Vibration fatigue testing apparatus

Abstract

The application discloses a vibration fatigue test device for fatigue test of an adjustable stator blade, wherein the adjustable stator blade has an outer shaft neck and an inner shaft neck, and the vibration fatigue test device comprises: a first clamping assembly for clamping the outer shaft neck; and a second clamping assembly having a clamping hole for clamping the inner shaft neck, wherein the clamping hole has a variable radial dimension in the height direction. The vibration fatigue test device clamps and fixes the outer shaft neck and the inner shaft neck of the adjustable stator blade respectively, is closer to the real installation boundary of the engine, and is more in line with the stress distribution on the blade body in the vibration test process and the whole machine test running state, so that the fatigue test result is more accurate and reliable. In addition, the clamping hole for clamping the inner shaft neck is arranged to have a variable radial dimension in the height direction, so that the clamping and fixing effect is improved, and the inner shaft neck cannot be fixed or the fixing effect is poor due to the installation error of the outer shaft neck is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to a vibration fatigue test device. BACKGROUND

[0002] The engine stator blade is an extremely important part in the compressor of an aero-engine, mainly used for changing the direction of airflow and improving the compression efficiency, and its performance directly relates to the advantages and disadvantages of the engine performance and safety. Since the stator blade works for a long time in a high-temperature and high-pressure harsh environment, blade failure and fracture are inevitable. Vibration fatigue fracture accounts for a large proportion in blade failure and is one of the main factors affecting the reliability of the engine.

[0003] At present, the design of the fatigue test fixture for the traditional engine stator blade is relatively mature, but there are few fixtures for adjustable stator blades. In the few fixtures for adjustable stator blades, only one end of the adjustable stator blade is usually clamped, which makes it difficult to simulate the real installation boundary of the engine adjustable stator blade, and the vibration fatigue limit and fatigue life test are inaccurate. In the few fixtures, the two ends of the adjustable stator blade are clamped, and when one end of the adjustable stator blade is fixed, the other end often deviates in height due to installation errors, which makes it difficult to fix or the fixing effect is poor. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the poor clamping effect of the fixture device for the adjustable stator blade in the prior art, and to provide a vibration fatigue test device.

[0005] The present application solves the above technical problems by the following technical solutions:

[0006] A vibration fatigue test device for fatigue test of an adjustable stator blade, the adjustable stator blade having an outer journal and an inner journal, the vibration fatigue test device comprising:

[0007] A first clamping assembly for clamping the outer journal;

[0008] A second clamping assembly having a clamping hole for clamping the inner journal, the clamping hole having a variable radial dimension along the height direction.

[0009] In the scheme, the vibration fatigue test device clamps and fixes the outer shaft neck and the inner shaft neck of the adjustable stator blade respectively, is closer to the real installation boundary of the engine, the stress distribution on the blade body of the adjustable stator blade in the vibration test process is more consistent with the whole machine test running state, and the fatigue test result is more accurate and reliable; and the clamping hole for clamping the inner shaft neck is arranged to have a variable radial size in the height direction, so that the inner shaft neck cannot be fixed or the fixing effect is poor due to the installation error of the outer shaft neck is avoided, so that the clamping and fixing effect of the vibration fatigue test device is improved.

[0010] Preferably, the first clamping assembly comprises a first fastener, a first upper clamping piece and a first lower clamping piece.

[0011] The first upper clamping piece and the first lower clamping piece are formed with a containing cavity for containing the outer shaft neck, and the first fastener is used for tightly fixing the first upper clamping piece and the first lower clamping piece.

[0012] In the scheme, the clamping and fixing mode of the split body is adopted, so that the test efficiency is improved.

[0013] Preferably, the first clamping assembly further comprises a clamping seat, one side of the clamping seat is provided with an open containing cavity, the first upper clamping piece and the first lower clamping piece are located in the containing cavity, and the first fastener is connected to the clamping seat and tightly presses the first upper clamping piece and the first lower clamping piece to the inner wall of the clamping seat.

[0014] In the scheme, the first fastener tightly presses the first upper clamping piece and the first lower clamping piece to the inner wall of the clamping seat, so that the outer shaft neck arranged between the first upper clamping piece and the first lower clamping piece is clamped. Since the containing cavity radially restrains the first upper clamping piece and the first lower clamping piece in the cavity, the first upper clamping piece and the first lower clamping piece will not be separated due to excessive clamping force, and the clamping effect is good.

[0015] Preferably, the clamping seat has a threaded hole extending from the surface of the clamping seat to the containing cavity, the first fastener is screwed in the threaded hole, and one end of the first fastener abuts against the surface of the first upper clamping piece close to the first fastener.

[0016] In the scheme, the first fastener is screwed in the threaded hole, so that the first fastener can be easily screwed in or out to realize clamping or disassembly.

[0017] Preferably, the outer contour of the first upper clamping piece and the first lower clamping piece in the clamping state matches the containing cavity, and the cross-sectional shape of the first upper clamping piece and the first lower clamping piece in the clamping state is polygonal.

[0018] In the scheme, the first upper clamping member and the first lower clamping member are prevented from rotating after being subjected to the reaction force, and the clamping and fixing effect is improved.

[0019] Preferably, the polygon is a rectangle, and the rectangle is arranged obliquely, and an oblique angle of the rectangle matches a torsion angle of the adjustable stator blade.

[0020] In the scheme, the torsion angle is an angle between the outer shaft diameter and the blade body. The blade body of the adjustable stator blade is approximately parallel to the horizontal plane, the excitation force of the vibration table is reduced, and the power consumption of the test equipment is saved. Meanwhile, the obliquely arranged accommodating hole facilitates disassembly and assembly of the first upper clamping member and the first lower clamping member, and the test efficiency is improved.

[0021] Preferably, the surface of the clamping seat is provided with an inclined surface, one side of the rectangle is arranged in parallel with the inclined surface, and the threaded hole is arranged in the inclined surface, and the extension direction of the threaded hole is perpendicular to the inclined surface.

[0022] In the scheme, the first fastener is facilitated to be pressed in the first upper clamping member in the forward direction, the pressing effect is improved, and a plurality of first fasteners with the same specification are also facilitated to be arranged in the inclined surface.

[0023] Preferably, the first upper clamping member and the first lower clamping member each have a fitting surface, the fitting surfaces enclose the accommodating cavity, and the fitting surfaces are used to fit the outer circumferential surface of the outer shaft neck.

[0024] In the scheme, the fitting surface increases the contact area of the first upper clamping member and the first lower clamping member with the outer shaft neck, correspondingly increases the friction, and improves the clamping and fixing effect.

[0025] Preferably, the outer circumferential surface of the outer shaft neck has an outwardly protruding positioning shaft shoulder, the first clamping assembly further includes a fixing member, the fixing member is detachably connected to the end portion of the outer shaft neck, and the fixing member presses one end surface of the first upper clamping member and one end surface of the first lower clamping member against the positioning shaft shoulder.

[0026] In the scheme, the fixing member presses the outer shaft neck against the end surface of the first upper clamping member and the first lower clamping member in the axial direction, avoids the possibility that the blade may move during the vibration test due to insufficient friction of the contact surface, makes the clamping state of the blade more stable during the test, and improves the test effect.

[0027] Preferably, the accommodating cavity penetrates through the clamping seat in the axial direction of the adjustable stator blade.

[0028] In the scheme, the fixing member, the first upper clamping member and the first lower clamping member can be detachably assembled from both ends of the accommodating cavity without being restricted by the space of the accommodating cavity.

[0029] Preferably, the second clamping assembly comprises a second fastener, a second upper clamping piece and a second lower clamping piece, the second fastener is connected to the second lower clamping piece through the second upper clamping piece, and the second upper clamping piece and the second lower clamping piece are formed with the clamping hole.

[0030] In the present solution, the second upper clamping piece is pressed on the second lower clamping piece by the second fastener, so as to clamp the inner journal arranged between the second upper clamping piece and the second lower clamping piece, which is simple in structure, convenient to disassemble and assemble, and improves the test efficiency.

[0031] Preferably, the lower surface of the second upper clamping piece is provided with a clamping groove, and the inner diameter of the clamping groove gradually decreases from bottom to top.

[0032] Preferably, the upper surface of the second lower clamping piece is provided with a clamping groove, and the inner diameter of the clamping groove gradually increases from bottom to top.

[0033] In the present solution, the clamping groove can be arranged on the second upper clamping piece, or on the second lower clamping piece, or both the second upper clamping piece and the second lower clamping piece are provided with the clamping groove, and the clamping groove has a variable radial dimension in the height direction, which avoids the situation that the inner journal cannot be fixed or the fixing effect is poor due to the installation error of the outer journal, so as to improve the clamping and fixing effect of the vibration fatigue test device.

[0034] Preferably, the lower surface of the second upper clamping piece is provided with an upper V-shaped groove, the upper surface of the second lower clamping piece is provided with a lower V-shaped groove, and the upper V-shaped groove and the lower V-shaped groove are oppositely arranged to form the clamping hole.

[0035] In the present solution, the V-shaped groove is convenient for adapting to the inner journal with different diameters, improves the adaptation range, and is also convenient for processing and manufacturing.

[0036] Preferably, the vibration fatigue test device further comprises a base, and the lower ends of the first clamping assembly and the second clamping assembly are connected to the base and are arranged on the upper surface of the base in a spaced manner.

[0037] In the present solution, the base fixes the first clamping assembly and the second clamping assembly to form a whole, which improves the vibration test effect. The base is used to be connected and fixed with the vibration table surface.

[0038] On the basis of the common knowledge in the art, the above-mentioned various preferred conditions can be combined arbitrarily, that is, the preferred examples of the present application are obtained.

[0039] The positive progress effect of the application is that the vibration fatigue test device clamps and fixes the outer shaft neck and the inner shaft neck of the adjustable stator blade respectively, is closer to the real installation boundary of the engine, the stress distribution on the blade body of the adjustable stator blade in the vibration test process is more consistent with the whole machine test running state, and the fatigue test result is more accurate and reliable; and the clamping hole for clamping the inner shaft neck is arranged to have a variable radial size in the height direction, so that the situation that the inner shaft neck cannot be fixed or the fixing effect is poor due to the installation error of the outer shaft neck is avoided, and the clamping and fixing effect of the vibration fatigue test device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 The vibration fatigue test device of a preferred embodiment of the application is a structure schematic view.

[0041] Figure 2 The adjustable stator blade and the first upper clamping piece and the first lower clamping piece of a preferred embodiment of the application are structure schematic views.

[0042] Figure 3 The adjustable stator blade and the first clamping assembly of a preferred embodiment of the application are structure schematic views.

[0043] Figure 4 The adjustable stator blade and the second clamping assembly of a preferred embodiment of the application are structure schematic views.

[0044] Figure 5 The adjustable stator blade of a preferred embodiment of the application is a local structure schematic view of another view angle of the outer shaft neck.

[0045] Figure 6 The adjustable stator blade of a preferred embodiment of the application is a structure schematic view. Figure 5 The cross-sectional view along line A-A.

[0046] BRIEF DESCRIPTION OF DRAWINGS

[0047] Adjustable stator blade 10

[0048] Outer shaft neck 101

[0049] Positioning shaft shoulder 1011

[0050] Inner shaft neck 102

[0051] First clamping assembly 1

[0052] First fastener 11

[0053] First upper clamping piece 12

[0054] First lower clamping piece 13

[0055] Clamping seat 14

[0056] Accommodation cavity 141

[0057] Inclined surface 142

[0058] Fixing member 15

[0059] Second clamping assembly 2

[0060] Clamping hole 201

[0061] Second fastener 21

[0062] Second upper clamping piece 22

[0063] Second lower clamping piece 23

[0064] Base 3 DETAILED DESCRIPTION

[0065] The present application will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, given by way of illustration only, and thus, are not intended to limit the present application.

[0066] As Figures 1-6 shown, the present embodiment discloses a vibration fatigue test device for fatigue test of an adjustable stator blade 10, the adjustable stator blade 10 having an outer journal 101 and an inner journal 102. The vibration fatigue test device comprises a first clamping assembly 1 for clamping the outer journal 101 and a second clamping assembly 2 having a clamping hole 201 for clamping the inner journal 102, the clamping hole 201 having a variable radial dimension in the height direction.

[0067] The vibration fatigue test device clamps and fixes the outer journal 101 and the inner journal 102 of the adjustable stator blade 10 respectively, which is closer to the real installation boundary of the engine, and the stress distribution on the blade body of the adjustable stator blade 10 during the vibration test is more consistent with the state of the whole machine test run, so that the fatigue test result is more accurate and reliable. The clamping hole 201 for clamping the inner journal 102 is provided with a variable radial dimension in the height direction, which avoids the situation that the inner journal 102 cannot be fixed or the fixing effect is poor due to the installation error of the outer journal 101, so as to improve the clamping and fixing effect of the vibration fatigue test device.

[0068] The first clamping assembly 1 comprises a first fastener 11, a first upper clamping piece 12 and a first lower clamping piece 13, the first upper clamping piece 12 and the first lower clamping piece 13 are formed with a containing cavity for containing the outer journal 101, and the first fastener 11 is used for tightly fixing the first upper clamping piece 12 and the first lower clamping piece 13, which facilitates quick disassembly and assembly and improves the test efficiency.

[0069] Further, the first clamping assembly 1 further comprises a clamping seat 14, one side of the clamping seat 14 is provided with an open accommodating cavity 141, the first upper clamping piece 12 and the first lower clamping piece 13 are located in the accommodating cavity 141, and the first fastener 11 is connected to the clamping seat 14 and tightly presses the first upper clamping piece 12 and the first lower clamping piece 13 to the inner wall of the clamping seat 14. The first fastener 11 tightly presses the first upper clamping piece 12 and the first lower clamping piece 13 to the inner wall of the clamping seat 14, so that the outer shaft neck 101 arranged between the first upper clamping piece 12 and the first lower clamping piece 13 is clamped. Since the accommodating cavity 141 radially constrains the first upper clamping piece 12 and the first lower clamping piece 13 in the cavity, the clamping effect is good without the first upper clamping piece 12 and the first lower clamping piece 13 being separated due to excessive clamping force.

[0070] Specifically, the clamping seat 14 has a threaded hole extending from the surface of the clamping seat 14 to the accommodating cavity 141, and the first fastener 11 is screwed in the threaded hole, and one end of the first fastener 11 abuts against the surface of the first upper clamping piece 12 close to the first fastener 11. The first fastener 11 is screwed in the threaded hole, which facilitates screwing in or out of the first fastener 11, and realizes quick clamping or disassembly. In the embodiment, the first fastener 11 is a bolt, and the number of the bolts is two.

[0071] Further, the outer contour of the first upper clamping piece 12 and the first lower clamping piece 13 in the clamped state matches the accommodating cavity 141, and the cross-sectional shape of the first upper clamping piece 12 and the first lower clamping piece 13 in the clamped state is polygonal, which prevents the first upper clamping piece 12 and the first lower clamping piece 13 from rotating after being subjected to a reaction force, and improves the clamping and fixing effect.

[0072] In the embodiment, the cross-sectional shape of the first upper clamping piece 12 and the first lower clamping piece 13 in the clamped state is rectangular. Since the outer contour of the first upper clamping piece 12 and the first lower clamping piece 13 in the clamped state matches the accommodating cavity 141, the cross-sectional shape of the accommodating cavity 141 is also rectangular, the rectangular is obliquely arranged, the oblique angle of the rectangular matches the torsion angle of the adjustable stator blade 10, so that the blade body of the adjustable stator blade 10 is approximately parallel to the horizontal plane, reduces the excitation force of the vibration table, and saves the power consumption of the test equipment. The torsion angle is the included angle between the outer shaft diameter and the blade body. At the same time, the obliquely arranged accommodating cavity 141 facilitates disassembly of the first upper clamping piece 12 and the first lower clamping piece 13, and improves the test efficiency.

[0073] The upper surface of the clamping seat 14 is provided with an inclined surface 142, and the side of the rectangular cross-sectional shape of the first upper clamping piece 12 and the first lower clamping piece 13 in the clamping state is arranged in parallel with the inclined surface 142, that is, the side of the first upper clamping piece 12 is parallel to the inclined surface 142, and the extension direction of the threaded hole is perpendicular to the inclined surface 142, so that the first fastener 11 is conveniently pressed in the first upper clamping piece 12, and the pressing effect is improved. At the same time, it is also convenient to arrange a plurality of first fasteners 11 of the same specification in the inclined surface 142. The side of the rectangle here is the side of the first upper clamping piece 12.

[0074] Preferably, the first upper clamping piece 12 and the first lower clamping piece 13 each have a fitting surface, and the fitting surfaces surround a receiving cavity, and the fitting surfaces are used to fit the outer circumferential surface of the outer shaft neck 101. The fitting surface can increase the contact area between the first upper clamping piece 12 and the first lower clamping piece 13 and the outer shaft neck 101, and correspondingly increase the friction, and improve the clamping and fixing effect.

[0075] In order to improve the fixing effect, the outer circumferential surface of the outer shaft neck 101 has an outwardly protruding positioning shaft shoulder 1011, and the end surface of the first upper clamping piece 12 and the first lower clamping piece 13 is used to abut against the positioning shaft shoulder 1011. The first clamping assembly 1 further comprises a fixing piece 15, which is detachably connected to the end of the outer shaft neck 101, and the fixing piece 15 is used to press the first upper clamping piece 12 and the first lower clamping piece 13 against the positioning shaft shoulder 1011. The fixing piece 15 presses the outer shaft neck 101 against the end surface of the first upper clamping piece 12 and the first lower clamping piece 13 in the axial direction, avoids the possibility of movement of the adjustable stator blade 10 due to insufficient friction of the contact surface during vibration test, and makes the clamping state of the adjustable stator blade 10 more stable during the test, and the test effect is better.

[0076] In the embodiment, the outer shaft neck 101 is provided with a thread, and the fixing piece 15 is a fixing nut.

[0077] In order to facilitate detachable fixing of the fixing piece 15, the first upper clamping piece 12 and the first lower clamping piece 13 from both ends of the receiving cavity 141 without being restricted by the space of the receiving cavity 141, the receiving cavity 141 penetrates the clamping seat 14 in the axial direction of the adjustable stator blade 10.

[0078] As shown in Figure 4 The second clamping assembly 2 comprises a second fastener 21, a second upper clamping piece 22 and a second lower clamping piece 23, the second fastener 21 passes through the second upper clamping piece 22 and is connected to the second lower clamping piece 23, and the second upper clamping piece 22 and the second lower clamping piece 23 form a clamping hole 201.

[0079] In the embodiment, the second upper clamping piece 22 is pressed on the second lower clamping piece 23 by the second fastener 21, so as to clamp the inner journal 102 arranged between the second upper clamping piece 22 and the second lower clamping piece 23, which is simple in structure, convenient to disassemble and assemble, and improves the test efficiency.

[0080] The lower surface of the second upper clamping piece 22 is provided with a clamping groove, and the inner diameter of the clamping groove gradually decreases from bottom to top; and / or, the upper surface of the second lower clamping piece 23 is provided with a clamping groove, and the inner diameter of the clamping groove gradually increases from bottom to top. In the embodiment, the clamping groove can be arranged on the second upper clamping piece 22 or the second lower clamping piece 23, or, as in the embodiment, the second upper clamping piece 22 and the second lower clamping piece 23 are both provided with the clamping groove, and the clamping groove has a variable radial dimension in the height direction, so as to avoid the situation that the inner journal 102 cannot be fixed or the fixing effect is poor due to the installation error of the outer journal 101, and improve the clamping and fixing effect of the vibration fatigue test device.

[0081] In the embodiment, the lower surface of the second upper clamping piece 22 is provided with an upper V-shaped groove, and the upper surface of the second lower clamping piece 23 is also provided with a lower V-shaped groove, and the upper V-shaped groove and the lower V-shaped groove are oppositely arranged at the openings to form a clamping hole 201, so as to facilitate the adaptation to the inner journals 102 of different diameters, improve the application range, and facilitate the processing.

[0082] The vibration fatigue test device further comprises a base 3, and the lower ends of the first clamping assembly 1 and the second clamping assembly 2 are connected to the base 3 and are arranged on the upper surface of the base 3 in a spaced manner. The base 3 fixes the first clamping assembly 1 and the second clamping assembly 2 to form a whole, and improves the fixing effect of the vibration test. The base 3 is provided with a plurality of threaded holes arranged in a spaced manner, which are used to be connected and fixed with the vibration table surface.

[0083] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to the embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the protection scope of the present application.

Claims

1. A vibration fatigue testing apparatus for fatigue testing of adjustable stator blades, wherein the adjustable stator blades have an outer journal and an inner journal, characterized in that, The vibration fatigue testing apparatus includes: A first clamping assembly is used to clamp the outer journal; A second clamping assembly having a clamping hole for clamping the inner journal, the clamping hole having a radial dimension that varies along the height direction; in, The second clamping assembly includes a second fastener, a second upper clamping member, and a second lower clamping member. The second fastener passes through the second upper clamping member and is connected to the second lower clamping member. The second upper clamping member and the second lower clamping member form the clamping hole. The lower surface of the second upper clamping member is provided with a clamping groove, the inner diameter of which gradually decreases from bottom to top; and / or, the upper surface of the second lower clamping member is provided with a clamping groove, the inner diameter of which gradually increases from bottom to top.

2. The vibration fatigue testing apparatus as described in claim 1, characterized in that, The first clamping assembly includes a first fastener, a first upper clamping member, and a first lower clamping member. The first upper clamping member and the first lower clamping member form a receiving cavity for accommodating the outer journal. The first fastener is used to press and fix the first upper clamping member and the first lower clamping member together.

3. The vibration fatigue testing apparatus as described in claim 2, characterized in that, The first clamping assembly further includes a clamping seat, one side of which is provided with an open receiving cavity. The first upper clamping member and the first lower clamping member are located in the receiving cavity. The first fastener is connected to the clamping seat and presses the first upper clamping member and the first lower clamping member against the inner wall of the clamping seat.

4. The vibration fatigue testing apparatus as described in claim 3, characterized in that, The clamping seat has a threaded hole that extends from the surface of the clamping seat to the receiving cavity. The first fastener is screwed into the threaded hole, and one end of the first fastener abuts against the surface of the first upper clamping member near the first fastener.

5. The vibration fatigue testing apparatus as described in claim 4, characterized in that, The outer contours of the first upper clamping member and the first lower clamping member in the clamping state match the receiving cavity, and the cross-sectional shape of the first upper clamping member and the first lower clamping member in the clamping state is polygonal.

6. The vibration fatigue testing apparatus as described in claim 5, characterized in that, The polygon is a rectangle, the rectangle is tilted, and the tilt angle of the rectangle matches the torsion angle of the adjustable stator blade.

7. The vibration fatigue testing apparatus as described in claim 6, characterized in that, The surface of the clamping seat is provided with an inclined surface, one side of the rectangle is arranged parallel to the inclined surface, the threaded hole is provided in the inclined surface, and the extension direction of the threaded hole is perpendicular to the inclined surface.

8. The vibration fatigue testing apparatus as described in claim 2, characterized in that, Both the first upper clamping member and the first lower clamping member have a contact surface, which forms the receiving cavity and is used to contact the outer peripheral surface of the outer journal.

9. The vibration fatigue testing apparatus as described in claim 2, characterized in that, The outer journal has an outwardly protruding positioning shoulder on its outer peripheral surface. The first clamping assembly also includes a fixing member, which is detachably connected to the end of the outer journal. The fixing member presses one end face of the first upper clamping member and one end face of the first lower clamping member against the positioning shoulder.

10. The vibration fatigue testing apparatus as described in claim 3, characterized in that, The receiving cavity extends through the clamping seat along the axial direction of the adjustable stator blade.

11. The vibration fatigue testing apparatus as described in claim 1, characterized in that, The lower surface of the second upper clamping member is provided with an upper V-shaped groove, and the upper surface of the second lower clamping member is provided with a lower V-shaped groove. The openings of the upper V-shaped groove and the lower V-shaped groove are arranged opposite to each other to form the clamping hole.

12. The vibration fatigue testing apparatus according to any one of claims 1-11, characterized in that, The vibration fatigue testing device also includes a base, and the lower ends of the first clamping assembly and the second clamping assembly are both connected to the base and are spaced apart on the upper surface of the base.

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