阅读说明：本技术 一种燃气轮机轮盘拉杆组合式转子的拉杆螺栓紧固装置 (Pull rod bolt fastening device of gas turbine wheel disc pull rod combined rotor ) 是由 肖俊峰 高松 上官博 张蒙 闫安 李园园 于飞龙 段静瑶 于 2021-09-14 设计创作，主要内容包括：本发明公开了一种燃气轮机轮盘拉杆组合式转子的拉杆螺栓紧固装置,该燃气轮机轮盘拉杆组合式转子包括同轴依次连接的左轴头、压气机轮盘、中间轴、透平轮盘和右轴头；压气机轮盘、中间轴和透平轮盘上周向均布有多个拉杆孔,各级压气机轮盘串联并由多个拉杆螺栓紧固连接,各级透平轮盘串联并由多个拉杆螺栓紧固连接,压气机段与透平段由中间轴和螺栓紧固连接。本发明解决了拉杆螺栓两端均采用螺纹与螺母连接时,拉杆螺栓从进气端穿入安装定位不准确,拉杆螺栓与螺母容易整体向圆周外侧方向偏移等问题,方便拉杆螺栓安装,扭矩传递性能好,适用于燃气轮机轮盘拉杆组合式转子,能够提高燃气轮机轮盘拉杆组合式转子整体的安全性和可靠性。(The invention discloses a pull rod bolt fastening device of a wheel disc pull rod combined rotor of a gas turbine, wherein the wheel disc pull rod combined rotor of the gas turbine comprises a left shaft head, a compressor wheel disc, an intermediate shaft, a turbine wheel disc and a right shaft head which are coaxially and sequentially connected; the gas compressor wheel disc, the intermediate shaft and the turbine wheel disc are circumferentially and uniformly provided with a plurality of pull rod holes, the gas compressor wheel discs at all levels are connected in series and are fastened and connected by a plurality of pull rod bolts, the turbine wheel discs at all levels are connected in series and are fastened and connected by a plurality of pull rod bolts, and the gas compressor section and the turbine section are fastened and connected by the intermediate shaft and the bolts. The invention solves the problems that when the two ends of the pull rod bolt are both connected with the nut by threads, the pull rod bolt penetrates from the air inlet end and is not accurately installed and positioned, the pull rod bolt and the nut are easy to integrally deviate towards the circumferential outer side direction, and the like, is convenient for installing the pull rod bolt, has good torque transmission performance, is suitable for the wheel disc and pull rod combined rotor of the gas turbine, and can improve the integral safety and reliability of the wheel disc and pull rod combined rotor of the gas turbine.)

1. A pull rod bolt fastening device of a wheel disc pull rod combined rotor of a gas turbine is characterized in that the wheel disc pull rod combined rotor of the gas turbine comprises a left shaft head (1), a compressor wheel disc (3), an intermediate shaft (4), a turbine wheel disc (5) and a right shaft head (2) which are coaxially and sequentially connected; the gas compressor wheel disc (3), the intermediate shaft (4) and the turbine wheel disc (5) are circumferentially and uniformly provided with a plurality of pull rod holes (7), the gas compressor wheel discs (3) at all levels are connected in series and are fixedly connected by a plurality of pull rod bolts (6), the turbine wheel discs (5) at all levels are connected in series and are fixedly connected by a plurality of pull rod bolts (6), and the gas compressor section and the turbine section are fixedly connected by the intermediate shaft and the bolts.

2. The tie bolt fastening device of the gas turbine wheel disc tie rod combined rotor according to claim 1, characterized in that the tie bolt (6) adopts a mode of combining a screw (8) and a nut (9), the threaded end of the tie bolt (6) penetrates into each tie rod hole (7) of the left axle head (1), so that the threaded end is on the left side of the compressor section, the threaded end is on the right side of the compressor section, and the nut (9) is in threaded connection with the threaded end of the tie bolt (6).

3. The tie-rod bolt fastening device of the gas turbine wheel disc tie-rod combined rotor according to claim 2, characterized in that the tie-rod hole (7) is in a counter bore manner, and the nut of the tie-rod bolt (6) is sunk into the nut counter bore (13).

4. The tie bolt fastening device of a gas turbine disk tie rod combined rotor according to claim 2, characterized in that the upper surface of the screw (8) of the tie bolt (6) is a flat nut (18) or a spherical nut (19).

5. The tie rod bolt fastening device of the tie rod combined rotor of the wheel disc of the gas turbine as claimed in claim 1, characterized in that the tie rod screw (8) and the contact surface of the wheel disc are engaged and fixed with the countersunk head face teeth (14) corresponding to the countersunk hole (13) of the tie rod nut of the 1 st stage wheel disc of the compressor in a face tooth (12) mode.

6. The tie bolt fastening device of a gas turbine disk tie rod combined rotor according to claim 5, characterized in that the face teeth (12) are rectangular face teeth (15), triangular face teeth (16) or trapezoidal face teeth (17).

7. The tie bolt fastening device of a combined rotor of tie rods for a gas turbine disk according to claim 5, characterized in that the engaging interface of the face teeth (12) of the tie bolt (8) is a face tooth (20) of a vertical plane perpendicular to the axial direction.

8. The tie bolt fastening device of a gas turbine disk tie rod combined rotor according to claim 5, characterized in that the engagement interface of the tie rod screw (8) face teeth (12) adopts conical face teeth (21) with a set angle.

Technical Field

The invention relates to a tie rod bolt fastening device of a gas turbine rotor, in particular to a tie rod bolt fastening device of a tie rod combined rotor of a gas turbine wheel disc.

Background

The heavy-duty gas turbine usually adopts a wheel disc pull rod combined rotor structure, and the wheel disc pull rod combined rotor has the characteristics of light weight, high rigidity, high strength and the like. After each stage of wheel discs are independently processed and manufactured, pull rod bolts are used for being fastened in series step by step, the structural strength requirement of the pull rod bolts playing a fastening role is high, and at present, the pull rod bolts of the heavy-duty gas turbine are mostly fastened and connected by threads at two ends and nuts. The gas turbine wheel disc and pull rod combined rotor adopts a vertical mode during assembly, pull rod bolts penetrate through wheel disc pull rod holes at all levels, after the wheel discs at all levels are assembled for one time gradually, a stretcher is adopted to stretch each pull rod bolt to a designed stretching length, then nuts at stretching ends are screwed down, each pull rod bolt is guaranteed to have certain pre-tightening force, and the wheel discs at all levels are enabled to keep a fastening state under the action of the pre-tightening force to form the whole rotor.

The combined rotor draw-bar bolt of gas turbine rim plate pull rod adopts the structure that both ends all have threaded connection at present, adopt the mode of mark to carry out the nut and screw the position location at left side spindle nose, there is the location inaccuracy, there is the homogeneity of a plurality of bolt pretightning forces of error influence circumference equipartition in nut screw in distance measurement, the contact surface of nut and rim plate adopts the pattern of plane contact in addition, along with the rising of rotor rotational speed, the nut wholly squints to the circumference outside direction with the pull-bar bolt easily, and arouse pull-bar bolt and rim plate pull rod hole inner wall at different levels to form the contact, cause the extra contact stress of pull-bar bolt, influence the security and the reliability of pull-bar bolt.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a tie rod bolt fastening device of a combined tie rod rotor of a gas turbine wheel disc.

In order to achieve the purpose, the invention adopts the following technical scheme:

a pull rod bolt fastening device of a wheel disc pull rod combined rotor of a gas turbine comprises a left shaft head, a compressor wheel disc, an intermediate shaft, a turbine wheel disc and a right shaft head which are coaxially and sequentially connected; the gas compressor wheel disc, the intermediate shaft and the turbine wheel disc are circumferentially and uniformly provided with a plurality of pull rod holes, the gas compressor wheel discs at all levels are connected in series and are fastened and connected by a plurality of pull rod bolts, the turbine wheel discs at all levels are connected in series and are fastened and connected by a plurality of pull rod bolts, and the gas compressor section and the turbine section are fastened and connected by the intermediate shaft and the bolts.

The invention is further improved in that the pull rod bolt adopts a screw and nut combination mode, the threaded end of the pull rod bolt penetrates through each pull rod hole of the left shaft head, the threaded end is arranged on the left side of the compressor section, the threaded end is arranged on the right side of the compressor section, and the nut is in threaded connection with the threaded end of the pull rod bolt.

The invention has the further improvement that the pull rod hole adopts a counter bore mode, and the nut of the pull rod bolt sinks into the counter bore of the nut.

The invention is further improved in that the upper surface of the screw of the pull rod bolt adopts a flat nut or a spherical nut.

The invention has the further improvement that the contact surface of the pull rod screw and the wheel disc is engaged and fixed with the countersunk head end face teeth corresponding to the countersunk holes of the pull rod nut of the 1 st-level wheel disc of the compressor in an end face tooth mode.

The invention is further improved in that the face teeth are rectangular face teeth, triangular face teeth or trapezoidal face teeth.

The invention is further improved in that the occlusion interface of the pull rod screw face teeth adopts face teeth of a vertical plane which is vertical to the axial direction.

The invention is further improved in that the occlusion interface of the pull rod screw face teeth adopts conical face teeth with a set angle.

Compared with the prior art, the invention has at least the following technical effects:

the pull rod bolt fastening device of the gas turbine wheel disc pull rod combined rotor, provided by the invention, is improved into a screw structure with an integrated nut and screw by utilizing the nut type at one end of the pull rod bolt, so that the pull rod bolt is convenient to install.

Furthermore, the assembling contact surface of the screw and the wheel disc is designed into a face tooth structure, and the face tooth can adopt various forms such as rectangular face tooth, triangular face tooth and trapezoidal face tooth and is used for transmitting torque; the other end of the pull rod bolt is fastened with the nut in a threaded mode, the nut is screwed after the pull rod bolt is stretched to the stretching length required by the design pretightening force by the stretcher, and the wheel discs at all levels are ensured to be tightly matched to form the whole rotor.

In conclusion, the pull rod bolt fastening device for the wheel disc pull rod combined rotor of the gas turbine solves the problems that when two ends of a pull rod bolt are connected with a nut through threads, the pull rod bolt penetrates from an air inlet end and is not accurately installed and positioned, the pull rod bolt and the nut are prone to integrally shifting towards the circumferential outer side direction, and the like.

Drawings

FIG. 1 is a schematic cross-sectional view of a gas turbine wheel and tie rod combined rotor;

FIG. 2 is a schematic view of a stay bolt fastening arrangement for a screw having face teeth at one end;

FIG. 3 is a schematic view of the vertical assembly of the wheel disc and tie rod combined rotor;

FIG. 4 is a schematic structural view of a tie-rod bolt end face tooth; wherein FIG. 4(a) is a front view and FIG. 4(b) is an isometric view;

FIG. 5 is a schematic structural view of a counter bore and counter bore end face teeth of a pull rod nut of a left spindle head wheel disc;

FIGS. 6 (a) - (c) are schematic views of the structures of the rectangular face teeth, the triangular face teeth and the trapezoidal face teeth;

FIG. 7 is a schematic structural view of the outer end face of a flat tie-bolt with rounded tie-rods;

FIG. 8 is a schematic view of a vertical plane face tooth configuration;

FIG. 9 is a schematic view of a conical face tooth mating surface configuration.

Description of reference numerals:

1. a left spindle nose; 2. a right spindle nose; 3. a compressor wheel disc; 4. an intermediate shaft; 5. a turbine wheel disc; 6. a draw bar bolt; 7. a draw bar hole; 8. a screw; 9. a nut; 10. an assembly table; 11. a stretcher; 12. end face teeth; 13. a nut counter bore; 14. end face teeth of the counter bore; 15. rectangular end face teeth; 16. triangular end face teeth; 17. trapezoidal end face teeth; 18. a flat nut; 19. a spherical nut; 20. vertical plane end face teeth; 21. conical surface end face teeth.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the invention provides a tie rod bolt fastening device for a tie rod combined rotor of a gas turbine wheel disc, the tie rod combined rotor of the gas turbine wheel disc consists of a left shaft head 1, a right shaft head 2, a compressor wheel disc 3, an intermediate shaft 4, a turbine wheel disc 5 and a plurality of tie rod bolts 6 which are uniformly distributed in the circumferential direction, a plurality of tie rod holes 7 are uniformly distributed in the circumferential direction on the compressor wheel disc 3, the intermediate shaft 4 and the turbine wheel disc 5, the compressor wheel discs 3 at all levels are connected in series and are fastened and connected by a plurality of tie rod bolts 6, the turbine wheel discs 5 at all levels are also connected in series and are fastened and connected by a plurality of tie rod bolts 6, and a compressor section and a turbine section are fastened and connected by an intermediate shaft and bolts.

Referring to fig. 2 and 3, the stay bolt 6 is formed by combining a bolt 8 and a nut 9, the stay bolt 6 penetrates into each stay hole 7 of the left shaft head, the screw end is arranged at the left side (air inlet end) of the compressor, the thread end is arranged at the right side (air outlet end) of the compressor, the left shaft head 1 is vertically fixed on an assembly table 10, each stage of compressor wheel disc 3 of the rotor is vertically and centrally installed, finally, each stay bolt is stretched to the designed stretching length by a stretcher 11, and then the nut 9 at the air outlet end of the stay bolt 6 is screwed.

Referring to fig. 4 and 5, the contact surface of the screw 8 of the tie bolt 6 and the wheel disc is engaged and fixed with the counterbore end face teeth 14 corresponding to the counterbore 13 of the tie nut of the 1 st-stage wheel disc of the compressor in a way of end face teeth 12.

Referring to fig. 1 and 5, the assembly surfaces of the first-stage wheel disc and the last-stage wheel disc and the pull rod bolt adopt a counter bore mode, and the pull rod bolt nut sinks into a nut counter bore 13 of the wheel disc pull rod.

Referring to fig. 6, the face teeth 12 may take various forms such as rectangular face teeth 15, triangular face teeth 16, and trapezoidal face teeth 17.

Referring to fig. 7 and 8, the outer surface of the screw 8 of the stay bolt 6 can adopt various types such as a flat nut 18, a spherical nut 19 and the like.

Referring to fig. 8 and 9, the engagement interface of the face teeth 12 of the tie rod screw 6 may be vertical face teeth 20 perpendicular to the axial direction, or may be conical face teeth 21 having a predetermined angle.