A damping shroud rotating cascade with adjustable pre-deformation amplitude

Abstract

The present invention discloses a damping shroud rotating blade with adjustable pre-deformation amplitude, belonging to the field of fluid machinery and vibration measurement technology, comprising a blade rotating shaft, a connecting disc, a blade, a shroud simulation part, and a simulation part pre-deformation adjustment unit, wherein the connecting disc is fixedly mounted on the outer circumference of the blade rotating shaft, a plurality of dovetail grooves are evenly arranged on the circumferential surface of the connecting disc, the bottom of the blade is mounted in the dovetail groove, and the top of the blade is placed on the bottom of the shroud simulation part, and the simulation part pre-deformation adjustment unit comprises a rotating unit that passes through the upper and lower parts of the shroud simulation part, a brake unit located on the upper part of the simulation part, and a plurality of rotation transfer units between the upper and lower surfaces of the simulation part. When in use, the brake unit is released, and when the rotation transfer unit is driven by the rotating unit to re-enter the next or several corresponding rotation transfer unit installation positions, the brake unit is re-locked to easily achieve the pre-deformation of the damping shroud rotating blade.

Description

Technical Field

[0001] The present invention belongs to the technical field of fluid machinery and vibration measurement, and more particularly relates to a damping shroud rotating blade with adjustable pre-deformation amplitude. Background Art

[0002] Deep peak shaving is a thermal power unit operating mode that adjusts output beyond the basic peak-shaving range to adapt to peak-to-valley variations in grid load. The load factor typically ranges from 40% to 30%. However, deep peak shaving can have many adverse effects on turbine blades, primarily manifesting in the following ways: It can cause cyclical fluctuations in turbine cylinder temperature and temperature differential, leading to low-cycle fatigue and damage to sealing components, reducing turbine life and safety; it can subject low-pressure last-stage rotor blades to water erosion and flutter, increasing blade stress and wear, potentially leading to blade breakage or loss; and it can deteriorate economic indicators such as the turbine's heat rate and power coal consumption rate, reducing the unit's economic benefits.

[0003] Steam turbine blades are key components that convert steam's thermal energy into mechanical energy. Operating under high temperature, high pressure, and high rotational speeds, they are subject to a variety of complex loads, including centrifugal force, steam flow forces, thermal stresses, corrosion, and erosion. The quality of blade operation directly impacts the performance, efficiency, and lifespan of the turbine. Measuring blade vibration can promptly detect blade damage and failures, ensuring stable turbine operation and safety. However, this measurement is currently only possible through non-contact methods. Non-contact blade vibration measurement technology has significant practical value. It can monitor the complex loads, such as centrifugal force, steam flow forces, thermal stresses, corrosion, and erosion, that blades experience under these conditions. This allows for the timely detection and resolution of blade anomalies, preventing serious consequences.

[0004] However, during the above simulation test process, the blades are usually required to reach the designed deformation amplitude. Therefore, how to design and develop a damping shroud rotating blade with adjustable deformation amplitude to simulate various blade vibrations, excitation, water erosion, cracks and other phenomena is an urgent problem to be solved. Summary of the Invention

[0005] The purpose of the present invention is to provide a damping shroud rotating blade cascade with adjustable pre-deformation amplitude, so as to meet the experimental requirements of blade vibration measurement, blade blasting, etc. under different vacuum degrees and rotation speeds and different blade and shroud structural characteristics.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A damping shroud rotating blade with adjustable pre-deformation amplitude, comprising a blade rotating shaft, a connecting disk, a blade, a shroud simulation member, and a simulation member pre-deformation adjustment unit, wherein the connecting disk is mounted and fixed on the outer circumferential surface of the blade rotating shaft, and a plurality of dovetail grooves are evenly arranged on the circumferential surface of the connecting disk, and the shroud simulation member comprises an upper isosceles polygon mounting plate and a lower annular support plate, wherein the lower annular support plate is mounted at the center of the lower surface of the upper isosceles polygon mounting plate, and the bottom of the blade is mounted in the dovetail groove, and the bottom surface of the lower annular support plate has a pair of parallel spaced protruding ribs, and the top of the blade is placed between the ribs and fixed by a tapered pin;

[0008] Wherein, the simulation part pre-deformation adjustment unit includes a rotation unit, a plurality of rotation transmission units and a brake unit. The rotation unit is installed at the center of the upper surface of the lower annular support plate and is rotatably connected with the inner surface of the upper isosceles polygonal mounting plate. The plurality of rotation transmission units are evenly installed between the lower surface of the upper isosceles polygonal mounting plate and the upper surface of the annular edge of the lower annular support plate, and are used to transmit the rotation action of the rotation unit.

[0009] The brake unit includes a round nut and a stop washer, which are sequentially mounted on the upper surface of the upper isosceles polygonal mounting plate. The inner surface of the round nut is rotatably connected to the circumferential outer surface of the rotating unit that passes through the upper isosceles polygonal mounting plate.

[0010] According to one embodiment of the present invention, the rotating unit is a vertical rotating shaft, the rotating transmission unit is a ball, the ball is installed in a spherical groove, and the spherical groove is composed of a one-to-one corresponding hemispherical groove between the lower surface of the upper isosceles polygonal mounting plate and the upper surface of the annular edge of the lower annular support plate.

[0011] According to one embodiment of the present invention, the number of the rotation transfer units is 6-16.

[0012] According to one embodiment of the present invention, the number of the blades and the number of the shroud simulation parts are both 50-100.

[0013] According to one embodiment of the present invention, a plurality of the belt simulation members are connected to each other in a front-to-back staggered manner through a pair of parallel waist edges in the upper isosceles polygonal mounting plate thereof, and the staggered connection is used to generate a pulse signal when an external sensor performs vibration measurement.

[0014] According to one embodiment of the present invention, the length of the staggered connection is 1 / 16-1 / 4 of the waist edge.

[0015] According to one embodiment of the present invention, the blade gradually widens from one end close to the dovetail groove toward one end of the belt simulation part, and the blade is used to be pre-deformed and twisted 5-30 degrees before being fixed to the rib plate, thereby forming an interlocking tightening force between multiple belt simulation parts to increase the overall rigidity of the rotating blade grid.

[0016] According to one embodiment of the present invention, a pair of coaxial annular metal cover plates are symmetrically installed on the front and rear rotating surfaces of the connecting disk, and the surface of the annular metal cover plates has screws that penetrate the pair of annular metal cover plates along the axial direction of the connecting disk, and the screws are used to fix the bottom of the blade.

[0017] According to one embodiment of the present invention, a plurality of through holes are evenly opened on the circumferential surface of the annular metal cover, and the plurality of through holes are used to adjust the rotation balance of the connecting disk.

[0018] In general, the above technical solutions conceived by the present invention have the following technical advantages compared with the existing technology:

[0019] 1. In the simulation part pre-deformation adjustment unit of the present invention, the rotation unit at the bottom and the brake unit at the top are used to control the rotation and braking of the lower part of the simulation part in the axial direction, and the multiple rotation transfer units in the middle are installed between the upper and lower surfaces of the upper and lower parts of the simulation part, for receiving and transmitting the rotation movement of the rotation unit. Therefore, when the brake unit is released, the lower annular support plate can be rotated by a certain angle relative to the upper isosceles polygon mounting plate through the rotation unit. When the rotation transfer unit completely enters the next or several corresponding rotation transfer unit installation positions, the brake unit can be locked to easily achieve the pre-deformation of the damping belt rotating blade.

[0020] 2. The preferred number of rotation transfer units of the present invention can meet the expected design of most deformation amplitudes.

[0021] 3. The plurality of belt simulation members of the present invention are staggeredly connected to each other, and can generate a pulse signal when an external sensor performs vibration measurement, thereby facilitating non-contact sensing measurement technology.

[0022] 4. The preferred blades of the present invention gradually widen from bottom to top and are twisted at a certain angle, thereby strengthening the interlocking force between the multiple shroud simulation parts and the overall rigidity of the rotating blade grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional diagram of the damping shroud rotating blade cascade with adjustable pre-deformation amplitude provided by the present invention.

[0024] Figure 2 A three-dimensional cross-sectional view of the damping shroud rotating blade grid with adjustable pre-deformation amplitude provided by the present invention.

[0025] Figure 3 A three-dimensional diagram of the connecting disk of the damping shroud rotating blade grid with adjustable pre-deformation amplitude provided by the present invention.

[0026] Figure 4 A three-dimensional diagram of the annular metal cover plate of the damping shroud rotating blade with adjustable pre-deformation amplitude provided by the present invention.

[0027] Figure 5 Schematic diagram of the torsion of the damping shroud rotating cascade blades with adjustable pre-deformation amplitude provided by the present invention.

[0028] Figure 6 A three-dimensional diagram of the shroud blades of the damping shroud rotating cascade with adjustable pre-deformation amplitude provided by the present invention.

[0029] Figure 7 A three-dimensional diagram of a simulation component of a damping shroud rotating blade cascade shroud with adjustable pre-deformation amplitude provided by the present invention.

[0030] Figure 8 A three-dimensional cross-sectional view of a simulation component of a damping shroud rotating blade cascade shroud with adjustable pre-deformation amplitude provided by the present invention.

[0031] Figure 9 A three-dimensional diagram of the isosceles polygonal mounting plate on the upper portion of the damping shroud rotating blade cascade with adjustable pre-deformation amplitude provided by the present invention.

[0032] Figure 10 A three-dimensional diagram of the lower annular support plate of the damping shroud rotating blade cascade with adjustable pre-deformation amplitude provided by the present invention.

[0033] Reference numerals: upper isosceles polygonal mounting plate 1, lower annular support plate 2, blade 3, connecting plate 4, annular metal cover plate 5, screw 6, round nut 7, retaining washer 8, ball 9, tapered pin 10. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0035] like Figures 1 to 10As shown, a damping shroud rotating blade with adjustable pre-deformation amplitude provided by this embodiment includes an upper isosceles polygonal mounting plate 1, a lower annular support plate 2, blades 3, a connecting plate 4 and an annular metal cover plate 5, screws 6, round nuts 7, retaining washers 8, balls 9 and tapered pins 10. The connection method and structure of each component will be described in detail below.

[0036] In this embodiment, the blades 3 are straight blades that are narrow at the top and wide at the bottom. Each blade is pre-deformed and twisted 15-30 degrees during installation and then fastened to the lower annular support plate 2 through a tapered pin, thereby forming an interlocking tightening force between the shrouds and increasing the overall rigidity of the blade grid.

[0037] In this embodiment, the blades 2 are installed in the dovetail grooves on the circumferential surface of the connecting plate 4 and are encapsulated and fixed by screws 6 that pass through the circumferential edges of two annular metal cover plates 5.

[0038] In this embodiment, the connecting plate 3 is positioned by a conical surface and is detachably mounted on the blade rotating shaft using a plurality of bolts (not specifically shown in the figure).

[0039] In this embodiment, the balls 9 are placed in several spherical grooves composed of the hemispherical grooves in the upper and lower parts of the belt simulation component. The vertical rotating axis of the lower annular support plate 2 passes through the circular through hole of the upper isosceles polygonal mounting plate 1, and is then locked and fixed by the round nut 7 and the locking washer 8.

[0040] When adjusting the pre-deformation amplitude:

[0041] 1. Loosen the pin 10 and remove the blade 3;

[0042] 2. Loosen the round nut 7;

[0043] 3. Rotate the lower annular support plate 2 about the rotation axis relative to the upper isosceles polygonal mounting plate 1 by a certain angle until the hemispherical grooves in the upper and lower parts correspond to each other again;

[0044] 4. Tighten the round nut 7;

[0045] 5. Install the blades.

[0046] The pre-deformation of the damping shroud rotating blade can be achieved. The number of balls in this embodiment is 8. Figure 10 As shown, when the deformation amount of the pre-deformation needs to be further refined, the number of balls can be increased, for example, changed to 9-16, which can meet the needs of most deformation adjustment designs.

[0047] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A damping shroud rotating cascade with adjustable pre-deformation amplitude, characterized in that: It includes a blade rotating shaft, a connecting disk, a blade, a shroud simulation part and a simulation part pre-deformation adjustment unit, the connecting disk is mounted and fixed on the outer circumference of the blade rotating shaft, the circumferential surface of the connecting disk is evenly arranged with a plurality of dovetail grooves, the shroud simulation part includes an upper isosceles polygon mounting plate and a lower annular support plate, the lower annular support plate is mounted at the center of the lower surface of the upper isosceles polygon mounting plate, the bottom of the blade is mounted in the dovetail groove, the bottom surface of the lower annular support plate has a pair of parallel spaced protruding ribs, the top of the blade is placed between the ribs and is fixed by a tapered pin; Wherein, the simulation part pre-deformation adjustment unit includes a rotation unit, a plurality of rotation transmission units and a brake unit. The rotation unit is installed at the center of the upper surface of the lower annular support plate and is rotatably connected with the inner surface of the upper isosceles polygonal mounting plate. The plurality of rotation transmission units are evenly installed between the lower surface of the upper isosceles polygonal mounting plate and the upper surface of the annular edge of the lower annular support plate, and are used to transmit the rotation action of the rotation unit. The brake unit includes a round nut and a stop washer, which are sequentially mounted on the upper surface of the upper isosceles polygonal mounting plate. The inner surface of the round nut is rotatably connected to the circumferential outer surface of the rotating unit that passes through the upper isosceles polygonal mounting plate.

2. The damping shroud rotating blade with adjustable pre-deformation amplitude according to claim 1, characterized in that: The rotating unit is a vertical rotating shaft, and the rotating transmission unit is a ball. The ball is installed in a spherical groove. The spherical groove is composed of a one-to-one corresponding hemispherical groove between the lower surface of the upper isosceles polygonal mounting plate and the upper surface of the annular edge of the lower annular support plate.

3. The damping shroud rotating cascade with adjustable pre-deformation amplitude according to claim 1 or 2, characterized in that: The number of the rotation transfer units is 6-16.

4. The damping shroud rotating cascade with adjustable pre-deformation amplitude according to claim 1, characterized in that: The number of the blades and the number of the shroud simulation parts are both 50-100.

5. The damping shroud rotating blade cascade with adjustable pre-deformation amplitude according to claim 1 or 4, characterized in that: The plurality of belt simulation members are connected to each other in a front-to-back staggered manner through a pair of parallel waist edges in the upper isosceles polygonal mounting plate thereof. The staggered connection is used to generate a pulse signal when an external sensor performs vibration measurement.

6. The damping shroud rotating cascade with adjustable pre-deformation amplitude according to claim 5, characterized in that: The length of the staggered connection is 1 / 16-1 / 4 of the waist edge.

7. The damping shroud rotating cascade with adjustable pre-deformation amplitude according to claim 1, characterized in that: The blade gradually widens from one end close to the dovetail groove toward one end of the belt simulation part. The blade is used to pre-deform and twist 5-30 degrees before being fixed to the rib plate, thereby forming an interlocking tightening force between multiple belt simulation parts to increase the overall rigidity of the rotating blade grid.

8. The damping shroud rotating cascade with adjustable pre-deformation amplitude according to claim 1, characterized in that: A pair of coaxial annular metal cover plates are symmetrically mounted on the front and rear rotating surfaces of the connecting disk. The circumferential edges of the pair of annular metal cover plates are provided with screws that penetrate axially along the connecting disk, and the screws are used to fix the bottom of the blade.

9. The damping shroud rotating cascade with adjustable pre-deformation amplitude according to claim 8, characterized in that: A plurality of through holes are evenly formed on the circumferential edge of the annular metal cover plate, and the plurality of through holes are used to adjust the rotation balance of the connecting disk.

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