Water turbine guide vane middle sleeve pressing plate device capable of preventing bolt from being broken

Abstract

The utility model discloses a water turbine guide vane middle sleeve pressing plate device capable of preventing a bolt from being broken, which comprises a whole circular ring pressing plate (2) formed by combining two semicircular ring pressing plates (1), the whole circular ring pressing plate (2) is provided with fixing bolt holes (3) which are uniformly distributed and staggered with a splicing sectioning line of the two semicircular ring pressing plates (1), and each semicircular ring pressing plate (1) is provided with four fixing bolt holes (3). Fixing bolt holes (3) are formed in the two semicircular pressing plates (1), the fixing bolt holes (3) in the two semicircular pressing plates (1) are symmetrically formed relative to a splicing sectioning line, detachable fixing bolts (4) are arranged in the fixing bolt holes (3), four sets of limiting grooves (5) which are evenly distributed are formed in the outer edge of the whole circular pressing plate (2), the transverse sections of the limiting grooves (5) are semicircular, and special pins (6) for supporting the whole circular pressing plate (2) in the radial direction are arranged on one sides of the limiting grooves (5). Horizontal shearing force borne by the fixing bolts can be reduced, and the situation that the pressing plate bolts are broken is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a water turbine guide vane middle sleeve, especially a water turbine guide vane middle sleeve pressing plate device of preventing bolt fracture. BACKGROUND

[0002] The water turbine guide vane mechanism is composed of a series of components such as movable guide vanes, guide vane transmission mechanisms, top covers, bottom rings, control rings and the like, is an important part of controlling the direction and size of water flow into the unit, and mainly functions to form and change the circulation of water flow into the runner, to ensure that the water turbine has good hydraulic characteristics, and plays a decisive role in the long-term stability, safety and efficient operation of the entire unit. Each movable guide vane is provided with upper, middle and lower shaft sleeves as fulcrums for support, and the lower shaft sleeve generally adopts an independent sleeve structure, while the current main types of water turbine guide vane upper and middle sleeve structures are as follows: 1. The guide vane middle shaft sleeve and the upper shaft sleeve sleeve are designed in a separated manner, the water turbine guide vane middle sleeve is fixed to the top cover through a pressing plate device to prevent the middle sleeve from rotating with the movable guide vane shaft neck and damaging the seal to cause water leakage; and 2. The guide vane middle shaft sleeve and the upper shaft sleeve sleeve are integrated into a whole sleeve structure, and the specification and number of the bolts for connecting the whole sleeve to the top cover can be obviously greater than those of the separated middle shaft sleeve and the top cover, which can effectively avoid the problem of bolt fracture of the separated middle shaft sleeve pressing plate and prevent water leakage of the guide vane middle shaft sleeve.

[0003] The separated guide vane middle sleeve structure has the advantages of simple manufacturing and low cost, but also has a major drawback, that is, the separated guide vane middle sleeve is prone to bolt fracture of the pressing plate due to the hydraulic effect, which causes the middle sleeve to be pushed out by the water flow, a large amount of water leakage at the guide vane middle shaft sleeve, and the risk of water flooding the foundation pit due to water seepage at the water turbine unit middle shaft sleeve, and the risk of water flooding the plant due to a large amount of water leakage at two or more middle shaft sleeves, which seriously affects the safe and stable operation of the unit. SUMMARY

[0004] The utility model aims to provide a water turbine guide vane middle sleeve pressing plate device that can prevent bolt fracture. It can reduce the horizontal shear force on the fixing bolts and avoid bolt fracture of the pressing plate.

[0005] The utility model discloses a technical scheme: a water turbine guide vane middle sleeve pressing plate device of preventing bolt fracture, including the whole circular ring pressing plate that is combined by two half circular ring pressing plates, and the fixed bolt hole that is evenly distributed and is set with two half circular ring pressing plate spliced parting line dislocation is equipped on the whole circular ring pressing plate, is equipped with 4 fixed bolt holes on every half circular ring pressing plate, and the fixed bolt hole on two half circular ring pressing plates is set up with spliced parting line symmetry, and the detachable fixed bolt is equipped in the fixed bolt hole, and the outer edge of the whole circular ring pressing plate is equipped with 4 groups of evenly distributed and horizontal section is half circular's limiting slot, and the limiting slot is located in the middle of adjacent fixed bolt hole and is set with the limiting slot and spliced parting line dislocation, and one side of the limiting slot is equipped with the special pin that supports the whole circular ring pressing plate radially.

[0006] In the foregoing water turbine guide vane middle sleeve pressing plate device of preventing bolt fracture, the half circular ring pressing plate is inverted L-shaped in cross section.

[0007] In the foregoing water turbine guide vane middle sleeve pressing plate device of preventing bolt fracture, the special pin includes a cylindrical portion and a fan-shaped portion disposed on the lower side of the cylindrical portion, an upper end of the cylindrical portion and an upper end of the fan-shaped portion are provided with a circular arc chamfer, and a lower edge of the fan-shaped portion is provided with a welding groove.

[0008] In the foregoing water turbine guide vane middle sleeve pressing plate device of preventing bolt fracture, the fixed bolt is an M16*110 half-thread 8.8-grade high-strength bolt.

[0009] Compared with the prior art, the utility model can greatly improve the operation reliability of the guide vane middle sleeve structure, reduce the unplanned shutdown of the unit caused by water seepage of the middle shaft sleeve, ensure the safe and stable operation of the hydroelectric generating set, and facilitate disassembly and assembly, and reduce the disassembly and assembly workload. BRIEF DESCRIPTION OF DRAWINGS

[0010] Fig. 1 is the structural schematic diagram of the utility model;

[0011] Fig. 2 is the structural schematic diagram of the special pin of the utility model.

[0012] The marks in the drawings are: 1-half circular ring pressing plate, 2-whole circular ring pressing plate, 3-fixed bolt hole, 4-fixed bolt, 5-limiting slot, 6-special pin, 7-cylindrical portion, 8-fan-shaped portion, 9-circular arc chamfer, and 10-welding groove. DETAILED DESCRIPTION

[0013] The utility model will be further described below in combination with the drawings and examples, but not as the basis for limiting the utility model.

[0014] Example. A water turbine guide vane middle sleeve pressing plate device of preventing bolt fracture, constitutes as follows Figs. 1-2As shown, the whole circular ring pressing plate 2 is combined by two half circular ring pressing plates 1, the fixing bolt holes 3 are uniformly distributed on the whole circular ring pressing plate 2 and are arranged in dislocation with the splicing and partition line of the two half circular ring pressing plates 1, four fixing bolt holes 3 are arranged on each half circular ring pressing plate 1, the fixing bolt holes 3 on the two half circular ring pressing plates 1 are symmetrically arranged along the splicing and partition line, the fixing bolt holes 3 are provided with detachable fixing bolts 4, the outer edge of the whole circular ring pressing plate 2 is provided with four groups of limiting grooves 5 which are uniformly distributed and have a half circular cross section in the horizontal direction, the limiting grooves 5 are located in the middle of the adjacent fixing bolt holes 3 and are arranged in dislocation with the splicing and partition line, and one side of the limiting grooves 5 is provided with special pins 6 which support the whole circular ring pressing plate 2 in the radial direction.

[0015] The half circular ring pressing plate 1 has an inverted L-shaped cross section.

[0016] The special pin 6 includes a columnar portion 7 and a fan-shaped portion 8 arranged at the lower side of the columnar portion 7, a circular arc chamfer 9 is arranged at the upper end of the columnar portion 7 and the upper end of the fan-shaped portion 8, and a welding bevel 10 is arranged at the lower side edge of the fan-shaped portion 8.

[0017] The fixing bolt 4 is an M16*110 half thread 8.8 grade high-strength bolt.

[0018] The utility model discloses a principle: whole circular ring pressing plate 2 is by two groups of half circular ring pressing plate 1 is formed, and half circular ring pressing plate uses the 45 high-quality carbon structural steel of higher strength than ordinary steel, and the deformation resistance is stronger, and the inner diameter of half circular pressing plate is consistent with the outer diameter of guide vane middle sleeve, and is closely matched with the fixed pressing plate groove of guide vane middle sleeve body. The longitudinal section of two groups of half circular ring pressing plate 1 is inverted L shape, and whole circular ring pressing plate 2 is equipped with the fixed bolt hole 3 of even distribution and with two half circular ring pressing plate 1 splicing split piece line dislocation setting, is equipped with 4 fixed bolt holes 3 on each half circular ring pressing plate 1, and the fixed bolt hole 3 on two half circular ring pressing plates 1 is set up symmetrically with splicing split piece line, and is equipped with limiting groove 5 between first and second, third and fourth fixed bolt holes 3 on half circular ring pressing plate 1, and limiting groove 5 is half circular groove with 30 millimeters diameter. One side of limiting groove 5 is equipped with special pin 6, and special pin is the integral irregular structure of cylindrical plus sector, uses the 45 high-quality carbon structural steel, and is shaped by numerical control integral processing, and is non-welding assembly structure, and the structural strength is high. The diameter of columnar portion 7 is consistent with limiting groove 5, is 30 millimeters, and is closely fitted with limiting groove 5, and the setting of circular arc chamfer 9 can be taken out in the vertical direction both pressing plate and guide vane middle sleeve in the installation and overhaul stage, also avoid stress concentration in the use stage, increase structural stability. The lower edge of sector portion 8 is equipped with welding bevel 10, can increase the welding area of special pin and top cover, and increase the stability of special pin after welding. When unit overhauls, after removing the fixed bolt of pressing plate 8, pressing plate and guide vane middle sleeve can be taken out in the vertical direction, need not cut off the four special pins welded on the top cover, convenient to use, do not increase the overhaul workload. The application can overhaul the fixed bolt fracture risk, and is convenient to disassemble, and will not increase the overhaul efficiency.

Claims

1. A device for preventing bolt breakage in the sleeve pressure plate of a turbine guide vane, characterized in that: The application relates to a whole circular ring pressing plate (2) which is composed of two half circular ring pressing plates (1), wherein the whole circular ring pressing plate (2) is provided with uniformly distributed fixing bolt holes (3) which are arranged in a dislocation mode with respect to the splicing and split line of the two half circular ring pressing plates (1); each half circular ring pressing plate (1) is provided with four fixing bolt holes (3), and the fixing bolt holes (3) on the two half circular ring pressing plates (1) are symmetrically arranged along the splicing and split line; the fixing bolt holes (3) are provided with detachable fixing bolts (4); the outer edge of the whole circular ring pressing plate (2) is provided with four groups of limiting grooves (5) which are uniformly distributed and have a half circular transverse section; the limiting grooves (5) are located in the middle of adjacent fixing bolt holes (3) and are arranged in a dislocation mode with respect to the splicing and split line; and one side of the limiting grooves (5) is provided with special pins (6) which support the whole circular ring pressing plate (2) in a radial direction.

2. A sleeve plate device for preventing bolt breakage in a guide vane of a hydraulic turbine according to claim 1, characterized in that: The half circular ring pressing plate (1) has an inverted L-shaped cross section.

3. A sleeve plate device for preventing bolt breakage in a guide vane of a hydraulic turbine according to claim 1, characterized in that: The special pin (6) comprises a columnar portion (7) and a fan-shaped portion (8) arranged at the lower side of the columnar portion (7); the upper end of the columnar portion (7) and the upper end of the fan-shaped portion (8) are provided with a circular arc chamfer (9); and the lower side edge of the fan-shaped portion (8) is provided with a welding bevel (10).

4. The sleeve plate device for preventing bolt breakage in the guide vane of a hydraulic turbine according to claim 1, characterized in that: The fixing bolt (4) is an M16*110 half thread 8.8 grade high-strength bolt.

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