CN1016885B - Molded line of internal bore for large (sleeved impeller) of steam turbine in electricity generating plant - Google Patents
Molded line of internal bore for large (sleeved impeller) of steam turbine in electricity generating plantInfo
- Publication number
- CN1016885B CN1016885B CN 88108486 CN88108486A CN1016885B CN 1016885 B CN1016885 B CN 1016885B CN 88108486 CN88108486 CN 88108486 CN 88108486 A CN88108486 A CN 88108486A CN 1016885 B CN1016885 B CN 1016885B
- Authority
- CN
- China
- Prior art keywords
- impeller
- molded line
- steam turbine
- internal bore
- interference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The present invention provides a new molded line of an inner hole of a sheathed impeller in a large-sized steam turbine. The molded line is a combined interference molded line of an inner hole and is composed of a straight line segment parallel with a central shaft of the impeller and an oblique line having a certain oblique degree with the central shaft of the impeller. The molded line of an inner hole causes the stress of the inner hole of the impeller to be uniform, gives full play to the carrying capability for materials and still has the advantages of convenient processing and positioning, easy assurance for processing and assembling precision, etc.
Description
The present invention relates to a kind of dynamic power machine, particularly a kind of shrunk-on disc of power station steam turbine.
The large steam turbine low pressure rotor mainly contains integral rotor in the world at present, three kinds of structural types of welded disc turbine rotor and rotor bushing.Low pressure rotor is if adopt the rotor bushing of being made up of a plurality of shrunk-on discs, for adopting integral rotor or welded disc turbine rotor, its advantage is not need large-sized forging equipment or complicated welding job equipment, can reduce equipment investment, reduce manufacture cost significantly, and it is with short production cycle, forging quality guarantees easily, but shrunk-on disc is owing to structural restriction, and the impeller diameter of bore is bigger, and must there be enough interference to cooperate and guarantee that impeller is not loosening with axle in the working speed scope with axle, the rotor stress of other two kinds of patterns of the stress ratio of its endoporus is big, therefore, how can guarantee the firm interference fit of impeller and axle.Make the stress equalizing of impeller endoporus again as far as possible, the bearing capacity of giving full play to material just becomes a subject matter of shrunk-on disc research.
Theoretically, the shrunk-on disc molded line of internal bore of large-size steam turbine low pressure rotor should adopt the structural type as Fig. 1 (A), this is remaining interference such as a kind of grade, is a kind of desirable interference form, and it is then inequality that each point of contact has uniform remaining interference each point assembling interference under working speed.But because this molded line of internal bore is a curve, processing, assembling and location are all very difficult, therefore do not adopt in the practice.
At present, the shrunk-on disc molded line of internal bore of large-size steam turbine low pressure rotor mostly adopts the structural type of Fig. 1 (B), and this is a kind of over-surplus fit structure that waits, and surface of contact is parallel with axle, open a groove at the impeller endoporus, each point of contact has identical assembling interference value on the surface of contact.This molded line of internal bore is convenient to processing, the location, and guarantee processing, assembly precision easily.But it is inhomogeneous with the deformation distribution of axle, and near its distortion end face is little, if adopt the interference identical with core, wherein a part of magnitude of interference is unnecessary, can cause bigger endoporus stress.It shown in Fig. 1 (C) linear interference molded line of internal bore.This structure is processed as taper with endoporus, and the magnitude of interference of each point of contact is linear distribution vertically, thereby has reduced impeller endoporus stress.
U.S. Pat 2730387 discloses a kind of turbine rotor assembly, one end of its rotor stretches out wheel hub one segment distance, and makes it to become drive fit with wheel hub with being threaded with the fastening piece of teeth groove, and its shortcoming is, processing difficulties, and be not suitable for the steam turbine of the common multistage shrunk-on disc of employing.
The objective of the invention is to propose a kind of shrunk-on disc of power station steam turbine, adopt reasonable and practical molded line of internal bore, make impeller endoporus stress be tending towards even, give full play to the bearing capacity of material, and still keep processing, location convenient, guarantee processing, assembly precision easily and do not need to increase advantage such as any component.
With reference to Fig. 2, the present invention includes an impeller that matches with rotor, the molded line of internal bore that impeller matches with rotor is made of hole slot in contact area molded lines and the relief area, wherein:
1. the molded lines of impeller endoporus contact area: impeller endoporus BC and DE section are for being parallel to the straightway (promptly waiting the interference section) of impeller middle spindle (X-axis), and its segment length is L
2Impeller endoporus AB and EF section are oblique line section (being linear interference section), and the segment length is L
1: L is the impeller width among the figure;
2. inside groove in the impeller endoporus relief area, groove width is L
3;
With impeller endoporus interference fit the axle be the equal diameter section.The interference of the interference of the straightway of this molded line of internal bore and oblique line section and gradient can be calculated according to spatial axes symmetry nonlinear contact problem finite element method and determine, and determine L by calculating
1, L
2And L
3(S.K.Chan ﹠amp; I.S.Tuba. " A Finite Element Method for Contact problems of Solid Bodies ", Part I, Theory ﹠amp; Validation, Int.J.Meth.Sci.Vol.13,1971, pp519-530) (D.J.White ﹠amp; L.R.Enderby, " Finite Element Stress Analysis of a Nonlinear Problem:A Correcting Rod Ege Loaded by means of a Pin, " J.Strain Analysis, 5,41-48,1970).
Advantage of the present invention is compared with traditional interference molded line of internal bore that waits, for example to 200,000 kilowatts of steam turbine last stage impellers, under same load and speed conditions, impeller endoporus stress obviously reduces, and impeller can or be used with the one-level material with the material (being reduced to the material of 750MPa by the material of yield 850MPa) that hangs down one-level increase safety coefficient; And reduce the working stress peak value at impeller endoporus both sides A, F point place.Thereby improved impeller stress corrosion resistant intensity.Calculating shows adopts interior hole slot except that traditional effect is arranged, and can also reduce the average stress of impeller endoporus, thereby improve the safety reliability of impeller.
The present invention compares with pure linear interference molded line of internal bore, has reduced the erection stress peak value that endoporus C point and D are ordered, and impeller endoporus machining accuracy is controlled easily, because the impeller endoporus has straightway, guarantees the centering with axle during the vertical cover of impeller easily.
Fig. 1 is the structure principle chart of existing large-size steam turbine low pressure rotor shrunk-on disc.
Fig. 2 is a structure principle chart of the present invention.
Among Fig. 1, (1) is that impeller, (A) are that theoretical construct pattern, (B) of impeller (1) is the existing structure form of impeller (1), (C) is pass in the linear interference.
Among Fig. 2, (1) is impeller, and BC and DE section are the interference section, and its length is L
2, AB and EF section are linear interference section, its length is L
1, L is the impeller width; L
3Width for inside groove in the impeller endoporus relief area.
Embodiment:
The shrunk-on disc of 200MW steam turbine last stage band 800mm blade, 3000 rev/mins of working speeds, impeller diameter of bore are 560mm; Impeller width L=549mm; Deng interference section: L
2≤ 1/3L
1, and L
2〉=3cm,
Present embodiment is got L
2=3cm,
This moment interference value Δ Rmax=0.062262cm such as maximum
Interference value Δ Rmin=0.060762cm such as minimum
Impeller endoporus well width L
3=(1/3～2/5) L,
Present embodiment is got L
3=1/3L=18.9cm
The gradient of oblique line section is 0.7/1000～1.0/1000,
It is 0.9/1000 that present embodiment is got gradient;
The result shows, under same load and speed conditions, compares with existing traditional interference impeller molded line of internal bore that waits, and impeller endoporus stress obviously reduces, and impeller can be used the material (being reduced to the material of 750MPa by the material of yield 850MPa) of low one-level.
Claims (2)
1, a kind of shrunk-on disc of power station steam turbine, comprise an impeller that matches with rotor, the molded line of internal bore that impeller matches with rotor is made of hole slot in contact area molded lines and the relief area, it is characterized in that endoporus contact area molded lines is by the straightway L that is parallel to impeller middle spindle
2With the oblique line section L that becomes constant slope with impeller middle spindle
1The combined interference section that is constituted.
2,, it is characterized in that straightway L should be more than or equal to 3 centimetres and less than L according to the described shrunk-on disc of claim 1
11/3rd, the gradient of oblique line section is between 0.7/1000th to 1.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88108486 CN1016885B (en) | 1988-12-07 | 1988-12-07 | Molded line of internal bore for large (sleeved impeller) of steam turbine in electricity generating plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88108486 CN1016885B (en) | 1988-12-07 | 1988-12-07 | Molded line of internal bore for large (sleeved impeller) of steam turbine in electricity generating plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1043367A CN1043367A (en) | 1990-06-27 |
| CN1016885B true CN1016885B (en) | 1992-06-03 |
Family
ID=4835087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88108486 Expired CN1016885B (en) | 1988-12-07 | 1988-12-07 | Molded line of internal bore for large (sleeved impeller) of steam turbine in electricity generating plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1016885B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1329629C (en) * | 2002-05-06 | 2007-08-01 | Abb涡轮***有限公司 | Device for fixing a rotor on a shaft |
-
1988
- 1988-12-07 CN CN 88108486 patent/CN1016885B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1329629C (en) * | 2002-05-06 | 2007-08-01 | Abb涡轮***有限公司 | Device for fixing a rotor on a shaft |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1043367A (en) | 1990-06-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |