An experimental device for measuring the static stiffness of a turbine support shock absorber

Abstract

An experimental device for measuring the static stiffness of a turbine support shock absorber, comprising: a rigid platform; a support seat arranged on the rigid platform, and a turbine support shock absorber connection structure is arranged at one end of the support seat; a bearing bush arranged inside the turbine support shock absorber, and a bearing is arranged in the bearing bush; a journal passing through the inner ring of the bearing; a loading device connected to the journal; a dial indicator arranged at the position directly above and / or directly below the turbine support shock absorber. The bearing bush and the bearing are used to replace the cylindrical roller bearing on the engine, and the bearing bush and the bearing are in interference fit so that they can bear a certain axial force, and the journal can rotate freely, always ensuring that the loading direction of the load applied by the loading device is in the vertical direction. The stress mode of the turbine support shock absorber on the engine is simulated on this experimental device, ensuring the consistency of the test stress and the stress position on the engine, so as to obtain the static stiffness of the turbine support shock absorber.

Description

Technical Field

[0001] The present invention relates to the test technology of turbine support dampers, and particularly to a test device for measuring the static stiffness of turbine support dampers. Background Art

[0002] Many aero - engines adopt the elastic - damping support structure design, which includes turbine support dampers. The rotor system adopts elastic supports. The deformation of the supports and the internal resistance of their materials can play a certain role in damping the rotor system and can also adjust the critical speed of the rotor system. For a certain series of aero - engines, the overall vibration of the engine has been relatively large. It may be due to the relatively small stiffness of the turbine support damper. During the operation of the engine, its deformation is relatively large, and it collides with the wear - resistant bushing, thus causing the relatively large vibration of the engine. Therefore, it is very necessary to measure the static stiffness of the turbine support damper, master its stiffness value, and provide reference data for the overall vibration of the engine. Summary of the Invention

[0003] The main object of the present invention is to propose a test device for measuring the static stiffness of turbine support dampers, aiming to solve the above - mentioned technical problems.

[0004] To achieve the above object, the present invention proposes a test device for measuring the static stiffness of turbine support dampers, including: a rigid platform; a support seat arranged on the rigid platform, and a turbine support damper connection structure is arranged at one end of the support seat; a bearing bushing for being installed inside the turbine support damper, and a bearing is arranged in the inner hole of the bearing bushing; a journal passing through and fixedly connected to the inner ring of the bearing; a loading device connected to the journal for applying a load to the journal; and a dial indicator arranged at the position directly above and / or directly below the turbine support damper.

[0005] Preferably, the turbine support damper connection structure on the support seat includes an insertion part and an annular ear plate arranged on the insertion part; stud through - holes are evenly arranged on the annular ear plate; the insertion part is inserted into the inner hole of the turbine support damper, and the end of the turbine support damper is fixed to the annular ear plate through a stud assembly.

[0006] Preferably, the support seat is installed on the rigid platform through a support frame; the support frame includes a bottom plate and a vertical plate vertically welded to the bottom plate; through - holes are arranged on the bottom plate for screw - connection with the rigid platform; the support seat passes through the vertical plate and is welded.

[0007] Preferably, a reinforcing rib plate is arranged between the vertical plate and the bottom plate.

[0008] Preferably, the number of the vertical plates is two, one of which supports at the end position of the support seat, and the other supports at the middle position of the support seat.

[0009] Preferably, the journal includes a first shaft section, a second shaft section, and an annular baffle located between the first shaft end and the second shaft section; the first shaft section, the second shaft section, and the annular baffle are of an integrally formed structure; a first external thread section and a loading device mounting portion are provided on the first shaft section, the loading device is mounted on the loading device mounting portion, abuts against the end face of the annular baffle, and is locked by a nut provided on the first external thread section; a bearing mounting portion and a second external thread section are provided on the second shaft section; the inner ring of the bearing is mounted on the bearing mounting portion and is locked by a nut provided on the second external thread section.

[0010] Preferably, a retaining ring is provided at the root position of the second shaft section and the annular baffle; the inner ring of the bearing abuts against the retaining ring, and the diameter of the retaining ring is less than or equal to the outer diameter of the inner ring of the bearing.

[0011] Preferably, the bearing is installed in the inner hole of the bearing bushing by interference fit, and a limiting ring is provided at the hole position of the inner hole of the bearing bushing close to the loading device; the outer ring of the bearing abuts against the limiting ring.

[0012] Preferably, the loading device includes a heavy object hook, a weight support plate, and weights; the heavy object hook is an "L"-shaped structure composed of a vertical plate and a horizontal plate, the vertical plate of which is connected to the journal, and the horizontal plate is connected to the weight support plate by a double-headed screw; the weights are placed on the weight support plate.

[0013] Preferably, the dial indicator is arranged at a position corresponding to the bearing bushing, and is located directly above and / or directly below the turbine support shock absorber.

[0014] Due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows: the turbine support shock absorber is fixed by using the support seat installed on the rigid platform; the bearing bushing and the bearing are used to replace the cylindrical roller bearing on the engine, and the interference fit between the bearing bushing and the bearing enables them to bear a certain axial force, and the journal provided on the bearing can rotate freely, always ensuring that the loading direction of the load applied by the loading device is in the vertical direction, simulating the force-bearing mode of the turbine support shock absorber on the engine on this test device, ensuring the consistency of the test force and the force-bearing position on the engine, so as to obtain the static stiffness of the turbine support shock absorber. This test device has the advantages of simple structure, easy operation, and remarkable effectiveness. Description of the Drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0016] Figure 1 Schematic structural diagram of a test device for measuring the static stiffness of a turbine support shock absorber provided by the present invention;

[0017] Figure 2 For Figure 1 Enlarged view of part A in

[0018] Figure 3 Schematic structural diagram of the support seat in the present invention;

[0019] Figure 4 Schematic structural diagram of the journal in the present invention;

[0020] Figure 5 Schematic structural diagram of the bearing bushing in the present invention;

[0021] Explanation of the reference numerals in the drawings: 1 - Rigid platform; 2 - Support seat; 201 - Insertion part; 202 - Ring-shaped ear plate; 203 - Stud through-hole; 3 - Bearing bushing; 301 - Limit ring; 4 - Bearing; 5 - Journal; 510 - First shaft section; 511 - First external thread section; 512 - Loading device installation part; 520 - Second shaft section; 521 - Bearing installation part; 522 - Second external thread section; 523 - Retaining ring; 530 - Ring-shaped baffle; 6 - Loading device; 601 - Weight hook; 602 - Weight support plate; 603 - Weights; 604 - Double-headed screw; 7 - Dial indicator; 8 - Support frame; 801 - Bottom plate; 802 - Vertical plate; 803 - Reinforcing rib plate; 804 - Through-hole; 9 - Stud; 10 - Locking washer; 11 - Nut; 12 - Compression nut; 100 - Turbine support shock absorber. Detailed implementation manners

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the attached drawings). If this specific posture changes, the directional indications will also change accordingly.

[0024] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0025] Combined with Figure 1 、 Figure 2 As shown, a test device for measuring the static stiffness of a turbine support shock absorber includes:

[0026] A rigid platform 1; a support seat 2 disposed on the rigid platform 1, and a turbine support shock absorber connection structure is provided at one end of the support seat 2;

[0027] A bearing bushing 3 for being installed inside the turbine support shock absorber 100. The bearing bushing 3 is fixed to the turbine support shock absorber 100 through a compression nut 12, and a bearing 4 is provided in the inner hole of the bearing bushing 3; the outer diameter of the bearing bushing 3 is the same as the outer diameter of the cylindrical roller bearing on the engine;

[0028] A journal 5 is inserted through and fixedly connected to the inner ring of the bearing 4;

[0029] A loading device 6 is connected to the journal 5 and is used to apply a load to the journal 5;

[0030] A dial indicator 7 is disposed at a position directly above and / or directly below the turbine support shock absorber 100.

[0031] The test device fixes the turbine support shock absorber 100 by using the support seat 2 installed on the rigid platform 1; uses the bearing bush 3 and the bearing 4 to replace the cylindrical roller bearing on the engine. The bearing bush 3 and the bearing 4 are in interference fit so that they can bear a certain axial force, and the journal 5 provided on the bearing 4 can rotate freely, always ensuring that the acting direction of the load applied by the loading device 6 is in the vertical direction. The stress mode of the turbine support shock absorber in the engine is simulated on this test device. The displacement amount directly above and / or directly below the turbine support shock absorber 100 can be measured by the dial indicator 7 to represent its deformation, and then the stiffness change curve of the turbine support shock absorber 100 can be obtained according to the stiffness formula K = P / δp (where P is the magnitude of the acting force and δp is the deformation caused by the force P). This test device ensures the consistency of the test stress and the stress position on the engine, so as to obtain the static stiffness of the turbine support shock absorber 100.

[0032] Combined with Figure 3 As shown, the connection structure of the turbine support shock absorber on the support seat 2 includes an insertion part 201 and an annular ear plate 202 provided on the insertion part 201; stud holes 203 are evenly arranged on the annular ear plate 202; the insertion part 201 is inserted into the inner hole of the turbine support shock absorber 100, and the end of the turbine support shock absorber 100 is fixed to the annular ear plate 202 through a stud assembly. The stud assembly includes a stud 9, a lock washer 10 and a nut 11. When the turbine support shock absorber 100 is installed, the insertion part 201 is directly inserted into the inner hole at the right end of the turbine support shock absorber 100, so that the right end face of the turbine support shock absorber 100 abuts against the annular ear plate 202 and then is fixed by the stud 9, the lock washer 10 and the nut 11, and the installation is simple and convenient.

[0033] Combined with Figure 1As shown, the support base 2 is mounted on the rigid platform 1 through the support frame 8; the support frame 8 includes a bottom plate 801 and a vertical plate 802 vertically welded to the bottom plate 801; through holes 804 are provided on the bottom plate 801 for screw connection with the rigid platform 1; the support base 2 passes through the vertical plate 802 and is welded. The bottom plate 801 is screwed to the rigid platform 1, which facilitates the replacement of different support frames 8 and support bases 2. Further, a reinforcing rib plate 803 is provided between the vertical plate 802 and the bottom plate 801 to strengthen the vertical plate 802, ensure the stiffness of the vertical plate 802, and prevent the loading device 6 from bending and deforming during the loading process. Further, the number of the vertical plates 802 is two, one of which supports at the end position of the support base 2, and the other supports at the middle position of the support base 2. By providing two vertical plates 802, when the loading device 6 is loading, from the analysis of the force condition, it can be seen that the vertical plate 802 arranged at the middle position of the support base 2 can play a fulcrum role, and the vertical plate 802 arranged at the end position exerts a downward force on the support base 2. Therefore, setting two vertical plates 802 can better make the support base 2 bear force evenly.

[0034] Combined with Figure 4 As shown, the journal 5 includes a first shaft section 510, a second shaft section 520, and an annular baffle 530 located between the first shaft end 510 and the second shaft section 520; the first shaft section 510, the second shaft section 520 and the annular baffle 530 are integrally formed; a first external thread section 511 and a loading device mounting portion 512 are provided on the first shaft section 510, the loading device 6 is mounted on the loading device mounting portion 512, and abuts against the end face of the annular baffle 530 and is locked by a nut provided on the first external thread section 511; a bearing mounting portion 521 and a second external thread section 522 are provided on the second shaft section 520; the inner ring of the bearing 4 is mounted on the bearing mounting portion 521 and is locked by a nut provided on the second external thread section 522. Further, a retaining ring 523 is provided at the root position between the second shaft section 520 and the annular baffle 530; the inner ring of the bearing 4 abuts against the retaining ring 523, and the diameter of the retaining ring 523 is less than or equal to the outer diameter of the inner ring of the bearing 4.

[0035] Combined with Figure 2 、 Figure 5 As shown, in this embodiment, the bearing 4 is installed in the inner hole of the bearing bushing 3 by interference fit, and a limiting ring 301 is provided at the orifice position of the inner hole of the bearing bushing 3 close to the loading device 6; the outer ring of the bearing 4 abuts against the limiting ring 301.

[0036] Combined with Figure 1As shown, the loading device 6 includes a heavy object hook 601, a weight support plate 602, and weights 603. The heavy object hook 601 has an "L" shape structure composed of a vertical plate and a horizontal plate. The vertical plate is connected to the journal 5 and abuts against the annular baffle 530 of the journal 5, which can prevent the vertical plate from flipping. The horizontal plate is connected to the weight support plate 602 through a double-headed screw 604. The weights 603 are placed on the weight support plate 602. The journal 5, the compression nut 12, the heavy object hook 601, the double-headed screw 604, the weight support plate 602, and the weights 603 are mainly used for the application and transmission of loads.

[0037] Combined with Figure 1 As shown, the dial indicator 7 is arranged at a position corresponding to the bearing bush 3 and is located directly above and / or directly below the turbine support shock absorber 100. Since the force application point of the turbine support shock absorber 100 is at the position of the bearing bush 3, the dial indicator 7 is arranged at a position corresponding to the bearing bush 3 to facilitate measuring the deformation of the turbine support shock absorber 100 and thus obtaining the stiffness change curve.

[0038] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made using the description and drawings of the present invention under the inventive concept of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An experimental device for measuring the static stiffness of a turbine support shock absorber, characterized in that, Comprising: A rigid platform (1); A support seat (2) provided on the rigid platform (1), and a turbine support shock absorber connection structure is provided at one end of the support seat (2); A bearing bushing (3) for installation inside a turbine support shock absorber (100), the bearing bushing (3) is fixed to the turbine support shock absorber (100) by a compression nut (12), and a bearing (4) is provided in the inner hole of the bearing bushing (3); the outer diameter of the bearing bushing (3) is the same as the outer diameter of the cylindrical roller bearing on the engine; A journal (5) passing through and fixedly connected to the inner ring of the bearing (4); A loading device (6) connected to the journal (5) for applying a load to the journal (5); A dial indicator (7) provided directly above and / or directly below the turbine support shock absorber (100); The turbine support shock absorber connection structure on the support seat (2) includes an insertion portion (201) and an annular ear plate (202) provided on the insertion portion (201); stud through holes (203) are evenly distributed on the annular ear plate (202); the insertion portion (201) is inserted into the inner hole of the turbine support shock absorber (100), and the end of the turbine support shock absorber (100) is fixed to the annular ear plate (202) by a stud assembly; The journal (5) includes a first shaft section (510), a second shaft section (520), and an annular baffle (530) located between the first shaft end (510) and the second shaft section (520); the first shaft section (510), the second shaft section (520) and the annular baffle (530) are of an integrally formed structure; A first external thread section (511) and a loading device mounting portion (512) are provided on the first shaft section (510), the loading device (6) is mounted on the loading device mounting portion (512), abuts against the end face of the annular baffle (530), and is locked by a nut provided on the first external thread section (511); A bearing mounting portion (521) and a second external thread section (522) are provided on the second shaft section (520); the inner ring of the bearing (4) is mounted on the bearing mounting portion (521) and is locked by a nut provided on the second external thread section (522); The bearing (4) is installed in the inner hole of the bearing bushing (3) by interference fit, and a limiting ring (301) is provided at the hole opening position of the inner hole of the bearing bushing (3) close to the loading device (6); the outer ring of the bearing (4) abuts against the limiting ring (301).

2. The test device for measuring the static stiffness of a turbine support shock absorber according to claim 1, characterized in that, The support seat (2) is mounted on the rigid platform (1) through a support frame (8); the support frame (8) includes a bottom plate (801) and a vertical plate (802) welded to the bottom plate (801); through holes (804) are provided on the bottom plate (801) for screw connection with the rigid platform (1); the support seat (2) passes through the vertical plate (802) and is welded.

3. The test device for measuring the static stiffness of a turbine support shock absorber according to claim 2, characterized in that, A reinforcing rib plate (803) is provided between the vertical plate (802) and the bottom plate (801).

4. The test device for measuring the static stiffness of a turbine support shock absorber according to claim 2, wherein, There are two vertical plates (802), one of which is supported at the end position of the support seat (2), and the other is supported at the middle position of the support seat (2).

5. The test device for measuring the static stiffness of a turbine support shock absorber according to claim 1, characterized in that, A retaining ring (523) is provided at the root position of the second shaft section (520) and the annular baffle (530); the inner ring of the bearing (4) abuts against the retaining ring (523), and the diameter of the retaining ring (523) is less than or equal to the outer diameter of the inner ring of the bearing (4).

6. The test device for measuring the static stiffness of a turbine support shock absorber according to claim 1, characterized in that, The loading device (6) includes a heavy object hook (601), a weight support plate (602) and weights (603); the heavy object hook (601) has an "L" shape structure composed of a vertical plate and a horizontal plate, the vertical plate of which is connected to the journal (5), and the horizontal plate is connected to the weight support plate (602) through a double-headed screw (604); the weights (603) are placed on the weight support plate (602).

7. The test device for measuring the static stiffness of a turbine support shock absorber according to claim 1, characterized in that, The dial indicator (7) is arranged at a position corresponding to the bearing bush (3), and is located directly above and / or directly below the turbine support shock absorber (100).

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