Power plants – Combustion products used as motive fluid – Combustion products generator
Reexamination Certificate
2000-02-07
2001-10-23
Freay, Charles G. (Department: 3746)
Power plants
Combustion products used as motive fluid
Combustion products generator
C060S039300
Reexamination Certificate
active
06305172
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a scroll of a gas turbine, and more particularly, to a scroll of a gas turbine in which the structure of the air path for cooling the scroll is improved.
2. Description of the Related Art
As shown in
FIG. 1
, a typical gas turbine engine used as an engine for industrial use includes compressors
10
a
and
10
b
for compressing external air A multiple times, a combustor
13
inside a casing for generating gas of high temperature and high pressure in a liner
12
by injecting and igniting fuel through a nozzle
14
to compressed air supplied from an outlet
10
c
of the compressors
10
a
and
10
b,
and a turbine
16
for generating a rotation force using a high pressure gas generated from the combustor.
The gas generated from the combustor
13
is provided to rotate a wheel (not shown) of the turbine
16
having a plurality of blades. A scroll
20
is related to the design of a path which appropriately guides the flow of gas.
Referring to
FIG. 2
, the scroll
20
includes a scroll main body
21
connected to the combustor
13
via the liner
12
and forming an annular space
28
, and guiding scrolls
25
and
26
connected to an opening at one side of the scroll main body
21
and extending toward the blade of the turbine
16
, forming a nozzle
27
through which gas of high temperature and high pressure flowing in the annular space
28
is injected. As combustion gas of very high temperature flows in the scroll
20
, a cooling structure to cool the scroll is needed. For this, scroll housings
22
,
23
and
24
are installed outside the scroll main body
21
and the guiding scrolls
25
and
26
, at a predetermined gap, and cooling air flows through the gap formed between the scroll housings
22
,
23
and
24
and the scroll main body
21
and the guiding scrolls
25
and
26
. As shown in
FIG. 2
, the cooling air flowing around the scroll
20
comes into the gap through holes formed in the scroll housings
22
,
23
and
24
to cool the scroll
20
.
The air supplied from the compressors
10
a
and
10
b
is mainly used as the cooling air needed in the above cooling method. Arrows shown in
FIG. 1
indicate the flow of the air flowing to the gas turbine. When the external air A is compressed by the compressors
10
a
and
10
b
and comes out through the compressor outlet
10
c,
most of the air is supplied to the casing
11
and the combustor
13
through a path formed outside the liner
12
and burned with the fuel. The remaining portion of the air is used for cooling of the scroll
20
while flowing around the scroll
20
.
Thus, in the scroll of the conventional gas turbine having the above structure, as only an extremely small portion of the compressed air is used for cooling, the efficiency of cooling is lowered so that an increase in temperature of the scroll is not appropriately prevented and thus durability of the scroll is lowered.
SUMMARY OF THE INVENTION
To solve the above problems, it is an objective of the present invention to provide a scroll of a gas turbine having a structure in which all of the compressed air is used for cooling the scroll so that the efficiency of cooling of the scroll is improved.
Accordingly, to achieve the above objective, there is provided a scroll for a gas turbine having a compressor for generating compressed air and a combustor for receiving the compressed air and generating combustion gas of high temperature, the scroll comprising a scroll main body having a predetermined space in which the gas of high temperature supplied by the combustor can flow, and a scroll housing encompassing the scroll main body and separated a predetermined distance therefrom, wherein a path through which compressed air flows is formed between the scroll main body and the scroll housing, and the compressed air flows in the path, wherein one end of the path is connected to an outlet of the compressor and the other end thereof is open toward the combustor.
Here, it is preferable in the present invention that the scroll housing is shaped to correspond to the scroll main body such that a cross sectional area of the path can be substantially constant.
It is preferable in the present invention that one end of the path is formed by the scroll housing and a guiding member connecting the compressor and the scroll main body.
It is preferable in the present invention that the cross sectional area of the path is substantially the same as that of the outlet of the compressor.
It is preferable in the present invention that the cross sectional area of the path is substantially the same as that of the outlet of the compressor.
REFERENCES:
patent: 4002157 (1977-01-01), Toesca
patent: 4339925 (1982-07-01), Eggmann et al.
patent: 4719748 (1988-01-01), Davis, Jr. et al.
patent: 4872312 (1989-10-01), Iizuka et al.
patent: 5305608 (1994-04-01), Loving
patent: 6101806 (2000-08-01), Chen et al.
Finnegan Henderson Farabow Garrett & Dunner LLP
Freay Charles G.
Samsung Aerospace Industries Ltd.
Torrente David J.
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