U.S. patent application number 16/008301 was filed with the patent office on 2018-10-11 for reaction-type steam turbine.
This patent application is currently assigned to POSCO ENERGY CO., LTD.. The applicant listed for this patent is Jeajun Lee, Sanghoon Lee, Sangmyeong Lee, Juchang Lim, Sung Keun Oh. Invention is credited to Jeajun Lee, Sanghoon Lee, Sangmyeong Lee, Juchang Lim, Sung Keun Oh.
Application Number | 20180291741 16/008301 |
Document ID | / |
Family ID | 59056988 |
Filed Date | 2018-10-11 |
United States Patent
Application |
20180291741 |
Kind Code |
A1 |
Lee; Jeajun ; et
al. |
October 11, 2018 |
REACTION-TYPE STEAM TURBINE
Abstract
Disclosed is a reaction-type steam turbine, including: a housing
provided at a first side thereof with a steam inlet tube and at a
second side thereof with a steam outlet tube, the housing having a
space formed therein; and a turbine shaft provided to pass through
the space of the housing, with a plurality of disk blades fitted
over the turbine shaft, wherein a guide blade assembly is coupled
to the turbine shaft at a position between a duct of the steam
inlet tube and the disk blades, the guide blade assembly guiding
steam introduced through the steam inlet tube into the space of the
housing toward the disk blades.
Inventors: |
Lee; Jeajun; (Seoul, KR)
; Lee; Sanghoon; (Seoul, KR) ; Oh; Sung Keun;
(Incheon, KR) ; Lee; Sangmyeong; (Gyeonggi-do,
KR) ; Lim; Juchang; (Incheon, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Lee; Jeajun
Lee; Sanghoon
Oh; Sung Keun
Lee; Sangmyeong
Lim; Juchang |
Seoul
Seoul
Incheon
Gyeonggi-do
Incheon |
|
KR
KR
KR
KR
KR |
|
|
Assignee: |
POSCO ENERGY CO., LTD.
Seoul
KR
|
Family ID: |
59056988 |
Appl. No.: |
16/008301 |
Filed: |
June 14, 2018 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/KR2016/005228 |
May 18, 2016 |
|
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|
16008301 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F01D 1/32 20130101; F05D
2240/242 20130101; F01D 1/34 20130101; F05D 2220/31 20130101; F05D
2250/51 20130101; F05D 2210/43 20130101; F01D 5/147 20130101; F01D
1/06 20130101; F01D 1/14 20130101 |
International
Class: |
F01D 1/06 20060101
F01D001/06; F01D 1/14 20060101 F01D001/14; F01D 5/14 20060101
F01D005/14; F01D 1/32 20060101 F01D001/32 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 15, 2015 |
KR |
10-2015-0179105 |
Claims
1. A reaction-type steam turbine, comprising: a housing provided at
a first side thereof with a steam inlet tube and at a second side
thereof with a steam outlet tube, the housing having a space formed
therein; and a turbine shaft provided to pass through the space of
the housing, with a plurality of disk blades fitted over the
turbine shaft, wherein a guide blade assembly is coupled to the
turbine shaft at a position between a duct of the steam inlet tube
and the disk blades, the guide blade assembly guiding steam
introduced through the steam inlet tube into the space of the
housing toward the disk blades.
2. The reaction-type steam turbine of claim 1, wherein the guide
blade assembly is provided with a plurality of drag blades radially
arranged along a circumference of the turbine shaft, and facing the
steam introduced through the steam inlet tube.
3. The reaction-type steam turbine of claim 2, wherein each of the
drag blades of the guide blade assembly is formed such that an end
of each drag blade is bent toward the steam inlet tube in a curved
shape, such that the steam is guided to flow only toward the disk
blades.
4. The reaction-type steam turbine of claim 1, wherein the space of
the housing includes: a turbine entrance directly connected to the
duct of the steam inlet; and turbine spaces defined at a side of
the turbine entrance, with the disk blades installed in the
respective turbine spaces, the turbine spaces being arranged such
that the turbine shaft having the plurality of disk blades is
placed perpendicular to the steam inlet tube, and the guide blade
assembly is coupled to the turbine shaft at a position where the
turbine entrance is provided.
5. The reaction-type steam turbine of claim 2, wherein the space of
the housing includes: a turbine entrance directly connected to the
duct of the steam inlet; and turbine spaces defined at a side of
the turbine entrance, with the disk blades installed in the
respective turbine spaces, the turbine spaces being arranged such
that the turbine shaft having the plurality of disk blades is
placed perpendicular to the steam inlet tube, and the guide blade
assembly is coupled to the turbine shaft at a position where the
turbine entrance is provided.
6. The reaction-type steam turbine of claim 3, wherein the space of
the housing includes: a turbine entrance directly connected to the
duct of the steam inlet; and turbine spaces defined at a side of
the turbine entrance, with the disk blades installed in the
respective turbine spaces, the turbine spaces being arranged such
that the turbine shaft having the plurality of disk blades is
placed perpendicular to the steam inlet tube, and the guide blade
assembly is coupled to the turbine shaft at a position where the
turbine entrance is provided.
Description
CROSS-REFERENCE TO RELATED PATENT APPLICATIONS
[0001] This patent application is a continuation of
PCT/KR2016/005228, filed May 18, 2016, which claims priority to
Korean Application No. 10-2015-0179105, filed Dec. 15, 2015, the
entire teachings and disclosure of which are incorporated herein by
reference thereto.
TECHNICAL FIELD
[0002] The present invention relates generally to a reaction-type
steam turbine and, more particularly, to a reaction-type steam
turbine capable of removing a vortex phenomenon in a housing, and
maximizing energy output by reducing an initial load against a
rotation of a turbine shaft.
BACKGROUND ART
[0003] As well known in the art, a reaction-type steam turbine is a
machine suitable for medium and small capacity prime movers because
it obtains rotational energy from reaction of steam energy being
discharged, and has a simple structure and high thermal
efficiency.
[0004] For example, Korean Patent Application Publication No.
10-2012-0047709 (published on May 14, 2012), Korean Patent
Application Publication No. 10-2013-0042250 (published on Apr. 26,
2013), and Korean Patent No. 10-1229575 (registered on Jan. 29,
2013) all disclose examples of the reaction-type turbine.
[0005] FIG. 1 is a perspective view showing a part of a
reaction-type steam turbine according to the related art, and FIG.
2 is a front cross-sectional view showing the reaction-type steam
turbine.
[0006] As shown in FIGS. 1 and 2, the steam turbine includes a
housing 10, a turbine shaft 20 rotatably supported by the housing
10 in the housing 10, and a plurality of disk blades 30 installed
in the housing 10 and integrally rotating with the turbine shaft
20, the disk blades being arranged in parallel along the lengthwise
direction of the turbine shaft 20.
[0007] Herein, the housing 10 is provided with a steam inlet tube
11 and a steam outlet tube 12, and steam introduced through the
steam inlet tube 11 rotates the plurality of disk blades 30 while
sequentially passing through the disk blades 30 to drive the
turbine shaft 20, and then is discharged through the steam outlet
12.
[0008] Here, as shown in FIG. 2, each of the disk blades 30 is
provided with a nozzle hole 31 and an inlet hole 32, such that when
steam introduced into the inlet hole 32 is discharged to the nozzle
hole 31, the disk blade 30 is rotated by reaction of the discharged
steam.
[0009] Here, in accordance with this principle, the steam
discharged from the nozzle hole 31 of each disk blade 30 enters the
inlet hole 32 of the adjacent disk blade 30, thereby rotating the
disk blade 30. Consequentially, all the disk blades 30 are rotated
due to reaction of the steam, thereby rotating the turbine shaft 20
connected to the plurality of disk blades 30 to perform power
generation.
[0010] On the other hand, the aforementioned conventional
reaction-type steam turbine has the following problems.
[0011] The steam introduced through the steam inlet tube 11 is
introduced into a turbine entrance 13 and then must be diverted
toward the inlet hole 32 of the disk blade 30 (toward the right
side in the drawing). However, the steam introduced through the
steam inlet tube 11 may fail to be diverted to the disk blades 30
from the turbine entrance 13, and thus as shown in FIG. 3, a vortex
phenomenon occurs due to steam that swirls in the turbine entrance
13.
[0012] Thus, since steam may fail to efficiently flow into the disk
blades 30, it is difficult to maximize the rotational output of the
turbine shaft 20.
[0013] Further, due to the vortex phenomenon, there is a problem
that the friction loss is large.
BRIEF SUMMARY
[0014] Accordingly, the present invention has been made keeping in
mind the above problems occurring in the related art, and an object
of the present invention is to provide a reaction-type steam
turbine, in which a guide blade assembly is installed on a turbine
shaft at a position where a turbine entrance is provided such that
steam introduced through the turbine entrance is automatically
guided to disk blades, thereby removing a vortex phenomenon and
maximizing the output of the turbine shaft.
[0015] In order to accomplish the above object, the present
invention provides a reaction-type steam turbine, including: a
housing provided at a first side thereof with a steam inlet tube
and at a second side thereof with a steam outlet tube, the housing
having a space formed therein; and a turbine shaft provided to pass
through the space of the housing, with a plurality of disk blades
fitted over the turbine shaft, wherein a guide blade assembly is
coupled to the turbine shaft at a position between a duct of the
steam inlet tube and the disk blades, the guide blade assembly
guiding steam introduced through steam inlet tube into the space of
the housing toward the disk blades.
[0016] The guide blade assembly may be provided with a plurality of
drag blades radially arranged along a circumference of the turbine
shaft, and facing the steam introduced through the steam inlet
tube.
[0017] Each of the drag blades of the guide blade assembly may be
formed such that an end of each drag blade is bent toward the steam
inlet tube in a curved shape, such that a flow of the steam is
guided to flow only toward the disk blades.
[0018] The space of the housing may include: a turbine entrance
directly connected to the duct of the steam inlet; and turbine
spaces provided at a side of the turbine entrance, and arranged
such that the turbine shaft having the plurality of disk blades is
placed perpendicular to the steam inlet tube, and the guide blade
assembly is coupled to the turbine shaft at a position where the
turbine entrance is provided.
[0019] The reaction-type steam turbine according to the present
invention has the following effects.
[0020] First, since the guide blade assembly for guiding steam
introduced through the steam inlet tube to the disk blades is
provided at a position where the turbine entrance is provided in
the housing, a vortex phenomenon is removed.
[0021] In other words, since the flowing direction of steam
introduced into the turbine entrance from the steam inlet tube can
be directly diverted to the disk blades by the guide blade
assembly, the steam can be introduced into the disk blades without
staying in the turbine entrance. Accordingly, a vortex phenomenon
occurring due to a steam swirling can be removed.
[0022] Consequentially, it is possible to prevent friction loss
caused by the vortex phenomenon, and thereby it is possible to
realize improved energy efficiency and to maximize rotational
output of the turbine shaft.
[0023] Second, since the turbine shaft can be rotated firstly by
the rotation of the guide blade assembly prior to rotation of the
disk blades by the steam inflow, it is possible to reduce the load
required to initially start the turbine shaft.
[0024] In other words, since the turbine shaft can be rotated
firstly by pressure applied to the guide blade assembly due to the
pressure-feeding force of steam initially introduced straight from
the steam inlet tube, it is possible to reduce the load required
when the turbine shaft is secondarily and earnestly rotated by the
rotation of the disk blades.
[0025] Third, as described above, since the rotational force of the
turbine shaft is increased by using the pressure-feeding force of
the steam that rotates the guide blade assembly, the rotational
force of the turbine shaft can be doubled in comparison with the
rotational force of the turbine shaft that is rotated only by the
reaction force of the disk blades in the related art.
[0026] Consequentially, there is an effect that the output of the
turbine can be maximized.
[0027] Fourth, since the guide blade assembly is provided with the
drag blades that face the direction in which steam is introduced,
it is possible to increase the rotational output of the turbine
shaft.
[0028] In other words, since the guide blade assembly is structured
to rotate through drag of the steam, the rotational output of the
turbine shaft can be maximized.
BRIEF DESCRIPTION OF DRAWINGS
[0029] FIG. 1 is a view showing an inside of a reaction-type steam
turbine according to the related art;
[0030] FIG. 2 is a partial cross-sectional view showing steam flow
through disk blades of the reaction-type steam turbine according to
the related art;
[0031] FIG. 3 is a schematic view showing a state in which a vortex
phenomenon occurs in the reaction-type steam turbine according to
the related art;
[0032] FIG. 4 is a view showing an inside of a reaction-type steam
turbine according to a preferred embodiment of the present
invention;
[0033] FIG. 5 is an enlarged perspective view showing guide blade
assembly of the reaction-type steam turbine according to the
preferred embodiment of the present invention; and
[0034] FIG. 6 is a schematic view showing a state in which steam is
introduced into the reaction-type steam turbine according to the
preferred embodiment of the present invention.
DETAILED DESCRIPTION
[0035] All terms or words used in the specification and claims have
the same meaning as commonly understood by one of ordinary skill in
the art to which inventive concepts belong. It will be further
understood that terms, such as those defined in commonly used
dictionaries, should be interpreted as having a meaning that is
consistent with their meaning in the context of the relevant art
and will not be interpreted in an idealized or overly formal sense
unless expressly so defined herein.
[0036] Hereinafter, a reaction-type steam turbine according to a
preferred embodiment of the present invention will be described
with reference to FIGS. 4 to 6.
[0037] The reaction-type steam turbine has a technical feature
wherein a turbine shaft is provided with a guide blade assembly
whereby a direction of steam being introduced straight can be
diverted to disk blades.
[0038] As shown in FIG. 4, the reaction-type steam turbine includes
a housing 100, a turbine shaft 200, disk blades 300, and a guide
blade assembly 400.
[0039] The housing 100 provides a space in which the disk blades
300 are rotated by a reaction force of steam, and is provided at a
first side thereof with a steam inlet tube 110 and at a second side
thereof with a steam outlet tube 120.
[0040] The steam inlet tube 110 forms a duct through which steam is
introduced into the housing 100, and the steam outlet tube 120
forms a duct through which the steam introduced into the housing
100 is discharged from the disk blades 300.
[0041] The housing 100 is provided therein with a space 130 in
which the turbine shaft 200 and the disk blades 300 are
installed.
[0042] The space 130 includes a turbine entrance 131 and turbine
spaces 132.
[0043] The turbine entrance 131 defines an entrance space through
which steam introduced through the steam inlet tube 110 passes
before it is transferred to the turbine spaces 132, thereby forming
a space directly connected to the duct of the steam inlet tube 110
in a straight line.
[0044] Herein, the turbine spaces 132 provide spaces in which the
disk blades 300 are installed and the disk blades 300 are rotated,
and are provided at a side of the turbine entrance 131.
[0045] As shown in FIG. 4, the side of the turbine entrance 131
refers to a side perpendicular to the duct of the steam inlet tube
110.
[0046] In addition, the turbine spaces 132 are structured to be
connected to the duct of the steam outlet tube 120.
[0047] Next, the turbine shaft 200 is rotated by the rotational
force of both the disk blades 300 and the guide blade assembly 400
to provide a power output, and is installed inside the housing
100.
[0048] Herein, as shown in FIG. 4, the turbine shaft 200 is
installed to pass through the turbine entrance 131 and the turbine
spaces 132 of the housing 100.
[0049] Next, the disk blades 300 serve to provide power for
rotating the turbine shaft 200. The disk blades are rotated by the
reaction force generated when steam introduced through the steam
inlet tube 110 flows in and out of the disk blades 300, thereby
generating power for rotating the turbine shaft 200.
[0050] A plurality of disk blades 300 are fitted over the turbine
shaft 200 along the axis of the shaft, and the disk blades are
placed in the respective turbine spaces 132 of the housing 100.
[0051] Herein, the disk blades 300 are formed in a circular shape,
and each of the disk blades is provided with an inlet hole through
which steam is introduced and a nozzle hole through which steam is
discharged. This structure of the disk blades 300 remains the same
as that of the related art described above.
[0052] Next, the guide blade assembly 400 serve to divert a flowing
direction of steam introduced through the steam inlet tube 110 to
the turbine spaces 132, and is placed in the turbine entrance
131.
[0053] In other words, the guide blade assembly 400 serves to
interfere with steam introduced straight to the turbine entrance
131 through the steam inlet tube 110 and to transfer the steam to
the turbine spaces 132 placed at the side of the turbine entrance
131.
[0054] As shown in FIG. 4, the guide blade assembly 400 is coupled
to the turbine shaft 200 at a position where the turbine entrance
131 is provided.
[0055] The configuration of the guide blade assembly 400 will be
described in detail with reference to FIG. 5.
[0056] The guide blade assembly 400 includes a blade hub 410 that
is coupled to the turbine shaft 200 and a plurality of drag blades
420 that are radially arranged along the circumference of the blade
hub 410.
[0057] The blade hub 410 is structured to be coupled to the turbine
shaft 200, and has a cylindrical shape having an inner diameter
corresponding to a diameter of the turbine shaft 200.
[0058] Further, the drag blades 420 are configured to face steam
introduced into the turbine entrance 131 through the steam inlet
tube 110, and serve to guide the steam to the turbine spaces
132.
[0059] In other words, the guide blade assembly 400 is structured
such that the drag blades 420 face the flowing direction of steam,
thereby maximizing the effect of rotating the turbine shaft 200 due
to the pressure of steam, and also serves to divert the flowing
direction of steam to the turbine spaces 132 where the disk blades
300 are placed.
[0060] Herein, a rotation of the guide blade assembly 400 is
generated by drag of steam, so that a rotational output of the
turbine shaft 200 can be maximized.
[0061] Here, the plurality of drag blades 420 is radially arranged
along the circumference of the blade hub 410.
[0062] Here, as shown in FIG. 5, each of the drag blades 420
includes a bent portion 421 and a straight portion 422.
[0063] The bent portion 421 serves to divert steam introduced into
the turbine entrance 131 to the straight portion 422, and
constitutes a first side of the drag blades 420.
[0064] Here, the first side of the drag blades 420 refers to a side
opposite to the turbine spaces 132 where the disk blades 300 are
placed, and the bent portion 421 is bent in a direction in which
steam is introduced.
[0065] As such, since the first side of the drag blades 420 is bent
in the direction in which steam is introduced, steam introduced
into the turbine entrance 131 is guided by the bent portion 421, so
that the steam can be always directed to the turbine spaces
132.
[0066] Here, the bent portion 421 of the drag blades 420 may be
formed in a curved shape.
[0067] This is to flexibly divert the direction of steam introduced
straight into the turbine entrance 131.
[0068] The straight portion 422 serves to guide steam guided by the
bent portion 421 directly to the turbine spaces 132, and
constitutes a second side of the drag blades 420.
[0069] Hereinafter, the operation of the reaction-type steam
turbine having the above configuration will be described.
[0070] Steam is supplied through the steam inlet tube 110, and then
the steam is pressure-fed to the turbine entrance 131 through the
duct of the steam inlet tube 110.
[0071] Here, the steam hits the drag blades 420 of the guide blade
assembly 400, and is then guided along both the bent portion 421
and the straight portion 422 to the right side (turbine spaces
side) in the drawing (FIG. 4).
[0072] Here, the drag blades 420 of the guide blade assembly 400
guide the steam to the turbine spaces 132 to divert the direction
of the steam, and simultaneously rotate by receiving pressure of
the steam.
[0073] In other words, the steam introduced through the steam inlet
tube 110 also serves to firstly rotate the turbine shaft 200 by
applying pressure to the guide blade assembly 400.
[0074] As such, by firstly rotating the turbine shaft 200 by using
the steam pressure, the load required to initially rotate the
turbine shaft 200 can be reduced, thereby realizing improved energy
efficiency when rotating the turbine shaft 200.
[0075] Then, the steam introduced through the steam inlet tube 110
continuously pressurizes the drag blades 420 of the guide blade
assembly 400 to rotate the turbine shaft 200, and is simultaneously
introduced into the inlet holes of the disk blades 300 provided at
the turbine spaces 132.
[0076] Thereafter, the steam rotates the disk blades 300 while
flowing in and out of the plurality of disk blades 300, thereby
secondarily rotating the turbine shaft 200.
[0077] Through this series of processes, the output of the turbine
shaft is achieved.
[0078] As described above, the reaction-type steam turbine
according to the present invention has a technical feature wherein
the guide blade assembly 400 is coupled to the turbine shaft 200 at
a position where the turbine entrance 131 is provided.
[0079] Accordingly, the steam introduced straight into the housing
can be naturally guided toward the disk blades 300 after hitting
the guide blade assembly 400, so that it is possible to remove a
vortex phenomenon occurring due to steam that swirls in the turbine
entrance 131 and thereby reduce the energy loss.
[0080] Also, due to the pressure of steam initially introduced into
the housing, the turbine shaft can be firstly rotated by the
rotation of the guide blade assembly. Thus, it is possible to
reduce the load required when the turbine shaft is secondarily and
earnestly rotated by the rotation of the disk blades, thereby
realizing improved energy efficiency when rotating the turbine
shaft.
[0081] Although a preferred embodiment of the present invention has
been described for illustrative purposes, those skilled in the art
will appreciate that various modifications, additions and
substitutions are possible, without departing from the scope and
spirit of the invention as disclosed in the accompanying
claims.
[0082] All references, including publications, patent applications,
and patents cited herein are hereby incorporated by reference to
the same extent as if each reference were individually and
specifically indicated to be incorporated by reference and were set
forth in its entirety herein.
[0083] The use of the terms "a" and "an" and "the" and similar
referents in the context of describing the invention (especially in
the context of the following claims) is to be construed to cover
both the singular and the plural, unless otherwise indicated herein
or clearly contradicted by context. The terms "comprising,"
"having," "including," and "containing" are to be construed as
open-ended terms (i.e., meaning "including, but not limited to,")
unless otherwise noted. Recitation of ranges of values herein are
merely intended to serve as a shorthand method of referring
individually to each separate value falling within the range,
unless otherwise indicated herein, and each separate value is
incorporated into the specification as if it were individually
recited herein. All methods described herein can be performed in
any suitable order unless otherwise indicated herein or otherwise
clearly contradicted by context. The use of any and all examples,
or exemplary language (e.g., "such as") provided herein, is
intended merely to better illuminate the invention and does not
pose a limitation on the scope of the invention unless otherwise
claimed. No language in the specification should be construed as
indicating any non-claimed element as essential to the practice of
the invention.
[0084] Preferred embodiments of this invention are described
herein, including the best mode known to the inventors for carrying
out the invention. Variations of those preferred embodiments may
become apparent to those of ordinary skill in the art upon reading
the foregoing description. The inventors expect skilled artisans to
employ such variations as appropriate, and the inventors intend for
the invention to be practiced otherwise than as specifically
described herein. Accordingly, this invention includes all
modifications and equivalents of the subject matter recited in the
claims appended hereto as permitted by applicable law. Moreover,
any combination of the above-described elements in all possible
variations thereof is encompassed by the invention unless otherwise
indicated herein or otherwise clearly contradicted by context.
* * * * *