CN110925427A - Turbine shoulder blade non-locating surface auxiliary sealing structure and turbine shoulder blade - Google Patents
Turbine shoulder blade non-locating surface auxiliary sealing structure and turbine shoulder blade Download PDFInfo
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- CN110925427A CN110925427A CN201911341324.0A CN201911341324A CN110925427A CN 110925427 A CN110925427 A CN 110925427A CN 201911341324 A CN201911341324 A CN 201911341324A CN 110925427 A CN110925427 A CN 110925427A
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- ring
- sealing
- groove
- turbine
- sleeve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
- F16J15/184—Tightening mechanisms
- F16J15/185—Tightening mechanisms with continuous adjustment of the compression of the packing
- F16J15/186—Tightening mechanisms with continuous adjustment of the compression of the packing using springs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
- F16J15/24—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings with radially or tangentially compressed packing
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Gasket Seals (AREA)
Abstract
The invention provides a turbine scapula non-positioning surface auxiliary sealing structure and a turbine scapula, belonging to the technical field of turbine sealing, wherein the turbine scapula non-positioning surface auxiliary sealing structure is used for being arranged in a sealing groove formed on a non-positioning surface between a first part sleeve and a second part sleeve to realize sealing and comprises a ring body; the outer ring of the ring body is provided with a first ring groove, and the inner ring is provided with a second ring groove; the first ring groove is used for being matched with the first convex ring in the sealing groove to realize sealing positioning; the second annular groove is used for being matched with a second convex ring in the sealing groove to realize sealing and positioning. Starting from the aspects of sealing ring design, circumferential clearance elimination through matching of the linear expansion coefficients of the materials of the mounting portion sleeve and the sealing ring, sufficient pressing force provided by the type selection of the sealing spring and the like, the secondary soft sealing is carried out on the auxiliary positioning surface by utilizing the characteristic that the non-positioning surface is not easy to deform without additional stress, the scapular sealing performance is effectively improved, and the unit economy is improved.
Description
Technical Field
The invention relates to the technical field of turbine sealing, in particular to a turbine shoulder blade non-positioning surface auxiliary sealing structure and a turbine shoulder blade.
Background
For a long time, all matching part sleeves of a steam turbine can only passively press the positioning surfaces of the part sleeves to realize end surface sealing by means of steam pressure difference, and feasible and reliable methods and structures for sealing non-positioning surfaces are lacked. In the actual operation of the steam turbine, the positioning (sealing) surface of the sleeve is often deformed due to factors such as large stress, local rigidity difference and the like, so that the sealing performance is reduced, steam leakage occurs, and the economical efficiency of the unit is influenced.
Disclosure of Invention
The invention provides a turbine shoulder blade non-positioning surface auxiliary sealing structure and a turbine shoulder blade, and aims to solve the problems of the turbine shoulder blade non-positioning surface auxiliary sealing structure and the turbine shoulder blade in the prior art.
The invention is realized by the following steps:
a turbine shoulder non-positioning surface auxiliary sealing structure is used for sealing in a sealing groove formed in a non-positioning surface between a first part sleeve and a second part sleeve and comprises a ring body;
the outer ring of the ring body is provided with a first ring groove, and the inner ring is provided with a second ring groove;
the first ring groove is used for being matched with the first convex ring in the sealing groove to realize sealing positioning;
the second annular groove is used for being matched with a second convex ring in the sealing groove to realize sealing and positioning.
In one embodiment of the invention, the ring body further has a first ring side;
the first ring side is provided with at least one spring groove.
In an embodiment of the present invention, the spring further comprises a spring, and the spring is disposed in the corresponding spring groove.
In one embodiment of the invention, the ring body further has a second ring side;
the second ring side is provided with a toothed surface for directly contacting the wall surface of the portion sleeve.
In an embodiment of the invention, the second ring side of the ring body is a convex arc surface, and the tooth-shaped surface is disposed at a top of the convex arc surface.
In one embodiment of the present invention, the ring body is divided into four ring segments;
two spaced first connecting positions and two spaced second connecting positions are formed among the four ring segments;
the first connecting part is provided with a circumferential connecting surface and two separated radial connecting surfaces, and the radial connecting surface close to the inner ring forms a mounting gap.
In one embodiment of the invention, the second connection has a circumferential connection surface and two separate radial connection surfaces, each forming an expansion gap therebetween.
A turbine shoulder blade comprises a first part sleeve, a second part sleeve and the ring body in the turbine shoulder blade non-positioning surface auxiliary sealing structure;
the first part sleeve is provided with an outer ring groove, and the inner ring of the second part sleeve is provided with a mounting ring extending into the outer ring groove;
the mounting ring is accommodated in the outer ring groove, and a positioning surface and a non-positioning surface are respectively formed on two sides of the mounting ring;
the non-positioning surface of the mounting ring is provided with the sealing groove, and the sealing groove is internally provided with the corresponding first convex ring and the second convex ring;
the ring body is arranged in the sealing groove, the first annular groove is matched with the first convex ring, and the second annular groove is matched with the second convex ring.
In an embodiment of the present invention, after the ring body is installed at normal temperature, a thermal expansion reserved gap is further provided between the first convex ring and the first ring groove and/or between the second convex ring and the second ring groove.
In an embodiment of the invention, the first part sleeve is an inner cylinder or a clapboard sleeve or a gland body; the second portion cover is the outer cylinder.
The invention has the beneficial effects that: the steam turbine shoulder blade upgrades the single-layer seal of the traditional steam turbine shoulder blade into double-layer seal, and fills the gap of the seal of the non-positioning surface of the steam turbine shoulder blade for a long time; the double-layer sealing structure for sealing the scapular positioning surface and assisting the non-positioning surface of the steam turbine can effectively improve the sealing performance of the scapular of the steam turbine, greatly reduce the steam leakage risk of the scapular of the steam turbine, and prevent the front and the back of the scapular from forming an open channel to generate steam leakage to the maximum extent even if the positioning surface slightly deforms after the unit runs for a long time; this structure can be for reducing the interior hourglass of steam turbine, improves unit efficiency. Starting from the aspects of sealing ring design, circumferential clearance elimination through matching of the linear expansion coefficients of the materials of the mounting portion sleeve and the sealing ring, sufficient pressing force provided by the type selection of the sealing spring and the like, the secondary soft sealing is carried out on the auxiliary positioning surface by utilizing the characteristic that the non-positioning surface is not easy to deform without additional stress, the scapular sealing performance is effectively improved, and the unit economy is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a cross-sectional view of a turbine shoulder blade provided by an embodiment of the present invention;
FIG. 2 is a schematic structural view of a ring body provided by an embodiment of the present invention;
FIG. 3 is an enlarged view of a portion of area A of FIG. 2;
fig. 4 is a partially enlarged view of the region B in fig. 2.
Icon: 100-a first sleeve; 200-a second sleeve; 110-outer ring grooves; 210-a mounting ring; 101-a positioning surface; 103-a non-positioning surface; 230-a seal groove; 231-a first bulge loop; 233-second convex ring; 300-ring body; 310-a first ring groove; 330-a second ring groove; 301-first connection; 303-second junction; 3011-a circumferential connection face; 3031-a radial joint face; 400-a spring; 350-spring groove; 370-toothed surface.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature may be present on or under the second feature in direct contact with the first and second feature, or may be present in the first and second feature not in direct contact but in contact with another feature between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Examples
The embodiment provides a turbine shoulder blade, please refer to fig. 1 and fig. 2, the turbine shoulder blade comprises a first sleeve 100, a second sleeve 200 and a turbine shoulder blade non-positioning surface auxiliary sealing structure;
in this embodiment, the first sleeve 100 is an outer casing and the second sleeve 200 is an inner casing, and specifically, in actual use, the second sleeve 200 may also be a spacer sleeve or a gland casing directly engaged with the outer casing due to different structural arrangements of the steam turbine.
The first part sleeve 100 is provided with an outer ring groove 110, and the inner ring of the second part sleeve 200 is provided with a mounting ring 210 extending into the outer ring groove 110;
the mounting ring 210 is accommodated in the outer ring groove 110, and a positioning surface 101 and a non-positioning surface 103 are respectively formed on two sides of the mounting ring 210;
the non-positioning surface 103 of the mounting ring 210 is provided with a sealing groove 230, the sealing groove 230 is provided with a first convex ring 231 and a second convex ring 233 which are corresponding, the first convex ring 231 is arranged at the side far away from the axis in the sealing groove 230, and the second convex ring 233 is arranged at the side close to the axis in the sealing groove 230.
The ring body 300 of the turbine shoulder blade non-positioning surface auxiliary sealing structure is arranged in the sealing groove 230, the outer ring of the ring body 300 is provided with a first ring groove 310, and the inner ring is provided with a second ring groove 330; the first ring groove 310 cooperates with the first protruding ring 231 to achieve positioning and thermal sealing, and the second ring groove 330 cooperates with the second protruding ring 233 to achieve positioning and thermal sealing. In order to facilitate the insertion of the ring body 300 and on the other hand to relieve internal stress, the ring body 300 is provided with four ring segments;
referring to fig. 2, 3 and 4, two spaced first joints 301 and two spaced second joints 303 are formed between the four ring segments;
the first connecting part 301 distributed at intervals up and down is provided with a circumferential connecting surface 3011 and two separated radial connecting surfaces 3031, and the radial connecting surfaces 3031 close to the inner ring form a mounting gap which is convenient to mount.
Correspondingly, the second connection parts 303 distributed at intervals on the left and right sides also have circumferential connection surfaces 3011 and two separated radial connection surfaces 3031, and an expansion gap is formed between the two radial connection surfaces 3031, the expansion gap should match the thermal expansion difference between the ring body 300 and the second sleeve 200, and the expansion gap is eliminated in a thermal state by utilizing the characteristics of different thermal expansion coefficients of different materials.
Specifically, the ring body 300 should be made of a material having a coefficient of linear expansion greater than that of the second sleeve 200, so as to prevent the ring body 300 from being expanded by the second sleeve 200 in a hot state to generate a circumferential gap and steam leakage.
After the ring 210 body is installed at normal temperature, a thermal expansion reserved gap is also formed between the first convex ring 231 and the first ring groove 310 and/or between the second convex ring 233 and the second ring groove 330. The thermal expansion allowance gap is calculated by the linear expansion coefficient of the material, and after the thermal expansion allowance gap is reserved, the ring body 300 can freely move in the sealing groove 230 in the axial direction, and in a hot state, the first convex ring 231 and the first ring groove 310 and the second convex ring 233 and the second ring groove 330 are tightly attached to each other through the material expansion difference, so that steam leakage is avoided.
The turbine scapula non-positioning surface auxiliary sealing structure further comprises a plurality of springs 400, and the ring body 300 is further provided with a first ring side; the first ring side is provided with a plurality of spring 400 grooves, and the springs 400 are disposed in the corresponding spring 400 grooves. In the actual layout of the springs 400, a corresponding stiffness, a corresponding number of springs 400 are arranged according to the sealing stress required for the sealing rings.
The ring body 300 also has a second ring side opposite the first ring side; the second ring side is provided with a toothed surface 370 for direct contact with the wall surface of the sleeve. Specifically, the second ring side of the ring body 300 is a convex arc surface, and the tooth-shaped surface 370 is disposed at the top of the convex arc surface. The design of the tooth-shaped surface 370 can reduce the contact area, thereby increasing the contact stress and enhancing the sealing performance.
The steam turbine shoulder blade upgrades the single-layer seal of the traditional steam turbine shoulder blade into double-layer seal, and fills the gap of the seal of the non-positioning surface 103 of the steam turbine shoulder blade for a long time; the double-layer sealing structure for sealing the turbine shoulder blade positioning surface 101 and assisting sealing the non-positioning surface 103 can effectively improve the sealing performance of the turbine shoulder blades and greatly reduce the steam leakage risk of the turbine shoulder blades, and even if the unit runs for a long time, the positioning surface 101 slightly deforms, and the assisting sealing of the non-positioning surface 103 can prevent the front and the back of the shoulder blades from forming an open channel to generate steam leakage to the maximum extent; this structure can be for reducing the interior hourglass of steam turbine, improves unit efficiency. Starting from the aspects of eliminating circumferential gaps due to the design of the sealing ring, matching of linear expansion coefficients of materials of the mounting portion sleeve and the sealing ring, providing enough pressing force for the type selection of the sealing spring 400 and the like, the secondary soft sealing is performed on the auxiliary positioning surface 101 by utilizing the characteristic that the non-positioning surface 103 is not additionally stressed and is not easy to deform, the shoulder blade sealing performance is effectively improved, and the unit economy is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A turbine scapular non-positioning surface auxiliary sealing structure is characterized by being used for realizing sealing in a sealing groove formed in a non-positioning surface between a first part sleeve and a second part sleeve, and comprising a ring body;
the outer ring of the ring body is provided with a first ring groove, and the inner ring is provided with a second ring groove;
the first ring groove is used for being matched with the first convex ring in the sealing groove to realize sealing positioning;
the second annular groove is used for being matched with a second convex ring in the sealing groove to realize sealing and positioning.
2. The turbine scapula neutral surface secondary seal structure of claim 1, wherein the ring body further has a first ring side;
the first ring side is provided with at least one spring groove.
3. The turbine shoulder blade non-locating surface secondary seal structure of claim 2, further comprising springs disposed in corresponding spring slots.
4. The turbine scapula neutral surface secondary seal structure of claim 2, wherein the ring body further has a second ring side;
the second ring side is provided with a toothed surface for directly contacting the wall surface of the portion sleeve.
5. The turbine shoulder blade non-locating surface secondary seal structure of claim 4, wherein the second ring side of the ring body is a convexly curved surface, the toothed surface being disposed at a top of the convexly curved surface.
6. The turbine shoulder blade non-locating surface auxiliary seal structure according to claim 1, wherein the ring body is divided into four ring segments;
two spaced first connecting positions and two spaced second connecting positions are formed among the four ring segments;
the first connecting part is provided with a circumferential connecting surface and two separated radial connecting surfaces, and the radial connecting surface close to the inner ring forms a mounting gap.
7. The turbine shoulder blade non-locating surface secondary seal structure of claim 6, wherein the second joint has a circumferential joint surface and two separate radial joint surfaces, each forming an expansion gap therebetween.
8. A turbine scapula comprising a first sleeve, a second sleeve and the ring body in the turbine scapula non-locating face auxiliary seal structure according to any one of claims 1 to 7;
the first part sleeve is provided with an outer ring groove, and the inner ring of the second part sleeve is provided with a mounting ring extending into the outer ring groove;
the mounting ring is accommodated in the outer ring groove, and a positioning surface and a non-positioning surface are respectively formed on two sides of the mounting ring;
the non-positioning surface of the mounting ring is provided with the sealing groove, and the sealing groove is internally provided with the corresponding first convex ring and the second convex ring;
the ring body is arranged in the sealing groove, the first annular groove is matched with the first convex ring, and the second annular groove is matched with the second convex ring.
9. The turbine shoulder blade of claim 8, wherein a thermal expansion clearance is provided between the first protruding ring and the first ring groove and/or between the second protruding ring and the second ring groove after the ring body is mounted at normal temperature.
10. The turbine shoulder blade of claim 8, wherein the first sleeve is an inner casing or spacer sleeve or gland body; the second portion cover is the outer cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911341324.0A CN110925427A (en) | 2019-12-23 | 2019-12-23 | Turbine shoulder blade non-locating surface auxiliary sealing structure and turbine shoulder blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911341324.0A CN110925427A (en) | 2019-12-23 | 2019-12-23 | Turbine shoulder blade non-locating surface auxiliary sealing structure and turbine shoulder blade |
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| Publication Number | Publication Date |
|---|---|
| CN110925427A true CN110925427A (en) | 2020-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911341324.0A Pending CN110925427A (en) | 2019-12-23 | 2019-12-23 | Turbine shoulder blade non-locating surface auxiliary sealing structure and turbine shoulder blade |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101761363A (en) * | 2009-12-28 | 2010-06-30 | 东方电气集团东方汽轮机有限公司 | Sealing structure of scapular of diaphragm of steam turbine |
| CN203146034U (en) * | 2013-02-19 | 2013-08-21 | 浙江浙能能源技术有限公司 | Radial sealing device capable of preventing structural internal leakage of cylinder of steam turbine |
| CN204344695U (en) * | 2014-12-04 | 2015-05-20 | 哈尔滨三源汽轮机设备制造有限责任公司 | A kind of steam turbine set bearing shell flinger ring |
| DE102014008528A1 (en) * | 2014-06-07 | 2015-12-17 | Man Truck & Bus Ag | Sealing arrangement, preferably for an exhaust tract of a motor vehicle |
| CN105736701A (en) * | 2014-12-15 | 2016-07-06 | 凯登环形密封股份有限公司 | Arch-bound ring seal and ring seal system including an arch-bound ring seal |
| CN205388159U (en) * | 2016-02-24 | 2016-07-20 | 宁波日安阀门有限公司 | Stop valve |
| US20170002955A1 (en) * | 2015-06-30 | 2017-01-05 | Prater Industries, Inc. | Rotary Valve Seal Pressure and Indicator System |
| CN206943427U (en) * | 2017-07-12 | 2018-01-30 | 沈阳北碳密封有限公司 | A kind of dissection type ripple spring carbon ring seal |
| CN108757054A (en) * | 2018-06-29 | 2018-11-06 | 东方电气集团东方汽轮机有限公司 | A kind of turbine baffle seal structure |
| CN109386614A (en) * | 2018-10-18 | 2019-02-26 | 华电电力科学研究院有限公司 | A kind of steam turbine oil scraper ring and its application method |
-
2019
- 2019-12-23 CN CN201911341324.0A patent/CN110925427A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101761363A (en) * | 2009-12-28 | 2010-06-30 | 东方电气集团东方汽轮机有限公司 | Sealing structure of scapular of diaphragm of steam turbine |
| CN203146034U (en) * | 2013-02-19 | 2013-08-21 | 浙江浙能能源技术有限公司 | Radial sealing device capable of preventing structural internal leakage of cylinder of steam turbine |
| DE102014008528A1 (en) * | 2014-06-07 | 2015-12-17 | Man Truck & Bus Ag | Sealing arrangement, preferably for an exhaust tract of a motor vehicle |
| CN204344695U (en) * | 2014-12-04 | 2015-05-20 | 哈尔滨三源汽轮机设备制造有限责任公司 | A kind of steam turbine set bearing shell flinger ring |
| CN105736701A (en) * | 2014-12-15 | 2016-07-06 | 凯登环形密封股份有限公司 | Arch-bound ring seal and ring seal system including an arch-bound ring seal |
| US20170002955A1 (en) * | 2015-06-30 | 2017-01-05 | Prater Industries, Inc. | Rotary Valve Seal Pressure and Indicator System |
| CN205388159U (en) * | 2016-02-24 | 2016-07-20 | 宁波日安阀门有限公司 | Stop valve |
| CN206943427U (en) * | 2017-07-12 | 2018-01-30 | 沈阳北碳密封有限公司 | A kind of dissection type ripple spring carbon ring seal |
| CN108757054A (en) * | 2018-06-29 | 2018-11-06 | 东方电气集团东方汽轮机有限公司 | A kind of turbine baffle seal structure |
| CN109386614A (en) * | 2018-10-18 | 2019-02-26 | 华电电力科学研究院有限公司 | A kind of steam turbine oil scraper ring and its application method |
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Application publication date: 20200327 |