CN103644000B - Gland seal structure between a kind of steam turbine stator part - Google Patents
Gland seal structure between a kind of steam turbine stator part Download PDFInfo
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- CN103644000B CN103644000B CN201310702342.3A CN201310702342A CN103644000B CN 103644000 B CN103644000 B CN 103644000B CN 201310702342 A CN201310702342 A CN 201310702342A CN 103644000 B CN103644000 B CN 103644000B
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Abstract
The invention provides the gland seal structure between a kind of steam turbine stator part, the sealing surface between described stator part is provided with seal groove, is provided with seal ring in seal groove, sealing circle has radial sealing surfaces and axial seal face; Radial spring and axle spring is also provided with in described seal groove; 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, ensures that radial spring is consistent with the direction of the power that steam pressure difference produces to the power of seal ring with axle spring.Gland seal structure between steam turbine stator part of the present invention, ensure that the radial gland between stator part and axial packing; Improve the sealability of stator part, significantly reduce the steam leakage of stator part, improve efficiency and the Security of steam turbine.
Description
Technical field
The present invention relates to steam turbine, the gland seal structure specifically between a kind of steam turbine stator part and sealing gland thereof.
Background technique
In Large steam turbine conventional design, in order to reduce the steam leakage between stator part, be provided with quiet to static seal between stator part.As shown in Figure 1, 2, between cylinder 1 end face and rotor, being provided with labyrinth casing 4, in order to strengthen the static seal between labyrinth casing 4 and cylinder 1 end face further, labyrinth casing 4 with cylinder 1 end contact position being provided with several sealing glands 4.Concrete, sealing gland 4 is mounted in the groove on labyrinth casing 4 outer circumferential face, sealing gland 4 is made up of seal ring 5 and spring sheet 6, seal ring 5 outer circumferential face be the flat flank of tooth, with cylinder 1 end contact, spring sheet 6 is arranged on inside grooves, by the radial top tight sealing circle 5 of the elastic force of spring sheet 6, makes seal ring 5 outer circumferential face and cylinder 1 end face form gland seal structure; Seal ring 5 both sides owing to having inside and outside differential pressure, seal ring 5 axially formed with labyrinth casing 4 shoulder contact seal.
But when the radial spring force that the inside and outside differential pressure of seal ring 5 both sides is too small or spring sheet 6 provides is excessive, seal ring 5 seals may lose efficacy with the shoulder of labyrinth casing 4, makes to leak vapour between labyrinth casing 4 and cylinder 1, causes 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, the sealing surface between described stator part is provided with seal groove, is provided with seal ring in seal groove, and sealing circle has radial sealing surfaces and axial seal face; Radial spring and axle spring is also provided with in described seal groove; 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, ensures that radial spring is consistent with the direction of the power that steam pressure difference produces to the power of seal ring with axle spring.
Described radial spring and axle spring are uniformly distributed along seal ring circumference, are crisscross arranged.
Described seal ring inner peripheral surface or outer circumferential face are provided with radial flange collar, and radial flange collar is radial sealing surfaces, contacts with stator part.
Described seal ring left surface or right flank are provided with axial flange collar, and the corresponding position on seal groove is provided with limited impression, and axial 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, is circumferentially divided into several segmental arcs, leaves clearance for expansion between adjacent segmental arc.
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, ensure that the radial gland between stator part and axial packing; Improve the sealability of stator part, significantly reduce the steam leakage of stator part, improve 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 the first mode of execution of sealing gland of the present invention;
Fig. 4 is the layout schematic diagram of the first mode of execution of sealing gland of the present invention;
Fig. 5 is the seal ring cross section structure schematic diagram of 1-1 kind in the first mode of execution of sealing gland of the present invention;
Fig. 6 is the seal ring cross section structure schematic diagram of 1-2 kind in the first mode of execution of sealing gland of the present invention;
Fig. 7 is the seal ring cross section structure schematic diagram of 1-3 kind in the first mode of execution of sealing gland of the present invention;
Fig. 8 is the seal ring cross section structure schematic diagram of 1-4 kind in the first mode of execution of sealing gland 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 sealing gland of the present invention 4th kind of mode of execution;
Figure 22 is the layout schematic diagram of sealing gland of the present invention 4th kind of mode of execution;
Figure 23 is the seal ring cross section structure schematic diagram of 4-1 kind in sealing gland of the present invention 4th kind of mode of execution;
Figure 24 is the seal ring cross section structure schematic diagram of 4-2 kind in sealing gland of the present invention 4th kind of mode of execution;
Figure 25 is the seal ring cross section structure schematic diagram of 4-3 kind in sealing gland of the present invention 4th kind of mode of execution;
Figure 26 is the seal ring cross section structure schematic diagram of 4-4 kind in sealing gland of the present invention 4th kind of mode of execution.
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.Sealing surface between stator part is provided with seal groove, is provided with seal ring 5 in seal groove, sealing circle 5 has radial sealing surfaces and axial seal face.In this embodiment: the inner peripheral surface of seal ring 5 or outer circumferential face are provided with radial flange collar, and radial flange collar is radial sealing surfaces, contacts with stator part; Seal ring 5 left surface or right flank are provided with axial flange collar, and the corresponding position on seal groove is provided with limited impression, and axial 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.
Seal ring 5 is segmental structures, is circumferentially divided into several segmental arcs, leaves very little clearance for expansion between adjacent segmental arc.Be connected with screw 10 by pressing plate 9 on the split of seal ring 5, between adjacent segmental arc, ensure the location of seal ring 1.
Radial spring 7 and axle spring 8 is also provided with in seal groove, 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 difference top tight sealing groove side, axle spring 8 two ends and seal ring 5.Ensure that the power of radial spring 7 and axle spring 8 pairs of seal rings 5 is consistent with the direction of the power that steam pressure difference produces.
Radial spring 7 and axle spring 8 are uniformly distributed along seal ring circumference, are crisscross arranged.
In this embodiment, the gland seal structure between steam turbine stator part comprises: stator part A, B, and seal groove can be arranged on stator part A, can be arranged on and be arranged on stator part A and B on stator part B, even simultaneously.Be provided with seal ring 5, radial spring 7 and axle spring 8 in seal groove, seal ring 5 has inside and outside two circumferential surfacies, side, two, left and right.
Wherein: the outer peripheral surface of seal ring 5 and stator part A fit or the inner peripheral surface of seal ring 5 and stator part B, form radial sealing surfaces; The left surface of seal ring 5 and seal groove right flank are fitted or the right flank of seal ring 5 and seal groove left surface are fitted, and 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 also can be the forms adopting flange collar, strengthen and the contact of stator part, effectively packing.
Radial spring 7 and axle spring 8 can be set directly in the space between seal groove and seal ring 5, can open mounting hole, install for radial spring 7 and/or axle spring 8 on seal ring 5 or seal groove.Concrete:
If radial spring 7 is arranged on seal ring 5, then in seal ring 5 radial sealing surfaces opposite side, have circular hole, circular hole is along the circumferential direction uniformly distributed, load for radial spring 7, radial spring 7 is cylindrical spring, the sealing load applying radial direction to seal ring 5, ensure its radial sealing surfaces contact sealing, ensure that the power of radial spring 7 pairs of seal rings 5 is consistent with the direction of the power that steam pressure difference produces.
If radial spring 7 is arranged on seal groove, namely bottom seal groove, radially circular hole is continued out, circular hole is along the circumferential direction uniformly distributed, load for radial spring 7, radial spring 7 is cylindrical spring, the sealing load applying radial direction to seal ring 5, ensure its radial sealing surfaces contact sealing, ensure that the power of radial spring 7 pairs of seal rings 5 is consistent with the direction of the power that steam pressure difference produces.
If axle spring 8 is arranged on seal ring 5, then in the opposite side of seal ring 5 axial seal face, have circular hole, circular hole is along the circumferential direction uniformly distributed, load for axle spring 8, axle spring 8 is cylindrical spring, the sealing load applying axial direction to seal ring 5, ensure the contact sealing of its axial seal face, ensure that the power of axle spring 8 pairs of seal rings 5 is consistent with the direction of the power that steam pressure difference produces.
Embodiment one
As shown in Fig. 3 ~ Fig. 8, be the first mode of execution of sealing gland of the present invention, i.e. the first structure and setting type thereof.Concrete:
The labyrinth casing 4 of seal ring 5 inner circumferential side has circular groove, and seal ring 5 is placed in circular groove; The inner peripheral surface of seal ring 5 is dispersed with circular hole uniformly, and radial spring 7 is arranged in circular hole, and is radially pushed up by seal ring 5 to cylinder 1 end face, ensures sealing surface contact, forms radial seal; Circumferentially also have circular hole uniformly at the left surface of seal ring 5, be provided with axle spring 8 in hole, axle spring 8 heads on seal ring 5 vertically, ensures that the convex shoulder of seal ring 5 right flank 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 flat flank of tooth m, radial sealing surfaces is Plane n; Or axial seal face be Plane n, radial sealing surfaces is 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:
Cylinder 1 end face of seal ring 1 outer circumferential sides has circular groove, and seal ring 5 is placed in circular groove; The outer peripheral surface of seal ring 5 is dispersed with circular hole uniformly, and radial spring 7 is arranged in circular hole, and radially pushes up to labyrinth casing 4 by seal ring 5, ensures sealing surface contact, forms radial seal; Circumferentially also have circular hole uniformly at the left surface of seal ring 5, be provided with axle spring 8 in hole, axle spring 8 heads on seal ring 5 vertically, ensures that the convex shoulder of seal ring 5 right flank 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 flat flank of tooth m, radial sealing surfaces is Plane n; Or axial seal face be Plane n, radial sealing surfaces is 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:
The labyrinth casing 4 of seal ring 5 inner circumferential side has circular groove, and seal ring 5 is placed in circular groove; Be uniform-distribution with circular hole in the bottom circumference of the circular groove of labyrinth casing 4, radial spring 7 is arranged in circular hole, is radially pushed up by seal ring 5 to cylinder 1 end face, ensures sealing surface contact, forms radial seal; Circumferentially also have circular hole uniformly at the left surface of seal ring 5, be provided with axle spring 8 in hole, axle spring 8 heads on seal ring 5 vertically, ensures that the convex shoulder of seal ring 5 right flank 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 flat flank of tooth m, radial sealing surfaces is Plane n; Or axial seal face be Plane n, radial sealing surfaces is 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:
Seal ring 5 outer circumferential sides cylinder 1 end face has circular groove, and seal ring 5 is placed in circular groove; Be uniform-distribution with circular hole in the top circumference of the circular groove of cylinder 1, radial spring 7 is arranged in circular hole, is radially pushed up by seal ring 5 to labyrinth casing 4, ensures sealing surface contact, forms radial seal; Circumferentially also have circular hole uniformly at the left surface of seal ring 5, be provided with axle spring 8 in hole, axle spring 8 heads on seal ring 5 vertically, ensures that the convex shoulder of seal ring 5 right flank 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 flat flank of tooth m, radial sealing surfaces is Plane n; Or axial seal face be Plane n, radial sealing surfaces is flat flank of tooth m.
Claims (9)
1. the gland seal structure between a steam turbine stator part, labyrinth casing is provided with between cylinder end face and rotor, labyrinth casing and cylinder end face contact position are provided with seal groove, and be provided with seal ring in seal groove, 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; Radial spring is arranged on seal ring, then in seal ring radial sealing surfaces opposite side, have circular hole, circular hole is along the circumferential direction uniformly distributed, load for radial spring, radial spring is cylindrical spring, the sealing load applying radial direction to seal ring, ensure its radial sealing surfaces contact sealing, ensure that radial spring is consistent with the direction of the power that steam pressure difference produces to the power of seal ring; Axle spring is arranged on seal ring, then in the opposite side of seal ring axial seal face, have circular hole, circular hole is along the circumferential direction uniformly distributed, load for axle spring, axle spring is cylindrical spring, the sealing load applying axial direction to seal ring, ensure the contact sealing of its axial seal face, ensure that axle spring is consistent with the direction of the power that steam pressure difference produces to the power of seal ring.
2. the gland seal structure between a steam turbine stator part, labyrinth casing is provided with between cylinder end face and rotor, labyrinth casing and cylinder end face contact position are provided with seal groove, and be provided with seal ring in seal groove, 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; Radial spring is arranged on seal groove, namely bottom seal groove, radially circular hole is continued out, circular hole is along the circumferential direction uniformly distributed, load for radial spring, radial spring is cylindrical spring, the sealing load applying radial direction to seal ring, ensure its radial sealing surfaces contact sealing, ensure that radial spring is consistent with the direction of the power that steam pressure difference produces to the power of seal ring; Axle spring is arranged on seal ring, then in the opposite side of seal ring axial seal face, have circular hole, circular hole is along the circumferential direction uniformly distributed, load for axle spring, axle spring is cylindrical spring, the sealing load applying axial direction to seal ring, ensure the contact sealing of its axial seal face, ensure that axle spring is consistent with the direction of the power that steam pressure difference produces to the power of seal ring.
3. the gland seal structure according to claim 1 or 2 between steam turbine stator part, is characterized in that: described radial spring and axle spring are uniformly distributed along seal ring circumference, are crisscross arranged.
4. the gland seal structure according to claim 1 or 2 between steam turbine stator part, is characterized in that: described seal ring inner peripheral surface or outer circumferential face are provided with radial flange collar, and radial flange collar is radial sealing surfaces, contacts with stator part.
5. the gland seal structure according to claim 1 or 2 between steam turbine stator part, it is characterized in that: described seal ring left surface or right flank are provided with axial flange collar, corresponding position on seal groove is provided with limited impression, and axial flange collar is axial seal face, contacts with the limited impression of seal groove.
6. the gland seal structure according to claim 1 or 2 between steam turbine stator part, is characterized in that: described radial sealing surfaces is the flat flank of tooth or plane.
7. the gland seal structure according to claim 1 or 2 between steam turbine stator part, is characterized in that: described axial seal face is the flat flank of tooth or plane.
8. the gland seal structure according to claim 1 or 2 between steam turbine stator part, is characterized in that: described seal ring is segmental structure, is circumferentially divided into several segmental arcs, leaves clearance for expansion between adjacent segmental arc.
9. the gland seal structure according to claim 8 between steam turbine stator part, 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 |
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| Publication Number | Publication Date |
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| CN103644000A CN103644000A (en) | 2014-03-19 |
| CN103644000B true 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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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113606345A (en) * | 2021-06-21 | 2021-11-05 | 东方电气集团东方汽轮机有限公司 | Air seal assembly and air seal ring |
Citations (5)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120027582A1 (en) * | 2010-08-02 | 2012-02-02 | General Electric Company | Floating packing ring assembly |
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2013
- 2013-12-19 CN CN201310702342.3A patent/CN103644000B/en active Active
Patent Citations (5)
| 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 |
| 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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| CN103644000A (en) | 2014-03-19 |
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