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CN200985803Y - Active blade integral enclosing belt radial packing teeth used for steam turbine high pressure through flow - Google Patents

Active blade integral enclosing belt radial packing teeth used for steam turbine high pressure through flow Download PDF

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Publication number
CN200985803Y
CN200985803Y CN 200620049621 CN200620049621U CN200985803Y CN 200985803 Y CN200985803 Y CN 200985803Y CN 200620049621 CN200620049621 CN 200620049621 CN 200620049621 U CN200620049621 U CN 200620049621U CN 200985803 Y CN200985803 Y CN 200985803Y
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CN
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Grant
Patent type
Prior art keywords
vapor
lock
tooth
high
flow
Prior art date
Application number
CN 200620049621
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Chinese (zh)
Inventor
张红梅
顾玫玫
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上海汽轮机有限公司
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Abstract

The utility model relates to a steam turbine high pressure through flow radial direction vapor lock structure, which is a movable vane whole shroud radial direction vapor lock tooth and is characterized in that the top of the movable vane shroud is provided with a vapor lock tooth forms a comb teeth maze type vapor lock with the vapor lock tooth of the vapor lock ring embedded in the inner cylinder. Compared with the original flat tooth vapor lock structure, the utility model has larger coefficient of resistance; while compared with the original step type high and low tooth vapor lock, the utility model can add more teeth, thereby reducing the leaking loss caused by the high pressure through flow vapor lock, enhancing sealing effect and improving the through flow efficiency.

Description

用于汽轮机高压通流的动叶整体围带径向汽封齿 Bucket for a steam turbine high pressure flow passage integral shroud radially steam seal tooth

(一)技术领域本实用新型涉及汽轮机高压通流径向汽封结构。 (A) Technical Field The present relates to a novel seal structure Steam Turbine flow radially practical.

(二)背景技术影响汽轮机机组通流效率的主要影响因素有型面损失、余速损失、泄漏损失等,其中泄漏损失主要由泄漏的漏汽量所决定,通流间的转子和静子间隙和泄漏通道结构等因素可以影响机组的泄漏量。 The main factors (b) Background on Unit flow turbine efficiency are profile loss than the speed loss, leakage losses, which leakage loss is mainly determined by the amount of steam leakage leakage, the rotor between the flow and the stator gap and leakage channel structure and other factors can affect the amount of leakage unit. 现有的汽轮机高压通流径向汽封结构大多采用如图1所示的平齿结构,即在高压自带围带动叶片的围带叶顶处一端为平面,在内缸对应位置处布置高低齿,该结构可不用考虑机组的动静热膨胀的胀差,可以布置较多的齿数,但是单齿密封效率比较低。 Existing high pressure turbine steam seal flow radially flat teeth structure it uses the configuration shown in FIG. 1, i.e. at the high pressure driven around comes around the tip of the blade with a flat end, is disposed at a position corresponding to the level of the inner cylinder teeth, the structure may not consider the thermal expansion difference between the movement of the expansion unit can be arranged more teeth, but monodentate sealing efficiency is relatively low. 还有一种为台阶式高低齿汽封结构,参见图2,即在高压自带围带动叶片的围带叶顶处加工出台阶,在内缸对应位置处布置高低齿,通过在汽封流道内的耗散作用,降低压力,减少泄漏。 There machined step one for the high and low gear steam seal stepped structure, see FIG. 2, i.e., the high-pressure driven around comes around the tip of the blade strip, the inner cylinder at a position corresponding to high and low gear arrangement, the steam seal flow through passage dissipation effect, reducing pressure to reduce leakage. 这种结构由于台阶和高低齿的配合,对轴向间隙的要求比较高,其优点是单齿密封效率比较高,缺点是在同样的轴向长度内,布的齿数比较少。 Because of this structure and with the step height of the teeth, the requirements for relatively high axial gap, the advantage of a relatively high sealing efficiency monodentate disadvantage is in the same axial length, the number of teeth less cloth.

(三)发明内容本实用新型的目的在于提供一种用于汽轮机高压通流的动叶整体围带径向汽封齿,该围带径向汽封齿可增加汽封齿数,在叶顶构成梳齿迷宫式汽封,能有效防止高压部分漏汽损失。 (C) of the present invention aims to provide a bucket for a steam turbine high pressure flow passage integral shroud radially steam seal tooth, the seal tooth shroud radially steam vapor seal teeth can be increased, constituting the tip comb-tooth labyrinth seal steam, high pressure portion can effectively prevent the steam leakage loss.

本实用新型是这样实现的:一种用于汽轮机高压通流的动叶整体围带径向汽封齿,其特征是:动叶围带顶部上加工有汽封齿,所述汽封齿与镶嵌于内缸的汽封环上的汽封齿构成梳齿迷宫式汽封。 The present invention is achieved: one bucket for a steam turbine high pressure flow passage integral shroud radially steam seal teeth, wherein: bucket with a shroud on top of the working steam seal tooth, the tooth and the steam seal teeth on the steam seal gland rings embedded in the cylinder constituting the comb-tooth labyrinth seal steam.

本实用新型是在动叶围带叶顶上直接加工出汽封齿,与镶嵌于内缸的汽封环上的汽封齿构成梳齿迷宫式汽封,围带叶顶上的汽封齿比台阶式的高度高,齿数也可增加,使流过齿隙的蒸汽动能在下一汽室中较好的转化压力能,实际运行中每个汽封齿始终可以起到封汽的作用,从而达到减少蒸汽泄漏量,提高通流效率的目的。 The present invention is a steam seal tooth top of the bucket shroud leaf directly machined steam seal teeth, and the teeth on the steam seal embedded in the cylinder constituting the comb-shaped gland rings a labyrinth seal steam, leaves the top of the shroud higher than the step-height teeth also increase, so that steam flowing through the backlash better kinetic conversion lower pressure chamber can FAW, the actual operation of each tooth always steam seal may function as sealing steam, to achieve reducing the amount of steam leakage, the purpose of improving flow efficiency.

本实用新型相对于现有的台阶式高低齿汽封,由于齿数增加可减少漏汽量;相对于现有的平齿汽封,由于汽封齿在叶顶构成梳齿迷宫式汽封,增加了蒸汽的流动阻力,减少了高压部分漏汽量,增强密封效果,提高通流效率。 The present invention with respect to conventional steam seal stepped tooth height, because the number of teeth to increase the amount of steam leakage can be reduced; flat teeth with respect to conventional steam seal, since the comb teeth constituting the teeth of the labyrinth seal steam steam seals tip, increasing steam flow resistance, reduces the amount of steam leakage high pressure portion, to enhance the sealing effect, improving flow efficiency.

(四)附图说明下面结合附图和具体实施方式对本实用新型作进一步说明。 (Iv) Brief Description The present invention is further described in conjunction with the accompanying drawings and for the following specific embodiments.

图1为平齿汽封结构示意图;图2为台阶式高低齿汽封结构示意图;图3为本实用新型梳齿迷宫式汽封结构示意图。 1 is a schematic structure of the flat teeth vapor seal; FIG low vapor seal teeth of the stepped structure diagram; steam labyrinth seal schematic structure of a new comb-3 present invention.

图中:1动叶(转子),2汽封环,3塞紧条,4汽封齿,5静子(内缸),6围带。 FIG: a rotating blade (rotor), gland rings 2, 3 of plugged, steam seal tooth 4, the stator 5 (the cylinder), the shroud 6.

(五)具体实施方式参见图3,一种用于汽轮机高压通流的动叶整体围带径向汽封齿,是在动叶1围带6顶部上加工有汽封齿4,所述汽封齿4与镶嵌于内缸5的汽封环2上的汽封齿构成梳齿迷宫式汽封。 (E) DETAILED DESCRIPTION Referring to Figure 3, a high pressure flow of buckets for a steam turbine steam seal integral shroud radial teeth, in a bucket shroud 6 on the top machined with steam seal teeth 4, the steam steam seal teeth on the two teeth 4 and 5 embedded in the cylinder constituting the comb-shaped gland rings steam labyrinth seal. 汽封环2上的汽封齿4可采用加工或采用镶齿结构。 2 steam seal teeth on the seal ring 4 can be steam engineer or insert structure. 汽封齿4径向留有余量,装配后按要求加工配准对齿汽封的间隙即可。 Radial steam seal teeth 4 left margin, the assembly process required for registration to the steam seal tooth gap.

本实用新型相对原有平齿汽封结构,阻力系数更大;而相对于原有的台阶式高低齿汽封,可增加更多齿数,较大限度的降低高压通流汽封的漏汽损失,增强密封效果,提高通流效率。 The present invention relative to the original level steam seal tooth structure, greater resistance coefficient; relative to the original height of the stepped teeth steam seal, add more teeth, large steam leakage loss reduction limits the flow through the high pressure steam seal , to enhance the sealing effect, improving flow efficiency.

Claims (1)

1.一种用于汽轮机高压通流的动叶整体围带径向汽封齿,其特征是:动叶围带顶部上加工有汽封齿,所述汽封齿与镶嵌于内缸的汽封环上的汽封齿构成梳齿迷宫式汽封。 A bucket for a steam turbine high pressure flow passage integral shroud radially steam seal teeth, wherein: bucket with a shroud on top of the working steam seal tooth, the seal tooth and the steam cylinder embedded in the steam steam seal tooth comb teeth constituting the seal ring on the steam labyrinth seal.
CN 200620049621 2006-12-27 2006-12-27 Active blade integral enclosing belt radial packing teeth used for steam turbine high pressure through flow CN200985803Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200620049621 CN200985803Y (en) 2006-12-27 2006-12-27 Active blade integral enclosing belt radial packing teeth used for steam turbine high pressure through flow

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CN 200620049621 CN200985803Y (en) 2006-12-27 2006-12-27 Active blade integral enclosing belt radial packing teeth used for steam turbine high pressure through flow

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102335672A (en) * 2011-09-29 2012-02-01 湖南现代威保特环保科技有限公司 Harmless dehydrator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102335672A (en) * 2011-09-29 2012-02-01 湖南现代威保特环保科技有限公司 Harmless dehydrator
CN102335672B (en) 2011-09-29 2013-11-06 湖南现代环境科技有限公司 Harmless dehydrator

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C14 Grant of patent or utility model
C41 Transfer of patent application or patent right or utility model
ASS Succession or assignment of patent right

Owner name: SHANGHAI ELECTRIC POWER STATION EQUIPMENT CO.

Free format text: FORMER OWNER: SHANGHAI TURBINE CO., LTD.

Effective date: 20080509

EXPY Termination of patent right or utility model