A foil radial bearing structure

Abstract

The utility model provides a kind of foil radial bearing structure, it is related to air bearing technical field, foil radial bearing structure, including bearing shell, sliding block, wave foil and top foil, the inner periphery of bearing shell is equipped with sliding slot, and sliding block is slidably equipped in sliding slot;Wave foil is equipped on sliding block, and top foil is equipped on wave foil, and sliding slot includes circular arc segment and top-up section, and circular arc segment is connected with top-up section, in the radial direction of bearing shell, and top-up section is located in the inside of the extension line of circular arc segment.The utility model discloses a kind of foil radial bearing structure, and sliding slot includes circular arc segment and top-up section, and circular arc segment is connected with top-up section, when sliding block slides to top-up section, sliding block lifts wave foil, wave foil lifts top foil, gas flow passage formed by foil and rotor is wedge-shaped, and the gas flow passage of wedge shape can change the gas film stiffness and damping of bearing, so it can effectively match different load, to improve the matching of bearing and load, enhance the stability of bearing.

Description

Technical Field

[0001] This utility model relates to the field of air bearing technology, and in particular to foil radial bearing structure. Background Technology

[0002] Foil hydrodynamic gas bearings are increasingly widely used in high-speed rotating machinery due to their oil-free operation, frictionless operation, and simple maintenance. Radial foil bearings are mainly used for radial support of high-speed rotors, supporting the rotor weight and external radial loads, thus achieving radial load bearing on the rotor.

[0003] However, the inner wall shape of current radial foil bearings is mainly a fixed shape such as a circle or multiple wedges. The shape of the bearing cannot be well matched with the load, which can easily affect the stability of the bearing under load.

[0004] In view of this, a new technical solution is needed to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a foil radial bearing structure with high shape-load matching and stable bearing performance. This solves the problem of poor bearing stability due to mismatch between bearing shape and load.

[0006] To achieve the above objectives, the present invention employs the following technical means:

[0007] This utility model provides a foil radial bearing structure, including a bearing housing, a slider, a corrugated foil, and a top foil. The inner circumferential surface of the bearing housing is provided with a groove, and the slider is slidably disposed in the groove. The corrugated foil is disposed on the slider, and the top foil is disposed on the corrugated foil. The groove includes an arc segment and a lifting segment, the arc segment and the lifting segment are connected, and in the radial direction of the bearing housing, the lifting segment is located inside the extension line of the arc segment.

[0008] Optionally, the lifting section is located at the tail end of the chute.

[0009] Optionally, the lifting section is arc-shaped.

[0010] Optionally, the bearing housing is provided with a top foil limiting groove, the folded edge section of the top foil is provided in the top foil fixing groove, and the arc section of the top foil is in contact with the corrugated foil.

[0011] Optionally, it also includes a fixing pin, which passes through the top foil and the bearing housing to fix the top foil into the top foil limiting groove.

[0012] Optionally, the bearing housing is provided with a corrugated foil limiting groove, and the folded edge section of the corrugated foil is fixed in the corrugated foil fixing groove.

[0013] Optionally, it also includes a drive ring, which has a groove, and the bearing housing has a boss that matches the groove.

[0014] Optionally, the drive ring includes multiple slots, which are equally spaced along the circumference of the bearing housing, and the bearing housing is provided with bosses that are adapted to the multiple slots.

[0015] Optionally, it also includes a connecting pin, which passes through the drive ring and the slider to fix the drive ring to the slider.

[0016] Optionally, the outer peripheral wall of the drive ring is provided with a plurality of drive teeth.

[0017] Compared with the prior art, this utility model brings the following technical effects:

[0018] The foil radial bearing structure of this utility model includes a groove comprising an arc segment and a lifting segment. The arc segment is connected to the lifting segment. When the slider slides to the lifting segment, the slider lifts the corrugated foil, and the corrugated foil lifts the top foil. The gas flow channel formed by the foil and the rotor is wedge-shaped. The wedge-shaped gas flow channel can change the gas film stiffness and damping of the bearing, thus effectively matching different loads, thereby improving the matching between the bearing and the load and enhancing the stability of the bearing. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the structure of a foil radial bearing according to some embodiments of the present invention is shown;

[0021] Figure 2 A cross-sectional view of a foil radial bearing according to some embodiments of the present invention is shown;

[0022] Figure 3 The following are schematic diagrams of the bearing housing structure according to some embodiments of the present invention;

[0023] Figure 4 The diagram shows a schematic representation of the slide groove according to some embodiments of the present invention;

[0024] Figure 5 This diagram shows a first state schematic of a foil radial bearing according to some embodiments of the present invention;

[0025] Figure 6 It shows Figure 5 A magnified view of part A;

[0026] Figure 7 This diagram illustrates a second state of the foil radial bearing according to some embodiments of the present invention;

[0027] Figure 8 It shows Figure 7 A magnified view of part B;

[0028] Figure 9 A schematic diagram of the assembly of the foil radial bearing and the rotor according to some embodiments of the present invention is shown.

[0029] Explanation of key component symbols:

[0030] 10-Radial bearing structure; 1-Bearing housing; 11-Boss; 12-Slide groove; 121-Circular arc segment; 122-Push-up section; 13-Top foil limiting groove; 14-Fixing pin hole; 15-Wave foil limiting slot; 2-Wave foil; 3-Top foil; 4-Slider; 5-Connecting pin; 6-Drive ring; 61-Drive tooth; 62-Slot; 7-Fixing pin; 20-Rotor. Detailed Implementation

[0031] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0033] Please see Figures 1-9 This utility model provides a foil radial bearing structure 10, including a bearing housing 1, a slider 4, a corrugated foil 2, and a top foil 3. The inner circumferential surface of the bearing housing 1 is provided with a groove 12, and the slider 4 is slidably disposed in the groove 12. The corrugated foil 2 is disposed on the slider 4, and the top foil 3 is disposed on the corrugated foil 2. The groove 12 includes an arc segment 121 and a lifting segment 122, which are connected. In the radial direction of the bearing housing 1, the lifting segment 122 is located inside the extension line of the arc segment 121.

[0034] The foil radial bearing structure 10 of this utility model has a sliding groove 12 including an arc segment 121 and a lifting segment 122. The arc segment 121 is connected to the lifting segment 122. When the slider 4 slides to the lifting segment 122, the slider 4 lifts the wave foil 2, and the wave foil 2 lifts the top foil 3. The gas flow channel formed by the foil and the rotor 20 is wedge-shaped. The wedge-shaped gas flow channel can change the gas film stiffness and damping of the bearing, which can effectively match different loads, thereby improving the matching between the bearing and the load and enhancing the stability of the bearing.

[0035] The rotor 20 is located inside the foil radial bearing structure 10. The rotor 20 and the inner side of the radial bearing structure 10 together form a gas flow channel. An air flotation layer is formed within the gas flow channel to ensure non-contact engagement between the rotor 20 and the foil radial bearing structure 10, thereby reducing wear between them. The extension line of the arc segment 121 is shown below. Figure 9 The X-ray segment is shown. The gas flow direction in the wedge-shaped gas channel is shown in the diagram. Figure 9 As shown by the arrow in the image.

[0036] The bearing housing 1 is used to support and mount the slider 4, the corrugated foil 2, and the top foil 3. The corrugated foil 2 provides elastic support for the top foil 3, which is positioned facing the rotor 20 for non-contact engagement with the rotor 20.

[0037] In one specific embodiment, the lifting section 122 is located at the tail of the chute 12.

[0038] The lifting section 122 is used to lift the slider 4 so that the slider 4 deviates inward from the extension line of the arc section 121. In this way, the slider 4 first slides on the arc section 121 and then slides on the lifting section 122, so that the distance between the slider 4 and the rotor 20 changes from far to near, which facilitates the formation of a wedge-shaped gas flow channel with the rotor 20.

[0039] In one specific embodiment, the lifting section 122 is arc-shaped.

[0040] The arc-shaped setting of the lifting section 122 allows the slider 4 to continue moving along the arc in the lifting section 122, so that the height of the corrugated foil 2 gradually increases and the height of the top foil 3 gradually increases synchronously. No protrusions are generated in the gas flow channel, and the air flotation layer between the foil radial bearing and the rotor 20 is stable and reliable.

[0041] In one specific embodiment, the bearing housing 1 is provided with a top foil 3 and a top foil limiting groove 13, the folded edge section of the top foil 3 is provided in the top foil 3 fixing groove, and the arc section 121 of the top foil 3 contacts the corrugated foil 2.

[0042] The top foil 3 has an arc segment 121 and a folded edge segment. The folded edge segment faces the bearing housing 1, and the arc segment 121 faces the corrugated foil 2. The top foil 3 is fixed by the top foil limiting groove 13, which limits the position of the top foil 3 and effectively reduces the mass and volume of the bearing housing 1, thereby reducing manufacturing costs.

[0043] In one specific embodiment, it also includes a fixing pin 7, which passes through the top foil 3 and the bearing housing 1 to fix the top foil 3 into the top foil limiting groove 13.

[0044] The bearing housing 1 is provided with a fixing pin hole 14, through which the pin passes to fix the top foil 3.

[0045] The top foil 3 and the bearing housing 1 are secured by the fixing pin 7 to prevent the top foil 3 from falling out of the top foil limiting groove 13, thereby further improving the fixation of the top foil 3. Furthermore, the top foil 3 can be removed from the bearing housing 1 when not in use, allowing for replacement and reducing maintenance costs.

[0046] In one specific embodiment, the bearing housing 1 is provided with a corrugated foil 2 and a corrugated foil 2 limiting groove 15, and the folded edge section of the corrugated foil 2 is fixed in the corrugated foil 2 fixing groove.

[0047] Correspondingly, the corrugated foil 2 is also disposed in the corrugated foil 2 limiting groove 15. In this way, the corrugated foil 2 is fixed by the corrugated foil 2 limiting groove 15, so that the corrugated foil 2 works stably and reliably. Furthermore, it effectively reduces the mass and volume of the bearing housing 1, thereby reducing manufacturing costs.

[0048] In one specific embodiment, it also includes a drive ring 6, which has a groove 62, and the bearing housing 1 has a boss 11 that matches the groove 62.

[0049] The boss 11 extends toward the drive ring 6. The drive ring 6 is fitted onto one end face of the bearing housing 1.

[0050] In this embodiment, the boss 11 is inserted into the slot 62 so that the drive ring 6 is fixed in its axial and inner diameter directions, and the drive ring 6 and the bearing housing 1 are fixed stably and reliably.

[0051] In one specific embodiment, the drive ring 6 includes a plurality of slots 62, which are equally spaced along the circumference of the bearing housing 1, and the bearing housing 1 is provided with bosses 11 that are adapted to the plurality of slots 62.

[0052] In this embodiment, the drive ring 6 is provided with three slots 62, and the bearing housing 1 is provided with three bosses 11. The three bosses 11 are inserted into the three slots 62 so that the three bosses 11 are subjected to force evenly, so as to prevent the bosses 11 from deforming due to excessive local force, thereby improving the stability of the connection between the drive ring 6 and the bearing housing 1.

[0053] In one specific embodiment, a connecting pin 5 is also included, which passes through the drive ring 6 and the slider 4 to fix the drive ring 6 to the slider 4.

[0054] The drive ring 6 is connected to the slider 4 by the connecting pin 5. When the drive ring 6 rotates, it drives the slider 4 to slide within the groove 12.

[0055] It should be noted that the groove 62 of the drive ring 6 is slightly longer than the boss 11 in length, so that when the drive ring 6 drives the slide 12 to move, the engagement between the boss 11 and the groove 62 will not interfere.

[0056] In one specific embodiment, a plurality of drive teeth 61 are provided on the outer peripheral wall of the drive ring 6.

[0057] The drive gear 61 is used to cooperate with the drive gear of the drive component to drive the entire drive ring 6 to rotate.

[0058] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom still fall within the protection scope of this invention.

Claims

1. A foil radial bearing structure, characterized in that, The bearing housing includes a bearing housing, a slider, a corrugated foil, and a top foil. The inner circumferential surface of the bearing housing is provided with a groove, and the slider is slidably disposed in the groove. The corrugated foil is disposed on the slider, and the top foil is disposed on the corrugated foil. The groove includes an arc segment and a lifting segment, the arc segment and the lifting segment are connected, and the lifting segment is located inside the extension line of the arc segment in the radial direction of the bearing housing.

2. The foil radial bearing structure according to claim 1, characterized in that, The lifting section is located at the tail end of the chute.

3. The foil radial bearing structure according to claim 1, characterized in that, The lifting section is arc-shaped.

4. The foil radial bearing structure according to claim 1, characterized in that, The bearing housing is provided with a top foil limiting groove, the folded edge section of the top foil is located in the top foil fixing groove, and the arc section of the top foil is in contact with the corrugated foil.

5. The foil radial bearing structure according to claim 4, characterized in that, It also includes a fixing pin, which passes through the top foil and the bearing housing to fix the top foil into the top foil limiting groove.

6. The foil radial bearing structure according to claim 1, characterized in that, The bearing housing is provided with a corrugated foil limiting groove, and the folded edge of the corrugated foil is fixed in the corrugated foil fixing groove.

7. The foil radial bearing structure according to claim 1, characterized in that, It also includes a drive ring, which has a groove, and the bearing housing has a boss that matches the groove.

8. The foil radial bearing structure according to claim 7, characterized in that, The drive ring includes multiple slots, which are equally spaced along the circumference of the bearing housing. The bearing housing is provided with bosses that are adapted to the multiple slots.

9. The foil radial bearing structure according to claim 7, characterized in that, It also includes a connecting pin, which passes through the drive ring and the slider to fix the drive ring to the slider.

10. The foil radial bearing structure according to claim 7, characterized in that, The outer peripheral wall of the drive ring is provided with multiple drive teeth.

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