JPH10103010A - Turbine stationary blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turbine stationary blade capable of remarkably reducing cost by connecting a stationary blade and a casing by welding, and also connecting the blade end of the stationary blade by welding in the turbine stationary blade used for a steam turbine or the like. SOLUTION: A shelf part 10 which is fixed to the peak end of a stationary blade 4, has a welding open tip for connecting and fixing the peak ends of the adjacent stationary blades forming cascade on the upper surface, and a welding part 8 which is formed in a blade root part 5 of the stationary blade and fixes the stationary blade to the upper end of a planting groove 3 of a casing 2 are arranged. Unsatisfactory of the conventional turbine stationary blade is eliminated, cost is reduced, and the turbine stationary blade having larger structural strength like the conventional stationary blade can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam turbine for rotating a rotor shaft of a steam turbine to generate power, thereby expanding a steam flow to increase velocity energy and changing a flow direction. About wings.

[0002]

2. Description of the Related Art A turbine vane used in a steam turbine has a casing formed with an annular passage through which steam for generating power passes is formed on the outer periphery of a rotor shaft for taking out power generated by the steam turbine to the outside. A configuration in which an implantation groove is provided in the circumferential direction of the interior surface of the vehicle, and a blade root portion is sequentially inserted into the implantation groove, and a stationary blade is implanted around the entire interior surface of the interior of the vehicle to form a cascade. It has become.

[0003] The steam flowing into such a cascade is
When passing through the cascade, it expands due to the pressure difference between the paragraphs,
As the velocity energy increases, the steam flow increases so as to impinge on the moving blade at a collision angle that generates a large driving force on the moving blade implanted on the outer periphery of the rotor shaft on the downstream side of the cascade. By changing the direction and discharging the steam, the stored energy of the steam is effectively converted into power.

FIG. 3 is a partial longitudinal sectional view of a steam turbine provided with such turbine vanes. As shown in the figure, a casing 02, which is divided into upper and lower parts, is fixed inside the turbine casing 01 so that horizontal overlapping surfaces, which are overlapping surfaces, match each other. On the inner peripheral surface of the vehicle interior 02 in which a cylindrical space is formed by matching the horizontal mating surfaces, an implantation groove 03 is defined over the entire circumference in the circumferential direction. The vane root portion 05 is fitted to the vane 03, and the stationary vane 04 fixed to the vehicle compartment 02 is provided to form a cascade 013.

[0005] More specifically, FIG.
As shown in (a), the stator vane 04 has a semi-annular inner surface of the casing 02 before being assembled into the casing 02 shown in FIG. The vane roots 05 of the stationary vanes 04 are inserted one by one from the open ends of the implantation grooves 03 which are defined over the half circumference and open to the horizontal mating surface, and are implanted in the circumferential direction. A cascade 013 as shown in FIG. 4B is formed on the peripheral surface.

A rotor shaft 011 having a rotor blade 012 implanted on an outer peripheral surface of a disk protruding from an outer periphery is disposed in the casing 02 on the downstream side of the cascade 013. A steam passage 014 is formed between the outer peripheral surface of the rotor shaft 011 and the inner peripheral surface of the vehicle compartment 02, and the steam flowing out of the cascade 013 flows directly into the moving blades 012.
Therefore, the cascade 012 expands and accelerates when the inflowing steam passes through the inside thereof, thereby increasing the velocity energy. At the same time, the outflowing steam collides with the moving blades 012 to give the moving blades 012 the highest efficiency. It functions to change the direction of the flow so as to collide with the rotor blade 012 at a collision angle that generates a good driving force.

Further, a stationary blade 0 for forming a cascade 013 is provided.
14 at the time of insertion into the implantation groove 03,
5, a caulking groove 08 cut out in the circumferential direction.
The caulking piece 09 shown in FIG. 5 is driven into the caulking caulking groove 010 which is similarly notched in the circumferential direction at the bottom of the implantation groove 03 to insert the blade root 05 From the implant groove 03, and the stationary blade 0
4 is securely fixed to the passenger compartment 02. Since this caulking piece 09 is made of mild steel, it is cut out in the circumferential direction and can be driven along the shapes of the caulking groove 08 and the caulking groove 010 which are formed in an arc shape. The implantation groove 03 can be fixed.

Further, a shroud 06 for interconnecting the blade tips of several adjacent stator blades 04 is provided at the blade tip of the stator blade 04 forming the blade row 013 in this way, with a Tenon 07.
The blade tips of several adjacent stationary blades 04 are fixed to each other to increase rigidity and prevent vibration that may be generated in the cascade 013. That is, Tenon 07 projecting radially from each blade tip of the stationary blade 04
Then, a hole drilled in the shroud 06 is fitted, and the tenon 3 is hit and swaged to form a cascade 013. The several adjacent stator vanes 04 are connected to each other at the blade tips. In this state, the vehicle is fixed to the passenger compartment 02, the rigidity is increased, and vibrations that may occur due to outflow, inflow steam conditions, and the like are suppressed.

As described above, in the conventional turbine vane, when manufacturing the turbine vane, (1) the stationary vane 04 is fixed to the casing 02 so that the stationary vane 04
At the bottom of the implantation groove 03 into which the blade root portion 05 is inserted, it is necessary to process the casing caulking groove 010 in the circumferential direction,
When the blade root 05 is inserted into the implantation groove 03, it is necessary to process the caulking groove 08 in the circumferential direction of the blade root 05 arranged at a position facing the blade root 05.

(2) These caulking caulking grooves 0
10 and a caulking piece 09 for driving into the caulking groove 08. That is, the material cost and processing cost of the caulking piece 09 are generated, and the
Every time the stationary blades 04 are inserted into the nozzle 3, the caulking piece 09 needs to be cut, cared, and driven.

(3) The stationary vanes 0 forming the cascade 013
4, it is necessary to install a shroud 06 for connecting the wing tips of the adjacent vanes 04 to the wing tips of the adjacent vanes 04. That is, the material cost and processing cost of the shroud 06 are generated, and the drilling, cutting,
Bending work is required.

(4) In order to attach the shroud 06, it is necessary to protrude the Tenon 07 from the blade tip of the stationary blade 04 in the outer radial direction, so that the processing of the complicated stationary blade 04 becomes more complicated. When the shroud 06 is fixed to the stationary blade 04, an operation of caulking the tenon 07 is required.

(5) Further, in order to insert the stationary blades 04 one by one into the implantation grooves 03 one by one and fix them, adjustment processing in the pitch direction is required.

For example, the number of parts required for manufacturing the turbine vane is large, the number of processing and work items is large, and the work period is prolonged.

[0015]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems of the conventional turbine vane,
The number of work items increases, and the number of parts of the turbine vane is reduced to eliminate the problems that occur during its production. The caulking piece, tenon, and shroud, which were required in the past, were abolished, and even if they were abolished, the strength was equivalent to that of the conventional turbine vane, and the sticking between the vane and the cabin was not enough. It is an object of the present invention to provide a turbine vane having a half-circle welding spelling structure of a vane which does not cause any problem, thereby shortening a working period and enabling a significant cost reduction.

[0016]

Therefore, the turbine vane of the present invention has the following means.

(1) Blade roots are sequentially inserted and implanted into the implant grooves defined in the inner circumferential direction of the vehicle cabin, and the blade tips are formed on the blade tips of the stationary vanes forming a cascade over the entire inner surface of the vehicle cabin. A shelf is provided on the top surface side of which a welding groove for securing and connecting the stationary blade and the top end of the adjacently arranged stationary blade is formed.

(2) A welded portion is provided at the root of the blade where the stationary blade is to be implanted in the implantation groove, where the stationary blade is welded to the upper end of the implantation groove to be fixed. In addition, the welded portion may be provided on all of the stationary blades forming the cascade over the entire inner surface of the casing. However, the casing in which the implantation groove into which the stationary blades are sequentially inserted and implanted is open. It is most preferable to provide only the stationary blade implanted at the closest position to the horizontal alignment surface.

As described above, the turbine vane of the present invention has the following features.
A shelf instead of the conventional shroud is provided at the tip of the vane, and the vane root of the vane is sequentially fitted into the studs of the vehicle cabin. To form a cascade, temporarily fix only the blade tips of the stationary vanes near the horizontal mating surface, and perform a full weld beveling process on the top side of the shelf. All the blade tips of the vanes forming the cascade in the chamber were welded and spelled, and then the temporary fixing parts were fully welded to form turbine cascades. The caulking grooves, caulking grooves, and caulking pieces required for the production are not required, and the shroud and tenon are not required.

Further, cutting, maintenance, driving, shroud drilling, cutting, bending, tenon caulking, pitch direction adjustment of stator vanes, and machining required for the production of turbine vanes. Becomes unnecessary.
This reduces the number of parts of the turbine vane,
Processing and work items at the time of manufacturing are reduced, so that the working period can be shortened and cost can be significantly reduced.

Further, the turbine vane of the present invention can be made equal in strength or more to the conventional turbine vane, and can be satisfactorily operated without generating vibration and the like. be able to.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a turbine vane according to the present invention will be described below with reference to the drawings. FIG. 1 is a partial end view showing a first embodiment of a turbine vane according to the present invention in a horizontal plane of a vehicle cabin.

As shown in FIG. 4, in the turbine vane for rotating the rotor shaft 011 of the steam turbine to expand the steam to give velocity energy and change the flow direction of the steam, As shown in FIG. 1, a shelf 6 is fixedly provided at the blade tip of the stationary blade 5, and a circumferential welding groove 8 is provided at the center of the top of the shelf 6. Was provided.

In this case, the blade roots 5 are sequentially inserted into the implant grooves 3 defined in the circumferential direction of the inner surface of the casing 2, and the blade roots 5 are statically placed on the inner peripheral half of the half-shaped upper casing or lower casing. After the wings 4 are fitted and the cascade 13 is formed as shown in FIG. 2, only the wing ends of the stationary blades 4 near the horizontal mating surface where the upper casing and the lower casing are overlapped are temporarily fixed. The welding groove 7 is formed so that the entire circumference can be machined, the welding 7 can be easily performed, and the adjacent stationary blades 4 forming the cascade 13 are spelled and fixed to each other.

The blade root portion 5 of the stationary blade 4 to be implanted in the implantation groove 3
In order to fix the stationary vane 4 sufficiently to the passenger compartment 2,
The cauldron caulking groove 010 is located at the back of the implant groove 3 and the blade root 5
The caulking grooves 08 are machined into
At 0, 08, drive caulking piece 09,
Instead of being fitted and fixed one by one, a welding portion 8 is provided at the blade root portion 5 of the stationary blade 4 adjacent to the horizontal mating surface, and a fillet weld 9 is formed between the blade root portion 5 and the upper surface of the implantation groove 3. I did it. The fillet weld 9 is a part in which spot welding for temporary fixing is performed at the time of forming the above-described groove 6, and the main welding is performed.

As described above, in the turbine stationary blade of the present embodiment, the shelf 10 is provided at the blade tip of the stationary blade 4 instead of the conventional shroud 06, and the blade root 5 of the stationary blade 4 is Are superimposed and fitted into the studs 3 of the respective upper and lower cabins, which are the upper and lower cabins before they are integrated into one body, and are inserted into the upper and lower cabins over the entire circumference. After the cascade 13 is formed, only the vicinity of the horizontal alignment surface is temporarily fixed, and the groove 6 (weld groove) on the top surface side of the shelf 10 is processed all around.

Thus, all of the stationary blades 4 forming the cascade 13 on the inner peripheral surface of the upper casing or the lower casing can be spelled by welding the groove 6 and can be integrated. In addition, the welded portion 8 of the temporarily fixed blade root portion 5 is completely welded, so that the integrated stationary blade 4 is securely fixed to the vehicle compartment 2.

As described above, the turbine vane of the present embodiment eliminates the need for the caulking groove 010, caulking groove 08, and caulking piece 09 required for manufacturing the conventional turbine vane, as well as the shroud 06, The tenon 07 is also unnecessary, and the processing, work, and work such as cutting, maintenance, and driving of the caulking piece 09, drilling, cutting, and bending of the shroud 06, and caulking of the tenon 07, which were required when the turbine vane was manufactured. Pitch direction adjustment of the wing 4,
Processing work is not required.

As a result, the number of parts of the turbine vane is reduced, the number of processing and work items at the time of manufacture is reduced, the work period is shortened, and the cost can be significantly reduced. Further, the turbine vane of the present embodiment can have a strength equivalent to or higher than that of the conventional turbine vane, and does not generate vibration or the like, and can perform good operation. It can be.

In the above-described embodiment, the welded portion 8 is provided at the blade root portion 5 of the stationary blade 4 adjacent to the horizontal mating surface, and this is welded to the upper surface of the implantation groove 3 by fillet welding 9. However, it is needless to say that the blade root portions 5 of all the stationary blades 4 may be formed so as to be fillet welded 9 with the upper surface of the implantation groove 3. However, according to the present embodiment, when it becomes necessary to remove the cascade 13 from the vehicle cabin 2, there is an advantage that the removal operation becomes easy.

[0031]

As described above, according to the turbine vane of the present invention, according to the constitution set forth in the claims, (1) a caulking piece conventionally required for mounting the vane in a vehicle compartment; The cabin caulking groove, caulking groove at the blade root, tenon and shroud can be abolished, the number of turbine vane parts, machining and work items at the time of manufacture can be reduced.
It can be supplied at low cost.

(2) The strength of the turbine vane can be equal to or higher than that of the conventional turbine vane.

[Brief description of the drawings]

FIG. 1 is a partial end view showing a first embodiment of a turbine vane according to the present invention in a horizontally aligned surface of a vehicle compartment;

FIG. 2 is a perspective view of a stationary blade portion of the turbine stationary blade illustrated in FIG. 1;

FIG. 3 is a partial longitudinal sectional view of a steam turbine to which the turbine vane of the present invention is applied;

4 (a) is a cross-sectional view, FIG. 4 (b) is a front view taken along the line AA shown in FIG. 4 (a), and FIG.

5 is a perspective view showing a stationary blade of the turbine stationary blade shown in FIG. 4 and a caulking piece for fixing the stationary blade to a vehicle cabin.

[Explanation of symbols]

 2,02 Cab room 3,03 Studs 4,04 Stator blades 5,05 Blade root 6 Grooves (weld groove) 7 Weld 8 Weld 9 Fillet weld 10 Shelf 13,013 Cascade 01 Turbine casing 06 Shroud 07 Tenon 08 Caulking groove 09 Caulking piece 010 Cabin caulking groove 011 Rotor shaft 012 Moving blade 014 Steam passage

Claims (1)

[Claims] 1. The method according to claim 1, wherein the leveling surfaces are superposed on each other, and
A vehicle room that is disposed below and forms an annular working fluid passage that surrounds the outer periphery of the rotor shaft therein, and a blade root portion is formed in a stud that defines an inner peripheral surface of the vehicle room in a circumferential direction. The turbine vanes are sequentially inserted and implanted, and are fixed to the top end of the turbine vanes, the turbine vanes being formed on the inner periphery of the vehicle cabin and the vanes forming a cascade having a gap between the outer periphery of the rotor shaft. A ledge formed on the upper surface with a welding groove for fixing the top ends of the adjacent stationary blades to each other; and a welded portion provided at the root of the blade for fixing the stationary blade to an upper end of the implantation groove. And a turbine vane.