Variable pre-whirl angle guide vane adjustment structure for turbine performance test piece

Abstract

The adjustable structure of the guide vane with variable pre-whirl angle for the turbine performance test piece of the present invention is applicable to the adjustment of the blade angle of the guide vane installed between the inner and outer casings, and includes an active drive assembly, a linkage ring and a driven drive assembly installed circumferentially on the outer casing. The linkage ring is installed circumferentially on the outer casing, wherein: the active drive assembly is fixedly connected to one end of the first blade far from the inner casing and the linkage ring respectively, driving the first blade to rotate radially around the outer casing and driving the linkage ring to rotate circumferentially along the outer casing; the driven drive assembly is connected to the linkage ring and the second blade respectively, and when the active drive assembly drives the linkage ring to rotate, driven by the linkage ring, the second blade is driven to rotate radially around the outer casing through the driven drive assembly, and the rotation angle is synchronously changed with that of the first blade. The test efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of air flow regulating devices for aero-engines, and particularly relates to a regulating structure of a guide vane for a variable pre-whirl angle of a turbine performance test piece. Background Art

[0002] The performance test of turbine components is an important link in the development process of aero-engines. For turbine components, by using the methods of geometric similarity, dynamic similarity, and kinematic similarity, corresponding test pieces are designed, and with the help of a turbine comprehensive test rig platform, the purpose is to evaluate the performance and partial strength of the components or simulate the working state of real components, providing data support for the improvement of the aerodynamic performance and structural strength of turbine components.

[0003] As a new generation of engines, variable cycle engines can work in the best state under various flight conditions by adjusting the thermodynamic cycle parameters, which is an important development direction for future aero-engines. In the aspect of turbojet / turbofan engines, the research focus is on changing the bypass ratio, which usually has two or more external bypass ducts. During the operation of the engine, the change in the bypass ratio directly affects the design operating point of the turbine. Based on this characteristic, in the current design of low-pressure turbine performance test pieces, in order to simulate the states of the incoming flow at the inlet of different low-pressure turbines and play a role in pre-whirl, inlet guide vanes with different installation angles are set, so as to achieve the purpose of verifying the aerodynamic performance. Since the geometric angles of the conventional guide vane blades are not adjustable, in order to meet the test requirements of different working conditions, multiple sets of guide vane blades need to be prepared and replaced before each test, which cannot adapt to the test conditions of different air flow angles and seriously affects the test efficiency. Summary of the Invention

[0004] In view of this, the invention provides a regulating structure of a guide vane for a variable pre-whirl angle of a turbine performance test piece, which solves the technical problem that the existing method is troublesome in the test because the guide vane blades need to be frequently disassembled.

[0005] A regulating structure of a guide vane for a variable pre-whirl angle of a turbine performance test piece is provided, which is suitable for adjusting the angle of the guide vane blades installed between the inner and outer casings. The guide vane blades include a first blade and a second blade, and it includes an active driving component, a linkage ring, and a driven driving component installed circumferentially on the outer casing. The linkage ring is installed circumferentially on the outer casing, wherein:

[0006] The active driving component is respectively fixedly connected to one end of the first blade far from the inner casing and the linkage ring, driving the first blade to rotate radially around the outer casing and driving the linkage ring to rotate circumferentially along the outer casing;

[0007] The driven drive assembly is respectively connected to the linkage ring and the second vane. When the active drive assembly drives the linkage ring to rotate, the second vane is driven by the driven drive assembly to rotate around the radial direction of the outer casing under the drive of the linkage ring, and the rotation angle is synchronously changed with that of the first vane.

[0008] Advantages of the present invention:

[0009] The structure of the present invention does not require replacing the flow guiding support plate during the whole test process, and can adjust the blades of the flow guiding support plate to any angle according to the test requirements. The adjustment process is completed by the control device, and the adjustment angle can be fed back in real time through the control system, greatly improving the efficiency of the turbine performance test. The present invention has the advantages of compact structure, flexibility, reliability, etc., is easy to assemble, and has a wide application range. It can be used for both the annular blowing test piece and the stage performance test piece. At the same time, in addition to simulating the variable cycle state of the turbine, it is also applicable to the turbine performance test piece that requires changing the inlet flow angle. Description of the drawings

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0011] Figure 1 is a three-dimensional structure diagram of the present invention;

[0012] Figure 2 is a front view cross-sectional view of the present invention;

[0013] Figure 3 is a schematic diagram of the crank;

[0014] Figure 4 is a schematic diagram of the active rocker arm;

[0015] Figure 5 is a schematic diagram of the slider without splicing and fixing;

[0016] Figure 6 is a schematic diagram of the slider with splicing and fixing;

[0017] Wherein:

[0018] 1. Outer casing; 2. Inner casing; 3. First blade; 4. Second blade; 5. Linking ring; 61. Motor; 62. Support frame; 63. Crank; 64. Boss; 65. Driving rocker arm; 631. Cylindrical part; 632. Arc part; 6311. First convex block; 6321. Second convex block; 651. Through slot; 652. First part; 653. Second part; 654. Arc part; 655. Docking part; 6531. Rectangular hole; 71. Upper slider; 72. Lower slider; 73. Mounting hole; 74. Slide groove; 8. Driven rocker arm. Detailed implementation manners

[0019] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] The following describes the implementation manners of the present invention through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0021] It should be noted that the following text describes various aspects of the embodiments within the scope of the appended claims. It should be obvious that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present invention, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, this device and / or this method can be implemented using other structures and / or functions in addition to one or more of the aspects described herein.

[0022] As Figure 1 shown, a flow guiding support plate adjusting structure with a variable pre - swirl angle for a turbine performance test piece is applicable to adjusting the blade angles of the flow guiding support plate installed between the inner casing 2 and the outer casing 1. The flow guiding support plate blades include a first blade 3 and a second blade 4, and include a driving drive assembly, a linking ring 5 and a driven drive assembly installed circumferentially on the outer casing 1. The linking ring 5 is installed circumferentially on the outer casing 1, wherein:

[0023] As Figure 2As shown, the active drive assembly is fixedly connected to one end of the first blade 3 away from the inner casing 2 and the linkage ring 5 respectively, driving the first blade 3 to rotate radially around the outer casing 1 and driving the linkage ring 5 to rotate circumferentially along the outer casing 1;

[0024] The driven drive assembly is connected to the linkage ring 5 and the second blade 4 respectively. When the active drive assembly drives the linkage ring 5 to rotate, driven by the linkage ring 5, the second blade 4 is driven to rotate radially around the outer casing 1 through the driven drive assembly, and the rotation angle is synchronously changed with that of the first blade 3.

[0025] On the above basis, the active drive assembly depends on non - type tests. For small - scale tests, installing one set of active drive assembly is sufficient to generate the driving force for driving the driven drive assembly. For large - scale tests, the number is one or more.

[0026] As a specific implementation provided in this case, as Figure 1 shown, one end of each of the first blade 3 and the second blade 4 is rotatably installed on the inner casing 2. For example, a bushing is sleeved on one end of the first blade 3 and the second blade 4. The bushing is made of wear - resistant material, and bearings are installed at corresponding positions on the inner casing 2 to achieve the rotational connection of the two blades. The other ends of the first blade 3 and the second blade 4 respectively extend out of the outer casing 1 and are correspondingly connected to the active drive assembly and the driven drive assembly.

[0027] As a specific implementation provided in this case, the active drive assembly includes a motor 61, a support frame 62, a crank 63, a boss 64 and an active rocker arm 65. Specifically:

[0028] As Figure 3 shown, the structure of the crank 63: The crank 63 includes a cylindrical part 631 and an arc part 632. One end of the arc part 632 is the large end, and the other end is the small end. The diameter of the large end is larger than that of the small end. The shape of the arc part 632 gradually changes from the large end to the small end in a variable - cross - section manner. The large end is integrally structured with the bottom of the cylindrical part 631. A first convex block 6311 is provided at the top of the cylindrical part 631, and a second convex block 6321 is provided on the bottom surface of the arc part 632 away from the cylindrical part 631.

[0029] A slider assembly is provided on the active rocker arm 65. The slider assembly can move axially along the active rocker arm 65. One end of the active rocker arm 65 is fixedly connected to the first blade 3 and the linkage ring 5 respectively, and the other end is a free end, which can freely pass through the boss 64 in the axial direction of the outer casing 1. Among them:

[0030] The boss 64 is installed on the outer surface of the engine casing near one end of the air inlet. A support frame 62 is installed on the boss 64, and a hollow area is formed through which one end of the active rocker arm 65 freely passes. A crank 63 is rotatably installed in the central area of the support frame 62. The first convex block 6311 is connected to the motor, and the second convex block 6321 is connected to the slider assembly. Driven by the motor, the driving cylinder 631 rotates, driving the arc-shaped part 632 to rotate through the driving cylinder 631. Driven by the second convex block 6321, the slider assembly reciprocates on the active rocker arm 65, thereby driving the free end of the active rocker arm 65 to swing or rotate around the fixed end of the active rocker arm 65 and the first blade 3, thus driving the first blade 3 to rotate around the outer engine casing 1. At the same time, the linkage ring 5 is driven to rotate.

[0031] Further, the installation method of the slider assembly is as follows:

[0032] The active rocker arm 65 is provided with a through groove 651 of a preset length along the central axis direction. The slider assembly includes a spherical plain bearing, an upper slider 71, and a lower slider 72. The upper slider 71 and the lower slider 72 are provided with mounting holes 73 for installing the spherical plain bearing at corresponding positions.

[0033] As Figure 4 shown, the active rocker arm 65 includes a first part 652, a second part 653, and an arc part 654 arranged in an integral structure. Under the action of the arc part 654, the height of the first part 652 in the vertical direction is higher than that of the second part 653. The through groove 651 is arranged on the first part 652, and the first part 652 freely passes through the top surface of the boss 64.

[0034] The inner ring of the spherical plain bearing is rotatably connected to the second convex block 6321. As Figure 5 shown, the outer ring is installed in the mounting hole 73 of the slider formed after the upper slider 71 and the lower slider 72 are assembled and fixed. The upper slider 71 and the lower slider 72 are symmetrically provided with sliding grooves 74 at corresponding positions. As Figure 6 shown, the sliding grooves 74 are used to slide on both sides of the through groove 651 after the upper slider 71 and the lower slider 72 are assembled and fixed; the second convex block 6321 passes through the through groove 651 and has an extended section.

[0035] When the second convex block 6321 is driven, it drives the upper slider 71 and the lower slider 72 to be assembled and fixed to form a slider that slides in the through groove 651.

[0036] It should be noted that the length of the first part 652 is a preset length, and the preset length is to ensure that the first part 652 will not be separated from the boss 64, ensuring that both the first part 652 and the boss 64 are in contact. Refer to Figure 1 shown, the boss 64 is perpendicular to the boss 64 in the initial state, and the perpendicularity means that the center lines of the two components are perpendicular.

[0037] Further, a rectangular hole 6531 is provided at a position near one end of the second part 653. The rectangular hole 6531 is for one end of the first blade 3 to pass through, and after passing through, it is fixed by a compression nut. A docking member 655 is provided at the end of the second part 653. One end of the docking member 655 is fixed to the linkage ring 5. When the driving rocker arm 65 is driven, it is transmitted to the linkage ring 5 through the docking member 655.

[0038] As a specific implementation manner provided in this case, the driven driving assembly includes a driven rocker arm 8 and a locking member (not shown in the figure), for example, a compression nut, where:

[0039] One end of the second blade 4 extends out of the outer casing 1 and has an extended section. After the extended section of the second blade 4 passes through one end of the driven rocker arm 8, it is fastened by a locking member (preferably, it can be fastened in cooperation with a rubber pad or a sealing ring). The other end of the driven rocker arm 8 is connected to the linkage ring 5;

[0040] When the linkage ring 5 is driven, one end of the driven rocker arm 8 is swung or deflected by the linkage ring 5, and the other end drives the second blade 4 to rotate radially around the outer casing 1, and the deflection angles of the second blade 4 and the first blade 3 are changed synchronously.

[0041] Overall experimental effect:

[0042] a) This structure can be used in the structural design of the inlet flow passage in front of the guide vane of the low-pressure turbine ring blowing test piece and the turbine stage performance test piece. At the same time, this design concept can also be extended to the structure that needs to change the installation angle of the annular cascade on the relevant test pieces of aeroengines;

[0043] b) Driven by an external rotating motor, this structure uses mechanical transmission methods with connecting parts such as a driving rocker arm, a slider, and a crank to transfer the circular motion of the motor to the linkage ring to change the installation angles of all the guide vane blades. The rotation angle is read by an angular displacement sensor installed at the top of the guide vane blade;

[0044] c) By installing a bushing on the rotating shaft of the guide vane blade and a sealing component on the outer casing, it can ensure that the gas in the flow passage does not leak and the guide vane blade rotates normally;

[0045] d) When changing the inlet flow angle, there is no need to remove the stage and replace the guide vane blade. It can be adjusted during the test, greatly improving the efficiency;

[0046] e) This structure is simple, compact, has good manufacturability and processing technology, and is easy to assemble.

[0047] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A flow guiding support plate adjusting structure with variable pre-whirl angle for a turbine performance test piece, applicable to adjusting the blade angle of the flow guiding support plate installed between the inner and outer casings, characterized in that, The flow guiding strut vane includes a first vane and a second vane, and includes an active drive assembly, a linkage ring and a driven drive assembly installed circumferentially on the outer casing. The linkage ring is installed circumferentially on the outer casing, where: The active drive assembly is fixedly connected to the end of the first vane away from the inner casing and the linkage ring respectively, driving the first vane to rotate radially around the outer casing, and driving the linkage ring to rotate circumferentially along the outer casing; The driven drive assembly is connected to the linkage ring and one end of the second vane respectively. When the active drive assembly drives the linkage ring to rotate, driven by the linkage ring, the driven drive assembly drives the second vane to rotate radially around the outer casing, and the rotation angle changes synchronously with that of the first vane. The active drive assembly includes a motor, a support frame, a crank, a boss and an active rocker arm. The crank includes a cylindrical part and an arc part. One end of the arc part is the large end, and the other end is the small end. The diameter of the large end is larger than that of the small end. The shape of the arc part is set in a structure with a variable cross-section gradually changing from the large end to the small end. The large end is integrally structured with the bottom of the cylindrical part. A first convex block is arranged at the top of the cylindrical part, and a second convex block is arranged on the bottom surface of the arc part away from the cylindrical part. A slider assembly is arranged on the active rocker arm. The slider assembly can move axially along the active rocker arm. One end of the active rocker arm is fixedly connected to the first vane and the linkage ring respectively, and the other end is a free end, which can freely pass through the boss in the axial direction of the outer casing. Among them, the boss is installed on the outer surface near one end of the air inlet of the casing, and the support frame is installed on the boss and forms a hollow area through which one end of the active rocker arm freely passes. The crank is installed rotatably in the central area of the support frame. The first convex block is connected to the motor, and the second convex block is connected to the slider assembly; driven by the motor, the cylindrical part is driven to rotate, so as to drive the cylindrical part to drive the arc part to rotate. Driven by the second convex block, the slider assembly reciprocates on the active rocker arm, thereby driving the free end of the active rocker arm to swing or rotate around the fixed end of the active rocker arm and the first vane, thereby driving the first vane to rotate around the outer casing, and at the same time, driving the linkage ring to rotate.

2. The flow guiding support plate adjusting structure according to claim 1, wherein One ends of the first vane and the second vane are installed on the inner casing rotatably, and the other ends extend out of the outer casing and are correspondingly connected to the active drive assembly and the driven drive assembly respectively.

3. The flow guiding support plate adjusting structure according to claim 2, wherein, A through groove with a preset length is arranged along the center direction of the active rocker arm. The slider assembly includes a spherical plain bearing, an upper slider and a lower slider. The upper slider and the lower slider are provided with mounting holes for installing the spherical plain bearing at corresponding positions. The active rocker arm includes a first part, a second part and an arc part which are integrally structured. Under the action of the arc part, the height of the first part in the vertical direction is higher than that of the second part. The through groove is arranged on the first part, and the first part freely passes through the top surface of the boss. The inner ring of the spherical plain bearing is rotatably connected to the second convex block, and the outer ring is installed in the mounting hole of the slider formed after the upper slider and the lower slider are fixedly joined together. The upper slider and the lower slider are symmetrically provided with sliding grooves at corresponding positions. The sliding grooves are used for sliding on both sides of the through groove after the upper slider and the lower slider are fixedly joined together. The second convex block passes through the through groove and has an extended section. When the second convex block is driven, it drives the slider formed by the upper slider and the lower slider fixedly joined together to slide in the through groove.

4. The flow guiding support plate adjusting structure according to claim 3, wherein, A rectangular hole is provided at a position near one end of the second part. The rectangular hole is for one end of the first blade to pass through, and after passing through, it is fixed by a compression nut. A docking member is provided at the end of the second part. One end of the docking member is fixed to the linkage ring. When the driving rocker arm is driven, it is transmitted to the linkage ring through the docking member.

5. The flow guiding support plate adjusting structure according to claim 4, characterized in that, The driven driving assembly includes a driven rocker arm and a locking member, wherein: One end of the second blade extends out of the outer casing and has an extended section. After the extended section of the second blade passes through one end of the driven rocker arm, it is fastened by the locking member. The other end of the driven rocker arm is connected to the linkage ring. When the linkage ring is driven, one end of the driven rocker arm is swung or deflected by the linkage ring, and the other end drives the second blade to rotate radially around the outer casing. Moreover, the deflection angles of the second blade and the first blade change synchronously.

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