A high pressure outlet guide vane for a gas turbine

Abstract

The application discloses a high-pressure outlet guide vane for a gas turbine, belonging to the technical field of gas turbines. The high-pressure outlet guide vane comprises twin vane, an inner ring and an outer ring, the inner and outer sides of the twin vane are connected and installed with the inner ring and the outer ring respectively, the fixed mode of the twin vane and the outer ring adopts pin riveting, the pin penetrates the fixed vane root, the top of the twin vane is not top-cut type, but has a 5mm-high tenon, which is convenient for installation with the inner ring, that is, the connection of the twin vane and the inner ring adopts gap fit, the maximum gap is ensured to be within 0.35mm, and after the installation is completed, hot riveting is processed, so as to achieve the purpose of fastening the vane and the inner ring. The research and development purpose of the application is to solve the problems of low working efficiency, short service life and influence on safe operation of the compressor high-pressure outlet vane of the gas turbine, the application ensures that the high-pressure outlet guide vane can safely and efficiently operate under variable working conditions, increases the stability of the vane, and improves the working efficiency of the vane.

Description

Technical Field

[0001] This invention relates to a high-pressure outlet guide vane suitable for gas turbines, belonging to the field of gas turbine technology. Background Technology

[0002] Gas turbines are highly efficient heat-to-work conversion devices, core components in power generation and drive systems. Due to their extreme design and manufacturing complexity, they have become a focal point for the equipment manufacturing industry. Currently, the high-pressure outlet blades used in gas turbine compressors are of limited variety, employ primitive design methods, have low calculation accuracy, and suffer from uneven blade profiles, resulting in low efficiency and short service life. This has severely impacted the economic efficiency and safety of gas turbine compressors.

[0003] Therefore, there is an urgent need to develop a new type of high-pressure outlet guide vane suitable for gas turbines to solve the above-mentioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of low efficiency, short service life, and impact on the safe operation of high-pressure outlet blades in gas turbine compressors. Therefore, it provides a twin high-pressure outlet guide vane for a gas turbine compressor. A brief overview of the invention is given below to provide a basic understanding of certain aspects of the invention. It should be understood that this overview is not an exhaustive summary of the invention. It is not intended to identify key or essential parts of the invention, nor is it intended to limit the scope of the invention.

[0005] The technical solution of this invention:

[0006] A high-pressure outlet guide vane suitable for a gas turbine includes twin blades, an inner ring, and an outer ring. The inner and outer sides of the twin blades are connected and installed to the inner and outer rings, respectively. The twin blades adopt a twin structure and are arranged along the airflow direction. They include a first stationary blade and a second stationary blade. The first stationary blade is a torsion-resistant blade, comprising a working part, a root, and a tip. The working part has a root and a tip at both ends. The working part is a variable cross-section torsion blade with different cross-sectional shapes along its height, gradually decreasing in size from the root to the tip. Adjacent cross-sections exhibit relative torsion. The working part, from the root to the tip, defines the cross-sectional height variation range of cross-sections AA to EE as 3mm-41mm, the chord length variation range as 30.011mm-30.015mm, the installation angle variation range as 48°40′-47°11′, the maximum profile thickness as 1.8mm, the height range of the inlet edge from the centerline as 1.241mm-1.834mm, and the height range of the outlet edge from the centerline as 1. The blade's working section has a height of 43.5 mm, ranging from 0.709 mm to 1.529 mm.

[0007] Preferably, the cross-sectional height h1 of the working part of the blade AA is 3mm, the chord length of the working part of the blade at this position is 30.011mm, the installation angle is 48°40′, the height of the air inlet edge from the center line is 1.241mm, and the height of the air outlet edge from the center line is 1.709mm.

[0008] Preferably, the cross-sectional height h2 of the working part of the blade is 13mm, the chord length of the working part of the blade at this position is 30.012mm, the installation angle is 48°11′, the height of the air inlet edge from the center line is 1.455mm, and the height of the air outlet edge from the center line is 1.666mm.

[0009] Preferably, the cross-sectional height h3 of the working part of the blade CC is 23mm, the chord length of the working part of the blade at this position is 30.013mm, the installation angle is 47°50′, the height of the air inlet edge from the center line is 1.590mm, and the height of the air outlet edge from the center line is 1.621mm.

[0010] Preferably, the cross-sectional height h4 of the working part of the blade is 33mm, the chord length of the working part of the blade at this position is 30.014mm, the installation angle is 47°29′, the height of the air inlet edge from the center line is 1.721mm, and the height of the air outlet edge from the center line is 1.570mm.

[0011] Preferably, the cross-sectional height h5 of the working section EE of the blade is 41mm, the chord length of the working section of the blade at this position is 30.015mm, the installation angle is 47°11′, the height of the air inlet edge from the center line is 1.834mm, and the height of the air outlet edge from the center line is 1.529mm.

[0012] Preferably, the second stationary blade is a non-twist blade with a total blade length of 43.5 mm, an installation angle of 76°24′, an air inlet edge height of 2.589 mm from the center line, and an air outlet edge height of 2.636 mm from the center line.

[0013] Preferably, the first stationary blade and the second stationary blade are embedded on the same outer ring and are both fixedly connected to it by pins.

[0014] Preferably, the pin connecting the first stationary blade to the outer ring is perpendicular to the outer end face, and the pin connecting the second stationary blade to the outer ring forms a 32° angle with the horizontal center line.

[0015] Preferably, the connection between the first and second stationary blades and the inner ring is a clearance fit, with the maximum clearance guaranteed to be within 0.35mm.

[0016] The present invention has the following beneficial effects:

[0017] 1. This invention is based on the full three-dimensional design of the high-pressure outlet guide vane using one-dimensional / quasi-three-dimensional / full three-dimensional aerodynamic and thermodynamic analysis calculations. The calculation accuracy is high, which organically combines the safety and efficiency of the high-pressure outlet guide vane of this invention.

[0018] 2. This invention ensures the safe and efficient operation of the high-pressure outlet guide vane under varying operating conditions, increases the stability of the vane, and improves the working efficiency of the vane. The working efficiency of the vane is 2 percentage points higher than that of existing vanes.

[0019] 3. The blades of the present invention have an extended service life, which is 40% to 60% longer than that of existing blades. Attached Figure Description

[0020] Figure 1 This is a diagram showing the installation of a high-pressure outlet guide vane for a gas turbine according to the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of the first stationary blade of the present invention;

[0022] Figure 3 This is a profile diagram of the first stationary blade of the present invention;

[0023] Figure 4 This is a profile diagram of the second stationary blade of the present invention.

[0024] In the diagram: 1-Twin leaves, 2-Inner ring, 3-Outer ring, 4-First still leaf blade, 5-Second still leaf blade, 6-Working part of the leaf, 7-Leaf root, 8-Leaf tip. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0026] The connections mentioned in this invention are divided into fixed connections and detachable connections. Fixed connections, also known as non-detachable connections, include but are not limited to conventional fixed connection methods such as folded connections, riveted connections, adhesive connections, and welded connections. Detachable connections include but are not limited to conventional disassembly methods such as threaded connections, snap-fit ​​connections, pin connections, and hinged connections. When a specific connection method is not explicitly defined, it is assumed that at least one existing connection method can always be found to achieve the function, and those skilled in the art can choose according to their needs. For example, a welded connection can be chosen for fixed connections, and a hinged connection can be chosen for detachable connections.

[0027] Specific implementation method one: Combining Figures 1-4 This embodiment describes a high-pressure outlet guide vane suitable for a gas turbine, comprising twin blades 1, an inner ring 2, and an outer ring 3. The inner and outer sides of the twin blades 1 are connected and installed to the inner ring 2 and the outer ring 3, respectively. The twin blades 1 are fixed to the outer ring 3 by pin riveting, with the pins penetrating the root of the fixed blade. The tip of the twin blades 1 is not a top-cut type, but has a tenon with a height of 5mm to facilitate installation with the inner ring 2. That is, the connection between the twin blades 1 and the inner ring 2 adopts a clearance fit, with the maximum clearance guaranteed to be within 0.35mm. After installation, hot riveting is performed to achieve the purpose of fastening the blades to the inner ring.

[0028] The twin blades 1 are made of high-temperature alloy forging material GH2696, and the outer ring 3 and inner ring 2 are both made of stainless steel forging material 20Cr13.

[0029] The twin blades 1 adopt a twin structure. The first set of twin blades is defined as the first stationary blade 4, and the second set of twin blades is the second stationary blade 5. That is, it includes the first stationary blade 4 and the second stationary blade 5, which are arranged along the airflow direction. The first stationary blade 4 and the second stationary blade 5 are embedded in the same outer ring 3 and are fixedly connected to it by pins. By different installation angles of the two sets of blades, the function of changing the airflow direction is realized. The pin connecting the first stationary blade 4 to the outer ring 3 is perpendicular to the outer end face. The pin connecting the second stationary blade 5 to the outer ring 3 forms a 32° angle with the horizontal center line. To ensure the accuracy of the connection, a countersunk platform of Ф10 is provided on the end face to facilitate pin positioning.

[0030] The first stationary blade 4 and the second stationary blade 5 are connected to the inner ring 2 with a clearance fit, and the maximum clearance is guaranteed to be within 0.35mm.

[0031] The second stationary blade 5 is a non-twisting blade, meaning that the cross-section of the second stationary blade 5 is a uniform cross-section structure. The first stationary blade 4 is a twistable blade, comprising a working part 6, a root 7, and a tip 8. The working part 6 has a root 7 and a tip 8 at both ends. The working part 6 is a variable cross-section twisted blade with different cross-sectional shapes along its height. The cross-section gradually decreases from the root to the tip, and adjacent cross-sections are relatively twisted. The working part 6, from the root to the tip, defines the cross-sectional height variation range of cross-sections AA to EE as 3mm-41mm, the chord length variation range as 30.011mm-30.015mm, the installation angle variation range as 48°40′-47°11′, the maximum thickness of the profile as 1.8mm, the height range of the inlet edge from the centerline as 1.241mm-1.834mm, the height range of the outlet edge from the centerline as 1.709mm-1.529mm, and the total height of the working part 6 as 43.5mm.

[0032] The cross-sectional height h1 of the cross-section AA of the working part 6 of the blade is 3mm. The chord length of the working part 6 of the blade at this position is 30.011mm, the installation angle is 48°40′, the height of the air inlet edge from the center line is 1.241mm, and the height of the air outlet edge from the center line is 1.709mm.

[0033] The cross-sectional height h2 of the working part 6 of the blade is 13mm, the chord length of the working part 6 of the blade at this position is 30.012mm, the installation angle is 48°11′, the height of the air inlet edge from the center line is 1.455mm, and the height of the air outlet edge from the center line is 1.666mm.

[0034] The cross-sectional height h3 of the cross-section CC of the working part 6 of the blade is 23mm. The chord length of the working part 6 of the blade at this position is 30.013mm, the installation angle is 47°50′, the height of the air inlet edge from the center line is 1.590mm, and the height of the air outlet edge from the center line is 1.621mm.

[0035] The cross-sectional height h4 of the working part 6 of the blade is 33mm, the chord length of the working part 6 of the blade at this position is 30.014mm, the installation angle is 47°29′, the height of the air inlet edge from the center line is 1.721mm, and the height of the air outlet edge from the center line is 1.570mm.

[0036] The cross-sectional height h5 of the cross section EE of the working part 6 of the blade is 41mm. The chord length of the working part 6 of the blade at this position is 30.015mm, the installation angle is 47°11′, the height of the air inlet edge from the center line is 1.834mm, and the height of the air outlet edge from the center line is 1.529mm.

[0037] The second stationary blade 5 is a non-twist blade. The total length of the second stationary blade 5 is 43.5 mm, the installation angle is 76°24′, the height of the air inlet edge from the center line is 2.589 mm, and the height of the air outlet edge from the center line is 2.636 mm.

[0038] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be permuted and combined. Those skilled in the art can exhaust all possibilities based on the mathematical knowledge of permutation and combination. Therefore, the present invention will not describe the technical solutions after permutation and combination one by one, but it should be understood that the technical solutions after permutation and combination have been disclosed by the present invention.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-pressure outlet guide vane suitable for gas turbines, characterized in that: The device includes twin blades (1), an inner ring (2), and an outer ring (3). The inner and outer sides of the twin blades (1) are connected and installed to the inner ring (2) and the outer ring (3) respectively. The twin blades (1) adopt a twin structure and are arranged along the airflow direction. They include a first stationary blade (4) and a second stationary blade (5). The first stationary blade (4) is a twistable blade. The first stationary blade (4) includes a working part (6), a root (7), and a tip (8). The working part (6) has a root (7) and a tip (8) at both ends. The working part (6) is a variable cross-section twisted blade with different cross-sectional shapes along the blade height. The surface gradually decreases from the root to the top, and there is relative twist between adjacent sections. The working part of the blade (6) is defined from the root to the top. The section height of the section AA to the section EE varies from 3mm to 41mm, the chord length varies from 30.011mm to 30.015mm, the installation angle varies from 48°40′ to 47°11′, the maximum thickness of the profile is 1.8mm, the height of the air inlet edge from the center line varies from 1.241mm to 1.834mm, the height of the air outlet edge from the center line varies from 1.709mm to 1.529mm, and the total height of the working part of the blade (6) is 43.5mm. The second stationary blade (5) is a non-twisted blade. The total length of the second stationary blade (5) is 43.5 mm, the installation angle is 76°24′, the height of the air inlet edge from the center line is 2.589 mm, and the height of the air outlet edge from the center line is 2.636 mm.

2. The high-pressure outlet guide vane for a gas turbine according to claim 1, characterized in that: The cross section height h1 of the cross section AA of the working part of the blade (6) is 3mm. The chord length of the working part of the blade (6) corresponding to this position is 30.011mm, the installation angle is 48°40′, the height of the air inlet edge from the center line is 1.241mm, and the height of the air outlet edge from the center line is 1.709mm.

3. A high-pressure outlet guide vane for a gas turbine according to claim 2, characterized in that: The cross section height h2 of the working part (6) of the blade is 13mm, the chord length of the working part (6) of the blade at this position is 30.012mm, the installation angle is 48°11′, the height of the air inlet edge from the center line is 1.455mm, and the height of the air outlet edge from the center line is 1.666mm.

4. A high-pressure outlet guide vane for a gas turbine according to claim 3, characterized in that: The cross section height h3 of the working part (6) of the blade is 23mm, the chord length of the working part (6) of the blade at this position is 30.013mm, the installation angle is 47°50′, the height of the air inlet edge from the center line is 1.590mm, and the height of the air outlet edge from the center line is 1.621mm.

5. A high-pressure outlet guide vane for a gas turbine according to claim 4, characterized in that: The cross section height h4 of the working part (6) of the blade is 33mm, the chord length of the working part (6) of the blade at this position is 30.014mm, the installation angle is 47°29′, the height of the air inlet edge from the center line is 1.721mm, and the height of the air outlet edge from the center line is 1.570mm.

6. A high-pressure outlet guide vane for a gas turbine according to claim 5, characterized in that: The cross section height h5 of the working part of the blade (6) is 41mm, the chord length of the working part of the blade (6) at this position is 30.015mm, the installation angle is 47°11′, the height of the air inlet edge from the center line is 1.834mm, and the height of the air outlet edge from the center line is 1.529mm.

7. A high-pressure outlet guide vane for a gas turbine according to claim 6, characterized in that: The first stationary blade (4) and the second stationary blade (5) are embedded on the same outer ring (3) and are fixedly connected to it by pins.

8. A high-pressure outlet guide vane for a gas turbine according to claim 7, characterized in that: The pin connecting the first stationary blade (4) to the outer ring (3) is perpendicular to the outer end face, and the pin connecting the second stationary blade (5) to the outer ring (3) forms a 32° angle with the horizontal center line.

9. A high-pressure outlet guide vane for a gas turbine according to claim 8, characterized in that: The connection between the first stationary blade (4) and the second stationary blade (5) and the inner ring (2) adopts a clearance fit, and the maximum clearance is guaranteed to be within 0.35mm.

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