Rotary kinetic fluid motors or pumps – Bearing – seal – or liner between runner portion and static part – Between blade edge and static part
Reexamination Certificate
1999-06-11
2001-03-13
Look, Edward K. (Department: 3745)
Rotary kinetic fluid motors or pumps
Bearing, seal, or liner between runner portion and static part
Between blade edge and static part
Reexamination Certificate
active
06200091
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the stator of the high-pressure turbine in a turbine engine. It particularly relates to the sections of the stator that are opposite the rotor blades on the first stage of the high-pressure turbine.
2. Description of the Related Art
Referring to
FIG. 1
, in a number of examples of turbine engines the turbine casing
1
of the stator comprises annular sections
2
that are positioned opposite blades
3
of rotor
4
at the entrance to the high-pressure turbine downstream of combustion chamber
5
. Therefore, these annular sections
2
of the turbine casing
1
create play with the top of blades
3
of stator thereby determining the efficiency of the turbine engine.
However, these annular sections
2
are supplied with gas at temperatures that enable them either to dilate or to contract in order to reduce the play that exists between these blades
3
and these annular sections
2
to an absolute minimum and thereby increase the efficiency of the turbine engine. The gas is generally drawn from another area of the turbine engine according to the temperature of the gas or the speed of the rotor.
Referring to
FIG. 2
, the annular section of the stator comprises an inner ring that can be in a single piece but that often comprises a series of ring sections
6
that face the end of blades
3
of the rotor. They are supported by a spacer section
10
that is fastened to the turbine casing
1
and in which at least one cavity
11
is provided and that is in contact with ring sections
6
in order for thermal adjustment to be made to said ring sections. These ring sections
6
are fastened to spacer sections
10
of the stator using grips
7
that are positioned on the respective downstream flanges
8
and
9
of ring sections
6
and spacer sections
10
, these two flanges
8
and
9
abutting. The upstream fastening is achieved by an upstream flange
12
of each spacer section
10
being inserted into an upstream groove
13
of each ring section
6
.
It should be noted that this type of high-pressure turbine engine can comprise several stages of this kind and several subsequent ring section and spacer section stages. The ring sections
6
are located at the entrance to the high-pressure turbine in a zone where the temperature can reach 1,500° C. Consequently, the ring sections must be cooled. Also, the leaktightness between these ring sections
6
and spacer sections
10
must be as tight as possible in order to avoid any loss of the air flow from the turbine engine. The fastening grips
7
partly enable this leaktightness to be achieved. However, given the dilation due to differences in temperatures during operation, air leaks occur and the amount of air flow required from the engine to cool ring sections
6
can be significant.
The aim of the invention is to overcome this drawback by minimizing the leaks and the air flow taken from the engine in order to maintain a high level of efficiency from the turbine engine.
SUMMARY OF THE INVENTION
In order for this to be achieved, the main object of the invention is a high-pressure turbine stator ring for a turbine engine comprising turbine casing, the ring comprising the following:
spacer sections in the arc of a circle that constitute a ring-shaped spacer closed at a 360° angle, fastened to the inner surface of the turbine casing and that include an upstream leg and a downstream leg; and
ring sections in the arc of a circle that constitute a ring-shaped spacer closed at a 360° angle to be opposite, on their inner surface, to the envelope that is constituted by the blade ends of the rotating high-pressure turbine, said ring sections are fastened to the downstream leg of the spacer sections by a downstream flange that is fastened to the downstream leg of the spacer sections by fastening grips that grip both kinds of sections against each other at their downstream leg and downstream flange.
According to the invention, the downstream leg of the spacer sections and the downstream flange of the ring sections are curved and abut at radial junction surfaces that respectively extend the outer surface of the downstream leg of the spacer sections and the inner surface of the fastening flange of the downstream leg of the ring sections. This enables a 90° radial edge to be created that constitutes an additional operational part in terms of leaktightness. Furthermore, the fastening grips are positioned around the downstream section of the assembly that is thus created by the curved downstream leg and flange of the spacer sections and the ring sections.
In the main embodiment the ring sections comprise an upstream flange that is intended to be inserted in a corresponding groove of an upstream leg of the spacer sections in order to fasten the ring sections onto the spacer sections on the upstream side.
In a first utilization of the tightening grips the tightening surfaces bear on a curved section of the outer surface of the downstream leg of the spacer sections and on the curved section of the outer surface of the downstream flanges of the ring sections.
In a second utilization of the tightening grips the tightening surfaces bear on a curved section of the outer surface of the downstream leg of the spacer sections and on the curved section and the non-curved section of the outer surface of the downstream flanges of the ring sections.
REFERENCES:
patent: 3583824 (1971-06-01), Smuland et al.
patent: 3966354 (1976-06-01), Patterson
patent: 4023731 (1977-05-01), Patterson
patent: 5197853 (1993-03-01), Creevy et al.
patent: 5205708 (1993-04-01), Plemmons et al.
patent: 5288206 (1994-02-01), Bromann et al.
patent: 5399066 (1995-03-01), Ritchie et al.
patent: 5593276 (1997-01-01), Proctor et al.
patent: 5593277 (1997-01-01), Proctor et al.
patent: 5915919 (1999-06-01), Taillant et al.
patent: 5964575 (1999-10-01), Marey
patent: 0 555 082 (1993-08-01), None
Bromann Alain Marc Lucien
de Verduzan Léopold Jean Marie
Marey Daniel Jean
Look Edward K.
McAleenan James M
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Societe Nationale d'Etude et de Construction de Moteurs d&a
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