CN112178107A

CN112178107A - Elastic combined piston ring and squeeze film damper thereof

Info

Publication number: CN112178107A
Application number: CN201910604289.0A
Authority: CN
Inventors: 马会防; 万召; 虞磊; 黄巍; 何春亮
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2019-07-05
Filing date: 2019-07-05
Publication date: 2021-01-05
Anticipated expiration: 2039-07-05
Also published as: CN112178107B

Abstract

The invention provides an elastic combined piston ring and an extrusion oil film damper thereof, wherein the elastic combined piston ring comprises at least two piston rings, each piston ring is provided with a fracture, a spring is arranged at the fracture, a boss is arranged on each piston ring, at least two piston rings are combined up and down, the boss is clamped into the corresponding fracture to provide compression force for the spring, and the piston rings shield the corresponding combined fractures. The invention has simple structure, can effectively improve the sealing pressure of the piston ring, enables the extrusion oil to uniformly leak, realizes accurate control on the extrusion oil, improves and improves the damping effect of SFD, and reduces the vibration of the rotor of the aeroengine.

Description

Elastic combined piston ring and squeeze film damper thereof

Technical Field

The invention relates to the field of vibration control of aeroengines, in particular to an elastic combined piston ring and an extrusion oil film damper thereof.

Background

In the prior art, squeeze film dampers damp vibrations based on squeeze films. When the two parallel plates are filled with oil and approach each other at a certain relative speed, a certain pressure will be generated between the two plates due to the squeezing effect. Since the pressure is related to the approaching speed of the pressure, a damping effect is formed, and the squeeze oil film damping based on the principle can absorb vibration energy, convert the vibration energy into heat energy and take away the heat energy by flowing squeeze oil. Squeeze film dampers have long been used in aircraft engines.

One of the core technologies of squeeze film dampers is to control the sealing and leakage of squeeze oil: the sealing is enhanced, so that the damping is increased and the damping effect is improved, but the sealing is too tight, so that the heat converted from the damping is not brought away, and the viscosity of the extrusion oil is reduced by the increase of the heat, so that the damping effect is reduced. If the sealing is too poor, the extrusion oil pressure of the extrusion oil film is low, and the vibration reduction effect is also influenced. Therefore, flow control of squeeze film dampers is one of the key technologies.

Fig. 1 is a schematic diagram of the pressure of a piston ring against the periphery in the prior art. As shown in fig. 1, in the working state, the piston ring generates pressure to the periphery, and a good sealing effect is achieved through the pressure surface.

Fig. 2 is a schematic view of a piston ring free body and a tooling state in the prior art. As shown in fig. 2, in order to generate the pressure, the curvature radius of the piston ring is large before the installation (in a free state), and the pressure is generated by the deformation of the piston ring after the installation.

Fig. 3 is a schematic structural diagram of a piston ring and an internal supporting spring thereof in the prior art. As shown in fig. 3, in order to generate a large sealing pressure, there is a case where an inner supporting spring is disposed inside a piston ring.

FIG. 4 is a common form of pistoning fractures. The piston rings are provided with fractures, the joint form of the fractures is shown in figure 4, and the fractures are main leakage parts of sealing leakage. Because there is only one fracture in the circumferential direction, leakage from the fracture can also result in a non-uniform circumferential leakage.

In view of the above, a new piston ring structure is developed by those skilled in the art to overcome the above technical problems.

Disclosure of Invention

The invention aims to overcome the defects that in the prior art, a piston ring used in an extrusion oil film damper is easy to leak, the circumferential direction of leakage is uneven and the like, and provides an elastic combined piston ring and the extrusion oil film damper thereof.

The invention solves the technical problems through the following technical scheme:

the utility model provides an elasticity combination formula piston ring which characterized in that, elasticity combination formula piston ring includes two at least piston rings, the piston ring has the fracture, fracture department is provided with the spring, be provided with the boss on the piston ring, two at least the piston ring makes up from top to bottom, the boss card is gone into correspondingly in the fracture, to the spring provides compressive force, just the piston ring shelters from and corresponds the fracture of combining together.

According to one embodiment of the invention, one end of the spring is mounted on the inner wall surface of one side of the fracture, the boss is clamped between the spring and the inner wall surface of the other side of the fracture, and the other end of the spring is abutted against the side surface of the boss.

According to one embodiment of the invention, the spring is a wave spring.

According to one embodiment of the invention, the boss is provided on an end face of the piston ring at a distance of 90 ° from the break.

According to one embodiment of the invention, said interruptions are in the form of straight mouths.

According to one embodiment of the invention, said interruptions are in the form of staggered interfaces.

According to one embodiment of the invention, the inner wall surface of one side of the fracture is provided with a convex structure, the inner wall surface of the other side of the fracture is provided with a concave structure, and the convex structure and the concave structure are matched with each other.

According to one embodiment of the invention, the inner wall surfaces of the fracture on both sides are inclined surfaces, and a V-shaped structure is formed between the inclined surfaces and the piston ring.

According to one embodiment of the invention, the other end surface of the piston ring is provided with a plurality of grooves, and the grooves and the bosses are respectively distributed on two opposite end surfaces.

According to one embodiment of the invention, the squeeze film damper comprises a resilient combined piston ring according to any one of claims 1-9, which is mounted between an inner ring and an outer ring of the squeeze film damper.

The positive progress effects of the invention are as follows:

the elastic combined piston ring and the squeeze film damper thereof have simple structures, can effectively improve the sealing pressure of the piston ring, enable the squeeze oil to uniformly leak, realize accurate control on the squeeze oil, improve the damping effect of SFD and reduce the vibration of an aeroengine rotor.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings in which like reference numerals denote like features throughout the several views, wherein:

fig. 1 is a schematic diagram of the pressure of a piston ring against the periphery in the prior art.

Fig. 2 is a schematic view of a piston ring free body and a tooling state in the prior art.

Fig. 3 is a schematic structural diagram of a piston ring and an internal supporting spring thereof in the prior art.

FIG. 4 is a common form of pistoning fractures.

Fig. 5 is a schematic structural view of the elastic combined piston ring of the present invention.

Fig. 6 is an assembled view of the elastic combined piston ring of the present invention.

Fig. 7 is a schematic view of the assembled structure of the combined elastic piston ring of the present invention.

FIG. 8 is a schematic view of the squeeze film damper of the present invention.

FIG. 9 is a squeeze oil flow path diagram of a squeeze oil film damper of the present invention.

Fig. 10 is a schematic view showing the break of the elastic combined piston ring of the present invention in the form of a straight line.

Fig. 11 is a schematic view showing the fracture of the elastic combined piston ring of the present invention as a staggered joint.

[ reference numerals ]

Piston ring 10

Fracture 11

Spring 20

Boss 12

Projecting structure 111

Recessed structure 112

Bevel 113

Groove 14

Squeeze film damper inner ring 30

Squeeze film damper outer ring 40

Rolling bearing 50

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

Further, although the terms used in the present invention are selected from publicly known and used terms, some of the terms mentioned in the description of the present invention may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein.

Furthermore, it is required that the present invention is understood, not simply by the actual terms used but by the meaning of each term lying within.

Fig. 5 is a schematic structural view of the elastic combined piston ring of the present invention. Fig. 6 is an assembled view of the elastic combined piston ring of the present invention. Fig. 7 is a schematic view of the assembled structure of the combined elastic piston ring of the present invention. FIG. 8 is a schematic view of the squeeze film damper of the present invention. FIG. 9 is a squeeze oil flow path diagram of a squeeze oil film damper of the present invention. Fig. 10 is a schematic view showing the break of the elastic combined piston ring of the present invention in the form of a straight line. Fig. 11 is a schematic view showing the fracture of the elastic combined piston ring of the present invention as a staggered joint.

As shown in fig. 5 to 10, the present invention discloses an elastic combined piston ring, which comprises at least two piston rings 10, wherein the piston ring 10 has a fracture 11, a spring 20 is arranged at the fracture 11, and a boss 12 is arranged on the piston ring 10. At least two piston rings 10 of the structure are combined up and down, the lug bosses 12 are clamped into the corresponding fracture 11 to provide a compression force for the spring 20, and the piston rings 10 shield the corresponding combined fracture 11.

Preferably, one end of the spring 20 is mounted on the inner wall surface of one side of the fracture 11, the boss 12 is clamped between the spring 20 and the inner wall surface of the other side of the fracture 11, and the other end of the spring 20 abuts against the side surface of the boss 12. The spring 20 here is preferably a wave spring.

Further, a boss 12 is provided on one end face of the piston ring 10 at a position 90 ° apart from the fracture 11. The form of the interruptions 11 can preferably be straight or staggered.

Specifically, the inner wall surface of one side of the fracture 11 is provided with a convex structure 111, the inner wall surface of the other side of the fracture 11 is provided with a concave structure 112, and the convex structure 111 and the concave structure 112 are matched with each other.

In particular, in the present embodiment, the inner wall surfaces of the fracture 11 are both inclined surfaces 113, and a V-shaped structure is formed between the inclined surfaces 113 and the piston ring 10.

The concave-convex structure can avoid the radial mutual dislocation of the interface, the V-shaped structure can avoid the up-and-down dislocation of the interface, and the interface can not loosen along the circumferential direction under the action of the elastic force, so that the contact state of the interface is stable.

Furthermore, the other end surface of the piston ring 10 is provided with a plurality of grooves 14, and the grooves 14 and the bosses 12 are respectively distributed on two opposite end surfaces.

According to the structural description, the elastic combined piston ring is provided with the wave-shaped spring at the ring fracture, and the spring is compressed during assembly and provides tangential elastic force after compression, so that the piston ring generates pressure on the periphery. Also, a boss is provided at a position spaced approximately 90 degrees from the break, and provides a compressive force to the spring when combined with another piston ring like that. By the combination of piston rings, the break of each piston ring is shielded by the other piston ring, so that the piston ring combination has no leakage all around the circumference.

The invention also discloses a squeeze film damper, which comprises the elastic combined piston ring, wherein the elastic combined piston ring is arranged between the inner ring 30 of the squeeze film damper and the outer ring 40 of the squeeze film damper.

Specifically, the piston ring is assembled and then installed in the squeeze film damper, and in order to adjust the flow path cross section and control the flow rate, grooves 14, for example, in the form of small shallow grooves, are formed on the side surface of the piston ring and are distributed uniformly in the axial direction. The rolling bearing 50 is mounted within the inner ring 30 of the squeeze film damper.

As described above, the elastic combined piston ring and squeeze film damper thereof according to the present invention have various advantages:

the piston ring is provided with a circumferential elastic device, so that larger tangential elastic force can be provided, and the sealing pressure of the piston ring is larger;

secondly, the two rings are combined, so that the circumferential distribution of the sealing pressure is more uniform, and the uneven leakage of the squeeze film damper is improved;

thirdly, the flow path of the extrusion oil when flowing out is lengthened and bent, so that the possibility of air entering the extrusion oil film is reduced, and the damping characteristic is improved;

fourthly, the piston ring interface can realize radial, axial and circumferential fixation, and the structural stability is good;

compared with a piston ring with an internal supporting spring, the elastic part and the piston ring are integrated, and the structure is simple.

In conclusion, the elastic combined piston ring and the squeeze film damper thereof have simple structures, can effectively improve the sealing pressure of the piston ring, enable the squeeze oil to uniformly leak, realize accurate control on the squeeze oil, improve and improve the damping effect of SFD and reduce the vibration of an aeroengine rotor.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims

1. The utility model provides an elasticity combination formula piston ring, its characterized in that, elasticity combination formula piston ring includes two at least piston rings, the piston ring has the fracture, fracture department is provided with the spring, be provided with the boss on the piston ring, at least two the piston ring makes up from top to bottom, the boss card is gone into correspondingly in the fracture, to the spring provides compressive force, just the piston ring shelters from and corresponds the combination together the fracture.

2. The piston ring as claimed in claim 1, wherein one end of the spring is mounted on an inner wall surface of one side of the gap, the boss is engaged between the spring and the inner wall surface of the other side of the gap, and the other end of the spring abuts against a side surface of the boss.

3. The elastomeric composite piston ring of claim 1, wherein said spring is a wave spring.

4. The elastomeric composite piston ring of claim 1, wherein said boss is disposed on an end face of said piston ring at a 90 ° spacing from said discontinuity.

5. The elastomeric composite piston ring as set forth in claim 1, wherein said discontinuity is in the form of a straight cut.

6. The elastomeric composite piston ring as set forth in claim 1, wherein said discontinuity is in the form of a staggered joint.

7. The assembled piston ring as set forth in claim 6, wherein said discontinuity is provided at an inner wall surface at one side thereof with a convex structure, and at an inner wall surface at the other side thereof with a concave structure, and said convex structure and said concave structure are matched with each other.

8. The elastomeric combined piston ring as set forth in claim 7, wherein said discontinuity has a slope on both side inner wall surfaces, and a V-shaped configuration is formed between said slope and said piston ring.

9. An elastic combined piston ring as claimed in claim 4, wherein a plurality of grooves are formed on the other end surface of the piston ring, and the grooves and the bosses are respectively formed on two opposite end surfaces.

10. A squeeze film damper, characterized in that it comprises a resilient composite piston ring according to any one of claims 1-9, which is mounted between an inner ring and an outer ring of the squeeze film damper.