Stationary blade ring of axial compressor

Abstract

An inner shroud portion and an outer shroud portion dividedly formed per stationary blade are formed integrally with each stationary blade. A plurality of the stationary blades adjacent to each other in a circumferential direction are coupled together by a band member at the outer shroud portions. The inner shroud portions are held between seal holders which are formed as two divided members in the flowing direction of a working fluid, which are fastened by a bolt, and which have a length corresponding to the plurality of the stationary blades. The plurality of stationary blades, the inner and outer shroud portions, the band member, and the seal holders assembled in this manner constitute a unit. A plurality of the units are connected in the circumferential direction to constitute a stationary blade ring of an axial compressor.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:

FIG. 1 is a front view of a compressor stationary blade ring of a gas turbine, showing Embodiment 1 of the present invention;

FIG. 2 is a sectional view taken on line A-A in FIG. 1;

FIG. 3 is a view taken along line B-B in FIG. 1;

FIG. 4 is an exploded perspective view of essential parts of the compressor stationary blade ring of the gas turbine, showing Embodiment 2 of the present invention;

FIG. 5 is an enlarged sectional view of the essential parts in FIG. 4;

FIG. 6 is a sectional view of the essential parts of the compressor stationary blade ring of the gas turbine, showing Embodiment 3 of the present invention; and

FIGS. 7( a) and 7(b) are explanation drawings of a compressor stationary blade ring of a conventional gas turbine, FIG. 7(a) being a sectional view, and FIG. 7(b) a view taken in the direction of an arrow C in FIG. 7(a).

Claims

1. A stationary blade ring of an axial compressor, comprising a plurality of units connected-together in a circumferential direction, each unit comprising:a plurality of stationary blades adjacent to each other in the circumferential direction;an inner shroud portion and an outer shroud portion dividedly formed per stationary blade, and formed integrally with each stationary blade; anda band member for coupling together the plurality of stationary blades at the outer shroud portions.

2. The stationary blade ring of an axial compressor according to claim 1, wherein the band member is directly slidably fitted into a guide groove portion on a side of a compressor casing.

3. The stationary blade ring of an axial compressor according to claim 2, wherein the outer shroud portions for the plurality of stationary blades are coupled together by an auxiliary band member different from the band member.

4. The stationary blade ring of an axial compressor according to claim 1, wherein the outer shroud portions coupled by the band member are directly slidably fitted into a guide groove portion on a side of a compressor casing.

5. The stationary blade ring of an axial compressor according to claim 1, wherein the inner shroud portions are held by a seal holder having a length corresponding to the plurality of stationary blades adjacent to each other in the circumferential direction.

6. The stationary blade ring of an axial compressor according to claim 5, wherein the seal holder is divided into two portions in a flowing direction of a working fluid, and the two portions are fastened together by a fastening means.

7. A stationary blade ring of an axial compressor, comprising a plurality of units connected together in a circumferential direction, each unit comprising:a plurality of stationary blades adjacent to each other in the circumferential direction;an inner shroud portion and an outer shroud portion dividedly formed per stationary blade, and formed integrally with each stationary blade;connecting means for coupling together the plurality of stationary blades at the outer shroud portions; anda seal holder for holding the inner shroud portions, the seal holder having a length corresponding to the plurality of stationary blades.

8. The stationary blade ring of an axial compressor according to claim 7, wherein the seal holder is divided into two portions in a flowing direction of a working fluid, and the two portions are fastened together by a fastening means.

9. The stationary blade ring of an axial compressor according to claim 7, wherein the inner shroud portion and the seal holder are bound together by a pin.

10. The stationary blade ring of an axial compressor according to claim 7, wherein a spacer is interposed between the inner shroud portions adjacent to each other in the circumferential direction, and a spacer is interposed between the outer shroud portions adjacent to each other in the circumferential direction.