CA2034980A1 - Labyrinth seal for steam turbines - Google Patents
Labyrinth seal for steam turbinesInfo
- Publication number
- CA2034980A1 CA2034980A1 CA002034980A CA2034980A CA2034980A1 CA 2034980 A1 CA2034980 A1 CA 2034980A1 CA 002034980 A CA002034980 A CA 002034980A CA 2034980 A CA2034980 A CA 2034980A CA 2034980 A1 CA2034980 A1 CA 2034980A1
- Authority
- CA
- Canada
- Prior art keywords
- honeycomb
- downstream
- cells
- labyrinth seal
- base portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000011144 upstream manufacturing Methods 0.000 claims description 10
- 210000004027 cell Anatomy 0.000 description 27
- 238000000605 extraction Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000006978 adaptation Effects 0.000 description 2
- 210000002421 cell wall Anatomy 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 235000012907 honey Nutrition 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 244000166490 Tetrameles nudiflora Species 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004326 stimulated echo acquisition mode for imaging Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2250/00—Geometry
- F05B2250/20—Geometry three-dimensional
- F05B2250/28—Geometry three-dimensional patterned
- F05B2250/283—Honeycomb
Landscapes
- Turbine Rotor Nozzle Sealing (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
55, 462 ABSTRACT OF THE DISCLOSURE
A honeycomb labyrinth seal includes a downstream-most row of honeycomb cells which extends beyond the exit edge of a base portion, so that a portion of each cell of the downstream-most row of honeycomb cells overhangs the base portion by an amount approximately equal to one half the width of the drainage passages formed in the base portion.
A honeycomb labyrinth seal includes a downstream-most row of honeycomb cells which extends beyond the exit edge of a base portion, so that a portion of each cell of the downstream-most row of honeycomb cells overhangs the base portion by an amount approximately equal to one half the width of the drainage passages formed in the base portion.
Description
~3~9~
~ 55,~46~2 IMPROVED LABYRINTH SEAL FOR~STEAM~TURBINES~
~ ~ AC~GROUND OF THE INVENTION~
Fleld of~the Invention The present invention~relates genèrally~to honeycomb labyrinth seals and, more specifLcally, to an improved seal which is used~for low-pressure steam turbines.
Descriptlon of the Related Art - A grooved honeycomb labyrinth seal for steamed turbines~is described in U.S.~Patent No. ;~
4,41S`,457~(assigned to Westinghouse~Electric~
~Corporat1on). `~
;Referring to Figures~l and`2~heréin,~ the`~
honeycomb l~abyrinth;seal 3 des~ribed~in the~
15 ~ aforementioned~U.~S~.~;pa~ent;~is~fo ~ ~from~-à~
p1ura1i~y~of~arcuate~se ~ ènts~each~comp~lsing~à ase~
portion~7 and~a~plurality of rows~of;honeycomb~cells~
9~extending rad1alIy~inwardly from~;the~basè` ~ ion~
7~so that~èach cell 9 is~open~`adjacent~thè~b~lades 1.
20 ~ -~A~plurality~of~pa~ssages~or~grooves~ are~so~
di~posed t at`each~ce1~1~;9~:is connected to-at~1east~
one~;passage~,;while~the~maj`or1ty o~the cells~are connected~to;~two passages or~grooves~ The~groove~
on the 1eft side~of the~drawin~ is~open~to~the~
::: : ~: : : :
~ 55,~46~2 IMPROVED LABYRINTH SEAL FOR~STEAM~TURBINES~
~ ~ AC~GROUND OF THE INVENTION~
Fleld of~the Invention The present invention~relates genèrally~to honeycomb labyrinth seals and, more specifLcally, to an improved seal which is used~for low-pressure steam turbines.
Descriptlon of the Related Art - A grooved honeycomb labyrinth seal for steamed turbines~is described in U.S.~Patent No. ;~
4,41S`,457~(assigned to Westinghouse~Electric~
~Corporat1on). `~
;Referring to Figures~l and`2~heréin,~ the`~
honeycomb l~abyrinth;seal 3 des~ribed~in the~
15 ~ aforementioned~U.~S~.~;pa~ent;~is~fo ~ ~from~-à~
p1ura1i~y~of~arcuate~se ~ ènts~each~comp~lsing~à ase~
portion~7 and~a~plurality of rows~of;honeycomb~cells~
9~extending rad1alIy~inwardly from~;the~basè` ~ ion~
7~so that~èach cell 9 is~open~`adjacent~thè~b~lades 1.
20 ~ -~A~plurality~of~pa~ssages~or~grooves~ are~so~
di~posed t at`each~ce1~1~;9~:is connected to-at~1east~
one~;passage~,;while~the~maj`or1ty o~the cells~are connected~to;~two passages or~grooves~ The~groove~
on the 1eft side~of the~drawin~ is~open~to~the~
::: : ~: : : :
- 2 - 55,462 upstream steam while ~he groove 11 on the right side of the drawing is open to the downstream and there is an interconnection between the grooves ll and the cells 9 allowing steam and water entràined in the steam to flow across the base 7 of the seal from the upstream to the downstream side of the~seal. The cells 9~are generally hexagonal having~six~walls, a~
plurality of which are common with ad~acent cell walls. ' An axially disposed gap 13~is~di~spoeed between~the circumferentially adjacent honeycomb ;~
labyrinth seal segments which permits water collected in the grooves ll to drain therefrom. An appropriate drain, not shown, is also disposed in the blade ring 5 to drain the water ~rom the seal locating groove 4 in the blade ring 5.
Figure 3A;shows a typica 1 arrangement or existing honeycomb seal designs in a steam turbine;~
blade path. A radla} step is~formed between~the~
seal inside diamèter and the outer~diameter;of the downstream blade 16. ;~;A radi~al~ohannel~is~formed~
between surface 12 and sur~ac~e~l2A~for~`the~purpase~
of removing~steam~and moisture~rom~thé~blade'~path;~
flow. ~ It'~is~difficul~;to~achleve~;~e~icient~turning~
~ of the~flow~leaving the~rotating blade~ip~region~
under the'~sea~ ;and~thus~it~is~difficu1t'for~ the;~
moisture t'o~enter~;the~extraction~slot.~ This~ ,an~
lead~to disturbed~fIow conditions~Ln this~regL
It~is~postulated that moisture~drai~age'~
~ ~from~the~sea~ may follow~a;generally axial~path~and~
become entrained~into the~main do ~ stream~flow ' through stationary~blade 16, leadlng to lnoreased .
2~3~9~
_ 3 _ 55,462 moisture erosion damage to the downstream rotating blades.
By observing flow field behavior~and moisture erosion characteristics downstream~of a typical hon ycomb seal installation, it~has been determined ~hat a disturbed flow pattern (standing vortex) can exist in associatlon wltù the~radial s~ep between the inne~ diameter of the seal~and the outer diameter surface at the inlet to the~
downstream stationary blade row. Also, moisture collected by ~the seal may not be flowing into the downstream;moisture~removal or extraction~slot as intended~. Both~of these phenomena~may be attributed to a limited a~ility of the extra`ction steam and water flow to negotiate the sharp 90~corner at the seal exit edge. ~ ~ :
SUMMARY OF THE INVENTION
~ An object o~ the present invention is to ~;~
provide an improved honeyc~omb Iabyrinth~seal in which the drainage path~for the moisture collected ~by the seal~direc;ts the~exit~water~f~low ~in~an~
outward radial dirèction~instead of~axial.
Another~ob~ect~of the~presént inYention ~is to provide~an improved~honeyaomb~labyrinth~seal~in~
~ which the~centrifugal;a~fects~of the~rotating;~blade~
are utilized~to promote~an~outward~radial fIow~o~
both s~eam~and condensed~;watèr~from`the~ blade`~t1p region near the~éX~t~edge.
Thes~e~and other objeats~of the~pr~sènt~
30~ ~ 1nvention~are~met by~provldin~ a~honeycom~ labyrlnth~
sea} cooperat1vely associated with rotatable~steam turb1ne~blades~ànd 1nc1ud1ng ~;ba~e~gor~10n hav1ng 2 ~
4 ~ 55,462 an inlet edge and an outlet edge, ~ plurality of rows of honeycomb cells extending radially inwardly from the~base portion so that each cell is open adjacent the blade, a plurality of~passages so disposed that each cell is connected to`at:least one passage:and at least one passa~e is open~upstream of the rows of honeycomb cells and at least one passage:
is opened downstream of the rows of honeycomb cells, thereby permitting steam to 10w through the ~
passages and cells from the upstream side~:to the downstream side of the honeycomb labyrinth seal, wherein a downstream most row of honeycomb~cells ;~
: extends beyond the exit edge of the backing plate, and wherein an exit edge of the rotati~g blades ~ ~;
extends beyond the honeycomb labyrinth seal~
: These and other objects and àdvantages of the honeycomb labyrinth seal of the present invention will become more apparent with reference to the following de~ailed descriptlon and;drawings. :~
20 ~ :BRIEF DESCR~PTION OF THE~DRAWINGS
Fig.~ l :is a:partial sectlonal view of a known honeycomb labyrinth seal disposed in a~portion~
of a steàmed tùxbine ~takèn~along line~ I o~FLg.:2;~
Fig.: 2 1s a plan view taken from~the~
25; ~: dire~tion;~of~:line:II -~II
Fig. 3(a): is a~:partial cut away view~
showing the~honeycomb labyrinth::seal used~prior to ;;~
the~.present~ nv~ntion;~
Fig.~ 3(b:)~is~:a partial cut-away vièw~
~30 ~ ~showing the~honey~mb~labyrlnth~eeal~according~to a;~
preferred embodl~ent~o~:~the present~Lnvenelon;~
::
~:
t~
_ 5 _ 55,462 Fig. 4 is an enlarged top view o~ a portion of the labyrinth seal of Fig. 3;
Fig. 5 is a cross-sectional view taken along line IV of Fig. 4; and Fig. 6 is a cross-sectional view taken along line VI of Fig. 4.
.
DETAILED DESCRIPTION OF THE PREFERRED E~ODIMENTS
Referring to Figs. 3-6, the honey~omb labyrinth seal 3 is connected ~o a seal support ring 12 by any conventional means through a ~ase portion 7. A moisture removal/extraction slo~ opening 14 is formed between downstream stationary blade 16 and the seal support ring 12 ad;acent the upstream stationary blade 18. The rotating blade 1 ro~ates lS in a direction perpendicular to the ~low direction~
The base portion 7 is provided with a plurality of passages by grooves 11. The labyrinth seal 3 is formed from a plurality of arcuate segments each comprising a base portion 7 and a plurality of rows of honeycomb cell~ 9 extending radially inwardly from the base portion 7 so that each cell 9 is open adjacent the blade 1. ~ach cell 9 is connected to at least one passage 11.
The base portion 7 has an exi~ side edge 20 which in the known seal described in Figs. 1 and 2 would have extended fur~her than the honeycomb cells, so that the downstream-most row o~ honeycomb cells would be centered over the downstream-most groove 11, with the downstream-most side of those 3Q cells suppor~ed on the base portion 7.
:: ~
- 6 - 55,462 According to the present invention, the downstream-most row 9A of honeycomb cells S is centered over a strip 7A of the base portion at the exit side ~the strip 7A having a width substantially the same as the width of the grooves 11) so that a portion of the cells in row ~A overhang the base portion 7. The arrangement promotes an internal moisture drainage path for those alternating groups of cells having circum~erentially oriented cell wall elements centered over the drainage grooves 11. The exit drainage flow is thus directed in a radial direction as it leaves the honeycomb cells at the exit side. The radial drainage path is between the exit edge 20 of the base portion 7 and the outermost lS wall 22 of the cells 9 in row 9A. Moisture droplet flow centrifuged outwardly from the rotating blade tip and impinging on the open face of the honeycomb cells 9 will promote a radially outward path for the seal exit drain flow.
Fig. 6 illustrates the circumferential-axial drainage path communication for all groups of cells adjacent to those shown in Fig. 5.
Generally, the desired internal water dxainage characteristics for the seal 3 are determined by the inlet ~o exi~ pressure drop acxoss the rotating blade row and the outward pressure generated by moisture droplets leaving the blade tip and entering the open face of the honeycomb cell structure.
Preferably, the downstream-most or exi~
side row of honeycomb cells extends b~yond the exit :
plurality of which are common with ad~acent cell walls. ' An axially disposed gap 13~is~di~spoeed between~the circumferentially adjacent honeycomb ;~
labyrinth seal segments which permits water collected in the grooves ll to drain therefrom. An appropriate drain, not shown, is also disposed in the blade ring 5 to drain the water ~rom the seal locating groove 4 in the blade ring 5.
Figure 3A;shows a typica 1 arrangement or existing honeycomb seal designs in a steam turbine;~
blade path. A radla} step is~formed between~the~
seal inside diamèter and the outer~diameter;of the downstream blade 16. ;~;A radi~al~ohannel~is~formed~
between surface 12 and sur~ac~e~l2A~for~`the~purpase~
of removing~steam~and moisture~rom~thé~blade'~path;~
flow. ~ It'~is~difficul~;to~achleve~;~e~icient~turning~
~ of the~flow~leaving the~rotating blade~ip~region~
under the'~sea~ ;and~thus~it~is~difficu1t'for~ the;~
moisture t'o~enter~;the~extraction~slot.~ This~ ,an~
lead~to disturbed~fIow conditions~Ln this~regL
It~is~postulated that moisture~drai~age'~
~ ~from~the~sea~ may follow~a;generally axial~path~and~
become entrained~into the~main do ~ stream~flow ' through stationary~blade 16, leadlng to lnoreased .
2~3~9~
_ 3 _ 55,462 moisture erosion damage to the downstream rotating blades.
By observing flow field behavior~and moisture erosion characteristics downstream~of a typical hon ycomb seal installation, it~has been determined ~hat a disturbed flow pattern (standing vortex) can exist in associatlon wltù the~radial s~ep between the inne~ diameter of the seal~and the outer diameter surface at the inlet to the~
downstream stationary blade row. Also, moisture collected by ~the seal may not be flowing into the downstream;moisture~removal or extraction~slot as intended~. Both~of these phenomena~may be attributed to a limited a~ility of the extra`ction steam and water flow to negotiate the sharp 90~corner at the seal exit edge. ~ ~ :
SUMMARY OF THE INVENTION
~ An object o~ the present invention is to ~;~
provide an improved honeyc~omb Iabyrinth~seal in which the drainage path~for the moisture collected ~by the seal~direc;ts the~exit~water~f~low ~in~an~
outward radial dirèction~instead of~axial.
Another~ob~ect~of the~presént inYention ~is to provide~an improved~honeyaomb~labyrinth~seal~in~
~ which the~centrifugal;a~fects~of the~rotating;~blade~
are utilized~to promote~an~outward~radial fIow~o~
both s~eam~and condensed~;watèr~from`the~ blade`~t1p region near the~éX~t~edge.
Thes~e~and other objeats~of the~pr~sènt~
30~ ~ 1nvention~are~met by~provldin~ a~honeycom~ labyrlnth~
sea} cooperat1vely associated with rotatable~steam turb1ne~blades~ànd 1nc1ud1ng ~;ba~e~gor~10n hav1ng 2 ~
4 ~ 55,462 an inlet edge and an outlet edge, ~ plurality of rows of honeycomb cells extending radially inwardly from the~base portion so that each cell is open adjacent the blade, a plurality of~passages so disposed that each cell is connected to`at:least one passage:and at least one passa~e is open~upstream of the rows of honeycomb cells and at least one passage:
is opened downstream of the rows of honeycomb cells, thereby permitting steam to 10w through the ~
passages and cells from the upstream side~:to the downstream side of the honeycomb labyrinth seal, wherein a downstream most row of honeycomb~cells ;~
: extends beyond the exit edge of the backing plate, and wherein an exit edge of the rotati~g blades ~ ~;
extends beyond the honeycomb labyrinth seal~
: These and other objects and àdvantages of the honeycomb labyrinth seal of the present invention will become more apparent with reference to the following de~ailed descriptlon and;drawings. :~
20 ~ :BRIEF DESCR~PTION OF THE~DRAWINGS
Fig.~ l :is a:partial sectlonal view of a known honeycomb labyrinth seal disposed in a~portion~
of a steàmed tùxbine ~takèn~along line~ I o~FLg.:2;~
Fig.: 2 1s a plan view taken from~the~
25; ~: dire~tion;~of~:line:II -~II
Fig. 3(a): is a~:partial cut away view~
showing the~honeycomb labyrinth::seal used~prior to ;;~
the~.present~ nv~ntion;~
Fig.~ 3(b:)~is~:a partial cut-away vièw~
~30 ~ ~showing the~honey~mb~labyrlnth~eeal~according~to a;~
preferred embodl~ent~o~:~the present~Lnvenelon;~
::
~:
t~
_ 5 _ 55,462 Fig. 4 is an enlarged top view o~ a portion of the labyrinth seal of Fig. 3;
Fig. 5 is a cross-sectional view taken along line IV of Fig. 4; and Fig. 6 is a cross-sectional view taken along line VI of Fig. 4.
.
DETAILED DESCRIPTION OF THE PREFERRED E~ODIMENTS
Referring to Figs. 3-6, the honey~omb labyrinth seal 3 is connected ~o a seal support ring 12 by any conventional means through a ~ase portion 7. A moisture removal/extraction slo~ opening 14 is formed between downstream stationary blade 16 and the seal support ring 12 ad;acent the upstream stationary blade 18. The rotating blade 1 ro~ates lS in a direction perpendicular to the ~low direction~
The base portion 7 is provided with a plurality of passages by grooves 11. The labyrinth seal 3 is formed from a plurality of arcuate segments each comprising a base portion 7 and a plurality of rows of honeycomb cell~ 9 extending radially inwardly from the base portion 7 so that each cell 9 is open adjacent the blade 1. ~ach cell 9 is connected to at least one passage 11.
The base portion 7 has an exi~ side edge 20 which in the known seal described in Figs. 1 and 2 would have extended fur~her than the honeycomb cells, so that the downstream-most row o~ honeycomb cells would be centered over the downstream-most groove 11, with the downstream-most side of those 3Q cells suppor~ed on the base portion 7.
:: ~
- 6 - 55,462 According to the present invention, the downstream-most row 9A of honeycomb cells S is centered over a strip 7A of the base portion at the exit side ~the strip 7A having a width substantially the same as the width of the grooves 11) so that a portion of the cells in row ~A overhang the base portion 7. The arrangement promotes an internal moisture drainage path for those alternating groups of cells having circum~erentially oriented cell wall elements centered over the drainage grooves 11. The exit drainage flow is thus directed in a radial direction as it leaves the honeycomb cells at the exit side. The radial drainage path is between the exit edge 20 of the base portion 7 and the outermost lS wall 22 of the cells 9 in row 9A. Moisture droplet flow centrifuged outwardly from the rotating blade tip and impinging on the open face of the honeycomb cells 9 will promote a radially outward path for the seal exit drain flow.
Fig. 6 illustrates the circumferential-axial drainage path communication for all groups of cells adjacent to those shown in Fig. 5.
Generally, the desired internal water dxainage characteristics for the seal 3 are determined by the inlet ~o exi~ pressure drop acxoss the rotating blade row and the outward pressure generated by moisture droplets leaving the blade tip and entering the open face of the honeycomb cell structure.
Preferably, the downstream-most or exi~
side row of honeycomb cells extends b~yond the exit :
3 ~
~ 7 ~ 55,462 edge 20 of the base portion 7 by about one half of a groove width.
Referring to Fig. 3, it is noted that the blade 1 preferably extends beyond the seal 3, rather than being centered under the seal as in the known seal of Figs. 1 and 2. Preferabl~, the amount of extension is determined by-the tip section width, with optimum overhang of the blade 1 baing determined in relation to the width of throat opening. The overhang of the rotating blade exit edge promotes a seal exit drainage flow path in an outward radial direction due to pressure from centrifuged moisture droplet flow leaving the blade tip. Also, the rotating blade exit edge overhang also promotes radial expansion of steam flow immediately downstream of the seal 3. This tends to direct flow towards the moisture removal or extraction slot 14 and provide well behaved (low loss) flow conditions near the outer diameter surface at the inlet to the downstream stationary blade row.
The present invention allows for increased width of downstream extraction or moisture removal slots, or alternatively, allows reduced blade path axial spacing if the extraction slot is a critical restraint, due to upstream movement of the seal and blade ring exit faces 20 and 12 ~Fig. 3) xelative to the rotating blade.
Numerous modifications and adaptations of the present invention will be apparent to those so skilled in the art and thus, it is intended by the following claims to covex all such modifications and :
2~3~
- 8 - 55,462 adaptations which fall within the true spirit and scope of the invention.
~ 7 ~ 55,462 edge 20 of the base portion 7 by about one half of a groove width.
Referring to Fig. 3, it is noted that the blade 1 preferably extends beyond the seal 3, rather than being centered under the seal as in the known seal of Figs. 1 and 2. Preferabl~, the amount of extension is determined by-the tip section width, with optimum overhang of the blade 1 baing determined in relation to the width of throat opening. The overhang of the rotating blade exit edge promotes a seal exit drainage flow path in an outward radial direction due to pressure from centrifuged moisture droplet flow leaving the blade tip. Also, the rotating blade exit edge overhang also promotes radial expansion of steam flow immediately downstream of the seal 3. This tends to direct flow towards the moisture removal or extraction slot 14 and provide well behaved (low loss) flow conditions near the outer diameter surface at the inlet to the downstream stationary blade row.
The present invention allows for increased width of downstream extraction or moisture removal slots, or alternatively, allows reduced blade path axial spacing if the extraction slot is a critical restraint, due to upstream movement of the seal and blade ring exit faces 20 and 12 ~Fig. 3) xelative to the rotating blade.
Numerous modifications and adaptations of the present invention will be apparent to those so skilled in the art and thus, it is intended by the following claims to covex all such modifications and :
2~3~
- 8 - 55,462 adaptations which fall within the true spirit and scope of the invention.
Claims (14)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A honeycomb labyrinth seal cooperatively associated with rotatable steam turbine blades, the honeycomb seal comprising:
a base portion having an inlet edge and an outlet edge;
a plurality of rows of honeycomb cells extending radially inwardly from the base portion so that each cell is open adjacent the blade;
a plurality of passages so disposed that each cell is connected to at least one passage and at least one passage is open upstream of the rows of honeycomb cells and at least one passage is open downstream of the rows of honeycomb cells, thereby permitting steam to flow through the passages and cells from the upstream side to the downstream side of the honeycomb labyrinth seal, wherein a downstream-most row of honeycomb cells extends beyond the exit edge of the base portion.
a base portion having an inlet edge and an outlet edge;
a plurality of rows of honeycomb cells extending radially inwardly from the base portion so that each cell is open adjacent the blade;
a plurality of passages so disposed that each cell is connected to at least one passage and at least one passage is open upstream of the rows of honeycomb cells and at least one passage is open downstream of the rows of honeycomb cells, thereby permitting steam to flow through the passages and cells from the upstream side to the downstream side of the honeycomb labyrinth seal, wherein a downstream-most row of honeycomb cells extends beyond the exit edge of the base portion.
2. A honeycomb labyrinth seal as recited in claim 1, wherein each rotating blade has an exit edge which extends beyond the downstream-most row of honeycomb cells.
- 10 - 55,462
- 10 - 55,462
3. A honeycomb labyrinth seal as recited in claim 1 wherein the passages extend circumferentially adjacent the base portion.
4. A honeycomb labyrinth seal as recited in claim 1, wherein the passages are grooves disposed in the base portion.
5. A honeycomb labyrinth seal as recited in claim 1, wherein the cells are hexagonally shaped.
6. A honeycomb labyrinth seal as recited in claim 1, wherein the downstream-most row of honeycomb cells is centered over a strip of the base portion formed between the exit edge and the downstream-most passage, so that a portion of each cell in the downstream-most row of honeycomb cells overhangs the base portion.
7. A honeycomb labyrinth seal as claimed in claim 6, wherein the overhanging portion of each cell of the downstream-most row of honeycomb cells is substantially equal to one half the width of the passages.
8. A honeycomb labyrinth seal cooperatively associated with rotatable steam turbine blades, the honeycomb seal comprising:
a base portion having an inlet edge and an outlet edge;
a plurality of rows of honeycomb cells extending radially inwardly from the base portion so that each cell is open adjacent the blade;
a plurality of passages so disposed that each cell is connected to at least one passage and at least one passage is open upstream of the rows of - 11 - 55,462 honeycomb cells and at least one passage is open downstream of the rows of honeycomb cells, thereby permitting steam to flow through the passages and cells from the upstream side to the downstream side of the honeycomb labyrinth seal, wherein each rotating blade has an exit edge which extends beyond the downstream-most row of honeycomb cells.
a base portion having an inlet edge and an outlet edge;
a plurality of rows of honeycomb cells extending radially inwardly from the base portion so that each cell is open adjacent the blade;
a plurality of passages so disposed that each cell is connected to at least one passage and at least one passage is open upstream of the rows of - 11 - 55,462 honeycomb cells and at least one passage is open downstream of the rows of honeycomb cells, thereby permitting steam to flow through the passages and cells from the upstream side to the downstream side of the honeycomb labyrinth seal, wherein each rotating blade has an exit edge which extends beyond the downstream-most row of honeycomb cells.
9. A honeycomb labyrinth seal as recited claim 8, wherein a downstream-most row of honeycomb cells extends beyond the exit edge of the base portion.
10. A honeycomb labyrinth seal as recited in claim 8 wherein the passages extend circumferentially adjacent the base portion.
4. A honeycomb labyrinth seal as recited in claim 8, wherein the passages are grooves disposed in the base portion.
12. A honeycomb labyrinth seal as recited in claim 8, wherein the cells are hexagonally shaped.
13. A honeycomb labyrinth seal as recited in claim 8, wherein the downstream-most row of honeycomb cells is centered over a strip of the base portion formed between the exit edge and the downstream-most passage, so that a portion of each cell in the downstream-most row of honeycomb cells overhangs the base portion.
14. A honeycomb labyrinth seal as claimed in claim 13, wherein the overhanging portion of each cell of the downstream-most row of honeycomb cells is substantially equal to one half the width of the passages.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US47047090A | 1990-01-26 | 1990-01-26 | |
| US470,470 | 1990-01-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2034980A1 true CA2034980A1 (en) | 1991-07-27 |
Family
ID=23867747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002034980A Abandoned CA2034980A1 (en) | 1990-01-26 | 1991-01-25 | Labyrinth seal for steam turbines |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPH0711243B2 (en) |
| KR (1) | KR0178983B1 (en) |
| CN (1) | CN1024705C (en) |
| CA (1) | CA2034980A1 (en) |
| ES (1) | ES2027908A6 (en) |
| IT (1) | IT1245493B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6485025B1 (en) * | 2000-11-27 | 2002-11-26 | Neomet Limited | Metallic cellular structure |
| CN101906994B (en) * | 2009-06-04 | 2012-05-23 | 中国石油化工集团公司 | High-temperature axial-flow type tail gas turbine |
| JP2013204795A (en) * | 2012-03-29 | 2013-10-07 | Mitsubishi Heavy Ind Ltd | Seal device |
| CN106640741B (en) * | 2017-01-04 | 2022-08-02 | 珠海格力节能环保制冷技术研究中心有限公司 | Sealing member, compressor and air conditioner |
-
1991
- 1991-01-16 IT ITMI910093A patent/IT1245493B/en active IP Right Grant
- 1991-01-24 JP JP3007050A patent/JPH0711243B2/en not_active Expired - Lifetime
- 1991-01-25 KR KR1019910001303A patent/KR0178983B1/en not_active IP Right Cessation
- 1991-01-25 ES ES9100197A patent/ES2027908A6/en not_active Expired - Lifetime
- 1991-01-25 CA CA002034980A patent/CA2034980A1/en not_active Abandoned
- 1991-01-26 CN CN91100475.0A patent/CN1024705C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ES2027908A6 (en) | 1992-06-16 |
| JPH04214905A (en) | 1992-08-05 |
| CN1024705C (en) | 1994-05-25 |
| ITMI910093A0 (en) | 1991-01-16 |
| JPH0711243B2 (en) | 1995-02-08 |
| IT1245493B (en) | 1994-09-27 |
| KR0178983B1 (en) | 1999-03-20 |
| ITMI910093A1 (en) | 1992-07-16 |
| CN1053659A (en) | 1991-08-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |