A self-locking power turbine integrated output structure

Abstract

The present application provides a self-locking power turbine integrated output structure, which belongs to the field of gas turbine technology. The self-locking power turbine integrated output structure includes: a speed sensor fixedly connected to the bearing seat casing; a transmission flange that moves synchronously with the output shaft through a spline structure, the front end of the transmission flange is provided with a cantilevered speed measuring gear structure, and the speed measuring gear structure matches the speed sensor in the axial position; and a shaft end plug connected to the rear end of the transmission flange, through which the output shaft is blocked. The self-locking power turbine integrated output structure provided by the present application increases the internal space of the bearing seat casing by integrating the function of the speed measuring gear into the transmission flange, realizes a good layout space for the bearing and the sealing structure, and facilitates the disassembly and maintenance of the output shaft.

Description

Technical Field

[0001] The present application belongs to the technical field of gas turbines, and in particular relates to a self-locking power turbine integrated output structure. Background Art

[0002] like Figure 1 The figure shows a schematic diagram of the power turbine output structure of a certain type of gas turbine in the prior art. The speed sensor 11 for measuring the speed of the output shaft 12 is installed on the bearing housing 18. The speed measuring gear 111 on the output shaft 12 corresponding to the speed sensor 11 is a separate gear ring structure, which is installed on the output shaft 12 of the power turbine and locked by a locking nut 13. The rear end of the speed measuring gear 111 is installed in the transmission flange 14, and the transmission flange 14 is connected to the output shaft 12 of the power turbine through a spline 15. A bushing cover 16 is installed in the inner cavity of the output shaft 12 to achieve a tight sealing of the shaft cavity. Finally, a nut 17 is used to lock the transmission flange 14 and the bushing cover 16.

[0003] In the existing technical solution, the power turbine output structure is complex and has many assembly steps. Due to space layout limitations, the locking nut 13 and the speed measuring gear 111 occupy part of the internal space 19 of the bearing seat casing, and the arrangement of the fulcrum and the sealing structure is restricted. At the same time, the transmission flange 14 and the bushing cover 16 are locked by a structure in which a bent locking piece is set at the end of the bushing cover. It is easy to be damaged during maintenance and disassembly, and the bushing cover 16 needs to be replaced more frequently, which has a high maintenance cost. Summary of the Invention

[0004] The purpose of the present application is to provide a self-locking power turbine integrated output structure to solve or alleviate at least one problem in the background technology.

[0005] The technical solution of this application is: a self-locking power turbine integrated output structure, comprising:

[0006] A speed sensor fixedly connected to the bearing housing;

[0007] A transmission flange that moves synchronously with the output shaft through a spline structure, wherein a cantilevered speed measuring gear structure is provided at the front end of the transmission flange, and the speed measuring gear structure matches the speed sensor in axial position; and

[0008] A shaft end plugging cover is connected to the rear end of the transmission flange, and the output shaft is sealed by the shaft end plugging cover.

[0009] Furthermore, the speed sensor is connected to the bearing seat casing via bolts.

[0010] Furthermore, the spline structure is arranged on the inner side of the transmission flange, and is connected to the output shaft through the spline structure to achieve synchronous rotation with the output shaft.

[0011] Furthermore, the rear end of the transmission flange is provided with two groups of circumferentially evenly distributed threaded holes, and the two groups of circumferentially evenly distributed threaded holes are deflected by a predetermined angle.

[0012] Furthermore, each group has four circumferentially evenly distributed threaded holes.

[0013] Furthermore, the predetermined angle is 37.5 degrees.

[0014] Furthermore, the front end of the shaft end cover has an axially extending circular tube portion, the outer surface of the circular tube portion is provided with an external thread matching the output shaft, and the rear end of the shaft end cover has a radially extending circular portion, the edge of the circular portion is provided with a plurality of circumferentially evenly distributed petal grooves, and the shaft end cover is connected to the rear end of the transmission flange by bolts passing through the petal grooves.

[0015] Furthermore, an end cover clamping ring is provided on the outside of the shaft end plugging cover, and the end cover clamping ring forms a locking plate structure for locking the bolt.

[0016] Furthermore, the number of the petal grooves is an integer multiple of the circumferentially uniformly distributed threaded holes in each group.

[0017] Furthermore, the number of the petal slots is 16.

[0018] The self-locking power turbine integrated output structure provided by the present application increases the internal space of the bearing seat casing by integrating the function of the speed measuring gear into the transmission flange, thereby achieving a good layout space for the bearing and the sealing structure, and facilitating the disassembly and maintenance of the output shaft; the shaft end cover adopts a petal groove design, which meets the sealing of the output shaft cavity while having a circumferential self-locking function, and the rear end end cover clamping ring is locked with a locking plate. Each time maintenance and disassembly is performed, only the locking plate needs to be replaced, which reduces maintenance costs compared to the original plan where the bushing cover needs to be replaced for maintenance and disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions provided by this application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application.

[0020] Figure 1 This is a schematic diagram of the power turbine output structure in the prior art.

[0021] Figure 2 This is a schematic diagram of the power turbine integrated output structure of this application.

[0022] Figure 3 This is a schematic diagram of the transmission flange structure in this application.

[0023] Figure 4 This is a schematic diagram of the shaft end plugging cover structure in this application.

[0024] Figure 5and Figure 6 Schematic diagram of different angular assembly positions of the transmission flange and the shaft end cover A in this application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application.

[0026] In order to improve the internal space of the bearing seat casing and achieve a better layout of the bearings and sealing structure, and at the same time to facilitate the disassembly and maintenance of the speed measuring gear and the transmission flange and reduce the maintenance cost of the shaft end cover, the present application provides a self-locking power turbine integrated output structure.

[0027] like Figure 2 As shown, the self-locking power turbine integrated output structure 20 provided in the present application includes: a speed sensor 21, a bearing seat casing 22, an output shaft 23, a transmission flange 24, a shaft end plug 27, a plug clamping ring 28 and a bolt 29.

[0028] Among them, the speed sensor 21 is connected to the bearing seat casing 22 through bolts and other connecting parts, and is connected to the load-bearing casing (not shown) as a stator component. The load of the rotor is transmitted to the bearing seat casing 22 through the bearing (not shown), and then further transmitted to the load-bearing casing.

[0029] Combine Figure 2 and Figure 3 As shown, a cantilevered speed-measuring gear structure 26 is provided at the front end (i.e., the left side) of the transmission flange 24. This gear structure 26 axially corresponds to the speed sensor 21, thereby integrating the speed-measuring function into the transmission flange 24. This eliminates the speed-measuring gear and locking nut in the original structure, leaving ample space within the bearing housing casing 221. The rear end of the transmission flange 24 is circumferentially provided with two sets of circumferentially evenly distributed threaded holes 241 at different angular orientations. A spline structure 25 is provided on the inner side of the transmission flange 24, which is connected to the output shaft 23 via the spline structure 25, achieving synchronous rotation therewith.

[0030] Combine Figure 2 and Figure 4As shown, the front end (left side) of the shaft end cover 27 is an axially extending circular tube portion 271, the outer surface of the circular tube portion 271 is provided with a thread, and the rear end (right side) of the shaft end cover 27 is a radially extending circular portion, and a plurality of circumferentially uniformly distributed petal grooves 272 are provided on the edge of the circular portion. The shaft end cover 27 is connected to the rear end of the transmission flange 24 by means of bolts 29 passing through the gaps in the petal grooves 272 and the end cover clamping ring 28. While the petal grooves 272 play a circumferential positioning and self-locking function, they also cooperate with the circumferentially uniformly distributed threaded holes 241 at different angular directions at the rear end of the transmission flange 24 to realize the circumferential adjustment of the shaft end cover 27 at a smaller angle to meet the tightening torque of its assembly.

[0031] like Figure 5 and Figure 6 The figure shows an assembly diagram of the transmission flange 24 and the shaft end plug cover 27 in an embodiment of the present application. The circumferentially uniformly distributed threaded holes 241 set at the rear end of the transmission flange 24 are in a group of four, and there are two groups in total (the thin dotted line is one group, and the thick dotted line is one group). The angle α between the two groups is 37.5°. At the same time, there are 16 petal grooves 272 evenly distributed circumferentially in the shaft end plug cover 27. By setting two groups of circumferentially uniformly distributed threaded holes 241, the problem that the petal grooves 272 and the circumferentially uniformly distributed threaded holes 241 cannot be aligned within the tightening torque requirement range, which causes the bolts 29 to be unable to be assembled, can be solved.

[0032] During assembly, the circular tube portion 271 of the shaft end plug cover 27 is threadedly connected to the inner diameter of the output shaft 23, and the gap of the petal groove 272 is adjusted within the required range of the tightening torque so that it is aligned with one group of circumferentially uniformly distributed threaded holes 241. After assembling the end cover clamping ring 28, the bolts 29 are installed, and the connection between the transmission flange 24 and the output shaft 23 is achieved through the locking plate of the cover clamping ring 28.

[0033] The self-locking power turbine integrated output structure provided in the present application increases the internal space of the bearing seat casing 22 by integrating the function of the speed measuring gear into the transmission flange 24, thereby achieving a good layout space for the bearing and the sealing structure, and facilitating the disassembly and maintenance of the output shaft; the shaft end cover 27 adopts a petal groove design, which meets the sealing of the output shaft 23 shaft cavity while having a circumferential self-locking function, and the rear end end cover clamping ring 28 is locked with a locking plate. Each time maintenance and disassembly is performed, only the locking plate needs to be replaced, which reduces maintenance costs compared to the original solution that requires replacement of the bushing cover for maintenance and disassembly.

[0034] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A self-locking power turbine integrated output structure, characterized in that: include: A rotation speed sensor (11) fixedly connected to the bearing housing (22); a transmission flange (24) that moves synchronously with the output shaft (23) via a spline structure (25), a cantilevered speed measuring gear structure (26) being provided at the front end of the transmission flange (24), and the speed measuring gear structure (26) being matched with the speed sensor (21) in axial position; and A shaft end plugging cover (27) connected to the rear end of the transmission flange (24) is used to block the output shaft (23).

2. The self-locking power turbine integrated output structure according to claim 1, characterized in that: The rotation speed sensor (21) is connected to the bearing seat casing (22) via bolts.

3. The self-locking power turbine integrated output structure according to claim 1, characterized in that: The spline structure (25) is arranged on the inner side of the transmission flange (24) and is connected to the output shaft (23) through the spline structure (25) to achieve synchronous rotation with the output shaft (23).

4. The self-locking power turbine integrated output structure according to claim 1, characterized in that: The rear end of the transmission flange (24) is provided with two groups of circumferentially evenly distributed threaded holes (241), and the two groups of circumferentially evenly distributed threaded holes (241) are deflected at a predetermined angle.

5. The self-locking power turbine integrated output structure according to claim 4, characterized in that: Each group has four circumferentially evenly distributed threaded holes (241).

6. The self-locking power turbine integrated output structure according to claim 4, characterized in that: The predetermined angle is 37.5 degrees.

7. The self-locking power turbine integrated output structure according to any one of claims 4 to 6, characterized in that: The front end of the shaft end cover (27) has an axially extending circular tube portion (271), the outer surface of the circular tube portion (271) is provided with an external thread matching the output shaft (23), the rear end of the shaft end cover (27) has a radially extending circular portion, the edge of the circular portion is provided with a plurality of circumferentially evenly distributed petal grooves (272), and the shaft end cover (27) is connected to the rear end of the transmission flange (24) by means of bolts (29) passing through the petal grooves (272).

8. The self-locking power turbine integrated output structure according to claim 7, characterized in that: An end cover clamping ring (28) is provided on the outside of the shaft end plug cover (27), and the end cover clamping ring (28) forms a locking plate structure for locking the bolt (29).

9. The self-locking power turbine integrated output structure according to claim 7, characterized in that: The number of the petal grooves (272) is an integer multiple of the circumferentially uniformly distributed threaded holes (241) in each group.

10. The self-locking power turbine integrated output structure according to claim 9, characterized in that: The number of the petal grooves (272) is 16.

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