Novel high-damping foil aerodynamic bearing

Abstract

The novel high-damping foil aerodynamic bearing with the negative Poisson's ratio effect is mainly characterized in that a 3-D double-V-shaped honeycomb supporting structure serves as a flexible supporting unit and is integrally formed through 3D printing, and damping material silica gel is poured into the bearing. In the operation process, a high-pressure gas film generated by a wedge-shaped space formed by matching of the rotor rotating at a high speed and the top foil can cause deformation of the 3-D double-V-shaped honeycomb supporting structure in the radial direction, and the negative Poisson's ratio effect is stimulated. At the moment, coulomb friction is generated between the supporting structure and the top foil and between the supporting structure and the bearing sleeve, meanwhile, shrinkage deformation of the supporting structure is limited by damping material silica gel poured in the supporting structure, and internal friction is generated in the damping material silica gel to consume energy. Therefore, coupling of the 3-D double-V-shaped honeycomb supporting structure and the damping material silica gel can provide proper rigidity and high damping capacity for the foil aerodynamic bearing.

Description

Technical Field

[0001] The present invention belongs to foil gas dynamic pressure bearings, and specifically relates to a novel high damping foil gas dynamic pressure bearing based on negative Poisson's ratio effect and coupled damping material silicone, which enables the novel bearing to simultaneously achieve greater stiffness and damping. Background Art

[0002] The ripple foil type gas dynamic pressure bearing uses ambient gas as the lubricating medium. Compared with traditional oil-containing bearings and rolling bearings, the ripple foil type gas dynamic pressure bearing has the following advantages when operating under light load conditions: high speed, simple structure, almost no friction, low noise, excellent reliability, oil-free environment and very low heat generation. At the same time, because the foil dynamic pressure bearing uses gas as the lubricating medium, it can avoid the lubrication failure characteristics of lubricating oil under high or low temperature conditions, so the foil gas dynamic pressure bearing has the ability to work in a wide temperature range. In summary, the rotor system supported by the dynamic pressure foil bearing has the advantages of ultra-high speed, high efficiency, long life, maintenance-free, strong environmental adaptability, etc., and is widely used in modern high-speed rotating machinery.

[0003] Compared with oil-lubricated bearings, foil gas dynamic pressure bearings have many advantages as mentioned above, but foil gas dynamic pressure bearings still have some problems that need to be solved. The most important problem is that for traditional wave foil type foil gas dynamic pressure bearings, the damping characteristics come from the column friction between the wave foil and the top foil. Due to the low viscosity compressible gas lubrication and flexible support structure, the damping characteristics of the foil gas dynamic pressure bearing are relatively weak, which makes it difficult to fully dissipate the energy of the mechanical vibration of the bearing-rotor system, which limits the application breadth and future development of foil gas dynamic pressure bearings. Therefore, it is very important to improve the damping performance of foil gas dynamic pressure bearings.

[0004] In view of the shortcoming that traditional gas foil bearings have poor damping, the present invention proposes a new type of high damping foil gas dynamic pressure bearing with a negative Poisson's ratio structure. The new bearing support structure is a 3D double V-shaped honeycomb structure with negative Poisson's ratio characteristics, and interacts with the damping material silicone cast inside the bearing. Due to the negative Poisson's ratio effect, the 3D double V-shaped honeycomb structure will shrink inward and generate internal friction when subjected to radial pressure. At this time, the damping material silicone is squeezed and the internal friction is aggravated. Therefore, the 3D double V-shaped honeycomb structure and the damping material silicone inside it together provide high damping characteristics for the foil gas dynamic pressure bearing. Not only that, the new bearing can also achieve the function of controllable overall damping performance of the bearing by adjusting the installation position and quantity of the 3D double V-shaped honeycomb structure. Summary of the invention

[0005] In order to overcome the problems of poor damping performance and unadjustable damping characteristics of conventional foil gas dynamic pressure bearings, the present invention proposes a novel high damping foil gas dynamic pressure bearing based on negative Poisson's ratio effect coupled damping material silicone.

[0006] The technical solution of the present invention is as follows:

[0007] The high damping foil gas dynamic pressure bearing of the present invention is composed of three main components: an integral negative Poisson's ratio support structure, a damping material silica gel and a top foil.

[0008] Furthermore, the integral negative Poisson's ratio support structure is composed of four 3-D double V-shaped honeycomb support structures, which are integrally manufactured using 3D printing technology. The integral negative Poisson's ratio support structure can provide suitable stiffness for the new high damping foil gas dynamic pressure bearing.

[0009] Furthermore, the 3-D double V-shaped honeycomb support structure (9) with negative Poisson's quotient property serves as an elastic support unit of the foil gas dynamic pressure bearing, wherein the form of each double V-shaped structure is designed to be the same.

[0010] Furthermore, the integral negative Poisson's ratio support structure is positioned in the circumferential direction through a specially designed sector-shaped area inside the bearing sleeve.

[0011] Furthermore, the damping material silicone is cast in the entire inner area of ​​the bearing, filling the gaps of the integral negative Poisson's ratio support structure and interacting with the 3-D double V-shaped honeycomb support structure. Due to the negative Poisson's ratio characteristics, the interaction between the integral negative Poisson's ratio support structure and the damping material silicone can provide the bearing with higher damping performance.

[0012] Furthermore, the end covers at both ends and the internal gasket provide axial support and positioning to prevent the integral negative Poisson's ratio support structure from axial movement.

[0013] Furthermore, the top foil is supported by three integral negative Poisson's ratio support structures and fixed in a specific groove in the bearing sleeve through pins. The top foil can also be fixed in a variety of other ways.

[0014] Furthermore, the integral negative Poisson's ratio support structure does not fill the entire circumferential angle, leaving a certain gap for easy bearing installation.

[0015] Furthermore, the end cover is connected to the bearing sleeve by bolts.

[0016] The integral negative Poisson's ratio support structure composed of a 3-D double V-shaped honeycomb support structure used in the present invention can provide suitable stiffness for a new type of high damping foil gas dynamic pressure bearing. Due to the negative Poisson's ratio characteristics, the 3-D double V-shaped honeycomb support structure and the damping material silicone can provide a higher damping performance for the bearing, solving the problem that the damping performance of the traditional air bearing is poor and the damping characteristics cannot be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall appearance of the present invention.

[0018] Figure 2 This is a schematic diagram of the overall internal structure of the present invention, with only the end cover (7) and bolts (8) removed.

[0019] Figure 3 It is an exploded view of the present invention.

[0020] Figure 4 It is the front view of the present invention.

[0021] Figure 5 It is a schematic diagram of the integral negative Poisson's ratio support structure (whole circumference) of the present invention.

[0022] Figure 6 This is a schematic diagram of the structure of the top foil (3) of the present invention.

[0023] Figure 7 This is a schematic diagram of the structure of the bearing sleeve (6) of the present invention.

[0024] Figure 8 This is a schematic diagram of the structure of the pin (4) of the present invention.

[0025] Fig. 9 This is a schematic diagram of the structure of the gasket (6) of the present invention.

[0026] Fig.10 This is the front view of the end cover (7) of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings. However, it should be understood that the following specific embodiments are only preferred embodiments of the present invention and should not be construed as limiting the present invention.

[0028] like Figure 1 and Fig.10 As shown, the end cover (7) and the bearing sleeve (6) are connected using bolts (8).

[0029] like Figure 2 and Figure 3As shown, (1) is an integral negative Poisson's ratio support structure, (2) is a damping material silicone, (3) is a top foil, (4) is a pin, (5) is an internal gasket, (6) is a specially customized bearing sleeve, (7) is an end cover, and (8) is a bolt. Among them, the damping material silicone (2) is poured inside the entire bearing and fills the entire gap of the 3-D double V-shaped honeycomb support structure (9).

[0030] like Figure 4 As shown, the integral negative Poisson's ratio support structure (1) is designed to be three in the circumferential direction and three rows in the axial direction.

[0031] like Figure 5 As shown, the integral negative Poisson's ratio support structure (1) is composed of four 3-D double V-shaped honeycomb support structures (9) and is manufactured in one piece using 3D printing technology.

[0032] like Figure 6 , Figure 7 , Figure 8 As shown, the top foil (3) is a thin-walled non-closed annular structure, which needs to be folded outward to match the groove of the bearing sleeve (6) and fixed by a pin (4), which is cylindrical. The inner wall of the top foil (3) needs to be coated with a wear-resistant coating. The bearing sleeve (6) has a boss seat, which not only provides fixation for the top foil (3) and the pin (4), but also plays a positioning function for the integral negative Poisson's ratio support structure (1).

[0033] The present invention is not limited to the above-mentioned implementation modes. The above-mentioned specific embodiments are intended to better illustrate the basic principles of the present invention. They are merely illustrative and instructive, and not restrictive. The present invention may also have various changes and improvements, such as changing to two radial rows, changing the number of negative Poisson's ratio circular support structures, and changing the size of the structure. Under the guidance of this specification and without departing from the scope of protection of the claims of the present invention, technical personnel in this field may also make various forms of products, all of which are protected by the present invention.

Claims

1. A novel high damping foil gas dynamic pressure bearing, characterized in that: The high damping foil gas dynamic pressure bearing includes an integral negative Poisson's ratio support structure (1), a damping material silicone (2), a top foil (3), a pin (4), an internal gasket (5), a specially customized bearing sleeve (6), an end cover (7) and a bolt (8). The integral negative Poisson's ratio support structure (1) is composed of four 3-D double V-shaped honeycomb support structures (9) and is manufactured in one piece using 3D printing technology. A 3-D double V-shaped honeycomb support structure (9) with negative Poisson's ratio characteristics serves as an elastic support unit of a foil gas dynamic pressure bearing, wherein each double V-shaped structure is designed to be identical, and a damping material silicone (2) is poured to fill the interior of the bearing. Due to the negative Poisson's ratio characteristics, the integral negative Poisson's ratio support structure (1) and the damping material silicone (2) can both provide the bearing with higher damping performance.

2. According to claim 1, it is characterized in that: The damping material silicone (2) is cast inside the entire bearing where the integral negative Poisson's ratio support structure (1) is located, filling the gaps of the integral negative Poisson's ratio support structure (1) and interacting with the 3-D double V-shaped honeycomb support structure (9). The damping material silicone (2) can also be replaced by other damping materials.

3. According to claim 1, it is characterized in that: The end cover (7) and the internal gasket (5) provide axial support and positioning. In order to prevent the integral negative Poisson's ratio support structure (1) from axial movement, the integral negative Poisson's ratio support structure (1) can also be axially positioned in a variety of other ways.

4. According to claim 1, it is characterized in that: The integral negative Poisson's ratio support structure (1) is positioned in the circumferential direction through a specially designed sector-shaped area inside the bearing sleeve (6). The integral negative Poisson's ratio support structure (1) can also be positioned in the circumferential direction through a variety of other methods.

5. According to claim 1, it is characterized in that: The end cover (7) and the bearing sleeve (6) are connected by bolts, and can also be fixed by other various methods.

6. According to claim 1, it is characterized in that: The top foil (3) is supported by 9 integral negative Poisson's ratio support structures (1) and pinned (4) Fitting, fixed in a specific groove in the bearing sleeve (6), the top foil can also be fixed in a variety of other ways.

7. According to claim 1, it is characterized in that: The integral negative Poisson's ratio support structure (1) does not fill the entire circumferential angle, leaving a certain gap to facilitate the installation of the bearing.

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