Turbine nozzle
First Claim
Patent Images
1. A turbine nozzle comprising:
- an annular diaphragm inner ring disposed coaxially with a predetermined axis;
an annular diaphragm outer ring disposed coaxially with the diaphragm inner ring so as to define an annular fluid passage between the diaphragm inner ring and the diaphragm outer ring; and
a plurality of nozzle blades arranged in a circumferential arrangement in the fluid passage between the diaphragm inner ring and the diaphragm outer ring and each blade having a root and a tip located respectively at the diaphragm inner ring side and the diaphragm outer ring side;
wherein the nozzle blades are curved so that the ratio S/T, where S is the minimum distance between the trailing edge of each nozzle blade and back surface of the nozzle blade adjacent to the former nozzle blade, and T is the pitch of the nozzle blades, is a minimum at a middle portion of the nozzle blade,and wherein the middle portion of each nozzle blade has a section dislocated in a flowing direction of a fluid which flows through the fluid passage relative to the root section and the tip section of the blade with respect to an axial direction.
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Accused Products
Abstract
An optimum axial distance is secured by varying the distance between a nozzle blade and a moving blade along the length of a nozzle blade (11). The nozzle blades (11) are curved so that a middle portion of each nozzle blade has a section (b2) dislocated in the flowing direction of a fluid which flows through the fluid passage relative to the root section (b3) and the tip section (b1) of the blade with respect to a circumferential direction and an axial direction. Outlet flow angle of the nozzle is varied with distance along the blade length to vary optimum axial distance properly.
74 Citations
4 Claims
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1. A turbine nozzle comprising:
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an annular diaphragm inner ring disposed coaxially with a predetermined axis; an annular diaphragm outer ring disposed coaxially with the diaphragm inner ring so as to define an annular fluid passage between the diaphragm inner ring and the diaphragm outer ring; and a plurality of nozzle blades arranged in a circumferential arrangement in the fluid passage between the diaphragm inner ring and the diaphragm outer ring and each blade having a root and a tip located respectively at the diaphragm inner ring side and the diaphragm outer ring side; wherein the nozzle blades are curved so that the ratio S/T, where S is the minimum distance between the trailing edge of each nozzle blade and back surface of the nozzle blade adjacent to the former nozzle blade, and T is the pitch of the nozzle blades, is a minimum at a middle portion of the nozzle blade, and wherein the middle portion of each nozzle blade has a section dislocated in a flowing direction of a fluid which flows through the fluid passage relative to the root section and the tip section of the blade with respect to an axial direction. - View Dependent Claims (2)
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3. A turbine nozzle comprising:
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an annular diaphragm inner ring disposed coaxially with a predetermined axis; an annular diaphragm outer ring disposed coaxially with the diaphragm inner ring so as to define an annular fluid passage between the diaphragm inner ring and the diaphragm outer ring; and a plurality of nozzle blades arranged in a circumferential arrangement in the fluid passage between the diaphragm inner ring and the diaphragm outer ring and each blade having a root and a tip located respectively at the diaphragm inner ring side and the diaphragm outer ring side; wherein the nozzle blades are curved so that the ratio S/T, where S is the minimum distance between the trailing edge of each nozzle blade and the back surface of the nozzle blade adjacent to the former nozzle blade, and T is the pitch of the nozzle blades, is a maximum at a middle portion of the nozzle blade, and wherein the middle portion of each nozzle blade has a section dislocated in a direction opposite to a flowing direction of a fluid which flows through the fluid passage relative to the root section and the tip section of the blade with respect to an axial direction. - View Dependent Claims (4)
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Specification