Wear-resistant and high-load-bearing hydrodynamic thrust bearings and bearing self-adjustment methods

Abstract

This invention relates to the field of gas-lubricated bearings, and more particularly to a wear-resistant and high-load-bearing hydrodynamic thrust bearing and its control method. By coordinating the operation of a displacement sensor, a controller, and a precision lifting platform, the wedge height of the top foil can be effectively adjusted, thereby controlling the minimum gas film thickness to be greater than a set value. This prevents the gas film gap from being too small, causing contact friction between the rotor and the top foil. Simultaneously, this invention can also actively control the ratio of the wedge height of the top foil to the minimum gas film thickness within a certain range to actively maintain the bearing's load-bearing capacity at a high level. It is generally believed that the thrust bearing's load-bearing capacity is closely related to the ratio of the wedge height to the minimum gas film thickness, with the ratio range set to 2-5. This invention can control the minimum gas film thickness to be greater than a set value to prevent contact friction between the rotor and the top foil, and can also actively control the ratio of the wedge height of the top foil to the minimum gas film thickness within a certain range to actively maintain the bearing's load-bearing capacity at a high level.

Description

Technical Field

[0001] This invention relates to the field of gas-lubricated bearings, and more particularly to a wear-resistant and high-load-bearing hydrodynamic thrust bearing and a bearing self-regulation method. Background Technology

[0002] Currently, gas-lubricated hydrodynamic bearings are widely used in aerospace, precision instruments, and ultra-precision machine tools. Bearing capacity is an important indicator for evaluating bearing performance. Generally, at the same rotational speed, the smaller the gas film clearance, the higher the bearing capacity. However, if the gas film clearance decreases to a certain extent, it will cause frictional contact between the rotor and the top foil, resulting in irreversible wear of the bearing.

[0003] Specifically, when the rotor is subjected to axial load, it will undergo axial displacement, causing it to move closer to or away from the bearing. When it moves closer, it may experience dry friction with the bearing and cause bearing wear. When it moves away from the bearing, the bearing clearance capacity will decrease, making it unable to maintain a stable load-bearing capacity and causing the rotor to oscillate.

[0004] Therefore, it is essential to develop a wear-resistant and high-load-bearing hydrodynamic thrust bearing and its control method. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a wear-resistant and high-load-bearing dynamic pressure thrust bearing with adjustable wedge height of top foil that can solve the above-mentioned problems, and a bearing self-adjustment method.

[0006] To solve the above-mentioned technical problems, the present invention discloses a wear-resistant and high load-bearing dynamic pressure thrust bearing, including a bearing housing and a top foil disposed on the bearing housing. A corrugated foil is provided between the top foil and the bearing housing. The top foil includes a top foil contact surface disposed on the corrugated foil and not in contact with the bearing housing, a top foil base fixed on the bearing housing, and a connecting section connecting the top foil base and the top foil contact surface.

[0007] A lifting platform is provided between the corrugated foil and the bearing seat, which can drive the corrugated foil to move up and down.

[0008] Furthermore, the lifting platform is equipped with a top foil displacement sensor for collecting the height of the lifting platform from the top foil contact surface; the bearing seat is equipped with a rotor displacement sensor for collecting the height of the lifting platform from the rotor.

[0009] Furthermore, it also includes a controller for receiving height information collected by the top foil displacement sensor and the rotor displacement sensor, and for determining and controlling the displacement of the lifting platform.

[0010] Furthermore, the opening direction of the top foil is the same as the rotation direction of the rotor.

[0011] Further, a lifting table fixing groove for placing the lifting table is provided on the bearing seat.

[0012] Further, the top foil and the wave foil are made of flexible metal foils.

[0013] Further, the thickness of the flexible metal foil is 0.1 mm - 0.2 mm.

[0014] The present invention also discloses a self-regulation method for a hydrodynamic thrust bearing with anti-wear and high load-carrying capacity. Based on the above-mentioned hydrodynamic thrust bearing with anti-wear and high load-carrying capacity, the method further includes the following steps:

[0015] S1. The top foil displacement sensor and the rotor displacement sensor respectively collect the distance between the lifting table and the contact surface of the top foil and the distance between the bearing seat and the rotor, so as to obtain the height δ of the top foil contact surface and the minimum air film h between the top foil contact surface and the rotor, min and transmit the information to the controller;

[0016] S2. The controller judges whether the minimum air film h min is greater than the set value h1;

[0017] If the minimum air film h min is less than the set value h1, then control the lifting table to descend to reduce the height δ of the top foil contact surface, and re-execute step S1;

[0018] S3. If the minimum air film h min is greater than the set value h1, then continue to judge whether the ratio of the height δ to the minimum air film h min is within the set value range, and the set value range is A ≥ δ / h min ≥ B;

[0019] If the ratio of the height δ to the minimum air film h min is within the set value range, then control the lifting table to maintain the top foil wedge height δ,

[0020] and re-execute step S1;

[0021] S4. If the ratio of the height δ to the minimum air film h min is not within the set value range, then continue to judge whether δ / h min ≥ A;

[0022] If δ / h min ≥ A, then control the lifting table to reduce the top foil wedge height δ;

[0023] If δ / h min < A, then control the lifting table to increase the top foil wedge height δ, and re-execute step S1.

[0024] Furthermore, the set value h1 is 2μm-3μm, the set value A is 2-3μm, and the set value B is 4-5μm.

[0025] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0026] This invention adjusts the height of the top foil by regulating the height of the straight section, thereby controlling the minimum gap between the rotor and the top foil. When the rotor approaches the top foil, the straight section of the top foil actively moves away from the rotor; conversely, when the rotor moves away from the top foil, the straight section of the top foil actively moves closer to the rotor. Furthermore, by simply replacing the top foil bases with different heights, the height of the wedge-shaped section of the top foil can be adjusted indefinitely, maintaining the optimal gap ratio and preventing top foil wear. Attached Figure Description

[0027] Figure 1 This is an assembly diagram of the hydrodynamic thrust bearing in this invention;

[0028] Figure 2 This is a schematic diagram showing the relationship of the dynamic thrust bearing before assembly in this invention;

[0029] Figure 3 This is a schematic diagram of the single-piece bearing and rotor structure in this invention;

[0030] Figure 4 This is a schematic diagram of the dynamic thrust bearing in this invention. Detailed Implementation

[0031] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings.

[0032] This invention provides a wear-resistant and high-load-bearing hydrodynamic thrust bearing, such as... Figure 1 As shown, the bearing system consists of 6 bearings distributed periodically.

[0033] like Figure 2 As shown, the top foil 1 is laid flat on the corrugated foil 2, and one end is fixed to the bearing seat 6; one end of the corrugated foil 2 is fixed to the lifting platform 3, and the lifting platform 3 is fixed to the bearing seat 6; a top foil displacement sensor 4 is also installed on the lifting platform 3 to collect the wedge height of the top foil 1; a rotor displacement sensor 5 is also installed on the bearing seat 6 to collect the height of the rotor 7.

[0034] like Figure 3 As shown, there is a certain air film gap between the rotor 7 and the top foil 1. The top foil 1 covers the corrugated foil 2, the corrugated foil 2 is stacked on the lifting platform 3, and the lifting platform 3 is fixed on the bearing seat 6.

[0035] like Figure 4The top foil 1 shown has a wedge-shaped cross section. The top foil 1 includes a top foil contact surface 11 disposed on the corrugated foil 2 and not in contact with the bearing seat 6, a top foil base 12 fixed on the bearing seat 6, and a connecting section 13 connecting the top foil base 12 and the top foil contact surface 11.

[0036] The controller 8 uses signal lines to connect the top foil displacement sensor 4, the rotor displacement sensor 5, and the lifting platform 3. The lifting platform 3 moves axially up and down according to the instructions of the controller 8 to control the wedge height δ of the top foil 1, so as to control the minimum air film thickness to be greater than the set value, so as to prevent the rotor from contacting and rubbing against the top foil. At the same time, it can also actively control the ratio of the wedge height of the top foil to the minimum air film thickness to keep it within a certain range, so as to actively maintain the bearing load at a high level.

[0037] The control method for wear-resistant and high-load-bearing hydrodynamic thrust bearings is as follows:

[0038] S1. The top foil displacement sensor 4 and the rotor displacement sensor 5 respectively collect the distance between the lifting platform 3 and the top foil contact surface 11 and the distance between the bearing seat 6 and the rotor 7, to obtain the height δ of the top foil contact surface 11 and the minimum air film h between the top foil contact surface 11 and the rotor 7. min And transmit the information to controller 8;

[0039] S2. Controller 8 determines the minimum air film h. min Is it greater than the set value h1?

[0040] If the minimum air film h min If the height is less than the set value h1, the lifting platform 3 is lowered to reduce the height δ of the top foil contact surface 11, and step S1 is executed again.

[0041] S3. If the minimum air film h min If the value is greater than the set value h1, then continue to compare the height δ with the minimum air film h. min Whether the ratio is within a set value range, wherein the set value range is A≥δ / h min ≥B; where h1 is 2μm-3μm; set value A is 2-3μm, set value B is 4-5μm;

[0042] If the height δ is related to the minimum air film h min If the ratio is within the set value range, then control the lifting platform 3 to maintain the wedge height δ of the top foil and re-execute step S1;

[0043] S4. If the height δ is equal to the minimum air film h min If the ratio is not within the set range, continue to determine whether δ / h min ≥A;

[0044] If δ / h min If A ≥ A, then control the lifting platform 3 to reduce the wedge height δ of the top foil;

[0045] If δ / h min <A, then control the lifting platform 3 to increase the top foil wedge height δ, and re - execute step S1.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above - mentioned specific embodiments. The above - mentioned specific embodiments and the descriptions in the specification are only for further explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope claimed by the present invention is defined by the claims and their equivalents.

Claims

1. A wear-resistant and high-load-bearing hydrodynamic thrust bearing, comprising a bearing housing (6) and a top foil (1) disposed on the bearing housing (6), wherein a corrugated foil (2) is provided between the top foil (1) and the bearing housing (6), characterized in that: The top foil (1) includes a top foil contact surface (11) disposed on the corrugated foil (2) and not in contact with the bearing seat (6), a top foil base (12) fixed on the bearing seat (6), and a connecting section (13) connecting the top foil base (12) and the top foil contact surface (11). A lifting platform (3) is provided between the corrugated foil (2) and the bearing seat (6) to drive the corrugated foil (2) to move up and down. The lifting platform (3) is equipped with a top foil displacement sensor (4) for collecting the height of the lifting platform (3) from the top foil contact surface (11); the bearing seat (6) is equipped with a rotor displacement sensor (5) for collecting the height of the lifting platform (3) from the rotor (7).

2. The wear-resistant and high-load-bearing hydrodynamic thrust bearing according to claim 1, characterized in that: It also includes a controller (8) for receiving height information collected by the top foil displacement sensor (4) and the rotor displacement sensor (5), and for judging and controlling the displacement of the lifting platform (3).

3. The wear-resistant and high-load-bearing hydrodynamic thrust bearing according to claim 1, characterized in that: The opening direction of the top foil (1) is the same as the rotation direction of the rotor (7).

4. The wear-resistant and high-load-bearing hydrodynamic thrust bearing according to claim 2, characterized in that: The bearing seat (6) is provided with a lifting platform fixing groove for placing the lifting platform (3).

5. The wear-resistant and high-load-bearing hydrodynamic thrust bearing according to claim 2, characterized in that: The top foil (1) and the corrugated foil (2) are made of flexible metal foil.

6. The wear-resistant and high-load-bearing hydrodynamic thrust bearing according to claim 5, characterized in that: The thickness of the flexible metal foil is 0.1mm-0.2mm.

7. A self-regulating method for a wear-resistant and high-load-bearing hydrodynamic thrust bearing, characterized in that: The wear-resistant and high-load-bearing hydrodynamic thrust bearing according to any one of claims 3-6 further includes the following steps: S1. The top foil displacement sensor (4) and the rotor displacement sensor (5) respectively collect the distance between the lifting platform (3) and the top foil contact surface (11) and the distance between the bearing seat (6) and the rotor (7) to obtain the height of the top foil contact surface (11). δ The minimum air film distance between the contact surface (11) with the top foil and the rotor (7) h min And transmit the information to the controller (8); S2. Controller (8) determines the minimum air film h min Is it greater than the set value? h 1; If the minimum air film h min Less than the set value h 1. Then control the lifting platform (3) to descend, so as to reduce the height of the top foil contact surface (11). δ And repeat step S1; S3. If the minimum air film h min Greater than the set value h 1. Then continue to determine the height. δ With minimum air film h min Whether the ratio is within a set value range, wherein the set value range is A≥ δ / h min ≥B; If height δ With minimum air film h min If the ratio is within the set value range, then control the lifting platform (3) to maintain the wedge height of the top foil. δ And repeat step S1; S4. If the height δ With minimum air film h min If the ratio is not within the set range, continue to determine whether... δ / h min ≥A; If δ / h min If ≥A, then control the lifting platform (3) to reduce the wedge height δ of the top foil; If δ / h min <A, then control the lifting table (3) to increase the top foil wedge height δ , and re - execute step S1.

8. The self-regulating method for wear-resistant and high-load-bearing hydrodynamic thrust bearing according to claim 7, characterized in that: Setting value h 1 represents 2μm - 3μm, setting value A represents 2-3μm, and setting value B represents 4-5μm.

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