This standard specifies the dimensioning, tolerances and technical requirements of the fir-tree blade root and blade root groove of gas turbine turbine blades. This standard applies to the fir-tree blade root and the fir-tree blade root groove of the wheel of gas turbine turbine blades. JB/T 6690-1993 Tolerances and technical requirements of fir-tree blade root and groove of gas turbine turbine blades JB/T6690-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T6690-1993
Gas Turbine Blade Fir Tree
Blade Root, Groove Tolerance and Technical Requirements
Published on 1993-06-01
Ministry of Machinery Industry of the People's Republic of China
Implemented on 1994-01-01
Mechanical Industry Standard of the People's Republic of China
Gas Turbine Blade Fir Tree
Blade Root, Groove Tolerance and Technical Requirements
Subject Content and Scope of Application
JB/T 6690-1993
This standard specifies the dimensioning, tolerance and technical requirements of the fir tree blade root and blade root groove of gas turbine blade. This standard applies to the fir tree blade root and the fir tree blade root groove of the wheel of gas turbine turbine blade. 2
Cited Standards
GB2900.47
3 Terms and Special Numbers
3.1 Terms
Electrical Terms
Gas Turbine
3.1.1 Blade Root
A blade with a certain size and shape fixed on the disc (rotor body) or cylinder (carrier ring). 3.1.2 Fir-tree Blade Root (Blade Root Groove)
A blade root (blade root groove) with two or more pairs of teeth (grooves) and a fir-tree-shaped cross-section. 3.1.3 Tooth Working Surface
The bearing surface of the teeth (grooves) of the blade root (blade root groove) during operation. 3.1.4 Nodal line
The straight line that determines the position and geometric elements of the birch tooth (sample tooth). 3.1.5 Wedge angle
The angle between two nodal lines of the blade (leaf root groove). 3.1.6 Node
The intersection of the nodal line and the working surface of the tooth (sample tooth groove). 3.1.7 Node generatrix
The straight line formed by the nodes on the working surface of each sample tooth (sample tooth groove). 3.1.8 Node spacing
The distance between two nodes on the same pair of birch teeth (sample tooth groove). 3.1.9 Tooth pitch
The distance between the nodes on two adjacent sample teeth (rod tooth grooves) on the same side. 3.1.10 Tooth height
The distance from the top of the rod tooth to the root of the tooth in the direction perpendicular to the nodal line. 3.1.11 Tooth top height
The distance from the top of the sample tooth to the nodal line.| |tt||3.1.12 Tooth thickness
The thickness of the sample tooth on the pitch line.
3.1.13 Tooth groove width
Approved by the Ministry of Machinery Industry on June 1, 1993
Implemented on January 1, 1994
The tooth width on the pitch line. wwW.bzxz.Net
3.1.14 Pressure angle
JB/T6690-1993
The angle between the working surface of the bar tooth (tooth) at the node and the straight line perpendicular to the pitch line. 3.1.15 Tooth profile angle
The angle between the working surface of the sample tooth (row of tooth grooves) and the non-working surface. 3.1.16 Blade root (blade root groove) symmetry plane
The bisector plane of the blade root (blade root groove) die angle.
3.2 Graphics
Part The graphs of the technical spectrum are shown in Figures 1 and 2.
First pair of teeth
Working surface
Non-working surface
First pair of teeth
Working principle
Working position
3.3 Symbols
Some symbols of the terms shall be as specified in Table 1
Figure 2 Blade root groove
Symmetric plane
Symmetric plane
Demographic selection
Root precision
JB/T6690-1993
Node run-in distance
The first datum is the symmetric plane of the blade root and the blade root, see Figures 3 and 4.
High tooth top height
Plant width
Pressure angle
Thrust angle
First pair of teeth
Working principle
Working position
3.3 Symbols
Some symbols of the terms shall be as specified in Table 1
Figure 2 Blade root groove
Symmetric plane
Symmetric plane
Demographic selection
Root precision
JB/T6690-1993
Node run-in distance
The first datum is the symmetric plane of the blade root and the blade root, see Figures 3 and 4. The second datum is a plane perpendicular to the first datum through a node generatrix on the first pair of teeth (sample tooth grooves), see Figure 3 and Figure 4. First datum
First datum
Second datum
5 Dimensioning
Blade root groove
5.1 Grain dimensioning is connected to Figure 5, and blade root groove dimensioning is Figure 6. 5.1.1 The tooth is marked one by one based on the node on the first pair of sample teeth "sample tooth grooves". 3
JB/T6690-1993
5.1.2 The pitch is only marked on the first pair of sample teeth (sample tooth grooves) and the last pair of sample teeth (sample tooth grooves). 5.1.3 The mold angle and tooth height are reference dimensions.
5.2 For arc-shaped fir-tree-shaped blade roots, the corresponding blade root arc radius and circumference position should be marked again. 5.3 Figures 5 and 6 are examples of blade roots (blade root grooves) with three pairs of sample teeth in the form of arc tooth root and plane tooth top. For blade roots (blade root grooves) with arc tooth top or other local structural forms, except for the relevant dimensions, the remaining dimensions are still marked according to this marking example. Figure 5 Blade Grain
Technical Requirements
6.1 The parallelism of the same pair of node generatrix on the second datum over the entire length of the blade root (blade root groove) (F), that is, the difference in the node spacing at the inlet and outlet ends. Figure 6 Blade Root Groove
JB/T6690-1993
The difference in the maximum distance from the same pair of nodes to the second datum over the entire length of the blade root (blade root groove) is the offset (D). 6.2
Dimension Tolerance
Dimension tolerance and limit deviation shall be as specified in Table 2. Table 2
Node spacing
Tooth quotient
Tooth profile angle
Pressure angle
Tooth root arc
Tooth pre-arc
Note: 1)
Tolerance zone distribution is specified by design.
Parallelism and misalignment
Parallelism and misalignment are specified in Table 3.
Parallelism
Surface roughness
Tolerance"
Limit deviation
The surface roughness of the blade root (blade root groove) is specified in Table 4. F
Other parts
Tolerance"
Limit deviation
±10°
Surface roughness
For example, the marking of the blade root and blade root groove is shown in Figures A1 and A2. JB/T 66901993
Appendix A
Marking example
(reference)
[(36'40
【36*40\
Blade root groove
Other steps
70.7±0. 02
1.6±0.01
-3.2±0.01
o.7±0.02
Additional Notes:
This standard was proposed by Nanjing Gas Turbine Research Institute. This standard is under the jurisdiction of Nanjing Gas Turbine Research Institute. This standard was drafted by Wuxi Blade Factory. JB/T6690-1993
This standard was drafted by Nanjing Steam Turbine and Electric Motor Factory, Harbin Steam Turbine Factory, Shaanxi Blower Factory, Shanghai Steam Turbine Factory, and Shanghai Power Equipment Complete Design Institute.
The main drafters of this standard are Hu Xiaolin and Guo Huanfei.
Mechanical Industry Standard of the People's Republic of China
Gas Turbine Blade Fir Tree Type
Blade Root, Groove Tolerance and Technical Requirements
JB/T 6690-1993
Published by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2, Shouti South Road, Beijing
Langbian 100044)
01/16Printed SheetX/XNumber of WordsXXX,XXX
Format880X×1230
EditionX,XX,19XXPrinted inXX,XX,19XXPrinted Number1-XXX
PriceXXX.XXYuan
Serial NumberXX-XXX
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