Multi-tile overlapping radial foil gas bearing and assembly method thereof

Abstract

The present invention discloses a multi-tile overlapping radial foil gas bearing and an assembly method thereof, comprising a bearing seat, a plurality of top foils, and a bottom foil; the top foil comprises a fixedly connected arc-shaped foil structure and a wire mesh structure, the bottom foil comprises a mounting position and an arched structure, the inner side of the bearing seat is provided with a plurality of slots distributed circumferentially, the wire mesh structure and the mounting position being mounted within the slots; the outer side of the bearing seat is provided with a plurality of force sensor mounting holes, laser ranging probe mounting holes, and armored thermocouple probe mounting holes, each connected to the slots and uniformly distributed circumferentially, the force sensor mounting holes, laser ranging probe mounting holes, and armored thermocouple probe mounting holes being used to mount the force sensor, laser ranging probe, and armored thermocouple probe, respectively. This application has the beneficial effects of increasing bearing capacity, real-time monitoring of operating status, facilitating processing and assembly, and reducing replacement costs.

Description

Technical Field

[0001] The present invention relates to the technical field of gas bearings, in particular to a multi-tile overlapping radial foil gas bearing and an assembly method thereof. Background Art

[0002] Radial foil gas bearings effectively support the mating rotor through the pressure generated by the air film formed between the top foil and the mating rotor. Traditional radial foil gas bearings utilize a continuous top and bottom foil structure, secured to the mating rotor via a slotted mounting system. This assembly method is difficult, and if localized damage occurs during use, the entire component must be replaced, resulting in significant losses. Furthermore, the continuous structure of traditional radial foil gas bearings is inconvenient for initial processing, and the foil molding and clamping are complex. Furthermore, if the continuous structure has a small gap with the mating rotor, it is prone to severe wear, shortening the life of the radial bearing and even causing bearing failure. If the continuous structure has a large gap with the mating rotor, an effective air film cannot be formed between the radial gas bearing and the mating rotor, reducing the radial gas bearing's load-bearing capacity and rendering it ineffective in supporting the mating rotor. Therefore, ensuring the bearing capacity of radial foil gas bearings while extending their lifespan is a key factor in improving their performance. This also requires balancing the requirements for simple machining and installation in engineering applications. In actual use, high-speed rotor systems place high demands on the bearing's load capacity and vibration suppression capabilities. Furthermore, effective monitoring of the bearing's real-time operating status is crucial to avoid failures in the bearing-rotor system at high speeds, preventing timely and effective analysis of the cause of failure. Summary of the Invention

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by this patent application is how to provide a multi-tile overlapping radial foil gas bearing and its assembly method that can improve the load-bearing capacity, monitor the operating status in real time, facilitate processing and assembly, and have low replacement cost.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A multi-tile overlapping radial foil gas bearing and an assembly method thereof, wherein the radial foil gas bearing comprises a bearing seat, a plurality of top foils, and a bottom foil; the top foil comprises an arc-shaped foil structure and a metal mesh structure, the foil structure comprising a left arc-shaped foil structure and a right arc-shaped foil structure located on either side of the metal mesh structure, the foil structure and the metal mesh structure being fixedly connected; the bottom foil comprises an installation fixing position and an arched structure, the installation fixing position being located at an end and fixedly connected to the arched structure; a plurality of slots are circumferentially distributed on the inner side of the bearing seat, the number of the slots being the same as the number of the top foil and the bottom foil, the metal mesh structure and the installation fixing position being installed in the slots;

[0006] The outer side of the bearing seat is evenly distributed along the circumference with a plurality of force sensor mounting holes, laser ranging probe mounting holes and armored thermocouple probe mounting holes. The force sensor mounting holes, laser ranging probe mounting holes and armored thermocouple probe mounting holes are used to install the force sensor, laser ranging probe and armored thermocouple probe respectively. The force sensor mounting holes, laser ranging probe mounting holes and armored thermocouple probe mounting holes are arranged opposite to the card slot and are connected to the card slot.

[0007] Wherein, the position where the foil structure of the top foil contacts the rotating shaft is coated with a wear-resistant coating.

[0008] The metal wire mesh structure is formed by mechanically winding, laminating and pressing a plurality of stainless steel wires.

[0009] Wherein, the foil structure is connected to the metal wire mesh structure by welding.

[0010] The arched structure of the bottom foil along the circumferential direction can be cut into a plurality of arched structures with different widths.

[0011] A method for assembling a multi-tile overlapping radial foil gas bearing comprises the following steps:

[0012] S1: Fit the bottom foil to the inner side of the bearing seat, with the installation and fixing position of the bottom foil fitting on one side of the slot. Fit the top foil with the metal mesh structure to the inner side of the bearing seat, with the metal mesh structure installed in the slot of the bearing seat. The foil structure of the top foil completely covers the arched structure of the bottom foil. At the same time, the metal mesh structure of the top foil squeezes and fixes the installation and fixing position of the bottom foil into the slot of the bearing seat.

[0013] S2: Assemble other bottom foils and top foils in sequence. When assembling other top foils, the left arc-shaped foil structure of the newly installed top foil presses and fixes the right arc-shaped foil structure of the installed top foil. The foil structure of the top foil covers the arched structures of all bottom foils, and the metal mesh structure of the top foil locks the installation and fixing position of the bottom foil into the slot of the bearing seat. Thus, the installation and fixing of all top foils and bottom foils on the bearing seat are completed.

[0014] S3: Install the force sensor into the force sensor mounting hole on the bearing seat through the threaded structure;

[0015] S4: Install the laser ranging probe and armored thermocouple probe into the laser ranging probe mounting hole and armored thermocouple probe mounting hole on the bearing seat.

[0016] In summary, the radial foil gas bearing provided by this multi-tile overlapped radial foil gas bearing and its assembly method has a simple structure and is easy to assemble and disassemble. The unique multi-tile overlap structure can pre-tighten the mating rotating shaft through the cooperation between the multi-tiles, thereby effectively improving the bearing capacity of the gas bearing. At the same time, the multi-tile structure is convenient for processing and assembly. If local damage occurs during later use, it can be partially replaced without replacing the entire bearing, effectively reducing costs and having very strong engineering application value. In addition, the bearing can provide effective load-bearing and vibration suppression at high speeds, and the operating status of the bearing during actual operation is monitored in real time through an intelligent monitoring system. It can effectively ensure the safety of the bearing-rotor system at high speeds and facilitate the subsequent analysis of test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a schematic structural diagram of a multi-tile overlapping radial foil gas bearing according to the present invention.

[0018] Figure 2 Schematic diagram of the top foil.

[0019] Figure 3 Schematic diagram of the bottom foil.

[0020] Figure 4 Schematic diagram of the bearing seat. DETAILED DESCRIPTION

[0021] The present invention will be described in further detail below with reference to the accompanying drawings. It should be understood that in the description of the present invention, the directions or positional relationships indicated by directional terms such as "upper" and "lower" and "top" and "bottom" are generally based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. Unless otherwise indicated, these directional terms do not indicate or imply that the devices or components referred to must have a specific direction or be constructed and operated in a specific direction, and therefore should not be construed as limiting the scope of protection of the present invention. The directional terms "inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0022] like Figure 1-4 As shown, a multi-tile overlapping radial foil gas bearing and an assembly method thereof, the radial foil gas bearing includes a bearing seat 1, multiple top foils 2 and a bottom foil 3; the top foil 2 includes an arc-shaped foil structure 21 and a metal wire mesh structure 22, the metal wire mesh structure 22 is formed by mechanically winding, stacking and pressing multiple stainless steel wires, the foil structure 21 includes a left arc-shaped foil structure and a right arc-shaped foil structure located on both sides of the metal wire mesh structure 22, and the foil structure 21 and the metal wire mesh structure 22 are fixedly connected by welding; the bottom foil 3 includes an installation fixing position 31 and an arch structure 32, the installation fixing position 31 is located at the end and is fixedly connected to the arch structure 32; a plurality of card slots 11 are distributed along the circumferential direction on the inner side of the bearing seat 1, the number of the card slots 11 is the same as the number of the top foil 2 and the bottom foil 3, and the metal wire mesh structure 22 and the installation fixing position 31 are installed in the card slots 11;

[0023] The outer side of the bearing seat 1 is evenly distributed along the circumference, with multiple force sensor mounting holes 12, laser ranging probe mounting holes 13, and armored thermocouple probe mounting holes 14. These holes are used to mount the force sensor 5, laser ranging probe 6, and armored thermocouple probe 7, respectively. These holes are located opposite and connected to the slot 11. The force sensor 5 monitors the bearing's load capacity; the laser ranging probe 6 monitors the bearing's takeoff status; and the armored thermal pad probe 7 monitors the bearing's real-time temperature.

[0024] The radial foil gas bearing is mounted on the rotating shaft 4, and the position where the top foil contacts the rotating shaft is coated with a wear-resistant coating.

[0025] In this embodiment, the circumferential arched structure 32 of the bottom foil 3 can be cut into multiple arched structures of varying widths. Furthermore, the arched structure 32 can be designed to have varying arched structure parameters as needed, thereby optimizing the stiffness distribution of the bottom foil and improving the structural damping and load-bearing capacity of the bearing.

[0026] In this embodiment, a method for assembling a multi-pad overlapping radial foil gas bearing includes the following steps:

[0027] S1: Fit the bottom foil 3 to the inner side of the bearing seat 1, and fit the installation and fixing position 31 of the bottom foil 3 to one side of the slot 11. Fit the top foil 2 with the metal mesh structure 22 to the inner side of the bearing seat 1, and fit the metal mesh structure 22 to the slot 11 of the bearing seat 1. The foil structure 21 of the top foil 2 completely covers the arched structure 32 of the bottom foil 3. At the same time, the metal mesh structure 22 of the top foil 2 squeezes and fixes the installation and fixing position 31 of the bottom foil 3 to the In the slot 11 of the bearing seat 1; the top foil 2 is shaped like a tile, and is divided into a left arc-shaped foil structure and a right arc-shaped foil structure at the metal mesh structure 22 of the top foil 2. During the actual operation of the bearing, after the left arc-shaped foil structure 21 of the top foil 2 is squeezed, the right arc-shaped foil structure 21 is tilted with the metal mesh structure 22 of the top foil 2 as the axis, and the gap between the right arc-shaped foil structure 21 and the rotor 4 is reduced, which is beneficial to the improvement of the bearing capacity;

[0028] S2: Assemble other bottom foils 3 and top foils 2 in sequence. When assembling other top foils 2, the left arc-shaped foil structure of the newly installed top foil 2 presses and fixes the right arc-shaped foil structure of the installed top foil 2. The foil structure 21 of the top foil 2 covers all the arched structures 32 of the bottom foils 3, and the metal mesh structure 22 of the top foil 2 locks the installation and fixing position 31 of the bottom foil 3 into the slot 11 of the bearing seat 1. Thus, the installation and fixing of all the top foils 2 and bottom foils 3 on the bearing seat 1 are completed.

[0029] After the radial foil gas bearing is installed, the top foil will extend toward the center of the circle because the arc-shaped foil structure has no effective radial constraints. After the rotating shaft that cooperates with the radial foil gas bearing is installed, the rotating shaft can effectively compress the arc-shaped foil structure of the top foil, thereby effectively pre-tightening the foil structure of the radial bearing on the rotating shaft. In actual operation, the rotating shaft and the arc-shaped foil structure of the top foil of the radial foil gas bearing are tightly fitted in the initial state. The pre-tightening effect of the radial bearing makes the gap between the radial bearing and the rotating shaft very small, which can effectively improve the bearing's load-bearing capacity. During the operation of the rotating shaft, after achieving high-speed rotation, the air film pressure generated on the top foil can effectively support the rotating shaft. At the same time, the top foil is affected by the reaction force and extends radially outward. The metal mesh structure is fitted with the bearing seat slot, and the rotating shaft and the top foil no longer contact each other, thus achieving the supporting and suspending effect of the radial bearing on the rotating shaft. Because the top foil of the radial bearing no longer contacts the shaft during high-speed operation, the wear life of the top foil is significantly improved. Furthermore, the unique arched structure of the bottom foil effectively provides sufficient rigidity and damping for the rotor during rotation, ensuring smooth operation at high speeds. As bearing speeds continue to increase at higher speeds, the need for greater load-bearing capacity and the suppression of strong vibrations arises. Because the top foil expands outward due to the reaction force, the welded wire mesh structure on the top foil is compressed. This wire mesh structure provides sufficient structural rigidity for the entire bearing, further improving the bearing's load-bearing capacity. Furthermore, the wire mesh structure acts as a dry friction metal damper, working together with the bottom foil to effectively suppress rotor vibration at high speeds and avoid the adverse consequences of rotor vibration. Furthermore, the ample gaps between the stainless steel wires of the wire mesh structure provide a natural cooling channel for the cooling gas during operation, effectively dissipating heat generated by bearing friction, ensuring the stability of the bearing-rotor system and extending bearing life.

[0030] The intelligent monitoring system includes a force sensor, a laser ranging probe and an armored thermocouple probe.

[0031] S3: Mount the force sensor 5 to the force sensor mounting hole 12 on the bearing seat 1 through the threaded structure; when the wire mesh structure 22 of the top foil is subjected to force, the force measuring unit of the force sensor 5 measures the force transmitted from the wire mesh structure 22 to the force measuring unit;

[0032] When bearings are under heavy load, the wire structure fits against the inside of the bearing seat slot and is squeezed. A force sensor installed inside the bearing seat slot can accurately and promptly measure the squeezing force on the wire structure, which represents the actual load borne by the bearing foil. Before use, the bearings undergo a limit load test to determine their limit load. By comparing the actual load during operation with the limit load, the intelligent monitoring system promptly issues a warning when the actual load reaches 80% of the limit load. At 90% of the limit load, the system triggers a shutdown command, effectively preventing bearing failure due to overload.

[0033] S4: Install the laser ranging probe 6 and the armored thermocouple probe 7 in the laser ranging probe mounting hole 13 and the armored thermocouple probe mounting hole 14 on the bearing seat. The laser ranging probe 6 is pre-embedded on one side of the bearing seat 1 along the axial direction, and the armored thermocouple probe 7 is pre-embedded on the other side along the axial direction. The laser ranging probe 6 can monitor the distance between the metal mesh structure of the top foil and the laser ranging probe in real time during the operation of the bearing. When the rotating shaft of the equipment is suspended by the bearing support, the rotating shaft and the top foil of the bearing are no longer in contact. The top foil is squeezed outward in the radial direction, and the distance between the metal mesh structure and the laser ranging probe is shortened. When the distance tested by multiple laser ranging probes evenly distributed along the circumference of the bearing seat reaches 1mm, the intelligent monitoring system can promptly prompt the bearing to take off, that is, there is no contact friction between the top foil of the bearing and the rotor. At this time, the rotating shaft is effectively suspended, and the bearing smoothly reaches normal working state. When the distance tested by the laser ranging probe 6 is 0, the bearing is under a large load, and the bottom foil 3 of the bearing can no longer provide sufficient supporting stiffness. The metal mesh structure 22 of the top foil 2 needs to continue to provide supporting stiffness to ensure that the bearing continues to work normally. At this time, the monitoring system prompts that it is necessary to pay special attention to the monitoring results of the force sensor to prevent the bearing from being subjected to a load exceeding the limit load.

[0034] Armored thermocouple probes 7 measure the temperature of the bearing's foil structure in real time. When the temperature measured by multiple armored thermocouple probes 7, evenly distributed around the circumference of the bearing seat 1, reaches 200°C, the intelligent monitoring system issues an alert. When the temperature reaches 250°C, a shutdown command is triggered, effectively preventing coating failure due to wear and overheating between the bearing and rotor. Simultaneously observing the monitoring results from the side-mounted device can determine whether the wear and overheating between the bearing and rotor is due to bearing overload, facilitating later analysis of the cause of the bearing failure.

[0035] Finally, it should be noted that various modifications and variations of the present invention may be made by those skilled in the art without departing from the spirit and scope of the present invention. Thus, the present invention is intended to include such modifications and variations as fall within the scope of the claims and their equivalents.

Claims

1. A multi-wall overlapping radial foil gas bearing, characterized in that: The radial foil gas bearing includes a bearing seat, a plurality of top foils and a bottom foil; the top foil includes an arc-shaped foil structure and a metal mesh structure, the foil structure includes a left arc-shaped foil structure and a right arc-shaped foil structure located on both sides of the metal mesh structure, and the foil structure and the metal mesh structure are fixedly connected; the bottom foil includes an installation fixing position and an arch structure, the installation fixing position is located at the end and is fixedly connected to the arch structure, and the foil structure of the top foil completely covers the arch structure of the bottom foil; a plurality of slots are distributed along the circumferential direction on the inner side of the bearing seat, the number of the slots is the same as the number of the top foil and the bottom foil, and the metal mesh structure and the installation fixing position are installed in the slots; The outer side of the bearing seat is evenly distributed along the circumference with a plurality of force sensor mounting holes, laser ranging probe mounting holes and armored thermocouple probe mounting holes. The force sensor mounting holes, laser ranging probe mounting holes and armored thermocouple probe mounting holes are used to install the force sensor, laser ranging probe and armored thermocouple probe respectively. The force sensor mounting holes, laser ranging probe mounting holes and armored thermocouple probe mounting holes are arranged opposite to the card slot and are connected to the card slot.

2. The multi-pad overlapping radial foil gas bearing according to claim 1, characterized in that: The position where the foil structure of the top foil contacts the rotating shaft is coated with a wear-resistant coating.

3. The multi-pad overlapping radial foil gas bearing according to claim 2, characterized in that: The metal wire mesh structure is formed by mechanically winding, laminating and pressing a plurality of stainless steel wires.

4. The multi-pad overlapping radial foil gas bearing according to claim 1, characterized in that: The foil structure is connected to the metal wire mesh structure by welding.

5. The multi-pad overlapping radial foil gas bearing according to claim 1, characterized in that: The arched structure of the bottom foil along the circumferential direction can be cut into a plurality of arched structures with different widths.

6. An assembly method for a multi-pad overlapping radial foil gas bearing according to any one of claims 1 to 5, characterized in that: The assembly method comprises the following steps: S1: Fit the bottom foil to the inner side of the bearing seat, with the installation and fixing position of the bottom foil fitting on one side of the slot. Fit the top foil with the metal mesh structure to the inner side of the bearing seat, with the metal mesh structure installed in the slot of the bearing seat. The foil structure of the top foil completely covers the arched structure of the bottom foil. At the same time, the metal mesh structure of the top foil squeezes and fixes the installation and fixing position of the bottom foil into the slot of the bearing seat. S2: Assemble other bottom foils and top foils in sequence. When assembling other top foils, the left arc-shaped foil structure of the newly installed top foil presses and fixes the right arc-shaped foil structure of the installed top foil. The foil structure of the top foil covers the arched structures of all bottom foils, and the metal mesh structure of the top foil locks the installation and fixing position of the bottom foil into the slot of the bearing seat. Thus, the installation and fixing of all top foils and bottom foils on the bearing seat are completed. S3: Install the force sensor into the force sensor mounting hole on the bearing seat through the threaded structure; S4: Install the laser ranging probe and armored thermocouple probe into the laser ranging probe mounting hole and armored thermocouple probe mounting hole on the bearing seat.

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