CN2883679Y - Final blade of large-scale air cooling turbine - Google Patents

Abstract

The utility model discloses a terminal grade blade of large air cooling steam turbine, relating to a steam turbine blade, which is designed for solving the problems of the prior steam turbine blades in low work efficiency and unsafe in running, comprising a blade type line part (1), a blade root (2), a cover band (3) and a bracing (4); wherein, the blade type line part (1) is 680 mm in height H and is of a variable cross-sectional twisted blade, which is adjacent two cross sections with relative twists, and the cross section shape of the blade is changed along the different height of the blade and the section space area is decreased gradually. The blade roots (2) are inclined tooth side entry blade roots with an axial width W of 310mm. The blade top is a crown guide damping cover band (3) with a depth B of 25mm and a working surface axially distance J of 40.47mm. The bracing (4) is a built-in lug boss bracing. The utility model has the advantages of convenient assembly, large steam drainage space area, small leaving velocity loss and easiness to dynamically regulate frequency, preventing the disadvantages caused by the prior riveted cover bands of stress concentration and the half-sectioned reinforce cracking of the bracings easily.

Description

Large air-cooled turbine machine exhaust stage blade

Technical field

The utility model relates to a kind of turbine blade.

Background technique

Because the design back pressure height and the back pressure excursion of Air-cooled Unit are big, and the variation of ambient temperature scope of atmosphere is also bigger, making exhaust stage blade to satisfy can move under the air blast operating mode by blocking operating mode.Under low back pressure, obstruction operating mode or high back pressure, air blast operating mode, the operating conditions of exhaust stage blade is all very abominable, influences safe operation, and the shroud of existing turbine blade and blade are riveted joints, easily produces stress in riveted joint place and concentrates; Lacing wire is ftractureed in the working procedure, so exist the problem of the problem of inefficiency, working procedure poor reliability easily for partly cuing open lacing wire.

The model utility content

There are inefficiency, the unsafe problem of working procedure for solving existing turbine blade, and then provide a kind of large air-cooled turbine machine exhaust stage blade, it has easy to assembly, leaving area is big, leaving loss is little, the characteristics that help moving frequency modulation have been avoided riveting in the past stress that shroud causes and have been concentrated, partly cutd open the lacing wire problem of the property difference safe and reliable to operation brought of cracking easily.The utility model is made up of vane type line part 1, blade root 2, shroud 3 and lacing wire 4, the height H of vane type line part 1 is 680mm, vane type line part 1 is the variable cross section twisted blade, be to have relatively between adjacent two sections to reverse, reduce gradually along the sectional shape difference and the section area of blade height blade; Blade root 2 is a helical teeth vertical tree type blade root, and the axial width W of blade root 2 is 310mm; The leaf top is self-crown damping shroud 3, and shroud 3 thickness B are 25mm, and shroud 3 working surface axial distance J are 40.47mm; Lacing wire 4 is for carrying boss tie pieces.The utility model by design specialized strengthen leaf, rationally control root of blade degree of reaction and degree of reaction along the high distribution of leaf, suitably adopt method such as negative angle of attack, thereby the Security of Air-cooled Unit exhaust stage blade design and high efficiency are organically combined, guarantee Air-cooled Unit variable working condition safe and highly efficient operation, can be used as the exhaust stage blade of subcritical, the overcritical Turbine with Air Cooled of variable power scope 300MW～600MW grade.The utlity model has following advantage: 1. this exhaust stage blade has adopted bending to unite to be shaped full three dimensional design, and movable vane forms the compound bending chip level that comes into leaves along counter the turning round of leaf height.2. vane tip adopts and carries shroud, and the problem of stress concentration that does not exist riveted joint to cause is reduced the loss, and multi-disc sealing gland tooth can be assembled in the top, prevents gas leakage, improves unit efficiency; 3. lacing wire adopts whole circle boss tie pieces can make blade have better aeroperformance for carrying boss tie pieces between the blade, can better form whole circle in addition under the effect of twist recovery, improves blade rigid, and the phenomenon of having avoided lacing wire to snap takes place; 4. blade root is adopted fir-tree root, the bearing capacity height, easy for installation, the blade root axial width is little, can guarantee that whole circle is packed into together when assembling.

Description of drawings

Fig. 1 is an overall structure schematic representation of the present utility model, and Fig. 2 is the left view of Fig. 1, and Fig. 3 is the plan view of Fig. 1, and Fig. 4 is the superimposed schematic representation of blade profile line of the present utility model.

Embodiment

Embodiment one: (referring to Fig. 1-Fig. 4) present embodiment is made up of vane type line part 1, blade root 2, shroud 3 and lacing wire 4, the height H of vane type line part 1 is 680mm, vane type line part 1 is the variable cross section twisted blade, be to have relatively between adjacent two sections to reverse, sectional shape difference and section area along the blade height blade reduce gradually, with the rising of blade height, the section area of this blade is from 47.665～8.207cm ², maximum ga(u)ge does corresponding change from 232.698～142.5mm, axial width from 230～39.55mm from 2.612～2.395mm, chord length from 26.457～8.44mm, established angle from 81.747～15.498 °, trailing edge thickness; Be respectively 20mm in blades height, 204mm, 374mm, 544mm, the 660mm place, the axial width of this blade is corresponding to be respectively: 217.569mm, 144.528mm, 98.102mm, 61.94mm, 41.783mm, chord length is corresponding to be respectively: 220.424mm, 158.775mm, 140.514mm, 141.443mm, 142.657 mm, the corresponding 2.603mm that is respectively of trailing edge thickness, 2.547mm, 2.546mm, 2.484mm, 2.418mm, established angle is corresponding to be respectively: 81.263 °, 65.922 °, 44.248 °, 25.555 °, 16.432 °, maximum ga(u)ge is corresponding to be respectively: 26.804mm, 25.643mm, 20.78mm, 10.619mm, 8.64mm section area is corresponding to be respectively: 45.082cm ², 27.820cm ², 374cm ², 544cm ², 660cm ²Blade root 2 is a helical teeth vertical tree type blade root, and the axial width W of blade root 2 is 310mm; The leaf top is self-crown damping shroud 3, and shroud 3 thickness B are 25mm, and shroud 3 working surface axial distance J are 40.47mm; Lacing wire 4 is for carrying boss tie pieces.

The concrete parameter in each cross section is as shown in the table:

Cross section number	Axial width mm	Chord length mm	Trailing edge thickness mm	Established angle °	Maximum ga(u)ge mm	Depth of section mm	Section area cm
								A-A	230.00	232.698	2.612	81.747	26.457	0	47.657
B-B	217.569	220.424	2.603	81.263	26.804	20	45.082

C-C	192.835	196.853	2.582	78.915	26.863	68	39.321
								D-D	166.7	174.567	2.559	73.202	26.144	136	32.692
E-E	144.528	158.775	2.547	65.922	25.643	204	27.820
								F-F	124.313	148.28	2.541	57.197	24.146	272	23.827
G-G	106.22	142.093	2.547	48.437	22.077	340	20.181
								H-H	98.102	140.514	2.546	44.248	20.78	374	18.783
I-I	90.231	140.013	2.546	40.003	19.134	410	17.649
								J-J	76.634	140.05	2.537	32.896	14.257	476	13.201
K-K	61.94	141.443	2.484	25.555	10.619	544	10.165
								L-L	48.573	142.429	2.459	19.393	9.453	612	9.462
M-M	41.783	142.657	2.418	16.432	8.64	660	8.645
								N-N	39.546	142.505	2.395	15.498	8.44	680	8.207

Claims (3)

1, large air-cooled turbine machine exhaust stage blade, it is made up of vane type line part (1), blade root (2), shroud (3) and lacing wire (4), the height H that it is characterized in that vane type line part (1) is 680mm, vane type line part (1) is the variable cross section twisted blade, be to have relatively between adjacent two sections to reverse, reduce gradually along the sectional shape difference and the section area of blade height blade; Blade root (2) is a helical teeth vertical tree type blade root, and the axial width W of blade root (2) is 310mm; The leaf top is self-crown damping shroud (3), and shroud (3) thickness B is 25mm, and shroud (3) working surface axial distance J is 40.47mm; Lacing wire (4) is for carrying boss tie pieces.

2, large air-cooled turbine machine exhaust stage blade according to claim 1 is characterized in that the rising with blade height, and the section area of this blade is from 47.665～8.207cm ², maximum ga(u)ge does corresponding change from 232.698～142.5mm, axial width from 230～39.55mm from 2.612～2.395mm, chord length from 26.457～8.44mm, established angle from 81.747～15.498 °, trailing edge thickness.

3, large air-cooled turbine machine exhaust stage blade according to claim 1, it is characterized in that blades height is respectively 20mm, 204mm, 374mm, 544mm, the 660mm place, the axial width of this blade is corresponding to be respectively: 217.569mm, 144.528mm, 98.102mm, 61.94mm, 41.783mm, chord length is corresponding to be respectively: 220.424mm, 158.775mm, 140.514mm, 141.443mm, 142.657mm, the corresponding 2.603mm that is respectively of trailing edge thickness, 2.547mm, 2.546mm, 2.484mm, 2.418mm, established angle is corresponding to be respectively: 81.263 °, 65.922 °, 44.248 °, 25.555 °, 16.432 °, maximum ga(u)ge is corresponding to be respectively: 26.804mm, 25.643mm, 20.78mm, 10.619mm, 8.64mm section area is corresponding to be respectively: 45.082cm ², 27.820cm ², 374cm ², 544cm ², 660cm ²

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