Anti-corrosion composite blade of steam turbine

Abstract

The utility model provides an anti-corrosion composite blade of a steam turbine, which relates to the technical field of steam turbine blades and comprises a steam turbine blade body, the steam turbine blade body mainly comprises a blade body, a blade top and a blade root, a martensitic steel inner layer is arranged on the inner side of the blade body, and an anti-corrosion fiber outer layer is compounded on the outer side face of the martensitic steel inner layer. A composite back arc piece is attached to the groove face of the back of the blade body, the upper end of the composite back arc piece is attached to the blade top through the arc piece top end, the lower end of the composite back arc piece is attached to the blade root through the base end, and the blade top is in threaded connection with the arc piece top end through a positioning stud. The utility model solves the problem that the back cambered surface of the blade in the prior art is frequently impacted by water drops, so that an anticorrosive coating coated at the back cambered surface is more easily damaged, and the overall service life of the turbine blade is influenced.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam turbine blade technical field, concretely relates to a steam turbine anticorrosion composite blade. BACKGROUND

[0002] Steel for turbin blade is the general term of steel for turbine blade and static blade in steam turbine. Blade is the key part of steam turbine, and is one of the most delicate and important parts. Its aerodynamic performance, processing geometry, surface roughness, installation gap, running condition and fouling affect the efficiency and output of steam turbine. Its structural design, vibration strength and running mode have a decisive influence on the safety and reliability of the unit. Through research, the prior art (publication number: CN202123196621.6) discloses an anticorrosion blade for steam turbine. The outer side of the installation bottom plate of the blade body is coated with a corrosion-resistant layer and a rust-proof layer. When the blade body is used for a long time, corrosion and rust are avoided, the service life is prolonged, and a high-temperature resistant coating is arranged on the outermost side to avoid the warping of the corrosion-resistant layer and the rust-proof layer caused by high temperature during the operation of the steam turbine. A protective strip is fixedly installed around the edge of the blade body to avoid edge wear caused by thin coating on the edge. SUMMARY

[0003] In order to overcome the defects of the prior art, the steam turbine anticorrosion composite blade is provided to solve the problem that the back camber surface of the blade is frequently impacted by water droplets, which causes the corrosion-resistant layer coated thereon to be damaged more easily and affects the overall service life of the steam turbine blade.

[0004] To achieve the above-mentioned purpose, a steam turbine anticorrosion composite blade is provided, which comprises: a steam turbine blade body, the steam turbine blade body mainly comprising a blade body, a blade tip and a blade root,

[0005] The inside of the blade body is provided with a martensitic steel inner layer, the outer side of the martensitic steel inner layer is compounded with an anticorrosion fiber outer layer, a composite back camber piece is attached to the back groove surface of the blade body, the upper end of the composite back camber piece is attached to the blade tip through the camber piece top end, the lower end of the composite back camber piece is attached to the blade root through the base end, and the blade tip is screwed with the camber piece top end through positioning studs.

[0006] Further, the blade tip is welded on the upper end of the blade body, and the blade root is welded on the lower end of the blade body.

[0007] Further, the anticorrosion fiber outer layer is fixedly attached to the side surface of the blade body in a honeycomb net shape.

[0008] Further, the leaf top is internally provided with a positioning screw hole; and a positioning stud is embedded and screwed in the positioning screw hole.

[0009] Further, the positioning stud is vertically screwed at the arc piece top end.

[0010] Further, the base end lower end is fixedly screwed with the blade root by a fixing stud.

[0011] Further, the turbine blade body back surface is inlaid and clamped with a composite back arc piece, an arc piece top end and a base end.

[0012] The turbine anti-corrosion composite blade of the utility model has the advantages that the turbine anti-corrosion composite blade is installed at the back arc surface of the blade body by the composite back arc piece, the composite back arc piece made of nanometer ceramic composite material can enhance the corrosion resistance, high wear resistance and high hardness of the back arc surface of the turbine blade, effectively prolongs the service life of the turbine composite blade, the detachable composite back arc piece is convenient to replace and recycle, the anti-corrosion layer on the surface of the turbine composite blade is further reinforced by the anti-corrosion layer formed by the combination of the carbon fiber and the anti-corrosion paint on the surface of the blade body, the integrity of the anti-corrosion layer of the turbine composite blade is maintained, and the durability of the turbine anti-corrosion composite blade is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 It is a front view structural schematic diagram of the turbine anti-corrosion composite blade of the utility model embodiment.

[0014] Fig. 2 It is a front view partial cross-section structural schematic diagram of the turbine anti-corrosion composite blade of the utility model embodiment.

[0015] Fig. 3 It is a cross-section connecting structural schematic diagram of the blade top and the composite back arc piece.

[0016] Fig. 4 It is a top view cross-section structural schematic diagram of the blade body and the composite back arc piece.

[0017] In the drawing: 1, turbine blade body; 2, blade body; 21, martensite steel inner layer; 22, anti-corrosion fiber outer layer; 3, blade top; 31, positioning stud; 32, positioning screw hole; 4, blade root; 5, composite back arc piece; 51, arc piece top end; 52, base end; 53, fixing stud. DETAILED DESCRIPTION

[0018] Reference Figs. 1 to 4As shown, the utility model provides a kind of steam turbine anticorrosion composite blade, comprising: steam turbine blade body 1, steam turbine blade body 1 mainly contains blade 2, blade top 3 and blade root 4,

[0019] The inside of blade 2 is provided with martensite steel inner layer 21, the outside of martensite steel inner layer 21 is combined with anticorrosion fiber outer layer 22, the back groove surface of blade 2 is attached with composite back cam piece 5, the upper end of composite back cam piece 5 is attached with blade top 3 through cam piece top end 51, the lower end of composite back cam piece 5 is attached with blade root 4 through base end 52, and blade top 3 is screwed with cam piece top end 51 by positioning stud 31.

[0020] Steam turbine anticorrosion composite blade is composed of blade 2, blade top 3, blade root 4 and composite back cam piece 5, through the composite back cam piece 5 of nanometer ceramic composite material at the back of blade 2, the anticorrosion performance, high wear resistance and high hardness of steam turbine blade back cam surface are conveniently strengthened, the service life of steam turbine composite blade is effectively prolonged, and the detachable composite back cam piece 5 is convenient to replace and easy to recycle and reuse, and further through the anticorrosion fiber outer layer 22 formed by the combination of carbon fiber and anticorrosion paint on the surface of blade 2, the anticorrosion layer on the surface of steam turbine composite blade is further reinforced, the integrity of the anticorrosion layer of steam turbine composite blade is delayed and maintained, and the durability of steam turbine anticorrosion composite blade is improved.

[0021] In the embodiment, blade top 3 is welded to the upper end of blade 2, and blade root 4 is welded to the lower end of blade 2. The anticorrosion fiber outer layer 22 is fixedly connected to the side surface of blade 2 in a honeycomb net shape.

[0022] As a preferred embodiment, steam turbine blade body 1 is fixedly installed on the impeller of steam turbine through blade root 4, so that steam turbine blade body 1 can rotate following the movement of the impeller of steam turbine. Steam turbine blade body 1 is connected with the shroud through blade top 3, so that a plurality of steam turbine blade bodies 1 can be connected. Blade 2 forms a steam flow channel with adjacent blades through its streamline shape (the streamline shape of blade 2 is the blade shape of existing mature technology). The anticorrosion fiber outer layer 22 is formed by the combination of net-shaped carbon fiber and anticorrosion paint, so as to further reinforce the anticorrosion layer on the surface of steam turbine composite blade, delay and maintain the integrity of the anticorrosion layer of steam turbine composite blade, and improve the durability of steam turbine anticorrosion composite blade.

[0023] In the embodiment, positioning screw hole 32 is formed in the inside of blade top 3, and positioning stud 31 is screwed into positioning screw hole 32. Positioning stud 31 is vertically screwed into cam piece top end 51. Base end 52 is fixedly connected with blade root 4 through fixing stud 53. Composite back cam piece 5, cam piece top end 51 and base end 52 are inlaid and clamped on the back of steam turbine blade body 1.

[0024] As a preferred embodiment, the composite back arc piece 5 is screw-connected to the back of the turbine blade body 1, and is a detachable reinforcing structure for the back of the blade body 2. The composite back arc piece 5 made of nano ceramic composite material has excellent corrosion resistance, high wear resistance and high hardness, which can enhance the strength of the back of the blade body 2, slow down the frequent impact of water droplets, effectively prolong the service life of the turbine composite blade, and the detachable composite back arc piece 5 can be replaced separately to reduce the cost and facilitate recycling.

[0025] The turbine anti-corrosion composite blade can effectively solve the problem that the back arc surface of the blade is frequently impacted by water droplets, which causes the anti-corrosion layer to be damaged and affects the service life of the turbine blade. The turbine anti-corrosion composite blade can enhance the corrosion resistance, high wear resistance and high hardness of the back arc surface of the turbine blade, effectively prolong the service life of the turbine composite blade, and the detachable composite back arc piece can be easily replaced and recycled, further reinforcing the anti-corrosion layer on the surface of the turbine composite blade, delaying and maintaining the integrity of the anti-corrosion layer of the turbine composite blade, improving the durability of the turbine anti-corrosion composite blade, and being suitable for the turbine anti-corrosion composite blade.

Claims

1. A corrosion-protected composite blade for a gas turbine engine, comprising: A steam turbine blade body (1) mainly comprises a blade body (2), a blade tip (3) and a blade root (4), characterized in that: An inner layer (21) of martensite steel is arranged on the inner side of the blade body (2), and an outer layer (22) of corrosion-resistant fiber is compounded on the outer side of the inner layer (21); a composite back arc piece (5) is attached to the back groove surface of the blade body (2); the upper end of the composite back arc piece (5) is attached to the blade tip (3) through an arc piece top end (51); the lower end of the composite back arc piece (5) is attached to the blade root (4) through a base end (52); and the blade tip (3) is screwed with the arc piece top end (51) through a positioning stud (31).

2. A corrosion protection composite blade for a gas turbine according to claim 1, characterized in that The blade tip (3) is welded on the upper end of the blade body (2), and the blade root (4) is welded on the lower end of the blade body (2).

3. A corrosion resistant composite blade for a gas turbine engine as defined in claim 1, wherein The outer layer (22) of corrosion-resistant fiber is fixed on the side surface of the blade body (2) in a honeycomb net shape.

4. A corrosion resistant composite blade for a gas turbine engine as defined in claim 1, wherein A positioning screw hole (32) is arranged on the inner side of the blade tip (3), and the positioning screw hole (32) is embedded with the positioning stud (31) through screwing.

5. A corrosion resistant composite blade for a gas turbine engine as defined in claim 1, wherein The positioning stud (31) is vertically screwed in the arc piece top end (51).

6. A corrosion resistant composite blade for a gas turbine engine as defined in claim 1, wherein The base end (52) is screwed with the blade root (4) through a fixing stud (53).

7. A corrosion resistant composite blade for a gas turbine engine as defined in claim 1, wherein The composite back arc piece (5), the arc piece top end (51) and the base end (52) are inlaid and clamped on the back surface of the steam turbine blade body (1).

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