A high-speed rotor discontinuous profile test lead anti-erosion device

Abstract

This application belongs to the technical field of engine test, and particularly relates to an anti-erosion device for test leads of a high-speed rotor with a discontinuous profile. The device includes a first metal foil (3) welded at the transition of two specimens; a second metal foil (4) which is crimped onto the first metal foil (3) by welding after the test lead is attached to the first metal foil (3); a third metal foil (7) welded at the bottom of the oil sump (13) and forming a through-hole for accommodating the test lead (5) with the bottom of the oil sump (13); a diversion dam (9) on the side of the third metal foil (7) facing the oil flow, with both ends of the diversion dam (9) fixed on the surface of the oil sump (13), and the middle part of the diversion dam bent upward to form an inclined plate which is inclined towards the third metal foil (7). This application solves the problem of reliable installation of test leads under the conditions of the discontinuous profile on the surface of a high-speed rotor and the erosion of the oil sump.

Description

Technical Field

[0001] This application belongs to the technical field of engine test, and particularly relates to an anti-erosion device for test leads on the non-continuous surface of a high-speed rotor. Background Art

[0002] To study the vibration characteristics and resonance response of rotor blades, and verify the damping characteristics and high-cycle fatigue performance of blades, the currently more advanced method at home and abroad is the excitation test on a rotating test bench. The test piece uses real engine components, and the high-pressure turbine rotor blades in the rotating state are excited by the method of atomized droplet injection at room temperature. The measurement method for blade vibration in the rotating state is usually the strain gauge measurement method, that is, strain gauges are pasted on the blade surface, and then the test leads on the surface of the disk web are connected to the high-speed slip ring at the axis, and finally the vibration signal is introduced into the test instrument through the slip ring.

[0003] Currently, on the non-continuous surface of the rotor, when installing test leads at discontinuous positions, they can only be placed suspended, as Figure 1 shown. The test lead 5 extends from the rotor measurement point 11 through the disk web 8 to connect to the high-speed slip ring at the axis. The disk web 8 includes a first test piece 1 and a second test piece 2, and a transition groove 12 is formed between the two test pieces. When the rotor is in the rotating working state, due to the centrifugal force, the test lead will swing freely with the rise and fall of the rotational speed, which is extremely easy to cause damage. On the other hand, when conducting an oil excitation test on some vertical rotating testers, the oil will form an oil pool 13 on the disk web in a vacuum state, and the oil pool will damage the test lead 5 installed on the web under the high-speed rotation state. The commonly used glass cloth and metal foil wrapping protection methods in the industry have a certain protective effect on air flow erosion, but cannot effectively protect against the impact of the oil pool. Summary of the Invention

[0004] To solve one of the above problems, this application provides an anti-erosion device for test leads on the non-continuous surface of a high-speed rotor, mainly including:

[0005] A first metal foil, welded on the first test piece and the second test piece, and spanning across the transition groove;

[0006] A second metal foil, after pasting the test lead on the first metal foil, is crimped on the first metal foil by welding;

[0007] A third metal foil, welded at the bottom of the oil pool, and forming a through hole for accommodating the test lead with the bottom of the oil pool;

[0008] A diversion dam, arranged on the side of the third metal foil facing the oncoming oil flow, both ends of the diversion dam are fixed on the surface of the oil pool, the middle part of the diversion dam bends upward to form an inclined plate, and the inclined plate inclines towards the direction of the third metal foil.

[0009] Preferably, a copper bar is arranged in the transition groove, and the first metal foil is in contact with the first test piece, the second test piece and the copper bar.

[0010] Preferably, the two sides of the first metal foil along the extending direction of the test lead are respectively spot-welded to the first test piece, and each single side connected to the first test piece is provided with double rows of weld spots. The two sides of the first metal foil along the extending direction of the two-side test lead are respectively spot-welded to the second test piece, and each single side connected to the second test piece is provided with double rows of weld spots.

[0011] Preferably, the second metal foil is larger than the first metal foil in the dimension along the extending direction of the test lead. The second metal foil covers the first metal foil, and the part exceeding the first metal foil is spot-welded to the first test piece and the second test piece.

[0012] Preferably, the diversion dam is spaced 10-15 mm from the third metal foil.

[0013] Preferably, the inclination angle of the inclined plate of the diversion dam is 60-80°.

[0014] This application can solve the problem of reliable installation of test leads under the conditions of the discontinuous surface on the surface of a high-speed rotor and the scouring of the oil sump, save the time and economic costs brought by the test modification of the engine and the test rig and the hardware production, and improve the data acquisition rate. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the layout of the dynamic stress leads of the rotor blades of the existing oil excitation test rig.

[0016] Figure 2 It is a schematic diagram of the installation of the test lead at the transition groove of a preferred embodiment of the anti-scouring device for the test lead of the discontinuous surface of the high-speed rotor of this application.

[0017] Figure 3 For this application Figure 2 The top view of the shown embodiment.

[0018] Figure 4 It is a schematic diagram of the installation of the test lead at the oil sump of a preferred embodiment of the anti-scouring device for the test lead of the discontinuous surface of the high-speed rotor of this application.

[0019] Wherein, 1 - first test piece, 2 - second test piece, 3 - first metal foil, 4 - second metal foil, 5 - test lead, 6 - copper bar, 7 - third metal foil, 8 - wheel disc web, 9 - diversion dam;

[0020] 11 - rotor measurement point, 12 - transition groove, 13 - oil sump, 14 - fuel injector. Detailed Embodiment

[0021] To make the purpose, technical solution and advantages of the present application more clear, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application. The embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

[0022] The present application provides an anti-erosion device for the test lead of a high-speed rotor non-continuous profile, as Figure 1 shown, the test lead 5 is introduced from the rotor measuring point 11 through the surface of the wheel disc web 8 into the axial high-speed slip ring. The wheel disc web 8 includes a first specimen 1 and a second specimen 2. There is a transition groove 12 between the first specimen 1 and the second specimen 2, and there is an oil sump 13 on the second specimen 2, as Figures 2 - 4 shown, the anti-erosion device includes:

[0023] A first metal foil 3, welded on the first specimen 1 and the second specimen 2 and spanning the transition groove 12;

[0024] A second metal foil 4, after the test lead is attached to the first metal foil 3, is press-connected to the first metal foil 3 by welding;

[0025] A third metal foil 7, welded to the bottom of the oil sump 13 and forming a through hole for accommodating the test lead 5 with the bottom of the oil sump 13;

[0026] A diversion dam 9, arranged on the side of the third metal foil 7 facing the oncoming oil flow. Both ends of the diversion dam 9 are fixed on the surface of the oil sump 13. The middle part of the diversion dam is bent upward to form an inclined plate, and the inclined plate is inclined towards the third metal foil 7.

[0027] In some alternative embodiments, a copper bar 6 is arranged in the transition groove 12, and the first metal foil 3 is in contact with the first specimen 1, the second specimen 2 and the copper bar 6.

[0028] Reference Figure 2, first, clean the surfaces of the discontinuous surfaces 1 and 2 with acetone solution, and then use a spot welder to weld the first metal foil 3 on the surfaces of the first specimen 1 and the second specimen 2 to complete the "bridge circuit" connection; insert the copper rod 6 into the transition groove 12 formed by the first metal foil 3 of the first specimen 1 and the second specimen 2 to ensure stable contact with the first specimen 1 and the second specimen 2; use the second metal foil 4 to complete the installation operation of the test wire 5 from the first specimen 1 to the second specimen 2 via the "bridge circuit" to achieve its reliable installation on the discontinuous surface.

[0029] In some alternative embodiments, the two sides of the first metal foil 3 along the extending direction of the test lead are respectively spot-welded to the first specimen 1, and each single side connected to the first specimen 1 is provided with two rows of solder joints. The two sides of the first metal foil 3 along the extending direction of the two-side test lead are respectively spot-welded to the second specimen 2, and each single side connected to the second specimen 2 is provided with two rows of solder joints.

[0030] In some alternative embodiments, the size of the second metal foil 4 along the extending direction of the test lead is larger than that of the first metal foil 3. The second metal foil 4 covers the first metal foil 3, and the part exceeding the first metal foil 3 is spot-welded to the first specimen 1 and the second specimen 2.

[0031] Reference Figure 3 , first, the metal foil should be selected to be of the same material as the first specimen 1 and the second specimen 2. Then, adjust the energy of the spot welder to 18 - 20 J, with the welding needle forming an angle of 85° - 90° with the specimen. Finally, apply a pressure of 1 - 3 kg for welding. To ensure the sealing effect, two rows of solder joints are used on each single side.

[0032] In some alternative embodiments, the diversion dam 9 is spaced 10 - 15 mm from the third metal foil 7.

[0033] In some alternative embodiments, the inclination angle of the inclined plate of the diversion dam 9 is 60 - 80°.

[0034] This embodiment refers to Figure 4 , use the third metal foil 7 to fix the test wire on the wheel disc web 8. Cut the metal foil into a rectangular block of 18 mm x 25 mm, and then Figure 4 shape it according to the structure of the third metal foil 7 shown in

[0035] Reference Figure 4, the working principle of the diversion dam is as follows: the oil in the oil sump of the wheel disc web will first impact the diversion dam 9 near the test lead 5 under the condition of high-speed rotation. Due to the smooth surface and inclined structure of the diversion dam, the oil can "slide and take off", avoiding directly impacting the test wire 5. At the same time, the diversion dam itself has elasticity, which can effectively reduce the damage caused by the oil impact to the body.

[0036] This application can realize the installation of test leads on the non-continuous surface of the rotor surface under the working conditions of a temperature of 1100 °C and a maximum rotational speed of 20000 RPM. This application can solve the problem of reliable installation of test leads under the conditions of the non-continuous surface of the high-speed rotor surface and the erosion of the oil sump, saving the time and economic costs brought by the test modification and hardware production of the engine and the tester, and improving the data acquisition rate.

[0037] Although the present application has been described in detail with general descriptions and specific implementation manners in the above text, on the basis of the present application, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present application all fall within the scope of protection required by the present application.

Claims

1. A high-speed rotor non-continuous profile test lead anti-erosion device. The test lead (5) is introduced from the rotor measurement point (11) through the surface of the wheel disc web (8) into the high-speed slip ring at the axis. The wheel disc web (8) includes a first test piece (1) and a second test piece (2). There is a transition groove (12) between the first test piece (1) and the second test piece (2), and there is an oil sump (13) on the second test piece (2). It is characterized in that, The anti-erosion device includes: A first metal foil (3), welded to the first specimen (1) and the second specimen (2) and spanning the transition groove (12); A second metal foil (4), which is crimped to the first metal foil (3) by welding after attaching the test lead to the first metal foil (3); A third metal foil (7), welded to the bottom of the oil sump (13) and forming a through-hole for accommodating the test lead (5) with the bottom of the oil sump (13); A diversion dam (9), arranged on the side of the third metal foil (7) facing the oncoming oil flow, both ends of the diversion dam (9) being fixed to the surface of the oil sump (13), and the middle part of the diversion dam being bent upward to form an inclined plate, the inclined plate being inclined towards the third metal foil (7); Wherein, a copper bar (6) is arranged in the transition groove (12), and the first metal foil (3) is in contact with the first specimen (1), the second specimen (2) and the copper bar (6).

2. The high-speed rotor non-continuous profile test lead anti-erosion device according to claim 1, characterized in that, Both sides of the first metal foil (3) in the extending direction of the test lead are spot-welded to the first specimen (1) respectively, and each single side connected to the first specimen (1) is provided with double rows of weld spots. Both sides of the first metal foil (3) in the extending direction of the test lead are spot-welded to the second specimen (2) respectively, and each single side connected to the second specimen (2) is provided with double rows of weld spots.

3. The high-speed rotor non-continuous profile test lead anti-erosion device according to claim 1, characterized in that, The second metal foil (4) is larger than the first metal foil (3) in the extending direction of the test lead, the second metal foil (4) covers the first metal foil (3), and the part exceeding the first metal foil (3) is spot-welded to the first specimen (1) and the second specimen (2).

4. The high-speed rotor non-continuous profile test lead anti-erosion device according to claim 1, characterized in that, The diversion dam (9) is spaced 10 - 15 mm from the third metal foil (7).

5. The high-speed rotor non-continuous profile test lead anti-erosion device according to claim 1, characterized in that, The inclination angle of the inclined plate of the diversion dam (9) is 60 - 80°.

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