CN218543171U - Bag type damping seal - Google Patents
Bag type damping seal Download PDFInfo
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- CN218543171U CN218543171U CN202222721395.7U CN202222721395U CN218543171U CN 218543171 U CN218543171 U CN 218543171U CN 202222721395 U CN202222721395 U CN 202222721395U CN 218543171 U CN218543171 U CN 218543171U
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- seal
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- type damping
- damping
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Abstract
A bag-shaped damping seal comprises a seal body, wherein a plurality of seal teeth are longitudinally arranged in an inner hole of the seal body, and a plurality of bag-shaped chambers are formed between every two adjacent seal teeth through partition plates; the method is characterized in that: the partitions of the front and rear adjacent bag-shaped chambers are staggered (i.e., not in a straight line). This bag type damping is sealed on the basis that keeps original bag type damping to seal advantages such as processing cost is low, be difficult for producing the excitation, changes the baffle of adjacent bag type cavity to stagger each other by being in a straight line around the bag type damping is sealed to block the passageway that produces ventilative effect, compare with original bag type damping, can obviously reduce gaseous leakage volume, effectively improve the leakproofness.
Description
Technical Field
The utility model relates to a sealed technical field, especially a bag type damping is sealed.
Background
The labyrinth seal is formed by arranging a plurality of annular seal teeth which are sequentially arranged around a rotating shaft. Because the labyrinth seal has a gap between the rotor and the casing, no solid contact, no lubrication and thermal expansion allowance, the labyrinth seal is suitable for occasions with high temperature, high pressure and high rotating frequency, and is widely used for shaft end and interstage sealing of steam turbines, gas turbines, compressors and blowers or front sealing of other dynamic seals. However, the seal is prone to shock excitation, resulting in unstable rotor motion. In the early 90 s of the last century, the honeycomb seal is firstly used on a liquid fuel worm gear pump of a space shuttle in the American aerospace field, and a good effect of eliminating the sub-asynchronous vibration is achieved. Thereafter, the honeycomb seal gradually replaces a comb labyrinth gland seal, and is successfully applied to the fields of steam turbines, gas compressors, aircraft engines and the like. The honeycomb seal has the characteristics of good sealing effect, long service life, capability of reducing sub-asynchronous vibration, capability of dehumidifying and the like, and is one of the advanced sealing technologies in the world. However, the honeycomb seal has complex honeycomb chamber structure, high processing difficulty and long processing time, so that the processing cost is always high and the product cost is high. In order to reduce the manufacturing cost, the bag-type damping seal is invented abroad to replace the honeycomb seal. The bag type damping seal is based on the traditional labyrinth seal structure, and a plurality of partition plates are arranged on the stator surface along the circumferential direction so as to reduce the circumferential flow of fluid, increase the damping of a rotor system of the turbo machinery at a sealing part and strengthen the stability of the rotor system. The bag-type damping seal can reduce the excitation as the honeycomb seal, but the manufacturing cost is lower than that of the honeycomb seal because the processing difficulty is greatly reduced.
The prior bag-type damping seal has an obvious defect that the partition plates of the front bag-type chamber and the rear bag-type chamber are mutually connected into a straight line (namely, the front bag-type chamber and the rear bag-type chamber are separated by the same partition plate), so that part of high-pressure gas is easy to flow out of the seal along a channel formed by the seal body and the whole partition plate instead of entering the bag-type chamber for expansion and pressure reduction, and the phenomenon is called 'ventilation effect'. This venting effect increases the amount of gas leakage from the bag-type damping seal and reduces the sealing performance.
SUMMERY OF THE UTILITY MODEL
For overcoming this shortcoming of current bag type damping seal, the utility model provides a bag type damping seal that gas leakage quantity is littleer, sealing performance is better.
The utility model provides a bag type damping seal, which comprises a seal body, wherein a plurality of seal teeth are longitudinally arranged in an inner hole of the seal body, and a plurality of bag-shaped cavities are formed between adjacent seal teeth through partition plates; the bag-shaped chamber is characterized in that the partition plates of the front and rear adjacent bag-shaped chambers are staggered (namely not on the same straight line).
The utility model discloses bag type damping is sealed on keeping the basis of advantages such as original bag type damping seal processing cost low, difficult production excitation, changes the baffle of adjacent bag type cavity into staggeredly on being in a straight line around the bag type damping is sealed, not on a straight line promptly to block the passageway that produces ventilative effect, make high-pressure gas can get into bag type cavity smoothly step by step and expand the decompression, the atmosphere of discharging into at last. Compare with original bag type damping seal, the utility model discloses bag type damping seal can obviously reduce gaseous leakage quantity, effectively improves sealing performance.
Drawings
FIG. 1 is a three-dimensional perspective view of the bag-type damping seal of the present invention;
fig. 2 is an axial sectional view taken along fig. 1.
The symbols in the drawings illustrate that: 1. sealing body, 2, partition board, 3, bag-shaped cavity, 4 and sealing teeth.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1 and 2, the bag-type damping seal of the present invention comprises a seal body 1, a plurality of seal teeth 4 are longitudinally arranged in an inner hole of the seal body, and a plurality of bag-shaped chambers 3 are divided between adjacent seal teeth by partition plates 2; the partitions of the front and rear adjacent bag-shaped chambers are staggered with each other, i.e., not in a straight line.
Claims (1)
1. A bag-shaped damping seal comprises a seal body (1), wherein a plurality of seal teeth (4) are longitudinally arranged in an inner hole of the seal body, and adjacent seal teeth are divided into a plurality of bag-shaped chambers (3) through partition plates (2); the method is characterized in that: the partition plates of the front and rear adjacent bag-shaped chambers are staggered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222721395.7U CN218543171U (en) | 2022-10-17 | 2022-10-17 | Bag type damping seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222721395.7U CN218543171U (en) | 2022-10-17 | 2022-10-17 | Bag type damping seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218543171U true CN218543171U (en) | 2023-02-28 |
Family
ID=85280546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222721395.7U Active CN218543171U (en) | 2022-10-17 | 2022-10-17 | Bag type damping seal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218543171U (en) |
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2022
- 2022-10-17 CN CN202222721395.7U patent/CN218543171U/en active Active
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