Aerodynamic radial bearing based on tenon biological structure

Abstract

The utility model discloses a gas dynamic pressure radial bearing based on a tenon biological structure, and relates to the technical field of radial dynamic pressure gas bearings. Comprising a bearing rotor and a bearing sleeve, grooves are formed in the peripheral surface of the bearing rotor, the grooves are distributed in the cylindrical spiral line direction, the grooves are distributed in the circumferential direction of the bearing rotor at intervals to form a groove set, a zone area is formed between any two adjacent grooves, the section of the zone area is in a streamline shape, and the bearing rotor is arranged in the bearing sleeve. And in a non-working state, the table area is in contact with the inner wall of the bearing sleeve, and in a working state, gas outside the bearing can flow into the bearing sleeve from the gap, and a gas film with high internal pressure is formed in the middle of the bearing sleeve. According to the aerodynamic radial bearing based on the tenon biological structure, the bearing capacity of the bearing is enhanced, the stability of the bearing is improved, the friction loss in the bearing is reduced, the service life of the bearing is prolonged, and the stability of the bearing is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of radial dynamic pressure gas bearings, and more specifically to a gas dynamic pressure radial bearing based on the biological structure of a peregrine falcon. Background Art

[0002] At present, air compressors are an important component of automotive hydrogen fuel cells. Centrifugal air compressors have broad application prospects due to their high pressure ratio, small size, oil-free, high power, compact structure, etc. Air compressors suitable for hydrogen fuel cells have high power and high rotor speed, and they also need to meet oil-free working conditions. Spiral groove gas bearings can well meet the needs of higher speed and higher precision of impeller rotor machinery.

[0003] The peregrine falcon is the fastest bird in the world. When it flies normally in the air, its speed is only 100 kilometers. But when it dives and glides, its wings are not fully extended, but remain in a special position. At this time, the special contour shape formed by the wings and the body will minimize the air resistance and convert the gravitational potential energy into kinetic energy to the greatest extent, with a speed of up to 389 kilometers per hour.

[0004] For spiral groove gas bearings, the spiral groove is the core part of the bearing. Parameters such as groove length, groove depth, groove width, helix angle, and number of grooves have an important influence on the bearing's load-bearing capacity and stability. Conventional optimization of spiral groove gas bearings is to change the parameters of its grooves so that its performance meets the needs of work, but the shape of the cross section of the stage area is often ignored. The cross-sectional shape of the groove will affect the flow characteristics of the gas, and then affect the properties of the high-pressure gas film when the bearing is working, changing the bearing's load-bearing capacity and stability.

[0005] Therefore, how to develop a gas hydrodynamic radial bearing based on the biological structure of the peregrine falcon and improve the existing bearings according to the principles of bionics to make them have higher load-bearing capacity and better stability has become a technical problem that needs to be urgently solved by technical personnel in this field. Utility Model Content

[0006] In view of this, the utility model provides a gas dynamic pressure radial bearing based on the biological structure of the peregrine falcon, which strengthens the bearing's load-bearing capacity and improves the bearing's stability. In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a gas dynamic pressure radial bearing based on the biological structure of a peregrine falcon, comprising:

[0008] A bearing rotor, wherein grooves are arranged on the outer circumferential surface of the bearing rotor, the grooves are distributed along a cylindrical spiral line, a plurality of the grooves are distributed at intervals along the circumference of the bearing rotor to form a groove group, and a terrace is formed between any two adjacent grooves, and the cross section of the terrace is streamlined;

[0009] A bearing sleeve, wherein the bearing rotor is arranged inside the bearing sleeve;

[0010] In the non-working state, the platform area contacts the inner wall of the bearing sleeve.

[0011] Under working conditions, the gas outside the bearing will flow in from the gap and form a gas film with high internal pressure in the middle of the bearing sleeve.

[0012] Furthermore, the groove group is designed to be V-shaped, the V-shaped groove covers the entire outer circumference of the bearing rotor and the plurality of grooves are evenly distributed around the circumference.

[0013] Furthermore, the groove group is designed to be in an eight-shaped shape, the grooves in the eight-shaped shape are arranged to be symmetrically distributed on the left and right and a plurality of grooves are evenly distributed around the circumference, the center of the groove in the eight-shaped shape is a spacing surface, and the spacing surface is a smooth annular surface.

[0014] Furthermore, the platform includes a front edge, a rear edge and an upper surface, and the slope of the front edge is greater than the slope of the rear edge.

[0015] Furthermore, the cross-sectional shape of the platform is similar to the outline of the wings of a peregrine falcon when it is gliding, and a univariate quintic function is selected to fit:

[0016] y=-3.0947 -7 x 5 -2.8808 -5 x 4 +0.0029x 3 -0.0883x 2 +0.9947x+0.2161.

[0017] Furthermore, a wear-resistant coating is added to the surface of the platform area.

[0018] It can be seen from the above technical solution that compared with the prior art, the utility model discloses a gas dynamic pressure radial bearing based on the biological structure of the peregrine falcon, which converts more kinetic energy of the gas when flowing through the bearing table area into pressure energy, increases the air pressure of the air film, and improves the stiffness and load-bearing capacity of the bearing; reduces the friction loss inside the bearing, reduces the heat generated by the bearing, and avoids the impact of local turbulence caused by internal friction of the bearing, thereby improving the stability of the bearing; speeds up the gas flow rate inside the bearing, the speed at which the external gas flows into the bearing, and the speed at which the air film pressure increases, reduces the wear time of the bearing rotor and the sleeve, and improves the life and stability of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a gas dynamic pressure radial bearing based on the biological structure of a peregrine falcon provided by the utility model;

[0021] Figure 2 A front view of a gas dynamic pressure radial bearing based on the peregrine falcon biological structure provided by the utility model;

[0022] Figure 3 A schematic diagram of the structure of the bearing rotor provided by the utility model;

[0023] Figure 4 A schematic diagram of the structure of the bearing sleeve provided by the utility model;

[0024] Figure 5 A schematic diagram of the structure of the station area provided by the utility model;

[0025] Figure 6 Another structural schematic diagram of the gas dynamic pressure radial bearing based on the peregrine falcon biological structure provided by the utility model;

[0026] Figure 7 Another front view of the gas dynamic pressure radial bearing based on the peregrine falcon biological structure provided by the utility model;

[0027] Figure 8 This is a structural schematic diagram of the spacing surface provided by the utility model.

[0028] In the figure: 1, bearing rotor; 2, bearing sleeve; 3, front edge; 4, upper surface; 5, rear edge; 6, spacing surface; 7, platform area; 8, groove. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] See also Figure 1-8 The utility model embodiment discloses a gas dynamic pressure radial bearing based on the biological structure of the peregrine falcon, comprising:

[0031] The bearing rotor 1 is provided with grooves 8 on the outer circumferential surface thereof, the grooves 8 are distributed along the cylindrical spiral line, a plurality of grooves 8 are distributed at intervals along the circumference of the bearing rotor 1 to form a groove group, and a platform 7 is formed between any two adjacent grooves 8, and the cross section of the platform 7 is streamlined;

[0032] A bearing sleeve 2, wherein the bearing rotor 1 is arranged inside the bearing sleeve 2;

[0033] In the non-working state, the platform 7 is in contact with the inner wall of the bearing sleeve 2.

[0034] In the working state, the gas outside the bearing will flow in from the gap and form a gas film with high internal pressure in the middle of the bearing sleeve 2.

[0035] During operation, the groove 8 will rotate with the bearing rotor 1, generating a speed difference with the surrounding gas. In the process of the gas between the bearing rotor 1 and the bearing sleeve 2 moving from the groove 8 to the stage 7, the space where the gas is located will be compressed, and the gas pressure in the stage 7 will increase, generating buoyancy, and the gas pressure in the groove 8 will decrease. The gas outside the bearing will flow into the groove 8, and enter the stage 7 and be compressed as the groove 8 rotates, until a dynamic balance is reached.

[0036] When the groove 8 rotates with the bearing rotor 1, the gas will not only be compressed from the groove 8 to the land area 7, but also be compressed from the two ends of the bearing rotor 1 to the middle along the spiral direction, thereby forming an air film with higher internal pressure in the middle of the bearing rotor 1, thereby improving the bearing capacity of the bearing.

[0037] like Figure 1-5 As shown, in the specific embodiment 1, the groove group is designed to be V-shaped, the V-shaped groove 8 covers the entire outer circumference of the bearing rotor 1 and the plurality of grooves 8 are evenly distributed around the circumference.

[0038] During the operation of the bearing, the gas in the grooves 8 on both sides is compressed toward the middle and converges in the middle. As the gas at both ends of the bearing flows toward the middle, the gas at both ends of the bearing decreases, causing the gas outside the bearing to enter the bearing, and eventually reaching a dynamic balance, thereby forming an annular area with higher pressure, further improving the bearing capacity of the bearing. In addition, since the grooves 8 at both ends of the bearing rotor 1 are connected, when the air pressure in the groove 8 on one side is too high, the gas on the other side will balance it, allowing the bearing to maintain a stable operating state, avoiding the bearing being affected by the rotational torque due to the different pressures at both ends, and improving the stability of the bearing.

[0039] like Figure 5-8 As shown, in the specific embodiment 2, the groove group is designed to be in an eight-shaped shape, the eight-shaped grooves 8 are arranged to be symmetrically distributed on the left and right, and the multiple grooves 8 are evenly distributed around the circumference, the center of the eight-shaped groove 8 is the spacing surface 6, and the spacing surface 6 is a smooth annular surface.

[0040] When the gas rotates with the bearing rotor 1, it will flow from the two ends of the groove 8 to the middle and be compressed. However, since the grooves 8 at both ends are not connected, the gas will stop flowing near the spacing surface 6. At this time, the gas gathers at the end of the groove, increasing the pressure at the end of the groove 8, and finally forming a higher pressure annular gas film at both ends of the spacing surface of the bearing rotor 1, greatly improving the bearing capacity.

[0041] In some embodiments, the platform 7 includes a front edge 3, a rear edge 5 and an upper surface 4. The slope of the front edge 3 is greater than the slope of the rear edge 5. The cross-sectional shape of the platform 7 is similar to the profile of the wings of a peregrine falcon when gliding. The cross-sectional profile of the platform in a plane rectangular coordinate system is fitted by a univariate quintic function as follows:

[0042] y=-3.0947 -7 x 5 -2.8808 -5 x 4 +0.0029x 3 -0.0883x 2 +0.9947x+0.2161.

[0043] x represents the horizontal coordinate of each point on the cross-sectional profile of the stage area, and y represents the vertical coordinate of each point on the cross-sectional profile of the stage area.

[0044] When the bearing is working, the airflow flows on the upper surface 4 of the platform 7, reducing the resistance of the gas during the flow. Since the front edge 3 is steeper, the local airflow in the bearing will be decelerated, converting more kinetic energy of the gas into pressure energy, increasing the air film pressure of the platform 7, and the rear edge 5 is gentler to guide the air flow, further improving the bearing's load-bearing capacity.

[0045] When the bearing is working, the flow resistance of the gas inside the groove 8 is reduced, and the gas outside the bearing flows into the groove 8 faster, which speeds up the increase of the gas film pressure. The land area 7 reduces the heat generated by the internal friction of the bearing, avoids local turbulence inside the bearing, improves the stability of the bearing, increases the gas inside the bearing, and increases the gas film pressure and the bearing capacity of the bearing.

[0046] In some embodiments, a wear-resistant coating is added to the surface of the land area 7 .

[0047] The friction and wear between the bearing rotor 1 and the bearing sleeve 2 are reduced at the initial start-up of the bearing, thereby increasing the service life of the bearing.

[0048] In some embodiments, the number of grooves is set to 20.

[0049] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0050] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas dynamic pressure radial bearing based on the biological structure of the peregrine falcon, characterized in that: include: A bearing rotor, wherein grooves are arranged on the outer circumferential surface of the bearing rotor, the grooves are distributed along a cylindrical spiral line, a plurality of the grooves are distributed at intervals along the circumference of the bearing rotor to form a groove group, and a terrace is formed between any two adjacent grooves, and the cross section of the terrace is streamlined; A bearing sleeve, wherein the bearing rotor is arranged inside the bearing sleeve; In a non-working state, the platform area is in contact with the inner wall of the bearing sleeve; Under working conditions, the gas outside the bearing will flow in from the gap and form a gas film with high internal pressure in the middle of the bearing sleeve.

2. The gas dynamic pressure radial bearing based on the peregrine falcon biological structure according to claim 1, characterized in that: The groove group is designed to be V-shaped, the V-shaped groove covers the entire outer circumference of the bearing rotor and a plurality of grooves are evenly distributed around the circumference.

3. The gas dynamic pressure radial bearing based on the peregrine falcon biological structure according to claim 1, characterized in that: The groove group is designed to be in an eight-shaped shape, the grooves in the eight-shaped shape are arranged to be symmetrically distributed on the left and right, and a plurality of grooves are evenly distributed on the circumference, the center of the groove in the eight-shaped shape is a spacing surface, and the spacing surface is a smooth annular surface.

4. The gas dynamic pressure radial bearing based on the peregrine falcon biological structure according to claim 2 or 3, characterized in that: The stage area includes a front edge, a rear edge and an upper surface, and the slope of the front edge is greater than the slope of the rear edge.

5. The gas dynamic pressure radial bearing based on the peregrine falcon biological structure according to claim 4, characterized in that: The cross-sectional shape of the platform is similar to the outline of the wings of a peregrine falcon when it is gliding, and a univariate quintic function is selected to fit it as: y=-3.0947 -7 x 5 -2.8808 -5 x 4 +0.0029x 3 -0.0883x 2 +0.9947x+0.2161。 6. The gas dynamic pressure radial bearing based on the peregrine falcon biological structure according to claim 5, characterized in that: A wear-resistant coating is added to the surface of the platform area.

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