CN217055953U

CN217055953U - Fluid dynamic pressure bearing with metal rubber and conical wave foil linkage damping

Info

Publication number: CN217055953U
Application number: CN202220536552.4U
Authority: CN
Inventors: 李胜波; 罗远; 西金.安东; 闫辉; 陈照波
Original assignee: Xiamen University of Technology
Current assignee: Xiamen University of Technology
Priority date: 2022-03-11
Filing date: 2022-03-11
Publication date: 2022-07-26
Anticipated expiration: 2032-03-11

Abstract

The utility model relates to a fluid dynamic pressure bearing with metal rubber and circular cone wave foil linkage damping, it includes bearing frame and inside damping subassembly. The internal damping assembly is mounted within the bearing housing. The internal damping assembly comprises a metal rubber damping ring, a structural member and a conical wave foil damping mechanism which are sequentially surrounded from the outer layer to the inner layer and are fixed with each other. The conical wave foil damping mechanism comprises a wavy damping piece and a curved damping piece, wherein the wavy damping piece and the curved damping piece enclose a conical ring to form a conical cavity, and the conical ring can be matched with a conical shaft neck of the rotating shaft. The bearing housing and the internal damping assembly are provided with communicating fluid passages. The bearing is provided with a two-stage linkage damping vibration attenuation structure, wherein the first stage is a friction damper formed by a conical wave foil damping mechanism, the second stage is a metal rubber damping ring, and the two stages act together to enable the bearing to simultaneously bear axial and radial loads, absorb energy and reduce vibration, and enable the rotating shaft to recover to a normal working state in the face of complex working conditions.

Description

Fluid dynamic pressure bearing with metal rubber and conical wave foil linkage damping

Technical Field

The utility model relates to a bearing technical field, in particular to a fluid lubrication slide bearing that is used for high-speed turbine, high frequency non-contact motor, power device turbo generator set, turbo charger of various usage.

Background

Fluid bearings comprise both liquid and gas bearings, the load of which is supported by a rapidly moving thin layer of pressurized liquid or gas between the bearing surfaces. Because there is no contact between the moving parts and therefore no sliding friction, fluid bearings have better friction performance and less wear than many other types of bearings.

Serious accidents caused by dynamic instability of large-sized and high-speed rotating machinery frequently occur at home and abroad. The reasons for dynamic instability of the rotor system mainly come from two points: on one hand, the high-speed rotor system repeatedly runs through the critical rotating speed in the processes of starting, stopping, accelerating and decelerating, so that the rotor system is easy to resonate, wherein a series of fault problems caused by oil film instability (oil film oscillation) caused by the nonlinear oil film force of the sliding bearing are particularly prominent; on the other hand, the working environment of the rotor system of high-speed rotating equipment such as an aircraft engine, a submarine, an aircraft carrier and the like is increasingly complicated and harsh, and the increasingly light and high-speed rotor system is sensitive to multi-factor interference of complex working conditions, so that the dynamic characteristics of the system are changed, and dynamic instability of the rotor system is caused.

The metal rubber material is a homogeneous elastic porous substance, and is made up by using special technological process, and placing the stretched and spiral metal wires in a certain mass in order in a punching or rolling die, then using cold-punching method to make formation. The metal rubber has a space net structure formed by the metal wires which are mutually staggered and hooked, is similar to a macromolecular structure of rubber, has certain rigidity, generates dry friction between the metal wires during vibration, can dissipate a large amount of energy, and plays a role in damping vibration attenuation.

SUMMERY OF THE UTILITY MODEL

When operating, because of the rotor system takes place resonance, complicated operating mode and takes place dynamic unstability in order to improve rotating machinery, cause the problem of accident, the utility model provides a fluid dynamic pressure bearing with metal rubber and circular cone wave foil linkage damping, it includes bearing frame and inside damping subassembly. The internal damping assembly is mounted within the bearing housing. The internal damping assembly comprises a metal rubber damping ring, a structural member and a conical wave foil damping mechanism which are sequentially surrounded from the outer layer to the inner layer and are fixed with each other. The metal rubber damping ring is abutted against the inner circumferential surface of the bearing seat. The conical wave foil damping mechanism comprises wave-shaped and curved-surface damping pieces, wherein the wave-shaped and curved-surface damping pieces enclose a conical ring to form a conical cavity, and the conical ring can be matched with a conical journal of the ring sleeve rotating shaft. The bearing housing and the internal damping assembly are provided with communicating fluid passages leading from the outer surface of the bearing housing into the conical cavity.

As a further improvement of the fluid dynamic pressure bearing with the metal rubber and the conical wave foil linkage damping of the utility model, the conical wave foil damping mechanism comprises a plurality of wave-shaped wave plates and a plurality of curved surface-shaped foil plates; a plurality of wave plates are enclosed into a conical wave plate ring; a plurality of foils are enclosed to form a conical foil ring; the foil ring abuts the wave plate ring.

As a further improvement of the fluid dynamic pressure bearing with metal rubber and conical wave foil linkage damping of the present invention, each of the foils is in the shape of the same curved fan, a plurality of foils are connected end to end, and adjacent foils are partially overlapped to form a conical foil ring and adapted to surround the conical journal; each wave plate is the same wave sector and is arranged on the inner circumferential surface of the structural part; the foil ring is disposed at an inner periphery of the wave plate ring.

As the utility model discloses a have the damped fluid dynamic pressure bearing of metal rubber and circular cone wave foil linkage's further improvement, it is adjacent the wave plate interval sets up, and is a plurality of the wave plate encloses into the toper the wave plate ring.

As a further improvement of the fluid dynamic pressure bearing with metal rubber and conical wave foil linkage damping of the present invention, the conical wave foil damping mechanism includes ten foils and ten wave plates; ten foils are stacked end to form the foil ring; ten of the waveplates are spaced to form a waveplate ring.

As a further improvement of the fluid dynamic pressure bearing with the metal rubber and the conical wave foil linkage damping of the utility model, the structural part comprises a fluid supply ring, a conical bearing bush and a plurality of supporting bars; the conical bearing bush is provided with a conical inner circumferential surface; the supporting bars are evenly embedded on the inner circumferential surface of the conical bearing bush, a fan-shaped conical surface is formed between every two adjacent supporting bars, and the wave plate is embedded between every two adjacent supporting bars in a matched mode.

As a further improvement of the fluid dynamic pressure bearing with the metal rubber and the conical wave foil linkage damping of the utility model, the wave plate is a wave sector with a wave bulge on a single surface, two sides of the wave sector are vertical surfaces, and the vertical surfaces on the two sides are respectively matched with the supporting bars abutted against the two sides; the convex surface of each foil abuts the wave crest of one of the wave plates.

As a further improvement of the fluid dynamic pressure bearing with metal rubber and conical wave foil linkage damping of the present invention, every the wave plate has two wave protrusions.

As a further improvement of the fluid dynamic pressure bearing with the metal rubber and conical wave foil linkage damping of the present invention, the fluid dynamic pressure bearing further comprises an annular large end connection cover and an annular small end connection cover; the large-end connecting cover is sleeved at the large end of the conical journal in a non-contact manner and is respectively and fixedly connected with one end faces of the metal rubber damping ring, the fluid supply ring, the conical bearing bush, the supporting bar, the wave plate and the foil; the small end connecting cover is sleeved on the small end of the conical shaft neck in a non-contact manner and is respectively and fixedly connected with the metal rubber damping ring, the fluid supply ring, the conical bearing bush, the supporting bar, the wave plate and the other end face of the foil.

As a further improvement of the fluid dynamic pressure bearing with the metal rubber and the conical wave foil linkage damping of the utility model, the fluid supply ring comprises a main body ring, a fluid supply pipe and a fluid discharge pipe which are respectively communicated with the main body ring; the fluid supply pipe sequentially penetrates out of the metal rubber damping ring and the bearing seat outwards; the outflow fluid pipe penetrates through the conical bearing bush and the supporting bar inwards in sequence and leads to the conical cavity.

The utility model discloses compare in current fluid bearing's beneficial effect and be: the damping vibration attenuation structure with two-stage linkage is designed, the first-stage damping vibration attenuation structure is a friction damper formed by a conical wave foil damping mechanism, the second-stage damping vibration attenuation structure is a metal rubber damping ring, and the two damping vibration attenuation structures jointly act to enable the bearing to simultaneously bear axial and radial loads, absorb energy, reduce vibration and enable the rotating shaft to recover to a normal working state in the face of complex working conditions. The conical wave foil damping mechanism can adjust axial rigidity and radial rigidity and damping, resonance is prevented, and the metal rubber damping ring has good elasticity and damping performance, is high-temperature resistant, corrosion resistant, non-aging and reliable in operation.

Drawings

Fig. 1 is a schematic sectional view of one embodiment of a hydrodynamic bearing.

Fig. 2 is a schematic view of a middle portion of the hydrodynamic bearing of fig. 1.

Fig. 3 is a cross-sectional view taken along the plane a-a in fig. 2.

FIG. 4 is a schematic diagram of a wave plate.

Fig. 5 is a schematic view of a foil construction.

Fig. 6 is a block diagram illustrating the operation of the hydrodynamic bearing.

Reference numerals are as follows: the bearing comprises a bearing seat upper cover 1, a metal rubber damping ring 2, an annular groove 3, a fluid supply ring 4, a conical bearing bush 5, a large-end connecting cover 6, a bearing base 7, a conical journal 8, a foil 9, a supporting strip 10, a small-end connecting cover 11 and a wave plate 12.

Detailed Description

Some embodiments of the fluid dynamic pressure bearing with metal rubber and conical wave foil linkage damping according to the present invention are described below with reference to the accompanying drawings.

Referring to fig. 1, a hydrodynamic bearing with metal rubber and conical wave foil linkage damping includes bearing seats 1, 7 and an internal damping member. The internal damping assembly is mounted within the bearing housing. The internal damping assembly comprises a metal rubber damping ring 2, a structural member and a conical wave foil damping mechanism which are sequentially surrounded from the outer layer to the inner layer and are fixed with each other. The metal rubber damping ring 2 abuts against the inner circumferential surfaces of the bearing seats 1 and 7. The conical wave foil damping mechanism comprises wave-shaped and curved-surface damping pieces, wherein the wave-shaped and curved-surface damping pieces enclose a conical ring to form a conical cavity, and the conical ring can be matched with a conical shaft neck 8 of the ring sleeve rotating shaft. The bearing housings 1, 7 and the internal damping assembly are provided with communicating fluid passages leading from the outer surface of the bearing housings 1, 7 into the conical cavity.

The fluid dynamic pressure bearing is provided with a two-stage linkage damping vibration attenuation structure, the first-stage damping vibration attenuation structure is a friction damper formed by a cone wave foil damping mechanism, the second-stage damping vibration attenuation structure is a metal rubber damping ring, and the two structures jointly act to enable the bearing to simultaneously bear axial and radial loads, absorb energy, reduce vibration and enable a rotating shaft to recover to a normal working state in the face of complex working conditions. The conical wave foil damping mechanism can adjust axial rigidity and radial rigidity and damping, resonance is prevented, and the metal rubber damping ring has good elasticity and damping performance, is high-temperature resistant, corrosion resistant, non-aging and reliable in operation.

As shown in fig. 1, the bearing seats 1 and 7 include a bearing seat upper cover 1 and a bearing seat 7. The internal damping assembly is installed in the bearing base 7 firstly, and then covers the bearing seat upper cover 1, and the bearing seat upper cover 1 is fixedly connected with the bearing base 7 through bolts.

As shown in fig. 4 and 5, the conical wave foil damping mechanism includes a plurality of waved wave plates 12 and a plurality of curved foil plates 9.

Referring to fig. 3, a plurality of wave plates 12 form a conical wave plate ring; a plurality of foils 9 are enclosed to form a conical foil ring; the foil ring abuts the wave plate ring.

As shown in fig. 5, each of the foils 9 is in the shape of the same curved sector, a plurality of the foils 9 are connected end to end, and adjacent foils 9 are partially overlapped, enclose the conical foil ring and are fittingly surrounded on the periphery of the conical journal 8.

As shown in fig. 4, each of the wave plates 12 has the same wave sector, and each of the wave plates 12 is disposed at the inner circumferential surface of the structural member. The foil ring is disposed at an inner periphery of the wave plate ring.

As shown in fig. 3, adjacent wave plates 12 are spaced apart, and a plurality of wave plates 12 enclose the tapered wave plate ring. In the present embodiment, the taper is a taper whose two ends are in a planar annular shape.

The bearing is characterized in that a two-stage linkage damping vibration attenuation structure is designed aiming at the condition of different rotating speeds of the bearing, the first-stage damping vibration attenuation structure is a friction damper formed by conical wave foils, the second-stage damping vibration attenuation structure is a metal rubber damping ring, the two structures jointly act to enable the bearing to simultaneously bear axial and radial loads, the conical wave foils can adjust axial and radial rigidity and damping, and the metal rubber damping ring has good elasticity and damping performance, is high-temperature resistant, corrosion resistant, non-aging and reliable in operation. During design, the taper angles of the conical bearing bush, the shaft neck and the bump foil can be adjusted, so that the axial and radial load of the bearing and the axial and radial rigidity and damping of the bearing are changed.

As an alternative, the cone wave foil damping mechanism comprises ten foils 9 and ten wave plates 12, as shown in figure 3. Ten of said foils 9 stacked end to end enclose said foil loop. Ten of the wave plates 12 are spaced to form the wave plate ring. Ten conical wave plates 12 and ten conical foil plates 9 are uniformly distributed on the conical shaft journals 8 and play a role in supporting and adjusting. The conical wave foil can bear axial force and radial force, and meanwhile, as can be seen from fig. 4, the cross section of the wave plate 12 is formed by splicing two grooves and two circular arcs and is wavy, micro-displacement is generated in the working state, certain buffering effect is achieved while dry friction damping is generated, and certain elastic damping is provided.

As shown in fig. 1, the structural member includes a fluid supply ring 4, a conical bearing shell 5, and a plurality of support bars 10. The conical bearing shell 5 has a conical inner circumferential surface. Referring to fig. 1 to 3, ten support bars 10 are uniformly embedded on the inner circumferential surface of the conical bearing shell 5, a fan-shaped conical surface is formed between every two adjacent support bars 10, and one wave plate 12 is fittingly embedded between every two adjacent support bars 10.

The wave plate 12 is a wave sector with wave protrusions on one surface, two sides of the wave sector are vertical surfaces, and the vertical surfaces on the two sides are respectively matched and abutted against the supporting bars 10 on the two sides; the convex surface of each foil 9 abuts the wave crest of one of the wave plates 12.

As shown in fig. 4, each wave plate 12 has two wave protrusions, and two ends of each wave protrusion are vertical surfaces inclined slightly inward, and are used for abutting against the supporting bars 10 on two sides to clamp and fix the wave plate 12.

As shown in fig. 1 and 2, the hydrodynamic bearing further includes an annular large end connection cap 6 and an annular small end connection cap 11. The big end connection cover 6 is sleeved on the big end of the conical shaft neck 8 in a non-contact manner, and is respectively and fixedly connected with the metal rubber damping ring 2, the fluid supply ring 4, the conical bearing bush 5, the support bar 10, the wave plate 12 and one end surface of the foil 9, and can be respectively fixed by bolts. The small end connecting cover 11 is sleeved on the small end of the conical shaft neck 8 in a non-contact manner, and is respectively and fixedly connected with the metal rubber damping ring 2, the fluid supply ring 4, the conical bearing bush 5, the supporting bar 10, the wave plate 12 and the other end surface of the foil 9, and can be respectively fixed by bolts.

As an embodiment of the fluid channel, as shown in fig. 1 to 3, the fluid supply ring 4 includes a main body ring and a fluid supply pipe communicated with the main body ring, and the fluid supply pipe sequentially penetrates through the metal rubber damping ring 2 and the bearing seats 1 and 7 to the outside. An outlet groove is formed in the inner side face of the main body ring, symmetrical grooves are formed in the positions, corresponding to the grooves, of the conical bearing bushes 5 to form the annular groove 3, communicated fluid through holes are formed in the conical bearing bushes 5 and the supporting bars 10, the fluid through holes are communicated with the annular groove 3 outwards and communicated with the conical cavity inwards. Fluid through holes may be formed in all the support bars 10, or fluid through holes (as shown in fig. 3) may be formed only in two symmetrical support bars 10, and the conical bearing bushes 5 are provided with fluid through holes in corresponding numbers and positions for communication. Suppose this bearing has set up ten support bars 10, and this bearing adopts 3 circumference oil supply modes of ring channel to supply oil promptly, and ten defeated oil pipes pass the circular cone axle bush equipartitions in circumference. Or, only four support bars 10 at the cross coordinate end of the ten support bars 10 are provided with fluid through holes, the conical bearing bush 5 is provided with corresponding four fluid through holes at corresponding positions for butt joint, namely, the bearing adopts a circumferential oil supply mode of the annular groove 3 to supply oil, four oil conveying pipes penetrate through the conical bearing bush and are uniformly distributed in the circumferential direction, and the oil is introduced to lubricate the conical shaft neck 8 and support the liquid seal thin layer.

As another embodiment of the fluid passage, the fluid supply ring 4 includes a main body ring, and a fluid supply pipe and a fluid discharge pipe respectively communicating with the main body ring. The fluid supply pipe sequentially penetrates out of the metal rubber damping ring 2 and the bearing seats 1 and 7. The outflow pipe penetrates through the conical bearing bushes 5 and the supporting bars 10 inwards in sequence and leads to the conical cavity.

In the normal working mode of the bearing, the conical wave foil can generate friction damping to absorb energy and reduce abnormal vibration under the interaction of the conical wave foil, and in the starting and stopping modes, the shaft is in contact with the supporting surface of the wave foil, and meanwhile, the surface of the wave foil is coated with an anti-friction coating to reduce abrasion. As shown in fig. 6, the specific working principle is as follows: during operation, when the rotating speed of the shaft reaches a first-order critical rotating speed and the amplitude increases to cause abnormal vibration, the wave plate 12 and the friction damper formed by the mutually overlapped foils 9 absorb energy to reduce vibration, so that the bearing can stably pass the first-order critical rotating speed, then the bearing continues to increase the speed, when the rotating speed reaches about twice the first-order critical rotating speed, oil whirl occurs, and the amplitude exceeds a limit, the wave plate 12, the first-order friction damper formed by the mutually overlapped foils 9 and the second-order damper formed by the metal rubber damping ring can jointly act to absorb energy to reduce vibration, and the rotating shaft returns to a normal working state.

The above-described embodiments are intended to be merely exemplary, so as to better enable those skilled in the art to understand the present invention, and should not be construed as limiting the scope of the invention; any equivalent alterations or modifications made according to the spirit of the present invention are all within the scope of the protection claimed in the present invention.

Claims

1. The utility model provides a fluid dynamic pressure bearing with metal rubber and circular cone ripples foil sheet linkage damping which characterized in that: comprising a bearing seat (1, 7) and an internal damping component; the inner damping assembly is mounted in the bearing seat;

the internal damping assembly comprises a metal rubber damping ring (2), a structural member and a conical wave foil damping mechanism which are sequentially surrounded from the outer layer to the inner layer and are fixed with each other; the metal rubber damping ring (2) is abutted against the inner circumferential surface of the bearing seat (1, 7); the conical wave foil damping mechanism comprises wave-shaped and curved-surface damping pieces, the wave-shaped and curved-surface damping pieces surround a conical ring to form a conical cavity, and the conical ring can be matched with a conical shaft neck (8) of the ring sleeve rotating shaft;

the bearing housings (1, 7) and the internal damping assembly are provided with communicating fluid passages leading from the outer surface of the bearing housings (1, 7) into the conical cavity.

2. The fluid dynamic pressure bearing with metal rubber and conical wave foil coordinated damping as claimed in claim 1, wherein: the conical wave foil damping mechanism comprises a plurality of wave-shaped wave plates (12) and a plurality of curved surface-shaped foils (9); the wave plates (12) enclose a conical wave plate ring; a plurality of foils (9) enclose a conical foil ring; the foil ring abuts the wave plate ring.

3. The fluid dynamic pressure bearing with metal rubber and conical wave foil coordinated damping as claimed in claim 2, wherein: each foil (9) is in the shape of the same curved sector, a plurality of foils (9) are connected end to end, and adjacent foils (9) are partially overlapped, surround a conical foil ring and are fittingly wound on the peripheral side of the conical journal (8); each wave plate (12) is the same wave sector, and each wave plate (12) is arranged on the inner circumferential surface of the structural member; the foil ring is disposed at an inner periphery of the wave plate ring.

4. The hydrodynamic bearing with metal rubber and conical wave foil linkage damping according to claim 2 or 3, characterized in that: the adjacent wave plates (12) are arranged at intervals, and the plurality of wave plates (12) enclose a conical wave plate ring.

5. The hydrodynamic bearing with metal rubber and conical wave foil linkage damping according to claim 2 or 3, characterized in that: the conical wave foil damping mechanism comprises ten foils (9) and ten wave plates (12); ten foils (9) are overlapped end to form the foil ring; ten wave plates (12) are spaced to form the wave plate ring.

6. The hydrodynamic bearing with metal rubber and conical wave foil linkage damping of claim 3, wherein: the structural part comprises a fluid supply ring (4), a conical bearing bush (5) and a plurality of supporting bars (10); the conical bearing bush (5) is provided with a conical inner circumferential surface; the supporting strips (10) are uniformly embedded on the inner circumferential surface of the conical bearing bush (5), a fan-shaped conical surface is formed between every two adjacent supporting strips (10), and one wave plate (12) is embedded between every two adjacent supporting strips (10) in a matched manner.

7. The hydrodynamic bearing with metal rubber and conical wave foil linkage damping of claim 6, wherein: the wave plate (12) is a wave sector with wave bulges on one surface, the two sides of the wave sector are vertical surfaces, and the vertical surfaces on the two sides are respectively abutted to the supporting bars (10) on the two sides in a matching manner; the convex surface of each foil (9) abuts the wave-shaped protrusion of one of the wave plates (12).

8. The fluid dynamic pressure bearing with metal rubber and conical wave foil coordinated damping as claimed in claim 7, wherein: each wave plate (12) has two wave bulges.

9. The hydrodynamic bearing with metal rubber and conical wave foil linkage damping of claim 6, wherein: the fluid dynamic pressure bearing also comprises an annular big end connecting cover (6) and an annular small end connecting cover (11); the large-end connecting cover (6) is sleeved on the large end of the conical shaft neck (8) in a non-contact manner and is respectively and fixedly connected with one end face of the metal rubber damping ring (2), the fluid supply ring (4), the conical bearing bush (5), the supporting strip (10), the wave plate (12) and the foil (9); the small end connecting cover (11) is sleeved on the small end of the conical shaft neck (8) in a non-contact manner and is respectively and fixedly connected with the metal rubber damping ring (2), the fluid supply ring (4), the conical bearing bush (5), the supporting strip (10), the wave plate (12) and the other end face of the foil (9).

10. The fluid dynamic pressure bearing with metal rubber and conical wave foil linkage damping as claimed in claim 9, wherein: the fluid supply ring (4) comprises a main body ring, a fluid supply pipe and a fluid discharge pipe which are respectively communicated with the main body ring; the fluid supply pipe sequentially penetrates out of the metal rubber damping ring (2) and the bearing seats (1, 7) outwards; the outflow pipe penetrates through the conical bearing bush (5) and the supporting bar (10) inwards in sequence and leads to the conical cavity.