the first suction port forming surface 81 forming the first suction port 74A is a first suction port dorsal side forming surface 91a and a first suction port ventral side forming surface 91b.

The first suction port 74A of the second modification is formed at the end portion on the trailing edge portion 7b side. Therefore, the drain adhering to the dorsal side surface 701 and the ventral side surface 702 and flowing to the trailing edge portion 7b side can be collected at the most downstream end portion, and as a result, more drain can be collected at the first suction port 74A. Can be recovered from. Therefore, the drain adhering to the dorsal side surface 701 and the ventral side surface 702 can be efficiently collected.

<< Third variant >>
Next, the wing body 7D of the third modification of the first embodiment will be described with reference to FIG.
In the third modification, the same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. The blade body 7D of this third modification is different from the first embodiment in that it is composed of a single plate material.

As shown in FIG. 11, the wing body 7D of the third modification has one wing forming plate member 99 and a joint portion 73 as the dorsal plate member 71 and the ventral plate member 72. The wing forming plate member 99 is a single plate material having a shape like connecting the dorsal side plate material 71 and the ventral side plate member 72 of the first embodiment. The wing forming plate member 99 is bent to form both the dorsal side surface 701C and the ventral side surface 702C as the wing surface 70. The blade forming plate member 99 is curved so as to form a space inside the blade body 7D. The blade forming plate member 99 is bent so as to form the leading edge portion 7a. That is, in the wing body 7D of the third modification, the joint portion 73 is not formed at the end portion on the leading edge portion 7a side. The blade forming plate member 99 forms a joint portion 73 by joining both ends on the trailing edge portion 7b side. That is, in the blade body 7D of the fourth modification, the first suction port 74 is formed by joining both ends of the blade forming plate member 99.

When manufacturing the blade body 7D of the third modification, the dorsal plate member 71 and the ventral plate member 72 are prepared as one blade forming plate member 99 in the preparation step S2 of the steam turbine blade manufacturing method S1. After that, the blade forming plate member 99 is bent in the bending step S32 to form the end portion of the blade body 7D on the leading edge portion 7a side. Further, the first suction port 74 is formed by joining both ends of the blade forming plate member 99 in the joining step S4.

According to the stationary blade 2 of the third modification as described above, the blade body 7D can be formed by reducing the number of parts. As a result, the manufacturing cost of the blade body 7D can be reduced.

<< Second Embodiment >>
Next, a second embodiment of the steam turbine blade of the present invention will be described with reference to FIGS. 12 to 14. The stationary blade, which is the steam turbine blade shown in the second embodiment, is different from the first embodiment in that the blade body has a solid structure. Therefore, in the description of the second embodiment, the same parts as those of the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIG. 12, the wing body 7E of the second embodiment has a dorsal plate member 71E, a ventral plate member 72E, and a plurality of joints 73E.

The dorsal plate member 71E forms a part of the convex dorsal side surface 701E as the blade surface 70E. The dorsal plate member 71E is a plate-shaped member thinner and smaller than the dorsal plate member 71 of the first embodiment. The dorsal plate member 71E is curved along the ventral plate member 72E. The dorsal side surface 701E is a surface facing outward when the dorsal plate member 71E is joined to the ventral plate member 72E. Further, in the dorsal plate material 71E, when the dorsal plate material 71E is joined to the ventral plate material 72E, it is a surface facing the inside of the wing body 7E and is located on the ventral side plate material 72E side with respect to the dorsal side surface 701E. Is the inner side surface 710a of the back plate material. In the dorsal plate material 71E of the second embodiment, the inner side surface 710a of the dorsal plate material forms a part of the ventral side surface 702E in the trailing edge portion 7b, thereby forming the end portion of the trailing edge portion 7b.

The ventral plate member 72E forms a concave ventral side surface 702E and a part of the dorsal side surface 701E as the wing surface 70E. The ventral plate member 72E has a blade-shaped cross section and extends in the blade height direction D1. The ventral plate material 72E has a thickness in the blade thickness direction D3 thicker than that of the ventral plate material 72 of the first embodiment. The ventral plate member 72E has a thickness comparable to the thickness of the final blade body 7E in the blade thickness direction D3. The outer peripheral surface 720E of the ventral plate member 72E forms a part of the ventral side surface 702E and the dorsal side surface 701E on the front edge portion 7a side. In the ventral plate material 72E, a storage recess 88 capable of accommodating the back side plate material 71E is formed in a part of the outer peripheral surface 720E on the back side surface 701E side. The accommodating recess 88 is recessed from the outer peripheral surface 720E on the back side surface 701E side, leaving the leading edge portion 7a side. As a result, the outer peripheral surface 720E on the front edge portion 7a side of the ventral plate member 72E forms a part of the back side surface 701E. The ventral side surface 702E is a part of the outer peripheral surface 720E, and is a surface facing the side on which the dorsal plate member 71E is not arranged when the ventral plate member 72E is joined to the dorsal plate member 71E. Further, in the ventral plate material 72E, when the ventral plate material 72E is joined to the dorsal plate material 71E, it is a surface facing the inside of the wing body 7E and is located on the dorsal plate material 71E side with respect to the ventral side surface 702E. Is the inner side surface of the ventral plate material 720a.

The joint portion 73E joins the dorsal side plate material 71E and the ventral side plate material 72E. The joint portion 73E of the second embodiment is a portion where the dorsal plate member 71E and the ventral plate member 72E are joined by brazing, and is formed by solidifying the silver wax. The joint portion 73E joins the dorsal plate member 71E and the ventral plate member 72E without a gap in the blade height direction D1. In the wing body 7E of the second embodiment, the joint portion 73E joins the inner side surface 710a of the dorsal plate material and the inner side surface 720a of the ventral plate material.

Further, the blade body 7E of the second embodiment includes a first suction port 74E, a first drain flow path 75E, a first series passage 76E, a second drain flow path 77E, a second suction port 78E, and a second. It has a double passage 79E and a partition 80E.

The first suction port 74E of the second embodiment is formed only on the ventral side surface 702E. The first suction port 74E is formed in the upper half region of the ventral side surface 702E in the blade height direction D1. The first suction port 74E is formed as one long groove so as to extend in the blade height direction D1. The first suction port 74E is formed in a rectangular shape that is elongated and extends in the blade height direction D1 when the ventral side surface 702E is viewed from the blade thickness direction D3. The first suction port 74E is formed on the trailing edge portion 7b side of the center of the chord direction D2. The first suction port 74E is formed by the first suction port forming surface 81E formed on the back side plate material 71E and the ventral side plate material 72E. The first suction port 74E of the present embodiment is a first suction port that is recessed from the end surface 720b on the trailing edge 7b side of the ventral plate material 72E and the inner side surface 710a of the back side plate material 71E in a square groove shape. It is formed by a dorsal forming surface 810a. The first suction port dorsal side forming surface 810a is a vertically elongated square groove extending in the blade height direction D1. Therefore, in the present embodiment, the first suction port forming surface 81E forming the first suction port 74E includes the first suction port dorsal side forming surface 810a and the end surface 720b on the trailing edge portion 7b side of the ventral plate member 72E. Is.

The first drain flow path 75E is a space formed between the dorsal plate member 71E and the ventral plate member 72E. The first drain flow path 75E extends in the blade height direction D1 inside the blade body 7E. The first drain flow path 75E is formed between the back side plate material 71E and the ventral plate material 72E by the first drain flow path forming surface 82E formed on the inner side surface 710a of the back side plate material and the inner side surface 720a of the ventral side plate material, respectively. ing. The first drain flow path 75E of the second embodiment is formed by being recessed from the inner side surface 720a of the ventral plate material. The first drain flow path 75E is formed by a back side plate material inner side surface 710a and a first drain flow path ventral side forming surface 820b recessed from the ventral plate material inner side surface 720a. The ventral forming surface 820b of the first drain flow path of the second embodiment is recessed so as to form a concave curved surface from the inner surface 720a of the ventral plate material. Therefore, the first drain flow path forming surface 82E forming the first drain flow path 75E in the second embodiment is a part of the inner side surface 710a of the dorsal plate material and the first drain flow path ventral side forming surface 820b. ..

A plurality of the first series passages 76E are formed inside the blade body 7E apart from each other in the blade height direction D1. The plurality of first series passages 76E are formed so as not to be connected to each other in the blade height direction D1 between the first suction port 74E and the first drain flow path 75E. The first series passage 76E is a space formed between the dorsal plate member 71E and the ventral plate member 72E. The first series passage 76E is formed between the back side plate material 71E and the ventral plate material 72E by the first series passage forming surface 83E formed on the inner side surface 710a of the back side plate material and the inner side surface 720a of the ventral side plate material, respectively. .. The first series passage 76E is formed by being recessed from the inner side surface 710a of the back side plate material. The first series passage 76E of the second embodiment includes a first series passage back side forming surface 830a which is recessed from the back side plate material inner side surface 710a of the back side plate material 71E in a square groove shape, and a ventral plate material inner side surface 720a. Is formed by. The first series passage dorsal side forming surface 830a is a surface forming a plurality of angular grooves formed apart from each other in the blade height direction D1. The plurality of first series passage dorsal forming surfaces 830a communicate with the first suction port dorsal forming surface 810a on the trailing edge portion 7b side. Therefore, the first series passage forming surface 83E forming the first series passage 76E in the second embodiment is a part of the first series passage dorsal side forming surface 830a and the ventral plate material inner side surface 720a.

The second drain flow path 77E is formed on the leading edge portion 7a side of the first drain flow path 75E. The second drain flow path 77E is a space formed between the dorsal plate member 71E and the ventral plate member 72E. The second drain flow path 77E extends in the blade height direction D1 inside the blade body 7E. The second drain flow path 77E is formed between the back side plate material 71E and the ventral plate material 72E by the second drain flow path forming surface 84E formed on the inner side surface 710a of the back side plate material and the inner side surface 720a of the ventral side plate material, respectively. ing. The second drain flow path 77E of the second embodiment is formed by being recessed from the inner side surface 720a of the ventral plate material. The second drain flow path 77E is formed by a part of the inner side surface 710a of the back side plate material and the ventral side forming surface 840b of the second drain flow path recessed from the inner side surface 720a of the ventral side plate material. Therefore, the second drain flow path forming surface 84E forming the second drain flow path 77E in the present embodiment is a part of the inner side surface 710a of the dorsal plate material and the second drain flow path ventral side forming surface 840b.

The second suction port 78E of the second embodiment is formed only on the back side surface 701E. The second suction port 78E is formed in the upper half region of the dorsal side surface 701. The second suction port 78E is formed as one long groove so as to extend in the blade height direction D1. The second suction port 78E is formed in a rectangular shape that is elongated in the blade height direction D1 when the dorsal side surface 701E is viewed from the blade thickness direction D3. The second suction port 78E is formed on the leading edge portion 7a side of the center of the chord direction D2. The second suction port 78E is formed by the second suction port forming surface 85E formed on the back side plate member 71E and the ventral side plate member 72E. The second suction port 78E of the present embodiment is formed by an end surface 710b on the front edge portion 7a side of the back side plate material 71E and a second suction port ventral side forming surface 850b recessed from the ventral plate material inner side surface 720a of the ventral plate material 72E. It is formed. The ventral forming surface of the second suction port 850b is a surface forming a plurality of square grooves formed apart from each other in the blade height direction D1. Therefore, in the present embodiment, the second suction port forming surface 85E forming the second suction port 78E is an end surface 710b on the front edge portion 7a side of the dorsal plate member 71E and a second suction port ventral side forming surface 850b. ..

A plurality of second passages 79E are formed inside the blade body 7E apart from each other in the blade height direction D1. The second communication passage 79E communicates the second suction port 78E and the second drain flow path 77E in a state of being independent of each other. The second connecting passage 79E of the present embodiment is formed between the back side plate material 71E and the ventral plate material 72E by the second connecting passage forming surface 86E formed on the inner side surface 710a of the back side plate material and the inner side surface 720a of the ventral side plate material, respectively. It is formed. The second passage 79E is formed by being recessed from the inner side surface 710a of the dorsal plate material and the inner side surface 720a of the ventral plate material, respectively. The second passage forming surface 86E of the second embodiment is formed by a second passage back side forming surface 860a which is recessed from the inner surface 710a of the back side plate material in a square groove shape, and a second suction port ventral side forming surface 850b. It is formed. The dorsal side forming surface 860a of the second continuous passage is a surface forming a plurality of square grooves formed apart from each other in the blade height direction D1. The dorsal forming surface 860a of the second passage is formed so that the position of the blade height direction D1 is the same as the ventral forming surface 850b of the second suction port. The plurality of second communication passage back side forming surfaces 860a communicate with the end surface 710b on the front edge portion 7a side of the back side plate member 71E on the front edge portion 7a side. Therefore, the second passage forming surface 86E forming the second passage 79E in the second embodiment is the second passage back side forming surface 860a and the second suction port ventral side forming surface 850b.

The partition portion 80E partitions the first drain flow path 75E and the second drain flow path 77E so as to be independent of each other inside the blade main body 7E. The partition portion 80E is a region where the dorsal plate member 71E and the ventral plate member 72E are joined between the first drain flow path 75E and the second drain flow path 77E. The partition portion 80E isolates the first drain flow path 75E and the second drain flow path 77E over the entire area in the blade height direction D1. The partition portion 80E of the present embodiment is formed by a joint portion 73E in which the inner side surface 710a of the dorsal plate material and the inner side surface 720a of the ventral plate material are joined.

Next, the method for manufacturing the steam turbine blade (static blade 2E) of the second embodiment described above will be described. In the steam turbine blade manufacturing method S1, a flat plate-shaped dorsal plate member 71E and a ventral plate member 72E having a rectangular cross section are prepared in the preparation step S2.

After that, in the removing step S31, as shown in FIGS. 13 and 14, the dorsal plate material 71E and the ventral plate material 72E are scraped by grinding or cutting to partially remove them. In the removal step S31, the first suction port forming surface 81E, the first drain flow path forming surface 82E, the first series passage forming surface 83E, the second drain flow path forming surface 84E, the second suction port forming surface 85E, and the second series. The passage forming surface 86E is formed.

Specifically, the case of processing the back plate material 71E will be described. As shown in FIG. 13, in the removal step S31 of the second embodiment, the plate is formed so that when the dorsal plate member 71E is combined with the ventral plate member 72E, a part of the trailing edge portion 7b and the dorsal side surface 701E is formed. Unnecessary parts are scraped and removed from the shaped dorsal plate material 71E. At this time, in the removal step S31, the worker scrapes the trailing edge portion 7b side of the inner side surface 710a of the back side plate material to form the first suction port back side forming surface 810a. In the removal step S31, the worker further scrapes a part of the inner side surface 710a of the back side plate material so as to communicate with the groove formed by the back side forming surface 810a of the first suction port, so that the back side plate material 71E is in the first series. A passage dorsal forming surface 830a is formed. In the removal step S31, the worker scrapes the front edge portion 7a side of the inner side surface 710a of the back side plate material to form the second connecting passage back side forming surface 860a as the second connecting passage forming surface 86E.

Next, a case where the ventral plate material 72E is processed will be described. As shown in FIG. 14, in the removal step S31 of the present embodiment, when the dorsal plate member 71E is combined with the ventral plate member 72E, a part of the leading edge portion 7a, the dorsal side surface 701E, and the ventral side surface 702E are formed. In addition, an unnecessary portion is scraped off from the plate-shaped ventral plate material 72E. At this time, in the removal step S31, the worker scrapes the trailing edge portion 7b side of the ventral plate member 72E to form a smooth end surface 720b corresponding to the shape of the first suction port dorsal side forming surface 810a. In the removal step S31, the worker scrapes the inner side surface 720a of the ventral plate material to form the first drain flow path ventral side forming surface 820b on the ventral plate material 72E. In the removal step S31, the operator scrapes the inner side surface 720a of the ventral plate material near the middle of the chord direction D2, which is on the leading edge portion 7a side of the ventral side forming surface 820b of the first drain flow path, so that the ventral plate material 72E A second drain flow path ventral forming surface 840b is formed on the surface. Further, the operator scrapes the inner side surface 720a of the ventral plate material on the front edge portion 7a side of the ventral side forming surface 840b of the second drain flow path so as to be connected to the ventral forming surface 840b of the second drain flow path. The side plate material 72E second suction port ventral side forming surface 850b is formed.

After that, the back side plate member 71E is bent in the bending step S32, so that a part of the back side surface 701E is formed on the back side plate member 71E. Further, by bending the ventral plate material 72E, a part of the dorsal side surface 701E and the ventral side surface 702E are formed on the ventral side plate material 72E.

In the joining step S4, the first suction port 74E, the first drain flow path 75E, the first series passage 76E, the second drain flow path 77E, the second suction port 78E, and the second continuous passage 79E are connected to the dorsal plate material 71E on the ventral side. The dorsal plate material 71E and the ventral plate material 72E are joined so as to be formed between the plate material 72E. Specifically, in the joining step S4, the dorsal plate material 71E is formed so as to form the first suction port 74E between the first suction port dorsal side forming surface 810a and the end surface 720b on the trailing edge portion 7b side of the ventral plate material 72E. And the ventral plate material 72E are joined. Further, in the joining step S4, the dorsal plate material 71E and the ventral plate material 71E are formed so as to form the second suction port 78E between the ventral side forming surface 850b of the second suction port and the end surface 710b on the front edge portion 7a side of the dorsal plate material 71E. 72E is joined. Further, in the joining step S4, the inner side surface of the dorsal plate material 710a and the inner side surface of the ventral plate material 720a are joined between the second drain flow path forming surface 84E and the first drain flow path forming surface 82E. As a result, in the joining step S4, a partition portion 80E that partitions the second drain flow path 77E and the first drain flow path 75E so as to be independent of each other is formed as the joining portion 73E.

In the stationary blade 2E of the second embodiment as described above, a plurality of first series passages 76E are formed in a state of being independent of each other, as in the first embodiment. As a result, the drain can be efficiently flowed from the first suction port 74E to the first drain flow path 75E. Similarly, a plurality of second passages 79E are formed in a state of being independent of each other. As a result, the drain can be efficiently flowed from the second suction port 78E to the second drain flow path 77E.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the configurations and combinations thereof in the respective embodiments are examples, and the configurations are added or omitted within the range not deviating from the gist of the present invention. , Replacements, and other changes are possible. Further, the present invention is not limited to the embodiments, but only to the scope of claims.

The first suction ports 74, 74A, 74E and the second suction ports 78, 78E are not limited to being formed in a shape continuous with the blade height direction D1. If the first suction ports 74, 74A, 74E and the second suction ports 78, 78E are connected to a plurality of first series passages 76, 76E and second series passages 79, 79E, they cannot be connected to the blade height direction D1. It may be formed as a continuous slit.

Further, the first drain flow paths 75, 75B, 75C, 75E, the first suction ports 74, 74A, 74E, the second drain flow paths 77, 77E, and the second suction ports 78, 78E are at least D1 in the blade height direction. It suffices if it is formed in the upper half region. Therefore, the first drain flow paths 75, 75B, 75C, 75E, and the second drain flow paths 77, 77E penetrate the blade body 7 so as to communicate with the inner shroud 21 and the outer shroud 22, and the blade height of the blade body. It is not limited to being formed in the entire area in the vertical direction.

Further, the first suction ports 74, 74A, 74E and the second suction ports 78, 78E are not limited to being formed in the entire upper half region of the blade height direction D1. The first suction ports 74, 74A, 74E and the second suction ports 78, 78E may be formed only in a part of the tip side of the blade surfaces 70, 70E.

Further, the first suction ports 74, 74A and 74E are not limited to being formed only on the ventral side surfaces 702, 702C and 702E. In particular, when the second suction ports 78 and 78E are not formed as in the third modification and the fourth modification, the first suction ports 74, 74A and 74E are formed on the back side surfaces 701, 701C and 701E. May be good.

Further, the first series passage forming surfaces 83, 83E are formed on the inner side surfaces 71a, 710a and the ventral plate members 72, 72A, 72B of the dorsal plate members 71, 71A, 71B, 71E, as in the embodiments and modifications. It is not limited to being formed so as to be recessed from only one of the inner side surfaces 72a and 720a of the ventral plate material of 72E. The first series passage forming surfaces 83 and 83E are the dorsal plate material inner side surfaces 71a and 710a and the ventral plate materials 72 of the dorsal plate materials 71, 71A, 71B and 71E as in the first drain flow path forming surface 82 of the embodiment. It may be formed so as to be recessed from both the inner side surfaces 72a and 720a of the ventral plate members of 72A, 72B and 72E.

Further, the first drain flow path forming surface 82 is both the inner side surface 71a of the dorsal plate material 71, 71A, 71B and the inner side surface 72a of the ventral plate material 72, 72A, 72B of the ventral plate material 72, 72A, 71B as in the embodiment. It is not limited to being formed so as to be recessed from the surface. The first drain flow path forming surface 82 is formed on the inner side surfaces 71a, 710a of the dorsal plate members 71, 71A, 71B, 71E and the ventral plate inner surfaces 72a, 720a of the ventral plate members 72, 72A, 72B, 72E. It may be formed so as to be recessed from only one of them.

Further, the second drain flow path forming surface 84 is not limited to being formed in the bending step S32 as in the embodiment. Similar to the first drain flow path forming surface 82, the second drain flow path forming surface 84 is the back side plate material inner side surface 71a and the ventral side plate materials 72, 72A, 72B of the back side plate materials 71, 71A, 71B in the removing step S31. It may be formed by shaving from the inner side surface 72a of the ventral plate material so as to be recessed.

Further, the first drain flow path forming surface 82 is not limited to being formed in the removing step S31 as in the embodiment. For example, the first drain flow path forming surface 82 may be formed in the bending step S32 in the same manner as the second drain flow path forming surface 84.

100 ... Steam turbine S ... Steam Ac ... Axial line Da ... Axial direction Dc ... Circumferential direction Dr ... Radial direction 1 ... Casing 1 ... Steam inlet 12 ... Steam outlet 2, 2E ... Static blade 3 ... Rotor 5 ... Rotor shaft 6 ... Moving blade 4 ... Bearing part 41 ... Journal bearing 42 ... Thrust bearing 7, 7A, 7B, 7D, 7E ... Wing body D1 ... Wing height direction D2 ... Wing chord direction D3 ... Wing thickness direction 70, 70E ... Wing surface 701, 701C, 701E ... Back side surface 702, 702C, 702E ... Ventral side surface 7a ... Front edge portion 7b ... Rear edge portion 71, 71A, 71B, 71E ... Back side plate material 71a, 710a ... Back side plate material inner surface 72, 72A, 72B, 72E ... Ventral plate material 72a, 720a ... Ventral plate material inner surface 720E ... Outer surface 73, 73E ... Joint portion 74, 74A, 74E ... First suction port 75, 75B, 75C, 75E ... First drain flow path 751 ... Squeezing portion 76 , 76E ... First series passage 77, 77E ... Second drain flow path 78, 78E ... Second suction port 79, 79E ... Second continuous passage 80, 80E ... Partition portion 81, 81E ... First suction port forming surface 81a, 91a, 810a ... First suction port dorsal side forming surface 82, 82E ... First drain flow path forming surface 82a, 92a, 820a ... First drain flow path dorsal side forming surface 82b, 92b, 820b ... First drain flow path antinode Side forming surface 83, 83E ... First series passage forming surface 83a, 830a ... First series passage dorsal side forming surface 83b ... First series passage ventral side forming surface 84, 84E ... Second drain flow path forming surface 84a ... Second Drain flow path dorsal forming surface 84b, 840b ... Second drain flow path ventral forming surface 850b ... Second suction port ventral forming surface 860a ... Second continuous passage dorsal forming surface 88 ... Accommodating recess 21 ... Inner shroud 210 ... Inside Discharge flow path 22 ... Outer shroud 220 ... Outer discharge flow path C1 ... Main flow path S1 ... Steam turbine blade manufacturing method S2 ... Preparation process S3 ... Machining process S31 ... Removal process S32 ... Bending process S4 ... Joining process 91b ... First suction Oral ventral forming surface 99 ... Wing forming plate material

Claims (20)

A first drain flow path extending in the blade height direction inside the blade body having a blade surface extending in the blade height direction, and a first drain flow path inside the blade body in front of the blade body. The second drain flow path extending in the blade height direction on the edge side, the first suction port and the second suction port opened on the blade surface, the first suction port and the first drain flow. A method for manufacturing a steam turbine blade having a first series passage for communicating with a road and a second series passage for communicating the second suction port and the second drain flow path.
A preparatory step for preparing a dorsal plate material capable of forming a convex dorsal side surface as the wing surface and a ventral plate material capable of forming a concave ventral side surface as the wing surface.
A processing process for processing the dorsal plate material and the ventral plate material, and
The joining step of joining the back side plate material and the ventral side plate material so as to form the first drain flow path and the second drain flow path between the back side plate material and the ventral side plate material is included. ,
The processing process is
A removal step of scraping off the dorsal plate material and a part of the ventral plate material, and
Including a bending step of bending the dorsal plate material and the ventral plate material.
In the removal step, the first drain flow path forming surface forming the first drain flow path and the second drain flow path forming surface forming the second drain flow path are formed on the back plate material and the ventral side. Formed on both boards,
In the bending step, the dorsal side surface is formed on the dorsal plate material, and the ventral side surface is formed on the ventral plate material.
In the joining step, the dorsal plate material and the ventral plate material are joined between the second drain flow path forming surface and the first drain flow path forming surface, and the second drain flow path and the first one are joined. A method for manufacturing a steam turbine blade that forms a partition portion by the above-mentioned joint that partitions the drain flow path so as to be independent of each other. In the removal step, when the back side plate material and the ventral side plate material are joined, the inner side surface of the back side plate material located on the ventral side plate material side of the back side plate material and the abdomen as than the ventral aspect at the side plate member recessed from at least one of the ventral plate inner side surface located on the back side plate side, the steam turbine blade according to claim 1, wherein the first drain channel formed surface is formed Production method. In the removal step, when the back side plate material and the ventral side plate material are joined, the inner side surface of the back side plate material located on the ventral side plate material side of the back side plate material and the abdomen than the ventral aspect at the side plate so as to be recessed from at least one of the ventral plate inner side surface located on the back side plate side, claim 1 first communication passage forming surface to form said first communication passage is formed or The method for manufacturing a steam turbine blade according to claim 2. In the removal step, the surface for forming the first suction port is located closer to the ventral plate material than the dorsal side surface when the dorsal plate material is joined to the ventral plate material. A dorsal forming surface of the first suction port that is recessed from the inner surface of the dorsal plate material is formed.
In the joining step, the dorsal plate material and the ventral plate material are formed so as to form the first suction port between the dorsal surface of the first suction port and the end surface on the trailing edge side of the ventral plate material. The method for manufacturing a steam turbine blade according to any one of claims 1 to 3, wherein the steam turbine blades are joined. In the removal step, when the back side plate material and the ventral side plate material are joined, the inner side surface of the back side plate material located on the ventral side plate material side of the back side plate material and the abdomen as than the ventral aspect at the side plate member recessed from at least one of the ventral plate inner side surface located on the back side plate side, either one of claims 1 to 4, wherein the second drain channel formation surface is formed The method for manufacturing a steam turbine blade according to item 1. In the removal step, when the back side plate material and the ventral side plate material are joined, the inner side surface of the back side plate material located on the ventral side plate material side of the back side plate material and the abdomen as than the ventral aspect at the side plate member recessed from at least one of the ventral plate inner side surface located on the back side plate side, from claim 1 second communication passage forming surface for forming the second communication passage is formed The method for manufacturing a steam turbine blade according to any one of claim 5. In the removal step, as the second suction port forming surface forming the second suction port, when the ventral plate material is joined to the dorsal plate material, it is located closer to the dorsal plate material side than the ventral side surface. A ventral forming surface of the second suction port, which is recessed from the inner surface of the ventral plate material, is formed.
In the joining step, the ventral plate material and the dorsal plate material form the second suction port between the ventral surface of the second suction port and the end surface on the front edge side of the dorsal plate material. The method for manufacturing a steam turbine blade according to any one of claims 1 to 6, which is joined. The method for manufacturing a steam turbine blade according to any one of claims 1 to 3, wherein in the bending step, the second drain flow path forming surface is formed together with the back side surface and the ventral side surface. It has a wing body with a wing surface that extends in the wing height direction.
The wing body
A dorsal plate material forming a convex dorsal side surface as the wing surface,
A ventral plate material forming a concave ventral side surface as the wing surface,
A plurality of joints that join the dorsal plate material and the ventral plate material,
A first drain flow path extending in the blade height direction between the dorsal plate material and the ventral plate material,
A second drain flow path extending in the blade height direction between the dorsal plate material and the ventral plate material and formed on the front edge side of the blade body with respect to the first drain flow path.
The first suction port and the second suction port opened on the wing surface,
A first series of passages communicating the first suction port and the first drain flow path,
A second communication passage that communicates the second suction port and the second drain flow path, and
It has a partition portion for partitioning the second drain flow path and the first drain flow path so as to be independent of each other inside the blade body.
One of the joints is a steam turbine blade that forms the partition by the joint. The steam turbine blade according to claim 9, wherein the first suction port is formed on a concave ventral side surface of the blade surface. The first drain flow path is located on the inner side surface of the dorsal plate material located on the ventral side plate side of the dorsal side plate material and on the dorsal side plate material side of the ventral side plate material. It is formed between the back side plate material and the ventral side plate material by the first drain flow path forming surface formed on the inner side surface of the ventral side plate material.
The steam turbine blade according to claim 9 or 10, wherein the first drain flow path forming surface is formed by being recessed from at least one of the inner side surface of the dorsal plate material and the inner side surface of the ventral plate material. The first series of passages are located on the inner side surface of the dorsal plate material located on the ventral side plate side of the dorsal side plate material and on the dorsal side plate material side of the ventral side plate material. It is formed between the dorsal plate material and the ventral plate material by the first series of passage forming surfaces formed on the inner side surface of the ventral plate material, respectively.
The steam turbine blade according to any one of claims 9 to 11, wherein the first series passage forming surface is formed by being recessed from at least one of the inner side surface of the dorsal plate material and the inner side surface of the ventral plate material. .. The first suction port is
Extending in the blade height direction and opening at the blade surface,
In the dorsal plate material, the first suction port dorsal side forming surface recessed from the inner side surface of the dorsal plate material located on the ventral side plate material side with respect to the dorsal side surface, and the end surface on the trailing edge side of the ventral side plate material. Formed,
The ninth series of passages is claimed from claim 9, wherein a plurality of the first series passages are formed apart from each other in the blade height direction, and the first suction port and the first drain flow path are communicated with each other in a state of being independent of each other. Item 12. The steam turbine blade according to any one of items 12. The steam turbine blade according to any one of claims 9 to 13, wherein the second suction port is formed on a convex back surface of the blade surface. The steam turbine blade according to any one of claims 9 to 14, wherein the second suction port is formed in the upper half region of the blade surface in the blade height direction. The second drain flow path is located on the inner side surface of the ventral plate material located on the dorsal side plate side of the ventral side plate material and on the ventral side plate material side of the dorsal side plate material. The second drain flow path forming surface formed on the inner side surface of the back side plate material is formed between the ventral side plate material and the back side plate material.
The steam turbine according to any one of claims 9 to 15, wherein the second drain flow path forming surface is formed by being recessed from at least one of the inner side surface of the ventral plate material and the inner side surface of the back side plate material. Wings. The second passage is located on the inner side surface of the ventral plate material located closer to the dorsal side plate material than the ventral side surface in the ventral side plate material, and on the ventral side plate material side of the dorsal side plate material. It is formed between the ventral plate material and the back plate material by the second passage forming surface formed on the inner side surface of the back plate material, respectively.
The steam turbine blade according to any one of claims 9 to 16, wherein the second passage forming surface is formed by being recessed from at least one of the inner side surface of the ventral plate material and the inner side surface of the back side plate material. .. The second suction port is a surface formed on the ventral side of the second suction port, which is recessed from the inner side surface of the ventral plate material located on the dorsal side plate material side of the ventral side surface in the ventral plate material.
The steam turbine blade according to any one of claims 9 to 17, which is formed by an end surface of the dorsal plate material on the leading edge side. The second suction port extends in the blade height direction and opens at the blade surface.
According to claim 9, a plurality of the second connecting passages are formed apart from each other in the blade height direction, and the second suction port and the second drain flow path are communicated with each other in a state of being independent of each other. Item 12. The steam turbine blade according to any one of items 18. A rotor shaft that rotates around an axis and
A steam turbine comprising the steam turbine blade according to any one of claims 9 to 19, which is arranged so as to surround the rotor shaft.

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