JP2000337103A - Integral shroud stationary blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate assetnbly and to provide structure having a high vibration damping effect, in the integral shroud stationary blade of an axial flow machine wherein stationary blades each having an outer wheel part, a blade part, and an inner wheel shroud are annually arranged for assembly. SOLUTION: A plurality of stationary blades 2 each consisting of a blade part 4, an outer wheel part 6, and an inner wheel shroud 8 are annually arranged by inserting the outer wheel part 6 in the groove of a blade ring 10 to constitute an integral shroud stationary blade. The inner ring shroud 8 is machined such that a shape before assembly is twisted only in a fine angular arc from a shaft after assembly, and stepped part 12 is formed. In the so formed stationary blade 2, after the outer wheel parts 6 are inserted in the respective grooves of the blade rings 10, a caulking piece 14 is driven in a gap between the outet wheel part 6 and the blade ring 10 to fix a position. The adjoining shrouds of the inner wheel shrouds 8 are fitted in the stepped part 12 and adhered to each other for integral formation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integral shroud vane for an axial flow turbine or an axial flow compressor in which stator vanes having an outer ring portion, a blade portion, and an inner ring shroud are arranged in an annular shape.

[0002]

2. Description of the Related Art FIGS. 11 and 12 show examples of a conventional integral shroud vane of an axial flow turbine or an axial flow compressor in which stator vanes having an outer ring portion, a blade portion, and an inner ring shroud are arranged in an annular shape. It is. 11 and 12, reference numeral 02 denotes a stationary blade constituting an integral shroud stationary blade. The stationary blade 02 has a wing portion 04 and an outer ring portion 06 and an inner ring shroud 08 at both ends thereof.

The stationary blades 02 are manufactured one by one by machining, and the outer ring portion 06 of each blade is inserted into the groove of the blade ring 010 and assembled in a ring shape. The outer ring portion 06 and the inner ring shroud 08 are assembled as shown in the figure. Are connected to each other by welding. As described above, in the conventional integral shroud vane, the outer ring portion 06 and the inner ring shroud 08 need to be welded, which takes a long time to manufacture and increases the cost.

[0004]

SUMMARY OF THE INVENTION In view of the fact that the conventional integral shroud of an axial flow machine of an axial flow turbine or an axial flow compressor has the above-mentioned problems, the present invention
Integral shroud vanes for axial flow machines, which are assembled by arranging stator vanes having an outer ring, a blade, and an inner ring shroud in an annular shape. The integral shroud vane has a structure that is easy to assemble and has a large vibration damping effect. The challenge is to provide

[0005]

According to the present invention, there is provided an integral shroud vane for an axial flow machine in which stator vanes having an outer ring portion, a blade portion, and an inner ring shroud are arranged in an annular shape. The outer shroud of each stationary blade is inserted into the groove of the blade ring, and a caulking piece is driven between the blade ring and the outer ring to integrate the inner ring shrouds into close contact with each other to form an integral shroud for an axial flow machine. Provide wings.

As described above, in the integral shroud vane according to the present invention, since the vane is fixed to the blade ring by the caulking piece, the assembling thereof is easily performed by a simple operation of driving the caulking piece, and Can be done quickly. Further, in the integral shroud stationary blade according to the present invention, the contact surface between the stationary blades when assembled as described above can provide a damping effect by vibrating minutely with respect to vibration.

In the integral shroud vane according to the present invention, the outer ring portion is incorporated into the blade ring as described above by forming a stepped portion in which the inner ring shroud of each vane fits next to each other. At this time, the stationary blade is preferable because the inner ring shrouds of the adjacent stationary blades are tightly integrated with each other at the stepped portion of the inner ring shroud to increase rigidity.

Further, in the integral shroud stator blade according to the present invention, the inner ring shroud is formed to have a size slightly larger than the size after assembly, so that the inner ring of the adjacent stator blade when the stator blade is assembled is formed. The shrouds are strongly adhered to each other, the rigidity when the inner ring shroud is integrated is increased, and the deformation due to the external force can be suppressed, which is more preferable.

Furthermore, in the integral shroud vane according to the present invention, a tapered surface is formed on the inner ring shroud of each vane so that the inner ring shroud of the adjacent vane maintains close contact due to bending deformation of the wing portion. When configured, when the stator blades subjected to the fluid pressure load during operation undergo bending deformation, the state in which the inner ring shrouds of adjacent stator blades are firmly integrated and the rigidity is increased is maintained. It is preferable.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an integral shroud vane of an axial flow machine according to the present invention will be specifically described based on an illustrated embodiment.

(First Embodiment) First, an integral shroud vane according to a first embodiment shown in FIGS. 1 to 4 will be described. 1 to 4, reference numeral 2 denotes a stationary blade, which has a wing portion 4, an outer ring portion 6, and an inner ring shroud 8. The shape of the inner ring shroud 8 of each stationary blade 2 before assembling is processed to a state twisted by a small angle from the shape after assembling, as shown in FIG. Further, a stepped portion 12 is formed in the inner ring shroud 8.

The plurality of stationary blades 2 having such a configuration are:
It is assembled by inserting the outer ring portions 6 into the grooves of the blade ring 10 one by one. After the outer ring portion 6 of each stator blade 2 is inserted into the groove of the blade ring 10, a caulking piece 14 is driven into the gap between the outer ring portion 6 and the groove of the blade ring 10, as shown in FIGS. Each stationary blade 2 is fixed at a predetermined position on the blade ring 10.

When the stationary blade 2 is assembled as described above, the stepped portion 12 is formed, and the inner ring shroud 8 which is processed to be twisted by a small angle from the shape after assembly, Adjacent objects are fitted together and firmly adhere to each other to be integrated.

As described above, the rigidity is increased by integrating the inner ring shroud 8 of each stationary blade 2, the effect of suppressing the deformation when an external force is applied is reduced, and the vibration is reduced due to the minute sliding on the contact surface. This has the effect of attenuating.

(Second Embodiment) Next, an integral shroud vane according to a second embodiment shown in FIGS. 5 to 8 will be described. 5 to 8, the first of FIGS.
The same parts as those in the configuration of the integral shroud vane according to the embodiment are denoted by the same reference numerals, and the description thereof is omitted because they are redundant.

In the stationary blade 20 according to the present embodiment, 18
Is an inner ring shroud. The inner ring shroud 18 is formed into a shape slightly larger than the size after assembly as shown in FIG. Except for the point that the inner ring shroud 18 is different, the other configuration is substantially the same as that of the first embodiment.

A plurality of stationary blades 20 having such a configuration
However, the outer ring portions 6 are assembled by inserting the outer ring portions 6 into the grooves of the blade ring 10 one by one. After the outer ring portion 6 of each stator blade is inserted into the groove of the blade ring 10, a caulking piece 14 is driven into a gap between the outer ring portion 6 and the blade ring 10 as shown in FIGS. The wing 2 is fixed at a predetermined position on the wing ring 10. When the stator vane 2 is assembled as described above, the inner ring shroud 18 that is processed into a shape slightly larger than the assembled size is brought into close contact with each other and integrated.

As described above, by assembling the stationary blade 20 having the inner ring shroud 18 having a size slightly larger than the size after assembly, the integral shroud stationary blade obtained has a rigidity by the inner ring shroud 18 being integrated. And the deformation when an external force is applied can be suppressed to a small value, and the vibration can attenuate the vibration by virtue of the contact surface being slightly slid against the vibration.

(Third Embodiment) Next, an integral shroud vane according to a third embodiment shown in FIGS. 9 and 10 will be described. 9 and 10, the same parts as those in the configuration of the integral shroud vane of FIGS. 1 to 4 showing the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted because they are duplicated. .

In the stationary blade 30 of the present embodiment, 2
Reference numeral 8 denotes an inner ring shroud.
The tapered surface 24 is formed as shown in FIG. 9, and the inner ring shroud 28 of the adjacent stationary blade 30 is kept in close contact by bending deformation of the blade portion 4. Thus, except that the inner ring shroud 28 is different,
Other configurations are substantially the same as those of the first embodiment.

A plurality of stationary blades 30 having such a configuration
However, it is assembled by inserting the outer ring portions 6 into the grooves of the blade ring 10 one by one. Each of the stationary blades 30 includes the outer ring 6 and the blade ring 1.
After inserting into the groove of No. 0, as shown in FIGS.
A caulking piece 14 is driven into a gap between the outer ring portion 6 and the blade ring 10, and each stationary blade 30 is fixed at a predetermined position on the blade ring 10. When the stator vane 30 is assembled as described above, adjacent inner ring shrouds 28 are brought into close contact and integrated.

In the integral shroud vane according to the present embodiment, the blade portion 4 receives the pressure load of the fluid during operation.
However, when the bending deformation occurs as shown in FIG. 10B, since the inner ring shroud 28 is formed with the tapered portion 24,
Even if the deformation of the wing portion 4 is transmitted to the inner ring shroud 28, the tapered surface 24 maintains the close contact and integration of the adjacent inner ring shrouds 28 well.

As described above, the present invention has been specifically described based on the illustrated embodiments. However, the present invention is not limited to these embodiments, and specific structures within the scope of the present invention shown in the claims are set forth. Needless to say, various changes may be made to the configuration.

For example, in the above embodiment, the stepped portion for the inner ring shroud, processing into a shape slightly larger than after assembling, formation of a tapered surface, and the like are performed separately, but these are performed in an appropriate combination. Is also good.

[0025]

As described above, the present invention relates to an integral shroud vane of an axial flow machine in which stator vanes having an outer ring portion, a blade portion, and an inner ring shroud are arranged in an annular shape. The inner ring shrouds are closely integrated with each other by inserting a caulking piece between the blade ring and the outer ring part while inserting the part into the groove of the blade ring.

Therefore, in the integral shroud stationary blade according to the present invention, since the stationary blade is fixed to the blade ring by the caulking piece, the assembling can be easily performed by a simple operation of driving the caulking piece.

Further, in the integral shroud vane according to the present invention, in the configuration in which the inner ring shroud of each vane is formed with a stepped portion that is adjacent to each other, the outer ring part of each vane is formed into a blade ring. When incorporated, the inner ring shrouds of adjacent stator vanes are tightly integrated with each other at the stepped portion of the inner ring shroud.

Further, in the integral shroud stator blade according to the present invention, when the inner ring shroud is formed to have a size slightly larger than the size after assembly, the inner ring shroud of the adjacent stator blade when assembling the stator blade is formed. The inner ring shrouds are strongly adhered to each other, and the rigidity when the inner ring shroud is integrated increases, so that deformation due to external force can be suppressed to a small level.

Further, in the integral shroud vane according to the present invention, a tapered surface is formed on the inner ring shroud of each vane, and the inner ring shroud of the adjacent vane is closely contacted by bending deformation of the wing portion. In this case, when the stator blades subjected to the pressure load of the fluid during operation undergo bending deformation, the inner ring shrouds of the adjacent stator blades are firmly integrated to maintain a state of increasing rigidity.

As described above, in the integral shroud vane according to the present invention, the outer ring portion of each vane is easily fixed to the blade ring by driving the caulking piece, and the inner ring shroud is processed as described above. , The inner ring shroud is firmly integrated, and the damping effect can be given by virtue of the fact that the contact surfaces between adjacent vanes slightly vibrate with respect to vibration.

[Brief description of the drawings]

FIGS. 1A and 1B are drawings showing a structure of an integral shroud vane according to a first embodiment of the present invention, wherein FIG. 1A is a partial plan view, and FIG.

FIG. 2 is an enlarged view of FIG.

FIG. 3 is a plan view showing a state in which a caulking piece is driven in assembling the integral shroud vane of FIG. 1 (a).

FIG. 4 is a plan view showing a state where driving of the caulking piece has been completed from the state of FIG. 3;

FIGS. 5A and 5B are views showing a structure of an integral shroud vane according to a second embodiment of the present invention, wherein FIG. 5A is a partial plan view and FIG.

FIG. 6 is an enlarged view of FIG.

FIG. 7 is a plan view showing a state in which a caulking piece is driven in assembling the integral shroud stationary blade of FIG. 5 (a).

FIG. 8 is a plan view showing a state where driving of the caulking piece has been completed from the state of FIG. 7;

9A and 9B are drawings showing a structure of an integral shroud vane according to a third embodiment of the present invention, wherein FIG. 9A is a partial plan view, FIG. 9B is a view taken along the line BB of FIG. (c) is a view on arrow CC of (a).

FIGS. 10A and 10B are diagrams showing a deformation of the integral shroud vane according to the third embodiment during operation, wherein FIG. 10A is a partial plan view, and FIG.

11A and 11B are perspective views showing an assembled state of a conventional integral shroud vane, wherein FIG. 11A shows one vane, and FIG. 11B shows a plurality of vanes being assembled.

12A and 12B show a conventional integral shroud vane after assembly, wherein FIG. 12A is a partial plan view, and FIG. 12B is a view taken along the line BB of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 Stator blade 4 Blade part 6 Outer ring part 8 Inner ring shroud 10 Blade ring 12 Stepped part 14 Caulking piece 18 Inner ring shroud 20 Stationary blade 24 Tapered surface 28 Inner ring shroud 30 Stationary blade

Claims (4)

[Claims] In an integral shroud vane of an axial flow machine in which stator vanes having an outer ring part, a blade part, and an inner ring shroud are arranged in an annular shape, an outer ring part of each vane is inserted into a groove of a blade ring. An integral shroud vane for an axial flow machine, wherein a caulking piece is driven between the blade ring and an outer ring part, and the inner ring shrouds are brought into close contact with each other and integrated. 2. An integral shroud vane for an axial flow machine according to claim 1, wherein a stepped portion is formed in the inner ring shroud so that the inner shroud is adjacently fitted. 3. The integral shroud vane for an axial flow machine according to claim 1, wherein said inner ring shroud is formed to have a size slightly larger than a size after assembly. 4. The inner ring shroud according to claim 1, wherein a tapered surface is formed on the inner ring shroud so that the inner ring shrouds of adjacent vanes maintain close contact due to bending deformation of the wing portion. Axial flow machine integral shroud vane.