JPS5832906A - Gas turbine - Google Patents

Abstract

PURPOSE:To improve the sealing performance of a shank section by providing a seal plate with a degree of freedom for relative movements in the peripheral and axial directions of the shank between the shank sections of a turbine moving blade. CONSTITUTION:An H-shaped seal plate 19 is inserted between shank 3 sections of turbine moving blades 2 adjoining in the peripheral direction. Since individual lugs 19a protruding in four directions of the seal plate 19 have spring forces in the directions to press the sides of a groove 10, a sufficient seal performance can be assured. Furthermore, even if both adjacent shanks 3 moves relatively in the axial direction, the seal plate 19 rotates because the outside faces of individual lugs 19a are formed in an arc, and no gap is generated between the seal plate 19 and the side faces of the groove 10, thereby a sufficient sealing property can be assured. Accordingly, the sealing property of the shank section can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas turbine suitable for improving the sealing performance of a gas turbine, particularly the shank portion of a turbine rotor blade.

It is well known that in gas turbines in general, reducing the amount of air required for cooling or sealing the turbine is important for improving performance.

And regarding the shank part of the turbine rIb*,
In order to reduce seal air, it is important to ensure a reliable seal.

Figure 81 is a book showing a conventional general gas turbine, so please refer to the figure! is the stationary blade, 2F1@1. The moving @2 is a 6t moving rod 2 implanted in the rotor 4 through the implanted part 5 pipe.
A shank 3 is formed at the base of the .

In order to keep the rotor 4 in a cold atmosphere, for example, sealing air is forced out to prevent the mainstream gas 7 from entering. However, if the leakage air 8 from the shank 3 increases, mainstream gas may be mixed in, which becomes dangerous. For this reason, it is necessary to suppress the warmth of the leaked air 8 to a minimum.

Therefore, conventionally, the second shank (as shown, the radial ffl110 is located at the opposing position of the end surfaces of the mutual shanks 3 that are in contact with each other in the circumferential direction).
A method is adopted in which a band-like seal plate 9 is inserted into the vessel 0.

However, this method requires high precision in machining, such as groove positioning, and it is difficult to ensure sufficient sealing performance when adjacent shanks move relative to each other in the axial direction of the rotor. There is a problem with the buri that becomes a fly.

The present invention has been made to solve such conventional problems, and its purpose is to ensure sufficient sealing performance even if adjacent shanks move relative to each other in the same direction. Moreover, K provides a gas turbine that is easy to process.

The present invention will be explained below based on a first embodiment shown in Fig. @3.

In the figure, numeral 3 is the shank of the turbine moving shaft which is in contact with the circumferential direction. As shown in the figure, a seal plate 19 having a substantially R-shaped cross section is inserted.

Each protrusion 19a of this seal plate 19 protrudes in four directions,
It has a spring force in the direction of pressing one surface of the @ arrangement 10, and the outer surface of each protruding piece 19a is formed into a circular @ surface containing a required curvature.

1: In the above 1, each protruding piece 19a of the seal plate 19 is
It is latently pressed against the side surface of 1110 by its own spring force to form a sealed tube, thus ensuring sufficient sealing performance.

Furthermore, even if the adjacent shanks 3 move relative to each other in the axial direction, the outer surface of each protruding piece 19a is an arcuate surface, so the seal plate 19 rotates, and the gap between the seal plate 19 and the interlocking surface is This rounding ensures sufficient sealing performance without creating any gaps.

Number 4 shows the second embodiment of the present invention, and 3 in the figure is a shank adjacent to the circumferential direction indicated by arrow A in the figure, and one shank 3 is opposite to the other in the direction of shank 3. 1910 opening to the other shank 34 is provided.
The surface is provided with an opening 11111 in the axial direction indicated by arrow B in the figure. A sealing plate 290 and two panes are inserted into each of the 1110.11.

The seal and plate 29 are 1lto as shown in i41'21
The fitting part 29a inserted into the fitting part 29a and the fitting part 29aK
The hook portions 29b and 29h are continuous in a vtJ shape, and 11112 in the axial direction is formed into which the outside portion of the hook portion 29'bK#'i and the above-mentioned *'1It11 are inserted.

In the above configuration, 1) mutual shanks 3 in contact with II
The relative movement of the shank 3 in the circumferential direction is absorbed by the groove 10 and the fitting portion 29a, and the relative movement of the shank 3 in the axial direction is absorbed by the groove 11 and the hook portion 29b.

Therefore, even if the adjacent shanks 3 are mutually symmetrical, sufficient sealing performance is ensured.

Figures 5 and 6 show a third embodiment of the present invention, and in the figures, 3 is a fil shank formed at the second root portion. A groove 110 that opens into the throat of the shank 3 in contact with one trout is provided on the circumferentially adjacent shank 3 face, and a rectangular plate-shaped seal plate that contacts the shank 3 in contact with one trout is provided in this groove 10. 9 is inserted and arranged 1. This '-double root plate 39 has an angle θ with respect to the radial line 13 passing through the rotor center as shown by the 51st φ, and therefore, during operation, the centrifugal force is It is pressed against the adjacent shank 3 by the circumferential component force.

1" When the tiItm of J and F are met, the mutual shanks 3 of □4 are moved relative to each other in the same direction (is the seal plate 3
9 moves to the shank 31Q11 in contact with 4 to ensure high sealing performance, and when the mutual shanks 3 move relative to each other in the axial direction shown by arrow B in FIG. 6, the seal plate 39
slides on the end face of the adjacent shank 3 to ensure high sealing performance.

FIG. 17 shows a modification of the third embodiment, in which a seal plate 49 is used in place of the seal plate 39 in the third embodiment, the surface of which comes into contact with the adjacent shank 3 has a sawtooth shape. be.

By configuring in this way, more sufficient sealing performance is ensured.

Figures 8 and 19 show the fourth example of this ellipse. In the figure, 3 is a reed with a shank touching in the same direction, and one shank 3'II rii K is a groove 10. A plate-shaped sealing plate 59 is inserted into this beak 10, and the sealing plate 59 is made of ffI410.
The opposing shank 31C is pressed against the bottle 15 and spring 16 disposed in the inclined hole 14 connected to the shank 31C.

In the above configuration, the seal plate 59 has a degree of freedom for relative movement of the shank 3 in one direction and in the axial direction, and sufficient sealing performance is promoted.

has described the water supply invention based on a preferred embodiment, but according to the present invention! Even if the shank of the phase in contact with Il moves one inch relative to the other, optical sealing performance can be ensured.

・A simple explanation of the 'k1 plane. Figure 1 is a schematic sectional view showing the structure of a conventional gas turbine.
Fig. 2 is a sectional view taken along the line II-II in Fig.
FIG. 5 is a sectional view of essential parts showing the third embodiment of the present invention, FIG. 6 is an enlarged sectional view taken along the line ■-V in FIG. 3'1! A cross-sectional view showing a modification of the example; FIG. 8 is a cross-sectional view of main parts showing a fourth embodiment of the present invention;
FIG. 91 is a sectional view taken along the line IX-IX in FIG. 8.

2... Motion, 3... Shank, 10.11.12.
...Groove, 14...Slanted hole, 15...Pin, 16.
・Spring, 19.29.39.49.59...
Seal temporary.

patent applicant (114) Industrial Technology Director Makoto Ishizaka - Tea 1 Figure 5 Figure 6 Stem 7 diagram $8j 3/6 E

Claims (1)

[Claims] In a winter gas turbine, a seal plate is arranged between the shanks of adjacent turbine rotor blades in the same direction, and the seal plate is
A gas turbine characterized in that a means is provided to prevent deterioration in sealing performance due to relative movement of adjacent shanks.