A high-load water-lubricated bearing

Abstract

The present invention discloses a high-load, water-lubricated bearing comprising a rigid outer ring, a rubber inner ring disposed within the inner cavity of the rigid outer ring, a plurality of arched members fixedly connected to the inner cavity of the rigid outer ring, the arched feet of the arched members being connected to the inner wall of the rigid outer ring, and the rubber inner ring being at least filled between adjacent arched members. The high-load, water-lubricated bearing provided by the present invention has excellent impact resistance and deformation resistance, and can be used in equipment in deep-sea areas. During use, it can quickly decompose, transfer, and absorb local impact forces and has excellent stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of water-lubricated bearings, and in particular relates to a high-load water-lubricated bearing. Background Art

[0002] Water-lubricated bearings rely on fluid dynamic pressure to form a water film. This involves the high-speed relative motion between the shaft and bearing, which draws water between the friction surfaces into the gap, forming a high-pressure water film. This separates the two friction surfaces and reduces bearing friction and wear. The key and most challenging aspects of water-lubricated bearing construction lie primarily in the design of the bearing bushing (comprising the inner bushing and the outer ring of the bushing). The most commonly used bushing structure features an even number of equally spaced axial grooves cut into the inner side of the bushing. Three types of slatted structures are used: concave, flat, and convex.

[0003] For water-lubricated bearings with high loads (generally no less than 0.5 MPa), the sleeves currently primarily utilize a rubber inner layer primarily composed of nitrile rubber, which is bonded to the inner wall of the outer ring. For example, the water-lubricated bearing disclosed in CN112228449A comprises a tubular outer shell and a tubular inner liner secured to the inner wall of the outer shell. The inner liner is formed by vulcanizing a polymer rubber alloy elastomer and contains at least one magnetorheological elastomer embedded within it.

[0004] However, existing water-lubricated bearings of this type cannot meet the application requirements of deep-sea (water depth of not less than 30m), especially in deep-sea areas where the pressure is high, and water-lubricated bearings have higher load-bearing performance requirements, especially impact resistance and deformation resistance. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-load water-lubricated bearing, which solves the problem that existing ordinary water-lubricated bearings cannot be used in deep sea.

[0006] The present invention adopts the following technical solutions.

[0007] A high-load water-lubricated bearing comprises a rigid outer ring, a rubber inner ring is arranged in the inner cavity of the rigid outer ring, a plurality of arched parts are fixedly connected to the rigid outer ring, and the arch feet of the arched parts are connected to the inner wall of the rigid outer ring, and the rubber inner ring is at least filled between adjacent arched parts.

[0008] In order to further improve the impact resistance and deformation resistance of the water-lubricated bearing, the arch member includes a main arch member and a first secondary arch member. The first secondary arch member is arranged in the inner cavity of the main arch member, and there is a first space for accommodating rubber between the outer wall of the first secondary arch member and the inner wall of the main arch member. The first secondary arch member is fixedly connected to the inner wall of the rigid outer ring.

[0009] In order to further improve the impact resistance and deformation resistance of the water-lubricated bearing, the inner cavity of the first secondary arch is also provided with a second secondary arch, and a second space for accommodating rubber is also provided between the outer wall of the second secondary arch and the inner wall of the first secondary arch. The second secondary arch is fixedly connected to the inner wall of the rigid outer ring.

[0010] In order to further improve the impact resistance and deformation resistance of the water-lubricated bearing, the main arch, the first secondary arch and the second secondary arch are all provided with a plurality of through holes, and the rubber inner ring is filled between adjacent arches, in the first space, the second space and the through holes.

[0011] As a preferred solution, the arch tops of all the main arch members are located on the same circumferential surface, and the main arch members and the rigid outer ring are substantially the same length.

[0012] Furthermore, the inner cavity of the arched part is filled with carbon fiber filaments, and the filling body formed by the carbon fiber filaments and the rubber serves as a part of the rubber inner ring.

[0013] As a preferred solution, an axially arranged strip groove is provided on the inner wall of the rigid outer ring, and the arch feet of the arch member are fused or welded in the corresponding strip groove.

[0014] In order to effectively remove particles in the water film, the strip groove on the rubber inner ring is located between two adjacent arched parts.

[0015] Furthermore, both ends of the rigid outer ring and the arched member are provided with detachable sealing plates, and the inner diameter of the sealing plates is equal to the radius corresponding to the circumferential surface.

[0016] As a preferred solution, the wall thickness of the main arch and the secondary arch are both 2~4mm.

[0017] Beneficial effects: The high-load water-lubricated bearing provided by the present invention has excellent impact resistance and deformation resistance, can be used for equipment in deep-sea areas, and can quickly decompose, transfer and absorb local impact forces during use, and has good stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a main structural diagram of the high-load water-lubricated bearing in Example 1;

[0019] Figure 2 for Figure 1 Cross-sectional structural diagram;

[0020] Figure 3 1 is an exploded view of the high-load water-lubricated bearing in Example 1;

[0021] Figure 4 : is a radial cross-sectional view of the high-load water-lubricated bearing in Example 1 (before the rubber layer is filled);

[0022] Figure 5 This is a partial schematic diagram of the rigid outer ring after the fiber bundle is wound on it in Example 1. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1

[0024] Combine Figures 1 to 4 As shown, a high-load water-lubricated bearing includes a rigid outer ring 1, a rubber inner ring 2 is arranged in the inner cavity of the rigid outer ring 1, a plurality of arch members 3 are fixedly connected to the rigid outer ring 1, and the arch feet of the arch members 3 are connected to the inner wall of the rigid outer ring 1, the rubber inner ring 2 is at least filled between adjacent arch members 3, the arch tops of the main arch members 30 are located on the same circumferential surface 8, and the main arch members 30 are the same length as the rigid outer ring 1, and the wall thickness of the main arch members 30 and the secondary arch members are both 3 mm. The arch 3 includes a main arch 30 and a first secondary arch 31. The first secondary arch 31 is disposed within the inner cavity of the main arch 30, with a first space 11 for accommodating rubber defined between its outer wall and the inner wall of the main arch 30. The first secondary arch 31 is fixedly connected to the inner wall of the rigid outer ring 1. A second secondary arch 32 is also disposed within the inner cavity of the first secondary arch 31, with a second space 12 for accommodating rubber defined between its outer wall and the inner wall of the first secondary arch 31. The second secondary arch 32 is fixedly connected to the inner wall of the rigid outer ring 1. Several through-holes 4 are provided in the main arch 30, the first secondary arch 31, and the second secondary arch 32. The rubber inner ring 2 is filled between adjacent arches 3, in the first space 11, the second space 12, and the through-holes 4.

[0025] In this embodiment, the inner cavity of the arch member 3 is filled with carbon fiber filaments, which are axially wound around the arch member 3. The filler formed by the carbon fiber filaments and the rubber serves as part of the rubber inner ring 2. Axially arranged strip grooves 5 are provided on the inner wall of the rigid outer ring 1. The arch feet of the arch member 3 are welded into the corresponding strip grooves 5. The rigid outer ring 1 and the arch member 3 are both made of bronze material that meets the requirements of composite corrosion resistance. The strip groove 6 on the rubber inner ring 2 is located between two adjacent arch members 3 (serving to smoothly guide particulate matter in the water within the bearing without affecting the bearing's load-bearing performance, effectively removing particulate matter from the water film). A removable sealing plate is bolted to both ends of the rigid outer ring 1 and the arch member 3. The inner diameter of the sealing plate is equal to the radius corresponding to the circumferential surface 8.

[0026] The preparation method of the high-load water-lubricated bearing in this embodiment is as follows: the rigid outer ring 1 and the arch member 3 are cast according to the design requirements; the rubber positioning blocks 14 are respectively pasted on the inner wall and the outer wall of the main arch member 30, the first secondary arch member 31 and the second secondary arch member 32, the curvature of the rubber positioning blocks 14 is consistent with the curvature of the corresponding arch member, and the thickness of the rubber positioning blocks 14 is less than the gap width of the adjacent arch members, and then the carbon fiber tows 13 are axially wound on the arch member, and the spacing between adjacent carbon fiber tows 13 is not more than 5mm. The state at this time is as follows Figure 5 Next, the arched member wrapped with carbon fiber tow 13 is mounted in the corresponding strip groove 5, and then the arched member is welded to the rigid outer ring 1. The structure at this time is as shown Figure 4 As shown; finally, a layer of strong adhesive is applied to the inner wall of the rigid outer ring 1 equipped with the arch and the wall of the arch (the outer wall of the rigid outer ring 1 is coated and immersed in the adhesive fluid and then taken out), and then it is mounted on the injection mold (mold core), and the prepared rubber material is injected into the rigid outer ring 1 and vulcanized (in this process, the rubber positioning block 14 will be remelted together with the rubber material), and the mold is removed and the sealing plate is installed to obtain a high-load water-lubricated bearing.

[0027] In this embodiment, on the one hand, the main arch member 30, the first secondary arch member 31 and the second secondary arch member 32 are used to form an arch-in-arch structure fixedly connected to the rigid outer ring 1, and then the fiber bundles 13 and rubber filled between the arch members are used to form a filling body as a part of the rubber inner ring, so that the rubber inner ring 2 has very high tensile and compressive properties, and is particularly capable of quickly and effectively dispersing and transferring local impact forces from the inside of the rubber inner ring 2.

[0028] Taking the DN250mm high-load water-lubricated bearing in this embodiment as an example (its main parameters are: rigid outer ring 1 wall thickness 15mm, rubber inner ring 2 total thickness 20mm, carbon fiber tow 13 diameter 1.5mm), even if the radial tension is increased to 30Mpa (tension direction is as follows Figure 2As shown by the linear arrows in the center, a total of five stress points are set up. The tension cable required for the test is pre-set on the second secondary arch 32 during the manufacturing process. The rubber inner ring 2 is also firmly connected to the rigid outer ring 1 and does not fall off / peel off. However, for conventional water-lubricated bearings of the same specifications (the rubber inner ring is directly bonded to the inside of the rigid outer ring), the rubber inner ring will be peeled off when a tensile force of about 8Mpa is applied. Analysis shows that: for conventional water-lubricated bearings, the peeling / falling off of the rubber inner ring is mainly prevented by the bonding force of the adhesive. In this application, the peeling / falling off of the rubber inner ring is prevented by the cooperation of the main arch 30, the first secondary arch 31, the second secondary arch 32, the fiber bundle, the rigid outer ring and the rubber filling layer. The peeling resistance of the two is completely on a different order of magnitude, and both have quite excellent radial tensile properties. Taking the aforementioned high-load water-lubricated bearing as an example, the experimental shaft (outer diameter 150 mm) is installed on the vibration equipment, the water-lubricated bearing is mounted on the experimental shaft, and the experimental shaft is controlled to intermittently hit the rubber inner ring 2 at a frequency of once per second (the experimental shaft will hit the rubber inner ring 2 during vibration, and the impact direction is as follows Figure 2 As indicated by the hollow arrow, with an amplitude of 5mm, the maximum downward pressure on the inner surface of the rubber inner ring during the impact was 1-1.5mm. The results show that the rubber inner ring 2 remained functional (sealing performance met requirements) after 10,000 intermittent impacts. In contrast, a conventional water-lubricated bearing of the same specifications exhibited significant deformation and wear on the rubber inner ring after approximately 7,000 intermittent impacts, failing to meet service requirements. The rubber inner ring also experienced multiple detachments at the bonding point between the rubber inner ring and the rigid outer ring. Analysis indicates that conventional water-lubricated bearings primarily rely on the rubber inner ring and adhesive layer to withstand impacts. In contrast, the present solution relies on the coordinated efforts of the main arch 30, first secondary arch 31, second secondary arch 32, fiber bundle, rigid outer ring, and rubber filling layer to resist impacts. In particular, the arch quickly disperses the impact force to the filling layer and rigid outer ring, significantly differentiating the impact resistance of the two bearings, resulting in superior radial impact resistance.

Claims

1. A high-load water-lubricated bearing, comprising a rigid outer ring (1), a rubber inner ring (2) arranged in the inner cavity of the rigid outer ring (1), characterized in that: A plurality of arched members (3) are fixedly connected to the rigid outer ring (1), and the arch feet of the arched members (3) are connected to the inner wall of the rigid outer ring (1), and the rubber inner ring (2) is at least filled between the adjacent arched members (3); the arched members (3) include a main arched member (30) and a first secondary arched member (31), the first secondary arched member (31) is arranged in the inner cavity of the main arched member (30), and a first space (11) for accommodating rubber is provided between the outer wall of the first secondary arched member (31) and the inner wall of the main arched member (30), and the first secondary arched member (31) is fixedly connected to the inner wall of the rigid outer ring (1); a second secondary arched member (32) is also provided in the inner cavity of the first secondary arched member (31), and a first space (11) for accommodating rubber is provided between the outer wall of the second secondary arched member (32) and the inner wall of the first secondary arched member (31). The second space (12) of the rubber, the second secondary arch (32) is fixedly connected to the inner wall of the rigid outer ring (1); the main arch (30), the first secondary arch (31) and the second secondary arch (32) are all provided with a plurality of through holes (4), and the rubber inner ring (2) is filled between adjacent arch members (3), the first space (11), the second space (12) and the through holes (4); the inner cavity of the arch member (3) is filled with carbon fiber filaments, and the carbon fiber bundle (13) is axially wound on the arch member, and the filling body formed by the carbon fiber filaments and the rubber serves as a part of the rubber inner ring (2); an axially arranged strip groove (5) is provided on the inner wall of the rigid outer ring (1), and the arch foot of the arch member (3) is fused or welded in the corresponding strip groove (5).

2. The high-load water-lubricated bearing according to claim 1, characterized in that: The arch tops of all the main arch members (30) are located on the same circumferential surface (8), and the main arch members (30) and the rigid outer ring (1) are substantially equal in length.

3. The high-load water-lubricated bearing according to claim 2, characterized in that: The strip-shaped groove (6) on the rubber inner ring (2) is located between two adjacent arched parts (3).

4. The high-load water-lubricated bearing according to claim 3, characterized in that: The rigid outer ring (1) and the arched member (3) are provided with detachable sealing plates at both ends, and the inner diameter of the sealing plates is equal to the radius corresponding to the circumferential surface (8).

5. The high-load water-lubricated bearing according to claim 4, characterized in that: The wall thickness of the main arch member (30) and the auxiliary arch member is 2-4 mm.

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