A type of foil dynamic gas thrust bearing with broken walls and raised surfaces

Abstract

This application discloses a foil-type dynamic pressure gas thrust bearing with broken-wall protrusions, comprising a bearing housing, an elastic foil, and a flat foil; the upper end face of the bearing housing is provided with the elastic foil, and the upper end face of the elastic foil is provided with the flat foil; the elastic foil is provided with broken-wall protrusions. The advantages of this invention are mainly reflected in its simple structure and convenient manufacturing. The elastic foil with broken-wall protrusions is formed by a single stamping process; the broken-wall protrusions are evenly arranged circumferentially, radially, or staggered on the elastic foil, giving the bearing greater load-bearing capacity and better load uniformity; by changing the size, shape, opening direction, and arrangement of the broken-wall protrusions, the load-bearing capacity and stiffness of the bearing can be adjusted to further meet the usage requirements under different conditions.

Description

Technical Field

[0001] This invention belongs to the technical field of dynamic pressure gas bearings in high-speed rotating machinery, and particularly relates to a foil dynamic pressure gas thrust bearing with a broken wall protrusion type. Background Art

[0002] Bearings, used to support rotor systems, are key components of rotating machinery, and their performance directly affects the operational quality of the rotating system. Foil-type dynamic pressure gas, using ambient gas as a lubricating medium, forms a dynamic pressure gas film between the rotor and the top layer of flat foils, thereby generating load-bearing capacity. It offers advantages such as oil-free operation, low vibration, low friction, high speed, good environmental adaptability, and long service life. It also possesses good shock resistance and strong self-adaptability, ensuring stable operation of the spindle at high speeds. It has been widely used in high-speed rotating machinery such as turbine expanders, centrifugal fans, and centrifugal compressors for hydrogen fuel cell vehicles.

[0003] Foil hydrodynamic gas bearings consist of elastic foils and flat foils. Currently, the most widely used elastic foils include corrugated foil, bubble foil, and wire mesh foil. Among them, corrugated foil hydrodynamic gas bearings have high dimensional accuracy, are difficult to process, are prone to eccentricity during assembly, and have unstable dynamic characteristics; bubble foil hydrodynamic gas bearings are difficult to form, have high structural rigidity, are prone to friction damage during start-up and shutdown and during operation, and have insufficient impact resistance; wire mesh hydrodynamic gas bearings have complex processes, are difficult to process, and are difficult to assemble. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a foil dynamic pressure gas thrust bearing with a broken wall protrusion. This bearing has a simple structure, is easy to manufacture and assemble, and has good rigidity and damping characteristics. It can improve the load-bearing capacity and stability of the gas bearing, thereby meeting the usage requirements under different conditions.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a wall-breaking protrusion type foil dynamic pressure gas thrust bearing, comprising a flat foil (1), an elastic foil (2) and a bearing seat (3), wherein the upper end face of the bearing seat (3) is provided with the elastic foil (2), and the upper end face of the elastic foil (2) is provided with the flat foil (1); the elastic foil (2) is provided with wall-breaking protrusions (4); the wall-breaking protrusions (4) are evenly arranged circumferentially on the upper end face or the lower end face of the elastic foil (2), and are evenly arranged radially or staggered; the wall-breaking protrusions (4) have openings, and the shape, size and direction of the openings can be freely controlled; the two sides of the wall-breaking protrusions (4) are integrated with the elastic foil or disconnected at a certain distance.

[0006] Furthermore, the flat foil is a single layer, and the elastic foil is a single layer or multiple layers; the shape of the elastic foil and the flat foil includes multiple fan-shaped or ring-shaped pieces; when multiple fan-shaped pieces are used, the elastic foil and the flat foil are evenly distributed on the bearing seat.

[0007] Furthermore, the shape of the wall-breaking protrusion includes ellipsoidal protrusions, spherical protrusions, or spindle-shaped protrusions, which are expressed by the following parametric equations:

[0008] [Formula 1]

[0009]

[0010] Where θ: rotation angle; φ: centrifugal angle; a, b: equatorial radius; c: polar radius.

[0011] Compared with the prior art, the beneficial effects of the technical solution of the present invention are as follows:

[0012] This invention provides a perforated foil hydrodynamic gas thrust bearing. Compared to corrugated foil bearings and wire mesh bearings, this bearing has a simpler structure, is easier to manufacture, and is easier to assemble. Compared to bubbling foil bearings, the elastic element of this bearing's elastic foil uses perforated protrusions, resulting in better elastic deformation capacity and stiffness adjustability. The perforated protrusions are evenly arranged circumferentially, radially, or staggered on the elastic foil, giving the bearing better load uniformity. By changing the shape, size, and opening direction of the perforated protrusions, the bearing's stiffness and load-bearing capacity can be adjusted to further meet the requirements of use under different conditions. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a wall-breaking protruding foil dynamic pressure gas thrust bearing structure provided in Embodiment 1 of the present invention;

[0014] Figure 2 This is a schematic diagram of the elastic foil structure provided in Embodiment 1 of the present invention;

[0015] Figure 3 This is a schematic diagram of the wall-breaking protrusion structure provided in Embodiment 1 of the present invention;

[0016] Figure 4 This is a schematic diagram showing the separation of the two sides of the wall-breaking protrusion from the elastic foil provided in Embodiment 1 of the present invention.

[0017] Figure 5 This is a schematic diagram of the elastic foil structure with interlaced wall-breaking protrusions provided in Embodiment 2 of the present invention;

[0018] Figure 6 This is a schematic diagram of the dynamic pressure gas thrust bearing structure of the double-sided wall-breaking protruding elastic foil provided in Embodiment 3 of the present invention;

[0019] Figure 7 This is a schematic diagram of the elastic foil structure provided in Embodiment 3 of the present invention;

[0020] Figure 8This is a schematic diagram of the dynamic pressure gas thrust bearing structure of the double-layer wall-breaking protruding elastic foil provided in Embodiment 4 of the present invention;

[0021] Figure 9 This is a schematic diagram of the integral flat foil structure provided in Embodiment 5 of the present invention;

[0022] Figure 10 This is a schematic diagram of the integral elastic foil structure provided in Embodiment Six of the present invention;

[0023] In the image above, 1 is a flat foil, 2 is an elastic foil, 3 is a bearing seat, and 4 is a wall-breaking protrusion. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0025] Example 1:

[0026] The present invention provides a structure for a wall-breaking protruding foil dynamic pressure gas thrust bearing, as shown in the figure. Figure 1 As shown, the bearing includes a flat foil 1, an elastic foil 2, and a bearing seat 3, wherein the upper end face of the bearing seat 3 is provided with an elastic foil 2, and the upper end face of the elastic foil 2 is provided with a flat foil 1; the elastic foil 2 and the flat foil 1 are four fan-shaped pieces.

[0027] like Figure 2 As shown, the wall-breaking protrusions 4 are evenly arranged radially and circumferentially on the upper end face of the elastic foil 2, and the apex of the wall-breaking protrusions is attached to the lower end face of the flat foil; the elastic foil 2 with the wall-breaking protrusions is formed by one stamping.

[0028] like Figure 3 As shown, the shape of the wall-breaking protrusion 4 includes an ellipsoidal protrusion, a spherical protrusion, or a spindle-shaped protrusion; the wall-breaking protrusion 4 has an opening, the direction of which can be freely controlled.

[0029] like Figure 4 As shown, the two sides of the wall-breaking protrusion 4 are disconnected from the upper surface of the elastic foil.

[0030] Example 2:

[0031] This embodiment has a basically the same structure as Embodiment 1, except that: Figure 5 As shown, the wall-breaking protrusions on the elastic foil 2 are arranged in an alternating pattern.

[0032] Example 3:

[0033] This embodiment has a basically the same structure as Embodiment 1, except that: Figure 6 , Figure 7As shown, the upper and lower end faces of the elastic foil 2 are provided with wall-breaking protrusions 4, wherein the apex of the wall-breaking protrusion on the upper end face of the elastic foil is in contact with the lower end face of the flat foil 1, and the apex of the wall-breaking protrusion on the lower end face of the elastic foil is in contact with the upper end face of the bearing seat 3.

[0034] Example 4:

[0035] This embodiment has a basically the same structure as Embodiment 1, except that: Figure 8 As shown, the bearing is supported by a double-layered, convex elastic foil, with the two elastic foils arranged in an overlapping manner.

[0036] Example 5:

[0037] This embodiment has a basically the same structure as Embodiment 1, except that: Figure 9 As shown, the bearing foil is a ring-shaped integral piece.

[0038] Example 6:

[0039] This embodiment has a basically the same structure as Embodiment 1, except that: Figure 10 As shown, the bearing's elastic foil is a single ring.

[0040] This invention has the advantages of simple structure, convenient manufacturing, and easy assembly. The elastic foil has radial or circumferential protrusions, which improves the elastic deformation capacity and stiffness adjustability of the bearing. The protrusions are evenly distributed radially or circumferentially on the elastic foil, giving the bearing better load-bearing uniformity. Changing the shape, size, and opening direction of the protrusions can adjust the bearing's elasticity and load-bearing capacity, further improving the bearing's load-bearing capacity and stability.

[0041] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be considered that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the scope of patent protection determined by the claims submitted by the present invention.

Claims

1. A foil-type dynamic pressure gas thrust bearing with broken walls and raised surfaces, characterized in that, The assembly includes a flat foil (1), an elastic foil (2), and a bearing seat (3), wherein the upper end face of the bearing seat (3) is provided with an elastic foil (2), and the upper end face of the elastic foil (2) is provided with a flat foil (1); the elastic foil (2) is provided with a wall-breaking protrusion (4); the wall-breaking protrusion (4) is evenly arranged circumferentially on the upper or lower end face of the elastic foil (2), and is evenly arranged or staggered radially; the wall-breaking protrusion (4) has an opening, and the shape, size and direction of the opening can be freely controlled; the two sides of the wall-breaking protrusion (4) are connected to the elastic foil or disconnected at a certain distance; The shape of the wall-breaking protrusion (4) includes ellipsoidal protrusion, spherical protrusion, or spindle-shaped protrusion, and is expressed by the following parametric equation: [Formula 1] Where θ: rotation angle; φ: centrifugal angle; a, b: equatorial radius; c: polar radius.

2. The wall-breaking protruding foil dynamic pressure gas thrust bearing according to claim 1, characterized in that, The flat foil (1) is one layer, and the elastic foil (2) is one or more layers; the shape of the elastic foil (2) and the flat foil (1) includes multiple fan-shaped or ring-shaped pieces; when multiple fan-shaped pieces are used, the elastic foil (2) and the flat foil (1) are evenly distributed on the bearing seat (3).

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