Adjustable double-moving-blade tip clearance simulation test device and method for rotor elastic wire reconstruction and fault identification test

Abstract

The application relates to the technical field of aero-engines, and discloses an adjustable double-moving-blade tip clearance simulation test device and method for rotor elastic line reconstruction and fault identification test. The device is designed with double independent driving assemblies. In the rotation process of the rotor, the first driving assembly and the second driving assembly are used to control the axial displacement of the first auxiliary bearing and the second auxiliary bearing respectively, the axial movement of the first auxiliary bearing and the second auxiliary bearing is converted into the radial expansion and contraction of the blade through a connecting rod structure, the two adjustable blades are jointly extended or retracted, the tip clearance of the two adjustable blades is synchronously adjusted, and the extension or retraction of a single adjustable blade is realized, and the tip clearance of the single adjustable blade is adjusted. The application can meet the dynamic adjustment requirement of the tip clearance in the rotor elastic line reconstruction and fault identification test, and can support the rotor dynamics research of rotary turbomachinery.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, and discloses an adjustable dual-blade tip clearance simulation test device and method for rotor elastic line reconstruction and fault identification tests. Background Technology

[0002] Rotor elastic line reconstruction and fault identification tests are important rotor dynamics tests in the research and development of rotating turbomachinery such as aero-engines and gas turbines. In these tests, simulating tip clearance changes is crucial for detecting the system's shaft trajectory, reconstructing the elastic line, simulating rubbing behavior, and diagnosing rubbing fault types. During operation, rotor blades undergo length changes due to rubbing and other factors, thus altering the tip clearance. Traditional simulation methods require disassembling and replacing blade test pieces of different lengths to simulate varying tip clearances. This method cannot achieve continuous tip clearance adjustment or simulate the dynamic changes in tip clearance during rotor rotation. To facilitate the study of the impact of different blade tip clearance changes on rotor dynamic behavior, a test device is needed that allows different blades to independently adjust their elongation during rotor rotation, thereby adjusting the tip clearance. Summary of the Invention

[0003] The purpose of this invention is to provide an adjustable double-blade tip clearance simulation test device and method for rotor elastic line reconstruction and fault identification tests. It can dynamically adjust the extension length of the blades during rotor rotation, thereby realizing the dynamic adjustment and simulation of the tip clearance during the test.

[0004] To achieve the above-mentioned technical effects, the technical solution adopted by the present invention is as follows:

[0005] An adjustable dual-blade tip clearance simulation test device for rotor elastic line reconstruction and fault identification testing includes: Casing; A hollow rotating shaft is located inside a casing; a linear guide structure is provided radially inside the hollow rotating shaft, and a blade window is also provided on the hollow rotating shaft; The blade includes a first adjustable blade and a second adjustable blade. The blade roots of the first adjustable blade and the second adjustable blade are respectively mounted on the slider of the linear guide structure, and the blade tips of the first adjustable blade and the second adjustable blade extend from the corresponding blade window to the outside of the hollow rotating shaft. The transmission mechanism includes a first auxiliary bearing, a second auxiliary bearing, and a connecting rod structure. The connecting rod structure is installed inside a hollow rotating shaft and rotates synchronously with the hollow rotating shaft. The output end of the connecting rod structure is hinged to a first adjustable blade and a second adjustable blade, respectively. The input end of the connecting rod structure is connected to the first auxiliary bearing and the second auxiliary bearing, respectively. The connecting rod structure is used to control the first adjustable blade and / or the second adjustable blade to extend outward or retract inward of the blade window to adjust the tip clearance between the tip of the first adjustable blade and / or the tip of the second adjustable blade and the inner surface of the casing.

[0006] Furthermore, a first sleeve and a second sleeve are fixed to the inner wall of the hollow rotating shaft, and the axes of the first sleeve and the second sleeve are parallel to the axis of the hollow rotating shaft. The linkage structure includes a first guide slider, a second guide slider, a first adjusting link, a second adjusting link, a first control link, and a second control link. The first guide slider is slidably connected to the first sleeve, and the drive input end of the first guide slider is connected to the inner ring of the first auxiliary bearing, while the drive output end of the first guide slider is hinged to the slider hinge end of the first adjusting link. The second guide slider is slidably connected to the second sleeve, and the drive input end of the second guide slider is connected to the inner ring of the second auxiliary bearing, while the drive output end of the second guide slider is hinged to the slider hinge end of the second adjusting link. The blade hinge end of the first control link is hinged to a slider that fixes a first adjustable blade. The blade hinge end of the second control link is hinged to a slider that fixes a second adjustable blade. The composite hinge ends of the first adjusting link, the second adjusting link, the first control link, and the second control link are all hinged together to form a composite hinge.

[0007] Furthermore, the first drive assembly includes a first driver and a first connecting rod; one end of the first connecting rod is connected to the output shaft of the first driver, and the other end of the first connecting rod is connected to the outer ring of the first auxiliary bearing.

[0008] Furthermore, the first drive assembly also includes a first connecting rod, one end of which is connected to a first connecting rod via a universal joint, and the other end of which is connected to the outer ring of the first auxiliary bearing.

[0009] Furthermore, the second drive assembly includes a second driver and a second connecting rod; one end of the second connecting rod is connected to the output shaft of the second driver, and the other end of the second connecting rod is connected to the outer ring of the second auxiliary bearing.

[0010] Furthermore, the second drive assembly also includes a second connecting rod, one end of which is connected to the second connecting rod via a universal joint, and the other end of which is connected to the outer ring of the second auxiliary bearing.

[0011] Furthermore, the second guide slider includes a first rod, a connecting portion, and a second rod; the first rod is slidably connected to the second sleeve, and one end of the first rod is hinged to the slider hinge end of the second adjusting link, and the other end of the first rod is connected to the second rod through the connecting portion; the free end of the second rod is connected to the inner ring of the second auxiliary bearing; the second connecting link passes through the inner ring of the first auxiliary bearing and is connected to the outer ring of the second auxiliary bearing.

[0012] An adjustable double-blade tip clearance simulation test method for rotor elastic line reconstruction and fault identification tests, based on the aforementioned adjustable double-blade tip clearance simulation test device, includes the following steps: The tip gap between the first and second adjustable blades is adjusted to the initial gap value by using the first and second drivers. Start the adjustable double-blade tip clearance simulation test device to make the hollow shaft reach the preset speed; The extension length of the first adjustable blade and / or the second adjustable blade is dynamically adjusted by the first driver and the second driver to adjust the tip gap of the first adjustable blade and / or the second adjustable blade to the set test value.

[0013] Furthermore, when it is necessary to synchronously extend or retract the first and second adjustable blades to a set extension length, the first and second drivers are used to drive the first and second auxiliary bearings to move synchronously along the axial direction of the hollow shaft. The first and second auxiliary bearings drive the composite hinge of the linkage structure to move axially along the hollow shaft. The composite hinge of the linkage structure drives the first and second adjustable blades to move towards each other or synchronously move in opposite directions along the linear slide rail by a set distance, so that the first and second adjustable blades are adjusted to the same set extension length, so that the blade tip gap of the first and second adjustable blades is synchronously adjusted to the set test value.

[0014] Furthermore, when the extension length of the second adjustable blade needs to remain unchanged, and the extension length of the first adjustable blade is adjusted to the set extension length, the first driver and the second driver respectively drive the first auxiliary bearing and the second auxiliary bearing to move axially along the hollow rotating shaft. The first auxiliary bearing and the second auxiliary bearing drive the composite hinge of the linkage structure to move along a preset curve trajectory. The composite hinge of the linkage structure drives the first adjustable blade to adjust to the set extension length, while keeping the second adjustable blade at its original extension length, so that the blade tip clearance of the first adjustable blade is adjusted to the set test value. The preset curve trajectory is an arc trajectory with the hinge axis between the second adjustable blade and the second control linkage as the center and the distance from the composite hinge to the center as the radius.

[0015] Compared with the prior art, the beneficial effects of this invention are: This invention employs a dual independent drive assembly design. The first and second drive assemblies control the axial displacement of the first and second auxiliary bearings, respectively. A connecting rod structure converts the axial movement of the first and second auxiliary bearings into radial extension and retraction of the blades, allowing both adjustable blades to extend or retract simultaneously, achieving synchronous adjustment of the blade tip clearance. Alternatively, it can extend or retract a single adjustable blade, achieving adjustment of its individual blade tip clearance. This invention can meet the dynamic adjustment requirements of blade tip clearance in rotor elastic line reconstruction and fault identification experiments, and can support rotor dynamics research in rotating turbomachinery. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the adjustable double-blade tip clearance simulation test device for rotor elastic line reconstruction and fault identification tests in the embodiment. Figure 2 This is a cross-sectional view of the adjustable double-blade tip clearance simulation test device for rotor elastic line reconstruction and fault identification tests in the embodiment. Figure 3 This is a cross-sectional view of the adjustable double-blade tip clearance simulation test device (without the casing) in the embodiment. Figure 4 This is a schematic diagram illustrating the synchronous extension or retraction of the first and second adjustable blades in the embodiment. Figure 5 This is a schematic diagram of the first adjustable blade extending while the second adjustable blade retracts in an embodiment. Figure 6 This is a schematic diagram of the embodiment where the first adjustable blade retracts while the second adjustable blade remains stationary; Figure 7 This is a flowchart of the adjustable double-blade tip clearance simulation test method for rotor elastic line reconstruction and fault identification tests in the embodiment. Among them, 101-first driver, 102-first connecting rod, 103-first associated connecting rod, 104-second driver, 105-second connecting rod, 106-second associated connecting rod, 201-hollow rotating shaft, 202-blade window, 203-first sleeve, 204-second sleeve, 301-first auxiliary bearing, 302-second auxiliary bearing, 303-first guide slider, 304-second guide slider, 3041-first rod, 3042-connecting part, 3043-second rod, 305-first adjusting connecting rod, 306-second adjusting connecting rod, 401-first adjustable blade, 402-first control connecting rod, 403-second control connecting rod, 404-second adjustable blade, 501-casing. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the above-described subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0018] See Figures 1 to 6 This invention provides an adjustable dual-blade tip clearance simulation test device for rotor elastic line reconstruction and fault identification testing, comprising: Casing 501; A hollow rotating shaft 201 is located inside the housing 501; a linear guide structure is provided radially inside the hollow rotating shaft 201, and a blade window 202 is also provided on the hollow rotating shaft 201, the blade window 202 being arranged at the end corresponding to the linear guide structure. The blade includes a first adjustable blade 401 and a second adjustable blade 404. The blade roots of the first adjustable blade 401 and the second adjustable blade 404 are respectively mounted on the slider of the linear guide structure, and the blade tips of the first adjustable blade 401 and the second adjustable blade 404 extend from the corresponding blade window 202 to the outside of the hollow rotating shaft 201. The transmission mechanism includes a first auxiliary bearing 301, a second auxiliary bearing 302, and a connecting rod structure. The connecting rod structure is installed inside the hollow rotating shaft 201 and rotates synchronously with the hollow rotating shaft 201. The output end of the connecting rod structure is hinged to the first adjustable blade 401 and the second adjustable blade 404, respectively. The input end of the connecting rod structure is connected to the first auxiliary bearing 301 and the second auxiliary bearing 302, respectively. The connecting rod structure is used to control the first adjustable blade 401 and / or the second adjustable blade 404 to extend outward or retract inward into the blade window 202, so as to adjust the tip clearance between the tip of the first adjustable blade 401 and / or the tip of the second adjustable blade 404 and the inner surface of the casing 501. The driving mechanism includes a first driving component and a second driving component; the first driving component is connected to a first auxiliary bearing 301 and is used to drive the first auxiliary bearing 301 to move axially along the hollow rotating shaft 201; the second driving component is connected to a second auxiliary bearing 302 and is used to drive the second auxiliary bearing 302 to move axially along the hollow rotating shaft 201.

[0019] See Figure 7 The present invention also provides an adjustable double-blade tip clearance simulation test method for rotor elastic line reconstruction and fault identification tests, based on the aforementioned adjustable double-blade tip clearance simulation test device, including the following steps: The tip gap between the first adjustable blade 401 and the second adjustable blade 404 is adjusted to the initial gap value by the first driver 101 and the second driver 104. Start the adjustable double-blade tip clearance simulation test device to make the hollow rotating shaft 201 reach the preset speed; The extension length of the first adjustable blade 401 and / or the second adjustable blade 404 is dynamically adjusted by the first driver 101 and the second driver 104 to adjust the tip gap of the first adjustable blade 401 and / or the second adjustable blade 404 to the set test value.

[0020] This invention employs a dual independent drive assembly design. During rotor rotation, the first and second drive assemblies respectively control the axial displacement of the first auxiliary bearing 301 and the second auxiliary bearing 302. A connecting rod structure converts the axial movement of the first and second auxiliary bearings 301 and 302 into radial extension and retraction of the blades, allowing both adjustable blades to extend or retract simultaneously, achieving synchronous adjustment of the blade tip clearance. Alternatively, the extension or retraction of a single adjustable blade can be used to adjust its tip clearance. This invention can meet the dynamic tip clearance adjustment requirements in rotor elastic line reconstruction and fault identification experiments, and can support rotor dynamics research in rotating impeller machinery.

[0021] Example This embodiment further elaborates on the adjustable double-blade tip clearance simulation test device for rotor elastic line reconstruction and fault identification tests, as detailed below.

[0022] See Figures 1 to 6 An adjustable double-blade tip clearance simulation test device for rotor elastic line reconstruction and fault identification tests includes a casing 501, a hollow rotating shaft 201, blades, a transmission mechanism and a drive mechanism.

[0023] like Figure 1 and Figure 2As shown, the casing 501 can be a compressor casing or a turbine component casing. The hollow shaft 201 is located inside the casing 501, and a linear guide structure is provided radially inside the hollow shaft 201. In this embodiment, the linear guide structure adopts a linear slide rail. The hollow shaft 201 is also provided with two blade windows 202, which are respectively arranged at the ends of the linear slide rail. Moreover, the outer wall of the hollow shaft 201 is connected to the shaft support seat through two bearings, and the type of bearing can be determined according to the test requirements. The hollow shaft 201 can be connected to an external motor through gear transmission or other transmission methods to achieve the required rotational speed for the test. A first sleeve 203 and a second sleeve 204 are fixed on the inner wall of the hollow shaft 201, and the axes of the first sleeve 203 and the second sleeve 204 are parallel to the axis of the hollow shaft 201. It should be noted that... Figure 1 and Figure 2 The casing 501 in the diagram is for structural illustration only. When implementing this test apparatus, those skilled in the art can use a compressor casing or a turbine component casing for the casing 501.

[0024] The blades include a first adjustable blade 401 and a second adjustable blade 404. The blade roots of the first adjustable blade 401 and the second adjustable blade 404 are respectively slidably mounted on two sliders of the linear slide rail, and the blade tips of the first adjustable blade 401 and the second adjustable blade 404 respectively extend from the corresponding blade window 202 to the outside of the hollow rotating shaft 201.

[0025] The gap between the blade tip and the inner surface of the casing 501 is the blade tip gap. In this embodiment, a transmission mechanism and a drive mechanism are used to control the two sliders of the linear slide rail to slide in opposite directions, causing the first adjustable blade 401 and the second adjustable blade 404 to extend outwards from the hollow rotating shaft 201 simultaneously, thereby simultaneously reducing the blade tip gap of the first adjustable blade 401 and the second adjustable blade 404. Alternatively, the transmission mechanism and the drive mechanism are used to control the two sliders of the linear slide rail to slide towards each other, causing the first adjustable blade 401 and the second adjustable blade 404 to retract inwards from the hollow rotating shaft 201 simultaneously, thereby simultaneously increasing the blade tip gap of the first adjustable blade 401 and the second adjustable blade 404, thus achieving synchronous adjustment of the blade tip gap of the two adjustable blades. Furthermore, in this embodiment, the transmission mechanism and the drive mechanism can also be used to control the sliding of any one slider on the linear slide rail while keeping the other slider stationary, to independently control the extension or retraction of the first adjustable blade 401 or the second adjustable blade 404, thereby achieving adjustment of the blade tip gap of a single adjustable blade.

[0026] like Figure 2 and Figure 3As shown, the transmission mechanism includes a first auxiliary bearing 301, a second auxiliary bearing 302, and a connecting rod structure. The connecting rod structure is installed inside the hollow rotating shaft 201 and includes a first guide slider 303, a second guide slider 304, a first adjusting connecting rod 305, a second adjusting connecting rod 306, a first control connecting rod 402, and a second control connecting rod 403. The first guide slider 303 is slidably connected to the first sleeve 203, forming a sliding pair that constrains the first guide slider 303 to move along the axial direction of the hollow rotating shaft 201. A tapered cylindrical component is fixed to the drive input end of the first guide slider 303, which is connected to the inner ring of the first auxiliary bearing 301. The drive output end of the first guide slider 303 is hinged to the slider hinge end of the first adjusting connecting rod 305, forming a hinge point O1. The second guide slider 304 includes a first rod 3041, a connecting part 3042, and a second rod 3043. The first rod 3041 is slidably connected to the second sleeve 204 to form a sliding pair, which constrains the second guide slider 304 to move along the axial direction of the hollow rotating shaft 201. One end of the first rod 3041 is hinged to the slider hinge end of the second adjusting connecting rod 306 to form a hinge point O2, and the other end of the first rod 3041 is connected to the second rod 3043 through the connecting part 3042. The free end of the second rod 3043 is connected to the inner ring of the second auxiliary bearing 302. In this embodiment, the connecting part 3042 is a rod, and the second guide slider 304 is Z-shaped overall. The blade hinge end of the first control link 402 is hinged to the slider on which the first adjustable blade 401 is mounted, forming hinge point O3; the blade hinge end of the second control link 403 is hinged to the slider on which the second adjustable blade 404 is mounted, forming hinge point O4. The composite hinge ends of the first adjustment link 305, the second adjustment link 306, the first control link 402, and the second control link 403 are hinged together to form a composite hinge, and simultaneously form composite hinge point O5.

[0027] In this embodiment, the first guide slider 303, the second guide slider 304, the first adjusting link 305, the second adjusting link 306, and the hollow rotating shaft 201 form a first closed-loop five-bar linkage with two degrees of freedom. The first guide slider 303 and the second guide slider 304 serve as the two inputs to the first closed-loop five-bar linkage, and their positions jointly determine the position of the compound hinge point O5 within the hollow rotating shaft 201. The first control link 402 and the second control link 403 are simultaneously hinged at the compound hinge point O5, forming a compound hinge. The first control link 402, the second control link 403, the first adjustable blade 401, the second adjustable blade 404, and the hollow rotating shaft 201 form a second closed-loop five-bar linkage with two degrees of freedom. The input to the second closed-loop five-bar linkage is the axial position of the compound hinge point O5 within the hollow rotating shaft 201, and the output is the radial position of the first adjustable blade 401 and the second adjustable blade 404 within the hollow rotating shaft 201. The first guide slider 303 and the second guide slider 304, through the aforementioned two closed-loop five-bar linkages, enable the first adjustable blade 401 and the second adjustable blade 404 to extend and retract together or independently, as shown below. Figure 4 , Figure 5 As shown.

[0028] In this embodiment, due to the constraints of the first sleeve 203, the second sleeve 204, and the linear guide rail, the connecting rod structure rotates synchronously with the hollow rotating shaft 201 when the hollow rotating shaft 201 rotates. Furthermore, the first auxiliary bearing 301 and the second auxiliary bearing 302 are bearings capable of simultaneously bearing radial and axial loads, such as deep groove ball bearings and four-point contact ball bearings. The first auxiliary bearing 301 and the second auxiliary bearing 302 can transmit axial motion but cannot transmit circumferential motion. The first auxiliary bearing 301 and the second auxiliary bearing 302 can transmit the movement of the first connecting rod 103 and the second connecting rod 106 in the axial direction of the hollow rotating shaft 201 to the first guide slider 303 and the second guide slider 304. However, the rotational movement of the first guide slider 303 and the second guide slider 304 following the rotation of the hollow rotating shaft 201 cannot be transmitted to the first connecting rod 103 and the second connecting rod 106 through the first auxiliary bearing 301 and the second auxiliary bearing 302. This effectively isolates the influence of the rotational movement of the hollow rotating shaft 201 on the drive assembly and the axial movement of the first auxiliary bearing 301 and the second auxiliary bearing 302, so as to realize the dynamic adjustment of the blade tip clearance during the high-speed rotation of the hollow rotating shaft 201.

[0029] The drive mechanism includes a first drive assembly and a second drive assembly. The first drive assembly includes a first driver 101, a first connecting rod 102, and a first associated connecting rod 103. One end of the first connecting rod 102 is connected to the output shaft of the first driver 101 via a universal joint, and the other end of the first connecting rod 102 is connected to the first associated connecting rod 103 via a universal joint. The first associated connecting rod 103 is then connected to the outer ring of the first auxiliary bearing 301. It should be noted that the universal joint between the first connecting rod 102 and the first driver 101 is used to limit the axial rotation and three-degree-of-freedom spatial movement of the output shaft of the first driver 101 relative to the first connecting rod 102. The universal joint between the first connecting rod 102 and the first associated connecting rod 103 is used to limit the axial rotation and three-degree-of-freedom spatial movement of the first connecting rod 102 relative to the first associated connecting rod 103.

[0030] The second drive assembly includes a second driver 104, a second connecting rod 105, and a second associated connecting rod 106. One end of the second connecting rod 105 is connected to the output shaft of the second driver 104 via a universal joint, and the other end of the second connecting rod 105 is connected to the second associated connecting rod 106 via a universal joint. The second associated connecting rod 106 is then connected to the outer ring of the second auxiliary bearing 302. The first driver 101 and the second driver 104 can be driven devices capable of linear motion, such as linear motors or hydraulic actuators. It should be noted that both the first driver 101 and the second driver 104 can be linear drive devices such as linear motors or hydraulic cylinders. Both the first driver 101 and the second driver 104 are fixed to an external foundation, which can be a fixed frame. The universal joint between the second connecting rod 105 and the second driver 104 is used to limit the axial rotation and three-degree-of-freedom spatial movement of the output shaft of the second driver 104 relative to the second connecting rod 105. The universal joint between the second connecting rod 106 and the second connecting rod 105 is used to restrict the axial rotation and three-degree-of-freedom spatial movement of the second connecting rod 105 relative to the second connecting rod 106.

[0031] In the experiment, the linear motion of the output shafts of the first driver 101 and the second driver 104 drives the first auxiliary bearing 301 and the second auxiliary bearing 302 to move axially along the hollow rotating shaft 201. Then, through the linkage structure, the axial movement of the first auxiliary bearing 301 and the second auxiliary bearing 302 is converted into the radial movement of the slider on the linear slide rail along the hollow rotating shaft 201. Thus, during the rotation of the hollow rotating shaft 201, the first adjustable blade 401 and / or the second adjustable blade 404 are controlled to extend outward or retract inward into the blade window 202 to dynamically adjust the tip clearance of the first adjustable blade 401 and / or the second adjustable blade 404.

[0032] The present invention uses a drive assembly and a transmission mechanism to convert the linear displacement of the output shafts of the first driver 101 and the second driver 104 along the axial direction of the hollow rotating shaft 201 into the radial displacement of the two rotating blades along the hollow rotating shaft 201, thereby realizing dynamic control of the tip gap of the first adjustable blade 401 and / or the second adjustable blade 404 during the high-speed movement of the hollow rotating shaft 201.

[0033] It should be noted that during the experiment, the adjustable double-blade tip gap simulation test device can be equipped with a tip gap monitoring system to detect the tip gap, or a position sensor can be set to detect the radial position of the first adjustable blade 401 relative to the hollow rotating shaft 201 and the radial position of the second adjustable blade 404 relative to the hollow rotating shaft 201.

[0034] Based on the same inventive concept, see Figure 7 This embodiment also provides an adjustable dual-blade tip clearance simulation test method for rotor elastic line reconstruction and fault identification tests, including the following steps: Step 1: Initialize settings. Using the first driver 101 and the second driver 104, adjust the tip gap of the first adjustable blade 401 and the second adjustable blade 404 to the initial gap value. Step 2: Start the motor of the adjustable double-acting blade tip clearance simulation test device to make the hollow rotating shaft 201 reach the preset speed; Step 3: According to the test requirements, the extension length of the first adjustable blade 401 and / or the second adjustable blade 404 is dynamically adjusted by the first driver 101 and the second driver 104 to adjust the tip clearance of the first adjustable blade 401 and / or the second adjustable blade 404 to the set test value. The extension length refers to the length of the adjustable blade extending outside the hollow rotating shaft 201.

[0035] It should be noted that, as Figure 4 As shown, when it is necessary to synchronously extend or retract the first adjustable blade 401 and the second adjustable blade 404 to a set extension length, the first driver 101 and the second driver 104 respectively drive the first auxiliary bearing 301 and the second auxiliary bearing 302 to move synchronously along the axial direction of the hollow rotating shaft 201. The first auxiliary bearing 301 and the second auxiliary bearing 302 drive the composite hinge point O5 of the connecting rod structure to move axially along the hollow rotating shaft 201. The composite hinge point O5 of the connecting rod structure drives the first adjustable blade 401 and the second adjustable blade 404 to move towards each other or synchronously move a set distance in opposite directions along the linear slide rail, so that the first adjustable blade 401 and the second adjustable blade 404 synchronously extend or retract to the same set extension length, so that the blade tip gap of the first adjustable blade 401 and the second adjustable blade 404 is synchronously adjusted to the set test value. Figures 4 to 6Solid lines indicate the position of each component after adjustment, while dashed lines indicate the position of each component before adjustment.

[0036] like Figure 4 As shown, when it is necessary to retract the first adjustable blade 401 to the first set extension length and simultaneously extend the second adjustable blade 404 to the second set extension length, the first driver 101 and the second driver 104 respectively drive the first auxiliary bearing 301 and the second auxiliary bearing 302 to move synchronously along the axial direction of the hollow rotating shaft 201. The first auxiliary bearing 301 and the second auxiliary bearing 302 drive the composite hinge point O5 of the connecting rod structure to move. The composite hinge point O5 of the connecting rod structure drives the first adjustable blade 401 and the second adjustable blade 404 to move a set distance in the same direction along the linear slide rail, so that the first adjustable blade 401 retracts to the first set extension length and the second adjustable blade 404 extends to the second set extension length, so that the blade tip clearance of the first adjustable blade 401 is adjusted to the first set test value, and the blade tip clearance of the second adjustable blade 404 is simultaneously adjusted to the second set test value.

[0037] like Figure 6 As shown, when the extension length of the second adjustable blade 404 needs to remain unchanged, and the extension length of the first adjustable blade 401 is adjusted to the set extension length, the first driver 101 and the second driver 104 respectively drive the first auxiliary bearing 301 and the second auxiliary bearing 302 to move axially along the hollow rotating shaft 201. The first auxiliary bearing 301 and the second auxiliary bearing 302 drive the composite hinge point O5 of the connecting rod structure to move along a preset curved trajectory. The composite hinge point O5 of the connecting rod structure drives the first adjustable blade 401 to extend or retract a set distance along the linear slide rail, so that the first adjustable blade 401 is adjusted to the set extension length, while the second adjustable blade 404 maintains its original extension length, so that the blade tip clearance of the first adjustable blade 401 is adjusted to the set test value. The preset curved trajectory is an arc trajectory with the hinge axis between the second adjustable blade 404 and the second control connecting rod 403 as the center and the distance from the composite hinge to the center as the radius. When the extension length of the first adjustable blade 401 needs to remain unchanged, and the extension length of the second adjustable blade 404 is adjusted to the set extension length, the adjustment method is the same.

[0038] It should be noted that in traditional rotor dynamics tests, it is difficult to directly adjust the blade tip clearance on the test apparatus. This is typically only possible in actual engines or gas turbines, and the clearance is adjusted by controlling the thermal deformation of the material. This control method, because it requires changing the material temperature, is not only slow in response and difficult to control, but also unsuitable for rotor dynamics tests. This invention adjusts the blade tip clearance by controlling the length of the rotor blades extending beyond the hollow shaft using a linkage structure. Compared to existing technologies, this method offers a faster response and is more suitable for use in rotor dynamics test equipment.

[0039] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An adjustable double-blade tip clearance simulation test device for rotor elastic line reconstruction and fault identification testing, characterized in that, include: Casing (501); A hollow rotating shaft (201) is located inside a casing (501); a linear guide structure is provided radially inside the hollow rotating shaft (201), and a blade window (202) is also provided on the hollow rotating shaft (201); The blade includes a first adjustable blade (401) and a second adjustable blade (404), the blade roots of the first adjustable blade (401) and the second adjustable blade (404) are respectively mounted on the slider of the linear guide structure, and the blade tips of the first adjustable blade (401) and the second adjustable blade (404) extend from the corresponding blade window (202) to the outside of the hollow rotating shaft (201); The transmission mechanism includes a first auxiliary bearing (301), a second auxiliary bearing (302), and a connecting rod structure. The connecting rod structure is installed inside the hollow rotating shaft (201) and rotates synchronously with the hollow rotating shaft (201). The output end of the connecting rod structure is hinged to the first adjustable blade (401) and the second adjustable blade (404) respectively. The input end of the connecting rod structure is connected to the first auxiliary bearing (301) and the second auxiliary bearing (302) respectively. The connecting rod structure is used to control the first adjustable blade (401) and / or the second adjustable blade (404) to extend outward or retract inward into the blade window (202) to adjust the tip clearance between the tip of the first adjustable blade (401) and / or the tip of the second adjustable blade (404) and the inner surface of the casing (501). The driving mechanism includes a first driving component and a second driving component; the first driving component is connected to a first auxiliary bearing (301) and is used to drive the first auxiliary bearing (301) to move axially along the hollow shaft (201); the second driving component is connected to a second auxiliary bearing (302) and is used to drive the second auxiliary bearing (302) to move axially along the hollow shaft (201). The hollow rotating shaft (201) has a first sleeve (203) and a second sleeve (204) fixed on its inner wall. The axes of the first sleeve (203) and the second sleeve (204) are parallel to the axis of the hollow rotating shaft (201). The linkage structure includes a first guide slider (303), a second guide slider (304), a first adjusting link (305), a second adjusting link (306), a first control link (402), and a second control link (403); the first guide slider (303) is slidably connected to the first sleeve (203), and the drive input end of the first guide slider (303) is connected to the inner ring of the first auxiliary bearing (301), and the drive output end of the first guide slider (303) is hinged to the slider hinge end of the first adjusting link (305); the second guide slider (304) is slidably connected to the second sleeve (204), and the second guide slider (304) is slidably connected to the second sleeve (204), and the second guide slider (304) is slidably connected to the second sleeve (204), and the second guide slider (304) is slidably connected to the second sleeve (204). The drive input end of the first control link (402) is connected to the inner ring of the second auxiliary bearing (302), and the drive output end of the second guide slider (304) is hinged to the slider hinge end of the second adjusting link (306); the blade hinge end of the first control link (402) is hinged to the slider that fixes the first adjustable blade (401); the blade hinge end of the second control link (403) is hinged to the slider that fixes the second adjustable blade (404); the composite hinge end of the first adjusting link (305), the composite hinge end of the second adjusting link (306), the composite hinge end of the first control link (402), and the composite hinge end of the second control link (403) are hinged together to form a composite hinge.

2. The adjustable double-blade tip clearance simulation test device according to claim 1, characterized in that, The first drive assembly includes a first driver (101) and a first connecting rod (102); one end of the first connecting rod (102) is connected to the output shaft of the first driver (101), and the other end of the first connecting rod (102) is connected to the outer ring of the first auxiliary bearing (301).

3. The adjustable double-blade tip clearance simulation test device according to claim 2, characterized in that, The first drive assembly also includes a first connecting rod (103), one end of which is connected to the first connecting rod (102) via a universal joint, and the other end of which is connected to the outer ring of the first auxiliary bearing (301).

4. The adjustable double-blade tip clearance simulation test device according to claim 3, characterized in that, The second drive assembly includes a second driver (104) and a second connecting rod (105); one end of the second connecting rod (105) is connected to the output shaft of the second driver (104), and the other end of the second connecting rod (105) is connected to the outer ring of the second auxiliary bearing (302).

5. The adjustable double-blade tip clearance simulation test device according to claim 4, characterized in that, The second drive assembly also includes a second connecting rod (106), one end of which is connected to the second connecting rod (105) via a universal joint, and the other end of which is connected to the outer ring of the second auxiliary bearing (302).

6. The adjustable double-blade tip clearance simulation test device according to claim 5, characterized in that, The second guide slider (304) includes a first rod (3041), a connecting part (3042), and a second rod (3043); the first rod (3041) is slidably connected to the second sleeve (204), and one end of the first rod (3041) is hinged to the slider hinge end of the second adjusting link (306), and the other end of the first rod (3041) is connected to the second rod (3043) through the connecting part (3042); the free end of the second rod (3043) is connected to the inner ring of the second auxiliary bearing (302); the second associated link (106) passes through the inner ring of the first auxiliary bearing (301) and is connected to the outer ring of the second auxiliary bearing (302).

7. A method for simulating the tip clearance of adjustable double-bladed rotors for rotor elastic line reconstruction and fault identification testing, based on the adjustable tip clearance simulation test device according to any one of claims 1-6, characterized in that, Includes the following steps: The tip gap of the first adjustable blade (401) and the second adjustable blade (404) are adjusted to the initial gap value by the first driver (101) and the second driver (104); Start the adjustable double-blade tip clearance simulation test device to make the hollow rotating shaft (201) reach the preset speed; The extension length of the first adjustable blade (401) and / or the second adjustable blade (404) is dynamically adjusted by the first driver (101) and the second driver (104) to adjust the tip gap of the first adjustable blade (401) and / or the second adjustable blade (404) to the set test value.

8. The method for simulating the tip gap of adjustable double-moving blades according to claim 7, characterized in that, When it is necessary to synchronously extend or retract the first adjustable blade (401) and the second adjustable blade (404) to a set extension length, the first driver (101) and the second driver (104) respectively drive the first auxiliary bearing (301) and the second auxiliary bearing (302) to move synchronously along the axial direction of the hollow rotating shaft (201). The first auxiliary bearing (301) and the second auxiliary bearing (302) drive the composite hinge of the linkage structure to move axially along the hollow rotating shaft (201). The composite hinge of the linkage structure drives the first adjustable blade (401) and the second adjustable blade (404) to move towards each other or synchronously move in opposite directions a set distance along the linear slide rail, so that the first adjustable blade (401) and the second adjustable blade (404) are adjusted to the same set extension length, so that the blade tip clearance of the first adjustable blade (401) and the second adjustable blade (404) is synchronously adjusted to the set test value.

9. The method for simulating the tip gap of adjustable double-moving blades according to claim 7, characterized in that, When the extension length of the second adjustable blade (404) needs to remain unchanged, and the extension length of the first adjustable blade (401) is adjusted to the set extension length, the first driver (101) and the second driver (104) drive the first auxiliary bearing (301) and the second auxiliary bearing (302) to move axially along the hollow rotating shaft (201) respectively. The first auxiliary bearing (301) and the second auxiliary bearing (302) drive the composite hinge of the linkage structure to move along the preset curve trajectory. The composite hinge of the linkage structure drives the first adjustable blade (401) to adjust to the set extension length, while keeping the second adjustable blade (404) at its original extension length, so that the blade tip clearance of the first adjustable blade (401) is adjusted to the set test value. The preset curve trajectory is an arc trajectory with the hinge axis of the second adjustable blade (404) and the second control link (403) as the center and the distance from the compound hinge to the center as the radius.

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