CN207892994U - A kind of gas bush(ing) bearing - Google Patents

Abstract

The utility model relates to a gas radial sliding bearing, which belongs to the technical field of sliding bearings. The lubricating fluid of the sliding bearing is gas, including the journal and the bearing bush. The inner side of the bearing bush is provided with a uniform micro-texture, and the micro-texture area is symmetrically distributed along the bearing center in the axial direction; the axial length of the micro-texture area is l, The ratio of the axial length of the micro-textured region l to the axial length L of the bearing bush is (0.2-1.0):1; the angle of the micro-textured region in the circumferential direction is β ₂ ‑β ₁ , and β ₁ is the micro-textured region Circumferential starting angle, β ₂ is the circumferential ending angle of the micro-textured region, where 30°≤β ₁ <β ₂ ≤180°, 15°≤β ₂ ‑β ₁ ≤130°. The micro-texture on the surface of the bearing pad of the utility model can effectively improve the lubrication performance of the friction pair and increase the service life of the gas sliding bearing; the existence of the micro-texture on the bearing pad can expand the gas film bearing area and increase the stability of the gas radial sliding bearing; According to the calculation, micro-texture processing on some bearing pads can effectively increase the bearing capacity and stiffness of the gas film.

Description

A gas radial sliding bearing

technical field

The utility model relates to a gas radial sliding bearing, which belongs to the technical field of sliding bearings.

Background technique

Since the middle of the last century, gas lubrication technology has developed rapidly, especially in recent years, gas radial sliding bearings have broken the dominance of liquid lubrication. Compared with liquid lubrication, gas radial sliding bearings have the advantages of high speed, high precision, low power consumption and long life. Since the viscosity of gas is about one-thousandth of that of liquid, gas bearings can work at extremely high speeds with almost no friction and wear; in addition, gas radial sliding bearings have excellent characteristics such as cleanness, high temperature and low temperature resistance. Therefore, it is used more and more widely and is welcomed in various fields. However, since the lubricant used in gas radial sliding bearings is gas, it has lower load-carrying capacity, lower stiffness, and poorer stability than liquid lubrication, and gas radial sliding bearings are prone to instability.

At present, the research and improvement of the surface structure of sliding bearings are all focused on oil-lubricated or grease-lubricated sliding bearings. "A tapered dynamic and static pressure bearing assembly with shaft diameter surface texture" applied in Chinese patent CN106870562A, which is to process the surface texture on the surface of a tapered bearing journal lubricated by pressure water or pressure oil, and oil Cavity and throttle and other structures cooperate to reduce temperature rise and increase rotational speed. In addition, some patents and papers have improved and researched liquid sliding bearings to achieve the purpose of increasing the speed, reducing the temperature rise, and enhancing the lubrication characteristics. However, the gas bearing itself has the characteristics of high operating speed and small friction and wear. The compressibility of gas and the absence of cavitation in gas lubricated bearings are not suitable for gas lubricated bearings.

Utility model content

Aiming at the problems existing in the prior art, the utility model provides a gas radial sliding bearing, which can effectively improve the lubricating performance between the friction pairs, thereby greatly prolonging the service life of the sliding bearing; The micro-texture is processed on the surface to expand the bearing area of the air film, increase the stability of the radial sliding bearing, and increase the bearing capacity and stiffness of the air film.

The technical scheme that the utility model adopts for solving its technical problem is:

A gas radial sliding bearing, the lubricating fluid is gas, including a journal and a bearing pad, the inner side of the bearing pad is provided with a uniform micro-texture, and the micro-texture area is symmetrically distributed along the bearing center in the axial direction; the micro-texture area is axially The length is l, and the ratio of the axial length of the micro-textured area is l to the axial length of the bearing pad L is (0.2～1.0):1; the angle of the micro-textured area in the circumferential direction is β ₂ -β ₁ , and β ₁ is Micro-textured area circumferential starting angle, β ₂ is the circumferential end angle of micro-textured area, where 30°≤β ₁ <β ₂ ≤180°, 15°≤β ₂ -β ₁ ≤150°;

The micropore density _Sp of the microtexture is 10-95%;

The micropore depth-to-diameter ratio _ε1 of the microtexture is 0.005 to 0.5, and the micropore depth of the microtexture is 0.1 to 100 μm;

The micro-texture is one or more of cylindrical pits, cuboid pits, spherical pits, triangular prism pits, and polygonal prism pits;

Preferably, the ratio of the axial length l of the micro-textured region to the axial length L of the bearing pad is: 0.4≤l/L≤0.8;

The micro-texture on the journal surface textured gas radial sliding bearing bush of the utility model can be processed by existing processes such as laser processing, electrochemical corrosion, and electric spark.

Working principle: When the gas radial sliding bearing is running, due to the gas dynamic pressure effect, a wedge-shaped gas film is formed between the journal and the bearing bush. Due to the existence of micro-texture, the gas film bearing area is elongated, so that the gas film The stability increases; the pressure drop from the low-pressure area to the micro-textured area decreases on the circumferential section of the bearing, which increases the flow rate in this area, resulting in an increase in the pressure drop of the gas from the textured area to the high-pressure area, that is, the maximum pressure increases. The existence of the micro-textured area less than 90° reduces the pressure at this place, thereby increasing the overall bearing capacity; the existence of the micro-textured area reduces the pressure at this area, resulting in a decrease in the deflection angle, thereby increasing the overall bearing capacity.

The beneficial effects of the utility model:

(1) The utility model increases the bearing capacity and rigidity of the sliding bearing gas film through the above-mentioned working principle by processing a micro-texture with a certain shape and density on the surface of the gas radial sliding bearing bush;

(2) The utility model processes the surface texture on the surface of the bearing bush of the gas radial sliding bearing, which can effectively improve the lubrication performance of the friction pair, thereby increasing the service life of the sliding bearing;

(3) The utility model can expand the air film bearing area by processing the micro-texture on the bearing bush of the sliding bearing, and increase the stability of the radial sliding bearing.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the gas radial sliding bearing of the embodiment;

Fig. 2 is a schematic diagram of the structure of the gas radial sliding bearing when the rotating speed of the embodiment is reversed;

Fig. 3 is a schematic diagram of the structure of the bearing pad of the gas radial sliding bearing of the embodiment;

Fig. 4 is a schematic diagram of the expansion of the bearing pad of the gas radial sliding bearing along the circumferential direction of the embodiment;

Fig. 5 is the schematic diagram of the pit structure of the embodiment;

Fig. 6 is the circumferential pressure distribution diagram of the axial center position of the smooth bearing without microtexture and the gas radial sliding bearing with cylindrical microtexture in embodiment 1;

Figure 7 is a distribution diagram of the air film thickness of a smooth bearing without micro-texture;

Fig. 8 is a gas film thickness distribution diagram of a gas radial sliding bearing with a cylindrical micro-texture in Embodiment 1;

Fig. 9 is a pressure distribution diagram of a smooth bearing without micro-texture;

Fig. 10 is a pressure distribution diagram of a gas radial sliding bearing with a cylindrical micro-texture in Embodiment 1;

In the figure: 1-bearing bush, 2-micro-texture, 3-journal, β ₁ -circumferential start angle of micro-texture area, β ₂ -circumferential end angle of micro-texture area, e-eccentricity, φ-deflection angle , l-the axial length of the micro-textured region, L-the axial length of the bearing, D-the diameter of the journal, D1-the diameter of the inner wall of the bearing bush, ω-the rotational angular velocity of the journal.

Detailed ways

Below in conjunction with specific embodiment, the utility model is further described.

Embodiment 1: As shown in Figures 1 to 5, a gas radial sliding bearing, the lubricating fluid is gas, including a journal and a bearing pad, and the inside of the bearing pad is provided with a uniform micro-texture, and the micro-textured area is axially along the The bearing center is symmetrically distributed; the axial length of the micro-textured area is l, where l=12mm, the axial length of the bearing pad is L=20mm, and the ratio of the axial length of the micro-textured area to the axial length L of the bearing pad is 0.6:1 ; The angle of the micro-textured area in the circumferential direction is β ₂ - β ₁ , β ₁ is the circumferential start angle of the micro-textured area, and β ₂ is the circumferential end angle of the micro-textured area, where β ₁ =50°, β ₂ = 110°, β ₂ -β ₁ = 60°;

The micropore density _Sp of the microtexture in this embodiment is 50.27%;

In this embodiment, the micropore depth-to-diameter ratio _ε1 of the microtexture is 0.0083, and the micropore depth of the microtexture is 5 μm;

In this embodiment, the micro-texture is a cylindrical pit;

In this embodiment, the micro-texture is evenly distributed along the axial and circumferential directions in the region and the journal is smooth;

The gas film thickness distribution diagram of the smooth bearing without microtexture is shown in Figure 7, and the gas film thickness distribution diagram of the gas radial sliding bearing with cylindrical microtexture in this embodiment is shown in Figure 8, and the smooth bearing without microtexture The pressure distribution diagram is shown in Figure 9, and the pressure distribution diagram of the gas radial sliding bearing with cylindrical micro-texture in this embodiment is shown in Figure 10; from Figures 7 to 10, it can be seen that when the gas radial sliding bearing is running, due to the gas Due to the dynamic pressure effect, a wedge-shaped air film is formed between the journal and the bearing bush. Due to the existence of micro-texture, the air film bearing area is elongated, and the stability of the air film of the sliding bearing is increased; The pressure drop in the textured area decreases, which increases the flow rate in this area, resulting in an increase in the pressure drop of the gas from the textured area to the high-pressure area, that is, the increase in the maximum pressure. The existence of the micro-textured region less than 90° reduces the pressure at this place, thereby increasing the overall bearing capacity; the existence of the micro-textured area reduces the pressure at this place, resulting in a decrease in the deflection angle, thereby increasing the overall bearing capacity;

Compare the gas radial sliding bearing described in this example with the smooth sliding bearing without micro-texture on the bearing pad with the same parameters; working condition parameters: the working temperature is T=300K, and the radial clearance is h ₀ =5×10 when there is no eccentricity ^-6 m, eccentricity ε＝0.5, working pressure of bearing inlet and outlet both P ₁ ＝P ₂ ＝1×10 ⁵ Pa, journal speed ω＝4×10 ⁴ r/min; the results are shown in Table 1 below :

Table 1 Performance comparison of micro-textured gas bearings and smooth surface gas bearings

The calculation results show that the bearing capacity of the gas radial sliding bearing described in the utility model is increased by about 10% compared with the smooth sliding bearing without micro-texture on the bearing pad under the same conditions, the stiffness of the gas film is increased by about 6.4%, and there is no micro-texture Figure 6 shows the circumferential pressure distribution diagram of the smooth bearing and the axial center position of the cylindrical micro-textured gas radial sliding bearing in this embodiment. It can be seen from Figure 6 that the gas film bearing area increases, that is, the gas radial sliding The stability of the bearing is increased; it can be seen that the gas radial sliding bearing of this embodiment has better stability and load-bearing characteristics.

Embodiment 2: As shown in Figures 1 to 5, a gas radial sliding bearing, the lubricating fluid is gas, including a journal and a bearing bush, and the inside of the bearing bush is provided with a uniform micro-texture, and the micro-textured area is axially along the The bearing center is symmetrically distributed; the axial length of the micro-textured area is l, where l=10mm, the axial length of the bearing pad is L=50mm, and the ratio of the axial length of the micro-textured area to the axial length L of the bearing pad is 0.2: 1; The angle of the micro-textured area in the circumferential direction is β ₂ - β ₁ , β ₁ is the circumferential start angle of the micro-textured area, β ₂ is the circumferential end angle of the micro-textured area, where β ₁ = 30°, β ₂ = 45°, β ₂ -β ₁ = 15°;

The micropore density _Sp of microtexture in the present embodiment is 95%;

In this embodiment, the micropore depth-to-diameter ratio _ε1 of the microtexture is 0.005, and the micropore depth of the microtexture is 0.1 μm;

In this embodiment, the micro-texture is a cuboid pit, and the projection shape of the pit is a square;

In this embodiment, the micro-texture is evenly distributed along the axial and circumferential directions in the region and the journal is smooth;

The operating parameters of this embodiment are the same as those of Embodiment 1.

Embodiment 3: As shown in Figures 1 to 5, a gas radial sliding bearing, the lubricating fluid is gas, including a journal and a bearing pad, the inside of the bearing pad is provided with a uniform micro-texture, and the micro-texture area is axially along the The bearing center is symmetrically distributed; the axial length of the micro-textured area is l, where l=50mm, the axial length of the bearing pad is L=50mm, and the ratio of the axial length of the micro-textured area to the axial length L of the bearing pad is 1:1 ; The angle of the micro-textured area in the circumferential direction is β ₂ - β ₁ , β ₁ is the circumferential start angle of the micro-textured area, and β ₂ is the circumferential end angle of the micro-textured area, where β ₁ =30°, β ₂ = 180°, β ₂ -β ₁ = 150°;

The micropore density _Sp of the microtexture in this embodiment is 10%;

In this embodiment, the micropore depth-to-diameter ratio _ε1 of the microtexture is 0.5, and the micropore depth of the microtexture is 100 μm;

In this embodiment, the micro-texture is a spherical hollow;

In this embodiment, the micro-texture is evenly distributed along the axial and circumferential directions in the region and the journal is smooth;

The operating parameters of this embodiment are the same as those of Embodiment 1.

Embodiment 4: As shown in Figures 1 to 5, a gas radial sliding bearing, the lubricating fluid is gas, including a journal and a bearing pad, the inner side of the bearing pad is provided with a uniform micro-texture, and the micro-textured area is axially along the The bearing center is symmetrically distributed; the axial length of the micro-textured area is l, where l=20mm, the axial length of the bearing pad is L=50mm, and the ratio of the axial length of the micro-textured area to the axial length L of the bearing pad is 0.4: 1; The angle of the micro-textured area in the circumferential direction is β ₂ - _{β 1} , β ₁ is the circumferential start angle of the micro-textured area, β ₂ is the circumferential end angle of the micro-textured area, where β ₁ =90°, β ₂ = 180°, β ₂ -β ₁ = 90°;

The micropore density _Sp of microtexture in the present embodiment is 30%;

In this embodiment, the micropore depth-to-diameter ratio _ε1 of the microtexture is 0.1, and the micropore depth of the microtexture is 25 μm;

In this embodiment, the micro-texture is a triangular prism-shaped pit, and the projected shape of the pit is an equilateral triangle;

In this embodiment, the micro-texture is evenly distributed along the axial and circumferential directions in the region and the journal is smooth;

The operating parameters of this embodiment are the same as those of Embodiment 1.

Embodiment 5: As shown in Figures 1 to 5, a gas radial sliding bearing, the lubricating fluid is gas, including a journal and a bearing pad, the inside of the bearing pad is provided with a uniform micro-texture, and the micro-texture area is axially along the The bearing center is symmetrically distributed; the axial length of the micro-textured area is l, where l=40mm, the axial length of the bearing pad is L=50mm, and the ratio of the axial length of the micro-textured area to the axial length L of the bearing pad is 0.8: 1; The angle of the micro-textured area in the circumferential direction is β ₂ - _{β 1} , β ₁ is the circumferential start angle of the micro-textured area, β ₂ is the circumferential end angle of the micro-textured area, where β ₁ = 30°, β ₂ = 90°, β ₂ -β ₁ = 60°;

The micropore density _Sp of microtexture in the present embodiment is 60%;

In this embodiment, the micropore depth-to-diameter ratio _ε1 of the microtexture is 0.01, and the micropore depth of the microtexture is 1 μm;

In this embodiment, the micro-texture is a polygonal prismatic pit; the projected shape of the pit is a regular hexagon;

In this embodiment, the micro-texture is evenly distributed along the axial and circumferential directions in the region and the journal is smooth;

The operating parameters of this embodiment are the same as those of Embodiment 1.

Embodiment 6:

Part of the micro-textured gas radial sliding bearing of the bearing pad in this embodiment is basically the same as the structure of embodiment 1, the difference is that the micro-texture in this embodiment is cuboid-shaped pits and cylindrical pits distributed evenly and alternately; The projection shape of the cuboid pit is a square.

Embodiment 7:

Part of the micro-textured gas radial sliding bearing of the bearing pad in this embodiment is basically the same as that in Embodiment 2, the difference is that the micro-texture in this embodiment is cylindrical pits, cuboid pits and The polygonal prism pit; the projection shape of the cuboid pit is a square; the projection shape of the polygonal prism pit is a regular hexagon.

The micropore density _Sp of microtexture in the present embodiment is 40%;

Embodiment 8:

Part of the micro-textured gas radial sliding bearing of the bearing pad in this embodiment is basically the same as the structure of embodiment 3, the difference is that the micro-texture in this embodiment is evenly distributed spherical and cylindrical pits and a cuboid pit; the projected shape of a cuboid pit is a square.

Embodiment 9:

Part of the micro-textured gas radial sliding bearing of the bearing pad in this embodiment is basically the same as the structure of embodiment 4, the difference is that in this embodiment, the micro-texture is evenly distributed cylindrical pits, cuboid pits, Spherical pits and triangular prism-shaped pits; cuboid-shaped pits whose projected shape is a square; and triangular prism-shaped pits whose projected shape is an equilateral triangle.

Example 10:

Part of the micro-textured gas radial sliding bearing of the bearing pad in this embodiment is basically the same as the structure of embodiment 5, the difference is that in this embodiment, the micro-texture is evenly distributed cylindrical pits, cuboid pits, Spherical dimples, triangular prism dimples and polygonal prism dimples. The projection shape of the cuboid pit is a square; the projection shape of the triangular prism pit is an equilateral triangle; the projection shape of the multi-prism pit is a regular hexagon;

The micropore density _Sp of the microtexture in this embodiment is 20%.

The specific embodiments of the utility model have been described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned embodiments. Various changes are made.

Claims (4)

1. a kind of gas bush(ing) bearing, it is characterised in that：Lubricating fluid is gas, including axle journal and bearing shell, bearing shell inside It is provided with uniform micro- texture, micro- texture area is symmetric along bearing centre in the axial direction；Micro- texture area axial length For l, wherein micro- texture area axial length is l and the ratio of bearing shell axial length L is (0.2~1.0):1；Micro- texture area is in week Upward angle is β₂-β₁, β₁For micro- texture area circumferential direction initial angle, β₂For micro- texture area circumferential direction ending corner, wherein 30 °≤β₁ ＜ β₂≤ 180 °, 15 °≤β₂-β₁≤150°。

2. gas bush(ing) bearing according to claim 1, it is characterised in that：The pore density S of micro- texture_pFor 10~ 95%.

3. gas bush(ing) bearing according to claim 1, it is characterised in that：The micropore aspect ratio ε of micro- texture₁It is 0.005 ~0.5, the micropore depth of micro- texture is 0.1~100 μm.

4. gas bush(ing) bearing according to claim 1, it is characterised in that：Micro- texture is cylindrical pit, cuboid Shape pit, segment-shaped pit, triangular prism shaped pit, multi-edge column-shaped pit it is one or more.