A hairpin elastic support stiffness simulation device with adjustable stiffness

Abstract

The present application belongs to the technical field of aero-engine testing, and specifically relates to a hairpin-type elastic support stiffness simulation device with adjustable stiffness. The device comprises a bearing seat (1), a ball bearing (2) and a spiral sealing sleeve (3), wherein the bearing seat (1) comprises an inner ring (11), an outer ring (12) and a plurality of hairpins (13), wherein the outer ring surface of the inner ring (11) and the inner ring surface of the outer ring (12) are respectively provided with a plurality of slots (111) arranged along the circumferential direction on the same installation side, wherein each hairpin (13) comprises two parallel arms (131), wherein the two arms are connected to each other at one end and an elastic fulcrum that can approach or move away from each other is formed at the other end, wherein each elastic fulcrum is provided with a protrusion (132) on the side facing away from each other, wherein one protrusion is installed in the slot on the outer ring surface of the inner ring (11), and the other protrusion is installed in the slot on the inner ring surface of the outer ring (12). The present application can realize rapid adjustment of the rotor support stiffness by changing the number of support hairpins.

Description

Technical Field

[0001] The present application belongs to the technical field of aero-engine testing, and in particular relates to a hairpin-type elastic support stiffness simulation device with adjustable stiffness. Background Art

[0002] As the performance of aircraft engines continues to improve, the loads they bear are getting bigger and bigger, and vibration problems are becoming more and more obvious. For example, vibration problems caused by rotor system imbalance, misalignment, and friction are increasingly restricting the progress of aircraft engine technology. In the study of engine rotor vibration problems, due to the complex structure of the rotor system, high production costs of various structural parts, long processing cycles, and limited direct and accurate testing, it is neither economical nor realistic to directly test the vibration characteristics of real engines, and it is extremely difficult to carry out experimental research.

[0003] How to reflect the real dynamic characteristics of the engine economically and effectively, and discover and solve the dynamic behavior and fault problems of real aircraft engines, is one of the important research contents in the field of aircraft engine tester design. In engineering research, it is very necessary to simulate the vibration conditions of typical engine rotors on rotor testers, and simulating the rotor support stiffness by designing elastic support structures has become the most practical test method. In the design of aircraft engine elastic support structures, commonly used elastic support structures include squirrel cage elastic support structures, elastic ring structures, etc.

[0004] In terms of technology, since the real support state needs to simulate the lower support stiffness under the engine state, the squirrel cage elastic support needs to design longer cage bars, which requires a larger space, increasing the difficulty of bearing lubrication and sealing. At the same time, once the cage bars of the squirrel cage support are broken, it is easy to cause serious consequences such as the rotor flying out; the elastic ring support structure has a thin wall thickness and poor processing technology. The support stiffness is greatly affected by the processing accuracy and the matching state between parts. It is easy for the real support stiffness to deviate significantly from the design stiffness, resulting in the inability to effectively simulate the real vibration behavior of the rotor. In terms of cost, if the existing elastic support structure needs to adjust the support stiffness, multiple elastic supports need to be processed, which is less economical. Summary of the invention

[0005] In order to solve the above problems, the present application provides a hairpin-type elastic support stiffness simulation device with adjustable stiffness, which simulates the support stiffness of the rotor under the working state of the engine. It has the stiffness adjustment capability and can quickly realize the support stiffness adjustment.

[0006] The present application discloses a hairpin-type elastic support stiffness simulation device with adjustable stiffness, which mainly comprises a bearing seat, a ball bearing and a spiral sealing sleeve, wherein the ball bearing is arranged in the bearing seat to form a bearing structure, and the bearing structure is installed on the engine rotor drive shaft, one end of the spiral sealing sleeve is fixed on the bearing structure, and the other end is dynamically sealed with the engine rotor drive shaft, wherein the bearing seat comprises an inner ring, an outer ring and a plurality of hairpins, the outer ring surface of the inner ring and the inner ring surface of the outer ring are respectively provided with a plurality of slots arranged along the circumferential direction on the same installation side, each hairpin comprises two parallel arms, the two arms are connected to each other at one end, and the other end forms an elastic fulcrum that can approach or move away from each other, and each elastic fulcrum is provided with a protrusion on the side away from each other, one of the protrusions is installed in the slot on the outer ring surface of the inner ring, and the other protrusion is installed in the slot on the inner ring surface of the outer ring.

[0007] Preferably, the bearing seat further comprises a cover plate, which is an annular structure and is fixedly mounted on the mounting side of the inner ring and / or the outer ring to lock the protrusion of the hairpin in the slot.

[0008] Preferably, the cover plate includes an inner ring cover plate and an outer ring cover plate, the inner side of the annular structure of the inner ring cover plate is fixed to the inner ring, and the outer side is pressed against the protrusion in the slot on the outer ring surface of the inner ring, and the outer side of the annular structure of the outer ring cover plate is fixed to the outer ring, and the inner side is pressed against the protrusion in the slot on the inner ring surface of the outer ring.

[0009] Preferably, the cover plate is fixed to the inner ring and / or the outer ring by screws.

[0010] Preferably, the inner ring surface of the inner ring has an internal thread, and a stop arm extending toward the center is provided on one side, the locking nut is mounted on the inner ring surface of the inner ring, and the ball bearing is mounted between the stop arm and the locking nut.

[0011] Preferably, the spiral sealing sleeve is provided with a through hole, and an oil spray pipe is installed at the through hole. The oil spray pipe is used to transport the lubricating oil into the rotor drive shaft and throw the lubricating oil to the ball bearing through the oil throwing hole of the rotor drive shaft.

[0012] Preferably, the bearing seat is also provided with an oil return hole, and when the bearing seat is mounted on the rotor drive shaft of the engine, the oil return hole is located at the bottom.

[0013] Preferably, the spiral sealing sleeve is connected to the bearing seat via a bearing seat end cover.

[0014] The present application can effectively simulate the support stiffness of the rotor engine on the rotating tester, and can quickly adjust the rotor support stiffness by changing the number of support clips without changing the outer dimensions of the bearing seat, and has good interchangeability and economy. On the other hand, the present application provides effective lubrication and sealing for the bearing, ensuring stable and reliable operation of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a preferred embodiment of the hairpin-type elastic support stiffness simulation device with adjustable stiffness of the present application.

[0016] Figure 2 This application Figure 1 An exploded view of the bearing seat structure of the illustrated embodiment.

[0017] Figure 3 This application Figure 2 A forward schematic diagram of the bearing seat structure of the illustrated embodiment after assembly.

[0018] Figure 4 This application Figure 2 A rearward schematic diagram of the bearing seat structure of the illustrated embodiment after assembly.

[0019] Figure 5 It is a schematic diagram of the test device of the hairpin-type elastic support stiffness simulation device of the present application.

[0020] Among them, 1-bearing seat, 11-inner ring, 111-slot, 112-block arm, 12-outer ring, 13-hairpin, 131-support arm, 132-protrusion, 14-cover plate, 2-ball bearing, 3-spiral sealing sleeve, 4-locking nut, 5-injection pipe, 6-rotor drive shaft, 7-oil throwing hole, 8-oil return hole, 9-bearing seat end cover, 10-spiral seal, s1-hairpin bearing seat, s2-base, s3-bearing, s4-loading assembly, s5-loading nut, s6-force sensor, s7-suspension, s8-micrometer. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the implementation of this application will be described in more detail in combination with the drawings in the implementation of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described implementation is a part of the implementation of this application, not all of the implementations. The implementation described below with reference to the drawings is exemplary and is intended to be used to explain this application, and cannot be understood as a limitation on this application. Based on the implementation in this application, all other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The implementation of this application is described in detail below in combination with the drawings.

[0022] The present application provides a hairpin-type elastic support stiffness simulation device with adjustable stiffness, such as Figure 1 As shown, it includes a bearing seat 1, a ball bearing 2 and a spiral sealing sleeve 3. The ball bearing 2 is arranged in the bearing seat 1 to form a bearing structure, and the bearing structure is installed on the engine rotor drive shaft 6. One end of the spiral sealing sleeve 3 is fixed on the bearing structure, and the other end is dynamically sealed with the engine rotor drive shaft 6. Figure 1 The position of the spiral seal 10 in the.

[0023] In order to effectively simulate the real vibration characteristics of the rotor under engine conditions on the rotating tester, the present application flexibly supports the test rotor and adopts a hairpin spoke structure to reduce the support stiffness of the bearing seat. Figure 2-Figure 4 The bearing seat 1 includes an inner ring 11, an outer ring 12 and a plurality of hairpins 13. The outer ring surface of the inner ring 11 and the inner ring surface of the outer ring 12 are respectively provided with a plurality of slots 111 arranged along the circumferential direction on the same installation side. Each hairpin 13 includes two parallel arms 131. The two arms are connected to each other at one end and form an elastic fulcrum that can approach or move away from each other at the other end. Each elastic fulcrum is provided with a protrusion 132 on the side away from each other, one of which is installed in the slot on the outer ring surface of the inner ring 11, and the other is installed in the slot on the inner ring surface of the outer ring 12.

[0024] In the design process of the hairpin bearing seat, in order to ensure that the real stiffness of the rotor can be effectively simulated, the finite element method is used for parametric design of the bearing seat. The size and number of "hairpins" along the circumference are used as design parameters. By adjusting the design parameters, the support stiffness is ensured to be the same as the rotor support stiffness in the engine. The use of parametric design technology can quickly design the structure of the hairpin bearing seat for different support stiffness. Considering the symmetry of the support structure and load, in order to simplify the calculation, half of the model can be used for analysis.

[0025] In some optional embodiments, the bearing seat 1 also includes a cover plate 14, which is an annular structure and is fixedly mounted on the mounting side of the inner ring 11 and / or the outer ring 12 to lock the protrusion 132 of the hairpin 13 in the slot.

[0026] In this embodiment, in the structural design of the bearing seat, in order to facilitate the rapid adjustment of the bearing seat support stiffness, the hairpin-type bearing seat is designed to be composed of four parts: an inner ring, an outer ring, a hairpin and a cover plate. Figure 2 Slots that match the hairpin are designed on the outer surface of the inner ring and the inner surface of the outer ring. After the elastic hairpin is inserted, it is pressed with a cover plate. The assembled hairpin bearing seat is as shown in Figure 3 and Figure 4 According to the required support stiffness, different numbers of hairpins can be inserted to quickly adjust the support stiffness, while saving test costs.

[0027] In some optional embodiments, the cover plate 14 includes an inner ring cover plate and an outer ring cover plate. The inner side of the annular structure of the inner ring cover plate is fixed to the inner ring 11, and the outer side is pressed against the protrusion in the slot on the outer ring surface of the inner ring 11; the outer side of the annular structure of the outer ring cover plate is fixed to the outer ring 12, and the inner side is pressed against the protrusion in the slot on the inner ring surface of the outer ring 12.

[0028] In some optional embodiments, the cover plate 14 is fixed to the inner ring 11 and / or the outer ring 12 by screws.

[0029] In some optional embodiments, reference Figure 1 and Figure 2 The inner ring surface of the inner ring 11 has an internal thread, and a stop arm 112 extending toward the center is provided on one side, the locking nut 4 is mounted on the inner ring surface of the inner ring 11, and the ball bearing 2 is mounted between the stop arm 112 and the locking nut 4. In this embodiment, an internal thread is designed at one end of the bearing seat, and the stable installation of the bearing is achieved through the locking nut.

[0030] In some optional embodiments, a through hole is provided on the spiral sealing sleeve 3, and an oil injection pipe 5 is installed at the through hole. The oil injection pipe 5 is used to transport the lubricating oil into the rotor drive shaft 6 and throw the lubricating oil to the ball bearing 2 through the oil throwing hole 7 of the rotor drive shaft 6.

[0031] In some optional embodiments, the bearing seat 1 is further provided with an oil return hole 8. When the bearing seat 1 is installed on the rotor drive shaft 6 of the engine, the oil return hole 8 is located at the bottom.

[0032] The bearings are lubricated by oil injection through the oil injection pipe. The oil supply position, oil supply amount and local structure of the oil injection pipe are consistent with those of the engine. An oil-slinging hole is designed on the test shaft. During the operation of the rotor, the lubricating oil enters the bearing along the oil-slinging hole for lubrication under the action of centrifugal load. An oil return hole is designed at the bottom of the hairpin bearing seat. During operation, the lubricating oil returns to the oil tank by gravity.

[0033] In some optional embodiments, the spiral sealing sleeve 3 is connected to the bearing seat 1 through the bearing seat end cover 9. In this embodiment, spiral sealing sleeves are designed on both sides of the bearing seat to prevent lubricating oil from overflowing from both sides. Figure 1 The spiral sealing sleeve 3 on the right side of the bearing seat 1 is connected to the bearing seat 1 through a locking nut, and the spiral sealing sleeve 3 on the left side of the bearing seat 1 is first connected to the bearing seat end cover 9 through screws, and the bearing seat end cover 9 is clamped on the outer end surface of the bearing seat 1 through a stop.

[0034] Figure 5 The schematic diagram of the test device of the hairpin elastic support stiffness simulation device is given. In order to verify that the support stiffness of the hairpin bearing seat meets the design requirements, a hairpin bearing seat support stiffness test device is designed. The hairpin bearing seat s1 is installed on the base s2. The hairpin bearing seat s1 is installed with a bearing s3. The loading assembly s4 is connected to the bearing s3 and the loading nut s5 through a one-two connecting rod structure. The loading assembly s4 bears gravity through the hanging s7. The radial load is transferred to the test piece (hairpin bearing seat s1) through the loading assembly s4 by adjusting the loading nut s5. The radial load is fed back by the force sensor s6, and the loading displacement is measured by the micrometer s8. The ratio of radial load to displacement is the radial support stiffness of the hairpin bearing seat.

[0035] The present application designs a hairpin-type elastic bearing seat, which can effectively simulate the support stiffness of the rotor under the state of the rotor engine on a rotating tester; this type of elastic bearing seat structure can quickly adjust the rotor support stiffness by changing the number of support hairpins without changing the outer dimensions of the bearing seat, and has good interchangeability and economy; the present application proposes a parametric design method for elastic bearing seats based on finite element analysis, which can significantly improve the design efficiency; the present application provides an effective lubrication and sealing method to ensure the stable and reliable operation of the bearing; this type of bearing seat can be used to carry out various rotor vibration characteristic tests, such as the vibration response characteristic test of the unbalanced amount, the test of the dynamic influence of the centering state on the rotor, etc.

[0036] Although the present application has been described in detail above with general descriptions and specific implementation schemes, it is obvious to those skilled in the art that some modifications or improvements may be made to the present application. Therefore, these modifications or improvements made without departing from the spirit of the present application all fall within the scope of protection claimed in the present application.

Claims

1. A hairpin elastic support stiffness simulation device with adjustable stiffness, comprising a bearing seat (1), a ball bearing (2) and a spiral sealing sleeve (3), wherein the ball bearing (2) is arranged in the bearing seat (1) to form a bearing structure, and the bearing structure is installed on an engine rotor drive shaft (6), one end of the spiral sealing sleeve (3) is fixed on the bearing structure, and the other end is dynamically sealed with the engine rotor drive shaft (6), characterized in that: The bearing seat (1) comprises an inner ring (11), an outer ring (12) and a plurality of hairpins (13); the outer ring surface of the inner ring (11) and the inner ring surface of the outer ring (12) are respectively provided with a plurality of slots (111) arranged along the circumferential direction on the same mounting side; each hairpin (13) comprises two parallel support arms (131); the two support arms are connected to each other at one end and form an elastic fulcrum that can approach or move away from each other at the other end; each elastic fulcrum is provided with a protrusion (132) on a side facing away from each other; one of the protrusions is installed in the slot on the outer ring surface of the inner ring (11), and the other protrusion is installed in the slot on the inner ring surface of the outer ring (12); The supporting stiffness of the bearing seat (1) is adjusted by inserting different numbers of hairpins (13) into the outer surface of the inner ring (11) and the inner surface of the outer ring (12).

2. The hairpin-type elastic support stiffness simulation device with adjustable stiffness as claimed in claim 1, characterized in that: The bearing seat (1) further comprises a cover plate (14) which is an annular structure and is fixedly mounted on the mounting side of the inner ring (11) and / or the outer ring (12) to lock the protrusion (132) of the hairpin (13) in the slot.

3. The hairpin-type elastic support stiffness simulation device with adjustable stiffness as claimed in claim 2, characterized in that: The cover plate (14) comprises an inner ring cover plate and an outer ring cover plate, wherein the inner side of the annular structure of the inner ring cover plate is fixed to the inner ring (11), and the outer side is pressed against a protrusion in a slot on the outer ring surface of the inner ring (11); the outer side of the annular structure of the outer ring cover plate is fixed to the outer ring (12), and the inner side is pressed against a protrusion in the slot on the inner ring surface of the outer ring (12).

4. The hairpin-type elastic support stiffness simulation device with adjustable stiffness as claimed in claim 2, characterized in that: The cover plate (14) is fixed on the inner ring (11) and / or the outer ring (12) by means of screws.

5. The hairpin-type elastic support stiffness simulation device with adjustable stiffness as claimed in claim 1, characterized in that: The inner ring surface of the inner ring (11) has an internal thread, and a stop arm (112) extending toward the center is arranged on one side. The locking nut (4) is installed on the inner ring surface of the inner ring (11), and the ball bearing (2) is installed between the stop arm (112) and the locking nut (4).

6. The hairpin-type elastic support stiffness simulation device with adjustable stiffness as claimed in claim 1, characterized in that: The spiral sealing sleeve (3) is provided with a through hole, and an oil injection pipe (5) is installed at the through hole. The oil injection pipe (5) is used to transport the lubricating oil into the rotor drive shaft (6) and to throw the lubricating oil toward the ball bearing (2) through the oil throwing hole (7) of the rotor drive shaft (6).

7. The hairpin-type elastic support stiffness simulation device with adjustable stiffness as claimed in claim 1, characterized in that: The bearing seat (1) is also provided with an oil return hole (8); when the bearing seat (1) is mounted on the rotor drive shaft (6) of the engine, the oil return hole (8) is located at the bottom.

8. The hairpin-type elastic support stiffness simulation device with adjustable stiffness as claimed in claim 1, characterized in that: The spiral sealing sleeve (3) is connected to the bearing seat (1) via a bearing seat end cover (9).

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