CN210141158U

CN210141158U - High-strength turbine blade

Info

Publication number: CN210141158U
Application number: CN201920809260.1U
Authority: CN
Inventors: 刘达; 王河平; 宗国翼
Original assignee: Nanjing Sai Da Machinery Manufacturing Co Ltd
Current assignee: Nanjing Saida Technology Co.,Ltd.
Priority date: 2019-05-31
Filing date: 2019-05-31
Publication date: 2020-03-13
Anticipated expiration: 2029-05-31

Abstract

The utility model discloses a high strength steam turbine blade, blade body include inner arc side and outer arc side, and blade body is equipped with a plurality of sand grip that keep out the wind in inner arc side department, the sand grip that keeps out the wind sets up along the length direction of blade body, and a side that the sand grip that keeps out the wind kept away from the blade body extends to the air inlet side of blade body has the wind-blocking piece, the contained angle between wind-blocking piece and the sand grip that keeps out the wind is the obtuse angle; the utility model discloses a turbine blade antifriction performance is stronger.

Description

High-strength turbine blade

Technical Field

The invention relates to the technical field of turbine blades, in particular to a high-strength turbine blade.

Background

The titanium alloy is a novel structural material, and has excellent comprehensive properties, such as small density (4.5 g cm < -3 >), high specific strength and specific fracture toughness, good fatigue strength and crack expansion resistance, good low-temperature toughness and excellent corrosion resistance, and the maximum working temperature of certain titanium alloys is 550 ℃, and can be expected to reach 700 ℃; the density of titanium metal is lower, 4.5g/cm3, only 60 parts of iron, and the titanium metal and the magnesium are generally called light metal, and the corresponding titanium alloy, aluminum alloy and magnesium alloy are called light alloy; the importance of titanium alloy materials is recognized in many countries around the world, and the titanium alloy materials are successively researched and developed and are put into practical use.

Therefore, the composite material is increasingly widely applied to aviation, aerospace, chemical engineering, shipbuilding and other industrial departments, and is rapidly developed. The temperature dependence of light alloys, steel, etc. (σ 0.2/density) is higher for titanium alloys than for other light metals, steel and nickel alloys and this advantage can be kept around 500 ℃, so some titanium alloys are suitable for the manufacture of gas turbine components.

Because the turbine blade is acted by high-temperature and high-pressure steam to work, the turbine blade bears the larger friction force of the steam in the work process, the turbine blade can be broken and other faults after working for a long time, and when the steam rubs the turbine blade, the turbine blade can be damaged due to the higher temperature.

Disclosure of Invention

The invention aims to solve the technical problem of how to improve the friction resistance of the turbine blade.

In order to solve the technical problems, the invention provides a high-strength turbine blade which comprises a blade root, a blade body and a blade shroud, wherein the blade root, the blade body and the blade shroud are sequentially and fixedly connected, the blade body comprises an inner arc side surface and an outer arc side surface, a plurality of wind blocking convex strips are arranged on the inner arc side surface of the blade body, the wind blocking convex strips are arranged along the length direction of the blade body, a wind blocking block extends from one side, away from the blade body, of each wind blocking convex strip to the air inlet side of the blade body, and the included angle between each wind blocking convex strip and each wind blocking convex strip is an obtuse angle.

Further, the obtuse angle is 120-150 degrees.

Preceding high strength steam turbine blade, all seted up a plurality of ventilation holes on the sand grip that keeps out the wind.

The high-strength turbine blade, the ventilation hole is evenly arranged on the sand grip that keeps out the wind, and adjacent the ventilation hole dislocation of keeping out the wind on the sand grip that keeps out the wind mutually.

The invention has the beneficial effects that:

(1) in the steam turbine blade, the wind shielding convex strips are added on the blade body, so that the resistance of the blade body to steam can be improved, the utilization of the steam by the steam turbine blade is improved, the efficiency of the steam turbine blade is improved, in addition, the added wind shielding blocks can further improve the resistance of the wind shielding convex strips to the steam, and the included angle between the wind shielding blocks and the wind shielding convex strips is an obtuse angle, so that the steam can smoothly pass through the wind shielding convex strips and the wind shielding blocks, and the steam turbine blade is not easy to shake;

(2) according to the invention, the vent holes are formed in the wind shielding convex strips, water vapor sequentially passes through the wind shielding convex strips, so that the impact force of the water vapor on the first wind shielding convex strip is prevented from being too large, the water vapor can be distributed on the plurality of wind shielding convex strips, and in addition, the vent holes in the adjacent wind shielding convex strips are arranged in a staggered manner, so that the water vapor passing through the wind shielding convex strips from the vent holes can firstly impact on the wind shielding convex strips instead of directly impacting on the vent holes of the wind shielding convex strips, thereby ensuring the utilization rate of the water vapor.

Drawings

FIG. 1 is a schematic structural view of a blade body embodying the present invention;

fig. 2 is a schematic structural view of the present invention for embodying the wind-deflecting strip and the wind deflector.

Wherein: 1. a blade root; 2. a leaf body; 3. a leaf shroud; 4. a wind blocking convex strip; 5. a wind blocking block; 6. a vent hole.

Detailed Description

The embodiment provides a high strength turbine blade, as shown in fig. 1 and 2, including blade root 1, blade body 2 and blade shroud 3, blade root 1, blade body 2 and blade shroud 3 are fixed connection in proper order, blade body 2 includes inner arc side and outer arc side, blade body is equipped with a plurality of sand grip 4 that keep out the wind in inner arc side department, sand grip 4 that keeps out the wind can improve blade body to the resistance of vapor, improve turbine blade's work efficiency, and sand grip 4 that keeps out the wind sets up along the length direction of blade body 2, in addition, one side that keeps away from blade body 2 at sand grip 4 that keeps out the wind extends to the air inlet side of blade body 2 has the piece 5 that keeps out the wind, can further improvement sand grip 4 that keeps out the wind to the resistance of vapor, further improvement turbine blade's work efficiency, and in this scheme, be the obtuse angle with the contained angle between the sand grip 5 that keeps out the wind and the sand grip 4 that keeps out the wind.

Specifically, in this embodiment, a plurality of ventilation holes 6 have all been seted up on the sand grip 4 that will keep out the wind, water supply steam passes sand grip 4 that keeps out the wind in proper order, it is too big to prevent the impact force of steam to first sand grip 4 that keeps out the wind, can be with the reposition of redundant personnel on a plurality of sand grip 4 that keep out the wind, it is specific again, ventilation hole 6 evenly arranges on sand grip 4 that keeps out the wind, and ventilation hole 6 dislocation each other on the adjacent sand grip 4 that keeps out the wind, the setting of ventilation hole 6 dislocation each other on the adjacent sand grip 4 that keeps out the wind, can make and pass the steam of sand grip 4 that keeps out the wind by ventilation hole 6 and strike on sand grip 4 that keeps out the wind at first, but direct impact is.

The turbine blade comprises the following components in parts by weight: c: 7 parts, Si: 4 parts, Mn: 0.8 part, V: 2 parts of Ti: 9 parts, Al: 2 parts, S: 1 part, nickel: 4 parts of molybdenum disulfide: 3 parts of carbon fiber: 3 parts of styrene-butadiene-styrene block copolymer: 3.6 parts of an anti-wear agent: 4 parts, antioxidant: 1 part, dispersant: 2 parts of filler: 6 parts.

The wear-resisting agent can improve the wear resistance of the turbine blade and comprises nano aluminum oxide, nano zinc oxide and silicon carbide, the ratio of the nano aluminum oxide to the nano zinc oxide to the silicon carbide is 5:2:1, the dispersing agent is one or a mixture of more than two of silicone powder and polytetrafluoroethylene powder, and the antioxidant is a mixture of antioxidant 1098 and antioxidant 168.

A method for manufacturing a high-strength turbine blade comprises the following steps:

a. adding the C, Si, Mn, V, Ti, Al and S in the proportion into a smelting furnace, heating the smelting furnace to 920-class 935 ℃ for 35-40min, then heating to 1400-class 1450 ℃, stirring to completely melt the raw materials, adding nickel, molybdenum disulfide, carbon fiber, styrene-butadiene-styrene block copolymer, wear-resisting agent, antioxidant and filler, rapidly heating to 1200-class 1500 ℃, stirring and heating for 4-6 hours, and then preserving heat for 1-2 hours to form an alloy solution for later use;

b. and (b) heating and melting the alloy solution in the step a, injecting the melted alloy solution into a mold through a nozzle, cooling and opening the mold to obtain a blank.

c. Heating the blank to 430-490 ℃, keeping the temperature for 10-13min after reaching the temperature, and then cooling the blank to room temperature by air; heating the blank to 650 ℃ at 620 ℃ and keeping the temperature for 10-11min after reaching the temperature, and then cooling the blank to room temperature by water; heating the steel plate blank to 730 ℃ and 750 ℃, preserving the heat for 25-30min after reaching the temperature, and then cooling the steel plate blank to the room temperature in air.

Wherein, in the step b, the temperature of the mold is controlled at 250-355 ℃ before the alloy solution is added into the mold.

Example 2: the high-strength steam turbine blade is different from the embodiment 1 in that the steam turbine blade comprises the following components in parts by weight: c: 8 parts, Si: 4.5 parts, Mn: 0.9 part, V: 2.5 parts, Ti: 10.5 parts, Al: 2.5 parts, S: 1.5 parts, nickel: 4.5 parts of molybdenum disulfide: 3.5 parts, carbon fiber: 4 parts of styrene-butadiene-styrene block copolymer: 3.9 parts of an anti-wear agent: 4.5 parts, antioxidant: 1.25 parts, dispersant: 2.5 parts of filler: 7.5 parts.

Example 3: the high-strength steam turbine blade is different from the embodiment 1 in that the steam turbine blade comprises the following components in parts by weight: c: 9 parts, Si: 5 parts, Mn: 1 part, V: 3 parts of Ti: 12 parts, Al: 3 parts, S: 2 parts, nickel: 5 parts of molybdenum disulfide: 4 parts of carbon fiber: 5 parts of styrene-butadiene-styrene block copolymer: 4.2 parts of an anti-wear agent: 5 parts, antioxidant: 1.5 parts, dispersant: 3 parts of filler: 9 parts.

The test results are as follows:

the performance is measured according to the national standard, the test conditions and other experimental materials are the same, and the test results are shown in table 1:

watch 1

From the experimental results in table one, it is understood that the steam turbine blades of examples 1 to 3 have a hardness higher than that of the comparative example, that is, the hardness of the steam turbine blade is improved, and from the product appearance, that is, the surface morphology of the blade after rubbing, it is understood that the steam turbine blades of examples 1 to 3 have a better anti-rubbing performance than that of the comparative example.

In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims

1. The utility model provides a high strength steam turbine blade, includes blade root (1), blade body (2) and shroud (3), blade root (1), blade body (2) and shroud (3) fixed connection in proper order, blade body (2) include inner arc side and outer arc side, its characterized in that: leaf body (2) are equipped with a plurality of sand grip (4) of keeping out the wind in inner arc side department, the length direction setting of leaf body (2) is followed in sand grip (4) of keeping out the wind, just one lateral direction that leaf body (2) were kept away from in sand grip (4) the air inlet side of leaf body (2) extends and has wind-blocking piece (5), wind-blocking piece (5) and the contained angle of keeping out the wind between sand grip (4) are the obtuse angle.

2. A high strength steam turbine blade according to claim 1 wherein: the obtuse angle is 120-150 degrees.

3. A high strength steam turbine blade according to claim 1 wherein: all seted up a plurality of ventilation holes (6) on sand grip (4) keep out the wind.

4. A high strength steam turbine blade according to claim 3 wherein: the ventilation holes (6) are uniformly distributed on the wind blocking convex strips (4), and the ventilation holes (6) on the wind blocking convex strips (4) which are adjacent are staggered mutually.