CN210622871U - Seal clearance adjustable gentle and agreeable paper tinsel honeycomb seal structure - Google Patents
Seal clearance adjustable gentle and agreeable paper tinsel honeycomb seal structure Download PDFInfo
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- CN210622871U CN210622871U CN201921499725.4U CN201921499725U CN210622871U CN 210622871 U CN210622871 U CN 210622871U CN 201921499725 U CN201921499725 U CN 201921499725U CN 210622871 U CN210622871 U CN 210622871U
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Abstract
A seal clearance adjustable compliant foil honeycomb seal structure is characterized in that a compliant foil honeycomb seal unit is arranged on the inner wall of a seal cylinder body, the seal cylinder body is provided with an air vent, the inner wall of the seal cylinder body is provided with a plurality of rings formed by circumferentially connecting grooves along the axial direction, the grooves of axially adjacent rings are arranged in a staggered manner, the axially adjacent rings are sealed and isolated by arranging seal rings, and an axial groove is arranged between the circumferentially adjacent grooves; be equipped with gentle and agreeable paper tinsel honeycomb seal unit in the recess, include by inside to outside radial coincide's split type seal block, radial support elasticity wave plate and pressure gasbag, split type seal block's inner wall is equipped with evenly distributed's honeycomb holes, split type seal block both sides are equipped with the seal groove, inlay the sealing strip in the seal groove, pressure gasbag intercommunication external air pressure source, radial support elasticity wave plate has stiff end and free end, the stiff end compresses tightly through soft layering and fixes in the axial ditch inslot, radial support elasticity wave plate's crest and valley compress tightly the laminating with pressure gasbag and split type seal block respectively.
Description
Technical Field
The utility model relates to a turbomachinery sealing technique is applicable to large-scale turbomachinery's such as various gas turbine, steam turbine, compressor axle head sealing device, belongs to cylinder fluid seal technical field.
Background
The honeycomb seal is also called honeycomb hole type damping seal, and belongs to a non-contact cylindrical surface seal. The seal is mainly used for sealing gas media or steam, and is widely applied to interstage seals, shaft end seals and blade top seals in machines such as steam turbines, gas turbines, centrifugal compressors, blowers and the like, or other front seals of dynamic seals. The amount of leakage of the honeycomb seal is proportional to the size of the throttle gap, and therefore, from the viewpoint of sealing performance, it is desirable that the throttle gap be as small as possible. The leakage of the honeycomb seal is increased, the efficiency of the whole unit can be directly influenced, and a large amount of energy is wasted. If the throttling clearance between the seal assembly and the rotating shaft can be controlled in a range as small as possible, not only leakage can be controlled but also the dynamic performance of the unit can be improved for large-scale equipment with longer rotating shafts, such as steam turbines, gas turbines, large centrifugal compressors and the like.
For example, during the start and stop of the rotation, when the machine passes through the critical rotation speed, the vibration of the rotating shaft is increased sharply, so that the honeycomb seal and the rotating shaft are rubbed or even collided, the throttling tooth gap is enlarged, and the sealing effect of the labyrinth seal can be lost even because the honeycomb seal is abraded too much. In addition, the traditional honeycomb seal is made of nickel-based alloy, when the gap is too small, sparks can be generated when the seal main body collides with the rotating shaft, and the safety of a unit, particularly a unit for transporting flammable and explosive toxic media, is influenced. To avoid or reduce the possibility of the above problems, the safety margin of the seal gap has to be enlarged during the design stage of the honeycomb seal; for a large steam turbine, the leakage amount of the unit is increased by 20% and the interstage efficiency is reduced by 1% for each 1mm increase of the sealing clearance, so that energy resources of the equipment in the operation process are greatly wasted, and the large steam turbine cannot be accepted by users actually.
In view of the above problems, researchers have proposed a cylindrical surface sealing concept with adaptive controllable gap, and mainly use springs, electromagnets, etc. as elastic elements to regulate the sealing gap, which can achieve the function of regulating the sealing gap to some extent, but have obvious disadvantages. For example, when a spring is used as an elastic element, not only are a plurality of springs often required to form a spring set to control the gap, but also the deformation of the spring set is often inconsistent along with the extension of the service life, so that the gap between the seal assembly and the rotating shaft is inclined or deflected after being regulated; if an electromagnet is adopted as an elastic element, the working conditions of a plurality of large turbine units, particularly large turbine units and compressor units are often in a high-temperature and high-pressure state, and the electromagnet is easy to lose efficacy at the moment. The combination of a wave plate structure with a small space occupation and a variable pressure air bag as an elastic element has been studied little.
The occupied space of the wave plate structure is small, the radial size of cylindrical surface sealing is greatly reduced, and materials and rigidity of the wave plate can be flexibly adjusted according to actual requirements. As the pressure air bag with extremely high flexibility and self-adaptive capacity, the pressure air bag not only has good compliance, but also can conveniently realize the self-adaptive online regulation and control of the sealing clearance by implementing the feedback regulation of the pressure of the air bag according to the pressure change of a certain inlet or outlet medium of the unit. Therefore, the utility model is a brand new sealing technology with good comprehensive performance, especially excellent sealing performance and anti-collision friction performance.
The invention content is as follows:
an object of the utility model is to provide an effectively reduce turbine unit's leakage quantity, reduce the energy resource consumption of equipment in the operation process, improve the sealed leakproofness of axle head and life's adjustable seal clearance's sealing device.
The utility model discloses a technical scheme realizes:
the utility model provides a compliance foil honeycomb seal structure of seal clearance adjustable, is equipped with end cover 7, its characterized in that including installing sealed barrel 1 at turbine unit's stator part, sealed barrel 1's both sides: the inner wall of the sealing cylinder body 1 is provided with a flexible foil honeycomb sealing unit, the sealing cylinder body 1 is provided with an air vent 14, the inner wall of the sealing cylinder body 1 is provided with a plurality of circumferentially connected rings formed by connecting grooves 13 along the axial direction, the grooves 13 of axially adjacent rings are arranged in a staggered manner, the axially adjacent rings are sealed and isolated by arranging a sealing ring 8, and an axial groove 11 is arranged between the circumferentially adjacent grooves 13;
a flexible foil honeycomb sealing unit is arranged in the groove 13, the flexible foil honeycomb sealing unit comprises a split sealing block 5, a radial support elastic wave plate 4 and a pressure air bag 2 which are radially overlapped from inside to outside, honeycomb holes 53 which are uniformly distributed are arranged on the inner wall of the split sealing block 5 to block gas leaked along a rotating shaft, sealing grooves 51 are arranged on two sides of the split sealing block 5, 52, sealing strips 6 are embedded in the sealing grooves 51 and 52, an air hole interface 21 communicated with an external pipeline is arranged on the pressure air bag 2, the radial supporting elastic wave plate 4 is provided with a fixed end 41 and a free end 42, the fixed end 41 is tightly pressed and fixed in the axial groove 11 through the soft pressing strip 3, a convex peak 43 and a concave valley 44 of the radial supporting elastic wave plate 4 are respectively tightly pressed and attached with the pressure air bag 2 and the split type sealing block 5, and axially adjacent flexible foil honeycomb sealing units are sealed and isolated by a sealing ring 8.
Preferably, the end cover 7 is provided with an annular sealing groove 51 on the inner side and is provided with a sealing gasket 71, the end cover 7 is connected with the sealing cylinder 1 through the through hole 12 by a bolt 72 and is compacted with the sealing gasket 71.
Preferably, 2-4 rings are arranged along the axial direction, and 3-6 compliant foil honeycomb sealing units are arranged along the circumferential direction.
Preferably, the sealing hole type of the inner layer split sealing block is selected from one of the following: hexagonal holes, round holes and triangular holes.
The utility model discloses the direction of the axis that uses to be close to sealed barrel 1 is interior, otherwise is outside. The axial direction of the utility model is the direction of the central axis of the sealing cylinder body 1. The two sides of the present invention refer to the axial ends of the components.
The utility model discloses a theory of operation is:
the utility model provides a sealed clearance adjustable gentle and agreeable paper tinsel honeycomb seal structure, this kind of structure is collection dress formula cylinder seal essentially, can accomplish after the equipment externally, pushes the axle head sealing position along turbo set pivot or axle sleeve, later fix the stator part at turbo machine can. Therefore, a supporting elastic wave plate, a pressure air bag which is connected with an air inlet/steam port or an air exhaust/steam port of the unit and has an air pressure feedback control function and an inner layer split type sealing block with a plurality of honeycomb holes arranged inside are introduced, the supporting elastic wave plate and the pressure air bag can perform self-adaptive control on the radial elastic force of the novel cylindrical surface sealing of the machine under different working conditions under the synergistic effect of the supporting elastic wave plate and the inner layer split type sealing block, and the adjustable sealing gap between the supporting elastic wave plate and the rotating shaft or a shaft sleeve is obtained. Because the regulation and control of the elasticity or the sealing gap can realize high precision, the functions of the elasticity or the sealing gap are similar to the effect generated by elastic deformation of the foil, and the flexibility and the adaptability which can be formed by the pressure air bag along the circumferential direction, the axial direction, the oblique direction and the like can be realized, so the cylindrical surface seal with the flexible foil honeycomb seal structure with the adjustable sealing gap is a cylindrical surface seal, and when the inner layer split type seal blocks are arranged and placed in a partitioning manner along the axial direction and the circumferential direction of the seal cylinder body, the novel cylindrical surface seal can adapt to the extremely working conditions of deflection of a rotating shaft, non-neutralization instantaneous vibration and the like.
When the working condition becomes abominable, when needing to enlarge the seal clearance, the external control mechanism of novel cylinder seal will reduce the air current flow who lets in pressure gasbag, reduces the interior gas pressure of gasbag for the gasbag volume reduces, and the gasbag highly contracts in the direction of perpendicular to axle and reduces. The inner layer split type sealing block is far away from the rotating shaft due to the shrinkage of the air bag, the diameter of the whole sealing ring is enlarged, and the sealing gap is finally enlarged. On the contrary, when the unit steady operation, when correspondingly needing less sealed clearance, novel sealed external control mechanism of cylinder will increase the gas flow who flows in the gasbag, improves gas pressure in the gasbag, and the gasbag inflation for the inlayer split type seals piece is drawn close to the pivot, and sealed clearance consequently reduces. The utility model discloses can have stronger adaptability to the operating mode change according to the change self-adaptation regulation seal clearance of operating mode.
The utility model has the advantages and beneficial effects that:
the utility model discloses has following effect:
(1) this structure can be according to the sealed clearance of change self-adaptation control of operating mode to because the sealed piece of inlayer split type adopts the split type, each inlayer split type sealed piece all can independently actuate controlled and form and the pivot between independent clearance size, consequently can make novel cylinder seal whole to the skew of axis of rotation, not produce the self-adaptability to unusual operating mode such as neutral instantaneous vibration, thereby keep good sealed effect and stability.
(2) The utility model discloses introduce support elasticity wave plate, be connected and take the air pressure gasbag of atmospheric pressure feedback control function and the inside inlayer split type seal block that is equipped with a plurality of honeycomb holes from the unit inlet air/steam vent or exhaust/steam vent, consequently compare with the self-adaptation seal structure of traditional elastic element for the spring and have better developments corresponding ability, shock-resistant vibration ability and longer life etc..
Description of the drawings:
figure 1 is a three-dimensional structural cross-sectional view of the adjustable seal gap compliant foil honeycomb seal of the present invention.
Fig. 2 is a three-dimensional structural sectional view of the sealing cylinder of the present invention.
Fig. 3 is an exploded view of the inner sealing ring composed of inner split seal blocks of the present invention.
Fig. 4 is a schematic structural view of the pressure bladder of the present invention.
Fig. 5 is a schematic structural diagram of the radial support elastic wave plate of the present invention.
Fig. 6 is a schematic structural view of the inner layer split type sealing block of the present invention.
Fig. 7 is a schematic view of the end cap structure of the present invention.
In the above-described FIGS. 1-7: 1-sealing the cylinder; 2-a pressure air bag; 3-soft layering; 4-radial support elastic wave plate; 5-inner layer split type sealing block; 6-sealing strips; 7-end cap; 8-sealing ring; 11-axial grooves; 12-a through hole; 13-a groove; 14-a vent hole; 21-pressure air bag vent interface; 41-radial supporting elastic wave plate fixing end; 42-radially supporting the free end of the elastic wave plate; 43. 44-radial supporting elastic wave plate convex peaks and concave valleys; 51. 52-sealing groove at end side of split sealing block; 71-a sealing gasket; 72-bolt.
The specific implementation mode is as follows:
the implementation of the invention is further detailed with the attached drawings:
see fig. 1-7.
A seal clearance adjustable compliant foil honeycomb seal structure comprises a seal cylinder body 1 arranged at a stator part of a turbine unit, wherein end covers 7 are arranged at two sides of the seal cylinder body 1, a compliant foil honeycomb seal unit is arranged on the inner wall of the seal cylinder body 1, the seal cylinder body 1 is provided with an air vent 14, a plurality of circumferentially connected rings of grooves 13 are axially arranged on the inner wall of the seal cylinder body 1, the grooves 13 of the axially adjacent rings are arranged in a staggered manner, the axially adjacent rings are sealed and isolated by arranging a seal ring 8, and an axial groove 11 is arranged between the circumferentially adjacent grooves 13;
a flexible foil honeycomb sealing unit is arranged in the groove 13, the flexible foil honeycomb sealing unit comprises a split sealing block 5, a radial support elastic wave plate 4 and a pressure air bag 2 which are radially overlapped from inside to outside, honeycomb holes 53 which are uniformly distributed are arranged on the inner wall of the split sealing block 5 to block gas leaked along a rotating shaft, sealing grooves 51 are arranged on two sides of the split sealing block 5, 52, sealing strips 6 are embedded in the sealing grooves 51 and 52, an air hole interface 21 communicated with an external pipeline is arranged on the pressure air bag 2, the radial supporting elastic wave plate 4 is provided with a fixed end 41 and a free end 42, the fixed end 41 is tightly pressed and fixed in the axial groove 11 through the soft pressing strip 3, a convex peak 43 and a concave valley 44 of the radial supporting elastic wave plate 4 are respectively tightly pressed and attached with the pressure air bag 2 and the split type sealing block 5, and axially adjacent flexible foil honeycomb sealing units are sealed and isolated by a sealing ring 8.
The inner side of the end cover 7 is provided with an annular sealing groove 51 and is provided with a sealing gasket 71, the end cover 7 is connected with the sealing cylinder body 1 through the through hole 12 by a bolt 72 and compacts the sealing gasket 71.
3 compliant foil honeycomb sealing units are arranged along the axial direction, and 5 compliant foil honeycomb sealing units are arranged along the circumferential direction.
The sealing hole type of the inner layer split sealing block is selected from one of the following: hexagonal holes, round holes and triangular holes.
The utility model discloses can have stronger adaptability to the operating mode change according to the change self-adaptation regulation seal clearance of operating mode.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments, but rather the scope of the invention is intended to cover all equivalent technical means as would be known to one skilled in the art based on the teachings of the present disclosure.
Claims (4)
1. The utility model provides a compliance foil honeycomb seal structure of seal clearance adjustable, is equipped with end cover (7), its characterized in that including installing sealed barrel (1) at turbine unit's stator part, the both sides of sealed barrel (1): the inner wall of the sealing cylinder body (1) is provided with a flexible foil honeycomb sealing unit, the sealing cylinder body (1) is provided with an air vent (14), the inner wall of the sealing cylinder body (1) is provided with a plurality of rings formed by circumferentially connecting grooves (13) along the axial direction, the grooves (13) of axially adjacent rings are arranged in a staggered manner, the axially adjacent rings are sealed and isolated by arranging sealing rings (8), and axial grooves (11) are arranged between the circumferentially adjacent grooves (13);
the flexible foil honeycomb sealing unit is arranged in the groove (13), the flexible foil honeycomb sealing unit comprises a split type sealing block (5) which is radially overlapped from inside to outside, a radial supporting elastic wave plate (4) and a pressure air bag (2), honeycomb holes (53) which are uniformly distributed are formed in the inner wall of the split type sealing block (5) and have a blocking effect on gas leaked along a rotating shaft, sealing grooves (51) and (52) are formed in two sides of the split type sealing block (5), sealing strips (6) are embedded in the sealing grooves (51) and (52), an air hole interface (21) communicated with an external pipeline is formed in the pressure air bag (2), the radial supporting elastic wave plate (4) is provided with a fixed end (41) and a free end (42), the fixed end (41) is pressed and fixed in an axial groove (11) through a soft pressing strip (3), and a convex peak (43) and a concave peak (44) of the radial supporting elastic wave plate (4) are respectively pressed and attached to the pressure air bag (2) and the split type, axially adjacent compliant foil honeycomb sealing units are sealed and isolated by a sealing ring (8).
2. The adjustable seal gap compliant foil honeycomb seal structure of claim 1 wherein: an annular sealing groove (51) is formed in the inner side of the end cover (7) and a sealing gasket (71) is placed in the annular sealing groove, the end cover (7) penetrates through the through hole (12) through a bolt (72) to be connected with the sealing cylinder body (1) and compacts the sealing gasket (71).
3. The adjustable seal gap compliant foil honeycomb seal structure of claim 1 wherein: the ring is arranged with 2 ~ 4 along the axial, and gentle and agreeable foil honeycomb sealed unit has arranged 3 ~ 6 along circumference.
4. The adjustable seal gap compliant foil honeycomb seal structure of claim 1 wherein: the sealing hole type of the split sealing block is selected from one of the following: hexagonal holes, round holes and triangular holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921499725.4U CN210622871U (en) | 2019-09-10 | 2019-09-10 | Seal clearance adjustable gentle and agreeable paper tinsel honeycomb seal structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921499725.4U CN210622871U (en) | 2019-09-10 | 2019-09-10 | Seal clearance adjustable gentle and agreeable paper tinsel honeycomb seal structure |
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| CN210622871U true CN210622871U (en) | 2020-05-26 |
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| CN201921499725.4U Active CN210622871U (en) | 2019-09-10 | 2019-09-10 | Seal clearance adjustable gentle and agreeable paper tinsel honeycomb seal structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110469370A (en) * | 2019-09-10 | 2019-11-19 | 浙江工业大学 | A kind of adjustable submissive foil honeycomb seal structure of seal clearance |
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2019
- 2019-09-10 CN CN201921499725.4U patent/CN210622871U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110469370A (en) * | 2019-09-10 | 2019-11-19 | 浙江工业大学 | A kind of adjustable submissive foil honeycomb seal structure of seal clearance |
| CN110469370B (en) * | 2019-09-10 | 2024-04-09 | 浙江工业大学 | Compliant foil honeycomb sealing structure with adjustable sealing gap |
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