CN212406814U - Novel micro-gap steam seal based on adjustable Brayton structure - Google Patents
Novel micro-gap steam seal based on adjustable Brayton structure Download PDFInfo
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- CN212406814U CN212406814U CN202021670335.1U CN202021670335U CN212406814U CN 212406814 U CN212406814 U CN 212406814U CN 202021670335 U CN202021670335 U CN 202021670335U CN 212406814 U CN212406814 U CN 212406814U
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Abstract
The utility model discloses a novel microgap steam seal based on a Brayton adjustable structure, belonging to the technical field of steam turbine sealing elements; the steam seal comprises eight sections of steam seal arc blocks and micro-gap steam seal teeth; the end parts of the steam seal arc blocks are respectively provided with a spring, a steam inlet channel is processed at the steam inlet side of the steam seal arc blocks, and the micro-gap steam seal teeth are made of 0Cr15Mo (or a material which is superior to 0Cr15 Mo) material; the micro-gap steam seal teeth comprise high teeth and low teeth, and the low teeth are of oblique side tooth structures; the utility model discloses thereby effectively solved and bumped the damage that rubs and lead to rotor shaft, shroud ring, load pressure differential and cross low unable scheduling problem of closing at the in-process of using the adjustable vapor seal of blandon easy to take place.
Description
Technical Field
The utility model relates to a steam turbine sealing member technical field, concretely relates to novel microgap vapor seal based on adjustable structure of burlyden.
Background
The steam seal is a device which is arranged between the dynamic part and the static part of the steam turbine and reduces or prevents the leakage of steam and the leakage of air at the vacuum side; with the development of steam turbine technology, the requirements for steam sealing are gradually increased; after the adjustable blandon vapor seal is introduced into China, the adjustable blandon vapor seal is popularized and applied to important occasions such as various generator sets and the like due to good safety, economy and durability; however, due to the technical defects of the spring on the Brayton structure steam seal, at the initial load stage faced by the starting process of the unit, the steam seal is in a full-open position under the action of the spring, the gap is at the maximum value at the moment, the steam leakage amount of the steam seal is maximum, the rotor is heated quickly, the cylinder cannot be heated, the shaft string is easy to appear, and the radial rubbing is easy to occur; meanwhile, in the normal starting and stopping process, the damage of a rotor shaft and a shroud band caused by dynamic and static collision and friction is easily caused as other conventional steam seals are the same; this is a major problem currently faced when using gland seals.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the utility model provides a novel microgap vapor seal based on adjustable structure of blandon to thereby it rubs easily to take place to bump the damage that leads to rotor shaft, shroud ring, load differential pressure hang down unable closed scheduling problem at present in the in-process that uses adjustable vapor seal of blandon.
In order to solve the above problem, the utility model provides a following technical scheme:
a novel microgap steam seal based on a Brayton adjustable structure comprises eight sections of steam seal arc blocks and microgap steam seal teeth; the end parts of the steam seal arc blocks are respectively provided with a spring, a steam inlet channel is processed at the steam inlet side of the steam seal arc blocks, and the micro-gap steam seal teeth are made of 0Cr15Mo material; the microgap gland sealing teeth comprise high teeth and low teeth, and the low teeth are in a skewed side tooth structure.
Preferably, the steam seal arc block and the micro-gap steam seal tooth are of an integral steam seal structure which is formed by integrally forming the same 0Cr15Mo material.
Preferably, the steam inlet channel is obtained by milling.
Preferably, the microgap gland teeth are surface treated.
Preferably, the low teeth have a tooth inclination angle of15°～25°
Preferably, the material of the spring is the same as that of the high-medium pressure Braille adjustable steam seal spring, and on different steam seals, the parameters of the spring are related according to the pressure and the weight of the steam seal and the parameters of the actual operation of the steam seal.
The utility model discloses beneficial effect:
the utility model discloses structure to conventional burdeng vapor seal improves, and the advantage of product after the improvement embodies in following several aspects:
1. as an improved structure of the Brayton adjustable steam seal, the device of the utility model also inherits the advantages of the Brayton steam seal, namely, the steam seal body can be automatically opened and closed in the starting and stopping process of the unit through the spring, and simultaneously, the radial clearance between the steam seal and the rotor is always kept in a smaller range in the normal operation of the unit, namely, the lower limit of a design value is met;
2. in the concrete improvement measure, the material of the microgap steam seal tooth is changed into ferrite material of 0Cr15Mo (the performance of the ferrite material is equal to or better than that of 0Cr15Mo, and other materials with the performance of 0Cr15Mo are also available), and because the ferrite material has the advantage of difficult hardening, the direct contact friction between the steam seal tooth and a rotor shaft and a shroud band can be allowed, and the lower hardness value when leaving the factory is kept, thereby protecting the rotor, reducing the friction time, reducing the probability of rotor vibration or deformation, further improving the operation safety of a machine set, and preventing the hardened steam seal tooth from damaging the rotor and the shroud band
3. Based on the use of the Braiden spring and the improvement of the steam seal tooth material, the use clearance of the steam seal is reduced from 0.35-0.5mm of the conventional Braiden steam seal to the specification of 0.15 +/-0.05 mm, the steam seal clearance is an important index of the production efficiency of the reaction unit, according to the experience, the steam seal clearance of each level of partition plate of the high-pressure part of the unit is increased by 0.1mm, the level efficiency is reduced by 0.4-0.6%, so that the smaller steam seal clearance provides better sealing performance, the rotation speed of a steam turbine rotor is improved, and the economic benefit of the steam turbine unit is greatly improved;
4. in the improvement measure, low teeth on the original comb-tooth type steam seal are changed into an oblique side tooth form, and the flow resistance of the steam seal in the working process is increased and the steam leakage is reduced by redesigning the tooth space and the tooth inclination angle; the sealing performance of the steam seal is improved;
5. the utility model discloses still further improve conventional assembled gland sealing tooth and gland sealing body into integral gland sealing structure, through this improvement, the peak stress of effectual reduction gland sealing tooth, eliminated and caused high all fatigue stress, improved the natural frequency of gland sealing tooth to the tooth rupture phenomenon that probably appears in the gland sealing operation process has been reduced, has realized long-term, the reliable operation of gland sealing;
6. the Braiden steam seal before improvement can not realize the complete closure of the steam seal when the unit load does not reach 100%, and after improvement, due to the optimization of the steam seal structure and the closure sequence, all the steam seals can be ensured to be completely closed even when the unit load is only 25-30%, so that the use problem of the Braiden steam seal in the low-load operation state of the steam turbine at present is well solved;
7. the utility model discloses do not have the requirement of special processing to gland casing and baffle groove, its improvement based on the blandon gland, nevertheless with regard to manufacturing cost, its price is compared with the domestic blandon gland of introduction and is had certain advantage.
Drawings
Fig. 1 is a schematic structural view of the utility model in the present embodiment;
description of reference numerals: 1. the steam seal device comprises a steam seal arc block, 2 parts of micro-gap steam seal teeth, 2 parts of high teeth, 2 parts of low teeth, 3 parts of springs, 4 parts of air inlet channels.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments:
example (b):
referring to fig. 1, the present embodiment provides a novel microgap steam seal based on a brayton adjustable structure, which includes eight sections of steam seal arc blocks 1 and microgap steam seal teeth 2; the end parts of the steam seal arc blocks 1 are respectively provided with a spring 3, the steam inlet side of each steam seal arc block 1 is provided with a steam inlet channel 4, and the micro-gap steam seal teeth 2 are made of 0Cr15Mo or a material with parameters superior to 0Cr15 Mo; the micro-gap steam seal teeth 2 comprise high teeth 2A and low teeth 2B, and the low teeth 2B are of oblique side tooth structures.
The steam seal arc block 1 and the micro-gap steam seal tooth 2 are of an integral steam seal structure which is made of the same 0Cr15Mo material by adopting an integrally-formed processing means.
The steam inlet channel 4 is obtained by milling.
The micro-gap steam seal tooth 2 is processed by adopting a special processing technology.
The angle of inclination between two low teeth on each set of low teeth 2B is 20 °.
The material of the spring 3 is the same as that of the high-medium pressure Braille adjustable steam seal spring, and on different steam seals, the parameters of the spring 3 are related to the pressure and the weight of the steam seal and the actual operation parameters of the steam seal.
In this embodiment, the parameters of the Brayton microgap steam seal designed for a steam CLN600-24.2/566/566 plant of a certain plant can be referred to in Table 1:
TABLE 1
All units are mm
From the above table, the modified braider microgap steam seal optimizes the closing sequence of the steam seal under the condition of gradually increasing load, so that the corresponding braider steam seal structure of the steam turbine can be closed under the low load state of less than 25%.
Claims (6)
1. A novel microgap steam seal based on a Brayton adjustable structure comprises eight sections of steam seal arc blocks (1) and microgap steam seal teeth (2); the method is characterized in that: the end parts of the steam seal arc blocks (1) are respectively provided with a spring (3), a steam inlet channel (4) is processed at the steam inlet side of the steam seal arc blocks (1), and the micro-gap steam seal teeth (2) are made of 0Cr15Mo material; the micro-gap steam seal tooth (2) comprises a high tooth (2A) and a low tooth (2B), and the low tooth (2B) is of an oblique side tooth structure.
2. The novel microgap steam seal based on the adjustable brayton structure of claim 1, characterized in that: the steam seal arc block (1) and the micro-gap steam seal tooth (2) are of an integral steam seal structure which is formed by integrally forming the same 0Cr15Mo material by using a processing method.
3. The novel microgap steam seal based on the adjustable brayton structure of claim 1, characterized in that: the steam inlet channel (4) is obtained by milling.
4. The novel microgap steam seal based on the adjustable brayton structure of claim 1, characterized in that: the micro-gap gland sealing teeth (2) are subjected to surface treatment.
5. The novel microgap steam seal based on the adjustable brayton structure of claim 1, characterized in that: the inclination angle between two low teeth on each group of low teeth (2B) is 15°~25°。
6. The novel microgap steam seal based on the adjustable brayton structure of claim 1, characterized in that: the material of the spring (3) is the same as that of the high-medium pressure Braille adjustable steam seal spring, and on different steam seals, the parameters of the spring (3) are related according to the pressure and the weight of the steam seal and the parameters of the actual operation of the steam seal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021670335.1U CN212406814U (en) | 2020-08-12 | 2020-08-12 | Novel micro-gap steam seal based on adjustable Brayton structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021670335.1U CN212406814U (en) | 2020-08-12 | 2020-08-12 | Novel micro-gap steam seal based on adjustable Brayton structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111779545A (en) * | 2020-08-12 | 2020-10-16 | 贵州德睿龙电力技术有限责任公司 | Novel micro-gap steam seal based on adjustable Brayton structure |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111779545A (en) * | 2020-08-12 | 2020-10-16 | 贵州德睿龙电力技术有限责任公司 | Novel micro-gap steam seal based on adjustable Brayton structure |
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