CN209908992U - Elastic supporting mechanism and dynamic pressure gas thrust bearing - Google Patents

Abstract

The application belongs to the technical field of mechanical equipment, and particularly relates to an elastic supporting mechanism and a dynamic pressure gas thrust bearing. The existing foil bearing is usually of a flat foil type, a cantilever type or a wave foil type, has both flexible characteristic and structural rigidity, and has certain bearing capacity and stability. But the structural design is complex, the manufacturing precision requirement and the cost are high, and simultaneously the rigidity and the damping are not completely adjustable at any position in the axial direction, the circumferential direction and the radial direction. The application provides an elastic supporting mechanism which comprises a flat foil assembly and an elastic cylinder foil set which are sequentially stacked, wherein the flat foil assembly comprises a plurality of flat foils, the elastic cylinder foil set comprises a plurality of elastic cylinder foil assemblies, the elastic cylinder foil assemblies are stacked and arranged, and the elastic cylinder foil assembly comprises a plurality of elastic cylinder foils; the elastic cylinder foil comprises an elastic cylinder surface, a plurality of through holes are formed in the elastic cylinder surface and connected with one side of the bending portion, and the bending portion is convex. The integration processing is convenient, and the assembly and the replacement are easy.

Description

Elastic supporting mechanism and dynamic pressure gas thrust bearing

Technical Field

The application belongs to the technical field of mechanical equipment, and particularly relates to an elastic supporting mechanism and a dynamic pressure gas thrust bearing.

Background

The foil dynamic pressure gas bearing adopts gas as a lubricant, has a flexible working surface, and can deform the bearing surface under different rotating speeds and loads, so that the change of the working condition can be adapted by changing the thickness and the rigidity of a gas film in a bearing gap. Through the deformation of the foil elements and the action of mutual coulomb friction force, the foil bearing can absorb redundant energy, so that the bearing-rotor system keeps higher stability in a certain vibration impact and whirling range. Compared with a rigid surface hydrodynamic gas bearing, the foil hydrodynamic gas bearing has the following characteristics: when the bearing is unstable, the flexible foil bearing surface can be damaged non-catastrophically, and the rotor cannot be influenced; the bearing clearance is increased along with the increase of the rotating speed, and the temperature rise and the power consumption are smaller under the high rotating speed, so that the bearing has longer service life and better working performance. With the same bearing gap, the foil bearing has a greater bearing capacity.

The existing foil bearing usually adopts a flat foil type, a cantilever type or a wave foil type bent rolling part, has both flexibility and structural rigidity, and has certain bearing capacity and stability. But the structural design is complex, the manufacturing precision requirement and the cost are high, and simultaneously the rigidity and the damping are not completely adjustable at any position in the axial direction, the circumferential direction and the radial direction.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved

The existing foil bearing usually adopts a flat foil type, a cantilever type or a wave foil type bent rolling part, has both flexible characteristic and structural rigidity, and has certain bearing capacity and stability. But structural design is complicated, manufacturing accuracy requires and with high costs, rigidity and damping are not the problem that axial, circumference and radial optional position are totally adjustable simultaneously, and the application provides an elastic support mechanism and dynamic pressure gas thrust bearing.

2. Technical scheme

In order to achieve the above object, the present application provides an elastic support mechanism, which includes a flat foil assembly and an elastic cylinder foil assembly stacked in sequence, where the flat foil assembly includes a plurality of flat foils, the elastic cylinder foil assembly includes a plurality of elastic cylinder foil assemblies, the elastic cylinder foil assemblies are stacked in layers, and the elastic cylinder foil assembly includes a plurality of elastic cylinder foils;

the elastic cylinder foil comprises an elastic cylinder surface, a plurality of through holes are formed in the elastic cylinder surface, the through holes are connected with one side of the bending portion, and the bending portion is in a convex shape.

Optionally, the other side of the bending part is in contact with an upper layer of elastic cylinder foil or flat foil, and through holes of the elastic cylinder foil groups of each layer are arranged in a staggered manner.

Optionally, the arrangement of the bending portions includes radial rows, circumferential rows or circumferential rows.

Optionally, the flat foils are fan-shaped, the number of the flat foils is three or more, and the cross section of the flat foil assembly is circular; the elastic cylinder foil assembly is fan-shaped, the number of the elastic cylinder foils is six or more than six, the number of the elastic cylinder foil assemblies is more than two layers, and the cross section of each elastic cylinder foil assembly is circular.

Optionally, the bent portion is a hollow cylinder, and the bent portion is fixedly connected to the through hole.

Optionally, the through hole is rectangular, and the bent portion is formed by layering a single circle of single layer or multiple circles of layers.

Optionally, a first connecting plate is arranged on the flat foil, the first connecting plate is connected with one end of the surface of the flat foil, and the other end of the surface of the flat foil is free; and a second connecting plate is arranged on the elastic cylinder foil and is connected with one end of the surface of the elastic cylinder, and the other end of the surface of the elastic cylinder is free.

The application still provides a gaseous footstep bearing of dynamic pressure, include elastic support mechanism and bearing frame, elastic support mechanism through the draw-in groove with the bearing frame is connected.

Optionally, the elastic support mechanism is fixedly connected with the slot through a positioning element.

Optionally, the securing means includes pin locating and stick welding.

3. Advantageous effects

Compared with the prior art, the application provides an elastic support mechanism and gaseous footstep bearing's of dynamic pressure beneficial effect lies in:

the application provides an elastic support mechanism, through elastic cylinder foil piece subassembly multilayer structure production multiple adaptability rigidity, enlarge the load range. The elastic supporting mechanism adopts a multi-layer elastic cylinder foil assembly and a flat foil assembly which are combined in a laminated mode, and is similar to a spring structure. When bearing larger load, the bending part becomes small, and the line contact gradually becomes surface contact between the flat foil assemblies, so that the flat foil assemblies can effectively absorb vibration and impact load as a buffer structure. When the main shaft rotates at a high speed, the elastic cylinder foil can provide stable bearing capacity and good friction and deformation damping, and vibration energy is stored to control the stability of the bearing. And the elastic supporting mechanism has certain self-recovery capability after long-time action, is not easy to generate plastic deformation, so that the bearing performance of the bearing has better repeatability and service life, and has stronger and wider application range compared with the traditional bump foil bearing. The multilayer elastic structure has interlayer damping. The damping of the dynamic pressure gas thrust bearing is generated between the bending part and the top foil and the bearing seat, and between the layers of the bending part, so that the damping generation and change range is enlarged, and the bearing capacity and stability are improved. The damping action can make the elastic supporting mechanism only deform radially under the condition of small size change, and the elastic component can deform and slide under the condition of large bearing force so as to make it stably run. The arrangement mode of the bent and rolled parts between single layers and multiple layers is changed, the adjusting range of the supporting rigidity is enlarged, and the distribution of the bearing capacity is effectively improved. The support characteristics of the bearing are locally and integrally adjusted by adjusting the arrangement mode of the bent parts on the single-layer foil assembly, the distribution density support area and the arrangement mode among the layers of the multilayer elastic cylinder foil assembly, so that the adaptability distribution method for different bearings is widened. Further alleviating the problem of heat generation. Due to the existence of the through holes, the multi-layer hollowed flat foil is communicated with each other in space, the winding part increases the winding flow, the circulation and heat dissipation among layers are facilitated, and the gas lubrication characteristic is effectively improved. The structural parameters of the bending part, the superposition arrangement mode of each layer, the material characteristics and other parameters can be changed to further improve the running performance of the dynamic pressure gas bearing. The integration processing is convenient, and the assembly and the replacement are easy.

Drawings

FIG. 1 is a schematic view of a resilient support mechanism of the present application;

FIG. 2 is a schematic view of a first arrangement of the herein disclosed single layer flexible can foil convolutions;

FIG. 3 is a schematic view of a second arrangement of the wrap of the single layer flexible drum foil of the present application;

FIG. 4 is a schematic view of a third arrangement of the wrap of the single layer flexible drum foil of the present application;

FIG. 5 is a schematic view of a fourth arrangement of the wrap of the single layer flexible drum foil of the present application;

FIG. 6 is a schematic view of a fifth arrangement of the presently disclosed single layer flexible drum foil convolutions;

FIG. 7 is a schematic view of a first arrangement of the presently disclosed multi-layer flexible can foil convolutions;

FIG. 8 is a schematic view of a second arrangement of the presently disclosed multi-layer elastomeric sleeve foil convolutions;

FIG. 9 is a schematic view of a hydrodynamic gas thrust bearing configuration of the present application;

FIG. 10 is a schematic illustration of a dynamic gas thrust bearing predeformation of the present application;

in the figure: the rotor comprises 1-flat foil, 2-elastic cylinder foil, 3-elastic cylinder surface, 4-through hole, 5-bending part, 6-first connecting plate, 7-second connecting plate, 8-rotor thrust plate, 9-bearing seat, 10-clamping groove, 11-main shaft and 12-positioning element.

Detailed Description

Hereinafter, specific embodiments of the present application will be described in detail with reference to the accompanying drawings, and it will be apparent to those skilled in the art from this detailed description that the present application can be practiced. Features from different embodiments may be combined to yield new embodiments, or certain features may be substituted for certain embodiments to yield yet further preferred embodiments, without departing from the principles of the present application.

Because of the outstanding advantages of foil dynamical pressure gas bearings, considerable manpower and material resources are invested in many countries to research foil bearings, and the usa, russia and the like all make important progress on the development of foil bearings, and some foil bearings have been applied to high-speed turbomachines. For example, foil bearings for air chillers have been used for over 100 ten thousand hours on U.S. boeing airliners; russian developed foil bearings with a speed of 24 vrn/rain for low temperature helium turboexpanders; foil bearings for turbochargers were developed by the company MiTi, USA with a rotational speed of 12 kr/min and a number of start-stops exceeding 10 kr.

Referring to fig. 1 to 8, the application provides an elastic supporting mechanism, which includes a flat foil assembly and an elastic cylinder foil assembly that are sequentially stacked, wherein the flat foil assembly includes a plurality of flat foils 1, the elastic cylinder foil assembly includes a plurality of elastic cylinder foil assemblies, the elastic cylinder foil assemblies are stacked and arranged, and the elastic cylinder foil assembly includes a plurality of elastic cylinder foils 2;

the elastic cylinder foil 2 comprises an elastic cylinder surface 3, a plurality of through holes 4 are formed in the elastic cylinder surface 3, the through holes 4 are connected with one side of a bending portion 5, and the bending portion 5 is in a convex shape.

Each layer of elastic cylinder foil assembly comprises a plurality of independent bending parts 5 and through holes 4 after bending, and when the load is gradually increased from no load to the load, the bending parts 5 are gradually changed into double-side contact with the upper and lower elastic cylinder foil assemblies from line contact among layers, so that the bearing capacity is uniformly distributed, and the axial stability is improved. Meanwhile, each layer of elastic cylinder foil assembly contains the through holes 4 after being bent and rolled, and the through holes are mutually communicated, so that the heat dissipation is facilitated, and the gas lubrication characteristic is improved.

Furthermore, the other side of the bent part 5 is in contact with the upper layer of elastic cylinder foil 2 or the upper layer of flat foil 1, and the through holes 4 of the elastic cylinder foil groups of each layer are arranged in a staggered mode. That is, there is no overlap between each layer of through holes 4, and the lower layer of curled portion 5 is prevented from being clamped at the upper layer of through holes 4, so that the positions of the elastic supporting points of each layer are staggered.

When the upper layer of the elastic cylinder foil 2 is the flat foil 1, the other side of the bent part 5 is in contact with the flat foil 1, and the rest bent parts 5 are in contact with the upper layer of the elastic cylinder foil 2.

The beads 5 are arranged in the circumferential direction.

The elastic cylinder foil assembly is stacked in multiple layers and ensures that the positions of elastic supporting points, namely the bent parts 5, of the layers are staggered. The convex fixed points of the lower elastic cylinder between the adjacent elastic cylinder foil assemblies are attached to the transition bottom edges of the elastic cylinders of the upper elastic cylinder foil assembly, and the transition bottom edges of the elastic cylinders of the bottom elastic cylinder foil assembly are attached to the surface of the bearing block 9. The elastic support mechanism has a space for bearing lifting, axial deformation and circumferential sliding in the bearing seat 9.

Further, the arrangement mode of the bent and rolled parts 5 comprises radial row, radial fork row, circumferential row or circumferential fork row.

The bending direction of the bending part 5 can be adjusted according to the stress condition, and various arrangement modes can be combined in a staggered mode.

Further, the flat foils 1 are fan-shaped, the number of the flat foils 1 is three or more, and the flat foil assembly is circular; the elastic cylinder foil pieces 2 are fan-shaped, the number of the elastic cylinder foil pieces 2 is six or more than six, the number of the elastic cylinder foil pieces is more than two layers, and the elastic cylinder foil pieces are circular.

Further, the bending part 5 is in a hollow cylinder shape, and the bending part 5 is fixedly connected with the through hole 4.

Further, the through hole 4 is rectangular, and the bent and rolled part 5 is formed by single-turn single-layer or multi-turn layering.

The bending part 5 is a single-circle single-layer or multi-circle layering part, and the elastic range of the element is changed; the damping rigidity can also be adjusted by changing the support area through changing the bending size, the number of elements and the distribution density.

Further, a first connecting plate 6 is arranged on the flat foil 1, the first connecting plate 6 is connected with one end of the surface of the flat foil, and the other end of the surface of the flat foil is free; the elastic cylinder foil 2 is provided with a second connecting plate 7, the second connecting plate 7 is connected with one end of the elastic cylinder surface 3, and the other end of the elastic cylinder surface 3 is free.

The first connecting plate 6 can be fixedly connected with the surface of the flat foil or movably connected with the surface of the flat foil; the second connecting plate 7 can be fixedly connected with the elastic cylinder surface 3 or movably connected with the elastic cylinder surface.

That is, the first connecting plate 6 may be formed by bending the flat foil 1, that is, the first connecting plate 6 may be an extension of the flat foil 1; the second connecting plate 7 may be formed by bending the elastic tube foil 2, and similarly, the second connecting plate 7 is an extension of the elastic tube foil 2.

Fig. 7 shows that the multiple layers of fan-shaped elastic cylinder foil layers are distributed in parallel along the circumference, and fig. 8 shows that the multiple layers of fan-shaped elastic cylinder foil layers are distributed in a staggered manner along the circumference.

Referring to fig. 9 to 10, the present application further provides a dynamic pressure gas thrust bearing, including the elastic support mechanism and the bearing seat 9, the elastic support mechanism is connected with the bearing seat 9 through a clamping groove 10.

Further, the elastic supporting mechanism is fixedly connected with the card slot 10 through a positioning element 12. The rotor thrust plate 8 includes a main shaft 11, and the elastic support mechanism is disposed concentrically with the main shaft 11 so that the elastic support mechanism can rotate around the main shaft 11.

More than three fan-shaped flat foils 1, more than six fan-shaped elastic cylinder foils 2 and more than six fixing screws. The upper end face of the bearing seat 9 is uniformly provided with more than three clamping grooves 10, namely wedge-shaped grooves, along the circumferential direction, and the ratio of the number of the fan-shaped elastic cylinder foils 2, the number of the fan-shaped flat foils 1, the number of the wedge-shaped grooves and the number of the fixing screws is n:1:1:2(n is a positive integer). The circular structure composed of more than three fan-shaped flat foils 1 and the multilayer circular structure composed of more than six fan-shaped elastic cylinder foils 2 are completely superposed with the bearing seat 9, and a central hole for passing through the main shaft 11 is reserved on the inner ring side. The upper end of the bearing seat 9 sequentially passes through the second connecting plate 7 and the first connecting plate 6 by screws from inside to outside, the multi-layer fan-shaped elastic cylinder foil 2 and the fan-shaped flat foil 1 are fixed in the wedge-shaped groove, and the other end of the multi-layer fan-shaped elastic cylinder foil is free.

Further, the fixing mode comprises pin positioning and welding with welding rods.

The fan-shaped elastic cylinder foil 2 and the bearing seat 9 are made of stainless steel, beryllium bronze or nickel-based alloy, the thickness of the foil is 0.1 mm, the height of the bent and rolled part 5 is 0.2 mm, and the heights of the bent and rolled part 5 are equal from the fixed side to the free side. The bottom side of the bearing seat 9 is provided with a positioning hole, the positioning element 12 is a screw, one end of an elastic supporting mechanism consisting of the flat foil assembly and the multilayer elastic cylinder foil assembly is fixed in the wedge-shaped groove through the screw, the extension direction of the elastic element is the same as the rotation direction of the main shaft, and the fixing position can be adjusted according to the rotation direction. The foil may also be fixed by pinning or welding.

The total supporting area of upper-layer elements is changed by changing the number and the distribution density of the shells on the single-layer fan-shaped elastic cylinder foils 2, the rigidity and the damping of the elastic supporting mechanism are adjusted, and the integral load range of the bearing is enlarged; the elastic range is adjusted by changing the thickness of the cylinder shell and the number of layers of the bending coil, and the radial deformation and the circumferential slippage are generated under the damping action, so that the start-stop and running performance of the bearing rotor system is improved; the position of the supporting point of the bending part is changed by adopting different superposition arrangement modes in the axial direction and the radial direction among layers, so that the bearing capacity distribution is changed, the self-excitation vortex motion is reduced, and the stability is improved. The radial arrangement mode can adopt radial in-line or fork row, circumferential in-line or fork row, the axial arrangement mode can adopt parallel distribution, staggered distribution and non-uniform distribution, wherein the winding direction of the elastic cylinder can be changed according to the stress condition. The supporting point positions of the elastic cylinder foils 2 are staggered, the protruding fixed points of the lower elastic cylinder between the adjacent elastic cylinder foils are attached to the transition bottom edge of the elastic cylinder between the upper elastic cylinder foils, and the transition bottom edge of the elastic cylinder between the bottom elastic cylinder foils is attached to the surface of the bearing seat.

The contact mode and damping between the bearings in the working state of the bearing are analyzed as follows with reference to fig. 1:

(1) when the dynamic pressure gas thrust bearing bears no load, the fan-shaped elastic cylinder foil assembly and the fan-shaped flat foil assembly are both in a free state and do not bear pressure and do not extend, the multi-layer fan-shaped elastic cylinder foil assembly and the fan-shaped flat foil assembly are in line contact at the fixed side, and the adjacent fan-shaped elastic cylinder foil 2 is in line contact at the lap joint along the axial direction of the elastic cylinder.

(2) When the dynamic pressure gas thrust bearing bears a small load, only the fan-shaped flat foil 1 extends under the action of the pressure of the air film, the fan-shaped elastic cylinder foil 2 plays a supporting role, at the moment, the fan-shaped elastic cylinder foil 2 and the fan-shaped flat foil 1 are partially in surface contact from the contact of the fixed lateral line, and the adjacent elastic cylinder foil 2 is partially in surface contact at the lap joint part. The thrust bearing has fan-shaped flat foil 1 structure damping and the adjacent fan-shaped elastic cylinder foil 2 has friction damping. As the load is gradually increased, the degree of surface contact between the fan-shaped elastic tube foil 2 and the fan-shaped flat foil 1 and the surface contact between the adjacent fan-shaped elastic tube foils 2 are increased.

(3) When the dynamic pressure gas thrust bearing bears a large load, the pressure of the wedge-shaped gas film enables the fan-shaped flat foil 1 and the multi-layer fan-shaped elastic cylinder foil 2 to extend to play a supporting role together, the bending part 5 is in contact with the top flat foil surface due to extrusion deformation, the multi-layer elastic cylinder foil 2 is increased along with the increase of the bearing capacity, the surface contact is increased, and the supporting role is enhanced. At the moment, the dynamic pressure gas thrust bearing has fan-shaped flat foil 1 structure damping, fan-shaped elastic cylinder foil 2 structure damping, friction damping between the fan-shaped flat foil 1 and the fan-shaped elastic cylinder foil 2 and friction damping between the adjacent fan-shaped elastic cylinder foils 2.

(4) When the dynamic pressure gas thrust bearing bears radial load or evenly distributes load, the top layer flat foil 1 generates arch height change and circumferential sliding to transfer the load to the lower layer multilayer elastic cylinder foil 2, two ends of the bending part 5 are in arc surface contact with the foils, the bearing capacity can be redistributed and evenly transferred to the inner side of the bearing seat 9, adaptive rigidity and damping are generated to adapt to a wider load range, unstable vortex is consumed in time to achieve the effect of vibration reduction, self-excitation vortex and low-frequency vortex of a bearing rotor are effectively inhibited, and the stability of rotor operation is improved. At the moment, the dynamic pressure gas thrust bearing has fan-shaped flat foil 1 structure damping, fan-shaped elastic cylinder foil 2 structure damping, friction damping between the fan-shaped flat foil 1 and the fan-shaped elastic cylinder foil 2 and friction damping between the adjacent fan-shaped elastic cylinder foils 2.

Influence of changing parameters: the elastic supporting mechanism formed by the top layer foil 1 and the multilayer elastic cylinder foil 2 has a space for bearing lifting, axial deformation and circumferential sliding in the bearing seat 9, and has good static and dynamic characteristics and stability. Mainly depends on the structural change, the reorganization arrangement and the cooperation with the flat foil 1 of the multilayer elastic cylinder foil 2.

(1) The rigidity and the damping of the bearing are adjusted by changing the single-layer axial arrangement mode and the interlayer arrangement mode. The shell type bulges with different densities are arranged on the single layer, if radial row or fork row, circumferential row or fork row and the like are adopted, as shown in figures 2-6, the bearing capacity is more balanced from middle to outside due to circumferential arrangement, and the deformation of the foil is more influenced than the radial arrangement. The multilayer is provided with different superposition arrangement modes, but the positions of the elastic supporting points of each layer are ensured to be staggered. The bending direction of the bending part 5 can be adjusted to be combined in a staggered mode, the supporting point position of the bending part 5 is changed, the integral rigidity and the elastic variation of the foil bearing are improved, and the damping characteristic is improved.

(2) The bearing support characteristics are adjusted locally and integrally by properly increasing and decreasing the number, density and crimp thickness of the crimped portions. Referring to fig. 7 and 8, the more uniform the axial bearing force of the bending portion, the larger the range of the axial load that can be borne, the larger the lamination thickness, the more the number of layers of the curls, the larger the damping effect, and the larger the adjustment range of the adaptive stiffness. It should be noted that, as the number of the bent portions 5 increases, the increase of the inter-foil friction effect causes the bent portions 5 near the fixed end to be difficult to deform and have increased rigidity under the same load, so that the phenomenon of deadlocking between layers is likely to occur, coulomb damping cannot be provided, and the stability of the system is adversely affected, and therefore, it is important to set the number appropriately.

(3) The pre-tightening force of the bearings and the main shaft during installation is changed by increasing or decreasing the number of the elastic cylinder foils 2 in a stacked manner, so that the lower take-off speed is adapted, and the starting, stopping and running performances of a bearing rotor system are improved; the multilayer structure provides a larger deformation and heat dissipation space for the foil, widens the adaptive rigidity and damping, reduces the friction loss, and is favorable for realizing the efficient and stable operation of high-speed rotating machinery.

The processing method and the combination mode are as follows: the elastic cylinder foil 2 is simple in structure and convenient to integrally process. When the bump foil and the bubbling element are processed, the impact force on the foil needs to be controlled, the element is prevented from being damaged by overlarge stress, and the processing precision requirement is high. The elastic cylinder foil can be formed by one-time impact, and the curled part of the elastic cylinder, namely the curled part 5 is separated from the foil, so that the elastic cylinder foil penetrates through the foil and is more beneficial to processing. The cylindrical shell-shaped bulge on the elastic cylinder foil 2 is formed by directly bending and rolling part of the foil by a file or a laser cutting bending machine, and the rest hollow bottom foil is connected with the bending part 5 to play the roles of fixing the elastic cylinder, homogenizing the bearing capacity and penetrating and dissipating heat. In order to prevent dry friction and friction damage between the rotor and the thrust bearing when the engine is started or stopped because the air film is not formed, a coating can be added on the surface of the flat foil to achieve the lubricating effect.

The fixing method comprises the following steps: the foils are arranged in a segmented and separated mode, and self-centering performance and pre-tightening force during assembly of the bearing are improved. In order to better fix the elastic supporting mechanism on the bearing seat 9 and generate an air gap to ensure that the bearing rotates at a high speed, each layer of elastic supporting mechanism is divided into at least three fan-shaped parts which are uniformly distributed in the circumferential direction, a wedge-shaped groove is processed at the separation part of the upper end surface of the bearing seat 9, one end of a fan-shaped elastic cylinder foil 2 is fixed in the groove by a screw, the other end of the fan-shaped elastic cylinder foil is arranged along the rotation direction of the shaft and is not fixed, and unstable vortex motion of. Meanwhile, the fan-shaped elastic cylinder foil 2 can be processed into strips and sequentially fixed in the wedge-shaped groove in a segmented manner, so that the centering of the rotor and the twisting deformation of the thrust disc can be better adapted. The multi-stage pressure-bearing dynamic pressure gas thrust bearing is generally fixed by screws, and the extension and sliding directions of the elastic element are the same as the rotating direction of the main shaft 11. The position of the screw is determined according to the rotation direction of the main shaft 11, and is conveniently adjusted when the rotation direction is changed. However, the fixing method is not limited to this, and the method of positioning pins, welding with welding rods, and the like may be used.

The application provides an elastic support mechanism, through elastic cylinder foil piece subassembly multilayer structure production multiple adaptability rigidity, enlarge the load range. The elastic supporting mechanism adopts a multi-layer elastic cylinder foil assembly and a flat foil assembly which are combined in a laminated mode, and is similar to a spring structure. When bearing larger load, the bending part becomes small, and the line contact gradually becomes surface contact between the flat foil assemblies, so that the flat foil assemblies can effectively absorb vibration and impact load as a buffer structure. The elastic cylinder foil 2 can provide stable bearing capacity and good friction and deformation damping when the main shaft 11 rotates at a high speed, and vibration energy is stored to control the stability of the bearing. And the elastic supporting mechanism has certain self-recovery capability after long-time action, is not easy to generate plastic deformation, so that the bearing performance of the bearing has better repeatability and service life, and has stronger and wider application range compared with the traditional bump foil bearing. The multilayer elastic structure has interlayer damping. The damping of the dynamic pressure gas thrust bearing is generated between the bent part 5 and the top foil and the bearing seat 9, and also generated between the layers of the bent part 5, so that the damping generation and change range is enlarged, and the bearing capacity and stability of the bearing are improved. The damping action can make the elastic supporting mechanism only deform radially under the condition of small size change, and the elastic component can deform and slide under the condition of large bearing force so as to make it stably run. The arrangement mode of the bent and rolled parts 5 between single layer and multiple layers is changed, the adjusting range of the supporting rigidity is enlarged, and the distribution of the bearing capacity is effectively improved. The support characteristics of the bearing are locally and integrally adjusted by adjusting the arrangement mode of the bent parts 5 on the single-layer foil assembly, the distribution density support area and the arrangement mode among the layers of the multi-layer elastic cylinder foil assembly, so that the adaptability distribution method for different bearings is widened. Further alleviating the problem of heat generation. Due to the existence of the through holes, the multi-layer hollow flat foil is communicated with each other in space, the winding part 5 increases the streaming, the circulation and the heat dissipation among layers are easy, and the gas lubrication characteristic is effectively improved. The structural parameters of the bending part 5, the superposition arrangement mode of each layer, the material characteristics and other parameters can be changed to further improve the running performance of the dynamic pressure gas bearing. The integration processing is convenient, and the assembly and the replacement are easy.

Although the present application has been described above with reference to specific embodiments, those skilled in the art will recognize that many changes may be made in the configuration and details of the present application within the principles and scope of the present application. The scope of protection of the application is determined by the appended claims, and all changes that come within the meaning and range of equivalency of the technical features are intended to be embraced therein.

Claims (10)

1. An elastic support mechanism, its characterized in that: the device comprises a flat foil assembly and an elastic cylinder foil assembly which are sequentially stacked, wherein the flat foil assembly comprises a plurality of flat foils (1), the elastic cylinder foil assembly comprises a plurality of elastic cylinder foil assemblies, the elastic cylinder foil assemblies are stacked and arranged, and the elastic cylinder foil assembly comprises a plurality of elastic cylinder foils (2);

the elastic cylinder foil (2) comprises an elastic cylinder surface (3), a plurality of through holes (4) are formed in the elastic cylinder surface (3), the through holes (4) are connected with one side of the bent and rolled portion (5), and the bent and rolled portion (5) is in a convex shape.

2. The resilient support mechanism of claim 1, wherein: the other side of the bending part (5) is contacted with the upper layer of elastic cylinder foil sheet (2) or the flat foil (1), and the through holes (4) of the elastic cylinder foil sheet groups of each layer are arranged in a staggered mode.

3. The resilient support mechanism of claim 1, wherein: the arrangement mode of the bent and rolled parts (5) comprises radial row, radial fork row, circumferential row or circumferential fork row.

4. The resilient support mechanism of claim 1, wherein: the flat foils (1) are fan-shaped, the number of the flat foils (1) is three or more, and the cross section of the flat foil assembly is circular; the elastic cylinder foil assembly is characterized in that the elastic cylinder foil (2) is fan-shaped, the number of the elastic cylinder foils (2) is six or more than six, the number of the elastic cylinder foil assemblies is more than two layers, and the cross section of each elastic cylinder foil assembly is circular.

5. The elastic support mechanism according to any one of claims 1 to 4, wherein: the bending part (5) is of a hollow cylinder shape, and the bending part (5) is fixedly connected with the through hole (4).

6. The resilient support mechanism of claim 5, wherein: the through hole (4) is rectangular, and the bent and rolled part (5) is single-circle single-layer or multi-circle layered.

7. The resilient support mechanism of claim 6, wherein: the flat foil (1) is provided with a first connecting plate (6), the first connecting plate (6) is connected with one end of the surface of the flat foil, and the other end of the surface of the flat foil is free; the elastic cylinder foil (2) is provided with a second connecting plate (7), the second connecting plate (7) is connected with one end of the elastic cylinder surface (3), and the other end of the elastic cylinder surface (3) is free.

8. A dynamic pressure gas thrust bearing, characterized by: comprising the elastic supporting mechanism of any one of claims 1 to 7 and a bearing seat (9), wherein the elastic supporting mechanism is connected with the bearing seat (9) through a clamping groove (10).

9. The thrust gas dynamic pressure bearing according to claim 8, wherein: the elastic supporting mechanism is fixedly connected with the clamping groove (10) through a positioning element (12).

10. The aerodynamic gas thrust bearing of claim 9, wherein: the fixed connection comprises pin positioning and welding rod welding.

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