Permanent magnet array floating ring damper

Abstract

The invention relates to a permanent magnet array floating ring damper which comprises a damper outer ring, a damper shaft neck and a floating ring located between the damper outer ring and the damper shaft neck, a permanent magnet ring is embedded in the floating ring, and the magnetic poles of the inner ring and the outer ring of the permanent magnet ring are opposite. An outer ring permanent magnet array ring and a journal permanent magnet array ring which correspond to the permanent magnet rings are embedded in the damper outer ring and the damper journal respectively, the outer ring permanent magnet array ring comprises an outer ring middle magnet ring and two outer ring edge magnet rings, the journal permanent magnet array ring comprises a journal middle magnet ring and two journal edge magnet rings, and the radial magnetic coupler is connected with the outer ring permanent magnet array ring and the journal permanent magnet array ring. The radial magnetic coupler comprises a block-shaped permanent magnet embedded into the floating ring, an outer ring permanent magnet embedded into the outer ring of the damper and a journal permanent magnet embedded into the journal of the damper, it is guaranteed that the floating ring can still suspend under the condition that the floating ring is not fully lubricated through magnetic force, and the potential solid contact hidden danger is prevented; and the rotation of the floating ring is limited through the radial magnetic coupler.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of squeeze film dampers, in particular to a permanent magnet array floating ring damper. BACKGROUND

[0002] Squeeze film dampers (SFDs) are widely used in aero-engine supporting damping structure devices, which are generally composed of a damper outer ring, a damper inner ring (also known as a damper journal) and the like. The damper inner ring is elastically supported through an elastic squirrel cage, and a rotating shaft is connected to the inner ring of the damper inner ring through a bearing. An oil film is formed between the damper outer ring and the damper inner ring, and oil supply is realized through oil supply holes provided in the damper outer ring. The oil film realizes the damping of the radial movement of the damper inner ring. Thus, by changing the comprehensive stiffness and damping parameters of the supporting components, the dynamic characteristics of the rotor system are improved to realize the improvement of the rotor system overcritical speed capability, damping and reduction of supporting force transmission. An airplane is a 6-degree-of-freedom motion system composed of three mass center movement degrees of freedom and three mass center rotation degrees of freedom. Therefore, in actual flight of the airplane, especially in high-speed or high-overload flight, the squeeze film damper transient eccentricity caused by the complex motion has a great influence on the damping effect. FSFDs can overcome the bistable response and non-coordinated precession of the rotor system caused by the highly nonlinear oil film force of the traditional squeeze film damper.

[0003] Floating ring squeeze film dampers (FSFDs) are provided with a floating ring between the damper outer ring and the damper inner ring, which can overcome the bistable response and non-coordinated precession of the rotor system caused by the highly nonlinear oil film force of the traditional squeeze film damper, suppress cavitation cavitation and improve the oil film nonlinearity. However, compared with ordinary dampers, the floating ring squeeze film damper increases the complexity of the system due to the addition of a movable component, which also causes some potential problems, such as solid contact and friction caused by the positioning pin or boss used to limit the rotation of the floating ring (to prevent damper failure), and other means to limit the rotation of the floating ring, such as the non-circular fixed-width curve floating ring oil film damper of CN119878742A.

[0004] The oil of the squeeze film damper comes from the oil lubrication system of the aero-engine, so there is a possibility of insufficient lubrication when the engine is started or the oil supply is interrupted. The working principle of the FSFDs and the SFDs is both fluid dynamic pressure lubrication, compared with the SFDs, because the FSFDs increase a 6-DOF floating ring, the direct solid contact or impact caused by the gravity, various additional inertia moments and inertia gyroscopic moments generated in the state of the maneuvering flight and the additional excitation force under the condition of insufficient lubrication will reduce the service life of the floating ring and cause damage. SUMMARY

[0005] The present application aims at the deficiencies of the prior art, and provides a permanent magnet array floating ring damper, which guarantees that the floating ring can still float under the condition of insufficient lubrication through magnetic force, and prevents potential solid contact hazards.

[0006] The present application is realized by the following technical scheme, providing a permanent magnet array floating ring damper, which comprises a damper outer ring, a damper shaft neck and a floating ring located between the damper outer ring and the damper shaft neck, the floating ring is embedded with a permanent magnet ring, the magnetic poles of the inner ring and the outer ring of the permanent magnet ring are opposite, the damper outer ring and the damper shaft neck are respectively embedded with an outer ring permanent magnet array ring and a shaft neck permanent magnet array ring corresponding to the permanent magnet ring, the outer ring permanent magnet array ring comprises an outer ring middle magnetic ring and two outer ring side magnetic rings, the outer ring middle magnetic ring is located between the two outer ring side magnetic rings, the magnetic poles of the inner ring and the outer ring of the outer ring middle magnetic ring are opposite and the magnetic pole of the inner ring is the same as that of the outer ring of the permanent magnet ring, the magnetic poles of the two ends of the outer ring side magnetic ring are opposite and the magnetic pole of the end close to the permanent magnet ring is the same as that of the outer ring of the permanent magnet ring; the shaft neck permanent magnet array ring comprises a shaft neck middle magnetic ring and two shaft neck side magnetic rings, the shaft neck middle magnetic ring is located between the two shaft neck side magnetic rings, the magnetic poles of the inner ring and the outer ring of the shaft neck middle magnetic ring are opposite and the magnetic pole of the outer ring is the same as that of the inner ring of the permanent magnet ring, the magnetic poles of the two ends of the shaft neck side magnetic ring are opposite and the magnetic pole of the end close to the permanent magnet ring is the same as that of the inner ring of the permanent magnet ring.

[0007] As an optimization, the positions of the permanent magnet ring, the shaft neck middle magnetic ring and the outer ring middle magnetic ring along the axial direction of the floating ring are the same.

[0008] As an optimization, the permanent magnet ring is provided with two and arranged along the axial direction of the floating ring, and the outer ring permanent magnet array ring and the shaft neck permanent magnet array ring are each provided with two.

[0009] As an optimization, it further comprises a radial magnetic force coupler, the radial magnetic force coupler comprises a block-shaped permanent magnet embedded in the floating ring, an outer ring permanent magnet embedded in the damper outer ring and a shaft neck permanent magnet embedded in the damper shaft neck, the block-shaped permanent magnet, the outer ring permanent magnet and the shaft neck permanent magnet are arranged along the radial direction of the floating ring, the magnetic poles of the ends close to each other of the block-shaped permanent magnet and the outer ring permanent magnet are opposite, and the magnetic poles of the ends close to each other of the block-shaped permanent magnet and the shaft neck permanent magnet are opposite.

[0010] As an optimization, the radial magnetic coupling is provided with at least two groups and is uniformly distributed along the circumference of the floating ring.

[0011] As an optimization, the permanent magnet ring is provided with two and is arranged along the axis of the floating ring, and the block permanent magnet is located between the two permanent magnet rings.

[0012] As an optimization, two annular rectangular grooves are opened on the outer ring of the damper shaft journal, and an O-ring is arranged in the rectangular groove.

[0013] As an optimization, an oil supply hole is opened on the outer ring of the damper, which is located in the middle of the floating ring.

[0014] As an optimization, the floating ring is arranged in the floating ring mounting groove opened on the outer ring of the damper shaft journal.

[0015] As an optimization, the permanent magnet ring is arranged in the middle of the thickness direction of the floating ring.

[0016] The beneficial effects of the present application are: (1) Avoiding solid contact problem, increasing system reliability.

[0017] (2) The damper stiffness can be adjusted by selecting specific permanent magnet materials / size.

[0018] (3) Compact structure, single-sided magnetic field distribution generated by the self-shielding effect of the permanent magnet array, reducing the interference to other devices on the engine.

[0019] (4) Higher space utilization, no need to limit the rotation of the floating ring through additional structure.

[0020] (5) Increase the stiffness of the floating ring, improve the natural frequency of the floating ring, and the applicable rotor system working frequency range is wider. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a cross-sectional view of the present application; Figure 2 is a Figure 1 enlarged view of part A of embodiment 1 of the present application; Figure 3 is a Figure 1 enlarged view of part A of embodiment 2 of the present application; Figure 4 is a structure schematic view of the floating ring, shaft journal permanent magnet array ring, outer ring permanent magnet array ring and radial magnetic coupling of embodiment 2 of the present application; Figure 5 is a front view of the floating ring and radial magnetic coupling of embodiment 2 of the present application; shown in the figure: 1. Floating ring, 2. Damper journal, 3. Damper outer ring, 4. Rectangular groove, 5. Permanent magnet ring, 6. Journal permanent magnet array ring, 7. Outer ring permanent magnet array ring, 8. Oil supply hole, 9. Rotating shaft, 10. Bearing, 11. Radial magnetic coupler. DETAILED DESCRIPTION

[0022] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0023] Example 1: like Figures 1-5 As shown, the permanent magnet array floating ring damper of the present invention includes a damper outer ring 3, a damper shaft neck 2 and a floating ring 1 located between the damper outer ring 3 and the damper shaft neck 2. The inner ring of the damper shaft neck 2 is connected to the rotating shaft 9 through a bearing 10, which provides elastic support for the rotation of the rotating shaft 9.

[0024] An oil film is formed between the damper outer ring 3 and the damper shaft neck 2. The outer ring of the damper shaft neck 2 is provided with two annular rectangular grooves 4. O-rings are installed in the rectangular grooves 4. The oil film is located between the two O-rings, which reduces the outflow of lubricating oil in the oil film. At the same time, the O-rings can also increase the damping of the damper.

[0025] The damper outer ring 3 has an oil supply hole 8 located in the center of the floating ring 1. This hole 8 radially enters the oil film, thereby supplying oil to the oil film. The damper journal 2 has a floating ring mounting groove on its outer ring. The floating ring 1 is located within the groove. The cross-section of the floating ring 1 is rectangular, and both its thickness and length are smaller than the dimensions within the groove, ensuring that the floating ring 1 is surrounded by the oil film.

[0026] Two permanent magnet rings 5 ​​are embedded in the floating ring 1. The two permanent magnet rings 5 ​​are arranged axially along the floating ring 1 and symmetrically arranged along the middle of the floating ring 1. The permanent magnet rings 5 ​​are coaxial with the floating ring 1 and are arranged in the middle of the floating ring 1 in the thickness direction.

[0027] The permanent magnet ring 5 is magnetized by radiation. Figure 2 The arrow in the figure indicates the magnetization direction, which is radial magnetization. Therefore, the magnetic poles of the inner ring and the outer ring of the permanent magnet ring 5 are opposite.

[0028] The outer ring permanent magnet array ring 7 and the journal permanent magnet array ring 6 corresponding to the permanent magnet ring 5 are respectively embedded in the damper outer ring 3 and the damper journal 2. Since two permanent magnet rings 5 ​​are provided, in this embodiment, two outer ring permanent magnet array rings 7 and two journal permanent magnet array rings 6 are provided and each is arranged axially along the floating ring 1.

[0029] like Figure 2As shown, the outer ring permanent magnet array ring 7 includes an outer ring middle magnetic ring and two outer ring side magnetic rings, the outer ring middle magnetic ring is located between the two outer ring side magnetic rings, the outer ring middle magnetic ring and the permanent magnet ring 5 are located at the same position along the axial direction of the floating ring 1, and the two outer ring side magnetic rings are symmetrically arranged on the two sides of the outer ring middle magnetic ring.

[0030] The magnetizing direction of the outer ring middle magnetic ring is shown by an arrow in Figure 2 , which is along the radial direction, and the magnetic poles of the inner ring and the outer ring of the outer ring middle magnetic ring are opposite, and the magnetic pole of the inner ring of the outer ring middle magnetic ring is the same as that of the outer ring of the permanent magnet ring 5, so that the repulsive force applied to the permanent magnet ring 5 by the outer ring middle magnetic ring is along the radial direction.

[0031] The magnetizing direction of the outer ring side magnetic ring is shown by an arrow in Figure 2 , which is along the axial direction, so that the magnetic poles at the two ends of the outer ring side magnetic ring are opposite, and the magnetic pole of the end close to the permanent magnet ring 5 is the same as that of the outer ring of the permanent magnet ring 5; therefore, the outer ring side magnetic ring can apply an axial repulsive force to the permanent magnet ring 5, and the repulsive force applied to the permanent magnet ring 5 by the two outer ring side magnetic rings limits the axial movement of the permanent magnet ring 5, thereby limiting the axial movement of the floating ring 1.

[0032] The shaft neck permanent magnet array ring 6 includes a shaft neck middle magnetic ring and two shaft neck side magnetic rings, the shaft neck middle magnetic ring is located between the two shaft neck side magnetic rings, the shaft neck middle magnetic ring and the permanent magnet ring 5 are located at the same position along the axial direction of the floating ring 1, and the two shaft neck side magnetic rings are symmetrically arranged on the two sides of the shaft neck middle magnetic ring.

[0033] The magnetizing direction of the shaft neck middle magnetic ring is shown by an arrow in Figure 2 , which is along the radial direction, and the magnetic poles of the inner ring and the outer ring of the shaft neck middle magnetic ring are opposite, and the magnetic pole of the outer ring of the shaft neck middle magnetic ring is the same as that of the inner ring of the permanent magnet ring 5, so that the repulsive force applied to the permanent magnet ring 5 by the shaft neck middle magnetic ring is along the radial direction, and the repulsive force applied to the permanent magnet ring 5 by the shaft neck middle magnetic ring and the outer ring middle magnetic ring enables the radial positioning of the permanent magnet ring 5.

[0034] The magnetizing direction of the shaft neck side magnetic ring is shown by an arrow in Figure 2 , which is along the axial direction, so that the magnetic poles at the two ends of the shaft neck side magnetic ring are opposite, and the magnetic pole of the end close to the permanent magnet ring 5 is the same as that of the inner ring of the permanent magnet ring 5. Therefore, the shaft neck side magnetic ring can apply an axial repulsive force to the permanent magnet ring 5, and the repulsive force applied to the permanent magnet ring 5 by the two shaft neck side magnetic rings and the repulsive force applied to the permanent magnet ring 5 by the two outer ring side magnetic rings limit the axial movement of the permanent magnet ring 5, thereby limiting the axial movement of the floating ring 1.

[0035] The oil flows into the oil film from the oil supply hole 8, generates damping, and at the same time carries away the heat generated by the magnetic field eddy current, preventing demagnetization of the permanent magnet.

[0036] Example 2: In order to limit the rotation of the floating ring, the embodiment also comprises radial magnetic couplers 11, which are arranged in at least two groups and are evenly distributed along the circumference of the floating ring 1. In this embodiment, two radial magnetic couplers 11 are arranged at the opposite sides of the floating ring, and the positions of the radial magnetic couplers 11 should avoid all oil supply holes, oil outlet holes and floating ring holes.

[0037] As shown in Figure 3 The radial magnetic couplers 11 comprise block-shaped permanent magnets embedded in the floating ring 1, outer ring permanent magnets embedded in the outer ring 3 of the damper, and shaft neck permanent magnets embedded in the shaft neck 2 of the damper. The block-shaped permanent magnets are located between the two permanent magnet rings 5.

[0038] The block-shaped permanent magnets, the outer ring permanent magnets and the shaft neck permanent magnets are arranged radially along the floating ring 1, and all of them are block-shaped structures. The magnetic poles of the block-shaped permanent magnets and the outer ring permanent magnets that are close to each other are opposite, and the magnetic poles of the block-shaped permanent magnets and the shaft neck permanent magnets that are close to each other are opposite. Therefore, the block-shaped permanent magnets are subjected to opposite attractive forces from the shaft neck permanent magnets and the outer ring permanent magnets, thereby preventing the rotation of the floating ring 1.

[0039] The radial magnetic couplers 11 are mainly used to limit the rotation of the floating ring, and therefore the attractive force generated by the radial magnetic couplers 11 on the floating ring 1 is much smaller than the repulsive force generated by the outer ring permanent magnet array ring 7 and the shaft neck permanent magnet array ring 6 on the floating ring 1.

[0040] Of course, the above description is not limited to the above examples, and the technical features not described in the present application can be realized by or using the prior art, which will not be described here. The above embodiments and drawings are only used to illustrate the technical solutions of the present application and are not a limitation of the present application. The above embodiments and drawings are only used to illustrate the technical solutions of the present application and are not a limitation of the present application. The above embodiments and drawings are only used to illustrate the technical solutions of the present application and are not a limitation of the present application. The above embodiments and drawings are only used to illustrate the technical solutions of the present application and are not a limitation of the present application.

Claims

1. A permanent magnet array floating ring damper, comprising a damper outer ring (3), a damper shaft neck (2), and a floating ring (1) located between the damper outer ring (3) and the damper shaft neck (2), characterized in that: The floating ring (1) is embedded with a permanent magnet ring (5), the inner ring and outer ring of the permanent magnet ring (5) have opposite magnetic poles, the outer ring (3) of the damper and the damper shaft neck (2) are respectively embedded with an outer ring permanent magnet array ring (7) and a shaft neck permanent magnet array ring (6) corresponding to the permanent magnet ring (5), the outer ring permanent magnet array ring (7) includes an outer ring middle magnetic ring and two outer ring side magnetic rings, the outer ring middle magnetic ring is located between the two outer ring side magnetic rings, the inner ring and outer ring of the outer ring middle magnetic ring have opposite magnetic poles and the magnetic pole of the inner ring is aligned with the outer ring of the permanent magnet ring (5). The magnetic poles are the same, the magnetic poles at both ends of the outer ring edge magnetic ring are opposite, and the magnetic pole at one end close to the permanent magnet ring (5) is the same as the magnetic pole of the outer ring of the permanent magnet ring (5); the shaft neck permanent magnet array ring (6) includes a shaft neck middle magnetic ring and two shaft neck edge magnetic rings, the shaft neck middle magnetic ring is located between the two shaft neck edge magnetic rings, the magnetic poles of the inner ring and the outer ring of the shaft neck middle magnetic ring are opposite, and the magnetic pole of the outer ring is the same as the magnetic pole of the inner ring of the permanent magnet ring (5), the magnetic poles at both ends of the shaft neck edge magnetic ring are opposite, and the magnetic pole at one end close to the permanent magnet ring (5) is the same as the magnetic pole of the inner ring of the permanent magnet ring (5).

2. The permanent magnet array floating ring damper according to claim 1, characterized in that: The permanent magnet ring (5), the magnetic ring in the shaft neck, and the magnetic ring in the outer ring are located in the same position along the axial direction of the floating ring (1).

3. The permanent magnet array floating ring damper according to claim 1, characterized in that: Two permanent magnet rings (5) are provided and arranged axially along the floating ring (1), and two outer ring permanent magnet array rings (7) and two shaft neck permanent magnet array rings (6) are provided respectively.

4. The permanent magnet array floating ring damper according to claim 1, characterized in that: The invention also includes a radial magnetic coupler (11), wherein the radial magnetic coupler (11) includes a block permanent magnet embedded in the floating ring (1), an outer ring permanent magnet embedded in the outer ring (3) of the damper, and a shaft neck permanent magnet embedded in the shaft neck (2) of the damper. The block permanent magnet, the outer ring permanent magnet, and the shaft neck permanent magnet are arranged radially along the floating ring (1). The magnetic poles of the block permanent magnet and the outer ring permanent magnet are opposite at one end close to each other, and the magnetic poles of the block permanent magnet and the shaft neck permanent magnet are opposite at one end close to each other.

5. The permanent magnet array floating ring damper according to claim 4, characterized in that: At least two groups of radial magnetic couplers (11) are provided and are evenly distributed along the circumference of the floating ring (1).

6. The permanent magnet array floating ring damper according to claim 4, characterized in that: Two permanent magnet rings (5) are provided and arranged axially along the floating ring (1), and the block permanent magnet is located between the two permanent magnet rings (5).

7. The permanent magnet array floating ring damper according to claim 1, characterized in that: The outer ring of the damper shaft neck (2) is provided with two annular rectangular grooves (4), and O-rings are installed in the rectangular grooves (4).

8. The permanent magnet array floating ring damper according to claim 1, characterized in that: The damper outer ring (3) is provided with an oil supply hole (8) located in the middle of the floating ring (1).

9. The permanent magnet array floating ring damper according to claim 1, characterized in that: The outer ring of the damper shaft neck (2) is provided with a floating ring installation groove, and the floating ring (1) is located in the floating ring installation groove.

10. The permanent magnet array floating ring damper according to claim 1, characterized in that: The permanent magnet ring (5) is arranged in the middle of the floating ring (1) in the thickness direction.

Images