JPH1122410A - Steam turbine moisture separator and method of manufacturing the same - Google Patents

Abstract

(57) An object of the present invention is to provide a steam turbine moisture separator and a method for manufacturing the same, which reliably removes a water film flowing along an outer peripheral wall of a diaphragm outer ring. A moisture separating device for a steam turbine according to the present invention is formed by combining an outer peripheral wall suction port (32) formed in an outer peripheral wall (20) of a diaphragm outer ring (21) with an elongated hole (36) and an opening (35). . Further, in the method for manufacturing a moisture separation device for a steam turbine according to the present invention, the diaphragm outer ring 21 having the outer peripheral wall suction port 32, the turbine nozzle 24, and the diaphragm inner ring 23 are manufactured by a precision casting method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moisture separating device for a steam turbine, and more particularly to a steam separating device that forms a suction port on an outer peripheral wall supporting a turbine nozzle or a turbine nozzle itself to separate turbine driving steam and drain. The present invention relates to a turbine moisture separation device and a manufacturing method.

[0002]

2. Description of the Related Art In a low-pressure section of a nuclear turbine, a geothermal turbine or a thermal turbine, the temperature of turbine driven steam is controlled.
Since the pressure is relatively low, a part of the pressure is condensed during the expansion work and becomes a drain, which flows to the inner and outer peripheral walls of the steam passage and the turbine blade.

[0003] The drain flowing through the inner and outer peripheral walls of the steam passage and the turbine blades eventually grows into water droplets having a relatively large particle size, causing erosion of the leading edge of the turbine blades and lowering blade efficiency. .

[0004] As a means for removing the drain causing such an adverse effect, for example, a technique disclosed in Japanese Patent Publication No. 49-9522 has already been disclosed.

According to this technique, as shown in FIGS. 23 and 24, blade suction ports 4 and 5 are formed on a back surface 2 and a belly surface 3 of a turbine nozzle 1 and a diaphragm outer ring 6 and a diaphragm 6 supporting both ends of the turbine nozzle 1 are provided. The inside of the diaphragm inner ring 7 is formed as spaces 8 and 9, and the drain is sucked and sucked at the outer wall suction port 11 formed on the outer wall 10 of the diaphragm outer ring 6 and the blade suction ports 4 and 5 formed on the turbine nozzle 1. Drain is collected in the space 8 of the diaphragm outer ring 6 via the wing space 12, and is discharged from here to a condenser (not shown).

According to this technique, the wing suction ports 4 and 5 are formed on the top side of the front edge 13 of the back surface 2 and the top side of the rear edge 14 of the abdominal surface 3 where the drain is relatively easily collected. The drain can be removed from the eyes, thereby reducing the adverse effect of the drain on the adjacent turbine blade (not shown).

[0007]

The output of a recent steam turbine plant is increasing, and the flow rate of turbine driving steam is also increasing. At present, when the flow rate of turbine drive steam is increasing, it is already reaching a limit in removing a large amount of drain in the conventional moisture separation apparatus shown in FIGS.

FIG. 25 shows an expansion diagram of a steam turbine in a commercial thermal power plant, in which the vertical axis indicates specific enthalpy I and the horizontal axis indicates entropy S. In the figure,
The X curve indicates dryness, the T curve indicates temperature, and the P curve indicates pressure. In addition, the point D is a paragraph before the last paragraph (hereinafter, referred to as a paragraph).
L-1) steam state quantity at the inlet of the turbine nozzle,
Point E is the steam state quantity at the exit of the L-1 turbine nozzle, point F is the steam state quantity at the exit of the L-1 turbine blade, and point G is the turbine nozzle of the last paragraph (hereinafter referred to as L-0). The point H indicates the steam state quantity at the outlet of the turbine moving blade of L-0.

FIG. 25 shows a state in which turbine drive steam loses its thermal energy due to expansion.
Now, even if the turbine drive steam flowing into the L-1 turbine nozzle is in a dry state, it loses heat energy while passing points E to G and becomes wet. At the point H where the turbine driving steam has passed through the outlet of the turbine blade of L-0, the state of the wetness [(1-x) of about 10% with respect to the dry state at the inlet of the turbine nozzle of L-1 ].

However, the turbine drive steam does not immediately start condensing just because it becomes wet, but expands in a non-equilibrium state to a wetness of 3 to 5%, after which water droplets are generated. The initial water droplets are generated from the L-1 turbine blade 15 as shown in FIG. 26, and have a small particle size of 0.1 to 1 μm. Further, while the turbine drive steam takes a trajectory as a turbine drive steam streamline K as shown by a dashed line in the figure, the water droplets as shown by a solid line in the figure show an outer peripheral wall 10 of the diaphragm outer ring 6 of L-0.
The trajectory as the water drop streamline L is taken. This trajectory is affected by the total force of the centrifugal force, the Coriolis force, and the steam force generated in the turbine moving blade 15 of L−1, and is affected by L-0.
Is considered to face the outer peripheral wall 10 of the diaphragm outer ring 6.

As described above, the water droplet taking the trajectory as the water droplet stream line L grows toward the turbine nozzle 1 of L-0,
L-0 adheres to the front edge 13 of the turbine nozzle 1 and eventually grows as a water film M. After the water film M reaches the trailing edge 14 of the turbine nozzle 1 while developing, the water film M is blown off by steam power, enters the turbine drive steam streamline K, and flows into the turbine blade 15 as a mist containing water droplets. The water droplets at this time are larger than at the beginning, and the particle size is 100 to
It is as large as 500 μm.

[0012] The water droplets thus grown greatly together with the turbine drive steam streamline K are combined with the leading edge 16 of the turbine blade 15.
And causes erosion at the leading edge 16 of the turbine blade 15 due to the collision energy.

When the wetness of the L-1 turbine nozzle, which is the source of water droplet generation, is observed in detail using a model turbine, the wetness is determined as shown in FIG. It is recognized that the outer peripheral wall 10 side of No. 6 is higher. Therefore, L-
In the turbine nozzle 1 of No. 0, as shown in FIG.
0.1 to 1.0 μm generated by one turbine blade 15
It is considered that about water droplets are collected together with the turbine drive steam streamline K and develop as a water film M.

As shown in FIG. 28, the water film M is formed by a water film M ₁ flowing from the front edge 13 of the turbine nozzle 1 along the back surface 2 and the abdominal surface 3 and the outer peripheral wall 10 of the diaphragm outer ring 6.
It is divided into a water film M ₂ flowing along the. Among them, the water film M ₁ flowing from the front edge 13 of the turbine nozzle 1 along the back surface 2 and the abdominal surface 3 is sucked by the blade suction ports 4 and 5 and does not flow to the trailing edge 14, whereas the diaphragm outer ring 6 When the water film M ₂ flowing along the outer peripheral wall 10 is sucked in the outer peripheral wall suction port 11, a part thereof jumps out and travels along the back surface 2 of the turbine nozzle 1 to the rear edge 14 as shown by a solid line in the drawing. Flowing. Water film M ₂ is the outer peripheral wall suction port 1
It is thought that the reason for jumping out of the nozzle 1 and flowing along the back surface 2 of the turbine nozzle 1 is due to the influence of the secondary flow vortex.

Generally, as shown in FIG. 29, the pressure distribution of the turbine nozzle 1 is high at the ventral surface 3 and low at the rear surface 2. For this reason, the turbine nozzle 1
As shown in FIG. 1, a pressing force N is generated from the belly surface 3 of one turbine nozzle 1a toward the back surface 2 of the adjacent turbine nozzle 1b based on the above-mentioned pressure difference. The pressing force N causes the outer peripheral wall 10 of the diaphragm outer ring 6 to move. A secondary flow vortex O is generated in the turbine drive steam flowing along the air.

The water film M ₂ affected by the secondary flow vortex O is:
As shown in FIG. 31, even if the gas flows into the inlet of the steam passage SP formed by one turbine nozzle 1 a and the adjacent turbine nozzle 1 b at a uniform streamline, the back surface 2 of the adjacent turbine nozzle 1 b may be halfway. It is drifting toward.

Therefore, in the conventional steam turbine moisture separation apparatus, when the flow rate of the turbine drive steam ST is relatively low, the influence of the secondary flow vortex O is small, and as shown in FIG. also sucks water film M ₂ in the outer peripheral wall suction port 11 formed in the wall 10 relatively good, recent as to high output, the flow rate of the turbine driving steam ST even come to a large amount of secondary flow vortices The influence of O also increases, and even if it looks as if it was once sucked in the outer peripheral wall suction port 11, it jumps out, flows toward the back surface 2 of the adjacent turbine nozzle 1b, and the separation of steam and drain is no longer at a limit. Was. Particularly, when the suction flow rate of water droplets at the outer peripheral wall suction port 11 is quantitatively observed by a model turbine,
Now, the end R on the back surface 2 side of the adjacent turbine nozzle 1b is set to the reference zero, the end S on the abdominal surface 3 side of one turbine nozzle 1a is set to 1.0, and the cross-sectional position P−
33. As shown in FIG. 33, the distribution of water droplets is highest at the cross-sectional position QQ, that is, 0.5 at the center, and the amount of water droplets is 1.5 times larger than the conventional one. Times to 3.0
It has increased twice.

The water film M ₂ in the cross section PP is, as shown in FIG. 34, after the turbine drive steam ST deflected by the secondary flow vortex O has been sucked in at the cross section position QQ. Therefore, the outer peripheral wall suction port 11 formed in the outer peripheral wall 10 of the diaphragm outer ring 6 can sufficiently suck the air.

However, the water film M _{2 at} the sectional position QQ
Has a water volume of 1.5 to 3.0 times the conventional amount, as described above.
As shown in FIG. 35, sufficient suction at the outer peripheral wall suction port 11 cannot be performed, resulting in an overflow.

As described above, when the flow rate of the turbine driving steam increases with the increase in the output of the steam turbine, it becomes difficult to separate the steam and the drain with the conventional technology, and as a result, the turbine rotor blades Erosion prevention has become insufficient, and there has been a demand for new technical improvements.

The present invention has been made in view of the above-mentioned circumstances, and by improving an outer peripheral wall suction opening formed in an outer peripheral wall of a diaphragm outer ring, a water film as a drain is reliably sucked without hitting. It is an object of the present invention to provide a steam turbine moisture separating apparatus and a method for manufacturing the same, which can prevent erosion of a turbine rotor blade.

[0022]

In order to achieve the above object, a moisture separating apparatus for a steam turbine according to the present invention has a diaphragm outer ring and a diaphragm forming an outer peripheral wall suction port. In a moisture separation device for a steam turbine, in which a turbine nozzle having blade suction ports formed on a back surface and a vent surface is fixed between the inner ring and the inner ring, the outer peripheral wall suction port is adjacent to a rear edge of one turbine nozzle from a vent surface side. An opening is formed at an intermediate portion of a long hole extending toward the back surface at the front edge of the turbine nozzle.

According to a second aspect of the present invention, there is provided a steam turbine moisture separating apparatus according to the present invention, wherein the long hole is formed in a slit shape.

According to a third aspect of the present invention, there is provided a steam turbine moisture separating apparatus according to the present invention, wherein the opening is formed in a circular shape and the entire length of the long hole is reduced. Where L is the width of the long hole, W is the width of the long hole, and B is the diameter of the long hole, the length ratio B of the long hole to the total length of the long hole is B
/ L is

## EQU31 ## While setting B / L in the range of 0.1 to 0.7, the opening width ratio B / W of the opening to the width of the slot is

## EQU32 ## B / W is set in the range of 1.5 to 3.0.

According to a fourth aspect of the present invention, there is provided a steam turbine moisture separating apparatus according to the present invention, wherein the opening is formed in a semicircular shape facing the downstream side of the turbine driving steam. When the length of the long hole is L, the width of the long hole is W, and the radius of the hole is B ₁ , the length ratio of the hole to the entire length of the long hole is 2B ₁ / L. ,

2B ₁ /L=0.1 to 0.7, while the opening width ratio B ₁ / W of the opening to the width of the slot is

## EQU34 ## This is set in the range of B ₁ /W=1.5 to 3.0.

In order to achieve the above object, in the steam turbine moisture separating apparatus according to the present invention, the opening is formed in a semicircular shape facing the upstream side of the turbine driving steam. At the same time, when the total length of the long hole is L, the width of the long hole is W, and the radius of the opening is B ₁ , the length ratio of the opening to the total length of the long hole 2B ₁ / L is:

## EQU35 ## While the value is set in the range of 2B ₁ /L=0.1 to 0.7, the opening width ratio B ₁ / W of the opening to the width of the elongated hole is:

36 is set in the range of B ₁ /W=1.5 to 3.0.

In order to achieve the above object, in the steam turbine moisture separating apparatus according to the present invention, the opening extends toward the upstream side and the downstream side of the turbine driving steam. together allowed to form a box shape, the total length of the long hole is L, the width of the long hole and is W, the length of the opening as L _1, the width of the aperture when the B _2, the apertures The length ratio L ₁ / L to the total length of the long hole is:

## EQU37 ## While L ₁ / L is set in the range of 0.1 to 0.7, the opening width ratio B ₂ / W of the opening to the width of the slot is

## EQU38 ## This is set in the range of B ₂ /W=1.5 to 3.0.

In order to achieve the above object, the moisture separating apparatus for a steam turbine according to the present invention, as described in claim 7, has an opening having a half-split box extending toward the upstream side of the turbine driving steam. And the length of the long hole is L, the width of the long hole is W, and the length of the opening is L ₁
When the width of the opening is B ₃ , the length ratio L ₁ / L of the opening to the entire length of the long hole is:

L ₁ /L=0.1-0.7 While the opening width ratio B ₃ / W of the opening to the width of the slot is:

## EQU40 ## This is set in the range of B ₃ /W=1.5 to 3.0.

In order to achieve the above object, in the steam turbine moisture separating device according to the present invention, the opening is formed in a half-split box extending toward the downstream side of the turbine driving steam. And the length of the long hole is L, the width of the long hole is W, and the length of the opening is L ₁
When the width of the opening is B ₃ , the length ratio L ₁ / L of the opening to the entire length of the long hole is:

Equation 41] While set in the range of L ₁ /L=0.1~0.7, opening width ratio B ₃ / W to the width of the slots of said apertures,

42 is set in the range of B ₃ /W=1.5 to 3.0.

In order to achieve the above object, in the steam turbine moisture separating apparatus according to the present invention, the opening is expanded toward the upstream side and the downstream side of the turbine driving steam. When the length of the long hole is L, the width of the long hole is L ₂ , the width of the long hole is B _4, and the width of the long hole is B ₄ , The length ratio L ₂ / L of the hole to the total length of the slot is

(43) While L ₂ / L is set in the range of 0.1 to 0.7, the opening width ratio B ₄ / W of the opening to the width of the slot is

## EQU44 ## This is set in the range of B ₄ /W=1.5 to 3.0.

In order to achieve the above object, in the steam turbine moisture separating apparatus according to the present invention, the opening is expanded toward the upstream side and the downstream side of the turbine driving steam. When the length of the long hole is L, the width of the long hole is L, the length of the above hole is L _3, and the width of the above hole is B ₅ , The length ratio L ₃ / L of the opening to the total length of the slot is:

## EQU45 ## While L ₃ / L is set in the range of 0.1 to 0.7, the opening width ratio B ₅ / W of the opening to the width of the elongated hole is:

46 is set in the range of B ₅ /W=1.5 to 3.0.

In order to achieve the above object, the moisture separating apparatus for a steam turbine according to the present invention, as described in claim 11, has openings extending toward the upstream side and the downstream side of the turbine driving steam. When formed in a diamond shape, the total length of the long hole is L, the width of the long hole is W, the length of the above hole is L _4, and the width of the above hole is B ₆ , The length ratio L ₄ / L to the total length of the long hole is:

L ₄ /L=0.1-0.7 While the opening width ratio B ₆ / W of the opening to the width of the long hole is:

48 is set in the range of B ₆ /W=1.5 to 3.0.

In order to achieve the above object, a moisture separating device for a steam turbine according to the present invention has a cross section having a mountain-shaped cross section extending toward the upstream side of the turbine driving steam. together allowed to form on the entire length of the long hole is L, the width of the long hole and is W, when the length of the aperture and L _5, the width of the aperture and B _7, the length of the aperture The length ratio L ₅ / L to the total length of the hole is

L ₅ /L=0.1-0.7 While the opening width ratio B ₇ / W of the opening to the width of the slot is:

## EQU50 ## This is set in the range of B ₇ /W=1.5 to 3.0.

In order to achieve the above object, the moisture separating device for a steam turbine according to the present invention, as described in claim 13, wherein the opening has a mountain-shaped cross section extending toward the downstream side of the turbine driving steam. together allowed to form on the entire length of the long hole is L, the width of the long hole and is W, when the length of the aperture and L _5, the width of the aperture and B _7, the length of the aperture The length ratio L ₅ / L to the total length of the hole is

L ₅ /L=0.1 to 0.7, while the opening width ratio B ₇ / W of the opening to the width of the slot is

52 is set in the range of B ₇ /W=1.5 to 3.0.

In order to achieve the above object, the moisture separating apparatus for a steam turbine according to the present invention, as described in claim 14, wherein the opening has a half bulging toward the upstream side of the turbine driving steam. When the length of the long hole is L, the width of the long hole is W, the length of the above hole is L _6, and the width of the above hole is B ₈ , The length ratio L ₆ / L to the total length of the long hole is:

L ₆ /L=0.1-0.7 While the opening width ratio B ₈ / W of the opening to the width of the long hole is:

(Equation 54) It is set in the range of B ₈ /W=1.5 to 3.0.

In order to achieve the above object, the moisture separating apparatus for a steam turbine according to the present invention, as described in claim 15, is characterized in that the opening has a half-bulge bulging toward the downstream side of the turbine driving steam. When the length of the long hole is L, the width of the long hole is W, the length of the above hole is L _6, and the width of the above hole is B ₈ , The length ratio L ₆ / L to the total length of the long hole is:

L ₆ /L=0.1-0.7 While the opening width ratio B ₈ / W of the opening to the width of the slot is:

56 is set in the range of B ₈ /W=1.5 to 3.0.

In order to achieve the above object, the moisture separating apparatus for a steam turbine according to the present invention has a structure in which the opening is formed by a half-bulge bulging toward the upstream side of the turbine driving steam. together allowed to form in an oval shape, when the entire length of the long hole is L, the width of the long hole and is W, the length of the aperture and L _7, the width of the aperture and B _9, the apertures Is the length ratio L ₇ / L to the total length of the long hole,

L ₇ /L=0.1-0.7 While the opening width ratio B ₉ / W of the opening to the width of the slot is:

(Equation 58) B ₉ /W=1.5 to 3.0

In order to achieve the above object, the moisture separating apparatus for a steam turbine according to the present invention, as described in claim 17, has the opening formed by a half bulging toward the downstream side of the turbine driving steam. together allowed to form in an oval shape, when the entire length of the long hole is L, the width of the long hole and is W, the length of the aperture and L _7, the width of the aperture and B _9, the apertures Is the length ratio L ₇ / L to the total length of the long hole,

L ₇ /L=0.1-0.7 While the opening width ratio B ₉ / W of the opening to the width of the elongated hole is:

## EQU60 ## This is set in the range of B ₉ /W=1.5 to 3.0.

In order to achieve the above object, the moisture separating device for a steam turbine according to the present invention is provided with an outer peripheral wall suction port formed by combining a long hole and an opening. The outer ring of the diaphragm, the turbine nozzle and the inner ring of the diaphragm with the blade suction ports on the back and abdominal surfaces,
This is a method produced by the precision casting method.

[0040]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a steam turbine according to an embodiment of the present invention;

FIG. 1 is a schematic longitudinal sectional view showing a first embodiment of a moisture separation device for a steam turbine according to the present invention.

The turbine nozzle 2 is provided between a diaphragm outer ring 21 forming an outer peripheral wall 20 of the steam passage SP and a diaphragm inner ring 23 forming an inner peripheral wall 22 of the steam passage SP.
4 are joined and fixed by welding or casting.

The turbine nozzle 24 has a blade suction port 27,
28 are formed and communicate with a space 29 therein. In addition, the diaphragm outer ring 21 and the diaphragm outer ring 23 both have a space 30,
31 while the outer peripheral wall 2 of the diaphragm outer ring 21 is formed.
0 forms an outer peripheral wall suction port 32 that communicates with the space 30. Further, the space 30 communicates directly or indirectly with, for example, a condenser (not shown) having a low pressure and easy drainage.

On the other hand, the outer peripheral wall 20 of the diaphragm outer ring 21
As shown in FIG. 2, the outer peripheral wall suction port 32 formed at the rear surface 33 side of the one turbine nozzle 24a at the rear edge 33 side.
6 from the periphery facing the blade suction port 28 to the periphery facing the blade suction port 27 of the back surface 25 on the front edge side of the adjacent turbine nozzle 24b.

The outer peripheral wall suction port 32 forms a circular opening 35 at an intermediate portion thereof, and forms a slit-like long hole 36 extending outward from both edges of the cross section of the opening 35. . In this case, the point R at one end of the long hole 36 facing the adjacent turbine nozzle 24b is set to the reference zero, and from this point to the point S at the other end of the long hole 36 facing the one turbine nozzle 24a. When the length of the long hole 36 is L when the distance of the hole is dimensionless and is 1.0, and the diameter B of the circular hole 35 is L, the length ratio of the hole 35 (crossing of the hole 35) Direction length ratio) is set in a range of B / L = 0.1 to 0.7. When the width of the long hole 36 is W, the opening width ratio of the opening 35 is set in a range of B / W = 1.5 to 3.0.

As described above, the outer peripheral wall suction port 32 is formed by combining the slit-shaped long hole 36 and the circular opening 35, and the length ratio of the opening 35 is B / L = 0.1. ~
0.7, and the opening ratio of the opening 35 is B /
Since W is set in the range of 1.5 to 3.0, as shown in FIG. 3, the water film M is formed by the secondary flow vortex from the abdominal surface 26 of one turbine nozzle 24 a to the back surface 25 of the adjacent turbine nozzle 24 b. _{Even if 2} is drifted, the water film M ₂ can be sucked in favorably without dulling. That is, when the long hole 36 at the cross-sectional position PP shown in FIG. 3 is quantitatively observed by a model turbine, the turbine drive steam ST is deflected by the secondary flow vortex as shown in FIG. also, it was found that inhale water film M ₂ good. Further, the opening 3 at the cross-sectional position QQ shown in FIG.
5 is also quantitatively observed with a model turbine.
As shown in FIG. 5, the water film M ₂ is sucked well,
As is conventional, the overflow of the water film M ₂ is not seen.

Therefore, according to this embodiment, the outer peripheral wall suction port 3 formed on the outer peripheral wall 20 of the diaphragm outer ring 21 is formed.
2 is formed by combining a slit-like long hole 36 and a circular opening 35, and the length ratio B / L of the opening 35 is
Since it is formed appropriately with respect to the entire length L of the long hole 36, and the opening width ratio B / W of the opening 35 is made larger than the width W of the long hole 35, it flows along the outer peripheral wall 20 of the diaphragm outer ring 21. can be sucked reliably and improving the water film M _2, the erosion of the turbine blades can be kept lower than the conventional.

FIG. 6 is a schematic cross-sectional view showing a second embodiment of the moisture separation device for a steam turbine according to the present invention. The same components as those in the first embodiment or corresponding portions are denoted by the same reference numerals.

In the present embodiment, similarly to the first embodiment, the outer peripheral wall suction port 32 is moved from the periphery facing the blade suction port 28 of the abdominal surface 26 on the trailing edge 33 side of one turbine nozzle 24a to the adjacent turbine nozzle 24b. Of the rear surface 25 on the side of the front edge 34 on the side facing the blade suction port 27.

The outer peripheral wall suction port 32 has a semi-circular opening 35 facing the downstream side of the turbine drive steam ST at an intermediate portion thereof.
Is formed, and a slit-like elongated hole 36 extending outward from both edges of the cross section of the opening 35 is formed. In this case, the point R at one end of the long hole 36 facing the adjacent turbine nozzle 24b is set to the reference zero, and from this point to the point S at the other end of the long hole 36 facing the one turbine nozzle 24a. Slot 3 when the distance is dimensionless to 1.0
6 full length of is L, when the radius B ₁ aperture 35 of semicircular length ratio of the aperture 35 (the length ratio of the transverse opening 35), 2B ₁ / L = 0 .1 to 0.7. When the width of the long hole 36 is W, the opening width ratio of the opening 35 is set in the range of B ₁ /W=1.5 to 3.0. Note that many configurations are the same as in the first embodiment, and a description thereof will be omitted.

The outer peripheral wall suction port 32 is formed in the above-mentioned dimensions, it was quantitatively observed in model turbine, not overflow the water film M ₂ is observed.

Therefore, according to this embodiment, the outer peripheral wall suction port 32 is formed by combining the slit-shaped long hole 36 with the semicircular opening 35 facing the downstream side of the turbine drive steam ST, In addition, the length ratio 2B ₁ / L of the opening 35 is relatively small with respect to the total length L of the long hole 36,
Since the opening width ratio B ₁ / W of the opening 35 is larger than the width W of the elongated hole 36, the outer peripheral wall 20 of the diaphragm outer ring 21
And improving the water film M ₂ can be reliably sucked to flow along the erosion of the turbine blades can be kept lower than the conventional.

FIG. 7 is a schematic cross-sectional view showing a third embodiment of the moisture separation device for a steam turbine according to the present invention. The same components as those in the first embodiment or corresponding portions are denoted by the same reference numerals.

In the present embodiment, the outer peripheral wall suction port 32 is formed by combining a slit-shaped long hole 36 and a semicircular opening 35 facing the upstream side of the turbine drive steam ST. In this case, the total length of the long hole 36 is L, and the radius B ₁ of the semicircular opening 35 facing the upstream side of the turbine drive steam ST.
In this case, the length ratio of the opening 35 (the ratio of the length of the opening 35 in the transverse direction) is set in the range of 2B ₁ /L=0.1 to 0.7. When the width of the long hole 36 is W, the opening width ratio of the opening 35 is set in the range of B ₁ /W=1.5 to 3.0. Incidentally, the outer peripheral wall suction port 32, formed in the above-mentioned dimensions, was quantitatively observed in model turbine, the overflow of the water film M ₂ is not permitted.

[0055] Therefore, according to this embodiment, the water film M ₂ flowing along the outer peripheral wall 20 of the diaphragm outer ring 21 at the outer peripheral wall suction port 32, since thereby sucked securely with good, turbine blades Erosion can be suppressed lower than before.

FIG. 8 is a schematic cross-sectional view showing a fourth embodiment of the moisture separation device for a steam turbine according to the present invention. The same components as those in the first embodiment or corresponding portions are denoted by the same reference numerals.

In this embodiment, the outer peripheral wall suction port 32 is formed by combining a slit-shaped long hole 36 and a box-shaped opening 35 extending toward the upstream side and the downstream side of the turbine drive steam ST. is there. In this case, when the total length of the long hole 36 is L and the length L ₁ of the box-shaped opening 35 toward the upstream side and the downstream side of the turbine drive steam ST is the length ratio (opening 35 length ratio in the transverse direction)
Is set in the range of L ₁ /L=0.1 to 0.7. Also, the width of the long hole 36 is W, the when the width of the aperture 35 and B _2, the opening width ratio of the apertures 35 B ₂ /W=1.5
It is set in the range of ~ 3.0. The outer peripheral wall inlet 32
The form of the above dimensions, even try to quantitatively observe the model turbine, the overflow of the water film M ₂ is not permitted.

[0058] Therefore, according to this embodiment, the water film M ₂ flowing along the outer peripheral wall 20 of the diaphragm outer ring 21 at the outer peripheral wall suction port 32, since thereby sucked securely with good, turbine blades Erosion can be suppressed lower than before.

FIG. 9 is a schematic cross-sectional view showing a fifth embodiment of the moisture separation device for a steam turbine according to the present invention. The same components as those in the first embodiment or corresponding portions are denoted by the same reference numerals.

In this embodiment, the outer peripheral wall suction port 32 is formed by combining a slit-shaped long hole 36 and a half-cut box-shaped opening 35 extending toward the upstream side of the turbine drive steam ST. . In this case, the total length of the long hole 36 is L, when the length L ₁ of the half-split box shape opening 35 toward the upstream side of the turbine driving steam ST, the length ratio of the aperture 35 (aperture 35 the length ratio of the transverse) is, L ₁ / L =
It is set in the range of 0.1 to 0.7. Also, the width of the long hole 36 is W, when the width of the aperture 35 and B _3, the opening width ratio of the apertures 35 is set to a range of B ₃ /W=1.5~3.0 You. Incidentally, the outer peripheral wall suction port 32, formed in the above-mentioned dimensions, was quantitatively observed in model turbine, the overflow of the water film M ₂ is not permitted.

[0061] Therefore, according to this embodiment, the water film M ₂ flowing along the outer peripheral wall 20 of the diaphragm outer ring 21 at the outer peripheral wall suction port 32, since thereby sucked securely with good, turbine blades Erosion can be suppressed lower than before.

FIG. 10 is a schematic cross-sectional view showing a sixth embodiment of the moisture separation device for a steam turbine according to the present invention.
The same components as those in the first embodiment or corresponding portions are denoted by the same reference numerals.

In the present embodiment, the outer peripheral wall suction port 32 is formed by combining a slit-shaped long hole 36 and a half-cut box-shaped opening 35 extending toward the downstream side of the turbine drive steam ST. . In this case, the total length of the long hole 36 is L, when the length L ₁ of the half-split box shape opening 35 toward the downstream side of the turbine driving steam ST, the length ratio of the aperture 35 (aperture 35 the length ratio of the transverse) is, L ₁ / L =
It is set in the range of 0.1 to 0.7. Also, the width of the long hole 36 is W, when the width of the aperture 35 and B _3, the opening width ratio of the apertures 35 is set to a range of B ₃ /W=1.5~3.0 You. Incidentally, the outer peripheral wall suction port 32, formed in the above-mentioned dimensions, even try to quantitatively observe the model turbine, the overflow of the water film M ₂ is not permitted.

[0064] Therefore, according to this embodiment, the water film M ₂ flowing along the outer peripheral wall 20 of the diaphragm outer ring 21 at the outer peripheral wall suction port 32, since thereby sucked securely with good, turbine blades Erosion can be suppressed lower than before.

FIG. 11 is a schematic cross-sectional view showing a seventh embodiment of the moisture separation device for a steam turbine according to the present invention.
The same components as those in the first embodiment or corresponding portions are denoted by the same reference numerals.

In the present embodiment, the outer peripheral wall suction port 32 is formed by combining a slit-shaped long hole 36 and an elliptical opening 35 bulging toward the upstream and downstream sides of the turbine drive steam ST. Things. In this case, the total length of the long hole 36 is L, when the length L ₂ of the elliptical aperture 35 that bulges to the upstream side and the downstream side of the turbine driving steam ST, the length ratio of the aperture 35 ( The length ratio in the transverse direction of the opening 35) is
It is set in a range of L ₂ /L=0.1~0.7. Also,
The width of the long hole 36 is W, when the width of the aperture 35 and B _4, the opening width ratio of the apertures 35 B ₄ /W=1.5~
It is set in the range of 3.0. The outer peripheral wall inlet 32
The form of the above dimensions, even try to quantitatively observe the model turbine, the overflow of the water film M ₂ is not permitted.

[0067] Therefore, according to this embodiment, the water film M ₂ flowing along the outer peripheral wall 20 of the diaphragm outer ring 21 at the outer peripheral wall suction port 32, since thereby sucked securely with good, turbine blades Erosion can be suppressed lower than before.

FIG. 12 is a schematic cross-sectional view showing an eighth embodiment of the moisture separation device for a steam turbine according to the present invention.
The same components as those in the first embodiment or corresponding portions are denoted by the same reference numerals.

In this embodiment, the outer peripheral wall suction port 32 is formed by combining a slit-shaped long hole 36 and an oval-shaped opening 35 bulging toward the upstream side and the downstream side of the turbine drive steam ST. It was done. In this case, when the total length of the long hole 36 is L and the length L ₃ of the oval opening 35 bulging toward the upstream side and the downstream side of the turbine drive steam ST, The height ratio (length ratio of the opening 35 in the transverse direction) is set in a range of L ₃ /L=0.1 to 0.7. Also, the width of the long hole 36 is W, when the width of the aperture 35 and B _5, the opening width ratio of the apertures 35 B ₅ / W =
It is set in the range of 1.5 to 3.0. Incidentally, the outer peripheral wall suction port 32, formed in the above-mentioned dimensions, was quantitatively observed in model turbine, the overflow of the water film M ₂ is not permitted.

[0070] Therefore, according to this embodiment, the water film M ₂ flowing along the outer peripheral wall 20 of the diaphragm outer ring 21 at the outer peripheral wall suction port 32, since thereby sucked securely with good, turbine blades Erosion can be suppressed lower than before.

FIG. 13 is a schematic cross-sectional view showing a ninth embodiment of the moisture separator for a steam turbine according to the present invention.
The same components as those in the first embodiment or corresponding portions are denoted by the same reference numerals.

In the present embodiment, the outer peripheral wall suction port 32 is formed by combining a slit-shaped long hole 36 and a diamond-shaped opening 35 extending toward the upstream side and the downstream side of the turbine drive steam ST. is there. In this case, the total length of the long hole 36 is L
When the length L ₄ of the diamond-shaped opening 35 facing the upstream side and the downstream side of the turbine drive steam ST is defined as the opening 3
5 (the ratio of the length of the opening 35 in the transverse direction) is L ₄ /
L is set in the range of 0.1 to 0.7. In addition, slot 3
6 is W, and the width of the opening 35 is B ₆ ,
The opening width ratio of the opening 35 is set in the range of B ₆ /W=1.5 to 3.0. Incidentally, the outer peripheral wall suction port 32, formed in the above-mentioned dimensions, even try to quantitatively observe the model turbine, the overflow of the water film M ₂ is not permitted.

[0073] Therefore, according to this embodiment, the water film M ₂ flowing along the outer peripheral wall 20 of the diaphragm outer ring 21 at the outer peripheral wall suction port 32, since thereby sucked securely with good, turbine blades Erosion can be suppressed lower than before.

FIG. 14 is a schematic cross-sectional view showing a tenth embodiment of the moisture separation device for a steam turbine according to the present invention. The same components as those in the first embodiment or corresponding portions are denoted by the same reference numerals.

In the present embodiment, the outer peripheral wall suction port 32 is formed by combining a slit-shaped long hole 36 with a mountain-shaped opening 35 extending toward the upstream side of the turbine drive steam ST. In this case, the total length of the long hole 36 is L, and the opening 3 having a mountain-shaped cross section facing the upstream side of the turbine drive steam ST.
When the length L ₅ of 5, the length ratio of the aperture 35 (the length ratio of the transverse opening 35), L ₅ /L=0.1~0.
7 is set. Further, the width of the long hole 36 is W,
When the width of the aperture 35 and L _5, the opening width ratio of the apertures 35 is set in a range of L ₅ /W=1.5~3.0. In addition, even if the outer peripheral wall suction port 32 is formed in the above-described dimensions and shape and quantitatively observed with a model turbine, the water film M
_No overflow of ₂ is allowed.

[0076] Therefore, according to this embodiment, the water film M ₂ flowing along the outer peripheral wall 20 of the diaphragm outer ring 21 at the outer peripheral wall suction port 32, since thereby sucked securely with good, turbine blades Erosion can be suppressed lower than before.

FIG. 15 is a schematic cross-sectional view showing an eleventh embodiment of the moisture separation device for a steam turbine according to the present invention. The same components as those in the first embodiment or corresponding portions are denoted by the same reference numerals.

In the present embodiment, the outer peripheral wall suction port 32 is formed by combining a slit-shaped long hole 36 with a mountain-shaped opening 35 extending toward the downstream side of the turbine drive steam ST. In this case, the total length of the long hole 36 is L, and the opening 3 having a mountain-shaped cross section facing the downstream side of the turbine drive steam ST.
When the length L ₅ of 5, the length ratio of the aperture 35 (the length ratio of the transverse opening 35), L ₅ /L=0.1~0.
7 is set. Further, the width of the long hole 36 is W,
When the width of the aperture 35 and B _7, the opening width ratio of the apertures 35 is set to a range of B ₇ /W=1.5~3.0. In addition, even if the outer peripheral wall suction port 32 is formed in the above-described dimensions and shape and quantitatively observed with a model turbine, the water film M
_No overflow of ₂ is allowed.

[0079] Therefore, according to this embodiment, the water film M ₂ flowing along the outer peripheral wall 20 of the diaphragm outer ring 21 at the outer peripheral wall suction port 32, since thereby sucked securely with good, turbine blades Erosion can be suppressed lower than before.

FIG. 16 is a schematic transverse sectional view showing a twelfth embodiment of the moisture separation device for a steam turbine according to the present invention. The same components as those in the first embodiment or corresponding portions are denoted by the same reference numerals.

In the present embodiment, the outer peripheral wall suction port 32 is formed by combining a slit-shaped long hole 36 and a semi-elliptical opening 35 bulging toward the upstream side of the turbine drive steam ST. is there. In this case, when the total length of the long hole 36 is L and the length L _{6 of} the semi-elliptical opening 35 swelling upstream of the turbine drive steam ST is the length ratio (opening 35), L ₆ /L=0.1 to
It is set in the range of 0.7. When the width of the long hole 36 is W and the width of the opening 35 is B ₈ ,
Is set in the range of B ₈ /W=1.5 to 3.0. Incidentally, the outer peripheral wall suction port 32, formed in the above-mentioned dimensions, even try to quantitatively observe the model turbine, the overflow of the water film M ₂ is not permitted.

Therefore, according to the present embodiment, the water film M ₂ flowing along the outer peripheral wall 20 of the diaphragm outer ring 21 is sucked in a good and reliable manner at the outer peripheral wall suction port 32, so that the turbine rotor blades Erosion can be suppressed lower than before.

FIG. 17 is a schematic cross-sectional view showing a thirteenth embodiment of the moisture separation device for a steam turbine according to the present invention. The same components as those in the first embodiment or corresponding portions are denoted by the same reference numerals.

In the present embodiment, the outer peripheral wall suction port 32 is formed by combining a slit-shaped long hole 36 and a semi-elliptical opening 35 bulging toward the downstream side of the turbine drive steam ST. is there. In this case, when the total length of the long hole 36 is L and the length L _{6 of} the semi-elliptical opening 35 swelling downstream of the turbine drive steam ST, the length ratio (opening 35), L ₆ /L=0.1 to
It is set in the range of 0.7. When the width of the long hole 36 is W and the width of the opening 35 is B ₈ ,
Is set in the range of B ₈ /W=1.5 to 3.0. Incidentally, the outer peripheral wall suction port 32, formed in the above-mentioned dimensions, even try to quantitatively observe the model turbine, the overflow of the water film M ₂ is not permitted.

Therefore, according to the present embodiment, the water film M ₂ flowing along the outer peripheral wall 20 of the diaphragm outer ring 21 is sucked well and surely through the outer peripheral wall suction port 32, so that the turbine rotor blades Erosion can be suppressed lower than before.

FIG. 18 is a schematic transverse sectional view showing a fourteenth embodiment of the moisture separation device for a steam turbine according to the present invention. The same components as those in the first embodiment or corresponding portions are denoted by the same reference numerals.

In this embodiment, the outer peripheral wall suction port 32 is formed by combining a slit-shaped long hole 36 and a semi-elliptical opening 35 bulging upstream of the turbine drive steam ST. . In this case, the total length of the long hole 36 is L, when the length L ₇ of the semi-oval shaped opening 35 that bulges to the upstream side of the turbine driving steam ST, the length ratio of the aperture 35 (open Hole 35
Is set in the range of L ₇ /L=0.1 to 0.7. Also, the width of the long hole 36 is W, when the width of the aperture 35 and B _9, the opening width ratio of the apertures 35 is set to a range of B ₉ /W=1.5~3.0 You. Incidentally, the outer peripheral wall suction port 32, formed in the above-mentioned dimensions, even try to quantitatively observe the model turbine, the overflow of the water film M ₂ is not permitted.

[0088] Therefore, according to this embodiment, the water film M ₂ flowing along the outer peripheral wall 20 of the diaphragm outer ring 21 at the outer peripheral wall suction port 32, since thereby sucked securely with good, turbine blades Erosion can be suppressed lower than before.

FIG. 19 is a schematic cross-sectional view showing a fifteenth embodiment of the steam turbine moisture separator according to the present invention. The same components as those in the first embodiment or corresponding portions are denoted by the same reference numerals.

In the present embodiment, the outer peripheral wall suction port 32 is formed by combining a slit-shaped long hole 36 and a semi-elliptical opening 35 bulging downstream of the turbine drive steam ST. . In this case, the total length of the long hole 36 is L, when the length L ₇ of the semi-oval shaped opening 35 that bulges to the downstream side of the turbine driving steam ST, the length ratio of the aperture 35 (open Hole 35
Is set in the range of L ₇ /L=0.1 to 0.7. Also, the width of the long hole 36 is W, when the width of the aperture 35 and B _9, the opening width ratio of the apertures 35 is set to a range of B ₉ /W=1.5~3.0 You. Incidentally, the outer peripheral wall suction port 32, formed in the above-mentioned dimensions, even try to quantitatively observe the model turbine, the overflow of the water film M ₂ is not permitted.

[0091] Therefore, according to this embodiment, the water film M ₂ flowing along the outer peripheral wall 20 of the diaphragm outer ring 21 at the outer peripheral wall suction port 32, since thereby sucked securely with good, turbine blades Erosion can be suppressed lower than before.

Next, an embodiment of a method for manufacturing a moisture separation device for a steam turbine according to the present invention will be described.

As shown in FIG. 20, the manufacturing method according to the present embodiment employs a diaphragm outer ring 21 having an outer peripheral wall suction port 32 combined with a long hole 36 and an opening 35, and a rear surface 25 and an abdominal surface 26, respectively. The turbine nozzle 24 having the blade inlets 27 and 28 and the diaphragm inner ring 23 are manufactured by a precision casting method, and then the diaphragm outer ring 21 and the diaphragm inner ring 23 are fixed to the turbine nozzle 24 by welding or the like. ing. In addition, a diaphragm outer ring 21 having an outer peripheral wall suction port 32 combined with a long hole 36 and an opening 35, a turbine nozzle 24 having blade suction ports 27 and 28 on a back surface 25 and a ventral surface 26, respectively, and a diaphragm inner ring In the case of manufacturing by the precision casting method, the diaphragm outer ring 21 and the diaphragm inner ring 23 may be fixed to the turbine nozzle 24 by welding or the like as shown in FIG. Further, as shown in FIG. 22, the diaphragm outer ring 21 having the outer peripheral wall suction port 32 combined with the long hole 36 and the opening 35 may be formed in a belt shape and manufactured by a precision casting method.

As described above, in the manufacturing method according to the present embodiment, since the diaphragm outer ring 21, the turbine nozzle 24, and the diaphragm inner ring 23 are manufactured by the precision casting method, the steam turbine having the accurate finished size and shape and excellent in quality is manufactured. And the erosion of the turbine blade can be suppressed lower than before.

[0095]

As described above, in the steam turbine moisture separator according to the present invention, the outer peripheral wall suction port formed in the outer ring of the diaphragm is formed by combining the long hole and the opening, and the opening is formed. Since the holes are formed to the appropriate size and shape, the water film flowing along the outer peripheral wall of the diaphragm outer ring can be improved and reliably sucked, and the erosion of the turbine blade can be suppressed lower than before. Can be.

In the method for manufacturing a moisture separating device for a steam turbine according to the present invention, since the diaphragm outer ring, the turbine nozzle, and the diaphragm inner ring are manufactured by the precision casting method, the finished size and shape are excellent in terms of accurate quality. A moisture separation device for a steam turbine can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing a first embodiment of a moisture separation device for a steam turbine according to the present invention.

FIG. 2 is a schematic cross-sectional view of the moisture separation device of the steam turbine cut from the direction of arrows BB in FIG.

FIG. 3 is a diagram illustrating suction of a water film at a suction port on an outer peripheral wall in the moisture separation device for a steam turbine according to the present invention.

FIG. 4 is a view for explaining suction of a water film by long holes in the moisture separation device for a steam turbine according to the present invention.

FIG. 5 is a view for explaining suction of a water film at an opening in the moisture separator for a steam turbine according to the present invention.

FIG. 6 is a schematic cross-sectional view showing a second embodiment of the moisture separation device for a steam turbine according to the present invention.

FIG. 7 is a schematic cross-sectional view showing a third embodiment of the moisture separation device for a steam turbine according to the present invention.

FIG. 8 is a schematic cross-sectional view showing a fourth embodiment of the moisture separation device for a steam turbine according to the present invention.

FIG. 9 is a schematic cross-sectional view showing a fifth embodiment of the moisture separation device for a steam turbine according to the present invention.

FIG. 10 is a schematic cross-sectional view showing a sixth embodiment of the moisture separation device for a steam turbine according to the present invention.

FIG. 11 is a schematic cross-sectional view showing a seventh embodiment of a moisture separation device for a steam turbine according to the present invention.

FIG. 12 is a schematic cross-sectional view showing an eighth embodiment of a moisture separation device for a steam turbine according to the present invention.

FIG. 13 is a schematic cross-sectional view showing a ninth embodiment of a steam turbine moisture separator according to the present invention.

FIG. 14 is a schematic cross-sectional view showing a tenth embodiment of the steam turbine moisture separation device according to the present invention.

FIG. 15 is a schematic cross-sectional view showing an eleventh embodiment of a steam turbine moisture separator according to the present invention.

FIG. 16 is a schematic cross-sectional view showing a twelfth embodiment of the moisture separation device for a steam turbine according to the present invention.

FIG. 17 is a schematic cross-sectional view showing a thirteenth embodiment of the moisture separation device for a steam turbine according to the present invention.

FIG. 18 is a schematic cross-sectional view showing a fourteenth embodiment of the moisture separation device for a steam turbine according to the present invention.

FIG. 19 is a schematic cross-sectional view showing a fifteenth embodiment of the steam turbine moisture separation device according to the present invention.

FIG. 20 is a perspective view showing an assembled state of a turbine nozzle in the method for manufacturing a moisture separation device for a steam turbine according to the present invention.

FIG. 21 is a perspective view showing an exploded state of a turbine nozzle in the method for manufacturing a moisture separation device for a steam turbine according to the present invention.

FIG. 22 is an exploded perspective view in which a belt-shaped diaphragm outer ring is applied to the turbine nozzle in the method for manufacturing a moisture separation device for a steam turbine according to the present invention.

FIG. 23 is a schematic longitudinal sectional view showing a conventional moisture separation device for a steam turbine.

24 is a schematic cross-sectional view of the moisture separation device of the steam turbine cut from the direction of arrows AA in FIG.

FIG. 25 is an IS diagram showing the above state quantities.

FIG. 26 is a view for explaining trajectories of a conventional steam turbine and a steam stream.

FIG. 27 is a graph showing the relationship between the height of a conventional turbine nozzle and the wetness of turbine driving steam.

FIG. 28 is a view for explaining the behavior of a water film in a conventional turbine drive steam.

FIG. 29 is a diagram illustrating a pressure distribution of a turbine nozzle.

FIG. 30 is a view for explaining that a secondary flow vortex is generated from an abdominal surface of one turbine nozzle to a back surface of an adjacent turbine nozzle.

FIG. 31 is a diagram illustrating that a turbine drive steam flowing through a steam passage formed by one turbine nozzle and an adjacent turbine nozzle is deviated by a secondary flow.

FIG. 32 is a diagram illustrating that a water film is sucked into an outer peripheral wall suction port in a conventional moisture separation device for a steam turbine.

FIG. 33 is a graph showing the distribution of water droplets sucked by the outer peripheral wall suction port in the conventional moisture separation device for a steam turbine.

FIG. 34 is a view for explaining that an outer peripheral wall suction port sucks a water film at a cross-sectional position PP in FIG. 32;

FIG. 35 is a view for explaining that an outer peripheral wall suction port sucks a water film at a cross-sectional position QQ in FIG. 32;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 turbine nozzle 2 back surface 3 abdominal surface 4,5 blade suction port 6 diaphragm outer ring 7 diaphragm inner ring 8,9 space 10 outer peripheral wall 11 outer wall suction inlet 12 blade space 13 leading edge 14 trailing edge 15 turbine rotor blade 16 leading edge 20 Outer peripheral wall 21 Diaphragm outer ring 22 Inner peripheral wall 23 Diaphragm inner ring 24 Turbine nozzle 25 Back surface 26 Abdominal surface 27,28 Blade suction port 29,30,31 Space 32 External wall suction port 33 Rear edge 34 Front edge 35 Opening hole 36 Long hole

Claims (18)

[Claims] 1. A moisture separation device for a steam turbine having a turbine nozzle having a blade suction port formed on a back surface and an abdominal surface between a diaphragm outer ring and a diaphragm inner ring forming an outer peripheral wall suction port. The suction port has an opening formed in an intermediate portion of a long hole extending from an abdominal surface side at a rear edge of one turbine nozzle to a rear surface at a front edge of an adjacent turbine nozzle. Separation device. 2. The moisture separation device for a steam turbine according to claim 1, wherein the long hole is formed in a slit shape. 3. The opening is formed in a circular shape,
When the total length of the long hole is L, the width of the long hole is W, and the diameter of the above hole is B, the length ratio B / L of the above hole to the total length of the long hole is as follows: /L=0.1 to 0.7, while the opening width ratio B / W of the opening to the width of the slot is as follows: B / W = 1.5 to 3.0 The moisture separation device for a steam turbine according to claim 1, wherein the moisture separation device is set in the range of: 4. The opening is formed in a semicircular shape facing the downstream side of the turbine driving steam, the total length of the long hole is L, the width of the long hole is W, and the radius of the opening is B _1. Where the length ratio of the opening to the total length of the slot is 2B ₁ /
L is set in the range of 2B ₁ /L=0.1 to 0.7, while the opening width ratio B ₁ / W of the opening to the width of the elongated hole is expressed by the following expression. 2. The moisture separation device for a steam turbine according to claim _1, wherein _{1 /} W is set in a range of 1.5 to 3.0. 3. 5. The opening is formed in a semicircular shape facing the upstream side of the turbine driving steam, the total length of the long hole is L, the width of the long hole is W, and the radius of the opening is B ₁ . The length ratio of the opening to the total length of the slot is 2B ₁ /
L is set in the range of 2B ₁ /L=0.1 to 0.7, while the opening width ratio B ₁ / W of the opening to the width of the long hole is given by: 2. The moisture separation device for a steam turbine according to claim _1, wherein _{1 /} W is set in a range of 1.5 to 3.0. 3. 6. The opening is formed in a box shape extending toward the upstream side and the downstream side of the turbine driving steam, and the total length of the long hole is L, the width of the long hole is W, and the length of the opening is long. When the length is L ₁ and the width of the opening is B ₂ ,
The length ratio L ₁ / L of the opening to the total length of the slot is set in the range of L ₁ /L=0.1 to 0.7, while the length of the slot is 0.1 to 0.7. opening width ratio B ₂ / W to the width is ## EQU7 ## moisture separator device of a steam turbine according to claim 1, wherein the set to a range of B ₂ /W=1.5~3.0. 7. The opening is formed in a half box shape extending toward the upstream side of the turbine driving steam.
The total length of the long hole is L, the width of the long hole and is W, the length of the aperture and L _1, when the width of the aperture and B _3, the length of the total length of the long hole of the opening The ratio L ₁ / L is set in the range of L ₁ /L=0.1 to 0.7, while the opening width ratio B ₃ / W of the opening to the width of the slot is 10. The steam turbine moisture separation device according to claim 1, wherein B _{3 /} W is set in a range of 1.5 to 3.0. 8. The opening is formed in a half-split box shape extending toward the downstream side of the turbine driving steam.
The total length of the long hole is L, the width of the long hole and is W, the length of the aperture and L _1, when the width of the aperture and B _3, the length of the total length of the long hole of the opening The ratio L ₁ / L is set in the range of L ₁ /L=0.1 to 0.7, while the opening width ratio B ₃ / W of the opening to the width of the slot is Equation 12] moisture separator device of a steam turbine according to claim 1, wherein the set to a range of B ₃ /W=1.5~3.0. 9. The opening is formed in an elliptical shape that bulges toward the upstream and downstream sides of the turbine driving steam, the total length of the long hole is L, the width of the long hole is W, Where L ₂ is the length of the hole and B ₄ is the width of the hole, the length ratio L ₂ / L of the hole to the total length of the slot is L ₂ / L = 0. On the other hand, the opening width ratio B ₄ / W of the opening to the width of the elongated hole is set in the range of B ₄ /W=1.5 to 3.0. The moisture separation device for a steam turbine according to claim 1, wherein the moisture separation device is set. 10. The opening is formed in an oval shape bulging toward the upstream side and the downstream side of the turbine driving steam, the total length of the long hole is set to L, the width of the long hole is set to W, and the length of the hole and L _3, when the B ₅ the width of the aperture,
The length ratio L ₃ / L of the opening to the total length of the slot is set in the range of L ₃ /L=0.1 to 0.7, while the length of the slot is 0.1 to 0.7. opening width ratio B ₅ / W to the width is [number 16] moisture separator device of a steam turbine according to claim 1, wherein the set to a range of B ₅ /W=1.5~3.0. 11. The opening is formed in a rhombus shape extending toward the upstream side and the downstream side of the turbine driving steam, the total length of the long hole is set to L, the width of the long hole is set to W, and the length of the opening is set to be long. When the length of the opening is B ₄ and the width of the opening is B ₆ , the length ratio L ₄ / L of the opening to the total length of the slot is L ₄ /L=0.1 to On the other hand, the opening width ratio B ₆ / W of the opening to the width of the elongated hole was set in the range of B ₆ /W=1.5 to 3.0. The moisture separation device for a steam turbine according to claim 1, wherein: 12. The opening is formed in a cross-sectional mountain shape extending toward the upstream side of the turbine driving steam, and the entire length of the long hole is L, the width of the long hole is W, and the length of the opening is and L _5, when the width of the aperture and B _7, the length ratio L ₅ / L of the total length of the long hole of the apertures ## number 19 L ₅ /L=0.1~0. 7, while the opening width ratio B ₇ / W of the opening to the width of the elongated hole is expressed as follows: B ₇ /W=1.5 to 3.0 The moisture separation device for a steam turbine according to claim 1, wherein: 13. The opening is formed in a cross-sectional mountain shape extending toward the downstream side of the turbine driving steam, the total length of the long hole is L, the width of the long hole is W, and the length of the opening is and L _5, when the width of the aperture and B _7, the length ratio L ₅ / L of the total length of the long hole of the apertures ## number 21 L ₅ /L=0.1~0. 7, while the opening width ratio B ₇ / W of the opening to the width of the elongated hole is expressed as follows: B ₇ /W=1.5 to 3.0 The moisture separation device for a steam turbine according to claim 1, wherein: 14. The opening is formed in a semi-elliptical shape bulging toward the upstream side of the turbine driving steam, and the total length of the long hole is L, the width of the long hole is W, and the length of the opening is long. It was the L ₆ is, when the width of the aperture and B _8, the length ratio of the total length of the long hole of the aperture L ₆ / L is [number 23] L ₆ /L=0.1～ On the other hand, the opening width ratio B ₈ / W of the opening to the width of the slot was set to the range of B ₈ /W=1.5 to 3.0. The moisture separation device for a steam turbine according to claim 1, wherein: 15. The opening is formed in a semi-elliptical shape swelling toward the downstream side of the turbine driving steam, and the total length of the long hole is L, the width of the long hole is W, and the length of the opening is long. When the length of the opening is B ₆ and the width of the opening is B ₈ , the length ratio L ₆ / L of the opening to the total length of the long hole is as follows: L ₆ /L=0.1 to On the other hand, the opening width ratio B ₈ / W of the opening to the width of the elongated hole was set in the range of B ₈ /W=1.5 to 3.0. The moisture separation device for a steam turbine according to claim 1, wherein: 16. The opening is formed in a semi-elliptical shape swelling toward the upstream side of the turbine driving steam, the entire length of the long hole is set to L, the width of the long hole is set to W, and Assuming that the length is L ₇ and the width of the opening is B ₉ , the length ratio L ₇ / L of the opening to the total length of the long hole is as follows: L ₇ /L=0.1 While the opening width ratio B ₉ / W of the opening to the width of the elongated hole is set in the range of B ₉ /W=1.5 to 3.0. The moisture separation device for a steam turbine according to claim 1, wherein: 17. The opening is formed in a semi-elliptical shape bulging toward the downstream side of the turbine drive steam, the entire length of the long hole is set to L, the width of the long hole is set to W, and When the length is L ₇ and the width of the opening is B ₉ , the length ratio L ₇ / L of the opening to the total length of the long hole is as follows: L ₇ /L=0.1 While the opening width ratio B ₉ / W of the opening to the width of the elongated hole is set in the range of B ₉ /W=1.5 to 3.0. The moisture separation device for a steam turbine according to claim 1, wherein: 18. A diaphragm outer ring having an outer peripheral wall suction port formed by combining an elongated hole and an opening, and a turbine nozzle and a diaphragm inner ring having a blade suction port on a back surface and an abdominal surface are manufactured by a precision casting method. A method for manufacturing a moisture separation device for a steam turbine, comprising: