CN202250269U - Low-pressure communicating pipe structure in steam turbine - Google Patents
Low-pressure communicating pipe structure in steam turbine Download PDFInfo
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- CN202250269U CN202250269U CN2011203229391U CN201120322939U CN202250269U CN 202250269 U CN202250269 U CN 202250269U CN 2011203229391 U CN2011203229391 U CN 2011203229391U CN 201120322939 U CN201120322939 U CN 201120322939U CN 202250269 U CN202250269 U CN 202250269U
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Abstract
The utility model discloses a medium and low pressure communicating pipe structure used in the field of steam turbines, which comprises a medium pressure steam exhaust three-way bent pipe, a first low pressure steam inlet pipe, a second low pressure steam inlet pipe and a low pressure straight communicating pipe; two symmetrically arranged straight pipes on the medium-pressure steam exhaust three-way bent pipe are connected with two medium-pressure steam exhaust ports on the medium-pressure cylinder, and the middle bent pipe of the medium-pressure steam exhaust three-way bent pipe is connected with the rear end of the low-pressure straight section communicating pipe; the first low-pressure steam inlet pipe is vertically connected with the low-pressure straight section communicating pipe and a low-pressure steam inlet on the first low-pressure cylinder, and the second low-pressure steam inlet pipe is vertically connected with the low-pressure straight section communicating pipe and a low-pressure steam inlet on the second low-pressure cylinder. The utility model discloses the steam loss of reducible intercommunication tubular structure itself improves the homogeneity of low pressure admission speed to improve the complete machine efficiency of steam turbine.
Description
Technical field
The utility model relates to a kind of mesolow connecting tube structure that is used for the steam turbine field.
Background technique
Steam turbine mesolow connecting tube structure is middle pressure steam ports and the pipeline of the low pressure admission mouth on the low pressure (LP) cylinder that connects in the steam turbine on the intermediate pressure cylinder; The steam-operating performance of its structural type not only is related to the vapour losses of connecting tube structure itself, and also the efficient to the low pressure (LP) cylinder part produces material impact.The structural type of the intermediate pressure cylinder of level steam turbines such as the present domestic overwhelming majority's overcritical 600MW is the high pressure cylinder combined structure, and middle pressure displacement is big, so the middle pressure steam ports of two lateral symmetry need be set; Traditional design method is exactly that two middle pressure steam ports just design two mesolow connecting tube, pressure vapour and low pressure admission in carrying out respectively.Traditional mesolow connecting tube, overall structure was shown in Fig. 1 a to Fig. 1 c.The direction of black line arrow is the direction of flow of steam in the connecting tube structure among the figure.The middle pressure vapour of senior middle school's pressing cylinder 40 is respectively through behind the pressure steam pipe 31 in pressure steam pipe 21 in No. one and No. two; Get into a low pressure straight section connecting tube 20 and No. two low pressure straight section connecting tube 30 more respectively; And then, finally get into first low pressure (LP) cylinder 41 and second low pressure (LP) cylinder 42 respectively respectively through behind low pressure admission pipe 22 and No. two low pressure admission pipes 32.The axial distance of No. two low pressure straight section connecting tube 30 is longer, so also need the layout connecting tube support 33 at first low pressure (LP) cylinder, 41 places.Crucial is because employing is carried out steam discharge and admission respectively at two mesolow connecting tube; So on the vertical cross-section of the low pressure admission mouth that all can not be arranged in low pressure (LP) cylinder low pressure straight section connecting tube of two mesolow connecting tube; So a low pressure admission pipe 22 and No. two low pressure admission pipes 32 must use the knuckle bend pipe; Can cause thus steam at the low pressure admission mouth place of low pressure (LP) cylinder velocity distribution inhomogeneous and large-scale eddy flow occurring near low pressure admission pipe side, not only connecting tube structure itself vapour losses increase; And cause the low pressure admission Kou Chu cross section velocity distribution of low pressure (LP) cylinder inhomogeneous, have influence in the low pressure (LP) cylinder first order even follow-up some levels have the stage efficiency of leaf passage, thereby influence the overall efficiency of steam turbine.
The model utility content
The purpose of the utility model is in order to overcome the deficiency of existing technology, a kind of steam turbine mesolow connecting tube structure to be provided, and it not only can save material; And on can the vertical cross-section with the low pressure admission mouth that is arranged on two low pressure (LP) cylinders low pressure straight section connecting tube, this helps to reduce vapour losses, improves turbine efficiency.
A kind of technological scheme that realizes above-mentioned purpose is: a kind of steam turbine mesolow connecting tube structure comprises the first low pressure admission pipe, the second low pressure admission pipe, low pressure straight section connecting tube and middle pressure vapour threeway bend pipe;
Wherein middle pressure vapour threeway bend pipe comprises two symmetrically arranged straight tubes and a middle bend pipe; Said two symmetrically arranged straight tubes are connected with two middle pressure steam ports of intermediate pressure cylinder, and the middle bend pipe and the rear end of said low pressure straight section connecting tube of said middle pressure vapour threeway bend pipe are connected; The vertical low pressure admission mouth that connects on the said low pressure straight section connecting tube and first low pressure (LP) cylinder of the said first low pressure admission pipe, the vertical low pressure admission mouth that connects on the said low pressure straight section connecting tube and second low pressure (LP) cylinder of the said second low pressure admission pipe.
Further; The first low pressure straight section connecting tube and the second low pressure straight section connecting tube that is positioned at the top of said second low pressure (LP) cylinder that are divided into the top that is positioned at said first low pressure (LP) cylinder said low pressure straight section connecting tube; The section area of the said second low pressure straight section connecting tube is the half the of the said first low pressure straight section connecting tube section area, between the said first low pressure straight section connecting tube and the second low pressure straight section connecting tube intermediate connecting part is set.
The section area of the said second low pressure admission pipe is the half the of the said first low pressure admission tube section area.
Further again, said intermediate connecting part is a flange, and the pipeline section that the said first low pressure straight section connecting tube goes up between the first low pressure admission pipe and said flange is set to the tapering transition section.
Further, on said connecting tube structure compound hinge type expansion joint, compound pull rod type expansion joint and bend pipe pressure balance type expansion joint are set respectively;
Said compound hinge type expansion joint is arranged on two symmetrically arranged straight tubes of said pressure vapour threeway bend pipe;
Said compound pull rod type expansion joint is in said on the first low pressure straight section connecting tube between pressure vapour threeway bend pipe and the said first low pressure admission pipe;
Said bend pipe pressure balance type expansion joint was positioned on second low pressure straight section connecting tube of rear and front end of the said second low pressure admission pipe.
Adopted the utility model a kind of mesolow connecting tube structure technological scheme, can save material, need not extra connecting tube supporting bracket; Be the more important thing is, owing to have only a low pressure straight section connecting tube, so the first low pressure admission pipe and the second low pressure admission pipe can be arranged on the vertical cross-section of low pressure admission mouth of two low pressure (LP) cylinders.The harmful effect that the low pressure admission mouth that can avoid adopting knuckle admission bend pipe to connect low pressure straight section connecting tube and low pressure (LP) cylinder like this causes; Velocity distribution is evenly and also do not have large-scale eddy flow near low pressure admission pipe side at the low pressure admission mouth place of low pressure (LP) cylinder for steam.Adopt the utility model not only can reduce the vapour losses of connecting tube itself, and can improve the uniformity of low pressure admission speed, thereby the first order and the follow-up some levels that improve low pressure (LP) cylinder there are the stage efficiency of leaf passage, thereby further improve the overall efficiency of steam turbine.
Description of drawings
Fig. 1 a is the steam turbine mesolow connecting tube structural front view of existing technology;
Fig. 1 b is the steam turbine mesolow connecting tube structure plan view of existing technology;
Fig. 1 c is that the steam turbine mesolow connecting tube structure A of existing technology is to view.
Fig. 2 a is the partial front elevation view of the utility model steam turbine mesolow connecting tube structure;
Fig. 2 b is the partial top view of the utility model steam turbine mesolow connecting tube structure;
Fig. 2 c is that the utility model steam turbine mesolow connecting tube structure B is to view.
Embodiment
See also Fig. 2 a to Fig. 2 c, the utility model in order to understand the technological scheme of the utility model better, below through embodiment particularly, and combine accompanying drawing at length to explain:
For simplicity, do not draw among Fig. 2 first low pressure (LP) cylinder and second low pressure (LP) cylinder.The direction of black line arrow is the direction that steam flow flows among the figure.
See also Fig. 2 a and Fig. 2 b, pressure vapour threeway bend pipe 13, the first low pressure admission pipe 11 and the second low pressure admission pipe 12 and a low pressure straight section connecting tube 10 in the comprising of the utility model;
The front end of said low pressure straight section connecting tube 10 seals, and the rear end is an opening;
Pressure vapour threeway bend pipe 13 comprises two symmetrically arranged straight tubes 131 and a middle bend pipe 133 in said; Said two symmetrically arranged straight tubes 131 are connected with two middle pressure steam ports of intermediate pressure cylinder, and said middle bend pipe 133 and the rear end of said low pressure straight section connecting tube 10 are connected;
The purpose of design is like this, and the structure of intermediate pressure cylinder adopts the structure of senior middle school's pressing cylinder more at present, and the displacement of senior middle school's pressing cylinder is big, and it is necessary to be equipped with two middle pressure steam ports so on senior middle school's pressing cylinder.Therefore the purpose of design is like this: through the straight tube 131 and the middle bend pipe 133 of two symmetries, the steam flow of two middle pressure steam ports is merged into one steam flow.
The said first low pressure admission pipe, the 11 vertical low pressure admission mouths that connect on the said low pressure straight section connecting tube 10 and first low pressure (LP) cylinder, the said second low pressure admission pipe, the 12 vertical low pressure admission mouths that connect on the said low pressure straight section connecting tube 10 and second low pressure (LP) cylinder.
Design can avoid the use of the knuckle bend pipe and connects low pressure straight section connecting tube 10 and the harmful effect that low pressure admission mouth on the low pressure (LP) cylinder causes like this, and velocity distribution is evenly and large-scale eddy flow do not occurring near low pressure admission pipe side at the low pressure admission mouth place of low pressure (LP) cylinder to make steam.Such improvement significantly reduces the vapour losses of connecting tube structure itself; Improve the first order and the follow-up some grades of stage efficiencies that the leaf passage is arranged in the low pressure (LP) cylinder, thereby improve the overall efficiency of steam turbine.
Simultaneously, the joint of the joint of the first low pressure admission pipe 11 and first low pressure (LP) cylinder and the second low pressure admission pipe 12 and second low pressure (LP) cylinder, the joint between low pressure straight section connecting tube 10 and the middle pressure vapour threeway bend pipe 13 all adopt flange to connect.
Such design forms low pressure straight section connecting tube 10 and supports, and does not need to add in addition the spring bracing structure, saves material greatly, has also made things convenient for the repairing for steam turbine simultaneously.
Low pressure straight section connecting tube 10 is adopted the design of constant speed variable cross section; Be to be divided into the first low pressure straight section connecting tube 101 and the second low pressure straight section connecting tube 102 that is positioned at second low pressure cylinder top that is positioned at first low pressure (LP) cylinder top said low pressure straight section connecting tube 10; The mesolow displacement of the second low pressure straight section connecting tube 102 has only the half the of the first low pressure straight section connecting tube 101, promptly the section area of the second low pressure straight section connecting tube 102 be first low pressure straight section connecting tube 101 section area half the.Connected element 103 between the first low pressure straight section connecting tube 101 and the second low pressure straight section connecting tube 102 is a flange, and on the first low pressure straight section connecting tube 101, the pipeline section between the first low pressure admission pipe 11 and said flange is set to tapering transition section 104; Simultaneously, the section area of the second low pressure admission pipe 12 is section area half the of the first low pressure admission pipe 11.Such design can economical with materials 25%.
Compound hinge type expansion joint 17, compound pull rod type expansion joint 14 and bend pipe pressure balance type expansion joint 15 are set respectively on the said connecting tube structure;
Said compound hinge type expansion joint 17 is arranged on two straight tubes 131 of pressure vapour threeway bend pipe 13; The purpose of design is to avoid the horizontal thermal walking of two middle pressure steam ports to be delivered on low pressure straight section connecting tube 10 like this.
Said compound pull rod type expansion joint 14 is on the first low pressure straight section connecting tube 101 between the middle pressure vapour threeway bend pipe 13 and the first low pressure admission pipe 11; Said compound pull rod type expansion joint 14 is made up of two work bellowss and the intervalve between said two work bellowss.
Said bend pipe pressure balance type expansion joint 15 was positioned on second low pressure straight section connecting tube 102 of rear and front end of the second low pressure admission pipe 12, and said bend pipe pressure balance type expansion joint 15 is made up of balance bellows on the second low pressure straight section connecting tube 102 that is positioned at second steam inlet pipe, 12 front ends and the work bellows on the second low pressure straight section connecting tube 102 that is positioned at the second low pressure admission pipe, 12 rear ends.
The purpose of design is like this: through compound pull rod type expansion joint 14 absorb between first steam inlet pipes 11 and the middle pressure steam pipe 13 low pressure straight section connecting tube 10 axial heat expansion difference and the short transverse heat expansion poor, through axial thermal expansion difference and the balance thrust of the low pressure straight section connecting tube 10 between the bend pipe pressure balance type expansion joint 15 absorption second low pressure admission pipes 12 and the first low pressure admission pipe 11.
Said compound pull rod type expansion joint 14 is connected through linkage structure 16 with bend pipe pressure balance type expansion joint 15.Said linkage structure 16 comprises first end plate 161 that is arranged at bend pipe pressure balance type expansion joint 15 front ends; Be arranged at second end plate 162 of bend pipe pressure balance type expansion joint 15 rear ends; Be arranged at the 3rd end plate 163 and the 4th end plate 164 that is positioned at compound pull rod type expansion joint 14 front ends of compound pull rod type expansion joint 14 rear ends; And four connecting rods; Said connecting rod passes second end plate 162 and the 3rd end plate 163, and the two ends of said connecting rod are fixing with first end plate 161 and the 4th end plate 164 respectively through nut.
Such design has not only guaranteed the free heat expansion of whole mesolow connecting tube structure, has also guaranteed the rigidity of whole steam turbine mesolow connecting tube structure.
Those of ordinary skill in the art will be appreciated that; Above embodiment is used for explaining the utility model; And be not the qualification that is used as the utility model; As long as in the connotation scope of the utility model, all will drop in claims scope of the utility model the above embodiment's variation, modification.
Claims (4)
1. a steam turbine mesolow connecting tube structure comprises the first low pressure admission pipe (11) and the second low pressure admission pipe (12), it is characterized in that:
Said connecting tube, structure also comprised low pressure straight section connecting tube (10) and middle pressure vapour threeway bend pipe (13);
Wherein middle pressure vapour threeway bend pipe (13) comprises two symmetrically arranged straight tubes (131) and a middle bend pipe (133); Said two symmetrically arranged straight tubes (131) are connected with two middle pressure steam ports on the intermediate pressure cylinder, said in the middle bend pipe (133) and the rear end of said low pressure straight section connecting tube (10) of pressure vapour threeway bend pipe (13) be connected; The said first low pressure admission pipe (11) vertically connects the low pressure admission mouth on the said low pressure straight section connecting tube (10) and first low pressure (LP) cylinder, and the said second low pressure admission pipe (12) vertically connects the low pressure admission mouth on the said low pressure straight section connecting tube (10) and second low pressure (LP) cylinder.
2. steam turbine mesolow connecting tube structure according to claim 1 is characterized in that:
Be divided into the first low pressure straight section connecting tube (101) of the top that is positioned at said first low pressure (LP) cylinder said low pressure straight section connecting tube (10) and be positioned at second low pressure straight section connecting tube (102) of the top of said second low pressure (LP) cylinder; The section area of the said second low pressure straight section connecting tube (102) be said first low pressure straight section connecting tube (101) section area half the, between said first low pressure straight section connecting tube (101) and the said second low pressure straight section connecting tube (102) intermediate connecting part (103) is set;
The section area of the said second low pressure admission pipe (12) is the half the of said first low pressure admission pipe (11) section area.
3. steam turbine mesolow connecting tube structure according to claim 2 is characterized in that:
Said intermediate connecting part (103) is a flange, and the pipeline section that is positioned between said first low pressure admission pipe (11) and the said flange on the said first low pressure straight section connecting tube (101) is set to tapering transition section (104).
4. steam turbine mesolow connecting tube structure according to claim 1 is characterized in that:
Compound hinge type expansion joint (17), compound pull rod type expansion joint (14) and bend pipe pressure balance type expansion joint (15) are set respectively on the said steam turbine mesolow connecting tube structure:
Said compound hinge type expansion joint (17) is arranged on two symmetrically arranged straight tubes (131) of said pressure vapour threeway bend pipe (13);
Said compound pull rod type expansion joint (14) was arranged on the first low pressure straight section connecting tube (101) between said pressure vapour threeway bend pipe (13) and the said first low pressure admission pipe (11);
Said bend pipe pressure balance type expansion joint (15) was positioned on second low pressure straight section connecting tube (102) of rear and front end of the said second low pressure admission pipe (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203229391U CN202250269U (en) | 2011-08-30 | 2011-08-30 | Low-pressure communicating pipe structure in steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203229391U CN202250269U (en) | 2011-08-30 | 2011-08-30 | Low-pressure communicating pipe structure in steam turbine |
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| Publication Number | Publication Date |
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| CN202250269U true CN202250269U (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011203229391U Expired - Lifetime CN202250269U (en) | 2011-08-30 | 2011-08-30 | Low-pressure communicating pipe structure in steam turbine |
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| CN (1) | CN202250269U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104963728A (en) * | 2015-06-25 | 2015-10-07 | 北京全三维能源科技股份有限公司 | Ultrahigh pressure impulse steam turbine |
-
2011
- 2011-08-30 CN CN2011203229391U patent/CN202250269U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104963728A (en) * | 2015-06-25 | 2015-10-07 | 北京全三维能源科技股份有限公司 | Ultrahigh pressure impulse steam turbine |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120530 |