CN103644000A - Steam seal structure between stator components of steam turbine - Google Patents
Steam seal structure between stator components of steam turbine Download PDFInfo
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- CN103644000A CN103644000A CN201310702342.3A CN201310702342A CN103644000A CN 103644000 A CN103644000 A CN 103644000A CN 201310702342 A CN201310702342 A CN 201310702342A CN 103644000 A CN103644000 A CN 103644000A
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- seal
- seal ring
- radial
- stator part
- steam turbine
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Abstract
The invention provides a steam seal structure between stator components of a steam turbine. A seal groove is formed in a seal surface between the stator components; a seal ring is arranged in the seal groove and comprises a radial seal surface and an axial seal surface; radial springs and axial springs are also arranged in the seal groove; two ends of each radial spring are propped with the bottom surface of the seal groove and the radial seal surface of the seal ring respectively, and two ends of each axial spring are propped with the side surface of the seal groove and the axial seal surface of the seal ring respectively, so that directions of forces exerted by the radial springs and the axial springs to the seal ring are consistent with that of a force produced by a steam pressure difference. According to the steam seal structure between the stator components of the steam turbine, radial steam seal and axial steam seal between the stator components are guaranteed, the seal performance of the stator components is improved, steam leakage of the stator components is effectively reduced, and the efficiency and the safety of the steam turbine are improved.
Description
Technical field
The present invention relates to steam turbine, specifically the gland seal structure between a kind of steam turbine stator part and sealing gland thereof.
Background technique
In large-scale steam turbine conventional design, in order to reduce the steam leakage between stator part, between stator part, be provided with quiet to static seal.As shown in Figure 1, 2, between cylinder 1 end face and rotor, be provided with labyrinth casing 4, in order further to strengthen the static seal between labyrinth casing 4 and cylinder 1 end face, on labyrinth casing 4 and cylinder 1 end contact position, be provided with several sealing glands 4.Concrete, sealing gland 4 is mounted in the groove on labyrinth casing 4 outer circumferential faces, sealing gland 4 consists of seal ring 5 and spring sheet 6, seal ring 5 outer circumferential faces be the flat flank of tooth, with cylinder 1 end contact, spring sheet 6 is arranged on inside grooves, the elastic force by spring sheet 6 radially top tight sealing circle 5, make seal ring 5 outer circumferential faces and cylinder 1 end face form gland seal structure; Seal ring 5 both sides are owing to having inside and outside differential pressure, seal ring 5 is axially contacted with labyrinth casing 4 shoulders and forms sealing.
But when the radial spring power that inside and outside differential pressure is too small or spring sheet 6 provides of seal ring 5 both sides is excessive, seal ring 5 may lose efficacy with the shoulder sealing of labyrinth casing 4, made to leak vapour between labyrinth casing 4 and cylinder 1, caused serious consequence.
Summary of the invention
In order to solve the packing problem of steam turbine stator part end, provide the gland seal structure between a kind of steam turbine stator part.
The technical solution adopted in the present invention is:
A gland seal structure between steam turbine stator part, is provided with seal groove on the sealing surface between described stator part, is provided with seal ring in seal groove, and sealing circle has radial sealing surfaces and axial seal face; In described seal groove, be also provided with radial spring and axle spring; The radial sealing surfaces of radial spring two ends difference top tight sealing groove bottom and seal ring, the axial seal face of difference top tight sealing groove side, axle spring two ends and seal ring, guarantees that the direction of the power that radial spring produces with steam pressure difference the power of seal ring with axle spring is consistent.
Described radial spring and axle spring are circumferentially uniformly distributed, are crisscross arranged along seal ring.
On described seal ring inner peripheral surface or outer circumferential face, be provided with radially flange collar, radially flange collar is radial sealing surfaces, contacts with stator part.
On described seal ring left surface or right flank, be provided with axial flange collar, the corresponding position on seal groove is provided with limited impression, and axially flange collar is axial seal face, contacts with the limited impression of seal groove.
Described radial sealing surfaces is the flat flank of tooth or plane.
Described axial seal face is the flat flank of tooth or plane.
Described seal ring is segmental structure, along being circumferentially divided into several segmental arcs, between adjacent segmental arc, leaves clearance for expansion.
On described seal ring split, be connected with screw by pressing plate between adjacent segmental arc.
The beneficial effect that the present invention produces is:
Gland seal structure between steam turbine stator part of the present invention, has guaranteed radial gland and axial packing between stator part; Improve the sealability of stator part, effectively reduced the steam leakage of stator part, improved efficiency and the Security of steam turbine.
Accompanying drawing explanation
Fig. 1 is the gland seal structure schematic diagram of steam turbine stator part;
Fig. 2 is the structural representation of the sealing gland of steam turbine stator part in prior art;
Fig. 3 is the ring structure schematic diagram of sealing gland the first mode of execution of the present invention;
Fig. 4 is the layout schematic diagram of sealing gland the first mode of execution of the present invention;
Fig. 5 is the seal ring cross section structure schematic diagram of 1-1 kind in sealing gland the first mode of execution of the present invention;
Fig. 6 is the seal ring cross section structure schematic diagram of 1-2 kind in sealing gland the first mode of execution of the present invention;
Fig. 7 is the seal ring cross section structure schematic diagram of 1-3 kind in sealing gland the first mode of execution of the present invention;
Fig. 8 is the seal ring cross section structure schematic diagram of 1-4 kind in sealing gland the first mode of execution of the present invention;
Fig. 9 is the ring structure schematic diagram of sealing gland the second mode of execution of the present invention;
Figure 10 is the layout schematic diagram of sealing gland the second mode of execution of the present invention;
Figure 11 is the seal ring cross section structure schematic diagram of 2-1 kind in sealing gland the second mode of execution of the present invention;
Figure 12 is the seal ring cross section structure schematic diagram of 2-2 kind in sealing gland the second mode of execution of the present invention;
Figure 13 is the seal ring cross section structure schematic diagram of 2-3 kind in sealing gland the second mode of execution of the present invention;
Figure 14 is the seal ring cross section structure schematic diagram of 2-4 kind in sealing gland the second mode of execution of the present invention;
Figure 15 is the ring structure schematic diagram of the third mode of execution of sealing gland of the present invention;
Figure 16 is the layout schematic diagram of the third mode of execution of sealing gland of the present invention;
Figure 17 is the seal ring cross section structure schematic diagram of 3-1 kind in the third mode of execution of sealing gland of the present invention;
Figure 18 is the seal ring cross section structure schematic diagram of 3-2 kind in the third mode of execution of sealing gland of the present invention;
Figure 19 is the seal ring cross section structure schematic diagram of 3-3 kind in the third mode of execution of sealing gland of the present invention;
Figure 20 is the seal ring cross section structure schematic diagram of 3-4 kind in the third mode of execution of sealing gland of the present invention;
Figure 21 is the ring structure schematic diagram of the 4th kind of mode of execution of sealing gland of the present invention;
Figure 22 is the layout schematic diagram of the 4th kind of mode of execution of sealing gland of the present invention;
Figure 23 is the seal ring cross section structure schematic diagram of 4-1 kind in the 4th kind of mode of execution of sealing gland of the present invention;
Figure 24 is the seal ring cross section structure schematic diagram of 4-2 kind in the 4th kind of mode of execution of sealing gland of the present invention;
Figure 25 is the seal ring cross section structure schematic diagram of 4-3 kind in the 4th kind of mode of execution of sealing gland of the present invention;
Figure 26 is the seal ring cross section structure schematic diagram of 4-4 kind in the 4th kind of mode of execution of sealing gland of the present invention.
Number in the figure represents: 1-cylinder, 2-packing chamber, 3-sealing gland, 4-labyrinth casing, 5-seal ring, 6-spring sheet, 7-radial spring, 8-axle spring, 9-pressing plate, 10-screw, 11-rotor, the flat flank of tooth of m-, n-plane.
Embodiment
As shown in Fig. 1～26, the present invention is the gland seal structure between a kind of steam turbine stator part.On sealing surface between stator part, be provided with seal groove, be provided with seal ring 5 in seal groove, sealing circle 5 has radial sealing surfaces and axial seal face.In this embodiment: be provided with radially flange collar on the inner peripheral surface of seal ring 5 or outer circumferential face, radially flange collar is radial sealing surfaces, contacts with stator part; On seal ring 5 left surfaces or right flank, be provided with axial flange collar, the corresponding position on seal groove is provided with limited impression, and axially flange collar is axial seal face, contacts with the limited impression of seal groove.
Radial sealing surfaces is flat flank of tooth m or Plane n, and in like manner, axial seal face is flat flank of tooth m or Plane n.
In seal groove, be also provided with radial spring 7 and axle spring 8, concrete: the radial sealing surfaces of radial spring 7 two ends difference top tight sealing groove bottom and seal ring 5; The axial seal face of axle spring 8 difference top tight sealing groove sides, two ends and seal ring 5.The power that guarantees 8 pairs of seal rings 5 of radial spring 7 and axle spring is consistent with the direction of the power of steam pressure difference generation.
In this embodiment, the gland seal structure between steam turbine stator part comprises: stator part A, B, seal groove can be arranged on stator part A, can be arranged on stator part B, be arranged on stator part A and B even simultaneously.In seal groove, be provided with seal ring 5, radial spring 7 and axle spring 8, seal ring 5 has inside and outside two circumferential surfacies, side, two of left and right.
Wherein: inner peripheral surface and the stator part B of the outer peripheral surface of seal ring 5 and stator part A laminating or seal ring 5, form radial sealing surfaces; The right flank of the left surface of seal ring 5 and the laminating of seal groove right flank or seal ring 5 and the laminating of seal groove left surface, form axial seal face.Radial sealing surfaces can be directly inner peripheral surface or the outer circumferential face of seal ring 5, and axial seal face can be directly left surface or the right flank of seal ring 5.The radial sealing surfaces of seal ring 5 and axial seal face can be also the forms that adopts flange collar, strengthen and the contacting of stator part, effective packing.
If radial spring 7 is arranged on seal ring 5, in the contrary side of seal ring 5 radial sealing surfaces, have circular hole, circular hole is along the circumferential direction uniformly distributed, for radial spring 7, pack into, radial spring 7 is cylindrical spring, the sealing load that applies radial direction to seal ring 5, guarantee its radial sealing surfaces contact sealing, guarantee that the power of 7 pairs of seal rings 5 of radial spring is consistent with the direction of the power of steam pressure difference generation.
If radial spring 7 is arranged on seal groove, in seal groove bottom, radially continue out circular hole, circular hole is along the circumferential direction uniformly distributed, for radial spring 7, pack into, radial spring 7 is cylindrical spring, the sealing load that applies radial direction to seal ring 5, guarantee its radial sealing surfaces contact sealing, guarantee that the power of 7 pairs of seal rings 5 of radial spring is consistent with the direction of the power of steam pressure difference generation.
If axle spring 8 is arranged on seal ring 5, in the contrary side of seal ring 5 axial seal faces, have circular hole, circular hole is along the circumferential direction uniformly distributed, for axle spring 8, pack into, axle spring 8 is cylindrical spring, the sealing load that applies axial direction to seal ring 5, guarantee its axial seal face contact sealing, guarantee that the power of 8 pairs of seal rings 5 of axle spring is consistent with the direction of the power of steam pressure difference generation.
Embodiment one
As shown in Fig. 3～Fig. 8, be sealing gland the first mode of execution of the present invention, i.e. the first structure and setting type thereof.Concrete:
On the labyrinth casing 4 of seal ring 5 inner circumferential side, have circular groove, seal ring 5 is placed in circular groove; The circular hole that distributing uniformly on the inner peripheral surface of seal ring 5, radial spring 7 is arranged in circular hole, and seal ring 5 is radially pushed up to cylinder 1 end face, guarantees sealing surface contact, forms radial seal; Left surface edge at seal ring 5 circumferentially also has circular hole uniformly, and axle spring 8 is installed in hole, and axle spring 8 heads on seal ring 5 vertically, guarantees that the convex shoulder of seal ring 5 right flanks contacts with labyrinth casing 4, forms axial seal.
As shown in 1-1,1-2,1-3 and 1-4 structural type, axial seal face and radial sealing surfaces can be all flat flank of tooth m, also can be all Plane n; Or axial seal face is that flat flank of tooth m, radial sealing surfaces are Plane n; Or axial seal face is that Plane n, radial sealing surfaces are flat flank of tooth m.
Embodiment two
As shown in Fig. 9～Figure 14, be sealing gland the second mode of execution of the present invention, i.e. the second structure and setting type.Concrete:
On cylinder 1 end face of seal ring 1 outer circumferential sides, have circular groove, seal ring 5 is placed in circular groove; The circular hole that distributing uniformly on the outer peripheral surface of seal ring 5, radial spring 7 is arranged in circular hole, and seal ring 5 is radially pushed up to labyrinth casing 4, guarantees sealing surface contact, forms radial seal; Left surface edge at seal ring 5 circumferentially also has circular hole uniformly, and axle spring 8 is installed in hole, and axle spring 8 heads on seal ring 5 vertically, guarantees that the convex shoulder of seal ring 5 right flanks contacts with cylinder 1, forms axial seal.
As shown in 2-1,2-2,2-3 and 2-4 structural type, axial seal face and radial sealing surfaces can be all flat flank of tooth m, also can be all Plane n; Or axial seal face is that flat flank of tooth m, radial sealing surfaces are Plane n; Or axial seal face is that Plane n, radial sealing surfaces are flat flank of tooth m.
Embodiment three
As shown in Figure 15～Figure 20, the third mode of execution of sealing gland of the present invention, i.e. the third structure and setting type.Concrete:
On the labyrinth casing 4 of seal ring 5 inner circumferential side, have circular groove, seal ring 5 is placed in circular groove; Bottom at the circular groove of labyrinth casing 4 is circumferentially uniform-distribution with circular hole, and radial spring 7 is arranged in circular hole, and seal ring 5 is radially pushed up to cylinder 1 end face, guarantees sealing surface contact, forms radial seal; Left surface edge at seal ring 5 circumferentially also has circular hole uniformly, and axle spring 8 is installed in hole, and axle spring 8 heads on seal ring 5 vertically, guarantees that the convex shoulder of seal ring 5 right flanks contacts with labyrinth casing 4, forms axial seal.
As shown in 3-1,3-2,3-3 and 3-4 structural type, axial seal face and radial sealing surfaces can be all flat flank of tooth m, also can be all Plane n; Or axial seal face is that flat flank of tooth m, radial sealing surfaces are Plane n; Or axial seal face is that Plane n, radial sealing surfaces are flat flank of tooth m.
Embodiment four
As shown in Figure 21～Figure 26, the third mode of execution of sealing gland of the present invention, i.e. the third structure and setting type.Concrete:
On seal ring 5 outer circumferential sides cylinder 1 end faces, have circular groove, seal ring 5 is placed in circular groove; Top at the circular groove of cylinder 1 is circumferentially uniform-distribution with circular hole, and radial spring 7 is arranged in circular hole, and seal ring 5 is radially pushed up to labyrinth casing 4, guarantees sealing surface contact, forms radial seal; Left surface edge at seal ring 5 circumferentially also has circular hole uniformly, and axle spring 8 is installed in hole, and axle spring 8 heads on seal ring 5 vertically, guarantees that the convex shoulder of seal ring 5 right flanks contacts with cylinder 1, forms axial seal.
As shown in 4-1,4-2,4-3 and 4-4 structural type, axial seal face and radial sealing surfaces can be all flat flank of tooth m, also can be all Plane n; Or axial seal face is that flat flank of tooth m, radial sealing surfaces are Plane n; Or axial seal face is that Plane n, radial sealing surfaces are flat flank of tooth m.
Claims (8)
1. the gland seal structure between steam turbine stator part, is provided with seal groove on the sealing surface between described stator part, is provided with seal ring in seal groove, and sealing circle has radial sealing surfaces and axial seal face; It is characterized in that: in described seal groove, be also provided with radial spring and axle spring; The radial sealing surfaces of radial spring two ends difference top tight sealing groove bottom and seal ring, the axial seal face of difference top tight sealing groove side, axle spring two ends and seal ring, guarantees that the direction of the power that radial spring produces with steam pressure difference the power of seal ring with axle spring is consistent.
2. the gland seal structure between steam turbine stator part according to claim 1, is characterized in that: described radial spring and axle spring are circumferentially uniformly distributed, are crisscross arranged along seal ring.
3. the gland seal structure between steam turbine stator part according to claim 1, is characterized in that: on described seal ring inner peripheral surface or outer circumferential face, be provided with radially flange collar, radially flange collar is radial sealing surfaces, contacts with stator part.
4. the gland seal structure between steam turbine stator part according to claim 1, it is characterized in that: on described seal ring left surface or right flank, be provided with axial flange collar, corresponding position on seal groove is provided with limited impression, and axially flange collar is axial seal face, contacts with the limited impression of seal groove.
5. the gland seal structure between steam turbine stator part according to claim 1, is characterized in that: described radial sealing surfaces is the flat flank of tooth or plane.
6. the gland seal structure between steam turbine stator part according to claim 1, is characterized in that: described axial seal face is the flat flank of tooth or plane.
7. the gland seal structure between steam turbine stator part according to claim 1, is characterized in that: described seal ring is segmental structure, along being circumferentially divided into several segmental arcs, between adjacent segmental arc, leaves clearance for expansion.
8. the gland seal structure between steam turbine stator part according to claim 7, is characterized in that: on described seal ring split, be connected with screw by pressing plate between adjacent segmental arc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310702342.3A CN103644000B (en) | 2013-12-19 | 2013-12-19 | Gland seal structure between a kind of steam turbine stator part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310702342.3A CN103644000B (en) | 2013-12-19 | 2013-12-19 | Gland seal structure between a kind of steam turbine stator part |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103644000A true CN103644000A (en) | 2014-03-19 |
| CN103644000B CN103644000B (en) | 2015-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310702342.3A Active CN103644000B (en) | 2013-12-19 | 2013-12-19 | Gland seal structure between a kind of steam turbine stator part |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4436311A (en) * | 1982-04-20 | 1984-03-13 | Brandon Ronald E | Segmented labyrinth-type shaft sealing system for fluid turbines |
| US6220603B1 (en) * | 1998-07-13 | 2001-04-24 | Ronald Earl Brandon | Non retractable segmented packing ring for fluid turbines having special springs to reduce forces during shaft rubbing |
| CN2886084Y (en) * | 2005-12-29 | 2007-04-04 | 东方汽轮机厂 | Sealing structure of steam turbine stator part and sealing gland thereof |
| US20120027582A1 (en) * | 2010-08-02 | 2012-02-02 | General Electric Company | Floating packing ring assembly |
| CN202417613U (en) * | 2012-01-11 | 2012-09-05 | 淄博桑特动力设备有限公司 | Carbon-ring-type oil seal device |
| CN102720545A (en) * | 2012-06-28 | 2012-10-10 | 北京龙威发电技术有限公司 | Durable steam sealing structure of steam turbine |
-
2013
- 2013-12-19 CN CN201310702342.3A patent/CN103644000B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4436311A (en) * | 1982-04-20 | 1984-03-13 | Brandon Ronald E | Segmented labyrinth-type shaft sealing system for fluid turbines |
| US6220603B1 (en) * | 1998-07-13 | 2001-04-24 | Ronald Earl Brandon | Non retractable segmented packing ring for fluid turbines having special springs to reduce forces during shaft rubbing |
| CN2886084Y (en) * | 2005-12-29 | 2007-04-04 | 东方汽轮机厂 | Sealing structure of steam turbine stator part and sealing gland thereof |
| US20120027582A1 (en) * | 2010-08-02 | 2012-02-02 | General Electric Company | Floating packing ring assembly |
| CN202417613U (en) * | 2012-01-11 | 2012-09-05 | 淄博桑特动力设备有限公司 | Carbon-ring-type oil seal device |
| CN102720545A (en) * | 2012-06-28 | 2012-10-10 | 北京龙威发电技术有限公司 | Durable steam sealing structure of steam turbine |
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| CN103644000B (en) | 2015-07-29 |
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